What Is Airless Spray Painting
Spray painting is commonly employed because it produces a uniform and smooth finish on a wide range of substrates.
How do Airless paint sprayers work?
The paint is atomized into tiny droplets and then blasted into the surface using a spray gun. An airless mechanism basically splits up liquid into small droplets and this process of atomisation is achieved by pushing fluid through a small nozzle called a spray tip. Because the paint is pumped through the spray tip under high pressure, there is enough energy to break up the surface tension bonding the liquid together. The paint leaves the spray gun in a high-speed stream but becomes fragmented into tiny droplets as soon as it comes into contact with the air.
Many customers are not aware of the benefits of using spray technology over traditional paint brush or roller methods of application. Conventional painting techniques don’t always provide a smooth finish. Where circumstances are we carry out airless spray-painting methods, and subsequently all masking procedures as required prior to painting, and it yields great results providing a consistent coating and smooth finish to the surfaces with a high-quality finish.
How does a spray gun work?
A pump is used to bring the paint material to a pressure of up to 250 bar and then through an airless spray gun. When the paint valve (gun) is opened, the paint is forced through an opening in the airless tip of the right size relevant to the requirements. Atomisation is created through the pressure difference between the coating material and the atmosphere.
The flow rate and spray jet width are determined by the spray tip.
To Choose the right tip for your spray project.
Choose a tip with an orifice size rated for the paint or coating you’ll be spraying. Light coatings such as lacquers, stains, and enamels require a small tip, while heavier coatings such as texture require larger spray tips. Many paint manufacturers will specify recommended spray tip sizes on the container or product specification sheet.
Size the spray tip according to the tip rating of your sprayer. Make sure that the sprayer can support the tip you are planning to use. If you plan on using multiple spray guns on your job, pick a tip size that matches the multiple-gun tip rating of your sprayer.
Tip Selection: understand the numbers
Most spray tips are identified by a three-digit code. The first number, when multiplied by 2, tells you how wide of a fan the tip will create when sprayed at a distance of 12 inches from the surface. The second two numbers are the orifice size of the tip, which is thousands of inches in size, and determines how much fluid will leave the spray tip. For example, a 515 tip will spray a 10-inch-wide fan and have a 15-thousandth of an inch orifice. It’s the combination of fan width and orifice size that determines how thick of a coating you’ll spray. Case in point – a 317 tip and a 517 tip both have the same orifice size – 17-thousandths of an inch. But, the 517 tip sprays a 10-inch-wide fan, while the 317 sprays a 6-inch-wide fan. Because the same amount
of paint is leaving the orifice of the spray tip, but is being dispersed across a wider fan, the 517 tip will deliver a thinner coating with less mil build.
