Extrusion Line, Plastic Machinery, Single Screw Extruder manufacturer / supplier in China, offering 20-Year HDPE Plastic Pre-Insulated Polyurethane Pre-Insulated Thermal Pipe Extrusion Line, Pre-Insulated Steel Jacket Polyurethane Insulation Casting Pipe Production Machine, O-Type Round Extrusion Coating Machine for 3lpe, 2lpe, and Fbe Steel Pipes and so on.