1. The combination of vulcanization and foaming
The vulcanization speed should match the foaming speed. One cannot be substantially faster than the other.
The vulcanization speed is too fast: the foaming agent cannot be successfully decomposed to foam the rubber due to the strong mechanical force of the vulcanized rubber.
The vulcanization speed is too slow: the foaming agent decomposes the gas when the rubber is completely or nearly completely unvulcanized to foam the rubber, but at the same time, the surface of the rubber is also broken by the gas, so that the surface of the rubber tube is uneven or has pores.
Comparison of the two speeds: Generally, the vulcanization speed needs to be slightly faster than the foaming speed, which ensures the smooth surface of the hose, and the second allows the foaming agent to smoothly decompose the gas to foam the rubber.
2. The foaming process of the hose
Microwave: The foaming of the hose is mainly completed by microwave heating. The rubber tube is heated from the inside to the outside by microwave heat radiation. When the inside of the rubber tube starts to be heated and foamed, the relative temperature of the rubber material outside the rubber tube is still relatively low, so that the rubber tube cannot be fully vulcanized. In this way, the heating method from the inside to the outside ensures that the hose can be foamed smoothly.
When the microwave heats and foams the hose, it is also accompanied by vulcanization, but the vulcanization at this time does not reach the final vulcanization depth. After coming out of the microwave, it enters the hot air heating section to complete the final vulcanization of the hose. To complete the vulcanization and foaming of the hose.
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