Vorrichtung zum Erhitzen einer Materialbahn

摘要

For use in forming a web into a tubular shape, and heat-sealing an inner surface of an outer edge of the web and an outer surface of an inner edge of the web to provide a lap, a web heating device (13) for heating the outer edge inner surface of the web (W) with hot air before heat-sealing comprises transport means for transporting the web along a predetermined path, a nozzle (27) having hot air outlet openings (67) directed outward as opposed to the outer edge inner surface of the web to be transported by the transport means, and a baffle plate (32) so disposed as to be opposed to the hot air outlet openings with the outer edge of the web positioned therebetween.