FIELD: removing impurities from comminuted and planed materials and from fibrous materials or wood chips in particular. SUBSTANCE: device has roller line formed by a certain number of abutting parallel revolving rollers. Roller line is provided with at least one roller-to-roller clearance of width B which is larger than width A of clearances in roller pairs preceding wider clearance in the path of material layer movement; width A of roller-to-roller clearances is 0.2 to 0.5 mm. In some cases width B of roller-to-roller clearance is set between 1 and 2.5 m in case sorted-out material is to meet definite specifications. EFFECT: enhanced efficiency of removing impurities detrimental to cutting tools. 4 cl, 1 dwg
