As one of the products of technological development, PVC pipes are within reach of everyday life. In Europe, the growth rate of plastic pipes was 8% from 1980 to 1990, and the output in 2001 was 3.5 million tons, of which PVC pipes accounted for 60%. In 1985, the output of plastic pipes in the United States was 1.6 million tons. In 1999, the output was about 3.6 million tons, of which PVC pipes accounted for 78%. China's first UPVV flared pipe was born in Shenyang Plastics Factory in 1983. Since then, China has the production capacity of PVC pipes and drain pipes. The late 1990s was a period of rapid development of PVC pipelines in mainland China. During the period, some factories with an annual production capacity of more than 50,000 tons were completed and put into operation, and more than 30 PVC pipeline factories with a production capacity of more than 10,000 tons were built. The annual production capacity of plastic pipes is 2 million tons.