China's PVC pipe has developed rapidly in recent years, with an annual growth rate of 8% and an annual demand growth rate of 2%. Among plastic pipes, the amount of PVC pipe has been far ahead, and it is widely used in water supply and drainage pipes. Due to the relatively mature technology, PVC water supply pipes have not invested much in product innovation in recent years. There are relatively few new products. There are many common products on the market, few high-tech and high-value-added products, and similar general-purpose products and medium- and low-end products account for the majority. In part, there are fewer high-end products.
At present, the domestic plastic pipe production capacity reaches 3 million tons, mainly including PVC, PE and PP-R pipes. Among them, PVC pipe is the largest plastic pipe with market share, accounting for nearly 70% of the plastic pipe. More than 1,600 PVC pipe production lines. The annual production capacity is over 2.5 million tons. In 2003, the annual output of PVC pipes (pipe fittings) reached more than 1.2 million tons. In plastic pipes, the share of PVC is 70%, PE is 25%, PP-R is 4%, and the others are 1%.
PVC pipe production line process
Production process raw materials + additive preparation → mixing → conveying feeding → forced feeding → cone twin-screw extruder → extrusion die → sizing sleeve → spray vacuum setting box → soaking cooling water tank → ink printer → crawler traction Machine → lifting knife cutting machine → pipe stacking rack → finished product inspection packaging.
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