FIELD: loose material separation. SUBSTANCE: method comprises steps of charging a material on an upper portion of an inclined roll-type screen, having rolls, longitudinally arranged along a motion direction of the material; imparting to rolls a rotation in the same direction with a rate, increasing or decreasing according to a rotation sign or with the same revolution number of each successive roll relative to a previous one. EFFECT: enhanced efficiency. 1 cl, 4 dwg
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