Abstract:
An electrostatic spraying installation for conductive liquid coating product comprises a circuit for distributing fluids including the conductive coating product. At least one coating product sprayer is fed by this circuit and is connected to a variable or interruptible high voltage supply. At least one insulated auxiliary coating product storage tank is adapted to be raised to the high voltage. The installation includes at least one rinsing product supply and at least one compressed air supply. The circuit comprises at least one mobile member isolator connected between two parts of the distribution circuit to isolate the upstream circuit part from the high voltage. The installation comprises an arrangement of valves on the upstream and downstream sides of the isolator connected to the rinsing product supply and to the compressed air supply for cleaning and purging the isolator before it is opened each time.
Abstract:
An apparatus is provided for transferring electrically conductive coating materials, such as water-based paint, from a source to at least one coating dispenser such as a spray gun for discharge onto a substrate. In alternative embodiments, the coating material is supplied to the dispenser(s) from parallel flow paths which are comparatively simple and inexpensive in construction, and which are capable of delivering high pressure, high volume flows of coating material while substantially eliminating pressure fluctuations in the coating material supply when switching from one flow path to another.
Abstract:
An efficient electrostatic spray installation that can spray a wide range of conductive materials effectively while creating very small droplets with conductivities in from about 7000 pico Siemens and greater. A compact system in which one, two or more parallel sprays can be obtained at close proximity in the order of 30 to 40 mm of each other in a compact package.
Abstract:
An apparatus is provided for transferring electrically conductive coating materials, such as water-based paint, from at least one source to one or more coating dispensers for discharge onto a substrate. One voltage block is provided to avoid the creation of an electrical path between one or more sources of coating material and the coating material which is electrostatically charged during a coating operation, and a secondary voltage block is provided between each of a number of individual spray guns and the charged coating material so that each spray gun can be electrically isolated from the charged coating material when not is use. The apparatus is optionally provided with a color changer, and/or a heater which is electrically isolated from the charged coating material and is effective to elevate the temperature of the coating material prior to discharge from the spray guns.
Abstract:
An apparatus for transferring electrically conductive coating materials such as water-based paint from a source to an electrostatically charged dispenser includes first and second shuttle devices and two large reservoir, piston pumps. The first shuttle device is movable between a neutral position wherein the first shuttle is electrically isolated from the filling station, and a transfer position wherein coating material is transmitted from the source to one of the piston pumps through a coupling device which connects the filling station and first shuttle. The second shuttle device is movable with respect to a discharge station between an neutral position wherein the second shuttle is spaced from the discharge station, and a transfer position wherein coating material is transmitted from the filled piston pump, through another coupling device which connects the second shuttle and discharge station and then to the second piston pump for transmission to one or more electrostatic coating dispensers. Movement of the shuttle is controlled to maintain one of the shuttles in the neutral position while the other is at the transfer position.
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.
Abstract:
A system for electrostatic application of conductive coating liquid has a grounded primary supply of conductive coating liquid, an electrostatic spray device and a system for delivering coating liquid from the primary supply to the spray device while maintaining a high voltage at the spray device electrically isolated from the primary supply. The delivery system includes one or more electrical insulation devices, each of which has a cylinder comprising an insulative conduit having a liquid inlet and a liquid outlet. The cylinders of the electrical insulation devices are connected via their inlets and outlets between the primary supply and the spray device to deliver coating liquid from the primary supply to the spray device. Each electrical insulation device has within its cylinder a piston that is movable between the inlet to and the outlet from the cylinder to move coating liquid out of the cylinder while scraping the inside wall of the cylinder free of coating liquid, so that the cylinder becomes substantially electrically insulating between its inlet and outlet.
Abstract:
An apparatus is provided for transferring electrically conductive coating materials, such as water-based paint, from at least one source to one or more coating dispensers for discharge onto a substrate. One voltage block is provided to avoid the creation of an electrical path between one or more sources of coating material and the coating material which is electrostatically charged during a coating operation, and a secondary voltage block is provided between each of a number of individual spray guns and the charged coating material so that each spray gun can be electrically isolated from the charged coating material when not in use. The apparatus is optionally provided with a color changer, and/or a heater which is electrically isolated from the charged coating material and is effective to elevate the temperature of the coating material prior to discharge from the spray guns.
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.