EP2051345B1 - Dispositif d'électrodes - Google Patents

Dispositif d'électrodes Download PDF

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Publication number
EP2051345B1
EP2051345B1 EP20080166019 EP08166019A EP2051345B1 EP 2051345 B1 EP2051345 B1 EP 2051345B1 EP 20080166019 EP20080166019 EP 20080166019 EP 08166019 A EP08166019 A EP 08166019A EP 2051345 B1 EP2051345 B1 EP 2051345B1
Authority
EP
European Patent Office
Prior art keywords
electrode
voltage
distance
determining
parameter
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
EP20080166019
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German (de)
English (en)
Other versions
EP2051345A3 (fr
EP2051345A2 (fr
Inventor
Lukas Hahne
Thomas Vinnay
Thomas Schopferer
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.)
Eltex Elektrostatik GmbH
Original Assignee
Eltex Elektrostatik GmbH
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Filing date
Publication date
Application filed by Eltex Elektrostatik GmbH filed Critical Eltex Elektrostatik GmbH
Publication of EP2051345A2 publication Critical patent/EP2051345A2/fr
Publication of EP2051345A3 publication Critical patent/EP2051345A3/fr
Application granted granted Critical
Publication of EP2051345B1 publication Critical patent/EP2051345B1/fr
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
    • H01T23/00—Apparatus for generating ions to be introduced into non-enclosed gases, e.g. into the atmosphere

Definitions

  • the present invention relates to an electrode device for contactless elimination of an electrostatic charge from a conveyed or to be conveyed electrically substantially insulating material according to the preamble of patent claim 1.
  • An electrode device according to the preamble of claim 1 is known from US Pat. No. 6,674,630 B1 known.
  • substantially insulating materials are meant such materials which act at least over the greater area of their surface as an insulator or poor electrical conductor, e.g. As printing or packaging papers, plastic films, foil-laminated papers, plastic-laminated metal foils or even bulk material such as plastic granules or the like.
  • electrostatic charging phenomena are known and feared. The electrostatic charges may cause not only sparking but also destruction of the material and other undesirable consequences.
  • contactless electrode devices are known and commercially available. These have proven themselves in many application situations.
  • the known discharge systems or electrode devices make use of the electric field emanating from the charged material to the electrode device for charge compensation by supplying gas ions and free electrons into the electric field. Due to the force effect of the electric field, these are attracted to opposite polarity charges on the charged material and there cause a neutralization or a compensation of the charge.
  • the electrostatic charge can vary in the material itself, ie, for example, in the processing of roll material, from section to section of the material wound on the roll, so that removal of the electrostatic charge adapted to the respective electrostatic charging conditions would be desirable.
  • the parameters with which the elimination of the charge can be influenced are, on the one hand, the voltage applied to the electrode (s) of the electrode device and a duty ratio of the electrodes. Further, as a parameter, the frequency at which the electrode is supplied with voltage of opposite polarity, or the current flowing through the electrodes come into question.
  • the two parameters intervene, at least indirectly, to regulate the voltage, since at high frequencies the maximum voltage can no longer be reached due to the capacitances in the circuit. Even with current regulation, the voltage is effectively limited accordingly.
  • the duty ratio of the electrodes is the ratio of the time intervals in which a positive voltage is applied to the electrode or the electrodes of the electrode device and in which a negative voltage is applied. To this day, these parameters (either the electrode voltage and / or the duty cycle) mostly set manually on the apparatus. This is labor-intensive, labor-intensive and thus relatively expensive, beyond that possibly very inaccurate.
  • an object of the present invention to provide an electrode device for the contactless elimination of an electrostatic charge of a subsidized or to be conveyed electrically substantially insulating material, in which a good discharge result with the least possible (personnel) effort and thus in a cost-effective manner and manner is achievable.
  • the first and second preferred embodiments of an electrode device 1 according to the invention which are intended for contactless removal or discharge of an electrostatic charge from a conveyed or to be conveyed electrically substantially insulating material, comprise an electrode profile 2 in the form of an electrode cascade in which or in which a plurality of electrodes 3, which electrode tips 4, are arranged.
  • the electrode device 1 comprises a voltage supply 5, which is in electrically conductive connection with a switch 6.
  • the switch 6 can switch back and forth between two oppositely poled voltage sources in the form of high-voltage generators, for example high-voltage cascades 7, 7a.
  • the switch 6 is connected to a variable clock 9 via a control and data line 10, which controls the switching or the connection of the electrodes 3 to the respective high voltage sources 7, 7a and thus their polarity. Furthermore, the clock 9 is connected via a control and data line 11 to a control device 12 (hereinafter referred to as controller 12 for short), which controls the clock 9. With the controller 12 is still on a control and data line 13, a measuring device 14 for measuring a current ratio in combination.
  • the current ratio is defined as the ratio of a current flowing through the voltage supply 5 with a positive polarity of the electrodes 3 and a current flowing through the voltage supply 5 with a negative polarity of the electrodes 3.
  • This ratio is correlated with a surface potential of a material or charge of the material to be removed by the electrode device.
  • the ratio is thus preferably determined by currents flowing in the electrodes.
  • the Measuring device has an internal memory to store the respective current values and also an internal computing device, which forms the ratio and then passes this on the control and data line 13 to the controller 12. This task can also be integrated in the control.
  • parameter current ratio In addition to the parameter current ratio, other parameters are correlated with the surface potential or the charge of the material to be discharged. In particular, this is an active current ratio, an effective current difference, the absolute current difference or the already described (absolute) current ratio. Furthermore, there are also a current through the electrode after switching off the voltage supply and / or a charge shift, which z. B. can be measured in the range of the electrode profile, as suitable parameters or measures available. The parameters to be determined are therefore preferably those which arise in the electrodes or are already measurable there.
  • the controller 12 controls, taking into account the removal of the electrode profile 2 or the electrode tips 4 from the material to be discharged, the voltage applied to the electrodes and / or the applied duty cycle. This is defined as the ratio of the time interval in which a positive voltage is applied to the electrode and the time interval in which a negative voltage is applied to the electrode.
  • the duty cycle is 1, whereas the duty cycle would be 2 if twice as long a positive voltage is applied to the electrodes as a negative voltage.
  • control of the frequency at which the polarity of the electrodes is changed and / or control of the current flowing through the electrodes would be conceivable.
  • the control of the electrode voltage and / or the duty cycle (and possibly the frequency or the current strength) is based on value or calibration tables or curves and / or of fit parameters, which determine or calculate the values for the electrode voltage and / or the duty cycle (or, respectively), which are optimized for the measured parameters and the distance between the material to be discharged and the electrode profile 2 Frequency or current).
  • the distance between the electrode profile 2 or the electrodes 4 and the material to be discharged influences all parameters listed above (these vary depending on the distance from the source of the electric field).
  • the distance in which the electrode profile 2 or the electrodes 4 are mounted by the material to be discharged via an input device 15, which in turn with the controller 12 via a control and data line 13a (conceivable here would be only one data line) is connected.
  • the distance could also be specified as a fixed value in a memory.
  • the preferred embodiment described above thus represents an electrode device 1 which can be operated with a high level of comfort and at a low purchase price in systems in which the distance ratios between the electrode device 1, and in particular between the electrode profile 2 and the electrode tips 4 and the material to be unloaded does not change substantially or continuously, so that with occasional changes a recalibration of the device in the form of the input of a new distance parameter to the controller 12 via the input device 15 can take place.
  • the control with a distance virtually quasi continuously or else at predetermined discrete intervals via a signal input for receiving a signal, wherein the signal contains information about the distance between the electrode device 1 or the electrode profile 2 or the electrode tips 4 and the material to be discharged (embodiment not shown in the figures).
  • the distance between the electrode device 1 and the material to be discharged is determined by a distance determining device integrated in the electrode device 1 in the form of two ultrasonic distance measuring devices 17.
  • a distance determining device integrated in the electrode device 1 in the form of two ultrasonic distance measuring devices 17.
  • the use of only one ultrasonic distance measuring device is conceivable (see. 3 and 4 ).
  • This construction is intended in particular for discharging webs or materials which change their distance from the electrode device.
  • the second preferred embodiment is optimized for discharge of materials in the area of reels whose reel diameter decreases with increasing unwind time.
  • any other distance determination devices which operate, for example, on an optical or acoustic basis, as well as combinations of these devices, are conceivable.
  • distance determining devices which comprise a laser or a radar distance measuring device.
  • combinations of optical and / or acoustic distance measuring devices such.
  • combinations of ultrasonic and laser and / or radar distance measuring devices conceivable.
  • the ultrasonic distance measuring devices 17 each comprise an ultrasonic transmitter and an ultrasonic receiver so as to be able to determine the running time of emitted and reflected ultrasonic pulses.
  • the second preferred embodiment further differs from the first preferred embodiment in having a variable (high) voltage source 18, which in turn communicates with the controller 12 via a control and data line.
  • the voltage source can be controlled on the one hand by the controller 12 and on the other hand 19 data on the operating state of the voltage source 18 can be provided via the control and data line.
  • the switch 6 can be omitted, the clock is connected via respective control and data lines 20 and 21 with the variable voltage source 18 and the controller 12, so as to ensure an optimal timing of the output voltage.
  • the two ultrasonic distance measuring devices are on each control and Data lines 22, 23 with their associated control unit 24 in connection, which makes the distance determination.
  • a third preferred embodiment of an inventive electrode device 1 is shown, which in contrast to the electrode device 1 according to Fig. 2 comprises a second electrode profile 2a.
  • the electrode profile 2 is connected to the positive output of a voltage source, which is integrated into the controller 12 in the preferred third embodiment, while the electrode profile 2a with the negative output of another voltage source, which is also integrated into the controller 12 in combination stands.
  • a voltage source which is integrated into the controller 12 in the preferred third embodiment
  • the electrode profile 2a with the negative output of another voltage source which is also integrated into the controller 12 in combination stands.
  • an active current ratio is determined as the parameter which varies depending on the surface potential on the conveyed or to be conveyed material.
  • the active current or the active current ratio is capable of delivering a parameter which arises in the electrodes or the electrode profiles.
  • the active current ratio is defined as the ratio of a positive active current and a negative active current.
  • the positive active current is the sum of the currents flowing through the positive active electrode profile 2 and the passive negative electrode profile 2a.
  • the negative active current is defined as the sum of the currents flowing through the active negative electrode profile 2a and the passive positive electrode profile 2.
  • the two electrode profiles 2, 2a or more precisely the electrodes 3 are connected via respective measuring, data and control lines 26, 27 to a device 28 for determining the effective current ratio.
  • only one ultrasonic distance measuring device is present. It is arranged in the middle between the two electrode profiles 2, 2a, each half its length.
  • the control and evaluation unit 24 for the ultrasonic distance measuring device 17 is connected via a control and data line 29 with the electrode profiles 2 and 2a associated ultrasonic distance measuring device 17 in combination.
  • the control and evaluation unit 24 is connected to the controller 12 via a further control and data line 31.
  • an electrode device 1 with two electrode profiles 2 and 2a is that the polarity which is applied to the electrodes 3 and the electrode tips 4 does not have to be switched and that the voltage source does not necessarily have to be variable.
  • post-circuit-side switching elements such as the switch 6
  • the active current ratio in this construction is a readily accessible, resulting in the electrode device parameter, which is easily and preferably already there measurable. Due to the formation of ratios further properties of the electrode profiles 2, 2 a, such as their length is of no importance for the controller 12.
  • tables of values or calibration tables or values and / or fit parameters for all electrode profiles optimum control result can be achieved. Ie. that is, the data that the controller 12 must store need not be adjusted to either the electrode length or the number of electrodes.
  • the main field of application of the third preferred embodiment is in the area of windings, as shown in FIG Fig. 4 is shown, ie in areas in which the material to be discharged varies its distance from the electrode device 1.
  • FIG. 5 a further preferred embodiment of an electrode device according to the invention is shown. These are essentially the same embodiment as in the FIGS. 3 and 4 is shown, wherein however, in the fourth preferred embodiment no distance measurement takes place. In this respect, it corresponds to the first preferred embodiment, but with respect to the first preferred embodiment, a second electrode profile 2a is present. Field of application of such a device, for example, the discharge in a well-defined constant or not often changing distance to the material to be unloaded.
  • the fourth preferred embodiment could also have a signal input for a signal which contains distance information or a distance input device or has a fixed distance preprogrammed.
  • the material to be unloaded can not only be material, which is arranged on windings, as shown in the drawings, but also sheets that are in the form of a stack, or to other material collections or bulk material. It should also be noted at this point that all combinations of items, in particular the different voltage sources or the various dimensional, control and clock devices are conceivable. For example, it is conceivable that two high-voltage sources 7, 7a in accordance with Fig. 1 may also be present in the other preferred embodiments. Also a combination of a switch 6 according to Fig. 1 For example, with the other embodiments is conceivable. The same applies to the clock 9 and the other devices. All combinations are conceivable in this context.
  • Fig. 6 shows a detailed representation of an electrode profile 2, or an electrode profile 2a (both Elelctrodenprofile are identically formed) shows.
  • the voltage supply 5 is in communication with a multiplicity of corona high-voltage electrodes 3, which comprise electrode tips 4.
  • the electrodes 3 are each associated with high-voltage resistors 32, which serve to limit the flow of current through the electrodes 3, which may be advantageous for example when touched by a human. It should be noted at this point that, as an alternative to the resistors 32, a direct connection of the electrodes 3 to the supplied high voltage is conceivable. As a result, the discharge result may possibly be slightly improved again.
  • the electrodes are cast together with the resistors 32 in the electrode profile 2, 2a (the electrode profile 2, 2a represents the carrier body) by means of a poly-urethane composition.
  • a poly-urethane composition instead of poly-urethane compound, all other resins or plastics conceivable for this purpose of action come into question. Embedding in the potting compound secures the high-voltage insulation against the housing or the electrode profile 2, 2a.
  • a wire 8 which is earthed is cast in the region of the electrode tips 4 in the electrode profile 2, 2a.
  • the basic idea of the present invention also includes a method for controlling the electrode device 1 or any desired electrode device for non-contact elimination of an electrostatic charge from a conveyed or a flat, electrically substantially insulating material to be conveyed.
  • the method for controlling the electrode device comprises two steps, namely: determination of a parameter which varies depending on the surface potential of the conveyed or to be conveyed material, wherein this parameter, as already mentioned in connection with the apparatus construction, z. For example, absolute current differences, absolute current conditions and an active current ratio and / or the other enumerated parameters can act.
  • the controller can be any parameter that correlates with the surface charge or the surface potential of the material to be discharged.
  • the parameter is preferably produced in the electrodes of the electrode device accommodated in the respective electrode profile. After determining this parameter, the voltage applied to the electrodes and the duty cycle are controlled in dependence on the parameter determined in the first step. In this case, the controller knows either the distance through an input or the distance is a fixed value.
  • both a control of the electrode voltage eg, a positive voltage of 1,500 V and a negative voltage of 3,000 V
  • a control of the duty cycle eg, application of a positive Voltage to the electrode in a length of 50 milliseconds, a negative voltage to the electrodes in a length of 200 milliseconds
  • Conceivable and particularly preferred is a control of the two parameters.
  • the distance which finds input into the control of the electrode voltage and the clock ratio, is additionally determined.
  • a measurement is made every 20 seconds to determine the parameter with a duty cycle, which ensures that the current flowing through the electrodes has reached its final value, for example with a duty cycle of 50 to 50 and a frequency which also ensures that the current flowing through the electrodes has reached its final value, for example at a frequency of 5 to 10 Hz.
  • a correspondingly powerful voltage source higher frequencies up to, for example, 300 Hz or even beyond are conceivable.
  • Conceivable other time intervals between two determinations of the parameter are in the range of 5 to 60 seconds, in particular 10 to 40 seconds, and more particularly 15 to 30 seconds.
  • This measurement for determining the parameter and the distance is preferably over a period of 2 seconds, ie over several periods. It would also be conceivable to measure over a single period, but measurement over several periods would allow one Filtering the measured values and thus increases the precision of the measurement.
  • the sampling interval of the measurement is adapted to the following parameters of the end system: speed of change of the distance and rate of change of the surface charge. The slower these changes are, the greater the sampling interval can be chosen.
  • the distance measurement is preferably carried out simultaneously or at least quasi-simultaneously for parameter determination.
  • typical electrode voltages in the presently preferred embodiments are up to 50 kV.
  • Typical material speeds or web speeds with which the material to be unloaded moves are from 1 to 20 m / sec.
  • the current flow through the electrodes 3 of an electrode profile 2, 2a of length 1 m is typically between 50 ⁇ A and 500 ⁇ A.
  • the existing charging of the object to be unloaded is continuously detected by the devices according to the invention and the output power is automatically adapted to the conditions currently present.
  • the distance between the material to be discharged and the electrode device 1 is also continuously determined, so that the output power can be automatically adjusted to the changing distance ratios and the changing charge conditions or surface charge ratios of the object.
  • the high-voltage power supply is integrated into the electrode device 1 and is able to compensate for high charges in the shortest possible time, since up to 2 x 50 kV output voltage are available.

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Claims (11)

  1. Dispositif d'électrodes (1) pour l'élimination sans contact d'une charge électrostatique sur un matériau d'approvisionnement ou d'évacuation pour l'essentiel électriquement isolant avec au moins une électrode (3) disposée dans un profilé d'électrodes (2, 2a) et une amenée de tension (5) pour l'alimentation en tension d'au moins une électrode (3),
    dans lequel le dispositif d'électrodes (1) comporte de plus un dispositif (14) pour la détermination d'un paramètre qui varie en fonction du potentiel de surface sur le matériau d'approvisionnement ou d'évacuation, ainsi qu'un dispositif de commande (12) pour la commande d'une tension appliquée à au moins une électrode (3) et/ou d'un courant circulant à travers au moins une électrode et/ou d'un rapport cyclique et/ou d'une fréquence appliquant des tensions de polarités opposées à au moins une électrode ou les branchant et les débranchant, ce dispositif de commande commandant la tension des électrodes et/ou le rapport cyclique et/ou le courant et/ou la fréquence en fonction du paramètre
    caractérisé en ce que le dispositif d'électrodes (1) comporte une entrée de signal pour recevoir un signal contenant des informations sur une distance entre le dispositif d'électrodes (1) et le matériau.
  2. Dispositif d'électrodes (1) selon la revendication 1,
    caractérisé en ce que le dispositif pour la détermination d'un paramètre détermine un paramètre provenant d'au moins une électrode.
  3. Dispositif d'électrodes (1) selon une des revendications précédentes,
    caractérisé en ce que le dispositif d'électrodes (1) comporte au moins dispositif de détermination de distance (17) pour déterminer une distance entre le dispositif d'électrodes (1) et le matériau.
  4. Dispositif d'électrodes (1) selon une des revendications précédentes,
    caractérisé en ce que l'arrangement d'électrodes comporte au moins deux profilés d'électrodes (2, 2a) avec respectivement au moins une électrode (3).
  5. Dispositif d'électrodes (1) selon une des revendications précédentes,
    caractérisé en ce que la tension appliquée à l'électrode (aux électrodes) (3) du premier profilé (2) présente une polarité opposée à la tension appliquée à l'électrode (aux électrodes) (3) du deuxième profilé (2a).
  6. Dispositif d'électrodes (1) selon une des revendications 3 à 5,
    caractérisé en ce que le dispositif de détermination de distance (17) comporte un dispositif de mesure de distance optique et/ou un dispositif de mesure de distance acoustique.
  7. Dispositif d'électrodes (1) selon une des revendications 3 à 6,
    caractérisé en ce que le dispositif de détermination de distance comporte un dispositif de mesure de distance à ultrasons (17) et/ou à laser et/ou à radar.
  8. Dispositif d'électrodes (1) selon une des revendications précédentes,
    caractérisé en ce que le dispositif pour la détermination de l'autre paramètre comporte un dispositif d'enregistrement d'un rapport de courant actif.
  9. Dispositif d'électrodes (1) selon une des revendications précédentes,
    caractérisé en ce que le dispositif (14) pour la détermination de l'autre paramètre comporte un dispositif d'enregistrement d'une différence de courant actif et/ou de la différence absolue de courant et/ou du rapport absolu de courant et/ou d'un courant à travers au moins une électrode (3) après un arrêt de l'amenée de courant et/ou un déplacement de la charge.
  10. Dispositif d'électrodes (1) selon une des revendications précédentes,
    caractérisé en ce qu'un conducteur électrique mis à la terre, notamment un fil électrique (8), est disposé dans le profilé d'électrodes (2, 2a).
  11. Dispositif d'électrodes (1) selon une des revendications précédentes,
    caractérisé en ce que dans le dispositif de commande (12), on mémorise des paramètres de commande, notamment des tableaux de calibrage respectivement des courbes de calibrage et/ou des paramètres d'ajustement pour la commande de la tension des électrodes et/ou du rapport cyclique.
EP20080166019 2007-10-15 2008-10-07 Dispositif d'électrodes Not-in-force EP2051345B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200710049529 DE102007049529A1 (de) 2007-10-15 2007-10-15 Elektrodenvorrichtung

Publications (3)

Publication Number Publication Date
EP2051345A2 EP2051345A2 (fr) 2009-04-22
EP2051345A3 EP2051345A3 (fr) 2010-08-18
EP2051345B1 true EP2051345B1 (fr) 2011-09-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20080166019 Not-in-force EP2051345B1 (fr) 2007-10-15 2008-10-07 Dispositif d'électrodes

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EP (1) EP2051345B1 (fr)
DE (1) DE102007049529A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5212787B2 (ja) 2008-02-28 2013-06-19 Ｓｍｃ株式会社 イオナイザ
DE102009033827B3 (de) * 2009-07-18 2011-03-17 Thomas Ludwig Entladevorrichtung
DE102011007138B4 (de) 2010-12-17 2018-04-05 Metallux Ag Elektrodenanordnung, Herstellungsverfahren
CN102811543A (zh) * 2012-08-16 2012-12-05 无锡市电盾静电科技有限公司 喷绘机、写真机用静电消除器的放电装置

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GB1429821A (en) * 1973-02-02 1976-03-31 Ici Ltd Electrostatic charge controller
CH575670A5 (fr) * 1973-11-30 1976-05-14 Gruenenfelder H El Ing Eltex E
US4042971A (en) * 1974-09-30 1977-08-16 Hermann Brennecke Electrostatic charge neutralization
US4423462A (en) * 1982-07-21 1983-12-27 The Simco Company, Inc. Controlled emission static bar
DE3447779A1 (de) * 1984-12-29 1986-07-10 Haug GmbH & Co. KG, 7022 Leinfelden-Echterdingen Vorrichtung zur beseitigung elektrostatischer ladungen
JPH0982486A (ja) * 1995-09-07 1997-03-28 Fuji Photo Film Co Ltd ウエブの除電装置
US5930105A (en) * 1997-11-10 1999-07-27 Ion Systems, Inc. Method and apparatus for air ionization
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US6674630B1 (en) * 2001-09-06 2004-01-06 Ion Systems, Inc. Simultaneous neutralization and monitoring of charge on moving material
US6826030B2 (en) * 2002-09-20 2004-11-30 Illinois Tool Works Inc. Method of offset voltage control for bipolar ionization systems
DE10348217A1 (de) * 2003-10-16 2005-05-25 Brandenburgische Technische Universität Cottbus Vorrichtung und Verfahren zur Aerosolauf- oder Aerosolumladung in einen definierten Ladungszustand einer bipolaren Diffusionsaufladung mit Hilfe einer elektrischen Entladung im Aerosolraum
DE202006009823U1 (de) * 2005-12-21 2006-11-16 Eltex-Elektrostatik Gmbh Vorrichtung zur kontaktlosen Beseitigung einer elektrostatischen Doppelladungsschicht

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EP2051345A3 (fr) 2010-08-18
DE102007049529A1 (de) 2009-04-16
EP2051345A2 (fr) 2009-04-22

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