Tissue paper with reduced fiber and methods of manufacture

Patent metadata

Field	Value
Publication number	US-11932994-B2
Application number	US-201917297249-A
Country	US
Kind code	B2
Filing date	Nov 27, 2019
Priority date	Nov 29, 2018
Publication date	Mar 19, 2024
Grant date	Mar 19, 2024

Abstract

Tissue paper of the disclosure exhibits advantageous softness and bulk at a basis weight less than that of basis weights found in currently available commercial tissue products, while delivering adequate strength for machine runability and consumer usage. This tissue is a lightweight paper that comprises a fiber core with up to 60% mechanically fibrillated fibers and a retention or drainage aid such as a cationic polyacrylamide polymer that facilitates drainage, softness, and bulk. This approach can reduce the fiber content of tissue products significantly while delivering the desired strength and other critical properties.

First claim

What is claimed:

1. A cellulose fiber slurry for use in the manufacture of a tissue paper, the cellulose fiber slurry comprising cellulose fibers that have been subjected to mechanical or chemical fibrillation of between about 1% to about 60% fiber dry weight of the cellulose fiber to a freeness level between about 50 mL Canadian Standard Freeness (CSF) and about 390 mL CSF; and a retention or drainage aid, wherein the cellulose fiber slurry has a freeness level greater than about 250 mL CSF.

2. The cellulose fiber slurry of claim 1 , wherein the cellulose fibers comprise hardwood chemical pulp or a combination of hardwood and softwood chemical pulps.

3. The cellulose fiber slurry of claim 2 , wherein the cellulose fiber slurry further comprises recycled cellulose fibers, mechanical cellulose fibers, non-wood cellulose fibers, or any combination thereof.

4. The cellulose fiber slurry of claim 1 , wherein the cellulose fiber slurry comprises recycled cellulose fibers, mechanical cellulose fibers, non-wood cellulose fibers, or any combination thereof.

5. The cellulose fiber slurry of claim 1 , wherein the amount of the retention or drainage aid is between about 0.005% to about 4% of the dry weight of the cellulose fibers.

6. The cellulose fiber slurry of claim 1 , wherein the retention or drainage aid is selected from the group consisting of a cationic or anionic acrylamide copolymer, a PEI copolymer, polyethylene oxide (PEO), and a cationic polymer combined with an anionic microparticle.

7. The cellulose fiber slurry of claim 6 , wherein the anionic microparticle is colloidal silica, bentonite, a micropolymer, or any combination thereof.

Assignees

• Univ North Carolina State

Inventors

• Gonzalez Ronalds W
• Zambrano Franklin J
• Jameel Hasan
• Venditti Richard A
• Pal Lokendra

Classifications

• D21H27/005 Primary

  relating to physical or mechanical properties, e.g. tensile strength, stretch, softness · CPC title

• D21H11/18 Primary

  Highly hydrated, swollen or fibrillatable fibres · CPC title

• D21H21/10

  Retention agents or drainage improvers · CPC title

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title

• D21H27/002

  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