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EP4216381B1 - Ioniseur et procédé de neutralisation de charges sur des surfaces - Google Patents

Ioniseur et procédé de neutralisation de charges sur des surfaces

Info

Publication number
EP4216381B1
EP4216381B1 EP23150441.6A EP23150441A EP4216381B1 EP 4216381 B1 EP4216381 B1 EP 4216381B1 EP 23150441 A EP23150441 A EP 23150441A EP 4216381 B1 EP4216381 B1 EP 4216381B1
Authority
EP
European Patent Office
Prior art keywords
positive
waveform
negative
charges
treated
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.)
Active
Application number
EP23150441.6A
Other languages
German (de)
English (en)
Other versions
EP4216381A1 (fr
Inventor
Matthias Hecht
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
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Filing date
Publication date
Application filed by Illinois Tool Works Inc filed Critical Illinois Tool Works Inc
Publication of EP4216381A1 publication Critical patent/EP4216381A1/fr
Application granted granted Critical
Publication of EP4216381B1 publication Critical patent/EP4216381B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • H01T19/04—Devices providing for corona discharge having pointed electrodes
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
    • H05F3/00—Carrying-off electrostatic charges
    • H05F3/04—Carrying-off electrostatic charges by means of spark gaps or other discharge devices

Definitions

  • the present invention relates to an ionizer for neutralizing charges on surfaces, in particular an ionizer based on alternating voltage. According to a further aspect, the invention relates to a method for neutralizing charges on surfaces, in particular using alternating voltage.
  • Spontaneous and uncontrolled discharges can cause significant problems. For example, they can disrupt manufacturing processes, especially if material webs accidentally stick together due to the electrostatic charge. There are even more serious consequences: electrical devices can be damaged if the discharge occurs through them. Finally, uncontrolled discharges can lead to fires, especially when processing highly flammable materials.
  • Discharge devices for the contactless reduction of electrostatic charges on electrically insulating materials are well known and used in many production processes.
  • the ionization of the air by the electrode usually occurs independently of the degree and/or polarity of the material charge on the surface to be treated. Accordingly, it is not possible, or not readily possible, to achieve surfaces with residual charges of +/-10V with the prior art arrangements.
  • the present invention is based on the object of specifying an ionizer and a method for neutralizing charges on surfaces with which particularly low residual charges, in particular below +/- 10V, can be achieved without increasing the manufacturing costs.
  • the ionizer according to the invention enables a particularly efficient, active neutralization of surface charges, so that residual charges in the range of less than +/-10 volts can be achieved.
  • the AC voltage source comprises an inverter connected to the primary side of the transformer.
  • the control device is designed to control the waveform by controlling the inverter.
  • the control device can be designed to directly control an AC voltage source designed as a power supply, so that an asymmetrical waveform is output.
  • the positive ion data can be determined by a measuring device located on the secondary side of the transformer for measuring the amount of positive electricity and transmitted to the control device.
  • the negative ion data can be determined by a corresponding measuring device located on the secondary side of the transformer and designed to determine the amount of electricity of negative charges.
  • the waveform for generating the ions can be precisely adapted to the number of positive and negative charges on the surface to be treated, so that a particularly low residual charge value can be achieved.
  • changing the provided AC voltage comprises reducing the amplitude of the provided positive half-wave and/or the negative half-wave.
  • changing the provided alternating voltage comprises flattening a voltage increase during the positive and/or negative half-wave.
  • FIG. 1 shows a schematic view of a discharge device 18 and a surface 10 to be treated.
  • the surface 10 to be treated can, for example, be a material web that is wound up and unwound in rolls (not shown here). When winding up and unwinding material webs from such rolls, a separation of thin material layers from one another occurs, which can lead to a charging of the surface 10. In the embodiment shown here FIG. 1 As a result, positive charges 12 and negative charges 14 have accumulated on the material web 10.
  • FIG. 1 a discharge device 18 is shown, which can be part of an ionizer (not shown in full).
  • the discharge device 18 is rod-shaped and has a plurality of discharge electrodes 20.
  • Each of these discharge electrodes 20 is supplied with high voltage, so that a strong electric field is created at the tip-shaped electrode 20, through which positive or negative ions can be released. Ions released in this way are discharged onto the material web as an ion cloud in order to neutralize the charges 12, 14.
  • the surface 10 shown as a material web can move, for example, in the direction of arrow 22 relative to the stationary discharge device 18.
  • the invention is not limited to a specific number of discharge electrodes or discharge devices. Rather, the ionizer of the present invention may comprise any number of discharge electrodes.
  • the discharge device comprises, instead of or in addition to the discharge electrodes, blowing heads or rotating nozzles connected to the ionizer's AC voltage source.
  • FIG. 1 As the FIG. 1 As can also be seen, there is an imbalance of positive and negative charges 12, 14 on the surface 10 of the material web.
  • the exemplary embodiment shown here shows an excess of positive charge carriers. To detect the positive and negative charges 12, 14, these can be measured, in particular, before the ionizer is put into operation. This embodiment is based on the consideration that the proportion of positive and negative charges changes only insignificantly in an established manufacturing process and thus a one-time calibration upon commissioning of the ionizer is generally sufficient.
  • a sensor device (not shown) can be provided, which continuously or at predetermined times detects the surface charge and communicates this to a blocking device.
  • a sensor device (not shown) can be provided, which continuously or at predetermined times detects the surface charge and communicates this to a blocking device.
  • “field mill sensors” or “piezoelectric field sensors” can be used, which are aligned with respect to the surface 10 to be discharged in such a way that a measurement of the electrostatic field of the surface 10 is possible via the physical effect of "charging by induction.”
  • the AC voltage source can be a power supply that is operated with an AC voltage, wherein the control device 48 is then designed to control the power supply such that a modification of the AC voltage applied to the input of the AC voltage source 42 is controllable.
  • the waveform provided at the output 41 of the AC voltage source 42 can also be adjusted by the control device 48.
  • control device is configured to control the waveform such that the positive and negative half-waves are asymmetrical to each other.
  • the control device 48 can be configured to change the amplitude and/or the rise/fall of the positive and negative half-waves so that an asymmetrical waveform is formed. Examples of such modified, asymmetrical waveforms are FIGS. 4 and 5 can be found.
  • the control device 48 is designed to control the waveform at the output of the AC voltage source 42 based on the surface charge data.
  • the control device can control a waveform according to Figure 4 If surface charge measurements indicate an excess of positive charge carriers on the surface, the control device 48 can set a waveform in the sense of Figure 5 set.
  • the control device 48 can be configured to determine a difference in the number of positive and negative charges on the surface based on surface charge data.
  • the difference can be a positive value if an excess of positive charge carriers is present.
  • a negative difference value can indicate an excess of negative charge carriers on the surface.
  • a difference value of essentially zero indicates a substantially neutrally charged surface.
  • the control device can control the waveform based on this difference.
  • the control device 48 can be designed to compare the difference in the charge carriers on the surface to be treated with one or more limit values.
  • the control device 48 can be designed to compare the difference value with a first limit value.
  • the first limit value can be a positive limit value. If the difference is positive (excess of positive charge carriers) and lies above the limit value, the control device 48 can reduce the amplitude of the positive half-wave of the waveform, as is the case, for example, in Fig. 4 is shown.
  • Comparing the difference of charge carriers on the surface to be treated with one or more threshold values has the advantage that a change in the ions released by the ionizer electrode (i.e. a change in the waveform) is only made when significant charge differences on the surface have been detected.
  • the positive amplitude 142 of waveform 130 is reduced to approximately 5.5 kV, whereby fewer positive ions are produced at the electrodes of the ionizer compared to the negative ions. This is the case because ions are typically only produced at the tip-shaped electrodes of the discharge device above a threshold voltage.
  • An exemplary limit voltage of 4 kV is represented by the hatched discharge voltage ranges 150, 152, 154 on the positive half-waves 132, 134, 136 as well as the discharge voltage ranges 156, 158 of the negative half-waves 138, 140.
  • the limit voltage also depends in particular on the arrangement of the discharge electrodes and can therefore vary considerably.
  • the areas of the discharge regions 150, 152, 154 of the positive half-waves 132, 134, 136 are significantly smaller than the areas of the discharge regions 156, 158 of the negative half-waves 138, 140.
  • a larger proportion of the electrical work generated by the negative half-waves 138, 140 is used to produce negative ions than is the case with the positive half-waves 132, 134, 136.
  • An adjustment of the amplitude, in particular a reduction of the amplitude, of the positive half-waves 132, 134, 136 is carried out according to the FIG. 4 by flattening the slope of the positive half-waves 132, 134, 136.
  • the voltage rise in the positive half-waves 132, 134, 136 of the waveform 130 is slower than it is in the negative half-waves 138, 140.
  • the slower rise and the associated broadening/lengthening of the positive half-waves 132, 134, 136 results in a reduction in the amplitude 142 of the positive half-waves 132, 134, 136.
  • FIG. 5 Another embodiment of a waveform according to the present invention is shown in FIG. 5
  • the waveform 230 in FIG. 5 corresponds essentially which in the FIG. 4 shown waveform 130, but mirrored about the zero axis. Accordingly, the waveform 230 is also FIG. 5 asymmetric.
  • the waveform 230 of the FIG. 5 not the amplitude 242 of the positive half-waves 232, 234, 236 is reduced. Rather, in waveform 230, the amplitude 244 of the negative half-waves 238, 240 is now reduced.
  • the reduction of the amplitude 244 of the negative half-waves 238, 240 is carried out according to the FIG. 5 by reducing the slope of the negative half-waves 238, 240.
  • the resulting amplitude 244 of the negative half-waves 238, 240 can have a value of approximately -5.5 kV, with the positive amplitude 242 of the positive half-waves 232, 234, 236 having a value of approximately 7 kV.
  • the discharge voltage ranges 250, 252, 254 of the positive half-waves 232, 234, 236 also have a correspondingly larger area than is the case with the discharge voltage ranges 256, 258 of the negative half-waves 238, 240. It follows that a waveform 230 with negative half-waves of reduced amplitude is used in particular for the treatment of surfaces on which an excess of negative charge carriers is detected.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Elimination Of Static Electricity (AREA)

Claims (14)

  1. Ioniseur (40) pour neutraliser des charges sur des surfaces, dans lequel l'ioniseur (40) comprend les éléments suivants :
    • une source de tension CA (42) comprenant une sortie qui fournit en sortie une forme d'onde (130, 230) ayant une demi-onde positive (132, 134, 136, 232, 234, 236) et ayant une demi-onde négative (138, 140, 238, 240) ;
    • un transformateur (44) ayant un côté primaire (43) et un côté secondaire (45),
    dans lequel le côté primaire (43) est raccordé électriquement à la sortie de la source de tension CA (42) ;
    • un dispositif de décharge (18) qui est raccordé électriquement au côté secondaire (45) du transformateur ;
    • un moyen de commande (48) pour ajuster la forme d'onde (130, 230), dans lequel le moyen de commande (48) est configuré afin de commander la forme d'onde (130, 230) de telle manière que les demi-ondes positives et négatives (132, 134, 136, 138, 140, 232, 234, 236, 238, 240) sont asymétriques les uns par rapport aux autres, caractérisé en ce que la source de tension CA (42) comprend un onduleur raccordé au côté primaire (43) du transformateur, dans lequel le moyen de commande (48) est configuré afin de commander la forme d'onde (130, 230) en entraînant l'onduleur.
  2. Ioniseur (40) selon la revendication 1,
    dans lequel le moyen de commande (48) est configuré pour réduire une amplitude de la demi-onde positive (132, 134, 136, 232, 234, 236) et/ou de la demi-onde négative (138, 140, 238, 240) fournie par la source de tension CA (42).
  3. Ioniseur (40) selon la revendication 1 ou 2,
    dans lequel le moyen de commande (48) est configuré afin d'aplatir une augmentation de tension au moins dans des régions pendant la demi-onde positive et/ou négative (132, 134, 136, 138, 140, 232, 234, 236, 238, 240).
  4. Ioniseur (40) selon l'une quelconque des revendications 1 à 3,
    dans lequel le moyen de commande (48) est configuré pour :
    • recevoir des données de charge de surface indicatives des charges électriques (12, 14) situées sur une surface (10) à traiter ;
    • commander la forme d'onde (130, 230) sur la base des données de charge de surface.
  5. Ioniseur (40) selon la revendication 4,
    dans lequel les données de charge de surface comprennent une ou plusieurs des données suivantes :
    • des données d'ions positifs indicatives d'une quantité de charges positives sur la surface à traiter ;
    • des données d'ions négatifs indicatives d'une quantité de charges négatives sur la surface à traiter.
  6. Ioniseur (40) selon la revendication 5,
    dans lequel le moyen de commande (48) est configuré pour :
    • déterminer un nombre de charges positives sur la surface à traiter sur la base des données d'ions positifs ;
    • déterminer un nombre de charges négatives sur la surface à traiter sur la base des données d'ions négatifs ;
    • déterminer une différence entre le nombre de charges positives et négatives sur la surface à traiter ;
    • commander la forme d'onde (130, 230) sur la base de la différence entre les charges positives et négatives.
  7. Ioniseur (40) selon la revendication 6,
    dans lequel le moyen de commande (48) est configuré pour :
    • comparer la différence entre le nombre de charges positives et négatives sur la surface à traiter avec une première valeur seuil ;
    • réduire l'amplitude de la demi-onde positive (132, 134, 136, 232, 234, 236) de la forme d'onde (130, 230) lorsque la différence dépasse la première valeur seuil.
  8. Ioniseur (40) selon la revendication 6 ou 7,
    dans lequel le moyen de commande (48) est configuré pour :
    • comparer la différence entre le nombre de charges positives et négatives sur la surface à traiter avec une deuxième valeur seuil ;
    • réduire l'amplitude de la demi-onde négative (138, 140, 238, 240) de la forme d'onde (130, 230) lorsque la différence tombe en dessous de la deuxième valeur seuil.
  9. Procédé pour neutraliser des charges sur des surfaces, dans lequel le procédé comprend les étapes suivantes :
    • la fourniture d'une tension CA ayant une forme d'onde (130, 230) avec une demi-onde positive (132, 134, 136, 232, 234, 236) et une demi-onde négative (138, 140, 238, 240) ;
    • la modification de la tension CA alimentée en une tension d'entrée à l'aide d'un onduleur de sorte que la tension d'entrée présente une demi-onde positive et une demi-onde négative (132, 134, 136, 138, 140, 232, 234, 236, 238, 240) qui sont asymétriques l'une par rapport à l'autre ;
    • la conversion de la tension d'entrée en une tension de sortie au moyen d'un transformateur ;
    • l'application de la tension de sortie à un dispositif de décharge.
  10. Procédé selon la revendication 9,
    dans lequel la modification de la tension CA alimentée comprend une réduction de l'amplitude de la demi-onde positive et/ou de la demi-onde négative fournie.
  11. Procédé selon la revendication 9 ou 10,
    dans lequel la modification de la tension CA alimentée comprend, au moins dans des régions, un aplatissement d'une augmentation de tension pendant la demi-onde positive et/ou négative (132, 134, 136, 138, 140, 232, 234, 236, 238, 240).
  12. Procédé selon la revendication 9 à 11,
    dans lequel le procédé comprend en outre :
    • la réception de données de charge de surface indicatives des charges électriques situées sur une surface à traiter ;
    • la modification de la forme d'onde (130, 230) alimentée sur la base des données de charge de surface.
  13. Procédé selon la revendication 9 à 12,
    dans lequel le procédé comprend en outre :
    • la détermination d'un nombre de charges positives (12) sur la surface à traiter sur la base des données d'ions positifs ;
    • la détermination d'un nombre de charges négatives (14) sur la surface à traiter sur la base des données d'ions négatifs ;
    • la détermination d'une différence entre le nombre de charges positives et négatives sur la surface à traiter ;
    • la modification de la forme d'onde (130, 230) alimentée sur la base de la différence entre les charges positives et négatives.
  14. Procédé selon la revendication 13,
    dans lequel le procédé comprend en outre :
    • la comparaison de la différence entre le nombre de charges positives et négatives sur la surface à traiter avec une première valeur seuil et/ou une deuxième valeur seuil ;
    • la réduction de l'amplitude des demi-ondes positives de la forme d'onde (130, 230) lorsque la différence dépasse la première valeur seuil ou la réduction de l'amplitude des demi-ondes négatives de la forme d'onde (130, 230) lorsque la différence tombe en dessous de la deuxième valeur seuil.
EP23150441.6A 2022-01-19 2023-01-05 Ioniseur et procédé de neutralisation de charges sur des surfaces Active EP4216381B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102022101193.3A DE102022101193B4 (de) 2022-01-19 2022-01-19 Ionisator und Verfahren zum Neutralisieren von Ladungen auf Oberflächen

Publications (2)

Publication Number Publication Date
EP4216381A1 EP4216381A1 (fr) 2023-07-26
EP4216381B1 true EP4216381B1 (fr) 2025-07-23

Family

ID=84887886

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23150441.6A Active EP4216381B1 (fr) 2022-01-19 2023-01-05 Ioniseur et procédé de neutralisation de charges sur des surfaces

Country Status (3)

Country Link
EP (1) EP4216381B1 (fr)
DE (1) DE102022101193B4 (fr)
ES (1) ES3049595T3 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1589781A1 (de) * 1967-04-06 1970-05-14 Bayer Ag Verfahren und Schaltanordnung zum Entladen von elektrostatisch aufgeladenen Gegenstaenden
JPS4937864B1 (fr) 1970-10-02 1974-10-12
US4271451A (en) * 1976-07-20 1981-06-02 Hercules Incorporated Method and apparatus for controlling static charges
US4423462A (en) 1982-07-21 1983-12-27 The Simco Company, Inc. Controlled emission static bar
DE19710984C1 (de) 1997-02-20 1998-08-20 Haug Gmbh & Co Kg Vorrichtung zur Beseitigung von elektrostatischen Aufladungen von Gegenständen
JP5212787B2 (ja) * 2008-02-28 2013-06-19 Ｓｍｃ株式会社 イオナイザ
JP6139747B1 (ja) 2016-05-10 2017-05-31 三菱電機株式会社 放電装置

Also Published As

Publication number Publication date
EP4216381A1 (fr) 2023-07-26
DE102022101193B4 (de) 2023-11-30
ES3049595T3 (en) 2025-12-17
DE102022101193A1 (de) 2023-07-20

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