EP1802178B1 - Appareil de décharge sans contact d'électricité statique d'une couche à double charge - Google Patents

Appareil de décharge sans contact d'électricité statique d'une couche à double charge Download PDF

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Publication number
EP1802178B1
EP1802178B1 EP06118255.6A EP06118255A EP1802178B1 EP 1802178 B1 EP1802178 B1 EP 1802178B1 EP 06118255 A EP06118255 A EP 06118255A EP 1802178 B1 EP1802178 B1 EP 1802178B1
Authority
EP
European Patent Office
Prior art keywords
region
sheet
charge
conductive element
field strength
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
EP06118255.6A
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German (de)
English (en)
Other versions
EP1802178A3 (fr
EP1802178A2 (fr
Inventor
Thomas Ludwig
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
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
Priority claimed from DE102005061332.2A external-priority patent/DE102005061332B4/de
Application filed by Eltex Elektrostatik GmbH filed Critical Eltex Elektrostatik GmbH
Publication of EP1802178A2 publication Critical patent/EP1802178A2/fr
Publication of EP1802178A3 publication Critical patent/EP1802178A3/fr
Application granted granted Critical
Publication of EP1802178B1 publication Critical patent/EP1802178B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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 a device for contactless removal of an electrostatic charge double layer from a conveyed flat, electrically substantially insulating material according to claim 1.
  • the invention thus relates in particular to a device for removing an electrostatic charge double layer from a conveyed flat, electrically substantially insulating material.
  • a flat material is to be understood as meaning both a quasi-continuous web of material and isolated sheets, and essentially insulating materials are understood to be those which act as an insulator over at least the greater part of their surface, such as printing or packaging papers, plastic films, foil-laminated papers, plastic-laminated metal foils or the like.
  • a device for the contactless removal of electrostatic charges on the surface of moving material in a running direction is known per se ( US 2004/085705 ).
  • Charge bilayers are known and feared as electrostatic charging phenomena in various industries, particularly handling high speed insulating materials. By this is meant electrostatic charging of one side of an insulating material combined with opposite polarity electrostatic charging of the opposite side. Charge bilayers often occur on highly insulating, thin and high-speed webs or sheets and often lead to serious and costly process disturbances. They can even result in destruction of the material by spark discharge through it.
  • contactless discharge electrodes are known and commercially available and have proven useful in many applications; see. at www.eltex.de "FAQs for Discharge / Charging”.
  • the document DE 10 354 168 A1 relates to a device for the contactless removal of charges on the surface of moving material in one direction.
  • the device has at least one active on high voltage active discharge electrode, which is arranged transversely to the direction of one side of the moving material and at a distance therefrom.
  • the invention is therefore based on the object to provide an effective and contactless device, the In particular, in arrangements for rapid transport and for the rapid processing of materials of the aforementioned type can be used.
  • the invention is based on the finding that materials which carry charge double layers, in one-sided contact with an electrically conductive and earthed or grounded surface emanating from the side facing away from this top emanating, measurable electric field (hereinafter also referred to as near field) ,
  • the invention includes the essential idea of using this field for at least partial neutralization or compensation of the charge double layer by supplying charge carriers of suitable polarity into the relevant region (first region, neutralization region) of the sheet material.
  • said near field is measured in a measuring step in a second region (measuring region) of the sheet material and used to control a compensation step by which electric charges (positive or negative) are applied to the sheet material in the first region (neutralization region) Compensation of existing on the sheet material charges are supplied.
  • a device is characterized by a conductive element adjacent to the sheet material in the second region (measuring region) for forming a near-field electric field and a field strength measuring device assigned to the second region for detecting the field strength of the near field.
  • a compensation device is connected on the input side to the field strength measuring device and designed for the controlled supply of charge carriers in the first region (neutralization region) of the sheet material in response to the detection result.
  • the second area (measuring area) is arranged in the conveying direction of the sheet material downstream of the first area, such that the control of the feed of the charge carriers acts as a regulation.
  • the measurement of the electric near field takes place here after the compensation step. It is therefore a regulation.
  • the second region (measuring region) can be arranged opposite to the conveying direction of the sheet material upstream of the first region (neutralization region), so that the measurement of the near field of the double charge layer takes place before the compensation step. It is a controlled compensation.
  • control or regulation are characterized in particular by the fact that the compensation device is designed to selectively supply positive or negative charge carriers in response to the detection result of the field strength measuring device and to adjust their quantity as desired.
  • the proposed solution also makes it possible to easily convey and process charge-critical materials, such as plastic films or paper webs, in high-speed systems.
  • a preferred embodiment in conventional production systems provides that the first and / or second conductive element is designed as a conductive surface of a drive and / or guide element of a conveyor contacting the material web. Specifically, it is provided in this case that the second conductive (specially grounded) element is formed in the second region as the surface of a guide roller.
  • the compensation device itself has a charging electrode connected to a high voltage source, which faces the first conductive element with respect to the sheet material and supplies gas ions and free electrons to the material.
  • Remaining unipolar charges (virtually the uncompensated layer plane of the charge double layer or parts thereof) can be eliminated by one of the aforementioned compensating device in the material running direction following conventional unloading devices in a conventional manner.
  • Such an unloading device then comprises at least one known as such discharge electrode, as they u.a. is available from the applicant.
  • Fig. 1 shows a schematic diagram of a compensation device 10 for the compensation of double charges on a rapidly conveyed in a direction 12 material web 11.
  • the web is deflected in this embodiment via a first and second guide roller 13, 14 Z-shaped.
  • the guide rollers 13, 14 have a good conductive surface, which is grounded via a low-resistance connection.
  • an electric near field which is detected by a field strength measuring device 15, forms on the first deflecting roller 13.
  • the measuring device 15 is followed by a measuring amplifier 16 whose output is connected to an input of a control device 17.
  • the control device 17 wins from the processed field strength measurement signal a manipulated variable, which is supplied to a control input of a high voltage power supply unit 18.
  • the generated by this, in response to the field strength measurement signal controlled high voltage is supplied to a charging electrode 19, which, based on the material web 11, opposite the second guide roller 14 is arranged.
  • the electric field formed between the charging electrode 19 and the second deflecting roller 14 ionizes gas molecules in the atmosphere and generates and accelerates charge carriers (depending on the polarity and amount of the high voltage provided) towards the material web 11, which effect an at least substantial compensation of the charge double layer present there. Any remaining charges on the material web are tolerated in this example, which describes a controlled compensation of the charge double layer.
  • Fig. 2 As another example, another compensation device 20 is in one Fig. 1 shown similar representation. Functionally identical or similar components are included Fig. 1 designated reference numerals.
  • An insulating material web 21 has here via two grounded guide rollers 23, 24 in a running direction 22 a U-shaped portion of a path.
  • a field strength measuring device 25 is arranged opposite the second conductive deflecting roller 24, the measuring signal of which is fed into a processing and control device 26, at the output of which a manipulated variable for a controllable high voltage power supply 28 is provided.
  • This power supply unit 28 is connected to a charging electrode 29 acting in the same manner as in the first embodiment with respect to the first conductive deflecting roller 23.
  • the feed to the material web 21 via the charging or compensation electrode 29 supplied charge is adjusted by the control loop so that the measured field strength of the measuring device 25 field strength of the near field at the guide roller 24 is zero.
  • the design of the compensation process as a control thus already results in an improved compensation effect over the first embodiment.
  • conventional discharge electrodes 31, each with an associated power supply unit 32 are provided downstream of the second deflection roller 24, for removing any remaining unipolar charges on the two surfaces of the material web 21.
  • the two guide rollers 13 and 14 of Fig. 1 and the two guide rollers 23 and 24 of Fig. 2 grounded.
  • second guide roller 14 in Fig. 1 or first guide roller 23 in Fig. 2 defines in each case a first region (neutralization region) of the sheet material 11 or 21, in which the second deflection roller 14 in Fig. 1 or the first guide roller 23 in Fig. 2 preferably connected to ground potential, but may instead be connected to another electrical potential, which has an electrical counterpotential to the electrical potential of the charging electrode 19 in Fig. 1 or the charging electrode 25 in Fig. 2 forms.
  • first guide roller 13 in Fig. 1 or second guide roller 24 in Fig. 2 defines in each case a second area (measuring area), in which the first deflecting roller 13 in FIG Fig. 1 or second guide roller 24 in Fig. 2 is preferably connected to ground potential, but instead may also be connected to another electrical potential, which forms an electrical counter potential to the electric potential of the charging layer on the adjacent side of the sheet material 11 and 21, respectively.
  • guide rollers 13 and / or 14 in Fig. 1 as well as 23 and / or 24 in Fig. 2 may also other the sheet material or 21 contacting or non-contacting, but in the vicinity adjacent to the sheet material arranged rolls or rollers or non-rotating elements, for. As sliding contacts or non-contact plates or electrodes are used (so close that the electrical effect described occurs).
  • a non-rotating electrically conductive element is provided, which does not contact the sheet material 11 or 21.
  • first deflecting roller 13 in FIG Fig. 1 or a second guide roller 24 in Fig. 2 it is advantageous to have a first deflecting roller 13 in FIG Fig. 1 or a second guide roller 24 in Fig. 2 or to use another roller or roller, which contacts the sheet material 11 or 21, but instead of a flat material 11 or 21 not contacting, but arranged close to the sheet material element may be used instead.
  • Example 30 of Fig. 3 corresponds functionally to Example 10 of Fig. 1 , The same elements are provided, with the exception that in Fig. 3 a roller 313 instead of the guide roller 13, and a sheet material 11 non-contacting element 314 instead of the guide roller 14 are provided.
  • the embodiment 40 of Fig. 4 corresponds functionally to Example 20 of Fig. 2 , The same elements are provided, with the exception that in Fig. 4 a roller 424 instead of the guide roller 24, and a sheet material non-contacting element 423 instead of the guide roller 23 are provided.
  • a non-contacting electrically conductive member 314 or 423 in the first region (neutralization region) or a non-contacting electrically conductive element is used instead of the deflecting rollers 13, 24, 313 or 424 in the second region (measuring region), it is preferably so as close as possible to the sheet material 11 or 21 (which may be a wobbling or fluttering web), e.g. B. with a distance between 2 mm and 20 mm.
  • a conductive element (counterelectrode) 14, 23, 314 or 423 is arranged opposite the charging electrode 19 or 29 on its side facing away from the sheet material 11 or 21, then its to the charging electrode facing Side preferably small, z.
  • the element can, for. As a wire or rope with an electrically conductive surface.

Landscapes

  • Elimination Of Static Electricity (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)

Claims (7)

  1. Dispositif (40) pour l'élimination sans contact d'une double couche de charge électrostatique d'un matériau (21) plan transporté, sensiblement électriquement isolant, comprenant :
    - un dispositif de compensation (29) sans contact disposé dans une première zone (zone de neutralisation) adjacente au matériau plan pour délivrer des porteurs de charge sur un côté du matériau plan dans la première zone afin d'effectuer une compensation au moins partielle des charges au moins dans un plan de couche de la double couche de charge ;
    dans lequel le dispositif de compensation comporte lui-même une électrode de charge (29) reliée à une source à haute tension, qui est opposée à un premier élément conducteur (423) par rapport au côté du matériau plan et qui délivre au matériau des ions de gaz et des électrons libres ;
    - un second élément électriquement conducteur (424) adjacent au matériau plan (21) dans une seconde zone (zone de mesure), qui établit un contre-potentiel électrique par rapport au potentiel électrique de la couche de charge sur la surface opposée du matériau plan,
    afin de former un champ proche électrique émanant du côté tourné à l'opposé de ladite surface ; et
    - un dispositif de mesure d'intensité de champ (25) associé à la seconde zone et destiné à détecter l'intensité de champ du champ proche ;
    dans lequel le dispositif de compensation (29) est relié en entrée au dispositif de mesure d'intensité de champ (25) et est conçu pour délivrer de manière commandée des porteurs de charge au matériau sur la base du résultat de la détection, et dans lequel la seconde zone est espacée de la première zone du matériau plan tel qu'il est vu dans la direction de déplacement (22) ;
    dans lequel, dans la première zone, le premier élément électriquement conducteur (423) est un élément non tournant qui n'est pas en contact avec le matériau plan (21) et qui est disposé de manière adjacente au matériau plan du côté du matériau plan qui est tourné à l'opposé du dispositif de compensation afin de former un champ proche électrique ;
    dans lequel, dans la seconde zone, le second élément électriquement conducteur est un élément tournant (424) qui est en contact avec le matériau plan (21),
    et dans lequel il est prévu des électrodes de décharge (31) en aval de l'élément tournant (424) pour éliminer l'éventuelle charge unipolaire restante sur les deux surfaces de la bande de matériau (21).
  2. Dispositif selon la revendication 1, caractérisé en ce que la seconde zone est disposée en aval de la première zone dans la direction de transport du matériau.
  3. Dispositif selon la revendication 1, caractérisé en ce que la seconde zone (424) est disposée en aval de la première zone (423) dans la direction de transport du matériau (21) et en ce que la commande de la délivrance des porteurs de charge est réalisée sous la forme d'un dispositif de régulation.
  4. Dispositif selon l'une des revendications précédentes, caractérisé en ce que le dispositif de compensation (26-29) est conçu pour délivrer des porteurs de charge sélectivement positifs ou négatifs en réaction au résultat de la détection du dispositif de mesure d'intensité de champ.
  5. Dispositif selon l'une des revendications précédentes, caractérisé en ce que l'élément conducteur (424) de la seconde zone est réalisé sous la forme d'une surface conductrice d'un élément d'entraînement et/ou de guidage, en contact avec la bande de matériau, d'un dispositif de transport.
  6. Dispositif selon l'une des revendications précédentes, caractérisé en ce que l'élément conducteur (423, 424) de la première zone et/ou de la seconde zone est relié à la terre.
  7. Dispositif selon l'une des revendications précédentes, caractérisé en ce que l'électrode de charge (29) délivre des charges positives ou négatives au matériau.
EP06118255.6A 2005-12-21 2006-08-01 Appareil de décharge sans contact d'électricité statique d'une couche à double charge Not-in-force EP1802178B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005061332.2A DE102005061332B4 (de) 2005-12-21 2005-12-21 Vorrichtung zur kontaktlosen Beseitigung einer elektrostatischen Ladungsdoppelschicht
DE202006009823U DE202006009823U1 (de) 2005-12-21 2006-06-23 Vorrichtung zur kontaktlosen Beseitigung einer elektrostatischen Doppelladungsschicht

Publications (3)

Publication Number Publication Date
EP1802178A2 EP1802178A2 (fr) 2007-06-27
EP1802178A3 EP1802178A3 (fr) 2010-12-29
EP1802178B1 true EP1802178B1 (fr) 2019-05-22

Family

ID=37489978

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06118255.6A Not-in-force EP1802178B1 (fr) 2005-12-21 2006-08-01 Appareil de décharge sans contact d'électricité statique d'une couche à double charge

Country Status (2)

Country Link
EP (1) EP1802178B1 (fr)
DE (1) DE202006009823U1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007049529A1 (de) * 2007-10-15 2009-04-16 Eltex-Elektrostatik Gmbh Elektrodenvorrichtung
DK2086292T3 (da) 2008-01-31 2011-08-15 Ferag Ag Fremgangsmåde og indretning til elektrostatisk afladning af flersidede trykkeriprodukter
DE102010051668A1 (de) * 2010-11-17 2012-05-24 Li-Tec Battery Gmbh Verfahren und System zur Reinigung von blatt- oder plattenförmigen Objekten
JP7392520B2 (ja) * 2020-03-02 2023-12-06 東洋製罐グループホールディングス株式会社 除電装置及び除電方法
CN113406708B (zh) * 2021-06-18 2022-01-04 中国科学院地质与地球物理研究所 一种电磁法勘探电场测量用的电极极差消除系统及方法

Family Cites Families (5)

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Publication number Priority date Publication date Assignee Title
DE4224698C2 (de) * 1992-07-25 1995-08-24 Kodak Ag Verfahren und Anordnung zur Messung und kontrollierten Neutralisierung von Oberflächenladungen auf Gegenständen
DE10023939A1 (de) * 2000-05-17 2001-11-22 Heidelberger Druckmasch Ag Vorrichtung zum Entfernen elektrischer Ladungen von flachem Material
US6674630B1 (en) * 2001-09-06 2004-01-06 Ion Systems, Inc. Simultaneous neutralization and monitoring of charge on moving material
US7095600B2 (en) * 2002-10-30 2006-08-22 Eastman Kodak Company Electrostatic charge neutralization using grooved roller surface patterns
DE10354168A1 (de) * 2003-11-19 2005-06-23 Eltex-Elektrostatik Gmbh Vorrichtung zur Beseitigung von Ladungen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP1802178A3 (fr) 2010-12-29
EP1802178A2 (fr) 2007-06-27
DE202006009823U1 (de) 2006-11-16

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