Radial lamination of coaxial thermoplastic tubes - to make composite oriented pipe, to stiffen sockets or provide thermal insulation

摘要

Laminated thermoplastic pipe in which =1 layer is oriented, are made by mounting coaxial lengths of prefabricated pipe in a split mould in which the pipes can be heated by a hot fluid and then internally pressurised to dilate and laminate the pipes radially. Used for mfr. of pressure pipe of e.g. PVC, polyolefin or ABS with one or more external laminated sheaths over part or all of the length of the pipe to stiffen socket mouths and/or provide thermal insulation and/or a reflective or light coloured surface for dissipating impinging solar radiation.