As a commonly used spraying tool, automatic spray guns may encounter various usage failures in daily use. I often have friends tell me that the automatic spray gun is not working properly again. Now, let's talk about the common spray width defects of automatic spray guns and corresponding solutions.
1、 Spray defect: spray deformation
Reason: The air holes (fan-shaped holes or auxiliary atomization holes) on the hood are blocked by dry and solid paint, causing abnormal airflow to deform the spray amplitude; Incorrect inlet air pressure (too high/too low), causing the spray amplitude to be disconnected or too small.
Solution: Follow the cleaning instructions to clean the air holes on the spray gun and hood; Adjust the intake pressure of the spray gun to normal air pressure.
2、 Spray width defect: narrow in the center of the spray width, large at both ends
Reason: The viscosity of the paint is too low, and the paint viscosity does not match the spraying pressure; The spraying pressure is too high, and the pressure of the fan-shaped hole is too high, which causes the central depression of the spraying amplitude; The atomization hole is blocked, which causes relatively more air to flow into the fan-shaped hole, causing the center of the spray amplitude to sag.
Solution: Adjust the viscosity of the paint or use a suitable caliber nozzle; Adjust the normal intake pressure of the automatic spray gun; Use suitable cleaning tools to clean the air holes in the hood, and replace the nozzle kit if necessary.
3、 Spray defect: The paint is concentrated in the center, and the spray cannot be dispersed
Reason: The spraying air pressure is too low, and the air pressure of the fan-shaped hole is too low to press out the fan surface; The viscosity of the paint is too high, and the air pressure in the fan-shaped hole is not strong enough to press the high viscosity paint into a fan-shaped surface; The nozzle is damaged and the spray amplitude adjustment knob is not turned on.
Solution: Adjust the normal intake pressure; Adjust the viscosity of the paint or use a nozzle with a suitable diameter. If the nozzle is damaged, the nozzle kit should be replaced; Check if the spray amplitude adjustment knob is fully open.
4、 Spray defect: The spray is bent in a banana shape
Reason: One side of the fan-shaped hole is blocked or deformed, and the pressure of the fan-shaped holes on both sides is inconsistent; The blockage of the atomization hole causes air to flow into the fan-shaped hole, resulting in an increase in air pressure on one side of the fan-shaped hole.
Solution: Use a dedicated cleaning kit to clean the hood of the automatic spray gun, and replace the nozzle kit if necessary.
5、 Spray defect: The wet area in the spray is biased to one side
Reason: Blockage or deformation of fan-shaped holes or atomization holes, resulting in uneven airflow causing the atomized paint to lean to one side; The nozzle is damaged, and the gap between the central atomization hole of the hood and the nozzle is uneven, causing the atomized paint to lean to one side.
Solution: Use a dedicated cleaning kit to clean the hood, and replace the nozzle kit if necessary.
6、 Spray defect: The spray width is twisted, inclined, or S-shaped
Reason: The fan-shaped holes are blocked or deformed, and the diagonal fan-shaped holes on both sides are blocked or deformed, causing the spray width to tilt.
Solution: Use a dedicated cleaning kit to clean the hood, and replace the nozzle kit if necessary.
7、 Spray defect: discontinuous spray, bouncing
Reason: The nozzle of the automatic spray gun is not tightly installed, the nozzle and air distribution ring are not completely sealed, and the air runs into the paint passage; The nozzle or air distribution ring is not cleaned thoroughly, and paint residue prevents the nozzle and air distribution ring from being completely sealed; The damage to the sealing surface of the air distribution ring affects its sealing with the nozzle; The vent of the gun pot is blocked, which creates a vacuum and sucks air from the nozzle into the paint channel.
Solution: Use an original wrench to tighten the nozzle, use a dedicated cleaning kit to clean the nozzle, and replace the air distribution ring. Clean the vent hole of the gun pot and replace it if necessary.