Process for the production of a cylindrical heat source

Details Process for the production of a cylindrical heat source Process for the production of a cylindrical heat source

B - Operations, Transporting

29

C

B29C 47/02 (2006.01) B05C 3/00 (2006.01)

Patent

CA 2709086

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.

L'invention concerne un processus de production d'une source (4) de chaleur cylindrique carbonée destinée à un article chauffé pour fumeur, la source de chaleur étant traversée par un conduit longitudinal d'écoulement d'air dont la surface intérieure est recouverte d'une couche (22) de revêtement. Le procédé comporte les étapes consistant à : (a) former la source (4) de chaleur cylindrique par extrusion d'un matériau carboné à travers une filière (6) comportant un orifice (8) à l'intérieur duquel est monté un mandrin (10) servant à former le conduit d'écoulement d'air ; et (b) appliquer un composé fluide (16) de revêtement à la surface intérieure du conduit d'écoulement d'air en aval du mandrin. Le composé (16) de revêtement est amené à travers un passage (12) d'amenée s'étendant longitudinalement à travers le mandrin (10) et doté d'une sortie à son extrémité. Le composé (16) de revêtement mouille la surface intérieure du conduit longitudinal du fait des forces d'adhérence entre le composé de revêtement et la surface intérieure, formant ainsi la couche (22) de revêtement tandis que l'article cylindrique (4) est extrudé.

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