Powder coating process

C - Chemistry – Metallurgy – 23 – C

Patent

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Details

C23C 24/00 (2006.01) B05C 19/02 (2006.01) B05D 1/24 (2006.01) C09D 5/46 (2006.01)

Patent

CA 2314075

A process for forming a coating on a conductive substrate, which comprises establishing a fluidised bed of a powder coating composition, immersing the substrate wholly or partly within the said fluidised bed, applying a voltage to the substrate for at least part of the period of immersion, whereby particles of the powder coating composition adhere to the substrate, withdrawing the substrate from the fluidised bed and forming the adherent particles into a continuous coating over at least part of the substrate. The process enables the coating of substrate areas which, because of the Faraday cage effect, are inaccessible in conventional electrostatic coating processes, and also enables the formation of thinner coatings than are obtainable by conventional fluidised-bed processes.

Cette invention concerne un procédé d'application de revêtement sur un substrat conducteur. Ce procédé consiste à: former un lit fluidisé à partir d'un composition de revêtement en poudre; immerger le substrat en partie ou en totalité dans ledit lit fluidisé, appliquer une tension au substrat pendant une partie au moins de la durée d'immersion, ce qui fait adhérer sur le substrat les particules de la composition en poudre, retirer ce substrat du lit fluidisé et coucher les particules adhérentes sans solution de continuité sur au moins une partie du substrat. Grâce à ce procédé, il est possible de déposer un revêtement sur des surfaces de substrat qui ne se prêtent pas à des procédés électrostatiques classiques d'application de revêtement à cause de l'effet de cage de Faraday, et également d'obtenir des couches plus minces qu'avec des procédés classiques par lit fluidisé.

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