Patent ID: 8109392

Claim:
An assembly to remove lighter impurities from crushed heavier material that is to be recycled, the assembly comprising: a first screen configured for the crushed material to be delivered thereto, said first screen having an outlet; a second screen configured for the crushed material that has passed through the first screen to be delivered thereto, said second screen having an outlet; a first chute positioned to receive the crushed material from said first screen outlet; and a second chute positioned to receive the crushed material from said second screen outlet; wherein each chute comprises: an interior configured for the crushed material to pass therethrough under the influence of gravity, an impurities outlet disposed on a first side of each chute, and an air outlet disposed on a side of each chute opposite said impurities outlet so that an air stream entering said interior from said air outlet passes across said interior towards said impurities outlet; and a blower connected to each air outlet to deliver air thereto so that said air stream passes through the crushed material passing along the associated chute to engage the impurities to deliver the impurities to the associated impurities outlet while permitting the crushed material to continue along said associated chute.