JP2020108750A - Absorbent article - Google Patents

Abstract

To provide an absorbent article that has superior temporary liquid retentivity and superior indicating ability of an indicator.SOLUTION: An absorbent article 1 is provided with a liquid-permeable sheet 12, a liquid-impermeable sheet 13, and, disposed therebetween, an intermediate layer 43 and an absorber 14 containing a superabsorbent polymer, the absorbent article having a thickness direction T and a planar direction P, in which: the intermediate layer 43 is provided, in the planar direction P thereof, with a low-basis-weight area LB having a relatively low basis weight and a high-basis-weight area HB having a relatively high basis weight; and the absorbent article 1 is further provided with an indicator 101 that is disposed so as to overlap the low-basis-weight area LB in the thickness direction T.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to absorbent articles.

BACKGROUND ART As an absorbent material, an absorbent article including an absorbent body containing a relatively large amount of super absorbent polymer (SAP) is known.
For example, Patent Document 1 discloses a diaper or training pants having a front edge portion (10), a rear edge portion (12), and two side edge portions (13, 14) extending in the longitudinal direction. An absorbent article (20), the absorbent article comprising a topsheet (24), a backsheet (25), and an absorbent core (28) between the topsheet and the backsheet, the absorbent article comprising: The absorbent core comprises a core wrap (16, 16') encapsulating an absorbent material (60) comprising superabsorbent polymer particles, said core wrap comprising a top side (288) and a bottom side (290). The core comprises at least two longitudinally extending channel forming areas (26a,b) substantially free of absorbent material, through which the upper side of the core wrap is the core wrap. Is attached to the bottom side such that when the absorbent material absorbs liquid and swells, the core wrap is along those areas (26a,b) substantially free of absorbent material. To form channels (26'a,b), the absorbent article being between two channel forming areas (26a,b) and/or the channel forming area (26a) so that the absorbent article is visible from the outside of the article. , B) and any of the longitudinally extending side edges (13, 14) of the article, further comprising a wetness indicator (100). Articles are disclosed.

The absorbent article described in Patent Document 1 can make the absorbent article thinner than the conventional absorbent body containing pulp fibers, and thus can give the absorbent article a clean impression. it can.

In the absorbent article described in Patent Document 1, in order to compensate for the slow absorption of the liquid by the superabsorbent polymer, a temporary storage layer that temporarily stores the liquid, specifically, a capture and/or distribution layer. 54 can be arranged. As a result, the liquid that has reached the absorbent article is unlikely to leak to the outside of the absorbent article, and the absorbent article has excellent temporary storage properties for the liquid.

Japanese Patent Publication No. 2017-501768

When the absorbent article described in Patent Document 1 includes the acquisition and/or distribution layer 54, the liquid reaching the absorbent article remains in the acquisition and/or distribution layer 54, and the wetness indicator (100 ) Is difficult to reach, and the wetness indicator (100) may have difficulty in exerting its function, and it is difficult for the user of the absorbent article to grasp that the absorbent article has absorbed the liquid, and There was a risk of missing the timing of exchanging the sex article.
Therefore, an object of the present disclosure is to provide an absorbent article that is excellent in the temporary storage property of liquid and the indicator property of the indicator.

The present disclosure includes a liquid-permeable sheet, a liquid-impermeable sheet, and an absorbent body and an intermediate layer that are disposed between them and that include a superabsorbent polymer, and a thickness direction and a flat surface. An absorbent article having a direction, wherein the intermediate layer includes 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. The present invention has found that the absorbent article further includes an indicator arranged so as to overlap the low basis weight region in the thickness direction.

The absorbent article of the present disclosure is excellent in the temporary storage property of liquid and the indicator property of the indicator.

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. 1. FIG. 4 is a cross-sectional view of the absorber 14 taken along the line III-III in FIG. 1. FIG. 5 is a diagram for explaining the absorber 14. FIG. 6 is a diagram for explaining the pants-type diaper according to the second embodiment.

Specifically, the present disclosure relates to the following aspects.
[Aspect 1]
A liquid-permeable sheet, a liquid-impermeable sheet, and an absorbent body and an intermediate layer, which are arranged between them, and which include a superabsorbent polymer, and have a thickness direction and a plane direction. An article,
The intermediate layer, in the plane direction, comprises a low basis weight region having a relatively low basis weight and a high basis weight region having a relatively high basis weight,
The absorbent article, in the thickness direction, further comprises an indicator arranged to overlap the low basis weight region,
The absorbent article described above.

The absorbent article includes an intermediate layer having a low basis weight region and a high basis weight region, and an indicator arranged so as to overlap the low basis weight region of the intermediate layer. The high grammage region of, while temporarily storing the liquid, it is possible to suppress the liquid from leaking from the absorbent article, the low grammage region of the intermediate layer allows the liquid to permeate, the liquid reaches the indicator, Since it is difficult to prevent the indicator from responding, the indicator can respond to the liquid accurately.
Therefore, the absorbent article is excellent in the temporary storage property of the liquid and the indicator property of the indicator.

[Aspect 2]
The intermediate layer is composed of an intermediate sheet that is folded in the thickness direction at a predetermined folding axis, and the intermediate layer is an overlapping portion in which the intermediate sheet overlaps in the thickness direction. The absorbent article according to Aspect 1, 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 article, since the high basis weight region of the intermediate layer is composed of the overlapping portion and the folding axis, when the absorbent article absorbs the liquid, the overlapping portion forming the high basis weight region is folded. Since the liquid can be spread in the thickness direction with the axis as the base point, the liquid can be stored more temporarily, and the absorbent article has excellent temporary storage properties.

[Aspect 3]
The absorbent article according to aspect 1 or 2, wherein the intermediate layer is disposed between the liquid-permeable sheet and the absorber.

In the absorbent article, since the intermediate layer is disposed between the liquid-permeable sheet and the absorber, when the liquid is transferred from the liquid-permeable sheet to the absorber, the intermediate layer quickly removes the liquid. Since the absorbent article can be temporarily stored in, the absorbent article is excellent in the temporary storage property of liquid.

[Aspect 4]
The absorbent article according to aspect 3, wherein the indicator is arranged between the intermediate layer and the absorber.

In the absorbent article, since the indicator is arranged between the intermediate layer and the absorber, the indicator itself can be kept away from the wearer by sandwiching the intermediate layer therebetween. In addition, the low basis weight region of the intermediate layer can easily permeate the liquid, and the liquid can reach the indicator quickly, and the low basis weight region of the intermediate layer causes the response of the indicator from the inner surface of the absorbent article. It is difficult to hinder the visibility of. Therefore, the absorbent article is excellent in the indicator property of the indicator to the inner surface of the absorbent article.

[Aspect 5]
The absorbent article according to any one of aspects 1 to 4, wherein the intermediate layer is arranged between the absorber and the liquid impermeable sheet.

In the absorbent article, since the intermediate layer is arranged between the absorber and the liquid-impermeable sheet, the intermediate layer can temporarily store the liquid and diffuse the liquid in the planar direction. ..

[Aspect 6]
The absorbent article according to aspect 5, wherein the indicator is arranged between the intermediate layer and the liquid impermeable sheet.

In the absorbent article, since the indicator is arranged between the intermediate layer and the liquid impermeable sheet, the low grammage region of the intermediate layer allows the liquid to easily pass therethrough, and the liquid quickly reaches the indicator. Therefore, the response of the indicator is not easily disturbed by the low basis weight region of the intermediate layer, and the visibility of the indicator from the outer surface of the absorbent article is excellent.

[Aspect 7]
The absorbent article according to aspect 1 or 2, wherein the absorbent body includes an absorbent core and a core wrap, and the intermediate layer is disposed inside the core wrap.

In the absorbent article, since the intermediate layer is disposed inside the core wrap, even when body pressure or the like is applied to the absorbent article, the liquid temporarily stored in the intermediate layer, It will not leak to the outside and will be easier to transfer to the absorbent core.

[Aspect 8]
The absorbent article according to aspect 7, wherein the absorbent core includes two absorbent core portions stacked in the thickness direction, and the intermediate layer is disposed between the two absorbent core portions. ..

In the absorbent article, since the intermediate layer is disposed between the two absorbent core portions that form the absorbent core, the intermediate layer does not leak the temporarily stored liquid to the outside of the absorbent article. It is possible to make the transition depending on the requirements of two absorbent core portions adjacent to each other in the thickness direction. Therefore, the absorbent article is excellent in temporary storage of liquid.

[Aspect 9]
The absorbent article has a longitudinal direction and a width direction forming the plane direction,
The absorbent body, which extends in the longitudinal direction, includes a pair of channels spaced in the width direction,
The intermediate layer is composed of an intermediate sheet in which both ends in the width direction are folded by a pair of folding shafts extending along the longitudinal direction, and the low tsubo located at the center in the width direction. A weight region and the high basis weight regions arranged at both ends in the width direction,
The high basis weight region is arranged so as to overlap with each of the pair of channels in the thickness direction, and the low basis weight region is arranged between the pair of channels in the plane direction. ing,
The absorbent article according to any one of aspects 1 to 8.

When the absorber has a predetermined channel, when the wearer wears the absorbent article, the absorber, and thus the absorbent article, are easily deformed and guided along the channel.
On the other hand, the channel tends to easily diffuse the liquid reaching the absorber in the longitudinal direction along the channel, so that the liquid may be difficult to reach the indicator.
In the absorbent article, the high basis weight region of the intermediate layer is arranged so as to overlap with each of the pair of channels in the thickness direction, so that the high basis weight region of the intermediate layer holds the liquid, While suppressing and diffusing the liquid in the longitudinal direction of the absorber through the channels, the low basis weight region of the intermediate layer disposed between the pair of channels allows the liquid to permeate and reach the indicator. As such, the indicator can respond quickly to liquids. Therefore, the absorbent article is excellent in the deformation inducibility and the indicator property of the indicator.

[Aspect 10]
The absorbent article has a longitudinal direction and a width direction forming the plane direction,
The absorbent body extends in the longitudinal direction and includes a pair of channels spaced in the width direction,
The intermediate layer is composed of an intermediate sheet in which both ends in the width direction are folded by a pair of folding shafts extending along the longitudinal direction, and the low tsubo located at the center in the width direction. A weight region and the high basis weight regions arranged at both ends in the width direction,
The low basis weight region is disposed so as to overlap with at least one of the pair of channels in the thickness direction, and the low basis weight region is disposed between the pair of channels in the plane direction. Has been
The absorbent article according to any one of aspects 1 to 8.

When the absorber has a predetermined channel, when the wearer wears the absorbent article, the absorber, and thus the absorbent article, are easily deformed and guided along the channel.
On the other hand, the channels tend to facilitate the liquid reaching the absorber to diffuse longitudinally along the channels.
In the absorbent article, since the low basis weight region of the intermediate layer is arranged so as to overlap with at least one of the pair of channels in the thickness direction, the low basis weight region of the intermediate layer uses the liquid as a channel. The liquid can then be transferred and then diffused through the channels in the longitudinal direction of the absorber. The indicator is arranged in the low basis weight region of the intermediate layer, that is, on one of the pair of channels and between the pair of channels, so that the liquid diffused by the channels in the longitudinal direction reaches the indicator. As such, the indicator can respond quickly to liquids. Therefore, the absorbent article is excellent in the deformation inducibility and the indicator property of the indicator. The above effect is exerted when the indicator is arranged in a region other than the crotch region of the absorbent article, for example, the indicator is arranged in the longitudinal direction from the crotch region of the absorbent article beyond the crotch region.

[Aspect 11]
11. The absorbent article according to aspect 9 or 10, wherein in the intermediate layer, the intermediate sheet is folded toward the liquid-impermeable sheet side by the pair of folding axes.

In the absorbent article, since the intermediate sheet constituting the intermediate layer is folded toward the liquid-impermeable sheet side, the intermediate layer, between the sheet member adjacent to the liquid-permeable sheet side, and the intermediate layer. Voids are unlikely to occur. Therefore, in the absorbent article, the intermediate layer easily receives the liquid reaching the liquid-permeable sheet from the sheet member.

The absorbent article of the present disclosure will be described in detail below.
1 to 5 are diagrams for explaining 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. 1. FIG. 4 is a cross-sectional view of the absorber 14 taken along the line III-III in FIG. 1. 5: is a figure for demonstrating the absorber 14, FIG.5(a) is a top view, FIG.5(b) is sectional drawing along the Vb-Vb line in FIG.5(a). 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 depicted to be thicker than the actual thickness.

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 respectively inward and inward in the width direction W, and the direction and the side away are respectively outward and outward in the width direction W. 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 defined as the outward direction and the outer side in the longitudinal direction L, respectively.

In addition, the side in the longitudinal direction L toward the edge (abdominal edge) of the pants-type diaper 1 corresponding to the wearer's abdomen is also referred to as the front side in the longitudinal direction L and corresponds to the wearer's back. The side toward the edge of 1 (edge on the back side) is also referred to as the rear side of the longitudinal direction L.
The “plan view” refers to viewing the pants-type diaper 1 in a state of being developed on a plane including the longitudinal direction L and the width direction W from the upper side 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 closer to the wearer's skin surface and a side 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 absorbent body 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 a "member or the like") is along the longitudinal direction L is not limited to a case where the member or the like is parallel to the longitudinal direction L, but a 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 along the width direction W is 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 which are 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 portion 2 is a portion 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 in the width direction W of the abdominal part 2 and both ends 3a, 3a in the width direction W of the back part 3 are joined along the longitudinal direction L, respectively, so that a pants-type diaper 1 is formed. In the pants-type diaper 1, the outer end 2e of the abdominal part 2 in the longitudinal direction L and the outer end 3e of the back side 3 in the longitudinal direction L define a waist opening through which the wearer's waist passes. .. Further, in the pants-type diaper 1, a 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 folding positions on the abdominal side portion 2 and the back side portion 3 respectively configure the end portion 2e of the abdominal side portion 2 and the end portion 3e of the back side portion 3.

In the first embodiment, the ventral side portion 2 and the back side portion 3 respectively include a plurality of elastic members 6a, 6b for waist gather and a plurality of elastic members 7a, 7b between the cover sheet 5a and the cover sheet 5b. 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 in the respective predetermined regions on both sides of the center line CL in the longitudinal direction so as to be spaced from each other in the longitudinal direction L. The predetermined region is a region from the end portion 2a to a portion inside the opposite edge of the absorbent main body 10 in the width direction W. 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 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 3a to a portion inside the opposite edge of the absorbent main body 10 in the width direction W. The plurality of elastic members 7b extend from one end 3a to the other end 3a in 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 includes 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 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 for absorbing and holding a 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 together by an adhesive, and the liquid-permeable sheet 12 and the liquid-impermeable sheet 13 are bonded by 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 side is an outward convex curve, 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, and is adjacent to the fixing regions 15 and 15 in the width direction W on the skin side surface of the absorbent main body 10. 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 of the absorbent main body 10 on the skin side in the width direction W 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 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 leak preventive 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 is formed of a sheet having liquid permeability, and includes a water-absorbing 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 a water retention property and a 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 outward. 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, so that 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, the first base material 44, the intermediate layer 43, and the second base material 46 are laminated and joined in the thickness direction T at both ends in the longitudinal direction L of the absorber 14. Thereby, 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, 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. The intermediate sheet 43S includes two folding shafts 103 and 104, and in the expanded state, the two folding shafts 103 and the first sheet portion 43a disposed inside the folding shafts 104 and the two folding shafts 103. 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 toward the thickness direction T, specifically, the second absorbent 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 are 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, 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, the first sheet portion 43a and the second sheet portion 43b are joined by the embossed portions 43c extending along the longitudinal direction L in each of the pair of high basis weight regions HB (the pair of overlapping portions OP). Has been done.

In the intermediate layer 43, the fiber density of the composite fiber in the pair of embossed portions 43c is higher than the fiber density of the composite 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 the pair of embossed portions 43c and three low fiber density portions LD configured by the portions 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, where the liquid reaching the first absorbent layer 41 tends to stay around the first water absorbent material 45 of the first absorbent layer 41, the liquid 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.

In addition, 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 regions 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) that was 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. 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. Are easily delivered 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 retainability 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 formed 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 temporarily store the liquid.

The pair of high fiber density portions HD is composed of an embossed portion 43c that embosses the one sheet portion 43a and 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 intermediate 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 there. 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 absorbing 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 so 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. As a result, 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.

In the pants-type diaper 1, the indicator 101 is arranged between the absorber 14 and the liquid impermeable sheet 13. The indicator 101 functions to inform the user (for example, a mother) that the pants-type diaper 1 has absorbed a liquid (for example, urine) on the outer surface of the pants-type diaper 1.
The indicator 101 is arranged from the low basis weight region LB (non-overlapping portion NP) of the intermediate layer 43 to the pair of high basis weight regions HB (pair of overlapping portions OP). Further, the indicator 101 is arranged between the pair of channels 48, 48.

The first water-absorbing material 45 and the second water-absorbing material 47 include a super absorbent 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 , 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 equivalent. 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 have 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 the 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 superabsorbent 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 for example, may be 3 to 50 g/m ² for each layer. However, each layer is an adhesive layer between the first water absorbent material 45 and the first base material 44, an adhesive layer between the first water absorbent material 45 and the intermediate layer 43, and a second water absorbent material 47 and the second water absorbent material 47. It means an adhesive layer between the second base material 46 and an 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 liquid-permeable nonwoven fabrics containing synthetic fibers, hydrophilic nonwoven fabrics, and laminated nonwoven fabrics thereof. Among them, nonwoven fabrics having high water permeability are 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 the 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, and 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 layers of one or a plurality of non-woven fabrics described above.
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 fibers such as polyamide fibers, regenerated fibers such as rayon fibers, acetate fibers, natural fibers such as cotton, silk, hemp, pulp (cellulose) fibers, 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 spunlace 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 region BA, an abdominal side region FA, and a crotch region 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 side region BA and the abdominal region FA in 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 back side region BA overlapping with the back side part 3, a belly side region FA overlapping with the belly side 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 grammage region 14a is a region where the grammage of the superabsorbent 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 superabsorbent 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 SAP non-arrangement area BAc is provided as the non-arrangement area 14c. In the absorbent body 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 equal to the basis weight of the super absorbent polymer in the crotch region MA. In addition, "equal" means that one is in the range of 0.7 to 1.3 times (±30%) of the other.

The second absorbent layer 42 includes, at a rear end in the longitudinal direction L, a protrusion that protrudes 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 therefore, 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 basis weight area BAb is relatively lengthened to suppress the basis weight of the superabsorbent polymer as a whole to a rear side portion in the longitudinal direction L. A super absorbent polymer is arranged. Although the amount is small, it is possible to easily suppress the transmission 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-arranged area FAc is dc1, da1>dc1. That is, in the abdominal region FA, the length of the abdominal SAP high basis weight region FAa is relatively increased to increase the basis weight of the superabsorbent polymer as a whole to the front end in the longitudinal direction L. A super absorbent polymer is arranged. As a result, it is possible to facilitate accurate absorption of 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 abdominal SAP non-disposing area FAc is made relatively long by controlling the length of the dorsal SAP non-disposing area BAc to be low while suppressing the usage amount of the superabsorbent polymer in the back area BA having a small excretion amount. Can be made relatively short so that the liquid in the abdominal region FA, which has a large excretion amount, can be easily absorbed accurately.

In addition, 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 back side region BA in the longitudinal direction L 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. Next, the super absorbent polymer is supplied from the super absorbent polymer supply device along the longitudinal direction L onto 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 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 having the both surfaces coated with the hot melt adhesive 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. Then, 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 on the super absorbent polymer side. Then, both side portions of the sheet for the second base material 46 in the width direction W are folded back onto both side portions 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, to obtain the absorber 14.

Next, a method of 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 of the absorbent body 14 (the surface of the second base material 46). 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 in the width direction W of the laminate 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 both ends 2a, 2a of the abdominal side portion 2 in the width direction W and the width direction W of the back side portion 3 are separated. The both ends 3a, 3a are joined. Thereby, the pants-type diaper 1 is manufactured.

FIG. 6 is a diagram for explaining a pants-type diaper (not shown) according to another embodiment of the present disclosure (hereinafter, referred to as “second embodiment”), and corresponds to FIG. FIG.
The pants-type diaper according to the second embodiment differs from the pants-type diaper 1 according to the first embodiment in the following points.
(I) In the intermediate layer 43, the first sheet portion 43a and the second sheet portion 43b are not joined by an embossed portion extending along the longitudinal direction L. (ii) A pair of channels of the second absorbent layer 42 48, 48 are arranged so as to overlap the low basis weight region LB (non-overlapping portion NP) of the intermediate layer 43 in the thickness direction T, not the pair of high basis weight regions HB (a pair of overlapping portions OP). Except for the points other than the above, the pants-type diaper according to the second embodiment is the same as the pants-type diaper 1 according to the first embodiment, and a description thereof will be omitted.

In the pants-type diaper 1 according to the second embodiment, since the low basis weight region LB of the intermediate layer 43 is arranged so as to overlap with both of the pair of channels 48, 48 in the thickness direction T, the intermediate layer 43. The low basis weight region LB of the liquid can transfer the liquid to the pair of channels 48, 48 and then diffuse the liquid in the longitudinal direction L through the pair of channels 48, 48. Since the indicator 101 is arranged in the low grammage region LB of the intermediate layer 43, that is, the pair of channels 48, 48 and between them, the liquid diffused in the longitudinal direction L by the pair of channels 48, 48 is used as an indicator. Since 101 can be reached, the indicator 101 can respond quickly to liquids.

The absorbent article of the present disclosure is not particularly limited as long as it contains a superabsorbent polymer, and examples thereof include disposable diapers, incontinence pads, disposable shorts, sanitary napkins, shorts-type sanitary napkins, panty liners, and postpartum pads. , Breast milk pads, hemorrhoid pads, sweat removal pads, pressure ulcer sheets (dressing sheets), diapers for pets, sheets for pets, and the like.

In the absorbent article of the present disclosure, those known in the art can be used without particular limitation, and for example, the wetness indicator described in Patent Document 1 such as a pH indicator or a water-soluble dye can be used. Examples of the composition include:

The above-mentioned indicator can be arranged at any position in the thickness direction of the absorbent article, and its place is not essentially limited.
From the viewpoint of the effect of the present disclosure, in the case where the indicator is arranged so as to indicate on the outer surface of the absorbent article, for example, the indicator is provided between (i) the absorber and the liquid impermeable sheet. For example, between the liquid-impermeable sheet-side core wrap forming the absorber and the liquid-impermeable sheet, (ii) the inside of the absorber, for example, the absorbing core forming the absorber, and the liquid-impermeable For example, when the indicator is arranged so as to indicate on the inner surface of the absorbent article, (i) between the absorbent body and the liquid-permeable sheet, For example, between the liquid-permeable sheet-side core wrap that constitutes the absorber and the liquid-permeable sheets, (ii) inside the absorber, for example, the absorbent core that constitutes the absorber and the liquid-permeable sheet-side core wrap. And the like.
From the viewpoint of the effect of the present disclosure, it is preferable that the indicator is arranged on the side farther from the liquid permeable sheet (the liquid impermeable sheet side) where the liquid first reaches than the intermediate layer.

In the absorbent article of the present disclosure, the indicator may be arranged at any position in the plane direction of the absorbent article. In order for the indicator to respond quickly, it is preferable that the indicator is arranged at least in the excretory opening contact area, the crotch area, or the like that contacts the excretory opening of the wearer, and the excretory opening contact area, the crotch area, or the like. Therefore, it can be arranged along the longitudinal direction of the absorbent article. The excretory opening contact area is generally arranged in the center of the absorbent article in the width direction.

In the absorbent article according to an embodiment of the present disclosure, the intermediate layer includes 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. It is preferable that the low grammage region and the low grammage region each include an overlapping portion and a non-overlapping portion of the intermediate sheet folded in the thickness direction of the absorbent article at a predetermined folding axis. Accordingly, when the absorbent article absorbs 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, and thus the liquid can be stored more temporarily.

In the absorbent article of the present disclosure, the intermediate sheet forming the intermediate layer is preferably folded toward the liquid-impermeable sheet. 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 absorbent article of the present disclosure, the intermediate layer may be arranged at any position in the thickness direction of the absorbent article. The intermediate layer is, for example, (i) between the liquid-permeable sheet and the absorber, (ii) between the absorber and the liquid-impermeable sheet, (iii) inside the absorber, for example, core wrap and It may be arranged inside the core wrap of the absorbent body including the absorbent core, between the two absorbent core portions constituting the absorbent core, or the like.
As described above, from the viewpoint of the effect of the present disclosure, the intermediate layer is arranged closer to the liquid permeable sheet that the liquid reaches first than the indicator (the liquid permeable sheet side). Preferably.

The intermediate layer (i) is arranged between the liquid permeable sheet and the absorbent body so that the intermediate sheet can temporarily hold the liquid when the liquid is transferred from the liquid permeable sheet to the absorbent body. Can be stored.

When the intermediate layer is arranged between (i) the liquid-permeable sheet and the absorbent body, and the indicator is arranged so as to indicate the inner surface of the absorbent article, the indicator is: For example, it may be arranged between (ii) the liquid permeable sheet and the intermediate layer, (i-ii) between the intermediate layer and the absorber, (i-iii) inside the absorber, and the like. When the indicator is arranged between the (ii) liquid permeable sheet and the intermediate layer, the visibility of the indicator is improved. When the indicator is arranged between the (i-ii) intermediate layer and the absorber, or (i-iii) inside the absorber, the indicator itself is kept away from the wearer by sandwiching the intermediate layer between them. be able to. In addition, the low basis weight region of the intermediate layer does not retain the liquid, easily permeates the liquid, and allows the liquid to reach the indicator quickly, and the low basis weight region of the intermediate layer of the responding indicator, The visibility from the inner surface of the absorbent article is less likely to be impaired.

Further, in the case where the intermediate layer is arranged between (i) the liquid-permeable sheet and the absorbent body and the indicator is arranged so as to indicate to the outer surface of the absorbent article, Can be disposed, for example, inside the (i-iii) absorber, between the (i-iv) absorber and the liquid impermeable sheet, or the like. When the above-mentioned indicator is arranged inside (i-iii) absorber or between (i-iv) absorber and liquid impermeable sheet, the low basis weight region of the intermediate layer retains liquid. Without doing so, the liquid can easily pass through, and the liquid can quickly reach the indicator.

In the case where the intermediate layer is arranged between (ii) the absorber and the liquid impermeable sheet, and the indicator is arranged so as to indicate to the inner surface of the absorbent article, the indicator is For example, it may be arranged between (ii-i) the liquid permeable sheet and the intermediate layer, (ii-ii) between the intermediate layer and the absorber, (ii-iii) between the absorbers, and the like. In either case, the low basis weight region of the intermediate layer is unlikely to draw in the liquid, and the response of the indicator is unlikely to be disturbed by the low basis weight region of the intermediate sheet.

When the intermediate layer is arranged between (ii) the absorbent body and the liquid impermeable sheet, and the indicator is arranged so as to indicate to the outer surface of the absorbent article, the indicator is , (Ii-iii) absorbers, (ii-iv) absorbers and intermediate layers, (ii-v) intermediate layers and liquid-impermeable sheets, and the like. When the indicator is arranged between the (ii-iii) absorber or between the (ii-iv) absorber and the intermediate layer, the response of the indicator is less likely to be hindered by the low basis weight region of the intermediate sheet. And, the low grammage region of the intermediate layer does not easily hinder the visibility of the responded indicator from the outer surface of the absorbent article. Even when the indicator is arranged between the (ii-v) intermediate layer and the liquid-impermeable sheet, the response of the indicator is not easily disturbed by the low basis weight region of the intermediate sheet, and the absorbent article of the indicator Excellent visibility from the outside.

When the intermediate layer is disposed in (iii) the inside of the absorbent body, particularly between the two absorbent core portions constituting the absorbent core, the indicator is adapted to indicate to the inner surface or the outer surface of the absorbent article. It can be arranged and is preferably arranged so as to indicate to the outer surface of the absorbent article.

In the case where the intermediate layer is (iii) arranged inside the absorber, the indicator is arranged so as to indicate to the inner surface of the absorbent article (for example, the indicator is a liquid permeable sheet and When disposed between the absorbers), the low basis weight region of the intermediate sheet is less likely to draw in liquid and the response of the indicator is less likely to be impeded by the low basis weight region of the intermediate sheet.

In the case where the intermediate layer is arranged inside (iii) the absorbent body, the indicator is arranged so as to indicate to the outer surface of the absorbent article (for example, the indicator is arranged in the absorbent body and liquid When it is arranged between the permeable sheets), the low basis weight region of the intermediate layer allows the liquid to easily pass therethrough and allows the liquid to reach the indicator quickly, while the low basis weight region of the intermediate layer is The visibility of the responsive indicator from the inner surface of the absorbent article is less likely to be impaired.

The absorbent body according to the absorbent article of the present disclosure, particularly the absorbent core, contains a superabsorbent 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 superabsorbent 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, Super Absorbent Polymer) and the like, and polyacrylate-based (particularly sodium polyacrylate-based) superabsorbent polymers are preferred. ..

In the absorbent article of the present disclosure, the absorbent body, particularly the absorbent core, is not particularly limited as long as it is mainly composed of a superabsorbent polymer, and may contain hydrophilic fibers such as pulp fibers. The absorbent body can have any structure and may include one absorbent core or two or more absorbent cores. Further, the absorber may include the above-mentioned intermediate layer.
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 absorber is, for example, 0.5 to 20 mm, and preferably 1 to 10 mm.

In the absorbent article of the present disclosure, the absorber may include channels. 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 channel extends 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.

The pair of channels, in plan view, for example, the spacing of the pair of channels may be arranged so as to be constant along the longitudinal direction of the absorbent article, and the spacing of the pair of channels, for example, The absorbent article may be arranged so as to be narrow in the vicinity of the center in the longitudinal direction and expand toward both outer sides in the longitudinal direction.

The pair of channels may be arranged so as to overlap the high basis weight region of the intermediate layer in the thickness direction of the absorbent article. Also, the low basis weight region of the intermediate layer may be disposed between the pair of channels. As a result, the high basis weight region of the intermediate sheet holds the liquid, suppresses the liquid from diffusing in the longitudinal direction of the absorber through the channels, and suppresses the low basis weight of the intermediate sheet arranged between the pair of channels. The indicator is able to respond quickly to the liquid because the volume region allows the liquid to pass through and allows the liquid to reach the indicator.

The channels can be arranged so as to overlap the low basis weight region of the intermediate layer in the thickness direction of the absorbent article. Also, the low basis weight region of the intermediate layer can be disposed between the pair of channels. Thereby, the low basis weight regions of the intermediate sheet can transfer the liquid to the channels and then diffuse the liquid through the channels in the longitudinal direction of the absorber. The indicator is arranged in the low basis weight region of the intermediate sheet, that is, on one of the pair of channels and between the pair of channels, so that the liquid diffused by the channels can reach the indicator. , The indicator can respond quickly to the liquid.

In the absorbent article of the present disclosure, the channel means a region in the absorbent body where the basis weight of the absorbent core is smaller than that of the surrounding region. The channel has a basis weight of preferably 70% by weight or less, more preferably 50% by weight or less, and even more preferably 30% by weight or less, and 0% by weight of tsubos, compared to the surrounding region in the absorbent core. It may have an amount. This is from the viewpoint of using the channel as the starting point of change guidance.
When the absorber includes a plurality of absorbent cores, the basis weight of the channel means the basis weight of each absorbent core.
Further, when the absorbent body includes a plurality of absorbent cores, each of the plurality of absorbent cores may or may not have the channel.

1 Pants-type diaper 2 Ventral region (ventral waist belt)
3 Dorsal part (dorsal waist belt)
4 Crotch part 5, 5a, 5b Cover sheet 6a, 6b, 7a, 7b Elastic member 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 absorbing material 46 Second base material 47 Second water absorbing material 48 Channel 101 Indicator 103, 104 Folding axis L Longitudinal direction W width Direction T Thickness direction CL Longitudinal centerline CW Width centerline 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 (11)

A liquid-permeable sheet, a liquid-impermeable sheet, and an absorbent body and an intermediate layer, which are arranged between them, and which include a superabsorbent polymer, and have a thickness direction and a plane direction. An article,
The intermediate layer includes 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,
The absorbent article further comprises an indicator arranged so as to overlap the low basis weight region in the thickness direction.
The absorbent article as described above. The intermediate layer is composed of an intermediate sheet that is folded in the thickness direction at a predetermined folding axis, and the intermediate layer is an overlapping portion in which the intermediate sheet overlaps in the thickness direction. The absorbent article according to claim 1, wherein the intermediate sheet is partitioned into non-overlapping portions that do not overlap in the thickness direction, and the high basis weight region is formed of the overlapping portions. The absorbent article according to claim 1 or 2, wherein the intermediate layer is disposed between the liquid-permeable sheet and the absorbent body. The absorbent article according to claim 3, wherein the indicator is arranged between the intermediate layer and the absorbent body. The absorbent article according to any one of claims 1 to 4, wherein the intermediate layer is arranged between the absorber and the liquid-impermeable sheet. The absorbent article according to claim 5, wherein the indicator is arranged between the intermediate layer and the liquid-impermeable sheet. The absorbent article according to claim 1, wherein the absorbent body includes an absorbent core and a core wrap, and the intermediate layer is disposed inside the core wrap. The absorbent core according to claim 7, wherein the absorbent core comprises two absorbent core portions stacked in the thickness direction, and the intermediate layer is disposed between the two absorbent core portions. Goods. The absorbent article has a longitudinal direction and a width direction that constitute the plane direction,
The absorber has a pair of channels extending in the longitudinal direction and spaced in the width direction,
The intermediate layer is composed of an intermediate sheet in which both ends in the width direction are folded by a pair of folding shafts extending along the longitudinal direction, and the low-square base arranged in the center in the width direction. A weight region and the high basis weight regions arranged at both ends in the width direction,
The high basis weight region is arranged so as to overlap with each of the pair of channels in the thickness direction, and the low basis weight region is arranged between the pair of channels in the plane direction. ing,
The absorbent article according to any one of claims 1 to 8. The absorbent article has a longitudinal direction and a width direction forming the plane direction,
The absorber has a pair of channels extending in the longitudinal direction and spaced in the width direction,
The intermediate layer is composed of an intermediate sheet in which both ends in the width direction are folded by a pair of folding shafts extending in the longitudinal direction, and the low-square base arranged in the center in the width direction. And a high-basis-weight region arranged at both ends in the width direction,
The low basis weight region is disposed so as to overlap with at least one of the pair of channels in the thickness direction, and the low basis weight region is disposed between the pair of channels in the plane direction. Has been
The absorbent article according to any one of claims 1 to 8. The absorbent article according to claim 9 or 10, wherein in the intermediate layer, the intermediate sheet is folded toward the liquid-impermeable sheet side by the pair of folding axes.

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