Low compaction, pneumatic dewatering process for producing...

Details Low compaction, pneumatic dewatering process for producing... Low compaction, pneumatic dewatering process for producing...

2005-06-27

2008-08-26

Hug, Eric (Department: 1791)

Paper making and fiber liberation

Processes and products

Non-uniform, irregular or configured web or sheet

C162S109000, C162S113000, C162S116000, C162S205000, C162S207000

Reexamination Certificate

active

07416637

ABSTRACT:
A low-compaction method of making an absorbent cellulosic web includes: forming a nascent web from a papermaking furnish; dewatering the nascent web to a consistency of from about 10 to about 30 percent on a foraminous forming support traveling at a first speed; rush-transferring the web at a consistency of from 10 to about 30 percent to an open texture fabric traveling at a second speed slower than the first speed of the forming support; further dewatering the web on the impression fabric to a consistency of from about 30 to about 60 percent by way of (i) combining the open texture fabric bearing said web with a fluid distribution membrane and an anti-rewet felt as the three pass through a nip into a pressure chamber defined in part by a plurality of nip rolls, the fluid distribution membrane bearing against the side of the open texture fabric away from the web, with the anti-rewet felt bearing against the web, and (ii) applying a pneumatic pressure gradient from the distributor membrane through the web thereby dewatering the web; and drying the web. Preferably the process includes the steps of selecting the papermaking furnish and controlling the process such that the dried web has a void volume fraction of at least 0.7, a hydraulic diameter in the range of from about 3 to about 20 microns and a Wet Springback Ratio of at least about 0.65. Optionally provided is a high solids fabric crepe in a pressure nip.

REFERENCES:
patent: 3058873 (1962-10-01), Keim et al.
patent: 3556932 (1971-01-01), Coscia et al.
patent: 3556933 (1971-01-01), Williams et al.
patent: 3700623 (1972-10-01), Keim
patent: 3772076 (1973-11-01), Keim
patent: 3974025 (1976-08-01), Ayers
patent: 3994771 (1976-11-01), Morgan, Jr. et al.
patent: 4102737 (1978-07-01), Morton
patent: 4225382 (1980-09-01), Kearney et al.
patent: 4239065 (1980-12-01), Trokhan
patent: 4420372 (1983-12-01), Hostetler
patent: 4440597 (1984-04-01), Wells et al.
patent: 4445638 (1984-05-01), Connell et al.
patent: 4482429 (1984-11-01), Klowak
patent: 4490925 (1985-01-01), Smith
patent: 4528316 (1985-07-01), Soerens
patent: 4529480 (1985-07-01), Trokhan
patent: 4543156 (1985-09-01), Cheshire et al.
patent: 4551199 (1985-11-01), Weldon
patent: 4605702 (1986-08-01), Guerro et al.
patent: 4689119 (1987-08-01), Weldon
patent: 4720383 (1988-01-01), Drach et al.
patent: 4834838 (1989-05-01), Klowak
patent: 4849054 (1989-07-01), Klowak
patent: 5223096 (1993-06-01), Phan et al.
patent: 5262007 (1993-11-01), Phan et al.
patent: 5264082 (1993-11-01), Phan et al.
patent: 5312522 (1994-05-01), Phan et al.
patent: 5415737 (1995-05-01), Phan et al.
patent: 5449026 (1995-09-01), Lee
patent: 5593545 (1997-01-01), Rugowski et al.
patent: 5607551 (1997-03-01), Farrington, Jr. et al.
patent: 5690149 (1997-11-01), Lee
patent: 5961782 (1999-10-01), Luu et al.
patent: 6080279 (2000-06-01), Hada et al.
patent: 6083346 (2000-07-01), Hermans et al.
patent: 6093284 (2000-07-01), Hada et al.
patent: 6096169 (2000-08-01), Hermans et al.
patent: 6133405 (2000-10-01), Allen
patent: 6143135 (2000-11-01), Hada et al.
patent: 6161303 (2000-12-01), Beck
patent: 6190506 (2001-02-01), Beck
patent: 6207011 (2001-03-01), Luu et al.
patent: 6228220 (2001-05-01), Hada et al.
patent: 6248203 (2001-06-01), Beck
patent: 6274042 (2001-08-01), Beck
patent: 6280573 (2001-08-01), Lindsay et al.
patent: 6287426 (2001-09-01), Edwards et al.
patent: 6287427 (2001-09-01), Beck
patent: 6306257 (2001-10-01), Hada et al.
patent: 6350349 (2002-02-01), Hermans et al.
patent: 6381868 (2002-05-01), Grabscheid et al.
patent: 6416631 (2002-07-01), Beck
patent: 6419793 (2002-07-01), Beck
patent: 6432267 (2002-08-01), Watson
patent: 6447640 (2002-09-01), Watson et al.
patent: 6454904 (2002-09-01), Hermans et al.
patent: 6497789 (2002-12-01), Hermans et al.
patent: 6562198 (2003-05-01), Beck et al.
patent: 6579418 (2003-06-01), Lindsay et al.
patent: 6589394 (2003-07-01), Beck
patent: 6616812 (2003-09-01), Beck
patent: 6645420 (2003-11-01), Beck
patent: 6855227 (2005-02-01), Beck
patent: 2003/0056919 (2003-03-01), Beck
patent: 2003/0056921 (2003-03-01), Beck et al.
patent: 2003/0056922 (2003-03-01), Beck
patent: 2003/0056923 (2003-03-01), Beck
patent: 2003/0056925 (2003-03-01), Beck
patent: 2003/0146581 (2003-08-01), Beck
patent: 2003/0153443 (2003-08-01), Beck
patent: 2004/0089168 (2004-05-01), Beck
patent: 2006/0289133 (2006-12-01), Yeh et al.
patent: 2053505 (1992-04-01), None
patent: WO 00/14330 (2000-03-01), None
Chapter 2: Alkaline-Curing Polymeric Amine-Epichlorohydrin by Espy in Wet Strength Resins and Their Application (L. Chan, Editor, 1994); Westfelt in Cellulose Chemistry and Technology vol. 13, p. 813, 1979; Evans, Chemistry and Industry, Jul. 5, 1969, pp. 893-903; Egan, J.Am. Oil Chemist's Soc., vol. 55 (1978), pp. 118-121; and Trivedi et al., J.Am.Oil Chemist's Soc., Jun. 1981, pp. 754-756.
U.S. Appl. No. 11/867,113, filed Oct. 4, 2007, Kokko et al.
U.S. Appl. No. 11/804,246, filed May 16, 2007, Edwards et al.
U.S. Appl. No. 11/678,669, filed Feb. 26, 2007, Chou et al.
U.S. Appl. No. 60/903,789, filed Feb. 27, 2007, Chou et al.
U.S. Appl. No. 60/881,310, filed Jan. 19, 2007, Sumnicht.

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