REFINER PLATE WITH GRADUALLY CHANGING GEOMETRY

• US 20140077016A1
• Filed: 09/05/2013
• Published: 03/20/2014
• Est. Priority Date: 09/17/2012
• Status: Active Grant

• Current Assignee: Andritz Incorporated
• Original Assignee: Andritz Incorporated
• Inventors: GINGRAS, Luc
• Granted Patent: US 9,968,938 B2
• Time in Patent Office: Days
• US Class Current: 241/298
• CPC Class Codes: B02C 7/12 Shape or construction of discs
• CPC Class Codes: D21D 1/306 Discs

Abstract

A refiner plate segment with a continuous transition zone spanning from the periphery or near the periphery of the plate in a substantial spiral toward the axis of rotation of the plate adjacent the breaker bar zone.

Claims

1. A pattern for a refiner plate segment or sector for mounting on a refiner disc, comprising:

an outer radius at an outer periphery and an inner radius at an inner arc;

a refining zone comprising a pattern of bars and grooves disposed between the outer periphery and inner arc in multiple bands, wherein the patterns of bars in each band have a density, and wherein the density of the bars in each band is greater from the zone nearest the inner arc to the zone nearest the outer periphery, and

a transition zone distributed in a line forming a substantially spiral shape spanning the refining zone of the refiner plate mounted with refiner plate segments from approximately the outer periphery to approximately the inner arc of the refining zone, and wherein the transition zone is arranged at an angle relative to a radial line passing through the segment of between 20° and

85°

.

2. The refiner plate segment of claim 1, wherein the pattern of bars and grooves becomes denser within a refining zone band moving from the portion of the refining zone nearest the inner arc to the portion of the refining zone nearest the outer periphery.

3. The pattern for a refiner plate segment of claim 1, wherein the transition zone comprises one or more of the following:

a full surface dam, a subsurface dam connecting the ends of bars from each zone, connected and partially connected bar ends, or a distinct break between transition zones.

4. The pattern for a refiner plate segment of claim 2, wherein the transition zone comprises one or more of the following:

a full surface dam, a subsurface dam connecting the ends of bars from each zone, connected and partially connected bar ends, or a distinct break between transition zones.

5. The pattern for a refiner plate segment of claim 2, wherein the transition zone is arranged at an angle relative to a radial line passing through the segment of between 30°

and 80°

.

6. The pattern for a refiner plate segment of claim 2, wherein the transition zone is distributed in a combination of lines forming the substantially spiral shape spanning the refining zone of the refiner plate mounted with refiner plate segments from approximately the outer radius to approximately the inner arc.

7. The pattern for a refiner plate segment of claim 2, wherein the transition zone is distributed in a curve forming a substantially spiral shape spanning at least 50% of the surface of the refining zone of the refiner plate.

8. The pattern for a refiner plate segment of claim 2, wherein the transition zone is distributed in a curve forming a substantially spiral shape spanning at least 60% of the surface of the refining zone of the refiner plate.

9. The pattern for a refiner plate segment of claim 2, wherein the transition zone is distributed in a curve forming a substantially spiral shape spanning at least 75% of the surface of the refining zone of the refiner plate.

10. The pattern for a refiner plate segment of claim 6, wherein the transition zone is distributed in a curve forming a substantially spiral shape spanning at least 50% of the surface of the refining zone of the refiner plate.

11. The pattern for a refiner plate segment of claim 6, wherein the transition zone is distributed in a curve forming a substantially spiral shape spanning at least 60% of the surface of the refining zone of the refiner plate.

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

13. The pattern for a refiner plate of claim 8, where the continuous transition zone has one or many discontinuities in the pattern of bars and grooves that amount to less than 10% of the surface area of the refining zone.

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

15. The refiner plate segment of claim 1, wherein the refining zone is mirrored along the central axis of the refiner plate segment, and wherein the transition zone spans substantially all of the surface of the refining zone, and the transition zone is substantially shaped like a “

V,”

a “

W,”

an inverted “

V,”

or an inverted “

W.”

16. The refiner plate segment of claim 1, wherein the refining area comprises the area of the refiner plate segment spanning from the end of the breaker bar section closest the outer periphery to the outer periphery of the refining zone.

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

20. The refiner plate segment of claim 2, wherein the transition zone is in the form of a V shape or an inverted V shape.

17. A refiner plate segment comprising a refining zone having a pattern of bars and grooves and a continuous transition zone in the form of an X, wherein diamond shapes are created within the refining zone by the X shapes created by the transition zones, and wherein the density of bars in the pattern of bars and grooves within each diamond shape becomes greater more dense moving radially from a diamond shape nearer to an inner arc to a diamond shape further from the inner arc.

18. A refiner plate segment comprising a refining zone having a pattern of bars and grooves and a transition zone within the refining zone, wherein the refining zone and the transition zone form spiral bands, and wherein one or more bars span across two or more transition zones, and wherein the pattern of bars gets denser when crossing the transition zone in a direction from the inner arc toward the outer periphery.

21. The refiner plate segment of claim 18 having a first lateral edge and a second lateral edge, wherein the first lateral edge is closest to the inner arc of the segment, and the second lateral edge is closest to the outer arc of the segment, and wherein the pattern of bars gets denser moving in a direction from the first lateral edge to the second lateral edge.