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    METHOD FOR MANUFACTURING PAPER AND CARDBOARD
    1.
    发明公开
    METHOD FOR MANUFACTURING PAPER AND CARDBOARD 审中-公开

    公开(公告)号：US20230295877A1

    公开(公告)日：2023-09-21

    申请号：US18006280

    申请日：2021-06-24

    申请人： SPCM SA

    发明人： Gatien FAUCHER ,  Damien FOUGEROUSE

    IPC分类号： D21H21/10 ,  D21H17/43 ,  D21H17/45 ,  D21H23/06 ,  D21H17/66 ,  D21H17/67 ,  D21H17/00

    CPC分类号： D21H21/10 ,  D21H17/43 ,  D21H17/455 ,  D21H23/06 ,  D21H17/66 ,  D21H17/675 ,  D21H17/74

    摘要： This invention relates to a method for manufacturing a sheet of paper or cardboard, comprising the addition of a water-soluble polymer P with a weight-average molecular weight greater than 750,000 Dalton to a fibrous suspension. This method comprises the following successive steps:



    preparing an aqueous solution A containing at least one water-soluble polymer P at a concentration C of between 0.1 and 0.5% by weight, said polymer P having a factor F(C) strictly greater than 4, with F(C)=Δ600/C, Δ600 being the slope to reach 90% of the viscosity developed by aqueous solution A at 600 seconds at 25° C., obtained from the viscosity curve of aqueous solution A as a function of time, at the given concentration C, at 25° C.,
    adding aqueous solution A to the fibrous suspension, at one or more injection points,
    forming a sheet of paper or cardboard.