Process for making paper

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 23/04 (2006.01) D21H 13/48 (2006.01) D21H 17/67 (2006.01) D21H 17/37 (2006.01) D21H 17/45 (2006.01) D21H 21/10 (2006.01)

Patent

CA 2409047

Methods of making paper or paperboard are described. According to one method, fibrous cationic colloidal alumina microparticles and a polymer are introduced to a papermaking pulp to form a treated pulp having improved retention properties. The fibrous cationic colloidal alumina microparticles are preferably a fibrous cationic acetate salt of boehmite alumina having a zeta potential of greater than about 25 and a weight ratio of alumina to acetate of less than about 4. The polymer can be a cationic polymer, a nonionic polymer, an amphoteric polymer under cationic conditions, or combinations thereof. The pulp may also be treated with at least one coagulant, at least one flocculant, at least one cationic starch, at least one cellulytic enzyme, and/or other conventional papermaking pulp additives. The resulting pulp is formed into a sheet of pulp and then drained to form a paper or paperboard. Other papermaking processes are also described as is a papermaking apparatus for carrying out the methods. Paper and paperboard containing dried pulp that has been treated with fibrous cationic colloidal alumina microparticles and polymer are also described.

L'invention concerne des procédés servant à fabriquer du papier ou du carton. Un de ces procédés consiste à introduire dans la pâte à papier des microparticules fibreuses d'alumine colloïdale cationique et un polymère, de manière à obtenir une pâte à papier traitée possédant des propriétés améliorées de rétention. Ces microparticules fibreuses d'alumine colloïdale cationique consistent, de préférence, en un sel acétate cationique fibreux d'alumine de boehmite possédant un potentiel zêta supérieur à 25 et un rapport de poids entre alumine et acétate inférieur à 4. Le polymère peut être un polymère cationique, un polymère non ionique, un polymère amphotère dans des conditions cationiques ou leurs combinaisons. On peut également traiter la pâte à papier avec au moins un coagulant, au moins un floculant, au moins un amidon cationique, au moins un enzyme cellulitique et/ou d'autres additifs classiques de pâte à papier. On aplatit la pâte obtenue et on la draine, de façon à obtenir du papier ou du carton. L'invention concerne également d'autres procédés de fabrication de papier, ainsi qu'un dispositif servant à mettre en application ces procédés. Elle concerne encore du papier et du carton contenant la pâte à papier séchée ayant été traitée avec des microparticules fibreuses d'alumine colloïdale cationique et un polymère.

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