Fluid sprinkling – spraying – and diffusing – Processes – Including electrostatic charging
Patent
1979-09-17
1981-05-12
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Processes
Including electrostatic charging
239707, B05B 502
Patent
active
042667216
ABSTRACT:
Disclosed is a spray gun having a gas nozzle and a fluid nozzle, each of the nozzles being in cooperative spatial relationship with the other to cause a fluid stream issuing from the fluid nozzle to be atomized and sprayed as fluid particles by gas issuing from the gas nozzle. In a preferred embodiment the fluid nozzle orifice has therein an axially disposed rod to increase surface area from which the fluid particles can be found, the rod being a corona discharge electrode of a first polarity. The spray gun additionally has an induction charging electrode of a second polarity opposite the first polarity and disposed adjacent the gas and fluid nozzles, the induction charging electrode defining a charging zone wherein an electrostatic charge is imparted to atomized electrically-chargeable fluid particles. Relatedly disclosed is a method of applying a liquid coating composition having an electrical conductivity of less than about 0.06 .mu.mho/cm to a workpiece through utilization of both corona and induction charging in a spray gun.
REFERENCES:
patent: 2302185 (1942-11-01), Campbell, Jr.
patent: 4009829 (1977-03-01), Sickles
patent: 4106697 (1978-08-01), Sickles et al.
Kashnikow Andres
Morris George D.
PPG Industries Inc.
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