Characterization of tribocharging properties of powder paint

Simultaneous measurements of particle size and electrostatic charge was performed on charged powder paint and other powders in the particle size range from 1.0 to 65.0 μm in diameter. An electrical single-particle aerodynamic relaxation time analyzer was used to measure electrostatic charge and aerodynamic size distributions on a single particle basis and in a noninvasive manner. The powders were triboelectrically charged against nonconducting surfaces. The average charge attained by particles larger than 4.0 μm in diameter was less than the Gaussian limit of saturation charge. The charge-to-mass ratio of the bulk powder sample depended on the range of particle size in the sample. The mass median aerodynamic diameter of the sample studied was 30.0 μm with a geometric standard deviation of 2.0