Method of and apparatus for expanding tobacco

A - Human Necessities – 24 – B

Patent

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A24B 3/18 (2006.01)

Patent

CA 2212652

A method of and an apparatus for expanding tobacco, particularly tobacco impregnated with solid carbon dioxide are disclosed. The apparatus comprises an arcuate, generally C-shaped duct for conveying the tobacco material in a hot gaseous medium to sublimate the solid carbon dioxide and expand the tobacco. The duct has a non-circular cross-section, preferably a rectangular cross-section, with a high width-to-depth ratio and an increasing depth from the inlet to an intermediate portion of the duct then a decreasing depth from the intermediate portion to the outlet of the duct. A winnower device infeeds the tobacco material into the duct adjacent the throat of a venturi section connected to the inlet of the conveying duct. A tangential separator with an adjustable baffle at the inlet thereof for controlling velocity in the separator is used to separate the expanded tobacco from the gaseous medium.

Méthode et appareil pour dilater le tabac, particulièrement le tabac imprégné d'anhydride carbonique solide. Cet appareil comprend un conduit arqué, généralement en forme de C, visant à acheminer le tabac dans un milieu gazeux chaud pour sublimer l'anhydride carbonique solide et dilater le tabac. Le conduit présente une coupe transversale non-circulaire, de préférence une section rectangulaire. Il a un rapport de largeur à profondeur élevé, ainsi qu'une profondeur croissante de l'entrée à une partie intermédiaire du conduit et une profondeur décroissante de la partie intermédiaire à la sortie du conduit. Un tarare achemine le tabac dans un conduit adjacent à la gorge d'un venturi relié à l'entrée du conduit transporteur. Un séparateur tangentiel ainsi qu'un déflecteur réglable à l'entrée permet de contrôler la vitesse de séparation du tabac dilaté du milieu gazeux.

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