Thermoplastic pipe bending method uses a collapse prevention core with a PTFE surface to give a smooth internal surface

摘要

A core(2) with a surface made of Teflon(polytetrafluoroethylene) is inserted into a plastic pipe(1) to act as a support and prevent wall collapse during bending. The assembly is placed in a half open mold and the mold and pipe heated for bending. A core(2) with a surface made of Teflon(polytetrafluoroethylene) is inserted into a plastic pipe(1) to act as a support and prevent wall collapse during bending. The assembly is placed in a half open mold and the mold and pipe heated for bending. The supporting core can be a solid bar of Teflon. Alternatively the core may be a coiled spring(3) with a tubular cover(4) of Teflon, which is inserted into the pipe with slight play between itself and the pipe wall.