EP0295431A1 - 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
EP0295431A1
EP0295431A1 EP88107681A EP88107681A EP0295431A1 EP 0295431 A1 EP0295431 A1 EP 0295431A1 EP 88107681 A EP88107681 A EP 88107681A EP 88107681 A EP88107681 A EP 88107681A EP 0295431 A1 EP0295431 A1 EP 0295431A1
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EP
European Patent Office
Prior art keywords
fibers
face
corona electrode
consist
corona
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.)
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Application number
EP88107681A
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German (de)
English (en)
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EP0295431B1 (fr
Inventor
Till Keesmann
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Individual
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Individual
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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
Application granted granted Critical
Publication of EP0295431B1 publication Critical patent/EP0295431B1/fr
Anticipated expiration legal-status Critical
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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 by corona discharge with the aid of an electrode made of electrically conductive fibers.
  • DE-OS 3 343 063 discloses a device of this type in which a film web is guided and deflected on the circumference of a rotating hollow roller made of insulating material.
  • a brush electrode connected to a high-voltage source is arranged on the inner wall of the hollow roller, the bristles of which are arranged consist of a carbon fiber. The bristles grind on the hollow roller.
  • This brush electrode opposite and opposite the outer surface of the film web is a knife-shaped counter electrode.
  • a desired corona field should form on the exposed surface of the film web, starting with the counter electrode and extending somewhat in the conveying direction.
  • An undesired corona field should be able to form on the inner surface of the hollow roller in the area of the brush electrode, and means for avoiding this are indicated.
  • 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.
  • the corona electrode has non-metallic fibers which are arranged in tufts, individually alongside one another, that the fibers of a tuft end in a common exposed end face, that 10,000 to 500,000, preferably about 100,000, fiber ends or tips are arranged per square centimeter of the end face, that the discharge is in the manner of a peak discharge from these fiber ends is based on the fact that the end face of the corona electrode is exposed and that the end face of the corona electrode faces the surface in a contact-free manner and at a distance from the surface.
  • 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 together, largely parallel to one another and in a bundle of several hundred to many len thousand fibers embedded in a carrier, 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 characteristics of the invention.
  • the distance requires a desirable equalization of the change in potential on the surface and, above all, avoids abrasion of the fiber tips, as 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 tuft 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 peak discharge, but they are connected to the same high-voltage electrical pole over a longer piece of the respective fiber.
  • Electrically conductive, non-metallic materials suitable for the fibers are known and easy, at least easier than many metals, to process into the desired fine fiber structure.
  • the fibers consist of polycrystalline, single-phase or multi-phase Carbon, preferably with a graphite-like structure.
  • the fibers consist of polymers or polymer derivatives which have been made conductive by strong doping, the undoped monomers of which essentially consist of carbon atoms and hydrogen atoms and optionally have some nitrogen atoms or sulfur atoms, the monomers of which are linked to form chains in which the carbon atoms alternate are linked by single and double bonds.
  • the fibers consist of one of the substances listed below or a mixture of these substances, these substances being made conductive by strong notation: 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 - a Overview of synthesis, structure and properties "by Gerhard Wegner, Angew. Chem. 93, pages 352 - 371, Jg, 1981. None appropriately 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, which can be made conductive using the processes of plastics technology to form films, foils, other workpieces and fibers.
  • the production 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 prepared 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, its conductivity increases considerably .
  • suitable catalysts for example with iodine, AsF5, bromine or naphthalene sodium
  • 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, are increasing increasing sales are interpreted in the sense of a phase change from semiconductor to 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 tetracyanquinodimethane.
  • 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 invention, 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.
  • the fibers are preferably embedded in electrically insulating carrier substance, preferably plastic.
  • the electrically insulating carrier substance for mounting 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 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 transversely to the direction of movement over the surface of the element and that the 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 over the entire common length at the same distance from the End face of the corona electrode is arranged, wherein this distance is the smallest distance between the ground electrode and exposed parts of the fibers of the corona electrode and is greater 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 rapidly dissipated through one or more 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.
  • 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 egg ne elongated corona electrode 4 of the type 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 of 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 contacts 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. In relation to the surface normal 32 of this end face at the angle of attack 33 against the direction 34, it is 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 we is considerably 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 may 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)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
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 (fr) 1987-06-19 1987-06-19
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 true EP0295431A1 (fr) 1988-12-21
EP0295431B1 EP0295431B1 (fr) 1991-12-27

Family

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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)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0569004A2 (fr) * 1992-05-06 1993-11-10 Till Keesmann Dispositif pour changer potentiel statique électrique d'une surface en matière isolante
DE19950009B4 (de) * 1999-10-18 2012-11-22 Eltex-Elektrostatik Gmbh Vorrichtung zum Befeuchten einer Materialbahn
EP4016765A1 (fr) * 2020-12-21 2022-06-22 Lorena Leonardos Ioniseur pour l'emission des ions négatifs des fibres de carbone protegé d'une barrière en plastique

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0055984A2 (fr) * 1981-01-05 1982-07-14 Polaroid Corporation Méthode et appareil pour la production de charges relativement élevées sur des matériaux rétenteurs de charges
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0055984A2 (fr) * 1981-01-05 1982-07-14 Polaroid Corporation Méthode et appareil pour la production de charges relativement élevées sur des matériaux rétenteurs de charges
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

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ANGEW. CHEMIE INT. ED. ENGL., Band 20, 1981, Seiten 361-381, Verlag Chemie GmbH, Weinheim, DE; G. WEGNER: "Polymers with metal-like conductivity a review of their synthesis, structure and properties" *
PATENT ABSTRACTS OF JAPAN, Band 4, Nr. 58 (P-9)[540], 30. April 1980, Seite 151 P 9; & JP-A-55 29 837 (NIPPON DENKI K.K.) 03-03-1980 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0569004A2 (fr) * 1992-05-06 1993-11-10 Till Keesmann Dispositif pour changer potentiel statique électrique d'une surface en matière isolante
EP0569004A3 (en) * 1992-05-06 1993-12-15 Till Keesmann Device for changing the static electric potentials of an insulating material surface
DE19950009B4 (de) * 1999-10-18 2012-11-22 Eltex-Elektrostatik Gmbh Vorrichtung zum Befeuchten einer Materialbahn
EP4016765A1 (fr) * 2020-12-21 2022-06-22 Lorena Leonardos Ioniseur pour l'emission des ions négatifs des fibres de carbone protegé d'une barrière en plastique

Also Published As

Publication number Publication date
DE3867141D1 (de) 1992-02-06
ES2029493T3 (es) 1992-08-16
ATE70926T1 (de) 1992-01-15
EP0295431B1 (fr) 1991-12-27

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