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Process for cleaning thermoplasts by friction compacting

  • US 5,306,803 A
  • Filed: 05/17/1991
  • Issued: 04/26/1994
  • Est. Priority Date: 06/02/1990
  • Status: Expired due to Fees
First Claim
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1. A process for the removal of residues in the form of ash-forming impurities, residual solvents and water from a thermoplast, comprising the following steps:

  • introducing a thermoplast between two discs rotating relative to one another, the frequency of rotation of the discs ranging from about 8 sec-1 to about 83 sec-1, said introducing step being carried out by conveying the thermoplast with a screw conveyor to and through a hole in one of the discs, and rotating the screw conveyor opposite to the direction of relative rotation of the discs,the distance between the discs being from 1 mm to 5 mm,separating the residues from the thermoplast by the forces acting on the thermoplast as a result of the rotation, andremoving the processed thermoplast from the outer edges of the discs.

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