CN111447903B

CN111447903B - Pants-type absorbent article

Info

Publication number: CN111447903B
Application number: CN201880077259.2A
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: 2018-12-04
Publication date: 2021-07-09
Anticipated expiration: 2038-12-04
Also published as: CN111447903A; WO2019131008A1; TWI693065B; JP6600677B2; TW201932084A; JP2019118557A

Abstract

A pants-type absorbent article (1) having an absorbent body (10), the absorbent body (10) having an absorbent core (11) disposed along a vertical direction, and the absorbent body (10) being folded back and forth at a lower end portion in the vertical direction, wherein the absorbent core (11) has a rear side portion (10R) which is a portion folded back toward a rear side in the horizontal direction, and the absorbent core (11) has: a rear low basis weight region (39) having a lower average basis weight than the surrounding regions; and a hip high basis weight region (55) which is provided at a position above the rear low basis weight region (39) in the vertical direction, has an average basis weight higher than that of the rear low basis weight region (39), and at least a part of a boundary portion (55BF) between the rear low basis weight region (39) and the hip high basis weight region (55) is inclined obliquely downward from the center in the right direction toward both outer sides.

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. Further, the following techniques are known: by providing slits or the like in a part of the absorbent core to reduce the rigidity, the absorbent core is easily bent at the low rigidity portion and is easily deformed three-dimensionally along the body of the wearer when the pants-type absorbent article is worn. For example, patent document 1 discloses an absorbent article in which: the absorbent core was divided into 3 regions, i.e., a front side portion, a middle portion, and a back side portion, in the longitudinal direction, and groove-shaped concave portions were provided in the respective regions, and these concave portions were connected to each other.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2012-143535

Disclosure of Invention

The absorbent body of the absorbent article of patent document 1 is likely to be deformed, and the concave portions of the intermediate portion and the back side portion are connected to each other, and hence the fit may be deteriorated. For example, deformation of the concave portion of the middle portion, which is a bending start point of the absorbent core, in the crotch portion of the wearer induces deformation of the concave portion of the back side portion, and there is a possibility that deformation of the absorbent core along the shape of the buttocks is less likely to occur in the back side portion of the wearer. When the wearer moves the legs forward and backward while walking, forces in opposite directions (forward and backward directions) act on the widthwise opposite sides of the absorbent core in the crotch portion (intermediate portion), and when these forces in opposite directions are transmitted to the back side portion, wrinkles may easily occur in the hip region. Therefore, the fitting properties and the skin feel of the absorbent article such as patent document 1 may be deteriorated in the crotch portion and the crotch portion.

The present invention has been made in view of the above-described problems, and an object thereof is to provide a pants-type absorbent article that can achieve good fit between the crotch portion and the buttocks of the absorbent core.

A main aspect of the present invention for achieving the above object is a pants-type absorbent article having a vertical direction, a horizontal direction, and a front-rear direction intersecting with each other, the pants-type absorbent article having an absorbent main body having an absorbent core disposed along the vertical direction, the absorbent main body being folded back and forth at a lower end portion in the vertical direction, characterized in that the absorbent core has a rear side portion which is a portion folded back toward a rear side in the front-rear direction, the absorbent core having, at the rear side portion: a rear low basis weight region having a lower average basis weight than the surrounding regions; and a hip high basis weight region which is provided at a position above the rear low basis weight region in the vertical direction, has a higher average basis weight than the rear low basis weight region, and at least a part of a boundary between the rear low basis weight region and the hip high basis weight region is inclined obliquely downward from the center in the horizontal direction toward both outer sides.

Other features of the present invention will be apparent from the description of the present specification and the accompanying drawings.

Effects of the invention

According to the present invention, a pants-type absorbent article can be provided that can achieve good fit between the crotch portion and the buttocks of the absorbent core.

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 of fig. 2.

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

Fig. 5 is a schematic plan view of the diaper 1 in an unfolded and stretched state, and is a diagram illustrating the positional relationship between various 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 illustrating deformation of the absorbent core 11 when the diaper 1 is worn.

Detailed Description

At least the following matters will be made clear from the description of the present specification and the drawings.

A pant-type absorbent article having a vertical direction, a horizontal direction, and a front-rear direction intersecting with each other, the pant-type absorbent article having an absorbent main body having an absorbent core disposed along the vertical direction, the absorbent main body being folded back and forth at a lower end portion in the vertical direction, characterized in that the absorbent core has a rear side portion which is a portion folded back toward a rear side in the front-rear direction, the absorbent core having, at the rear side portion: a rear low basis weight region having a lower average basis weight than the surrounding regions; and a hip high basis weight region which is provided at a position above the rear low basis weight region in the vertical direction, has a higher average basis weight than the rear low basis weight region, and at least a part of a boundary between the rear low basis weight region and the hip high basis weight region is inclined obliquely downward from the center in the horizontal direction toward both outer sides.

According to such a pants-type absorbent article, the force compressing the absorbent core in the right-left direction is suppressed from being transmitted from the crotch portion to the hip portion side by the hip high basis weight region. The absorbent core is inclined along the boundary between the rear low basis weight region and the hip high basis weight region, and is deformed so as to wrap the hips of the wearer. This improves the fit of the absorbent core in the region from the crotch portion to the buttocks.

In the pants-type absorbent article, the rear low basis weight region preferably has a longitudinal portion extending in the vertical direction.

According to such a pants-type absorbent article, the absorbent core is easily deformed by bending from the longitudinal portion in the region from the crotch portion to the buttocks. This facilitates three-dimensional deformation of the absorbent core from the wearer's crotch along the body shape in the vicinity of the buttocks.

The pants-type absorbent article preferably has a rear side belt portion having a rear side stretchable region stretchable in the left-right direction, the rear side belt portion being connected to the absorbent main body, and at least a part of the rear side low basis weight region overlapping the rear side stretchable region in the up-down direction.

According to such a pants-type absorbent article, a contraction force in the left-right direction acts on the rear low-basis-weight region at a portion overlapping the rear stretchable region. This makes it easy for the absorbent core to contract and deform at the overlapping portion, and for external forces generated by the movement of the legs of the wearer to be absorbed. Thus, the adhesiveness of the absorbent core is further improved.

In the pants-type absorbent article, the hip high basis weight region and the rear stretchable region preferably overlap each other in the vertical direction.

According to such a pants-type absorbent article, the high-basis-weight hip region having high rigidity is easily deformed by the contraction force acting on the rear stretchable region. Then, by applying a contraction force from the non-skin side, the hip high basis weight region is pressed against the skin side of the wearer. Therefore, the hip high basis weight region deforms so as to form a curved surface along the roundness of the hip of the wearer, and is easily brought into close contact with the skin of the wearer, and the fit of the absorbent core can be further improved.

The pants-type absorbent article preferably has a rear side belt portion having a rear side stretchable region stretchable in the left-right direction, the rear side belt portion being connected to the absorbent main body, and at least a part of the rear side low basis weight region overlapping the rear side belt portion in the up-down direction.

According to such a pants-type absorbent article, the rigidity of the non-skin side of the rear low-basis-weight region is easily ensured at the portion overlapping the rear belt portion. Therefore, the absorbent core is more easily bent toward the skin side than the non-skin side, and even when an excessive external force acts on the rear low basis weight region, the external force can be buffered by the rear belt section, and the breakage of the absorbent core can be suppressed.

In the pants-type absorbent article, the absorbent core preferably has a hip low basis weight region having a lower average basis weight than surrounding regions in a position above the hip high basis weight region in the rear side portion.

According to such a pants-type absorbent article, the low basis weight regions are provided on the upper side (hip side) and the lower side (crotch side) with the high basis weight regions of the hips interposed therebetween, and the absorbent core can be easily deformed more naturally in each region.

In the pants-type absorbent article, at least a part of a boundary between the hip high basis weight region and the hip low basis weight region is preferably inclined obliquely downward from the center in the left-right direction toward both outer sides.

According to such a pants-type absorbent article, the region of the absorbent core above the hip high basis weight region is inclined and raised along the inclination of the boundary portion, and a curved surface such as a circular shape that wraps the hip of the wearer is easily formed.

In the pants-type absorbent article, it is preferable that a smaller angle of angles formed by boundaries between the rear low basis weight regions and the hip high basis weight regions with respect to the left-right direction is larger than a smaller angle of angles formed by boundaries between the hip high basis weight regions and the hip low basis weight regions with respect to the left-right direction.

According to such a pants-type absorbent article, the amount of deformation of the absorbent core can be increased by increasing the inclination angle at the boundary portion near the crotch portion, and the bending deformation of the absorbent core is likely to occur. On the other hand, in the boundary portion near the buttocks, the absorbent core is easily deformed gently along the roundness of the buttocks by reducing the inclination angle.

In the pants-type absorbent article, the length in the left-right direction of the boundary between the hip high basis weight region and the hip low basis weight region is preferably longer than the length in the left-right direction of the boundary between the rear low basis weight region and the hip high basis weight region.

According to such a pants-type absorbent article, the deformable region of the absorbent core can be made wider at the boundary portion near the buttocks of the wearer. Therefore, a wide region of the buttocks can be easily covered with the absorbent core, and the fit can be further improved.

In the pants-type absorbent article, the hip low basis weight region preferably has a plurality of longitudinal portions extending in the up-down direction, and an upper end position of at least a part of the longitudinal portions in the up-down direction is preferably the same as an upper end position of the absorbent core.

According to such a pants-type absorbent article, since a portion having a low basis weight and low rigidity is formed at the upper end edge of the absorbent core, the upper end edge portion is easily deformed flexibly. Therefore, the upper end portion of the absorbent core is easily deformed in accordance with the curve of the waist circumference of the wearer on the hip side, and the skin at the waist circumference can be made soft to the touch.

Preferably, the pants-type absorbent article has the rear side low basis weight region having: a longitudinal portion along the vertical direction; and a plurality of transverse portions intersecting the longitudinal portions.

According to such a pants-type absorbent article, the longitudinal portion extending in the vertical direction and the lateral portion extending in the horizontal direction are provided so as to intersect with each other, whereby the absorbent core can be more flexibly deformed in the crotch portion.

The pants-type absorbent article preferably has a crotch member which is stacked on the non-skin side of the absorbent core and has a crotch stretch region which stretches in the up-down direction, and at least a part of the rear-side low-basis-weight region overlaps with the crotch stretch region.

According to such a pants-type absorbent article, the absorbent core is deformed so as to bend along the crotch portion of the wearer in the rear low basis weight region by the vertical stretchability being applied to the rear low basis weight region of the absorbent core from the non-skin side. Further, the absorbent core is easily bent toward the skin side, and therefore, deformation along the body shape of the wearer is promoted.

In the pants-type absorbent article, a central low basis weight region is preferably provided below the hip high basis weight region in the vertical direction and in the center in the horizontal direction in the rear side portion, and the central low basis weight region penetrates the absorbent core in the vertical direction.

According to such a pants-type absorbent article, when the absorbent core is sandwiched between the legs in the crotch region of the wearer, the absorbent core is easily bent and deformed in a convex manner toward the skin side in the vertical direction with the central low basis weight region having the lowest rigidity as a starting point. Thus, the absorbent core is easily fitted along the excretory opening and the cleft of the buttocks of the wearer.

In the pants-type absorbent article, it is preferable that a 2 nd hip high basis weight region is provided on the rear side low basis weight region of the rear side portion on a lower side in the vertical direction, and an average basis weight of the 2 nd hip high basis weight region is higher than that of the rear side low basis weight region.

According to such a pants-type absorbent article, even when a large force acts on the absorbent core in the crotch portion, a part of such a force is relaxed in the 2 nd hip high basis weight region, and transmission of the large force from the crotch portion side to the hip portion side is easily suppressed. This can further improve the adhesiveness of the absorbent core.

Embodiments of the present invention are described in detail below with reference to the accompanying drawings

Hereinafter, as the "pants-type absorbent article" of the present invention, an embodiment will be described taking a pants-type disposable diaper 1 for adults (hereinafter also referred to as "diaper 1") as an example. Among them, the pants-type absorbent article of the present invention can be applied to, for example, disposable diapers for children, sanitary products (pants-type sanitary napkins), and the like.

< integral 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 of fig. 2. The "extended state" of the diaper 1 is a state in which the diaper 1 is extended without wrinkles, and is a state in which the dimensions of each member (for example, an exterior member 20 described later) constituting the diaper 1 are extended to a length that matches or is 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 stacked. In the vertical direction, the upper side is the side of the upper body of the wearer and the lower side is the side of the crotch of the wearer. In the front-rear direction, the side on the ventral side of the wearer is referred to as the front side, and the side on the dorsal side of the wearer is referred to as the rear side. In the thickness direction, the side that contacts the wearer's body is referred to as the skin side, and the opposite side is referred to as the non-skin side. In the developed state of fig. 2, the diaper 1 has a longitudinal direction and a width direction intersecting each other. The longitudinal direction is a direction along the vertical direction, and the width direction is the same direction as the horizontal direction.

The diaper 1 has a rectangular absorbent body 10 in plan view and an exterior member 20 positioned on the non-skin side of the absorbent body 10. The exterior member 20 includes: a ventral outer member 21 (front belt 21) positioned on the front side in the front-rear direction of fig. 1; a back-side exterior member 22 (back-side belt portion 22) positioned on the back side in the front-back direction; and a crotch exterior member 23 (crotch member 23) connecting the front-side exterior member 21 and the back-side exterior member 22. The above-mentioned members adjacent in the thickness direction are joined by an adhesive or the like.

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 side where the front side belt portion 21 is located is referred to as the front side, and the side where the rear side belt portion 22 is located is referred to as the rear side. That is, the front side belt portion 21 is located at the front side upper end portion of the absorbent main body 10, and the rear side belt portion 22 is located at the rear side upper end portion of the absorbent main body 10. The crotch member 23 is positioned closer to the skin than the front belt portion 21 and the back belt portion 22.

In the diaper 1 of the present embodiment, the outer covering member 20 is constituted by 3 members, but is not limited thereto. For example, the front side belt part 21, the back side belt part 22 and the crotch part 23 may be one member. Further, the crotch member 23 may not be provided, or a member different from the exterior member 20 may be further laminated on the non-skin side of the exterior member 20.

The diaper 1 in the unfolded state shown in fig. 2 is a pants-type diaper shown in fig. 1 as follows: the absorbent body 10 is folded back and forth at a predetermined position CL in the longitudinal direction, and both lateral side portions of the front side belt portion 21 and both lateral side portions of the rear side belt portion 22 are joined by welding means or the like. That is, the longitudinal direction of the absorbent body 10 is along the vertical direction of the diaper 1, and the front side belt portion 21 and the rear side belt portion 22 are connected in a loop shape to form a waist opening 1a and a pair of leg openings 1 b. Hereinafter, the region where the front side band portion 21 and the rear side band portion 22 are joined together is referred to as an end joining region 24.

In the present specification, in the absorbent body 10 (absorbent core 11) folded at the predetermined position CL, a portion folded forward is referred to as a "front side portion 10F", and a portion folded backward is referred to as a "rear side portion 10R". That is, in the longitudinal direction of fig. 2, a region on the front side of the predetermined position CL of the absorbent main body 10 (absorbent core) 11 is sometimes referred to as a "front side portion 10F", and a region on the rear side of the predetermined position CL is sometimes referred to as a "rear side portion 10R".

As shown in fig. 3, the absorbent main body 10 has: 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 a-a of fig. 4A. In fig. 4B, a low basis weight region (described later) provided in the absorbent core 11 is not shown for the sake of simplicity of explanation.

The absorbent core 11 is a member that absorbs and retains excretory fluid such as urine, and is formed of liquid absorbent fibers such as pulp fibers mixed with a Super Absorbent Polymer (SAP), for example. The absorbent core 11 of the present embodiment has the 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 the absorbent core 11 has a substantially hourglass shape as shown in fig. 4A in a plan view. In the absorbent core 11, various low basis weight regions, which are regions having a lower basis weight (basis weight) than the surrounding regions, are formed. Details of the low basis weight region will be described later. The outer peripheral surface of the absorbent core 11 may be covered with a liquid-permeable sheet such as a tissue or nonwoven fabric.

The top sheet 12 is a liquid-permeable sheet, and for example, a hydrophilic air-permeable nonwoven fabric, a spunbond nonwoven fabric or the like is used. The back sheet 13 has a two-layer structure of a liquid-impermeable sheet 13a and a hydrophobic sheet 13b disposed on the non-skin side of the liquid-impermeable sheet 13 a. For example, a resin film or the like is used as the liquid-impermeable sheet 13a, and a flexible hydrophobic nonwoven fabric or the like is used as the hydrophobic sheet 13 b. Further, the backsheet 13 may have a single-layer structure of the 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 lateral direction from both ends 11es and 11es in the lateral direction of the absorbent core 11, and is folded back inward in the lateral direction and toward the skin side in the thickness direction with both ends 10es and 10es in the lateral direction of the absorbent main body 10 as folded-back positions, thereby forming 1 pair of leakage preventing wall portions 40. The leakage preventing wall

elastic members

41 and 42 such as string glue are fixed to the leakage preventing wall 40 in a state of being elongated in the longitudinal direction (vertical direction) of the absorbent main body 10. The leakage preventing wall

elastic members

41 and 42 are contracted in the longitudinal direction so that the pair of leakage preventing wall portions 40 stand up toward the skin side at both ends in the lateral direction of the absorbent main body 10, and function as leakage preventing walls of the diaper 1. The leakage preventing wall 40 may be formed by extending the chassis 13 (liquid-permeable sheet 13b) to the outside in the lateral direction of the absorbent core 11 without providing the side sheet 14.

As shown in fig. 2, the front side band portion 21 and the rear side band portion 22 each have, in the vertical direction:

waist regions

211 and 221 where the end joining regions 24 are located; and

crotch side regions

212 and 222 below the

waist regions

211 and 221. The

waist regions

211 and 221 are rectangular in plan view. The

crotch region

212, 222 is substantially trapezoidal, and the outer edge of the

crotch region

212, 222 has inclined

portions

212s, 222s inclined inward in the lateral direction toward the lower side in the vertical direction. That is, the

crotch region

212, 222 is laterally narrower toward the lower side. In the present embodiment, the crotch region 222 of the back side belt part 22 is larger than the crotch region 221 of the front side belt part 21, and thus the hip of the wearer can be covered more widely.

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

skin side sheets

213, 223 on the skin side;

non-skin side panels

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

nonwoven fabrics

215 and 225 which are positioned therebetween and have stretchability at least in the right-left direction of the diaper 1.

The

skin side sheets

213 and 223 and the

non-skin side sheets

214 and 224 are preferably soft sheets, and for example, Spunbond nonwoven fabrics or SMS nonwoven fabrics (Spunbond + meltblow + Spunbond nonwoven fabrics) are used.

The stretchable

nonwoven fabrics

215 and 225 are, for example, the following ones: the gear is stretched by an appropriate stretching treatment such as gear stretching, while including a polyurethane elastomer as an elastic thermoplastic elastic fiber and a polypropylene (PP) as a polyolefin resin as an inelastic thermoplastic resin fiber. The stretch

nonwoven fabrics

215 and 225 are made stretchable in a predetermined direction by this stretching treatment. The stretching process may be performed in directions orthogonal to each other, or may be performed only in a predetermined direction. When the stretching treatment is performed only in the predetermined direction, the stretchability in the predetermined direction is exhibited, but since the orientation of all the fibers is not limited to being along the predetermined direction, the stretchability is also exhibited in a direction perpendicular 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 bonded to each other by a plurality of discrete fusion-bonded

portions

25a and 25b (for example, regions where ultrasonic fusion is performed), and therefore, for example, the skin feels softer than when bonded to each other by a cured adhesive. Then, between the welded

portions

25a and 25b, the stretchable

nonwoven fabrics

215 and 225 are contracted so that the

skin side sheets

213 and 223 and the

non-skin side sheets

214 and 224 protrude so as to be bent outward in the thickness direction. That is, the

skin side sheets

213 and 223 and the

non-skin side sheets

214 and 224 bulge between the welded

portions

25a and 25b, and the skin feels softer, and the user can be visually given a soft impression.

With such a configuration, the front side belt portion 21 and the rear side belt portion 22 have stretchability in the lateral direction (and the vertical direction) of the diaper 1 as a whole. A region in which the lateral stretchability is exhibited in the front side belt portion 21 is referred to as a front side stretchable region 21s, and a region in which the lateral stretchability is exhibited in the rear side belt portion 22 is referred to as a rear side stretchable region 22s (see the mesh portion in fig. 5). The fused

portions

25a and 25b are dispersed at relatively narrow intervals as shown in fig. 2. Therefore, the diaper 1 of the present embodiment extends in a plurality of directions, and therefore, a very small bulge (wrinkle) is generated, and generation of unidirectional wrinkles (longitudinal wrinkles and the like) unique to the diaper can be prevented, and therefore, the appearance of the diaper 1 is good.

In addition, an elastic film may be used instead of the elastic

nonwoven fabrics

215 and 225. However, since the stretchable film has a substantially uniform thickness, the swelling and flattening of the

skin side sheets

213 and 223 and the

non-skin side sheets

214 and 224 between the welded

portions

25a and 25b are facilitated. On the other hand, the stretchable

nonwoven fabrics

215 and 225 have a large thickness between the welded

portions

25a and 25b, and are less likely to bulge and flatten the

skin side sheets

213 and 223 and the

non-skin side sheets

214 and 224, thereby maintaining softness and beauty of the skin feel.

In the first dispersion region X overlapping the absorbent main body 10 in the thickness direction and the second dispersion region Y other than the first dispersion region X, the fusion-bonded

portions

25a and 25b may be dispersed in different regions, and the shapes of the fusion-bonded

portions

25a and 25b and the proportions of the fusion-bonded

portions

25a and 25b per unit area may be different from each other. In fig. 2, in the 1 st dispersion area X, the substantially rectangular fusion-bonded portions 25a inclined at 45 degrees or-45 degrees with respect to the left-right direction are alternately arranged. On the other hand, in the 2 nd dispersion area Y, the circular fusion-bonded portions 25b are arranged in a staggered manner.

The area of the welded portion 25b per unit area in the 2 nd dispersion area Y is smaller than that in the 1 st dispersion area X. Therefore, in the

waist regions

211 and 221 which are likely to cause problems such as perspiration and stuffiness, it is possible to ensure appropriate air permeability while preventing the air permeability from being blocked by the welded portions 25 b. On the other hand, in the 1 st dispersion region X overlapping the absorbent body 10, contraction of the front side belt portion 21 and the rear side belt portion 22 is appropriately suppressed, and contraction in the left-right direction of the absorbent body 10 can be reduced.

The front side belt portion 21 and the rear side belt portion 22 are provided with a plurality of elastic members 26 such as string glue in a region along the waist opening 1 a. Similarly, a plurality of leg hole elastic members 27 such as string glue are provided in the region along the leg hole openings 1 b. That is, the waist and leg circumferences of the diaper 1 are closely attached to the body of the wearer through the waist elastic members 26 and the leg elastic members 27, and therefore, the diaper 1 can be prevented from coming off or leaking from the leg circumferences. On the other hand, the other portions are gently fitted to the body of the wearer over the entire surface by the stretchable

nonwoven fabrics

215 and 225, and therefore the feeling of tightness is reduced.

The crotch member 23 has a substantially hourglass shape curved inward in the lateral direction at the center in the longitudinal direction in a plan view. As shown in fig. 3, the crotch 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 positioned therebetween and which imparts stretchability in the vertical direction of the diaper 1 (the longitudinal direction of the absorbent main body 10). These pieces 231 to 233 are joined by a plurality of fusion-bonded portions (for example, fusion-bonded portions 25b similar to the 2 nd dispersion region Y). A region in which stretchability in the vertical direction is exhibited in the crotch member 23 is referred to as a crotch stretch region 23s (see the 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 excretion. Further, a plurality of crotch elastic members 28 are arranged in the crotch member 23 in the region along the leg hole openings 1b so that the crotch member 23 is in close contact with the leg holes of the wearer.

< deformation of absorbent core 11 >)

The case where the absorbent core 11 (absorbent main body 10) deforms in accordance with the movement of the wearer's body when the diaper 1 is worn will be described.

Fig. 5 is a schematic plan view of the diaper 1 in an unfolded and extended state, and is a diagram illustrating the positional relationship between the various 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 abdomen region 11A" located on the lower abdomen of the wearer when worn; a "crotch region 11B" located in the crotch of the wearer when worn; and a "hip region 11C" which is positioned at the hip of the wearer when worn. In fig. 5, a portion overlapping the front side belt portion 21 is referred to as a lower abdomen portion 11A, a portion overlapping the rear side belt portion 22 is referred to as a hip portion 11C, and a portion between the lower abdomen portion 11A and the hip portion 11C is referred to as a crotch portion 11B. That is, 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 rear side portion 10R of the diaper 1. The crotch region 11B is a region located at the lower end in the vertical direction of the diaper 1 and provided across the front side portion 10F and the back side portion 10R across a predetermined position CL.

However, the range of the "crotch region 11B" shown in fig. 5 is an example, and is not limited thereto. For example, the central region at 1/3 in the region from the lower end of the end joining region 24 of the front side belt portion 21 to the lower end of the end joining region 24 of the rear side belt portion 22 in the longitudinal direction may be used as the crotch region.

The absorbent core 11 has a "crotch low basis weight region 36" in the crotch region 11B, which is a region where the basis weight of the absorbent core 11 is lower than that in the surroundings. The crotch low basis weight region 36 is formed by intersecting a longitudinal portion 36l in the vertical direction (longitudinal direction of the absorbent core) and a lateral portion 36w in the horizontal direction (width direction of the absorbent core). The longitudinal portions 36l are provided in plurality at intervals in the left-right direction in the crotch portion 11B, and the lateral portions 36w are provided in each longitudinal portion 36l at intervals in the up-down direction.

The "basis weight" of the absorbent core 11 means the mass (g/m) of the absorbent core 11 (e.g., liquid absorbent fibers mixed with SAP) per unit area²). The basis weight of the crotch low basis weight region 36 and the surrounding absorbent core 11 can be compared by a known method. For example, a method of performing comparison by a visual confirmation method may be used. Further, there is a method of: cutting out a target portion from the absorbent core 11 as a sampleThe mass of each sample and the area of each sample are measured, and the mass per unit area is calculated and compared. The same applies to other low basis weight regions described below.

The absorbent core 11 is likely to be folded from the crotch low basis weight region 36 due to the difference in rigidity between the crotch low basis weight region 36 and the surroundings. Therefore, when the diaper 1 is worn, the absorbent core 11 is easily deformed in accordance with the irregularities of the wearer's body by being bent from the crotch low basis weight region 36, and thus easily fits the wearer's body. In particular, the crotch region 11B is a region that is likely to receive a compressive force in the lateral direction by being sandwiched between the legs of the wearer when the diaper 1 is worn. In the crotch region 11B, the longitudinal portions 36l extending in the vertical direction and the lateral portions 36w extending in the lateral direction intersect with each other, whereby the absorbent core 11 can be more easily deformed flexibly.

As shown in fig. 6, the absorbent core 11 has a region of lower basis weight of the absorbent core 11 than the surrounding region, i.e., "2 nd crotch low basis weight region 37", at a position above the crotch low basis weight region 36 in the vertical direction and behind (the rear side portion 10R) in the front-rear direction. The 2 nd crotch low basis weight region 37 has substantially the same structure as the crotch low basis weight region 36, and is formed by intersecting a longitudinal portion 37l in the vertical direction (longitudinal direction of the absorbent core) and a plurality of lateral portions 37w in the lateral direction (width direction of the absorbent core). The 2 nd crotch low basis weight region 37 is disposed across the crotch region 11B and the hip region 11C. In order to distinguish the aforementioned crotch low basis weight region 36 from the 2 nd crotch low basis weight region 37, the crotch low basis weight region 36 may be hereinafter referred to as "1 st crotch low basis weight region 36".

The absorbent core 11 also has a region of the absorbent core 11 having a lower basis weight than the surrounding region, i.e., a "central low basis weight region 32", between the longitudinal direction of the longitudinal portion 37l of the 2 nd crotch low basis weight region 37 and above the 1 st crotch low basis weight region 36 in the vertical direction and on the front side in the front-rear direction (front side portion 10F). The central low basis weight region 32 is disposed in the central portion in the left-right direction of the absorbent core 11 along the up-down direction (the longitudinal direction of the absorbent core 11), and is a substantially rectangular region having a basis weight lower than that of the periphery and being longer in the up-down direction than in the left-right direction. Similarly, a "central low basis weight region 33" corresponding to the central low basis weight region 32 is provided in the central portion in the lateral direction on the upper side in the vertical direction and on the rear side in the front-rear direction (rear side portion 10R) with respect to the crotch low basis weight region 36. In the present embodiment, the absorbent core 11 is not present in the central low

basis weight regions

32, 33. That is, the central low

basis weight regions

32 and 33 are holes penetrating the absorbent core 11 in the thickness direction.

Of these low basis weight regions (32, 33, 36, 37), the 2 nd crotch low basis weight region 37 and the central low basis weight region 33 provided in the back side portion 10R (not provided in the front side portion 10F) are collectively referred to as "back side low basis weight region 39" (see fig. 6).

Further, a "hip high basis weight region 55" having a higher basis weight than the 2 nd crotch low basis weight region 37 (and the central low basis weight region 33) is provided in the rear portion 10R of the absorbent body 10 at a position vertically above (rear side in the longitudinal direction) the rear low basis weight region 39. The hip high basis weight region 55 is a region continuous in the left-right direction, and the boundary between the rear low basis weight region 39 and the hip high basis weight region 55 is inclined obliquely downward from the center in the left-right direction toward both outer sides. Therefore, the hip high basis weight region 55 has a substantially U-shaped or V-shaped shape as shown in fig. 6. The "boundary" between the rear low basis weight region 39 and the hip high basis weight region 55 is a line (curved line) continuously connecting the upper end in the vertical direction (rear end in the longitudinal direction) of the longitudinal portion 37l of the 2 nd crotch low basis weight region 37 and the upper end in the vertical direction (rear end in the longitudinal direction) of the central low basis weight region 33, and is shown by a broken line in fig. 6. Hereinafter, the boundary between the rear low basis weight region 39 and the hip high basis weight region 55 will also be referred to as "1 st boundary 55 BF".

The "basis weight" of the rear low basis weight region 39 is an average basis weight of a region surrounded by the longitudinal portions 37l disposed at both ends in the left-right direction and the broken lines at both ends in the up-down direction in fig. 6. Similarly, the basis weight of the hip high basis weight region 55 is the average basis weight of the regions sandwiched between the rear low basis weight region 39 and the hip low basis weight region 38 (described later).

Further, a region of the absorbent core 11 having a lower basis weight than the surrounding region, i.e., "a hip low basis weight region 38", is provided at a position on the upper side in the vertical direction (the rear side in the longitudinal direction) of the rear side portion 10R of the absorbent main body 10 with respect to the hip high basis weight region 55. The hip low basis weight region 38 has substantially the same structure as the 2 nd crotch low basis weight region 37, and includes a longitudinal portion 38l and a lateral portion 38 w.

The boundary between the hip high basis weight region 55 and the hip low basis weight region 38 is inclined obliquely downward from the center in the lateral direction toward both outer sides. The "boundary" between the hip high basis weight region 55 and the hip low basis weight region 38 is a line (curved line) continuously connecting the lower ends in the vertical direction (front end in the longitudinal direction) of the longitudinal portions 38l of the hip low basis weight region 38, and is shown by a broken line in fig. 6. Hereinafter, the boundary between the hip high basis weight region 55 and the hip low basis weight region 38 will also be referred to as "2 nd boundary 55 BR". The "basis weight" of the hip low basis weight region 38 is an average basis weight of a region surrounded by the longitudinal portion 38l disposed at both ends in the left-right direction, the 2 nd boundary portion 55BR, and the rear end edge of the absorbent core 11 in fig. 6.

Next, the deformation of the absorbent core 11 when the diaper 1 is worn will be specifically described. Fig. 7 is a schematic perspective view illustrating deformation of the absorbent core 11 when the diaper 1 is worn.

The central low

basis weight regions

32 and 33 penetrate the absorbent core 11 in the thickness direction and have the lowest rigidity. That is, the absorbent core 11 is most likely to be subjected to bending deformation in the central low

basis weight regions

32, 33. Therefore, when the absorbent core 11 is sandwiched between the legs at the crotch of the wearer while wearing the diaper 1, the absorbent core 11 is bent to the left and right in the vertical direction (the longitudinal direction of the absorbent core 11) at the portions of the central low

basis weight regions

32, 33. As a result, in the crotch region 11B between the central low

basis weight regions

32, 33 in the longitudinal direction, the absorbent core 11 deforms convexly toward the skin of the wearer along the longitudinal direction, forming convex portions 11t, as shown in fig. 7. That is, the central low

basis weight regions

32 and 33 function as "bending guide regions" for bending the absorbent core 11 in the longitudinal direction at the crotch region 11B. The absorbent core 11 is convexly deformed toward the skin side in the crotch region 11B, so that the convex portions 11t are easily attached along the excretory opening of the wearer and the cleft of the buttocks, and the absorption of excrement can be improved in the crotch region.

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

Here, focusing on the deformation of the absorbent core 11 in the rear side portion 10R, the crotch region 11B is in the following state when the diaper 1 is worn: the absorbent core 11 is deformed into a mountain shape projecting toward the skin of the wearer, and the convex portions 11t are continuous in the vertical direction (the longitudinal direction of the absorbent core 11). If the convex portion 11t is formed continuously over the entire vertical (longitudinal) direction, the convex portion 11t is also formed at the hip position 11C, and therefore the convex portion 11t abuts against the hip of the wearer, and the feeling of the skin at the hip may be deteriorated. In addition, at the waist circumference on the hip side, a gap may be formed between the absorbent core 11 and the skin of the wearer, which may cause leakage of excrement.

In contrast, in the diaper 1 of the present embodiment, the buttocks high basis weight region 55 is provided on the upper side (rear side in the longitudinal direction) in the vertical direction of the rear low basis weight region 39 of the rear side portion 10R so that the absorbent core 11 is not deformed convexly in the region on the upper side (rear side) of the buttocks high basis weight region 55. Specifically, the highly rigid buttock high basis weight region 55 blocks the force that causes the absorbent core 11 to bend and deform so as to bulge toward the skin side in the crotch region 11B from being transmitted to the buttock region 11C. Thus, in the region above (rear side) the hip high basis weight region 55, the central portion in the left-right direction of the absorbent core 11 is restrained from being deformed convexly toward the skin of the wearer, and the absorbent core 11 is raised toward the hip side while maintaining the planar state as shown in fig. 7. In particular, since the central low basis weight region 33, which is a through hole in the rear low basis weight region 39, is a region where the absorbent core 11 has the lowest rigidity and is easily bent, the hip high basis weight region 55 is provided at a position on the upper side in the vertical direction (rear side in the longitudinal direction) of the central low basis weight region 33, and thus the influence of such bending is suppressed from being transmitted to the hip side, and the adhesion can be suppressed from being deteriorated.

Further, when the diaper 1 is worn, the crotch region 11B of the absorbent core 11 is sandwiched between the legs of the wearer, and when the wearer moves the legs forward and backward during walking, forces (shear forces) in opposite directions act on the right side region and the left side region in the left-right direction, and wrinkles and deformation easily occur. However, even if such wrinkles occur in the crotch region 11B, the diaper 1 is less likely to have wrinkles in the region on the rear side of the hip high basis weight region 55.

By providing the hip high basis weight region 55 in this manner, the transmission of the force acting on the absorbent core 11 at the crotch region 11B to the hip region 11C on the rear side of the hip high basis weight region 55 is suppressed. Therefore, the absorbent core 11 is likely to be deformed differently between the crotch region 11B and the hip region 11C through the hip high basis weight region 55, and the fit of each region is improved.

When the absorbent core 11 is deformed, a force acting to compress the absorbent core 11 in the right-left direction in the crotch region 11B concentrates on the 1 st boundary portion 55BF, and the absorbent core 11 largely rises toward the buttocks side from the 1 st boundary portion 55BF as a starting point. As a result, the region of the absorbent core 11 above the hip high basis weight region 55 (the rear side in the longitudinal direction) rises toward the hip of the wearer without undergoing convex deformation as in the crotch portion 11B. Thus, the absorbent core 11 is easily naturally deformed in accordance with the body shape of the wearer.

Further, since the 1 st boundary portion 55BF is inclined from the center in the left-right direction to both outer sides and from the rear side in the longitudinal direction to the front side, the region of the absorbent core 11 on the upper side (rear side in the longitudinal direction) than the hip high basis weight region 55 is inclined along the inclination of the boundary portion and is deformed so as to wrap the hips of the wearer. This improves the fit of the absorbent core 11 to the buttocks of the wearer.

The diaper 1 is provided with a plurality of longitudinal portions 37l in the 2 nd crotch low basis weight region 37 constituting the rear low basis weight region 39. This region is a region where a large force is likely to act by being sandwiched between the legs of the wearer in the crotch region 11B, and is a portion where the absorbent core 11 rises along the roundness of the buttocks of the wearer from the crotch region 11B to the buttocks region 11C. And is a region where wrinkles and the like are likely to occur when the wearer moves his or her legs. Therefore, in the present embodiment, the plurality of longitudinal portions 37l are provided in this region, so that the absorbent core 11 is easily bent and deformed with the longitudinal portions 37l as starting points. This makes the absorbent core 11 easily deform three-dimensionally along the body shape of the wearer in the vicinity of the buttocks. Further, by finely bending and deforming the absorbent core 11, the force to form wrinkles on the surface of the absorbent core 11 is dispersed, and the formation of wrinkles is suppressed, so that a gap between the absorbent core 11 and the body of the wearer can be made less likely to occur.

In the diaper 1, at least a part of the 2 nd crotch low basis weight region 37 (rear low basis weight region 39) overlaps the rear stretchable region 22s of the rear belt portion 22. In fig. 5, the 2 nd crotch low basis weight region 37 and the rear stretchable region 22s overlap each other in a region located on the left-right direction inner side and the up-down direction lower side (front side in the longitudinal direction) than the 1 st boundary portion 55 BF. Therefore, when the diaper 1 is worn, a contraction force in the lateral direction of the rear stretchable region 22s acts on the 2 nd crotch low basis weight region 37 at the overlapped portion. As a result, the absorbent core 11 is easily subjected to contraction deformation in the region sandwiched by the 1 st boundary portion 55BF in the left-right direction, and external forces generated by movements of the legs of the wearer and the like are easily absorbed. Therefore, it is easier to suppress the transmission of force to the hip side.

In the diaper 1, the hip high basis weight region 55 also overlaps the rear stretchable region 22s of the rear belt portion 22. Since the regions having high rigidity, such as the hip high basis weight regions 55, are regions that are substantially difficult to deform and easily maintain a planar shape, it is difficult to fit the regions along the roundness of the hips of the wearer. In contrast, in the present embodiment, the hip high-basis-weight region 55 itself is easily deformed by the contraction force of the rear stretchable region 22 s. Then, by applying a contraction force in the left-right direction from the non-skin side of the hip high basis weight region 55, the hip high basis weight region 55 is pressed against the skin of the wearer. Thus, the hip high basis weight region 55 deforms so as to form a curved surface along the roundness of the hips of the wearer, and is easily brought into close contact with the skin of the wearer, thereby further improving the fit of the absorbent core 11 to the hips.

Further, since at least a part of the 2 nd crotch low basis weight region 37 (rear side low basis weight region 39) overlaps the rear side belt portion 22, the rigidity of the 2 nd crotch low basis weight region 37 on the non-skin side is easily secured at the overlapping portion. Accordingly, when a contraction force in the left-right direction acts on the absorbent core 11, the absorbent core 11 is more likely to bend toward the skin than toward the non-skin side, and therefore the above-described convex deformation is more likely to occur. Further, the 2 nd crotch low basis weight region 37 itself is low in rigidity and therefore can be freely deformed, whereas a plurality of sheet members (213, 214, etc.) are stacked on the rear side belt portion 22 on the non-skin side and have high rigidity, so even when a large force acts on the 2 nd crotch low basis weight region 37 due to the movement of the wearer's legs or the like, the absorbent core 11 can be suppressed from being torn or twisted largely in the 2 nd crotch low basis weight region 37. That is, even when an excessive external force acts on the absorbent core 11, the external force can be buffered by the rear belt section 22, and the breakage of the absorbent core 11 can be suppressed.

In addition, by providing the buttocks low basis weight region 38 at a position on the upper side in the vertical direction (rear side in the longitudinal direction) of the rear side portion 10R of the absorbent core 11 with respect to the buttocks high basis weight region 55, the adhesiveness of the absorbent core 11 can be improved. As described above, since the absorbent core 11 of the present embodiment is deformed in the regions on the upper side (hip side) and the lower side (crotch side) completely differently with the hip high basis weight region 55 interposed therebetween, the absorbent core 11 can be deformed more naturally by providing the low basis weight regions in the respective regions. For example, in the region of the absorbent core 11 above the hip high basis weight region 55, the hip low basis weight region 38 is deformed in a curved shape so as to wrap the hips of the wearer, thereby improving the fit at the hips.

The buttocks low basis weight region 38 has a plurality of longitudinal sections 38l, but as shown in fig. 6, these longitudinal sections 38l are continuously provided from the 2 nd boundary section 55BR to the upper end (rear side end in the longitudinal direction) of the absorbent core 11 in the up-down direction. That is, the lower end position in the vertical direction of the longitudinal portion 38l is an intersection with the 2 nd boundary portion 55BR, and the upper end position in the vertical direction of the longitudinal portion 38l is an intersection with the upper end of the absorbent core 11. By providing the longitudinal sections 38l so as to reach the upper end of the absorbent core 11, the stress applied to the hip high basis weight regions 55 is easily diffused toward the upper end side of the absorbent core 11, and the occurrence of wrinkles and deformation in the absorbent core 11 at the hip positions 11C is easily suppressed. Since the upper end position of the longitudinal section 38l is the same as the upper end position of the absorbent core 11 in the vertical direction, a portion having low basis weight and low rigidity is formed at the upper end edge of the absorbent core 11, and the upper end edge portion is easily deformed flexibly. Therefore, the upper end of the absorbent core 11 is easily deformed in accordance with the waist shape of the wearer on the hip side, and the skin at the waist can be made soft to the touch. The plurality of longitudinal sections 38l need not be all provided so as to reach the upper end of the absorbent core 11, and some of the longitudinal sections 38l may reach the upper end of the absorbent core 11.

In the diaper 1, the 2 nd boundary portion 55BR has a substantially V-shape (U-shape) inclined obliquely downward from the center in the left-right direction toward both outer sides. Therefore, the region of the absorbent core 11 on the upper side (rear side in the longitudinal direction) of the hip high basis weight region 55 is inclined and raised along the inclination of the 2 nd boundary portion 55BR, and a curved surface such as a rounded surface that wraps the hip of the wearer is easily formed.

In addition, the inclination angle of the 2 nd boundary portion 55BR with respect to the left-right direction is smaller than the inclination angle of the 1 st boundary portion 55BF with respect to the left-right direction. Here, the inclination angle with respect to the left-right direction means: in the absorbent core 11 in the extended state as shown in fig. 6, the boundary portions 55BF, 55BR form a small angle with respect to the left-right direction. In fig. 6, the inclination angle θ 55BR of the 2 nd boundary portion 55BR is smaller than the inclination angle θ 55BF of the 1 st boundary portion 55BF (θ 55BR < θ 55 BF).

By increasing the inclination angle θ 55BF at the 1 st boundary portion 55BF near the crotch portion 11B, the amount of deformation of the absorbent core 11 at this boundary portion can be increased. Therefore, the absorbent core 11 that is convexly deformed in the crotch region 11B is easily deformed so as to naturally rise toward the hip region side. On the other hand, in the 2 nd boundary portion 55BR, the deformation amount of the absorbent core 11 is small as compared with the 1 st boundary portion 55BF, and therefore, by decreasing the inclination angle θ 55BR, the absorbent core 11 is easily deformed gently along the roundness of the buttocks.

Further, as shown in fig. 6, the length W55BR of the 2 nd boundary portion 55BR in the left-right direction is longer than the length W55BF of the 1 st boundary portion 55BF in the left-right direction (W55BR > W55 BF). This makes it possible to widen the deformable region of the absorbent core 11 at the 2 nd boundary portion 55BR near the buttocks of the wearer. Therefore, a wide area of the buttocks can be easily covered with the absorbent core 11, and the fit in the buttocks area can be further improved.

In the diaper 1, at least a part of the rear low basis weight region 39 overlaps the crotch stretch region 23 s. By applying the vertical stretchability to the rear low basis weight region 39 of the absorbent core 11 from the non-skin side, the absorbent core 11 is deformed so as to bend along the crotch portion of the wearer in the rear low basis weight region 39. Further, the absorbent core 11 is easily bent toward the skin side, and thus the convex deformation described above is promoted.

Further, a "2 nd hip high basis weight region 56" having a higher basis weight than the rear side low basis weight region 39 and the 1 st crotch low basis weight region 36 is provided between the rear side low basis weight region 39 and the 1 st crotch low basis weight region 36 in the vertical direction. The 2 nd hip high basis weight region 56 is a high basis weight region substantially similar to the hip high basis weight region 55, and is formed continuously in the left-right direction, and the boundary between the rear low basis weight region 39 and the 1 st crotch low basis weight region 36 is a region having a substantially U-shape or V-shape inclined obliquely downward from the center in the left-right direction toward both outer sides. Since the 2 nd hip high basis weight region 56 is provided at a position closer to the crotch region 11B than the hip high basis weight region 55, even when a large force acts on the crotch region 11B by being sandwiched between the legs of the wearer, etc., a part of such a force is reduced in the 2 nd hip high basis weight region 56, and it is easy to suppress transmission of a large force to the hip region 11C. Therefore, the adhesiveness of the absorbent core 11 can be further improved.

Although the embodiments of the present invention have been described above, the above embodiments are intended to facilitate understanding of the present invention and are not intended to limit the present invention. Further, the present invention may be modified and improved without departing from the gist thereof, and it is needless to say that the present invention includes equivalents thereof.

Description of the reference numerals

1 pants-type disposable diaper (diaper, pants-type absorbent article),

1a waist opening, 1b leg opening,

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

11 absorbent core, 11A lower abdomen region, 11B lower crotch region, 11C buttocks region,

11c, a narrowing, 11t,

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

20 an exterior member for a display device, the exterior member having,

21 front side belt part (ventral outer member), 21s front side expansion region,

211 a waist region, 212 a crotch region, 213 a skin side sheet, 214 a non-skin side sheet, 215 a stretch nonwoven fabric,

22 rear side belt part (rear side exterior member), 22s rear side expansion region,

221 waist region, 222 crotch region, 223 skin side sheet, 224 non-skin side sheet, 225 stretch nonwoven,

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

231 a skin side sheet, 232 a non-skin side sheet, 233 a stretch nonwoven fabric,

24 the region of engagement of the end portions,

25a, 25b are welded together,

26 waist elastics, 27 leg elastics, 28 crotch elastics,

32 central low basis weight region, 33 central low basis weight region,

a 36-crotch low basis weight region (1 st-crotch low basis weight region), 36l longitudinal portions, 36w transverse portions,

37 a 2 nd crotch low basis weight region, 37l longitudinal portion, 37w transverse portion,

38 buttocks low basis weight region, 38l lengthwise portion, 38w lengthwise portion,

39 on the back side of the low basis weight region,

40 of the leakage-preventing wall portion,

41 leakage preventing wall elastic member, 42 leakage preventing wall elastic member,

55 buttocks high basis weight region, 55BF 1 st boundary portion, 55BR 2 nd boundary portion,

56 a 2 nd hip high basis weight region,

the CL specifies the position of the lens,

theta 55BF is inclined at an angle, and theta 55BR is inclined at an angle.

Claims

1. A pants-type absorbent article having a vertical direction, a horizontal direction, and a front-rear direction that intersect with each other, the pants-type absorbent article having an absorbent main body that has an absorbent core disposed along the vertical direction and is folded back and forth at a lower end portion in the vertical direction, the pants-type absorbent article being characterized in that,

the absorbent core has a rear side portion which is a portion bent toward the rear side in the front-rear direction,

the absorbent core has, at the rear side portion:

a rear low basis weight region having a lower average basis weight than the surrounding regions; and

a 1 st hip high basis weight region which is provided at a position higher than the rear low basis weight region in the vertical direction and has a higher average basis weight than the rear low basis weight region,

at least a part of the boundary between the rear low basis weight region and the 1 st hip high basis weight region is inclined obliquely downward from the center in the left-right direction toward both outer sides,

the rear low basis weight region has a plurality of longitudinal portions extending in the vertical direction and a central low basis weight region provided in a central portion in the horizontal direction,

the boundary portion is a line continuously connecting the upper end in the vertical direction of the longitudinal portion and the upper end in the vertical direction of the central low basis weight region,

the absorbent core has a buttocks low basis weight region having a lower average basis weight than the surrounding region at a position on the upper side of the 1 st buttocks high basis weight region in the rear side portion,

at least a part of the boundary between the 1 st hip high basis weight region and the hip low basis weight region is inclined obliquely downward from the center in the left-right direction toward both outer sides,

the hip low basis weight region has a plurality of longitudinal portions along the up-down direction,

the boundary between the 1 st hip high basis weight region and the hip low basis weight region is a line continuously connecting the lower ends in the vertical direction of the plurality of longitudinal portions of the hip low basis weight region.

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

the pants-type absorbent article has a rear side belt portion having a rear side stretchable region stretchable in the left-right direction and connected to the absorbent main body,

the upper side end of the central low basis weight region and the upper side ends of all the longitudinal portions provided in the rear low basis weight region overlap with the rear belt portion in the front-rear direction,

the lower side ends of all the longitudinal portions provided in the hip low basis weight region overlap the rear side belt portion in the front-rear direction,

the 1 st hip high basis weight region overlaps the rear side belt portion in the front-rear direction.

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

at least a part of the rear side low basis weight region overlaps with the rear side stretchable region in the up-down direction.

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

the 1 st hip high basis weight region overlaps with the rear stretchable region in the up-down direction.

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

at least a portion of the rear low basis weight region overlaps the rear belt portion in the up-down direction.

6. A pant-type absorbent article according to any one of claims 1 to 5,

the smaller angle of the angles of the boundary portions of the rear low basis weight region and the 1 st hip high basis weight region with respect to the left-right direction is larger than the smaller angle of the angles of the boundary portions of the 1 st hip high basis weight region and the hip low basis weight region with respect to the left-right direction.

7. A pant-type absorbent article according to any one of claims 1 to 5,

the length of the boundary portion between the 1 st hip high basis weight region and the hip low basis weight region in the left-right direction is longer than the length of the boundary portion between the rear side low basis weight region and the 1 st hip high basis weight region in the left-right direction.

8. A pant-type absorbent article according to any one of claims 1 to 5,

in the up-down direction, an upper end position of at least a part of the longitudinal portion of the hip low basis weight region is the same as an upper end position of the absorbent core.

9. A pant-type absorbent article according to any one of claims 1 to 5,

the rear low basis weight region has a plurality of transverse portions intersecting the longitudinal portions in addition to the longitudinal portions.

10. A pant-type absorbent article according to any one of claims 1 to 5,

the pants-type absorbent article has a crotch member which is layered on the non-skin side of the absorbent core and has a crotch stretch region which stretches in the vertical direction, in a crotch portion located in the crotch of the wearer when worn,

at least a part of the rear side low basis weight region overlaps with the crotch stretch region.

11. A pant-type absorbent article according to any one of claims 1 to 5,

the central low basis weight region penetrates the absorbent core in a thickness direction.

12. A pant-type absorbent article according to any one of claims 1 to 5,

a 2 nd hip high basis weight region is provided on the rear side low basis weight region of the rear side portion at a lower side in the vertical direction, and an average basis weight of the 2 nd hip high basis weight region is higher than that of the rear side low basis weight region.