Tobacco dryers
AssigneeBritish American Tobacco (Investments) Limited
InventorsWilliam John Stone, Ian Ernest Tatham, Werner Hirsch, Arno Eugen Weiss
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Abstract
A pneumatic conveyance tobacco dryer which includes a conveyance duct having a first portion, a second, upwardly extending portion and a third, curved portion intercommunicating the first and second portions. A tobacco feed chute extends downwardly and opens into the second portion of the duct. The geometry of the dryer at and in the region of the feed chute is such as to effect the object of reducing the contact of tobacco particles with the inner surfaces of the conveyance duct.
Claims14
A pneumatic conveyance tobacco dryer comprising a pneumatic conveyance duct and a downwardly extending tobacco feed chute, said duct comprising a first portion, a second, upwardly extending portion having a lower end and a third, curved portion extending from the first portion to a junction with the lower end of the second portion and whereby the first portion is in gas flow communication with the second portion, said first portion of the duct being located to one side of said second portion of the duct and a lower end of the feed chute opening into the second portion of the duct at a junction of the second portion of the duct with the feed chute at that side of the second portion of the duct to which side the first portion of the duct is located, wherein in a vertical, axial section of the third portion of the duct, the third portion comprises a curve wherein an interior curved surface at an outside of the curve conforms to a line at constant distance from a first point which is located at a level below the junction of the second and third portions of the duct, and which line continues, at the constant distance from said first point, above the level of said first point.
Dependencies are inferred from the claim text.