EP3871300B1 - Électrode pour la génération d'un effet couronne - Google Patents

Électrode pour la génération d'un effet couronne 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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EP
European Patent Office
Prior art keywords
core
electrode
electrode according
hold
roof
Prior art date
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Application number
EP19805885.1A
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German (de)
English (en)
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EP3871300A1 (fr
Inventor
Alexander Rau
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.)
Ahlbrandt System GmbH
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Ahlbrandt System GmbH
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Publication date
Application filed by Ahlbrandt System GmbH filed Critical Ahlbrandt System GmbH
Publication of EP3871300A1 publication Critical patent/EP3871300A1/fr
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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

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)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Resistance Heating (AREA)

Claims (11)

  1. Electrode pour la production d'une décharge corona présentant un noyau (2) allongé conducteur de l'électricité et une enveloppe (3) constituée d'un matériau diélectrique avec un canal longitudinal (4) pour le noyau (2), le canal longitudinal (4) étant limité sur sa longueur par un fond et un toit s'étendant sur le fond et le noyau (2) reposant avec sa face inférieure sur le fond du canal longitudinal (4), le noyau (2) étant maintenu sur sa longueur à une certaine distance du toit du canal longitudinal (4) et au moins un élément de maintien en position basse s'étendant entre la face supérieure du noyau (2) et le toit du canal longitudinal (4), caractérisé en ce que chaque élément de maintien en position basse s'appuie sur le toit dans au moins une ligne de contact (10, 11) s'étendant dans la direction longitudinale de l'électrode et sur la face supérieure du noyau (2) dans au moins une ligne de contact (9) s'étendant dans la direction longitudinale.
  2. Electrode selon la revendication 1, caractérisée en ce que le noyau (2) et l'élément de maintien en position basse forment chacun un composant unitaire qui s'étend sur la longueur du canal longitudinal (4) .
  3. Electrode selon la revendication 1 ou 2, caractérisée en ce qu'il n'y a pas plus de 4 lignes de contact et, de préférence, pas plus de 3 lignes de contact (9, 10, 11).
  4. Electrode selon la revendication 3, caractérisée en ce que l'élément de maintien en position basse est formé d'une barre ronde ou d'un tube (5).
  5. Electrode selon la revendication 3, caractérisée en ce que la section transversale intérieure du canal longitudinal (4) est rectangulaire.
  6. Electrode selon la revendication 5, caractérisée en ce qu'une rainure longitudinale (8) est formée soit dans le toit, soit dans le noyau (2), de sorte que la barre ronde ou le tube (5) s'appuie sur les bords de la rainure (6).
  7. Electrode selon la revendication 4, caractérisée en ce que le toit de l'enveloppe intérieure (3) présente deux flancs (12, 13) formant un angle aigu.
  8. Electrode selon la revendication 7, caractérisée en ce qu'une rainure longitudinale (8) est formée au point d'intersection des deux flancs (12, 13).
  9. Electrode selon l'une quelconque des revendications précédentes, caractérisée en ce que plusieurs éléments de maintien en position basse sont disposés en parallèle.
  10. Electrode selon l'une quelconque des revendications précédentes, caractérisée en ce qu'un rail s'étend sur sa face supérieure pour la fixation de l'électrode dans une installation de prétraitement par effet corona.
  11. Electrode selon l'une quelconque des revendications précédentes, caractérisée en ce que l'âme (2) et l'élément de maintien en position basse sont tous deux constitués d'un matériau électriquement conducteur, et en ce que l'élément de maintien en position basse est adapté pour être connecté à une source de haute tension.
EP19805885.1A 2018-10-26 2019-10-24 Électrode pour la génération d'un effet couronne Active EP3871300B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018126843.2A DE102018126843A1 (de) 2018-10-26 2018-10-26 Elektrode für die Erzeugung einer Koronaentladung
PCT/DE2019/200120 WO2020083448A1 (fr) 2018-10-26 2019-10-24 Électrode pour la génération d'un effet couronne

Publications (2)

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

Family

ID=68617967

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19805885.1A Active EP3871300B1 (fr) 2018-10-26 2019-10-24 Électrode pour la génération d'un effet couronne

Country Status (4)

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

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 (de) 1995-08-30 1997-03-06 Afs Entwicklungs & Vertriebs G Elektrode für die Coronabehandlung von Folien
DE59900978D1 (de) * 1999-04-21 2002-04-18 Softal Elektronik Gmbh Barrierenelektrode zur Oberflächenbehandlung von elektrisch leitenden oder nichtleitenden Materialien sowie Anordnung derartiger Barrierenelektroden

Also Published As

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

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