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Refiner control

  • US 6,935,164 B2
  • Filed: 06/27/2001
  • Issued: 08/30/2005
  • Est. Priority Date: 07/14/2000
  • Status: Expired due to Fees
First Claim
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1. A pulp refiner control method, comprising:

  • emitting a controllable acoustic signal into a pulp fluid for interaction of the controllable acoustic signal with fibers in the pulp fluid;

    tuning the controllable acoustic signal to characteristic frequencies of the fibers;

    measuring acoustic signals from the pulp fluid, the measuring comprising measuring at least one spectral component resulting from the interaction of the controllable acoustic signal and the fibers;

    determining at least one process control parameter based on the measured acoustic signals; and

    controlling a refiner process treating the pulp fluid.

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