| 摘要 |
Disclosed is that one coating system of aqueous intermediate-coating paint can employ a plurality of colors of aqueous intermediate-coating paints and easily recycle them without color mixing problems. The method comprises spray-coating an article with aqueous paint in a coating booth, recovering over-spray paint that has not applied on the article in a booth circulating water bath, carrying out spray-coating for a certain period of time followed by sending the content of the booth circulating water bath to a concentration tank after finishing a certain term for coating, separating the content with a ultrafiltration device into a concentrated paint having a desired concentration and a filtrate, storing the concentrated paint in a recovering tank for re-using on desire, the spray-coating being conducted using at least two different achromatic color intermediate-coating paints having different lightness, the over-spray paint being recovered mixing together the different achromatic color intermediate-coating paints and subjected to concentration to form a concentrated paint, and the concentrated paint being either re-used as one of achromatic color intermediate-coating paints as it is, or being subjected to lightness adjustment to lower lightness and re-used as one of achromatic color intermediate-coating paints having lower lightness.
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