Verfahren zur Herstellung von duennen,biegsamen Heizkoerpern nebst Anordnung zum Durchfuehren des Verfahrens

摘要

A method for producing thin flexible heating elements comprising a resistance foil inserted between plastic sheets. A pair of plastic sheets are fed between a pair of welding rollers with a web of resistance foil fed therebetween. A heating chamber encloses the welding rollers and a portion of the plastic sheets upstream of the welding rollers and air is circulated through this chamber to pre-heat the plastic sheets to approximately welding temperature before the sheets reach the welding rollers.