A reflow apparatus for soldering has a tunnel and a pipe which form an endless passageway for hot gas. Infrared panel heaters are disposed inside the tunnel for heating printed circuit boards which travel through the tunnel on a conveyor. Hot gas is made to circulate through the passageway by a flow-producing...http://www.google.es/patents/US4951401?utm_source=gb-gplus-sharePatente US4951401 - Solder reflow apparatus
