Powder Coating Application: Tribomatic Static Charging Electrostatic Spray

Tribomatic static charging is the second most common method of spraying powder coatings, after corona charging. The powder develops a charge while passing through special hoses and guns. As powder contacts these non-conductive surfaces, friction causes the particles to lose electrons. These particles then develop a powerful positive charge. No high voltage or lines of force are used which allows for easier penetration of deep recesses. Tribomatic charging is efficient in developing a static charge within the powder, however, coatings must be specifically formulated for this system.

Advantages:

• No high voltage sources
• 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
• Requires more guns
• Wears out parts faster

For more information about Tribomatic static charging, read TCI’s Troubleshooting Guide.