Selective retention of filling components and improved...

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 17/69 (2006.01) D21H 17/48 (2006.01) D21H 17/67 (2006.01) D21H 17/68 (2006.01) D21H 21/10 (2006.01) D21H 23/76 (2006.01)

Patent

CA 2315676

A method for increasing retention and drainage of filling components in a paper making furnish in a paper making process comprising the steps of: making a slurry of filling components, treating the slurry with from about 0.003% to about 2.0% by weight based on total solids of a phenolic enhancer to form a pretreated filling components slurry, adding to the furnish the pretreated slurry and adding to the furnish from about 0.003 to about 0.5% by weight based on total solids in the slurry of a polymeric flocculant, whereby retention and drainage of filling components in the paper making furnish is increased. A preferred enhancer is a condensate of phenol and formaldehyde and preferred flocculants contain acrylamide, methacrylamide, and/or N--vinylformamide. The methods provide important benefits in many papermaking applications, in which desirable filling components are retained in the final sheet, while undesirable filling components, such as ink and dye particles present in a recycled papermaking furnish, are not retained.

L'invention concerne un procédé d'augmentation de la rétention et de la séquestration de composants de charge dans une composition de papeterie, dans un procédé de fabrication de papier, qui consiste à : produire une suspension de composants de charge, traiter la suspension à l'aide d'environ 0,003 à environ 2,0 % en poids par rapport aux matières solides totales, d'un activateur phénolique, de sorte qu'une suspension de composants de charge pré-traitée soit formée, ajouter à la composition environ 0,003 à environ 0,5 % en poids par rapport aux matières solides totales dans la suspension un floculant polymère, la rétention et la séquestration des composants de charge dans la composition de papeterie étant ainsi augmentées. L'activateur préféré est un condensat de phénol et de formaldéhyde et les floculants préférés contiennent de l'acrylamide, du méthacrylamide et/ou du N-vinylformamide. Les procédés de l'invention présentent de nombreux avantages dans de nombreuses applications de fabrication du papier dans lesquelles les composants de charge voulus sont retenus dans la feuille finale alors que les composants de charges indésirables, tels que les particules d'encre et de colorant présentes dans une composition de fabrication de papier recyclée, ne sont pas retenues.

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