JP2022031459A - Absorber for absorbent article and absorbent article with the absorber - Google Patents

Abstract

To provide an absorber for an absorbent article having excellent absorbability and less likely to twist.SOLUTION: An absorber 5 for an absorbent article 1 comprises thermoplastic resin fiber and cellulose water-absorbing fiber, and is divided into a first surface layer 13, a second surface layer 17, and an intermediate layer 15 having a fiber density lower than that of them. The absorber 5 is provided with at least one of a constitution (i) in which thermoplastic resin fibers in the first surface layer 13, the intermediate layer 15, and the second surface layer 17 are fused and the ratios of the thermoplastic resin fiber respectively in the first surface layer 13 and the second surface layer 17 are higher than the ratio of the thermoplastic resin fiber in the intermediate layer 15 and a constitution (ii) in which the absorber 5 is adhered using a binder and the ratios of the binder respectively in the first surface layer 13 and the second surface layer 17 are higher than the ratio of the binder in the intermediate layer 15.SELECTED DRAWING: Figure 3

Description

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

Thin absorbent articles and absorbers for the thin absorbent articles are known. For example, Patent Document 1 describes an absorbent article having a liquid-permeable surface layer, an absorption layer located below the surface layer, and a back surface sheet located on the back side of the absorption layer. Has hydrophilic fibers, and at least a part of the fibers are bonded to each other inside the absorption layer, and a plurality of recesses are formed from the surface layer to the absorption layer to form the recesses. An absorbent article (claim 1) is disclosed, wherein the surface layer and the fibers forming the absorbent layer are bonded to each other.

Further, in Patent Document 1, the absorption layer contains hydrophilic fibers and heat-welding synthetic fibers, and the hydrophilic fibers and the synthetic fiber fibers are heat-welded inside the absorption layer. (Claim 3), it is disclosed that the fibers are bonded with an adhesive inside the absorbent layer (Claim 4).

Japanese Patent Application Laid-Open No. 2003-291234

In the absorption layer according to Patent Document 1, since hydrophilic fibers and heat-sealing synthetic fibers are bonded by heat fusion and an adhesive, the rigidity of the entire absorption layer tends to be high.
When the absorbent article is worn, a shearing force in the plane direction may be applied to the absorbent article. In such a case, in the absorbent article according to Patent Document 1, the shearing force is transmitted to the entire absorbent article, and the absorbent article may be twisted or displaced. In addition, peeling may occur between the surface layer and the highly rigid absorption layer, resulting in poor absorbability. Further, the shearing force is transmitted to the back surface sheet, and the back surface sheet may be broken.
Therefore, it is an object of the present disclosure to provide an absorber for an absorbent article which is excellent in absorbability and is not easily twisted.

The present disclosures are an absorber for an absorbent article, wherein the absorber contains a thermoplastic resin fiber and a cellulosic water-absorbent fiber, and the absorber includes a first surface layer and a second surface layer. It is arranged between the surface layer and the first surface layer and the second surface layer, and is divided into an intermediate layer having a fiber density lower than the fiber density in each of the first surface layer and the second surface layer. The absorber has the following structure (i) and structure (ii): structure (i), the first surface layer, the intermediate layer, and the thermoplastic resin fibers in the second surface layer are fused, and the first. The ratio of the thermoplastic resin fibers in each of the surface layer and the second surface layer is higher than the ratio of the thermoplastic resin fibers in the intermediate layer. We have found an absorber characterized in that the ratio of the binder in each of the first surface layer and the second surface layer is higher than the ratio of the binder in the intermediate layer, that is, at least one of them.

Absorbents for absorbent articles have excellent absorbency and are not easily twisted.

FIG. 1 is a diagram for explaining the panty liner 1 according to the first embodiment. FIG. 2 is a diagram for explaining the panty liner 1 according to the first embodiment. FIG. 3 is a diagram for explaining the panty liner 1 according to the first embodiment. FIG. 4 is a diagram for explaining the panty liner 1 according to the first embodiment.

Specifically, the present disclosure relates to the following aspects.
[Aspect 1]
Absorbent for absorbent articles
The absorber contains a thermoplastic resin fiber and a cellulosic water-absorbent fiber.
The absorber is arranged between the first surface layer, the second surface layer, the first surface layer and the second surface layer, and is higher than the fiber density in each of the first surface layer and the second surface layer. It is partitioned into an intermediate layer with a low fiber density and
The absorber has the following configuration (i) and configuration (ii):
Configuration (i) The thermoplastic resin fibers in the first surface layer, the intermediate layer, and the second surface layer are fused, and the ratio of the thermoplastic resin fibers in each of the first surface layer and the second surface layer. Is higher than the ratio of the thermoplastic resin fibers in the intermediate layer,
Configuration (ii) The absorber is adhered by a binder, and the ratio of the binder in each of the first surface layer and the second surface layer is higher than the ratio of the binder in the intermediate layer.
Has at least one of
The above-mentioned absorber.

In the above absorber, each of the first surface layer and the second surface layer has a higher fiber density than the intermediate layer, and when the configuration (i) is satisfied, the first surface layer and the first surface layer are available. When each of the two surface layers has a higher proportion of thermoplastic resin fibers than the intermediate layer and satisfies the configuration (ii), each of the first surface layer and the second surface layer is a binder having a higher ratio than the intermediate layer. Has a ratio. As a result, the rigidity of each of the first surface layer and the second surface layer becomes higher than the rigidity of the intermediate layer, and the rigidity of the intermediate layer becomes lower than the rigidity of each of the first surface layer and the second surface layer. ..

Therefore, when the absorbent article is worn, when a shearing force in a plane direction is applied to the absorbent article (the direction of the force acting on the skin side surface of the absorbent article and the direction of the force acting on the clothing surface of the absorbent article). The absorber is more likely to be destroyed at the intermediate layer, i.e., the intermediate layer can function as a "fragile layer".

When the absorbent article is worn, when a shearing force in the plane direction is applied to the absorbent article, if the intermediate layer is destroyed as a fragile layer, the shearing force is difficult to be transmitted to the entire absorbent article (absorbent article). The force acting on the skin side surface of the absorbent article is less likely to be transmitted to the clothing side surface of the absorbent article, and the force acting on the clothing side surface of the absorbent article is less likely to be transmitted to the skin side surface of the absorbent article). As a result, the absorber, and thus the absorbent article, is less likely to be twisted. Further, since the intermediate layer is destroyed as a fragile layer, the absorption capacity of the absorber increases, and the absorber has excellent absorbency.
From the above, the absorber is less likely to be twisted and has excellent absorbability.

[Aspect 2]
The absorber according to aspect 1, wherein the absorber has a basis weight of 35 to 250 g / m ² and a thickness of 0.3 to 4.0 mm, and is an absorber for a thin absorbent article.

In the thin absorbent article, the shearing force in the plane direction is easily transmitted directly to the absorbent article (the force acting on the skin side surface of the absorbent article is easily transmitted to the clothing side surface of the absorbent article, and the absorbent article is dressed. The force acting on the side surface is easily transmitted to the skin side surface of the absorbent article), and since the number of members is small, it is difficult to absorb the shearing force, so that the absorber and the absorbent article tend to be twisted.
The absorber has a predetermined basis weight and thickness, and is a thin absorber for absorbent articles. As described above, the absorber and the absorbent articles tend to be twisted, but the intermediate layer is fragile. Since it can function as a layer, the absorber is not easily twisted and has excellent absorbability.

[Aspect 3]
The absorber according to aspect 1 or 2, wherein the average fiber length of the thermoplastic resin fiber is longer than the average fiber length of the cellulosic water-absorbent fiber.

In the above absorber, the average fiber length of the thermoplastic resin fiber and the average fiber length of the cellulosic water-absorbent fiber have a predetermined relationship. Therefore, when the configuration (i) is satisfied, the first surface layer and the first surface layer and the first The fusion of the thermoplastic resin fibers in the two surface layers is likely to be more than that in the intermediate layer, and when the configuration (ii) is satisfied, the adhesion of the binder in the first surface layer and the second surface layer is more than that in the intermediate layer. Cheap. As a result, the absorber is less likely to be twisted and has excellent absorbability.

[Aspect 4]
The absorber according to any one of aspects 1 to 3, wherein the fibers constituting the intermediate layer are oriented in a direction along the plane direction of the absorber.

In the absorber, since the fibers constituting the intermediate layer are oriented in the direction along the plane direction of the absorber, the intermediate layer is more likely to function as a fragile layer, and the absorber is less likely to be twisted and absorbable. Excellent for.

[Aspect 5]
The absorber according to any one of aspects 1 to 4, wherein the thermoplastic resin fiber contains a crimpable fiber that is crimped.

In the above absorber, since the thermoplastic resin fiber contains the crimped fiber, the fiber density of the intermediate layer having a relatively low fiber density tends to be further lowered, and the intermediate layer becomes a fragile layer. It will be easier to function. As a result, the absorber is less likely to be twisted and has excellent absorbability.

[Aspect 6]
The absorber according to any one of aspects 1 to 5, wherein the absorber has a fused portion to which the thermoplastic resin fiber is fused at a peripheral portion thereof.

In the above absorber, since the thermoplastic resin fibers are fused at the peripheral edge of the absorber, the intermediate layer functions as a fragile layer when a shearing force in the plane direction is applied to the absorbent article, and the absorber functions as a fragile layer. However, even when the first surface layer side portion including the first surface layer and the second surface layer side portion including the second surface layer are separated, the separation is difficult to reach the peripheral portion of the absorber. Become.
As a result, the absorption capacity of the absorber is less likely to decrease, and the absorber is excellent in absorbency.

[Aspect 7]
The absorber according to any one of aspects 1 to 6, wherein the absorber comprises a superabsorbent polymer in the intermediate layer.

Since the absorber has a superabsorbent polymer in the intermediate layer, the superabsorbent polymer swells when the absorber absorbs the body fluid, so that the intermediate layer more easily functions as a fragile layer. As a result, the absorber is less likely to be twisted and has excellent absorbability.

[Aspect 8]
The absorber according to any one of aspects 1 to 7, wherein the absorber has the configuration (ii) and the binder is a hydrophilic binder.

In the above absorber, since the binder is a hydrophilic binder, the hydrophilic binder can easily adhere the cellulosic water-absorbent fiber, and the rigidity of the first surface layer and the second surface layer can be increased, and the intermediate layer can be formed. Becomes easier to function as a vulnerable layer. As a result, the absorber is less likely to be twisted and has excellent absorbability.

[Aspect 9]
An absorbent article comprising a liquid permeable sheet, a liquid impermeable sheet, and an absorber disposed between them.
The absorber is the absorber according to any one of aspects 1 to 8.
The first surface layer is bonded to the liquid permeable sheet, and the second surface layer is bonded to the liquid permeable sheet.
The above-mentioned absorbent article.

In the absorbent article, the intermediate layer of the absorber can function as a fragile layer when a shearing force in the plane direction is applied to the absorbent article. As a result, when the absorbent article is worn, when a shearing force in the plane direction is applied to the absorbent article, the intermediate layer is destroyed as a fragile layer, and the shearing force is less likely to be transmitted to the entire absorbent article (absorbency). The force acting on the skin side surface of the article is less likely to be transmitted to the clothing side surface of the absorbent article, and the force acting on the clothing side surface of the absorbent article is less likely to be transmitted to the clothing side surface of the absorbent article). As a result, the absorber, and thus the absorbent article, is less likely to be twisted.

Further, in the above-mentioned absorbent article, since the first surface layer is bonded to the liquid permeable sheet, after the intermediate layer is destroyed as a fragile layer, the portion on the first surface layer side including the first surface layer is liquid. It can move in conjunction with the permeable sheet, and the body fluid that has reached the liquid permeable sheet can be transferred to the first surface layer side portion of the absorber. Further, since the portion on the first surface layer side can move in conjunction with the liquid permeable sheet, the liquid permeable sheet is less likely to break when a shearing force in the plane direction is applied to the absorbent article.

Further, in the above-mentioned absorbent article, since the second surface layer is bonded to the liquid impermeable sheet, after the intermediate layer is destroyed as a fragile layer, the portion on the side of the second surface layer including the second surface layer is formed. It can move in conjunction with the liquid-impermeable sheet, making it difficult for the liquid-impermeable sheet to break.
Further, after the intermediate layer is destroyed as a fragile layer, the absorber can be separated into a first surface layer side portion and a second surface layer side portion, and the body fluid can be retained between them, so that the absorber can be absorbed. The absorption capacity of the body increases, and the absorber has excellent absorbability.
From the above, the absorbent article is less likely to be twisted and has excellent absorbency.

[Aspect 10]
The absorbent article according to aspect 9, wherein the bonding strength of the first surface layer and the liquid permeable sheet is different from the bonding strength of the second surface layer and the liquid permeable sheet.

In the absorbent article, the bonding strength of the first surface layer and the liquid permeable sheet and the bonding strength of the second surface layer and the liquid permeable sheet have a predetermined relationship.
When the bonding strength of the first surface layer and the liquid permeable sheet is higher than the bonding strength of the second surface layer and the liquid permeable sheet, the first surface layer is twisted even when the absorbent article is twisted. The liquid-permeable sheet is less likely to come off, and the absorbent article has excellent absorbency.

When the bonding strength of the second surface layer and the liquid permeable sheet is higher than the bonding strength of the first surface layer and the liquid permeable sheet, the second surface layer is twisted even when the absorbent article is twisted. In addition, the liquid impermeable sheet is less likely to come off, and the liquid impermeable sheet is less likely to tear.

[Aspect 11]
The absorbent article according to aspect 9 or 10, wherein the fiber density of the first surface layer is higher than the fiber density of the second surface layer.

In the above-mentioned absorbent article, the fiber density of the first surface layer is higher than the fiber density of the second surface layer, so that the bonding force between the first surface layer and the liquid permeable sheet is the second surface layer and the liquid impermeable. It tends to be higher than the bonding force of the sheet, and even when the absorbent article is twisted, the bonding between the first surface layer and the liquid permeable sheet is difficult to come off, and the absorbent article is excellent in absorbability.

[Aspect 12]
The absorbent article according to aspect 9 or 10, wherein the fiber density of the second surface layer is higher than the fiber density of the first surface layer.

In the above-mentioned absorbent article, the fiber density of the second surface layer is higher than the fiber density of the first surface layer, so that the bonding force between the second surface layer and the liquid impermeable sheet is the first surface layer and the liquid permeability. It tends to be higher than the bonding force of the sheet, and even when the absorbent article is twisted, the bonding between the second surface layer and the liquid-impermeable sheet is difficult to come off, and the liquid-impermeable sheet is difficult to tear.
Further, in the absorbent article, since the fiber density of the first surface layer is lower than the fiber density of the second surface layer, the body fluid of the first surface layer moves from the liquid permeable sheet to the second surface layer side. It becomes difficult to prevent that.

[Aspect 13]
Aspects 9-12, wherein the absorber has the configuration (ii), the binder present in the first surface layer is a hydrophilic binder, and the binder present in the second surface layer is a hydrophobic binder. The absorbent article according to any one.

In the above-mentioned absorber, since the binder in the first surface layer and the binder in the second surface layer have a predetermined relationship, the body fluid moves from the liquid permeable sheet to the second surface layer side in the first surface layer. It becomes difficult to prevent that. As a result, the absorbent article is excellent in absorbability.

[Aspect 14]
Aspects 9 to 13, wherein the absorber has the configuration (ii), the binder present in the first surface layer is a hydrophobic binder, and the binder present in the second surface layer is a hydrophilic binder. The absorbent article according to any one.

In the above-mentioned absorber, since the binder in the first surface layer and the binder in the second surface layer have a predetermined relationship, it becomes easier to hold the body fluid on the second surface layer side and on the first surface layer side. It becomes difficult to return. As a result, the absorbent article has excellent return resistance.

[Aspect 15]
The absorbent article is provided with a round seal portion that seals the liquid permeable sheet and the liquid impermeable sheet on the peripheral edge portion of the absorbent article, and the absorbent body is the round seal. The absorbent article according to any one of aspects 9 to 14, which is arranged inside the portion.

In the absorbent article, the absorber is arranged inside the round seal portion. Therefore, even when a shearing force in the plane direction is applied to the absorbent article, the intermediate layer functions as a fragile layer, and the absorber is separated into a first surface layer side portion and a second surface layer side portion. , The separation is less likely to affect the round seal portion, and the round seal portion is less likely to be separated in the thickness direction.
As a result, the absorbent article is excellent in absorbability.

[Aspect 16]
The item according to any one of aspects 9 to 15, wherein the liquid permeable sheet is made of a non-woven fabric containing cotton fibers, and the cotton fibers and the thermoplastic resin fibers of the first surface layer are entangled with each other. Absorbent article.

In the absorbent article, the liquid permeable sheet is composed of a non-woven fabric containing cotton fibers. A liquid permeable sheet made of a non-woven fabric containing cotton fibers is preferable from the viewpoint of touch and the like.
On the other hand, in the non-woven fabric containing cotton fibers, the strength of the non-woven fabric tends to be weakened due to the bias of the cotton fibers, the non-fusing property of the cotton fibers, the water-absorbing fibers of the cotton fibers, and the like, and the strength of the non-woven fabric. As a result of weakening, the absorbent article may be easily twisted when the absorbent article is used.
In the absorbent article, since the cotton fibers constituting the nonwoven fabric are entangled with the thermoplastic resin fiber of the first surface layer, the strength of the nonwoven fabric is less likely to be weakened, and the absorbent article is less likely to be twisted.

[Aspect 17]
The item according to any one of aspects 9 to 16, wherein the liquid permeable sheet is made of a non-woven fabric, and the fiber orientation of the fibers constituting the liquid permeable sheet is different from the fiber orientation of the first surface layer. The absorbent article described.

In the above-mentioned absorbent article, since the fiber orientation of the fibers constituting the liquid permeable sheet and the fiber orientation of the first surface layer have a predetermined relationship, the liquid permeable sheet and the absorber are separated from each other. Friction increases, and when the absorbent article is used, the liquid permeable sheet and the absorber are less likely to be displaced, and the absorbent article is less likely to be twisted.

[Aspect 18]
Absorbent for absorbent articles
The absorber contains a thermoplastic resin fiber and a cellulosic water-absorbent fiber.
The absorber is partitioned into a first surface layer, a second surface layer, and an intermediate layer between them.
When the absorber is subjected to a shearing force in a plane direction, the absorber breaks at the intermediate layer, and the first surface layer side portion including the first surface layer and the second surface layer. It is configured to be at least partially separated from the second surface layer side portion containing.
The above-mentioned absorber.

The absorber has the same effect as that of the absorber according to the first aspect.

The absorbent body for the absorbent article of the present disclosure and the absorbent article provided with the absorbent body will be described in detail below.
1 to 4 are diagrams for explaining an absorbent article according to one of the embodiments of the present disclosure (hereinafter, referred to as a first embodiment), specifically, a panty liner 1. Specifically, FIG. 1 is a plan view of the panty liner 1. FIG. 2 is a plan view of the absorber 5. FIG. 3 is an end view of the end face III-III of FIG. FIG. 4 is a diagram for explaining a state in use of the panty liner 1, and corresponds to an end view on the end face of III-III in FIG. 3 and 4 are schematic views for the purpose of understanding the present disclosure.

The panty liner 1 according to the first embodiment includes a liquid permeable sheet 3, a liquid impermeable sheet 7, and an absorber 5 between them. The absorber 5 is partitioned from the liquid permeable sheet 3 toward the liquid permeable sheet 7 into a first surface layer 13, a second surface layer 17, and an intermediate layer 15 between them. The absorber 5, specifically, the first surface layer 13, the second surface layer 17, and the intermediate layer 15, respectively, are a thermoplastic resin fiber (not shown) and a cellulosic water-absorbing fiber (not shown). And include.

The first surface layer 13 is bonded to the liquid permeable sheet 3 via a first adhesive portion 31 made of a hot melt adhesive. Further, the second surface layer 17 is bonded to the liquid impermeable sheet 7 via a second adhesive portion 33 made of a hot melt adhesive.

In the absorber 5, the fiber density (not shown) in each of the first surface layer 13 and the second surface layer 17 is higher than the fiber density (not shown) in the intermediate layer 15. Further, the absorber 5 has both the following configuration (i) and configuration (ii).
Configuration (i): The thermoplastic resin fibers in the first surface layer 13, the second surface layer 17 and the intermediate layer 15 are fused, and the thermoplastic resin in each of the first surface layer 13 and the second surface layer 17 is fused. The ratio of fibers is higher than the ratio of thermoplastic resin fibers in the intermediate layer 15.

Configuration (ii): The absorber 5 is adhered by a binder, and the ratio of the binder in each of the first surface layer 13 and the second surface layer 17 is higher than the ratio of the binder in the intermediate layer 15.
Since the absorber 5 has both the configuration (i) and the configuration (ii), the intermediate layer 15 easily functions as a fragile layer, and the absorber 5 and thus the panty liner 1 are less likely to be twisted and become absorbent. Excellent.

When the panty liner 1 is worn, a shearing force in the plane direction is applied to the panty liner 1 (the direction of the force acting on the skin side surface (not shown) of the panty liner 1 and the clothing surface of the panty liner 1 (not shown). (The direction of the acting force is relatively different), the absorber 5 is more likely to be destroyed at the intermediate layer 15, that is, the intermediate layer 15 can function as a "fragile layer".

As a result, when the panty liner 1 is worn and a shearing force in the plane direction is applied to the panty liner 1, the intermediate layer 15 is destroyed as a fragile layer, and the shearing force is less likely to be transmitted to the entire panty liner 1 (panty liner 1). The force acting on the skin side surface of 1 is less likely to be transmitted to the clothing side surface of the panty liner 1, and the force acting on the clothing side surface of the panty liner 1 is less likely to be transmitted to the clothing side surface of the panty liner 1.). As a result, the absorber 5 and the panty liner 1 are less likely to be twisted.

Further, as shown in FIG. 4, when the intermediate layer 15 is destroyed as a fragile layer, the absorber 5 includes a first surface layer side portion 35 including the first surface layer 13 and a second surface layer 17. The absorption capacity of the absorber 5 is separated into the second surface layer side portion 37 so that the body fluid can be held between the first surface layer side portion 35 and the second surface layer side portion 37. The number of absorbers 5 and the panty liner 1 will be excellent.

The panty liner 1 is provided with a round seal portion 11 that seals the liquid permeable sheet 3 and the liquid impermeable sheet 7 on the liner peripheral edge portion 9, which is the peripheral edge portion of the panty liner 1. Further, the edge of the absorber 5 does not reach the round seal portion 11, and the absorber 5 is arranged inside the round seal portion 11. As a result, even when the absorber 5 is separated into the first surface layer side portion 35 and the second surface layer side portion 37, the separation is less likely to affect the round seal portion 11, and the round seal The portion 11 becomes difficult to separate in the thickness direction. As a result, the absorber 5 and thus the panty liner 1 are excellent in absorbency.

The absorber 5 includes a fused portion 21 to which the thermoplastic resin fiber is fused at the absorber peripheral portion 19 which is a peripheral portion of the absorber 5. As a result, even when the intermediate layer 15 functions as a fragile layer and the absorber 5 is separated into the first surface layer side portion 35 and the second surface layer side portion 37, the separation is the absorber 5. It becomes difficult to reach the peripheral portion 19 of the absorber. As a result, the absorption capacity of the absorber 5 is less likely to decrease, and the absorber 5 and thus the panty liner 1 are excellent in absorbency.

Hereinafter, the structure that can be taken by the absorbent body according to the present disclosure and the absorbent article provided with the absorbent body will be described.
[Absorber]
The absorber according to the present disclosure includes a thermoplastic resin fiber and a cellulosic water-absorbent fiber. The thermoplastic resin fiber contributes to suppressing the twisting of the absorber, and the cellulosic fiber contributes to absorbing and retaining the body fluid.

The thermoplastic resin fiber is not particularly limited as long as it can be heat-fused, and for example, a fiber containing a single component, for example, a single fiber, or a fiber containing a plurality of components, for example, a composite fiber. Can be mentioned. Examples of the above components include polyethylene, polypropylene, polybutylene, polyester, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, and polyolefins such as ionomer resin; polyethylene terephthalate (PET). , Polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polyesters such as polylactic acid; polyamides such as nylon and the like.

Examples of the above-mentioned composite fibers include composite fibers such as core-sheath type fibers, side-by-side type fibers, island / sea type fibers; hollow fibers; atypical fibers such as flat, Y-type, and C-type; latent crimped or manifested. Three-dimensional crimped crimped fibers; split fibers that are split by physical load such as water flow, heat, embossing, etc., and industrially inexpensive and highly safe core-sheath type fibers, particularly PET / PE, PP / PE (core / sheath) and the like are preferable.

The mass ratio of the core component / sheath component is preferably 10/90 to 90/10, and more preferably 30/70 to 70/30. When the proportion of the sheath component is small, the fusion property tends to decrease, and when the proportion of the sheath component increases, the spinnability tends to decrease.

The thermoplastic resin fiber preferably contains a crimpable fiber that is crimped. As a result, it becomes easier to further reduce the fiber density of the intermediate layer having a relatively low fiber density, and it becomes easier to make the intermediate layer function as a fragile layer.

The thermoplastic resin fibers preferably have an average fiber length of 6 to 70 mm, more preferably 10 to 50 mm, and even more preferably 15 to 40 mm. When the average fiber length is less than 6 mm, the thermoplastic resin fiber tends to be less likely to be entangled with other thermoplastic resin fibers and / or cellulosic water-absorbent fibers.

Further, when the average fiber length exceeds 70 mm, the spreadability of the thermoplastic resin fiber is remarkably lowered, and the absorber contains the thermoplastic resin fiber in which the fiber has not been opened, and the uniformity of the absorber is lowered. Tend to do.
The average fiber length is particularly preferable when the absorber is mixed with a cellulosic water-absorbent fiber, for example, a pulp fiber by an air-laid method.

In the absorber, the thermoplastic resin fiber preferably has a fineness of 0.5-10 dtex, more preferably 1.5-5 dtex. If the fineness is less than 0.5 dtex, the openness of the thermoplastic resin fiber may decrease, and if the fineness exceeds 10 dtex, the number of thermoplastic resin fibers is reduced, and other thermoplastic resins are used. The number of points entangled with the fiber and / or the cellulosic water-absorbent fiber tends to decrease.

Examples of the cellulose-based water-absorbent fiber include non-wood such as pulp fiber, for example, wood pulp fiber obtained from coniferous tree or broadleaf tree, bagus fiber, kenaf fiber, bamboo fiber, hemp fiber, and cotton fiber (for example, cotton linter). Examples thereof include pulp fibers; regenerated cellulose fibers such as rayon fibers; semi-synthetic fibers such as acetate fibers. As the pulp fiber, kraft pulp fiber which can be obtained industrially at low cost and has high safety is preferable.

The average fiber length of the cellulosic water-absorbent fiber is not particularly limited. When the cellulosic water-absorbent fiber is a regenerated cellulose fiber, a semi-synthetic fiber or the like, it can have an average fiber length of 3 to 70 mm, 5 to 50 mm, 10 to 40 mm or the like. Depending on the fiber length, the regenerated cellulose fiber, the semi-synthetic fiber, and the like have the same function as the thermoplastic resin fiber when dried, and can impart resistance to the absorber.

The absorber according to the present disclosure is preferably a thermoplastic resin fiber and a cellulosic water-absorbent fiber based on a total of 100 parts by mass of the thermoplastic resin fiber and the cellulosic water-absorbent fiber, preferably 5 to 50:95 to 50. , And more preferably in a mass ratio of 10-20: 90-80. This is from the viewpoint of the resistance of the absorber and the absorbency.

The absorber according to the present disclosure is partitioned into a first surface layer, a second surface layer, and an intermediate layer between them. The first surface layer may constitute the skin side surface and may form the clothing side surface. In addition, the second surface layer may form the side surface of clothing and may form the side surface of the skin.

The fiber density in each of the first surface layer and the second surface layer is configured to be higher than the fiber density in the intermediate layer. This makes it easier for the middle layer to function as a vulnerable layer.
The fiber density of the first surface layer and the fiber density of the second surface layer can be the same or different, for example, the fiber density of the first surface layer can be higher than the fiber density of the second surface layer. , And the fiber density of the second surface layer can be higher than the fiber density of the first surface layer.
The high or low fiber density can be determined by observing the cross section of the absorber with a microscope or the like.

The absorber of the present disclosure comprises at least one of the following configurations (i) and (ii), preferably both configuration (i) and configuration (ii).
Configuration (i): The thermoplastic resin fibers in the first surface layer, the second surface layer, and the intermediate layer are fused, and the ratio of the thermoplastic resin fibers in each of the first surface layer and the second surface layer is Higher than the proportion of thermoplastic resin fibers in the intermediate layer.
Configuration (ii): The absorber is adhered by the binder, and the ratio of the binder in each of the first surface layer and the second surface layer is higher than the ratio of the binder in the intermediate layer. This makes it easier for the middle layer to function as a vulnerable layer.

The high / low ratio of the thermoplastic resin fiber and the high / low ratio of the binder can be determined by observing the cross section of the absorber with a microscope or the like.
Examples of the fusion of the thermoplastic resin fibers include fusion between the thermoplastic resin fibers and fusion between the thermoplastic resin fibers and the cellulose-based water-absorbent fibers.
Examples of the adhesion by the binder include adhesion between thermoplastic resin fibers by a binder, adhesion between thermoplastic resin fibers and cellulose-based water-absorbent fibers by a binder, adhesion between cellulose-based water-absorbent fibers by a binder, and the like.

As the binder, those used in the art can be used without particular limitation, and examples thereof include a hydrophilic binder and a hydrophobic binder.
For example, when the binder is a hydrophilic binder, the hydrophilic binder can easily adhere the cellulosic water-absorbent fiber, the rigidity of the first surface layer and the second surface layer can be increased, and the intermediate layer is fragile. It becomes easier to function as a layer.

The binder can be, for example, an adhesive, for example, an emulsion type adhesive, a hot melt type adhesive, or the like.
Examples of the emulsion type adhesive include an oil drop type emulsion type adhesive in water and a water drop type emulsion type adhesive in oil, and an oil drop type emulsion type adhesive in water is preferable from the viewpoint of environmental protection.

The emulsion type adhesive is not particularly limited, and is, for example, an acrylic emulsion, a vinyl acetate emulsion, a vinyl chloride / vinyl acetate copolymer emulsion, a styrene / butadiene copolymer emulsion, an ethylene / vinyl acetate copolymer emulsion, or a polyester emulsion. Emulsions, polyurethane emulsions, polyolefin emulsions and the like can be mentioned, and acrylic emulsions are preferable from the viewpoint of easy control of viscosity and adhesive strength.

The emulsion-type adhesive is preferably neutralized with an amino alcohol. From the point of view of odor. The amino alcohol is not particularly limited as long as it has an amino group and a hydroxyl group, and examples thereof include compounds in which the hydrogen group of the hydrocarbon moiety is substituted with an amino group and a hydroxyl group. , 2-Amino-2-methyl-1-propanol, N-methylethanolamine, N-methyldiethanolamine and the like.

The hot melt type adhesive is not particularly limited, and is, for example, a polyolefin (for example, polyethylene and polypropylene) type hot melt type adhesive, an ethylene / vinyl acetate copolymer type hot melt type adhesive, and a synthetic rubber (for example, styrene type). Examples thereof include copolymers, butadiene-based copolymers, isoprene-based copolymers) -based hot-melt adhesives, acrylic-based hot-melt adhesives, polyvinyl alcohol-based hot-melt adhesives, and the like.

In the absorber of the present disclosure, it is preferable that the average fiber length of the thermoplastic resin fiber is longer than the average fiber length of the cellulosic water-absorbent fiber. As a result, when the configuration (i) is satisfied, the fusion of the thermoplastic resin fibers in the first surface layer and the second surface layer tends to be larger than that in the intermediate layer, and when the configuration (ii) is satisfied, the first Adhesion of the binder in the first surface layer and the second surface layer tends to be more than that in the intermediate layer, and the intermediate layer tends to function more easily as a fragile layer.

In the present disclosure, among the thermoplastic resin fibers and the cellulosic water-absorbent fibers, those other than the pulp fibers, for example, the average fiber lengths of the regenerated cellulose fibers and the semi-synthetic fibers are described in Annex A of JIS L 1015: 2010. Measure according to "A7.1.1 Method A (standard method) Method of measuring the length of individual fibers on a glass plate with a scale" in "A7.1 Measurement of fiber length".
The above method is a test method equivalent to ISO 6989 published in 1981.

In the present disclosure, the average fiber length of pulp fiber means the weight-weighted average fiber length, and Kajaani Fiber Lab Fiber Properties (offline) manufactured by metso automation [kajaaniFiberLab fiber developers (off-line)]. Means the L (w) value measured by.

In the absorber according to the present disclosure, it is preferable that the fibers constituting the intermediate layer are oriented in the direction along the plane direction of the absorber. This makes it easier for the middle layer to function as a vulnerable layer.
The direction along the plane direction of the absorber means that the orientation angle described later is less than ± 45 ° from the plane direction.

The fiber orientation is a concept including the orientation angle and the orientation strength of the fibers, and can be measured by, for example, the following method.
(1) The sample is allowed to stand with the measurement surface of the sample (for example, the cross section of the absorber, the surface of the first surface layer, the non-skin side surface of the liquid permeable sheet, etc.) facing up.
(2) Using a microscope (for example, a scanning electron microscope such as JCM-5100 manufactured by JEOL Ltd.), a magnified image from a direction perpendicular to the measurement surface of the sample is taken, printed, and printed. Trace the fibers on the transparent PET sheet. The magnified image is an image magnified to a magnification capable of measuring 10 or more fibers, and the magnified image is, for example, 50 to 300 times.

(3) The image is taken into a personal computer, and the image is binarized by using the nexus New Qube (stand-alone version) image processing software manufactured by Nexus Co., Ltd.
(4) Using the Fiber Orientation Analysis 8.13 Single, which is a fiber orientation analysis program, the orientation angle and the orientation strength are obtained from the binarized images. The orientation angle is the angle at which the fibers are most oriented, and the orientation strength is the strength at the orientation angle.
The larger the orientation strength, the more the fibers are oriented. When the orientation strength is 1.05 or more, it is assumed that the orientation is performed. The measurement is repeated several times (for example, 3 to 5 times), and the average value is calculated.
In terms of fiber orientation, pulp fibers are excluded from the measurement because of their short average fiber length.

The absorber is preferably a thin absorbent body for absorbent articles. As a result, the thin absorbent article tends to be twisted easily, but by adopting the absorbent body, it can be made difficult to twist. From this point of view, the absorber preferably has a thickness of 0.3 to 4.0 mm, more preferably 0.5 to 3.5 mm, and even more preferably 0.8 to 3.0 mm. From this point of view, the absorber preferably has a basis weight of 35 to 250 g / m ² , more preferably 35 to 200 g / m ² , and even more preferably 40 to 180 g / m ² .

In the present disclosure, the thickness (mm) of the absorber is measured as follows.
Prepare FS-60DS [measurement surface 44 mm (diameter), measurement pressure 3 g / cm ² ] manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd. and absorb under standard conditions (temperature 23 ± 2 ° C, relative humidity 50 ± 5%). Five different parts of the body are pressurized, the thickness of each part after 10 seconds of pressurization is measured, and the average value of the five measured values is taken as the thickness of the absorber.
Further, in the present disclosure, the basis weight of the absorber is measured according to "6.2 Mass per unit area (ISO method)" of JIS L 1913: 2010.

The absorber preferably has a superabsorbent polymer in the intermediate layer. As a result, when the absorber absorbs the body fluid, the superabsorbent polymer swells, which makes it easier for the intermediate layer to function as a fragile layer.
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, a crosslinked product of sodium carboxymethyl cellulose, and the like, and synthetic polymers. Examples of the superabsorbent polymer of the system include polyacrylate-based, polysulfonate-based, anhydrous maleate-based, polyacrylamide-based, polyvinyl alcohol-based, polyethylene oxide-based, polyasparaginate-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. ..

The absorber may or may not have a fused portion in which the thermoplastic resin fiber is fused at the peripheral portion of the absorber, and the absorber shall have a fused portion. Is preferable. As a result, when a shearing force in the plane direction is applied to the absorbent article, the intermediate layer functions as a fragile layer, and the absorber forms the first surface layer side portion including the first surface layer and the second surface layer. Even when it is separated from the second surface layer side portion including the second surface layer, it becomes difficult for the separation to reach the peripheral portion of the absorber.

It is preferable that the peripheral portion is thinner than the portion other than the peripheral portion of the absorber (for example, the central portion of the absorber). As a result, the fiber density of the peripheral portion becomes higher than the fiber density of the portion other than the peripheral portion of the absorber, and in the case of the configuration (i), the absolute amount of the fiber fused to the thermoplastic resin fiber is Higher, and in the case of configuration (ii), higher absolute amount of fibers bonded by the binder. As a result, the rigidity of the thin peripheral edge portion is higher than the rigidity of the portion other than the thick peripheral edge portion, and the absorber has the first surface layer side portion including the first surface layer and the second surface. Even when separated from the second surface layer side portion including the layer, the separation becomes difficult to reach the peripheral portion of the absorber.

Further, in the absorber according to the present disclosure, when a shearing force in the plane direction is applied to the absorber, the absorber breaks in the intermediate layer, and the first surface layer side portion including the first surface layer and the first surface layer side portion. It can be configured to be at least partially separated from the second surface layer side portion including the second surface layer. As a result, the intermediate layer can function more as a fragile layer, and the absorber is less likely to be twisted and has excellent absorbability.

The absorber according to the present disclosure can be produced by a method generally used in the art, and can be produced, for example, as follows.
(1) A first surface web corresponding to the first surface layer, an intermediate web corresponding to the intermediate layer, and a second surface web corresponding to the second surface layer are prepared.
(2) The second surface web, the intermediate web, and the first surface web are laminated in this order to form a laminated web, and a) the laminated web is heated to fuse the thermoplastic resin fibers, and / or b. ) Apply the binder from the first surface web side and the second surface web side.

In order to make the fiber densities of the first surface layer and the second surface layer higher than the fiber densities of the intermediate layer, for example, the first surface web and the second surface web are passed between a pair of rollers, and the first surface web and the first surface web are passed. The density of each of the second surface webs may be higher than that of the intermediate webs.

In order to achieve the configuration (i), for example, the ratio of the thermoplastic resin fibers in each of the first surface web and the second surface web (ratio to the total fibers) is set, and the ratio of the thermoplastic resin fibers in the intermediate web (total). The ratio to the fiber) should be higher than that.

In order to achieve the configuration (ii), for example, after pre-coating the first surface web and the second surface web with a binder, from both sides of the first surface web side and the second surface web side of the laminated web. The binder may be applied from both sides of the first surface web side and the second surface web side of the laminated web with a weak pressure so as not to reach the intermediate layer too much.
By changing the polarity (hydrophilicity, hydrophobicity) of the binder to be applied from the first surface web side and the second surface web side, the polarity of the binder existing in each of the first surface layer and the second surface layer can be changed. (Hydrophilic, hydrophobic) can be changed.

The fused portion that can be formed on the peripheral portion of the absorber can be formed, for example, by heating the peripheral portion of the absorber and fusing the thermoplastic resin fibers contained in the absorber.
The absorber according to the present disclosure preferably does not have a squeezing portion for squeezing the absorber. This is from the viewpoint of making the middle layer function as a vulnerable layer.

[Absorbable article]
The absorbent article according to the present disclosure includes a liquid permeable sheet, a liquid permeable sheet, and an absorber between them.
The absorbent article is not particularly limited, and examples thereof include disposable diapers, disposable shorts, sanitary napkins, panty liners, urine absorbing pads, and the like.
The absorbent article is preferably a thin absorbent article from the viewpoint of suppressing the kinking of the absorbent article, and the thin absorbent article includes, for example, a sanitary napkin, a panty liner, or the like. Listed, and preferably a panty liner.

The absorbent article is preferably a thin absorbent article and preferably has an adhesive portion for fixing to clothes.
When the absorber is composed of two layers (for example, a first surface layer and a second surface layer) that are not bonded to each other, the rigidity of the absorber is lowered, and a thin absorbent article is peeled off. When the adhesive portion is peeled off from the cloth and fixed to the clothes, the thin absorbent article is twisted, which is inferior in wearing feeling and tends to cause leakage or the like. Even with such a thin absorbent article, the absorbent article according to the present disclosure can suppress twisting when worn, and as a result, is excellent in wearing feeling, leakage and the like.

As the liquid permeable sheet and the liquid impermeable sheet, those used in the art can be adopted. Examples of the liquid-permeable sheet include sheet-like materials having a structure that allows liquid to permeate, such as films, woven fabrics, and non-woven fabrics. Examples of the fibers constituting the woven fabric and the non-woven fabric include natural fibers and chemical fibers, examples of the natural fibers include cellulose-based fibers such as crushed pulp fibers and cotton fibers, and examples of the chemical fibers include rayon. , Regenerated cellulose such as fibril rayon, semi-synthetic cellulose such as acetate and triacetate, thermoplastic hydrophobic chemical fiber, and thermoplastic hydrophobic chemical fiber subjected to hydrophilization treatment.

Examples of the above-mentioned non-woven fabric include, for example, air-through non-woven fabric, spunbond non-woven fabric, point-bond non-woven fabric, spunlace non-woven fabric, needle punch non-woven fabric, melt-blown non-woven fabric, and a combination thereof (for example, SMS).

The liquid impermeable sheet includes a film containing PE, PP, etc., a breathable resin film, a non-woven fabric such as spunbond or spunlace bonded with a breathable resin film, and a multi-layered non-woven fabric such as SMS. And so on.

The first surface layer of the absorber is bonded to the liquid permeable sheet, and the second surface layer of the absorber is bonded to the liquid permeable sheet.
Examples of the bonding between the first surface layer and the liquid permeable sheet and the bonding between the second surface layer and the liquid permeable sheet include bonding used in the art, for example, bonding with a hot melt adhesive.

The bonding strength of the first surface layer and the liquid permeable sheet and the bonding strength of the second surface layer and the liquid permeable sheet can be the same or different. For example, when the bonding strength of the first surface layer and the liquid permeable sheet is higher than the bonding strength of the second surface layer and the liquid permeable sheet, even if the absorbent article is twisted, the first The bond between the surface layer and the liquid permeable sheet is less likely to come off, and the absorbent article has excellent absorbency. Further, when the bonding strength of the second surface layer and the liquid permeable sheet is higher than the bonding strength of the first surface layer and the liquid permeable sheet, the second surface layer and the liquid permeable sheet are second even if the absorbent article is twisted. The bond between the surface layer and the liquid-impermeable sheet is less likely to come off, and the liquid-impermeable sheet is less likely to tear.

The bonding strength of the first surface layer and the liquid permeable sheet and the bonding strength of the second surface layer and the liquid permeable sheet are, for example, a hot melt adhesive for adhering the first surface layer and the liquid permeable sheet. It can be changed by changing the type of the hot melt adhesive for adhering the second surface layer and the liquid impermeable sheet.

When the fiber density of the first surface layer of the absorber is higher than the fiber density of the second surface layer of the absorber, the bonding force between the first surface layer and the liquid permeable sheet becomes the second surface layer and the liquid impermeable. The bonding strength tends to be higher than that of the permeable sheet, and even when the absorbent article is twisted, the bond between the first surface layer and the liquid permeable sheet is less likely to come off, and the absorbent article is excellent in absorbability. When the fiber density of the second surface layer of the absorber is higher than the fiber density of the first surface layer of the absorber, the bonding force between the second surface layer and the liquid impermeable sheet becomes the first surface layer and the liquid. It tends to be higher than the bonding force of the permeable sheet, and even if the absorbent article is twisted, the bonding between the second surface layer and the liquid permeable sheet is difficult to come off, and the liquid permeable sheet is difficult to tear. ..

In the above-mentioned absorbent article, the binder in the first surface layer of the absorber is a hydrophilic binder, and the binder in the second surface layer of the absorber is a hydrophobic binder, whereby the body fluid is permeable to the first surface layer. It becomes difficult to prevent the movement from the sheet to the second surface layer side.
Further, in the above-mentioned absorbent article, the binder in the first surface layer of the absorber is used as a hydrophobic binder, and the binder in the second surface layer of the absorber is used as a hydrophilic binder, so that the body fluid is transferred to the second surface layer side. It becomes easy to hold and it becomes difficult to return to the first surface layer side.

The absorbent article may be provided with at least a liquid permeable sheet and a round seal portion sealing the liquid permeable sheet on the peripheral edge portion of the absorbent article. Even if the round seal portion is made by fusing the materials constituting the liquid permeable sheet and the liquid permeable sheet, the liquid permeable sheet, the liquid permeable sheet, etc. can be formed by using a binder and a hot melt adhesive. May be adhered.

When the absorbent article includes the round seal portion, the absorber has reached or has not reached the round seal portion (that is, the absorber is inside the round seal portion). It can be located in), but it is preferable that it has not been reached. Even when a shearing force in the plane direction is applied to the absorbent article, the intermediate layer functions as a fragile layer, and the absorber is separated into a first surface layer side portion and a second surface layer side portion. Separation is less likely to affect the round seal portion, and the round seal portion is less likely to be separated in the thickness direction.

When the absorber reaches the round seal portion, for example, the fused portion of the absorber may be integrally formed with the round seal portion of the absorbent article. For example, the liquid permeable sheet, the absorbent body and the liquid permeable sheet are collectively cut into the shape of an absorbent article, and the peripheral portions of the liquid permeable sheet, the absorbent body and the liquid permeable sheet are fused. The round seal portion of the absorbent article and the fused portion of the absorber can be integrally formed.

When the liquid-permeable sheet is made of a non-woven fabric containing cotton, it is preferable that the cotton fibers and the thermoplastic resin fibers of the first surface layer are entangled with each other. As a result, the strength of the non-woven fabric is less likely to be weakened, and the absorbent article is less likely to be twisted.

When the liquid permeable sheet is made of a non-woven fabric, the fiber orientation of the fibers constituting the liquid permeable sheet may be the same as the fiber orientation of the first surface layer, but they are different. Also, it is preferable that they are different. As a result, the friction between the liquid permeable sheet and the absorber becomes large, and when the absorbent article is used, the liquid permeable sheet and the absorber are less likely to be displaced, and the absorbent article is twisted. It becomes difficult.
The difference in fiber orientation means that the fiber orientation angles are different, preferably 30 ° or more, more preferably 45 ° or more, still more preferably 60 ° or more, and even more preferably 75 ° or more. ..

In the absorbent article according to the present disclosure, it is preferable that the absorber does not have a squeezing portion for squeezing the absorber. This is to make the intermediate layer of the absorber function as a fragile layer.

Hereinafter, the present disclosure will be described in more detail based on the examples, but the scope of the present disclosure is not limited to the examples.
[Manufacturing Example 1]
First surface containing thermoplastic resin fibers (polyester (core) and polyethylene (sheath) core-sheath composite fibers, basis weight: 2.8 g / m ² ) and softwood pulp fibers (16.0 g / m ² ). Web No. I prepared 1.
Further, an intermediate containing thermoplastic resin fibers (polyester (core) and polyethylene (sheath) core-sheath type composite fibers, basis weight: 1.0 g / m ² ) and softwood pulp fibers (8.4 g / m ² ). Web No. I prepared 1.
Further, a first containing thermoplastic resin fiber (polyester (core) and polyethylene (sheath) core-sheath type composite fiber, basis weight: 2.8 g / m ² ) and softwood pulp fiber (16.0 g / m ² ). 2 Surface web No. I prepared 1.
First surface web No. 1 and the second surface web No. 1 was flat-pressed at a pressure of 3 MPa.

Second surface web No. 1. Intermediate web No. 1. And the first surface web No. 1 is laminated in that order, and the laminated web No. 1 was formed. Laminated web No. 1. The hydrophilic binder is sprayed from the first surface web side at a weak pressure so as to have a basis weight of 2.0 g / m ² , and then the hydrophilic binder is sprayed from the second surface web side. Amount: Sprayed with a weak pressure so as to be 2.0 g / m ² , and then laminated web No. By heating 1 at 120 ° C. for 20 seconds, the absorber No. 1 was heated. 1 was formed.

According to the microscope, the absorber No. No. 1 is that the fiber density in each of the first surface layer and the second surface layer is higher than the fiber density in the intermediate layer, and the thermoplastic resin fibers in the first surface layer, the intermediate layer and the second surface layer are fused. It was confirmed that the ratio of the binder in each of the first surface layer and the second surface layer was higher than the ratio of the binder in the intermediate layer.

[Comparative Manufacturing Example 2]
Laminated web No. Uniform fiber web No. 1 so as to have the same composition as the average composition of 1 and the same basis weight. I prepared 2. That is, the fiber web No. 2 contains thermoplastic resin fibers (polyester (core) and polyethylene (sheath) core-sheath type composite fibers, basis weight: 6.6 g / m ² ) and softwood pulp fibers (40.4 g / m ² ). It was.
Textile web No. 2 was flat pressed at a pressure of 7 MPa. Flat pressed fiber web No. A hydrophilic binder was sprayed on one surface of No. 2 at a normal pressure so as to have a basis weight of 2.0 g / m ² , and then the fiber web No. 2 was sprayed. A hydrophilic binder was sprayed on the other surface of No. 2 at a normal pressure so as to have a basis weight of 2.0 g / m ² , and the fiber web No. By heating 2 at 120 ° C. for 20 seconds, the absorber No. 2 was formed.

[Comparative Manufacturing Example 3]
Instead of a flat press, at a pressure of 7 MPa, the fiber web No. Absorber No. 2 was formed in the same manner as in Comparative Production Example 2 except that a lattice-shaped embossed portion was formed in 2. 3 was formed.

[Example 1]
Absorber No. 1 is cut into a size of 40 mm × 30 mm (longitudinal direction × lateral direction), and sample No. 1 is obtained. 1 was formed. The gum tape was cut to a length of 50 mm and folded with the adhesive side inside at 20 mm to create two sample holders with a 20 mm grip and a 10 mm adhesive (sample holder 1 and sample holder). 2).

The adhesive surface of the sample holder 1 is designated as the sample No. It is attached to the end portion 10 mm in the longitudinal direction of one surface of No. 1, and the adhesive surface of the sample holder 2 is attached to the sample No. It was attached to the end portion 10 mm in the longitudinal direction of the other surface of 1. The sample holder 1 and the sample holder 2 face each other with the grip portions facing each other.

The sample holder 1 and the sample holder 2 are set on the gripping tool of the autograph, and the sample No. The T-type peeling test of No. 1 was performed, and the maximum strength and the average strength were measured. The results are shown in Table 1.

[Comparative Example 1 and Comparative Example 2]
In the same manner as in Example 1, the absorber No. 2 and absorber No. The T-type peeling test of No. 3 was performed. The results are shown in Table 1.

1 Panty liner 3 Liquid permeable sheet 5 Absorber 7 Liquid permeable sheet 9 Liner peripheral part 11 Round seal part 13 1st surface layer 15 Intermediate layer 17 2nd surface layer 19 Absorber peripheral part 21 Fused part 31 1st Adhesive part 33 Second adhesive part 35 First surface layer side part 37 Second surface layer side part

Claims (18)

Absorbent for absorbent articles
The absorber contains a thermoplastic resin fiber and a cellulosic water-absorbent fiber.
The absorber is arranged between the first surface layer, the second surface layer, the first surface layer and the second surface layer, and more than the fiber density in each of the first surface layer and the second surface layer. It is partitioned into an intermediate layer with a low fiber density and
The absorber has the following configuration (i) and configuration (ii):
Configuration (i) The thermoplastic resin fibers in the first surface layer, the intermediate layer, and the second surface layer are fused, and the ratio of the thermoplastic resin fibers in each of the first surface layer and the second surface layer. Is higher than the proportion of the thermoplastic resin fibers in the intermediate layer,
Configuration (ii) The absorber is adhered by a binder, and the ratio of the binder in each of the first surface layer and the second surface layer is higher than the ratio of the binder in the intermediate layer.
Has at least one of
The absorber, characterized in that. The absorber according to claim 1, wherein the absorber has a basis weight of 35 to 250 g / m ² and a thickness of 0.3 to 4.0 mm, and is an absorber for a thin absorbent article. .. The absorber according to claim 1 or 2, wherein the average fiber length of the thermoplastic resin fiber is longer than the average fiber length of the cellulosic water-absorbent fiber. The absorber according to any one of claims 1 to 3, wherein the fibers constituting the intermediate layer are oriented in a direction along the plane direction of the absorber. The absorber according to any one of claims 1 to 4, wherein the thermoplastic resin fiber contains a crimpable fiber that is crimped. The absorber according to any one of claims 1 to 5, wherein the absorber has a fused portion to which the thermoplastic resin fiber is fused at a peripheral portion thereof. The absorber according to any one of claims 1 to 6, wherein the absorber has a superabsorbent polymer in the intermediate layer. The absorber according to any one of claims 1 to 7, wherein the absorber has the configuration (ii) and the binder is a hydrophilic binder. An absorbent article comprising a liquid permeable sheet, a liquid impermeable sheet, and an absorber disposed between them.
The absorber is the absorber according to any one of claims 1 to 8.
The first surface layer is bonded to the liquid permeable sheet, and the second surface layer is bonded to the liquid permeable sheet.
The absorbent article. The absorbent article according to claim 9, wherein the bonding strength of the first surface layer and the liquid permeable sheet is different from the bonding strength of the second surface layer and the liquid permeable sheet. The absorbent article according to claim 9 or 10, wherein the fiber density of the first surface layer is higher than the fiber density of the second surface layer. The absorbent article according to claim 9 or 10, wherein the fiber density of the second surface layer is higher than the fiber density of the first surface layer. Claims 9-12, wherein the absorber has the configuration (ii), the binder present in the first surface layer is a hydrophilic binder, and the binder present in the second surface layer is a hydrophobic binder. The absorbent article according to any one of the above. Claims 9 to 13 wherein the absorber has the configuration (ii), the binder present in the first surface layer is a hydrophobic binder, and the binder present in the second surface layer is a hydrophilic binder. The absorbent article according to any one of the above. The absorbent article is provided with a round seal portion that seals the liquid permeable sheet and the liquid impermeable sheet on the peripheral edge portion of the absorbent article, and the absorbent body is the round seal. The absorbent article according to any one of claims 9 to 14, which is arranged inside the portion. The invention according to any one of claims 9 to 15, wherein the liquid permeable sheet is made of a non-woven fabric containing cotton fibers, and the cotton fibers and the thermoplastic resin fibers of the first surface layer are entangled with each other. Absorbent article. One of claims 9 to 16, wherein the liquid permeable sheet is made of a non-woven fabric, and the fiber orientation of the fibers constituting the liquid permeable sheet is different from the fiber orientation of the first surface layer. Absorbent article described in. Absorbent for absorbent articles
The absorber contains a thermoplastic resin fiber and a cellulosic water-absorbent fiber.
The absorber is partitioned into a first surface layer, a second surface layer, and an intermediate layer between them.
When the absorber applies a shearing force in a plane direction to the absorber, the absorber breaks at the intermediate layer, and the first surface layer side portion including the first surface layer and the second surface layer. It is configured to be at least partially separated from the second surface layer side portion containing.
The absorber, characterized in that.

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