Refiner plate with gradually changing geometry

Patent metadata

Field	Value
Publication number	US-9968938-B2
Application number	US-201314019146-A
Country	US
Kind code	B2
Filing date	Sep 5, 2013
Priority date	Sep 17, 2012
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

The present disclosure describes a refiner plate segment with one or more continuous, generally spiraling transition zones. A transition zone spans from an area near the inner portion of the plate, near the breaker bar area, and extends toward an area near the periphery of the plate at an angle. A tangent line to the transition zone intersecting a radial line forms this angle. The radial line is formed by a line perpendicular to the outer periphery passing through the center point of the center of plate rotation.

First claim

What is claimed is:

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 each of the multiple bands, wherein the density of the pattern of bars and grooves increases within each of the multiple bands as measured from a point on each multiple band nearer the inner arc to a point on each multiple band nearer the outer periphery, and wherein the transition zone is distributed in a continuous curved line or a continuous straight line across a structure selected from the group consisting of: a full surface dam, a subsurface dam, dams connecting at least some of the ends of the bars in the first band to at least some of the bars in the adjacent band, and Y-junctions connecting bars between the first band and the adjacent band.

2. The refiner plate segment of claim 1 , wherein the transition zone is arranged at an angle of between 30° and 80° relative to the radial line.

3. The refiner plate segment of claim 1 , wherein the transition zone is configured to align with a transition zone of an adjacent refiner plate segment to thereby form a spiral shape spanning a refining surface of a refiner plate assembly, wherein the refiner plate assembly comprises two or more refiner plate segments.

4. The refiner plate segment of claim 1 , wherein the transition zone is distributed in a curve forming a spiral shape spanning at least 50% of the refining surface.

5. The refiner plate segment of claim 1 , wherein the transition zone is distributed in a curve forming a spiral shape spanning at least 60% of the refining surface of a refiner plate.

6. The refiner plate segment of claim 1 , wherein the transition zone is distributed in a curve forming a spiral shape spanning at least 75% of the refining surface.

7. The refiner plate segment of claim 3 , wherein the transition zone is distributed in a curve forming a spiral shape spanning at least 50% of the refining surface of the refiner plate assembly.

8. The refiner plate segment of claim 3 , wherein the transition zone is distributed in a curve forming a spiral shape spanning at least 60% of the refining surface of the refiner plate assembly.

9. The refiner plate segment of claim 3 , wherein the transition zone is distributed in a curve forming a spiral shape spanning at least 75% of the refining surface of the refiner plate assembly.

10. The refiner plate of claim 5 , wherein the transition zone has one or more discontinuities in the pattern of bars and grooves, the discontinuities amounting to less than 10% of the refining surface.

11. The refiner plate segment of claim 1 , wherein the transition zone is radially distributed on at least 50% of the refining surface.

12. The refiner plate segment of claim 1 , wherein the refining surface is mirrored along a central axis of the refiner plate segment, wherein the transition zone spans the refining surface, and wherein the transition zone is shaped like a “V,” a “W,” an inverted “V,” or an inverted “W.”

13. The refiner plate segment of claim 1 , wherein the refining surface is disposed radially outward of a breaker bar section, wherein the breaker bar section is a first refining zone disposed closest to the inner arc of the refiner plate segment.

14. A refiner plate segment comprising:
a refining zone having a pattern of bars and grooves wherein each bar has ends; and
transition zones disposed on the refining zone to create X shapes,
wherein diamond shapes are created in the refining zone by the X shapes created by the transition zones, and
wherein a density of bars in the pattern of bars and grooves within each diamond shape increases radially from a first diamond shape nearer to an inner arc to an adjacent diamond shape further from the inner arc, wherein the transition zone is distributed in a continuous curved line or a continuous straight line across a structure selected from the group consisting of: a full surface dam, a subsurface dam, subsurface dams connecting at least some of the ends of the bars in the first diamond shape to at least some of the bars in the adjacent diamond shape, and Y-junctions connecting bars between the first diamond shape and the adjacent diamond shape.

15. A refiner plate segment comprising:
an outer periphery;
an inner arc disposed across from the outer periphery;
a first lateral edge;
a second lateral edge disposed across from the first lateral edge; and
a refining surface having a pattern of bars and grooves, wherein the refining surface is disposed between the inner arc and the outer periphery, the refining surface comprising:
multiple transition zones, wherein the transition zones are parallelly disposed to adjacent transition zones, wherein each transition zone is distributed in a line across a structure selected from the group consisting of: a full surface dam, a subsurface dam, dams connecting at least some of the ends of the bars in the first band to at least some of the bars in the adjacent band, and Y-junctions connecting bars between the first band and the adjacent band, wherein the line spans the refining surface at an angle of between 20° and 85° relative to a radial line passing through the refiner plate segment, wherein the radial line is configured to extend from a center of rotation of the refiner plate segment when the refiner plate segment is mounted to a mechanical refiner,
wherein an area between adjacent transition zones forms a spiral band,
wherein multiple adjacent transition zones form multiple spiral bands,
wherein one or more bars span across two or more transition zones,
wherein the pattern of bars has a density,
wherein the transition zone is defined by an increase in density between a first spiral band of the multiple spiral bands disposed closer to the inner arc and an adjacent spiral band of the multiple spiral bands disposed further from the inner arc, and
wherein the density increases within the multiple spiral bands from a point of each spiral band disposed closer to the first lateral edge to a point of the spiral band disposed closer to the second lateral edge.

16. The refiner plate segment of claim 1 , wherein the transition zone is in a form of a V shape or an inverted V shape.

17. The refiner plate segment of claim 15 further comprising a first lateral edge and a second lateral edge, wherein the first lateral corner is defined by a junction of the first lateral edge and the inner arc, and the second lateral corner is defined by a junction of the second lateral edge and the outer periphery, and wherein the density of the pattern of bars increases from the first latera

Assignees

• Andritz Inc

Inventors

• Gingras Luc

Classifications

• B02C7/12 Primary

  Shape or construction of discs · CPC title

• D21D1/306 Primary

  Discs · CPC title

• D21D1/30

  Disc mills · CPC title

• D21D1/20 Primary

  Methods of refining · CPC title