HEAT TREATMENT METHOD OF DEFORMED LENGTHY MOLDING

摘要

PROBLEM TO BE SOLVED: To provide a heat treatment method of a deformed lengthy molding which relaxes stress remaining in the molding when the deformed lengthy molding is subjected to thermoforming such as extrusion molding. SOLUTION: In the heat treatment method of the deformed lengthy molding 8, the thermoformed deformed lengthy molding of a thermoplastic resin is heated rapidly by an infrared heater until the surface temperature of the molding reaches a temperature in a range of the glass transition temperature of the thermoplastic resin of±20°C and is then supplied to a heating vessel the temperature of which is set to be in a range of the glass transition temperature of the thermoplastic resin of±20°C to be annealed. COPYRIGHT: (C)2008,JPO&INPIT