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 2334196
The invention concerns an improved method for making paper which consists in using as main retention agent a branched polymer prepared in invert emulsion and bentonite as secondary retention agent (dual type system). The two additions are separated by a step for shearing the fibrous suspension (or mass). The invention enables to obtain a highly improved retention and also highly improved dewatering. Moreover, it enables to reduce the bentonite content in the white water.
L'invention concerne un procédé amélioré de fabrication du papier, selon lequel on utilise comme agent de rétention principal un polymère ramifié préparé en émulsion inverse et ensuite de la bentonite comme agent secondaire de rétention (système de type dual). Les deux additions sont séparées par une étape de cisaillement de la suspension (ou masse) fibreuse. 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.
Hund Rene
Jehn-Rendu Christian
Heenan Blaikie Llp
S.p.c.m. Sa
Snf S.a.
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