Process for changing outer temperature of tire when vulcanizing tire

A tire and process technology, applied in the field of tire external temperature variable temperature vulcanization process, can solve problems such as the decline of the physical properties of the rubber compound, affecting the tire quality, etc., and achieve the effect of improving tire quality, reducing steam temperature and use time, and reducing energy consumption.

Inactive Publication Date: 2009-05-27
HAOHUA SOUTH CHINAGUILIN RUBBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Oversulfurization will greatly reduce the physical properti

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] For 30.00R51 radial tires with an outer diameter of 2904mm, a rim width of 22 inches, a section width of 823mm, and a maximum carcass thickness of 150mm, superheated water at 165°C and 3.2Mpa is introduced into the bladder during the vulcanization induction period and pre-vulcanization period, and the external temperature The temperature of steam is 100-120°C. During the normal vulcanization period, superheated water at a temperature of 165°C and a pressure of 3.2Mpa is continuously fed into the bladder to maintain a constant temperature and pressure inside the bladder, and the temperature of the steam outside the tire is controlled into two different temperature stages. According to the measured temperature outside the steam chamber, the pressure of the steam sent into the steam chamber is adjusted, that is, the amount of steam sent into the steam chamber is adjusted, thereby adjusting the temperature of the steam chamber.

[0012] (1) The temperature of the external t...

Embodiment 2

[0016] For a 40R57 radial tire with an outer diameter of 3594 mm, a rim width of 29 inches, a section width of 1097 mm, and a maximum carcass thickness of 220 mm, the vulcanization process during the vulcanization induction period and pre-vulcanization period is the same as in Example 1. During the positive vulcanization period, superheated water at 160°C and 3Mpa pressure is continuously fed into the bladder to maintain a constant temperature and pressure inside the bladder, and the steam temperature outside the tire is controlled to different temperatures in three stages.

[0017] (1) The temperature of the external temperature steam is 140°C and maintained for 260 minutes;

[0018] (2) The external temperature steam drops to 136°C within 2 minutes;

[0019] (3) Keep the external temperature steam at 136°C for 200 minutes and continue vulcanization;

[0020] (4) The external temperature steam drops to 132°C within 1 minute;

[0021] (5) Keep the external temperature steam ...

Embodiment 3

[0023] For a 53 / 80R63 radial tire with a diameter of 3780 mm, a rim width of 36 inches, a section width of 1346 mm, and a maximum carcass thickness of 270 mm, the vulcanization process during the vulcanization induction period and pre-vulcanization period is the same as in Example 1. During the positive vulcanization period, superheated water at 165°C and 3.5Mpa pressure is continuously fed into the bladder to maintain a constant temperature and pressure inside the bladder, and the steam temperature outside the tire is controlled to different temperatures in three stages.

[0024] (1) The temperature of the external temperature steam is 138°C and maintained for 300 minutes;

[0025] (2) The external temperature steam drops to 135°C within 2 minutes;

[0026] (3) Keep the external temperature steam at 135°C for 160 minutes and continue vulcanization;

[0027] (4) The external temperature steam drops to 132°C within 2 minutes;

[0028] (5) Keep the external temperature steam a...

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Abstract

The invention relates to a tire altering outer temperature vulcanization technique. Vulcanization is carried out in a capsule according to conventional technique in optimum cure period; the steam temperature outside a tire is controlled in two or three different temperature periods: the initial outer temperature is higher, namely, 138-150 DEG C, and is kept within 120-500 minutes; or the initial outer temperature is 138-143 DEG C and is kept within 120-300 minutes; the temperature gradually falls in the later period to 125-137 DEG C and is kept within 60-360 minutes; or the temperature falls to 132-137 DEG C and is kept within 120-240 minutes; if the temperature difference in each period is 2-10 DEG C, the altering temperature time is 1-10 minutes; if the temperature difference in each period is 3-5 DEG C, the altering temperature time is 1-3 minutes. The temperature of optimum cure in initial period is higher, so that the temperature outside the tire is increased faster, and the vulcanizing time is shortened. The deep part of the tire is affected slightly after the temperature is decreased, and can be vulcanized continuously. The technique ensures full internal tire vulcanization, avoids or reduces over vulcanization outside the tire, therefore, the technology is applicable to large-tire vulcanization, ensures the quality of the tire, decreases the steam temperature of outer temperature, shortens the use time and reduces energy consumption.

Description

(1) Technical field [0001] The invention relates to a tire vulcanization process, in particular to a tire external temperature variable temperature vulcanization process. (2) Background technology [0002] At present, the vulcanization process of tires is mostly an isothermal vulcanization process with internal temperature and external temperature. The control of its internal temperature is to pass a certain temperature and pressure medium into the capsule during the vulcanization induction period and the pre-vulcanization period for a period of time; Constant temperature and pressure. Simultaneously for controlling external temperature, the external pressure temperature steam outside tire keeps constant temperature. The green tire is installed in the mold and then placed in a steam room for vulcanization. [0003] Generally, the positive curing temperature of tires is above 145°C, and the positive curing temperature of some car tires is as high as 200°C, but the positive...

Claims

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Application Information

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IPC IPC(8): B29C35/04B29L30/00
Inventor 周胜何桂德许光明
Owner HAOHUA SOUTH CHINAGUILIN RUBBER
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