JPS6041222Y2 - sanitary napkin - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sanitary napkin, and more particularly, to a sanitary napkin with an excellent leak-proofing effect in which a waterproof sheet is bonded to the upper part of the surface material.

Absorbent materials such as sanitary napkins generally consist of a menstrual blood-permeable surface material that comes into contact with the body, a waterproof sheet that prevents leakage of menstrual blood, and an absorbent layer interposed between these materials.

In addition, the structure is such that a waterproof sheet is provided on the bottom (and side) of the absorbent layer made of cotton pulp, absorbent paper, etc. to prevent menstrual blood from leaking, and the top (or the entirety) is covered with a surface material. is common.

Here, as the surface material, wet-laid non-woven fabric, dry-laid non-woven fabric, binder type such as acrylic acid emulsion, binder fiber type such as polyolefin preheat-melted fiber, etc. are used for the adhesive method.

Based on this basic configuration, various studies have been conducted in recent years on materials, shapes, structures, etc.

Originally, the performance of a sanitary napkin requires first of all the ability to absorb menstrual blood and prevent it from leaking, and this point greatly affects the permeability and retention of the absorbent body.

Furthermore, absorbency and leak-proofing properties are properties that interact with each other, and if either of these properties is lacking, a satisfactory napkin cannot be obtained.

In particular, the lack of leak-proofing properties causes many problems in terms of soiling of the shorts, hygiene, and mental aspects.

In order to eliminate these drawbacks, another idea has been reported and is known in which a waterproof layer is formed in the form of a band in the longitudinal direction of the absorbent body only at both edges in the width direction of the absorbent body.

Furthermore, in Japanese Utility Model Publication No. 52-15116, 'the napkin inner body is covered with two outer wrapping materials such as upper and lower sheets of rayon paper or non-woven fabric, and both short side edges and longitudinal side edges of the outer wrapping material are covered with the inner body. A sanitary napkin has been reported which is characterized in that the sanitary napkin is joined and fixed at the center of the side surface and covered so that a frilled edge is formed around the napkin.

However, it cannot be said that even these known sanitary napkins have sufficient leak-proofing properties (absorbency).

In order to further improve these leak-proofing and absorbent functions, the present inventors aimed to provide sufficient leak-proofing properties (resulting in improved absorbency) even when a large amount of menstrual blood is excreted. After repeated research, we have already published Utility Model Application Publication No. 16135/1983,
In Japanese Patent No. 52758, sanitary napkins with excellent leakproof properties were disclosed.

After that, the present inventors conducted further intensive research from a new perspective, and as a result, they arrived at the present invention.

That is, the present invention provides a sanitary napkin consisting of a menstrual blood permeable surface material, a waterproof sheet for preventing leakage of menstrual blood, and an absorbent layer inserted between them, in which the waterproof sheet is a base made of paper or nonwoven fabric. obtained by laminating a water-repellent polymer film layer on the paper, and the rise height of water per hour and minute diameter measured by Klemm's paper water absorption test method (JIS-P8141) is 5 TrrIn or less and the base forms a surface layer of the sanitary napkin,
The waterproof sheet is rolled up to the upper surface of the surface material and to the top of the absorbent layer, and is further joined to the surface material inside the end of the waterproof sheet, which is extremely effective in preventing leakage of menstrual blood. It is possible to provide a sanitary napkin that contributes greatly to the user, such as absorbency, prevention of staining of shorts, improvement of hygiene, and a sense of mental relief.

Here, the constituent materials used in the present invention will be explained.

(2) The surface material is not particularly limited in terms of material, manufacturing method, adhesion method, etc., but it is desirable that it has sufficient menstrual blood permeability.

For example, single or mixed surface materials containing pulp, rayon, polyester, polypropylene fibers, etc. as main components are suitable.

There is also no particular limitation on the date (weight per bottle), but it is generally 15 to 30 F/d.

■ The absorbent materials used for the absorbent layer include conventional rayon cotton, cotton-like pulp, absorbent paper, and superabsorbent polymer compounds, which have been developed in recent years to improve absorption capacity, in single, layered, or mixed forms. etc., and like the surface material, there are no particular limitations.

■ The selection of the tarpaulin sheet is the main point in achieving the purpose of this invention.

The waterproof sheet used in the present invention is a waterproof sheet (polylaminated waterproof paper) made by coating (laminating) a water-repellent film layer on a base made of a fiber layer such as various types of paper or non-woven fabric, and is made using the Clem method for paper. Water absorption test method (JIS-
P8141) when the rising height of water of hour m minute diameter is 5
rIrJn or less.

First, it is important that the base has water repellency, and specifically, it is desirable to use what is generally considered to be a hydrophobic fiber, such as polyethylene, polypropylene, or polyester.

In addition, when using a material that is considered to be hydrophilic, such as pulp or rayon fiber, as the main component, it can be used by treating it with an appropriate sizing agent, oil agent, etc. to give it sufficient water repellency for the purpose. be.

Furthermore, the visibility of the base is not particularly limited, but is 10 to 30 y.
/po level is appropriate.

Next, as the material used as the film layer of the waterproof sheet of the present invention, a water-repellent film such as polyethylene, polybutadiene, ethylene/methacrylic acid copolymer ionomer resin, etc. can be used.

Hydrophilic films such as hollyhinyl alcohol are undesirable because they tend to bleed during absorption and have no significant effect on leak-proofing properties, ie, maximum absorption.

The date (thickness) of the film layer is not particularly limited, as is the case with the base, but 5 to 30 microns is considered to be an appropriate range, taking into consideration the hardness and texture after lamination.

Next, the structure of the absorbent body of the present invention will be explained in more detail with reference to the drawings.

FIG. 1 is a schematic cross-sectional view of a conventional sanitary napkin having a general configuration.

Its structure consists of laminating cotton pulp 3, absorbent paper 4, and rayon cotton 5 as an absorbent layer, a waterproof sheet 2 covers the lower part, side surfaces, and part of the upper part of the absorbent layer, and the entire outside is covered with a surface material. 1.

On the other hand, a partially cut away perspective view of one embodiment of the sanitary napkin of the present invention is shown in FIG. 2, a schematic cross-sectional view taken along the line X-X' in FIG. 4th and 5th schematic drawings
As shown in the figure.

The sanitary napkin of the present invention uses cotton-like pulp 3 as an absorbent layer.
, absorbent paper 4 and rayon cotton 5 are laminated, the upper part thereof is covered with surface material 1, and a waterproof sheet (the waterproof sheet of the present invention 6) is rolled up from the lower side surface to the upper part of the absorbent layer, and from the end thereof. On the inner side 7, the waterproof sheet 6 and the surface material 1 are bonded and fixed by adhesive, heat sealing, or the like.

As for the position of the waterproof sheet 6, it is desirable that the surface layer is on the base side, and furthermore, the distance between the ends of the waterproof sheet on the upper surface of the napkin is suitably about 40 to 80 wn, taking into account the state in which it is worn during use.

Furthermore, the present invention uses materials with excellent feel for the surface material and waterproof sheet, which are the basic components, and for the absorbent layer, in addition to conventional materials, materials with good absorbency such as superabsorbent polymer compounds are used. Needless to say, the effect will be even greater.

Next, the present invention will be explained with reference to examples.

Example 2. 3. Based on the structure shown in Figure 4.5, 0.2 g of absorbent paper, 1.5 g of cotton-like pulp, 0.3 P of rayon-based heatpond nonwoven fabric (fabric weight approximately 20 g/d) as the surface material,
Sanitary napkins were molded using 0.3 g of rayon stable cotton and various waterproof sheets shown in Table 1.

Napkin configurations shown in Figures 3, 4, and 5 in Table 1, obtained by coating (laminating) a waterproof sheet with a water-repellent polymer film layer on a base made of paper or nonwoven fabric. The water repellency of the waterproof sheet, that is, the rising height of water after 10 minutes when measured by paper Klemm's water absorption test method (JIS-P8141) is 5rrrIn or less, and the base is The product of this invention is constructed to form a layer, and the water repellency of the waterproof sheet is 5wI.
Comparative products include those using a material larger than L, or those configured such that the film layer forms a surface layer.

At the same time, the same absorbent paper 0.29. 1.5 f of the same flocculent pulp.

Using 0.65 g of the same surface material (the area of the effective absorption surface is the same) and 0.3 g of the same rayon stable cotton,
A comparison product with a conventional configuration was obtained.

To judge the effectiveness of leak-proofing, the liquid to be absorbed is absorbed into the center of the test product from the surface of use, and then a load of 50 F/c-J is applied and the amount of liquid to be absorbed is increased until leakage from the absorber is observed. The test was repeated at the maximum absorption rate.

The results are shown in Table 1.

As is clear from Table 1, the product of the present invention exhibits much better absorbency than the comparative product.

[Brief explanation of the drawing]

Fig. 1 is a schematic cross-sectional view of a conventional sanitary napkin, Fig. 2 is a partially cutaway perspective view showing an embodiment of the sanitary napkin of the present invention, and Fig. 3 is taken along line XX' in Fig. 2. Schematic cross-sectional view Figures 4 and 5 are schematic cross-sectional views showing other embodiments of the sanitary napkin of the present invention. 1; Surface material; 2; Conventional polylaminated waterproof sheet; 3; Cotton-like pulp; 4; Absorbent paper; 5; Rayon cotton; 6; Polylaminated waterproof sheet of the present invention; 7; Junction point between the waterproof sheet and the surface material.

Claims (1)

[Scope of utility model registration request] A sanitary napkin consisting of a surface material permeable to menstrual blood, a waterproof sheet, and an absorbent layer inserted between them, in which the waterproof sheet is obtained by laminating a water-repellent polymer film layer on a base made of paper or nonwoven fabric. and the rising height of water after one powder is 5 mm or less when measured by paper Klemm's water absorption test method (JIS-P8141), and the base is the surface layer of the sanitary napkin. A sanitary napkin comprising: a waterproof sheet rolled up on the top surface of a facing material and up to the top of an absorbent layer, and further joined to the facing material inside the end of the waterproof sheet.