D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
D21H 17/29 (2006.01) D21H 17/66 (2006.01) D21H 23/14 (2006.01) D21H 23/18 (2006.01)
Patent
CA 2190499
The invention relates to a new process for the manufacture of paper which employs, in the fibrous composition, a cationic starch exhibiting a high level of fixed nitrogen, namely greater than 0.95 %, and a polyaluminium compound, such as a (basic) aluminum polychloride or an aluminium polychlorosulphate. This process makes it possible, including under difficult conditions (fibrous composition based on old papers, significant closure of the circuits), to improve the level of retention of starch and the physical charac- teristics of the paper, indeed to increase the machine speed by dispensing with the surface treatment optionally applied to the paper. The process according to the invention is particularly suitable for the manufacture of paper for graphical use or of paper for wrapping or packaging and very particularly of fluting paper or of liner paper for corrugated fibreboard.
L'invention concerne un nouveau procédé de fabrication de papier mettant en oeuvre, au sein de la composition fibreuse, un amidon cationique présentant un taux d'azote fixé élevé, à savoir supérieur à 0,95 % et un composé polyaluminium tel qu'un polychlorure (basique) d'aluminium ou un polychlorosulfate d'aluminium. Ce procédé permet, y compris dans des conditions difficiles (composition fibreuse à base de vieux papiers, fermeture importante des circuits), d'améliorer le taux de rétention en amidon et les caractéristiques physiques du papier, voire d'augmenter la vitesse de la machine par suppression d'un traitement de surface éventuellement appliqué au papier. Le procédé selon l'invention est particulièrement adapté à la fabrication de papier à usage graphique ou de papier pour l'emballage ou le conditionnement et tout particulièrement de papier de cannelure ou de couverture pour carton ondulé.
Dondeyne Marcel
Petit Jean-Yves
Fetherstonhaugh & Co.
Roquette Freres
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