Method and apparatus for high density paper
First Claim
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1. 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.
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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.
38 Citations
12 Claims
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1. A process for making paper which is adapted to receive print or graphics which process comprises the steps:
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(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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification