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A theoretical model predicting the electric field distribution during air atomized electrostatic spray painting has been developed. A space charge pattern in the form of a rectangular pyramid is considered. The model was also applied to the case of two adjacent and inward tilted spray nozzles. The attainment of high intensity and broad range electric field at the vicinity of the substrate in conjunction with less possibility of opposite charge formation resulting from splashing shows that this configuration can offer significant deposition efficiency advantages for high-voltage charged organic paints or inductively charged water-based paints.
Date of Publication: Jan. 1986