Patent ID: 7045027
Filing Date: 2006-05-16
Classification: B27N

Abstract:
1. A method of producing a fiber board comprising: (a) a separating process of a bast portion wherein the bast portion of a kenaf is separated from a stem core portion, (b) a fiberizing process wherein kenaf fibers are obtained from the bast portion of the kenaf by defibrating the bast portion of the kenaf, (c) a preparing process of a mat wherein the kenaf fibers obtained by said defibrating treatment are aggregated to form a fiber mat comprising kenaf fibers having an average length of 10–200 mm and an average diameter of 10–300 μm, (d) a supplying process of an adhesive agent wherein the fiber mat is impregnated with a thermosetting adhesive agent by supplying the thermosetting adhesive agent into the fiber mat, wherein the thermosetting adhesive agent is a phenolic resin having an average molecular weight of 400–700, said phenolic resin comprising 10–40 percent by weight of monomer and 60–90 percent by weight of polymer having an average molecular weight of 200–2,000, (e) a drying process of the adhesive agent wherein the fiber mat impregnated with the thermosetting adhesive agent is dried in an atmosphere of 120° C. or less while an inner portion of the fiber mat is sucked from one side thereof, and (f) a molding process wherein the fiber mat obtained in the drying process of the adhesive agent is molded by heating said fiber mat under pressure to form a fiber board having a density of 600–900 kg/m