Static electricity occurs whenever electrically insulated materials move, rub against or separate from one another. This occurs particularly in dry conditions when charges which have accumulated cannot find a conducting path to earth. The clean and dry conditions within a spray booth create the perfect environment for static to generate in large amounts.
All materials contain positive and negative charges; these are in the form of positive ions, negative ions and neutral molecules. When two surfaces are brought together (for example during the tacking process), surface electrons are shared, leaving behind “patches” of positive and negative static charge. In order for the surface to once again become neutral, positive and negative ions need to be introduced to the charged area. Positive neutralises negative and vice versa.
This is achieved by introducing the Stat-Gun as the final stage of the preparation process just prior to spraying. The Stat-Gun uses a microprocessor to generate high voltage transferred through tungsten emitters, which in turn generate positive and negative ions. Air flow is an important part of the process allowing the ions generated to travel quickly and distribute evenly over the charged area. Air movement also aids removal of contaminates previously bonded by static charge.