... 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 barrelDiameterΦ25/53,35/77,45/90,51/10 ... ;4)cobalt base alloy5)stainless steel 6)Gh113 nickel based alloy Nitride ... on the plastic raw materials)Bimetallic: much longer lifetime.Nitriding ...