Process and coating composition for coating a paper web

Details Process and coating composition for coating a paper web Process and coating composition for coating a paper web

D - Textiles, Paper

21

H

D21H 19/38 (2006.01)

Patent

CA 2397097

The invention relates to a process for producing a coated paper web. According to the process, a paper web is formed from a fibrous raw material in a paper machine, the paper web is coated with a pigment-containing coating mix, and the coated paper web is calendered. According to the invention, the paper web is coated with a coating composition that contains as the mineral pigment mainly a mixture of gypsum and calcium carbonate, the amount of gypsum being at minimum 10 % by weight of the total amount of gypsum and calcium carbonate. With mixtures of calcium carbonate and gypsum, such as mixtures of PCC and gypsum and mixtures of PCC, ground carbonate and gypsum, there are obtained simultaneously a sufficient gloss and smoothness as well as brightness and opacity better than with PCC-kaolin pastes.

L'invention concerne un procédé de fabrication d'une bande de papier revêtue. Selon ledit procédé, une bande de papier est formée à partir d'un matériau brut fibreux dans une machine à papier, la bande de papier est revêtue d'un mélange de revêtement contenant des pigments, et la bande de papier revêtue est calandrée. Selon l'invention, la bande de papier est revêtue d'une composition de revêtement contenant essentiellement un mélange de gypse et de carbonate de calcium en tant que pigment minéral, la quantité de gypse étant au moins de 10 % en poids de la quantité totale de gypse et de carbonate de calcium. Des mélanges de carbonate de calcium et de gypse, tels que des mélanges de PCC et de gypse, et des mélanges de PCC, de carbonate broyé et de gypse, permettent d'obtenir simultanément un brillant et un lissé suffisants, ainsi qu'un éclat et une opacité supérieures à celles obtenues avec des pâtes de PCC-kaolin.

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