... ,PPR,PE,PVDF pipe fitting injection machine 2.with CE PVC ,PPR,PE,PVDF pipe fitting injection machine with CE 1. PVC raw material ... causticity gas. 2. Special design PVC screw for Injection molding machine to produce PVC pipe fitting, smaller compress ratio to suitable ... for compress length as to decrease shear heat, screw design with double spiral groove divide into not plasticizing PVC raw material ...