A device comprising a group of electrode elements for two-step electrofilters in a condenser separator, which group of electrode elements comprises at least two strip shaped electrode elements (A, B), or two groups of planar disc-shaped electrode elements (A, B), the electrode elements (A, B) to a major part being comprised of a core (M1), and wherein at least one of the electrode elements (A, B) or group of electrode elements (A, B) is formed of at least two different polymers with different electrical properties, wherein a portion (M1, M3, M3′) of the electrode element (A) that is disposed closest to an adjacent second electrode element (B) in the condenser separator is formed of a polymer having a surface resistivity of more than 1×10.sup.12 ohm/kV, and wherein a second portion of the electrode elements (A, B) is comprised of at least one current conductive element (M2, M2′, M2″) in the form of a polymer in the form of a thin coating on the core (M1) of the electrode elements (A), or is embedded in said core (M1) with an extension that is substantially smaller than the extension of the core (M1), both with respect to the width and the depth.

Provided is an air cleaner that can take a large amount of air in a large space into a dust collector with good efficiency while being lightweight and having easy maintenance. An air cleaner is provided with a drone and a dust collector. The drone has a main body unit and propellers attached to the tips of frames. The dust collector has electric discharge electrodes and a dust collection electrode. The electric discharge electrodes are connected to a booster unit within a central chamber. The booster unit is electrically connected to a control unit in the main body unit. Electric discharge is formed between the dust collection electrode and the electric discharge electrodes, and dust particles in the air are charged and collected by the dust collection electrode.

Provided is an air cleaner that can take a large amount of air in a large space into a dust collector with good efficiency while being lightweight and having easy maintenance. An air cleaner is provided with a drone and a dust collector. The drone has a main body unit and propellers attached to the tips of frames. The dust collector has electric discharge electrodes and a dust collection electrode. The electric discharge electrodes are connected to a booster unit within a central chamber. The booster unit is electrically connected to a control unit in the main body unit. Electric discharge is formed between the dust collection electrode and the electric discharge electrodes, and dust particles in the air are charged and collected by the dust collection electrode.

An electret is disclosed including: a carrier, and polytetrafluoroethylene having a melting point of 35 C. or higher and 320 C. or lower deposited on the carrier, wherein the electret imparts an electrostatic charge to at least one of the carrier and the polytetrafluoroethylene, and has two or more melting point peaks in simultaneous thermogravimetry and differential thermal analysis. An electret filter is disclosed which preferably is used for a filter which requires durability to tobacco smoke. An electret filter is also disclosed having a fluorine-containing component deposited on a fiber surface, wherein an initial QF value is 0.5 mmAq.sup.1 or more in collection efficiency of particles having a particle diameter of 0.3 to 0.5 m at a wind speed of 5 cm/s, and a filter deterioration rate by tobacco smoke loading is 8/(g/m.sup.2) or more.

An electret is disclosed including: a carrier, and polytetrafluoroethylene having a melting point of 35 C. or higher and 320 C. or lower deposited on the carrier, wherein the electret imparts an electrostatic charge to at least one of the carrier and the polytetrafluoroethylene, and has two or more melting point peaks in simultaneous thermogravimetry and differential thermal analysis. An electret filter is disclosed which preferably is used for a filter which requires durability to tobacco smoke. An electret filter is also disclosed having a fluorine-containing component deposited on a fiber surface, wherein an initial QF value is 0.5 mmAq.sup.1 or more in collection efficiency of particles having a particle diameter of 0.3 to 0.5 m at a wind speed of 5 cm/s, and a filter deterioration rate by tobacco smoke loading is 8/(g/m.sup.2) or more.

The present invention relates to an electric dust collection device comprising: an electrification unit; and a dust collection unit provided downstream of the electrification unit, wherein the dust collection unit comprises a plurality of bent parts formed by continuously bending one insulating sheet, each of the plurality of bent parts comprises: two flat surfaces bent so as to face each other at a predetermined interval; and a connection surface connecting respective one ends of the two flat surfaces in the vertical direction and having an opening, one flat surface of the two flat surfaces has an electrode for an anode, and the other one flat surface has an electrode for a cathode.

The present disclosure relates to an electric dust collector for generating an electric field by a high voltage electrode formed of a polymer. An electric dust collector according to the present disclosure includes a high voltage electrode to which a high voltage is applied, composed of a thermoplastic polymer and an inherently dissipative polymer, and a ground electrode to be grounded to generate the electric field with the high voltage electrode.

The present disclosure relates to an electric dust collector for generating an electric field by a high voltage electrode formed of a polymer. An electric dust collector according to the present disclosure includes a high voltage electrode to which a high voltage is applied, composed of a thermoplastic polymer and an inherently dissipative polymer, and a ground electrode to be grounded to generate the electric field with the high voltage electrode.

A standing chair comprises a main frame support assembly with a first frame support and a second frame support, at least two collapsible support arms with a first end and a second end, at least one bracket, at least one seat assembled to the collapsible support arms, a drive member positioned between right frame support and one collapsible support arm, another drive member positioned between left frame support and other collapsible support arm and a foot rest assembly with a pair of leg support bars. Right and left frame supports are parallelly connected and locked via a connecting means. The first ends of collapsible arms are moveably affixed to both right and left frame supports, whereas second ends are pivotally connected to a backrest support via fasteners. The two collapsible support arms are configured to automatically collapse and retract in accordance to sitting or standing mode of the standing chair.

Entrance of liquid is sufficiently prevented while electrical conductivity of a carbon material is maintained. A composite 1 includes a substrate 2 and a conductive layer 3 formed on the substrate 2. The substrate 2 includes: a carbon material including a carbon component; and hydrophobic resin.