烟草孔隙结构与其物理保润性能的关联性分析

Correlation between physical moisture retention propertyin tobacco samples and its pore structure

采用烟草动态含水率监测装置在温度(22±1)℃、相对湿度30%环境下测定(1次/min)烤烟、白肋烟、香料烟、再造烟叶与膨胀梗丝共计26个烟草样品在4 000min以上时间内的失水速率,并由失水速率计算出其热力学Weibull模型中的α值和β值;压汞法测定烟草样品孔隙结构,并对样品Weibull模型中的α值和β值与其孔隙结构进行相关分析。结果表明:在相同的贮存温度、湿度下和相同的时间内再造烟叶与膨胀梗丝样品的失水速率最大,白肋烟和香料烟样品其次,烤烟样品最低;试验样品Weibull模型中α值和β值均与其微孔平均微孔直径呈显著负相关,烟草样品的保润性能均与其微孔的平均微孔直径显著负相关。

In order to understand the relationship between the moisture content of tobacco and its microporous structure,and to provide a theoretical basis for the preservation of tobacco,the dehydration rate over 4 000 min of 26 Tobacco samples including flue-cured tobacco, burley tobacco, oriental tobacco,reconstituted tobacco leaf and expanded cut stems were measured(1 time/min)at a temperature of(22±1)℃ and a relative humidity of 30% using a tobacco dynamic moisture content monitoring device.Theαandβvalues in the thermodynamic Weibull model were calculated from the dehydration rate.Results:At the same storage temperature,humidity and the same time,the rate of water loss of the reconstituted tobacco leaves and the expanded cut stem samples was the highest,followed by the burley tobacco and the oriental tobacco samples,and the flue-cured tobacco sam-ples were the lowest.The values ofαandβin the Weibull model of samples were significantly negatively correlated with the average pore diameter of the microwells.The moisture retention properties of tobacco samples were significantly negatively correlated with the average pore diameter of their micropores.