| 摘要 |
<p>PROBLEM TO BE SOLVED: To produce a wood cement board having a high strength and excellent in dimensional stability by effectively utilizing a waste material of the wood cement board. SOLUTION: This wood cement board is obtained by crushing secondary further a primary crushed material obtained by crushing the waste material of wooden pulp cement by a hammer mill, with a roller mill, classifying the secondary crushed material to coarse powder having >=45μm and <=1,000μm, preferably >=75μm and <=1,000μm particle diameter and fine powder having >=1μm and <=500μm, preferably >=1μm and <75μm particle diameter and using the coarse particle as a raw material of surface and rear layers of the wood cement board and the fine powder as the raw material for the core layer.</p> |
