DEVICE AND METHOD FOR THERMOFORMING BY HOT-PLATE HEATING

摘要

A thermoforming device using a hot plate heating includes a frame having a base portion, a peripheral wall portion, and a concave portion; a hot plate having a heating surface and a heating unit heats the heating surface; a decompression unit which is connected to the frame, fixes a sheet to an upper end of the peripheral wall portion of the frame, and decompresses an inner portion of the concave portion covered by the sheet; a decompression unit which is connected to the hot plate and sucks the heating surface side; a unit which is connected to the hot plate and opens the heating surface side to an atmosphere or pressures the heating surface side; an adsorption and heating control unit which performs the adsorption and heating operation of the sheet by the hot plate in a state in which the frame and the hot plate come into close contact with each other with the sheet interposed therebetween; a decompression control unit which performs a decompression operation in the concave portion covered by the sheet; and a molding operation control unit which concurrently performs the adsorption and heating operation and the decompression operation, stops the adsorption and heating operation of the sheet after a predetermined time from the start of the operation, and opens a portion between the hot plate and the sheet to the atmosphere or pressures the portion.