PROCEDE DE FABRICATION DE PAPIER ET CARTON ET NOUVEAUX AGENTS DE RETENTION CORRESPONDANTS, ET PAPIERS ET CARTONS AINSI OBTENUS

摘要

The invention relates to an improved method for manufacturing paper using a cross-linked polymer as a main retaining agent, whereby said polymer is prepared in an invert emulsion and sheared before it is introduced into the fibrous matter and bentonite is used as a secondary retaining agent (dual-type system). No obligatory stage involving a significant amount of shearing of the fibrous suspension (or matter) separates the two additions. The paper manufacturer is therefore no longer subjected to constraints caused by pulp shearing. A significant improvement in the retention of fines is achieved. Dewatering is also improved to a significant extent. Furthermore, the bentonite content of white water is reduced and an excellent formation is maintained.