What are the causes and solutions for the defects of the automatic spray gun? (1)

Update:30-09-2020
Summary:

As a commonly used spraying tool, automatic spray guns […]

As a commonly used spraying tool, automatic spray guns will encounter various failures during daily use. There are often friends who tell me that the automatic spray gun is not working well. Let me tell you about the common spray pattern defects of the automatic spray gun and the corresponding solutions.
1. Spray pattern defect: spray pattern deformation
Reason: The air holes (fan-shaped holes or auxiliary atomization holes) on the hood are blocked by dry paint, so that the abnormal airflow deforms the spray pattern; incorrect air inlet pressure (too high/too low) causes the spray pattern to disconnect Or too small.
Solution: Clean the air holes on the spray gun and hood according to the cleaning instructions; adjust the air inlet pressure of the spray gun to normal air pressure.
2. Spray pattern defects: narrow center of spray pattern and large ends
Reason: The paint viscosity is too low, the paint viscosity does not match the spraying air pressure; the spraying air pressure is too high, the fan-shaped hole air pressure is too high, so that the center of the spray frame is sunken; Make the center of the spray fan sunken.
Solution: Adjust the paint viscosity or switch to a nozzle with a suitable caliber; adjust the normal air inlet pressure of the automatic spray gun; use a suitable cleaning tool to clean the air hole of the hood, and replace the nozzle set if necessary.
3. Defects of spray pattern: the paint gathers in the center, and the spray pattern cannot be dispersed
Reason: The spraying air pressure is too low, and the fan-shaped hole air pressure is too low to press out the fan surface; the paint viscosity is too high, and the fan-shaped hole air pressure is not strong enough to press the high-viscosity paint into a fan surface; the nozzle is damaged and the spray amplitude adjustment knob is not turned on.
Solution: Adjust the normal air inlet pressure; adjust the paint viscosity, or switch to a nozzle with a suitable caliber. If the nozzle is damaged, replace the nozzle set; check whether the spray amplitude adjustment knob is fully opened.

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