JPS61141361A - Absorbing body of sanitary article - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to sanitary napkins and disposable diapers.

Sanitary products such as breast pads, incontinence pads, and postpartum pads.

In particular, it relates to absorbents for sanitary napkins.

Sanitary napkins that have been proposed and generally put into practical use include a liquid-absorbent core, a liquid-impermeable sheet that covers at least the back surface of the core, and a liquid-permeable sheet that covers at least the surface of the core. In addition to this, there is also a structure in which a liquid-permeable cushion layer with a low fiber density is interposed between the core body and the liquid-permeable sheet.

As the material for the core body, pulverized pulp, water-absorbing paper, superabsorbent polymer, etc. are used.

The liquid-impermeable sheet may include a plastic film,
Waterproof paper is used. As the liquid-permeable sheet, a nonwoven fabric made of a mixture of 11 aqueous fibers and hydrophobic fibers or a single hydrophobic fiber, and in which the fibers are bonded by a binder, thermal welding, or entanglement, is used. The liquid-permeable cushion layer may be made of hydrophilic fibers or hydrophobic fibers alone or in combination. A liquid sheet (nonwoven fabric) with a fluffy fiber layer of low density integrally provided on the back side is used.

However, traditional napkins meet various requirements for a napkin, the main ones being: body fluids do not spread on the surface, body fluids are quickly absorbed into the interior, body fluids do not flow back, and the material feels good against the skin. It does not satisfy the necessary condition of being good. The main causes are that solid viscous substances do not penetrate the surface and cause clogging, and body fluids do not pass through each layer quickly and are retained from the upper layer to the lower layer, reducing the sustainability of absorption capacity. Because of the low compression recovery rate, the liquid holding capacity decreases due to shape change. This can be mentioned.

As a result of intensive studies, the present inventors have found a means to eliminate the above-mentioned major causes and have arrived at the present invention.

Embodiments of the present invention will be described with reference to illustrated examples.
It is as follows.

As shown in FIG. 1, the absorbent body of the present invention has a first layer 1 forming a surface that comes into contact with the skin, a second layer 2 forming an intermediate portion through which body fluids permeate, and 1 forming a body fluid retaining portion. The third layer 3 includes an upper layer 3a and a lower layer 3b.
It consists of

The first layer 1 needs to have functions such as allowing solid and viscous substances to pass through it, having the required strength, not having liquid retention properties, and being soft to the touch, and also needs to be integrated by heat melting. 5~
3 denier, 30-70% by weight hydrophobic fibers, and 0.5
-6 denier, 70-30% by weight of synthetic fibers that melt at 90-200°C, with a basis weight of 3-20 g/m
Preferably, it consists of

The hydrophobic fibers include polypropylene, polyester, etc., and the hot melt synthetic fibers include polyethylene-
Polypropylene composites, low melting point polyesters, and the like are preferably used.

In some cases, the first layer 1, which is a separate layer, may include synthetic fibers of 0.5 to 3 deniers and 30 to 70% by weight that exhibit hydrophilic properties on the surface in contact with the liquid, and synthetic fibers of 0.5 to 6 deniers and 70 to 30% by weight. 9% by weight
A mixture with synthetic fibers that melts at 0 to 200°C and has a basis weight of 3 to 20 g/rd may be used. As the synthetic fiber having hydrophilicity on the liquid contact surface,
Polyester, polyethylene, acrylonitrile, and polypropylene are preferably used. - The second layer 2 quickly guides the body fluid from the first layer 1 to the third layer 3 by absorption transfer due to wetting of the body fluid and physical passage of the body fluid, and achieves the required compression recovery rate without disastrous and thermal melting. Because of the need to integrate synthetic fibers with a hydrophilic surface of 3 to 20 denier and 50 to 95% by weight on the liquid contact surface, we used synthetic fibers of 20.5 to 12 denier and 5 to 50% by weight that melt at 90 to 200°C. Preferably, it is mixed with fiber and has a basis weight of 10 to 80 g/m2 and a density of 0.005 to 0.1 g/rffl. Examples of synthetic fibers that exhibit hydrophilicity on the liquid contact surface include polyester, polyethylene, and
r, M+)-jol,-back42. Hot melt before
1. As the fused synthetic fiber, polyethylene-polypropylene composite, low melting point polyester, etc. are suitably used.

The upper layer 3a of the third layer 3 stores solid and viscous substances, transfers bodily fluids to the lower layer 3b, provides a required compression recovery rate, and is required to be integrated by thermal melting. In order to exhibit the
Since it is necessary to make it more difficult to wet than the material b, we used 3-20 denier, 50-95% by weight hydrophilic fibers, and 0.5-12 denier, 5-50% by weight synthetic fibers that melt at 90-200°C. It is a mixture of

Fabric weight: 20-150g/dimension, density: 0.05-0.2g/c
+d is preferred. As the hydrophilic fibers, rayon, acetate, vinylon, etc. are preferably used, and as the hot melt synthetic fibers, polyethylene-polypropylene composites, low melting point polyesters, etc. are preferably used.

The lower layer 3b of the third PJ 3 needs to suction and take away the body fluid present in the second layer 2, retain the body fluid from the lower layer, give the required compression recovery rate, and integrate it by thermal melting.
3-50% by weight superabsorbent polymer and 5-70% by weight
A mixture of hydrophilic fibers and 5-30% by weight of synthetic fibers that melt at 90-200°C, with a basis weight of 50-200°C.
g/rd, density 0.05-0.5 g/CIl?
Preferably, it consists of Examples of the superabsorbent polymer include starch-acrylic acid copolymer.

The hydrophilic fibers are preferably pulverized pulp, rayon, cotton, vinylon, etc., and the hot-melt synthetic fibers are preferably polyethylene-polypropylene composites, low-melting polyesters, and the like.

As another preferred embodiment of the present invention, as shown in FIG. 2, it is preferable to sandwich the lower 3 bits of the third layer 3 with a water-absorbing sheet material 3c such as tissue paper.

・First layer 1, second layer 2. The inside of each layer of the third layer 3 and the space between each layer are integrated by performing heat treatment at 90 to 200°C. This integrated layer, that is, the absorbent body of the present invention, has a large number of voids communicating from the first layer 1 to the third layer 3, and has a compression recovery rate of 30 when dried under a load of 50 g/cxl. % or more.

In addition, the absorbent material of the present invention, especially when used for sanitary napkins, has an overall basis weight of 80 to 500 g/m2,
It is preferable that the thickness is 3 to 10 nn.

Furthermore, in the present invention, ``synthetic fibers having hydrophilicity on the surface in contact with liquid'' are known in the textile industry as sweat-absorbing and water-absorbing synthetic fibers, and such fibers include It is preferable that the surface in contact with the fiber exhibits hydrophilic properties like rayon fibers, but does not have water-retentive properties like rayon fibers.

According to the present invention, as described above, the absorbent body includes a first layer 1 forming a surface in contact with the skin, a second layer 2 forming an intermediate layer through which body fluids permeate, and a body fluid retention layer. Second layer 3
Furthermore, the third layer is composed of an upper layer 3a that stores solid viscous substances and transfers body fluids to the lower layer 3b, and sucks and takes body fluids present in the second layer 2 and transfers body fluids from the lowest layer. The lower layer part 3b retains the fluid, and each of these layers is integrated with hot-melt synthetic fibers so that the absorption of body fluids will not be hindered by shearing or delamination. The first layer 1 to the third layer 3 have a large number of voids in communication with each other, which are effective for quickly permeating body fluids without causing clogging and increasing the absorption and retention capacity of body fluids. Since the compression recovery rate is high due to the material properties of each layer, it is possible to eliminate all the drawbacks of the prior art, which cannot satisfy the requirements for napkins and the like as described above.

[Brief explanation of drawings]

1- is a sectional view of the absorbent body of the present invention, and FIG. 2 is a sectional view of the same absorbent body showing another embodiment.

Claims (6)

[Claims] (1) A structure consisting of a first layer forming a surface in contact with the skin, a second layer forming an intermediate part through which body fluids permeate, and a third layer forming a body fluid retaining part, which are listed below. An absorbent material for sanitary articles that has the following characteristics. A first layer is 0.5-3 denier, 30-70% by weight
It is a mixture of hydrophobic fibers of 0.5 to 6 denier and 70 to 30% by weight of synthetic fibers that melt at 90 to 200°C, and has a basis weight of 3 to 20 g/m^2. B The second layer consists of a synthetic fiber of 3 to 20 denier and 50 to 95% by weight that exhibits hydrophilic properties on the liquid contact surface and a synthetic fiber of 0.5 to 12 denier and 5 to 50% by weight that melts at 90 to 200°C. It is mixed with fiber and has a basis weight of 10 to 80 g/m^2 and a density of 0.005 to 0.1 g/cm^3. C The third layer consists of an upper layer and a lower layer, a. ~2
Mixed with synthetic fibers that melt at 00°C, with a basis weight of 20
~150g/m^2, density 0.05~0.2g/cm^
Consists of 3. b The lower layer contains 3 to 50% by weight of a superabsorbent polymer,
5-70% by weight of hydrophilic fibers and 5-30% by weight of 90%
Mixed with synthetic fibers that melt at ~200℃, area weight 50~200g/m^2, density 0.05~0.5g/c
It consists of m^3. D The first layer, second layer, and third layer are integrated by being joined within each layer and between each layer by melting by the hot-melt synthetic fiber in each layer. E The integrated layer has voids that communicate from the first layer to the third layer. F The integrated layer has a compression recovery rate of 30% or more under a load of 50 g/cm^2 when dry. (2) The absorbent body for sanitary articles according to claim 1, wherein the lower part of the third layer is sandwiched between water-absorbing sheet materials. (3) The absorbent body for sanitary articles according to claim 1, wherein the integrated layer has a basis weight of 80 to 800 g/m^2 and a thickness of 2 to 10 mm. (4) A structure consisting of a first layer forming a surface in contact with the skin, a second layer forming an intermediate part through which body fluids permeate, and a third layer forming a body fluid holding part, which are listed below. An absorbent material for sanitary articles that has the following characteristics. A The first layer consists of synthetic fibers of 0.5 to 3 denier and 30 to 70% by weight that exhibit hydrophilic properties on the liquid contact surface, and synthetic fibers of 0.5 to 6 denier and 70 to 30% by weight that are melted at 90 to 200°C. It is a mixture with synthetic fibers having a basis weight of 3 to 20 g/m^2. B The second layer consists of a synthetic fiber of 3 to 20 denier and 50 to 95% by weight that exhibits hydrophilic properties on the liquid contact surface and a synthetic fiber of 0.5 to 12 denier and 5 to 50% by weight that melts at 90 to 200°C. It is mixed with fiber and has a basis weight of 10 to 80 g/m^2 and a density of 0.005 to 0.1 g/cm^3. C The third layer consists of an upper layer and a lower layer, a. ~2
Mixed with synthetic fibers that melt at 00°C, with a basis weight of 20
~150g/m^2, density 0.05~0.2g/cm^
Consists of 3. b The lower layer contains 3 to 50% by weight of a superabsorbent polymer,
5-70% by weight of hydrophilic fibers and 5-30% by weight of 90%
Mixed with synthetic fibers that melt at ~200℃, area weight 50~200g/m^2, density 0.05~0.5g/c
It consists of m^3. D The first layer, second layer, and third layer are integrated by being joined within each layer and between each layer by melting by the hot-melt synthetic fiber in each layer. E The integrated layer has voids that communicate from the first layer to the third layer. F The integrated layer has a compression recovery rate of 30% or more under a load of 50 g/cm^2 when dry. (5) The absorbent body for sanitary articles according to claim 4, wherein the lower layer of the third layer is sandwiched between water-absorbing sheet-like articles. (6) The basis weight of the integrated layer is 800 g/m^2, and the thickness is 10
The absorbent body for sanitary articles according to claim 4, wherein the absorbent body has a size of 1 mm or less.