KR100203448B1 - Pneumatic tyre vercanization method - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vulcanization method of a pneumatic tire, wherein a mold bundle comprising upper and lower molds 8 and 9, upper and lower heating plates 10 and 11 and heat dissipation lids 12 disposed on the outside thereof is provided with a raw tire ( 3) and the compounding rubber vulcanization bladder 1 to be attached to the inside of the raw tire 3, in the conventional vulcanization, so that the tire and the bladder are easily separated after the vulcanization of the tire is finished. Although all the green cases are painted inside, the present invention uses the silicone compound rubber so that the upper and lower clamping rings 4 and 5 clamping the compounding rubber vulcanization bladder 1 are overlaid on the outer surface of the bladder 1. By installing and vulcanizing the tube (2), it is easy to separate the tire and bladder after finishing the tire vulcanization even if the inside of the green case is not painted, and a silicone compounded rubber tube from the green case (raw tire) to the vulcanizing bladder This prevents sulfur from penetrating the furnace and extends the life of the bladder.

Description

Vulcanization Method of Pneumatic Tires

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vulcanization method for a pneumatic vehicle tire, and more particularly, to the separation of the vulcanization bladder and the tire at the end of tire vulcanization under tire vulcanization conditions by covering a silicone rubber tube on the exterior of the tire vulcanization bladder. By facilitating the use of the green case inside paint used for separation between conventional vulcanization bladder and tires, it improves the durability of the vulcanization bladder and makes it easy to replace only damaged parts of the bladder. It is to provide a method of vulcanization of pneumatic tires that can be saved.

In manufacturing tires, compound rubbers containing rubber, carbon black, sulfur and other rubber chemicals are extruded and toppings are applied to cords, bead wires, and various semi-finished products such as carcass, belts and beads. The raw material is manufactured, the manufactured semi-finished products are combined, and the molding process is used to make a green tire called a green case.The raw tire is put into a mold and heated and pressurized for a certain time to complete the tire. Is called a vulcanizer.

In the vulcanizer, the green case is pressed against the mold inner wall by applying pressure to the mold side in the green case to form a tire according to the shape of the mold inner wall. At this time, the pressurized medium prevents leakage and the pressurized medium directly contacts the green case. Bladder is used to avoid this.

Bladders are generally made using isobutylene isoprene rubber, called butyl rubber, or polymers that halogenate the ends. And it is well known that the higher the pressure of the pressurized medium, the higher the rubber density in the finished tire, thereby improving the durability of the tire. In the past, steam, hot water or steam and hot water were used together as an internal pressurizing medium of the bladder, but recently, in the early stage of vulcanization, steam is introduced for a predetermined time for heat supply, and thereafter, it is inert to further increase and maintain the pressure. A gas, generally nitrogen gas, is used. The pressure is so high that the tire and the bladder are tightly adhered to each other so that the tire and the bladder are not easily separated after the tire is completely vulcanized. Therefore, conventionally, the green case is painted inside each green case before vulcanization to facilitate separation from the bladder, which is referred to as green case inside paint (GIP).

GIP consists of water, silicone oil, mica powder, stone powder and some sediment stabilizer and antifoaming agent. Among them, silicone oil contributes to the separation of vulcanization bladder and tire at the end of tire vulcanization. And mica powder.

The composition of the rubber compound for tire vulcanizing bladder is generally 3 to 5 parts by weight of chloroprene rubber, 40 to 70 parts by weight of carbon black, 2 to 10 parts by weight of process oil, and 3 to 5 parts of zinc oxide based on 100 parts by weight of isobutylene isoprene rubber. By weight, and 5 to 10 parts by weight of the phenolic resin. The bladder made of such a compounded rubber contains a large amount of phenolic resin and thus has good adhesiveness, which prevents the tire from being separated from the bladder.

On the other hand, when manufacturing a vulcanization bladder with silicone rubber, it has excellent heat resistance and releasability, so even if the GIP is not applied to the inside of the green case, the bladder and tire do not adhere to each other. Since the sulfur contained in the) does not penetrate the bladder, there is no occurrence of CRACK, which is caused by the breakdown of rubber bonds on the bladder surface over long periods of use, such as in bladders using gilded rubber. The composition of the silicone compounding rubber is 30 to 50 aerosols, 2, 4-DICHOROBENZOYLPEROXIDE 1 to 5 parts by weight of fumed silica in 100 parts by weight of polysiloxane. However, silicone compounded rubber has good safety and release property, but is expensive, and generally has lower disadvantages in tensile and tear physical properties than rubber compounded rubber.

In the present invention, in the manufacture of a tire by putting the raw tire into a mold and vulcanized for a predetermined time by applying heat and pressure through the bladder, the tube of the silicone compound rubber on the surface of the bladder used in such a vulcanization process is vulcanized This makes it possible to eliminate the shortcomings of the bladder compounded rubber, which is sticky and prevents the tire from being separated from the bladder.It also has good safety and releasability but is expensive, and generally has a higher tension than the compounded rubber. And to cover the tube of the silicone compounding rubber having a disadvantage of low tearing property, etc. only on the surface of the bladder to greatly alleviate the defects of the bladder of the silicone compounding rubber.

In other words, the present invention, without taking the GIP by applying a silicone compounding rubber tube on the conventional compounding rubber vulcanization bladder in order to take only the good properties required by the vulcanization bladder out of the heterogeneous properties of the compounding rubber and silicone compounding rubber By allowing the bladder to be easily separated from the tire, the silicone compounded rubber tube prevents the surface cracks of the bladder so that the life of the vulcanized bladder can be extended.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a sectional view of an essential part of a vulcanizing device for implementing the vulcanizing method of the present invention.

* Explanation of symbols for main parts of the drawings

1: Butcher compounding rubber vulcanization bladder 2: Silicone compounding rubber tube

3: tire 4: upper clamp ring

5: lower clamp ring 6: upper bead ring

7: lower bead ring 8: upper mold

9: lower mold 10: upper hot plate

11: lower heat plate 12: heat dissipation cover

In the present invention, the raw tire 3 is provided on a mold bundle including the upper and lower molds 8 and 9, upper and lower heat plates 10 and 11 and the heat dissipation cover 12 provided on the outside thereof. In the installation and vulcanization of the compounding rubber vulcanization bladder 1 to be applied to the inside, the outer surface of the bladder 1 is covered with upper and lower clamping rings 4 and 5 for clamping the compounding rubber vulcanizing bladder 1. It is characterized by installing and vulcanizing the silicone compound rubber tube (2).

The silicone compounding rubber tubing is extruded in the same manner as when manufacturing a tube for automobiles and cut to a predetermined length, and then vulcanized at 200 ° C for 1 hour, or in a 170 ° C press to improve the surface. After vulcanization for 10 minutes, it can manufacture by vulcanizing for 50 minutes in 200 degreeC oven.

The vulcanization bladder mounting according to the present invention covers a vulcanized silicone compounding rubber tube 2 having a narrower inner diameter than the outer diameter of the compounding compound vulcanizing bladder 1 to be pasted on the conventional spraying compound vulcanizing bladder 1. Completed by inserting between the bead rings (6, 7) and clamp rings (4, 5) of the vulcanizer and simmering, the vulcanized compound rubber vulcanization bladder and the vulcanized silicone compound rubber tube are not attached to each other even if they are not bonded to each other. It can be firmly mounted so as not to be separated from each other by the bead ring and the clamp ring.

Therefore, even when the tire 3 is terminated, the double rubber layer is prevented from being separated by the bead ring and the clamping ring, and the silicone compounded rubber tube is added because the diameter of the silicone compounded rubber tube is smaller than the diameter of the compounded rubber vulcanization bladder. It is attached to the compounding rubber vulcanizing bladder and only the tire is released from them.

Therefore, according to the vulcanization method of the present invention, the tire and the bladder can be easily separated after the tire vulcanization without the use of the GIP, so that the use of the GIP becomes unnecessary, so that the process can be shortened. Prevents sulfur from penetrating into the vulcanization bladder to extend the life of the bladder, and replace only the damaged part of the silicone compound rubber tube or the butyl compound rubber vulcanization bladder and reuse the undamaged part. This saves resources.

Claims (3)

The green tire 3 is installed in the mold bundle formed of the upper and lower molds 8 and 9, the upper and lower heat plates 10 and 11 and the heat dissipation cover 12 provided outside thereof, and the inner tire 3 is attached to the inside of the green tire 3. In installing and vulcanizing the compounding rubber vulcanization bladder 1, the silicone compounding rubber tube is placed on the outer surface of the bladder by upper and lower clamping rings 4 and 5 for clamping the compounding rubber vulcanizing bladder 1 ( 2) Pneumatic tire vulcanization method characterized in that the installation and vulcanization. 2. The method for vulcanizing a pneumatic tire according to claim 1, wherein the silicone compounded rubber tube (2) is extruded from a silicone compounded rubber, cut into a predetermined length, and then vulcanized at a 200 ° C oven for 1 hour. 2. The silicone compounding rubber tube (2) is manufactured by extruding the silicone compounding rubber and cutting it to a predetermined length, followed by vulcanization in a 170 ° C. press for 10 minutes, and then vulcanization in a 200 ° C. oven for 50 minutes. Pneumatic tire vulcanization method characterized in that.

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