Introduce the features and applications of high-pressure airless spraying

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Introduce the characteristics and applications of high-pressure airless spraying. Compressed air with a pressure of 0.39–0.59 MPa is used to drive a high-pressure pump, which draws in the paint and pressurizes it to high levels (usually around 11–20 MPa). When this pressurized paint is released through a special nozzle, it expands rapidly upon entering the atmosphere, turning into extremely small paint particles that are sprayed onto the surface to be coated, thus forming a uniform coating layer. This method of coating is known as high-pressure airless spraying. Compared with conventional compressed air spraying, it has the following advantages: (1) Wide range of applications. Coatings suitable for air spraying can generally be applied using high-pressure airless spraying. In addition, it can also be used for spraying high-viscosity coatings. It saves organic solvents and expands the variety of coatings that can be used. ⑵High painting efficiency. With high-pressure airless spraying, each gun can cover 3 to 5 square meters per minute or more; it is particularly suitable for painting large areas and large objects, thereby further increasing labor productivity. ⑶The painting quality is good. The high-pressure air-free spraying method does not use compressed air, which eliminates the impact of moisture, dust, and other impurities present in compressed air on the quality of the coating layer; as a result, the coatings produced by this method have good adhesion and excellent appearance. It can penetrate gaps or recesses with just one application, making it especially suitable for rough surfaces after rust removal. ⑷Pollution has been reduced. High-pressure airless spraying produces much less paint mist compared to conventional air spraying, which reduces the emission of harmful substances such as organic solvents, lessens air pollution, and improves working conditions at the painting site. Currently, high-pressure airless spraying is widely used for painting ships, locomotives and vehicles, chemical processing equipment, bridges, machine tools, automobiles, large buildings, and more. Its drawback is that cleaning the high-pressure hose is rather troublesome.