Water resistant paperboard and method of making same
AssigneeBrown & Williamson Tobacco Corporation
InventorF. Kelley St. Charles
Life of this patent
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Abstract
A paper sheet or paperboard, such as boxboard, cardboard and the like has one surface coated with a surfactant to prevent, or at least retard the penetration of moisture through the thickness of the paperboard to the other surface thereof. A method of making a paper sheet or paperboard which has an improved resistance to or retards the penetration of moisture through the thickness of the paperboard comprises the sequential steps of applying a thin coating of a surfactant to one surface of the paperboard, and immediately drying the coated surfactant on the paperboard.
Claims7
A method of treating paperboard to retard the penetration of moisture therethrough comprising the steps of:
- applying a thin coating of a surfactant to at least one surface of the paperboard, said surfactant extending only partially through said paperboard in an amount sufficient to retard penetration of moisture;
- and,
- immediately drying the coated surfactant coating on the paperboard.
A method of treating paperboard to retard the penetration of moisture therethrough comprising the steps of:
- diluting a surfactant in water to form a specific weight percent solution;
- applying a thin coating of a surfactant to at least one surface of the paperboard using a gravure cylinder having a 30 micron cell depth, said surfactant extending only partially through said paperboard in an amount retard penetration of moisture;
- and,
- immediately drying the coated surfactant coating on the paperboard.
Dependencies are inferred from the claim text.