Nozzle for electrostatic spray gun
AssigneeAtlas Copco Aktiebolag
InventorsAlf Georg Bertilsson, Sten Gunnar Hugo Svensson
Life of this patent
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Abstract
An electrostatic spray gun for liquid paint has its nozzle formed in a sintered material that consists of an electrically non-conductive matrix, e.g. polytetrafluoroethylene, with conductive particles, e.g. bronze powder, dispersed in the matrix. The rear end of the nozzle is connected to high voltage, and the annular front surface around the paint discharge orifice in the nozzle is machined so that it shows a lot of such bronze particles that form point electrodes for producing air ions. The paint is dispersed by air jets and the air ions attach to the paint particles.
Claims20
Electrostatic spray gun comprising a paint nozzle with a paint discharge orifice, means to convey paint to the paint nozzle, and means coupling high voltage to the paint nozzle, said nozzle comprising a body consisting essentially of a non-conductive matrix and a large number of electrically conductive particles dispersed therein, said body having an annular surface around the paint discharge orifice which includes a plurality of exposed particle surfaces forming a plurality of electrodes for producing air ions, a plurality of said exposed particle surfaces comprising a substantial portion of the maximum cross-section of the respective particle, the exposed particle surfaces being substantially coplanar with the immediately adjacent surface of said non-conductive matrix.
A nozzle for use in an electrostatic spray gun comprising a body consisting of a non-conductive matrix and a large number of electrically conductive particles dispersed therein, said nozzle having an annular surface around the paint discharge orifice which includes a plurality of exposed particle surfaces forming a plurality of electrodes for producing air ions, a plurality of said exposed particle surfaces comprising a substantial portion of the maximum cross-section of the respective particle, the exposed particle surfaces being substantially coplanar with the immediately adjacent surface of said non-conductive matrix.
Dependencies are inferred from the claim text.