D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
D21H 23/76 (2006.01) D21H 17/37 (2006.01) D21H 17/68 (2006.01) D21H 21/10 (2006.01) D21H 23/14 (2006.01)
Patent
CA 2334744
The invention relates to an improved paper production process according to which a cross-linked polymer prepared in reverse-phase emulsion and sheared before introduction into the fibrous mass is used as the main retention aid, and then bentonite is used as the secondary retention aid (a dual type system). The two additions are not separated by any mandatory stage for intense shearing of the fibrous suspension (or mass). The paper manufacturer can therefore be free from the constraints of shearing the pulp. A distinctly improved retention of the fines is obtained, and also a distinct improvement in drainage. In addition, the bentonite content in the white water is reduced. Lastly, excellent formation is maintained.
L'invention concerne un procédé amélioré de fabrication du papier, selon lequel on utilise comme agent de rétention principal un polymère réticulé préparé en émulsion inverse et cisaillé avant l'introduction dans la masse fibreuse, et ensuite de la bentonite comme agent secondaire de rétention (système de type dual). Les deux additions ne sont séparées par aucune étape obligatoire de cisaillement important de la suspension (ou masse) fibreuse. Le papetier peut donc s'affranchir des contraintes du cisaillement de la pâte. On obtient une rétention nettement améliorée des fines et également une nette amélioration de l'égouttage. On réduit de plus la teneur en bentonite dans les eaux blanches. Enfin, on maintient une excellente formation.
Hund Rene
Jehn-Rendu Christian
Smart & Biggar
Snf S.a.
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