EP2730150A1 - Procédé de surveillance de la fiabilité fonctionnelle d'au moins une électrode passive et appareil de surveillance de la fiabilité fonctionnelle d'au moins une électrode passive - Google Patents

Procédé de surveillance de la fiabilité fonctionnelle d'au moins une électrode passive et appareil de surveillance de la fiabilité fonctionnelle d'au moins une électrode passive

Info

Publication number
EP2730150A1
EP2730150A1 EP12743810.9A EP12743810A EP2730150A1 EP 2730150 A1 EP2730150 A1 EP 2730150A1 EP 12743810 A EP12743810 A EP 12743810A EP 2730150 A1 EP2730150 A1 EP 2730150A1
Authority
EP
European Patent Office
Prior art keywords
electrode
measuring
passive electrode
passive
operational reliability
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.)
Withdrawn
Application number
EP12743810.9A
Other languages
German (de)
English (en)
Inventor
Joachim HISAM
Udo Schmidt
Thomas Vinnay
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.)
Illinois Tool Works Inc
Original Assignee
Illinois Tool Works Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Illinois Tool Works Inc filed Critical Illinois Tool Works Inc
Publication of EP2730150A1 publication Critical patent/EP2730150A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
    • H05F3/00—Carrying-off electrostatic charges
    • H05F3/02—Carrying-off electrostatic charges by means of earthing connections

Definitions

  • the present invention relates to a method and an apparatus for monitoring the operational reliability of at least one passive electrode for the purpose of neutralizing surface charges, in particular charges on sheet materials, along an ionization region formed between the at least one passive electrode and the surface charges .
  • Such a procedure is particularly advisable when the aim is to produce an adhering force, determined by the guantity of the surface charges, of the various sheet layers, or else when, in order to prepare an electrostatically supported printing process, the sheet surfaces of a paper sheet, for example, are to be appropriately prepared .
  • active discharge electrodes are favored for use in current technology, since it is relatively easy to monitor the ionization current they discharge.
  • Such a current flowing via the ionization path deliberately brought about serves here as an indicator that the functionality of the active discharge electrode is ensured.
  • the ionization path absolutely necessary for discharging the surface charges is not formed, from which it can then be concluded that the functionality of the active discharge electrode is not ensured.
  • passive discharge electrodes which are not based on the active principle of an actively and artificially formed ionization path.
  • passive discharge electrodes are mostly bodies shaped in cord-like or wire-like fashion, for example cords with carbon fibers, grounding tongues, brushes or so-called tinsle bars.
  • These passive discharge electrodes are arranged at a short distance from the material sheet surface or material surface to be discharged, and connected to a reference or ground potential.
  • passive discharge electrodes have the disadvantage of not ensuring a simple function monitoring, that is to say a monitoring which enables the electrode to discharge charges.
  • the distance between the individual discharge tips of the individual elements of such a passive discharge electrode can influence the formation of the described electric field during operation, and thus reduce the discharging performance.
  • this object is achieved by virtue of the fact that at least one measuring electrode is provided for applying a measuring electric field strength to the ionization region formed between the at least one passive electrode and the surface charges, the at least one passive electrode being connected via a current measurement device to a reference potential, and the method providing that a measurement voltage is applied to the at least one measuring electrode, that a current flow is detected by means of the current measurement device, that the detection result is compared with a reference value, and that the operational reliability is assessed with the aid of this comparison.
  • the inventive solution has an entire series of important advantages over the known methods for neutralizing surface charges by means of passive charge electrodes.
  • the inventive method can be used for reliable monitoring of the operational reliability not only for active discharge systems, but also for passive discharge electrodes. Because the voltage for generating the measuring electric field strength along the ionization region is small in relation to an ionization voltage for comparable active discharge systems, protection against explosion, in particular, continues to be ensured during use in potentially explosive environments. Furthermore, shock protection, and thus personal protection, are effectively ensured by the low level of this measurement voltage .
  • detecting the current flow includes measuring the current strength.
  • the reference value constitutes a reference current strength
  • the detected current flow that is to say the measured current strength
  • a continuous measurement voltage can be continuously assessed whether the at least one passive discharge electrode is still capable in principle of removing surface charges from the material sheet or the other type of material. This is advantageous, in particular, when the number of surface discharges on the material sheet fluctuates over time. Even when there are absolutely no surface charges present on the material sheet at a specific instant, the low ionization by means of the measurement voltage ensures, nevertheless, that a minimum ionization current always flows in the ionization region and indicates the basic functionality of the passive discharge electrode. By contrast with active discharge systems, however, it is possible here to use substantially lower voltages.
  • pulsed measuring electrode instead of the continuous measurement voltage to the at least one measuring electrode.
  • pulsed comprises uniform pulses as well as sporadic switching on and off of the measurement voltage.
  • the at least one passive electrode and the at least one measuring electrode are designed as a common electrode.
  • the passive electrode in this case simultaneously takes over the function of the measuring electrode, and this enables a particularly simple design.
  • a voltage source is then provided directly between the at least one passive electrode and the current measurement device.
  • the low internal resistance of the voltage source always ensures that the surface charges flow off through the current measurement device in the direction of the reference potential.
  • the minimum measurement voltage which is adeguate for ionization, however, simultaneously ensures that a minimum ionization current always flows and that the functionality of the at least one passive electrode can thereby be monitored at any time .
  • the at least one passive electrode and the at least one measuring electrode are designed as separate electrodes.
  • the at least one measuring electrode is arranged at a spacing from the at least one passive electrode along the ionization region. This ensures that the measurement current flows from one electrode to the opposite electrode over an ionized path in each case. It is possible hereby to ensure that the interspace between the electrodes can be ionized in each case. In particular, this excludes the current flow detected by means of the current measurement device from, for example, taking place via a conductive contamination on the electrode housing of the at least one passive electrode.
  • an additional warning device can be provided, the method then additionally providing that a warning signal is output by means of the warning device when the assessment is that operational reliability is lacking.
  • a warning signal is output by means of the warning device when the assessment is that operational reliability is lacking.
  • an apparatus for carrying out the inventive method, the apparatus having at least one passive electrode for the purpose of neutralizing surface charges along an ionization region formed between the at least one passive electrode and the surface charges, at least one measuring electrode for applying a measuring electric field strength to the ionization region, a current measurement device via which the at least one passive electrode is connected to a reference potential, in particular ground potential, and at least one voltage source for applying a measurement voltage to the at least one measuring electrode.
  • Such an inventive apparatus enables effective and reliable monitoring of the operational reliability of the passive electrode for the purpose of neutralizing surface charges .
  • figure 1 shows a schematic sectional view of a first exemplary embodiment of an apparatus for carrying out the inventive method, the passive electrode and the measuring electrode being of common design
  • figure 2 shows a schematic sectional view of a second exemplary embodiment of an apparatus for carrying out the inventive method in a way similar to figure 1, although the passive electrode and the measuring electrode are of separate design.
  • Figure 1 shows a schematic sectional view of a first exemplary embodiment of an apparatus for carrying out the inventive method.
  • a multiplicity of passive electrodes 110 Arranged on an electrode housing 100 is a multiplicity of passive electrodes 110 that extend in the direction of a sheet material 140 that is to be discharged and carries surface charges.
  • the individual passive electrodes 110 in this case simultaneously constitute measuring electrodes 120 and, at their end on the housing side, are interconnected and connected as a whole to the positive pole of a voltage source 135 designed to be of low resistance.
  • the negative pole of the voltage source 135 is, in turn, connected to a current measurement device 130 which, for its part, ensures contact with a reference potential 132.
  • the current measurement device 130 includes a measuring shunt 131 and is designed to output a measured value of the current strength 134 for the purpose of comparison and assessment to an assessment device (not illustrated) .
  • the measurement voltage 136 output by means of the voltage source 135 to the multiplicity of measuring electrodes 120 ensures that a minimum ionization of the ionization region 150 between the sheet material and the electrodes 110 or 120 is always maintained. At the same time, the measurement voltage 136 of the voltage source 135 is so low that shock protection of the measuring electrodes 120 is ensured at any time. At the same time, the measurement voltage 136 is intrinsically safe, that is to say is not adeguately high in potentially explosive regions to ignite the solvent/air mixture .
  • FIG. 2 shows a second exemplary embodiment of an apparatus for carrying out the inventive method, in this case a measuring electrode 120 being designed separately from the passive electrodes 110, and being arranged at a spacing from the passive electrodes 110.
  • a measurement voltage 136 is applied to the measuring electrode 120 by means of a voltage source 135.
  • the ionization region 150 is located between the measuring electrode and the multiplicity of passive electrodes. This ensures that conductive contaminations that may be present on the electrode housing 100 and can form a creepage path to the reference potential 132 do not constitute a bypass path for the ionization current to be detected.

Landscapes

  • Elimination Of Static Electricity (AREA)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)

Abstract

L'invention concerne un procédé de surveillance de la fiabilité fonctionnelle d'au moins une électrode passive afin de neutraliser des charges superficielles. Pour assurer une protection personnelle efficace et une protection efficace contre les explosions, le procédé de l'invention porte sur l'utilisation d'au moins une électrode de mesure pour appliquer une intensité de champ de mesure à une région d'ionisation et pour détecter la circulation d'un courant d'ionisation à travers ladite région d'ionisation.
EP12743810.9A 2011-07-04 2012-06-27 Procédé de surveillance de la fiabilité fonctionnelle d'au moins une électrode passive et appareil de surveillance de la fiabilité fonctionnelle d'au moins une électrode passive Withdrawn EP2730150A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110078603 DE102011078603B4 (de) 2011-07-04 2011-07-04 Verfahren zum Überwachen der Funktionssicherheit von mindestens einer passiven Elektrode sowie Vorrichtung zum Überwachen der Funktionssicherheit von mindestens einer passiven Elektrode
PCT/US2012/044460 WO2013006348A1 (fr) 2011-07-04 2012-06-27 Procédé de surveillance de la fiabilité fonctionnelle d'au moins une électrode passive et appareil de surveillance de la fiabilité fonctionnelle d'au moins une électrode passive

Publications (1)

Publication Number Publication Date
EP2730150A1 true EP2730150A1 (fr) 2014-05-14

Family

ID=46634511

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12743810.9A Withdrawn EP2730150A1 (fr) 2011-07-04 2012-06-27 Procédé de surveillance de la fiabilité fonctionnelle d'au moins une électrode passive et appareil de surveillance de la fiabilité fonctionnelle d'au moins une électrode passive

Country Status (3)

Country Link
EP (1) EP2730150A1 (fr)
DE (1) DE102011078603B4 (fr)
WO (1) WO2013006348A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019125133A1 (de) * 2019-09-18 2021-03-18 Illinois Tool Works Inc. System zum neutralisieren von oberflächenladungen und verfahren zum überwachen der funktionssicherheit eines solchen systems

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2397124A1 (fr) * 1977-07-05 1979-02-02 Commissariat Energie Atomique Dispositif d'elimination de charges electriques
US5930105A (en) * 1997-11-10 1999-07-27 Ion Systems, Inc. Method and apparatus for air ionization
JP3464177B2 (ja) * 1999-09-06 2003-11-05 沖電気工業株式会社 半導体製造装置および静電気除去方法
JP4027410B1 (ja) * 2007-02-13 2007-12-26 一雄 岡野 コロナ放電型イオナイザの検査方法及び検査装置
US7970031B2 (en) * 2009-11-11 2011-06-28 Flir Systems, Inc. Q-switched laser with passive discharge assembly

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2013006348A1 *

Also Published As

Publication number Publication date
DE102011078603A1 (de) 2013-01-10
DE102011078603B4 (de) 2013-07-25
WO2013006348A1 (fr) 2013-01-10

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