Process for cleaning thermoplasts by friction compacting
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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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.
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Citations
3 Claims
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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:
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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, and removing the processed thermoplast from the outer edges of the discs. - View Dependent Claims (2, 3)
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Specification
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Current AssigneeBayer AG
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Original AssigneeBayer AG
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InventorsSchmidt, Manfred, Arlt, Wolfgang, Fischer, Thomas, Lange, Ralf
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Primary Examiner(s)Kight, III, John
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Assistant Examiner(s)Dodson, Shelley A.
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Application NumberUS07/702,047Time in Patent Office1,075 DaysField of Search528/500, 528/501, 528/502, 528/480US Class Current528/480CPC Class CodesB29B 17/02 Separating plastics from ot...B29B 2017/0286 Cleaning means used for sep...C08G 64/406 Purifying; DryingC08G 75/0281 Recovery or purificationC08G 85/00 General processes for prepa...Y02W 30/62 Plastics recycling; Rubber ...
