Improved method and apparatus for shaping thermoplastic tubes

摘要

A method and apparatus for forming a bend in a tube 1 of thermoplastic material by heating a pre-formed bend to a pre-determined temperature and maintaining the temperature substantially constant by the pulsed emission of infra-red radiation from one or more infra-red sources 2 in response to the surface temperature of the tube 1 detected by a remote temperature sensor 5.