Process and apparatus for the electrostatic spraying of electrically conductive paint
AssigneeAkzo N.V.
InventorsAlbertus C. Spanjersberg, Hans G. Mink, Johannes H. M. Barwegen
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Abstract
The invention relates to a process and apparatus for the electrostatic spraying of electrically conductive paint. Paint free of electric charge is intermittently fed from a main supply system to a buffer supply vessel, from which the paint is intermittently fed to a spray paint supply vessel which contains electrically charged paint. The paint in the buffer supply vessel is already electrically charged prior to the replenishing of the spray paint supply vessel from the buffer supply vessel. The paint in the buffer supply vessel is intermittently electrically charged and discharged.
Claims31
In a process for the electrostatic spraying of an electrically conductive liquid coating material wherein the liquid to be sprayed is intermittently fed while free of electric charge from a main supply system to a buffer supply vessel and intermittently fed from the buffer supply vessel to a second vessel which contains a supply of liquid to be sprayed and is continuously electrically charged during operation, the latter vessel being connected to at least one spray unit for spraying the liquid, the main supply system being electrically insulated from the spray liquid supply vessel, the improvement which comprises charging the liquid material in the buffer supply vessel before the liquid in the buffer supply vessel or the parts conductively connected thereto are at a spark-over or charge-bridging distance from the electrically charged liquid in the spray liquid supply vessel or the parts conductively connected thereto.
Dependencies are inferred from the claim text.