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Refiner control

  • US 20040022128A1
  • Filed: 06/17/2003
  • Published: 02/05/2004
  • Est. Priority Date: 07/14/2000
  • Status: Active Grant
First Claim
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1. A pulp refiner control method, comprising the step of:

  • measuring acoustic signals (22) from a pulp fluid (10), characterised by the further steps of;

    emitting controllable acoustic signal into said pulp fluid (10) for interaction of said controllable acoustic signal (18) with fibres (12) in said pulp (10), being responsive to acoustic signals;

    whereby said step of measuring of acoustic signals (22) comprises measuring of at least one spectral component resulting from said interaction of said controllable acoustic signal (18) and said fibres (12);

    determining at least one process control parameter based on said measured acoustic signals (22); and

    controlling a refiner process treating said pulp fluid (10).

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