A mixer is provided with a specific shape and relative rotation of the rotor, at an adjustable temperature and pressure of the sealed state of the polymer material to a gap of mastication and kneading machine, mainly by the mixing chamber, the rotor composed rotor seal, feeding pressing device, unloading device, gearing and engine blocks and other parts. Mixer is developed on the basis of open mill on a high-intensity intermittent mixing equipment. Since 1916 appeared in the true sense type mixer, the mixer's power is gradually being recognized, it shows up in the rubber mixing process than a series of open mill excellent features, such as: large mixing capacity Time is short, high production efficiency; better overcome dust flying, reduce the loss of complexing agent, to improve product quality and working conditions; safe and convenient operation, reduce labor intensity; conducive to achieve mechanical and automated operations. Therefore, the mixer is an important outcome of the emergence of rubber machinery, is still the mastication and mixing typical important equipment, development and improvement continues.