JPH03236838A - Sanitary napkin - Google Patents

Abstract

PURPOSE:To surely prevent sideways leakage of menstruation blood by forming flap portions on the side portions of a napkin, forming free barrier cuffs inside the flap portions in the cross direction, and fixing elastic expansible members to the inside edges of the barrier cuffs. CONSTITUTION:An absorption element is formed by an absorber 4, an absorbing sheet 5, a cushion material layer 6 and a bellows base sheet 7, and with the absorption element covered with the second leakage preventing sheet 3 and a surface sheet 1, its lower surface, both side surfaces and a part of its upper surface are covered with the first leakage preventing sheet 2. Flap portions F are formed by the first and second leakage preventing sheets 2, 3 and the surface sheet 1, and the outside portions thereof are welded by heat to become integrated flap portions. Portions of the flaps which are not fixed to the surface sheet 1 become free barrier cuffs B, and elastic expansible members 9 are disposed on the inside edge S of the barrier cuffs B, The menstruation blood passes through the surface sheet 1 to be absorbed in the absorption element. Though mestruation blood flows sideways along the surface sheet 1 when its quantity is large the mestruation blood can be checked from flowing by the barrier cuffs B so as to prevent sideways leakage.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a sanitary napkin with barrier cuffs.

[Conventional technology]

In recent years, there have been significant improvements in the structure of sanitary napkins, and in Japanese Patent Publication No. 59-10222, the side edges of a leak-proof sheet rolled up through the side of the absorbent body are overlapped on both sides of the top sheet. It is known that the napkin is bonded intermittently or continuously in the longitudinal direction of the napkin (hereinafter referred to as Prior Example 1). Furthermore, Japanese Utility Model Publication No. 60-31718 also discloses a structure in which an absorbent body and a leak-proof sheet are entirely covered with a liquid-permeable sheet (hereinafter referred to as precedent example 2).

A common technical feature of these prior arts is that recesses are formed on the sides of the absorbent body to improve adhesion to private parts, although this is not explicitly stated in each publication.

[Problem to be solved by the invention]

However, in Prior Example 1, by forming the edge portion,
It is noteworthy that it can prevent menstrual blood from leaking in the horizontal direction, but as mentioned in the publication related to Prior Example 2, the problem is that the edge part bends inward or outward. The fundamental drawback is that it is easy to use, and proper positioning is difficult.

On the other hand, in prior example 2, the leak-proof layers on the front and back surfaces are fixed to each other at the edge part to form a planar fixed part, but because of this, the side leakage of menstrual blood is worse than in prior example 1. result in a worse result.

Therefore, an object of the present invention is to reliably prevent side leakage of menstrual blood and to stably prevent side leakage even when the wearer moves.

[Means to solve the problem]

The above problem includes an absorbent element and an enveloping material that wraps the absorbent element and includes a liquid-permeable sheet and a leak-proof sheet, and by forming a recess in a part of the side edge of the absorbent element, A flap part is formed between the material and the side edge of the wrapping material without forming a recessed part, or a flap part is formed by separating the side edge of the wrapping material,
A free barrier cuff that is not fixed to the covering material is formed inside the flap in the width direction, and an elastic elastic member is fixed along the inner edge of the barrier cuff so that it can be contracted when worn. This can be solved by arranging that at least the surface of the base of the barrier cuff of the flap portion is fixed to the back surface, and the barrier cuff is configured to stand up due to this fixation.

It also includes an absorbent element and a covering material that wraps the absorbent element and includes a liquid-permeable sheet and a leak-proof sheet, and a recess is formed in a part of the side edge of the absorbent element so that the side edge of the covering material is connected to the absorbent element. a flap part is formed in between, and a free barrier cuff that is not fixed to the wrapping material is formed inwardly in the width direction of the flap part of the brace,
An elastic elastic member is fixed along the longitudinal direction to the inner edge of the barrier cuff so that it can be contracted when worn, and at least the surface of the base of the barrier cuff in the flap portion is fixed to the back surface, and this fixation causes the barrier cuff to The cuff is configured to stand up, and further, a portion of the barrier cuff other than the position where the recess is formed extends over the wrapping material on the side of the absorbent element;
This problem can also be solved by forming a pocket space that is not fixed to the upper back surface of the wrapping material on the side of the absorbent element and opens toward the center of the napkin.

[Effect]

In the present invention, a flap part F is formed on the side of the napkin,
A free barrier cuff B that is not fixed to the wrapping material is formed inside the flap part F in the width direction, and an elastic elastic member 9 is formed along the inner edge of the barrier cuff B so that it can be contracted when worn. At least the surface of the base of the barrier cuff B of the flap part F is fixed to the back surface, so that the barrier cuff B stands up due to this fixation.

On the other hand, when the elastic stretchable member 9 is attached to the barrier cuff B, the napkin is deformed into a boat shape in the longitudinal direction due to the contraction of the elastic stretchable member 9, as shown in FIG. 4, thereby improving the fit to the wearer.

In addition, if the surface of the base of the barrier cuff B of the flap part F is not fixed to the back surface, the barrier cuff B is in a state in which it lies down inside the napkin (as shown in Fig. 3). However, since at least the surface of the base of the barrier cuff in the flap portion is fixed to the back surface, the barrier cuff can be reliably erected as shown in FIG. 2.

Moreover, the barrier cuff B always straightens due to the contraction of the elastic elastic member 9, so that it always maintains its erect state at a normal position regardless of the movement of the wearer.

[Specific structure of the invention]

The present invention will be explained in more detail below with reference to some examples.

(First Example) Figures 1 to 4 show an example of the structure of a sanitary napkin as an absorbent article, where l is a liquid-permeable surface sheet, and 2 is made of a nonwoven fabric treated with water repellent treatment such as silicone. 3 is a second leak-proof sheet made of polylaminated waterproof paper, and constitutes a covering material for the absorbent body 4.

The absorbent body 4 is made of cotton-like pulp or the like, and a part of its long side is cut out to form a recess 4a. This absorbent body 4 is covered with water-absorbing paper 5, but when forming the recessed portion 4a, it is torn in one piece, so that the side surface of the absorbent body 4 is open at the portion where the recessed portion 4a is formed.

Reference numeral 6 denotes a corrugated (concert-shaped) cushioning material layer, which will be explained in detail later, which is fixed to the bellows mount 7 below, and is fixed to the upper surface of the absorbent paper 5 that wraps the absorbent body 4 with a hot melt adhesive 8. . Thus, in this embodiment, the absorbent element is composed of the absorbent body 4, the absorbent paper 5, the cushion material layer 6, and the bellows mount 7.

The lower surface, both side surfaces, and a portion of the upper surface of this absorbent element have a lip groove shape and are covered with a second leakage prevention sheet 3, and the upper surface of the absorbent element is covered with a top sheet 1.

Furthermore, the lower surface, both side surfaces, and a part of the upper surface of the absorbent element covered with the second leak-proof sheet 3 and the top sheet 1 are covered with the first leak-proof sheet 2.

Moreover, both sides of the first leak-proof sheet 2 are folded back inward to form a double portion, and the side edges of this double portion extend to the lower surface. Further, an elastic elastic member 9 made of rubber thread or the like is provided at the side edge of this double portion. Further, as shown by reference numeral 1O in FIG. 1, a hot melt adhesive is applied to the upper surface of the double portion of the absorbent element except for an unapplied portion slightly wider than the side edge.

On the other hand, in the recess 4a where no absorbing element exists, a flap part F is formed by the first leak-proof sheet 2, the second leak-proof sheet 3, and the top sheet 1, and the outer part of this flap part F is It is thermally welded with a heat embossing roll or plate to form an integrated flap part. This portion that is not an integrated flap portion and is not fixed to the topsheet 1 serves as a free barrier cuff B. An elastic elastic member 9 is disposed on the inner edge of the barrier cuff B.

On the other hand, both longitudinal ends of the napkin are heat-sealed S as is known. 11 is after peeling off the release paper 12.
This is a hot melt adhesive that is attached to shorts to prevent them from slipping. 13 is a hot melt adhesive for fixing the cushioning material layer 6 of the top sheet 1. Furthermore, embossments E are formed on the surface of the napkin to promote longitudinal diffusion of menstrual blood.

On the other hand, when manufacturing napkins, the elastic stretchable member 9 is continuously supplied, and is fixed only in the area shown in FIG. When the above-mentioned heat sealing S is applied after the napkin element is bonded to other napkin elements, the unattached portion of the elastic elastic member 9 contracts.

Thereby, the contractile force can be applied only to the fixed portion of the elastic elastic member 9. Such a manufacturing method is extremely effective.

In the napkin constructed as described above, menstrual blood passes through the top sheet 1 and is absorbed into the absorbent element. However, if there is a large amount of menstrual blood, it may flow laterally through the top sheet 1, but the menstrual blood that flows laterally is blocked by the barrier cuffs B, thereby preventing lateral leakage.

In addition, since there is a free part between the double side edge of the first leak-proof sheet 2 and the edge where the hot melt adhesive 10 is applied, in a flat state, as shown in FIG. 3, there is a free part. Although the napkin is lying on the inside, when it is worn, the entire napkin deforms into a boat shape as shown in FIG. As the free part is dragged, the free part becomes slightly erect, and a pocket space P is formed between the erected free part and the top sheet 1, which has the effect of preventing side leakage, especially when sleeping on the back. brought about.

On the other hand, the top sheet 1 is made of a perforated or non-perforated nonwoven fabric or a perforated plastic film. The use of a perforated plastic film as a top sheet has recently been adopted in some sanitary napkins. The perforated surface sheet 1 is preferably made of plastic film or nonwoven fabric from the viewpoint of tactility. If a plastic film is used, it may be funnel-shaped or may simply be a right-angled hole.

No matter what material it is made of, the thickness of the top sheet must be IB or less.
In particular, 0.1+u++ or less, the pore diameter is 1W or less, the porosity is 15-45%, especially 27-32%, the wetting angle (angle formed by water droplets) α is 90' or less, and the pore angle θ based on the outer surface is 90°
The above is preferable.

The holes may be formed by any appropriate method, such as puncturing with a needle or perforation using high-pressure fluid, such as high-pressure water.

By the way, it is known from JP-A-62-12500I to provide a cushioning material layer below a perforated hydrophobic fiber sheet. However, the cushioning material layer here is simply a single layer of hydrophobic fibers and is flush. This has disadvantages such as lack of cushioning properties and high cost as described below, so it is preferable to have a corrugated cross section and a laminated structure of multiple layers.

Therefore, in the embodiment, the cushion material layer 6 is
It has a two-layer laminated structure of an upper layer 6A and a lower layer 6B. The reason for this two-layer structure is to increase the bulkiness of the cushioning material layer 6 and to provide voids between the layers to improve the cushioning properties and increase the absorption rate.
- It does not prevent it from being a layer or three or more layers.

The cushioning material in this example is a hydrophobic fiber, such as ES fiber (polypropylene fiber coated with polyethylene) and ET fiber (polyester fiber coated with polyethylene) which has heat-melting property. The main component (preferably 80% or more) of synthetic fibers is used. The thickness of the fibers constituting the cushioning material is preferably 3 to 14 deniers. The synthetic fiber is not particularly limited as long as it is a hydrophobic fiber, and may be one that makes the cushioning material insensitive to moisture. If it is necessary to reduce the moisture insensitivity of the cushion layer, a method of spraying a surfactant or immersing it in a surfactant solution can be used, or a small amount of rayon fiber or the like may be included.

As a manufacturing method for the cushion material, a method can be used in which a portion of heat-melting fibers such as ES fibers and ET fibers is melted using a hot air flow and the fibers are bonded to each other. However, a fiber bonding method using an adhesive may also be used.

The basis weight of the cushion material is 8g/rIi~30g/
rd, the basis weight when this is laminated and made into a corrugated shape is:
A sheet of 20 g/yi to 90 g/rd is preferred. Different types of materials having different densities and deniers may be stacked. In addition to the above reasons, the reason why a multi-layer cushion material is preferable is that
When supplying absorbent products such as sanitary napkins in rolls during the manufacturing process, the number of times the rolls need to be changed is reduced compared to using rolls of single-layer thick cushioning material. This is because there are also advantages. The density of the cushion material itself is less than 0.1 g/rd, especially 0.1 g/rd.
0.005 to 0.05 g/rd is preferred. The bulk is preferably from 0.5 to 10 mm, particularly from i, o to 7.0 IIDI.

As for the appearance finish of the cushioning material layer, a flat sheet will have poor cushioning effect, so it is particularly preferable to have a corrugated shape (concerce-like shape) as shown in the above example because it improves cushioning properties and absorption speed. .

The cushioning material layer 6 may be located at least in the longitudinal center of the napkin, and may extend over the entire length. The number of waves is preferably 3-10. Both sides of the cushioning material layer 6 may be corrugated.

In the above example, the absorbent element according to the present invention was basically composed of the absorbent body 4, the absorbent paper 5, and the cushion material layer 6, but the absorbent element refers to the part that ultimately retains menstrual blood. The configuration is not limited. Although the bellows mount 7 is not essential, its presence increases the shape retention of the cushion material layer 6.

(Second Embodiment) FIG. 5 shows a second embodiment, and is a cross-sectional view at the position where the recess 4a is formed. In this example, the second leak-proof sheet 3 is rolled into the double layer of the first leak-proof sheet 2. Further, since the side portion of the second leak-proof sheet 3 extends close to the edge of the barrier cuff B, the material of the first leak-proof sheet 2 may be a simple non-woven fabric that has not been subjected to water-repellent treatment.

(Third Example) On each side, the wrapping material itself that covers the absorbent element,
Barrier cuffs B were formed, but as shown in FIG.
Barrier cuffs B can also be formed by joining to the first leak-proof sheet 2.

(Fourth Embodiment) In the first embodiment, in order to make the barrier cuff B stand up, the front surface is fixed to the back surface from the base to the side edge of the napkin, but as shown in FIG. ,
Only the base portion of the barrier cuff B may be used.

(Fifth Embodiment) On the other hand, as shown in FIG. 8, the barrier cuff forming material other than the position of the concave portion 4a is folded back, for example, by folding the first leak-proof sheet 2 outward, and the folded portions are bonded together with hot melt adhesive or the like. Can be fixed. In this case, the front and rear ends of the napkin can be heat-sealed S in the folded state.

Further, as long as heat sealing S is performed, it is not essential that the folded portions of the first leakproof sheet 2 are fixed to each other.

(Modification) On the other hand, in the above example, a part of the absorbent body 4 is cut out to form the recess 4a, and the flap part F is formed only in the recess 4a. By making the width of the absorbent body 4 shorter overall than the width in the direction, a flap portion may be formed over the entire long side.

Furthermore, in this case, as a standing barrier cuff B, the front surface can be fixed entirely or partially in the longitudinal direction to the back surface.

〔Effect of the invention〕

As described above, according to the present invention, the standing barrier cuffs having the elastic stretchable member can reliably prevent menstrual blood from leaking sideways, and the barrier cuffs always remain in the normal position even when the wearer moves. Therefore, side leakage can be stably prevented.

[Brief explanation of drawings]

Figure 1 is a partially cutaway plan view of an example of the structure of a sanitary napkin;
and Figure 3 are views from the ■-■ line and the ■-■ line, respectively.
FIG. 4 is a perspective view thereof, and FIGS. 5 to 8 are cross-sectional views of other embodiments. l... Surface sheet, 2... First leak-proof sheet, 3...
-Second leak-proof sheet, 4...Absorber, 6...Cushion material layer, 9...Elastic stretch member, B...Barrier cuff, F...Flap part, S...Heat seal . Figure 1 Figure 2 Figure Figure Figure Figure Figure Figure

Claims (2)

[Claims] (1) It includes an absorbent element and a covering material that wraps the absorbent element and is made of a liquid-permeable sheet and a leak-proof sheet, and by forming a recess in a part of the side edge of the absorbent element, the side edge of the wrapping material A flap part is formed in between, or a flap part is formed by separating the side edge of the wrapping material without forming a concave part, and the flap part is fixed to the wrapping material inwardly in the width direction of this flap part. A free barrier cuff is formed, and an elastic elastic member is fixed along the inner edge of the barrier cuff in the longitudinal direction so that it can be contracted when worn, so that at least the surface of the base of the barrier cuff of the flap portion is against the back surface. A sanitary napkin, characterized in that the barrier cuffs are fixed to each other, and the barrier cuffs are configured to stand up due to this fixation. (2) It includes an absorbent element and an enveloping material that wraps the absorbent element and includes a liquid-permeable sheet and a leak-proof sheet, and a recess is formed in a part of the side edge of the absorbent element so that the side edge of the enveloping material a flap part is formed between the cuffs, and a free barrier cuff that is not fixed to the wrapping material is formed inwardly in the width direction of the flap part;
An elastic elastic member is fixed to the inner edge of the barrier cuff along the longitudinal direction so that it can be contracted when worn, and at least the surface of the base of the barrier cuff in the flap portion is fixed to the back surface, and this fixation causes the barrier cuff to The cuff is configured to stand up, and further, a portion of the barrier cuff other than the position where the recess is formed extends over the wrapping material on the side of the absorbent element;
A sanitary napkin characterized in that the pocket space is not fixed to the upper and back surfaces of the wrapping material on the sides of the absorbent element and opens at the center of the napkin.