| 摘要 |
A process for expanding tobacco in which, (1) the tobacco is provided for processing with a moisture content not exceeding that normally present in manufactured tobacco products, (2) the tobacco may be frozen, depending on the fineness of control available in the subsequent heating step, and (3) the tobacco is rapidly heated by a stream of gas to vaporize a portion of its water content and effect the expansion, whereas the temperature of said gas is from about 150<o> C to about 450<o> C, and the relative velocity between said gas and said tobacco particles is from about 4,5m/sec to about 45m/sec, over substantially the entire residence of the tobacco in said gas stream. |
