High softness, high durability bath tissue incorporating high lignin eucalyptus fiber

Patent metadata

Field	Value
Publication number	US-10196780-B2
Application number	US-201715622098-A
Country	US
Kind code	B2
Filing date	Jun 14, 2017
Priority date	Jul 28, 2011
Publication date	Feb 5, 2019
Grant date	Feb 5, 2019

Abstract

A cellulosic tissue includes cellulosic fibers that include at least one of (a) chemically pulped fibers and (b) mechanically pulped fibers. The cellulosic fibers include (i) a percentage by weight of eucalyptus fibers, and (ii) a percentage by weight of regenerated cellulosic microfibers. The cellulosic tissue further includes virgin chemically pulped fibers, with a percentage by weight of recycle fibers. The eucalyptus fibers have been prepared from eucalyptus chips by alkaline peroxide mechanical pulping, exhibiting an ISO brightness of at least 0.82×(% VCP)+0.795×(% RF) 0.98 +0.84×(% APMP), in which % VCP is the percentage of virgin chemical pulp in the tissue, % RF, the percentage of recycle fiber, and % alkaline peroxide mechanical pulping (APMP), the percentage of APMP eucalyptus.

First claim

We claim:

1. A cellulosic tissue comprising:
(A) cellulosic fibers that include at least one of (a) chemically pulped fibers and (b) mechanically pulped fibers, wherein the cellulosic fibers include:
(i) a percentage by weight of eucalyptus fibers; and
(ii) a percentage by weight of regenerated cellulosic microfibers; and

(B) virgin chemically pulped fibers, with a percentage by weight of recycle fiber,
wherein the eucalyptus fibers have been prepared from eucalyptus chips by alkaline peroxide mechanical pulping, exhibiting an ISO brightness of at least 0.82×(% VCP)+0.795×(% RF)0.98+0.84×(% APMP), and
wherein % VCP is the percentage of virgin chemical pulp in the tissue, % RF, the percentage of recycle fiber, and % alkaline peroxide mechanical pulping (APMP), the percentage of APMP eucalyptus.

2. The cellulosic tissue of claim 1 , wherein the eucalyptus fibers have a lignin content of at least about 23%, and exhibit an ISO brightness of at least about 82.

3. The cellulosic tissue of claim 1 , wherein the chemically pulped fibers are selected from a group consisting of hardwood and softwood fibers.

4. The cellulosic tissue of claim 3 , wherein the weight percentage of chemically pulped softwood fibers in the tissue is at most 30%.

5. The cellulosic tissue of claim 1 , wherein the weight percentage of the chemically pulped fibers in the tissue is at most 30%.

6. The cellulosic tissue of claim 1 , wherein the chemically pulped fibers include softwood fibers, and the weight percentage of chemically pulped softwood fibers in the tissue is at most 30%.

7. The cellulosic tissue of claim 1 , wherein the tissue exhibits a machine direction (MD) stretch of between about 20% and about 30%.

8. A method of manufacturing a tissue product, the method comprising:
(A) providing a cellulosic furnish comprising a percentage by weight of cellulosic papermaking fibers that include (a) chemically pulped fibers and (b) mechanically pulped fibers, wherein the cellulosic papermaking fibers include (i) a percentage by weight of regenerated cellulosic microfibers, and (ii) a percentage by weight of eucalyptus fibers, and have an ISO brightness of at least about 84, a Canadian Standard Freeness (CSF) of at least about 400 ml, a bulk of between 2.2 and 4.2 cc/g, and a breaking length of between about 1.2 and 4.7 km;
(B) depositing the cellulosic furnish on a translating foraminous support to form an aqueous web of cellulosic fibers;
(C) removing the aqueous web of fibers from the support to provide a removed web; and
(D) thereafter, dewatering and drying the removed web to form the tissue product.

9. The method of claim 8 , wherein the tissue product exhibits a machine direction (MD) stretch of between about 20% and about 30%.

10. The method of claim 8 , wherein the chemically pulped fibers are selected from a group consisting of hardwood and softwood fibers.

11. The method of claim 10 , wherein the weight percentage of chemically pulped softwood fibers in the tissue is at most 30%.

12. The method of claim 8 , wherein the eucalyptus fibers have been prepared from eucalyptus chips by alkaline peroxide mechanical pulping.

13. The method of claim 8 , wherein the eucalyptus fibers have been prepared from eucalyptus chips by pre-conditioning refiner chemical alkaline peroxide mechanical pulping.

14. A cellulosic tissue comprising:
a percentage by weight of cellulosic papermaking fibers that include chemically pulped fibers and mechanically pulped fibers,
wherein the cellulosic papermaking fibers have a percentage by weight of eucalyptus fibers, an ISO brightness of at least about 83, a Canadian Standard Freeness (CSF) of at least about 400 ml, a bulk of between 2.2 and 4.2 cc/g, and a breaking length of between about 1.2 and about 4.7 km.

15. The cellulosic tissue of claim 14 , wherein the tissue exhibits a machine direction (MD) stretch of between about 20% and about 30%.

16. The cellulosic tissue of claim 14 , wherein the chemically pulped fibers are selected from a group consisting of hardwood and softwood fibers.

17. The cellulosic tissue of claim 16 , wherein the weight percentage of chemically pulped softwood fibers in the tissue is at most 30%.

18. The cellulosic tissue of claim 14 , wherein the eucalyptus fibers have been prepared from eucalyptus chips by alkaline peroxide mechanical pulping.

19. The cellulosic tissue of claim 14 , wherein the eucalyptus fibers have been prepared from eucalyptus chips by pre-conditioning refiner chemical alkaline peroxide mechanical pulping.

20. A cellulosic tissue comprising:
a percentage by weight of cellulosic papermaking fibers that include chemically pulped fibers and mechanically pulped fibers, wherein the cellulosic papermaking fibers have (i) from about 3% to about 30% by weight regenerated cellulosic microfibers, and (ii) from about 10% to about 50% eucalyptus fibers, and
wherein the cellulosic tissue exhibits a machine direction (MD) stretch of between about 20% and about 30%.

21. The cellulosic tissue of claim 20 , wherein the chemically pulped fibers are selected from a group consisting of hardwood and softwood fibers.

22. The cellulosic tissue of claim 21 , wherein the weight percentage of chemically pulped softwood fibers in the tissue is at most 30%.

23. A cellulosic tissue comprising:
(a) at least one of (i) a percentage of recycle fiber and (ii) a percentage of eucalyptus kraft fiber;
(b) a percentage by weight of regenerated cellulosic microfibers; and
(c) a percentage by weight of eucalyptus fibers,
wherein the cellulosic tissue has a basis weight of from about 10 to about 17 lbs per ply per 3000 sq ft ream, a specific geometric mean tensile of between about 35 and 45 g/3 in. per pound of basis weight, and a specific eight sheet caliper of between about 3 to about 3.5 mils per ply per eight sheets per pound of basis weight.

24. The cellulosic tissue of claim 23 , wherein the percentage of recycle fiber is from about 40% to about 70%.

25. The cellulosic tissue of claim 23 , wherein the percentage by weight of eucalyptus fibers is from about 15% to about 30%.

26. The cellulosic tissue of claim 23 , wherein the cellulosic tissue exhibits a machine direction (MD) stretch of between about 20% and about 30%.

27. The cellulosic tissue of claim 23 , further comprising chemically pulped fibers selected from a group consisting of hardwood and softwood fibers.

28. The cellulosic tissue of claim 27 , wherein the weight percentage of chemically pulped softwood fibers in the tissue is at most 30%.

29. The cellulosic tissue of claim 23 , wherein the eucalyptus fibers have been prepared from eucalyptus chips by alkaline peroxide mechanical pulping.

30. The cellulosic tissue of claim 23 , wherein the eucalyptus fibers have been prepared from eucalyptus chips by pre-conditioning refiner chemical alkaline peroxide mechanical pulping.

31. A cellulosic tissue comprising:
(a) at least one of (i) a percentage of softwood kraft fiber and (ii) a percentage of hardwood kraft fiber;
(b) a percentage by weight of regenerated cellulosic microfiber; and
(c) a percentage by weight of eucalyptus fibers,
wherein the cellulosic tissue has a basis weight of from about 11 to about 17 per ply lbs per 3000 sq ft ream, a specific geome

Assignees

• Gpcp Ip Holdings Llc

Inventors

• Lee Jeffrey A
• Sumnicht Daniel W

Classifications

• Y10T428/24612

  Composite web or sheet · CPC title

• D21H27/002 Primary

  Tissue paper; Absorbent paper (D21H21/22, D21H27/02, D21H27/20 take precedence; toilet paper A47K10/00; absorbent pads for physiological fluids A61L15/16; making on paper-making machines D21F11/00) · CPC title

• D21H13/08

  from regenerated cellulose · CPC title

• D21H11/02

  Chemical or chemomechanical {or chemothermomechanical} pulp · CPC title

• B32B2555/00

  Personal care · CPC title