Powder deposits on objects in powder coating: identifying causes and effective remedies
Powder deposits on the object can lead to undesirable surface effects and quality defects. It is therefore crucial to identify the causes of these deposits and take appropriate countermeasures. Based on the recommendations of GEMA, we present common causes and optimisation options below.
1. Inadequate grounding of the workpiece
Poor grounding can prevent excess powder from being effectively repelled, causing it to accumulate as deposits. Recommendation: Ensure that the workpiece is correctly grounded by regularly checking and cleaning the suspension points and contact points.
2. Incorrect application settings
Inappropriate application parameter settings can lead to excessive powder deposits. Recommendation: Optimise the voltage, powder flow and distance to the workpiece surface in accordance with the manufacturer's specifications.
3. Contaminants in the powder or in the air
Dust or other contaminants can mix with the powder and cause deposits. Recommendation: Use clean powder and ensure a clean working environment with suitable filtration systems.
4. Inadequate air flow in the booth
Insufficient air flow can prevent excess powder from being removed effectively. Recommendation: Check and optimise the air flow in the coating booth to ensure efficient removal of excess powder.
Conclusion
By observing these points and regularly maintaining your powder coating system, you can effectively prevent powder deposits on the object and improve the quality of your coatings. Further detailed information can be found on the official GEMA website: GEMA Tips & Tricks – Powder deposits on the object.
