On the revolution ratio of two gum-rolls of the huller and its hulling function for paddy

Abstract

In this paper anther practised measurements on P (the required force for hulling action) and H (the hulling rate) of huller, giving one paddy at a time to clearance of two gum-rolls under various R (the revolution ratio). The results obtained may be summarized as follows:
1. The relation between R and P is indicated in fig. 1. The force P makes a rapid rise at larger atio R than 23.5%.
2. The curve shown in fig. 2 means the relation between R and H. Although the rate H is influenced by the clearance of two gum-rolls, it is higher at larger ratio R than 23.5%, too. But in this case the injuring quantity of a hulled rice is increased.
3. From the above results, the practical revolution ratio R in optimum is considered to be about 23%.