WO2018116479A1

WO2018116479A1 - Disposable diaper

Info

Publication number: WO2018116479A1
Application number: PCT/JP2016/088577
Authority: WO
Inventors: 優子福田
Original assignee: 花王株式会社
Priority date: 2016-12-22
Filing date: 2016-12-22
Publication date: 2018-06-28
Also published as: JP6382481B1; CN110087600A; CN110087600B; RU2716314C1; JPWO2018116479A1

Abstract

This disposable diaper (1) has a stretch area (ST) made from an elastic member (71) formed on the stomach-side waist flap (FA) and the rear-side waist flap (FB), and has a sweat-absorbing sheet (4) positioned in said stretch area (ST). The sweat-absorbing sheet (4) is positioned closer to the skin of the wearer than the elastic member (71). The sweat-absorbing sheet (4) on the rear area (B) side has a longer direction in the (X) direction thereof than the (X) direction of the sweat-absorbing sheet (4) on the stomach-side area (A) side. The stretch area (ST) on which the rear-side area (B)-side sweat-absorbing sheet (4) is positioned has a shrinkage stress in the (Y) direction which is greater than the shrinkage stress in the (Y) direction of the stretch area (ST) on which the stomach-side area (A)-side sweat-absorbing sheet (4) is positioned.

Description

Disposable diapers

The present invention relates to a disposable diaper.

Disposable diapers include so-called pants-type disposable diapers in which an exterior body is arranged outside a vertically long absorbent main body provided with an absorber. The applicant previously arranged a hydrophilic web having long fibers highly oriented in the width direction on the dorsal end flap in the exterior body of such a pants-type disposable diaper, absorbed sweat, and eczema. In addition, a technique that can effectively prevent the occurrence of rashes and the like has been proposed (for example, Patent Document 1).

Patent Document 2 discloses a disposable diaper in which a sweat-absorbing sheet that absorbs sweat is joined to a hydrophobic sheet that covers the inner surfaces of the front and rear waist areas of the diaper.

JP 2006-141549 A JP 2007-259874 A

The present invention includes a ventral region and a dorsal region in the vertical direction, and a crotch region positioned therebetween, and has an absorber over the ventral region and the dorsal region, and the absorber In the disposable diaper having a ventral waist flap and a dorsal waist flap extending laterally from the longitudinal front and rear ends of the ventral waist flap and the dorsal waist flap, respectively, A stretchable region is formed by an elastic member disposed in a stretched state in the lateral direction, and a hydrophilic sweat absorbent sheet portion capable of absorbing sweat is disposed in the stretchable region. The sweat-absorbing sheet portion is disposed over a region within the total lateral length of the ventral waist flap and a region within the lateral total length of the dorsal waist flap, and the skin of the wearer than the elastic member. It is arranged on the side close to. The longitudinal direction length of the sweat absorbing sheet portion on the back side region side is longer than the longitudinal length of the sweat absorbing sheet portion on the ventral region side. The expansion / contraction region in which the sweat absorbing sheet portion on the back region side is disposed has a lateral contraction stress, and the contraction stress in the lateral direction of the expansion region in which the sweat absorbing sheet portion on the ventral region side is disposed. Bigger than.

FIG. 1 is a perspective view of a pants-type disposable diaper that is a preferred embodiment of the present invention. FIG. 2 is a partially broken plan view of the diaper shown in FIG. 1 unfolded and stretched as viewed from the skin contact surface side. 3 is a cross-sectional view taken along line III-III shown in FIG. FIG. 4 is a longitudinal sectional view of the ventral region A and the back region B of a pants-type disposable diaper according to another preferred embodiment of the present invention (corresponding to FIG. 3). FIG. 5 is a longitudinal sectional view of the ventral region A and the back region B of a pants-type disposable diaper according to another preferred embodiment of the present invention (corresponding to FIG. 3). FIG. 6 is a longitudinal sectional view of the ventral region A and the back region B of a pants-type disposable diaper according to still another preferred embodiment of the present invention (corresponding to FIG. 3). FIG. 7 is a longitudinal sectional view of the ventral region A and the dorsal region B of a pants-type disposable diaper according to still another preferred embodiment of the present invention (corresponding to FIG. 3). FIG. 8 is a partially broken plan view of the pants-type disposable diaper according to another preferred embodiment of the present invention, as viewed from the skin contact surface side in a state where the pants-type disposable diaper is expanded (FIG. 2 equivalent view).

Detailed Description of the Invention

The present inventor has found that skin troubles such as eczema, rash and rash are occurring not only on the back side but also on the ventral side when wearing disposable diapers. In addition, when an infant wears a disposable diaper, for example, the infant's body shape is raised on the abdomen and recessed on the back side, and the difference in unevenness of the uneven shape is large. For this reason, the present inventor believes that if the sweat-absorbing sheet portion disposed on the back side and the sweat-absorbing sheet portion disposed on the ventral side have the same specifications, the sweat-absorbing sheet portion that has absorbed sweat on the ventral side is likely to be in close contact with the skin. It has been found that the urine leakage can be easily increased, and leakage of urine is easily induced through the sweat-absorbing sheet portion.

Patent Document 1 describes that hydrophilic webs may be disposed on the dorsal end flap and the ventral end flap, respectively. However, Patent Document 1 does not describe anything about changing the specification of the hydrophilic web disposed on the dorsal end flap and the specification of the hydrophilic web disposed on the ventral end flap. In No. 1, there was room for improvement in order to more effectively prevent the occurrence of eczema, rash, rash and the like.

Similarly, Patent Document 2 discloses nothing about changing the specification of the sweat absorbing sheet disposed on the inner surface of the front waist area of the diaper and the specification of the sweat absorbing sheet disposed on the inner surface of the rear waist area of the diaper. Not listed. Like the disposable diaper described in Patent Document 2, if the specifications of the sweat absorbing sheet in the front waist area and the specifications of the sweat absorbing sheet in the rear waist area are the same, skin troubles are likely to increase on the ventral side. On the side, it is easy to induce urine leakage through the sweat-absorbing sheet.

Therefore, it is an object of the present invention to provide a disposable diaper that can eliminate the drawbacks of the above-described conventional technology.

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.
The disposable diaper of the present invention includes a ventral region A and a dorsal region B in the longitudinal direction X, and a crotch region C positioned between the A and B, and spans the ventral region A and the dorsal region B. And has an abdominal side waist flap FA and a back side waist flap FB which are located outward from the front and

rear end portions

23A and 23B in the longitudinal direction X of the absorbent body 23 and extend in the lateral direction Y. Yes. Here, the abdominal region A is a region disposed on the wearer's abdomen when wearing the disposable diaper, and the back region B is a region disposed on the wearer's back when wearing the disposable diaper. . The ventral waist flap FA is a region extending outward in the vertical direction X from the edge of the front end 23A on the ventral region A side in the vertical direction X of the absorber 23, and the absorber. 23 is a region obtained by combining the region extending in the horizontal direction Y from the front end 23A on the ventral region A side in the vertical direction X. Further, the back side waist flap FB is a region extending outward in the vertical direction X from the edge of the rear end portion 23B on the back side region B side in the vertical direction X of the absorber 23 and absorbing in the horizontal direction Y. It means a region that is combined with a region extending in the lateral direction Y from the rear end 23B of the body 23 in the longitudinal direction X on the back region B side.

1 and 2 show a pants-type disposable diaper 1 (hereinafter also referred to as “diaper 1”), which is an embodiment of the disposable diaper of the present invention. As shown in FIGS. 1 and 2, the diaper 1 includes an absorbent main body 2 and an exterior body 3 that is arranged on the non-skin-facing surface side of the absorbent main body 2 and fixes the absorbent main body 2. 3 includes an abdominal side waist flap FA and a back side waist flap FB which are located outward from the longitudinal front and

rear end portions

23A and 23B of the absorbent body 23 constituting the absorbent main body 2 and extend in the lateral direction Y. ing. The diaper 1 includes a pair of side seal portions S, S in which left and right side edges 3a1, 3a1 of the ventral region A of the exterior body 3 and left and right side edges 3b1, 3b1 of the back region B of the exterior body 3 are joined. A disposable diaper in which a waist opening WH and a pair of leg openings LH, LH are formed. Preferably, the outer body 3 of the diaper 1 is, as shown in FIG. 2, a plan view of the expanded and extended state, and a ventral region A disposed on the wearer's ventral side when worn, worn when worn. It is divided into a dorsal region B disposed on the back side of the person and a crotch region C between the ventral region A and the dorsal region B.

As shown in FIG. 2, the state where the diaper 1 is expanded and extended as described above refers to peeling the side seal portion S so that the diaper 1 is in an expanded state, and the expanded diaper 1 is replaced with an elastic member of each part. Is extended to the design dimension (same as the dimension when flattened in a state where the influence of the elastic member is completely eliminated).

In the present specification, the “skin facing surface” is a surface of the diaper 1 or a component thereof directed to the skin side of the wearer at the time of wearing, that is, the side relatively closer to the wearer's skin. The “skin-facing surface” is a surface of the diaper 1 or its constituent members that is directed to the side opposite to the wearer's skin side (clothing side), that is, the side relatively distant from the wearer's skin. In the diaper 1, the vertical direction (X direction) is a direction extending from the ventral region A to the dorsal region B in a state where the diaper 1 is expanded and extended on a plane. Moreover, the horizontal direction (Y direction) is a direction orthogonal to the vertical direction (X direction), and is the width direction of the diaper 1 in a state where the diaper 1 is expanded and extended on a plane.
Moreover, the diaper 1 is a left-right symmetric form with respect to the vertical centerline CL1 extended in a vertical direction (X direction) shown in FIG. 2 is a horizontal center line extending in the horizontal direction (Y direction) that bisects the diaper 1 in the vertical direction (X direction), and is orthogonal to the vertical center line CL1.

In the diaper 1, as shown in FIG. 2, the absorbent main body 2 has a vertically long shape in which the longitudinal direction (X direction) is relatively long in a state where the diaper 1 is expanded and stretched. The absorptive main body 2 includes a liquid-permeable surface sheet 21 that forms a skin-facing surface, a liquid-permeable surface sheet (including water repellency) that forms a non-skin-facing surface, and both of these

sheets

21 and 22. And a liquid-retaining absorbent 23 interposed therebetween. In the diaper 1, the absorbent body 23 is formed by covering an absorbent core 231 having absorbent performance with a liquid-permeable covering sheet 232, and the total length in the longitudinal direction (X direction) of the absorbent main body 2 is The position of the outer end edges 23A1, 23B1 of the front and

rear end portions

23A, 23B of the absorber 23 is the same as that of the absorbent body 23, as shown in FIG. It is in the same position as the position. Further, on both sides along the longitudinal direction (X direction) of the absorbent main body 2, as shown in FIG. 2, a leak-proof cuff 24 having an elastic member 25 arranged in an elongated state in the longitudinal direction (X direction), 24 is provided. Specifically, the leak-proof cuff 24 is made of a liquid-impermeable or water-repellent and breathable material, and in the vicinity of the free end of each leak-proof cuff 24, a leak-proof cuff forming elastic member. 25 is arranged in a state of extending in the vertical direction (X direction). When the diaper is worn, the free end portion side of the leak-proof cuff 24 rises due to the contraction of the leak-proof cuff forming elastic member 25, and the outflow of body fluid in the lateral direction (Y direction) is prevented.

As shown in FIG. 2, the absorbent main body 2 configured as described above has its longitudinal direction (X direction) aligned with the longitudinal direction (X direction) of the diaper 1 in the unfolded and extended state. It is joined to the center part of 3 by the main body fixing adhesive. As described above, the outer package 3 is arranged and bonded and fixed to 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. Therefore, in the diaper 1, the absorbent body 23 constituting the absorbent main body 2 is disposed across the ventral region A and the back region B.

In the diaper 1, as shown in FIGS. 2 and 3, a ventral waist flap FA and a back waist flap that extend outwardly from the front and rear end portions 23 A and 23 B in the longitudinal direction X of the absorber 23 and extend in the lateral direction Y. Each FB is formed with a stretchable region ST formed by an elastic member 71 arranged in a stretched state in the lateral direction (Y direction). Preferably, in the diaper 1, the exterior body 3 is a laminate of an outer layer sheet 6 that forms an outer surface of the diaper 1, that is, a non-skin facing surface when worn, and an inner layer sheet 5 that is disposed to face the skin facing surface of the outer layer sheet 6. Consists of the body. When the diaper 1 is worn, the outer layer sheet 6 is positioned on the side far from the wearer's skin to form a non-skin facing surface (outer surface) of the diaper 1, and the inner layer sheet 5 is more worn by the wearer than the outer layer sheet 6. The skin facing surface (inner surface) of the diaper 1 is formed on the side close to the skin. The outer layer sheet 6 and the inner layer sheet 5 are bonded to each other through a bonding means such as an adhesive, a heat seal, a high frequency seal, and an ultrasonic seal at a predetermined site. As shown in FIG. 2, the outer layer sheet 6 extends from the outer edge in the longitudinal direction X of the inner layer sheet 5 to the ventral region A and the back region B, and extends along the peripheral edge of the waist opening WH. 5 has a folded portion 6E that is folded back on the skin facing surface side, and the folded portion 6E has

longitudinal end portions

23A and 23B in the longitudinal direction X of the absorbent body 23, that is, longitudinal longitudinal ends of the absorbent main body 2. The part is covered. The folded portion 6E of the outer layer sheet 6 and the inner layer sheet 5 are bonded to each other at a predetermined portion via a bonding means such as an adhesive, a heat seal, a high frequency seal, and an ultrasonic seal.

As described above, in the diaper 1, as shown in FIG. 2, the exterior body 3 includes the outer layer sheet 6 on the non-skin facing surface side that forms the outer surface of the diaper 1, the folded portion 6E on the most skin facing surface side, and the outer layer sheet. 6 and an inner layer sheet 5 disposed between the folded portion 6E. In the diaper 1, the outer layer sheet 6 and the inner layer sheet 5 except for the folded portion 6E are bound inward toward the vertical center line CL1 in the central portion in the vertical direction (X direction), and are formed in the same shape and size. Yes. The folded portion 6E formed by the folded portion 6E of the outer layer sheet 6 is formed in a rectangular shape that is long in the lateral direction (Y direction). The folded portion 6E, the inner layer sheet 5 and the outer layer sheet 6 may be separate sheets, but in the diaper 1, the folded portion 6E is formed by the folded portion of the outer layer sheet 6. As described above, in the diaper 1, the ventral waist flap FA and the back waist flap FB have the folded portion 6 E and the inner layer sheet 5, respectively, and further, the outer layer sheet 6 is disposed on the non-skin facing surface side of the inner layer sheet 5. Have.

Moreover, in the diaper 1, the exterior body 3 is intermittently extended in the vertical direction (X direction) in the state extended in the horizontal direction (Y direction) between the inner layer sheet 5 and the outer layer sheet 6, as shown in FIG. A plurality of thread-like or belt-like elastic members 71 are provided. In the diaper 1, by providing a plurality of elastic members 71, a stretchable region ST having a waist stretchable portion G1 and a waistline lower stretchable portion G2 is formed. Moreover, in the diaper 1, between the inner layer sheet | seat 5 and the outer layer sheet | seat 6, as shown in FIG. 2, it has several thread-like or strip | belt-shaped leg elastic members 72 of the expanded state. In the diaper 1, the leg stretchable part G 3 is formed by including a plurality of leg elastic members 72. The leg expansion / contraction part G3 is formed in the peripheral part of the leg opening part LH, as shown in FIG.

In the diaper 1, the waist stretchable part G 1 is formed in the longitudinal direction (X direction) of the front and rear end parts 23 A and 23 B in the longitudinal direction (X direction) of the absorbent body 23 constituting the absorbent main body 2, as shown in FIG. 2. It is formed in the end flap located outside the outer end edges 23A1 and 23B1 in the longitudinal direction X (on the opposite side to the lateral center line CL2 side). Moreover, in the diaper 1, the waistline lower elastic part G2 is formed in the side flap located between the lower end of the side center line CL2 side of the waist elastic part G1 and the lower end of the side seal part S in the vertical direction (X direction). Has been. The above-described back-side waist flap FB and ventral-side waist flap FA are regions where the end flap (waist stretchable portion G1) is combined with a part of the side flap (trunk lower stretchable portion G2).

In the diaper 1, the exterior body 3 has a plurality of joints 8 for joining the inner layer sheet 5 and the outer layer sheet 6 as shown in FIG. In the diaper 1, the back side waist flap FB and the ventral side waist flap FA are formed by joining and fixing the inner layer sheet 5 and the outer layer sheet 6 at a plurality of joint portions 8 by heat fusion arranged in the form of dots. Has been. In the diaper 1, the joint portion 8 between the inner layer sheet 5 and the outer layer sheet 6 extends in the longitudinal direction (X direction) in the region extending from the waist stretchable part G1 to the waistline lower stretchable part G2 of each of the ventral region A and the dorsal region B. Are arranged intermittently so as to form a single row along the line, and a plurality of rows of joint portions 8L including the joint portions 8 are arranged at intervals in the lateral direction (Y direction).

As shown in FIG. 2, the diaper 1 is disposed between the inner layer sheet 5 and the outer layer sheet 6 fixed by the joint portion 8 in a state of extending in the lateral direction (Y direction) and in the longitudinal direction (X direction). And a plurality of elastic members 71 arranged intermittently. Preferably, in the diaper 1, a plurality of elastic members 71 are respectively provided in the plurality of joining portion rows 8 L in regions extending from the waist stretchable portion G 1 to the waistline lower stretchable portion G 2 of the ventral region A and the back region B, respectively. These are arranged in an extended state in the lateral direction (Y direction) through the gap between the joint portions 8.

In the diaper 1, as shown in FIG. 2, the inner layer sheet 5 and the side edges 3 a 1, 3 a 1 of the abdominal area A of the exterior body 3 and the side edges 3 b 1, 3 b 1 of the back area B of the exterior body 3 It has a pair of outer fixing regions 3T1 and 3T1 joined to the outer layer sheet 6 through an elastic member fixing adhesive, and in the vicinity of both side portions along the longitudinal direction (X direction) of the absorbent main body 2 In addition, the inner layer sheet 5 and the outer layer sheet 6 have a pair of main body side fixing regions 3T2 and 3T2 joined through an elastic member fixing adhesive.

In the waist elastic part G1 of the diaper 1, as shown in FIG. 2, a plurality of elastic members 71 are arranged between the pair of outer fixing regions 3T1, 3T1, and these elastic members 71 The outer fixed regions 3T1 and 3T1 are fixed between the inner layer sheet 5 and the outer layer sheet 6, respectively, while the pair of outer fixed regions 3T1 and 3T1 are fixed to both the inner layer sheet 5 and the outer layer sheet 6. It has not been.
Further, in the waistline lower stretchable part G2 of the diaper 1, as shown in FIG. 2, a plurality of elastic members 71 are disposed between the outer fixed region 3T1 and the main body side fixed region 3T2, The elastic member 71 is fixed between the inner layer sheet 5 and the outer layer sheet 6 in each of the outer fixed region 3T1 and the main body side fixed region 3T2, while between the outer fixed region 3T1 and the main body side fixed region 3T2. Is not fixed to any of the inner layer sheet 5 and the outer layer sheet 6. In the waistline lower stretchable part 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 fine so as not to exhibit elastic stretchability. It is arranged in a state where it has been processed such as being divided.

In addition, in the leg expansion-contraction part G3 of the diaper 1, as shown in FIG. 2, the some leg elastic member 72 distribute | arranged to the peripheral part of the leg opening part LH in the expansion | extension state is planar at the peripheral part of the leg opening part LH. It is being fixed between the inner layer sheet 5 and the outer layer sheet 6 through the elastic member fixing adhesive disposed on the inner surface.

In the outer casing 3 of the diaper 1, as shown in FIGS. 1 and 2, in the waist stretchable part G 1 and the waistline lower stretchable part G 2, the stretched state in the lateral direction (Y direction) between the inner layer sheet 5 and the outer layer sheet 6. The outer sheet 6 between the

joint rows

8L and 8L adjacent to each other in the lateral direction (Y direction) is removed by contraction of the plurality of elastic members 71 arranged in the vertical direction and intermittently arranged in the vertical direction (X direction). The folded portion 6E and the inner layer sheet 5 are deformed so as to swell inward to form a gather portion.

In the diaper 1, as shown in FIG. 2, a hydrophilic sweat absorbing sheet portion 4 capable of absorbing sweat is disposed in the stretchable region ST. In the diaper 1, the hydrophilic sweat-absorbent sheet portion 4 is disposed in the stretchable region ST of the abdominal waist flap FA, that is, in a region where a part of the waistline stretchable portion G2 is combined with the waist stretchable portion G1. Further, the sweat-absorbing sheet portion 4 is disposed in the stretchable region ST of the back waist flap FB, that is, a region where a part of the waistline lower stretchable portion G2 is combined with the waist stretchable portion G1.

In the diaper 1, as shown in FIG. 3, the hydrophilic sweat-absorbent sheet portion 4 is formed of the nonwoven fabric (the inner layer sheet 5, the outer layer sheet 6, and the folded portion 6E) that constitutes the abdominal waist flap FA and the back side waist flap FB. The inner layer sheet 5, which is a non-woven fabric closer to the wearer's skin than the elastic member 71, is formed by applying a hydrophilizing agent.

As the hydrophilizing agent, a known hydrophilizing agent used for absorbent articles such as disposable diapers can be used. In the diaper 1, the basis weight of the hydrophilizing agent applied to the inner layer sheet 5 is preferably the same amount on the abdominal side waist flap FA side and the back side waist flap FB side. It is preferable that the hydrophilicity of the part 4 and the hydrophilicity of the sweat absorbent sheet part 4 on the back waist flap FB side are the same. Here, that the contact angles are the same means that the difference in the contact angle values measured by the measurement method described later is within 5 °.

In the diaper 1, the hydrophilic sweat-absorbent sheet portion 4 is disposed over a region within the entire length in the lateral direction (Y direction) of the ventral waist flap FA as shown in FIG. 2 and as shown in FIG. 3. Further, the elastic member 71 is arranged closer to the wearer's skin. Similarly, as shown in FIG. 2, the hydrophilic sweat-absorbing sheet portion 4 is arranged over a region within the entire length in the lateral direction (Y direction) of the back waist flap FB, and as shown in FIG. 3. Further, the elastic member 71 is disposed closer to the wearer's skin. The hydrophilic sweat-absorbing sheet portion 4 is disposed "over the entire length region" means that the hydrophilic sweat-absorbing sheet portion 4 is in the lateral direction (Y direction) of the ventral waist flap FA and the back waist flap FB. ), The hydrophilic sweat-absorbing sheet portion 4 extends over a region shorter than the total length in the lateral direction (Y direction) of the ventral waist flap FA and the back waist flap FB. However, it is preferable that the absorber 23 is disposed over a region that is longer than the length of the absorber 23 in the lateral direction (Y direction). In the diaper 1, the hydrophilic sweat-absorbent sheet portion 4 is formed by the wearer more than the elastic member 71 that forms the abdominal waist flap FA and the dorsal waist flap FB in the abdominal waist flap FA and the dorsal waist flap FB, respectively. It is formed by applying a hydrophilizing agent over the entire length in the lateral direction (Y direction) of the inner layer sheet 5 close to the skin.

In the diaper 1, the sweat absorbing sheet portion 4 on the back region B side has a length (L2) in the longitudinal direction (X direction) that is the length of the sweat absorbing sheet portion 4 on the ventral region A side as shown in FIG. It is formed longer than the length (L1) in the direction (X direction). Ratio of the length (L2) in the longitudinal direction (X direction) of the sweat absorbing sheet portion 4 on the back side region B side to the length (L1) in the longitudinal direction (X direction) of the sweat absorbing sheet portion 4 on the ventral region A side ( L2 / L1) is preferably 2 or more from the viewpoint of absorbing a large amount of sweat on the wearer's back side while wearing and efficiently absorbing sweat on the abdomen side of the wearer. Is more preferable, and is preferably 20 or less, more preferably 12 or less, specifically 2 or more and 20 or less, and more preferably 3 or more and 18 or less.

Specifically, the length (L1) in the longitudinal direction (X direction) of the sweat absorbing sheet portion 4 on the ventral region A side is 3 mm or more from the viewpoint of efficiently absorbing sweat even on the wearer's ventral side when worn. It is preferably 5 mm or more, more preferably 30 mm or less, further preferably 20 mm or less, and specifically 3 mm or more and 30 mm or less, preferably 5 mm or more. More preferably, it is 20 mm or less.
The length (L2) in the longitudinal direction (X direction) of the sweat absorbing sheet portion 4 on the back side region B side is preferably 30 mm or more from the viewpoint of absorbing a large amount of sweat on the wearer's back side when worn, More preferably, it is 40 mm or more, preferably 100 mm or less, more preferably 80 mm or less, specifically preferably 30 mm or more and 100 mm or less, and 40 mm or more and 80 mm or less. Is more preferable.
The length (L1, L2) in the vertical direction (X direction) of the sweat-absorbent sheet portion 4 is the length in a state where the diaper 1 is expanded and extended.

In the diaper 1, the perspiration sheet portion 4 on the ventral region A side is an outer edge of the front end portion 23A on the ventral region A side in the longitudinal direction (X direction) of the absorbent body 23 as shown in FIGS. It is arranged only in a region sandwiched between the position of 23A1 and the position of the outer edge A1 in the vertical direction (X direction) of the ventral region A. In the diaper 1, the position of the outer edge A1 in the longitudinal direction (X direction) of the ventral region A means the position of the peripheral edge of the waist opening WH. In other words, in the diaper 1, the sweat-absorbing sheet portion 4 on the ventral region A side is positioned at the outer edge of the front end in the longitudinal direction X of the absorbent main body 2 and the peripheral edge of the waist opening WH in the ventral region A. It is arranged only in the area sandwiched between the positions. In the diaper 1, the sweat absorbent sheet portion 4 on the ventral region A side is outside the position of the outer end edge 23 A 1 of the front end portion 23 A on the ventral region A side in the longitudinal direction (X direction) of the absorber 23. In the ventral region A, it is arranged only in the inner region of the sandwiched region narrower than the sandwiched region, which is inward of the peripheral edge position of the waist opening WH.

In the diaper 1, the length (L2) in the longitudinal direction (X direction) of the sweat absorbing sheet portion 4 on the back region B side is the length in the longitudinal direction (X direction) of the sweat absorbing sheet portion 4 on the ventral region A side. Although longer than (L1), as in the sweat absorbent sheet portion 4 on the ventral region A side, as shown in FIGS. 2 and 3, the rear side of the back side region B in the longitudinal direction (X direction) of the absorber 23 It is arranged only in a region sandwiched between the position of the outer edge 23B1 of the end 23B and the position of the outer edge B1 in the vertical direction (X direction) of the back region B. In the diaper 1, the position of the outer edge B1 in the longitudinal direction (X direction) of the back region B means the position of the peripheral edge of the waist opening WH. In other words, in the diaper 1, the sweat-absorbing sheet portion 4 on the back region B side has the position of the outer edge of the rear end portion in the longitudinal direction X of the absorbent main body 2 and the peripheral edge portion of the waist opening WH in the back region B. It is arranged only in a region sandwiched between the positions of the peripheral edges. In the diaper 1, the sweat-absorbent sheet portion 4 on the back region B side is more outward than the position of the outer edge 23 B 1 of the rear end portion 23 B on the back region B side in the longitudinal direction (X direction) of the absorbent body 23. Thus, it is arranged only in the inner region of the sandwiched region narrower than the sandwiched region, which is inward of the position of the peripheral edge of the waist opening WH in the back side region B.

In the diaper 1, as shown in FIGS. 2 and 3, the inner edge in the vertical direction (X direction) of the sweat absorbent sheet portion 4 on the ventral region A side and the back region B side is longer than the leg opening LH. It is arranged outside the direction (X direction). In the diaper 1, the inner edge of the sweat-absorbent sheet part 4 means the edge in the longitudinal direction X closest to the crotch region C in the sweat-absorbent sheet part 4. As shown in FIG. 2, the inner end edge in the longitudinal direction (X direction) of the sweat absorbent sheet portion 4 on the ventral region A side is arranged on the outer side in the longitudinal direction (X direction) than the leg opening LH. In other words, the inner end edge in the longitudinal direction (X direction) of the sweat absorbing sheet portion 4 on the ventral region A side connects the inner end edges on the crotch region C side in the longitudinal direction X of the pair of side seal portions S, S. It is arranged on the outside in the vertical direction (X direction) from the imaginary line, that is, on the waist opening WH side, and on the waist opening WH side from the inner edge of the sweat absorbing sheet portion 4 on the back side region B side described later. It is arranged. Further, the inner end edge in the vertical direction (X direction) of the sweat absorbing sheet portion 4 on the back side region B side is an imaginary line connecting the inner end edges on the crotch region C side in the vertical direction X of the pair of side seal portions S, S. Rather than on the outside in the vertical direction (X direction), that is, on the side of the waist opening WH.

Moreover, in the diaper 1, as shown to FIG.2 and FIG.3, the position of the outer edge of the vertical direction (X direction) of the sweat absorbing sheet part 4 of the abdominal side area | region A side and the back side area | region B side is the sweat absorbing sheet part. 4 coincides with the position of the outer edge in the longitudinal direction (X direction) of the nonwoven fabric forming 4. In the diaper 1, the outer edge of the sweat-absorbing sheet part 4 means the edge in the vertical direction X closest to the peripheral edge of the waist opening WH in the sweat-absorbing sheet part 4. In the diaper 1, the nonwoven fabric forming the sweat absorbing sheet portion 4 is the inner layer sheet 5. The outer edge in the longitudinal direction (X direction) of the nonwoven fabric forming the sweat-absorbent sheet portion 4 means, in the diaper 1, the edge in the longitudinal direction X closest to the peripheral edge portion of the waist opening WH in the inner layer sheet 5. In the diaper 1, the sweat absorbent sheet portion 4 is formed on the inner layer sheet 5 constituting the ventral region A and the back region B, the position of the outer edge in the longitudinal direction X of the sweat absorbent sheet portion 4, and the inner layer sheet 5 The position of the outer edge in the vertical direction X coincides.
Here, “match” means the position of the outer edge in the longitudinal direction (X direction) of the sweat absorbent sheet portion 4 on the ventral region A side and the back region B side and the longitudinal direction of the nonwoven fabric forming the sweat absorbent sheet portion 4 ( It means that the difference from the position of the outer edge in the (X direction) is 5 mm or less. “Match” in this specification has the same meaning.

In the diaper 1, the stretchable region ST in which the sweat absorbing sheet portion 4 on the back region B side is arranged has a contraction stress (P2) in the lateral direction (Y direction), and the sweat absorbing sheet portion 4 on the ventral region A side. Is formed to be larger than the contraction stress (P1) in the lateral direction (Y direction) of the stretchable region ST. The lateral side of the stretchable region ST provided with the sweat absorbent sheet portion 4 on the back side region B against the contraction stress (P1) in the lateral direction (Y direction) of the stretchable region ST provided with the sweat absorbent sheet portion 4 on the ventral region A side. The ratio (P2 / P1) of the shrinkage stress (P2) in the direction (Y direction) absorbs a large amount of sweat corresponding to the dent on the back side of the wearer during wearing and wears the diaper 1 on the abdomen side of the wearer From the viewpoint of absorbing sweat efficiently without being marked, it is preferably 1.1 or more, more preferably 1.2 or more, and preferably 2.0 or less. More preferably, it is preferably 1.1 or more and 2.0 or less, and more preferably 1.2 or more and 1.9 or less.

More specifically, the shrinkage stress (P1) in the lateral direction (Y direction) of the stretchable region ST in which the perspiration-absorbing sheet portion 4 on the ventral region A side is arranged is determined by the wear trace of the diaper 1 on the wearer's ventral side when worn. From the viewpoint of absorbing sweat efficiently, it is preferably 0.005 N / mm or more, more preferably 0.0055 N / mm or more, and preferably 0.06 N / mm or less. 0.05 N / mm or less, more preferably 0.005 N / mm or more and 0.06 N / mm or less, and 0.0055 N / mm or more and 0.05 N / mm or less. More preferably it is.
The shrinkage stress (P2) in the lateral direction (Y direction) of the stretchable region ST in which the sweat absorbing sheet portion 4 on the back side region B side is arranged absorbs a large amount of sweat corresponding to the dent on the back side of the wearer when worn. In view of the above, it is preferably 0.0055 N / mm or more, more preferably 0.006 N / mm or more, and preferably 0.08 N / mm or less, and 0.06 N / mm or less. More preferably, it is preferably 0.0055 N / mm or more and 0.08 N / mm or less, and more preferably 0.006 N / mm or more and 0.06 N / mm or less.
The shrinkage stress (P1, P2) is measured by the following method.

<Measurement method of shrinkage stress (P1, P2)>
The diaper 1 described above will be described as an example. The side seal portion S of the diaper 1 is peeled off to place the diaper 1 in an expanded state, and the absorbent main body 2 is removed from the expanded diaper 1. Next, the measurement target site of the contraction stress is cut out as a measurement sample having a rectangular shape in plan view from the stretched exterior body 3 from which the absorbent main body 2 is removed. The measurement sample has a longitudinal direction (X direction) length (L1, L2) in the longitudinal direction (X direction) of the sweat absorbing sheet part 4 from the stretchable region ST in a state where the sweat absorbing sheet part 4 is arranged, and a horizontal direction. A region whose length in the direction (Y direction) is the entire length in the lateral direction (Y direction) of the waist flap is cut out. With respect to the cut out measurement sample, the length in the vertical direction (X direction) corresponding to the diaper 1 and the length in the horizontal direction (Y direction) between the side seals S and S are measured in advance. The measurement sample whose length is measured is placed between chucks of a tensile tester (for example, “RTA-100” manufactured by Orientec Co., Ltd.) so that the transverse direction (Y direction) of the measurement sample matches the tensile direction. Fix it. The distance between the chucks is 100 mm. The measurement sample fixed between the chucks is equivalent to 80 (for example, 280 mm) when the length in the lateral direction (Y direction) between the side seals S and S is 100 (for example, 350 mm) at a speed of 300 mm / min. The tensile load (N) when contracted to a length equivalent to 71 (for example, 250 mm) after being stretched to a length of is taken as the stress of each region. A value obtained by dividing the obtained stress (N) by the length in the longitudinal direction (X direction) measured in advance is defined as the contraction stress (N / mm) of the measurement sample.

The formation material of each part of the diaper 1 mentioned above is demonstrated.
In the diaper 1, since the folded portion 6E constituting the outer package 3 is formed by the folded portion 6E of the outer layer sheet 6, the entire outer layer sheet 6 including the folded portion 6E (folded portion 6E) is composed of hydrophobic fibers. Formed of a hydrophobic sheet. In the diaper 1, the inner layer sheet 5 separate from the outer layer sheet 6 is also composed of a hydrophobic sheet.

Examples of the hydrophobic fiber constituting the hydrophobic sheet used for the outer layer sheet 6 (including the folded portion 6E) and the inner layer sheet 5 include thermoplastic synthetic fibers, and specifically, as the constituent fibers of various nonwoven fabrics. For example, polyolefin fibers such as polyethylene (PE) fibers and polypropylene (PP) fibers; fibers using a thermoplastic resin such as polyethylene terephthalate (PET) and polyamide alone; Examples of the composite fiber include a sheath type and a side-by-side type structure.

The hydrophilizing agent that forms the hydrophilic sweat-absorbing sheet portion 4 is not particularly limited as long as it is a general hydrophilizing agent used for hygiene products. Whether the fibers constituting the sweat-absorbent sheet portion 4 are hydrophilic or hydrophobic is determined based on the contact angles of the constituent fibers measured by [Method for measuring the contact angle of fibers] described below. Specifically, if the contact angle is 90 ° or more, it is determined that the hydrophilicity is low, and if the contact angle is less than 90 °, it is determined that the hydrophilicity is high.

[Measurement method of fiber contact angle]
For the measurement of the contact angle, for example, a contact angle meter MCA-J manufactured by Kyowa Interface Science Co., Ltd. is used. Specifically, after the ion-exchanged water is dropped (about 20 picoliters) on the surface of the fibers constituting the sweat-absorbing sheet portion 4, the contact angle is measured immediately using the contact angle meter. The measurement is performed at five or more locations of the fibers constituting the sweat-absorbent sheet portion 4, and the average value thereof is taken as the contact angle. The measurement environment temperature is 20 ° C.

As the top sheet 21, the back sheet 22, the absorber 23, the leak-proof cuff 24, etc. constituting the absorbent main body 2, various kinds of materials conventionally used for absorbent articles such as disposable diapers are used without particular limitation. Can do. For example, as the surface sheet 21, a single layer or multilayer nonwoven fabric, a perforated film, or the like can be used. 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, those composed of absorbent polymer particles and fiber materials can be used, and as the covering sheet 232 of the absorbent body 23, tissue paper, nonwoven fabric, or the like can be used. . Moreover, as the leak-proof cuff 24, a water-repellent single layer or multilayer nonwoven fabric or the like can be used.

Examples of the elastic member (the leakage preventing cuff forming elastic member 25, the elastic member 71, the leg elastic member 72, etc.) include synthetic rubber such as styrene-butadiene, butadiene, isoprene, neoprene, natural rubber, EVA, stretchable polyolefin, A polyurethane etc. can be mentioned. As the form of the elastic member, a thread-like (thread rubber etc.) having a cross section of a rectangle, a square, a circle, an ellipse, a polygon or the like, or a string-like (flat rubber etc.) can be preferably used.

Elastic member fixing adhesive for fixing elastic members (such as the leakage preventing cuff forming elastic member 25, the elastic member 71, the leg elastic member 72, etc.), and the main body fixing adhesive for fixing the exterior body 3, the absorbent main body 2 and the like For example, various hot melt adhesives conventionally used for absorbent articles such as disposable diapers can be used without particular limitation.

The effect at the time of using the diaper 1 of one Embodiment of this invention mentioned above is demonstrated.
In the diaper 1, as shown in FIGS. 2 and 3, a hydrophilic sweat absorbent sheet portion 4 capable of absorbing sweat is disposed in the stretchable region ST of the abdominal waist flap FA and the stretchable region ST of the back side waist flap FB. ing. Therefore, it can be expected that skin troubles such as eczema, sweat rash and rash are reduced on the wearer's abdomen and dorsal side when the diaper 1 is worn. Moreover, in the diaper 1, as shown in FIG. 3, the sweat absorbing sheet portion 4 on the back region B side has a length (L2) in the longitudinal direction (X direction), and the sweat absorbing sheet portion 4 on the ventral region A side. Is longer than the length (L1) in the vertical direction (X direction). Therefore, with regard to the body shape of the wearer, even if it is the body shape of an infant whose flank protrudes and the back side is recessed and the unevenness of the uneven shape is large, a large amount of sweat on the wearer's recessed back side when wearing Can absorb sweat, and on the abdomen side where the wearer protrudes, the adhesion range of the sweat absorbing sheet part 4 that absorbs sweat is narrow, and it is difficult to increase skin troubles, and furthermore, it is difficult to induce urine leakage through the sweat absorbing sheet part 4 . And the expansion / contraction area | region ST in which the sweat absorbing sheet part 4 of the back side area | region B was arrange | positioned has the contraction stress (P2) of the horizontal direction (Y direction), and the sweat absorbing sheet part 4 by the side of the ventral area A was arranged. It is formed larger than the contraction stress (P1) in the lateral direction (Y direction) of the stretchable region ST. Therefore, a large amount of sweat can be absorbed corresponding to the dent on the back side of the wearer when worn, and the sweat of the diaper 1 can be absorbed efficiently on the abdomen side where the wearer protrudes.

In particular, in the diaper 1, as shown in FIGS. 2 and 3, the sweat absorbing sheet portion 4 on the ventral region A side is outside the front end portion 23 A on the ventral region A side in the longitudinal direction (X direction) of the absorbent body 23. It is arranged only in a region sandwiched between the position of the end edge 23A1 and the outer end edge A1 in the vertical direction (X direction) of the ventral region A. Thus, since the sweat-absorbent sheet portion 4 on the ventral region A side is not arranged on the front end portion 23A in the longitudinal direction (X direction) of the absorbent body 23, it is difficult to increase skin troubles, and the diaper 1 is worn. It is hard to stick.

Moreover, in the diaper 1, as shown in FIG.2 and FIG.3, in the ventral | abdominal area | region A side and the back | dorsal area | region B side, the sweat absorption sheet | seat part 4 has the inner edge of the crotch area | region C side from leg opening LH. Is also arranged on the outer side in the vertical direction (X direction), and the position of the outer edge thereof coincides with the position of the outer edge of the inner layer sheet 5 forming the sweat-absorbent sheet portion 4. If the sweat-absorbing sheet portion 4 is arranged at such a position, excretion of excrement from the crotch is difficult to occur.

As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to embodiment mentioned above, It can change suitably.
For example, in the diaper 1 described above, the folded portion 6E constituting the exterior body 3 is formed by the folded portion 6E of one outer layer sheet 6 as shown in FIG. The hydrophobic sheet (nonwoven fabric) may be used. FIG. 4 shows a diaper 1 on which a separate hydrophobic sheet 9 is arranged. In the diaper 1 shown in FIG. 4, a hydrophobic sheet 9 is arranged at a distance from the peripheral edge of the waist opening WH instead of the folded portion 6E.

In the diaper 1 shown in FIGS. 4 and 5, in the ventral region A, the hydrophobic sheet 9 is formed on the outer end edge 23 A 1 of the front end 23 A on the ventral region A side in the longitudinal direction (X direction) of the absorbent body 23. It is arranged across. Moreover, in the back side area | region B, the hydrophobic sheet | seat 9 is distribute | arranged ranging over the outer end edge 23B1 of the rear-end part 23B of the back side area | region B side of the longitudinal direction (X direction) of the absorber 23. FIG. In the diaper 1 shown in FIG. 4, the position of the outer edge in the longitudinal direction (X direction) of the sweat absorbing sheet portion 4 on the ventral region A side and the outer edge A1 in the longitudinal direction (X direction) of the ventral region A. The position matches. And the position of the outer end edge in the vertical direction (X direction) of the sweat absorbing sheet portion 4 on the back side region B side coincides with the position of the outer end edge B1 in the vertical direction (X direction) of the back side region B. Yes. In other words, in the diaper 1 shown in FIG. 4, the sweat-absorbing sheet portion 4 formed on the inner layer sheet 5 disposed closer to the wearer's skin than the elastic member 71 is replaced by the elastic member 71 in the diaper 1 shown in FIG. The sweat absorbing sheet portion 4 formed on the folded portion 6E of the outer layer sheet 6 arranged on the side close to the wearer's skin is formed inward in the vertical direction (X direction) from the peripheral edge of the waist opening WH. The length (L2) in the longitudinal direction (X direction) of the sweat absorbing sheet portion 4 on the back side region B side is the length (L1) in the longitudinal direction (X direction) of the sweat absorbing sheet portion 4 on the ventral region A side. ) Is formed longer. Thus, the position of the outer edge in the vertical direction (X direction) of the sweat-absorbent sheet portion 4 matches the position of the outer edge in the vertical direction (X direction) of each of the ventral region A and the back region B. If it is, the sweat flowing down from the stomach and back can be absorbed, and the effect that it is hard to accumulate in a diaper is produced. In the diaper 1 shown in FIG. 4, the sweat absorbing sheet portion 4 has an inner edge on the crotch region C side in the longitudinal direction (X direction) than the leg opening LH on the ventral region A side and the back region B side. ) It is arranged on the outer side, and the position of the outer edge thereof coincides with the position of the outer edge of the inner layer sheet 5 that forms the sweat-absorbent sheet portion 4. In the diaper 1 shown in FIG. 5, the sweat absorbing sheet portion 4 has an inner edge on the crotch region C side in the longitudinal direction (X direction) than the leg opening LH in the ventral region A side and the back region B side. It arrange | positions on the outer side and the position of the outer end edge corresponds with the position of the outer end edge of the folding | turning part 6E of the outer layer sheet | seat 6 which forms the sweat absorption sheet | seat part 4. FIG. For this reason, the above-described effects are exhibited.

Moreover, in the diaper 1, as shown in FIG. 3, the hydrophilic sweat-absorbing sheet portion 4 is a non-woven fabric (inner layer sheet 5, outer layer sheet 6 and folded portion 6E) constituting the abdominal side waist flap FA and the back side waist flap FB. Among them, a hydrophilizing agent is applied to the inner layer sheet 5, which is a non-woven fabric closer to the wearer's skin than the elastic member 71, but as shown in FIGS. 5 and 7, The folded portion 6E may be formed by applying a hydrophilizing agent, and as shown in FIG. 6, the inner layer sheet 5, the outer layer sheet 6 and the folded portion are closer to the wearer's skin than the elastic member 71. A hydrophilic sweat-absorbing sheet portion 4B that is separate from 6E may be provided.

In the diaper 1 shown in FIG.5 and FIG.7, the folding | returning part 6E of the outer layer sheet | seat 6 in which the sweat absorption sheet | seat part 4 of the ventral | abdominal area A side is formed has the inner edge of the vertical direction (X direction) as an absorber The outer end edge 23A1 of the front end 23A on the ventral region A side in the vertical direction (X direction) 23 is arranged outward in the vertical direction (X direction). Then, a hydrophobic sheet 9 separate from the outer layer sheet 6 is separated from the folded portion 6E to the crotch region C side, and the front end portion 23A on the ventral region A side in the longitudinal direction (X direction) of the absorbent body 23. Is arranged across the outer edge 23A1. Moreover, in the diaper 1 shown in FIG.5 and FIG.7, the folding | returning part 6E of the outer layer sheet | seat 6 in which the sweat absorption sheet | seat part 4 of the back side area | region B side is formed covers the whole hydrophobic sheet | seat 9 of another body. It is arranged in. And the hydrophobic sheet | seat 9 is distribute | arranged ranging over the outer end edge 23B1 of the rear-end part 23B of the back side area | region B side of the vertical direction (X direction) of the absorber 23. FIG. As described above, in the diaper 1 shown in FIGS. 5 and 7, the sweat absorbing

sheet portions

4 and 4B do not overlap the separate hydrophobic sheet 9 at the peripheral edge of the waist opening WH. Sweat easily evaporates.

In the diaper 1 shown in FIGS. 5, 6, and 7, as in the diaper 1 shown in FIG. 3, the sweat-absorbing

sheet portions

4 and 4 B on the ventral region A side are It is disposed only in a region sandwiched between the position of the outer end edge 23A1 of the front end 23A on the side region A side and the outer end edge of the ventral region A in the vertical direction (X direction). On the other hand, in the diaper 1 shown in FIGS. 5, 6, and 7, the sweat absorbing

sheet portions

4 and 4 B on the back side region B side have a length (L2) in the longitudinal direction (X direction) on the ventral region A side. Longer than the length (L1) in the longitudinal direction (X direction) of the sweat-

absorbent sheet portions

4 and 4B, than the outer end edge 23B1 of the rear end portion 23B on the back side region B side in the longitudinal direction (X direction) of the absorbent body 23. Is also arranged in a region sandwiched between the position on the crotch region C side and the outer end edge in the longitudinal direction (X direction) of the back side region B, and the outer end edge 23B1 on the back side region B side of the absorber 23 It is arranged across. Thus, when the sweat absorbing

sheet portions

4 and 4B on the back side region B side are disposed across the outer edge 23B1 on the back side region B side of the absorbent body 23, the back side where the wearer is depressed at the time of wearing. Thus, a large amount of sweat can be absorbed, and the absorbed sweat can be moved to the absorber 23, and skin troubles on the back side of the wearer can be expected to be reduced.

In particular, in the diaper 1 shown in FIGS. 6 and 7, the position of the outer edge in the longitudinal direction (X direction) of the sweat-absorbent sheet portion 4 is the longitudinal direction (X direction) of the ventral region A on the ventral region A side. Is not coincident with the position of the outer edge A1, and is spaced from the position of the outer edge A1 in the longitudinal direction (X direction) of the ventral region A toward the crotch region C. Similarly to the ventral region A side, on the back region B side, the position of the outer edge in the vertical direction (X direction) of the sweat absorbent sheet portion 4 is the outer edge in the vertical direction (X direction) of the back region B. It does not coincide with the position of B1, and is spaced from the position of the outer edge B1 in the longitudinal direction (X direction) of the back region B toward the crotch region C. With such a configuration, there is an effect that the perspired sweat hardly permeates into the clothes.

Moreover, in the disposable diaper 1 mentioned above, the hydrophilic sweat-absorbent sheet part 4 is distribute | arranged over the full length of the horizontal direction (Y direction) of the abdominal side waist flap FA, and the horizontal direction of the back side waist flap FB similarly. Although it distribute | arranges over the full length of (Y direction), the hydrophilic sweat-absorbing sheet | seat part 4 should just be distribute | arranged over the area | region within the full length of the horizontal direction (Y direction) of ventral side waist flap FA. Similarly, the hydrophilic sweat-absorbent sheet portion 4 only needs to be disposed over a region within the entire length in the lateral direction (Y direction) of the back waist flap FB. For example, as in the diaper 1 shown in FIG. 8, in the lateral direction (Y direction) of the diaper 1, both inner end edges Se on the longitudinal center line CL 1 side in the fusion part where the sweat-absorbing sheet portion 4 constitutes the side seal portion S. , Se is included in the lateral (Y direction) inward. In this case, when the side end portion of the sweat absorbing sheet portion 4 is separated from the inner end edge Se of the side seal portion S by 20 mm or less respectively, that is, the side end portion of the sweat absorbing sheet portion 4 and the inner end edge of the side seal portion S. The case where the distance d to Se is 20 mm or less is included.
Moreover, in the diaper 1 shown in FIG. 8, in the aspect which the both-sides edge part of the sweat-absorbing sheet | seat part 4 is spaced apart from the side seal part S, the horizontal direction (Y direction) length L4 of the back side waist flap FB and the ventral side waist flap The lateral direction (Y direction) length L3 of FA is substantially the same. Here, “substantially match” is a case where the difference between the lateral direction (Y direction) length L4 of the back side waist flap FB and the lateral direction (Y direction) length L3 of the ventral side waist flap FA is 10 mm or less. .

The absorbent article of the present invention is not limited to the diaper 1 shown in FIGS. 3 to 8 described above, and can be changed as appropriate. Further, the constituent elements in the diaper 1 of FIGS. 3 to 8 described above can be implemented in appropriate combination within a range that does not impair the gist of the present invention.

Moreover, in the disposable diaper 1 mentioned above, as shown in FIG.2 and FIG.3, the exterior body 3 was distribute | arranged intermittently to the vertical direction (X direction) in the state extended in the horizontal direction (Y direction). Although it has the thread-like or belt-like elastic member 71, the form of the elastic member 71 may be a film shape or an elastic fiber layer made of elastic fibers in addition to the thread-like or belt-like shape.

Moreover, in the disposable diaper 1 mentioned above, as shown in FIG. 2, the exterior body 3 is a pants-type disposable diaper having a continuous shape such as an hourglass shape extending over the ventral region A, the crotch region C, and the dorsal region B. The exterior body 3 may be a split-type pants-type disposable diaper that is divided as a separate member into a ventral-side exterior body, a back-side exterior body, and a crotch exterior body.

Moreover, in the disposable diaper 1 mentioned above, as shown in FIG. 1, although it is a pants-type disposable diaper which has the exterior body 3, it may be a deployment-type disposable diaper.

The following disposable diapers are further disclosed regarding the embodiment described above.

<1>
A ventral region and a dorsal region in the vertical direction, and a crotch region positioned between them, and has an absorber over the ventral region and the dorsal region, and the longitudinal direction of the absorber A disposable diaper having a ventral side waist flap and a back side waist flap that are located outward from the front and rear ends and extend in the lateral direction,
Each of the ventral waist flap and the dorsal waist flap has a stretchable region formed by an elastic member arranged in a stretched state in the lateral direction, and the stretchable region has a hydrophilic sweat absorption capable of absorbing sweat. The seat part is arranged,
The sweat-absorbing sheet portion is disposed over a region within the total lateral length of the ventral waist flap and a region within the lateral total length of the dorsal waist flap, and the skin of the wearer than the elastic member. It is arranged on the side close to
The length of the sweat absorbing sheet portion on the back side region side is longer than the length of the sweat absorbing sheet portion on the ventral region side,
The expansion / contraction region in which the sweat absorbing sheet portion on the back region side is disposed has a lateral contraction stress, and the contraction stress in the lateral direction of the expansion region in which the sweat absorbing sheet portion on the ventral region side is disposed. Larger than disposable diapers.

<2>
The sweat absorbing sheet portion on the ventral region side is sandwiched between the position of the outer edge on the ventral region side in the longitudinal direction of the absorber and the position of the outer edge in the longitudinal direction of the ventral region The disposable diaper according to <1>, which is arranged only in
<3>
The ratio (L2 / L1) of the longitudinal length (L2) of the sweat absorbing sheet portion on the dorsal region side to the longitudinal length (L1) of the sweat absorbing sheet portion on the ventral region side is 2 or more The disposable diaper according to <1> or <2>, wherein
<4>
Lateral contraction stress of the stretch region in which the sweat absorbing sheet portion on the back side region is disposed with respect to the contraction stress (P1) in the lateral direction of the stretch region in which the sweat absorbent sheet portion on the ventral region side is disposed The disposable diaper according to any one of <1> to <3>, wherein the ratio (P2 / P1) of (P2) is 1.1 or more and 2 or less.
<5>
The sweat-absorbent sheet portion on the back side region side is located on the crotch region side with respect to the outer end edge on the back side region side in the longitudinal direction of the absorber and the position of the outer edge in the longitudinal direction of the back side region. The region according to any one of the above <1> to <4>, which is disposed in a region sandwiched between and disposed across the position of the outer edge on the back region side of the absorber. Disposable diapers.
<6>
The left and right side edges of the ventral region and the left and right side edges of the back region are joined to form a pair of side seals, a waist opening and a pair of leg openings,
The hydrophilic sweat-absorbent sheet portion is in a region within the total length in the lateral direction of the nonwoven fabric closer to the wearer's skin than the elastic member, of the nonwoven fabric constituting the ventral waist flap and the back waist flap. It is formed by applying a hydrophilizing agent,
The position of the inner edge in the vertical direction of the sweat absorbing sheet portion on the ventral region side and the back region side is arranged on the outer side in the vertical direction than the leg opening,
The position of the outer edge in the longitudinal direction of the sweat absorbent sheet portion on the ventral region side and the dorsal region side coincides with the position of the outer edge in the longitudinal direction of the nonwoven fabric forming the sweat absorbent sheet portion, The disposable diaper according to any one of <1> to <5>.
<7>
The position of the outer edge in the vertical direction of the sweat-absorbing sheet portion on the ventral region side coincides with the position of the outer edge in the vertical direction of the ventral region,
<1> to <6>, wherein the position of the outer edge in the vertical direction of the sweat-absorbing sheet portion on the back side region side and the position of the outer edge in the vertical direction of the back side region coincide with each other The disposable diaper as described in any one.
<8>
The position of the outer edge in the longitudinal direction of the sweat absorbing sheet portion on the ventral region side does not coincide with the position of the outer edge in the longitudinal direction of the ventral region, and the position of the outer side in the longitudinal direction of the ventral region is Away from the position of the edge,
The position of the outer edge in the vertical direction of the sweat absorbing sheet portion on the back side region side does not coincide with the position of the outer edge in the vertical direction of the back side region. The disposable diaper according to any one of <1> to <6>, wherein the disposable diaper is separated from a position of an edge.

<9>
The hydrophilic sweat-absorbent sheet portion is formed by applying a hydrophilizing agent to a nonwoven fabric closer to the wearer's skin than the elastic member among the nonwoven fabrics constituting the ventral waist flap and the back waist flap. The disposable diaper according to any one of the above items <1> to <8>.
<10>
Any one of the above items <1> to <9>, wherein the degree of hydrophilicity of the sweat absorbing sheet portion on the ventral waist flap side and the degree of hydrophilicity of the sweat absorbing sheet portion on the back waist flap side are the same Disposable diapers described in 1.
<11>
The ratio (L2 / L1) of the longitudinal length (L2) of the sweat absorbing sheet portion on the dorsal region side to the longitudinal length (L1) of the sweat absorbing sheet portion on the ventral region side is 2 or more The disposable diaper according to any one of <1> to <10>, preferably 3 or more and 20 or less, preferably 12 or less.
<12>
The length (L1) in the longitudinal direction of the sweat absorbing sheet portion on the ventral region side is 3 mm or more, preferably 5 mm or more, and 30 mm or less, preferably 20 mm or less, <1> to <11 > The disposable diaper as described in any one of>.
<13>
The length (L2) in the longitudinal direction of the sweat absorbing sheet portion on the back side region side is 30 mm or more, preferably 40 mm or more, and 100 mm or less, preferably 80 mm or less, <1> to <12 > The disposable diaper as described in any one of>.
<14>
Lateral contraction stress of the stretch region in which the sweat absorbing sheet portion on the back side region is disposed with respect to the contraction stress (P1) in the lateral direction of the stretch region in which the sweat absorbent sheet portion on the ventral region side is disposed The ratio (P2 / P1) of (P2) is 1.1 or more, preferably 1.2 or more, and is 2.0 or less, preferably 1.9 or less, <1> to <13> The disposable diaper as described in any one of these.
<15>
The contraction stress (P1) in the lateral direction of the stretchable region in which the sweat absorbing sheet portion on the ventral region side is disposed is 0.005 N / mm or more, preferably 0.0055 N / mm or more, and The disposable diaper according to any one of <1> to <14>, which is 06 N / mm or less, preferably 0.05 N / mm or less.

<16>
The shrinkage stress (P2) in the lateral direction of the stretchable region in which the sweat absorbing sheet portion on the back side region side is disposed is 0.0055 N / mm or more, preferably 0.006 N / mm or more, and The disposable diaper according to any one of <1> to <15>, which is 08 N / mm or less, preferably 0.06 N / mm or less.
<17>
The disposable diaper has an exterior body,
<1> to <16>, wherein the exterior body includes a laminate of an outer layer sheet forming a non-skin facing surface and an inner layer sheet disposed to face the skin facing surface of the outer layer sheet. The disposable diaper as described in any one of these.
<18>
The outer layer sheet extends from the longitudinal outer edge of the inner layer sheet to the ventral region and the dorsal region, and is folded back to the skin facing surface side of the inner layer sheet along the peripheral edge of the waist opening. The disposable diaper according to <17>, further including a folded portion that covers the longitudinal front and rear end portions of the absorbent body.
<19>
The entire outer layer sheet including the folded portion is formed of a hydrophobic sheet composed of hydrophobic fibers,
The disposable diaper according to <18>, wherein the inner layer sheet separate from the outer layer sheet is also composed of a hydrophobic sheet.
<20>
The exterior body includes a plurality of thread-like or belt-like elastic members arranged intermittently in the longitudinal direction in a state of being stretched in the lateral direction between the inner layer sheet and the outer layer sheet. The disposable diaper according to any one of 17> to <19>.
<21>
The absorptive sheet portion on the ventral region side is formed by applying a hydrophilizing agent to the folded portion on the ventral region side, and the outer end on the ventral region side in the longitudinal direction of the absorbent body It is arranged only in the region sandwiched between the position of the edge and the position of the outer edge in the longitudinal direction of the ventral region,
A hydrophobic sheet separate from the sweat-absorbing sheet portion on the ventral region side is disposed across the outer edge of the front end portion on the ventral region side in the longitudinal direction of the absorber,
The sweat absorbing sheet portion on the back side region side is formed by applying a hydrophilizing agent to the folded portion on the back side region side, and the outer end on the back side region side in the longitudinal direction of the absorbent body It is arranged in a region sandwiched between a position on the crotch region side from the edge and a position of the outer end edge in the longitudinal direction of the dorsal region, and is located at the position of the outer end edge on the dorsal region side of the absorber. It is arranged across,
A hydrophobic sheet separate from the sweat absorbing sheet portion on the back side region side is provided between the sweat absorbing sheet portion on the back side region side and the outer edge of the absorber on the back side region side. The disposable diaper according to any one of <17> to <20>, wherein the disposable diaper is disposed across an outer end edge of a rear end portion on the dorsal region side in the longitudinal direction of the absorbent body.

<22>
On the ventral region side, the folded portion on the ventral region side is arranged across the position of the outer edge on the ventral region side of the absorber,
On the side closer to the wearer's skin than the folded portion on the ventral region side, the hydrophilic sweat-absorbent sheet portion separate from the folded portion on the ventral region side is the ventral region of the absorber. It is arranged across the position of the outer edge of the side,
On the dorsal region side, the folded portion on the dorsal region side is disposed across the position of the outer edge on the dorsal region side of the absorber,
On the side closer to the wearer's skin than the folded portion on the back side region side, a hydrophilic sweat-absorbent sheet portion separate from the folded portion on the back side region side is the longitudinal direction of the absorber. <17> to <20> described above, which are arranged in a region sandwiched between a position on the crotch region side with respect to the outer end edge on the back side region side and a position of the outer end edge in the vertical direction of the back side region The disposable diaper as described in any one.
<23>
The back side waist flap and the ventral side waist flap are formed by bonding and fixing the inner layer sheet and the outer layer sheet at a plurality of joint portions by heat fusion arranged in the form of dots. The disposable diaper according to any one of <17> to <22>.
<24>
The extension region has a waist elastic part and a waistline lower elastic part,
In the region extending from the waist stretchable portion to the waistline lower stretchable portion of each of the ventral region and the dorsal region, the joining portions of the inner layer sheet and the outer layer sheet form a line along the vertical direction. The disposable diaper according to the above <23>, wherein the disposable diapers are arranged intermittently, and a plurality of rows of the joint portions including the joint portions are arranged at intervals in the lateral direction.
<25>
Between the inner layer sheet and the outer layer sheet fixed at the joint portion, the elastic sheet has a plurality of elastic members arranged in a laterally extended state and intermittently arranged in the vertical direction, The disposable diaper as described in 23> or <24>.
<26>
The extension region has a waist elastic part and a waistline lower elastic part,
In the region extending from the waist stretchable portion of each of the ventral region and the dorsal region to the waistline lower stretchable portion, a plurality of the elastic members are respectively disposed between the joint portions of the plurality of joint portion rows. The disposable diaper according to <25>, wherein the disposable diaper is disposed in an extended state in a lateral direction through a gap.
<27>
A pair of the inner layer sheet and the outer layer sheet joined to both side edges of the ventral region of the exterior body and both side edges of the back region of the exterior body via an elastic member fixing adhesive. The disposable diaper according to any one of <17> to <26>, which has an outer fixing region.

According to the present invention, it can be expected that skin troubles such as eczema, sweats and rashes are reduced on the abdomen and dorsal side of the wearer when worn.

Claims

A ventral region and a dorsal region in the vertical direction, and a crotch region positioned between them, and has an absorber over the ventral region and the dorsal region, and the longitudinal direction of the absorber A disposable diaper having a ventral side waist flap and a back side waist flap that are located outward from the front and rear ends and extend in the lateral direction,
Each of the ventral waist flap and the dorsal waist flap has a stretchable region formed by an elastic member arranged in a stretched state in the lateral direction, and the stretchable region has a hydrophilic sweat absorption capable of absorbing sweat. The seat part is arranged,
The sweat-absorbing sheet portion is disposed over a region within the total lateral length of the ventral waist flap and a region within the lateral total length of the dorsal waist flap, and the skin of the wearer than the elastic member. It is arranged on the side close to
The length of the sweat absorbing sheet portion on the back side region side is longer than the length of the sweat absorbing sheet portion on the ventral region side,
The expansion / contraction region in which the sweat absorbing sheet portion on the back region side is disposed has a lateral contraction stress, and the contraction stress in the lateral direction of the expansion region in which the sweat absorbing sheet portion on the ventral region side is disposed. Larger than disposable diapers.
The sweat absorbing sheet portion on the ventral region side is sandwiched between the position of the outer edge on the ventral region side in the longitudinal direction of the absorber and the position of the outer edge in the longitudinal direction of the ventral region The disposable diaper according to claim 1, wherein the disposable diaper is disposed only on the diaper.
The ratio (L2 / L1) of the longitudinal length (L2) of the sweat absorbing sheet portion on the dorsal region side to the longitudinal length (L1) of the sweat absorbing sheet portion on the ventral region side is 2 or more The disposable diaper according to claim 1 or 2, wherein
Lateral contraction stress of the stretch region in which the sweat absorbing sheet portion on the back side region is disposed with respect to the contraction stress (P1) in the lateral direction of the stretch region in which the sweat absorbent sheet portion on the ventral region side is disposed The disposable diaper according to any one of claims 1 to 3, wherein a ratio (P2 / P1) of (P2) is 1.1 or more and 2 or less.
The sweat-absorbent sheet portion on the back side region side is located on the crotch region side with respect to the outer end edge on the back side region side in the longitudinal direction of the absorber and the position of the outer edge in the longitudinal direction of the back side region. The disposable diaper according to any one of claims 1 to 4, wherein the disposable diaper is disposed in a region sandwiched between the outer side edges of the absorbent body so as to straddle the position of the outer edge on the back region side.
The left and right side edges of the ventral region and the left and right side edges of the back region are joined to form a pair of side seals, a waist opening and a pair of leg openings,
The hydrophilic sweat-absorbent sheet portion is in a region within the total length in the lateral direction of the nonwoven fabric closer to the wearer's skin than the elastic member, of the nonwoven fabric constituting the ventral waist flap and the back waist flap. It is formed by applying a hydrophilizing agent,
The position of the inner edge in the vertical direction of the sweat absorbing sheet portion on the ventral region side and the back region side is arranged on the outer side in the vertical direction than the leg opening,
The position of the outer edge in the longitudinal direction of the sweat absorbent sheet portion on the ventral region side and the dorsal region side coincides with the position of the outer edge in the longitudinal direction of the nonwoven fabric forming the sweat absorbent sheet portion, The disposable diaper according to any one of claims 1 to 5.
The position of the outer edge in the vertical direction of the sweat-absorbing sheet portion on the ventral region side coincides with the position of the outer edge in the vertical direction of the ventral region,
The position of the outer edge in the vertical direction of the sweat absorbing sheet portion on the back side region side coincides with the position of the outer edge in the vertical direction of the back side region. The disposable diaper described in the item.
The position of the outer edge in the longitudinal direction of the sweat absorbing sheet portion on the ventral region side does not coincide with the position of the outer edge in the longitudinal direction of the ventral region, and the position of the outer side in the longitudinal direction of the ventral region is Away from the position of the edge,
The position of the outer edge in the vertical direction of the sweat absorbing sheet portion on the back side region side does not coincide with the position of the outer edge in the vertical direction of the back side region. The disposable diaper according to any one of claims 1 to 6, wherein the disposable diaper is spaced from an edge position.
The hydrophilic sweat-absorbent sheet portion is formed by applying a hydrophilizing agent to a nonwoven fabric closer to the wearer's skin than the elastic member among the nonwoven fabrics constituting the ventral waist flap and the back waist flap. The disposable diaper according to any one of claims 1 to 8, wherein
The disposable type according to any one of claims 1 to 9, wherein the degree of hydrophilicity of the sweat absorbing sheet portion on the ventral waist flap side and the hydrophilicity of the sweat absorbing sheet portion on the back waist flap side are the same. Diapers.
The ratio (L2 / L1) of the longitudinal length (L2) of the sweat absorbing sheet portion on the dorsal region side to the longitudinal length (L1) of the sweat absorbing sheet portion on the ventral region side is 2 or more The disposable diaper according to any one of claims 1 to 10, which is 20 or less.
The disposable diaper according to any one of claims 1 to 11, wherein a length (L1) in a vertical direction of the sweat absorbing sheet portion on the ventral region side is 3 mm or more and 30 mm or less.
The disposable diaper according to any one of claims 1 to 12, wherein a length (L2) in a vertical direction of the sweat absorbing sheet portion on the back side region side is 30 mm or more and 100 mm or less.
Lateral contraction stress of the stretch region in which the sweat absorbing sheet portion on the back side region is disposed with respect to the contraction stress (P1) in the lateral direction of the stretch region in which the sweat absorbent sheet portion on the ventral region side is disposed The disposable diaper according to any one of claims 1 to 13, wherein a ratio (P2 / P1) of (P2) is 1.2 or more and 1.9 or less.
The shrinkage stress (P1) in the lateral direction of the stretchable region where the sweat absorbing sheet portion on the ventral region side is disposed is 0.005 N / mm or more and 0.06 N / mm or less. The disposable diaper of Claim 1.
The shrinkage stress (P2) in the lateral direction of the stretchable region where the sweat absorbing sheet portion on the back side region side is disposed is 0.0055 N / mm or more and 0.08 N / mm or less. The disposable diaper of Claim 1.
The disposable diaper has an exterior body,
The exterior body includes a laminate of an outer layer sheet that forms a non-skin facing surface and an inner layer sheet that is disposed to face the skin facing surface of the outer layer sheet. The disposable diaper according to item 1.
The outer layer sheet extends from the longitudinal outer edge of the inner layer sheet to the ventral region and the dorsal region, and is folded back to the skin facing surface side of the inner layer sheet along the peripheral edge of the waist opening. The disposable diaper according to claim 17, further comprising a folded portion that covers the longitudinal front and rear end portions of the absorbent body.
The entire outer layer sheet including the folded portion is formed of a hydrophobic sheet composed of hydrophobic fibers,
The disposable diaper according to claim 18, wherein the inner layer sheet separate from the outer layer sheet is also composed of a hydrophobic sheet.
The exterior body has a plurality of thread-like or belt-like elastic members that are intermittently arranged in the longitudinal direction between the inner layer sheet and the outer layer sheet in a state of extending in the lateral direction. The disposable diaper according to any one of 17 to 19.
The absorptive sheet portion on the ventral region side is formed by applying a hydrophilizing agent to the folded portion on the ventral region side, and the outer end on the ventral region side in the longitudinal direction of the absorbent body It is arranged only in the region sandwiched between the position of the edge and the position of the outer edge in the longitudinal direction of the ventral region,
A hydrophobic sheet separate from the sweat-absorbing sheet portion on the ventral region side is disposed across the outer edge of the front end portion on the ventral region side in the longitudinal direction of the absorber,
The sweat absorbing sheet portion on the back side region side is formed by applying a hydrophilizing agent to the folded portion on the back side region side, and the outer end on the back side region side in the longitudinal direction of the absorbent body It is arranged in a region sandwiched between a position on the crotch region side from the edge and a position of the outer end edge in the longitudinal direction of the dorsal region, and is located at the position of the outer end edge on the dorsal region side of the absorber. It is arranged across,
A hydrophobic sheet separate from the sweat absorbing sheet portion on the back side region side is provided between the sweat absorbing sheet portion on the back side region side and the outer edge of the absorber on the back side region side. The disposable diaper according to any one of claims 17 to 20, wherein the disposable diaper is disposed across an outer end edge of a rear end portion on the back side region side in the longitudinal direction of the absorbent body.
On the ventral region side, the folded portion on the ventral region side is arranged across the position of the outer edge on the ventral region side of the absorber,
On the side closer to the wearer's skin than the folded portion on the ventral region side, the hydrophilic sweat-absorbent sheet portion separate from the folded portion on the ventral region side is the ventral region of the absorber. It is arranged across the position of the outer edge of the side,
On the dorsal region side, the folded portion on the dorsal region side is disposed across the position of the outer edge on the dorsal region side of the absorber,
On the side closer to the wearer's skin than the folded portion on the back side region side, a hydrophilic sweat-absorbent sheet portion separate from the folded portion on the back side region side is the longitudinal direction of the absorber. 21. The device according to any one of claims 17 to 20, which is disposed in a region sandwiched between a position closer to the crotch region than an outer end edge on the back side region side and a position of the outer end edge in the longitudinal direction of the back side region. The disposable diaper described in the item.
The dorsal waist flap and the ventral waist flap are formed by bonding and fixing the inner layer sheet and the outer layer sheet at a plurality of heat-bonded joints arranged in a dotted pattern. Item 22. The disposable diaper according to any one of Items 17 to 22.
The extension region has a waist elastic part and a waistline lower elastic part,
In the region extending from the waist stretchable portion to the waistline lower stretchable portion of each of the ventral region and the dorsal region, the joining portions of the inner layer sheet and the outer layer sheet form a line along the vertical direction. The disposable diaper according to claim 23, wherein the disposable diapers are arranged intermittently, and a plurality of rows of the joint portions including the joint portions are arranged at intervals in the lateral direction.
Between the inner layer sheet and the outer layer sheet fixed at the joint portion, there are a plurality of elastic members that are arranged in a laterally extended state and intermittently arranged in the vertical direction. The disposable diaper according to 23 or 24.
The extension region has a waist elastic part and a waistline lower elastic part,
In the region extending from the waist stretchable portion of each of the ventral region and the dorsal region to the waistline lower stretchable portion, a plurality of the elastic members are respectively disposed between the joint portions of the plurality of joint portion rows. The disposable diaper according to claim 25, wherein the disposable diaper is arranged in an extended state in a lateral direction through the gap.
A pair of the inner layer sheet and the outer layer sheet joined to both side edges of the ventral region of the exterior body and both side edges of the back region of the exterior body via an elastic member fixing adhesive. The disposable diaper according to any one of claims 17 to 26, wherein the disposable diaper has an outer fixing region.