bimetallic conical twin screw barrel for WPC profile production 1.Material:special alloy steel 2.Good ... customer service bimetallic conical twin screw barrel for WPC profile production specification:35/76, 45/90, 45/100, ... high frequency quenchingGHII3nature hard after high temperatureFor Plastic profile (WPC) ExtrusionTechniccal parameter modelmotor powerscrew dia.(MM)screw rotation speed( ...