JPS5854827B2 - Sanitary items - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a novel sanitary product for absorbing and treating menstrual fluid, and more specifically, an absorbent material having an extremely high absorption and retention capacity and an excellent backflow prevention effect. The present invention relates to sanitary products characterized by the structure of the parts.

In general, conventional sanitary products consist of an absorbent body for menstrual fluid made of so-called paper cotton (absorbent paper), pulverized pulp, etc., and a leak-proof sheet such as waterproof paper or plastic film is placed on the outside of the absorbent body during use. This laminate is covered with a water-permeable sheet such as rayon paper or nonwoven fabric.

By the way, although the above-mentioned absorbent material has a relatively high absorption capacity, this capacity depends on the amount of absorbent material used, which not only makes the product bulky but also has a low retention capacity when pressurized. Because of the low temperature, once absorbed menstrual fluid is easily released by the pressure during use, which has the disadvantage that it leaks from the sides of the product, or flows back to the absorbent side that contacts the skin during use and oozes from the surface. .

On the other hand, recently, in order to improve the absorption and retention ability, it has been proposed in Japanese Patent Laid-Open No. 5
No. 1-124091, No. 52-26692, Utsukai Showa 5
No. 1-29796, No. 51-134094, No. 51
= Proposed in No. 134095, etc.

However, these methods simply use the substance as a part of the absorbent body without fully examining the characteristics of the substance and its position in relation to other absorbent materials that make up the absorbent body, and it is difficult to achieve the desired effect. I can't do it.

That is, the substance absorbs and retains a large amount of moisture, but
Since the rate of absorption and swelling is relatively slow and it becomes gel-like, it is inferior in its ability to penetrate and diffuse menstrual fluid in the surface direction of the layer and in the thickness direction, and when it absorbs and swells to a certain extent and becomes gel-like. Therefore, the properties of the substance and other absorbent materials are not effectively utilized in the known proposal, and the ability to retain (amount) of menstrual fluid is limited. There are drawbacks.

For example, when the substance is placed in the lower layer of a multilayer water absorbent made of absorbent material such as absorbent paper, the menstrual fluid absorbed in the upper layer is effectively utilized by the substance's excellent absorption and retention ability. If the substance is placed in the upper layer of the absorbent body, the menstrual fluid will not be sufficiently absorbed by the lower layer. - Therefore, if the absorbent paper at the bottom is not effectively utilized and it oozes out from the surface of the product, and the substance is located approximately in the center layer of the absorbent material, the same thing as in each of the above cases will occur. However, menstrual fluid will seep out from the surface of the product.

Furthermore, when the above-mentioned substance is mixed with pulverized pulp as the material for the absorbent body, there will be a large amount of menstrual fluid that is not sufficiently guided to the above-mentioned substance because the pulverized pulp has weak interfiber bonds. Substances are not utilized effectively (/koma--they are easily released by pressure, backflow, and ooze from the surface of the product).

The present inventor has focused on the characteristics of the above-mentioned substances, and as a result of extensive research into the effective use of them in sanitary products,
We have developed a new sanitary product that improves the absorption and retention ability of the absorbent body and has an excellent absorption mechanism that prevents the absorbed menstrual fluid from flowing back to the surface due to pressure during use.

The configuration of the present invention will be explained based on the illustrated embodiments.
It is as follows.

The absorbent body of the sanitary product according to the present invention is composed of at least a pulverized pulp layer 1, a polymer layer 2 that is water-insoluble and has water-absorbing swelling properties and has a guide portion 4 or 4a, and an absorbent paper layer 5. ing.

The pulverized (cotton-like) pulp layer 1 is arranged with the main purpose of absorbing menstrual fluid in spots and guiding it upward and downward in FIG.

Pulverized pulp has weak interfiber bonds and little capillary action, so it has a narrow absorption area and good water permeability.

Therefore, the menstrual fluid in contact with the upper surface of the pulverized pulp layer 1 can be limited to diffusion in a minimum area and can be absorbed in spots as described above.

The amount of the pulverized pulp layer 1 required only for this spot-like absorption is 75 to 250 g/-, but the amount absorbed and retained in the pulverized pulp layer 1 is minimized so that a large amount of menstruation is not transferred to the water-absorbing paper layer 5. It is preferable to keep the amount to a minimum to allow the liquid to migrate.
The amount is 75-150g/rrt.

The single polymer layer 2 has a water-insoluble substance 3 that is water-absorbent and swellable fixed to at least one side of the water-permeable sheet via a binder (not shown), and a water-absorbing and swelling substance 3 is fixed to at least one side of the water-permeable sheet. A long elliptical guide part 4 or 4a is provided, which allows the menstrual fluid that has been absorbed in spots in the pulverized pulp layer 1 and guided to move through the guide hole 4 to the next water-absorbing paper layer 5. At the same time, it is arranged for the purpose of absorbing and retaining menstrual fluid that has been absorbed and diffused by the water-absorbing paper layer 5.

Although the substance 3 is in the form of powder in the illustrated example, it may be in the form of a film, and the water-permeable sheet on which it is fixed can be applied regardless of whether it is water-absorbing or non-water-absorbing.

The guide portion 4 shown in FIGS. 1 and 2 is formed by making holes in the water-permeable sheet that supports the material 3, and the material 3 is spot-absorbed and guided by the pulverized pulp layer 1. It may be approximately the same size as the spot-like absorption area of menstrual fluid, it may be slightly smaller than this, or it may be relatively large as in the illustrated example, but the maximum This is the size that allows a large amount of excrement to pass through the guide hole 4, and if the guide hole 4 is wider than this, the object of the present invention cannot be sufficiently achieved.

The guide part 4a shown in FIG. 3 does not have any openings like the guide part 4, but covers the same area of the water-permeable sheet that supports the substance 3 as the guide part 4. 3 is not fixed.

Note that the guide portions 4, 4a may be square or diamond-shaped.

Substance 3 includes partially crosslinked starch-modified polymers (graft copolymers with starch and copolymers such as acrylonitrile, acrylamide, acrylic esters, methacrylonitrile, vinyl acetate, methacrylonitrile esters, etc.) At least one type selected from the group consisting of modified CMC (carboxymethylcellulose) cross-linked with epichlorohydrin, incyanate, acrylic acid, formaldehyde, glyoxal, etc., and modified PVA (polyvinyl alcohol) is used.

This substance 3 swells and takes on a gel-like appearance when it absorbs water, and has a much higher absorption and retention capacity than water-absorbing paper and pulverized pulp that have been conventionally used as absorbent materials for sanitary products.

The binder may include water, a water-soluble resin such as CM
At least one type selected from the group consisting of C, sodium alginate, PVA, and water-swellable water-insoluble resins such as ethylene vinyl acetate resin and acrylic acid ester resin is used.

The water-absorbing paper layer 5 is arranged with the main purpose of absorbing and diffusing menstrual fluid from the guide hole 4.

This layer 5 is made of water-absorbing paper commonly used for sanitary products, and has a low water retention capacity when pressurized, so it easily releases menstrual fluid under pressure during use.

In addition, Fig. 1 shows an example of a sanitary product equipped with an absorbent body having such a structure, and numeral 9 is a water-permeable sheet layer made of so-called rayon paper, nonwoven fabric, etc. that does not allow menstrual fluid to permeate and diffuse in the surface direction. It is arranged on the upper surface of the pulp layer 1, and is mainly used to support the pulverized pulp layer 1 in the manufacturing process of sanitary products.

Reference numeral 6 denotes a leak-proof sheet layer such as waterproof paper or plastic film for covering the lower surface and both sides of the laminate consisting of the absorbent body and the water-permeable sheet 9.

T is a flocculent thin layer such as rayon fiber or acrylic fiber, and 8 is a water-permeable sheet layer such as so-called rayon paper or nonwoven fabric, and these 7 and 8 cover the laminate.

In a sanitary product comprising an absorbent body configured as described above,
When menstrual fluid comes into contact with the pulverized pulp layer 1 through the water-permeable sheet layer 8, the cotton-like fiber layer 7, and the water-permeable sheet layer 9, it is absorbed in spots in this layer, and passes through the guide holes 4 to the water-absorbing paper layer 5. and is absorbed and diffused in this layer 5.

At the same time, the menstrual fluid once absorbed and diffused is absorbed and retained by the substance 3 of the polymer layer 2.

By the way, the water-absorbing paper layer 5 has poor water retention ability and easily releases menstrual fluid when pressurized, while the substance 3 absorbs the released menstrual fluid, swells and becomes gel-like, and does not release menstrual fluid when pressurized. The absorbent paper layer 5 absorbs and retains a large amount of the absorbed and diffused menstrual fluid.

When the substance 3 of the polymer layer 2 absorbs menstrual fluid to a certain extent and swells into a gel-like state, it acts as a barrier against menstrual fluid, so that the substance 3 absorbed by the water-absorbing paper layer 5 acts as a barrier to menstrual fluid. Menstrual fluid will be prevented from flowing back into the pulverized pulp layer 1 by the polymer layer 2, and will therefore not seep out from the surface of the sanitary product.

Further, although the substance 3 is not located in the surface area of the water-absorbing paper layer 5 corresponding to the size of the guide hole 4, the pore diameter of the guide hole 4 has become smaller due to the absorption and swelling of the substance 3, and moreover, the water-absorbing paper layer Even if 5 is pressurized, the menstrual fluid that has been absorbed and diffused into the pulverized pulp layer 1
Since the amount released from the absorbent paper layer 5 is small, the amount flowing back into the pulverized pulp layer through the guide hole 4 is also small, and does not seep out from the surface of the sanitary product.

Even if the sanitary product oozes out, the surface of the sanitary product from which it oozes out is originally an absorption port for menstrual fluid and is stained with that fluid, so it does not cause discomfort to the user.

As described above, according to the present invention, the polymer layer 2 can prevent back flow exudation of menstrual fluid, improve the absorption and retention ability of the absorbent body, and therefore make the sanitary product thinner. It has the following effects and is extremely useful for practical use.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional perspective view of a sanitary product to which the absorbent body according to the present invention is applied, FIG. 2 is a perspective view of a single layer of polymer, and FIG. 3 is a perspective view of another embodiment of the single layer of polymer. 1... Crushed pulp layer, 2... Polymer single layer, 3... Water-insoluble material that has water absorbing swelling properties, 4゜4a... Guide Part, 5...
Absorbent paper layer.

Claims (1)

[Claims] 1. An absorbent body is constructed by sequentially stacking a pulverized pulp layer, a single polymer layer, and a water-absorbing paper layer from the absorbent side that contacts the skin during use, and the single polymer layer is made water-insoluble and swells by water absorption. A sanitary product characterized in that a substance having sexual properties is fixed to a water-permeable sheet, and a guide portion in which the substance does not exist is provided approximately in the center of the sheet. 2. The sanitary product according to claim 1, wherein the guide portion is formed by punching holes in the water-permeable sheet. 3. The sanitary product according to claim 1, wherein the guide portion is formed by not fixing a water-insoluble substance that absorbs and swells in water to the water-permeable sheet.