Abstract: A device for separating impurities in a mass of incoherent materials disposed on a slide, such as a conveyor belt. The device includes a detection device associated with the slide and a separation device. The separation device includes a plurality of deflecting elements suitable to remove, by mechanical separation action and selective discharge, a portion of incoherent material including an impurity.

Abstract: An apparatus and method for separating contaminating particles from an incoherent mass of woody material. The apparatus comprises a separation chamber into which the incoherent mass is introduced, first blowers associated with the separation chamber, to deliver a first flow of air in a direction substantially transverse to the direction of fall of the incoherent mass, and to divert the direction of fall of the woody materials and/or vegetable fibers with at least a first specific weight from the heaviest contaminants materials with a second specific weight, and dividing members disposed inside the separation chamber, in order to define different passage channels. The apparatus comprises first suction means associated with the first blowers, to perform a further separation on the woody and fiber materials with first specific weight. The apparatus comprises second blowers disposed so as to perform a third separation on a first part of the materials already separated by the first blowers.

Abstract: An apparatus and a method to separate particles having a first granulometry, between some hundredths of a millimeter and about 6 tenths of a millimeter, from an incoherent mass of woody material consisting of particles of wood and contaminants, having a second granulometry between some hundredths of a millimeter and about 10 mm. The apparatus has fixed screening elements, substantially tubular in shape, inside which rotary members are mounted rotatable, which impart to the mass a determinate centrifugal force. The fixed screening elements are provided with a plurality of through apertures through which the particles having the first granulometry pass. The apparatus also has command members which impart to the rotary members a determinate peripheral velocity such as to apply to each unitary quantity of mass a centrifugal force sufficient to expel the contaminants having the first granulometry through the through apertures.