PROCESS FOR THE PRODUCTION OF A CYLINDRICAL HEAT SOURCE

摘要

A process for the production of a cylindrical, carbonaceous heat source (4) for a heated smoking article, the heat source having a longitudinal air flow channel extending therethrough, the inner surface of which is covered with a coating layer (22) comprises the steps of: (a) forming the cylindrical heat source (4) by extrusion of a carbonaceous material through a die (6) comprising an orifice (8) with a mandrel (10) mounted therein to form the air flow channel; and (b) applying a fluid coating compound (16) to the inner surface of the air flow channel downstream of the mandrel. The coating compound (16) is fed through a feed passageway (12) extending longitudinally through the mandrel (10) and having an outlet in the end thereof. The coating compound (16) wets the inner surface of the longitudinal channel as a result of forces of adhesion between the coating compound and the inner surface, thereby forming the coating layer (22) as the cylindrical article (4) is extruded.