Imperfect
Signs |
Possible
Reasons |
Solutions |
| 1. Electric amount is low
and powder is difficult to pack. |
1. Electricity provided by high
tension supply is insufficient.
2. The earthing is not good.
3. The compressed air quantity is too large that the powder
is blown down or about.
4. The powder granularity is too thin.
5. The air temperature is too high. |
1. Systematically check circuit.
2. Clear away the sundries on earth wire.
3. Appropriately insulate spray booth to reduce air convection.
4. Add new powder and reduce reclaimed powder amount.
5. Moisture in the air will decrease the electric amount of
powder particles so please control the temperature of spraying
area. |
| 2. Powder rebounds from workpiece
surface for electricity repulsion. |
1. The voltage is too high.
2. The spray gun is too close to workpiece.
3. The earthing is not good.
4. The powder is too thin to adhere to workpiece surface. |
1. Reduce voltage and air quantity.
2. Distance between back long spray gun and workpiece
3. Clear away the sundries on earth wire.
4. Add new powder and reduce reclaimed powder amount. |
| 3. Faraday dead angle is difficult
to paint and penetrating power is bad. |
1. Powder yield is too low.
2. The earthing is not good.
3. The voltage is too high.
4. The place of spray gun is not good.
5. The powder-spraying scope is too extensive. |
1. Reduce voltage and air quantity
to increase powder yield.
2. Adjust the place of spray gun to help powder cloud directly
spray towards recession.
3. Choose smaller baffle or proper nozzle.
4. If dead angles are many and deep, please try friction gun
equipment. |
| 4. Powder injection is not homogeneous.
|
1. The air pressure is inadequate.
2. Pipeline fault such as block, applanation and kink.
3. Massive objects block the spray gun. |
1. Clear away pipeline, flow meter and spray
gun.
2. Check air supply to prevent the moisture arousing powder
agglomeration.
3. If new powder agglomerates, please griddle again or adopt
new powder and then spray. |
