CN110035730B

CN110035730B - Disposable diaper having a disposable diaper

Info

Publication number: CN110035730B
Application number: CN201780074997.7A
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: 2017-12-20
Publication date: 2021-11-02
Anticipated expiration: 2037-12-20
Also published as: WO2018117194A1; RU2019121949A3; JP2018102429A; RU2748037C2; CN110035730A; JP6744206B2; RU2019121949A

Abstract

A disposable diaper (1) has a stretchable region (ST) formed by an elastic member (71) in a back-side waist panel (FB). The back-side waist panel (FB) has an inner sheet (5) of nonwoven fabric in the stretch region (ST), and the inner sheet (5) includes a hydrophilic region (4T) formed by applying a hydrophilic agent. The inner sheet (5) is folded back at a folded-back portion (RP) located at the outer end (1B) of the back region (B), and one folded-back portion (5E) is disposed closer to the skin of the wearer than the elastic member (71). The hydrophilic region (4T) spans the fold back portion (RP) so that the side closer to the skin of the wearer is longer in the longitudinal direction.

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).

Further, 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 waistline 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 including 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 including an absorber provided across the abdomen-side region and the back-side region, and an abdomen-side waist flap and a back-side waist flap located outside respective longitudinal front and rear end portions of the absorber and extending in the transverse direction. The back-side waist panel forms an extensible region formed by an elastic member disposed in an extended state in the lateral direction. The back-side waist panel has a nonwoven fabric including a hydrophilic region formed of hydrophilic fibers in the stretchable region. The nonwoven fabric including the hydrophilic region is folded back at a folded-back portion located at an outer end in the longitudinal direction of the back-side region, and at least one folded-back portion is disposed closer to the skin of the wearer than the elastic member. The hydrophilic region extends across the folded portion so that the longitudinal length thereof is longer on the side closer to the skin of the wearer.

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 expanded 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 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. 8 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

The present inventors have found that when a sweat-absorbing sheet for absorbing sweat is disposed at an end portion in the longitudinal direction of an outer cover of a pants-type disposable diaper, the sweat absorbed by the sweat-absorbing sheet is easily evaporated from the end portion of the outer cover, and stuffiness can be suppressed when the pants-type disposable diaper is worn.

However, patent documents 1 and 2 do not describe a method of actively transferring absorbed sweat by using a sweat absorbing sheet at an end portion in the longitudinal direction of an outer package of a pants-type disposable diaper.

The present invention therefore relates to a disposable diaper which is capable of eliminating the drawbacks of the prior art described above.

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

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

rear end portions

23A, 23B of the absorbent body 23 in the longitudinal direction X. Here, the abdomen-side region a refers to a region disposed on the abdomen side of the wearer when the disposable diaper is worn, and the back-side region B refers to 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 from the outer edge 23A1 of the front end 23A on the abdomen-side region a side in the longitudinal direction X of the absorbent body 23 to the outside in the longitudinal direction X and a region extending in the lateral direction Y from the front end 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 outer 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 region 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. Preferably, the outer package 3 of the diaper 1 is 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 when viewed in plan as shown in fig. 2.

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 seals S as shown in fig. 2, and the elastic members of the respective portions are extended to expand the diaper 1 in the developed state to a designed size (the same size as that when developed in a flat state in a state in which the influence of the elastic members is completely eliminated).

In the present specification, the "skin-facing surface" refers to a surface of the diaper 1 or a component thereof which faces the skin of the wearer when worn, that is, a surface which is relatively close to the skin of the wearer, and the "non-skin-facing surface" refers to a surface of the diaper 1 or a component thereof which faces the opposite side (the clothing side) to the skin of the wearer when worn, that is, a surface which is relatively far from the skin of the wearer. In the diaper 1, the longitudinal direction (X direction) is a direction from the abdominal region a to the back 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 state in which it is developed and extended in a plane.

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 positions of 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 positions of 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, the

leakage preventing cuffs

24, 24 are provided on both sides of the absorbent main body 2 in the longitudinal direction (X direction), and the

leakage preventing cuffs

24, 24 have elastic members 25 arranged in a state of being elongated in the longitudinal direction (X direction). Specifically, the leakage preventing cuffs 24 are made of a liquid-impermeable, water-repellent, and air-permeable material, and the leakage preventing cuff-forming elastic member 25 is disposed in the vicinity of the free end of each leakage preventing cuff 24 in a state of being 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 members 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.

As a result of forming the stretchable region ST by the elastic member 71 disposed in an elongated state in the transverse direction (Y direction) in the back-side waist panel FB, in the diaper 1, as shown in fig. 2 and 3, the stretchable region ST formed by the elastic member 71 disposed in an elongated state in the transverse direction (Y direction) is formed in each of the abdomen-side waist panel FA and the back-side waist panel FB which are located outward from the front and

rear end portions

23A, 23B of the absorbent body 23 in the longitudinal direction X and extend in the transverse direction Y. 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.

In the diaper 1, as shown in fig. 2 and 3, the inner-layer sheet 5 is folded back only at the outer end portion 1B in the longitudinal direction X of the back-side region B of the diaper 1, in other words, at the folded-back portion RP located at the peripheral edge portion of the waist opening WH in the back-side region B, and at least one folded-back portion 5E is disposed closer to the skin of the wearer than the elastic member 71 disposed in an extended state in the lateral direction (Y direction). In the diaper 1, one folded-back portion 5E is overlapped with the skin-facing surface of the remaining inner-layer sheet 5 via the folded-back portion RP. The inner sheet 5 is formed of a hydrophobic nonwoven fabric made of hydrophobic fibers in the diaper 1. In this way, in the diaper 1, the hydrophobic nonwoven fabric made of hydrophobic fibers constituting the back-side waist panel FB corresponds to the inner sheet 5.

In the diaper 1, as shown in fig. 2 and 3, the outer sheet 6 has an outer folded-back portion 6E in the abdomen-side region a and the back-side region B, the outer folded-back portion 6E extends from the outer edge 5B1 (the apex of a folded-back portion RP described later) in the longitudinal direction X of the inner sheet 5 and is folded back to the skin-facing surface side of the inner sheet 5 along the peripheral edge portion of the waist opening WH, and the outer folded-back portion 6E covers 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 outer layer folded-back portion 6E and the inner layer sheet 5 (including one folded-back portion 5E) are joined to each other at a predetermined position by joining means such as an adhesive, heat sealing, high-frequency sealing, or ultrasonic sealing.

As described above, in the diaper 1, as shown in fig. 2, the outer package 3 has the outer sheet 6 forming the non-skin-facing surface side of the outer surface of the diaper 1, the outer folded-back portion 6E closest to the skin-facing surface side, and the inner sheet 5 and the inner folded-back portion 5E disposed between the outer sheet 6 and the outer folded-back portion 6E. In the diaper 1, the outer sheet 6 and the inner sheet 5 except the inner folded-back portion 5E and the outer folded-back portion 6E 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 inner-layer folded-back portion 5E formed by the one folded-back portion 5E of the inner-layer sheet 5 is formed in a rectangular shape elongated in the lateral direction (Y direction) in the back-side region B. The outer-layer folded-back portions 6E formed by the folded-back portions 6E of the outer sheet 6 are formed in a laterally (Y-direction) long rectangular shape in the ventral region a and the dorsal region B, respectively. The outer-layer folded-back portion 6E, the inner-layer sheet 5, and the outer-layer sheet 6 may be separate sheets, respectively, but in the diaper 1, the outer-layer folded-back portion 6E is formed by a folded-back portion of the outer-layer sheet 6. In this way, in the diaper 1, the outer-layer folded-back portion 6E, the inner-layer folded-back portion 5E, the inner-layer sheet 5, and the outer-layer sheet 6 are arranged in this order from the side closer to the skin of the wearer to the side farther from the back side waist panel FB. In the diaper 1, the outer-layer folded-back portion 6E, the inner-layer sheet 5, and the outer-layer sheet 6 are disposed in this order from the side closer to the skin of the wearer to the side farther from the abdomen-side waist panel FA.

In the diaper 1, as shown in fig. 2, the outer package 3 has a plurality of linear or belt-like elastic members 71 disposed intermittently in the longitudinal direction (X direction) in a state of being 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 further includes a plurality of linear or belt-like leg elastic members 72 extending between the inner sheet 5 and the outer sheet 6. The diaper 1 includes a plurality of leg elastic members 72, thereby forming leg stretch units G3. The leg stretch portion G3 is formed on the peripheral edge of the leg opening LH as shown in fig. 2.

In the diaper 1, as shown in fig. 2, the waist stretch units G1 are formed in end flaps located further outward in the longitudinal direction X (on the opposite side to the lateral centerline CL2 side) than the outer edges 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 side flap portions between the lower ends of the waist stretch units G1 on the side of the transverse center line 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 integrated.

In the diaper 1, as shown in fig. 2, the outer package 3 has a plurality of joint portions 8 for joining the inner sheet 5 and the outer sheet 6. 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 formed by thermal fusion bonding arranged in a scattered manner. In the diaper 1, in the region from the waist stretch units G1 to the lower waist stretch units G2 in 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 along 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 lateral direction (Y direction).

As shown in fig. 2, the diaper 1 has a plurality of elastic members 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 portions 8. Preferably, in the diaper 1, the plurality of elastic members 71 are arranged in an extended state in the lateral direction (Y direction) 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 through gaps between the joint units 8 in each of the joint unit rows 8L.

As shown in fig. 2, the diaper 1 includes a pair of outer fixing regions 3T1 and 3T1 in which the inner sheet 5 and the outer sheet 6 are joined together via an elastic member fixing adhesive at both side edges 3a1 and 3a1 of the abdominal region a of the outer package 3 and both side edges 3B1 and 3B1 of the back region B of the outer package 3, and a pair of main body fixing regions 3T2 and 3T2 in which the inner sheet 5 and the outer sheet 6 are joined together via an elastic member 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 members 71 are disposed across the pair of outer fastening regions 3T1, 3T1, and these elastic members 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. Specifically, in the waist stretch unit G1 of the diaper 1, a plurality of elastic members 71 are disposed across the pair of outer fastening regions 3T1 and 3T1, and these elastic members 71 are fastened between the hydrophilic short-sized portion 4TS, described later, formed in the inner sheet 5 and the outer sheet 6 in each of the pair of outer fastening regions 3T1 and 3T1, but are not fastened between the pair of outer fastening regions 3T1 and 3T1, described later, including the central region in the lateral direction Y, formed in the inner sheet 5 and either the hydrophilic short-sized portion 4TS, described later, or the outer sheet 6.

In the lower waistline stretch unit G2 of the diaper 1, as shown in fig. 2, a plurality of elastic members 71 are disposed across between the outer fastening region 3T1 and the main body side fastening region 3T2, and these elastic members 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 member 71 is not disposed between the pair of main body side fixing regions 3T2 and 3T2, or the elastic member 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 members 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 member 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 package 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 members 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 sheet and the inner sheet 5 so as to bulge inward. As described above, in the central region in the lateral direction Y, the elastic member 71 is not fixed to the hydrophilic short-sized portion 4TS, which will be described later, formed in the inner sheet 5, and therefore sweat absorbed by the hydrophilic short-sized portion 4TS is easily evaporated by the space formed by being deformed so as to bulge inward.

The back-side waist panel FB has a nonwoven fabric including a hydrophilic region 4T formed of hydrophilic fibers in the stretchable region ST, and in the diaper 1, the back-side waist panel FB has an inner sheet 5 formed of a hydrophobic nonwoven fabric formed of hydrophobic fibers in the stretchable region ST, and as the nonwoven fabric constituting the back-side waist panel FB, the inner sheet 5 includes a hydrophilic region 4T formed of hydrophilic fibers coated with a hydrophilic agent over the entire length in the lateral direction Y. In this way, in the diaper 1, the hydrophilic region 4T is not formed of a nonwoven fabric separate from the hydrophobic nonwoven fabric (inner sheet 5), but is formed by coating a hydrophilic agent on a part of the entire region of the hydrophobic nonwoven fabric (inner sheet 5) composed of hydrophobic fibers. In the back-side waist panel FB of the diaper 1, the hydrophilic region 4T is formed by applying a hydrophilic agent to a part of the inner sheet 5, which is formed of a hydrophobic nonwoven fabric and is close to the skin of the wearer, over the entire length in the transverse direction (Y direction) of the inner sheet 5 constituting the back-side waist panel FB.

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. The hydrophilic region 4T is disposed in the diaper 1 in the stretch region ST of the back-side waist panel FB, i.e., in a region where the waist stretch unit G1 and the lower waist stretch unit G2 are partially united.

As described above, in the diaper 1, the inner sheet 5, which is a nonwoven fabric including the hydrophilic region 4T, is folded back at the outer end 1B in the longitudinal direction X of the back region B of the diaper 1, in other words, at the folded back portion RP located at the peripheral edge of the waist opening WH, and the hydrophilic region 4T is folded back at the folded back portion RP, as shown in fig. 2 and 3, the hydrophilic region 4T of the hydrophobic nonwoven fabric (inner sheet 5) spans the folded back portion RP so as to be long on the side closer to the skin of the wearer in the longitudinal direction (X direction). In the diaper 1, the hydrophilic region 4T of the inner sheet 5 is divided into a hydrophilic long-sized portion 4TL and a hydrophilic short-sized portion 4TS, the hydrophilic long-sized portion 4TL being disposed on the side close to the skin of the wearer and extending long in the longitudinal direction (X direction) from the folded portion RP, and the hydrophilic short-sized portion 4TS being disposed on the side farther from the skin of the wearer than the hydrophilic long-sized portion 4TL and being shorter in the longitudinal direction (X direction) than the hydrophilic long-sized portion 4 TL. In the diaper 1, the hydrophilic long-sized portion 4TL and the hydrophilic short-sized portion 4TS are disposed closer to the skin of the wearer than the elastic member 71. The hydrophilic long-sized portion 4TL is disposed closer to the skin of the wearer than the hydrophilic short-sized portion 4 TS. In the diaper 1, the hydrophilic long-sized portion 4TL and the hydrophilic short-sized portion 4TS are overlapped so as to abut against each other.

As the hydrophilic agent for forming the hydrophilic region 4T, a known hydrophilic 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 grammage of the hydrophilic agent applied to the skin-side nonwoven fabric (e.g., 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, from the viewpoint of absorbing a large amount of sweat on the back side of the wearer when worn, the ratio ((L2/L1) × 100) of the length (L2) in the longitudinal direction (X direction) of the hydrophilic long-sized section 4TL to the length (L1) in the longitudinal direction (X direction) of the inner layer folded back portion 5E is preferably 80% or more, more preferably 90% or more, and the upper limit is 100%. The lengths (L1) and (L2) are lengths in a state where the diaper 1 is unfolded and extended. From the viewpoint of not moving the body fluid absorbed by the absorbent body 23, it is preferable that the hydrophilic long-sized portion 4TL does not reach the inner end portion of the inner layer folded back portion 5E on the crotch region C side, and a hydrophobic region formed of hydrophobic constituent fibers is present at the inner end portion.

The hydrophilic long-sized portion 4TL may be longer in the longitudinal direction X than the hydrophilic short-sized portion 4TS, and may be, for example, the hydrophilic long-sized portion 4TL in the entire region of the inner-layer folded back portion 5E. In the case where the entire region of the inner layer folded-back portion 5E is the hydrophilic long-sized portion 4TL, the inner end portion on the crotch region C side of the inner layer folded-back portion 5E preferably does not extend to a position in contact with the rear end portion 23B of the absorbent body 23 in the longitudinal direction X, from the viewpoint of not moving the body fluid absorbed by the absorbent body 23. That is, the inner end portion of the folded-back inner portion 5E on the crotch region C side and the rear end portion 23B of the absorbent body 23 in the longitudinal direction X are preferably disposed with a space therebetween.

In the diaper 1, from the viewpoint of absorbing a large amount of sweat on the back side of the wearer when worn, the ratio ((L3/L2) × 100) of the length (L3) in the longitudinal direction (X direction) of the hydrophilic short-length section 4TS to the length (L2) in the longitudinal direction (X direction) of the hydrophilic long-length section 4TL is preferably 3% or more, more preferably 5% or more, and preferably 80% or less, more preferably 70% or less, specifically preferably 3% or more and 80% or less, more preferably 5% or more and 70% or less. The length (L3) is a length in a state where the diaper 1 is unfolded and extended.

Preferably, the length (L1) of the inner layer folded-back portion 5E in the longitudinal direction (X direction) is preferably 20mm or more, more preferably 30mm or more, and preferably 120mm or less, more preferably 100mm or less, specifically, preferably 20mm or more and 120mm or less, more preferably 30mm or more and 100mm or less.

The length (L2) in the longitudinal direction (X direction) of the hydrophilic long-sized portion 4TL is preferably 20mm or more, more preferably 30mm or more, and preferably 100mm or less, more preferably 90mm or less, specifically, preferably 20mm or more and 100mm or less, more preferably 30mm or more and 90mm or less.

The length (L3) in the longitudinal direction (X direction) of the hydrophilic short-sized portion 4TS is preferably 1mm or more, more preferably 2mm or more, and preferably 80mm or less, more preferably 60mm or less, specifically preferably 1mm or more and 80mm or less, more preferably 2mm or more and 60mm or less.

In the diaper 1, as shown in fig. 3, the elastic member 71 preferably has at least one linear (including belt-like) elastic member in a region where the hydrophilic long-sized portion 4TL and the hydrophilic short-sized portion 4TS overlap with each other, in other words, in a region corresponding to the hydrophilic short-sized portion 4 TS. When such a linear elastic member is provided, since the density of the fibers is not easily increased in the overlapped region due to the contraction of the elastic member, the sweat absorbed in the hydrophilic region 4T is easily moved to the folded portion RP side located at the peripheral edge of the waist opening WH when the diaper 1 is worn, and the evaporation of the sweat from the peripheral edge of the waist opening WH can be promoted.

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

In the diaper 1, since the folded-back portion 5E of the inner layer sheet 5 constitutes the outer cover 3 is formed by the folded-back portion 5E of the inner layer sheet 5, the entire inner layer sheet 5 including the folded-back portion 5E of the inner layer is formed of a hydrophobic sheet made of hydrophobic fibers. In the diaper 1, the folded-back outer layer portion 6E constituting 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 outer layer portion 6E is formed of a hydrophobic sheet made of hydrophobic fibers.

Examples of the hydrophobic fibers constituting the hydrophobic sheets used in the inner sheet 5 (inner folded portion 5E) and the outer sheet 6 (including the outer folded portion 6E) include thermoplastic synthetic fibers, 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 hydrophilic agent forming the hydrophilic region 4T is not particularly limited as long as it is a general hydrophilic 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 ℃.

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 members (the elastic member 25 for forming the leakage-preventing cuffs, the elastic member 71, the leg elastic member 72, and the like) include synthetic rubbers such as styrene-butadiene, isoprene, and chloroprene rubber, natural rubbers, EVA, stretchable polyolefins, and polyurethane. As the form of the elastic member, a linear (such as a thread rubber) or belt-like (such as a rubber strip) form having a cross section in a rectangular, square, circular, elliptical, or polygonal form can be preferably used.

As the elastic member fixing adhesive for fixing the elastic members (the elastic member 25, the elastic member 71, the leg elastic member 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, the hydrophilic region 4T capable of absorbing sweat is disposed in the inner sheet 5 which is a nonwoven fabric constituting the back-side waist panel FB. As shown in fig. 2 and 3, the inner sheet 5 having the hydrophilic region 4T is folded back at the folded back portion RP, the folded back portion 5E is disposed on the side closer to the skin of the wearer than the elastic member 71 disposed in an extended state in the lateral direction (Y direction), and the hydrophilic region 4T is disposed so as to be longer in the longitudinal direction (X direction) across the folded back portion RP on the side closer to the skin of the wearer. When the hydrophilic region 4T is disposed across the folded portion RP in this way, the absorbed sweat easily moves to the folded portion RP having a high density where the hydrophilic long-sized portion 4TL and the hydrophilic short-sized portion 4TS overlap, and the sweat easily evaporates from the peripheral edge portion of the waist opening portion WH where the folded portion RP is located, so that the stuffiness of the pants-type disposable diaper when worn can be suppressed, and skin problems such as eczema, miliaria, and rash can be expected to be reduced.

In particular, in the diaper 1, the hydrophilic region 4T is formed not by a nonwoven fabric separate from the hydrophobic nonwoven fabric (inner sheet 5), but by applying a hydrophilic agent to a part of the hydrophobic nonwoven fabric (inner sheet 5) made of hydrophobic fibers. Since the separate hydrophilic sheet other than the inner sheet 5 and the outer sheet 6 is not used in this way, the rigidity of the stretch region ST of the back-side waist panel FB is not easily increased when the diaper 1 is worn, and the edge of the separate hydrophilic sheet does not irritate the skin of the wearer, so that the skin is not easily reddened, and it is expected that skin problems such as eczema, miliaria, and macules are reduced.

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 hydrophilic long-sized portion 4TL and the hydrophilic short-sized portion 4TS are preferably fixed to each other at the folded back portion RP without using an adhesive or by thermal fusion. If the hydrophilic long-sized portion 4TL and the hydrophilic short-sized portion 4TS are not fixed at least at the folded-back portion RP, the surface area of the hydrophilic region 4T where sweat evaporates can be secured, and evaporation of sweat from the skin-facing surface and the non-skin-facing surface of each of the hydrophilic long-sized portion 4TL and the hydrophilic short-sized portion 4TS of the folded-back portion RP can be promoted.

In the diaper 1, as shown in fig. 3, it is preferable that the hydrophilic long-sized section 4TL and the hydrophilic short-sized section 4TS are fixed to each other without using an adhesive or by thermal fusion in the entire region of the hydrophilic short-sized section 4 TS. If the hydrophilic long-sized portion 4TL and the hydrophilic short-sized portion 4TS are not fixed over the entire region of the hydrophilic short-sized portion 4TS, the surface area of the hydrophilic region 4T where sweat evaporates can be secured, and evaporation of sweat from the skin-facing surface and the non-skin-facing surface of each of the hydrophilic long-sized portion 4TL and the hydrophilic short-sized portion 4TS of the folded portion RP can be promoted.

The nonwoven fabric constituting the back-side waist panel FB includes an inner sheet 5 (inner folded portion 5E) formed of a hydrophobic nonwoven fabric including the hydrophilic region 4T, and an outer sheet 6 (including an outer folded portion 6E) formed of a second hydrophobic nonwoven fabric including hydrophobic fibers. The diaper 1 includes an inner sheet 5 (inner folded portion 5E) formed of a hydrophobic nonwoven fabric including the hydrophilic region 4T as a nonwoven fabric constituting the back-side waist panel FB, and an outer sheet 6 (including an outer folded portion 6E) formed of a separate second hydrophobic nonwoven fabric made of hydrophobic fibers. As shown in fig. 3, the folded-back portion 6E of the outer layer is disposed closer to the skin of the wearer than the hydrophilic long-sized portion 4 TL. In this case, the outer-layer folded-back portion 6E preferably covers the entire area of the hydrophilic long-sized portion 4 TL. When the outer layer folded back portion 6E covers the entire region of the hydrophilic long-sized portion 4TL in this way, the sweat absorbed by the hydrophilic region 4T can be prevented from moving toward the skin of the wearer by the hydrophobic outer layer folded back portion 6E.

From the viewpoint that the hydrophilic region 4T easily absorbs sweat through the outer layer folded-back portion 6E, the hydrophilic long-sized portion 4TL and the outer layer folded-back portion 6E formed of the hydrophobic nonwoven fabric are preferably fixed by a heat-welded portion disposed in the hydrophilic long-sized portion 4 TL. That is, the hydrophilic long-sized hydrophilic portion 4TL formed in the inner layer folded back portion 5E and the hydrophobic outer layer folded back portion 6E are preferably fixed to each other in the hydrophilic region 4T by a plurality of bonding portions (thermal bonding portions) formed by thermal bonding and arranged in a dispersed manner. 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, the diaper 1 may have the inner sheet 5, the inner folded-back portion 5E, the outer sheet 6, and the outer folded-back portion 6E as the nonwoven fabric constituting the back-side waist panel FB as shown in fig. 3, or may have a separate hydrophobic nonwoven fabric 9 made of hydrophobic fibers in addition to the inner sheet 5 and the outer sheet 6 as in the diaper 1 shown in fig. 4. Specifically, in the diaper 1 shown in fig. 4, the separate hydrophobic nonwoven fabric 9 is disposed between the folded-back outer layer portion 6E and the inner sheet 5, and the hydrophilic region 4T is formed by applying a hydrophilic agent to the entire region of the separate hydrophobic nonwoven fabric 9. Therefore, both the one folded portion 91 and the other folded portion 92 are disposed closer to the skin of the wearer than the elastic member 71. Therefore, in the diaper 1 shown in fig. 4, similarly to the diaper 1 shown in fig. 3, the hydrophilic long-sized portion 4TL and the hydrophilic short-sized portion 4TS are disposed on the side closer to the skin of the wearer than the elastic member 71. The hydrophilic long-sized portion 4TL is disposed closer to the skin of the wearer than the hydrophilic short-sized portion 4 TS. Further, in the diaper 1, the hydrophilic long-sized portion 4TL and the hydrophilic short-sized portion 4TS are overlapped in abutment with each other. According to the diaper 1 shown in fig. 4, the same effect as that of the diaper 1 shown in fig. 3 is obtained, and particularly, since the hydrophilic region 4T is formed over the entire region of the separate hydrophobic nonwoven fabric 9, the length of the sweat absorbing region in the lateral direction Y of the diaper 1 can be easily and freely adjusted. From the viewpoint of preventing the body fluid absorbed by the absorbent body 23 from moving, it is preferable that the inner end portion of the hydrophilic long-sized portion 4TL on the crotch region C side formed in one of the folded-back portions 91 is disposed at a distance from the rear end portion 23B of the absorbent body 23 in the longitudinal direction X.

Further, the diaper 1 includes the inner sheet 5, the inner folded-back portion 5E, the outer sheet 6, and the outer folded-back portion 6E as the nonwoven fabric constituting the back-side waist panel FB as shown in fig. 3, but may include another sheet 90 made of a separate nonwoven fabric in addition to the inner sheet 5 and the outer sheet 6 as shown in fig. 5. Specifically, in the diaper 1 shown in fig. 5, the other sheet 90 is folded back at the outer end portion 1B in the longitudinal direction X, in other words, at the folded-back portion RP located at the peripheral edge portion of the waist opening WH in the back-side region B of the diaper 1 so as to sandwich the inner sheet 5 and the outer sheet 6, and the one folded-back portion 910 is disposed on the side closer to the skin of the wearer than the elastic member 71 disposed in an extended state in the lateral direction (Y direction) and on the skin-facing surface of the inner sheet 5. The other folded portion 920 is disposed on the side farther from the skin of the wearer than the elastic member 71 and on the non-skin-facing surface of the outer sheet 6. The hydrophilic region 4T is formed by coating the entire region of the other sheet 90 with a hydrophilic agent. Thus, in the diaper 1 shown in fig. 5, the hydrophilic long-sized portion 4TL is disposed on the side closer to the skin of the wearer than the elastic member 71, the hydrophilic short-sized portion 4TS is disposed on the side farther from the skin of the wearer than the elastic member 71, and the elastic member 71 is sandwiched between the hydrophilic long-sized portion 4TL and the hydrophilic short-sized portion 4 TS. In this way, the hydrophilic long-sized portion 4TL is disposed closer to the skin of the wearer than the hydrophilic short-sized portion 4 TS. According to the diaper 1 shown in fig. 5, the same effect as that of the diaper 1 shown in fig. 3 is obtained, and in particular, since the elastic member 71 is sandwiched by the hydrophilic long-sized portion 4TL and the hydrophilic short-sized portion 4TS, the hydrophilic long-sized portion 4TL and the hydrophilic short-sized portion 4TS are easily separated from each other by interposing the elastic member 71, and evaporation of sweat from the skin-facing surface and the non-skin-facing surface of each of the hydrophilic long-sized portion 4TL and the hydrophilic short-sized portion 4TS can be promoted. From the viewpoint of keeping bodily fluid absorbed by the absorbent body 23 from moving, the inner end portion of the hydrophilic long-sized portion 4TL formed in one of the folded-back portions 910 on the crotch region C side and the rear end portion 23B of the absorbent body 23 in the longitudinal direction X are preferably disposed at a distance.

In the diaper 1 shown in fig. 5, if the inner sheet 5 and the outer sheet 6 are formed of a hydrophobic nonwoven fabric made of hydrophobic fibers, the nonwoven fabric constituting the back-side waist panel FB has the inner sheet 5 and the outer sheet 6 as hydrophobic nonwoven fabrics in addition to the other sheet 90 including the hydrophilic region 4T. According to the diaper 1 shown in fig. 5, the inner sheet 5 and the outer sheet 6 formed of the hydrophobic nonwoven fabric are sandwiched by the hydrophilic long-sized portion 4TL and the hydrophilic short-sized portion 4TS, and therefore, by interposing the hydrophobic nonwoven fabric, the hydrophilic long-sized portion 4TL and the hydrophilic short-sized portion 4TS are spaced from each other, and evaporation of sweat from the skin-facing surface and the non-skin-facing surface of each of the hydrophilic long-sized portion 4TL and the hydrophilic short-sized portion 4TS can be promoted.

In the diaper 1 shown in fig. 5, a laminate sheet of a hydrophilic nonwoven fabric made of hydrophilic fibers and a hydrophobic nonwoven fabric made of hydrophobic fibers can be used as the other sheet 90. In the case of using such a laminated sheet as the other sheet 90, it is preferable to laminate in such a manner that: in one folded portion 910, a hydrophobic nonwoven fabric is disposed on the skin-facing surface of the hydrophilic nonwoven fabric, and in the other folded portion 920, a hydrophobic nonwoven fabric is disposed on the non-skin-facing surface of the hydrophilic nonwoven fabric. In this way, when the hydrophobic nonwoven fabric is disposed on the skin-facing surface of the hydrophilic nonwoven fabric in the one folded portion 910, sweat absorbed by the hydrophilic nonwoven fabric can be prevented from moving to the skin of the wearer through the hydrophobic nonwoven fabric. In addition, from the viewpoint that the hydrophilic nonwoven fabric easily absorbs sweat through the hydrophobic nonwoven fabric covering the hydrophilic nonwoven fabric, the hydrophilic nonwoven fabric and the hydrophobic nonwoven fabric are preferably fixed by a heat-fusion portion disposed in the hydrophilic nonwoven fabric. The hydrophilic nonwoven fabric and the hydrophobic nonwoven fabric are preferably fixed to each other at a plurality of bonding portions (thermal bonding portions) formed by thermal bonding, the bonding portions being arranged in a scattered manner in the hydrophilic nonwoven fabric. Such a heat-fused portion can be formed by various known methods such as heat sealing, ultrasonic sealing, and high-frequency sealing.

Further, the diaper 1 described above has the inner sheet 5, the inner folded-back portion 5E, the outer sheet 6, and the outer folded-back portion 6E as the nonwoven fabric constituting the back-side waist panel FB as shown in fig. 3, and the hydrophilic region 4T is formed in the inner sheet 5 and a part of the inner folded-back portion 5E, but the hydrophilic region 4T may be formed in the outer sheet 6 and a part of the outer folded-back portion 6E as in the diaper 1 shown in fig. 6. In the diaper 1 shown in fig. 6, the inner sheet 5 and the outer sheet 6 are formed of a hydrophobic nonwoven fabric, and a hydrophilic region 4T is formed by coating a part of the outer sheet 6 with a hydrophilic agent. The hydrophilic region 4T of the hydrophobic nonwoven fabric (outer sheet 6) extends across the folded portion RP so that the side closer to the skin of the wearer is longer in the longitudinal direction (X direction). In the diaper 1 shown in fig. 6, the hydrophilic region 4T of the outer sheet 6 is divided into a hydrophilic long-sized portion 4TL and a hydrophilic short-sized portion 4TS, the hydrophilic long-sized portion 4TL being disposed on the side close to the skin of the wearer and extending from the folded portion RP in the longitudinal direction (X direction) to be longer, and the hydrophilic short-sized portion 4TS being shorter than the hydrophilic long-sized portion 4TL in the longitudinal direction (X direction).

In the diaper 1 shown in fig. 6, the hydrophilic long-sized portion 4TL is disposed closer to the wearer's skin than the elastic member 71, the hydrophilic short-sized portion 4TS is disposed farther from the wearer's skin than the elastic member 71, and the elastic member 71 is sandwiched between the hydrophilic long-sized portion 4TL and the hydrophilic short-sized portion 4 TS. Thus, the hydrophilic long-sized portion 4TL is disposed closer to the skin of the wearer than the hydrophilic short-sized portion 4 TS. According to the diaper 1 shown in fig. 6, the same effect as that of the diaper 1 shown in fig. 3 is obtained, and in particular, since the elastic member 71 is sandwiched by the hydrophilic long-sized portion 4TL and the hydrophilic short-sized portion 4TS, the hydrophilic long-sized portion 4TL and the hydrophilic short-sized portion 4TS are easily separated from each other by the interposition of the elastic member 71, and the evaporation of sweat from the skin-facing surface and the non-skin-facing surface of each of the hydrophilic long-sized portion 4TL and the hydrophilic short-sized portion 4TS can be promoted. From the viewpoint of preventing the body fluid absorbed by the absorbent body 23 from moving, the inner end portion of the hydrophilic long-sized portion 4TL on the crotch region C side formed in the outer-layer folded-back portion 6E and the rear end portion 23B of the absorbent body 23 in the longitudinal direction X are preferably disposed at an interval.

In the diaper 1 shown in fig. 6, since the inner sheet 5 is also formed of a hydrophobic nonwoven fabric made of hydrophobic fibers, the nonwoven fabric constituting the back-side waist panel FB has the inner sheet 5 made of a hydrophobic nonwoven fabric in addition to the outer sheet 6 made of a hydrophobic nonwoven fabric including the hydrophilic regions 4T. According to the diaper 1 shown in fig. 6, since the inner sheet 5 formed of the hydrophobic nonwoven fabric is sandwiched by the hydrophilic long-sized portion 4TL and the hydrophilic short-sized portion 4TS, the hydrophilic long-sized portion 4TL and the hydrophilic short-sized portion 4TS are separated from each other by the interposition of the hydrophobic nonwoven fabric, and the evaporation of sweat from the skin-facing surface and the non-skin-facing surface of each of the hydrophilic long-sized portion 4TL and the hydrophilic short-sized portion 4TS can be promoted. From the viewpoint of further spacing the hydrophilic long-sized portion 4TL and the hydrophilic short-sized portion 4TS, the diaper 1 shown in fig. 6 may be configured such that the inner sheet 5 has a folded-back portion 5E folded back at a folded-back portion RP located at the outer end portion 1B in the longitudinal direction X of the back-side region B of the diaper 1.

Further, the diaper 1 described above has the inner sheet 5, the inner folded-back portion 5E, the outer sheet 6, and the outer folded-back portion 6E as the nonwoven fabric constituting the back-side waist panel FB as shown in fig. 3, and the hydrophilic region 4T is formed in the inner sheet 5 and a part of the inner folded-back portion 5E, but the inner sheet 5 may be formed by the outer folded-back portion 6E of the outer sheet 6 and the hydrophilic region 4T may be formed in the outer sheet 6 and a part of the outer folded-back portion 6E as in the diaper 1 shown in fig. 7. In the diaper 1 shown in fig. 7, the outer sheet 6 is formed of a hydrophobic nonwoven fabric, and a hydrophilic region 4T is formed by coating a part of the outer sheet 6 with a hydrophilic agent. The hydrophilic region 4T of the hydrophobic nonwoven fabric (outer sheet 6) extends across the folded portion RP so as to be long in the longitudinal direction (X direction) on the side closer to the skin of the wearer. In the diaper 1 shown in fig. 7, the hydrophilic region 4T is divided into a hydrophilic long-sized portion 4TL and a hydrophilic short-sized portion 4TS, the hydrophilic long-sized portion 4TL being disposed on the side close to the skin of the wearer and extending longer in the longitudinal direction (X direction) from the folded-back portion RP, and the hydrophilic short-sized portion 4TS being shorter in the longitudinal direction (X direction) than the hydrophilic long-sized portion 4 TL. The inner sheet 5 of the diaper 1 shown in fig. 7 is formed by the folded-back outer layer portion 6E of the outer sheet 6, and has a high air permeability and is easily evaporated because of a small number of components, and the material cost can be reduced.

In the diaper 1 shown in fig. 7, the hydrophilic long-sized portion 4TL is disposed closer to the skin of the wearer than the elastic member 71, the hydrophilic short-sized portion 4TS is disposed farther from the skin of the wearer than the elastic member 71, and the elastic member 71 is sandwiched between the hydrophilic long-sized portion 4TL and the hydrophilic short-sized portion 4 TS. Thus, the hydrophilic long-sized portion 4TL is disposed closer to the skin of the wearer than the hydrophilic short-sized portion 4 TS. According to the diaper 1 shown in fig. 7, the same effect as that of the diaper 1 shown in fig. 3 is obtained, and in particular, since the elastic member 71 is sandwiched by the hydrophilic long-sized portion 4TL and the hydrophilic short-sized portion 4TS, the hydrophilic long-sized portion 4TL and the hydrophilic short-sized portion 4TS are easily separated from each other by the insertion of the elastic member 71, and the evaporation of sweat from the skin-facing surface and the non-skin-facing surface of each of the hydrophilic long-sized portion 4TL and the hydrophilic short-sized portion 4TS can be promoted. From the viewpoint of preventing the body fluid absorbed by the absorbent body 23 from moving, it is preferable that the inner end portion on the crotch region C side of the hydrophilic long-sized portion 4TL formed in the outer-layer folded-back portion 6E and the rear end portion 23B in the longitudinal direction X of the absorbent body 23 are disposed at a spacing.

Further, the diaper 1 described above has the inner sheet 5, the inner folded-back portion 5E, the outer sheet 6, and the outer folded-back portion 6E as the nonwoven fabric constituting the back-side waist panel FB as shown in fig. 3, and the hydrophilic region 4T is formed in a part of the inner sheet 5 and the inner folded-back portion 5E, but may have a form not having the outer folded-back portion 6E as in the diaper 1 shown in fig. 8. In the diaper 1 shown in fig. 8, the folded-back inner layer portion 5E of the inner layer sheet 5 covers the rear end portion 23B in the longitudinal direction X of the absorbent body 23, that is, the end portion in the longitudinal direction X of the absorbent main body 2. The hydrophilic region 4T of the hydrophobic nonwoven fabric (inner sheet 5) extends across the folded portion RP so as to be long in the longitudinal direction (X direction) on the side close to the skin of the wearer. In the diaper 1 shown in fig. 8, the hydrophilic region 4T is divided into a hydrophilic long-sized portion 4TL and a hydrophilic short-sized portion 4TS, the hydrophilic long-sized portion 4TL being disposed on the side close to the skin of the wearer and extending longer in the longitudinal direction (X direction) from the folded-back portion RP, and the hydrophilic short-sized portion 4TS being shorter in the longitudinal direction (X direction) than the hydrophilic long-sized portion 4 TL.

In the diaper 1 shown in fig. 8, the hydrophilic long-sized portion 4TL and the hydrophilic short-sized portion 4TS are disposed closer to the wearer's skin than the elastic member 71, and the hydrophilic long-sized portion 4TL is disposed closer to the wearer's skin than the hydrophilic short-sized portion 4 TS. In the diaper 1, the back-side waist panel FB and the abdomen-side waist panel FA are formed by joining and fixing the inner sheet 5 and the outer sheet 6 at a plurality of joining portions 8 formed by thermal welding arranged in a scattered manner, a plurality of elastic members 71 are provided between the inner sheet 5 and the outer sheet 6 fixed at the joining portions 8, and the plurality of elastic members 71 are arranged in a state of being elongated in the transverse direction (Y direction) and are intermittently arranged in the longitudinal direction (X direction). According to the diaper 1 shown in fig. 8, the same effects as those of the diaper 1 shown in fig. 3 are obtained, and the above three items interact with each other to facilitate evaporation of sweat of the absorbed sweat (1) by forming the hydrophilic region 4T in a part of the inner sheet 5 and the inner layer folded-back portion 5E, (2) opening the space between the inner sheet 5 and the outer sheet 6 at the waist opening portion WH, and (3) forming a space between the nonwoven fabrics constituting the back-side waist panel FB when the elastic member 71 contracts. From the viewpoint of preventing the body fluid absorbed by the absorbent body 23 from moving, it is preferable that the inner end portion on the crotch region C side of the hydrophilic long-sized portion 4TL formed in the inner-layer folded-back portion 5E and the rear end portion 23B in the longitudinal direction X of the absorbent body 23 are disposed at a spacing.

The absorbent article of the present invention is not limited to any of the diapers 1 shown in fig. 3 to 8, and can be modified as appropriate. The components of the diaper 1 shown in fig. 3 to 8 can be combined and implemented as appropriate without departing from the scope of the present invention.

As shown in fig. 3, the elastic members 71 of the diaper 1 may be all linear (including belt-like) elastic members, or may be formed of film-like elastic fiber layers or elastic fiber layers made of elastic fibers.

In the disposable diaper 1, as shown in fig. 2, the hydrophilic region 4T is disposed only in the back-side waist panel FB, and the hydrophilic region 4T is formed by applying a hydrophilic agent to the stretchable region ST, and the hydrophilic region 4T may be disposed also in the abdomen-side waist panel FA.

In the disposable diaper 1 described above, as shown in fig. 2, the outer cover 3 may be a pants-type disposable diaper having a continuous shape such as an hourglass shape extending over the abdomen-side region a, the crotch region C, and the back-side region B, or may be a divided-type disposable diaper in which the outer cover 3 is divided into an abdomen-side outer cover, a back-side outer cover, and a crotch-side outer cover as separate members.

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

The following disposable diaper is further disclosed with respect to the above embodiment.

＜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 comprises an absorbent body extending across the abdomen-side region and the back-side region, and an abdomen-side waist flap and a back-side waist flap located outside the front and rear end portions of the absorbent body in the longitudinal direction and extending in the transverse direction,

the back-side waist panel is formed with an extensible region comprising elastic members disposed in an extended state in the lateral direction,

the back-side waist panel has a nonwoven fabric comprising hydrophilic regions and formed of hydrophilic fibers in the stretchable region,

the nonwoven fabric including the hydrophilic region is folded back at a folded back portion located at an outer end in the longitudinal direction of the back-side region, at least one folded back portion is located closer to the skin of the wearer than the elastic member,

the hydrophilic region extends across the folded portion so that the longitudinal length thereof is longer on the side closer to the skin of the wearer.

＜2＞

The disposable diaper according to the above < 1 >, wherein the hydrophilic region is divided into a hydrophilic long-sized portion which is disposed on a side close to the skin of the wearer and extends longer in the longitudinal direction from the folded back portion, and a hydrophilic short-sized portion which is disposed on a side farther from the skin of the wearer from the hydrophilic long-sized portion and is shorter in the longitudinal direction than the hydrophilic long-sized portion,

the hydrophilic long-sized portion and the hydrophilic short-sized portion are not fixed at the folded portion.

＜3＞

The disposable diaper according to the above < 2 >, wherein the hydrophilic long-size portion and the hydrophilic short-size portion are not fixed to each other over the entire region of the hydrophilic short-size portion.

＜4＞

The disposable diaper according to any one of the above < 1 > to < 3 >, wherein the hydrophilic region is divided into a hydrophilic long-sized portion that is disposed closer to the skin of the wearer than the elastic member and extends longer in the longitudinal direction from the folded-back portion, and a hydrophilic short-sized portion that is shorter in the longitudinal direction than the hydrophilic long-sized portion,

the hydrophilic short-sized portion is disposed closer to the skin of the wearer than the elastic member,

the hydrophilic long-sized portion and the hydrophilic short-sized portion sandwich the elastic member.

＜5＞

The disposable diaper according to any one of the above < 1 > to < 4 >, wherein the hydrophilic region is divided into a hydrophilic long-sized portion that is disposed closer to the skin of the wearer than the elastic member and extends longer in the longitudinal direction from the folded-back portion, and a hydrophilic short-sized portion that is shorter in the longitudinal direction than the hydrophilic long-sized portion,

the hydrophilic short-sized portion is disposed on a side farther from the skin of the wearer than the elastic member,

the nonwoven fabric constituting the back-side waist panel has a hydrophobic nonwoven fabric composed of hydrophobic fibers in addition to the nonwoven fabric including the hydrophilic region,

the hydrophobic nonwoven fabric is sandwiched between the hydrophilic long-sized portion and the hydrophilic short-sized portion.

＜6＞

The disposable diaper according to any one of the above < 1 > to < 5 >, wherein the hydrophilic region is divided into a hydrophilic long-sized portion that is disposed on a side close to the skin of the wearer and extends long in the longitudinal direction from the folded back portion, and a hydrophilic short-sized portion that is disposed on a side farther from the skin of the wearer from the hydrophilic long-sized portion and is shorter in the longitudinal direction than the hydrophilic long-sized portion,

the elastic member is not fixed to the hydrophilic short-sized portion in the widthwise central region.

＜7＞

The disposable diaper according to any one of the above < 1 > to < 6 >, wherein the hydrophilic region is divided into a hydrophilic long-sized portion that is disposed on a side close to the skin of the wearer and extends long in the longitudinal direction from the folded back portion, and a hydrophilic short-sized portion that is disposed on a side farther from the skin of the wearer from the hydrophilic long-sized portion and is shorter in the longitudinal direction than the hydrophilic long-sized portion,

the nonwoven fabric constituting the back-side waist panel has a second hydrophobic nonwoven fabric made of hydrophobic fibers in addition to the nonwoven fabric including the hydrophilic region,

the second hydrophobic nonwoven fabric is disposed closer to the skin of the wearer than the hydrophilic long-sized portion.

＜8＞

The disposable diaper according to the above < 7 >, wherein the second hydrophobic nonwoven fabric and the hydrophilic long-sized portion are fixed by a heat-fusion bonded portion.

＜9＞

The disposable diaper according to any one of the above < 1 > to < 8 >, wherein the hydrophilic region is formed by applying a hydrophilic agent to a part of the entire region of the nonwoven fabric including the hydrophilic region constituting the back-side waist panel.

＜10＞

The disposable diaper according to any one of the above < 1 > to < 9 >, wherein the hydrophilic region is formed by applying a hydrophilic agent to a hydrophobic nonwoven fabric.

＜11＞

The disposable diaper according to any one of the above < 1 > to < 10 >, wherein the back-side waist panel has, in the stretchable region, an inner layer sheet formed of a hydrophobic nonwoven fabric composed of hydrophobic fibers as the nonwoven fabric constituting the back-side waist panel, the inner layer sheet including the hydrophilic region formed by applying a hydrophilic agent over the entire length in the lateral direction.

＜12＞

The disposable diaper according to any one of the above < 1 > to < 11 >, wherein the stretchable region has a waist stretchable part and a lower waist stretchable part,

the hydrophilic region is disposed in an extensible region of the back-side waist panel, that is, a region where the waist extensible part and a part of the lower waistline extensible part are combined.

＜13＞

The disposable diaper according to any one of the above < 1 > to < 12 >, wherein the hydrophilic region is divided into a hydrophilic long-sized portion that is disposed on a side close to the skin of the wearer and extends long in the longitudinal direction from the folded back portion, and a hydrophilic short-sized portion that is disposed on a side farther from the skin of the wearer from the hydrophilic long-sized portion and is shorter in the longitudinal direction than the hydrophilic long-sized portion,

the hydrophilic long-sized portion and the hydrophilic short-sized portion are respectively disposed closer to the skin of the wearer than the elastic member,

the hydrophilic long-sized portion is disposed closer to the skin of the wearer than the hydrophilic short-sized portion.

＜14＞

The disposable diaper according to any one of the above < 1 > to < 13 >, wherein the hydrophilic region is divided into a hydrophilic long-sized portion that is disposed on a side close to the skin of the wearer and extends long in the longitudinal direction from the folded back portion, and a hydrophilic short-sized portion that is disposed on a side farther from the skin of the wearer from the hydrophilic long-sized portion and is shorter in the longitudinal direction than the hydrophilic long-sized portion,

the hydrophilic long-sized portion and the hydrophilic short-sized portion are overlapped so as to abut against each other.

＜15＞

The disposable diaper according to any one of the above < 1 > to < 14 >, wherein the hydrophilic region is divided into a hydrophilic long-sized portion that is disposed on a side close to the skin of the wearer and extends long in the longitudinal direction from the folded back portion, and a hydrophilic short-sized portion that is disposed on a side farther from the skin of the wearer from the hydrophilic long-sized portion and is shorter in the longitudinal direction than the hydrophilic long-sized portion,

the ratio of the longitudinal length (L2) of the hydrophilic long-sized portion to the longitudinal length (L1) of the one folded portion ((L2/L1) × 100) is 80% or more, preferably 90% or more, and the upper limit is 100%.

＜16＞

The disposable diaper according to any one of the above < 1 > to < 15 >, wherein the hydrophilic region is divided into a hydrophilic long-sized portion that is disposed on a side close to the skin of the wearer and extends long in the longitudinal direction from the folded back portion, and a hydrophilic short-sized portion that is disposed on a side farther from the skin of the wearer from the hydrophilic long-sized portion and is shorter in the longitudinal direction than the hydrophilic long-sized portion,

the hydrophilic long-size portion does not reach an inner end portion of the one folded portion on the crotch region side, and a hydrophobic region made of hydrophobic constituent fibers is present at the inner end portion.

＜17＞

the hydrophilic long-sized portion is formed over the entire region of the one folded portion.

＜18＞

The disposable diaper according to any one of the above < 1 > to < 17 >, wherein an inner end portion of the one folded-back portion on the crotch region side and an end portion of the absorbent body in the longitudinal direction are disposed with a gap therebetween.

＜19＞

The disposable diaper according to any one of the above < 1 > to < 18 >, wherein the hydrophilic region is divided into a hydrophilic long-sized portion that is disposed on a side close to the skin of the wearer and extends long in the longitudinal direction from the folded back portion, and a hydrophilic short-sized portion that is disposed on a side farther from the skin of the wearer from the hydrophilic long-sized portion and is shorter in the longitudinal direction than the hydrophilic long-sized portion,

the ratio ((L3/L2) × 100) of the longitudinal length (L3) of the hydrophilic short-sized portion to the longitudinal length (L2) of the hydrophilic long-sized portion is 3% or more, preferably 5% or more, and 80% or less, preferably 70% or less.

＜20＞

The disposable diaper according to any one of the above < 1 > -19 >, wherein a longitudinal length (L1) of the one folded portion is 20mm or more, preferably 30mm or more, and 120mm or less, preferably 100mm or less.

＜21＞

The disposable diaper according to any one of the above < 1 > to < 20 >, wherein the hydrophilic region is divided into a hydrophilic long-sized portion that is disposed on a side close to the skin of the wearer and extends long in the longitudinal direction from the folded back portion, and a hydrophilic short-sized portion that is disposed on a side farther from the skin of the wearer from the hydrophilic long-sized portion and is shorter in the longitudinal direction than the hydrophilic long-sized portion,

the length (L2) of the hydrophilic long dimension portion in the longitudinal direction is 20mm or more, preferably 30mm or more, and 100mm or less, preferably 90mm or less.

＜22＞

The disposable diaper according to any one of the above < 1 > to < 21 >, wherein the hydrophilic region is divided into a hydrophilic long-sized portion that is disposed on a side close to the skin of the wearer and extends long in the longitudinal direction from the folded back portion, and a hydrophilic short-sized portion that is disposed on a side farther from the skin of the wearer from the hydrophilic long-sized portion and is shorter in the longitudinal direction than the hydrophilic long-sized portion,

the length (L3) of the hydrophilic short-sized portion in the longitudinal direction is 1mm or more, preferably 2mm or more, and 80mm or less, preferably 60mm or less.

＜23＞

The disposable diaper according to any one of the above < 1 > to < 22 >, wherein the nonwoven fabric constituting the back-side waist panel has a sheet other than the nonwoven fabric including the hydrophilic region,

as the other sheet, a laminate sheet of a hydrophilic nonwoven fabric made of hydrophilic fibers and a hydrophobic nonwoven fabric made of hydrophobic fibers is used.

＜24＞

The disposable diaper according to < 23 > wherein the other sheet is folded back at the outer end portion in the longitudinal direction of the back-side region of the disposable diaper with the nonwoven fabric including the hydrophilic region interposed therebetween, one folded-back portion is disposed closer to the skin of the wearer than the elastic member disposed in an extended state in the transverse direction and on the skin-facing surface of the nonwoven fabric including the hydrophilic region, and the other folded-back portion is disposed farther from the skin of the wearer than the elastic member and on the non-skin-facing surface of the nonwoven fabric including the hydrophilic region,

the other sheets are laminated as follows: the hydrophobic nonwoven fabric is disposed on the skin-facing surface of the nonwoven fabric including the hydrophilic region in the one folded portion, and the hydrophobic nonwoven fabric is disposed on the non-skin-facing surface of the nonwoven fabric including the hydrophilic region in the other folded portion.

＜25＞

The disposable diaper according to any one of the above < 1 > to < 24 >, wherein the nonwoven fabric including the hydrophilic region has an inner layer sheet, an inner layer folded back portion, an outer layer sheet, and an outer layer folded back portion,

the hydrophilic region is formed in the outer sheet and a part of the folded-back portion of the outer sheet.

＜26＞

The disposable diaper according to < 25 > above, wherein the inner layer sheet and the outer layer sheet are formed of a hydrophobic nonwoven fabric, and the hydrophilic region is formed by applying a hydrophilic agent to a part of the outer layer sheet.

＜27＞

the inner layer sheet is formed by the outer layer folded-back portion of the outer layer sheet,

＜28＞

The disposable diaper according to any one of the above < 1 > to < 27 >, wherein the hydrophilic region is formed in the back-side waist panel and the abdomen-side waist panel,

the hydrophilic region on the abdomen-side waist panel side has the same degree of hydrophilicity as the hydrophilic region on the back-side waist panel side.

＜29＞

The disposable diaper according to any one of the above < 1 > to < 28 >, wherein the disposable diaper has an outer package,

the outer package has an outer sheet forming the non-skin-facing surface side of the outer surface of the disposable diaper, an outer folded portion closest to the skin-facing surface side, and an inner sheet and an inner folded portion disposed between the outer sheet and the outer folded portion,

the inner-layer folded-back portion formed by one folded-back portion of the inner-layer sheet is formed in a laterally long rectangular shape in the back-side region.

＜30＞

The disposable diaper according to any one of the above < 1 > to < 29 >, wherein the disposable diaper has an outer package,

the outer-layer folded-back portions formed by the folded-back portions of the outer-layer sheet are formed in a laterally long rectangular shape in the abdominal-side region and the back-side region, respectively.

＜31＞

The disposable diaper according to any one of the above < 1 > to < 30 >, wherein the disposable diaper has an outer package,

the back-side waist panel is provided with the outer layer folded-back portion, the inner layer sheet, and the outer layer sheet in this order from the side closer to the skin of the wearer to the side farther away from the skin.

＜32＞

The disposable diaper according to any one of the above < 1 > to < 31 >, wherein the disposable diaper has an outer package,

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

the back-side waist panel and the abdomen-side waist panel are formed by joining and fixing the inner sheet and the outer sheet at a plurality of joining portions formed by thermal fusion bonding, the joining portions being arranged in a scattered manner.

＜33＞

The disposable diaper according to the above < 32 >, wherein the stretchable region has a waist stretchable part and a lower waist stretchable part,

in a region from the waist stretchable part to the lower waist stretchable part in each of the abdominal region and the back region, the inner layer sheet and the outer layer sheet are intermittently arranged so as to form a line in a longitudinal direction, and a plurality of lines of joined portions each formed of a plurality of the joined portions are arranged at intervals in a transverse direction,

in a region from the waist stretchable portion to the lower waist stretchable portion in each of the abdominal region and the back region, a plurality of elastic members are disposed in a laterally stretched state through a gap between the joint portions in each of the plurality of joint portion rows.

＜34＞

The disposable diaper according to any one of the above < 1 > to < 33 >, wherein the disposable diaper comprises an absorbent body having the absorbent body, and an exterior body disposed on a non-skin-facing surface side of the absorbent body to fix the absorbent body,

the outer package has an outer sheet and an inner sheet forming the non-skin-facing surface side of the outer surface of the disposable diaper,

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

＜35＞

The disposable diaper according to any one of the above < 1 > to < 34 >, wherein the disposable diaper comprises an absorbent body having the absorbent body, and an exterior body disposed on a non-skin-facing surface side of the absorbent body to fix the absorbent body,

the disposable diaper has a pair of outer fixing regions in which the inner layer sheet and the outer layer sheet are joined to each other with an elastic member fixing 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,

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

Industrial applicability of the invention

According to the present invention, it is expected to reduce skin problems such as eczema, miliaria, and macula.

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 an absorbent body is provided across the abdomen-side region and the back-side region, and the abdomen-side waist flap and the back-side waist flap are located outside of front and rear end portions of the absorbent body in the longitudinal direction and extend in the transverse direction, the disposable diaper characterized in that:

an elastic region formed by an elastic member disposed in a laterally extended state is formed in the back-side waist panel,

the back-side waist panel has a nonwoven fabric comprising hydrophilic regions and formed of hydrophilic fibers in the stretch region,

the nonwoven fabric including the hydrophilic region is folded back at a folded-back portion which is located at an outer end in the longitudinal direction of the back-side region, at least one folded-back portion is disposed closer to the skin of the wearer than the elastic member,

the hydrophilic region spans the folded back portion so that the length in the longitudinal direction thereof is longer on the side closer to the skin of the wearer,

the hydrophilic region is divided into a hydrophilic long-sized portion that is disposed on a side close to the skin of the wearer and extends longer in the longitudinal direction from the folded-back portion, and a hydrophilic short-sized portion that is disposed on a side farther from the skin of the wearer from the hydrophilic long-sized portion and is shorter in the longitudinal direction than the hydrophilic long-sized portion,

the nonwoven fabric constituting the back-side waist panel has a second hydrophobic nonwoven fabric composed of hydrophobic fibers in addition to the nonwoven fabric including the hydrophilic region,

the second hydrophobic nonwoven fabric is disposed on the side closer to the skin of the wearer than the hydrophilic long-sized portion.

2. The disposable diaper of claim 1, wherein:

the hydrophilic long-sized portion and the hydrophilic short-sized portion are not fixed at the folded-back portion.

3. The disposable diaper of claim 2, wherein:

the hydrophilic long-sized portion and the hydrophilic short-sized portion are not fixed to each other over the entire area of the hydrophilic short-sized portion.

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

the hydrophilic region is divided into a hydrophilic long-sized portion that is disposed closer to the skin of the wearer than the elastic member and extends longer in the longitudinal direction from the folded-back portion, and a hydrophilic short-sized portion that is shorter in the longitudinal direction than the hydrophilic long-sized portion,

the elastic member is sandwiched by the hydrophilic long-sized portion and the hydrophilic short-sized portion.

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

the hydrophilic long-sized portion is disposed on a side closer to the skin of the wearer than the hydrophilic short-sized portion.

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

the hydrophobic nonwoven fabric is sandwiched by the hydrophilic long-sized portion and the hydrophilic short-sized portion.

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

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

the second hydrophobic nonwoven fabric and the hydrophilic long-size part are fixed by a hot-melting part.

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

the hydrophilic region is formed by applying a hydrophilic agent to a part of the entire region of the nonwoven fabric including the hydrophilic region constituting the back-side waist panel.

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

the hydrophilic region is formed by coating a hydrophilic agent on a hydrophobic nonwoven fabric.

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

the back-side waist panel has, in the stretchable region, an inner sheet formed of a hydrophobic nonwoven fabric made of hydrophobic fibers as the nonwoven fabric constituting the back-side waist panel, and the inner sheet includes the hydrophilic region formed by applying a hydrophilic agent over the entire length in the lateral direction.

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

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

the hydrophilic region is disposed in an extensible region of the back-side waist panel, that is, a region in which the waist extensible part and a part of the lower waistline extensible part are integrated.

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

the hydrophilic long-sized portion and the hydrophilic short-sized portion are overlapped in such a manner as to abut against each other.

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

the ratio of the longitudinal length L2 of the hydrophilic long-sized section to the longitudinal length L1 of the one folded-back portion ((L2/L1) × 100) is 80% or more, and the upper limit is 100%.

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

the hydrophilic long-sized portion does not reach an inner end portion of the one folded portion on the crotch region side, and a hydrophobic region composed of hydrophobic constituent fibers is present at the inner end portion.

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

the entire region of the one folded-back portion becomes the hydrophilic long-sized portion.

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

an inner end portion of the one folded-back portion on the crotch region side and an end portion of the absorbent body in the longitudinal direction are disposed at a distance.

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

the ratio of the longitudinal length L3 of the hydrophilic short-sized section to the longitudinal length L2 of the hydrophilic long-sized section ((L3/L2) × 100) is 3% to 80%.

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

the longitudinal length L1 of the one folded portion is 20mm to 120 mm.

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

the length L2 in the longitudinal direction of the hydrophilic long-sized section is 20mm to 100 mm.

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

the length L3 in the longitudinal direction of the hydrophilic short-sized section is 1mm to 80 mm.

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

the nonwoven fabric constituting the back-side waist panel includes 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, and a separate sheet made of a nonwoven fabric including the hydrophilic region.

23. The disposable diaper of claim 22 wherein:

the other sheet is a laminate of a hydrophilic nonwoven fabric comprising hydrophilic fibers and a hydrophobic nonwoven fabric comprising hydrophobic fibers,

the other sheet is folded back at the folded back portion so as to sandwich the inner sheet and the outer sheet, a hydrophobic nonwoven fabric is disposed on the skin-facing surface of the hydrophilic nonwoven fabric at the folded back portion disposed on one of the skin-facing surfaces of the inner sheet, and a hydrophobic nonwoven fabric is disposed on the non-skin-facing surface of the hydrophilic nonwoven fabric at the folded back portion disposed on the other of the non-skin-facing surfaces of the outer sheet.

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

the nonwoven fabric including the hydrophilic region has an inner layer sheet, an inner layer folded back portion, an outer layer sheet, and an outer layer folded back portion,

25. The disposable diaper of claim 24 wherein:

the inner layer sheet and the outer layer sheet are formed of a hydrophobic nonwoven fabric, and the hydrophilic region is formed by applying a hydrophilic agent to a part of the outer layer sheet.

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

the inner sheet is formed by the outer layer folded-back portion of the outer sheet,

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

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

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

the disposable diaper is provided with an outer package body,

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

the disposable diaper is provided with an outer package body,

the outer-layer folded-back portions formed by the folded-back portions of the outer sheet are formed in a laterally long rectangular shape in the abdominal-side region and the back-side region, respectively.

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

the disposable diaper is provided with an outer package body,

the back-side waist panel is provided with the outer layer folded-back portion, the inner layer sheet, and the outer layer sheet in this order from the side close to the wearer's skin to the side away from the wearer's skin.

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

the disposable diaper is provided with an outer package body,

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

the back-side waist panel and the abdomen-side waist panel are formed by joining and fixing the inner sheet and the outer sheet at a plurality of joining portions formed by thermal welding, the joining portions being arranged in a scattered manner.

32. The disposable diaper of claim 31, wherein:

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 joint portions formed by the plurality of joint portions are arranged in the transverse direction at intervals,

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

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

the disposable diaper comprises an absorbent body having the absorbent body, and an outer covering body disposed on a non-skin-facing surface side of the absorbent body to fix the absorbent body,

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