Patent ID: 8511476

Claim:
An apparatus for separation of at least two synthetic materials in particulate form having different characteristics, the apparatus comprising: a rotating drum ( 2 ) having a cylindrical shape with a tapered truncoconical end ( 21 ) and an opposite flat bottom wall ( 221 ); a device ( 234 ) configured to set the drum in rotation; a conduit ( 24 ) configured to introduce into the drum ( 2 ) a mixture composed of at least two synthetic materials in particle form, having different specific weights, and of a liquid, having an intermediate specific weight relative to the specific weights of the two products; a radial discharge hole ( 5 ) located in the lateral wall of the tapered end of the drum; an axial slithering discharge opening ( 6 ) located in the flat bottom surface ( 221 ) of the drum, at a distance d from the axis of the drum ( 2 ); a rotor ( 3 ) located inside the drum ( 2 ) provided with a first external helical blade ( 32 ) having the same external shape as the drum ( 2 ) shape and having respective cylindrical ( 322 ) and tapered conical ( 321 ) portions; a device ( 313 ) configured to set the rotor ( 3 ) in rotation relative to the drum ( 2 ), in such a way that the rotor pushes the material towards the tapered end of the drum; wherein the first external helical blade ( 32 ) extends along the entire length of the drum ( 2 ) and is located at a distance from the axis of the rotor and of the drum greater than the distance between the drum axis and the axial discharge opening provided in the non-tapered section drum bottom, wherein the rotor ( 3 ) comprises a second helical blade ( 320 ), inside the first helical blade ( 32 ) and wrapped at a distance from the drum axis in an opposite direction than that of the first helical blade ( 32 ), the second helical blade ( 320 ) extending for the entire length of a cylindrical tract ( 22 ) of the drum ( 2 ), and being supported to the first helical blade ( 32 ) at cross points with the first helical blade ( 32 ) to leave free the axial portion of the drum.