Improved papermaking processes

Details Improved papermaking processes Improved papermaking processes

D - Textiles, Paper

21

H

D21H 17/63 (2006.01) D21C 9/00 (2006.01)

Patent

CA 2319180

The invention relates to papermaking processes wherein calcium carbonate is included in a pulp suspension. The dissolution of the calcium carbonate in the papermaking system is prevented or substantially retarded by the introduction of carbon dioxide to said pulp suspension in connection with subjecting said calcium carbonate in said papermaking system to pH conditions of about 8 or lower. The invention also provides processes for the production of paper or board in papermaking systems wherein solid calcium carbonate is present as a filler and/or pigment.

L'invention concerne des procédés qui permettent de fabriquer du papier, selon lesquels on incorpore du carbonate de calcium à une suspension de pâte à papier. On empêche ou on retarde sensiblement la dissolution du carbonate de calcium en introduisant du dioxyde de carbone dans ladite suspension, puis en mettant le carbonate de calcium contenu dans le système de fabrication de papier dans des conditions de pH d'environ 8 ou moins. L'invention concerne également des procédés qui permettent de produire du papier ou du carton dans des systèmes de fabrication du papier, selon lesquels du carbonate de calcium solide est présent en tant que charge et/ou pigment.

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