Mixing is one of the most important components in the rubber processing process. Mixing can be performed by separate mixers and mixers. The mixer mixing is also divided into high temperature and low temperature. Different equipment, formulas, vulcanization processes and production environments should have different mixing processes. There are different advantages and disadvantages of open mixing and dense mixing. Open mixing has some bad factors such as pollution, uneven dispersion, and more difficult to disperse high-melting point materials. It is relatively low temperature mixing, so open mixing After the mixing process, it needs to be parked to further spread the compounding agent. In general, it is necessary. At the same time, it can use the characteristics of low temperature mixing to add small medicines including speeding accelerators to the mixing at the same time. The compounded rubber sometimes has a more stable T90 vulcanizate than that of the internal mixer. Many compounding agents must be above their melting point in order to fully disperse and evenly disperse. For example, the commonly used auxiliary agent "Guomalong" has varieties with different melting points, so only low melting point grades can be selected in the formulation of the refining process.