WOOD CEMENT BOARD AND PRODUCTION METHOD THEREOF
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United States of America Patent
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Issued Date -
Oct 6, 2011
app pub date -
Mar 17, 2011
filing date -
Mar 31, 2010
priority date (Note) -
Abandoned
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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.
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