To investigate the evolving pyrolysis characteristics of tobacco during blending,conveying,and rolling,we tracked and analysed changes in the heat loss characteristic parameters at different processing stages using thermogravimetric analysis technology and thermal analysis kinetic method.The results indicated that:(1)pyrolytic weight loss of tobacco remained consistent throughout various processing stages,including dehydration,drying,loss of volatile components,hemicellulose and cellulose decomposition,lignin decomposition and charring,and inorganic salt decomposition.The temperature intervals between the different heat loss stages of the samples were consistent,but the rate of weight loss varied.(2)During the inorganic salt decomposition stage,JXQ,JXH,and CPS samples exhibited weight loss rates that were significantly higher than those of the other samples.The composite pyrolysis indices(CPIs)of the different tobacco samples ranged from 4.10×10-5％·(min ×℃2)-1 to 4.65×10-5％·(min ×℃2)-1,with the BZS sample having the lowest CPI.The CPIs showed a decreasing trend with each processing session.(3)The thermal decomposition processes of the samples during dehydration,drying,and cellulose decomposition followed the F1.5-level chemical reaction model.However,the pyrolysis kinetic parameters varied among the different samples.It has been revealed that there are differences in the kinetic parame-ters of chemical reactions during pyrolysis.Additionally,there may be fluctuations in the formulation composition of tobacco during processing.
cut tobaccouniformityblendingpyrolysis characteristicsdegree of difference
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