Double-walled bellows is a new kind of pipe with annular structure and smooth inner wall, which was first developed in Germany in the early 80. HDPE double wall corrugated pipe with large diameter and high strength, as a result of the use of U-shaped steel belt composite PE material, so that the pipe can increase the cost of the premise of a substantial increase in the ring stiffness, than the winding pipe, carat tube strength under the same weight in the case of large, increase in amplitude, the perfect solution to a series of problems such as overloading, After more than 10 years of development and improvement, has been developed from a single species to complete the product line.
At present, in the production process and the use of technology has been very mature. Because of its excellent performance and relative economic cost, in Europe and the United States and other developed countries have been greatly promoted and applied. In China, the popularization and application of HDPE double wall corrugated pipe is in the rising stage, which is appraised by the national Chemical Building Materials Testing Center, and all technical indexes meet the standard of use.