JPS61115702A - Woven fabric reinforced tire - Google Patents

Abstract

PURPOSE:To aim at improvements in lightweightiness, uniformity and durability, by arranging weft to parallel warp at the specified angle, while reinforcing a tire with a woven fabric twisting a fine fabric to a crossed part of both yarn elements in the longitudinal direction of the warp as constitution. CONSTITUTION:Warp 11 is arranged parallelly with one another, while weft 12 is arranged at the one side, without being woven, so as to be crossed to the warp 11 at and angle of 60-90 deg., and a crossing of the warp 11 and weft 12 is twisted with a fine fiber along the longitudinal direction of the warp 11 for weaving whereby reinforced cloth is made up. This warp 11 uses nylon, polyester, etc., while the weft uses a tire fabric weft material. And, as for the fine fiber, such materials being favorable in adhesion, resistible to heat treatment and adhesiveness with rubber, for example, nylon 6 and the like are used. With this constitution, durability and uniformity are improved, not to mention lightweightiness, and it is available for wide range applications from heavy-duty vehicles of trucks, etc., to light cars.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a pneumatic tire having a woven fabric as a reinforcing layer.

(Prior Art) In general, the carcass of a pneumatic tire is made of a fabric in which tire cords, which mainly serve as reinforcing elements, are arranged as warp threads, and the weft threads, which are thinner than the warp threads, are loosely woven to maintain the spacing between the warp threads. .

This blind WA fabric is woven by alternately opening the warp threads, driving the weft threads using a shuttle, beating the warp, reversing the top and bottom of the warp threads, and driving the weft threads in again. In order to manufacture, for example, a pie-astair using a blind fabric, the blind fabric is cut at an angle of 20° to 70＠ with respect to the direction in which the warp threads are arranged, and the pieces are joined together to make a braai. Assembling a cylindrical carcass using at least two of the plies so that the warp threads intersect with each other on the drum;
After that, it is formed into a toroidal tire. In these processes, the warp and weft are not fixed sufficiently, so the warp tends to move (and the ends distribution becomes uneven, which impedes the durability due to the unevenness of the tire. Also, due to its structure, the warp and weft The cords become wavy, creating a so-called "folding face" pattern, and the fabric itself becomes thicker.As a result, to prevent the cords from touching each other, it becomes necessary to increase the thickness of the topping rubber, which makes it difficult to reduce the weight of tires. disadvantageous from that point of view.

Furthermore, since blind fabrics are woven with openings, there is a limit to their raw shearing ability, and it is necessary to select a material that prevents the weft and warp from slipping, making it difficult to use long fibers for the weft.

(Problems to be Solved) The present invention solves these problems at once, and produces pneumatic tires that are lightweight, uniform, and durable, such as for passenger cars, light trunks, trucks, etc., as well as motorcycles, bicycles, low-pressure tires, etc. This project proposes a tire for light vehicles.

(Technical Means) This invention arranges warp threads parallel to each other and intersects the warp threads at an angle of 60 degrees to 90 inches, and inserts fine fibers at the intersection of the warp threads and the weft threads. This tire is characterized by being reinforced with a woven fabric woven in the longitudinal direction of the warp threads.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIGS. 1 and 2 are schematic diagrams of the front and back surfaces of the woven fabric used in the tire of the present invention.

In the figure, the woven fabric (10) has warp threads (11) arranged parallel to each other, and the weft threads (12) on one side of the fabric (10) are arranged almost at right angles to the warp threads (11) without weaving. , a plurality of fine fibers (13
), the warp and weft are integrated to form a woven fabric. The weaving method here can be one that has been widely used in the past for manufacturing blind woven fabrics.

Various materials can be used for the warp yarns, including organic fibers such as nylon, polyester, rayon, and aromatic polyamide, and inorganic fibers such as steel and glass fibers.

Further, the weft yarns are made of weft materials used in blind fabrics, but in the present invention, there is no need to particularly select materials that suppress the movement of the weft yarns, and there is no need to particularly select materials that suppress the movement of the weft yarns. It is sufficient to have a strength that does not break due to the tension up to the rubberizing process, for example, the strength after adhesion treatment is 100 g/d or more.

Furthermore, since the warp yarns slip in plain weave, even long fibers, which are not often used, can be used in the present invention.

Next, the fine fibers used in the present invention may be made of any material that can sufficiently withstand general adhesive treatment and heat treatment conditions in tire manufacturing processes, and preferably can adhere to rubber after treatment, such as nylon 6, nylon 66, Filaments of organic fibers such as polyester with a fiber diameter of 5 to 50 deniers are used, preferably 18 to 1 denier of the warp.
Eight. . A range of deniers can be used. If the filament diameter is smaller than 5 deniers, the fixing strength between the warp and weft is not sufficient.

On the other hand, if the filament diameter exceeds 50 deniers, the thickness of the woven fabric increases, resulting in an increase in blei gauge, which is disadvantageous from the viewpoint of weight reduction, and furthermore, durability decreases due to rubbing between the fine fibers and the warp yarns.

The woven fabric obtained as described above is subjected to conventional adhesive treatment and heat treatment, followed by topping rubber treatment, and the woven fabric is embedded in rubber to form a reinforcing material.

FIG. 3 shows the right half of a cross-sectional view of a bias tire manufactured using the knitted fabric in the carcass ply. Here, the bias tire (To) includes a pair of bead cores (1), two carcass plies (2) and (3) folded around the bead core from the inside to the outside, and the carcass ply and its folded part (2a) ( 3a) with high hardness between
For example, a bid apex (4) having a JIS hardness of 65° to 96° is arranged.

Here, the woven fabric is used for the carcass, unlike the conventional blind fabric.

FIG. 4 shows the right half of a sectional view of a radial tire using a woven fabric for the carcass. In the figure, a radial tire T1 includes a bead core 21, a toroidal carcass 22 and 23 that are secured by folding back their ends around the bead core 21, and cords arranged at a relatively shallow angle in the tire circumferential direction on the outside of the crown of the carcass. a trend part 25 arranged on the outside of the belt layer, a relatively hard part arranged between the carcass 22.23 and its folded parts 22a and 23a, and extending from the bead core 21 in the sidewall direction. A high bead apex 24 is arranged.

Here, the carcass uses the above-mentioned woven fabric, unlike conventional blind fabrics.

When used in radial tires, the fine fiber yarn used has a filament diameter of 5 to 80 deniers. If the denier is less than 5 denier, the fixing strength between the warp and weft is not sufficient. If it exceeds 80 denier, the thickness of the woven fabric will increase, and as a result, the ply gauge will increase, which is disadvantageous from the viewpoint of weight reduction, and furthermore, the durability will decrease due to rubbing between the fine fibers and the warp yarns. The other materials for the fine fibers are the same as described above.

The above reinforcing material can be used in a wide variety of tire reinforcing materials, such as carcass, belt layer, bead reinforcing layer, or chafer, instead of the conventionally used blind woven fabric or plain woven fabric.
In addition, it is suitably used for carcass of radial tires for passenger cars and radial tires for heavy vehicles.

The tire of the invention has the following advantages.

(a) Since the warp and weft of the woven fabric are fixed with fine fibers, the end distribution is uniform throughout the carcass ply processing and molding process, improving the uniformity of the tire and improving its durability.

(b) Since the warp yarns are not woven with the weft yarns, the "folding surface" in blind fabrics is eliminated, and the ply thickness is thin and uniform, which is advantageous for reducing the weight of the tire and improving uniformity.

(C) Since the warp and weft are fixed with fine fibers, thin long fibers can be used for the weft, and the spacing between the wefts can also be made coarser, which reduces the weight of the weft and reduces the processing cost of the weft, resulting in lighter tires. can be achieved.

(d) Weaving shrinkage of the warp threads is eliminated, making it possible to reduce material costs.

Next, the present invention will be explained in more detail by describing Examples, but the present invention is not limited to these Examples.

Example Various woven fabrics were prepared according to the purposes of use shown in Table 1.

The tire size was 185/70R14, and the carcass was made of woven fabric of each specification shown in Table 2 and conventional blind fabric.
We made a prototype of the radial tire for passenger cars shown in the figure. The topping rubber gauge and fiber shrinkage of the ply of each woven fabric, the uniformity of the prototype tire, the durability, etc. were evaluated.

(a) The topping rubber gauge is determined by the cord spacing (A) between the plies and the fifth
As shown in Figure (B), the distance (C) between the cord and the boundary between the adjacent rubber of a different color was measured.In conventional blind fabrics, due to the structure of the "folding surface", the cords in the same ply are wavy. The width (W) is large, and the topping rubber gauge is inevitably large.

(b) When the cord with woven fabric shrinkage length Lo is made into blind fabric or woven fabric, the woven fabric shrinkage is LO (c) Uniformity rims are assembled and the internal pressure is 1.9 kg. /- The filled tire was pressed against the drum with a load of 404 kg, the tire and drum were rotated, and changes in stress in the horizontal and vertical directions with respect to the axle were measured and converted into an index. The smaller the value, the better.

(d) Durability Internal pressure is filled to 1.9 kg/cal, load is 631 kg
The vehicle was run on the drum at 80 kIII/hrs until damage occurred, and the distance traveled was converted into an index.

The larger the value, the better.

[Brief explanation of drawings]

Figures 1 and 2 are schematic diagrams of the front and back surfaces of a woven fabric having wefts in addition to warp yarns, respectively. Figure 3 is a cross-sectional view of a bias tire using the woven fabric for the carcass. Figure 4 is a woven fabric. FIG. 5 is a cross-sectional view of a radial tire using cloth for the carcass. FIG. 5 is an explanatory diagram showing the characteristics of knitted cloth. Patent Applicant Sumitomo Rubber Industries Co., Ltd. Representative Patent Attorney Yoshihira Nakamura Figure 1 Figure 2 II 11 II Figure 3 Figure 4 Figure 5' (A)

Claims (1)

[Claims] (1) The warp threads are arranged parallel to each other, and the weft threads are arranged so as to intersect with the warp threads at 60° to 90° without weaving, so that the fine fibers are entwined at the intersection of the warp threads and the weft threads. A tire characterized by reinforcement with woven fabric woven in the longitudinal direction of the warp.