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US 5,718,785 AGranted
Glass mat with reinforcing binder
AssigneeGeorgia-Pacific Corporation
InventorBrian G. Randall
Life of this patent
Estimating the term…
Abstract
In a gypsum board faced with a fibrous mat, for example, a mat of glass filaments adhesively bound together, improvements are realized by the use of a reinforcing binder in the mat.
Claims11
A process for manufacturing in continuous fashion a fibrous mat-faced gypsum board comprising:
- (a) providing an aqueous slurry of calcined gypsum on an underlying facing sheet;
- (b) forming said slurry into a shape and maintaining said shape while said calcined gypsum sets to form a wet board;
- (c) applying to the top surface of said wet board an overlying facing sheet, at least one of said facing sheets comprising a porous fibrous mat of predetermined thickness and comprising fibers bound together by an adhesive;
- (d) allowing said slurry to penetrate into said mat such that at least a portion of the outer surface of said mat is substantially free of set gypsum;
- (e) applying to the outer surface of said mat reinforcing resinous binder in an amount of at least about three g/m.sup.2 ;
- and
- (f) drying the wet board, thereby forming board comprising a set gypsum core having adhered to one surface thereof said facing sheet and to the other surface thereof said mat.
4 more elements
Dependencies are inferred from the claim text.