Drying and gas or vapor contact with solids – Apparatus – With means to treat gas or vapor
Patent
1982-03-12
1984-04-03
Schwartz, Larry I.
Drying and gas or vapor contact with solids
Apparatus
With means to treat gas or vapor
34 48, 34 54, 219364, 219486, 219506, F26B 2110, F26B 2112
Patent
active
044399316
ABSTRACT:
Control means for a drier for films or sheets using a minimum of electric power. A heater is connected to a semiconductor switch and an alternating-current power supply in series. An oscillator outputs a pulse to a turn-on terminal of the semiconductor switch via an OR gate in synchronization with a certain phase angle of the wave form of the alternating voltage turning on the semiconductor switch for approximately 10% of the rated value of the heater thereby preheating the heater. When an entrance sensor detects the presence of films or sheets entering the drier, a starting signal is sent to a flip-flop circuit which outputs a high level signal to the turn-on terminal of the semiconductor switch via the OR gate activating the heater to full rated value. The high level signal is also sent to the turn-on terminal of a second semiconductor switch activating a second heater and a blower. When an exit sensor detects the presence of films or sheets leaving the drier, the exit sensor sends a stopping signal to the flip-flop circuit which outputs a low level signal turning off the second heater and blower and returning the first heater to the preheat phase.
REFERENCES:
patent: 3372488 (1968-03-01), Koch et al.
patent: 3878619 (1975-04-01), Hodgett et al.
Dainippon Screen Seizo Kabushiki Kaisha
Schwartz Larry I.
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