Avoiding Powder Residue on the Object: Causes & GEMA Solutions

Powder residue on the coated object affects appearance, adhesion, and quality. GEMA outlines common causes and provides practical solutions.

🔍 Typical Causes According to GEMA

• Too much powder per gun: Excess powder accumulates – reduce amount or adjust feed speed.
• Too much air volume: Check total air flow – GEMA recommends 4–5 Nm³/h for manual coating.
• Too long powder hoses: Longer hoses cause pulsation and loss – GEMA advises shorter routing.
• Incorrect nozzle selection: Choose based on workpiece and surface profile.
• High humidity: Over 80% relative humidity causes powder clumping – use climate control or isolated work zones.
• High share of coarse particles: Analyze powder; request finer fraction from supplier if needed.

🛠️ GEMA Tips for Clean Results

• Reduce powder quantity per gun and adjust feed settings.
• Set total air flow to 4–5 Nm³/h.
• Use short powder hoses with wide bending radii.
• Select optimal nozzle according to part geometry.
• Dehumidify or climate-control the work area.
• Check powder specs – use finer powder if necessary.

✅ Benefits of Clean Powder Coating

• Flawless finish without powder residue
• Improved adhesion & surface quality
• Less rework & material waste
• Cost savings on powder & time

📌 Conclusion

Prevent powder buildup right from the start: reduce powder output, optimize hose layout, match the nozzle, and regulate humidity and air volume – according to GEMA, these are the keys to clean and high-quality powder coating.