Fibrous structures and methods for making same

Patent metadata

Field	Value
Publication number	US-9714484-B2
Application number	US-201615243140-A
Country	US
Kind code	B2
Filing date	Aug 22, 2016
Priority date	Nov 2, 2009
Publication date	Jul 25, 2017
Grant date	Jul 25, 2017

Abstract

Fibrous structures that exhibit a pore volume distribution such that at least 25% and/or at least 43% of the total pore volume present in the fibrous structures exists in pores of radii of from 91 μm to 140 μm, and to methods for making such fibrous structures are provided.

First claim

What is claimed is:

1. A method for making a fibrous structure ply wherein the method comprises the step of combining a plurality of filaments and a plurality of solid additives to form a fibrous structure ply wherein the solid additives are randomly dispersed throughout the fibrous structure ply and further comprises the step of calendering the fibrous structure ply such that the fibrous structure ply exhibits a pore volume distribution such that at least 25% of the total pore volume present in the fibrous structure exists in pores of radii of from 91 μm to 120 μm.

2. The method according to claim 1 wherein the fibrous structure exhibits a pore volume distribution such that at least 45% of the total pore volume present in the fibrous structure exists in pores of radii of from 91 μm to 140 μm.

3. The method according to claim 1 wherein at least one of the solid additives comprises a fiber.

4. The method according to claim 3 wherein the fiber comprises a wood pulp fiber.

5. The method according to claim 4 wherein the wood pulp fiber is selected from the group consisting of: Southern Softwood Kraft pulp fibers, Northern Softwood Kraft pulp fibers, Eucalyptus pulp fibers, Acacia pulp fibers.

6. The method according to claim 1 wherein at least one of the plurality of filaments comprises a thermoplastic polymer.

7. The method according to claim 6 wherein the thermoplastic polymer comprises a polyolefin.

8. The method according to claim 7 wherein the polyolefin is selected from the group consisting of: polypropylene, polyethylene, and mixtures thereof.

9. The method according to claim 8 wherein the polyolefin comprises polypropylene.

10. The fibrous structure according to claim 6 wherein the thermoplastic polymer is selected from the group consisting of: polypropylene, polyethylene, polyester, polylactic acid, polyhydroxyalkanoate, polyvinyl alcohol, polycaprolactone and mixtures thereof.

11. The method according to claim 1 wherein at least one of the plurality of filaments comprises a natural polymer.

12. The method according to claim 11 wherein the natural polymer is selected from the group consisting of: starch, starch derivatives, cellulose, cellulose derivatives, hemicellulose, hemicellulose derivatives and mixtures thereof.

13. The method according to claim 1 wherein the method further comprises the step of depositing the filaments onto a patterned belt that creates a non-random, repeating pattern of microregions.

14. The method according to claim 1 wherein the method further comprises the step of depositing a second layer of filaments onto a surface of the fibrous structure.

15. The method according to claim 1 wherein the fibrous structure comprises at least a bi-modal pore volume distribution.

16. The method according to claim 15 wherein at least 2% of the total pore volume present in the fibrous structure exists in pores of radii of less than about 100 μm.

17. The method according to claim 1 wherein the fibrous structure exhibits a VFS of at least 5 g/g.

18. The method according to claim 1 wherein the method further comprises the step of convolutedly winding the fibrous structure upon itself to form of a roll.

Assignees

• Procter & Gamble

Inventors

• Barnholtz Steven Lee
• Trokhan Paul Dennis
• Barkey Douglas Jay
• Young Christopher Michael
• Suer Michael Donald

Classifications

• Y10T428/24479

  including variation in thickness · CPC title

• D21H17/28

  Starch · CPC title

• D21H17/34

  obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• Y10T428/249924

  Noninterengaged fiber-containing paper-free web or sheet which is not of specified porosity · CPC title

• D04H1/407

  containing absorbing substances, e.g. activated carbon · CPC title