JPH02118180A - Processing method for cord fabric for rubber reinforcement - Google Patents

Abstract

PURPOSE:To obtain the title high-grade, flexible fabric causing no warpage and/or undulation phenomena by putting a cord fabric for rubber reinforcement to at least two stages of adhesive treatment and by making a flexibilizing treatment each time at drying and heat treatment. CONSTITUTION:A cord fabric for rubber reinforcement is put to at least two stages of adhesive treatment using e.g., a RFL-, epoxy-based adhesive, and also to flexibilizing treatment each time at drying and heat treatment, using a flexibilizing edge with its tip beveled, under specified tension, thus obtaining the objective high-grade cord fabric for rubber reinforcement causing no warpage and/or undulation phenomena.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention provides a method for processing a rubber reinforcing blind fabric, and more specifically, a method for processing a rubber reinforcing blind fabric that is high quality and flexible without warping or waviness. Regarding the processing method obtained.

[Conventional technology]

Rubber reinforcing blind fabrics (hereinafter referred to as "blind fabrics") have been widely used as reinforcing materials for tires, belts, and other various rubber products.
In general, the cords that make up the bamboo blind fabric become hard and lose flexibility due to heat treatment after adhesive treatment in the manufacturing process, which causes problems in post-processing processes such as tosoping and forming processes. There are 9 letters.

Therefore, in order to soften the blind fabric that has been hardened by the adhesive treatment and subsequent heat treatment, various softening treatments,
For example, there are known processing methods in which a bending member or a bending member in the shape of a tubular or round bar is used (Japanese Patent Publication No. 47-21280, Japanese Unexamined Patent Application Publication No. 56-4767, Japanese Unexamined Patent Publication No. 62-149983). ing.

Although these conventional softening treatments are certainly effective in softening blind fabrics made of fiber cords that have relatively good adhesion to rubber, these softening treatments can cause warps and undulations in blind fabrics. and its quality deteriorates,
There is a problem in that the handling properties are deteriorated in the tosoping process and the molding process. In particular, in the case of blind fabrics made of fibers with low adhesion to rubber, such as polyester fiber cords, which are treated with at least two stages, usually two stages, good flexibility can be imparted. At the same time, it was difficult to prevent warping and waviness of the blind fabric.

[Problem to be solved by the invention]

An object of the present invention is to soften the above-mentioned blind fabrics, especially rubber reinforcing blind fabrics made of fiber cords that have low adhesiveness and are treated with at least two stages of adhesive, without causing warping or waviness. It is an object of the present invention to provide a processing method capable of producing a blind fabric with excellent handleability and high quality.

[Means to solve the problem]

The method of processing the rubber reinforcing blind fabric of the present invention that achieves such an object is to subject the rubber reinforcing blind fabric to at least two stages of adhesive treatment, and to soften it each time it is dried and heat treated. It is characterized by

First, the present invention is constructed of a fiber cord that is subjected to at least two stages of adhesive treatment, and that the degree of hardening of the cord caused by the adhesive treatment is large, and that warping and warping caused by the softening treatment is prevented. The target is blind fabrics with noticeable deterioration in quality such as waviness, such as blind fabrics made of polyester fiber cords.

It is important that the curtain fabric of the present invention, which is made of fiber cords subjected to such two-step adhesive treatment, be subjected to each adhesive treatment and softened each time it is dried and heat treated. It is.

In other words, the softening treatment is performed only once, for example, the softening treatment is applied only when the first stage adhesive is applied and the drying/heat treatment is performed, and the softening treatment is performed only after the second stage adhesive treatment - drying/heat treatment. Either no softening treatment is applied, or after the first stage adhesive is applied and drying and heat treatment is performed, the second stage adhesive treatment is applied and softening treatment is performed only when drying and heat treatment is performed. However, the effect is small, and a blind fabric with sufficient flexibility cannot be obtained. In these cases, if excessive softening treatment is forcibly performed, noticeable warping or strong undulations will occur in the blind fabric, greatly reducing its quality. In the present invention, the flexibility of the resulting blind fabric is effectively reduced only by applying a softening treatment to the blind fabric each time the adhesive is applied in the at least two stages, and each time the drying and heat treatment are performed. This can prevent warping and waviness from occurring.

In the present invention, the post-drying heat treatment applied to the adhesive-treated M fabric includes baking only in the first stage and not baking the set (although it may be possible to do so in the first stage). The second stage is preferably for baking and setting.

Thus, as a softening treatment applied to the dried and heat-treated blind fabric of the present invention, as shown in FIG. The blind fabric S is supplied to a softening process in which softening edges 38, 3□, 33.34 and a tension detection roller 4 are arranged, and the blind fabric S is passed through the plurality of softening edges 31.3 under a predetermined tension (T). A method of squeezing while alternately bending with □, 3s, and 34 is preferable.

In this case, the tip of the softening edge must be chamfered as shown in Figure 2, and preferably the radius (R) of the tip of the edge is 0.2 mm = 15 m +
It is desirable to chamfer to about n. This R is 0.2m
If it is smaller than m, there is a risk that it will be damaged by the softening treatment depending on the tension of the blind fabric, and if it exceeds about 15 mm, the softening effect will decrease, which is not preferable.

The degree of softening of this blind fabric is related to the number of softening edges (N) and the angle (θ) of the blind fabric rubbed by the softening edges, but the number of softening edges (N) is 2～
It is preferable to use four pieces and set the angle (θ) within the range of 706 to 150 degrees.

In addition, the tension (T) of the blind fabric in the softening process, for example, the tension (T) on the exit side of the device (between the tension detection roller 4 and the pull-out roller group 2), is the tension (T) of the cord making up the blind fabric. It can be selected and determined as appropriate by considering the type, weave structure, etc.

In addition, the adhesive treatment of the present invention can be carried out by appropriately combining known adhesives used with rubber reinforcing fiber cords or blind fabrics thereof, such as the above-mentioned RF/L adhesive, epoxy adhesive, and isocyanate adhesive. Known processing methods and processing conditions can be applied, and there are no particular limitations. .

In addition to the polyester fiber cords mentioned above, the fiber cords constituting the rubber reinforcing screen fabric of the present invention include aromatic polyamide fiber cords such as "Kevlar" manufactured and sold by DuPont in the United States. I can give an example.

〔Example〕

Hereinafter, the present invention will be explained in more detail based on Examples.

Examples 1 to 3, Comparative Example 1 A blind fabric made of polyester fiber cord of 1500 D/2 was immersed in an adhesive treatment solution containing an epoxy compound, rubber latex, etc. and having a solid content of 15χ to prepare the first stage adhesive. After the treatment, under tension with a stretching ratio of 5z, 10
It was dried at 0° C. for 90 seconds and further heat-treated at 245′C for 30 seconds under tension with a stretching ratio of 5χ. The softening treatment equipment shown in Fig. 1 is used for the blind fabric that has been subjected to the first adhesive treatment, drying and heat treatment, and the degree of chamfering (Rmm) of the softened edges is determined. Number (N),
The ironing angle (θ°) of the blind fabric and its tension (Tg/
The first stage of softening treatment was applied to the material (Book) with the changes shown in the table.

Next, the solid content of this softened fabric was reduced to 9.0.
χ resorcinol/formalin/rubber latex (RF/
After being immersed in an adhesive treatment solution containing L) as the main component and subjected to the second stage treatment, it was stretched at 100°C under tension with a stretching ratio of 5χ.
Dry by heating for 0 seconds, and then under tension with a stretching ratio of 5χ,
Heat set at 45℃ for 30 seconds, and then reduce the stretching rate (
-) Heat at 245°C for 30 seconds under 2.0χ 1. Fixed. After applying this second-stage adhesive treatment, the dried and heat-set blind fabric is softened using the softening treatment device shown in Figure 1, and the degree of chamfering of the softened edge (Rn+11+) is applied.
, the number (N), the ironing angle (θ6) of the blind fabric, and its tension (Tg/one cord) were changed as shown in the table, and the second stage softening treatment was performed.

The hardness and quality of the blind fabric thus obtained are shown in the table.

In the table, the hardness of the cord constituting the softened blind fabric is a value measured using a taper device Model 150B manufactured by Taper Co., Ltd., USA.

In addition, the quality of the blind fabric after the softening treatment is determined based on the quality judgment criteria (Fig. 3 A, B, C, and D) showing four types of blind fabrics with different warping and waviness occurrence conditions. I judged it. As is clear from the figure, the order of quality is A>B>C>D.

(Hereafter, margin)

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing an example of the softening process used in the present invention, Fig. 2 is a cross-sectional view showing an example of the softening edge, and Fig. 3 is a cross-sectional view showing an example of the softening edge. FIG. 2 is a plan view of the blind fabric shown in FIG. ■... Supply roller, 2... Pull-out roller group, 3...
... Softening edge 3.4... Tension detection roller. Agent Patent Attorney Nobuo Ogawa −

Claims (1)

[Claims] A method for processing a rubber reinforcing blind fabric, characterized in that the rubber reinforcing blind fabric is subjected to at least two or more stages of adhesive treatment, and a softening treatment is performed each time drying and heat treatment are performed.