Separating Characteristics of the Down-flow Vertical Rotating Screen Separator for Brown Rice Separation

Abstract

We investigated the separating characteristics of the down-flow type vertical rotating screen separator for brown rice separation and compared them with those of the up-flow type. The main results were as follows: (1) In the separator having the cylinder rotating speed of -44rpm and helix rotor speed of -320rpm, the separating performance increases as the feed rate of material is increased up to 30kg/min. (2) In the down-flow separator, the separating performance becomes high when the cylinder rotates in the same direction as the helix rotor, but in the up-flow separator it becomes high in the opposite direction. (3) When the feed rate is varied at 10, 20 and 30kg/min under constant rotating speed of the helix rotor, the highest separating performance is obtained at the cylinder speeds of -100, -75 and -50rpm respectively. (4) Using the above-mentioned results (3), we carried out experiments to control the rotating speed of the cylinder suitable for the feed rate of material. Consequently, the high levels of separating performance were obtained at various feed rates.