Method of and apparatus for powder coating wood substrates

Details Method of and apparatus for powder coating wood substrates Method of and apparatus for powder coating wood substrates

B - Operations, Transporting

05

D

B05D 3/06 (2006.01) B05D 1/12 (2006.01) B05D 7/06 (2006.01)

Patent

CA 2663876

In the powder coating of wood substrates, there is the problem that on the one hand they must not become too hot and on the other hand the coating requires a certain temperature for crosslinking. With the known methods and devices, adequate crosslinking is not ensured. The object is to overcome this disadvantage. For this purpose, the freshly sprayed wood substrates (2) are pretreated by means of brief infrared radiation in such a way that the lacquer powder adheres to the wood substrates (2) and that the surfaces of the powder layer are pre-crosslinked. Then, the surfaces of the wood substrates (2) pretreated in this way are subjected to intensive hot air treatment, wherein the average temperature of the wood substrates (2) remains below 100°C.

Le problème avec le revêtement en poudre de substrats en bois est d'une part que ces derniers le doivent pas être trop chauds, et d'autre part que le revêtement nécessite une certaine température pour la réticulation. Les procédés et dispositifs connus ne garantissent pas une réticulation suffisante. L'objet de l'invention est de pallier cet inconvénient. Pour cela, les substrats en bois (2) fraîchement débités sont d'abord prétraités au moyen d'un rayonnement infrarouge de courte durée de telle sorte que la poudre de vernis colle uniformément aux substrats de bois (2) et que les surfaces de la couche de poudre soient pré-réticulées. Les surfaces des substrats de bois (2) ainsi prétraités sont alors exposées à un traitement intensif à l'air chaud, tandis que la température moyenne des substrats de bois (2) reste inférieure à 100°C.

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