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December 31,2018

Three factors to be paid attention to during vulcanization of belt vulcanizer

The first factor affecting the vulcanization process of the belt vulcanizer: vulcanization temperature


The vulcanization temperature determines the degree of vulcanization uniformity. Experience and tests have shown that when the temperature is 10 °C higher, the vulcanization time is shortened by about half, and the rubber is a poor thermal conductor. The vulcanization process of the product will vary depending on the temperature of the product. If the uniform vulcanization effect is achieved, the temperature control of thick rubber products is very critical, and the temperature should be gradually increased. The principle is low temperature vulcanization for a long time. Arphu conveyor belt vulcanizing machine heating plate not only has good power saving effect, but also has automatic temperature control system to effectively improve the vulcanization quality of the product.


The second factor affecting the vulcanization process of the belt vulcanizer: the amount of sulfur


The higher the amount of sulfur in the belt vulcanizer heating plate, the faster the vulcanization rate will be, and the higher the vulcanization procedure will be. However, the solubility in sulfur and rubber is limited, and the sulfur is used as much as possible. Sulfur will be precipitated from the surface of the rubber compound. This phenomenon is called “sulphur spraying”. To minimize the occurrence of sulfur injection, the method is to add an appropriate amount of sulfur at the lowest possible temperature. In general, sulfur is soft rubber. The dosage should not exceed 3%, the semi-hard rubber should not exceed 20%, and the pure hard rubber should be used at a higher level, up to 40%.



The third factor affecting the vulcanization process of the belt vulcanizer: vulcanization time


Vulcanization time is an important link in the vulcanization process. If it is too short or the vulcanization process is not enough, it is commonly called “under-sulfur: if it is too long, the vulcanization degree will be too high, commonly known as “persulfurization”, only the appropriate length of time can be achieved. The best vulcanization effect, commonly known as positive vulcanization.