Method and apparatus for coating with liquid or...

B - Operations – Transporting – 05 – D

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Details

B05D 1/18 (2006.01) D06B 1/08 (2006.01) D06B 3/10 (2006.01) D06M 23/00 (2006.01) D06M 23/10 (2006.01)

Patent

CA 2348463

A method of coating a substrate comprises immersing a surface portion of a substrate in a liquid or supercritical first phase. The first phase comprises carbon dioxide and a coating component such as a polymer. The substrate is then withdrawn from the first phase into a distinct second phase such as a gas atmosphere so that the coating component is deposited on said surface portion. The withdrawal step is followed by separating the carbon dioxide from the coating component (e.g., by evaporation, venting, heating, etc.) so that the coating component is retained as a coating layer formed on the surface portion. Apparatus for carrying out the method by free meniscus coating, or employing a metering element such as a knife, blade, or roll, are also disclosed.

L'invention concerne un procédé de revêtement d'un substrat, qui consiste à immerger une partie superficielle d'un substrat dans une première phase liquide ou supercritique. Cette première phase comprend un anhydride carbonique, et une matière de revêtement telle qu'un polymère. Le substrat est ensuite retiré de la première phase et placé dans une deuxième phase distincte, telle qu'un atmosphère gazeux, afin de réaliser un dépôt de la matière de revêtement sur ladite partie superficielle. L'étape de retrait est suivie de la séparation de l'anhydride carbonique de la matière de revêtement (par exemple, par évaporation, aération, chauffage, etc.), de sorte que la matière de revêtement soit retenue en tant que couche de revêtement formée sur la partie superficielle. L'invention concerne également un appareil pour réaliser le procédé par revêtement par ménisque libre, ou par l'emploi d'un élément de dosage tel qu'un couteau, une lame ou un rouleau.

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