JPS63230164A - Sanitary napkin - 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 [Industrial Field of Application] The present invention relates to a sanitary napkin used for absorbing and retaining menstrual blood.

[Conventional technology]

Conventionally, sanitary napkins have been provided with elastomers for pressing and sealing both lateral edges against the wearer's skin, as disclosed in Japanese Patent Laid-Open No. 60-193461 and Utility Model Laid-Open No. 59-18.
No. 4820, No. 61-36618, No. 61-5181
It is disclosed in No. 2.

[Problem that the invention seeks to solve]

Napkins belonging to any of the above-mentioned known forms have their laterally opposed sides erected by the elastomer on their laterally opposed side edges, and the entire napkin is curved into a boat shape. However, the standing state on the side opposite to each other is not sufficient, and to achieve a sufficient standing state, it is necessary to increase the contractile force of the elastomer.

If it is made too strong, the absorbent core will become irregularly or even unnaturally deformed and wrinkled due to stress distortion. Therefore, the effect of using the elastomer cannot be fully achieved.

The present invention aims to overcome the aforementioned disadvantages of sanitary napkins with elastomer on the laterally opposed side edges.

(2) Structure of the invention [Means for solving the problems] The gist of the present invention is to provide a water-permeable top sheet,
A water-impermeable backsheet, a semi-rigid absorbent core interposed between the two sheets, highly flexible side flaps located on both sides of the core in the lateral direction, and elastic gears in the longitudinal direction of the side flaps. A sanitary napkin comprising an elastomer made of a sanitary napkin, the sanitary napkin comprising: a) the side flap comprising a first flap and a second flap located on the upper surface thereof;

b) the first flap extends outward from both sides of the core in the lateral direction, and C) at least one edge of the second flap along the longitudinal direction is connected to the first flap; d) the elastomer is bonded and fixed to the front and back regions of the napkin with its other side edges facing outward; The napkin is located at the free end of the second flap in the central region.

(Embodiments) The embodiments of the present invention will be described as follows.

As shown in Figures 1 to 3, the napkin.

Water-permeable top sheet 11 and water-impermeable back sheet 12
, a semi-rigid absorbent core 13 , and side flaps 14 . The side flap 14 consists of a first flap 16 and a second flap 17. The first flap 16 is made up of portions of the top sheet 11 and back sheet 12 extending outward from both lateral edges of the core 13, and a portion of the second flap 17. The second flap 17 overlaps the upper surface of the first flap 16, and their overlapping outer portions are joined to each other. The unjoined inner portion of the second flap 17 is folded back to the outside, and this folded portion 17a is fixedly joined to the front region 18 and the rear region 19. The second flap 1 is a folded part located in the central region 20 between the front and rear regions 18 and 19.
An elastomer 21 is attached to the free end of the flap 7 so as to extend in its length direction, and is covered with the edge 22 of the second flap 17 in a bag-like manner. A recessed notch 23 is formed on the outside of the first flap 16.

The top sheet 11 is made of a fibrous non-woven fabric, a porous plastic film, etc., and the back sheet 12 is made of a plastic film, a laminate sheet of the film and a fibrous non-woven fabric, or the like. In the case of the laminate sheet, the nonwoven fabric is used on the outer surface. The plastic film used as the back sheet 12 is preferably breathable and waterproof, but if the napkin is provided with a means for ventilation inside and outside, it may be non-breathable. No. 13 uses a mat-like material in which superabsorbent polymer particles are mixed or not mixed with fluff pulp, and is semi-rigid because it is made from such a material and has a shape. As for the elastomer 21, thread-like or tape-like rubber, tape-like plastic foam, plastic film showing elasticity by heat treatment, etc. are used.

Since these materials have conventionally been commonly used in sanitary napkins and disposable diapers, it will be extremely easy for those skilled in the art to select them as appropriate.

The first flap 16 is formed by portions of the top sheet 11 and back sheet 12 extending outward from both lateral edges of the core 13, and a portion of the second flap 17. The second flap 17 is formed of a breathable and waterproof sheet, and its material is preferably a fibrous nonwoven fabric treated with water repellent treatment, for example, with silicone resin. As shown in FIGS. 4 and 5, a wide top sheet 11 and a back sheet 12 are used to form the side flaps 14,
These outer portions may be folded back. However, if the top sheet 11 and the back sheet 12 are separate sheets made of different materials, there are advantages that cannot be obtained when the side flaps 14 are formed from the extended portions of the top sheet 11 and the back sheet I2. For example, even when a breathable material is used for the backsheet 12, the side flaps 14 can be formed of a material with higher breathability to reduce stuffiness inside the napkin. Also.

Even if the highly breathable material is relatively expensive,
The side flaps 14, especially the second flaps 17, may be narrower than the backsheet 12.

It is not economically disadvantageous.

In the embodiment shown in FIG. 6, the second flap F is sandwiched between each portion of the top sheet 11 and back sheet 12 forming the first flap 16 on one side along the longitudinal direction, and A folded part 17a which is folded back and joined to the upper surface, and whose other unjoined side is folded back outwards, and which is formed by joining both longitudinal ends of the folded part 17a, and which is not joined. An elastomer 21 is attached to the elastomer 21.

The second flap 17 in the embodiment shown in FIG. 7 is formed by joining the inner side and both longitudinal ends of the first flap 16 while superimposed on the upper surface of the first flap 16, and the second flap 17 is overlapped with the upper surface of the first flap 16. Elastomer 2 on part 17a
1 is attached. The material of the second flap 17 is the same as that of the second flap shown in FIGS. 1 to 3.

In the napkin configured as described above, when the elastomer 21 is contracted, the second flap 1
7 stands up. However, since the napkin is being stretched in the longitudinal direction, if the elastomer 21 is sufficiently stretched, the second flap 17 will fall outward. Therefore, also if the elastomer 21 is stretched to such an extent, the second flap 17 will tilt outward at an angle without completely lying down. The reason why the second flap 17 rises, falls down, and inclines according to the degree of elongation of the elastomer 21 is that the outer edge of the second flap 17, where the elastomer 21 is located, is directed outward. This is because both longitudinal ends of the flap are fixed to the front region 18 and the rear region 19, and the elastomer 21 has a predetermined stretching force.

(3) Effects of the Invention In the napkin of the present invention, the second flap located on the upper surface of the first flap is fully compressed by the contraction force of the elastomer, using the proximal line that intersects with the first flap as a fulcrum. This is because the contractile force acting on the second flap is reduced or suppressed on the proximal line and is substantially converted into an erecting action. The contractile force rarely exceeds the proximal end line toward the core. That is, there is no adverse effect due to the interaction between the contraction force of the elastomer and the rigidity of the core. Therefore, according to the napkin of the present invention, the outside of the required local area can be effectively sealed to prevent side leakage of menstrual blood. Can be done.

[Brief explanation of drawings]

The drawings show an embodiment of the napkin according to the present invention, and FIG. 1 is an external perspective view, FIG. 2 is a sectional view taken along line 2-2 in FIG. 1, and FIGS. 3 to 7 are side portions. FIG. 11...Top sheet 12...Back sheet 1
3...Core 14...Side flap 1
6...First flap 17...Second flap 18
... Front area 19... Back area 20...
Central region 21... Elastomer No. 1 Fig. 2 Fig. 3 Fig. 7a

Claims (4)

[Claims] (1) a water-permeable top sheet, a water-impermeable back sheet, a semi-rigid absorbent core interposed between the two sheets, highly flexible side flaps located on both sides of the core in the lateral direction; an elastomer forming stretch gathers in the longitudinal direction of the side flaps, the sanitary napkin comprising: a. the side flap includes a first flap and a second flap located on the upper surface thereof; b. the first flap extends outwardly from both lateral sides of the core; c. The second flap has at least one edge along the longitudinal direction connected to the first flap, and
both longitudinal ends thereof are joined and fixed to the front and rear regions of the napkin with the other side edges facing outward; d. The napkin characterized in that the elastomer is located at the free end of the second flap in the central region between the front region and the rear region. (2) The napkin according to claim 1, wherein the first flap is formed by a portion of the top sheet and the back sheet that extend outward from the outer edge of the core. (3) The napkin according to claim 1, wherein the outsides of the first and second flaps in the central region are notched. (4) The elastomer is contained in a bag portion formed at the free end of the second flap.
Napkins as described in section.