Lauan panel with reduced flame spread rating
AssigneeChampion International Corporation
InventorsJames Cooley, Ozzie Fogle, Hildred Barnes
Life of this patent
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Abstract
The flame spread rating of Lauan plywood panels is reduced significantly by incorporating, just prior to application, a quantity of sodium bicarbonate in dry powder form or slurry and a quantity of a saturated aqueous solution of sodium tetraborate, respectively, in the water base filler and the water base basecoat used to finish the surface thereof.
Claims10
In the method of finishing the surface of Lauan plywood panels by applying in sequence to said surface a water base filler, a groove colorant, a water base basecoat, at least one printing ink, and a topcoat, the improvement of adding just before use to said water base filler about from 30 to 40 percent by weight of sodium bicarbonate in dry powder form or slurry and to said water base basecoat about from 10 to 15 percent by weight of a saturated aqueous solution of sodium tetraborate.
The improvement according to claim 2, wherein said sodium bicarbonate is used in an amount of about 30 percent by weight and said solution of sodium tetraborate is used in an amount of about 10% by weight.
The method for reducing the flame spread rating of Lauan plywood panels which comprises incorporating, just prior to the application thereof, about from 30 to 40 percent by weight of sodium bicarbonate in dry powder form or slurry into a water base filler, and about from 10 to 15 percent by weight of a saturated aqueous solution of sodium tetraborate into a water base basecoat, and finishing the surface of said panels by applying thereto said filler and basecoat.
In a plywood panel comprising a plywood substrate having a first filler layer and a second basecoat layer thereon, the improvement which comprises from about 38 to 51 percent of sodium bicarbonate by weight of cured water-base filler material dispersed in said first layer and from about 1 to 3 percent of borax by weight of cured water-base basecoat material dispersed in said second layer.
Dependencies are inferred from the claim text.