D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
D21H 17/70 (2006.01) D21C 9/00 (2006.01)
Patent
CA 2614813
Disclosed is a method for loading a pulp suspension (S) with calcium carbonate. According to said method, liquid calcium hydroxide is added as lime milk (7) during or before the dissolving process (1) carried out to form the pulp, for example. A chemical reaction in which finely distributed calcium carbonate is precipitated is triggered by introducing gaseous carbon dioxide (8) into the pulp suspension processed in said manner. The inventive method is particularly economical and effective by adding calcium oxide or calcium hydroxide early on.
L'invention concerne un procédé servant à charger une suspension de matières fibreuses (S) en carbonate de calcium. Ce procédé consiste à ajouter p. ex. de l'hydroxyde de calcium liquide, tel que du lait de chaux (7), pendant ou avant la dissolution (1) mise en oeuvre pour former la matière fibreuse. L'introduction de dioxyde de carbone gazeux (8) dans la suspension de matières fibreuses ainsi traitée déclenche, dans cette dernière, une réaction chimique pendant laquelle du carbonate de calcium finement divisé est précipité. Grâce à l'ajout précoce d'oxyde de calcium ou d'hydroxyde de calcium, ledit procédé est particulièrement économique et efficace.
Doelle Klaus
Pfalzer Lothar
Sim & Mcburney
Voith Patent Gmbh
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