Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling heat transfer with molding material
Patent
1984-08-03
1990-06-12
Lorin, Hubert C.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling heat transfer with molding material
264 401, 264553, 264 25, 425143, 425526, B29C 4964
Patent
active
049331264
ABSTRACT:
An improved temperature sensing and controlling arrangement for incorporation in thermoplastic heat forming systems includes an infrared thermometer operative to sense the temperature of a plastic sheet during its heating and to produce a direct current output in linear proportion to the intensity to the radiation emitted by the sheet, an electrical relay assembly operative to receive the direct current from the thermometer and to energize and de-energize a relay when the value of the direct current is below or at or above a predetermined value corresponding to a predetermined maximum temperature to which the sheet is to be heated, and a programmable microprocessing sequencer operatively associated with the relay assembly and the heating oven to de-energize and energize the oven when the relay is energized and de-energized, respectively. This temperature control arrangement causes alternate energization and de-energization of the oven in rapid cyclical repetition to prevent the sheet from being heated above the predetermined temperature while maintaining the sheet substantially at such temperature.
REFERENCES:
patent: 3359600 (1967-12-01), O'Brien et al.
patent: 3568253 (1971-03-01), Schwartz et al.
patent: 3865912 (1975-02-01), Rosenkranz et al.
patent: 4391663 (1983-07-01), Hutter
patent: 4506144 (1985-03-01), Hesford et al.
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