| 摘要 |
Process for manufacturing paper, board or similar products that consists, separately or in combination, in adding, to the fibrous suspension: - at least one main retention aid composed of a cationic (co)polymer, and at least one dual retention aid composed of a crosslinked cationic (co)polymer obtained in the form of a dispersion and put into solution prior to the introduction thereof into the fibrous suspension with gentle agitation, said crosslinked cationic (co)polymer having - a UL viscosity between 1.3 and 2.7 cps, preferably 1.5 and 2.4 cps, and - an apparent cationicity ratio between 25 and 75%, and, optionally, before or after the dual retention aid or main retention aid, one, or more, tertiary retention aid(s) chosen from the group comprising mineral particles and organic polymers bearing anionic charges. |
