Electrostatic Spraying Technologies
There are several key factors that must come collectively with a view to use electrostatic guns successfully. First, you ought to select the right atomization technology in your coating application desires. There are numerous electrostatic atomization technologies to pick out from. The oldest and likely most not unusual are the air spray electrostatic guns. These weapons use compressed air as their primary and sole manner of atomizing the coating. These guns are most normally used in programs that require a “Class A” car end. The guns provide a variety of control at the gun including fluid float by use of the fluid needle adjustment knob and fan manage thru the use of the fan adjustment knob. In addition, the quantity of fluid can be managed by way of how some distance again the operator pulls the trigger. This is known as “feathering” the gun.
The essential supply of fluid manage is determined by way of the fluid stress from a low-stress pump, the air going right into a strain pot or by means of a fluid regulator established close to, or within the spray booth. The viscosity of the coating and the scale of the fluid nozzle additionally have an effect on the fluid glide. Although air spray electrostatic weapons have tremendous atomization, they’re adding the least efficient of the electrostatic guns. This is because of the ability use of high air pressure to atomize the coating. The use of excessive air strain can defeat the electrostatic attraction by using forcing the charged particles of paint beyond the element or by means of creating immoderate get better or overspray.
A variation of the air spray electrostatic gun is the HVLP electrostatic gun. The gun operates almost identically to the air spray gun besides that it makes use of less atomizing air stress. Instead, the gun makes use of greater cubic toes of compressed air or CFM. The end result is a softer spray sample which lowers the velocity at which the paint debris tour. This allows for more of the charged debris to stay inside the electrostatic area which facilitates to improve transfer efficiency. Like any HVLP gun, a few coatings may be too viscous or the utility charge may be too excessive, which may additionally make it difficult for the HVLP electrostatic gun to provide high productiveness and perfect end nice for a few programs. In addition, HVLP guns generally require greater CFM that could result in increased electrical expenses for compressed air.
For the application of very viscous materials or for terribly high software prices, a few manufacturers use airless electrostatic weapons. These guns use pumps to create very excessive fluid stress which is the primary manner of atomizing the coatings. When the gun is brought on, the excessive fluid strain is authorized to escape into the atmosphere through a tungsten carbide tip this is cut to form an elliptical spray sample. The size of the pattern and the amount of fluid leaving the gun are managed via the top. The viscosity of the coating and the fluid strain used additionally impacts the application fee.
In standard, airless generation does now not offer the equal stage of atomization as air spray or HVLP electrostatic weapons but they paintings properly for some coatings, especially while spraying massive products at excessive fees of speed. Tip plugging may be a problem when spraying substances that include a combination such as silica or zinc. Air-assisted airless electrostatic is a hybrid model of the airless electrostatic and the air spray electrostatic. These weapons use each fluid stress and air stress to atomize the coating. Pumps are needed to create fluid pressure. Since those types of weapons use lower fluid stress than airless and less air strain than air spray, they can offer organizations a terrific compromise between the velocity of an airless and an end quality toward the air spray electrostatic. The quality component is that this era is typically extra green than either the air spray or the airless electrostatic guns. In a few instances, they are even extra efficient than the HVLP electrostatic weapons.
However, air-assisted airless electrostatic guns do not provide the equal level of manipulating on the gun as the air spray or HVLP electrostatic guns. This is due to the fact the fluid sample cannot be completely adjusted from very slender to very huge without converting the top. Also, just like the airless electrostatic gun, the operator can’t feather the gun. This may be difficult while spraying very complicated substrates in which the operator wishes that type of manipulate at the gun. Tip plugging can also be a difficulty with a few mixture stuffed substances.
The maximum efficient guide electrostatic spray gun is a handheld rotary atomizer. These guns use centrifugal forces and a totally excessive voltage electrostatic area to atomize the material. Since there may be no atomizing air the paint particles travel very slowly thru the electrostatic subject. The end result is very excessive transfer performance. However, the gun places out a doughnut fashioned spray sample which does now not paintings well for maximum production completing packages and is used in most cases for the on-website refinishing industry.