Inconsistent colour

Potential Cause

Spray gun settings are not optimal

Solution

Reduce voltage to suit part.  Adjust/increase distance.  Adjust powder flow

Potential Cause

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.

Solution

May be film thickness dependent; ensure the film build is not too high. Contact us for a sag resistant product.

Potential Cause

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

Solution

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.

Potential Cause

Reciprocator speed is too low,

Solution

The reciprocator speed should be increased slightly.

Potential Cause

Incorrect gun nozzle used

Solution

Check that the gun nozzle slots are correctly orientated, i.e. horizontal to give as wide a spray pattern as possible. 

Potential Cause

Where manual application is being used, the spraying action is inconsistent. 

Solution

The spraying action should be changed.  Carry out tests to practice the best methods of reducing the effect.

Potential Cause

Gun to part distance too close

Solution

In some circumstances the effect can be reduced by increasing gun to workpiece distance.