Method and apparatus for coating a web with a preferably dry...

Details Method and apparatus for coating a web with a preferably dry... Method and apparatus for coating a web with a preferably dry...

D - Textiles, Paper

21

H

D21H 23/46 (2006.01) D21H 23/30 (2006.01) D21H 23/56 (2006.01) B05C 9/14 (2006.01) D21H 23/60 (2006.01) D21H 23/64 (2006.01) D21H 25/06 (2006.01)

Patent

CA 2412552

A method and an assembly is disclosed for coating a web (1) of paper or board by a dry treatment agent, the method comprising the step of applying the treatment agent to at least one side of the moving web (1). In the method is used a treatment agent contains a binder capable of undergoing a change of state at least under the effect of elevated temperature. The web (1) after being treated with the treatment agent is subjected to at least an elevated temperature at which the binder becomes deformable, and the web is subjected to a lower temperature serving to set the binder so that the same bonds the treatment agent to the web surface. The solids content of the treatment agent is not less than 75 %, preferably not less than 90 %, whereby a drying step after the treatment is not required.

L'invention concerne un procédé et un ensemble permettant d'enduire une bande (1) de papier ou de carton avec un agent de traitement par voie sèche. On applique l'agent au moins sur un côté de la bande en mouvement (1). L'agent renferme un liant susceptible de changer d'état au moins sous l'effet d'une température élevée. Une fois traitée, la bande (1) est soumise au moins à une température élevée rendant le liant déformable, puis la bande est soumise à une température moins élevée permettant la prise du liant, ce qui assure la liaison de cet agent sur la surface de la bande. La teneur de l'agent en matières solides n'est pas inférieure à 75 %, et de préférence pas à 90 %, moyennant quoi le séchage après traitement n'est pas indispensable.

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