PURPOSE: To enable heating speed to be heightened without applying mechanical stress to high molecular material by a method in which the heating medium gasified by preheating is caused to be in contact with high molecular material and is condensed, and then it is heated by microwave induction heating.
CONSTITUTION: A heating medium is heated by a heater 8 and becomes gaseous heating medium 7b, and then is blown to high molecular material 2 through a blowing nozzle 9 by way of a gas flowing device 11. Because the temperature of the high molecular material 2 adjacent to the inlet of a preheater 6 is low, when the gaseous heating medium 7b is in contact with the high molecular material 2, said medium 7b is condensed, and heightens the temperature of the high molecular material 2, giving its condensation heat to said material 2. The preheated high molecular material is moved to a microwave heater 12 at the state where the condensed heating medium 7c has adhered to its surface, and is heated to the temperature of heat treating operation. Simultaneously, the heating medium 7 adhering to its surface is removed by evaporation. Because the value (rtanδ) of the high molecular material 2 is sufficiently large by preheating, it is effectively heated in short time by microwave.
KURITA KAZUO
MORIGUCHI TETSUO
MINOWA YOSHIFUMI
MITSUBISHI ELECTRIC CORP