EP0971851A1 - Method and device for electrostatic charging - Google Patents

Method and device for electrostatic charging

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Publication number
EP0971851A1
EP0971851A1 EP98917100A EP98917100A EP0971851A1 EP 0971851 A1 EP0971851 A1 EP 0971851A1 EP 98917100 A EP98917100 A EP 98917100A EP 98917100 A EP98917100 A EP 98917100A EP 0971851 A1 EP0971851 A1 EP 0971851A1
Authority
EP
European Patent Office
Prior art keywords
roller
shaft
material web
charging
rollers
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.)
Granted
Application number
EP98917100A
Other languages
German (de)
French (fr)
Other versions
EP0971851B1 (en
Inventor
Ernst August Hahne
Hermann Künzig
Franz Knopf
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
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Application filed by Eltex Elektrostatik GmbH filed Critical Eltex Elektrostatik GmbH
Publication of EP0971851A1 publication Critical patent/EP0971851A1/en
Application granted granted Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H27/00—Special constructions, e.g. surface features, of feed or guide rollers for webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/50—Auxiliary process performed during handling process
    • B65H2301/51—Modifying a characteristic of handled material
    • B65H2301/513—Modifying electric properties
    • B65H2301/5132—Bringing electrostatic charge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/10—Rollers
    • B65H2404/14—Roller pairs
    • B65H2404/145—Roller pairs other
    • B65H2404/1451—Pressure

Definitions

  • the invention relates to a method and a device for electrostatically charging the two outer sides of at least one material web with charges of opposite polarity, before the further processing of the at least one material web, which is guided through the gap of a pair parallel to one another and at a short distance from one another.
  • Such a method and a device for electrostatic charging are known (DE-31 17 419 AI).
  • several material webs are brought together to form a strand and only the two outer sides are charged by means of a device designed as a corona charging electrodes for electrostatic charging after the first pair of rollers by means of a high-voltage source of 30 kV.
  • a disadvantage of this known device is the spatially not very targeted charging of the two outer sides of the material webs. A large part of the charged particles vagabundate in the entire area where the charging takes place. This results in poor charging efficiency. There is also a risk that in the case of unfavorable Environmental conditions contaminate the corona charging electrodes and consequently fail to function. The cleaning effort can be very considerable.
  • the invention has for its object to propose a generic method and a generic device, by means of which a more targeted charging with better efficiency is possible.
  • the roller can be charged over the surface by means of a so-called contact roller (DE-38 23 739 AI), via brushes known per se, a sliding contact or a corona charging electrode.
  • a so-called contact roller DE-38 23 739 AI
  • brushes known per se a sliding contact or a corona charging electrode.
  • the charging is carried out from the inside by the device formed by the pair of rollers, each roller having a limited electrically conductive (so-called semiconducting) coating over a steel jacket and - for electrically charging the limited conductive coating -
  • the steel jacket of each roller can be connected to a positive or negative high voltage source.
  • the device according to the invention because of the supply of the voltage from the inside, it is also possible in particular to retrofit it in existing systems for processing material webs, preferably made of plastic or paper, with a high-voltage source of 3 to 7 kV. Thus, significantly lower voltages are also used with reference to the prior art.
  • the axis or shaft of the roller is expediently connected to the steel jacket in an electrically conductive manner and is electrically insulated from the machine frame for the roller.
  • the electrical high voltage is applied to the axle or shaft, which has a connection for this purpose. This can either be a fixed connection on the axle or a thrust bearing to be arranged on the end face of the shaft.
  • a primary coil with respect to the machine frame is fixed concentrically to the axis or shaft of the roller and concentrically with the axis or shaft of the roller on one end face of which a secondary coil is fixedly attached to this and that one of which is connected to the axle or shaft and the other of which is connected to the steel jacket via a rectifier circuit.
  • roller for the purpose of insulation from the machine frame under the highly conductive steel jacket and on both of them End faces has an electrical insulator and the high voltage of the high voltage source is applied via a corona charging electrode for electrically charging the limited conductive coating.
  • a corona charging electrode for electrically charging the limited conductive coating.
  • FIG. 1 shows a first embodiment of the device according to the invention, in a schematic cross section and a partially broken view
  • Figure 2 shows a second embodiment of the device according to the invention, in schematic cross section and partially broken simplified representation
  • FIG. 3 shows a third embodiment of the device according to the invention, in a simplified representation partly broken away and broken away;
  • Figure 4 shows a fourth embodiment of the device according to the invention, in a partially broken and broken away, simplified representation.
  • Each of the two rollers 5 according to FIG. 1 has one 1 in the first embodiment according to FIG. 1 as well as a steel jacket 7, over which a surface with limited conductivity, designated as 8, is arranged, which is electrically chargeable. Between the axis 6 and the steel jacket 7, a ball bearing, generally designated 9, is provided. A gap 50 is present between the two rollers arranged parallel to one another.
  • the axis of the roller 5 is mounted in a machine stand, generally designated 10, in an electrical insulation, generally designated 11.
  • the distances 12 and 13 are sufficient to prevent discharges or voltage flashovers.
  • the end face 16 of the axis 6 is connected to a generator denoted overall by 15 and a measuring device 16 having a connection 17, the line leading to the connection 17 being grounded via a resistor 18.
  • the machine stand 10 is also grounded, as indicated schematically at 19.
  • FIG. 2 differs from that according to FIG. 1, as only one of the two rollers is shown and the axis 6 there is now designed as a shaft 20 which is rigidly connected to the steel jacket 7 via an electrically conductive intermediate piece 21.
  • the shaft 20 of the machine stand 10 is connected either via an electrically insulating ball bearing 22 or a separate insulation 11. It is also possible to use a normal, electrically conductive ball bearing and to provide an electrically insulating sleeve 11 between it and the machine stand 10. Furthermore, on the end face 14 of the shaft 20, a pressure bearing, designated overall by 23, is provided as a connection, which is electrically conductive and on the outside of which the connection 17 of the high-voltage generator 15 is attached via the measuring device 16.
  • Machine room 10 can get because of the electrical insulation 11, on the other hand, the high voltage can reach the limited conductive coating 8 of the roller 5 from the inside.
  • the further, third embodiment according to FIG. 3 also has two rollers with the formation of a gap, of which, however, for reasons of better clarity, only one roller as shown in FIGS. 1 and 2 is shown. Furthermore, concentric to the shaft 6 of the roller 5, in addition to the latter on the one end face 112, there is a first receiving device, generally designated 113, as a magnetizable core with a secondary coil 114 and a second secondary coil 115, each concentric to the shaft 6.
  • a further receiving device 116 is arranged concentrically with the shaft 6 as a magnetizable core for receiving a primary coil 117 with electrical connections 1 and 2, which is also concentric with the shaft 6, and a second primary coil 18 with electrical connections 3 and 4 arranged between the latter and the shaft 6.
  • the receiving device 16 can be rotated with respect to the shaft 6 by means of a pin 19 which engages in an anchorage 120 which is fixed with respect to the machine frame and has an overall joint on its inside 121 designated ball bearing so that it can rotate, but the magnetizable core due to the pin 119 and the anchor 120 with respect to the first receiving device 113 can be held against rotation.
  • a rectifier circuit 122 and a smoothing circuit 123 are also provided on the secondary side of the first receiving device 113, and their output is connected to the limited conductive coating 8.
  • the electrical connection 2 of the primary coil 117 is grounded, whereas the electrical connection 1 can be connected to an AC voltage generator.
  • the two electrical connections 3 and 4 of the second primary coil 118 can be connected to the inputs of a control circuit which can change the size of the output voltage and / or its frequency - in a manner known per se.
  • the secondary coil 114 is grounded on one side. The same also applies to the second secondary coil 115. Both secondary coils 114, 115 are connected in parallel.
  • the rectifier circuit 122 for rectifying the alternating current is initially arranged downstream of both coils. After the rectifier circuit 122 is the smoothing circuit 123, e.g. arranged in the form of an LC filter, as known per se. The output of the smoothing circuit 123 is connected to the limited conductive coating 8 of the roller 5.
  • the secondary coil 114 is moved relative to the primary coil 117. Via the air gap between the two magnetizable cores of the receiving device 113 and 116, the alternating voltage of the primary coil 117 can induce a secondary voltage in the secondary coil 114 which is rectified via the rectifier circuit 122 and the smoothing circuit 123 to the limitedly conductive "covering 8 is fed smoothed directly.
  • the induced voltage of the secondary coil 114 is taken by the second secondary coil 115 and induced in the second primary coil 118 in the reverse sense, with their electrical connections 3 and 4 to a control circuit can be connected, which can control the AC voltage source in such a way that the same direct voltage is always applied to the limited conductive coating 8 of the roller 5.
  • the embodiment according to FIG. 4 differs from the previous versions in that the shaft or axis 6 or 20 of the machine frame 10 is arranged directly through an electrical insulator layer 40 under the steel jacket 7 of the roller 5.
  • this electrical insulator extends on the two end faces 41 as an end insulator layer 42 which extends in the radial direction at least up to the layer 40 which is concentric with respect to the axis, shaft 6 or 20. However, it can also extend to the outer edge.
  • a high-voltage source 43 is provided, the output of which is connected to a corona charging electrode, denoted overall by 44, which extends in the axial direction over a short axial region, essentially parallel to the shaft or axis 6, 20, and the limited conductive coating 8 is opposite.
  • a charge is created which is distributed evenly over the entire surface due to the highly conductive steel jacket 7 arranged beneath it, so that the limited conductive coating 8 can serve to charge the material web.
  • the roller can also be designed as an impression roller in a gravure printing unit in order to do so to form the electrostatic pressure support.

Landscapes

  • Elimination Of Static Electricity (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Current-Collector Devices For Electrically Propelled Vehicles (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

PCT No. PCT/EP97/06387 Sec. 371 Date Aug. 9, 1998 Sec. 102(e) Date Aug. 9, 1998 PCT Filed Nov. 16, 1997 PCT Pub. No. WO98/43904 PCT Pub. Date Oct. 8, 1998The invention relates to a method for electrostatic charging of the two outer sides of at least one material web with charges of opposite polarity, prior to the further processing of the at least one material web, with the web being guided through the nip of a pair of rollers that are parallel to one another and are arranged with a short space between them, characterized in that the electrostatic charging of the two outer sides of the at least one material web is performed by the rollers in the nip between them.

Description

VERFAHREN UND VORRICHTUNG ZUM ELEKTROSTATISCHEN METHOD AND DEVICE FOR ELECTROSTATIC
AUFLADENCHARGE
Die Erfindung betrifft ein Verfahren sowie eine Vorrichtung zum elektrostatischen Aufladen der beiden Außenseiten von zumindest einer Materialbahn mit Ladungen entgegengesetzter Polarität, vor dem Weiterverarbeiten der zumindest einen Materialbahn, wobei diese durch den Spalt eines Paares zueinander parallel und mit geringem Abstand zueinander angeordneter Walzen geführt ist.The invention relates to a method and a device for electrostatically charging the two outer sides of at least one material web with charges of opposite polarity, before the further processing of the at least one material web, which is guided through the gap of a pair parallel to one another and at a short distance from one another.
Ein solches Verfahren sowie eine Vorrichtung zum elektrostatischen Aufladen sind bekannt (DE-31 17 419 AI) . Hierbei werden mehrere Materialbahnen zu einem Strang zusammengeführt und nur die beiden Außenseiten mittels einer als Korona-Aufladeelektroden ausgebildeten Vorrichtung zum elektrostatischen Aufladen nach dem ersten Paar von Walzen mittels einer Hochspannungsquelle von 30 kV aufgeladen.Such a method and a device for electrostatic charging are known (DE-31 17 419 AI). Here, several material webs are brought together to form a strand and only the two outer sides are charged by means of a device designed as a corona charging electrodes for electrostatic charging after the first pair of rollers by means of a high-voltage source of 30 kV.
Von Nachteil bei dieser bekannten Vorrichtung ist die räumlich nicht sehr gezielte Aufladung der beiden Außenseiten der Materialbahnen. So vagabundiert ein Großteil der aufgeladenen Teilchen im gesamten Bereich, wo die Aufladung stattfindet. Hieraus resultiert ein schlechter Wirkungsgrad bei der Aufladung. Außerdem besteht die Gefahr, daß bei ungünstigen Umgebungsbedingungen die Korona-Aufladeelektroden verschmutzen und ihren Dienst demzufolge versagen. Der Putzaufwand kann sehr beträchtlich sein.A disadvantage of this known device is the spatially not very targeted charging of the two outer sides of the material webs. A large part of the charged particles vagabundate in the entire area where the charging takes place. This results in poor charging efficiency. There is also a risk that in the case of unfavorable Environmental conditions contaminate the corona charging electrodes and consequently fail to function. The cleaning effort can be very considerable.
Der Erfindung liegt die Aufgabe zugrunde, ein gattungsgemäßes Verfahren sowie eine gattungsgemäße Vorrichtung vorzuschlagen, mittels denen ein gezielteres Aufladen mit besserem Wirkungsgrad möglich ist.The invention has for its object to propose a generic method and a generic device, by means of which a more targeted charging with better efficiency is possible.
Diese Aufgabe wird bei dem gattungsgemäßen Verfahren erfindungsgemäß dadurch gelöst, daß die elektrostatische ungleichnamige Aufladung der beiden Außenseiten der zumindest einen Materialbahn über jede Walze des Paars in dem Spalt erfolgt.This object is achieved in the generic method according to the invention in that the electrostatic charging of the same name of the two outer sides of the at least one material web takes place over each roller of the pair in the gap.
Hierbei kann die Aufladung der Walze über die Oberfläche und zwar mittels einer sogenannten Kontaktwalze (DE- 38 23 739 AI) , über ansich bekannte Streichbürsten, einen Schleifkontakt oder eine Koronaaufladungselektrode erfolgen.In this case, the roller can be charged over the surface by means of a so-called contact roller (DE-38 23 739 AI), via brushes known per se, a sliding contact or a corona charging electrode.
In zweckmäßiger Weiterbildung wird bei der gattungsgemäßen Vorrichtung jedoch erfindungsgemäß die Aufladung durch die von dem Paar Walzen gebildete Vorrichtung von innen her durchgeführt, wobei jede Walze über einem Stahlmantel einen begrenzt elektrisch leitfähigen (sogenannten halbleitenden) Belag aufweist und - zum elektrischen Aufladen des begrenzt leitfähigen Belages - der Stahlmantel jeder Walze an eine positive bzw. negative Hochspannungsquelle anschließbar ist. Bei der erfindungsgemäßen Vorrichtung ist wegen der Zuführung der Spannung von innen her auch insbesondere der nachträgliche Einbau in vorhandenen Anlagen zur Verarbeitung von Materialbahnen, vorzugsweise aus Kunststoff oder Papier bei einer Hochspannungsquelle von 3 bis 7 kV möglich. Somit wird auch mit Bezug auf den Stand der Technik mit beträchtlich geringeren Spannungen gearbeitet. Außerdem erfolgt die Aufladung genau an jener aufzuladenden Stelle, nämlich an den Außenseiten der zumindest einen Materialbahn, wodurch sich ein im Vergleich zum Stand der Technik erheblich besserer Wirkungsgrad ergibt. Schließlich ist wegen des Fortfalls von Korona-Aufladeelektroden ein Reinigungsaufwand für diese vollständig entbehrlich, so daß sich auch im Betrieb geringere Kosten wegen Stillstandzeiten der Anlage ergeben.In an expedient development, in the generic device, however, the charging is carried out from the inside by the device formed by the pair of rollers, each roller having a limited electrically conductive (so-called semiconducting) coating over a steel jacket and - for electrically charging the limited conductive coating - The steel jacket of each roller can be connected to a positive or negative high voltage source. In the device according to the invention, because of the supply of the voltage from the inside, it is also possible in particular to retrofit it in existing systems for processing material webs, preferably made of plastic or paper, with a high-voltage source of 3 to 7 kV. Thus, significantly lower voltages are also used with reference to the prior art. In addition, the charging takes place precisely at that point to be charged, namely on the outer sides of the at least one material web, which results in an efficiency which is considerably better than in the prior art. Finally, due to the elimination of corona charging electrodes, there is no need to clean them, so that there are also lower costs in operation due to downtimes of the system.
Zweckmäßig ist bei der Erfindung die Achse oder Welle der Walze elektrisch leitend mit dem Stahlmantel verbunden und von dem Maschinenrahmen für die Walze elektrisch isoliert. Zum elektrischen Aufladen des begrenzt leitfähigen Belages wird die elektrische Hochspannung an die Achse oder Welle gelegt, die zu diesem Zweck einen Anschluß aufweist. Dieser kann entweder ein fester Anschluß an der Achse oder als ein an der Stirnseite der Welle anzuordnendes Drucklager ausgebildet sein.In the case of the invention, the axis or shaft of the roller is expediently connected to the steel jacket in an electrically conductive manner and is electrically insulated from the machine frame for the roller. To electrically charge the limited conductive covering, the electrical high voltage is applied to the axle or shaft, which has a connection for this purpose. This can either be a fixed connection on the axle or a thrust bearing to be arranged on the end face of the shaft.
In vorteilhafter Weiterbildung der Erfindung ist es auch möglich, daß konzentrisch zu der Achse oder Welle der Walze neben dieser eine Primärspule bezüglich des Maschinenrahmens fest und konzentrisch zu der Achse oder Welle der Walze an dessen einer Stirnseite eine Sekundärspule mit dieser umlaufend fest angebracht ist und daß deren einer Anschluß an die Achse oder Welle und deren anderer Anschluß über eine Gleichrichterschaltung an dem Stahlmantel angeschlossen ist .In an advantageous development of the invention, it is also possible that a primary coil with respect to the machine frame is fixed concentrically to the axis or shaft of the roller and concentrically with the axis or shaft of the roller on one end face of which a secondary coil is fixedly attached to this and that one of which is connected to the axle or shaft and the other of which is connected to the steel jacket via a rectifier circuit.
Es ist aber auch möglich, daß die Walze zum Zweck der Isolation von dem Maschinenrahmen unter dem hochleitfähigen Stahlmantel sowie an ihren beiden Stirnseiten einen elektrischen Isolator aufweist und zum elektrischen Aufladen des begrenzt leitfähigen Belages die Hochspannung der Hochspannungsquelle über eine Korona-Aufladungselektrode aufgebracht wird. Eine solche Walze kann auch als Presseur im Tiefdruckverfahren Einsatz finden.But it is also possible that the roller for the purpose of insulation from the machine frame under the highly conductive steel jacket and on both of them End faces has an electrical insulator and the high voltage of the high voltage source is applied via a corona charging electrode for electrically charging the limited conductive coating. Such a roller can also be used as an impression in the gravure printing process.
Weitere Ausgestaltungen der Erfindung sind in den restlichen Unteransprüchen gekennzeichnet.Further refinements of the invention are characterized in the remaining subclaims.
Vier Ausführungsbeispiele der Erfindung werden nachfolgend unter Bezugnahme auf die Zeichnung näher erläutert. In dieser zeigt :Four exemplary embodiments of the invention are explained in more detail below with reference to the drawing. In this shows:
Figur 1 eine erste Ausführungsform der erfindungs- gemäßen Vorrichtung, im schematischen Querschnitt und teilweise abgebrochener Darstellung;FIG. 1 shows a first embodiment of the device according to the invention, in a schematic cross section and a partially broken view;
Figur 2 eine zweite Ausführungsform der erfindungsgemäßen Vorrichtung, im schematischen Querschnitt und teilweise abgebrochener vereinfachter Darstellung;Figure 2 shows a second embodiment of the device according to the invention, in schematic cross section and partially broken simplified representation;
Figur 3 eine.dritte Ausführungsform der erfindungsgemäßen Vorrichtung, in teilweise ab- und ausgebrochener vereinfachter Darstellung; undFIG. 3 shows a third embodiment of the device according to the invention, in a simplified representation partly broken away and broken away; and
Figur 4 eine vierte Ausführungsform der erfindungsgemäßen Vorrichtung, in teilweise ab- und ausgebrochener, vereinfachter Darstellung.Figure 4 shows a fourth embodiment of the device according to the invention, in a partially broken and broken away, simplified representation.
Jede der beiden Walzen 5 gemäß Fig. 1 weist eine feststehende Achse 6 in der ersten Ausführungsform gemäß Fig. 1 sowie einen Stahlmantel 7 auf, über dem insgesamt mit 8 bezeichneter, begrenzt leitfähiger Belag als Oberfläche angeordnet ist, welcher elektrisch aufladbar ist. Zwischen der Achse 6 und dem Stahlmantel 7 ist ein insgesamt mit 9 bezeichnetes Kugellager vorgesehen. Zwischen den beiden parallel zueinander angeordneten Walzen ist ein Spalt 50 vorhanden.Each of the two rollers 5 according to FIG. 1 has one 1 in the first embodiment according to FIG. 1 as well as a steel jacket 7, over which a surface with limited conductivity, designated as 8, is arranged, which is electrically chargeable. Between the axis 6 and the steel jacket 7, a ball bearing, generally designated 9, is provided. A gap 50 is present between the two rollers arranged parallel to one another.
Die Achse der Walze 5 ist in einem insgesamt mit 10 bezeichneten Maschinenständer in einer insgesamt mit 11 bezeichneten elektrischen Isolierung gelagert. Die Abstände 12 und 13 sind ausreichend, um Entladungen oder Spannungsüberschläge zu verhindern.The axis of the roller 5 is mounted in a machine stand, generally designated 10, in an electrical insulation, generally designated 11. The distances 12 and 13 are sufficient to prevent discharges or voltage flashovers.
Die Stirnseite 16 der Achse 6 ist mit einem insgesamt mit 15 bezeichneten Generator und einer Meßeinrichtung 16 mit einem Anschluß 17 angeschlossen, wobei die zu dem Anschluß 17 führende Leitung über einen Widerstand 18 geerdet ist. Der Maschinenständer 10 ist, wie schematisch mit 19 bezeichnet, ebenfalls geerdet.The end face 16 of the axis 6 is connected to a generator denoted overall by 15 and a measuring device 16 having a connection 17, the line leading to the connection 17 being grounded via a resistor 18. The machine stand 10 is also grounded, as indicated schematically at 19.
Das Ausführungsbeispiel gemäß Fig. 2 unterscheidet sich von jenem gemäß Fig. 1, als nur eine der beiden Walzen gezeigt und die dortige Achse 6 nunmehr als Welle 20 ausgebildet ist, die starr über ein elektrisch leitendes Zwischenstück 21 mit dem Stahlmantel 7 verbunden ist.The embodiment according to FIG. 2 differs from that according to FIG. 1, as only one of the two rollers is shown and the axis 6 there is now designed as a shaft 20 which is rigidly connected to the steel jacket 7 via an electrically conductive intermediate piece 21.
Dafür ist die Welle 20 vom Maschinenständer 10 entweder über ein elektrisch isolierendes Kugellager 22 oder eine gesonderte Isolierung 11 verbunden. Es ist auch möglich, ein normales, elektrisch leitendes Kugellager zu verwenden und zwischen diesem und dem Maschinenständer 10 eine elektrisch isolierende Hülse 11 vorzusehen. Ferner ist an der Stirnseite 14 der Welle 20 ein insgesamt mit 23 bezeichnetes Drucklager als Anschluß vorgesehen, welches elektrisch leitend ist und an dessen Außenseite der Anschluß 17 des Hochspannungsgenerators 15 über die Meßeinrichtung 16 angebracht ist.For this purpose, the shaft 20 of the machine stand 10 is connected either via an electrically insulating ball bearing 22 or a separate insulation 11. It is also possible to use a normal, electrically conductive ball bearing and to provide an electrically insulating sleeve 11 between it and the machine stand 10. Furthermore, on the end face 14 of the shaft 20, a pressure bearing, designated overall by 23, is provided as a connection, which is electrically conductive and on the outside of which the connection 17 of the high-voltage generator 15 is attached via the measuring device 16.
Bei beiden Ausführungsformen gemäß Fig. 1 und 2 ist sichergestellt, daß die über die Achse 6 oder Welle 20 angelegte Hochspannung einerseits nicht in denIn both embodiments according to FIGS. 1 and 2, it is ensured that the high voltage applied via the axis 6 or shaft 20, on the one hand, does not fall into the
Maschinenraum 10 wegen der elektrischen Isolierung 11 gelangen kann, andererseits die Hochspannung auf den begrenzt leitfähigen Belag 8 der Walze 5 von innen her gelangen kann.Machine room 10 can get because of the electrical insulation 11, on the other hand, the high voltage can reach the limited conductive coating 8 of the roller 5 from the inside.
Die weitere, dritte Ausführungsform gemäß Fig. 3 weist auch zwei Walzen unter Bildung eines Spaltes auf, von denen aber aus Gründen der besseren Übersicht nur eine Walze wie jene auf, wie sie in den Fig. 1 und 2 beschrieben sind, gezeigt ist. Ferner ist konzentrisch zur Welle 6 der Walze 5 neben dieser auf der einen Stirnseite 112 eine insgesamt mit 113 bezeichnete erste Aufnahmevorrichtung als magnetisierbarer Kern mit einer Sekundärspule 114 sowie eine zweite Sekundärspule 115 jeweils konzentrisch zur Welle 6 angeordnet.The further, third embodiment according to FIG. 3 also has two rollers with the formation of a gap, of which, however, for reasons of better clarity, only one roller as shown in FIGS. 1 and 2 is shown. Furthermore, concentric to the shaft 6 of the roller 5, in addition to the latter on the one end face 112, there is a first receiving device, generally designated 113, as a magnetizable core with a secondary coil 114 and a second secondary coil 115, each concentric to the shaft 6.
Konzentrisch zu der Welle 6 ist eine weitere Aufnahmevorrichtung 116 als magnetisierbarer Kern zur Aufnahme einer ebenfalls zur Welle 6 konzentrischen Primärspule 117 mit elektrischen Anschlüssen 1 und 2 sowie eine zwischen dieser und der Welle 6 angeordneten zweiten Primärspule 18 mit elektrischen Anschlüssen 3 und 4 angeordnet. Die Aufnahmevorrichtung 16 ist mittels eines Zapfens 19, der in eine bezüglich des Maschinenrahmens feste Verankerung 120 eingreift, bezüglich der Welle 6 drehbar und weist auf seiner Innenseite ein insgesamt mit 121 bezeichnetes Kugellager auf, so daß sich diese zwar drehen kann, der magnetisierbare Kern jedoch infolge des Zapfens 119 und der Verankerung 120 bezüglich der ersten Aufnahmeeinrichtung 113 drehfest - gehalten werden kann.A further receiving device 116 is arranged concentrically with the shaft 6 as a magnetizable core for receiving a primary coil 117 with electrical connections 1 and 2, which is also concentric with the shaft 6, and a second primary coil 18 with electrical connections 3 and 4 arranged between the latter and the shaft 6. The receiving device 16 can be rotated with respect to the shaft 6 by means of a pin 19 which engages in an anchorage 120 which is fixed with respect to the machine frame and has an overall joint on its inside 121 designated ball bearing so that it can rotate, but the magnetizable core due to the pin 119 and the anchor 120 with respect to the first receiving device 113 can be held against rotation.
Auf der Sekundärseite der ersten Aufnahmevorrichtung 113 ist ferner noch eine Gleichrichterschaltung 122 sowie eine Glättungsschaltung 123 vorgesehen, die mit ihrem Ausgang mit dem begrenzt leitfähigen Belag 8 verbunden ist.A rectifier circuit 122 and a smoothing circuit 123 are also provided on the secondary side of the first receiving device 113, and their output is connected to the limited conductive coating 8.
Der elektrische Anschluß 2 der Primärspule 117 ist geerdet, wohingegen der elektrische Anschluß 1 an einen Wechselspannungsgenerator anschließbar ist. Die beiden elektrischen Anschlüsse 3 und 4 der zweiten Primärspule 118 sind an die Eingänge einer RegelSchaltung anschließbar, welche die Größe der Ausgangsspannung und/oder deren Frequenz - in ansich bekannter Weise ändern kann .The electrical connection 2 of the primary coil 117 is grounded, whereas the electrical connection 1 can be connected to an AC voltage generator. The two electrical connections 3 and 4 of the second primary coil 118 can be connected to the inputs of a control circuit which can change the size of the output voltage and / or its frequency - in a manner known per se.
Die Sekundärspule 114 ist mit ihrer einen Seite geerdet. Dasselbe gilt auch für die zweite Sekundärspule 115. Beide Sekundärspulen 114, 115 sind parallel geschaltet. Beiden Spulen ist zunächst die Gleichrichterschaltung 122 zum Gleichrichten des Wechselstromes nachgeordnet. Hinter der Gleichrichterschaltung 122 ist die Glättungsschaltung 123, z.B. in Form eines LC-Filters, wie ansich bekannt, angeordnet. Der Ausgang der Glättungsschaltung 123 ist mit dem begrenzt leitfähigen Belag 8 der Walze 5 verbunden.The secondary coil 114 is grounded on one side. The same also applies to the second secondary coil 115. Both secondary coils 114, 115 are connected in parallel. The rectifier circuit 122 for rectifying the alternating current is initially arranged downstream of both coils. After the rectifier circuit 122 is the smoothing circuit 123, e.g. arranged in the form of an LC filter, as known per se. The output of the smoothing circuit 123 is connected to the limited conductive coating 8 of the roller 5.
Im Betrieb werden die Sekundärspule 114 gegenüber der Primärspule 117 bewegt. Über den Luftspalt zwischen den beiden magnetisierbaren Kernen der Aufnahmevorrichtung 113 und 116 kann also die WechselSpannung der Primärspule 117 eine Sekundärspannung in der Sekundärspule 114 induzieren, die über die Gleichrichterschaltung 122 gleichgerichtet und die Glättungsschaltung 123 geglättet direkt dem begrenzt leitfähigen " Belag 8 zugeführt wird. Die induzierte Spannung der Sekundärspule 114 wird durch die zweite Sekundärspule 115 abgenommen und auf die zweite Primärspule 118 im umgekehrten Sinne induziert, die mit ihren elektrischen Anschlüssen 3 und 4 an eine Regelschaltung anschließbar ist, welche die Wechselspannungsquelle dergestalt steuern kann, daß an dem begrenzt leitfähigen Belag 8 der Walze 5 stets die gleiche Gleichspannung anliegt.In operation, the secondary coil 114 is moved relative to the primary coil 117. Via the air gap between the two magnetizable cores of the receiving device 113 and 116, the alternating voltage of the primary coil 117 can induce a secondary voltage in the secondary coil 114 which is rectified via the rectifier circuit 122 and the smoothing circuit 123 to the limitedly conductive "covering 8 is fed smoothed directly. The induced voltage of the secondary coil 114 is taken by the second secondary coil 115 and induced in the second primary coil 118 in the reverse sense, with their electrical connections 3 and 4 to a control circuit can be connected, which can control the AC voltage source in such a way that the same direct voltage is always applied to the limited conductive coating 8 of the roller 5.
Die Ausführungsform gemäß Fig. 4 unterscheidet sich von den bisherigen Ausführungen dadurch, daß die Welle oder Achse 6 bzw. 20 vom Maschinenrahmen 10 direkt durch eine elektrische Isolatorschicht 40 unter dem Stahlmantel 7 der Walze 5 angeordnet ist. Außerdem erstreckt sich dieser elektrische Isolator an den beiden Stirnseiten 41 als stirnseitige Isolatorschicht 42, die sich in radialer Richtung mindestens bis zu der bezüglich der Achse, Welle 6 bzw. 20 konzentrischen Schicht 40 erstreckt. Sie kann jedoch auch bis zum äußeren Rand reichen.The embodiment according to FIG. 4 differs from the previous versions in that the shaft or axis 6 or 20 of the machine frame 10 is arranged directly through an electrical insulator layer 40 under the steel jacket 7 of the roller 5. In addition, this electrical insulator extends on the two end faces 41 as an end insulator layer 42 which extends in the radial direction at least up to the layer 40 which is concentric with respect to the axis, shaft 6 or 20. However, it can also extend to the outer edge.
Außerdem ist eine Hochspannungsquelle 43 vorgesehen, deren Ausgang mit einer insgesamt mit 44 bezeichneten Korona-Aufladungselektrode verbunden ist, die über einen kurzen axialen Bereich, im wesentlichen parallel zu der Welle bzw. Achse 6, 20 sich in axialer Richtung erstreckt und dem begrenzt leitfähigen Belag 8 gegenüberliegt. Gegenüber dem geerdeten Walzenkern 45 entsteht so eine Ladung, die aufgrund des darunter angeordneten hochleitfähigen Stahlmantels 7 auf der gesamten Oberfläche gleichmäßig verteilt wird, so daß der begrenzt leitfähige Belag 8 zur Aufladung der Materialbahn dienen kann. In zweckmäßiger Ausgestaltung kann die Walze auch als Presseur in einem Tiefdruckwerk ausgebildet sein, um damit die elektrostatische Druckunterstützung zu bilden. In addition, a high-voltage source 43 is provided, the output of which is connected to a corona charging electrode, denoted overall by 44, which extends in the axial direction over a short axial region, essentially parallel to the shaft or axis 6, 20, and the limited conductive coating 8 is opposite. Compared to the grounded roller core 45, a charge is created which is distributed evenly over the entire surface due to the highly conductive steel jacket 7 arranged beneath it, so that the limited conductive coating 8 can serve to charge the material web. In an expedient embodiment, the roller can also be designed as an impression roller in a gravure printing unit in order to do so to form the electrostatic pressure support.

Claims

A N S P R Ü C H E EXPECTATIONS
1. Verfahren zum elektrostatischen Aufladen der beiden Außenseiten von zumindest einer Materialbahn mit Ladung entgegengesetzer Polarität, vor dem Weiterverarbeiten der zumindest einen Materialbahn, wobei diese durch den Spalt eines Paars zueinander parallel und mit geringem Abstand zueinander angeordneter Walzen geführt ist,1. Method for electrostatically charging the two outer sides of at least one material web with charge of opposite polarity, before further processing the at least one material web, said web being guided through the gap of a pair parallel to one another and at a short distance from one another,
d a d u r c h g e k e n n z e i c h n e t ,characterized ,
daß die elektrostatische ungleichnamige Aufladung der beiden Außenseiten der zumindest einen Materialbahn über die Walzen in dem Spalt zwischen denselben erfolgt.that the electrostatic charging of the same name of the two outer sides of the at least one material web takes place over the rollers in the gap between them.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Walzen an die beiden Außenseiten der zumindest einen Materialbahn mit einstellbarer Kraft angedrückt sind.2. The method according to claim 1, characterized in that the rollers are pressed onto the two outer sides of the at least one material web with adjustable force.
3. Vorrichtung zum elektrostatischen Aufladen der beiden Außenseiten von zumindest einer Materialbahn mit Ladung entgegengesetzter Polarität, vor dem Weiterverarbeiten der zumindest einen Materialbahn, wobei diese durch den Spalt eines Paars zueinander parallel und mit geringem Abstand zueinander angeordneter Walzen (5) geführt ist, insbesondere nach Anspruch 1, dadurch gekennzeichnet, daß die Vorrichtung zum elektrostatischen Aufladen von dem Paar Walzen (5) gebildet ist, daß jede Walze über einem äußeren Stahlmantel (7) einen begrenzt elektrisch leitfähigen Belag (8) aufweist und daß zum elektrischen Aufladen des begrenzt leitfähigen Belags in dem Spalt (50) der Stahlmantel (7) jeder Walze (5) an eine positive bzw. negative Hochspannungsquelle anschließbar ist .3. Device for electrostatically charging the two outer sides of at least one material web with charge of opposite polarity, before further processing the at least one material web, which is guided through the gap of a pair of rollers (5) arranged parallel to one another and at a short distance from one another, in particular after Claim 1, characterized in that the device for electrostatic charging is formed by the pair of rollers (5), that each roller delimits one over an outer steel jacket (7) Has electrically conductive coating (8) and that for electrically charging the limited conductive coating in the gap (50), the steel jacket (7) of each roller (5) can be connected to a positive or negative high voltage source.
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die mit einer Achse (6) oder Welle (20) versehene Walze (5) in einem Maschinenrahmen (10) angeordnet ist und daß die Achse (6) oder die Welle (20) der Walze (5) elektrisch leitend mit dem Stahlmantel (7) verbunden und von dem Maschinenrahmen (10) elektrisch isoliert ist.4. Apparatus according to claim 3, characterized in that the roller (5) provided with an axis (6) or shaft (20) is arranged in a machine frame (10) and that the axis (6) or the shaft (20) of the Roller (5) is electrically conductively connected to the steel jacket (7) and is electrically insulated from the machine frame (10).
5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die elektrische Hochspannung über einen Anschluß anlegbar ist, der als ein an der Stirnseite (14) der Welle (20) angeordnetes Drucklager (23) ausgebildet ist.5. The device according to claim 4, characterized in that the electrical high voltage can be applied via a connection which is designed as a on the end face (14) of the shaft (20) arranged thrust bearing (23).
6. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß. konzentrisch zu der Achse oder Welle6. The device according to claim 3, characterized in that. concentric to the axis or shaft
(6) der Walze (5) neben dieser eine Primärspule (117) bezüglich des Maschinenrahmens (10, 120) fest angeordnet ist, daß konzentrisch zu der Achse oder Welle (6) der(6) the roller (5) next to this a primary coil (117) with respect to the machine frame (10, 120) is fixed that concentric to the axis or shaft (6) of the
Walze (5) an dessen einer Stirnseite (112) eineRoller (5) on one end face (112) one
Sekundärspule (114) mit dieser umlaufend fest angebracht ist und daß deren einer Anschluß an die Achse oder WelleSecondary coil (114) with this all around is firmly attached and that its a connection to the axle or shaft
(6) und deren Anschluß über eine Gleichrichterschaltung(6) and their connection via a rectifier circuit
(122) an den begrenzt leitfähigen Belag (8) angeschlossen ist . (122) is connected to the limited conductive covering (8).
7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß zwischen der Gleichrichterschaltung (122) und dem begrenzt leitfähigen Belag (8J eine Glättungsschaltung (123) für den pulsierenden Gleichstrom angeordnet ist .7. The device according to claim 6, characterized in that a smoothing circuit (123) for the pulsating direct current is arranged between the rectifier circuit (122) and the limited conductive coating (8J).
8. Vorrichtung nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß der Primärspule (117) eine zweite Primärspule (118) und der Sekundärspule (114) eine mit dieser umlaufende, zu dieser parallel geschaltete zweite Sekundärspule (115) zugeordnet ist, die der zweiten Primärspule (118) gegenüberliegt.8. Apparatus according to claim 6 or 7, characterized in that the primary coil (117) is assigned a second primary coil (118) and the secondary coil (114) is associated with a second secondary coil (115) which rotates with it and is connected in parallel therewith and which is associated with the second Primary coil (118) is opposite.
9. Vorrichtung nach einem der Ansprüche 3 bis 8, dadurch gekennzeichnet, daß die Größe des Spaltes (50) zwischen dem Walzen (5) einstellbar ist.9. Device according to one of claims 3 to 8, characterized in that the size of the gap (50) between the rollers (5) is adjustable.
10. Vorrichtung nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß die Walze (5) zum Isolieren von dem Maschinenrahmen (10) unter dem hochleitfähigen Stahlmantel (7) und an ihren beiden Stirnseiten einen elektrischen Isolator aufweist und daß zum elektrischen Aufladen des begrenzt leitfähigen Belages (8) die Hochspannungsquelle über eine Korona-Aufladungselektrode (44) aufgebracht wird.10. The device according to claim 3 or 4, characterized in that the roller (5) for insulating from the machine frame (10) under the highly conductive steel jacket (7) and on its two end faces has an electrical insulator and that for electrically charging the limited conductive Covering (8) the high voltage source is applied via a corona charging electrode (44).
11. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, daß die Walze (5) als Presseur für eine Tiefdruckanlage ausgebildt ist. 11. The device according to claim 10, characterized in that the roller (5) is designed as an impression roller for a gravure printing system.
EP98917100A 1997-04-02 1998-03-31 Device for electrostatic charging Revoked EP0971851B1 (en)

Applications Claiming Priority (3)

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DE19713662A DE19713662A1 (en) 1997-04-02 1997-04-02 Method and device for electrostatic charging
DE19713662 1997-04-02
PCT/EP1998/001855 WO1998043905A1 (en) 1997-04-02 1998-03-31 Method and device for electrostatic charging

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EP0971851A1 true EP0971851A1 (en) 2000-01-19
EP0971851B1 EP0971851B1 (en) 2001-12-12

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EP97950196A Expired - Lifetime EP0923500B1 (en) 1997-04-02 1997-11-16 Method and device for electrostatic charging
EP98917100A Revoked EP0971851B1 (en) 1997-04-02 1998-03-31 Device for electrostatic charging

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EP (2) EP0923500B1 (en)
JP (2) JP3258034B2 (en)
AT (2) ATE222210T1 (en)
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DK (1) DK0971851T3 (en)
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JP3258034B2 (en) 2002-02-18
DE59802440D1 (en) 2002-01-24
EP0923500B1 (en) 2002-08-14
DE59707978D1 (en) 2002-09-19
AU5322498A (en) 1998-10-22
DE19713662A1 (en) 1998-10-08
EP0971851B1 (en) 2001-12-12
JP2000509697A (en) 2000-08-02
ES2181044T3 (en) 2003-02-16
DK0971851T3 (en) 2002-04-08
ATE210593T1 (en) 2001-12-15
JP3284503B2 (en) 2002-05-20
ES2169509T3 (en) 2002-07-01
WO1998043905A1 (en) 1998-10-08
DE29723999U1 (en) 1999-12-09
AU736011B2 (en) 2001-07-26
EP0923500A1 (en) 1999-06-23
US6159555A (en) 2000-12-12
ATE222210T1 (en) 2002-08-15
AU7042598A (en) 1998-10-22
JP2000505032A (en) 2000-04-25
WO1998043904A1 (en) 1998-10-08
US6445562B1 (en) 2002-09-03

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