PP,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 ... methods for the screw of different functions.Materials38CrMoAlA (JIS SACM645)SKD61 .etcApplication PS,HIPS,ABS,SAN,EPN/LDPE,HDPE,UHMPE,EVA,PP,PVC ...