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Refiner plate with gradually changing geometry

  • US 10,675,630 B2
  • Filed: 03/26/2018
  • Issued: 06/09/2020
  • Est. Priority Date: 09/17/2012
  • Status: Active Grant
First Claim
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1. A refiner plate segment comprising:

  • an outer periphery;

    an inner arc distally disposed from the outer periphery;

    a first lateral edge;

    a second lateral edge distally disposed from the first lateral edge; and

    a refining surface disposed between the outer periphery and the inner arc comprising;

    a pattern of bars and grooves disposed between the outer periphery and the inner arc in multiple bands, wherein the pattern of bars and grooves in each band of the multiple bands has a density, wherein each bar has ends,wherein the pattern of bars and grooves in a first band of the multiple bands disposed closer to the inner arc has a lesser density than a pattern of bars and grooves in an adjacent band of the multiple bands disposed closer to the outer periphery as measured along a radial line configured to extend from a center of rotation of the refiner plate segment when the refiner plate segment is mounted to a mechanical refiner; and

    a transition zone, wherein the transition zone is arranged at an angle of between 20° and

    85°

    relative to the radial line, wherein the transition zone borders a side of at least one of the multiple bands, wherein the density of the pattern of bars and grooves increases within a band of the multiple bands as measured from a point on the band nearer the inner arc to a point on the band nearer the outer periphery, and wherein the transition zone is distributed across the refining surface.

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