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US 5,316,624 AGranted
Method and apparatus for high density paper
AssigneeStone-Consolidated Inc.
InventorJean-Guy Racine
Life of this patent
Estimating the term…
Abstract
A method and apparatus to produce a relatively dense high quality paper suitable for multi-color printing are provided. The paper web is super/soft-calendered while at a moisture content of between about 15 to about 55% and the web is subsequently treated to further reduce its moisture content. This procedure prevents galvanizing of the sheet which normally would occur using prior art techniques.
Claims12
A process for making paper which is adapted to receive print or graphics which process comprises the steps:
- (1) preparing a pulp furnish of fibers,
- (2) providing a pressed wet paper web prepared from said furnish having a moisture content greater than 15% by weight,
- (3) soft calendering said wet paper web while maintaining the moisture content of said web at a level greater than 15% by weight, said soft calendering occurring at a calendering pressure and temperature sufficient to increase the density of the web by at least about 10% yet insufficient to cause galvanizing of the paper web, and
- (4) subsequently treating said calendered web to further reduce its moisture content.
1 more element
Dependencies are inferred from the claim text.