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Device for degassing polymer melts

  • US 9,975,278 B2
  • Filed: 12/05/2013
  • Issued: 05/22/2018
  • Est. Priority Date: 01/10/2013
  • Status: Active Grant
First Claim
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1. A device for degassing polymer melts comprising:

  • a plasticising unit,at least one vacuum region associated with the plasticising unit,the at least one vacuum region being connected to a vacuum system via a vacuum line or degassing line via at least one vacuum separator, the at least one vacuum separator comprising a vacuum separator housing having a gas inlet and a gas outlet, the gas inlet being at least indirectly connected to the vacuum region and the gas outlet being at least indirectly connected to the vacuum system, the at least one vacuum separator forming a first filter stage, the first filter stage being connected to a second filter stage having at least one filter, the second filter stage being connected to and upstream of the vacuum system,at least one first valve located between the at least one vacuum region and the at least one vacuum separator, such that the at least one first valve is connected upstream of the at least one vacuum separator, the at least one first valve being configured to move between an open position and a closed position, andat least one pressure sensor located between the first filter stage and the second filter stage, the at least one pressure sensor measuring a pressure between the first filter stage and the second filter stage, wherein;

    the at least one vacuum separator comprises cooling tubes which extend in parallel with one another in the container inner chamber of the vacuum separator housing,the cooling tubes have a double-wall design and comprise an outer tube, in which an inner tube extends, thereby forming a space, in such a way that coolant flows into the space between the outer tube and the inner tube via an outer tube supply line, and such that, inside the outer tube, said coolant can be recirculated into the inner tube via a remote circulation connection, and from there, in the opposite direction, to a coolant outlet, or vice versa,the cooling tubes terminate at a spacing above a collection chamber or above the container floor of the vacuum separator housing,a cleaning device comprises a scraper or a wiper, the cleaning device being adapted to the cross-sectional shape of the cooling tubes and being movable at least in one partial vertical portion as far as to the bottom end of the cooling tubes, anda control device is configured to drive the cleaning device based on the pressure measured by the at least one pressure sensor between the first filter stage and the second filter stage.

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