JPS5854826B2 - 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, a structure of an absorbent body having an extremely high absorption and retention capacity and an excellent backflow prevention effect. Regarding sanitary products characterized by.

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 absorbent body has a relatively high absorption capacity, this depends on the amount of absorbent material used, which not only makes the product bulky for dogs, but also has a low retention capacity when pressurized. Therefore, once absorbed, the menstrual fluid is easily released by the pressure during use, resulting in leakage from the sides of the product, or backflow to the absorbent side that comes in contact with the skin during use, and oozes from the surface.

On the other hand, recently, in order to improve the absorption and retention ability, the use of a gel-like substance that has water absorption and swelling properties has been proposed in Japanese Patent Laid-Open No. 5
No. 1-124091, No. 5220692, Utility Model No. 1-124091
-29796, 51-134094, 51-1
It has been proposed in No. 34095, etc.

However, in these methods, the substance is simply used as a part of the absorbent body without sufficiently examining the properties of the substance and its position in relation to other absorbent materials that make up the absorbent body, and the desired effect may not be achieved. is not obtained.

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. , instead of acting as a barrier to menstrual fluid, the known proposals have disadvantages in their ability to retain menstrual fluid, as the properties of the substance and other absorbent materials are not effectively utilized. .

For example, if the substance is placed in the lower layer of a multi-layer absorbent body made of absorbent material such as absorbent paper, a large amount of menstrual fluid will be transferred to other absorbent materials in the upper and middle layers before it reaches the substance. If the substance is placed in the upper layer of the absorbent body, it will be absorbed and the excellent absorption and retention capacity of the substance will not be utilized effectively, and it will be easily released by pressure and will flow back and ooze out from the surface of the product. If the menstrual fluid is not sufficiently absorbed by other absorbent materials in the underlying layer, it will come out from the surface of the product, and if the substance is located approximately in the central layer of the absorbent material, In this case, the situation is almost the same as in each of the above cases, and menstrual fluid oozes from the surface of the product.

In addition, when the above-mentioned substances are mixed with pulverized pulp as the absorbent material of the absorber, since the pulverized pulp has weak interfiber bonding and little capillarity, there is a large amount of the above-mentioned substances that do not come into contact with menstrual fluid and do not absorb it. As a result, it is easily released by pressure, flows back, and oozes out from the product surface.

The inventor of the present invention has focused on the properties of the above-mentioned substances and has conducted extensive research into the effective use of them in sanitary products.As a result, the absorption and retention capacity of the absorbent material has been significantly improved, and once absorbed, We have developed a new sanitary product that has an excellent absorption mechanism that prevents menstrual fluid from leaking back to the surface due to pressure during use.

The configuration of the present invention will be described below based on the illustrated embodiments.

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 guide pores 4, and a water-absorbing paper layer 5. There is.

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.

Since pulverized pulp has weak interfiber bonds and little capillarity, it has a small water absorption area and good water permeability.

Therefore, the menstrual fluid that comes into 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 crushed pulp layer 1 required for this spot-like absorption is 75
~25oi/rt? However, as much as possible, the crushed pulp layer 1
It is preferable to keep the amount to a minimum so as to reduce the amount absorbed and retained by the absorbent paper layer 5 and transfer a large amount of menstrual fluid to the absorbent paper layer 5, and the amount is 75 to 150 g/m.

In the polymer single layer 2, a water-insoluble substance 3 having water-absorbing and swelling properties is fixed to the lower surface of the water-permeable sheet via a binder (not shown), and guide strips are provided at appropriate intervals over the entire surface of the layer. It is provided with pores 4, and absorbs the menstrual fluid that has been absorbed and guided in spots by the pulverized pulp layer 1, and also transfers excess menstrual fluid from the guide pores 4 to the next water-absorbing paper layer 5. The main purpose of this arrangement is to absorb and retain the menstrual fluid absorbed and diffused by the absorbent paper layer 5.

Note that this polymer layer 2 may be one in which the substance 4 is made into a water-permeable sheet.

Substance 3 may be in the form of a powder or a film,
The water-permeable sheet to be fixed thereto can be applied regardless of whether it is water-absorbing or non-water-absorbing, and the guide pores 4 have a diameter of 0.5 to
2nd place is preferred, but is not limited to this.

Substance 3 includes partially crosslinked starch-modified polymers (acrylonitrile, acrylamide, acrylic acid ester, methacrylonitrile, vinyl acetate, methacrylonitrilic acid ester, etc. as monomers and copolymers for graft copolymers with starch), At least one type selected from the group of modified CMC (carboxymethylcellulose) crosslinked with epichlorohydrin, isocyanate, 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
C. Sodium alginate PVA1 At least one type selected from the group of water-swellable water-insoluble resins such as ethylene vinyl acetate resin and acrylic ester resin is used.

The water-absorbing paper layer 5 is arranged primarily to absorb and diffuse menstrual fluid from the guide pores 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 the absorbent body of the present invention having the above-described structure, and 10 is a water-permeable sheet such as so-called rayon paper or non-woven fabric that does not allow menstrual fluid to permeate and diffuse in the surface direction. This layer is disposed on the upper surface of the pulverized pulp layer 1, and is mainly used to support the pulverized pulp in the manufacturing process of sanitary products.

Reference numeral 1 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 layer.

8 is a cotton-like thin layer such as rayon fiber or acrylic fiber, and 9 is a water-permeable sheet layer such as rayon paper or nonwoven fabric.
The laminate is thus coated.

Furthermore, FIG. 2 shows an embodiment in which a thin water-absorbing paper layer 6 is disposed between the pulverized pulp layer 1 and the single polymer layer 2, and the rest of the structure is the same as that of FIG. 1.

In the sanitary product comprising the absorbent body of the present invention having the above-described structure, menstrual fluid is absorbed through the water-permeable sheet layer 9 and the cotton-like thin layer 8.
When 1t of crushed valve layers come into contact with each other through the water-permeable sheet layer 10, it is absorbed in spots by this layer 1, and the polymer layer 2I
Most of the menstrual fluid is absorbed and diffused into the absorbent paper layer 5 through the guide pores 4 group.

This absorbed and diffused menstrual fluid is absorbed by the water-absorbing paper layer 5 due to the pressure when using the sanitary product, since the water-retaining capacity of the water-absorbing paper layer 5 is low.
However, since the menstrual fluid in this case is diffused and the amount of fluid is smaller than when it is absorbed by the crushing valve layer 1, the material 31 in the polymer layer 2 does not come into contact with the menstrual fluid. It is absorbed by the lever and is not absorbed back into the grinding valve layer 1 through the guide pores 4.

If the material 3 of the polymer layer 2 swells and becomes gel-like as a result of being used for a long period of time, the guide pores 4 may become smaller or The swelling substances come into contact with each other to form a film that closes the guide pores 4, but in this case the backflow is more reliably prevented and no oozing from the surface of the sanitary product occurs.

In addition, when a thin water-absorbing paper layer 6 is arranged as shown in Fig. 2, the menstrual fluid absorbed in spots by the crushing valve layer 1 is once absorbed and diffused by this layer 6, and then becomes the aforementioned layer. However, this layer 6 does not need to be provided.

According to the absorbent body according to the present invention, the polymer single layer 2 absorbs a part of menstrual fluid in the process of being excreted from the user and transferring to the absorbent paper layer 5, and the majority of the fluid is not absorbed in the process. The amount of water is transferred to the water-absorbing paper layer 5 through the 4 groups of guide pores, and once absorbed and diffused in this layer 5, it is absorbed again, so the absorption and retention ability of the absorbent material is significantly improved. In addition, the sanitary napkin has features such as being able to reliably prevent backflow exudation and also allowing the sanitary napkin to be made thinner, making it extremely useful in practical use.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional perspective view of a sanitary product to which an absorbent body according to the present invention is applied, and FIG. 2 is a cross-sectional perspective view of a sanitary product to which an absorbent body according to another embodiment of the present invention is applied. DESCRIPTION OF SYMBOLS 1... Grinding valve layer, 2... Polymer single layer, 3... Water-insoluble material that has water absorbing swelling properties, 4... Guide pores. , 5... Water-absorbing paper layer.

Claims (1)

[Claims] 1. A crushed pulp layer, a polymer layer and a water-absorbing paper layer in which a water-insoluble substance having water-absorbing and swelling properties is fixed on a water-permeable sheet, and guide pores are provided at appropriate intervals. ,
A sanitary product characterized in that the absorbent body portion is constructed by sequentially laminating layers starting from the absorbent side that comes into contact with the skin during use. 2 A starch-modified polymer in which a single layer of water-insoluble water-absorbing swelling material is partially cross-linked (graft copolymers with starch and copolymers such as acrylonitrile, acrylamide, acrylic esters,
methacrylonitrile, methacrylonitrile ester,
(vinyl acetate, etc.), modified CMC, and modified PVA (epichlorohydrin, incyanate, acrylic acid, formaldehyde, glyoxal, etc. as a crosslinking agent). Sanitary items.