Method for coating webs

Details Method for coating webs Method for coating webs

D - Textiles, Paper

21

H

D21H 19/38 (2006.01) D21H 21/52 (2006.01) D21H 23/34 (2006.01) D21H 11/10 (2006.01) D21H 19/40 (2006.01) D21H 19/82 (2006.01) D21H 23/72 (2006.01)

Patent

CA 2247309

16 The present invention relates to a method for coating of a fibrous web. According to the method a coating colour with pigments is applied to the surface of the web and dried in order to form a coated web. The invention comprises using a coating colour which contains pigments having a steep particle size distribution, a maximum of 35 % of the pigment particles being smaller than 0.5 ~m. The coating colour is spread on the surface of the web with a coating speed of at least 1450 m/mir, preferably over 1600 m/min The coating pigment having a steep particle size distribution gives rise to a coating colour which solidifies at much lower dry substance than conventional coating colour. In this way coating can be controlled at high speed without renewability and quality problems.

La présente invention fait état d'une méthode de couchage d'une nappe fibreuse. Il s'agit d'appliquer une sauce de couchage contenant des pigments sur la surface de la nappe et de la faire sécher pour obtenir une nappe enduite. La présente invention utilise une sauce de couchage contenant des pigments ayant une distribution granulométrique abrupte, présentant, au plus, 35 % de particules de pigments de moins de 0.5 m. La sauce de couchage est répandue sur la surface de la nappe à une vitesse d'au moins 1450 m/min et, de préférence, au-delà de 1600 m/min. La distribution granulométrique abrupte du pigment de couche se traduit par une sauce de couchage qui se solidifie à des niveaux de substance sèche beaucoup moins importants que les sauces de couchage conventionnelles. Ainsi, le couchage peut être contrôlé à des vitesses supérieures sans problèmes de renouvabilité et de qualité.

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