JPH0713321U - Sanitary napkin - Google Patents

Abstract

(57) [Summary] [Purpose] A sanitary napkin is fixed to wearing shorts. [Structure] The outside of the back sheet 3 of the sanitary napkin 1 is formed of a sheet having a coefficient of static friction of 0.84 or more.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a sanitary napkin.

[0002]

[Prior art]

 Conventionally, in order to prevent the sanitary napkin from moving away from the abutting part, an adhesive agent or a coating agent with a low friction coefficient but a large friction coefficient is applied to the bottom surface of the napkin as a fastening means. None, a technique is known in which the fastening means is applied to the inner surface of the crotch portion of the shorts. If the shorts fit snugly on the body, this napkin will stay in close contact with the local area and will not move. In Japanese Patent Publication No. 2-4371, which is a known example of such a technique, a vinyl acetate / ethylene copolymer or acrylic copolymer emulsion, synthetic rubber hot melt, or the like is applied to the lower surface of a napkin as the coating agent. The technology is disclosed.

[0003]

[Problems to be solved by the device]

 By the way, if an adhesive is used for fastening the napkin to the shorts, the adhesive must be protected with a release paper before using the napkin, and the release paper must be removed before use. This causes a problem that it is troublesome and costly for the person who manufactures and uses the napkin. In the case of the above-mentioned known technique, since it is not necessary to protect the applied coating agent with a release paper, it can be a means for solving this kind of problem, but an emulsion or hot melt is applied to the sheet constituting the lower surface of the napkin. Since the coating film of these coating agents is generally thick, it causes the napkin to have high rigidity, which may cause the napkin to be stiff and uncomfortable to wear.

In view of the above, the present invention has an object to solve the above-mentioned problems of the prior art by forming a back sheet from a sheet material having a friction coefficient of a required degree or more.

[0005]

[Means for Solving the Problems]

 The present invention uses means for solving the above-mentioned problems in a sanitary napkin in which a liquid-absorbent core is interposed between a liquid-permeable top sheet and a liquid-resistant back sheet. The outside consists of a sheet having a coefficient of static friction of 0.84 or more.

[0006]

[Action]

 In the sanitary napkin having such a configuration, since the outside of the back sheet has a static friction coefficient of 0.84 or more, it does not slip on the crotch portion of the worn shorts and accordingly does not move relative to the local portion.

No adhesive or coating agent is applied to the back sheet, and the application does not impair the flexibility of the napkin.

[0008]

【Example】

 Details of the sanitary napkin according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a partially cutaway perspective view of a sanitary napkin 1. The napkin 1 comprises a liquid-permeable front sheet 2, a liquid-impermeable back sheet 3, and a liquid-absorbent core 4 interposed between these two sheets 2 and 3. The front and back sheets 2 and 3 are joined to each other at portions extending from the side edge and the end edge of the core 4 to form a side flap 6 and an end flap 7.

For the topsheet 2, a perforated plastic film, a non-woven fabric made of thermoplastic synthetic fibers, or a non-woven fabric in which thermoplastic synthetic fibers are mixed with some hydrophilic fibers such as rayon fibers is used.

The back sheet 3 has a static friction coefficient of 0. 0 measured according to JIS-P8147. A liquid resistance sheet of 84 or more, more preferably 1.0 or more is used. Here, the liquid resistance means that the liquid permeability is not as high as that of the surface sheet, and includes the meanings of liquid impermeability, air impermeable liquid permeability, and liquid impermeable moisture permeability. For such a sheet, as a raw material, a die block polymer or triblock polymer composed of a styrene block and a hydrogenated polyisoprene block, such as “Septon” manufactured by Kuraray Co., Ltd., and a blend of the polymer and the olefin polymer are used as raw materials. There are meltblown nonwoven fabrics and extruded sheets having a thickness of 0.02 to 0.3 mm. These sheets are flexible and stretchable, and are suitable for use as the back sheet 3. The back sheet 3 can also achieve the object of the present invention by a laminated structure in which a sheet having a static friction coefficient of 0.84 or more is placed outside and a sheet having higher liquid impermeability is provided inside the sheet. You can

For the liquid-absorbent core 4, crushed pulp or a mixture of crushed pulp and a superabsorbent polymer is used.

[0013]

[Effect of device]

 The sanitary napkin according to the present invention has a static friction coefficient of the back sheet of 0.84 or more, which is hard to slip on synthetic fibers or cotton cloth generally used for shorts, and when used in combination with such shorts, it causes local damage. It is excellent in preventing menstrual blood from leaking because it does not slip.

When a meltblown non-woven fabric is used for the back sheet, the non-woven fabric has a relatively low degree of fineness in its constituent fibers and is flexible, and the napkin does not feel stiff, so that it is comfortable to wear.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a sanitary napkin.

[Explanation of symbols]

 1 Sanitary napkin 2 Topsheet 3 Backsheet 4 Liquid-absorbent core

Claims (1)

[Scope of utility model registration request] 1. A sanitary napkin in which a liquid-absorbent core is interposed between a liquid-permeable topsheet and a liquid-resistant backsheet, wherein the outside of the backsheet has a coefficient of static friction of 0.84 or more. The sanitary napkin, comprising: