EP0968628B1 - Use of an active discharge electrode for minimizing positive and/or negative charges on moving material webs - Google Patents

Use of an active discharge electrode for minimizing positive and/or negative charges on moving material webs Download PDF

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Publication number
EP0968628B1
EP0968628B1 EP98910741A EP98910741A EP0968628B1 EP 0968628 B1 EP0968628 B1 EP 0968628B1 EP 98910741 A EP98910741 A EP 98910741A EP 98910741 A EP98910741 A EP 98910741A EP 0968628 B1 EP0968628 B1 EP 0968628B1
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Prior art keywords
individual electrodes
case
use according
discharge electrode
active electrode
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Expired - Lifetime
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EP98910741A
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German (de)
French (fr)
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EP0968628A1 (en
Inventor
Ernst August Hahne
Franz Knopf
Udo Lazurka
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Eltex Elektrostatik GmbH
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Eltex Elektrostatik GmbH
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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
    • 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 the use of an active electrode according to the main claim.
  • electrodes are known as passive discharge electrodes in the form of grounded tips or tongues in a variety of embodiments.
  • One of these known discharge electrodes has a number of parallel needle-like individual electrodes as a ground conductor and two symmetrically arranged, completely embedded in an insulator wire-shaped high voltage electrodes (Operating Instructions H-94 / TSU-2, pages 23 and 24 of Spengler Electronic AG).
  • Another known embodiment for use with moving material webs is provided with a-or to achieve a double emission with two rows of parallel needle-shaped individual electrodes ("Operating Instructions” and “Technical Information” electrode on (R44) and double row (R44II) of ELTEX Elektrostatik GmbH ), which are provided with a tip at its free end and connected via a resistor to a high voltage AC power source and serve to discharge or eliminate the positive and / or negative charge on the surface of moving webs, such as are present in gravure printing, wherein one asymmetrically mounted, outermost, connected to earth Erdungsrechen is provided as ground conductor parallel to the row of individual electrodes.
  • an active electrode comprising a plurality of individual needle-shaped electrodes arranged parallel to each other in a single row and two arranged in an electrical one both perpendicular thereto and parallel to and on either side of the single row of individual electrodes Insulator has embedded ground conductors and in which these and each individual electrode are connected to an AC high voltage power source, which operates with a high frequency high voltage at a higher frequency than the mains AC voltage.
  • this known active electrode is used for Koronavor admir behalf by means of a power corona discharge with high power in the form of a "corona jet" in which the surface of a material web is temporarily changed for a subsequent processing step such as printing or gluing microstructural with the result that an electrostatic residual charge remains on the surface of the treated material.
  • This known active corona pre-treatment electrode is thus not for the Use in the discharge of surfaces, in which only at the top of the single electrode ionization of the gas molecules in the surrounding air takes place with a fine glow discharge (GB-2 114 377A page 1, line 71-81).
  • the invention is based on the object to propose the use of an active discharge electrode for minimizing positive and / or negative charges on moving material webs, with the greatest possible discharge in high-speed material webs and in such plastics, in which a charge double layer can form is possible ,
  • the individual electrodes act as passive discharge electrodes, so that at least a minimum of functionality is maintained despite mains failure.
  • This effect in turn, surprisingly does not occur when the connections between the earth conductor and the individual electrodes are reversed, that is to say the earth conductor is connected to the high-voltage alternating-current source and the needle-shaped individual electrodes are grounded.
  • the active discharge electrode according to the use according to the invention is shown in the drawing, which shows a schematic cross section.
  • the discharge electrode designated overall by 5, has a profile 6 which has a fastening groove 7 for fastening the electrode on its rear side.
  • each individual electrode 8 via an ohmic resistance 10 to the not-drawn high-voltage source can be connected, which represents an AC voltage source.
  • ground conductor 11 are provided, which are circular in cross section and may be formed, for example, as a wire. These two ground conductors are perpendicular to the extension 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.

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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)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (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

Die Erfindung betrifft die Verwendung einer aktiven Elektrode gemäss dem Hauptanspruch.The invention relates to the use of an active electrode according to the main claim.

So sind Elektroden als passive Entladeelektroden in Form von geerdeten Spitzen oder Zungen in einer Vielzahl von Ausführungsformen bekannt.Thus, electrodes are known as passive discharge electrodes in the form of grounded tips or tongues in a variety of embodiments.

Darüber hinaus gibt es noch sogenannte aktive Entladeelektroden. Eine dieser bekannten Entladeelektroden weist eine Reihe von zueinander parallelen nadelförmigen Einzelelektroden als Erdleiter und zwei symmetrisch dazu angeordnete, vollständig in einen Isolator eingebettete drahtförmige Hochspannungselektroden auf (Bedienungsanleitung H-94/TSU-2, Seiten 23 und 24 der Spengler Electronic AG). Eine andere bekannte Ausführungsform zum Einsatz bei bewegten Materialbahnen ist mit einer -oder zur Erzielung einer doppelten Emissionmit zwei Reihen von zueinander parallelen nadelförmigen Einzelelektroden versehen ("Betriebsanleitung" sowie "Technische Information" Elektrode ein (R44) und zweireihig (R44II) der ELTEX Elektrostatik GmbH), die mit einer Spitze an ihrem freien Ende versehen und über einen ohmschen Widerstand an eine HochspannungsWechselstromquelle anschließbar sind und zum Entladen oder Beseitigen der positiven und/oder negativen Ladung auf der Oberfläche von bewegten Materialbahnen dienen, wie sie beispielsweise beim Tiefdruck vorhanden sind, wobei ein asymmetrisch angebrachter, aussen liegender, an Erde angeschlossener Erdungsrechen als Erdleiter parallel zu der Reihe von Einzelelektroden vorgesehen ist.In addition, there are so-called active discharge electrodes. One of these known discharge electrodes has a number of parallel needle-like individual electrodes as a ground conductor and two symmetrically arranged, completely embedded in an insulator wire-shaped high voltage electrodes (Operating Instructions H-94 / TSU-2, pages 23 and 24 of Spengler Electronic AG). Another known embodiment for use with moving material webs is provided with a-or to achieve a double emission with two rows of parallel needle-shaped individual electrodes ("Operating Instructions" and "Technical Information" electrode on (R44) and double row (R44II) of ELTEX Elektrostatik GmbH ), which are provided with a tip at its free end and connected via a resistor to a high voltage AC power source and serve to discharge or eliminate the positive and / or negative charge on the surface of moving webs, such as are present in gravure printing, wherein one asymmetrically mounted, outermost, connected to earth Erdungsrechen is provided as ground conductor parallel to the row of individual electrodes.

Die Ueberprüfung solcher bekannter aktiver Entladeelektroden hat ergeben, dass der Wirkungsgrad beim Entladen relativ schlecht ist, und dass noch eine relativ hohe Restaufladung auf der Materialbahn, insbesondere bei mit grösserer Geschwindigkeit als 2 bis 3 m/s schnell laufenden Materialbahnen belassen wird. 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 1014 Ohm und einem spezifischen Durchgangswiderstand von 1014 Ohm * cm.The verification of such known active discharge electrodes has shown that the discharge efficiency is relatively poor, and that a relatively high residual charge is left on the material web, in particular at faster than 2 to 3 m / s high speed webs. The same applies to plastics with closed surfaces z. B. polymer films such as polycarbonate or polyester with a breakdown voltage greater than 4000 volts and a surface resistance greater than 10 14 ohms and a volume resistivity of 10 14 ohm * cm.

Es ist ferner eine aktive Elektrode bekannt (GB-2 114 377A), die eine Vielzahl von parallel zueinander, in einer einzigen Reihe angeordneten nadelförmigen Einzelelektroden und zwei sowohl rechtwinklig zu diesen als parallel zu und beiderseits der einzigen Reihe von Einzelelektroden angeordnete, in einem elektrischen Isolator eingebettete Erdleiter aufweist und bei der diese sowie jede Einzelelektrode an eine Wechselstrom-Hochspannungsquelle angeschlossen sind, die mit einer hochfrequenten Hochspannung mit einer höheren Frequenz als die Netzwechselspannung arbeitet. Diese bekannte aktive Elektrode dient aber zur Koronavorbehandlung mittels einer Power-Koronaentladung mit starker Leistung in Form eines "corona jets", bei der die Oberfläche einer Materialbahn temporär für einen nachfolgenden Bearbeitungsschritt wie Drucken oder Kleben mikrostrukturell mit der Folge verändert wird, dass eine elektrostatische Restladung auf der Oberfläche des behandelten Materials verbleibt. Diese bekannte aktive Koronavorbehandlungs-Elektrode ist somit nicht für den Einsatz bei der Entladung von Oberflächen gedacht, bei dem nur an der Spitze der Einzelelektrode eine Ionisierung der in der umgebenden Luft befindlichen Gasmoleküle bei einer feinen Glimmentladung stattfindet (GB-2 114 377A Seite 1, Zeile 71-81) .There is also known an active electrode (GB-2 114 377A) comprising a plurality of individual needle-shaped electrodes arranged parallel to each other in a single row and two arranged in an electrical one both perpendicular thereto and parallel to and on either side of the single row of individual electrodes Insulator has embedded ground conductors and in which these and each individual electrode are connected to an AC high voltage power source, which operates with a high frequency high voltage at a higher frequency than the mains AC voltage. However, this known active electrode is used for Koronavorbehandlung by means of a power corona discharge with high power in the form of a "corona jet" in which the surface of a material web is temporarily changed for a subsequent processing step such as printing or gluing microstructural with the result that an electrostatic residual charge remains on the surface of the treated material. This known active corona pre-treatment electrode is thus not for the Use in the discharge of surfaces, in which only at the top of the single electrode ionization of the gas molecules in the surrounding air takes place with a fine glow discharge (GB-2 114 377A page 1, line 71-81).

Schliesslich ist es bekannt (DE 27 13 334), bei einer elektrostatischen Substrat-Anpresseinrichtung für eine Druckmaschine eine aktiven Elektrode vorzusehen, die eine Vielzahl von parallel zueinander, in einer einzigen Reihe angeordneten, nadelförmigen Einzelelektroden aufweist, wobei jede Einzelelektrode über je einen ohmschen Widerstand in der Grössenordnung von 50 bis 150 Megaohm an eine Gleichstrom-Hochspannungsquelle angeschlossen ist und wodurch im Kurzschlussfall der maximal fliessende Strom auf einen unkritischen Wert begrenzt wird.Finally, it is known (DE 27 13 334) to provide an electrostatic substrate-pressing device for a printing machine, an active electrode having a plurality of parallel to each other, arranged in a single row, needle-shaped individual electrodes, each individual electrode via a respective ohmic resistance is connected in the order of 50 to 150 megohms to a DC high voltage source and which limits the maximum flowing current to a non-critical value in the event of a short circuit.

Der Erfindung liegt die Aufgabe zu Grunde, die Verwendung einer aktiven Entladeelektrode zum Minimieren von positiven und/oder negativen Ladungen auf bewegten Materialbahnen vorzuschlagen, mit der eine grösstmögliche Entladung bei schnelllaufenden Materialbahnen und bei solchen Kunststoffen, bei denen sich eine Ladungsdoppelschicht ausbilden kann, ermöglicht wird.The invention is based on the object to propose the use of an active discharge electrode for minimizing positive and / or negative charges on moving material webs, with the greatest possible discharge in high-speed material webs and in such plastics, in which a charge double layer can form is possible ,

Diese Aufgabe wird erfindungsgemäss durch den Gegenstand des Hauptanspruchs in überraschend einfacher Weise gelöst.This object is achieved according to the invention by the subject of the main claim in a surprisingly simple manner.

Es hat sich herausgestellt, dass merkwürdigerweise bei Einsatz einer Vielzahl von parallel zueinander verlaufenden Reihen mit nadelförmigen Einzelelektroden das Ergebnis der Entladung nicht etwa verbessert, sondern im Gegenteil sogar verschlechtert wird. Vielmehr hat sich nach Lehre der Erfindung gezeigt, dass die Verwendung einer einzigen 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. Es ist aber von Wichtigkeit, dass für die Speisung der Einzelelektroden eine bezüglich Erde symmetrische Hochspannungsquelle verwendet wird und die Erdleiter geerdet sind. Dann lässt sich selbst bei schnelllaufenden Materialbahnen mit einer Geschwindigkeit in der Grössenordnung von grösser 10 m/s eine grösstmögliche Entladung erzielen. Bei der aktiven Entladeelektrode ergibt sich überdies der Vorteil bei einem Ausfall des Netzes, dass die Einzelelektroden als passive Entladeelektroden wirken, sodass zumindest ein Minimum an Funktionsfähigkeit trotz Netzausfalls 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 nadelförmigen Einzelelektroden an Erde gelegt werden.Strangely, it has been found, strangely enough, when using a plurality of parallel rows of needle-shaped individual electrodes, the result of the discharge is not improved, on the contrary, it is even worsened. Rather, it has been found by teaching the invention that the use of a single row of individual electrodes gives the best results. Furthermore, it has surprisingly been found that the Efficiency is further improved by the fact that the ground conductor is completely surrounded by an electrical insulator. However, it is important that a high-voltage source symmetrical with respect to ground is used to feed the individual electrodes, and that the ground conductors are earthed. Then, even with high-speed material webs with a speed of the order of magnitude of more than 10 m / s, the greatest possible discharge can be achieved. In the case of the active discharge electrode, there is also the advantage in the event of network failure that the individual electrodes act as passive discharge electrodes, so that at least a minimum of functionality is maintained despite mains failure. This effect, in turn, surprisingly does not occur when the connections between the earth conductor and the individual electrodes are reversed, that is to say the earth conductor is connected to the high-voltage alternating-current source and the needle-shaped individual electrodes are grounded.

Zweckmässige Ausgestaltungen und weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet.Advantageous embodiments and further developments of the invention are characterized in the subclaims.

Die aktive Entladeelektrode gemäss der erfindungsgemässen Verwendung ist in der Zeichnung dargestellt, die einen schematischen Querschnitt zeigt.The active discharge electrode according to the use according to the invention is shown in the drawing, which shows a schematic cross section.

Die insgesamt mit 5 bezeichnete Entladeelektrode weist ein Profil 6 auf, das an seiner Rückseite eine Befestigungsnut 7 zum Befestigen der Elektrode aufweist.The discharge electrode, designated overall by 5, has a profile 6 which has a fastening groove 7 for fastening the electrode on its rear side.

Sie ist mit einer einzigen Reihe von zueinander parallel angeordneten nadelförmigen Einzelelektroden 8 versehen, deren freie Enden auf der mit Bezug auf die Befestigungsnut 7 entgegengesetzten Seite angeordnet sind. Die Reihe von Einzelelektroden liegt in einer Ebene 9, die schematisch in der Zeichnung angedeutet ist. Ferner ist jede Einzelelektrode 8 über einen ohmschen 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 each other, whose free ends are arranged on the opposite side with respect to the fastening groove 7. The row of individual electrodes lies in a plane 9, which is schematically indicated in the drawing. Further is Each individual electrode 8 via an ohmic resistance 10 to the not-drawn high-voltage source can be connected, which represents an AC voltage source.

Ferner sind beim wiedergegebenen Ausführungsbeispiel zwei 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 der die Einzelelektroden einer Reihe angeordnet sind. Jeder Leiter ist hierbei von einem elektrischen Isolator 12 umgeben.Further, in the illustrated embodiment, two parallel to each other and arranged on both sides of the row of individual electrodes 8 earth conductor 11 are provided, which are circular in cross section and may be formed, for example, as a wire. These two ground conductors are perpendicular to the extension 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 (7)

  1. Use of an active electrode (5), which has a large number of acicular individual electrodes (8), which are arranged in parallel with one another and in a single row, and two earthing conductors (11), which are arranged both at right angles with respect to these individual electrodes (8) and in parallel with the single row of individual electrodes (8) and on both sides of this row and are embedded in an electrical insulator (12), and each of whose individual electrodes (8) is connected to an HVAC source via in each case one nonreactive resistor (10), as an active discharge electrode (5) for minimizing positive and/or negative charges on moving material webs, the HVAC source having a voltage which is symmetrical with respect to earth, and the two earthing conductors (11) being connected to earth.
  2. Use according to Claim 1, in the case of the active electrode (5), the row of the large number of individual electrodes (8) lying in one plane (9).
  3. Use according to Claim 1, in the case of the active electrode (5), each earthing conductor (11) being circular in cross section.
  4. Use according to Claim 3, in the case of the active electrode (5), each earthing conductor (11) being in the form of a wire.
  5. Use according to Claim 1, in the case of the active electrode (5), the value of the nonreactive resistor being 250 megaohms.
  6. Use according to Claim 1, in the case of the active electrode (5), the distance between the tips of the individual electrodes (8) being between 1 cm and 2 cm, preferably 1.5 cm.
  7. Use according to Claim 1, the HVAC source being in the form of a high-voltage transformer.
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
DE19711342A DE19711342C2 (en) 1997-03-18 1997-03-18 Active discharge electrode
DE19711342 1997-03-18
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 EP0968628A1 (en) 2000-01-05
EP0968628B1 true EP0968628B1 (en) 2006-07-19

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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)

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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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Publication number Publication date
DE59813647D1 (en) 2006-08-31
DE19711342A1 (en) 1998-09-24
ATE333777T1 (en) 2006-08-15
JP2000513870A (en) 2000-10-17
EP0968628A1 (en) 2000-01-05
DE19711342C2 (en) 1999-01-21
US6504700B1 (en) 2003-01-07
WO1998042166A1 (en) 1998-09-24

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