A multi-ply absorbent sheet of cellulosic fiber with continuous outer surfaces is provided an absorbent core between the outer surfaces. The absorbent core includes a non-woven fiber network having: (i) a plurality of pileated fiber enriched of relatively high local basis weight interconnected by wa
A multi-ply absorbent sheet of cellulosic fiber with continuous outer surfaces is provided an absorbent core between the outer surfaces. The absorbent core includes a non-woven fiber network having: (i) a plurality of pileated fiber enriched of relatively high local basis weight interconnected by way of (ii) a plurality of lower local basis weight linking whose fiber orientation is biased along the direction between pileated interconnected thereby, and (iii) a plurality of fiber-deprived cellules between the fiber enriched and linking regions, also being characterized by a local basis weight lower than the fiber enriched regions. The cellules provide a sponge-like internal structure of low fiber density regions.
대표청구항▼
What is claimed is: 1. A multi-ply absorbent sheet of cellulosic fiber provided with continuous outer surfaces and an absorbent core between the outer surfaces, the absorbent core including a non-woven fiber network comprising: (i) a plurality of pileated fiber enriched of relatively high local bas
What is claimed is: 1. A multi-ply absorbent sheet of cellulosic fiber provided with continuous outer surfaces and an absorbent core between the outer surfaces, the absorbent core including a non-woven fiber network comprising: (i) a plurality of pileated fiber enriched of relatively high local basis weight interconnected by way of (ii) a plurality of lower local basis weight linking whose fiber orientation is biased along the direction between pileated interconnected thereby, and (iii) a plurality of fiber-deprived cellules between the fiber enriched and linking regions, also being characterized by a local basis weight lower than the fiber enriched, wherein the sheet has a Wet Springback Ratio of at least about 0.6. 2. The multi-ply absorbent sheet according to claim 1, wherein the sheet is a two-ply sheet. 3. The multi-ply absorbent sheet according to claim 1, wherein the sheet is a three-ply sheet. 4. The multi-ply absorbent sheet according to claim 1, wherein the non-woven network of the core is an open mesh structure defining a plurality of cellules having regions devoid of fiber. 5. The multi-ply absorbent sheet according to claim 4, wherein the void of the cellules have an average span of from about 10 to about 2500 microns. 6. The multi-ply absorbent sheet according to claim 4, wherein the void of the cellules have an average span of from about 50 to about 500 microns. 7. The multi-ply absorbent sheet according to claim 1, wherein the fiber-deprived cellules have an average span of from about 50 to about 2500 microns. 8. The multi-ply absorbent sheet according to claim 1, wherein the fiber-deprived cellules have an average span of from about 100 to about 500 microns. 9. The multi-ply absorbent sheet according to claim 1, wherein the fiber-deprived cellules comprise a plurality of integument of fiber connecting pileated to adjacent pileated and linking to adjacent linking regions. 10. The multi-ply absorbent sheet according to claim 1, wherein the sheet has a bulk of at least about 6 cc/g. 11. The multi-ply absorbent sheet according to claim 1, wherein the sheet has a bulk of at least about 7.5 cc/g. 12. The multi-ply absorbent sheet according to claim 1, wherein the sheet has a bulk of at least about 10 cc/g. 13. The multi-ply absorbent sheet according to claim 1, wherein the sheet has a bulk of at least about 15 cc/g. 14. The multi-ply absorbent sheet according to claim 1, wherein the sheet has an absorbency of at least 5 g/g. 15. The multi-ply absorbent sheet according to claim 1, wherein the sheet has an absorbency of at least about 7 g/g. 16. The multi-ply absorbent sheet according to claim 1, wherein the sheet has an absorbency of at least about 9 g/g. 17. The multi-ply absorbent sheet according to claim 1, wherein the sheet has an absorbency of at least about 11 g/g. 18. The multi-ply absorbent sheet according to claim 1, wherein the sheet has an absorbency of at least about 13 g/g. 19. The multi-ply absorbent sheet according to claim 1, wherein the sheet has a void volume fraction of from about 0.75 to about 0.85. 20. The multi-ply absorbent sheet according to claim 1, wherein the sheet has a Wet Springback Ratio of at least about 0.65. 21. The multi-ply absorbent sheet according to claim 1, wherein the sheet has a Wet Springback Ratio of from about 0.6 to about 0.8. 22. A three-ply absorbent sheet comprising: a) a first outer ply of cellulosic sheet having a substantially continuous surface; b) a second outer ply of cellulosic sheet having a substantially continuous surface; and c) an absorbent core ply sandwiched between the outer plies consisting essentially of a non-woven fiber network of cellulosic fiber comprising: (i) a plurality of pileated fiber enriched of relatively high local basis weight interconnected by way of (ii) a plurality of lower local basis weight linking whose fiber orientation is biased along the direction between pileated cells interconnected thereby, and (iii) a plurality of fiber-deprived cellules between the fiber enriched and linking regions, also being characterized by a local basis weight lower than the fiber enriched regions, wherein the sheet has a void volume fraction of from about 0.7 to 0.9. 23. A two-ply absorbent sheet of cellulosic fiber comprising: a) a first ply having a substantially continuous first surface and a second surface with local variations in basis weight comprising: (i) a plurality of pileated fiber enriched of relatively high local basis weight interconnected by way of (ii) a plurality of lower local basis weight linking whose fiber orientation is biased along the direction between pileated cells interconnected thereby, and (iii) a plurality of fiber-deprived cellules between the fiber enriched and linking regions, also being characterized by a local basis weight lower than the fiber enriched regions; b) a second ply having a substantially continuous third surface and a fourth surface with local variation in basis weight comprising: (i) a plurality of pileated fiber enriched of relatively high local basis weight interconnected by way of (ii) a plurality of lower local basis weight linking whose fiber orientation is biased along the direction between pileated cells interconnected thereby, and (iii) a plurality of fiber-deprived cellules between the fiber enriched and linking regions, also being characterized by a local basis weight lower than the fiber enriched regions, wherein the plies are secured to each other such that the second surface of the first ply is in contact with the fourth surface of the second ply to form the core of the sheet and the first surface of the first ply and the third surface of the second ply are outer surfaces of the sheet, and wherein the sheet has a Wet Springback Ratio of at least about 0.6. 24. A multi-ply absorbent sheet of cellulosic fiber provided with outer continuous surfaces and an absorbent core between the outer surfaces, the absorbent core including a non-woven fiber network comprising: (i) a plurality of pileated fiber enriched of relatively high local basis weight interconnected by way of (ii) a plurality of lower local basis weight linking whose fiber orientation is biased along the direction between pileated cells interconnected thereby, and (iii) a plurality of fiber-deprived cellules between the fiber enriched and linking regions, also being characterized by a local basis weight lower than the fiber enriched regions, wherein at least one of the outer surfaces of the sheet is provided with a fused wax composition in intimate contact with the fibers in the web, the fused wax composition including a wax and an emulsifier fused in situ with the sheet and being disposed in the sheet so that the open interstitial microstructure between fibers in the web is substantially preserved and the sheet has a laterally hydrophobic outer surface which exhibits a moisture penetration delay of at least about 2 seconds as well as a contact angle with water of at least 50 degrees at one minute of contact time with the surface. 25. The multi-ply absorbent sheet according to claim 24, wherein the laterally hydrophobic outer surface of the sheet exhibits a moisture penetration delay of from about 3 to about 40 seconds. 26. The multi-ply absorbent sheet according to claim 24, wherein the laterally hydrophobic outer surface of the sheet exhibits a moisture penetration delay of at least about 5 seconds. 27. The multi-ply absorbent sheet according to claim 24, wherein the laterally hydrophobic outer surface of the sheet exhibits a moisture penetration delay of at least about 10 seconds.
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이 특허에 인용된 특허 (143)
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