Qingdao Yifeng Plastic Machinery Co., Ltd.is specialized in the design,manufacture of HDPE Production Line of Corrugated Tube for Pre-Stress Cement. The raw material of the plastic corrugation pipe is HDPE, resisting corrosive, acid and alkali, preventing the prestressing muscle from boing eroded. Many prestressing structure suffor severe influence from environment, such as deice salt or brine. Metal pipe have not permanent anticorrosive capability, cannot resist water lcakage, while plastic corrugation is capable to provide a barrier protection for prestressing muscle, prevent the injurant pollution from penetrating the pipe, therefore, good pordurable performance of prestressing structure is guaranteed. Qingdao Yifeng Plastic Machinery Co., Ltd. principal products（Website：http://www.yifengjixie.com）