INFLUENCE OF POWDER PROPERTIES ON THE PERFORMANCE OF ELECTROSTATIC COATING PROCESS

Properties of powder, e.g. particle size distribution, chemical compos ition, tribo- and corona charging characteristics, electrical resistiv ity, hygroscopicity, fluidity and shape distribution play significant roles on the performance of powder coating such as transfer efficiency , film thickness, adhesion and appearance. Our focus in this paper is on particle size distribution, fluidity, charging characteristics and their effects on the first pass transfer efficiency. Even a minor diff erence in powder properties showed differences in the applications pro cess illustrating the importance of characterizing physical parameters and control techniques to achieve desirable performance.