JPS643650B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing an anti-slip rubber band for automobile tires for preventing automobile tires from slipping on snowy, frozen, muddy, or other road surfaces.

That is, rubber or plastic anti-slip belts for automobile tires may be used instead of conventional metal chains to prevent noise and damage to road surfaces. The present invention relates to a method for manufacturing at low cost an anti-slip rubber band for automobile tires which has excellent properties and is simple and easy to attach and detach.

Among conventional anti-slip belts for automobile tires made of rubber or plastic, those made by integrally vulcanizing reinforcing fiber-filled rubber cords into a diagonal mesh using a vulcanization mold have superior anti-slip effects and durability. Although it has excellent performance and drivability, it has the following drawbacks.

It is very difficult to pre-form the unvulcanized rubber string with a reinforcing fiber core so that it matches the recesses of the diagonal mesh formed on the inner surface of the molding mold, so heat vulcanization is used. This process takes a long time because about 15 to 20 meters of unvulcanized rubber string with a reinforcing fiber core is successively fitted into the concave grooves of the diagonal mesh formed on the surface of the mold. In addition, there was a major drawback in molding that the initially charged unvulcanized rubber contracted and deformed due to the heat of the mold, resulting in derailment or premature vulcanization resulting in defective products.

In addition, anti-slip belts for automobile tires vulcanized and molded using conventional methods include metal fittings for attaching wires, ropes, etc. that are attached to automobile tires and tightened to secure them.
It requires about 20 to 35 pieces of work and metal fittings to be attached to both edges. This metal fitting can also cause damage to the aluminum foil of the tire.

Furthermore, the conventional automobile tire anti-slip band is
Another drawback is that it is difficult to install.

The present invention aims to improve the drawbacks of such conventional methods. That is, conventionally, anti-slip rubber bands for automobile tires have been vulcanized and molded using two vulcanization molds, one on the upper and one on the lower side, resulting in the above-mentioned drawbacks.
In addition to the upper and lower two-sided molds, the present invention has
It is characterized by using a medium vulcanization mold with a mechanism that can fix and release two 20mm round steel pieces parallel to each other at a predetermined interval.We have a large number of spares of this medium mold.
By pre-arranging unvulcanized rubber strings containing a reinforcing fiber core into the diagonal cross-shaped mesh, the number of vulcanization steps can be greatly reduced, and both edges of the formed rubber band can be By simultaneously molding string holes using a medium vulcanization mold, it is possible to efficiently and inexpensively manufacture anti-slip rubber bands for automobile tires, which have excellent functions not found in conventional products.

That is, the method for manufacturing an automobile tire anti-slip rubber band of the present invention has a concave groove in which a band-shaped diagonal mesh and a string passage hole passing through both edges of the band-shaped mesh are formed, and Below, an unvulcanized rubber cord with a reinforcing fiber core is placed in a middle vulcanization mold in which two round steel bars with a diameter of 5 to 20 mm are fixed in parallel at a desired interval to a pair of vulcanization molds. A process of winding it so that it has the same mesh shape as the upper and lower molding vulcanization molds, a step of charging it into the upper and lower vulcanization molding molds, and a process of vulcanization molding by applying pressure and heating. The method is characterized in that it consists of a step of forming a diagonal mesh rubber band and string holes at both edges thereof.

The rubber used in the present invention may be either natural rubber or synthetic rubber. Rubber chemicals such as vulcanizing agents are mixed and used. In particular, the strength of the compound with reinforcing agents,
Uses a rubber compound with excellent abrasion resistance, weather resistance, and cold resistance.

The reinforcing fiber core material may be either natural or synthetic fiber, but polyamide and polyester fibers, which have excellent heat resistance and strength, are preferred, and those treated with resorcin formalin latex to improve adhesion to rubber are preferred. Particularly good.

Unvulcanized rubber string with reinforcing fiber core is produced by extruding compounded rubber into a desired shape of string using an extruder, and
An efficient method is to simultaneously extrude a reinforcing fiber core into the center.

The rope for tightening and fixing that is passed through the string holes on both edges of the rubber band is a braided cord or rubber cord made of natural or synthetic fibers.

The present invention will be explained below with reference to Examples.

Example 1 In addition to having a band-shaped diagonal mesh and concave grooves on both edges of which can be formed with string holes, a fifth vulcanization mold was prepared in advance in a shape that matched the concave grooves of the lower pair of vulcanization molds.
As shown in FIGS. a and 5b, unvulcanized rubber cords 12 with reinforcing fiber cores are wound and arranged in the order of numbers 21 to 49 in accordance with the preparation position 9 of the medium vulcanization mold 6.
As shown in FIG. 5c, this is fastened using unvulcanized rubber thread 13 containing reinforcing fibers for fastening to complete the preparation. This preparation can be made in large numbers prior to vulcanization molding. Next, the middle vulcanization mold auxiliary tool 8 is removed from the prepared middle vulcanization mold 6, inserted into the upper and lower vulcanization molds, and heated under pressure with a heat press machine to form vulcanization. Then, the medium vulcanization mold fixing tool 7 is removed from the post-medium vulcanization mold round steel 6, and the medium vulcanization mold round steel 6 is pulled out from the oblique mesh rubber band, resulting in the automobile tire shown in FIG. A non-slip rubber band 1 is obtained. FIG. 2 is a diagram showing this device installed on a tire.

Embodiment 2 In addition to having a band-shaped diagonal mesh and concave grooves on both edges of which can form string holes, a preparation plate 10 was prepared in advance in the lower pair of vulcanization molds as shown in FIG. 6a. The reinforcing fiber cored unvulcanized rubber cord 12 is wound and arranged along the guide pin 11 of the preparation plate according to the steps 51 to 71. Next, Section 5a,
As shown in FIGS. 5b and 5c, it is fastened with an unvulcanized rubber thread 13 containing a reinforcing fiber core for fastening,
Next, as shown in FIG. 6b, both edges of the mesh rubber band are removed from the brace plate guide pin 11.
After passing the medium vulcanization mold round steel 6 through this, it is fixed with a medium vulcanization mold fixture 7.

Next, both edges of the reinforcing fiber cored unvulcanized rubber string 12 are aligned with the preparation position of the medium vulcanization mold to complete the preparation. This preparation can be made in large numbers prior to vulcanization molding.

Next, this prepared middle vulcanization mold is inserted into the upper and lower vulcanization molds, and pressurized with a heat press machine.
After heating and vulcanization molding, the medium vulcanization mold fixing tool 7 is removed from the medium vulcanization mold round steel 6, and the medium vulcanization mold round steel 6 is pulled out from the oblique mesh rubber band. An automobile tire anti-slip rubber band 1 shown in FIG. 3 is obtained. Fourth
The figure shows the device installed on a tire.

In addition to the belt-shaped diagonal mesh of the present invention and the concave grooves on both edges of which can form the string-through holes, a lower vulcanization mold and a diameter of 5 to 20 mm for forming the string-through holes are provided.
An unvulcanized rubber cord with a reinforcing fiber core is molded using a vulcanization mold made up of three people, including a vulcanization mold that can fix and disassemble two round steel rods at a predetermined interval in parallel. The vulcanization mold is prepared in advance so that it is arranged and wound around a band-shaped oblique mesh, and this is inserted into the upper and lower vulcanization molds to perform vulcanization molding. It is characterized in that a large number of string holes are formed in both edges of the molded rubber band in the length direction of the rubber band.

This makes it possible to efficiently and inexpensively manufacture anti-slip rubber bands for automobile tires that have excellent functions not found in conventional products.

In other words, the present invention has advantages.

(1) Since the middle vulcanization mold is prepared in advance with diagonal mesh bands in large numbers prior to vulcanization, the time required to fill the upper and lower vulcanization molds is short, and the vulcanization process is faster. It is efficient and can be produced at low cost and efficiently.

(2) Since the automobile tire anti-slip rubber band of the present invention has string holes on both edges, (a) it does not require the effort and expense of installing a large number of metal fittings for hanging ropes for tightening and fixing, unlike conventional products. Also, this metal fitting prevents damage to rubber strings, aluminum foil, etc.

(b) When the tightening fixing rope passed through the string hole is squeezed before the tire is installed, the anti-slip rubber band for an automobile tire becomes approximately the shape of a tire, that is, the width becomes a semicircle and the length direction becomes a circle. This can be fitted by placing it over the tire from the outside, moving the car forward by 30 to 40 cm, and then tightening the fixing rope sufficiently and attaching it to the tire, so there is no need for jacking up, etc., and it is easy to use. Can be installed.

(3) The automobile tire anti-slip rubber band of the present invention is integrally molded with a strong reinforcing fiber core and reinforced rubber with excellent abrasion resistance and strength in the form of a mesh.
Excellent durability. In addition, because it has an elastic and flexible structure, it is easy to operate and does not generate noise.
Do not damage the road.

[Brief explanation of the drawing]

FIG. 1 is a partial perspective view showing the main parts of a product according to Example 1 of the present invention, and FIG.
FIG. 3 is a partial perspective view showing the main parts of a product according to Example 2 of the present invention, and FIG. 4 is a diagram showing a product according to Example 2 installed on an automobile tire. Figure 5a is a diagram in which unvulcanized rubber strings with a reinforcing fiber core are prepared in a diagonal cross-shaped mesh in the middle mold of Example 1 of the present invention.
Figure b is an enlarged view of the edge of Figure 5a and Figure 5c.
The figure is a diagram in which string passing holes are prepared in the edge of Figure 5a, and Figure 6a is a diagram in which unvulcanized rubber cords containing a reinforcing fiber core are prepared in a diagonal cross-shaped mesh on the provision plate of Embodiment 2 of the present invention. FIG. 6b is a diagram showing the preparation shown in FIG. 6a transferred to a middle mold, and FIG. 6c is an enlarged view of the edge of FIG. 6b. 1... Vulcanized diagonal mesh rubber band, 2
... Vulcanized rubber, 3 ... Reinforcing fiber core, 4 ... String hole on the edge, 5 ... Rope for tightening and fixing, 6 ... Medium vulcanization mold round steel, 7 ... Medium vulcanization mold ( round steel) solid tool,
8... Medium vulcanization mold auxiliary tool, 9... Preparation position of medium vulcanization mold, 10... Preparation plate, 11... Preparation plate guide pin, 12... Unvulcanized rubber string with reinforcing fiber core, 1
3...Unvulcanized rubber thread containing reinforcing fiber for fastening, 21~
49... Wrapping order of unvulcanized rubber string with reinforcing fiber core, 51-71... Arrangement order of unvulcanized rubber string with reinforcing fiber core.

Claims (1)

[Claims] 1. In a method for manufacturing an anti-slip rubber band for automobile tires, upper, lower and paired rubber bands are formed, each having a concave groove in which a band-shaped diagonal mesh and string passage holes passing through both edges of the band-shaped mesh are formed. In the molding vulcanization mold, diameter 5
An unvulcanized rubber cord with a reinforcing fiber core is placed in a middle vulcanization mold in which two ~20 mm round steel bars are fixed in parallel at the desired interval, and the mesh shape is the same as that of the upper and lower vulcanization molds described above. A diagonal cross-shaped mesh rubber band and its both edges are formed by the steps of winding the band so that it becomes symmetrical, placing it in the upper and lower vulcanization molds, and vulcanization molding by applying pressure and heat. A method for producing an anti-slip rubber band for an automobile tire, comprising the steps of: forming a hole for a string to pass through the rubber band;