发明名称 |
IMPROVED GYPSUM BOARD |
摘要 |
<p>In the improved gypsum board in accordance with this invention, the board has a gypsum core and first and second cover sheets of fibrous material on opposing faces. The core has a first stratum parallel to and adjacent the first cover sheet. This stratum does not contain any fibers of the fibrous material. This first stratum has relatively few voids and a substantially greater density than the central portion of the core of the board. The central portion of the core has a plurality of relatively large discrete voids substantially uniformly distributed throughout the central portion of the core. These voids have substantially spherical coherent walls.</p> |
申请公布号 |
EP0458843(B1) |
申请公布日期 |
1996.08.14 |
申请号 |
EP19900903313 |
申请日期 |
1990.02.14 |
申请人 |
DOMTAR INC. |
发明人 |
BRUCE, ROBERT;MITAKIDIS, DIMITRIOS |
分类号 |
B32B13/14;C04B28/14;C04B38/10;E04C2/04;E04F13/14;(IPC1-7):E04C2/04 |
主分类号 |
B32B13/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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