With an electrostatic spray gun, the droplets pick up the charge from an electrically charged electrode at the tip of the gun. The attraction between paint droplets and the part is strong enough to cause paint overspray that misses the part to curve back, which contributes to the high transfer effiencies. The charged droplets tend to be attracted to the sides of the recess and sharp edges instead of penetrating to the bottom. All electrically conductive materials near the spray area such as the material supply, containers, and spray equipment must be grounded to prevent static buildup. All hangers, conveyors, etc. must be kept clean to ensure conductivity to ground.
Charges build up on ungrounded surfaces.
Operators grounding out these surfaces may receive a severe electrostatic shock. Rotary Atomization Summary Rotary atomizers are one of the possible methods of atomization used with electrostatic coating processes. Instead of air or fluid pressure, rotary atomizers use centrifugal force to atomize coating material. As a general rule of thumb, the faster the rotational speed, the greater the centrifugal force and the finer the atomization. The combination of high rotational speeds and electrostatic charging voltage atomize the coating into extremely fine particles to ensure a high-quality finish.