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US 4,376,142 AGranted
Method for finishing fiberboard utilizing a frothed prime coat
AssigneeArmstrong World Industries, Inc.
InventorJames A. Allen
Life of this patent
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Abstract
In a method for prime coating fiberboard products the improvement wherein a foaming agent is added to a conventional aqueous latex based prime coating and the coating aerated to give a frothed prime coating having a consistency of 500 to 750 grams per liter, the frothed coating applied to the board product at a rate of 220 to 320 grams per square meter, and heated to collapse the froth and dry the coating.
Claims3
A method for preparing a prime-coated fiberboard product, said method comprising the steps of
- preparing a frothed aqueous latex prime coating comprising a foaming agent, said frothed coating having a consistency of 500 to 750 grams per liter,
- applying said coating at a rate of 220 to 320 grams per square meter of fiberboard, and
- exposing the coated fiberboard to heat, thereby collapsing the froth and drying the coating.
Dependencies are inferred from the claim text.