Method of increasing filler content in papermaking

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 17/29 (2006.01) D21H 17/67 (2006.01) D21H 21/18 (2006.01)

Patent

CA 2741856

The invention provides a method of producing paper with a higher proportion of mineral filler particles than is otherwise be possible without the expected loss in paper strength. The method allows for the use of the greater amount of filler particles by coating at least some of the filler particles with a material that prevents the filler materials form adhering to a strength additive. The strength additive holds the cellulose fibers together tightly and is not wasted on the filler particles. The method is particularly effective when the filler particles are a PCC-GCC blend and when the GCC particles are coated with the adherence preventing coating.

L'invention porte sur un procédé de production de papier avec une plus forte proportion de particules de charge minérale que ce qui est, par ailleurs, possible sans la perte prévue de résistance du papier. Le procédé permet l'utilisation de la plus grande quantité de particules de charge par enrobage d'au moins certaines des particules de charge avec un matériau qui empêche les matériaux de charge d'adhérer à un additif de résistance. L'additif de résistance maintient étroitement les fibres de cellulose les unes avec les autres et n'est pas gaspillé sur les particules de charge. Le procédé est particulièrement efficace lorsque les particules de charge sont un mélange de carbonate de calcium précipité-carbonate de calcium broyé et lorsque les particules de carbonate de calcium broyé sont enrobées avec le revêtement de prévention d'adhérence.

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