JPS5931228Y2 - sanitary napkins - Google Patents

Description

[Detailed description of the invention] This invention relates to a sanitary napkin, which provides a stable wearing condition without the risk of slipping while being worn, significantly improves leak-proofing properties, and has a rich ability to absorb and store menstrual blood. The purpose of the present invention is to provide a sanitary napkin that is comfortable to wear and can be folded compactly into a stick shape, and its structure is as follows.

In this invention, a main water-absorbing layer made of a highly absorbent polymer is sandwiched between auxiliary water-absorbing layers made of a water-absorbing material such as water-absorbing paper, and these are layered on top of a waterproof layer, making the entire laminate water permeable. The auxiliary water-absorbing layer and the covering material are coated with a coating material, and the central part of the surface of the auxiliary water-absorbing layer and the covering material protrudes in a V-shaped cross section to form a wing-shaped section, and water permeable between the auxiliary water-absorbing layer and the coating material in the wing-shaped section. This sanitary napkin is characterized by being filled with a resilient material.

Embodiments of the present invention will be described below with reference to the drawings.

1 is a waterproof layer, which is made of waterproof paper such as a polyethylene laminate paper case or a polyethylene sheet.

2 is a main water absorption layer made of a super absorbent polymer; 3
is an auxiliary water-absorbing layer made of a general absorbent material such as water-absorbing paper.The auxiliary water-absorbing layer 3 is sandwiched between the main water-absorbing layer 2 so as to wrap it, and this integrated body is layered on top of the waterproof layer 1, making the entire laminate water permeable. (
It is coated with a coating material 4 having high moisture permeability.

The waterproof layer 1 is formed wider than the auxiliary water-absorbing layer 3, and is folded so that both sides in the width direction thereof are rolled up onto both sides of the surface of the auxiliary water-absorbing layer 30.

Therefore, in this sanitary napkin, the wing-like part B is formed by making the central part of the surface of the auxiliary water-absorbing layer 3 and the covering material 4 protrude in a hollow V-shaped cross section over the entire length direction. A water-permeable elastic material 5 is inserted between the auxiliary water absorption layer 3 and the covering material 4 in the wing-shaped portion B.

In this way, the napkin base A and the wing-like part B containing elastic material are integrally connected, and both lengthwise ends of the covering material 4 are sealed together with the base A and the wing-like part B, thereby achieving the present invention. It consists of sanitary napkins.

The above-mentioned elastic material 5 is made of a parallel bundle of long fibers made of tow of rayon staple cotton, l or cellulose acetate, polypropylene, polyester, or other hydrophobic fibers opened into a belt shape, which is soft and has good texture and cushioning properties. Use good quality.

In particular, if the above-mentioned hydrophobic fiber group is used, not only the original elasticity but also the excellent water permeability and moisture backflow prevention function unique to this material allow menstrual blood to quickly permeate into the water absorption layer.
In addition, the highly desirable property of preventing backflow of moisture once permeated can be obtained.

After production, this napkin with such a structure can be easily and effortlessly folded into a bar shape one by one by folding the whole thing in the width direction using the valley line B1 of the wing-shaped part B as a crease, as shown in FIG. Can be folded.

Therefore, it is easy to package, is not bulky, and is very convenient for transportation, storage, and portability.

In this embodiment, the auxiliary water-absorbing layer 3 is formed into a wide sheet with front and back sides, and is folded so that both ends in the width direction are abutted against each other at the wing-shaped valley line B1. 3 is discontinued at the crease (wing-shaped portion valley line Bl).

This makes the creases deeper and therefore easier to fold.

However, since the ease of folding is inherently obtained by having the wing-like part B having a V-shaped cross section, the structure of the auxiliary water absorption layer 3 is, for example, formed separately on the front and back sides, and the central part of the front side part is formed separately. It may be modified as appropriate other than what is shown in the drawings, such as by bending it into a V-shaped cross section.

The auxiliary water-absorbing layer 3 may be formed by stacking a plurality of sheets of water-absorbing paper such as crepe paper, or by sandwiching crushed pulp between them.

The covering material 4 is made of a material that is highly water permeable and has good texture, such as rayon paper, rayon nonwoven fabric, rayon paper laminated with cotton nonwoven fabric, or the like.

On the other hand, the main water-absorbing layer 2 is made of a mixture 21 of cotton-like pulp and powder of a highly water-absorbing polymer.
．． The laminate is sandwiched between 23 sheets, and the laminate is partially embossed to form a thin sheet.

The embossing process is performed with uniform distribution over the entire area of the layer 2 as shown in the figure.

This embossing process causes the mixture 21 to become the absorbent paper 22.2.
It is evenly distributed over the entire surface between the three regions, and is reliably maintained in a constant distribution state without shifting or becoming biased.

In addition, the embossing process compresses the entire body, making it thinner and retaining its shape better.

The polymer constituting the mixture 21 may include starch derivatives (graft copolymers such as acrylonitrile, acrylamide, acrylic acid, acrylic esters, methacrylonitrile, methacrylic esters, or partial hydrolysates thereof, or their partial hydrolysates). crosslinked product), crosslinked carboxymethyl cellulose, polyvinyl alcohol,
Sodium polyacrylate and the like are used.

These substances have extremely high water absorption properties and have the property of swelling and becoming gel-like when absorbed, and have a much higher water absorption and retention ability than general water-absorbing paper, pulverized pulp, and the like.

An example of a material that particularly has such properties is an alkali metal salt (GSP) of a starch-polyacrylonitrile graft copolymer, and a powder of this powder and flocculent pulp that has been thoroughly dissociated using a hammer mill are used. A uniform mixture is obtained by feeding a predetermined weight ratio into a □ mixer with an air stream and stirring.

This can be used for the mixture 21 as the main component of the main water absorbing layer 2.

Alternatively, the above-mentioned mixture 21 is made into a web by itself through a distributor, and then formed into a sheet by wet heat compression bonding [Special absorbent paper GSP sheet (trade name) manufactured by Nippon Vilene Co., Ltd.] is used as the main water-absorbing layer. Good water absorption and storage properties can be obtained.

However, if the main water-absorbing layer 2 is formed by sandwiching the mixture 1 between water-absorbing papers 22 and 23 such as tissue paper and finishing the whole into a sheet as in the illustrated embodiment, the stiff and dry feeling will not occur. , you can get a soft, old-fashioned texture.

In addition, the water-absorbing paper 22.
With the addition of the water absorption capacity of 23, it exhibits an even higher water absorption capacity.

When using the sanitary napkin of the present invention constructed as described above, the wing-shaped part B is inserted between the lunar area and the base body A is put on the napkin with the base body A in contact with the surface of the peripheral part thereof.

Therefore, there is no possibility that the napkin will shift while being worn, and a very stable wearing condition can be obtained. At the same time, menstrual blood is absorbed directly from the wing part B without any leakage, resulting in high absorption efficiency and reliable leakage prevention effect. .

In the case of this napkin, since the wing-shaped portion B is formed to have a V-shaped cross section, when wearing the napkin, the wing-shaped portion B can be easily set in the above-mentioned state by closing the napkin.

After wearing, the wing-shaped portion B expands in the direction of restoring to the original V-shaped posture and fits into the inner surface of the lunar surface, resulting in a more stable and highly leak-proof wearing condition.

Moreover, since the wing-shaped portion B is provided with the elastic material 5, a good contact feeling can be obtained.

It should be noted that even if this elastic material 5 is installed only in the wing-shaped portion B, it is sufficiently effective.

If the parts are placed on both sides of the lower end, the contact feeling will be even better.

In such a wearing state, menstrual blood is absorbed by the covering material 4 of the wing-like part B.
The water passes through the elastic material 5 and is absorbed into the main water absorption layer 2 through the auxiliary water absorption layer 3.

As described above, the main water-absorbing layer 2 has an extremely high water-absorbing capacity as a characteristic of the highly water-absorbing polymer, so that its ability to absorb menstrual blood increases dramatically.

In addition, when the mixture 21 of the main water absorption layer 2 absorbs water, it swells and becomes gel-like, so that once absorbed menstrual blood becomes liquid 1\
There is no risk of the covering material becoming saturated and becoming bulky, or even causing the covering material to tear and overflow.

In other words, it has excellent storage properties for absorbed menstrual blood.

Moreover, even if the mixture 21 swells and becomes a gel, the absorbent paper 22.
Since the main water-absorbing layer 2 is held between 23 and not dispersed, the main water-absorbing layer 2 retains its sheet-like shape at the end, and therefore does not lose its shape when the entire napkin is finished being used.

Moisture can be distributed throughout the mixture 21 through the shredded water-absorbing papers 22 and 23.

In this way, when using real napkins, the water absorption efficiency is good,
Moreover, since the main water absorption layer 2 has excellent water absorption and storage ability, sufficient effects can be obtained even if the main water absorption layer 2 is formed into a fairly thin sheet shape as shown in the figure.

Auxiliary water absorption layers 3 placed on both sides of the main water absorption layer 2,
The front side portion serves as the core of the wing-shaped portion B and as a pipe for guiding menstrual blood to the main water absorption layer 2, and the whole serves as a safety valve in case the amount of menstrual blood is abnormally large.

Therefore, this auxiliary water absorption layer 3 may also be thin, and the thickness of the entire water absorption layer including both the main and auxiliary layers can be made much thinner than in the past.

As a result, the overall thickness of the napkin can be reduced, making it easier to fold the napkin into a rod-like shape as described above, and the napkin can be folded compactly.

As explained above, the sanitary napkin of the present invention has a wing-like section with a V-shaped cross section in the center of the surface, so by inserting this wing-like section between the lunar area and wearing it, the sanitary napkin of the present invention will not shift or move during use. It provides a stable wearing condition with no leakage, significantly improves leak-proofing properties, and allows the whole to be easily folded into a rod shape using the valley lines of the wing-like portions as creases.

Furthermore, the main water absorbing layer made of a super absorbent polymer can significantly increase the ability to absorb and store menstrual blood.

In addition, it is extremely useful in practice, as it can be made thinner overall due to the increased absorption and storage capacity, and provides a good wearing feeling due to the inclusion of elastic material in the wing-like portions.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is a perspective view, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, Fig. 3 is a partially cutaway perspective view of the folded state, and Fig. 4 is A perspective view of the main water absorption layer, and FIG. 5 is an enlarged cross-sectional view taken along the line V-V in FIG. 4. DESCRIPTION OF SYMBOLS 1...Waterproof layer, 2...Main water absorption layer, 3...Auxiliary water absorption layer, 4...Coating material, B... Wing-like part, 5...Bullet material.

Claims (1)

[Claims for Utility Model Registration] A main water-absorbing layer made of a highly water-absorbing polymer is sandwiched between auxiliary water-absorbing layers made of a water-absorbing material such as water-absorbing paper. These are stacked on top of the waterproof layer, and the entire laminate is covered with a water-permeable covering material, and the auxiliary water-absorbing layer button and the central part of the surface of the covering material are made to protrude in a V-shaped cross section to form a wing-shaped part. A sanitary napkin characterized in that a water-permeable elastic material is inserted between the auxiliary water-absorbing layer and the covering material in the wing-shaped portion.