General thin wall or high quality requirements of products, the need to remove impurities in the plastic material, so as not to affect the air tightness of products and tear resistance. In the process of rubber filtering, sulfur and overspeed accelerant cannot be added to the rubber material to prevent burning when the temperature of the rubber material is too high.

The rubber material must be heated in an open mixer before filtration to increase thermoplasticity. The methods of heat refining and glue supply are the same as those of common extruders. Filter rubber parts temperature, barrel is 40 ~ 50 ℃. The nose is 60 ~ 90 ℃. Filter plate is 60 ~ 80 ℃. The filtered NR rubber temperature does not exceed 130 ℃. Mixed with 30% SBR rubber, also does not exceed 140 ℃.

The filtered compound can be cooled by pressing the tablets in the mill, and sulfur and accelerant can be added according to the technological requirements.