FIELD: pulp-and-paper industry, in particular, sorting of wood chips. SUBSTANCE: apparatus has screen deck with at least two independent grids made from beams mounted in alternation for movement in opposite phase in vertical and horizontal planes. At least one grid has two groups of beams with upper surfaces positioned in two different planes. Apparatus is further provided with device for feeding and distribution of material at receiving end of deck. EFFECT: increased efficiency in sorting out of material and enhanced reliability in operation. 7 cl, 17 dwg
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