Different layer thicknesses in powder coating: causes and solutions
A uniform layer thickness is essential for the quality, appearance and protection of a powder coating. Deviations lead to visual defects, reduced corrosion protection or problems with dimensional accuracy. In this article, we show typical causes and solutions for uneven layer thicknesses.
Typical causes of uneven layer thickness
- Irregular powder output: Fluctuations in the powder flow due to dirty or worn gun/conveyor technology impair layer formation.
- Incorrect gun distance: Too little or too much distance between the gun and the workpiece leads to overcoating or undercoating.
- Fluctuating system settings: Changes in high voltage, powder quantity or conveying air without adjustment to the geometry and powder type cause inhomogeneity.
- Uneven speed: Variations in application speed lead to fluctuations in layer thickness, especially with manual systems.
Recommended solutions
- Constant system parameters: Powder output, high voltage and conveying air should be adjusted to the powder and the component and kept constant.
- Optimised gun guidance: Ensure an even distance (approx. 20–25 cm) between the gun and the workpiece, and move the gun smoothly and continuously.
- Regular maintenance: Clean the powder delivery system and application equipment regularly and check for wear.
- Continuous quality assurance: Check the layer thickness with measuring devices and correct it early if necessary.
Conclusion
Variations in layer thickness are not a coincidence, but can be avoided. With optimal settings, clean conveyor technology and trained users, you can ensure a uniform, high-quality powder coating and long-term customer satisfaction.
