Heating – Processes of heating or heater operation – Continous strip – strand or web passed longitudinally through...
Patent
1990-10-02
1991-09-03
Yuen, Henry C.
Heating
Processes of heating or heater operation
Continous strip, strand or web passed longitudinally through...
432 10, 432 24, 432 18, 432 59, F26B 1300
Patent
active
050449389
ABSTRACT:
Disclosed is a method of controlling the temperature of a joining area between two different strip materials in a continuous strip processing line. In the case where a strip material after the joining area requires a nozzle pressure greater than that of a preceding strip material, the opening of a damper is initially gradually throttled, at a timing before the joining area passes through a predetermined location in a treating furnace, by an amount required for changing the nozzle pressure so that an optimum pressure of the preceding strip material is changed so that of the following strip material. The rotational speed of a recirculation fan is then raised to keep the nozzle pressure substantially constant, and the damper is rapidly opened to the opening before the throttling at a time the joining area passes through the predetermined location. In the case where a strip material after the joining area requires a nozzle pressure less than that of a preceding strip material, the damper opening is initially rapidly throttled at a timing the joining area passes through the predetermined location so that an optimum pressure of the preceding strip material is changed to that of the following strip material. The damper is then gradually opened to the opening before the throttling, and the rotational speed of the recirculation fan is gradually reduced to keep the nozzle pressure substantially constant.
REFERENCES:
patent: 3170681 (1965-02-01), Davies
patent: 4116620 (1978-09-01), Stibbe
patent: 4243441 (1981-01-01), Wilson
patent: 4371332 (1983-02-01), Matsuo et al.
patent: 4577278 (1986-03-01), Schannon
patent: 4767320 (1988-08-01), Sasaki et al.
patent: 4789332 (1988-12-01), Ramsey et al.
Shirono Hiroshi
Tanabe Masao
Chugai Ro Co. Ltd.
Yuen Henry C.
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