JPS6033508B2 - sanitary napkin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in sanitary napkins that absorb and retain menstrual blood.

The structure of this type of napkin that has been generally proposed and put into practical use, especially the leak-proof structure to prevent leakage of menstrual blood, is to raise a plastic film or prevention paper from the bottom surface of the absorbent body to both sides. It is made up of.

In addition, some proposals have been made that use foamed plastic sheets instead of the above materials, but these merely utilize the general characteristics of these sheets as they are, and the leak-proof properties have not been compared to those using such sheets. No special innovations have been made to improve the leak-proof structure, such as the fact that it is not possible to further improve the leak-proof structure. Similarly, no consideration has been given to shaping the wearer's body shape to fit the wearer's body shape. The purpose of the present invention is to fully utilize the characteristics of foamed plastic to create a leak-proof structure.
The purpose of the present invention is to provide a napkin that is excellent in body shape conformity and shape retention, and to achieve this purpose, the present invention is made of thermoplastic elastic foam, and the concave portion is formed by leaving the periphery of the napkin. The method includes a provided leak preventer, an absorbent body housed in the recess, and at least a water permeable top sheet covering the surface of the absorbent body, and at least the leak preventer and the water permeable top sheet are joined and integrated. A sanitary napkin is characterized by the following features:

Further, the present invention will be explained based on the illustrated embodiments,
It is as follows.

FIG. 1 is a plan view of the napkin, FIG. 2 is a side view thereof, and FIGS. 3 and 4 are sectional views taken along line A-A in FIG.

Nuff as shown.

The Kin 1 basically consists of a leak preventer 2, an absorbent body 3, and a water-permeable top sheet 4. The leak preventer 2 is made of thermoplastic elastic single foam plastic and has a concave portion 5 with a surrounding green portion.
The recess 5 is formed to have a narrow center width.

Furthermore, the lateral side walls 6 of the recess 5 are formed to be relatively narrow along the shape of the recess 5, and the outside of the side wall 6 is formed into a curved surface, and the vertical side walls 7 of the recess 5 are made to gradually become lower outward in the same direction. It is tilted to . Furthermore, flaps 8 and 9 are provided on the outside of the side walls 6 and 7. In addition, the leak preventer 2 may have a concave portion 6 having the same width over the body and a narrow center width as shown in FIG. 2 to 2 broadsides, preferably 4 to 6 willows, width 2
0-7 ratio, preferably 40-45 side, length 40-19
0 willow preferably 140 to 160 skin.

The thickness of the side wall 6 is from 1 to 20 thick, preferably from 4 to 6 thick.
The thickness of the bottom of the recess 5 and the flaps 8 and 9 is preferably 1 to 6, preferably 2 to 4, and especially the thickness of the flaps 8 and 9 is preferably 0.5 to 6.
The width of the flaps 8 and 9 is 2 to 1 inch, preferably 4 to 6 inches. One preferable material for the leak preventer 2 is single foam polyethylene, which has an apparent density of 0.014 to 0.1 crab, preferably 0.02 to 0.
0/female, tensile strength 1.0-18.0 preferably 3.
0 to 6.0 x 9/bi, elongation 100 to 360%, preferably 150 to 250%, compression hardness 0.1 to 3. 0.2 to 2 kg/c fin (the above is JIS-K-
6767). The leak preventer 2 having the above-mentioned shape and material characteristics can be formed by, for example, preheating a foamed polyethylene sheet of a required thickness and then molding it with a hot press or by vacuum molding.

The absorbent body 3 may be made of defibrated pulp, crepe absorbent paper, etc., and the water-permeable top sheet 4 may be made of a nonwoven fabric, preferably a nonwoven fabric without using a fiber additive. An absorber 3 is housed in a recess 5 of a leak body 2, and its upper surface, side walls 6, 7, and flaps 8, 9 are covered with a top sheet 4, and each member is integrated.

In the embodiment shown in FIG. 4, the absorbent body 3 is covered with a top sheet 4, which is housed in a recess 5 and integrated. The above-mentioned integration is performed by joining the necessary backing materials together using adhesives, heat welding, or other means. A nonwoven fabric 10 may be integrally pasted on the lower surface of the leak preventer 2, if necessary, and embossing may be applied to the lower surface of the recess 6 and the flaps 8, 9, if necessary. Although it is preferable that the flap 8 is provided and curved upward as illustrated in FIG. 5, it is not necessary to provide the flap 8 and curve it. According to the present invention having the above configuration, the napkin is shaped in advance into a desired shape.

The absorbent body 3 is housed in the recess 5 of the structure-imparted anti-aggregation body 2 and covered with a water-permeable top sheet 4, or the absorbent body 3 is covered with the water-permeable top sheet 4 and placed in the leak preventer 2. The leak preventer 2 is constructed by storing it in a recess and joining and integrating the required members, but since the leak preventer 2 has elasticity, even if the napkin is folded in for individual packaging, it can be removed from the packaging when worn. When worn, it almost recovers to its original state, leaving fewer deep creases or creases that can lead to leakage of menstrual blood, and even if compressive deformation force is applied due to the wearer's movements, it will remain normal when the wearer takes a normal posture. Restore to worn condition. Furthermore, since the absorbent body 3 is accommodated in the recess 51 of the leak preventer 2, so-called side leakage can be effectively prevented. Combined with the contour shape of the leak preventer 2, which is concavely curved and has slanted side walls, it has many effects such as excellent fitting to the wearer's body shape, and is extremely useful in practical use. .

[Brief explanation of the drawing]

Figure 1 is a plan view showing an embodiment of the napkin of the present invention, Figure 2 is a plan view showing an embodiment of the napkin of the present invention;
The figure is a side view of the same as above, Figure 3 is a sectional view taken along the line A-A in Figure 1, Figure 4 is the same sectional view as Figure 3 showing another embodiment, and Figure 5 is an example of the side flap of the leak preventer. 6th cross-sectional view showing
The figure is a plan view showing still another embodiment. 1... Napkin, 2... Leak preventer, 3... Absorber, 4... Top sheet, 5... Concavity, 6
, 7... Side wall, 8... Side flap. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Scope of Claims] 1. A leak preventer made of thermoplastic foam and having a concave portion except for the peripheral portion, and an absorbent body housed in the concave portion;
A sanitary napkin comprising at least a water-permeable top sheet covering the surface of the absorbent body, and at least the leak preventer and the water-permeable top sheet are bonded and integrated. 2. The sanitary napkin according to claim 1, wherein the concave portion of the leak preventer has a narrow center width. 3. The sanitary napkin according to claim 1, wherein the leak preventer has a narrow center width. 4. The sanitary napkin according to claim 1, wherein both lateral walls of the leak preventer have curved outer sides. 5. The sanitary napkin according to claim 1, wherein flaps are provided on both lateral walls of the leak preventer. 6. The sanitary napkin according to claim 5, wherein the flap is curved upward. 7. The sanitary napkin according to claim 1, wherein both longitudinal walls of the leak preventer are inclined so as to be gradually lowered toward the outer end. 8. The sanitary napkin according to claim 1, wherein the foamed plastic is singly foamed polyethylene.