JPS6290228A - Manufacture of non-skid rubber belt of car tire - Google Patents

Abstract

PURPOSE:To provide a manufacture of a non-skid rubber belt of a car tire which can be manufactured easily and inexpensively, by making use of an intermediate vulcanizing mold whose core metal of each of the intermediate vulcanizing molds forming each of holes passing strings through is in structure unified with an intermediate vulcanizing mold frame in addition to a vulcanizing molds of a pair of a top and bottom two surfaces having meshes in a beltlike and diagonally crossing state and a recessed state groove, in which the hole part passing the string through can be molded on both fringes of the beltlike meshes. CONSTITUTION:An unvulcanized rubber string containing a reinforcement fiber core 3 in diagonally crossing meshes is arranged in a meshy and recessed state groove 12 of a bottom vulcanizing mold 8, a communicating groove 14 between a core metal and an outer frame and an intermediate vulcanizing mold 9, over which a top vulcanizing mold 7 is fitted, and vulcanization molding is performed by pressing and heating the same. After completion of the vulcanization molding, when the top vulcanizing mold 7 is removed, the intermediate vulcanizing mold 9 and a meshes molding rubber belt are removed from the bottom vulcanizing mold 8 and the meshes molding rubber belt is removed from the intermediate vulcanizing mold 9, then a non-skid rubber belt 1 of a car tire having a large number of holes 5 passing strings through can be produced efficiently and inexpensively.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an anti-slip rubber band for automobile tires for preventing automobile tires from slipping on road surfaces such as sand, ice, and mud.

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. This invention relates to a method for inexpensively manufacturing an automobile tire anti-slip rubber band that has excellent properties and is simple and easy to remove. However, these have the disadvantage that the car vibrates a lot while driving, and especially in front-wheel drive cars, the image pickup is large and difficult to drive. Made of rubber,
Inside the plastic car tire non-slip rubber band,
Rubber cords containing reinforcing fibers are integrally vulcanized into diagonal cross-shaped mesh using a vulcanization mold, and have excellent anti-slip effects, durability, and maneuverability, but they have the following drawbacks: It is extremely important to preform the mesh of the unvulcanized rubber string containing a reinforcing fiber core so that it fits into the concave grooves of the diagonal mesh provided on the inner surface of the vulcanization mold for vulcanization molding. Therefore, in order to fit approximately 15 to 20 m of unvulcanized rubber string with a reinforcing fiber core into the concave grooves of the diagonal mesh made in the hot vulcanization mold, this process is difficult. It takes a long time.

For this reason, there is a drawback that the productivity of expensive vulcanization molds and press vulcanizers is extremely low. In addition, for this reason, by the end of the preparation, the unvulcanized rubber cord that is initially prepared will shrink and deform due to the heat of the mold, causing derailment or premature vulcanization, resulting in defective products. There are drawbacks.

In addition, the anti-slip belt for automobile tires with diagonal cross-mesh numbers, which is vulcanized and molded by the conventional method, does not have strings on both edges, so it cannot be attached to the automobile tire and fixed by tightening.
Or attach the metal fittings to the rope in equal parts, about 20 to 35 mm on both edges.
As a result, these metal fittings cause damage to the aluminum foil of the tire.

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

It is an object of the present invention to provide a method for manufacturing an ear anti-slip rubber band.

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.
Taking note of the above-mentioned drawbacks, the inventors of the present invention have completed the present invention as a result of intensive research.As can be seen in the drawings, the embodiment of the present invention is a belt-shaped oblique cross-shaped structure. In addition to the upper and lower pair of two-sided vulcanization molds having a mesh and concave grooves on both edges of this belt-like mesh into which string-passing holes can be formed, a vulcanization mold for forming each string-passing hole is used. By adding a medium vulcanization mold with a structure in which the core metal of the vulcanization mold is integrated with the medium vulcanization mold frame, a diagonal cross-shaped mesh rubber band and a long length are formed on both edges of this mesh. It is characterized by being vulcanized and molded integrally with a large number of string passing holes oriented parallel to the direction, and as a pre-process, the lower vulcanization mold is formed with diagonal cross-shaped mesh opening grooves excluding the string passing holes. A preliminary medium vulcanization mold was placed around the outer periphery of the mesh preparation mold, which had the same shape but a concave groove with a slightly wider groove depth and a deeper groove depth, and a preliminary medium vulcanization mold was placed around the outer periphery of the mesh preparation mold. Insert the vulcanized rubber cord along the mesh of the mesh preparation mold, hook it around the core metal of the medium vulcanization mold at both edges of the mesh, turn it over, and repeat the operation of fitting it along the concave groove of the mesh, sequentially. After knitting the mesh, the intersecting parts of the mesh are crimped and the mesh is changed in advance. It can also improve the efficiency of the press vulcanizer.In addition, the vulcanized diagonal mesh rubber band has string holes on both edges, so it can be attached to and fixed on automobile tires. To provide an anti-slip rubber band for automobile tires that does not require the hands and expense of attaching a large number of metal fittings, and has excellent functions not found in conventional products, and can be manufactured efficiently and at low cost.

The rubber used in the present invention may be either natural rubber or synthetic rubber, and is used in combination with a rubber agent including a vulcanizing agent. In particular, a rubber compound containing a reinforcing agent such as carbon black and having excellent strength, abrasion resistance, weather resistance, and blockage resistance is used.

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

An unvulcanized rubber string with a reinforcing fiber core is produced using an extruder to extrude compound rubber into a string of a desired shape, and at the same time extrude a reinforcing fiber core into the center of the string.

The fixing rope that is passed through the string holes of both grades 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.

Embodiment As shown in FIGS. 4a and 4b, a band-shaped diagonal mesh concave groove 12, a cord threading hole 4 on both sides, and a medium vulcanization mold core 1 are provided.
0, the upper and lower pairs of upper and lower vulcanizing molds 7 and 8, each having a communication groove 14 that communicates with the outer frame 9' of the middle vulcanizing mold 9', and the center of each string passing hole 4. Each medium vulcanization mold core bar 1 passing through
0 and a medium vulcanization mold outer frame 9' are integrated into a medium vulcanization mold 9, and furthermore, the string passage hole 4 is removed from the medium vulcanization mold 9 shown in FIGS. 3a and 3b. Diagonal mesh concave groove 12 in shape
Using a modified mesh support type 11 having the same shape as the above, the mesh groove width 'E-, 1 to 8 mm wide, and the depth of the mesh concave grooves being approximately twice as deep as the diagonal intersecting mesh concave Thk 13 minutes. Then, in the next step, a belt-shaped diagonal cross-mesh anti-slip rubber band for automobile tires is manufactured.

Wl process 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.The second step is to supply the ribbon-shaped compounded rubber and the nylon thread treated with resorcinol and formalin latex to an extruder to form an unvulcanized rubber string with a supplementary 1jII fiber core of a predetermined shape and size. Extrude.

Third Step As shown in FIGS. 3a and 3b, the vulcanizing mold 9 is placed surrounding the mesh preparation mold 11.

To this, an unvulcanized rubber string with a reinforcing fiber core is knitted in a mesh order number 2.
From 1, fit along the mesh @ Apply the core metal lO and repeat the reversing operation until number 61 to form a mesh rubber band. When the intersecting parts of this many meshes are simultaneously crimped with a crimping machine with claws that can perform EE bonding, and the medium vulcanization mold 9 is removed from the fine branch mold 11, reinforcing fibers formed in a diagonal cross-shaped mesh are formed. Core powder 1JO
The sulfur rubber is taken out while being prepared in the medium vulcanization mold 9.

This process and the next process are 11t of upper and lower vulcanization molds 7 and 8.
M], a preforming process is performed by holding at least fnM pieces of medium vulcanized gold 8!9. Able to work efficiently.

4th step The mesh concave groove 12 of the lower ++n sulfur mold 8 shown in FIGS. 4a and 4b and the communication groove 14 between the core metal and the outer frame are prepared for the middle vulcanization mold 9 in the third step. The unvulcanized rubber cord containing a reinforcing fiber core with a diagonal cross mesh is rearranged and fitted, and the upper vulcanization mold 7 is fitted thereon, and then pressurized and heated using a press force n company machine. and vulcanization molding.

After completion of the 5th vulcanization molding, remove the upper vulcanization mold for 7 minutes, then remove the middle vulcanization mold 9) and the outer vulcanization rubber band, then remove the lower vulcanization mold 8, and then When the digit molded rubber band is removed from the vulcanization mold 9, an automobile tire anti-slip rubber band 1, a part of which is shown in FIG. 1, is obtained. Figure 2 (This is a diagram showing the device installed on a tire) The present invention consists of a belt-like diagonal mesh, a concave groove in which a string hole can be formed on both edges, and a string iA. Upper and lower vulcanizing molds having communication grooves for accommodating the intermediate vulcanizing mold that integrates the core metal and the outer frame of the intermediate vulcanizing mold, and a hole for string passage. Using a vulcanization mold that had been heated by 8 people in a medium-sized JO sulfur mold for molding, an unvulcanized rubber cord with a reinforcing fiber core was preliminarily molded into a medium-sized JO sulfur mold using a mesh preparation mold. A band-shaped diagonal cross-shaped mesh is prepared in advance, and this is placed in the upper and lower vulcanization molds and vulcanization molded.The mesh rubber band thus formed has a mesh rubber that is not found in conventional products. It is characterized by the fact that both edges of the belt are molded with holes for threading strings along the length of the rubber band.

Is this a cool feature that conventional products don't have? Non-slip rubber bands for automobile tires can be manufactured efficiently and inexpensively. In other words, the present invention has the following advantages. In order to make things in advance of JJO Sulfur,
The time required to fill the upper and lower vulcanization molds is short, and the production capacity of the expensive vulcanization molds and press +10 curing machine is high, resulting in high vulcanization efficiency and efficient production at low cost.02) A core metal for the medium vulcanization mold that forms each string passage hole is provided for each string passage hole, and this structure is integrated with the medium vulcanization mold outer frame to create an accurate mesh groove. With the mesh preparation mold, it is possible to make preparations that perfectly match the mesh grooves of the lower vulcanization mold, and there are no defective products, and the vulcanization molding can be carried out efficiently. Since each of the rubber bands is short, it is easy to remove the vulcanized mesh rubber band from the middle vulcanization mold.

3) The anti-slip rubber band for automobile tires of the present invention has string holes on both edges that are not found in conventional products. Also, this metal fitting will not damage rubber cords, aluminum foil, etc. Before installing the tyre, tighten the fixed rope before attaching the front attachment through the string holes on both edges. For use, the mesh rubber band approximates the shape of the tire, that is, it is semi-circular in the width direction and circular in the length direction.The mesh rubber band is placed over the tire from the outside of the tire and fitted. After moving the car forward or backward to the 30-40 position, you can fix the leakage of the rubber band and tighten it by splicing a fixed rope and attaching it to the tire, so the tire can be jacked up. 4) The anti-slip rubber band for automobile tires of the present invention integrates a strong reinforcing fiber core and reinforced rubber with excellent wear resistance and strength into a mesh-like structure. Because it is molded, it has excellent durability.

In addition, because it has a diagonal cross mesh and has an elastic and flexible structure, there is no vibration and it is easy to drive.・It does not generate noise and does not destroy the road.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the main parts of a product according to a practical example of the present invention, FIG. It is a perspective view showing a medium vulcanization mold, a preparation mold, and a preparation order according to one embodiment, and No. 8b■ is this cross section M
FIG. 4a is a perspective view with a partially broken surface showing the structure of a lower vulcanization mold, a middle vulcanization mold, and a lower vulcanization mold used in an embodiment of the present invention. FIG. 4b shows this cross section 0 1...Vulcanized diagonal mesh rubber band 2...Vulcanized rubber 3...Reinforcing fiber core 490. String hole on edge 5... String hole on edge 66... Fixing lobe 7 for tightening, Upper vulcanization mold 8... Lower vulcanization mold
9... Medium vulcanization mold 9'... Outer frame of medium n0 sulfur mold
10... Core bar 11 of the middle vulcanization mold...@4-branch modified type 12... Diagonally crossing mesh concave grooves 13 of the bottom vulcanization mold...
・Mesh preparation type diagonal intersecting mesh concave grooves 14...Communication grooves 21-61 between core bar and outer frame...Mesh knitting order number of unvulcanized rubber with reinforcing fiber core

Claims (1)

[Scope of Claims] 1. A pair of upper and lower molding and vulcanizing molds having a belt-like diagonal cross-shaped mesh and concave grooves in which string passing holes are formed on both edges of the belt-like mesh. , a method for manufacturing an automobile tire anti-slip rubber band that is vulcanized and molded using a medium vulcanization mold that penetrates the center of the string hole to form a string hole, The core metal of each medium vulcanization mold to be formed is
The upper and lower vulcanizing molds have a structure that is integrated with the outer frame of the middle vulcanizing mold that surrounds the outer periphery of the upper and lower vulcanizing molds through the grooves provided between the upper and lower vulcanizing molds. A method for producing an anti-slip rubber band for an automobile tire, characterized by vulcanization molding using a lower vulcanization mold. 2. A medium vulcanization mold is placed around the outer periphery of the mesh preparation mold, which has concave grooves with oblique meshes in the shape of a belt, excluding the string passage holes, and an uncured mold with a reinforcing fiber core is placed in this mold. Insert the sulfur rubber string along the concave grooves of the mesh, hook it around the core of the medium vulcanization mold at both edges of the mesh, turn it around, and repeat the process of aligning it with the concave grooves of the mesh, and then knit the mesh one after another. , the mesh intersections are crimped to prepare the mesh, and the middle vulcanization mold with the mesh preparation of this unvulcanized rubber string is placed in the upper and lower vulcanization molds, and this is done.
2. A method for producing an anti-slip rubber band for an automobile tire according to claim 1, wherein the rubber band is vulcanized under pressure and heat.