Edge Build‑Up: Preventing Coating Excess on Edges in Powder Coating
A common quality issue in powder coating is color accumulation on edges or corners. This “Edge Build‑Up” occurs when the powder spray is not properly directed or the nozzle is too far from the object.
🚩 Cause Analysis
- Spray too wide: The powder spray is too diffused – powder tends to deposit more on edges.
- Incorrect nozzle type: Standard nozzles often produce uncontrolled distribution – precision requires special nozzles.
- Large spacing between workpieces: If spacing is too wide, powder settles at outer edges.
🛠️ Practical Solutions
- Targeted spray control: Use a narrow, focused spray aimed directly at the edge.
- Select suitable nozzles: Flat-jet nozzles allow better direction; deflector nozzles only for flat surfaces or interiors.
- Gap control: Adjust workpiece spacing – controlled distance helps avoid edge accumulation.
- Use PCC/SuperCorona® settings: Precision Charge Control or SuperCorona® mode reduces edge build-up effects.
✅ Your Benefits at a Glance
- Even coating without edge accumulation
- Lower material use through precise spraying
- Higher reproducibility and process quality
🔗 Further Guidance
For more insights on edge build-up and nozzle selection, see the GEMA Tips & Tricks section on “Edge build‑up”.
