1. Roller wrapping
During mixing, there are four possible situations for raw rubber on the roller of the mixing mill
The situation occurs when the roller temperature is too low or the rubber is hard, the rubber stays at the accumulated rubber and slides, and cannot enter the roller gap, or can only become fragments when forced into.
The situation occurs when the rubber is in a highly elastic state, with both plastic flow and appropriate highly elastic deformation. After the rubber passes through the roller gap, it is only wrapped on the front roller, which is conducive to mixing operations and the dispersion of compounding agents in the rubber.
The third situation occurs when the temperature is too high, the fluidity of the rubber increases, the intermolecular force decreases, and the elasticity and strength decrease. At this time, the rubber sheet cannot tightly wrap the roller and become a bag-like shape, and the roller or rupture occurs, and the mixing operation cannot be carried out.
The fourth situation occurs when the temperature is higher, the rubber changes from a highly elastic state to a viscous flow state, the elasticity and strength almost disappear, and the rubber is difficult to cut. Therefore, the mixing temperature should be controlled to keep the rubber in a state that is conducive to mixing.
2. Powder eating
The powder eating stage refers to the process of mixing compounding agents into the rubber. After the rubber is wrapped around the roller, in order to mix the compounding agent into the rubber as quickly as possible, a certain amount of accumulated rubber should be retained at the upper end of the roller gap.
When the compounding agent is added, the compounding agent is brought into the wrinkles of the accumulated rubber due to the continuous flipping and replacement of the accumulated rubber, and then into the roller gap.
In the process of eating powder, the amount of accumulated rubber must be moderate. When there is no accumulated rubber or the amount of accumulated rubber is too litt