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US 6,432,267 B1Granted
Wet crepe, impingement-air dry process for making absorbent sheet
AssigneeGeorgia-Pacific Corporation
InventorGary M. Watson
Life of this patent
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Abstract
A wet crepe, impingement-air dried process for producing absorbent paper sheet is disclosed. In preferred embodiments, the process utilizes recycle furnish and the web is delaminated as it is wet-creped from a Yankee dryer. Particular embodiments include high consistency (after-crepe) wet-shaping prior to impingement air drying on a drilled vacuum roll.
Claims38
A method of making absorbent sheet from cellulosic fiber comprising the steps of:
- (a) depositing an aqueous cellulosic furnish on a foraminous support;
- (b) dewatering said furnish to form a cellulosic web;
- (c) applying said dewatered web to a heated rotating cylinder and drying said web to a consistency of greater than about 40 percent and less than about 80 percent;
- (d) creping said web from said heated cylinder at said consistency of greater than about 40 percent and less than about 80 percent, and optionally wet shaping said web wherein said web is rendered suitable for impingement-air drying;
- and
- (e) drying said web with an impinging heated gaseous medium subsequent to creping said web from said heated cylinder to form said absorbent sheet.
3 more elements
A method of making absorbent sheet from cellulosic fiber comprising:
- (a) depositing an aqueous cellulosic furnish on a foraminous support;
- (b) compactively dewatering said furnish to form a web;
- (c) applying said web to a heated rotating cylinder;
- (d) maintaining the surface of said rotating cylinder at an elevated temperature relative to its surroundings so as to produce a moisture gradient over the thickness of said web;
- (e) drying said web on said cylinder to a consistency of between about 40 and about 80 percent;
- (f) creping said web from said cylinder, wherein s aid creping is operative to delaminate said web and optionally wet-shaping said web wherein said web is suitable for impingement-air drying;
- and
- (g) drying said web with an impinging heated gaseous medium to form a finished product.
5 more elements
Dependencies are inferred from the claim text.