Method of heating thermoplastic resin sheet or film

Electric heating – Heating devices – Combined with container – enclosure – or support for material...

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4251744, 425DIG13, H05B 102

Patent

active

046348409

ABSTRACT:
A broad and continuous sheet or film is uniformly heated in a highly precise manner and with a specific heat profile by using a plurality of radiation heating furnaces, wherein in the interior of each radiation heating furnace, a plurality of rows of heaters are arranged rectangularly to the direction of delivery of the sheet or film to be heated. A thermometer for measuring the temperature of the sheet or film is arranged in the vicinity of an outlet for the sheet or film outside each radiation heating furnace. Outputs of heaters arranged within the radiation heating furnaces located just before the respective thermometers are controlled based on the temperatures detected by the respective thermometers by using a computer.

REFERENCES:
patent: 1519287 (1924-12-01), Woodson
patent: 2146427 (1939-02-01), Hawkins
patent: 2391195 (1945-12-01), Ross
patent: 2674809 (1954-04-01), Meinhofer
patent: 2952097 (1960-09-01), Atkeson
patent: 3801426 (1974-04-01), Putman
patent: 3956612 (1976-05-01), Ballard
patent: 4188731 (1980-02-01), Rauskolb
patent: 4202112 (1980-05-01), von der Eltz
patent: 4306856 (1981-12-01), Arippol
patent: 4486172 (1984-12-01), Dunning

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