Absorbent sheet of cellulosic fibers
View Patent ↗An absorbent sheet of cellulosic fibers includes a mixture of hardwood fibers and softwood fibers arranged in a reticulum having (i) a plurality of pileated fiber enriched regions of a relatively high local basis weight each extending a distance in the cross-machine direction (CD) of the sheet and interconnected by way of (ii) a plurality of lower local basis weight linking regions that each extend a distance in the machine direction (MD) of the sheet and whose fiber orientation is biased along the direction between pileated regions interconnected thereby. The relative basis weight, degree of pileation, hardwood to softwood ratio, fiber length distribution, fiber orientation, and geometry of the reticulum are controlled such that the sheet exhibits a percent CD stretch that is at least about 2.75 times the machine direction to cross-machine direction (MD/CD) dry tensile ratio of the sheet.
1. An absorbent sheet of cellulosic fibers, the sheet comprising:
a mixture of hardwood fibers and softwood fibers arranged in a reticulum that includes: (i) a plurality of pileated fiber enriched regions having a relatively high local basis weight, each extending a distance in the cross-machine direction (CD) of the sheet and interconnected by way of (ii) a plurality of lower local basis weight linking regions that each extend a distance in the machine direction (MD) of the sheet and whose fiber orientation is biased along the direction between the pileated fiber enriched regions interconnected thereby,
wherein the relative basis weight, degree of pileation, ratio of hardwood fibers to softwood fibers, fiber length distribution, fiber orientation, and geometry of the reticulum are controlled such that the sheet exhibits a percent CD stretch that is at least about 2.75 times the machine direction to cross-machine direction (MD/CD) dry tensile ratio of the sheet.
2. The absorbent sheet according to claim 1 , wherein the sheet exhibits a void volume of at least about 5 g/g, a CD stretch of at least about 5 percent, and an MD/CD tensile ratio of less than about 1.75.
3. The absorbent sheet according to claim 1 , wherein the sheet exhibits a void volume of at least about 5 g/g, a CD stretch of at least about 5 percent, and an MD/CD tensile ratio of less than about 1.5.
4. The absorbent sheet according to claim 1 , wherein the sheet exhibits a void volume of at least about 5 g/g, a CD stretch of at least about 10 percent, and an MD/CD tensile ratio of less than about 2.5.
5. The absorbent sheet according to claim 1 , wherein the sheet exhibits a void volume of at least about 5 g/g, a CD stretch of at least about 15 percent, and an MD/CD tensile ratio of less than about 3.5.
6. The absorbent sheet according to claim 1 , wherein the sheet exhibits an absorbency of at least about 5 g/g, a CD stretch of at least about 20 percent, and an MD/CD tensile ratio of less than about 5.
7. The absorbent sheet according to claim 1 , wherein the sheet exhibits a percent CD stretch that is at least about three times the dry tensile ratio of the sheet.
8. The absorbent sheet according to claim 1 , wherein the sheet exhibits a percent CD stretch that is at least about 3.25 times the dry tensile ratio of the sheet.
9. The absorbent sheet according to claim 1 , wherein the sheet exhibits a percent CD stretch that is at least about 3.5 times the dry tensile ratio of the sheet.
10. The absorbent sheet according to claim 1 , wherein the sheet exhibits a percent CD stretch of at least about five.
11. The absorbent sheet according to claim 1 , wherein the sheet exhibits a percent CD stretch of at least about six.
12. The absorbent sheet according to claim 1 , wherein the sheet exhibits a percent CD stretch of at least about eight.
13. The absorbent sheet according to claim 1 , wherein the sheet exhibits a percent CD stretch of at least about ten.
14. The absorbent sheet according to claim 1 , wherein the sheet has a void volume of at least 6 g/g.
15. The absorbent sheet according to claim 1 , wherein the sheet has a void volume of at least 7 g/g.
16. The absorbent sheet according to claim 1 , wherein the sheet has a void volume of at least 8 g/g.
17. The absorbent sheet according to claim 1 , wherein the sheet has a void volume of at least 9 g/g.
18. The absorbent sheet according to claim 1 , wherein the sheet has a void volume of at least 10 g/g.
19. The absorbent sheet according to claim 1 , wherein the sheet consists predominantly of hardwood fiber.
20. The absorbent sheet according to claim 1 , wherein the sheet consists predominantly of softwood fiber.
21. An absorbent sheet of fibers, the sheet comprising:
a mixture of hardwood fibers and softwood fibers arranged in a reticulum that includes: (i) a plurality of pileated fiber enriched regions having a relatively high local basis weight, each extending a distance in the cross-machine direction (CD) of the sheet and interconnected by way of (ii) a plurality of lower local basis weight linking regions that each extend a distance in the machine direction (MD) of the sheet and whose fiber orientation is biased along the direction between the pileated fiber enriched regions interconnected thereby,
wherein the relative basis weight, degree of pileation, ratio of hardwood fibers to softwood fibers, fiber length distribution, fiber orientation, and geometry of the reticulum are controlled such that the sheet exhibits a CD stretch of at least 3.5%.
22. The absorbent sheet according to claim 21 , wherein the sheet exhibits a CD stretch of at least 4%.