Abstract:
Conductive paints are electrostatically sprayed by electrically isolating the electrostatic charge imposed on the atomizing head from the paint supply tank to prevent dissipation of the charge through the conductive paint which is supplied.
Abstract:
A removal of static electricity from a conductive coating can be used in an electrostatic coating system. A conductive liquid is atomized or formed into droplets and supplied to an electric insulating vessel. A supply port is thereby insulated from a stored liquid surface by making use of electric insulation characteristics of air. The liquid is atomized and ionized while applying a high voltage to the liquid storage system, and sprayed onto a charged article to discharge it.
Abstract:
A device for insulating the spray liquid source from the high tension voltage of an electrostatic spray system when using an electrically conductive spray liquid. The device comprises a spray gun (13), a supply line (12) which connects the spray gun (13) to a spray liquid reservoir (10) and which includes a vessel (16) containing a barrier forming liquid (17) of low electrical conductivity and a density other than that of the spray liquid. The vessel (16), which is substantially non-conductive is connected at its inlet end (24) to ground potential and at its outlet end (19) to the same high potential as the spray gun (13). An electrode means (22; 25) is provided in the vessel (16) to expose the spray liquid passing through the vessel (16) to at least one intermediate potential for controlling the tension gradient in the barrier forming liquid by limiting and controlling the charging of the spray liquid.
Abstract:
A method and apparatus for paint insulation in electrostatic coating, wherein an insulating hollow member is grounded at its outer peripheral wall to prevent the rise in the potential at its inner wall. Consequently, drops of conductive paint such as water-base paint can be easily and continuously insulated when they fall from the upper part of the insulating hollow member.