JP2020108745A - Absorbent article - Google Patents

Abstract

To provide an absorbent article excellent in repetitive absorbency.SOLUTION: An absorbent article 1 is provided with a liquid-permeable sheet 12, a liquid-impermeable sheet 13 and an absorber 14, and the absorber 14 is provided with a middle layer 43 and an absorber layer 41 including highly water-absorbing polymers in a thickness direction T. The absorber 14 is divided into a width direction central area WC including a longitudinal direction central line CL and a pair of width direction adjacent areas WA adjacent to the width direction central area WC in the width direction W. The middle layer 43 is provided with a first sheet part 43a away from the absorber layer 41 and a second sheet part 43b close to the absorber layer 41. The first sheet part 43a is in contact with the absorber layer 41 in the width direction central area WC and is not joined to members present on the liquid impermeable sheet 13 side of the first sheet part 43a in the pair of width direction adjacent areas WA, whereas the second sheet part 43b is in contact with the absorber layer 41 in the pair of width direction adjacent areas WA.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to absorbent articles.

There is known an absorbent article including an absorber including a first absorbent layer containing a super absorbent polymer, a second absorbent layer containing a super absorbent polymer, and a fabric layer arranged therebetween. ..
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 bonded and laminated with an adhesive, water sheet: (1) the basis weight of the base layer is 25 g / m ² or more, and (2) between the substrates having a vent temper with adhesive in an amount of 0.1 to 50 g / m ² It is described that they are bonded.

International Publication No. 2010/143635

In the water-absorbent sheet (absorbent body) described in Patent Document 1, the base layer is formed on the water-absorbent sheet (absorbent body) due to the fact that (i) the water-absorbent resin (superabsorbent polymer) has a poor liquid absorption rate. Due to the function of temporarily storing the reached liquid and (ii) the ease of blocking by the water absorbent resin (super absorbent polymer), the absorbency of the water absorbent sheet (absorbent body) and eventually the absorbent article containing it is reduced. It has the function of suppressing this.

On the other hand, the water-absorbent sheet (absorbent body) described in Patent Document 1 tends to have difficulty in securing a space in which the water-absorbent resin (superabsorbent polymer) expands when the liquid is repeatedly absorbed, and has a repeated absorbability. It tended to be inferior.
Therefore, an object of the present disclosure is to provide an absorbent article having excellent repeated absorbability.

The present disclosure is an absorbent article that includes a liquid-permeable sheet, a liquid-impermeable sheet, and an absorber between them, and is an absorbent article having a longitudinal direction, a width direction, and a thickness direction, wherein: The absorbent body, in the thickness direction, comprises an intermediate layer and an absorbent layer containing a superabsorbent polymer, the absorbent body, in the width direction, a width including a longitudinal centerline of the absorbent article. Direction central region and a pair of widthwise adjacent regions that are adjacent to the widthwise central region, and the intermediate layer is a first sheet portion that is far from the absorbent layer, and a second sheet portion that is close to the absorbent layer. And the first sheet portion is in contact with the absorbent layer in the widthwise central region, and in the pair of widthwise adjacent regions, on the liquid impermeable sheet side of the first sheet portion. The present invention has found an absorbent article characterized in that the second sheet portion is not connected to existing members and is in contact with the absorbent layer in the pair of widthwise adjacent regions.

The absorbent article of the present disclosure has excellent repeated absorbability.

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 absorber 14. FIG. 7 is a diagram for explaining the absorber 14. FIG. 8 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 article between them, a longitudinal direction, an absorbent article having a width direction and a thickness direction,
The absorbent body, in the thickness direction, comprises an intermediate layer and an absorbent layer containing a superabsorbent polymer,
The absorbent body, in the widthwise direction, is divided into a widthwise central region including a longitudinal centerline of the absorbent article, and a pair of widthwise adjacent regions adjacent to the widthwise central region,
The intermediate layer comprises a first sheet portion far from the absorbent layer and a second sheet portion near the absorbent layer,
The first sheet portion is in contact with the absorbent layer in the widthwise central region, and is connected to the member existing on the liquid impermeable sheet side of the first sheet portion in the pair of widthwise adjacent regions. Not
The second sheet portion is in contact with the absorption layer in the pair of widthwise adjacent regions,
The absorbent article described above.

In the absorbent article, the first sheet portion is in contact with the absorbent layer in the central region in the width direction, and in a pair of adjacent regions in the width direction, a member existing on the liquid impermeable sheet side of the first sheet part. Since the second sheet portion is not connected and is in contact with the absorbent layer in the pair of widthwise adjacent regions, a portion corresponding to the widthwise central region of the absorbent layer (hereinafter, referred to as "widthwise central portion"). ) Absorbs the liquid and the central portion in the width direction of the absorbent layer bulges in the thickness direction, the first sheet portion bulges accordingly, and the first sheet portion and the second sheet portion are separated from each other. Voids can be formed between them.

Then, the absorbent article repeatedly absorbs the liquid, the intermediate layer, while temporarily storing the liquid, the liquid is diffused from the widthwise central region to the pair of widthwise adjacent regions, and in the absorbing layer, on demand. When the liquid is supplied, when the portions corresponding to the pair of widthwise adjacent regions of the absorption layer (hereinafter, referred to as “widthwise adjacent portions”) absorb the liquid and expand, the liquid may expand toward the gap. Therefore, the absorbent article is less likely to impair the liquid absorbency. From the above, the absorbent article has excellent repeated absorbability.

[Aspect 2]
The absorbent article according to aspect 1, wherein the first sheet portion and the second sheet portion are formed of an integral intermediate sheet that is folded in the thickness direction at a predetermined folding axis.

In the absorbent article, since the first sheet portion and the second sheet portion are formed of a predetermined integral intermediate sheet, the voids are easily formed by the restoring force of the integral intermediate sheet on the folding shaft. Therefore, the absorbent article is excellent in repeated absorbability.

[Aspect 3]
The intermediate layer is formed of an integral intermediate sheet that extends in the longitudinal direction and is folded in the thickness direction at two folding axes that are separated from each other, and the first sheet portion is Aspect 1 or 2, wherein the second intermediate portion is disposed inside the two folding axes of the integral intermediate sheet, and the second sheet portion is disposed outside of the two folding axes of the integral intermediate sheet. Absorbent article.

In the absorbent article, since the first sheet portion and the second sheet portion are formed of a predetermined integral intermediate sheet, the voids are easily formed by the restoring force of the integral intermediate sheet at the two folding axes. Become. Further, when the absorbent article is applied with a force to narrow the absorbent article in the width direction due to the thighs of the wearer when the absorbent article is worn, the two folding axes are also given a force to narrow the absorbent article in the width direction, and the gap It is easily formed. Therefore, the absorbent article is excellent in repeated absorbability.

[Aspect 4]
Each of the intermediate layer and the adjacent sheet adjacent to the liquid permeable sheet side of the first sheet portion includes a fiber, and the fiber diameter of the fibers forming the first sheet portion forms the adjacent sheet. The absorbent article according to any one of aspects 1 to 3, which is larger than the fiber diameter of the fibers.

In the absorbent article, since the fiber diameter of the fiber forming the first sheet portion is larger than the fiber diameter of the fiber forming the adjacent sheet, the restoring force of the integral intermediate sheet at the folding axis (two folding axes) is increased. It becomes larger, the voids are easily formed, and the absorbent article is excellent in repeated absorbability.

[Aspect 5]
The intermediate layer is disposed on the liquid permeable sheet side of the absorbent layer, the absorber is the intermediate layer, the liquid permeable sheet side, an additional absorbent layer containing a super absorbent polymer. The absorbent article according to any one of aspects 1 to 4, further comprising:

In the absorbent article, since the absorbent body includes the two absorbent layers (the absorbent layer and the additional absorbent layer) with the intermediate layer sandwiched therebetween, when the liquid is repeatedly absorbed, the two absorbent layers form the intermediate layer. Since it is possible to expand toward the voids formed in the layer, the absorbent article is unlikely to impair the liquid absorbency. From the above, the absorbent article has excellent repeated absorbability.

[Aspect 6]
The absorbent article according to aspect 5, wherein the absorbent layer includes a pair of channels extending in the longitudinal direction and spaced from each other in the width direction in the widthwise central region. ..

In the absorbent article, since the absorbent layer has a predetermined channel in the widthwise central portion, the liquid reaching the absorbent layer is likely to stay between the pair of channels, and the widthwise central portion of the absorbent layer is It easily rises and the above voids are easily generated. Therefore, the absorbent article is excellent in repeated absorbability.

[Aspect 7]
The absorbent article according to aspect 6, wherein an end portion of the second sheet portion overlaps with the pair of channels in the thickness direction.

In the absorbent article, the end portion of the second sheet portion overlaps the pair of channels in the thickness direction.
Since the pair of channels has a relatively smaller basis weight of the absorbent layer than the portions other than the pair of channels, when the absorbent layer absorbs liquid and rises in the thickness direction, the pair of channels themselves are It is less likely to bulge relatively in the thickness direction than the portion other than the channel.
Therefore, in the absorbent article, when the absorbent layer absorbs the liquid and rises (swells) in the thickness direction together with the first sheet portion, the second sheet portion causes the absorbent sheet to swell in the thickness direction. It is difficult to bulge, and a void is more likely to be formed between the first sheet portion and the second sheet portion. Therefore, the absorbent article is excellent in repeated absorbability.

[Aspect 8]
The absorbent article according to aspect 6 or 7, wherein the first sheet portion is in contact with the absorbent layer only between the pair of channels in the width direction.

In the absorbent article, since the first sheet portion is in contact with the absorbent layer only between the pair of channels, the first sheet portion is properly raised when the widthwise central portion of the absorbent layer is raised. A void is more likely to occur between the first sheet portion and the second sheet portion. Therefore, the absorbent article is excellent in repeated absorbability.

[Aspect 9]
The said intermediate|middle layer has the joining part which joins a 1st sheet part and a 2nd sheet part partially in the position which overlaps in the said thickness direction. Absorbent article.

In the absorbent article, since the intermediate layer has the predetermined joint portion, the absorbent body does not easily twist even after the absorbent article repeatedly absorbs the liquid.

[Aspect 10]
The absorbent article according to aspect 9, wherein the intermediate layer contains a heat-fusible fiber and the joint portion is an embossed portion.

In the absorbent article, since the joint is the embossed section, the absorbent body is unlikely to twist even after the absorbent article repeatedly absorbs the liquid.

The absorbent article of the present disclosure will be described in detail below.
1 to 7 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. 6 and 7 are diagrams for explaining the mechanism by which the absorber 14 absorbs liquid. Note that the drawings are schematic views, and in particular, in FIGS. 3 to 7, 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 widthwise direction W, the absorbent body 14 has a widthwise central region W _C including the longitudinal centerline CL of the pants-type diaper 1 and a pair of widthwise adjacent regions W _A adjacent to the widthwise central region W _C. Partitioned. It should be noted that, in the second absorbent layer 42, regions that overlap the widthwise central region W _C and the pair of widthwise adjacent regions W _A in the thickness direction T are respectively the second absorbent layer central portion 42 a and the second absorbent layer central portion 42 a. It may be referred to as the two absorption layer adjacent portion 42b.

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 (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 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. In other words, the first sheet portion 43a is arranged at a position relatively far from the second absorbent layer 42, and each of the pair of second sheet portions 43b, 43b is relatively far from the second absorbent layer 42. It is located in a position.

The first sheet portion 43a is in contact with the second absorbent layer 42 (second absorbent layer central portion 42a) in the widthwise central region W _C , and the second absorbent layer 42 is formed by a hot melt adhesive (not shown). It is connected to the (second absorption layer central portion 42a). The first sheet portion 43a is a member existing on the liquid impermeable sheet side of the first sheet portion 43a in the pair of widthwise adjacent regions W _A , specifically, the pair of second sheet portions 43b and 43b. Each of them is not connected with a hot melt adhesive.
Each of the pair of second sheet portions 43b and 43b is in contact with the second absorbent layer 42 (second absorbent layer adjacent portion 42b) in the pair of widthwise adjacent regions W _A , and the hot melt adhesive (not shown). Is connected to the second absorption layer 42 (second absorption layer adjacent portion 42b).

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 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 in 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 retainability of the super absorbent polymer. Excellent in

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, are extended 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 arranged in the second absorbent layer 42 (second absorbent layer central portion 42a) in the widthwise central region W _C. 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 (the peripheral area in the second absorbent layer central portion 42a). Is. 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.

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.

As shown in FIG. 6, when a liquid, for example, the first urine reaches the absorber 14, the liquid passes through the first absorbent layer 41 and the intermediate layer 43 mainly in the widthwise central region W _C. When reaching the second absorbent layer 42 (second absorbent layer central portion 42a), the void 101 is formed between the first sheet portion 43a and the pair of second sheet portions 43b and 43b.

Specifically, in the first absorbent layer 41, the liquid mainly passes through the first water absorbent material 45 in the widthwise central region W _C and moves to the intermediate layer 43. The first water absorbing material 45 absorbs the remaining liquid and expands mainly in the thickness direction T.
The intermediate layer 43 has a function of temporarily storing the liquid, but in the intermediate layer 43, a low basis weight region LB (non-overlapping portion) is provided in a central portion (a portion including the longitudinal centerline CL) of the widthwise central region W _C. Since the NP) is arranged, the amount of liquid temporarily stored in the intermediate layer 43 is small (compared to the high basis weight region HB), and the liquid can be transferred to the second absorption layer 42.

In the second absorbent layer 42, since the pair of channels 48, 48 extending in the longitudinal direction L are arranged in the widthwise central region W _C (second absorbent layer central portion 42a), the second absorbent layer 42 is arranged. The liquid that has reached the position tends to stay between the pair of channels 48, 48 in the width direction and tends to diffuse in the longitudinal direction L between the pair of channels 48, 48. As a result, the second water absorbent material 47 mainly absorbs the liquid between the pair of channels 48, 48, and the second water absorbent material 47 mainly in the thickness direction T between the pair of channels 48, 48. Raise.

The first absorbent layer 41 (first water absorbent material 45) and the second absorbent layer 42 (second water absorbent material 47) are raised in the thickness direction T, so that the first water absorbent material 45 and the second water absorbent material A gap 101 is formed between the first sheet portion 43a and the first sheet portion 43a and the pair of second sheet portions 43b and 43b.

In the intermediate layer 43, the first sheet portion 43a and the pair of second sheet portions 43b, 43b are formed of an integral intermediate sheet 43S that is folded in the thickness direction T on the two folding shafts 103 and the folding shaft 10. Therefore, the void 101 is likely to be formed by the restoring force of the intermediate sheet 43S that is integral with the two folding shafts 103 and 104.

In addition, in the intermediate layer 43, the first sheet portion 43a is arranged inside the two folding shafts 103 and 104 of the intermediate sheet 43S, and the pair of second sheet portions 43b and 43b includes the intermediate sheet 43S. Are arranged outside the two folding shafts 103 and 104, that is, the two folding shafts 103 and 104 are arranged at both end edges of the intermediate layer 43 in the width direction W. When the pant-type diaper 1 is applied with a force for narrowing in the width direction W by the thigh of the wearer when the diaper 1 is worn, a force for narrowing in the width direction W is also applied to the two folding shafts 103 and 104. Therefore, the void 101 is easily formed.

In the first embodiment, the fiber diameter of the composite fiber forming the first sheet portion 43a (intermediate sheet 43S) of the intermediate layer 43 is larger than the fiber diameter of the fiber forming the liquid-permeable sheet 12. Thereby, the restoring force of the intermediate sheet 43S on the two folding shafts 103 and 104 is large, and the gap 101 is easily formed.

Next, when an additional liquid, for example, the urine after the second time, reaches the absorber 14, the intermediate layer 43 temporarily stores the liquid in the void 101 while keeping the liquid from the widthwise central region W _{C in a} pair of widths. The liquid is supplied to the first water-absorbing material 45 and the second water-absorbing material 47 as required by diffusing into the direction adjacent area W _A.

Since the voids 101 are formed in the absorber 14, the first water absorbent material 45 and the second water absorbent material 47, to which the liquid is supplied, can absorb the liquid and expand toward the void 101. As a result, the first water absorbent material 45 and the second water absorbent material 47, and thus the absorber 14 can absorb a large amount of liquid, for example, a plurality of times of urine and expand, as shown in FIG. 7.

In the thickness direction T, the ends of the pair of second sheet portions 43b and 43b (ends opposite to the two folding shafts 103 and 104) overlap with the pair of channels 48 and 48, respectively. ing. Thereby, when the second absorbent layer 42 swells in the thickness direction T, the ends of the pair of second sheet portions 43b, 43b are less likely to move in the thickness direction T, and the first sheet portion 43a, A void is more likely to be formed between the pair of second sheet portions 43b and 43b.

The first sheet portion 43a is connected to the second absorbent layer 42, specifically, the second base material 46, only between the pair of channels 48, 48 in the width direction W, specifically, the hot melt adhesion. It is glued together. As a result, when the central portion in the width direction of the second absorbent layer 42 is raised, the first sheet portion 43a is properly raised, and the first sheet portion 43a and the pair of second sheet portions 43b, 43b are provided between The void 101 is more likely to occur.

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. 8 is a diagram for explaining a pants-type diaper (not shown) according to another embodiment of the present disclosure (hereinafter, sometimes referred to as “second embodiment”), and is a diagram in the first embodiment. It is a figure corresponded to FIG.

In the pants-type diaper (not shown) according to the second embodiment, the end portions of the pair of second sheet portions 43b, 43b (the two folding shafts 103 and the end portions on the side opposite to the folding shaft 104) are the same as those of the first embodiment. Is closer to the longitudinal centerline (see FIG. 1 etc.) than the pants-type diaper 1 according to FIG.
In the pants-type diaper (not shown) according to the second embodiment, the first sheet portion 43a and the second sheet portion 43b in the pair of high basis weight regions HB (the pair of overlapping portions OP) of the intermediate layer 43. And are joined by a pair of embossed portions 43c extending along the longitudinal direction L.
The pants-type diaper (not shown) according to the second embodiment is the same as the pants-type diaper 1 according to the first embodiment in other points, and the description thereof is omitted.

In the pair of embossed portions 43c, a pants-type diaper (not shown) absorbs liquid, and a gap (see FIG. 6) is formed between the first sheet portion 43a and the pair of second sheet portions 43b, 43b. When formed, it functions to prevent the absorber 14 from twisting.

Absorbent articles of the present disclosure is not particularly limited, for example, disposable diapers, incontinence pads, disposable shorts, sanitary napkins, shorts type sanitary napkins, panty liners, postpartum pads, breast pads, hemorrhoid pads, sweat removal pads, Examples include pressure ulcer sheets (dressing sheets), diapers for pets, and sheets for pets.

In the absorbent article of the present disclosure, the absorbent body includes an intermediate layer and an absorbent layer containing a superabsorbent polymer in the thickness direction of the absorbent article, and the intermediate layer is more liquid permeable than the absorbent body. It can be arranged on the sheet side or the liquid impermeable sheet side. Since the absorbent layer tends to bulge on both the liquid-permeable sheet side and the liquid-impermeable sheet side in the thickness direction of the absorbent article, this is the case when the intermediate layer is on either side of the absorber. However, the intermediate layer can form a predetermined void.

Further, in the absorbent article of the present disclosure, the intermediate layer is arranged on the liquid permeable sheet side with respect to the absorbent layer, and the absorber is the intermediate layer, on the liquid permeable sheet side, and the highly water-absorbing polymer is used. The absorbent body may further include an additional absorbent layer that includes the absorbent body, that is, the absorbent body may include two absorbent layers (an absorbent layer and an additional absorbent layer) with the intermediate layer interposed therebetween. Thereby, the two absorbent layers can expand toward the voids formed in the intermediate layer.
In addition, in the embodiment (first embodiment and second embodiment) of the present specification, the absorption layer and the additional absorption layer are referred to as a second absorption layer and a first absorption layer, respectively.

In the absorbent article of the present disclosure, the absorbent body has a widthwise central region including a longitudinal centerline of the absorbent article and a pair of widthwise adjacent regions adjacent to the widthwise central region in the widthwise direction of the absorbent article. It is divided into and. The width center region means a region of 30% from the longitudinal centerline toward both end edges in the width direction, and each of the pair of width direction adjacent regions is from the width direction end edge of the absorber, It means an area of 20% toward the center line in the width direction. In other words, the widthwise central region occupies 60% of the region in the widthwise direction of the absorber, and each of the pair of widthwise adjacent regions has a region of 20% in the widthwise direction of the absorber (a total of 40% as the widthwise adjacent regions). %).

In the absorbent article according to the present disclosure, the intermediate layer includes a first sheet portion that is far from the absorbent layer and a second sheet portion that is close to the absorbent layer. This is from the viewpoint of forming a gap between the first sheet portion and the second sheet portion.
In the absorbent article of the present disclosure, the first sheet portion and the second sheet portion may be formed of separate intermediate sheets or an integrated intermediate sheet, and the first sheet portion and the first sheet portion The two-sheet portion is preferably composed of an integral intermediate sheet that is folded in the thickness direction of the absorbent article at a predetermined folding axis. Thereby, the voids are easily formed by the restoring force of the integral sheet on the folding shaft.

In the absorbent article according to an embodiment of the present disclosure, the intermediate layer extends in the longitudinal direction of the absorbent article and is folded in the thickness direction of the absorbent article at two folding axes that are separated from each other. The first sheet portion is arranged inside the two folding axes of the integral intermediate sheet, and the second sheet portion is arranged outside the two folding axes of the integral intermediate sheet. Preferably. As a result, the voids are easily formed by the restoring force of the integral intermediate sheet on the two folding shafts. Further, when the absorbent article is applied with a force to narrow the absorbent article in the width direction due to the thighs of the wearer when the absorbent article is worn, the two folding axes are also given a force to narrow the absorbent article in the width direction, and the gap It is easily formed.

In the absorbent article of the present disclosure, the first sheet portion is arranged at least in the widthwise central region, and is also preferably arranged in the pair of widthwise adjacent regions, and the second sheet portion is at least It is arranged in at least one of the pair of widthwise adjacent regions, and preferably in both. This is from the viewpoint of forming voids.
The second sheet portion may be arranged in the widthwise central region as long as it does not reach the longitudinal centerline.

In the absorbent article of the present disclosure, the first sheet portion is in contact with the absorbent layer (for example, the water absorbing material) in the widthwise central region, and the first sheet portion does not have the second sheet portion interposed therebetween, (For example, a water absorbing material). Further, it is preferable that the first sheet portion is connected to the absorbent layer (for example, a water absorbing material) in the widthwise central region by, for example, a hot melt adhesive, embossing, or the like. This is for forming an appropriate gap between the first sheet portion and the second sheet portion.

In the absorbent article of the present disclosure, the first sheet portion is a member existing on the liquid impermeable sheet side of the first sheet portion in the pair of widthwise adjacent regions, for example, the second sheet portion, as a whole, For example, they are not connected by a hot melt adhesive, embossing or the like. This is from the viewpoint of forming voids.

In addition, the first sheet portion is partially connected to the member existing on the liquid impermeable sheet side of the first sheet portion, for example, the second sheet portion in the pair of widthwise adjacent regions, at the joint portion. Good. This is from the viewpoint of suppressing twisting of the absorber when the absorber forms voids. The joining portion is not particularly limited, and examples thereof include a hot melt adhesive and an embossed portion, and the embossed portion is preferable. This is because it is unlikely to be affected by the liquid. In the case of the embossed portion, it is preferable that the intermediate layer contains the heat-fusible fiber and the heat-fusible fiber is fused in the embossed portion.

In the absorbent article of the present disclosure, the second sheet portion is in contact with the absorbent layer (for example, the water absorbent material) in the pair of widthwise adjacent regions, and the absorbent layer (for example, the water absorbent material), for example, the hot melt adhesive, It is preferable that they are connected by embossing or the like. This is for forming an appropriate gap between the first sheet portion and the second sheet portion.

In the absorbent article of the present disclosure, each of the intermediate layer and the adjacent sheet (for example, the liquid permeable sheet, the second sheet) adjacent to the liquid permeable sheet side of the first sheet portion can include fibers, and In this case, the fiber diameter of the fibers forming the first sheet portion may have an arbitrary relationship with the fiber diameter of the fibers forming the adjacent sheet, but the fiber diameters of the fibers forming the first sheet portion are adjacent to each other. It is preferably larger than the fiber diameter of the fibers forming the sheet. As a result, the restoring force of the integral intermediate sheet on the folding shafts (two folding shafts) becomes larger, and the voids are easily formed.

In the absorbent article of the present disclosure, each of the absorbent layer and the optional additional absorbent layer comprises 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, each of the absorbent layer and the optional additional absorbent layer is not particularly limited as long as it is mainly composed of a superabsorbent polymer, and hydrophilic fiber, for example, pulp fiber is further added. May be included. 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. The channels can be arranged in an absorbent layer and/or additional absorbent layers as desired. 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.
Further, it is preferable that the pair of channels be arranged in the absorption layer. This is because it is easy to induce deformation of the absorbent article.

The pair of channels may be arranged, for example, such that the spacing between the pair of channels is constant along the longitudinal direction of the absorber in a plan view, and the spacing 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 pair of channels may be arranged in the absorption layer, and the pair of channels may be arranged in a portion corresponding to the widthwise central region of the absorption layer, that is, in the widthwise central portion. As a result, when the absorber, and thus the absorbent layer, absorbs the liquid, the liquid is retained between the pair of channels, the central portion in the width direction of the absorbent layer is easily raised, and the void is easily removed.

The pair of channels preferably overlaps the end portion of the second sheet portion in the thickness direction of the absorbent article. Thereby, when the absorbent layer absorbs the liquid and bulges (swells) in the thickness direction together with the first sheet portion, the second sheet portion hardly bulges in the thickness direction due to the swelling of the absorbent layer, A void is more likely to be formed between the first sheet portion and the second sheet portion.

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 42a Second absorbent layer central portion 42b Second absorbent layer Adjacent portion 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 base material 47 Second water absorbent material 48 Channel 61 Elastic member 101 Void 103, 104 Orijiku L longitudinal direction W transverse direction T thickness direction CL longitudinal centerline CW widthwise center line LB low basis weight regions HB high basis weight region OP overlapping portion NP non-overlapped portion W _C widthwise central region W _A width direction Adjacent area

Claims (10)

A liquid-permeable sheet, a liquid-impermeable sheet, and an absorbent article between them, a longitudinal direction, an absorbent article having a width direction and a thickness direction,
The absorbent body, in the thickness direction, comprises an intermediate layer and an absorbent layer containing a superabsorbent polymer,
The absorbent body, in the width direction, is divided into a widthwise central region including a longitudinal centerline of the absorbent article and a pair of widthwise adjacent regions adjacent to the widthwise central region.
The intermediate layer comprises a first sheet portion far from the absorbent layer and a second sheet portion near the absorbent layer,
The first sheet portion is in contact with the absorbent layer in the widthwise central region, and is connected to a member existing on the liquid impermeable sheet side of the first sheet portion in the pair of widthwise adjacent regions. Not,
The second sheet portion is in contact with the absorbent layer in the pair of widthwise adjacent regions,
The absorbent article as described above. The absorbent article according to claim 1, wherein the first sheet portion and the second sheet portion are formed of an integral intermediate sheet that is folded in the thickness direction at a predetermined folding axis. The intermediate layer is formed of an integral intermediate sheet that extends in the longitudinal direction and is folded in the thickness direction at two folding axes that are separated from each other, and the first sheet portion is The second sheet portion is arranged inside the two folding axes of the one-piece intermediate sheet, and the second sheet portion is arranged outside the two folding axes of the one-piece intermediate sheet. Absorbent article. Each of the intermediate layer and an adjacent sheet adjacent to the liquid permeable sheet side of the first sheet portion includes a fiber, and the fiber diameter of the fibers forming the first sheet portion forms the adjacent sheet. The absorbent article according to any one of claims 1 to 3, which is larger than the fiber diameter of the fibers. The intermediate layer is arranged closer to the liquid permeable sheet than the absorbent layer, and the absorber is an intermediate layer, on the liquid permeable sheet side, an additional absorbent layer containing a super absorbent polymer. The absorbent article according to any one of claims 1 to 4, further comprising: The absorptivity according to claim 5, wherein the absorption layer includes a pair of channels in the widthwise central region, the pair of channels extending in the longitudinal direction and separated from each other in the widthwise direction. Goods. The absorbent article according to claim 6, wherein an end portion of the second sheet portion overlaps with the pair of channels in the thickness direction. The absorbent article according to claim 6, wherein the first sheet portion is in contact with the absorbent layer only between the pair of channels in the width direction. The said intermediate|middle layer has the junction part which joins a 1st sheet part and a 2nd sheet part partially in the position which overlaps in the said thickness direction, The any one of Claims 1-8. Absorbent article. The absorbent article according to claim 9, wherein the intermediate layer includes a heat-fusible fiber, and the joint portion is an embossed portion.

Images