Research on the Characteristics of Hot and Drying Kinetic and Shrinkage Kinetic of Redrying Tobacco Strips

In order to study the effects of different hot air temperature, wind speed on the mesh belt, and material accumulation thickness on the drying characteristics and shrinkage characteristics of redrying tobacco strips. In this paper, five drying kinetic models and three shrinkage kinetic models were used to non-linearly fit the characteristic curves obtained under different experimental conditions, and R-squared (R2), Sum of Squared Error (SSE) and root mean square error (RMSE) were used as the evaluation indicators of fitting accuracy. The test results show that the hot air temperature, wind speed on the mesh belt and material accumulation thickness have significant effects on the drying characteristics and shrinkage characteristics of redrying tobacco strips. The Midilli-Kucuk model can better simulate the drying process of redrying tobacco strips under different dry conditions. The Weibull distribution function can better simulate the shrinkage process in the drying process of redrying tobacco strips. The drying activation energy and shrinkage activation energy of redrying tobacco strips were obtained by Arrhenius calculation formula, which were 30.03 kJ/mol and 23.23 kJ/mol, respectively. This study provides theoretical basis and technical support for the relationship, predicting and regulating the relationship, prediction and regulation of the water migration and tobacco strips area shrinkage and changes during the hot air drying process.