... price 5.APP:PE,PP,PVC,PET,etc. The screw diameter Φ62.4 mm, L/D=40 1, ... bricks principle. The material of screw core axle is 40 CrNiMoA, the material of screw element adopted high speed tool ... , with high temperature vacuum quenching heat treatment. The screw element and core axle is connected by involute structure with ... .9300~550D60016012008.5500~850 SHJ series co-rotating twin screw extruder