JPH08322879A - Sanitary napkin - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] Providing a sanitary napkin that has a leak-proof effect that is guaranteed for a long time and the wide part is foldable, which is advantageous for manufacturing and individual packaging. A seat portion that corresponds to the outer shape of the sanitary napkin and has a substantially elongated shape along the front-back direction of the user's body, and corresponds to the rear portion of the user's body corresponds to the front portion of the body. The backsheet formed wider than the seat portion, the absorbent core 8 formed narrower than the front portion of the backsheet, and the backsheet arranged corresponding to a region where the absorbent core exists. A first adhesive layer provided on the side facing the underwear of the sheet,
A wide rear portion of the backsheet, which is arranged on both sides of the absorbent core in a region where the absorbent core does not exist and is provided on a side facing the underwear of the backsheet. And a second adhesive layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sanitary napkin that is worn on the body of a woman to absorb body fluid. More specifically, the present invention relates to a sanitary napkin in which a rear portion of the sanitary napkin is formed wider than a front portion thereof.

[0002]

2. Description of the Related Art Conventionally, a sanitary napkin has been used as a means for being worn on a female body and absorbing body fluid. Such a sanitary napkin is typically formed in the same width along the front-back direction of the user's body. Due to the uniformity of its width
The production efficiency was good, and the material was saved. However, it cannot be said that the liquid leakage is sufficiently prevented in the rear part of the user's body. That is, when using for a long time at bedtime at night, it is an important issue to prevent liquid leakage from the lying position to the rear part of the body. Therefore, a sanitary napkin in which a portion corresponding to a rear portion of a user's body is formed wider than a front portion is used.

In such a product, the rear part of the sanitary napkin is formed to be wide,
There is a problem in that the state of attachment to underwear becomes unstable, and the ends of the wide part of the underwear are curled up during use, and it is not possible to guarantee leakage prevention for a long time. In addition, when the sanitary napkin itself is individually wrapped, there is a wide part, so the individual wrapping itself becomes large, or if you try to fold the wide part and wrap it, keep the wide part folded until just before the packaging is completed. There is a problem in that it needs to be held and manufacturing is difficult.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a sanitary napkin capable of preventing liquid leakage by providing a wide portion to the rear part of the sanitary napkin.

Another object of the present invention is to provide a sanitary napkin in which a wide portion of a rear portion of the sanitary napkin can stably exert a liquid leakage effect for a long time during use of the sanitary napkin. Is.

Still another object of the present invention is to provide a sanitary napkin capable of folding and fixing a wide portion of a rear portion of the sanitary napkin.

[0007]

The sanitary napkin of the present invention comprises a liquid-permeable topsheet arranged on the side facing the user's body and a liquid-impermeable topsheet arranged on the side facing the undergarment. A backsheet, and a sanitary napkin comprising an absorbent core arranged between the sheets, the sanitary napkin conforming to the outer shape of the sanitary napkin and being substantially elongated along the longitudinal direction of the body of the user. A seat having a shape, the seat corresponding to the rear part of the user's body is wider than the seat corresponding to the front part of the body, and the absorbent part formed to be narrower than the front part of the backsheet. Elastic core, a first adhesive layer that is arranged corresponding to the region where the absorbent core is present and that is provided on the side facing the underwear of the backsheet, and a wide rear of the backsheet In part The 2 provided on the side facing the undergarment of the back sheet with both sides of the absorbent core are arranged corresponding to the region where there is no the absorbent core I
And a sanitary napkin is fixed to the inside of the underwear by the first adhesive layer, and a wide rear portion of the backsheet is spread in the underwear by the second adhesive layer. It is characterized by being held in a state.

[0008]

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

1 to 3 illustrate one embodiment of a sanitary napkin constructed according to the present invention. The napkin, generally designated by number 2, comprises a liquid-permeable topsheet 4, a liquid-impermeable backsheet 6, and an absorbent core 8 disposed between the topsheet 4 and the backsheet 6. There is. It is important that the topsheet 4 allows the body fluid discharged from the user to quickly permeate into the absorbent core 8 and does not give the wearer excessive discomfort when brought into contact with the wearer's skin. Yes, for example, woven or non-woven fabric made of natural or synthetic fiber, thermoplastic synthetic resin film having a large number of small holes, porous synthetic resin foam, reticulated synthetic resin foam, reticulated synthetic resin film or thermoplastic synthetic resin It can be conveniently formed from scrim or the like. It is important that the back sheet 6 has a function of preventing the liquid absorbed by the absorbent core 8 from flowing out of the napkin and contaminating the clothes of the user and / or the wearer. It can be conveniently formed from a liquid impermeable thermoplastic synthetic resin film. A particularly suitable film for forming the backsheet 6 has a thickness of 0.01
To 0.05 mm, especially about 0.025 mm, low density polyethylene film (such polyethylene film is available from Essil Corp.'s Bi-screen division under "Model XP-3").
9385 ”and from SOPE FLEX 140 from Kropey Corp. of Cincinnati, Ohio, USA.
1 ”). The absorbent core 8 disposed between the topsheet 4 and the backsheet 6 is discharged from the wearer and is discharged from the topsheet 4
It is important to have the function of absorbing and retaining the body fluid that has permeated the skin. Such absorbent cores 8 include, for example, shredded wood pulp called airfelt, creped cellulose wadding, meltblown polymers, chemically stiffened, deformed or crosslinked cellulose fibers, absorbent synthetics. It may be conveniently formed from a resin foam, a tissue paper layer, or an absorbent gelling (absorption of liquid into a gel) material or any suitable combination thereof.

In the illustrated embodiment, the shape of the top sheet 4 is substantially the same as the shape and size of the back sheet 6, and the top sheet 4 and the back sheet 6 are continuously heated over their entire peripheral edges. It is fused. The heat-fusing region 10 between the top sheet 4 and the back sheet 6 is shown by cross hatching in FIG. 1 for convenience of illustration, and is shown by hatching in FIG. If desired, the topsheet 4 and the backsheet 6 can be connected to each other in any other suitable manner, such as by adhesive bonding. As described above, the topsheet 4 and the backsheet 6 have the same shape, and therefore the shapes of these sheets match the outer shape of the napkin 2 itself. The absorbent core 8 is arranged along the longitudinal direction of the napkin 2 (vertical direction in FIG. 1) and has substantially the same width (horizontal direction length in FIG. 1) over the entire length in the longitudinal direction. Is formed.

An adhesive layer 3 for fixing the napkin 2 to the inner surface of the undergarment is provided on the outer surface of the back sheet 6 at a position substantially corresponding to the absorbent core 8. This adhesive is available from Century Adhesive Corp., Columbus, Ohio, USA.
ntury Adhesive A-305-IV "can be preferably used. When the adhesive layer 3 is applied to the outer surface of the backsheet 6, it is preferable to cover the adhesive with silicone-coated paper to prevent contamination of the adhesive before use.

The top sheet 4 and the back sheet 6 are
At a position slightly offset to the front in the longitudinal direction of the napkin 2 (the front means upward in FIG. 1), the absorbent core 8 is
From the side edge 8a of the No. 1 to the outside in the lateral direction. The wing 12 is attached to the napkin 2 by this protrusion. When using the napkin 2, this wing 12
Used by folding around the crotch area of underwear. An adhesive layer 14 for fixing the wing 12 to the undergarment can be provided on the back surface of the wing 12, that is, the side facing the undergarment of the back sheet 6, if necessary. Top sheet 4
Further, the back sheet 6 further projects laterally outward from the side edge 8a of the absorbent core 8 in the longitudinal rear region of the napkin 2. This protruding portion constitutes a wide portion 16 at the rear side in the longitudinal direction of the napkin 2 (rear side means downward in FIG. 1) to prevent leakage. By forming the wide portion 16 at the rear portion of the napkin 2, that is, the region corresponding to the hip portion of the user's body, the leakage prevention effect in this region can be further enhanced.

As a result of the above construction, the wing 12 and the wide portion 16 on the side edge 8a of the absorbent core 8 are formed.
A constricted portion 18 is formed between and. When the napkin 2 is used, the wing 12 is folded back around the underwear so that the napkin 2 is substantially the front edge 2 of the napkin 2.
The width from 0 to the constricted base portion 22 of the constricted portion 18 becomes substantially the same width along the longitudinal direction, and the width gradually increases from the constricted base portion 22 toward the rear side in the longitudinal direction of the napkin 2.

As described above, the top sheet 4 and the back sheet 6 are heat-fused in the heat-fusing region 10. By this fusion, the topsheet portion and the backsheet portion located outside the front edge and the rear edge of the absorbent core 8 and outside the side edge of the absorbent core 8 are fused and fixed to each other. Further, the root portions 24 and 26 of the wings 12 and the wide portion 16 on the outer side of the side edge 8a of the absorbent core 8 are heat-sealed (in FIG. 1 and FIG. 2, the heat-sealing area is shown by hatching). . By these heat fusion, the top sheet 4 and the back sheet 6 along the outer peripheral edge of the absorbent core 8 can be substantially fixed to each other. By this fixing, the absorbent core 8 can take a stable position inside the napkin 2.

As described above, the absorbent core 8 has substantially the same width along the longitudinal direction of the napkin 2. The shape of the absorbent core contributes to reducing the number of cut-off portions in manufacturing the napkin and reducing the manufacturing cost. Therefore, the absorbent core 8 does not exist in the region corresponding to the wing 12 and the region corresponding to the wide portion 16. The absence of an absorbent core within the wings 12 is advantageous in that the wings 12 do not become too stiff and the wings 12 are flexible enough to be easily folded. However, the fact that there is no absorbent core in the wide portion 16 reduces the rigidity of the wide portion 16. In order to compensate for this inconvenience due to the reduction in rigidity, an adhesive layer 28 is provided on the side of the wide portion 16 facing the underwear of the back sheet 6. In use of the napkin, the widened portion 16 is unrolled within the undergarment and adheres the adhesive 28 to the inner surface of the undergarment. The adhesive 28 is applied to the wide portion 16
To prevent flipping up due to contact with the user's body.

FIG. 3 shows a state in which the wing 12 and the wide portion 16 of the sanitary napkin of the embodiment shown in FIG. 1 are folded. As shown in FIG. 3, the wing 12 and the wide portion 16 are respectively folded back to the top sheet 4 side. The adhesive 14 provided on the wings 12 is covered with a release paper 30 whose surface is coated with a release agent such as silicone, and the left and right wings 12 are connected to each other. The adhesive 28 provided on the wide portion 16 is also covered with a release paper 32 having a surface coated with a release agent such as silicone, and the left and right wide portions 16 are connected to each other.

As described above, the width of the napkin 12 can be reduced by folding back the portion protruding laterally outward from the absorbent core 8, that is, the wing 12 and the wide portion 16 toward the top sheet 4 side. As a result, the individual wrapping of the napkin 12 can be reduced. Also, the wings 1 projecting outward from both sides of the absorbent core 12.
Since the 2 and the wide portion 16 can be connected by the release paper, it is not necessary to press and convey them on the production line, and the production line can be simplified.

In the above embodiment, the adhesive 3 for fixing the main body of the napkin 2 to the underwear and the adhesive 28 for preventing the wide portion 16 from curling up are separately provided. However, instead of this Then, the adhesive 3 and the adhesive 28 may be connected together. In any case, the wide portion 16
It is important to provide an adhesive layer on the back surface of the back sheet corresponding to the area where the absorbent core 8 does not exist.
Other various design changes are possible within the scope of the present invention.

[0019]

The sanitary napkin of the present invention is constructed as described above, so that the wide portion located at the rear portion of the sanitary napkin is fixed to the inner surface of the underwear through the adhesive layer, so that it can be used. It does not turn up inside and can contribute to leakage prevention in a stable manner for a long time.
Further, there is no absorbent core in the wide portion located at the rear portion of the sanitary napkin, and therefore, even when the wide portion does not have sufficient rigidity, there is no fear of curling up during use.

[Brief description of drawings]

FIG. 1 is a top view of a sanitary napkin according to an embodiment of the present invention.

FIG. 2 is a sectional view of the sanitary napkin of FIG. 1 taken along the line II-II.

FIG. 3 is a top view showing a state in which the sanitary napkin of FIG. 1 is folded.

[Explanation of symbols]

 4 Top sheet 6 Back sheet 8 Absorbent core 12 Wing 14 Adhesive 16 Wide part 28 Adhesive 30, 32 Release paper

Claims (6)

[Claims] 1. A liquid-permeable topsheet arranged on the side facing the user's body, a liquid-impermeable backsheet arranged on the side facing the undergarment, and arranged between the two sheets. A sanitary napkin having an absorbent core, which has a substantially elongated shape that matches the outer shape of the sanitary napkin along the front-back direction of the user's body, and is located in the rear part of the user's body. A backsheet in which the corresponding sheet portion is formed wider than the sheet portion corresponding to the front portion of the body, an absorbent core formed narrower than the front portion of the backsheet, and a region where the absorbent core is present. A first adhesive layer that is disposed in correspondence with the backsheet and that is provided on the side facing the underwear of the backsheet; and a wide rear portion of the backsheet that is on both sides of the absorbent core. Absorbability A second adhesive layer disposed on a side facing the undergarment of the back sheet, the sanitary napkin being inside the undergarment, the second adhesive layer being disposed corresponding to a region where the core does not exist. The sanitary napkin, which is fixed to the underwear, and in which the wide rear portion of the backsheet formed by the second adhesive layer is held in an expanded state in the undergarment. 2. The sanitary napkin according to claim 1, wherein the absorbent core has substantially the same width along the front-back direction of the user's body. 3. The sanitary napkin according to claim 1, wherein the topsheet is fixed to the backsheet along the outer peripheral edge of the absorbent core. 4. The sanitary napkin according to claim 1, wherein the top sheet has the same outer shape as that of the back sheet, and the outer peripheral edges of the top sheet are fixed to each other. 5. The physiology according to claim 1, wherein the wide rear portion of the backsheet is folded back toward the center line in the longitudinal direction of the sanitary napkin, and release paper is attached to the adhesive layer. Napkin. 6. A portion of the backsheet portion corresponding to the front portion of the user's body extends laterally outwardly from opposite sides of the absorbent core and is thereby folded back along the crotch region of the undergarment. The wing portion is formed, and the wing portion is formed.
The sanitary napkin described.