WO2019131008A1

WO2019131008A1 - Pants-type absorbent article

Info

Publication number: WO2019131008A1
Application number: PCT/JP2018/044490
Authority: WO
Inventors: 賢一笹山; 大西　和彰; 圭村上; 唯永山; 大貴近藤
Original assignee: ユニ・チャーム株式会社
Priority date: 2017-12-28
Filing date: 2018-12-04
Publication date: 2019-07-04
Also published as: JP2019118557A; CN111447903A; JP6600677B2; TWI693065B; TW201932084A; CN111447903B

Abstract

A pants-type absorbent article (1) which includes an absorbent body (10) that is provided with an absorbent core (11) arranged along the vertical direction and that is folded at a lower end in the vertical direction to form a front side and a rear side, wherein the absorbent core (11) has a rear portion (10R), which is the portion folded to the rear side in the front-rear direction, and the absorbent core (11) has, in the rear portion (10R), a rear low basis weight region (39) which has an average basis weight that is lower than the surrounding regions and a buttocks high basis weight region (55) which is provided more toward the top in the vertical direction than the rear low basis weight region (39) and which has an average basis weight that is higher than the rear low basis weight region (39), and at least a portion of a boundary portion (55BF) between the rear low basis weight region (39) and the buttocks high basis weight region (55) inclines diagonally downward toward opposite outer sides from the center in the right direction.

Description

Pants-type absorbent article

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

The pant-type absorbent article has an absorbent core that absorbs excrement fluid such as urine. Then, by providing slits or the like in a partial region of the absorbent core to lower the rigidity, the absorbent core is easily bent in the low rigidity portion when the pants-type absorbent article is worn, and the wearer's body is Techniques for facilitating three-dimensional deformation along the line are known. For example, in Patent Document 1, the absorbent core is divided in the longitudinal direction into three regions of a ventral side, an intermediate portion, and a back side, and groove-like concave portions are provided in the respective regions. An absorbent article is disclosed which is connected to one another.

JP 2012-143535 A

In the absorbent article of Patent Document 1, the fit may be deteriorated because the recesses of the middle portion and the back side are connected to each other while the absorber is easily deformed. For example, the deformation of the middle recess, which is the starting point of the bending of the absorbent core in the crotch of the wearer, induces the deformation of the back recess and of the absorbent core along the buttocks shape on the back of the wearer There is a risk that deformation will not occur easily. Also, when the wearer walks, when the legs move back and forth, forces in opposite directions (forward and backward) act on both sides in the width direction of the absorbent core in the crotch (middle part), When the force in the opposite direction is transmitted to the dorsal side, there is a risk that wrinkles may easily occur at the heel site. Therefore, in an absorbent article like patent documents 1, there is a possibility that fit nature and touch may deteriorate in a crotch or crotch.

The present invention has been made in view of the above problems, and an object thereof is to provide a pants-type absorbent article which can realize a good fit in the crotch and buttocks of the absorbent core. It is to do.

The main invention for achieving the above object has an absorbent core which has vertical directions, horizontal directions, and front-rear directions which cross each other, and is arranged along the vertical directions, and the lower end in the vertical direction. A pant-type absorbent article having an absorbent main body folded back and forth, wherein the absorbent core has a back side portion which is a portion folded back on the back and forth direction, the absorbent core The rear side is provided with a rear low basic weight area whose average basis weight is lower than that of the surrounding area, and the upper side above the rear low basic weight area in the vertical direction, the rear side And a ridged area having a higher average basis weight than a low basis weight area, and at least a part of a boundary between the rear low basis weight area and the ridged area high basis weight area That it is inclined diagonally downward from the center in the left-right direction toward both sides, It is a pants-type absorbent article and butterflies.
Other features of the present invention will be apparent from the description of the present specification and the accompanying drawings.

ADVANTAGE OF THE INVENTION According to this invention, the pants-type absorbent article which can implement | achieve a favorable fit in the crotch part and buttocks of an absorbent core can be provided.

FIG. 1 is a perspective view of a shorts-type disposable diaper 1; It is the schematic plan view which looked at the diaper 1 of the expansion | deployment and the expansion | extension state from the non-skin side. It is a schematic sectional drawing in the II line of FIG. FIG. 4A is a schematic plan view of the absorbent main body 10 in the unfolded and stretched state as viewed from the skin side. FIG. 4B is a cross-sectional view taken along line AA of FIG. 4A. FIG. 2 is a schematic plan view of the diaper 1 in an unfolded and stretched state, illustrating the positional relationship between various stretchable regions (21s, 22s, 23s) and the absorbent core 11. It is the top view which looked at the absorptive core 11 from the skin side. It is a schematic perspective view explaining the modification of absorptive core 11 at the time of diaper 1 wear.

At least the following matters will be made clear by the present specification and the description of the accompanying drawings.
It has an absorptive core which has the up-down direction which intersects mutually, left-right direction, and the front-back direction, is arranged along the up-down direction, and has an absorptive main body bent back and forth at the lower end part of the up-down direction. A pant-type absorbent article, wherein the absorbent core has a back side portion which is a portion bent back on the front and rear direction, and the absorbent core is a peripheral region on the back side. A lower low basis weight area having an average basis weight lower than that of the lower basis weight area and an upper side in the vertical direction above the rear side low basis weight area, and an average basis weight is higher than the rear side low basis weight region And at least a part of the boundary between the rear low basis weight area and the buttock high basis weight area is diagonally directed from the center in the left-right direction toward both outer sides A pants-type absorbent article characterized in that it is inclined downward.

According to such a pants-type absorbent article, it is suppressed by the buttocks high basis weight region that the force for compressing the absorbent core in the left-right direction is transmitted from the crotch to the buttocks side. In addition, the absorbent core rises obliquely along the boundary between the rear low basis weight area and the buttocks high basis weight area, and is deformed so as to wrap the buttocks of the wearer. Thereby, the fit of the absorbent core can be improved in the region extending from the crotch to the buttocks.

In the pants-type absorbent article, it is preferable that the rear low basis weight region has a longitudinally long portion along the vertical direction.

According to such a pants-type absorbent article, in the region extending from the crotch to the buttocks, the absorbent core is likely to be bent and deformed starting from the longitudinally long portion. As a result, the absorbent core is likely to be three-dimensionally deformed along the shape of the wearer's crotch to the vicinity of the buttocks.

The pants-type absorbent article is provided with a rear side stretchable region that stretches in the left-right direction, and has a rear side belt portion connected to the absorbent main body, and the rear side low basis weight in the vertical direction It is desirable that at least a part of the area overlaps with the rear elastic area.

According to such a pants-type absorbent article, in the portion overlapping with the rear side stretchable area, the contraction force in the left-right direction acts on the rear side low basis weight area. As a result, the absorbent core is easily contracted and deformed in the overlapping portion, and the external force generated by the movement of the leg of the wearer is easily buffered. Therefore, the fit of the absorbent core is further improved.

In the pants-type absorbent article, it is preferable that the buttocks high basis weight region overlaps the rear elastic region in the vertical direction.

According to such a pant-type absorbent article, the highly rigid buttocks-high basis weight region is easily deformed by applying a contraction force by the rear side stretchable region. In addition, when the contraction force acts from the non-skin side, the buttock high basis weight region is pressed to the skin side of the wearer. Therefore, while the buttocks high basis weight area deforms so as to form a curved surface along the roundness of the buttocks of the wearer, it becomes easy to adhere to the wearer's skin, and the fit of the absorbent core can be further improved.

The pants-type absorbent article is provided with a rear side stretchable region that stretches in the left-right direction, and has a rear side belt portion connected to the absorbent main body, and the rear side low basis weight in the vertical direction Preferably, at least a portion of the area overlaps the rear belt portion.

According to such a pants-type absorbent article, the rigidity on the non-skin side of the rear low basis weight region is likely to be secured in the portion overlapping the rear belt portion. Therefore, the absorbent core is more likely to be bent to the skin side than the non-skin side, and even if an excessive external force acts on the rear low basis weight region, the external belt is buffered by the rear belt portion and absorbed. It can control that a sex core is damaged.

In such a pants-type absorbent article, the absorbent core has a lower basis weight in the rear side portion, in which the average basis weight is lower than the surrounding area on the upper side than the basis area of the buttocks. It is desirable to have an area.

According to such a pants-type absorbent article, the low basis weight regions are provided on the upper side (the buttocks side) and the lower side (the crotch side) across the buttocks high basis weight region, so that each region The absorbent core can be more easily deformed naturally.

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

According to such a pants-type absorbent article, the region above the buttocks / high basis weight area of the absorbent core rises obliquely along the slope of the boundary, and wraps the roundness of the buttocks of the wearer It becomes easy to form such a curved surface.

Such a pants-type absorbent article, wherein the smaller one of the angles formed by the boundary between the rear low basis weight area and the buttocks high basis weight area with respect to the left-right direction is the buttocks high basis weight It is desirable that the boundary between the area and the buttock low basis weight area is larger than the smaller one of the angles formed with respect to the lateral 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 closer to the crotch, and bending deformation of the absorbent core occurs. It will be easier. On the other hand, at the boundary portion closer to the buttocks, the absorbent core is easily deformed gently along the roundness of the buttocks by reducing the inclination angle.

Such a pants-type absorbent article, wherein the length of the boundary between the buttocks high basis weight area and the buttocks low basis weight area in the left and right direction is the back low basis weight area in the left and right direction It is desirable that the length is longer than the length of the boundary with the buttocks / high basis weight region.

According to such a pants-type absorbent article, it is possible to make the area where the absorbent core can be deformed wider at the boundary near the buttocks of the wearer. Therefore, the wide area of the buttocks is easily covered by the absorbent core, and the fit can be further improved.

In the pants-type absorbent article, the buttocks low basis weight region has a plurality of longitudinally long portions along the vertical direction, and in the vertical direction, the upper end position of at least a part of the longitudinally long portions; It is desirable that the upper end position of the absorbent core is the same.

According to such a pants-type absorbent article, the upper end edge of the absorbent core is formed with a portion having a low basis weight and low rigidity, so that the upper end edge portion is easily deformed flexibly. Therefore, the upper end portion of the absorbent core can be easily deformed in accordance with the waist curve on the buttocks side of the wearer, and the skin feel can be softened.

In the pants-type absorbent article, it is preferable that the rear low basis weight region has a longitudinally long portion along the vertical direction and a plurality of horizontally long portions intersecting the longitudinally long portion.

According to such a pant-type absorbent article, by providing the longitudinally long portion extending along the vertical direction and the horizontally long portion extending along the left and right direction to cross each other, the absorbent core is further cut at the crotch. It can be made flexible and easy to deform.

Such a pants-type absorbent article, which is laminated on the non-skin side of the absorbent core at the crotch located on the crotch of the wearer when worn, and has a crotch elastic region which stretches in the vertical direction. It is desirable that a member be provided, and at least a part of the rear low basis weight region overlap the crotch elastic region.

According to such a pants-type absorbent article, the stretchability in the vertical direction from the non-skin side acts on the rear low basis weight region of the absorbent core, thereby, in the rear low basis weight region, The absorbent core deforms to curve along the crotch of the wearer. In addition, since the absorbent core is easily bent to the skin side, deformation along the body shape of the wearer is promoted.

In the pants-type absorbent article, the absorbent core is disposed along the vertical direction at the rear side, below the vertical direction of the buttocks high basis weight area and at the center of the horizontal direction. Preferably, a central low basis weight area is provided through the

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 extends in the vertical direction starting from the central low basis weight area having the lowest rigidity. It is easy to bend and deform so that it has a convex shape on the skin side. This makes it easier for the absorbent core to fit along the crevices of the wearer's void and buttocks.

In the pants-type absorbent article, the average basis weight is higher on the lower side in the up-down direction of the rear low basis weight region in the rear side portion than in the rear low basis weight region. It is desirable that a second ridge high basis weight area be provided.

According to such a pants-type absorbent article, even when a large force acts on the absorbent core in the crotch region, part of such a force is relieved in the second heel high basis weight region, It becomes easy to control that big power is transmitted from the crotch side to the buttocks side. This makes it possible to further improve the fit of the absorbent core.

=== Embodiments ===
Hereinafter, as a "pants type absorbent article" of the present invention, an embodiment will be described by taking a pants type disposable diaper 1 for adults (hereinafter also referred to as "diaper 1") as an example. However, the pants-type absorbent article of the present invention can also be used as, for example, disposable diapers for children, sanitary products (shorts-type napkins), and the like.
<< Whole composition of diaper 1 >>
FIG. 1 is a schematic perspective view of the diaper 1. FIG. 2 is a schematic plan view of the unfolded and stretched diaper 1 as viewed from the non-skin side. FIG. 3 is a schematic cross-sectional view taken along line II of FIG. The “extended state” of the diaper 1 refers to a state in which the diaper 1 is extended without wrinkles, and the dimensions of the members constituting the diaper 1 (for example, the exterior member 20 described later) match the dimensions of the single member Or, it is in a state of being stretched to a length close to that.

The diaper 1 has an up-down direction, a left-right direction, and a front-back direction intersecting with each other, and has a thickness direction in which the respective members are laminated as shown in FIG. 3. In the vertical direction, the side on the trunk side of the wearer is the upper side, and the side on the crotch of the wearer is the lower side. In the front-rear direction, the front side of the wearer is referred to as the front side, and the back side of the wearer is referred to as the back side. In the thickness direction, the side in contact with the body of the wearer is the skin side, and the other side is the non-skin side. Moreover, in the unfolded state of FIG. 2, the diaper 1 has the longitudinal direction and width direction which mutually cross | intersect. The longitudinal direction is a direction along the vertical direction, and the width direction is the same as the lateral direction.

The diaper 1 has the absorptive main body 10 which is rectangular shape planar view, and the exterior member 20 located in the non-skin side of the absorptive main body 10. As shown in FIG. The exterior member 20 includes a belly-side exterior member 21 (front belt portion 21) positioned on the front side in the front-rear direction in FIG. 1 and a back-side exterior member 22 (rear belt portion 22) positioned on the rear side in the front-rear direction. And a crotch exterior member 23 (crotch member 23) connecting them. The above members adjacent in the thickness direction are joined by an adhesive or the like.

Further, the front side belt portion 21 is positioned at one end side in the longitudinal direction of the absorbent main body 10, and the rear side belt portion 22 is positioned 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 on which the front belt portion 21 is positioned is referred to as the front side, and the side on which the rear belt portion 22 is positioned is referred to as the rear side. That is, the front side belt portion 21 is located at the front upper end portion of the absorbent main body 10, and the rear side belt portion 22 is located at the rear upper end portion of the absorbent main body 10. Further, the crotch member 23 is positioned closer to the skin than the front side belt portion 21 and the rear side belt portion 22.

In addition, although the exterior member 20 is comprised by three members in the diapar 1 of this embodiment, it does not restrict to this. For example, the front belt portion 21, the rear belt portion 22, and the crotch member 23 may be one member. In addition, a configuration without the crotch member 23 or a configuration in which a member different from the exterior member 20 is further laminated on the non-skin side of the exterior member 20 may be used.

In the diaper 1 in the unfolded state shown in FIG. 2, the absorbent main body 10 is folded back and forth at a predetermined position CL in the longitudinal direction, and both sides in the lateral direction of the front belt portion 21 and both sides in the lateral direction of the rear belt portion 22 The parts are joined by welding or the like to form the pants-type shown in FIG. That is, the longitudinal direction of the absorbent main body 10 is along the vertical direction of the diaper 1, and the front belt portion 21 and the rear belt portion 22 are annularly connected to form the waist opening 1a and the pair of leg openings 1b. . Hereinafter, a region where the front belt portion 21 and the rear belt portion 22 are joined is referred to as an end joint region 24.

Further, in the present specification, of the absorbent main body 10 (absorbent core 11) bent at the predetermined position CL, a portion bent to the front side is referred to as “front side portion 10F”, and a portion bent to the rear side It is referred to as "the rear side 10R". That is, in the longitudinal direction of FIG. 2, the area on the front side of the predetermined position CL of the absorbent main body 10 (absorbent core) 11 is called “front side 10 F”, and the area on the rear side of the predetermined position CL is “rear side It may be called "part 10R".

As shown in FIG. 3, the absorbent main body 10 includes an absorbent core 11, a top sheet 12 positioned on the skin side of the absorbent core 11, and a back sheet 13 positioned on the non-skin side of the absorbent core 11. Have. FIG. 4A is a schematic plan view of the absorbent main body 10 in the unfolded and stretched state as viewed from the skin side. FIG. 4B is a cross-sectional view taken along line AA of FIG. 4A. In FIG. 4B, the low basis weight region (described later) provided in the absorbent core 11 is not displayed for simplification of the description.

The absorbent core 11 is a member that absorbs and holds excretory fluid such as urine, and is formed of, for example, a liquid absorbent fiber such as pulp fiber mixed with a superabsorbent polymer (SAP). The absorbent core 11 of the present embodiment has a narrowed portion 11 c having a narrow width in the left-right direction between the front end and the rear end in the longitudinal direction, and the plan view as shown in FIG. 4A It has a substantially hourglass shape. In addition, various low basis weight regions, which are regions in which the basis weight is lower than that of the surrounding, are formed in the absorbent core 11. Details of the low basis weight region will be described later. In addition, the outer peripheral surface of the absorbent core 11 may be covered by a liquid-permeable sheet such as tissue paper or non-woven fabric.

The top sheet 12 is a liquid-permeable sheet, and for example, a hydrophilic air through non-woven fabric or a spun-bonded non-woven fabric 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. As the liquid impermeable sheet 13a, for example, a resin film or the like is used, and as the hydrophobic sheet 13b, for example, a hydrophobic non-woven fabric having flexibility is used. The back sheet 13 may have a single layer structure of the liquid impermeable sheet 13a.

Side sheets 14 are provided on both sides of the back sheet 13 in the left-right direction. The side sheet 14 extends outward in the left-right direction from both ends 11 es, 11 es in the left-right direction of the absorbent core 11, and with the both ends 10 es, 10 es in the left-right direction of the absorbent main body 10 folded back A pair of leakproof walls 40 are formed by being folded back to the skin side in the longitudinal direction. Leakproof wall

elastic members

41 and 42 such as thread rubber are fixed to the leakproof wall portion 40 in a state of being extended along the longitudinal direction (vertical direction) of the absorbent main body 10. When the leak preventing wall

elastic members

41 and 42 are contracted in the longitudinal direction, the pair of leak preventing wall portions 40 stand up on the skin side at both ends in the left and right direction of the absorbent main body 10 and function as a leak preventing wall of the diaper 1 Do. Alternatively, the leakproof wall portion 40 may be formed by extending the back sheet 13 (liquid permeable sheet 13 b) to the outside in the left-right direction of the absorbent core 11 without providing the side sheet 14. .

The front side belt portion 21 and the rear side belt portion 22 are, as shown in FIG. 2, respectively, in a

waistline area

211, 221 where the end joint area 24 is located in the vertical direction and a lower side than the

waistline area

211, 221 The

crotch region

212, 222 is provided. The

waistline regions

211 and 221 have a rectangular shape in plan view. The

crotch region

212, 222 has a substantially trapezoidal shape, and the outer edge portion has inclined

portions

212s, 222s that are inclined inward in the left-right direction toward the lower side in the up-down direction. That is, the

crotch region

212, 222 has a narrower width toward the lower side. Further, in the present embodiment, the crotch-side region 222 of the rear belt portion 22 is larger than the crotch-side region 221 of the front belt portion 21, and can widely cover the buttocks of the wearer.

The front side belt portion 21 and the rear side belt portion 22 are, as shown in FIG. 3, respectively,

skin side sheets

213 and 223 located on the skin side, and

non-skin side sheets

214 and 224 located on the non-skin side. It has an

elastic nonwoven fabric

215, 225 which is located between them and has elasticity at least in the left-right 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 for example, a spunbond nonwoven fabric or an SMS nonwoven fabric is used.

The stretchable

non-woven fabric

215, 225 has, for example, a polyurethane elastomer which is a thermoplastic elastomer fiber having elasticity, and a polypropylene (PP) of a polyolefin resin which is a thermoplastic resin fiber having non-elasticity. And non-woven fabric that has been subjected to an appropriate stretching process such as gear stretching. By this stretching process, the stretchable

nonwoven fabrics

215, 225 have stretchability in a predetermined direction. The stretching may be performed in directions orthogonal to each other, or may be performed only in a predetermined direction. When stretching is performed only in a predetermined direction, stretchability in a predetermined direction is developed, but all fibers are not necessarily oriented along the predetermined direction, so stretchability in the direction orthogonal to the predetermined direction is also possible. Is expressed.

The

skin side sheets

213 and 223, the

non-skin side sheets

214 and 224, and the stretchable

non-woven fabric

215 and 225 are joined by a plurality of

scattered portions

25a and 25b (for example, a region to which ultrasonic welding is performed) For example, compared with the case where it joins by the adhesive which hardens | cures, the touch is softened. In addition, the elastic

non-woven fabric

215, 225 shrinks between the welded

portions

25a, 25b, causing the

skin side sheets

213, 223 and the

non-skin side sheets

214, 224 to curve and protrude outward in the thickness direction. Do. That is, since the

skin side sheets

213 and 223 and the

non-skin side sheets

214 and 224 swell between the welded

portions

25a and 25b, the touch becomes softer and it is possible to give the user a visually soft impression.

With such a configuration, the front belt portion 21 and the rear belt portion 22 have stretchability in the left-right direction (and the vertical direction) of the diaper 1 as a whole. An area in the front belt portion 21 that exhibits elasticity in the left-right direction is referred to as a front elastic area 21s, and an area in the rear belt unit 22 that expresses elasticity in the left-right direction is referred to as a rear elastic area 22s (see FIG. See the shaded area of 5). Moreover, welding

part

25a, 25b is dotted at comparatively narrow intervals as shown in FIG. Therefore, in the diaper 1 of this embodiment, since it extends in many directions and fine swelling (wrinkle) occurs, and generation of one-way wrinkles (longitudinal wrinkle etc.) peculiar to the diaper can be prevented. Aesthetic is good.

In addition, you may use an elastic film instead of the elastic nonwoven fabric 215,225. However, since the thickness of the stretchable film is substantially uniform, the swelling of the

skin side sheets

213 and 223 and the

non-skin side sheets

214 and 224 between the welded

portions

25a and 25b is easily crushed. On the other hand, since the thickness of the stretchable

non-woven fabric

215, 225 is increased between the welded

portions

25a, 25b, the swelling of the

skin side sheets

213, 223 and the

non-skin side sheets

214, 224 is hardly crushed, and the softness and beauty of the touch You can keep the sex.

Further, in the area where the welded

portions

25a and 25b are scattered, the welded

portions

25a and 25b are formed in the first dotted area X overlapping in the thickness direction with the absorbent main body 10 and the second dotted area Y other than that. Alternatively, the ratio of the welded

portions

25a and 25b per unit area may be made different. In FIG. 2, in the first scattered region X, substantially rectangular welds 25a inclined 45 degrees or -45 degrees with respect to the left-right direction are alternately arranged. On the other hand, in the second dotted area Y, circular welds 25b are arranged in a zigzag.

Further, the area of the welded portion 25b per unit area is smaller in the second dotted area Y than in the first dotted area X. Therefore, in the

waistline regions

211 and 221 where problems such as sweat and stuffy are likely to occur, it is possible to suppress the air permeability from being hindered by the welded portion 25 b, and it is possible to ensure appropriate air permeability. On the other hand, in the first dotted region X overlapping the absorbent main body 10, the contraction of the front belt portion 21 and the rear belt portion 22 can be appropriately suppressed, and the contraction of the absorbent main body 10 in the left-right direction can be reduced.

Further, in the front belt portion 21 and the rear belt portion 22, a plurality of waist elastic members 26 such as thread rubber are disposed in a region along the waist opening 1a. Similarly, a plurality of leg elastics 27 such as thread rubber are disposed in a region along the leg openings 1b. That is, since the waist elastic members 26 and the leg elastic members 27 firmly adhere to the body of the wearer by the waist elastic members 26 and the leg elastics 27, the diaper 1 can be prevented from slipping off or leaking from the legs. On the other hand, since the other portions gently fit the wearer's body over the entire surface by the stretchable

nonwoven fabric

215, 225, the feeling of tightening is reduced.

The crotch member 23 has a substantially hourglass shape in plan view curved inward in the left-right direction at a central portion in the longitudinal direction. Further, as shown in FIG. 3, the crotch member 23 is positioned between the skin side sheet 231 located on the skin side and the non-skin side sheet 232 located on the non-skin side, and the up-down direction of the diaper 1. The stretchable non-woven fabric 233 which imparts stretchability to (the longitudinal direction of the absorbent main body 10) is provided. These sheets 231 to 233 are joined by a plurality of welds (for example, welds 25b similar to the second dotted area Y). In the crotch member 23, a region in which stretchability along the up and down direction is expressed is taken as a crotch stretch region 23s (see the hatched portion in FIG. 5).

By providing the inseam elastic region 23s, the absorbent core 11 can be in close contact with the crotch of the wearer, and the drooping of the diaper 1 can be suppressed even if the weight of the absorbent core 11 increases due to excretion. A plurality of crotch elastic members 28 are disposed in a region along the leg opening 1b of the crotch member 23, and the crotch member 23 is in close contact with the wearer's leg.

<< On deformation of absorbent core 11 >>
When wearing the diapar 1, according to a motion of a wearer's body, a mode that an absorptive core 11 (absorbent main part 10) deform | transforms is demonstrated.

FIG. 5 is a schematic plan view of the diaper 1 in the unfolded and stretched state, and illustrates the positional relationship between the various stretchable regions (21s, 22s, 23s) and the absorbent core 11. As shown in FIG. FIG. 6 is a plan view of the absorbent core 11 as viewed from the skin side.

As shown in FIG. 5, the absorbent core 11 includes “lower abdomen position 11A” located in the lower abdomen of the wearer when worn, “crotch site 11B” located in the crotch region of the wearer, and the buttocks of the wearer And “the heel region 11C” located at In FIG. 5, the portion overlapping the front belt portion 21 is a lower abdomen position 11A, the portion overlapping the rear belt portion 22 is a heel portion 11C, and the in-between portion is a crotch portion 11B. That is, the lower abdomen position 11A is a portion located on the front side portion 10F of the diaper 1, and the heel portion 11C is a portion located on the back side portion 10R of the diaper 1. The crotch region 11B is located at the lower end in the vertical direction of the diaper 1, and is a region provided over the front position 10F and the rear side 10R across the predetermined position CL.

However, the range of "crotch region 11B" shown in FIG. 5 is an example, and is not limited to this. For example, even when the area from the lower end of the end joint area 24 of the front belt portion 21 to the lower end of the end joint area 24 of the rear belt portion 22 in the longitudinal direction is 1/3, good.

The absorbent core 11 has a “crotch low basis weight region 36” which is a region in which the basis weight of the absorbent core 11 is lower than that of the periphery at the crotch region 11B. The crotch low basis weight region 36 is formed by the intersection of a vertically long portion 36l along the vertical direction (longitudinal direction of the absorbent core) and a horizontally long portion 36w along the lateral direction (width direction of the absorbent core). ing. A plurality of vertically long portions 36l are provided at intervals in the left-right direction at the crotch region 11B, and a plurality of horizontally long portions 36w are provided at intervals in the vertical direction on each of the vertically long portions 36l.

In addition, "basis weight" of the absorptive core 11 is mass (g / m < ² >) of the absorptive core 11 (for example, liquid absorptive fiber which SAP mixed) per unit area. The comparison of the basis weight of the absorbent core 11 between the inseam low basis weight region 36 and the periphery may be performed by a known method. For example, there is a method of comparing visually. In addition, there is a method in which the target site is cut out from the absorbent core 11 as a sample, the 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 the other low basis weight regions described below.

The absorbent core 11 is easily bent starting from the crotch low basis weight region 36 due to the difference in rigidity between the crotch low basis weight region 36 and the periphery. Therefore, when the diaper 1 is worn, the absorbent core 11 is easily deformed to conform to the unevenness of the wearer's body by bending from the crotch low basis weight region 36, and it becomes easy to fit the wearer's body . In particular, the crotch region 11 </ b> B is a region that is susceptible to compressive force in the left-right direction by being sandwiched between the legs of the wearer when the diaper 1 is worn. Therefore, in the crotch region 11B, the absorbent core 11 is more easily deformed by providing the longitudinally long portion 36l extending along the vertical direction and the horizontally long portion 36w extending along the lateral direction so as to intersect with each other. Can.

Further, as shown in FIG. 6, the absorbent core 11 is more absorbent than the crotch low basis weight region 36 on the upper side in the vertical direction and on the rear side (rear side portion 10R) in the front and rear direction as compared to the surroundings. It has a “second crotch low basis weight region 37” which is a region where the basis weight of the core 11 is lowered. The second inseam low basis weight area 37 has substantially the same configuration as the inseam low basis weight area 36, and the vertically long portion 37l along the vertical direction (longitudinal direction of the absorbent core) and the left and right direction (absorbent) A plurality of laterally long portions 37w along the width direction of the core are formed to intersect with each other. The second crotch low basis weight region 37 is disposed across the crotch region 11B and the heel region 11C. In addition, in order to distinguish between the inseam low basis weight region 36 and the second inseam low basis weight region 37 described above, in the following, the inseam low basis weight region 36 may be referred to as a "first inseam low basis weight region 36" is there.

In addition, the absorbent core 11 is an upper side in the vertical direction above the first crotch low basis weight region 36 and a front side (front side portion 10F) in the front-rear direction, and a longitudinally long portion 37l of the second crotch low basis weight region 37 Between the left and right direction, there is a "central low basis weight region 32" which is a region where the basis weight of the absorbent core 11 is lower than that of the surrounding. The central low basis weight region 32 is disposed along the vertical direction (longitudinal direction of the absorbent core 11) at the central portion in the left and right direction of the absorbent core 11, has a lower basis weight than the surroundings, and is lower than the lateral direction. It is a substantially rectangular area which is long in the vertical direction. Similarly, at the center in the left-right direction on the upper side in the vertical direction above the crotch low basis weight region 36 and on the rear side (rear side portion 10R) in the front-rear direction, a “center corresponding to the central low basis weight region 32 A low basis weight area 33 "is provided. In the present embodiment, it is assumed that the absorbent core 11 does not exist in the central low

basis weight regions

32 and 33. That is, the central low

basis weight regions

32, 33 are holes through which the absorbent core 11 penetrates in the thickness direction.

Of these low basis weight regions (32, 33, 36, 37), the second crotch low basis weight region 37 (not provided on the front side portion 10F) provided on the rear side 10R and the central low basis weight The area | region 33 is put together and it is set as "the back side low basis weight area | region 39" (refer FIG. 6).

In the rear side 10R of the absorbent main body 10, the second crotch low basis weight region 37 (and the center low basis weight) is on the upper side (rear side in the longitudinal direction) above and below the rear side low basis weight region 39. There is provided “a buttock high basis weight region 55” whose basis weight is higher than the region 33). The buttocks high basis weight region 55 is a region continuous in the left and right direction, and the boundary between the rear low basis weight region 39 and the buttocks high basis weight region 55 is diagonally downward from the center in the left and right direction It is inclined in the direction. Accordingly, the buttock high basis weight area 55 is an area having a substantially U-shaped or V-shaped shape as shown in FIG. The “boundary” between the rear low basis weight region 39 and the buttocks high basis weight region 55 is the upper end (the rear end in the longitudinal direction) of the vertically long portion 37 l of the second crotch low basis weight region 37. Also, it is a line (curve) continuously connecting the upper end in the vertical direction of the central low basis weight area 33 (rear end in the longitudinal direction), and is indicated by a broken line in FIG. Hereinafter, the boundary between the rear low basis weight region 39 and the buttocks high basis weight region 55 is also referred to as "first boundary portion 55BF".

The “basis weight” of the rear low basis weight area 39 is the average basis weight of the area surrounded by the vertically elongated portions 37l arranged at both ends in the left and right direction in FIG. Say. Similarly, the basis weight of the buttock high basis weight area 55 refers to the average basis weight of the area sandwiched between the rear low basis weight area 39 and the buttock low basis weight area 38 (described later).

Furthermore, in the rear side 10R of the absorbent main body 10, the basis weight of the absorbent core 11 is lower on the upper side (rear side in the longitudinal direction) in the vertical direction than the buttocks high basis weight region 55 compared to the surroundings. There is provided a "hip portion low basis weight area 38" which is an area. The buttock low basis weight area 38 has substantially the same configuration as the second crotch low basis weight area 37, and has a laterally long portion 38w extending vertically.

The boundary between the buttock high basis weight region 55 and the buttock low basis weight region 38 is inclined obliquely downward from the center in the left-right direction toward the outside. The “boundary” between the buttock high basis weight area 55 and the buttock low basis weight area 38 continuously connects the vertically lower end (longitudinal front end) of the vertically long portion 38 l of the buttock low basis weight area 38 It is a line (curved line) and is indicated by a dotted line in FIG. Hereinafter, the boundary between the buttock high basis weight region 55 and the buttock low basis weight region 38 is also referred to as a "second boundary portion 55BR". Further, the “basis weight” of the buttock low basis weight region 38 is surrounded by the vertically elongated portions 38l disposed at both ends in the left and right direction in FIG. 6 and the rear side edges of the second boundary portion 55BR and the absorbent core 11 It refers to the average basis weight of the area.

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 for explaining the deformation of the absorbent core 11 when the diaper 1 is worn.

In the central low

basis weight regions

32, 33, the absorbent core 11 penetrates in the thickness direction, and the rigidity is the lowest. That is, the absorbent core 11 is most likely to be bent and deformed in the central low

basis weight regions

32 and 33. Therefore, when the absorbent core 11 is sandwiched between the legs at the crotch of the wearer when the diaper 1 is worn, the absorbent core 11 is vertically moved at the central low basis weight regions 32, 33 (the absorbent core 11 Bend left and right along the longitudinal direction). Thereby, in the crotch region 11B between the central low

basis weight regions

32, 33 in the longitudinal direction, as shown in FIG. 7, the absorbent core 11 deforms in a convex shape along the longitudinal direction to the skin side of the wearer, Convex part 11t is formed. That is, the central low

basis weight regions

32, 33 have a function as a "folding guide region" for bending the absorbent core 11 along the longitudinal direction in the crotch region 11B. By convexly deforming the absorbent core 11 to the skin side at the crotch region 11 B, the convex portion 11 t can be easily fitted along the crevice of the wearer's excretion opening and buttocks, and the absorbability of excrement in the crotch region is improved. Can.

Then, in the front side portion 10F, from the crotch region 11B to the lower abdomen position 11A, the absorbent core 11 stands up along the curved surface shape of the abdomen of the wearer. 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 region 11B to the heel region 11C. Thereby, at the time of wear of the diaper 1, the absorptive core 11 deform | transforms into a shape like FIG.

Here, focusing on the deformation of the absorbent core 11 in the rear side portion 10R, when the diaper 1 is worn, in the crotch region 11B, as described above, the absorbent core 11 is convex on the skin side of the wearer. , And the protrusion 11t is continuous along the vertical direction (longitudinal direction of the absorbent core 11). If this convex portion 11t is formed continuously over the entire region in the vertical direction (longitudinal direction), the convex portion 11t is formed on the heel portion 11C, so the convex portion 11t hits the wearer's heel portion There is a possibility that the skin contact in the buttocks may deteriorate. In addition, a gap may be generated between the absorbent core 11 and the wearer's skin around the hips on the buttock side, which may cause excrement of excrement.

On the other hand, in the diaper 1 of the present embodiment, by providing the buttocks high basis weight region 55 on the upper side (rear side in the longitudinal direction) of the rear low basic weight region 39 in the rear side 10R. The absorbent core 11 is prevented from being convexly deformed in a region above (rear side) the buttocks high basis weight region 55. Specifically, the highly rigid buttock high basis weight region 55 blocks the transmission of the force for bending and deforming the absorbent core 11 so as to be convex on the skin side in the crotch portion 11B to the heel portion 11C. As a result, in the region above (but on the rear side of) the buttocks high basis weight region 55, the central portion in the left-right direction of the absorbent core 11 is suppressed from being convexly deformed toward the wearer's skin. It will stand on the buttocks side while maintaining the surface shape like. In particular, 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 rigidity of the absorbent core 11 is the lowest and it is easy to be bent. By providing the buttocks high basis weight region 55 on the upper side in the vertical direction (the rear side in the longitudinal direction), it is possible to suppress the influence of such bending from being transmitted to the buttocks side and to suppress the deterioration of the fit. .

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 back and forth during walking, the right and left regions The action of the opposite force (shearing force) tends to cause wrinkles or distortion. However, in the diaper 1, even if such wrinkles occur in the crotch region 11B, wrinkles are less likely to occur in the area on the rear side than the buttock high basis weight region 55.

Thus, by providing the buttocks high basis weight region 55, the force acting on the absorbent core 11 in the crotch region 11B is transmitted to the buttocks region 11C on the rear side of the buttocks high basis weight region 55. Being suppressed. Therefore, the absorbent core 11 is easily deformed differently between the crotch region 11B and the heel region 11C with the buttocks high basis weight region 55 interposed therebetween, and the fit in each region is improved.

Then, when the absorbent core 11 is deformed, the force acting to compress the absorbent core 11 in the left-right direction in the crotch region 11B is concentrated in the first boundary portion 55BF, and the first boundary portion 55BF Starting from, the absorbent core 11 largely rises to the buttocks side. As a result, the region above the buttocks high basis weight area 55 (rear side in the longitudinal direction) of the absorbent core 11 stands up on the buttocks side of the wearer without being deformed into a convex shape as in the crotch 11B. . Therefore, it becomes easy to deform the absorptive core 11 naturally according to a wearer's body shape.

Furthermore, since the first 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 upper side of the absorbent core 11 above the ridge high basis weight region 55 (longitudinal direction The region on the back side of the body rises diagonally along the slope of the boundary and deforms to wrap around the buttocks of the wearer. Thereby, the fit property of the absorptive core 11 in a wearer's buttocks can be improved.

Further, in the diaper 1, a plurality of vertically long portions 37 l are provided in the second crotch low basis weight region 37 that constitutes the rear side low basis weight region 39. This region is a region where a large force is likely to act by being pinched between the legs of the wearer at the crotch region 11B, and is absorbed along the roundness of the wearer's buttocks from the crotch region 11B to the heel region 11C. It is a portion where the sex core 11 starts to rise. In addition, when the wearer moves the leg, it is an area where wrinkles and the like are easily generated. Therefore, in the present embodiment, a plurality of longitudinally elongated portions 37l are provided in this region, and the absorbent core 11 is easily bent and deformed starting from the longitudinally elongated portions 37l. As a result, the absorbent core 11 is likely to be three-dimensionally deformed along the body shape near the buttocks of the wearer. 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 formation of wrinkles is suppressed, and the absorbent core 11 and the wearer's body Can be made less likely to occur.

Further, in the diaper 1, at least a part of the second inseam low basis weight region 37 (rear low basis weight region 39) overlaps with the rear stretchable region 22 s of the rear belt portion 22. In FIG. 5, the second crotch low basis weight region 37 and the rear stretchable region 22 s overlap in the region on the inner side in the left-right direction and the lower side in the vertical direction (the front side in the longitudinal direction) than the first boundary portion 55BF. ing. Therefore, when the diaper 1 is worn, a contraction force in the left-right direction by the rear stretchable area 22s acts on the second crotch low basis weight area 37 in the overlapping portion. As a result, in the region sandwiched by the first boundary portion 55BF in the left-right direction, the absorbent core 11 is easily shrunk and deformed, and the external force generated by the movement of the leg of the wearer is easily buffered. Therefore, transmission of force to the buttocks side can be more easily suppressed.

Further, in the diaper 1, the buttocks basis weight region 55 also overlaps with the rear side stretchable region 22 s of the rear side belt portion 22. A region having high rigidity such as the buttock high basis weight region 55 is a region that is basically difficult to be deformed and easily maintain a flat shape, and therefore, it is difficult to fit along the roundness of the wearer's buttocks. On the other hand, in the present embodiment, the hip portion high basis weight region 55 itself is easily deformed by applying a contraction force by the rear side stretchable region 22s. In addition, when the contraction force in the left-right direction acts from the non-skin side of the buttock high basis weight area 55, the buttock high basis weight area 55 is pressed against the skin of the wearer. Thereby, it becomes easy to stick to a wearer's skin, deforming so that a buttocks basis weight area 55 may form a curved surface along a roundness of a wearer's buttocks, and a fit property of absorptive core 11 in a buttocks is improved more It can be done.

Further, at least a part of the second inseam low basis weight area 37 (rear low basis weight area 39) overlaps with the rear side belt portion 22, the second inseam in the overlapping part. The rigidity on the non-skin side of the low basis weight region 37 is easily secured. Thereby, when the contraction force in the left-right direction acts on the absorbent core 11, the absorbent core 11 is more easily bent to the skin side than the non-skin side, so that the above-described convex deformation is easily generated. Further, the second crotch low basis weight region 37 itself can be freely deformed because of its low rigidity, whereas a plurality of sheet members (213, 214, etc.) are laminated on the non-skin side rear belt portion 22. Of the second crotch low basis weight area 37 by the movement of the leg of the wearer, etc., the absorbent core 11 is broken in the second crotch low basis weight area 37. Large twist is suppressed. That is, even when an excessive external force acts on the absorbent core 11, the external force is buffered by the rear belt portion 22, and breakage of the absorbent core 11 can be suppressed.

Moreover, in the rear side portion 10R of the absorbent core 11, the buttock low basis weight area 38 is provided on the upper side (rear side in the longitudinal direction) above the buttocks high basis weight area 55 in the vertical direction. The fit of the core 11 can be improved. As described above, the absorbent core 11 of the present embodiment is completely different in the upper area (the buttocks side) and the lower side (the crotch side) with respect to the buttocks high basis weight area 55. By providing the low basis weight region in the region, the absorbent core 11 can be more easily deformed naturally. For example, in the region above the buttocks high basis weight area 55 of the absorbent core 11, the buttocks low basis weight area 38 is deformed in a curved surface shape so as to wrap the buttocks of the wearer, thereby making the fit in the buttocks It can be enhanced.

Further, although the buttocks low basis weight region 38 has a plurality of vertically elongated portions 38l, these vertically elongated portions 38l are, as shown in FIG. 6, the absorbent core 11 from the second boundary portion 55BR in the vertical direction. It is provided continuously to the upper end (rear end in the longitudinal direction) of That is, the lower end position of the vertically elongated portion 38l in the vertical direction is an intersection point with the second boundary 55BR, and the upper end position in the vertical direction of the vertically elongated portion 38l is an intersection point with the upper end of the absorbent core 11. Since the longitudinally long portion 38l is provided to reach the upper end of the absorbent core 11, the stress acting on the buttocks high basis weight region 55 easily escapes to the upper end side of the absorbent core 11, and the absorbability at the heel portion 11C It becomes easy to suppress that wrinkles and distortion arise in core 11. Further, since the upper end position of the vertically elongated portion 38l and the upper end position of the absorbent core 11 are the same in the vertical direction, a portion having a low basis weight and low rigidity is formed at the upper end edge of the absorbent core 11 The edge portion becomes flexible and easily deformed. Therefore, the upper end portion of the absorbent core 11 is easily deformed in accordance with the waistline shape of the wearer's buttocks side, and the touch of the waistline can be softened. It is not necessary that all of the plurality of longitudinally elongated portions 38 l be provided so as to reach the upper end of the absorbent core 11, as long as some of the longitudinally elongated portions 38 l reach the upper end of the absorbent core 11.

Further, in the diaper 1, the second boundary portion 55BR is substantially V-shaped (U-shaped) inclined obliquely downward from the center in the left-right direction toward both outer sides. Therefore, in the absorbent core 11, the area above the buttocks basis weight area 55 (rear side in the longitudinal direction) rises obliquely along the slope of the second boundary 55BR, and the buttocks of the wearer are rounded. It becomes easy to form a curved surface that wraps around.

The inclination angle of the second boundary 55BR with respect to the left-right direction is smaller than the inclination angle of the first boundary 55BF with respect to the left-right direction. Here, the inclination angle with respect to the left-right direction refers to the smaller one of the angles formed by the boundary portions 55BF and 55BR with the left-right direction in the absorbent core 11 in a state of being expanded as shown in FIG. In FIG. 6, the inclination angle θ55BR of the second boundary 55BR is smaller than the inclination angle θ55BF of the first boundary 55BF (θ55BR <θ55BF).

At the first boundary 55BF close to the crotch region 11B, the deformation amount of the absorbent core 11 at the boundary can be increased by increasing the inclination angle θ 55BF. Therefore, the absorbent core 11 that has been convexly deformed at the crotch region 11B can be easily deformed so as to naturally rise toward the buttocks side. On the other hand, at the second boundary 55BR, the amount of deformation of the absorbent core 11 is smaller than that of the first boundary 55BF. Therefore, by reducing the inclination angle θ55BR, the absorbent core 11 becomes gentle along the ridges. To make it easier to

Further, as shown in FIG. 6, the length W55BR of the second boundary 55BR in the left-right direction is longer than the length W55BF of the first boundary 55BF in the left-right direction (W55BR> W55BF). Thereby, in 2nd boundary part 55BR near a wearer's buttocks, an absorptive core 11 can make an area which can be deformed wider. Therefore, the wide area of the buttocks is easily covered by the absorbent core 11, and the fit in the buttocks area can be further improved.

Further, in the diaper 1, at least a part of the rear low basis weight region 39 overlaps with the inseam elastic region 23 s. The stretchability in the vertical direction from the non-skin side acts on the back side low basis weight area 39 of the absorbent core 11 so that in the back side low basis weight area 39, the absorbent core 11 is the crotch area of the wearer It deforms to curve along the part. In addition, since the absorbent core 11 is easily bent to the skin side, the deformation to the above-described convex shape is promoted.

In addition, between the vertical direction of the rear side low basis weight region 39 and the first crotch low basis weight region 36, the basis weight is higher than the rear side low basis weight region 39 and the first crotch low basis weight region 36 " A second ridge high basis weight area 56 "is provided. The second buttocks high basis weight area 56 is a high basis weight area substantially similar to the buttocks high basis weight area 55, and is continuously formed in the left-right direction, and the rear low basis weight area 39 and the first crotch low basis weight The boundary with the region 36 is a region having a substantially U-shaped or V-shaped shape that is inclined obliquely downward from the center in the left-right direction toward the outer side. By providing the second buttocks high basis weight area 56 at a position closer to the crotch area 11B than the buttocks high basis weight area 55, a large force is exerted by the crotch area 11B being pinched by the wearer's leg or the like. Even in such a case, part of such a force is relieved in the second buttock high basis weight region 56, and it becomes easy to suppress the transmission of a large force to the heel portion 11C. Therefore, the fit of the absorbent core 11 can be further improved.

As mentioned above, although embodiment of this invention was described, said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. Further, it goes without saying that the present invention can be modified or improved without departing from the gist thereof, and that the present invention includes equivalents thereof.

1 Pants-type disposable diaper (diaper, pants-type absorbent article),
1a waist opening, 1b leg opening,
10 Absorbent body, 10F front side, 10R rear side,
11 absorbent core, 11A lower abdomen position, 11B crotch region, 11C heel region,
11c neck, 11t convex,
12 top sheets, 13 back sheets, 14 side sheets,
20 exterior members,
21 front belt portion (ventral side exterior member), 21s front elastic region,
211 waist area, 212 crotch area, 213 skin side sheet, 214 non-skin side sheet, 215 elastic nonwoven fabric,
22 back belt portion (back exterior member), 22s back stretchable area,
221 waist area, 222 crotch area, 223 skin sheet, 224 non-skin sheet, 225 elastic nonwoven fabric,
23 crotch member (crotch exterior member), 23s crotch stretch area,
231 skin sheet, 232 non-skin sheet, 233 elastic nonwoven fabric,
24 end junction area,
25a, 25b welds,
26 waist elastic members, 27 leg elastic members, 28 crotch elastic members,
32 central low basis weight area, 33 central low basis weight area,
36 crotch low basis weight area (1st crotch low low basis weight area), 36 l vertical part, 36 w horizontal part,
37 second inseam low basis weight area, 37 l vertical length, 37 w horizontal length,
38 buttocks low basis weight area, 38 l tall, 38 w horizontal,
39 back low basis weight area,
40 leakproof wall,
41 leak-barrier elastic member, 42 leak-barrier elastic member,
55 area high basis weight area, 55BF first boundary, 55BR second boundary,
56 2nd buttocks basis weight area,
CL predetermined position,
θ55BF inclination angle, θ55BR inclination angle

Claims

Have vertical and horizontal directions that cross each other, and
A pant-type absorbent article comprising an absorbent core disposed along the vertical direction, and an absorbent main body bent at the lower end in the vertical direction.
The absorbent core has a rear side portion which is a portion bent to the rear side in the front-rear direction,
The absorbent core is at the rear side,
Back side low basis weight area with lower average basis weight than surrounding area,
A buttock high basis weight area provided above the back side low basis weight area in the vertical direction and having an average basis weight higher than the back side low basis weight area;
Have
At least a part of the boundary between the rear low basis weight area and the buttocks high basis weight area is obliquely inclined downward from the center in the left-right direction toward the outer sides. Type absorbent article.
The pants-type absorbent article according to claim 1, wherein
The pants-type absorbent article, wherein the rear low basis weight region has a longitudinally long portion along the vertical direction.
The pants-type absorbent article according to claim 1 or 2,
And a rear side belt portion connected to the absorbent main body, the rear side stretchable region extending in the left-right direction;
The pants-type absorbent article, wherein at least part of the rear low basis weight region overlaps the rear elastic region in the vertical direction.
The pants-type absorbent article according to claim 3, wherein
The pants-type absorbent article, wherein in the vertical direction, the buttocks high basis weight area overlaps with the rear side stretchable area.
The pants-type absorbent article according to any one of claims 1 to 4, wherein
And a rear side belt portion connected to the absorbent main body, the rear side stretchable region extending in the left-right direction;
The pants-type absorbent article, wherein at least a part of the rear low basis weight region overlaps the rear belt portion in the vertical direction.
The pants-type absorbent article according to any one of claims 1 to 4, wherein
The absorbent core is at the rear side,
A pants-type absorbent article characterized by having a buttock low basis weight area lower in average basis weight than the surrounding area above the buttocks high basis weight area.
The pants-type absorbent article according to claim 6, wherein
At least a part of the boundary between the buttocks high basis weight area and the buttocks low basis weight area is obliquely inclined downward from the center in the left-right direction toward the outer side. Absorbent article.
The pants-type absorbent article according to claim 7, wherein
The smaller one of the angles formed by the boundary between the rear low basis weight area and the buttocks high basis weight area with respect to the lateral direction is
A pants-type absorbent article characterized in that a boundary between the buttocks high basis weight area and the buttocks low basis weight area is larger than the smaller one of the angles formed with respect to the lateral direction.
The pants-type absorbent article according to claim 6 or 7,
The length of the border between the buttocks high basis weight area and the buttocks low basis weight area in the left and right direction is the border between the rear low basis weight area and the buttocks high basis weight area in the left and right direction A pants-type absorbent article characterized in that it is longer than its length.
The pants-type absorbent article according to any one of claims 6 to 9, wherein
The buttock low basis weight region has a plurality of vertically elongated portions along the vertical direction,
The pants-type absorbent article, wherein the upper end position of at least a part of the longitudinally elongated portion and the upper end position of the absorbent core are the same in the vertical direction.
The pants-type absorbent article according to any one of claims 1 to 10, wherein
The pants-type absorbent article, wherein the rear low basis weight region has a longitudinally long portion along the vertical direction and a plurality of laterally long portions intersecting the longitudinally long portion.
The pants-type absorbent article according to any one of claims 1 to 11, wherein
A crotch member having a crotch elastic region which is laminated on the non-skin side of the absorbent core in the crotch region located on the crotch of the wearer when worn, and which extends and contracts along the vertical direction,
The pants-type absorbent article, wherein at least a part of the rear low basis weight region overlaps the inseam elastic region.
The pants-type absorbent article according to any one of claims 1 to 12, wherein
In the rear side portion, a central low basis weight area which penetrates the absorbent core along the vertical direction is provided on the lower side in the vertical direction of the buttocks high basis weight area and at the center in the horizontal direction. The pants-type absorbent article characterized by being provided.
The pants-type absorbent article according to any one of claims 1 to 13, wherein
In the rear side portion, a second ridge high basis weight region having an average basis weight higher than the rear low basis weight region is provided on the lower side in the vertical direction of the rear side low basis weight region A pants-type absorbent article characterized in that.