JP6038456B2 - Disposable wearing article having liquid absorption layer - Google Patents

Description

  The present invention is a disposable diaper, disposable toilet training pants, disposable incontinence pants, disposable sanitary pants, a liquid absorbent layer used for disposable wear articles such as an incontinence pad, a disposable wear article having the liquid absorbent layer, And a method for producing the liquid-absorbing layer.

  Conventionally, the liquid absorption layer used for a disposable wearing article is well-known. For example, Patent Document 1 discloses a relatively thin liquid-absorbing layer that does not include pulp fibers and includes highly water-absorbing polymer particles between two non-woven fiber sheets.

JP 2000-238161 A

  According to the wearing article disclosed in Patent Document 1, since the liquid absorption region that absorbs and retains body fluid is formed only from the highly water-absorbing polymer particles, it has a required water absorption force and is relatively thin for a feeling of wear. It can be said that it is excellent. Further, since the highly water-absorbing polymer particles are fixed to the opposing surface of the fiber non-woven sheet via an adhesive applied in a mesh shape, the highly water-absorbing polymer particles are securely held between the sheets, and the adhesive is entirely attached to the opposing surface. There is no possibility that the water absorption performance of the liquid absorption layer is deteriorated as compared with the case where it is applied to the liquid.

  However, in this way, when the liquid absorption region is formed only from the superabsorbent polymer particles, the diffusibility of the body fluid is lower than when the pulp fiber is included, and the superabsorbent polymer absorbs the body fluid. In the area where the particles are already swollen, body fluid may remain on the skin-facing surface of the liquid-absorbing layer for a while after excretion, causing side leakage of the body fluid, or causing the wearer to feel uncomfortable and causing skin irritation.

  Accordingly, an object of the present invention is an improvement of the conventional technique, which is relatively thin and excellent in wearing feeling, and can absorb body fluid quickly, and a disposable wearing article having a liquid absorbing layer and a liquid absorbing layer The present invention relates to a liquid absorbing layer used in the manufacturing method and a method for manufacturing the same.

In order to solve the above-mentioned problems, the present invention has a longitudinal direction and a lateral direction, and a front waist region, a rear waist region, a crotch region located in the front and rear waist region, and an annular shape located in the front and rear waist region A disposable wearing article including the elastic waist panel and a crotch panel connected to at least the elastic waist panel located in the crotch region is intended.

In the disposable wearing article according to the present invention, the crotch panel has a liquid-absorbing layer including a liquid-absorbing core, and the liquid-absorbing layer includes a liquid-permeable or hardly liquid-permeable first sheet, and a liquid-permeable layer. A second sheet, and a liquid absorbing region including a liquid absorbing core interposed between the first sheet and the second sheet and fixed to at least one inner surface of the two sheets. The liquid core includes highly water-absorbing polymer particles, and the liquid-absorbing region is located at a central recess in the central portion in the lateral direction and on both sides in the lateral direction of the central recess and is thicker than the central recess. Both sides of the thickness, the mass per unit area of the superabsorbent polymer particles of the both sides is higher than that of the central recess, directly or indirectly on the skin facing surface of the liquid absorption layer It further has an absorbent pad that can be detachably attached, and the absorbent pad. Has a central portion and convex curved in the transverse direction of the liquid-absorbent layer and the surface facing the convex piece portion is positioned on said central recess of said liquid absorbing zone, the vertical in the central recess The absorptive pad and the liquid absorption area are fixed to each other through a plurality of fastening portions that are spaced apart in the direction .

  According to one or more embodiments of the disposable wearing article according to the present invention, since the liquid absorption layer has a central recess and thick side portions located on both sides in the lateral direction, excretion on the liquid absorption layer. The body fluid thus collected is temporarily stored in the central recess, and there is no risk of side leakage due to both sides serving as a barrier. Further, since the body fluid stored in the central recess is quickly absorbed by the superabsorbent polymer particles surrounding the body fluid, there is no possibility that the wearer may feel uncomfortable due to the body fluid staying on the liquid absorbing layer.

The perspective view of a disposable diaper shown as an example of the disposable wearing article in 1st Embodiment of this invention. The partially broken expansion | deployment top view which looked at the state which peeled the side seam of the diaper and extended in the front-back direction from the inner surface. The exploded perspective view of a diaper. FIG. 4 is a schematic cross-sectional view taken along line IV-IV in FIG. 1. The partially broken top view of a liquid absorption layer. FIG. 6 is a schematic cross-sectional view taken along line VI-VI in FIG. 5. Schematic of the manufacturing apparatus of a liquid absorption layer. The partially expanded view of the manufacturing apparatus of a liquid absorption layer. FIG. 8A is an enlarged view of a region indicated by IXA in FIG. 8, and FIG. 8B is a schematic cross-sectional view taken along line IXB in FIG. Sectional drawing similar to FIG. 6 in 2nd Embodiment. The top view of the crotch panel in 3rd Embodiment. FIG. 12 is a schematic cross-sectional view taken along line XII-XII in FIG. 11.

  1 to 3, a disposable diaper 10 shown as an example of the disposable wearing article of the present invention includes a longitudinal direction Y, a transverse direction X orthogonal thereto, and a virtual longitudinal center that bisects the width dimension of the transverse direction X. It has a line PP and a virtual horizontal center line QQ that bisects the width dimension in the vertical direction Y. The diaper 10 is symmetric with respect to the vertical virtual center line PP.

  The diaper 10 has a front waist region 11, a rear waist region 12, a chassis 14 having a crotch region 13 positioned between the front and rear waist regions 11, 12, and a liquid absorption connected to at least a skin facing surface of the crotch region 13. Structure 15. The chassis 14 includes a skin facing surface, a non-skin facing surface facing the skin, an annular elastic waist panel 16 extending in the direction around the waist, and a crotch panel 17 connected to the non-skin facing surface of the elastic waist panel 16. The elastic waist panel 16 includes a front waist panel 18 that forms the front waist region 11 and a rear waist panel 19 that forms the rear waist region 12.

  The front waist panel 18 intersects with the crotch panel 17 and extends in the lateral direction X. The outer end edge 18b extends in the lateral direction X while being spaced apart from the inner end edge 18a in the longitudinal direction Y. A laterally long rectangular shape is formed by both side edges 18c and 18d extending in the vertical direction X between the edges 18a and 18b.

  The rear waist panel 19 is substantially the same shape and size as the front waist panel 18, intersects with the crotch panel 17, and has an inner end edge 19 a that extends in the horizontal direction X and is spaced apart from the inner end edge 19 a in the vertical direction Y. The outer end edge 19b extending in the horizontal direction X and the side edges 19c, 19d extending in the vertical direction Y between the inner and outer end edges 19a, 19b are formed in a horizontally long rectangular shape.

  Each of the side edges 18c, 18d of the front waist panel 18 and each of the side edges 19c, 19d of the rear waist panel 19 are overlapped with each other and connected by side seams 20 extending intermittently in the longitudinal direction Y, thereby opening the waist opening. 21 and a pair of leg openings 22 are defined (see FIG. 1). The side seam portion 20 is applied by a known joining means, for example, various heat welding means such as hot embossing and sonic processing.

The front waist panel 18 includes a first inner sheet 23 positioned on the skin facing surface side and a first outer sheet 24 positioned on the non-skin facing surface side. The first inner and outer sheets 23 and 24 are substantially liquid-impervious SMS (spunbond / meltblown / spunbond) fiber nonwoven fabric, spunbond fiber nonwoven fabric, plastic sheet, or those having a mass of about 15 to 30 g / m ² It can be formed from a laminate sheet with at least one nonwoven fabric. The inner surfaces of both sheets 23 and 24 are joined together by a hot melt adhesive or the heat welding means.

  Referring to FIG. 3, a plurality of strand-like or string-like elastic bodies 25 extending in the horizontal direction X are disposed between the first inner and outer surface sheets 23 and 24 so as to extend in the horizontal direction X. The front waist panel 18 is elasticized so that it can contract at least in the lateral direction X by the elastic body 25 being disposed under extension in the lateral direction X. The first inner and outer sheets 23 and 24 are hot melts applied to almost the entire peripheral surface of the elastic body 25 as long as the joined state of the sheets 23 and 24 is not likely to be peeled off during handling or wearing of the diaper 10. They may be joined to each other only via an adhesive.

The rear waist panel 19 has a second inner sheet 28 positioned on the skin facing surface side and a second outer sheet 29 positioned on the non-skin facing surface side. The second inner and outer surface sheets 28 and 29 are substantially liquid-impervious SMS (spunbond / meltblown / spunbond) fiber nonwoven fabric, spunbond fiber nonwoven fabric, plastic sheet, or those having a mass of about 15 to 30 g / m ² It can be formed from a laminate sheet with at least one nonwoven fabric. The inner surfaces of both sheets 28 and 29 are joined together by a hot melt adhesive or the heat welding means.

  Between the sheets 28 and 29, an elastic body 30 made of a plurality of strand-like or string-like elastic bodies extending in the lateral direction X is disposed under extension in the lateral direction X. The rear waist panel 19 is elasticized so that it can contract at least in the lateral direction X by the elastic body 30 being disposed. Note that the two sheets 28 and 29 may be joined to each other only via a hot-melt adhesive applied to almost the entire circumferential surface of the elastic body 30.

  The crotch panel 17 is a vertically long, substantially rectangular shape, and has a front end portion 33 connected to the non-skin facing surface (outer surface) of the front waist panel 18 and a rear end connected to the non-skin facing surface of the rear waist panel 19. A portion 34 and an intermediate portion 35 extending in the longitudinal direction Y between the front and rear end portions 33, 34. The crotch panel 17 includes a base sheet 36 and a liquid absorbing structure 15 disposed on the skin facing surface (inner surface) of the base sheet 36. The liquid absorbing structure 15 includes a liquid absorbing layer 37 and a body side liner 38 that is formed of a liquid permeable sheet and covers at least the skin facing surface side of the liquid absorbing layer 37.

The body side liner 38 is a fiber nonwoven fabric sheet having a liquid permeability of a mass of about 15 to 35 g / m ² , preferably hydrophilized, such as a spunbond fiber nonwoven fabric, a point bond fiber nonwoven fabric, and an air-through nonwoven fabric. It can be formed from various known fiber nonwoven fabrics.

As long as the effects of the present invention described later are exhibited, the diaper 10 of the present invention is configured by a chassis 14 in which the front and rear waist regions 11 and 12 and the crotch region 13 are not separate but are integrally formed. There may be. In that case, the liquid-absorbing structure 15 is interposed between the liquid-permeable top sheet that is located on the skin-facing surface and the liquid-impermeable back sheet that is located on the non-skin-facing surface that constitute the chassis 14. May be. The disposable wearing article may be a substantially rectangular body fluid absorbing member such as an incontinence pad.

  3 and 4, the base sheet 36 is formed by inner and outer surface crotch sheets 39, 40 formed of a substantially liquid-impervious fiber nonwoven fabric sheet or a liquid-impervious plastic film. Further, the inner surfaces of the inner and outer surface crotch sheets 39 and 40 are joined to each other via a hot melt adhesive (not shown), and both side portions thereof are bent inward to have a gasket function of extending in the vertical direction. A pair of elastic side flaps 41 is formed.

  Each elastic side flap 41 is provided with a plurality of strand-like or string-like elastic bodies 43 and 44 extending in the longitudinal direction Y and extending in the longitudinal direction Y, and is elasticized at least in the longitudinal direction Y. Has been. The elastic body 43 extends straight in the longitudinal direction Y along the inner edge 41 a of the elastic side flap 41. The elastic body 44 is convex toward the longitudinal virtual center line PP at the center of the crotch region, and extends in the direction around the wearer's leg when the diaper 10 is worn. The elastic bodies 43 and 44 are fixed between the inner and outer surface crotch sheets 39 and 40 via a hot melt adhesive (not shown).

  The elastic body 44 has a central portion that protrudes toward the longitudinal virtual center line PP and is close to the other elastic body 43, so that in the elastic region of the elastic bodies 43, 44, The extensional stress is increased as compared with the extensional stress in the vicinity of the front and rear waist panels 18 and 19 having a large interval therebetween. Thereby, the central part vicinity of the elastic side flap 41 which should contact a wearer's thigh closely_contact | adheres to a thigh part, and can prevent the leak from a leg opening edge part effectively.

  The crotch panel 17 is connected to the outer surfaces of the front and rear waist panels 18 and 19 via a front joint region 45 and a rear joint region 46 located on the skin facing surfaces of the front end portion 33 and the rear end portion 34. The front and rear joining regions 45 and 46 can be formed from a hot melt adhesive, and have a concave portion opened toward the crotch region 13, and the hot melt adhesive is not applied to the opened concave portion. A non-bonded area 47 is defined. Referring to FIG. 4, the front and rear end portions of the liquid absorbing structure 15 are fixed to the inner surface of the base sheet 36 via a joint portion 48 located on the outer surface thereof.

Referring to FIGS. 1 to 3, cover sheets 49 and 50 that cover the front and rear end portions 33 and 34 of the crotch panel 17 are attached. The cover sheets 49 and 50 are formed of a fiber nonwoven fabric or a plastic sheet having a mass of about 10 to 30 g / m ² , and the front and rear waist panels 18 and 19 are crossed with the front and rear end portions 33 and 34 of the crotch panel 17. It is fixed to the non-skin facing surface via a hot melt adhesive (not shown). When the wearer or a wear assistant grasps the front and rear waist panels 18 and 19 with fingers and pulls up when the diaper 10 is worn by covering the front and rear end portions 33 and 34 of the crotch panel 17 with the cover sheets 49 and 50. There is no risk that the fingers will be caught on the front and rear end portions 33 and 34. Further, since the rigidity is increased by attaching the cover sheets 49 and 50, the area can be stably pulled up by grasping the area with a finger without breaking a part of the sheet member.

  As will be described later, the liquid absorbing structure 15 has a sheet shape because the liquid absorbing layer 37 has a relatively small thickness. Specifically, the thickness of the portion of the crotch panel 17 where the liquid absorbing structure is disposed, for example, the central portion of the crotch panel 17 is about 5 mm or less. Moreover, the cantilever bending resistance is 15 to 140 mm. The liquid absorbing structure 15 is relatively thin and has a high flexibility as a member that absorbs bodily fluids. Therefore, the liquid absorbing structure 15 can easily follow the movement of the crotch panel 17, and the crotch panel 17 holds excrement. Even when the liquid-absorbing structure 15 hangs downward, there is no possibility that the liquid absorbing structure 15 is separated from the crotch panel 17 and is not displaced.

<Measurement method of cantilever bending resistance>
In accordance with JISL1096 cantilever method, samples (length 50 mm in the horizontal direction X, length 150 mm in the vertical direction Y) are cut from the center of the crotch panel 17 of the diaper 10, and the skin facing surface and non-skin of each sample The opposite surface was measured. The number of measurements (n) was 3.

  Referring to FIG. 4, the front and rear end portions 33 and 34 of the crotch panel 17 are connected to the outer surfaces of the front and rear waist panels 18 and 19, so that the crotch panel 17 has a hammock shape that is suspended by them. Since the liquid absorption structure 15 is relatively thin, the diaper 10 has a large volume of waste storage space 52 as compared with other diapers of this type and holds a relatively large amount of waste. can do. Moreover, since the space part 53 is formed when the non-joining area | region 47 is demarcated between the front-and-back joining areas 45 and 46, the excretion accommodation space 52 can be enlarged more.

Referring to FIG. 5, the liquid absorbing layer 37 includes a front end edge 57 extending in the lateral direction X on the front waist region 11 side, a rear end edge 58 extending in the lateral direction X on the rear waist region 12 side, front and rear end portions 57, 58 and both side edges 59 extending in the longitudinal direction Y. The liquid absorbing layer 37 is insoluble in water and has a water absorbing core having so-called highly water-absorbing polymer particles 60 having a water absorbing power of 10 times or more of its own mass, and a mass of about 8.0 located on the non-skin facing surface side. -15.0 g / m ² , preferably 11.0 g / m ² of a first sheet (lower sheet) 61 formed from a liquid-permeable or hardly liquid-permeable SMS fiber nonwoven fabric, and positioned on the skin facing surface side And a second sheet (upper sheet) 62 formed from a liquid-permeable fibrous nonwoven fabric having a mass of about 8.0 to 15.0 g / m ² , preferably about 10.0 g / m ² .

Referring to FIGS. 5 and 6, the liquid-absorbing layer 37 is in the longitudinal direction Y in which superabsorbent polymer particles 60 having a mass of about 30 to 300 g / m ² , preferably about 40 to 280 g / m ² are arranged. A plurality of liquid absorption regions 63 defined in a substantially rectangular shape spaced apart by a given dimension, and a seal region 64 positioned so as to surround the liquid absorption region 63 in which the superabsorbent polymer particles 60 are not substantially disposed. Have. The highly water-absorbing polymer particles 60 are fixed in the liquid-absorbing region 63 via a joint portion 66 located on the inner surface of the first sheet 61. The joint 66 can be formed from a hot melt adhesive applied intermittently. In the seal area 64, the first sheet 61 and the second sheet 62 are joined to each other by the joining portion 66 so as not to be peeled off. In the present embodiment, the liquid absorption area 63 is divided into eight areas, but the area and the number of areas can be appropriately changed according to the absorption performance required by the liquid absorption structure 15, for example, eight or more. Or may be formed from only one area extending over the entire liquid absorbing structure 15.

  The liquid-absorbent core of the liquid-absorbent layer 37 includes 70% by mass or more of the highly water-absorbing polymer particles 60, which is a mixture in which the highly water-absorbing polymer particles 60 and fluff pulp are mixed in substantially the same ratio. Compared to the case of consisting of, it is thinner overall. In addition, the first and second sheets 61 and 62 are stably fixed in the seal region 64, thereby having a required peel strength, and the entire inner surfaces of the first and second sheets 61 and 62 are fixed. It can be said that it has high flexibility as compared with the case. The liquid-absorbent core may contain not only the highly water-absorbing polymer particles 60 but also known materials such as fluff pulp and optionally thermoplastic staple fibers at a relatively low mixing rate. Specifically, when water-absorbing fibers such as fluff pulp are mixed, it is preferably mixed at a ratio of about 0 to 30% by weight with respect to the entire liquid-absorbent core. In order to adjust the absorption rate of the entire liquid-absorbing layer 37, for example, two types having different absorption rates can be used in combination with the highly water-absorbing polymer particles 60.

Referring to FIG. 6, each liquid absorption region 63 has a cross-sectional shape in which the central portion in the transverse direction X is bent, and has a relatively thin central recess 70 and a wall thickness that is relatively thicker than the central recess 70. And both side portions 71. In the central recess 70, a single layer of the superabsorbent polymer particles 60 is fixed to the inner surfaces of the first and second sheets 61 and 62 through the joint portion 66 so as to be substantially immovable. It is separated by sandwiching. The central recess 70 is fixed superabsorbent polymer particles 60 mass about 10 to 100 g / ^{m 2} is on both sides 71, superabsorbent polymer particles 60 mass about 50 to 300 g / ^{m 2} is fixed Yes. In the central recess 70, the superabsorbent polymer particles 60 are arranged in the lateral direction X in a state of being fixed so as not to overlap each other by the joint 66, but as long as they do not move, a plurality of superabsorbent polymer particles 60 are arranged. May be laminated so as to overlap each other.

  When the liquid-absorbent core is mainly formed from the highly water-absorbent polymer particles 60, the absorption rate of the body fluid is slower than when the water-absorbent fibers such as fluff pulp are mixed in at least approximately the same ratio. The body fluid may temporarily stay on the liquid absorbing structure 15 and cause side leakage. In the case of the present embodiment, the excreted body fluid stays temporarily on the central recess 70 of the liquid absorption layer 37, and both side portions 71 serve as a barrier to prevent side leakage of the body fluid. Can also absorb and retain body fluids. In addition, since the body fluid is absorbed by the central recess 70 and the both side portions 71, the absorption area becomes larger than when the body fluid is absorbed only by the center recess 70, and the absorption speed of the body fluid can be increased.

  In each liquid absorption region 63, the highly water-absorbing polymer particles 60 fixed to the first and second sheets 61 and 62 via the joint portion 66 absorb the body fluid that has moved into the liquid absorption region 63 and swell. By doing so, the fixing between the two sheets 61 and 62 may be released. In that case, some of the highly water-absorbing polymer particles move in the liquid-absorbing layer 37 and are distributed almost uniformly.

<Method for Producing Liquid Absorbing Layer 37>
7 is a schematic view of the manufacturing apparatus 80 for the liquid absorbing layer 37, FIG. 8 is a partially enlarged view of the manufacturing apparatus 80, FIG. 9A is an enlarged view of a region indicated by IXA in FIG. 7, and FIG. It is typical sectional drawing which follows the IXB line of 8 (a). In each figure, the machine direction is indicated by MD, and the direction perpendicular thereto is indicated by CD. 7 and 8, in the manufacturing apparatus 80 for the liquid absorbing layer 37, the first fiber web 81 serving as the base material of the second sheet 62 is unwound from the unwinding roll 83a and passes in the machine direction MD through the transporting roll 82a. The manufacturing apparatus 80 is transported and includes a rotary suction drum 84 that rotates in one direction, first and second spraying stations 85 and 86, a press station 87, a coating station 88, and a cutting station 89. The second fiber web 103 serving as the base material of the first sheet 61 is fed by the feed roll 83b, conveyed through the conveyance roll 82b, and supplied onto the rotary suction drum 84. On the outer peripheral surface 93 of the rotary suction drum 84, there are provided a plurality of suction concave molds 94 that are substantially the same shape as the liquid absorption areas 63 that are intermittently arranged in the circumferential direction, and there are spaced portions 98 between the suction concave molds 94. Is provided. The first fiber web 81 is concave toward the axis of the rotary suction drum 84 along the shape of the suction concave mold 94.

  The stations of the production apparatus 80 will be described. First, the superabsorbent polymer particles 60 are sprayed on one surface of the first fiber web 81 at the first spraying station 85. The first spraying station 85 includes a slope-shaped spraying guide 95 having a spraying port 95a having a predetermined width, and a required amount of superabsorbent polymer particles 60 is transferred from a supply device (not shown) to the spraying guide 95. It is supplied through a pipe. A shutter (not shown) is provided at the spray port 95a of the spray guide 95, and a predetermined amount of superabsorbent polymer particles are sprayed onto the first fiber web 81 with the shutter opened.

  Similar to the first spraying station 85, the second spraying station 86 includes a slope-shaped spraying guide 99 having a spraying port having a predetermined width, and the spraying guide 99 is supplied with a required amount of superabsorbent polymer particles 60. It is supplied from a device (not shown) via a transfer pipe. A substantially triangular dividing plate 100 is provided at the center of the spraying guide 99 on the spraying port 99a side, and the superabsorbent polymer particles 60 are distributed to both sides in the cross direction CD and sprayed at the first spraying station 85. The superabsorbent polymer particles 60 are dispersed. The distribution region 96 of the superabsorbent polymer particles 60 accumulated in the suction concave mold 94 of the rotary suction drum 84 is further distributed on the superabsorbent polymer particles 60 sprayed at the first spraying station 85 at the second spraying station 86. It has the laminated part 101 formed by laminating | stacking the superabsorbent polymer particle 60 produced, and the single layer part 102 located between the laminated parts 101. FIG.

  Referring to FIGS. 9A and 9B, a spraying auxiliary means 97 is provided on the downstream side of the second spraying station 86. The spraying auxiliary means 97 has a brush 97a extending in the cross direction CD, and the brush 97a is in contact with a portion on the separation portion 98 located between the suction concave molds 94 of the rotary suction drum 84 of the first fiber web 81 or The superabsorbent polymer particles 60 that are disposed slightly apart from each other can be dropped onto the suction concave mold 94. Thereby, after passing through the rotary suction drum 84, a region where the superabsorbent polymer particles 60 do not exist is formed between the spray regions 96, and the spray region 96 is intermittently formed in the machine direction MD on the first fiber web 81. To position. Without using the spraying auxiliary means 97, the superabsorbent polymer particles 60 are intermittently sprayed on the first fiber web 81 only by controlling the opening and closing timing of the shutters of the first and second spraying stations 85 and 86. It is possible to define a plurality of spraying areas 96, but when the spraying auxiliary means 97 is used, the spraying areas 96 can be intermittently arranged more reliably.

Referring again to FIGS. 7 and 8, the first fiber web 81 passes through the second spraying station 86 and then merges with the second fiber web 103 which becomes the base material of the first sheet 61, so that the nip roller and the rotary suction drum 84 are combined. Are pressed together at a press station 87 comprising: A hot melt adhesive 107 is applied to one surface of the second fiber web 103 at an application station 88, and the first fiber web 81 and the second fiber web 103 are bonded to each other via the hot melt adhesive 107. Thus, the continuous laminated body 108 is formed. The continuous laminated body 108 is transported in the machine direction MD by the transport rolls 82c and 82d, and is cut at a cut station 89 composed of the cut roll 109 and the anvil roll 110 disposed opposite thereto, thereby a plurality of liquid absorbing layers. 37 is formed. The superabsorbent polymer particles 60 sprayed at the first spraying station 85 are sprayed at the second spraying station 86 with different particle sizes, absorption speeds, etc., so that two kinds of superabsorbent polymer particles 60 are laminated. It is also possible to mold the liquid absorbent core.

Second Embodiment
FIG. 10 is a cross-sectional view similar to FIG. 6 in the second embodiment of the present invention, and only differences from the first embodiment will be described below. In the present embodiment, the two sheets 61 and 62 are fixed to each other in the seal region 64 via the first joint portion 66 located on the inner surface of the first sheet 61 and the second joint portion 111 located on the inner surface of the second sheet 62. In addition, the superabsorbent polymer particles 60 are fixed in the liquid absorption region 63 via the first and second joints. According to the present embodiment, the first and second sheets 61 and 62 are joined to each other via the first and second joint portions 66 and 111 in the seal region 64, thereby improving their joint strength. The highly water-absorbing polymer particles 60 can be more stably fixed between the sheets 61 and 62 in the liquid absorption region 63. As a manufacturing method of the liquid absorption layer 37 in the case of the present embodiment, for example, in the manufacturing method shown in FIG. 7, a hot melt adhesive is applied to one surface of the first fiber web 81 on the upstream side of the first spraying station 85. The second bonding part 111 can be formed by providing a coating station. In that case, in order to avoid the hot melt adhesive from adhering to the brush or the like that constitutes the spraying auxiliary means 97, the spraying auxiliary means 97 is not provided, and the shutter opening and closing timing of the first spraying station 85 and the rotation suction are provided. It is preferable to form a spray pattern of the superabsorbent polymer particles 60 only with the suction concave mold 94 of the drum 84.

<Third Embodiment>
With reference to FIG. 11 and FIG. 12, only points different from the first embodiment will be described below. In this embodiment, a substantially rectangular absorption extending in the longitudinal direction Y on the liquid absorption structure 15. A conductive pad 114 is disposed. The absorbent pad 114 has a width dimension and a length dimension slightly smaller than those of the liquid absorbent layer 37, and is formed by mixing highly water absorbent polymer particles and water absorbent fibers such as fluff pulp. And a wrap sheet 116 formed of various known fiber nonwoven fabrics or plastic sheets that enclose the core. The absorbent pad 114 has a convex curved parts 117 which convexly curved toward the liquid-absorbent layer 37 in the vicinity of the central portion of the surface facing the liquid absorbent layer 37, the convex curved portion 117 through the bodyside liner 38 It is indirectly located on the central recess 70 of the liquid absorption layer 37. The skin facing surface of the body side liner 38 where the central recess 70 is located is provided with fastening portions 118a, 118b, 118c arranged at a given distance in the longitudinal direction Y, and the fastening portions 118a, 118b. , 118c, the absorbent pad 114 is detachably fixed to the liquid absorbing structure 15. Since the absorbent pad 114 is fixed in a state in which the convex portion 117 is fitted in the central concave portion 70 of the liquid absorbing layer 37, the absorbent pad 114 is compared with the case where the absorbent pad 114 has a flat shape. Thus, the liquid absorbing layer 37 can be more stably attached. The fastening portions 118a, 118b, and 118c are formed from a plurality of hooks of a mechanical fastener. When the wrap sheet 116 of the absorbent pad 114 is formed from a fiber nonwoven fabric, the fastening portions 118a, 118b, and 118c are directly attached to the wrap sheet 116. Alternatively, it may be fastened via a fastened portion provided on the outer surface of the lap sheet 116 having a plurality of loops. When the liquid absorbing structure 15 does not have the body side liner 38, the absorbent pad 114 is fixed directly to the liquid absorbing layer 37 via the fixing portions 118 a, 118 b, 118 c located on the liquid absorbing layer 37. May be. As long as the absorptive pad 114 is stably fixed to the liquid absorbing structure 15, the affixing portions 118a, 118b, and 118c may be provided with only the affixing portion 118a located at the center. The front and rear edges of the pad 114 may extend in a series in the vertical direction Y, and may be further divided into three or more.

  By disposing the absorbent pad 114 on the liquid absorption layer 37, the body fluid absorption capacity of the liquid absorption structure 15 can be increased and more body fluid can be absorbed. When going out with the diaper 10 worn, there is a risk that the diaper 10 may be excreted several times without exchanging the diaper 10, and in that case, relatively high absorption is required to absorb and retain the excreted body fluid. Requires capacity. In the case of this embodiment, the absorbent pad 114 is detachably disposed on the liquid absorbing structure 15, so that the absorption performance can be improved and more body fluid can be absorbed.

  In addition to the materials described in the present specification, various known materials that are usually used in this type of article can be used without limitation for the respective constituent members constituting the diaper 10. In the specification of the invention and the claims, the terms “first” and “second” are used merely to distinguish similar elements, positions, and the like.

The disclosure relating to the present invention described above can be summarized in at least the following matters.
It has a longitudinal direction and a lateral direction, a front waist region, a rear waist region, a crotch region located between the front and rear waist regions, an annular elastic waist panel located in the front and rear waist regions, and at least the crotch region In a disposable wearing article comprising a crotch panel connected to the elastic waist panel located,
The crotch panel has a liquid absorbing layer including a liquid absorbing core,
The liquid-absorbing layer is interposed between the liquid-permeable or hardly liquid-permeable first sheet, the liquid-permeable second sheet, the first and second sheets, and at least any of the two sheets. Having a liquid absorbing area including a liquid absorbing core fixed to one inner surface,
The liquid absorbent core comprises superabsorbent polymer particles;
The liquid absorption area has a central recess located in a central portion in the lateral direction, and both side portions located on both sides in the lateral direction of the central recess and thicker than the central recess. The mass per unit area of the superabsorbent polymer particles is higher than that of the central recess,
It further has an absorbent pad that is detachably attached directly or indirectly on the skin-facing surface of the liquid-absorbing layer,
In the absorbent pad, a central portion in the lateral direction of a surface facing the liquid absorbing layer is convex, and the convex curved portion is located on the central concave portion of the liquid absorbing area, and the center The absorbent pad and the liquid absorption area are fixed to each other through a plurality of fastening portions that are spaced apart in the vertical direction in the recess .

The present invention disclosed in the above paragraph can include at least the following embodiments.
(1) the absorbent pad includes the liquid-absorbent core formed from a mixture of the superabsorbent polymer particles and absorbent fibers, the thickness is greater than the liquid-absorbent layer.

10 Disposable wearing articles (disposable diapers)
37 Liquid-absorbing layer 60 High water-absorbing polymer particles 61 First sheet 62 Second sheet 63 Liquid-absorbing area 64 Sealing area 70 Central recess 71 of the liquid-absorbing layer Both sides 81 of the liquid-absorbing layer First fiber web 85 First spraying station 86 Second application station 87 Press station 88 Application station 96 Application area 103 Second fiber web 114 Absorbent pad 115 Absorbent core MD Machine direction X Horizontal direction Y Vertical direction

Claims (2)

It has a longitudinal direction and a lateral direction, a front waist region, a rear waist region, a crotch region located between the front and rear waist regions, an annular elastic waist panel located in the front and rear waist regions, and at least the crotch region In a disposable wearing article comprising a crotch panel connected to the elastic waist panel located,
The crotch panel has a liquid absorbing layer including a liquid absorbing core,
The liquid-absorbing layer is interposed between the liquid-permeable or hardly liquid-permeable first sheet, the liquid-permeable second sheet, the first and second sheets, and at least any of the two sheets. Having a liquid absorbing area including a liquid absorbing core fixed to one inner surface,
The liquid absorbent core comprises superabsorbent polymer particles;
The liquid absorption area has a central recess located in a central portion in the lateral direction, and both side portions located on both sides in the lateral direction of the central recess and thicker than the central recess. The mass per unit area of the superabsorbent polymer particles is higher than that of the central recess,
It further has an absorbent pad that is detachably attached directly or indirectly on the skin-facing surface of the liquid-absorbing layer,
The absorbent pad has a convex central portion in the lateral direction of the surface facing the liquid absorbing layer, and the convex curved portion is located on the central concave portion of the liquid absorbing area ,
The longitudinal direction through a plurality of fastening portions which are spaced to discard have used you wherein the absorbent pad and the liquid-absorbent zone are fixed to each other wearing article in said central recess.   2. The disposable wear according to claim 1, wherein the absorbent pad includes the liquid-absorbent core formed from a mixture of the superabsorbent polymer particles and a water-absorbent fiber, and has a thickness dimension larger than that of the liquid-absorbent layer. Goods.

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