JP4145195B2 - Synthetic fiber woven fabric for rubber reinforcement and pneumatic tire using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a rubber reinforcing synthetic fiber interwoven fabric and a pneumatic tire using the same, and more specifically, a rubber reinforcing synthetic fiber interwoven fabric exhibiting an effect of improving the uniformity of the pneumatic tire and The present invention relates to a pneumatic tire using the same.
[0002]
[Prior art]
Polyamide fibers, polyester fibers, polyvinyl alcohol fibers or wholly aromatic polyamide fibers have high strength and high elasticity and are excellent in dimensional stability. It is widely used as a rubber reinforcing fiber for tires, belts and hoses.
[0003]
In this case, the reinforcing fiber is a multifilament having a fineness of 1670 dtex or 1100 dtex as disclosed in JP 2000-328387 A or JP 2000-103204 A, for example, taking polyester fiber as an example. Spun yarn or synthetic fiber yarn such as cotton and rayon so that the yarn is twisted and top-twisted to obtain a twisted yarn cord, and this twisted yarn cord is warped and arranged in a range of 1000 to 1500 warps. It is used for rubber reinforcement applications such as tires, belts, hoses, etc. in the form of so-called interwoven fabrics obtained by weaving the wefts made of and the like and weaving so that the weft density is 3-5 yarns / 5 cm.
[0004]
The above weave fabric is given an adhesive, dried and heat-treated and then embedded in various rubbers. At that time, especially when used for reinforcing a pneumatic tire, the shape of the molded tire is used. In order to stabilize, that is, to improve uniformity, it is necessary to arrange the warp cords so that they are at regular intervals.
[0005]
However, the warp yarn located at the end of the interwoven fabric tends to be denser than the central portion of the fabric due to the weft tension during weaving. When such interwoven fabric is used, the tire molding process When forming in an annular shape, there is a problem that the wefts cannot be uniformly stretched with an increase in the space between the warps and the uniformity of the tire is lowered.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-328387
[Patent Document 2]
JP 2000-103204 A
[Problems to be solved by the invention]
The object of the present invention is to solve the above-mentioned problems of the prior art, and when forming an annular shape in the tire molding process, the wefts can be uniformly stretched with an increase in the space between the warp yarns. An object of the present invention is to provide a rubber reinforcing synthetic fiber braid fabric and a pneumatic tire using the same, which have an effect of improving uniformity.
[0009]
[Means for Solving the Problems]
As a result of intensive studies to achieve the above-mentioned object, the present inventors have found that when the initial tensile resistance of the weft near both ends of the interwoven fabric is made lower than the initial tensile resistance of the central weft, the desired interwoven fabric is obtained. The inventors have found out that it can be obtained and have reached the present invention.
[0010]
Thus, according to the present invention, a warp woven fabric in which warp yarns and weft yarns of synthetic fibers subjected to a lower twist and an upper twist are interwoven, and the initial tensile resistance of the weft yarn is the weft yarn of the interwoven fabric. In the direction, a rubber reinforcing synthetic fiber weave fabric is provided which is gradually reduced from the center of the fabric toward both ends of the fabric.
[0011]
Moreover, according to the present invention, there is provided a pneumatic tire characterized by using the above-mentioned synthetic fiber blind fabric as a reinforcing material.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The synthetic fiber used in the present invention is obtained by spinning and stretching a polymer composed of polyamide represented by nylon 6, nylon 66, polyethylene terephthalate, polyester represented by polybutylene terephthalate, and polyvinyl alcohol by a conventional method. Fiber.
[0013]
The above synthetic fibers are desirably drawn using a high-viscosity polymer at a high draw ratio in order to increase the strength.
[0014]
And in order to obtain the textile fabric of the present invention, first, the above-mentioned synthetic fiber is subjected to a lower twist and an upper twist, and this is used as a warp to arrange 1000 to 1500 warps so that these warps are not scattered. It can be obtained by weaving with weft. The width of the weave fabric is 140 to 160 cm, the length is 800 to 2500 m, and the wefts are preferably driven at intervals of 2.0 to 5.0 / 5 cm.
[0015]
Examples of the wefts used in weaving include conventionally known yarns such as spun yarns such as cotton and rayon or synthetic fiber yarns. Among them, finely spun and twisted yarns of polyester fibers and cotton are preferably exemplified. The
[0016]
In the present invention, it is important that the initial tensile resistance of the weft is gradually decreased from the center of the fabric toward both ends of the fabric in the weft direction of the above-described weave fabric. Thus, even if the density of the warp located at both ends of the fabric is higher than that at the center, the initial tensile resistance at both ends of the fabric is reduced as compared with the center. When forming into an annular shape in the process, the wefts are uniformly stretched with an increase in the space between the warp yarns, so that the tire uniformity can be improved.
[0017]
There is no particular limitation on the method for obtaining the wefts having different initial tensile resistances at the both end portions and the central portion as described above, and any conventionally known method can be arbitrarily adopted. It can be obtained by setting the heat treatment temperature in the vicinity of both end portions to be lower than that in the central portion.
[0018]
An adhesive is applied to the woven fabric. Examples of the adhesive to be applied include an adhesive including an epoxy compound, an isocyanate compound, a halogenated phenol compound, and a resorcin polysulfide compound. Specifically, as the first treatment liquid, an epoxy compound and a block isocyanate are used. A method of applying a latex mixed solution, applying a liquid (RFL liquid) composed of an initial condensate of resorcin and formaldehyde and a rubber latex as the second processing liquid after the heat treatment, and further heat-treating is preferably exemplified.
[0019]
For example, in the case of nylon 6 fiber, the drying and heating conditions of the fabric provided with the adhesive are 170 to 215 ° C. for 30 to 90 seconds, preferably 190 to 210 ° C. for 50 to 70 seconds, and in the case of nylon 66 fiber, 200 to 200 ° C. 240 degreeC, 30 to 90 second, Preferably it is 210 to 230 degreeC and 50 to 70 second is good. In the case of polyether, it is treated at 200 to 250 ° C. for 30 to 150 seconds, preferably 210 to 230 ° C. In either case, about 3% stretching is applied.
[0020]
【Example】
Hereinafter, an example is given and the composition and effect of the present invention are explained in detail. In addition, each physical property in an Example is calculated | required by the following method.
[0021]
(1) Initial tensile resistance of wefts According to JIS L 1013 7.10, initial tensile resistances at both ends and the center of the weave fabric after the adhesion treatment were measured. When the initial tensile resistance at both ends was higher than that at the center, it was expressed as “high”, when the same, “same”, and when low, “low”.
[0022]
(2) Uniform warp density The warp density of the interwoven fabric after the adhesion treatment is C (main / inch), the warp density at one end is D1 (in / inch), and the warp density at the other end is D2 (main) / Inch) and expressed as a ratio (unit%) of D1 / C and D2 / C. It can be said that the closer this value is to 100, the better the uniformity.
[0023]
(3) Tire uniformity According to JASOC 607 (automatic tire uniformity test method), a sample tire under conditions of rim (16 × 6.5 JJ), internal pressure (200 kPa), and load (5.50 kN) RFV (Lateral Force Variation) was measured, and relative evaluation was performed using an index when the tire of Comparative Example 1 was set to 100. The smaller the number, the better the uniformity.
[0024]
[Example 1]
Two multi-filaments of 1670 decitex / 250 filaments obtained by melt spinning polyethylene terephthalate having an intrinsic viscosity of 0.95 by a conventional method and drawing at a draw ratio of 5.5 times were obtained. The cord was obtained by twisting with an upper twist of 40 times / 10 cm.
[0025]
Each of these cords was drawn together to obtain warp yarns, and weft yarns made of finely woven spun yarns of polyester fibers and cotton were driven into the yarn at intervals of 5/5 cm to obtain a weave fabric.
[0026]
Next, the tinned fabric is dipped in a mixed solution (first bath treatment solution) composed of an epoxy compound, a block isocyanate compound and a rubber latex, and then dried at 130 ° C. for 100 seconds, followed by 45 ° C. at 45 ° C. Stretch heat treatment was performed for 2 seconds.
[0027]
Further, the brazing fabric treated in the first treatment bath is dipped in a second treatment solution composed of resorcin / formalin / rubber latex (RFL), dried at 100 ° C. for 100 seconds, and then stretched at 240 ° C. for 60 seconds. Heat treatment and relaxation heat treatment were applied.
[0028]
At this time, the heat treatment temperature in the vicinity of both ends of the interwoven fabric is set to 220 ° C. so as to be lower than that in the central portion to produce a synthetic fiber interwoven fabric for rubber reinforcement, and this interwoven fabric is used as a reinforcing material. A pneumatic tire (tire size 225 / 60R16) was manufactured by the method.
[0029]
Table 1 shows the results of measuring the initial tensile resistance of the weft, the uniformity of the warp density, and the tire uniformity in the obtained weave fabric.
[0030]
[Comparative Example 1]
In Example 1, it implemented similarly to Example 1 except having made the heat processing temperature of the end part of the textile fabric the same as the center part.
[0031]
Table 1 shows the results of measuring the initial tensile resistance of the weft, the uniformity of the warp density, and the tire uniformity in the obtained weave fabric.
[0032]
[Comparative Example 2]
In Example 1, it implemented similarly to Example 1 except having set so that the heat processing temperature of the end part textile fabric both ends vicinity was 250 degreeC, compared with the center part.
[0033]
Table 1 shows the results of measuring the initial tensile resistance of the weft, the uniformity of the warp density, and the tire uniformity in the obtained weave fabric.
[0034]
[Table 1]

Claims (3)

A warp woven fabric in which a warp and a weft of a synthetic fiber subjected to a lower twist and an upper twist are interwoven, and the initial tensile resistance of the weft is from the center of the fabric in the weft direction of the interwoven fabric. A synthetic fiber weave fabric for rubber reinforcement characterized by being gradually reduced toward both ends of the fabric. The synthetic fiber weave fabric for rubber reinforcement according to claim 1, wherein the synthetic fiber is a polyamide fiber, a polyester fiber or a polyvinyl alcohol fiber. A pneumatic tire using a synthetic fiber interwoven fabric as a reinforcing material, wherein the synthetic fiber interwoven fabric is the synthetic fiber interwoven fabric for rubber reinforcement according to claim 1.