D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
D21H 25/00 (2006.01) D21G 1/00 (2006.01)
Patent
CA 2318244
The present invention concerns a method for treating the surface of a fibrous web by mechanical grinding. According to the invention, the grinding is performed at substantially dry state by removing only the higher parts of the paper surface without substantially increasing the density of the web. By reducing the roughness of the surface by a maximum of 90 %, the strength properties of the web remain essentially unchanged or they are even improved. Thus, when the roughness of the surface is reduced by about 40 to 60 %, the tear strength increases with more than 5 % in comparison to an untreated web. Papers and boards treated by the present method can be used for printing, packaging and wrapping.
L'invention porte sur un procédé de traitement de la surface de bandes fibreuses par un meulage à l'état sensiblement sec n'éliminant que les parties les plus saillantes de la surface du papier sans pratiquement augmenter la densité de la bande. Cette réduction de la rugosité, pouvant aller jusqu'à un maximum de 90 %, laisse intacte, et même améliore, la résistance de la bande. Lorsque la rugosité superficielle est réduite d'environ 40 à 60 %, la résistance à la déchirure de la bande croît de plus de 5 % par rapport à celle d'une bande non traitée. Les papiers et cartons traités par ce procédé peuvent servir pour l'imprimerie, l'empaquetage ou l'emballage.
Ahonen Heikki
Dettling Bernhard
Idi-Head Oy
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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