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US 4,818,342 AGranted
Heat treatment of paper products
AssigneeInternational Paper Company
InventorsDinkar G. Wagle, Vacheslav M. Yasnovsky, Jerome M. Floyd
Life of this patent
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Abstract
The stiffness and wet strength of paper products are improved by subjecting the products to high temperature treatment, immediately followed by rewetting. The resultant products have good folding endurance.
Claims3
A method of improving the stiffness and strength of a kraft paper product while maintaining acceptable flexibility thereof comprising steps of
- heat treating incompletely dried or moisturized paper product, at high temperature within the range of 284.degree. F. to 482.degree. F. for 0.5 seconds to 120 seconds, and then
- rewetting the surface of said product immediately following said heat treating step, said product being maintained above 212.degree. F. during the interval between the heat treating and rewetting steps.
Dependencies are inferred from the claim text.