TOBACCO MATERIAL EXPANSION METHOD AND DEVICE

摘要

A tobacco material expansion method contains: a step for rotating tobacco material and contacting the same with a water vapor flow of 100-160°C, and moistening and expanding the tobacco material; and a step for contacting the moistened and expanded tobacco material with a superheated water vapor flow having a higher temperature than that of the water vapor flow, and drying the shredded midrib. This expansion method makes it is possible to increase the expansion properties of the tobacco material compared to the prior art.