Fiber blend, method for producing fiber blend, and paperboard product comprising fiber blend

Patent metadata

Field	Value
Publication number	US-10961659-B2
Application number	US-201916535749-A
Country	US
Kind code	B2
Filing date	Aug 8, 2019
Priority date	Aug 10, 2018
Publication date	Mar 30, 2021
Grant date	Mar 30, 2021

Abstract

A fiber blend includes a first amount of wood pulp fibers refined in an amount of at least about 150 kWh per metric ton of gross refining energy, and a second amount of wood pulp fibers refined in an amount of at most about 10 kWh per metric ton of gross refining energy.

First claim

What is claimed is:

1. A method for producing a fiber blend comprising:
refining a first stream of wood pulp fibers in an amount of at least about 150 kWh per metric ton of gross refining energy;
refining a second stream of wood pulp fibers in an amount of at most about 10 kWh per metric ton of gross refining energy; and
blending the first stream of wood pulp fibers and the second stream of wood pulp fibers.

2. The method of claim 1 wherein the second stream of wood pulp fibers is unrefined.

3. The method of claim 1 further comprising separating a common stream of wood pulp fibers into the first stream of wood pulp fibers and the second stream of wood pulp fibers.

4. The method of claim 1 wherein the first stream of wood pulp fibers is blended in an amount of at least about 5% by volume of the total volume of the blended stream.

5. The method of claim 1 wherein the first stream of wood pulp fibers is blended in an amount of at most about 40% by volume of the total volume of the blended stream.

6. The method of claim 1 wherein the second stream of wood pulp fibers is blended in an amount of at least about 60% by volume of the total volume of the blended stream.

7. The method of claim 1 wherein the second stream of wood pulp fibers is blended in an amount of at most about 95% by volume of the total volume of the blended stream.

8. The method of claim 1 wherein the first stream of wood pulp fibers is refined in a range of about 150 to about 2000 kWh per metric ton of gross refining energy.

9. The method of claim 1 wherein the first stream of wood pulp fibers is refined in a range of about 200 to about 1500 kWh per metric ton of gross refining energy.

10. The method of claim 1 wherein the first stream of wood pulp fibers is refined in a range of about 200 to about 1000 kWh per metric ton of gross refining energy.

11. The method of claim 1 wherein the second stream of wood pulp fibers is refined in an amount of at most about 5 kWh per metric ton of gross refining energy.

12. The method of claim 1 wherein the second stream of wood pulp fibers is refined in an amount of at most about 2 kWh per metric ton of gross refining energy.

13. The method of claim 1 wherein the first stream of wood pulp fibers includes at least one of hardwood fibers, softwood fibers, and recycled fibers.

14. The method of claim 1 wherein the second stream of wood pulp fibers includes at least one of hardwood fibers, softwood fibers, and recycled fibers.

15. The method of claim 1 wherein the first stream of wood pulp fibers is produced by chemical pulping.

16. The method of claim 1 wherein the second stream of wood pulp fibers is produced by chemical pulping.

17. The method of claim 1 wherein the first stream of wood pulp fibers is refined by a continuous disc refiner.

18. The method of claim 1 further comprising processing the blended first and second streams of wood pulp fibers into a paperboard product.

19. The method of claim 18 wherein the paperboard product has a caliper thickness of about 8 to about 30 point.

20. The method of claim 18 wherein the paperboard product is included in at least one of a beverage board, a liner board, and a corrugated medium.

21. The method of claim 18 wherein the paperboard product is at least one layer of a multi-ply liner board that comprises an unbleached paperboard layer and a bleached paperboard layer.

Assignees

• Westrock Mwv Llc

Inventors

• Moynihan Humphrey J
• Hart Peter W
• Kilgore Nichole
• Dejarnette John D

Classifications

• D21H11/10

  Mixtures of chemical and mechanical pulp · CPC title

• D21D99/00

  Subject matter not provided for in other groups of this subclass · CPC title

• D21D1/20 Primary

  Methods of refining · CPC title

• D21H11/08

  Mechanical or thermomechanical pulp · CPC title

• D21D1/00 Primary

  Methods of beating or refining; Beaters of the Hollander type (knotter screens D21F) · CPC title