An unexpected reason for color unevenness! The hidden traps of metallic paint.
Even though the same paint is used, the color changes between batches. This is a common cause of color variation in metallic coatings for automotive parts.
[Cause of Occurrence] In automotive interior and exterior parts, color unevenness (color variation) such as "the color appears different depending on the lighting" and "there are variations in shade between lots," despite being painted in the specified color, is a major factor that prevents meeting strict appearance standards. [Truth] Particularly with metallic and pearl-type paints, the arrangement of "aluminum pigments contained in the paint" determines the color tone. If the air pressure of the spray gun is unstable or the exhaust airflow in the painting booth is too strong, the pigments do not align uniformly, leading to color unevenness and worsening surface roughness. [Improvement Measures] To maintain a stable color tone, it is essential to stabilize the compressor pressure and optimize the airflow in the booth (approximately 0.3 to 0.5 m/s). A checklist for equipment inspection to prevent color variation and a guide for optimizing spraying conditions can be downloaded below. [Summary] Color unevenness is not due to defects in the paint itself, but occurs when disturbances in the airflow and air pressure of the painting environment disrupt the arrangement of pigments. Eiwa Kogei Co., Ltd. promises high-quality finishes by preventing color variation between lots through the maintenance and management of a stable painting environment.
- Company：永和工芸
- Price：Other
