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Abstract

The detailed fundamental experiments about heat drying of tobacco shreds were carried out in order to obtain the effect of heat drying condition on the filling capacity of tobacco shreds which were heated in the dryer used in the process of the cigarettes manufacturing industry.The variadrying (14-22% WB), their specific volume (1.5-13.0cc/g) and their size determined by sieving(1-4mm) etc. The varieties of tobacco used were the flue-cured and the domestic.The important results obtained are as follows:(1) When the wall temperature and the air temperature became higher, and when the drying time was longer, the filling capacity of tobacco shreds increased.(2) In order to increase the filling capacity of shreds, the drying with heated wall was more effective than that with heated air.(3) By means of an analysis of multiple regression formula among the filling capacity and other parameters representing the magnitude of thermal effects on tobacco, (that is, the temperature of tobacco shreds and their moisture content at the last moment of drying), it was clear that the influence of shreds temperature on filling capacity was greater than that of the moisture content of shreds.(4) The effects of both moisture content and specific volume of shreds before drying on filling capacity were smaller than that of the wall temperature.The tendency of variation of filling capacity with the change of size of shreds in the flue-cured variety differed from that in the domestic variety.