There are several key factors that must come together in order to use electrostatic guns effectively. First you have to select the proper atomization technology for the coating application needs. There are several electrostatic atomization technologies to select from. The oldest and probably most frequent would be the air spray electrostatic guns. These guns use compressed air as their primary and sole method of atomizing the coating. These guns are most commonly found in applications that need a “Class A” automotive finish. The guns offer plenty of control at the gun such as for example fluid flow by use of the fluid needle adjustment knob and fan control through the utilization of the fan adjustment knob. In addition, the amount of fluid can be controlled by how far back the operator pulls the trigger. This is referred to as “feathering” the gun.
The key supply of fluid control is determined by the fluid pressure from a low-pressure pump, the air starting a force pot or with a fluid regulator mounted near, or in the spray booth. The viscosity of the coating and how big is the fluid nozzle also affect the fluid flow. Although air spray electrostatic guns have great atomization, they are also minimal efficient of the electrostatic guns. spray on protection This is because of the potential use of high air pressure to atomize the coating. The utilization of high air pressure can defeat the electrostatic attraction by forcing the charged particles of paint past the part or by creating excessive bounce back or overspray.
An alternative of the air spray electrostatic gun is the HVLP electrostatic gun. The gun operates almost identically to the air spray gun except that it uses less atomizing air pressure. Instead, the gun uses more cubic feet of compressed air or CFM. The end result is a softer spray pattern that lowers the velocity at that your paint particles travel. This allows for more of the charged particles to remain in the electrostatic field which supports to improve transfer efficiency. Like any HVLP gun, some coatings might be too viscous or the application form rate might be too high, which may allow it to be hard for the HVLP electrostatic gun to offer high productivity and acceptable finish quality for many applications. In addition, HVLP guns usually require more CFM which could result in increased electrical costs for compressed air.
For the application form of very viscous materials or for very good application rates, some manufacturers use airless electrostatic guns. These guns use pumps to generate very good fluid pressure that will be the principal method of atomizing the coatings. When the gun is triggered, the high fluid pressure is allowed to flee in to the atmosphere via a tungsten carbide tip that is cut to make an elliptical spray pattern. How big the pattern and the amount of fluid leaving the gun are controlled by the tip. The viscosity of the coating and the fluid pressure used also affects the application form rate.
In general, airless technology doesn’t provide the same level of atomization as air spray or HVLP electrostatic guns but they work well for many coatings, particularly when spraying large products at high rates of speed. Tip plugging is an issue when spraying materials that contain an aggregate such as for example silica or zinc. Air-assisted airless electrostatic is really a hybrid version of the airless electrostatic and the air spray electrostatic. These guns use both fluid pressure and air pressure to atomize the coating. Pumps are required to generate the fluid pressure. Since these types of guns use lower fluid pressure than airless and less air pressure than air spray, they can offer companies a great compromise involving the speed of an airless and a finish quality nearer to the air spray electrostatic. The very best part is this technology is usually more efficient than either the air spray or the airless electrostatic guns. In some cases they are even more efficient compared to HVLP electrostatic guns.
However, air assisted airless electrostatic guns don’t offer the same level of control at the gun while the air spray or HVLP electrostatic guns. The reason being the fluid pattern cannot be fully adjusted from very narrow to very wide without changing the tip. Also, just like the airless electrostatic gun, the operator cannot feather the gun. This might be problematic when spraying very complex substrates where the operator needs that kind of control at the gun. Tip plugging can be a concern with some aggregate filled materials.
The most efficient manual electrostatic spray gun is really a hand held rotary atomizer. These guns use centrifugal forces and a very good voltage electrostatic field to atomize the material. While there is no atomizing air the paint particles travel very slowly through the electrostatic field. The end result is very good transfer efficiency. However, the gun puts out a doughnut shaped spray pattern which doesn’t work well for some production finishing applications and is employed mostly for the on-site refinishing industry.