Electrostatic Spraying with Ionized Field Charging of Twin-Fluid Nozzle and Direct Charging of Spinning Disk Nozzle (II)

Deposit Characteristics on the Lattice Target

Abstract

A twin-fluid nozzle using the ionized field charging method (React Gun) and a spinning disk nozzle using the direct charging method (Mini Bell) were tested to spray to the target constructed with five layers of lattice.
Spray patterns of the twin-fluid nozzle were very narrow and its spray droplets had large penetration characteristic so that they reached to the fifth lattice of the target regardless of charged voltage.
When a needle electrode was maintained at a high voltage, many spray droplets deposited on back surface of the target.
Since there was little change of deposit efficiency at over-26kV voltage, the twin-fluid nozzle would be desired to use under relatively low voltage.
Deposit area of the disk nozzle was wide and deposit density on back surface of the target was very high, however, spray penetration was such little as the droplets scarecely reached until the third lattice with high shaping air flow rate of 245l/min.