CN1658812A - Absorbing article - Google Patents

Abstract

Provided is an absorbent article composed of a plurality of overlapping sheets. The article has side edges (1a, 1b) extending longitudinally and end edges (1c, 1d) opposite to the longitudinal direction, and is formed lengthwise. Within a predetermined length (La) extending longitudinally across the transverse centerline (Ox-Ox) of the article, a first group of crimping portions are provided inside each side edge portion (1a, 1b). The first group of crimping portions are arranged in a row following the shapes of the side edge portions (1a, 1b) at appropriate intervals, and have non-crimping regions on both sides of the row.

Description

absorbent article

Associate application

This application claims priority based on Japanese Patent Application No. 2002-167948 filed on June 7, 2002. The contents of the publication of the above-mentioned Japanese patent application are incorporated as part of the publication of this specification.

technical field

The present invention relates to an absorbent article called a panty liner, which is used as an absorbent sheet for absorbing leucorrhea or menstrual blood, an absorbent sheet for incontinence urine, and a sanitary napkin for absorbing menstrual blood on days when menstruation is low, and particularly relates to Absorbent articles that are bonded to underpants when in use.

Background technique

Absorbent sheets called pantiliners are widely used as absorbent articles for absorbing vaginal discharge or menstrual blood. This absorbent sheet is used by being bonded and fixed to the inner side of the crotch portion of the underwear through the pressure-sensitive adhesive layer. The conventional absorbent sheet generally has a structure in which a thin absorbent layer such as laminated tissue or air-laid pulp is interposed between a liquid-impermeable backsheet and a topsheet formed of spunlace nonwoven fabric or the like.

Ideally, the absorbent layer should be thin, so that the user can feel the same soft feeling as underwear, and it is not easy to twist or deform due to the movement of the thigh in use. The surface on the liquid receiving side must always be It is a state that can maintain close contact with the excretory organs of the user's body.

However, such a panty liner is less frequently replaced in a day than a commonly used menstrual napkin and the like, and one panty liner is usually used for a long time. Therefore, deformation stress acts on the panty liner continuously for a long time due to the movement of the thigh during use, and thus tends to twist or deform. When such wrinkles or deformations become conspicuous, there are likely to be problems such as that the surface area is substantially reduced, the liquid absorption capacity is reduced, and close contact with excretory organs is reduced, and excreted liquid cannot be captured reliably.

Such a problem has been noticed, for example, in Japanese Unexamined Patent Application Publication No. 2001-276126, which is a panty liner in which an elastic layer is sandwiched between a top sheet and an absorber. In addition, in the panty liner, the top sheet, the absorbent layer, the elastic layer, and the leak-proof sheet on the bottom are compressed and fixed by a plurality of compressed portions formed inside the side edges of the panty liner. The panty liner utilizes the elastic force of the elastic layer to apply an elastic restoring force to the distortion generated during use, thereby preventing the distortion and improving the fit.

However, even with the panty liner having the elastic layer as described above, if force is repeatedly applied from both sides in a wet state absorbed body fluid, since the force is directly transmitted to the central region, it is difficult to avoid Large creases or deformations from the side edges of the panty liner to the central area.

In addition, in the panty liner described in the above-mentioned publication, since the compressed portions provided inside the both side edges of the panty liner have a relatively large area and are formed at large intervals, the above-mentioned wrinkles or deformations occur in adjacent compressed areas. Extends between the parts, easy to reach the central area. In addition, since each of the compression parts has a relatively large area, if the compression parts are made rigid, the compression parts may come into contact with the female genitalia, and the user may feel uncomfortable.

The present invention is made in consideration of the above-mentioned conventional technical problems, and aims to provide an absorbent article that does not hinder the overall soft feeling, hardly transmits pressure from the thighs to the central region, and does not easily cause wrinkles or deformation. of absorbent articles.

Contents of the invention

In the first aspect of the present invention, there is provided an absorbent article formed of a plurality of overlapping sheets, having side edges extending in the longitudinal direction and end edges facing the longitudinal direction, and being formed lengthwise.

Within a predetermined length extending longitudinally across the transverse centerline of the article, a plurality of crimping portions of the first group are arranged on the inside of each of the side edge portions, and the crimping portions of the first group have appropriate intervals, The side edges are arranged in rows following the shape of the respective side edges, and there are non-press-bonding regions on both sides of the row.

This absorbent article is used by being bonded to the inner surface of the crotch of the panties, and the pressure from the thighs acts on both side edges. On the inner side of each of the above-mentioned side edge parts, since the crimping parts have intervals and are arranged in a row following the side edge parts, and there are non-crimping regions on both sides thereof, therefore, since the adjacent ones arranged along the row The difference in rigidity or thickness between the non-crimped parts left between the crimped parts and the non-crimped areas extending on both sides of the column and the respective crimped parts, the crimped parts and the above-mentioned non-crimped parts and non-crimped parts Subtle deformations occur between regions. Here, since the energy of the above-mentioned pressure is absorbed by the minute deformation, the pressure from the outside is less likely to have a large influence on the central region of the article. Therefore, it is possible to prevent deformation such as large wrinkles and twists in the central region.

As mentioned above, in order to absorb the pressure acting on the two side edges with the slight deformation inside the two side edges, the interval between adjacent crimping parts in the above-mentioned row is preferably 0.5 to 5mm, and the bottom surface area of the above-mentioned crimping parts Preferably, it is 0.25 to 6 mm ² .

When the above-mentioned area is within the above-mentioned range, it is preferable that at least some of the crimping parts of the first group have round, elliptical or polygonal bottom surfaces and are arranged at regular intervals along the above-mentioned row. However, the crimping portion is not limited to the above-mentioned shapes, and may have other various shapes such as a star shape and a moon shape.

In the present invention, each of the side edge portions has a concave curve shape, and the row formed by the crimping portions of the first group is also preferably a concave curve shape.

In this case, although the pressure from the thigh acts on the edge of the concave curve shape, since the crimping parts are arranged along the above-mentioned concave curve, each crimping part and the corresponding crimping parts arranged along the concave curve The non-crimped portion between the adjacent crimped portions can absorb the pressure from the above-mentioned thigh portion.

Furthermore, it is preferable that the plurality of crimping parts of the second group are provided inside the first group of crimping parts, and there is a non-crimping area between the first group of crimping parts and the second group of crimping parts.

With this structure, the second group of crimping parts can prevent the deforming force acting on the central region over the first group of crimping parts arranged in a row, further preventing wrinkles or twisting in the central region.

The bottom surface area of the second group of crimping parts is also preferably 0.25-6 mm ² .

In the second aspect of the present invention, there is provided an absorbent article comprising a plurality of overlapping sheets, having side edges extending in the longitudinal direction and end edges facing the longitudinal direction, and being formed lengthwise.

On the inner side of each of the above-mentioned side edge parts, there are respectively provided non-crimping demarcation areas of a predetermined area surrounded by a plurality of crimping parts. The above-mentioned divided regions are arranged along the above-mentioned respective side edges.

In this absorbent article, when pressure is applied from the thighs to the side edges, the slight deformation caused by the rigidity difference between each crimped portion and the non-crimped portion remaining between adjacent crimped portions not only Stress can be prevented from spreading to the central area. The non-crimped divided area absorbs the pressure from the outside, and deformation such as wrinkles or distortion is difficult to propagate to the central area. The non-crimped divided area is formed by multiple crimped parts. Enclosed, inside which the sheets are elastically deformable.

In this case, it is preferable that the plurality of divided regions arranged along the respective side edges have the same shape and the same area.

According to such a configuration, the partitioned areas can exert an equal external pressure absorbing effect, and can form a beautiful pattern appearance.

In this case, it is preferable that at least some of the plurality of crimping portions surrounding the region have circular, elliptical or polygonal bottom surfaces, and the bottom surface area of the crimping portions is preferably 0.25-6 mm ² .

If the minimum dimension in the transverse direction of the non-crimping region sandwiched between the crimping portion inside one side edge and the crimping portion inside the other side edge is 20 mm or more, it is difficult for the crimping portion to The female genitalia has a sense of rigidity. In addition, when the absorbent article is used as a pad for leucorrhea absorption in consideration of the above-mentioned external pressure absorbing effect, the above-mentioned minimum size is preferably 20 to 35 mm.

On the non-crimping area sandwiched by the crimping part located inside one side edge part and the crimping part located inside the other side edge part, the sheet exposed on the outermost surface of the article is formed. In the present invention, the most It is best if the furrows extend longitudinally and alternate transversely.

As described above, if at least the center of the surface is in the form of a ridge, making the central region soft can reduce irritation when it comes into contact with the user's body. In this way, even if the central region is soft, since the pressure acting on both side edges is easily absorbed by the crimping portion, it is easy to prevent large wrinkles or distortions in the soft central region.

Description of drawings

The present invention can be understood in more detail through the following detailed description and the accompanying drawings of suitable embodiments of the present invention, but is not limited to the present invention, but only for the convenience of illustration and understanding.

Fig. 1 is a plan view showing an absorbent sheet of an absorbent article according to a first embodiment of the present invention.

Fig. 2 is a half sectional view taken along line II-II of Fig. 1 .

FIG. 3 is an enlarged view of a part of the sectional view of FIG. 2 .

FIG. 4A is a partial plan view showing an arrangement of crimping portions of one side fixing portion in FIG. 1 , and FIG. 4B is a further enlarged plan view showing a part thereof.

Fig. 5 is a plan view showing an absorbent sheet according to a second embodiment of the present invention.

Fig. 6 is a plan view showing an absorbent sheet according to a third embodiment of the present invention.

Fig. 7 is a plan view showing an absorbent sheet according to a fourth embodiment of the present invention.

Fig. 8 is a plan view showing an absorbent sheet according to a fifth embodiment of the present invention.

Fig. 9 is a plan view showing an absorbent sheet according to a sixth embodiment of the present invention.

Detailed ways

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the following description many specific details are set forth in order to provide a complete understanding of the invention, but it should be self-evident to those skilled in the art that the invention can be formed without these specific details. In addition, in order to avoid unnecessary ambiguity, well-known structures of the present invention will not be described in detail.

As a thin absorbent article according to the first embodiment of the present invention, FIG. 1 is a plan view showing an absorbent sheet 1 (called a panty liner) for absorbing leucorrhea or menstrual blood with the surface side facing the front, and FIG. Cut off on the central line Ox-Ox (the absorbent sheet shown in Figure 1 is divided into two vertically), and look at the half-sectional view of the right half of the section of the absorbent sheet 1 from the direction of II, and Figure 3 is a half-sectional view showing the exposed FIG. 2 is an enlarged sectional view of the structure of the crimping portion in the half-sectional view, and FIGS. 4A and 4B show an arrangement pattern of the crimping portion on one side fixing portion.

The absorbent sheet 1 shown in this embodiment is a thin absorbent article used as a body that is bonded to the inside of the crotch of women's underwear and integrated with the underwear to absorb leucorrhea excreted by women or menstrual blood at the onset of menstruation, etc. for purpose. In addition, the thin absorbent article of the present invention is used by being bonded to the inside of the crotch of panties, and can also be used as an article for absorbing a small amount of urine during urinary incontinence.

As shown in the plan view of FIG. 1 , the absorbent sheet 1 has a vertically elongated shape and has a right edge 1a and a left edge 1b extending longitudinally, and a front end 1c and a rear edge 1d facing the longitudinal direction. The right side edge 1a and the left side edge 1b have a concave curve shape, and when the absorbent sheet 1 is bonded to the inside of the crotch of the panties, the right side edge 1a and the left side edge 1b are along the leg openings of the panties. edge of the section. Furthermore, the front end edge portion 1c and the rear end edge portion 1d are in a convex curve shape.

As shown in plan view, the absorbent sheet 1 has a left-right symmetrical shape with respect to the longitudinal center line Oy-Oy, and a front-rear symmetrical shape with respect to the transverse center line Ox-Ox. However, this kind of absorbent sheet 1 may have an asymmetric shape front-back with respect to the above-mentioned transverse center line Ox-Ox. Even the absorbent sheet 1 having this asymmetric shape can have the following configurations.

As shown in FIG. 2 , the absorbent sheet 1 has a main body portion 2 which is a laminate of a backsheet 3 , a middle sheet 4 provided on the backsheet 3 , and a topsheet 5 provided on the middle sheet 4 .

As shown in FIG. 2 , a pressure-sensitive adhesive layer 6 for bonding to underwear is provided on the bottom surface of the main body portion 2 , that is, on the outer surface of the backsheet 3 . The pressure-sensitive adhesive layer 6 is provided in the shape of parallel strips extending linearly in the longitudinal direction (Y direction) and separated from each other in the lateral direction (X direction). Before use, the outer surface of the pressure-sensitive adhesive layer 6 is covered with a release paper 7 .

The above-mentioned back sheet 3, intermediate sheet 4, top sheet 5, and release paper 7 have the same shape when viewed from above. In the manufacturing process, the bottom sheet 3, the middle sheet 4, the top sheet 5 and the release paper 7 are overlapped and cut out, as shown in Figure 1, with a right edge 1a, a left edge 1b, a front edge 1c and a rear The shape of the edge portion 1d.

In this embodiment, the said right side edge part 1a and the left side edge part 1b are concave curve shape in the range of the vertical dimension La. In the above-mentioned range of La, the right side fixing portion 10 is formed inside the above-mentioned right edge portion 1a. On the right side fixing part 10, crimping parts are arranged following the concave curve shape of the above-mentioned right side edge part 1a. Likewise, in the range of La, the left side fixing portion 11 whose crimping portion follows the concave curve shape of the left edge portion 1b is formed inside the left edge portion 1b.

Inside the front end edge portion 1c, there is provided a front fixing portion 12 in which crimping portions are arranged following the concave curve shape of the front end edge portion 1c. Inside the rear edge portion 1d, there is provided a rear fixing portion 13 in which crimping portions are arranged following the concave curve shape of the above-mentioned rear edge portion 1d.

The bottom sheet 3, the intermediate sheet 4 and the top sheet 5 forming the above-mentioned main body portion 2 are bonded and fixed to each other by a hot-melt adhesive that does not hinder the penetration and absorption of liquid in the form of a net, Comb-shaped or spiral-shaped, etc. are applied, and each piece is heated, pressed and fixed on the above-mentioned right side fixing part 10, left side fixing part 11, front fixing part 12 and rear fixing part 13.

The above-mentioned backsheet 3 is liquid-impermeable, and is, for example, a thin polyethylene film with a paper weight in the range of 21 to 25 g/m ² . Specifically, the film can be formed by melting and extruding a polyethylene resin containing an inorganic filler, and stretching it so that many fine air holes are formed due to the presence of the inorganic filler. Alternatively, the above-mentioned backsheet 3 is a hydrophobic spun-bonded nonwoven fabric or a point-bonded nonwoven fabric, and if necessary, an air-permeable resin film may be laminated thereon.

Since the middle sheet 4 has a liquid absorption function, such as a spunlace nonwoven fabric, as hydrophilic fibers, it contains: 55% by mass of rayon fibers with a fiber degree of 1.38 dtex and a fiber length of 44mm, and a fiber degree of 30% by mass. Polyester fibers with a fiber density of 1.43 dtex and a fiber length of 38 mm and 15% by mass polypropylene fibers with a fiber density of 1.65 dtex and a fiber length of 45 mm may have a weight per unit area of 30 to 50 g/m ² .

The topsheet 5 is formed of two liquid-permeable nonwoven fabrics, the first topsheet 5a and the second topsheet 5b.

The first top sheet 5a and the second top sheet 5b are all formed by the spun-bonded non-woven fabric that the polypropylene resin fiber of fiber degree is 1.98～2.64dtex, and the weight per unit area of the first top sheet 5a is at 20～25g/ The range of ^m2 , the weight per unit area of the second top sheet 5b is in the range of 20～30g/ ^m2 . The spunbonded nonwoven can also have a plurality of liquid-permeable holes.

As shown in FIG. 1, the first top sheet 5a is provided with a groove-forming region 15 extending longitudinally in a band shape within a predetermined width Wa symmetrical to the center line Oy-Oy. As shown in FIG. 2, in the above-mentioned ridge forming region 15, ridges 15a and grooves 15b extending longitudinally across the entire top sheet 5a alternate at a constant pitch in the lateral direction.

The height of above-mentioned ridge portion 15a (promptly subtracting the thickness of the first top sheet 5a from the actual height dimension of the first top sheet 5a on the ridge forming region 15) is in the scope of 0.3～2mm, and ridge portion 15a and ditch portion 15b are in the range of 1 Arranged at a pitch of ~3mm. The width of the ditch forming region 15 is 15 to 35 mm.

Since the ditch forming region 15 is arranged at the central part, and extends longitudinally across the length of the entire first topsheet 5a within the predetermined width Wa, it can reduce the stimulation when it comes into contact with the female genitalia, and become a good feeling of use. thing.

The entire second topsheet 5b is the gully forming region 16 . As shown in FIGS. 2 and 3 , in this ridge forming region 16 , ridges 16 a and grooves 16 b extending over the entire length of the second top sheet 5 b also alternate at constant intervals in the lateral direction. The best height range of the ridge portion 16a on the ridge forming region 16 of the above-mentioned second top sheet 5b and the best range of the pitch of the ridge portion 16a and the pitch of the groove portion 16b are the same as those of the ridge forming region of the first top sheet 5a. 15a is the same.

By providing the ditch forming region 16 on the entire second top sheet 5b, even if the entire body portion 2 is thin and the intermediate sheet 4 is of a high-density structure, the cushioning properties on the surface side can be improved. And, by setting the ditch forming regions 15, 16 on the first top sheet 5a and the second top sheet 5b, the central region of the absorbent sheet 1 can be made soft, and this part easily follows the deformation of the crotch of the underwear. Therefore, the degree of closeness to the female genitalia can be improved, and discomfort between the thighs is less likely to be felt during use.

Since the groove forming regions 15 and 16 can be formed by using a pair of rollers having concavities and convexities corresponding to the shape of the grooves and engaging with each other, the spunbonded nonwoven fabric is fed between the rollers heated to 120°C. Ridges and grooves are formed on the nonwoven fabric by this heating and pressing.

As shown in FIG. 4A and FIG. 4B , the above-mentioned right fixing portion 10 is formed by arranging three crimping portions with different sizes and/or shapes. The crimping portion is composed of a small circular first crimping portion 21 , a circular second crimping portion 22 with a slightly larger diameter than the first crimping portion 21 , and a crescent-shaped third crimping portion 23 .

The first crimping portion 21 , the second crimping portion 22 and the third crimping portion 23 are formed by thermal embossing. That is, the roller with a smooth surface is placed on the outside of the bottom sheet 3, the embossing roller with the protrusion corresponding to the above-mentioned crimping part pattern is placed on the first top sheet 5a, and the main body part 2 is clamped in a heated to more than 120 ℃. Heat embossing is performed between the above-mentioned rollers.

2 and 3 show cross-sectional views of the above-mentioned first crimping portion 21 . As shown in this cross-sectional view, the first crimping portion 21 has a bottom surface 21a, and is flattened by the above-mentioned thermal embossing. And, because the bottom sheet 3, the middle sheet 4 and the top sheet 5 contain thermoplastic material, therefore, on the above-mentioned bottom surface 21a, the above-mentioned thermoplastic material is melted, and the bottom surface 21a is planarized by not revealing the unevenness of the fiber, and the surface of the bottom surface 21a is approximately the same as the film. Same face.

As mentioned above, in order to make the bottom surface 21a a smooth film surface, it is preferable that the top sheet 5 contains a thermoplastic material. However, as long as the bottom surface 21a of the crimping portion is not limited to a smooth film, the top sheet 5 does not need to contain a thermoplastic material. For example, when the top sheet 5 is formed from cellulose fibers, etc., and it is impossible to perform heat welding, by bonding the lower surface of the top sheet 5 with the lower layer with a hot-melt adhesive, and performing heat embossing, rigidity can be formed. high above the crimp section.

The same applies to the second crimping portion 22 and the third crimping portion 23. The second crimping portion 22 may have a smoothed circular bottom surface 22a, and the third crimping portion 23 may have a smoothed crescent shape. The bottom surface 23a.

As shown in FIG. 4A , on the right side fixing portion 10 , a first group of crimping portions are arranged in a row along a row L1 which follows the concave curve shape of the right edge portion 1 a. On the first plurality of crimping portions, the first crimping portions 21 and the third crimping portions 23 are regularly arranged. The row L1 in which the crimping parts of the first group are arranged is a concave curve shape similar to the right edge part 1a, and its curvature radius is 120-300 mm. In addition, as shown in FIG. 3 , the edge width from the right edge portion 1 a to the bottom surface 21 a of the first crimping portion 21 , that is, the width of the non-crimping region between the right edge portion 1 a and the right fixing portion 10 Wb is about 1 to 8 mm.

The above-mentioned first group of crimping parts in this embodiment has three first crimping parts 21 and one third crimping part 23 arranged at intervals in the form of repeating at a certain interval along the row L1, along the row L1 L1 is arranged in a column.

In addition, in the right side fixing portion 10 , the crimping portions of the second group are arranged along the row L2 inside the row L1 of the crimping portions of the first group. On the second group of crimping parts, the first crimping parts 21 and the second crimping parts 22 are regularly arranged along the row L2. The second group of crimping parts in the present embodiment is set to have five first crimping parts 21 and one second crimping part 22 arranged at intervals regularly repeating along the column L2. In addition, the second crimping portion 22 constituting the second group of crimping portions is adjacent to the moon-shaped third crimping portion 23 constituting the first group of crimping portions.

The shape of the column L2 in which the second group of crimping parts are arranged is that the arch R1 bulging toward the longitudinal center line Oy-Oy between adjacent second crimping parts 22 repeats in the longitudinal direction, and the arc R1 is repeated in the longitudinal direction between the second crimping parts 22. On R1, the first crimping portions 21 are arranged at intervals at a certain pitch.

Moreover, the first crimping portion 21 and the third crimping portion 23 of the first group of crimping portions arranged along the row L1 and the first crimping portion of the second group of crimping portions arranged along the arch R1 are connected. The crimping portion 21 and the second crimping portion 22 define a divided area 24 . In this divided area 24, the backsheet 3, the intermediate sheet 4, the first topsheet 5a, and the second topsheet 5b are maintained in a non-compression-bonded state after the above-mentioned embossing process. However, as mentioned above, in the divided area 24, the above-mentioned bottom sheet 3, intermediate sheet 4, first top sheet 5a and second top sheet 5b are coated with a hot-melt type in a pattern such as a net, a comb, or a spiral. The adhesives are bonded to each other.

In the row L2, since the arch R1 is repeatedly formed in the longitudinal direction, on the right side fixing portion 10, a plurality of the divided regions 24 of the same area are repeatedly provided along the side edge portion 1a. In addition, the second crimping portion 22 and the third crimping portion 23 are located between adjacent divided regions 24 , and the adjacent divided regions 24 are adjacently formed with these crimping portions therebetween.

The transverse dimension Wc on each bottom of the first crimping portion 21, the second crimping portion 22 and the third crimping portion 23 shown in FIG. The range of 0.5 to 2.5 mm, and the bottom surface area of the crimping portion is preferably in the range of 0.25 to 6 mm ² . If the width of the crimping portion is within the above range and below the pitch of the ridges 15a, and the area thereof is within the above range, it will be difficult to feel the presence of the crimping portion during use. Among the present invention, can form ridge portion 15a and ditch portion 15b on the whole first top sheet 5a, in this case, if the width of crimping portion is in the above-mentioned range, because the existence of crimping portion, ridge portion 15a is out of shape The probability is reduced, and it is difficult to feel the existence of the crimping part during use.

In addition, the interval between the first group of crimped parts along the row L1 and the gap between the second group of crimped parts along the row L2, that is, the non-crimped part 10a between adjacent crimped parts along the row L1 The size of the non-crimped portion 10b between the adjacent crimped portions along the row L2 is preferably about 0.5 to 5 mm. In addition, the maximum lateral distance Wd between the first group of crimping parts and the second group of crimping parts is preferably 3 to 8 mm, and the area of the above-mentioned divided area 24 is preferably in the range of 15 to 50 mm ² . Within this range, due to the elastic deformation of the divided area 24, the force acting on the side edge portions 1a, 1b is less likely to propagate to the central area.

Here, referring to the enlarged FIG. 4B, first focus on the plurality of crimping parts arranged along the column L1 to form the first group. As mentioned above, the crimping parts are arranged in a row along L1, and adjacent There is a non-crimping portion 10a having a size between the crimping portions. Moreover, on both sides of the three first crimping parts 21 arranged along the row L1, there are three first crimping parts 21 arranged along the array, extending in the directions shown in (i) and (ii). In the non-crimping region, each first crimping portion 21 exists independently of each other between the non-crimping regions.

Also, focusing on the plurality of crimping parts forming the second group, as described above, the crimping parts are arranged in a row along the arch R1 of the row L2, and there are gaps between adjacent crimping parts in the row. size of the non-crimp portion 10b. And, on both sides of the five first crimping portions 21 arranged along the arch R1, there are five first crimping portions 21 arranged along the above-mentioned five first crimping portions 21, facing the directions shown in (iii) and (iv). In the extended non-crimping area, each first crimping portion 21 also exists independently of each other between the non-crimping areas in the second group.

That is, in this embodiment, non-crimping regions extending along the crimping portions are formed on both sides of some of the crimping portions in the first group, and the non-crimping regions are formed between the non-crimping regions. The crimping portions exist independently of each other. And, such independent crimping portion groups are arranged intermittently along the above-mentioned row L1. The same applies to the plurality of crimping portions of the second group along the above-mentioned row L2.

The arrangement state of the crimping parts on the left side fixing part 11 and the arrangement state of the above-mentioned crimping parts on the right side fixing part 10 are bilaterally symmetrical. As shown in FIG. 1 , the interval We between the second group of first crimping portions 21 on the right side fixing portion 10 and the second group of first crimping portions 21 on the left side fixing portion 11 is in the transverse direction. The position of the central line Ox-Ox is the narrowest, and the narrowest interval We is 20 to 35 mm. If it is less than the above range, the crimping parts of the right side fixing part 10 and the left side fixing part 11 are likely to come into contact with the labia, etc., which may impair the usability. If the above-mentioned range is exceeded, the interval between the first group of crimping parts arranged along the column L1 and the second group of crimping parts arranged along the column L2 becomes narrow, and the area of the divided area 24 is too narrow, and the area of the divided area 24 is too narrow. Less than sufficient cushioning effect.

As shown in FIG. 1 , on the front fixing portion 12 , the above-mentioned first crimping portions 21 and second crimping portions 22 are regularly arranged along a row following the convex curve shape of the front edge 1c of the absorbent sheet 1 . The rear fixing part 13 is symmetrical to the front fixing part 12 , and the first crimping part 21 and the second crimping part 22 are also regularly arranged and formed. The best width Wc and area on the bottom surface of each crimping part provided on the front fixing part 12 and the rear fixing part 13, and the ideal interval in the arrangement direction are related to the above-mentioned right side fixing part 10 and left side. The fixed part 11 is the same.

When using this absorbent sheet 1 , the release paper 7 on the bottom side is torn off, and the pressure-sensitive adhesive layer 6 is bonded and fixed to the inner side of the crotch of the underwear to use the absorbent sheet 1 .

Since the side edges 1a and 1b of the absorbent sheet 1 are concave curves, when the absorbent sheet 1 is fixed on the crotch of the underwear, the concave curves of the side edges 1a and 1b are aligned with the leg openings of the underwear. The edges are roughly the same.

When the absorbent sheet 1 is used while being fixed to the underwear, the crotch of the underwear is deformed due to the movement of the crotch or the clamping force caused by the thigh. However, since the absorbent sheet 1 is thin as a whole, and the bottom sheet 3, the middle sheet 4, and the top sheet 5 are formed of soft materials, the entire absorbent sheet 1 is easy to follow the deformation of the crotch of the underwear, and there is no gap between the crotches. It is easy to feel uncomfortable. Especially, since on the second top sheet 5b, the ditch forming region 16 is arranged on the entire surface, and on the first top sheet 5a, the strip-shaped ditch forming region 15 is formed in the center, therefore, the center of the absorbent sheet 1 The zone is soft and the central zone easily follows the deformation of the panty. In addition, since the groove forming region 15 of the first top sheet 5a is attached to the female genitalia, the absorbent sheet 1 can be softly contacted with the female genitalia.

However, if the entire absorbent sheet is soft, due to the clamping force acting from the thighs to the both side edges 1a, 1b, initially the deformation force acts on the both side edges 1a, 1b, and the deformation force tends to move toward the absorbent sheet. As a result, large twists or wrinkles may be generated in the soft central region having the furrow forming region.

However, in the absorbent sheet 1 of the present embodiment, a plurality of relatively small first crimping portions 21 and third crimping portions 23 are arranged at appropriate intervals along the row L1 which follows the shape of the side edge portions 1a and 1b. , and, as shown in FIG. 4 , a plurality of first crimping portions 21 along L1 exist independently between non-crimping regions. Therefore, when deforming force acts on the edge portion of the crotch portion of the underwear and the above-mentioned side edge portions 1a, 1b due to the clamping force from the thigh, etc., the crimping portions 21, 23 arranged along the row L1 and the Rigidity difference and thickness difference between the non-crimping parts 10a located therebetween, and due to the plurality of crimping parts 21 arranged along the row L1 and extending on both sides thereof as shown in (i), (ii) The difference in rigidity and thickness of the non-crimping area of the crimping portion 21, 23 and the non-crimping portion 10a and the above-mentioned non-crimping area produces a slight deformation, which can absorb and disperse the above-mentioned deformation pressure. Therefore, the deforming force acting on both side edges 1a, 1b is less likely to be directly transmitted to the central region of the absorbent sheet 1, and large distortion or wrinkles can be prevented from being generated in the central region by force from the side.

As described above, in order to utilize the rigidity difference and thickness difference between the crimping parts 21, 23 and the non-crimping part 10a, and the plurality of crimping parts 21 arranged along the column L1 and on both sides thereof, such as (i) The difference in rigidity and thickness of the extended non-crimping region shown in (ii) disperses the energy of the deformation force from the side. The difference in thickness of the absorbent sheet in the crimping area is preferably equal to or greater than 0.2 mm. Furthermore, the upper limit of the difference is not particularly specified, and since it is a thin absorbent sheet, the thickness of the entire absorbent sheet is preferably about 3 mm, so the preferable range of the above-mentioned difference in thickness is 0.2 to 3 mm.

In addition, on the right side fixing part 10 and the left side fixing part 11 of the above-mentioned absorbent sheet 1, the second group of crimping parts arranged along the row L2 are intermittently present in the first group arranged along the row L1. The inner side of a group of crimps. Therefore, when the deformation stress that cannot be dispersed in the first group of crimped parts acts on the column L2, the crimped parts 21 and 22 constituting the second group and the non-crimped part 10b located between the crimped parts and the The non-crimping regions extending along both sides of the crimping portion 21 of the row L2 as shown in (iii) and (iv) function in the same manner as above to disperse the deformation energy, so that the deformation force can be effectively prevented from spreading to the central region. Spread.

Furthermore, since the partitioned regions 24 surrounded by the intermittent crimping portions are arranged along the side edge portions 1a, 1b, relatively large deformation forces such as wrinkles acting on the side edge portions 1a, 1b are divided between the partitions. Area 24 is absorbed and softened.

That is, the above-mentioned divided regions 24 are mutually independent with predetermined areas, and in the divided regions 24, the back sheet 3, the intermediate sheet 4, and the top sheet 5 are in a state of overlapping without being pressed during the heat embossing process. Therefore, when a relatively large deformation force is applied to the both side edge portions 1a, 1b, in the limited divided area 24, each of the above-mentioned pieces bends and exerts elastic restoring force. The deformation force acting on the side edge portions 1a, 1b can be prevented from propagating to the central region by the bending and elastic restoring force in this limited region.

In addition, the first group of crimping parts arranged along the column L1 and the second group of crimping parts arranged along the column L2 are relatively small and arranged at intervals, preferably the width Wc of each crimping part is smaller than the width Wc of the ridge. Therefore, each crimping portion does not make the user's body feel rigid. In addition, since the small crimping parts are arranged intermittently in rows along the side edge parts 1a and 1b, and the non-crimping regions are located on both sides thereof, the crimping parts are connected to each other between the non-crimping regions. Since they exist independently, the rigidity of the absorbent sheet 1 is not too high near the side edges 1a, 1b, and the absorbent sheet 1 does not prevent the bending deformation of the absorbent sheet 1 along the crotch at the side edges 1a, 1b. Therefore, the absorbent sheet 1 is less likely to feel rigid in the crotch portion of the user.

Such an effect is more significant than forming a band-shaped crimping portion linearly extending along the row L1 or a knurled-shaped crimping portion linearly extending with a predetermined width. Articles having a linear crimping portion or a knurled crimping portion have both side edges 1a, 1b that are not easily bent, and give the user a feeling of rigidity. However, as described above, the above-mentioned embodiment The absorbent sheet 1 has the effect of distributing the energy of the clamping force acting on the side edges 1a, 1b, and does not make the user's body feel rigid.

In addition, the absorbent sheet 1 is provided with a front fixing portion 12 and a rear fixing portion 13 inside the front end edge portion 1c and the rear end edge portion 1d, and the first crimping portion 21 and the second crimping portion 22 are arranged at a certain interval. each above. Therefore, even in the vicinity of the front edge 1c and the rear edge 1d, the user's body does not feel rigid, and the folds of the underwear acting on the front edge 1c and the rear edge 1d generate force or torsional force. It is absorbed and dispersed in the same manner as above.

Hereinafter, other arrangement patterns of crimping portions will be described with reference to the following embodiments. In the following embodiments, the sheet laminate structure other than the crimping portion pattern, the groove structure, and other various ideal conditions are the same as those of the absorbent sheet 1 shown in FIG. 1 above.

In the absorbent sheet 1A according to the second embodiment of the present invention shown in FIG. 5 , the size and arrangement pattern of the crimping portions on the right side fixing portion 10 and the left side fixing portion 11 are the same as those of the absorbent sheet shown in FIG. 1 . 1 is the same. However, in FIG. 5 , the crimping portions of the front fixing portion 12 and the rear fixing portion 13 are not provided. In addition, in FIG. 5, the groove forming area 15 of the first top sheet 5a may be provided or may not be provided.

In the absorbent sheet 1A shown in FIG. 5 , the crimping portions on the front fixing portion 12 and the rear fixing portion 13 are omitted, but by forming the crimping portions of the fixing portions 10 and 11 on both sides, it is possible to absorb the scattered direction. The clamping force exerted by the side edge portions 1a, 1b of the absorbent sheet 1A can effectively prevent large wrinkles, twists, etc. from being generated in the central region of the absorbent sheet.

In the absorbent sheet 1B according to the third embodiment of the present invention shown in FIG. 6 , the right side fixing portion 110 and the left side fixing portion 111 have bilaterally symmetrical shapes with respect to the longitudinal center line Oy-Oy. Here, only the left side fixing part 111 will be described. On the left side fixing part 111, the elongated crimping parts 25 are arranged on two wavy dotted lines that alternately repeat and intersect, so that a non-crimping divided area surrounded by the elongated crimping parts 25 is formed. 26. The plurality of divided regions 26 are arranged along the left edge portion 1b, and the left edge portion 1b follows the concave curve shape of the left edge portion 1b to form the same area. In addition, one crimping portion 25 is interposed between adjacent divided regions 26 and divided regions 26 . In this embodiment, the ideal area range of the divided region 26 is the same as that of the divided region 24 shown in FIG. 1 .

In addition, at a position close to the left edge portion 1b, near each intersection of two wavy dotted lines formed by the elongated crimping portion 25, two dotted crimping portions 27 are provided. Therefore, some parts of the above-mentioned round point crimping portion 27 and the above-mentioned elongated crimping portion 25 on the line L3 connecting the crimping portion 27 constitute the same configuration as the crimping portions arranged in the column L1 of FIG. 4 . A bunch of crimps. Also, a second group of crimping parts is formed inside the first group of crimping parts arranged along L3, and the above-mentioned divided area 26 is provided between the first group of crimping parts and the second group of crimping parts.

Therefore, also in this absorbent sheet 1B, deformation stress acting on both side edge portions 1a, 1b can be dispersed and absorbed, and large wrinkles and twists can be prevented from being generated in the central region.

In addition, in the absorbent sheet 1B shown in FIG. 6 , the front fixing portion 112 is formed inside the front end edge 1c, and the rear fixing portion 113 is formed inside the rear end edge 1d. The fixing parts 112, 113 are formed by arranging the first crimping part 21 and the second crimping part 22 at intervals along the curve imitating the front end edge 1c and the rear end edge 1d, and the deformation force can be absorbed. . The dispersing function is the same as that of the absorbent sheet 1 above.

In the absorbent sheet 1C shown in FIG. 7, a right side fixing portion 210 and a left side fixing portion 211 are provided, and on each fixing portion, the crimping portions 28 are arranged on two wavy dotted lines, forming The non-crimping divided area 29 surrounded by the contact portion 28. In the right side fixing part 210 and the left side fixing part 211, the divided regions 29 having the same area are arranged along both side edge parts 1a, 1b.

Further, on the rear fixing part 213 of the front fixing part 112, crimping parts 31, 31 extending continuously are formed inside and along the inside of the front end edge 1c and the rear end edge 1d.

Similar to the above, the absorbent sheet 1C can also absorb and disperse the deforming force acting on both side edges 1a, 1b through the intermittent crimping portion 28 and the divided area 29, and make the vicinity of the both side edges 1a, 1b Becomes a softer absorbent sheet.

In the absorbent sheet 1D shown in FIG. 8 , the right side fixing portion 310 is formed inside the right edge portion 1a, and the left side fixing portion 311 is formed inside the left edge portion 1b. On both side fixing parts 310, 311, small-diameter crimping parts 35 are arranged at equal intervals along the row L4 of the concave curve shape of each side edge part 1a, 1b, forming a first group of crimping parts. . On both sides of the first group of crimping portions arranged in a row, non-crimping regions extending along the row L4 are formed, and each crimping portion 35 exists independently between the non-crimping regions.

Also, on the inner side of the first group of crimping parts, the small-diameter crimping parts 36 are arranged at equal intervals along the row L5 of the concave curve shape of each side edge part 1a, 1b, thereby forming the second group. Two groups of crimping parts. The non-crimping regions similarly extend on both sides of the crimping portion 36 , and each crimping portion 36 exists independently of each other between the non-crimping regions.

In addition, between the first group of crimping parts and the second group of crimping parts, the non-crimping regions 37, 37, which are independent of the first group and the second group of crimping parts, are formed along the circles of both side edge parts 1a, 1b. It exists in an arc-shaped extension.

In this absorbent sheet 1D, the deformation stress acting on the side edge portions 1a, 1b is also absorbed and distributed by the respective crimping portions 35 constituting the first group of crimping portions along the row L4. The individual crimps 36 of the second group of crimps of the row L5 inside L4 are further absorbed and dispersed. In particular, in this embodiment, the first group of crimping parts 35 and the second group of crimping parts 36 are both staggered by half a pitch in the longitudinal direction. Thus, there is one crimping portion 36 between adjacent crimping portions 35 and crimping portions 35 . Thus, deformation forces to be propagated across the first group of crimps to the central region can be further effectively dispersed by the second crimps.

In addition, the structure of the front fixed part 12 and the rear fixed part 13 is the same as that of the absorbent sheet 1 of embodiment shown in FIG.

In the absorbent sheet 1E shown in FIG. 9 , the right side fixing part 410 is formed inside the right edge part 1a, and the left side fixing part 411 is provided inside the left side edge part 1b. Since the right side fixing part 410 and the left side fixing part 411 are provided without forming a second group of crimping parts on the right side fixing part 10 and the left side fixing part 11 of FIG. 1 , the crimping parts 21 and 23 are arranged in one row along the row L1 to form only the first group of crimping parts, and the crimping parts 22 are regularly arranged inside the row L1. Therefore, no division area is set. And the front fixing part and the rear fixing part are not provided.

The absorbent sheet 1E can also absorb and disperse the deformation stress acting on the side edges 1a and 1b through the first group of crimping parts formed along the row L1, and its effect is not as good as that of the second group of crimping parts described in the above-mentioned embodiments. The connection is obvious.

In addition, each layer of the absorbent sheet may have the following various structures.

For example, the above-mentioned top sheet 5 may also have a single-layer structure and have liquid absorbency. However, the top sheet 5 needs to contain thermoplastic fibers in order to smoothen the bottom surface of the crimping portion by heat embossing and form it into a film surface. For example, as hydrophilic fibers, 55% by mass of rayon fibers with a fiber degree of 1.38dtex and a fiber length of 44mm, 30% by mass of polyester fibers with a fiber degree of 1.43dtex and a fiber length of 38mm, 15% by mass The fiber degree of % is 1.65dtex, the polypropylene fiber that fiber length is 45mm, and this weight per unit area can be 38g/ ^m The spunlace non-woven fabric of about 38g/m can be used as above-mentioned top sheet 5. In addition, as mentioned above, if not limited to forming the bottom of the crimping portion into a film surface, the top sheet 5 may be composed mainly of cellulose fibers such as cotton, rayon, and pulp, or may only be composed of cellulose fibers.

In this case, the intermediate sheet 4 may be an air-laid nonwoven fabric with a weight per unit area of about 25 g/m ^{2 ,} which is composed of core-sheath composite synthetic fibers whose core is polyester and the sheath is polyethylene. Rather than absorbing liquid, the intermediate sheet 4 functions as a cushioning layer to reduce contact pressure against the user's skin.

In addition, the above-mentioned backsheet 3, middle sheet 4, and topsheet 5 may be formed of a hydrolyzable material or a biodegradable material. In this way, the used absorbent sheet can be disposed of in the flush toilet.

In this case, the backsheet 3 may be a spunlaced nonwoven fabric composed of fibers such as rayon fibers, cotton fibers, and biodegradable resin fibers with a fiber length of 1 to 10 mm and a water-soluble binder such as PVA resin. cloth or paper. Alternatively, polylactic acid, polybutyl succinate (polybutyl succinate), polyhydroxybutyrate, etc., after coating with PVA, hydrodecomposable ester urethane, etc., on the above-mentioned non-woven fabric or paper can be used. (Polyhidrokishibuchileto) and other biodegradable resin films.

In addition, the intermediate sheet 4 can be made of fibers such as rayon fibers, cotton fibers, and biodegradable resin fibers with a fiber length of 1 to 10 mm. If necessary, a jet spray such as polyvinyl alcohol (PVA) resin is added as a binder Non-woven fabric or paper, air-laid non-woven fabric that is chemically bonded using a small amount of water-soluble material such as acrylate or PVA as the adhesive.

In addition, the top sheet 5 can also be comprised with the said hydrolyzable spunlace nonwoven fabric. Alternatively, the above-mentioned water-soluble resin film may be used for the top sheet 5 by forming many liquid permeable holes.

In addition, the length on the longitudinal center line Oy-Oy of the absorbent sheet is 60 to 140 mm, and the width on the transverse center line Ox-Ox is about 45 to 65 mm.

Although the embodiments of the present invention have been shown and described, the above-mentioned and other various changes, omissions, and additions can be configured without departing from the spirit and scope of the present invention, and those in the art can understand it. Therefore, it should not be understood that the present invention is limited to the specific embodiments described herein, but encompasses various possible embodiments that can be embodied within a range of equality including the features of the appended claims.

As described above, the absorbent article of the present invention does not impair the overall softness, can prevent large wrinkles or twisting in the central region, can always ensure a large surface area for receiving liquid, and has a good effect on the excretory organs of the user. Good fit. In addition, since the whole body is soft, the side edges give less rigidity to the user's body. Therefore, this absorbent article is suitably used as a thin absorbent article such as a sheet for leucorrhea absorption.

Claims (12)

1. An absorbent article consisting of a plurality of overlapping sheets, having side edges (1a, 1b) extending longitudinally and end edges (1c, 1d) opposite to the longitudinal direction, formed lengthwise, and characterized in that, Within the range of a predetermined length (La) extending longitudinally across the transverse centerline (Ox-Ox) of the article, a first group of a plurality of crimping portions are arranged on the inside of each of the above-mentioned side edge portions (1a, 1b), The first group of crimping portions are arranged in a row following the shapes of the side edge portions (1a, 1b) at appropriate intervals, and have non-crimping regions on both sides of the row. 2. The absorbent article according to claim 1, wherein the distance between adjacent crimped portions in the row is 0.5 to 5 mm, and the bottom surface area of the crimped portions is 0.25 to 6 mm ² . 3. The absorbent article according to claim 1, wherein at least some of the crimping portions of the first group have round, elliptical, or polygonal bottom surfaces and are arranged at regular intervals along the row. 4. The absorbent article according to claim 1, wherein each of the side edge portions (1a, 1b) has a concave curve shape, and the row formed by the crimping portions of the first group is also a concave curve shape. 5. The absorbent article according to claim 1, wherein the plurality of crimping portions of the second group are arranged inside the first group of crimping portions, and the first group of crimping portions and the second group of crimping portions There is a non-crimp area between the contacts. 6 . The absorbent article according to claim 5 , wherein the area of the bottom surface of the second group of crimping portions is 0.25 to 6 mm ² . 7. An absorbent article consisting of a plurality of overlapping sheets, having side edges (1a, 1b) extending longitudinally and end edges (1c, 1d) opposite to the longitudinal direction, formed lengthwise, and characterized in that, On the inside of each of the side edge portions (1a, 1b), there are respectively provided non-crimping demarcation areas of a predetermined area surrounded by a plurality of crimping parts, which cross the transverse centerline (Ox-Ox) of the article, and A plurality of the divided regions are arranged along the respective side edge portions (1a, 1b) within a predetermined length (La) extending in the longitudinal direction. 8. The absorbent article according to claim 7, wherein the plurality of divided regions arranged along the respective side edges (1a, 1b) have the same shape and the same area. 9. The absorbent article according to claim 7, wherein at least some of the plurality of crimping portions surrounding the divided area have a circular, elliptical, or polygonal bottom surface. 10. The absorbent article according to claim 7, wherein the bottom surface area of the crimping portion is 0.25 to 6 mm ² . 11. The absorbent article according to claim 1 or 7, characterized in that the crimping portion positioned inside one side edge portion (1a) and the crimping portion positioned inside the other side edge portion (1b) The minimum lateral dimension (We) of the sandwiched non-crimping region is 20 mm or more. 12. The absorbent article according to claim 1 or 7, characterized in that the crimping portion positioned inside one side edge portion (1a) and the crimping portion positioned inside the other side edge portion (1b) On the clamped non-crimping area, the sheet exposed on the outermost surface of the article is formed, and the ridges (15a) and the grooves (15b) extend longitudinally and alternately in the transverse direction.

Images