Introduction of common spraying methods for water-based coatings - air spraying!

In the construction of water-based industrial coatings, one of the most important coating methods is spraying

Generally, the spraying methods of water-based coatings can be divided into four categories, namely air spraying, airless spraying, air-mixing spraying and electrostatic spraying.

Air spraying principle:

The principle of the air spraying method is to use the compressed air flow between 0.

Air spray guns are divided into gravity spray guns, siphon spray guns and pressure-feed spray guns according to different feeding methods

Figure 1 Gravity Air Spray Gun

Figure 1 is a gravity air spray gun, the paint tank is located on the upper part of the spray gun, the paint is sprayed from the paint nozzle by its own gravity and the negative pressure formed by the front end of the paint nozzle, and mixed with air for atomization

Figure 2 Siphon feed gun

Figure 2 shows a siphon feed spray gun (also known as a suction-on spray gun), which consists of a spray gun and a siphon paint cup attached below the spray gun

Figure 3 Pressure Feed Air Gun

Figure 3 The pressure feeding spray gun supplies paint from a separate paint pressurized tank.
Increasing the pressure of the pressurized tank can supply paint to several spray guns at the same time.
The paint nozzle of this spray gun and the core hole of the air cap are located on the same plane, or It is slightly concave inward than the center hole of the air cap, and it is not necessary to form a negative pressure at the front end of the paint nozzle
.
Pressure feed guns are suitable for applications where a lot of paint is used and continuously sprayed
.

01

advantage:

1.
The construction equipment is simple and cheap, the coating efficiency is high, and the coating film quality is good
.

2.
It has good atomization, flexible operation and strong adaptability.
It can be applied to different types and shapes of paints and workpieces, and is not limited by the site
.

02

shortcoming:

1.
The paint splashes a lot and the utilization rate is low
.

2.
The thickness of the coating film is too thin, which requires multiple spraying, which has a certain impact on the construction efficiency
.

3.
Inhalation by negative pressure, high viscosity paint cannot be applied
.