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US 7,682,488 B2Granted
Method of making a paper web containing refined long fiber using a charge controlled headbox
AssigneeGeorgia-Pacific Consumer Products LP
InventorsKang Chang Yeh, Gary L. Worry, Thomas N. Kershaw, Henry S. Ostrowski
Life of this patent
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Abstract
A method of forming a cellulosic web is discussed, the product of which may, for example, possess at least one of increased softness, strength, and absorbency. The method measures the total anionic charge and controls the net charge of an aqueous stream.
Claims20
A method of forming a cellulosic web comprising:
- (a) supplying to a headbox an aqueous stream comprising a major proportion of refined long fiber;
- (b) supplying to the aqueous stream a cationic strength adjusting agent and an anionic strength adjusting agent;
- (c) measuring the total anionic charge carried by the aqueous stream;
- (d) controlling the amount of the cationic strength adjusting agent and the anionic strength adjusting agent so that the net charge of the aqueous stream is maintained in the range of from less than about 0 to about −115 meq×10−6 per 10 ml;
- (e) depositing the aqueous stream on a first moving foraminous support to form a web;
- (f) transferring the web to a second moving foraminous support;
- (f) compressively dewatering the web;
- (g) transferring the web to a Yankee cylinder to dry the web to a consistency of at most about 98%;
- and,
- (i) creping the web from the Yankee cylinder.
7 more elements
A method of forming a cellulosic web comprising:
- (a) supplying to a headbox an aqueous stream comprising a major proportion of refined long fiber;
- (b) supplying to the aqueous stream a cationic strength adjusting agent chosen from polyamide-epihalohydrin resins, polyacrylamide resins, urea-formaldehyde resins, polyacrylamide resins, urea-formaldehyde resins, melamine formaldehyde resins, and mixtures thereof;
- (c) supplying to the aqueous stream an anionic strength adjusting agent chosen from carboxymethyl celluloses, carboxymethyl guar gums, anionic starches, anionic guar gums, anionic polyacrylamides, and mixtures thereof;
- (d) measuring the total anionic charge carried by the aqueous stream;
- (e) controlling the amount of the cationic strength adjusting agent and the anionic strength adjusting agent so that the net charge of the aqueous stream is maintained in the range of from less than about 0 to about −115 meq×10−6 per 10 ml;
- (f) depositing the aqueous stream on a first moving foraminous support to form a web;
- (g) transferring the web to a second moving foraminous support;
- (h) compressively dewatering the web;
- (i) transferring the web to a Yankee cylinder to dry the web to a consistency of at most about 98%;
- and,
- (j) creping the web from the Yankee cylinder.
8 more elements
A method of forming a cellulosic web comprising:
- (a) supplying to a headbox an aqueous stream comprising a major proportion of refined long fiber having an average weight-weighted fiber length of from at least about 2 mm to about 3.5 mm, and a minor portion of a second fiber chosen from hardwood fibers, recycle fibers, secondary fibers, nonwoody fibers eucalyptus fibers, high yield fibers, thermally curled fibers, thermally cross-linked bulking fibers, and mixtures thereof;
- (b) supplying to the aqueous stream a cationic strength adjusting agent chosen from polyamide-epihalohydrin resins, polyacrylamide resins, urea-formaldehyde resins, polyacrylamide resins, urea-formaldehyde resins, melamine formaldehyde resins, and mixtures thereof, in an amount of from about 15 lbs/ton to about 30 lbs/ton of total fiber in the furnish;
- (c) supplying to the aqueous stream an anionic strength adjusting agent chosen from carboxymethyl celluloses, carboxymethyl guar gums, anionic starches, anionic guar gums, anionic polyacrylamides, and mixtures thereof;
- (d) measuring the total anionic charge carried by the aqueous stream;
- (e) controlling the amount of the cationic strength adjusting agent and the anionic strength adjusting agent so that the net charge of the aqueous stream is maintained in the range of from less than about 0 to about −115 meq×10−6 per 10 ml;
- (f) depositing the aqueous stream on a first moving foraminous support to form a web;
- (g) transferring the web to a second moving foraminous support;
- (h) compressively dewatering the web;
- (i) transferring the web to a Yankee cylinder to dry the web to a consistency of at most about 98%;
- and,
- (j) creping the web from the Yankee cylinder.
8 more elements
Dependencies are inferred from the claim text.