EP0646293A1 - Electrode de charge. - Google Patents

Electrode de charge.

Info

Publication number
EP0646293A1
EP0646293A1 EP94909006A EP94909006A EP0646293A1 EP 0646293 A1 EP0646293 A1 EP 0646293A1 EP 94909006 A EP94909006 A EP 94909006A EP 94909006 A EP94909006 A EP 94909006A EP 0646293 A1 EP0646293 A1 EP 0646293A1
Authority
EP
European Patent Office
Prior art keywords
housing
electrode
adee
individual electrodes
electrode according
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.)
Granted
Application number
EP94909006A
Other languages
German (de)
English (en)
Other versions
EP0646293B1 (fr
Inventor
Ernst August Hahne
Franz Knopf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eltex Elektrostatik GmbH
Original Assignee
Eltex Elektrostatik GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Eltex Elektrostatik GmbH filed Critical Eltex Elektrostatik GmbH
Publication of EP0646293A1 publication Critical patent/EP0646293A1/fr
Application granted granted Critical
Publication of EP0646293B1 publication Critical patent/EP0646293B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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

Definitions

  • Electrodes for charging are known in a variety of embodiments (DE-35 22 881). These known electrodes are used to apply electrical surfaces, the tips of the individual electrodes for electrical decoupling being very often connected to the generator supply voltage via series resistors. If such tips are arranged along a straight line and cast in an electrode profile, electrical charging can thus also be operated on printing machines with a working width of several meters, which tendon tendon. As a result of the charging, electrical field forces are used to press substrates onto metal rollers or to block multi-layer substrates.
  • Substrates of different widths are very often used on such printing machines. If coronal currents are applied to a bare metallic surface on the electrode, the surface change or destruction of the rollers is hereby effected. In cases where charging occurs between two electrodes, impermissibly high currents flow where there is no substrate.
  • switchable individual electrodes have become known (DE-29 48 902), which can be adapted to the working width of the printing press by switching individual electrodes on or off.
  • the Switching takes place here via a hydraulic or pneumatic medium, which is fed separately to the single electrode via a pressure-tight line.
  • the switchable individual electrodes take up a large amount of space, so that a large-sized high-voltage electrode results overall. Furthermore, the problems of spark formation when switching th in application areas in explosion-proof rooms are unacceptable, quite apart from the fact that discharge paths, leakage currents etc. still result when the electrodes are switched off.
  • the disadvantage here is that a number of circuits corresponding to the switchable number of individual electrodes plus a line to the high-voltage source is required.
  • the automatic control of the groups of electrodes is complex.
  • the invention is therefore based on the object ter on a I adee e ect rode according to the preamble of the main claim so that any desired number of individual electrodes can be activated or deactivated in the simplest way.
  • the tips of the individual electrodes are poured into a metal housing that is open on one side and if such an electrode is electrically insulated from the housing, the surface of this metal housing will become charged during operation due to the electrical influence. If you coat this metallic housing with electrical insulation, the electrodes work as if they had an electrically insulating plastic housing.
  • the tips of the individual electrodes that protrude on the open side of the metallic housing can be made almost currentless by means of cover slides, which are metal-conductive, preferably made of metal, if the tips of the individual electrodes can be removed by means of the covering device together with the housing receives a high-resistance connection to earth, can be made almost currentless if you cover those tips of the individual electrodes with the covering device that are no longer supposed to emit.
  • the covering device which is electrically conductive, comes in front of an emitting tip of a single electrode, its surface at the point opposite the tip assumes approximately the same potential as that of the tip. This reduces the field strength at the tip to such small values that the emission current practically goes to zero. It has also surprisingly been found that the emission current increases linearly with the number of peaks not covered.
  • FIG. 1 shows a schematic view of a cross section through a charging electrode
  • FIG. 2 shows a schematic side view of the
  • the electrode 6 has a metallic housing 11. Individual electrodes with tips 3 are arranged therein, which can be connected to an electrical high-voltage source via a series resistor 1.
  • the series resistor 1 is embedded in an electrically insulating resin 2 and the tips 3 of the individual electrode protrude from this resin 2.
  • the tip 3 of the individual electrode is arranged at a distance from a paper web 13 which runs over a cooling roller, designated overall by 14.
  • the individual electrode and tip 3 with their series resistor 1 and the electrically insulating resin 2 are arranged in a separate electrode housing 7 which is electrically conductive and preferably consists of metal and is cuboid with a - in the drawing downwardly open side 8 is formed for the tips 3 of the individual electrodes.
  • This electrode housing 7 is provided with an electrical insulation from its outside and inserted into a rectangular recess 9 of the housing 11.
  • grooves 10 are provided for a cover device 4 in the form of a metal slide, which in the illustrated embodiment can be displaced in the grooves 10 in the grooves 10 in a controlled manner by means of a driver 5 in the embodiment shown , so that the tips 3 of the individual electrodes can be covered in any way as shown in FIG. 2 schematically.
  • the housing and the slider 10 have an electrically good conductive connection. Both parts are connected to earth via a resistor of the order of 1 gigohm.
  • the high-voltage source is shown schematically with "U".

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Elimination Of Static Electricity (AREA)
  • Details Of Resistors (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • Thermistors And Varistors (AREA)
  • Emergency Protection Circuit Devices (AREA)
EP94909006A 1993-04-16 1994-02-20 Electrode de charge Expired - Lifetime EP0646293B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4312483 1993-04-16
DE4312483A DE4312483C1 (de) 1993-04-16 1993-04-16 Aufladeelektrode
PCT/EP1994/000487 WO1994024737A1 (fr) 1993-04-16 1994-02-20 Electrode de charge

Publications (2)

Publication Number Publication Date
EP0646293A1 true EP0646293A1 (fr) 1995-04-05
EP0646293B1 EP0646293B1 (fr) 1996-09-25

Family

ID=6485641

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94909006A Expired - Lifetime EP0646293B1 (fr) 1993-04-16 1994-02-20 Electrode de charge

Country Status (7)

Country Link
US (1) US5517384A (fr)
EP (1) EP0646293B1 (fr)
JP (1) JPH07508128A (fr)
AT (1) ATE143535T1 (fr)
DE (2) DE4312483C1 (fr)
ES (1) ES2092405T3 (fr)
WO (1) WO1994024737A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5907468A (en) * 1994-10-19 1999-05-25 Haug Gmbh & Co. Kg Device for applying unipolar electrical charges to a moving electrically-insulated surface using a corona electrode
DE102005048002B4 (de) * 2005-10-06 2010-03-25 Eltex-Elektrostatik Gmbh Hochspannungselektrodenanordnung

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU42298A1 (fr) * 1961-09-12 1962-11-02
US3334227A (en) * 1964-03-24 1967-08-01 Scae Sa Flexible corona discharge electrode with means to vary the length of the emitting portion
US3397136A (en) * 1965-10-07 1968-08-13 Deerpark Machine Co Corona treating apparatus having an electrode with an adjustable width
DE1589743A1 (de) * 1967-08-22 1970-04-30 Eltex Elektronik Gmbh Stabfoermige Ionisationselektrode zum Entladen lichtempfindlicher Materialien
US3578970A (en) * 1968-05-03 1971-05-18 Plastic Coating Corp Variable width corona discharge apparatus with means to shield or vary a predetermined length of a corona discharge wire
AU421643B2 (en) * 1968-11-11 1972-02-23 The Commonwealth Of Australia A method of countour charging
US3890504A (en) * 1973-02-27 1975-06-17 Walco Systems Inc Adjustable corona discharge electrode
IT1103665B (it) * 1978-01-12 1985-10-14 Gianfranco Galimberti Dispositivo per attuare un trattamento superficiale uniforme su materie plastiche mediante scariche elettriche ad effetto corona
US4216518A (en) * 1978-08-01 1980-08-05 The Simco Company, Inc. Capacitively coupled static eliminator with high voltage shield
CH638071A5 (de) * 1979-02-21 1983-08-31 Walter Spengler Hochspannungselektrodenanordnung mit einer anzahl einzeln ein- und ausschaltbarer spitzenelektroden.
US4523082A (en) * 1983-05-05 1985-06-11 Sturdevant Eugene J Electrode shield device
DE3522881C1 (de) * 1985-06-26 1986-10-02 Eltex-Elektrostatik Gesellschaft mbH, 7858 Weil Hochspannungselektrode
DE3725142A1 (de) * 1987-07-29 1989-02-09 Eltex Elektrostatik Gmbh Hochspannungselektrode
GB9020860D0 (en) * 1990-09-25 1990-11-07 Mountain Breeze Ltd Improvements in and relating to air ionisers
DE4105195A1 (de) * 1991-02-20 1992-08-27 Ahlbrandt Andreas Vorrichtung zur behandlung von oberflaechen durch spruehentladungen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9424737A1 *

Also Published As

Publication number Publication date
DE59400738D1 (de) 1996-10-31
ATE143535T1 (de) 1996-10-15
DE4312483C1 (de) 1994-06-09
JPH07508128A (ja) 1995-09-07
US5517384A (en) 1996-05-14
EP0646293B1 (fr) 1996-09-25
ES2092405T3 (es) 1996-11-16
WO1994024737A1 (fr) 1994-10-27

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