CN109843241B

CN109843241B - Disposable diaper having a disposable diaper

Info

Publication number: CN109843241B
Application number: CN201780064116.3A
Authority: CN
Inventors: 福田优子; 梶原顺; 奥田泰之
Original assignee: Kao Corp
Current assignee: Kao Corp
Priority date: 2016-12-22
Filing date: 2017-11-21
Publication date: 2022-04-26
Anticipated expiration: 2037-11-21
Also published as: JP6353024B2; JP2018102428A; RU2738194C1; WO2018116733A1; CN109843241A

Abstract

A disposable diaper (1) is provided with an elastic body (71) stretch region (ST) in a back-side waist panel (FB). The back-side waist panel (FB) has a skin-side nonwoven fabric (5) made of hydrophobic fibers on the side closer to the skin of the wearer than the elastic body (71). The skin-side nonwoven fabric (5) has a hydrophilic region (4T) at a position spaced apart from the position of the outer edge (5B1) on the back-side region (B) side in the longitudinal direction (X) on the crotch region (C) side. The elastic body (71) has a linear elastic member (711), and the linear elastic member (711) is disposed between the outer end (1B) of the back region (B) in the longitudinal direction (X) and the outer end edge (4TB1) of the hydrophilic region (4T). In the stretchable region (ST) of the back-side waist panel (FB), an elastic body free region (NT) is provided between the inner end edge of the linear elastic member (711) closest to the hydrophilic region (4T) and the outer end edge (4TB1) of the hydrophilic region (4T).

Description

Disposable diaper having a disposable diaper

Technical Field

The present invention relates to a disposable diaper.

Background

A disposable diaper includes a so-called pants-type disposable diaper in which an outer covering is disposed outside a vertically long absorbent body including an absorbent body. The present applicant has previously proposed the following techniques: a hydrophilic web having long fibers highly oriented in the width direction is disposed on the back-side end flap of the outer cover of such a pants-type disposable diaper to absorb sweat and effectively prevent the occurrence of eczema, rash, mottle, and the like (for example, patent document 1).

Patent document 2 discloses a disposable diaper in which a sweat absorbing sheet for absorbing sweat is joined to a hydrophobic sheet covering the inner surfaces of front and rear waist regions of the diaper.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2006-141549

Patent document 2: japanese patent laid-open No. 2007 and 259874

Disclosure of Invention

The present invention is a disposable diaper having an abdomen-side region disposed on an abdomen side of a wearer, a back-side region disposed on a back side of the wearer, and a crotch region located therebetween, and having a longitudinal direction extending from the abdomen-side region to the back-side region and a transverse direction perpendicular to the longitudinal direction, the disposable diaper having an absorber spanning the abdomen-side region and the back-side region, and having an abdomen-side waist flap and a back-side waist flap located outside front and rear end portions in the longitudinal direction of the absorber and extending in the transverse direction. The back-side waist panel is formed with an elastic region formed of an elastic body disposed in an extended state in the lateral direction. In the stretchable region, the back-side waist panel has a skin-side nonwoven fabric made of hydrophobic fibers on a side closer to the skin of the wearer than the elastic body, among the nonwoven fabrics constituting the back-side waist panel. The skin-side nonwoven fabric has a hydrophilic region extending in the transverse direction at a position spaced apart from the crotch region side from the position of the outer edge of the skin-side nonwoven fabric on the back-side region side in the longitudinal direction. The elastic body constituting the stretchable region has at least one thread-like elastic member. The one linear elastic member is disposed between an outer edge of the back-side region in the longitudinal direction and an outer edge of the hydrophilic region on the back-side region side in the longitudinal direction. In the stretchable region of the back-side waist panel, an elastic body non-existing region is formed between an inner end edge of the one linear elastic member closest to the hydrophilic region side on the hydrophilic region side and an outer end edge of the hydrophilic region side on the back-side region side in the longitudinal direction thereof.

Drawings

Fig. 1 is a perspective view of a pants-type disposable diaper according to a preferred embodiment of the present invention.

Fig. 2 is a partially-cut-open plan view of the diaper shown in fig. 1 in an open and stretched state, as viewed from the skin contact surface side.

Fig. 3 is a sectional view taken along line III-III of fig. 1.

Fig. 4 is a vertical cross-sectional view of a stomach-side region a and a back-side region B of a pants-type disposable diaper according to another preferred embodiment of the present invention (corresponding to the view in fig. 3).

Fig. 5 is a longitudinal cross-sectional view of a stomach-side region a and a back-side region B of a pants-type disposable diaper according to still another preferred embodiment of the present invention (corresponding to the view in fig. 3).

Fig. 6 is a longitudinal cross-sectional view of a stomach-side region a and a back-side region B of a pants-type disposable diaper according to still another preferred embodiment of the present invention (corresponding to the view in fig. 3).

Fig. 7 is a vertical cross-sectional view of a stomach-side region a and a back-side region B of a pants-type disposable diaper according to another preferred embodiment of the present invention (corresponding to the view in fig. 3).

Detailed Description

As shown in

patent documents

1 and 2, when a separate sweat-absorbent sheet for absorbing sweat is attached to the waist of the outer package of a disposable diaper, the rigidity of the portion to which the sweat-absorbent sheet is attached increases, and the skin of the wearer is irritated or the edge of the sweat-absorbent sheet irritates the skin of the wearer, causing a symptom of redness of the skin.

Accordingly, it is an object of the present invention to provide a disposable diaper which can solve the above-mentioned drawbacks of the prior art.

The present invention will be described below based on preferred embodiments of the present invention with reference to the accompanying drawings.

The disposable diaper of the present invention has an abdominal region a disposed on the abdominal side of the wearer, a back region B disposed on the back side of the wearer, and a crotch region C located between the A, B, and has a longitudinal direction X extending from the abdominal region a to the back region B, and a lateral direction Y perpendicular to the longitudinal direction X. The disposable diaper of the present invention further includes an absorbent body 23 in the abdomen-side region a and the back-side region B, and an abdomen-side waist panel FA and a back-side waist panel FB extending in the transverse direction Y outside the front and

rear end portions

23A, 23B of the absorbent body 23 in the longitudinal direction X. Here, the abdomen-side region a is a region disposed on the abdomen side of the wearer when the disposable diaper is worn, and the back-side region B is a region disposed on the back side of the wearer when the disposable diaper is worn. The abdomen-side waist panel FA is a region in which a region extending in the lateral direction Y outside in the longitudinal direction X from the end edge 23A1 of the front end portion 23A on the abdomen-side region a side in the longitudinal direction X of the absorbent body 23 and a region extending in the lateral direction Y from the front end portion 23A on the abdomen-side region a side in the longitudinal direction X of the absorbent body 23 are combined. The back-side waist panel FB refers to a region in which a region extending in the lateral direction Y from the end edge 23B1 of the rear end portion 23B on the back-side region B side in the longitudinal direction X of the absorbent body 23, which is located outside in the longitudinal direction X, and a region extending in the lateral direction Y from the rear end portion 23B on the back-side region B side in the longitudinal direction X of the absorbent body 23 are combined.

Fig. 1 and 2 show a pants-type disposable diaper 1 (hereinafter also referred to as "diaper 1") as an embodiment of the disposable diaper of the present invention. As shown in fig. 1 and 2, the diaper 1 includes an absorbent main body 2 and an outer cover 3 disposed on a non-skin-facing surface side of the absorbent main body 2 and fixing the absorbent main body 2, and the outer cover 3 includes a front waist panel FA and a back waist panel FB extending in a transverse direction Y outside front and

rear end portions

23A, 23B in a longitudinal direction X of an absorbent body 23 constituting the absorbent main body 2. The diaper 1 is a disposable diaper in which a pair of side seals S, S, a waist opening WH, and a pair of leg openings LH, LH are formed by joining left and right side edge portions 3a1, 3a1 of a ventral region a of an outer package 3 to left and right side edge portions 3B1, 3B1 of a back region B of the outer package 3. As shown in fig. 2, the outer package 3 of the diaper 1 is preferably divided into a ventral region a disposed on the ventral side of the wearer when worn, a back-side region B disposed on the back side of the wearer when worn, and a crotch region C between the ventral region a and the back-side region B, in an extended state in plan view.

The state in which the diaper 1 is developed and extended is a state in which the diaper 1 is developed by tearing the side seal S, and the elastic body of each part of the diaper 1 in the developed state is extended to a designed size (the same size as when it is developed to be flat in a state in which the influence of the elastic body is completely eliminated), as shown in fig. 2.

In the present specification, the "skin-facing surface" is a surface of the diaper 1 or its constituent members which faces the skin side of the wearer when worn, and the "non-skin-facing surface" is a surface of the diaper 1 or its constituent members which faces the opposite side (the clothing side) to the skin side of the wearer when worn. In the diaper 1, the longitudinal direction (X direction) is a direction from the abdomen-side region a to the back-side region B in a flat developed and stretched state. The lateral direction (Y direction) is a direction perpendicular to the longitudinal direction (X direction), and is the width direction of the diaper 1 in a flat-developed and extended state.

Further, the diaper 1 has a left-right symmetrical shape with respect to a longitudinal centerline CL1 extending in the longitudinal direction (X direction) as shown in fig. 2. CL2 in fig. 2 is a transverse centerline extending in the transverse direction (Y direction) bisecting diaper 1 in the longitudinal direction (X direction), and is orthogonal to longitudinal centerline CL 1.

In the diaper 1, the absorbent body 2 has a vertically long shape that is relatively long in the longitudinal direction (X direction) in a state in which the diaper 1 is unfolded and extended as shown in fig. 2. The absorbent main body 2 includes a liquid-permeable front sheet 21 forming a skin-facing surface, a liquid-impermeable (including water-repellent) back sheet 22 forming a non-skin-facing surface, and a liquid-retentive absorbent body 23 disposed between the two

sheets

21, 22. In the diaper 1, the absorbent core 231 having absorbent performance is covered with the liquid-permeable covering sheet 232 to form the absorbent body 23, the entire length of the absorbent main body 2 in the longitudinal direction (X direction) is the same as the entire length of the absorbent body 23 in the longitudinal direction (X direction), and the outer edges 23A1, 23B1 of the front and

rear end portions

23A, 23B of the absorbent body 23 are located at the same positions as the outer edges of the front and rear end portions of the absorbent main body 2 as shown in fig. 2. As shown in fig. 2,

leakage preventing cuffs

24 and 24 each having an elastic body 25 arranged in an elongated state in the longitudinal direction (X direction) are provided on both side portions of the absorbent main body 2 in the longitudinal direction (X direction). Specifically, the leakage preventive cuffs 24 are made of a liquid-impermeable, water-repellent, and air-permeable material, and the leakage preventive cuff-forming elastic bodies 25 are disposed in the vicinity of the free ends of the respective leakage preventive cuffs 24 so as to be elongated in the longitudinal direction (X direction). When the diaper is worn, the free end portion side of the leakage-preventing cuffs 24 rises due to contraction of the leakage-preventing cuff-forming elastic bodies 25, and the body fluid is prevented from flowing out in the lateral direction (Y direction).

The absorbent body 2 configured as described above is joined to the central portion of the outer cover 3 via the body-fixing adhesive so that the longitudinal direction (X direction) thereof coincides with the longitudinal direction (X direction) of the diaper 1 in the unfolded and extended state, as shown in fig. 2. In this way, the outer cover 3 is disposed on the non-skin-facing surface side of the back sheet 22 constituting the absorbent main body 2 in the thickness direction of the disposable diaper 1 and is fixed by adhesion. Therefore, in the diaper 1, the absorber 23 constituting the absorbent body 2 is disposed across the abdomen-side region a and the back-side region B.

In the diaper 1, as shown in fig. 2 and 3, the abdomen-side waist panel FA and the back-side waist panel FB extending in the transverse direction Y outside the front and

rear end portions

23A, 23B of the absorbent body 23 in the longitudinal direction X are respectively formed with stretchable regions ST formed by elastic bodies 71 arranged in a stretched state in the transverse direction (Y direction). In the diaper 1, the outer package 3 is preferably configured as a laminate including an outer sheet 6 forming a non-skin-facing surface which is an outer surface of the diaper 1 when worn, and an inner sheet 5 disposed to face a skin-facing surface of the outer sheet 6. When the diaper 1 is worn, the outer sheet 6 is positioned on the side farther from the skin of the wearer to form a non-skin-facing surface (outer surface) of the diaper 1, and the inner sheet 5 is positioned on the side closer to the skin of the wearer than the outer sheet 6 to form a skin-facing surface (inner surface) of the diaper 1. The outer layer sheet 6 and the inner layer sheet 5 are joined to each other at predetermined positions by joining means such as an adhesive, heat sealing, high-frequency sealing, ultrasonic sealing, or the like. As shown in fig. 2, the outer sheet 6 has, in the abdominal region a and the back region B, folded-back portions 6E of the outer layer extending from the outer edge 5B1 in the longitudinal direction X of the inner sheet 5 and folded back toward the skin-facing surface side of the inner sheet 5 along the peripheral edge of the waist opening WH, and the folded-back portions 6E of the outer layer cover the front and

rear end portions

23A, 23B in the longitudinal direction X of the absorbent body 23, that is, the front and rear end portions in the longitudinal direction X of the absorbent main body 2. The folded-back portion 6E of the outer layer and the inner layer sheet 5 are joined to each other at a predetermined position by joining means such as an adhesive, heat seal, high-frequency seal, ultrasonic seal, or the like.

As described above, in the diaper 1, the outer package 3 has, as shown in fig. 2, the outer sheet 6 forming the non-skin-facing surface side of the outer surface of the diaper 1, the folded-back portion 6E of the outer sheet closest to the skin-facing surface side, and the inner sheet 5 disposed between the outer sheet 6 and the folded-back portion 6E of the outer sheet. In the diaper 1, the outer sheet 6 and the inner sheet 5 except for the folded-back portion 6E of the outer layer are formed so as to be inwardly narrowed toward the longitudinal centerline CL1 at the longitudinal (X-direction) center portion and have the same shape and the same size. The folded-back portion 6E of the outer layer formed by the folded-back portion 6E of the outer layer sheet 6 is formed into a laterally (Y-direction) long rectangle. The folded-back portion 6E of the outer layer, the inner layer sheet 5 and the outer layer sheet 6 may be separate sheets, but in the diaper 1, the folded-back portion 6E of the outer layer is formed by the folded-back portion of the outer layer sheet 6. As described above, the diaper 1 includes the folded-back portion 6E of the outer layer and the inner sheet 5 in the abdomen-side waist panel FA and the back-side waist panel FB, respectively, and further includes the outer sheet 6 on the non-skin-facing surface side of the inner sheet 5.

In the diaper 1, as shown in fig. 2, the outer cover 3 has a plurality of linear or band-like elastic bodies 71 that are intermittently arranged in the longitudinal direction (X direction) and are stretched in the transverse direction (Y direction) between the inner sheet 5 and the outer sheet 6. The diaper 1 has a plurality of elastic members 71, thereby forming an extensible region ST having a waist portion extensible part G1 and a lower waist portion extensible part G2. As shown in fig. 2, the diaper 1 has a plurality of linear or band-shaped leg elastic members 72 extending between the inner sheet 5 and the outer sheet 6. The diaper 1 has a plurality of leg elastic members 72, thereby forming leg stretch units G3. As shown in fig. 2, the leg stretch portion G3 is formed in the peripheral edge of the leg opening LH.

In the diaper 1, as shown in fig. 2, the waist stretch units G1 are formed in end flaps located on the outer side in the longitudinal direction X (the side opposite to the side of the transverse centerline CL 2) than the outer ends 23A1, 23B1 of the front and

rear end portions

23A, 23B in the longitudinal direction (X direction) of the absorbent body 23 constituting the absorbent main body 2. In the diaper 1, the waist lower stretch units G2 are formed in the side flaps between the lower ends of the waist stretch units G1 on the side of the transverse centerline CL2 and the lower ends of the side seals S in the longitudinal direction (X direction). The back-side waist panel FB and the abdomen-side waist panel FA are also regions in which the end panel (waist stretch unit G1) and a part of the side panel (waist lower stretch unit G2) are joined.

In the diaper 1, the outer package 3 has a plurality of joint portions 8 for joining the inner sheet 5 and the outer sheet 6 as shown in fig. 2. In the diaper 1, the back-side waist panel FB and the abdomen-side waist panel FA are formed such that the inner sheet 5 and the outer sheet 6 are joined and fixed at a plurality of joining portions 8 arranged in a scattered manner and formed by thermal welding. In the diaper 1, in the region from the waist stretch units G1 to the lower waist stretch units G2 in each of the abdomen-side region a and the back-side region B, the inner sheet 5 and the joint 8 of the outer sheet 6 are intermittently arranged in a row in the longitudinal direction (X direction), and a plurality of rows of joint rows 8L formed by the plurality of joint 8 are arranged at intervals in the transverse direction (Y direction).

As shown in fig. 2, the diaper 1 has a plurality of elastic bodies 71 arranged in a state of being elongated in the transverse direction (Y direction) and intermittently arranged in the longitudinal direction (X direction) between the inner sheet 5 and the outer sheet 6 fixed by the joint 8. In the diaper 1, preferably, the elastic bodies 71 are arranged in a state of being stretched in the lateral direction (Y direction) in the region from the waist stretch unit G1 to the lower waist stretch unit G2 in each of the abdomen-side region a and the back-side region B through the gaps between the joint portions 8 in each of the joint line 8L.

In the diaper 1, as shown in fig. 2, the inner sheet 5 and the outer sheet 6 have a pair of outer fixing regions 3T1 and 3T1 joined to each other via an elastomer fixing adhesive at both side edges 3a1 and 3a1 of the front region a of the outer casing 3 and both side edges 3B1 and 3B1 of the back region B of the outer casing 3, and the inner sheet 5 and the outer sheet 6 have a pair of main body fixing regions 3T2 and 3T2 joined to each other via an elastomer fixing adhesive in the vicinity of both side portions of the absorbent main body 2 in the longitudinal direction (X direction).

In the waist stretch unit G1 of the diaper 1, as shown in fig. 2, a plurality of elastic bodies 71 are disposed across the pair of outer fastening regions 3T1, 3T1, and these elastic bodies 71 are fixed between the inner sheet 5 and the outer sheet 6 in each of the pair of outer fastening regions 3T1, 3T1, but are not fixed to either of the inner sheet 5 and the outer sheet 6 between the pair of outer fastening regions 3T1, 3T 1.

In the lower waistline stretch unit G2 of the diaper 1, as shown in fig. 2, a plurality of elastic bodies 71 are disposed across the outer fastening region 3T1 and the main body side fastening region 3T2, and these elastic bodies 71 are fixed between the inner sheet 5 and the outer sheet 6 in each of the outer fastening region 3T1 and the main body side fastening region 3T2, but are not fixed to either of the inner sheet 5 and the outer sheet 6 between the outer fastening region 3T1 and the main body side fastening region 3T 2. In the lower waist stretch unit G2 of the diaper 1, the elastic body 71 is not disposed between the pair of main body side fixing regions 3T2 and 3T2, or the elastic body 71 is disposed in a state of being finely divided so as not to exhibit elastic stretchability.

As shown in fig. 2, in the leg stretch units G3 of the diaper 1, the plurality of leg elastic bodies 72 disposed in an extended state at the peripheral edge of the leg opening LH are fixed between the inner sheet 5 and the outer sheet 6 via an elastic body fixing adhesive disposed in a planar state at the peripheral edge of the leg opening LH.

As shown in fig. 1 and 2, in the outer cover 3 of the diaper 1, the waist stretch units G1 and the lower waist stretch units G2 are formed with gathers formed by deforming the outer sheet 6 so as to bulge outward between the

joint line

8L, 8L adjacent in the transverse direction (Y direction) by contraction of a plurality of elastic bodies 71 arranged between the inner sheet 5 and the outer sheet 6 in an extended state in the transverse direction (Y direction) and intermittently arranged in the longitudinal direction (X direction), and the folded-back portions 6E of the outer layer and the inner sheet 5 so as to bulge inward.

In the diaper 1, in the stretchable region ST, the back-side waist panel FB has a skin-side nonwoven fabric made of hydrophobic fibers on the side closer to the skin of the wearer than the elastic body 71 in the nonwoven fabric constituting the back-side waist panel FB. In the diaper 1, as shown in fig. 3, the nonwoven fabric constituting the back-side waist panel FB corresponds to the inner sheet 5, the outer sheet 6, and the folded-back portion 6E of the outer sheet, and the nonwoven fabric on the skin side of the wearer with respect to the elastic body 71 corresponds to the folded-back portion 6E of the inner sheet 5 and the outer sheet 6. In the diaper 1, the skin-side nonwoven fabric made of hydrophobic fibers corresponds to the inner-layer sheet 5.

In the diaper 1, as shown in fig. 3, the skin-side nonwoven fabric (inner sheet 5) made of hydrophobic fibers has hydrophilic regions 4T extending in the transverse direction Y at positions spaced apart from the outer edge 5B1 of the skin-side nonwoven fabric (inner sheet 5) on the back-side region B side in the longitudinal direction X toward the crotch region C side. In the diaper 1, for example, a hydrophilizing agent is applied to the inner sheet 5 at spaced positions on the crotch region C side from the position of the outer edge 5B1 in the longitudinal direction X over the entire length in the transverse direction Y to form hydrophilic regions 4T. As described above, the hydrophilic region 4T is not formed of a separate nonwoven fabric from the skin-side nonwoven fabric, but is formed by applying a hydrophilizing agent to a part of the skin-side nonwoven fabric made of hydrophobic fibers. In the diaper 1, the hydrophilic region 4T is formed at a position spaced apart from the outer end 1B in the longitudinal direction X in the back-side region B of the diaper 1, in other words, the outer peripheral edge of the peripheral portion of the waist opening WH on the crotch region C side.

In the diaper 1, as shown in fig. 2, a hydrophilic region 4T capable of absorbing sweat is disposed in the stretch region ST of the back-side waist panel FB. In the diaper 1, the hydrophilic region 4T having hydrophilicity is disposed in the stretch region ST of the back-side waist panel FB, i.e., a region where the waist stretch unit G1 and the lower waist stretch unit G2 are partially united.

As the hydrophilizing agent for forming the hydrophilic region 4T, a known hydrophilizing agent used for an absorbent article such as a disposable diaper can be used. In the diaper 1, the hydrophilic region 4T is formed only in the back-side waist panel FB, but may be formed in the back-side waist panel FB and the abdomen-side waist panel FA. In this manner, when the hydrophilic regions 4T are formed in the back-side waist panel FB and the abdomen-side waist panel FA, the amount of the hydrophilizing agent applied to the skin-side nonwoven fabric (for example, the inner sheet 5) is preferably the same on the abdomen-side waist panel FA side and the back-side waist panel FB side, and the degree of hydrophilicity of the hydrophilic regions 4T on the abdomen-side waist panel FA side is preferably the same as the degree of hydrophilicity of the hydrophilic regions 4T on the back-side waist panel FB side.

In the diaper 1, the hydrophilic region 4T is disposed over the entire length of the back-side waist panel FB in the transverse direction (Y direction) as shown in fig. 2, and is disposed closer to the skin of the wearer than the elastic body 71 as shown in fig. 3. In other words, in the back-side waist panel FB, the hydrophilizing agent is applied to the entire length in the lateral direction (Y direction) of the inner sheet 5 closer to the skin of the wearer than the elastic body 71 to form the hydrophilic region 4T in the back-side waist panel FB.

In the diaper 1, from the viewpoint of absorbing a large amount of sweat on the back side of the wearer when worn, as shown in fig. 2, the length (L1) of the hydrophilic region 4T in the longitudinal direction (X direction) is preferably 10mm or more, more preferably 20mm or more, and is preferably 100mm or less, more preferably 90mm or less, specifically preferably 10mm or more and 100mm or less, more preferably 20mm or more and 90mm or less. The length (L1) is a length in a state where the diaper 1 is unfolded and extended.

In the diaper 1, as shown in fig. 3, the elastic body 71 constituting the stretch region ST of the back-side waist panel FB has at least one linear elastic member 711, and the one linear elastic member 711 is disposed between the outer end 1B in the longitudinal direction X of the back-side region B and the outer end 4TB1 on the back-side region B side in the longitudinal direction (X direction) of the hydrophilic region 4T. The outer edge 1B in the longitudinal direction (X direction) of the back region B is a position of the peripheral edge of the waist opening WH in the diaper 1. In the diaper 1, preferably, only one linear elastic member 711 is disposed at the outer end portion 5B on the back-side region B side in the longitudinal direction X of the skin-side nonwoven fabric (inner sheet 5) on which the hydrophilic region 4T is formed, specifically, between the outer end edge 5B1 in the longitudinal direction (X direction) of the inner sheet 5 and the outer end edge 4TB1 in the longitudinal direction (X direction) of the hydrophilic region 4T.

In the diaper 1, as shown in fig. 3, in the stretchable region ST of the back-side waist panel FB, an elastic body non-existing region NT is formed between the inner end edge of the at least one linear elastic member 711 on the hydrophilic region 4T side closest to the hydrophilic region 4T side and the outer end edge 4TB1 on the back-side region B side in the longitudinal direction X in the hydrophilic region 4T of the skin-side nonwoven fabric (inner sheet 5). Here, the inner end edge of the linear elastic member 711 on the hydrophilic region 4T side is the position closest to the lower end of the crotch region C side when the cross section of the linear elastic member 711 is viewed as shown in fig. 3. A plurality of linear elastic members 711 may be disposed at the outer end portion 5B in the longitudinal direction X of the inner layer sheet 5, but as described above, in the diaper 1, only one linear elastic member 711 is disposed at the outer end portion 5B of the inner layer sheet 5. Therefore, in the diaper 1, the elastic body non-existing region NT is formed between the inner end edge of the one linear elastic member 711 and the outer end edge 4TB1 in the longitudinal direction X of the hydrophilic region 4T. The elastic body-free region NT is formed over the entire length of the back-side waist panel FB in the transverse direction (Y direction).

In the diaper 1, the length (L2) in the longitudinal direction (X direction) of the elastomer-free region NT is preferably 3mm or more, more preferably 4mm or more, and is preferably 15mm or less, more preferably 13mm or less, specifically preferably 3mm or more and 15mm or less, more preferably 4mm or more and 13mm or less, from the viewpoint of preventing moisture from moving from the hydrophilic region 4T which absorbs sweat of the wearer when worn, as shown in fig. 3. The length (L2) is a length in a state where the diaper 1 is unfolded and extended.

The materials for forming the various parts of the diaper 1 will be described.

In the diaper 1, the folded-back portion 6E constituting the outer layer of the outer cover 3 is formed by the folded-back portion 6E of the outer sheet 6, and therefore the entire outer sheet 6 including the folded-back portion 6E of the outer layer is formed of a hydrophobic sheet made of hydrophobic fibers. In the diaper 1, the inner sheet 5, which is separate from the outer sheet 6, is also composed of a hydrophobic sheet.

Examples of the hydrophobic fibers constituting the hydrophobic sheet used for the outer sheet 6 (including the folded-back portion 6E of the outer layer) and the inner sheet 5 include thermoplastic synthetic fibers, and specifically, materials generally used as constituent fibers of various nonwoven fabrics, for example, polyolefin fibers such as Polyethylene (PE) fibers and polypropylene (PP) fibers; fibers made of thermoplastic resins such as polyethylene terephthalate (PET) and polyamide alone; core-sheath type, side-by-side type, and the like.

The hydrophilizing agent for forming the hydrophilic region 4T is not particularly limited as long as it is a general hydrophilizing agent for use in sanitary products. Whether the fibers constituting the hydrophilic region 4T are hydrophilic or hydrophobic can be determined based on the contact angle of the constituting fibers measured in [ method for measuring contact angle of fiber ] as described below. Specifically, when the contact angle is 90 ° or more, the water repellency is judged to be low in hydrophilicity, and when the contact angle is less than 90 °, the hydrophilicity is judged to be high.

[ method of measuring contact Angle of fiber ]

The contact angle is measured using, for example, a contact angle meter MCA-J manufactured by Kyowa Kagaku K.K. Specifically, the ion-exchanged water was dropped on the surface (about 20 picoliters) of the fiber constituting the hydrophilic region 4T, and immediately thereafter, the contact angle was measured using the contact angle meter. The contact angle is determined by measuring the position of 5 or more points of the fiber constituting the hydrophilic region 4T and taking the average value of these as the contact angle. The measurement environment temperature was set to 20 ℃.

In the case where the region (for example, hydrophilic region) is taken out from the diaper 1 as an example of the absorbent article and evaluated and measured, when the region is fixed to another component by an adhesive, welding, or the like, the region is measured at the portion which is not fixed or taken out after removing the fixed portion. In this case, from the viewpoint of minimizing the influence on the hydrophilizing agent applied to the region, it is preferable to use a method which does not involve application of a solvent and blowing of hot air with a dryer, which may cause deterioration or loss of the oil agent, as a method for removing the fixed part.

As the front sheet 21, the back sheet 22, the absorber 23, the leakage preventing cuffs 24, and the like constituting the absorbent main body 2, various materials conventionally used for absorbent articles such as disposable diapers can be used without particular limitation. For example, a single-layer or multi-layer nonwoven fabric, an apertured film, or the like can be used as the front sheet 21. As the back sheet 22, a moisture-permeable resin film or the like can be used. As the absorbent core 231 of the absorbent body 23, an absorbent core made of particles of absorbent polymer and fiber material can be used, and as the cover sheet 232 of the absorbent body 23, tissue paper, nonwoven fabric or the like can be used. As the leak-proof cuff 24, a water repellent nonwoven fabric having a single-layer or multi-layer structure can be used.

Examples of the elastic body (the elastic body 25 for forming the leakage preventing cuff, the elastic body 71, the leg elastic body 72, and the like) include synthetic rubbers such as styrene-butadiene, isoprene, and chloroprene rubber, natural rubbers, EVA, elastic polyolefins, and polyurethane. As the form of the elastic body, a linear (such as a thread rubber) or ribbon (such as a rubber strip) form having a rectangular, square, circular, elliptical, polygonal or the like cross section, a form of an elastic fiber layer, or the like can be preferably used.

As the elastomer-fixing adhesive for fixing the elastic bodies (the elastic bodies 25, the elastic bodies 71, the leg elastic bodies 72, and the like) and the body-fixing adhesive for fixing the outer cover 3, the absorbent body 2, and the like, various hot-melt adhesives and the like conventionally used for absorbent articles such as disposable diapers can be used without particular limitation.

The operation and effect when the diaper 1 according to the embodiment of the present invention is used will be described.

In the diaper 1, as shown in fig. 2 and 3, in the stretchable region ST of the back-side waist panel FB, a hydrophilic region 4T capable of absorbing sweat is disposed at a position spaced apart from the position of the outer end edge 5B1 in the longitudinal direction X in the skin-side nonwoven fabric (inner sheet 5). The hydrophilic region 4T is not formed of a separate nonwoven fabric from the skin-side nonwoven fabric, but is formed by applying a hydrophilizing agent to a part of the skin-side nonwoven fabric (inner sheet 5) made of hydrophobic fibers. Therefore, even if the hydrophilic region 4T is disposed, the rigidity of the stretchable region ST of the back-side waist panel FB is unlikely to increase and the edges of the hydrophilic region 4T do not irritate the skin of the wearer while the diaper 1 is worn, so that the skin redness is unlikely to occur and skin problems such as eczema, miliaria, and macules can be expected to be reduced. In the diaper 1, as shown in fig. 3, in the stretchable region ST of the back-side waist panel FB, an elastic body non-existence region NT is formed between the inner end edge of the linear elastic member 711 located closest to the hydrophilic region 4T on the hydrophilic region 4T side and the outer end edge 4TB1 in the longitudinal direction X formed in the hydrophilic region 4T of the inner sheet 5. Since the elastomer-free region NT is a hydrophobic region and the fibers are less likely to be densified due to contraction of the elastomer 71, even when the hydrophilic region 4T absorbs a large amount of sweat while the diaper 1 is worn, the bodily fluid is less likely to move to the outside in the longitudinal direction X, and the sweat can be absorbed in the hydrophilic region 4T, and skin problems such as eczema, miliaria, and macules can be expected to be reduced. From the viewpoint of absorbing sweat in the hydrophilic region 4T as described above, it is preferable that the hydrophilic region 4T and the elastic body 71 disposed at a position corresponding to the hydrophilic region 4T are disposed in such a manner that the other linear elastic member 712 adjacent to the one linear elastic member 711 in the longitudinal direction X is disposed at a position spaced apart from the outer edge 4TB1 on the back-side region B side in the longitudinal direction X in the hydrophilic region 4T on the crotch region C side, as shown in fig. 3.

From the viewpoint of more reliably achieving the above-described effects, the diaper 1 preferably has one or two or more configurations as follows.

In the diaper 1, as shown in fig. 3, the outer edge 4TB1 on the back-side region B side in the longitudinal direction X in the hydrophilic region 4T of the skin-side nonwoven fabric (inner sheet 5) is preferably disposed at a corresponding portion in a region sandwiched between the outer edge 23B1 of the rear end portion 23B on the back-side region B side in the longitudinal direction (X direction) of the absorbent body 23 and the outer edge 1B in the longitudinal direction X in the back-side region B of the diaper 1. When the hydrophilic region 4T is formed further outside in the longitudinal direction X than the outer end edge 23B1 of the absorbent body 23 and further inside in the longitudinal direction X than the outer end edge on the back-side region B side of the diaper 1 in this way, sweat can be effectively absorbed by the hydrophilic region 4T in the waist stretch section G1 where sweat is particularly likely to occur.

In the diaper 1, the elastic body 71 includes, in addition to the single linear elastic member 711, another linear elastic member 712 adjacent to the linear elastic member 711, and the linear elastic member 711 and the other linear elastic member 712 are preferably disposed at corresponding portions in a region sandwiched between the position of the outer end 5B1 of the outer end 5B on the back-side region B in the longitudinal direction X in the skin-side nonwoven fabric (inner sheet 5) and the outer end 4TB1 on the back-side region B in the longitudinal direction X in the hydrophilic region 4T. When the plurality of elastic bodies 71 (the linear elastic members 711 and the other linear elastic members 712) are arranged in the water-repellent region outside the outer end edge 4TB1 in the longitudinal direction X of the hydrophilic region 4T in the skin-side nonwoven fabric (the inner sheet 5) in this manner, a dense structure is easily formed in the longitudinal direction X by contraction of the plurality of elastic bodies 71 in the water-repellent region, and a high-density portion of fibers formed by contraction of the elastic bodies 71 is easily brought close to the skin side of the wearer, whereby leakage of body fluid from the outer end edge 5B1 of the outer end portion 5B of the skin-side nonwoven fabric (the inner sheet 5) can be prevented.

In the diaper 1, the inner end 4TC1 of the inner end portion on the crotch region C side in the longitudinal direction X in the hydrophilic region 4T of the skin-side nonwoven fabric (inner sheet 5) is preferably disposed at a corresponding portion in a region sandwiched by the outer end 23B1 on the back-side region B side in the longitudinal direction X in the absorbent body 23 and the outer end 1B in the longitudinal direction X in the back-side region B of the diaper 1, as shown in fig. 3. Further, the inner end 4TC1 on the crotch region C side in the longitudinal direction X of the hydrophilic region 4T is more preferably disposed at a corresponding portion in a region sandwiched between the outer end on the back-side region B side in the longitudinal direction X and the outer end in the longitudinal direction X of the back-side region B of the diaper 1 in the absorbent body 2 having the absorbent body 23. As described above, when the inner end edge 4TC1 of the hydrophilic region 4T is disposed at a position farther outward in the longitudinal direction X than the outer end edge 23B1 of the absorbent body 23, the body fluid absorbed in the absorbent body 23 during use of the diaper 1 can be prevented from diffusing into the hydrophilic region 4T by the hydrophobic fibers (the hydrophobic fibers constituting the skin-side nonwoven fabric) constituting the region between the hydrophilic region 4T and the absorbent body 23.

In the diaper 1, the elastic body 71 is a plurality of string-like (including belt-like) elastic bodies 71, and as shown in fig. 3, the string-like elastic members 713 other than the single string-like elastic member 711 are preferably disposed in corresponding portions in a region sandwiched between an inner end edge 4TC1 of an inner end portion on the crotch region C side in the longitudinal direction X in the hydrophilic region 4T of the skin-side nonwoven fabric (inner sheet 5) and an outer end edge 23B1 on the back-side region B side in the longitudinal direction X in the absorbent body 23. When the linear elastic members 713 are disposed between the hydrophilic region 4T and the absorbent body 23 in this manner, the hydrophilic region 4T can be further spaced from the absorbent body 23, and leakage of the body fluid absorbed in the absorbent body 23 is less likely to be induced during use of the diaper 1.

In the diaper 1, as shown in fig. 3, the nonwoven fabric constituting the back-side waist panel FB is the inner sheet 5, the outer sheet 6, and the folded back portion 6E of the outer sheet, and the skin-side nonwoven fabric made of hydrophobic fibers is the inner sheet 5. In the diaper 1, the folded-back portion 6E of the outer sheet 6 is disposed on the skin-facing surface side of the skin-side nonwoven fabric (inner sheet 5) including the hydrophilic region 4T. In the diaper 1 having such a configuration, the folded-back portion 6E of the outer sheet 6 disposed on the skin-facing surface side of the skin-side nonwoven fabric (inner sheet 5) including the hydrophilic region 4T is preferably a hydrophobic nonwoven fabric made of hydrophobic fibers. Further, if the folded portion 6E of the outer layer is a hydrophobic nonwoven fabric, the outer layer sheet 6 is also a hydrophobic nonwoven fabric. When the hydrophobic nonwoven fabric is disposed on the skin-facing surface side of the hydrophilic region 4T, the hydrophilic region 4T having absorbed sweat through the folded back portion 6E of the outer layer does not directly contact the skin of the wearer, and the body fluid is less likely to return from the hydrophilic region 4T to the skin, so that the skin is less likely to swell, and skin problems such as rash can be expected to be reduced. In addition, from the viewpoint that the hydrophilic region 4T is likely to absorb sweat through the folded-back portion 6E of the outer layer, it is preferable that the skin-side nonwoven fabric (inner sheet 5) and the folded-back portion 6E of the outer layer made of the hydrophobic nonwoven fabric are fixed to each other at the heat-welded portion disposed in the hydrophilic region 4T of the skin-side nonwoven fabric. That is, the nonwoven fabric (inner sheet 5) and the folded-back portion 6E of the hydrophobic outer layer are preferably fixed to the hydrophilic region 4T at a plurality of bonding portions (heat-fusion bonding portions) formed by heat-fusion bonding, which are arranged in a dispersed state. Such a heat-fused portion can be formed by various known methods such as heat sealing, ultrasonic sealing, and high-frequency sealing.

The present invention has been described above based on preferred embodiments of the present invention, but the present invention is not limited to the above embodiments and can be appropriately modified. In the disposable diaper of the other embodiment shown below, the same portions as those of the diaper 1 shown in fig. 3 are denoted by the same reference numerals.

For example, in the diaper 1, as shown in fig. 3, the nonwoven fabric constituting the back-side waist panel FB corresponds to the inner sheet 5, the outer sheet 6 and the folded-back portion 6E of the outer sheet, the nonwoven fabric closer to the skin side of the wearer than the elastic body 71 corresponds to the folded-back portion 6E of the inner sheet 5 and the outer sheet 6, and the skin-side nonwoven fabric made of hydrophobic fibers corresponds to the inner sheet 5, but as in the diaper 1 shown in fig. 4, the skin-side nonwoven fabric made of hydrophobic fibers may be the folded-back portion 6E of the outer sheet 6. Specifically, in the diaper 1 shown in fig. 4, the hydrophilic region 4T is formed in the folded back portion 6E of the outer layer of the skin-side nonwoven fabric, and the inner end edge 4TC1 of the inner end portion on the side of the crotch region C in the longitudinal direction X in the hydrophilic region 4T is disposed closer to the outer end edge 1B in the longitudinal direction X of the back region B than the inner end edge 6EC1 of the inner end portion on the side of the crotch region C in the longitudinal direction X in the folded back portion 6E of the outer layer. Further, in the diaper 1 shown in fig. 4, the inner end 4TC1 on the crotch region C side of the hydrophilic region 4T formed in the folded-back portion 6E of the outer layer is disposed at a position closer to the outer end 1B in the longitudinal direction X of the back-side region B than the outer end 23B1 on the back-side region B side in the longitudinal direction X in the absorbent body 23. According to the diaper 1 shown in fig. 4, the same effect as that of the diaper 1 shown in fig. 3 can be obtained, and in particular, the hydrophilic region 4T is formed in the folded-back portion 6E of the outer layer, so that even when the front sheet 21 and the back sheet 22 extend to the outer end edge 1B side in the longitudinal direction X of the back region B, the effect of easily absorbing sweat and expanding the sweat absorbing region can be obtained.

In the diaper 1, as shown in fig. 3, the nonwoven fabric constituting the back-side waist panel FB corresponds to the inner sheet 5, the outer sheet 6 and the folded-back portion 6E of the outer layer, but in the diaper 1 shown in fig. 5, in addition to the inner sheet 5, the outer sheet 6 and the folded-back portion 6E of the outer layer, the folded-back portion 5E of the inner layer folded back toward the skin-facing surface side from the outer end edge 1B in the longitudinal direction X of the back-side region B in the inner sheet 5 corresponds to this. In the diaper 1 shown in fig. 5, the nonwoven fabric on the skin side of the wearer with respect to the elastic body 71 corresponds to the inner sheet 5, the folded back portion 5E of the inner layer, and the folded back portion 6E of the outer layer, and the skin side nonwoven fabric made of hydrophobic fibers corresponds to the folded back portion 5E of the inner layer. Specifically, in the diaper 1 shown in fig. 5, the hydrophilic region 4T is formed in the folded-back portion 5E which is the inner layer of the skin-side nonwoven fabric, and the inner end edge 4TC1 which is the inner end portion on the side of the crotch region C in the longitudinal direction X in the hydrophilic region 4T is disposed closer to the outer end edge 1B in the longitudinal direction X in the back region B than the inner end edge 5EC1 which is the inner end portion on the side of the crotch region C in the longitudinal direction X in the folded-back portion 5E of the inner layer. Further, in the diaper 1 shown in fig. 5, the inner end 4TC1 on the crotch region C side of the hydrophilic region 4T formed in the folded back portion 5E of the inner layer is disposed at a position closer to the outer end 1B in the longitudinal direction X of the back-side region B than the outer end 23B1 on the back-side region B side in the longitudinal direction X in the absorbent body 23. According to the diaper 1 shown in fig. 5, the same effects as those of the diaper 1 shown in fig. 3 can be obtained, and in particular, the hydrophilic region 4T is formed in the folded-back portion 5E of the inner layer. Therefore, the hydrophilic region 4T formed in the folded portion 5E of the inner layer and the folded portion 6E of the hydrophobic outer layer are easily fixed at a plurality of bonding portions (heat-fusion portions) formed by heat fusion disposed in a scattered manner, and the folded portion 6E of the outer layer which is the hydrophobic nonwoven fabric is disposed on the skin-facing surface side of the hydrophilic region 4T so as to be easily sweat-absorbed through the folded portion 6E of the outer layer, and the hydrophilic region 4T having absorbed sweat is not in direct contact with the skin of the wearer, and the body fluid is hardly returned from the hydrophilic region 4T to the skin, so that the skin is less likely to swell, and skin problems such as rash can be expected to be reduced. In the diaper 1 shown in fig. 5, the inner sheet 5, the folded-back portion 5E of the inner layer, the outer sheet 6, and the folded-back portion 6E of the outer layer are provided as the nonwoven fabric constituting the back-side waist panel FB, but a form without the folded-back portion 6E of the outer layer may be adopted. That is, the nonwoven fabric constituting the back-side waist panel FB may be formed to have only the inner sheet 5, the folded-back portion 5E of the inner layer, and the outer sheet 6.

In the diaper 1, as shown in fig. 3, the nonwoven fabric constituting the back-side waist panel FB has the inner sheet 5, the outer sheet 6, and the folded-back portion 6E of the outer sheet, but in the diaper 1 shown in fig. 6, a mode is adopted in which the folded-back portion 6E of the outer sheet is not provided, and only the inner sheet 5 and the outer sheet 6 are provided. In the diaper 1 shown in fig. 6, a nonwoven fabric on the skin side of the wearer with respect to the elastic body 71 corresponds to the inner sheet 5, and a skin-side nonwoven fabric made of hydrophobic fibers corresponds to the inner sheet 5. Specifically, in the diaper 1 shown in fig. 6, the hydrophilic region 4T is formed in the inner sheet 5 which is a skin-side nonwoven fabric, and the outer end 4TB1 of the outer end portion on the back-side region B side in the longitudinal direction X in the hydrophilic region 4T is disposed closer to the crotch region C than the outer end 5B1 of the outer end portion 5B on the back-side region B side of the inner sheet 5. Further, the inner end edge 4TC1 of the inner end portion on the crotch region C side in the longitudinal direction X in the hydrophilic region 4T is arranged at a position closer to the outer end edge 1B side in the longitudinal direction X of the back-side region B than the outer end edge 23B1 on the back-side region B side in the longitudinal direction X in the absorbent body 23. According to the diaper 1 shown in fig. 6, the same effect as that of the diaper 1 shown in fig. 3 can be obtained, and in particular, the hydrophilic region 4T is formed in the inner sheet 5, so that the stretchable region ST of the back-side waist panel FB is made thinner with fewer members, is more flexible and highly breathable, and can rapidly evaporate the absorbed sweat.

In the diaper 1, as shown in fig. 3, the elastic body 71 is an elastic body having a linear shape (including a belt shape) including one linear elastic member 711, but in the diaper 1 shown in fig. 7, the elastic body 71 is composed of one linear elastic member 711 and an elastic fiber layer-shaped elastic member 714 having a film shape or an elastic fiber layer shape other than the linear elastic member 711. In the diaper 1, as shown in fig. 3, the nonwoven fabric constituting the back-side waist panel FB has the inner sheet 5, the outer sheet 6, and the folded-back portion 6E of the outer layer, but in the diaper 1 shown in fig. 7, a mode is adopted in which the inner sheet 5 is not provided and only the outer sheet 6 and the folded-back portion 6E of the outer layer are provided. In the diaper 1 shown in fig. 7, the nonwoven fabric on the skin side of the wearer with respect to the elastic body 71 corresponds to the folded portion 6E of the outer layer, and the skin side nonwoven fabric made of hydrophobic fibers corresponds to the folded portion 6E of the outer layer. Specifically, in the diaper 1 shown in fig. 7, the hydrophilic region 4T is formed in the folded-back portion 6E which is the outer layer of the skin-side nonwoven fabric, and the outer end 4TB1 of the outer end portion of the hydrophilic region 4T on the back-side region B side in the longitudinal direction X is disposed closer to the crotch region C side than the outer end 1B of the back-side region B in the longitudinal direction X. Further, the inner end edge 4TC1 of the inner end portion on the crotch region C side in the longitudinal direction X in the hydrophilic region 4T is disposed at a position closer to the outer end edge 1B side in the longitudinal direction X of the back region B than the inner end edge 6EC1 of the inner end portion on the crotch region C side in the longitudinal direction X in the folded back portion 6E of the outer layer, and is further disposed at a position closer to the outer end edge 1B side in the longitudinal direction X of the back region B than the outer end edge 23B1 on the back region B side in the longitudinal direction X in the absorbent body 23.

In the diaper 1 shown in fig. 7, the single linear elastic member 711 is disposed at the outer end portion on the back-side region B side in the longitudinal direction X in the skin-side nonwoven fabric (folded back portion 6E of the outer layer) where the hydrophilic region 4T is formed, in other words, at a position between the outer end 1B in the longitudinal direction X of the back-side region B of the diaper 1 and the outer end 4TB1 on the back-side region B side in the longitudinal direction (X direction) of the hydrophilic region 4T. The diaper 1 shown in fig. 7 has the same effect as the diaper 1 shown in fig. 3, and the stretch region ST of the back-side waist panel FB has a small thickness with few wrinkles, so that it has low warmth retention property, is cool, and can be more easily fitted to the body.

The absorbent article of the present invention is not limited to the diaper 1 of fig. 3 to 7, and can be modified as appropriate. The components of the diaper 1 shown in fig. 3 to 7 can be combined and implemented as appropriate within a range not to impair the gist of the present invention.

In the disposable diaper 1, as shown in fig. 2, the hydrophilic region 4T formed by applying the hydrophilizing agent to the skin-side nonwoven fabric (inner sheet 5) constituting the stretchable region ST is disposed only in the back-side waist panel FB, but the hydrophilic region 4T may be disposed in the abdomen-side waist panel FA.

Further, in the disposable diaper 1, as shown in fig. 2, the exterior body 3 has a continuous shape such as an hourglass shape throughout the abdomen-side region a, the crotch region C, and the back-side region B, but may be a divided type disposable diaper in which the exterior body 3 is divided into the abdomen-side exterior body, the back-side exterior body, and the crotch-side exterior body to form separate members.

Further, the disposable diaper 1 is a pants-type disposable diaper having the outer package 3 as shown in fig. 1, but may be an open-type disposable diaper.

The above embodiment further discloses a disposable diaper as follows.

<1>

A disposable diaper comprising an abdomen-side region disposed on the abdomen-side of a wearer, a back-side region disposed on the back-side of the wearer, and a crotch region disposed therebetween, and having a longitudinal direction extending from the abdomen-side region to the back-side region and a transverse direction perpendicular to the longitudinal direction, wherein an absorbent body is provided across the abdomen-side region and the back-side region, and the waist-side waist flap and the back-side waist flap are provided so as to extend in the transverse direction and to be positioned outside the front and rear end portions of the absorbent body in the longitudinal direction, respectively,

the disposable diaper is characterized in that,

an elastic region formed by an elastic body arranged in a stretched state in the lateral direction is formed in the back-side waist panel,

in the stretchable region, the back-side waist panel has a skin-side nonwoven fabric made of hydrophobic fibers on a side closer to the skin of the wearer than the elastic body in the nonwoven fabric constituting the back-side waist panel,

the skin-side nonwoven fabric has a hydrophilic region extending in the transverse direction at a position spaced apart from the crotch region side from the position of the outer edge of the back-side region side in the longitudinal direction of the skin-side nonwoven fabric,

the elastic body constituting the stretchable region has at least one elastic member in the form of a thread disposed at a position between an outer edge in the longitudinal direction of the back region and an outer edge on the side of the back region in the longitudinal direction of the hydrophilic region,

in the stretchable region of the back-side waist panel, an elastic body non-existing region is formed between an inner end edge of the linear elastic member closest to the hydrophilic region side of the at least one linear elastic member on the hydrophilic region side and an outer end edge of the hydrophilic region side in the longitudinal direction of the hydrophilic region on the back-side region side.

<2>

The disposable diaper according to the above <1>, wherein the skin-side nonwoven fabric is disposed at a corresponding portion in a region sandwiched between the outer edge of the back-side region side in the longitudinal direction of the hydrophilic region and the outer edge of the back-side region in the longitudinal direction of the absorbent body.

<3>

The disposable diaper according to <1> or <2> above, wherein the elastic body constituting the stretchable region includes, in addition to the one linear elastic member, another linear elastic member adjacent to the one linear elastic member, and the one linear elastic member and the another linear elastic member are disposed at corresponding portions in a region sandwiched between a position of an outer end edge of the skin-side nonwoven fabric on the back-side region side in the longitudinal direction and an outer end edge of the hydrophilic region on the back-side region side in the longitudinal direction.

<4>

The disposable diaper according to any one of <1> to <3>, wherein the skin-side nonwoven fabric is disposed at a corresponding portion in a region sandwiched between an outer edge of the back-side region side in the longitudinal direction of the absorbent body and an outer edge of the back-side region in the longitudinal direction of the absorbent body, at an inner end edge of the hydrophilic region on the crotch region side in the longitudinal direction.

<5>

The disposable diaper according to the above <4>, wherein the elastic body constituting the stretchable region is composed of a plurality of thread-like elastic members,

the other linear elastic members than the one linear elastic member are disposed at corresponding portions in a region sandwiched between an inner end edge of the skin-side nonwoven fabric on the crotch region side in the longitudinal direction of the hydrophilic region and an outer end edge of the absorbent body on the back region side in the longitudinal direction of the absorbent body.

<6>

The disposable diaper according to any one of the above <1> to <5>, wherein the nonwoven fabric constituting the back-side waist panel has: an outer sheet forming a non-skin-facing surface of the disposable diaper; and an inner layer sheet disposed to face the skin-facing surface of the outer layer sheet, and further having a folded-back portion of the outer layer folded back toward the skin-facing surface side from an outer end edge in the longitudinal direction of the back-side region in the outer layer sheet, or a folded-back portion of the inner layer folded back toward the skin-facing surface side from an outer end edge in the longitudinal direction of the back-side region in the inner layer sheet,

the hydrophilic region is formed in a folded portion of the outer layer or a folded portion of the inner layer, which is the skin-side nonwoven fabric,

the inner end edge of the hydrophilic region on the crotch region side in the longitudinal direction is disposed closer to the outer end edge of the back region in the longitudinal direction than the inner end edge of the hydrophilic region on the crotch region side in the longitudinal direction in the folded-back portion of the outer layer or the folded-back portion of the inner layer.

<7>

The disposable diaper according to any one of <1> to <6>, wherein a hydrophobic nonwoven fabric made of hydrophobic fibers is disposed on a skin-facing surface side of the skin-side nonwoven fabric having the hydrophilic region.

<8>

The disposable diaper according to the above <7>, wherein the skin-side nonwoven fabric and the hydrophobic nonwoven fabric are fixed to each other at a heat-fused portion disposed in the hydrophilic region of the skin-side nonwoven fabric.

<9>

The disposable diaper according to any one of <1> to <8>, wherein the hydrophilic region is not a region formed of a separate nonwoven fabric from the skin-side nonwoven fabric, but a region formed by applying a hydrophilizing agent to a part of the skin-side nonwoven fabric made of hydrophobic fibers.

<10>

The disposable diaper according to any one of the above <1> to <9>, wherein the hydrophilic region is disposed over an entire length of the back-side waist panel in the transverse direction.

<11>

The disposable diaper according to any one of <1> to <10> above, wherein a length (L1) of the hydrophilic region in the longitudinal direction is 10mm or more, preferably 20mm or more, and 100mm or less, preferably 90mm or less.

<12>

The disposable diaper according to any one of <1> to <11>, wherein the linear elastic member is disposed at an outer end portion on the back-side region side in the longitudinal direction of the skin-side nonwoven fabric in which the hydrophilic region is formed.

<13>

The disposable diaper according to any one of the above <1> to <12>, wherein the elastic body free region is formed over an entire length of the back-side waist panel in the transverse direction.

<14>

The disposable diaper according to any one of <1> to <13> above, wherein a length (L2) of the elastic-body-free region in a longitudinal direction is 3mm or more, preferably 4mm or more, and 15mm or less, preferably 13mm or less.

<15>

The disposable diaper according to any one of <1> to <14> above, wherein the hydrophilic region and the elastic body disposed at a position corresponding to the hydrophilic region are disposed in such a manner that: the other linear elastic members adjacent to the one linear elastic member in the longitudinal direction are disposed at positions spaced apart from the outer end edge of the hydrophilic region on the back region side in the longitudinal direction on the crotch region side.

<16>

The disposable diaper according to any one of <1> to <15> above, wherein an inner end edge of the hydrophilic region on the crotch region side in the longitudinal direction is disposed at a corresponding portion in a region sandwiched between an outer end edge of the back region side in the longitudinal direction in an absorbent body having the absorber and an outer end edge of the disposable diaper in the longitudinal direction in the back region.

<17>

The disposable diaper according to the above <5>, wherein the folded-back portion of the skin-side nonwoven fabric and the outer layer made of a hydrophobic nonwoven fabric are fixed to each other at a heat-fused portion disposed in the hydrophilic region of the skin-side nonwoven fabric.

<18>

The disposable diaper according to the above <5>, wherein the skin-side nonwoven fabric made of hydrophobic fibers is a folded portion of the outer sheet.

<19>

The disposable diaper according to the above <5>, wherein the hydrophilic region is formed in a folded back portion of the outer layer which is the skin-side nonwoven fabric,

the inner end edge of the inner end portion of the hydrophilic region on the crotch region side in the longitudinal direction is disposed closer to the outer end portion of the back region in the longitudinal direction than the inner end edge of the inner end portion of the outer layer on the crotch region side in the longitudinal direction in the folded-back portion.

<20>

The disposable diaper according to the above <5>, wherein the hydrophilic region is formed in a folded portion of the inner layer which is the skin-side nonwoven fabric,

the inner end edge of the inner end portion of the hydrophilic region on the crotch region side in the longitudinal direction is located closer to the outer end portion of the back region in the longitudinal direction than the inner end edge of the inner end portion of the inner layer on the crotch region side in the longitudinal direction in the folded portion.

<21>

The disposable diaper according to any one of <1> to <20> above, wherein the nonwoven fabric constituting the back-side waist panel and the abdomen-side waist panel has an outer sheet forming the non-skin-facing surface of the disposable diaper and an inner sheet disposed to face the skin-facing surface of the outer sheet,

the back-side waist panel and the abdomen-side waist panel are formed such that the inner layer sheet and the outer layer sheet are joined and fixed at a plurality of joining portions formed by thermal fusion bonding arranged in a scattered manner,

the telescopic region comprises a waist telescopic part and a waist lower part telescopic part,

in a region from the waist stretchable panel to the lower waistline stretchable panel in each of the abdominal region and the back region, the inner layer sheet and the outer layer sheet are intermittently arranged in a row along the longitudinal direction, and a plurality of rows of joined portions formed by the plurality of joined portions are arranged at intervals in the transverse direction.

<22>

The disposable diaper according to the above <21>, wherein a plurality of the elastic bodies are disposed between the inner layer sheet and the outer layer sheet fixed to the joint portion in an elongated state in a transverse direction and intermittently disposed in a longitudinal direction.

<23>

The disposable diaper according to the item <21> or <22>, wherein the plurality of elastic bodies are arranged in a state of being stretched in the lateral direction through gaps between the joint portions of the plurality of joint portion rows in a region from the waist stretchable portion to the lower waistline stretchable portion in each of the abdominal region and the back region.

<24>

The disposable diaper according to any one of <21> to <23> above, having a folded back portion of the outer layer folded back from an outer end edge in a longitudinal direction of the back-side region in the outer layer sheet toward a skin-facing surface side,

the outer layer sheet between the laterally adjacent joint line rows is deformed so as to bulge outward, and the folded-back portion of the outer layer and the inner layer sheet are deformed so as to bulge inward, thereby forming a wrinkle portion.

<25>

The disposable diaper according to any one of <1> to <24> above, which has an absorbent body and an exterior body disposed on a non-skin-facing surface side of the absorbent body and fixing the absorbent body,

the outer body has the abdomen-side waist panel and the back-side waist panel,

the outer package has an outer sheet forming a non-skin-facing surface of the disposable diaper and an inner sheet disposed to face a skin-facing surface of the outer sheet,

the disposable diaper has a pair of outer fastening regions formed by joining the inner layer sheet and the outer layer sheet to each other with an elastic fastening adhesive interposed therebetween, at both side edges of the front-side region of the outer covering and at both side edges of the back-side region of the outer covering.

<26>

The disposable diaper according to the above <25>, wherein the elastic body is fixed between the inner layer sheet and the outer layer sheet at a pair of the outer fixing regions, respectively, and is not fixed to either the inner layer sheet or the outer layer sheet between a pair of the outer fixing regions.

<27>

The disposable diaper according to the above <25> or <26>, wherein the disposable diaper has a pair of main body side fixing regions in which the inner layer sheet and the outer layer sheet are joined together via an adhesive for elastomer fixation in the vicinity of both side portions of the absorbent main body in the longitudinal direction.

<28>

The disposable diaper according to any one of <25> to <27>, wherein the elastic body is fixed between the inner layer sheet and the outer layer sheet in the outer fixing region and the main body side fixing region, respectively, and is not fixed to either of the inner layer sheet and the outer layer sheet between the outer fixing region and the main body side fixing region.

<29>

The disposable diaper according to any one of <1> to <28>, wherein the hydrophilic region is formed in the back-side waist panel and the abdomen-side waist panel.

<30>

The disposable diaper according to any one of <1> to <29> above, wherein the nonwoven fabric constituting the back-side waist panel has an outer sheet forming the non-skin-facing surface of the disposable diaper and an inner sheet disposed to face the skin-facing surface of the outer sheet,

the hydrophilic region is formed in the inner layer sheet which is the skin-side nonwoven fabric,

an outer end edge of the outer end portion of the hydrophilic region on the back-side region side in the longitudinal direction is disposed closer to the crotch region side than an outer end edge of the outer end portion of the inner sheet on the back-side region side.

<31>

The disposable diaper according to any one of <1> to <29>, wherein the nonwoven fabric constituting the back-side waist panel has an outer sheet forming a non-skin-facing surface of the disposable diaper, an inner sheet disposed to face a skin-facing surface of the outer sheet, and a folded-back portion of the outer sheet folded back from an outer edge in a longitudinal direction of the back-side region in the outer sheet to the skin-facing surface side, or a folded-back portion of the inner sheet folded back from an outer edge in the longitudinal direction of the back-side region in the inner sheet to the skin-facing surface side,

the hydrophilic region is formed in a folded portion of the outer layer of the skin-side nonwoven fabric,

the outer edge of the outer end portion of the hydrophilic region on the back-side region side in the longitudinal direction is located closer to the crotch region side than the outer edge of the outer end portion of the hydrophilic region on the back-side region side in the longitudinal direction.

Industrial applicability of the invention

According to the present invention, the skin of the wearer is less likely to be irritated when the wearer wears the skin, and skin problems such as redness, eczema, miliaria, and rash can be expected to be reduced.

Claims

1. A disposable diaper comprising an abdomen-side region disposed on the abdomen-side of a wearer, a back-side region disposed on the back-side of the wearer, and a crotch region located therebetween, and having a longitudinal direction extending from the abdomen-side region to the back-side region and a transverse direction perpendicular to the longitudinal direction, wherein the disposable diaper has an absorber provided across the abdomen-side region and the back-side region, and has an abdomen-side waist flap and a back-side waist flap located outside and extending in the transverse direction from each of front and rear end portions of the absorber in the longitudinal direction, the disposable diaper characterized in that:

the disposable diaper comprises an absorbent main body and an outer cover arranged on a non-skin-facing surface side of the absorbent main body and fixing the absorbent main body, wherein a separate sweat absorbing sheet for absorbing sweat is not attached to a waist circumference of the outer cover,

an elastic region formed by an elastic body arranged in an extended state in the transverse direction is formed in the back-side waist panel,

in the stretchable region, the back-side waist panel has a skin-side nonwoven fabric made of hydrophobic fibers on the side closer to the skin of the wearer than the elastic body in the nonwoven fabric constituting the back-side waist panel,

the skin-side nonwoven fabric has a hydrophilic region extending in the transverse direction at a position spaced apart from the position of the outer edge of the back-side region in the longitudinal direction of the skin-side nonwoven fabric on the crotch region side,

the elastic body constituting the stretchable region has at least one elastic member in the form of a thread disposed at a position between an outer edge in the longitudinal direction of the back region and an outer edge on the back region side in the longitudinal direction of the hydrophilic region,

in the stretchable region of the back-side waist panel, an elastic body non-existing region is formed between an inner end edge on the hydrophilic region side of a linear elastic member closest to the hydrophilic region side of the at least one linear elastic member and an outer end edge on the back-side region side in the longitudinal direction of the hydrophilic region.

2. The disposable diaper of claim 1, wherein:

the skin-side nonwoven fabric is disposed at a corresponding portion in a region sandwiched between the outer edge of the back-side region side in the longitudinal direction of the hydrophilic region and the outer edge of the back-side region side in the longitudinal direction of the absorbent body.

3. A disposable diaper according to claim 1 or 2, characterized in that:

the elastic body constituting the stretchable region is composed of a plurality of elastic members in the form of threads, and in addition to the one elastic member in the form of a thread, the elastic body further includes another elastic member in the form of a thread adjacent to the one elastic member in the form of a thread, and the one elastic member in the form of a thread and the another elastic member are disposed in corresponding portions in a region sandwiched between a position of an outer edge of the skin-side nonwoven fabric on the back-side region side in the longitudinal direction and an outer edge of the hydrophilic region on the back-side region side in the longitudinal direction.

4. A disposable diaper according to any one of claims 1 to 3, characterized in that:

the skin-side nonwoven fabric is disposed at a corresponding portion in a region sandwiched between the outer edge of the back-side region in the longitudinal direction of the absorbent body and the outer edge of the back-side region in the longitudinal direction of the absorbent body, at the inner edge of the hydrophilic region on the crotch region side in the longitudinal direction.

5. The disposable diaper of claim 4, wherein:

the elastic body constituting the expansion/contraction region is composed of a plurality of thread-like elastic members,

6. A disposable diaper according to any one of claims 1 to 5, characterized in that:

the nonwoven fabric constituting the back-side waist panel has: an outer sheet forming a non-skin-facing surface of the disposable diaper; and an inner layer sheet disposed to face the skin-facing surface of the outer layer sheet, and further having a folded-back portion of the outer layer folded back toward the skin-facing surface side from an outer end edge in the longitudinal direction of the back-side region in the outer layer sheet, or a folded-back portion of the inner layer folded back toward the skin-facing surface side from an outer end edge in the longitudinal direction of the back-side region in the inner layer sheet,

the hydrophilic region is formed in a folded back portion of the outer layer or a folded back portion of the inner layer, which is the skin-side nonwoven fabric,

the inner end edge of the hydrophilic region on the crotch region side in the longitudinal direction is disposed closer to the outer end edge of the back region in the longitudinal direction than the inner end edge of the outer layer or the inner layer on the crotch region side in the longitudinal direction in the folded-back portion.

7. A disposable diaper according to any one of claims 1 to 6, characterized in that:

a hydrophobic nonwoven fabric made of hydrophobic fibers is disposed on the skin-facing surface side of the skin-side nonwoven fabric having the hydrophilic region.

8. The disposable diaper of claim 7, wherein:

the skin-side nonwoven fabric and the hydrophobic nonwoven fabric are fixed to each other at a heat-sealing portion disposed in the hydrophilic region of the skin-side nonwoven fabric.

9. The disposable diaper according to any one of claims 1 to 8, characterized in that:

the hydrophilic region is not a region formed of a separate nonwoven fabric that is separate from the skin-side nonwoven fabric, but a region formed by applying a hydrophilizing agent to a part of the skin-side nonwoven fabric that is formed of hydrophobic fibers.

10. The disposable diaper according to any one of claims 1 to 9, characterized in that:

the hydrophilic region is disposed over the entire length of the back-side waist panel in the lateral direction.

11. The disposable diaper according to any one of claims 1 to 10, characterized in that:

the length L1 in the longitudinal direction of the hydrophilic region is 10mm to 100 mm.

12. A disposable diaper according to any of claims 1 to 11, characterized in that:

the linear elastic member is disposed at an outer end portion of the skin-side nonwoven fabric on the back-side region side in the longitudinal direction, the hydrophilic region being formed in the skin-side nonwoven fabric.

13. The disposable diaper according to any one of claims 1 to 12, characterized in that:

the elastic-free region is formed over the entire length of the back-side waist panel in the lateral direction.

14. The disposable diaper according to any one of claims 1 to 13, characterized in that:

the longitudinal length L2 of the elastic-body-free region is 3mm to 15 mm.

15. The disposable diaper according to any one of claims 1 to 14, characterized in that:

the arrangement relationship between the hydrophilic region and the elastic body arranged at the position corresponding to the hydrophilic region is as follows: the other linear elastic members adjacent to the one linear elastic member in the longitudinal direction are disposed at positions spaced apart from the outer end edge of the hydrophilic region on the back region side in the longitudinal direction on the crotch region side.

16. The disposable diaper according to any one of claims 1 to 15, characterized in that:

the inner end edge on the crotch region side in the longitudinal direction of the hydrophilic region is disposed at a corresponding portion in a region sandwiched by the outer end edge on the back region side in the longitudinal direction in the absorbent body having the absorbent body and the outer end edge on the back region side in the longitudinal direction in the disposable diaper.

17. The disposable diaper of claim 6, wherein:

the skin-side nonwoven fabric and the folded-back portion of the outer layer made of a hydrophobic nonwoven fabric are fixed to each other at a heat-welded portion disposed in the hydrophilic region of the skin-side nonwoven fabric.

18. The disposable diaper of claim 6, wherein:

the skin-side nonwoven fabric made of hydrophobic fibers is a folded-back portion of the outer sheet.

19. The disposable diaper of claim 6, wherein:

the hydrophilic region is formed in a folded back portion of the outer layer which is the skin-side nonwoven fabric,

an inner end edge of an inner end portion of the hydrophilic region on the crotch region side in the longitudinal direction is disposed on the outer end portion side in the longitudinal direction of the back region than an inner end edge of an inner end portion of the outer layer on the crotch region side in the longitudinal direction.

20. The disposable diaper of claim 6, wherein:

the hydrophilic region is formed in a folded back portion of the inner layer which is the skin-side nonwoven fabric,

an inner end edge of an inner end portion of the hydrophilic region on the crotch region side in the longitudinal direction is disposed on the outer end portion side in the longitudinal direction of the back region than an inner end edge of an inner end portion of the inner layer on the crotch region side in the longitudinal direction in the folded-back portion.

21. The disposable diaper according to any one of claims 1 to 20, characterized in that:

the nonwoven fabric constituting the back-side waist panel and the abdomen-side waist panel has an outer sheet forming the non-skin-facing surface of the disposable diaper and an inner sheet disposed to face the skin-facing surface of the outer sheet,

the back-side waist panel and the abdominal-side waist panel are formed such that the inner layer sheet and the outer layer sheet are joined and fixed at a plurality of joining portions formed by thermal welding arranged in a scattered manner,

the telescopic area is provided with a waist telescopic part and a waist lower part telescopic part,

in a region from the waist stretchable panel to the lower waistline stretchable panel in each of the abdominal region and the back region, the inner layer sheet and the outer layer sheet are intermittently arranged in a row in the longitudinal direction, and a plurality of rows of joint portions formed by the plurality of joint portions are arranged in the transverse direction at intervals.

22. The disposable diaper of claim 21, wherein:

the elastic body is provided between the inner layer sheet and the outer layer sheet fixed to the joint portion, and the elastic body is arranged in a state of being elongated in the transverse direction and intermittently arranged in the longitudinal direction.

23. A disposable diaper according to claim 21 or 22, characterized in that:

in a region from the waist stretchable portion to the lower waistline stretchable portion in each of the abdominal region and the back region, the plurality of elastic bodies are arranged in a state of being stretched in a lateral direction by a gap between the joint portions in each of the plurality of joint portion rows.

24. A disposable diaper according to any of claims 21 to 23, characterized in that:

a folded-back portion having an outer layer folded back from an outer end edge in a longitudinal direction of the back-side region in the outer sheet toward a skin-facing surface side,

25. The disposable diaper according to any one of claims 1 to 24, characterized in that:

the disposable diaper comprises an absorbent main body and an exterior body arranged on the non-skin-facing surface side of the absorbent main body and fixing the absorbent main body,

the outer body has the abdominal-side waist flap and the back-side waist flap,

the disposable diaper has a pair of outer fastening regions formed by joining the inner layer sheet and the outer layer sheet via an adhesive for elastomer fastening, at both side edges of the front side region of the outer covering and at both side edges of the back side region of the outer covering.

26. The disposable diaper of claim 25, wherein:

the elastic body is fixed between the inner layer sheet and the outer layer sheet in the pair of outer fixing regions, respectively, and is not fixed to either the inner layer sheet or the outer layer sheet in the pair of outer fixing regions.

27. A disposable diaper according to claim 25 or 26, characterized in that:

the disposable diaper has a pair of main body side fixing regions in the vicinity of both side portions in the longitudinal direction of the absorbent main body, the main body side fixing regions being formed by joining the inner layer sheet and the outer layer sheet with an elastomer fixing adhesive interposed therebetween.

28. The disposable diaper of claim 27 wherein:

the elastic body is fixed between the inner layer sheet and the outer layer sheet in the outer fixing region and the main body fixing region, respectively, and is not fixed to either the inner layer sheet or the outer layer sheet between the outer fixing region and the main body fixing region.

29. The disposable diaper according to any one of claims 1 to 28, wherein:

the hydrophilic region is formed in the back-side waist panel and the abdomen-side waist panel.

30. The disposable diaper according to any one of claims 1 to 29, wherein:

the nonwoven fabric constituting the back-side waist panel has an outer sheet forming the non-skin-facing surface of the disposable diaper and an inner sheet disposed to face the skin-facing surface of the outer sheet,

the hydrophilic region is formed in the inner sheet which is the skin-side nonwoven fabric,

the outer edge of the outer end portion of the hydrophilic region on the back-side region side in the longitudinal direction is arranged closer to the crotch region side than the outer edge of the outer end portion of the inner sheet on the back-side region side.

31. The disposable diaper according to any one of claims 1 to 29, wherein:

the nonwoven fabric constituting the back-side waist panel has an outer sheet forming the non-skin-facing surface of the disposable diaper, an inner sheet disposed to face the skin-facing surface of the outer sheet, a folded-back portion of the outer sheet folded back toward the skin-facing surface from an outer end edge in the longitudinal direction of the back-side region in the outer sheet, or a folded-back portion of the inner sheet folded back toward the skin-facing surface from an outer end edge in the longitudinal direction of the back-side region in the inner sheet,

the outer edge of the outer end of the hydrophilic region on the back-side region side in the longitudinal direction is arranged closer to the crotch region side than the outer edge of the outer end of the hydrophilic region on the back-side region side in the longitudinal direction.