Tobacco – Tobacco treatment – Puffing
Patent
1989-08-18
1991-11-19
Millin, V.
Tobacco
Tobacco treatment
Puffing
131296, A24B 318
Patent
active
050657747
ABSTRACT:
The invention is directed to a process for increasing the filling capacity of tobacco under moderate conditions of temperature and pressure. Tobacco is impregnanted with a low boiling impregnant and thereafter subjected to a pre-expansion treatment. The pre-expansion treatment includes a pre-expansion temperature which is above the atmospheric boiling point of the impregnant and which is at least ten degrees below the critical temperature of the impregnant; and a pressure which is at least five atmospheres above the boiling point pressure of the impregnant at the pre-expansion temperature. Under these conditions, the impregnant is maintained primarily in the liquid phase throughout the pre-expansion treatment. Following the pre-expansion treatment, the pressure of the treated tobacco is rapidly reduced to a pressure below the boiling point pressure of the impregnant to thereby effect tobacco expansion without the need for a separate heating step.
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Edwards Michael E.
Frederickson James D.
Grubbs Robert E.
Haberkern Richard G.
Millin V.
Myers Grover M.
R. J. Reynolds Tobacco Company
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