بررسي اثر دور توپي و سطح مقطع خروجي در ماشين سفيدكن تيغه اي ، بر روي ميزان شكستگي برنج

Effects of Hub Round Speed and Outlet Area in Milling Machine on Breakage of Rice Grains

Nowadays losses in rough rice milling process is a big problem in Iran. Wrongly operating the processing machines, including whitening apparatus, is one of the most important factors that has a remarkable effect on the grain breakage level and grain quality losses. In order to evaluate the effect of whitening machine parameters on breakage of rice grains, long-grain Khazar variety was selected. The effects of two operating variables, hub speed (in six levels: 650, 700, 750, 800, 850 and 900 rpm) and machine outlet cross-sectional area (in five levels: 615, 660, 705, 750 and 795 mm2) were investigated. Results showed that by increasing hub speed from 650 to 900 rpm, rice grain breakage increased. It was also concluded that the cross-sectional area of the machine outlet was the most important factor in grain breakage level; and increase of this variable, grain breakage level will decreased. It was shown that the highest breakage percentage corresponded to the combination of hub speed of 900 rpm and outlet area of 615 mm2; and the lowest breakage percentage corresponded to the combination of hub speed of 800 rpm and outlet area of 705 mm2.