JP6847188B2 - Absorbent article - Google Patents

Description

The present disclosure relates to absorbent articles.

Absorbent articles are known that include an absorber comprising a first absorbent layer containing a superabsorbent polymer, a second absorbent layer containing a superabsorbent polymer, and a fabric layer arranged between them. ..
For example, Patent Document 1 describes a water-absorbent sheet having a structure in which an absorbent layer containing a water-absorbent resin and an adhesive is sandwiched between hydrophilic non-woven fabrics, and satisfies the following requirements (1) and (2). It has a structure in which the absorption layer is divided into a primary absorption layer and a secondary absorption layer by a base material layer in which two or more layers of a breathable base material are bonded and laminated by an adhesive. Water-absorbing sheet: (1) The texture of the base material layer is 25 g / m ² or more, and (2) The adhesive between the breathable base materials is 0.1 to 50 g / m ² in amount. It is stated that it is glued.

International Publication No. 2010/143635

In the water-absorbent sheet (absorbent) described in Patent Document 1, the base material layer is made into a water-absorbent sheet (absorbent) due to (i) the water-absorbent resin (super absorbent polymer) being inferior in the absorption rate of the liquid. 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) and the absorbent article containing it is lowered. It has a function to suppress this.

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

The present disclosures include a liquid permeable sheet, a liquid permeable sheet, and an absorber between them, and are absorbent articles having a longitudinal direction, a width direction, and a thickness direction, as described above. The absorber includes an intermediate layer and an absorbent layer containing a superabsorbent polymer in the thickness direction, and the width of the absorber includes the longitudinal center line of the absorbent article in the width direction. The intermediate layer is divided into a central region in the direction and a pair of adjacent regions in the width direction adjacent to the central region in the width direction, and the intermediate layer is a first sheet portion far from the absorption layer and a second sheet portion close to the absorption layer. In the central region in the width direction, the first sheet portion is in contact with the absorption layer, and in the pair of adjacent regions in the width direction, the first sheet portion is on the liquid-impermeable sheet side. We have found an absorbent article that is not connected to an existing member and is characterized in that the second sheet portion is in contact with the absorbent layer in the pair of widthwise adjacent regions.

The absorbent articles of the present disclosure are excellent in repeatability.

FIG. 1 is a front view of the pants-type diaper 1 according to the first embodiment in the deployed state. FIG. 2 is a rear view of the pants-type diaper 1 in the unfolded state. FIG. 3 is a cross-sectional view of the pants-type diaper 1 along the line III-III of FIG. FIG. 4 is a cross-sectional view of the absorber 14 along lines III-III of FIG. 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 a pants-type diaper according to the second embodiment.

Specifically, the present disclosure relates to the following aspects.
[Aspect 1]
An absorbent article comprising a liquid-permeable sheet, a liquid-impermeable sheet, and an absorber between them, and having a longitudinal direction, a width direction, and a thickness direction.
The absorber includes an intermediate layer and an absorbent layer containing a super absorbent polymer in the thickness direction.
In the width direction, the absorber is divided into a center region in the width direction including the longitudinal center line of the absorbent article and a pair of adjacent regions in the width direction adjacent to the center region in the width direction.
The intermediate layer includes a first sheet portion far from the absorption layer and a second sheet portion close to the absorption layer.
The first sheet portion is in contact with the absorption layer in the central region in the width direction, and is connected to a member existing on the liquid impermeable sheet side of the first sheet portion in the pair of adjacent regions in the width direction. Not
The second sheet portion is in contact with the absorption layer in the pair of widthwise adjacent regions.
The above-mentioned absorbent article.

In the above-mentioned absorbent article, the first sheet portion is in contact with the absorbing layer in the central region in the width direction, and is a member existing on the liquid-impermeable sheet side of the first sheet portion in the pair of adjacent regions in the width direction. Since the second sheet portion is not connected and is in contact with the absorption layer in a pair of widthwise adjacent regions, it is referred to as a portion corresponding to the widthwise central region of the absorption layer (hereinafter, referred to as "widthwise central portion"). ) Absorbs the liquid, and when the central portion in the width direction of the absorption layer is raised in the thickness direction, the first sheet portion is raised accordingly, and the first sheet portion and the second sheet portion are separated from each other. A gap can be formed between the two.

The absorbent article then repeatedly absorbs the liquid, and the intermediate layer diffuses the liquid from the central region in the width direction to the pair of adjacent regions in the width direction while temporarily storing the liquid, and optionally into the absorption layer. When a liquid is supplied, when a portion of the absorption layer corresponding to a pair of adjacent regions in the width direction (hereinafter, referred to as "adjacent portion in the width direction") absorbs the liquid and expands, it may expand toward the void. As a result, the absorbable article is less likely to interfere with the absorbency of the liquid. From the above, the absorbent article is excellent in repetitive absorbability.

[Aspect 2]
The absorbent article according to aspect 1, wherein the first sheet portion and the second sheet portion are composed 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 composed of a predetermined one-piece intermediate sheet, the restoring force of the one-piece intermediate sheet at the folding shaft makes it easy for the gap to be formed. Therefore, the absorbent article is excellent in repeatability.

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

In the absorbent article, since the first sheet portion and the second sheet portion are composed of a predetermined one-piece intermediate sheet, the gap is likely to be formed by the restoring force of the one-piece intermediate sheet at the two folding shafts. Become. Further, when the absorbent article is worn by the wearer's thigh, when a force for narrowing the absorbent article is applied in the width direction, the force for narrowing the two folding shafts in the width direction is also applied, and the gap is created. It becomes easy to be formed. Therefore, the absorbent article is excellent in repeatability.

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

In the above-mentioned absorbent article, since the fiber diameter of the fiber constituting the first sheet portion is larger than the fiber diameter of the fiber constituting the adjacent sheet, the restoring force of the integral intermediate sheet at the folding shaft (two folding shafts) is increased. The size becomes larger, the voids are more likely to be formed, and the absorbent article is excellent in repetitive absorbability.

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

In the above-mentioned absorbent article, since the absorber includes two absorbent layers (absorbent layer and additional absorbent layer) with an intermediate layer sandwiched between them, the two absorbent layers are intermediate when the liquid is repeatedly absorbed. Since it can expand toward the voids formed in the layer, the absorbability of the liquid is less likely to be impaired in the absorbent article. From the above, the absorbent article is excellent in repetitive absorbability.

[Aspect 6]
The absorbent article according to aspect 5, wherein the absorbent layer comprises a pair of channels extending in the longitudinal direction and separated in the width direction in the central region in the width direction. ..

In the above-mentioned absorbent article, since the absorbent layer has a predetermined channel in the central portion in the width direction, the liquid that has reached the absorbent layer tends to stay between the pair of channels, and the central portion in the width direction of the absorbent layer becomes easy to stay. It becomes easy to rise, and the above-mentioned voids are likely to occur. Therefore, the absorbent article is excellent in repeatability.

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

In the absorbent article, the end 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 absorption layer than the portion other than the pair of channels, when the absorption layer absorbs the liquid and rises in the thickness direction, the pair of channels themselves becomes a pair. It is less likely to rise in the thickness direction than the part other than the channel.
Therefore, in the above-mentioned 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 expands in the thickness direction as the absorbent layer swells. It is less likely to rise, and a gap is more likely to be formed between the first sheet portion and the second sheet portion. Therefore, the absorbent article is excellent in repeatability.

[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 above-mentioned absorbent article, since the first sheet portion is in contact with the absorption layer only between the pair of channels, the first sheet portion is accurately raised when the central portion in the width direction of the absorption layer is raised. , A gap is more likely to be generated between the first sheet portion and the second sheet portion. Therefore, the absorbent article is excellent in repeatability.

[Aspect 9]
The item according to any one of aspects 1 to 8, wherein the intermediate layer has a joint portion for partially joining the first sheet portion and the second sheet portion at positions overlapping in the thickness direction. Absorbent article.

In the above-mentioned absorbent article, since the intermediate layer is provided with a predetermined joint portion, the absorber is less likely to be twisted even after the absorbent article has repeatedly absorbed the liquid.

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

In the above-mentioned absorbent article, since the joint portion is an embossed portion, the absorber is less likely to be twisted even after the absorbent article repeatedly absorbs the liquid.

The absorbent articles 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, the first embodiment), specifically, a pants-type diaper 1. Specifically, FIGS. 1 and 2 are a front view and a rear view of the pants-type diaper 1 in the unfolded state, respectively. FIG. 3 is a cross-sectional view of the pants-type diaper 1 along the line III-III of FIG. FIG. 4 is a cross-sectional view of the absorber 14 along lines III-III of FIG. 5A and 5B are views for explaining the absorber 14, FIG. 5A is a plan view, and FIG. 5B is a cross-sectional view taken along the line Vb-Vb in FIG. 5A. Is. 6 and 7 are diagrams for explaining the mechanism by which the absorber 14 absorbs the liquid. It should be noted that the drawings are schematic views, and in particular, in FIGS. 3 to 7, the thickness in the thickness direction T is drawn thicker than the actual thickness for the sake of understanding.

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 has a longitudinal center line CL extending through the center of the width direction W and extending in the longitudinal direction L. It has a width direction center line CW that passes through the center of the longitudinal direction L and extends in the width direction W. The directions and sides toward the center line CL in the longitudinal direction are defined as inward and inside of the width direction W, respectively, and the directions and sides away from it are defined as outward and outside of the width direction W, respectively. The directions and sides approaching the center line CW in the width direction are the inward direction and the inside of the longitudinal direction L, respectively, and the directions and sides away from the center line CW are the outward direction and the outside of the longitudinal direction L, respectively.

Further, the side of the pants-type diaper 1 corresponding to the wearer's abdomen in the longitudinal direction L toward the end edge (ventral edge) is also referred to as the front side of the longitudinal direction L, and the pants-type diaper corresponding to the wearer's back. The side of 1 toward the edge (dorsal edge) is also referred to as the rear side in the longitudinal direction L.
The "planar view" refers to viewing the pants-type diaper 1 in a state of being deployed in 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. The shape of the diaper.

The "planar direction" is any direction parallel to the plane including the width direction W and the longitudinal direction L.
"Skin side" and "non-skin side" mean the side relatively close to the wearer's skin surface and the side far from the wearer's skin surface in the thickness direction T when the pants-type diaper 1 is worn by the wearer, respectively. To do.
These definitions are commonly used not only for the pants-type diaper 1 but also for the absorber of the pants-type diaper 1 and each material arranged therein.

It should be noted that the member, structure, shape, etc. (hereinafter referred to as "member, etc.") are along the longitudinal direction L not only when the member, etc. is parallel to the longitudinal direction L, but also when the component Dx of the member, etc. However, the case where it is larger than the component Dy in the width direction W of the member or the like (Dx> Dy) is also included. Similarly, when a member or the like follows the width direction W, not only when the member or the like is parallel to the width direction W, but also when the component Dy in the width direction W of the member or the like is larger than the component Dx in the longitudinal direction L of the member or the like. It also includes the case where it is large (Dy> Dx). With respect to a member or the like having a curved surface, a curved surface or the like (hereinafter referred to as “curve or the like”), the member or the like is evaluated as described above for the tangent line of each point on the curved surface or the like.

As shown in FIGS. 1 and 2, the pants-type diaper 1 has a plane direction P and a thickness direction T orthogonal to each other, and the plane direction P is the longitudinal direction L and the width direction W of the pants-type diaper 1. including.
The pants-type diaper 1 is located between the ventral side (ventral waist belt) 2, the dorsal side (dorsal waist belt) 3, and the ventral side 2 and the dorsal side 3 in the longitudinal direction L. It is provided with an absorbent main body 10. In the first embodiment, the pants-type diaper 1 further includes a crotch portion 4 located between the ventral side portion 2 and the dorsal side portion 3. The ventral side 2 is a portion that comes into contact with the wearer's abdomen. The dorsal side portion 3 is a portion that comes into contact with the buttock portion or the back portion of the wearer. The absorbent body 10 is a portion that comes into contact with the crotch of the wearer, and one end portion in the longitudinal direction L is laminated on the ventral side portion 2 and the other end portion is laminated on the dorsal 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 and 2a in the width direction W of the ventral side 2 and both ends 3a and 3a of the width direction W of the dorsal side 3 are joined along the longitudinal direction L, whereby a pants-type diaper is used. 1 is formed. In the pants-type diaper 1, the waist opening through which the wearer's waist passes is defined by the outer end 2e of the longitudinal direction L in the ventral side 2 and the outer end 3e of the longitudinal direction L in the dorsal side 3. .. Further, in the pants-type diaper 1, a pair of leg openings through which the wearer's legs pass are defined by the side portions 5e and 5e on both sides of the crotch portion 4 in the width direction W. The ventral portion (ventral waist belt) 2 and the dorsal portion (dorsal waist belt) 3 are defined by a range defined in the longitudinal direction L where both end portions 2a and 2a and both end portions 3a and 3a are joined. It can be said that.

In the first embodiment, in the state shown in FIGS. 1 and 2, each of the ventral side portion 2 and the dorsal side portion 3 has a rectangular shape extending substantially 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 dorsal side portion 3, and both side edges in the width direction W are recessed inward in the width direction W. The ventral portion 2, the crotch portion 4, and the dorsal portion 3 are integrally formed with each other. In another embodiment (not shown), the ventral portion 2, the crotch portion 4 and the dorsal portion 3 are formed separately from each other. Further, in another embodiment (not shown), the pants-type diaper 1 includes a ventral portion 2 and a dorsal portion 3 and does not include a crotch portion 4.

In the first embodiment, the ventral side portion 2, the dorsal side portion 3, and the crotch portion 4 are provided with a liquid-impermeable cover sheet (seat 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 of the cover sheet 5b in the longitudinal direction L are folded back toward the skin so as to cover both ends of the cover sheet 5a in the longitudinal direction L. The cover sheet 5b at the folded position on the ventral side 2 and the dorsal side 3 constitutes the end portion 2e of the ventral side portion 2 and the end portion 3e of the dorsal side portion 3, respectively.

In the first embodiment, the ventral portion 2 and the dorsal portion 3 have a plurality of elastic members 6a, 6b and a plurality of elastic members 7a, 7b for waist gather, respectively, between the cover sheet 5a and the cover sheet 5b. Be prepared. The plurality of elastic members 6a and 6b are arranged on the outer side and the inner side of the ventral side portion 2 in the longitudinal direction L, respectively. The plurality of elastic members 6a are arranged at intervals in the longitudinal direction L along the width direction W in their respective predetermined regions on both sides of the longitudinal center line CL. The predetermined region is a region from the end portion 2a to the inner portion of the opposite edge of the absorbent 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 7a and 7b are arranged outside and inside the dorsal side portion 3 in the longitudinal direction L, respectively.

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

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

In the first embodiment, the absorbent body 10 has a substantially rectangular shape, and is between the liquid permeable sheet 12, the liquid permeable sheet 13, and the liquid permeable sheet 12 and the liquid permeable sheet 13. It is arranged and includes an absorber 14 that absorbs and retains a liquid such as urine. Examples of the liquid permeable sheet 12 include a liquid permeable non-woven fabric, a woven fabric, a synthetic resin film having liquid permeable holes formed therein, and a composite sheet thereof. Examples of the liquid-impermeable sheet 13 include a liquid-impermeable non-woven fabric, a synthetic resin film, and a composite sheet thereof, for example, an SMS non-woven fabric.

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

In the first embodiment, the absorbent body 10 includes a pair of side sheets 17, 17 located on both sides in the width direction W and extending in the longitudinal direction L on the surface on the skin side. Each side sheet 17 has a leak-proof wall 16 and fixed areas 15, 15. The fixing regions 15 and 15 are located at the front and rear ends of the side sheet 17 in the longitudinal direction L, and are fixed to the skin-side surface of the absorbent body 10. The leak-proof wall 16 is located between the fixed regions 15 and 15 on the front side and the rear side in the longitudinal direction L of the side sheet 17, is adjacent to them, and has a width direction W on the skin-side surface of the absorbent body 10. The outer edge of the 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, in the inner portion of the side sheet 17 in the width direction W, and the outer portion of the side sheet 17 in the width direction W is fixed to the absorbent body 10. ..

The pair of leakage-proof walls 16, 16 are arranged at both ends of the absorbent body 10 in the width direction W on the skin side so as to face each other, and extend continuously along the longitudinal direction L. Each leak-proof wall 16 includes two elastic members 61 extending along the longitudinal direction L at the inner end in the width direction W. The elastic member 61 is exemplified by a rubber thread. Each of the pair of leak-proof walls 16, 16 is formed of a hydrophobic sheet, for example, a hydrophobic non-woven fabric. In another embodiment, each of the pair of leak-proof 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 is an intermediate arranged between the first absorption layer 41 arranged on the skin side, the second absorption layer 42 arranged on the non-skin side, and the first absorption layer 41 and the second absorption layer 42. It includes a layer 43. The absorber 14 has a substantially rectangular planar shape extending in the longitudinal direction L.

In the width direction W, the absorber 14 has a width direction center region W _C including the longitudinal center line CL of the pants-type diaper 1 and a pair of width direction adjacent regions W _A adjacent to the width direction center region W _C. It is partitioned. Among the second absorbent layer 42, and the widthwise central region W _C, the overlapping region in the thickness direction T to the pair of width direction adjacent regions W _A, respectively, and a second absorbent layer center part 42a, the 2 It may be referred to as an absorption layer adjacent portion 42b.

In the first embodiment, the first absorbing layer 41 is arranged on the intermediate layer 43 side of the first base material 44 formed of a liquid-permeable sheet and the first base material 44, and contains a water-absorbing polymer. Includes a first water-absorbing material 45 having a water-absorbing material. The first absorbing layer 41 can be seen as having the first water absorbing material 45 as the absorbing 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 using an adhesive applied to at least one of the surface of the first base material 44 on the intermediate layer 43 side and the surface of the intermediate layer 43 on the first base material 44 side. And fixed to at least one of the intermediate layers 43.

The water absorbing material of the first water absorbing material 45 is arranged in the first absorbing layer 41 with a substantially uniform basis weight. The first water absorbing material 45 has a substantially rectangular planar shape. The first base material 44 has a substantially rectangular planar shape, covers the first water absorbing material 45 from the skin side in a plan view, and the peripheral portion of the first base material 44 is slightly from the periphery of the first water absorbing material 45. It extends to the outside.

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

The second water absorbing material 47 has a substantially rectangular planar shape that is one size larger in the width direction W and the longitudinal direction L than the first water absorbing material 45. The second base material 46 has a substantially rectangular planar shape, covers the second water absorbing material 47 from the non-skin side in a plan view, and the peripheral portion of the second base material 46 is from the periphery of the second water absorbing 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 absorbing material 47, while covering the skin-side surfaces of both ends of the first base material 44 in the width direction W. That is, on the skin-side surface at the end of the first absorption layer 41 in the width direction W, the end of the second base material 46 in the width direction W and the end of the first base material 44 in the width direction W overlap. It is joined together.

Both ends of the second base material 46 in the width direction W cover the side surface of the second water absorbing material 47 in the width direction W, and further cover the side surface of the first base material 44 in the width direction W, whereby the second water absorbing material 47 Is sealed in the second absorbing layer 42 in the width direction W, and the first water absorbing material 45 is sealed in the first absorbing 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 of the absorber 14 in the longitudinal direction L. As a result, the first water absorbing material 45 is sealed in the first absorbing layer 41 by the first base material 44 and the intermediate layer 43 in the longitudinal direction L, and the second water absorbing material 47 is intermediate with the second base material 46 in the longitudinal direction L. It is enclosed in the second absorption layer 42 by the layer 43.

In the first embodiment, the intermediate layer 43 has a substantially rectangular planar shape in a plan view, and has a low basis weight region LB having a relatively low basis weight and a pair of high basis weights having a relatively high basis weight. It has 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 area LB arranged in the center of the width direction W.

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

In the intermediate layer 43, a single intermediate sheet 43S is folded by 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 portions 43a. It is arranged on both sides in the width direction W, and a pair of second sheet portions 43b, 43b are arranged on the second absorption layer 42 side in the thickness direction T. In other words, the first sheet portion 43a is arranged at a position relatively far from the second absorption layer 42, and each of the pair of second sheet portions 43b, 43b is relatively far from the second absorption layer 42. It is placed in position.

The first sheet portion 43a is in the widthwise central region W _C, in contact with the second absorbent layer 42 (second absorber layer central portion 42a), and a second absorbent layer with a hot melt adhesive (not shown) 42 It is connected to (the central portion 42a of the second absorption layer). The first sheet portion 43a is in the pair of width direction adjacent regions W _A, member present in the liquid-impermeable sheet side of the first sheet portion 43a, specifically, the pair of second seat portion 43 b, 43 b Not connected to each of the hot melt adhesives.
The pair of second seat portion 43 b, each of 43 b, the pair of width direction adjacent regions W _A, in contact with the second absorbent layer 42 (second absorber layer adjacent portion 42b), and a hot-melt adhesive (shown It is connected to the second absorption layer 42 (adjacent portion 42b of the second absorption layer).

The portion where the first sheet portion 43a and the pair of the second sheet portions 43b and 43b each overlap in the thickness direction T constitutes the pair of overlapping portions OP of the intermediate layer 43, and the first The pair of second sheet portions 43b, 43b of the sheet portion 43a and the portions that do not overlap in the thickness direction T form the non-overlapping portion NP. Each of the pair of overlapping portions OP coincides with each of the pair of high basis weight regions HB, and each of the non-overlapping portions NP coincides with 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 (mounting surface) when forming the air-through non-woven fabric, and a non-net surface (not shown) on the opposite side of the net. It has. 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 is easily transferred from the side surface of the skin to the inside and then to the clothing surface (not shown) due to the capillary phenomenon, and by extension, the liquid transferred to the clothing surface of the intermediate layer 43. Is easily transferred to the second absorption layer 42. Further, the skin side surface (non-net surface) of the intermediate layer 43 having a relatively low fiber density can hold the first water absorbing material 45 contained in the first absorbing layer 41, and the retention of the super absorbent polymer. Excellent for.

In the intermediate layer 43, both end edges in the width direction W are sandwiched and joined to both ends of the first base material 44 and the second base material 46 in the width direction W, and both ends in the longitudinal direction L. The edges are sandwiched 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 band-shaped regions arranged at predetermined intervals on both sides in the width direction W with the longitudinal center line CL in between. Is. The channel 48 is arranged at least in the center of the second absorption layer 42 in the longitudinal direction L so as to straddle the center line CW in the width direction.

Each pair of channels 48, 48 are arranged on the second absorbent layer 42 (second absorber layer central portion 42a) in the width direction central area W _C. Each of the pair of channels 48, 48 is a region where the basis weight of the second water absorbing material 47 is smaller than the region around each of the pair of channels 48, 48 (the peripheral region in the central portion 42a of the second absorbing layer). 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, that is, the second water absorbing material 47 is recessed toward the intermediate layer 43.
Each of the pair of channels 48, 48 is arranged so as to overlap the pair of high basis weight regions HB (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 contain a super absorbent polymer (SAP). The basis weight of each of the super absorbent polymers of the first water-absorbing material 45 and the second water-absorbing material 47 can be appropriately adjusted according to the absorption performance required for the pants-type diaper 1, and is, for example, 10 to 500 g / m, respectively. ² is mentioned, preferably 100 to 400 g / m ² .

The basis weight of the first water absorbing material 45 and the second water absorbing material 47 may be larger than that of the other or equal to each other. However, "equivalent" means a range in which one is ± 30% of the other. The first water absorbing material 45 and the second water absorbing material 47 may further have hydrophilic fibers such as water absorbing fibers (for example, pulp fibers). The ratio of the super absorbent polymer in the first water absorbing material 45 and the second water absorbing 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 absorbing material 45 and the second water absorbing material 47 contain a super absorbent polymer as a main component, and the absorber 14 can be said to be a so-called SAP sheet.

However, as the ratio of the superabsorbent 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). 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 absorbing material 45 and the second water absorbing material 47 is composed of only a super absorbent polymer and does not contain hydrophilic fibers.
It is preferable that 90 to 100% by mass of the superabsorbent polymer is composed of superabsorbent polymer particles having a particle size of 150 to 500 μm. Since the superabsorbent polymer particles having the above particle size have a small particle size and are uniform, 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 can fix a super absorbent polymer, and examples thereof include a hot melt adhesive. The pattern of application 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 can be appropriately adjusted so that the liquid absorbency of the absorber 14 is not significantly reduced, and examples thereof include 3 to ^{50 g / m 2 for each layer.} However, each layer is an adhesive layer between the first water absorbing material 45 and the first base material 44, an adhesive layer between the first water absorbing material 45 and the intermediate layer 43, and the second water absorbing material 47 and the first layer. It means a layer of adhesive between the two base materials 46 and a layer of adhesive 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 liquid-permeable sheet. Examples of the first base material 44 include a liquid-permeable non-woven fabric containing synthetic fibers, a hydrophilic non-woven fabric, and a laminated non-woven fabric thereof, and among them, a non-woven fabric having high water permeability is preferable. Examples of the first base material 44 include polyolefin fibers such as polyethylene (PE) and polypropylene (PP), polyester fibers such as polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), and polyethylene naphthalate (PEN). , Or a spunbonded non-woven fabric formed from a combination thereof, an air-through non-woven fabric, and the like.
The synthetic fiber is preferably hydrophilized by a known method.

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

The first base material 44 may be a non-woven fabric of one or more of the above-mentioned non-woven fabrics laminated in a plurality of layers.
The basis weight of the first base material 44 is, for example, 10 to 100 g / m ² , preferably 20 to 80 g / m ² . The thickness of the first base material 44 is, for example, 0.1 to 5 mm, 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 diffusivity. The second base material 46 is formed from, for example, synthetic fibers such as polyamide fibers, recycled fibers such as rayon fibers and acetate fibers, natural fibers such as cotton, silk, hemp, and pulp (cellulose) fibers, or a combination thereof. Examples thereof include non-woven fibers. Specifically, examples of the second base material 46 include spunbonded non-woven fabrics containing nylon, spunlaced non-woven fabrics containing rayon fibers and / or pulp fibers, and the like. The spunlace non-woven fabric containing rayon fibers and / or pulp fibers may contain polyolefin fibers and / or polyester fibers. In the first embodiment, a spunlace non-woven fabric containing rayon fibers and pulp fibers, which has liquid retention and liquid diffusivity, is used.

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

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

In the first embodiment, as shown in FIG. 5, the absorber 14 includes a dorsal region BA, a ventral region FA, and a crotch region MA arranged along the longitudinal direction L. However, the dorsal region BA is a region that overlaps the dorsal portion 3 of the absorber 14 in the thickness direction T. The ventral region FA is a region of the absorber 14 that overlaps the ventral portion 2 in the thickness direction T. The crotch region MA is a region located between the dorsal region BA and the ventral region FA in the absorber 14, that is, a region overlapping the crotch portion 4 in the thickness direction T. Therefore, the absorber 14 is divided into a dorsal region BA that overlaps the dorsal portion 3, a ventral region FA that overlaps the ventral portion 2, and a crotch region MA that overlaps the crotch portion 4 along the longitudinal direction L. To.

In the first embodiment, the absorber 14 includes a SAP high basis weight region 14a, a SAP low basis weight region 14b, and a SAP non-arrangement region 14c. The SAP high basis weight region 14a is a region in which the superabsorbent polymer has a relatively high basis weight, and is a region in which the first absorption layer 41 and the second absorption 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 superabsorbent polymer is relatively low, and is a region in which the first absorption layer 41 does not exist in the thickness direction T and only the second absorption layer 42 exists. .. The SAP non-arranged region 14c is a region that does not contain a super absorbent polymer, and is a region in which the first absorption layer 41 and the second absorption layer 42 do not exist in the thickness direction T. However, the term "not containing a superabsorbent polymer" includes the case where a superabsorbent polymer exists but its basis weight is very small. “Very small” 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 dorsal region BA includes the dorsal SAP high basis weight region BAa as the SAP high basis weight region 14a, the back side SAP low basis weight region BAb as the SAP low basis weight region 14b, and the SAP. It is provided with a dorsal SAP non-arranged region BAc as a non-arranged region 14c. Further, in the absorber 14, the ventral region FA includes a ventral SAP high basis weight region FAa as the SAP high basis weight region 14a and a ventral SAP non-arrangement region FAc as the SAP non-arrangement region 14c. , Does not have a ventral SAP low basis weight region FAb. The crotch area MA has only the SAP high basis weight area 14a.
Therefore, the basis weight of the superabsorbent polymer in the dorsal SAP high basis weight region BAa and the ventral side SAP high basis weight region FAa is equivalent to the basis weight of the superabsorbent polymer in the crotch region MA. In addition, "equivalent" means that one is in the range of 0.7 to 1.3 times (± 30%) of the other.

The second absorbing layer 42 includes a protruding portion protruding outward from the edge of the first absorbing layer 41 at the rear end portion in the longitudinal direction L in a plan view. The protrusion includes a dorsal SAP low basis weight region BAb, and the protrusion is the same as the dorsal side SAP low basis weight region BAb. The second absorption layer 42 is covered with the intermediate layer 43, and therefore the protruding portion, that is, the dorsal side 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 absorber 14, in the longitudinal direction L, the length of the dorsal SAP high basis weight region BAa is set to da2, the length of the dorsal side SAP low basis weight area BAb is set to db2, and the length of the dorsal side SAP non-arrangement region BAc. Is dc2, then db2> dc2> da2. That is, in the dorsal region BA, the length of the dorsal SAP low basis weight region BAb is relatively long, and the basis weight of the superabsorbent polymer is kept low as a whole, up to the rear portion of the longitudinal direction L. A super absorbent polymer is placed. Although the amount is small, it is possible to easily suppress the leakage of the liquid flowing to the dorsal side.

In the absorber 14, in the longitudinal direction L, if the length of the ventral SAP high basis weight region FAa is da1 and the length of the ventral SAP non-arranged region FAc is dc1, then da1> dc1. That is, in the ventral region FA, the length of the ventral SAP high basis weight region FAa is relatively long to increase the basis weight of the superabsorbent polymer as a whole, up to the front end in the longitudinal direction L. A super absorbent polymer is placed. As a result, it is possible to facilitate the accurate absorption of the liquid on the ventral side, which has a large amount of excretion.

In the absorber 14, dc2> dc1 in the longitudinal direction L. The length of the ventral SAP non-arranged region FAc is relatively long while keeping the amount of superabsorbent polymer used in the dorsal region BA with low excretion low. Can be made relatively short to facilitate the accurate absorption of the liquid in the ventral region FA, which has a large amount of excretion.

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

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

Specifically, the first absorbent layer 41, liquid mainly passes through the first water-absorbing material 45 in the width direction central area W _C, the process proceeds to intermediate layer 43. The first water absorbing material 45 absorbs the remaining liquid and expands mainly in the thickness direction T.
Intermediate layer 43 has a function for temporarily storing a liquid, the intermediate layer 43, the central portion of the widthwise central region W _C (portion including the longitudinal centerline CL), low basis weight region LB (non-overlapping portion Since the NP) is arranged, the intermediate layer 43 temporarily stores the liquid in a small amount (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, in the widthwise center area W _C (second absorber layer central portion 42a), since the longitudinally extending L, a pair of channels 48 and 48 are arranged, the second absorbent layer 42 The liquid that has reached the above tends to stay between the pair of channels 48, 48 in the width direction and diffuses in the longitudinal direction L between the pair of channels 48, 48. As a result, the second water absorbing material 47 absorbs the liquid mainly between the pair of channels 48 and 48, and the second water absorbing material 47 mainly absorbs the liquid between the pair of channels 48 and 48 in the thickness direction T. Uplift.

The first water absorbing material 41 (first water absorbing material 45) and the second absorbing layer 42 (second water absorbing material 47) are raised in the thickness direction T, whereby the first water absorbing material 45 and the second water absorbing material are raised. A gap 101 is formed between the 47 and, specifically, the first sheet portion 43a and the pair of the 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 composed 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 gap 101 is likely to be formed by the restoring force of the integrated intermediate sheet 43S on the two folding shafts 103 and the folding shaft 104.

Further, in the intermediate layer 43, the first sheet portion 43a is arranged inside the two folding shafts 103 and the folding shaft 104 of the intermediate sheet 43S, and the pair of second sheet portions 43b, 43b is the intermediate sheet 43S. The two folding shafts 103 and 104 are arranged outside the folding shafts 103, that is, the two folding shafts 103 and the folding shafts 104 are arranged at both ends of the intermediate layer 43 in the width direction W, so that the pants type. When the wearer's thighs apply a force to narrow the pants-type diaper 1 in the width direction W when wearing the diaper 1, a force to narrow the two folding shafts 103 and 104 in the width direction W is also applied. Therefore, the void 101 is likely to be formed.

In the first embodiment, the fiber diameter of the composite fiber constituting the first sheet portion 43a (intermediate sheet 43S) of the intermediate layer 43 is larger than the fiber diameter of the fiber constituting the liquid permeable sheet 12. As a result, the restoring force of the intermediate sheet 43S on the two folding shafts 103 and the folding shaft 104 is large, and the gap 101 is likely to be formed.

Then, when additional liquid, for example, urine from the second time onward, reaches the absorber 14, the intermediate layer 43 temporarily stores the liquid in the void 101, and the liquid is a pair of widths from the _{central region W C in the width direction.} is diffused in directions adjacent regions W _a, on demand, for supplying liquid to the first water-absorbing material 45 and the second water absorbing member 47.

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

Each of the ends of the pair of second sheet portions 43b, 43b (the two folding shafts 103 and the ends opposite to the folding shaft 104) overlap with each of the pair of channels 48, 48 in the thickness direction T. ing. As a result, when the second absorption 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 and A gap 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 absorption layer 42, specifically the second base material 46, only between the pair of channels 48, 48 in the width direction W, specifically, hot melt adhesive. It is glued with an agent. As a result, when the central portion of the second absorption layer 42 in the width direction is raised, the first sheet portion 43a is accurately raised, and between the first sheet portion 43a and the pair of second sheet portions 43b, 43b. Voids 101 are more likely to occur.

Next, a method for producing 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 superabsorbent polymer is applied from the superabsorbent polymer supply device on both end portions and the center portion in the width direction W of the sheet for the second base material 46 coated with the hot melt adhesive, respectively, along the longitudinal direction L. And spray. At that time, a small amount of superabsorbent polymer is transferred to the region (corresponding to the channel) between both end portions and the central portion. Next, the sheet for the intermediate layer 43 coated with the hot melt adhesive on both sides is laminated on the super absorbent polymer on the sheet for the second base material 46.

Then, while moving the laminate in the longitudinal direction L, the superabsorbent polymer is applied from another superabsorbent polymer feeder to the central portion of the width direction W in the sheet for the intermediate layer 43 coated with the hot melt adhesive. Spray upward along the longitudinal direction L. Next, the sheet for the first base material 44 coated with the hot melt adhesive is laminated on the superabsorbent polymer on the sheet for the intermediate layer 43 with the hot melt adhesive on the superabsorbent polymer side. Then, both side portions of the second base material 46 sheet in the width direction W are folded back on both side portions of the first base material 44 sheet in the width direction W to obtain a laminate. Then, the laminate is passed through a pair of press rolls, that is, pressed to adjust the thickness of the laminate to obtain the absorber 14.

Next, a method for manufacturing a pants-type diaper using the absorber 14 will be described.
A liquid permeable sheet 12 is attached to the upper surface of the absorber 14 produced as described above (the surface of the first base material 44), and the liquid permeable sheet 12 is attached to the lower surface of the absorber 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-proof wall 16 are attached to both sides of the laminated body in the width direction W to obtain the absorbent main body 10. After that, the absorbent main body 10 is attached on the cover sheet 5 (including the elastic members 6, 7, 8), and the both ends 2a and 2a of the ventral side 2 in the width direction W and the width direction W of the back side 3 are Both ends 3a and 3a are joined. As a result, 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, may be referred to as a “second embodiment”), and is a diagram in the first embodiment. It is a figure corresponding to 4.

In the pants-type diaper according to the second embodiment (not shown), the ends of the pair of second seat portions 43b, 43b (the two folding shafts 103 and the ends opposite to the folding shaft 104) are the first embodiment. It is closer to the longitudinal center line (see FIG. 1 and the like) than the pants-type diaper 1 according to the above.
Further, 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 (pair of overlapping portions OP) of the intermediate layer 43. 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 respects, and thus the description thereof will be omitted.

In the pair of embossed portions 43c, the pants-type diaper (not shown) absorbs the 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 suppress the twist of the absorber 14.

The absorbent articles of the present disclosure are not particularly limited, and include, for example, disposable diapers, incontinence pads, disposable shorts, sanitary napkins, shorts-type sanitary napkins, panty liners, puerperal pads, breast milk pads, hemorrhoid pads, sweat pads, etc. Examples thereof include decubitus sheets (dressing sheets), diapers for pets, and sheets for pets.

In the absorbent article of the present disclosure, the absorber includes an intermediate layer and an absorbent layer containing a super absorbent polymer in the thickness direction of the absorbent article, and the intermediate layer is more liquid permeable than the absorbent. It can be arranged on the sheet side or on the liquid-impermeable sheet side. 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, so that 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 has a super absorbent polymer on the liquid permeable sheet side of the intermediate layer. It may further include an additional absorbing layer, i.e., the absorber may include two absorbing layers (absorbing layer and additional absorbing layer) with an intermediate layer in between. Thereby, the two absorption layers can expand toward the voids formed in the intermediate layer.
In the embodiment of the present specification (first embodiment and second embodiment), 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 absorber is a pair of widthwise adjacent regions adjacent to the widthwise central region including the longitudinal centerline of the absorbent article and 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 center line toward both end edges in the width direction, and each of the pair of widthwise adjacent regions is from the width direction edge of the absorber. It means a region of 20% toward the center line in the width direction. In other words, the central region in the width direction occupies 60% of the region in the width direction of the absorber, and each of the pair of adjacent regions in the width direction is 20% of the region in the width direction of the absorber (40 in total as the adjacent region in the width direction). %).

In the absorbent article of the present disclosure, the intermediate layer includes a first sheet portion far from the absorbent layer and a second sheet portion 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 articles of the present disclosure, the first sheet portion and the second sheet portion may be composed of a separate intermediate sheet, an integral 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. As a result, the voids are likely to be formed due to the restoring force of the integral sheet at the folding shaft.

In the absorbent articles of the present disclosure, the intermediate layer is an integral piece that 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. It is composed of an intermediate sheet, and the first sheet portion is arranged inside the two folding axes of the integrated intermediate sheet, and the second sheet portion is arranged outside the two folding axes of the integrated intermediate sheet. Is preferable. As a result, the gap is likely to be formed by the restoring force of the one intermediate sheet at the two folding shafts. Further, when the absorbent article is worn by the wearer's thigh, when a force for narrowing the absorbent article is applied in the width direction, the force for narrowing the two folding shafts in the width direction is also applied, and the gap is created. It becomes easy to be formed.

In the absorbent articles of the present disclosure, the first sheet portion is preferably located at least in the central region in the width direction and is also preferably located in a pair of adjacent regions in the width direction, and the second sheet portion is at least located in the widthwise adjacent region. It is located in at least one, preferably both, of the pair of widthwise adjacent regions. This is from the viewpoint of forming a void.
The second sheet portion may be arranged in the center region in the width direction as long as it does not reach the center line in the longitudinal direction.

In the absorbent article of the present disclosure, the first sheet portion is in contact with the absorbing layer (for example, a water absorbing material) in the central region in the width direction, and the first sheet portion does not go through the second sheet portion. It is in contact with (for example, a water absorbing material). Further, it is preferable that the first sheet portion is connected to the absorbing layer (for example, a water absorbing material) in the central region in the width direction by, for example, a hot melt adhesive, embossing or the like. This is to accurately form a gap between the first sheet portion and the second sheet portion.

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

The first sheet portion is partially connected to a member existing on the liquid-impermeable sheet side of the first sheet portion, for example, the second sheet portion in a pair of widthwise adjacent regions at a joint portion. May be good. This is from the viewpoint of suppressing the twist of the absorber when the absorber forms a void. The joint 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 not easily affected by liquids. In the case of the embossed portion, it is preferable that the intermediate layer contains heat-sealing fibers and the heat-sealing fibers are fused in the embossed portion.

In the absorbent articles of the present disclosure, the second sheet portion is in contact with the absorbing layer (for example, a water absorbing material) in a pair of widthwise adjacent regions, and the absorbing layer (for example, a water absorbing material), for example, a hot melt adhesive. It is preferable that they are connected by embossing or the like. This is to accurately form a 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, a liquid permeable sheet, a second sheet) adjacent to the liquid permeable sheet side of the first sheet portion can contain fibers thereof. In some cases, the fiber diameters of the fibers constituting the first sheet portion can have an arbitrary relationship with the fiber diameters of the fibers constituting the adjacent sheet, but the fiber diameters of the fibers constituting the first sheet portion are adjacent to each other. It is preferably larger than the fiber diameter of the fibers constituting 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 more likely to be formed.

In the absorbent articles of the present disclosure, each of the absorbent layer and the optionally additional absorbent layer comprises a super absorbent polymer. The superabsorbent polymer is not particularly limited, and includes those known in the art, and examples thereof include starch-based, cellulosic-based, and synthetic polymer-based superabsorbent polymers. Examples of the starch-based or cellulose-based superabsorbent polymer include a starch-acrylic acid (salt) graft copolymer, a saponified product of a starch-acrylonitrile copolymer, and a crosslinked product of sodium carboxymethyl cellulose. Examples of the superabsorbent polymer of the system include polyacrylate-based, polysulfonate-based, maleate anhydride-based, polyacrylamide-based, polyvinyl alcohol-based, polyethylene oxide-based, polyaspartate-based, and polyglutamate-based. , Polyarginate-based, starch-based, cellulose-based and other superabsorbent polymers (SAP, Super Absorbent Polymer) and the like, and polyacrylate-based (particularly sodium polyacrylate-based) superabsorbent polymers are preferable. ..

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 super absorbent polymer, and hydrophilic fibers such as pulp fibers are further added. It may be included. The shape of the absorber is not particularly limited in a plan view, and examples thereof include a rectangle having a short side protruding in an arc shape, a rectangle with rounded corners, an ellipse, and an hourglass. The thickness of the absorber is, for example, 0.5 to 20 mm, preferably 1 to 10 mm.

In the absorbent articles of the present disclosure, the absorber can comprise a channel. The channels can be arranged in an absorption layer and / or an additional absorption layer if desired. As a result, when the absorbent article is worn, the absorbent body, and thus the absorbent article, is easily deformed and induced. From this point of view, the channels preferably extend along the longitudinal direction, and more preferably a pair of channels extend along the longitudinal direction with a longitudinal centerline in between.
Moreover, it is preferable that the pair of channels are arranged in the absorption layer. This is from the viewpoint of easiness of inducing deformation of the absorbent article.

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

The pair of channels can be arranged in the absorption layer, and the pair of channels can 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 absorbing layer, absorbs the liquid, the liquid is held between the pair of channels, and the central portion in the width direction of the absorbing layer is easily raised, and thus the voids are easily returned.

The pair of channels preferably overlap with the edge of the second sheet portion in the thickness direction of the absorbent article. As a result, when the absorption layer absorbs the liquid and rises (swells) in the thickness direction together with the first sheet portion, the second sheet portion does not easily rise in the thickness direction as the absorption layer swells. A gap is more likely to be formed between the first sheet portion and the second sheet portion.

1 Pants-type diaper 2 Ventral part (ventral waist belt)
3 Dorsal part (dorsal waist belt)
4 Crotch part 5,5a, 5b Cover sheet 10 Absorbent body 12 Liquid permeable sheet 13 Liquid impermeable sheet 14 Absorber 41 1st absorption layer 42 2nd absorption layer 42a 2nd absorption layer Central part 42b 2nd absorption layer Adjacent part 43 Intermediate layer 43S Intermediate sheet 43a 1st sheet part 43b 2nd sheet part 43c Embossed part 44 1st base material 45 1st water absorbing material 46 2nd base material 47 2nd water absorbing material 48 channels 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 (7)

An absorbent article comprising a liquid-permeable sheet, a liquid-impermeable sheet, and an absorber between them, and having a longitudinal direction, a width direction, and a thickness direction.
The absorber includes an intermediate layer and an absorbent layer containing a super absorbent polymer in the thickness direction.
In the width direction, the absorber is divided into a center region in the width direction including the longitudinal center line of the absorbent article and a pair of adjacent regions in the width direction adjacent to the center region in the width direction.
The intermediate layer includes a first sheet portion far from the absorption layer and a second sheet portion close to the absorption layer.
The first sheet portion is in contact with the absorption layer in the central region in the width direction, and the second sheet portion exists on the liquid impermeable sheet side of the first sheet portion in the pair of adjacent regions in the width direction. Not connected to
The second sheet portion is in contact with the absorption layer in the pair of widthwise adjacent regions.
The intermediate layer is arranged on the liquid permeable sheet side with respect to the absorption layer, and the absorber has an additional absorption layer containing a super absorbent polymer on the liquid permeable sheet side of the intermediate layer. Further prepared,
The absorption layer comprises a pair of channels in the central region in the width direction, extending in the longitudinal direction and separated in the width direction.
The end of the second sheet portion overlaps the pair of channels in the thickness direction.
The absorbent article. An absorbent article comprising a liquid-permeable sheet, a liquid-impermeable sheet, and an absorber between them, and having a longitudinal direction, a width direction, and a thickness direction.
The absorber includes an intermediate layer and an absorbent layer containing a super absorbent polymer in the thickness direction.
In the width direction, the absorber is divided into a center region in the width direction including the longitudinal center line of the absorbent article and a pair of adjacent regions in the width direction adjacent to the center region in the width direction.
The intermediate layer includes a first sheet portion far from the absorption layer and a second sheet portion close to the absorption layer.
The first sheet portion is in contact with the absorption layer in the central region in the width direction, and the second sheet portion exists on the liquid impermeable sheet side of the first sheet portion in the pair of adjacent regions in the width direction. Not connected to
The second sheet portion is in contact with the absorption layer in the pair of widthwise adjacent regions.
The intermediate layer is arranged on the liquid permeable sheet side with respect to the absorption layer, and the absorber has an additional absorption layer containing a super absorbent polymer on the liquid permeable sheet side of the intermediate layer. Further prepared,
The absorption layer comprises a pair of channels in the central region in the width direction, extending in the longitudinal direction and separated in the width direction.
The first sheet portion is in contact with the absorption layer only between the pair of channels in the width direction.
The absorbent article. The absorbent article according to claim 1 or 2, wherein the first sheet portion and the second sheet portion are composed of an integral intermediate sheet that is folded in the thickness direction at a predetermined folding axis. The intermediate layer is composed of an integral intermediate sheet that extends in the longitudinal direction and is folded in the thickness direction at two folding shafts that are separated from each other, and the first sheet portion is formed. the disposed inside the two folding axes of integral intermediate sheet, the second sheet part is disposed on the inner side of the two folding axes of the intermediate sheet of the integral of the preceding claims The absorbent article according to any one item. The intermediate layer and the adjacent sheet adjacent to the liquid permeable sheet side of the first sheet portion each contain fibers, and the fiber diameter of the fibers constituting the first sheet portion constitutes the adjacent sheet. The absorbent article according to any one of claims 1 to 4, which is larger than the fiber diameter of the fiber. The invention according to any one of claims 1 to 5, wherein the intermediate layer has a joint portion for partially joining the first sheet portion and the second sheet portion at positions overlapping in the thickness direction. Absorbent article. The absorbent article according to claim 6, wherein the intermediate layer contains heat-sealing fibers and the joint portion is an embossed portion.

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