What are the causes of color mismatch? Three basics of color difference management in painting.
The color does not match the previous lot and adjacent parts. The cause is the film thickness and baking temperature. I will explain a method to manage this with numerical values instead of visual inspection.
Even though they have the same color number, they look different when placed next to the previous lot. It is not the paint, but the film thickness and curing conditions that affect the color. If the film thickness changes by 10 microns, the color difference becomes noticeable to the naked eye. ────────────── ■Cause of Occurrence Colors with low hiding power will show a change in brightness when the film thickness is thin, as the substrate becomes visible. The higher the curing temperature, the more the resin yellowes, and the difference is more pronounced in white shades. ■Truth Color matching done only by visual inspection creates variability among evaluators. When the type of lighting changes, the same painted panel can appear to have a different color. ■Improvement Measures Measure with a color difference meter and set the acceptance criteria numerically. Keep the film thickness within specified ranges and fix the curing temperature and time for each color. Please utilize the materials that summarize color management and film thickness standards.
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