Method and apparatus for low residence time redrying of tobacco

Details Method and apparatus for low residence time redrying of tobacco Method and apparatus for low residence time redrying of tobacco

A - Human Necessities

24

B

A24B 3/04 (2006.01) A24B 3/10 (2006.01)

Patent

CA 2246050

A method and apparatus is given for a low residence time redrying of strip tobacco. The apparatus thoroughly and evenly dries and cools the tobacco consistently through the entire tobacco bed as it passes through the dryer (38) and cooler (32). The apparatus utilizes a plurality of individually controlled fluidized bed heating zones (22-30) for drying the tobacco. An additional fluidized bed cooling zone (32) is provided to cool the tobacco prior to reordering. A continuous conveyer (14) extends through the heating zones and cooling zones. A steam tunnel (40) is utilized to raise the moisture content of the dried tobacco to preselected moisture levels. A vibrating conveyer (60) moves the tobacco through the steam tunnel.

L'invention porte sur un procédé et un appareil réduisant le temps de séchage du tabac en bandes. L'appareil, qui sèche et refroidit régulièrement le tabac sur toute son épaisseur lors de son passage par les étages de séchage (38) et de refroidissement (32), comporte plusieurs lits fluidisés (22-30) à commande individuelle pour le séchage, plus un lit fluidisé additionnel (32) pour son refroidissement avant reconditionnement. Un même convoyeur continu (14) traverse les zones de séchage et de refroidissement avant la remise aux normes. Un tunnel (40) à vaporisation ramène le degré d'humidité à un niveau préétabli. Le tabac traverse le tunnel sur un tapis vibrant (60).

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