This product line is protected by two patents, it can produce HDPE-AL and PPR-AL composite pipe. It adopts technique of once forming co-extruding butt argon arc welded/ultrasonic lap welded aluminum plastic composite pipe. Aluminum tube adopts Argon Arc welding, so the strength of the welding seam is greater than the mother material. The plastics and thermoplastic cement are co-extruded into the die mouth. The shaping, welding of aluminum pipes, extruding of inner and outer plastic pipes and bonding with aluminum pipes of inner and outer plastic pipes are finished at the same time. So the inner & outer plastics are adhered firmly with aluminum pipes and the speed of production increase greatly.  Features:  * Aluminum tube adopt Argon Arc welding/ultrasonic welding. The plastics and thermoplastic cement are co-extruded into the die mouth. The shaping, welding of aluminum pipes and the extruding & adhesion of inner and outer plastic pipes are finished at the same time.  * The inner & outer plastics are adhered firmly with aluminum pipes. The strength of the seam welding machinery is greater than the mother material.  * Calibrating set is made from hard metals and there is a layer of nano-diamond on its surface. So it has characteristics of long life and lower friction factor between aluminum and it.  * The production line is 35m in length and covers a smaller area.  * The small installed capacity reduces the power consumption.  * Its operation is stable with a low scrap rate and a low idleness rate.