Creping adhesive compositions and methods of using those compositions

Patent metadata

Field	Value
Publication number	US-9702088-B2
Application number	US-201615132629-A
Country	US
Kind code	B2
Filing date	Apr 19, 2016
Priority date	Jan 5, 2011
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

Improvements to absorbent sheet manufacture include spraying a softener onto the web and providing a creping adhesive to a surface of a heated drying cylinder of a Yankee dryer such that a creping adhesive coating is formed, the creping adhesive comprising a poly(aminoamide)epihalohydrin (PAE) resin and a polyvinyl alcohol copolymer, wherein the polyvinyl alcohol copolymer includes functional repeat units selected from carboxylate repeat units, sulfonate repeat units as well as combinations of the comonomers. A preferred PAE resin is fully crosslinked PAE resin.

First claim

What is claimed is:

1. A method of making absorbent sheet comprising: (a) dewatering an aqueous papermaking furnish to form a nascent web; (b) spraying a softener onto the web; (c) providing a creping adhesive to a surface of a heated drying cylinder of a Yankee dryer such that a creping adhesive coating is formed, the creping adhesive comprising a non-thermosetting poly(aminoamide)-epihalohydrin (PAE) resin and a polyvinyl alcohol copolymer, wherein the weight ratio of polyvinyl alcohol copolymer to PAE resin is from 3:1 to 7:1, and the polyvinyl alcohol copolymer comprises vinyl acetate repeat units and functional repeat units selected from carboxylate repeat units, sulfonate repeat units, and combinations thereof and has a degree of hydrolysis of from 70% to 85 mole %; (d) transferring the web to the surface of the heated drying cylinder of the Yankee dryer in a transfer nip such that the web is adhered to the drying cylinder by the creping adhesive coating; (e) drying the web to a predetermined dryness on the surface of the drying cylinder; and (f) removing the dried web from the drying cylinder surface.

2. The method of making absorbent sheet according to claim 1 , wherein the dried web is removed from the drying cylinder surface with a creping blade.

3. The method of making absorbent sheet according to claim 1 , wherein the dried web is peeled from the drying cylinder surface.

4. The method of making absorbent sheet according to any of claim 1 , wherein the dried web is at least 90% dry upon removal from the drying cylinder surface.

5. The method of making absorbent sheet according to any of claim 1 , wherein the dried web is at least 95% dry upon removal from the drying cylinder surface.

6. The method of making absorbent sheet according to claim 1 , wherein the dried web is at least 98% dry upon removal from the drying cylinder surface.

7. The method of making absorbent sheet according to claim 1 , including spraying softener onto the Yankee side of the web.

8. The method of making absorbent sheet according to claim 1 , wherein softener is applied to the web at an add-on rate of from 0.45 to 13.62 kg (1 to 30 lbs) of softener per tonne (ton) of papermaking fiber in the web.

9. The method of making absorbent sheet according to claim 1 , wherein softener is applied to the web at an add-on rate of from 0.91 to 6.81 kg (2 to 15 lbs) of softener per tonne (ton) of papermaking fiber in the web.

10. The method of making absorbent sheet according to claim 1 , wherein softener is applied to the web at an add-on rate of from 1.36 to 4.54 kg (3 to 10 lbs) of softener per tonne (ton) of papermaking fiber in the web.

11. The method of making absorbent sheet according to claim 1 , wherein the creping adhesive is applied to the heated drying cylinder of the Yankee dryer at a rate corresponding to from 0.91 kg (2 lbs) per tonne (ton) of papermaking fiber to 6.81 kg (15 lbs) per tonne (ton) of papermaking fiber.

12. The method of making absorbent sheet according to claim 1 , wherein the creping adhesive is applied to the heated drying cylinder of the Yankee dryer at a rate corresponding to from 1.36 kg (3 lbs) per tonne (ton) of papermaking fiber to 4.54 kg (10 lbs) per tonne (ton) of papermaking fiber.

13. The method of making absorbent sheet according to claim 1 , wherein the creping adhesive is applied to the heated drying cylinder of the Yankee dryer at a rate corresponding to from 1.82 kg (4 lbs) per tonne (ton) of papermaking fiber to 3.63 kg (8 lbs) per tonne (ton) of papermaking fiber.

14. The method of making absorbent sheet according to claim 1 , wherein the web is dried to a consistency of at least 40% prior to providing the web to the transfer nip.

15. The method of making absorbent sheet according to claim 1 , wherein the web is dried to a consistency of at least 45% prior to providing the web to the transfer nip.

16. The method of making absorbent sheet according to claim 1 , wherein the web is dried to a consistency of from 30% to 90% prior to providing the web to the transfer nip.

17. The method of making absorbent sheet according to claim 1 , wherein the web is dried to a consistency of from 65% to 87.5% prior to providing the web to the transfer nip.

18. The method of making absorbent sheet according to claim 1 , wherein the web is dried to a consistency of from 40% to 80% prior to providing the web to the transfer nip.

19. The method of making absorbent sheet according to claim 1 , wherein the web is dried to a consistency of from 35% to 65% prior to providing the web to the transfer nip.

20. The method of making absorbent sheet according to claim 1 , wherein the web is partially dried by through-air drying prior to providing the web to the transfer nip.

21. The method of making absorbent sheet according to claim 1 , wherein the web is partially dried by impingement air drying prior to providing the web to the transfer nip.

22. The method of making absorbent sheet according to claim 1 , wherein the web is partially dried by wet pressing prior to providing the web to the transfer nip.

23. The method of making absorbent sheet according to claim 1 , wherein the web is partially dried prior to providing the web to the transfer nip by way of: (i) compactively dewatering the papermaking furnish to form a nascent web and concurrently applying the web to a rotating backing cylinder; and (ii) fabric-creping the web from the heated backing cylinder surface at a consistency of from about 30% to about 60% utilizing the transfer fabric, the creping step occurring under pressure in a fabric-creping nip defined between the backing cylinder surface and the transfer fabric wherein the fabric is traveling at a fabric speed slower than the speed of said backing cylinder surface, the fabric pattern, nip parameters, velocity delta and web consistency being selected such that the web is creped from the backing cylinder surface and transferred to the transfer fabric.

24. The method of making absorbent sheet according to claim 1 , wherein a step of partially drying the web prior to providing the web to a transfer nip includes providing the web to the transfer fabric, contacting one side of the web with a dewatering fabric such that the web is disposed between the transfer fabric and the dewatering fabric and drawing air successively through the transfer fabric and dewatering fabric.

25. The method of making absorbent sheet according to claim 1 , wherein a step of partially drying the web prior to a transfer nip comprises wet pressing the web onto the transfer fabric in a dewatering nip.

26. The method of making absorbent sheet according to claim 1 , wherein the PAE resin is a fully crosslinked PAE resin.

27. A method of making absorbent sheet comprising: (a) dewatering an aqueous papermaking furnish to form a nascent web; (b) partially drying the web to a consistency of at least 35% prior to providing the web to a transfer nip; (c) disposing the web on a transfer fabric prior to providing the web to the transfer nip; (d) spraying a softener onto the web; (e) providing a creping adhesive to a surface of a heated drying cylinder of a Yankee dryer such that a creping adhesive coating is formed, the creping adhesive comprising a non-thermosetting poly(aminoamide)-epihalohydrin (PAE) resin and a polyvinyl alcohol copolymer, wherein the weight ratio of polyvinyl alcohol copolymer to PAE resin is from 3:1 to 7:1, and the

Assignees

• Georgia Pacific Consumer Products Lp

Inventors

• White David W
• Boettcher Jeffery J
• Lepp Eric J

Classifications

• D21H25/005

  Mechanical treatment (D21H25/08, D21H25/18 take precedence) · CPC title

• D21H21/146 Primary

  Crêping adhesives · CPC title

• D21H21/14

  characterised by function or properties in or on the paper (D21H19/66, D21H27/02 take precedence) · 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