Abstract:
A dispensing apparatus is provided for a pulverulent material entrained in a stream of a transporting gas or mixture of gases. The apparatus includes a first member and a second member. The first member includes an interior into which the stream flows and a perimetral discharge edge. The second member includes a side facing the interior and a perimetral discharge edge. A discharge opening is defined between the discharge edges of the first and second members. A dimension of the discharge opening is determined by one or more third members. Each third member has a first end adjacent the first member and a second end adjacent the second member. The third members have non-uniform transverse sections. A transverse section of each third member between its first and second ends has a smaller area than the transverse section of each third member at one its first and second ends.
Abstract:
A method and equipment for applying a liquid product onto a household article or plant for purpose of cleaning, wetting, coating, polishing, fabric treatment, plant watering and the like, the method comprising discharging the liquid through a spray nozzle in the form of an upwardly or downwardly directed spray of droplets having an average droplet size of at least about 40 nullm and preferably in the range from about 75 to about 500 nullm and at a proximal distance of from about 0.1 to about 1 m from the household article or plant, the liquid being discharged through the spray nozzle at an exit velocity in the range from about 3 to about 80 m/s, preferably from about 3 to about 20 m/s (when the spray droplets are upwardly directed) and from about 0 to about 2 m/s (when the spray droplets are downwardly directed) and at an applied potential in the range from about 0.2 to about 50 kV, whereby the overspray is less than about 40%. The equipment preferably comprises a nozzle having a multi-jet spray head, means for adjusting the orientation of the nozzle and grounding means for charge dissipation. The method and equipment provide effective coverage of household objects/plants and avoid spoil and waste of the liquid in the surroundings of the household object/plant.
Abstract:
The invention can be used in a micropump for dispensing a pharmaceutical liquid, in an ink jet printer or similar devices, or in other applications for controlled pumping of a liquid through an opening in a barrier wall. A pair of electrodes is in electrical contact with a fluid confined behind a containing wall. Each electrode is connected to a source of different electrical potential. When current is conducted through the fluid between the electrodes, resistance heating in the fluid causes local boiling and thus the formation and expansion of a bubble within the fluid. The electrodes are disposed on either side of an opening in the wall, so that the bubble is formed on one side of the wall in close proximity to the opening. Fluid behavior is such that a fluid jet is formed when the bubble collapses in close proximity to the wall. This jet impacts the bubble in a direction toward the wall. The jet then penetrates the bubble to impact against the wall and to urge a quantity of the fluid through the wall opening.
Abstract:
An electrostatic method for increasing the transfer efficiency of spray finishing using lower voltages than are normally required and used with electrostatic spraying. The positioning and construction of ground electrodes (16) behind the air cap (18) helps ensure a clean operation.
Abstract:
A process for purifying a dense dielectric fluid containing a contaminant comprising applying a plasma to a dense dielectric fluid containing a contaminant at a pressure, temperature, and for a time sufficient to oxidize the contaminant.
Abstract:
An ink for a display panel that at a time of application is a mixture of a powder material, a water-soluble resin included in a range of 1 wt % to 20 wt % inclusive of the ink, and a water-miscible solvent. The ink is water-soluble, and in comparison to conventional organic inks, the ink of the present invention exhibits a markedly reduced susceptibility to the occurrence of electrostatic action. Thus, even when the ink is discharged through a plurality of fine nozzle holes, for example, it is possible for the application process to be conducted with great efficiency, since the individual ink flows discharged from the nozzle holes flow in a vertically downward direction without reacting with each other and becoming warped as a result. The ink of the present invention may, for example, be a phosphor ink, an Ag electrode ink, a shading film (black matrix) ink, a sealant glass ink, or a white reflective layer ink, and the ink may be used in forming structural layers of a display panel.
Abstract:
A plurality of unconventional negative tribo-charging materials are described for use as the powder contact surfaces in tribocharging and corona powder spray guns, gun components, and powder delivery system components. The invention also provides a short barrel tribo-charging powder spray gun having an interchangeable powder contact insert and nozzle, with turbulence inducing air jets. The invention further provides novel tribocharging and corona gun designs. Improved powder coating systems are made possible wherein, for example, negative tribo guns can be utilized with negative corona guns to coat different parts of the same workpiece in a powder coating system. Also provided is an inside-out configuration in which pressurized air directs powder coating material outward towards a charging surface. Additional configurations provide air jet induced tribocharging and conventional tribocharging portions combined in a single gun.
Abstract:
A modular spray gun that can be configured and built to operate using a selectable spray process. The modular spray gun includes a gun body, an extension and a selectable spray atomizing component. The basic gun body and extension are used to configure a spray gun that can operate as an air spray gun, an airless spray gun, an AAA gun or an HVLP spray gun. The modular extension can be selected to allow circulating or non-circulating operation. The modular extension also permits a variety of spray nozzle assemblies to be mounted thereon depending on the selected spray process to be used with the specific gun. The modular gun body allows selective connection of an atomizing air supply and additional components specific to a particular spray process. An indicator device and/or a relief valve is provided for spray guns using an HVLP spray process to provide an indication that the spray gun is in compliance with the maximum nozzle air pressure limit, usually less than 10 psi. A new air valve seal assembly is also provided. The modular gun design can accommodate electrostatic and non-electrostatic versions.
Abstract:
The invention provides a gun for spraying a powder onto a work piece to form a coating and includes a pistol-grip housing having an air valve coupled to a source of pressurized air. The housing also supports a source of variable electrical potential. A powder container is disposed in fluid communication with the air valve so that powder within the container may be fluidized by air from the source of pressurized air when the valve is opened. A nozzle is positioned within the housing and includes a central passageway having an open end and disposed in fluid communication with the powder container. The central passageway frictionally imparts a net electrical charge of a first polarity to a first portion of the powder when the first portion of the powder contacts the surface during the spraying. A discrete member is positioned within the central passageway and is capable of imparting a net electrical charge of a second polarity to a second portion of the powder when the second portion of the powder contacts the tubes during the spraying. An emitter rod is positioned within the central passageway and comprises a proximal end and a distal end, where the proximal end is interconnected to the source of variable electrical potential.
Abstract:
In an electrostatic sprayer, a pulsating voltage developed using a battery or a generator as a power supply is stepped up using a step-up transformer. A resultant high-voltage pulse is rectified and applied to an electrostatic electrode. A spray jetted from a spray nozzle is thus electrified. Herein, the step-up transformer is located near the spray nozzle. Owing to this structure, a high voltage produced by the step-up transformer can be applied to the electrostatic electrode with a loss minimized.