Abstract
In order to find the best separating condition of brown rice in a lean year, an experiment was carried out with the trommel type separator. And we examined how to determine the best slit width of the cylinder using the hand sieve. The main results were as follows:
(1) In the separation of a poor crop they should make the slit width of the cylinder narrower. And they can relax separating degrees of grain using the higher feed rate and the shorter effective screen length.
(2) In order to determine the best slit width of the cylinder of the trommel type separator, they should separate brown rice using the separating cylinders or the hand sieves with various slit widths. And they have to measure mature grain percentage of oversize product, percentage of oversize product to feed material and bulk density of undersize product, and thereby calculate the cost per unit mass of brown rice.
(3) The narrower they make the slit width of the cylinder, the higher the cost per unit mass of brown rice is, if quality grade of overproduct is same.
