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Tyre sulfuration process

A tire vulcanization and process technology, which is applied in the field of vulcanization technology, can solve the problems of reduced physical properties of rubber materials, impact on tire quality, and long curing time, etc., to improve tire quality, improve equipment utilization, and save steam or superheated water Effect

Inactive Publication Date: 2004-08-25
GUILIN RUBBER MACHINERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, only a small part of the heat of the circulating steam or superheated water is absorbed by the tire, and a large amount of steam or superheated water is discharged ineffectively
Moreover, the current vulcanization process is prone to over-vulcanization due to the long curing time.
Oversulfurization greatly reduces the physical properties of the rubber compound and affects the quality of the tire
[0003] In short, the current isobaric and isothermal vulcanization process has high energy consumption, high production cost, and unguaranteed quality, which are important reasons for the lack of competitiveness of the entire tire industry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] For 63.5″ tires, high-temperature steam at about 220°C is introduced for about 2 minutes during the vulcanization induction period. Then, in the pre-vulcanization stage, steam is released, and when the temperature drops below 160°C, superheated steam at about 220°C is intermittently introduced. Water circulates in the capsule to make the temperature inside the capsule fluctuate within 10°C above and below the set temperature of 170°C, and keep the pressure for about 5 minutes. During the normal vulcanization stage, when the pressure is kept constant, no steam or overheating Water, keep the pressure for about 44 minutes. The temperature drops from 170°C to about 120°C. The pressure drop ratio at this stage is less than 1.5%, which can be regarded as the pressure remains basically unchanged. The entire vulcanization process takes about 51 minutes, compared with isothermal etc. The 55 minutes required for the entire vulcanization process, the vulcanization process of this p...

Embodiment 2

[0017] For 45″ tires, during the vulcanization induction period, high-temperature steam at about 200°C is introduced for 2 minutes, and then, in the pre-vulcanization stage, superheated water at about 200°C is intermittently introduced to circulate in the bladder to maintain the temperature inside the bladder at 160°C. ±10°C for about 5 minutes. During the normal vulcanization stage, no high-temperature steam or superheated water is introduced, and the pressure is kept for about 7 minutes. During this process, the temperature drops from 160°C to about 110°C, and the pressure drop rate is very small , it can be considered that the pressure remains basically unchanged. The entire vulcanization process takes about 14 minutes, compared with the 16 minutes required for the entire vulcanization process of isothermal and isobaric pressure, the vulcanization process of this process saves about 2 minutes. The quality of the tire is significantly improved, and no It was found that the sc...

Embodiment 3

[0019] For 55″ tires, high-temperature steam at about 210°C is introduced for 2 minutes during the vulcanization induction period, and then, during the pre-vulcanization stage, high-temperature steam at about 210°C is intermittently introduced to circulate in the bladder, and the temperature is maintained at 170±10°C. It lasts for about 6 minutes. During the positive vulcanization stage, no high-temperature steam or superheated water is introduced, and the pressure is kept for about 34 minutes. During this process, the temperature drops from 170°C to about 110°C, and the pressure drop rate is very small, which can be regarded as The pressure remains basically unchanged. The entire vulcanization process takes about 40 minutes, compared with the 43 minutes required for the entire isothermal and isobaric vulcanization process, this process saves about 3 minutes in the vulcanization process. The quality of the tire is significantly improved, and no over-vulcanization stage has been ...

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Abstract

The present invention relates to a tyre vulcanization process. Said process includes the following steps: introducing high-temp. medium with 180-220 deg.C which is 15-25% higher than general conventional vulcanization temp. into capsule to heat tyre and accelerate cross-linking reaction; intermittently introducing high-temp. medium, its temp. can be up-down floated in the range of 150-170 deg.C to implement prevulcanization stage; making optimum cure stage, stopping the high-temp. medium from introducing into capsule, retaining pressure, in the course of vulcanization the temp. is lowered by 20%-35% so as to implement isopiestic temp. swing vulcanization. It can shorten vulcanization time by 7-13%, and can obviously raise tyve quality.

Description

(1) Technical field [0001] The invention relates to a vulcanization process, in particular to a tire vulcanization process. (2) Technical background [0002] At present, most of the vulcanization processes in the tire manufacturing process adopt the traditional isothermal tire vulcanization process that has been used since the 1960s. A medium of a certain temperature and pressure (such as steam or superheated water mixed with steam) is passed into the bladder of the vulcanized tire for a certain period of time. Hot water, during the whole normal vulcanization process, steam or superheated water maintains a certain pressure and temperature and circulates continuously, that is, the constant pressure and temperature are always maintained during the normal vulcanization process. This process consumes a lot of energy, and the tire vulcanization process is the largest energy-consuming process in tire production. In fact, only a small part of the heat of the circulating steam or ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C35/04
Inventor 方常耀张忠明姚华娟江永福陈原佳
Owner GUILIN RUBBER MACHINERY CO LTD
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