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 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.

Abstract: Apparatus (10) and method to separate a loose mass formed by elements or materials (11) of different sizes, such as woody strands or wafers, comprising a separation chamber (13) into which the mass is inserted, a plurality of riddling rolls (16), mounted inside the chamber (13) rotating on axes of rotation parallel to each other and lying sybstantially on a same plane (X). Each of the riddling rolls (16) comprises a plurality of riddling elements (20), each of which is substantially square in shape, so as to form four cusps (22) in correspondence with the four tips of the square. The riddling elements (20) are adjacent to each other so that the cusps (22) form a plurality of grooves (24), and the riddling rolls (16) are axially staggered therebetween so that the cusps (22) of each roll (16) are constantly inserted, more or less deeply into the corresponding grooves (24) of the adjacent riddling roll (16), so as to define discharge apertures (25) with an alternated profile.

Abstract: Device incorporating rollers to separate particles of different gradings a plurality of adjacent rollers (11) forming a selection bed where each roller (11) has a surface conformation defining a plurality of circumferential peaks (12) alternating with circumferential grooves (13), the rollers (11) including at least a working position where the grooves (13) of one roller are facing and at least partly penetrated by the peaks (12) of the adjacent roller (11), the discharge gap (18) between the two adjacent rollers (11) having a substantially zig-zag development, in at least some rollers (11) the connection surface (26) between the peaks (12) and grooves (13), and/or the peaks (12) and/or the grooves (13) themselves being at least partly worked with protuberances, protrusions, hollows and/or facets (23, 24, 25).