An internal mixer is a machine that is equipped with a pair of rotors with a specific shape and relatively rotating, and intermittently plasticizes and mixes polymer materials in a closed state with adjustable temperature and pressure. The following editor of Xianji.com will introduce the working principle, structure, purpose, operation method and precautions of the internal mixer in detail.

 

When the internal mixer is in the rubber mixing process, after raw rubber or other materials are added from the hopper, they first fall into the upper part of the two relatively rotating rotors, and are brought into the two rotors under the pressure of the top bolt and the action of friction. In the gap, it is subjected to kneading. Then the rubber material is divided into two parts by the protruding edge of the lower top bolt. As the rotor rotates, it passes through the gap between the rotor surface and the front wall of the mixing chamber. After being subjected to strong mechanical shearing and kneading, it reaches The upper part of the mixing chamber. Under the influence of the different speeds of the rotors, the two strands of rubber material converge on the upper part of the two rotors at different speeds, and then enter the gap between the two rotors. In the entire work of the internal mixer, when the raw rubber is masticated in the internal mixer, it is subjected to both strong mechanical stress and thermal oxidative cracking, so the required plasticity can be obtained in a short time.

 

Because the shearing effect of the rubber compound during mixing in the internal mixer is much greater than that of the open mixer, the mixing temperature is high, making the mixing efficiency of the internal mixer much higher than that of the open mixer.