公开(公告)号：US20220356650A1

公开(公告)日：2022-11-10

申请号：US17619145

申请日：2020-05-07

申请人： SPCM SA

发明人： Cyril BARRIERE ,  Rémi OLIVIER ,  René HUND

IPC分类号： D21H17/45 ,  D21H21/10 ,  D21H17/43 ,  D21H17/66

摘要： This invention relates to a method for manufacturing a sheet of paper or cardboard, according to which, before forming said sheet, at least one N-vinylformamide polymer that is partially hydrolyzed in the form of an inverse emulsion is added, at one or more injection points, to a fibrous suspension in the presence of an anti-gelling agent, and having a cationic regain between 30 and 150%, the inverse emulsion having a weight ratio of partially hydrolyzed N-vinylformamide polymer to anti-gelling agent in the range between 1,000,000/5000 and 1,000,000/50,000.