Reasons for low powder absorption rate of powder spray gun

Reasons for low powder absorption rate of powder spray gun

Sometimes we may encounter the following problems during the powder spraying process.

The powder spray gun can spray powder normally, but no powder or very little powder is adsorbed to the metal surface. This is one of the common problems of many spray guns in the process of electrostatic spraying, which not only wastes powder but also affects the efficiency of powder spraying.

Why?
The main reasons are as follows:
1. The powder spraying sleeve (Venturi tube) in the powder pump is worn;
2. The voltage or current setting of the spray gun is too low;
3. The atomization wind parameter is set too high;
4. Water enters the spray gun, high-voltage electrostatic short circuit, the system is in a protection state, and the output voltage is very low;
5. The powder used is not electrostatic powder spraying, the powder is damp, or the powder is of poor quality;
6. The gun control unit, the workpiece, and the ground are not connected properly (poor grounding)
7. Faulty gun, faulty gun controller, or disconnected cable between gun and gun controller.

How to solve?
For each of the above cases we have the following solutions:
1. Check and replace the powder spraying sleeve (Venturi tube);
2. Set the spray gun voltage and current according to the manual;
3. Reduce or close the atomizing air;
4. Disassemble the spray gun and dry it fully, check and solve the source of moisture, and ensure that the compressed air is dry;
5. Replace the qualified electrostatic powder;
6. Check the ground connection;
7. Overhaul spray gun, spray gun controller, spray gun cable;