The production line is mainly used to produce plastic pipe whose raw material is mainly PP-R resin, and also suitable for PP, PPB, PPC, PE resin. 1. Main machine interface operation, high automation. 2. Adopts special screw and have good plasticizing result. 3. Adopts composite die head, and can effectively clear material memory. 4. Vacuum calibration, constant temperature control, no stress for pipes. 5. Adopts co-extrusion die head and adds marking line for pipes.