Abstract: A method for machining a board includes forming a backup board, supporting the board by the backup board and machining the board while the board is supported by the backup board. The backup board has a fibrous layer and a surface layer formed on one side of the fibrous layer, the surface layer being in contact with the board during said supporting machining the board. The backup board is formed by: forming an impregnated fibrous mat by impregnating a thermosetting adhesive into a fibrous mat of the kenaf fibers, the kenaf fibers; forming the fibrous layer having a density of about 600-900 kg/m3 by curing the impregnated fibrous mat; forming a resin paper by impregnating a thermosetting resin into a paper; and forming the surface layer on said one side of the fibrous layer by curing the resin paper.

Abstract: A backup board for use in a machining process includes a fibrous layer, at least one side of the fibrous layer being provided with a surface layer adhered and laminated thereon, wherein the surface layer is made of a cured paper impregnated with a thermosetting resin. The fibrous layer has a density of about 600˜900 kg/m3 and includes kenaf fibers adhered together by impregnating a thermosetting adhesive into a fibrous mat of the kenaf fibers, the kenaf fibers having an average length of about 10˜200 mm and an average diameter of about 10˜300 ?m.

Abstract: A fiber board, comprising: kenaf fibers having an average length of 10 to 200 mm and an average diameter of 10 to 300 ?m, and a thermosetting adhesive agent, the fiber board having a density of 600 to 900 kg/m3, being excellent in strength and moisture permeability.

Abstract: The present invention relates to a method of producing a fiber board characterized in that it comprises the following processes (a)–(f): (a) a separating process of a bast portion, (b) a fiberizing process by defibrating the bast portion of the kenaf, (c) a preparing process of a mat comprising the kenaf fibers having an average length of 10–200 mm and an average diameter of 10–300 ?m, (d) a supplying process of an adhesive agent into the fiber mat, (e) a drying process of the adhesive agent, and (f) a molding process by heating said fiber mat under pressure to form a fiber board having a density of 600–900 kg/m3.

Abstract: A backup board for use in a machining process includes a fibrous layer, at least one side of the fibrous layer being provided with a surface layer adhered and laminated thereon, wherein the surface layer is made of a cured paper impregnated with a thermosetting resin. The fibrous layer has a density of about 600˜900 kg/m3 and includes kenaf fibers adhered together by impregnating a thermosetting adhesive into a fibrous mat of the kenaf fibers, the kenaf fibers having an average length of about 10˜200 mm and an average diameter of about 10˜300 ?m.

Abstract: A fiber board, comprising:

Abstract: The present invention relates to a method of producing a fiber board characterized in that it comprises the following processes (a)-(f):

Abstract: A sound absorptive material has powder particles having a sound absorption characteristics at a low frequency and generally supported in a vibratable state by a porous support, whereby the sound absorptive material can be increased in the sound absorption coefficient in the low frequency range while maintaining the absorptive material to be thin.