JPH05154176A - Sanitary napkin - Google Patents

Abstract

PURPOSE:To provide the sanitary napkin having an excellent property to prevent liquid leakage, wearing feel and wearing property. CONSTITUTION:The physiological napkin is formed with a pair of flaps 20 respectively extending outward from the center in both side parts of a central absorber part 10 by laminating the extended parts extended in such a manner that a back sheet 2 and a top sheet 1 forming the central absorber part 10 form the substantially same plane shape and by joining the entire circumferential marginal region A thereof. The side marginal region B of the top sheet 1 existing on both side edges of the central absorber part 10 is formed as a non- perforated rugged part 12 and the boundary region C is formed as a non- perforated region C. The flap central region E existing between the region A and the region C is formed as the non-perforated rugged part and the flap is not joined to the back sheet 2 in the region E.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sanitary napkin having a high degree of leakproofness, and more particularly to a sanitary napkin having side flaps for preventing misalignment during use and leakage of menstrual blood.

[0002]

2. Description of the Related Art A sanitary napkin having a side flap (flap) has a function of stably fixing the napkin to a crotch portion of shorts by the side flap. It is said that it has an effect of making the shorts less likely to be soiled as compared with those that do not have, and the psychological effect that the wearer has such an effect regardless of whether or not the effect is actually exhibited. It has been prized for giving a sense of security.

A typical publication describing a sanitary napkin having a side flap is Japanese Patent Laid-Open No. Sho 60.
-75058, JP-A-64-70050, and the like. In the sanitary napkin described in JP-A-60-75058, the flap is flexible, and a side wall (liquid leakage) is formed by using the flap to form a leak-proof wall when used. ) Is to prevent.

However, when the above-mentioned sanitary napkin is used, the possibility of forming a leak-proof wall by the flap is considered to be due to the very limited use of the sanitary napkin (limited to the wearer). Body shape, limited interrelationship between the crotch part of the shorts and the napkin, etc.), and even in this case, since the crotch part of the wearer is narrow, the leak-proof wall often collapses.

Therefore, it is difficult to effectively prevent liquid leakage with such a conventional sanitary napkin. Also, JP-A-64-70
No. 050, a liquid-permeable top sheet made of a three-dimensionally perforated plastic film arranged from a central absorbent body portion having an absorbent body to a flap, and a liquid-impermeable material having substantially the same plane shape as the top sheet. Disclosed is a sanitary napkin in which a back sheet is heat-sealed with an outer contour line (entire peripheral region) and a seal portion is provided at a boundary between a central absorbent body portion and a flap.

However, in the above sanitary napkin, the top sheet other than the seal portion has holes (three-dimensional perforation).
Since the menstrual blood has been formed, the menstrual blood absorbed by the absorber returns to the top sheet at the opening near the seal portion, gets over the seal portion, and contaminates the flaps and shorts. Therefore, it is difficult to effectively prevent liquid leakage even with such a conventional sanitary napkin.

Further, none of the above sanitary napkins has a problem that the feel on the skin during wearing is not satisfactory and the wearing feeling is poor. Furthermore,
The conventional sanitary napkin having the side flaps has a problem that it is difficult to be accurately and easily attached to the crotch portion of the shorts, and it is likely to be displaced or twisted during wearing, resulting in poor wearability.

The conventional sanitary napkins having side flaps other than the above have problems in at least one of liquid leakage prevention property, wearing feeling and wearability.
Therefore, an object of the present invention is to provide a sanitary napkin having excellent liquid leakage prevention properties, wearing feeling and wearing properties.

[0009]

The present invention has achieved the above object by providing the following sanitary napkins. A liquid-impermeable backsheet, an absorbent body mainly composed of pulp fibers and a super-absorbent polymer, and a central absorbent body part formed by a liquid-permeable topsheet composed of a perforated plastic film, and the central absorbent body part A pair of flaps extending outward from the center of both side portions, the pair of flaps such that the back sheet and the top sheet forming the central absorbent body portion have substantially the same plane shape. Is formed by laminating the extended portions extended to each other and joining all the peripheral edge regions thereof, and an adhesive layer and a release sheet covering the surface thereof are arranged on the outer surface of the back sheet. In the sanitary napkin, in the topsheet, the side edge regions located on both side edges of the central absorbent body portion are made into the non-opened concavo-convex portions, and the flank of the side edge region is formed. The boundary region from the edge near the pull to the flap is a non-opening part, is joined to the backsheet in the boundary region, and is located between the entire peripheral region and the boundary region. A sanitary napkin, characterized in that the flap central region is made into a non-perforated concavo-convex portion and is not joined to the back sheet in the flap central region.

[0010]

The function of the sanitary napkin of the present invention is as follows.
After peeling off the release sheet, the central absorbent part is fixed at a predetermined position on the inner surface of the crotch part of the shorts with an adhesive layer, and the flap is bent so as to sandwich the shorts, and the flap is clad with the adhesive layer. Fix on the outer surface. The sanitary napkin of the present invention is formed with uneven portions in the side edge region and the flap region, the uneven portion is not formed in the boundary region between these regions, the boundary region is a seal portion. In addition, since the top sheet and the back sheet are combined in the entire peripheral area, the above-mentioned mounting operation can be performed accurately and easily.

While wearing the shorts to which the sanitary napkin of the present invention is attached as described above, the top sheet in the side edge region of the sanitary napkin is a non-perforated uneven portion, so It is prevented that the bodily fluid absorbed in the body will return to the top sheet at the opening near the seal part, and will not get over the seal part to contaminate the flaps and shorts. The part prevents the transfer to the flap part, and the seal part restricts the movement of the absorbent body, thereby preventing the absorbent body from being displaced or twisted.

Further, during wearing of the shorts to which the sanitary napkin of the present invention is worn, since the uneven portions are formed in the side edge region and the flap central region, respectively, a good feeling is given to the skin.

[0013]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 is a perspective view of a sanitary napkin according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the sanitary napkin shown in FIG. 1, and FIG. 3 is a cross-sectional view showing a state in which the sanitary napkin shown in FIG. 1 is attached to shorts. It is a figure.

The sanitary napkin according to the present embodiment comprises a liquid impermeable back sheet 2, an absorbent body 3 mainly composed of pulp fibers and a super absorbent polymer, and a liquid permeable top sheet 1 made of a perforated plastic film. The center absorbent body portion 10 is provided with a pair of flaps 20 extending outward from the center of both side portions of the center absorbent body portion 10. The pair of flaps 20 includes the center absorbent body portion 10. The back sheet 2 and the top sheet 1 forming a sheet are formed by stacking extended portions extending so as to form a substantially coplanar shape, and joining all peripheral edge regions A thereof, and On the outer surface of the back sheet 2, the pressure-sensitive adhesive layer 4 and the release sheet 6 that covers the surface thereof are arranged.

Therefore, the top sheet 1 in the sanitary napkin of this embodiment is formed of a perforated plastic film having an opening portion in the central surface portion (skin contact portion) of the central absorbent body portion 10. The major feature is that the following requirements are met. The perforated plastic film is liquid impermeable except for the perforated portion.

The side edge regions B located on both side edges of the central absorbent body portion 10 are made into non-perforated uneven portions (embossed portions) 12, and the edge portions of the side edge region B near the flap 20 are formed. The boundary region C from the flap to the flap is a non-perforated part, is joined to the backsheet 2 in the boundary region C, and is located between the entire peripheral region A and the boundary region C. The flap central region E is formed as a non-perforated concave-convex portion 21, and the back sheet 2 is formed in the flap central region E.
Is not joined with.

The raw materials for the backsheet, absorbent body and topsheet of the sanitary napkin of this embodiment are not particularly limited, and those used for ordinary sanitary napkins are used. Is used.
As the back sheet 2, a liquid-impermeable and vapor-permeable vapor sheet that is made by adding a filler to a thermoplastic resin and stretched is used, and has a feeling close to that of underwear, such as a film and a nonwoven fabric. Or a composite material of film and woven cloth is used.

The absorbent body 3 is preferably composed mainly of defibrated pulp and a high-molecular water-absorbing polymer,
In addition, a mixture of a thermoplastic resin, a cellulose fiber, and a high-molecular water-absorbing polymer, which is heat-treated, is preferable. The high molecular weight water-absorbing polymer may be a mixture with pulp, and the high molecular weight water-absorbing polymer has a retaining property capable of absorbing and retaining a liquid of 20 times its own weight or more, and has a gelling property. Particles having are preferable, and as such a high molecular weight water-absorbing polymer, starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, crosslinked sodium carboxymethyl cellulose, acrylic acid ( Salts) and the like are preferable.

Examples of the top sheet 1 include polyolefins, copolymers of olefins and other vinyl monomers such as acrylic acid ester and vinyl acetate, and hydrophobic thermoplastic resin sheets such as polyester and polyamide.
Of these, a hydrophobic thermoplastic resin sheet of a polyolefin or a copolymer of an olefin and another monomer, or a polymer blend-based hydrophobic thermoplastic resin sheet is preferable from the viewpoint of texture and handling.

Next, the top sheet 1 of the sanitary napkin of the present invention will be described. The central absorbent body portion 10 of the top sheet 1 is located above the absorbent body 3, and the central absorbent body portion 10 is provided with a perforated portion in which an opening 13 is formed. The width BW is approximately the same as the width of the absorber 3, but is preferably 50 to 80 mm.

The pore density of the pores 13 is limited by the liquid permeation and liquid return prevention properties. When the pore density is small, the liquid permeability is substantially inferior, but as the pore density increases, the sheet forming property deteriorates. In consideration of 10 pieces / cm ^{2 to} 100 pieces / cm ²
Is preferable, and 30 pieces / cm ^{2 to} 60 pieces / cm ² are more preferable. Side edge regions B located on both side edges of the central absorbent body portion 10
Is a non-opening concavo-convex portion. The side edge region B extends from the side portion of the upper surface of the absorber 3 to the side edge surface, and more specifically, the width _BL of the upper surface of the absorber 3 in the side edge region B and the absorption It has a dimension B _D from the upper surface of the body 3 to the side edge surface (before the back sheet 2). The width _BL is preferably 2 to 10 mm, and the dimension _BD is 3 to 8
mm is preferred.

In the side edge region B of the top sheet 1, unlike the central absorbent body portion 10, no opening is formed and only the uneven portion 12 is formed. Thus, the side edge region B
Since the opening 13 is not formed in the top sheet 1, the liquid leakage from such a portion can be prevented and the liquid can be prevented from flowing out to the flap 20. The concavo-convex portion 12 formed in the side edge region B can be formed into a desired shape by arbitrarily selecting an emboss pattern. The depth of the uneven portion 12 is preferably 0.1 to 1.0 mm. 1.0
If it is larger than mm, the roughness on the skin increases, and
If it is less than mm, the stickiness to the skin increases.

The boundary area C of the top sheet 1
2 extends in a straight line from the side edge region B toward the flap 20 in the deployed state shown in FIG. This boundary area C
In the present embodiment, the uneven portion is not formed, but extremely small unevenness may be formed. By forming the boundary region C flat as described above, it is possible to easily bend the boundary region C and improve the fit to the wearer.

In addition, the width of the boundary region C is formed to have a size substantially equal to the thickness of the crotch portion of the shorts in this embodiment. By forming the crotch portion to have a size substantially equal to the thickness of the crotch portion, the boundary region C is formed between the side edge region B and the flap region E as shown in FIG.
It can be easily folded along the thickness of the crotch part.

The width of the top sheet 1 in the boundary region C is preferably 5 to 20 mm, particularly preferably 8 to 15 mm. In the boundary region C, the top sheet 1 is adhered to the back sheet 2 by the seal portion 14. A known means is used for the seal portion 14, and for example, hot melt, heat seal, ultrasonic fusion, or the like is used.

By adhering the top sheet 1 and the back sheet 2 in the boundary region C in this manner, it is possible to prevent the excretion liquid from moving from the side edge of the absorbent body 3 to the flap 20. The entire area A of the top sheet 1 is along the periphery of the napkin,
The top sheet 1 is joined to the back sheet 2, and the width of the entire peripheral region A is 3 to 15 mm, and preferably formed substantially uniformly.

[0027] Since it is surrounded and held by a part of the entire peripheral area A located in front of and behind the absorbent body 3 and the seal portion 14 located on the side portion of the absorbent body 3, the absorbent body 3 absorbs during wearing. The "wrinkle" and "shift" of the body 3 are prevented.
On the other hand, the flaps 20 that extend outward from the center of both sides of the central absorbent body 10 are configured by combining the top sheet 1 and the back sheet 2, and only the periphery thereof is joined as a part of the entire peripheral area A. The flap center region E is not joined. This flap central area E
Then, the uneven portion 21 is formed on the top sheet 1,
Cushioning and good feel are given. The depth of the uneven portion 21 is preferably 0.1 to 1.0 mm. If it is larger than 1.0 mm, the roughness on the skin increases, and if it is smaller than 0.1 mm, the stickiness on the skin increases.

The shapes, sizes, and depths of the concavo-convex portions of the side edge region B and the central region E do not necessarily have to be the same.
With the above-described configuration, the flap 20 has a volume feeling and is flexible. Further, the flap 20 has no opening formed in the top sheet 1,
Moreover, since it is partitioned from the absorber 3 by the above-described seal portion 14, it is possible to relieve the stress in the width direction during wearing and prevent the central absorber portion 10 from being damaged.

[0029]

EFFECTS OF THE INVENTION The sanitary napkin of the present invention is excellent in prevention of liquid leakage, wearing feeling and wearing feeling. That is, the sanitary napkin of the present invention specifically has the following effects. Since the top sheet of the side edge region B is the non-opened concave and convex portion 12, liquid leakage from the side edge region B is prevented, and body fluid returning to the opening 13 of the top sheet is uneven in the side edge region B. Liquid is prevented from flowing over the portion 12 to the flap 20.

Since both side edges of the boundary region C respectively form a boundary line between the uneven portion 12 and the non-uneven portion, the flap 20 can be easily bent at these two boundary lines, particularly the boundary line on the flap side. , The sanitary napkin with its boundary area C
Can be attached to the crotch part of the shorts accurately and easily according to the thickness of the shorts. Since the top sheet in the side edge region B and the flap center region E that are in contact with the legs of the wearer are provided with the uneven portions 12 to make the surface of the top sheet 1 in the regions soft, a good wearing feeling can be obtained.

In the boundary region C, since the top sheet 1 and the back sheet 2 are joined (sealed), movement of body fluid from the side edge of the absorbent body 3 between the sheets of the flap 20 is prevented, and the absorbent body Movement is prevented. Since the absorbent body 3 is surrounded and held by a part of the entire peripheral region A located in front of and behind the absorbent body 3, and the seal portion 14 located on the side of the absorbent body 3, “twist” of the absorbent body 3 during wearing, "Displacement" is prevented.

The flap 20 is formed of two layers, a top sheet 1 and a back sheet 2, and a concavo-convex portion 21 is formed in the top sheet 1 in the flap central region E, and only the periphery of the flap 20 is joined. Therefore, it is voluminous and rich in flexibility, and a good wearing feeling can be imparted. Since the top sheet 1 of the flap 20 is a non-open hole and has a sealing portion between the top sheet 1 and the absorber 3, stress in the width direction at the time of wearing and during wearing is relaxed, and the flap does not break.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view of the sanitary napkin shown in FIG.

FIG. 3 is a cross-sectional view showing how the sanitary napkin shown in FIG. 1 is attached to shorts.

[Explanation of symbols]

 1 Top Sheet 2 Back Sheet 3 Absorber 4 Adhesive Layer 10 Central Absorber Part 12 Unopened Concavo-convex Part 13 Opening A All Peripheral Area B Side Edge Area C Border Area E Flap Central Area

Claims (3)

[Claims] 1. A central absorbent body formed by a liquid-impermeable backsheet, an absorbent body mainly composed of pulp fibers and a superabsorbent polymer, and a liquid-permeable topsheet composed of a perforated plastic film, A pair of flaps extending outward from the center of both side portions of the central absorbent body, wherein the pair of the flaps have the backsheet and the topsheet forming the central absorbent body substantially in the same plane. A release sheet that is formed by laminating extension portions that extend so as to form a shape, and joining all peripheral edge regions thereof, and an adhesive layer on the outer surface of the back sheet and a surface that covers the pressure-sensitive adhesive layer. In the sanitary napkin in which is arranged, in the topsheet, the side edge regions located on both side edges of the central absorbent body portion are made into non-opened concavo-convex portions, The boundary region from the edge of the region near the flap to the flap is a non-perforated part, and is joined to the backsheet in the boundary region, and between the entire peripheral region and the boundary region. A sanitary napkin characterized in that the flap central region located at is formed into a non-opened concavo-convex portion, and is not joined to the back sheet in the flap central region. 2. The sanitary napkin according to claim 1, wherein the side edge region extends from the side portion of the upper surface of the absorbent body to the side edge surface. 3. The sanitary napkin according to claim 1, wherein the width of the boundary region is substantially equal to the thickness of the crotch portion of the shorts.