Process and coating color for coating of paper and board

Details Process and coating color for coating of paper and board Process and coating color for coating of paper and board

1998-01-13

2000-09-12

Cameron, Erma

Coating processes

With post-treatment of coating or coating material

Solid treating member or material contacts coating

427361, 427364, 427365, 427366, 427382, 427391, 427392, 427395, 427396, 162134, 162136, B05D 302

Patent

active

061174912

ABSTRACT:
The present invention concerns a process and a coating color for coating a cellulosic web. According to the process an aqueous coating color is applied on the surface of the web. The invention comprises using a coating color which contains an aqueous polymer whose viscosity in an aqueous solution increases when the temperature rises. Preferably, methylcellulose or a corresponding polymer having a gelling temperature of about 5 to 10 .degree. C. more than the application tempature of the coating color is used. The temperature of the coating is increased after the application of the coating color in order to achieve gelling of the polymer. As a result, the coating color rapidly solidifies which decreases the amount of mixture being recycled and it reduces mist-formation in the film press method and improves coverage of coating applied by conventional blade coating.

REFERENCES:
patent: 4865914 (1989-09-01), Malhotra
patent: 5118533 (1992-06-01), Saji et al.
patent: 5158806 (1992-10-01), Unger
Patent for Inventions, Abridgments of Specifications, Herland Printing Works, York, 1954, Abstract for U.K. Patent No. 623,357, p. 39.
Patent for Inventions, Abridgments of specifications, Herlad Printing Works, York, 1954, Abstract for U.K. Patent No. 609,927, pp. 141-142.
Dialog File 351 (World Patents Index) English language abstract of FI 884196, WPI Accession No. 89-087231/12. 1989.
Dahlvik, P., et al., "Interactions in Coating Colors Induced by Temperature-Sensitive Cellulosic Polymer," Intl. Paper and Coating Chem. Symp., Ottawa, Canada, pp. 155-162 (Jun. 1996).
European Search Report for European Application No. EP 98 66 0001 Mar. 1998 .

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