Chongqing Baoercheng Zhaoliang Technology Co., LTD, is a high-tech enterprise combining R&D, PCT patent licensing, transferring, executing and serving based on its own intellectual property rights and technology. With the innovation and study, its academy has successfully developed the technology of producing hard polyvinyl cholride(PVC) spiral pipe with 300-5000 mm. in diameter, equipment and plastic sectional material for particular use with the pipe, which fills up the vold of large caliber pipe technology in the world and awarded with PCT international patent.