Screw for extruder and method of manufacturing the extruderer, and rubber member for tire and method of manufacturing the rubber member

摘要

A screw 12 for an extruder 10 rotatably supported on the cylinder of the extruder and carrying roll-heated rubber material supplied from a hopper port 13 s provided at the rear part of the cylinder 11, wherein the height of the portion of the flight portion 12 z of the screw 12 located below the hopper port 13 s is set lower than the height of the flight portion 12 a on the downstream side of the screw 12, whereby the pulsation of extruded matter can be reduced while maintaining a high discharge rate.