... PE,PVC,PET,ABS,PPR for Plastic Extruder Machine Conical Twin Screw and Barrel material: bimetallic layer PP,PE,PVC,PET ... ,ABS,PPR for Plastic Extruder Machine Conical Twin Screw and Barrel Zhejiang Bohai Conical twin screw barrelDiameter ... Standard SpecificationsISO9001Advantages1.Long time Nitriding Technology 2.Anti-corrosion and Wear-resisting Duplex Metal Spraying Technoloy3. we uses special ...