... machine 2.with CE PVC ,PPR,PE,PVDF pipe fitting injection machine with CE1. PVC raw material is Amorphism High Polymer , ... length as to decrease shear heat, screw design with double spiral groove divide into not plasticizing PVC raw ... designing as to improve mixed effect. Screw surface with special hard chrome plating to prevent causticity gas.It ... PVC ,PPR,PE,PVDF pipe fitting injection machine with CE