Off-the-road tyre low-external-temperature vulcanization method

Abstract

The invention provides an off-the-road tyre low-external-temperature vulcanization method. According to the off-the-road tyre low-external-temperature vulcanization method, the tyre internal temperature vulcanization process remains unchanged, and the external temperature vulcanization process is adjusted, that is, low-pressure saturated steam at the pressure of 0.20 MPa-0.40 MPa and the temperature of 100 DEG C-110 DEG C is introduced into a vulcanization outer steam chamber; the vulcanized position of a tyre is transferred from the weakest vulcanized position to the center of the tyre through external temperature reduction, the pressure and temperature stability of internal and external mediums of the tyre are maintained until completion of vulcanization; and the tyre is taken out, and vulcanization is completed. The off-the-road tyre low-external-temperature vulcanization method has the advantages that the external pressure steam temperature is reduced in the tyre vulcanization process, steam is saved a lot, and energy consumption in the tyre vulcanization process is greatly reduced; the over-vulcanization degree of the tyre is reduced, the total vulcanization degree can be reduced by 20% or more, the overall vulcanization uniformity of the tyre is improved, the tyre quality is obviously improved, and the service life of the tyre is prolonged by 6%-12% compared with a tyre produced through a traditional isothermal and equipressure vulcanization process.

Description

technical field [0001] The invention relates to the field of tire manufacturing, in particular to a vulcanization method for engineering machinery tires. Background technique [0002] At present, the vulcanization process used in the manufacturing process of OTR tires mostly adopts isobaric isothermal vulcanization process, that is, a medium of a certain temperature and pressure (such as saturated steam) is introduced into the vulcanization bladder at the beginning of vulcanization for a certain period of time to pre-vulcanize the tire, and then Steam or superheated water is fed into the tire vulcanization outer steam chamber and bladder, and the temperature and pressure of the steam and superheated water are kept constant and continuously circulated during the tire vulcanization process. In this vulcanization process, the internal temperature vulcanization mainly depends on the circulation of superheated water for vulcanization, and the external temperature vulcanization re...

AI Technical Summary

Problems solved by technology

[0003] Due to the large cross-sectional size of off-road tires and long vulcanization time, the vulcanization process at this external temperature can easily lead to uneven vulcanization of the tire during the actual vulcanization process of the off-road tire, and the weakest position of the tire vulcanization is biased towards the inner side of the tire. Tires are vulcanized unevenly in this vulcanization process, and there is a phenomenon of high external temperature, and the tire rubber is over-cured to a large extent, and the physical properties of the vulcanized rubber are greatly reduced, which affects the quality of the tire; at the same time, due to the high external steam temperature, the Production costs, but also increased energy waste