Higher film build on the edges of the part due to wrap, therefore uneven flow
Spray gun settings are not optimal
Reduce voltage to suit part. Adjust/increase distance. Adjust powder flow
Powder Coating has too much flow, particularly if the bottom edges are heavy, or dripping and the upper edges show signs of the powder pulling away.
May be film thickness dependent; ensure the film build is not too high. Contact us for a sag resistant product.
Metallic effects: picture framing occurs when metallic particles build up around the edge of a component, which gives the edge a different appearance to the rest of the component it is usually caused by inconsistent application techniques
If automatic guns are being used, the reciprocators should be set so that they do not ‘dwell’ opposite the edge of the panel at the top and bottom of the stroke . Additionally, the gap between components and the track should be kept as small as possible.
If manual application is being used, the spray action should be consistent and very high film thickness should be avoided.
An inconsistent colour effect, usually in textured effects, metallic products, or products with lower opacity such as whites and yellows. The colour can be seen to change in regular patterns, or 'stripes'.
Reciprocator speed is too low,
The reciprocator speed should be increased slightly.
Incorrect gun nozzle used
Check that the gun nozzle slots are correctly orientated, i.e. horizontal to give as wide a spray pattern as possible.
Where manual application is being used, the spraying action is inconsistent.
The spraying action should be changed. Carry out tests to practice the best methods of reducing the effect.
Gun to part distance too close
In some circumstances the effect can be reduced by increasing gun to workpiece distance.