A mixer is provided with a pair of specific shape and relative rotation of the rotor, adjustable temperature and pressure in the closed state of the ground clearance mastication of the polymer material and mixing machinery, mainly by the mixing chamber, the rotor composition rotor seal, feeding pressing device, unloading device, gearing and engine blocks and other parts. Mixer is developed on the basis of an 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 is displayed 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, reduce the loss of complexing agent, to improve product quality and working environment; safe and convenient operation, reduce labor intensity; conducive to achieve mechanical and automation operations. Thus, the emergence of the mixer is an important achievement and rubber machinery, is still mastication and mixing typical important equipment, continues the development and improvement.