Electrostatic Spray Tribo Charging the second most common method

Electrostatic Spray Tribo Charging is the second most common method of spraying a powder coating powder. This method relies on the powder to develop a charge while passing through special hoses and guns. As powder contacts these non-conductive surfaces,electrons are stripped off of the particles due to friction. These particles then develop a powerful positive charge. No high voltage or lines of force are used which allows for easier penetration into deep recesses. Tribo charging is efficient in developing a static charge within the powder,however,coatings must be specifically formulated for this system.

Advantages:

• No high voltage required;
• Better penetration into recessed areas;
• Slightly lower capital costs

Disadvantages:

• level of charge varies with powder chemistry and formula
• Slower rate of application;
• Transfer efficiency is lower than corona charging system;
• Required more guns;
• Wears out parts faster.