CN111587101B

CN111587101B - Pants-type absorbent article

Info

Publication number: CN111587101B
Application number: CN201880084062.1A
Authority: CN
Inventors: 笹山贤一; 大西和彰; 村上圭; 永山唯; 近藤大贵
Original assignee: Unicharm Corp
Current assignee: Unicharm Corp
Priority date: 2017-12-28
Filing date: 2018-11-29
Publication date: 2022-03-11
Anticipated expiration: 2038-11-29
Also published as: WO2019130971A1; JP2019118556A; CN111587101A; TW201936144A; JP6503448B1; TWI756491B

Abstract

A pants-type absorbent article (1) is provided with: an absorbent main body (10) which includes an absorbent core (11) and is folded back and forth at a lower end portion; and a front side belt portion (23) having a front side stretchable region (23s) stretchable in the left-right direction, the absorbent core (11) including a front side portion (10F) which is a portion folded to the front side in the front-back direction, the absorbent core (11) including a pair of inclined low basis weight regions (31) in the front side portion (10F), the pair of inclined low basis weight regions being inclined from top to bottom in the up-down direction and inclined from the outside toward the center in the left-right direction, and the basis weight being lower than the basis weight of the peripheral region. The pair of inclined low basis weight regions entirely overlaps the front-side stretchable region.

Description

Pants-type absorbent article

Technical Field

The present invention relates to a pants-type absorbent article.

Background

A pants-type absorbent article has an absorbent core for absorbing excretory fluid such as urine. A technique is known in which slits or the like are provided in a partial region of an absorbent core to reduce rigidity, so that the absorbent core is easily bent at the low rigidity portion to be easily deformed three-dimensionally along the body of the wearer when a pants-type absorbent article is worn. For example, patent document 1 discloses an absorbent article including an opening portion 63, the opening portion 63 being bent inward and being provided offset to the front abdominal portion in the longitudinal direction of the absorbent core.

List of citations

Patent document

Patent document 1: japanese laid-open patent publication No. 2007-202575

Disclosure of Invention

[ problem ] to

According to the absorbent article in patent document 1, since slits or the like are provided in the absorbent core, the absorbent core can be easily deformed three-dimensionally along the body shape of the wearer. However, with this absorbent article, sufficient fit may not be obtained. For example, if the absorbent core is deformed to protrude toward the skin side of the wearer, there is a large range of portions of the absorbent core that rise or fall relative to the body of the wearer to form a gap between the absorbent core and the skin of the wearer, thus resulting in poor fit. In particular, when the wearer moves his or her legs (e.g., walks), the region of the absorbent core from the abdomen side to the crotch portion is largely deformed, and thus the fit in this region is liable to deteriorate.

The present invention has been made in view of the conventional problems such as the above-described problem, and an object of the present invention is to provide a pants-type absorbent article that achieves an improvement in fit on the abdomen side of an absorbent core.

[ means for solving problems ]

A main aspect of the present invention for achieving the above object is a pant-type absorbent article having a vertical direction, a horizontal direction, and a front-rear direction intersecting each other, the pant-type absorbent article comprising: an absorbent body which is folded back and forth at a lower end portion in the vertical direction and includes an absorbent core arranged in the vertical direction; and a front side belt portion joined to a front upper end portion of the absorbent main body and including a front side stretchable region that stretches and contracts in the left-right direction, the absorbent core including a front side portion that is a portion folded toward the front side in the front-back direction, the absorbent core including a pair of inclined low basis weight regions in the front side portion, the pair of inclined low basis weight regions being inclined from an upper side toward a lower side in the up-down direction and from an outer side in the left-right direction toward a center side, a basis weight of the pair of inclined low basis weight regions being lower than a basis weight of a surrounding region, the pair of inclined low basis weight regions entirely overlapping the front side stretchable region.

Features of the present invention other than those described above will become apparent by reading the description of the present specification with reference to the accompanying drawings.

[ advantageous effects of the invention ]

According to the present invention, a pants-type absorbent article that achieves an improvement in fit on the abdomen side of the absorbent core can be provided.

Drawings

Fig. 1 is a perspective view of a pants-type disposable diaper 1.

Fig. 2 is a schematic plan view of the diaper 1 in an unfolded and stretched state, as viewed from the non-skin side.

Fig. 3 is a schematic sectional view taken along line I-I in fig. 2.

Fig. 4A is a schematic plan view of the absorbent main body 10 in an unfolded and stretched state as viewed from the skin side. Fig. 4B is a sectional view taken along line a-a in fig. 4A.

Fig. 5 is a schematic plan view of the diaper 1 in an unfolded and stretched state, and shows the positional relationship between the respective stretchable regions (21s, 22s, 23s) and the absorbent core 11.

Fig. 6 is a plan view of the absorbent core 11 viewed from the skin side.

Fig. 7 is a schematic perspective view showing deformation of the absorbent core 11 when the diaper 1 is worn.

Fig. 8 is a schematic sectional view of a state where the absorbent core 11 is lifted from the body (skin) of the wearer.

Fig. 9 is a schematic cross-sectional view of a case where the front side stretchable zone 21s applies a contraction force in the left-right direction to the absorbent core 11 in fig. 8.

Detailed Description

At least the following will become apparent from the accompanying drawings and the description of the present specification.

A pant-type absorbent article having a vertical direction, a horizontal direction, and a front-rear direction intersecting each other, comprising: an absorbent body which is folded back and forth at a lower end portion in the vertical direction and includes an absorbent core arranged in the vertical direction; and a front side belt portion joined to a front upper end portion of the absorbent main body and including a front side stretchable region that stretches and contracts in the left-right direction, the absorbent core including a front side portion that is a portion folded toward the front side in the front-back direction, the absorbent core including a pair of inclined low basis weight regions in the front side portion, the pair of inclined low basis weight regions being inclined from an upper side toward a lower side in the up-down direction and from an outer side in the left-right direction toward a center side, a basis weight of the pair of inclined low basis weight regions being lower than a basis weight of a surrounding region, the pair of inclined low basis weight regions entirely overlapping the front side stretchable region.

According to this pants-type absorbent article, the absorbent core is easily deformed freely with the movement of the legs of the wearer due to the pair of inclined low basis weight regions arranged obliquely from the pubic periphery of the wearer along the crotch portion thereof. Further, since the stretching force in the right-left direction is applied from the non-skin side of the absorbent core, the absorbent core is closely attached to the lower abdomen of the wearer when the diaper is worn. This thus improves the fit of the absorbent body near the pubic bone of the wearer.

In such a pants-type absorbent article, it is desirable that a central low basis weight region penetrating the absorbent core in the up-down direction is provided in the front side portion at a position between the pair of inclined low basis weight regions in the left-right direction.

According to this pants-type absorbent article, when the absorbent core is sandwiched between the legs of the wearer in the crotch of the wearer, the absorbent core easily undergoes bending deformation so as to protrude toward the skin side in the up-down direction starting from the central low-basis-weight region where the rigidity is lowest. Thus, the absorbent core is easily fitted along the wearer's excretory source.

In such a pants-type absorbent article, it is desirable that the width of the central low basis weight region in the short-side direction is larger than the width of each of the pair of oblique low basis weight regions in the short-side direction.

According to the pants-type absorbent article, the central low basis weight region has a lower rigidity than the inclined low basis weight region, and can more easily undergo bending deformation. Therefore, when the absorbent core is sandwiched at the crotch of the wearer, the region corresponding to the central low basis weight region is first bent, and then the inclined low basis weight region becomes the starting point of the bending deformation. Therefore, the absorbent core is easily naturally deformed along the shape of the wearer's body.

In such a pants-type absorbent article, it is desirable that the positions of the lower ends of the pair of inclined low basis weight regions be higher than the position of the lower end of the central low basis weight region in the up-down direction.

According to the pants-type absorbent article, the central low basis weight region extends to a height near the crotch of the wearer, and therefore, the central low basis weight region easily functions as a fold guide region for convexly deforming the absorbent core. On the other hand, the pair of inclined low basis weight regions extend to a height at the pubic region of the wearer, and thus the absorbent core is likely to be freely deformed as the legs of the wearer move.

In such a pants-type absorbent article, it is desirable that the upper ends of the pair of inclined low basis weight regions are located higher than the upper end of the central low basis weight region in the up-down direction.

According to the pants-type absorbent article, the position of the central low-basis-weight region is not so high, and the absorbent core can be suppressed from being convexly deformed in a region having a flat shape of the abdomen of the wearer. On the other hand, the inclined low basis weight regions are provided at a higher position than the central low basis weight region, and therefore, the upper portion of the absorbent core can easily undergo bending deformation with the movement of the legs of the wearer.

In such a pants-type absorbent article, it is desirable that the pants-type absorbent article further comprises: a rear side belt portion joined to a rear upper end portion of the absorbent main body and including a rear side stretchable region stretchable in the left-right direction; and an end portion joining region that joins both end portions in the left-right direction of the front side band portion to both end portions in the left-right direction of the rear side band portion, a lower end edge of the front side band portion including an inclined portion that is inclined obliquely downward from a lower end of the end portion joining region toward the crotch portion.

According to the pants-type absorbent article, when the front side belt portion and the rear side belt portion are pulled outward in the left-right direction when the diaper is put on, the inclined portion is also pulled outward in the left-right direction. This makes it easier for the absorbent main body to be pulled obliquely upward via the inclined portion. Therefore, the absorbent body is less likely to be displaced from the periphery of the pubis of the wearer, and fit is improved.

In such a pants-type absorbent article, it is desirable that a smaller angle of angles formed by the inclined portions and the up-down direction is larger than a smaller angle of angles formed by the inclined low basis weight regions and the up-down direction.

According to this pants-type absorbent article, the absorbent main body is easily pulled in the left-right direction, and therefore, the absorbent core easily exhibits stretchability in the left-right direction after undergoing bending deformation along the inclined low basis weight region. Thus, the absorbent core is likely to be in close contact with the wearer's skin, and the fit is improved.

In such a pants-type absorbent article, it is desirable to further include leg-surrounding elastic members which stretch along the inclined portions, regions of the leg-surrounding elastic members exhibiting stretchability not overlapping with the absorbent core.

According to this pants-type absorbent article, when the absorbent main body is pulled obliquely upward, an excessive force is less likely to be applied to the absorbent core itself, and the bending deformation of the absorbent core is less likely to be impaired.

In such a pants-type absorbent article, it is desirable that the absorbent core includes a narrowed portion in which the width in the left-right direction is reduced in the front side portion, and a portion in which the width in the left-right direction is smallest in the narrowed portion overlaps with the front side stretchable region.

According to the pants-type absorbent article, in the narrowed portion of the absorbent core, the stretchability in the left-right direction of the front side stretchable region is applied to the portion having the smallest width in the left-right direction and being most easily deformed, so that the deformed absorbent core is more likely to be in close contact with the skin side of the wearer. Therefore, the absorbent core can be appropriately deformed along the shape of the wearer's body, and the fit can also be improved.

In such a pants-type absorbent article, it is desirable that a central low basis weight region that penetrates the absorbent core in the up-down direction is provided in the front side portion at a position between the left-right direction of the pair of inclined low basis weight regions, and a position of a portion of the narrow portion where the width in the left-right direction is smallest is higher than a position of a lower end of the central low basis weight region in the up-down direction.

According to this pants-type absorbent article, in the narrow portion of the absorbent core, in the portion having the smallest width in the left-right direction and most easily deformed, the force for causing the convex deformation of the absorbent core in the up-down direction is less likely to interfere with the force for raising the absorbent core from the crotch portion to the lower abdomen along the body shape of the wearer. Therefore, the absorbent core is easily deformed appropriately.

In such a pant-type absorbent article, it is desirable that the pair of inclined low basis weight regions include a pair of first inclined low basis weight regions and a pair of second inclined low basis weight regions provided in regions inward of the pair of first inclined low basis weight regions in the left-right direction.

According to this pant-type absorbent article, the pair of first inclined low basis weight regions and the pair of second inclined low basis weight regions are provided, and therefore the number of bending starting points when the absorbent core undergoes deformation increases. This enables the absorbent core to be more smoothly deformed.

In such a pant-type absorbent article, it is desirable that the length in the longitudinal direction of the pair of second inclined low basis weight regions is smaller than the length in the longitudinal direction of the pair of first inclined low basis weight regions.

According to this pants-type absorbent article, the absorbent core undergoes a smaller bending deformation in the second inclined low basis weight region disposed at the inner position in the left-right direction, and the absorbent core undergoes a larger bending deformation in the first inclined low basis weight region disposed at the outer position in the left-right direction. Therefore, the absorbent core is likely to be bent largely in the outer region in the left-right direction near the legs of the wearer, and can easily follow the leg movement.

In such a pants-type absorbent article, it is desirable that the positions of the lower ends of the pair of second inclined low basis weight regions be higher than the positions of the lower ends of the pair of first inclined low basis weight regions in the up-down direction.

According to this pants-type absorbent article, the inclined low basis weight region on the outer side in the left-right direction is formed to extend to the lowest position possible in the up-down direction, and therefore the absorbent core also more easily undergoes bending deformation in the region near the crotch of the wearer, and more easily follows the movement of the legs.

In such a pants-type absorbent article, it is desirable that the absorbent core includes, at the front side portion: a first upper low basis weight region extending in the up-down direction and having a basis weight lower than that of the surrounding region; and a first lower low basis weight region extending in the up-down direction and having a basis weight lower than that of the surrounding region, a lower end of the first upper low basis weight region being connected to an upper end of the first inclined low basis weight region, and a lower end of the first inclined low basis weight region being connected to an upper end of the first lower low basis weight region.

According to the pants-type absorbent article, the influence of distortion, stress, or the like generated when the absorbent core is deformed in the inclined low basis weight region can be dispersed to the upper low basis weight region and the lower low basis weight region. Therefore, the absorbent core can be deformed more naturally in these regions.

In such a pants-type absorbent article, it is desirable that the absorbent core includes a second upper-side low-basis-weight region extending in the up-down direction and having a basis weight lower than that of the surrounding region at the front side portion, and a lower end of the second upper-side low-basis-weight region is connected to an upper end of the second inclined low-basis-weight region.

According to the pants-type absorbent article, the influence of the distortion, stress, or the like generated when the absorbent core is deformed in the second inclined low basis weight region can be dispersed to the second upper low basis weight region. Therefore, the absorbent core can be deformed more naturally in these regions.

Detailed description of the preferred embodiments

Hereinafter, an embodiment of a pants-type absorbent article of the present invention will be described by taking, as an example, a pants-type disposable diaper 1 for adults (hereinafter also referred to as "diaper 1"). Note that the pants-type absorbent article of the present invention can also be used as, for example, a disposable diaper for children, a sanitary product (pants-type sanitary napkin), or the like.

Integrated structure of diaper 1

Fig. 1 is a schematic perspective view of a diaper 1. Fig. 2 is a schematic plan view of the diaper 1 in an unfolded and stretched state, as viewed from the non-skin side. Fig. 3 is a schematic sectional view taken along line I-I in fig. 2. Note that the "stretched state" of the diaper 1 refers to a state in which: the diaper 1 is stretched so as to eliminate wrinkles, and is stretched so that the dimensions of each member (for example, an exterior member 20 described later) constituting the diaper 1 match or are close to the dimensions of the member alone.

The diaper 1 has a vertical direction, a horizontal direction, and a front-rear direction intersecting each other, and, as shown in fig. 3, has a thickness direction in which the respective members are laminated. In the up-down direction, the side corresponding to the torso of the wearer is the upper side, and the side corresponding to the crotch of the wearer is the lower side. In the front-rear direction, the side corresponding to the abdomen of the wearer is the front side, and the side corresponding to the back of the wearer is the rear side. In the thickness direction, the side in contact with the wearer's body is the skin side, and the opposite side is the non-skin side. Also, in the developed state in fig. 2, the diaper 1 has a longitudinal direction and a width direction intersecting each other. The longitudinal direction corresponds to the up-down direction, and the width direction is the same as the left-right direction.

The diaper 1 comprises: an absorbent main body 10 that is rectangular in a plan view; and an exterior member 20 located on the non-skin side of the absorbent body 10. The exterior member 20 includes: an abdomen-side exterior member 21 (front-side belt portion 21) located on the front side in the front-rear direction; a back-side exterior member 22 (back-side belt portion 22) located on the back side in the front-back direction; and a crotch exterior member 23 (crotch member 23) connecting the abdomen-side exterior member 21 and the back-side exterior member 22. The above members adjacent in the thickness direction are joined together with an adhesive or the like.

In addition, the front side belt portion 21 is located at one end side in the longitudinal direction of the absorbent main body 10, and the rear side belt portion 22 is located at the other end side in the longitudinal direction of the absorbent main body 10. In the longitudinal direction of the absorbent main body 10, the front side is the side where the front side belt portion 21 is located, and the rear side is the side where the rear side belt portion 22 is located. In other words, the front side belt portion 21 is located in the front upper end portion of the absorbent main body 10, and the rear side belt portion 22 is located in the rear upper end portion of the absorbent main body 10. The crotch member 23 is located closer to the skin than the front side belt portion 21 and the rear side belt portion 22.

Note that although in the diaper 1 of the present embodiment, the exterior member 20 is constituted by three members, it is not limited thereto. For example, the front side belt portion 21, the back side belt portion 22 and the crotch member 23 may be a single member. It is also possible to have a configuration that does not include the crotch member 23, and it is possible to have a configuration that: a member different from the exterior member 20 is further laminated on the non-skin side with respect to the exterior member 20.

When the diaper 1 is in the developed state shown in fig. 2, the absorbent main body 2 is folded in half at a predetermined position CL in the longitudinal direction, and both side portions in the left-right direction of the front side belt portion 21 are joined to both side portions in the left-right direction of the rear side belt portion 22 by adhesion or the like, thereby obtaining a pants type shown in fig. 1. In other words, the longitudinal direction of the absorbent main body 10 coincides with the vertical direction of the diaper 1, and the front side belt portions 21 and the rear side belt portions 22 are connected in a loop shape, thereby forming the waist-opening 1a and the pair of leg-openings 1 b. Hereinafter, a region where the front side band portion 21 and the back side band portion 22 are joined to each other is referred to as an end joining region 24.

In addition, in the present specification, in the case where the absorbent main body 10 (absorbent core 11) is folded at the predetermined position CL, a portion folded forward thereof is referred to as a "front side portion 10F", and a portion folded backward is referred to as a "rear side portion 10R". In other words, with respect to the longitudinal direction in fig. 2, the region of the absorbent main body 10 (absorbent core 11) in front of the predetermined position CL is sometimes referred to as "front side portion 10F", and the region behind the predetermined position CL is sometimes referred to as "back side portion 10R".

As shown in fig. 3, the absorbent main body 10 includes: an absorbent core 11; a topsheet 12 positioned on the skin side of the absorbent core 11; and a backsheet 13 positioned on the non-skin side of the absorbent core 11. Fig. 4A is a schematic plan view of the absorbent main body 10 in an unfolded and stretched state as viewed from the skin side. Fig. 4B is a sectional view taken along line a-a in fig. 4A. Note that, for the sake of simplifying the description, fig. 4B does not show a low basis weight region (described later) provided in the absorbent core 11.

The absorbent core 11 is a member that absorbs and retains discharged liquid such as urine, and is formed of, for example, liquid-absorbing fibers such as pulp fibers mixed with Super Absorbent Polymer (SAP). The absorbent core 11 of the present embodiment has a narrowed portion 11c having a narrow width in the left-right direction between the front side end and the rear side end in the longitudinal direction, and has a substantially hourglass shape in a plan view as shown in fig. 4A. The absorbent core 11 is also provided with various types of low basis weight regions, which are regions having a lower basis weight than the surrounding regions. The low basis weight region will be described in detail later. The outer peripheral surface of the absorbent core 11 may be covered with a liquid-permeable sheet made of interleaving paper, nonwoven fabric, or the like.

The top sheet 12 is a liquid-permeable sheet, and is made of, for example, a hydrophilic air-permeable nonwoven fabric, a spunbond nonwoven fabric, or the like. The backsheet 13 has a two-layer structure including a liquid-impermeable sheet 13a and a hydrophobic sheet 13b disposed on the non-skin side of the liquid-impermeable sheet 13 a. The liquid-impermeable sheet 13a is made of, for example, a resin film, and the hydrophobic sheet 13b is made of, for example, a soft hydrophobic nonwoven fabric. Note that the backsheet 13 may have a single-layer structure composed of a liquid-impermeable sheet 13 a.

Side sheets 14 are provided on both sides of the chassis 13 in the left-right direction. The side sheet 14 extends outward in the left-right direction beyond both ends 11es and 11es in the left-right direction of the absorbent core 11. Then, the left and right ends 10es and 10es of the absorbent main body 10 are folded back to the left and right inner sides and the skin side in the thickness direction as folded positions, thereby forming a pair of leakage preventing wall portions 40. The leakage preventing wall portions 40 are fixed with leakage preventing wall

elastic members

41, 42 such as elastic strings in a state stretched in the longitudinal direction (vertical direction) of the absorbent main body 10. When the leakage preventing wall

elastic members

41, 42 contract in the longitudinal direction, the pair of leakage preventing wall portions 40 rise toward the skin side at both ends in the left-right direction of the absorbent main body 10, and function as leakage preventing walls (leg side gathers) of the diaper 1. Note that: the side sheet 14 is not provided, and the back sheet 13 (liquid-permeable sheet 13b) is extended to the outside in the left-right direction of the absorbent core 11, thereby forming the leakage preventing wall 40.

As shown in fig. 2, the front side belt portion 21 and the rear side belt portion 22 respectively include in the up-down direction:

waist regions

211 and 221 in which the end joining regions 24 are located; and

crotch regions

212 and 222 located below the

waist regions

211 and 221. The

waist regions

211 and 221 are rectangular in plan view. The

crotch region

212 and 222 is substantially trapezoidal, and the outer edge portions thereof have inclined

portions

212s and 222s that are inclined toward the lower side in the up-down direction and toward the inner side in the left-right direction. In other words, the width in the left-right direction of the

crotch regions

212 and 222 becomes narrower toward the lower side. In the present embodiment, the crotch region 222 of the back side belt portion 22 is larger than the crotch region 212 of the front side belt portion 21, and can cover a wide range of the hip region of the wearer.

As shown in fig. 3, the front side band portion 21 and the back side band portion 22 respectively include:

skin side sheets

213 and 223 on the skin side;

non-skin side panels

214 and 224 on the non-skin side; and stretchable

nonwoven fabrics

215 and 225 which are positioned between the sheets and have stretchability at least in the lateral direction of the diaper 1.

The

skin side sheets

213 and 223 and the

non-skin side sheets

214 and 224 are preferably flexible sheets, and are made of, for example, spunbond nonwoven fabric, SMS nonwoven fabric, or the like.

The stretch

nonwoven fabrics

215 and 225 include, for example, polypropylene (PP) of a polyurethane elastomer made of thermoplastic elastomer fibers having elasticity and a polyolefin resin having no thermoplastic resin fibers having elasticity. Also, the stretchable

nonwoven fabrics

215 and 225 are nonwoven fabrics that have been subjected to appropriate stretching treatment such as gear stretching. According to this stretching treatment, the stretchable

nonwoven fabrics

215 and 225 have stretchability in a predetermined direction. Note that the stretching process may be a stretching process performed in mutually orthogonal directions, or may be a stretching process performed only in a predetermined direction. In the case where the stretching treatment is performed only in the predetermined direction, the stretchability is exhibited in the predetermined direction, but not necessarily all the fibers are oriented in the predetermined direction, and thus the stretchability is also exhibited in a direction orthogonal to the predetermined direction.

The

skin side sheets

213 and 223, the

non-skin side sheets

214 and 224, and the stretchable

nonwoven fabrics

215 and 225 are joined by the scattered multiple welded

portions

25a and 25b (e.g., the ultrasonically welded regions), and therefore the skin feel is soft compared to the case of joining using, for example, a hardened adhesive. In addition, the stretchable

nonwoven fabrics

215, 225 are contracted between the welded

portions

25a and 25b, and therefore, the

skin side sheets

213 and 223 and the

non-skin side sheets

214 and 224 are bent in the thickness direction and protrude outward. In other words, the

skin side sheets

213 and 223 and the

non-skin side sheets

214 and 224 are projected between the welded

portions

25a and 25b, so that the skin feels softer to the touch and can give the user a visually soft feeling.

According to this structure, the front side belt portion 21 and the rear side belt portion 22 as a whole have stretchability in the lateral direction (and the vertical direction) of the diaper 1. A region of the front side belt portion 21 exhibiting stretchability in the left-right direction is taken as a front side stretchable region 21s, and a region of the rear side belt portion 22 exhibiting stretchability in the left-right direction is taken as a rear side stretchable region 22s (see a hatched portion in fig. 5). Also, as shown in fig. 2, the

fusion portions

25a and 25b are scattered with a relatively small interval therebetween. Therefore, in the diaper 1 of the present embodiment, there are formed extremely fine projections (wrinkles) extending in a plurality of directions, and it is possible to prevent the formation of wrinkles (vertical wrinkles and the like) in one direction specific to the diaper, thereby providing the diaper 1 with a good appearance.

Note that a stretchable film may be used instead of the stretchable

nonwoven fabrics

215 and 225. It should be noted that since the stretchable film has a substantially uniform thickness, the projections of the

skin side sheets

213 and 223 and the

non-skin side sheets

214 and 224 between the

welds

25a and 25b are easily collapsed. In contrast, the stretchable

nonwoven fabrics

215 and 225 increase the thickness between the

welds

25a and 25b, thereby suppressing the convex collapse of the

skin side sheets

213 and 223 and the

non-skin side sheets

214 and 224, so that the soft skin feel and good appearance of the diaper can be maintained.

In addition, in the regions where the welded

portions

25a and 25b are scattered, with respect to the first scattered region X and the remaining second scattered region Y overlapping with the absorbent main body 10 in the thickness direction, the welded

portions

25a and 25b may have different shapes and/or different proportions of the welded

portions

25a and 25b per unit area between the first scattered region X and the second scattered region Y. Note that, in the first scattering area X in fig. 2, substantially rectangular fusion-spliced portions 25a inclined at an angle of 45 degrees or-45 degrees with respect to the left-right direction are alternately arranged. On the other hand, in the second scattering area Y, the circular welding portions 25b are provided in a staggered arrangement.

In the second scattering area Y, the area occupied by the welded portion 25b per unit area is smaller than that in the first scattering area X. Therefore, in the

waist regions

211 and 221 where problems such as perspiration and moisture are likely to occur, it is possible to suppress a decrease in air permeability caused by the welded portions 25b and maintain appropriate air permeability. On the other hand, in the first scattering area X overlapping the absorbent main body 10, the contraction of the front side belt portion 21 and the rear side belt portion 22 is appropriately suppressed, thereby making it possible to reduce the contraction in the left-right direction of the absorbent main body 10.

In addition, a plurality of elastic cord-like elastic members 26 are arranged in regions of the front side belt portion 21 and the rear side belt portion 22 extending along the waist-opening 1 a. Similarly, a plurality of leg-surrounding elastic members 27 of elastic string or the like are arranged in the region extending along the leg-surrounding opening 1 b. In other words, due to the waist elastic members 26 and the leg elastic members 27, the waist and leg circumferences of the diaper 1 are firmly fitted to the body of the wearer, thereby making it possible to prevent the falling off of the diaper 1 and the leakage from the leg circumferences. In other regions, the diaper 1 fits widely and gently on the wearer's body due to the stretch

nonwoven fabrics

215 and 225, thereby reducing the feeling of tightness.

The crotch member 23 has a substantially hourglass shape in plan view, and is bent inward in the left-right direction at the center in the longitudinal direction. Also, as shown in fig. 3, the stopper member 23 includes: a skin side sheet 231 on the skin side; a non-skin side panel 232 on the non-skin side; and a stretchable nonwoven fabric 233 which is located between the sheets and has stretchability in the vertical direction of the diaper 1 (the longitudinal direction of the absorbent main body 10). These sheets 231 to 233 are joined by means of a plurality of welds (for example, the same welds 25b as those in the second scattering area Y). In the crotch member 23, a region exhibiting stretchability in the up-down direction is taken as a crotch stretch region 23s (see a hatched portion in fig. 5).

By providing this crotch stretch region 23s, the absorbent core 11 can be brought into close contact with the crotch of the wearer, and sagging of the diaper 1 can be suppressed even if the weight of the absorbent core 11 increases due to excrement. In addition, a plurality of crotch elastic members 28 are arranged in the area of the crotch member 23 extending along the leg-surrounding openings 1b, and the crotch member 23 is in close contact with the leg-surrounding of the wearer.

About deformation of the absorbent core 11

How the absorbent core 11 (absorbent main body 10) deforms with the movement of the wearer's body when the diaper 1 is worn is described below.

Fig. 5 is a schematic plan view of the diaper 1 in an unfolded and stretched state, and shows the positional relationship between the respective stretchable regions (21s, 22s, 23s) and the absorbent core 11. Fig. 6 is a plan view of the absorbent core 11 viewed from the skin side.

As shown in fig. 5, the absorbent core 11 has: a "lower abdominal region 11A" which is located in the lower abdomen of the wearer when worn; a "crotch portion 11B" which is located in the crotch of the wearer; and a "hip region 11C" which is located at the hip of the wearer. In fig. 5, the portion overlapping the front side belt portion 21 is the lower abdomen portion 11A, the portion overlapping the rear side belt portion 22 is the hip portion 11C, and the portion therebetween is the crotch portion 11B. In other words, the lower abdomen portion 11A is a portion located in the front side portion 10F of the diaper 1, and the hip portion 11C is a portion located in the back side portion 10R of the diaper 1. The crotch portion 11B is a portion located at the lower end portion in the vertical direction of the pants-shaped diaper 1, and extends from the front side portion 10F to the rear side portion 10R across a predetermined position CL.

Note that the range of the "crotch portion 11B" shown in fig. 5 is an example, and is not limited thereto. For example, the crotch part may be a central region that is one third of a region extending from the lower end of the end joining region 24 of the front side belt part 21 to the lower end of the end joining region 24 of the rear side belt part 22 with respect to the longitudinal direction.

The absorbent core 11 has an "inclined low basis weight region 31" at a position above the lower end of the diaper 1 in the up-down direction (a position corresponding to the predetermined position CL) and on the front side (the front side portion 10F) in the front-back direction, the inclined low basis weight region 31 being a region in which the basis weight of the absorbent core 11 is lower than the surrounding regions. The slanted low basis weight region 31 includes: first sloped low basis weight regions 311; and a second inclined low basis weight region 312 disposed inward in the left-right direction with respect to the first inclined low basis weight region 311. Each of the inclined low

basis weight regions

311 and 312 is a region inclined from the top to the bottom in the up-down direction and from the outer side toward the center side in the left-right direction, and the inclined low

basis weight regions

311 and 312 are provided in a pair on the left and right on the front side of the absorbent core 11. Further, in the diaper 1, the first inclined low basis weight regions 311 and the second inclined low basis weight regions 312 are arranged in parallel with each other.

Note that the "basis weight" of the absorbent core 11 is the mass (g/m) of the absorbent core 11 (e.g., liquid absorbent fibers mixed with SAP) per unit area²). Can useThe known method compares the basis weight of the absorbent core 11 in the inclined low basis weight region 31 and the surrounding region. For example, there is a visual comparison method. In another method, a target portion is cut out from the absorbent core 11 as a sample, the mass and area of each sample are measured, and the mass per unit area is calculated and compared. The same applies to the other low basis weight regions described below.

Due to the difference in rigidity between the inclined low basis weight region 31 and the surrounding region, the absorbent core 11 is easily bent starting from the inclined low basis weight region 31. Therefore, when the diaper 1 is worn, the absorbent core 11 is easily deformed along the uneven shape of the wearer's body by being folded from the inclined low basis weight region 31, and is easily attached to the wearer's body. In particular, the inclined low basis weight regions 31 are arranged to be inclined from the pubic periphery of the wearer towards the crotch thereof. In other words, the bending start point is a shape extending along the root of the leg of the wearer. Therefore, even if the wearer walks back and forth or moves their legs back and forth, the absorbent core 11 can be three-dimensionally bent on the abdomen side of the wearer as the legs move, and is freely deformed as the body moves.

Further, as shown in fig. 6, the absorbent core 11 has a "central low basis weight region 32" at a position on the upper side of the lower end in the up-down direction of the diaper 1 (see fig. 1) and on the front side in the front-back direction (front side portion 10F), the central low basis weight region 32 being a region in which the basis weight of the absorbent core 11 is lower than the surrounding regions. The central low basis weight region 32 is the region: the basis weight of the absorbent core 11 is lower than the surrounding regions, extends in the vertical direction (longitudinal direction) at the center portion in the horizontal direction of the absorbent core 11, is substantially rectangular, and is longer in the vertical direction of the diaper 1 than in the horizontal direction. Similarly, a "central low basis weight region 33" corresponding to the central low basis weight region 32 is provided on the upper side of the lower end in the up-down direction of the diaper 1 and at a position on the rear side in the front-rear direction (the rear side portion 10R). In the present embodiment, the absorbent core 11 is not present in the central low basis weight regions 32, 33. In other words, the central low basis weight regions 32 and 33 are holes penetrating the absorbent core 11 in the thickness direction.

Note that, in addition to the inclined low basis weight regions 31 and the central low basis weight regions 32 and 33 described above, the absorbent core 11 is provided with a plurality of "low basis weight regions" in which the basis weight of the absorbent core 11 is lower than that of the surrounding regions (see fig. 6).

Next, deformation of the absorbent core 11 during use of the diaper 1 will be described in detail. Fig. 7 is a schematic perspective view showing deformation of the absorbent core 11 when the diaper 1 is worn.

In the central low basis weight regions 32 and 33 of the diaper 1, the absorbent core 11 penetrates in the thickness direction and has the lowest rigidity. Therefore, the absorbent core 11 is most easily bent and deformed in the central low basis weight regions 32 and 33. Therefore, in the case where the absorbent core 11 is sandwiched between the legs in the crotch portion of the wearer when the diaper 1 is worn, the absorbent core 11 is bent left and right in the up-down direction (the longitudinal direction of the absorbent core 11) in the portions corresponding to the central low basis weight regions 32 and 33.

Therefore, as shown in fig. 7, in the crotch region 11B located between the central low basis weight regions 32 and 33 in the longitudinal direction, the absorbent core 11 is convexly deformed toward the skin side of the wearer along the longitudinal direction, thereby forming convex portions 11 t. In other words, the central low basis weight regions 32 and 33 have a function as "fold guide regions" that allow the absorbent core 11 to be folded in the longitudinal direction in the crotch region 11B. Since the absorbent core 11 is deformed so as to protrude toward the skin side in the crotch portion 11B, the convex portions 11t are easily fitted along the excretion source and the intergluteal cleft of the wearer, and absorption of excrement in the crotch can be improved.

In the front side portion 10F, the absorbent core 11 rises along the curved surface shape of the wearer's abdomen from the crotch portion 11B to the lower abdomen portion 11A. On the other hand, in the rear side portion 10R, the absorbent core 11 rises along the curved surface shape of the wearer's buttocks from the crotch portion 11B to the buttocks portion 11C. Thus, when the diaper 1 is worn, the absorbent core 11 is deformed into the shape shown in fig. 7.

Also, the width d32 of the central low basis weight region 32 in the short-side direction is larger than the width d31 of the inclined low basis weight regions 31 in the short-side direction (d32> d 31). Therefore, the central low basis weight region 32 has lower rigidity than the inclined low basis weight regions 31, and can more easily undergo bending deformation. Therefore, when the absorbent core 11 is sandwiched between the legs of the wearer, the region between the central low basis weight regions 32 and 33 is first bent, and then the inclined low basis weight region 31 serves as a starting point of bending deformation. Therefore, when the diaper 1 is worn, the absorbent core 11 is easily convexly deformed between the central low basis weight regions 32 and 33 along the shape of the wearer's body. Further, after the diaper 1 is put on, the absorbent core 11 can be easily and naturally deformed along the inclined low basis weight regions 31 in accordance with the movement of the legs of the wearer.

However, when the absorbent core 11 is three-dimensionally deformed to have unevenness with respect to the skin of the wearer, a portion where the absorbent core 11 rises from the skin of the wearer is formed, and there is a risk that the fit in some areas deteriorates in this state. Fig. 8 is a schematic sectional view of a state where the absorbent core 11 is lifted from the body (skin) of the wearer. This fig. 8 shows a cross section cut at the lower abdominal position of the wearer and a cross sectional shape of the absorbent core 11 deformed in the lower abdominal region 11A when viewed from above.

As shown in fig. 8, the absorbent core 11 is deformed to have a substantially W-shaped cross section at the lower abdomen of the wearer. Specifically, in the central portion in the left-right direction, the absorbent core 11 undergoes bending deformation so as to protrude toward the skin side of the wearer, thereby forming the convex portions 11 t. Meanwhile, on both sides of the convex portion 11t in the left-right direction, the absorbent core 11 undergoes bending deformation so as to retract toward the skin side of the wearer starting from the pair of inclined low basis weight regions 31. As a result, a gap may be formed between the wearer's skin and the portion bent by the inclined low basis weight region 31. Further, the absorbent core 11 receives a compressive force in the left-right direction when sandwiched between the legs of the wearer, and therefore, the central portion in the left-right direction of the absorbent core 11 rises toward the non-skin side as if pushed outward from both end portions. In other words, there is a risk that the absorbent core 11 cannot easily achieve a good fit to the wearer's skin because it undergoes three-dimensional bending deformation.

In contrast, in the diaper 1 of the present embodiment, the entire inclined low basis weight region 31 of the absorbent core 11 overlaps with the front stretchable region 21s of the front belt portion 21 (see fig. 5). In other words, the region of the absorbent core 11 in which the inclined low basis weight regions 31 are disposed is subjected to the stretching property in the right-left direction. Therefore, the absorbent core 11 can be brought into close contact with the skin of the wearer due to the bending deformation experienced from the inclined low basis weight region 31. Fig. 9 is a schematic cross-sectional view of a case where the front side stretchable zone 21s applies a contracting force in the left-right direction to the absorbent core 11 in fig. 8.

In fig. 9, the portion corresponding to the inclined low basis weight region 31 of the absorbent core 11 that has been deformed to retract toward the skin side of the wearer is pushed from the non-skin side of the wearer toward the skin side by the front side stretch region 21 s. Specifically, when the absorbent core 11 is bent and deformed with the movement of the wearer's body, the front-side stretchable zone 21s exerts a contractive force in the left-right direction from the non-skin side, so the absorbent core 11 is in close contact with the wearer's skin, and a gap is less likely to be formed between the absorbent core 11 and the wearer's skin. This therefore improves the fit of the absorbent core 11 near the pubic bone of the wearer.

Note that the inclined low basis weight regions 31 of the absorbent core 11 do not necessarily have to entirely overlap the front side stretchable region 21 s. For example, even if the end portions in the up-down direction of the inclined low basis weight regions 31 are not subjected to the stretching force from the front side stretchable region 21s, it is sufficient that the absorbent core 11 can be allowed to fit to the body of the wearer (as shown in fig. 9) as long as the regions other than the end portions are subjected to the stretching force.

In addition, in the front side portion 10F, the lower ends 31ed in the up-down direction of the pair of inclined low basis weight regions 31 are positioned above the lower ends 32ed of the central low basis weight region 32. As described above, in the crotch portion 11B, the central low basis weight region 32 functions as a fold guide region for convexly deforming the absorbent core 11, and is therefore desirably provided at a position near the crotch of the wearer. On the other hand, since the inclined low basis weight regions 31 become starting points that allow the absorbent core 11 to deform as the legs and the like of the wearer move, it is desirable to dispose them near the pubic bone of the wearer. Note that the lower end 31ed of the pair of inclined low-basis weight regions 31 refers to the lower side in the up-down direction of the lower end 311ed of the first inclined low-basis weight region 311 and the lower end 312ed of the second inclined low-basis weight region 311. In the present embodiment, the lower end 311ed of the first inclined low-basis weight region 311 is the lower end 31ed of the inclined low-basis weight region 31 (see fig. 6).

Similarly, in the front side portion 10F, the upper ends 31eu of the pair of inclined low basis weight regions 31 in the up-down direction are located above the upper ends 32eu of the central low basis weight region 32. The region located above the central low basis weight region 32 in the up-down direction is a region that comes into contact with the abdomen of the wearer when the diaper 1 is worn, and this region is almost flat (see fig. 7). Therefore, the upper end 32eu is not set too high so as to suppress convex deformation of the absorbent core 11 in this region. On the other hand, the upper ends 31eu of the inclined low basis weight regions 31 are arranged as high as possible to allow deformation with the movement of the legs of the wearer until reaching the upper region of the absorbent core 11. Note that the upper end 31eu of the pair of inclined low basis weight regions 31 refers to the upper end 311eu of the first inclined low basis weight region 311 and the upper end 312eu of the second inclined low basis weight region 312, whichever is higher in the up-down direction. In the present embodiment, the upper ends 311eu of the first inclined low basis weight regions 311 have the same height as the upper ends 312eu of the second inclined low basis weight regions 312, and all of these upper ends are the upper ends 31eu of the inclined low basis weight regions 31.

In addition, the absorbent core 11 of the present embodiment has a pair of second inclined low basis weight regions 312 on the inner side in the left-right direction with respect to the pair of first inclined low basis weight regions 311, and both the first inclined low basis weight regions 311 and the second inclined low basis weight regions 312 serve as bending start points of the absorbent core 11. In the present embodiment, since the absorbent core 11 has a plurality of such bending start points in the left-right direction, the absorbent core is deformed in a stepwise manner. Specifically, since a plurality of bending start points are provided in the left-right direction, the absorbent core 11 is easily bent more gently, and a three-dimensional curved surface conforming to the shape of the wearer's body near his pubic bone is easily formed.

In addition, the length of the first inclined low basis weight regions 311 in the longitudinal direction is larger than the length of the second inclined low basis weight regions 312 in the longitudinal direction, and therefore the absorbent core 11 more easily follows the movement of the body. According to this configuration, in the pair of second inclined low basis weight regions 312 arranged on the inner sides in the left-right direction, the bending start point is short, and therefore, the absorbent core 11 undergoes less bending deformation in these inner regions. On the other hand, in the pair of first inclined low basis weight regions 311 arranged on the outer sides in the left-right direction, the bending start point is longer, and therefore the absorbent core 11 undergoes larger bending deformation in these outer regions. Therefore, the absorbent core 11 is more easily bent in the region on the outer side in the left-right direction in the vicinity of the legs of the wearer, and can more easily follow the movement of the legs.

Further, the position of the lower end 311ed of the first inclined low basis weight region 311 is lower than the position of the lower end 312ed of the second inclined low basis weight region 312 in the up-down direction. In this way, the first inclined low basis weight region 311 is formed to extend to a feasible lowest position in the up-down direction, and therefore, the absorbent core 11 also more easily undergoes bending deformation in the region near the crotch of the wearer, and more easily follows the movement of the legs of the wearer.

In addition, the first upper-side low basis weight region 341 extending in the up-down direction (longitudinal direction) is connected to the upper side in the up-down direction of the upper end 311eu of the first inclined low basis weight region 311. The first lower-side low-basis weight regions 351 extending in the up-down direction are connected to the lower sides in the up-down direction of the lower ends 311ed of the first inclined low-basis weight regions 311. Specifically, the lower ends 341ed of the first upper low basis weight regions 341 are connected to the upper ends 311eu of the first inclined low basis weight regions 311, and the lower ends 311ed of the first inclined low basis weight regions 311eu are connected to the upper ends 351eu of the first lower low basis weight regions 351, so the first upper low basis weight regions 341, the first inclined low basis weight regions 311, and the first lower low basis weight regions 351 are continuous with each other in the up-down direction.

If the first upper low basis weight region 341 is not provided continuously with the upper end 311eu of the first inclined low basis weight region 311, stress, twist, or the like due to bending deformation of the absorbent core 11 becomes concentrated at the upper end 311eu, there is a risk that the absorbent core 11 is broken at the upper end 311eu or natural deformation of the absorbent core 11 is impaired. In contrast, in the present embodiment, the first upper low basis weight region 341 and the upper end 311eu of the first inclined low basis weight region 311 are provided continuously, and therefore stress may be dispersed toward the first upper low basis weight region 341. Similarly, the first lower low basis weight regions 351 are provided continuously with the lower ends 311ed of the first inclined low basis weight regions 311, and therefore stress or the like is likely to be dispersed toward the first lower low basis weight regions 351. Therefore, the absorbent core 11 can be deformed more naturally in these regions.

In addition, a second upper-side low basis weight region 342 extending in the up-down direction (longitudinal direction) is connected to the upper side in the up-down direction of the upper end 312eu of the second inclined low basis weight region 312. Specifically, the upper end 312eu of the second slanted low basis weight region 312 is connected to the lower end 342ed of the second upper low basis weight region 342. This second upper low basis weight region 342 also disperses stress due to bending deformation occurring with the second inclined low basis weight region 312 as a starting point, similarly to the first upper low basis weight region 341 described above, thus making it possible to allow the absorbent core 11 to deform more naturally. Note that the low basis weight regions corresponding to the first lower-side low basis weight regions 351 are not provided on the lower side in the up-down direction of the lower ends 312ed of the second inclined low basis weight regions 312. The absorbent core 11 undergoes less deformation in the second inclined low basis weight regions 312 than in the first inclined low basis weight regions 311, and therefore, the influence from twisting, stress, and the like is small, and therefore, stress and the like can be sufficiently dispersed by the second upper low basis weight regions 342. Therefore, even if the low basis weight region is not provided at the lower side of the second inclined low basis weight region 312, the absorbent core 11 can be naturally deformed.

Further, in the crotch portion side region 212 located below the lower end of the end joining region 24, the front side belt portion 21 has an inclined portion 212s that is inclined inward in the left-right direction from the lower side in the up-down direction (i.e., inclined downward toward the crotch portion). When the diaper 1 is put on, in a case where both end portions in the left-right direction of the front side belt portion 21 and the rear side belt portion 22 are pulled outward to spread the waist-opening 1a, the inclined portion 212s is also pulled outward in the left-right direction, and the absorbent main body 10 joined to the inclined portion 212s is also pulled by the inclined portion 212 s. In other words, the inclined portion 212s applies a tensile force in an obliquely upward direction to the absorbent main body 10, and the absorbent main body 10 (absorbent core 11) is less likely to be displaced from the pubic periphery of the wearer, thereby achieving improved fit.

In the present embodiment, due to the stretchability provided by the front stretchable region 21s, the tensile force in the left-right direction is easily transmitted to the entire inclined portion 212 s. Further, since the leg hole elastic members 27 are arranged along the inclined portions 212s, a pulling force generated by the inclined portions 212s is likely to act on the absorbent main body 10. Therefore, even if the absorbent main body 10 becomes heavy, for example, by absorbing excrement, the absorbent main body 10 is reliably pulled up, thereby suppressing positional deviation.

Note that the absorbent core 11 does not overlap with the region where the leg elastic members 27 exhibit stretchability. Therefore, even if the absorbent main body 10 is pulled obliquely upward, an excessive force is unlikely to be applied to the absorbent core 11 itself, and moreover, the bending deformation of the absorbent core 11 is unlikely to be impaired. This suppresses the rising of the absorbent core 11 away from the wearer's body. Note that, at the lower end of the front side belt portion 21 (the lower end of the lower abdominal region 11A), the leg hole elastic members 27 are discontinuous in the left-right direction (see fig. 5). Specifically, in the lower end portion of the leg hole elastic member 27, stretchability tends to be exhibited in the up-down direction, and stretchability tends not to be exhibited in the left-right direction. Therefore, the stretching force generated by the leg hole elastic members 27 is more difficult to act on the absorbent core 11 disposed on the inner side in the left-right direction of the leg hole elastic members 27.

In the diaper 1 of the present embodiment, the inclination angle θ 212s of the inclined portion 212s with respect to the vertical direction is larger than the inclination angle θ 31 of the inclined low-basis-weight region 31 with respect to the vertical direction (θ 212s > θ 31). Here, as shown in fig. 2, the inclination angle with respect to the up-down direction means, for example, a smaller one of angles formed by the up-down direction and the inclined portion 212s and the like. If the inclination angle θ 212s of the inclined portions 212s is smaller than the inclination angle θ 31 of the inclined low basis weight region 31, the absorbent main body 10 (absorbent core 11) may be pulled more upward and not be able to exert sufficient stretchability in the left-right direction on the absorbent core 11 after undergoing bending deformation along the inclined low basis weight region 31, so that the absorbent core 11 may rise away from the skin of the wearer. There is also a risk that the absorbent core 11 undergoing bending deformation becomes twisted or distorted, resulting in poor fit. In contrast, if the inclination angle θ 212s is set to be larger than the inclination angle θ 31, the stretchability in the left-right direction is reliably exerted while allowing the absorbent core 11 to be appropriately deformed, the absorbent core 11 is easily brought into close contact with the skin of the wearer, and the fitting property can be improved.

Further, in the diaper 1, in the narrowed portion 11c where the width in the left-right direction of the absorbent core 11 is reduced, the width is smallest in the portion 11cmin, and the rigidity in the left-right direction is also lowest in the portion 11 cmin. In addition, the portion 11cmin overlaps with the anterior telescopic region 21s (see fig. 6). Therefore, when the diaper 1 is worn, the portion 11cmin is likely to become a deformation starting point when the lower abdomen portion 11A of the absorbent core 11 is deformed to rise from the crotch portion toward the lower abdomen side. In other words, the absorbent core 11 is easily deformed in the section 11cmin, and may possibly rise away from the wearer's skin. In contrast, in the present embodiment, the front stretchable region 21s exerts the stretchability in the left-right direction to the portion 11cmin where the absorbent core 11 has the smallest width in the left-right direction, thereby pressing the rising portion of the absorbent core 11 into close contact with the skin of the wearer. Thus, the absorbent core 11 deforms along the body shape of the wearer while also reliably covering the pubic periphery of the wearer, thereby making it possible to improve the fit in the above-described portions.

Further, a section 11cmin in which the width of the absorbent core 11 in the left-right direction is smallest is provided above the lower end 32ed of the central low basis weight region 32 in the up-down direction. As described above, the central low basis weight region 32 has a function as a fold guide region serving as a starting point for allowing convex deformation in the central portion of the absorbent core 11 in the left-right direction. In other words, when the diaper 1 is worn, the absorbent core 11 is deformed to protrude on the skin side in the region below the lower end 32ed of the central low basis weight region 32. Therefore, if the portion 11cmin is disposed below the lower end 32ed of the central low basis weight region 32, in this portion 11cmin, a force for convexly deforming the absorbent main body 11 in the up-down direction interferes with a force causing the absorbent main body 11 to be lifted and deformed from the crotch portion toward the lower abdomen along a shape conforming to the wearer's body shape. Therefore, there is a risk that the absorbent core 11 can no longer properly undergo deformation. In view of this, in the present embodiment, the portion 11cmin is disposed above the lower end 32ed of the central low basis weight region 32, and therefore the force acting at the position of the portion 11cmin does not interfere with the force acting at the position of the lower end 32 ed. Therefore, the absorbent core 11 can be easily deformed in an appropriate manner.

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

Description of the reference numerals

A pants-type disposable diaper (diaper, pants-type absorbent article);

1a waist opening and 1b leg opening;

10 absorbent main body, 10F front side portion, 10R back side portion;

11 absorbent core, 11A lower abdomen part, 11B crotch part, 11C buttocks part;

11c narrow part, 11t convex part;

12 a top sheet, 13a bottom sheet, 14 a side sheet;

20 an exterior member;

21 front side belt part (abdomen side external member), 21s front side expansion region;

211 a waist region, 212 a crotch region, and 212s an inclined portion;

213 a skin side sheet, 214 a non-skin side sheet, 215 a stretch nonwoven fabric;

22 rear side belt portion (back side outer attachment member), 22s rear side expansion region;

221 waistline region, 222 crotch side region, 223 skin side sheet, 224 non-skin

Side sheet, 225 stretch nonwoven fabric;

23 crotch part member (crotch part exterior member), 23s crotch part stretch region;

231 skin side sheet, 232 non-skin side sheet, 233 stretchable nonwoven fabric;

24 end joining regions;

25a, 25b welds;

26 waist elastic members, 27 leg elastic members, 28 crotch elastic members;

31 inclined low basis weight region, 31eu upper end, 31ed lower end;

311 first sloped low basis weight regions, 311eu upper ends, 311ed lower ends;

312 second sloped low basis weight regions, 312eu upper ends, 312ed lower ends;

32 central low basis weight region, 32eu upper end, 32ed lower end;

33 a central low basis weight region;

341 first upper low basis weight region, 341ed lower end;

342 second upper low basis weight region, 342ed lower end;

351 a first lower low basis weight region, 351eu upper end;

40 a leakage preventing wall portion;

41 leakage preventing wall elastic members, 42 leakage preventing wall elastic members;

CL predetermined location.

Claims

1. A pant-type absorbent article having a vertical direction, a horizontal direction, and a front-rear direction intersecting each other, comprising:

an absorbent body which is folded back and forth at a lower end portion in the vertical direction and includes an absorbent core arranged in the vertical direction; and

a front side belt portion joined to a front upper end portion of the absorbent main body and including a front side stretchable region stretchable in the left-right direction,

the pants-type absorbent article is characterized in that,

the absorbent core includes a front side portion that is a portion bent toward the front side in the front-rear direction,

the absorbent core includes a pair of slanted low basis weight regions in the front side portion,

the pair of inclined low basis weight regions are inclined from the upper side to the lower side in the up-down direction and from the outer side to the center side in the left-right direction,

the pair of slanted low basis weight regions have a lower basis weight than the surrounding regions,

the pair of inclined low basis weight regions are disposed obliquely from the wearer's pubic periphery along the crotch portion thereof when worn,

the pair of slanted low basis weight regions entirely overlaps the front side stretch region,

the pair of slanted low basis weight regions comprises a pair of first slanted low basis weight regions and a pair of second slanted low basis weight regions,

the pair of second inclined low basis weight regions are provided in regions inward in the left-right direction of the pair of first inclined low basis weight regions.

2. A pant-type absorbent article according to claim 1,

a central low basis weight region provided in the front side portion at a position between the left-right direction of the pair of inclined low basis weight regions,

the central low basis weight region penetrates the absorbent core in the up-down direction.

3. A pant-type absorbent article according to claim 2,

the width of the central low basis weight region in the short-side direction is larger than the width of each of the pair of inclined low basis weight regions in the short-side direction.

4. A pant-type absorbent article according to claim 2 or 3,

the lower ends of the pair of inclined low basis weight regions are located higher than the lower end of the central low basis weight region in the up-down direction.

5. A pant-type absorbent article according to claim 2 or 3,

the upper ends of the pair of inclined low basis weight regions are located higher than the upper end of the central low basis weight region in the up-down direction.

6. A pant-type absorbent article according to any one of claims 1 to 3,

the pants-type absorbent article further comprises:

a rear side belt portion joined to a rear upper end portion of the absorbent main body and including a rear side stretchable region stretchable in the left-right direction; and

end joining regions joining both ends in the left-right direction of the front side belt portion to both ends in the left-right direction of the rear side belt portion,

the lower end edge of the front side band portion includes an inclined portion that is inclined downward from the lower end of the end joining region toward the crotch portion.

7. A pant-type absorbent article according to claim 6,

a smaller angle of angles formed by the inclined portions and the up-down direction is larger than a smaller angle of angles formed by the inclined low-basis-weight regions and the up-down direction.

8. A pant-type absorbent article according to claim 6,

also comprises a leg surrounding elastic component which stretches along the inclined part,

the region where the leg elastic members exhibit stretchability does not overlap the absorbent core.

9. A pant-type absorbent article according to any one of claims 1 to 3,

the absorbent core includes a narrowed portion in which a width in the left-right direction becomes smaller at the front side portion,

the portion of the narrow portion having the smallest width in the left-right direction overlaps the front telescopic region.

10. A pant-type absorbent article according to claim 9,

a central low basis weight region is provided in the front side portion at a position between the left-right direction of the pair of inclined low basis weight regions,

the central low basis weight region penetrates the absorbent core in the up-down direction,

in the vertical direction, a position of a portion of the narrow portion having a smallest width in the horizontal direction is higher than a position of a lower end of the central low basis weight region.

11. A pant-type absorbent article according to any one of claims 1 to 3,

the length in the lengthwise direction of the pair of second slanted low basis weight regions is smaller than the length in the lengthwise direction of the pair of first slanted low basis weight regions.

12. A pant-type absorbent article according to any one of claims 1 to 3,

the position of the lower end of the pair of second inclined low basis weight regions is higher than the position of the lower end of the pair of first inclined low basis weight regions in the up-down direction.

13. A pant-type absorbent article according to any one of claims 1 to 3,

the absorbent core includes at the front side portion:

a first upper low basis weight region extending in the up-down direction and having a basis weight lower than that of the surrounding region; and

a first lower low basis weight region extending in the up-down direction and having a basis weight lower than that of the surrounding region,

the lower end of the first upper low basis weight region is connected to the upper end of the first inclined low basis weight region, and

the lower end of the first sloping low basis weight region is connected to the upper end of the first lower low basis weight region.

14. A pant-type absorbent article according to any one of claims 1 to 3,

the absorbent core includes a second upper low basis weight region extending in the up-down direction and having a basis weight lower than that of the surrounding region at the front side portion, and

the lower end of the second upper low basis weight region is connected to the upper end of the second inclined low basis weight region.