EP0968628A1 - Active discharge electrode for minimizing positive and/or negative charges on moving material webs - Google Patents

Active discharge electrode for minimizing positive and/or negative charges on moving material webs

Info

Publication number
EP0968628A1
EP0968628A1 EP98910741A EP98910741A EP0968628A1 EP 0968628 A1 EP0968628 A1 EP 0968628A1 EP 98910741 A EP98910741 A EP 98910741A EP 98910741 A EP98910741 A EP 98910741A EP 0968628 A1 EP0968628 A1 EP 0968628A1
Authority
EP
European Patent Office
Prior art keywords
electrode according
individual electrodes
earth conductor
discharge electrode
active discharge
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
EP98910741A
Other languages
German (de)
French (fr)
Other versions
EP0968628B1 (en
Inventor
Ernst August Hahne
Franz Knopf
Udo Lazurka
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 EP0968628A1 publication Critical patent/EP0968628A1/en
Application granted granted Critical
Publication of EP0968628B1 publication Critical patent/EP0968628B1/en
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
    • 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

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Elimination Of Static Electricity (AREA)
  • Primary Cells (AREA)
  • Secondary Cells (AREA)

Abstract

The invention concerns an active discharge electrode (5) for minimizing positive and/or negative charges on moving material webs. The active discharge electrode (5) comprises a plurality of needle-shaped individual electrodes (8) which are disposed mutually parallel and can be connected to a high-voltage source, preferably a high-voltage transformer. The active discharge electrode (5) further comprises at least one earthing conductor (11) extending at right angles to and along the plurality of individual electrodes (8).

Description

Aktive Entladeelektrode zum Minimieren von positiven und / oder negativen Ladungen auf bewegten MaterialbahnenActive discharge electrode to minimize positive and / or negative charges on moving material webs
Die Erfindung betrifft eine aktive Entladeelektrode gemass dem Oberbegriff des Hauptanspruchs.The invention relates to an active discharge electrode according to the preamble of the main claim.
Entladeelektroden sind als passive Entladeelektroden in Form von geerdeten Spitzen oder Zungen in einer Vielzahl von Ausführungsformen bekannt. Darüber hinaus gibt es noch sogenannte aktive Entladeelektroden, die an eine Hochspannungs- Wechselstromquelle anschliessbar sind. Sie dienen zum Entladen oder Beseitigen der positiven und / oder negativen Ladung auf der Oberfläche von vorzugsweise schnellbewegten Materialbahnen, wie sie beispielsweise beim Tiefdruck vorhanden sind.Discharge electrodes are known as passive discharge electrodes in the form of grounded tips or tongues in a variety of embodiments. There are also so-called active discharge electrodes that can be connected to a high-voltage alternating current source. They are used for unloading or removing the positive and / or negative charge on the surface of preferably rapidly moving material webs, such as are present for example in gravure printing.
Zumeist weisen diese bekannten aktiven Entladeelektroden zumindest mehrere parallel zueinander angeordnete Reihen von nadeiförmigen Einzelelektroden auf, die innerhalb einer Reihe parallel zueinander mit einer Spitze an ihrem freien Ende versehen angeordnet und an eine Hochspannungsquelle anschliessbar sind. Längs einer Reihe von Elektroden, vorzugsweise parallel dazu ist zumindest ein Erdleiter angeordnet .Most of these known active discharge electrodes have at least several rows of needle-shaped individual electrodes arranged parallel to one another, which are arranged within a row parallel to one another with a tip at their free end and can be connected to a high-voltage source. At least one earth conductor is arranged along a row of electrodes, preferably parallel to it.
Die Ueberprüfung solcher bekannter aktiver Entladeelektroden hat ergeben, dass der Wirkungsgrad beim Entladen relativ schlecht ist und noch eine relativ hohe Restaufladung auf der Materialbahn, insbesondere bei schnelllaufenden Materialbahnen von grösser als 2 -3 Meter / s belässt. Dasselbe gilt bei Kunststoffen mit geschlossenen Oberflächen z. B. Polymerfolien wie Polycarbonat oder Polyester mit einer Durchschlagsspannung von grösser als 4000 Volt und einem Oberflächenwiderstand von grösser als 10 hoch 14 Ohm und einem spezifischen Durchgangswiderstand von 10 hoch 14 Ohm x cm.The examination of such known active discharge electrodes has shown that the efficiency during the discharge is relatively poor and still leaves a relatively high residual charge on the material web, in particular in the case of high-speed material webs of greater than 2 -3 meters / s. The same applies to plastics closed surfaces z. B. polymer films such as polycarbonate or polyester with a breakdown voltage of greater than 4000 volts and a surface resistance of greater than 10 to 14 ohms and a volume resistance of 10 to 14 ohms x cm.
Der Erfindung liegt die Aufgabe zu Grunde, eine aktive Entladeelektrode gemass dem Oberbegriff des Hauptanspruchs so auszubilden, dass eine grösstmögliche Ladung bei schnelllaufenden Materialbahnen und bei den vorstehend genannten Kunststoffen, bei denen sich eine Ladungsdoppelschicht ausbilden kann, ermöglicht wird.The invention is based on the object of designing an active discharge electrode in accordance with the preamble of the main claim in such a way that the greatest possible charge is possible with high-speed material webs and with the abovementioned plastics, in which a charge double layer can form.
Diese Aufgabe wird bei einer Entladeelektrode gemass dem Oberbegriff des Hauptanspruchs erfindungsgemäss durch dessen kennzeichnende Merkmale in überraschend einfacher Weise gelöst.This object is achieved in a discharge electrode according to the preamble of the main claim according to the invention by its characterizing features in a surprisingly simple manner.
Es hat sich herausgestellt, dass merkwürdigerweise bei Einsatz einer Vielzahl von parallel zueinander verlaufenden Reihen mit nadeiförmigen Einzelelektroden das Ergebnis der Entladung nicht etwa verbessert, sondern im Gegenteil sogar verschlechtert wird. Es hat sich nach Lehre der Erfindung gezeigt, dass eine einzige Reihe von Einzelelektroden die besten Ergebnisse zeitigt . Ferner hat sich überraschenderweise herausgestellt, dass der Wirkungsgrad nochmals dadurch verbessert wird, wenn der Erdleiter vollständig von einem elektrischen Isolator umgeben ist. Dann lässt sich selbst bei schnelllaufenden Materialbahnen mit einer Geschwindigkeit in der Grössenordnung von grösser 10m/s eine höchstmögliche Entladung erzielen. Bei der erfindungsgemässen Elektrode ergibt sich überdies der Vorteil bei einem Ausfall des Netzes, dass die Reihe von Einzelelektroden als passive Entladeelektroden wirken, sodass zumindest ein Minimum an Funktionsfähigkeit trotz Netzausfall erhalten bleibt. Dieser Effekt stellt sich wiederum überraschenderweise dann nicht ein, wenn die Anschlüsse zwischen Erdleiter und Einzelelektroden vertauscht werden, also der Erdleiter an die HochspannungswechselStromquelle und die nadeiförmigen Einzelelektroden an Erde festgelegt werden. Erfindungsgemäß werden die Einzelelektroden an eine bezüglich der Erde symmetrische Spannung der Hochspannungswechselstromquelle angelegt .It has been found that, strangely, when a plurality of rows of needle-shaped individual electrodes running parallel to one another are used, the result of the discharge is not improved, but, on the contrary, is even deteriorated. According to the teaching of the invention, it has been shown that a single row of individual electrodes produces the best results. Furthermore, it has surprisingly been found that the efficiency is further improved if the earth conductor is completely surrounded by an electrical insulator. Then, even with high-speed material webs, the highest possible discharge can be achieved at a speed in the order of magnitude of 10 m / s. With the electrode according to the invention, there is also the advantage in the event of a network failure that the row of individual electrodes act as passive discharge electrodes, so that at least a minimum of functionality remains Power failure persists. This effect, surprisingly, does not occur if the connections between the earth conductor and individual electrodes are interchanged, i.e. the earth conductor is attached to the high-voltage alternating current source and the needle-shaped individual electrodes are connected to earth. According to the invention, the individual electrodes are applied to a voltage of the high-voltage alternating current source that is symmetrical with respect to the earth.
Zweckmässige Ausgestaltungen und Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet .Appropriate refinements and developments of the invention are characterized in the subclaims.
Insbesondere zeichnet sich bei Einsatz von 2 parallel zueinander und beiderseits der Reihe von Einzelelektroden vorgesehenen Erdleitern eine Erhöhung des Wirkungsgrades, also eine bessere Entladung ab.In particular, if 2 earth conductors provided in parallel to one another and on both sides of the row of individual electrodes are used, an increase in the efficiency, that is to say a better discharge, becomes apparent.
Wenn darüber hinaus jede Einzelelektrode über einen ohmischen Widerstand an die Hochspannungsquelle angeschlossen wird, so ergibt sich zugleich ein wirksamer Berührungsschütz, der einen schematischen Querschnitt durch eine aktive Entladeelektrode ge ass der Erfindung zeigt.In addition, if each individual electrode is connected to the high-voltage source via an ohmic resistor, this also results in an effective contactor which shows a schematic cross section through an active discharge electrode according to the invention.
Die insgesamt mit 5 bezeichnete Entladeelektrode weist ein Profil 6 auf, das an seiner Rückseite eine Einhängenut 7 zum Befestigen der Elektrode aufweist.The discharge electrode, designated as a whole by 5, has a profile 6 which has a hanging groove 7 on its rear side for fastening the electrode.
Sie ist mit einer einzigen Reihe von zueinander parallel angeordneten nadeiförmigen Einzelelektroden 8 versehen, deren freie Enden mit Bezug auf die Befestigungsnut 7 entgegengesetzten Seite angeordnet sind. Die Reihe von Einzelelektroden liegen in einer Ebene 9, die schematisch in der Zeichnung angedeutet ist. Ferner ist jede Einzelelektrode 8 über einen ohmischen Widerstand 10 an die - nicht gezeichnete - Hochspannungsquelle anschliessbar, die eine Wechselspannungsquelle darstellt.It is provided with a single row of needle-shaped individual electrodes 8 arranged parallel to one another, the free ends of which are arranged with respect to the fastening groove 7 on the opposite side. The row of individual electrodes lie in a plane 9, which is indicated schematically in the drawing. Furthermore, each individual electrode 8 is connected to the via an ohmic resistor 10 - Not shown - High-voltage source can be connected, which is an AC voltage source.
Ferner sind beim wiedergegebenen Ausführungsbeispiel 2 parallel zueinander und beiderseits der Reihe von Einzelelektroden 8 angeordnete Erdleiter 11 vorgesehen, die im Querschnitt kreisförmig ausgebildet sind und beispielsweise als Draht ausgebildet sein können. Diese beiden Erdleiter verlaufen rechtwinklig zu der Erstreckung jeder Einzelelektrode 8 und parallel zu der Ebene 9, in denen die Einzelelektroden einer Reihe angeordnet sind. Jeder Leiter ist hierbei von einem elektrischen Isolator 12 umgeben . Furthermore, in the illustrated embodiment 2, parallel to each other and on both sides of the row of individual electrodes 8, ground conductors 11 are provided, which are circular in cross section and can be formed, for example, as a wire. These two earth conductors run at right angles to the extent of each individual electrode 8 and parallel to the plane 9, in which the individual electrodes of a row are arranged. Each conductor is surrounded by an electrical insulator 12.

Claims

A N S P R U C H EEXPECTATIONS
Aktive Entladeelektrode (5) zum Minimieren von positiven und / oder negativen Ladungen auf bewegten Materialbahnen mit einer Vielzahl von parallel zueinander angeordneten nadeiförmigen Einzelelektroden (8) , die an eine Hochspannungsquelle, vorzugsweise einen Hochspannungstransformator anschliessbar sind, und mit zumindest einem rechtwinklig zu und längs der Vielzahl der Einzelelektroden (8) verlaufenden Erdleiter (11) , dadurch gekennzeichnetActive discharge electrode (5) for minimizing positive and / or negative charges on moving material webs with a plurality of needle-shaped individual electrodes (8) arranged parallel to one another, which can be connected to a high-voltage source, preferably a high-voltage transformer, and with at least one at right angles to and along the A plurality of the individual electrodes (8) extending earth conductor (11), characterized
dass eine einzige Reihe der Vielzahl von parallel zueinander angeordneten Einzelelektroden (8) vorgesehen ist und dass der Erdleiter (11) vollständig von einem elektrischen Isolator (12) umgeben ist.that a single row of the plurality of individual electrodes (8) arranged parallel to one another is provided and that the earth conductor (11) is completely surrounded by an electrical insulator (12).
2. Elektrode nach Anspruch 1, dadurch gekennzeichnet, dass der Erdleiter in dem elektrischen Isolator (12) eingebettet ist.2. Electrode according to claim 1, characterized in that the earth conductor is embedded in the electrical insulator (12).
3. Elektrode nach Anspruch 1 oder 2 dadurch gekennzeichnet, dass die Reihe der Vielzahl von Einzelelektroden (8) in einer Ebene (9) liegt.3. Electrode according to claim 1 or 2, characterized in that the row of the plurality of individual electrodes (8) lies in one plane (9).
4. Elektrode nach einem der Ansprüche 1 - 3, dadurch gekennzeichnet, dass 2 parallel zueinander und beiderseits der Reihe der Vielzahl von Einzelelektroden (8) angeordneten Erdleiter (11) vorgesehen sind. 4. Electrode according to one of claims 1-3, characterized in that 2 parallel to each other and on both sides of the row of the plurality of individual electrodes (8) arranged earth conductor (11) are provided.
5. Elekrode nach einem der Ansprüche 1 - 4 dadurch gekennzeichnet, dass jeder Erdleiter (11) im Querschnitt kreisförmig ausgebildet ist .5. Electrode according to one of claims 1-4, characterized in that each earth conductor (11) is circular in cross section.
Elektrode nach Anspruch 5, dadurch gekennzeichnet, dass der Erdleiter (11) als Draht ausgebildet ist.Electrode according to claim 5, characterized in that the earth conductor (11) is designed as a wire.
7. Elektrode nach einem der Ansprüche 1 - 6, dadurch gekennzeichnet, dass jede Einzelelektrode (8) über einen ohmischen Widerstand (10) an die Hochspannungsquelle anschliessbar ist.7. Electrode according to one of claims 1-6, characterized in that each individual electrode (8) can be connected to the high-voltage source via an ohmic resistor (10).
8. Elekrode nach Anspruch 7, dadurch gekennzeichnet, dass der ohmische Widerstand 250 Megaohm beträgt.8. Electrode according to claim 7, characterized in that the ohmic resistance is 250 megohms.
Elektrode nach einem der Ansprüche 1 - 8 , dadurch gekennzeichnet, dass der Abstand der Spitzen der Einzelelektroden (8) zwischen 1 und 2, vorzugsweise bei 1,5 cm liegt.Electrode according to one of claims 1-8, characterized in that the distance between the tips of the individual electrodes (8) is between 1 and 2, preferably 1.5 cm.
10. Elektrode nach einem der Ansprüche 1 - 9, dadurch gekennzeichnet, dass die Elektroden an eine bezüglich Erde symmetrische Hochspannungswechselstromquelle anlegbar sind. 10. Electrode according to one of claims 1-9, characterized in that the electrodes can be applied to a high-voltage alternating current source which is symmetrical with respect to earth.
EP98910741A 1997-03-18 1998-03-10 Use of an active discharge electrode for minimizing positive and/or negative charges on moving material webs Expired - Lifetime EP0968628B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19711342 1997-03-18
DE19711342A DE19711342C2 (en) 1997-03-18 1997-03-18 Active discharge electrode
PCT/EP1998/001382 WO1998042166A1 (en) 1997-03-18 1998-03-10 Active discharge electrode for minimizing positive and/or negative charges on moving material webs

Publications (2)

Publication Number Publication Date
EP0968628A1 true EP0968628A1 (en) 2000-01-05
EP0968628B1 EP0968628B1 (en) 2006-07-19

Family

ID=7823825

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EP98910741A Expired - Lifetime EP0968628B1 (en) 1997-03-18 1998-03-10 Use of an active discharge electrode for minimizing positive and/or negative charges on moving material webs

Country Status (6)

Country Link
US (1) US6504700B1 (en)
EP (1) EP0968628B1 (en)
JP (1) JP2000513870A (en)
AT (1) ATE333777T1 (en)
DE (2) DE19711342C2 (en)
WO (1) WO1998042166A1 (en)

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Also Published As

Publication number Publication date
DE19711342C2 (en) 1999-01-21
ATE333777T1 (en) 2006-08-15
DE59813647D1 (en) 2006-08-31
US6504700B1 (en) 2003-01-07
WO1998042166A1 (en) 1998-09-24
EP0968628B1 (en) 2006-07-19
JP2000513870A (en) 2000-10-17
DE19711342A1 (en) 1998-09-24

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