Method for the production of polyester granulates from highly viscous polyester melts and also device for the production of the polyester granulates
AssigneesUhde Inventa-Fischer GmbH, BKG Bruckmann & Kreyenborg Granuliertechnik GmbH
InventorsKurt Hanimann, Eike Schulz Van Endert, Theodor Anton Bruckmann
Life of this patent
Estimating the term…
Abstract
The invention relates to a method and device for the direct production of polyester granulate from a highly viscous polyester melt with a polymerization degree of 132 to 165, as well as the granulates formed thereform. In the method, the highly viscous polyester melt is subjected to a pre-drying and drying/degassing after a hot cutting method. Hot cutting is implemented at water temperatures of 70° C. to 95° C. and with a liquid to solid ratio of 8 to 12:1.
Claims16
A device directly producing a polyester granulate from a highly viscous polyester melt (hiV) with a polymerisation degree (PG) of 132 to 165, said device comprising a hot cutter, a pre-dryer and a drying and degassing device, wherein the pre-dryer is configured as an agitating centrifuge, and the drying and degassing device is configured in the form of a vertically standing cylindrical container with a temperature-control zone and a cooling zone, said cooling zone having a heat exchanger with a tube bundle configured with machining which is free of dead surfaces on an upper side.
Dependencies are inferred from the claim text.