Abstract: A dust collection device for a sanding tool comprising a bag having a sidewall and a coupler attached to the bag. The sidewall comprising a first filter layer, a second filter layer, and an outer support layer. The first filter layer comprising a plurality of fibrillated electrostatically charged electret fibers forming a nonwoven web; the first filter layer having a total pressure drop between about 0.1 to about 4.0 mm H2O, and the first filter layer having a total basis weight between about 50 to about 450 gram/m2. The second filter layer comprising a melt blown microfiber nonwoven web; the second filter layer having a total pressure drop between about between about 5.5 to about 20.0 mm H2O, and the second filter layer having a total basis weight between about 15 to about 75 grams/m2.

Abstract: Improvements in active field polarized media air cleaner include an aerodynamic front cowling to reduce static air resistance, a rear double hinge to reduce blow by, a resistive center screen permitting the sharing of high voltage power supplies while reducing the tendency to arc and allowing for a higher operational voltage, a dielectric media support frame to produce a more uniform electrostatic field and reduce blow by, while at the same time reducing the tendency to spray corona and/or arc at the edges of the center screen, a substantially flat conductive outer screen to produce a more uniform electrostatic field throughout the filter media and a high-voltage shield to reduce high-voltage arcing and the spraying of corona where the high-voltage probe contacts the center screen.

Abstract: A filter element having multiple formed layers of filtration media is disclosed. The media are layered so as to form a pore size gradient. The filter element is capable of removing both solid and liquid particulates from a moving fluid stream. The filter element has high strength and compressibility. The layers can be supported on a porous or perforate support to provide mechanical stability during filtering operations. The filtration media layers can be formed into various filter element forms such as panels, cartridges, inserts, and the like.

Abstract: An assembly of structural components for supporting an air filtration member is disclosed. The assembly may include an air filtration member and a framework designed to provide support to the filtration member. The framework may include a first structural component forming a lower base of the framework for supporting the filtration member and a second structural component forming an upper base of the framework for supporting the filtration member. The framework may also have an arm that is slidable within and attachable to the framework, and may be configured to provide an adjustment mechanism for the framework, such that the framework and the filtration member can be located within a number of differently sized forced air heating or air conditioning ducts.

Abstract: Filter media are provided having improved conductivity to enhance filtration efficiency and/or dissipate static charge, and methods for making the same. In one exemplary embodiment, the filter media can include a filtration substrate, and at least one conductive coating disposed on at least a portion of the filtration substrate. In use, the conductive coating is coupled to an energy source and it is effective to emit ions when energy is delivered thereto to increase the efficiency of the filtration substrate and/or to dissipate or eliminate static charge generated during filtration.

Abstract: A filtration media that incorporates a static dissipative media layer for dissipating the static charge that builds up as a fluid, such a fuel, passes through the filtration media. The filtration media includes a filter media suitable for filtering fluid, and a static dissipative media layer. The static dissipative media layer has a surface resistivity level that is sufficient to classify the media layer as static dissipative rather than conductive.

Abstract: A device for reducing the number of particles in the exhaust gas of an internal combustion engine includes at least two structures through which an exhaust gas can flow, initially through a first structure and then through a second structure during operation. An electrical potential difference can be generated between the structures. In this way, the exhaust gas downstream of the second structure has fewer particles, averaged over time, than the exhaust gas upstream of the first structure. In addition, the particles downstream of the second structure have a larger mean diameter than those upstream of the first structure, so that it is possible to reduce emissions, in particular of fine dust, in the exhaust gas of internal combustion engines. A method for reducing the number of particles in the exhaust gas of an internal combustion engine, is also provided.

Abstract: A cleanable filter for particulate material, includes a zigzag pleated filter pack, spacers disposed between the pleats in the filter pack and a frame having an upper and lower part covering the respective upper and lower side of the filter pack that contains the ends of the fold lines and two lateral parts covering the opposite sides of the filter pack that contains the ends of the filter medium zigzag folded into a filter pack, the frame thereby leaving the opposite sides of the filter pack that contains alternate fold lines of the pleated filter pack, free for the passage of air. The filter medium in the filter pack includes a pleated sheet of polytetrafluorethylene and the spacers between the pleats consist of corrugated aluminum foils. An earthing element furthermore electrically connects the aluminum foils to each other and to an earth connection on the outside of the filter frame.

Abstract: An air filter, an elevator having the same, and an air conditioning control method thereof purify the air inside the elevator to make the air safe and pleasant using a micro plasma ion generator (MPI). The elevator includes a cage which moves up and down in a vertical direction of a building and an air filter which purifies the air inside the cage. The air filter includes an ion generator which generates ions by a plasma discharge to discharge the ions into the cage, a dust sensor which detects a dust contamination level in the cage, and a controller which compares the dust contamination level detected by the dust sensor with a predetermined standard contamination level and operates the ion generator If the dust contamination level is equal to or greater than the predetermined standard contamination level.

Abstract: A wet electrostatic precipitator is disclosed to include a condensation-growth chamber, a precipitation chamber connecting with the condensation-growth chamber, three dual-sleeve members mounted in the precipitation chamber, three discharge electrodes connecting with the dual-sleeve members, two insulating members covering on the inner surface of the precipitation chamber, and two ground electrodes mounted on the outside of the precipitation chamber. Thus, a uniform water film is formed on the surface of the insulating members to wash away the particles from waste gas. The condensation-growth chamber is provided for the particles to grow therein and thereby enhances the collection efficiency. The insulating member acts as a shield between the discharge electrodes and the ground electrodes and thereby avoids a short circuit or sparks.

Abstract: A method for making a metal fluoride trap including: assembling a precipitation tube assembly including a plurality of precipitation tubes supported between a first tube end support and a second tube end support; assembling a precipitation tube, flowsheet and filter media assembly including: wrapping a flowsheet around at least one full circumference of the plurality of precipitation tubes, wherein the flowsheet has a width less than a length of the plurality of precipitation tubes between the first tube end support and the second tube end support; and wrapping a filter media around the wrapped flowsheet, wherein the filter media and the flowsheet are wrapped so as to have a diameter less than an inner diameter of an outer casing of the metal fluoride trap; inserting the precipitation tube, flowsheet and filter media assembly into the outer casing of the metal fluoride trap; allowing the flowsheet to expand; and pressing the filter media between the flowsheet and an inner surface of the outer casing of the me

Abstract: A dual-filter electrically enhanced air-filtration apparatus and method are described. One embodiment includes an upstream electrically enhanced filter; a downstream electrically enhanced filter; a first control electrode adjacent to an upstream side of the upstream electrically enhanced filter; a second control electrode adjacent to a downstream side of the downstream electrically enhanced filter; and an ionizing electrode disposed between the upstream and downstream electrically enhanced filters, the ionizing electrode having an electrical potential with respect to the first and second control electrodes. Optional field electrodes may be included to enhance the electric fields associated with the upstream and downstream electrically enhanced filters.

Abstract: A particulate matter detection device (100) includes a first electrode (10) that includes a conductive section (12) and a dielectric (14) that covers the conductive section (12), and a second electrode (20) that is disposed opposite to the first electrode (10) at an interval of 0.3 to 3.0 mm. Charged particulate matter contained in a fluid that passes through the space between the first electrode (10) and the second electrode (20), or particulate matter that is contained in a fluid and charged by a discharge that occurs due to application of a voltage between the electrodes (10) and (20) is electrically adsorbed on at least one of the electrodes (10) and (20), and the particulate matter adsorbed on the electrodes (10) and (20) is detected by measuring a change in electrical properties of the first electrode (10), or a change in electrical properties of the electrodes (10) and (20).

Abstract: An apparatus for separating exhaust particulates from an exhaust gas stream, includes a ceramic honeycomb body with ducts through which exhaust gas can flow and which extend in the longitudinal direction of the honeycomb body, with the honeycomb body being provided with electrodes for generating an electric field which are each oriented transversally to the axis of the ducts. The electrodes are each formed by a group of ducts in which an electric conductor is introduced at least partly along their axial extension. It preferably includes a metallic coating.

Abstract: Methods and apparatus for hydrodischarging and hydrocharging substrates and articles to produce enhanced ability to avoid attraction of contaminants or improved capability of removing contaminants from fluids are disclosed. In another form the method involves removal of electric charges or neutralization of charge on or within substrates. Also disclosed are methods of making using electret substrates and articles for removing particulates and mists from fluid streams.

Abstract: Gas treatment equipment including a corona electrode and a dust-collection electrode facing the corona electrode, and forming corona discharge in gas passing between the corona electrode and the dust-collection electrode by applying a high voltage between them to collect components in the gas wherein a gas turbulence accelerator is located in the vicinity of the surface of the dust-collection electrode facing the corona electrode.

Abstract: A discharge unit (30) and a heat exchanger (20) are disposed in an air passageway (15). In the discharge unit (30), a rod-like discharge electrode (31) and a plate-like counter electrode (32) are disposed perpendicular to the flow of air, and lie along the heat exchanger (20). Upon application of voltage to both the electrodes (31, 32), streamer discharge is performed between the electrodes (31, 32), whereby an active species capable of decomposition of a component to be processed is produced.

Abstract: Filter media for an active field polarized media air cleaner includes two layers of dielectric material with a higher resistance air permeable screen sandwiched between the lower resistivity electric layers. The filter media may further include a mixed fiber filter layer having fibers from different sides of the triboelectric scale. The filter media may further include a layer of relatively higher density dielectric material followed by a layer of relatively lower density dielectric material.

Abstract: A pleated filter media includes a plurality of parallel conductive beads to support the media and space the pleated surfaces apart. A high voltage differential applied between adjacent conductive beads induces an electrostatic field within the filter media, thereby increasing the efficiency of the filter.

Abstract: System for separating particles from an environment, the system including a perforated screen and an ionisation electrode in the environment for creating an electrostatic potential between the electrode and the screen to attract the particles to the screen.

Abstract: Generally, systems for air and water purification using unpowered charged sorbent mediums (3) which may include layered double hydroxide (LDH) (1) compositions, lignin (2), and methods of sorbing inorganic or organic material(s) onto such mediums, including anionic contaminants (10), cationic contaminants (11), non-ionic organic contaminants (20), and even biological agents (7) such as bacteria or viruses present in liquids or gases.

Abstract: An air conditioning system includes an air flow pathway extending through a housing from an inlet to an outlet. Air conditioning apparatus is disposed in the airflow pathway between the inlet and the outlet conditioning an air stream passing through the air flow pathway from the inlet to the outlet. A modular electrically stimulated air filter apparatus is carried by opposed, parallel frameworks mounted in series in the air flow pathway between the inlet and the air conditioning apparatus filtering entrapping contaminants in the air stream flowing through the housing from the inlet to the outlet. The opposed parallel frameworks are mounted to opposed supports affixed to the housing.

Abstract: The invention relates to an improved electrostatic filter and filter media for filtering contaminants, such as particulates and vapor phase contaminants, from a confined environment such as electronic or optical devices susceptible to contamination (e.g. computer disk drives) by providing an improved performance recirculation filter.

Abstract: An air particle precipitator and a method of air filtration include a housing unit; a first conductor in the housing unit; a second conductor in the housing unit; and a carbon nanotube grown on the second conductor. Preferably, the first conductor is positioned opposite to the second conductor. The air particle precipitator further includes an electric field source adapted to apply an electric field to the housing unit. Moreover, the carbon nanotube is adapted to ionize gas in the housing unit, wherein the ionized gas charges gas particulates located in the housing unit, and wherein the first conductor is adapted to trap the charged gas particulates. The air particle precipitator may further include a metal layer over the carbon nanotube.

Abstract: A hybrid wet electrostatic precipitator for collecting sub-micron and nano-particulate material. The collector can be made up of three concentric tubes or pipes with an internally formed gas path communicating between an inlet and an outlet. A first collector and discharging zone can be provided in the gas path to create a corona discharge to charge particles and to collect particulate. A second collector can be formed by a porous wall which can act as a filtration device. A third collector can be formed by two or more of the concentric circular tubes, one porous and one solid, with a zone of uniform electric field between them. The porous tube can be either the inner tube or the middle tube. A liquid pool can be placed between the first and third collectors to provide chemical treatment of the gas flow or simply filtration as the gas passes through. A high-tension voltage supply can be used to supply a discharge voltage capable of generating a corona discharge into the flow in the first zone.

Abstract: The present invention relates to a conducting filter (110) adapted for gas purification and a filter assembly (150, 200, 300, 400, 500, 600) comprising such filter. The conducting filter is made from a polymer which has received significantly increased electrical conductivity by a doping process. Such doped polymers are referred to as synthetic metals. Thanks to the electric properties of the synthetic metal, the filter according to the invention, comprising such polymer, can be supplied with electrical charge and thereby maintain its efficiency with regards to the electrostatic properties during operation. In the filter assembly according to the invention, the conducting filter is supplied with electrical charge by connecting it to a high voltage source.

Abstract: An air cleaner including an ionization unit and a dust collection unit is provided. A plurality of electrostatic flocked piles may be provided on the ionization unit, or on the dust collection unit, or on both the ionization unit and the dust collection unit. The electrostatic flocked piles further improve air cleaning performance by filtering out foreign materials through both physical contact and by filtering ionized foreign materials using electrostatic attraction. The air cleaner may be widely adapted for use with various types of air conditioning apparatuses, as well as in a stand alone application.

Abstract: A compact, hybrid particulate and gas collector that can be used in an ultra-clean air purification, vehicle emissions control system, gas turbine, or in any other application where space and lower cost is important or in applications where sub-micron and nano-particulate filtering is needed such as in clean rooms and surgical suites. A gas flow enters the device in a first chamber and can be immediately exposed to a high-tension corona discharge electric field which typically results in a strong ionic flow by charging and collecting the incoming effluent (oil mist, soot particles, etc.). Subsequently, the charged flow enters a second zone of high-tension uniform electric field that causes the remaining charged particles to migrate to one of the charged electrodes.

Abstract: A compact, hybrid particulate and gas collector that can be used in a vehicle emissions control system, gas turbine, or in any other application where space and lower cost is important or in applications where sub-micron and nano-particulate filtering is needed. A gas flow enters the device in a first chamber and can be immediately exposed to a high-tension corona discharge electric field which typically results in a strong ionic flow by charging and collecting the incoming effluent (oil mist, soot particles, etc.). Subsequently, the charged flow enters a second zone of high-tension uniform electric field that causes the remaining charged particles to migrate to one of the charged electrodes. One of the electrodes can be made of porous filter material that allows the cleaned gas to flow into an exit zone also containing a high-tension uniform electric field where the remaining effluent can be collected prior to the clean gas exiting either to ambient air or being re-circulated to be used again by the engine.

Abstract: Methods and apparatus for hydrodischarging and hydrocharging substrates and articles to produce enhanced ability to avoid attraction of contaminants or improved capability of removing contaminants from fluids are disclosed. In another form the method involves removal of electric charges or neutralization of charge on or within substrates. Also disclosed are methods of making using electret substrates and articles for removing particulates and mists from fluid streams.

Abstract: An apparatus (10) and method for recovering elemental carbon, elemental sulfur, elemental iron, elemental gold and other elemental materials from an air flow including a funnel-shaped receptor (14) and an inverted cone-shape electrode node body (12) spaced from the funnel receptor, a funnel-shaped reaction zone (45) between the outer surface of the electrode node body and the inner surface (60) of the receptor for receiving the air flow, and a plurality of point source electrodes (36) mounted to the electrode node body (12) and projecting into the reaction zone (45). The electrode node body (12) and the receptor (14) are electrically isolated from each other, the receptor (14) is connected to ground, and a voltage source is electrically connected to the electrode node body (12).

Abstract: An air conditioning system includes an air flow pathway extending through a housing from an inlet to an outlet. Air conditioning apparatus is disposed in the airflow pathway between the inlet and the outlet conditioning an air stream passing through the air flow pathway from the inlet to the outlet. A modular electrically stimulated air filter apparatus is carried by opposed, parallel frameworks mounted in series in the air flow pathway between the inlet and the air conditioning apparatus filtering entrapping contaminants in the air stream flowing through the housing from the inlet to the outlet. The opposed parallel frameworks are mounted to opposed supports affixed to the housing.

Abstract: A gas sampling canister has an electrospray nozzle for creating an ionic fluid electrospray plume. A gas sample is intake positioned to provide a gas sample flowing through the ionic fluid electrospray plume. A cooled counter electrode is positioned to collect the electrospray plume such that selected chemicals in the gas sample are captured by ionic fluid accumulating on the cooled counter electrode. A system and method for sampling gas are also described.

Abstract: A device separates particulates from a gas stream flowing through the device. The device includes at least one high voltage electrode and a substantially cylindrical separator. The high voltage electrode applies a first voltage to the gas stream. The separator has an inlet for introducing the gas stream into the separator tangentially to an interior wall of the separator, a particulate outlet for expelling the particulates from the separator, and a gas stream outlet.

Abstract: A surface discharge type air cleaning device including an insulating dielectric body formed in the shape of a sheet, a discharge electrode formed at the upper surface of the insulating dielectric body, and a ground electrode formed at the lower surface of the insulating dielectric body. The discharge electrode is formed of a closed pattern having a predetermined area on the upper surface of the insulating dielectric body. The discharge electrode has a non-pattern part disposed in a pattern part where the pattern is formed. The electrode is not formed at the non-pattern part. The ground electrode is formed at a predetermined position corresponding to the non-pattern part. The area of the non-pattern part is reduced to decrease generation of ozone, and the area of the pattern part is enlarged to increase generation of negative ions and hydroxyl radicals.

Abstract: In various aspects of the invention, electrostatic filters having insulated electrodes are described. In such embodiments, care is taken to prevent the accumulation of opposing charges on the insulation, which, over time, would serve to significantly degrade the strength of the electrostatic field created in the dielectric, and thus reduce the performance of the electrostatic filter. A variety of mechanisms are described for mitigating the opposing charge buildup problem.

Abstract: The invention concerns an electrostatic ionic emission device for depositing on the surface of a plurality of particles aerosols within a fluid, a quasi-homogeneous amount of ions. The device includes a discharge corona conductive electrode, and a non-corona conductive receptor electrode. The receptor electrode has an open cellular foam structure and a pseudo planar active surface that faces the discharge electrode. The active surface of the receptor electrode has a multiplicity of substantially sharpened points.

Abstract: A dust-collecting electrode where at least one unit electrode between the unit electrodes facing each other includes: a ceramic dielectric body, a surface conductor disposed so as to cover at least a part of the surface of the ceramic dielectric body on the side where the unit electrodes face each other, and an internal conductive layer disposed inside the ceramic dielectric body and being electrically independent of the surface conductor. The dust-collecting electrode being capable of generating an electric field and silent discharge between the unit electrodes by applying voltage between the surface conductor of the one unit electrode and the other unit electrode and generating creeping discharge on the surface of the one unit electrode by applying voltage via the ceramic dielectric body.

Abstract: A module for generating ions in a flowing air stream includes a support structure having a central region adapted to pass a flowing air stream therethrough, and including a plurality of supports for positioning a filamentary ion-generating electrode in a polygonal configuration within the central region. The supports and filament are relatively moveable to wipe the surface of the filament at each support for removing accumulated contaminants on the filament.

Abstract: An air particle precipitator and a method of air filtration include a housing unit; a first conductor in the housing unit; a second conductor in the housing unit; and a carbon nanotube grown on the second conductor. Preferably, the first conductor is positioned opposite to the second conductor. The air particle precipitator further includes an electric field source adapted to apply an electric field to the housing unit. Moreover, the carbon nanotube is adapted to ionize gas in the housing unit, wherein the ionized gas charges gas particulates located in the housing unit, and wherein the first conductor is adapted to trap the charged gas particulates. The air particle precipitator may further include a metal layer over the carbon nanotube.

Abstract: An apparatus useful for electrostatic deposition (ESD) of aerosol particles and methods of depositing the aerosol particles onto a substrate are disclosed. The ESD apparatus and the method of the present invention are useful for electrostatically depositing nanoparticles produced by gas-phase synthesis onto a substrate where the velocity of the flow of aerosol can be controlled.

Abstract: An electret filter media that includes a thermoplastic resin and a compound of the formula Y2-A(R1)n—Y1, where A is benzene, naphthalene or anthracene, Y1 and Y2 are each independently R2-R3, R2 is an ester linking group or an amide linking group, R3 is an alkyl group having from 10 to 22 carbon atoms, R1 is R2-R3 where R2 and R3 are each independently as defined above, and when A is benzene, n is from 0 to 4, when A is naphthalene, n is from 0 to 6, and when A is anthracene, n is from 0 to 8.

Abstract: The present invention is directed to an improved electronic enclosure filter for very small spaces, such as small disk drives. The filter includes an exposed electrostatic layer that functions to catch and retain particulate contamination within the filter. The filter can be placed within disk drive enclosures such that the electrostatic layer is in very close proximity to the rotating disk without causing excessive turbulence. The close proximity of the electrostatic layer to the disk creates relatively high levels of airflow over the electrostatic layer.

Abstract: An electrostatic precipitator is detailed. The precipitator includes a conduit for the passage of particles in an air flow and a generator of an electrostatic field substantially orthogonal to the air flow, and an ion supply, capable of charging the particles, in which the generator includes a point electrode and a two dimensional surface electrode. The plane surface electrode includes an ion source and the point electrode includes a counter electrode and the counter electrode is earthed.

Abstract: A system useful for electrostatic deposition (ESD) of aerosol particles and methods of depositing the aerosol particles onto a substrate are disclosed. The ESD system and the method of the present invention are useful for electrostatically depositing nanoparticles produced by gas-phase synthesis, using an induction particle generator, onto a substrate. Direct current may be used with minimized corona leakage in the system, which would otherwise be damaging to the induction particle generator.

Abstract: The invention related to dust filters (1) which are especially used in operations endangered by gases and comprise filter elements (10) rendered antistatic by means of derivative constituents such as carbon fibres, salts or special steel fibres (26, 27). The filter material (10) is connected to the housing frame (14) by use of conductors (16), bypassing the seal (15), in such a way that a negative electrical charge of the inner chamber of the individual filter element (10) or the dust filter (1) is avoided.

Abstract: An air purifier provides various air purification functions relating to various environmental conditions by increasing a purification function relative to specific contaminants through replacement of a filter based on the environment to be purified. The air purifier includes a main body of a structure allowing air to pass therethrough. A replaceable filter is received into the main body and is replaceable on a basis of the environmental properties of a space to be purified, removing contaminants in the air passing through the main body. Further, the air purifier includes a dust collecting unit to charge dust particles electrically and to collect the dust particles by electrostatic attraction. In addition, a metal filter functions to collect the dust particles charged in the dust collecting unit, and a HEPA filter is used to collect micro-contaminants. The metal filter is positioned in front of the HEPA filter.

Abstract: A flexible bag for receiving flowable material is suspended, as from a gantry, and is tethered transversely and yet has substantially free movement along three sides for complete filling. The length of the tethers may be selected to prevent complete collapse of the bag when empty, and tubular perforated members having an “H” configuration within the bag may be provided for this purpose. Auxiliary structures provide for cooling of materials provided to the bag, their diffusion on inlet to the bag, their recirculation in the bag, and their removal from the bag. Accessories for use with wet gas provide for separation of inlet liquid and drainage of condensate within the bag.

Abstract: A cylindrical or other suitably shaped filter container for insertion into a user's nares to filter inhaled air to remove airborne items. The filter container has two open ends forming a container surrounding filter material. Polypropylene may be used to form the container or tube. Other suitable material such as rubber or other softer material may also be used. The present disclosure further includes a respiration mask having a peripheral seal composed of treated and fluffed polypropylene fibers. An edge seal according to the present disclosure lowers the respiratory resistance of a mask and improves the filtration efficiency. Treated, fluffed, polypropylene may also be used to form a respiration mask, such a mask may also include an edge seal to improve filtration and comfort. Treated, meltblown, polypropylene may also be used to form a filter napkin or handkerchief that may be carried and used in short term or unexpected situations.

Abstract: A surface discharge air cleaning device includes an insulating dielectric body, a discharge electrode formed at the upper surface of the insulating dielectric body, and a ground electrode formed at the lower surface of the insulating dielectric body, the discharge electrode being formed of a closed pattern and at least one non-pattern part, at which the electrode is not formed being disposed in the closed pattern, therefore a uniform and stable plasma formation is accomplished, and the number of hydroxyl radicals and negative ions is increased while the amount of ozone is decreased.