Plastic separation method
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United States of America Patent
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Sep 7, 1999
Grant Date -
N/A
app pub date -
Feb 21, 1997
filing date -
Feb 21, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention pertains to the separation of mixtures of plastics, contaminated with, among other things, mineral heavy materials such as e.g. sand or metal refuse. Separation occurs according to density in a separating liquid in the centrifugal field of the rotating suspension. The present invention provides the connection of a hydrocyclone before a separating centrifuge. The mineral heavy materials are separated in advance in the hydrocyclone and the plastic mixture is further separated in the centrifuge. Wear on components of the separating centrifuge caused by these heavy materials can be avoided, and in some applications a second separating stage at a higher separation density can be eliminated.
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