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    Paper having calcium sulfate mineral filler for use in the production of gypsum wallboard
    16.
    发明授权
    Paper having calcium sulfate mineral filler for use in the production of gypsum wallboard 失效
    具有硫酸钙矿物填料的纸用于生产石膏墙板

    公开(公告)号：US4548676A

    公开(公告)日：1985-10-22

    申请号：US621956

    申请日：1984-06-18

    申请人： Norman E. Johnstone ,  John R. Kehoe

    发明人： Norman E. Johnstone ,  John R. Kehoe

    IPC分类号： D21H11/04 ,  D21H11/14 ,  D21H13/40 ,  D21H13/46 ,  D21H17/15 ,  D21H17/67 ,  D21H21/52 ,  E04C2/04 ,  D21H3/02

    CPC分类号： D21H11/14 ,  D21H11/04 ,  D21H13/40 ,  D21H13/46 ,  D21H17/15 ,  D21H17/675 ,  D21H21/52 ,  E04C2/043 ,  Y10T428/31996

    摘要： A composite paper particularly adapted for use as cover sheets in the production of gypsum wallboard, the paper being sufficiently porous to permit better drainage and more rapid drying in the production of the paper, and when applied to the surfaces of a gypsum slurry for forming wallboard, permits less heat to be utilized in the wallboard conversion, thereby saving energy in the board production required for drying the board. The paper comprises in weight percent:(A) cellulosic fibers in an amount of from about 65% to about 90% and preferably having a fiber freeness of from about 300 ml to about 550 ml Canadian Standard Freeness,(B) calcium sulfate as a filler in an amount of from about 10% to about 35%,(C) a binder in an amount from about 1% to about 31/2%,(D) a flocculant in an amount of from about 0.1% to about 0.2%,(E) a buffering agent in an amount from about 0.25% to about 10%,(F) a neutral sizing agent in an effective amount to prevent water penetration,(G) an anionic polymer in an amount suitable for retaining said filler in said paper, and(H) a cationic starch when a succinic anhydride is used as the neutral sizing agent.In a preferred embodiment, after the paper is treated with a neutral internal sizing agent during its formation, it is subsequently treated with a surface sizing agent after formation of the paper, in order to provide certain properties including better adhesion to the gypsum core when used to make gypsum wallboard.

    摘要翻译： 特别适合用作生产石膏墙板的覆盖片的复合纸，该纸具有足够的多孔性，以便能够在纸的生产中更好地排水和更快速的干燥，并且当施加到用于形成墙板的石膏浆料的表面时 允许在壁板转换中使用较少的热量，从而在板干燥所需的板材生产中节省能量。 该纸包括重量百分比：（A）纤维素纤维的量为约65％至约90％，优选纤维游离度为约300ml至约550ml加拿大标准游离度，（B）硫酸钙为 填充剂的量为约10％至约35％，（C）约1％至约31％/ 2％的粘合剂，（D）约0.1％至约0.2％的絮凝剂， ，（E）约0.25％至约10％量的缓冲剂，（F）有效量的防止水渗透的中性施胶剂，（G）适于保持所述填料的量的阴离子聚合物 所述纸和（H）阳离子淀粉，当使用琥珀酸酐作为中性施胶剂时。 在一个优选的实施方案中，在纸形成之后用中性内部施胶剂处理纸之后，随后在形成纸之后用表面施胶剂处理纸，以便提供某些性质，包括当使用时具有对石膏芯的更好粘合性 制作石膏墙板。