JP7199339B2 - absorbent article - Google Patents

Description

The present invention relates to absorbent articles.

Absorbent articles are known that include an absorbent body that includes a low basis weight portion.

For example, Patent Document 1 includes a top sheet, a back sheet, and an absorbent body disposed between the top sheet and the back sheet, the absorbent body having a low basis weight portion extending in the longitudinal direction, An absorbent article is disclosed having a skin care agent applied to the topsheet so as to at least partially overlap the low basis weight portion.
In general, when the absorbent body has a low basis weight portion, the absorbent body is easily deformed to fit the wearer, and the fit of the absorbent article to the wearer is enhanced.

Japanese Patent Publication No. 2017-509447

However, in the absorbent article described in Patent Document 1, since the low basis weight portion has a low basis weight of the super absorbent polymer, the skin care agent is applied so as to overlap with the low basis weight portion. Ingredients contained in permeate in the thickness direction of the low basis weight portion and soften the adhesive or the like fixing the super absorbent polymer. As a result, the strength of the absorbent body is weakened near the low basis weight portion. When the superabsorbent polymer swells after absorbing bodily fluids and stress is applied to the absorbent body, the absorbent body may lose its shape, which may cause problems in fitting the absorbent article to the wearer.
In addition, in an absorbent body provided with a low basis weight portion, the superabsorbent polymer swells after absorbing bodily fluids, and may take a structure in which the periphery is raised compared to the low basis weight portion. Here, in the absorbent article described in Patent Document 1, the skin care agent is applied on the surface sheet so as to partially overlap with the low basis weight portion. A skin care agent applied to a position superimposed with . is difficult to come into contact with the skin, and there is a possibility that the skin care agent cannot act effectively on the skin.
Therefore, the present invention has been made in view of the above problems, and has an excellent fit to the wearer even after absorbing body fluids, and has an absorbency that allows the skin care agent to effectively act on the wearer's skin. The purpose is to provide goods.

In order to solve the above problems, the inventors of the present invention have provided a top sheet, a back sheet, and an absorbent body disposed between the top sheet and the back sheet, and and a thickness direction, wherein the absorbent body includes at least an absorbent core and a core wrap sheet covering at least the non-skin side of the absorbent core, wherein the absorbent core has an absorbent 90% by mass or more of the superabsorbent polymer is contained with respect to the total amount of the material, and the superabsorbent polymer is fixed to the core wrap sheet with an adhesive at least on the non-skin side of the absorbent core, The absorbent core has a low basis weight portion that extends along the longitudinal direction and has a low basis weight of the superabsorbent polymer compared to the surrounding area. Provided is an absorbent article having a skin care agent-applied portion coated with a skin care agent containing ingredients, wherein the skin care agent-applied portion does not overlap with the low basis weight portion in the thickness direction.

The absorbent article of the present invention is excellent in fit to the wearer even after absorbing bodily fluids, and allows the skin care agent to effectively act on the wearer's skin.

FIG. 4 is a plan view showing a state in which the underpants-type diaper is unfolded; FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1; FIG. 2 is a diagram showing a configuration example of an absorber, where (a) is a plan view and (b) is a cross-sectional view taken along line IIIb-IIIb in (a). It is a cross-sectional schematic diagram which shows the mode of the shape change before and behind water absorption of an absorber.

<Aspect of the present invention>
The present invention relates to the aspects shown below.

[First aspect]
(composition)
An absorbent article comprising a top sheet, a back sheet, and an absorbent body disposed between the top sheet and the back sheet, and having a longitudinal direction, a width direction, and a thickness direction perpendicular to each other,
The absorbent body includes at least an absorbent core and a core wrap sheet covering at least the non-skin side of the absorbent core,
The absorbent core contains 90% by mass or more of superabsorbent polymer with respect to the total amount of absorbent material,
The superabsorbent polymer is fixed to the core wrap sheet with an adhesive on at least the non-skin side of the absorbent core,
The absorbent core has a low basis weight portion extending along the longitudinal direction and having a low basis weight of the superabsorbent polymer compared to the surrounding area,
A member positioned closer to the skin than the absorbent core has a skin care agent application portion coated with a skin care agent containing a skin care component,
The absorbent article, wherein the skin care agent application portion does not overlap the low basis weight portion in the thickness direction.

(effect)
The absorbent article of the first aspect of the present invention contains a superabsorbent polymer of 90% by mass or more with respect to the total amount of absorbent material, and has a low basis weight portion in which the absorbent core extends along the longitudinal direction. Therefore, after absorbing bodily fluids, the periphery of the low grammage part tends to bulge compared to the low grammage part, and the periphery of the part overlapping the low grammage part in the thickness direction is the skin surface of the wearer. easy to reach.
Here, the absorbent article has a skin care agent applied portion around a portion overlapping the low basis weight portion in the thickness direction on a member located closer to the skin than the absorbent core. Therefore, since the skin care agent does not exist in the portion overlapping the low basis weight portion in the thickness direction, the skin care agent fixes the superabsorbent polymer at least on the non-skin side of the absorbent core in the low basis weight portion. Hard to soften the adhesive. In addition, in the region adjacent to the low basis weight portion, the superabsorbent polymer has a higher basis weight than the low basis weight portion, so the skin care agent is less likely to permeate into the absorbent core. Therefore, even if the superabsorbent polymer swells after absorbing bodily fluids, the absorbent body is unlikely to lose its shape.
Furthermore, since the skin care agent does not overlap with the low basis weight portion in the thickness direction, the skin care agent easily comes into contact with the wearer's skin after absorbing bodily fluids, and the skin care agent tends to act effectively on the wearer's skin.

[Second aspect]
(composition)
The absorbent article according to the first aspect, comprising the skin care agent application portion on the skin side of the topsheet.

(effect)
According to the second aspect of the present invention, since the skin-care agent application portion is arranged on the skin side of the topsheet, the skin-care agent easily acts directly on the wearer's skin, and the skin-care agent is more effective on the wearer's skin. easy to act effectively. In addition, since the skin care agent is placed far from the adhesive that fixes the superabsorbent polymer, the adhesive is less likely to soften, and thus the absorbent body is less likely to lose its shape.

[Third aspect]
(composition)
Laminated absorbent in which the absorbent core is formed by laminating a first absorbent material containing the superabsorbent polymer, an intermediate layer, and a second absorbent material containing the superabsorbent polymer in this order from the skin side toward the non-skin side. The absorbent article of the first or second aspect, which is a core.

(effect)
According to the third aspect of the present invention, since the absorbent core has an intermediate layer in addition to the water absorbent materials that are the first water absorbent material and the second water absorbent material each containing a superabsorbent polymer, even after absorption of bodily fluids, The intermediate layer easily maintains the structure of the absorbent core, and the absorbent body does not easily lose its shape. Therefore, the fit property of the absorbent article after absorption of bodily fluids is further enhanced.

[Fourth aspect]
(composition)
The absorbent article according to the third aspect, wherein the intermediate layer is an air-through nonwoven fabric.

(effect)
The air-through nonwoven fabric is a nonwoven fabric in which entangled portions between fibers are heat-sealed, and has high mechanical strength. According to the fourth aspect of the present invention, the intermediate layer, which is an air-through nonwoven fabric, easily retains the shape of the absorbent body, and the absorbent body does not easily lose its shape even after absorbing body fluids. Improves fit after absorption.

[Fifth aspect]
(composition)
The absorbency of the third or fourth aspect, wherein the dimensions of the second water absorbent material in the longitudinal direction and the width direction are respectively larger than the maximum dimensions of the first water absorbent material in the longitudinal direction and the width direction. Goods.

(effect)
According to the fifth aspect of the present invention, the dimensions in the longitudinal direction and the width direction of the second absorbent material are larger than the maximum dimensions in the longitudinal direction and the width direction of the first absorbent material, respectively. In the vicinity of , the basis weight of the superabsorbent polymer is increased, and body fluid can be effectively absorbed. In addition, since the basis weight of the superabsorbent polymer is low at the edges in the longitudinal direction and the width direction of the absorbent body, the fit of the absorbent article to the wearer is further enhanced.

[Sixth aspect]
(composition)
The absorbent article according to the fifth aspect, wherein the skin care agent application portion overlaps the first water absorbent material in the thickness direction.

(effect)
According to the sixth aspect of the present invention, the skin care agent-applied portion is provided in a region overlapping the first absorbent material in the thickness direction, in which the basis weight of the superabsorbent polymer is higher than that of the surrounding area. , the skin care agent is more likely to come into contact with the wearer's skin, and the skin care agent is more likely to act more effectively on the wearer's skin.

[Seventh aspect]
(composition)
In the second water absorbing material, the basis weight of the superabsorbent polymer in the low basis weight portion is lower than that around the low basis weight portion,
In the first water absorbent material, the basis weight of the superabsorbent polymer in the low basis weight portion is the same as that around the low basis weight portion.
The absorbent article according to any one of the third to fifth aspects.

(effect)
According to the seventh aspect of the present invention, the low basis weight part is provided by reducing the basis weight of the superabsorbent polymer in the corresponding region of the second water absorbent material, while the first water absorbent material has Since the low basis weight part is not provided and the basis weight of the superabsorbent polymer in the first water absorbent material is kept high, the skin care agent applied to the member located closer to the skin than the absorbent core is absorbed. It hardly permeates into the core, and the absorbent body hardly loses its shape after absorbing bodily fluids. Therefore, the fit of the absorbent article to the wearer is further improved.

<Pants-type disposable diaper>
Hereinafter, an underpants-type disposable diaper (hereinafter also simply referred to as "underpants-type diaper") according to the embodiment will be described. However, the type of underpants-type diaper is not limited to this example, and other types of underpants-type diapers may be used as long as they do not deviate from the spirit and scope of the present invention. Such pants-type diapers include, for example, three-piece diapers. In addition, the absorbent article of the present invention is not limited to the pants-type diaper 1, but includes tape-fastened disposable diapers, incontinence pads used in combination with other absorbent articles, light incontinence pads, sanitary napkins, It may be a panty liner or the like.

FIG.1 and FIG.2 is a figure which shows the structural example of the underpants type diaper 1 which concerns on embodiment. FIG. 1 is a plan view showing the unfolded state of the pants-type diaper 1, and FIG. 2 is a cross-sectional view taken along line II-II of FIG. In addition, in FIG. 2, in order to facilitate understanding of the underpants-type diaper 1 of the present embodiment, the dimension in the thickness direction T is shown enlarged. 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 which are orthogonal to each other, and a longitudinal center line CL extending in the longitudinal direction L passing through the center of the width direction W. , and a widthwise center line CW passing through the center in the longitudinal direction L and extending in the widthwise direction W. The direction and the side approaching the longitudinal center line CL are the inward direction and the inner side in the width direction W, respectively, and the direction and the side away from the longitudinal direction center line CL are the outward direction and the outer side in the width direction W, respectively. The direction and the side approaching the width direction center line CW are defined as the inward direction and the inner side in the longitudinal direction L, respectively, and the direction and the side away from the width direction center line CW 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 facing the edge of the pants-type diaper 1 corresponding to the abdomen of the wearer (the edge of the abdomen) is also referred to as the front side in the longitudinal direction L, and the pants-type diaper corresponding to the back of the wearer. The side facing the edge of 1 (edge on the dorsal side) is also referred to as the rear side in the longitudinal direction L. The term “planar view” refers to viewing from above the thickness direction T of the pants-type diaper 1 unfolded on a plane including the longitudinal direction L and the width direction W, and the “planar shape” is grasped in plan view. shape A “planar direction” is any direction parallel to a plane including the width direction W and the longitudinal direction L. The terms "skin side" and "non-skin side" refer to the sides relatively close to and far from the wearer's skin surface in the thickness direction T when the pants-type diaper 1 is worn by the wearer, respectively. The skin-side surface of each member of the pants-type diaper 1 is referred to as a "skin side", and the non-skin-side surface is referred to as a "non-skin side". These definitions are commonly used not only for the underpants-type diaper 1 but also for the absorber 14 of the underpants-type diaper 1 and each material arranged therein.

It should be noted that the term "member, structure, shape, etc. along the longitudinal direction L" does not only mean that the member is parallel to the longitudinal direction L, but also that the component Dx in the longitudinal direction L of the member is the component in the width direction W of the member. It also includes the case where it is greater than Dy (Dx>Dy). Similarly, when the member or the like is along 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 greater than the component Dx in the longitudinal direction L of the member or the like. Larger cases (Dy>Dx) are also included. For curvilinear or curved members, etc., the member, etc. is evaluated as described above for the tangent to each point on the curve, etc.

As shown in FIG. 1, the pants-type diaper 1 includes, in the longitudinal direction L, an abdominal portion (abdominal waist belt) 2, a back portion (back waist belt) 3, an abdominal portion 2, and a back portion. an absorbent body 10 located between 3. In this embodiment, the pants-type diaper 1 further includes a crotch portion 4 positioned between the abdominal portion 2 and the dorsal portion 3 . The abdominal portion 2 is a portion that contacts the abdomen of the wearer. The dorsal portion 3 is a portion that contacts the buttocks or back of the wearer. The absorbent main body 10 is a portion that abuts on the crotch of the wearer, and one end in the longitudinal direction L is laminated on the abdominal side 2 and the other end is laminated on the dorsal side 3 . The crotch part 4 is a part that supports the absorbent main body 10 from the non-skin side. Both ends 2a, 2a in the width direction W of the ventral part 2 and both ends 3a, 3a in the width direction W of the dorsal part 3 overlap in the thickness direction T and are joined along the longitudinal direction L. Thus, the underpants-type diaper 1 is formed. In this case, in the pants-type diaper 1, the outer edge 2e in the longitudinal direction L of the abdominal portion 2 and the outer edge 3e in the longitudinal direction L of the back portion 3 form a waist opening through which the waist of the wearer passes. defined. Further, in the pants-type diaper 1, the side portions 5e, 5e on both sides in the width direction W of the crotch portion 4 define a pair of leg openings through which the wearer's legs pass. In addition, the abdominal part (abdominal waist belt) 2 and the dorsal part (dorsal waist belt) 3 are portions defined in the longitudinal direction L where both ends 2a, 2a and both ends 3a, 3a are joined. It can be said.

In this embodiment, in the state shown in FIG. 1, the ventral portion 2 and the dorsal portion 3 each have a rectangular shape extending generally in the width direction W and are spaced apart in the longitudinal direction L from each other. The crotch part 4 is located between the ventral part 2 and the dorsal part 3, and both side edges in the width direction W are recessed inward in the width direction W. The ventral part 2, the crotch part 4 and the dorsal part 3 are integrally formed with each other. In another embodiment, the ventral portion, crotch portion and dorsal portion are formed separately from each other. Further, in another embodiment, the pant diaper includes a ventral portion and a dorsal portion and does not include a crotch portion.

In this embodiment, the ventral portion 2, the dorsal portion 3, and the crotch portion 4 are provided with a liquid-impermeable cover sheet (sheet member) 5. As shown in FIG. 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 sheets 5a and 5b are laminated in the thickness direction T and joined to each other with an adhesive 51 or the like. Both ends in the longitudinal direction L of the cover sheet 5b are folded back toward the skin so as to cover both ends in the longitudinal direction L of the cover sheet 5a. In this case, the cover sheets 5b at the folded positions of the abdominal portion 2 and the dorsal portion 3 constitute the end portion 2e of the ventral portion 2 and the end portion 3e of the dorsal portion 3, respectively.

Examples of the cover sheet 5 include liquid-impermeable sheets such as liquid-impermeable nonwoven fabrics, synthetic resin films, composite sheets thereof, SB nonwoven fabrics, and SMS nonwoven fabrics. Examples of materials for the cover sheet 5 include polyolefin materials such as polypropylene and polyethylene. The basis weight of the cover sheet 5 is, for example, 5-100 g/m ² , preferably 10-50 g/m ² . The dimension (thickness) of the cover sheet 5 in the thickness direction T is, for example, 0.1 to 5 mm, preferably 0.1 to 2 mm. In other embodiments, there is one cover sheet, or more than three (not shown). In yet another embodiment the cover sheet is not folded (not shown).

[Absorptive body]
Next, the absorbent main body 10 will be described with reference to FIGS. 1 to 4. FIG. However, FIG. 3 is a diagram showing a configuration example of the absorbent body 14 according to the embodiment, (a) is a plan view, (b) is a cross-sectional view along the IIIb-IIIb line in (a), FIG. 4 is a schematic cross-sectional view showing how the absorber 14 changes its shape before and after absorbing water. In this embodiment, the absorbent body 10 has a substantially rectangular shape, a liquid-permeable topsheet 12 , a liquid-impermeable backsheet 13 , and positioned between the topsheet 12 and the backsheet 13 . and an absorbent body 14 that absorbs and retains liquid. Examples of the surface sheet 12 include a liquid-permeable non-woven fabric, a woven fabric, a synthetic resin film having liquid-permeable holes, and a composite sheet thereof. Examples of the backsheet 13 include liquid-impermeable nonwoven fabrics, synthetic resin films, composite sheets thereof, SMS nonwoven fabrics, and the like. The absorbent body 14 in this embodiment includes an absorbent core that absorbs and retains liquid and a core wrap sheet that encloses the absorbent core. Details of the absorbent body 14 will be described later. The absorbent body 14 and the topsheet 12 and the backsheet 13 are respectively bonded with an adhesive 51, and the topsheet 12 and the backsheet 13 are bonded with the adhesive 51 at their peripheral edge portions. The adhesive 51 may be a known material for pants-type diapers, such as a hot-melt adhesive. The shape of the absorbent main body 10 is not limited to the above examples as long as it is elongated in the longitudinal direction L. Examples thereof include a rectangle with rounded corners, a rectangle with an outwardly curved short side, and an hourglass shape. In another embodiment, the back sheet is omitted, and the non-skin side surface of the absorbent body and the non-skin side surface of the peripheral portion of the top sheet are joined to the cover sheet.

(Skin care agent applied part)
In this embodiment, the skin side surface of the surface sheet 12 has a skin care agent application portion 18 to which a skin care agent containing a skin care component is applied. basis weight portion) in the thickness direction T. As shown in FIG. 4, when the absorbent body 14 absorbs water, the absorbent body 14 swells with the skin side surface of the absorbent body 14 slightly depressed in the region overlapping the channels 48, 48 in the thickness direction T. In the region overlapping the channels 48, 48 in the thickness direction T, the distance from the skin side of the absorbent body to the intermediate layer 43 and the second base material 46 is smaller than the surrounding area, but the channel Since the skin care agent is not present in the regions overlapping with 48, 48 in the thickness direction, the skin care agent is absorbed in the channels 48, 48 on the non-skin side of the absorbent core (e.g., the second substrate 46). It is difficult to soften the adhesive 51 that fixes the . Also, in the regions adjacent to the channels 48, 48, the superabsorbent polymer has a higher basis weight than the channels 48, 48, so the skin care agent does not easily penetrate into the absorbent core. It is difficult to soften the adhesive 51 that fixes the super absorbent polymer on the non-skin side. Therefore, even if the superabsorbent polymer swells after absorbing bodily fluids, the absorbent core 14 is unlikely to lose its shape. In addition, after the absorber 14 absorbs bodily fluids, the areas around the channels 48, 48 tend to bulge, and the areas around the channels 48, 48 tend to come into contact with the wearer's skin. Furthermore, since the skin care agent does not overlap the channels 48, 48 in the thickness direction T, the skin care agent easily comes into contact with the wearer's skin after bodily fluid absorption, and the skin care agent tends to act effectively on the wearer's skin. . In the present embodiment, the skin-care agent application portion 18 is arranged on the skin side of the topsheet 12, but the skin-care agent directly acts on the wearer's skin, so that the skin-care agent acts more effectively on the wearer's skin. Since the skin care agent is arranged at a position far from the adhesive 51 that fixes the super absorbent polymer, the adhesive 51 is hard to soften and the absorbent body 14 is hard to lose its shape. In another embodiment, the underpants type diaper has a second sheet (not shown) between the topsheet and the absorbent body, and a skin care agent is applied to a position of the second sheet that does not overlap the channels in the thickness direction. An applicator is provided. In yet another embodiment, the skin care agent application part is provided on the skin side or non-skin side of the intermediate layer, and in this case, the absorbent core means the second absorbent material, and the skin side of the intermediate layer. may be provided with a first absorbent material and a first base material, which are additional absorbent cores.

In this embodiment, the skin care agent contains skin care ingredients. In the present embodiment, skin care ingredients include water-soluble vitamins (e.g., vitamin B1, vitamin B2, vitamin B3, vitamin B5, vitamin B6, vitamin B7, vitamin B9, vitamin B12, vitamin C), fat-soluble vitamins (e.g., Vitamin A group, vitamin D group, vitamin E group, and vitamin K group) amino acids (e.g., alanine, arginine, lysine, histidine, proline, hydroxyproline, etc.), peptides, pH adjusters to keep the skin weakly acidic ( (e.g., malic acid, succinic acid, citric acid, tartaric acid, lactic acid, etc.), plant extracts (e.g., Botan, Ogon, Hypericum perforatum, chamomile, licorice, peach, mugwort, perilla extract, etc.), drugs (e.g., skin astringents, anti-inflammatory acne agents, anti-wrinkle agents, anti-cellulite agents, whitening agents, antibacterial agents, antifungal agents, etc.). In addition, the skin care agent may contain an oil base. As the oily base, a liquid, solid, or gel can be used. , silicone oil, silicone resin, etc.), and hydrocarbons (eg, paraffin, etc.). In another embodiment, the skin care agent contains, in addition to the skin care ingredients described above, a fragrance component, a cooling sensation component such as menthol, and the like. It can be perceived by smell or cutaneous sensation.

(Absorber)
The absorbent body 14 is a layer having liquid absorption performance and liquid retention performance, and in this embodiment, the absorbent body 14 includes an absorbent core that absorbs and retains liquid, and the absorbent core extends from the skin side to the non-skin side. It consists of a laminated absorbent core in which a first absorbent material 45, an intermediate layer 43 and a second absorbent material 47 are laminated in this order, and a core wrap sheet. Moreover, in this embodiment, the core wrap sheet is composed of the first base material 44 and the second base material 46 . In another embodiment, the absorbent body may not include the first substrate 46 . In this embodiment, the absorbent body 14 includes a first absorbent layer 41 located on the skin side and comprising a first absorbent material 45 and a first base material 44, and a first absorbent layer 41 located on the non-skin side and comprising a second absorbent material 47 and a second It can also be viewed as comprising a second absorbent layer 42 comprising two substrates 46 and an intermediate layer 43 positioned between the first absorbent layer 41 and the second absorbent layer 42 . In this case, the absorber 14 may be considered to have a two-layer structure in which the first absorbent layer 41, the intermediate layer 43, and the second absorbent layer 42 are laminated in the thickness direction T in this order. In another embodiment, the absorbent body has a single-layer structure in which the intermediate layer 43 is not present and the first absorbent layer and the second absorbent layer are integrated in the thickness direction.

In this embodiment, the absorber 14 has a substantially rectangular planar shape extending in the longitudinal direction L. As shown in FIG. However, the shape is not particularly limited, and examples thereof include a rectangle with arcuate protruding short sides, a rectangle with rounded corners, an ellipse, and an hourglass. The thickness of the absorbent body 14 is, for example, 0.5 to 20 mm, preferably 1 to 10 mm.

(First water absorbing material)
In this embodiment, the first absorbent layer 41 has a first water absorbent material 45 forming part of a laminated absorbent core, which is an absorbent core, and a first substrate 44 as a core wrap sheet. The first water absorbing material 45 is fixed to the intermediate layer 43 with an adhesive 51 in at least a partial region of the surface of the intermediate layer 43 on the first substrate 44 side, The surface is not fixed to the intermediate layer 43 side surface of the first base material 44 by the adhesive 51 . In another embodiment, the first water absorbent is an adhesive in at least a partial region of the surface of the intermediate layer on the first substrate side and at least a partial region of the surface of the first substrate on the intermediate layer side. is fixed to the intermediate layer and the first base material. The absorbent material of the first absorbent material 45 is arranged in the first absorbent layer 41 with a substantially uniform basis weight. However, the basis weight at the ends in the longitudinal direction L and/or the width direction W may gradually decrease toward the edges. In another embodiment, the absorbent material of the first absorbent material is arranged in a predetermined distribution having areas of high basis weight and areas of low basis weight within the first absorbent layer. The first water absorbent 45 has a substantially rectangular planar shape.

(Second water absorbing material)
In this embodiment, the second absorbent layer 42 has a second absorbent material 47 forming part of a laminated absorbent core, which is an absorbent core, and a second substrate 46 as a core wrap sheet. The second water absorbing material 47 is fixed to the second base material 46 with an adhesive 51 in at least a partial region of the surface of the second base material 46 on the intermediate layer 43 side, and the second base material 46 of the intermediate layer 43 is The side surface is not fixed to the surface of the intermediate layer 43 on the second substrate 46 side by the adhesive 51 . In another embodiment, the second water absorbent is an adhesive in at least a partial region of the surface of the intermediate layer on the second substrate side and at least a partial region of the surface of the second substrate on the intermediate layer side. is fixed to the intermediate layer and the second base material. The absorbent material of the second absorbent material 47 is arranged at a substantially uniform basis weight within the second absorbent layer 42, except for a pair of channels 48, 48 (described later; low basis weight portion). However, the basis weight at the ends in the longitudinal direction L and/or the width direction W may gradually decrease toward the edges.

In this embodiment, the dimension in the width direction W of the second water absorbent 47 is larger than the maximum dimension in the width direction W of the first water absorbent 45 . Furthermore, in the present embodiment, the dimension in the longitudinal direction L of the second water absorbent material 47 is larger than the maximum dimension in the longitudinal direction L of the first water absorbent material 45 . In this case, the second water absorbing material 47 can be regarded as having 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 . As a result, the basis weight of the superabsorbent polymer increases in the vicinity of the excretion port contact portion, and body fluids can be effectively absorbed. In addition, since the basis weight of the superabsorbent polymer is low at the edges in the longitudinal direction L and the width direction W of the absorber 14, the fit of the pants-type diaper 1 to the wearer is further enhanced. However, in another embodiment, the dimensions in the width direction W and the longitudinal direction L of the second water absorbent may be the same as the dimensions in the width direction W and the longitudinal direction L of the first water absorbent. In the embodiment, the dimensions in the width direction W and the longitudinal direction L of the first water absorbent material may be larger than the maximum dimensions in the width direction W and the longitudinal direction L of the second water absorbent material.

In the present embodiment, the above-described skin care agent application portion 18, preferably the entire skin care agent application portion 18, does not overlap the channels 48, 48 in the thickness direction. It is provided in a region overlapping in the direction T. That is, the skin care agent application portion 18 is provided in a region overlapping with the high absorption region 14a described later in the thickness direction T, excluding the region overlapping with the channels 48, 48 in the thickness direction T. . Therefore, in the region where the skin care agent-applied portion 18 overlaps in the thickness direction T, the basis weight of the superabsorbent polymer is higher than in the surrounding area, so that the skin care agent is more likely to come into contact with the skin of the wearer. to act more effectively on the wearer's skin.

(Super absorbent polymer)
The first water absorbent material 45 and the second water absorbent material 47 contain a super absorbent polymer (SAP). The first water absorbent material 45 and the second water absorbent material 47 contain 90 mass % or more of the superabsorbent polymer with respect to the total amount of the water absorbent material. The first water absorbent material 45 and the second water absorbent material 47 may further comprise hydrophilic fibers such as pulp fibers and water absorbent fibers. Therefore, it can be said that the first water absorbent material 45 and the second water absorbent material 47 contain the superabsorbent polymer as a main component, and the absorbent body 14 can be said to be a so-called SAP sheet. However, the ratio of the superabsorbent polymer to the absorbent body 14 (including not only the first water absorbent material 45 and the second water absorbent material 47 but also the adhesive 51, the first base material 44, the intermediate layer 43 and the second base material 46) Examples include 40 to 80% by mass, preferably 50 to 80% by mass, and more preferably 60 to 80% by mass. In this embodiment, the first water absorbent material 45 and the second water absorbent material 47 are composed only of superabsorbent polymers and do not contain hydrophilic fibers. In another embodiment, the first water absorbent material and the second water absorbent material contain pulp fibers and/or water absorbent fibers in addition to the superabsorbent polymer.

In addition, in specifying the content of the superabsorbent polymer in the absorbent body 14 and the first water absorbent material 45 and the second water absorbent material 47, the absorbent body 14 is hollowed out in a predetermined area in the thickness direction and Depending on the condition, the adhesive 51 is softened by heating or the like, the nonwoven fabric, the adhesive 51, the superabsorbent polymer, the pulp fiber, etc. constituting each layer are separated, and the weight of each component is measured. The basis weight of the component may be determined, and the content of the superabsorbent polymer may be specified based on the calculated basis weight. In addition, the water-absorbent material means a high-molecular-weight absorbent typified by a superabsorbent polymer, as well as pulp fibers and water-absorbent fibers.

The superabsorbent polymer is not particularly limited as long as it can absorb and retain moisture, and examples thereof include particulate or fibrous superabsorbent polymers. The basis weight of the superabsorbent polymer of the first water absorbent material 45 can be appropriately adjusted according to the absorption performance required for the pants-type diaper 1. For example, it is 10 to 500 g/m ² , preferably 40 to 400 g. /m ² , more preferably 100 to 400 g/m ² . The basis weight of the superabsorbent polymer of the second water absorbent material 47 can be appropriately adjusted according to the absorption performance required for the pants-type diaper 1. For example, it is 10 to 500 g/m ² , preferably 40 to 400 g. /m ² , more preferably 100 to 400 g/m ² . One of the basis weights of the first water absorbing material 45 and the second water absorbing material 47 may be larger than the other, or may be equal. However, equivalent refers to the range of ±30% of the other.

Examples of superabsorbent polymers include starch-based, cellulose-based, and synthetic polymer-based high-molecular absorbents. Starch-based or cellulose-based superabsorbent polymers include, for example, starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and crosslinked products of sodium carboxymethylcellulose. Examples of synthetic polymer-based superabsorbent polymers include polyacrylates, polysulfonates, maleic anhydrides, polyacrylamides, polyvinyl alcohols, polyethylene oxides, polyaspartates, and polyglutamic acid. Examples include salt-based, polyalginate-based, starch-based, and cellulose-based. In this embodiment, a polyacrylate-based (in particular, sodium polyacrylate-based) superabsorbent polymer is preferred. Further, in the present embodiment, it is preferable that 90 to 100% by mass of the superabsorbent polymer in the absorbent body 14 is composed of superabsorbent polymer particles having a particle size of 150 to 500 μm. Since the superabsorbent polymer particles having such a particle size distribution are small and uniform in particle size, they are easily held by the adhesive 51 . The particle size of superabsorbent polymer particles is measured according to the sieving test method described in JIS R 6002:1998.

(channel)
In this embodiment, the absorbent body 14 has a pair of channels 48, 48 extending along the longitudinal direction L. As shown in FIG. In this embodiment, a pair of channels 48 , 48 are provided in the second absorbent material 47 . That is, in the channels 48, 48, the basis weight of the superabsorbent polymer in the second water absorbent material 47 is lower than that around the channels 48, 48 in the second water absorbent material 47, and the first water absorbent in the channels 48, 48 The basis weight of the superabsorbent polymer in the material 45 is comparable to the perimeter of the channels 48, 48 in the first absorbent material 45. By adopting such a configuration, the skin care agent applied to the surface sheet 12 is less likely to penetrate into the absorbent core, and the absorbent body 14 is less likely to lose its shape after absorbing bodily fluids. The pair of channels 48, 48 are belt-like regions extending along the longitudinal direction L and arranged at predetermined intervals on both sides in the width direction W with the longitudinal center line CL interposed therebetween. The channel 48 is formed at least in the central portion in the longitudinal direction L so as to straddle the widthwise center line CW. In another embodiment, the channel is formed to reach at least one of the edges in the longitudinal direction L. The pattern of the pair of channels 48, 48 in plan view is, for example, a pattern formed so that the interval between the two is constant along the longitudinal direction L. As shown in FIG. In another embodiment, the pattern of the pair of channels is, for example, a pattern that is narrow near the center in the longitudinal direction L and widens toward both sides in the longitudinal direction L. FIG. Here, the channel 48 is a region (low basis weight portion) in which the basis weight of the superabsorbent polymer is lower than the area around the channel in the absorbent body 14. For example, the channel 48 in the second absorbent layer 42 A region having a lower basis weight of the superabsorbent polymer compared to the surrounding region, including the case where the basis weight is zero. The channel 48 is formed such that the second base material 46 is recessed toward the intermediate layer 43 side, that is, the second water absorbent material 47 is recessed toward the intermediate layer 43 side. In another embodiment, the second water absorbent is formed so as to be recessed toward the second substrate. Also, the pair of channels 48, 48 overlap in the thickness direction T with the pair of heat seal portions 43c, 43c. In another embodiment, at least a portion of the channel does not overlap the heat seal portion 43c in the thickness direction T. It should be noted that in another embodiment, the channels extend along the width direction W instead of or only in the longitudinal direction L. In yet another embodiment, the channel is one or a plurality of three or more. In yet another embodiment, the second absorbent material does not have the pair of channels 48,48 and the first absorbent material has a pair of channels.

(middle layer)
As described above, in this embodiment, the absorbent body 14 includes the intermediate layer 43 . As a result, the intermediate layer 43 can easily maintain the structure of the absorbent core even after absorbing bodily fluids, and the absorbent core 14 is unlikely to lose its shape. Therefore, the fitting property of the pants-type diaper 1 after absorption of bodily fluids is enhanced. The intermediate layer 43 is a liquid-permeable sheet and has a substantially rectangular planar shape. In this embodiment, the intermediate layer 43 includes an upper layer 43a and a pair of lower layers 43b, 43b adjacent to both sides in the width direction W on the non-skin side surface of the upper layer 43a. The intermediate layer 43 is formed by folding a pair of side portions located on both sides of the central portion in the width direction W of a sheet member having a substantially rectangular planar shape to the non-skin side of the central portion and overlapping them. At that time, the central portion of the sheet member becomes the upper layer 43a, and the pair of side portions of the sheet member become the pair of lower layers 43b, 43b. Therefore, both sides of the intermediate layer 43 in the width direction W have a two-layer structure in which the upper layer 43a and the lower layer 43b are laminated, and have a substantially rectangular shape extending in the longitudinal direction L. A portion 43d near the center in the width direction W of the intermediate layer 43 has a single layer structure of only the upper layer 43a and has a substantially rectangular shape extending along the longitudinal direction L. As shown in FIG. The two-layer structure upper layer 43a and lower layer 43b are joined by a pair of heat seal portions 43c, 43c extending along the longitudinal direction L on both sides in the width direction W of the portion 43d. The heat-sealed portion 43c is formed by compressing while heating. In another embodiment, the upper and lower layers of the two-layer structure are joined by embossments extending along the longitudinal direction L on both sides in the width direction W of a portion near the center in the width direction W. An embossment is formed by pressing. In yet another embodiment, the heat seal or embossment has multiple dots, multiple curves or patterns. Both edges in the width direction W of the intermediate layer 43 are sandwiched between both edges in the width direction W of the first substrate 44 and the second substrate 46, and both edges in the longitudinal direction L are sandwiched between the first substrate 44 and the second substrate 46. The two substrates 46 are clamped at both ends in the longitudinal direction L and joined to each other. In another embodiment, both edges in the longitudinal direction L are not sandwiched between and joined to both ends in the longitudinal direction L of the first substrate and the second substrate. The two-layer structure allows the liquid to be temporarily stored, making it easier to secure the time required for absorption of the superabsorbent polymer.

As the intermediate layer 43, for example, the same sheet as the first base material 44 can be used. The basis weight of the intermediate layer 43 is, for example, 10-100 g/m ² , preferably 15-80 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 this embodiment, the intermediate layer 43 is an air-through nonwoven fabric. In general, an air-through nonwoven fabric is a nonwoven fabric in which entangled portions between fibers are heat-sealed, and has high mechanical strength. Therefore, the intermediate layer 43, which is an air-through nonwoven fabric, has a certain resistance to the load from the outside and easily retains the shape of the absorbent body 14, and the absorbent body 14 does not easily lose its shape even after absorbing bodily fluids. Therefore, the fit of the underpants-type diaper 1 after absorption of bodily fluids is enhanced. In another embodiment, the intermediate layer is a hydrophilic, liquid-permeable, air-through nonwoven fabric composed of thermoplastic synthetic fibers. In this case, liquid permeability can be ensured even when the absorber absorbs water.

In the present embodiment, core-sheath type conjugate fibers using a thermoplastic resin as at least the sheath component constituting the fiber surface are employed as the fibers constituting the air-through nonwoven fabric. By adopting a thermoplastic resin as the sheath component that constitutes the fiber surface, the fiber exhibits heat-sealing properties. Therefore, the resin component used as the core component is appropriately selected according to the desired physical properties of the intermediate layer 43. can. For example, as the above-mentioned core-sheath type conjugate fiber, by using a conjugate fiber using a relatively strong resin component as a core component that does not constitute the fiber surface, it has a stronger resistance to tensile stress etc. An intermediate layer can be provided. Examples of resins that can be used as the core component and the sheath component include polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, and ionomer resin. polyolefins such as polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polylactic acid, and the like; polyamides such as nylon, and the like. In the present embodiment, it is preferable to use a polyolefin resin such as polyethylene or polypropylene as the sheath component for the purpose of achieving both thermal adhesiveness and tensile strength, and the above polyolefin resin or polyethylene terephthalate as the core component. It is preferable to use a polyester-based resin such as However, the intermediate layer 43 is not limited to the air-through nonwoven fabric, and may be a sheet having liquid permeability.

In this embodiment, as shown in FIG. 3, the absorber 14 has a dorsal region BA, an abdominal region FA, and a crotch region MA, which are aligned along the longitudinal direction L. As shown in FIG. However, the dorsal region BA is a region that overlaps with the dorsal portion 3 in the thickness direction T of the absorbent body 14 . Abdominal area FA is an area that overlaps with abdominal part 2 in absorber 14 in thickness direction T. As shown in FIG. The crotch area MA is an area located between the dorsal area BA and the ventral area FA of the absorbent body 14, that is, the area overlapping the crotch part 4 in the thickness direction T. As shown in FIG. Therefore, the absorbent body 14 is divided along the longitudinal direction L into a dorsal area BA overlapping with the dorsal part 3, an abdominal area FA overlapping with the ventral part 2, and a crotch area MA overlapping with the crotch part 4. be done.

(high absorption area, low absorption area, non-arrangement area)
In this embodiment, the absorbent body 14 includes a high absorption area 14a, a low absorption area 14b, and a non-arrangement area 14c. The high absorption region 14a is a region where the first absorption layer 41 and the second absorption layer 42 are overlapped in the thickness direction T. As shown in FIG. The low absorption region 14b 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 non-placement area 14c is an area that does not contain the superabsorbent polymer, and is an area in which the first absorbent layer 41 and the second absorbent layer 42 are not present in the thickness direction T. As shown in FIG. However, the term "no superabsorbent polymer is included" includes the case where the superabsorbent polymer is present 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 high absorption area 14a. The high absorption area 14a, the low absorption area 14b and the non-arrangement area 14c have a substantially rectangular shape. However, the shape is not particularly limited, and examples thereof include a rectangle with arcuate protruding short sides, a rectangle with rounded corners, an ellipse, and an hourglass. Further, in plan view, in the longitudinal direction L and the width direction W, the low absorption region 14b is a region surrounding the high absorption region 14a in a substantially frame shape (surrounding at least three sides). The outer dimensions are 5-25% larger than the outer dimensions of the high absorption region 14a. The non-arrangement region 14c is a region surrounding the low absorption region 14b in a substantially frame shape, and the outer dimensions of the non-arrangement region 14c are 3 to 15% larger than the outer dimensions of the low absorption region 14b. The basis weight of the low absorption area 14b is, for example, 40 to 60% of the basis weight of the high absorption area 14a, and the basis weight of the non-arrangement area 14c is, for example, 0% of the basis weight of the high absorption area 14a. ~5%. In addition, when it is difficult to distinguish between two regions, such as when the absorbent body 14 is a single layer that does not have the first absorbent layer 41 and the second absorbent layer 42, the high absorption region is the water absorbent material (including the adhesive 51). ) is defined as a region from the highest value to 50% of the highest value. The low basis weight part is a region where the thickness of the water absorbing material (including the adhesive 51) is in the range of 50% to 5% of the maximum value, and the non-arrangement area is the water absorbing material (including the adhesive 51). Let the thickness range from 5% to 0% of the maximum value. The thickness is the arithmetic mean height (Ra: JIS B 0601-2001).

Therefore, in the absorbent body 14, the dorsal region BA includes the dorsal high absorbency region BAa as the high absorbency region 14a, the dorsal low absorbency region BAb as the low absorbency region 14b, and the non-placement region 14c. and a dorsal non-placement area BAc. In the absorber 14, the ventral area FA includes the ventral high absorbency area FAa as the high absorbency area 14a and the ventral non-arrangement area FAc as the non-arrangement area 14c. The crotch area MA has only the high absorption area 14a. Therefore, the basis weight of the superabsorbent polymer in the back high absorbency area BAa and the ventral high absorbency area FAa is the same as the basis weight of the superabsorbent polymer in the crotch area MA. The term “equivalent” means that one is in the range of 0.7 to 1.3 times (±30%) the other. In another embodiment, the ventral region includes a ventral low absorbency region as a low absorbency region in addition to the ventral high absorbency region and ventral non-deployment region.

Here, the second absorbent layer 42 includes a protruding portion that protrudes outward from the edge of the first absorbent layer 41 at the rear end in the longitudinal direction L in plan view. The protrusion includes the dorsal low absorption area BAb, and in this embodiment the protrusion is the same as the dorsal low absorption area BAb. The second absorbent layer 42 is covered with an intermediate layer 43, so that the protruding part, i.e. the dorsal low absorption area BAb, is covered with the intermediate layer 43 and the first substrate 44 on the skin side. Furthermore, in the present embodiment, the second absorbent layer 42 includes widthwise protrusions that protrude outward from the edges of the first absorbent layer 41 at both ends in the width direction L in plan view. The width direction protrusion is covered with the intermediate layer 43 and the first base material 44 on the skin side. In another embodiment, the second absorbent layer includes another protrusion projecting outward from the edge of the first absorbent layer at the front end in the longitudinal direction L in plan view. Other protrusions include the ventral low density zone. In yet another embodiment, the protrusion or dorsal low-absorbency zone is covered on the skin side by one of the intermediate layer and the first substrate and not the other. In yet another embodiment, the second absorbent layer does not include widthwise protrusions that protrude outward from the edges of the first absorbent layer at both ends in the width direction W in a plan view.

(core wrap sheet)
As described above, the absorbent body 14 has the first base material 44 and the second base material 46 as core wrap sheets.

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. extend outwards. 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. Extends slightly outward. At this time, both ends in the width direction W of the second base material 46 cover both side surfaces of the second water absorbent material 47 and also cover the skin-side surfaces at both ends in the width direction W of the first base material 44 . That is, on the skin-side surface at the end in the width direction W of the first absorbent layer 41, the end in the width direction W of the second base material 46 and the end in the width direction W of the first base material 44 overlap each other. and spliced.

In this manner, both ends in the width direction W of the second base material 46 cover the side surfaces in the width direction W of the second water absorbent material 47, and further cover the side surfaces in the width direction W of the first base material 44. A second absorbent material 47 is enclosed in the second absorbent layer 42 in the width direction W, and a first absorbent material 45 is enclosed in the first absorbent layer 41 in the width direction W. In another embodiment, both ends in the width direction W of the first substrate cover the side surfaces in the width direction W of the first water absorbent material, and further cover the side surfaces in the width direction W of the second substrate. In yet another embodiment, at both ends in the width direction W, the first base material, the intermediate layer and the second base material are laminated in the thickness direction T and joined.

In the present embodiment, the first base material 44, the intermediate layer 43 and the second base material 46 are laminated in the thickness direction T and joined at both ends in the longitudinal direction L of the absorbent body 14. FIG. As a result, the first water absorbent material 45 is enclosed in the second absorbent layer 42 by the first base material 44 and the intermediate layer 43 in the longitudinal direction L, and the second water absorbent material 47 is enclosed in the longitudinal direction L between the second base material 46 and the intermediate layer 43 . It is encapsulated in the second absorbent layer 42 by the layer 43 . In another embodiment, both ends in the longitudinal direction L of the absorbent body are not covered with the first substrate and the second substrate. In yet another embodiment, the absorbent body does not comprise a first substrate.

(First base material)
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 liquid-permeable nonwoven fabrics, hydrophilic nonwoven fabrics, and laminated nonwoven fabrics thereof, among which highly water-permeable nonwoven fabrics are preferred. For example, formed from polyolefin fibers such as polyethylene (PE), polypropylene (PP), polyester fibers such as polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), polyethylene naphthalate (PEN), or combinations thereof. Examples include spunbond nonwoven fabrics and air-through nonwoven fabrics. These fibers are preferably hydrophilized by a known method. Alternatively, for example, air-laid nonwoven fabrics in which hydrophilic fibers such as pulp fibers or rayon fibers are coated with a hydrophilic binder, and spunlace nonwoven fabrics in which the above hydrophilic fibers and the above synthetic fibers are combined can be used. In the present embodiment, an air-laid nonwoven fabric having liquid permeability and liquid retention properties, in which pulp fibers are coated with a hydrophilic binder, is used. As the first base material 44, one type or multiple types of nonwoven fabrics among the nonwoven fabrics described above may be laminated in multiple layers. The basis weight of the first base material 44 is, for example, 10-100 g/m ² , preferably 20-80 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.

(Second base material)
The second base material 46 is not particularly limited as long as it is a sheet having water retentivity and liquid diffusibility. Examples of the fibers forming the second base material 46 include water-absorbing fibers, and examples of the sheet having water retention and liquid diffusibility include water-absorbing nonwoven fabric. This makes it easier for the second base material 46 to diffuse bodily fluids in the longitudinal direction L and the width direction W, and the second water absorbent material 47 evenly absorbs water, so that the absorber 14 is less likely to lose its shape. Examples of water-absorbent fibers include synthetic fibers such as polyamide fibers, regenerated fibers such as rayon fibers and acetate fibers, and natural fibers such as cotton, silk, hemp, and pulp (cellulose) fibers. Examples of the water-absorbent nonwoven fabric formed from the absorbent fibers include a nonwoven fabric formed using only one type of the above-mentioned water-absorbent fibers, and a non-woven fabric formed from a combination of a plurality of water-absorbent fibers. Specific examples include spunbond nonwoven fabrics containing nylon and spunlaced nonwoven fabrics containing rayon fibers and/or pulp fibers. Spunlace nonwoven fabrics and spunbond nonwoven fabrics containing water-absorbing fibers are excellent in diffusing body fluids in the longitudinal direction L and the width direction W, so that the absorbent body 14 expands uniformly in the longitudinal direction L and the width direction W when absorbing body fluids. The absorber 14 hardly loses its shape. Spunlaced nonwovens containing rayon fibers and/or pulp fibers may contain polyolefin fibers and/or polyester fibers. In this embodiment, a spunlaced nonwoven fabric containing rayon fibers and pulp fibers, which has liquid retention and liquid diffusion properties, is used. As the second base material 46, one type or multiple types of nonwoven fabrics among the nonwoven fabrics described above may be laminated in multiple layers. The basis weight of the second base material 46 is, for example, 10-200 g/m ² , preferably 35-150 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.

In another aspect, both the first substrate and the second substrate may be sheets having water retentivity and liquid diffusibility, and both the first substrate and the second substrate may be liquid It may be a sheet having transparency.

(Adhesive 51)
The adhesive 51 to be applied to the first base material 44, the intermediate layer 43, and the second base material 46 is not particularly limited as long as it is an adhesive 51 capable of fixing the superabsorbent polymer, and examples thereof include hot melt adhesives. be done. The application pattern of the adhesive 51 is not particularly limited, but examples thereof include a continuous or intermittent omega pattern, spiral pattern, and line pattern. The basis weight of the adhesive 51 can be appropriately adjusted so that the liquid absorbency of the absorbent body 14 is not significantly lowered, and is, for example, 3 to 50 g/m ² for each layer. However, each layer means a layer of the adhesive 51 between the first water absorbing material 45 and the first base material 44, a layer of the adhesive 51 between the first water absorbing material 45 and the intermediate layer 43, and a second water absorbing material. a layer of adhesive 51 between 47 and the second substrate 46;

(leakage barrier)
In this embodiment, the absorbent main body 10 includes a pair of side sheets 17, 17 positioned on both sides in the width direction W and extending in the longitudinal direction L on the skin-side surface. Each side sheet 17 has a leakproof wall 16 and fixing areas 15,15. The fixing regions 15 , 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 positioned between and adjacent to the fixed regions 15, 15 on the front side and the rear side in the longitudinal direction L of the side sheet 17, and extends in the width direction W on the skin-side surface of the absorbent main body 10. is fixed at the outer edge thereof, and the inner edge thereof in the width direction W is not fixed. In this case, the leak-proof wall 16 and the fixing regions 15, 15 are formed, for example, by 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 main body 10. be. Thus, the absorbent body 10 comprises a pair of leakproof walls 16,16. The pair of leak-proof walls 16, 16 are arranged at both ends in the width direction W on the skin side of the absorbent main body 10 so as to face each other, and extend continuously along the longitudinal direction L. As shown in FIG. Each leak-proof wall 16 includes two leak-proof wall elastic members 61 extending along the longitudinal direction L at the inner end portion in the width direction W. As shown in FIG. The leak-proof wall elastic member 61 is exemplified by thread rubber. In another embodiment, each of the pair of leak-proof walls has an inner end portion in the width direction W folded back further to the outer side in the width direction W. FIG. In another embodiment, there is one or three or more elastic members for the leak-proof wall. Each of the pair of leak-proof walls 16, 16 is made of a hydrophobic sheet such as a hydrophobic non-woven fabric. In another embodiment, it is formed of a hydrophilic sheet, such as a hydrophilic non-woven fabric.

[Leg gather]
In this embodiment, the pants-type diaper 1 is provided with a plurality of leg gather elastic members 8 for leg gathers from the crotch portion 4 to the back portion 3 and the abdomen portion 2 . The plurality of leg gather elastic members 8 extend along the longitudinal direction L mainly at both ends in the width direction W of the crotch portion 4 . The plurality of leg gather elastic members 8 extend and contract a pair of leg openings, respectively, and are exemplified by rubber threads.

[Waist Gather]
In this embodiment, the abdominal part 2 and the back part 3 are provided with a plurality of waist gather elastic members 6a, 6b and a plurality of elastic members 7a, 7b, respectively, between the cover sheet 5a and the cover sheet 5b. . The plurality of elastic members 6a and 6b are arranged outside and inside the abdominal 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 respective predetermined regions on both sides of the longitudinal center line CL. The predetermined region is a region from the end 2a to the inner portion of the edge in the width direction W facing the end 2a of the absorbent body 10 . The plurality of elastic members 6b extend from one end 2a to the other end 2a along the width direction W and are spaced apart from each other in the longitudinal direction L. As shown in FIG. Similarly, the plurality of elastic members 7a, 7b are arranged outside and inside the dorsal 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 respective predetermined regions on both sides of the longitudinal center line CL. The predetermined region is a region from the end 3a to the inner portion of the edge in the width direction W facing the end 3a of the absorbent body 10 . The plurality of elastic members 7b extend from one end 3a to the other end 3a along the width direction W, and are spaced apart from each other in the longitudinal direction L. As shown in FIG. A plurality of elastic members 6a, 6b, 7a, and 7b expand and contract the waist opening, and are exemplified by rubber threads. The abdominal portion (abdominal waist belt) 2 and the dorsal portion (dorsal waist belt) 3 can also be said to be portions defined by the range in the longitudinal direction L where the plurality of elastic members 6a, 6b, 7a, 7b are arranged. .

Next, a method for manufacturing the absorbent body 14 will be described.
First, while moving the sheet for the second base material 46 in the longitudinal direction L, a hot-melt adhesive is applied onto the sheet for the second base material 46 . Next, the superabsorbent polymer is applied from the superabsorbent polymer feeder 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 along the longitudinal direction L. to disperse. At this time, a small amount of the superabsorbent polymer migrates to the region (corresponding to the channel) between the end portions and the central portion. Next, a sheet for the intermediate layer 43 having both sides coated with a hot melt adhesive is laminated on the superabsorbent 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 sheet for the intermediate layer 43 coated with the hot-melt adhesive. Sprinkle along the longitudinal direction L on top. Next, a sheet for the first base material 44 coated with a hot melt adhesive 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 in the width direction W of the sheet for the second base material 46 are folded over both side portions in the width direction W of the sheet for the first base material 44 to obtain a laminate. After that, the thickness of the laminate is adjusted by passing the laminate through a pair of press rolls, that is, by pressing, and the absorber 14 is obtained.

Next, a method of manufacturing an underpants-type diaper using the absorber 14 will be described.
A liquid-permeable surface sheet 12 coated with a skin care agent is attached to the upper surface of the absorbent body 14 (the surface of the first base material 44) produced as described above, and the lower surface of the absorbent body 14 (the second base material 46) is adhered. A liquid-impermeable back sheet 13 is attached to the surface of the substrate) to obtain a laminate. Next, side sheets 17 with leak-proof walls 16 are attached to both sides of the laminate in the width direction W to obtain the absorbent main body 10 . After that, the absorbent body 10 is pasted on the cover sheet 5 (including the elastic members 6, 7, 8), and both ends 2a, 2a in the width direction W of the abdominal portion 2 and the width direction W of the dorsal portion 3 are attached. Both ends 3a, 3a are joined. Thereby, the underpants-type diaper 1 is manufactured.

The pants-type diaper and its absorbent body of the present invention are not limited to the above-described embodiments, but can be combined with each other or applied with known techniques within the scope of the purpose and gist of the present invention. It is possible to

Reference Signs List 1 Pants-type diaper 10 Absorbent main body 12 Topsheet 14 Absorber 18 Skin care agent application part 43 Intermediate layer 44 First base material 45 First water absorbent material 46 Second base material 47 Second water absorbent material 48 Channel 51 Adhesive

Claims (5)

An absorbent article comprising a topsheet, a backsheet, and an absorbent body disposed between the topsheet and the backsheet, and having a longitudinal direction, a width direction, and a thickness direction orthogonal to each other,
The absorbent body includes at least an absorbent core and a core wrap sheet covering at least the non-skin side of the absorbent core,
The absorbent core contains 90% by mass or more of superabsorbent polymer with respect to the total amount of absorbent material,
The superabsorbent polymer is fixed to the core wrap sheet with an adhesive on at least the non-skin side of the absorbent core,
The absorbent core has a low basis weight portion extending along the longitudinal direction and having a low basis weight of the superabsorbent polymer compared to the surrounding area,
A member positioned closer to the skin than the absorbent core has a skin care agent application part on which a skin care agent containing a skin care component is applied,
The skin care agent application portion does not overlap the low basis weight portion in the thickness direction,
Laminated absorbent in which the absorbent core is formed by laminating a first absorbent material containing the superabsorbent polymer, an intermediate layer, and a second absorbent material containing the superabsorbent polymer in this order from the skin side toward the non-skin side. is the core,
The intermediate layer is an air-through nonwoven fabric,
The absorbent article , wherein the intermediate layer has an upper layer and a pair of lower layers adjacent to both sides in the width direction on the non-skin side surface of the upper layer . 2. The absorbent article according to claim 1, wherein said skin-care agent application portion is provided on the skin side of said topsheet. 2. The absorbent article according to claim 1 , wherein the dimensions of said second water absorbent material in said longitudinal direction and said width direction are respectively greater than the maximum dimensions of said first water absorbent material in said longitudinal direction and said width direction. 4. The absorbent article according to claim 3 , wherein said skin care agent application portion overlaps said second absorbent material in said thickness direction. In the second water absorbent material, the basis weight of the superabsorbent polymer in the low basis weight portion is lower than that around the low basis weight portion,
The absorbent according to any one of claims 1 to 4, wherein in the first water absorbent material, the basis weight of the superabsorbent polymer in the low basis weight portion is the same as that around the low basis weight portion. Goods.

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