Screw Barrel, Plastic Extruder, Plastic Pipe Extrusion Line manufacturer / supplier in China, offering PVC PE PP Pet HDPE LLDPE WPC Bimetallic Screws and Cylinders, High-Efficient HDPE Pipe Screw Barrel with L/D 33: 1&38: 1, Screws for Batch Dosing Syetem and so on.