CN111936097B - Pants-type disposable diaper - Google Patents

Abstract

A pants-type disposable diaper provided with a front side belt part (21), a rear side belt part (22), and an absorbent core (11), wherein: a base region (21s) and a high pressure region (30s) are provided; a high-pressure region (30s) extends circumferentially around the front side belt part (21) and the rear side belt part (22), the high-pressure region including a stretchable film (30) between the skin side nonwoven fabric sheets (213, 223) and the non-skin side nonwoven fabric sheets (214, 224), the high-pressure region including a ventilation part in which air permeability is higher than in a portion where the stretchable film (30) is located, the high-pressure region not overlapping the absorbent core (11) in the front-rear direction in at least one of the front side belt part (21) and the rear side belt part (22).

Description

Shorts type disposable diaper

technical field

The present invention relates to a pant-type disposable diaper.

Background technique

As a first example of the background art, Patent Document 1 describes a pant-type disposable diaper in which both side edge parts of the abdominal part and both side edge parts of the back part are joined to each other. The back part is provided with a first waist elastic member and a second waist elastic member which overlap with auxiliary waist elastic members arranged in parallel in the width direction (left-right direction) of the diaper. The first waist elastic member and the second waist elastic member are configured such that the regions where they intersect each other are in contact with the wearer's greater trochanters when the diaper is worn.

Patent Document 2 discloses that a high wearing pressure area is formed by providing another stretchable sheet in addition to the two sheets of the outer covering member of the pants-type disposable diaper. The high wearing pressure region is configured in contact with the region from the wearer's ilium to the wearer's anterior superior iliac spine.

As in Patent Documents 1 and 2, partially increasing the degree of close contact in the ventral portion and the back portion (front and rear belt portions) of the diaper can improve the fit of the diaper and suppress slippage.

As a second example of the background art, Patent Document 1 discloses a pant-type disposable diaper in which both side edge portions of the abdominal portion and both side edge portions of the back portion are joined to each other. The back part of the diaper in patent document 1 is provided with the 1st waist elastic member and the 2nd waist elastic member. The first waist elastic member and the second waist elastic member are configured such that the regions where they intersect each other are in contact with the greater trochanter of the wearer. Therefore, even if the diaper does not include the leg elastic members, slippage does not occur, and leakage can be prevented.

As a third example of the background art, Patent Document 2 discloses a pant-type disposable diaper including an absorptive main body and an outer covering member that fixes the absorptive main body. The outer cover member of the diaper in Patent Document 2 has a structure in which two sheets are overlapped with each other, and has a high wearing pressure region formed by providing another stretchable sheet in addition to the two sheets. The high wearing pressure areas can effectively prevent the diaper from slipping during wear by contacting the wearer's area from her ilium to her anterior superior iliac spine.

prior art literature

Patent Literature

Patent Document 1: Japanese Patent No. 5107760

Patent Document 2: Japanese Patent No. 5020362

SUMMARY OF THE INVENTION

Invention to solve problem

At least one of the following first and second problems is a problem to be solved by the present invention.

The first problem is that all the elastic members in Patent Document 1 are linear (string-shaped) members. To this end, the portion where the linear elastic member is provided is locally in close contact with the wearer and leaves a trace of the elastic member (band-shaped trace) on the wearer's skin.

If the high wearing pressure region is formed by the stretchable sheet as in Patent Document 2, the elastic member (stretchable member) is less likely to leave marks. A stretchable film is an example of a stretchable sheet, but the stretchable film has poor air permeability. If the stretchable film is arranged without gaps in the high wearing pressure region as in Patent Document 2, the air permeability is low in the high wearing pressure region. In addition, in Patent Document 2, the stretchable film is exposed on the wearer's skin side. For this reason, the stretchable film easily comes into contact with the wearer's skin without gaps, and the breathability is even lower.

The present invention has been made in view of the conventional problems such as those described above, and an object of the present invention is to provide a pant-type disposable diaper which improves the degree of close contact of the parts in the front side belt portion and the rear side belt portion while suppressing the Formation of stretchable member marks and reduction in air permeability.

The second problem is that the first waist elastic member of the diaper in Patent Document 1 extends from the edge portion of the leg opening to the edge portion of the waist opening. In other words, the position of the one-side end of the first waist elastic member is at the leg opening, and the first waist elastic member contracts in such a way that the leg opening is expanded. For this reason, it is not easy for the first waist elastic member to provide a sufficient contraction force to support the movement (muscle force) of the wearer.

Moreover, the 2nd waist elastic member is extended from the side edge part of a back part toward the center part located in the crotch part side of a back part. In other words, the second waist elastic member is located at a portion in contact with the gluteus maximus of the wearer, where the muscles and the skin greatly expand and contract due to the movement of the wearer. For this reason, when the wearer moves, friction between the wearer and the diaper is likely to occur and the comfort of the diaper is reduced.

The present invention has been accomplished in view of the conventional problems such as those described above, and an object of the present invention is to provide a pant-type disposable diaper that supports the movement of the wearer while being comfortable.

The third problem is that if the diaper wearer or caregiver cannot identify the location of the high wearing pressure area (high pressure area), it is difficult to adjust the diaper in such a way that the high wearing pressure area is located in the proper position for the wearer wearing position. Therefore, the effect of the high wearing pressure area may not be obtained. On the other hand, the comfort of the diaper may be reduced if areas of high wearing pressure are located in areas where contraction is not desired (eg, the lower abdominal area and the raised areas of the buttocks).

The present invention has been made in view of the conventional problems such as those described above, and an object of the present invention is to enable a pant-type disposable diaper having a high pressure region to be worn at an appropriate position of the wearer.

solution to the problem

The main aspect of the present invention for solving the first problem is a pant-type disposable diaper having an up-down direction, a left-right direction, and a front-rear direction that intersect with each other,

The shorts-type disposable diaper includes:

front side belt;

rear side straps; and

an absorbent body comprising an absorbent core,

The front side belt portion and the rear side belt portion form a waist opening at the upper end of the pant-type disposable diaper,

The front-side belt portion and the rear-side belt portion each include a skin-side non-woven fabric sheet, a non-skin-side non-woven fabric sheet, and a stretchable member,

The non-woven sheet on the skin side is at the position closest to the skin side,

The non-woven sheet on the non-skin side is at the position closest to the non-skin side,

The elastic member expands and contracts in the left-right direction,

The front side belt portion and the rear side belt portion each have a stretch region, a base region and a high pressure region, the stretch region being a region extending along the edge of the waist opening,

The base region is a region adjacent to the lower side of the expansion-contraction region at the center of the front-side belt portion in the left-right direction,

The high pressure area is arranged below the telescopic area,

The magnitude of the force required to extend the unit width portion of the high pressure region per unit length in the left-right direction is greater than the force required to extend the unit width portion of the base region per unit length in the left-right direction the size of,

the high pressure region extends circumferentially around the front and rear belt portions,

the high pressure area includes a stretchable membrane between the skin-side nonwoven sheet and the non-skin-side nonwoven sheet,

the high-pressure region includes a vent in which the air permeability is higher than in the portion where the stretchable film is located,

In at least one of the front-side belt portion and the back-side belt portion, the high pressure region does not overlap the absorptive core in the front-rear direction.

The main aspect of the present invention for solving the second problem is a pant-type disposable diaper having an up-down direction, a left-right direction, and a front-rear direction crossing each other, the pant-type disposable diaper comprising: a front side belt portion; a side strap portion; and a pair of locking portions in which both side portions in the left-right direction of the front-side strap portion are locked to the left-right direction of the rear-side strap portion both sides of the belt, the rear belt portion has a low pressure area and a high pressure area, and the low pressure area and the high pressure area are stretchable in the left-right direction, so that the The magnitude of the force required to extend the unit width portion in the up-down direction by a unit length in the left-right direction is larger than that required to extend the unit width portion in the up-down direction of the low pressure region by a unit length in the left-right direction The magnitude of the force required that the high-pressure region continuously extends in the left-right direction between the pair of locking portions, compared to in the central portion of the high-pressure region in the left-right direction , the length in the up-down direction of the high-pressure region is longer in the both ends of the high-pressure region in the left-right direction, and is longer than the central portion in the left-right direction of the high-pressure region The lower end of the high-pressure region is located at a lower position in both end portions in the left-right direction than in the middle, and in the center portion in the left-right direction of the rear belt portion, the low A pressure area is configured adjacent to the underside of the high pressure area.

The main aspect of the present invention for solving the third problem is a pant-type disposable diaper having an up-down direction, a left-right direction, and a front-rear direction crossing each other, the pants-type disposable diaper comprising: a belt portion; and an absorbent The main body, the belt portion has a low-pressure area and a high-pressure area located below a stretch area extending along the edge of the waist opening, the low-pressure area and the high-pressure area The regions are adjacent to each other, the low-pressure region and the high-pressure region have stretchability in the left-right direction, and a unit width portion in the vertical direction of the high-pressure region is elongated in the left-right direction The magnitude of the force required per unit length is greater than the magnitude of the force required to extend the unit width of the portion of the low pressure area in the up-down direction per unit length in the left-right direction, when viewed from the non-skin side and the skin side When at least one of them observes the belt portion, at least a part of the high-pressure area has a different color from the low-pressure area.

Other features of the present invention will become apparent by reading the description of this specification with reference to the accompanying drawings.

effect of invention

In order to solve the first problem, the effect of the present invention is to provide a pant-type disposable diaper which improves the degree of close contact in the portions of the front side belt portion and the rear side belt portion, while also suppressing the formation of stretchable member marks and breathability Sexual reduction.

In order to solve the second problem, the effect of the present invention is to provide a pant-type disposable diaper that supports the movement of the wearer while being comfortable.

In order to solve the third problem, the effect of the present invention is to enable a pant-type disposable diaper having a high pressure area to be worn at an appropriate position of the wearer.

Description of drawings

FIG. 1 is a schematic perspective view of the underpants-type disposable diaper 1 .

Fig. 2 is a schematic plan view of the diaper 1 in an unfolded and extended state.

FIG. 3 is a schematic cross-sectional view taken along line I-I in FIG. 2 .

4A to 4C are conceptual diagrams of the wearing state of the diaper 1 .

5A and 5B are schematic cross-sectional views of the ventral exterior body 21 and the back exterior body 22 .

FIG. 6A is an explanatory diagram of the high-pressure region 30s, and FIG. 6B is an explanatory diagram of the ventilation portion 33 and the welded portion 40 .

7A to 7C are explanatory diagrams of the high pressure region 30s according to the modification.

FIG. 8 is a schematic perspective view of the underpants-type disposable diaper 300 .

Figure 9 is a schematic plan view of the diaper 300 in a deployed and extended state.

FIG. 10 is a schematic cross-sectional view taken along line I-I in FIG. 9 .

FIG. 11A is a diagram showing an example of the bonding portion 350 , and FIG. 11B is a schematic cross-sectional view of the front-side belt portion 321 and the rear-side belt portion 322 .

FIG. 12 is a schematic plan view of the rear side strap portion 322 .

FIG. 13 is a schematic plan view of the front side belt portion 321 .

14A and 14B are explanatory diagrams of the gluteus medius 60 .

FIG. 15 is a schematic perspective view of the underpants-type disposable diaper 500 .

Figure 16 is a schematic plan view of the diaper 500 in a deployed and extended state.

FIG. 17 is a schematic cross-sectional view taken along line I-I in FIG. 16 .

18A is a diagram showing an example of the joint portion 530 in the front side belt portion 521 and the rear side belt portion 522 , and FIG. 18B is a schematic cross-sectional view of the front side belt portion 521 and the rear side belt portion 522 .

FIG. 19 is a schematic plan view of the front side belt portion 521 .

FIG. 20 is a schematic plan view of the rear side strap portion 522 .

FIG. 21 is a table showing experimental results regarding the visibility of the high pressure region 560 .

FIG. 22 is an explanatory diagram of the bonding portion 530 formed in the stretchable film 565. FIG.

Detailed ways

At least the following matters will become clear from the description of this specification and the accompanying drawings.

A pant-type disposable diaper having an up-down direction, a left-right direction, and a front-rear direction crossing each other, the pants-type disposable diaper comprising: a front side belt portion; a rear side belt portion; and an absorbent body including an absorbent body a core, the front and back tapes form a waist opening at the upper end of the pant-type disposable diaper, and both the front and back tapes include a skin-side nonwoven fabric A sheet, a non-skin-side non-woven fabric sheet, and a stretchable member, the non-skin-side non-woven fabric sheet being the most skin-side position, the non-skin-side non-woven fabric sheet being the most non-skin-side position, the The stretchable member expands and contracts in the left-right direction, the front side belt portion and the rear side belt portion each have a stretchable region, a base region, and a high-pressure region, the stretchable region extending along the edge of the waist opening The base area is an area adjacent to the lower side of the expansion-contraction area in the center of the front-side belt portion in the left-right direction, and the high-pressure area is provided below the expansion-contraction area, so that the The magnitude of the force required to extend the unit width portion of the high pressure region per unit length in the left-right direction is greater than the magnitude of the force required to extend the unit width portion of the base region per unit length in the left-right direction, The high pressure region extends circumferentially around the front and rear belt portions, the high pressure region including between the skin side nonwoven sheet and the non-skin side nonwoven sheet A stretchable film in between, the high-pressure region includes a vent in which the air permeability is higher than in the portion where the stretchable film is located, in the front side belt portion and In at least one of the back side belt portions, the high pressure region does not overlap the absorptive core in the front-rear direction.

According to this pant-type disposable diaper, the degree of close contact in the portions of the front side belt portion and the rear side belt portion is increased, and displacement during use can be suppressed. In addition, since the high-pressure region has the stretchable film and the ventilation portion, the formation of stretchable member traces and the decrease in air permeability can be suppressed. Furthermore, since the stretchable film is located between the skin-side nonwoven sheet and the non-skin-side nonwoven sheet, damage to the stretchable film can be suppressed, and the plane direction between the diaper and the wearer's skin can be ensured. Breathability.

In this pant-type disposable diaper, the stretchable member is a breathable sheet-like member.

According to this pant-type disposable diaper, the front side belt portion and the rear side belt portion are in close ground-surface contact with the wearer, so that the formation of stretchable member traces can be suppressed and breathability can be ensured.

In such a pants-type disposable diaper, the stretchable member is a stretchable nonwoven fabric sheet, and the stretchable nonwoven fabric sheet is arranged on the skin-side nonwoven fabric sheet and the non-skin-side nonwoven fabric position between sheets, and the stretchable nonwoven sheet is positioned on the skin side with respect to the stretchable film.

According to this shorts-type disposable diaper, a space (ventilation passage) is easily formed between the diaper and the wearer's skin, and the air permeability in the plane direction is ensured.

In such a pant-type disposable diaper, the stretchable member is a stretchable nonwoven fabric sheet, and in the stretchable region, a plurality of linear elastic members are arranged side by side at intervals in the vertical direction, and the plurality of The linear elastic member expands and contracts in the left-right direction, and extends from the upper end of the high-pressure region to the upper end of the front-side belt portion at the center of the front-side belt portion in the left-right direction. The length in the up-down direction is larger than the length in the up-down direction of the high pressure region.

According to this shorts-type disposable diaper, the high-pressure area is less likely to come into contact with the wearer's navel area, which is prone to sweating, so that steam in the diaper can be reduced.

In such a pant-type disposable diaper, in the high pressure region, the plurality of stretchable films long in the left-right direction are arranged side by side at intervals in the up-down direction, and in the up-down direction A portion between the adjacent stretchable films serves as the ventilation portion.

According to this underpants-type disposable diaper, it is possible to suppress a decrease in air permeability in the high pressure region.

In such a pant-type disposable diaper, in the high pressure region, the area of the portion where the stretchable film is located is larger than the ventilation portion between the stretchable films adjacent in the vertical direction. area.

According to this shorts-type disposable diaper, it is possible to suppress the decrease in the air permeability of the high-pressure region, improve the degree of close contact in the high-pressure region, and suppress the displacement of the diaper when worn.

In such a pant-type disposable diaper, compared with the central portion in the left-right direction of the front-side belt portion and the rear-side belt portion, the area of the ventilation portion is divided by the high The obtained value of the area of the pressure region is larger in the side portions in the left-right direction of the front-side belt portion and the rear-side belt portion.

According to this shorts-type disposable diaper, the ratio of the ventilation portion in the high-pressure region is high in the lateral portion in the left-right direction where there is a large movement of the wearer (movement of the buttocks and legs). To this end, it is possible to prevent obstruction of the wearer's movement, while also improving breathability in high pressure areas. On the other hand, the center part in the left-right direction is firmly in close contact with the region where the wearer's movement amount is small, and displacement when the diaper is worn can be effectively suppressed.

In such a pant-type disposable diaper, each stretchable film does not have a hole penetrating the stretchable film.

According to this underpants-type disposable diaper, the reduction in strength of the stretchable film due to the hole can be suppressed. In addition, the shrinkage force of the stretchable film can be effectively utilized.

In such a pant-type disposable diaper, the stretchable film has a hole penetrating the stretchable film, and the hole forms the ventilation portion.

According to this underpants-type disposable diaper, it is possible to suppress a decrease in air permeability in the high pressure region.

For this pant-type disposable diaper, the skin-side nonwoven fabric sheet, the non-skin-side nonwoven fabric sheet, the stretchable member, and the stretchable film are formed in the front-rear direction using the same welding pattern. welded together.

According to the underpants-type disposable diaper, in the front belt portion and the rear belt portion, the moist air in the diaper can be efficiently discharged in the front-rear direction (thickness direction), and the air permeability can be improved.

For such a pant-type disposable diaper, the welding pattern is a pattern in which a plurality of welding portions are scattered, and in the stretched state of the underpants-type disposable diaper, the area of the ventilation portion is larger than that at the high pressure The area of the weld in the region.

According to this underpants-type disposable diaper, it is possible to suppress the decrease in the air permeability of the high-pressure region caused by the welded portion.

A pant-type disposable diaper having an up-down direction, a left-right direction, and a front-rear direction crossing each other, the pant-type disposable diaper comprising: a front side belt part; a rear side belt part; and a pair of locking parts, In a pair of locking portions, both side portions in the left-right direction of the front side belt portion are locked to both side portions in the left-right direction of the rear side belt portion, and the rear side belt portion has a low A pressure area and a high pressure area, the low pressure area and the high pressure area have stretchability in the left-right direction, and the unit width portion in the vertical direction of the high pressure area is in the left-right direction The magnitude of the force required to extend the unit length is greater than the magnitude of the force required to extend the unit width in the up-down direction of the low-pressure region per unit length in the left-right direction, and the high-pressure region is The pair of locking portions extend continuously in the left-right direction, and the upper-lower direction of the high-pressure region is greater than that in the center portion of the high-pressure region in the left-right direction. The length is longer in both end portions in the left-right direction of the high-pressure region, and the lower end of the high-pressure region is at the lower end of the high-pressure region than in the center portion in the left-right direction of the high-pressure region. Both ends in the left-right direction are located at a lower position, and in the center portion in the left-right direction of the rear belt portion, the low-pressure region is arranged below the high-pressure region. side adjacent.

According to this shorts-type disposable diaper, since the high pressure region is connected to the front side belt portion, it is possible to suppress a decrease in the restraint pressure of the high pressure region. Additionally, the high pressure area is configured to match the position of the wearer's gluteus medius. Thus, the high pressure area can constrain the gluteus medius so that the wearer can be supported for movement (walking). On the other hand, the low-pressure region is configured to match the position of the gluteus maximus of the wearer, so that excessive restriction of the large-stretched gluteus maximus can be suppressed, and the comfort of the diaper can be improved.

In such a pant-type disposable diaper, the lower end of the high pressure region is inclined downward from the center portion in the left-right direction of the high pressure region toward both end portions.

According to the shorts-type disposable diaper, the shape of the high pressure region is similar to that of the gluteus medius of the wearer, which makes it possible to further support the wearer's movement (walking).

With this pant-type disposable diaper, the pants-type disposable diaper further includes an absorbent core, the high pressure region is configured not to overlap the rear side portion of the absorbent core in the front-rear direction, and The said low pressure area is arrange|positioned at least between the lower end of the said high pressure area, and the upper end of the back side part of the said absorptive core.

According to this pant-type disposable diaper, the shrinkage of the absorbent core due to the high pressure region can be suppressed, and the comfort of the diaper can be improved.

In such a pant-type disposable diaper, the front belt portion has a front elastic member that expands and contracts in the left-right direction, and the front elastic member extends between the pair of locking portions on the left and right sides. extending continuously in the direction, and the high pressure region is connected to the front side telescopic member in the locking portion.

According to this shorts-type disposable diaper, the high-pressure region and the front-side elastic member extend and fit in the circumferential direction around the waist of the wearer, so that displacement of the diaper can be suppressed. In addition, the restraint pressure in the high pressure area is increased, and the movement (walking) of the wearer can be further supported.

With this pant-type disposable diaper, the front side belt portion has: a front side low pressure area which is stretchable in the left-right direction; and a front side high pressure area which includes the front side stretchable member , the magnitude of the force required to extend the unit width portion in the vertical direction of the front high pressure region in the horizontal direction by a unit length is greater than that of making the front low pressure region in the vertical direction The size of the force required to extend the unit length of the unit width portion in the left-right direction, and the high pressure area is connected to the front side high pressure area in the locking portion.

According to this shorts-type disposable diaper, the high-pressure region and the front-side elastic member extend and fit in the circumferential direction around the waist of the wearer, so that displacement of the diaper can be suppressed. In addition, the restraint pressure in the high pressure area is increased, and the movement (walking) of the wearer can be further supported.

In such a pant-type disposable diaper, the front high pressure region includes a plurality of the front stretchable members arranged side by side at intervals in the vertical direction, and the high pressure region is included in the vertical direction. A plurality of rear stretchable members arranged side by side at intervals, the rear stretchable members expand and contract in the left-right direction, and in the locking portion, the front stretchable member at the highest position and the The rear elastic members at the highest position are connected to each other, and the front elastic members at the lowermost position and the rear elastic members at the lowermost position are connected to each other.

According to this shorts-type disposable diaper, the high-pressure region and the front-side elastic member extend and fit in the circumferential direction around the waist of the wearer, so that displacement of the diaper can be suppressed. In addition, the restraint pressure in the high pressure area is increased, and the movement (walking) of the wearer can be further supported.

In such a pant-type disposable diaper, the length in the vertical direction of the front high pressure region is longer than that in the center portion in the left and right direction of the front high pressure region. The side high pressure region is longer in both end portions in the left-right direction, and the upper end of the front side high pressure region is longer than in the center portion in the left-right direction of the front side high pressure region The position is higher in both end portions in the left-right direction of the front-side high-pressure region.

According to this shorts-type disposable diaper, the front high pressure region can restrain the gluteus medius on the wearer's side, and thus can further support the wearer's movement (walking). In addition, it is possible to suppress the situation that the front high pressure area constrains the abdominal region of the wearer, and the comfort of the diaper can be improved.

In such a pant-type disposable diaper, in the center portion in the left-right direction of the front belt portion, the front low pressure region is arranged adjacent to the upper side of the front high pressure region .

According to this shorts-type disposable diaper, the front low-pressure region is properly fitted to the abdominal region of the wearer, and displacement of the diaper can be suppressed.

With such a pant-type disposable diaper, the pants-type disposable diaper further includes an absorbent core, and the front side high pressure region is arranged so as not to overlap the front side portion of the absorbent core in the front-rear direction. .

According to this shorts-type disposable diaper, the shrinkage of the absorbent core due to the high pressure region on the front side can be suppressed, and the comfort of the diaper can be improved.

In such a pant-type disposable diaper, the high pressure region includes a plurality of rear stretchable members arranged side by side at intervals in the vertical direction, the rear stretchable members expand and contract in the left-right direction, and An interval between the rear elastic members adjacent in the up-down direction is in the left-right direction of the high-pressure region, compared to a center portion in the left-right direction of the high-pressure region. Wider in both ends in the direction.

According to this pant-type disposable diaper, the length of the high-pressure region in the vertical direction is longer in both left-right direction end portions of the high-pressure region than in the left-right direction central portion of the high-pressure region. Thus, the high pressure area is configured to match the position of the wearer's gluteus medius and can support the wearer's movement (walking).

In such a pant-type disposable diaper, the high pressure region includes a rear elastic member that expands and contracts in the left-right direction, and the rear elastic member is a sheet-like member.

According to this shorts-type disposable diaper, the high-pressure area is fitted to the wide area of the gluteus medius of the wearer, and thus the movement (walking) of the wearer can be further supported. Additionally, the high pressure areas lie flat against the wearer, thus preventing localized contractions and improving the comfort of the diaper.

In such a pant-type disposable diaper, in the high pressure region, a stretchable nonwoven fabric sheet and a stretchable film are arranged between the skin side sheet and the non-skin side sheet, and in the low pressure region, in the The stretchable nonwoven fabric sheet is arranged between the skin side sheet and the non-skin side sheet.

According to this shorts-type disposable diaper, the high-pressure area and the low-pressure area are flat against the wearer, so local shrinkage can be prevented, and the comfort of the diaper can be improved.

With this pant-type disposable diaper, the stretchable member is arranged to extend along a pair of leg openings.

According to this shorts-type disposable diaper, the elastic members at the leg openings are in close contact with the legs of the wearer, and the diaper can be suppressed from being pulled too high. Thus, the diaper can be applied correctly in such a way that the high pressure area is located at the gluteus medius of the wearer.

A pant-type disposable diaper having an up-down direction, a left-right direction, and a front-rear direction crossing each other, the pant-type disposable diaper comprising: a belt portion; and an absorbent main body, the belt portion having a low pressure region and a high pressure area, the low pressure area and the high pressure area are located below the stretch area extending along the edge of the waist opening, the low pressure area and the high pressure area are adjacent to each other, the low pressure area and the The high-pressure region has stretchability in the left-right direction, and the magnitude of the force required to extend the unit width in the vertical direction of the high-pressure region per unit length in the left-right direction is larger than that required to extend the low pressure region. The magnitude of the force required to extend the unit width in the vertical direction of the pressure region per unit length in the left-right direction, when the belt portion is viewed from at least one of the non-skin side and the skin side, the The color of at least a portion of the high pressure area is different from the color of the low pressure area.

According to the shorts-type disposable diaper, the user can recognize the position of the high-pressure area, and can locate the high-pressure area in the area of the wearer to be restrained. Thus, the diaper is worn in place on the wearer and the effect of high pressure areas is obtained. It is also possible to suppress a reduction in the comfort of the diaper due to high pressure areas being located in areas of the wearer that are not to be restrained.

In such a pant-type disposable diaper, when the belt portion is viewed from at least one of the non-skin side and the skin side, the color of the contour portion of the high-pressure region in the up-down direction is different from that of the The color of the low pressure area.

According to the shorts-type disposable diaper, the boundary between the high-pressure area and the low-pressure area is clear, and the user can more easily recognize the position of the high-pressure area.

In such a pant-type disposable diaper, when the belt portion is viewed from at least one of the non-skin side and the skin side, Δa* is the difference between the high-pressure area and the low-pressure area. The difference in the a* values in the L*a*b* color system, and let Δb* be the b* value in the L*a*b* color system between the high pressure area and the low pressure area , the color difference ΔE* between the high pressure area and the low pressure area calculated using the following expression is 1.45 or more: ΔE*=[(Δa*)2+(Δb*)2]1 /2.

According to this shorts-type disposable diaper, the user can discriminate the high-pressure area and the low-pressure area.

In this shorts-type disposable diaper, when the belt portion is viewed from the non-skin side,

The color difference ΔE* was 1.45 or more.

According to the shorts-type disposable diaper, the high-pressure area can be viewed from the non-skin side (outside), so the high-pressure area can be easily recognized by the user, and the high-pressure area can be easily positioned in the wearer's area to be restrained .

With such a pant-type disposable diaper, the high-pressure region includes a stretchable member that expands and contracts in the left-right direction, and the color of the stretchable member is different from that of the low-pressure region.

According to this shorts-type disposable diaper, the high-pressure area recognized by the user coincides with the area having the high restraint pressure, and thus the effect of the high-pressure area is easily obtained.

In such a pant-type disposable diaper, in the high pressure region, a plurality of members overlap each other in the thickness direction of the belt portion, and the stretchable member is arranged on the non-skin side.

According to the shorts-type disposable diaper, the high-pressure area can be more easily observed from the non-skin side (outer side), so the high-pressure area can be easily recognized by the user, and the high-pressure area can be easily positioned on the wearer's area to be Constrained area.

In such a pant-type disposable diaper, the stretchable member is a sheet-like stretchable member.

According to this pant-type disposable diaper, since the colored stretchable member has a flat shape, the area of the portion where the color of the high-pressure area is different from the color of the low-pressure area is large, and the high-pressure area can be more easily recognized.

In such a pants-type disposable diaper, the high pressure region includes a plurality of the stretchable members arranged side by side at intervals in the vertical direction.

According to the shorts-type disposable diaper, the stripe pattern is formed in the high pressure area, the stripe pattern is remarkable as a decorative feature, and the high pressure area can be more easily recognized by the user.

In such a pant-type disposable diaper, the stretchable member is intermittently coupled to the sheet disposed on the non-skin side with respect to the stretchable member through a plurality of coupling portions, and all adjacent ones in the up-down direction are coupled to each other. The interval between the joint parts is smaller than the length of the elastic member in the up-down direction, and the interval between the joint parts adjacent in the left-right direction is smaller than the left-right direction of the elastic member length in the direction.

According to this pant-type disposable diaper, the stretchable member is formed with fine pleats (concavities and convexities) so that the stretchable member is visible, while giving the user a soft impression of the diaper.

With this pant-type disposable diaper, the high-pressure area includes: a different color portion, which is different in color from that of the low-pressure area; and a non-differentiated portion, which is a portion other than the different-color portion, And the ratio of the different-colored portion per unit area is higher in the center portion of the belt portion in the left-right direction than in the end portion in the left-right direction of the belt portion.

According to this shorts-type disposable diaper, the high-pressure area is conspicuous in the center portion in the left-right direction of the belt portion, which is easily noticed by the user, so that the high-pressure area is easily recognized by the user.

With this pant-type disposable diaper, the belt portion includes a front side belt portion and a rear side belt portion, and extends from the waist opening to the center portion in the left-right direction of the front side belt portion. The length in the up-down direction of the upper end of the high-pressure region is different from the up-down direction of the upper end of the high-pressure region from the waist opening to the center portion in the left-right direction of the rear belt portion on the length.

According to this shorts-type disposable diaper, the front side and the back side of the diaper can be discriminated based on the visible high pressure area.

With this pant-type disposable diaper, the belt portion includes a front-side belt portion and a rear-side belt portion, and both side portions in the left-right direction of the front-side belt portion are locked to each other in a pair of locking portions. On both sides in the left-right direction of the rear belt portion, the high-pressure region has a first high-pressure region in the front-side belt portion, and the first high-pressure region is in the pair of locking portions The center portion in the left-right direction of the first high-pressure region is located below both ends of the first high-pressure region in the left-right direction.

According to this shorts-type disposable diaper, the abdominal region of the wearer can be prevented from being excessively restrained by the first high pressure region. In addition, the wearer's anterior superior iliac spine region can be restrained in both end portions in the left-right direction of the first high pressure region, and displacement of the diaper during use can be suppressed.

With this pant-type disposable diaper, the high pressure region has a second high pressure region in the front side belt portion, the second high pressure region in the left-right direction between the pair of locking portions continuously extending from above, both ends of the second high-pressure region in the left-right direction are located below the first high-pressure region, and a central portion of the second high-pressure region in the left-right direction At least a portion of it overlaps the first high pressure region.

According to this shorts-type disposable diaper, the wearer's abdominal region can be prevented from being excessively restrained by the second high-pressure region. In addition, the anterior superior iliac spine region of the wearer can be restrained in a manner of being supported from below in both end portions in the left-right direction of the second high pressure region, and displacement of the diaper during use can be suppressed.

With this pant-type disposable diaper, the belt portion includes a front-side belt portion and a rear-side belt portion, and both side portions in the left-right direction of the front-side belt portion are locked to each other in a pair of locking portions. On both sides in the left-right direction of the rear belt portion, the high pressure region has a third high pressure region in the rear belt portion, and the third high pressure region is in the pair of locking portions The center portion of the third high-pressure region in the left-right direction is positioned above both end portions of the third high-pressure region in the left-right direction.

According to this shorts-type disposable diaper, it is possible to prevent the center portion of the wearer's buttocks region from being excessively restrained by the third high-pressure region.

With this pant-type disposable diaper, the high pressure region has a fourth high pressure region in the rear belt portion, the fourth high pressure region in the left-right direction between the pair of locking portions The left and right ends of the fourth high-pressure region are located above the third high-pressure region, and the center portion of the fourth high-pressure region in the left-right direction At least a portion of it overlaps the third high pressure region.

According to this shorts-type disposable diaper, it is possible to prevent the center portion of the wearer's buttocks region from being excessively restrained by the fourth high-pressure region. In addition, the wearer's anterior superior iliac spine region can be restrained in both end portions in the left-right direction of the fourth high-pressure region, and displacement of the diaper during use can be suppressed.

===First Embodiment ===

"Basic Structure of Diaper 1"

Fig. 1 is a schematic perspective view of a pants-type disposable diaper 1 (hereinafter, also referred to as a diaper 1). Fig. 2 is a schematic plan view of the diaper 1 in an unfolded and extended state. Note that the stretched state of the diaper 1 is a state in which the diaper 1 is stretched so as to eliminate wrinkles, and the dimensions of the constituent members of the diaper 1 (for example, sheets constituting the outer body 20, etc.) match or are close to the dimensions of the members themselves . FIG. 3 is a schematic cross-sectional view taken along line I-I (center in the left-right direction) in FIG. 2 .

The diaper 1 has an up-down direction, a left-right direction, and a front-rear direction that intersect with each other, and has a thickness direction in which members overlap each other as shown in FIG. 3 . In the up-down direction, the side corresponding to the wearer's torso is the upper side, and the side corresponding to the wearer's crotch is the lower side. In the front-rear direction, the side corresponding to the wearer's abdomen is the front side, and the side corresponding to the wearer's back side is the rear side. In the thickness direction, the side in contact with the wearer is the skin side, and the opposite side is the non-skin side.

The diaper 1 includes the absorptive main body 10 and the exterior body 20 located on the non-skin side of the absorptive main body 10 . The exterior body 20 includes a ventral exterior body 21 (corresponding to the front belt portion) on the front side in the front-rear direction, a back exterior body 22 (corresponding to the rear belt portion) located on the rear side in the front-rear direction, and a connection The crotch portion exterior body 23 of the abdominal exterior body 21 and the back exterior body 22 .

Note that although the outer body 20 of the diaper 1 according to the present embodiment is composed of three members (the abdominal outer body 21, the back outer body 22, and the crotch outer body 23), it is not limited thereto. For example, the abdominal exterior body 21, the back exterior body 22, and the crotch portion exterior body 23 may be constituted by one member. In addition, the crotch portion exterior body 23 may be omitted.

When the diaper 1 is in the unfolded state shown in FIG. 2 , the abdominal exterior body 21 is located at one end side in the longitudinal direction of the absorptive main body 10 , and the back exterior body 22 is located at the other end side in the longitudinal direction of the absorptive body 10 . When the absorbent main body 10 of the diaper 1 in the unfolded state is folded once at the center CL in the longitudinal direction, the left and right ends of the abdominal exterior body 21 are joined to the left and right ends of the back exterior body 22 by welding or the like. part, the pant-type state shown in FIG. 1 is realized. In other words, the longitudinal direction of the absorptive main body 10 matches the up-down direction of the diaper 1, and the abdominal exterior body 21 and the back exterior body 22 are connected in a ring-like manner, so that the waist opening 1a is formed at the upper end, and the waist opening 1a is formed at the upper end. A pair of leg openings 1b are formed on the sides. Hereinafter, a region corresponding to both end portions in the left-right direction where the abdominal exterior body 21 and the back exterior body 22 are joined together is referred to as an end portion joining region 24 .

As shown in FIG. 3 , the absorptive main body 10 includes an absorptive core 11 , a liquid-permeable topsheet 12 on the skin side of the absorptive core 11 , and a backsheet 13 on the non-skin side of the absorptive core 11 . The back sheet 13 of this embodiment has a two-layer structure including a liquid-impermeable sheet 13a and a liquid-permeable sheet 13b disposed on the non-skin side of the liquid-impermeable sheet 13a.

The absorptive core 11 is a member that absorbs and retains excretory fluid such as urine, and is formed, for example, by liquid-absorbent fibers such as pulp or the like containing a superabsorbent polymer (SAP). Although not shown, the outer peripheral surface of the absorptive core 11 may be covered with a liquid-permeable sheet made of tissue paper, nonwoven fabric, or the like.

As shown in FIG. 2 , the abdominal exterior body 21 and the back exterior body 22 respectively include waist regions 211 and 221 and crotch regions 212 and 222 below the waist regions 211 and 221, wherein the waist regions 211 and 221 are in the up-down direction End bonding regions 24 are included.

The crotch regions 212 and 222 are substantially trapezoidal, and the width in the left-right direction (length in the left-right direction) decreases toward the lower side. The crotch region 222 of the back outer body 22 is larger than that of the abdominal outer body 21 so as to be able to cover the buttocks region of the wearer.

As shown in FIG. 3 , the ventral exterior body 21 and the back exterior body 22 include skin side sheets 213 and 223, non-skin side sheets 214 and 224, and stretchable nonwoven fabric sheets 215 and 225 (corresponding to stretchable members), respectively. , wherein the stretchable nonwoven sheets 215 and 225 are located between the skin side sheets 213 and 223 and the non-skin side sheets 214 and 224 and have stretchability at least in the left-right direction of the diaper 1 .

The skin side sheets 213 and 223, the non-skin side sheets 214 and 224, and the stretchable nonwoven fabric sheets 215 and 225 are joined by a plurality of interspersed welding parts (for example, refer to 40 in FIG. 6B described later). Therefore, the texture is softer than in the case of bonding by, for example, a cured adhesive. In addition, the stretchable nonwoven fabric sheets 215 and 225 are shrunk between the welded portions, so that portions of the skin side sheets 213 and 223 and the non-skin side sheets 214 and 224 protrude so as to be bent outward in the thickness direction. In other words, the skin side panels 213 and 223 and the non-skin side panels 214 and 224 are raised between the welded portions, thereby making the texture softer and also giving a soft visual impression to the user. Since the welded portions are spread so that the gaps between the welded portions are relatively small, in the diaper 1 of the present embodiment, fine ridges (wrinkles) extending in various directions are formed, and it is possible to prevent the formation of unidirectional wrinkles peculiar to diapers. pleats (for example, longitudinal pleats, etc.), so that the diaper 1 obtains a good appearance.

The stretchable nonwoven sheets 215 and 225 include, for example, elastic thermoplastic elastomer fibers made of urethane elastomer and inelastic thermoplastic resin fibers made of polyolefin resin such as polypropylene (PP). The stretchable non-woven sheets 215 and 225 are non-woven sheets that have undergone appropriate elongation treatments such as gear elongation. According to this stretching process, the stretchable nonwoven fabric sheets 215 and 225 have stretchability in the left-right direction and the vertical direction of the diaper 1 . Note that the elongation treatment may be an elongation treatment performed in directions orthogonal to each other, or an elongation treatment performed only in a predetermined direction. In the case where the elongation treatment is performed only in the predetermined direction, the stretchability is exhibited in the predetermined direction, but it is not necessarily the case that all the fibers are oriented in the predetermined direction, and therefore also in the direction orthogonal to the predetermined direction. Exhibits flexibility.

In addition, a plurality of waist elastic members 26 (eg, elastic threads, etc.) are arranged in a region extending along the edge of the waist opening 1a. Further, leg elastic members 27 (eg, elastic threads, etc.) are also arranged in regions extending along the edges of the leg openings 1b. Therefore, the waist region and the leg region of the diaper 1 are reliably brought into contact with the wearer.

The crotch outer body 23 has a similar configuration to the ventral outer body 21 and the back outer body 22, and the crotch outer body 23 includes a skin side panel 231, a non-skin side panel 232 on the non-skin side, and a skin side panel 231 A stretchable nonwoven sheet 233 between the non-skin side sheet 232.

"High Pressure Area 30s"

4A to 4C are conceptual diagrams showing the wearing state of the diaper 1 . FIG. 4A is a view viewed from the front side, FIG. 4B is a view viewed from the rear side, and FIG. 4C is a side view. In these figures, the first high-pressure region 31s and the second high-pressure region 32s are shown by dashed-dotted lines.

5A and 5B are schematic cross-sectional views of the ventral exterior body 21 and the back exterior body 22 . FIG. 5A is a cross-sectional view of the present embodiment, and FIG. 5B is a cross-sectional view of a modification example.

FIG. 6A is an explanatory diagram of the high-pressure region 30s, and FIG. 6B is an explanatory diagram of the vent portion 34 and the welded portion 40 .

The waist regions 211 and 221 of the abdominal outer body 21 and the back outer body 22 have stretchable regions 26s extending along the edge of the waist opening 1a. The expansion-contraction area|region 26s is the area|region in which the linear waist elastic member 26 which has left-right direction elasticity is provided. Below the stretchable region 26s, the waist regions 211 and 221 each include a high-pressure region 30s and a low-pressure region 33s, which are regions other than the high-pressure region.

The low pressure region 33s is a region where the stretchable nonwoven fabric sheet 215 (225) is provided between the skin side sheet 213 (223) and the non-skin side sheet 214 (224). As shown in FIG. 2 , in the abdominal exterior body 21, the low-pressure region 33s includes a base region 21s adjacent to the lower side of the expansion-contraction region 26s at the center in the left-right direction.

The high pressure region 30s is located between the skin side sheet 213 (223) and the non-skin side sheet 214 (224), is an area where the stretchable nonwoven fabric sheet 215 (225) and the stretchable film 30 are provided, and is covered on the ventral side The body 21 and the backside exterior body 22 extend circumferentially around. The stretchable film 30 is a sheet-like stretchable elastic member having a uniform thickness, and is obtained, for example, by melting an elastomer resin such as polyurethane or styrene. In addition, the stretchable film is, for example, a film in which a polyolefin layer is integrally formed on the upper surface and the lower surface of the elastomer layer. If this type of stretchable film is used, considering that the polyolefin layer does not have stretchability, stretchability can be provided by stretching the film in advance. Providing a polyolefin layer on the upper surface has the advantage of facilitating welding to a nonwoven sheet made of polyolefin fibers.

The high pressure area 30s is an area with a higher pressure (restraint pressure) when the diaper 1 is worn than the low pressure area 33s. In other words, the force required to extend a part of the high-pressure region 30s having a unit width (unit length in the vertical direction) in the left-right direction by a unit length is larger than that required to extend the unit width (up-down direction) of the low-pressure region 33s (base region 21s ) The force required to extend a part of the unit length in the left-right direction.

In other words, the contraction force acting in the left-right direction per unit length in the up-down direction in the high-pressure region 30s is larger than the contraction force acting in the left-right direction per unit length in the up-down direction in the low-pressure region 33s. Due to the greater contractile force in this way, the high pressure area 30s presses strongly against the wearer.

Note that a known method can be used to measure and compare the magnitude of the force required to elongate the high pressure region 30s per unit width and the base region 21s (low pressure region 33s) per unit length in the left-right direction. For example, a sample having a predetermined size is cut out from the high pressure region 30s and the base region 21s. Then, both ends of each sample in the left-right direction of the diaper 1 were clamped in the chucks of the tension tester. The sample is then elongated by pulling the chuck apart a unit length, and the load (N) at this time can be used as the force required to elongate the sample by a unit length in the left-right direction.

In this way, in the diaper 1 of the present embodiment, the high pressure region 30s continuously extends in the circumferential direction in the portions of the abdominal outer body 21 and the back outer body 22, thereby improving the abdominal outer body 21 and the back side The degree of close contact in the portion of the exterior body 22 . For this reason, the positional displacement of the diaper 1 at the time of being worn can be suppressed, without imparting an excessive amount to the wearer, compared with the case where the degree of close contact of the entire abdominal exterior body 21 and the back exterior body 22 is improved. The feeling of being restrained. In addition to the high pressure areas 30s, due to the stretchable nonwoven sheets 215 and 225, the low pressure areas 33s can also be held against the wearer's body with appropriate pressure.

In the high pressure region 30s, the sheet-like stretchable film 30 is overlapped with the stretchable nonwoven fabric sheets 215 and 225. To this end, the high pressure area 30s can be in flat contact with the wearer, and the pressure exerted by the high pressure area 30s acts evenly on the wearer's skin. Therefore, local restraint such as in the case where a linear elastic member is provided in place of the stretchable film 30 can be prevented, and the formation of stretchable member traces can be suppressed.

In addition, even if the stretchable films 30 are thin, they have a higher shrinkage force (restraining pressure) than the stretchable nonwoven fabric sheet. For this reason, although the stretchable film 30 is overlapped on the stretchable nonwoven fabric sheets 215 and 225 in the high-pressure region 30s, the thickness of the high-pressure region 30s can be made small, and deterioration of texture and heat dissipation can be suppressed.

Moreover, in at least the abdominal exterior body 21 or the back exterior body 22, 30 s of high pressure regions do not overlap the absorptive core 11 in the front-back direction (thickness direction). As shown in FIG. 2 , in the diaper 1 of the present embodiment, the high pressure regions 30s on the abdomen side and the back side do not overlap with the absorptive core 11 . For this reason, the restraint pressure of the high pressure region 30s can be suppressed from being damaged by the thick and highly rigid absorptive core 11 .

In addition, in the ventral exterior body 21 and the back exterior body 22, the skin side sheets 213 and 223 positioned farthest on the skin side and the non-skin side sheets 214 and 224 positioned farthest on the non-skin side are Nonwoven sheets made of, for example, spunbond nonwovens, SMS nonwovens, and the like. In addition, the elastic members that expand and contract the waist regions 211 and 221 in the left-right direction are the elastic nonwoven fabric sheets 215 and 225 . These nonwoven fabric sheets have spaces between constituent fibers and thus have air permeability in the thickness direction.

On the other hand, the stretchable film 30 arranged in the high pressure region 30s is inferior in air permeability as compared with the nonwoven fabric. For this reason, if only the stretchable film 30 is provided in the high-pressure region 30s, the air permeability of the high-pressure region 30s decreases. With this configuration, the inside of the diaper 1 becomes wet, less comfortable and causes skin irritation (eg, sweat rash).

In view of this, the high-pressure region 30s has the ventilation portion 34 having higher air permeability than that of the portion where the stretchable film is located. In the high pressure region 30s of the present embodiment, a plurality of stretchable films 30 long in the left-right direction are arranged side by side at intervals in the up-down direction, and the portion between the adjacent stretchable films 30 in the up-down direction (that is, A portion where the stretchable film 30 is not located) serves as the ventilation portion 34 .

More specifically, the high pressure area 30s includes a first high pressure area 31s and a second high pressure area 32s. In both the first high pressure region 31s and the second high pressure region 32s, the three stretchable films 30 are arranged side by side at intervals in the up-down direction. The three stretchable films 30 on the ventral exterior body 21 side and the corresponding three stretchable films 30 on the back exterior body 22 side are arranged at the same position in the vertical direction in the end joint region 24 . In other words, in the end joint region 24, the three stretch films 30 on the ventral outer body 21 side and the three stretch films 30 on the back outer body 22 side are connected to each other in a continuous manner, and the high pressure region 30s extends circumferentially around the ventral exterior body 21 and the dorsal exterior body 22 .

Since the high-pressure region 30s has the ventilation portion 34 (breathability in the thickness direction) in this manner, the moist air in the diaper 1 is discharged from the high-pressure region 30s, and the steam in the diaper 1 can be reduced. Therefore, the comfort of the diaper 1 is improved and sweat rash and the like can be suppressed.

Note that, in the end joint region 24, the high pressure region 30s located on the ventral side and the high pressure region 30s located on the back side are not limited to be completely continuous with each other, it is sufficient that they are at least partially continuous in the circumferential direction around the waist. For example, the ventral high pressure region 30s may be configured higher than the dorsal high pressure region 30s such that a height difference is provided in the end joint region 24 and the high pressure region is partially connected.

In addition, the stretchable films 30 are each positioned between the skin side sheet 213 (223) and the non-skin side sheet 214 (224). Because the stretchable film 30 is not exposed on the non-skin side, damage or peeling of the stretchable film 30 due to movement or friction against the wearer's clothing during use can be suppressed. In addition, when the stretchable film 30 is exposed on the skin side, the stretchable film 30 tends to be in close contact with the wearer's skin, and the air permeability in the plane direction of the high-pressure region 30s decreases. In order to solve this problem, as shown in FIG. 5A , the nonwoven fabric sheets such as the skin side sheets 213 and 223 are protruded in such a manner as to be bent outward in the thickness direction due to the shrinkage of the stretchable film 30 . For this purpose, the skin side sheet 213 ( 223 ) (non-woven fabric sheet) is arranged on the skin side of the stretchable film 30 to form a space S (ventilation passage) between the skin side sheet 213 ( 223 ) and the wearer's skin ). Therefore, breathability is ensured in the plane direction of the abdominal exterior body 21 and the back exterior body 22, and the steam inside the diaper 1 can be further reduced.

Regions other than the high-pressure region 30s also have air permeability in the thickness direction. More specifically, the stretchable region 26s is a region in which the waist elastic members 26 are arranged side by side at intervals in the up-down direction, and each waist elastic member 26 is located in the breathable skin side sheets 213 ( 223 ) and non-skin side sheets 214 ( 224 ). )between. Therefore, the stretchable region 26S has air permeability.

In addition, the low pressure region 33s (base region 21s) is a region where the stretchable nonwoven fabric sheets 215 and 225 having air permeability are provided, and each of the stretchable nonwoven fabric sheets 215 and 225 is located on the skin side sheet having air permeability 213 (223) and the non-skin side panels 214 (224). Therefore, the low pressure region 33s also has air permeability.

In this way, the waist regions 211 and 221 of the abdominal outer body 21 and the back outer body 22 have breathability over their entire ranges. For this reason, the steam inside the diaper 1 can be further reduced.

In addition, as shown in FIG. 6A, it is preferable that the vertical length L1 from the upper end 30a of the high pressure region 30s to the upper end 21a of the abdominal outer body 21 is larger than the height at the center C in the left-right direction of the abdominal outer body 21. The vertical length L2 of the pressure region 30s (L1>L2).

According to this configuration, at the center C in the left-right direction of the abdominal exterior body 21, the high-pressure region 30s is located at a relatively low position. For this reason, the high pressure region 30s is located at a relatively low position. Therefore, the high pressure region 30s is less likely to abut against the wearer's navel region, and the steam in the diaper 1 can be further reduced. Additionally, since the high pressure area 30s does not rest against the wearer's navel area, the wearer can breathe more easily.

In addition, it is preferable that the stretchable members arranged in the high-pressure region 30s and the low-pressure region 33s are sheet-like members having air permeability. The sheet-like member having air permeability is the stretchable nonwoven fabric sheets 215 and 225 or a stretchable film having holes.

According to this configuration, the high-pressure area 30s and the low-pressure area 33s can be in close ground-face contact with the wearer, while also ensuring air permeability in the high-pressure area 30s and the low-pressure area 33s. For this reason, local restraint can be prevented, and the formation of stretchable member traces can be suppressed. In addition, since the high-pressure area 30s and the low-pressure area 33s are in close ground-surface contact with the wearer, the contact area (ie, frictional resistance) of the skin increases. This can further suppress displacement of the diaper 1 when it is worn.

Note that the above description is not limited, and the stretchable member may be a plurality of linear elastic members arranged side by side at intervals in the up-down direction. In addition, although the stretchable nonwoven fabric sheets 215 and 225 are not arrange|positioned in the expansion-contraction area|region 26s as shown in FIG. 3 in this embodiment, you may arrange|position the sheet-like member which has air permeability in the expansion-contraction area|region 26s.

In addition, it is preferable that the stretchable nonwoven fabric sheet 215 ( 225 ) as shown in FIG. 3 is arranged at a position between the skin side sheet 213 ( 223 ) and the non-skin side sheet 214 ( 224 ), and expands and contracts with respect to the corresponding The sexual membrane 30 is located on the skin side.

According to this configuration, as shown in FIG. 5A , the two nonwoven fabric sheets (ie, the stretchable nonwoven fabric sheet 215 ( 225 ) and the skin side sheet 213 ( 223 )) are bent toward the skin side due to the shrinkage of the stretchable film 30 way to highlight. For this reason, a large space S (ventilation passage) is formed between the skin side sheet 213 (223) and the wearer's skin. Therefore, this improves the air permeability of the abdominal exterior body 21 and the back exterior body 22 in the plane direction.

In addition, the high-pressure region 30s of this embodiment has the ventilation part 34 located between the elastic|stretch films 30 adjacent to an up-down direction. In this case, it is preferable that each stretchable film 30 does not have a hole penetrating the stretchable film 30 .

According to this configuration, the reduction in strength of the stretchable film 30 caused by the pores can be suppressed. In addition, the confinement pressure of the stretchable film 30 is not lowered due to the holes, and the stretchable film 30 can be effectively utilized. However, not limited thereto, the stretchable film 30 may have holes.

In addition, in the high-pressure region 30s, it is preferable that the area of the portion including the stretchable films 30 is larger than the area of the ventilation portion 34 provided between the stretchable films 30 adjacent in the vertical direction. According to this configuration, the restraint pressure of the high-pressure region 30s can be improved while also suppressing a decrease in air permeability of the high-pressure region 30s, and displacement of the diaper 1 during use can be suppressed.

In the present embodiment, the stretchable film 30 and the ventilation portion 34 have substantially the same length in the vertical direction. In addition, each of the first high-pressure region 31s and the second high-pressure region 32s has three stretchable membranes 30 and two ventilation portions 34 . For this reason, the area of the portion including the stretchable film 30 is larger than the area of the ventilation portion 34 .

Note that the area can be compared using known methods in the natural state of the diaper 1 or in the extended state of the diaper 1 . For example, the comparison may be performed visually, or the respective partial areas calculated from the captured image of the high-pressure region 30s may be used for comparison using area calculation software.

In addition, it is preferable that the four types of sheets (ie, the skin side sheet 213 ( 223 ), the non-skin side sheet 214 ( 224 ), the stretchable nonwoven fabric sheet 215 ( 225 ) and the stretch film 30 are welded by using the same The pattern is welded and combined in the thickness direction (front and rear direction). In other words, preferably, four types of sheets are welded at the same time. For example, the welding method can be known as heat welding, ultrasonic welding or welding by laser irradiation etc. method.

The welding pattern is a pattern in which a plurality of welding portions 40 are scattered. In this embodiment, as shown in FIG. 6B and FIG. 7C to be described later, rectangular welded portions 40 inclined by 45 degrees or -45 degrees from the left-right direction are arranged side by side at intervals in the left-right direction and the vertical direction. Note that the welding pattern shown in FIG. 6B is an example, and the shape, size, number, arrangement, and the like of the welding portions 40 are not limited to the configuration shown.

Since the sheet becomes a film-like state, the air permeability in the welded portion 40 decreases. For this reason, if the paired sheets adjacent in the thickness direction are respectively welded and the welded portions 40 are displaced in the plane direction between the layers, the moist air in the diaper 1 cannot be smoothly discharged as indicated by the arrows in FIG. 5B . . For this reason, by welding four types of sheets at the same time, it is possible to efficiently discharge the moist air inside the diaper 1 in the thickness direction as indicated by the arrows in FIG. 5A , thereby improving the abdominal exterior body 21 and the back exterior body 22 Air permeability in the thickness direction.

In addition, sheets adjacent in the thickness direction may be bonded using an adhesive. Note that even when cured adhesives are used, air permeability is reduced. If the application patterns of the adhesive for bonding adjacent sheets in the thickness direction are the same and the application positions overlap each other, the moist air inside the diaper 1 can be effectively discharged, but it is difficult to make the adhesive application pattern position alignment. For this reason, it is preferable to bond the four types of sheets by simultaneous welding as described above.

Moreover, in the extended state of the diaper 1, it is preferable that the area of the ventilation part 34 of 30 s of high pressure areas is larger than the area of the welding part 40 located in 30 s of high pressure areas. Specifically, as shown in FIG. 6B , it is preferable that the area of one vent portion 34 between adjacent stretchable films 30 in the up-down direction is larger than the area of the welded portion 40 in one high-pressure region.

According to this configuration, it is possible to prevent the ventilation portion 34 from being covered with the welded portion 40 that reduces the air permeability. Therefore, the air permeability of the high-pressure region 30s can be maintained. Note that, as described above, the areas of the corresponding portions can be compared using a known method such as a method of visual comparison or a method using area calculation software.

In addition, in the end joint region 24, the first high-pressure region 31s is arranged above the second high-pressure region 32s at a certain distance from the second high-pressure region 32s. In addition, it is preferred that the first high pressure region 31s is configured such that at least its upper end is above the wearer's anterior superior iliac spine, and the second high pressure region 32s is configured such that at least its lower end is above the wearer's anterior superior iliac spine below the anterior superior iliac spine. In the present embodiment, the lower end of the first high pressure region 31s is configured to pass through the anterior superior iliac spine. Note that the anterior superior iliac spine is the protrusion of the ilium, which is the largest bone in the pelvis, and is the protrusion that fingers touch when a person's hand is placed on their waist. Thus, when the diaper 1 is worn, the wearer's anterior superior iliac spine is placed between the first high pressure area 31s and the second high pressure area 32s. Therefore, this makes it possible to suppress the displacement of the diaper 1 when it is worn.

In addition, on the ventral side, the first high-pressure region 31s is convexly curved downward, and on the dorsal side, the first high-pressure region 31s is substantially horizontal in the vicinity of the bottom of the expansion-contraction region 26s. On the other hand, on the ventral side, the second high-pressure region 32s is substantially horizontal, and on the dorsal side, the second high-pressure region 32s is convexly curved upward. Therefore, as shown in FIGS. 4A to 4C , the lower end of the first high pressure region 31s on the back side is higher than the lower end of the first high pressure region 31s on the abdominal side at the center C in the left-right direction of the diaper 1 . Similarly, at the center C in the left-right direction of the diaper 1, the lower end of the second high pressure region 32s located on the back side is higher than the lower end of the second high pressure region 32s located on the abdominal side. Therefore, the abdominal region can be depressed obliquely upward, and the intra-abdominal pressure can be raised. Therefore, this makes it possible to assist the movement of the muscles of the pelvic region, such as the abdominal muscles, and to stabilize the wearer's pelvis.

As described above, in the lateral side portions A2 (see FIG. 2 ) of the abdominal exterior body 21 and the back exterior body 22 , the first high pressure region 31 s and the second high pressure region 32 s are separated from each other in the vertical direction. On the other hand, in the left-right direction center part A1 of the abdominal exterior body 21 and the back exterior body 22, the 1st high pressure area|region 31s and the 2nd high pressure area|region 32s partially overlap.

For this reason, in the lateral portion A2 of the abdominal exterior body 21 and the back exterior body 22, the ratio of the ventilation portion 43 in the high pressure region 30s is higher than the ratio of the ventilation portion 43 in the lateral central portion A1. In other words, the value obtained by dividing the area of the vent portion 43 by the area of the high pressure region 30s (the total area of the first high pressure region 31s and the second high pressure region 32s) is large.

In this way, by setting a higher ratio of the ventilation portion 43 in the left-right direction side portion A2 where the movement of the wearer (the movement of the buttocks and the legs) is large, the restraint force of the high-pressure region 30s can be suppressed while at the same time. The breathability of the ventral outer body 21 and the back outer body 22 is also improved, and the wearer's movement can be prevented from being impaired. On the other hand, by setting a lower ratio of the ventilation portion 43 in the left-right direction central portion A1 where the movement of the wearer is small, the left-right direction central portion A1 is reliably brought into close contact with the wearer, and it is possible to effectively suppress the Displacement of the diaper 1 during use.

Note that the left-right direction center portion A1 of the abdominal exterior body 21 and the back exterior body 22 is the center portion when the abdominal exterior body 21 and the back exterior body 22 are divided into three parts in the left-right direction, and is located in the center portion The portions on both outer sides of , are the left-right direction side portions A2. In addition, the areas of the corresponding portions may be compared using a known method such as a method of visual comparison or a method using area calculation software.

In addition, the shape of the high pressure region 30s is not limited to the shape shown in FIG. 2 . For example, not limited to providing two high pressure regions 30s, one or three or more high pressure regions 30s may be provided. In addition, the high pressure region 30s may be horizontal in the left-right direction on the ventral side and the back side, for example.

《Variation of 30s in high pressure area》

7A to 7C are explanatory diagrams of the high pressure region 30s according to the modification. FIG. 7A shows the stretchable film 30 in the natural state, and FIG. 7B shows the stretchable film 30 in the left-right direction stretched state. FIG. 7C shows the dimensions of the welded portion 40 .

Although not shown, in the high-pressure area 30s according to the modification, the stretchable membrane 30 is arranged over the entire area of the high-pressure area 30s. In other words, in the high-pressure region 30s of this modification, the ventilation portion 34 is not provided between the stretchable films 30 arranged side by side at intervals in the vertical direction (see FIG. 6A ). For this reason, the confinement pressure is substantially uniform in the high-pressure region 30s, and the contraction force exerted by the high-pressure region 30s is stable.

The stretchable film 30 has a hole 50 penetrating the stretchable film 30, and the hole 50 serves as a ventilation portion of the high-pressure region 30s. According to this structure, the moist air in the diaper 1 can be discharged through the holes 50, and the air permeability in the thickness direction of the high-pressure region 30s can be suppressed from decreasing.

An example of a method for forming the holes 50 is as follows: as shown in FIG. 7A , in the stretchable film 30 in the natural state, a plurality of slits extending in the up-down direction are formed side by side at intervals in the up-down and left-right directions. In this case, as shown in FIG. 7B , in a state in which the stretchable film 30 is stretched in the left-right direction, that is, in a wearing state, the holes 50 are developed in the left-right direction (for example, by about twice to quadruple expansion), thus allowing the moist air to escape through the holes 50. Note that the pattern of the holes 50 shown in FIGS. 7A and 7B is an example, and the shape, size, number, configuration, etc. of the holes 50 are not limited to the configuration shown.

In addition, similarly to the above-mentioned embodiment, it is preferable that the area of the hole 50 (vent portion) in the extended state of the diaper 1 is larger than the area of the welded portion 40 located in the high-pressure region 30s. In this embodiment, in the extended state of the diaper 1, the length of the hole 50 in the left-right direction is about 2 mm to 4 mm, and the length in the vertical direction is about 1 mm. On the other hand, the welded portion 40 has a rectangular shape in which the long side is about 0.5 mm and the short side is about 0.3 mm.

In this way, the area of one hole 50 is larger than that of one welded portion 40 , thereby preventing a situation where the hole 50 is covered by the welded portion 40 . Therefore, the air permeability of the high-pressure region 30s can be maintained. Note that, as described above, the areas of the corresponding portions can be compared using a known method such as a method of visual comparison or a method using area calculation software.

===Second Embodiment ===

Hereinafter, the second embodiment of the underpants-type disposable diaper will be described by taking the underpants-type disposable diaper for adults as an example. However, not limited to this, the pant-type disposable diaper of the present invention can be applied to a disposable diaper for children (baby), sanitary pants, and the like.

"Basic Structure of Diaper 300"

Fig. 8 is a schematic perspective view of a pants-type disposable diaper 300 (hereinafter, also referred to as a diaper 300). Figure 9 is a schematic plan view of the diaper 300 in a deployed and extended state. FIG. 10 is a schematic cross-sectional view taken along line I-I (center in the left-right direction) in FIG. 9 . 11A is a diagram showing an example of a joint portion 350 of the front side belt portion 321 and the rear side belt portion 322 , and FIG. 11B is a schematic cross-sectional view of the front side belt portion 321 and the rear side belt portion 322 .

The diaper 300 has an up-down direction, a left-right direction, and a front-rear direction that intersect with each other, and has a thickness direction in which members overlap each other as shown in FIG. 10 . In the up-down direction, the side corresponding to the wearer's torso is the upper side, and the side corresponding to the wearer's crotch is the lower side. In the front-rear direction, the side corresponding to the wearer's abdomen is the front side, and the side corresponding to the wearer's back side is the rear side. In the thickness direction, the side in contact with the wearer is the skin side, and the opposite side is the non-skin side.

The diaper 300 includes an absorbent body 310 and an outer body 320 located on the non-skin side of the absorbent body 310 . The outer body 320 includes a front strap 321 on the wearer's abdomen, a rear strap 322 on the wearer's back, and a crotch 323 connecting the front strap 321 and the rear strap 322 .

Note that although the outer body 320 of the diaper 300 according to the present embodiment is composed of three members (the front side belt portion 321, the rear side belt portion 322, and the crotch portion 323), it is not limited thereto. For example, the front side strap portion 321, the rear side strap portion 322, and the crotch portion 323 may be formed of a single continuous member. In addition, the crotch portion 323 may be omitted.

When the diaper 300 is in the unfolded state shown in FIG. 9 , the front belt part 321 is located at one end side in the longitudinal direction of the absorptive main body 310 , and the rear side belt part 322 is located at the other end side in the longitudinal direction of the absorptive main body 310 . When the absorptive main body 310 of the diaper 300 in the unfolded state is folded once at approximately the center in the longitudinal direction, the left and right ends of the front belt portion 321 and the left and right ends of the rear belt portion 322 are locked in the When in the pair of locking portions 324, the pant-type state shown in FIG. 8 is achieved. In other words, the longitudinal direction of the absorptive main body 310 matches the vertical direction of the diaper 300, and the front belt portion 321 and the rear belt portion 322 are connected in an endless manner, thereby forming the waist opening 300a at the upper end and forming a Opening 300b for the legs. Note that the locking method by the locking portion 324 is, for example, welding, bonding using an adhesive, or the like.

As shown in FIG. 10 , the absorptive main body 310 includes an absorptive core 311 , a liquid-permeable front sheet 312 on the skin side of the absorptive core 311 , and a back sheet 313 on the non-skin side of the absorptive core 311 . The back sheet 313 of this embodiment has a two-layer structure including a liquid-impermeable sheet 313a and a hydrophobic liquid-permeable sheet (for example, a hydrophobic non-skin sheet) disposed on the non-skin side of the liquid-impermeable sheet 313a. spun cloth) 313b.

The absorptive core 311 is a member that absorbs and retains excretion fluid such as urine, and is formed, for example, by liquid-absorbent fibers such as pulp or the like containing a superabsorbent polymer (SAP). Although not shown, the outer peripheral surface of the absorptive core 311 may be covered with a liquid-permeable sheet made of tissue paper, nonwoven fabric, or the like.

As shown in FIG. 9 , the front side belt portion 321 and the rear side belt portion 322 respectively include waist regions 3211 and 3221 as portions overlapping the locking portion 324 in the up-down direction and a crotch region 3212 below the waist regions 3211 and 3221 and 3222.

The crotch regions 3212 and 3222 are substantially trapezoidal, and their lateral widths (lengths in the left-right direction) decrease toward the lower side. In addition, the crotch region 3222 of the rear belt portion 322 is larger than the front belt portion 321 so as to be able to cover the buttocks region of the wearer.

As shown in FIG. 10, the front side belt portion 321 and the back side belt portion 322 respectively comprise skin side panels 3213 and 3223, non-skin side panels 3214 and 3224, and a stretchable nonwoven between the skin side panels and the non-skin side panels Cloth pieces 3215 and 3225. The skin side panels 3213 and 3223 and the non-skin side panels 3214 and 3224 may be soft sheets made of spunbond nonwoven fabric, SMS nonwoven fabric, or the like. In addition, the skin side panels 3213 and 3223 and the non-skin side panels 3214 and 3224 are substantially non-stretchable panels that do not stretch.

The stretchable nonwoven fabric sheets 3215 and 3225 are sheets that stretch at least in the left-right direction of the diaper 300 . In addition, the stretchable nonwoven fabric sheets 3215 and 3225 are nonwoven fabric sheets containing stretchable fibers and non-stretchable fibers (ie, extensible fibers whose shrinkability is lower than that of the stretchable fibers).

As an example of the stretchable non-woven fabric sheets 3215 and 3225, there can be provided a non-woven fabric sheet made by subjecting stretchable fibers and non-stretchable fibers to an appropriate elongation treatment (eg, gear elongation); The elastic fiber is made of polyurethane elastomer (polyurethane elastomer is an elastic thermoplastic elastomer), and the non-stretch fiber is made of polyolefin resin such as polypropylene (PP) (polyolefin resin is a non-elastic thermoplastic resin) production. Note that the elongation treatment may be carried out in mutually orthogonal directions (the left-right direction and the up-down direction of the diaper 300 ), or only in a predetermined direction (the left-right direction of the diaper 300 ). Note that in the case where the elongation treatment is performed only in a predetermined direction, stretchability is exhibited in the predetermined direction. However, not all fibers are necessarily oriented in the predetermined direction, and therefore stretchability is also exhibited in the direction orthogonal to the predetermined direction.

The skin side sheet 3213 ( 3223 ), the non-skin side sheet 3214 ( 3224 ), and the stretchable nonwoven fabric sheet 3215 ( 3225 ) are formed by the joint 350 in a state where the stretchable nonwoven fabric sheets 3215 and 3225 are stretched in the left-right direction. ) combined. As shown in FIG. 11A , it is desirable that the joints 350 are spread in the left-right direction and the up-down direction of the diaper 300 . According to this configuration, when the diaper 300 is shrunk, portions of the skin side panels 3213 and 3223 and the non-skin side panels 3214 and 3224 between the joints 350 are gathered so as to form protrusions that protrude outward in the thickness direction. On the other hand, the stretchable non-woven fabric sheets 3215 and 3225 are expanded in the thickness direction due to the fact that when the non-stretchable fibers are brought together (aggregated), the stretchable fibers shrink. For this reason, the protrusions are supported by the fibers of the stretchable nonwoven fabric sheets 3215 and 3225 and are not easily collapsed, and the protrusions have high cushioning capacity. This makes it possible to improve the texture of the front side belt portion 321 and the rear side belt portion 322 on the wearer's skin. In addition, the diaper 300 can be visually given a soft impression to the user.

Similar to the front belt portion 321 and the rear belt portion 322, the crotch portion 323 also has a structure in which a stretchable nonwoven fabric sheet 3233 is arranged between the skin side sheet 3231 and the non-skin side sheet 3232. However, the structure of the crotch portion 323 is not particularly limited to this, and for example, a structure in which the skin side sheet 3231 is not provided and the stretchable nonwoven fabric sheet 3233 is provided between the absorptive main body 310 and the non-skin side sheet 3232 is possible.

"Low Pressure Area 330 and High Pressure Area 340"

FIG. 12 is a schematic plan view of the rear side strap portion 322 . FIG. 13 is a schematic plan view of the front side belt portion 321 . 14A and 14B are explanatory diagrams of the gluteus medius 360 .

The front belt portion 321 and the rear belt portion 322 have a low pressure region 330 and a high pressure region 340 overlapping the locking portion 324 in the up-down direction in the waist regions 3211 and 3221 (refer to FIG. 9 ).

The low pressure region 330 is a region where the stretchable nonwoven fabric sheet 3215 (3225) is arranged between the skin side sheet 3213 (3223) and the non-skin side sheet 3214 (3224). The high pressure region 340 is a region in which the stretchable nonwoven fabric sheet 3215 (3225) and the stretchable film 343 are arranged between the skin side sheet 3213 (3223) and the non-skin side sheet 3214 (3224). The stretchable film 343 is a sheet that stretches at least in the left-right direction of the diaper 300 . Therefore, the low-pressure area 330 and the high-pressure area 340 have elasticity in the left-right direction.

The stretchable film 343 may be a sheet-like stretchable elastic member having a uniform thickness, and may be obtained, for example, by melting an elastomer resin such as polyurethane or styrene. In addition, the stretchable film may be, for example, a film in which a polyolefin layer is integrally formed on the upper surface and the lower surface of the elastomer layer. If this type of stretchable film is used, considering that the polyolefin layer does not have stretchability, stretchability can be provided by stretching the film in advance. Providing a polyolefin layer on the upper surface has the advantage of facilitating welding to a nonwoven sheet made of polyolefin fibers.

Due to the provision of the stretchable film 343, the confinement pressure of the high pressure region 340 is greater than the confinement pressure of the low pressure region 330 when the diaper is worn. Specifically, the force required to extend the vertical unit width portion of the high pressure region 340 by a unit length in the horizontal direction is greater than the force required to extend the vertical unit width portion of the low pressure region 330 by a unit length in the horizontal direction. . In other words, the contraction force per unit width in the left-right direction in the high pressure region 340 is greater than the contraction force per unit width in the left and right direction in the low pressure region 330, and the high pressure region 340 is strongly pressed against the wearer.

Note that the stretchable film 343 is not limited to be provided over the entire range of the high pressure region 340 . For example, as shown in FIGS. 12 and 13 , the stretchable films 343A to 343F and 343a to 343f extending in the left-right direction may be arranged side by side at intervals in the vertical direction. In this case, the high pressure region 340 is the upper end of the elastic member ( 343A, 343 a ) located at the highest position among the plurality of elastic members (here, the elastic film 343 ) in which each high pressure region 340 is formed , the lower ends of the telescopic members (343F, 343f) at the lowest position, and the area surrounded by a pair of locking portions 324 (areas surrounded by 3a, 3b, 3c, and 3d in FIG. 12, and areas surrounded by 3e, 3f, 3g in FIG. 13 ) and the area surrounded by 3h).

In addition, the waist elastic thread 326 is provided in the upper end part of the front side belt part 321 and the back side belt part 322 of this embodiment, and the stretchable nonwoven fabric sheets 3215 and 3225 and the stretchable film 343 are not provided. In addition, the stretchable nonwoven fabric sheets 3215 and 3225 are arranged in the entire area below the waist elastic thread 326 . However, not limited to this configuration, a configuration is possible in which the stretchable nonwoven fabric sheets 3215 and 3225 overlap the waist elastic threads 326 in the upper end portions of the front and rear belt portions 321 and 322 .

In addition, in the waist region 3221 of the rear belt portion 322 , the region below the high pressure region 340 is the low pressure region 330 . However, in the waist region 3211 of the front side belt portion 321 , the region above the high pressure region 340 and below the waist elastic line 326 is the low pressure region 330 . Note that if the rear side belt portion 322 has the leg elastic lines 327, the low pressure region 330 does not include the portion where the leg elastic lines 327 are provided. Note that, in FIGS. 9 and 12 , to facilitate understanding, the portion where the leg elastic line 327 is provided is surrounded by a thick line like the low pressure region 330 .

In addition, a known method can be used to compare the force required to extend the vertical unit width portion of the high pressure region 340 by a unit length in the horizontal direction and the vertical unit width portion of the low pressure region 330 to extend horizontally in the horizontal direction. The force required for a long unit length. For example, all the high-pressure regions 340 and the low-pressure regions 330 are cut out from the rear-side belt portion 322 and the front-side belt portion 321 as samples. Then, the average value of the vertical lengths of the samples was calculated. Then, both ends of each sample in the left-right direction of the diaper 300 were clamped in the chucks of the tension tester. Then, the sample is elongated by pulling the chuck apart a unit length, and the load at this time is measured. Then, the load of each sample was divided by the average vertical length of the sample, and the obtained value was used for comparison. Note that if the region including the portion where the leg elastic thread 327 is provided (the area indicated by the bold line in FIG. 12 ) is cut out as the low pressure area 330 of the rear side belt portion 322 , the leg elastic thread 327 is not applied The load is measured in the state of elongation force.

In the following description, the low-pressure area 330 and the high-pressure area 340 of the rear-side belt portion 322 are referred to as “rear-side low-pressure area 331 ” and “rear-side high-pressure area 341 ”, respectively, and the low-pressure area of the front-side belt portion 321 The pressure region 330 and the high pressure region 340 are referred to as the "front low pressure region 332" and the "front high pressure region 342", respectively.

As shown in FIGS. 9 and 12 , the rear-side high-pressure region 341 continuously extends in the left-right direction between the paired locking portions 324 . If the end of the rear-side high-pressure region 341 is located at the edge portion of the leg opening 300b, the rear-side high-pressure region 341 widens the leg opening 300b when contracted, and the restraint pressure (contact pressure of the rear-side high-pressure region 341) ) decreases. In contrast, in the present embodiment, the rear-side high-pressure region 341 is connected to the front-side belt portion 321 via the locking portion 324 . This makes it possible to suppress a decrease in the confinement pressure of the rear-side high-pressure region 341 .

In addition, the vertical length of the rear high pressure region 341 is larger in the left and right end portions 3411 of the rear high pressure region 341 than in the central portion 3412 (L31>L32), which is different from that in the central portion 3412. In contrast, the lower end 341 a of the rear-side high pressure portion 341 is at a lower position in the end portion 3411 .

In other words, as shown in FIG. 14A , the rear high pressure region 341 is configured to conform to the shape of the gluteus medius 360 of the wearer (human body). Thus, when the diaper 300 is being worn, the rear high pressure region 341 can restrain the gluteus medius 360 of the wearer and can support the movement of the gluteus medius 360. As a result, the wearer's pelvis is stabilized during movement such as walking, and the wearer's movement (walking) can be supported.

Note that it suffices to satisfy the positional relationship of the lower end ( 341 a ) and the vertical lengths ( L31 , L32 ) at least at the left and right ends and the center of the rear high pressure region 341 . These conditions are preferably satisfied in both end portions 3411 extending from both ends of the rear side high pressure region 341 in the left-right direction by 1/3 of the total length and the central portion 3412 therebetween.

In addition, it is desirable to compare the length and position of the rear high pressure region 341 in a state in which the rear belt portion 322 is stretched so as to eliminate wrinkles. Specifically, this is a state in which the rear side belt portion 322 is matched or approximated to the size of the constituent members of the rear side belt portion 322 (eg, the skin side panels 3223 and the like) and the size of the independent state. Similarly, this applies to other length and position comparisons described later.

Moreover, in the left-right direction center part of the rear side belt part 322, the rear side low pressure area|region 331 is arrange|positioned so that the lower side of the rear side high pressure area|region 341 may be adjoined. Specifically, it is desirable that the rear low-pressure region 331 is located at least in the center of the rear belt portion 322 in the left-right direction, and preferably, the rear low-pressure region 331 is located at the total length extending from both ends of the rear belt portion 322 in the left-right direction. The central part between the two ends of the length of 1/3 of the length.

As shown in Fig. 14A, only the gluteus maximus 361 (which does not overlap with the gluteus medius 360) is located in the center of the buttocks region of the wearer (human body). During movements such as sitting and walking, only the central portion of the hip region where the gluteus maximus 361 is located is greatly extended and contracted. For this reason, when the rear high pressure region 341 is located in the center of the buttocks region, friction between the wearer and the diaper 300 is likely to occur, and the comfort of the diaper 300 is reduced. In contrast, in the present embodiment, the rear low pressure region 331 is arranged so as to be aligned with the central portion of the buttocks region. For this reason, the central portion of the hip region where the skin and muscles are greatly stretched is not over-constrained, and the friction between the wearer and the diaper 300 can be reduced, and the comfort of the diaper 300 can be improved.

In addition, the rear low-pressure region 331 can be properly fitted at the center of the buttocks region due to its stretchability, and displacement of the diaper 300 can be suppressed. As a result, the state in which the rear high pressure region 341 abuts against the gluteus medius is maintained, and support for the wearer's movement (walking support) is maintained.

In addition, it is preferable that the lower end 341 a of the rear high pressure region 341 is inclined downward from the left-right direction central portion 3412 of the rear high pressure region 341 toward both end portions 3411 . In other words, it is preferable that the vertical length of the rear high-pressure region 341 is gradually increased from the left-right central portion 3412 of the rear high-pressure region 341 toward both end portions 3411 .

According to this configuration, the shape of the rear high pressure region 341 more closely conforms to the shape of the wearer's gluteus medius 360 (FIG. 14A). Therefore, this improves the ability of the rear high pressure area 341 to support the gluteus medius 360, ie, the ability to support the wearer's movement (ability to support walking). Note that although in the example shown in FIG. 12 , the lower end 341a of the rear side high pressure region 341 is inclined in a smooth curve, it is not limited to this, for example, the lower end 341a may be inclined in a straight shape or a stepped shape.

Moreover, it is preferable that the rear side high pressure area 341 is arrange|positioned so that it may not overlap the rear side part of the absorptive core 311 in the front-back direction (the thickness direction of the rear side belt part 322). According to this configuration, it can be suppressed that the absorptive core 311 is contracted in the left-right direction by the rear-side high-pressure region 341 having a strong shrinkage force and a concavo-convex shape is formed in the thick absorptive core 311 . In other words, the flatness of the absorbent core 311 is maintained to prevent discomfort during use, so that the comfort of the diaper 300 can be improved. Note that the rear side portion of the absorptive core 311 is a portion located on the rear side (back side) of the center in the longitudinal direction of the absorptive core 311 . The above configuration is not limited, and the rear side high pressure region 341 and the absorbent core 311 may overlap each other.

Moreover, it is preferable that the rear side low pressure area|region 331 is arrange|positioned at least between the lower end 341a of the rear side high pressure area|region 341, and the upper end 311a of the rear side part of the absorptive core 311. According to this configuration, the rear low pressure region 331 can appropriately fit the wider range of the wearer's gluteus maximus. This makes it possible to suppress displacement of the diaper 300 while being worn.

Further, it is desirable that the rear low-pressure region 331 extends in the left-right direction not only in the left-right direction central portion of the rear-side belt portion 322 but also in at least a part of both end portions. Specifically, it is desirable that the rear low-pressure region 331 extends to at least the two ends extending from both ends in the left-right direction of the rear belt portion 322 by a length of 1/3 of the total length. part. More preferably, the rear low pressure region 331 extends between the pair of locking portions 324 . According to this configuration, the rear low pressure region 331 can appropriately fit the wider range of the wearer's gluteus maximus.

In addition, as shown in FIG. 13 , it is desirable that the stretchable film 343 (front stretchable member) of the front high pressure region 342 continuously extends in the left-right direction between the paired locking portions 324 . Desirably, the rear side high pressure area 341 is connected to the front side high pressure area 342 in the locking portion 324 . In other words, it is desirable that the positions of the rear side high pressure region 341 and the front side high pressure region 342 are partially or completely aligned with each other in the upper and lower direction in the locking portion 324 .

According to this configuration, the annular expansion-contraction region is formed by the rear-side high-pressure region 341 and the front-side high-pressure region 342 . Therefore, the diaper 300 is fitted around the waist of the wearer, and displacement of the diaper 300 can be suppressed. In addition, the restraining pressure of the posterior high pressure area 341 is increased, thereby improving the ability of the posterior high pressure area 341 to support the gluteus medius 360 .

In the rear high pressure region 341 and the front high pressure region 342 of the present embodiment, the stretchable films 343A to 343F (rear elastic members) and 343a to 343f (front elastic members) are spaced apart in the up-down direction Configured side by side. In this case, it is desirable that, in the locking portion 324, the highest stretchable films 343A and 343a are connected to each other, and the lowest stretchable films 343F and 343f are connected to each other. This configuration achieves the above-described effects. Preferably, the second stretchable films 343B and 343b from the top, the third stretchable films 343C and 343c from the top, the fourth stretchable films 343D and 343d from the top, and the fifth stretchable from the top The sexual membranes 343E and 343e are also connected to each other in the locking portion 324 .

Note that the above configuration is not limited, and the rear high pressure region 341 and the front high pressure region 342 (front elastic member) may be misaligned in the up-down direction in the locking portion 324 . In addition, a configuration in which the front side belt portion 321 does not include the high pressure region 340 or does not include an elastic member is possible. For example, a structure in which the stretchable film 343 is not provided on the front side belt portion 321 and only the stretchable nonwoven fabric sheet 3215 is provided is possible. In addition, a linear elastic member such as an elastic thread or the like may be provided instead of the stretchable film 343 or the stretchable nonwoven fabric sheet 3215. In these cases, it is also desirable that the stretchable nonwoven fabric sheet 3215 or the pair of linear elastic members extend continuously in the left-right direction between the paired locking portions 324 and are connected to the rear high pressure region 341 in the locking portions 324 . This configuration achieves the above-described effects.

Additionally, as shown in FIG. 14B, the gluteus medius 360 extends from the dorsal side to the side of the human body. For this reason, as shown in FIG. 13 , it is desirable that the vertical length of the front high pressure region 342 be larger in the left and right end portions 3421 of the front high pressure region 342 than in the central portion 3422 (L33 >L34), and the upper end 342a of the front side high pressure region 342 is located higher in the end portion 3421 than in the central portion 3422.

In this way, if the both ends 3421 of the front side high pressure area 342 in the left and right direction are located at relatively high positions and have a longer length ( L33 ) in the up and down direction, the front side high pressure area 342 can be located on the wearer's side The area is in close contact with the gluteus medius. To this end, a wider range of the wearer's gluteus medius may be constrained by the posterior high pressure area 341 and the anterior high pressure area 342 . Therefore, this improves the ability to support the movement of the wearer (the ability to support walking).

On the other hand, the left-right direction central portion 3422 of the front high-pressure region 342 is located at a relatively low position, and is located below the bulge of the wearer's abdominal region. For this reason, the wearer's abdominal region is not unduly restrained by the front high pressure region 342, so that the comfort of the diaper 300 can be improved.

Note that it suffices to satisfy the above-described positional relationship of the vertical lengths ( L33 , L34 ) and the upper end ( 342 a ) at least at the left and right ends and the center of the front high pressure region 342 . These conditions are preferably satisfied in both end portions 3421 extending from both ends in the left-right direction of the front side high pressure region 342 by 1/3 of the total length and the central portion 3422 therebetween. However, the shape of the front side high pressure region 342 is not limited to the above description.

Moreover, in the center part of the left-right direction of the front side belt part 321, the front side low pressure area|region 332 is arrange|positioned so that the upper side of the front side high pressure area|region 342 may be adjacent. Specifically, it suffices for the front low pressure region 332 to be located at least at the center of the front belt portion 321 in the left-right direction. /3 the length of the center between the two ends. According to this configuration, the front low pressure region 332 can be properly fitted to the abdominal region of the wearer, and displacement of the diaper 300 can be suppressed.

Moreover, it is preferable that the front side high pressure area|region 342 is arrange|positioned so that it may not overlap with the front side part of the absorptive core 311 in the front-back direction. According to this structure, it can suppress that the front side high pressure area|region 342 shrinks the absorptive core 311 in the left-right direction. Therefore, the flatness of the absorbent core 311 is maintained to prevent discomfort during use, so that the comfort of the diaper 300 can be improved. Note that the front side portion of the absorptive core 311 is a portion located on the front side (abdominal side) of the center in the longitudinal direction of the absorptive core 311 . The above configuration is not limited, and the front side high pressure region 342 and the absorbent core 311 may overlap each other.

In addition, it is preferable that the stretchable films 343A to 343F and 343a to 343f provided in the rear high pressure region 341 and the front high pressure region 342 are arranged side by side at intervals in the vertical direction. The portion between the stretchable films 343 adjacent in the up-down direction has fewer sheets than the portion where the stretchable films 343 are provided, and thus has better air permeability in the thickness direction. Therefore, the moist air in the diaper 300 can be discharged to the non-skin side in the thickness direction through the portion between the adjacent stretchable films 343, and the steam in the diaper 300 can be suppressed. Therefore, the comfort of the diaper 300 can be improved.

In particular, the air permeability in the thickness direction is lower in the case where the high pressure region 340 includes the stretchable film 343 than in the case where the stretchable nonwoven fabric sheet or the linear elastic member is included. For this reason, it is desirable that the plurality of stretchable films 343 are arranged side by side at intervals in the up-down direction. Note that the above configuration is not limited, and the stretchable film 343 may be provided over the entire range of the high pressure region 340 .

In addition, in the rear-side high-pressure region 341 and the front-side high-pressure region 342, it is desirable that the stretchable films 343A to 343F and 343a to 343f adjacent in the up-down direction are compared with those in the central portions 3412 and 3422 The gap therebetween (length in the up-down direction) is larger in the left-right direction end portions 3411 and 3421 . According to this configuration, the vertical lengths of the left and right end portions 3411 and 3421 are longer in the rear high-pressure region 341 and the front high-pressure region 342 than in the central portions 3412 and 3422 (L31>L32, L33 >L34). Therefore, the posterior high pressure area 341 and the anterior high pressure area 342 may fit around the gluteus medius.

Moreover, it is preferable that the elastic member (here, the elastic film 343) arrange|positioned in the rear side high pressure area|region 341 and the front side high pressure area|region 342 is a sheet-like elastic member.

According to this configuration, the rear high pressure region 341 and the front high pressure region 342 are flat against the wearer's gluteus medius, and thus a wider range of the wearer's gluteus medius can be restrained. Therefore, this improves the ability to support the movement of the wearer (the ability to support walking). In addition, in order to obtain substantially the same restraint pressure as that of the sheet-like elastic member using the linear elastic member, it is necessary to increase the elongation ratio of the linear elastic member. In this case, the linear elastic members are in close contact locally with the wearer, thereby reducing the comfort of the diaper 300 .

Similarly, it is preferable that the stretchable members (here, stretchable nonwoven fabric sheets 3215 and 3225 ) arranged in the rear low-pressure region 331 and the front low-pressure region 332 are also sheet-like stretchable members. According to this configuration, the rear low pressure area 331 and the front low pressure area 332 are flat against the abdominal area and gluteus maximus of the wearer, thereby preventing local restraint of the abdominal area and gluteus maximus, and making it possible to improve the diaper 300 comfort. Note that a configuration in which a stretchable nonwoven fabric sheet is provided instead of the stretchable film 343 and two layers of stretchable nonwoven fabric sheets are provided in the high pressure region 340 is possible.

Note that the above configuration is not limited. For example, a configuration is possible in which the low-pressure region 330 is formed by arranging linear elastic members side by side at intervals in the up-down direction in a wide range of the front side belt portion 321 and the rear side belt portion 322, and by forming the low pressure region 330 on the linear elastic member Another stretchable member (for example, a stretchable film, a stretchable nonwoven fabric sheet, a linear elastic member, etc.) is stacked and arranged to form a high-pressure region 340 . In contrast, a configuration is possible by disposing a sheet-like stretchable member (for example, a stretchable film or a stretchable nonwoven sheet) in a wide range of the front-side belt portion 321 and the rear-side belt portion 322 The low pressure region 330 and the high pressure region 340 are formed by overlapping and arranging a linear elastic member on a sheet-like stretchable member. In addition, a configuration is possible in which the low pressure region 330 is formed by arranging a stretchable film in a wide range of the front side belt portion 321 and the rear side belt portion 322, and a sheet-like stretchable member is superimposed and arranged on the stretchable film. (eg, a stretchable film or a stretchable nonwoven sheet) forms the high pressure region 340 . Further, a configuration is possible in which the low-pressure area 330 and the high-pressure area 340 have the same configuration, and the elongation ratio of the elastic member in the high-pressure area 340 is set higher than that of the elastic member in the low-pressure area 330 elongation ratio.

In addition, it is desirable that the leg elastic threads 327 (stretch members) are arranged to extend along the pair of leg openings 300b of the diaper 300 . According to this configuration, the leg elastics 327 are in close contact with the wearer's legs (the contoured portion of the buttocks region), whereby the diaper 300 can be suppressed from being pulled too high when being put on or worn. As a result, the rear high pressure area 341 is maintained against the gluteus medius and support for the wearer's movement (walking support) is maintained. Note that instead of the elastic wire, a sheet-like stretchable member may be arranged to extend along the leg opening 1b. In addition, the above configuration is not limited, and the elastic members extending along the leg openings 1b may be omitted.

===Third Embodiment ===

Hereinafter, the third embodiment of the underpants-type disposable diaper will be described by taking the underpants-type disposable diaper for adults as an example. However, not limited to this, the pant-type disposable diaper of the present invention can be applied to a disposable diaper for children (baby), sanitary pants, and the like.

"Basic Structure of Diaper 500"

Fig. 15 is a schematic perspective view of a pants-type disposable diaper 500 (hereinafter, also referred to as a diaper 500). Figure 16 is a schematic plan view of the diaper 500 in a deployed and extended state. FIG. 17 is a schematic cross-sectional view taken along line I-I (center in the left-right direction) in FIG. 16 . 18A is a diagram showing an example of a joint portion 530 of the front side belt portion 521 and the rear side belt portion 522 , and FIG. 18B is a schematic cross-sectional view of the front side belt portion 521 and the rear side belt portion 522 .

The diaper 500 has an up-down direction, a left-right direction, and a front-rear direction that intersect with each other, and has a thickness direction in which members overlap each other as shown in FIG. 17 . In the up-down direction, the side corresponding to the wearer's torso is the upper side, and the side corresponding to the wearer's crotch is the lower side. In the front-rear direction, the side corresponding to the wearer's abdomen is the front side, and the side corresponding to the wearer's back side is the rear side. In the thickness direction, the side in contact with the wearer is the skin side, and the opposite side is the non-skin side.

The diaper 500 includes an absorbent body 510 and an outer body 520 located on the non-skin side of the absorbent body 510 . The outer body 520 includes a front belt portion 521 (belt portion) located on the wearer's abdominal side, a rear side belt portion 522 (belt portion) located on the wearer's back side, and connecting the front side belt portion 521 and the rear side belt. The crotch portion 523 of the portion 522.

Note that although the outer body 520 of the diaper 500 according to the present embodiment is composed of three members (the front side belt portion 521, the rear side belt portion 522, and the crotch portion 523), it is not limited thereto. For example, the front side strap portion 521, the rear side strap portion 522, and the crotch portion 523 may be constructed of a single continuous member. In addition, the crotch portion 523 may be omitted.

When the diaper 500 is in the unfolded state shown in FIG. 16 , the front belt part 521 is located at one end side in the longitudinal direction of the absorptive main body 510 , and the rear side belt part 522 is located at the other end side in the longitudinal direction of the absorptive main body 510 . When the absorptive main body 510 of the diaper 500 in the unfolded state is folded once at approximately the center in the longitudinal direction, the left and right ends of the front belt portion 521 and the left and right ends of the rear belt portion 522 are locked in the When in the pair of locking portions 524, the pant-type state shown in FIG. 15 is achieved. In other words, the longitudinal direction of the absorptive main body 510 is aligned with the vertical direction of the diaper 500, and the front belt portion 521 and the rear belt portion 522 are connected in an endless manner, thereby forming the waist opening 500a at the upper end and forming a Opening 500b for the legs. Note that the locking method by the locking portion 524 is, for example, welding, bonding using an adhesive, or the like.

As shown in FIG. 17 , the absorptive main body 510 includes an absorptive core 511 , a liquid-permeable topsheet 512 on the skin side of the absorptive core 511 , and a backsheet 513 on the non-skin side of the absorptive core 511 . The back sheet 513 of the present embodiment has a two-layer structure including a liquid-impermeable sheet 513a and a hydrophobic liquid-permeable sheet (for example, a hydrophobic non-skin sheet) disposed on the non-skin side of the liquid-impermeable sheet 513a. spun cloth) 513b.

The absorptive core 511 is a member that absorbs and retains excretion fluid such as urine, and is formed, for example, by liquid-absorbent fibers such as pulp or the like containing a superabsorbent polymer (SAP). Although not shown, the outer peripheral surface of the absorptive core 511 may be covered with a liquid-permeable sheet made of tissue paper, nonwoven fabric, or the like.

As shown in FIG. 16 , the front side belt portion 521 and the rear side belt portion 522 respectively include waist regions 5211 and 5221 as portions overlapping the locking portion 524 in the up-down direction and a crotch region 5212 below the waist regions 5211 and 5221 and 5222.

The crotch regions 5212 and 5222 are substantially trapezoidal, and their lateral widths (lengths in the left-right direction) decrease toward the lower side. In addition, the crotch region 5222 of the rear belt portion 522 is larger than the front belt portion 521 so as to be able to cover the buttocks region of the wearer.

As shown in FIG. 17, the front side belt portion 521 and the back side belt portion 522 respectively include skin side panels 5213 and 5223, non-skin side panels 5214 and 5224, and a stretchable nonwoven between the skin side panels and the non-skin side panels Sheets 5215 and 5225. The skin side panels 5213 and 5223 and the non-skin side panels 5214 and 5224 may be soft sheets made of spunbond nonwoven fabric, SMS nonwoven fabric, or the like. Additionally, the skin side panels 5213 and 5223 and the non-skin side panels 5214 and 5224 are substantially non-stretchable non-stretch panels.

The stretchable nonwoven fabric sheets 5215 and 5225 are sheets that stretch at least in the left-right direction of the diaper 500 . In addition, the stretchable nonwoven fabric sheets 5215 and 5225 are nonwoven fabric sheets containing stretchable fibers and non-stretchable fibers (ie, extensible fibers whose shrinkability is lower than that of the stretchable fibers).

As an example of the stretchable nonwoven fabric sheets 5215 and 5225, there can be provided a nonwoven fabric sheet made by subjecting stretchable fibers and non-stretchable fibers to appropriate elongation treatment (eg, gear elongation); The elastic fiber is made of polyurethane elastomer (polyurethane elastomer is an elastic thermoplastic elastomer), and the non-stretch fiber is made of polyolefin resin such as polypropylene (PP) (polyolefin resin is a non-elastic thermoplastic resin) production. Note that the stretching treatment may be stretching treatment performed in mutually orthogonal directions (left-right direction and vertical direction of the diaper 500), or stretching treatment performed only in a predetermined direction (left-right direction of the diaper 500). Note that in the case where the elongation treatment is performed only in a predetermined direction, stretchability is exhibited in the predetermined direction. However, not all fibers are necessarily oriented in the predetermined direction, and therefore stretchability is also exhibited in the direction orthogonal to the predetermined direction.

The skin side sheet 5213 (5223), the non-skin side sheet 5214 (5224), and the stretchable nonwoven fabric sheet 5215 (5225) are made through the joint 530 in a state where the stretchable nonwoven fabric sheets 5215 and 5225 are stretched in the left-right direction. ) combined. As shown in FIG. 18A , it is desirable that the joints 530 are spread in the left-right direction and the up-down direction of the diaper 500 . According to this configuration, when the diaper 500 is shrunk, the portions of the skin side panels 5213 and 5223 and the non-skin side panels 5214 and 5224 between the joints 530 are gathered so as to form protrusions that protrude outward in the thickness direction. On the other hand, the stretchable nonwoven fabric sheets 5215 and 5225 are expanded in the thickness direction due to the fact that the stretchable fibers shrink when the non-stretchable fibers are brought together (aggregated). For this reason, the protrusions are supported by the fibers of the stretchable nonwoven fabric sheets 5215 and 5225 and are not easily collapsed, and the protrusions have high cushioning capacity. This makes it possible to improve the texture of the front side belt portion 521 and the rear side belt portion 522 on the wearer's skin. In addition, the diaper 500 can also be visually given a soft impression to the user.

Similar to the front belt portion 521 and the rear belt portion 522, the crotch portion 523 also has a structure in which a stretchable nonwoven fabric sheet 5233 is arranged between the skin side sheet 5231 and the non-skin side sheet 5232. However, the structure of the crotch portion 523 is not particularly limited to this, and for example, a structure in which the skin side sheet 5231 is not provided and the stretchable nonwoven fabric sheet 5233 is provided between the absorptive main body 510 and the non-skin side sheet 5232 is possible.

"High Pressure Area 560"

FIG. 19 is a schematic plan view of the front side belt portion 521 . FIG. 20 is a schematic plan view of the rear side strap portion 522 .

The front side belt portion 521 and the rear side belt portion 522 include a waist stretch region 540 , a low pressure region 550 and a high pressure region 560 in the waist regions 5211 and 5221 overlapping the locking portion 524 in the up-down direction.

The waist stretch region 540 is a stretch region extending along the edge of the waist opening 500a and is formed by elastic threads 541 that expand and contract in the left-right direction of the diaper 500 and are arranged side by side at intervals in the up-down direction. The waist stretch region 540 may be formed not to include the stretchable nonwoven fabric sheets 5215 and 5225 shown in FIG. 17 , or may include stretchable nonwoven fabric sheets and elastic threads 541 (not shown) overlapping each other.

The low-pressure region 550 and the high-pressure region 560 are regions arranged below the waist stretchable region 540, are adjacent to each other, and have stretchability in the left-right direction. The low pressure region 550 is a region in which the stretchable nonwoven fabric sheets 5215 and 5225 are arranged between the skin side sheets 5213 and 5223 and the non-skin side sheets 5214 and 5224 . The high pressure region 560 is a region where the stretchable nonwoven fabric sheets 5215 and 5225 and the stretchable film 565 are arranged between the regions between the skin side sheets 5213 and 5223 and the non-skin side sheets 5214 and 5224 . The stretchable film 565 is a sheet that stretches at least in the left-right direction of the diaper 500 .

The stretchable film 565 may be a sheet-like stretchable elastic member having a uniform thickness, for example, the stretchable film 565 may be obtained by melting an elastomer resin such as polyurethane or styrene. In addition, for example, the stretchable film may be a film in which a polyolefin layer is integrally formed on the upper surface and the lower surface of the elastomer layer. If this type of stretchable film is used, considering that the polyolefin layer does not have stretchability, stretchability is provided by stretching the film in advance. Providing a polyolefin layer on the upper surface has the advantage of facilitating welding to a nonwoven sheet made of polyolefin fibers.

Due to the provision of the stretchable film 565, the confinement pressure of the high pressure region 560 is greater than the confinement pressure of the low pressure region 550 when the diaper is worn. Specifically, the force required to extend the vertical unit width portion of the high pressure region 560 by a unit length in the horizontal direction is greater than the force required to extend the vertical unit width portion of the low pressure region 550 by a unit length in the horizontal direction. . In other words, in the high pressure region 560, the contraction force acting per unit width in the left and right directions is greater than the contraction force acting per unit width in the left and right directions in the low pressure region 550, and the high pressure region 560 is strongly pressed against the wearer. user.

Note that the stretchable membrane 565 is not limited to be provided over the entire range of the high pressure region 560 . For example, as shown in FIGS. 19 and 20 , the stretchable films 565a to 565f and 565A to 565F extending in the left-right direction may be arranged side by side at intervals in the vertical direction. In this case, each high pressure region is the upper end of the stretchable film 565 located at the highest position and the stretchable film 565 located at the lowest position among the plurality of stretchable films 565 arranged in the same portion (same track). The lower end and the area surrounded by the pair of locking portions 524 .

More specifically, as shown in FIG. 19, the front side belt portion 521 includes a "first high pressure area 561" (area surrounded by 5a, 5b, 5c and 5d) and a "second high pressure area 562" (by 5e, 5f, 5g and 5h), the "first high pressure region 561" includes three stretch films 565a to 565c forming a downwardly protruding shape, and the "second high pressure region 562" includes in the left-right direction of the diaper 500 Three stretchable membranes 565d to 565f on the upper level.

In addition, as shown in FIG. 20, the rear side belt portion 522 includes a "third high pressure area 563" (an area surrounded by 5i, 5j, 5k and 5l) and a "fourth high pressure area 564" (by 5m, 5n, 5o and 5p surrounding area), the "third high pressure area 563" includes three stretch films 565A to 565C forming an upwardly protruding shape, and the "fourth high pressure area 564" includes horizontal in the left-right direction of the diaper 500. Three stretch films 565D to 565F.

Moreover, in the front side belt part 521 and the back side belt part 522 of this embodiment, the stretchable nonwoven fabric sheets 5215 and 5225 are arrange|positioned in the whole area below the waist expansion-contraction area|region 540 (refer FIG. 17). To this end, one low pressure region 550 includes the waist region 5211 of the front side belt portion 521 and regions other than the first high pressure region 561 and the second high pressure region 562 in the region below the waist stretch region 540 . Similarly, the other low pressure region 550 includes the waist region 5221 of the rear belt portion 522 and regions other than the third high pressure region 563 and the fourth high pressure region 564 in the region below the waist stretch region 540 . Note that if the front side strap portion 521 and the rear side strap portion 522 include the leg elastic lines 527 extending along the leg openings 500b, the low pressure region 550 does not include the portion where the leg elastic lines 527 are provided.

Note that a known method can be used to compare the force required to extend the vertical unit width portion of the high-pressure region 560 by a unit length in the left-right direction and the vertical-unit width portion of the low-pressure region 550 to extend in the left-right direction. The force required for a long unit length. For example, all or part of the high pressure area 560 and the low pressure area 550 are cut out from the rear side strap portion 522 and the front side strap portion 521 as samples. Then, the average value of the vertical lengths of the samples was calculated. Then, both ends of each sample in the left-right direction of the diaper 500 were clamped in the chucks of the tension tester. Then, the sample is elongated by pulling the chuck apart a unit length, and the load at this time is measured. Then, the load of each sample was divided by the average vertical length of the sample, and the obtained value was used for comparison. Note that if a region including a portion where the leg elastic wires 527 are provided is cut out as the low pressure region 550, the load is measured in a state in which the leg elastic wires 527 do not apply an elongation force.

In addition, it is sufficient that the confinement pressure of the high-pressure region 560 is higher than that of the low-pressure region 550, and the structure in which the stretchable film 565 overlaps the stretchable nonwoven fabric sheets 5215 and 5225 is not limited. For example, a configuration is possible in which the low pressure region 550 is formed by arranging linear elastic members side by side at intervals in the up-down direction in a wide range of the front side belt portion 521 and the rear side belt portion 522, and by forming the low pressure region 550 on the linear elastic member Another stretchable member (for example, a stretchable film, a stretchable nonwoven fabric sheet, a linear elastic member, etc.) is stacked and arranged to form a high-pressure region 560 . In contrast, a configuration is possible by disposing a sheet-like stretchable member (for example, a stretchable film or a stretchable nonwoven sheet) in a wide range of the front-side belt portion 521 and the rear-side belt portion 522 The low pressure region 550 and the high pressure region 560 are formed by overlapping and arranging a linear elastic member on a sheet-like stretchable member. In addition, a configuration is possible in which the low-pressure region 550 is formed by arranging a stretchable film in a wide range of the front-side belt portion 521 and the rear-side belt portion 522, and a sheet-like stretchable member is superimposed and arranged on the stretchable film. (eg, a stretchable film or a stretchable nonwoven sheet) forms the high pressure region 560 . Further, a configuration is possible in which the low-pressure area 550 and the high-pressure area 560 have the same configuration, and the elongation ratio of the elastic member in the high-pressure area 560 is set to be higher than that in the low-pressure area 550 The elongation ratio of the sexual member.

As described above, the high-pressure region 560 is provided in portions of the front-side belt portion 521 and the rear-side belt portion 522 . To this end, high pressure areas 560 may constrain portions of the wearer that are desired to be restrained (eg, portions of the diaper 500 that prevent slippage and portions that support movement of the wearer). The low pressure region 550 is also stretchable. To this end, the low pressure area 550 may suitably be in intimate contact with portions of the wearer that are not intended to be restrained. Accordingly, the fit of the diaper 500 can be improved while also preventing excessive restraint of the wearer.

Further, in the diaper 500 of the present embodiment, the skin side sheets 5213 and 5223, the non-skin side sheets 5214 and 5224, and the stretchable nonwoven fabric sheets 5215 and 5225 are white sheets, and the stretchable film 565 is a colored sheet (for example, a Pieces colored in purple, blue, pink, etc.). In other words, the color of the stretchable film 565 is different from that of the other sheets. According to this configuration, when the front-side belt portion 521 and the rear-side belt portion 522 are viewed from at least one of the non-skin side and the skin side, the color of the portion of the high-pressure area 560 including the stretchable membrane 565 is the same as that of the low-pressure area 550 . Different colors.

By making the high pressure areas 560 visible in this manner, the user of the diaper 500 (either the wearer or the caregiver) can identify the location of the high pressure areas 560 on the diaper 500 . To this end, while adjusting the pull-up position of the diaper 500, the user can check whether the high pressure area 560 is located in the portion of the wearer to be restrained. Thus, the diaper 500 is correctly placed in the wearer's proper position, and the effect of the high pressure area 560 is obtained (preventing the diaper 500 from sliding down, supporting the wearer's movement, etc.). The comfort of the diaper 500 may also be prevented from being reduced by the high pressure areas 560 being located in parts of the wearer that are not to be restrained (eg, the ridges of the buttocks area and the lower abdominal area).

More preferably, when the front belt portion 521 and the rear belt portion 522 are viewed from at least one of the non-skin side and the skin side, the color of the contour portion of the high pressure region 560 in the vertical direction of the diaper 500 and the low pressure The colors of the regions 550 are different. For example, in the case of the first high pressure region 561 of the front belt portion 521, the colored stretchable film 565a is located at the upper end portion, and the colored stretchable film 565c is located at the lower end portion. In the second high pressure area 562 to the fourth high pressure area 564, the colored stretchable films 565 are also similarly located at the upper and lower ends.

According to this configuration, the boundary between the high-pressure area 560 and the low-pressure area 550 is clear, and the user can more easily recognize the position of the high-pressure area 560 . Therefore, the diaper 500 is easily put on correctly in the proper position of the wearer.

Note that it suffices that at least a part of the high pressure area 560 has a different color than the low pressure area 550 , and that a part of the high pressure area 560 other than the outline part may have a different color, or the entire high pressure area 560 may have a different color different color. In addition, the coloring of the high pressure region 560 is not limited. In other words, a configuration is possible in which the material constituting the high pressure region 560 is white, and the material constituting the low pressure region 550 is colored. In addition, the high pressure area 560 and the low pressure area 550 may have mutually different colors other than white.

FIG. 21 is a table showing experimental results regarding the visibility of the high pressure region 560 . Experiments were conducted on the case where the degree of color difference between the high pressure area 560 and the low pressure area 550 is required in order to identify the position of the high pressure area 560 . First, Samples 1 to 6 having belt portions of different configurations were prepared. Samples 1 to 6 have the following configurations.

In Sample 1, spunbond nonwoven sheets having a basis weight of 27 g/m ² were used as the skin side sheets 5213 and 5223 and the non-skin side sheets 5214 and 5224. The stretchable nonwoven sheets 5215 and 5225 had a basis weight of 28 g/m ² and an elongation ratio of 2.3. In addition, a dark beige stretchable film 565 is arranged in a portion between the non-skin side sheets 5214 and 5224 and the stretchable nonwoven fabric sheets 5215 and 5225. The stretchable film 565 was configured as shown in Figure 16 (this also applies similarly to other samples).

The configuration of Sample 2 was the same as that of Sample 1, except that the color of the stretchable film 565 was light beige.

In Sample 3, spunbond nonwoven sheets having a basis weight of 20 g/m ² were used as the skin side sheets 5213 and 5223 and the non-skin side sheets 5214 and 5224. The stretchable nonwoven sheets 5215 and 5225 had a basis weight of 28 g/m ² and an elongation ratio of 2.3. In addition, a dark beige stretchable film 565 is arranged in a portion between the non-skin side sheets 5214 and 5224 and the stretchable nonwoven fabric sheets 5215 and 5225.

The configuration of Sample 4 was the same as that of Sample 3, except that the color of the stretchable film 565 was light beige.

In Sample 5, a spunbond nonwoven sheet having a basis weight of 19 g/m ² and a lower content of white pigment (titanium oxide) than in Samples 1 to 4 was used as the skin side sheets 5213 and 5223 and the non-skin side sheet 5214 and 5224. The stretchable nonwoven sheets 5215 and 5225 had a basis weight of 28 g/m ² and an elongation ratio of 2.3. In addition, a dark beige stretchable film 565 is arranged in a portion between the non-skin side sheets 5214 and 5224 and the stretchable nonwoven fabric sheets 5215 and 5225.

The configuration of Sample 6 was the same as that of Sample 5, except that the color of the stretchable film 565 was light beige.

Then, the subjects were tested to evaluate whether the high pressure area 560 and the low pressure area 550 could be discriminated when the samples 1 to 6 were observed from the skin side and the non-skin side. Note that the test subjects evaluated Samples 1 to 6 in a state of being worn on an appropriately sized doll. The evaluation was performed in three levels, namely "○" (good) indicating that the high-pressure region 560 and low-pressure region 550 could be discriminated, "△" (average) indicating that they could be discriminated but with a certain degree of difficulty, and impossible They were judged as "x" (poor). Because the diaper 500 was an adult diaper, the test subjects (A to E) were five adult males/females between the ages of 30 and 50. The experiment was carried out in a room lit with fluorescent lamps (illuminance 407Lx), and the test objects were separated from the samples 1 to 6 by a horizontal distance of 40 cm.

In addition, the color difference ΔE* between the high pressure area 560 and the low pressure area 550 was measured for each of the samples 1 to 6 when observed from the skin side and the non-skin side.

The color difference ΔE* was measured using a color-difference meter (here, a colorimeter/color-difference meter ZE-6000 manufactured by Nippon Denshoku Kogyo Co., Ltd.). Reflection measurements were performed and the sample opening diameter was 30 mm. First, the measurement target sample (the belt portion of the diaper 500 ) is placed in a natural state. In the case of measuring the color difference ΔE* from the non-skin side, the non-skin side of the sample is arranged to face upward during the measurement, and in the case of measuring the color difference ΔE* from the skin side, the skin side of the sample is arranged to face up during the measurement superior.

Random locations (here five locations) located in the high pressure area 560 are measured to obtain the measurement results (a* and b* values in the L*a*b* color system). The average of the measurements at the locations is used as the measurement for this high pressure region 560 . Similarly, random locations (here five locations) located in the low pressure region 550 are measured to obtain the measurements (a* and b* values). The average of the measurements of the positions is used as the measurement of the low pressure area 550 .

In addition, when the color of only a part of the high pressure area 560 (the part where the color stretchable film 565 is arranged) is different from the color of the low pressure area 550 , the random measurement position is included in the color different from the color of the low pressure area 550 . The position in the section and the position in the section that is the same color as the low pressure area 550 .

Then, based on the measurement result of the high pressure area 560 and the measurement result of the low pressure area 550, the color difference ΔE* is calculated using the following expression.

ΔE*=[(Δa*)2+(Δb*)2]1/2

Note that the usual definition of color difference also includes the L* value (lightness). However, in the case of diapers, the L* value tends to change depending on the number of nonwoven sheets, thereby changing the color difference. For this reason, if the L* value is included when calculating the chromatic aberration, there is a risk that the chromatic aberration will be different from the actually observed chromatic aberration. For this reason, the L* value is excluded when calculating the color difference ΔE*.

The table in FIG. 21 shows the results of the above experiments. If all test subjects (A to E) can discriminate (○) high pressure area 560 and low pressure area 550 for a specific color difference ΔE* (sample), then "○" indicates the visibility of high pressure area 560 . Based on the results in this table, if the color difference ΔE* is "1.45" or more, the visibility of the high pressure region 560 is "○".

In view of this, when the front side belt portion 521 and the rear side belt portion 522 are viewed from at least one of the non-skin side and the skin side, when the distance between the high pressure region 560 and the low pressure region 550 is L*a*b *The difference in a* value in the color system is defined as Δa*, the difference in b* value in the L*a*b* color system between the high pressure area 560 and the low pressure area 550 is defined as Δb* , calculate the color difference ΔE* using the following expression.

ΔE*=[(Δa*)2+(Δb*)2]1/2

It is favorable if the color difference ΔE* is 1.45 or higher.

Therefore, the high-pressure area 560 and the low-pressure area 550 can be clearly discriminated, and the user can easily recognize the position of the high-pressure area 560 . Therefore, the diaper 500 is easily put on correctly in the proper position of the wearer. Note that the color difference ΔE* was measured using the method described in the above experiment or an equivalent method.

As described above, when the front belt portion 521 and the rear belt portion 522 are viewed from at least one of the non-skin side and the skin side, it is sufficient that the color of the high pressure region 560 is different from the color of the low pressure region 550 . However, it is more preferable that the color of at least a part of the high pressure area 560 is different from the color of at least a part of the low pressure area 560 when the front side belt part 521 and the rear side belt part 522 are viewed from the non-skin side (outside), That is, the color difference ΔE* between the high pressure area 560 and the low pressure area 550 is 1.45 or more.

According to this configuration, the user can easily recognize that the diaper 500 has the high-pressure area 560 , and can easily recognize the high-pressure area 560 when the user wears the diaper 500 . In addition, since the location of the high pressure area 560 can be identified from the non-skin side, the high pressure area 560 is easily located in the area of the wearer to be restrained. Therefore, the diaper 500 is easily put on correctly in the proper position of the wearer.

In addition, it is preferable that the color of the elastic member forming the high pressure region 560 (ie, the elastic film 565 of the present embodiment) is different from the color of the low pressure region 550 . According to this configuration, the area identified by the user as the high pressure area 560 matches the area where the confinement pressure is actually high. For this reason, the stretchable film 565 is easily positioned in the area of the wearer to be restrained, and the effect of the high pressure area 560 is easily obtained.

Note that the above configuration is not limited. The color of at least one other member (skin side panels 5213 and 5223 , non-skin side panels 5214 and 5224 , stretch nonwoven sheets 5215 and 5225 ) disposed in the high pressure area 560 may be different from the color of the low pressure area 550 . In this case, even if the stretchable film 565 is intermittently arranged in the up-down direction, for example, the entire area of the high-pressure region 560 can be colored. In addition, even if the stretchable film 565 is arranged over the entire area of the high-pressure area 560, a part (eg, an outline portion) of the high-pressure area 560 may be colored.

In addition, when the stretchable film 565 is colored, it is preferable that the stretchable film 565 is disposed on the non-skin side with respect to the material layers stacked in the thickness direction of the front belt portion 521 and the rear belt portion 522 . In this embodiment, as shown in FIG. 17 , the stretchable film 565 is arranged between the non-skin side sheets 5214 and 5224 and the stretchable nonwoven fabric sheets 5215 and 5225 .

According to this configuration, the visibility of the high pressure region 560 from the non-skin side is high. Thus, the high pressure area 560 can be more easily identified by the user, and the high pressure area 560 can be easily located in the area of the wearer to be restrained. However, the above configuration is not limited, and the stretchable film 565 may be disposed closer to the skin side panels 5213 and 5223 than the non-skin side panels 5214 and 5224.

Moreover, it is preferable that the colored elastic member which forms the high pressure area|region 560 is a sheet-like elastic member similarly to the elastic film 565 of this embodiment. According to this configuration, the area of the different-colored portion having a color different from that of the low-pressure region 550 is larger than that in the case where the elastic member is an elastic thread. For this reason, the high pressure area 560 is noticeable and easily recognized by the user. Additionally, high pressure areas 560 are easily positioned in areas of the wearer to be restrained.

In addition, if the stretchable member forming the high-pressure region 560 is a sheet-like stretchable member, the high-pressure region 560 has firm and close ground-surface contact with the wearer, and local restraint can be prevented. Therefore, the comfort of the diaper 500 can be improved, and the stretchable members are less likely to leave marks on the wearer's skin.

Moreover, it is preferable that the high pressure area|region 560 is formed by the some coloring stretchable member (stretchable film 565) arrange|positioned at intervals in an up-down direction. According to this configuration, a striped pattern is formed in the high-pressure area 560, which is conspicuous as a decorative feature, and the high-pressure area 560 is more easily recognized by the user. In addition, because the high pressure areas 560 are partially colored, the risk of the user feeling the diaper 500 is too constricted can be prevented.

FIG. 22 is an explanatory diagram of the bonding portion 530 formed in the stretchable film 565. FIG. As shown in the aforementioned FIG. 18B , it is desirable that the colored stretchable film 565 is bonded to the sheet (in the present embodiment, the non-skin side sheet) arranged on the non-skin side thereof by a plurality of bonding portions 530 arranged intermittently 5214 and 5224).

According to this configuration, the non-skin side sheets 5214 and 5224 are lifted from the stretchable film 565 between the joint portions 530 , and the non-skin side sheets 5214 and 5224 are formed with pleats (concavities and convexities). To this end, the stretchable film 565 can be identified while also preventing the stretchable film 565 from being too conspicuous. In other words, the stiffness of the stretchable film 565 is reduced by the wrinkling. Therefore, the diaper 500 can be given a soft and comfortable impression to the user.

In addition, as shown in FIG. 22, it is preferable that the interval W2 between the adjoining joints 530 in the up-down direction is smaller than the length (width) W1 (W1>W2) of the stretchable film 565 in the up-down direction (W1>W2), The interval L0 between the joint portions 530 adjacent in the direction is smaller than the length of the stretchable film 565 in the left-right direction (the distance between the paired locking portions 524 in the present embodiment).

According to this configuration, the plurality of coupling parts 530 are arranged in the range of the stretchable film 565 in the up-down direction, and the plurality of coupling parts 530 are arranged in the range of the stretchable film 565 in the left-right direction. To this end, fine pleats are formed by the non-skin side panels 5214 and 5224. Therefore, the diaper 500 can be given a soft and comfortable impression to the user.

However, the above configuration is not limited, and the entire area of the stretchable film 565 may be bonded to the non-skin side panels 5214 and 5224. In this case, the stretchable membrane 565 is prominent, and the visibility of the high pressure area 560 is high.

Note that when comparing the length of the stretchable film 565 and the gap between the adjacent joint portions 530, it is desirable that the front-side belt portion 521 and the rear-side belt portion 522 are elongated in a manner that eliminates wrinkles. Specifically, this is the manner in which the front-side belt portion 521 and the rear-side belt portion 522 match or approximate the dimensions of their constituent members (eg, the non-skin-side sheets 5214 and 5224, etc.) with the dimensions of the constituent members in an independent state stretched state. This similarly applies to other length and position comparisons described later.

In addition, when the color of a part of the high pressure area 560 is different from the color of the low pressure area 550 , the high pressure area 560 includes a different color part 566 (the part including the stretchable film 565 ) having a different color from the color of the low pressure area 550 . ) and a non-heterochromatic portion 567 as an area other than the different-color portion 566 . In this case, at least in the front side belt portion 521 or the rear side belt portion 522, the ratio of the discolored portion 566 per unit area in the center portion in the left-right direction is preferably as high as that in the end portion.

For example, as shown in FIG. 19 , in the left-right central portion of the front side belt portion 521, a part of the first high pressure region 561 and a part of the second high pressure region 562 overlap each other, and in the left-right direction end portion, the first The high pressure region 561 and the second high pressure region 562 are separated from each other. Therefore, in the center portion in the left-right direction, the ratio of the different-color portion 566 per unit area is high. This similarly applies to the rear side strap portion 522 .

For the user, the left-right central portion of the front-side belt portion 521 and the rear-side belt portion 522 is more noticeable than the end portions, and since the ratio of the different color portions 566 per unit area in the central portion is increased, the high-pressure area 560 Easier to be identified by users. However, the configuration is not limited, and for example, the ratio of the different-colored portions 566 per unit area may be constant, or may be higher in the left and right end portions than in the central portion.

In addition, as shown in FIGS. 19 and 20 , it is desirable that the length L51 in the vertical direction from the waist opening 500a to the upper end 560a of the portion of the high pressure region 560 located in the center of the front side belt portion 521 in the left-right direction is different from the length L51 from the waist From the opening 500a to the vertical length L52 of the upper end 560a of the portion of the high-pressure region 560 located in the center portion of the rear belt portion 522 in the left-right direction.

According to this configuration, the user can discriminate the front and rear of the diaper 500 based on the position of the recognizable high pressure region 560 in the up-down direction. Therefore, the diaper 500 is easily put on correctly with respect to the front-rear direction.

Note that the different-colored portions 566 per unit area are satisfied at least in the center between the paired locking portions 524 (both ends in the left-right direction of the belt portion) and the center between the paired locking portions 524 (the center portion in the left-right direction of the belt portion) and the length (L51, L52) from the high pressure area 560 to the waist opening 500a is sufficient. It is preferable that these conditions are satisfied in both end portions extending from the paired locking portions 524 by 1/3 of the length of the distance between the paired locking portions 524 and in the central portion therebetween.

In addition, it is desirable that the shrinkage magnification of the high pressure area 560 is higher than the shrinkage magnification of the low pressure area 550 . The shrinkage magnification is a value calculated by the expression "(a-b)/a×100(%)", where a is the high pressure region 560 and the low pressure in a state of being elongated in the left-right direction in a wrinkle-eliminated state The horizontal length of the region 550, b is the horizontal length of the high pressure region 560 and the low pressure region 550 in a natural state. Therefore, if the high pressure areas 560 are colored, the high pressure areas 560 will be relatively dark in color when the diaper 500 is in its natural state. For this reason, the high pressure area 560 is easily recognized by the user.

In addition, it is desirable to set the light transmittance of sheets other than the colored sheet (here, the stretchable film 565 ) in the high-pressure region 560 to be high (eg, 50% or higher). In addition, it is desirable that the amount of white pigment (eg, titanium oxide, etc.) contained in the flakes other than the colored flakes is set low (for example, less than 10%). Therefore, the colored sheet is more easily observed through other sheets from the non-skin side and the skin side of the front side belt portion 521 and the back side belt portion 522, and the high pressure area 560 is more easily recognized by the user.

Next, the shapes of the first to fourth high pressure regions 561 to 564 will be described in detail.

As shown in FIG. 19 , the first high-pressure region 561 of the front-side belt portion 521 continuously extends in the left-right direction between the paired locking portions 524 , and the left-right central portion of the first high-pressure region 561 is located at both ends thereof. below the section. More specifically, the first high-pressure region 561 is gradually inclined downward from both end portions in the left-right direction toward the center portion.

For this reason, the wearer's abdominal region can be prevented from being over-constrained by the first high pressure region 561 . In addition, the low pressure region 550 may suitably be in close contact with the wearer's abdominal region, thereby improving the comfort of the diaper 500. In addition, the left and right end portions of the first high pressure region 561 can restrain the region near the anterior superior iliac spine of the wearer, and can inhibit the displacement of the diaper 500 during use.

The second high-pressure region 562 of the front belt portion 521 also continuously extends in the left-right direction between the paired locking portions 524, and both ends of the second high-pressure region 562 in the left-right direction are located at a position higher than that of the first high-pressure region. The region 561 is low, and at least a part of the center portion in the left-right direction of the second high pressure region 562 overlaps with the first high pressure region 561 .

In other words, similar to the first high pressure region 561 , the left-right central portion of the second high pressure region 562 is located at a relatively low position. To this end, the wearer's abdominal region can be prevented from being overly constrained by the second high pressure region 562 . In addition, the left and right end portions of the second high pressure region 562 can restrain the region near the anterior superior iliac spine of the wearer, thereby supporting the region from below, and inhibiting displacement of the diaper 500 during use.

In addition, as shown in FIG. 20 , the third high-pressure region 563 of the rear belt portion 522 continuously extends in the left-right direction between the paired locking portions 524, and the center portion of the third high-pressure region 563 in the left-right direction is located is located higher than its left and right ends. More specifically, the third high pressure region 563 is gradually inclined upward from both end portions in the left-right direction toward the center portion.

For this reason, it is possible to prevent the central portion of the buttocks region, where the wearer's movement range is large, from being excessively restrained by the third high-pressure region 563 . In addition, the low-pressure region 550 can be properly in close contact with the center portion of the wearer's buttocks region, whereby the comfort of the diaper 500 can be improved. In addition, if the high pressure area 560 is located in the center of the buttocks area, there is a risk that the high pressure area 560 will be displaced by the bulge and movement of the center of the buttocks area, thereby causing displacement of the diaper 500 . In contrast, the third high-pressure region 563 is arranged so as to partially surround the central portion of the buttocks region from the upper side, thereby suppressing displacement. In addition, similar to the second high pressure area 562, the left and right end portions of the third high pressure area 563 can restrain the area near the anterior superior iliac spine of the wearer, thereby supporting the area from below, and can restrain the diaper 500 from being in Shift during use.

In addition, the fourth high-pressure region 564 of the rear belt portion 522 also continuously extends in the left-right direction between the paired locking portions 524 , and both ends of the fourth high-pressure region 564 in the left-right direction are located at a position higher than that of the fourth high-pressure region 564 . There are three high-pressure regions 563 , and at least a part of the center portion in the left-right direction of the fourth high-pressure region 564 overlaps with the third high-pressure region 563 .

In other words, similarly to the third high pressure region 563 , the left-right central portion of the fourth high pressure region 564 is located at a relatively high position. For this reason, it is possible to prevent the central portion of the wearer's buttocks region from being excessively restrained by the fourth high pressure region 564 . In addition, since the left and right ends of the fourth high pressure area 564 are located at relatively high positions, similar to the first high pressure area 561, the area near the anterior superior iliac spine of the wearer can be restrained, and the diaper 500 can be restrained from Shift during use.

Note that the first high pressure region 561 is satisfied at least in the center between the paired locking portions 524 (both end portions in the left-right direction of the high-pressure region) and the center between the paired locking portions 524 (the center portion in the left-right direction of the high-pressure region). The positional relationship to the fourth high pressure region 564 is sufficient. It is preferable that these conditions are satisfied in both end portions extending from the paired locking portions 524 by 1/3 of the length of the distance between the paired locking portions 524 and in the central portion therebetween.

In addition, it is desirable that the positions of the first high pressure region 561 and the fourth high pressure region 564 in the up-down direction are partially or completely aligned with each other in the locking portion 524 . Similarly, it is desirable that the positions of the second high pressure region 562 and the third high pressure region 563 in the up-down direction are partially or completely aligned with each other in the locking portion 524 . According to this configuration, an annular high-pressure region 560 is formed. Therefore, the diaper 500 is fitted around the waist of the wearer, and displacement of the diaper 500 can be suppressed.

In addition, the lower end of the fourth high pressure area 564 is arranged higher than the lower end of the first high pressure area 561 and the lower end of the third high pressure area 563 is arranged at the center in the left-right direction of the front side belt portion 521 and the rear side belt portion 522 is configured to be higher than the lower end of the second high pressure region 562 . Therefore, the abdominal region can be depressed obliquely upward, and the intra-abdominal pressure can be raised. Thus, this can assist in the movement of muscles in the pelvic region (eg, abdominal muscles) and can stabilize the wearer's pelvis.

In addition, in the rear belt portion 522, the vertical length from the upper end of the fourth high pressure region 564 to the lower end of the third high pressure region 563 is longer in the left and right end portions than in the left and right center portion. The position of the lower end of the third high pressure region 563 is lower in the both ends in the left and right direction than in the center portion in the left and right direction. Further, the lower end of the third high pressure region 563 is gradually inclined downward from the center portion in the left-right direction of the rear side belt portion 522 toward both end portions. In other words, the third high pressure area 563 and the fourth high pressure area 564 are configured to conform to the shape of the gluteus medius. To this end, the third high pressure area 563 and the fourth high pressure area 564 may restrain the gluteus medius of the wearer and may assist the movement of the gluteus medius when the diaper 500 is worn. As a result, the wearer's pelvis is stabilized during movement such as walking, and the wearer's movement (walking) can be supported.

In addition, in the diaper 500 of the present embodiment, the high-pressure area 560 that fits to the body shape of the wearer as described above is visible because it is different in color from the low-pressure area 550 . To this end, the user can wear the diaper 500 in a position of the wearer that allows movement, is comfortable, and is not easily displaced. Therefore, the effect of the high pressure region 560 is obtained more surely.

Note that the high-pressure regions 560 shown in FIGS. 19 and 20 are merely examples, and the number, shape, configuration, and the like of the high-pressure regions 560 are not particularly limited. For example, the diaper 500 may have any of one or more of the first high pressure areas 561 to the fourth high pressure areas 564 . In addition, a configuration is possible in which one of the front-side belt portion 521 or the rear-side belt portion 522 has the high-pressure area 560 and the other does not have the high-pressure area 560 .

Although the embodiments of the present disclosure have been described above, the above embodiments of the present disclosure are only for facilitating the understanding of the present disclosure and are not to be construed as limiting the present disclosure in any way. Various changes or modifications may be made in the present disclosure without departing from the gist thereof, and equivalents thereof are covered.

Description of reference numerals

1 shorts type disposable diaper,

10 absorbent body, 11 absorbent core,

12 front sheet, 13 back sheet, 14 three-dimensional pleats,

20 outer body,

21 ventral outer body (front belt part), 21s base area,

22 Back side exterior body (rear side belt part),

213, 223 Skin side sheet (skin side non-woven sheet),

214, 224 Non-skin side sheet (non-skin side non-woven sheet),

215, 225 Stretchable nonwoven sheet (stretchable member),

23 Crotch outer body, 24 End joint area,

26 waist elastic, 26s stretch area,

27 Leg elastic members,

30 stretch membrane, 30s high pressure zone,

31s first high pressure area, 32s second high pressure area,

33s low pressure zone, 34 vents,

40 welds, 50 holes (vent),

300 diapers (shorts-type disposable diapers),

310 absorbent body, 311 absorbent core,

312 front sheet, 313 back sheet,

320 exterior body, 321 front belt, 322 rear belt,

3213, 3223 Skin Side Panels, 3214, 3224 Non-Skin Side Panels,

3215, 3225 Stretchable nonwoven sheet (front stretchable member),

323 Crotch, 324 Lock,

326 waist elastic, 327 leg elastic,

330 low pressure area, 331 rear low pressure area (low pressure area),

332 Front low pressure area,

340 high pressure area, 341 rear high pressure area (high pressure area),

342 Front high pressure area,

343 stretchable film (rear stretchable member, front stretchable member),

350 junction, 360 gluteus medius, 361 gluteus maximus,

500 diapers (shorts-type disposable diapers),

500a waist opening, 500b leg opening,

510 Absorbent body, 511 Absorbent core,

512 front sheet, 513 back sheet,

520 outer body,

521 Front side belt part (belt part), 522 Rear side belt part (belt part),

5213, 5223 Skin Side Panels, 5214, 5224 Non-Skin Side Panels,

5215, 5225 stretchable non-woven sheet,

523 Crotch, 524 Lock, 527 Leg Elastic,

530 junction,

540 Waist stretch zone (stretch zone), 541 Elastic thread,

550 low pressure area,

560 high pressure area,

561 first high pressure area, 562 second high pressure area,

563 third highest pressure area, 564 fourth highest pressure area,

565 Stretch film (stretch member),

566 heterochromatic part, 567 non heterochromatic part.

Claims (9)

1. A pants-type disposable diaper having a vertical direction, a horizontal direction and a front-rear direction intersecting each other,

the pants-type disposable diaper includes:

a front side band portion;

a rear side belt portion; and

an absorbent body comprising an absorbent core,

the front side belt part and the back side belt part form a waist opening at an upper end of the pants-type disposable diaper,

the front belt part and the rear belt part each include a skin-side nonwoven fabric sheet, a non-skin-side nonwoven fabric sheet, and a stretchable member,

the skin-side nonwoven fabric sheet is located at the position closest to the skin side,

the non-skin side nonwoven fabric sheet is located at the position closest to the non-skin side,

the stretchable member is stretchable in the left-right direction,

the front side band portion and the rear side band portion each having a stretch region, a base region and a high pressure region,

the stretch region is a region extending along an edge of the waist opening,

the base region is a region adjacent to a lower side of the stretchable region at a center of the front side belt portion in a left-right direction,

the high pressure region is disposed below the telescopic region,

a magnitude of a force required to elongate the unit width portion of the high pressure region by a unit length in the left-right direction is larger than a magnitude of a force required to elongate the unit width portion of the base region by a unit length in the left-right direction,

the high pressure region extending circumferentially around the front and back band portions,

the high pressure region includes an elastic film between the skin-side nonwoven fabric sheet and the non-skin-side nonwoven fabric sheet,

the high pressure region includes a vent portion in which air permeability is higher than in a portion where the stretchable membrane is located,

in at least one of the front side belt portion and the rear side belt portion, the high pressure region does not overlap with the absorbent core in the front-rear direction,

the stretchable member is a sheet-like member having air permeability,

the stretchable member is a stretchable nonwoven fabric sheet,

the stretchable nonwoven fabric sheet is disposed at a position between the skin-side nonwoven fabric sheet and the non-skin-side nonwoven fabric sheet, and

the stretchable nonwoven fabric sheet is positioned on the skin side with respect to the stretchable film.

2. A pants-type disposable diaper according to claim 1,

the stretchable member is a stretchable nonwoven fabric sheet,

in the stretchable region, a plurality of thread-like elastic members are arranged side by side at intervals in the vertical direction, and the plurality of thread-like elastic members are stretchable and stretchable in the horizontal direction

A length in the up-down direction from an upper end of the high pressure region to an upper end of the front side belt portion is greater than a length in the up-down direction of the high pressure region at a center in the left-right direction of the front side belt portion.

3. A pants-type disposable diaper according to claim 1,

in the high pressure region, the plurality of stretchable films that are long in the left-right direction are arranged side by side at intervals in the up-down direction, and

a portion between the stretchable membranes adjacent in the up-down direction serves as the vent portion.

4. A pants-type disposable diaper according to claim 3,

in the high-pressure region, an area of a portion where the stretchable membrane is located is larger than an area of the vent portion between the stretchable membranes adjacent in the up-down direction.

5. A pants-type disposable diaper according to claim 3 or 4,

a value obtained by dividing the area of the ventilation portion by the area of the high pressure region is larger in side portions of the front side belt portion and the rear side belt portion in the left-right direction than in a central portion of the front side belt portion and the rear side belt portion in the left-right direction.

6. A pants-type disposable diaper according to claim 3 or 4,

each of the stretchable films has no hole penetrating the stretchable film.

7. A pants-type disposable diaper according to claim 1 or 2,

the stretchable membrane has a hole penetrating through the stretchable membrane, and

the hole forms the vent.

8. A pants-type disposable diaper according to any one of claims 1 to 3,

the skin-side nonwoven fabric sheet, the non-skin-side nonwoven fabric sheet, the stretchable member, and the stretchable film are welded together in the front-back direction using the same welding pattern.

9. A pants-type disposable diaper according to claim 8,

the welding pattern is a pattern in which a plurality of welding parts are scattered, and

in an extended state of the pants-type disposable diaper, an area of the vent portion is larger than an area of the welded portion located in the high pressure region.

Images