Method for granulating and crystallizing thermoplastic polymers
AssigneeAutomatik Plastics Machinery GmbH
InventorsAndreas Doll, Frank Glöckner
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Abstract
The invention relates to a method for granulating and crystallizing thermoplastic polymers, the granules being contained in a liquid after granulation of a polymer melt and the granules being nucleated in the liquid once the pressure of the liquid is increased and the temperature of the liquid is increased, and the granules being crystallized in the liquid once the pressure of the liquid is again increased and the temperature of the liquid is again increased. According to the invention, the granules are removed from the liquid once the pressure and the temperature of the liquid containing the granules have been reduced.
Claims23
A method for granulating and crystallizing thermoplastic polymers, comprising:
- granulating a polyester melt for the purpose of producing granules;
- supplying the granules to a liquid under a pressure d1 and at a temperature T1;
- increasing the pressure of the liquid, including the granules contained thereon, to a pressure d2>d1;
- and
- increasing the temperature of the liquid, including the granules contained therein, to a temperature T2>T1;
- nucleating the granules in the liquid under the pressure d2 and at the temperature T2;
- increasing the temperature of the liquid, including the granules contained therein, to a temperature T3>T2;
- crystallizing the granules in the liquid at the temperature T3;
- decreasing the pressure and temperature of the liquid, including the granules contained thereon, to a pressure d4 and a temperature T4;
- and
- separating the granules from the liquid.
Dependencies are inferred from the claim text.