Method and apparatus for applying a polychromatic coating...

B - Operations – Transporting – 05 – D

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B05D 7/14 (2006.01) B05B 12/14 (2006.01) B05D 5/06 (2006.01) B05D 7/00 (2006.01)

Patent

CA 2391388

A method is provided for coating a substrate. A first waterborne coating material which is substantially free of effect pigment is applied over the substrate by one or more bell applicators. A second waterborne coating material comprising effect pigment is applied over the first coating material by one or more bell applicators. Between application of the first and second basecoat materials, the first basecoat material can be stabilized by exposing the first basecoat material to air having a temperature ranging from about 50 ~F (10.0 ~C) to about 90 ~F (32.5 ~C), a relative humidity of about 40 % to about 80 % and an air velocity at the surface of the coating material of about 20 FPM (0.10 m/s) to about 150 FPM (0.76 m/s) for a period of about 10 to about 180 seconds. A coating application system is also provided. The system includes a first supply of at least one first coating component which is substantially free of effect pigment and a second supply of at lest one effect- pigmented coating component. At least one mixer is provided for dynamically mixing the effect pigment-free coating component and/or the effect pigmented coating component to form a mixed coating material. The mixed coating material is received from the mixer and applied over the substrate by a bell applicator.

L'invention concerne un procédé de revêtement d'un substrat. Un premier matériau de revêtement aqueux sensiblement exempt de pigment à effet est appliqué sur le substrat au moyen d'un ou de plusieurs applicateurs à cloche. Un second matériau de revêtement aqueux comprenant un pigment à effet est appliqué sur le premier au moyen d'un ou de plusieurs applicateurs à cloche. Entre l'application du premier et du deuxième revêtement de base, le premier peut être stabilisé par une exposition à l'air à une température comprise entre 50 ·F (10·C) et 90 ·F (32, 5·C) environ, une humidité relative d'environ 40 % à environ 80 % et une vitesse d'air à la surface du matériau de revêtement d'environ 20 pieds/minute (0,10 m/s) à environ 150 pieds/minute (0,76 m/s) au cours d'une période comprise entre 10 et 180 secondes. L'invention concerne également un système d'application du revêtement. Le système comporte un premier apport d'au moins un premier composant de revêtement sensiblement exempt de pigment à effet et un second apport d'au moins un composant à pigment à effet. Au moins un mélangeur est conçu pour mélanger de manière dynamique le composant de revêtement exempt de pigment à effet et/ou le composant de revêtement à pigment à effet, de façon à former un matériau de revêtement mélangé. Ce dernier est reçu du mélangeur et appliqué sur le substrat au moyen de l'applicateur à cloche.

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