The Basics of Airless Spraying

The Definitive Guide to Airless Spraying Basics and Beyond!

 

Defining Airless

Airless spray atomizes, or breaks up fluid into small droplets without the use of compressed air. In an airless system, fluid is pumped under high pressure through a spray tip. The tip size and pressure is what determines the material flow rate. The tip also creates the fan pattern. In contrast, air spray systems injectcompressed air into the fluid stream of paint to achieve atomization. more info

 

Advantages of Airless Sprayers

In airless spray, the fast moving high-pressure liquid stream provides the energy necessary to overcome the fluid’s viscosity (resistance to flow) and surface tension (a force that bonds the surface of a liquid together) to form a fine spray. In the depiction of spray from a gun, high pressure forces fluid through a small nozzle (spray tip). The fluid emerges as a solid stream (sheet) at a high speed. When the solid stream hits the air, it becomes disrupted. This disruption breaks the fluid into fragments initially, then ultimately very small droplets that form the spray pattern.

  • Speed—airless spraying is faster, thus, more jobs can be completed in less time, using less labor. Airless spraying is up to 4 times faster than brushing or rolling.
  • Quality—airless sprayers produce an even coat of paint on all types of surfaces, leaving a high quality finish.
  • Versatility—airless sprayers can be used for a wide range of coating materials, including interior and exterior jobs, and can easily be transported from job site to job site

 For more information view our informational PDF The Basics of Airless Spraying

Air-Assisted Airless

Material is delivered to the gun at lower pressure than traditional airless (500 – 1500 psi vs. 1500 – 3000 psi) and is partially atomized through a small tip. Full atomization is achieved by adding a small amount of air (5 – 35 psi) to the edges of the spray fan – resulting in a softer pattern, more control, higher transfer efficiency, and less overspray. more info

 

Airless Spray Tips

This, small, exchangeable part plays a big role. An airless spray tip:
• Determines the fluid flow = the amount of coating applied
• Determines the spray pattern (fan width) Selecting the correct spray tip for the job is an important decision.

For more information view our informational PDF The Basics of Airless Spraying

 

Airless Spray Techniques

A good spray pattern indicates that the paint or coating is completely atomized and distributed evenly on the surface. Several techniques help determine the quality of the spray pattern and the quality of the finish.

  • Adjusting the pressure
  • Aiming of the spray pattern
  • Movement of the spray gun

The following techniques ensure a long-lasting quality finish. Adjusting the pressure for spraying It is best to spray at the lowest pressure that completely atomizes the coating. The pressure control should be set at a low-pressure setting and slowly increased until the paint is completely atomized. If the spray pattern has fingers or tails, then the pressure should be increased. more info

 

How to Basics of Airless Spraying





For more information
view our informational
PDF
The Basics of Airless Spraying