Paper and materials and processes for its production

Details Paper and materials and processes for its production Paper and materials and processes for its production

D - Textiles, Paper

21

H

D21H 23/04 (2006.01) D21H 17/16 (2006.01) D21H 17/17 (2006.01) D21H 21/16 (2006.01)

Patent

CA 2477875

Paper is made by providing an anionic aqueous emulsion of a size, usually a reactive anhydride size, and mixing it into a cellulosic suspension prior to drainage of the suspension to form a sheet which is then dried to provide paper (including paper board). The emulsion is preferably stabilised wholly or mainly by 0.5 to 30 parts by weight (per part by weight size) of water soluble, anionic, polymeric stabiliser, which is preferably anionic starch. Alternatively, the emulsion may be added to the cellulosic suspension while it is anionic, before mixing retention into it. The emulsion may be added to the cellulosic suspension after cationic retention aid has been added to it, the emulsion being added with, before or after mixing anionic microparticulate material or other anionic bridging aid, prior to drainage of the suspension.

L'invention concerne un procédé de fabrication de papier, consistant à utiliser une émulsion aqueuse anionique de colle, généralement une colle d'anhydride réactif, et à la mélanger dans une suspension cellulosique avant de drainer la suspension pour former une feuille qui est alors séchée afin d'obtenir du papier (y compris du carton). L'émulsion est, de préférence, entièrement stabilisée, ou essentiellement par 0,5 à 30 % en poids (par partie par calibre de pondération) d'un stabilisateur polymérique soluble dans l'eau, de préférence de l'amidon anionique. En variante, l'émulsion peut être ajoutée à la suspension cellulosique lorsqu'elle est anionique, avant de mélanger une rétention dans celle-ci. L'émulsion peut être ajoutée à la suspension cellulosique suite à l'ajout d'une aide de rétention cationique, l'émulsion étant ajoutée avant ou après le mélange d'un matériau microparticulaire anionique ou d'une autre aide de formation de pont anionique, avant le drainage de la suspension.

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