out of 5

The material arriving at a regular rate is spread by a feed gate across the entire width of the screen. İn the screening zone, a current of air passes through the material from bottom to top.The supporting layer of air causes the material to be stratified according to its specific gravity, in the second zone the heaviest material which includes stones drops throught the large screen perforations directly onto the destoning screen.The mixed fraction is fed directly to the outlet. Thanks to this arrangement, the workload on the destoner is considably reduced. By appropriate selection of the gate position it is possible to control the volume of the mixed fraction without affecting the classifying and destoning action.

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