Extrusion Line, Plastic Machinery, Single Screw Extruder manufacturer / supplier in China, offering 3-Layer PE Coated Steel Pipe Extrusion Making Line for Oil and Gas Transmission Pipelines, 3 Layer Polyethylene (3LPE) Pipe Coating Line for Steel Pipe Anti-Corrosion Pipeline, 3 Layer Polyethylene (3LPE) Anti-Corrosion Coating Line for Long-Distance Pipeline Protection and so on.