JP2017192533A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article in which the contractive force originally provided to an exterior body is hard to be lowered with time and the fitting properties are superior, in the absorbent article including an absorbing body and the exterior body fixed with this.SOLUTION: A bonding part 5 between an inner sheet 31 and an outer sheet 32 constituting an exterior body 3 makes linearity extending in the longitudinal direction X in a plan view, and multiple bonding parts 5 are intermittently disposed in the transverse direction Y. Longitudinal ends 240 of an absorbent core 24 are overlapped with the outer sheet 32 in a plan view, and a cut-out part 241 missed with a portion of a longitudinal edge 24X in the longitudinal ends 240 is provided. A portion between the inner sheet 31 and the outer sheet 32 is not bonded to each other in the overlapped portion with the cut-out part 241 in the plan view. Also, a portion between the inner sheet 31 and an absorbing body 2 is also not bonded in the overlapped portion to each other.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an absorbent article such as a disposable diaper.

  Conventionally, an absorbent main body having a liquid-retaining absorbent body and an exterior body disposed on the non-skin facing surface side of the absorbent main body, the exterior body being joined to the absorbent main body A disposable diaper having a laminated structure of an inner layer sheet and an outer layer sheet bonded to a non-skin facing surface of the inner layer sheet is known. As the exterior body, an elastic sheet having elasticity in the direction (lateral direction of the diaper) orthogonal to the front-rear direction (diaper vertical direction) of the wearer of the diaper is used from the viewpoint of improving the fit of the diaper. There is a case.

  For example, Patent Document 1 discloses that the outer layer sheet in the disposable diaper having the above-described configuration is an abdominal outer layer sheet disposed on the wearer's stomach when worn, an inseam outer layer sheet disposed on the wearer's crotch, A backside outer layer sheet disposed on the back side, and a stretchable sheet having stretchability in the lateral direction is used as the abdominal side outer layer sheet and the backside outer layer sheet, and the crotch outer layer sheet is non-stretchable The use of a sheet is described. Moreover, in patent document 1, in order to prevent those stretchability being suppressed too much by joining a ventral | abdominal outer layer sheet | seat and a back | dorsal outer layer sheet | seat with a non-stretchable inner layer sheet | seat, for those joining. It is described that the application amount of the adhesive to be used is reduced as compared with the application amount of the adhesive used for joining the crotch outer layer sheet and the inner layer sheet. The adhesive application pattern for joining the ventral outer layer sheet and the back outer layer sheet to the inner layer sheet is a pattern in which a plurality of linear adhesive application parts extending in the vertical direction in a plan view are intermittently arranged in the horizontal direction. In addition, it is described that the application pattern of the adhesive that joins the crotch outer layer sheet and the inner layer sheet is so-called solid coating in which the adhesive is applied to the entire area (see FIG. 5 of Patent Document 1).

  In addition, Patent Document 2 relates to the joining of the inner layer sheet and the outer layer sheet that constitute the outer package in the disposable diaper having the above-described configuration, or the entire region or most of the portion excluding the peripheral portions of the side seal, the waist opening, and the leg opening. Describes that both sheets are not joined. According to Patent Document 2, such a configuration can minimize the portion where the exterior body is hardened by the adhesive, and thus is not covered by the absorbent main body on the outer surface of the diaper or the skin facing surface of the exterior body. It is said that the portion can be made soft and soft.

  Further, in Patent Document 3, in the disposable diaper having the above-described configuration, the outer layer sheet and the inner layer sheet in each of the stomach side portion and the back side portion of the diaper are partially joined, and the crotch portion of the diaper is a diaper in the thickness direction. It is described that all the layers between the outer surface and the absorbent body are fully bonded. According to the diaper described in Patent Document 3, such a configuration hardly causes a shift between the absorbent main body and the sheet forming the outer surface of the diaper when the diaper is worn or during wearing. However, it is said that it is stably located in a part or the like facing the excretion part of the wearer, and good absorption performance as designed can be obtained.

JP 2009-90029 A JP 2008-36198 A JP 2008-228834 A

  In the disposable diaper as described in Patent Documents 1 to 3, since the outer body having elasticity in the lateral direction is fixed to the absorbent main body in the laterally extended state, the outer body is laterally moved by the outer body during wearing of the diaper. A contractile force acts on the abdomen, thereby providing good fit to the abdomen and the dorsal part, and preventing the absorbent main body from shifting, so that excellent absorption performance can be stably expressed. However, since the absorbent main body fixed to the exterior body is usually non-stretchable and does not have a contraction force in the lateral direction, the absorbent body prevents the exterior body from contracting in the lateral direction. Therefore, the lateral contraction force of the exterior body decreases with time, and as a result, there is a possibility that inconveniences such as a fit of the diaper and a decrease in wearing feeling may occur.

  Accordingly, an object of the present invention is to provide an absorbent article having a good fit and an absorbent article having an absorbent main body and an exterior body to which the absorbent body is fixed, in which the shrinkage force inherent in the exterior body is unlikely to decrease over time. About providing.

  The present invention comprises an absorbent main body comprising an absorbent core containing an absorbent material, and an exterior body arranged on the non-skin facing surface side of the absorbent main body to fix the absorbent main body, An absorbent article having a longitudinal direction corresponding to a wearer's front-rear direction and a transverse direction orthogonal thereto, wherein the exterior body is joined to the absorbent main body and the inner layer sheet. The outer layer sheet having stretchability in the lateral direction, and is fixed to the absorbent main body in a stretched state in the lateral direction, and the joint between the inner layer sheet and the outer layer sheet is in plan view A linear shape extending in the vertical direction is formed, and a plurality of the joint portions are intermittently arranged in the horizontal direction, and a vertical end portion of the absorbent core overlaps with the outer layer sheet in a plan view and the vertical direction Has a notch with a part of the longitudinal edge at the end missing Between the inner layer sheet and the outer layer sheet are not joined to each other at the overlapping portion with the notch portion in plan view, and between the inner layer sheet and the absorbent main body at the overlapping portion. Absorbent articles that are not joined together are provided.

  ADVANTAGE OF THE INVENTION According to this invention, in the absorbent article provided with the absorptive main body and the exterior body to which this was fixed, the shrinkable force which the exterior body originally has is hard to fall with time, and an absorbent article with favorable fitting property is provided. Is done.

FIG. 1 is a perspective view schematically showing a pants-type disposable diaper that is an embodiment of the absorbent article of the present invention. FIG. 2 is a developed plan view schematically showing the skin facing surface side (inner surface side) in the developed and extended state of the diaper shown in FIG. FIG. 3 is an exploded perspective view schematically showing the diaper shown in FIG. 1 in an exploded manner. FIG. 4 is a cross-sectional view schematically showing a cross section taken along line II of FIG. FIG. 5 is a partially broken perspective view schematically showing an example of a part of the outer layer sheet (abdominal outer layer sheet) constituting the outer package of the diaper shown in FIG. 1. 6 is a cross-sectional view schematically showing a cross section taken along line II of FIG. 2 in the natural state or wearing state of the diaper shown in FIG. FIG. 7 is a diagram showing a schematic configuration of an example of a diaper outside the scope of the present invention. FIG. 7A is a schematic plan view of one end side of the diaper in the vertical direction, and FIG. FIG. 8 is a transverse sectional view schematically showing a section taken along line II-II in FIG. FIG. 8 is a diagram showing a schematic configuration of another example of a diaper outside the scope of the present invention, and FIG. 8 (a) is a schematic plan view of one longitudinal end side of the diaper, and FIG. 8 (b). These are the cross-sectional views which show typically the III-III line cross section of Fig.8 (a).

  The present invention will be described below based on preferred embodiments with reference to the drawings. The pants type disposable diaper 1 which is one Embodiment of the absorbent article of this invention is shown by FIGS. 1-4. The diaper 1 has a longitudinal direction X corresponding to the wearer's front-rear direction and a transverse direction Y perpendicular thereto, and is disposed on the non-skin facing surface side of the absorbent main body 2 and the absorbent main body 2. An outer body 3 that fixes the absorbent main body 2, and both side edges FS and RS along the longitudinal direction X of the outer body 3 in each of the front body 1 </ b> F and the rear body 1 </ b> R are joined together to form a pair of sides Seal portions S, S, a waist opening WH through which the wearer's torso is passed, and a pair of leg openings LH, LH through which the lower leg of the wearer is passed are formed.

  As shown in FIG. 2, the front body 1 </ b> F is a portion that covers the front side (abdominal side) of the wearer's body at the time of wearing, with the diaper 1 being divided into the vertical direction X and the vertical center line CLx extending in the horizontal direction Y as a reference. The back body 1R is a portion that covers the back side (back side) of the wearer's body. Further, in this specification, the “skin-opposing surface” is a surface of the absorbent article or a constituent member thereof (for example, an absorbent main body) that is directed to the skin side of the wearer when the absorbent article is worn, that is, a relatively wearer. The “non-skin-facing surface” is the side close to the skin of the absorbent article or a component of the absorbent article or the component thereof, on the opposite side to the skin side when the absorbent article is worn, that is, on the side far from the wearer's skin. It is the surface that is directed. In addition, "at the time of wearing" here means a state where a normal proper wearing position, that is, a correct wearing position of the absorbent article is maintained, and the absorbent article is in a state of being deviated from the wearing position. Is not included.

  The diaper 1 includes an abdominal side portion 1A disposed on the abdomen side of the wearer in a worn state, a back side portion 1C disposed on the back side, and a crotch portion positioned between them and disposed on the crotch portion of the wearer. 1B. The longitudinal direction X of the diaper 1 is a direction extending between the front body 1F and the back body 1R, that is, a direction extending between the abdomen 1A and the back 1C via the crotch 1B, and absorbs It coincides with the longitudinal direction of the main body 2. The ventral part 1A is a part of the front body 1F, the back part 1C is a part of the back body 1R, and the crotch part 1B extends over the front body 1F and the back body 1R. The abdominal side portion 1A and the back side portion 1C are portions that are in the same position as the side seal portion S in the longitudinal direction X, and are waist portions that are arranged around the wearer's waist when the diaper 1 is worn. The crotch portion 1 </ b> B is a region in which recesses for forming leg openings LH and LH are formed at both side edges along the longitudinal direction X of the exterior body 3. The crotch part 1B has an excretion part facing part that is disposed to face the excretion part of the wearer when the diaper 1 is worn, and the excretion part facing part is usually a central part (vertical center) of the diaper 1 in the longitudinal direction X. (On line CLx) or in the vicinity thereof.

  The absorptive main body 2 has a rectangular shape in plan view as shown by the outline in FIG. 2, and the longitudinal direction of the absorbent main body 2 is unfolded and coincides with the longitudinal direction X of the diaper 1 in the expanded state. And is joined to the exterior body 3 via the joint 4. The outer package 3 forms the outer shape of the diaper 1 in the unfolded and extended state of the diaper 1 as shown in FIG. 2, and the peripheral edge of the outer package 3 forms the outline of the diaper 1 in that state. The “expanded and extended state” of the diaper 1 means that the diaper 1 is separated by the side seal portion S to be in the expanded state, and the expanded diaper 1 is stretched by the elastic member of each part to design dimensions (the influence of the elastic member is not at all). It means a state in which it is expanded until it becomes the same size as when it is expanded in a flat state in the excluded state.

  As shown in FIG. 4, the absorbent main body 2 includes a liquid-permeable surface sheet 21 that forms a skin-facing surface, and a liquid-impermeable or liquid-permeable or water-repellent back sheet 22 that forms a non-skin-facing surface. And a liquid-retaining absorbent 23 interposed between the two sheets 21 and 22, which are integrated by a known joining means such as an adhesive. The absorber 23 is located in the center part of the horizontal direction Y of the diaper 1 (exterior body 3). As the top sheet 21 and the back sheet 22, various types conventionally used for this type of absorbent article can be used without particular limitation. For example, various nonwoven fabrics or apertured films can be used as the top sheet 21, and a resin film, a laminate of a resin film and a nonwoven fabric, or the like can be used as the back sheet 22.

  The absorbent body 23 has a substantially rectangular shape in the longitudinal direction X in a plan view as shown in FIG. 2, and extends from the ventral side 1A to the dorsal side 1C. The absorbent body 23 includes a liquid-retaining absorbent core 24 containing an absorbent material, and a core wrap sheet 25 that covers the skin facing surface and the non-skin facing surface of the absorbent core 24. The absorbent core 24 and the core wrap sheet 25 are joined by a known joining means such as a hot-melt adhesive.

  The absorbent core 24 has a single-layer structure, and is formed by stacking a core forming material including an absorbent material. As the absorbent material, those normally used as a material for forming this type of absorbent core can be used without any particular limitation. For example, hydrophilic fibers such as wood pulp, synthetic fibers treated with a hydrophilizing agent, and water absorption Include polymer particles. In other words, the absorbent core 24 can be a hydrophilic fiber stack, or a structure in which water-absorbing polymer particles are supported on the stack. As the core wrap sheet 25, a water-permeable sheet material can be used, and for example, paper, nonwoven fabric, or the like can be used.

  As shown in FIGS. 2 to 4, the left and right side portions along the longitudinal direction X on the skin-facing surface of the absorbent main body 2 are provided with a pair of liquid-resistant or water-repellent and breathable sheet materials. Leakage cuffs 28, 28 are provided. In the vicinity of the free end of each leak-proof cuff 28, one or more elastic members 29 for forming a leak-proof cuff are arranged in an extended state (one in this embodiment). The leak-proof cuff 28 stands up at least at the crotch portion 1B when the elastic member 29 arranged in the stretched state contracts when the diaper 1 is worn, and thereby the outflow of excretion fluid such as urine outward in the lateral direction Y. To prevent.

  As shown in FIG. 2, the exterior body 3 includes an abdominal side 1 </ b> A that is a waist part of the front body 1 </ b> F, a back side part 1 </ b> C that is a waist part of the back body 1 </ b> R, an abdominal side part 1 </ b> A, and a back side part 1 </ b> C. It is arranged over the crotch part 1B sandwiched, and both side edges along the longitudinal direction X are curved inwardly in the crotch part 1B to form a pair of leg edges, as shown in FIG. In a plan view, the central region in the vertical direction X has an hourglass shape that is bound inward in the horizontal direction Y. The exterior body 3 has both side edges FS, FS along the longitudinal direction X in the front body 1F (abdominal side 1A) and both side edges RS, RS along the longitudinal direction X in the back body 1R (back side 1C). Are joined together by a known joining means such as an adhesive, heat seal, ultrasonic seal, etc., and as a result of the joining, as shown in FIG. 1, a pair of side seal portions S, S is formed on the diaper 1. A waist opening WH and a pair of leg openings LH, LH are formed.

  As shown in FIGS. 3 and 4, the exterior body 3 includes a laminated body of an inner layer sheet 31 joined to the absorbent main body 2 and an outer layer sheet 32 joined to the inner layer sheet 31. In the wearing state of the diaper 1, the inner layer sheet 31 is positioned on the side close to the wearer's body to form the skin facing surface (inner surface) of the diaper 1, and the outer layer sheet 32 is positioned on the side far from the wearer's body. The non-skin facing surface (outer surface) of the diaper 1 is formed. The inner layer sheet 31 and the outer layer sheet 32 are bonded to each other through the bonding portion 5 at a predetermined portion.

The exterior body 3 includes a waist elastic member 33 that forms a waist gather at the opening edge of the waist opening WH. That is, one or a plurality of waist elastic members 33 for forming waist gathers (in the present embodiment, a plurality of waist elastic members 33) in the lateral direction of the waist edge WH of the waist opening WH in each of the ventral side A and the back side C. It is arranged in an extended state over the entire length of Y, whereby an annular waist gather that is substantially continuous over the entire circumference is formed in the waist opening WH.
Furthermore, the exterior body 3 is a leg elastic member that forms leg gathers at the opening edge of each of the pair of leg openings LH and LH, and is one or a plurality (in this embodiment) arranged in an extended state on the front body 1F. A plurality of front leg elastic members 34 and one or a plurality (in the present embodiment, a plurality) rear leg elastic members 35 arranged in an extended state on the back body 1R.
The waist elastic member 33 and the leg elastic members 34 and 35 each have a thread shape or a belt shape, and are sandwiched and fixed by an adhesive between the inner layer sheet 31 and the outer layer sheet 32 constituting the exterior body 3.

  In the present embodiment, as shown in FIG. 3, the inner layer sheet 31 is composed of a single continuous sheet, whereas the outer layer sheet 32 is composed of a combination of a plurality of sheets. It includes a ventral outer layer sheet 32A constituting the side part 1A, a back outer layer sheet 32C constituting the back side part 1C, and a crotch outer layer sheet 32B constituting the crotch part 1B located between the sheets 31A and 31C. It consists of Each of the sheets 31A, 31B, 31C constituting the outer layer sheet 32 is overlapped with the end portions in the longitudinal direction X, and a known joint such as an adhesive, heat seal, high frequency seal, ultrasonic seal, etc. is overlapped at the overlap portion. They are joined and integrated by means. In the overlapping portion of the sheets 31A and 31C and the sheet 31B, the sheet 31B located in the center of the longitudinal direction X is located on the side relatively close to the absorbent main body 2, and both ends of the sheet 31B in the longitudinal direction X The non-skin facing surface of the part is covered with sheets 31A and 31C.

  As shown in FIGS. 2 and 3, the ventral outer layer sheet 32 </ b> A has a ventral extension portion 32 </ b> AE that extends outward from the end in the longitudinal direction X on the ventral portion 1 </ b> A side of the inner layer sheet 31. Further, the back side outer layer sheet 32C has a back side extending part 32CE extending outward from the end in the longitudinal direction X on the back side part 1C side of the inner layer sheet 31, and both extending parts 32AE, 32CE is folded back to the inner layer sheet 31 side so as to cover both ends in the longitudinal direction X of the absorbent main body 2 arranged and fixed on the inner layer sheet 31, and both extended portions 32AE, 32CE and It is being fixed to the other structural member (the inner layer sheet | seat 31, the absorptive main body 2, the leak-proof cuff 28) of the diaper 1 which opposes.

  The outer layer sheet 32 has elasticity in the lateral direction Y. In the present embodiment, the outer layer sheet 32 is partially stretchable in the lateral direction Y. That is, in the present embodiment, among the three sheets 32A, 32B, and 32C constituting the outer layer sheet 32, the ventral outer layer sheet 32A and the back outer layer sheet 32C have elasticity in the lateral direction Y, and the crotch outer layer sheet 32B does not have stretchability and is non-stretchable. In the present embodiment, the inner layer sheet 31 also has no stretchability and is not stretchable.

  In the present invention, “the sheet has elasticity in a predetermined direction (for example, the lateral direction)” means that the maximum elongation of the sheet in the predetermined direction is 100% or more, and the sheet is expanded in the predetermined direction. It means that the elongation recovery rate (elongation recovery rate at 100% elongation) when stretched to 100% and then contracted is at least 70% or more.

  The ventral outer layer sheet 32 </ b> A and the back outer layer sheet 32 </ b> C that are stretchable in the lateral direction Y can be extended more in the lateral direction Y than in the longitudinal direction X. More specifically, both the sheets 32A and 32C extend greatly in the lateral direction Y and contract after expansion (maximum elongation of 100% or more and elongation recovery rate of 70% or more), but in the longitudinal direction X, respectively. , Elongate only slightly (for example, maximum elongation of 50% or less). The elongation recovery rate of the sheet is measured by the following measuring method.

<Measurement method of elongation recovery rate>
A sample piece having a length of 50 mm and a width of 25 mm is prepared from the sheet to be measured. A sample piece is fixed between chucks (chuck interval K0) of a tensile tester (Orientec Co., Ltd. “Tensilon” RTC-1150A), and the sample piece is pulled by expanding the gap between the chucks at a tensile speed of 300 mm / min. After extending to the length K2 (= K0 × 2) at the time of 100% elongation, the gap between the chucks is narrowed at the same speed as the tensile speed, and the length of the sample piece when the tensile stress becomes zero is obtained. The length is K1 after recovery from elongation. The elongation recovery rate at the time of 100% elongation of the sheet to be measured is calculated by the following formula.
Elongation recovery rate at 100% elongation (%) = [(K2−K1) / (K2−K0)] × 100

  In the present invention, the non-stretchable sheet means a sheet having an elongation recovery rate measured by the above <Method for measuring elongation recovery rate> of 20% or less, or a sheet that breaks before 100% elongation. In the present embodiment, the crotch outer layer sheet 32B and the inner layer sheet 31 are both non-stretchable sheets.

  As described above, in the present embodiment, the abdominal outer layer sheet 32A and the back outer layer sheet 32C have stretchability, whereas the crotch outer layer sheet 32B and the inner layer sheet 31 do not have stretchability. Non-stretchable. The non-stretchable sheets 31B and 32 preferably do not have stretchability in the vertical direction X or the horizontal direction Y, and preferably do not have stretchability in both the directions X and Y.

  In the exterior body 3, the outer layer sheet 32 in which only a part (the abdominal part 1 </ b> A and the back part 1 </ b> C) is stretchable and the inner layer sheet 31 that is not stretchable as a whole are parts having the stretchability of the outer layer sheet 32 ( Under the extended state of the seats 32A and 32C), they are joined to each other on the opposite surfaces. Therefore, the exterior body 3 as a whole has a stomach side portion A and a back side portion C (the waistline) in which the seats 32A and 32C are disposed. Part) is stretchable in at least the stretchable direction of both the sheets 31A and 31C, that is, in the lateral direction Y, and the other part, that is, the crotch part B is not stretchable. The outer body 3, more specifically, the portion of the outer body 3 where the ventral outer layer sheet 32 </ b> A and the back outer layer sheet 32 </ b> C are arranged is fixed to the absorbent main body 2 in a state of extending in the lateral direction Y. ing.

  As the ventral outer layer sheet 32A and the back outer layer sheet 32C having elasticity, for example, (1) an elastic sheet in which stretchable fiber layers are integrated on both sides or one side of an elastic fiber layer, and (2) a net shape Elastic sheet in which stretchable fiber layers are integrated on both sides or one side of the elastic sheet, (3) Elasticity in which stretchable fiber layers are integrated on both sides or one side of an elastic sheet Sheet, (4) a stretchable sheet in which a large number of elastic filaments arranged so as to extend in one direction without crossing each other are bonded to a stretchable nonwoven fabric over their entire length in a substantially non-stretched state, etc. Can be preferably used. Examples of the method of integrating the elastic fiber layer and the extensible fiber layer include, for example, laminating them and hydroentangled them, or entangled fibers by air-through, etc., heat embossing, adhesive, ultrasonic bonding, etc. The method of letting it be mentioned.

  FIG. 5 shows a preferred example of the stretchable ventral outer layer sheet 32A. The ventral outer layer sheet 32A shown in FIG. 5 corresponds to the stretchable sheet of (4) above, and has a configuration in which thread-like elastic filaments are joined to one surface of an extensible fiber layer mainly composed of non-elastic fibers. The fiber layer 36 includes two fiber sheets 36 and 37, and an elastic member 38 as the elastic filament disposed between the sheets 36 and 37. The stretchable ventral outer layer sheet 32A having such a configuration can be manufactured, for example, according to the method described in JP-A-2009-61743. The stretchable backside outer layer sheet 32C can also be configured in the same manner as the stretchable ventral side outer layer sheet 32A shown in FIG.

  The two sheets 36 and 37 constituting the ventral outer layer sheet 32A are both extensible. The sheets 36 and 37 can be extended in the same direction as the direction in which the elastic member 38 extends (lateral direction Y). Stretchable means (a) when the constituent fibers themselves of the sheets 36 and 37 are stretched, and (b) even if the constituent fibers themselves do not stretch, This includes the case where the three-dimensional structure formed by a plurality of fibers is structurally changed due to bonding or the like, or the constituent fibers are broken, and the sheets 36 and 37 are extended as a whole.

  The elastic member 38 constituting the ventral outer layer sheet 32A is an elastic filament formed by being stretched in a state where the elastic resin is melted or softened. Each of the plurality of elastic members 38 is substantially continuous over the entire length of the sheet 32A (the total length in the lateral direction Y of the exterior body 3). The plurality of elastic members 38 are arranged so as to extend in one direction (lateral direction Y) without crossing each other. The elastic member 38 is joined to the two sheets 36 and 37 in a substantially non-extended state. The elastic member 38 is joined to the sheets 36 and 37 in the sheet 32A by fusing the elastic members 38 with the fibers (non-elastic fibers) constituting the sheets 36 and 37 buried in the elastic members 38. However, it is not made using an adhesive such as a hot-melt adhesive. Therefore, there is no adhesive between the sheets 36 and 37 (extensible fiber layer mainly composed of non-elastic fibers) and the elastic member 38 bonded thereto.

  The ventral outer layer sheet 32A can be expanded and contracted in the same direction as the direction in which the elastic member 38 extends (lateral direction Y). The stretchability of the sheet 32 </ b> A appears due to the elasticity of the elastic member 38. When the sheet 32A is stretched in the same direction as the elastic member 38 extends, the elastic member 38 and the sheets 36 and 37 extend. When the stretching of the sheet 32A is released, the elastic member 38 contracts, and the sheets 36 and 37 return to the state before the stretching with the contraction. Further, in the sheet 32A, there is no other elastic member coupled in a state orthogonal to the elastic member 38, so the sheet 32A is stretched in the same direction as the direction in which the elastic member 38 extends (lateral direction Y). When this occurs, the sheet 32A expands with almost no so-called width contraction contracting in the lateral direction Y.

  Each of the two sheets 36 and 37 constituting the ventral outer layer sheet 32A may be a short fiber nonwoven fabric. Examples of the nonwoven fabric include air-through nonwoven fabric, heat roll nonwoven fabric, spunlace nonwoven fabric, spunbond nonwoven fabric, and meltblown nonwoven fabric. The sheet 36 and the sheet 37 may be the same type or different types. As used herein, the “same type of sheet” means sheets having the same manufacturing process, types of constituent fibers of the sheet, fiber diameters and lengths of the constituent fibers, sheet thickness, basis weight, and the like. . If at least one of these is different, it is a “dissimilar sheet”.

  The elastic member 38 (elastic filament) constituting the ventral outer layer sheet 32A is made of, for example, a thermoplastic elastomer or rubber. In particular, when a thermoplastic elastomer is used as a raw material, it is possible to perform melt spinning using an extruder in the same manner as a normal thermoplastic resin, and the elastic filament thus obtained is easily heat-sealed. It is suitable for. Examples of the thermoplastic elastomer include styrene such as SBS (styrene-butadiene-styrene), SIS (styrene-isoprene-styrene), SEBS (styrene-ethylene-butadiene-styrene), and SEPS (styrene-ethylene-propylene-styrene). -Based elastomers, olefin-based elastomers (ethylene-based α-olefin elastomers, propylene-based elastomers copolymerized with ethylene, butene, octene, etc.), polyester-based elastomers, polyurethane-based elastomers, and the like. Two or more kinds can be used in combination. Further, core-sheath type or side-by-side type composite fibers made of these resins can also be used.

  On the other hand, as the non-stretch crotch outer layer sheet 32B and the inner layer sheet 31, nonwoven fabrics produced by various production methods are preferably used, for example, spunbond nonwoven fabric, air-through nonwoven fabric, needle punch nonwoven fabric, and the like. As a constituent fiber of the nonwoven fabric used as the non-stretchable sheets 31B and 32, for example, a fiber made of polyester such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyamide, or the like Etc. The fibers constituting the nonwoven fabric used as the non-stretchable sheets 32B and 31 may be short fibers or long fibers, and may be hydrophilic or water repellent. Moreover, a core-sheath type or side-by-side type composite fiber, a split fiber, a modified cross-section fiber, a crimped fiber, a heat-shrinkable fiber, or the like can also be used. These fibers can be used alone or in combination of two or more.

  As described above, in the diaper 1 of the present embodiment, the outer package 3 is joined to the absorbent main body 2 and the outer layer sheet 31 is joined to the inner layer sheet 31 and has elasticity in the lateral direction Y. 32, the exterior body 3 as a whole has stretchability in the lateral direction Y, and the stretchable exterior body 3 is stretched in the lateral direction Y to the absorbent main body 2. When fixed, such a configuration has a concern that the shrinkage force in the lateral direction Y of the exterior body 3 decreases with time, as described above.

On the other hand, in the diaper 1 of this embodiment, such a concern is wiped out by satisfy | filling all the following (A)-(C).
(A) The joint portion 5 between the inner layer sheet 31 and the outer layer sheet 32 (32A, 32C) has a linear shape extending in the longitudinal direction X in plan view, and the plurality of joint portions 5 are intermittently arranged in the lateral direction Y. ing.
(B) The longitudinal end portion 240 of the absorbent core 24 overlaps with the outer layer sheet 32 (32A, 32C) in plan view, and a notch portion 241 in which a part of the longitudinal end 24X in the longitudinal end portion 240 is missing. have.
(C) The inner layer sheet 31 and the outer layer sheet 32 (32A, 32C) are not joined to each other at the overlapping portion with the notch 241 in plan view, and the inner layer sheet 31 and the absorbent main body 2 Also, the overlapping portions are not joined to each other.

  With respect to (A), in the present embodiment, as shown in FIGS. 2 and 3, the joint 5 has a straight line shape in plan view extending in the longitudinal direction X, and the inner layer sheet 31, the ventral outer layer sheet 32 </ b> A, and the back outer layer sheet. Between each of the 32Cs, a plurality of, specifically, four joint portions 5 are arranged at a predetermined interval in the lateral direction Y. In each of the ventral side portion 1A and the dorsal side portion 1C, a part (two in this embodiment) of the joint portions 5 existing in the central portion in the lateral direction Y is formed laterally with the absorbent main body 2. At the same position in the direction Y, in the plan view as shown in FIG. 2, the end portions on the inner side in the longitudinal direction X of some of the joint portions 5 overlap the absorbent main body 2. In each of the ventral side portion 1A and the dorsal side portion 1C, the plurality of joint portions 5 include a horizontal center line (not shown) extending in the vertical direction X by dividing the diaper 1 into the horizontal direction Y (virtual straight line orthogonal to the vertical center line CLx). Are formed symmetrically with reference to The joining part 5 can be formed by well-known joining means, such as adhesives, such as a hot-melt-type adhesive agent, and a heat seal. The joint portion 5 in the present embodiment is formed by applying an adhesive and is an adhesive application portion.

Regarding (B), in this embodiment, as shown in FIG. 4, the notch 241 is a through hole (that is, the basis weight is zero) in which no core forming material is present. However, in the cutout portion according to the present invention, in addition to the shape of the through hole like the cutout portion 241, a smaller amount of core (specifically, about 10 g / m ² ) than the other region of the absorbent core. A form in which the forming material is slightly present is also included. The longitudinal end portion 240 of the absorbent core 24 is a portion including the longitudinal end 24X that forms a part of the outline of the absorbent core 24 and the vicinity thereof.

  In the present embodiment, the notch portion 241 is located on the outermost side in the longitudinal direction X of each of the longitudinal end portions 240 and 240 of the absorbent core 24, and one in the central portion in the lateral direction Y at the outermost position. Exist. Each notch 241 has a triangular shape in a plan view as shown in FIG. 2, and the length or width in the horizontal direction Y gradually decreases inward in the vertical direction X.

  Regarding (C), in the present embodiment, as shown in FIGS. 2 to 4, between the inner layer sheet 31 and the ventral outer layer sheet 32 </ b> A and the back outer layer sheet 32 </ b> C, there are joint portions other than the joint portion 5. Further, since the joint portion 5 does not overlap the notch portion 241 in a plan view as shown in FIG. 2, the inner layer sheet 31, the ventral outer layer sheet 32A, and the back outer layer sheet 32C are notched portions. The portions corresponding to 241 are not joined to each other.

  Regarding (C), in the present embodiment, as shown in FIGS. 2 to 4, there is a joint other than the joint 4 between the inner layer sheet 31 (exterior body 3) and the absorbent main body 2. In addition, since the joint portion 4 does not overlap with the notch portion 241 in a plan view as shown in FIG. 2, the inner layer sheet 31 (exterior body 3) and the absorbent main body 2 correspond to the notch portion 241. They are not joined to each other.

  In the present embodiment, as shown in FIGS. 2 and 3, the joint portions 4 have a straight line shape in plan view extending in the longitudinal direction X, and a pair is arranged along both side portions along the longitudinal direction X of the absorbent main body 2. Yes. The pair of joint portions 4 and 4 overlap with the joint portion 5 disposed between the inner layer sheet 31 and the outer layer sheet 32 (32A, 32C) in a plan view as shown in FIG. The length or width in the lateral direction Y of the joint portion 5 is smaller than the length or width in the lateral direction Y of the joint portion 4 overlapping in plan view. The joint portion 4 can be formed by a known joining means such as an adhesive such as a hot-melt adhesive or a heat seal. The joint portion 4 in the present embodiment is formed by applying an adhesive and is an adhesive application portion.

  Since the diaper 1 of the present embodiment satisfies all of the above (A) to (C), the exterior body 3 that is fixed to the absorbent main body 2 via the joint portion 4 in a state of extending in the lateral direction Y is a diaper. In the natural state 1 or wearing state, the contraction in the lateral direction Y is not completely hindered and can be contracted in the lateral direction Y. That is, in order for the exterior body 3 to shrink in the lateral direction Y in the natural state or wearing state of the diaper 1, the joint 4 with the absorbent main body 2 and the sheets 31, 32 constituting the exterior body 3 are not connected. The joint 5 is intermittently arranged in the lateral direction Y so as to satisfy the above (A) and (C), and the wrinkles generated in the exterior body 3 when the exterior body 3 contracts in the lateral direction Y. In the diaper 1 of the present embodiment, in addition to the above (A) and (C), the above (B) is further adopted, and the vertical end 240 of the absorbent core 24 In the natural state or wearing state of the diaper 1, the exterior body 3 can be contracted in the lateral direction Y as shown in FIG. Wrinkles generated by the shrinkage (absorption in the exterior body 3 Sex body raised portion 2 side), may enter the non-skin facing side to the notches 241. In particular, in the diaper 1 of the present embodiment, the notch portion 241 is arranged corresponding to the central portion in the lateral direction Y, which is the site where wrinkles due to the shrinkage in the lateral direction Y of the exterior body 3 are most likely to occur. Therefore, the outer casing 3 can be further contracted.

  On the other hand, for example, as shown in FIG. 7, the joint portion 5 is arranged in substantially the entire area between the inner layer sheet 31 and the outer layer sheet 32, and the joint portion 4 is between the inner layer sheet 31 and the absorbent main body 2. When the adhesive forming the joints 4 and 5 is solidly applied in the region, the notch portion 241 is formed in the longitudinal end portion 240 of the absorbent core 24. Even in this case, the shrinkage in the lateral direction Y of the outer package 3 is completely hindered, so that the outer package 3 is fixed in an expanded state, and the shrinkage force inherent in the outer package 3 decreases with time. Will do.

  For example, as shown in FIG. 7, when the cutout portion 241 is not formed in the longitudinal end portion 240 of the absorbent core 24, the joint portions 4 and 5 are formed in the lateral direction Y as in the diaper 1. Even if they are arranged intermittently, the shrinkage in the lateral direction Y of the outer package 3 is completely hindered, so that the outer package 3 is fixed in an expanded state, and the shrinkage force that the outer package 3 originally has Will decrease over time.

From the viewpoint of more surely exhibiting the above-described effects obtained by the diaper 1 of the present embodiment, it is preferable to set the dimensions and the like of each part as follows.
The total area of the joint portion 4 (that is, the total value of the areas of the plurality of joint portions 4) with respect to the area of the overlapping region between the absorbent main body 2 and the inner layer sheet 31 (that is, the area of the non-skin facing surface of the absorbent main body 2) The ratio as the latter / the former is preferably 0.2 or more, more preferably 0.3 or more, and preferably 0.6 or less, more preferably 0.5 or less.
The ratio of the length in the longitudinal direction X of the joint 4 to the total length in the longitudinal direction X of the absorbent main body 2 is preferably 0.6 or more, more preferably 0.65 or more, and preferably 0 as the latter / the former. .95 or less, more preferably 0.9 or less. In the present embodiment, as shown in the figure, the joint 4 is continuous over substantially the entire length of the absorbent main body 2.
The length or width in the lateral direction Y of the joint 4 is preferably 10 mm or more, more preferably 20 mm or more, and preferably 60 mm or less, more preferably 50 mm or less.

The length or width in the lateral direction Y of the joint 5 is preferably 5 mm or more, more preferably 7 mm or more, and preferably 40 mm or less, more preferably 30 mm or less.
The interval between the two joining portions 5 and 5 adjacent in the lateral direction Y is preferably 60 mm or more, more preferably 80 mm or more, and preferably 190 mm or less, more preferably 180 mm or less.

The ratio of the maximum length, that is, the maximum width in the lateral direction Y of the notch 241 to the length of the longitudinal end 24X of the absorbent core 24 is preferably 0.1 or more, more preferably 0. 15 or more, preferably 0.5 or less, more preferably 0.4 or less.
The maximum length, that is, the maximum width in the lateral direction Y of the notch 241 is preferably 35 mm or more, more preferably 40 mm or more, and preferably 70 mm or less, more preferably 60 mm or less.
The ratio of the length in the longitudinal direction X of the cutout portion 241 to the total length in the longitudinal direction X of the absorbent core 24 is preferably 0.05 or more, more preferably 0.08 or more, and preferably as the latter / the former. Is 0.2 or less, more preferably 0.15 or less.
The length of the notch 241 in the longitudinal direction X is preferably 30 mm or more, more preferably 40 mm or more, and preferably 80 mm or less, more preferably 70 mm or less.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, in the above-described embodiment, the outer layer sheet 32 is configured by combining a plurality of sheets. However, similarly to the inner layer sheet 31, the outer layer sheet 32 may be configured by one continuous sheet. Moreover, the exterior body 3 is divided | segmented into the exterior body ventral region located in an abdominal part, and the exterior body back side area | region located in a back side part, The absorptive main body 2 is the said exterior body ventral region, It may be bridged and fixed to the exterior body back side field.

  The absorbent article of the present invention is not limited to the pants-type disposable diaper as in the above-described embodiment, and widely includes articles used to absorb bodily fluids (urine, menstrual blood, loose stool, sweat, etc.) discharged from the human body. Deployable disposable diapers having a so-called fastening tape, sanitary napkins, sanitary shorts, and the like are also included.

1 Pants-type disposable diaper (absorbent article)
1F Front body 1R Rear body 1A Ventral side (front waist part)
1B Crotch 1C Back side (back waist part)
2 Absorbent Main Body 21 Top Sheet 22 Back Sheet 23 Absorber 24 Absorbent Core 24X Longitudinal End of Absorbent Core 240 Longitudinal End of Absorbent Core 241 Notch 25 Core Wrap Sheet 3 Outer Body 31 Inner Layer Sheet 32 Outer Layer Sheet 32A Ventral outer layer sheet (elastic sheet)
32B Crotch outer layer sheet 32C Back side outer layer sheet (elastic sheet)
36, 37 Fiber sheet 38 Elastic member (elastic filament)
4 Joining part between absorbent main body and inner layer sheet (exterior body) 5 Joining part between inner layer sheet and outer layer sheet X Longitudinal direction Y Lateral direction

Claims (3)

An absorbent main body having an absorbent core containing an absorbent material, and an exterior body arranged on the non-skin-facing surface side of the absorbent main body to fix the absorbent main body, before and after the wearer An absorbent article having a longitudinal direction corresponding to a direction and a transverse direction perpendicular thereto,
The exterior body includes an inner layer sheet bonded to the absorbent main body, and an outer layer sheet bonded to the inner layer sheet and having stretchability in the lateral direction, and the absorbent body is stretched in the lateral direction. Fixed to the body,
The joint portion between the inner layer sheet and the outer layer sheet has a linear shape extending in the vertical direction in plan view, and a plurality of the joint portions are arranged intermittently in the lateral direction,
The longitudinal end portion of the absorbent core has a cutout portion that overlaps with the outer layer sheet in a plan view and a part of the longitudinal end portion of the longitudinal end portion is missing.
Between the inner layer sheet and the outer layer sheet are not joined to each other at the overlapping portion with the notch portion in plan view, and between the inner layer sheet and the absorbent main body at the overlapping portion. Absorbent articles that are not joined together.   The absorbent article according to claim 1, wherein the outer layer sheet has a configuration in which a thread-like elastic filament is bonded to one surface of an extensible fiber layer mainly composed of non-elastic fibers.   The absorptive article according to claim 1 or 2 in which said notch exists in a transverse direction central part of a longitudinal direction end part of said absorptive core.

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