What is the mixing process of an open rubber mixer?

The mixing process of the open rubber mixing machine mainly includes three stages:

 ① Heating the raw rubber. The plasticized raw rubber is re-refined on the machine, heated and softened, and other polymers are added for blending. 

② Adding compounding agents. Generally, softeners, hard acid, etc. are added first, and then powder black, etc. are added (carbon black can also be pre-mixed with part of the raw rubber to form a master rubber). Sulfur is generally added at the end of the refining day, or after the rubber material has been parked, during the second refining.

③ Mixing and unloading. When all the compounding agents are added, they should be re-refined to make the mixture uniform, and then the rubber sheet should be unloaded.