Soft sanitary tissue paper web products comprising nano-filaments

• US 10,682,021 B2
• Filed: 09/30/2019
• Issued: 06/16/2020
• Est. Priority Date: 07/01/2016
• Status: Active Grant

• Current Assignee: Mercer International Incorporated
• Original Assignee: Mercer International Incorporated
• Inventors: Ziegenbein, Tobias
• Primary Examiner(s): Fortuna, Jose A
• Application Number:
  US16/587,096
• Publication Number:
  US 20200022537A1
• Time in Patent Office: 260 Days
• CPC Class Codes: A47K 10/16 Paper towels; Toilet paper; Holders therefor dispensers A47K10/32
• CPC Class Codes: B32B 21/13 all layers being exclusively wood
• CPC Class Codes: B32B 2255/26 Polymeric coating
• CPC Class Codes: B32B 2262/0223 Vinyl resin fibres
• CPC Class Codes: B32B 2262/0253 Polyolefin fibres vinyl or acrylic copolymers B32B2262/0223 or B32B2262/0246
• CPC Class Codes: B32B 2262/0261 Polyamide fibres
• CPC Class Codes: B32B 2262/0276 Polyester fibres
• CPC Class Codes: B32B 2262/06 Vegetal fibres
• CPC Class Codes: B32B 2262/062 Cellulose fibres, e.g. cotton
• CPC Class Codes: B32B 2262/067 Wood fibres
• CPC Class Codes: B32B 2262/08 Animal fibres, e.g. hair, wool, silk
• CPC Class Codes: B32B 2262/10 Inorganic fibres layered products comprising a layer of natural mineral fibres B32B19/00
• CPC Class Codes: B32B 2262/101 Glass fibres
• CPC Class Codes: B32B 2262/14 Mixture of at least two fibres made of different materials
• CPC Class Codes: B32B 23/10 next to a fibrous or filamentary layer
• CPC Class Codes: B32B 2307/718 Weight, e.g. weight per square meter
• CPC Class Codes: B32B 2307/73 Hydrophobic
• CPC Class Codes: B32B 2307/732 Dimensional properties
• CPC Class Codes: B32B 2555/00 Personal care
• CPC Class Codes: B32B 29/005 next to another layer of paper or cardboard layer
• CPC Class Codes: B32B 5/26 : another layer next to it also being fibrous or filamentary relative arrangement of fibres or filaments of different layers B32B5/12
• CPC Class Codes: B32B 7/12 : using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: B82Y 40/00 : Manufacture or treatment of nanostructures
• CPC Class Codes: B82Y 99/00 : Subject matter not provided for in other groups of this subclass
• CPC Class Codes: D21C 9/002 : by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives
• CPC Class Codes: D21H 11/00 : Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
• CPC Class Codes: D21H 11/18 : Highly hydrated, swollen or fibrillatable fibres
• CPC Class Codes: D21H 21/52 : Additives of definite length or shape
• CPC Class Codes: D21H 23/76 : characterised by choice of auxiliary compounds which are added separately from at least one other compound, e.g. to improve the incorporation of the latter or to obtain an enhanced combined effect D21H17/18, D21H17/70, D21H23/10 take precedence
• CPC Class Codes: D21H 27/002 : 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 Class Codes: D21H 27/007 : relating to absorbency, e.g. amount or rate of water absorption, optionally in combination with other parameters relating to physical or mechanical properties
• CPC Class Codes: D21H 27/30 : Multi-ply for surface covering D21H27/18; making on paper-making machines D21F9/00, D21F11/00

Abstract

A differential density soft sanitary tissue paper web comprising at least one ply. The differential density soft sanitary tissue paper web comprises from about 2% to about 56.5% of a softwood pulp fiber mixture and from about 43.5% to about 99.9% of a hardwood pulp fiber mixture. The softwood pulp fiber mixture comprises from about 0% to about 56.4% of softwood pulp fiber; from about 0.05% to about 20.0% of cellulose nanofilaments; and, from about 0.05% to about 3.0% of strengthening additive.

Claims

1. A differential density soft sanitary tissue paper web comprising at least one ply, said differential density soft sanitary tissue paper web comprising:

a) from about 2% to about 56.5% by weight of said differential density soft sanitary tissue paper web of a softwood pulp fiber mixture, said softwood pulp fiber mixture comprising;

1) from about 0% to about 56.4% by weight of the dry fiber basis of said differential density soft sanitary tissue paper web of softwood pulp fiber;

2) from about 0.05% to about 20.0% by weight of the dry fiber basis of said differential density soft sanitary tissue paper web of cellulose nanofilaments; and

,

3) from about 0.05% to about 3.0% by weight of the dry fiber basis of said differential density soft sanitary tissue paper web of strengthening additive; and

,

b) from about 43.5% to about 99.9% by weight of the dry fiber basis of said differential density soft sanitary tissue paper web of a hardwood pulp fiber mixture.

2. The differential density soft sanitary tissue paper web of claim 1 wherein said softwood pulp fiber is refined.

3. The differential density soft sanitary tissue paper web of claim 1 further comprising up to about 20% by weight of the dry fiber basis of said differential density soft sanitary tissue paper web of a fiber selected from the group consisting of fibrillated man-made cellulose, non-wood natural fibers, non-cellulosic fibers, and combinations thereof.

4. The differential density soft sanitary tissue paper web of claim 1 further comprising less than about 2.0% by weight of a chemical papermaking additive selected from the group consisting of debonders, silicone, softening additives, absorbency additives, aesthetic additives, and combinations thereof.

5. The differential density soft sanitary tissue paper web of claim 1 wherein said differential density soft sanitary tissue paper web comprises at least two plies.

6. The differential density soft sanitary tissue paper web of claim 5 wherein said differential density soft sanitary tissue paper web comprises at least three plies.

7. The differential density soft sanitary tissue paper web of claim 6 wherein said differential density soft sanitary tissue paper web comprises at least four plies.

8. The differential density soft sanitary tissue paper claim 1 wherein said cellulose nanofilaments are high aspect ratio cellulose nanofilaments.

9. The differential density soft sanitary tissue paper claim 1 further comprising from about 0.1% to about 10% by weight of the dry fiber basis of said differential density soft sanitary tissue paper web of said cellulose nanofilaments.

10. The differential density soft sanitary tissue paper claim 1 further comprising:

a) from 0% to about 3.0% by weight of the dry fiber basis of said differential density soft sanitary tissue paper web of a debonder; and

,

b) from 0% to about 3.0% by weight of the dry fiber basis of said differential density soft sanitary tissue paper web of a silicone.

11. A differential density soft sanitary tissue paper web comprising at least one ply, said differential density soft sanitary tissue paper web comprising:

(a) from about 2% to about 56.5% by weight of the dry fiber basis of said differential density soft sanitary tissue paper web of a softwood pulp fiber mixture, said softwood pulp fiber mixture comprising;

1) from about 0% to about 56.4% by weight of the dry fiber basis of said differential density soft sanitary tissue paper web of a softwood pulp fiber; and

,

2) at least about 0.05% to about 20% by weight of the dry fiber basis of said differential density soft sanitary tissue paper web of a blend of cellulose micro-filaments and cellulose nano-filaments, wherein said blend of cellulose micro-filaments and cellulose nano-filaments comprises;

A) at least about 50% by weight of said blend of cellulose micro-filaments and cellulose nano-filaments of cellulose micro-filaments and cellulose nano-filaments;

B) at least about 10% by weight of said blend of cellulose micro-filaments and cellulose nano-filaments of intact fibrillated fibers; and

C) at least about 5% by weight of said blend of cellulose micro-filaments and cellulose nano-filaments of cellulosic fines; and

,

b) from about 0.05% to about 3.0% by weight of the by weight of the dry fiber basis of said differential density soft sanitary tissue paper web of strengthening additive; and

,

c) from about 43.5% to about 99.9% by weight of the by weight of the dry fiber basis of said differential density soft sanitary tissue paper web of a hardwood pulp fiber mixture.

12. The differential density soft sanitary tissue paper web of claim 11 wherein said softwood pulp fiber is refined.

13. The differential density soft sanitary tissue paper web of claim 11 further comprising up to about 20% by weight of the dry fiber basis of said differential density soft sanitary tissue paper web of a fiber selected from the group consisting of fibrillated man-made cellulose, non-wood natural fibers, non-cellulosic fibers, and combinations thereof.

14. The differential density soft sanitary tissue paper web of claim 11 wherein said softwood pulp fiber mixture further comprises less than about 2.0% by weight of the dry fiber basis of said differential density soft sanitary tissue paper web of a chemical papermaking additive selected from the group consisting of debonders, silicones, softening additives, absorbency additives, aesthetic additives, and combinations thereof.

15. The differential density soft sanitary tissue paper web of claim 11 wherein said differential density soft sanitary tissue paper web comprises at least two plies.

16. The differential density soft sanitary tissue paper web of claim 15 wherein said differential density soft sanitary tissue paper web comprises at least three plies.

17. The differential density soft sanitary tissue paper web of claim 16 wherein said differential density soft sanitary tissue paper web comprises at least four plies.

18. The differential density soft sanitary tissue paper web of claim 11 wherein said cellulose micro-filaments and cellulose nano-filaments are high aspect ratio cellulose micro-filaments and cellulose nano-filaments.

19. The differential density soft sanitary tissue paper web of claim 11 further comprising from about 0.1% to about 10% by weight of the dry fiber basis of said differential density soft sanitary tissue paper web of said cellulose micro-filaments and cellulose nano-filaments.

20. The differential density soft sanitary tissue paper web of claim 11 further comprising:

a) from 0% to about 3.0% by weight of the dry fiber basis of said differential density soft sanitary tissue paper web of a debonder; and

,

b) from 0% to about 3.0% by weight of the dry fiber basis of said differential density soft sanitary tissue paper web.