Appearing on the market, there are three plastic composite pipe: 1, PE / AL / PE (outer layer of polyethylene); 2, PE / AL / PEX (crosslinked polyethylene inner layer, outer layer of polyethylene); 3 , PEX / AL / PEX (crosslinked polyethylene inner and outer layers are the central layer are aluminum layer).

• Two kind welding process:
• 1. ultrasonic lap seam welding, co-extrusion forming.
• 2. butt-joint argon-arc welding, welding seam close-gained and smooth.
• Controlling center adopting computer control system of Austria B&R company programmable computer.
• Long-distance closed loop control automatically the process of the speed of extruding and hauling, temperature and product diameter.