The tangential inlet accelerates the stock to downward centrifugal motion. Due to centrifugal rotation of the rotor, the Impurities with high specific gravity are forced to the outer wall of cone and downward to collect in a trap. The cleaned stock is discharged from the cleaner through a central discharge pipe from the bottom side.

The timer controlled pneumatic valves operate automatically discharging the dirt from the dirt vessel. The dirt vessel is provided with connections for flushing water for fiber saving. The water flow rate is adjusted by the valves so that the fiber loss is insignificant.