Plastic Plate MachineryChina Jwell-Nitrided Spray Bimetallic Coating 38crmoala Alloy-Steel PE PP HDPE LDPE Extruder Screw Barrel for Blow Film & Cast Film, Sheet Plate Pipe Extrusion, Find details about China Screw Barrel, Conical Twin Screw from Jwell-Nitrided Spray Bimetallic Coating 38crmoala Alloy-Steel PE PP HDPE LDPE Extruder Screw Barrel for Blow Film & Cast Film, Sheet Plate Pipe Extrusion