IP Library › Granted Patent US 7,166,190
Granted Patent B2
US 7,166,190 · App. 11/067,857 · Granted Jan 23, 2007

Methods for forming a fluted composite

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Quick Facts
Patent No.
US 7,166,190
App. No.
11/067,857
Granted
Jan 23, 2007
Kind
B2
Abstract

Methods for forming an absorbent fibrous composite containing absorbent material dispersed in bands through the composite and along the composite's length are disclosed. The methods generally include depositing a fibrous slurry on a foraminous support to form a web and depositing or injecting absorbent material into the web across its width to provide a web having absorbent material in bands along the composite's length. Drying the web provides a fluted absorbent composite. In one embodiment, the method is a wetlaid method and in another embodiment, the method is a foam-forming method. Preferably, the methods are twin-wire forming methods.

Claims (33)

1. A method for making a fibrous layer, comprising:

refining cellulosic fibers to provide refined fibers, wherein the cellulosic fibers comprise crosslinked cellulosic fibers;

combining the refined fibers with a dispersion medium to provide a fibrous slurry;

depositing the fibrous slurry on a foraminous support to provide a wet composite;

introducing an absorbent material into said wet composite at a plurality of points across the width of the composite in the cross-machine direction, said absorbent material having an absorbent capacity greater than the refined cellulosic fibers; and

drying the wet composite to provide a fibrous layer.

2. The method of claim 1 , wherein the cellulosic fibers comprise a blend of crosslinked cellulosic fibers and noncrosslinked cellulosic fibers.

3. The method of claim 2 , wherein the noncrosslinked fibers are at least one of softwood fibers or hardwood fibers.

4. The method of claim 2 , wherein the noncrosslinked fibers comprise southern pine fibers.

5. The method of claim 1 , wherein the cellulosic fibers comprise a blend of crosslinked cellulosic fibers and southern pine fibers.

6. The method of claim 1 , wherein the cellulosic fibers comprise a refined blend of said crosslinked cellulosic fibers and southern pine fibers.

7. The method of claim 1 , wherein the cellulosic fibers comprise a blend of crosslinked cellulosic fibers and refined southern pine fibers.

8. The method of claim 1 , wherein the cellulosic fibers comprise a refined blend of crosslinked cellulosic fibers and refined southern pine fibers.

9. The method of claim 1 , wherein the method is carried out on at least one of a Fourdrinier or a twin-wire papermaking machine.

10. The method of claim 1 , wherein the method is at least one of a wetlaid method and a foam-forming method.

11. A method for making a fibrous layer, comprising:

refining cellulosic fibers to provide refined fibers, wherein the cellulosic fibers comprise crosslinked cellulosic fibers;

combining the refined fibers with a dispersion medium to provide a fibrous slurry;

moving a first foraminous element in a first path;

moving a second foraminous element in a second path;

passing a first portion of the fibrous slurry into contact with the first foraminous element;

passing a second portion of the fibrous slurry into contact with the second foraminous element;

forming a fibrous web from the slurry by withdrawing liquid from the slurry through the first and second foraminous elements;

introducing and absorbent material into said fibrous web at a plurality of points across the width of the composite in the cross-machine direction, said absorbent material having an absorbant capacity greater than the refined cellulosic fibers; and

drying the web provide a fibrous layer.

12. The method of claim 11 , wherein the cellulosic fibers comprise a blend of crosslinked cellulosic fibers and noncrosslinked cellulosic fibers.

13. The method of claim 12 , wherein the noncrosslinked fibers are at least one of softwood fibers or hardwood fibers.

14. The method of claim 12 , wherein the noncrosslinked fibers comprise southern pine fibers.

15. The method of claim 11 , wherein the cellulosic fibers comprise a blend of crosslinked cellulosic fibers and southern pine fibers.

16. The method of claim 11 , wherein the cellulosic fibers comprise a refined blend of said crosslinked cellulosic fibers and southern pine fibers.

17. The method of claim 11 , wherein the cellulosic fibers comprise a blend of crosslinked cellulosic fibers and refined southern pine fibers.

18. The method of claim 11 , wherein the cellulosic fibers comprise a refined blend of crosslinked cellulosic fibers and refined southern pine fibers.

19. The method of claim 11 , wherein the method is at least one of a wetlaid method or a foam-forming method.