MULTI-STAGE PROCESSES FOR COATING SUBSTRATES WITH LIQUID BASECOAT AND POWDER TOPCOAT

Processes for coating metal or polymeric substrates are provided which inclu de the steps of: (a) applying a liquid basecoating composition to a surface of the substrate; (b) exposing the basecoating composition to air having a temperature ranging from about 10~C to about 50 ~C for a period of at le...

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Bibliographische Detailangaben
1. Verfasser:	EMCH, DONALDSON J
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL BLASTING DRYING DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM HEATING LIGHTING MECHANICAL ENGINEERING PERFORMING OPERATIONS PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL SPRAYING OR ATOMISING IN GENERAL TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	Processes for coating metal or polymeric substrates are provided which inclu de the steps of: (a) applying a liquid basecoating composition to a surface of the substrate; (b) exposing the basecoating composition to air having a temperature ranging from about 10~C to about 50 ~C for a period of at least about 5 minutes to volatilize at least a portion of volatile material from t he liquid basecoating composition, the velocity of the air at a surface of the basecoating composition being less than about 0.5 meters per second; (c) applying infrared radiation and hot air simultaneously to the basecoating composition for a period of at least about 2 minutes, the velocity of the ai r at the surface of the basecoating composition being less than about 4 meters per second, the temperature of the metal substrate being increased at a rate ranging from about 0.4 ~C per second to about 1.2 ~C per second to achieve a peak substrate temperature ranging from about 120 ~C to about 165 ~C, such that a dried basecoat is formed upon the surface of the substrate; and (d) applying a powder topcoating composition over the dried basecoat.