초록 ▼

An air classifier for separating light reusable materials from a stream of non-shredded solid waste is provided. The air classifier employs two operating phases. The first operating phase, the desired light fraction is entrained in an air stream and is conveyed above the remainder of the solid waste

An air classifier for separating light reusable materials from a stream of non-shredded solid waste is provided. The air classifier employs two operating phases. The first operating phase, the desired light fraction is entrained in an air stream and is conveyed above the remainder of the solid waste. The waste material is then received by a second conveyor so that the lighter fraction is received on top of the heavier fraction. Thus, the first phase of the apparatus effects mass stratification. During the second operating phase, the light fraction is actually removed from the heavy fraction by a high velocity air stream which is preferably induced by a reducing cross-section portion of the apparatus. The air flow through the apparatus is captured and recycled and the light fraction being separated therefrom in, for example, a cyclone.

대표청구항 ▼

An apparatus for separating a light fraction from solid, non-shredded waste material, comprising first conveying means for conveying waste material along a first conveyance path; first inlet means for delivering waste to be separated to said first conveying means; means for directing a first air str

An apparatus for separating a light fraction from solid, non-shredded waste material, comprising first conveying means for conveying waste material along a first conveyance path; first inlet means for delivering waste to be separated to said first conveying means; means for directing a first air stream to and along said first conveyance path in a direction of conveyance thereof so that light fraction materials in said delivered waste are entrained in said air stream and carried along said conveyance path vertically above a heavier fraction of said delivered waste; second conveying means for conveying waste material along a second conveyance path, said second conveying means receiving delivered waste material form the said first conveying means so that the delivered waste material falls down and is stratified on said second conveying means with said heavier fraction thereof disposed substantially adjacent said second conveying means and said light fraction thereof is disposed substantially vertically above heavier fraction; and a housing surrounding and enclosing at least said second conveying means and the delivered waste material thereon, said housing receiving said first air stream, so that said first air stream flows longitudinally therethrough, said housing having a heavier waste material outlet and an air outlet for air and light fraction waste material entrained therein, said housing defining an air duct extending longitudinally of said second conveying means, a vertical cross-section of said housing varying along the length of said second conveying means so that said air duct has a reduced cross-section along at least a portion of the length of said second conveying means whereby the velocity of air flowing through said duct increases at said reduced cross-section portion to thereby pick up and entrain light fraction material disposed on and above said second conveying means and conduct said light fraction through said air outlet.