JP3091283B2 - Sanitary napkin - Google Patents

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 leak-proof property, and more particularly to a sanitary napkin having a side flap for preventing displacement 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 the shorts have an effect that is less likely to be soiled than those that do not have the effect, and regardless of whether or not the effect is actually exerted, the psychological effect that the effect is exerted on the wearer is given. It has been awarded for giving a sense of security.

A representative publication describing a sanitary napkin having a side flap is disclosed in
-75058 and JP-A-64-70050. According to the sanitary napkin described in Japanese Patent Application Laid-Open No. 60-75058, the flap is flexible, and when used, the flap forms a leakage-preventing wall during use. ).

[0004] However, when the above-mentioned sanitary napkin is used, the possibility of forming the leak-proof wall by the flap is considered because the use of the sanitary napkin is very limited (limited to the wearer). In this case, a limited body shape, a limited interrelation between the crotch part of the shorts and the napkin, etc.). In this case, too, the crotch part of the wearer is narrow, so that the leak-proof wall often collapses.

[0005] Accordingly, it is difficult to effectively prevent liquid leakage with such a conventional sanitary napkin. Japanese Patent Application Laid-Open No. 64-70
No. 050 discloses a liquid-permeable topsheet made of a three-dimensionally perforated plastic film disposed from a central absorber portion having an absorber to a flap, and a liquid-impermeable topsheet having substantially the same planar shape as the topsheet. A sanitary napkin is disclosed 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 portion and a flap.

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

Further, any of the sanitary napkins described above has a problem that the feel to the skin during wearing is not satisfactory and the wearing feeling is inferior. Furthermore,
The conventional sanitary napkin having the side flaps has a problem in that it is difficult to accurately and easily attach the sanitary napkin to the crotch portion of the shorts, and is liable to be displaced or twisted during wearing.

[0008] Sanitary napkins having conventional side flaps other than those described above have problems in at least one of liquid leakage prevention, wearing feeling, and wearability.
Accordingly, an object of the present invention is to provide a sanitary napkin excellent in liquid leakage prevention, wearing feeling, and wearability.

[0009]

The present invention has achieved the above object by providing the following sanitary napkin. A liquid-impermeable backsheet, an absorbent mainly composed of pulp fibers and a superabsorbent polymer, and a central absorbent portion formed by a liquid-permeable topsheet made of a perforated plastic film; A pair of flaps extending outward from the center of both sides, respectively, such that the backsheet and the topsheet forming the central absorber form substantially the same planar shape. The backing sheet is formed by laminating the extending portions extended to each other and joining all the peripheral regions thereof, and a pressure-sensitive adhesive layer and a release sheet covering the surface thereof are arranged on the outer surface of the back sheet. In the sanitary napkin, the top sheet has side edge regions located on both side edges of the central absorbent portion serving as non-opening concave and convex portions. A boundary region from the edge close to the flap to the flap is a non-opening portion, is joined to the back sheet at the boundary region, and is located between the entire peripheral region and the boundary region. A sanitary napkin, wherein a flap central region is formed as a non-opening uneven portion, and is not joined to the back sheet in the flap central region.

[0010]

When the sanitary napkin of the present invention is worn,
After peeling off the release sheet, the central absorber portion is fixed at a predetermined position on the inner surface of the crotch portion of the shorts with an adhesive layer, and the flap is bent so as to sandwich the shorts, and the flap is folded with the adhesive layer to form the crotch portion of the shorts. Secure to the outer surface. In the sanitary napkin of the present invention, uneven portions are formed in the side edge region and the flap region, and no uneven portion is formed in a boundary region between these regions. The mounting operation can be performed accurately and easily because the top sheet and the back sheet are combined in the entire peripheral area.

In addition, when the shorts on which the sanitary napkin of the present invention is mounted as described above, the top sheet in the side edge region of the sanitary napkin is a non-perforated uneven portion, so that the absorbent body is not used. The bodily fluid absorbed by the absorbent body is prevented from returning to the top sheet and climbing over the seal portion to contaminate the flaps and shorts in the opening near the seal portion. The portion prevents the transition to the flap portion, and further, the movement of the absorber is restricted by the seal portion, thereby preventing the absorber from being displaced or twisted.

Furthermore, when the shorts with the sanitary napkin of the present invention are worn, the unevenness is formed in each of the side edge region and the flap center region, so that a good feel 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 of the sanitary napkin shown in FIG. FIG.

The sanitary napkin according to the present embodiment comprises a liquid-impermeable back sheet 2, an absorbent 3 mainly composed of pulp fibers and a high-absorbent polymer, and a liquid-permeable top sheet 1 made of a perforated plastic film. It has a central absorbent body 10 formed and a pair of flaps 20 extending outward from the center of both sides of the central absorbent body 10, respectively. The back sheet 2 and the top sheet 1 are formed by laminating extended portions extending so as to form substantially the same planar shape, and joining the entire peripheral area A thereof, and On the outer surface of the back sheet 2, a pressure-sensitive adhesive layer 4 and a release sheet 6 covering the surface thereof are arranged.

Thus, the top sheet 1 in the sanitary napkin of the present embodiment is formed of a perforated plastic film having an opening at the center surface (skin contact portion) of the central absorber 10. There is a great feature in that the following requirements are satisfied. The above-mentioned perforated plastic film is liquid-impermeable except for the perforated portion.

Side edge regions B located on both side edges of the central absorber portion 10 are formed as non-perforated concave / convex portions (embossed portions) 12, and an edge portion of the side edge region B near the flap 20. Is formed as a non-opening portion, which is joined to the back sheet 2 at 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 uneven portion 21, and the back sheet 2 is formed in the flap central region E.
And not joined.

The raw materials of the back sheet, the absorbent and the top sheet in 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 sheet that transmits a vapor by adding a filler to a thermoplastic resin is used, and has a feel similar to underwear, for example, a film and a nonwoven fabric. Or a composite material of a film and a woven fabric.

The absorbent 3 is preferably composed mainly of defibrated pulp and used in combination with a high-molecular water-absorbing polymer.
In addition, those obtained by heat-treating a mixture of a thermoplastic resin, a cellulose fiber, and a polymer water-absorbing polymer are preferable. The high-molecular-weight water-absorbing polymer may be a mixture with pulp.The high-molecular-weight water-absorbing polymer has a holding performance of absorbing and holding a liquid 20 times or more its own weight, and has a gelling property. The high molecular water-absorbing polymer is preferably a starch-acrylic acid (salt) graft copolymer, a saponified starch-acrylonitrile copolymer, a crosslinked sodium carboxymethyl cellulose, acrylic acid ( Salts) polymers and the like are preferred.

Examples of the top sheet 1 include hydrophobic thermoplastic resin sheets such as polyolefins, copolymers of olefins with other vinyl monomers such as acrylates and vinyl acetate, polyesters and polyamides.
Among these, a polyolefin or a copolymer of an olefin and another monomer, or a polymer blend-based hydrophobic thermoplastic resin sheet is preferable in terms of feeling and handling.

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

The aperture density of the apertures 13 is limited by the liquid permeation and the ability to prevent liquid return. When the aperture density is small, the liquid permeability is substantially inferior. In consideration of 10 pieces / cm ^{2 to} 100 pieces / cm ²
By weight, and more preferably 30 / cm ² to 60 pieces / cm ^2. Side edge regions B located on both side edges of the central absorber 10
Is a non-perforated uneven portion. The side edge region B extends from the side of the upper surface of the absorber 3 to the side edge surface. More specifically, the width B _L of the upper surface of the absorber 3 in the side edge region B and the absorption B _L It has a dimension _BD 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 absorber portion 10, no opening is formed, and only the uneven portion 12 is formed. Thus, the side edge area B
Since the opening 13 is not formed in the top sheet 1, it is possible to prevent liquid leakage from such a portion and prevent the liquid from flowing out to the flap 20. The shape of the concavo-convex portion 12 formed in the side edge region B can be set to a desired shape by arbitrarily selecting an emboss pattern. The depth of the concave and convex portions 12 is preferably 0.1 to 1.0 mm. 1.0
If it is larger than 0.1 mm, roughness on the skin increases,
If the diameter is smaller than mm, stickiness to the skin increases.

Further, the boundary area C of the top sheet 1
2 are linearly extended from the side edge region B toward the flap 20 in the unfolded state shown in FIG. This boundary area C
In this embodiment, no irregularities are formed in this embodiment, but extremely small irregularities may be formed. As described above, by forming the boundary region C flat, it is possible to easily bend at such a portion, and it is possible to increase the fit to the wearer.

In the present embodiment, the width of the boundary region C is formed to be substantially equal to the thickness of the crotch portion of the shorts. As described above, the boundary area C is formed between the side edge area B and the flap area 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 area C is preferably 5 to 20 mm, particularly preferably 8 to 15 mm. In the boundary area C, the top sheet 1 is adhered to the back sheet 2 by the seal portion 14. Known means is used for the seal portion 14, for example, hot melt, heat seal, ultrasonic fusion, or the like is used.

As described above, the adhesion between the top sheet 1 and the back sheet 2 in the boundary region C can prevent the excreted liquid from moving from the side edge of the absorber 3 to the flap 20. The entire peripheral 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 entire peripheral area A has a width of 3 to 15 mm, and is preferably formed substantially uniformly.

[0027] Since a part of the entire peripheral area A located before and after the absorber 3 and the seal portion 14 located on the side of the absorber 3 are respectively surrounded and held, the absorption during wearing is possible. “Yaw” and “displacement” of the body 3 are prevented.
On the other hand, the flaps 20 extending outward from the center of both sides of the central absorber portion 10 are formed 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. And the flap central region E is not joined. This flap central area E
In the example, the uneven portion 21 is formed on the top sheet 1,
Provides cushioning and good feel. Further, 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 shape, size, and depth of the concave and convex portions in the side edge region B and the central region E are not necessarily required to be the same.
With the configuration described above, the flap 20 has a voluminous and flexible configuration. Further, the flap 20 has no opening formed in the top sheet 1,
In addition, since the space between the absorber 3 and the absorber 3 is partitioned by the above-described seal portion 14, stress in the width direction during wearing can be reduced, and damage to the central absorber 10 can be prevented.

[0029]

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 formed as the non-opening uneven portion 12, the liquid leakage from the side edge region B is prevented, and the bodily fluid that has returned to the opening 13 of the top sheet is formed by the unevenness of the side edge region B. Liquid flow over portion 12 to flap 20 is prevented.

Since both side edges of the boundary region C form the boundary between the uneven portion 12 and the non-uneven portion, the flap 20 can be easily bent at the two boundary lines, especially the flap side boundary line. The sanitary napkin with its boundary area C
Can be accurately and easily attached to the crotch portion of the shorts according to the thickness of the shorts. The unevenness 12 is provided on the top sheet in the side edge region B and the flap center region E that abut on the wearer's leg, and the surface of the top sheet 1 in this region is made flexible, so that a good wearing feeling can be obtained.

Since the top sheet 1 and the back sheet 2 are joined (sealed) in the boundary area C, the movement of bodily fluid from the side edge of the absorber 3 to the space between the sheets of the flap 20 is prevented, and the absorption of the absorber is prevented. Movement is prevented. Since the absorber 3 is surrounded and held by a part of the entire surrounding area A located before and after the absorber 3 and the seal portion 14 located on the side of the absorber 3, it is possible to “strain” the absorber 3 during wearing. "Displacement" is prevented.

The flap 20 is formed of two layers, a top sheet 1 and a back sheet 2. The top sheet 1 in the flap center region E has an uneven portion 21 and only the periphery of the flap 20 is joined. Therefore, it has a voluminous feel and is rich in softness, and can give a good wearing feeling. Since the top sheet 1 of the flap 20 is non-open, and has a seal portion between the top sheet 1 and the absorber 3, the stress in the width direction during and during wearing is reduced, and the flap is not broken.

[Brief description of the drawings]

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

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

FIG. 3 is a sectional view showing a state in which the sanitary napkin shown in FIG. 1 is mounted on shorts.

[Description of Signs] 1 Top sheet 2 Back sheet 3 Absorber 4 Adhesive layer 10 Central absorber section 12 Non-perforated unevenness 13 Opening A All peripheral area B Side peripheral area C Boundary area E Flap central area

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A61F 13/15-13/84

Claims (3)

(57) [Claims] A central absorbent portion formed of a liquid-impermeable backsheet, an absorbent mainly composed of pulp fibers and a superabsorbent polymer, and a liquid-permeable topsheet formed of a perforated plastic film; A pair of flaps each extending outward from the center of both sides of the central absorbent portion, wherein the pair of flaps are substantially coplanar with the backsheet and the topsheet forming the central absorbent portion. An adhesive layer and a release sheet covering the surface thereof are formed by laminating extended portions extended so as to form a shape, joining the entire peripheral regions thereof, and forming an adhesive layer on the outer surface of the back sheet. In the sanitary napkin in which the top sheet is disposed, side edge regions located on both side edges of the central absorbent portion are formed as non-opening uneven portions, and the side edge region is provided. A boundary region from the edge of the region near the flap to the flap is formed as a non-opening portion, is joined to the back sheet at 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 located at the position (1) is formed as a non-opening uneven 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 a side of an upper surface of the absorber to a 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.