Apparatus and method for processing wood fibers

Patent metadata

Field	Value
Publication number	US-11905658-B2
Application number	US-202017064383-A
Country	US
Kind code	B2
Filing date	Oct 6, 2020
Priority date	Jan 2, 2018
Publication date	Feb 20, 2024
Grant date	Feb 20, 2024

Abstract

A refining member for a pulp refiner comprising a refining body with a refining surface comprising refiner bars separated by refiner grooves and teeth. Each of the refiner bars extend from a radially inward position on the refining surface to a first radially outward position on the refining surface, and the teeth extend to a second radially outward position on the refining surface. The second radially outward position is nearer to an outermost part of the refining body than the first radially outward position. The refiner bars are adapted to refine wood fibers, and the teeth are adapted to break up fiber bundles.

First claim

What is claimed is:

1. A refining member for a pulp refiner, the refining member comprising:
a disc-shaped refining body including a planar refining surface comprising:
refiner bars projecting outwardly from the planar refining surface and forming refiner grooves therebetween, each of the refiner bars extending from a radially inward position on the planar refining surface to a radially outward position on the planar refining surface; and
teeth projecting outwardly from the planar refining surface, the teeth being spaced apart from the radial outer edge of the refiner bars by a substantially planar area,

wherein the refiner bars are adapted to refine wood fibers and the teeth are adapted to break up fiber bundles.

2. The refining member of claim 1 , wherein the refiner bars have a first maximum height, when measured from a floor of an adjacent refiner groove, from about 4 mm to about 10 mm.

3. The refining member of claim 1 , wherein the refiner bars have a width extending between side edges of from about 2 mm to about 8 mm.

4. The refining member of claim 1 , wherein at least a portion of the refiner grooves are provided with dams.

5. The refining member of claim 1 , wherein each refiner groove has a floor that extends continuously from the radially inward position to the radially outward position.

6. The refining member of claim 1 , wherein each refiner bar extends continuously from the radially inward position to the radially outward position.

7. The refining member of claim 1 , wherein the teeth project to a greater height from the planar refining surface than the refiner bars.

8. The refining member of claim 1 , wherein the substantially planar area is a circumferentially continuous annular area of the planar refining surface.

9. A pulp refiner comprising:
a frame;
at least a first pair of refining members comprising:
a first refining member associated with the frame and comprising a first disc-shaped refining body including a first planar refining surface comprising: first refiner bars projecting outwardly from the first planar refining surface and forming first refiner grooves therebetween, each of the first refiner bars extending from a radially inward position on the first planar refining surface to a radially outward position on the first planar refining surface, and first projecting outwardly from the first planar refining surface, the first teeth being spaced apart from the radial outer edge of the first refiner bars by a substantially planar area; and
a second refining member associated with the frame and comprising a second disc-shaped refining body including a second planar refining surface comprising: second refiner bars projecting outwardly from the second planar refining surface and forming second refiner grooves therebetween, each of the second refiner bars extending from a radially inward position on the second planar refining surface to a radially outward position on the second planar refining surface, and second teeth projecting outwardly from the second planar refining surface, the second teeth being spaced apart from the radial outer edge of the second refiner bars by a substantially planar area,
wherein the frame is configured to position the first refining member coaxial with the second refining member with the first planar refining surface facing and spaced axially away from the second planar refining surface to define a refining space therebetween; and

a rotor associated with the frame and coupled to one of the first refining member or the second refining member such that rotation of the rotor effects movement of the first and second refining members relative to one another; and
wherein when a slurry of wood pulp comprising wood fibers is supplied to the frame, the wood pulp slurry passes through the refining space such that a significant number of the wood fibers in the wood pulp slurry are refined and a plurality of wood fiber bundles in the wood pulp slurry are separated.

10. The pulp refiner of claim 9 , wherein the second teeth are arranged in a first annular row and a second annular row positioned radially outward from the first annular row on the second planar refining surface.

11. The pulp refiner of claim 10 , wherein when the first refining member is positioned coaxial with the second refining member, the first teeth are arranged in an annular row on the first planar refining surface at a radial distance corresponding to a radial position on the second planar refining surface between the radial positions of the first and second annular rows of the second teeth, and wherein the first teeth intermesh with the second teeth.

12. The pulp refiner of claim 10 , wherein first annular row of the second teeth is spaced apart from the second annular row of the second teeth by a circumferentially continuous annular area of the second planar refining surface.

13. The pulp refiner of claim 9 , wherein the first refining member is a non-rotating stator member and the second refining member is a rotating rotor member.

14. The pulp refiner of claim 9 , wherein when the first refining member is positioned coaxial with the second refining member, each first refiner bar is positioned opposite a corresponding second refiner bar along substantially an entirety of a respective longitudinal length of the first and second refiner bars.

15. The pulp refiner of claim 9 , wherein each first refiner groove has a first floor that extends continuously from the radially inward position to the radially outward position on the first planar refining surface, and wherein each second refiner groove has a second floor that extends continuously from the radially inward position to the radially outward position on the second planar refining surface.

16. The pulp refiner of claim 9 , wherein each first refiner bar extends continuously from the radially inward position to the radially outward position on the first planar refining surface, and wherein each second refiner bar extends continuously from the radially inward position to the radially outward position on the second planar refining surface.

17. The pulp refiner of claim 9 , wherein the first teeth project to a greater height from the first planar refining surface than the first refiner bars, and wherein the second teeth project to a greater height from the second planar refining surface than the second refiner bars.

18. A refining member for a pulp refiner, the refining member comprising:
a disc-shaped refining body including a planar refining surface comprising:
refiner bars projecting outwardly from the planar refining surface to a first height, each of the refiner bars extending from a radially inward position on the planar refining surface to a radially outward position on the planar refining surface; and
teeth projecting outwardly from the planar refining surface to a second height greater than the first height, the teeth being spaced apart from the radial outer edge of the refiner bars by a substantially planar area,

wherein the refiner bars are adapted to refine wood fibers and the teeth are adapted to break up fiber bundles.

19. The refining member of claim 18 , wherein each refiner bar extends continuously from the radially inward position to the radially outward position.

Assignees

• Int Paper Co

Inventors

• Anderson Dwight Edward

Classifications

• D21D1/303 Primary

  Double disc mills · CPC title

• D21D1/008

  Discs · CPC title

• D21D1/306 Primary

  Discs · CPC title