Why is it said that liquid air automatic electrostatic spray gun is more suitable than rotary cups for spraying profiles with more edges?

Rotary bell spraying on profiles with many edges is easily affected by the 'Faraday cage effect,' whereas liquid air automatic electrostatic spray guns are more flexible and can better cover corner areas. This is mainly due to differences in their atomization methods and electric field distribution.

Limitations of Cup Atomizing Spray

The cup atomizer generates centrifugal force by high-speed rotation (speed to 30,000–50,000 RPM) to atomize the coating and relies on electrostatic attraction for film formation. Although it produces fine atomization and a high transfer efficiency (up to over 80%), it is less adaptable to complex geometries. When spraying profiles with deep recesses, ridges, or sharp angles, the electric field concentrates on protruding areas, making the field weak in recessed areas and causing the coating to adhere poorly, which is known as the 'faraday cage effect.' Even with robot path optimization, it is difficult to completely avoid dead spots.

Advantages of Liquid Air Automatic Electrostatic Spray Gun

This technology uses compressed air to atomize the coating while charging the paint mist, which then flies toward the grounded workpiece under electrostatic attraction. Its nozzle is compact and flexible, with adjustable air pressure, spray width, and angle, making it more suitable for close-up corner and edge fine spraying. For multi-edged profiles, operators or robots can apply touch-ups from multiple angles to achieve uniform coverage, showing particular advantages in repair work and small batch production.

Comprehensive Comparison and Applicable Scenarios

Rotary Cup Spraying: Suitable for large areas and continuous work on flat or curved surfaces, such as car bodies and household appliance shells, aiming for high efficiency and a mirror-like finish.

Liquid Air Automatic Electrostatic Spray Gun: More suitable for complex structures and profiles with dense corners, such as aluminum profiles and metal frames, excelling due to its flexibility and good edge coverage.