To further understand the effect of tobacco stems in tobacco blend, a detailed comparative study of chemical components of tobacco leaves and stems before and after combustion was carried out.

And the surface material includes propanediol, which is capable of enhancing moisture keeping performance of tobacco leaf, making leaf crushing in the cutting process uneasy, and yield high.

The experiments on grouping processing of tobacco were carried out, tobacco leaves were grouped, blended, cased, and dried in different ways suitable to their quality characteristics.