CN114522026B

CN114522026B - Absorbent article

Info

Publication number: CN114522026B
Application number: CN202011581602.2A
Authority: CN
Inventors: 槙秀晃; 黄泽波; 何丹秀; 郭晓彤; 南保勇辉; 泷野俊介
Original assignee: Unicharm Corp
Current assignee: Unicharm Corp
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2023-09-19
Anticipated expiration: 2040-12-28
Also published as: WO2022145133A1; CN114522026A

Abstract

The invention provides an absorbent article having flexibility and reduced mounting discomfort. The absorbent article (1) is provided with: an absorbent core (10); a liquid-permeable sheet (2) which is disposed closer to the skin than the absorbent core (10); and a liquid-impermeable sheet (3) which is disposed on the non-skin side of the absorbent core (10), wherein the absorbent article (1) has a plurality of nonwoven fabrics (4, 5) disposed on the non-skin side of the liquid-impermeable sheet (3), and has a 1 st region (R1) which overlaps at least part of the absorbent core (10) in the thickness direction and a 2 nd region (R2) which is located on the outer side of the 1 st region (R1) in the width direction and does not overlap the absorbent core (10) in the thickness direction, and the number of nonwoven fabrics (4, 5) disposed in the 1 st region (R1) is greater than the number of nonwoven fabrics (4, 5) disposed in the 2 nd region (R2).

Description

Absorbent article

Technical Field

The present invention relates to an absorbent article.

Background

Patent document 1 discloses an absorbent article comprising a front sheet, a back sheet, and an absorber disposed between the front sheet and the back sheet. For the purpose of improving the softness (cushioning property) of the non-skin side of the absorbent article, the back sheet of patent document 1 includes a liquid-impermeable inner sheet and an outer sheet disposed on the non-skin side of the inner sheet and having a plurality of raised fibers on one surface. If the softness of the non-skin side of the absorbent article is good, a user who touches the absorbent article from the outside will be aware that this is a soft, comfortable-to-wear product.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open No. 2020-74858

Disclosure of Invention

Problems to be solved by the invention

However, even if raised fibers are provided in the outer sheet, the raised fibers are easily crushed when they are thin, and it is difficult to improve flexibility (cushioning properties). In the absorbent article of patent document 1, the back sheet having fluffy raised fibers forms the outer shape of the absorbent article. Therefore, the wearer's legs may come into contact with the bulky back sheet, which may give the wearer a sense of discomfort (stiffness).

The present invention has been made in view of the above-described problems, and an object thereof is to provide an absorbent article having flexibility and reduced mounting discomfort.

Solution for solving the problem

The main means for achieving the above object is an absorbent article comprising a longitudinal direction, a width direction, and a thickness direction, and having an absorbent core, a liquid-permeable sheet disposed on the skin side of the absorbent core, and a liquid-impermeable sheet disposed on the non-skin side of the absorbent core, wherein the absorbent article comprises a plurality of nonwoven fabrics disposed on the non-skin side of the liquid-impermeable sheet, and further comprises a 1 st region and a 2 nd region, wherein the 1 st region overlaps at least a part of the absorbent core in the thickness direction, and the 2 nd region is located on the outer side of the 1 st region in the width direction and does not overlap the absorbent core in the thickness direction, and the number of the nonwoven fabrics disposed in the 1 st region is larger than the number of the nonwoven fabrics disposed in the 2 nd region.

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

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, an absorbent article having flexibility and reduced mounting discomfort can be provided.

Drawings

Fig. 1 is a plan view of a tape type disposable diaper 1 in an extended and stretched state as seen from the skin side.

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

Fig. 3 is a schematic cross-sectional view at line AA in fig. 1.

Fig. 4 is an explanatory diagram of the 1 st region R1 and the 2 nd region R2.

Fig. 5 is an explanatory diagram of the high-density portion 40.

Fig. 6A and 6B are explanatory views of the high-density portion 40.

Fig. 7A and 7B are schematic cross-sectional views of a diaper 1 according to a modification.

Fig. 8A is a schematic perspective view of the pants-type diaper 50, and fig. 8B is a plan view of the pants-type diaper 50 in an extended and stretched state, as viewed from the non-skin side.

Description of the reference numerals

1. (tape) diapers (absorbent articles); 2. surface sheet (liquid-permeable sheet); 3. leakage-proof sheet (liquid-impermeable sheet); 4. 1 st nonwoven fabric (nonwoven fabric); 5. 2 nd nonwoven fabric (nonwoven fabric); 6. a side panel; 7. leg elastic members; 8. a waist elastic member; 10. an absorbent core; 11. core wrapping sheets; 20. a three-dimensional pleat portion; 21. an elastic member; 30. a sticking buckle belt; 40. a high-density portion; 50. underpants type diapers (absorbent articles); 51. a joint; 52. an absorbent body; 53. an exterior member; 531. 1 st nonwoven fabric (nonwoven fabric); 532. 2 nd nonwoven fabric (nonwoven fabric); r1, region 1; r2, region 2.

Detailed Description

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

An absorbent article comprising a longitudinal direction, a width direction, and a thickness direction, and having an absorbent core, a liquid-permeable sheet disposed on the skin side of the absorbent core, and a liquid-impermeable sheet disposed on the non-skin side of the absorbent core, wherein the absorbent article comprises a plurality of nonwoven fabrics disposed on the non-skin side of the liquid-impermeable sheet, and comprises a 1 st region overlapping at least a part of the absorbent core in the thickness direction and a 2 nd region located on the outer side of the 1 st region in the width direction and not overlapping the absorbent core in the thickness direction, wherein the number of nonwoven fabrics disposed in the 1 st region is greater than the number of nonwoven fabrics disposed in the 2 nd region.

With such an absorbent article, the softness (cushioning property) of the non-skin side portion of the 1 st region where the absorbent core is disposed is preferable, so that the hardness of the absorbent core is not easily perceived by a user who touches the absorbent article from the outside, and the user can be given the impression that the absorbent article is a soft product. On the other hand, the number of layers of nonwoven fabrics is small in the 2 nd region abutting on the leg of the wearer, and thus the uncomfortable feeling (stiff feeling) of the fitting is reduced.

The absorbent article is characterized in that the absorbent article has a plurality of high-density portions, the density of fibers constituting the nonwoven fabric is higher than that of the surroundings in the high-density portions, and the total area of the high-density portions located at the lateral portions of the 1 st region divided by the area of the lateral portions is larger than the total area of the high-density portions located at the central portions of the 1 st region in the width direction divided by the area of the central portions.

With such an absorbent article, the joining strength of the side portion of the 1 st region where the side portion of the nonwoven fabric having a narrow width is located is high, and the nonwoven fabric having a narrow width is not easily peeled off. On the other hand, in the central portion of the 1 st region, the area ratio of the high-density portion is low, so that the flexibility of the absorbent article can be maintained.

The absorbent article is characterized in that the absorbent article has the high-density portion extending across the lateral edge of the 1 st region in the width direction.

With such an absorbent article, a nonwoven fabric having a narrow width is less likely to be peeled off.

The absorbent article is characterized in that the number of the high-density portions is larger and the minimum interval between the high-density portions is smaller in the side portions of the 1 st region in the width direction than in the center portion of the 1 st region in the width direction.

With such an absorbent article, many high-density portions having a relatively small area are closely arranged on the side portion of the 1 st region where the side portion of the nonwoven fabric having a relatively narrow width is located. Therefore, the hardness of the side portion of the 1 st region is not easily perceived by the user.

The absorbent article is characterized in that the absorbent article has a plurality of high-density portions, the density of fibers constituting the nonwoven fabric is higher than that of the surroundings in the high-density portions, the total area of the high-density portions located at the longitudinal ends of the 1 st region divided by the area of the ends is larger than the total area of the high-density portions located at the longitudinal center of the 1 st region divided by the area of the center, the number of the high-density portions is larger at the longitudinal ends of the 1 st region than at the longitudinal center of the 1 st region, and the minimum interval between the high-density portions is smaller.

With such an absorbent article, the longitudinal end portions of the nonwoven fabric having a relatively narrow width are less likely to be peeled off. Further, since many high-density portions having a relatively small area are closely arranged at the end portion in the longitudinal direction of the 1 st region, the hardness of the end portion in the longitudinal direction of the 1 st region is not easily perceived by the user.

The absorbent article is characterized in that the plurality of nonwoven fabrics are joined to each other by the high-density portion and the adhesive at an end portion in at least one of the width direction and the length direction of the 1 st region.

With such an absorbent article, a nonwoven fabric having a relatively narrow width can be made more difficult to peel. In addition, the floating of the nonwoven fabric on the non-skin side can be suppressed.

The absorbent article is characterized in that the 1 st region is located at an end portion in at least one of the width direction and the length direction across the absorbent core.

With such an absorbent article, since the end portion of the absorbent core is covered with a large amount of nonwoven fabric in the 1 st region from the non-skin side, the hardness of the end portion of the absorbent core is not easily perceived by the user, and the user can be given the impression that the absorbent article is a soft product.

The absorbent article is characterized in that the absorbent article has leg elastic members that stretch in the longitudinal direction at the side portions in the width direction, and the 1 st region spans the end portions of the absorbent core in the width direction and is located inward of the leg elastic members in the width direction.

With such an absorbent article, the user is less likely to feel the hardness of the lateral ends of the absorbent core in the width direction, and the user can be given the impression that the absorbent article is a soft product. The stretchability of the leg hole elastic member can be suppressed from being reduced by the large number of nonwoven fabrics in the 1 st region.

The absorbent article is characterized in that the absorbent article has leg elastic members that stretch in the longitudinal direction on the side portions in the width direction, and the 1 st region spans the end portions of the absorbent core in the width direction and overlaps at least a part of the leg elastic members in the thickness direction.

With such an absorbent article, the user is less likely to feel the hardness of the lateral ends of the absorbent core in the width direction and the hardness of the leg elastic members, and can give the user the impression that the absorbent article is a soft product.

The absorbent article is characterized in that the absorbent article has a three-dimensional gather portion capable of standing toward the skin side on the side in the width direction, and the 1 st region is located in a range that is located outside the standing start point of the three-dimensional gather portion in the width direction.

With such an absorbent article, the excrement trapped in the three-dimensional gather portion is covered with many nonwoven fabrics in the 1 st region from the non-skin side, and therefore the shieldability of shielding the excrement from the outside of the absorbent article is improved.

The absorbent article is characterized in that the nonwoven fabric located closest to the non-skin side among the plurality of nonwoven fabrics has a lower friction coefficient than the nonwoven fabric located closer to the skin side than the nonwoven fabric.

With such an absorbent article, the softness of the non-skin side portion of the 1 st region is improved, and the feel of the non-skin side portion of the 1 st region is smoothed, so that the user can be further given the impression that the absorbent article is a soft product.

The absorbent article is characterized in that the plurality of nonwoven fabrics include a 1 st nonwoven fabric and a 2 nd nonwoven fabric having a length in the width direction longer than that of the 1 st nonwoven fabric, and the 1 st nonwoven fabric is disposed on the non-skin side than the 2 nd nonwoven fabric.

With such an absorbent article, the 1 st nonwoven fabric having a relatively narrow width can be prevented from being pressed from the non-skin side by the 2 nd nonwoven fabric having a relatively wide width, and thus the softness thereof can be prevented from being reduced.

The absorbent article is characterized in that the absorbent article is a belt-type diaper having a target belt and a pair of fastening tapes, the fastening tapes extend outward in the width direction from a back side region that is in contact with the back side of the wearer, the target belt is disposed in a abdomen side region that is in contact with the abdomen side of the wearer and the pair of fastening tapes are engaged with each other, and the target belt extends to a position that is further outward in the width direction than the 1 st nonwoven fabric.

With such an absorbent article, since the lateral end of the 1 st nonwoven fabric exposed to the outside is pressed by the target tape, peeling of the 1 st nonwoven fabric can be suppressed when the fastening tape is detached.

The absorbent article is characterized in that the plurality of nonwoven fabrics include a 1 st nonwoven fabric and a 2 nd nonwoven fabric having a length in the width direction longer than that of the 1 st nonwoven fabric, and the 1 st nonwoven fabric is disposed on the skin side than the 2 nd nonwoven fabric.

With such an absorbent article, the lateral ends of the 1 st nonwoven fabric having a relatively narrow width are not exposed to the outside of the absorbent article, and therefore, peeling of the 1 st nonwoven fabric can be suppressed.

The absorbent article has a crotch region that abuts against the crotch of a wearer, and the 1 st region is disposed at least in the crotch region in the longitudinal direction.

With such an absorbent article, the softness of the crotch portion of the absorbent article, which is easily grasped by the user, is high, and thus the user can be given the impression that the absorbent article is a soft product.

The absorbent article is characterized in that the 1 st region is disposed at least over the entire region of the absorbent core in the longitudinal direction.

With such an absorbent article, since the entire area in the longitudinal direction of the absorbent core is covered with a large amount of nonwoven fabric in the 1 st area, the hardness of the absorbent core is not easily perceived by the user, and the user can be given the impression that the absorbent article is a soft product.

The absorbent article is characterized in that the absorbent article is a pants-type diaper in which a back side region abutting against a back side portion of a wearer and both side portions in the width direction of a abdomen side region abutting against a abdomen side portion of the wearer are joined by a pair of joint portions, the back side region and the abdomen side region each have a plurality of waist elastic members that stretch in the width direction, and the 1 st region is located in a region that does not overlap with the stretch portion of the waist elastic member in the thickness direction.

With such an absorbent article, the stretchability of the waist elastic member is suppressed from being reduced by the plurality of nonwoven fabrics in the 1 st region, and the fitting property of the absorbent article to the waist of the wearer can be maintained.

Hereinafter, as an example of the absorbent article of the present embodiment, a belt-type disposable diaper for children (embodiment 1) and a pants-type disposable diaper (embodiment 2) are illustrated. However, the absorbent article is not limited to the above-described embodiment, and examples of other absorbent articles include disposable diapers for adults, urine absorbing pads, sanitary napkins, and the like.

= = 1 st embodiment= = = =1 st embodiment

Basic structure of disposable belt diaper 1

Fig. 1 is a plan view of a tape type disposable diaper 1 (hereinafter also referred to as "diaper") in an extended and stretched state when viewed from the skin side. Fig. 2 is a plan view of the diaper 1 in an extended and stretched state, as viewed from the non-skin side. Fig. 3 is a schematic cross-sectional view at line AA in fig. 1. The extended state of the diaper 1 is a state in which the entire diaper 1 is extended to be wrinkle-free, specifically, a state in which the dimensions of the respective members constituting the diaper 1 are made to be identical or close to the dimensions of the individual members.

The diaper 1 has a longitudinal direction, a width direction, and a thickness direction in the developed state shown in fig. 1. The diaper 1 has a back side region 1A which is arranged in the longitudinal direction and abuts against the back side of the wearer, a crotch region 1B which abuts against the crotch of the wearer, and a stomach side region 1C which abuts against the stomach side of the wearer. The side in the thickness direction that contacts the skin of the wearer is referred to as the skin side or the skin surface side, and the opposite side is referred to as the non-skin side or the non-skin surface side.

As shown in fig. 3, the diaper 1 includes an absorbent core 10, a liquid-permeable top sheet 2 (liquid-permeable sheet) disposed on the skin side of the absorbent core 10, a liquid-impermeable leakage-proof sheet 3 (liquid-impermeable sheet) disposed on the non-skin side of the absorbent core 10, a plurality of (two in the present embodiment) nonwoven fabrics 4 and 5 disposed on the non-skin side of the leakage-proof sheet 3, and a pair of side sheets 6 extending outward in the width direction from both lateral sides in the width direction on the skin surface of the top sheet 2. Materials adjacent in the thickness direction are bonded to each other with an adhesive (e.g., hot melt adhesive HMA). The leak-proof sheet 3 may be a synthetic resin film, a composite sheet of a synthetic resin film and a nonwoven fabric, or the like.

As the absorbent core 10, an absorbent core obtained by molding a material containing a superabsorbent polymer in a liquid-absorbent fiber such as pulp fiber into a predetermined shape can be exemplified. The absorbent core 10 may be covered with a liquid-permeable core wrap sheet 11 such as tissue paper or nonwoven fabric. Further, as the absorbent core 10, an SAP sheet having an SAP layer attached to a hydrophilic sheet, an airlaid sheet obtained by shaping a liquid-absorbent fiber into a sheet by an airlaid method, or the like can be exemplified.

The diaper 1 has a pair of three-dimensional gather portions 20 that can stand up toward the skin side at both side portions in the width direction. In the three-dimensional gather portion 20, an elastic member 21 (for example, an elastic thread) that stretches in the longitudinal direction is provided at the end portion on the inner side in the width direction of the side sheet 6. Thus, a part of the side sheet 6 is lifted up, and excrement can be blocked.

The diaper 1 further includes leg elastic members 7 extending and contracting in the longitudinal direction at positions outside the three-dimensional gather portion 20 in the width direction. In the present embodiment, 3 elastic threads are respectively arranged on both sides of the diaper 1 in the width direction as the leg elastic members 7. However, the leg elastic member 7 is not limited to an elastic thread, and may be a sheet elastic member such as an elastic film. The diaper 1 is fitted to the leg cuffs of the wearer by the leg cuff elastic members 7.

The diaper 1 has a waist elastic member 8 that stretches and contracts in the width direction in the back side region 1A, which is the end portion on the back side in the longitudinal direction. The waist elastic member 8 of the present embodiment is a sheet-like elastic member such as a stretchable film, which is not shown, but is disposed between the front sheet 2 and the leakage preventing sheet 3 in the thickness direction. The diaper 1 is fitted to the waist of the wearer by the waist elastic member 8.

The diaper 1 further includes a pair of fastening tapes 30 extending from the back side region 1A to both outer sides in the width direction. The hook and loop fastener 30 has a base material 31 and a hook piece 32 (e.g., a male member of a nylon hook and loop fastener). The diaper 1 further has a target belt 9 disposed on the non-skin surface of the abdomen-side area 1C. The target tape 9 is a rectangular member having a long width that can be engaged with the hook and loop fastener 30, and is formed of, for example, a nonwoven fabric or a concave member of a nylon hook and loop fastener.

The structure of the diaper 1 is an example, and is not limited thereto. For example, the diaper 1 may not have the three-dimensional gather portion 20 or the target tape 9.

A plurality of non-woven fabrics 4, 5 arranged on the non-skin side

Fig. 4 is an explanatory diagram of the 1 st region R1 and the 2 nd region R2. Fig. 5, 6A and 6B are explanatory views of the high-density portion 40. Fig. 7A and 7B are schematic cross-sectional views of a diaper 1 according to a modification.

As shown in fig. 3, the diaper 1 has a plurality of nonwoven fabrics 4, 5 arranged on the non-skin side of the liquid-impermeable leakage preventing sheet 3. The diaper 1 of the present embodiment has, as the plurality of nonwoven fabrics 4, 5, a 1 st nonwoven fabric 4 and a 2 nd nonwoven fabric 5 having different lengths in the width direction (for example, maximum widths of the nonwoven fabrics). The 1 st nonwoven fabric 4 is disposed on the non-skin side in the thickness direction of the 2 nd nonwoven fabric 5. As shown in fig. 4, the 1 st nonwoven fabric 4 is formed in a rectangular shape long in the longitudinal direction of the diaper 1, and has a length from one end to the other end in the longitudinal direction of the diaper 1. The 2 nd nonwoven fabric 5 is formed into the outer shape of the diaper 1, and its length in the width direction is longer than the length in the width direction of the 1 st nonwoven fabric 4.

The 1 st nonwoven fabric 4 is disposed in the widthwise central portion of the 2 nd nonwoven fabric 5 forming the outer shape of the diaper 1. Therefore, the 1 st nonwoven fabric 4 and the 2 nd nonwoven fabric 5 overlap the absorbent core 10 when the diaper 1 is viewed in plan in the thickness direction.

The diaper 1 has a 1 st region R1 and a 2 nd region, wherein the 1 st region R1 overlaps at least part of the absorbent core 10 in the thickness direction, and the 2 nd region is located outside the 1 st region R1 in the width direction and does not overlap the absorbent core 10 in the thickness direction. In the present embodiment, the region where the 2 nd nonwoven fabric 5 and the 1 st nonwoven fabric 4 overlap in the thickness direction is referred to as a 1 st region R1, and the region where the 2 nd nonwoven fabric 5 and the 1 st nonwoven fabric 4 do not overlap in the thickness direction is referred to as a 2 nd region R2. Therefore, the number of nonwoven fabrics on the non-skin side of the leakage preventing sheet 3 is larger in the 1 st region R1 than in the 2 nd region R2.

When the user touches the portion of the diaper 1 where the absorbent core 10 having high rigidity is located from the outside (non-skin side), the user easily feels the rigidity of the diaper 1. Therefore, as described above, in the 1 st region R1 overlapping the absorbent core 10, it is preferable to laminate more nonwoven fabrics on the non-skin side than the leakage preventing sheet 3. By doing so, the softness (cushioning property) can be improved by using the bulky nonwoven fabric in which the two nonwoven fabrics 4, 5 are overlapped on the non-skin side portion of the 1 st region R1. Therefore, the user touching the 1 st region R1 from the outside is less likely to feel the hardness of the absorbent core 10 and is likely to feel the softness of the diaper 1. As a result, the user can be given the impression that the diaper 1 is a soft, comfortable-to-wear product.

On the other hand, the 2 nd region R2 located on the outer side in the width direction than the 1 st region R1 is abutted against the leg circumference of the wearer. Therefore, in the 2 nd region R2, the number of nonwoven fabrics arranged on the non-skin side of the leakage preventing sheet 3 is preferably small. By doing so, the thickness of the 2 nd region R2 can be suppressed. As a result, the wearer does not easily feel the stiffness of the diaper 1 when folding the legs or moving the legs back and forth, and the uncomfortable feeling of fitting is reduced.

In the present embodiment, the 1 st nonwoven fabric 4 and the 2 nd nonwoven fabric 5 are hot air nonwoven fabrics. However, the present invention is not limited thereto, and other nonwoven fabrics (for example, spunbond nonwoven fabrics, spunbond, meltblown, spunbond nonwoven fabrics, and the like) may be used, and in this case, the softness of the non-skin side portion of the 1 st region R1 can be improved. In the present embodiment, the number of nonwoven fabrics arranged on the non-skin side of the leakage preventing sheet 3 is two, but three or more nonwoven fabrics may be used. The 1 st nonwoven fabric 4 and the 2 nd nonwoven fabric 5 may be different types of nonwoven fabrics.

As shown in fig. 5, the diaper 1 has a plurality of high-density portions 40, and the density of the fibers constituting the 1 st nonwoven fabric 4 and the 2 nd nonwoven fabric 5 in the high-density portions 40 is higher than that in the surroundings. The high-density portion 40 may be formed by, for example, compressing the nonwoven fabrics 4, 5 without heating, or may be formed by a welding process such as ultrasonic welding or thermal welding. The comparison of the density of the high-density portion 40 and the surrounding fiber density can be performed by a well-known method. For example, the comparison can be made based on an image obtained by enlarging a cross section obtained by cutting a portion of the diaper 1 including the high-density portion 40 in the thickness direction by an electron microscope or the like.

The high-density portion 40 located in the 1 st region R1 where the 1 st nonwoven fabric 4 and the 2 nd nonwoven fabric 5 overlap each other functions as a joint portion for joining the 1 st nonwoven fabric 4 and the 2 nd nonwoven fabric 5 together. The high-density portion 40 prevents the 1 st nonwoven fabric 4 disposed on the non-skin side from peeling off and lifting.

In the diaper 1 of the present embodiment, as shown in fig. 5, the area ratio of the high-density portion 40 of the side portion R11 in the width direction of the 1 st region R1 is higher than the central portion R12 in the width direction of the 1 st region R1. Specifically, the value (A1/A2) obtained by dividing the total area (A1) of the high-density portions 40 located at the side portions R11 of the 1 st region R1 by the area (A2) of the side portions R11 is larger than the value (A3/A4) obtained by dividing the total area (A3) of the high-density portions 40 located at the widthwise central portion R12 of the 1 st region R1 by the area (A4) of the central portion R12.

The side portion R11 of the 1 st region R1 corresponds to the side portion of the 1 st nonwoven fabric 4 having a relatively narrow width in the width direction. Therefore, the side portions of the 1 st nonwoven fabric 4 are less likely to be peeled off by increasing the area ratio of the high-density portions 40 in the side portions R11 of the 1 st region R1. In particular, when the 1 st nonwoven fabric 4 is disposed on the non-skin side of the 2 nd nonwoven fabric 5, the side edges 4a in the width direction of the 1 st nonwoven fabric 4 are exposed and easily peeled off, so that the high-density portion 40 is preferably disposed as described above. However, the high-density portion 40 is harder than the surroundings. Therefore, it is preferable to make the area ratio of the high-density portion 40 lower in the central portion R12 of the 1 st region R1. By doing so, the decrease in flexibility of the 1 st region R1 caused by the overlapping of the two nonwoven fabrics 4, 5 can be suppressed, and the user can be given the impression that the diaper 1 is a soft product.

The side portion R11 of the 1 st region R1 is a region having a predetermined width from the side edge R1a of the 1 st region R1 (1 st nonwoven fabric 4) to the inside in the width direction. The center portion R12 of the 1 st region R1 is a region having the predetermined width on the inner side in the width direction than the side portion R11. The predetermined width is set to be 1/3 or less of the width of the 1 st region R1.

The comparison of the area ratios of the high-density portions 40 may be performed by visual observation, or may be performed by calculating the areas of the respective portions of the image data obtained by capturing the target portion of the 1 st region R1 using area measurement software.

It is also preferable to make the area ratio of the high-density portion 40 as small as possible (the extent to which the 1 st nonwoven fabric 4 does not separate) smaller. In the present embodiment, the width W1 (see fig. 5) of the region where the area ratio of the high-density portion 40 is high is set to about 1/13 to 1/14 of the width of the 1 st region R1, and the area ratio of the high-density portion 40 is low in the region located inside the region. By doing so, flexibility can be maintained in a larger range in the width direction of the 1 st region R1.

It is also preferable that the number of the high-density portions 40 is large and the minimum interval between the high-density portions 40 is small in the side portions R11 in the width direction of the 1 st region R1, compared with the center portion R12 in the width direction of the 1 st region R1. That is, as shown in fig. 5, it is preferable that a plurality of high-density portions 40 having a relatively small area are closely arranged in the side portion R11 of the 1 st region R1. By doing so, even in the same area ratio, the hardness of the side portion R11 is not easily perceived by the user both visually and tactilely, as compared with the case where the high-density portions 40 having a large area are arranged dispersedly. Further, the 1 st nonwoven fabric 4 is not easily peeled in a wide range.

On the other hand, it is preferable that a small number of high-density portions 40 are arranged sparsely in the widthwise central portion R12 of the 1 st region R1 (preferably in the region on the inner side in the widthwise direction than the side portions R11). By doing so, the flexibility of the 1 st region R1 can be maintained.

In the pattern of the high-density portions 40 illustrated in fig. 5, the high-density portions 40 (the cross-shaped or flower-shaped high-density portions 40) are alternately arranged at positions on the inner side in the width direction than the side portions R11 of the 1 st region R1. Therefore, the non-skin surface of the 1 st region R1 becomes uneven like a quilted cloth, and the user can be visually given the impression that the diaper 1 is a soft product.

The high-density portion 40 is also provided at the end of the 2 nd region R2 in the width direction adjacent to the 1 st region R1. In this case, as shown in fig. 6A, the diaper 1 preferably has a high-density portion 401 extending across the 1 st region R1 (1 st nonwoven fabric 4) in the width direction and having a side edge R1a in the width direction. By doing so, the side edges 4a in the width direction of the 1 st nonwoven fabric 4 having a relatively narrow width can be fixed to the 2 nd nonwoven fabric 5 by the high-density portion 401, and hence peeling of the 1 st nonwoven fabric 4 can be further prevented.

It is preferable that the high-density portion 40 is arranged not only in the width direction but also in the longitudinal direction. That is, as shown in fig. 5, it is preferable that the total area of the high-density portions 40 located at the longitudinal ends R13 of the 1 st region R1 divided by the area of the ends R13 is larger than the total area of the high-density portions 40 located at the longitudinal center portions R14 of the 1 st region R1 divided by the area of the center portions R14. Further, it is preferable that the number of the high-density portions 40 is larger and the minimum interval between the high-density portions 40 is smaller at the end portions R13 in the longitudinal direction of the 1 st region R1 than at the central portion R14 in the longitudinal direction of the 1 st region R1.

By doing so, the end portion R13 of the 1 st nonwoven fabric 4 in the longitudinal direction can be made less likely to peel off, and the flexibility of the 1 st region R1 can be maintained. In addition, since a large number of high-density portions 40 having a relatively small area are closely arranged in the longitudinal end portion R13 of the 1 st region 4, the hardness of the end portion R13 is not easily perceived by the user both visually and tactilely. Further, the 1 st nonwoven fabric 4 is not easily peeled in a wide range.

The end portion R13 in the longitudinal direction of the 1 st region R1 is a region having a predetermined width from the end portion R1b in the longitudinal direction of the 1 st region R1 (1 st nonwoven fabric 4) to the central side in the longitudinal direction. The central portion R14 in the longitudinal direction of the 1 st region R1 is a region having the predetermined width on the central side in the longitudinal direction of the end portion R13. The predetermined width is set to a length of 1/3 or less of the length of the 1 st region R1.

In addition, a circular or flower-shaped high-density portion 40 is provided at the side portion R11 in the width direction of the 1 st region R1, whereas a rectangular high-density portion 402 is provided at the end portion R13 in the length direction of the 1 st region R1. Further, the diaper 1 of the present embodiment has a waist elastic member 8 that stretches in the width direction in the back side region 1A. In this case, as shown in fig. 5 and 6B, in the region where the waist elastic member 8 is disposed, the high-density portions 402 having a shape longer in the longitudinal direction than in the width direction are preferably arranged at intervals in the width direction. Specifically, it is preferable that the rows of the high-density portions 402 are arranged with a space therebetween in the width direction, and the high-density portions 402 are arranged with a space therebetween in the longitudinal direction. By so doing, when the waist elastic member 8 is contracted, the sheet portions between the rows of the high-density portions 402 extending in the longitudinal direction are easily deformed into convex shapes, forming beautiful longitudinal gathers, enhancing the appearance of the diaper 1. Further, the longitudinal rigidity of the longitudinal end portions of the diaper 1 can be improved by the aesthetically formed longitudinal folds, and bending and twisting of the end portions can be suppressed.

Further, it is preferable that the rectangular high-density portions 402 are arranged at intervals in the width direction in the region from the lower end 8a (the end 8a on the longitudinal center side) of the waist elastic member 8 to the longitudinal end of the absorbent core 10. By doing so, the longitudinal wrinkles formed by the rectangular high-density portions 402 reach the longitudinal ends of the absorbent core 10. That is, the longitudinal rigidity of the region between the waist elastic member 8 and the absorbent core 10 is also improved, so that the diaper 1 is less likely to bend starting from the waist elastic member 8 and the end portions 8a, 10a of the absorbent core 10, improving the appearance of the diaper 1.

On the other hand, in the region on the abdomen side in the longitudinal direction where the waist elastic member 8 is not disposed, it is preferable to make the region where the high-density portion 402 is disposed as close as possible smaller. By doing so, flexibility can be maintained in a wide range on the abdomen side in the longitudinal direction of the 1 st region R1.

As shown in fig. 3, the 1 st nonwoven fabric 4 and the 2 nd nonwoven fabric 5 may be joined together with the high-density portion 40 by an adhesive (for example, a hot melt adhesive HMA). In the present embodiment, the adhesive HMA is applied to the entire area of the plane of the 1 st nonwoven fabric 4. The adhesive HMA may be applied in a whole surface (so-called whole surface application) or in various known application patterns such as a stripe pattern and a dot pattern.

By joining the 1 st nonwoven fabric 4 and the 2 nd nonwoven fabric 5 by the adhesive HMA, the 1 st nonwoven fabric 4 can be prevented from floating from the 2 nd nonwoven fabric 5, and the appearance of the diaper 1 can be improved. Further, the visual recognition of the indication portion (not shown) for informing of excretion is improved by design printing (not shown) applied to the material (for example, the leakage preventing sheet 3) on the skin side of the 1 st nonwoven fabric 4.

However, the application range of the adhesive HMA to the 1 st nonwoven fabric 4 is not limited to the whole area, and may be partial. In particular, it is preferable that the 1 st nonwoven fabric 4 and the 2 nd nonwoven fabric 5 are bonded to each other by the high-density portion 40 and the adhesive HMA at the end portion in at least one of the width direction and the length direction of the 1 st region R1. By doing so, the joining strength of the end portion of the 1 st nonwoven fabric 4 increases, and peeling of the 1 st nonwoven fabric 4 can be further suppressed.

In the region where the elastic member of the diaper 1 such as the waist elastic member 8 is disposed, the 1 st nonwoven fabric 4 and the 2 nd nonwoven fabric 5 are preferably joined by the high-density portion 40 and the adhesive HMA. By doing so, the 1 st nonwoven fabric 4 and the 2 nd nonwoven fabric 5 are integrally shrunk, and beautiful gathers are formed. In addition, it is preferable that the 1 st nonwoven fabric 4 and the 2 nd nonwoven fabric 5 are bonded by the high-density portion 40 and the adhesive HMA also in the region where the design print and the instruction portion are arranged.

However, since the rigidity of the region where the adhesive HMA is provided increases, it is preferable that the adhesive HMA between the 1 st nonwoven fabric 4 and the 2 nd nonwoven fabric 5 is applied thinly. For example, the adhesive HMA between the 1 st nonwoven fabric 4 and the 2 nd nonwoven fabric 5 is preferably smaller in weight per unit area (mass per unit area) than the adhesive HMA for joining other materials of the diaper 1. By doing so, the flexibility of the 1 st region R1 can be maintained.

The method of joining the 1 st nonwoven fabric 4 and the 2 nd nonwoven fabric 5 has been described above, but the arrangement, shape, etc. of the high-density portion 40 are not limited to the above-described method (pattern shown in fig. 5). Further, the diaper 1 may not have the high-density portion 40, and for example, the 1 st nonwoven fabric 4 and the 2 nd nonwoven fabric 5 may be joined by only the adhesive HMA. In this case, for example, the weight per unit area of the adhesive HMA at the end portion of the 1 st region R1 in at least one of the width direction and the length direction may be made higher than that of the other regions. By doing so, the 1 st nonwoven fabric 4 can be prevented from peeling off, and the flexibility of the 1 st region R1 can be maintained.

As shown in fig. 4, the 1 st region R1 (1 st nonwoven fabric 4) is preferably located at the end portions 10a, 10b in at least one of the width direction and the longitudinal direction of the absorbent core 10. The 1 st region R1 of the present embodiment is located at the positions of the end portions 10a, 10b in both the width direction and the longitudinal direction across the absorbent core 10. By doing so, the end portions 10a, 10b of the absorbent core 10 are covered with the two nonwoven fabrics 4, 5 (bulky nonwoven fabrics having cushioning properties) from the non-skin side, and therefore the user touching the diaper 1 from the outside is less likely to feel steps (portions with hard edges) at the end portions 10a, 10b of the absorbent core 10. Thus, the user can be given the impression that the diaper 1 is a soft product.

In the diaper 1 of the present embodiment, the 1 st region R1 (1 st nonwoven fabric 4) is located outside the side end 10a of the absorbent core 10 in the width direction, but is located inside the leg elastic member 7 in the width direction. In this case, since the leg hole elastic members 7 do not overlap the two nonwoven fabrics 4, 5 in the thickness direction, the reduction in stretchability of the leg hole elastic members 7 can be suppressed. Thus, the diaper 1 can be firmly fitted to the leg circumference of the wearer.

However, in contrast to the above, as shown in fig. 7A, the 1 st nonwoven fabric 4 may be longer in the width direction, so that the 1 st region R1 (1 st nonwoven fabric 4) and at least part of the leg elastic member 7 overlap in the thickness direction. In this case, since the leg hole elastic member 7 is covered with the two nonwoven fabrics 4 and 5 (bulky nonwoven fabrics having cushioning properties) from the non-skin side, the user who touches the diaper 1 from the outside does not easily feel the hardness of the leg hole elastic member 7. Thus, the user can be given the impression that the diaper 1 is a soft product.

The diaper 1 of the present embodiment has a three-dimensional gather portion 20. As shown in fig. 4, the three-dimensional gather portion 20 includes a 1 st fixing portion 22 and a 2 nd fixing portion 23 for fixing the side sheet 6 to the skin surface of the front sheet 2 with an adhesive or the like. The 1 st fixing portion 22 is continuously provided in a range from one end to the other end in the longitudinal direction of the side sheet 6. The 2 nd fixing portion 23 is provided on the inner side in the width direction than the 1 st fixing portion 22 and is a position of both end portions in the longitudinal direction of the diaper 1. Further, a plurality (here, 3) of 2 nd fixing portions 23 having a short length are provided at each end portion in the longitudinal direction of the diaper 1 at intervals in the width direction. The side sheet 6 is located at a position on the inner side in the width direction than the 1 st fixing portion 22 and at a position on the inner side in the longitudinal direction than the 2 nd fixing portion 23, and serves as a standing portion of the three-dimensional gather portion 20.

Further, it is preferable that the 1 st region R1 (1 st nonwoven fabric 4) is located in a range outside the erection starting point 20a (the inner end in the width direction of the 1 st fixing portion 22) in the width direction of the three-dimensional gather portion 20. By doing so, the excrement trapped by the three-dimensional gather portion 20 is covered with the two nonwoven fabrics 4, 5 from the non-skin side, so that the shielding property of the excrement from the outside of the diaper 1 is improved, and the exudation of the excrement can be suppressed. In particular, in the diaper 1 of the present embodiment, the erection starting point 20a in the width direction of the three-dimensional gather portion 20 is located at the outer side in the width direction than the side end 10a in the width direction of the absorbent core 10. Therefore, the barrier property against the excrement flowing to the outer side in the width direction of the absorbent core 10 can be improved or the exudation can be suppressed.

However, the arrangement position in the width direction of the 1 st region R1 is not limited to the above-described mode. The 1 st region R1 may overlap at least a part of the absorbent core 10 in the width direction in the thickness direction.

In the diaper 1 of the present embodiment, the 1 st nonwoven fabric 4 has a length from one end to the other end in the longitudinal direction of the diaper 1. However, the length of the 1 st nonwoven fabric 4 may be shorter than the length of the diaper 1 (i.e., the length of the 2 nd nonwoven fabric 5 forming the outer shape). In this case, the 1 st region R1 (1 st nonwoven fabric 4) is preferably disposed at least in the crotch region 1B of the diaper 1 in the longitudinal direction. Generally, the belt diaper 1 is circulated in a state of being folded in half in the longitudinal direction. Therefore, the crotch region 1B of the diaper 1 is easily gripped by the user when the diaper 1 is taken out of the package or the like. Therefore, the softness (cushioning property) of the crotch region 1B of the diaper 1 is improved by the two nonwoven fabrics 4, 5, whereby the softness of the diaper 1 can be perceived by the user.

More preferably, the 1 st region R1 (1 st nonwoven fabric 4) is disposed at least over the entire region of the absorbent core 10 in the longitudinal direction. By doing so, the entire area of the absorbent core 10 having high rigidity is covered with two nonwoven fabrics 4, 5 (bulky nonwoven fabrics having cushioning properties) from the non-skin side, and the user does not easily feel the rigidity of the absorbent core 10. As described above, the 1 st region R1 (1 st nonwoven fabric 4) is preferably located at a position crossing the longitudinal end 10b of the absorbent core 10.

However, the arrangement position of the 1 st region R1 in the longitudinal direction is not limited to the above-described mode. The 1 st region R1 may overlap at least a part of the longitudinal direction of the absorbent core 10 in the thickness direction. The crotch region 1B of the diaper 1 is a region of a predetermined width including a longitudinal center line Cl of the diaper 1 in a state of being developed in the longitudinal direction. For example, the absorbent core 10 of the present embodiment is formed in an hourglass shape in which the central portion in the longitudinal direction is narrowed inward in the width direction. Therefore, the region where the absorbent core 10 is narrowed (the region slightly toward the abdomen including the center line Cl in the longitudinal direction) is defined as the crotch region 1B. For example, the center region of the diaper 1 divided into three in the longitudinal direction may be the crotch region 1B.

In the diaper 1 of the present embodiment, as shown in fig. 3, the 1 st nonwoven fabric 4 having a short length in the width direction is disposed on the non-skin side (outer side) than the 2 nd nonwoven fabric 5. Therefore, the 1 st nonwoven fabric 4 is pressed from the non-skin side by the 2 nd nonwoven fabric 5 longer in the width direction, and the bulk (softness, cushioning) of the 1 st nonwoven fabric 4 can be suppressed from decreasing. Thus, the flexibility of the 1 st region R1 achieved by overlapping the two nonwoven fabrics 4, 5 can be obtained efficiently.

However, as opposed to the above, as shown in fig. 7B, the 1 st nonwoven fabric 4 having a short length in the width direction may be disposed closer to the skin side (inside) than the 2 nd nonwoven fabric 5. In this case, the 1 st nonwoven fabric 4 is not easily peeled off since the lateral ends of the 1 st nonwoven fabric 4 in the width direction are not exposed to the outside. Further, since the non-skin surface of the diaper 1 is smooth, the user can visually be given the impression that the diaper 1 is a soft product.

In the case where the 1 st nonwoven fabric 4 is positioned on the non-skin side and the lateral end 4a of the 1 st nonwoven fabric 4 in the width direction is exposed to the outside like the diaper 1 of the present embodiment, it is preferable that the target tape 9 is protruded to the outside in the width direction than the 1 st nonwoven fabric 4 as shown in fig. 2. By doing so, the lateral end 4a of the 1 st nonwoven fabric 4 in the width direction is pressed from the non-skin side by the target tape 9. Therefore, even when the fastening tape 30 engaged with the target tape 9 is detached, the 1 st nonwoven fabric 4 is not easily peeled off. However, the present invention is not limited to the above-described embodiment, and the target tape 9 may not extend beyond the 1 st nonwoven fabric 4 in the width direction.

It is also preferable that the nonwoven fabric (nonwoven fabric 1, nonwoven fabric 4 according to the present embodiment) located closest to the non-skin side among the plurality of nonwoven fabrics disposed closest to the non-skin side of the leakage preventing sheet 3 has a lower friction coefficient than the nonwoven fabric (nonwoven fabric 2, nonwoven fabric 5 according to the present embodiment) located closest to the skin side of the nonwoven fabric (nonwoven fabric 1, nonwoven fabric 4). For example, in the case where the nonwoven fabric is a hot air nonwoven fabric, the average fiber diameter of the 1 st nonwoven fabric 4 of the outermost layer is preferably smaller than the average fiber diameter of the 2 nd nonwoven fabric 5. However, the fiber diameter of the 1 st nonwoven fabric 4 is not limited to be smaller than the fiber diameter of the 2 nd nonwoven fabric 5. For example, the 1 st nonwoven fabric 4 may be composed of a plurality of layers having different fiber diameters, the fiber diameter of the non-skin side layer of the 1 st nonwoven fabric 4 may be smaller than the fiber diameter of the skin side layer of the 1 st nonwoven fabric 4, and the fiber diameter of the non-skin side layer of the 1 st nonwoven fabric 4 may be smaller than the fiber diameter of the 2 nd nonwoven fabric 5. With such 1 st nonwoven fabric 4, the non-skin surface of the 1 st nonwoven fabric 4 in contact with the user can be smoothed, and the bulkiness (cushioning properties) of the 1 st nonwoven fabric 4 can be maintained. In this case, the fiber diameter of the skin-side layer of the 1 st nonwoven fabric 4 may be not less than the fiber diameter of the 2 nd nonwoven fabric 5, or not more than the fiber diameter. In the case where the nonwoven fabric is a spunbond nonwoven fabric, for example, it is preferable to apply a lubricant to the fibers of the 1 st nonwoven fabric 4 constituting the outermost layer.

By doing so, the non-skin surface of the diaper 1 (region 1R 1) becomes smooth in hand. Therefore, the user who touches the diaper 1 from the outside can feel the softness and smoothness of the diaper 1, and the user can be given the impression that the diaper 1 is a soft, comfortable-to-wear product.

In addition, the friction coefficient can be compared by a well-known method. For example, it is preferable to compare the characteristic values of KES manufactured by add-on technology, which are generally known as characteristic values indicating the touch feeling of the surface of the sheet. Specifically, the 1 st nonwoven fabric 4 and the 2 nd nonwoven fabric 5 were separated from the diaper 1, and samples (for example, 1.0X1.0 cm) of a predetermined size were cut out from the respective nonwoven fabrics 4, 5, placed on a flat metal plane test stand, and measured by KES-FB4 manufactured by Kagaku Kogyo Co., ltd. Specifically, a force of 50gf was applied to the contact in which 10 piano wires having a diameter of 0.5mm were arranged by means of weights, so that the contact surface of the contact was pressed against the sample. The sample was horizontally moved at a speed of 0.1cm/sec for 2cm, and a uniaxial tension of 20gf/cm was applied to the sample. The characteristic values in two orthogonal directions are measured for each sample, and the average value thereof can be compared as the friction coefficient of each sample.

The thickness of the 1 st nonwoven fabric 4 and the thickness of the 2 nd nonwoven fabric 5 may be the same or different. For example, when the thickness of the nonwoven fabric (nonwoven fabric 1, nonwoven fabric 4 according to the present embodiment) serving as the outermost layer is made relatively thick, the softness (cushioning property) of the nonwoven fabric directly touched by the user increases. Therefore, the user can further feel the softness of the diaper 1. In contrast, when the thickness of the nonwoven fabric on the skin side, which is the nonwoven fabric forming the outer shape of the diaper 1 like the nonwoven fabric 2 of the present embodiment, is large, the softness of the region 2R 2 in which the number of layers of the nonwoven fabric is small is also increased. Therefore, the user can feel the softness of the diaper 1 regardless of the position where the user touches the diaper 1.

The thickness of the 1 st nonwoven fabric 4 and the thickness of the 2 nd nonwoven fabric 5 can be compared by a known method. For example, the 1 st nonwoven fabric 4 and the 2 nd nonwoven fabric 5 are separated from the diaper 1. Further, using a pointer type thickness gauge ID-C1012C manufactured by Sanfeng (Co., ltd.) or an equivalent thereof, it is possible to obtain a measurement value of, for example, 3.0gf/cm ² The measured values of the respective nonwoven fabrics 4, 5 were pressurized and compared.

= = 2 nd embodiment= = = =

Fig. 8A is a schematic perspective view of the pants-type diaper 50, and fig. 8B is a plan view of the pants-type diaper 50 in an extended and stretched state, as viewed from the non-skin side. The absorbent article may be a pants-type diaper 50 in which a pair of joining portions 51 join both side portions in the width direction of a back side region 50A that abuts against the back side portion of the wearer and a stomach side region 50B that abuts against the stomach side portion of the wearer. As shown in fig. 8B, the pants-type diaper 50 has a longitudinal direction, a width direction, and a thickness direction in a state in which the back side region 50A is separated from the abdomen side region 50B by releasing the engagement of the pair of engagement portions 51.

The pants-type diaper 50 illustrated in embodiment 2 includes an absorbent main body 52 and an outer member 53 disposed on the non-skin side of the absorbent main body 52. Although not shown, the absorbent main body 52 includes at least a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent core 521 disposed between the top sheet and the back sheet. The outer cover member 53 includes a 1 st nonwoven fabric 531 disposed on the non-skin side, two 2 nd nonwoven fabrics 532 forming the outer shape of the pants-type diaper 50, and a plurality of waist elastic members 533 disposed between the two 2 nd nonwoven fabrics 532 and extending and contracting in the width direction.

In the pants-type diaper 50 according to embodiment 2, a plurality of nonwoven fabrics (1 st nonwoven fabric 531 and two 2 nd nonwoven fabrics 532) are arranged on the non-skin side of the leakage preventing sheet of the absorbent main body 50. The 1 st nonwoven fabric 531 has a smaller width than the 2 nd nonwoven fabric 532, and the 1 st nonwoven fabric 531 is disposed at a position overlapping the absorbent core 521 in the thickness direction. Therefore, in the 1 st region R1 of the pants-type diaper 50 overlapping the absorbent core 521 in the thickness direction, three nonwoven fabrics 531, 532 are laminated. In the 2 nd region R2, which is located on the outer side in the width direction than the 1 st region R1 and does not overlap the absorbent core 10 in the thickness direction, two nonwoven fabrics 532 are laminated. Therefore, the user who touches the 1 st region R1 from the outside is less likely to feel the hardness of the absorbent core 521, and can feel the softness (cushioning properties) of the diaper 1. On the other hand, in the 2 nd region R2 which is in contact with the leg circumference of the wearer, the number of laminated nonwoven fabrics is small, and thus the uncomfortable feeling of mounting is reduced.

The waist elastic members 533 are disposed in plural at intervals in the longitudinal direction in the back side region 50A and the abdomen side region 50B of the pants-type diaper 50. The waist elastic member 533 is preferably not stretchable in a region overlapping the absorbent core 521 in the thickness direction (for example, the waist elastic member 533 is not provided or the waist elastic member 533 is preferably cut). By doing so, deformation of the absorbent core 521 due to the waist elastic member 533 can be prevented, and adhesiveness between the wearer and the absorbent core 521 is improved. Fig. 8B shows only the stretchable portion showing stretchability of the waist elastic member 533.

In the above case, it is preferable that the 1 st region R1 (1 st nonwoven fabric 531) is located in a region that does not overlap with the stretch portion of the waist elastic member 533 in the thickness direction. By doing so, the expansion and contraction force of the waist elastic member 533 can be prevented from weakening by the 1 st region R1 in which many nonwoven fabrics 531, 532 are laminated. Thus, the pants-type diaper 50 can be firmly attached to the waist of the wearer.

The embodiments of the present invention have been described above for the purpose of facilitating understanding of the present invention, and are not intended to limit the present invention. It is to be understood that the present invention can be modified and improved without departing from the spirit thereof, and equivalents thereof are included in the present invention.

Claims

1. An absorbent article comprising a longitudinal direction, a width direction and a thickness direction,

and an absorbent core, a liquid-permeable sheet disposed on the skin side of the absorbent core, and a liquid-impermeable sheet disposed on the non-skin side of the absorbent core, characterized in that,

the absorbent article has a plurality of nonwoven fabrics arranged on the non-skin side of the liquid-impermeable sheet,

And has a 1 st region overlapping at least a part of the absorbent core in the thickness direction and a 2 nd region located outside the 1 st region in the width direction and not overlapping the absorbent core in the thickness direction,

the number of the nonwoven fabrics arranged in the 1 st region is larger than the number of the nonwoven fabrics arranged in the 2 nd region,

the absorbent article has a plurality of high-density portions, the density of fibers constituting the plurality of nonwoven fabrics disposed on the non-skin side of the liquid-impermeable sheet is higher than that of the surrounding area,

the total area of the high-density portions located at the lateral portions of the 1 st region in the width direction divided by the area of the lateral portions is larger than the total area of the high-density portions located at the central portions of the 1 st region in the width direction divided by the area of the central portions,

the friction coefficient of the nonwoven fabric located closest to the non-skin side among the plurality of nonwoven fabrics is smaller than the friction coefficient of the nonwoven fabric located closer to the skin side than the nonwoven fabric.

2. The absorbent article of claim 1, wherein the absorbent article comprises,

the absorbent article has the high-density portion that spans the widthwise side edge of the 1 st region in the widthwise direction.

3. The absorbent article of claim 1, wherein the absorbent article comprises,

the number of the high-density portions is larger and the minimum interval between the high-density portions is smaller in the side portions of the 1 st region in the width direction than in the center portion of the 1 st region in the width direction.

4. The absorbent article of claim 1, wherein the absorbent article comprises,

the 1 st region is located at a position across an end portion in at least one of the width direction and the length direction of the absorbent core.

5. The absorbent article as in claim 4, wherein,

the absorbent article has leg elastic members extending and contracting in the longitudinal direction at the side portions in the width direction,

the 1 st region spans the end portion of the absorbent core in the width direction and is located further inward in the width direction than the leg hole elastic member.

6. The absorbent article as in claim 4, wherein,

the 1 st region spans the end portion of the absorbent core in the width direction and overlaps at least a part of the leg hole elastic member in the thickness direction.

7. The absorbent article as in claim 4, wherein,

the absorbent article has a three-dimensional gather portion capable of standing up toward the skin side on the lateral side of the absorbent article,

the 1 st region is located in a range outside the erection starting point in the width direction of the three-dimensional gather portion.

8. The absorbent article of claim 1, wherein the absorbent article comprises,

the plurality of nonwoven fabrics include a 1 st nonwoven fabric and a 2 nd nonwoven fabric having a length in the width direction longer than that of the 1 st nonwoven fabric,

the 1 st nonwoven fabric is disposed on the non-skin side of the 2 nd nonwoven fabric.

9. The absorbent article as in claim 8, wherein,

the absorbent article is a belt-type diaper having a target belt and a pair of fastening tapes,

the fastening tape extends outward in the width direction from a back side region abutting against the back side of the wearer,

The target tape is disposed in an abdomen-side region that abuts an abdomen side of a wearer and is engaged by the pair of fastening tapes,

the target tape extends beyond the 1 st nonwoven fabric in the widthwise direction.

10. The absorbent article of claim 1, wherein the absorbent article comprises,

the 1 st nonwoven fabric is disposed closer to the skin than the 2 nd nonwoven fabric.

11. The absorbent article of claim 1, wherein the absorbent article comprises,

the absorbent article has a crotch region that abuts the crotch of the wearer,

the 1 st region is disposed at least in the crotch region in the longitudinal direction.

12. The absorbent article as in claim 11, wherein,

the 1 st region is disposed at least over the entire region of the absorbent core in the longitudinal direction.

13. The absorbent article of claim 1, wherein the absorbent article comprises,

the absorbent article is a pants-type diaper in which a back side region abutting against a back side portion of a wearer and both side portions in the width direction of the wearer are joined together by a pair of joining portions,

The back side region and the abdominal side region respectively have a plurality of waist elastic members that stretch in the width direction,

the 1 st region is located in a region that does not overlap with the stretch portion of the waist elastic member in the thickness direction.

14. An absorbent article comprising a longitudinal direction, a width direction and a thickness direction,

The total area of the high-density portions located at the longitudinal ends of the 1 st region divided by the area of the ends is larger than the total area of the high-density portions located at the longitudinal center of the 1 st region divided by the area of the center,

the number of the high-density portions is larger and the minimum interval between the high-density portions is smaller at the end portions of the 1 st region in the longitudinal direction than at the central portion of the 1 st region in the longitudinal direction,

15. The absorbent article as in claim 14, wherein,

16. The absorbent article as in claim 15, wherein,

17. The absorbent article as in claim 15, wherein,

18. The absorbent article as in claim 15, wherein,

19. The absorbent article as in claim 14, wherein,

20. The absorbent article as in claim 19, wherein,

21. The absorbent article as in claim 14, wherein,

22. The absorbent article as in claim 14, wherein,

the absorbent article has a crotch region that abuts the crotch of the wearer,

23. The absorbent article as in claim 22, wherein,

24. The absorbent article as in claim 14, wherein,

25. An absorbent article comprising a longitudinal direction, a width direction and a thickness direction,

at an end portion in at least one of the width direction and the length direction of the 1 st region, the plurality of nonwoven fabrics are joined to each other with the high-density portion and an adhesive,

26. The absorbent article as in claim 25, wherein,

27. The absorbent article as in claim 26, wherein,

28. The absorbent article as in claim 26, wherein,

29. The absorbent article as in claim 26, wherein,

30. The absorbent article as in claim 25, wherein,

31. The absorbent article as in claim 30, wherein,

32. The absorbent article as in claim 25, wherein,

33. The absorbent article as in claim 25, wherein,

The absorbent article has a crotch region that abuts the crotch of the wearer,

34. The absorbent article as in claim 33, wherein,