Method for manufacturing paper using a cationic polymer obtained by hofmann degradation
AssigneeS.P.C.M. SA
InventorsRené Hund, Christophe Auriant
Life of this patent
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Abstract
Process for manufacturing a sheet of paper and/or board, according to which, in a plant comprising a fan pump and a head box: a cellulose fiber suspension is prepared; the white waters are introduced into the thick stock; the mixture is homogenized in the fan pump; the thin stock is transferred to the head box; the sheet is formed and then dried, characterized in that, before homogenization of the mixture in the fan pump, a cationic copolymer obtained by Hofmann degradation reaction is introduced into the white waters and/or the thick stock and/or the mixture formed by the white waters and the thick stock.
Claims20
A process for manufacturing a sheet of paper and/or board, said process comprising, in a plant comprising a fan pump and a head box:
- preparing a cellulose fibre suspension, referred to as thick stock;
- introducing into the thick stock white waters resulting from drainage of the sheet, thereby forming a mixture;
- homogenizing the mixture in the fan pump, thereby forming a thin stock;
- transferring the thin stock resulting from the homogenization to the head box;
- forming the sheet;
- and
- drying the sheet,
- wherein, before homogenizing the mixture in the fan pump, a cationic copolymer obtained by Hofmann degradation reaction is introduced into the white waters and/or the thick stock and/or the mixture formed by the white waters and the thick stock.
Dependencies are inferred from the claim text.