Powder coating apparatus and method for electrostatically coating an electrically grounded object

摘要

In a powder coating apparatus a pulse signal S 2 of a low voltage generated by a pulse signal generation circuit ( 7 ) is boosted to a high voltage by means of a high voltage impression circuit ( 8 ), so that it is impressed upon corona electrodes ( 5 ). As a result, a corona discharge is intermittently generated from the corona electrodes ( 5 ) toward an object to be coated, whereby powder coating material sprayed from a nozzle opening of a gun main body in a forward direction is charged with negative ions developed by the corona discharge, whereafter it is directed toward the object to be coated, and is deposited on a surface of the object.