Process for the expansion of tobacco
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United States of America Patent
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-
Dec 22, 1992
Grant Date -
N/A
app pub date -
Mar 22, 1991
filing date -
Apr 4, 1990
priority date (Note) -
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Abstract
A process for the expansion of tobacco, wherein in step (a) the tobacco is cooled by being mixed with cold carbon dioxide; (b) the cooled tobacco is impregnated with liquid carbon dioxide through treatment with gaseous carbon dioxide under a predetermined pressure; (c) the liquid carbon dioxide condensed in the tobacco is converted to solid carbon dioxide through pressure reduction; and (d) the tobacco containing solid carbon dioxide is subjected to a hot gas treatment to achieve the expansion. In step (a) the tobacco is cooled to a temperature of -30.degree. C. to -100.degree. C. through expansion of liquid carbon dioxide and the simultaneous mixing of the tobacco therewith.
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