Patent ID: 6565923
Filing Date: 2003-05-20
Classification: B27N

Abstract:
A method for manufacturing a reinforced oriented strand board comprising the steps of:a. placing an oriented strand board in an impregnation container having an injecting inlet; b. evacuating air from said impregnation container; c. providing a resin selected from the group consisting of melamine formaldehyde and melamine-urea-formaldehyde; d. injecting only said resin into said impregnation container through said injecting inlets; e. adding pressure to said injected resin and maintaining said pressure for 30 minutes to impregnate said oriented strand board; f. removing excessive resin from said impregnation container; g. evacuating said impregnation container to less than one atmosphere; h. removing said impregnated oriented strand board from said impregnation container and drying said impregnated oriented strand board at approximately 20Â° C. for 3 days; i. heating said dried oriented strand board to 80Â° C. to harden said resin; and, j. drying said heated oriented strand board at approximately 20Â° C. for 48 hours to obtain a strengthened and fire-resistant oriented strand board.