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Multiple sensor resin delivery optimizing vacuum pump operation

  • US 10,414,083 B2
  • Filed: 12/13/2017
  • Issued: 09/17/2019
  • Est. Priority Date: 02/20/2014
  • Status: Active Grant
First Claim
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1. A method for a pneumatically conveying plastic resin material from a resin supply using a vacuum pump having a suction intake, comprising:

  • a) providing a plurality of receivers for temporarily storing resin material until needed by an associated process machine;

    b) providing a conduit for conveying granular resin material from the resin supply to the receivers in response to vacuum drawn through the conduit by the vacuum pump;

    c) periodically and serially sensing vacuum level at at least some of the receivers;

    d) storing the sensed vacuum levels;

    e) actuating the vacuum pump;

    f) adjusting vacuum pump speed based on the stored vacuum levels.

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