FIELD: devices for fractionation, in particular of fibrous particles of different sizes, in particular of lignocellulose - and/or cellulose - containing fibers, chips or similar particles. SUBSTANCE: the device has a metering bin with non-fractionated particles, a plane separating device installed behind the metering bin and a feeding assembly of the metering bin and a feeding assembly of the metering bin used for loading of particles from the metering bin onto the surface of the separating device. In the area of the surface of the separating device provision is made for transport facilities with a great number of portioning sections separated from one another that are movable along the surface of the separating device, part of the particles loaded by the feeding assembly onto the surface of the separating device inside each portioning section is transported over the surface of the separating device. EFFECT: enhanced capacity of the device and enhanced quality of separation. 42 cl, 6 dwg
