EP1919048B1 - Vorrichtung zur Behandlung der Korona - Google Patents

Vorrichtung zur Behandlung der Korona Download PDF

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Publication number
EP1919048B1
EP1919048B1 EP07020765A EP07020765A EP1919048B1 EP 1919048 B1 EP1919048 B1 EP 1919048B1 EP 07020765 A EP07020765 A EP 07020765A EP 07020765 A EP07020765 A EP 07020765A EP 1919048 B1 EP1919048 B1 EP 1919048B1
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EP
European Patent Office
Prior art keywords
electrode
substrate
electrodes
active
counter electrode
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.)
Not-in-force
Application number
EP07020765A
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English (en)
French (fr)
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EP1919048A1 (de
Inventor
Diego Benelli
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.)
Corona System Group Srl
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Corona System Group Srl
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Publication date
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Publication of EP1919048A1 publication Critical patent/EP1919048A1/de
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Publication of EP1919048B1 publication Critical patent/EP1919048B1/de
Not-in-force legal-status Critical Current
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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 the corona treatment technique.
  • the corona treatment basically consists in applying an high intensity electric discharge to the surface of a certain substrate, in order to increase the active tension and consequently to improve the fixing power of printing inks, stickers or coatings.
  • the substrate can be either a film or an extruded item, sheets or plates, wires, tubes, metal plates etc.
  • the corona treatment is widely used to increase the wettability of plastic, metal or paper films, and to help the adhesion of inks, stickers, lacquers... ; it is often used for polyethylene, polypropylene, PVC or polyester films, but it is suitable for almost any plastic material and also for some non-plastic materials such as paper and aluminium.
  • a corona treater basically comprises a high frequency generator, a step-up transformer connected with one or more metal electrodes, and a roll (or a sheet) electrically connected to the ground and acting as a counter electrode. Said roll can be coated with insulating material (silicon, ceramic or others).
  • the substrate is inserted between the electrodes and the roll, with known dragging means. This way, the surface of the substrate is activated by the electric discharge generated between the electrodes in tension and the roll connected to the ground.
  • Machines can be devised to work on their own or connected to another unit, for example an extruder, a flexo printer, a rotogravure, a coupling machines, a sheets production line, etc.
  • the substrate comprises a sheet or an extruded 10 mm thick; the air gap should be 1,5 mm, and the dielectric roll covering is usually 3 mm thick.
  • the total distance between the electrodes and the conductive part of the roll is more or less 15 mm, and considering an average dielectric rigidity of a substrate of 2.000 V/mm, the resulting trigger tension is equal to 30.000 V. So high tensions can be a problem for safety and can damage and/or burn some materials. Moreover, such tensions require a proper design of the insulation and protection means of the device, which cause overall dimensions of the machine.
  • the surface to treat is basically a narrow band along the external surface of the tube, and so the prior art turns out to be not really suitable.
  • the corona treatment device disclosed in EP-A-1047165 is of the type wherein the active electrode is arranged opposite the counter-electrode, said active electrode including high voltage conductor in the portion facing said counter electrode.
  • the object of the invention is to overcome all these problems.
  • the scope of the invention is to reduce the tension necessary for the trigger of the discharge and to direct it towards the substrate, without the use of a forced air flow even if the electrode and the counter electrode are one beside the other, as in the prior art.
  • a further aim of the invention is to treat more easily the sides of tubes or other curved surfaces, as well as complex three-dimensional objects surfaces.
  • the inner volume created by the tubular body is not filled with conductive material, since the only conductive part is said internal coating layer. Typically, the interior is filled with air.
  • the invention enable to avoid the use of rolls or plates connected to the ground, due to the fact that the electrodes are placed on the same side of the substrate (i.e. next to it, or over it), and to the fact that the electric discharge is produced directly between the active and passive electrode/s.
  • the discharge does not have to pass through neither the whole layer of the substrate, nor the insulating layer of the roll. It follows that the trigging tension required is much lower than with the method in which electrode and counter electrode are on opposite parts of the substrate, with the same effect.
  • the described structure of the electrode with hollow interior and lined with conductive material only in the inner part near the substrate produces an arch discharge projecting towards the substrate instead of concentrating in the space between the sides of the electrodes, as in the known systems shown in Fig. 1 e) .
  • the invention relates to a method for the corona effect treatment on a surface S, or part of it, of a substrate, such as an extruded, a tube or a sheet of material.
  • the treatment is the effect of the electric discharge E generated between at least an active electrode 10 and a corresponding passive electrode (or counter electrode) 11, which are placed one beside the other and on the same part, with respect to the substrate, i.e. over it or near it.
  • the active electrode 10, as shown in the scheme, has a connection AT to a generator and possibly to a tension raiser transformer; the passive electrode 11 has an ground connection G.
  • Active electrode 10 comprises a ceramic bar or tube with hallow interior and a side 12 towards substrate S, lined with a conductive layer 14 connected to high tension AT.
  • Said conductive layer is preferably made of metal or even more preferably of silver.
  • the counter electrode or passive electrode 11 has the same structure as electrode 10, with a face 13 likewise towards substrate S and lined with a conductive layer 14.
  • Internal volume 15 of the electrode 10 is filled with air; internal volume 16 of the counter electrode 11 is likewise filled with air.
  • Electric discharge E is generated between the metallic side 12 of the active electrode 10 and the metallic side 13, placed next to it, of the counter electrode 11, hitting surface S of the substrate.
  • the electric discharge E tends to produce an arch projecting towards the underlying surface S of the substrate, instead of generating useless sparks between the sides of the electrodes as it could happen, for example, if there were any conductive material in interiors 15 and 16 of the electrodes.
  • the method provided by the invention enables a strict control of the discharges and, thanks to the proper placing of the electrodes with respect to the plane on which the substrate slides, allows to direct electricity towards the substrate to treat instead of dispersing it in spaces useless for the corona treatment, such as the sides of the electrodes.
  • Fig. 2 shows the position of electrodes 10 and 11 to treat the side of a tube: electrodes 10 and 11 are placed next to the tube and immediately close to its external surface S, preferably with sides 12 and 13 perpendicular to the radial direction defined by the tube.
  • electrodes are in odd number, the external ones are connected to the ground. Thanks to this, the protective casing of the machine can be placed closer to the external electrodes, since these ones are not in tension (i.e. live).
  • Fig. 3 discloses an active electrode 10 and two external electrodes connected to the ground 11A, 11 B.
  • each active electrode discharges towards at least one passive electrode.
  • a reversed disposition can be used, instead of that shown in Fig. 3 , with the passive electrode in the middle and two active electrodes on the sides.
  • the electrodes disposition in Fig. 3 is suitable to treat surfaces of plane sheets, extruded or plates or the like, which are carried continuously and by known means, sliding underneath the electrodes.
  • the treatment can be equally carried out with a steady substrate and a mobile electrode moved to treat the whole required surface. More in detail, another version (not showed) implies the connection of the active and passive electrodes to a manual or automatic moving system (mobile electrodes), to work on a steady substrate or even on plane surfaces of three-dimensional objects.
  • the treatment of objects' surfaces, as known, is possible if said surfaces are physically reachable by the electrodes, considering the electrodes' dimensions and shapes and the limited corona discharge action field (usually 2-3 mm).
  • Fig. 4 shows the preferred shape of the electrode, referring indifferently to an active or a passive electrode, having face 12 or 13, towards the substrate, coated inside with an electricity conductive layer (14).
  • electrodes can have a transversal section different from the basically square section of Figs. 2-4 .
  • the electrodes can have a trapezoidal section, preferably with the smaller side facing the substrate, or a polygonal section, having one or more internal sides lined with conductive material, or even a circular section, part of which is lined with conductive material.
  • the insulating material of the electrodes can be different from the mentioned ceramic; and the conductive material of the covering layer 14 can be different from the mentioned silver. Said materials being described as preferred.
  • Fig. 5 shows a scheme with counter electrode 20 composed by a metallic T beam
  • Fig. 6 shows an even cheaper version in which the counter electrode is simply a metal wire 21 connected to the ground.
  • the invention is suitable for treating both plastic and non-plastic materials, such as paper and aluminium, and can be used with known types of devices for corona treatment.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)

Claims (12)

  1. Vorrichtung zur Coronabehandlung eines Substrates (S), umfassend mindestens eine aktive Elektrode (10) und mindestens eine Gegenelektrode (11, 20, 21), die neben besagter aktiven Elektrode (10) positioniert und mit der Erde verbunden ist,
    - wobei besagte aktive und Gegenelektroden an der gleichen Seite in Bezug auf besagtes Substrat (S) positioniert sind, dadurch gekennzeichnet, dass
    - besagte aktive Elektrode (10) durch einen Hohlkörper gebildet wird, der im Wesentlichen eine röhrenförmig verlängerte Form aufweist und aus Isoliermaterial besteht,
    - die Seitenfläche (12) der dem Substrat (S) zugewandten besagten aktiven Elektrode (10) innen mit einer elektrizitätsleitenden Schicht (14) beschichtet ist,
    - die verbleibenden Seitenflächen der besagten aktiven Elektrode (10) kein leitfähiges Material aufweisen.
  2. Vorrichtung gemäß Anspruch 1, dadurch gekennzeichnet, dass besagte Gegenelektrode (20, 21) aus elektrisch leitfähigem Material besteht.
  3. Vorrichtung gemäß Anspruch 1, dadurch gekennzeichnet, dass besagte Gegenelektrode (11) aus einem Hohlkörper gebildet wird, der im Wesentlichen eine röhrenförmig verlängerte Form aufweist und aus Isoliermaterial besteht, wobei die Seitenfläche (13) der dem Substrat (S) zugewandten besagten Gegenelektrode(11) innen mit einer elektrizitätsleitenden Schicht (14) beschichtet ist und die verbleibenden Seitenflächen der besagten Gegenelektrode (11) kein leitfähiges Material aufweisen.
  4. Vorrichtung gemäß Anspruch 3, dadurch gekennzeichnet, dass besagte hohle Elektrode (10, 11) aus Keramik besteht.
  5. Vorrichtung gemäß Anspruch 4, dadurch gekennzeichnet, dass besagte leitende Schicht (14) aus Metall besteht.
  6. Vorrichtung gemäß Anspruch 5, dadurch gekennzeichnet, dass besagte leitende Schicht (14) aus Silber besteht.
  7. Vorrichtung gemäß Anspruch 1 oder 3, dadurch gekennzeichnet, dass besagte hohle Elektrode (10, 11) einen Stab mit polygonalem Querschnitt umfasst, wobei besagter Querschnitt eine dem Substrat (S) zugewandte Seite (12, 13) aufweist und mit besagter leitenden Schicht (14) gefluchtet ist.
  8. Vorrichtung gemäß Anspruch 7, dadurch gekennzeichnet, dass der Elektrodenstab einen quadratischen oder trapezförmigen Querschnitt aufweist, dessen kleinere Seite dem Substrat zugewandt ist.
  9. Vorrichtung gemäß einem jeden der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass viele aktive Elektroden (10) und passive Elektroden (11, 20, 21) eingeplant sind.
  10. Vorrichtung gemäß Anspruch 9, dadurch gekennzeichnet, dass sich besagte Elektroden nebeneinander und abwechselnd auf der gleichen Fläche befinden, so dass viele elektrische Entladungen zwischen jeder aktiven Elektrode (10) und mindestens einer passiven Elektrode zur Behandlung von ebenen Folien, Extrudiertem, Platten und Ähnlichem erzeugt werden können.
  11. Vorrichtung gemäß Anspruch 10, dadurch gekennzeichnet, dass die Elektroden in ungerader Anzahl vorhanden sind und die beiden Außenelektroden (11A, 11B) passiv sind, das heißt mit der Erde verbunden.
  12. Vorrichtung gemäß einem jeden der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Elektroden mit einem manuellen oder automatischen beweglichen System zur Behandlung eines festen Substrates oder ebener Flächen von Gegenständen verbunden sind.
EP07020765A 2006-11-03 2007-10-24 Vorrichtung zur Behandlung der Korona Not-in-force EP1919048B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000022A ITCR20060022A1 (it) 2006-11-03 2006-11-03 Metodo e apparecchio per trattamento corona

Publications (2)

Publication Number Publication Date
EP1919048A1 EP1919048A1 (de) 2008-05-07
EP1919048B1 true EP1919048B1 (de) 2011-06-08

Family

ID=38973637

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07020765A Not-in-force EP1919048B1 (de) 2006-11-03 2007-10-24 Vorrichtung zur Behandlung der Korona

Country Status (3)

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EP (1) EP1919048B1 (de)
AT (1) ATE512491T1 (de)
IT (1) ITCR20060022A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2866318A1 (de) 2013-10-24 2015-04-29 OCE-Technologies B.V. Elektrode zur Behandlung eines Substrat mit dielektrischer Barriereentladung
WO2017036849A1 (en) * 2015-09-01 2017-03-09 Oce-Technologies B.V. Plasma treatment system for cut sheet media

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1100414A (en) * 1964-05-19 1968-01-24 Ici Ltd Treatment of plastics surfaces with an electrical discharge to improve their bonding properties
ATE214521T1 (de) * 1999-04-21 2002-03-15 Softal Elektronik Gmbh Barrierenelektrode zur oberflächenbehandlung von elektrisch leitenden oder nichtleitenden materialien sowie anordnung derartiger barrierenelektroden

Also Published As

Publication number Publication date
EP1919048A1 (de) 2008-05-07
ITCR20060022A1 (it) 2008-05-04
ATE512491T1 (de) 2011-06-15

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