... PP,PE,PVC,PET,ABS,PPR for Plastic Extruder Machine Conical Twin Screw and Barrel ... 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 ... ridge,and uses different alloy and welding methods for the screw of different functions.Materials38CrMoAlA (JIS ...