Abstract: A wood cement board having on a surface thereof a rugged pattern has a plurality of layers laminated each having a cement, a silica-containing material, wood fibers and wood flour, wherein the cement and the silica-containing material are contained at a weight ratio ranging from 3:7 to 7:3, the wood flour ranges in size from 0.3 to 1.5 mm and is covered with calcium, and the amount of the wood fibers and the wood flour is not greater than 9 wt % with respect to total solids. Also provided is a method of producing a wood cement board, comprising the steps of covering wood flour ranging in size from 0.3 to 1.5 mm with calcium by mixing the wood flour with a cement composition, or with a cement, or with water resulting from dewatering a slurry, and stirring the mixture in water at a predetermined solids concentration; producing a slurry; producing a laminated mat; and pressing the mat at a pressure not higher than 10 MPa in use of a press, forming thereby a rugged pattern and performing curing.

Abstract: The object of the present invention is to provide a method for the manufacturing of a wood cement board in which the curing of the cement can be smoothly carried out even if the wood reinforcement used originates from a sort of wood containing a large amount of cement curing inhibitor. To attain said object, the present invention provides a method for the manufacturing of a wood cement board including; scattering an ingredient wherein a sodium alum produced from aluminum sulfate and sodium sulfate, and sodium silicate are added to a mixture containing a cementitious inorganic powder and a wood reinforcement on a base panel to form a mat, then primarily curing the said mat by pressing and heating it under its moist points and, then curing the primarily cured mat at room temperature or in an autoclave. In the method, the aluminum sulfate and sodium silicate in the sodium alum improve the primary curing strength of the mat, with sodium sulfate improving the final curing strength of the mat.