Fiber reinforced plastic articles and method of preparation
AssigneeNational Gypsum Company
InventorsDonald R. Kole, Walter E. Voisinet
Life of this patent
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Abstract
A composition board consisting essentially of a resin binder in the amount of between about 10 and 45 percent by weight and filler materials in the amount of between about 90 and 55 percent by weight and having a cross section of varying depth formed as a result of differentially compacting a dry blank to a thickness which is between about 30 and 70 percent of the original thickness at an average pressure of between about 600 psi and 1500 psi at an elevated temperature which is between about 275.degree. F. and 350.degree. F. so as to cause portions which were compacted to a greater degree to exhibit a darker color than portions which were compacted to a lesser degree to thereby produce a tonal effect on said composition board.
Claims20
A method of making a board having a design impressed on the surface thereof with the design having a tonal effect with portions of different darkness comprising the steps of wet-forming a board from a mixture of a resin binder and reinforcing fibers and filler materials, drying the wet-formed board so as to remove substantially all the water therefrom, heating the dried wet-formed board within a predetermined range of elevated temperatures, pressing said board within said elevated temperature range to increase the reinforcement material resin bond, and impressing a design into said board by compacting the heated dried wet-formed board different amounts by a press element having a design surface within said elevated temperature range to cause the portions which were compacted greater amounts to have a darker coloration than the portions which were compacted lesser amounts solely as a result of compacting said board said different amounts, with the coloration of each portion extending uniformly throughout the thickness of the board.
Dependencies are inferred from the claim text.