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What is the most effective way to use an airless sprayer?

Release Date:

Jul 16,2021

Airless sprayers have been used in large-scale coating projects for many years, yet certain fundamental principles of painting are often overlooked due to poor communication between manufacturers and contractors. Understanding these key concepts is essential for every member of the project team.

　 Airless sprayer It has been used for many years in large-scale coating projects, yet some fundamental principles of painting are often overlooked due to poor communication between manufacturers and contractors. Understanding these principles is essential for every member of the project team.

　Airless sprayer The operational techniques focus on the following four aspects:

　1) Nozzle wear

　2) Excessive work pressure

　3) Select the appropriate nozzle

　4) Diversity of coating thicknesses

　Due to Airless sprayer Various factors, including nozzle selection, operating pressure, and variations in coating thickness, can affect the quality of airless spraying.

　 Airless sprayer Nozzle wear: Nothing wastes paint more quickly than using a worn‑out nozzle tip for even a short period. Most specifications call for coatings to achieve a low dry film thickness; a worn nozzle increases the average DFT of the cured coating and compromises quality. If the spray pattern is circular, the nozzle is completely worn out—meaning the paint is being expelled through a round orifice, producing a clearly visible circular pattern. By contrast, a properly atomized spray should form a thin rectangular pattern. This shape arises from the pressure exerted by the paint as it passes through the circular orifice relative to the metal substrate; the greater the pressure, the flatter the fan and the wider the spray pattern.

　In fact, Airless sprayer of the Two small metal “wings” are used to “squeeze” and shape the spray pattern. The metal components of the nozzle become worn by the paint pigment; the more severe the wear, the rounder the spray pattern becomes. The circular orifice in the nozzle grows increasingly round, causing paint to accumulate rapidly on the surface and making it difficult to control. At this point, the coating fails inspection. However, before the “wings” are installed, the nozzle ensures that the accumulated paint flows evenly across the entire width of the spray fan. Consequently, the amount of paint at the center of the fan increases. If the spray pattern is uneven, the variability of the dry film thickness (DFT) rises, and achieving a low DFT then requires applying additional paint.

　There’s also a simple test to determine whether the nozzle is worn. Hold a piece of cardboard (or another flat surface) vertically. With the spray gun in hand, lightly spray onto the cardboard’s surface; excess paint may then drip or run off. Inspect the resulting dot‑pattern marks: if the marks are uniform, with consistent spacing and equal length, the nozzle is in good condition. If the droplet mark at the center of the pattern is longer than those at the edges, the nozzle is worn and should be replaced.

　This simple experiment should be performed at least once a day. Given how straightforward this method is and how much it can save in costs, why don’t most painting professionals make it part of their daily routine? The answer is simple: sometimes they overlook the true cost of the job, focusing too much on equipment expenses and other priorities while neglecting paint costs and proper workmanship standards.

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