The experimental Dehusker for black pepper beans was design and fabricated. The machine is composed of 3-main parts : 1 ) rotating plate (made of perforated metal sheet) 2) station plate 3) bin. The beans were filled in the bin where they were between two plates. When rotating plate was rotated, rubbing would been occurred and dehusked the beans. The experiments were evaluated the effect of variables in process on complete dehusk beans, incomplete dehusk beans and broken beans. Four levels of rotating plate speed (85, 130 and 175 rpm) and dehusk period (3, 5 , 7, 9 and 11 min) were the variables considered in the experimentsThe results shown that rotating plate speed and dehusk period had significant effect on complete dehusk beans , incomplete dehusk beans and broken beans. High rotating plate speed and dehusk period resulted in more complete dehusk beans, less incomplete dehusk beans and higher broken beans. Moreover, statistical analyses showed that the interaction of rotating plate speed and dehusk period had significantly affected on the same results. A good combination of process variables in dehusking is rotating plate speed of 175 rpm and 9 minutes dehusk period. At this process gave 52.50% of complete dehusk beans, 15.23% of incomplete dehusk beans and 32.27% broken beans.
By
Jirasanta Jongjarernkamon
Sureeratana Lerdawassadatrakul
Anucha Homjantara
