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AssigneeGeorgia-Pacific Corporation
InventorsSteven L. Edwards, Greg A. Wendt, Robert J. Marinack, Michael J. Vander Wielen, Stephen J. McCullough, Jeffrey C. McDowell, Guy H. Super, Gary L. Worry
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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.
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:
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.
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.
Dependencies are inferred from the claim text.