JPS5951901B2 - Resin coated sheet with high tear strength - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a resin-coated sheet, and more specifically, the present invention relates to a resin-coated sheet having excellent tear strength.

Conventionally, fabrics for truck hoods, jets, and various coverings have been made using a base fabric made of fabric such as canvas, and a waterproofing agent layer on one or both sides, or an organic polymer material such as waterproof synthetic resin or rubber. A composite fabric having a coating layer of

In particular, composite fabrics consisting of a base fabric using multifilament yarns made of synthetic polymers and a coating layer made of organic polymer materials have been recognized to have advantages such as being lightweight, inexpensive, and having excellent tensile strength. ing. However, in the conventional multifilament composite fabric as mentioned above,
The degree of freedom of displacement of the threads within the base fabric is restricted by the covering layer, and therefore, when a large tearing force is applied locally to the fabric, the resistance against this is relatively small. There is. Attempts to improve the tear strength of multifilament composite fabrics include, for example, Japanese Utility Model Application No. 48-2918.
No. 3, No. 48-9886, it is proposed to weave threads with diameters i larger into the base fabric at intervals. However, such large-diameter yarns are not only ineffective in preventing tearing, but also form convex portions on the surface of the fabric, causing the coating layer to peel off or wear out in these areas. This results in disadvantages such as: It is an object of the present invention to provide a composite fabric with a flat surface and excellent tear strength.

The resin-coated sheet with high tear strength of the present invention has a warp layer consisting of a large number of threads arranged parallel to each other in the warp direction, and a large number of threads arranged flat and regular in the weft direction. a base fabric consisting of a weft layer which is superimposed on the warp layer, and a leno thread that is entangled with and connects the warp and weft; and at least one surface of the base fabric. In a resin-coated sheet having a bonded resin coating layer made of an organic polymer material, at least one of the warp layer and the weft layer includes a large number of matrix yarns;
This matrix yarn is comprised of tear-resistant yarns scattered at a rate of 1 to 5 per 25.4 mm, and the tear-resistant yarns have the following properties compared to the matrix yarns:
I) At least one of the following: (1) high tensile strength, (2) high breaking elongation, (3) large breaking work, and (4) low adhesive strength to the resin coating layer. A thing characterized by being satisfying.

In the resin-coated sheet of the present invention, the base fabric is not a normal woven fabric in which warp and weft yarns are woven together, but a large number of warp yarns arranged parallel to each other in the warp direction. It has a warp layer made of yarn and a weft layer made of a large number of weft yarns arranged parallel to each other in the weft direction. They are intertwined and connected.

In such a base fabric, the warp and weft are not directly interwoven with each other, but are only entwined and connected by leno threads, so the degrees of freedom of displacement of the warp, weft, and leno thread are each It is relatively large, and therefore, the base fabric with such a structure also has a relatively high tear strength. However, one side of such a base fabric,
Or, if a resin coating layer is bonded to both sides, the warp, weft, and leno threads are bonded to the resin coating layer, so the degree of freedom of displacement of each is reduced, and the tear strength of the resin coating sheet is also unsatisfactory. Become something. In the resin-coated sheet of the present invention, either one or both of the warp layer and the weft layer is
Consisting of a large number of matrix yarns and tear-resistant yarns scattered in the matrix yarns at a rate of 1 to 5 per 25.4 mm, these tear-resistant yarns have a higher One that satisfies at least one of the following properties: (1) high tensile strength, (2) high elongation at break, (3) large amount of work to break, and (4) low adhesive strength to the resin coating layer. Must.

In the resin-coated sheet having the above characteristics,
When a tearing force acts locally on the sheet, the tear-resistant yarns resist this tearing force due to their high tensile strength, cutting elongation, or breaking work, and/or the tear-resistant yarns By peeling off from the coating layer and displacing it, it is possible to disperse and absorb the tearing force.

The tear resistance of the yarn is (1) 10% higher than the tear strength of the matrix yarn.
higher (especially 20% or more); (2) higher than the breaking elongation of the matrix yarn by 5% or more (especially 10% or more); (3) higher than the breaking work of the matrix yarn.
0% or more (especially 20% or more) larger.

and (4) it preferably satisfies at least one of the following properties: 10% or more (particularly 20% or more) lower than the adhesive force of the matrix yarn to the resin coating layer.

In the sheet of the present invention, most synthetic fibers or natural fibers can be used as the matrix yarns and tear-resistant yarns in the warp and weft layers, and in particular, polyester, vinylon, nylon, cotton, etc. can be used as the material. It is suitable, and the yarn form may be either a multifilament yarn or a spun yarn.

In the case of the tear-resistant yarn, it is particularly preferable that it is a polyester multifilament yarn having a tensile strength of 8.5 g/d or more, a breaking elongation of 15% or more, and a breaking work of 100 g/d・% or more. It is more preferable that the resin coating layer is treated to make it non-adhesive. As the leno yarn, cotton spun yarn, rayon spun yarn, multifilament yarn, or polyester,
Spun yarns or multifilament yarns such as vinylon and nylon fibers are preferred. An example of the structure of the base fabric used in the resin-coated sheet of the present invention is shown in FIG.

In FIG. 1, the warp layers are matrix warp threads 1a,
The weft layer consists of matrix warp threads 2a, 2c, 1c, 1d, . . . and tear-resistant warp threads 1b, 1e... 2d,
2f...... and tear-resistant weft threads 2b, 2e, . . . scattered between them.

These warp threads and weft threads include leno threads 3a, 3b, 3
c, 3e, ...... are intertwined,
As a result, the warp layer and the weft layer are combined into an l-body.
In the sheet of FIG. 1, tear-resistant yarns were included in both the warp layer and the weft layer, but tear-resistant yarns may be included in only one of these layers. The number of tear-resistant yarns is determined by the width 25 of the warp layer and/or weft layer containing them.
．． The number of tear-resistant yarns is 1 to 5 per 4 mm, and the content of the tear-resistant yarns is preferably 2 to 40% of the total number of yarns in the yarn layer containing the tear-resistant yarns. The method of entangling the leno yarns with respect to the warp and weft is not limited to that shown in FIG. 1, but any other entanglement method may be used.

For example, as shown in Figure 1, each leno thread is
It may be intertwined with the adjacent twine, or
Alternatively, they may be independent from each other. Further, only one leno yarn may repeatedly cross one warp thread, or two or more leno yarns may repeatedly cross one warp thread. Now, for example, the matrix yarns of the warp and weft layers have a tensile strength of 8.0 g/d, a breaking elongation of 12%, a breaking work of 96 g/d・%, and an adhesive force to the resin coating layer of 3.
When a polyester filament yarn of 0 g/cm2 is used and a nylon 6 multifilament yarn with a tensile strength of 6 g/d and a breaking elongation of 18% is used as a leno thread, the tear-resistant yarn has a tensile strength of 9 to 10 g/d and a breaking elongation of 15.
It is preferable that the polyester filament yarn is of the same type and satisfies at least one of the following: -20%, breaking work: 135-200 g/d.%, and adhesive strength: 10-20 g/Cm2.

In order to reduce the adhesive strength of the tear-resistant yarn to the resin coating layer, the surface thereof may be subjected to silicone treatment, oil treatment, or the like.

The organic polymer materials forming the resin coating layer include natural rubber, synthetic rubber (neoprene, hypalon, etc.), polyvinyl chloride,
Ethylene-vinyl acetate copolymer, vinyl chloride vinyl acetate copolymer,
Acrylic resin, polyurethane resin, etc. can be used.

In addition to the above-mentioned polymers, the polymeric material may also contain necessary additives such as pigments, fillers, plasticizers, stabilizers, and the like. The coating layer may be formed by any known method, such as applying a paste or liquid containing a polymer material to the surface of the base fabric by impregnation, coating, topping, spraying, etc., and solidifying it; Alternatively, a method may be used in which a film made of the above polymer material is adhered or fused to the surface of the base fabric.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of the structure of the base fabric used in the resin-coated sheet of the present invention. 1a, 1c, 1d... Matrix warp threads,
1b, 1e...Tear-resistant warp threads, 2a, 2c, 2
d, 2f...Matrix weft thread, 2b, 2e
...Tear-resistant weft threads, 3a to 3d... Leno yarn.

Claims (1)

[Scope of Claims] 1. A warp layer consisting of a large number of threads arranged parallel to each other in the warp direction, and a warp layer consisting of a large number of threads arranged parallel to each other in the weft direction, and A base fabric comprising weft layers stacked on top of each other, leno threads entangled with and bonding the warp and weft, and an organic polymer bonded to at least one surface of the base fabric. In a resin-coated sheet having a resin coating layer made of a material, at least one of the warp layer and the weft layer includes a large number of matrix yarns, and a ratio of 1 to 5 matrix yarns per 25.4 mm in the matrix yarns. The tear-resistant yarns have the following properties compared to the matrix yarns: (a) high tensile strength, (b) high elongation at break, and (c) work at break. A resin-coated sheet with high tear strength, characterized in that it satisfies at least one of the following: (d) low adhesive strength to the resin coating layer. 2. The sheet according to claim 1, wherein the tear-resistant yarn has a tensile strength that is 10% or more higher than the tensile strength of the matrix yarn. 3. Claim 1, wherein the tear-resistant yarn has a breaking elongation that is 5% or more higher than the breaking elongation of the matrix yarn.
Sheet with section description. 4. The sheet according to claim 1, wherein the tear-resistant yarn has a breaking work that is 10% or more higher than the breaking work of the matrix yarn. 5. The sheet according to claim 1, wherein the adhesive force of the tear-resistant yarn to the resin coating layer is 10% or more lower than the adhesive force of the matrix yarn to the resin coating layer.