Coating defects and treatment methods
Spray coating technology often has various defects in the coating process, the causes of these defects and the corresponding treatment methods are as follows:

Bubble: Cause
The paint viscosity is too high.

The filter of the coating machine failed.

Paint conveying pressure is too high.

The paint circulates in the device for too long, resulting in increased viscosity and bubbles.

The distance between the knife edge of the spray head and the surface to be coated is too large, resulting in increased impact force when the paint is in contact with the surface.

Treatment method:

Use a thicker paint or add an appropriate amount of defoamer.

Check and repair the filter.

Adjust the pressure of the paint transfer pump.

Adjust the viscosity of the paint frequently.

Adjust the distance between the nozzle edge and the coated surface to an appropriate range, generally 10cm.

Coating defects and treatment methods

Whiteness: indicates the cause
The solvent was mixed with water.

The construction environment humidity is too high.

The surface of the coated substrate contains water vapor.

Low boiling point solvent is added too much.

Treatment method:

Check the quality of the solvent.

Control relative humidity below 80%.

Remove moisture from the surface of the coated substrate.

Control the amount of low boiling point solvent added.

Curtain break: Cause
Paint viscosity is too low.

Paint pressure is too low.

There are particles in the bottom seam edge.

The gap of knife edge is too large, and the conveying pressure of paint is too small.

Treatment method:

Increase the viscosity of the paint.

Increase the pressure of the paint.

Remove particles from bottom seam edge.

Adjust the edge clearance correctly to control the conveying pressure of the coating.

Coating defects and treatment methods

Coating discontinuity: causes
The wind speed at the construction site is too high.

Too much ventilation above the nose.

The distance between the knife edge of the shower head and the coated surface is too large.

The conveyor belt has runout and transition, and there is paint on the roller.

Paint viscosity is too low.

Treatment method:

Control the wind speed at the construction site.

Reduce the power of the fan.

Lower the height of the nose.

Check the delivery system.

Adjust the viscosity of the paint.

Side flow hanging and paint forming: cause
A coating amount is too thick.

Levelness difference between conveyor belt and drying rack.

Coating defects and treatment methods

Treatment method:

Control the amount of coating applied.

Check the levelness of the conveyor belt and drying rack.

Understanding the causes of defects in these coating technologies and the corresponding treatment methods will help to improve the coating quality and ensure that the coating can meet the expected standards in appearance and performance. The effect of these defects on the coating result can be effectively reduced by appropriate treatment methods.