JP2587166Y2 - Elastic composite - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method of combining a sheet-like elastic body with a sheet-like substrate made of a non-woven fabric or a liquid-impermeable material, which is particularly suitable for disposable products such as diapers. The present invention relates to a permeable elastic composite.

[0002]

2. Description of the Related Art Daily wear such as underwear and socks, disposable diapers waist, crotch, elastic bandages, surgical gown cuffs, etc. are used to enhance the adhesion to the human body. Elastic body is used. These are materials such as natural rubber, synthetic rubber, and urethane resin, which are in the form of thread, foam, film, or net, and are covered with woven fabric, nonwoven fabric, or thread to avoid direct contact with the human body. It is generally used in.

[0003]

[Problems to be Solved by the Invention] In order for the elastic body to be used for a disposable product such as a diaper, the price is low, the workability for application to mass high-speed production is excellent, and the sensitive skin of infants is also required. Strict safety is required. Moreover, it would be advantageous to have a leakproof property. The present invention
It is an object of the present invention to provide an elastic composite having both safety to human skin and leakproofness.

[0004]

SUMMARY OF THE INVENTION The present invention comprises a sheet-like elastic body in a relaxed state and sheet-like substrates on both sides thereof, and both are continuously bonded in the sheet length direction (MD). The substrate is bonded with discontinuity in the transverse direction (CD), and the base material and the elastic body are connected between the joints with the elastic body.
Has formed a channel-like fold that has no substantial connection, so that it can follow when the elastic body is tensioned,
The elastic composite is characterized in that at least the substrate on one side of the elastic body is formed of a liquid impermeable material.

More specifically, as shown in the drawings, as shown in FIG. 1, a sheet-like substrate 2 made of a liquid-impermeable material and a sheet-like substrate 3 are joined at a joining portion A composed of a number of lines parallel to the MD direction, and folds are formed on each of the base materials 2 and 3 between the joining portions A. Therefore, when this is cut into a certain size and extended in the CD direction, each fold can follow the tension of the elastic body, and the tension can be increased accordingly. The folds are CD
In addition to increasing the degree of freedom of the elastic body in the direction, it has a cushioning effect on the skin and gently contacts it, and secures breathability for comfortable tightening. The interval between the coupling portions A does not necessarily have to be constant, and the interval may be changed in a wide and narrow manner at a constant period. Further, the upper and lower coupling portions A may be shifted from each other instead of being at the same position. Further, a zone in which no folds are provided at a fixed width at both ends may be formed, or a zone having only a liquid impermeable material or a nonwoven fabric may be provided.

The components of the present invention are the sheet-like elastic body and the sheet-like base material as described above, and the connection state of both. First, as the sheet-like elastic body, natural rubber, a thin sheet of synthetic rubber or the like, a polyurethane film, a polyurethane melt blown nonwoven fabric, a styrene-butadiene block polymer film, a material such as a polyolefin-based elastomer film can be used, Considering cost, thermocompression bonding with the substrate, etc., EVA and ultra-low density L
Polyolefin elastomers such as LDPE, ethylene propylene elastomer and ethylene methyl acrylate elastomer alone or synthetic rubbers thereof, styrene ethylene butadiene styrene block polymer (SEB
A blend of S) or a coextruded film of a polyurethane elastomer and a polyolefin elastomer is desirable.

As the substrate 2 which is desirable as the liquid-impermeable material, polyolefin films such as polyethylene, polypropylene and vinyl acetate copolymer, nylon, polyester and the like are used. desirable. These substrates 2 exhibit leakproofness when the present invention is applied to various products.

On the surface of the elastic body 1 opposite to the base material 2, a base material made of a nonwoven fabric mainly composed of synthetic fibers having thermocompression bonding properties is formed, and this nonwoven fabric has extensibility in the CD direction. Should not have elongation recovery. The raw material fibers of the non-woven fabric are preferably PE, P, which are hydrophobic fibers that are less irritating to the skin with less water wetness and have less safety.
It is desirable that the staples are formed from 1.5d to 3d synthetic fiber staples such as P and PET.

There are various methods for joining the elastic body and the base material. First, in the case where the base material is a material having both extensibility in the CD direction but no elongation recovery property, as shown in FIG. Then, the base material 3 made of a nonwoven fabric is overlapped on the other surface, and heat-sealed at a joint A composed of a plurality of parallel lines continuous in the MD direction, and a non-joint B is formed between the joints A.

When this is pulled within the elastic range of the elastic body in the CD direction as shown in FIG. 3A and without damaging the bases 2 and 3, the respective parts 1 as shown in FIG. , 2, and 3 extend equally. When the tensile force is released as shown in (c), the elastic body 1 returns to the original size, but the base materials 2 and 3 have no elongation recovery property.
3 is apart from the elastic body 1 and forms a fold between the joints A.

FIG. 4 shows a case where the base material 2 has little extensibility in the CD direction and the base material 3 has extensibility in the CD direction. First, as shown in FIG. And superimpose
This is pulled in the CD direction, and then overlaid on the substrate 2 as shown in FIG.
When the tensile force is released as shown in (c), the heat seal first returns the elastic body 1 to its original size,
Form folds.

When a material that cannot be heat-sealed is used, the joint A may be joined with an adhesive.

[0013]

EXAMPLE As an elastic body 1 shown in FIG. 1, an elastic film made of a polyolefin elastomer (a copolymer of EVA and synthetic rubber) PFB-75 manufactured by Nippon Yunika was used. As the substrate 3, a nonwoven fabric formed by hydroentanglement of 1.5d × 45 m / m PP was used. The base material 2 is L.L. L. D. P. E. FIG. (Liner Low Den
An elastic composite was formed using a film made by a 15 μm inflation method (situation PE). This was cut to a predetermined width in the CD direction and applied to a diaper as shown in FIG. That is, the elastic composite E of the present invention is adhered to the waist portions W before and after the diaper, and the base material 3 made of a nonwoven fabric is arranged on the front side to improve cushioning and feel, and the diaper side has In the above, a base made of a liquid-impermeable material is provided to improve the leak-proof property.

[0014]

[Effect of the Invention] The present invention is an elastic composite having both good touch and leakproofness, and is applied to underwear and other clothing.
It is effective in improving the adhesion to the human body and in cushioning and leakproofing.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a perspective view of an example of a material for producing the product of the present invention.

FIG. 3 is an explanatory view of a production example of the product of the present invention.

FIG. 4 is an explanatory view of another production example of the product of the present invention.

FIG. 5 is an explanatory diagram of a diaper to which the invention is applied.

[Explanation of symbols]

 Reference Signs List 1 elastic body 2 base material (liquid impermeable material) 3 base material (nonwoven fabric)

Claims (4)

(57) [Scope of request for utility model registration] 1. A sheet-like elastic body in a relaxed state and a sheet-like base material on both sides of the elastic body, both of which are continuously bonded in a sheet length direction (MD) and in a transverse direction (CD). Are connected with a discontinuity, and the base material has substantially no bonding with the elastic body between the bonding portions with the elastic body.
A channel-like fold is formed so that it can follow when the elastic body is tensioned, and at least the base material on one side of the elastic body is formed of a liquid-impermeable material. Complex. 2. The elastic composite according to claim 1, wherein the elastic body is a polyolefin elastomer having thermocompression bonding properties. 3. The elastic composite according to claim 1, wherein the liquid impermeable material forming the substrate is a polyolefin-based film. 4. The non-woven fabric mainly composed of thermocompression-bondable synthetic fibers is provided on a surface of the sheet-like base made of a liquid-impermeable material of the elastic body opposite to the elastic body. An elastic composite obtained by bonding substrates.