Threshing and Classification

Description

Threshing and Classification – Finally, it is time to separate the tobacco leaves from the stems. The plant used for this purpose consists of a thresher in which a rotor with metal teeth rotates against a fixed basket. The tobacco leaves pass through the basket and are cut smaller by the metal teeth. The tobacco leaves are collected in large containers located in the bottom half of the thresher. So-called classifiers, which use a vertical air stream, then sort the tobacco leaves according to weight: light, stem-free lamina is sent onwards, while heavy lamina that contains stems is passed through the thresher again – and this is repeated until even the smallest shreds of lamina have been removed from the stem. After threshing, the de-stemmed lamina is re-combined with the lamina tips cut off previously and conveyed for re-drying