Gypsum board
    73.
    发明授权
    Gypsum board 失效
    石膏板

    公开(公告)号:US5116671A

    公开(公告)日:1992-05-26

    申请号:US711710

    申请日:1991-06-07

    IPC分类号: B32B13/14 C04B28/14 E04C2/04

    摘要: 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.

    摘要翻译: 在根据本发明的改进的石膏板中,板在相对的面上具有石膏芯和纤维材料的第一和第二覆盖片。 芯部具有与第一覆盖片平行并相邻的第一层。 该层不含纤维材料的任何纤维。 该第一层具有比板的芯的中心部分相对较少的空隙和明显更大的密度。 芯的中心部分具有基本均匀分布在芯的整个中心部分的多个相对大的离散空隙。 这些空隙具有基本上球形的相干壁。