The dry coating powder is filled into a powder hopper (1), fluidized (2) and conveyed by means of compressed air to the spray gun (3). One or more electrodes (4) on the front of the powder gun charges the powder to high voltages (tens to hundreds of kV) when sprayed (5 – system controller). An electric field is created between the powder gun and the grounded work-piece. The powder particles follow these electric field lines and remain adhered to the object due to its the residual charge; the curing step induces particles melting to create a continous coating layer.
Gema EPC commercial system.