JPS5910222B2 - sanitary napkin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sanitary napkin for treating women's menstrual blood, and in particular to a sanitary napkin that has improved adhesion at the contact portion and prevents menstrual blood from leaking sideways. be.

Conventional sanitary napkins consist of an absorbent body made of cotton-like pulp absorbent paper or absorbent cotton, and a leak-proof layer covering the bottom and sides of the absorbent body.
The structure is entirely wrapped in non-woven fabric.

A wet-laid nonwoven fabric or a dry-laid nonwoven fabric is used as the nonwoven fabric for such sanitary napkins. Wet-laid nonwoven fabrics or dry-laid nonwoven fabrics have a thin, planar structure, and have water repellency due to a binder or a mixture of hydrophobic fibers. Sanitary napkins are held between the crotch when in use, and are shaped like a chevron with a high center and low edges.When menstrual blood drains quickly, the smoothness and water repellency of the non-woven fabric allows the liquid to flow along the surface. flowing sideways,
Causes transverse waves. On the other hand, if the width of the sanitary napkin is narrowed so that it does not become mountain-shaped, the capacity of the absorbent material will decrease, and since the leak-proof layer is rolled up, actual menstrual blood may not be absorbed and leakage may occur. be. In order to prevent such side leakage, Tokuko No. 51-39960, Jikko No. 5
Patent No. 2-15116 proposes improvements in the structure of sanitary napkins, but these are not satisfactory as the adhesion to the contact portion is insufficient and the flow of liquid cannot be sufficiently prevented.

The inventors of the present invention conducted intensive research to improve the drawbacks of the sanitary napkins of Kouhei, and as a result, they discovered a sanitary napkin that easily adheres to the crotch and has a structure that prevents the flow of menstrual blood.The present invention has been achieved. did. That is, the present invention includes at least a nonwoven fabric forming a liquid-permeable surface, a leak-proof layer forming a liquid-impermeable back surface, and an absorbent section inserted between the non-woven fabric and the leak-proof layer, and substantially In a sanitary napkin formed vertically, the central part of the long side of the absorbent part is cut out to form a concave part, and the leak-proof layer is rolled up on the nonwoven fabric to cover the back and sides of the napkin with the leak-proof layer. In addition, to provide a sanitary napkin characterized in that a part of the leak-proof layer other than the edges is fixed onto the non-woven fabric, and a part of the leak-proof layer from the fixed part to the edges is left on the upper surface of the non-woven fabric. It is something. Next, the structure of the sanitary napkin of the present invention will be explained with reference to the drawings. FIG. 1 is an external perspective view showing an embodiment of the sanitary napkin of the present invention, FIG. 2 is a sectional view taken along the line X1-X, and FIG. 3 is a sectional view taken along the line X2-X2'.

That is, in the sanitary napkin of the present invention, the surface of the absorbent part 2 having a recessed part 6 cut out in the center is covered with the nonwoven fabric 1, and the absorbent part 2 is covered with a nonwoven fabric 1.
The leak-proof layer 3 on the back side, which is wider, is rolled up onto the non-woven fabric 1 to cover the back and sides of the napkin with the leak-proof layer 3, and
The non-edge portion of the leak-proof layer 3 is fixed on the non-woven fabric 1,
It is configured to form a leak-proof wall 5 consisting of a portion from the fixed point of the leak-proof layer 3 to the edge, and a thin plate 4 consisting of the nonwoven fabric 1 and the leak-proof layer 3 adjacent to the cutout recess 6 of the absorbent part 2. has been done. As is clear from FIGS. 2 and 3, the absorption part 2
Although the length of the shorter side of the material differs between the ends and the center, the purpose of this is that the absorbent part 2 is generally made by compressing pulp or the like, so it lacks flexibility, and the sanitary napkin can be placed between the crotch. In this case, the contact portion is not sufficiently deformed and good adhesion cannot be expected, so the aim is to reduce the inflexible part of the crotch area and improve the adhesion to the skin.

However, if the length in the short side direction is shortened over the entire length of the absorbent portion 2, the absorbency of menstrual blood will be impaired, so it is necessary to increase the length in the short side direction at the end portions. That is, it is necessary for the absorbent part 2 to have a recess 6 in the center, and to be more specific, the long side is the part whose length in the short side direction is 50 to 90%, preferably 60 to 80% of the maximum value. It needs to be present over 20 to 90%, preferably 40 to 70%, of the total length of the long side, including the central part. Furthermore, in the recess 6 of the absorbent part 2, as shown in FIG.
A thin plate 4 made of the above-mentioned material is directly adjacent to the thin plate 4, and this thin plate 4 is highly deformable and thus promotes adhesion to the abutting portion.

FIG. 4 is a plan view showing various embodiments of the absorbent portion 2 of the sanitary napkin of the present invention.
It is not limited to the example shown in G. Furthermore, a leak-proof wall 5 made of a leak-proof layer 3 is formed on the surface of the sanitary napkin of the present invention that comes into contact with the skin.

The purpose of this leak-proof wall 5 is the smoothness and water repellency of the surface non-woven fabric 1, and also because the napkin is chevron-shaped when in use, menstrual blood tends to flow horizontally on the surface, but the napkin does not touch the skin. Due to the close contact and the presence of the leakage prevention wall 5, the flow in the lateral direction is blocked.The menstrual blood flows vertically along the leakage prevention wall 5, and is guided to the end, making the absorption area 2 more abundant. It is to be absorbed in a certain place. As the absorbent part 2 used in the present invention, cotton-like pulp, water-absorbent paper, rayon cotton, highly absorbent polymeric absorbent material, etc. are used singly or in a layered manner, and as the leak-proof layer forming the leak-proof wall 5, Polyethylene film, polyvinyl alcohol film, polyethylene laminate paper, water-repellent treated waterproof paper, etc. are used.

Next, examples of the present invention will be described. Example 1 A cotton-like pulp having the shape of FIG. A sanitary napkin was obtained by forming a leaky wall 5 and attaching double-sided adhesive tape to the back polyethylene film.

Example 2 A sanitary napkin was obtained in the same manner as in Example 1, except that the absorbent portion was made of a layered layer of rayon cotton and cotton pulp.

Example 3 A cotton-like pulp having the shape shown in Fig. 4C was used as an absorbent part, and rayon cotton was layered on the upper surface of the absorbent part, which was further covered with a non-woven fabric, and then the lower and side surfaces were covered with polyethylene laminated paper. It was rolled up to the upper surface to form a thin plate 4 and a leak-proof wall 5, and a double-sided tape was attached to the polyethylene laminate paper to obtain a sanitary napkin.

Example 4 A sanitary napkin was obtained in the same manner as in Example 3, except that the absorbent portion was made of rayon cotton, cotton-like pulp, and a highly absorbent polymeric absorbent material.

Since the present invention has the grooves as described above, it is possible to provide an extremely excellent sanitary napkin that has excellent adhesion in actual use and is sufficiently effective in preventing side leakage due to the thin plate and the leak-proof wall.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view showing an embodiment of the sanitary napkin of the present invention, Fig. 2 is a sectional view taken along the line X1-X/ in Fig. 1, and Fig. 3 is a sectional view taken along the line X2-X2' in Fig. 1. 4A to 4G are plan views showing various embodiments of the internal absorbent portion of the sanitary napkin of the present invention. 1...Nonwoven fabric, 2...Absorption part, 3...
...Leakproof layer, 4...Thin plate, 5...
Leakage prevention wall, 6...notch recess.

Claims (1)

[Scope of Claims] 1 At least a nonwoven fabric forming a liquid-permeable surface, a leak-proof layer forming a liquid-impermeable back surface, and an absorbent part inserted between the non-woven fabric and the leak-proof layer, and substantially In a sanitary napkin that is generally vertically shaped, the central part of the long side of the absorbent part is cut out to form a recess, and the leak-proof layer is rolled up on the non-woven fabric, so that the back and sides of the napkin are coated with the leak-proof layer. A sanitary napkin that is special in that it covers the non-woven fabric and also fixes the part of the leak-proof layer that is not the edge on the non-woven fabric, leaving the part of the leak-proof layer from the fixed part to the edge on the top surface of the non-woven fabric. . 2. When forming the notch recess in the absorbent part, the length of the short side of the absorbent part is 50 to 90% of the maximum value, and the length of the absorbent part is 20 to 90% of the total length of the long side, including the center of the long side. % of the sanitary napkin according to claim 1.