WO2020137432A1 - Absorbent body for absorbent article and absorbent article - Google Patents

Abstract

The purpose of the present disclosure is to provide an absorbent body for absorbent articles which has an excellent temporary liquid storing property and liquid migration property in the thickness direction. An absorbent body according to the present disclosure has the following configuration. This absorbent body (1) is an absorbent body (14) for absorbent articles which has the thickness direction (T) and the plane direction (P), the absorbent body having: a first absorbent layer (41) including an absorbent polymer; a second absorbent layer (42) including a highly absorbent polymer; and an intermediate layer (43) disposed therebetween and including a fiber, wherein the absorbent body (1) is characterized in that the intermediate layer (43) is provided with a low fibrous density part (LD) having relatively low fibrous density, and a high fibrous density part (HD) having relatively high fibrous density.

Description

Absorber for absorbent article, and absorbent article

The present disclosure relates to an absorbent body for an absorbent article and the absorbent article.

An absorbent body for absorbent articles is known, which comprises a first absorbent layer containing a superabsorbent polymer, a second absorbent layer containing a superabsorbent polymer, and a fabric layer disposed therebetween. There is.
For example, Patent Document 1 discloses a water-absorbent sheet having a structure in which an absorbent layer containing a water-absorbent resin and an adhesive is sandwiched between hydrophilic nonwoven fabrics, and satisfies the following requirements (1) and (2): A structure in which the absorbent layer is divided into a primary absorbent layer and a secondary absorbent layer by a base material layer in which two or more layers of a breathable base material are adhered and laminated with an adhesive, Water-absorbent sheet: (1) The basis weight of the base material layer is 25 g/m ² or more, and (2) the amount of the adhesive between the air-permeable base materials is 0.1 to 50 g/m ^2. It is described that they are bonded.

In the water absorbent sheet (absorbent body) described in Patent Document 1, the base layer suppresses blocking by the water absorbent resin (super absorbent polymer) in the absorbent body having a high ratio of the water absorbent resin (super absorbent polymer). At the same time, the base material layer is a member that compensates for the slow absorption of the water-absorbent resin (superabsorbent polymer) by temporarily storing the liquid.

International Publication No. 2010/143635 Pamphlet

In the water absorbent sheet (absorbent body) described in Patent Document 1, the liquid that has reached the primary absorbent layer stays around the superabsorbent polymer contained in the primary absorbent layer and exists in the thickness direction, that is, on the clothing side. It was difficult to transfer to the base material layer, and then to the secondary absorption layer, and the base material layer was difficult to store the liquid in the primary.
Therefore, it is an object of the present disclosure to provide an absorbent body for absorbent articles, which is excellent in the temporary storage property of the liquid and the transfer property of the liquid in the thickness direction.

The present disclosure comprises a first absorbent layer comprising a superabsorbent polymer, a second absorbent layer comprising a superabsorbent polymer, and an intermediate layer comprising fibers disposed therebetween and having a thickness of An absorbent body for absorbent articles, having a depth direction and a plane direction, wherein the intermediate layer has a low fiber density portion having a relatively low fiber density and a high fiber density portion having a relatively high fiber density. We have found an absorber characterized by being provided.

The absorber for absorbent articles according to the present disclosure is excellent in the temporary storage property of liquid and the transfer property of liquid in the thickness direction.

FIG. 1 is a front view of a pants-type diaper 1 according to the first embodiment in a developed state. FIG. 2 is a rear view of the pants-type diaper 1 in the unfolded state. FIG. 3 is a sectional view of the pants-type diaper 1 taken along the line III-III in FIG. FIG. 4 is a cross-sectional view of the absorber 14 taken along the line III-III in FIG. FIG. 5 is a diagram for explaining the absorber 14.

Specifically, the present disclosure relates to the following aspects.
[Aspect 1]
It is provided with a first absorbent layer containing a super absorbent polymer, a second absorbent layer containing a super absorbent polymer, and an intermediate layer containing fibers, which is arranged between them. An absorbent body for an absorbent article, comprising:
The intermediate layer has a low fiber density portion having a relatively low fiber density, and a high fiber density portion having a relatively high fiber density,
The above absorber, which is characterized in that

Since the absorbent body includes the intermediate layer having the predetermined high fiber density portion, the high fiber density portion of the intermediate layer reaches the first absorption layer and stays around the first water absorbent material. Can be temporarily stored. The high fiber density portion of the intermediate layer moves the temporarily stored liquid to the low fiber density portion of the intermediate layer as the amount of the temporarily stored liquid increases, and then the low fiber density portion containing the liquid is Depending on the requirements of the absorbent layer, the liquid can be transferred to the second absorbent layer. Therefore, in the absorber, the intermediate layer is excellent in the temporary storage property of the liquid and also in the transfer property of the liquid in the thickness direction.

[Aspect 2]
The absorbent body according to aspect 1, wherein the high fiber density portion extends in a predetermined direction within the plane direction.

In the absorbent body, since the high fiber density portion provided in the intermediate layer extends in a predetermined direction in the plane direction, the high fiber density portion of the intermediate layer is drawn in, and the liquid temporarily stored is stored in the flat surface of the intermediate layer. The liquid can be diffused in a predetermined direction within the direction, and then the liquid diffused in the planar direction is easily transferred to the thickness direction, that is, the second absorption layer. Therefore, the absorbent body is excellent in the transferability of the liquid in the thickness direction and the plane direction.

[Aspect 3]
The intermediate layer includes a high basis weight region having a relatively high basis weight and a low basis weight region having a relatively low basis weight, and the high fiber density portion is arranged in the high basis weight region. The absorbent body according to Aspect 1 or 2, wherein

In the absorbent body, since the high fiber density portion is arranged in the high grammage region, the amount of fibers forming the high fiber density portion becomes relatively large and reaches the first absorption layer to reach the first water absorption layer. The liquid staying around the material can be drawn in by the high fiber density part, and then the liquid can be drawn in the intermediate layer and temporarily stored. As a result, the absorber has excellent temporary storage properties.

[Mode 4]
The intermediate layer, in a predetermined folding axis, is composed of an intermediate sheet that is folded in the thickness direction, the intermediate layer, the intermediate sheet, an overlapping portion in which the intermediate sheet is overlapped in the thickness direction, The absorbent body according to aspect 3, wherein the intermediate sheet is partitioned into non-overlapping portions that do not overlap in the thickness direction, and the high basis weight region includes the overlapping portions.

In the absorbent body, the intermediate layer is composed of the folded intermediate sheet, and the high basis weight region of the intermediate layer is composed of the overlapping portion. Therefore, when the high fiber density portion of the intermediate layer draws in the liquid, the overlapping portion forming the high basis weight region can spread in the thickness direction with the folding axis as a base point, so that the high basis weight of the intermediate layer is high. The region (overlapping portion) can store the liquid more temporarily, and the absorber has excellent temporary storage properties.

[Aspect 5]
The absorbent body according to aspect 4, wherein the high fiber density portion is an embossed portion that embosses the overlapping portion.

In the absorbent body, the high fiber density part is a predetermined embossed part, and the overlapping part is connected by the embossed part, so the high fiber density part of the intermediate layer draws in the liquid, and the high fiber density part is arranged. Even when the overlapping portion is spread in the thickness direction with the folding axis as a base point, the high fiber density portion (embossed portion) can suppress the twisting of the absorbent body.

[Aspect 6]
6. The absorbent body according to any one of aspects 1 to 5, wherein the intermediate layer has a skin side surface, and the fiber density inside the middle layer is higher than the fiber density on the skin side surface.

In the absorbent body, the fiber density in the inside of the intermediate layer is higher than the fiber density in the skin side surface of the intermediate layer. The liquid is easily transferred to the clothes surface, and thus the liquid transferred to the clothes surface of the intermediate layer is easily transferred to the second absorbent layer. Therefore, the absorbent body is excellent in the transferability of the liquid in the thickness direction.
In addition, the skin side of the intermediate layer, which has a relatively low fiber density, can retain the superabsorbent polymer contained in the first absorbent layer in the voids between the fibers, and is excellent in retainability of the superabsorbent polymer.

[Aspect 7]
The intermediate layer is an intermediate sheet including a first surface having a relatively low fiber density and a second surface having a relatively high fiber density, the second surface being an inner surface, and at a predetermined folding axis. 7. The absorbent body according to aspect 6, which is configured by being folded.

In the absorbent article, the intermediate layer is composed of an intermediate sheet that is folded with the first surface having a relatively low fiber density as the outer surface and the second surface having a relatively high fiber density as the inner surface. In addition to the effect of aspect 6, the intermediate sheet can retain the superabsorbent polymer of the first absorbent layer and the superabsorbent polymer of the second absorbent layer in the voids between the fibers, and retain the superabsorbent polymer. Excellent in performance.

[Aspect 8]
The absorber has a longitudinal direction and a width direction,
The second absorbent layer is provided with a pair of channels extending in the longitudinal direction and spaced in the width direction with a longitudinal centerline of the absorber interposed therebetween.
The high fiber density portion, in the thickness direction, overlaps with each of the pair of channels,
The absorber according to any one of aspects 1 to 7.

In the absorbent body, the high fiber density portion of the intermediate layer overlaps with the pair of channels of the second absorbent layer in the thickness direction. The pair of channels arranged in the second absorbent layer contributes to the deformation induction in which the absorbent body and the absorbent article including the absorbent body form a three-dimensional shape with the pair of channels as starting points. In the absorbent body, since the high fiber density portion of the intermediate layer overlaps with the pair of channels in the thickness direction, the liquid drawn in by the high fiber density portion of the intermediate layer is retained in the pair of channels of the second absorption layer. The liquid can be transferred to the channel and diffused through the pair of channels to the second absorption layer. As described above, the absorbent body is excellent in the deformation inducibility, and is also excellent in the transferability of the liquid in the thickness direction and the plane direction.

In addition, in the absorbent body, since the high fiber density portion of the intermediate layer overlaps with the pair of channels in the thickness direction, the wearer of the absorbent article may place the pair of channels of the second absorbent layer at the pair of channels. Hard to remember the difference in rigidity.

[Aspect 9]
A liquid-permeable sheet, a liquid-impermeable sheet, an absorbent article comprising an absorber arranged between them,
The absorbent body is the absorbent body according to any one of aspects 1 to 8,
The absorbent article.
The absorbent article has the same effect as that of the first aspect.

The absorbent body for absorbent articles (hereinafter, also referred to as “absorbent body of the present disclosure”) of the present disclosure and the absorbent article will be described in detail below. In addition, for simplification of description, in the embodiment of the absorbent article, the absorber is also described.

1 to 5 are diagrams for describing an absorbent article according to one of the embodiments of the present disclosure (hereinafter, referred to as a first embodiment), specifically, a pants-type diaper 1. Specifically, FIG. 1 and FIG. 2 are a front view and a rear view of the pants-type diaper 1 in a developed state, respectively. FIG. 3 is a sectional view of the pants-type diaper 1 taken along the line III-III in FIG. FIG. 4 is a cross-sectional view of the absorber 14 taken along the line III-III in FIG. 5A and 5B are views for explaining the absorber 14, FIG. 5A is a plan view, and FIG. 5B is a cross-sectional view taken along the line Vb-Vb in FIG. 5A. Is. It should be noted that the drawings are schematic views, and in particular, in FIGS. 3 to 5, for understanding, the thickness in the thickness direction T is drawn thicker than it actually is.

In the state shown in FIG. 1, the pants-type diaper 1 has a longitudinal direction L, a width direction W, and a thickness direction T that are orthogonal to each other, and a longitudinal center line CL that passes through the center of the width direction W and extends in the longitudinal direction L. , A width direction center line CW extending in the width direction W through the center of the longitudinal direction L. The direction and the side approaching the longitudinal centerline CL are defined as the inward direction and the inner side in the width direction W, and the direction and the side away from the longitudinal centerline CL are defined as the outward direction and the outer side in the width direction W, respectively. The direction and the side approaching the width-direction centerline CW are defined as the inward direction and the inner side in the longitudinal direction L, and the direction and the side moving away are the outward direction and the outer side in the longitudinal direction L, respectively.

In addition, the side of the pants-type diaper 1 corresponding to the abdomen of the wearer in the longitudinal direction L is referred to as the front side in the longitudinal direction L, which is the front side in the longitudinal direction L, and the pants-type diaper corresponding to the back of the wearer. The side toward the edge 1 (the edge on the back side) is also referred to as the rear side of the longitudinal direction L.
The “plan view” means that the pants-type diaper 1 in a state of being developed on a plane including the longitudinal direction L and the width direction W is viewed from above in the thickness direction T, and the “planar shape” is grasped in the plan view. Shape.

The “planar direction” is an arbitrary direction parallel to the plane including the width direction W and the longitudinal direction L.
“Skin side” and “non-skin side” respectively mean a side that is relatively closer to the wearer's skin surface and a side that is farther away in the thickness direction T when the pants-type diaper 1 is worn by the wearer. To do.
These definitions are commonly used not only for the pants-type diaper 1 but also for the absorber of the pants-type diaper 1 and each material arranged on them.

In addition, that a member, a structure, a shape, etc. (hereinafter, referred to as "member or the like") is along the longitudinal direction L is not limited to the case where the member or the like is parallel to the longitudinal direction L, but also the component Dx of the member or the like in the longitudinal direction L. , Which is larger than the component Dy of the member or the like in the width direction W (Dx>Dy). Similarly, the member and the like extending in the width direction W are not limited to the case where the member and the like are parallel to the width direction W, and the component Dy of the member and the like in the width direction W is greater than the component Dx of the member and the like in the longitudinal direction L. It also includes a large value (Dy>Dx). For a member or the like having a shape of a curve, a curved surface or the like (hereinafter, referred to as “curve or the like”), the member or the like is evaluated as described above with respect to the tangent line of each point on the curve or the like.

As shown in FIGS. 1 and 2, the pants-type diaper 1 has a plane direction P and a thickness direction T orthogonal to each other, and the plane direction P is the longitudinal direction L and the width direction W of the pants-type diaper 1. including.
The pants-type diaper 1 is located between the abdominal part (abdominal waist belt) 2, the dorsal part (dorsal waist belt) 3, and the abdominal part 2 and the dorsal part 3 in the longitudinal direction L. And an absorbent body 10. In the first embodiment, the pants-type diaper 1 further includes a crotch portion 4 located between the abdominal side portion 2 and the back side portion 3. The abdominal part 2 is a part that comes into contact with the abdomen of the wearer. The back side portion 3 is a portion that contacts the wearer's hip or back. The absorbent main body 10 is a portion that comes into contact with the wearer's crotch, and one end portion in the longitudinal direction L is laminated on the abdominal side portion 2 and the other end portion is laminated on the back side portion 3. The crotch portion 4 is a portion that supports the absorbent main body 10 from the non-skin side.

Both ends 2a, 2a of the abdominal part 2 in the width direction W and both ends 3a, 3a of the back part 3 in the width direction W are joined along the longitudinal direction L, respectively, so that a pants-type diaper 1 is formed. In the pants-type diaper 1, a waist opening through which the wearer's waist passes is defined by the outer end 2e of the abdomen 2 in the longitudinal direction L and the outer end 3e of the back 3 in the longitudinal direction L. .. In the pants-type diaper 1, the pair of leg openings through which the wearer's legs pass is defined by the side portions 5e and 5e on both sides of the crotch portion 4 in the width direction W. In addition, the abdominal part (abdominal waist belt) 2 and the dorsal part (dorsal waist belt) 3 are defined in the range of the longitudinal direction L where both ends 2a, 2a and both ends 3a, 3a are joined. Can be said.

In the first embodiment, in the state shown in FIGS. 1 and 2, each of the abdominal side portion 2 and the dorsal side portion 3 has a rectangular shape that generally extends in the width direction W and is separated from each other in the longitudinal direction L. .. The crotch portion 4 is located between the ventral side portion 2 and the back side portion 3, and both side edges in the width direction W are recessed inward in the width direction W. The abdominal part 2, the crotch part 4, and the back part 3 are integrally formed with each other. In another embodiment (not shown), the ventral portion 2, the crotch portion 4 and the back portion 3 are formed separately from each other. Further, in another embodiment (not shown), the pants-type diaper 1 includes the abdomen 2 and the back 3 and does not include the crotch 4.

In the first embodiment, the abdominal part 2, the dorsal part 3 and the crotch part 4 are provided with a liquid-impermeable cover sheet (sheet member) 5. The cover sheet 5 includes a cover sheet 5a located on the skin side and a cover sheet 5b located on the non-skin side. The cover sheet 5a and the cover sheet 5b are laminated in the thickness direction T and are joined to each other with an adhesive or the like. Both ends in the longitudinal direction L of the cover sheet 5b are folded back to the skin side so as to cover both ends in the longitudinal direction L of the cover sheet 5a. The cover sheets 5b at the folded-back positions on the abdominal portion 2 and the back portion 3 respectively constitute the end portion 2e of the abdominal portion 2 and the end portion 3e of the back portion 3.

In the first embodiment, the abdomen 2 and the back 3 have a plurality of waist gather elastic members 6a and 6b and a plurality of elastic members 7a and 7b between the cover sheet 5a and the cover sheet 5b, respectively. Prepare The plurality of elastic members 6a and 6b are arranged on the outer side and the inner side of the abdominal portion 2 in the longitudinal direction L, respectively. The plurality of elastic members 6a are arranged along the width direction W at intervals in the longitudinal direction L in the respective predetermined regions on both sides of the longitudinal center line CL. The predetermined region is a region from the end portion 2a to a portion inside the opposite end edges in the width direction W of the absorbent main body 10. The plurality of elastic members 6b extend from one end 2a to the other end 2a along the width direction W, and are arranged at intervals in the longitudinal direction L. Similarly, the plurality of elastic members 7 a and 7 b are arranged on the outer side and the inner side of the back side portion 3 in the longitudinal direction L, respectively.

The plurality of elastic members 7a are arranged at intervals in the longitudinal direction L along the width direction W in each predetermined region on both sides of the longitudinal center line CL. The predetermined region is a region from the end portion 3a to a portion inside the opposite end edges in the width direction W of the absorbent main body 10. The plurality of elastic members 7b extend from one end 3a to the other end 3a along the width direction W and are arranged at intervals in the longitudinal direction L. The plurality of elastic members 6a, 6b, 7a, 7b expand and contract the waist opening, and are exemplified by rubber thread. It can be said that the abdominal part (abdominal waist belt) 2 and the dorsal part (dorsal waist belt) 3 are defined in the range of the longitudinal direction L in which the plurality of elastic members 6a, 6b, 7a, 7b are arranged. ..

In the first embodiment, the pants-type diaper 1 is provided with a plurality of elastic members 8 for leg gathers from the crotch portion 4 to the back side portion 3 and the abdominal side portion 2. The plurality of elastic members 8 mainly extend along both ends of the crotch portion 4 in the width direction W along the longitudinal direction L. The plurality of elastic members 8 respectively expand and contract the pair of leg openings, and are exemplified by a rubber thread.

In the first embodiment, the absorbent main body 10 has a substantially rectangular shape and is provided between the liquid permeable sheet 12, the liquid impermeable sheet 13, and the liquid permeable sheet 12 and the liquid impermeable sheet 13. And an absorbent body 14 that absorbs and holds liquid such as urine. Examples of the liquid-permeable sheet 12 include liquid-permeable nonwoven fabrics, woven fabrics, synthetic resin films having liquid-permeable holes formed therein, and composite sheets thereof. Examples of the liquid impermeable sheet 13 include liquid impermeable nonwoven fabrics, synthetic resin films, and composite sheets thereof, such as SMS nonwoven fabrics.

In the first embodiment, the absorbent body 14 includes an absorbent core that absorbs and holds a liquid, and a core wrap that contains the absorbent core. Details of the absorber 14 will be described later. The absorbent body 14, the liquid-permeable sheet 12 and the liquid-impermeable sheet 13 are bonded to each other with an adhesive, and the liquid-permeable sheet 12 and the liquid-impermeable sheet 13 are bonded with an adhesive at their peripheral portions. It is joined. Examples of the adhesive include known materials for pants-type diapers, for example, hot melt adhesive. The shape of the absorbent main body 10 is not limited to the above example as long as it is a shape that is long in the longitudinal direction L, and examples thereof include a rectangular shape with rounded corners, a rectangular shape in which the short sides are convex curves outward, and an hourglass shape. In another embodiment, the liquid-impermeable sheet 13 is omitted, and the non-skin side surface of the absorber 14 and the non-skin side surface of the peripheral portion of the liquid permeable sheet 12 are bonded to the cover sheet 5. There is.

In the first embodiment, the absorbent main body 10 includes a pair of side sheets 17, 17 located on both sides in the width direction W on the skin side surface and extending in the longitudinal direction L. Each side sheet 17 has a leak preventive wall 16 and fixing regions 15 and 15. The fixing regions 15 and 15 are located at the front and rear ends of the side seat 17 in the longitudinal direction L, and are fixed to the skin-side surface of the absorbent main body 10. The leak preventive wall 16 is located between and adjacent to the front and rear fixing regions 15 in the longitudinal direction L of the side sheet 17, is adjacent to the fixing regions 15, and is provided on the skin side surface of the absorbent main body 10 in the width direction W. The outer edge is fixed, and the inner edge in the width direction W is not fixed. The leak-proof wall 16 and the fixing regions 15 and 15 are formed, for example, at the inner side portion of the side seat 17 in the width direction W, and the outer side portion of the side seat 17 in the width direction W is fixed to the absorbent main body 10. ..

The pair of leak preventive walls 16 and 16 are arranged at both ends in the width direction W on the skin side of the absorbent main body 10 so as to face each other, and continuously extend along the longitudinal direction L. Each leak preventive wall 16 includes two elastic members 61 extending in the longitudinal direction L at the inner end in the width direction W. The elastic member 61 is exemplified by a rubber thread. Each of the pair of leak preventive walls 16 and 16 is formed of a hydrophobic sheet, for example, a hydrophobic nonwoven fabric. In another embodiment, each of the pair of leakproof walls 16, 16 is formed of a hydrophilic sheet, for example, a hydrophilic non-woven fabric.

Next, the absorber 14 will be described with reference to FIGS. 1 to 5. The absorber 14 has a first absorption layer 41 arranged on the skin side, a second absorption layer 42 arranged on the non-skin side, and an intermediate part arranged between the first absorption layer 41 and the second absorption layer 42. And layer 43. The absorber 14 has a substantially rectangular planar shape extending in the longitudinal direction L.

In the first embodiment, the first absorbent layer 41 is arranged on the intermediate layer 43 side of the first base material 44 and the first base material 44, and includes a water-absorbent polymer. And a first water absorbent material 45 having a water absorbent material. The first absorbent layer 41 can be regarded as having the first water absorbent material 45 as the absorbent core portion and the first base material 44 (and the intermediate layer 43) as the core wrap. The first water absorbing material 45 is formed by applying an adhesive agent to at least one of the surface of the first base material 44 on the side of the intermediate layer 43 and the surface of the intermediate layer 43 on the side of the first base material 44. And is fixed to at least one of the intermediate layers 43.

The water absorbent material of the first water absorbent material 45 is arranged in the first absorbent layer 41 with a substantially uniform basis weight. The first water absorbent material 45 has a substantially rectangular planar shape. The first base material 44 has a substantially rectangular planar shape and covers the first water absorbent material 45 from the skin side in a plan view, and the peripheral portion of the first base material 44 is slightly around the first water absorbent material 45. Extend outwards.

In the first embodiment, the second absorbent layer 42 is disposed on the second base material 46 formed of a sheet having water retention and liquid diffusibility and on the intermediate layer 43 side with respect to the second base material 46, and absorbs water. A second water absorbent material 47 having a water absorbent material containing a polymer. The second absorbent layer 42 can be regarded as having the second water absorbent material 47 as the absorbent core portion and the second base material 46 (and the intermediate layer 43) as the core wrap. The second water absorbing material 47 is formed by applying an adhesive agent to at least one of the surface of the second base material 46 on the side of the intermediate layer 43 and the surface of the intermediate layer 43 on the side of the second base material 46. And is fixed to at least one of the intermediate layers 43. The water absorbent material of the second water absorbent material 47 is arranged in the second absorbent layer 42 with a substantially uniform basis weight except for the pair of channels 48, 48 (described later).

The second water absorbent material 47 has a substantially rectangular planar shape that is slightly larger than the first water absorbent material 45 in the width direction W and the longitudinal direction L. The second base material 46 has a substantially rectangular planar shape and covers the second water absorbent material 47 from the non-skin side in a plan view, and the peripheral edge portion of the second base material 46 is surrounded by the second water absorbent material 47. It extends slightly outside. Both ends of the second base material 46 in the width direction W cover both side surfaces of the second water absorbent material 47, and also cover the skin-side surface of both ends of the first base material 44 in the width direction W. That is, on the skin-side surface of the end portion of the first absorbent layer 41 in the width direction W, the end portion of the second base material 46 in the width direction W and the end portion of the first base material 44 in the width direction W overlap each other. Have been joined.

Both ends of the second base material 46 in the width direction W cover the side surfaces of the second water absorbent material 47 in the width direction W and further cover the side surfaces of the first base material 44 in the width direction W, whereby the second water absorbent material 47 is formed. Is sealed in the second absorbent layer 42 in the width direction W, and the first water absorbent material 45 is sealed in the first absorbent layer 41 in the width direction W.

In the first embodiment, at both ends of the absorbent body 14 in the longitudinal direction L, the first base material 44, the intermediate layer 43, and the second base material 46 are stacked and joined in the thickness direction T. As a result, the first water absorbent material 45 is enclosed in the first absorbent layer 41 by the first base material 44 and the intermediate layer 43 in the longitudinal direction L, and the second water absorbent material 47 is intermediate with the second base material 46 in the longitudinal direction L. It is enclosed in the second absorption layer 42 by the layer 43.

In the first embodiment, the intermediate layer 43 has a substantially rectangular planar shape in a plan view, and has a low basis weight region LB having a relatively low basis weight and a pair of high basis weights having a relatively high basis weight. And a quantity region HB. Specifically, the intermediate layer 43 includes a pair of high basis weight regions HB arranged at both ends in the width direction W and a low basis weight region LB arranged at the center in the width direction W.

The intermediate layer 43 is composed of a single intermediate sheet 43S having liquid permeability (specifically, an air-through nonwoven fabric containing a core-sheath type composite fiber). The intermediate sheet 43S includes two folding shafts 103 and 104, and the two folding shafts 103 and the first sheet portion 43a disposed inside the folding shafts 104 and the two folding shafts 103 in the expanded state. And a pair of second sheet portions 43b, 43b arranged outside the folding shaft 104. The intermediate layer 43 is formed by folding a single intermediate sheet 43S by the two folding shafts 103 and 104 extending in the longitudinal direction L in the thickness direction T, specifically, the second absorbing layer 42 side. Has been done.

In the intermediate layer 43, the single intermediate sheet 43S is folded by the two folding shafts 103 and 104, and in the plane direction P, the pair of second sheet portions 43b and 43b is the first sheet portion 43a. The pair of second sheet portions 43b, 43b are arranged on both sides in the width direction W, and in the thickness direction T, are arranged on the second absorbent layer 42 side. A portion where the first sheet portion 43a and each of the pair of second sheet portions 43b and 43b overlap in the thickness direction T constitutes a pair of overlapping portions OP of the intermediate layer 43, and A portion of the sheet portion 43a that does not overlap the pair of second sheet portions 43b and 43b in the thickness direction T constitutes a non-overlapping portion NP. Each of the pair of overlapping parts OP corresponds to each of the pair of high basis weight regions HB, and the non-overlapping part NP corresponds to the low basis weight region LB.

In the intermediate layer 43, in the pair of high basis weight regions HB (the pair of overlapping portions OP), the first sheet portion 43a and the second sheet portion 43b are extended by the pair of embossed portions 43c along the longitudinal direction L. It is joined.

In the intermediate layer 43, the fiber density of the conjugate fiber in the pair of embossed portions 43c is higher than the fiber density of the conjugate fiber in the portion other than the pair of embossed portions 43c.
In other words, the intermediate layer 43 is divided into a pair of high fiber density portions HD configured by a pair of embossed portions 43c and three low fiber density portions LD configured by a portion other than the pair of embossed portions 43c. To be done.

The pair of high fiber density portions HD extend in the longitudinal direction L and are arranged at predetermined intervals on both sides in the width direction W with the longitudinal centerline CL interposed therebetween.
In the pair of high fiber density portions HD, the liquid that has reached the first absorbent layer 41 tends to stay around the first water absorbent material 45 of the first absorbent layer 41, but stays around the first water absorbent material 45. The generated liquid can be drawn into the pair of high fiber density portions HD (the pair of embossed portions 43c) and further to the intermediate layer 43 by the capillary phenomenon.

Further, since each of the pair of high fiber density portions HD extends in the longitudinal direction L, the liquid drawn into the pair of high fiber density portions HD can be easily diffused in the longitudinal direction L in the intermediate layer 43. Next, the liquid that has diffused in the intermediate layer 43 in the longitudinal direction L easily migrates to the second absorption layer 42.

The pair of high fiber density portions HD are arranged in the pair of high basis weight areas HB (the pair of overlapping portions OP) described above. Therefore, the amount of the composite fibers forming the high fiber density portion HD becomes relatively large, and the liquid staying around the first water absorbent material 45 is retained by the pair of high fiber density portions HD (the pair of embossed portions) by the capillary phenomenon. 43c) and then the liquid can be drawn into the intermediate layer 43 for primary storage.

In the intermediate layer 43, the intermediate sheet 43S has a net surface (not shown) in contact with the net (placement surface) when forming the air-through nonwoven fabric, and a non-net surface (not shown) opposite to the net. Is equipped with. The net surface has a relatively higher fiber density than the non-net surface. Since the intermediate sheet 43S is folded with the net surface inside, the intermediate layer 43 is configured such that the fiber density inside the intermediate layer 43 is higher than the fiber density on the skin side surface.

Therefore, the liquid drawn by the intermediate layer 43 can be easily transferred from the skin side surface to the inside and then to the clothing surface (not shown) by the capillary phenomenon, and thus the liquid transferred to the clothing surface of the intermediate layer 43. Can be easily transferred to the second absorption layer 42. In addition, the skin side surface (non-net surface) of the intermediate layer 43 having a relatively low fiber density can hold the first water absorbent material 45 contained in the first absorbent layer 41, and the holding property of the super absorbent polymer. Excellent in

The pair of high basis weight regions HB is composed of a pair of overlapping portions OP, and in the pair of overlapping portions OP, the first sheet portion 43a and the second sheet portion 43b are stacked in the thickness direction T. There is. Since the first sheet portion 43a and the second sheet portion 43b are not connected except for the pair of embossed portions 43c and the two folding shafts 103 and 104, the pair of high fiber density portions of the intermediate layer 43. When the HD draws in the liquid, the pair of overlapping portions OP forming the pair of high basis weight regions HB are arranged in the thickness direction with the two folding shafts 103 and 104 and the pair of embossing portions 43c as base points. Since it can spread to T, the pair of high basis weight regions HB (the pair of overlapping portions OP) of the intermediate layer 43 can store the liquid more temporarily.

The pair of high fiber density portions HD is composed of a one sheet portion 43a and an embossed portion 43c that embosses the second sheet portion 43b. In the embossed portion 43c, the one sheet portion 43a and the second sheet portion 43c. 43b is connected.
Therefore, the pair of high fiber density portions HD of the intermediate layer 43 draws in the liquid, and the pair of overlapping portions OP in which the pair of high fiber density portions HD are arranged have the two folding axes 103 and 104 as base points. Even in the case of expanding in the thickness direction T, the pair of high fiber density portions HD (embossed portions 43c) can suppress the twist of the absorber 14.

In the middle layer 43, both end edges in the width direction W are sandwiched between and joined to both end portions in the width direction W of the first base material 44 and the second base material 46, and both ends in the longitudinal direction L. The edges are sandwiched between and joined to both ends of the first base material 44 and the second base material 46 in the longitudinal direction L.

The absorber 14 has a pair of channels 48, 48 extending along the longitudinal direction L. The pair of channels 48, 48 are arranged in the second absorption layer 42, extend in the longitudinal direction L, and are strip-shaped regions arranged at predetermined intervals on both sides in the width direction W with the longitudinal centerline CL interposed therebetween. Is. The channel 48 is arranged at least at the center of the second absorption layer 42 in the longitudinal direction L so as to straddle the width-direction center line CW.

Each of the pair of channels 48, 48 is an area in which the basis weight of the second water absorbent material 47 is smaller than the area around each of the pair of channels 48, 48. Each of the pair of channels 48, 48 is formed such that the second base material 46 is recessed toward the intermediate layer 43 side, that is, the second water absorbing material 47 is recessed toward the intermediate layer 43 side.

Each of the pair of channels 48, 48 is arranged so as to overlap the pair of high basis weight regions HB (the pair of overlapping portions OP) of the intermediate layer 43 in the thickness direction T.
Further, the pair of channels 48, 48 are arranged so as to overlap the pair of embossed portions 43c in the thickness direction T. In other words, each of the pair of high fiber density portions HD in the thickness direction T. , And each of the pair of channels 48, 48 overlaps. Thereby, the liquid drawn by the pair of high fiber density portions HD of the intermediate layer 43 is moved to the pair of channels 48, 48 of the second absorption layer 42, and the liquid is passed through the pair of channels 48, 48 to the second absorption layer. It can be diffused into layer 42.

The first water-absorbing material 45 and the second water-absorbing material 47 include super absorbent polymer (Super Absorber Polymer; SAP). The basis weight of the superabsorbent polymer of each of the first water absorbent material 45 and the second water absorbent material 47 can be appropriately adjusted according to the absorption performance required for the pants-type diaper 1, but for example, each is 10 to 500 g/m 2. ² , and preferably 100 to 400 g/m ² .

One of the basis weights of the first water absorbent material 45 and the second water absorbent material 47 may be larger than the other, or may be the same. However, “equal” means a range where one is within ±30% of the other. The first water absorbent material 45 and the second water absorbent material 47 may further include hydrophilic fibers such as water absorbent fibers (for example, pulp fibers). The ratio of the super absorbent polymer in the first water absorbent material 45 and the second water absorbent material 47 is, for example, 80 to 100% by mass, preferably 90 to 100% by mass, and more preferably 95 to 100% by mass. is there.
Therefore, it can be said that the first water absorbent material 45 and the second water absorbent material 47 contain the super absorbent polymer as a main component, and the absorber 14 can be called a so-called SAP sheet.

However, as a ratio of the super absorbent polymer in the absorber 14 (including not only the first water absorbing material 45 and the second water absorbing material 47, but also the adhesive, the first base material 44, the intermediate layer 43, and the second base material 46). Is, for example, 40 to 80% by mass, preferably 50 to 80% by mass, and more preferably 60 to 80% by mass.

In the first embodiment, each of the first water-absorbent material 45 and the second water-absorbent material 47 is composed only of a superabsorbent polymer and does not contain hydrophilic fibers.

The superabsorbent polymer preferably has 90 to 100% by mass of superabsorbent polymer particles having a particle diameter of 150 to 500 μm. The superabsorbent polymer particles having the above particle size have a small particle size and are uniform, so that they are easily held by the adhesive. The particle size of the super absorbent polymer particles is measured according to the sieving test method described in JIS R 6002:1998.

The adhesive is not particularly limited as long as it is an adhesive that can fix the superabsorbent polymer, and examples thereof include hot melt adhesives. The application pattern of the adhesive is not particularly limited, and examples thereof include a continuous or intermittent omega pattern, a spiral pattern, and a line pattern. The basis weight of the adhesive may be appropriately adjusted so that the liquid absorbency of the absorbent body 14 is not significantly reduced, and examples thereof include 3 to 50 g/m ² for each layer. However, each layer is an adhesive layer between the first water absorbing material 45 and the first base material 44, an adhesive layer between the first water absorbing material 45 and the intermediate layer 43, and a second water absorbing material 47 and the second water absorbing material 47. It means an adhesive layer between the second base material 46 and the adhesive layer between the second water absorbing material 47 and the intermediate layer 43.

The first base material 44 is not particularly limited as long as it is a sheet having liquid permeability. Examples of the first base material 44 include a liquid-permeable non-woven fabric containing synthetic fibers, a hydrophilic non-woven fabric, and a laminated non-woven fabric thereof, among which a non-woven fabric having high water permeability is preferable. Examples of the first base material 44 include polyolefin fibers such as polyethylene (PE) and polypropylene (PP), polyester fibers such as polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), and polyethylene naphthalate (PEN). , Or a spunbonded non-woven fabric, an air-through non-woven fabric and the like formed from a combination thereof.
The synthetic fibers are preferably hydrophilized by a known method.

The sheet having liquid permeability is, for example, pulp fiber, hydrophilic fiber such as rayon fiber, an air-laid nonwoven fabric coated with a hydrophilic binder, the hydrophilic fiber, a nonwoven fabric in which the synthetic fiber is combined, for example, a spun. It can be a lace nonwoven. In the first embodiment, an air-laid non-woven fabric in which pulp fibers having liquid permeability and liquid holding property are coated with a hydrophilic binder is used.

The first base material 44 may be formed by laminating a plurality of non-woven fabrics of one or more types among the above-mentioned non-woven fabrics.
The basis weight of the first base material 44 is, for example, 10 to 100 g/m ² , and preferably 20 to 80 g/m ² . The thickness of the first base material 44 is, for example, 0.1 to 5 mm, and preferably 0.15 to 3 mm.

The second base material 46 is not particularly limited as long as it is a sheet having water retention and liquid diffusion properties. The second base material 46 is formed of, for example, synthetic fiber such as polyamide fiber, regenerated fiber such as rayon fiber, acetate fiber, natural fiber such as cotton, silk, hemp, pulp (cellulose) fiber, or a combination thereof. The non-woven fabric is used. Specifically, examples of the second base material 46 include spunbonded nonwoven fabric containing nylon, spunlace nonwoven fabric containing rayon fibers and/or pulp fibers, and the like. The spunlaced nonwoven fabric containing rayon fibers and/or pulp fibers may contain polyolefin fibers and/or polyester fibers. In the first embodiment, a spunlace nonwoven fabric containing rayon fibers and pulp fibers, which has liquid retaining properties and liquid diffusing properties, is used.

The second base material 46 may be composed of one of the above-mentioned nonwoven fabrics, and may be a laminate of a plurality of the above-mentioned nonwoven fabrics.
The basis weight of the second base material 46 is, for example, 10 to 200 g/m ² , and preferably 35 to 150 g/m ² . The thickness of the second base material 46 is, for example, 0.1 to 5 mm, and preferably 0.15 to 3 mm.

Examples of the intermediate layer 43 (intermediate sheet 43S) include a sheet similar to the first base material 44. The basis weight of the intermediate layer 43 is, for example, 10 to 100 g/m ² , and preferably 15 to 80 g/m ² . The thickness of the intermediate layer 43 is, for example, 0.1 to 5 mm, and preferably 0.15 to 3 mm.

In the first embodiment, as shown in FIG. 5, the absorbent body 14 includes a back side area BA, a ventral side area FA, and a crotch area MA that are arranged along the longitudinal direction L. However, the back side region BA is a region overlapping the back side portion 3 of the absorber 14 in the thickness direction T. The abdominal area FA is an area that overlaps the abdominal portion 2 of the absorber 14 in the thickness direction T. The crotch region MA is a region located between the back region BA and the abdominal region FA of the absorber 14, that is, a region overlapping the crotch portion 4 in the thickness direction T. Therefore, the absorbent body 14 is divided along the longitudinal direction L into a dorsal region BA overlapping with the dorsal part 3, an abdominal region FA overlapping with the abdominal part 2, and a crotch region MA overlapping with the crotch part 4. It

In the first embodiment, the absorber 14 includes the SAP high basis weight region 14a, the SAP low basis weight region 14b, and the SAP non-arrangement region 14c. The SAP high basis weight region 14a is a region in which the basis weight of the super absorbent polymer is relatively high, and is a region in which the first absorbent layer 41 and the second absorbent layer 42 overlap in the thickness direction T. The SAP low basis weight region 14b is a region in which the basis weight of the super absorbent polymer is relatively low, and the first absorbent layer 41 does not exist in the thickness direction T, and only the second absorbent layer 42 exists. .. The SAP non-arrangement region 14c is a region that does not contain a super absorbent polymer, and is a region in which the first absorption layer 41 and the second absorption layer 42 do not exist in the thickness direction T. However, not including the super absorbent polymer includes a case where the super absorbent polymer exists but its basis weight is very small. "Very low" means that the basis weight of the superabsorbent polymer is 5% or less of the basis weight of the superabsorbent polymer in the SAP high basis weight region 14a.

Therefore, in the absorber 14, the back side area BA includes the back side SAP high basis weight area BAa as the SAP high basis weight area 14a, the back side SAP low basis weight area BAb as the SAP low basis weight area 14b, and the SAP. The back side SAP non-arrangement area BAc is provided as the non-arrangement area 14c. In the absorber 14, the abdominal area FA includes an abdominal SAP high basis weight area FAa as the SAP high basis weight area 14a and an abdominal SAP non-arrangement area FAc as the SAP non-arrangement area 14c. , The ventral SAP low basis weight area FAb is not provided. The crotch region MA has only the SAP high basis weight region 14a.
Therefore, the basis weight of the super absorbent polymer in the back SAP high basis weight region BAa and the abdominal SAP high basis weight region FAa is equivalent to the basis weight of the super absorbent polymer in the crotch region MA. The term “equivalent” means that one is in the range of 0.7 to 1.3 times (±30%) that of the other.

The second absorbent layer 42 includes, at a rear end in the longitudinal direction L, a projecting portion projecting outward from the end edge of the first absorbent layer 41 in a plan view. The protrusion includes the back SAP low basis weight region BAb, and the protrusion is the same as the back SAP low basis weight region BAb. The second absorbent layer 42 is covered with the intermediate layer 43, and thus the protruding portion, that is, the back SAP low basis weight region BAb is covered with the intermediate layer 43 and the first base material 44 on the skin side.

In the absorbent body 14, in the longitudinal direction L, the length of the back SAP high basis weight area BAa is da2, the length of the back SAP low basis weight area BAb is db2, and the length of the back SAP non-arrangement area BAc. Is dc2, db2>dc2>da2. That is, in the back side area BA, the length of the back side SAP low grammage area BAb is relatively lengthened to keep the grammage of the superabsorbent polymer low as a whole, and to the rear side of the longitudinal direction L. A super absorbent polymer is arranged. Although the amount is small, it is possible to easily prevent the leakage of the liquid flowing to the back side.

In the absorbent body 14, in the longitudinal direction L, when the length of the abdominal SAP high basis weight area FAa is da1 and the length of the abdominal SAP non-arrangement area FAc is dc1, da1>dc1. That is, in the abdominal area FA, the length of the abdominal SAP high basis weight area FAa is relatively increased to increase the basis weight of the superabsorbent polymer as a whole to the end portion on the front side in the longitudinal direction L. A super absorbent polymer is arranged. As a result, it is possible to make it easier to properly absorb the liquid on the abdominal side, which has a large excretion amount.

In the absorber 14, dc2>dc1 in the longitudinal direction L. The length of the ventral SAP non-placement area FAc is made relatively long by suppressing the use amount of the super absorbent polymer in the back area BA with a small excretion amount by making the length of the back SAP non-placement area BAc relatively long. Can be made relatively short to facilitate accurate absorption of the liquid in the abdominal region FA, which has a large excretion amount.

Note that in another embodiment, in the absorber 14, in the longitudinal direction L, da2+db2>da1. In this case, by disposing the superabsorbent polymer in the longitudinal direction L in the back side region BA to the rear side portion, it is possible to more easily suppress the transmission leakage of the liquid flowing to the back side although the amount is small.

Next, a method for manufacturing the absorber 14 will be described.
First, the hot-melt adhesive is applied onto the sheet for the second base material 46 while moving the sheet for the second base material 46 in the longitudinal direction L. Then, the super absorbent polymer is supplied from the super absorbent polymer supply device along the longitudinal direction L on both end portions and the central portion in the width direction W of the sheet for the second base material 46 coated with the hot melt adhesive. And spray. At that time, a small amount of the superabsorbent polymer migrates to a region (corresponding to a channel) between both end portions and the central portion. Next, the sheet for the intermediate layer 43, the hot melt adhesive of which is applied on both sides, is laminated on the super absorbent polymer on the sheet for the second base material 46.

Next, while moving the laminate in the longitudinal direction L, a superabsorbent polymer is supplied from another superabsorbent polymer supply device to the central portion in the width direction W of the intermediate layer 43 sheet coated with the hot melt adhesive. Spray along the longitudinal direction L. Next, the sheet for the first base material 44 in which the hot melt adhesive is applied is laminated on the super absorbent polymer on the sheet for the intermediate layer 43, with the hot melt adhesive being on the super absorbent polymer side. Then, both sides of the sheet for the second base material 46 in the width direction W are folded back to both sides of the sheet for the first base material 44 in the width direction W to obtain a laminate. After that, the thickness of the laminate is adjusted by passing the laminate through a pair of press rolls, that is, by pressing, and the absorber 14 is obtained.

Next, a method for manufacturing a pants-type diaper using the absorber 14 will be described.
The liquid permeable sheet 12 is attached to the upper surface (the surface of the first base material 44) of the absorber 14 manufactured as described above, and the liquid impermeable to the lower surface (the surface of the second base material 46) of the absorbent body 14. The sheet 13 is attached to obtain a laminated body. Next, the side sheets 17 with the leak preventive wall 16 are attached to both sides of the laminate in the width direction W to obtain the absorbent main body 10. Then, the absorptive main body 10 is pasted on the cover sheet 5 (including the elastic members 6, 7, and 8), and the abdominal portion 2 in the width direction W at both ends 2a, 2a and the back side portion 3 in the width direction W is attached. The both ends 3a, 3a are joined. Thereby, the pants-type diaper 1 is manufactured.

Absorbent articles including the absorbent body of the present disclosure are not particularly limited, and examples thereof include disposable diapers, incontinence pads, disposable shorts, sanitary napkins, shorts-type sanitary napkins, panty liners, puerperium pads, breast pads, and hemorrhoid pads. , Sweat removal pads, pressure ulcer sheets (dressing sheets), diapers for pets, sheets for pets, and the like.

In the absorbent body of the present disclosure, the intermediate layer includes fibers and has a low fiber density portion having a relatively low fiber density and a high fiber density portion having a relatively high fiber density. As a result, the high fiber density portion of the intermediate layer can reach the first absorbent layer and draw in the liquid staying around the first water absorbent material.

The high fiber density portion is preferably 1.2 times or more, more preferably 1.5 times or more, further preferably 2.0 times or more, and even more preferably 3.0 times or more, than the low fiber density portion. It has a high fiber density. This is from the viewpoint of the above effects. Further, the high fiber density portion has a fiber density which is preferably 50 times or less, more preferably 40 times or less, and further preferably 30 times or less than that of the low fiber density portion. This is to prevent the wearer from learning hardness in the high fiber density portion.

When the high fiber density portion and the low fiber density portion have the same basis weight, the high fiber density portion is preferably 1/1.2 times (about 0. 83 times) or less, more preferably 1/1.5 times (about 0.67 times) or less, further preferably 1/2.0 times (0.5 times) or less, and even more preferably 1/3.0 times. Has a height no more than double. This is from the viewpoint of the above effects. Further, the high fiber density portion is preferably 1/50 times (0.020 times) or more, more preferably 1/40 times (0.025 times) or more, further preferably 1/50 times as high as the low fiber density portion. It has a thickness of 30 times (about 0.033 times) or more. This is to prevent the wearer from learning hardness in the high fiber density portion.

The thickness of the high fiber density part and the thickness of the low fiber density part are measured by a three-dimensional measurement X-ray CT device (Yamato Scientific Co., Ltd. TDM-1000-IS/SP). Specifically, the thickness of a desired density part (high fiber density part or low fiber density part) is arbitrarily measured at 20 points from an image scanned using a three-dimensional measurement X-ray CT apparatus, and averaged. It is determined.

The high fiber density portion preferably extends in a predetermined direction within the plane direction, and preferably extends in the longitudinal direction of the absorbent body. The liquid drawn in by the high fiber density portion of the intermediate layer can be diffused in a predetermined direction in the plane direction of the intermediate layer, particularly in the longitudinal direction, and then the liquid diffused in the plane direction is in the thickness direction, that is, This is because it is easy to move to the second absorption layer.

In the absorber of the present disclosure, the intermediate layer may include a low basis weight region having a relatively low basis weight and a high basis weight region having a relatively high basis weight in the plane direction. In that case, it is more preferable that the high fiber density portion is arranged in the high basis weight region. The amount of fibers constituting the high fiber density portion becomes relatively large, and the liquid that reaches the first absorbent layer and stays around the first water absorbing material can be drawn in by the high fiber density portion, and then the liquid. This is because the water can be drawn into the intermediate layer and temporarily stored.

In the absorbent body of the present disclosure, the intermediate layer is composed of an intermediate sheet that is folded in the thickness direction of the absorbent body at a predetermined folding axis, and the intermediate layer is such that the intermediate sheets overlap in the thickness direction of the absorbent body. The overlapping portion and the non-overlapping portion where the intermediate sheet does not overlap in the thickness direction of the absorber can be partitioned. In that case, the high grammage region can be composed of an overlapping portion or a non-overlapping portion, and is preferably composed of an overlapping portion. When the high fiber density portion of the intermediate layer draws in the liquid, the high grammage region is constituted by the overlapping portion, so that the overlapping portion constituting the high grammage region is formed in the thickness direction with the folding axis as a base point. Since the liquid can be spread, the high basis weight region (overlapping part) of the intermediate layer can temporarily store the liquid.
In addition, from the viewpoint that the overlapping portion can be expanded in the thickness direction, it is preferable that the portions of the intermediate sheet forming the overlapping portion are not fixed to each other except the high basis weight region.

In the absorbent body of the present disclosure, the intermediate layer (intermediate sheet) including the high fiber density portion and the low fiber density portion is not particularly limited, and those known in the art can be used. For example, a non-woven fabric having a high fiber density portion and a low fiber density portion is manufactured according to the descriptions in JP 2008-138340 A, JP 2008-144322 A, JP 2008-264084 A, JP 2008-266813 A and the like. can do.

The intermediate layer (intermediate sheet) including the high fiber density portion and the low fiber density portion is a non-woven fabric having convex portions (for example, ridges) having different basis weights and concave portions (for example, groove portions), specifically, Examples of the nonwoven fabric include a convex portion (for example, a ridge portion) that constitutes a high fiber density portion and a concave portion (for example, a groove portion) that constitutes a low fiber density portion. Such a non-woven fabric can be produced according to the description of JP-A-2008-002034, JP-A-2008-023311 and the like.

Further, the intermediate layer (intermediate sheet) having the high fiber density portion and the low fiber density portion can also be formed by gear stretching of the nonwoven fabric.
Further, the intermediate layer (intermediate sheet) having the high fiber density portion and the low fiber density portion compresses the folded intermediate sheet or the unfolded intermediate sheet in the thickness direction, for example, embossing (embossing portion). It can also be formed by

In the absorbent body of the present disclosure, the fiber density in the thickness direction of the intermediate layer can be arbitrary, for example, the skin side can have a low fiber density, the clothing side can have a high fiber density, and the skin side and The clothing side can have a low fiber density and the interior can have a high fiber density.
In the absorbent body of the present disclosure, the intermediate layer includes the skin side surface, and the fiber density inside the middle layer can be higher than the fiber density on the skin side surface. Thereby, the liquid drawn by the intermediate layer is easily transferred from the skin side surface to the inside of the intermediate layer and then to the clothes surface by the capillary phenomenon, and the liquid transferred to the clothes surface of the intermediate layer is second It becomes easy to transfer to the absorption layer.

In the absorbent body of the present disclosure, the intermediate layer can be formed of an intermediate sheet including a first surface having a relatively low fiber density and a second surface having a relatively high fiber density. However, the first surface having a low fiber density may be arranged on the skin side, and the second surface having a high fiber density may be arranged on the clothing side. This facilitates the transfer of the liquid that has reached the intermediate layer to the second absorption layer due to the capillary phenomenon.

Moreover, in the absorber of this indication, an intermediate|middle layer is an intermediate|middle sheet provided with the 1st surface with a comparatively low fiber density, and the 2nd surface with a comparatively high fiber density, Comprising: The inner surface may be configured to be folded along a predetermined folding axis. As a result, the liquid that has reached the intermediate layer is easily transferred to the second absorbent layer by the capillary phenomenon, and the intermediate sheet is formed of the superabsorbent polymer of the first absorbent layer and the superabsorbent polymer of the second absorbent layer. And can hold.

The intermediate sheet including the first surface having a relatively low fiber density and the second surface having a relatively high fiber density includes, for example, a non-woven fabric manufactured on a net. For example, an air-through nonwoven fabric is formed by placing a web on a net and fusing constituent fibers together. At that time, the net surface which was in contact with the net had a relatively high fiber density and constituted the second surface, and the non-net surface which was not in contact with the net had a relatively low fiber density and the first surface. Make up.

In the absorber of the present disclosure, the intermediate sheet forming the intermediate layer can be folded to the liquid impermeable sheet side. Thereby, a sheet member adjacent to the liquid permeable sheet side of the intermediate layer is less likely to have a gap between the intermediate layer, and the liquid that reaches the liquid permeable sheet is easily received by the intermediate sheet from the sheet member. Become.

In the absorber of the present disclosure, each of the first absorbent layer and the second absorbent layer contains a super absorbent polymer. The superabsorbent polymer is not particularly limited and includes those known in the art, and examples thereof include starch-based, cellulose-based and synthetic polymer-based superabsorbent polymers. Examples of the starch-based or cellulose-based superabsorbent polymer include starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, and sodium carboxymethylcellulose crosslinked product. Examples of the highly water-absorbing polymer of the system include, for example, polyacrylate, polysulfonate, maleic anhydride, polyacrylamide, polyvinyl alcohol, polyethylene oxide, polyaspartate, polyglutamate. , Polyalginate-based, starch-based, cellulose-based superabsorbent polymers (SAP, Superabsorbent Polymer), and the like, and polyacrylate-based (particularly sodium polyacrylate-based) superabsorbent polymers are preferred. ..

In the absorbent body of the present disclosure, each of the first absorbent layer and the second absorbent layer is not particularly limited as long as it is mainly composed of a super absorbent polymer, and may further include hydrophilic fibers such as pulp fibers. Good. The shape of the absorber is not particularly limited in plan view, and examples thereof include a rectangle with short sides protruding in an arc shape, a rounded rectangle, an ellipse, and an hourglass. The thickness of the absorbent body is, for example, 0.5 to 20 mm, preferably 1 to 10 mm.

The absorber of the present disclosure can include channels. The channels may be arranged in the first absorbent layer and/or the second absorbent layer. Thereby, when the absorbent article is worn, it becomes easy to induce deformation of the absorber, and thus the absorbent article. From this viewpoint, it is preferable that the channels extend along the longitudinal direction, and it is more preferable that the pair of channels extend along the longitudinal direction with the longitudinal centerline interposed therebetween.
Moreover, it is preferable that the channel (a pair of channels) is arranged in the second absorption layer. This is because it is easy to induce deformation of the absorbent article.

The pair of channels may be arranged such that, in a plan view, the distance between the pair of channels is constant along the longitudinal direction of the absorber, and the distance between the pair of channels is, for example, absorption. It may be arranged so as to be narrow in the vicinity of the center in the longitudinal direction of the sexual article and to expand toward both outer sides in the longitudinal direction.

The channel (pair of channels) is arranged in the second absorbent layer, and the channel (pair of channels) is arranged so as to overlap the high fiber density portion of the intermediate layer in the thickness direction of the absorbent body. You can Thereby, the liquid drawn in by the high fiber density portion of the intermediate layer can be moved to the channel of the second absorption layer, and the liquid can be diffused to the second absorption layer through the channel.

In the absorbent body according to the present disclosure, the channel (a pair of channels) is formed in the absorbent core as compared with the absorbent layer in which the channel is arranged, that is, the area around the first absorbent layer and/or the second absorbent layer. It means an area with a low basis weight. The channel (a pair of channels) is preferably 70% by mass or less, more preferably, as compared with the absorption layer in which the channel is arranged, that is, the region around the first absorption layer and/or the second absorption layer. It has a basis weight of 50% by weight or less, and more preferably 30% by weight or less, and may have a basis weight of 0% by weight. This is because the channel is the starting point of change guidance.

1 Pants-type diaper 2 Ventral region (ventral waist belt)
3 Dorsal part (dorsal waist belt)
4 Crotch parts 5, 5a, 5b Cover sheet 10 Absorbent body 12 Liquid permeable sheet 13 Liquid impermeable sheet 14 Absorber 41 First absorbent layer 42 Second absorbent layer 43 Intermediate layer 43S Intermediate sheet 43a First sheet portion 43b Second sheet portion 43c Embossed portion 44 First base material 45 First water absorbent material 46 Second water absorbent material 47 Second water absorbent material 48 Channels 103, 104 Folding axis L Longitudinal direction W Width direction T Thickness direction CL Longitudinal center line CW Width center line LB Low basis weight area HB High basis weight area OP Overlapping area NP Non-overlapping area HD High fiber density area LD Low fiber density area

Claims (9)

It is provided with a first absorbent layer containing a super absorbent polymer, a second absorbent layer containing a super absorbent polymer, and an intermediate layer containing fibers, which is arranged between them. An absorbent body for an absorbent article, comprising:
The intermediate layer has a low fiber density portion having a relatively low fiber density and a high fiber density portion having a relatively high fiber density,
The said absorber, characterized by the above-mentioned. The absorbent body according to claim 1, wherein the high fiber density portion extends in a predetermined direction within the plane direction. The intermediate layer includes a high basis weight region having a relatively high basis weight and a low basis weight region having a relatively low basis weight, and the high fiber density portion is arranged in the high basis weight region. The absorbent body according to claim 1 or 2. The intermediate layer is composed of an intermediate sheet that is folded in the thickness direction in a predetermined folding axis, and the intermediate layer is an overlapping portion in which the intermediate sheet overlaps in the thickness direction, The absorbent body according to claim 3, wherein the intermediate sheet is partitioned into non-overlapping portions that do not overlap in the thickness direction, and the high-basis-weight region includes the overlapping portions. The absorbent body according to claim 4, wherein the high fiber density portion is an embossed portion that embosses the overlapping portion. The absorbent body according to any one of claims 1 to 5, wherein the intermediate layer has a skin side surface, and a fiber density inside the middle layer is higher than a fiber density on the skin side surface. An intermediate sheet, wherein the intermediate layer includes a first surface having a relatively low fiber density and a second surface having a relatively high fiber density, and the second surface is an inner surface, and at a predetermined folding axis. The absorbent body according to claim 6, which is configured by being folded. The absorber has a longitudinal direction and a width direction,
The second absorbent layer is provided with a pair of channels extending in the longitudinal direction and spaced apart in the width direction with a longitudinal centerline of the absorber interposed therebetween.
The high fiber density portion, in the thickness direction, overlaps with each of the pair of channels,
The absorbent body according to any one of claims 1 to 7. A liquid-permeable sheet, a liquid-impermeable sheet, an absorbent article comprising an absorber arranged between them,
The absorbent body is the absorbent body according to any one of claims 1 to 8.
The absorbent article.

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