IP Library › Granted Patent US 7,160,418
Granted Patent B2
US 7,160,418 · App. 10/806,792 · Granted Jan 9, 2007

Wet crepe throughdry process for making absorbent sheet and novel fibrous products

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Quick Facts
Patent No.
US 7,160,418
App. No.
10/806,792
Granted
Jan 9, 2007
Kind
B2
Abstract

An improved process for making sheet from a fibrous furnish includes: depositing the furnish on a foraminous support; compactively dewatering the furnish to form a nascent web; drying the web on a heated cylinder; creping the web therefrom and throughdrying the web to a finished product. The microstructure of the web is controlled so as to facilitate throughdrying. The product exhibits a characteristic throughdrying coefficient of from 4 to 10 when the airflow through the sheet is characterized by a Reynolds Number of less than about 1. The novel products of the invention are characterized by wet springback ratio, hydraulic diameter and an internal bond strength parameter.

Claims (17)

1. A fibrous sheet having a void volume fraction of from about 0.55 to about 0.85 characterized in that said sheet exhibits a wet springback ratio of at least about 0.6 and a hydraulic diameter of from about 3×10 −6 ft to about 8×10 −5 ft with the provisos: (a) that when the void volume fraction of said sheet exceeds about 0.72, said hydraulic diameter of said sheet is less than about 8×10 −6 ft; and (b) that when the void volume fraction of the sheet exceeds about 0.8, said hydraulic diameter of said sheet is less than about 7×10 −6 ft.

2. The sheet according to claim 1 , wherein said sheet is prepared from a cellulosic furnish.

3. The sheet according to claim 2 , wherein said sheet is an absorbent sheet.

4. The absorbent sheet according to claim 3 , wherein said absorbent sheet is characterized by a wet springback ratio of at least about 0.65.

5. The absorbent sheet according to claim 4 , wherein said absorbent sheet is characterized by a wet springback ratio of between about 0.65 and 0.75.

6. The absorbent sheet according to claim 5 , wherein said absorbent sheet is characterized by a hydraulic diameter of from about 4×10 −6 ft. to about 6×10 −5 ft.

7. The absorbent sheet according to claim 6 , wherein said absorbent sheet is characterized by a hydraulic diameter of between about 4×10 −6 ft and 8×10 −6 ft.

8. The absorbent sheet according to claim 6 , wherein said absorbent sheet is characterized by a hydraulic diameter of up to about 7×10 −6 ft.

9. An absorbent cellulosic sheet formed from a furnish comprising recycle fiber having a void volume fraction of from about 0.55 to about 0.70 characterized in that said sheet exhibits a wet springback ratio of at least about 0.6 and a hydraulic diameter of from about 4×10 −6 to about 5×10 −5 ft.

10. The absorbent sheet according to claim 9 , wherein the recycled fiber in said absorbent sheet comprises at least about 50 percent by weight of the fiber in the sheet.

11. The absorbent sheet according to claim 10 , wherein the recycled fiber in said absorbent sheet comprises at least about 75 percent by weight of the fiber in the sheet.

12. The absorbent sheet according to claim 11 , wherein the cellulosic fiber present in said absorbent sheet consists essentially of recycled fiber.

13. An absorbent cellulosic sheet wherein airflow through said sheet exhibits a characteristic Reynolds Number based on flow parameters in the sheet of less than about 1 and a characteristic dimensionless throughdrying coefficient based on flow parameters in the sheet of from about 4 to about 10 and wherein said absorbent sheet is characterized by a wet springback ratio of at least about 0.6.

14. The absorbent cellulosic sheet according to claim 13 , wherein the absorbent sheet is characterized by a wet springback ratio of at least about 0.65.

15. The absorbent cellulosic sheet according to claim 13 , wherein said absorbent sheet comprises recycled fiber.

16. The absorbent cellulosic sheet according to claim 14 , wherein the recycled fiber in said absorbent sheet comprises at least about 50 percent by weight of the fiber present in the sheet.

17. The absorbent cellulosic sheet according to claim 15 , wherein the recycled fiber present in said absorbent sheet comprises at least about 75 percent by weight of the fiber present in the sheet.

Assignments (7)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 29, 2018
From: GEORGIA-PACIFIC CONSUMER PRODUCTS LP
To: GPCP IP HOLDINGS LLC
Reel/Frame 045188/0257 →
RELEASE OF SECURITY AGREEMENT Recorded May 16, 2013
From: CITICORP NORTH AMERICA, INC.
To: GEORGIA-PACIFIC LLC, DELAWARE LIMITED PARTNERSHIP; GEORGIA-PACIFIC CONSUMER PRODUCTS LP, DELAWARE LIMITED LIABILITY COMPANY; GEORGIA-PACIFIC CORRUGATED LLC, DELAWARE LIMITED LIABILITY COMPANY; DIXIE CONSUMER PRODUCTS LLC, DELAWARE LIMITED LIABILITY COMPANY; GEORGIA-PACIFIC GYPSUM LLC, DELAWARE LIMITED LIABILITY COMPANY; GEORGIA-PACIFIC CHEMICALS LLC, DELAWARE LIMITED LIABILITY COMPANY; GEORGIA-PACIFIC WOOD PRODUCTS LLC, DELAWARE LIMITED LIABILITY COMPANY; COLOR-BOX LLC, DELAWARE LIMITED LIABILITY COMPANY; GP CELLULOSE GMBH, ZUG, SWITZERLAND LIMITED LIABILITY COMPANY
Reel/Frame 030669/0958 →
CORRECTIVE ASSIGNMENT TO CORRECT THE ASSIGNEE NAME PREVIOUSLY RECORDED ON REEL 023304 FRAME 0579. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNEE NAME TO BE GEORGIA-PACIFIC CONSUMER OPERATIONS LLC. Recorded Oct 1, 2009
From: GEORGIA-PACIFIC CONSUMER PRODUCTS LLC
To: GEORGIA-PACIFIC CONSUMER OPERATIONS LLC
Reel/Frame 023304/0788 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 1, 2009
From: GEORGIA-PACIFIC CONSUMER OPERATIONS LLC
To: GEORGIA-PACIFIC CONSUMER PRODUCTS LP
Reel/Frame 023304/0796 →
CHANGE OF NAME Recorded Sep 30, 2009
From: GEORGIA-PACIFIC CONSUMER PRODUCTS LLC
To: GEORGIA-PACIFIC CONSUMER PRODUCTS LP
Reel/Frame 023304/0579 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 12, 2007
From: GEORGIA-PACIFIC CORPORATION
To: GEORGIA-PACIFIC CONSUMER PRODUCTS LLC
Reel/Frame 018875/0874 →
SECURITY AGREEMENT Recorded Feb 23, 2006
From: ASHLEY, DREW & NORTHERN RAILWAY COMPANY; BROWN BOARD HOLDING, INC.; CP&P, INC.; COLOR-BOX, LLC; FORT JAMES CORPORATION; FORT JAMES MAINE, INC.; FORT JAMES OPERATING COMPANY; FORT JAMES GREEN BAY L.L.C.; PRIM COMPANY L.L.C.; KMHC, INCORPORATED; GEORGIA-PACIFIC FOREIGN HOLDINGS, INC.; GEORGIA-PACIFIC RESINS, INC.; GEORGIA-PACIFIC WEST, INC.; GEORGIA-PACIFIC FINANCE, LLC; GREAT NORTHERN NEKOOSA CORPORATION; LEAF RIVER FOREST PRODUCTS, INC.; NEKOOSA PACKAGING CORPORATION; MILLENNIUM PACKAGING SOLUTIONS, LLC; SOUTHWEST MILLWORK AND SPECIALTIES, INC.; WEST GEORGIA MANUFACTURING COMPANY; BLUE RAPIDS RAILWAY COMPANY; BRUNSWICK PULP LAND COMPANY, INC.; CECORR, INC.; ENCADRIA STAFFING SOLUTIONS, INC.; FORT JAMES INTERNATIONAL HOLDINGS, LTD.; GEORGIA-PACIFIC INVESTMENT, INC.; FORT JAMES CAMAS L.L.C.; FORT JAMES NORTHWEST L.L.C.; G-P GYPSUM CORPORATION; GEORGIA-PACIFIC CHILDCARE CENTER, LLC; GEORGIA-PACIFIC HOLDINGS, INC.; G-P OREGON, INC.; GEORGIA-PACIFIC ASIA, INC.; GLOSTER SOUTHERN RAILROAD COMPANY; GREAT SOUTHERN PAPER COMPANY; OLD PINE BELT RAILROAD COMPANY; NEKOOSA PAPERS INC.; TOMAHAWK LAND COMPANY; XRS, INC.; PHOENIX ATHLETIC CLUB, INC.; KOCH RENEWABLE RESOURCES, LLC; KOCH FOREST PRODUCTS HOLDING, LLC; KOCH WORLDWIDE INVESTMENTS, INC.; OLD AUGUSTA RAILROAD, LLC; BRUNSWICK CELLULOSE, INC.; LEAF RIVER CELLULOSE, LLC; KOCH CELLULOSE AMERICA MARKETING, LLC; KOCH CELLULOSE, LLC; BLUEYELLOW, LLC
To: CITICORP NORTH AMERICA, INC.
Reel/Frame 017626/0205 →