EP0295431B1 - Dispositif pour modifier le potentiel électrique statique d'une surface,en matériau isolant,d'un élément en mouvement par décharge corona - Google Patents

Dispositif pour modifier le potentiel électrique statique d'une surface,en matériau isolant,d'un élément en mouvement par décharge corona Download PDF

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Publication number
EP0295431B1
EP0295431B1 EP88107681A EP88107681A EP0295431B1 EP 0295431 B1 EP0295431 B1 EP 0295431B1 EP 88107681 A EP88107681 A EP 88107681A EP 88107681 A EP88107681 A EP 88107681A EP 0295431 B1 EP0295431 B1 EP 0295431B1
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Prior art keywords
fibres
face
electrode
corona
manner
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP88107681A
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German (de)
English (en)
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EP0295431A1 (fr
Inventor
Till Keesmann
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Individual
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Individual
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Publication date
Priority claimed from DE8708551U external-priority patent/DE8708551U1/de
Priority claimed from DE19873738279 external-priority patent/DE3738279A1/de
Application filed by Individual filed Critical Individual
Priority to AT88107681T priority Critical patent/ATE70926T1/de
Publication of EP0295431A1 publication Critical patent/EP0295431A1/fr
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Publication of EP0295431B1 publication Critical patent/EP0295431B1/fr
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T19/00—Devices providing for corona discharge
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T19/00—Devices providing for corona discharge
    • H01T19/04—Devices providing for corona discharge having pointed electrodes
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
    • H05F3/00—Carrying-off electrostatic charges
    • H05F3/04—Carrying-off electrostatic charges by means of spark gaps or other discharge devices

Definitions

  • the invention relates to a device for changing the static, electrical potential on the surface of a moving element formed from insulating material with the aid of an electrode made of electrical fibers, in which the electrode has non-metallic fibers which are arranged in a bundle-like manner, individually alongside one another, and the fibers of a tuft end in a common exposed end face and the electrode with its end face facing the surface is arranged in a contact-free manner and at a distance from the surface.
  • the object of the invention is to design a device of the type mentioned at the outset in such a way that the greatest possible change in potential can be achieved with the simplest possible means.
  • Such electrically conductive, non-metallic materials suitable for fibers are known and easy, at least easier than many metals, to process into the desired fine fiber structure.
  • the fibers consist of one of the substances listed below or a mixture of these substances, these substances being made conductive by strong doping: polyacetylene, polyparaphenylene, polypyrrole, polythiophene, polyaniline.
  • the conductivity takes place along the chains formed from the monomers.
  • This development is characterized in that the chains formed from the monomers extend along the fiber length, so that the fibers consist of bundled chains oriented in the same direction.
  • the invention takes advantage of the fact that certain polymers are excellent insulators in the native state and can be converted into electrically conductive charge transfer complexes in the solid state, as described under the title "Polymers with metal-like conductivity - an overview of synthesis, structure und Properties "by Gerhard Wegner, Angew. Chem. 93, pages 352-371, born 1981.
  • the correspondingly converted polymers gain a metal-like conductivity and are therefore also referred to as organic metals.
  • the metallic conductivity is caused by a charge transfer complex, or CT complex for short, formed by the polymer.
  • the polymers made so conductive can be processed into films, foils, other workpieces and also fibers using the processes of plastics technology.
  • the manufacture of these conductive polymers does not require lengthy syntheses or complex processes. Rather, the conductive polymers are obtained via very simple polymerization processes from easily accessible and industrially available monomers, such as acetylene, benzene, pyrrole and so on, and subsequent strong doping, for example with iodine.
  • Fibers made of doped polyacetylene, which has an extensive pi-electron system in the main chain and have been oxidized or reduced in the solid state to an electrically conductive charge transfer (CT) complex with a metallic conductivity characteristic, are very suitable.
  • a thin film of cis-polyacetylene as can be produced by polymerizing acetylene on the surface of a solution of suitable catalysts in an inert solvent, for example with iodine, AsF5, bromine or naphthalene sodium
  • an inert solvent for example with iodine, AsF5, bromine or naphthalene sodium
  • its conductivity increases considerably .
  • the electrical and optical properties of the conductive polymer for example the low temperature dependence of the conductivity and the drastic increase in absorption in the IR range with increasing conversion, are interpreted in the sense of a phase transition from the semiconductor to the metal. This behavior can be compared to that of a classic semiconductor such as silicon, which is doped with donors or acceptors and thus becomes conductive.
  • Fibers which can advantageously be used for the fibers are tetrathiofulvalene and tetracyanchinomedimethane.
  • Oxide ceramics are also known which conduct or are made electrically conductive and can also be processed into fibers. Such fibers can be used advantageously in connection with the configuration according to claim 3, preferably if they consist of superconducting material.
  • Such superconducting materials are oxide ceramics whose atomic structure, that is to say their crystal structure, can be derived from that of the Cubic Perovskite type of the formula ABO3, where A is a large cation, B is a small cation and O is an oxygen ion.
  • A is a large cation
  • B is a small cation
  • O is an oxygen ion.
  • the structure of the perovskite type is decisive for high-temperature superconductivity.
  • fibers are preferably embedded in electrically insulating carrier substance, preferably plastic.
  • the electrically insulating carrier substance for binding the fibers can consist of ceramic.
  • a carrier it is also recommended to use a plastic that consists of a polymer that can be made conductive by doping. It is then possible and advantageous that this carrier substance is made conductive by strong doping in the areas required for the ionization contact and the electrical connections.
  • a preferred embodiment of a corona electrode which is particularly well suited for the treatment of wide surfaces and in which the potential arrangement is favored by the geometric arrangement, is thereby characterized in that the corona electrode has an elongated end face which extends approximately perpendicular to the longitudinal extension of the fibers, which is directed with its narrow side against the direction of movement of the surface of the element and extends with its longitudinal extension transverse to the direction of movement over the surface of the element and that Corona electrode, based on the surface normal of its end face with respect to the direction perpendicular to the surface at an angle of 10 to 40 ° (degrees), preferably 20 to 30 °, is inclined to the direction of movement of the element.
  • the distance between the end face of the corona electrode and the surface of the element is selected differently depending on the elements to be treated and the other conditions. It is between 0.1 and 80 mm, preferably 0.5 to 30 mm, and should be chosen so that contact between the corona electrode and the surface or the element can be avoided.
  • ground electrode that extends over the entire length of the corona electrode and is arranged over the entire common length with the same distance from the end face of the corona electrode, this distance being the smallest distance between the ground electrode and exposed parts of the fibers of the Corona electrode 1 and larger than the distance between the end face of the corona electrode and the surface of the element.
  • the larger distance between the mass electrode ensures that the corona discharge is drawn off from the surface by the mass electrode.
  • the ionization of the surrounding atmosphere caused by the corona discharge is quickly dissipated by a or several compressed air nozzles, which are directed into the gap between the end face of the corona electrode and the surface of the element.
  • a corona electrode can also be provided on both sides of a moving element. This is particularly recommended when treating foils.
  • Irregularities in the corona formation are to be expected when using fewer peaks.
  • the large number of tips enables an even effect over a larger working width.
  • the working width can extend over several decimeters.
  • the fibers are preferably close to one another, largely parallel to one another and embedded in a bundle of several hundred to many thousands of fibers in a carrier substance, preferably in heat-resistant, electrically insulating plastic or ceramic.
  • the ends of these fibers protrude from the carrier material on the end face, which forms the surface of the ionizing element. They form a multitude of peaks at which corona discharge can take place.
  • a distance is provided between the fiber ends and the surface of the insulating material to be treated. Despite this distance, the desired change in potential can take place with sufficient intensity due to the other characterization of the invention.
  • the distance requires a desirable equalization of the potential change on the surface and, above all, avoids abrasion of the fiber tips, which would be inevitable in the event of contact with the moving surface. Such abrasion takes place unevenly and, after a short period of operation, leads to an uneven end face of the fiber bundle and thus also to an uneven potential formation. This then requires repair.
  • the ends of the fibers that protrude from the carrier are preferably not in direct electrical contact with one another in the interest of corona discharge, but they are connected to the same high-voltage electrical pole, namely over a longer piece of the respective fiber.
  • 70 denotes a clip made of carbon or metal, which is stable and self-supporting.
  • a continuous tuft 71 of electrically conductive fibers 68 is enclosed in this bracket.
  • These fibers can consist of materials as characterized in claims 2 to 5.
  • the individual fibers 68 extend alongside one another, they end in a common end face 69. 10,000 to 500,000, preferably 100,000, fiber ends are arranged per square centimeter end face. Peak discharge for ionization takes place at these fiber ends.
  • the fibers are embedded in an electrically insulating carrier substance, preferably plastic. Only the tips or the ends of the fibers on the end face 69 protrude from this carrier substance, which is not visible in the drawing.
  • Such a corona electrode can have, for example, the following dimensions: length according to arrow 73, 500 mm (millimeters), height according to arrow 74, 5 mm, width according to arrow 76, 3 mm, total height according to arrow 77, 7 mm, tuft width according to arrow 78, 2 mm.
  • the corona electrodes can also be manufactured with considerably smaller dimensions.
  • the corona electrode 67 is rod-shaped and self-supporting. There is an electrically conductive connection between the clamp 70 and all the fibers 68 of the tuft 71.
  • Corona electrodes according to Figures 1 and 2 can be arranged in groups next to each other on a wall.
  • the bracket 70 is elongated and consequently the end face 69 is also elongated and the end face has the shape of an elongated rectangle.
  • the clamp 70 can also consist of a polymer or polymer derivative made conductive by strong doping and the carrier substance can be made conductive by strong doping in the areas required for the ionization contact and the electrical connections.
  • the clamp 70 can also consist of a polymer or polymer derivative made conductive by strong doping and the carrier substance can be made conductive by strong doping in the areas required for the ionization contact and the electrical connections.
  • that part of the clip which is surrounded by the dash-dotted line 55 is made conductive, so that the current supply electrode can be attached to the outside of the clip, while the remaining parts of the clip 70 which are not by the dash-dotted line 55 are electrically insulating.
  • FIG. 3 shows the detail of a plastic film 2 conveyed in the direction of the arrow 1, which is to be treated on its surface 3.
  • This surface 3 is opposite Elongated corona electrode 4 of the type as described in FIGS. 1 and 2, which extends with the longitudinal extent of its end face 7 over the entire width of the film 2, that is to say transversely to the arrow 1, and the surface 3 with a distance according to the double arrow 6 from Faces 5 mm.
  • the end face 7 extends plane-parallel to the surface 3.
  • a ground electrode 8 is arranged on the underside of the film 2 and has an electrode surface 9 which extends plane-parallel to the end surface 7 and touches the underside 10 of the film 2.
  • the electrode surface 9 and the end surface 7 therefore extend plane-parallel to one another with the distance according to double arrow 6 plus the thickness of the film 2.
  • Compressed air nozzles 12 to 16 of a compressed air nozzle arrangement 17 are directed into the space 11 between the end face 7 and surface 3 which is caused by the distance according to the double arrow 6.
  • the compressed air nozzle arrangement 17 is connected to the pressure side of the compressed air generator 18 via a shut-off valve 19.
  • the corona electrode 4 is connected to a voltage generator 20, which generates an output AC voltage or DC voltage of 5,000 to 10,000 volts, preferably in the range of 5,000 volts.
  • the corona electrode 30 is designed with a very narrow end face 31. It is, based on the surface normal 32 of this end face at the angle of attack 33 against the direction 34, directed perpendicularly to the surface 35 of a film 36 to be treated, specifically inclined against the conveying direction indicated by the arrow 37.
  • a ground electrode 38 is arranged downstream of the corona electrode with a distance according to the double arrow 39 from the fibers of the corona electrode, which is essential is greater than the distance according to double arrow 40 between end face 31 and surface 35.
  • the distance according to double arrow 40 is, for example, 5 mm and the distance according to double arrow 39 is, for example, 70 mm.
  • the film 36 is made of plastic.
  • the corona electrode 30 is connected to a DC voltage source 51, the output voltage of which is 5,000 to 10,000 volts, preferably approximately 5,000 volts.
  • a plastic film 52 is passed between two corona electrodes 54 and 41 in the direction of arrow 53.
  • the two corona electrodes are designed and arranged opposite to the film like the corona electrode 4 from FIG. 3, thus with the same distance according to double arrow 42 or 43 of the end face 44 or 45 relative to the respectively facing surface 46 or 47 of the film.
  • mass electrodes 48, 49 are arranged on both sides, the distance to the film web is approximately the same as that of the end face 44, 45, and the distance according to the double arrow 55, 56 to the fibers of the corona electrodes 54, 41 is a multiple of the distance according to the double arrow 42 or 43.
  • the corona electrodes are connected to a voltage source 50, the output voltage of which is 5,000 to 10,000 volts DC or AC.
  • the fibers of the ionization elements shown in the drawings can consist of one or more of the materials specified in claims 2 to 5.
  • the invention can be used in many ways, for example for the treatment of the printing material or of the parts which convey or treat the printing material, in particular the cylinders of a printing press. It is preferably applicable to photocopying devices for treating the photocopying material and / or the surfaces of parts of the photocopying device acting on the photocopying material, in particular of rotating rollers.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Elimination Of Static Electricity (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)

Claims (9)

  1. Dispositif pour modifier le potentiel électrique statique de la surface, en matériau isolant, d'un élément en mouvement, à l'aide d'une électrode formée de fibres électriquement conductrices,
       dans lequel l'électrode (4) présente des fibres non métalliques (68) placées individuellement les unes à côté des autres, longitudinalement, à la façon d'un faisceau, et
       les fibres d'un faisceau se terminent dans une face frontale commune (69) disposée libre, et
       l'électrode est placée avec sa face frontale dirigée vers ladite surface (3) en regard de celle-ci, sans venir en contact avec elle et à une distance (6) de cette surface, caractérisé en ce
       que les fibres sont faites de carbone polycristallin, monophasique ou polyphasique, ayant de préférence une structure semblable à celle du graphite,
       que 10.000 à 500.000, de préférence environ 100.000 extrémités ou pointes de fibres sont disposées par centimètre carré dans la face frontale (69) et
       que la décharge part à la façon d'une décharge par effet couronne de ces extrémités de fibres.
  2. Dispositif pour modifier le potentiel électrique statique de la surface, en matériau isolant, d'un élément en mouvement, à l'aide d'une électrode formée de fibres électriquement conductrices,
       dans lequel l'électrode (4) présente des fibres non métalliques (68) placées individuellement les unes à côté des autres, longitudinalement, à la façon d'un faisceau, et
       les fibres d'un faisceau se terminent dans une face frontale commune (69) disposée libre, et
       l'électrode est placée avec sa face frontale dirigée vers ladite surface (3) en regard de celle-ci, sans venir en contact avec elle et à une distance (6) de cette surface, caractérisé en ce
       que les fibres (68) sont faites de polymères ou de dérivés de polymères rendus conducteurs par un fort dopage, dont les monomères non dopés sont formés essentiellement d'atomes de carbone et d'atomes d'hydrogène et présentent éventuellement quelques atomes d'azote ou de souffre, dont les monomères sont reliés en chaînes dans lesquelles les atomes de carbone sont alternativement reliés entre eux par des liaisons simples et des liaisons doubles,
       que 10.000 à 500.000, de préférence environ 100.000 extrémités ou pointes de fibres sont disposées par centimètre carré dans la face frontale (69) et
       que la décharge part à la façon d'une décharge par effet couronne de ces extrémités de fibres.
  3. Dispositif pour modifier le potentiel électrique statique de la surface, en matériau isolant, d'un élément en mouvement, à l'aide d'une électrode formée de fibres électriquement conductrices,
       dans lequel l'électrode (4) présente des fibres non métalliques (68) placées individuellement les unes à côté des autres, longitudinalement, à la façon d'un faisceau, et
       les fibres d'un faisceau se terminent dans une face frontale commune (69) disposée libre, et
       l'électrode est placée avec sa face frontale dirigée vers ladite surface (3) en regard de celle-ci, sans venir en contact avec elle et à une distance (6) de cette surface, caractérisé en ce
       que les fibres (68) sont faites de céramique oxydée électriquement conductrice, de préférence douée de supraconductivité,
       que 10.000 à 500.000, de préférence environ 100.000 extrémités ou pointes de fibres sont disposées par centimètre carré dans la face frontale (69) et
       que la décharge part à la façon d'une décharge par effet couronne de ces extrémités de fibres.
  4. Dispositif selon la revendication 2, caractérisé en ce
       que les fibres (68) sont formées d'une des substances indiquées ci-après, ou d'un mélange de ces substances, lesquelles ont été rendues conductrices par un fort dopage: polyacétylène, polyparaphénylène, polypyrrole, polythiophène, polyaniline.
  5. Dispositif selon la revendication 2 ou 3, caractérisé en ce
       que les chaînes formées des monomères s'étendent dans le sens de la longueur des fibres, de sorte que les fibres sont constituées de chaînes de même orientation assemblées en paquets.
  6. Dispositif selon une des revendications précédentes, caractérisé en ce
       que les fibres (68) sont noyées dans une substance de support électriquement isolante à l'exception des surfaces des fibres nécessaires pour le contact d'ionisation et pour les connexions électriques,
       que cette substance de support est un polymère ou un dérivé d'un polymère susceptible d'être rendu conducteur par un fort dopage et
       que cette substance de support est rendue conductrice par un fort dopage dans les zones nécessaires pour le contact d'ionisation et les connexions électriques.
  7. Dispositif selon une des revendications précédentes, caractérisé en ce
       que l'électrode à effet couronne possède une face frontale (69) de forme allongée, s'étendant à peu près perpendiculairement au sens de la longueur des fibres (68), qui est dirigée par son petit côté en sens contraire à la direction de mouvement de la surface (3) de l'élément (2) et s'étend par sa dimension longitudinale transversalement à la direction de mouvement sur la surface de l'élément et
       que l'électrode à effet couronne est disposée inclinée de manière que la normale (32) à sa face frontale (31) forme un angle d'inclinaison (33) de 10 à 40° (degrés), de préférence de 20 à 30°, avec la perpendiculaire à la surface (35) de l'élément (36), en sens contraire à la direction de mouvement de l'élément (36).
  8. Dispositif selon une des revendications précédentes, caractérisé en ce
       que la distance entre la face frontale (7) de l'électrode à effet couronne et la surface (3) de l'élément (2) est de 0,1 à 80,0 mm (millimètres), de préférence de 0,5 à 30 mm.
  9. Dispositif selon une des revendications précédentes, caractérisé en ce
       qu'une ou plusieurs tuyères de soufflage d'air comprimé (12-16) sont prévues, qui sont dirigées dans l'intervalle (11) entre la face frontale (7) de l'électrode à effet couronne (4) et la surface (3) de l'élément (2).
EP88107681A 1987-06-19 1988-05-13 Dispositif pour modifier le potentiel électrique statique d'une surface,en matériau isolant,d'un élément en mouvement par décharge corona Expired - Lifetime EP0295431B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88107681T ATE70926T1 (de) 1987-06-19 1988-05-13 Vorrichtung zum veraendern des statischen, elektrischen potentials durch koronaentladung an der aus isoliermaterial gebildeten oberflaeche eines bewegten elements.

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE8708551U DE8708551U1 (de) 1987-06-19 1987-06-19 Vorrichtung zum Verändern des statischen, elektrischen Potentials durch Koronaentladung
DE8708551U 1987-06-19
DE3730227 1987-09-09
DE3730227 1987-09-09
DE19873738279 DE3738279A1 (de) 1987-09-09 1987-11-11 Vorrichtung zum veraendern des statischen, elektrischen potentials durch koronaentladung
DE3738279 1987-11-11

Publications (2)

Publication Number Publication Date
EP0295431A1 EP0295431A1 (fr) 1988-12-21
EP0295431B1 true EP0295431B1 (fr) 1991-12-27

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Application Number Title Priority Date Filing Date
EP88107681A Expired - Lifetime EP0295431B1 (fr) 1987-06-19 1988-05-13 Dispositif pour modifier le potentiel électrique statique d'une surface,en matériau isolant,d'un élément en mouvement par décharge corona

Country Status (4)

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EP (1) EP0295431B1 (fr)
AT (1) ATE70926T1 (fr)
DE (1) DE3867141D1 (fr)
ES (1) ES2029493T3 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4214975A1 (de) * 1992-05-06 1993-11-11 Till Keesmann Vorrichtung zum Verändern des statischen elektrischen Potentials einer aus Isoliermaterial gebildeten Oberfläche
DE19950009B4 (de) * 1999-10-18 2012-11-22 Eltex-Elektrostatik Gmbh Vorrichtung zum Befeuchten einer Materialbahn
SI26129A (sl) * 2020-12-21 2022-06-30 Lorena Leonardos Ionizator, naprava za oddajanje negativnih ionov iz ogljikovih nitk, zaščitenih s plastično zaporo in z novo pritrditvijo

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3272402D1 (en) * 1981-01-05 1986-09-11 Polaroid Corp Method and apparatus of producing a relatively high charge on charge-retaining materials
DE3343063A1 (de) * 1983-06-14 1985-06-13 Klaus 4803 Steinhagen Kalwar Vorrichtung zur oberflaechenbehandlung von folienbahnen mittels elektrischer koronaentladungen
US4533523A (en) * 1984-01-09 1985-08-06 Andreas Ahlbrandt Corona treater for plastic film

Also Published As

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EP0295431A1 (fr) 1988-12-21
ES2029493T3 (es) 1992-08-16
ATE70926T1 (de) 1992-01-15
DE3867141D1 (de) 1992-02-06

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