JP2017113186A - Disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disposable diaper capable of reducing skin trouble such as the eczema, sudamina, and rash by quickly transferring absorbed perspiration to a surface not facing a skin and preventing the perspiration from returning to the skin.SOLUTION: A disposable diaper 1 according to the present invention includes abdominal-side waist flaps FA and back-side waist flaps FB. Each back-side waist flap FB includes an outer layer sheet 4, an inner layer sheet 6, and a joining part 8 for joining the outer layer sheet 4 and the inner layer sheet 6. The outer layer sheet 4 has a hydrophilic property, while the inner layer sheet 6 has a hydrophobic property. At a peripheral part 8R of the joining part 8, hydrophobic fibers 61 constituting the inner layer sheet 6 enter gaps between hydrophilic fibers 41 constituting the outer layer sheet 4, and the hydrophilic fibers 41 constituting the outer layer sheet 4 enter gaps between the hydrophobic fibers 61 constituting the inner layer sheet 6. Further, the hydrophilic fibers 41 constituting the outer layer sheet 4 reach a skin-facing surface of the inner layer sheet 6.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a disposable diaper.

  In the disposable diaper, an exterior body is disposed on the outside of a vertically long absorbent main body provided with an absorber. When a hydrophobic nonwoven fabric is used for the sheet constituting the exterior body, it is difficult to absorb sweat. Therefore, a technique for improving the sweat absorption of sweat by using a hydrophilic nonwoven fabric on the side in contact with the skin has been proposed ( For example, Patent Literature 1 to Patent Literature 4).

  Patent Document 1 includes a sweat-absorbing sheet having a first surface layer, a second surface layer opposite to the first surface layer, and an intermediate layer therebetween, wherein each of the first surface layer and the second surface layer is a hydrophobic fiber. Disposable diapers are disclosed that are formed by mixing water and hydrophilic fibers, and the intermediate layer is formed of hydrophilic fibers.

  Further, Patent Document 2 includes a sweat-absorbing sheet comprising an inner layer on the side in contact with the skin and an outer layer on the opposite side, and the inner layer is formed by mixing hydrophobic fibers and hydrophilic fibers, and the outer layer is formed. , Disposable diapers formed containing 50 to 100% by weight of hydrophilic fibers are disclosed.

  Patent Document 3 discloses a disposable diaper in which a hydrophilic sheet having an inner hydrophilic sheet and an outer hydrophilic sheet disposed on the non-skin contact surface side is disposed on a waist flap.

  Further, in Patent Document 4, the inner hydrophobic sheet of the side flap and the outer hydrophilic sheet disposed on the non-skin-side contact surface are fixed by a heat-sealing part, and the heat-sealing part is a fiber. Disposable diapers that are composite sheets that maintain their form are disclosed.

  According to the disposable diapers described in Patent Literatures 1 to 4, sweat during wearing can be absorbed. In particular, according to the disposable diaper described in Patent Document 3, sweat diffusibility is improved, and according to the disposable diaper described in Patent Document 4, absorbed sweat is likely to evaporate and there is an uncomfortable feeling during use. Absent.

JP 2007-301346 A JP 2001-327534 A JP 2010-246901 A Japanese Laid-Open Patent Publication No. 2003-96450

  However, since the so-called sweat-absorbent sheet provided in the disposable diapers described in Patent Documents 1 to 3 is a sheet in which all the constituent sheets are mixed with hydrophilic fibers, the constituent sheet that absorbs sweat is the skin of the wearer. There is room for further improvement because skin troubles such as eczema, sweats and rashes cannot be prevented.

  In addition, the so-called composite sheet provided in the disposable diaper described in Patent Document 4 is difficult to produce a heat-sealed part that maintains a fiber structure that absorbs liquid while the skin side is a hydrophobic sheet, and is industrially stable. It was difficult to produce.

  Therefore, this invention is providing the underpants type disposable diaper which can eliminate the fault which the prior art mentioned above has.

  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 A disposable diaper having an abdominal waist flap and a back waist flap extending laterally and extending outwardly from the longitudinal front and rear ends, respectively, wherein at least the back waist flap is located on the skin facing surface side The inner layer sheet and the outer layer sheet positioned on the non-skin facing surface side are joined by a plurality of joints arranged in a dispersed manner, and the inner layer sheet is a hydrophobic nonwoven fabric composed of hydrophobic fibers, The outer layer sheet is a hydrophilic non-woven fabric composed of hydrophilic fibers, and the hydrophobic fibers constituting the inner layer sheet in the gap between the hydrophilic fibers constituting the outer layer sheet at the periphery of the joint portion. Enters The hydrophilic fibers constituting the outer layer sheet enter the gaps between the hydrophobic fibers constituting the inner layer sheet, and the hydrophilic fibers constituting the outer layer sheet reach the skin facing surface of the inner layer sheet. It is intended to provide disposable diapers.

  According to the present invention, absorbed sweat can be quickly transferred to the non-skin facing surface side, and skin troubles such as eczema, rash, and rash can be reduced by eliminating the return of sweat to the skin.

FIG. 1 is a perspective view of a pants-type disposable diaper that is an embodiment of the present invention. FIG. 2 is a developed plan view of the state in which the diaper shown in FIG. 1 is developed 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 an enlarged cross-sectional view showing a cross section along the horizontal direction (Y direction) of the waist stretchable part in the diaper shown in FIG. 1. FIG. 5: is an expanded sectional view which shows the cross section of the part containing the junction part in the exterior body of the diaper of another embodiment (FIG. 3 equivalent view). FIG. 6 is an enlarged cross-sectional view showing a cross section of a portion including a joint portion in a diaper outer package of still another embodiment (corresponding to FIG. 3).

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 disposed on the non-skin contact surface side of the absorbent main body 2 and fixes the absorbent main body 2. The body 3 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, 23B in the longitudinal direction X of the absorbent body 23 constituting the absorbent main body 2 and extend in the lateral direction Y. doing. 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 WO and a pair of leg openings LO, LO are formed. Preferably, the exterior body 3 of the diaper 1 is a plan view of the expanded and extended state shown in FIG. 2, and includes a ventral region A disposed on the abdomen side of the wearer when worn, It is divided into a dorsal region B arranged on the dorsal side 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 constituent member thereof (for example, the absorbent main body 2) that is directed toward the wearer's skin when worn, and the “non-skin facing surface” is In the diaper 1 or its constituent members, the surface is directed to the side opposite to the wearer's skin side (clothing side) when worn. 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. In addition, CL2 in FIG. 2 is a horizontal center line extending in the horizontal direction (Y direction) that bisects the diaper 1, and is orthogonal to the vertical center line CL1.

  In the diaper 1, the absorptive 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 unfolded and extended as shown in FIG. 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. Moreover, as shown in FIG. 2, the leakproof cuffs 24 and 24 which have the elastic member arrange | positioned in the extending | stretching state in the vertical direction (X direction) in the both sides along the vertical direction (X direction) of the absorptive main body 2 are shown. 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.

  The exterior body 3 has an abdominal side waist flap FA and a back side waist flap FB that are located outward from the front and rear end portions 23A and 23B in the longitudinal direction X of the absorber 23 and extend in the lateral direction Y. In the diaper 1, as shown in FIGS. 2 and 3, not only the back waist flap FB but also the abdomen waist flap FA is an inner layer sheet 6 positioned on the skin facing surface side and an outer layer positioned on the non-skin facing surface side. The sheet 4 is formed by being joined by a plurality of joints 8 arranged in a distributed manner. Moreover, in the diaper 1, the skin side sheet | seat 5 is distribute | arranged to the skin opposing surface side of the inner layer sheet | seat 6 of the back side waist flap FB and the abdominal side waist flap FA.

  Preferably, in the diaper 1, as shown in FIGS. 2 and 3, the exterior body 3 includes an outer layer sheet 4 on the non-skin facing surface side that forms the outer surface of the diaper 1, a skin side sheet 5 on the most skin facing surface side, It has an inner layer sheet 6 arranged between the outer layer sheet 4 and the skin side sheet 5. In the diaper 1, the sheet material constituting the outer layer sheet 4 in each of the ventral region A and the dorsal region B is folded back to the skin facing surface side of the inner layer sheet 6 along the peripheral edge of the waist opening WO. The folded portion 4R covers the front and rear end portions 23A and 23B in the longitudinal direction (X direction) of the absorbent body 23 constituting the absorbent main body 2. The outer layer sheet 4, the skin side sheet 5, and the inner layer sheet 6 may be separate sheets, but in the diaper 1, the skin side sheet 5 is formed by the folded portion 4 </ b> R of the outer layer sheet 4. In the diaper 1, the outer layer sheet 4 and the inner layer sheet 6 excluding the folded portion 4R are bound inward toward the longitudinal center line CL1 in the longitudinal direction (X direction) central portion as shown in FIG. It is formed in the same size. The skin side sheet 5 formed by the folded portion 4R of the outer layer sheet 4 is formed in a rectangular shape that is long in the lateral direction (Y direction).

  In the diaper 1, the exterior body 3 extends in the longitudinal direction (Y direction) between the outer layer sheet 4 and the inner layer sheet 6 or between the skin side sheet 5 and the inner layer sheet 6 in the longitudinal direction (Y direction). (X direction) has a plurality of elastic members 71 arranged intermittently. In the embodiment shown in FIG. 2, a plurality of elastic members 71 are provided between the outer layer sheet 4 and the inner layer sheet 6. . In the diaper 1, by providing a plurality of elastic members 71, a waist elastic part G1 and a waistline lower elastic part G2 are formed. Moreover, in the diaper 1, it has the some leg elastic member 72 of the expanded state between the outer layer sheet | seat 4 and the inner layer sheet | seat 6, as shown in FIG. In the diaper 1, the leg stretchable part G <b> 3 is formed by including a plurality of leg elastic members 72.

  In the diaper 1, the waist stretchable part G <b> 1 is formed in the longitudinal direction (X direction) of the front and rear end parts 23 </ b> A and 23 </ b> 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 on an end flap that is located outward in the longitudinal direction X from the edge (on the side opposite 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 part G1) is combined with a part of the side flap (trunk lower stretchable part G2). Moreover, in the diaper 1, the leg expansion-contraction part G3 is formed in the peripheral part of the leg opening part LO, as shown in FIG.

  As shown in FIG. 2, the exterior body 3 has a plurality of joint portions 8 that join the outer layer sheet 4 and the inner layer sheet 6 in the diaper 1. In the diaper 1, the back-side waist flap FB and the ventral-side waist flap FA are formed by joining and fixing the outer layer sheet 4 and the inner layer sheet 6 at a plurality of joint portions 8 by heat fusion arranged in the form of dots. Has been.

  Preferably, in the diaper 1, as shown in FIG. 2, the outer layer sheet 4 and the inner layer sheet 6 are heated in regions extending from the waist stretchable portion G1 to the waistline lower stretchable portion G2 of each of the ventral region A and the backside region B. The welded joints 8 are intermittently arranged in a row along the vertical direction (X direction), and the joint row 8L including the plurality of joints 8 is in the lateral direction (Y direction). Multiple rows are arranged at intervals.

  The joining portion 8 is formed by superposing the outer layer sheet 4 and the inner layer sheet 6 and melting and solidifying the superposed portion by applying heat embossing. As a heat embossing apparatus, an embossing roll and an anvil roll are provided, and what has the convex part of the shape corresponding to the junction part 8 can be used for the outer peripheral surface of the embossing roll. As a process for forming the joint portion 8, an ultrasonic seal, a laser, or the like can be employed instead of the heat embossing process.

In the diaper 1, the interval between the joints 8 and 8 adjacent to each other in the longitudinal direction (X direction) constituting the joint row 8L extending in the longitudinal direction (X direction) is 1 mm or more from the viewpoint of improving sweat diffusibility. Preferably, it is 3 mm or more, more preferably 20 mm or less, more preferably 18 mm or less, specifically more preferably 1 mm or more and 20 mm or less. More preferably, it is 18 mm or less.
In addition, the distance between the joint rows 8L and 8L adjacent in the lateral direction (Y direction) is preferably 4 mm or more, more preferably 6 mm or more, from the viewpoint of improving the evaporation of absorbed sweat. And it is preferable that it is 20 mm or less, it is more preferable that it is 16 mm or less, specifically, it is more preferable that it is 4 mm or more and 20 mm or less, and it is more preferable that it is 6 mm or more and 16 mm or less.

  In the diaper 1, as shown in FIG. 2, a plurality of elastic members 71 are joined to the regions extending from the waist stretchable part G <b> 1 to the waistline lower stretchable part G <b> 2 of the ventral region A and the dorsal region B, respectively. The partial rows 8L are arranged in an extended state in the lateral direction (Y direction) through the gaps between the joint portions 8 of the partial rows 8L. As described above, in the diaper 1, the elastic member 71 is disposed between the outer layer sheet 4 and the inner layer sheet 6 fixed by the joint portion 8.

  Further, in the diaper 1, as shown in FIG. 2, the outer layer sheet 4 and the both side edges 3 a 1, 3 a 1 of the ventral region A of the exterior body 3 and the side edges 3 b 1, 3 b 1 of the back region B of the exterior body 3 It has a pair of outer fixing regions 3T1 and 3T1 joined to the inner layer sheet 6 through an elastic member fixing adhesive, and also in the vicinity of both side portions along the longitudinal direction (X direction) of the absorbent main body 2 In addition, the outer layer sheet 4 and the inner layer sheet 6 have a pair of main body side fixing regions 3T2 and 3T2 joined via an elastic member fixing adhesive.

In the waist stretchable part G1 of the diaper 1, a plurality of elastic members 71 are arranged between the pair of outer fixing regions 3T1, 3T1, and these elastic members 71 are respectively a pair of outer fixing regions 3T1, 3T1. In FIG. 5, the outer layer sheet 4 and the inner layer sheet 6 are fixed to each other, while the pair of outer fixing regions 3T1 and 3T1 are not fixed to either the outer layer sheet 4 or the inner layer sheet 6.
Moreover, in the waist part lower expansion-contraction part G2 of the diaper 1, the several elastic member 71 is distribute | arranged between the outer side fixed area | region 3T1 and the main body side fixing area | region 3T2, and these elastic members 71 are outer side fixed. In each of the region 3T1 and the main body side fixing region 3T2, it is fixed between the outer layer sheet 4 and the inner layer sheet 6, while between the outer side fixing region 3T1 and the main body side fixing region 3T2, the outer layer sheet 4 and It is not fixed to any of the inner layer sheets 6. In the waistline lower stretchable part G2 of the diaper 1, the elastic member 71 is not arranged between the pair of main body side fixing regions 3T2 and 3T2, or the elastic member 71 is finely divided so as not to exhibit elastic stretchability. It is arranged in a state that has been subjected to processing such as.

  In addition, in the leg expansion-contraction part G3 of the diaper 1, the some elastic member 72 distribute | arranged to the peripheral part of the leg opening part LO in the expanded state is fixed to the elastic member fixed to the peripheral part of the leg opening part LO. It is being fixed between the outer layer sheet 4 and the inner layer sheet 6 through the adhesive agent.

  Moreover, as shown in FIG. 3, the skin-side sheet 5 and the inner layer sheet 6 are fixed to the exterior body 3 of the diaper 1 with an adhesive 9. In the diaper 1, the adhesive 9 is not disposed on the joint 8 and the peripheral portion 8 </ b> R of the joint 8. Preferably, in the diaper 1, the adhesive 9 is disposed on the skin facing surface of the inner layer sheet 6 or the non-skin facing surface of the skin side sheet 5 excluding the joint portion 8 and the peripheral portion 8R of the joint portion 8. The skin side sheet 5 and the inner layer sheet 6 are fixed via an adhesive 9. Here, the peripheral portion 8R of the joint portion 8 indicates a region between the outer peripheral edge that is the outline of the joint portion 8 and a position that is 0.5 mm away from the outer peripheral edge.

  In the outer casing 3 of the diaper 1, the waist stretchable part G1 and the waistline lower stretchable part G2 are arranged in an extended state in the lateral direction (Y direction) between the outer layer sheet 4 and the inner layer sheet 6 as shown in FIG. When the elastic member 71 contracts, the outer layer sheet 4 between the joint rows 8L and 8L adjacent in the lateral direction (Y direction) is deformed so as to bulge outward, and the adhesive 9 is interposed therebetween. The fixed skin side sheet 5 and the inner layer sheet 6 are deformed so as to swell outward. And between adjacent joint part row | line | columns 8L and 8L, while the collar 3F which consists of the outer layer sheet 4 or the skin side sheet 5 and the inner layer sheet 6 arises, between the outer layer sheet 4, the skin side sheet 5 and the inner layer sheet 6 A hollow portion 3H surrounded by the flange 3F and the flange 3F is formed between them.

  In the diaper 1, the outer layer sheet 4 constituting the outer package 3 is a hydrophilic nonwoven fabric composed of hydrophilic fibers, and the inner layer sheet 6 is a hydrophobic nonwoven fabric composed of hydrophobic fibers. As described above, in the diaper 1, since the skin side sheet 5 is formed by the folded portion 4R of the outer layer sheet 4, the entire outer layer sheet 4 including the folded portion 4R (skin side sheet 5) is a hydrophilic nonwoven fabric. The inner layer sheet 6 is formed of a hydrophobic nonwoven fabric and is separate from the outer layer sheet 4.

  Examples of the hydrophilic fibers constituting the hydrophilic nonwoven fabric used for the outer layer sheet 4 (including the skin side sheet 5) include those obtained by hydrophilizing synthetic fibers. Specifically, hydrophobic synthetic fibers are hydrophilized. And those obtained by kneading a hydrophilizing agent into the fiber during the production of the hydrophobic synthetic fiber. In addition, a composite nonwoven fabric in which fibers having inherent hydrophilicity, for example, natural or semi-natural fibers are mixed with synthetic fibers can also be used. The synthetic fiber is not particularly limited, but is a polyolefin fiber such as polyethylene (PE) fiber or polypropylene (PP) fiber; a fiber made of a thermoplastic resin such as polyethylene terephthalate (PET) or polyamide; a core-sheath type And a composite fiber having a side-by-side structure. The hydrophilizing agent used for hydrophilizing the synthetic fiber is not particularly limited as long as it is a general hydrophilizing agent used for hygiene products. Specific examples of the hydrophilic fiber include natural cellulose fibers such as non-wood pulp such as wood pulp, cotton pulp, and straw pulp; and regenerated cellulose fibers such as rayon and cupra.

  Examples of the hydrophobic fibers constituting the hydrophobic nonwoven fabric used for the inner layer sheet 6 include synthetic fibers. Specifically, those that are usually used as constituent fibers of various nonwoven fabrics can be used. For example, polyethylene (PE) fiber, polyolefin fiber such as polypropylene (PP) fiber, etc .; fiber made of a thermoplastic resin such as polyethylene terephthalate (PET) or polyamide alone; composite fiber having a structure such as a core-sheath type or side-by-side type .

  The determination of whether the sheet is hydrophilic or hydrophobic is made based on the contact angle of the constituent fibers measured by the following [Measurement Method of Contact Angle]. Specifically, if the contact angle is 90 degrees or more, it is determined that the hydrophilicity is low, and if the contact angle is smaller than 90 degrees, it is determined that the hydrophilicity is high.

  As shown in FIG. 3, in the peripheral portion 8 </ b> R of the joint portion 8, the hydrophobic fibers 61 constituting the inner layer sheet 6 enter the gaps between the hydrophilic fibers 41 constituting the outer layer sheet 4 to form the inner layer sheet 6. The hydrophilic fibers constituting the outer layer sheet 4 are inserted into the gaps between the hydrophobic fibers 61. Preferably, in the peripheral portion 8 </ b> R of the joint portion 8 of the diaper 1, the hydrophobic fibers 61 constituting the inner layer sheet 6 enter the gaps between the hydrophilic fibers 41 constituting the outer layer sheet 4 to constitute the inner layer sheet 6. Hydrophilic fibers 51 constituting the outer layer sheet 4 enter the gaps between the hydrophobic fibers 61. More preferably, in the peripheral portion 8R of the joint portion 8 of the diaper 1, the hydrophilic fibers 41 constituting the outer layer sheet 4 are formed in the gaps between the hydrophobic fibers 61 constituting the inner layer sheet 6 as shown in FIG. The hydrophilic fibers 41 constituting the outer layer sheet 4 and the hydrophilic fibers 51 constituting the skin side sheet 5 are in contact with each other. Here, the fiber has entered, as shown in FIG. 3, for example, the hydrophobic fibers 61 constituting the inner layer sheet 6 located below (on the skin facing surface side) of the outer layer sheet 4. It means that it has the part extended above (non-skin opposing surface side) beyond the hydrophilic fiber 41 which comprises the outer layer sheet | seat 4. As shown in FIG. Further, the hydrophilic fibers 41 constituting the outer layer sheet 4 located above the inner layer sheet 6 (on the non-skin facing surface side) extend below the hydrophobic fibers 61 constituting the inner layer sheet 6 (on the skin facing surface side). ) Means a portion extending.

  And in the surrounding part 8R of the junction part 8, the hydrophilic fiber 41 which comprises the outer layer sheet | seat 4 has reached the skin opposing surface of the inner layer sheet | seat 6, as shown in FIG. Preferably, in the diaper 1, as described above, the skin-side sheet 5 is arranged on the skin-facing surface side of the inner layer sheet 6, so that the hydrophilic portion constituting the outer layer sheet 4 is formed in the peripheral portion 8 </ b> R of the joint 8. Fiber 41 and hydrophilic fiber 51 constituting skin side sheet 5 are in contact with each other. Here, that the hydrophilic fiber 41 and the hydrophilic fiber 51 are in contact means that the hydrophilic fiber 41 and the hydrophilic fiber 51 are at least in contact with each other.

  Moreover, in the junction part 8 of the diaper 1, as shown in FIG. 3, the hydrophilic fiber 41 which comprises the outer layer sheet 4, and the hydrophobic fiber 61 which comprises the inner layer sheet 6 are pressed, and it forms into a film, The hydrophilic fibers 41 constituting the sheet 4 and the hydrophobic fibers 61 constituting the inner layer sheet 6 are fixed by thermal fusion. And in the junction part 8 of the diaper 1, it has the part which the hydrophilic fiber 51 which comprises the skin side sheet | seat 5 located under the inner layer sheet | seat 6 (skin opposing surface side) touches the junction part 8, and is contacting. .

The formation material of each part of the diaper 1 mentioned above is demonstrated.
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 body 23, an absorbent core made of absorbent polymer particles and a fiber material and covered with tissue paper 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 elastic member 25 for forming a leakproof cuff, 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.

  Adhesive 9, elastic member fixing elastic member (elastic member 25 for forming leakproof cuff, elastic member 71, leg elastic member 72, etc.), and main body for fixing exterior body 3 and absorbent main body 2 and the like As the fixing adhesive, 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.
As shown in FIGS. 2 and 3, the diaper 1 includes the inner layer sheet 6 in the gap between the hydrophilic fibers 41 constituting the outer layer sheet 4 in the peripheral portion 8R of the joint portion 8 at least in the back side waist flap FB. Hydrophobic fibers 61 constituting the outer layer sheet 4 enter the gaps between the hydrophobic fibers 61 constituting the inner layer sheet 6 and the hydrophilic fibers 41 constituting the outer layer sheet 4 enter. The fiber 41 reaches the skin facing surface of the inner layer sheet 6. Therefore, the hydrophilic outer layer sheet on the non-skin facing surface side is formed by the hydrophilic fibers 41 constituting the outer layer sheet 4 in which the wearer's sweat reaches the skin facing surface of the inner layer sheet 6 during wearing of the diaper 1. It is easy to shift to 4. And since the sweat of the wearer who transferred to the outer layer sheet 4 is separated by the hydrophobic inner layer sheet 6, it is difficult to return to the hydrophilic skin side sheet 5 and the skin again. Thus, since the sweat of the wearer who has moved to the outer layer sheet 4 on the non-skin facing surface side is difficult to touch the skin, skin troubles such as eczema, rash and rash can be reduced.

  Moreover, in the diaper 1, as shown in FIG. 3, the hydrophilic skin side sheet | seat comprised by the hydrophilic fiber 51 on the skin opposing surface side of the inner layer sheet | seat 6 of the back side waist flap FB and the abdominal side waist flap FA. 5 is arranged. And in the peripheral part 8R of the joining part 8, the hydrophobic fiber 61 which comprises the inner layer sheet 6 penetrates into the clearance gap between the hydrophilic fibers 41 which comprise the outer layer sheet 4, and the hydrophobic fiber which comprises the inner layer sheet 6 61, the hydrophilic fibers 41 constituting the outer layer sheet 4 have entered the gaps, and the hydrophilic fibers 41 constituting the outer layer sheet 4 and the hydrophilic fibers 51 constituting the skin side sheet 5 are in contact with each other. . Therefore, during wearing of the diaper 1, the sweat of the wearer is absorbed by the hydrophilic skin-side sheet 5, and the hydrophilicity of the outer layer sheet 4 that is in contact with the skin-side sheet 5 at the peripheral portion 8 </ b> R of the joint portion 8. By means of the fibers 41, the sweat of the wearer is easily transferred to the hydrophilic outer layer sheet 4 on the non-skin facing surface side. And since the sweat of the wearer who transferred to the outer layer sheet 4 is separated by the hydrophobic inner layer sheet 6, it is difficult to return to the hydrophilic skin side sheet 5 again. Thus, since the sweat of the wearer who has moved to the outer layer sheet 4 on the non-skin facing surface side is difficult to touch the skin, skin troubles such as eczema, rash and rash can be reduced.

  In the diaper 1, as shown in FIG. 2, a plurality of elastic members 71 are provided in a region extending from the waist stretchable part G <b> 1 to the waistline lower stretchable part G <b> 2 of each of the ventral region A and the backside region B. The joint rows 8L are arranged in an extended state in the lateral direction (Y direction) through the gaps between the joints 8L. And as shown in FIG. 4, when the elastic member 71 arranged in the stretched state contracts, the outer layer sheet 4 or the skin-side sheet 5 and the inner layer sheet 6 are disposed between the adjacent joint portion rows 8L and 8L. As a result, a hollow 3 </ b> H surrounded by the heel 3 </ b> F and the heel 3 </ b> F is formed between the outer layer sheet 4, the skin-side sheet 5, and the inner layer sheet 6. Therefore, the evaporability of the sweat of the wearer who has moved to the outer layer sheet 4 is improved. Moreover, since the sweat of the wearer who has transferred to the outer layer sheet 4 on the non-skin facing surface side is more difficult to touch the skin by the hollow portion 3H, skin troubles such as eczema, sweats and rashes can be further reduced.

From the viewpoint of further exerting an effect that the sweat of the wearer is easily transferred to the hydrophilic outer layer sheet 4 on the non-skin facing surface side, each of the joint portions 8 may have an area of 0.5 mm ² or more. Preferably, it is 0.75 mm ² or more, more preferably 5 mm ² or less, still more preferably 4 mm ² or less, and specifically 0.5 mm ² or more and 5 mm ² or less. It is more preferable that it is 0.75 mm ² or more and 4 mm ² or less.

  In addition, from the viewpoint of further achieving the above-described effects, each of the joint portions 8 has a perimeter length of preferably 2 mm or more, more preferably 3 mm or more, and 20 mm or less. It is preferably 15 mm or less, more specifically 2 mm or more and 20 mm or less, and more preferably 3 mm or more and 15 mm or less.

  From the viewpoint of further exerting an effect of efficiently transferring the sweat of the wearer to the hydrophilic outer layer sheet 4 on the non-skin facing surface side, the joint portion in the joint region (the peripheral portion 8R of the joint portion 8) where the joint portion 8 exists. The area occupied by 8 is preferably 1% or more, more preferably 3% or more, and preferably 15% or less, more preferably 10% or less, specifically It is preferably 1% or more and 15% or less, and more preferably 3% or more and 10% or less.

By providing a gap called the inner layer sheet 6, the sweat of the wearer who has moved to the outer layer sheet 4 on the non-skin facing surface side is less likely to return to the skin, and the sheet that has absorbed the sweat does not stick to the skin. From the standpoint of achieving one layer, the inner layer sheet 6 preferably has a basis weight of 10 g / m ² or more, more preferably 15 g / m ² or more, and preferably 30 g / m ² or less. 20 g / m ² or less, more preferably 10 g / m ² or more and 30 g / m ² or less, and more preferably 15 g / m ² or more and 20 g / m ² or less. .
From the same viewpoint, the inner layer sheet 6 is thicker than the joining portion 8 and the peripheral portion 8R of the joining portion 8 at a portion other than the joining portion 8 and the surrounding portion 8R of the joining portion 8, and is 0.11 mm or more. Preferably, it is 0.12 mm or more, more preferably 0.4 mm or less, still more preferably 0.35 mm or less, specifically 0.11 mm or more and 0.00. It is preferably 4 mm or less, and more preferably 0.12 mm or more and 0.35 mm or less. The thickness of the inner layer sheet 6 is measured using a thickness measuring instrument in a state where a load of 0.05 kPa is applied to the inner layer sheet 6. A laser displacement meter manufactured by OMRON Corporation is used for the thickness measuring instrument. Thickness is measured at 10 points, and the average value is calculated as the thickness.

The outer layer sheet 4 preferably has a basis weight of 10 g / m ² or more, and 13 g / m ² or more from the viewpoint of absorbing a larger amount of sweat on the non-skin facing side and reducing the amount of sweat contacting the skin. More preferably, it is preferably 30 g / m ² or less, more preferably 25 g / m ² or less, and specifically 10 g / m ² or more and 30 g / m ² or less. Preferably, it is more preferably 13 g / m ² or more and 25 g / m ² or less.
When the skin-side sheet 5 is separate from the outer layer sheet 4, the skin-side sheet 5 has a basis weight from the viewpoint of reducing the amount of sweat that touches the skin and reducing skin trouble without holding the sweat on the skin-side sheet itself. The basis weight of the outer layer sheet 4 is preferably smaller. More specifically, it is preferably 8 g / m ² or more, more preferably 10 g / m ² or more, and 25 g / m ² or less. Preferably, it is 20 g / m ² or less, more preferably 8 g / m ² or more and 25 g / m ² or less, preferably 10 g / m ² or more and 20 g / m ² or less. Is more preferable.
The basis weight of the outer sheet 4, the skin sheet 5, and the inner sheet 6 can be measured from the area of the measurable sheet and its weight. In this case, the measurement is performed at 23 ± 2 ° C. and a relative humidity of 50 ± 5%, and the sample is stored in the same environment for 24 hours or more before the measurement.

Further, from the viewpoint that the sweat is easily transferred from the skin-side sheet 5 to the outer-layer sheet 4 by increasing the capillary force of the outer-layer sheet more than the capillary force of the skin-side sheet, the portion excluding the joint portion 8 and the peripheral portion 8R of the joint portion 8 In this case, the outer layer sheet 4 preferably has an interfiber distance smaller than the interfiber distance of the skin-side sheet 5. More specifically, the outer layer sheet 4 is preferably 150 μm or less, and more preferably 70 μm or less. Although there is no restriction | limiting in particular in the minimum of the distance between the fibers of the outer layer sheet 4, if it is 5 micrometers or more, the effect which is fully satisfied is acquired.
The skin-side sheet 5 preferably has an inter-fiber distance larger than the inter-fiber distance of the outer layer sheet 4, preferably 250 μm or less, more preferably 150 μm or less, and 30 μm or more. Preferably, it is 40 μm or more, specifically, 30 μm or more and 250 μm or less is preferable, and 40 μm or more and 150 μm or less is more preferable.
The distance between the fibers of the outer sheet 4, the skin sheet 5, and the inner sheet 6 is measured by the following method.

[Measurement method of interfiber distance]
It can obtain | require by following formula (1).

Furthermore, from the viewpoint that perspiration is easily transferred from the skin-side sheet 5 to the outer-layer sheet 4 by making the hydrophilicity of the outer-layer sheet higher than the hydrophilicity of the skin-side sheet, ion exchange with the hydrophilic fibers 41 constituting the outer-layer sheet 4 is performed. The contact angle with water is preferably smaller than the contact angle between the hydrophilic fibers 51 constituting the skin-side sheet 5 and ion-exchanged water. More specifically, the hydrophilic fibers 41 constituting the outer layer sheet 4 preferably have a contact angle with ion-exchanged water of 80 ° or less, and more preferably 76 ° or less. Although there is no restriction | limiting in particular in the minimum of the contact angle of this hydrophilic fiber 41, if it is 40 degrees or more, the effect which can be fully satisfied is acquired.
The hydrophilic fibers 51 constituting the skin-side sheet 5 preferably have a contact angle with ion-exchanged water of 68 ° or more, more preferably 70 ° or more, and 88 ° or less. Preferably, it is 85 ° or less, more preferably 68 ° or more and 88 ° or less, and further preferably 70 ° or more and 85 ° or less.
The contact angle between the hydrophilic fibers 41 constituting the outer layer sheet 4 or the hydrophilic fibers 51 constituting the skin side sheet 5 and the ion-exchanged water is measured by the following method. The contact angle measured by the following method means that the lower the value, the higher the hydrophilicity.

[Measurement method of 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 ion-exchanged water is dropped onto the surface of the hydrophilic fiber 41 constituting the outer layer sheet 4 (about 20 picoliters), the contact angle is measured immediately using the contact angle meter. The measurement is performed at five or more locations of the hydrophilic fibers 41 constituting the outer layer sheet 4, and the average value thereof is used as the contact angle. The hydrophilic fibers 51 constituting the skin side sheet 5 are also measured in the same manner. The measurement environment temperature is 22 ° C.

Furthermore, from the viewpoint of further achieving the effects described above and further facilitating the transfer of the wearer's sweat absorbed by the hydrophilic skin-side sheet 5 to the hydrophilic outer-layer sheet 4 on the non-skin facing surface side, the outer-layer sheet. 4 is preferably larger than the water absorption height of the skin side sheet 5. More specifically, the outer layer sheet 4 has a 30 mm-wide Krem water absorption height measured in accordance with JIS P 8141, preferably 20 mm or more in 60 seconds, and more preferably 25 mm or more in 60 seconds. Although there is no restriction | limiting in particular in the upper limit of the Klem water absorption height of the outer layer sheet | seat 4, If it is 60 mm or less in 60 second, the effect which should be fully satisfied is acquired.
Further, the skin-side sheet 5 has a 30 mm-wide clem water absorption height measured in accordance with JIS P 8141, preferably 1 mm or more in 60 seconds, and more preferably 10 mm or more in 60 seconds. Although there is no restriction | limiting in particular in the upper limit of the Klem water absorption height of the skin side sheet | seat 5, if it is 30 mm or less in 60 seconds, the effect which is fully satisfied will be acquired.
The clem water absorption height of the outer layer sheet 4 or the skin side sheet 5 is measured by the following method.

[Measurement method of Klem water absorption height]
When the outer layer sheet 4 and the skin side sheet 5 are taken out from the exterior body of the pants-type disposable diaper, the outer layer sheet 4, the skin side sheet 5 and the inner layer sheet 6 are fixed by heat fusion or an adhesive. The fixed portion is removed by melting with hot air from a solvent or a dryer, and the outer layer sheet 4 and the skin side sheet 5 are taken out separately. Using each of the outer layer sheet 4 and the skin side sheet 5 taken out as samples, the water absorption height of the clem is measured according to the test method of JIS P 8141. Specifically, the taken-out outer layer sheet 4 is cut into a width (length of the diaper 1 in the longitudinal direction (X direction)) of 30 mm and a length (length of the diaper 1 in the lateral direction (Y direction)) of 150 mm. In cutting, a cutting method that may crush the sample, such as a press cutter, is not preferable because it has a high possibility of affecting the result. Therefore, when cutting, the cut surface of the sample is cut so as not to be crushed by using a knife, a cutter, a razor or the like. Next, the cut sample is set in a jig specified in JIS P 8141, and the water absorption height after 60 seconds is measured using water as a test solution. In order to easily distinguish the sucked height, the test liquid may be appropriately colored with a dye such as Blue No. 1 or methylene blue. The above measurement is performed 5 times, and the average value is defined as the Klem water absorption height of the outer layer sheet 4. It measures similarly about the clem water absorption height of the skin side sheet | seat 5. FIG. The measurement environment temperature is 22 ° C.

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 skin-side sheet 5 constituting the exterior body 3 is formed by a folded portion 4R of one outer layer sheet 4 as shown in FIG. The body may be a hydrophilic nonwoven fabric, and the inner layer sheet 6 may be in direct contact with the skin without the skin side sheet 5. When there is no skin side sheet 5, the hydrophilic fiber 41 constituting the outer layer sheet 4 extends downward (skin facing surface side) beyond the hydrophobic fiber 61 constituting the inner layer sheet 6. Thus, the hydrophilic fiber 41 directly absorbs sweat from the skin of the diaper wearer who sweats and can transfer the sweat to the outer sheet.

  Further, in the outer package 3 of the diaper 1, as shown in FIG. 3, the outer layer sheet 4 and the inner layer sheet 6 are bonded and fixed by a plurality of bonding portions 8 by heat fusion, and the skin side sheet 5 and the inner layer sheet 6 are bonded. Although it is fixed via the adhesive 9, the outer layer sheet 4, the inner layer sheet 6 and the skin side sheet 5 may all be bonded and fixed by the bonding portion 8 without arranging the adhesive 9. When the outer layer sheet 4, the inner layer sheet 6, and the skin side sheet 5 are all joined by a plurality of joint portions 8 that are arranged in a dispersed manner, in the peripheral portion 8 </ b> R of the joint portion 8, the hydrophilic layer that constitutes the outer layer sheet 4. The hydrophobic fibers 61 constituting the inner layer sheet 6 enter the gaps between the fibers 41, and the hydrophilic fibers 41 constituting the outer layer sheet 4 enter the gaps between the hydrophobic fibers 61 constituting the inner layer sheet 6. Become. Further, in the peripheral portion 8R of the joint 8, the hydrophobic fibers 61 constituting the inner layer sheet 6 enter the gaps between the hydrophilic fibers 51 constituting the skin side sheet 5, and the hydrophobic fibers constituting the inner layer sheet 6. The hydrophilic fibers 51 constituting the skin-side sheet 5 enter the gaps between the fibers 61. And the hydrophilic fiber 41 which comprises the outer layer sheet | seat 4 and the hydrophilic fiber 51 which comprises the skin side sheet | seat 5 come into contact. For this reason, the same effect as the above-described diaper 1 is obtained. The hydrophilic fiber 41 and the hydrophilic fiber 51 are in contact with each other as long as at least a portion where the hydrophilic fiber 41 and the hydrophilic fiber 51 are in contact with each other is provided. Skin side where the hydrophilic fibers 41 constituting the outer layer sheet 4 located above the inner layer sheet 6 (non-skin facing surface side) are located below the inner layer sheet 6 (skin facing surface side) via the inner layer sheet 6 It is preferable to have a portion that extends downward (skin facing surface side) beyond the hydrophilic fibers 51 constituting the sheet 5. And the hydrophilic fiber 51 which comprises the skin side sheet | seat 5 located in the downward direction (skin opposing surface side) of the inner layer sheet 6 via the inner layer sheet 6 is above the inner layer sheet 6 (non-skin). It is preferable to have a portion extending upward (on the non-skin facing surface side) beyond the hydrophilic fibers 41 constituting the outer layer sheet 4 located on the facing surface side.

  In the diaper according to the present invention, the hydrophilic fibers 41 constituting the outer layer sheet 4 are below the hydrophobic fibers 61 constituting the inner layer sheet 6 (at the skin facing surface side) at the peripheral portion 8R of the joint portion 8. When the wearer sweats, the hydrophilic fibers 41 constituting the outer layer sheet 4 are easily transferred to the outer layer sheet 4. For this reason, there exists a still more effect because the surrounding part 8R of the junction part 8 exists many per unit area.

  Further, in the outer package 3 of the diaper 1, as shown in FIG. 3, the outer layer sheet 4 and the inner layer sheet 6 are bonded and fixed by a plurality of bonding portions 8 by heat fusion, and the skin side sheet 5 and the inner layer sheet 6 are bonded. Although fixed through the adhesive 9, as shown in FIG. 5, the outer layer sheet 4 and the inner layer sheet 6 are bonded and fixed by a plurality of bonding portions 8B, and the inner layer sheet 4 and the skin side sheet 6 are bonded to each other. 9 may be fixed. Here, a through-hole 8P that penetrates the outer layer sheet 4 and the inner layer sheet 6 is formed at the center of the joint 8B. Since the through hole 8P is formed in this way, the outer layer sheet 4 and the inner layer sheet 6 are bonded at the outer peripheral edge portion of the through hole 8P in the bonding portion 8B. The joint portion 8B in which the through-hole 8P is formed can be formed by performing hot embossing on the portion where the outer layer sheet 4 and the inner layer sheet 6 are overlapped, similarly to the joint portion 8 described above. Compared to the case of forming the joint 8, the embossing temperature is increased or the embossing time is increased. Further, when the joining portion 8B in which the through-hole 8P is formed is formed by using an ultrasonic seal, a laser, or the like, the output is increased or melted compared to the case where the joining portion 8 is formed. It is formed by extending the time.

From the viewpoint of further exerting the effect of efficiently transferring the sweat of the wearer to the hydrophilic outer layer sheet 4 on the non-skin facing surface side, the through hole 8P penetrating the outer layer sheet 4 and the inner layer sheet 6 in the joint portion 8B, preferably being one formed in the joint portion 8B, the area is preferably at 0.45 mm ² or more 4.95 mm ² or less, still be at 0.7 mm ² or more 3.95 mm ² or less preferable.

  In the outer package 3 having the joint portion 8B in which the through-hole 8P shown in FIG. 5 is formed, the inner layer sheet 6 is disposed in the gap between the hydrophilic fibers 41 constituting the outer layer sheet 4 in the peripheral portion 8R of the joint portion 8. Hydrophobic fibers 61 constituting the outer layer sheet 4 enter the gaps between the hydrophobic fibers 61 constituting the inner layer sheet 6. And in the surrounding part 8R of the junction part 8, the hydrophilic fiber 41 which comprises the outer layer sheet | seat 4, and the hydrophilic fiber 51 which comprises the skin side sheet | seat 5 are contacting. Therefore, the diaper including the exterior body 3 having the joint portion 8B in which the through-hole 8P shown in FIG. 5 is formed has the same effect as the diaper 1 described above and can improve the air permeability.

  In the exterior body 3 having the joint portion 8B in which the through hole 8P shown in FIG. 5 is formed, the outer layer sheet 4 and the inner layer sheet 6 are joined by the joint portion 8B in which a plurality of through holes 8P are formed by heat fusion. The skin layer sheet 5 and the inner layer sheet 6 are fixed via an adhesive 9, but the outer layer sheet 4 is not formed by the adhesive 9 but is formed by the joint 8B in which the through hole 8P is formed. The inner layer sheet 6 and the skin side sheet 5 may all be bonded and fixed. When the outer layer sheet 4, the inner layer sheet 6, and the skin side sheet 5 are all joined at the joint 8 </ b> B in which the plurality of dispersed through holes 8 </ b> P are formed, the joint in which the through holes 8 </ b> P are formed. In the peripheral portion 8R of 8B, the hydrophobic fibers 61 constituting the inner layer sheet 6 enter the gaps between the hydrophilic fibers 41 constituting the outer layer sheet 4, and the gaps between the hydrophobic fibers 61 constituting the inner layer sheet 6 The hydrophilic fiber 41 which comprises the outer layer sheet | seat 4 comes in to. Further, in the peripheral portion 8R of the joint portion 8B in which the through hole 8P is formed, the hydrophobic fibers 61 constituting the inner layer sheet 6 enter the gaps between the hydrophilic fibers 51 constituting the skin side sheet 5, and the inner layer The hydrophilic fibers 51 constituting the skin side sheet 5 enter the gaps between the hydrophobic fibers 61 constituting the sheet 6. And the hydrophilic fiber 41 which comprises the outer layer sheet | seat 4 and the hydrophilic fiber 51 which comprises the skin side sheet | seat 5 come into contact. For this reason, the same effects as those of the diaper 1 described above can be obtained, and the air permeability can be further improved.

  Further, in the outer package 3 of the diaper 1, as shown in FIG. 3, the outer layer sheet 4 and the inner layer sheet 6 are bonded and fixed by a plurality of bonding portions 8 by heat fusion, and the skin side sheet 5 and the inner layer sheet 6 are bonded. Although fixed through the adhesive 9, as shown in FIG. 6, the hydrophilic fibers 41 constituting the outer layer sheet 4 and the hydrophobic fibers 61 constituting the inner layer sheet 6 are entangled at the joint 8C. The outer layer sheet 4 and the inner layer sheet 6 may be joined by a plurality of joining portions 8C. The joint portion 8C in which the fibers are intertwined can be formed using, for example, a needle punch. At the outer peripheral edge of the joint 8C, the hydrophilic fibers 41 constituting the outer layer sheet 4 and the hydrophobic fibers 61 constituting the inner layer sheet 6 are intertwined. In the outer peripheral edge of the joint portion 8C and the peripheral portion 8R of the joint portion 8, the hydrophobic fibers 61 constituting the inner layer sheet 6 enter the gaps between the hydrophilic fibers 41 constituting the outer layer sheet 4 to constitute the inner layer sheet 6. The hydrophilic fibers 41 constituting the outer layer sheet 4 have entered into the gaps between the hydrophobic fibers 61 to be performed. And the hydrophilic fiber 41 which comprises the outer layer sheet | seat 4, and the hydrophilic fiber 51 which comprises the skin side sheet | seat 5 are contacting in the outer periphery of the junction part 8C, and the surrounding part 8R of the junction part 8. FIG. Therefore, the diaper provided with the exterior body 3 having the joint portion 8C in which the fibers are intertwined as shown in FIG. 6 has the same effect as the diaper 1 described above.

  6, the outer layer sheet 4 and the inner layer sheet 6 are joined and fixed by the joint portion 8C due to the entanglement of the fibers, and the skin side sheet 5 and the inner layer sheet 6 are joined. Are fixed via the adhesive 9, but the outer layer sheet 4, the inner layer sheet 6 and the skin side sheet 5 are all bonded by the bonding portion 8C due to the entanglement of the fibers without providing the adhesive 9. It may be. When the outer layer sheet 4, the inner layer sheet 6 and the skin side sheet 5 are all joined at the joint portion 8C due to the entanglement of a plurality of dispersed fibers, the outer peripheral edge of the joint portion 8C and the periphery of the joint portion 8C In the portion 8R, the hydrophobic fibers 61 constituting the inner layer sheet 6 and the hydrophilic fibers 51 constituting the skin side sheet 5 enter the gaps between the hydrophilic fibers 41 constituting the outer layer sheet 4, and the skin side sheet 5, the hydrophilic fibers 41 constituting the outer layer sheet 4 and the hydrophobic fibers 61 constituting the inner layer sheet 6 enter the gaps between the hydrophilic fibers 51 constituting the outer fibers 5. The hydrophobic fiber 61 and the hydrophilic fiber 51 are intertwined. And the hydrophilic fiber 41 which comprises the outer layer sheet | seat 4 and the hydrophilic fiber 51 which comprises the skin side sheet | seat 5 come into contact. For this reason, the same effect as the above-described diaper 1 is obtained.

  Further, in the outer package 3 of the diaper 1, as shown in FIG. 3, the outer layer sheet 4 and the inner layer sheet 6 are bonded and fixed by a plurality of bonding portions 8 by heat fusion, and the skin side sheet 5 and the inner layer sheet 6 are bonded. Although it is fixed via the adhesive 9, the adhesive 9 may not be arranged. Moreover, in the exterior body 3 of the diaper 1, as shown in FIG. 2, the elastic member 71 is disposed between the outer layer sheet 4 and the inner layer sheet 6, but the elastic member 71 may not be disposed.

  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. 2, although the exterior body 3 is comprised from the outer layer sheet 4 and the inner layer sheet 6, the laminated sheet or outer layer sheet which consists of the outer layer sheet 4 and the inner layer sheet 6 A laminated sheet composed of 4, the inner layer sheet 6, and the skin side sheet 5 may be attached to at least the back side waist flap FB of the exterior body 3.

  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. In the case of a deployable disposable diaper having a liquid permeable top sheet, a liquid permeable back sheet, and an absorbent body between these sheets, the top sheet corresponds to the non-skin-side sheet 5. Then, skin contact is made with at least the back waist flap FB of the abdominal side waist flap FA and the back side waist flap FB which are located outward from the front and rear end portions in the longitudinal direction X of the absorbent body and extend in the lateral direction Y. What is necessary is just to arrange | position the separate hydrophobic skin side sheet | seat 4 which forms a surface.

  The following disposable diaper is further disclosed regarding the embodiment mentioned 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 an abdominal side waist flap and a back side waist flap that are located outward from the front and rear end portions and extend in the lateral direction, and at least the back side waist flap includes an inner layer sheet positioned on the skin facing surface side The outer layer sheet positioned on the non-skin facing surface side is joined by a plurality of joints dispersedly arranged, the inner layer sheet is a hydrophobic nonwoven fabric composed of hydrophobic fibers, and the outer layer sheet is hydrophilic. A hydrophilic non-woven fabric composed of a hydrophilic fiber, and in the peripheral portion of the joint portion, the hydrophobic fiber constituting the inner layer sheet enters the gap between the hydrophilic fibers constituting the outer layer sheet, Inner layer The hydrophilic fibers constituting the outer layer sheet have entered the gaps between the hydrophobic fibers constituting the sheet, and the hydrophilic fibers constituting the outer layer sheet have reached the skin facing surface of the inner layer sheet. Disposable diapers.

<2>
On the skin facing surface side of the inner layer sheet, a skin side sheet, which is a hydrophilic nonwoven fabric composed of hydrophilic fibers, is disposed, and in the peripheral portion of the joint, the hydrophilic layer constituting the outer layer sheet is disposed. The disposable diaper as described in said <1> in which the property fiber and the hydrophilic fiber which comprises the said skin side sheet | seat are in contact.
<3>
The disposable diaper according to <1> or <2>, wherein the inner layer sheet has a thickness of 0.11 mm or more in a portion excluding the joint and the periphery of the joint.
<4>
The disposable diaper according to any one of <1> to <3>, wherein the inner layer sheet has a basis weight of 10 g / m ² or more.
<5>
On the skin facing surface side of the inner layer sheet, a skin side sheet that is a hydrophilic nonwoven fabric composed of hydrophilic fibers is disposed, and the outer layer sheet has a clem water absorption height that is the same as that of the skin side sheet. The disposable diaper according to any one of <1> to <4>, which is larger than the water absorption height.
<6>
On the skin facing surface side of the inner layer sheet, a skin side sheet that is a hydrophilic nonwoven fabric composed of hydrophilic fibers is arranged, and the hydrophilic fibers and the ion-exchanged water that constitute the outer layer sheet The disposable diaper according to any one of <1> to <5>, wherein the contact angle is smaller than the contact angle between the hydrophilic fibers constituting the skin-side sheet and ion-exchanged water.
<7>
On the skin facing surface side of the inner layer sheet, a skin side sheet that is a hydrophilic nonwoven fabric composed of hydrophilic fibers is disposed, and excludes the joint portion and the peripheral portion of the joint portion in the outer layer sheet. The disposable diaper according to any one of <1> to <6>, wherein the interfiber distance of the portion is smaller than the interfiber distance of the portion excluding the joint portion and the peripheral portion of the joint portion in the skin side sheet.
<8>
Between the outer-layer sheet and the inner-layer sheet or between the skin-side sheet and the inner-layer sheet, the disposable diaper is extended in the lateral direction and is intermittently arranged in the longitudinal direction of the disposable diaper. The disposable diaper according to any one of <1> to <7>, further comprising a plurality of elastic members.
<9>
The junction disposable diaper according to any one of the area of one the joint portion is 0.5 mm ² or more 5 mm ² or less <1> to <8>.

<10>
The joint part is the disposable diaper according to any one of the above items <1> to <9>, wherein the length of the circumference of one joint part is 2 mm or more and 20 mm or less.
<11>
The disposable diaper according to any one of <1> to <10>, wherein a hole penetrating the outer layer sheet and the inner layer sheet is formed in the joint portion in the joint portion.
<12>
The interval between joints adjacent in the longitudinal direction constituting the joint row extending in the longitudinal direction is preferably 1 mm or more, more preferably 3 mm or more, preferably 20 mm or less, and 18 mm or less. The disposable diaper according to any one of <1> to <11>, which is more preferably present.
<13>
<1> The interval between the joint rows adjacent in the lateral direction is preferably 4 mm or more, more preferably 6 mm or more, preferably 20 mm or less, and more preferably 16 mm or less. The disposable diaper according to any one of to <12>.
<14>
The disposable diaper according to any one of <1> to <13>, wherein an adhesive is not disposed on the joint and the periphery of the joint.
<15>
On the skin facing surface side of the inner layer sheet, a skin side sheet that is a hydrophilic nonwoven fabric composed of hydrophilic fibers is disposed, and the adhesive excludes the joint portion and the peripheral portion of the joint portion. <1> to <14>, which are disposed on the skin facing surface of the inner layer sheet or the non-skin facing surface of the skin side sheet, and the skin side sheet and the inner layer sheet are fixed via an adhesive. The disposable diaper according to any one of the above.
<16>
The disposable diaper according to any one of <1> to <15>, wherein the hydrophilic fibers constituting the outer layer sheet and the hydrophobic fibers constituting the inner layer sheet are pressed to form a film.
<17>
On the skin facing surface side of the inner layer sheet, a skin side sheet that is a hydrophilic nonwoven fabric composed of hydrophilic fibers is disposed, and at the joint portion, the skin facing surface side of the inner layer sheet is located. The disposable diaper according to any one of <1> to <16>, wherein the hydrophilic fibers constituting the skin-side sheet have a portion in contact with the joint portion and are in contact therewith.
<18>
Each of the joint portions preferably has an area of 0.5 mm ² or more, more preferably 0.75 mm ² or more, preferably 5 mm ² or less, and 4 mm ² or less. More preferably, the disposable diaper according to any one of the above items <1> to <17>.
<19>
The length of each of the joints is preferably 2 mm or more, more preferably 3 mm or more, preferably 20 mm or less, and more preferably 15 mm or less. The disposable diaper according to any one of <1> to <18>.
<20>
The area occupied by the joint in the peripheral part of the joint is preferably 1% or more, more preferably 3% or more, preferably 15% or less, and preferably 10% or less. The disposable diaper according to any one of the above items <1> to <19>, which is more preferable.

<21>
The disposable diaper according to any one of <1> to <20>, wherein a hole penetrating the outer layer sheet and the inner layer sheet is preferably formed in the joint.
<22>
A hole penetrating the outer layer sheet and the inner layer sheet is formed in the joint, and one hole is preferably formed in the joint, and the area thereof is 0.45 mm ² or more. preferably 95mm ² or less, 0.7 mm ² or more 3.95 mm ² or less is still more preferable that the <1> the disposable diaper according to any one of the - <21>.
<23>
The inner layer sheet preferably has a basis weight of 10 g / m ² or more, more preferably 15 g / m ² or more, preferably 30 g / m ² or less, and 20 g / m ² or less. The disposable diaper according to any one of <1> to <22>, which is more preferably present.
<24>
The inner layer sheet preferably has a thickness of 0.11 mm or more, more preferably 0.12 mm or more, and 0.4 mm or less in the portion excluding the joint portion and the peripheral portion of the joint portion. The disposable diaper described in any one of the above items <1> to <23>, which is preferably 0.35 mm or less.
<25>
The basis weight of the outer layer sheet is preferably 10 g / m ² or more, more preferably 13 g / m ² or more, preferably 30 g / m ² or less, and 25 g / m ² or less. The disposable diaper according to any one of <1> to <24>, which is more preferably present.
<26>
On the skin facing surface side of the inner layer sheet, a skin side sheet that is a hydrophilic nonwoven fabric composed of hydrophilic fibers is arranged, and the outer layer sheet has a fiber-to-fiber distance between the fibers of the skin side sheet. The disposable diaper according to any one of the above items <1> to <25>, which is preferably smaller than the distance, preferably 150 μm or less, and more preferably 70 μm or less.
<27>
The skin-side sheet preferably has an interfiber distance larger than the interfiber distance of the outer layer sheet, preferably 250 μm or less, more preferably 150 μm or less, and preferably 30 μm or more, The disposable diaper according to any one of the above items <1> to <26>, which is more preferably 40 μm or more.
<28>
Any of the above <1> to <27>, wherein the hydrophilic fiber constituting the outer layer sheet has a contact angle with ion-exchanged water of preferably 80 ° or less, and more preferably 76 ° or less. The disposable diaper according to 1.
<29>
On the skin facing surface side of the inner layer sheet, a skin side sheet that is a hydrophilic nonwoven fabric composed of hydrophilic fibers is disposed, and the hydrophilic fibers constituting the skin side sheet are ion-exchanged water. The contact angle is preferably 68 ° or more, more preferably 70 ° or more, preferably 88 ° or less, and more preferably 85 ° or less <1> to <28. > The disposable diaper of any one of>.
<30>
The outer layer sheet preferably has a 30 mm-wide clem water absorption height of 20 mm or more in 60 seconds, and more preferably 25 mm or more in 60 seconds, measured according to JIS P 8141. The disposable diaper according to any one of <29>.

<31>
On the skin facing surface side of the inner layer sheet, a skin side sheet, which is a hydrophilic nonwoven fabric composed of hydrophilic fibers, is disposed, and the skin side sheet is 30 mm measured according to JIS P 8141. The disposable diaper according to any one of the above items <1> to <30>, wherein the width water absorption height of the clem is preferably 1 mm or more in 60 seconds, and more preferably 10 mm or more in 60 seconds.
<32>
Not only the back waist flap but also the abdomen waist flap are a plurality of the joint portions in which the inner layer sheet positioned on the skin facing surface side and the outer layer sheet positioned on the non-skin facing surface side are dispersedly arranged. The disposable diaper according to any one of <1> to <31>, which is formed by bonding.
<33>
On the skin facing surface side of the inner layer sheet, a skin side sheet that is a hydrophilic nonwoven fabric composed of hydrophilic fibers is disposed, and the skin side sheet is formed by a folded portion of the outer layer sheet. The disposable diaper according to any one of <1> to <32>.
<34>
Any one of the items <1> to <33>, wherein the joining portion is formed by superimposing the outer layer sheet and the inner layer sheet and subjecting the overlapped portion to heat embossing to melt and solidify the joint portion. The disposable diaper according to 1.
<35>
In the waist stretchable part, a plurality of elastic members are arranged between the pair of outer fixed regions, and the elastic member is disposed between the outer layer sheet and the inner layer sheet in each of the pair of outer fixed regions. The disposable diaper according to any one of <1> to <34>, wherein the disposable diaper is not fixed to either the outer layer sheet or the inner layer sheet between the pair of outer fixing regions.
<36>
On the skin facing surface side of the inner layer sheet, a skin side sheet that is a hydrophilic non-woven fabric composed of hydrophilic fibers is disposed, and the outer layer is disposed between the joining portion rows of the adjacent joining portions. A wrinkle formed of a sheet or the skin side sheet and the inner layer sheet is generated, and a hollow portion surrounded by the wrinkle and the wrinkle is formed between the outer layer sheet and the skin side sheet and the inner layer sheet. The disposable diaper according to any one of <1> to <35>, wherein is formed.
<37>
On the skin facing surface side of the inner layer sheet, a skin side sheet that is a hydrophilic nonwoven fabric composed of hydrophilic fibers is disposed, and when the skin side sheet is separate from the outer layer sheet 4, The basis weight of the skin side sheet is preferably smaller than the basis weight of the outer layer sheet, from the viewpoint of reducing the amount of sweat that contacts the skin without reducing the sweat on the skin side sheet itself and reducing skin trouble, 8 g / M ² or more, preferably 10 g / m ² or more, more preferably 25 g / m ² or less, and even more preferably 20 g / m ² or less <1> to <36> The disposable diaper described in any one of 36>.
<38>
The hydrophilic fibers constituting the outer layer sheet and the hydrophobic fibers constituting the inner layer sheet are entangled at the joint, and the outer layer sheet and the inner layer sheet are joined by a plurality of the joints. The disposable diaper according to any one of <1> to <37>.

<39>
The said outer layer sheet | seat is distribute | arranged to the non-skin-contacting surface side of the said absorptive main body, The disposable diaper any one of said <1>-<38> which forms the outer surface of the said disposable diaper.
<40>
On the skin facing surface side of the inner layer sheet, a skin side sheet that is a hydrophilic nonwoven fabric composed of hydrophilic fibers is arranged, and the basis weight of the outer layer sheet is more than the basis weight of the skin side sheet. The disposable diaper according to any one of <1> to <39>, which is also larger.
<41>
The outer layer sheet is a disposable diaper according to any one of <1> to <40>, wherein the outer layer sheet is either a spunbond nonwoven fabric or a meltblown nonwoven fabric.
<42>
On the skin facing surface side of the inner layer sheet, a skin side sheet that is a hydrophilic nonwoven fabric composed of hydrophilic fibers is disposed, and the elastic member is the outer layer adjacent to the longitudinal direction of the disposable diaper. <1> to <41 arranged between joints that join the sheet and the inner layer sheet, or between joints that join the outer layer sheet, the inner layer sheet, and the skin side sheet. > The disposable diaper of any one of>.
<43>
Any of <1> to <42>, wherein the inner layer sheet and the outer layer sheet are nonwoven fabrics made of thermoplastic fibers, and at least the joining portion that joins the inner layer sheet and the outer layer sheet is heat-sealed. The disposable diaper according to 1.

<44>
On the skin facing surface side of the inner layer sheet, a skin side sheet that is a hydrophilic nonwoven fabric composed of hydrophilic fibers is disposed, and at the joint, the outer layer sheet, the inner layer sheet, and the skin side A sheet is bonded, and in the peripheral portion of the bonded portion, hydrophilic fibers constituting the outer layer sheet enter a gap between the hydrophobic fibers constituting the inner layer sheet, and the skin side Hydrophobic fibers constituting the inner layer sheet enter the gaps between the hydrophilic fibers constituting the sheet, and the hydrophilic fibers constituting the outer layer sheet and the hydrophobic fibers constituting the inner layer sheet The disposable diaper according to any one of <1> to <43>, which is in contact with the hydrophilic fibers constituting the skin-side sheet.

  Hereinafter, the pants-type disposable diaper of the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited by the examples.

[Example 1]
A rectangular hydrophilic spunbonded nonwoven fabric having a length of 150 mm in the MD direction and a length of 30 mm in the CD direction was prepared as the nonwoven fabric for the skin side sheet. With respect to the nonwoven fabric for the skin-side sheet, the basis weight, the interfiber distance, the contact angle, and the clem water absorption height were measured by the method described above. The results are shown in Table 1 below.
Moreover, the hydrophilic spunbond nonwoven fabric of the same size as the nonwoven fabric for skin side sheets was prepared as a nonwoven fabric for outer layer sheets. With respect to the nonwoven fabric for the outer layer sheet, the basis weight, the interfiber distance, the contact angle, and the water absorption height of the clem were measured by the method described above. The results are shown in Table 1 below.
Moreover, the hydrophobic spunbond nonwoven fabric of the same size as the nonwoven fabric for skin side sheets was prepared as a nonwoven fabric for inner layer sheets. With respect to the nonwoven fabric for the inner layer sheet, the basis weight, the interfiber distance, the contact angle, and the water absorption height of the clem were measured by the method described above. The results are shown in Table 1 below.
The non-woven fabric for the inner layer sheet and the non-woven fabric for the outer layer sheet described above are overlapped, and using a heat embossing device, as shown in FIG. The nonwoven fabric for sheet | seat was joined and fixed, and the nonwoven fabric body of a 2 layer structure was produced. Next, an adhesive is applied to a portion of the non-woven fabric for the skin side sheet facing the non-woven fabric for the inner layer sheet, excluding the joint 8 and the peripheral portion 8R of the joint 8, A nonwoven fabric body of Example 2 having a three-layer structure was produced by joining the nonwoven fabric body having a two-layer structure. The produced nonwoven fabric body of Example 1 is obtained by overlapping the nonwoven fabric for the skin side sheet, the nonwoven fabric for the inner layer sheet, and the nonwoven fabric for the outer layer sheet in this order.

[Example 2]
As the nonwoven fabric for the outer layer sheet, except for using a hydrophilic spunbond nonwoven fabric having the basis weight, interfiber distance, contact angle, and clem water absorption height shown in Table 1 below, the same as the nonwoven fabric body of Example 1, The nonwoven fabric body of Example 2 was produced.

Example 3
As the nonwoven fabric for the skin side sheet, the same procedure as in the nonwoven fabric body of Example 1 was used except that a hydrophilic spunbond nonwoven fabric having the basis weight, interfiber distance, contact angle, and clem water absorption height shown in Table 1 below was used. The nonwoven fabric body of Example 3 was produced.

[Comparative Example 1]
As the nonwoven fabric for the outer layer sheet, except for using a hydrophobic spunbonded nonwoven fabric having the basis weight, interfiber distance, contact angle, and clem water absorption height shown in Table 1 below, the same as the nonwoven fabric body of Comparative Example 1, A nonwoven fabric of Comparative Example 1 was produced.

[Comparative Example 2]
As the nonwoven fabric for the inner layer sheet, except for using a hydrophilic spunbond nonwoven fabric having the basis weight, interfiber distance, contact angle, and clem water absorption height shown in Table 1 below, the same as the nonwoven fabric body of Comparative Example 2, A nonwoven fabric body of Comparative Example 2 was produced.

<Performance evaluation>
With respect to the nonwoven fabric bodies of Examples 1 to 3 and Comparative Examples 1 and 2, the evaporation time and the liquid diffusion area of the nonwoven fabric for the skin side sheet were measured by the following methods. The results are shown in Table 1 below.

[Method of measuring evaporation time]
The measurement of the evaporation time was performed using a precise rapid thermophysical property measuring apparatus: KES-F7 (Thermo Lab II) manufactured by Kato Tech Co., Ltd.
Specifically, 50 mg of ion exchange water is injected onto a hot plate installed in the chamber under a measurement environment of room temperature 23 ° C. and humidity 50% RH, and the joint 8 is arranged on the ion exchange water. The nonwoven fabric body of Examples 1-2 or the nonwoven fabric body of Comparative Examples 1-3 is installed so that the nonwoven fabric side for skin side sheets may be turned to the said hot-plate side. Then, outside air was blown from the upper part of the chamber toward the nonwoven fabric for the outer layer sheet in the nonwoven fabric body with a fan motor, and the time until the change in the amount of heat reached equilibrium was measured. As a hot plate, a KES-F7 (Thermo Lab II) BT plate (area: 10 × 10 cm ² , temperature: 33 ° C. (assuming human skin temperature)) was used. The amount of outside air sprayed by the fan motor was 0.2 m / sec. The measurement was performed three times, and the average value was taken as the evaporation time.

[Measurement method of liquid diffusion area]
The diffusion area of the colored water in the nonwoven fabric for the skin-side sheet of the sample after evaluation in the evaporation time evaluation was measured using an image analysis device. The measurement was performed three times, and the average value was defined as the liquid diffusion area.

  According to the result of Table 1, compared with the nonwoven fabric body of Comparative Examples 1 and 2, the nonwoven fabric body of Examples 1 to 3 has a narrow liquid diffusion area in the nonwoven fabric for the skin-side sheet, and also has an evaporation time. It turned out to be a short time. Therefore, the non-woven fabric for the skin side sheet, the non-woven fabric for the outer layer sheet, and the non-woven fabric for the inner layer sheet used in the nonwoven fabric body of Examples 1 to 2, respectively, are the skin side sheet 5, the outer layer sheet 4, and the inner layer sheet 6 respectively. If the pants-type disposable diaper is used, the sweat of the wearer preferentially shifts to the hydrophilic outer layer sheet 4 on the non-skin facing side rather than spreading on the skin side sheet 5 and quickly evaporates, causing skin trouble Reduction can be expected.

DESCRIPTION OF SYMBOLS 1 Pants type disposable diaper 2 Absorbent main body 21 Top sheet 22 Back sheet 23 Absorber 24 Leakage cuff 25 Leakage prevention cuff forming elastic member 3 Exterior body 4 Outer layer sheet 41 Hydrophilic fiber constituting outer layer sheet 5 Skin side sheet 51 Hydrophilic fiber 6 constituting the skin side sheet 6 Inner layer sheet 61 Hydrophobic fiber 71 constituting the inner layer sheet 71 Elastic member 72 Leg elastic member 8 Joint part 8L Joint part row 9 Adhesive A Abdominal side area, B Back side area , C Inseam area

Claims (10)

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,
At least the back waist flap is joined at a plurality of joints in which an inner layer sheet located on the skin facing surface side and an outer layer sheet located on the non-skin facing surface side are dispersedly arranged,
The inner layer sheet is a hydrophobic nonwoven fabric composed of hydrophobic fibers, and the outer layer sheet is a hydrophilic nonwoven fabric composed of hydrophilic fibers,
In the peripheral part of the joint, the hydrophobic fibers constituting the inner layer sheet enter the gaps between the hydrophilic fibers constituting the outer layer sheet, and the gaps between the hydrophobic fibers constituting the inner layer sheet A disposable diaper in which hydrophilic fibers constituting the outer layer sheet enter, and the hydrophilic fibers constituting the outer layer sheet reach the skin facing surface of the inner layer sheet. On the skin facing surface side of the inner layer sheet, a skin side sheet that is a hydrophilic nonwoven fabric composed of hydrophilic fibers is disposed,
The disposable diaper according to claim 1, wherein the hydrophilic fibers constituting the outer layer sheet and the hydrophilic fibers constituting the skin side sheet are in contact with each other at the peripheral portion of the joint portion.   The disposable diaper according to claim 1 or 2, wherein the inner layer sheet has a thickness of 0.11 mm or more in a portion excluding the joint portion and a peripheral portion of the joint portion. On the skin facing surface side of the inner layer sheet, a skin side sheet that is a hydrophilic nonwoven fabric composed of hydrophilic fibers is disposed,
The contact angle between the hydrophilic fibers constituting the outer layer sheet and ion-exchanged water is smaller than the contact angle between the hydrophilic fibers constituting the skin-side sheet and ion-exchanged water. The disposable diaper according to item 1. On the skin facing surface side of the inner layer sheet, a skin side sheet that is a hydrophilic nonwoven fabric composed of hydrophilic fibers is disposed,
The disposable diaper according to any one of claims 1 to 4, wherein the outer layer sheet has a higher water absorption height than the skin side sheet. On the skin facing surface side of the inner layer sheet, a skin side sheet that is a hydrophilic nonwoven fabric composed of hydrophilic fibers is disposed,
The inter-fiber distance of the part excluding the joint part and the peripheral part of the joint part in the outer layer sheet is smaller than the inter-fiber distance of the part excluding the joint part and the peripheral part of the joint part in the skin side sheet. The disposable diaper of any one of 1-5. On the skin facing surface side of the inner layer sheet, a skin side sheet that is a hydrophilic nonwoven fabric composed of hydrophilic fibers is disposed,
Between the outer-layer sheet and the inner-layer sheet or between the skin-side sheet and the inner-layer sheet, the disposable diaper is extended in the lateral direction and is intermittently arranged in the longitudinal direction of the disposable diaper. The disposable diaper according to any one of claims 1 to 6, further comprising a plurality of elastic members.   The disposable diaper according to any one of claims 1 to 7, wherein the joint portion has a circumference of one joint portion of 2 mm or more and 20 mm or less.   The disposable diaper according to any one of claims 1 to 8, wherein a hole penetrating the outer layer sheet and the inner layer sheet is formed in the joint portion in the joint portion. On the skin facing surface side of the inner layer sheet, a skin side sheet that is a hydrophilic nonwoven fabric composed of hydrophilic fibers is disposed,
In the joint portion, the outer layer sheet, the inner layer sheet and the skin side sheet are joined,
In the peripheral part of the joint part, the hydrophilic fibers constituting the outer layer sheet enter the gaps between the hydrophobic fibers constituting the inner layer sheet, and the hydrophilic fibers constituting the skin side sheet Hydrophobic fibers constituting the inner layer sheet have entered between the gaps, and both the hydrophilic fibers constituting the outer layer sheet and the hydrophobic fibers constituting the inner layer sheet constitute the skin side sheet. The disposable diaper of Claim 1 which is in contact with the hydrophilic fiber which does.