REFINER STATOR PLATE HAVING AN OUTER ROW OF TEETH SLANTED TO DEFLECT PULP AND METHOD FOR PULP DEFLECTION DURING REFINING

• US 20070205314A1
• Filed: 05/10/2007
• Published: 09/06/2007
• Est. Priority Date: 01/09/2006
• Status: Active Grant

• Current Assignee: Andritz Incorporated
• Original Assignee: Andritz Incorporated
• Inventors: Gingras, Luc
• Granted Patent: US 7,766,269 B2
• Time in Patent Office: Days
• US Class Current: 241/261.300
• CPC Class Codes: D21D 1/006 Disc mills

Abstract

A refiner including: a rotor disc including a rotor plate including concentric rows of rotor teeth; a stator disc arranged opposite to the rotor disc, wherein the stator disc includes a stator plate; the stator plate includes concentric rows of stator teeth intermeshing with the rows of rotor teeth, and the rows of stator teeth include an outer row of stator teeth having leading sidewalls angled to deflect particles flowing between the teeth of the outer row.

Claims

1. A refiner comprising:

a rotor disc including a rotor plate including concentric rows of rotor teeth;

a stator disc opposite to the rotor disc, wherein the stator disc includes a stator plate;

the stator plate includes concentric rows of stator teeth intermeshing with the rows of rotor teeth, and

the rows of stator teeth include an outer row of stator teeth having leading sidewalls angled to deflect particles flowing between the teeth of the outer row.

2. The refiner of claim 1 wherein the refiner is a disperger.

3. The refiner of claim 1 wherein the leading sidewalls form an angle in a range of 10 to 60 degrees with respect to a radial of the plate.

4. The refiner plate of claim 1 wherein the leading sidewalls form an angle in a range of 15 to 45 degrees with respect to a radial of the plate.

5. The refiner plate of claim 1 wherein the leading sidewalls have a surface shape of at least one of:

planar, V-shaped including a radial inward surface and a slanted outward surface, and a curved section.

6. The refiner plate of claim 1 wherein the leading sidewalls have a length including a tangential dimension extending a distance at least equal to a gap between adjacent teeth of the outer stator row.

7. The refiner plate of claim 1 wherein the leading sidewalls each include an angled wall portion and a radially aligned wall portion, wherein the angled wall portion is radially outward of the radially aligned wall portion.

8. The refiner plate of claim 1 wherein the outer row of teeth has substantially perpendicular rear walls.

9. A refiner comprising:

a first disc including a first plate;

a second disc opposite to the first disc and including a second plate comprising teeth intermeshing with teeth on the first plate, and

the teeth on the second plate include teeth each having a leading sidewall angled to deflect particles flowing between the teeth.

10. A refiner as in claim 9 wherein the second disc is a stationary stator disc.

11. A refiner as in claim 9 wherein the teeth with the leading sidewalls are in an outer row of teeth.

12. A method of refining celluosic fiber material between opposing discs in a refiner comprising:

feeding the fiber material to between the discs;

rotating at least one of the discs to propel the fiber material radially outward and between the discs;

refining the refining material by passing the material through rows of intermeshing teeth on the opposing discs; and

deflecting the refining material as the material flows through an outer row of teeth on one of discs, wherein the teeth in the outer row have a leading sidewall angled to deflect pulp material moving radially between the teeth.

13. The method of claim 12 wherein the leading sidewall forms an angle in a range of 10 to 60 degrees with respect to a radial of the plate.

14. The method of claim 12 wherein the leading sidewalls extend a distance along a direction tangent to the outer row and the distance is at least equal to a width of a gap between adjacent teeth of the outer stator row.

15. A method of refining material between opposing discs in a refiner comprising:

feeding the refining material to an inlet of at least one of the discs;

rotating one disc with respect to the other disc while pulp material moves radially outward and between the discs due to centrifugal force;

refining the refining material by passing the material through rows of intermeshing teeth on the opposing discs;

deflecting the refining material as the material flows through an outer row of teeth on one of discs, wherein the teeth in the outer row each have a leading sidewall angled to deflect pulp material moving radially between the teeth.

16. The method of claim 15 wherein the leading sidewall forms an angle in a range of 10 to 60 degrees with respect to a radial of the plate.

17. The method of claim 15 wherein deflecting comprises deflecting pulp moving along a substantially radial path through the outer row of teeth.

18. The method of claim 15 wherein the leading sidewalls extends a distance along a direction tangent the outer row at least equal to a width of a gap between adjacent teeth of the outer stator row.

19. The method of claim 15 wherein deflecting includes deflecting substantially al pulp moving between the teeth in a substantially radial path.

20. The method of claim 15 wherein the other disc is a stationary stator disc.