Heat treatment of paper products having milk and other additives
First Claim
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1. A method of improving the stiffness, wet strength and opacity of a kraft paper product while maintaining acceptable flexibility thereof, comprising steps ofapplying an additive selected from the group consisting of (a) milk and (b) a mixture of equal proportions of potato starch in 8% aqueous solution and acrylic latex in 50% solution to said product, thenheat treating said product at an internal temperature of at least 400°
- F. for a period of time sufficient to increase the wet strength thereof, and thenrewetting the product immediately after said heat treating step before the product cools substantially.
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Abstract
The stiffness, wet strength and bursting strength of paper is improved by adding a latex such as milk to the paper and then subjecting the paper to steps of high temperature treatment and immediate rewetting.
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4 Claims
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1. A method of improving the stiffness, wet strength and opacity of a kraft paper product while maintaining acceptable flexibility thereof, comprising steps of
applying an additive selected from the group consisting of (a) milk and (b) a mixture of equal proportions of potato starch in 8% aqueous solution and acrylic latex in 50% solution to said product, then heat treating said product at an internal temperature of at least 400° - F. for a period of time sufficient to increase the wet strength thereof, and then
rewetting the product immediately after said heat treating step before the product cools substantially. - View Dependent Claims (2, 3, 4)
- F. for a period of time sufficient to increase the wet strength thereof, and then
Specification