(1) Principle of air spraying
Air spraying is a painting method that relies on compressed air flow to generate negative pressure at the paint outlet, the paint automatically flows out and is fully atomized under the impact and mixing of compressed air flow, and the paint mist is sprayed on the surface of the workpiece under the push of the airflow to deposit.
(2) Characteristics of air spraying
Air spraying is an application method originally developed for fast drying paints such as nitro lacquer. For coatings with poor brushability, this method is easy to apply, and it has the following characteristics:
(1) High coating efficiency, 150~200m2 can be sprayed per hour, which is 8~10 times of brush coating;
(2) The thickness of the coating film is uniform, smooth and flat, and the appearance is good in decoration;
(3) Strong adaptability, suitable for various coatings and workpieces of various materials and shapes, not limited by the site (but dust is not allowed in the environment), as long as there is a power supply, it can be used. It is a widely used coating at present. Installation method, especially suitable for the construction of quick-drying paint.
The disadvantages of air spraying are:
(1) The amount of diluent is large, and the solvent volatilizes a lot during operation, which is easy to cause air pollution. The operating environment is harsh, and it is easy to cause accidents such as combustion and explosion. The operating point needs to have good ventilation facilities;
(2) The utilization rate of paint is low, generally only 50%~60%, and only 15%~30% for small parts. The scattered paint mist further deteriorates the working environment. Mass production should be carried out in a special spray booth.
