High efficiency disposable cellulosic wiper
View Patent ↗A disposable cellulosic wiper includes a percentage by weight of pulp-derived papermaking fibers having a characteristic scattering coefficient of less than 50 m 2 /kg, and a percentage by weight of fibrillated regenerated independent cellulosic microfibers having a number average diameter of less than about 2 microns and a characteristic Canadian Standard Freeness (CSF) value of less than 175 ml. The microfibers are selected and present in amounts such that the wiper exhibits a scattering coefficient of greater than 50 m 2 /kg.
1. A disposable cellulosic wiper comprising:
(a) a percentage by weight of pulp-derived papermaking fibers having a characteristic scattering coefficient of less than 50 m 2 /kg; and
(b) from about 10% to about 75% by weight of fibrillated regenerated independent cellulosic microfibers having a number average diameter of less than about 2 microns and a characteristic Canadian Standard Freeness (CSF) value of less than 175 ml,
the microfibers being selected and present in amounts such that the wiper exhibits a scattering coefficient of greater than 50 m 2 /kg.
2. The disposable cellulosic wiper according to claim 1 , wherein the percentage by weight of the pulp-derived papermaking fibers is 25% or more.
3. The disposable cellulosic wiper according to claim 1 , wherein the percentage by weight of the fibrillated regenerated independent cellulosic microfibers is finer than 14 mesh.
4. The disposable cellulosic wiper according to claim 1 , wherein the wiper includes more than 25% by weight of the fibrillated regenerated independent cellulosic microfibers.
5. The disposable cellulosic wiper according to claim 1 , wherein the wiper includes more than 30% by weight of the fibrillated regenerated independent cellulosic microfibers.
6. The disposable cellulosic wiper according to claim 1 , wherein the wiper includes more than 35% by weight of the fibrillated regenerated independent cellulosic microfibers.
7. The disposable cellulosic wiper according to claim 1 , wherein the wiper includes 40% or more by weight of the fibrillated regenerated independent cellulosic microfibers.
8. The disposable cellulosic wiper according to claim 1 , wherein the microfibers are selected and present in an amount such that the wiper exhibits a scattering coefficient of greater than 60 m 2 /kg.
9. The disposable cellulosic wiper according to claim 1 , wherein the microfibers are selected and present in an amount such that the wiper exhibits a scattering coefficient of greater than 70 m 2 /kg.
10. The disposable cellulosic wiper according to claim 1 , wherein the microfibers are selected and present in an amount such that the wiper exhibits a scattering coefficient between 50 m 2 /kg and 120 m 2 /kg.
11. The disposable cellulosic wiper according to claim 1 , wherein the microfibers are selected and present in an amount such that the wiper exhibits a scattering coefficient between 60 m 2 /kg and 120 m 2 /kg.
12. The disposable cellulosic wiper according to claim 1 , wherein the fibrillated regenerated independent cellulosic microfibers have a CSF value of less than 150 ml.
13. The disposable cellulosic wiper according to claim 1 , wherein the fibrillated regenerated independent cellulosic microfibers have a CSF value of less than 100 ml.
14. The disposable cellulosic wiper according to claim 1 , wherein the fibrillated regenerated independent cellulosic microfibers have a CSF value of less than 50 ml.
15. The disposable cellulosic wiper according to claim 1 , wherein the fibrillated regenerated independent cellulosic microfibers have a CSF value of less than 25 ml.
16. The disposable cellulosic wiper according to claim 1 , wherein the fibrillated regenerated independent cellulosic microfibers have a CSF value of 0 ml.
17. The disposable cellulosic wiper according to claim 1 , wherein the wiper has a basis weight of from about 5 lbs per 3,000 square foot ream to about 60 lbs per 3,000 square foot ream, and the fibrillated regenerated independent cellulosic microfibers have a weight average diameter of less than 2 microns and a weight average length of less than 500 microns.
18. The disposable cellulosic wiper according to claim 1 , wherein the wiper has a basis weight of from about 15 lbs per 3,000 square foot ream to about 35 lbs per 3,000 square foot ream, and the fibrillated regenerated independent cellulosic microfibers have a weight average diameter of less than 1 micron and a weight average of less than 400 microns.
19. The disposable cellulosic wiper according to claim 1 , wherein the wiper has an absorbency of at least about 4 g/g.
20. The disposable cellulosic wiper according to claim 1 , wherein the wiper has an absorbency of at least about 4.5 g/g.
21. The disposable cellulosic wiper according to claim 1 , wherein the wiper has an absorbency of at least about 5 g/g.
22. The disposable cellulosic wiper according to claim 1 , wherein the wiper has an absorbency of at least about 7.5 g/g.
23. The disposable cellulosic wiper according to claim 1 , wherein the wiper has an absorbency of from about 6 g/g to about 9.5 g/g.
24. The disposable cellulosic wiper according to claim 1 , wherein the fibrillated regenerated independent cellulosic microfibers are prepared from fiber spun from a cellulosic dope comprising cellulose dissolved in a tertiary amine N-oxide, and have a weight average diameter of less than 2 microns and a weight average length of less than 500 microns.
25. The disposable cellulosic wiper according to claim 1 , wherein the fibrillated regenerated independent cellulosic microfibers are prepared from fiber spun from a cellulosic dope comprising cellulose dissolved in an ionic liquid, and have a weight average diameter of less than 1 micron and a weight average length of less than 400 microns.
26. The disposable cellulosic wiper according to claim 1 , wherein the wiper has a dry machine direction (MD) breaking length of from about 2 km to about 9 km, and the fibrillated regenerated independent cellulosic microfibers have a weight average diameter of less than 2 microns and a weight average length of less than 500 microns.
27. The disposable cellulosic wiper according to claim 1 , wherein the wiper has a cross machine direction (CD) wet breaking length of from about 400 m to about 3000 m, and the fibrillated regenerated independent cellulosic microfibers have a weight average diameter of less than 1 micron and a weight average length of less than 400 microns.
28. The disposable cellulosic wiper according to claim 1 , wherein the wiper has a wet/dry cross machine direction (CD) tensile ratio of between about 35% and about 60%.
29. The disposable cellulosic wiper according to claim 1 , wherein the wiper has a wet/dry cross machine direction (CD) tensile ratio of at least about 40%.
30. The disposable cellulosic wiper according to claim 1 , wherein the wiper has a wet/dry cross machine direction (CD) tensile ratio of at least about 45%.
31. The disposable cellulosic wiper according to claim 1 , wherein the wiper further comprises a dry strength resin.
32. The disposable cellulosic wiper according to claim 31 , wherein the dry strength resin is carboxylmethyl cellulose.
33. The disposable cellulosic wiper according to claim 1 , wherein the wiper further comprises a wet strength resin.
34. The disposable cellulosic wiper according to claim 33 , wherein the wet strength resin is a polyamidamine-epihalo-hydrin resin.
35. The disposable cellulosic wiper according to claim 1 , wherein the wiper has a machine direction (MD) break modulus of from about 50 g/3 in./% to about 400 g/3 in./%.
36. The disposable cellulosic wiper according to claim 1 , wherein the wiper has a machine direction (MD) break modulus of from about 20 g/3 in./% to about 100 g/3 in./%.
37. The disposable cellulosic wiper according to claim 1 , wherein the wiper comprises from about 30% by weight to about 80% by weight of the pulp-derived papermaking fibers having a characteristic scattering coefficient of less than 50 m 2 /kg, and up to 70% by weight of the fibrillated regenerated independent cellulosic microfibers having a CSF value of less than 175 ml.
38. The disposable cellulosic wiper according to claim 1 , wherein the wiper comprises from about 35% by weight to about 70% by weight of the pulp-derived papermaking fibers having a characteristic scattering coefficient of less than 50 m 2 /kg, and from about 30% by weight to about 65% by weight of the fibrillated regenerated independent cellulosic microfibers, the microfibers having a weight average diameter of less than 2 microns and a weight average length of less than 500 microns.
39. The disposable cellulosic wiper according to claim 1 , wherein the wiper comprises from about 40% by weight to about 60% by weight of the pulp-derived papermaking fibers having a characteristic scattering coefficient of less than 50 m 2 /kg and from about 40% by weight to about 60% by weight of the fibrillated regenerated independent cellulosic microfibers, the microfibers having a weight average diameter of less than 1 micron and a weight average length of less than 400 microns.