Separation quality in the ppm range (e.g. for PET bottles) is achieved by a second separation stage, consisting of a heavy particle and hydrocyclone system. Depending on the task, the separation stages – swim/sink tank and hydrocyclone separation system – are used either individually or in combination.
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Hydrocyclones are being offered for similar separation tasks like the swim-sink tanks in special cases where cyclones achieve a better separating efficiency than swim-sink tanks. This unit works with a pressure force of a feeding pump and reaches a higher separation effect (approx. 20 times earth’s gravity) by using the rotational forces of the moving water. The PE/PP material is leaving the Hydrocyclone at the upper end with the mainstream of the water, sinking material, PET, at the lower end with only small amounts of water. By choosing the nozzle sizes at the outlets of the cyclone the selectivity can be adjusted. Necessary equipment of a hydrocyclone circuit is a mixing tank (turbo washer), a feeding hydro.