EP2280459B1 - A device for supporting electrodes of corona treatment machines - Google Patents

A device for supporting electrodes of corona treatment machines Download PDF

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Publication number
EP2280459B1
EP2280459B1 EP10170971A EP10170971A EP2280459B1 EP 2280459 B1 EP2280459 B1 EP 2280459B1 EP 10170971 A EP10170971 A EP 10170971A EP 10170971 A EP10170971 A EP 10170971A EP 2280459 B1 EP2280459 B1 EP 2280459B1
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EP
European Patent Office
Prior art keywords
electrodes
supporting device
pins
bridge
supporting
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EP10170971A
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German (de)
English (en)
French (fr)
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EP2280459A1 (en
Inventor
Diego Benelli
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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 present invention is aimed at the sector of production of machines for carrying out surface treatments on various materials: in particular, the invention regards a device for supporting electrodes that can be used with machines for carrying out corona treatment.
  • corona treatment in general consists in applying an electrical discharge of considerable intensity to the surface of a given substrate, which may be constituted by a film or an extrusion, or else by sheets, plates, cables, pipes, sheet metal, etc., with the purpose of increasing the active tension thereof and hence improving the capacity of anchorage of printing inks, adhesives, or coatings.
  • Corona treatment is frequently applied to polyethylene, polypropylene, PVC, or polyester films but more in general can be used for all plastic materials and also some non-plastic materials, such as paper and aluminium.
  • a machine for carrying out corona treatments (with electrodes coated with insulating material), according to the known art, is basically constituted by a high-frequency generator, by a voltage-booster transformer connected to a plurality of electrodes coated with insulating material, and by a counter-electrode, made of conductive material and electrically connected to ground.
  • the substrate to be treated is made to pass in the space that is created between the electrodes and the counter-electrode, with known conveying means: in this way, the surface of the substrate is activated by the electrical discharge that is struck between the electrodes to which the voltage is applied and the counter-electrode connected to ground.
  • the electrodes are generally arranged alongside one another, anchored to a given supporting device, set opposite to the surface for sliding of the substrate.
  • Electrodes are constituted by a pipe or by a ceramic rod, or other equally insulating material, generally with square or round hollow section, with conductor material inside.
  • the electrodes made of insulating material obtained by extrusion have dimensional and geometrical tolerances that are difficult to contain within minimum or negligible ranges: in order to support up to 4-5 electrodes, it is possible to grip the electrodes using an elastic insulating supporting device (of a comb type), which exerts via a tie rod and two insulating rigid plates a closing force on the comb, so as to pack the electrodes together.
  • This system enables a controlled distance between the electrodes and the counter-electrode (air-gap) to be obtained. For a large number of electrodes, there is likely to remain the problem of a non-correct positioning of the electrodes themselves so that the air-gap is rendered irregular.
  • the teeth of the comb are kept wide open, and the lateral electrodes disadvantageously tend to recede from the counter-electrode. If, instead, the size of the cross section of the electrodes is at the minimum of the tolerance, the teeth of the comb close, and the lateral electrodes disadvantageously tend to approach the counter-electrode. In either case, the air-gap is never constant and precise, thus favouring onset of anomalous discharges towards the centre or the periphery of the treatment arc.
  • the comb requires teeth of small dimensions in order to be easily deformable, and consequently the electrodes are arranged set alongside one another in a very close way: the electrical discharges, thus concentrated, tend to overheat the machine.
  • WO 02/19486 A1 discloses a device for supporting electrodes in corona treatment machines comprising a bridge made of an insulating material suitable for supporting, by use of separating means, ceramic electrodes that interact with a counter electrode on which a substrate to be treated slides, according to the preamble of the independent claim 1.
  • the purpose of the invention is to overcome the residual drawbacks mentioned above.
  • the main purpose of the invention is to obtain, between the electrodes coated with insulating material and the counter-electrode, a precise and constant air-gap, also with a high number of the electrodes themselves, which is necessary for successful corona treatment and proper striking of the electrical discharge.
  • a further purpose of the invention is to enable the use of a higher number of electrodes for each hood (container for the electrodes with suction of the ozone produced by the process) by setting them at a distance to enable a good cooling thereof and consequently a greater concentration of discharge, with consequent increase of speed on each individual hood and reduction of the costs.
  • a device for supporting electrodes of corona treatment machines comprising a bridge made of insulating material arranged for supporting, by interference with separating means ceramic, electrodes that interact with a counter-electrode on which a substrate to be treated slides, the device being characterized in that said separating means comprise teeth and pins interposed between pairs of electrodes, wherein said pins comprise a threaded cylindrical portion and a smooth conical portion so as to generate a divaricating force between said pairs of electrodes directed towards said teeth.
  • said separator means comprise also fins on which said pins act.
  • said cylindrical portion co-operates with holes provided on the bridge, and said conical portion acts either directly or indirectly on the lateral faces of the electrodes.
  • pins to be screwed into holes provided on the bridge by means of insertion from the side of the counter-electrode or from the opposite side thereof.
  • said threaded cylindrical portion of the pins co-operates with a bushing associated to said bridge.
  • the invention regards a supporting device 1 for electrodes to be used in machines for corona treatment of a surface or surface portion of a substrate S.
  • Said supporting device 1 comprises a bridge 2 made of insulating material, for example plastic material such as teflon, designed to support a plurality electrodes E interacting with a cylindrical counter-electrode 3, for striking electrical discharges necessary for the corona treatment.
  • insulating material for example plastic material such as teflon
  • Said electrodes E are connected to a generator and to a voltage-booster transformer according to the known art, whereas the counter-electrode is connected to ground.
  • the electrodes E are each constituted by a rod of insulating material, with a trapezoidal cross section, hollow inside and with the smaller base facing the substrate S to be treated, with conductor material connected to the high voltage therein.
  • the counter-electrode 3 made of conductive material, can have a cylindrical shape as illustrated in Figures 1, 2 and 5 or a substantially plane shape, as illustrated in Figure 4 , and on its outer surface the substrate S advances, appropriately arranged so as to slide in the air-gap existing between the electrodes E and the counter-electrode 3.
  • the electrodes E set alongside one another above the substrate S, are arranged in such a way that the air-gap is well calibrated, i.e., in such a way that their surface facing the counter-electrode 3 reproduces the curvature of the cylinder constituting the counter-electrode itself, i.e., is concentric thereto, or else provides a plane surface parallel to that of the counter-electrode, in the case where the latter is of a plane type.
  • Said electrodes E are supported by a bridge 2, by interference with suitable separator means, constituted in particular by teeth 4 and pins 5 set between pairs of electrodes E.
  • said pins 5 comprise a threaded cylindrical portion 5', arranged for co-operating with holes 7 provided on the bridge 2, and a smooth conical portion 5", which acts directly on first lateral faces 8' of the trapezoidal electrodes E, so as to keep them in position, generating a force of divarication of said pairs of electrodes, which pushes second lateral faces 8" of the electrodes themselves to rest against corresponding plane shoulders constituted by the lateral surfaces of the teeth 4.
  • said pins 5 can be screwed into the threaded holes 7, provided on the bridge 2, with insertion from the side opposite to the counter-electrode 3.
  • Figures 2-4 illustrate a possible variant embodiment of the supporting device 1 of Figure 1 , in which the separator means, provided on the bridge 2, furtherly comprise fins 6 on which the pins 5 act, in such a way that the conical portion 5" of the pin 5 will exert a more extensive pressure on the electrode E, using all the surface area of the fin 6 itself, and not only the segment of tangency between the electrode E and the conical portion 5", as occurs instead in the first variant.
  • the pins 5 can be screwed into the holes 7 provided on the bridge 2, with insertion from the side of the counter-electrode 3.
  • the cylindrical portion 5' of the pins 5 co-operates with a bushing 9 that can be stably associated to the bridge 2, according to a known technique, and is made of a material harder and more resistant than the teflon of which only the bridge 2 is made.
  • Said bushing 9 is purposely provided with a thread arranged for co-operating with the corresponding thread of the cylindrical portion 5' of the pin 5 so as to ensure a fit with higher mechanical resistance.
  • Figure 5 shows the conformation of an accessory component 100 of the device for supporting electrodes, which can be used as first and last bridging lateral support to be positioned beyond the outer edge of the surface to be treated S and of the counter-electrode 3.
  • the case represented applies for to a roller counter-electrode 3, but a similar component is provided for a plane counter-electrode.
  • the bridging supports 100 are provided with shaped gaps having the same shape as the cross section of the electrodes and, if the cross section is trapezoidal as in the case illustrated, the minor bases of the trapezia are arranged according to a surface that reproduces that of the counter-electrode 3 increased by the thickness of the substrate to be treated and of the air-gap.
  • Fixing of the electrodes E in said gaps occurs by means of threaded cylindrical pins 5, which can be inserted in holes 7 on the opposite side with respect to the counter-electrode 3 and press the electrodes E against the minor bases of said gaps.
  • the arrangement with which the electrodes E can be fixed on the bridge 100 cannot be modified with adjustments, but reproduces exactly the form of the surface of the counter-electrode 3 so that it can constitute a fixed reference for the intermediate bridging supports 2.
  • the preferred embodiment of the electrodes E is substantially trapezoidal with the smaller base facing the substrate S; the insulating material of which said electrodes E are made is prevalently ceramic.
  • the electrodes can have a cross section different from the substantially trapezoidal cross section: by way of example, the electrodes can have a square, or else polygonal, cross section, provided that said cross section co-operates in a correct and advantageous way with the conical portion of the pins.
  • the invention may be applied to substrates to be treated, whether plastic or non-plastic, such as paper and aluminium, and to the various known types of corona treatment machines.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
  • Polarising Elements (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Electrostatic Separation (AREA)
EP10170971A 2009-07-29 2010-07-27 A device for supporting electrodes of corona treatment machines Active EP2280459B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITCR2009A000030A IT1394976B1 (it) 2009-07-29 2009-07-29 Dispositivo di supporto per elettrodi di macchine per trattamento corona

Publications (2)

Publication Number Publication Date
EP2280459A1 EP2280459A1 (en) 2011-02-02
EP2280459B1 true EP2280459B1 (en) 2012-03-14

Family

ID=42076241

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10170971A Active EP2280459B1 (en) 2009-07-29 2010-07-27 A device for supporting electrodes of corona treatment machines

Country Status (5)

Country Link
EP (1) EP2280459B1 (it)
AT (1) ATE549779T1 (it)
DK (1) DK2280459T3 (it)
ES (1) ES2383294T3 (it)
IT (1) IT1394976B1 (it)

Families Citing this family (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
CN108398114B (zh) * 2018-02-12 2020-09-18 武汉华星光电半导体显示技术有限公司 曲面盖板边缘曲率测量装置、测量系统及测量方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10042173A1 (de) * 2000-08-28 2002-03-14 Afs Entwicklungs & Vertriebs G Vorrichtung zur Coronabehandlung und Schwenkhalterung für eine Elektrode

Also Published As

Publication number Publication date
EP2280459A1 (en) 2011-02-02
DK2280459T3 (da) 2012-05-29
ATE549779T1 (de) 2012-03-15
ES2383294T3 (es) 2012-06-20
IT1394976B1 (it) 2012-08-07
ITCR20090030A1 (it) 2011-01-30

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