Theoretically, there should be no color difference in RAL color powder coatings after curing, as the color consistency is strictly controlled in the production process of powder coatings. However, in practical applications, color differences may occur due to various factors, such as uneven spray thickness, non-uniform oven temperature, mismatch between hoist speed and conveyor chain speed, etc. . To ensure the color consistency of powder coatings after curing, it is necessary to precisely control the spraying and curing processes and use professional color difference instruments for detection to meet the strict color requirements of customers . In most cases, the dry film thickness measurements before and after curing match closely, with differences of only a few micrometers . If a color difference problem occurs, the relevant parameters in the production process should be checked and adjusted.
HLM（Holyme）Powder Coating CO., LTD Strictly refer to RAL color card production standards
References:
- The dry film thickness measurement values before and after curing are highly consistent, with differences of only a few micrometers.
- Professional color difference instruments can be used to ensure the consistency of powder coating color after curing, meeting strict color requirements.
- Factors such as uneven spray thickness, non-uniform oven temperature, and mismatch between hoist speed and conveyor chain speed can lead to color differences in powder coatings after curing.