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    BOARD WITH FIBER-REINFORCED DENSE LAYER
    4.
    发明申请
    BOARD WITH FIBER-REINFORCED DENSE LAYER 有权

    公开(公告)号：US20230021340A1

    公开(公告)日：2023-01-26

    申请号：US17855732

    申请日：2022-06-30

    Applicant: United States Gypsum Company

    Inventor： Annamaria VILINSKA ,  Mark K. HEMPHILL ,  Yijun SANG ,  Nicholas S. JONES ,  Kevern O. FRASER ,  Jon CROSS ,  Te Hua LAU

    IPC: C04B40/00 ,  C04B28/14 ,  B28C5/02 ,  B28B19/00 ,  B28C5/40

    Abstract: Disclosed is a composite gypsum board comprising a set gypsum core disposed between face (e.g., Manila) and back (e.g., Newsline) cover sheets. The set gypsum core is formed from a core slurry comprising stucco, water, and optional additives, such as foaming agent, migrating starch, accelerator, retarder, dispersant, etc. A dense layer formed from a dense layer slurry comprising stucco, water, fiber (e.g., paper fiber), and optionally, strength-enhancing starch, is disposed between the core and the face paper. The dense layer slurry contains a greater concentration of fiber, and optionally, strength-enhancing starch, than the core slurry, but the concentration of one or more other additives (e.g., accelerator, retarder, dispersant, or combinations thereof) is lower or the same in the dense slurry as compared with the core slurry. Also disclosed is a method of making board using one board mixer. In embodiments, paper fiber is added to water to form a suspension. The suspension is introduced, while in a non-laminar state, into the dense slurry. Further disclosed is apparatus, such as an extractor and an additive injection system, which can be a part of a cementitious slurry mixing and dispensing assembly.

    MULTI-LAYER GYPSUM BOARD AND RELATED METHODS AND SLURRIES
    6.
    发明申请
    MULTI-LAYER GYPSUM BOARD AND RELATED METHODS AND SLURRIES 审中-公开

    公开(公告)号：US20190352233A1

    公开(公告)日：2019-11-21

    申请号：US16401915

    申请日：2019-05-02

    Applicant: United States Gypsum Company

    Inventor： Annamaria VILINSKA ,  Alfred C. Li

    IPC: C04B28/14 ,  C04B16/02 ,  B32B13/08 ,  B32B29/00

    Abstract: Disclosed is a composite gypsum board comprising a board core and a concentrated layer, as well as related methods of preparing board and slurries. The board core and the concentrated layer both are formed from water and stucco. The concentrated layer is designed to have higher density and/or nail pull than the core. The concentrated layer is further formed from a polysaccharide that forms a complex with calcium ions, e.g., an alginate compound such as sodium alginate. In some embodiments, the concentrated layer is formed from an enhancing additive to enhance strength therein, while the core is formed without using enhancing additive or less enhancing additive than used in forming the board core.

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