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The change regularity of heat in adsorption and desorption process of tobacco was investigated, flue-cured tobacco, tobacco sheet, expanded stem, burley tobacco, oriental tobacco as the research objects. With equilibrium water content and water activity with different relative humidity were determined by static sulfuric acid method. The moisture sorption isotherms of tobacco, the water content of the single molecule layer and net isosteric heat of sorption were studied. Results indicated that; l) GAB isotherm model was the tobacco optimal moisture sorption isotherms; 2 ) The variation range of single molecular layer water in tobacco samples was 0.046 ~ 0.103 g/g; 3) The net isosteric heat of sorption decreased with the increase of water content. Under the normal water content conditions, burley tobacco, oriental tobacco, flue-cured tobacco, tobacco sheet, expanded stem required for moisture evaporation energy were in descending order. [ABSTRACT FROM AUTHOR]

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In order to investigate moisture retention of different leaf tobacco materials, the moisture retention of flue-cured tobacco, tobacco sheet expanded stem burley tobacco and oriental tobacco were detected by the moisture content testing glove box. With water losing time fitting curve in water losing process by Weibull model and characterization time parameter α as indicators of material mositure retentivity. The results showed that： Weibull model could be well used for characterization of tobacco samples dryig dynamics; The moisture retentivity in different stalk positions of tobacco ： middle > upper > bottom ； The moisture retentivity in different varieties were as follows ： K326 > Hongda >Yun87;The moisture retentivity in different types of tobacco were as follows： Yun87 C3F > expanded stem > oriental tobacco > tobacco stem > burley tobacco; The material moisture retentivity of freeze-dried sample was better than that of the equilibrium sample. [ABSTRACT FROM AUTHOR]