WO2019131216A1

WO2019131216A1 - Disposable diaper

Info

Publication number: WO2019131216A1
Application number: PCT/JP2018/046102
Authority: WO
Inventors: 章之植田; 優子福田
Original assignee: 花王株式会社
Priority date: 2017-12-27
Filing date: 2018-12-14
Publication date: 2019-07-04

Abstract

This disposable diaper (1) is provided with an absorbent body (2) comprising an absorber (23) and a surface sheet (21). The diaper (1) is equipped with a waist part. The waist part is divided into a ventral section (F) and a dorsal section (R). The dorsal section (R) has, as constituent sheets thereof, a hydrophobic sheet (31E) covering a dorsal end portion (2R) of the absorbent body (2) and a sweat-absorbent sheet (10) disposed on the skin-facing side of the hydrophobic sheet (31E). In a region (Q) where the sweat-absorbent sheet (10) and the absorbent body (2) overlap in the thickness direction, the bonding strength in a first bonding region (7U) where the sweat-absorbent sheet (10) and the hydrophobic sheet (31E) are bonded is greater than the bonding strength in a second bonding region (7D) where the hydrophobic sheet (31E) and the surface sheet (21) are bonded.

Description

Disposable diapers

The present invention relates to a disposable diaper provided with a sweat-absorbing sheet having a sweat-absorbing function.

As a disposable diaper, a surface sheet disposed in contact with the skin of the wearer, a back sheet disposed on the side farther from the skin of the wearer than the surface sheet, and an absorber interposed between the two sheets It is known that the absorbent body comprises an absorbent core comprising an absorbent material such as pulp, and a core wrap sheet for covering the absorbent core. In the disposable diaper of such a configuration, for the purpose of reducing skin troubles such as sweats, it is possible to place a sweat-absorptive sheet containing a hydrophilic material capable of absorbing sweat at a site that can come in contact with the wearer's skin at the time of wear. It is conventionally performed.

Patent Document 1 describes that a sweat absorbing sheet is attached on a hydrophobic sheet that covers the inner surface side of the front and rear waist area in the disposable diaper. The sweat-absorbent sheet entirely overlaps with the hydrophobic sheet in the thickness direction, and a non-joining area which does not bond to the hydrophobic sheet in a portion from the inward end of the sweat-absorbent sheet, and the non-joining area And a bonding area to be bonded to the hydrophobic sheet in the outer part of The inner end of the bonding area between the hydrophobic sheet and the waist area is disposed more inward than the inner end of the bonding area between the sweat-absorbent sheet and the hydrophobic sheet.

JP 2007-259874 A

The present invention is a disposable diaper including an absorbent main body including a surface sheet forming a skin-facing surface, and having a longitudinal direction corresponding to the front-rear direction of the wearer and a lateral direction orthogonal thereto. It has a waist portion which is disposed around the wearer's waist when worn, and the waist portion is composed of an abdominal side, which is disposed on the ventral side of the wearer when worn, and a dorsal side, which is disposed on the dorsal side. It is divided. At least the back side is disposed as a sheet constituting the back side across the lengthwise direction at the back side end in the longitudinal direction of the absorbent main body, and the skin facing surface side of the absorbent main body And a sweat-absorbent sheet disposed on the skin-facing side of the hydrophobic sheet. In a region overlapping the absorbent main body in the thickness direction, a bonding strength of a first bonding region bonding the sweat absorbent sheet and the hydrophobic sheet is bonding the hydrophobic sheet and the surface sheet. 2 greater than the bonding strength of the bonding area.

FIG. 1: is a perspective view which shows typically the underpants-type disposable diaper which is one Embodiment of the disposable diaper of this invention. Fig. 2 is a developed plan view schematically showing the skin-facing surface side (inner surface side) in the deployed and stretched state of the diaper shown in Fig. 1. FIG. 3 is a cross-sectional view schematically showing a cross section taken along line III-III in FIG. 2 (a cross section along the lateral direction). FIG. 4 is a cross-sectional view schematically showing a cross section taken along line IV-IV in FIG. 2 (a cross section along the lateral direction). FIG. 5 is a cross-sectional view schematically showing a VV cross section (a cross section along the longitudinal direction) of FIG. 2, and one end portion in the longitudinal direction of the diaper shown in FIG. ) Is a longitudinal cross-sectional view schematically showing the same. FIG. 6 is an explanatory view for explaining how a pocket is formed after the diaper shown in FIG. 5 is worn. FIG. 7: is a longitudinal cross-sectional view (equivalent view of FIG. 5) which expands the one end part (longitudinal end part of the back side) of the longitudinal direction in the diaper of other embodiment of the disposable diaper of this invention. It is.

Detailed Description of the Invention

It is preferable that the sweat-absorbent sheet is configured to easily shift the absorbed sweat away from the wearer's skin in the thickness direction of the sweat-absorbent sheet after absorbing the sweat of the wearer. In a disposable diaper having a sweat-absorbent sheet, the part on which the sweat-absorbent sheet is placed is often a part that is likely to rub with the wearer's body during wearing, and the sweat-absorbent sheet tends to curl up. In particular, as in the case of the disposable diaper described in Patent Document 1, when the inner end portion of the sweat-absorbent sheet is provided with a non-joining region, the non-joining region is more easily turned over. When the sweat absorbing sheet that absorbs sweat in this way is turned over, the sweat that has shifted to the direction away from the wearer's skin comes to touch the wearer's skin conversely, so if you continue to wear the disposable diaper, sweat etc. May cause skin problems.

Therefore, the present invention relates to a disposable diaper in which the sweat-absorbent sheet is difficult to turn up during wearing, and skin problems caused by sweat are less likely to occur.

The present invention will be described based on its preferred embodiments with reference to the drawings. 1 to 5 show a pants-type disposable diaper 1 which is an embodiment of the disposable diaper of the present invention. The diaper 1 is, as shown in FIGS. 1 to 5, a longitudinal direction X corresponding to a longitudinal direction of the wearer, ie, a direction extending from the ventral side to the dorsal side via the crotch and a transverse direction Y orthogonal thereto. have. The diaper 1 is provided with the absorptive main body 2 containing the surface sheet 21 which forms a skin opposing surface.

In the present specification, the "skin-facing surface" is a surface of the disposable diaper or a component thereof (for example, a surface sheet) directed to the skin side of the wearer when the disposable diaper is worn, that is, relatively close to the skin of the wearer. It is a side, and the "non-skin facing surface" is the surface of the disposable diaper or its component that is directed to the side opposite to the skin side when the disposable diaper is worn, that is, the side relatively away from the wearer's skin. In addition, "at the time of wear" here means the state in which the normal proper wearing position, ie, the correct wearing position of the said disposable diaper, was maintained.

The diaper 1 has a crotch M and a ventral side F and a dorsal side R extending in the longitudinal direction X from the front and rear of the crotch M, as shown in FIGS. 1 and 2. The crotch M is a portion disposed in the crotch of the wearer in the wearing state of the diaper 1, and the belly side F is the ventral side of the wearer in the wearing state of the diaper 1, that is, the longitudinal direction X of the wearer The dorsal portion R is a portion disposed on the dorsal side of the wearer, that is, on the rear side in the longitudinal direction X of the crotch M in the wearing state of the diaper 1. The ventral side F and the dorsal side R are waistline portions disposed around the waist of the wearer when the diaper 1 is worn. In other words, the diaper 1 has a waist portion, and the waist portion is divided into an abdominal side F and a dorsal side R.

The diaper 1 is provided with an absorbent main body 2 including a liquid-retaining absorbent 23 at the central portion in the lateral direction Y, and the non-skin facing side of the absorbent main body 2, ie, the absorbent main body 2 than the absorbent main body 2 It has an outer package 3 arranged on the side far from the body, and both side edges along the longitudinal direction X of the outer package 3 in each of the ventral side F and the back side R are adhesive, heat seal, ultrasonic seal, etc. Are joined together by the known joining means, and, as shown in FIG. 1, the pair of side seals S, S, the waist opening WH through which the wearer's A pair of leg openings LH, LH are formed.

The absorbent main body 2 has a rectangular shape in a plan view in the unfolded and stretched state of the diaper 1 as shown in FIG. 2 and extends in the longitudinal direction X from the abdominal side F to the dorsal side R, and its longitudinal direction Are aligned with the longitudinal direction X of the diaper 1 in the unfolded and stretched state, and are disposed at the central portion in the transverse direction Y of the exterior body 3 and joined to the exterior body 3 by an adhesive. In the “deployed and stretched state” of the diaper 1, the diaper 1 is separated at the side seal portion S to be in the deployed state, and the expanded member in the deployed state is stretched by the elastic members of the respective parts. In this case, it is in the state of being expanded to the same size as when it is expanded in a planar state in the excluded state.

As shown in FIG. 3 and FIG. 4, the absorbent main body 2 has a liquid-permeable surface sheet 21 forming the skin-facing surface, and a liquid-impermeable or liquid-impermeable liquid forming the non-skin-facing surface. The back sheet 22 and a liquid-retaining absorber 23 disposed between the two

sheets

21 and 22 are provided, and they are integrated by a known bonding means such as an adhesive. The surface sheet 21 has the total length in the longitudinal direction X and the total length in the lateral direction Y at least equal to or longer than the total length in the longitudinal direction X and the total length in the lateral direction Y of the absorber 23, respectively. It is disposed on the surface side and covers the absorber 23. The total length in the longitudinal direction X of the absorbent main body 2 is at least the same as the total length of the absorbent body 23, and as shown in FIGS. 2 and 5, both

longitudinal ends

23a and 23a of the absorbent body 23 It is located inward of the longitudinal direction X than the directional end. As back sheet 22, various kinds of sheets conventionally used for this type of disposable diaper can be used without particular limitation. For example, as the back sheet 22, a resin film, a laminate of a resin film and a non-woven fabric, or the like can be used. The surface sheet 21 will be described later.

As shown in FIGS. 3 and 4, the absorbent body 23 covers a liquid-retaining absorbent core 24 mainly composed of an absorbent material, and the outer surface of the absorbent core 24, that is, the skin facing surface and the non-skin facing surface. And a core wrap sheet 25. The absorbent core 24 has a rectangular shape elongated in the longitudinal direction X in a plan view as shown in FIG. 2 and extends in the longitudinal direction X from the ventral side F to the dorsal side R. As an absorptive material which makes the main part of absorptive core 24, what is used especially as a material of an absorber in this kind of disposable diaper can be used without restriction, for example, wood pulp, synthetic fiber treated by hydrophilization, Water-absorbing polymers and the like can be mentioned. As a typical form of the absorbent core 24, a fiber assembly of hydrophilic fibers such as wood pulp or one in which a particulate water-absorbing polymer is held in the fiber assembly can be exemplified.

In the diaper 1, the core wrap sheet 25 is a single continuous liquid-permeable sheet having a width twice to three times the length of the absorbent core 24 in the transverse direction Y, as shown in FIGS. 3 and 4. As shown, the entire area of the skin facing surface of the absorbent core 24 is covered, and extends outward from both side edges along the longitudinal direction X of the absorbent core 24 in the lateral direction Y, and the extended portion is absorbent It is rolled down below the core 24 to cover the entire non-skin facing surface of the absorbent core 24. The absorbent core 24 and the core wrap sheet 25 may be joined by a known joining means such as a hot melt adhesive. As the core wrap sheet 25, liquid-permeable sheets, such as paper, various nonwoven fabrics, and an apertured film, can be used, for example.

In the present invention, the core wrap sheet 25 may not be such a single sheet, for example, a sheet of skin-side core wrap sheet that covers the skin-facing surface of the absorbent core 24; It may be configured separately from the side core wrap sheet and including a single non-skin side core wrap sheet that covers the non-skin facing surface of the absorbent core 24.

The absorptive main body 2 has the leak-barrier cuff 26 in the both sides along the longitudinal direction X in the skin opposing surface of the absorptive main body 2, as shown in FIG.2 and FIG.3. The leak-barrier cuff 26 on each side is a water-repellent and breathable leak-barrier cuff-forming sheet 27 continuous along the entire length in the longitudinal direction X of the absorbent main body 2 and one lateral direction Y of the sheet 27. It is configured to include one or a plurality of elastic members for forming a cuff 28 fixed to the end portion in an extended state in the longitudinal direction X. The leakproof cuff-forming sheet 27 is a cuff body in which the other end in the lateral direction Y extends to the non-skin facing surface of the backsheet 22 of the absorbent body 2 along the entire length in the longitudinal direction X of the absorbent body 2 It is fixed by a fixing portion 291. And, in each of the ventral end 2F and the back end 2R of the absorbent main body 2 in the longitudinal direction X, one end of the leakproof cuff forming sheet 27 is a surface sheet on the absorber 23 in the lateral direction Y. The free end fixing portion 292 is fixed to the surface 21 facing the skin. When the diaper 1 is worn, the contraction force of the cuff forming elastic member 28 acts in the longitudinal direction X, and at least in the crotch M, one end of the sheet 27 becomes a free end, starting from the cuff main body fixing portion 291 A leak-barrier cuff 26 is formed that stands up to the wearer's skin. As described above, at the ventral end 2F and the back end 2R, the free end portion of the leak-barrier cuff 26 is fixed on the skin-facing surface of the top sheet 21 by the free end fixing portion 292. When worn, the elastic member 28 contracts so that the free end portion in which the cuff forming elastic member 28 is disposed is erected at the crotch M.

As shown in FIGS. 2 and 4, the leakproof cuff-forming sheet 27 constituting the pair of

leakproof cuffs

26 and 26 disposed on both sides along the longitudinal direction X of the absorbent main body 2 is the absorbent main body 2. Of the back side 2R and the back side 2R are covered by a folded back portion 31E which is disposed on the skin-facing surface side of the absorbent main body 2 and is disposed across the longitudinal direction X. . The folded portion 31E is joined at the ventral end 2F and the back end 2R at the cuff joint region 7K and the pair of leak-

barrier cuffs

26 and 26 to be covered. The means for joining the folded portion 31E forming each cuff joint area 7K and the leak-barrier cuff-forming sheet 27 constituting each leak-barrier cuff 26 is not particularly limited, and known bonding means such as adhesive or fusion may be used. In the diaper 1, an adhesive is used.

The outer package 3 forms the outer shape of the diaper 1 in the unfolded and stretched state as shown in FIG. 2, and the periphery of the outer package 3 is the contour of the diaper 1 in that state, that is, the belly F, the crotch M and The outline of each dorsal side R is formed. As shown in FIG. 2, the exterior body 3 has a rectangular shape in which the length in the lateral direction Y is longer than the longitudinal direction X in the ventral side F and the dorsal side R, and the ventral side F and the dorsal side In the crotch M located between R and R, both side edges along the longitudinal direction X of the exterior body 3, that is, a pair of leg edges LS, LS are curved in a convex arc shape toward the center of the lateral direction Y In the plan view as shown in FIG. 2, the central region in the longitudinal direction X is in the shape of an hourglass that is narrowed inward in the lateral direction Y.

As shown in FIGS. 3 to 5, the exterior body 3 has an outer layer sheet 31 that forms the outer surface of the diaper 1, that is, a non-skin facing surface, and an inner layer sheet 32 disposed opposite to the skin facing surface of the outer layer sheet 31. And a laminate of In the wearing state of the diaper 1, the outer layer sheet 31 is located on the side far from the wearer's body to form the non-skin opposing surface (outer surface) of the diaper 1, and the inner layer sheet 32 is located on the side closer to the wearer's body. Then, the skin opposing surface (inner surface) of the diaper 1 is formed. The outer layer sheet 31 and the inner layer sheet 32 are bonded to each other at a predetermined site via bonding means such as an adhesive.

In the diaper 1, the outer layer sheet 31 extends from the end edge of the inner layer sheet 32 in the longitudinal direction X to the ventral side F and the dorsal side R, as shown in FIGS. It has the folding | returning part 31E turned over to the surface side. In the ventral side F, the folded back portion 31E covers the ventral side end 2F of the absorbent main body 2 in the longitudinal direction X and is joined to the top sheet 21 of the absorbent main body 2 at the second bonding area 7D. . Further, in the back side R, the folded back portion 31E covers the back side end 2R in the longitudinal direction X of the absorbent main body 2 and is joined to the top sheet 21 of the absorbent main body 2 at the second bonding area 7D. ing. The bonding means of the folded portion 31E forming the second bonding area 7D and the surface sheet 21 is not particularly limited, and a known bonding means such as an adhesive or fusion may be used. In the diaper 1, the adhesive is It is used.
In FIG. 5, the dorsal side R is shown enlarged and the enlarged view of the ventral side F is not shown, but the ventral side F is also configured in the same manner as the dorsal side R, and unless otherwise specified, The description of the dorsal side R applies to the abdominal side F as appropriate.

As described above, in the diaper 1, as shown in FIGS. 2 and 4, in the belly side F, the folded back portion 31E is disposed across the longitudinal direction X in the belly side end 2F of the absorbent main body 2 Along the side facing the skin of the absorbent main body 2. The folded back portion 31E covers the abdominal end 2F of the absorbent main body 2 and is joined to the top sheet 21 of the absorbent main body 2 at the second bonding area 7D. The leak cuffs 26 and 26 are joined at a cuff joint area 7K. Then, in the belly side F, the folded portion 31E is also joined to the inner layer sheet 32 of the exterior body 3. Similarly, in the back side R, the folded back portion 31E covers the back side end 2R of the absorbent main body 2 and is joined to the top sheet 21 of the absorbent main body 2 at the second bonding area 7D, The pair of leak-

barrier cuffs

26, 26 of the absorbent main body 2 is joined at a cuff joint area 7K. Then, in the back side R, the folded portion 31E is also joined to the inner layer sheet 32 of the exterior body 3. The folded portion 31E and the inner layer sheet 32 are bonded to each other at a predetermined site via bonding means such as an adhesive.

The

sheets

31 and 32 constituting the exterior body 3 may be sheets of the same kind as each other as long as they are hydrophobic sheets or sheets of different kinds. Examples of different types of sheets include forms having different stretchability from one another. Specifically, for example, as the outer layer sheet 31, a hydrophobic stretchable sheet having stretchability in the lateral direction Y is used, and as the inner layer sheet 32, a non-stretchable hydrophobic non-stretchable sheet is used. Can. For example, the elasticity of the outer layer sheet 31 may be partially different. Specifically, the portions of the outer layer sheet 31 located on the ventral side F and the dorsal side R have elasticity in the lateral direction Y. The form which consists of an elastic sheet which it has, and the part located in the crotch M in the outer-layer sheet | seat 31 consists of a non-elastic sheet which does not have elasticity is mentioned.

Examples of the stretch sheet that can be used as the exterior body 3 include a stretch sheet in which a stretchable fiber layer is integrated on both sides or one side of the elastic fiber layer, and an elastic fiber layer and a stretchable fiber layer Examples of the method of integration include a method of laminating both and hydroentangling, a method of interlacing fibers by air through, etc., and a method of bonding by heat embossing, adhesive, ultrasonic waves and the like. Moreover, as a non-stretchable sheet which can be used as the exterior body 3, the nonwoven fabric by various manufacturing methods is mentioned, for example, A spun bond nonwoven fabric, an air through nonwoven fabric, a needle punch nonwoven fabric can be illustrated specifically ,.

As shown in FIG. 1, FIG. 2 and FIG. 5, a plurality of thread-like or strip-like waist elastic members 33 are arranged in a stretched state in the lateral direction Y on each of the ventral side F and the dorsal side R The waist elastic members 33 are intermittently arranged at predetermined intervals in the longitudinal direction X. Thus, by arranging the waist elastic member 33 in a state in which the elastic stretchability is expressed, the opening edge portion of the waist opening WH has an annular waist substantially continuous over the entire circumference thereof. Gather is formed. Further, one or a plurality of leg elastic members 34 for forming a leg gather forming a string or a strip are arranged in a stretched state at the leg edge LS forming the opening edge of each of the pair of leg openings LH and LH. This forms an annular leg gather that is substantially continuous over the entire circumference of the opening edge of each of the pair of leg openings LH, LH. Each of the

elastic members

33 and 34 is sandwiched and fixed between the outer layer sheet 31 and the inner layer sheet 32 which constitute the outer package 3 by a bonding means such as an adhesive.

In the diaper 1, as described above, as shown in FIG. 5, the exterior body 3 is disposed on the side farther from the skin of the wearer of the diaper 1 than the absorbent main body 2. In addition, the exterior body 3 is stretchable in the lateral direction Y due to the provision of the waist elastic member 33 fixed in a stretched state in the lateral direction Y, and stretchable in the same direction. It consists of a sheet.

As used herein, the term "elastic" means the property of being extensible in a predetermined direction and contracting when the elongation is released. The sheet being substantially non-elastic (non-elastic) in a certain direction means that the sheet hardly stretches even when a pulling force is applied to the sheet in the certain direction. Do. For example, for a sample of length 15 × width 5 cm, when the sample is longitudinally pulled with a material tensile tester such as Tensilon, and the breaking elongation at the time of breaking the sample is 10% or less, The sample is substantially non-elastic in the longitudinal direction. The elongation at break can be calculated by (the length of the sample at break−the original length of the sample) / (the original length of the sample) × 100.

As shown in FIG. 5, the dorsal side R is a sheet constituting the dorsal side R, a hydrophobic sheet covering the dorsal end 2R of the absorbent main body 2, and the skin-facing side of the hydrophobic sheet. And a sweat-absorbent sheet 10 to be arranged. In the diaper 1, the sheet constituting the back side R is the outer layer sheet 31, the inner layer sheet 32, the folded portion 31E of the outer layer sheet 31, and the sweat absorbing sheet 10, and the hydrophobicity covering the dorsal end 2R of the absorbent main body 2 The folded portion 31E of the outer layer sheet 31 corresponds to the elastic sheet. An elastic member 33 is disposed in a stretched state in the lateral direction Y on the back side R. Although the back side R may partially inhibit the elasticity of the elastic member 33, the whole has elasticity in the lateral direction Y due to the provision of the elastic member 33. doing.

The sweat-absorbing sheet 10 is intended to absorb sweat around the waist of the wearer, and is disposed at a site that can come in contact with the skin of the wearer when worn in the diaper 1. In the diaper 1, as shown in FIG. 1, FIG. 2, FIG. 4 and FIG. 5, the wearer wears the abdominal side F and the dorsal side R, which are waist portions disposed around the wearer's waist when worn. The sweat absorbing sheet 10 is disposed at a position close to the skin. The sweat absorbing sheet 10 is joined to the folded portion 31E of the outer layer sheet 31, which is a hydrophobic sheet, at a first joining area 7U. The means for bonding the sweat-absorbent sheet 10 forming the first bonding area 7U and the folded portion 31E is not particularly limited, and a known bonding means such as an adhesive or fusion can be used.
The basis weight of the sweat absorbing sheet is preferably 12 g / m ² or more, more preferably 15 g / m ² or more, and preferably 50 g / m ² or less, more preferably 45 g / m ² or less, from the viewpoint of absorbing sweat. is there.

In the diaper 1, the sweat-absorbent sheet 10 has a shape elongated in one direction in a plan view as shown in FIG. 2, specifically a rectangular shape, with its longitudinal direction aligned with the lateral direction Y, abdominal side F and back It is distribute | arranged over the full length of the cross direction Y of each side R. As shown in FIG. The sweat-absorbent sheet 10 long in the lateral direction Y is disposed on the back side R, covering both the absorbent placement area where the absorbent 23 is disposed and the absorbent non-placement area where the absorbent 23 is not disposed. It is done. The absorber non-arrangement area is an area (side flap area) located outside the lateral direction Y from both side edges along the longitudinal direction X of the absorber 23 and its imaginary extension line, and the longitudinal direction end of the absorber ( It includes the longitudinal end 23a) of the absorbent body 23 and a region (end flap region) located outward in the longitudinal direction X than the virtual extension line thereof. Thus, the sweat-absorbent sheet 10 is disposed on the dorsal side R so as to straddle both the absorbent placement area and the absorbent non-placement area, and is not placed on the crotch M and not on the belly side. It differs from the surface sheet 21 disposed across the ventral side F and the dorsal side R in that it is disposed at F or dorsal side R.

The sweat-absorbent sheet 10 is disposed along the open end of the waist opening WH on the skin-facing surface side of the back side R, in the vicinity of the open end. The sweat absorbing sheet 10 is, as shown in FIG. 5, an outer end 10a in the longitudinal direction X relatively near the waist opening WH, and a longitudinal direction X located relatively far from the waist opening WH on the crotch M side. And the longitudinal ends 10a and 10b extend in parallel to the lateral direction Y. The outer end 10a of the sweat absorbing sheet 10 in the longitudinal direction X is located outward of the longitudinal end 23a of the absorbent body 23 in the longitudinal direction X, and the inward end 10b of the sweat absorbing sheet 10 in the longitudinal direction X is an absorbent It is located inward of the longitudinal direction X than the longitudinal end 23a of the twenty-third. The longitudinal end 23 a of the absorbent body 23 is also the longitudinal end of the absorbent core 24 or the core wrap sheet 25.

In the diaper 1, since the sweat absorbing sheet 10 having a sweat absorbing function is disposed at a portion (around the waist opening WH on the surface facing the skin) which can come in contact with the wearer's skin, it is caused by sweat such as sweats, eczema and rash Skin problems are reduced. Then, in a region Q shown in FIG. 5 where the sweat absorbing sheet 10 and the absorbent main body 2 overlap in the thickness direction, bonding of the first bonding region 7U bonding the sweat absorbing sheet 10 and the folded portion 31E which is a hydrophobic sheet. The strength is greater than the bonding strength of the second bonding area 7D that bonds the folded portion 31E, which is a hydrophobic sheet, and the surface sheet 21 of the absorbent main body 2. According to such a configuration, the sweat absorbing sheet 10 absorbs the sweat of the wearer during wearing of the diaper 1, and then the sweat absorbing sheet 10 absorbs the sweat during wearing even if the sweat absorbing sheet 10 having absorbed the sweat rubs with the wearer's body. The folded-back portion 31E is easily flipped from the top sheet 21 before the sweat absorbing sheet 10 is flipped from the folded-back portion 31E. If sweat absorbing sheet 10 is curled up and it touches the skin, the curled up part becomes double because sweat absorbing sheet 10 is doubled, and the amount of absorption of sweat increases, and if it touches the skin of the wearer directly, it will be skin such as rubella It is thought that trouble is likely to occur. On the other hand, when it turns over from the surface sheet 21, since the folding | returning part 31E is a hydrophobic sheet, even if it continues to wear the diaper 1 in that state, skin troubles, such as a sweat rash, do not produce it easily. Further, as shown in FIG. 6, the pocket P is formed between the flipped-up hydrophobic folded portion 31E and the surface sheet 21 by the folding-back portion 31E being flipped from the surface sheet 21. Leakage of body fluid such as urine from part R can be prevented.

From the viewpoint of more easily achieving the above effects, the bonding strength of the first bonding area 7U is preferably 1.5 times or more, preferably 2.0 times or more the bonding strength of the second bonding area 7D. Furthermore, it is preferably 7.5 times or less, more preferably 5.0 times or less, and preferably 1.5 times or more and 7.5 times or less, 2.0 times More preferably, it is not less than 5.0 times.
Specifically, the bonding strength of the first bonding area 7U is preferably 1.5 N / 25 mm or more, more preferably 2.0 N / 25 mm or more, and preferably 25 N / 25 mm or less 20 N / 25 mm or less is more preferable, and 1.5 N / 25 mm or more and 25 N / 25 mm or less is preferable, and 2.0 N / 25 mm or more and 20 N / 25 mm or less is more preferable.
The bonding strength of the second bonding region 7D is preferably 0.5 N / 25 mm or more, more preferably 1.0 N / 25 mm or more, and preferably 3.0 N / 25 mm or less, 2 .5 N / 25 mm or less is more preferable, and 0.5 N / 25 mm to 3.0 N / 25 mm is preferable, and 1.0 N / 25 mm to 2.5 N / 25 mm is more preferable .
The bonding strength of the first bonding area 7U and the second bonding area 7D is measured by the following method.

<Method of measuring bonding strength>
In a 22 ° C, 65% RH environment, the disposable diaper is extended to such an extent that the gather formed by the contraction of each elastic member disappears, and the absorbent sheet 10 and the absorbent main body 2 include an area Q overlapping in the thickness direction Then, a rectangular measuring piece which is long in the longitudinal direction X of 40 mm in the longitudinal direction X of 25 mm in the lateral direction Y is cut out. When cutting out, a portion corresponding to the overlapping region Q is cut out at least at one end in the longitudinal direction X of the measurement piece. Next, for example, in the case of measuring the bonding strength of the first bonding area 7U, peel off between the sweat absorbing sheet 10 and the folded portion 31E which is a hydrophobic sheet on the other end side in the longitudinal direction X of the measurement piece, The portion of the sweat absorbing sheet 10 peeled off the upper chuck and the lower chuck of a tensile tester (for example, Tensilon tensile tester “RTA-100” manufactured by Orientec Co., Ltd.) such that the measurement piece is in the tensile direction in the longitudinal direction X. And attach the portion of the folded back portion 31E. At this time, the distance between both chucks is 10 mm. Then, with the position of the lower chuck fixed, the upper chuck is raised at a speed of 300 mm / min. As the upper chuck moves upward, the measurement piece breaks in the longitudinal direction X and separates into the sweat absorbing sheet 10 and the folded portion 31E. The breaking strength is measured until the length of the broken part is 25 mm, and the maximum value is determined. This measurement is repeated five times, and the average value is taken as the bonding strength of the first bonding region 7U. When measuring the bonding strength of the second bonding area 7D, peel off the space between the folded portion 31E, which is a hydrophobic sheet, and the surface sheet 21 on the other end side in the longitudinal direction X of the measurement piece, and upper and lower chucks The portion of the folded back portion 31E peeled off and the portion of the surface sheet 21 are attached. After that, the bonding strength of the second bonding area 7D is measured in the same manner as the bonding strength of the first bonding area 7U.

When the top sheet 21 and the sweat absorbing sheet 10 move following the movement of the skin while the diaper 1 is being worn, the folding section 31E is further easily flipped from the top sheet 21 before the sweat absorbing sheet 10 is flipped from the folding section 31E. Therefore, in a region Q where the sweat absorbing sheet 10 and the absorbent main body 2 overlap in the thickness direction, it is preferable that the sweat absorbing sheet 10 and the absorbent core 24 overlap. The surface sheet 21 disposed at a position near the absorbent core 24 follows the movement of the skin as compared to the sweat absorbing sheet 10 disposed at a position farther from the absorbent core 24 than the surface sheet 21. This is because the constituent fibers are easily deformed, distortion is easily generated in the second bonding area 7D which joins the folded portion 31E and the top sheet 21, and the second bonding area 7D is easily peeled off.

It is easy to further form the pocket P shown in FIG. 6 between the hydrophobic folded portion 31E and the surface sheet 21 and to further prevent the leakage of body fluid such as urine from the back R, at least the back R In the above, the joint strength of the cuff joint area 7K of each of the leak-barrier cuffs 26 is preferably larger than the joint strength of the second joint area 7D, more preferably 1.5 times or more, and 2.0 times or more In particular, it is more preferably 7.5 times or less, particularly preferably 5.0 times or less, and still more preferably 1.5 times or more and 7.5 times or less. And 2.0 times or more and 5.0 times or less.
Specifically, the bonding strength of the cuff bonding area 7K of each of the leak-barrier cuffs 26 is preferably 1.5 N / 25 mm or more, more preferably 2.0 N / 25 mm or more, and 15 N / 25 mm or less Is preferably 10 N / 25 mm or less, and more preferably 1.5 N / 25 mm or more and 15 N / 25 mm or less, and further preferably 2.0 N / 25 mm or more and 10 N / 25 mm or less preferable.
The joint strength of the cuff joint area 7K of each of the leak-barrier cuffs 26 is measured by the following method.

<Method of Measuring Bonding Strength of Cuff Bonding Region 7K>
In a 22 ° C. 65% RH environment, the disposable diaper is stretched to such an extent that the gathers formed by the contraction of each elastic member disappear and the cuff bonding area 7K is included: 25 mm in the horizontal direction 40 mm in the longitudinal direction X Cut out a long rectangular measuring piece in the longitudinal direction X of. When cutting out, the cuff bonding area 7K is cut out so as to be located at at least one end in the longitudinal direction X of the measurement piece. Next, on the other end side in the longitudinal direction X of the measurement piece, peel off the space between the leak-barrier cuff sheet 27 and the folded portion 31E which is a hydrophobic sheet, and the longitudinal direction X becomes the tensile direction. Thus, the portion of the leakproof cuff forming sheet 27 peeled off and the portion of the folded portion 31E are attached to the upper chuck and the lower chuck of a tensile tester (for example, Tensilon tensile tester “RTA-100” manufactured by Orientec Co., Ltd.). At this time, the distance between both chucks is 10 mm. Then, with the position of the lower chuck fixed, the upper chuck is raised at a speed of 300 mm / min. As the upper chuck moves upward, the measurement piece is broken in the longitudinal direction X and separated into the leak-barrier cuff-forming sheet 27 and the folded portion 31E. The breaking strength is measured until the length of the broken part is 10 mm, and the maximum value is determined. This measurement is repeated five times, and the average value is taken as the joint strength of the cuff joint area 7K.

As shown in FIG. 5, the sweat absorbing sheet 10 has its longitudinal direction X in the longitudinal direction, as shown in FIG. 5, from the viewpoint of forming a location where the sweat absorbing sheet becomes double and the amount of sweat absorbing increases when it is flipped up and touching the skin. The inward end 10b is located at the same position in the longitudinal direction X as the inward end 31E1 in the longitudinal direction X of the hydrophobic folded back portion 31E, or outside the inward longitudinal direction X than the inward end 31E1 of the folded back portion 31E. It is preferable to be positioned in the direction, and it is more preferable to be positioned outward in the longitudinal direction X than the inward end 31E1 of the turnback portion 31E. When arranged in this manner, the sweat absorbing sheet 10 is difficult to be turned up due to the inward end 10 b of the sweat absorbing sheet 10 while the diaper 1 is being worn.

As shown in FIG. 5 from the viewpoint of making the folded portion 31E easier to be flipped from the surface sheet 21, as shown in FIG. 5, the first bonding area 7U joining the sweat absorbing sheet 10 and the folded portion 31E is the inward end in the longitudinal direction X thereof. 7U1 is positioned at the same position in the longitudinal direction X as the inward end 7D1 in the longitudinal direction X of the second joining region 7D joining the folded portion 31E and the surface sheet 21, or in the second joining region 7D It is preferable to be located inward in the longitudinal direction X than the inward end 7D1, and it is more preferable to be located inward in the longitudinal direction X than the inward end 7D1 of the second bonding region 7D.

From the viewpoint of three-dimensionally forming the shape of the pocket P formed between the hydrophobic folded portion 31E and the surface sheet 21 and further preventing leakage of body fluid such as urine from the back side R, at least On the side R, a folded portion 31E formed of a hydrophobic sheet covering the back end 2R of the absorbent main body 2 is the free end fixing portion 292 disposed at the innermost side in the transverse direction Y in each of the leakproof cuffs 26. It is preferable to extend to a region located inward in the longitudinal direction X rather than (see FIG. 4) and be joined to each of the leak-barrier cuffs 26. In other words, it is preferable that the cuff joint region 7K (see FIG. 2) of each of the leak-barrier cuffs 26 extend to a region located inward in the longitudinal direction X than the free end fixing portion 292.

It is preferable that the inter-fiber distance of the surface sheet 21 is larger than the inter-fiber distance of the sweat absorbing sheet 10 from the viewpoint of making the folding part 31 E easier to flip up from the surface sheet 21 before the sweat absorbing sheet 10 is flipped from the folding part 31E. This is because when the inter-fiber distance of the top sheet 21 increases, the junction between the folded portion 31E and the top sheet 21 decreases, and the junction strength tends to decrease. In the case where the top sheet 21 has a laminated structure, the inter-fiber distance of the layer closest to the skin facing surface which easily affects the bonding strength with the folded portion 31E is measured. Similarly, in the case where the sweat absorbing sheet 10 has a laminated structure, the inter-fiber distance of the layer on the non-skin-facing surface side most likely to affect the bonding strength with the folded portion 31E is measured. The inter-fiber distance of the top sheet 21 is preferably 250 μm or less, more preferably 150 μm or less, and preferably 50 μm or more, still more preferably 70 μm or more, specifically, The thickness is preferably 50 μm or more and 250 μm or less, and more preferably 70 μm or more and 150 μm or less. The inter-fiber distance of the sweat-absorbent sheet 10 is preferably 150 μm or less, more preferably 90 μm or less, and preferably 5 μm or more, more preferably 10 μm or more, specifically, The thickness is preferably 5 μm or more and 150 μm or less, and more preferably 10 μm or more and 70 μm or less. The difference between the inter-fiber distance of the surface sheet 21 and the inter-fiber distance of the sweat absorbing sheet 10 is preferably 20 μm or more, more preferably 30 μm or more, and preferably 100 μm or less, more preferably 90 μm or less as the former and the latter. It is.
The inter-fiber distance of the surface sheet 21 and the inter-fiber distance of the sweat absorbing sheet 10 are measured by the following method.

<Method of measuring inter-fiber distance>
The inter-fiber distance of the fiber assembly such as non-woven fabric and paper is determined by the following equation (1) based on the Wrotnowski's assumption. The following equation (1) is generally used to determine the inter-fiber distance of the fiber assembly. Under Wrotnowski's assumption, the fibers are cylindrical and the fibers are regularly arranged without intersection.
When the sheet to be measured has a single-layer structure, the inter-fiber distance of the single-layer sheet can be obtained by the following formula (1).
When the sheet to be measured is a multilayer structure such as an SMS non-woven fabric, the inter-fiber distance of the sheet of the multilayer structure is determined according to the following procedure.
First, the inter-fiber distance of each fiber layer constituting the multilayer structure is calculated by the following equation (1). At that time, the thickness t, the basis weight W, the resin density ρ of the fiber and the fiber diameter D used in the following formula (1) are respectively used for the layer to be measured. The thickness t, the basis weight W, and the fiber diameter D are each an average value of measurement values at a plurality of measurement points.
The thickness t (mm) is measured by the following method. First, a sheet to be measured is cut in the longitudinal direction 50 mm × the width direction 50 mm to prepare a cut piece of the sheet. Next, the cut piece is placed on a flat plate, the glass plate on the flat plate is placed thereon, the weight is uniformly placed on the glass plate so that the load including the glass plate is 49 Pa, and then the cutting is performed. Measure the thickness of the piece. The measurement environment is a temperature of 20 ± 2 ° C., a relative humidity of 65 ± 5%, and a measuring instrument is a microscope (VHX-1000, manufactured by Keyence Corporation). The measurement of the thickness of the cut piece first obtains an enlarged photograph of the cut surface of the cut piece. In this magnified image, one of known dimensions is simultaneously copied. Next, the scale is adjusted to the enlarged photograph of the cut surface of the cut piece, and the thickness of the cut piece, that is, the thickness of the sheet to be measured is measured. The above operation is performed three times, and the average value of three times is taken as the thickness t of the sheet to be measured. When the sheet to be measured is a laminated product, the boundary is determined from the fiber diameter, and the thickness is calculated.
The basis weight W (g / m ² ) is obtained by cutting a sheet to be measured into a predetermined size (for example, 12 cm × 6 cm), and after mass measurement, measuring the mass with an area determined from the predetermined size It is calculated | required by remove | dividing ("Basic weight W (g / m < ² >) = mass / area calculated | required from predetermined | prescribed magnitude | size"). Measure four times, and let the average value be basis weight.
The resin density ρ (g / cm ³ ) of the fiber is measured according to the measurement method of the density gradient tube method described in JIS L1015 chemical fiber staple test method using a density gradient tube (URL is http: // kikakurui.com/l/L1015-2010-01. html, and if it is a book, it is described in JIS handbook fiber -2000, pages 764 to 765 of the Japan Standards Association).
For the fiber diameter D (μm), ten fiber cross sections of the cut fiber are measured using an S-4000 field emission scanning electron microscope manufactured by Hitachi, Ltd., and the average value is defined as the fiber diameter. The measuring method of the fiber diameter D follows the <measuring method of a fiber diameter> mentioned later.
Next, the inter-fiber distance of each layer is multiplied by the ratio of the thickness of the layer to the total thickness of the multilayer structure, and the values of the layers thus obtained are summed to obtain a sheet of the desired multilayer structure. The inter-fiber distance of the constituent fibers of For example, in an SMS non-woven fabric having a three-layer structure consisting of two S layers and one M layer, the two S layers are collectively treated as one layer, and the thickness t of the entire three-layer structure is 0.11 mm, When the thickness t of the S layer is 0.1 mm, the inter-fiber distance LS of the S layer is 47.8 μm, the thickness t of the M layer is 0.01 mm, and the inter-fiber distance LS of the M layer is 3.2 μm, such an SMS non-woven fabric The inter-fiber distance of the constituent fibers of is 43.8 μm [= (47.9 × 0.1 + 3.2 × 0.01) /0.11].

When the top sheet 21 and the sweat absorbing sheet 10 move following the movement of the skin while the diaper 1 is being worn, the folding section 31E is further easily flipped from the top sheet 21 before the sweat absorbing sheet 10 is flipped from the folding section 31E. Therefore, it is preferable that the thickness t21 of the top sheet 21 be larger than the thickness t10 of the sweat-absorbent sheet 10. The larger surface sheet 21 is more likely to be deformed in configuration fibers than the sweat absorbing sheet 10, and the second bonding area 7D connecting the folded portion 31E and the surface sheet 21 is easily distorted and easily peeled off. In order to

The thickness t21 of the surface sheet 21 is preferably 5 mm or less, more preferably 3 mm or less, and preferably 0.2 mm or more, further preferably 0.5 mm or more, and more specifically It is preferable that the distance is 0.2 mm or more and 5 mm or less, and more preferably 0.5 mm or more and 3 mm or less. The thickness t10 of the sweat absorbing sheet 10 is preferably 2 mm or less, more preferably 1 mm or less, and preferably 0.1 mm or more, further preferably 0.2 mm or more, and more specifically The thickness is preferably 0.1 mm or more and 2 mm or less, and more preferably 0.2 mm or more and 1 mm or less. The difference between the thickness t21 of the top sheet 21 and the thickness t10 of the sweat absorbing sheet 10 is preferably 0.8 mm or more, more preferably 1 mm or more, and preferably 4 mm or less, more preferably 3 mm or less as the former and the latter. It is.
The thickness t21 of the surface sheet 21 and the thickness t10 of the sweat absorbing sheet 10 are measured by the method of measuring the thickness in the method of measuring the distance between fibers described above.

The fiber diameter D21 of the constituent fibers of the surface sheet 21 is greater than the fiber diameter D10 of the constituent fibers of the sweat absorbing sheet 10, from the viewpoint of making it easier for the folded part 31E to be easily peeled from the surface sheet 21 before the sweat absorbent sheet 10 is folded from the folding part 31E. It is preferable to be large. The surface sheet 21 having a larger fiber diameter has a smaller bonding point between the folded portion 31E and the surface sheet 21 than the sweat absorbing sheet 10, and the bonding strength tends to be small.

The fiber diameter D21 of the top sheet 21 is preferably 25 μm or less, more preferably 20 μm or less, and preferably 8 μm or more, further preferably 10 μm or more, specifically, The thickness is preferably 8 μm or more and 25 μm or less, and more preferably 10 μm or more and 20 μm or less. The fiber diameter D10 of the sweat-absorbent sheet 10 is preferably 20 μm or less, more preferably 18 μm or less, and preferably 1 μm or more, further preferably 5 μm or more, specifically, The thickness is preferably 1 μm to 20 μm, and more preferably 5 μm to 18 μm. The difference between the fiber diameter D21 of the top sheet 21 and the fiber diameter D10 of the sweat absorbing sheet 10 is preferably 2 μm or more, more preferably 3 μm or more, and preferably 10 μm or less, more preferably 8 μm or less as the former and the latter. It is.
The fiber diameter D21 of the top sheet 21 and the fiber diameter D10 of the sweat-absorbent sheet 10 are measured by the fiber diameter measurement method in the above-described inter-fiber distance measurement method.

As shown in FIGS. 3 to 5, the surface sheet 21 has an uneven shape on the surface facing the skin, from the viewpoint of making it easier for the folded portion 31E to be easily flipped from the surface sheet 21 before the sweat absorbing sheet 10 is flipped from the folded portion 31E. It is preferable to have. When only the convex portion of the uneven shape on the skin facing surface of the surface sheet 21 is bonded to the sweat-absorbent sheet 10, the bonding point between the folded portion 31E and the surface sheet 21 decreases, and the bonding strength tends to decrease. The uneven | corrugated shape of the skin opposing surface of the surface sheet 21 is not specifically limited, The uneven | corrugated shaped surface sheet in this kind of disposable diaper can be employ | adopted suitably. As an example of a concavo-convex shape, a form where a plurality of convex parts are distributed in the shape of a dispersed point over the entire skin facing surface of the surface sheet, and the periphery of each convex part is a concave can be mentioned. The plan view shape of the convex portion is not particularly limited, and may be appropriately selected from a circle, an ellipse, a polygon having a quadrangle or more, and the like. Specifically, for example, a first concave portion in a plane view shape extending in a first direction crossing both the longitudinal direction X and the lateral direction Y on the skin facing surface of the surface sheet 21 and a second recess intersecting the first direction There is a mode in which second concave portions in the shape of a flat line of sight extending in the direction are arranged in a lattice, and convex portions exist in each of a plurality of sections surrounded by both concave portions. Further, as another example of the concavo-convex shape, a convex portion as a ridge extending in the longitudinal direction X or a lateral direction Y and a concave portion as a groove extending in the same direction are orthogonal to the extending direction thereof. The form alternately arranged in the direction may be mentioned. Moreover, the convex part (ridge part) which comprises uneven | corrugated shape may be a solid structure with which the constituent fiber of the surface sheet was filled inside, and a hollow structure may be sufficient as it. As an example of the surface sheet having a hollow structure, the projections are partially joined in a laminated state, and one sheet relatively closer to the skin of the wearer is the other sheet at a portion other than the joint portion. The form which protrudes in the direction away from (a sheet | seat relatively far from a wearer's skin), and forms the some convex part which protrudes toward a wearer's skin side is mentioned. Incidentally, as shown in FIGS. 3 and 4, the non-skin facing surface of the top sheet 21 is usually a flat surface having substantially no uneven shape.

A liquid permeable sheet material conventionally used in this type of disposable diaper can be used as the surface sheet 21. For example, non-woven fabric manufactured by card method, air-through non-woven fabric, spun-bonded non-woven fabric, melt-blown non-woven fabric, span Various non-woven fabrics such as lace non-woven fabric and needle punch non-woven fabric; These non-woven fabrics and films may be subjected to a hydrophilization treatment using a hydrophilizing agent such as a surfactant. The basis weight of the top sheet 21 is preferably 12 g / m ² or more, more preferably 15 g / m ² or more, and preferably 50 g / m ² or less, more preferably 45 g / m ² or less.

In the diaper 1, as described above, the waist elastic member 33 is disposed in a stretched state in the lateral direction Y on the belly side F and the back side R which are waist areas disposed around the waist of the wearer when worn The elastic folded region formed by the waist elastic member 33 is formed on each of the abdominal side F and the dorsal side R, and the hydrophobic folded back portion 31E is formed by devising the elastic stretchable region in the lateral direction Y. It is possible to further facilitate the formation of the pocket P shown in FIG. Specifically, in the diaper 1, as shown in FIG. 2, in the longitudinal direction X at the same position as the region K where the folded-back portion 31E and the surface sheet 21 which are hydrophobic sheets overlap in the thickness direction at least at the back side R A certain region KT is divided into a central portion KT1 in which the absorbent main body 2 is located, and a pair of side portions KT2 and KT2 which are located in the lateral direction Y outward from both side edges along the longitudinal direction X of the absorbent main body 2 it can. And as for central part KT1, it is preferred that tensile stress of cross direction Y is low compared with each side part KT2. If the stretching stress in the lateral direction Y of the central portion KT1 is lower than the stretching stress in the lateral direction Y of each side portion KT2 at least in the dorsal side R, the pocket P formed by the central portion KT1 is less likely to be crushed In order to As a method of reducing the extension stress in the lateral direction Y of the central portion KT1, at least a part of each waist elastic member 33 disposed in the extension state in the lateral direction Y in each of the abdominal side F and the dorsal side R In a region overlapping the absorbent main body 2 in the thickness direction, a method of performing processing such as finely dividing so as not to exhibit elastic stretchability can be mentioned. The elongation stress is measured by the following method.

<Method of measuring elongation stress>
Expand the diaper 1 and spread it in a planar shape, and along the straight line parallel to the transverse direction Y of the diaper 1, the central portion KT1 and the respective side portions KT2 by 70 mm in the transverse direction Y and 25 mm in the longitudinal direction X 25 mm It is cut out as a long rectangular measuring piece in the direction Y. In the case of this cutting out, using the exterior body 3 including the sweat absorbing sheet 10 from which the absorbent main body 2 and the like are removed, the measurement piece is cut from the exterior body 3. Both ends of the measurement piece in the longitudinal direction (horizontal direction Y) are sandwiched between chucks of a Tentilon universal tester (RTC-1210A) manufactured by ORIENTEC. At this time, the distance between the two chucks is 30 mm. Then, the measurement piece is elongated in the longitudinal direction at a speed of 300 mm / min, and the stress of the measurement sample at that time is measured. Specifically, when the length of the measurement piece in a state in which the

sheets

31 and 32 of the exterior body 3 are not contracted by the elastic member 33 is 100 in the lateral direction Y, the measurement piece is extended to a length equivalent to 90 The tensile load (cN) when shrunk to a length of 70 after that is taken as the tensile stress of the measurement piece. The tensile stress of the measurement piece, that is, the tensile stress of the central portion KT1 and the tensile stress of each side portion KT2, is calculated as an average stress by converting it to the length in the longitudinal direction (lateral direction Y) of each portion. .
The reason for defining the return force at a length corresponding to 70 when the length of the measurement piece in a non-contracted state is 100 as the extension stress of the measurement piece as described above is the diaper It has a length that assumes installation.

The ratio of the tensile stress in the lateral direction Y of each side portion KT2 to the tensile stress in the lateral direction Y of the central portion KT1 (each side portion KT2 / the central portion KT1) is preferably 1.2 or more, more preferably 1. It is 5 or more, preferably 4.0 or less, and more preferably 3.5 or less.
The tensile stress in the transverse direction Y of the central portion KT1 is preferably 5 cN / mm or more, more preferably 7.5 cN / mm or more, and preferably 25 cN / mm or less, more preferably 20 cN / mm or less.
The tensile stress in the lateral direction Y of each side portion KT2 is preferably 2 cN / mm or more, more preferably 3 cN / mm or more, and preferably 15 cN / mm or less, more preferably 12 cN / mm or less.

The sweat-absorbent sheet 10 is typically a non-woven fabric. As a nonwoven fabric which constitutes sweat absorption sheet 10, although a nonwoven fabric by various manufacturing methods which can be used as a constituent member of this kind of disposable diaper can be used without particular restriction, it is made not to leave sweat sweated on the skin opposing surface side. From the viewpoint, it is preferable that the sweat absorbing sheet 10 be a sheet having a lower degree of hydrophilicity than the non-skin facing surface side of the skin facing surface side.

As an index of the degree of hydrophilicity of the surface (skin facing surface, non-skin facing surface) of the sweat absorbing sheet 10, the contact angle with water measured by the following method can be used. It can be judged that the smaller the contact angle with water measured by the following method, the higher the hydrophilicity (the lower the hydrophobicity), and the larger the contact angle, the lower the hydrophilicity (the higher the hydrophobicity).
The contact angle between the skin facing surface of the sweat absorbing sheet 10 and the ion exchange water is preferably 90 ° or more, more preferably 100 ° or more, and preferably 150 ° or less, and 140 ° or less. Is more preferably 90 ° to 150 °, and more preferably 100 ° to 140 °.
Further, the contact angle between the non-skin facing surface of the sweat absorbing sheet 10 and the ion exchange water is preferably smaller than 90 °, more preferably 88 ° or less, and particularly preferably 85 ° or less, 35 ° or more is preferable, 40 ° or more is more preferable, and specifically, 35 ° or more and less than 90 ° are preferable, and 35 ° or more and 88 ° or less are more preferable, and 40 It is particularly preferable that the angle is not less than ° and not more than 85 °.

<Method of measuring contact angle of fiber layer (non-woven fabric)>
From the fiber layer (non-woven fabric) to be measured, cut out a square shape in plan view of 150 mm in the MD direction which is the machine direction at the time of producing this non-woven fabric and 70 mm in the CD direction orthogonal to the MD. Droplets of ion-exchanged water are deposited on the surface to be measured, the droplets are recorded, and the contact angle is measured based on the recorded image. More specifically, a microscope VHX-1000 manufactured by Keyence Corporation is used as a measurement apparatus, and a medium magnification zoom lens is attached to the microscope while being tilted at 90 °. The measurement sample is set on the measurement stage of the measurement apparatus so that the surface to be measured faces upward and can be observed from the CD direction of the measurement sample. Then, a droplet of 3 μL of ion-exchanged water is attached to the measurement surface of the measurement sample set on the measurement stage, and the image of the droplet is recorded and taken into the measurement device. Among the plurality of recorded images, select 10 images in which both ends or one end is clear in the CD direction of the droplet, measure the contact angle of the droplet for each of the 10 images, and average the contact angles Is the contact angle of the fiber layer (non-woven fabric) to be measured. The measurement environment is 20 ° C./50% RH.

There is no particular limitation on the form of the sweat absorbing sheet having a magnitude relationship of “skin facing surface <non-skin facing surface” with regard to the degree of hydrophilicity, and a single layer structure may be employed. As a preferred embodiment of such a sweat absorbing sheet, it has a laminated structure including a first layer forming the skin facing surface and a second layer forming the non-skin facing surface, and the first layer is the second layer. And a laminated non-woven fabric having a lower degree of hydrophilicity than the above.

In the laminated nonwoven fabric, one or more other layers may be interposed between the first layer and the second layer in the laminated structure. Further, it is preferable that the plurality of layers constituting the laminated structure be joined and integrated with each other, and as the joint portion, the thickness is smaller than that of the peripheral portion and the layers constituting the laminated structure are mutually fused A fused part between layers is preferred. Such a fusion-bonded portion may be squeezed with heat, ultrasonic waves, or other means for promoting melting of the constituent fibers (thermoplastic fibers), specifically, for example, heat sealing, ultrasonic sealing, etc. It can be formed by applying to a laminated structure. In addition, it is preferable that a plurality of the fusion-bonded portions are scattered on the skin facing surface and / or the non-skin facing surface of the laminated nonwoven fabric. The fusion-bonded portion may be recessed concavely from the skin facing surface side to the non-skin facing surface side, and conversely, it may be recessed from the non-skin facing surface side to the skin facing surface side. , The former is preferred. The nonwoven fabric of the single layer structure may also have the fusion-bonded portion in which constituent fibers (thermoplastic fibers) are fused to each other, as in the case of the laminated nonwoven fabric.

When the sweat absorbing sheet 10 has the fusion-bonded portion, the fusion-bonded portion is disposed on the skin-facing surface of the sweat absorbing sheet from the viewpoint of adhesion to the folded portion 31E which is a hydrophobic sheet. preferable. In the embodiment in which the fusion-bonded portion is disposed on the skin-facing surface of the sweat absorbing sheet, in addition to the configuration in which the skin-facing surface and the non-skin facing surface of the sweat-absorbing sheet are disposed only on the skin-facing surface, The form arrange | positioned on both the opposing surface and the non-skin opposing surface is also included. When the fusion-bonded portion is disposed on both the skin-facing surface and the non-skin-facing surface, the depth of the depression of the fusion-bonded portion is greater on the skin-facing surface side than on the non-skin-facing surface side preferable.

As a fiber (A fiber whose content occupies preferably 70% by mass or more of all constituent fibers of the first layer) constituting the main body of the first layer (layer forming the skin facing surface) of the laminated nonwoven fabric, for example, hydrophobicity Thermoplastic fibers (heat fusible fibers) can be used. The material of the hydrophobic thermoplastic fiber is, for example, a polyolefin such as polyethylene and polypropylene as a hydrophobic thermoplastic resin; a polyester such as polyethylene terephthalate; a polyamide such as nylon 6 and nylon 66; polyacrylic acid and polymethacrylic acid Alkyl ester, polyvinyl chloride, polyvinylidene chloride etc. are mentioned, These 1 type can be used individually or in combination of 2 or more types.

Moreover, as a fiber (A fiber whose content occupies preferably 70% by mass or more of the total constituent fibers of the second layer) constituting the main body of the second layer (layer forming the non-skin facing surface) of the laminated nonwoven fabric is hydrophilic. Thermoplastic fibers (heat fusion fibers), specifically, for example, intrinsically hydrophilic thermoplastic fibers such as polyacrylonitrile fibers, or hydrophobicity usable in the first layer Hydrophilic thermoplastic fibers may be subjected to a hydrophilization treatment, and one of these may be used alone or in combination of two or more. As the latter “hydrophilized thermoplastic fiber”, for example, a thermoplastic fiber into which a hydrophilizing agent is kneaded, a thermoplastic fiber to which a hydrophilizing agent is attached to the surface, a thermoplastic fiber to which plasma processing has been applied Etc. The hydrophilizing agent is not particularly limited as long as it is a general hydrophilizing agent used for hygiene products. In addition, fibers that are inherently hydrophilic, for example, natural or semi-natural fibers such as cellulose fibers can also be used.

The first layer and the second layer constituting the laminated non-woven fabric may each be a short-fiber non-woven fabric mainly composed of short fibers, or a long-fiber non-woven fabric mainly composed of long fibers. Examples of the short fiber non-woven fabric include an air through non-woven fabric, a spunlace non-woven fabric, a needle punched non-woven fabric, and a chemically bonded non-woven fabric. Examples of long fiber non-woven fabrics include single-layer non-woven fabrics such as spunbond non-woven fabrics and meltblown non-woven fabrics, or laminated non-woven fabrics having spunbond layers mainly composed of long fibers, meltblown layers and the like, heat roll non-woven fabrics by card method, etc. Examples of the laminated nonwoven fabric include spunbond-spunbond laminated nonwoven fabric (SS nonwoven fabric), spunbond-spunbond-spunbond laminated nonwoven fabric (SSS nonwoven fabric), spunbond-meltblown-spunbond laminated nonwoven fabric (SMS nonwoven fabric), span Bond-meltblown-meltblown-spunbond nonwoven fabric (SMMS nonwoven fabric) and the like can be mentioned.

The basis weight of the first layer (the layer forming the skin facing surface) constituting the laminated nonwoven fabric is preferably 8 g / m ² or more, more preferably 10 g / m ² or more, and preferably 30 g / m ² or less. More preferably, it is 25 g / m ² or less.
The basis weight of the second layer (the layer forming the non-skin facing surface) constituting the laminated nonwoven fabric is preferably 10 g / m ² or more, more preferably 13 g / m ² or more, and preferably 40 g / m ² or less More preferably, it is 35 g / m ² or less.

Another embodiment of the present invention is shown in FIG. About the other embodiment mentioned below, a component different from diaper 1 mentioned above is mainly explained, the same component attaches the same numerals, and omits explanation. The description about the diaper 1 is applied suitably about the component part which is not demonstrated in particular.

The diaper 1 shown in FIG. 7 differs from the diaper 1 shown in FIGS. 1 to 5 in the arrangement of the leak-barrier cuffs 26 disposed on both sides along the longitudinal direction X in the skin facing surface of the absorbent main body 2 There is. Specifically, in the diaper 1 shown in FIG. 4, the other end of the leakproof cuff-forming sheet 27 in the lateral direction Y is a cuff main body fixing portion 291 on the non-skin facing surface of the back sheet 22 of the absorbent main body 2. A leak-barrier cuff 26 is formed, which is fixed, and one end of the sheet 27 stands up as a free end starting from the cuff main body fixing portion 291 by the contraction force of the cuff forming elastic member 28. As described above, the cuff main body fixing portion 291 of the leak-barrier cuff 26 is disposed between the back sheet 22 and the exterior body 3 and is located in the lateral direction Y more than the side edge along the longitudinal direction X of the absorber 23. It is distributed to people. On the other hand, in the diaper 1 shown in FIG. 7, the other end in the lateral direction Y of the leakproof cuff-forming sheet 27 is more lateral than the side edge along the longitudinal direction X of the absorber 23 on the skin facing surface of the surface sheet 21. The sheet 27 is fixed at a cuff main body fixing portion 291 disposed outward in the direction Y, and the contraction force of the cuff forming elastic member 28 causes the one end of the sheet 27 to be free end starting from the cuff main body fixing portion 291 The leak-barrier cuff 26 which stands up as a part is formed. As described above, the cuff main body fixing portion 291 of the leak-barrier cuff 26 is disposed on the skin-facing surface of the top sheet 21 and is more outward in the lateral direction Y than the side edge along the longitudinal direction X of the absorber 23. It is arranged. Also by the diaper 1 shown in FIG. 7, the same effect as the diaper 1 shown in FIGS. 1 to 5 is exerted.

As mentioned above, although this invention was demonstrated based on the embodiment, this invention can be suitably changed, without being restrict | limited to the said embodiment.
For example, in the diaper 1 described above, as shown in FIG. 2, the sweat-absorbent sheet 10 is provided on each of the ventral side F and the dorsal side R, but the sweat-absorbent sheet 10 is provided on at least the dorsal side R Just do it.

Moreover, in the above-mentioned diaper 1, as shown in FIG. 5, although the folding | returning part 31E of the outer-layer sheet 31 is used as a hydrophobic sheet which covers the back side edge part 2R of the absorptive main body 2, separate hydrophobicity You may use a sex sheet.

When the hydrophobic sheet is the folded portion 31E of the outer layer sheet 31 or a separate sheet, the form of the hydrophobic sheet is not particularly limited, and may be a nonwoven fabric having a single layer structure, and the third layer forming the skin opposing surface It may be a laminated nonwoven fabric having a laminated structure including the fourth layer forming the non-skin facing surface facing the top sheet 21. In the laminated nonwoven fabric, one or more other layers may be interposed between the third layer and the fourth layer. In the case of the non-woven fabric of the single layer structure, it may have a second fusion bonding part that fuses constituent fibers (thermoplastic fibers) with each other. In the case of the laminated non-woven fabric, the laminated non-woven fabric may have a second fusion bonding portion for fusing the respective layers to each other. Such a second fusion bonding portion is squeezing processing with a melt promoting means for promoting melting of constituent fibers (thermoplastic fibers) such as heat, ultrasonic waves, etc. Specifically, for example, heat seal processing, ultrasonic seal etc. Can be formed by applying to the constituent fibers.

When the hydrophobic sheet has the second fusion-bonded portion, the second fusion-bonded portion is formed on the surface sheet 21 of the hydrophobic sheet from the viewpoint of the adhesive property with the sweat absorbing sheet 10 and the surface sheet 21. It is preferable to arrange | position to the non-skin opposing surface which opposes. In the embodiment in which the second fusion-bonded portion is disposed on the non-skin opposing surface of the hydrophobic sheet, only the non-skin opposing surface of the hydrophobic sheet facing the non-skin opposing surface is disposed on the non-skin opposing surface side. In addition to the form, the form which is arranged on both the skin opposing surface and the non-skin opposing surface is also included. When the second fusion-bonded portion is disposed on both the skin-facing surface and the non-skin-facing surface, the depth of the depression of the second fusion-bonded portion is closer to the non-skin-facing surface than the skin-facing surface. Is preferably large.

Moreover, in the diaper 1, as shown in FIG. 2, although the exterior body 3 has comprised the continuous shape covering the belly side F, the crotch M, and the back side R, it replaces with this and the exterior body 3 It is a form divided into a ventral sheet member and a back sheet member, and absorptive main part 2 may be bridged and fixed to both sheet members.

Moreover, the disposable diaper of the present invention is not limited to the pants-type disposable diaper such as the diaper 1 described above, and can be applied to, for example, a developing disposable diaper.

Further, the following appendices will be disclosed regarding the embodiment of the present invention described above.

<1>
A disposable diaper comprising an absorbent main body including a surface sheet forming a skin-facing surface, and having a longitudinal direction corresponding to the longitudinal direction of the wearer and a lateral direction orthogonal to the longitudinal direction. The torso portion is disposed, and the torso portion is divided into a ventral side disposed on the ventral side of the wearer when worn and a dorsal side disposed on the dorsal side, at least the spine The side portion is disposed as a sheet constituting the back side, at the back end in the longitudinal direction of the absorbent main body, across the longitudinal direction, and at the skin-facing surface side of the absorbent main body. Hydrophobic sheet and a sweat-absorbing sheet disposed on the skin-facing side of the hydrophobic sheet, and bonding the sweat-absorbing sheet and the hydrophobic sheet in a region overlapping the absorbent main body in the thickness direction The bonding strength of the first bonding area is the same as the hydrophobic sheet and the surface. Greater than the bonding strength of the second bonding region are bonded and over preparative disposable diapers.

<2>
The disposable diaper according to <1>, wherein the distance between fibers of the surface sheet is larger than the distance between fibers of the sweat-absorbent sheet.
<3>
The disposable diaper according to <1> or <2>, wherein the surface sheet has an uneven shape on the surface facing the skin.
<4>
In the sweat-absorbent sheet, the longitudinally inner end is located at the same position as the longitudinally inner end of the hydrophobic sheet, or is positioned outward of the lengthwise direction than the inner end of the hydrophobic sheet. The disposable diaper according to any one of <1> to <3>.
<5>
The first bonding area is located at the same position as the longitudinal inner end of the second bonding area or inward of the inner end of the second bonding area. The disposable diaper according to any one of <1> to <4>.
<6>
The back side is formed with a stretchable area by an elastic member disposed in a state of being stretched in the lateral direction, and in the back side, the area where the hydrophobic sheet and the top sheet overlap in the thickness direction The regions at the same longitudinal position are a central portion where the absorbent body is located, and a pair of lateral portions located laterally outward from the side edges along the longitudinal direction of the absorbent body. The disposable diaper according to any one of <1> to <5>, wherein the central portion has a lower tensile stress in the lateral direction than each of the side portions.
<7>
The ratio of the lateral extension stress of each side portion to the lateral extension stress of the central portion (each side portion / central portion) is preferably 1.2 or more, more preferably 1.5 or more. And, Preferably the disposable diaper as described in said <6> which is 4.0 or less, More preferably, it is 3.5 or less.
<8>
The transverse tensile stress of the central portion is preferably 5 cN / mm or more, more preferably 7.5 cN / mm or more, and preferably 25 cN / mm or less, more preferably 20 cN / mm or less. The disposable diaper as described in 6> or <7>.
<9>
The transverse tensile stress of each of the side portions is preferably 2 cN / mm or more, more preferably 3 cN / mm or more, and preferably 15 cN / mm or less, more preferably 12 cN / mm or less. The disposable diaper any one of 6>-<8>.

<10>
The absorbent main body has leak-barrier cuffs on both sides along the longitudinal direction in the skin-facing surface of the absorbent body, and the bonding strength of the cuff-barrier region between the leak-barrier cuff and the hydrophobic sheet is The disposable diaper any one of said <1>-<9> larger than the joint strength of a said 2nd joining area | region.
<11>
The bonding strength of the cuff bonding area is preferably 1.5 times or more, more preferably 2.0 times or more, and further preferably 7.5 times or less of the bonding strength of the second bonding area. The disposable diaper according to <10>, which is preferably, and more preferably 5.0 times or less.
<12>
The bonding strength of the cuff bonding area is preferably 1.5 N / 25 mm or more, more preferably 2.0 N / 25 mm or more, and preferably 15 N / 25 mm or less, 10 N / 25 mm or less It is further preferable that it is the disposable diaper as described in said <10> or <11>.
<13>
The back end portion of the absorbent main body has a free end fixing portion in which the free end portion of the leak-barrier cuff is fixed on the skin facing surface of the top sheet, and the hydrophobic sheet is The leakproof cuff according to <10>, which extends to a region located inward in the longitudinal direction with respect to the laterally innermost free end fixing portion in the leakwise cuff and is joined to the leakproof cuff. Disposable diapers.

<14>
The disposable diaper according to any one of <1> to <13>, wherein the sweat-absorbent sheet is less hydrophilic on the side facing the skin than on the side facing the non-skin.
<15>
An exterior body disposed on the non-skin facing surface of the absorbent main body, including a laminate of an outer layer sheet forming the non-skin facing surface in the wearing state and an inner layer sheet disposed facing the skin facing surface of the outer layer sheet And the outer layer sheet extends from the longitudinal edge of the inner layer sheet to the ventral side and the back side, and has a hydrophobic folded portion folded back to the skin-facing side of the inner layer sheet. The disposable diaper according to any one of <1> to <14>, wherein the hydrophobic sheet covering the dorsal end of the absorbent main body comprises the folded portion of the outer layer sheet. .
<16>
The disposable diaper according to <15>, in which preferably, the longitudinally inner end of the sweat absorbent sheet is positioned outward of the vertical direction with respect to the inner end of the folded portion.

<17>
In the first bonding area bonding the sweat-absorbent sheet and the folded-back section, the longitudinal end of the second bonding area joins the folded-back section to the surface sheet, with the longitudinal inward end joining the folded-back section and the surface sheet. The disposable diaper according to <15> or <16>, which is more preferably positioned inward of the longitudinal direction than the inward end of the direction.
<18>
The absorbent main body includes a liquid-retaining absorbent body, and the laterally long sweat-absorbent sheet is provided with an absorbent body arrangement region in which the absorbent body is arranged at the back side, and the absorbent body. The disposable diaper any one of said <1>-<17> distribute | arranged over both with the absorber non-disposition area which is not carried out.
<19>
The bonding strength of the first bonding area is preferably 1.5 times or more, more preferably 2.0 times or more, and more preferably 7.5 times or less of the bonding strength of the second bonding area. The disposable diaper according to any one of <1> to <18>, which is preferably, and more preferably 5.0 times or less.
<20>
The bonding strength of the first bonding region is preferably 1.5 N / 25 mm or more, more preferably 2.0 N / 25 mm or more, and preferably 25 N / 25 mm or less, 20 N / 25 mm. The disposable diaper according to any one of <1> to <19>, which is more preferably the following.
<21>
The bonding strength of the second bonding region is preferably 0.5 N / 25 mm or more, more preferably 1.0 N / 25 mm or more, and preferably 3.0 N / 25 mm or less, 2 The disposable diaper according to any one of <1> to <20>, which is more preferably 5 N / 25 mm or less, and preferably 0.5 N / 25 mm or more and 3.0 N / 25 mm or less.

<22>
The difference between the inter-fiber distance of the surface sheet and the inter-fiber distance of the sweat-absorbent sheet is preferably 20 μm or more, more preferably 30 μm or more, and preferably 100 μm or less, more preferably 90 μm or less as the former and the latter. The disposable diaper according to any one of <1> to <21>.
<23>
The inter-fiber distance of the surface sheet is preferably 250 μm or less, more preferably 150 μm or less, and preferably 50 μm or more, and still more preferably 70 μm or more. The disposable diaper any one of <22>.
<24>
The inter-fiber distance of the sweat-absorbent sheet is preferably 150 μm or less, more preferably 90 μm or less, and preferably 5 μm or more, and further preferably 10 μm or more. The disposable diaper any one of <23>.
<25>
The surface sheet according to any one of <1> to <24>, wherein a plurality of convex portions are distributed in the form of a dispersed point over the entire skin-facing surface, and the periphery of each convex portion is a concave portion. Disposable diapers.
<26>
The contact angle between the skin-facing surface of the sweat absorbing sheet and the ion-exchanged water is preferably 90 ° or more, more preferably 100 ° or more, and preferably 150 ° or less, preferably 140 ° or less. It is further preferable that the disposable diaper according to any one of <1> to <25>.
<27>
The contact angle between the non-skin facing surface of the sweat absorbing sheet and the ion exchange water is preferably less than 90 °, more preferably 88 ° or less, particularly preferably 85 ° or less, and 35 ° The disposable diaper according to any one of <1> to <26>, which is preferably the above, and more preferably 40 ° or more.
<28>
The sweat-absorbent sheet has a fusion-bonded portion in which thermoplastic fibers are fused to each other, and the fusion-bonded portion is disposed on the skin-facing surface of the sweat-absorbent sheet. The disposable diaper any one of.
<29>
The hydrophobic sheet has a second fusion part in which thermoplastic fibers are fused to each other, and the second fusion part is disposed on the non-skin opposing surface of the hydrophobic sheet. The disposable diaper any one of <1>-<28>.
<30>
The absorbent body has a liquid-retaining absorbent core,
The disposable diaper according to any one of <1> to <29>, wherein the sweat absorbing sheet and the absorbent core overlap in the region where the sweat absorbing sheet and the absorbent main body overlap in the thickness direction. .
<31>
The disposable diaper any one of said <1>-<30> in which the thickness of the said surface sheet is larger than the thickness of the said sweat-absorbent sheet.
<32>
The difference between the thickness of the surface sheet and the thickness of the sweat absorbing sheet is preferably 0.8 mm or more, more preferably 1 mm or more, and preferably 4 mm or less, more preferably 3 mm or less as the former and the latter. The disposable diaper any one of <1>-<31>.
<33>
The thickness of the surface sheet is preferably 5 mm or less, more preferably 3 mm or less, and further preferably 0.2 mm or more, still more preferably 0.5 mm or more. The disposable diaper according to any one of> to <32>.
<34>
The thickness of the sweat-absorbent sheet is preferably 2 mm or less, more preferably 1 mm or less, and preferably 0.1 mm or more, and further preferably 0.2 mm or more. The disposable diaper any one of <-><33>.
<35>
The disposable diaper any one of said <1>-<34> in which the fiber diameter of the constituent fiber of the said surface sheet is larger than the fiber diameter of the constituent fiber of the said sweat absorption sheet.
<36>
The difference between the fiber diameter of the constituent fibers of the surface sheet and the fiber diameter of the constituent fibers of the sweat-absorbent sheet is preferably 2 μm or more, more preferably 3 μm or more, and preferably 10 μm or less, more preferably The disposable diaper any one of said <1>-<35> which is 8 micrometers or less.
<37>
The fiber diameter of the constituent fibers of the surface sheet is preferably 25 μm or less, more preferably 20 μm or less, and preferably 8 μm or more, and still more preferably 10 μm or more. The disposable diaper according to any one of> to <36>.
<38>
The fiber diameter of the constituent fibers of the sweat-absorbent sheet is preferably 20 μm or less, more preferably 18 μm or less, and preferably 1 μm or more, and still more preferably 5 μm or more. Disposable diaper according to any one of> to <37>.

According to the disposable diaper of the present invention, it is difficult for the sweat-absorbent sheet to be turned up during wearing, and skin problems caused by sweat are less likely to occur.

Claims

A disposable diaper comprising an absorbent main body including a surface sheet forming a skin-facing surface, and having a longitudinal direction corresponding to the longitudinal direction of the wearer and a lateral direction orthogonal to the longitudinal direction.
It has a waist portion which is disposed around the wearer's waist when worn, and the waist portion is composed of an abdominal side, which is disposed on the ventral side of the wearer when worn, and a dorsal side, which is disposed on the dorsal side. Classified and
At least the back side is disposed as a sheet constituting the back side across the lengthwise direction at the back side end in the longitudinal direction of the absorbent main body, and the skin facing surface side of the absorbent main body And a sweat absorbing sheet disposed on the skin-facing side of the hydrophobic sheet.
In a region overlapping the absorbent main body in the thickness direction, a bonding strength of a first bonding region bonding the sweat absorbent sheet and the hydrophobic sheet is bonding the hydrophobic sheet and the surface sheet. Disposable diapers that are greater than the bonding strength of the two bonding areas.
The disposable diaper according to claim 1, wherein the inter-fiber distance of the surface sheet is larger than the inter-fiber distance of the sweat-absorbent sheet.
The disposable diaper according to claim 1, wherein the surface sheet has an uneven shape on the surface facing the skin.
In the sweat-absorbent sheet, the longitudinally inner end is located at the same position as the longitudinally inner end of the hydrophobic sheet, or is positioned outward of the lengthwise direction than the inner end of the hydrophobic sheet. The disposable diaper according to any one of claims 1 to 3.
The first bonding area is located at the same position as the longitudinal inner end of the second bonding area or inward of the inner end of the second bonding area. The disposable diaper according to any one of claims 1 to 4.
An elastic region is formed on the back side by an elastic member disposed in the laterally extended state,
In the back side, the region where the hydrophobic sheet and the surface sheet overlap in the thickness direction and the region at the same position in the longitudinal direction is the central portion where the absorbent body is located, and the longitudinal direction of the absorbent body The side edges along each of the side walls and the pair of side portions located laterally outward;
The disposable diaper according to any one of claims 1 to 5, wherein the central portion has a lower tensile stress in the lateral direction than each of the side portions.
The disposable diaper according to claim 6, wherein a ratio of the lateral extension stress of each side portion to the lateral extension stress of the central portion is 1.2 or more and 4.0 or less.
The disposable diaper according to claim 6 or 7, wherein the tensile stress in the lateral direction of the central portion is 5 cN / mm or more and 25 cN / mm or less.
The disposable diaper according to any one of claims 6 to 8, wherein the tensile stress in the lateral direction of each side portion is 2 cN / mm or more and 15 cN / mm or less.
The absorbent main body has leak-barrier cuffs on both sides along the longitudinal direction on the skin-facing surface of the absorbent main body,
The disposable diaper according to any one of claims 1 to 9, wherein the joint strength of the cuff joint area between the leakproof cuff and the hydrophobic sheet is larger than the joint strength of the second joint area.
The disposable diaper according to claim 10, wherein the bonding strength of the cuff bonding area is not less than 1.5 times and not more than 7.5 times the bonding strength of the second bonding area.
The disposable diaper according to claim 10 or 11, wherein the joint strength of the cuff joint area is 1.5 N / 25 mm or more and 15 N / 25 mm or less.
The back end of the absorbent main body has a free end fixing part in which the free end of the leak-barrier cuff is fixed on the skin facing surface of the top sheet,
The hydrophobic sheet is joined to the leakproof cuff so as to extend to a region located longitudinally inward of the free end fixing portion disposed inward in the lateral direction in the leakproof cuff. The disposable diaper according to claim 10.
The disposable diaper according to any one of claims 1 to 13, wherein the sweat-absorbent sheet is less hydrophilic on the side facing the skin than on the side facing the non-skin.
An exterior body disposed on the non-skin facing surface of the absorbent main body, including a laminate of an outer layer sheet forming the non-skin facing surface in the wearing state and an inner layer sheet disposed facing the skin facing surface of the outer layer sheet Equipped with
The outer layer sheet has a hydrophobic folded portion extending from the longitudinal edge of the inner layer sheet to the ventral side and the back side, and folded back to the skin-facing side of the inner layer sheet Yes,
The disposable diaper according to any one of claims 1 to 14, wherein the hydrophobic sheet covering the back end of the absorbent main body comprises the folded portion of the outer layer sheet.
The disposable diaper according to claim 15, wherein the sweat-absorbent sheet is positioned such that the longitudinal inward end is outward in the longitudinal direction than the inward end of the folded portion.
In the first bonding area bonding the sweat-absorbent sheet and the folded-back section, the longitudinal end of the second bonding area joins the folded-back section and the top sheet in the longitudinal end. The disposable diaper according to claim 15 or 16, which is located inward of the longitudinal direction than the inward end of the direction.
The absorbent body comprises a liquid-retaining absorber,
The sweat-absorbent sheet is disposed on the back side, covering both the absorbent placement area where the absorbent is placed and the absorbent non-placed area where the absorbent is not placed. Item 18. The disposable diaper according to any one of Items 1 to 17.
The disposable diaper according to any one of claims 1 to 18, wherein the bonding strength of the first bonding area is 1.5 times or more and 7.5 times or less of the bonding strength of the second bonding area.
The disposable diaper according to any one of claims 1 to 19, wherein the bonding strength of the first bonding area is 1.5 N / 25 mm or more and 25 N / 25 mm or less.
The disposable diaper according to any one of claims 1 to 20, wherein a bonding strength of the second bonding area is 0.5 N / 25 mm or more and 3.0 N / 25 mm or less.
The disposable diaper according to any one of claims 1 to 21, wherein the difference between the inter-fiber distance of the surface sheet and the inter-fiber distance of the sweat-absorbent sheet is 20 μm or more and 100 μm or less as the former and the latter.
The disposable diaper according to any one of claims 1 to 22, wherein the inter-fiber distance of the surface sheet is 50 μm or more and 250 μm or less.
The disposable diaper according to any one of claims 1 to 23, wherein the inter-fiber distance of the sweat-absorbent sheet is 5 μm or more and 150 μm or less.
25. The disposable according to any one of claims 1 to 24, wherein the surface sheet has a plurality of convex portions distributed in the form of dispersed points all over the skin-facing surface, and the periphery of each convex portion is a concave portion. Diapers.
The disposable diaper according to any one of claims 1 to 25, wherein a contact angle between the skin facing surface of the sweat absorbing sheet and the ion exchange water is 90 ° or more and 150 ° or less.
The disposable diaper according to any one of claims 1 to 26, wherein the contact angle between the non-skin-facing surface of the sweat-absorbent sheet and the ion-exchanged water is 35 ° or more and less than 90 °.
28. The sweat-absorbent sheet according to any one of claims 1 to 27, wherein the sweat-absorbent sheet has a fusion-bonded portion in which thermoplastic fibers are fused to each other, and the fusion-bonded portion is disposed on the skin-facing surface of the sweat-absorbent sheet. The disposable diaper according to item 1.
The hydrophobic sheet has a second fusion part in which thermoplastic fibers are fused to each other, and the second fusion part is disposed on the non-skin opposing surface of the hydrophobic sheet. Item 28. The disposable diaper according to any one of Items 1 to 28.
The absorbent body has a liquid-retaining absorbent core,
The disposable diaper according to any one of claims 1 to 29, wherein the sweat absorbing sheet and the absorbent core overlap in a region where the sweat absorbing sheet and the absorbent main body overlap in the thickness direction.
The disposable diaper according to any one of claims 1 to 30, wherein the thickness of the top sheet is larger than the thickness of the sweat-absorbent sheet.
The disposable diaper according to any one of claims 1 to 31, wherein the difference between the thickness of the surface sheet and the thickness of the sweat-absorbent sheet is 0.8 mm or more and 4 mm or less as the former and the latter.
The disposable diaper according to any one of claims 1 to 32, wherein the thickness of the surface sheet is 0.2 mm or more and 5 mm or less.
The disposable diaper according to any one of claims 1 to 33, wherein a thickness of the sweat-absorbent sheet is 0.1 mm or more and 2 mm or less.
The disposable diaper according to any one of claims 1 to 34, wherein a fiber diameter of constituent fibers of the top sheet is larger than a fiber diameter of constituent fibers of the sweat-absorbent sheet.
The disposable according to any one of claims 1 to 35, wherein the difference between the fiber diameter of the constituent fibers of the surface sheet and the fiber diameter of the constituent fibers of the sweat-absorbent sheet is 2 μm or more and 10 μm or less as the former-latter. Diapers.
The disposable diaper according to any one of claims 1 to 36, wherein a fiber diameter of constituent fibers of the surface sheet is 8 μm or more and 25 μm or less.
The disposable diaper according to any one of claims 1 to 37, wherein a fiber diameter of constituent fibers of the sweat-absorbent sheet is 1 μm or more and 20 μm or less.