Method for covering an object with a film and equipment...

B - Operations – Transporting – 05 – D

Patent

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Details

B05D 1/24 (2006.01) B05C 19/02 (2006.01)

Patent

CA 2340033

The invention concerns a method for covering an object with a film obtained by melting a thin layer of powder, which consists in: (a) providing an electrostatic fluidised bed of powder in a vat, said powder being essentially charged with a triboelectric charging device, other than the vat walls, located in the vat and/or outside the vat; (b) soaking in the vat the object connected to a zero potential or sufficient for covering it with powder; (c) then placing the powder coated object in an oven at a sufficient temperature until the coating film is obtained by the melting of the powder. The triboelectric charging device is for example a honey comb weave vertically arranged at the bottom of the vat.

L'invention concerne un procédé de recouvrement d'un objet par un film. Le procédé selon l'invention est caractérisé en ce que: (a) on dispose d'un lit de poudre fluidisée électrostatique dans une cuve, la poudre étant chargée essentiellement par un dispositif tribochargeur, autre que les parois de la cuve, situé dans la cuve et / ou à l'extérieur de la cuve; (b) on trempe dans la cuve l'objet relié à un potentiel zéro ou suffisant pour le recouvrir de poudre; et (c) on place ensuite l'objet recouvert de la poudre dans un four à une température suffisante pour obtenir un film de revêtement par fusion de la poudre. L'invention est particulièrement utile pour les paniers métalliques de lave- vaisselle.

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