JPH0431274B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to absorbent articles such as paper diapers and sanitary napkins that have an elastic stretchable member.

[Conventional technology]

In recent years, attention has been focused on the importance of preventing leakage from the waist area of this type of diaper, and several solutions have been proposed. One typical example of this is as described in Japanese Patent Application Laid-Open No. 61-83368, in which a heat-shrinkable elastic band is provided around the waist of the diaper in place of the usual rubber band.
Hot air is used for shrinking.

The other one is as in Utility Model Application Publication No. 60-306,
The top sheet and back sheet are glued together around the waist using a hydrophobic adhesive.

Furthermore, as disclosed in Japanese Patent Application Laid-open No. 17101/1983, there is also known a device in which the entire elastic stretchable member is fixed to the sheet of a disposable diaper via an adhesive.

[Problem that the invention seeks to solve]

However, in the first structure described above, urine often oozes out to the longitudinal ends of the diaper through the water-permeable top sheet, and sometimes leaks from the valleys of small undulations accompanying the expansion and contraction of the elastic band.

In the second structure, since there is no elastic band, as the wearer moves, a gap is created between the wearer's skin and the surface of the diaper, causing urine to leak.

As described above, with each conventional technique, it has not been possible to prevent leakage from the waist of a disposable diaper, so-called front and rear leakage.

On the other hand, when an elastic elastic member is provided around the waist or around the legs, such as in Japanese Patent Laid-Open No. 60-17101, the elastic member is fixed to the top sheet and/or the back sheet using an adhesive along its entire length.

However, if the elastic elastic member is fixed to the sheet along its entire length, the elastic elastic member expands and contracts along with the sheet, and when it contracts, it creates numerous small, sharp wrinkles, especially on the top sheet, and these wrinkles come into contact with the wearer's skin. , which was a cause of worsening the texture of the skin. Furthermore, if hot melt adhesive is applied over the entire length of the elastic elastic member, the amount of hot melt adhesive used will increase, resulting in a cost disadvantage, and furthermore, discoloration due to aging will appear over the entire length, impairing the appearance.

On the other hand, it is necessary to take measures against side leakage not only around the waist but also around the legs.

This case is also attempted to be solved by providing elastic stretchable members around the legs along the longitudinal direction. Furthermore, as shown in Japanese Utility Model Application Publication No. 58-30421, it is also known to provide a sheet for preventing leakage in the front and rear ends, straddling the edges of the absorbent body, not around the legs.

However, when applying the latter publication description to the leg area and providing an elastic elastic member for the leg area, if the elastic elastic member is provided outward from the outer side edge of the leak prevention sheet, the side of the absorbent body Since it is far away from the edge, the pressing force of the elastic elastic member does not act as a pressing force of the absorbent body against the skin, and the private part and the liquid-permeable top sheet or absorbent body are separated by a large distance, which tends to cause lateral leakage.

On the other hand, if the elastic elastic member were to overlap the leak prevention sheet, the contractile force of the elastic elastic member would be absorbed to some extent by the rigid leak prevention sheet, reducing its adhesion to the skin and causing lateral damage. Not only is leakage likely to occur, but the rigidity of the leakage prevention sheet can be felt against the skin, resulting in poor tactility.

Therefore, an object of the present invention is to reliably prevent side leakage and to provide a good feel to the skin.

[Means to solve the problem]

The above problem is solved by an absorbent article having a flap portion in which a body fluid absorbent body is interposed between a liquid-permeable top sheet and a liquid-impermeable back sheet, and in which no absorbent body extends outward from the end of the absorbent body. On both sides of the article, the material is applied between the liquid-permeable top sheet and the liquid-impermeable back sheet in the flap portion, and extends continuously from the flap portion beyond the side edge of the absorbent body, leaving a portion that absorbs body fluids. A thin film of hot melt adhesive is applied between the upper peripheral surface of the absorbent body and the liquid-permeable top sheet, and a thin film of hot-melt adhesive is applied between the liquid-permeable top sheet and the non-liquid-permeable back sheet in the flap portion and in the thin film area around the legs. An elastic stretchable member is provided along the longitudinal direction, and the thin film is not applied to a portion of the elastic stretchable member except for both ends thereof, and is not fixed to a liquid-permeable top sheet and a liquid-impermeable back sheet. This problem can be solved by having both ends of the elastic elastic member fixed to at least one of the liquid-permeable top sheet and the liquid-impermeable back sheet.

[Effect]

In the present invention, since the elastic elastic member is fixed to the top sheet and/or back sheet only at both ends thereof, the middle part is free, and the top sheet only has large folds due to contraction of the elastic elastic member, and small wrinkles do not occur. However, the tactility is improved.

Furthermore, the amount of adhesive used for fixing the elastic elastic member to the sheet can be reduced, thereby reducing costs, and the appearance deteriorates less due to aging of the adhesive.

Furthermore, in the present invention, the material is applied between the liquid-permeable top sheet and the liquid-impermeable back sheet at the flap portions on both sides of the article, and continuously extends from the flap portions beyond the side edges of the absorbent body to absorb body fluids. A thin film of hot-melt adhesive is applied between the upper peripheral surface of the absorbent body and the liquid-permeable top sheet, leaving the upper peripheral part of the absorbent body. It is possible to prevent lateral leakage from seeping out from the surface.

Moreover, the elastic stretchable member can be placed in the thin film application area, thereby allowing it to be placed close to the side edge of the absorbent body, thereby exerting a contractile force also on the side edge of the absorbent body. I can do it. As a result, it is possible to suppress the separation between the private parts and the upper surface of the disposable diaper,
It is possible to prevent urine from moving laterally along the surface of the paper diaper and leaking.

On the other hand, since a thin film made of hot melt adhesive is used instead of a sheet as the side leak prevention membrane,
It has excellent tactility, and since there is no thin film in the region of the elastic elastic member, the elastic elastic member presses only the liquid-permeable top sheet against the skin, resulting in excellent tactility.

〔Example〕

The present invention will be explained in further detail below using examples in which the absorbent article shown in the drawings is a paper diaper.

FIGS. 1 and 2 show a first embodiment, and this disposable diaper includes a liquid-permeable top sheet 1 made of non-woven fabric or the like with a weight of about 20 to 50 g/m ² and a liquid-impermeable back sheet 2 made of polyethylene film or the like. A body fluid absorber 3 made of cotton-like pulp or the like is interposed between the sheets 1 and 2. Both are short, thereby forming flap portions of the sheets 1 and 2 in which no absorbent body 3 is present at both ends in the longitudinal direction and both ends in the width direction.

Further, elastic elastic members 4, 4 around the legs are provided adjacent to both sides of the absorbent body 3 in the width direction, and the other absorbent body 3
Adjacent to both ends in the longitudinal direction, elastic stretchable members 5, 6 are provided for the waist circumference, including a long back side and a short ventral side. 7 is a binding tape.

On the other hand, as can be seen in Fig. 2, between the top sheet 1 and the back sheet 2, there is a layer of 10 to 100 sheets for fixing them together and preventing body fluids from seeping out.
A hot-melt thin film 8 of approximately g/m ² is provided, and this thin film 8 extends from the position of the elastic elastic members 4, 4 to the outer side in the entire longitudinal direction and width direction of the disposable diaper, and in the central part. A window 8a is formed through the top sheet 1 to absorb body fluids into the absorbent body 3, and therefore the upper surface of the peripheral edge of the absorbent body 3 near the top sheet 1 is covered with a hot melt thin film.

Furthermore, the hot melt thin film 8 is not provided at the location where the elastic elastic member 5 is provided. The elastic stretchable member 5 is fixed to the back sheet 2, for example, by a hot melt adhesive 9 only at both ends in the width direction of the paper diaper, and the middle part is completely free and unrestrained by the hot melt thin film 8.

The other elastic elastic member 6 has, in its entirety,
It is fixed to the top sheet 1 by the hot melt thin film 8 and, if necessary, to the back sheet 2 by hot melt adhesive (not shown), so that it is completely restrained.

Regarding the elastic stretchable member 4 around the legs, a small window in which the hot melt thin film 8 is not present is formed only in the middle part in the longitudinal direction, and both ends of the elastic stretchable member 4 in the longitudinal direction are coated with hot melt on the back sheet 2 next to the back sheet 2. It is fixed with adhesive 10. Also, of course, the surfaces of the top sheet 1 at both ends of the elastic elastic member 4 are fixed to the top sheet 1 by the presence of the hot melt thin film 8.

Referring also to FIG. 8, the binding tape 7 is placed at a position where it partially wraps around the elastic elastic member 5. This is done by devising the point of application of force so that when the binding tape 7 is pulled during installation, the elastic stretchable member 5 is stretched appropriately.

FIG. 3 shows a hot melt thin film 8 attached to an elastic elastic member 5.
This is an example in which the top is also coated, but only that part is not melted using a cooling roll or the like, and therefore is not bonded. 4 and 5 are similarly shown,
This is an example in which two elastic elastic members 5A and 5B are provided.

Of course, there may be three or more. In the example shown in FIG. 4, the hot melt thin film 8 is fixed to the backsheet 2 between the members 5A and 5B, but in FIG. 5, it is not fixed. 6 and 7 show examples in which the hot melt thin film 8 is formed in a linear shape.

By the way, as the elastic stretchable member in the present invention, in addition to urethane rubber, natural rubber, and synthetic rubber,
A heat-shrinkable material such as "Spandex" of approximately 840D or "KER2207" manufactured by 3M Company may be used, and a colored material may also be used. Its expansion/contraction ratio is preferably 110 to 250%, particularly preferably 150 to 200%, and its elastic strength is preferably 50 to 400 g, particularly preferably 100 to 200 g.

Examples of the hot melt thin film include "H6285" and "HB Fuller" manufactured by Nitta Gelatin Co., Ltd., and "Nicomelt ACH-1" manufactured by Malcolm Cocol.

Instead of the hot melt thin film, a plastic film may be provided in the same manner as in the above example.

〔Effect of the invention〕

As described above, according to the present invention, in preventing leakage due to the presence of the elastic stretchable member, it is possible to reduce discomfort to the skin of the wearer in that area.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway plan view of the disposable diaper of the present invention, Fig. 2 is a sectional view taken along the - line, Figs. 3 to 7 are sectional views of other embodiments, and Fig. 8 is a portion of the binding tape. FIG. 1...Top sheet, 2...Back sheet, 3
... Absorbent body, 4 ... Elastic stretchable member for around the legs, 5,
6... Elastic elastic member for waist circumference, 8... Hot melt thin film, 9, 10... Hot melt adhesive.

Claims (1)

[Scope of Claims] 1. An absorbent article having a body fluid absorbent interposed between a liquid-permeable top sheet and a liquid-impermeable backsheet, and a flap portion extending outward from the edge of the absorbent body and having no absorbent body. , which is applied on both sides of the article between the liquid-permeable top sheet and the liquid-impermeable back sheet in the flap portion, and continuously extends from the flap portion beyond the side edge of the absorbent body to absorb body fluids. A thin film of hot-melt adhesive is applied between the upper peripheral surface of the absorber and the liquid-permeable top sheet, leaving a portion remaining, and a thin film of hot-melt adhesive is applied between the liquid-permeable top sheet and the non-liquid-permeable back sheet in the flap portion and in the thin film area. An elastic elastic member around the legs is provided along the longitudinal direction, the thin film is not applied to any part of the elastic elastic member other than both ends, and the elastic member is fixed to a liquid-permeable top sheet and a non-liquid-permeable back sheet. An absorbent article characterized in that the elastic stretchable member is free, and both ends of the elastic elastic member are fixed to at least one of a liquid-permeable top sheet and a liquid-impermeable back sheet.