Swim-sink tanks use the specific weights of the various kinds of plastic to separate them.
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Examples of typical applications are the separation of PET or PVC (both of which sink) from polyolefins, such as PE or PP (both of which float). The light fraction is transported along the surface of the water by means of paddle drums, whilst the heavy fraction is extracted – depending on its amount – either by pneumatic valves at the bottom of the tank or by a scrape conveyor mounted below the tank.