Back to results
US 5,306,803 AGranted
Process for cleaning thermoplasts by friction compacting
AssigneeBayer Aktiengesellschaft
InventorsWolfgang Arlt, Manfred Schmidt, Thomas Fischer, Ralf Lange
Life of this patent
Estimating the term…
Abstract
A process for cleaning thermoplasts is described. The thermoplast to be cleaned is introduced between the discs of a plast compactor and substantially freed from unwanted residues from the polymerization process by the force and rise in temperature produced by the movement of rotation.
Claims3
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.sup.-1 to about 83 sec.sup.-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, and
- removing the processed thermoplast from the outer edges of the discs.
1 more element
Dependencies are inferred from the claim text.