CN111374828A

CN111374828A - Pants-type diaper

Info

Publication number: CN111374828A
Application number: CN201911214733.4A
Authority: CN
Inventors: 川上祐介; 高居义; 郭晓彤
Original assignee: Unicharm Corp
Current assignee: Unicharm Corp
Priority date: 2018-12-29
Filing date: 2019-12-02
Publication date: 2020-07-07
Also published as: CN212166011U; JP2020108749A; WO2020137427A1

Abstract

Provided is a pants-type diaper which can ensure absorption performance and improve fitting performance. A pants-type diaper comprises a front side part (2), a back side part (3), and an absorbent main body (10) which is located between the front side part and the back side part and which includes an absorbent body (14). The absorbent body comprises a super absorbent polymer, and is provided with a Back Area (BA), a stomach area (FA), and a crotch area (MA) which are arranged in the longitudinal direction. The back-side region overlaps the back-side portion in the thickness direction. The ventral region overlaps the ventral portion in the thickness direction. The crotch region is located between the back-side region and the stomach-side region. At least one of the back-side region and the stomach-side region includes a low basis weight region in which the basis weight of the super absorbent polymer is lower than the basis weight of the super absorbent polymer in the crotch region.

Description

Pants-type diaper

Technical Field

The present invention relates to a pants-type diaper.

Background

Absorbent articles using an absorbent containing a relatively large amount of Super Absorbent Polymer (SAP) as an absorbent material are known. An absorbent material containing a relatively large amount of superabsorbent polymer (so-called SAP sheet) is thin, and therefore can improve wearability, fit, and the like, and is therefore preferable. As such an absorbent body, for example, patent document 1 discloses an absorbent core including an absorbent material. The absorbent core is used in an absorbent article, the absorbent material being substantially free of cellulose fibers, forming a pattern of individual absorbent material zones. The pattern includes at least one of a region extending in a width direction and a region extending in a length direction and a dot formation region.

Documents of the prior art

Patent document

Patent document 1: japanese Kohyo publication No. 2017-516542

Disclosure of Invention

Problems to be solved by the invention

When an absorbent body containing a relatively large amount of superabsorbent polymer is applied to a pants-type diaper, it is considered to use an absorbent body in which the superabsorbent polymer is substantially uniformly arranged in a flat shape. In this case, a super absorbent polymer having a predetermined basis weight such that liquid (exemplified by urine) to be excreted does not leak is disposed in the crotch region of the absorbent body. Correspondingly, the superabsorbent polymer having the predetermined basis weight is also disposed in the abdominal region and the back region, which are regions of the absorbent body other than the crotch region.

Here, in the pants-type diaper, the back-side region and the abdomen-side region of the absorber are brought into close contact with the skin of the wearer by the back-side portion and the abdomen-side portion of the pants-type diaper. In this case, if the superabsorbent polymer in the back-side region and the stomach-side region has a predetermined basis weight equivalent to that of the superabsorbent polymer in the crotch region, that is, if the back-side region and the stomach-side region have a thickness equivalent to that of the crotch region, the back-side region and the stomach-side region are too thick to be easily pulled into the back-side and stomach-side skin surfaces. In this case, the wearer may feel uncomfortable to the absorbent body when wearing the absorbent article, and the fit may be reduced. In this case, the absorption performance of at least the crotch region tends to be reduced when the entire absorbent body is made thin. In this case, there is a possibility that liquid leaks from the end portions in the width direction and the end portions in the longitudinal direction. In this way, in the pants-type diaper, there is room for improvement in the thickness of the absorbent body made of the super absorbent polymer in order to improve the fit and ensure the absorption performance.

In order to improve wearing comfort and the like, the absorbent core of patent document 1 is divided into a plurality of regions in a plan view. That is, in the absorbent core, the arrangement of the super absorbent polymer in the plane is changed. However, the arrangement of the super absorbent polymer in the thickness direction does not particularly vary.

The invention aims to provide a pants-type diaper which comprises a super absorbent polymer, wherein the pants-type diaper can ensure the absorption performance and improve the fitting performance.

Means for solving the problems

The pants-type diaper of the present invention is as follows. (1) A pants-type diaper having a longitudinal direction, a width direction, and a thickness direction which are orthogonal to each other, comprising a front side portion, a back side portion, and an absorbent body which is positioned between the front side portion and the back side portion and which includes an absorber, wherein the absorber contains a super absorbent polymer and has a back region, a stomach region, and a crotch region arranged in the longitudinal direction, the back-side region and the back-side portion overlap in the thickness direction, the stomach-side region and the stomach-side portion overlap in the thickness direction, the crotch region is located between the back-side region and the stomach-side region, and at least one of the back-side region and the stomach-side region includes a low basis weight region in which a basis weight of the super absorbent polymer is lower than a basis weight of the super absorbent polymer in the crotch region.

In the present pants-type diaper, the absorbent member has a relatively high weight per unit area of the superabsorbent polymer in the crotch region, and a relatively low weight per unit area of the superabsorbent polymer in the low weight per unit area of at least one of the back-side region and the stomach-side region. Therefore, since a relatively large amount of super absorbent polymer is disposed in the crotch region where liquid absorption is required, the absorbent body can reliably absorb liquid (exemplified by urine) without leakage while ensuring absorption performance. On the other hand, by arranging the super absorbent polymer in a small amount in a low basis weight region of at least one of the front side region and the back side region, which is not required to absorb liquid, the region can be made thin. Therefore, when the abdomen-side portion or the back-side portion corresponding to the region is brought into close contact with the skin surface of the wearer, the absorber can be made less likely to stick to the skin surface. This makes it difficult for the wearer to feel a sense of discomfort with respect to the absorbent body, and improves the fit. Thus, in the pants-type diaper including the super absorbent polymer, the absorption performance can be ensured and the fit can be improved.

The pants-type diaper according to the present invention may be (2) the pants-type diaper according to the above (1), wherein the back-side region includes: a backside low basis weight region as the low basis weight region; and a back-side high-basis-weight region located between the crotch region and the back-side low-basis-weight region in the longitudinal direction, the high-water-absorbent polymer having a basis weight equivalent to that of the crotch region.

In the pants-type diaper, a back-side high basis weight region in which the weight per unit area of the super absorbent polymer is relatively high is provided between the crotch region and the back-side low basis weight region. Thus, more liquid can be readily collected in the high basis weight region of the back side before the liquid reaches the low basis weight region of the back side. This reduces the amount of liquid that migrates and diffuses into the low-basis-weight region on the back side where the basis weight of the superabsorbent polymer is low, and thus prevents leakage of liquid from the end portion on the back side in the longitudinal direction of the pants-type diaper 1, thereby ensuring more reliable absorption performance.

The pants-type diaper of the present invention may be (3) the pants-type diaper according to the above (2), wherein the back-side region has a back-side non-disposed region that is adjacent to the back-side low basis weight region in the longitudinal direction on a side opposite to the back-side high basis weight region across the back-side low basis weight region, and does not contain the super absorbent polymer.

The pants-type diaper has a back-side non-arrangement region that does not contain a super absorbent polymer (including not only the case where the weight per unit area is zero but also the case where the weight per unit area is 5% or less of the weight per unit area of the back-side high-unit-area-weight region) at a position on the outer side in the longitudinal direction than the back-side low-unit-area-weight region. That is, since the back-side non-arrangement region can be made thinner by arranging the superabsorbent polymer less in the back-side non-arrangement region, the portion of the back-side portion corresponding to the back-side non-arrangement region can be made more closely to the skin surface of the wearer, and (the back-side non-arrangement region of) the absorbent body can be made less likely to stick to the skin surface. Also, the super absorbent polymer which hardly contributes to the absorption of liquid can be reduced. This ensures absorption performance and improves the adhesiveness, and the super absorbent polymer can be used efficiently.

The pants-type diaper according to the present invention may be (4) the pants-type diaper according to the above (3), wherein, in the longitudinal direction, when a length of the back-side high-basis-area-weight region is represented by a, a length of the back-side low-basis-area-weight region is represented by b, and a length of the back-side non-disposition region is represented by c, the b > the c > the a.

In the pants-type diaper, the length (a) of the region having the largest thickness, which is the region having a high back-side basis weight, is made the shortest in the longitudinal direction, so that the tucking of the back-side portion into the skin surface when the back-side portion is brought into close contact with the skin surface can be suppressed to a narrow range. This makes it more difficult for the wearer to feel a sense of discomfort when wearing the garment. Further, by maximizing the length (b) of the region of low back-side basis weight, i.e., the region having a middle thickness, it is possible to collect the liquid more reliably and to suppress the penetration into the skin surface to a smaller extent. This ensures more reliable absorption performance and improves the adhesion.

The pants-type diaper of the present invention may be (5) the pants-type diaper according to the above (3) or (4), wherein an end portion of the abdomen-side region on the front side in the longitudinal direction has an abdomen-side non-arrangement region in which a weight per unit area of the superabsorbent polymer is equal to a weight per unit area of the superabsorbent polymer in the back-side non-arrangement region, and a length of the abdomen-side non-arrangement region is shorter than a length of the back-side non-arrangement region in the longitudinal direction.

In the pants-type diaper, the length of the abdomen-side non-disposed region in which the weight per unit area of the superabsorbent polymer in the abdomen-side region is relatively low is made shorter than the length of the back-side non-disposed region in which the weight per unit area of the superabsorbent polymer in the back-side region is relatively low in the longitudinal direction. This ensures that the volume capable of absorbing liquid is large on the ventral side where liquid spreads more than on the dorsal side. This ensures absorption performance without leakage and reliably absorbs liquid.

The pants-type diaper of the present invention may be (6) the pants-type diaper according to any one of (2) to (5), wherein the abdomen-side region does not have the low basis weight region but has an abdomen-side high basis weight region which is adjacent to the crotch region in the longitudinal direction, and the high water-absorbent polymer in the abdomen-side high basis weight region has a basis weight equal to the high water-absorbent polymer in the crotch region.

In the pants-type diaper, the abdomen-side region does not have a low basis weight region where the basis weight of the super absorbent polymer is low, and has an abdomen-side high basis weight region where the basis weight of the super absorbent polymer is high. This ensures that the volume capable of absorbing liquid is large on the ventral side where liquid spreads more than on the dorsal side. Therefore, the liquid can be reliably absorbed without leakage while ensuring the absorption performance.

The pants-type diaper of the present invention may be (7) the pants-type diaper according to the above (6), wherein an amount of the superabsorbent polymer used in the abdomen-side high basis weight region is larger than a sum of an amount of the superabsorbent polymer used in the back-side high basis weight region and an amount of the superabsorbent polymer used in the back-side low basis weight region.

In the pants-type diaper, the superabsorbent polymer has a higher basis weight in the abdomen-side high basis weight region than in the region in which the back-side high basis weight region and the back-side low basis weight region are combined. Therefore, the volume capable of absorbing the liquid can be secured to be larger on the abdomen side where the liquid spreads more than on the back side. Therefore, the liquid can be reliably absorbed without leakage while ensuring the absorption performance.

The pants-type diaper of the present invention may be (8) the pants-type diaper according to the above (6) or (7), wherein a combined length of the back-side high unit area weight region and the back-side low unit area weight region is longer than a length of the abdomen-side high unit area weight region in the longitudinal direction.

In the pants-type diaper, the combined length of the back-side high basis weight region and the back-side low basis weight region is longer than the length of the abdomen-side high basis weight region. Therefore, in the back side where conduction leakage of liquid is likely to occur as compared with the ventral side, a region where liquid can be collected can be ensured longer in the back side. Therefore, the liquid can be reliably absorbed without leakage over a wide range of absorption performance.

The pants-type diaper of the present invention may be (9) the pants-type diaper according to any one of the above (6) to (8), wherein each of the back-side portion and the stomach-side portion has: a low stretch region located at a central portion in the width direction, extending outward from an inner end edge in the longitudinal direction, and having low stretchability in the width direction; and a pair of high expansion/contraction regions adjacent to both sides of the low expansion/contraction region in the width direction, the high expansion/contraction region having high expansion/contraction properties in the width direction, the low expansion/contraction region of the back side portion overlapping with the back side low unit area weight region and the back side high unit area weight region in a plan view, and the low expansion/contraction region of the stomach side portion overlapping with the stomach side high unit area weight region in a plan view.

In the pants-type diaper, the low stretch region of the back side portion overlaps the back side low basis weight region and the back side high basis weight region, and the low stretch region of the stomach side portion overlaps the stomach side high basis weight region. This can suppress the contraction of each of the high and low basis weight regions in the width direction, and therefore can suppress the reduction in the absorption performance due to the contraction of the absorbent body.

The pants-type diaper according to the present invention may be (10) the pants-type diaper according to the above (9), wherein each of the back side portion and the stomach side portion further has another high stretchability region adjacent to and outside the pair of high stretchability regions and the low stretchability region in the longitudinal direction, and the other high stretchability region of the back side portion overlaps with a region of the absorbent body that is outside the back side low basis weight region in the longitudinal direction, and the other high stretchability region of the stomach side portion overlaps with a region of the absorbent body that is outside the stomach side high basis weight region in the longitudinal direction.

In the pants-type diaper, the other highly stretchable region of the back side portion overlaps with a region of the absorbent body located longitudinally outward of the back-side low-basis-weight region, and the other highly stretchable region of the stomach side portion overlaps with a region of the absorbent body located longitudinally outward of the stomach-side high-basis-weight region. Thus, by the contraction of the other high stretchability region, the portion of the back side portion located outside the low basis weight region of the absorbent body in the longitudinal direction and the portion of the abdominal side portion located outside the high basis weight region of the absorbent body in the longitudinal direction can be further pulled in the width direction, and this portion can be further pressed toward the skin side. This makes it possible to further adhere both ends of the absorbent body in the longitudinal direction to the skin surface.

The pants-type diaper of the present invention may be (11) the pants-type diaper according to any one of (1) to (10), wherein the absorber further includes: 1 st absorption layer comprising the superabsorbent polymer; and a2 nd absorbent layer which is located on one side of the 1 st absorbent layer in the thickness direction and contains the super absorbent polymer, wherein at least one of both end portions of the 2 nd absorbent layer in the longitudinal direction in a plan view contains a protruding portion protruding outward from an end edge of the 1 st absorbent layer, and the protruding portion contains the low basis weight region.

In the pants-type diaper, the absorber has a two-layer structure in which the 1 st absorbent layer and the 2 nd absorbent layer are laminated, and the low-basis-weight region includes a protruding portion protruding outward from the end edge of the 1 st absorbent layer in the end portion of the 2 nd absorbent layer in a plan view. Therefore, the thickness of the low basis weight region can be reliably reduced. Thus, when the ventral portion or the dorsal portion corresponding to the low basis weight region is in close contact with the skin surface of the wearer, the low basis weight portion can be made less likely to stick into the skin surface. This makes it difficult for the wearer to feel uncomfortable, and improves the fit.

The pants-type diaper of the present invention may be (12) the pants-type diaper of (11) above, wherein the 2 nd absorbent layer is positioned on the non-skin side of the 1 st absorbent layer, the absorbent body further comprises an intermediate layer which is positioned between the 1 st absorbent layer and the 2 nd absorbent layer, which is formed of a nonwoven fabric, and the skin-side surface of the low basis weight region is covered with the intermediate layer.

In the pants-type diaper, the second absorbent layer 2 is provided with an intermediate layer of nonwoven fabric on the skin side, and the skin-side surface of the low basis weight region is covered with the nonwoven fabric (intermediate layer). Therefore, even when the low basis weight region of the absorbent body is pressed against the skin surface when the back side portion is in close contact with the skin surface, the skin-side surface of the low basis weight region is covered with the nonwoven fabric, and therefore, unevenness due to the super absorbent polymer is not felt, and a feeling of discomfort during wearing can be hardly felt. This can suppress a decrease in adhesion.

The pants-type diaper of the present invention may be (13) the pants-type diaper according to any one of (1) to (12) above, further comprising a printed film between the back-side portion and the back-side region, wherein the back-side region includes a back-side low-basis-weight region in which a weight per unit area of the super absorbent polymer is lower than a weight per unit area of the super absorbent polymer in the crotch region.

In the pants-type diaper, a printed film is disposed between a back-side region having a relatively thin back-side low basis weight portion and a back-side portion. Therefore, the thickness of the entire portion (back region + printed film) sandwiched between the back side portion and the skin surface can be reduced when worn. Thus, when the back side portion is brought into close contact with the skin surface, the thickness of the printed film is not felt, and a feeling of discomfort during wearing can be hardly felt, and a decrease in the adhesiveness can be suppressed.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, a pants-type diaper can be provided which contains a super absorbent polymer, wherein the pants-type diaper can ensure absorption performance and improve fit.

Drawings

Fig. 1 is a plan view showing a configuration example of a pants-type diaper according to an embodiment.

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

Fig. 3 is a plan view and a sectional view showing a configuration example of the absorber of the embodiment.

Fig. 4 is a partially enlarged plan view of a back side portion of the pants-type diaper according to the embodiment.

Fig. 5 is a partially enlarged plan view of a stomach portion of the pants-type diaper according to the embodiment.

Description of the reference numerals

1: pants-type diaper

2: ventral part (ventral girdle)

3: back side part (Back side belt)

10: absorbent body

14: absorbent body

BA: back side area

FA: ventral region

MA: crotch area

Detailed Description

Hereinafter, a pants-type disposable diaper according to the embodiment (hereinafter, also simply referred to as "pants-type diaper") will be described. The type of the pants-type diaper is not limited to this example, and other types of pants-type diapers may be used without departing from the scope of the present invention. Examples of such a pants-type diaper include a 3-piece diaper.

Fig. 1 and 2 are views showing a configuration example of a pants-type diaper 1 according to an embodiment. Fig. 1 is a plan view showing a state in which a pants-type diaper 1 is unfolded, and fig. 2 is a sectional view taken along line II-II of fig. 1. The pants-type diaper 1 has a longitudinal direction L, a width direction W, and a thickness direction T which are orthogonal to each other in the state shown in fig. 1, and has a longitudinal direction center line CL which passes through the center of the width direction W and extends in the longitudinal direction L, and a width direction center line CW which passes through the center of the length direction L and extends in the width direction W. The direction and the side close to the longitudinal center line CL are set as the inward direction and the inward side in the width direction W, respectively, and the direction and the side away from the longitudinal center line CL are set as the outward direction and the outward side in the width direction W, respectively. The direction and the side closer to the width direction center line CW are set as the inward direction and the inward side in the longitudinal direction L, respectively, and the direction and the side farther from the width direction center line CW are set as the outward direction and the outward side in the longitudinal direction L, respectively. The side of the pants-type diaper 1 facing the end edge of the wearer corresponding to the abdomen (end edge on the abdomen side) in the longitudinal direction L is also referred to as the front side in the longitudinal direction L, and the side of the pants-type diaper 1 facing the end edge of the wearer corresponding to the back (end edge on the back side) is also referred to as the back side in the longitudinal direction L. The "plan view" refers to the pants-type diaper 1 in a state where a plane including the longitudinal direction L and the width direction W is developed as viewed from above in the thickness direction T, and the "plan view" refers to a shape grasped in the plan view. The "planar direction" is an arbitrary direction parallel to a plane including the width direction W and the length direction L. The "skin side" and the "non-skin side" refer to a side relatively close to the skin surface of the wearer and a side relatively distant from the skin surface of the wearer in the thickness direction T when the pants-type diaper 1 is worn on the wearer, respectively. These definitions apply not only to the pants-type diaper 1 but also to the absorber of the pants-type diaper 1 and the respective materials disposed thereon.

The member, structure, shape, and the like extend along the longitudinal direction L, and include not only a case where the member and the like are parallel to the longitudinal direction L, but also a case where the component Dx in the longitudinal direction L of the member and the like is larger than the component Dy in the width direction W of the member and the like (Dx > Dy). Similarly, the member or the like extends in the width direction W, and includes not only a case where the member or the like is parallel to the width direction W but also a case where the component Dy in the width direction W of the member or the like is larger than the component Dx in the longitudinal direction L of the member or the like (Dy > Dx). For a curved or curved member, the member is evaluated as described above with respect to the tangent line at each point on the curve or the like.

As shown in fig. 1, the pants-type diaper 1 includes a front side portion (front side waistband) 2, a back side portion (back side waistband) 3, and an absorbent main body 10 positioned between the front side portion 2 and the back side portion 3 in a longitudinal direction L. In the present embodiment, the pants-type diaper 1 further includes a crotch portion 4 located between the abdomen-side portion 2 and the back-side portion 3. The abdomen portion 2 is a portion that abuts against the abdomen of the wearer. The back portion 3 is a portion that abuts against the hip or the back of the wearer. The absorbent body 10 is a portion that comes into contact with the crotch of the wearer, and has one end portion in the longitudinal direction L stacked on the stomach-side portion 2 and the other end portion stacked on the back-side portion 3. The crotch portion 4 is a portion that supports the absorbent main body 10 from the non-skin side. The pants-type diaper 1 is formed by overlapping both

end portions

2a, 2a in the width direction W of the front side portion 2 and both

end portions

3a, 3a in the width direction W of the back side portion 3 in the thickness direction T, respectively, and joining them along the longitudinal direction L. In this case, in the pants-type diaper 1, the waist opening through which the waist of the wearer passes is defined by the outer end 2e of the stomach-side portion 2 in the longitudinal direction L and the outer end 3e of the back-side portion 3 in the longitudinal direction L. In the pants-type diaper 1, a pair of leg openings through which the legs of the wearer pass are defined by the

side portions

5e, 5e on both sides in the width direction W of the crotch portion 4. The abdomen-side portion (abdomen-side waistband) 2 and the back-side portion (back-side waistband) 3 can be said to be defined by the range of the longitudinal direction L in which the both

end portions

2a, 2a and the both

end portions

3a, 3a are joined.

In the present embodiment, in the state shown in fig. 1, each of the ventral portion 2 and the dorsal portion 3 has a rectangular shape that is expanded substantially in the width direction W and is separated from each other in the longitudinal direction L. The crotch portion 4 is located between the stomach portion 2 and the back portion 3, and both side edges in the width direction W are recessed inward in the width direction W. The stomach-side portion 2, the crotch portion 4, and the back-side portion 3 are integrally formed with each other. In another embodiment, the stomach-side portion 2, the crotch portion 4, and the back-side portion 3 are formed independently of each other. In another embodiment (not shown), the pants-type diaper 1 includes a front side portion 2 and a back side portion 3, and does not include a crotch portion 4.

In the present embodiment, the stomach portion 2, the back portion 3, and the crotch portion 4 are provided with liquid-impermeable cover sheets (sheet members) 5. The cover sheet 5 includes a cover sheet 5a on the skin side and a cover sheet 5b on the non-skin side. The cover sheet 5a and the cover sheet 5b are laminated in the thickness direction T and bonded to each other with an adhesive or the like. Both ends in the longitudinal direction L of the covering sheet 5b are folded back toward the skin side so as to cover both ends in the longitudinal direction L of the covering sheet 5 a. In this case, the portion of the covering sheet 5b at the folded-back position of the abdomen portion 2 constitutes the end 2e of the abdomen portion 2, and the portion of the covering sheet 5b at the folded-back position of the back portion 3 constitutes the end 3e of the back portion 3.

As the cover sheet 5, for example, there may be mentionedExamples thereof include any liquid-impermeable sheet such as liquid-impermeable nonwoven fabric, synthetic resin film, composite sheet thereof, SB nonwoven fabric, and SMS nonwoven fabric. Examples of the material of the cover sheet 5 include polyolefin materials such as polypropylene and polyethylene. The weight per unit area of the cover sheet 5 is, for example, 5g/m²～100g/m²Preferably 10g/m²～50g/m². The dimension (thickness) of the cover sheet 5 in the thickness direction T is, for example, 0.1mm to 5mm, preferably 0.1mm to 2 mm. In another embodiment, the number of the cover sheets 5 is one or three or more (not shown). In yet another embodiment, the cover sheet 5b is not folded back (not shown).

In the present embodiment, the abdomen-side portion 2 is provided with a plurality of

elastic members

6a, 6b for waist gather between the covering sheet 5a and the covering sheet 5b, and the back-side portion 3 is provided with a plurality of

elastic members

7a, 7b for waist gather between the covering sheet 5a and the covering sheet 5 b. The plurality of

elastic members

6a and 6b are disposed inside and outside the abdominal portion 2 in the longitudinal direction L. The plurality of elastic members 6a are arranged in the longitudinal direction L along the width direction W in predetermined regions on both sides across the longitudinal center line CL at intervals. The predetermined region is a region from the end portion 2a to a portion inside an end edge of the absorbent main body 10 in the width direction W opposed to the end portion 2 a. The plurality of elastic members 6b extend from the one end portion 2a to the other end portion 2a in the width direction W, and are arranged at intervals in the longitudinal direction L. Similarly, the plurality of

elastic members

7a and 7b are disposed inside and outside the back portion 3 in the longitudinal direction L. The plurality of elastic members 7a are arranged in the longitudinal direction L along the width direction W in predetermined regions on both sides across the longitudinal center line CL at intervals from each other. The predetermined region is a region from the end portion 3a to a portion inside an end edge of the absorbent main body 10 in the width direction W opposed to the end portion 3 a. The plurality of elastic members 7b extend from the one end portion 3a to the other end portion 3a in the width direction W and are arranged at intervals in the longitudinal direction L. The plurality of

elastic members

6a, 6b, 7a, and 7b are for extending and contracting the waist opening, and are exemplified by rubber bands. The abdomen-side portion (abdomen-side waistband) 2 and the back-side portion (back-side waistband) 3 may be defined by a range in the longitudinal direction L in which the plurality of

elastic members

6a, 6b, 7a, 7b are arranged.

In the present embodiment, the pants-type diaper 1 includes a plurality of elastic members 8 for leg gathers from the crotch portion 4 to the back portion 3 and the stomach portion 2. The plurality of elastic members 8 are provided extending in the longitudinal direction L mainly at both ends in the width direction W of the crotch portion 4. The plurality of elastic members 8 are for expanding and contracting the pair of leg openings, respectively, and are exemplified by rubber bands.

In the present embodiment, the absorbent body 10 has a substantially rectangular shape, and includes a liquid-permeable front sheet 12, a liquid-impermeable back sheet 13, and an absorbent body 14 that is positioned between the front sheet 12 and the back sheet 13 and absorbs and retains liquid. Examples of the top sheet 12 include a liquid-permeable nonwoven fabric, a woven fabric, a synthetic resin film having liquid-permeable holes formed therein, and a composite sheet thereof. Examples of the back sheet 13 include liquid-impermeable nonwoven fabric, synthetic resin film, composite sheets thereof, and SMS nonwoven fabric. The absorbent body 14 in the present embodiment includes an absorbent core for absorbing and retaining liquid and a core wrap enclosing the absorbent core. The absorbent body 14 will be described in detail later. The absorbent body 14, the front sheet 12, and the back sheet 13 are bonded together with an adhesive, and the front sheet 12 and the back sheet 13 are bonded together with an adhesive at their peripheral edge portions. The adhesive is a material known in pants-type diapers, and examples thereof include hot melt adhesives. The shape of the absorbent main body 10 is not limited to the above example as long as it is long in the longitudinal direction L, and examples thereof include a rectangular shape with rounded corners, a rectangular shape with a short side being a curve protruding outward, and an hourglass shape. In another embodiment, the back sheet 13 is omitted, and the non-skin side surface of the absorbent body 14 and the non-skin side surface of the peripheral edge portion of the top sheet 12 are joined to the cover sheet 5.

In the present embodiment, the surface of the absorbent main body 10 on the skin side includes a pair of

side sheets

17 and 17 located on both sides in the width direction W and extending in the longitudinal direction L. Each side sheet 17 has a leakage preventing wall 16 and

fastening regions

15, 15. The

fastening regions

15, 15 are positioned at the front and rear ends of the side sheet 17 in the longitudinal direction L and are fastened to the skin-side surface of the absorbent main body 10. The leakage preventing wall 16 is located between the front and

rear fastening regions

15, 15 in the longitudinal direction L of the side sheet 17, is adjacent to them, and fastens the outer end edge in the width direction W to the skin-side surface of the absorbent main body 10, and fastens the inner end edge in the width direction W. In this case, the leakage preventing walls 16 and the

fastening regions

15, 15 are formed by, for example, inner portions of the side sheets 17 in the width direction W, and outer portions of the side sheets 17 in the width direction W are fastened to the absorbent main body 10. In this manner, the absorbent main body 10 includes the pair of

leakage preventing walls

16, 16. The pair of

leakage preventing walls

16, 16 are disposed so as to face each other at both end portions in the width direction W on the skin side of the absorbent main body 10, and extend continuously along the longitudinal direction L. Each of the leakage preventing walls 16 includes two elastic members 61 extending in the longitudinal direction L at inner ends in the width direction W. The elastic member 61 is exemplified as a rubber band. In another embodiment, the pair of

leakage preventing walls

16 and 16 are folded back such that the inner ends in the width direction W are further folded back toward the outer sides in the width direction W. In another embodiment, the number of the elastic members 61 is one or more than three. The pair of

leakage preventing walls

16, 16 are each formed of a hydrophobic sheet, such as a hydrophobic nonwoven fabric. In another embodiment, it is formed of a hydrophilic sheet, such as a hydrophilic nonwoven fabric.

Next, the absorbent body 14 will be described with reference to fig. 1 to 3. Fig. 3 is a diagram showing a configuration example of the absorbent body 14 of the embodiment, fig. 3 (a) is a plan view, and fig. 3 (b) is a cross-sectional view taken along line IIIb-IIIb in fig. 3 (a). The absorbent body 14 is a layer having liquid absorbing performance and liquid retaining performance, and in the present embodiment includes a1 st absorbent layer 41 on the skin side, a2 nd absorbent layer 42 on the non-skin side, and an intermediate layer 43 between the 1 st absorbent layer 41 and the 2 nd absorbent layer 42. The absorbent body 14 has a two-layer structure in which the 1 st absorbent layer 41, the intermediate layer 43, and the 2 nd absorbent layer 42 are sequentially stacked in the thickness direction T. In another embodiment, the absorbent body 14 has a single-layer structure in which the 1 st absorbent layer 41 and the 2 nd absorbent layer 42 are integrated in the thickness direction without the intermediate layer 43. In another embodiment, the absorbent body 14 has a multilayer structure of three or more layers in which another intermediate layer and another absorbent layer are further stacked between the 1 st absorbent layer 41 and the 2 nd absorbent layer 42. In another embodiment, the 1 st absorbent layer 41 is on the skin side and the 2 nd absorbent layer 42 is on the non-skin side.

In the present embodiment, the absorber 14 has a substantially rectangular planar shape extending in the longitudinal direction L. The absorbent body 14 can be considered to have the 1 st and 2 nd water

absorbent materials

45 and 47 as absorbent cores and the 1 st and 2

nd base materials

44 and 46 as core claddings. However, the shape is not particularly limited, and examples thereof include a rectangle having a short side projecting in an arc shape, a rounded rectangle, an ellipse, and an hourglass shape. The thickness of the absorbent member 14 is, for example, 0.5mm to 20mm, preferably 1mm to 10 mm. The basis weight of the absorbent body 14 can be appropriately adjusted in accordance with the absorption performance required of the pants-type diaper 1, but for example, 60g/m is mentioned²～1600g/m²。

In the present embodiment, the 1 st absorbent layer 41 includes a1 st base 44 formed of a liquid-permeable sheet and a1 st absorbent material 45 having a water-absorbent material containing a water-absorbent polymer and disposed on the intermediate layer 43 side of the 1 st base 44. The 1 st absorbent layer 41 can be viewed as having the 1 st absorbent material 45 as the absorbent core, and the 1 st substrate 44 (and intermediate layer 43) as the core cladding. In another embodiment, the core wrap layer includes a core wrap sheet made of, for example, a wadding paper material, which is wrapped with the 1 st water absorbent material 45, on the inside of the 1 st base material 44 (and the intermediate layer 43) in addition to them. The 1 st water absorbent material 45 is fixed to at least one of the 1 st base material 44 and the intermediate layer 43 by an adhesive applied to at least one of the surface of the 1 st base material 44 on the intermediate layer 43 side and the surface of the intermediate layer 43 on the 1 st base material 44 side. The water absorbing material of the 1 st water absorbing material 45 is disposed in the 1 st absorbing layer 41 with a substantially uniform basis weight. However, the weight per unit area of the end portions in the longitudinal direction L and/or the width direction W may be gradually reduced toward the edges. In this case, the end portion is, for example, a region within 10% of the maximum dimension in the longitudinal direction L and/or the width direction W at both ends in the longitudinal direction L and/or the width direction W. In another embodiment, the water absorbent material of the 1 st water absorbent material 45 is disposed in a predetermined distribution having a large portion and a small portion per unit area weight in the 1 st absorbent layer 41. The 1 st water absorbing material 45 has a substantially rectangular planar shape. The 1 st base material 44 has a substantially rectangular planar shape, and covers the 1 st absorbent material 45 from the skin side in plan view, and the peripheral edge portion of the 1 st base material 44 extends slightly outward from the periphery of the 1 st absorbent material 45. The outer dimension (outer edge) of the 1 st absorption layer 41 in the plane direction is, for example, the outer dimension (outer edge) of the 1 st water-absorbent material 45 in the plane direction. The outer dimension (outer edge) is measured at, for example, a middle position in the thickness direction T of the 1 st water absorbent material 45.

In the present embodiment, the 2 nd absorbent layer 42 includes a2 nd base 46 formed of a sheet having water retentivity and liquid diffusibility, and a2 nd water-absorbent material 47 having a water-absorbent material containing a water-absorbent polymer and disposed at a position closer to the intermediate layer 43 side than the 2 nd base 46. The 2 nd absorbent layer 42 can be considered to have the 2 nd absorbent material 47 as the absorbent core and the 2 nd substrate 46 (and intermediate layer 43) as the core cladding. In another embodiment, the core wrap includes a core wrap sheet made of, for example, a wadding paper material, which wraps the 2 nd water absorbent material 47, on the inside of the 2 nd base material 46 (and the intermediate layer 43), in addition to the core wrap. The 2 nd water absorbing material 47 is fixed to at least one of the 2 nd base material 46 and the intermediate layer 43 with an adhesive applied to at least one of the surface of the 2 nd base material 46 on the intermediate layer 43 side and the surface of the intermediate layer 43 on the 2 nd base material 46 side. The absorbent material of the 2 nd absorbent material 47 is disposed in the 2 nd absorbent layer 42 with a substantially uniform basis weight except for the pair of channels 48, 48 (described later). However, the weight per unit area of the end portions in the longitudinal direction L and/or the width direction W may be gradually reduced toward the edges. In this case, the end portions are as described above. In another embodiment, the water absorbent material of the 2 nd water absorbent material 47 is disposed in a predetermined distribution having a larger area weight portion and a smaller area weight portion within the 2 nd absorbent layer 42. The 2 nd water absorbing material 47 has a substantially rectangular planar shape one turn larger than the 1 st water absorbing material 45 in the width direction W and the length direction L. The 2 nd base material 46 has a substantially rectangular planar shape, and covers the 2 nd absorbent material 47 from the non-skin side in plan view, and the peripheral edge portion of the 2 nd base material 46 extends slightly outward from the periphery of the 2 nd absorbent material 47. At this time, both end portions in the width direction W of the 2 nd base material 46 cover both side surfaces of the 2 nd water absorbent material 47, and cover skin-side surfaces of both end portions in the width direction W of the 1 st base material 44. That is, on the skin-side surface of the end portion in the width direction W of the 1 st absorbent layer 41, the end portion in the width direction W of the 2 nd base material 46 and the end portion in the width direction W of the 1 st base material 44 are overlapped and joined. The outer dimension (outer edge) of the 2 nd absorption layer 42 in the plane direction is, for example, the outer dimension (outer edge) of the 2 nd water-absorbent material 47 in the plane direction. The outer dimension (outer edge) is measured at, for example, an intermediate position in the thickness direction T of the 2 nd water absorbent material 47.

As described above, the both end portions in the width direction W of the 2 nd base 46 cover the side surfaces in the width direction W of the 2 nd water absorbent 47 and the side surfaces in the width direction W of the 1 st base 44, whereby the 2 nd water absorbent 47 is enclosed in the 2 nd absorbent layer 42 in the width direction W and the 1 st water absorbent 45 is enclosed in the 1 st absorbent layer 41 in the width direction W. In another embodiment, both ends of the 1 st base 44 in the width direction W cover both ends of the 2 nd base 46 in the width direction W. In another embodiment, the 1 st base material 44, the intermediate layer 43, and the 2 nd base material 46 are laminated and joined in the thickness direction T at both ends in the width direction W.

In the present embodiment, the 1 st base material 44, the intermediate layer 43, and the 2 nd base material 46 are laminated and joined in the thickness direction T at both ends in the longitudinal direction L of the absorbent body 14. Thus, the 1 st water absorbent material 45 is enclosed in the 1 st absorbent layer 41 by the 1 st base material 44 and the intermediate layer 43 in the longitudinal direction L, and the 2 nd water absorbent material 47 is enclosed in the 2 nd absorbent layer 42 by the 2 nd base material 46 and the intermediate layer 43 in the longitudinal direction L. In another embodiment, both ends of the absorbent body 14 in the longitudinal direction L are not covered with the 1 st base material 44 and the 2 nd base material 46.

In the present embodiment, the intermediate layer 43 is a liquid-permeable sheet and has a substantially rectangular planar shape. The intermediate layer 43 includes an upper layer 43a and a pair of

lower layers

43b, 43b adjacent to each other on both sides in the width direction W of the non-skin side surface of the upper layer 43 a. The intermediate layer 43 is formed by folding back and overlapping a pair of side portions located on both sides of a central portion in the width direction W toward the non-skin side of the central portion in a sheet member having a substantially rectangular planar shape. At this time, the central portion of the sheet member becomes the upper layer 43a, and the pair of side portions of the sheet member becomes the pair of

lower layers

43b, 43 b. Therefore, both sides of the intermediate layer 43 in the width direction W have a two-layer structure in which the upper layer 43a and the lower layer 43b are stacked, and have a substantially rectangular shape extending in the longitudinal direction L. The portion 43d in the vicinity of the center of the intermediate layer 43 in the width direction W has a single-layer structure of only the upper layer 43a, and has a substantially rectangular shape extending in the longitudinal direction L. The upper layer 43a and the lower layer 43b of the two-layer structure are joined by a pair of heat-

seal portions

43c, 43c extending in the longitudinal direction L on both sides in the width direction W of the portion 43 d. The heat-seal lands 43c are formed by heating and compressing. In another embodiment, the upper layer 43a and the lower layer 43b of the two-layer construction are joined with embossed portions extending along the length direction L on both sides in the width direction W of the portion 43 d. The embossed portion is formed by compression. In another embodiment, the heat-seal land and the embossed land have a shape of a plurality of dots, a plurality of curves, or a pattern. Both end edges in the width direction W of the intermediate layer 43 are sandwiched and bonded to both end portions in the width direction W of the 1 st base material 44 and the 2 nd base material 46, and both end edges in the length direction L of the intermediate layer 43 are sandwiched and bonded to both end portions in the length direction L of the 1 st base material 44 and the 2 nd base material 46. In another embodiment, the both end edges in the longitudinal direction L are not sandwiched between the both end portions in the longitudinal direction L of the 1 st base material 44 and the 2 nd base material 46, and are not joined. By adopting the double-layer structure, the liquid can be stored temporarily, and the time required for the super absorbent polymer to absorb can be easily ensured.

In the present embodiment, the absorber 14 has a pair of

channels

48, 48 extending along the longitudinal direction L. The pair of

passages

48, 48 are strip-shaped regions located on the 2 nd absorbent layer 42, extending in the longitudinal direction L, and arranged at predetermined intervals on both sides in the width direction W with respect to the longitudinal center line CL. The channel 48 is formed at least in the center portion in the longitudinal direction L across the width direction center line CW. In another embodiment, the channel 48 is formed to reach at least one of both end edges in the longitudinal direction L. The pattern of the pair of

passages

48, 48 in plan view is, for example, a pattern formed so that the interval between the two is constant along the longitudinal direction L. In another embodiment, the pattern of the pair of

passages

48, 48 is formed such that the interval between the passages is narrower near the center in the longitudinal direction L and expands toward both outer sides in the longitudinal direction L, for example. Here, the channels 48 are regions where the weight per unit area of the water-absorbent material is smaller than the regions around the channels of the absorbent body 14, and for example, regions where the weight per unit area of the water-absorbent material is smaller than the regions around the channels 48 of the 2 nd absorbent layer 42, including the case where the weight per unit area is zero. The channels 48 are formed in such a manner that the 2 nd base material 46 is recessed toward the intermediate layer 43 side, that is, the 2 nd water absorbing material 47 is recessed toward the intermediate layer 43 side. In another embodiment, the 2 nd water absorbent 47 is formed so as to be recessed toward the 2 nd base 46 side. The pair of

passages

48, 48 overlaps the pair of heat-

seal lands

43c, 43c in the thickness direction T. In another embodiment, at least a part of the passage 48 does not overlap with the heat-seal lands 43c in the thickness direction T. In addition, in another embodiment, the channel 48 does not extend in the longitudinal direction L but extends in the width direction W, or extends not only in the longitudinal direction L but also in the width direction W. In yet another embodiment, the channel 48 is one or more than three. In another embodiment, the channels 48 are formed in the first 1-absorption layers 41 without being formed in the first 2-absorption layers 42, or in addition to the first 2-absorption layers 42, the channels are formed in the first 1-absorption layers 41. In yet another embodiment, the channel 48 is not formed.

As described above, the 1 st and 2 nd water

absorbent materials

45 and 47 contain Super Absorbent Polymers (SAP). The super absorbent polymer is not particularly limited as long as it can absorb and retain water, and examples thereof include granular or fibrous super absorbent polymers. The basis weights of the super absorbent polymers of the 1 st water absorbent material 45 and the 2 nd water absorbent material 47 can be appropriately adjusted according to the absorption performance required for the pants-type diaper 1, but for example, the basis weights are each 10g/m²～500g/m²Preferably 100g/m²～400g/m². The basis weights of the 1 st water-absorbing material 45 and the 2 nd water-absorbing material 47 may be larger in one than the other, or may be larger in the otherThe two are equal. Wherein, the same means that one is in the range of 100% + -30% of the other. The 1 st water absorbent material 45 and the 2 nd water absorbent material 47 may further include hydrophilic fibers such as pulp fibers and water absorbent fibers. The proportion of the super absorbent polymer to the 1 st water absorbent material 45 and the 2 nd water absorbent material 47 is, for example, 80 to 100% by mass, preferably 90 to 100% by mass, and more preferably 95 to 100% by mass. Therefore, the 1 st water absorbent material 45 and the 2 nd water absorbent material 47 can be said to contain a super absorbent polymer as a main component, and the absorbent body 14 can be said to be a so-called SAP sheet. The proportion of the super absorbent polymer to the absorbent body 14 (including not only the 1 st and 2 nd water

absorbent materials

45 and 47 but also the adhesive, the 1 st base material 44, the intermediate layer 43, and the 2 nd base material 46) is, for example, 40 to 80% by mass, preferably 50 to 80% by mass, and more preferably 60 to 80% by mass. In the present embodiment, the 1 st water absorbent material 45 and the 2 nd water absorbent material 47 are composed of only a super absorbent polymer and do not contain hydrophilic fibers. In another embodiment, the 1 st water absorbent material 45 and the 2 nd water absorbent material 47 contain pulp fibers and/or water absorbent fibers in addition to the super absorbent polymer.

Examples of the super absorbent polymer include starch-based, cellulose-based, and synthetic polymer-based polymeric absorbents. Examples of the starch-based or cellulose-based super absorbent polymer include a starch-acrylic acid (salt) graft copolymer, a saponified product of a starch-acrylonitrile copolymer, and a crosslinked product of sodium carboxymethylcellulose. Examples of the synthetic polymer-based super absorbent polymer include polyacrylate-based, polysulfonate-based, maleic anhydride-based, polyacrylamide-based, polyvinyl alcohol-based, polyethylene oxide-based, polyaspartate-based, polyglutamate-based, polyalphamate-based, starch-based, and cellulose-based polymers. In the present embodiment, a polyacrylate-based (particularly, sodium polyacrylate-based) super absorbent polymer is preferable. In the present embodiment, it is preferable that 90 to 100 mass% of the superabsorbent polymer in the absorbent body 14 is composed of superabsorbent polymer particles having a particle diameter of 150 to 500 μm. The superabsorbent polymer particles having such a particle size distribution have a small and uniform particle size and are therefore easily retained in the adhesive. The particle diameter of the super absorbent polymer particles is measured in accordance with JIS R6002: the screening test method described in 1998 was standard.

The adhesive is not particularly limited as long as it can fix the super absorbent polymer, and examples thereof include a hot melt adhesive. The pattern of the adhesive to be applied is not particularly limited, but examples thereof include a continuous or intermittent Ω pattern, a spiral pattern, and a line pattern. The basis weight of the adhesive can be appropriately adjusted so as not to significantly reduce the liquid absorbency of the absorbent body 14, and for example, the basis weight of each layer of adhesive is 3g/m²～50g/m². Each layer is a layer of the adhesive between the 1 st water absorbent material 45 and the 1 st base 44, a layer of the adhesive between the 1 st water absorbent material 45 and the intermediate layer 43, a layer of the adhesive between the 2 nd water absorbent material 47 and the 2 nd base 46, and a layer of the adhesive between the 2 nd water absorbent material 47 and the intermediate layer 43.

The 1 st base material 44 is not particularly limited as long as it is a liquid-permeable sheet. Examples of the 1 st substrate 44 include a liquid-permeable nonwoven fabric, a hydrophilic nonwoven fabric, and a laminated nonwoven fabric thereof, and among them, a nonwoven fabric having high water permeability is preferable. Examples of the nonwoven fabric include a spunbond nonwoven fabric and a through-air nonwoven fabric formed of polyolefin fibers such as Polyethylene (PE) and polypropylene (PP), polyester fibers such as polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT) and polyethylene naphthalate (PEN), and a combination thereof. These fibers are preferably subjected to hydrophilization treatment by a known method. Alternatively, for example, an air-laid nonwoven fabric in which hydrophilic fibers such as pulp fibers and rayon fibers are coated with a hydrophilic binder, and a spunlace nonwoven fabric in which the hydrophilic fibers and the synthetic fibers are combined may be mentioned. In the present embodiment, an air-laid nonwoven fabric having liquid permeability and liquid retention properties, in which pulp fibers are coated with a hydrophilic binder, is used. In addition, the 1 st base material 44 may beOne or more types of the nonwoven fabrics are laminated in a plurality of layers. The weight per unit area of the 1 st substrate 44 is, for example, 10g/m²～100g/m²Preferably 20g/m²～80g/m². The thickness of the 1 st substrate 44 is, for example, 0.1mm to 5mm, preferably 0.15mm to 3 mm.

The 2 nd substrate 46 is not particularly limited as long as it is a sheet having water retentivity and liquid diffusibility. Examples of the 2 nd base 46 include nonwoven fabrics formed of synthetic fibers such as polyamide fibers, regenerated fibers such as rayon fibers and acetate fibers, natural fibers such as cotton, silk, hemp and pulp (cellulose) fibers, or a combination thereof. Specifically, for example, a spunbonded nonwoven fabric containing nylon and a spunlace nonwoven fabric containing rayon fibers and/or pulp fibers can be cited. The spun lace nonwoven fabric containing rayon fibers and/or pulp fibers may also contain polyolefin fibers and/or polyester fibers. In the present embodiment, a spunlace nonwoven fabric containing rayon fibers and pulp fibers, which has liquid retention and liquid diffusion properties, is used. Further, as the 2 nd base material 46, one kind or plural kinds of the above nonwoven fabrics may be laminated in plural. The weight per unit area of the 2 nd substrate 46 is, for example, 10g/m²～200g/m²Preferably 35g/m²～150g/m². The thickness of the 2 nd substrate 46 is, for example, 0.1mm to 5mm, preferably 0.15mm to 3 mm.

The intermediate layer 43 is not particularly limited as long as it is a liquid-permeable sheet. As the intermediate layer 43, for example, the same sheet as the 1 st substrate 44 can be used. The weight per unit area of the intermediate layer 43 is, for example, 10g/m²～100g/m²Preferably 15g/m²～80g/m². The thickness of the intermediate layer 43 is, for example, 0.1mm to 5mm, preferably 0.15mm to 3 mm.

In the present embodiment, as shown in fig. 3, the absorber 14 includes a back-side region BA, a stomach-side region FA, and a crotch region MA which are arranged in the longitudinal direction L. Here, the back-side area BA is an area of the absorbent body 14 that overlaps with the back-side portion 3 in the thickness direction T. The abdomen-side region FA is a region of the absorbent body 14 that overlaps the abdomen-side portion 2 in the thickness direction T. The crotch region MA is a region located between the back-side region BA and the stomach-side region FA of the absorber 14, i.e., a region overlapping the crotch portion 4 in the thickness direction T. Thus, the absorber 14 is divided into a back-side region BA overlapping the back-side portion 3, a stomach-side region FA overlapping the stomach-side portion 2, and a crotch region MA overlapping the crotch portion 4 along the longitudinal direction L.

In the present embodiment, the absorber 14 includes a high basis weight region 14a, a low basis weight region 14b, and a non-arrangement region 14 c. The high basis weight region 14a is a region in which the basis weight of the super absorbent polymer is high, and is a region in which the 1 st absorbent layer 41 and the 2 nd absorbent layer 42 overlap in the thickness direction T. The boundary between the high area weight region 14a and the low area weight region 14b is, for example, the outer edge of the first absorption layer 41 1. The low basis weight region 14b is a region in which the basis weight of the super absorbent polymer is low, and is a region in which the 1 st absorbent layer 41 is not present and only the 2 nd absorbent layer 42 is present in the thickness direction T. The boundary between the low area weight region 14b and the non-arrangement region 14c is, for example, the outer edge of the 2 nd absorption layer. The non-arrangement region 14c is a region not containing the super absorbent polymer, and is a region where the 1 st absorption layer 41 and the 2 nd absorption layer 42 are not present in the thickness direction T. The term "not containing a super absorbent polymer" includes the case where the weight per unit area of the super absorbent polymer is very small although the super absorbent polymer is present. "very small" means that the weight per unit area of the super absorbent polymer is 5% or less of the weight per unit area of the super absorbent polymer in the high weight-per-unit-area region 14 a. The high area weight region 14a, the low area weight region 14b, and the non-arrangement region 14c have substantially rectangular shapes. However, the shape is not particularly limited, and examples thereof include a rectangle having a short side projecting in an arc shape, a rounded rectangle, an ellipse, and an hourglass shape. In addition, the low basis weight region 14b is a region that surrounds the periphery of the high basis weight region 14a (surrounds at least three sides) in a substantially frame shape in the longitudinal direction L and the width direction W in a plan view, and the outer dimension of the low basis weight region 14b is 5% to 25% larger than the outer dimension of the high basis weight region 14 a. The non-arrangement region 14c is a region surrounding the low basis weight region 14b in a substantially frame shape, and the outer dimension of the non-arrangement region 14c is 3% to 15% larger than the outer dimension of the low basis weight region 14 b. The weight per unit area of the low area weight region 14b is, for example, 40% to 60% of the weight per unit area of the high area weight region 14a, and the weight per unit area of the non-arrangement region 14c is, for example, 0% to 5% of the weight per unit area of the high area weight region 14 a. In the case where the absorbent body 14 is not provided with the 1 st absorbent layer 41 and the 2 nd absorbent layer 42 but is formed of one layer, and the like, it is difficult to distinguish the two regions, the high basis weight region is a region in which the thickness of the water absorbent material (including the adhesive) is in a range from the maximum value to 50% of the maximum value. The low basis weight portion is a region in which the thickness of the water-absorbent material (including the adhesive) is in a range from 50% to 5% of the maximum value, and the non-arrangement region is a region in which the thickness of the water-absorbent material (including the adhesive) is in a range from 5% to 0% of the maximum value. The thickness is an arithmetic average height (Ra: JIS B0601-2001).

Thus, in the absorber 14, the back-side region BA includes a back-side high area-weight region BAa as the high area-weight region 14a, a back-side low area-weight region BAb as the low area-weight region 14b, and a back-side non-arrangement region barc as the non-arrangement region 14 c. In addition, in the absorbent body 14, the ventral region FA includes ventral high basis weight regions FAa as the high basis weight regions 14a and ventral non-disposed regions FAc as the non-disposed regions 14 c. In addition, the crotch region MA has only the high area weight region 14 a. Therefore, the basis weights of the super absorbent polymers in the back-side high basis weight region BAa and the stomach-side high basis weight region FAa are equivalent to the basis weight of the super absorbent polymer in the crotch region MA. "equivalent" means that one is in the range of 0.7 to 1.3 times (100% ± 30%) the other. In another embodiment, the ventral region FA includes a ventral low basis weight region FAb as the low basis weight region 14b in addition to the ventral high basis weight region FAa and the ventral non-disposition region FAc.

Here, the 2 nd absorbent layer 42 includes a protruding portion protruding outward from the end edge of the 1 st absorbent layer 41 at the rear end in the longitudinal direction L in a plan view. The protruding portion includes a back-side low area weight region BAb, and in the present embodiment, the protruding portion is the same as the back-side low area weight region BAb. The 2 nd absorbent layer 42 is covered with the intermediate layer 43, and thus the protruding portion, i.e., the skin side of the back-side low basis weight region BAb is covered with the intermediate layer 43 and the 1 st base material 44. In the present embodiment, the 2 nd absorbent layer 42 includes, in a plan view, widthwise protruding portions protruding outward from the end edges of the 1 st absorbent layer 41 at both ends in the widthwise direction L. The skin side of the widthwise protruding portion is covered with the intermediate layer 43 and the 1 st base material 44. In another embodiment, the 2 nd absorbent layer 42 includes another protruding portion protruding outward from the end edge of the 1 st absorbent layer 41 at the front end portion in the longitudinal direction L in a plan view. The other protrusion includes a ventral low basis weight region. In still another embodiment, the protruding portion, i.e., the skin side of the back-side low area weight region BAb is covered by one of the intermediate layer 43 and the 1 st base material 44, but not by the other. In still another embodiment, the 2 nd absorbent layer 42 does not include a width direction protruding portion protruding outward from the end edge of the 1 st absorbent layer 41 at both side end portions in the width direction W in a plan view.

In the present embodiment, in the absorber 14, db2> dc2> da2 (or b > c > a) when the length of the back-side high area-weight region BAa is da2 (or a), the length of the back-side low area-weight region BAb is db2 (or b), and the length of the back-side non-disposition region barc is dc2 (or c) in the longitudinal direction L. That is, in the back-side area BA, the length of the back-side low area weight area BAb is made relatively long, and the superabsorbent polymer is arranged to the rear side in the longitudinal direction L while keeping the basis weight of the superabsorbent polymer low as a whole.

In the present embodiment, in the absorber 14, da1> dc1 where da1 represents the length of the abdomen-side high basis weight region FAa and dc1 represents the length of the abdomen-side non-arrangement region FAc in the longitudinal direction L. That is, in the abdomen-side region FA, the length of the abdomen-side high basis weight region FAa is relatively long, and the basis weight of the super absorbent polymer on the abdomen side where the excretion amount is large is increased.

In the present embodiment, dc2> dc1 in the longitudinal direction L in the absorber 14. The length of the back-side non-arrangement region barc is made relatively long, the amount of the superabsorbent polymer used in the back-side region BA with a small excretion amount is kept low, and the length of the abdomen-side non-arrangement region FAc is made relatively short, so that the basis weight of the superabsorbent polymer in the abdomen-side region FA with a large excretion amount is increased.

In addition, in another embodiment, da2+ db2> da1 in the longitudinal direction L in the absorber 14. In this case, the super absorbent polymer is disposed in the back area BA up to the more rear side in the longitudinal direction L.

In the present embodiment, the amount of the super absorbent polymer used in the ventral high basis weight region FAa is greater than the sum of the amount of the super absorbent polymer used in the back high basis weight region BAa and the amount of the super absorbent polymer used in the back low basis weight region BAb. The amount of superabsorbent polymer used in the back-side area BA where the excretion amount is small is suppressed to be low, and the amount of superabsorbent polymer used in the stomach-side area FA where the excretion amount is large is increased.

In the present embodiment, a printed film (not shown) is disposed between the back portion 3 and the back area BA of the absorbent body 14. The printed film is provided with a design or pattern on the outside through the cover sheet 5 of the back side portion 3.

Fig. 4 is a partially enlarged plan view of the pants-type diaper according to the embodiment including the back side portion 3. In the present embodiment, the back portion 3 has a back-side low stretchable region 31 having low stretchability in the width direction W and a pair of back-side high

stretchable regions

32, 32 having high stretchability in the width direction W. The back-side low stretch region 31 is located at the center of the back-side portion 3 in the width direction W and extends rearward from the front end edge in the longitudinal direction L. The pair of back-side

high stretch regions

32 and 32 are adjacent to the back-side low stretch region 31 on both sides in the width direction W. The back-side low stretch region 31 has an elongation against a predetermined tensile force in the width direction W ((length after elongation-original length)/(original length)) of 1/3 or less, preferably 1/5 or less, and more preferably 1/10 or less of the elongation in the width direction W of the back-side high stretch region 32. For example, the back-side low stretch region 31 is a region where there is no elastic member that stretches and contracts in the width direction W, or a region where, although there is an elastic member, the elastic member does not function as an elastic member much (does not stretch and contract much). On the other hand, the back-side high stretch region 32 is a region where the elastic member 7a that stretches and contracts in the width direction W is present. Therefore, the back-side high stretch region 32 and the back-side low stretch region 31 are defined by a region where the elastic member 7a capable of functioning as an elastic member is present and a region where the elastic member capable of functioning as an elastic member is not present. In addition, the lower stretchability includes the case of no stretchability. The stretchability of each stretchable region is determined based on the stretchability of the elastic member.

In the present embodiment, the rear portion of the passage 48 in the longitudinal direction L overlaps with the rear low expansion and contraction region 31 in the thickness direction T. In addition, in a plan view, the inner end edge K1 in the width direction W of each of the pair of back-side highly

stretchable regions

32, 32 is located between the end edge 14EW opposing the back-side highly stretchable region 32 in the width direction W of the absorbent body 14 and (the end edge 48E in the width direction W of) the channel 48. The end edge K1 is substantially an inner end edge of the elastic member 7a in the width direction W. Therefore, the central portion in the width direction W of the absorbent body 14 including the portion on the rear side in the longitudinal direction L of the channel 48 is hardly elongated in the width direction W by the back-side low stretch region 31, and both end portions in the width direction W are elongated in the width direction W by the pair of back-side

high stretch regions

32, 32.

In the present embodiment, in a plan view, the inner end edge K1 in the width direction W of each of the pair of back-side highly

stretchable regions

32, 32 is closer to the end edge 48E in the width direction W of the channel 48 than the end edge 14EW opposing the back-side highly stretchable region 32 in the width direction W of the absorbent body 14. Thus, both end portions in the width direction W in the absorbent body 14 including the rear side portion in the longitudinal direction L of the channel 48 are more elongated in the width direction W by the pair of back-side highly

stretchable regions

32, 32.

In the present embodiment, the back portion 3 further has another back-side high-stretchability region 34 exhibiting high stretchability in the width direction W. The other back-side high stretchable region 34 is adjacent to the pair of back-side high

stretchable regions

32, 32 and the back-side low stretchable region 31 on the rear side in the longitudinal direction L in a plan view. The other back-side high stretch region 34 is a region having an elastic modulus in the width direction W substantially equal to that of the back-side high stretch region 32. The other backside high stretch region 34 is defined as a region where the elastic member 7b exists. Therefore, the rear end portion in the longitudinal direction L of the back portion 3 is easily pressed against the back of the wearer by the other rear highly stretchable region 34.

In the present embodiment, in the back portion 3, the rear end portion 31E of the back-side low-stretchability region 31 in the longitudinal direction L is located further to the rear side in the longitudinal direction L than the rear end portion of the duct 48 in the longitudinal direction L. Therefore, the rear end of the absorbent body 14 in the longitudinal direction L is less likely to be pressed against the back of the wearer by the rear low stretch region 31.

In the present embodiment, the inner end of the back-side high-stretch region 32 in the width direction W overlaps the fixing region 15 in the thickness direction T. Therefore, the fixed region 15 is likely to be elongated at least toward the outside in the width direction W by the back-side high-stretch region 32.

In the present embodiment, the back-side low stretchable region 31 of the back-side portion 3 overlaps the back-side low area weight region BAb and the back-side high area weight region BAa in a plan view. The ventral low expansion region 36 of the ventral portion 2 overlaps with the ventral high basis weight region FAa in plan view. Therefore, since each of the high and low basis weight regions can be suppressed from shrinking in the width direction W, a decrease in absorption performance due to shrinkage of the absorbent body 14 can be suppressed.

In the present embodiment, the other back side high stretch region 34 of the back side portion 3 overlaps with a region of the absorbent body 14 that is further outside in the longitudinal direction L than the back side low basis weight region BAb. The other abdominal-side high stretch region 39 of the abdominal portion 2 overlaps with a region of the absorbent body 14 that is located further outward in the longitudinal direction L than the abdominal-side high basis weight region FAa. Therefore, by the contraction of the other

high stretch regions

34 and 39, the portion of the back side portion 3 located outside the high/low basis weight region of the absorbent body 14 in the longitudinal direction L and the portion of the stomach side portion 2 located outside the high/low basis weight region of the absorbent body 14 in the longitudinal direction L can be further pulled in the width direction, and the portions can be further pressed toward the skin side.

Fig. 5 is a partially enlarged plan view of the abdomen-containing portion 2 of the pants-type diaper according to the embodiment. In the present embodiment, the ventral portion 2 is substantially the same as the dorsal portion 3. That is, the ventral portion 2 has a ventral low-stretchability region 36 having a low stretchability in the width direction W and a pair of ventral high-

stretchability regions

37 and 37 having a high stretchability in the width direction W. The ventral low expansion region 36 is located at the center of the ventral portion 2 in the width direction W, and extends from the rear end edge in the longitudinal direction L to the front side. The pair of abdominal side

high stretch regions

37, 37 are adjacent to both sides of the abdominal side low stretch region 36 in the width direction W. The abdominal-side low stretch region 36 has an elongation against a predetermined tensile force in the width direction W ((length after elongation-original length)/(original length)) of 1/3 or less, preferably 1/5 or less, and more preferably 1/10 or less of the elongation in the width direction W of the abdominal-side high stretch region 37. For example, the abdominal-side low stretch region 36 is a region where there is no elastic member that stretches in the width direction W, or a region where, although there is an elastic member, the elastic member does not function as an elastic member much (does not stretch much). On the other hand, the ventral high-stretch region 37 is a region where the elastic member 6a is stretched in the width direction W. Therefore, the abdominal side high stretch region 37 and the abdominal side low stretch region 36 are defined by the region where the elastic member 6a capable of functioning as an elastic member is present and the region where the elastic member capable of functioning as an elastic member is absent. The stretchability of each stretchable region is determined based on the stretchability of the elastic member.

In the present embodiment, the front portion of the channel 48 in the longitudinal direction L overlaps the ventral low expansion region 36 in the thickness direction T. In addition, in a plan view, the inner end edge K2 in the width direction W of each of the pair of abdomen-side

high stretch regions

37, 37 is positioned between the end edge 14EW opposing the abdomen-side high stretch region 37 in the width direction W of the absorbent body 14 and (the end edge 48E in the width direction W of) the channel 48. The end edge K2 is substantially an inner end edge of the elastic member 6a in the width direction W. Therefore, the central portion in the width direction W of the absorbent body 14 including the front portion in the longitudinal direction L of the channel 48 is hardly expanded and contracted in the width direction W by the abdomen-side low stretch region 36, and both end portions in the width direction W are expanded in the width direction W by the pair of abdomen-side

high stretch regions

37, 37.

In the present embodiment, in a plan view, the distance between the inner end edges K2, K2 in the width direction W of the pair of abdominal side

high stretching regions

37, 37 is equal to the distance between the inner end edges K1, K1 in the width direction W of the pair of back side

high stretching regions

32, 32. In another embodiment, the distance between the inner end edges K2, K2 in the width direction W of the pair of abdominal side highly

stretchable regions

37, 37 is shorter than the distance between the inner end edges K1, K1 in the width direction W of the pair of back side highly

stretchable regions

32, 32 in a plan view. In this case, both end portions in the width direction W of the front portion in the longitudinal direction L of the absorbent body 14 are further extended in the width direction W by the pair of abdomen-side

high stretch regions

37, 37.

In the present embodiment, the ventral portion 2 further has another ventral high-stretchability region 39 exhibiting high stretchability in the width direction W. The other abdominal side high stretch region 39 is adjacent to the pair of abdominal side

high stretch regions

37, 37 and the abdominal side low stretch region 36 on the front side in the longitudinal direction L. The other abdominal side high stretch region 39 has an elastic modulus in the width direction W substantially equal to that of the abdominal side high stretch region 37. The other ventral high stretch region 39 is defined as a region where the elastic member 6b is present. Therefore, the front end of the abdominal section 2 in the longitudinal direction L is easily pressed against the abdomen of the wearer by the other abdominal high stretch region 39.

Next, a method for producing the absorbent body 14 will be described.

First, the sheet for the 2 nd substrate 46 is moved in the longitudinal direction L, and the hot melt adhesive is applied onto the sheet for the 2 nd substrate 46. Next, a super absorbent polymer was sprayed from a super absorbent polymer supply device onto both end portions and a central portion in the width direction W of the sheet for the 2 nd substrate 46 coated with the hot melt adhesive along the length direction L, respectively. At this time, a small amount of the super absorbent polymer is transferred to the region (corresponding to the channel) between the both end portions and the central portion. Next, a sheet for the intermediate layer 43 coated with hot melt adhesive on both sides was laminated on the super absorbent polymer on the sheet for the 2 nd substrate 46. Next, the laminate was moved in the longitudinal direction L, and a super absorbent polymer was sprayed from another super absorbent polymer supply device in the longitudinal direction L onto the central portion in the width direction W of the sheet for the intermediate layer 43 coated with the hot melt adhesive. Next, the sheet for the 1 st substrate 44 coated with the hot melt adhesive was laminated on the super absorbent polymer on the sheet for the intermediate layer 43 so that the hot melt adhesive was located on the super absorbent polymer side. Then, both side portions in the width direction W of the sheet for the 2 nd base material 46 were folded back onto both side portions in the width direction W of the sheet for the 1 st base material 44 to obtain a laminate. After that, the thickness of the laminate is adjusted by passing the laminate through a pair of press rolls, i.e., pressing, to obtain the absorbent body 14.

Next, a method for manufacturing a pants-type diaper using the absorbent body 14 will be described.

A liquid-permeable front sheet 12 is attached to the upper surface (the surface of the 1 st base 44) of the absorber 14 produced as described above, and a liquid-impermeable back sheet 13 is attached to the lower surface (the surface of the 2 nd base 46) of the absorber 14, thereby obtaining a laminate. Next, the side sheets 17 with the leakage preventing walls 16 are attached to both sides in the width direction W of the laminate to obtain the absorbent main body 10. Thereafter, the absorbent body 10 is attached to the cover sheet 5 (including the elastic members 6, 7, and 8), and both

ends

2a and 2a in the width direction W of the abdomen-side portion 2 and both

ends

3a and 3a in the width direction W of the back-side portion 3 are joined. Thereby, the pants-type diaper 1 is manufactured.

Effects of the pants-type diaper according to the embodiment will be described. In general, an absorbent body in which a super absorbent polymer is substantially uniformly arranged in a flat shape is used in a pants-type diaper. In this case, a super absorbent polymer having a predetermined basis weight such that liquid (exemplified by urine) to be excreted does not leak is disposed in the crotch region of the absorbent body. Correspondingly, the superabsorbent polymer having the predetermined basis weight is also disposed in the abdominal region and the back region, which are regions of the absorbent body other than the crotch region. The back-side region and the abdomen-side region of the absorber are in close contact with the skin of the wearer by the back-side portion and the abdomen-side portion of the pants-type diaper. In this case, if the superabsorbent polymer in the back-side region and the stomach-side region has the same predetermined basis weight as the superabsorbent polymer in the crotch region, that is, the back-side region and the stomach-side region have the same thickness, the back-side region and the stomach-side region are too thick to be easily pulled into the skin surface on the back side and the stomach side of the wearer. In this case, the wearer may feel uncomfortable to the absorbent body when wearing the absorbent article, and the fit may be reduced. In this case, the absorption performance of at least the crotch region tends to be reduced when the entire absorbent body is made thin. In this case, leakage may occur from the ends in the width direction and the ends in the longitudinal direction.

On the other hand, in the pants-type diaper 1 of the present embodiment, the absorbent body 14 has a relatively high weight per unit area of the superabsorbent polymer in the crotch region MA, and a relatively low weight per unit area of the superabsorbent polymer in the low weight per unit area of at least one of the back-side region BA and the stomach-side region FA. Therefore, since a relatively large amount of super absorbent polymer is disposed in the crotch region MA where liquid absorption is required, the absorbent body 14 can reliably absorb liquid (exemplified by urine) without leakage while ensuring absorption performance. On the other hand, by arranging the super absorbent polymer in a small amount in the low basis weight region of at least one of the abdomen-side region FA and the back-side region BA, which is not required to absorb liquid, the region can be made thin. Therefore, when the stomach-side portion 2 or the back-side portion 3 corresponding to this region is brought into close contact with the skin surface of the wearer, the absorbent body 14 can be made less likely to stick to the skin surface. This makes it difficult for the wearer to feel a sense of discomfort with respect to the absorbent body, and improves the fit. Thus, in the pants-type diaper including the super absorbent polymer, the absorption performance can be ensured and the fit can be improved.

In the present embodiment, as a preferable mode, a back side high area weight region BAa in which the weight per unit area of the super absorbent polymer is relatively high is provided between the crotch region MA and the back side low area weight region BAb. Therefore, more liquid can be easily collected in the back-side high area-weight region BAa before the liquid reaches the back-side low area-weight region BAb. This can reduce the amount of liquid that migrates and diffuses into the back-side low basis weight region BAb where the basis weight of the superabsorbent polymer is low, and can suppress leakage of liquid from the end portion on the back side in the longitudinal direction L of the pants-type diaper 1, thereby ensuring more reliable absorption performance.

In the present embodiment, as a preferable mode, the backside non-arrangement region barc including no super absorbent polymer (including not only the case where the weight per unit area is zero but also the case where the weight per unit area is 5% or less of the weight per unit area of the backside high weight-per-unit-area region BAa) is provided at a position outside the backside low weight-per-unit-area region BAb in the longitudinal direction L. That is, since the back-side non-arrangement region barc can be made thinner by arranging the superabsorbent polymer less in the back-side non-arrangement region barc, the portion of the back-side portion 3 corresponding to the back-side non-arrangement region barc can be made more closely to the skin surface of the wearer, and (the back-side non-arrangement region barc of) the absorbent body can be made less likely to slip into the skin surface. Also, the super absorbent polymer which hardly contributes to the absorption of liquid can be reduced. This ensures absorption performance and improves the adhesiveness, and the super absorbent polymer can be used efficiently.

In the present embodiment, as a preferable mode, the relationship between the length a of the back-side high area-weight region BAa, the length b of the back-side low area-weight region BAb, and the length c of the back-side non-arrangement region barc is b > c > a. Therefore, by making the length (a) of the back-side high basis weight region BAa, i.e., the region having the largest thickness, the shortest in the longitudinal direction L, it is possible to suppress the penetration of the back-side portion 3 into the skin surface when it is in close contact with the skin surface to a narrow range. This makes it more difficult for the wearer to feel a sense of discomfort when wearing the garment. Further, by making the length (b) of the back-side low basis weight region BAb, i.e., the region having the middle thickness, the longest, it is possible to easily and reliably collect the liquid and to suppress the penetration into the skin surface to a smaller extent. This ensures more reliable absorption performance and improves the adhesion.

In the present embodiment, as a preferable mode, the length of the abdomen-side non-arrangement region FAc in which the weight per unit area of the superabsorbent polymer in the abdomen-side region FA is relatively low is made shorter than the length of the back-side non-arrangement region barc in which the weight per unit area of the superabsorbent polymer in the back-side region BA is relatively low in the longitudinal direction L. This ensures that the volume capable of absorbing liquid is large on the ventral side where liquid spreads more than on the dorsal side. This ensures absorption performance without leakage and reliably absorbs liquid.

In the present embodiment, it is preferable that the abdomen-side region FA has a low basis weight region having a low basis weight of the super absorbent polymer and a high abdomen-side high basis weight region FAa having a high basis weight of the super absorbent polymer. This ensures that the volume capable of absorbing liquid is large on the ventral side where liquid spreads more than on the dorsal side. Therefore, the liquid can be reliably absorbed without leakage while ensuring the absorption performance.

In the present embodiment, as a preferable mode, the amount of the super absorbent polymer used in the abdomen-side high basis weight region FAa is larger than that in a region in which the back-side high basis weight region BAa and the back-side low basis weight region BAb are combined. Therefore, the volume capable of absorbing the liquid can be secured to be larger on the abdomen side where the liquid spreads more than on the back side. Therefore, the liquid can be reliably absorbed without leakage while ensuring the absorption performance.

In the present embodiment, in a preferred mode, the combined length of the back-side high area-weight region BAa and the back-side low area-weight region BAb is longer than the length of the stomach-side high area-weight region FAa. Therefore, in the back side where conduction leakage of liquid is likely to occur as compared with the ventral side, a region where liquid can be collected can be ensured longer in the back side. Therefore, the liquid can be reliably absorbed without leakage over a wide range of absorption performance.

In the present embodiment, as a preferable mode, the low expansion/contraction region 31 of the back side portion 3 overlaps the back side low basis weight region BAb and the back side high basis weight region BAa, and the low expansion/contraction region 36 of the stomach side portion 2 overlaps the stomach side high basis weight region FAa. This can suppress contraction of the back-side high unit area weight region BAa, the stomach-side high unit area weight region FAa, and the back-side low unit area weight region BAb in the width direction W, and therefore can suppress a decrease in absorption performance due to contraction of the absorbent body 14.

In the present embodiment, as a preferable mode, the other high stretch region 34 of the back side portion 3 overlaps a region of the absorbent body 14 that is located outside the back side low basis weight region BAb in the longitudinal direction L, and the other high stretch region 39 of the stomach side portion 2 overlaps a region of the absorbent body 14 that is located outside the stomach side high basis weight region FAa in the longitudinal direction L. Thus, by the contraction of the other

high stretch regions

34 and 39, the portion of the back portion 3 located outside the low basis weight region BAb of the absorbent body 14 in the longitudinal direction L and the portion of the stomach portion 2 located outside the high basis weight region FAa of the absorbent body 14 in the longitudinal direction L can be pulled further in the width direction W, and can be pressed further toward the skin side. This enables both end portions of the absorbent body 14 in the longitudinal direction L to be more closely attached to the skin surface.

In the present embodiment, as a preferable mode, the absorber 14 has a double-layer structure in which the 1 st absorption layer 41 and the 2 nd absorption layer 42 are laminated, and the low basis weight region (exemplified as the back-side low basis weight region BAb) includes a protruding portion protruding outward from the end edge of the 1 st absorption layer 41 in the end portion of the 2 nd absorption layer 42 in a plan view. Therefore, the thickness of the low basis weight region can be reliably reduced. Thus, when the stomach-side portion 2 or the back-side portion 3 corresponding to the low basis weight region is brought into close contact with the skin surface of the wearer, the low basis weight portion can be made less likely to stick to the skin surface. This makes it difficult for the wearer to feel uncomfortable, and improves the fit.

In the present embodiment, as a preferred mode, the intermediate layer 43 of nonwoven fabric is provided on the skin side of the 2 nd absorbent layer 42, and the skin side surface of the low basis weight region (exemplified by the rear side low basis weight region BAb) is covered with the nonwoven fabric (intermediate layer 43). Therefore, when the back portion 3 is in close contact with the skin surface, even if the low basis weight region of the absorbent body 14 is pressed against the skin surface, the skin surface of the low basis weight region is covered with the nonwoven fabric, and therefore, the unevenness due to the super absorbent polymer is not felt, and the uncomfortable feeling during wearing can be hardly felt. This can suppress a decrease in adhesion.

In the present embodiment, as a preferable mode, the print film is disposed between the back side region, which has a relatively thin back side low basis weight portion, and the back side portion. Therefore, the thickness of the entire portion (back region + printed film) sandwiched between the back side portion and the skin surface can be reduced when worn. Thus, when the back side portion is brought into close contact with the skin surface, the thickness of the printed film is not felt, and a feeling of discomfort in wearing can be hardly felt. This can suppress a decrease in adhesion.

The pants-type diaper of the present invention and the absorber thereof are not limited to the above-described embodiments, and known techniques can be applied by combining the embodiments without departing from the object and spirit of the present invention.

Claims

1. A pants-type diaper having a longitudinal direction, a width direction, and a thickness direction which are orthogonal to each other, comprising a front side portion, a back side portion, and an absorbent main body which is positioned between the front side portion and the back side portion and which includes an absorber,

the absorbent body comprises a super absorbent polymer and is provided with a back region, a stomach region and a crotch region which are arranged along the longitudinal direction,

the back-side region overlaps with the back-side portion in the thickness direction,

the ventral region and the ventral portion overlap in the thickness direction,

the crotch region is located between the back-side region and the stomach-side region,

at least one of the back-side region and the stomach-side region includes a low basis weight region in which a basis weight of the super absorbent polymer is lower than a basis weight of the super absorbent polymer in the crotch region.

2. The pant-type diaper according to claim 1,

the backside region has:

a backside low basis weight region as the low basis weight region; and

a back-side high basis weight region located between the crotch region and the back-side low basis weight region in the longitudinal direction, the superabsorbent polymer having a basis weight equivalent to that of the crotch region.

3. The pant-type diaper according to claim 2,

the back-side region has a back-side non-disposed region that is adjacent to the back-side low area-weight region on a side opposite to the back-side high area-weight region across the back-side low area-weight region in the longitudinal direction and that does not contain the super absorbent polymer.

4. The pant-type diaper according to claim 3,

in the longitudinal direction, when the length of the back-side high area-weight region is a, the length of the back-side low area-weight region is b, and the length of the back-side non-arrangement region is c, the b > the c > the a.

5. The pant-type diaper according to claim 3 or 4,

the front end of the ventral region in the longitudinal direction has a ventral non-distribution region in which the weight per unit area of the superabsorbent polymer is equal to the weight per unit area of the superabsorbent polymer in the back non-distribution region,

the length of the ventral-side non-arrangement region is shorter than the length of the dorsal-side non-arrangement region in the longitudinal direction.

6. The pant-type diaper according to any one of claims 2 to 4, wherein,

the abdomen-side region does not have the low basis weight region, but has an abdomen-side high basis weight region adjacent to the crotch region in the longitudinal direction, and the weight per unit area of the superabsorbent polymer in the abdomen-side high basis weight region is equal to the weight per unit area of the superabsorbent polymer in the crotch region.

7. The pant-type diaper according to claim 6,

the amount of the superabsorbent polymer used in the high basis weight region on the ventral side is greater than the sum of the amount of the superabsorbent polymer used in the high basis weight region on the back side and the amount of the superabsorbent polymer used in the low basis weight region on the back side.

8. The pant-type diaper according to claim 6,

the combined length of the back-side high basis weight region and the back-side low basis weight region is longer than the length of the abdomen-side high basis weight region in the longitudinal direction.

9. The pant-type diaper according to claim 6,

the dorsal portion and the ventral portion each have:

a low stretch region located at a central portion in the width direction, extending outward from an inner end edge in the longitudinal direction, and having low stretchability in the width direction; and

a pair of high-stretchability regions adjacent to the low-stretchability region on both sides in the width direction, the high-stretchability region having a high stretchability in the width direction,

the low stretch region of the back side portion overlaps the back side low area weight region and the back side high area weight region in a plan view,

the low expansion/contraction region of the ventral portion overlaps with the high basis weight region of the ventral portion in a plan view.

10. The pant-type diaper according to claim 9,

the dorsal portion and the ventral portion each further have another high-stretchability region adjacent thereto on the outer side in the longitudinal direction of the pair of high-stretchability regions and the low-stretchability region, and showing a high stretchability in the width direction,

the other high stretch region of the back portion overlaps with a region of the absorbent body that is further outside in the longitudinal direction than the back-side low basis weight region,

the other high stretch region of the abdomen-side portion overlaps with a region of the absorbent body located more outward in the longitudinal direction than the abdomen-side high basis weight region.

11. The pants-type diaper according to any one of claims 1 to 4,

the absorbent body further includes:

1 st absorption layer comprising the superabsorbent polymer; and

a2 nd absorbing layer which is located on one side in the thickness direction of the 1 st absorbing layer and contains the super absorbent polymer,

wherein at least one of both ends of the 2 nd absorbent layer in the longitudinal direction includes a protruding portion protruding outward from an end edge of the 1 st absorbent layer in a plan view,

the protrusions comprise the low area weight regions.

12. The pant diaper according to claim 11,

the 2 nd absorbent layer is positioned on the non-skin side of the 1 st absorbent layer,

the absorbent body further comprises an intermediate layer, which is formed of a nonwoven fabric, between the 1 st and 2 nd absorbent layers,

the skin-side surface of the low area weight region is covered with the intermediate layer.

13. The pants-type diaper according to any one of claims 1 to 4,

the pant diaper further comprises a printed film between the back side portion and the back side region,

the back-side region includes a back-side low-basis-weight region in which the weight per unit area of the super absorbent polymer is lower than the weight per unit area of the super absorbent polymer in the crotch region.