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