JP2012210234A - Underpants type disposable diaper - Google Patents

Abstract

An object of the present invention is to provide a pants-type diaper having excellent dynamic fit on the ventral side.
A tensile force at the time of elastic deformation in the width direction of the front waist edge region fw is F _fw , a tensile force at the time of elastic deformation in the width direction of the iliac contact region fi is F _fi , and the width of the lower abdomen contact region fd when the tensile force when the direction of the elastic deformation that F _fd, and elastic deformation when tensile force in the width direction of the lower rear end side region bd and _{F bd, F fd> F fw} > of F _fi relationship and F _fd of> F _bd Configure to satisfy the relationship.
[Selection] Figure 6

Description

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

  The pants-type disposable diaper includes an exterior sheet having a front body and a back body, and an interior body including an absorbent body fixed to the inner surface of the exterior sheet, and the front body and the back body of the exterior sheet are on both sides. A side seal portion is formed by bonding, and a waist opening and a pair of left and right leg openings are formed. Hereinafter, the fixing portion between the exterior sheet and the interior body is also referred to as an inner / outer fixing portion. Moreover, in order to prevent what is called a side leak, the solid gathers which protrude from the inner surface of a diaper are each extended along the front-back direction in the width direction both sides of an interior body.

  In the pants-type disposable diaper, in order to improve the fit to the body, various elastic elastic members are fixed to the exterior sheet in an extended state, and in particular, the longitudinal region having a side seal portion In general, those having an elastic expansion and contraction member (Patent Document 1, etc.) are generally used.

  In addition, while the tightening pressure in the waist edge region is generally relatively high, by increasing the tightening pressure in the diaper region corresponding to the wearer's iliac region, It has also been proposed to make a good fit with respect to the stomach that has been put out to prevent slippage (see Patent Document 1).

JP 2010-279813 A

However, in conventional pants-type disposable diapers, due to movement after wearing and dimensional incompatibility, etc., the three-dimensional gather that should be positioned on the outside in the width direction from the wearer's burst is shifted, falling into the burst, In some cases, the leakage prevention performance of the three-dimensional gather in the back body was lowered.
Therefore, a main problem of the present invention is to prevent a three-dimensional gather shift in the back body.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
The side seal part is formed by joining the both sides of the exterior sheet forming the front body extending from the crotch part to the ventral side and the both sides of the exterior sheet forming the back body extending from the crotch part to the back side. A waist opening for passing the wearer's torso and a pair of left and right leg openings for passing the legs,
The inner body including the absorber is fixed to the central portion in the width direction inside the outer sheet,
In the pants-type disposable diaper in which the three-dimensional gathers protruding from the inner surface of the diaper are respectively extended along the front-rear direction on both sides in the width direction of the interior body,
Of the exterior sheet forming the front body and the exterior sheet forming the back body, at least the longitudinal regions having the side seal portions are configured to elastically expand and contract in the width direction, respectively.
The longitudinal region having the side seal portion of the exterior sheet forming the front body is located on the crotch side from the front waist edge region that forms the edge of the waist opening and the front waist edge region, and is mounted An iliac abutment region that abuts the person's iliac region, and a lower abdomen abutment region that abuts the wearer's lower abdomen,
The longitudinal region having the side seal portion of the exterior sheet forming the back body is a rear waist edge region corresponding to the front waist edge region, a rear intermediate region corresponding to the iliac contact region, A rear lower end side region corresponding to the lower abdomen contact region,
F _{fw is} the tensile force during elastic deformation in the width direction of the front waist edge region, F _{fi is} the tensile force during elastic deformation in the width direction of the iliac contact region, and elastic deformation in the width direction of the lower abdomen contact region. Assuming that the tensile force at the time is F _fd and the tensile force at the time of elastic deformation in the width direction of the rear lower end side is F _bd , the relationship of F _fd > F _fw > F _{fi and} the relationship of F _fd > F _bd are satisfied. Configured
A pants-type disposable diaper characterized by that.

(Function and effect)
In the present invention, the tensile force F _fd in the elastic deformation in the width direction of the lower abdomen contact region is made larger than the tensile force F _{bd in} the elastic deformation in the width direction of the rear lower end side region corresponding to this and the waistline direction. Therefore, the rear lower end side region that is a region that contacts the bulge of the buttocks is strongly pulled forward by the lower abdomen contact region of the front body and is expanded in the left-right direction, and movement to the rupture side is suppressed. It is difficult to cause a situation in which a three-dimensional gather in the back body, which should originally be positioned on the outer side in the width direction than the wearer's explosion, is shifted to the explosion side and falls.
In addition, if the tensile force at the time of elastic deformation in the front and rear is simply changed considering only the back body, the fit of the front body may be lowered, and as a result, the back body may be easily displaced. The tensile force F _fd during elastic deformation in the width direction of the abutment region is made strongest, and then the tensile force F _fw during elastic deformation in the width direction of the front waist edge region is strengthened, and the elasticity in the width direction of the iliac abutment region By making the tensile force when deforming F _fi the weakest (in contrast to the cited reference 1 in this respect), the fit of the front body is remarkably improved, and as a result, the rear body is more difficult to shift. It is supposed to be. That is, the lower abdomen is the region where the lower abdomen abutment region is most difficult to shift because the stomach is not significantly expanded and contracted or deformed due to the movement of the body before and after a meal or body movement compared to the upper iliac region or the like. Therefore, the diaper can be firmly supported on the body by making the tightening force of the lower abdomen contact region the strongest. Further, by making the tightening force of the iliac abutment region the weakest, it is possible to flexibly follow the expansion and contraction and deformation of the stomach. Furthermore, if the tightening force of the iliac abutment region is simply weakened, the slippage tends to fall off.In the present invention, the tightening force of the front waist edge region is stronger than that of the iliac abutment region, and the tightening force of the lower abdomen abutment region Therefore, the regions on both sides in the longitudinal direction of the iliac abutment region are supported, and the iliac abutment region can be prevented from being displaced. Therefore, both the static fit and the dynamic fit in the front body are improved, and the effect of preventing slippage is excellent, and as a result, the rear body is more difficult to slip.
The iliac region refers to the region from the iliac crest to the upper anterior iliac spine, and the lower abdomen is the combined portion of the pubic region and the buttocks. It means the place that touches the thigh. Further, the tensile force at the time of elastic deformation means a tensile force at an elongation of 150% when the natural length in the width direction is 100%.

<Invention of Claim 2>
Of the inner and outer fixing parts for fixing the exterior sheet and the interior body, both side edges of the portion located in the rear lower end side region are located in the same or in the vicinity of both side edges of the interior body,
Of the inner and outer fixed parts, the width of the part located in the lower abdomen contact area is narrower than the width of the part located in the rear lower end side area,
The width of the elastic expansion / contraction range in the lower abdomen contact region is wider than the width of the elastic expansion / contraction range in the rear lower end side region,
The pants-type disposable diaper according to claim 1.

(Function and effect)
In order to prevent misalignment of the three-dimensional gathers in the back body, it is preferable that the both side edges of the inner and outer fixing parts in the back body are the same as or close to the both side edges of the interior body. However, the amount of expansion and contraction in the width direction is inevitably reduced, and it becomes difficult to ensure a good fit for large unevenness on the surface of the body like the buttocks. As long as the amount of expansion and contraction is sufficient, it can be ensured even if the elastic expansion and contraction range is narrow, but the tightening pressure becomes tight.
On the other hand, as described above, when the width of the inner / outer fixing portion of the front body is narrowed at least in the lower abdomen contact region and the width of the elastic expansion / contraction range is widened only by that portion, the elastic expansion / contraction range narrowing in the rear body is reduced. In the vertical region corresponding to the swelling of the buttock, appropriate and sufficient stretchability can be ensured in the entire circumferential direction of the diaper, and the fitting property to the buttock is excellent.

<Invention of Claim 3>
The rear intermediate region rear end corresponding to the rear end of the interior body in the rear intermediate region is more elastically deformed in the width direction than the portion corresponding to the rear intermediate region rear end in the iliac contact region. The pants-type disposable diaper according to claim 1 or 2, wherein the tensile force is weak.

(Function and effect)
Thereby, since the rear end portion of the interior body is strongly pulled forward by the iliac abutment region of the front body and deployed in the left-right direction, the movement of the three-dimensional gathers on both sides of the interior body to the explosion side is It will be further suppressed.

<Invention of Claim 4>
The crotch part elastic elastic member which bulges outside while shrinking the crotch part of the interior body in the width direction is provided at least in the interior body or the exterior sheet in the crotch part. The listed pants-type disposable diapers.

(Function and effect)
On the other hand, in the present invention, the lower abdomen abutment region is tightened most strongly, so the urine receiving space in the lower abdomen is reduced, and if there is a large amount of urination, there is a risk of leakage. It is also a preferable form that an elastic stretchable member is provided to enlarge the space between the interior body and the wearer's crotch by contracting the crotch portion of the interior body in the width direction and bulging outward.

<Invention of Claim 5>
The exterior sheet that forms the front body is an integral sheet base material extending at least over the front waist edge region, the iliac contact region, and the lower abdomen contact region, and the front waist edge region of the sheet base material in the longitudinal direction. A number of elongated front waist edge elastic elastic members along the width direction, which are fixed in an extended state in the width direction at intervals, and a width direction in the longitudinal direction at the iliac contact region in the sheet base material Numerous elongated iliac elastic members extending in the width direction fixed in the stretched state, and many fixed in the widthwise stretched state in the lower abdomen abutment region of the sheet base material in the longitudinal direction. An elongated lower abdomen elastic elastic member along the width direction of
The exterior sheet forming the back body has a longitudinally spaced space between an integral sheet base material extending at least a rear waist edge region, a rear intermediate region and a rear lower end side region, and a rear waist edge region of the sheet base material. A plurality of elongated rear waist edge elastic elastic members along the width direction fixed in the width direction extended state, and fixed in the width direction extended state with a space in the rear intermediate region of the sheet base material in the vertical direction. A plurality of elongated rear intermediate elastic members extending along the width direction, and a plurality of elongated shapes along the width direction fixed in the width direction extending in the longitudinal direction at the rear lower end side region of the sheet base material And a rear lower end side elastic elastic member,
Vertical spacing between the front waist edge elastic elastic member, the iliac elastic elastic member and the lower abdominal elastic elastic member, and between the lower abdominal elastic elastic member and the rear lower elastic member By changing at least one of the thickness, the expansion rate at the time of fixation, and the number, the relationship of F _fd > F _fw > F _{fi and} the relationship of F _fd > F _bd are satisfied.
The underpants type disposable diaper of any one of Claims 1-4.

(Function and effect)
Thus, it is preferable to provide an elongated elastic stretchable member in each region because an appropriate tightening force can be easily applied to each region and the manufacturing becomes extremely easy.

  As described above, according to the present invention, there are advantages such as excellent dynamic fit on the ventral side.

It is a top view in the state where the diaper was developed showing the inside of a pants type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a pants type disposable diaper. FIG. 3 is a 3-3 cross-sectional view of FIG. 1. FIG. 4 is a sectional view taken along the line 4-4 in FIG. 1. FIG. 5 is a sectional view taken along line 5-5 in FIG. 1. It is a perspective view which shows roughly only the principal part of a pants type disposable diaper. It is sectional drawing which shows only the principal part of a pants type disposable diaper. It is a perspective view of a pants type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a pants type disposable diaper.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the term “elongation rate” means a value when the natural length is 100%.
1-8 has shown an example of the underpants type disposable diaper. This pants-type disposable diaper is composed of an exterior sheet 12 that forms the outer surface (back surface) of the product, and an interior body 200 that is attached to the inner surface of the exterior sheet 12. The inner / outer fixing portion for fixing is denoted by reference numeral 300 in FIG. Symbol Y indicates the total length of the diaper in the deployed state (the length in the front-rear direction from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the back body B), and symbol X indicates the diaper in the deployed state. The full width of is shown.

  The interior body 200 is a part that absorbs and holds excrement such as urine, and the exterior sheet 12 is a part that is worn by the wearer. In addition, the dot pattern part in sectional drawing has shown the joining part which joins each structural member, and these joining parts include the inside and outside fixing | fixed part 300, solids, such as a hot-melt-adhesive, a bead, a curtain, a summit, spiral application, etc. It is formed by. Also, “front-rear direction (vertical direction)” means a direction connecting the ventral side (front side) and back side (rear side), and “width direction” means a direction (left-right direction) orthogonal to the front-rear direction. The “vertical direction” means the state in which the diaper 100 is worn, that is, the direction perpendicular to the waistline direction when the diaper 100 is folded in two at the crotch so that both sides of the front body and the back of the diaper 100 overlap each other. In other words, it means the direction connecting the waist opening WO side and the crotch side.

(Interior body)
The interior body 200 can take any shape, but is rectangular in the illustrated form. As shown in FIGS. 3 to 5, the interior body 200 includes a surface sheet 30 on the body side, a liquid-impermeable back sheet 11, and an absorbent element 50 interposed therebetween. It is the main body that takes up the absorption function. Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent element 50. Shows a three-dimensional gather 60 that stands on the body side and is provided on both sides of the interior body 200 in order to prevent excrement from leaking to both sides of the interior body 200.

(Surface sheet)
The top sheet 30 has a property of transmitting liquid, and examples thereof include a porous or non-porous nonwoven fabric, a porous plastic sheet, and the like. Further, these nonwoven fabric, whether the raw material fibers is what is not particularly limited. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. For example, if flexibility and drapeability are required, the spunbond method and spunlace method are preferable. If bulkiness and softness are required, the air-through method, point bond method, and thermal bond method are preferable processing methods. .
Further, the top sheet 30 may be composed of one sheet or may be composed of a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.
When providing the three-dimensional gather 60, both sides of the surface sheet 30 pass between the liquid-impermeable back sheet 11 and the three-dimensional gather 60 to the back side of the absorbent element 50 to prevent penetration of the liquid. It is preferable to adhere to the liquid-impermeable back sheet 11 and the three-dimensional gather 60 with a hot melt adhesive or the like.

(Intermediate sheet)
An intermediate sheet (also referred to as “second sheet”) 40 having a higher liquid permeation rate than the top sheet 30 can be provided to quickly transfer the liquid that has passed through the top sheet 30 to the absorber. This intermediate sheet 40 not only improves the absorption performance of the absorbent by quickly transferring the liquid to the absorbent body, but also prevents the “reversed” phenomenon of the absorbed liquid from the absorbent body, so that the top sheet 30 is always dried. It can be made into the state which carried out. The intermediate sheet 40 can be omitted.
Examples of the intermediate sheet 40 include the same material as the top sheet 30, spunlace, spunbond, SMS, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond, or crepe paper. In particular, an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. Basis weight is preferably ^{20~80g / m 2, 25~60g / m} 2 is more preferable. The thickness of the raw fiber of the nonwoven fabric is preferably 2.2 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use an eccentric fiber, a hollow fiber, or an eccentric and hollow fiber that does not have a core at the center as the mixed fiber of all or part of the raw fiber.
The intermediate sheet 40 in the illustrated form is disposed in the center shorter than the width of the absorber 56, but may be provided over the entire width. The length of the intermediate sheet 40 in the longitudinal direction may be the same as the length of the absorbent body 56 or may be within a short length range centered on the region that receives the liquid.

(Impermeable liquid back sheet)
The material of the liquid-impermeable back sheet 11 is not particularly limited. For example, a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric in which a plastic film is provided on the surface of the nonwoven fabric, or plastic Examples thereof include a laminated sheet in which a nonwoven fabric or the like is laminated on a film and joined. For the liquid-impermeable back sheet 11, it is preferable to use a liquid-impervious and moisture-permeable material that has been preferred in recent years from the viewpoint of preventing stuffiness. As a plastic film having moisture permeability, a microporous plastic film obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching in a uniaxial or biaxial direction. Is widely used. In addition, non-woven fabric using micro-denier fibers, leakproof reinforcement by reducing the voids of the fibers by applying heat or pressure, and methods such as applying a superabsorbent resin or hydrophobic resin or water repellent Accordingly, a sheet that is liquid-impermeable without using a plastic film can also be used as the liquid-impermeable back sheet 11.
The liquid-impermeable back sheet 11 is preferably extended to both sides of the side surface 30 of the absorbent element 50 by wrapping around both sides of the absorbent element 50 in order to improve leakage resistance. The width of this extended portion is suitably about 5 to 20 mm on each of the left and right sides.
Moreover, the excretion indicator from which a color changes by absorption of a liquid part can be provided in the inner side of the liquid-impermeable back sheet 11, especially the absorber 56 side surface.

(Three-dimensional gather)
The three-dimensional gather 60 is a belt-like member that extends over the entire front-rear direction along both side portions of the interior body 200, blocks urine and soft stool that move in the lateral direction along the top sheet 30, and prevents side leakage. It is provided for this purpose. The three-dimensional gather 60 of the present embodiment is provided so as to stand up from the side portion of the interior body 200, the base side portion rises obliquely toward the center in the width direction, and the tip side portion from the intermediate portion has a width. It stands up diagonally outward in the direction.
More specifically, the three-dimensional gather 60 folds the belt-shaped gather sheet 62 having a length equal to the length in the front-rear direction of the interior body 200 in the width direction and folds it into two. In addition, a plurality of elongated elastic elastic members 63 are fixed along the longitudinal direction at intervals in the width direction. An end portion of the three-dimensional gather 60 opposite to the folded portion in the width direction is an attachment portion 65 fixed to the back surface of the side edge portion of the interior body 200, and portions other than the attachment portion 65 protrude from the attachment portion 65. It is set as the protrusion part 66 (part by the side of a folding | turning part). Further, both end portions in the front-rear direction of the protruding portion 66 extend from the mounting portion 65 to the side surface of the topsheet 30 through the side portion of the interior body 200 and are hot-melted to the side surface of the topsheet 30. The base side portion is fixed to the front and rear fixing portion 67 by an adhesive or heat seal, and the tip side portion is folded back outward in the width direction from the tip of the base side portion and fixed to the base side portion. An intermediate part in the front-rear direction of the protruding part is an unfixed free part (inner free part), and an elongated elastic member 63 extending in the front-rear direction is fixed to the free part in an extended state.
The gather sheet 62 is made of a spunbond nonwoven fabric (SS, SSS, etc.), SMS nonwoven fabric (SMS, SSMMS, etc.), a melt-blown nonwoven fabric with excellent uniformity and concealment, and water repellent with silicon as necessary. A treated product can be suitably used, and the fiber basis weight is preferably about 10 to 30 g / m ² . As the elongated elastic elastic member 63, rubber thread or the like can be used. When spandex thread rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. Elongation at fixed, preferably 150 to 350%, and more preferably 200 to 300%. Further, as shown in the drawing, a waterproof film 64 can be interposed between the gather sheets folded in two.
2-6 are preferable and, as for the number of the elongate elastic expansion-contraction members 63 provided in the free part of the three-dimensional gather 60, 3-5 are more preferable. The arrangement interval 60d is suitably 3 to 10 mm. If comprised in this way, in the range which has arrange | positioned the elongate elastic expansion-contraction member 63, it will become easy to contact | abut with respect to skin. The elongated elastic elastic member 63 may be disposed not only at the distal end side but also at the base side.
The fixing target of the attachment portion 65 of the three-dimensional gather 60 can be an appropriate member such as the top sheet 30, the liquid-impermeable back sheet 11, and the absorbent element 50 in the interior body 200.
In the three-dimensional gather 60 thus configured, the contraction force of the elongated elastic elastic member 63 acts so that both ends in the front-rear direction are brought close to each other. On the other hand, since they are non-fixed free portions, only the free portions stand up against the body side as shown in FIG. In particular, when the attachment portion 65 is positioned on the back surface side of the interior body 200, the three-dimensional gather 60 stands up so as to open outward in the width direction at the crotch portion and in the vicinity thereof. It comes in contact, and the fit is improved.
The dimensions of the three-dimensional gather 60 can be determined as appropriate. In the case of an infant paper diaper, for example, as shown in FIG. 7, the standing height of the three-dimensional gather 60 (the length in the width direction of the protruding portion 66 in the unfolded state) W6 is It is preferably 15 to 60 mm, particularly 20 to 40 mm. In addition, the distance W3 between the folds located on the innermost side in a state where the three-dimensional gather 60 is folded flat so as to be parallel to the surface of the top sheet 30 is preferably 60 to 190 mm, particularly preferably 70 to 140 mm.
Note that, unlike the illustrated embodiment, the three-dimensional gathers can be provided in double (two rows) on the left and right sides of the interior body 200.

(Absorption element)
The absorbent element 50 includes an absorbent body 56 and a packaging sheet 58 that wraps the entire absorbent body 56. The packaging sheet 58 can be omitted.

(Absorber)
The absorber 56 can be formed of an aggregate of fibers. As this fiber assembly, a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate as well as short fibers such as cotton-like pulp and synthetic fibers Can also be used. The fiber basis weight can be set to, for example, about 100 to 300 g / m ² when cotton-like pulp or short fibers are stacked, and in the case of a filament aggregate, for example, about 30 to 120 g / m ^2. Can do. The fineness in the case of a synthetic fiber is 1-16 dtex, for example, Preferably it is 1-10 dtex, More preferably, it is 1-5 dtex. In the case of a filament aggregate, the filament may be a non-crimped fiber, but is preferably a crimped fiber. The crimped degree of the crimped fiber can be, for example, 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. Further, a crimped fiber that is uniformly crimped is often used. It is preferable to disperse and hold superabsorbent polymer particles in the absorber 56.
Although the absorbent body 56 may be rectangular, as shown in FIG. 6, as shown in FIG. 6, the hourglass has a front end portion, a rear end portion, and a narrow portion narrower than the front end portion and the rear end portion. When the shape is formed, it is preferable because the fit of the absorber 56 itself and the three-dimensional gather 60 around the legs is improved.
Moreover, although the dimension of an absorber can be determined suitably, it is preferable to extend to the peripheral part of the interior body, or its vicinity in the front-back direction and the width direction. Reference numeral 56X indicates the width of the absorber 56.

(Superabsorbent polymer particles)
The absorber 56 can contain superabsorbent polymer particles in a part or all thereof. Superabsorbent polymer particles include “powder” in addition to “particles”. As the particle diameter of the superabsorbent polymer particles, those used in this type of absorbent article can be used as they are, and those having a particle size of 1000 μm or less, particularly 150 to 400 μm are desirable. The material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable. High-absorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and sodium carboxymethylcellulose crosslinks. Or an acrylic acid (salt) polymer can be used. As the shape of the superabsorbent polymer particles, a commonly used granular material is suitable, but other shapes can also be used.
As the superabsorbent polymer particles, those having a water absorption rate of 40 seconds or less are preferably used. When the water absorption speed exceeds 40 seconds, so-called reversion in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56 is likely to occur.
Further, as the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. Thereby, even if it is a case where it is set as the bulky absorber 56, the sticky feeling after liquid absorption can be suppressed effectively.
The basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² . If the amount of polymer is less than 50 g / m ^2, it is difficult to secure the absorption amount. When it exceeds 350 g / m ² , the effect is saturated.
If necessary, the superabsorbent polymer particles can adjust the spraying density or spraying amount in the plane direction of the absorber 56. For example, it is possible to increase the application amount of the liquid excretion site as compared to other sites. When gender differences are taken into account, men can increase the front spray density (amount), while women can increase the center spray density (amount). In addition, a portion where no polymer exists locally (for example, in a spot shape) in the planar direction of the absorber 56 can also be provided.

(Packaging sheet)
When the packaging sheet 58 is used, as the material, tissue paper, particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet with small holes, or the like can be used. However, it is desirable that the superabsorbent polymer particles be a sheet that does not escape. When a nonwoven fabric is used in place of the crepe paper, a hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and the material can be polypropylene, polyethylene / polypropylene composite material, or the like. The basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .
The packaging form of the packaging sheet 58 can be determined as appropriate, but from the viewpoint of ease of manufacture and prevention of leakage of the superabsorbent polymer particles from the front and rear end edges, the cylinder is formed so as to surround the front and back surfaces and both side surfaces of the absorbent body 56. It is preferable that the front and rear edges of the absorbent body 56 are protruded from the front and back of the absorbent body 56, and the protruding portions are crushed in the front and back directions and joined by a joining means such as a hot melt adhesive.

(Exterior sheet)
The exterior sheet 12 has a part constituting the front body F extending from the crotch part to the ventral side and a part constituting the rear body B extending from the crotch part to the back side, and both sides of the front body F As shown in FIG. 8, the waist opening WO for passing the wearer's torso and the left and right sides for passing the legs are joined. A pair of leg openings LO is formed. The crotch portion means the center in the front-rear direction from the waist edge of the front body F to the waist edge of the back body B in the unfolded state, and the front part and the back part thereof are the front body F and Each back body B is meant.

  The exterior sheet 12 includes a waistline portion T that is defined as a vertical region (a vertical region extending from the waist opening WO to the upper end of the leg opening LO) and a front-rear direction region of a portion that forms the leg opening LO. An intermediate portion L defined as (between the front-rear direction region having the side seal portion 12A of the front body F and the front-rear direction region having the side seal portion 12A of the rear body B).

  The waistline T is located on the front waist edge region fw and the rear waist edge bw (region corresponding to the front waist edge region) that form the edge of the waist opening, and between these crotch sides, The iliac abutment region fi and the posterior intermediate region bi (part corresponding to the iliac abutment region), the lower abdomen abutment region fd that abuts the lower abdomen of the wearer, and the rear lower end side region bd (Part corresponding to the lower abdomen contact area), and each elastically expands and contracts in the width direction.

  The vertical lengths of these regions vary depending on the size of the product and can be determined as appropriate. For example, the vertical lengths of the front waist edge region fw and the rear waist edge bw are 2 to 12 of the total length Y of the diaper. %, The longitudinal length of the iliac abutment region fi and the posterior intermediate region bi is about 2 to 14% of the diaper overall length Y, and the longitudinal length of the lower abdomen abutment region fd and the posterior lower end side region bd is the diaper overall length. It can be about 5 to 19% of Y. In particular, when the longitudinal length of the side seal portion 12A is 20 to 30% of the total length of the diaper, for example, the longitudinal lengths of the front waist edge region fw and the rear waist edge portion bw are about 2 to 10% of the total length Y of the diaper. The longitudinal length of the iliac abutment region fi and the posterior intermediate region bi is about 4 to 12% of the diaper overall length Y, and the longitudinal length of the lower abdomen abutment region fd and the posterior lower end side region bd is the diaper overall length Y. It can be about 8 to 15%. In the case of a general pants-type disposable diaper, a longitudinal range between the edge of the waist opening WO and the edge of the interior body 200 on the waist side of the waistline T of the exterior sheet 12 is defined as the front waist edge region fw and About 30 to 50% of the waist side in the longitudinal direction overlapping the interior body 200 as the rear waist edge bw is defined as the iliac abutment region fi and the posterior intermediate region bi, and the remaining longitudinal range is defined as the lower abdomen abutment region fd. And the rear lower end side region bd.

  On the other hand, the intermediate portion L is bound so that both side edges extend around the legs of the wearer, and this is a portion into which the wearer's legs are put. As a result, the exterior sheet 12 has a substantially hourglass shape as a whole. The degree of tightness of the exterior sheet 12 can be determined as appropriate, and, as shown in FIGS. 1 to 8, the narrowest part may be narrower than the width of the interior body 200 in order to obtain a clean appearance. Although it is preferable, the narrowest part may be determined so as to be equal to or larger than the width of the interior body 200.

Characteristically, in the exterior sheet 12, the tensile force at the elastic deformation in the width direction of the front waist edge region fw is F _fw , the tensile force at the elastic deformation in the width direction of the iliac contact region fi is F _fi , abdominal contact area fd elastic deformation when tensile force in the width direction F _fd, and when the width direction of the elastic deformation when tensile force of the rear lower end area bd was F _bd, relationship F _fd> F _fw> F _fi And F _fd > F _bd is satisfied. Thus, the width direction of the elastic deformation tensile force F _fd lower abdominal abutment region fd, is larger than the tensile at the width direction of the elastic deformation of the lower end region bd force F _bd after corresponding thereto and waistline direction As a result, the rear lower end side region bd that is in contact with the bulge of the buttock is strongly pulled forward by the lower abdomen contact region fd of the front body F and is expanded in the left-right direction, and movement to the rupture side is suppressed. Therefore, it is difficult to cause a situation in which the three-dimensional gathers 60 and 60 in the rear body, which should originally be positioned in the width direction outside of the wearer's rupture, are shifted to the rupture side and fall down.

Further, if the tensile force at the time of elastic deformation in front and rear is simply changed considering only the back body B, the fit of the front body F is lowered, and as a result, the back body B may be easily displaced. Then, the tensile force F _fd during elastic deformation in the width direction of the lower abdomen abutting region fd is _maximized , and then the tensile force F _fw during elastic deformation in the width direction of the front waist edge region _fw is strengthened. F _{fi has} the weakest tensile force during elastic deformation in the width direction (in this respect, in contrast to the cited reference 1), so that the fit of the front body F is significantly improved. As a result, the back body The difficulty of shifting B is made stronger. That is, the lower abdomen is the region where the lower abdomen abutment region fd is the most difficult to shift because the stomach is not significantly expanded or contracted or deformed due to the movement of the body before or after eating or the body compared to the iliac region on the upper side. Therefore, the diaper can be firmly supported on the body by making the tightening force of the lower abdomen contact region fd strongest. Further, by making the tightening force of the iliac abutment region fi the weakest, it is possible to flexibly follow the belly expansion / contraction and deformation. In addition, if the tightening force of the iliac abutment region fi is weakened, the slippage is easily lost, but in the present invention, the tightening force of the front waist edge region fw is stronger than the iliac abutment region fi, and the lower abdomen abutment region Since the tightening force of fd is the strongest, the regions on both sides in the longitudinal direction of these iliac abutment regions fi serve as support, and the iliac abutment region fi can be prevented from being displaced. Therefore, both the static fit and the dynamic fit in the front body F are improved, and the effect of preventing slippage is excellent. As a result, the back body B is more difficult to slip.

In the exterior sheet 12, the tightening force of the rear waist edge region bw, the rear intermediate region bi, and the rear lower end side region bd can be determined as appropriate, but the tensile force during elastic deformation in the width direction of the rear waist edge region bw is determined. when F _bw, and the elastic deformation when tensile force in the width direction of the rear intermediate region bi and F _bi, F _bw = F _fw, and F when the _bi ≦ F _fi is configured to satisfy the relation preferable, The rear intermediate region bi rear end corresponding to the rear end of the interior body 200 in the rear intermediate region bi is more elastic in the width direction than the portion corresponding to the rear end of the rear intermediate region bi in the iliac contact region fi. It is preferable that the tensile force during deformation is weak (F _bi <F _fi ). As a result, the rear end portion of the interior body 200 is strongly pulled forward by the iliac abutment region fi of the front body F and deployed in the left-right direction. The movement to the crack side is further suppressed. Thereby, it can further prevent that the interior body 200 of the back body B shifts to the rupture side.

Here, as described above, the tensile force at the time of elastic deformation means the tensile force (gf) at an elongation of 150% when the natural length in the width direction is 100%, and the both side seal portions 12A are peeled off. The diaper is expanded, and the entire target region (for example, the lower abdomen contact region fd) is cut out from the diaper (including the interior body in the region overlapping the interior body 200), and the side seal portions 12A at both ends in the width direction are subjected to a tensile test. It can be measured by grasping with a machine and performing a tensile test at a tensile speed of 300 mm / min along the diaper width direction. The tensile force during elastic deformation of each region can be determined as appropriate. However, as a result of experiments by the present inventors, the tensile force F _fw during elastic deformation in the width direction of the front waist edge region _fw is about 50 to 250 gf. bone contact area width direction of the elastic deformation tensile force F _fi of fi about 25～150Gf, abdominal contacting region elastic deformation when tensile force F _fd in the width direction of fd is preferably in the range of about 75～300Gf, force F _bw pulling when the width direction of the elastic deformation of the rear waist edge region bw about 50～250Gf, the width direction of the elastic deformation tensile force F _bi rear intermediate region bi about 75～300Gf, the lower rear end side region bd The tensile force F _bd during elastic deformation in the width direction is preferably about 75 to 300 gf.

  The magnitude relationship of the tensile force at the time of elastic deformation in the front waist edge region fw, the iliac contact region fi, and the lower abdomen contact region fd of the exterior sheet 12 is well known, such as being formed by jointing using different members in each region. It can form by the method of. In particular, as shown in the drawing, in order to form the exterior sheet 12 by bonding the two sheet base materials 12S and 12H with an adhesive such as a hot melt adhesive, and to improve the fit to the waist, each region fw, fi, A general-purpose structure in which elongated elastic elastic members 14 to 20 such as thread rubber are provided between the sheet base materials 12S and 12H in fd, bw, bi, and bd is preferable because it is simple and easy to manufacture. Of course, the elastic nonwoven fabric (meaning that the nonwoven fabric itself elastically expands and contracts at least in the width direction without the addition of elastic elastic members such as thread rubber, for example, disclosed in Japanese Patent Application Laid-Open No. 2008-156785 and Japanese Patent Application Laid-Open No. 2001-200460. Etc.) or a sheet-like elastic stretchable member such as a rubber sheet, or a part or all of the region may be elastically stretched.

  The illustrated form will be further described. In the exterior sheet 12, the inner sheet base 12H located on the inner side extends only to the edge of the waist opening WO, but the outer sheet base 12S is the waist of the inner sheet base 12H. It wraps around the side edge and is folded back inside, and the folded portion 12r extends so as to cover the end of the interior body 200 on the waist side.

The sheet base materials 12S and 12H can be used without particular limitation as long as they are in sheet form, but are preferably non-woven fabrics. The nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. When using a nonwoven fabric, it is preferable that the basic weight shall be about 10-30 g / m < ² >.

  In the exterior sheet 12, elongated elastic elastic members 14 to 20 such as thread rubber are provided at a predetermined elongation rate between the sheet base materials 12 </ b> S and 12 </ b> H in order to improve fit to the waistline. As the elongated elastic elastic members 14 to 20, synthetic rubber or natural rubber may be used. For bonding the two sheet base materials 12S and 12H of the exterior sheet 12 and fixing the elongated elastic elastic members 14 to 20 sandwiched therebetween, hot melt bonding or heat sealing or ultrasonic bonding by various coating methods is used. Can do.

More specifically, between the inner side surface of the inner sheet substrate 12H and the outer surface of the folded portion 12r of the outer sheet substrate 12S in the front waist edge region fw and the rear waist edge region fw, the entire width direction is extended. In a state where a plurality of front waist edge elastic elastic members 17 and a plurality of rear waist edge elastic elastic members 17 are stretched along the width direction at a predetermined elongation rate with a plurality of intervals in the vertical direction so as to be continuous. It is fixed. Of the front waist edge elastic elastic member and the rear waist edge elastic elastic member 17, one or a plurality of elastic members arranged on the crotch side may overlap with the interior body 200, or the interior body 200. They may be provided on both sides in the width direction except for the central portion in the width direction that overlaps with each other. The front waist edge elastic elastic member 17 and the rear waist edge elastic elastic member 17 have a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1). .5 mm ² , especially about 0.1 to 1.0 mm ² ), and 3 to 22 thread rubbers with an interval of 4 to 12 mm, and an elongation rate of 150 to 400%, particularly about 220 to 320%, respectively. Can do. Further, the front waist edge elastic elastic member and the rear waist edge elastic elastic member 17 need not all have the same thickness and elongation rate. For example, the thickness of the elastic elastic member at the upper and lower portions of the waist edge W The expansion rate may be different.

Moreover, between the outer surface of the inner sheet base material 12H and the inner surface of the outer sheet base material 12S in the iliac contact region fi and the posterior intermediate region bi, except for the central portion in the width direction that overlaps the interior body 200, A plurality of iliac elastic elastic members 19 and posterior intermediate elastic members 15 made of an elongated elastic elastic member are respectively provided in the vertical direction so as to be continuous over the entire width direction of each part on both sides in the width direction. And it is being fixed in the state extended | stretched along the width direction with the predetermined expansion | extension rate. The iliac elastic member 19 and the posterior intermediate elastic member 15 have a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm). ² , especially about 0.1 to 1.0 mm ² ), about 1 to 15 mm, especially about 3 to 30 at an interval of 3 to 8 mm, respectively, with an elongation of about 200 to 350%, especially about 240 to 300%. Can be fixed.

Moreover, the width direction center part which overlaps with the interior body 200 is excluded between the outer surface of the inner sheet base 12H and the inner surface of the outer sheet base 12S in the lower abdomen contact region fd and the rear lower end side region bd. A plurality of lower abdominal elastic elastic members 20 and rear lower elastic elastic members 14 made of an elongated elastic elastic member are spaced apart in the vertical direction so as to be continuous over the entire width direction of each part on both sides in the width direction. And fixed in a state of being stretched along the width direction at a predetermined stretch rate. The lower abdomen elastic elastic member 20 and the rear lower end elastic elastic member 14 have a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm). ² , especially about 0.1 to 1.0 mm ² ), about 1 to 15 mm, especially about 3 to 30 at an interval of 3 to 8 mm, respectively, with an elongation of about 200 to 350%, especially about 240 to 300%. Can be fixed.

Further, in the illustrated form, a central portion in the width direction that overlaps the interior body 200 between the outer surface of the inner sheet base 12H and the inner surface of the outer sheet base 12S in the intermediate portion L of the front body F and the rear body B. Except for a plurality of intermediate elastic elastic members 16, 18 made of an elongated elastic elastic member so as to be continuous over the entire width direction at each part on both sides in the width direction, with a space in the vertical direction, and It is fixed in a state of being stretched along the width direction at a predetermined stretch rate. The intermediate elastic elastic members 16 and 18 have a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to Thread rubber of about 1.0 mm ² ) can be fixed at an interval of 5 to 40 mm, particularly 5 to 20 mm, and about 2 to 10 at an elongation of 150 to 300%, particularly 180 to 260%.

  As shown in the drawing, the iliac elastic elastic member 19 and the rear intermediate elastic elastic member 15, the lower abdominal elastic elastic member 20, the rear lower elastic elastic member 14, and the intermediate elastic elastic members 16 and 18 are provided in the interior body. If it is provided on both sides in the width direction except for the central portion in the width direction that overlaps with 200, the interior body 200 will not shrink more than necessary in the width direction, and the appearance will be poor and the absorbency will be reduced. There is nothing to do. In this form, in addition to the form in which the elastic elastic members 14 to 16 and 18 to 20 exist only on both sides in the width direction, the elastic elastic members 14 to 16 and 18 cross the interior body 200 from one side in the width direction to the other side. However, the elastic elastic members 14 to 16 and 18 to 20 are finely cut at the central portion in the width direction overlapping the interior body 200, and the contraction force does not act (substantially, the elastic elastic member is It is equivalent to not providing) that includes a configuration in which only both sides in the width direction are configured as contraction force acting portions. Of course, the arrangement form of the elastic stretch members 14 to 16 and 18 to 20 is not limited to the above example, and the elastic stretch members 14 to 16 so that the stretch force acts over the entire width of the front body F and the back body B. , 18 to 20 can be provided from one side to the other side in the width direction across the interior body 200.

  And these front waist edge elastic elastic members and rear waist edge elastic elastic members 17, iliac elastic elastic members 19 and posterior intermediate elastic elastic members 15, lower abdominal elastic elastic members 20 and rear lower elastic elastic members 14. In order to satisfy the above-described magnitude relationship of the tensile force during elastic deformation, at least one of the longitudinal arrangement interval, the thickness, the elongation rate at the time of fixation, and the number is determined. For example, the lower abdominal elastic elastic member 20, the front waist edge elastic elastic member 17, and the iliac elastic elastic member 19 are sequentially fixed so as to satisfy the above-described magnitude relationship of the tensile force during elastic deformation in the front body F. The elongation ratio is increased by about 5 to 15%, or the thickness is increased by about 5 to 15%, and the elongation ratio when the lower abdomen elastic elastic member 20 is fixed more than the rear lower end side elastic elastic member 14 is 5 to 15%. %, Or the thickness can be increased by about 5-15%.

  On the other hand, in the present invention, the lower abdomen abutment region fd is tightened most strongly, so that the urine receiving space in the lower abdomen is reduced, and if there is a large amount of urination, there is a risk of leakage. Therefore, the crotch portion of the interior body 200 is contracted in the width direction between the inner sheet base material 12H and the outer sheet base material 12S of the exterior sheet 12 (or the interior body 200) at least in the crotch portion as shown in the illustrated example. While providing a crotch elastic member 13 that bulges outward while expanding the crotch portion of the interior body 200 in the width direction as shown in FIG. It is also a preferable form to enlarge the space between the two. As the crotch elastic elastic member 13 in this case, if a large number of elongated elastic elastic members such as thread rubber are provided in the width direction and spaced apart in the vertical direction, the structure is simple and the manufacturing is easy. preferable. Of course, the elastic nonwoven fabric (meaning that the nonwoven fabric itself elastically expands and contracts at least in the width direction without the addition of elastic elastic members such as thread rubber, for example, disclosed in Japanese Patent Application Laid-Open No. 2008-156785 and Japanese Patent Application Laid-Open No. 2001-200460. Etc.) or a sheet-like elastic stretchable member such as a rubber sheet, or a part or all of the region may be elastically stretched.

When an elongated elastic elastic member is used for the crotch elastic elastic member 13, the elastic elastic member has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05). ˜1.5 mm ² (especially about 0.1 to 1.0 mm ² ) of thread rubber is fixed at intervals of 4 to 12 mm at about 3 to 22 stretches of 150 to 400%, particularly about 220 to 320%, respectively. can do.

(Large elastic part)
Characteristically, as shown in FIG. 6, an area of the inner / outer fixing part 300 that fixes the outer sheet 12 and the inner body 200, both side edges of the portion 304 located in the rear lower end side area bd of the inner / outer fixing part 300. Is located in the vicinity of both side edges (or the same) of the interior body, and the width X2 of the portion 301 located in the lower abdomen contact region fd of the inner and outer fixing portions 300 is the portion 304 located in the rear lower end side region bd. In the front body F, the lower abdomen elastic elastic member 20 extends to the vicinity of the side edge of the narrow inner / outer fixing portion 301, and in the rear body B, the wider inner / outer fixing portion 304 By extending the rear lower end side elastic expansion / contraction member 14 to the vicinity of the side edge, the width of the elastic expansion / contraction range in the lower abdomen contact region fd is configured wider than the width of the elastic expansion / contraction range in the rear lower end side region bd. Yes. Hereinafter, the longitudinal direction region of the wide elastic stretchable range is also referred to as a large stretchable portion EX.

  The range in which the large stretchable portion EX is provided is not limited to the lower abdomen contact region fd as long as it includes the lower abdomen contact region fd, but can also be a range including the iliac contact region fi as in the illustrated example. Therefore, in the illustrated example, a part of the iliac elastic member 19 is extended to the vicinity of the side edge of the narrow inner / outer fixing portion 301 in the front body F, and the intermediate elastic member 15 in the rear body B. Is extended to the vicinity of the side edge of the wide inner / outer fixing portion 304, so that the width of the elastic expansion / contraction range in a part of the iliac abutment region fi is reduced in a part of the posterior intermediate region bi. It is configured wider than the width of the elastic expansion / contraction range.

  The longitudinal range of the large stretchable part EX can be determined as appropriate according to the dimensions of the diaper. In normal cases, the rear end (the edge of the waist opening WO of the back body B) of the total length Y of the diaper is 0%. When the front end (the edge of the waist opening WO of the front body F) is defined as 100%, it is preferably in the range of 4 to 30%.

  The width X2 of the inner / outer fixing part 301 in the large expansion / contraction part EX is not particularly limited as long as it is narrower than the width X3 of the inner / outer fixing part 304 of the back body B, and can be determined as appropriate. It is preferably about 7 to 70% of the width X4. Incidentally, the width X4 of the interior body 200 can be determined as appropriate, but is preferably about 20 to 50% of the total width X of the diaper.

  The width X3 of the inner and outer fixing portions 304 of the back body B is preferably about 70 to 95% of the width X4 of the interior body 200. The widths of the inner and outer fixing portions 302 and 303 in the portions EF and EB near the front and rear of the large stretchable portion EX are wider than the large stretchable portion EX, for example, approximately the same as the width X3 of the inner and outer fixed portions 304 of the back body B. desirable. In addition, it is preferable that the longitudinal length of the inner and outer fixing portions 302 and 303 on both the front and rear sides EF and EB of the large stretchable portion EX is about 2 to 20% of the total length Y of the diaper. In addition, the dimension of each part of a diaper means the length in the expansion | deployment state which does not shrink | contract by an elastic member fundamentally.

  In addition, when making the end of the width direction center side of the back lower end side elastic elastic member 14 and the iliac part elastic elastic member 19 near the side edges of the inner and outer fixing parts 301, 302, 303, the distance is not particularly limited, In a normal case, it is preferable that the distance from the side edges of the inner and outer fixing portions 301, 302, and 303 is about 30 mm to the center in the width direction and the outer side in the width direction. In this way, when the width of the inner / outer fixing part 300 of the front body F is narrowed at least in the lower abdomen contact area, and the width of the elastic expansion / contraction range is expanded only by that part, the elastic expansion / contraction range narrowed in the rear body is compensated in the front body, Appropriate and sufficient stretchability can be ensured in the entire circumferential direction of the diaper in the longitudinal region corresponding to the swelling of the diaper, and the fit to the heel portion is excellent.

(Exterior sheet split structure)
In the above-described example, the front body F to the back body B are continuously covered with the integral exterior sheet 12, but as shown in FIG. 9, the exterior sheet 12 covers the abdomen side of the waist of the wearer. It is divided into an abdominal exterior sheet 12F that covers and a back exterior sheet 12B that covers the back side, and the front end of the interior body 200 is connected to the inner surface of the central part in the width direction of the abdominal exterior sheet 12F by a hot melt adhesive or the like. In addition, the rear end portion of the interior body 200 is connected to the inner surface of the central portion in the width direction of the back side exterior sheet 12B by a hot melt adhesive or the like, and the abdominal side exterior sheet 12F and the back side exterior sheet 12B are on the crotch side. It is also possible to adopt a form that is not continuous and spaced apart. This separation distance can be about 150 to 250 mm. In this case, the back surface of the liquid-impervious backsheet in the interior body 200 is a part of the portion exposed so as to cover the entire back surface of the interior body 200 or between the ventral exterior sheet 12F and the back exterior sheet 12B. The crotch outer sheet can also be fixed so as to cover a part or the whole. As the crotch outer sheet, the same material as that used for the outer sheet described above can be used.

(Post-processing tape)
A post-processing tape 70 (fixing means) can be provided at the center in the width direction on the outer surface of the rear body B of the exterior sheet 12. The post-processing tape 70 is for fixing the diaper 100 in a state where the diaper 100 is rolled or folded so that the topsheet 30 is on the inside and the front body F is on the inside. As shown in FIG. 5, in the general post-processing tape 70, a base end portion 71 is fixed to the outer surface of the exterior sheet 12 with an adhesive or the like, and a portion on the front end side of the base end portion 71 is tri-folded. (Folded in a Z-shaped cross section) or folded in half, and the portion between the folded portions is fixed (temporarily fixed) by the temporary fixing adhesive 72 so as to be peelable. Moreover, while having the knob | pick part 73 colored in opaque colors, such as white, in the front-end | tip part, the part except this knob | pick part 73 is transparent or semi-transparent, Through the transparent or semi-transparent part in this post-processing tape 70, A design to be described later is visible from the outer surface side of the post-processing tape 70. Although a specific structure can be appropriately configured, in the illustrated embodiment, the whole is formed by connecting a plurality of transparent or semi-transparent substrates in the longitudinal direction, and a colored tape 74 is bonded to the knob 73. Is adopted.
At the time of disposal, the diaper 100 is rolled or folded so that the topsheet 30 is on the inside and the front body F is on the inside, and then the folded portion of the post-processing tape 70 is peeled off and spread, and the diaper 100 is rolled or folded. The diaper 100 is fixed with an adhesive so as to be wound from the rear body B of the diaper 100 to the outer surface on the opposite side over the waist opening WO. The post-processing tape 70 is particularly preferably a tri-fold shape that can be folded compactly when not in use and can be expanded into a long shape when in use.
Fixing means such as the post-processing tape 70 may be provided on the front body F or on both the back body B and the front body F.

  The present invention can be used for a pants-type disposable diaper as in the above example.

  DESCRIPTION OF SYMBOLS 11 ... Liquid impervious back sheet, 12 ... Exterior sheet, 12r ... Folded part, 25 ... Print sheet, 200 ... Interior body, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorbing element, 56 ... Absorber, 58 ... packaging sheet, 60 ... side solid gather, 62 ... gather sheet, fw ... front waist edge region, fi ... iliac contact region, fd ... lower abdomen contact region, bw ... back waist edge region, bi ... Rear intermediate region, bd ... rear lower end region.

Claims (5)

The side seal part is formed by joining the both sides of the exterior sheet forming the front body extending from the crotch part to the ventral side and the both sides of the exterior sheet forming the back body extending from the crotch part to the back side. A waist opening for passing the wearer's torso and a pair of left and right leg openings for passing the legs,
The inner body including the absorber is fixed to the central portion in the width direction inside the outer sheet,
In the pants-type disposable diaper in which the three-dimensional gathers protruding from the inner surface of the diaper are respectively extended along the front-rear direction on both sides in the width direction of the interior body,
Of the exterior sheet forming the front body and the exterior sheet forming the back body, at least the longitudinal regions having the side seal portions are configured to elastically expand and contract in the width direction, respectively.
The longitudinal region having the side seal portion of the exterior sheet forming the front body is located on the crotch side from the front waist edge region that forms the edge of the waist opening and the front waist edge region, and is mounted An iliac abutment region that abuts the person's iliac region, and a lower abdomen abutment region that abuts the wearer's lower abdomen,
The longitudinal region having the side seal portion of the exterior sheet forming the back body is a rear waist edge region corresponding to the front waist edge region, a rear intermediate region corresponding to the iliac contact region, A rear lower end side region corresponding to the lower abdomen contact region,
F _{fw is} the tensile force during elastic deformation in the width direction of the front waist edge region, F _{fi is} the tensile force during elastic deformation in the width direction of the iliac contact region, and elastic deformation in the width direction of the lower abdomen contact region. Assuming that the tensile force at the time is F _fd and the tensile force at the time of elastic deformation in the width direction of the rear lower end side is F _bd , the relationship of F _fd > F _fw > F _{fi and} the relationship of F _fd > F _bd are satisfied. Configured
A pants-type disposable diaper characterized by that. Of the inner and outer fixing parts for fixing the exterior sheet and the interior body, both side edges of the portion located in the rear lower end side region are located in the same or in the vicinity of both side edges of the interior body,
Of the inner and outer fixed parts, the width of the part located in the lower abdomen contact area is narrower than the width of the part located in the rear lower end side area,
The width of the elastic expansion / contraction range in the lower abdomen contact region is wider than the width of the elastic expansion / contraction range in the rear lower end side region,
The pants-type disposable diaper according to claim 1.   The rear intermediate region rear end corresponding to the rear end of the interior body in the rear intermediate region is more elastically deformed in the width direction than the portion corresponding to the rear intermediate region rear end in the iliac contact region. The pants-type disposable diaper according to claim 1 or 2, wherein the tensile force is weak.   The crotch part elastic elastic member which bulges outside while shrinking the crotch part of the interior body in the width direction is provided at least in the interior body or the exterior sheet in the crotch part. The listed pants-type disposable diapers. The exterior sheet that forms the front body is an integral sheet base material extending at least over the front waist edge region, the iliac contact region, and the lower abdomen contact region, and the front waist edge region of the sheet base material in the longitudinal direction. A number of elongated front waist edge elastic elastic members along the width direction, which are fixed in an extended state in the width direction at intervals, and a width direction in the longitudinal direction at the iliac contact region in the sheet base material Numerous elongated iliac elastic members extending in the width direction fixed in the stretched state, and many fixed in the widthwise stretched state in the lower abdomen abutment region of the sheet base material in the longitudinal direction. An elongated lower abdomen elastic elastic member along the width direction of
The exterior sheet forming the back body has a longitudinally spaced space between an integral sheet base material extending at least a rear waist edge region, a rear intermediate region and a rear lower end side region, and a rear waist edge region of the sheet base material. A plurality of elongated rear waist edge elastic elastic members along the width direction fixed in the width direction extended state, and fixed in the width direction extended state with a space in the rear intermediate region of the sheet base material in the vertical direction. A plurality of elongated rear intermediate elastic members extending along the width direction, and a plurality of elongated shapes along the width direction fixed in the width direction extending in the longitudinal direction at the rear lower end side region of the sheet base material And a rear lower end side elastic elastic member,
Vertical spacing between the front waist edge elastic elastic member, the iliac elastic elastic member and the lower abdominal elastic elastic member, and between the lower abdominal elastic elastic member and the rear lower elastic member By changing at least one of the thickness, the expansion rate at the time of fixation, and the number, the relationship of F _fd > F _fw > F _{fi and} the relationship of F _fd > F _bd are satisfied.
The underpants type disposable diaper of any one of Claims 1-4.

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