Multi stage heater

Details Multi stage heater Multi stage heater

1986-07-01

1988-10-04

Pellinen, A. D.

Electric heating

Heating devices

Combined with container, enclosure, or support for material...

228 9, 228102, 236 15BC, 432 53, F27B 906

Patent

active

047757760

ABSTRACT:
A multi stage heater heats items on a conveyor so that they follow a predetermined temperature profile. The heater is used for printed circuit boards or the like when heated for soldering and avoids thermal gradients that can occur with heating different materials. The heater has a first heater for applying a first quantity of heat to items on the conveyor, a temperature sensing device for determining temperature of items leaving the first heater, a second heater downstream of the first heater and a control system which compares signals from the temperature sensing device with a predetermined temperataure profile to produce a first control output to control the first heater and a second control output to control the second heater so that items passing through the heater follow the predetermined temperature profile.

REFERENCES:
patent: 4245613 (1981-01-01), Wells et al.
patent: 4354095 (1982-10-01), DeVries
patent: 4517448 (1985-05-01), Crain et al.
patent: 4565917 (1986-01-01), Furteck
patent: 4605161 (1986-12-01), Motomiya et al.

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