JPH0757539B2 - Snow tire manufacturing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a snow tire capable of safely traveling on an icy road surface or a snowy road surface and reducing dust pollution on a paved road surface.

[0002]

2. Description of the Related Art Conventionally, when traveling on an icy road surface or a snowy road surface,
Chains are attached to tires or spiked tires are used.

[0003]

However, when a tire of this kind is used on a paved road surface, the road surface is greatly worn out. Especially, spike tires have become a social problem due to dust pollution, and their use has been restricted. is there. Incidentally, in recent years, so-called studless tires have been developed for the purpose of improving the low temperature characteristics of the tread rubber and giving a grip performance similar to that of spiked tires, but they have not been put into practical use yet.

On the other hand, in place of metal spikes used for spike tires, fiber cords such as organic or inorganic cords are used as a reinforcing material to suppress the generation of dust when running on a paved road surface while exhibiting grip performance on a snow and ice road surface. A tire for snow was considered. In addition, when manufacturing this tire, it is conceivable to attach a composite member in which a cord is molded using rubber to the tread rubber as in the case of spikes. However, it is labor intensive and inferior in productivity.

It is an object of the present invention to provide a method for manufacturing a snow tire which can conveniently manufacture a snow tire using a fiber cord as a reinforcing material.

[0006]

DISCLOSURE OF THE INVENTION The present invention is a method for manufacturing a snow tire in which a reinforcing material composed of an organic or inorganic fiber cord is embedded in a tread portion, and the fiber cord is parallel. A sheet forming step of forming a sheet by aligning and topping a rubber material on a sheet, a sheet cut piece forming step of cutting the sheet at a constant longitudinal interval to form a sheet cut piece having both ends as cut surfaces , A tread band forming step of forming a tread band by stacking the cut surfaces of the sheet cut pieces at both ends as upper and lower surfaces, and a tire forming step of manufacturing a snow tire using the tread band. A method for manufacturing a snow tire, which comprises:

[0007]

As described above, since the tread band obtained by stacking the cut pieces of the sheet after the sheet is manufactured in advance is used, the arrangement of the reinforcing material in the sheet, the density,
By adjusting the thickness of the topping rubber, the cutting length, etc., the thickness of the tread rubber, the arrangement of the reinforcing material in the tread rubber, the density, etc. can be accurately set, and the productivity is excellent.

Further, since the fiber cord improves the gripping property and the reinforcing material made of the fiber cord is more flexible than the conventional spikes, it does not damage the road surface and vibrates and impacts due to the contact between the road surface and the spikes. Will be eliminated and it will become a snow tire that improves riding comfort.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 exemplify a snow tire 1 obtained by the manufacturing method of the present invention.

In the snow tire 1, the tread rubber T forming the tread portion 2 is provided with the longitudinal groove G and the lateral groove g, so that the inner row of blocks 3A formed of the blocks 3 passing the equator and the tread edge. Blocks 5 arranged along ...
The outer block rows 5A and 5A and the block row 3
Intermediate block rows 4A and 4A composed of blocks 4 arranged between A and 5A are provided. Block 3 ... 4
In the present example, ..., 5 have a rectangular parallelepiped shape that is long in the circumferential direction and has the same rectangular shape in the plane, and are arranged at equal intervals in the circumferential direction and in the axial direction.

As shown in FIG. 2, the tread rubber T includes all the blocks 3, 4, 5 of each block row 3A, 4A, 5A and the grooves G, g to form the plane of FIG. The reinforcing material 6 is arranged over the entire surface of the tread. Note that, as shown in FIG. 3, the reinforcing material 6 may exclude, for example, a range along the inner block row 3A.

The reinforcing material 6 is an organic fiber cord using a monofilament or a multifilament of an organic material such as nylon, polyester, rayon, or aramid, or an inorganic fiber cord using a multifilament of an inorganic material such as glass or steel. A fiber cord is used.
The diameter of these fiber cords is in the range of 0.3 to 3 mm, and they are arranged on the rubber material 7 forming the tread portion 2 so as to be perpendicular to the tread surface (right angle to the paper surface of FIG. 2). In addition to being perpendicular to the tread surface, a range of inclination angles of about ± 10 degrees is allowed in consideration of the inclination due to rolling of the tire in addition to the case where the angle is 90 degrees with respect to the tread surface.

In the range where the reinforcing material 6 is provided, the volume ratio of the reinforcing material 6 is 5 to 50%. If it is less than 5%, the grip performance on snowy roads will be poor, and if it exceeds 60%, the bonding strength will decrease and damage during running will easily occur. Further, the range where the reinforcing layer 6 is provided is 3 to 30%, preferably 3 to 20% of the total area of the surface of the tread portion 2, that is, the product of the tread width and the tire circumference, on the tread surface of the block. If less than 3%,
The grip performance cannot be maintained, and when it exceeds 30%, the wear characteristics are different from those of the surrounding tread rubber, so that uneven wear of the tread portion 2 occurs and riding comfort is impaired.

Further, such a snow tire can be produced by the production method of the present invention. The present invention includes a sheet forming step,
Sheet cutting piece forming step, tread band forming step,
And a tire forming step. The tire forming process may include a tread band vulcanizing process, a groove forming process, and a laminating process.

In the sheet forming step, the fiber cords 12 which are the reinforcing members 6 are aligned in parallel to form warp yarns, and the weft yarns are appropriately used to form a cord layer woven fabric, for example, a cord layer. In the step of forming a sheet by topping, the conventional sheet forming method can be adopted as it is. In addition, the diameter of the cord, the number of implants, and the thickness of the topping rubber can be adjusted to change the planting density.

The sheet cutting piece forming step is a step of cutting the sheet at a constant longitudinal interval H of the thickness width of the tread portion 2. When the fiber cord is perpendicular to the tread surface, it is cut perpendicularly to the longitudinal direction of the sheet to form sheet cut pieces S ...

The tread band forming step is a raw tread band T in which the fiber cords are laminated at right angles to the upper surface and the lower surface by stacking the cut surfaces of both ends of the sheet S as the upper surface and the lower surface. Refers to the step of forming. In addition, when the fiber cord 12 is formed at a right angle to the tread surface, the fiber cords are laminated on the upper and lower surfaces at right angles without inclining the sheet cut piece S.

Further, when there is a range having no fiber cord, such as the portion of the inner block row 3A shown in FIG. 3, this range is not the sheet cutting piece S described above, but usually has no reinforcing material. It is formed by interposing the rubber sheet of. It is also possible to form a groove by reducing the thickness of such a normal rubber sheet.

Further, as shown in FIG. 3, when the region without the reinforcing material 6 is continuous in the circumferential direction, it is preferable that the width of the sheet is the circumferential length of the tread band in order to reduce the labor of connection.

As shown in FIG. 5, tread bands T are formed by arranging appropriate rubber molding materials 14 on both ends.

Such a tread band can be used to produce a tire by a usual method of molding a green cover with a vulcanizing mold. Further, after the vulcanized and semi-vulcanized tread band is molded into a vulcanized tread band, the groove is processed to form a grooved tread band, and then a tire can be produced.

The groove forming step is a step of forming the vertical groove G and the horizontal groove g by using an automatic or manual grooving machine, and a free groove pattern can be adopted.

A snow tire is formed by a laminating process using such a grooved tread band. The laminating step is a step of laminating the tread rubber T on the base tire BT composed of a reinforcing material such as a bead portion, a carcass and a belt layer via a cushion rubber 9 and an adhesive layer 10 such as rubber glue. As for this method, the technique used in the conventional retreaded tire can be adopted as it is.

The tire of the present invention can be used in various shapes as a block pattern, and can also be used in ribs, block patterns and the like, and the groove is formed after the tread band is attached to the base tire. It can also be formed.

As described above, the arrangement accuracy of the reinforcing material, the cord density, etc. can be easily adjusted by adjusting the cord arrangement density, the sheet thickness, etc., and the snow tire can be manufactured with high productivity.

[0026]

[Specific example] Tire size 165. The tread pattern shown in FIG. 2 was adopted for the tread portion 2 of SR13, and a tire having the specifications shown in Table 1 was prototyped by the manufacturing method of the present invention. Further, conventional spiked tires and non-spiked tires were used as comparative examples.

The results of running tests on snowy and icy roads are shown in Table 1. The tire manufactured by the method of the present invention has excellent snow and ice running properties and is not inferior in strength.
It was found that the introduction of automatic equipment has the productivity that can be put to practical use.

[0028]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, it is possible to accurately set the arrangement and density of the reinforcing material of the snow tire in which the reinforcing material composed of the fiber cord is arranged in the tread rubber, and it is excellent in productivity. In addition, the fiber cord improves grip and the reinforcement made of the fiber cord is more flexible than the conventional spikes, so it does not damage the road surface and eliminates the vibration shock caused by the contact between the road surface and the spikes. The riding comfort is improved.

[Brief description of drawings]

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

FIG. 2 is a plan view showing a tread portion of one embodiment.

FIG. 3 is a plan view showing a tread portion of another embodiment.

FIG. 4 is a perspective view illustrating a seat.

FIG. 5 is a perspective view illustrating a tread band.

[Explanation of symbols]

 2 Tread portion 6 Reinforcement material 7 Rubber material T Tread band BT stand tire

[Table 1]

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical display location B60C 11/14 Z 8408-3D // B29K 105: 08 (56) Reference JP-A-60-166507 (JP, A) JP-A-49-67304 (JP, A) JP-A-50-52705 (JP, A)

Claims (2)

[Claims] 1. A snow tire manufacturing method for manufacturing a snow tire in which a reinforcing material comprising an organic or inorganic fiber cord is embedded in a tread portion, wherein the fiber cords are aligned in parallel and a rubber material is topped. A sheet forming step of forming a sheet by doing the above, a sheet cutting piece forming step of forming a sheet cutting piece having both ends as cutting surfaces by cutting the sheet at a constant longitudinal interval, and cutting the sheet cutting piece at both ends A tread band forming step of forming a tread band by stacking the cut surfaces so that the surfaces are the upper surface and the lower surface, and a tire forming step of manufacturing a snow tire using the tread band. Tire manufacturing method. 2. The tire forming step is a tread band vulcanizing step of forming a vulcanized tread band which is integrated by vulcanizing and semi-vulcanizing the tread band, and the vulcanized tread band is automatically or manually operated. The method for manufacturing a snow tire according to claim 1, further comprising a groove forming step of forming grooves to form a grooved tread band, and a laminating step of attaching the grooved tread band to a base tire.