JPH0351204B2 - - 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, in order to prevent noise and damage to the road surface, rubber or plastic anti-slip belts for automobile tires can be considered in place of conventional metal chains. The present invention relates to a method for inexpensively producing an anti-slip rubber band for automobile tires, which has excellent properties and is simple and easy to attach and detach.

Among conventional rubber and plastic anti-slip rubber bands for car tires, many have a ladder shape, but these have the disadvantage that the car vibrates a lot while driving, making it difficult to drive, especially in front-wheel drive cars. There is.
Among automobile tire anti-slip rubber bands made of rubber or plastic, rubber cords containing reinforcing fibers are integrally vulcanized and molded using a vulcanization mold to form a predetermined mesh pattern, which has an anti-slip effect. Although it has excellent durability and drivability, it has the following drawbacks.

The unvulcanized rubber string containing a reinforcing fiber core can be preformed into a mesh in advance so that it can be fitted into a vulcanization molding groove having a predetermined mesh pattern provided on the inner surface of a vulcanization mold for vulcanization molding. Because it is very difficult
In line with the vulcanization molding groove provided in the hot vulcanization mold,
This process takes a long time, as approximately 15 to 20 m of unvulcanized rubber string with a reinforcing fiber core is successively fitted into the vulcanization molding groove. For this reason, expensive vulcanization molds and press vulcanizers can only be operated between preparations, resulting in extremely low productivity. In addition, for this reason, by the end of the preparation, the unvulcanized rubber cord that is initially prepared may shrink and deform due to the heat of the mold, causing derailment or premature vulcanization, resulting in defective products. There are drawbacks.

In addition, an automobile tire anti-slip rubber band, which is vulcanized and molded by a conventional method and has a net-like pattern in which vulcanized rubber strings intersect diagonally with each other, can be attached to an automobile tire and attached with a wire or rope for tightening and fixing. This requires the labor and expense of attaching approximately 20 to 35 metal fittings to both ends of the rubber band. Therefore, this metal fitting can cause damage to the aluminum wheel of the tire.

Furthermore, conventional automobile tire anti-slip rubber bands have the disadvantage that they are difficult to attach to tires.

The present invention aims to improve the drawbacks of the conventional methods and provide a method for manufacturing an automobile tire anti-slip rubber band that can be manufactured easily, without much effort, and at low cost.

That is, conventionally, anti-slip rubber bands for automobile tires were vulcanized and molded using a vulcanization mold consisting of two surfaces, an upper and a lower surface. As a result, we have completed the present invention.

The present invention provides a process for preparing an unvulcanized rubber cord having a reinforcing fiber core; and a medium vulcanization mold having an outer frame and a plurality of protrusions protruding from an inner wall surface of the outer frame. , prepare a medium vulcanization mold in which the plurality of protrusions are arranged in the longitudinal direction of the medium vulcanization mold, and each protrusion is provided with a core metal, A preform support mold in which a preform groove having a net-like pattern corresponding to the planar shape of the stopper rubber band is formed is installed inside the outer frame of the medium vulcanization mold, and the unvulcanized rubber string is By alternately repeating the operation of storing the unvulcanized rubber string in the preforming groove and the operation of winding the unvulcanized rubber string around the core bar and changing the direction, the unvulcanized rubber string forms the net-like pattern. This unvulcanized rubber string is positioned in the preforming groove so as to form a rubber band preformed body having the net-like pattern. and then removing the preform preparation mold from the medium vulcanization mold; and curing the rubber band preform held by the core metal of the medium vulcanization mold. The present invention relates to a method for producing a non-slip rubber band for an automobile tire, which includes a vulcanization molding process to obtain an anti-slip rubber band for an automobile tire.

As a result, the number of vulcanization steps can be significantly reduced, and the efficiency of the vulcanization mold and press vulcanizer can be improved.

In addition, since the vulcanized anti-slip rubber band for automobile tires has string holes on both edges, it requires the labor and expense of attaching a large number of metal fittings to attach and secure it to the automobile tire. First, it has the advantage of being able to efficiently and inexpensively manufacture anti-slip rubber bands for automobile tires, which have excellent functions not found in conventional products.

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, a rubber compound containing a reinforcing agent such as carbon black and having excellent strength, abrasion resistance, weather resistance, and cold resistance is used.

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

An efficient method for producing an unvulcanized rubber string with a reinforcing fiber core is to use an extruder to extrude the compounded rubber into a string of a desired shape, and simultaneously extrude the reinforcing fiber core into the center of the string.

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 and drawings.

Example In this example, an anti-slip rubber band for an automobile tire is manufactured in the following order of steps.

Process of preparing an unvulcanized rubber string with a reinforcing fiber core A compounded rubber with high strength, wear resistance, and cold resistance is kneaded and fed to an extruder. This is rolled into a ribbon shape.

A ribbon-shaped compounded rubber and nylon threads treated with resorcinol and formalin latex are supplied to an extruder to extrude and mold an unvulcanized rubber string with a reinforcing fiber core in a predetermined shape and size.

Preforming process First, a medium vulcanization mold 9 as shown in FIG. 3 is prepared. In this medium vulcanization mold 9, a plurality of plate-shaped hollow portions 9 are provided on an inner wall surface 9c of an outer frame 9a having a rectangular plan view.
b, and a plurality of plate-like protrusions 9b are arranged in the longitudinal direction of the medium vulcanization mold 9.
At this time, plate-like protrusions 9b are formed on mutually opposing long sides of the outer frame 9a, which is rectangular in plan.
Each protruding portion 9b is provided with a substantially cylindrical core bar 10 extending substantially parallel to the longitudinal direction of the medium vulcanization mold 9.

Next, as shown in FIGS. 4a and 4b, a preform preparation mold 11 having a preform groove 13 formed on its surface having a net-like pattern corresponding to the planar shape of an automobile tire anti-slip rubber band is prepared, This preform preparation mold 11 is installed inside the outer frame 9a of the medium vulcanization mold 9. At this time, the widthwise dimension of the preform preparation mold 11 is set to a size that allows the preparation mold 11 to be accommodated between the opposing protrusions 9b.

Next, unvulcanized rubber strings (not shown) are accommodated in the groove 13 by being fitted into the preforming groove 13 in order from knitting order number 21, and the core bar located at knitting order number 22 is inserted into the groove 13 for preforming. Wrap the unvulcanized rubber string around 10, change the direction, fit the unvulcanized rubber string into the preforming groove 13 again up to the position of knitting order number 23, and wrap the unvulcanized rubber string around the core bar 10 at the position of knitting order number 23. The direction is changed by wrapping a vulcanized rubber string around it. These two types of operations are repeated and alternately performed until reaching the position of knitting sequence number 61, and the unvulcanized rubber string is positioned within the preforming groove 13 so that the unvulcanized rubber string forms a net-like pattern. do. Then, a crimping machine having a large number of claws is used to enable simultaneous crimping, and each of these claws is crimped to a large number of intersections where the unvulcanized rubber strings intersect with each other, thereby forming a net-like pattern. A rubber band preform is produced.

Next, the preform preparation mold 11 is placed in a medium vulcanization mold 9.
When removed, the state shown in FIG. 5 is obtained. That is, the reinforcing fiber cored unvulcanized rubber cord 17 is preformed according to the mesh pattern of the preforming grooves 13, thereby obtaining a rubber band preformed body 16. The rubber band preform 16 has a large number of intersections 16.
a is formed, and the unvulcanized rubber strings 17 are crimped together at each intersection 16a. Further, the unvulcanized rubber cord 17 is wound around the core metal 10, and the rubber band preform 16 is held by the winding portion 16b formed in this way. In this way, the rubber band preform 16 is taken out while being set in the medium vulcanization mold 9.

In addition, in this preforming step and the next vulcanization molding step, a plurality of middle vulcanization molds 9 are prepared for one set of the upper vulcanization mold 7 and the lower vulcanization mold 8. If molding is performed and one rubber band preform is prepared while another rubber band preform is being vulcanized, there is no play time in the vulcanization mold, resulting in good work efficiency.

Vulcanization Molding Step Next, the rubber band preform 16 held by the core metal 10 of the medium vulcanization mold 9 is vulcanized and molded to obtain an automobile tire anti-slip rubber band.

Specifically, as shown in FIGS. 6a and 6b, a lower vulcanization mold 8 is prepared in which a vulcanization molding groove 12 having the same net-like pattern as the preforming groove 13 is formed. The groove width of the preforming groove 13 is the same as that of the vulcanization forming groove 1.
Make the groove width 1 to 3 mm wider than the groove width of 2, and the depth of the groove is also about 2.
Make it twice as big.

The lower vulcanization mold 8 is installed inside the outer frame 9a from the lower side of the middle vulcanization mold 9, and the rubber band preform 16 is accommodated in the vulcanization molding groove 12, and then the lower vulcanization mold The upper vulcanization mold 7 is fitted and installed on the vulcanization molding groove 12 side (upper surface side) of 8. When the upper vulcanization mold 7 and the lower vulcanization mold 8 are fitted together, side grooves 14 are formed at predetermined positions on the widthwise ends of the vulcanization molds. Each of the side grooves 14 accommodates a corresponding plate-like protrusion 9b and core bar 10, respectively. In this state, the rubber band preform 16 is subjected to pressure treatment and heat treatment using a press vulcanizer, and is vulcanized.

After the vulcanization molding process is completed, the upper vulcanization mold 7 is removed, and then the middle vulcanization mold 9 and the automobile tire anti-slip rubber band held therein are removed from the lower vulcanization mold 8. Next, when the rubber band is removed from the medium vulcanization mold 9, an automobile tire anti-slip rubber band 1, a part of which is shown in FIG. 1, is obtained. FIG. 2 is a diagram showing this device installed on a tire.

That is, in the vulcanized rubber network band 2, there is a reinforcing fiber core 3.
The vulcanized rubber net-like body 2 has many intersections 1a where the vulcanized rubber strings intersect with each other and are integrated.

At both ends of the vulcanized rubber network band 2 in the width direction,
A plurality of string hole forming portions 4 are provided respectively.
Needless to say, this string passing hole forming part 4 is the fifth
Winding portion 1 in the rubber band preform 16 shown in the figure
6b was formed by vulcanization molding.
These plurality of string passing hole forming portions 4 are arranged in the longitudinal direction of the vulcanized rubber net-like band 2, and a string passing hole 5 is provided in each of these plurality of string passing hole forming portions 4. At both ends of the vulcanized rubber mesh band 2 in the width direction, one string is passed through a plurality of string holes 5, respectively.

That is, the present invention has the following advantages.

(1) Conventionally, unvulcanized rubber string is placed in a vulcanization mold and then vulcanization is performed in the same vulcanization mold, which requires expensive vulcanization molds and press vulcanization machines. The operating time is short, and time is consumed in preparing the unvulcanized rubber string.

In the present invention, a rubber band preform made of unvulcanized rubber string is prepared prior to vulcanization, held in a middle vulcanization mold, and the rubber band preform is charged into a lower vulcanization mold. The charging time for the sulfur mold itself is short, the production capacity of the expensive vulcanization mold and press vulcanizer is high, the vulcanization efficiency is high, and production can be carried out at low cost and efficiently.

(2) As shown in Fig. 5, the core metal 1 of the medium vulcanization mold 9
0 to hold the wrapped portion 16b of the rubber band preform 16, and thereby the rubber band preform 16 can be held within the outer frame 9a without losing its shape. By using a preform preparation mold with grooves, it is possible to prepare a preform that perfectly matches the vulcanization molding grooves of the lower vulcanization mold, and it is possible to efficiently vulcanize and mold without producing defective products. can. Furthermore, since each core bar is short, it is easier to remove the rubber band after vulcanization molding than from a medium vulcanization mold.

(3) As shown in Fig. 1, the automobile tire anti-slip rubber band 1 has a hole through which a string is passed, which is not found in conventional products. It does not require the effort and expense of installing multiple devices.

Also, this metal fitting prevents damage to rubber strings, aluminum wheels, etc.

(b) Before mounting the tire 15, the tightening fixing rope 6 passed through the string passing hole 5 at the end in the width direction is used in a tightened state, so the rubber band 1 approximates the shape of the tire. That is, when the tightening fixing rope 6 is tightened, the shape of the rubber band 1 approximates the shape of the outer peripheral surface of the tire as shown in FIG. Apply the rubber band 1 in this state to the tire surface from the outside of the tire, cover it and fit it,
Move the car forward or backward by 30 to 40 cm to sandwich a part of the rubber band 1 between the tire and the road surface, then fix both lengthwise ends of the rubber band 1 together and tighten the fixing rope 6. By splicing, the rubber band 1 can be attached to the tire 15 (see FIG. 2). Therefore, the rubber band 1 can be easily and easily attached to the tire 15 without jacking up the tire.

(4) The anti-slip rubber band for automobile tires obtained by the manufacturing method of the present invention is made by combining a strong reinforcing fiber core and reinforced rubber with excellent wear resistance and strength in a predetermined net pattern. Because it is integrally molded, it has excellent durability.

In addition, because it has a net-like pattern in which vulcanized rubber strings are crossed diagonally with each other, and because it has an elastic and flexible structure, there is no vibration, making it easy to drive, generating no noise, and not damaging roads.

[Brief explanation of drawings]

FIG. 1 is a partial perspective view showing an automobile tire anti-slip rubber band obtained by the manufacturing method of the present invention, and FIG.
The figure is a perspective view showing the state in which the automobile tire anti-slip rubber band shown in Fig. 1 is attached to the tire, Fig. 3 is a perspective view of the medium vulcanization mold, and Fig. 4a is the outside of the medium vulcanization mold. A perspective view showing a state in which a preform preparation mold is installed inside the frame, FIG. Fig. 6a is a perspective view showing a state in which the middle vulcanization mold is held, and a portion showing a state in which a lower vulcanization mold is installed inside the outer frame of the middle vulcanization mold, and an upper vulcanization mold is further installed. FIG. 6b is a broken perspective view (the rubber band preformed body is not shown) and a cross-sectional view taken along line A-A and line B-B in FIG. 6a. 1... Car tire anti-slip rubber band, 1a...
Intersection where vulcanized rubber cords intersect, 2... Vulcanized rubber mesh band, 3... Reinforcing fiber core, 4... Strap passing hole forming part, 5... Strand passing hole, 6... Tightening fixed rope (String), 7...Top vulcanization mold, 8...Bottom vulcanization mold,
9...Medium vulcanization mold, 9a...Outer frame of the medium vulcanization mold,
9b...Plate-shaped protrusion provided on the inner wall surface of the medium vulcanization mold, 9c...Inner wall surface of the medium vulcanization mold, 10...An unvulcanized rubber string is wound around the string during the vulcanization process. Core metal for forming through holes, 11... preform preparation mold,
12...Vulcanization molding groove having a net-like pattern corresponding to the planar shape of an automobile tire anti-slip rubber band,
13... Preforming groove having the above-mentioned net-like pattern, 14... Side groove accommodating the plate-shaped protrusion, 15...
...Automobile tire, 16...Rubber band preformed body made by knitting unvulcanized rubber string, 16a...Intersection part (crimping treatment part) of rubber band preformed body, 16b... Core metal of unvulcanized rubber string The wrapping part.

Claims (1)

[Claims] 1. Step of preparing an unvulcanized rubber cord having a reinforcing fiber core; A medium vulcanization mold having an outer frame and a plurality of protrusions protruding from the inner wall surface of the outer frame. preparing a medium vulcanization mold in which the plurality of protrusions are arranged in the longitudinal direction of the medium vulcanization mold, and each of the protrusions is provided with a core metal; A preform support mold in which a preform groove having a net-like pattern corresponding to the planar shape of an automobile tire anti-slip rubber band is formed is installed inside the outer frame of the medium vulcanization mold, and the unvulcanized By alternately repeating the operation of storing the rubber string in the preforming groove and the operation of winding the unvulcanized rubber string around the core metal and changing the direction, the unvulcanized rubber string is The unvulcanized rubber strings are positioned in the preforming grooves so as to form the net-like pattern, and the intersections where the unvulcanized rubber strings intersect with each other are crimped to form a rubber band having the net-like pattern. A preforming step of producing a preform, and then removing the preform support mold from the medium vulcanization mold; and the rubber band preform held by the core of the medium vulcanization mold. It has a vulcanization molding process to obtain a non-slip rubber band for automobile tires by vulcanization molding the body.
A method for producing anti-slip rubber bands for automobile tires. 2. In the vulcanization molding step, a lower vulcanization mold in which a vulcanization molding groove having the net-like pattern is formed is prepared, and this lower vulcanization mold is installed from the bottom of the middle vulcanization mold. , the rubber band preform is accommodated in the vulcanization molding groove, and then an upper vulcanization mold is installed on the vulcanization molding groove side of the lower vulcanization mold, and in this state, the rubber band preforming is performed. 2. The method for producing an anti-slip rubber band for an automobile tire according to claim 1, wherein the rubber band preform is vulcanized and molded by subjecting the rubber band to pressure treatment and heat treatment.