Common cold feed extruder for the sidewall of the tire, the tread shape extruder, rubber hose and wire, cable extrusion plastic bags, rubber shoes with film and all kinds of cross section rubber extrusion, calender thermal refining, for glue, etc. Cold feed rubber extruder have widely used in rubber industry in China. In the radial tire production, tread extrusion, compound tread extrusion, plastic Angle and all kinds of rubber type three-phase corresponding screw parts has a circular groove. Nail directly insert the pin in the circular groove, rubber in the role of the pin low lateral movement, movement and rotation motion. Due to these three movement forms of combination, can effectively destroy the rubber extrusion process of formation of the core. Whenever the core through the pin % E