Spray paint machines are spray guns that are either automated or hand-held. Most common spray guns use compressed air to spray an even coat of paint and are typically used to paint large surfaces because they are easy to use and can apply coats of paint faster than paintbrushes. Interchangeable heads allow for different spray patterns.
Conventional Spray Gun
Conventional spray guns use compressed air. Two passages inside the gun separate the air and the paint while they travel through the gun. The air and the paint meet in the air cap, where they mix and the paint atomizes. The paint releases in a controlled spray onto a surface.
Conventional spray guns provide a fine finish and atomization quality, although the speed of the compressed air can create overspray and cause paint to bounce back. To counter some of this, the spray’s width can be easily adjusted even while spraying. Conventional spray guns are usually used for plastics or automobiles.
HVLP Spray Gun
HVLP stands for High-Volume Low-Pressure. This type of spray gun uses a conventional spray with a high volume of air that’s delivered at a low pressure to atomize paint. The paint particles are at a low velocity, which causes less paint loss in bounce-back
Airless Spray Machine
Airless spray machines are gasoline-, electric-, or pneumatically operated. They’re called “airless” because the paint is atomized only by hydraulic pressure from the spray tip. They’re generally used for applying protective coatings on construction vehicles, ships and bridges because they’re designed to quickly cover large surfaces.
Air-Assisted Airless Spray Gun
Air-assisted airless guns partially atomize paint with a tip similar to an airless tip, and fully atomize once a small amount of compressed air from the air nozzle hits the paint. They create an atomized spray that is finer than a standard airless spray, which provides a better finish for furniture.
Any type of spray paint machine can be converted to electrostatic. The electrostatic machine adds a controlled negative charge to the atomized paint, which attracts the paint to the grounded surface and creates a wrap effect, painting the sides and the back of the surface and reducing overspray. Electrostatic spray guns are typically used to paint metal components on fences, poles and furniture, along with automobile parts.
Automated Spray Systems
In an automated flat-line spray system, objects such as a drawer or a cabinet door are placed on a conveyor belt and led to a flat-line machine. The spray guns are situated above the objects and are in motion to evenly coat the objects.
In an automated linear spray system, objects are laid flat on a conveyor belt into a linear spray system and are painted once they’re directly beneath the spray guns. They are designed to recover paint that isn’t applied on objects to be reused. Linear spray systems are typically used for baseboards, window frames and trim stock.