Method for manufacturing paper products
AssigneePaper Chemistry Laboratory, Inc.
InventorsJohn G. Penniman, Maria S. Reichlin
Life of this patent
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Abstract
Novel pulp, paper and paperboard manufacturing methods utilizng non polar organic solvents. These solvents can be introduced into the pressing operation of the pulp, paper, or paperboard making machine or can be substituted for water at any point after the formation stage. The result is a significant saving in dryer energy which can be translated to greater productivity in dryer-limited processes, accompanied by an improvement in tensile strength and other physical properties.
Claims23
A method for increasing the rate of water removal from a web of a paper product during consolidation, pressing and drying which comprises:
- applying at least one non-polar organic solvent to the web after formation but before the web is dried in a drying stage, which solvent is applied in an amount sufficient to at least partially displace water from between the fibers of the web;
- and at least partially displacing water from the web by a pressing stage.
In a paper product manufacturing method which includes the steps of deposting pulp upon a screen to form a web of paper fiber, removing a portion of the water from the deposited web by pressing the web in press means having a press felt surface, and drying the pressed web, the improvement which comprises treating the press felt surface with a sufficient amount of at least one non-polar organic solvent which is subsequently transferred to the web in an amount sufficient to at least partially displace water between the fibers of the web, thereby making the water more readily available for displacement and removal from the web;
- and at least partially displacing water from web during pressing.
In a paper product manufacturing method which includes the steps of depositing pulp upon a screen to form a web of paper fiber, removing a portion of the water from the deposited web by pressing the web in press means, and drying the pressed web, the improvement which comprises increasing the drying rate of the pressed web or increasing the rate of production of the dried web by at least partially displacing water between the fibers of the web with at least one non-polar organic solvent during the pressing stage to obtain a web containing the solvent between the fibers in place of some of the water prior to drying the web.
A method for improving at least one property of a final paper product which comprises treating a fiber web after formation with a sufficient amount of at least one non-polar organic solvent prior to pressing and drying such that during pressing, a portion of the water between the fibers of the web is diplaced by the solvent to obtain greater compaction during pressing, so as to improve at least one property of the final paper product.
A method for improving at least one property of a final paper product or increasing the efficiency of transfer of a property improving additive to said paper product which comprises treating a fiber web after formation and during the pressing stage with a sufficient amount of at least one non-polar organic solvent containing at least one property improving additive, such that, after the pressing operation, a portion of the water between the fibers of the web is displaced by the solvent and additive so as to introduce the additive into the web so that it is enabled to improve at least one property of the final paper product.
Dependencies are inferred from the claim text.