JPS6019695Y2 - sanitary napkin - Google Patents

Description

[Detailed explanation of the idea] This invention relates to improvements in sanitary napkins.

Some conventional sanitary napkins include an absorbent body with its use side open and wrapped in a leak-proof material, and the entire outside of the absorbent body is covered with a nonwoven fabric.

However, in napkins with this type of structure, if the leak-proof material is conventional polyethylene laminate paper, either the non-woven fabric or the laminated paper is used in excess at the part where the leak-proof material and the non-woven fabric come into contact. There will be.

In addition, when waterproof paper is used as a leak-proof material, it is necessary to use several sheets of low basis weight waterproof paper to make it soft so as not to make rustling noises, and it is also necessary to crepe the waterproof paper. The bulk becomes large and the cost becomes high.

Furthermore, during the production process, rollers are required to feed the leak-proof material and the non-woven fabric separately, which increases the size of the production machine and requires adjustment to prevent the envelope from shifting when the machine is operating. There is a manufacturing disadvantage in that it must be done separately for the nonwoven fabric.

In addition, sanitary napkins are known in which an absorbent material is sandwiched from above and below by non-woven fabric and leak-proof material, and the side edges are joined by heat welding or adhesive, but these napkins do not prevent menstrual blood from leaking. This is a fatal drawback for mass-produced products, as it requires a bonding process during manufacturing, which reduces production speed.

This invention provides a sanitary napkin that does not have the above-mentioned drawbacks, and consists of an absorbent material covered with a surface material having a leak-proof finish applied to a portion of a nonwoven fabric.

This will be explained in more detail below based on the attached drawings.

FIG. 1 shows a cross section of the napkin of the present invention, where 1 is an absorbent body and 2 is a surface material covering the absorbent body.

The absorbent material 1 is made of absorbent paper and/or crushed flocculent pulp, processed paper obtained by sandwiching and pressing an absorbent polymer between sheets of paper, or a mixture of flocculent pulp and absorbent polymer.

As shown in FIG. 2, the surface material 2 is made of a rectangular nonwoven fabric, and a part of the surface material 2 is treated to prevent leakage along one side edge thereof.

In the figure, 2A shows a part that has been subjected to leakproof treatment, and 2B shows a part that is made of nonwoven fabric.

Although the figure shows that about half of the nonwoven fabric is subjected to leakproof processing, the size of this processed portion may be determined depending on the size of the absorbent body.

In the napkin of the present invention, the absorbent body 1 as described above is covered with a surface material 2 such that the leak-proof treated portion 2A surrounds the other portions of the absorbent body 1, leaving most of the usable surface side.
The situation is shown in FIG.

In this case, it is effective to wrap the leakproof portion 2A to the extent that it slightly covers both side edges of the use surface of the absorbent body 1 to prevent menstrual blood from leaking sideways.

Various types of fibers can be used as the nonwoven fabric that is the base material of the surface material, and polyethylene, polyvinyl alcohol, polypropylene, etc. can be used as the leakproof material.

If the non-woven fabric is rayon, any of the above laminations is suitable as a leak-proof material; in the case of polyvinyl alcohol, those with an average polymerization degree of less than 100 have poor leak-proof properties, and those with an average degree of polymerization of more than 2,400 are suitable for film formation. is difficult, so it is preferably in the range of 1000 to 2400,
Also, if the average degree of saponification is less than 88 mol, the leak-proofing property is poor, so a saponification degree higher than that is preferable.

In addition, if the nonwoven fabric is polyester, polypropylene, or a composite fiber of polyester, polypropylene, or a composite fiber of these and polyethylene, or a mixture of rayon, polyester, or polypropylene, or a mixture of both, polyethylene or polypropylene is suitable as the leakproof material. .

According to the napkin of the present invention, the surface material can be used to the minimum necessary extent to completely fulfill the three functions of absorption and leakage prevention, and is extremely effective in terms of material saving.

In addition, the leak-proofing process for the surface material can be performed in one step by supplying the leak-proof material (film) along the flow direction of the nonwoven fabric in the manufacturing equipment, making production easy. Since it is not necessary, it can be mass-produced, which has secondary benefits such as contributing to cost reduction.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the proposed napkin, and FIG. 2 is a plan view of the surface material. 1...Absorber, 2...Surface material, 2A・
...Leakproof processing part, 2B...Nonwoven fabric.

Claims (1)

[Scope of utility model registration request] The absorbent body is covered with a surface material that has been subjected to a leak-proofing treatment along one side edge of a rectangular nonwoven fabric, and the leak-proof treated portion surrounds most of the use side of the absorbent body and the other parts. A sanitary napkin coated with