Liquid Electrostatic System Operation Goal: Maintaining Maximum Efficiency

Joel D. Rupp, System Technical Representative
ITW Ransburg Electrostatic Systems, 320 Phillips Ave., Toledo, Ohio 43612
(419) 470-2062/2060

Bells And Disks Presentation
Wednesday, April 27, 1994 - 9:45 TO 10:10 AM

Copyright permission received on June 18, 1996 to place this on the Internet as edited by Ronald Lee Still.

1) Make sure all parts to be coated are properly grounded.

Tip: Periodically check parts with a megohm meter (megger) to ensure that there is no more than 1 megohm resistance to ground.

2) Check paint for proper electrical resistance.

Tip: Bell and disk Systems operate best when the material measures -05 to 1 megohms of resistance. Air atomized guns perform well with less conductive paints .1 to infinity.

3) The wetter the better.

Tip: Wetter or slower evaporating paint formulations are able to maintain an electrical charge for a longer period of time. This can produce increased electrostatic wrap.

4) Never over atomize.

Tip: Keep rotational speeds (on bells and disks) or atomizing air (on air spray guns) set at the minimum required to obtain sufficient break up. Over atomizing creates excessive overspray.

5) Keep all components clean.

Tip: Frequently inspect the system and clean with a non conductive solvent such as Xylene, Toluene, or Naptha. This is especially critical on high voltage cables, high voltage cable isolation rods, and gun support insulator rods.

6) Maintain proper gun to target distance.

Tip: The general rule of thumb is 1 inch for every 10 NV of power supply output. This rule is for a minimum safe working distance. The maximum distance should be no greater than 12 to 14 inches -

7) Keep the voltage on.

Tip: Higher tip voltage produces greater transfer efficiency. The KV output should always be set the maximum allowable. Typically 90 KV is sufficient. The only time the voltage should be turned off or down is when penetration into a recessed area is desired.

8) Trigger on the part.

Tip: Excessive lead and or lag wastes paint. Be certain you do not paint the air. Spray applicator trigger on and off points should be set at the minimum required to adequately coat the part.