China's PVC pipe development faster, the annual growth rate of 8%, while the annual demand growth rate of 2%. In the plastic pipe, PVC pipe dosage has been far ahead, it is widely used in water supply and drainage pipes. Due to the relative maturity of the technology, PVC water supply pipe material in the product innovation is not much investment, new products are relatively not much, the market is more ordinary products, high technology, high value-added products less, similar general products, low-end products account for most of the high-grade products less.
Currently, the domestic production capacity of plastic pipes amounted to 3 million tons, mainly PVC, PE and PP-R pipeline three categories, of which PVC pipe is the largest market share of plastic pipes, accounting for nearly 70% of the share of plastic pipes. 1600 PVC pipe production line. Annual production capacity of more than 2.5 million tons, in 2003 the annual output of PVC pipes (fittings) reached more than 1.2 million tons. In the plastic pipe, PVC share of 70%, PE accounted for 25%, PP-R accounted for 4%, others accounted for 1%.
PVC pipe production line process
Production process raw materials + additives preparation → mixing → conveyor feeding → forced feeding → conical twin-screw extruder → extrusion molds → sizing set → spray vacuum shaping box → immersion cooling water tank → ink printing machine → crawler haul-off machine → lifting knife cutter → pipe stacking racks → finished product testing and packaging