EP2384096A2 - Rotation head for a device for corona treatment of surfaces - Google Patents

Rotation head for a device for corona treatment of surfaces Download PDF

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Publication number
EP2384096A2
EP2384096A2 EP11003511A EP11003511A EP2384096A2 EP 2384096 A2 EP2384096 A2 EP 2384096A2 EP 11003511 A EP11003511 A EP 11003511A EP 11003511 A EP11003511 A EP 11003511A EP 2384096 A2 EP2384096 A2 EP 2384096A2
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EP
European Patent Office
Prior art keywords
rotary head
electrodes
base element
workpiece
rotary
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.)
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EP11003511A
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German (de)
French (fr)
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EP2384096A3 (en
Inventor
Jürgen Morlock
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Tantec Oberflachenbehandlung GmbH
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Tantec Oberflachenbehandlung GmbH
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Publication date
Priority claimed from DE201010018922 external-priority patent/DE102010018922B4/en
Priority claimed from DE201020006266 external-priority patent/DE202010006266U1/en
Application filed by Tantec Oberflachenbehandlung GmbH filed Critical Tantec Oberflachenbehandlung GmbH
Publication of EP2384096A2 publication Critical patent/EP2384096A2/en
Publication of EP2384096A3 publication Critical patent/EP2384096A3/en
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/47—Generating plasma using corona discharges
    • H05H1/471—Pointed electrodes
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/47—Generating plasma using corona discharges

Definitions

  • the invention relates to a rotary head for a device for corona treatment of surfaces, which has a base element with at least two high voltage electrodes, and such a device.
  • Such a rotary head for a device for corona treatment of surfaces and a device for such a treatment is known from JP 2008-021 543 A known.
  • a workpiece to be treated, in particular made of plastic between a stationary counter electrode and the rotating electrodes of the rotary head, which is usually coated with ceramic material are, passed through. Since a high-frequency high voltage is applied to the electrodes, a corona discharge takes place through the plastic material.
  • Such a treatment of a plastic surface is often required because plastic surfaces are not wettable in the normal state with liquids, so that application of adhesives, printing inks or the like is not or only insufficiently possible.
  • the corona treatment changes the surface structure of the plastic so that the surface becomes wettable with liquids with a relatively high surface tension.
  • This object is achieved in that the electrodes of the rotary head are arranged radially offset in the circumferential direction.
  • the provided radial displacement of the electrodes of the rotary head according to the invention now has the advantage that a more uniform loading of the material to be treated is achieved, as a more uniform distribution of the corona discharge over the entire width of the material to be treated is achieved:
  • a more uniform loading of the material to be treated is achieved, as a more uniform distribution of the corona discharge over the entire width of the material to be treated is achieved:
  • the known rotary heads which must have a much larger diameter than the width of the material to be treated in order to achieve a sufficiently uniform loading of the material to be treated with the corona discharge, it is no longer necessary in the rotary head according to the invention, this much larger than the width of the treated Form material web.
  • the rotary head according to the invention thus builds significantly more compact than the known rotary heads.
  • An advantageous development of the invention provides that the electrodes are arranged in pairs symmetrically to the center of rotation of the rotary head. Such a measure has the advantage that thereby the emergence of an imbalance is avoided.
  • a further advantageous development of the invention provides that the basic element of the rotary head has two semi-arcs on which the electrodes are arranged.
  • Such a configuration has the advantage that the basic element of the rotary head is relatively easy to build, so that the rotary head according to the invention has only a small rotational mass.
  • a further advantageous development of the invention provides that the basic element of the rotary head has a number of struts on which the electrodes are arranged. Such a measure has the advantage of an open, lightweight design.
  • a further advantageous embodiment of the invention provides that the basic element of the rotary head is disc-shaped. Such a configuration has the advantage that the basic element of the rotary head is relatively easy to design.
  • FIG. 1 is now a device for corona treatment, in particular for Coronavor compliment, a workpiece W, in particular a plastic web, shown, which - in the case shown here - two rotary heads 1, which on the basis of FIGS. 2 to 5 to be described in more detail.
  • the two rotary heads are each driven in rotation by a drive device 2 and acted upon by a high-frequency alternating voltage, which is generated by a voltage generator 3.
  • a counter electrode 4 is arranged such that the workpiece to be treated between the two rotary heads 1 and the counter electrode 4 can be passed.
  • a device for corona treatment of a workpiece, in particular a plastic sheet is known and therefore need not be described in detail.
  • a first embodiment of the rotary head 1 is shown. It has a base element 10, which has a central opening 11 in which a drive shaft of the drive unit 2 assigned to the rotary head 1 can be accommodated, so that in this way the rotary head 1 can be set into a rotational movement about a rotation axis M.
  • the electrodes 12 are also known and therefore need not be described.
  • the individual electrodes 12 are not disposed in the radial direction equidistant from the central axis M, as was the case with known rotary heads, that is to say that all the electrodes have the same distance from the central axis M of the rotary head 1. Rather, it is provided in the described rotary head 1 that arranged in the circumferential direction of the base member 10 of the rotary head 1 individual electrodes 12 are arranged offset from each other in the radial direction. In this case, it is preferred that the electrodes 12 are arranged in pairs symmetrically with respect to the central axis M of the rotary head 1. This has the advantage that in the case of the rapidly rotating rotary head 1, the occurrence of an imbalance is counteracted.
  • the advantages of the arrangement of the electrodes 12 described above result from the following operation of the rotary head 1:
  • the workpiece W is - as from FIG. 1 visible - between the rotary head 1 and the counter electrode 4 moved past at a feed speed.
  • a first electrode 12a which has a distance r 1 from the center M of the rotary head 1, passes over a first strip near the center of the workpiece W almost orthogonally, so that the corona discharge generated in front of the first electrode 12a covers this central region of the workpiece W is applied only for a short period of time, which is essentially given by the width of this strip and the rotational speed of the electrode 12a.
  • the individual electrodes 12 are no longer - as in the known rotary heads - are arranged at the same radial distance from the axis of rotation M of the rotary head 1, but at different distances, it is now by a corresponding selection of the distances of the individual electrodes 12 from the rotation axis M of the rotary head 1 possible to arrange the electrodes 12 such that a higher loading of a certain portion of the workpiece W by an electrode by a smaller application of this area causes by the other electrodes and such a
  • a second electrode 12b of the rotary head 12 which has a distance r 2 from the rotation axis M of the rotary head 1, which is smaller than the distance r 1 of the first electrode 12a of the axis of rotation M now rotates due to the small distance to the rotation axis M of the rotary head 1 at a lower line speed than the first electrode 12a, so that it takes a longer time to pass through the inner strip.
  • the second electrode 12b thus acts on the inner strip longer and thus stronger
  • a third electrode 12c which has a greater distance r 3 from the center of rotation of the rotary head 1 than the first two electrodes 12a, 12b, has a track speed which is significantly greater than that of the first two electrodes, so that they pass through the inner strip takes much less time than the electrodes 12a and 12b.
  • the application of the inner strip is thus significantly less than that which is caused by the electrodes 12a, 12b.
  • the base member 10 consists of two semi-arcs 10a, 10b, on each of which the electrodes 12 are arranged.
  • Such a configuration has the advantage that such a basic element 10 can be easily produced from a round plate, in particular a metal plate, by, in particular for reasons of weight saving, those areas of the round metal plate, which are not required for the attachment of electrodes 12, separated out become.
  • the base element 10 is designed tree-shaped. It has a number of radial struts 22 on which the electrodes 12 are arranged.
  • FIG. 5 now shows a third embodiment of a rotary head 1, wherein the base member 10 is formed as a solid disc, on which the electrodes 12 are arranged as described above.
  • a rotation head 1 for a device for Corona treatment especially for Coronavor compliment
  • a workpiece is created, which is characterized in that the non-equidistant arrangement, the individual electrodes 12 to the rotation axis M of the rotary head 1 a more uniform Actuation of the workpiece W to be treated with the corona discharge generated by the electrodes 12 and thus a more uniform treatment result is given.
  • the measures described cause further that it is no longer necessary in the rotary head 1 in an advantageous manner, the diameter - as it was in the known rotary heads - form larger than the width of the material web to be treated, so that the rotary head 1 described compact builds.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

The head (1) has a base element (10) comprising two high voltage-chargeable electrodes (12, 12a-12c) that are arranged on rods of the base element in a movable manner in a circumferential direction and in a radial direction of the head. The electrodes are arranged symmetrically to a rotational axis of the head, where the base element has a central opening (11) for accommodating a drive shaft of a drive device. The base element is made from a metal plate and designed in a dendriform.

Description

Die Erfindung betrifft einen Rotationskopf für eine Vorrichtung zur Coronabehandlung von Oberflächen, der ein Grundelement mit mindestens zwei hochspannungsbeaufschlagbare Elektroden aufweist, sowie eine derartige Vorrichtung.The invention relates to a rotary head for a device for corona treatment of surfaces, which has a base element with at least two high voltage electrodes, and such a device.

Ein derartiger Rotationskopf für eine Vorrichtung zur Coronabehandlung von Oberflächen sowie eine Vorrichtung für eine derartige Behandlung ist aus der JP 2008-021 543 A bekannt. Hierbei wird ein zu behandelndes Werkstück, insbesondere aus Kunststoff, zwischen einer stationären Gegenelektrode und den rotierenden Elektroden des Rotationskopfs, die üblicherweise mit Keramikmaterial beschichtet sind, hindurchgeführt. Da an den Elektroden eine hochfrequente Hochspannung anliegt, erfolgt eine Coronaentladung durch das Kunststoffmaterial hindurch. Eine solche Behandlung einer Kunststoffoberfläche ist oft erforderlich, da Kunststoffoberflächen im Normalzustand nicht mit Flüssigkeiten benetzbar sind, so dass ein Auftragen von Klebstoffen, Druckfarben oder dergleichen nicht oder nur unzureichend möglich ist. Durch die Coronabehandlung wird die Oberflächenstruktur des Kunststoffs so verändert, dass die Oberfläche mit Flüssigkeiten mit relativ großer Oberflächenspannung benetzbar wird.Such a rotary head for a device for corona treatment of surfaces and a device for such a treatment is known from JP 2008-021 543 A known. Here, a workpiece to be treated, in particular made of plastic, between a stationary counter electrode and the rotating electrodes of the rotary head, which is usually coated with ceramic material are, passed through. Since a high-frequency high voltage is applied to the electrodes, a corona discharge takes place through the plastic material. Such a treatment of a plastic surface is often required because plastic surfaces are not wettable in the normal state with liquids, so that application of adhesives, printing inks or the like is not or only insufficiently possible. The corona treatment changes the surface structure of the plastic so that the surface becomes wettable with liquids with a relatively high surface tension.

Hierbei tritt aber das Problem auf, dass bei einer Oberflächenvorbehandlung mit dem bekannten Rotationskopf eine nur ungleichmäßige Beaufschlagung der Oberfläche der zwischen den einander gegenüberliegenden Elektroden der Vorrichtung hindurchgeführten Kunststoffbahn erfolgt, da durch die rotierenden Elektroden die Ränder der Kunststoffbahn ungleich stärker beaufschlagt werden als deren Mittelbereich. Um dieses Problem zu umgehen, wird bis jetzt derart vorgegangen, dass der Abstand der rotierenden Elektrode vom Rotationsmittelpunkt des Rotationskopfes viel größer als die Breite der zu behandelnden Kunststoffbahn gewählt wird. Dies bedingt aber in nachteiliger Art und Weise einen Rotationskopf mit einem entsprechend großen Durchmesser, also einem Durchmesser, der deutlich größer ist als die Breite der zu behandelnden Materialbahn. Ein derartiger Rotationskopf baut folglich voluminös.In this case, however, the problem arises that in a surface pretreatment with the known rotary head only uneven loading of the surface of the guided between the opposing electrodes of the device plastic web takes place, since the edges of the plastic sheet are acted upon unevenly stronger than the central region by the rotating electrodes. To circumvent this problem, the procedure has hitherto been such that the distance of the rotating electrode from the center of rotation of the rotary head is chosen to be much greater than the width of the plastic web to be treated. However, this disadvantageously requires a rotary head with a correspondingly large diameter, that is, a diameter which is significantly greater than the width of the material web to be treated. Such a rotary head thus builds voluminous.

Aus der DE 103 23 777 und der US 3 555 378 sind Vorrichtungen mit rotierenden Elektrodenanordnungen bekannt, bei denen die Corona-Entladung durch Rotation des Werkstücks über eine Fläche verteilt wird.From the DE 103 23 777 and the US 3 555 378 are devices with rotating electrode assemblies are known in which the corona discharge is distributed by rotation of the workpiece over a surface.

Es ist Aufgabe der vorliegenden Erfindung, einen Rotationskopf der eingangs genannten Art derart weiterzubilden, dass eine gleichmäßigere Beaufschlagung des zu behandelnden Materials erzielt wird.It is an object of the present invention, a rotary head of the type mentioned in such a way that a more uniform loading of the material to be treated is achieved.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass die Elektroden des Rotationskopfs in dessen Umfangsrichtung radial versetzt angeordnet sind.This object is achieved in that the electrodes of the rotary head are arranged radially offset in the circumferential direction.

Die erfindungsgemäße vorgesehene radiale Versetzung der Elektroden des Rotationskopfs besitzt nun den Vorteil, dass hierdurch eine gleichmäßigere Beaufschlagung des zu behandelnden Materials erzielt wird, da dadurch eine gleichmäßigere Verteilung der Coronaentladung über die gesamte Breite des zu behandelnden Materials erzielt wird: Im Gegensatz zu den bekannten Rotationsköpfen, die einen viel größeren Durchmesser als die Breite des zu behandelnden Materials aufweisen müssen, um eine hinreichend gleichmäßige Beaufschlagung des zu behandelnden Materials mit der Coronaentladung zu erreichen, ist es beim erfindungsgemäßen Rotationskopf nun nicht mehr erforderlich, diesen deutlich größer als die Breite der zu behandelnden Materialbahn auszubilden. Der erfindungsgemäße Rotationskopf baut somit deutlich kompakter als die bekannten Rotationsköpfe.The provided radial displacement of the electrodes of the rotary head according to the invention now has the advantage that a more uniform loading of the material to be treated is achieved, as a more uniform distribution of the corona discharge over the entire width of the material to be treated is achieved: In contrast to the known rotary heads , which must have a much larger diameter than the width of the material to be treated in order to achieve a sufficiently uniform loading of the material to be treated with the corona discharge, it is no longer necessary in the rotary head according to the invention, this much larger than the width of the treated Form material web. The rotary head according to the invention thus builds significantly more compact than the known rotary heads.

Eine vorteilhafte Weiterbildung der Erfindung sieht vor, dass die Elektroden paarweise symmetrisch zum Rotationsmittelpunkt des Rotationskopfes angeordnet sind. Eine derartige Maßnahme besitzt den Vorteil, dass hierdurch das Entstehen einer Unwucht vermieden wird.An advantageous development of the invention provides that the electrodes are arranged in pairs symmetrically to the center of rotation of the rotary head. Such a measure has the advantage that thereby the emergence of an imbalance is avoided.

Eine weitere vorteilhafte Weiterbildung der Erfindung sieht vor, dass das Grundelement des Rotationskopfes zwei Halbbögen aufweist, auf denen die Elektroden angeordnet sind. Eine derartige Ausgestaltung besitzt den Vorteil, dass das Grundelement des Rotationskopfes relativ leicht baut, so dass der erfindungsgemäße Rotationskopf nur über eine geringe Rotationsmasse verfügt.A further advantageous development of the invention provides that the basic element of the rotary head has two semi-arcs on which the electrodes are arranged. Such a configuration has the advantage that the basic element of the rotary head is relatively easy to build, so that the rotary head according to the invention has only a small rotational mass.

Eine weitere vorteilhafte Weiterbildung der Erfindung sieht vor, dass das Grundelement des Rotationskopfs eine Anzahl von Streben aufweist, auf denen die Elektroden angeordnet sind. Eine derartige Maßnahme besitzt den Vorteil einer offenen, leichten Bauweise.A further advantageous development of the invention provides that the basic element of the rotary head has a number of struts on which the electrodes are arranged. Such a measure has the advantage of an open, lightweight design.

Eine weitere vorteilhafte Weiterbildung der Erfindung sieht vor, dass das Grundelement des Rotationskopfs scheibenförmig ausgebildet ist. Eine derartige Ausgestaltung besitzt den Vorteil, dass das Grundelement des Rotationskopfs relativ einfach auszubilden ist.A further advantageous embodiment of the invention provides that the basic element of the rotary head is disc-shaped. Such a configuration has the advantage that the basic element of the rotary head is relatively easy to design.

Weitere vorteilhafte Weiterbildungen der Erfindung sind Gegenstand der Unteransprüche.Further advantageous developments of the invention are the subject of the dependent claims.

Weitere Einzelheiten und Vorteile der Erfindung sind den Ausführungsbeispielen zu entnehmen, die im folgenden anhand der Figuren beschrieben werden. Es zeigen:

Figur 1:
ein Ausführungsbeispiel einer Vorrichtung zusammen mit einem erfindungsgemäßen Rotationskopf,
Figuren 2 und 3:
ein erstes Ausführungsbeispiel eines Rotationskopfs,
Figur 4:
ein zweites Ausführungsbeispiel eines Rotationskopfs, und
Figur 5:
ein drittes Ausführungsbeispiels eines Rotationskopfs.
Further details and advantages of the invention can be found in the embodiments, which are described below with reference to the figures. Show it:
FIG. 1:
an embodiment of a device together with a rotary head according to the invention,
FIGS. 2 and 3:
a first embodiment of a rotary head,
FIG. 4:
a second embodiment of a rotary head, and
FIG. 5:
a third embodiment of a rotary head.

In Figur 1 ist nun eine Vorrichtung zur Coronabehandlung, insbesondere zur Coronavorbehandlung, eines Werkstücks W, insbesondere einer Kunststoffbahn, dargestellt, welche - im hier gezeigten Fall - zwei Rotationsköpfe 1 aufweist, die anhand der Figuren 2 bis 5 noch näher beschrieben werden. Die beiden Rotationsköpfe werden jeweils von einer Antriebseinrichtung 2 rotierend angetrieben und mit einer hochfrequenten Wechselspannung beaufschlagt, die von einem Spannungsgenerator 3 erzeugt wird.In FIG. 1 is now a device for corona treatment, in particular for Coronavorbehandlung, a workpiece W, in particular a plastic web, shown, which - in the case shown here - two rotary heads 1, which on the basis of FIGS. 2 to 5 to be described in more detail. The two rotary heads are each driven in rotation by a drive device 2 and acted upon by a high-frequency alternating voltage, which is generated by a voltage generator 3.

Unter den beiden Rotationsköpfen 1 ist eine Gegenelektrode 4 derart angeordnet, dass das zu behandelnde Werkstück zwischen den beiden Rotationsköpfen 1 und die Gegenelektrode 4 hindurchgeführt werden kann. Eine derartige Vorrichtung zur Coronabehandlung eines Werkstücks, insbesondere einer Kunststoffbahn, ist bekannt und muss daher nicht mehr näher beschrieben werden.Under the two rotary heads 1, a counter electrode 4 is arranged such that the workpiece to be treated between the two rotary heads 1 and the counter electrode 4 can be passed. Such a device for corona treatment of a workpiece, in particular a plastic sheet is known and therefore need not be described in detail.

In den Figuren 2 und 3 ist nun ein erstes Ausführungsbeispiel des Rotationskopfs 1 dargestellt. Er weist ein Grundelement 10 auf, welches eine zentrale Öffnung 11 besitzt, in welcher eine Antriebswelle der dem Rotationskopf 1 zugeordneten Antriebseinrichtung 2 aufnehmbar ist, so dass hierdurch der Rotationskopf 1 in eine Drehbewegung um eine Rotationsachse M versetzbar ist. Wie nun am besten aus der Figur 2 ersichtlich ist, weist der Rotationskopf 1 - im hier gezeigten Fall - zehn Elektroden 12 auf, welche über an und für sich bekannte und daher nicht mehr beschriebene Mittel mit der hochfrequenten Wechselspannung beaufschlagt werden. Die Elektroden 12 sind ebenfalls bekannt und müssen daher auch nicht mehr beschrieben werden.In the Figures 2 and 3 Now, a first embodiment of the rotary head 1 is shown. It has a base element 10, which has a central opening 11 in which a drive shaft of the drive unit 2 assigned to the rotary head 1 can be accommodated, so that in this way the rotary head 1 can be set into a rotational movement about a rotation axis M. How best of all FIG. 2 can be seen, the rotary head 1 - in the case shown here - ten electrodes 12, which are acted upon and known per se and therefore no longer described means with the high-frequency AC voltage. The electrodes 12 are also known and therefore need not be described.

Wesentlich ist nun, dass die einzelnen Elektroden 12 nicht - wie es bei bekannten Rotationsköpfen vorgesehen war - in radialer Richtung äquidistant zur Mittelachse M angeordnet sind, dass also sämtliche Elektroden den gleichen Abstand von der Mittelachse M des Rotationskopfs 1 aufweisen. Vielmehr ist beim beschriebenen Rotationskopf 1 vorgesehen, dass die in Umfangsrichtung des Grundelements 10 des Rotationskopfs 1 angeordneten einzelnen Elektroden 12 in radialer Richtung zueinander versetzt angeordnet sind. Hierbei wird bevorzugt, dass die Elektroden 12 paarweise symmetrisch zur Mittelachse M des Rotationskopfs 1 angeordnet sind. Dies besitzt den Vorteil, dass bei dem schnell rotierenden Rotationskopf 1 dem Auftreten einer Umwucht entgegen gewirkt wird.It is essential that the individual electrodes 12 are not disposed in the radial direction equidistant from the central axis M, as was the case with known rotary heads, that is to say that all the electrodes have the same distance from the central axis M of the rotary head 1. Rather, it is provided in the described rotary head 1 that arranged in the circumferential direction of the base member 10 of the rotary head 1 individual electrodes 12 are arranged offset from each other in the radial direction. In this case, it is preferred that the electrodes 12 are arranged in pairs symmetrically with respect to the central axis M of the rotary head 1. This has the advantage that in the case of the rapidly rotating rotary head 1, the occurrence of an imbalance is counteracted.

Die Vorteile der vorstehend beschriebenen Anordnung der Elektroden 12 ergeben sich aus der nachstehend aufgeführten Funktionsweise des Rotationskopfs 1: Das Werkstück W wird - wie aus der Figur 1 ersichtlich - zwischen dem Rotationskopf 1 und der Gegenelektrode 4 mit einer Vorschubgeschwindigkeit vorbeibewegt. Eine erste Elektrode 12a, welche vom Mittelpunkt M des Rotationskopfs 1 einen Abstand r1 aufweist, überstreicht einen nahe an der Mitte der Werkstück W liegenden - gedachten - ersten Streifen nahezu orthogonal, so dass die vor der ersten Elektrode 12a erzeugte Coronaentladung diesen Mittelbereich des Werkstücks W nur während einer kurzen Zeitdauer beaufschlagt, die im wesentlichen durch die Breite dieses Streifens und der Rotationsgeschwindigkeit der Elektrode 12a gegeben ist. Die Zeit, welche nun die erste Elektrode 12a braucht, um einen gewissen Streifen der Werkstückbahn zu durchqueren, steigt nun von diesem inneren Streifen bis zu einem am Rand der Werkstückbahn W liegenden (gedachten) Streifen deutlich an, da die erste Elektrode 12a diesen äußeren Streifen nun nicht mehr - wie den inneren Streifen - im wesentlichen orthogonal überstreicht, sondern - vereinfacht gesprochen - im wesentlichen parallel zu der Richtung des Streifens geführt wird. Dies bringt mit sich, dass dieser äußere Streifen über einen viel längeren Zeitraum von der Coronaentladung beaufschlagt wird, als der nahe der Mitte der Werkstückbahn gelegene innere Streifen, so dass hierdurch eine unterschiedliche Beaufschlagung der Werkstückbahn W durch die erste Elektrode 12a gegeben ist.The advantages of the arrangement of the electrodes 12 described above result from the following operation of the rotary head 1: The workpiece W is - as from FIG. 1 visible - between the rotary head 1 and the counter electrode 4 moved past at a feed speed. A first electrode 12a, which has a distance r 1 from the center M of the rotary head 1, passes over a first strip near the center of the workpiece W almost orthogonally, so that the corona discharge generated in front of the first electrode 12a covers this central region of the workpiece W is applied only for a short period of time, which is essentially given by the width of this strip and the rotational speed of the electrode 12a. The time, which now takes the first electrode 12a to pass through a certain strip of the workpiece web, now rises clearly from this inner strip to a (imaginary) strip located at the edge of the workpiece web W, since the first electrode 12a covers this outer strip now no longer - as the inner strip - sweeps over substantially orthogonal, but - in simple terms - is guided substantially parallel to the direction of the strip. This entails that this outer strip is acted upon by the corona discharge for a much longer period of time than the inner strip located near the middle of the workpiece path, so that a different loading of the workpiece web W by the first electrode 12a is provided.

Indem nun bei dem beschriebenen Rotationskopf 1 vorgesehen ist, dass die einzelnen Elektroden 12 nun nicht mehr - wie bei den bekannten Rotationsköpfen - in der gleichen radialen Entfernung von der Rotationsachse M des Rotationskopfs 1 angeordnet sind, sondern in unterschiedlichen Abständen, ist es nun durch eine entsprechende Auswahl der Abstände der einzelnen Elektroden 12 von der Rotationsachse M des Rotationskopfs 1 möglich, die Elektroden 12 derart anzuordnen, dass eine höhere Beaufschlagung eines gewissen Bereichs des Werkstücks W durch eine Elektrode durch eine geringere Beaufschlagung dieses Bereichs durch die anderen Elektroden bewirkt und derart eine gleichmäßigere Gesamtbeaufschlagung dieses Bereichs erzielt wird: Eine zweiten Elektrode 12b des Rotationskopfs 12, die von der Rotationsachse M des Rotationskopfs 1 einen Abstand r2 aufweist, der kleiner als der Abstand r1 der ersten Elektrode 12a der Rotationsachse M ist, rotiert nun aufgrund des geringen Abstandes zur Rotationsachse M des Rotationskopfs 1 mit einer geringeren Bahngeschwindigkeit als die erste Elektrode 12a, so dass sie eine längere Zeit benötigt, um den inneren Streifen zu durchlaufen. Die zweite Elektrode 12b beaufschlagt somit den inneren Streifen länger und somit stärker als die erste Elektrode 12a.By now provided in the described rotary head 1 that the individual electrodes 12 are no longer - as in the known rotary heads - are arranged at the same radial distance from the axis of rotation M of the rotary head 1, but at different distances, it is now by a corresponding selection of the distances of the individual electrodes 12 from the rotation axis M of the rotary head 1 possible to arrange the electrodes 12 such that a higher loading of a certain portion of the workpiece W by an electrode by a smaller application of this area causes by the other electrodes and such a A second electrode 12b of the rotary head 12, which has a distance r 2 from the rotation axis M of the rotary head 1, which is smaller than the distance r 1 of the first electrode 12a of the axis of rotation M now rotates due to the small distance to the rotation axis M of the rotary head 1 at a lower line speed than the first electrode 12a, so that it takes a longer time to pass through the inner strip. The second electrode 12b thus acts on the inner strip longer and thus stronger than the first electrode 12a.

Einer dritten Elektrode 12c, die vom Rotationsmittelpunkt des Rotationskopfs 1 einen größeren Abstand r3 aufweist als die ersten beiden Elektroden 12a, 12b, weist eine Bahngeschwindigkeit auf, die deutlich größer ist als diejenigen der ersten beiden Elektroden, so dass sie zur Durchquerung des inneren Streifens eine viel geringere Zeit benötigt als die Elektroden 12a und 12b. Die Beaufschlagung des inneren Streifens ist also deutlich geringer als diejenigen, welche von den Elektroden 12a, 12b bewirkt wird.A third electrode 12c, which has a greater distance r 3 from the center of rotation of the rotary head 1 than the first two electrodes 12a, 12b, has a track speed which is significantly greater than that of the first two electrodes, so that they pass through the inner strip takes much less time than the electrodes 12a and 12b. The application of the inner strip is thus significantly less than that which is caused by the electrodes 12a, 12b.

Durch eine entsprechende Auswahl der Abstände r1, r2, r3 der Elektroden 12 von der Rotationsachse M des Rotationskopfs 1 kann somit in vorteilhafter Art und Weise eine gleichmäßigere Beaufschlagung der Werkstückbahn W erzielt werden, als dies bei radial äquidistant angeordneten Elektroden der Fall ist. Ein weiterer Vorteil einer derartigen Anordnung ist, dass man dann nicht mehr gezwungen ist, den Durchmesser des Rotationskopfs 1 deutlich größer als die Breite der Werkstückbahn zu wählen, um damit eine gleichmäßigere Beaufschlagung derselben zu erzielen.By an appropriate selection of the distances r 1 , r 2 , r 3 of the electrodes 12 from the axis of rotation M of the rotary head 1 can thus be achieved in a beneficial manner a more uniform loading of the workpiece web W, as is the case with radially equidistantly arranged electrodes , Another advantage of such an arrangement is that one is then no longer forced to choose the diameter of the rotary head 1 significantly larger than the width of the workpiece web, in order to achieve a more uniform loading of the same.

Bei dem in Figuren 2 und 3 gezeigten Ausführungsbeispiel ist vorgesehen, dass das Grundelement 10 aus zwei Halbbögen 10a, 10b besteht, an denen jeweils die Elektroden 12 angeordnet sind. Eine derartige Gestaltung besitzt den Vorteil, dass ein derartiges Grundelement 10 leicht aus einer runden Platte, insbesondere einer Metallplatte hergestellt werden kann, indem, insbesondere aus Gründen der Gewichtsersparnis, diejenigen Bereiche der runden Metallplatte, die nicht zur Anbringung von Elektroden 12 benötigt werden, herausgetrennt werden.At the in Figures 2 and 3 shown embodiment, it is provided that the base member 10 consists of two semi-arcs 10a, 10b, on each of which the electrodes 12 are arranged. Such a configuration has the advantage that such a basic element 10 can be easily produced from a round plate, in particular a metal plate, by, in particular for reasons of weight saving, those areas of the round metal plate, which are not required for the attachment of electrodes 12, separated out become.

Ein derartiger Aufbau ist aber nicht zwingend erforderlich, wie das in Figur 4 dargestellte zweite Ausführungsbeispiel zeigt. Das Grundelement 10 ist baumförmig ausgestaltet. Es weist eine Anzahl von radialen Streben 22 auf, an denen die Elektroden 12 angeordnet sind.Such a structure is not absolutely necessary, as in FIG. 4 illustrated second embodiment shows. The base element 10 is designed tree-shaped. It has a number of radial struts 22 on which the electrodes 12 are arranged.

Die Figur 5 zeigt nun ein drittes Ausführungsbeispiel eines Rotationskopfs 1, bei dem das Grundelement 10 als eine Vollscheibe ausgebildet ist, an welcher die Elektroden 12 wie vorstehend beschrieben angeordnet sind.The FIG. 5 now shows a third embodiment of a rotary head 1, wherein the base member 10 is formed as a solid disc, on which the electrodes 12 are arranged as described above.

Zusammenfassend ist festzuhalten, dass die beschriebenen Maßnahmen einen Rotationskopf 1 für eine Vorrichtung zur Coronabehandlung, insbesondere zur Coronavorbehandlung, eines Werkstücks geschaffen wird, welcher sich dadurch auszeichnet, dass durch die nicht-äquidistante Anordnung die einzelnen Elektroden 12 zur Rotationsachse M des Rotationskopfs 1 eine gleichmäßigere Beaufschlagung des zu behandelnden Werkstücks W mit der von den Elektroden 12 erzeugten Coronaentladung und somit ein gleichmäßigeres Behandlungsergebnis gegeben ist. Die beschriebenen Maßnahmen bewirken des weiteren, dass es beim Rotationskopf 1 in vorteilhafter Art und Weise nicht mehr nötig ist, dessen Durchmesser - wie es bei den bekannten Rotationsköpfen war - größer als die Breite der zu behandelnden Materialbahn auszubilden, so dass der beschriebene Rotationskopf 1 kompakt baut.In summary, it should be noted that the described measures a rotation head 1 for a device for Corona treatment, especially for Coronavorbehandlung, a workpiece is created, which is characterized in that the non-equidistant arrangement, the individual electrodes 12 to the rotation axis M of the rotary head 1 a more uniform Actuation of the workpiece W to be treated with the corona discharge generated by the electrodes 12 and thus a more uniform treatment result is given. The measures described cause further that it is no longer necessary in the rotary head 1 in an advantageous manner, the diameter - as it was in the known rotary heads - form larger than the width of the material web to be treated, so that the rotary head 1 described compact builds.

Claims (6)

Rotationskopf für eine Vorrichtung zur Coronabehandlung eines Werkstücks, insbesondere einer Kunststoffbahn, der ein Grundelement (10) mit mindestens zwei hochspannungsbeaufschlagbaren Elektroden (12) aufweist, dadurch gekennzeichnet, dass die einzelnen Elektroden (12, 12a, 12b, 12c) in Umfangsrichtung des Rotationskopfs (1) sowie in radialer Richtung zueinander versetzt angeordnet sind.Rotary head for a device for corona treatment of a workpiece, in particular a plastic web, which has a base element (10) with at least two electrodes (12) which can be subjected to high voltage, characterized in that the individual electrodes (12, 12a, 12b, 12c) in the circumferential direction of the rotary head ( 1) and offset from one another in the radial direction. Rotationskopf nach Anspruch 1, dadurch gekennzeichnet, dass die Elektroden (12) paarweise symmetrisch zu einer Rotationsachse (M) des Rotationskopf (1) angeordnet sind.Rotary head according to claim 1, characterized in that the electrodes (12) are arranged in pairs symmetrically to a rotation axis (M) of the rotary head (1). Rotationskopf nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Grundelement (20) des Rotationskopfs (1) zwei Halbbögen (10a, 10b) aufweist, an denen die Elektroden (12) angeordnet sind.Rotary head according to one of the preceding claims, characterized in that the base element (20) of the rotary head (1) has two semi-arcs (10a, 10b) on which the electrodes (12) are arranged. Rotationskopf nach Anspruch 3, dadurch gekennzeichnet, dass das Grundelement (10) eine Anzahl von Streben (22) aufweist, auf denen die Elektroden (12) angeordnet sind.Rotary head according to claim 3, characterized in that the base element (10) comprises a number of struts (22) on which the electrodes (12) are arranged. Rotationskopf nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Grundelement (10) des Rotationskopfs (1) scheibenförmig ausgebildet ist.Rotary head according to one of claims 1 to 3, characterized in that the base element (10) of the rotary head (1) is disc-shaped. Vorrichtung zur Coronabehandlung eines Werkstücks, die zur Erzeugung von Coronaentladungen mindestens einen Rotationskopf (1) mit jeweils mindestens zwei Elektroden (12) aufweist, dadurch gekennzeichnet, dass der oder mindestens einer der Rotationsköpfe (1) gemäß einem der Ansprüche 1 bis 5 ausgebildet ist.Apparatus for corona treatment of a workpiece, which has at least one rotary head (1) with at least two electrodes (12) for generating corona discharges, characterized in that the or at least one of the rotary heads (1) according to one of claims 1 to 5 is formed.
EP11003511.0A 2010-04-30 2011-04-29 Rotation head for a device for corona treatment of surfaces Withdrawn EP2384096A3 (en)

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DE201010018922 DE102010018922B4 (en) 2010-04-30 2010-04-30 Rotary head for a corona surface treatment device
DE201020006266 DE202010006266U1 (en) 2010-04-30 2010-04-30 Rotary head for a corona surface treatment device

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9831070B1 (en) 2017-06-15 2017-11-28 Enercon Industries Corporation Surface treater with expansion electrode arrangement
EP3435745A1 (en) * 2017-07-27 2019-01-30 FGM Fritz Gradert Maschinenbau GmbH + Co. KG Electrode for treating surfaces

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JP2008021543A (en) 2006-07-13 2008-01-31 Kasuga Electric Works Ltd Corona surface treatment device

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JPH0721546Y2 (en) * 1991-06-07 1995-05-17 春日電機株式会社 Corona discharge treatment device

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US3555378A (en) 1967-05-15 1971-01-12 Commw Of Australia Charging xerographic images
DE10323777A1 (en) 2002-05-29 2003-12-18 Visteon Global Tech Inc Corona device with two electrodes and for the surface treatment of throttle bodies made of plastic
JP2008021543A (en) 2006-07-13 2008-01-31 Kasuga Electric Works Ltd Corona surface treatment device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9831070B1 (en) 2017-06-15 2017-11-28 Enercon Industries Corporation Surface treater with expansion electrode arrangement
EP3435745A1 (en) * 2017-07-27 2019-01-30 FGM Fritz Gradert Maschinenbau GmbH + Co. KG Electrode for treating surfaces

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