Multi stage heater

Details Multi stage heater Multi stage heater

H - Electricity

01

R

309/1, 356/3, 32

H01R 43/02 (2006.01) B23K 1/08 (2006.01) B23K 3/04 (2006.01) G05D 23/19 (2006.01) H05K 3/34 (2006.01)

Patent

CA 1267926

ABSTRACT OF THE DISCLOSURE 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 stage for applying a first quantity of heat to items on the conveyor, a second heater stage downstream of the first heater, a temperature sensing device for determining temperature of items leaving at least one of the heater stages and a control system which compares signals from the temperature sensing device with a predetermined temperature profile to produce a control output to control at least one of the heater stages so that items passing through the heater follow the predetermined temperature profile.

537422

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