EP2211434B1 - Verfahren und Vorrichtung zur Coronabehandlung - Google Patents

Verfahren und Vorrichtung zur Coronabehandlung Download PDF

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Publication number
EP2211434B1
EP2211434B1 EP09179069A EP09179069A EP2211434B1 EP 2211434 B1 EP2211434 B1 EP 2211434B1 EP 09179069 A EP09179069 A EP 09179069A EP 09179069 A EP09179069 A EP 09179069A EP 2211434 B1 EP2211434 B1 EP 2211434B1
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EP
European Patent Office
Prior art keywords
electrodes
voltage
treatment
curves
actual
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
EP09179069A
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German (de)
English (en)
French (fr)
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EP2211434A1 (de
Inventor
Gerhard Arlt
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.)
Afs Entwicklungs & Vertriebs GmbH
AFS ENTWICKLUNGS and VERTRIEBS GmbH
Original Assignee
Afs Entwicklungs & Vertriebs GmbH
AFS ENTWICKLUNGS and VERTRIEBS GmbH
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Publication of EP2211434A1 publication Critical patent/EP2211434A1/de
Application granted granted Critical
Publication of EP2211434B1 publication Critical patent/EP2211434B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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 a method for corona treatment according to the preamble of claim 1 and a device for corona treatment according to the preamble of claim 11.
  • a known device for corona treatment of plastic films discloses the EP 1 316 130 B1 , There, a web-like material is passed in an approximately 2 mm wide treatment gap between a rapidly rotating roller and an electrode assembly. The roll is metallically bare or coated with a dielectric material and is encompassed halfway around its circumference by the electrode assembly. The electrode assembly is energized with a high frequency high voltage to produce a corona treatment in the treatment gap. As a result, the surface of the plastic film is pretreated for subsequent processing.
  • a corona treatment apparatus having a treatment station for corona treating continuous web materials.
  • the treatment station and two therein, in the transport direction of the web material successively arranged electrodes are connected via a high voltage cable to a voltage generator, which in turn is connected via a transformer to the electrical line network.
  • a voltage generator which in turn is connected via a transformer to the electrical line network.
  • this has a synchronization circuit, which performs a frequency adjustment between the voltage at the electrodes, the generator and the transformer.
  • WO2005 / 117057 is a non-generic electrostatic fluid accelerator and a method for controlling a fluid flow out, so no device for Corona treatment of web-like materials.
  • two independent electrode stations are provided, each having a corona discharge electrode and a collector electrode.
  • the electrode stations are each supplied with high voltage from their own voltage generator.
  • the electrode stations of the fluid accelerator do not have a common electrode in the form of a treatment roller for transporting a web-like material. Only a controlled forward operation is possible with the device Dori, a tracking of the voltage waveform at the electrodes actually measured voltage waveforms of the electrodes does not take place there.
  • FIG. 1 Another example of a known corona treatment apparatus shows Fig. 1 , There, a plastic film F is conveyed from a feed roller 1 and a discharge roller 2 via a treatment roller 3 in a transport direction T.
  • the feed roller 1, the Discharge roller 2 and the treatment roller 3 are perpendicular to the plane of the drawing Fig. 1 standing rotary axes mounted rotatably driven.
  • a first, second and third voltage discharge unit 4, 5 and 6 are provided in a conventional manner.
  • the tension discharge units 4, 5 and 6 are arranged in the circumferential direction of the treatment roller 3 and thus in the transport direction T of the film F one behind the other at a small distance from the surface of the treatment roller 3 and substantially over the entire axial width of the treatment roller 3.
  • the discharge unit 4 has a circular arc-shaped high-voltage electrode 41 in the circumferential direction of the treatment roller 3.
  • the electrode 41 has in a known manner the film F facing and at a small distance from the treatment roller 3 and thus film F arranged discharge peaks.
  • the necessary for generating the discharge between the electrode 41 and the treatment roller 3 high-frequency AC voltage is connected via a transformer 42 from a voltage generator 43, z. B. a frequency converter provided.
  • the discharge units 5 and 6 are formed analogously.
  • z. B. web width or transport speed the requirements for the discharge unit are determined.
  • very wide treatment rollers 3 are used up to 11 m axial width. Due to the high transport speeds of the films and their double stretching a very high energy input and thus a large installed power of the voltage generators 43, 53, 63 is required for the corona treatment. Therefore, due to the limited capacity of a single discharge unit, a plurality of discharge units 4, 5 and 6 are arranged one behind the other but which are decoupled from each other and provided with independent activation.
  • electrodes 51 and 61 of the second and third discharge units 5 and 6 are each assigned their own high-voltage transformers 52 and 62 and voltage generators 53 and 63. Although these are usually fed by the same network, the voltage waveforms of the high voltage alternating voltage at the electrodes are independent and unsynchronized, in particular as regards the phase position of the individual high voltage alternating voltages.
  • opposite-phase AC voltages or voltages with opposite-phase AC voltage components abut and thus results in a high differential voltage between the adjacent electrodes.
  • This differential voltage can adversely affect the processing of the film F and lead at worst to a voltage flashover between the electrodes, whereby the film F may be damaged or even completely destroyed.
  • the method mentioned in the introduction is characterized in that the voltage profiles at the electrodes are matched to one another.
  • the voltage profiles at the electrodes are matched to one another.
  • matching is understood above all as an adaptation of the voltage profile in terms of shape, phase and / or clocking in order to be able to keep the voltage differences between the electrodes as small as possible at any time.
  • the voltage generators are controlled so that the voltages at the individual electrodes are in phase with each other.
  • the voltage difference between adjacent electrodes can be made virtually zero by using Sollwoodsverierin for all voltage generators with the same amplitude and phase.
  • SollStacksverierin for all voltage generators with the same amplitude and phase.
  • voltages with DC and AC voltage components are used, since here too the differences in the AC voltage component can cause corresponding voltage differences between the electrodes.
  • the Istnapssverrise one or more of the electrodes can be controlled to a predetermined desired voltage waveform, which is preferably the same for all voltage generators.
  • the Istnapssverlauf one of the electrodes can be used as a target voltage waveform for driving the voltage generators or one or more of the other electrodes.
  • the actual, measured actual voltage curve at one of the electrodes serves as the default for the other electrodes, since the individual electrodes normally behave the same due to their usually identical structure.
  • the electrode whose actual voltage profile is used as the desired voltage profile may be the foremost electrode in the transport direction of the web-like material.
  • the actual voltage characteristics of adjacent electrodes can advantageously be measured in each case at their adjacent ends.
  • An initially mentioned device for corona treatment is inventively characterized in that a synchronization device is provided for the equalization of the voltage characteristics at the electrodes.
  • the synchronization device can be advantageously set up for outputting nominal voltage curves to the voltage generators in order to match the voltage profiles at the electrodes as simply as possible by controlling the voltage generators with a uniform desired voltage profile.
  • already existing systems can be retrofitted in a simple way in which simply the synchronization device is inserted later.
  • sensors for determining the Istschreibsverrise on the one or more electrodes may be provided on one or more of the electrodes, wherein the synchronization device is arranged to receive the Istschreibsverêtn of the electrodes.
  • the synchronization device is advantageously designed to form voltage differences from the desired voltage curves and the actual voltage curves received in order to then generate control signals for the voltage generators on the basis of these voltage differences.
  • Fig. 2 shows a corona treatment device according to the invention, which largely from the known corona treatment device Fig. 1 equivalent. Same parts wear therefore the same reference numerals, and it will be discussed below primarily on the differences.
  • the film F is conveyed in the transport direction T by the feed roller 1, the discharge roller 2 and a rotatably drivable treatment roller 3 '.
  • the discharge units 4, 5 and 6 are arranged.
  • the corona treatment device provides a synchronization device 7 connected to the voltage generators 43, 53 and 63.
  • the synchronization device 7 controls the voltage generators 43, 53, and 63 according to the invention with the same desired voltage voltage curve, so that the voltage waveforms at the voltage electrodes 41, 51 and 61 are the same. If essentially sinusoidal alternating voltages of the same amplitude are used at the voltage electrodes 41, 51 and 61, then the voltage generators 43, 53 and 63 are driven in phase, so that these alternating voltages are in phase.
  • the voltage profiles of all electrodes 41, 51 and 61 are synchronized with each other, so that no voltage differences between electrodes 41 and 61 remote from each other can arise.
  • the synchronization device 7 can also be used for the synchronization of other voltage profiles as alternating voltages of the high voltage applied to the electrodes 41, 51 and 61, for example voltages with DC and AC components or pulsed voltages.
  • the synchronization device 7 can be operated in controlled or regulated operation. In controlled operation, the synchronization device 7 directly supplies the voltage generators 43, 53, and 63 with the clock signals or the phase profiles of the voltage profiles at the electrodes 41, 51 and 61 as nominal voltage characteristics.
  • the Istschreibsverembraced at the electrodes 41, 51 and 61 of the individual discharge units 4, 5 and 6 are detected separately from each other and forwarded to the synchronization device 7.
  • the voltage curves can be determined directly at the electrodes 41, 51 and 61, at the primary or secondary side of the high-voltage transformers 42, 52 and 62 or at the voltage generators 43, 53 and 63.
  • the respective voltage differences are then determined in each case between the measured voltage curves of adjacent discharge units 4 and 5 or 5 and 6 and then the actual Istschreibsverincome the respective adjacent voltage generators 43 and 53 or 53 and 63 aligned with each other so that no or only negligible voltage differences between the adjacent electrodes 41 and 51 or 51 and 61 result.
  • the synchronization device 7 per se known control methods implemented in hardware, software or a combination of both.
  • the actual voltage curve of the electrode 41 of the first forward discharge unit 4 in the transport direction T is measured and used as a setpoint voltage curve for the further electrodes 51 and 61 so that the voltage curve of the subsequent second discharge unit 5 is tracked to the voltage curve of the first discharge unit 4.
  • the voltage curve of the third discharge unit 6 is synchronized to that of the first discharge unit 4.
  • the voltage curve of the third discharge unit 6 is then synchronized to that of the second discharge unit 5.
  • the first discharge unit 4 can be operated either controlled or regulated.
  • the voltage generator 43 of the first discharge unit 4 so either only a desired voltage waveform of the synchronization device 7 is specified (controlled operation), or it is additionally the Istwoodsverlauf on the Electrode 41 measured and regulated to a predetermined by the synchronization device 7 target voltage waveform.
  • the controlled operation can advantageously be ensured that resulting from different behavior of the discharge units 4, 5 and 6 voltage differences can be compensated, which is naturally not possible in controlled operation.
  • the measurement of the voltage profiles takes place at adjacent ends of two adjacent electrodes 41 and 51 and 51 and 61.
  • the voltage at both ends of the central electrode 51 can be measured.
  • the synchronization device 7 may be known per se as independent control, z. B. as a microprocessor control, be formed. It can be made of hardware, software or a combination of both. The synchronization device 7 can also be integrated in the system control of the entire film conveyor system.
  • the connection of the discharge units 4, 5 and 6 with the synchronization device 7 can take place via permanently wired connections, preferably via optical connections such as optical waveguides, in order to be able to synchronize the voltage profiles in the microsecond range.
  • the safety distance d2 between adjacent ends of the individual electrodes 41, 51 and 61 in the circumferential direction of the treatment roller 3 'in the corona treatment device according to the invention Fig. 2 be chosen much smaller than the safety distance d1 in the known corona treatment after Fig.1 ,
  • the diameter D2 of the treatment roller 3 'relative to the treatment roller 3 can be significantly reduced, as from a comparison of Fig. 1 and Fig. 2 evident.
  • the treatment roller 3 'of the corona treatment device according to the invention is therefore smaller and more compact and consequently lighter than the usual treatment roller 3, with the same requirements on the transport speed of the film F.
  • the corona treatment device according to the invention therefore is smaller, consumes less material and is less expensive to produce. Further, this reduces the forces and moments occurring in the rotational operation of the treatment roller 3 ', whereby the bearings and the drive of the treatment roller 3' smaller can be dimensioned. Thus, the installed power and the energy required in operation of the drive of the treatment roller can be reduced.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
EP09179069A 2009-01-24 2009-12-14 Verfahren und Vorrichtung zur Coronabehandlung Not-in-force EP2211434B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009006049A DE102009006049A1 (de) 2009-01-24 2009-01-24 Verfahren und Vorrichtung zur Coronabehandlung

Publications (2)

Publication Number Publication Date
EP2211434A1 EP2211434A1 (de) 2010-07-28
EP2211434B1 true EP2211434B1 (de) 2012-02-15

Family

ID=42103045

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09179069A Not-in-force EP2211434B1 (de) 2009-01-24 2009-12-14 Verfahren und Vorrichtung zur Coronabehandlung

Country Status (4)

Country Link
EP (1) EP2211434B1 (zh)
CN (1) CN101786325B (zh)
AT (1) ATE545975T1 (zh)
DE (1) DE102009006049A1 (zh)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103624972B (zh) * 2012-08-22 2016-08-17 青岛新东洋车辆用品有限公司 塑料膜电晕方法及电晕塑料膜
CN104210227B (zh) * 2013-06-05 2017-12-08 广东隆兴包装实业有限公司 平面印盖机的电晕装置
DE202013009132U1 (de) 2013-10-16 2015-01-19 Afs Entwicklungs + Vertriebs Gmbh Halterung zur Befestigung einer Elektrodengruppe
US9856559B2 (en) 2016-02-05 2018-01-02 Illinois Tool Works Inc. Corona treatment system
DE102017101284A1 (de) 2017-01-24 2018-07-26 SchäferRolls GmbH & Co. KG Zweischichtwalzen

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4695723A (en) * 1985-06-10 1987-09-22 Eastman Kodak Company Corona-charging apparatus
US6007784A (en) * 1997-07-11 1999-12-28 3Dt, Inc. Electric discharge surface treating electrode and system
DE10042173A1 (de) 2000-08-28 2002-03-14 Afs Entwicklungs & Vertriebs G Vorrichtung zur Coronabehandlung und Schwenkhalterung für eine Elektrode
US7053565B2 (en) * 2002-07-03 2006-05-30 Kronos Advanced Technologies, Inc. Electrostatic fluid accelerator for and a method of controlling fluid flow
CN1528500A (zh) * 2003-10-16 2004-09-15 同济大学 聚四氟乙烯驻极体多孔过滤膜的制备方法

Also Published As

Publication number Publication date
CN101786325A (zh) 2010-07-28
CN101786325B (zh) 2013-09-18
DE102009006049A1 (de) 2010-07-29
EP2211434A1 (de) 2010-07-28
ATE545975T1 (de) 2012-03-15

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