JPS59228003A - Absorbing article - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to absorbent articles such as disposable diapers and sanitary napkins, and particularly to improvements in the back sheet structure thereof.

Perforated sheets that are both breathable and waterproof have been proposed and put into practical use as the back sheet for this type of product, but they suffer from problems such as moisture leakage under pressure and low tensile and tear strength. Ashi, I still haven't gotten anything to be satisfied with. An object of the present invention is to provide an absorbent article having a back sheet layer that can solve the above-mentioned problems, and the gist of the present invention to achieve that object is to provide an absorbent article having a water-permeable surface. In an absorbent article including a sheet, a water-impermeable back sheet, and an absorbent body interposed between the two sheets, the back sheet is composed of a surface sheet and a back sheet, and the surface sheet includes: The back layer sheet has at least d= groups of holes and a group of mutually discontinuous convex portions protruding toward the absorbent body, and each hole in the surface layer sheet and the back layer sheet has a hole group of d=. 6 Is the IC inside each hole within the convex area? The surface layer sheet and the back layer sheet are integrally joined at each concave portion around each of the image portions, and the surface layer sheet and the back layer sheet are integrally bonded to each other in a positional relationship so that they do not match. Taking the disposable diaper as fully illustrated in the invention as an example, the process is as follows.

As shown in FIG. 1, the diaper includes a top sheet 1, a back sheet 2, an absorbent core 3 interposed between both sheets 1.2, and stretchable elastic members 4 attached to both sides of the absorbent core 30. A diaper having such a structure, which includes adhesive tubes 5 attached to both ends of one waistband 9, is already known.

The present invention is characterized in that the back sheet 2 is composed of a surface sheet 6 and a back sheet 7. As shown in FIG. 2, the surface layer sheet 6 and the back layer sheet 7 are made of water-impermeable sheets with a thickness of 10 to 30 μm, such as flexible synthetic resin films, and the uneven portions 1 are provided on the entire surface by engraving.
0 a z 10 B groups are bonded together in each concave portion (state shown in the second diagram) of the backing sheet 7 using an adhesive, a thermal adhering means, etc., and the bonded area A and the non-bonded area B are bonded together.
The ratio A/B is preferably 9.0 to 0.1. Groups of openings 8 and 9 are provided in the front and back layers 6 and 7, and each opening 8°9 is located within the area of each convex portion 10a, giving a positional relationship in which their centers do not coincide. The size of 8,9 is preferably 0.001 to 3-1, more preferably 1μ to 10
0μ, and the distance between the center positions of these holes is preferably O,'
05-2 earthquakes. The size of each uneven portion 10a, 10b is preferably 0.01 to 1.2, the number of 1-2 portions thereof is preferably 1 to 100, and the interval between their center positions is preferably 0.05 to 1.2. 2 questions, their apparent height is preferably between 0.5 and 16 m. Each uneven part 10g,
The planar shape of 10b may be either round or square.

Although the concave and convex portions 10 a p 10 b shown in FIG. It is only necessary that the recesses 10b in contact with the front and back sheets 6 are discontinuous.In FIG. The embodiment of the continuous back sheet 1 is shown below, and the preferred numerical conditions for this embodiment are as follows: each convex portion 10b
The same can be said about the convex portion (not shown) corresponding to .

In the back sheet 1 of the embodiment shown in FIG. 4, the surface sheet 6 also includes the uneven portions 10a of the back sheet 7 shown in FIG.
Concave and convex portions 11a and 11b are provided so as to be symmetrical with 10b.

In the back sheet 1 of the embodiment shown in FIG. 5, in order to maintain the bulk of the back sheet 1, the openings 8, 9'A-- do not come out into the space 12 formed by the front and back layer sheets 6 and 7. A strong repellent filler material 13, such as foam particles of different sizes, is placed.

According to the present invention having the above-mentioned configuration, the back side seam)
Openings 8 between the surface sheet 6 and the back sheet 7 configured in 1.
Since the center position of the absorber 3 is shifted and the openings 8 and 9 are located with a space between them in the thickness direction of the back sheet 1,
Even if the article of the present invention that has absorbed body fluid is pressurized, the body fluid will not leak out from the openings 8 and 9.
Since they are provided as described above, it is possible to form them larger than the openings in the back sheet of conventional absorbent articles, resulting in good air permeability. As mentioned above, since it has a multilayer structure and has spaces, it has rich cushioning properties and feels good to the touch. Furthermore, since the back sheet 1 is constructed by being integrally joined to the front and back layers 6 and 7, although only partially, many excellent effects such as increased strength can be obtained, which is extremely useful in practical use.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway developed plan view of a disposable diaper to which the present invention is applied, FIG. 2 is a partially enlarged cross-sectional view of the same as the above, and FIG.
The figure is a partially enlarged plan view showing another embodiment of the back sheet,
FIG. 4 is a partially enlarged sectional view showing another embodiment of the back sheet, and FIG. 5 is a partially enlarged sectional view showing still another embodiment of the back sheet. 1... Back sheet, 2... Top sheet, 3... Absorber, 6... Surface sheet, 7... Back layer sheet, 8,
9... Opening, 10a... Convex part, 10b... Concave part. Figure 11 Figure 2 Figure 3 Figure 4 Figure 5

Claims (3)

[Claims] (1) In an absorbent article including a water-permeable top sheet, a water-impermeable back sheet, and an absorbent body interposed between the two sheets, the back sheet is composed of a top sheet and a back sheet. , the surface layer sheet is provided with at least a group of holes, and the back layer sheet is provided with a group of holes and a group of mutually discontinuous convex portions protruding toward the absorbent body, and each of the surface layer sheet and the back layer sheet is provided with a group of holes and a group of mutually discontinuous convex portions protruding toward the absorbent body The openings are arranged in a positional relationship such that the centers of the holes do not coincide within the area of each image, and the surface sheet and the back sheet are integrally joined at each recess around each image. The article characterized in that: (2) The size of the openings in the surface layer sheet and back layer sheet is 0.
001~3, the interval between the center positions of each hole is 0.05~2
The absorbent article according to claim 1, wherein the absorbent article has a diameter of m. (3) The size of the convex portion is 0.01 to 1 cm2.1cr
r? The number of pieces per piece is 1 to 100, the interval between the center positions of each convex part is 0.05 to 2 mm, and the apparent height f is 0.5 to 16.
The absorbent article according to claim 1 or 2, wherein the absorbent article is wn.