D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
D21H 17/70 (2006.01) C01F 11/18 (2006.01) C08K 3/26 (2006.01) C09C 1/02 (2006.01) D21C 9/00 (2006.01) D21H 23/00 (2006.01) D21H 17/67 (2006.01)
Patent
CA 2445658
The invention relates to a method for charging fibres contained in a fibrous suspension with calcium carbonate, by means of a chemical precipitation reaction, whereby calcium oxide and/or calcium hydroxide is added to the fibrous suspension and at least partly liquid carbon dioxide is injected into the reactor to initiate the precipitation reaction, thus providing for a reaction of the starting materials calcium oxide or calcium hydroxide to give the reaction products calcium carbonate and water. The carbon dioxide can subsequently be added in liquid form or partly in liquid form and partly in gaseous form. A corresponding device for the charging of fibres is also described.
L'invention concerne un procédé pour charger des fibres contenues dans une suspension fibreuse par précipitation avec du carbonate de calcium. Selon ce procédé, de l'oxyde de calcium et/ou de l'hydroxyde de calcium est ajouté à la suspension fibreuse et, pour provoquer la précipitation, du dioxyde de carbone au moins partiellement liquide est injecté dans le réacteur, les matières de départ que sont l'oxyde de calcium et/ou de l'hydroxyde se transformant ainsi en produits de réaction, à savoir en carbonate de calcium et en eau. Selon l'invention, le dioxyde de carbone ajouté est soit entièrement liquide, soit en partie liquide et en partie gazeux. La présente invention porte également sur un dispositif servant à la charge des fibres.
Doelle Klaus
Heise Oliver
Sim & Mcburney
Voith Paper Patent Gmbh
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