The sorter is a kind of sorting equipment that uses the principle of air suspension to separate the mixed powder into light and heavy parts. Under the action of wind conveying, the materials are fully dispersed, and in the falling process, heavier materials fall to the bottom of the sorter; Under the action of cross airflow, the lighter materials, micro powders or fibers will be sucked into the dust box by the suction air generated by the high-pressure fan, so as to separate the plastic from the foam.