Method of making a fabric-creped absorbent cellulosic sheet
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B31F-001/16
B31F-001/07
출원번호
US-0397745
(2012-02-16)
등록번호
US-8388803
(2013-03-05)
발명자
/ 주소
Super, Guy H.
Edwards, Steven L.
McCullough, Stephen J.
Murray, Frank C.
출원인 / 주소
Georgia-Pacific Consumer Products LP
인용정보
피인용 횟수 :
15인용 특허 :
220
초록▼
A method of making a fabric-creped absorbent cellulosic sheet includes compactively dewatering a papermaking furnish to form a nascent web having a random distribution of papermaking fiber, applying the nascent web to a translating transfer surface that is moving at a transfer surface speed, fabric-
A method of making a fabric-creped absorbent cellulosic sheet includes compactively dewatering a papermaking furnish to form a nascent web having a random distribution of papermaking fiber, applying the nascent web to a translating transfer surface that is moving at a transfer surface speed, fabric-creping the nascent web from the transfer surface at a consistency of from about 30 to about 60 percent utilizing a patterned creping fabric that is traveling at a fabric-creping speed that is slower than the transfer surface speed, the fabric-creping step occurring under pressure in a fabric creping nip defined between the transfer surface and the creping fabric, such that the nascent web is creped from the transfer surface and redistributed on the creping fabric to form a creped web with a drawable reticulum having a plurality of interconnected regions of different local basis weights.
대표청구항▼
1. A method of making a fabric-creped absorbent cellulosic sheet, the method comprising: (a) compactively dewatering a papermaking furnish to form a nascent web having a random distribution of papermaking fiber;(b) applying the nascent web having the random fiber distribution to a translating transf
1. A method of making a fabric-creped absorbent cellulosic sheet, the method comprising: (a) compactively dewatering a papermaking furnish to form a nascent web having a random distribution of papermaking fiber;(b) applying the nascent web having the random fiber distribution to a translating transfer surface that is moving at a transfer surface speed;(c) fabric-creping the nascent web from the transfer surface at a consistency of from about 30 percent to about 60 percent utilizing a patterned creping fabric that is traveling at a fabric-creping speed, the fabric-creping speed being lower than the transfer surface speed, the fabric-creping step occurring under pressure in a fabric creping nip defined between the transfer surface and the creping fabric, such that the nascent web is creped from the transfer surface and redistributed on the creping fabric to form a creped web with a drawable reticulum having a plurality of interconnected regions of different local basis weights, including at least (i) a plurality of fiber enriched regions having a high local basis weight, interconnected by way of (ii) a plurality of lower local basis weight linking regions;(d) applying the creped web to a drying cylinder;(e) drying the creped web on the drying cylinder to form a dried web;(f) peeling the dried web from the drying cylinder;(g) controlling the takeaway angle of the dried web from the drying cylinder, wherein steps (d), (e), (f) and (g) are performed so as to substantially preserve the drawable reticulum; and(h) drawing the dried web between a first draw roll and a second draw roll, the first draw roll moving at a first machine-direction velocity that is eater than the fabric-creping speed. 2. The method according to claim 1, wherein the step of controlling the takeaway angle from the drying cylinder is carried out utilizing a sheet control cylinder. 3. The method according to claim 2, wherein the sheet control cylinder is disposed adjacent to the drying cylinder such that the gap between the surface of the drying cylinder and the surface of the sheet control cylinder is less than about twice the thickness of the dried web. 4. The method according to claim 3, wherein the sheet control cylinder is disposed adjacent to the drying cylinder such that the gap between the surface of the drying cylinder and the surface of the sheet control cylinder is at most about the thickness of the dried web. 5. The method according to claim 1, wherein the drawing step comprises drawing the dried web on-line after the web is peeled from the drying cylinder in the peeling step. 6. The method according to claim 5, wherein the drawing step includes drawing the dried web by at least about 10%. 7. The method according to claim 5, wherein the drawing step includes drawing the dried web by at least about 15%. 8. The method according to claim 5, wherein the drawing step includes drawing the dried web by at least about 30%. 9. The method according to claim 5, wherein the drawing step includes drawing the dried web by at least about 45%. 10. The method according to claim 5, wherein the drawing step includes drawing the dried web by at least about 75%. 11. The method according to claim 1, wherein the drawing step imparts an increase in void volume to the dried web. 12. The method according to claim 1, wherein the drawing step results in a ratio of percent decrease in caliper to percent decrease in basis weight of the dried web being less than 0.85. 13. The method according to claim 1, wherein the drawing step results in a ratio of percent decrease in caliper to percent decrease in basis weight of the dried web being less than 0.7. 14. The method according to claim 1, wherein the drawing step results in a ratio of percent decrease in caliper to percent decrease in basis weight of the dried web being less than 0.6. 15. The method according to claim 1, wherein the second draw roll is moving at a second machine-direction velocity that is greater than the first machine-direction velocity. 16. The method according to claim 1, wherein the dried web wraps over the first draw roll by more than one hundred eighty degrees of the circumference of the first draw roll. 17. The method according to claim 16, wherein the dried web wraps over the second draw roll by more than one hundred eighty degrees of the circumference of the second draw roll. 18. The method according to claim 1, wherein the dried web wraps over each of the first and second draw rolls from about two hundred degrees to about three hundred degrees of the respective circumferences of the first and second draw rolls. 19. The method according to claim 1, wherein the first and second draw rolls are movable with respect to each other. 20. The method according to claim 1, further comprising applying a vacuum of at least five inches of mercury to the creped web after the fabric-creping step. 21. The method according to claim 1, wherein the fabric-creping step occurs under a pressure of at least 20 pounds per linear inch. 22. The method according to claim 1, wherein the fabric-creping step occurs under a pressure of from about 20 to about 200 pounds per linear inch. 23. The method according to claim 1, wherein the fabric-creping step occurs under a pressure of from about 40 to about 70 pounds per linear inch. 24. A method of making a fabric-creped absorbent cellulosic sheet, the method comprising: (a) compactively dewatering a papermaking furnish to form a nascent web having a random distribution of papermaking fiber;(b) applying the nascent web having the random fiber distribution to a translating transfer surface that is moving at a transfer surface speed;(c) fabric-creping the nascent web from the transfer surface at a consistency of from about 30 percent to about 60 percent utilizing a patterned creping fabric that is traveling at a fabric-creping speed, the fabric-creping speed being lower than the transfer surface speed, the fabric-creping step occurring under pressure in a fabric creping nip defined between the transfer surface and the creping fabric, such that the fibers of the nascent web are redistributed on the creping fabric to form a creped web with a drawable reticulum having a plurality of interconnected regions of different local basis weights, including at least (i) a plurality of fiber enriched regions having a high local basis weight, interconnected by way of (ii) a plurality of lower local basis weight linking regions;(d) adhering the creped web to a drying cylinder with a resinous adhesive coating composition;(e) drying the creped web on the drying cylinder to form a dried web;(f) removing the dried web from the drying cylinder, wherein steps (d), (e) and (f) are performed so as to substantially preserve the drawable reticulum; and(g) drawing the dried web between a first draw roll and a second draw roll, the first draw roll moving at a first machine-direction velocity that is greater than the fabric-creping speed. 25. The method according to claim 24, wherein the removing step comprises removing the dried web from the drying cylinder without substantial creping. 26. The method according to claim 24, wherein the removing step comprises removing the dried web from the drying cylinder subsequent to startup, without a creping blade. 27. The method according to claim 24, wherein the removing step comprises peeling the dried web from the drying cylinder while a sheet control cylinder controls the takeaway angle of the web. 28. The method according to claim 24, wherein the resinous adhesive coating composition is a resinous protective coating layer. 29. The method according to claim 28, wherein the resinous protective coating layer comprises a polyamide resin. 30. The method according to claim 29, wherein the polyamide resin is cross-linked. 31. The method according to claim 24, wherein the resinous adhesive coating composition is re-wettable. 32. The method according to claim 24, further comprising a step of maintaining the resinous adhesive coating composition on the drying cylinder such that the composition provides a sufficient wet tack strength upon transfer of the creped web to the drying cylinder to secure the creped web thereto during drying, and wherein the resinous adhesive coating composition is maintained pliant during drying such that the dried web may be removed from the drying cylinder without a creping blade. 33. The method according to claim 24, wherein the resinous adhesive coating composition comprises a polyvinyl alcohol resin. 34. The method according to claim 33, wherein the resinous adhesive coating composition includes at least one resin in addition to the polyvinyl alcohol resin. 35. The method according to claim 24, wherein the resinous adhesive coating composition comprises a polysaccharide resin. 36. The method according to claim 24, wherein the fabric-creping step occurs under a pressure of at least 20 pounds per linear inch. 37. The method according to claim 24, wherein the fabric-creping step occurs under a pressure of from about 20 to about 200 pounds per linear inch. 38. The method according to claim 24, wherein the fabric-creping step occurs under a pressure of from about 40 to about 70 pounds per linear inch. 39. The method according to claim 24, wherein the second draw roll is moving at a second machine-direction velocity that is greater than the first machine-direction velocity. 40. A method of making a fabric-creped absorbent cellulosic sheet, the method comprising: (a) compactively dewatering a papermaking furnish to form a nascent web having a random distribution of papermaking fiber;(b) applying the nascent web having the random fiber distribution to a translating transfer surface that is moving at a transfer surface speed;(c) fabric-creping the nascent web from the transfer surface at a consistency of from about 30 percent to about 60 percent utilizing a patterned creping fabric that is traveling at a fabric-creping speed, the fabric-creping speed being lower than the transfer surface speed, the fabric-creping step occurring under pressure in a fabric creping nip defined between the transfer surface and the creping fabric, such that the fibers of the nascent web are redistributed on the creping fabric to form a creped web with a drawable reticulum having a plurality of interconnected regions of different local basis weights, including at least (i) a plurality of fiber enriched regions having a high local basis weight, interconnected by way of (ii) a plurality of lower local basis weight linking regions;(d) applying the creped web to a drying cylinder;(e) embossing the creped web while the web is disposed on the drying cylinder;(f) drying the creped web on the drying cylinder to form a dried web;(g) removing the dried web from the drying cylinder, wherein steps (d), (e), (f) and (g) are performed so as to substantially preserve the drawable reticulum; and(h) drawing the dried web between a first draw roll and a second draw roll, the first draw roll moving at a first machine-direction velocity that is greater than the fabric-creping speed. 41. The method according to claim 40, wherein the embossing step comprises embossing the creped web when the consistency of the creped web is less than about 80%. 42. The method according to claim 40, wherein the embossing step comprises embossing the creped web when the consistency of the creped web is less than about 70%. 43. The method according to claim 40, wherein the embossing step comprises embossing the creped web when the consistency of the creped web is less than about 50%. 44. The method according to claim 40, wherein the drying cylinder is traveling at a drying cylinder speed and the step of embossing the creped web while the creped web is disposed on the drying cylinder is carried out with an embossing surface that is traveling at a machine direction speed that is lower than the drying cylinder speed. 45. The method according to claim 40, wherein the fabric-creping step occurs under a pressure of at least 20 pounds per linear inch. 46. The method according to claim 40, wherein the fabric-creping step occurs under a pressure of from about 20 to about 200 pounds per linear inch. 47. The method according to claim 40, wherein the fabric-creping step occurs under a pressure of from about 40 to about 70 pounds per linear inch. 48. The method according to claim 40, wherein the second draw roll is moving at a second machine-direction velocity that is greater than the first machine-direction velocity.
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이 특허에 인용된 특허 (220)
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Super, Guy H.; Ruthven, Paul J.; McCullough, Stephen J.; Sze, Daniel H.; Wendt, Greg A.; Miller, Joseph H., Methods of making a belt-creped absorbent cellulosic sheet prepared with a perforated polymeric belt.
Super, Guy H.; Ruthven, Paul J.; McCullough, Stephen J.; Sze, Daniel H.; Wendt, Greg A.; Miller, Joseph H., Methods of making a belt-creped absorbent cellulosic sheet prepared with a perforated polymeric belt.
Edwards, Steven L.; Super, Guy H.; McCullough, Stephen J.; Reeb, Ronald R.; Chou, Hung Liang; Yeh, Kang Chang; Dwiggins, John H.; Harper, Frank D., Multi-ply absorbent sheet of cellulosic fibers.
Edwards, Steven L.; Super, Guy H.; McCullough, Stephen J.; Reeb, Ronald R.; Chou, Hung Liang; Yeh, Kang Chang; Dwiggins, John H.; Harper, Frank D., Multi-ply absorbent sheet of cellulosic fibers.
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