Conical rotor refiner plate element for counter-rotating refiner having curved bars and serrated leading sidewalls

Patent metadata

Field	Value
Publication number	US-9670615-B2
Application number	US-201213566373-A
Country	US
Kind code	B2
Filing date	Aug 3, 2012
Priority date	Aug 19, 2011
Publication date	Jun 6, 2017
Grant date	Jun 6, 2017

Abstract

A refining plate segment for a mechanical refiner of lignocellulosic material including: a convex conical refining surface on a convex conical substrate of the plate, wherein the refining surface is adapted to face a concave conical refining surface of an opposing refiner plate, the convex conical refining surface including bars and grooves formed between adjacent bars, wherein an angle of each bar with respect to a reference line parallel to a rotational axis of the refiner increases at least 15 degrees and the angle is a holdback angle is 10 to 45 degrees at a periphery of the refining surface, and wherein the bars each include a leading sidewall having an irregular surface having protrusions extending outwardly from the sidewall toward a sidewall on an adjacent bar.

First claim

What is claimed is:

1. A refining plate segment for a conical mechanical refiner of lignocellulosic material comprising:
a substrate having a surface, the surface being convex in a cross section, the cross section extending from one side of the refining plate segment to an opposite side of the refining plate segment,
bars extend from the surface of the substrate, and
grooves formed between adjacent ones of the bars;
wherein the bars and grooves extend along the surface of the substrate to an outer edge of the substrate;
each bar forms an angle with respect to a reference line parallel to a side edge of the refiner plate segment, wherein the angle increases at least 15 degrees along a length of each of the bars, and the angle at an outer end of each of the bars is in a range of 10 to 20 degrees, and
wherein the bars each include a leading sidewall having an irregular surface, wherein the irregular surface includes protrusions extending outwardly from the sidewall toward a sidewall on an adjacent one of the bars, and the irregular surface extends from at or near the outer edge of the substrate and extends inward along each of the bars.

2. The refining plate segment of claim 1 wherein the bars each have a curved longitudinal shape.

3. The refining plate segment of claim 1 wherein the angle increases continuously and gradually along each of the bars.

4. The refining plate segment of claim 1 wherein the angle increases in steps.

5. The refining plate segment of claim 1 wherein the angle of each of the bars at an inlet end of the bars is no greater than 20 degrees.

6. The refining plate segment of claim 1 wherein the refining plate segment is adapted to be assembled with additional refining plate segments to form a rotating refining cone.

7. The refining plate segment of claim 1 wherein the bars and grooves are arranged in multiple refining zones, wherein the bars and grooves of a first refining zone are wider than the bars and grooves of a second refining zone, and wherein the second refining zone is outward on the refining plate segment from the first refining zone.

8. The refining plate segment of claim 7 wherein the angle refers to the bars of the second refining zone.

9. The refining plate segment of claim 1 wherein the irregular surface includes a series of ramps, each having a lower edge at the surface of the substrate and extends at least partially up the leading sidewall.

10. The refining plate segment of claim 1 wherein the irregular surface extends along a length of each of the bars without reaching the inlet of the bars.

11. The refining plate segment of claim 1 wherein the irregular surface is along a outward portion of the leading sidewalls of the bars and the leading sidewalls of the bars include a smooth surface along an inward portion of the bars, and
wherein the angle of the bars with respect to the reference line remains within a range zero to fifteen degrees along the entire length of the inward portion of the bars.

12. The refining plate segment of claim 1 wherein the bars are arranged in groups of at least three bars, and
in each of the groups, the bars extend from a first bar to a last bar in a direction opposite to a rotational direction of the mechanical refiner, and
in each of the groups, the irregular surface of each of bars extends further inwardly than does the next bar in the group in the direction opposite to a direction of rotation of the refining plate segment, except for the last bar in the group that has the irregular surface extending further inwardly than the other bars of the group.

13. The refining plate of claim 1 wherein an angle between the reference line and an innermost region of the irregular surface on the leading sidewalls of each of the bars is in a range zero to ten degrees.

14. A refiner plate segment for a mechanical refiner of lignocellulosic material comprising:
a substrate having a surface with a convex shape in a cross section extending from one side of the refiner plate to an opposite side of the refiner plate, and the refiner plate segment is adapted to face an opposing refiner plate segment having a concave shape in a cross section, and
bars extending from the surface of the substrate and grooves between the bars, wherein the bars each have an inlet end and an outlet end, and each bar at the outlet end forms an angle in a range of any of 10 to 20 degrees with respect to a reference line parallel to a side edge of the refiner plate segment,
wherein the bars each include a leading sidewall having an irregular surface, wherein the irregular surface includes protrusions extending outwardly from the leading sidewall toward a sidewall on an adjacent one of the bars and the irregular surface extends from at or near the outlet end of each of the bars and extends radially inwardly along the bar.

15. The refining plate of claim 14 wherein the bars each have a curved longitudinal shape.

16. The refining plate segment of claim 14 wherein the angle increases continuously and gradually along the bars.

17. The refining plate segment of claim 14 wherein the angle increases in steps along the bars.

18. The refining plate segment of claim 14 wherein the angle is no greater than 20 degrees at the inlet end of the bars.

19. The refining plate segment of claim 14 wherein the refining plate segment is adapted to be assembled with other refining plates segments to form a rotating refining cone.

20. The refiner plate segment of claim 14 wherein the protrusions of the irregular surface form a pattern that is at least one of a zig-zag, sawtooth, series of bumps, sinusoid, or a sideways Z-pattern.

21. The refiner plate segment of claim 14 wherein the protrusions on the irregular surface vary the width of each of the bars by at least one-fifth the width of the bar along the portion of the bar having the sidewall with the irregular surface.

22. The refining plate segment of claim 14 wherein the protrusions of the irregular surface are most pronounced at an upper edge of the sidewall and are less pronounced proximate a substrate of the plate.

23. The refining plate segment of claim 14 wherein the bars and grooves are arranged in multiple refining zones, wherein the bars and grooves in a first refining zone are wider than the bars and grooves in and a second refining zone, and wherein the second refining zone is outward on the refining plate segment from the first refining zone.

24. The refining plate of claim 23 wherein the angle refers to the bars of the second refining zone.

25. The refining plate of claim 14 wherein the irregular surface includes a series of ramps each having a lower edge at the substrate of each groove, extending at least partially up the leading sidewall.

26. The refining plate of claim 14 wherein the irregular surface extends along each of the bars without reaching an inlet to the bar.

27. The refining plate segment of claim 14 wherein the irregular surface is along an outward portion of the leading sidewalls of the bars and the leading sidewalls of the bars include a smooth surface along an inward portion of the bars, and
wherein an angle of the bars with respect to the reference line remains within a range zero to fifteen degrees along the entire length of the inward portion of the bars.

28. The refining plate segment of claim 14 wherein the bars are arranged in groups of three

Assignees

• Gingras Luc
• Andritz Inc

Inventors

• Gingras Luc

Classifications

• D21D1/24 Primary

  Jordan rolls · CPC title

• B02C7/02

  with coaxial discs · CPC title

• D21D1/306

  Discs · CPC title