An electrostatic spray drying system includes an electrostatic spray nozzle having a spray tip assembly arranged to discharge a supply of fluid into a drying chamber. The electrostatic spray nozzle is responsive to a duty cycle signal that determines periods at which the electrostatic spray nozzle is open to inject the fluid. A controller is programmed to activate a pulse width modulation (PWM) mode of operation for the electrostatic spray assembly, initiate a first timer, provide a first duty cycle signal to the electrostatic spray nozzle at a first PWM activation frequency while the first timer has not reached a first pulse duration, initiate a second timer when the first timer has reached the first pulse duration, and provide a second duty cycle signal to the electrostatic spray nozzle at a second PWM activation frequency while the second timer has not reached a second pulse duration.

A system for fluid transport is provided where a quantity of fluid is held in a reservoir. A droplet generator is employed to generate droplets from the fluid, for example a nozzle-based system or a nozzleless system such as an acoustic ejection system. A generated droplet has a trajectory whereby it arrives at a target. A circuit is used to modify one or more characteristics of the generated droplet in a way which increases the likelihood that the droplet will not splash or bounce when it arrives at the target. The circuit may in different embodiments control the speed of the droplet or the Weber number of the droplet. The circuit may create an electric field in an area of space where the droplet passes. The circuit may charge the droplet by causing it to contact ions.

A spray apparatus for spraying a cosmetic liquid by way of electrostatic forces. The spray apparatus includes a fluid supply, at least one feed device, and at least one nozzle comprising a nozzle body, a connection flange, a nozzle channel, a spray opening, and an electrode. The fluid supply is connected to the feed device, the feed device is connected to the nozzle, and the electrode is arranged in the nozzle channel. The electrode is arranged in the nozzle channel such that it has a distance to the spray opening measured along a longitudinal axis of the nozzle channel of at most 2.1 mm and at least 0.0 mm.

An electrostatic oiling system for use with single blanks in batch systems having an open spray chamber without the need for a negative vacuum chamber. Further, the provided electrostatic oiling system may utilize induction beams and a charge wall that allows for utilization of a smaller vacuum system. Further, the provided electrostatic oiling system may provide variable blank coverage without the need for metered pumps.

An apparatus provides precise steering of inkjet droplets to a substrate by use of multipole arrangement with electrodes on a resistive plate. There may be droplet detection based on charge sensing. A hexagonal spiral deposition pattern on a target substrate allows fast uniform printing covering a nearly circular hexagonal area. There may be six electrodes arranged to form a cubic enclosure, and injected droplets may be merged within the enclosure, and their charge controlled by merging of source droplets of differing charges to provide a net charge for biasing onward steering.

An electrostatic spray dryer for drying liquid into powder including an elongated body defining a drying chamber, a spray nozzle assembly at one end of the drying chamber and a filter element housing and powder collection chamber at an opposite end. A non-structural non-metallic liner is disposed within the elongated body in spaced relation to an inner wall surface for defining an internal drying zone. The liner is releasably supported within the body for enabling selective removal and replacement following a particular usage. The illustrated elongated body has a modular construction comprising a plurality of modules, with at least one being selectively removable and replacement for altering the length of the drying chamber for a particular spray application. The liner also is replaceable with a liner of a length corresponding to the altered length of the drying chamber or with a different diameter for a particular usage.

A spray dryer for drying liquid into powder including an elongated drying chamber, a spray nozzle assembly at an upper end of the drying chamber and a filter element housing and powder collection chamber at a lower end of the drying chamber. The filter element housing comprises a plurality of cylindrical filter elements supported from a wall of an exhaust chamber that communicates with an exhaust gas outlet of the filter element housing. In one embodiment, the filter element housing includes an inner downwardly opening cylindrical shroud surrounding the filter elements which defines an outer annular powder and drying gas passageway communicating with the powder collection chamber, and the exhaust chamber is defined by a downwardly opening conical plenum having an outer conical surface for directing drying gas and powder about the shroud into the powder collection chamber. Filter elements each have a respective reverse gas pulse cleaning device.

A voltage application device according to the present disclosure includes a voltage application circuit and a control circuit. The control circuit causes the voltage application circuit to alternately repeat a first mode and a second mode. The first mode is a mode that raises a voltage while time elapses, and generates a discharge current by promoting corona discharge to dielectric breakdown. The second mode is a mode that lowers the voltage to cut off the discharge current by causing a load to be in an overload state against the voltage application circuit. This can suppress an amount of ozone generated, while increasing an amount of radicals produced.

A spray drying system for drying liquid into powder including a plurality of processing towers each including an elongated drying chamber, a spray nozzle assembly at an upper end of the drying chamber and a powder collection chamber at a lower end of the drying chamber. The powder collection chamber of each processing tower being configured to discharge power to a common conveyor system.

A liquid spraying device including a tank configured to store liquid, a spraying device including a discharger configured to discharge the liquid in a form of a mist, a first flow path forming part disposed between the tank and the discharger and forms a first flow path of the liquid, a pump provided midway of the first flow path, and feeds the liquid from the tank toward the discharger, and a second flow path forming part configured to form a second flow path that branches off from the first flow path at a branching position between the pump and the discharger, and returns to tank. The first flow path forming part includes a small sectional-area part between the branching position of the first flow path and the discharger, the small sectional-area part forming a flow path having a sectional area smaller than a sectional area of the second flow path.