POWDER CHARGER AND ELECTROSTATIC POWDER DEPOSITION DEVICE

摘要

PURPOSE:To perform electrostatic powder painting with high efficiency by intermittently impressing a DC voltage to a plasma generating electrode and supplying powder dispersed in a space where required polarity ions exist. CONSTITUTION:A required polarity plasma electrode 3 is a needle electrode having a small radius of curvature at the top end and is used as a low voltage side plasma electrode. A reverse polarity plasma electrode 4 is a needle electrode having a large radius of curvature at the top end and is used as a high- voltage side plasma electrode. Corona discharges of both polarities are intermittently generated and the plasma is formed when the high-voltage is intermittently impressed between the two electrodes 3 and 4 by a DC power source. The required polarity ion current 6 of the electrode 3 is extremely larger than the current 7 of the electrode 4 and if a dispersing gas 11a is ejected thereto from an ejection port 11, the powder is thoroughly agitated and dispersed and is charged in the space 13 where the required polarity ions exist. The electrostatic powder painting is thus executed with excellent deposition efficiency.