EP3871300B1 - Electrode for producing a corona effect - Google Patents

Electrode for producing a corona effect Download PDF

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Publication number
EP3871300B1
EP3871300B1 EP19805885.1A EP19805885A EP3871300B1 EP 3871300 B1 EP3871300 B1 EP 3871300B1 EP 19805885 A EP19805885 A EP 19805885A EP 3871300 B1 EP3871300 B1 EP 3871300B1
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Prior art keywords
core
electrode
electrode according
hold
roof
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German (de)
French (fr)
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EP3871300A1 (en
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Alexander Rau
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Ahlbrandt System GmbH
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Ahlbrandt System 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

Definitions

  • the invention relates to an electrode for generating a corona discharge, comprising a current-conducting elongated core and a casing made of a dielectric material with a longitudinal channel for the core, wherein the longitudinal channel is delimited over its length by a base and a roof extending over the base, and wherein the core rests with its underside on the base of the longitudinal channel, and wherein the core maintains a distance from the roof of the longitudinal channel over its length, and at least one hold-down element runs between the top of the core and the roof of the longitudinal channel.
  • Such electrodes are required for the activating treatment of foils, which are guided over a roller that acts as a counter electrode.
  • the electrode is mounted at a short distance and parallel to the roller so that there is a gap between it and the roller in which a plasma forms when a sufficiently high voltage is applied to the electrode.
  • the foil passes through the gap and is activated by the plasma.
  • the electrode has a casing made of a dielectric material, which is also used to attach it to a corona pretreatment system. Since the electrically conductive metallic core must run at as constant a distance as possible from the roller in order to generate a uniform plasma over the length of the electrode, the core must be fixed in a precise position within the casing.
  • the dielectric material that surrounds the core is generally a ceramic.
  • ceramics are very brittle and have a relatively low coefficient of thermal expansion, so the ceramic must not enclose the core tightly, as The core, which heats up and expands during operation, would otherwise burst the casing.
  • the EP 1 047 165 A1 discloses a barrier electrode in which two longitudinal channels are formed in a tubular base body, with a flat high-voltage conductor resting on the bottom of one of the channels. Above the high-voltage conductor, there is a dielectric filling in the channel which presses the high-voltage conductor against the bottom.
  • the US 4 575 329 A discloses an electrode in which a flat high-voltage conductor rests on the bottom of a dielectric rail that is open at the top and is held there by a metal plate attached to the rail with an adhesive.
  • the invention is therefore based on the object of creating an electrode whose core is positioned precisely in a casing and is also easy to assemble.
  • each hold-down element rests on the roof in at least one contact line extending in the longitudinal direction of the electrode and on the upper side of the core in at least one contact line extending in the longitudinal direction.
  • the hold-down element Since there are no further contacts with the roof and core beyond the limited number of contact lines, there is sufficient room for the hold-down element to expand laterally when the core and the hold-down element heat up. At the same time, however, the hold-down element builds up a sufficiently high holding force that presses the core against the bottom of the casing so that its position in the casing remains constant.
  • hold-down elements can be arranged one behind the other in the longitudinal channel so that the core is pressed against the ground at certain points or in sections.
  • the manufacture of an electrode is simplified if the core and the hold-down element each form a single component that extends over the length of the longitudinal channel.
  • the casing, core and hold-down element can therefore be provided as meter goods, from which sections are cut off according to the desired length of the electrode and then inserted into the longitudinal channel.
  • no more than 4 contact lines are required, and in particular no more than 3 contact lines, in which case one contact line runs along the core and two contact lines along the roof or, conversely, two contact lines run along the core and one along the roof.
  • the core is formed by a flat rod whose flat side rests on the bottom of the casing.
  • the hold-down element is preferably formed from a round rod or a tube, which, when held by a The expansion induced by heating will cause a deformation, whereby the pressure on the contact lines remains low and is not sufficient to burst the coating. This is particularly true for the pipe.
  • the inner cross-section of the longitudinal channel in the enclosure is rectangular, so that the bottom and roof of the enclosure run parallel.
  • a longitudinal groove can be formed either in the roof or in the core, so that the round rod or the tube rests on the edges of the groove and thus two contact lines are formed there.
  • the roof of the inner casing has two flanks enclosing an acute angle, with a contact line running along each flank. This means that the round rod or tube rests on the roof in two contact lines.
  • a longitudinal groove can be formed at the intersection of the two flanks, with the edges of the groove forming the contact lines.
  • the core is made particularly wide, it is also possible to arrange several hold-down elements in parallel.
  • a Rail for fixing the electrode at a distance from a roller which forms the counter electrode Since the electrode is required in a system for the corona treatment of foils, a Rail for fixing the electrode at a distance from a roller which forms the counter electrode.
  • the hold-down element can be designed for connection to a high-voltage source, so that the high-voltage source is connected to the core via the hold-down element and a corresponding potential gradient is established to the counter electrode.
  • the electrode 1 consists of a metallic core 2 and a casing 3 made of a dielectric material, in particular a ceramic.
  • the casing 3 is designed as a profile with a constant cross-section.
  • a longitudinal channel 4 runs through it to accommodate a core 2 in the form of a flat steel and a hold-down element in the form of a tube 5, preferably also made of a metallic material, so that electrical contact with the core 2 can also be made via the tube 5.
  • the casing 3 On its upper side, the casing 3 has a rail with a mounting groove 6 having an undercut 7, in which a corresponding holder, not shown here, can be inserted, which has lateral webs that engage in the undercuts 7.
  • the electrodes are elongated and can extend over several meters, depending on the size of the roller serving as the counter electrode in a system for the corona pretreatment of films.
  • the covering 3 and the core 2 are therefore sold by the meter and can be shortened to the desired length.
  • the core 2 is first inserted into the longitudinal channel 4 so that it rests on the bottom of the longitudinal channel 4.
  • the tube 5 is then pushed along, making contact with the core 2 along a contact line 9 and with the roof of the longitudinal channel 4 along two contact lines 10, 11.
  • the core and the tube can also be inserted into the longitudinal channel 4 at the same time.
  • the longitudinal channel 4 of the casing 3 is in principle rectangular, with an additional longitudinal groove 8 running in the roof, the edges of which form the two contact lines 10 and 11.
  • the cross-sectional shape according to the Fig. 2 is essentially triangular.
  • the roof is formed by two flanks 12, 13 which enclose an acute angle.
  • a contact line 9 to the core 2 and two contact lines 10 and 11 to the flanks 12, 13.
  • a longitudinal groove 13 can be provided where the two flanks meet, the dimensions of which can be selected so that the contact lines 10, 11 run in the edges of the longitudinal groove 8.
  • the casing 2 In the event of heat-induced expansion, the casing 2 is not burst open, since, in particular in the case of a tubular design of the retaining element, this deforms when it expands, so that the contact forces in the contact lines are not increased and bursting of the ceramic casing 2 is avoided.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Resistance Heating (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)

Description

Die Erfindung bezieht sich auf eine Elektrode für die Erzeugung einer Koronaentladung aufweisend einen stromleitenden länglichen Kern und eine aus einem dielektrischen Material bestehende Umhüllung mit einem Längskanal für den Kern, wobei der Längskanal über seine Länge von einem Boden und einem sich über den Boden erstreckenden Dach begrenzt ist und wobei der Kern mit seiner Unterseite auf dem Boden des Längskanals aufliegt und wobei der Kern über seine Länge einen Abstand zum Dach des Längskanals einhält und dass wenigstens ein Niederhalteelement zwischen der Oberseite des Kerns und dem Dach des Längskanals verläuft.The invention relates to an electrode for generating a corona discharge, comprising a current-conducting elongated core and a casing made of a dielectric material with a longitudinal channel for the core, wherein the longitudinal channel is delimited over its length by a base and a roof extending over the base, and wherein the core rests with its underside on the base of the longitudinal channel, and wherein the core maintains a distance from the roof of the longitudinal channel over its length, and at least one hold-down element runs between the top of the core and the roof of the longitudinal channel.

Derartige Elektroden werden benötigt für die aktivierende Behandlung von Folien, die dazu über eine als Gegenelektrode wirkende Walze geführt werden. Die Elektrode wird dazu im geringen Abstand und parallel zu der Walze montiert, so dass zwischen ihr und der Walze ein Spalt vorliegt, in dem sich ein Plasma bildet, wenn eine genügend hohe Spannung an die Elektrode angelegt wird. Die Folie durchläuft den Spalt und wird dabei vom Plasma aktiviert. Um Durchschläge zu verhindern, besitzt die Elektrode eine Umhüllung aus einem dielektrischen Material, die auch der Befestigung in eine Anlage zur Korona-Vorbehandlung dient. Da der stromleitende metallische Kern in einem möglichst gleichbleibenden Abstand zur Walze verlaufen muss, um über die Länge der Elektrode ein gleichmäßiges Plasma zu erzeugen, muss der Kern innerhalb der Umhüllung lagegenau fixiert sein.Such electrodes are required for the activating treatment of foils, which are guided over a roller that acts as a counter electrode. The electrode is mounted at a short distance and parallel to the roller so that there is a gap between it and the roller in which a plasma forms when a sufficiently high voltage is applied to the electrode. The foil passes through the gap and is activated by the plasma. To prevent breakdowns, the electrode has a casing made of a dielectric material, which is also used to attach it to a corona pretreatment system. Since the electrically conductive metallic core must run at as constant a distance as possible from the roller in order to generate a uniform plasma over the length of the electrode, the core must be fixed in a precise position within the casing.

Bei dem dielektrischen Material, das den Kern umhüllt, handelt es sich im Allgemeinen um eine Keramik. Keramiken sind allerdings sehr brüchig und weisen dazu noch einen relativ geringen Wärmeausdehnungskoeffizienten auf, so dass die Keramik den Kern nicht eng umschließen darf, da der sich im Betrieb erwärmende und ausdehnende Kern die Umhüllung andernfalls sprengen würde.The dielectric material that surrounds the core is generally a ceramic. However, ceramics are very brittle and have a relatively low coefficient of thermal expansion, so the ceramic must not enclose the core tightly, as The core, which heats up and expands during operation, would otherwise burst the casing.

Die EP 1 047 165 A1 offenbart eine Barriereelektrode, bei der in einem rohrförmigen Grundkörper zwei Längskanäle ausgebildet sind, wobei in einem der Kanäle ein auf dessen Boden aufliegender, flächiger Hochspannungsleiter verläuft. Oberhalb des Hochspannungsleiters befindet sich in dem Kanal eine dielektrische Füllung, die den Hochspannungsleiter gegen den Boden drückt.The EP 1 047 165 A1 discloses a barrier electrode in which two longitudinal channels are formed in a tubular base body, with a flat high-voltage conductor resting on the bottom of one of the channels. Above the high-voltage conductor, there is a dielectric filling in the channel which presses the high-voltage conductor against the bottom.

Die US 4 575 329 A offenbart eine Elektrode, bei der ein flächiger Hochspannungsleiter auf dem Boden einer nach oben offenen dielektrischen Schiene aufliegt und dort von einer an der Schiene mit einem Kleber befestigten Metallplatte gehalten wird.The US 4 575 329 A discloses an electrode in which a flat high-voltage conductor rests on the bottom of a dielectric rail that is open at the top and is held there by a metal plate attached to the rail with an adhesive.

In der DE 195 31 898 A1 wurde daher schon vorgeschlagen, als Kern eine Spirale zu nutzen, deren Durchmesser dem inneren Querschnitt der Umhüllung entspricht, so dass die Windungen der Spirale an den inneren Wänden der Umhüllung anliegen. Dach und Boden der Umhüllung bilden dazu einen im Querschnitt kreisrunden Längskanal. Da eine Erwärmung der Schraubenfeder keine Vergrößerung ihres Durchmessers bewirken würde, sondern vielmehr eine nach innen gerichtete Verdickung des Federdrahtes, würde kein nach außen wirkenden Druck auf die Umhüllung ausgeübt.In the DE 195 31 898 A1 It has therefore been suggested that a spiral should be used as the core, the diameter of which corresponds to the inner cross-section of the casing, so that the turns of the spiral lie against the inner walls of the casing. The roof and base of the casing form a longitudinal channel with a circular cross-section. Since heating the coil spring would not increase its diameter, but rather cause the spring wire to thicken inwards, no outward pressure would be exerted on the casing.

Es ist allerdings zweifelhaft, ob diese Annahme zutrifft. Darüber hinaus ist es schwierig, die Feder über die Länge der Umhüllung in diese einzufädeln, da die Windungen sich an der Längskanalwand verhaken, so dass die Feder beim Einfädeln immer wieder gestaucht wird.However, it is doubtful whether this assumption is correct. In addition, it is difficult to thread the spring into the casing along its length because the coils get caught on the longitudinal channel wall, so that the spring is repeatedly compressed when threaded through.

Die Erfindung beruht daher auf der Aufgabe, eine Elektrode zu schaffen, deren Kern lagegenau in einer Umhüllung liegt und darüber hinaus leicht zu montieren ist.The invention is therefore based on the object of creating an electrode whose core is positioned precisely in a casing and is also easy to assemble.

Zur Lösung des Problems sieht die Erfindung vor, dass jedes Niederhalteelement in wenigstens einer sich in Längsrichtung der Elektrode erstreckenden Kontaktlinie am Dach und in wenigstens einer sich in Längsrichtung erstreckenden Kontaktlinie an der Oberseite des Kerns anliegt.To solve the problem, the invention provides that each hold-down element rests on the roof in at least one contact line extending in the longitudinal direction of the electrode and on the upper side of the core in at least one contact line extending in the longitudinal direction.

Da über die begrenzte Anzahl von Kontaktlinien hinaus keine weiteren Kontakte zum Dach und zum Kern vorliegen, bleibt bei einer Erwärmung des Kerns und des Niederhalteelements ein genügender Spielraum zur seitlichen Ausdehnung des Niederhalteelements. Gleichzeitig wird aber vom Niederhalteelement eine ausreichend hohe Haltekraft aufgebaut, die den Kern gegen den Boden der Umhüllung drückt, so dass seine Lage in der Umhüllung konstant bleibt.Since there are no further contacts with the roof and core beyond the limited number of contact lines, there is sufficient room for the hold-down element to expand laterally when the core and the hold-down element heat up. At the same time, however, the hold-down element builds up a sufficiently high holding force that presses the core against the bottom of the casing so that its position in the casing remains constant.

Grundsätzlich können mehrere Niederhalteelemente hintereinander in dem Längskanal angeordnet werden, so dass der Kern punkt- oder abschnittsweise gegen den Boden gedrückt wird. Die Herstellung einer Elektrode vereinfacht sich aber, wenn der Kern und das Niederhalteelement jeweils ein einheitliches Bauteil bilden, das sich über die Länge des Längskanals erstreckt. Umhüllung, Kern und Niederhalteelement können daher als Meterware bereitgestellt werden, von der entsprechend der gewünschten Länge der Elektrode Abschnitte abgetrennt werden, die anschließend in den Längskanal eingeführt werden.In principle, several hold-down elements can be arranged one behind the other in the longitudinal channel so that the core is pressed against the ground at certain points or in sections. However, the manufacture of an electrode is simplified if the core and the hold-down element each form a single component that extends over the length of the longitudinal channel. The casing, core and hold-down element can therefore be provided as meter goods, from which sections are cut off according to the desired length of the electrode and then inserted into the longitudinal channel.

Vorzugsweise werden nicht mehr als 4 Kontaktlinien benötigt, und insbesondere nicht mehr als 3 Kontaktlinien, wobei im letzteren Fall eine Kontaktlinie am Kern und zwei Kontaktlinien am Dach bzw. umgekehrt zwei Kontaktlinien am Kern und eine am Dach verlaufen.Preferably, no more than 4 contact lines are required, and in particular no more than 3 contact lines, in which case one contact line runs along the core and two contact lines along the roof or, conversely, two contact lines run along the core and one along the roof.

Um ein quer zur Elektrode ausgedehntes Plasma zu erzeugen, ist vorgesehen, dass der Kern von einem Flachstab gebildet ist, dessen flache Seite auf dem Boden der Umhüllung aufliegt.In order to generate a plasma extending transversely to the electrode, the core is formed by a flat rod whose flat side rests on the bottom of the casing.

Das Niederhalteelement wird vorzugsweise aus einem Rundstab oder einem Rohr gebildet, die bei einer durch eine Erwärmung induzierte Ausdehnung eine Formänderung erfahren, wodurch der Druck auf die Kontaktlinien gering bleibt und nicht ausreichend ist, die Umhüllung zu sprengen. Dies trifft insbesondere für das Rohr zu.The hold-down element is preferably formed from a round rod or a tube, which, when held by a The expansion induced by heating will cause a deformation, whereby the pressure on the contact lines remains low and is not sufficient to burst the coating. This is particularly true for the pipe.

In einer Ausführung ist der innere Querschnitt des Längskanals in der Umhüllung rechteckig, so dass der Boden und das Dach der Umhüllung parallel verlaufen.In one embodiment, the inner cross-section of the longitudinal channel in the enclosure is rectangular, so that the bottom and roof of the enclosure run parallel.

Damit ergibt sich in jeder Querschnittsebene ein Zweipunktkontakt, nämlich zum einen zum Kern und zum anderen zum Dach.This results in a two-point contact in each cross-sectional plane, namely with the core on the one hand and with the roof on the other.

Um eine bessere Fixierung durch eine Dreipunktkontaktierung zu erreichen, kann entweder im Dach oder in dem Kern eine Längsnut ausgebildet sein, so dass der Rundstab bzw. das Rohr an den Kanten der Nut anliegt und somit dort zwei Kontaktlinien gebildet sind.In order to achieve a better fixation by means of a three-point contact, a longitudinal groove can be formed either in the roof or in the core, so that the round rod or the tube rests on the edges of the groove and thus two contact lines are formed there.

Denkbar wäre aber auch, dass das Dach der inneren Umhüllung zwei einen spitzen Winkel einschließende Flanken aufweist, wobei in jeder Flanke jeweils eine Kontaktlinie verläuft. Damit liegt der Rundstab bzw. das Rohr in zwei Kontaktlinien am Dach an.It would also be conceivable that the roof of the inner casing has two flanks enclosing an acute angle, with a contact line running along each flank. This means that the round rod or tube rests on the roof in two contact lines.

Aber auch hier kann im Schnittpunkt der beiden Flanken eine Längsnut ausgebildet sein, wobei die Kanten der Nut die Kontaktlinien bilden.But here too, a longitudinal groove can be formed at the intersection of the two flanks, with the edges of the groove forming the contact lines.

Wenn der Kern besonders breit ausgeführt wird, kann auch vorgesehen werden, dass mehrere Niederhalteelemente parallel angeordnet werden.If the core is made particularly wide, it is also possible to arrange several hold-down elements in parallel.

Da die Elektrode in einer Anlage zur Koronabehandlung von Folien benötigt wird, verläuft an ihrer Oberseite eine Schiene zur Befestigung der Elektrode im Abstand zu einer Walze, die die Gegenelektrode bildet.Since the electrode is required in a system for the corona treatment of foils, a Rail for fixing the electrode at a distance from a roller which forms the counter electrode.

Da sowohl der Kern als auch das Niederhalteelement aus einem elektrisch leitenden Material bestehen, kann das Niederhalteelement zur Verbindung mit einer Hochspannungsquelle eingerichtet sein, so dass die Hochspannungsquelle über das Niederhalteelement mit den Kern in Verbindung steht und ein entsprechendes Potentialgefälle zu der Gegenelektrode aufgebaut ist.Since both the core and the hold-down element consist of an electrically conductive material, the hold-down element can be designed for connection to a high-voltage source, so that the high-voltage source is connected to the core via the hold-down element and a corresponding potential gradient is established to the counter electrode.

Im Folgenden soll anhand eines Ausführungsbeispiels die Erfindung näher erläutert werden. Dazu zeigen:

Fig. 1
einen Querschnitt durch eine Elektrode in einer ersten Querschnittsform und
Fig. 2
einen Querschnitt durch eine Elektrode in einer zweiten Ausführungsform.
The invention will be explained in more detail below using an exemplary embodiment. Shown are:
Fig.1
a cross section through an electrode in a first cross-sectional shape and
Fig. 2
a cross section through an electrode in a second embodiment.

Zunächst wird auf beide Figuren Bezug genommen und auf die gemeinsamen Elemente der beiden darin dargestellten Ausführungsformen einer Elektrode 1 eingegangen.First, reference is made to both figures and the common elements of the two embodiments of an electrode 1 shown therein are discussed.

Demnach besteht die Elektrode 1 aus einem metallischen Kern 2 und einer Umhüllung 3 aus einem dielektrischen Material, insbesondere einer Keramik. Die Umhüllung 3 ist als Profil mit einem gleichbleibenden Querschnitt ausgebildet. In ihr verläuft ein Längskanal 4 zur Aufnahme eines Kerns 2 in Form eines Flachstahls und einem Niederhalteelement in Form eines Rohres 5, vorzugsweise ebenfalls aus einem metallischen Material, so dass über das Rohr 5 auch eine elektrische Kontaktierung des Kerns 2 erfolgen kann.Accordingly, the electrode 1 consists of a metallic core 2 and a casing 3 made of a dielectric material, in particular a ceramic. The casing 3 is designed as a profile with a constant cross-section. A longitudinal channel 4 runs through it to accommodate a core 2 in the form of a flat steel and a hold-down element in the form of a tube 5, preferably also made of a metallic material, so that electrical contact with the core 2 can also be made via the tube 5.

An ihrer Oberseite besitzt die Umhüllung 3 eine Schiene mit einer eine Hinterschnitte 7 aufweisende Montagenut 6, in der eine entsprechende, hier nicht dargestellte Halterung eingesetzt werden kann, die seitliche Stege aufweist, die in die Hinterschnitte 7 greifen.On its upper side, the casing 3 has a rail with a mounting groove 6 having an undercut 7, in which a corresponding holder, not shown here, can be inserted, which has lateral webs that engage in the undercuts 7.

Die Elektroden sind länglich und erstrecken sich durchaus über mehrere Meter, je nachdem, wie groß die als Gegenelektrode dienende Walze eine Anlage zur Korona-Vorbehandlung von Folien ist. Die Umhüllung 3 und der Kern 2 sind daher Meterware, die entsprechend der gewünschten Länge gekürzt werden.The electrodes are elongated and can extend over several meters, depending on the size of the roller serving as the counter electrode in a system for the corona pretreatment of films. The covering 3 and the core 2 are therefore sold by the meter and can be shortened to the desired length.

Zur Montage einer Elektrode wird zunächst der Kern 2 in den Längskanal 4 eingeschoben, so dass er auf dem Boden des Längskanals 4 aufliegt. Sodann wird das Rohr 5 nachgeschoben, wobei es entlang einer Kontaktlinie 9 Kontakt mit dem Kern 2 und in zwei Kontaktlinien 10, 11 Kontakt mit dem Dach des Längskanals 4 hat. Alternativ können der Kern und das Rohr auch gleichzeitig in den Längskanal 4 eingeführt werden.To mount an electrode, the core 2 is first inserted into the longitudinal channel 4 so that it rests on the bottom of the longitudinal channel 4. The tube 5 is then pushed along, making contact with the core 2 along a contact line 9 and with the roof of the longitudinal channel 4 along two contact lines 10, 11. Alternatively, the core and the tube can also be inserted into the longitudinal channel 4 at the same time.

Im Folgenden wird detailliert die Querschnittsform nach Fig. 1 beschrieben. Der Längskanal 4 der Umhüllung 3 ist im Prinzip rechteckig, wobei zusätzlich im Dach eine Längsnut 8 verläuft, deren Kanten die beiden Kontaktlinien 10 und 11 bilden.In the following, the cross-sectional shape is described in detail Fig.1 The longitudinal channel 4 of the casing 3 is in principle rectangular, with an additional longitudinal groove 8 running in the roof, the edges of which form the two contact lines 10 and 11.

Denkbar wäre aber auch, das Dach flach auszuführen: In diesem Fall liegen nur zwei Kontaktlinien vor, nämlich zum einen zum Kern 2 und zum anderen genau gegenüberliegend am Dach der Umhüllung 2. Gerade bei einer solchen Ausführung können auch zwei oder mehr Rohre parallel zueinander im Längskanal 4 angeordnet werden.However, it would also be conceivable to make the roof flat: In this case, there are only two contact lines, namely one to the core 2 and the other exactly opposite on the roof of the casing 2. Especially with such a design, two or more pipes can be arranged parallel to each other in the longitudinal channel 4.

Die Querschnittsform gemäß der Fig. 2 ist im Wesentlichen dreieckig. Das Dach wird von zwei Flanken 12, 13 gebildet, die einen spitzen Winkel einschließen. Auch hier liegen eine Kontaktlinie 9 zum Kern 2 und zwei Kontaktlinien jeweils 10 und 11 zu den Flanken 12, 13 vor. Außerdem kann im Zusammenlauf der beiden Flanken eine Längsnut 13 vorgesehen werden, wobei deren Abmessung gerade so gewählt werden kann, dass die Kontaktlinien 10, 11 in den Kanten der Längsnut 8 verlaufen.The cross-sectional shape according to the Fig. 2 is essentially triangular. The roof is formed by two flanks 12, 13 which enclose an acute angle. Here too there is a contact line 9 to the core 2 and two contact lines 10 and 11 to the flanks 12, 13. In addition, a longitudinal groove 13 can be provided where the two flanks meet, the dimensions of which can be selected so that the contact lines 10, 11 run in the edges of the longitudinal groove 8.

Durch die Anlage des Rohres 5 in den Kontaktlinien 9, 10, 11 wird über die gesamte Länge des Kerns 2 ein Anpressdruck auf den Boden der Umhüllung 3 ausgeübt, so dass der Kern 2 eine fixierte Position innerhalb der Umhüllung 3 einnimmt. Wird diese durch mehrere Halterungen passgenau im gleichen Abstand zur Walze ausgerichtet, ist der Spalt zwischen dem Kern 2 und der Walze gleichbleibend.By placing the tube 5 in the contact lines 9, 10, 11, a contact pressure is exerted on the bottom of the casing 3 over the entire length of the core 2, so that the core 2 assumes a fixed position within the casing 3. If this is precisely aligned at the same distance from the roller using several holders, the gap between the core 2 and the roller remains constant.

Bei einer wärmebedingten Ausdehnung wird die Umhüllung 2 nicht gesprengt, da insbesondere bei einer Rohrausführung des Halteelementes dieses sich bei einer Ausdehnung verformt, so dass die Anpresskräfte in den Kontaktlinien nicht vergrößert werden und ein Aufsprengen der keramischen Umhüllung 2 vermieden wird.In the event of heat-induced expansion, the casing 2 is not burst open, since, in particular in the case of a tubular design of the retaining element, this deforms when it expands, so that the contact forces in the contact lines are not increased and bursting of the ceramic casing 2 is avoided.

BezugszeichenlisteList of reference symbols

11
Elektrodeelectrode
22
Kerncore
33
UmhüllungWrapping
44
LängskanalLongitudinal channel
55
RohrPipe
66
MontagenutMounting groove
77
HinterschnitteUndercuts
88th
LängsnutLongitudinal groove
99
KontaktlinieContact line
1010
KontaktlinieContact line
1111
KontaktlinieContact line
1212
Flankeflank
1313
Flankeflank

Claims (11)

  1. Electrode for generating a corona discharge, comprising an electrically conducting elongate core (2) and a sheath (3) consisting of a dielectric material with a longitudinal channel (4) for the core (2), wherein the longitudinal channel (4) is bounded across its length by a base and a roof extending over the base, and wherein the core (2) rests with its underside on the base of the longitudinal channel (4), wherein the core (2) maintains a distance from the roof of the longitudinal channel (4) over its length and wherein at least one hold-down element extends between the upper side of the core (2) and the roof of the longitudinal channel (4), characterised in that each hold-down element bears against the roof in at least one contact line (10, 11) extending in the longitudinal direction of the electrode and against the upper side of the core (2) in at least one contact line (9) extending in the longitudinal direction.
  2. Electrode according to claim 1, characterised in that the core (2) and the hold-down element each form a uniform component which extends over the length of the longitudinal channel (4).
  3. Electrode according to claim 1 or 2, characterised in that no more than 4 contact lines and preferably no more than 3 contact lines (9, 10, 11) are present.
  4. Electrode according to claim 3, characterised in that the hold-down element is formed from a round rod or a tube (5).
  5. Electrode according to claim 3, characterised in that the inner cross-section of the longitudinal channel (4) is rectangular.
  6. Electrode according to claim 5, characterised in that a longitudinal groove (8) is formed either in the roof or in the core (2), so that the round bar or the tube (5) rests against the edges of the groove (6).
  7. Electrode according to claim 4, characterised in that the roof of the inner sheath (3) has two flanks (12, 13) enclosing an acute angle.
  8. Electrode according to claim 7, characterised in that a longitudinal groove (8) is formed at the intersection of the two flanks (12, 13).
  9. Electrode according to any of the preceding claims, characterised in that several hold-down elements are arranged in parallel.
  10. Electrode according to any of the preceding claims, characterised in that a rail for fixing the electrode in a corona pre-treatment system extends on its upper side.
  11. Electrode according to any of the preceding claims, characterised in that both the core (2) and the hold-down element consist of an electrically conductive material, and in that the hold-down element is designed for connection to a high-voltage source.
EP19805885.1A 2018-10-26 2019-10-24 Electrode for producing a corona effect Active EP3871300B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018126843.2A DE102018126843A1 (en) 2018-10-26 2018-10-26 Electrode for generating a corona discharge
PCT/DE2019/200120 WO2020083448A1 (en) 2018-10-26 2019-10-24 Electrode for producing a corona effect

Publications (2)

Publication Number Publication Date
EP3871300A1 EP3871300A1 (en) 2021-09-01
EP3871300B1 true EP3871300B1 (en) 2024-04-10

Family

ID=68617967

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19805885.1A Active EP3871300B1 (en) 2018-10-26 2019-10-24 Electrode for producing a corona effect

Country Status (4)

Country Link
EP (1) EP3871300B1 (en)
DE (2) DE102018126843A1 (en)
DK (1) DK3871300T3 (en)
WO (1) WO2020083448A1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4145386A (en) * 1977-06-29 1979-03-20 Union Carbide Corporation Method for the surface treatment of thermoplastic materials
US4575329A (en) * 1984-01-09 1986-03-11 Andreas Ahlbrandt Electrode element for corona treater
DE19531898A1 (en) 1995-08-30 1997-03-06 Afs Entwicklungs & Vertriebs G Electrode for corona treatment of plastic films
DK1047165T3 (en) * 1999-04-21 2002-05-21 Softal Elektronik Gmbh Barrier electrode for surface treatment of electrically conductive or non-conductive materials and arrangement of such barrier electrodes

Also Published As

Publication number Publication date
EP3871300A1 (en) 2021-09-01
DK3871300T3 (en) 2024-05-21
DE112019005305A5 (en) 2021-07-22
WO2020083448A1 (en) 2020-04-30
DE102018126843A1 (en) 2020-04-30

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