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Method for pulp quality control and regulation

  • US 5,076,890 A
  • Filed: 02/27/1990
  • Issued: 12/31/1991
  • Est. Priority Date: 03/16/1989
  • Status: Expired due to Fees
First Claim
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1. A method for control of the consistency of a slurry or pulp fluid material proceeding from a sedimentation zone or thickener tank, comprising establishing a reference displacement time for a known volume of said fluid moving under a constant force or head load through a known distance, the displacement time being representative of a desired average state of consistency of said fluid volume, thereafter passing a known volume of said fluid under a constant head through said known distance, measuring the an actual displacement time of said volume of fluid consumed in moving through said known distance, calculating the difference between said reference displacement time and the measured actual displacement time, and adjusting the volume of moving fluid or the prior physical conditioning or elaboration of said fluid material to maintain or restore the desired average state of consistency.

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