PVC UPVC pipe production line, used to produce all kinds of water supply, drainage, electrical threading pipe. The machine adopts high efficiency and energy saving conical twin screw extruder, and extrudes two PVC pipes through a special mold at one time, which effectively saves energy, improves production capacity and efficiency, and saves floor area and/or force cost. Designed for a two PVC pipe design dust-free cutting machine, the use of frequency independent speed regulation, can adjust the cutting speed according to the cutting needs, the use of Haff clamping device, so that the service life of the fixture product cutting surface flat, no burrs, to solve the problem of PVC chip dust pollution, the use of incremental encoder length cutting, to ensure the consistency of product length cutting. The double-tube inkjet mobile device specially developed for inkjet printers uses one nozzle to print double-tube characters, reducing the customer's asset investment in inkjet printers. Specially designed for PVC powder forced feeding device, the use of double screw forced feeding device, effectively prevent the powder in the feeding process bridge and lack of material phenomenon. The control system adopts the latest intelligent distributed scheme, which can be adjusted single-machine, synchronous linkage of the whole line, automatic fault alarm, easy operation, high degree of automation, stable and reliable production.