Title:
【発明の名称】木質セメント板
Document Type and Number:
Japanese Patent JP3325005
Kind Code:
B2
Abstract:
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 >=45 μm and <=1,000 μm, preferably >=75 μm and <=1,000 μm particle diameter and fine powder having >=1 μm and <=500 μm, preferably >=1 μm and <75 μm 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.
Inventors:
Fumihiro Asakura
Application Number:
JP31017699A
Publication Date:
September 17, 2002
Filing Date:
October 29, 1999
Export Citation:
Assignee:
Nichiha Co., Ltd.
International Classes:
B32B5/22; B32B13/02; C04B18/16; C04B18/26; C04B28/02; (IPC1-7): C04B28/02; B32B13/02
Domestic Patent References:
| JP9286657A | ||||
| JP6293548A |
Attorney, Agent or Firm:
Tadao Usami