EP0971851B1 - Device for electrostatic charging - Google Patents

Device for electrostatic charging Download PDF

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Publication number
EP0971851B1
EP0971851B1 EP98917100A EP98917100A EP0971851B1 EP 0971851 B1 EP0971851 B1 EP 0971851B1 EP 98917100 A EP98917100 A EP 98917100A EP 98917100 A EP98917100 A EP 98917100A EP 0971851 B1 EP0971851 B1 EP 0971851B1
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EP
European Patent Office
Prior art keywords
roller
shaft
charging
limitedly
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.)
Revoked
Application number
EP98917100A
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German (de)
French (fr)
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EP0971851A1 (en
Inventor
Ernst August Hahne
Hermann Künzig
Franz Knopf
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Eltex Elektrostatik GmbH
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Eltex Elektrostatik GmbH
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Application filed by Eltex Elektrostatik GmbH filed Critical Eltex Elektrostatik GmbH
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    • 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 Device for electrostatically charging the two Outside of at least one material web with charges opposite polarity, before processing the at least one web of material, this through the gap of a pair parallel to each other and with a small distance mutually arranged rollers is guided.
  • Such a device for Electrostatic charging is known (DE-31 17 419 A1).
  • several material webs become one strand merged and only the two outer sides by means of one designed as a corona charging electrode
  • the invention is based on the object a Propose device by means of which a more targeted Charging with better efficiency is possible.
  • the roller can be charged via the surface by means of a so-called contact roller (DE-38 23 739 A1), via brushes known per se, one Slip contact or a corona charging electrode respectively.
  • the device according to the invention the charging by device formed from the pair of rollers from the inside performed, each roller over a steel jacket a limited electrically conductive (so-called semiconducting) covering and - for electrical Charging the limited conductive surface - the Steel jacket of each roller to a positive or negative High voltage source can be connected.
  • the device according to the invention is because of the supply of Tension from the inside, especially afterwards Installation in existing systems for processing Material webs, preferably made of plastic or paper possible with a high voltage source of 3 to 7 kV.
  • the axis or shaft of the invention is expedient Roller electrically connected to the steel jacket and electrically isolated from the machine frame for the roller.
  • the limited conductive covering becomes the electrical high voltage to the axis or shaft placed, which has a connection for this purpose.
  • This can either be a fixed connection to the axis or as one to be placed on the face of the shaft Thrust bearing be formed.
  • the roller has the purpose of Isolation from the machine frame under the highly conductive steel jacket as well as on both of them An electrical insulator on and to the front electrical charging of the limited conductive covering High voltage of the high voltage source over a direction extending essentially parallel to the roller Corona charging electrode applied.
  • Such The roller can also be used as an impression roller in the gravure printing process Find.
  • Each of the two rollers 5 according to FIG. 1 has one fixed axis 6 in the first embodiment according to Fig. 1 and a steel jacket 7, on the total designated 8, limited conductive coating as Surface is arranged, which is electrically chargeable is. Between the axis 6 and the steel jacket 7 is a provided with a total of 9 designated ball bearings. Between the two arranged parallel to each other There is a gap 50 between the rollers.
  • the axis of the roller 5 is 10 in total designated machine stand in a total of 11 designated electrical insulation stored.
  • the Distances 12 and 13 are sufficient to discharge or To prevent voltage flashovers.
  • the end face 14 of the axis 6 is with a total 15 designated generator and a measuring device 16 with connected to a terminal 17, which to the terminal 17 leading line is grounded via a resistor 18.
  • the machine stand 10 is, as schematically with 19 designated, also grounded.
  • the shaft 20 from the machine stand 10 is either via an electrically insulating ball bearing 22 or separate insulation 11 connected. It is also possible, to use a normal, electrically conductive ball bearing and between this and the machine stand 10 one to provide electrically insulating sleeve 11.
  • the further, third embodiment according to FIG. 3 has also two rollers to form a gap, from but only one for the sake of a better overview Roll up like those in Figs. 1 and 2 are described. It is also concentric to Wave 6 of the roller 5 next to this on one end face 112 a first designated 113 overall Recording device as a magnetizable core with a Secondary coil 114 and a second secondary coil 115 each arranged concentrically to the shaft 6.
  • the cradle 116 is. by means of a Pin 119, which in a with respect to the machine frame fixed anchoring 120 engages with respect to shaft 6 rotatable and has an overall on the inside 121 designated ball bearing, so that this is can rotate, but the magnetizable core due to the Pin 119 and the anchor 120 with respect to the first Recording device 113 can be held non-rotatably.
  • a rectifier circuit 122 On the secondary side of the first receiving device 113 is also a rectifier circuit 122 and a Smoothing circuit 123 provided with its 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 to one AC voltage generator can be connected.
  • the two electrical connections 3 and 4 of the second primary coil 118 are connected to the inputs of a control circuit connectable, which is the size of the output voltage and / or their frequency - in a manner known per se can change.
  • the secondary coil 114 is grounded on one side. The same applies to the second secondary coil 115. Both Secondary coils 114, 115 are connected in parallel. Both Coil is first the rectifier circuit 122 for Rectifying the AC downstream. Behind the Rectifier circuit 122 is smoothing circuit 123, e.g. in the form of an LC filter, as is known per se, arranged. The output of the smoothing circuit 123 is with the limited conductive coating 8 of the roller 5 connected.
  • the secondary coil 114 against the Primary coil 117 moves. Over the air gap between the two magnetizable cores of the holding device 113 and 116 can therefore the AC voltage of the primary coil 117 induce a secondary voltage in the secondary coil 114, which are rectified via the rectifier circuit 122 and the smoothing circuit 123 directly smoothes that limited conductive coating 8 is supplied.
  • the induced voltage of the secondary coil 114 is determined by the second - secondary coil 115 removed and on the second Primary coil 118 in the opposite sense induced with their electrical connections 3 and 4 to one Control circuit is connectable, which the Can control AC voltage source such that at the limited conductive coating 8 of the roller 5 always the same DC voltage is present.
  • the embodiment according to FIG. 4 differs from the previous statements in that the shaft or Axis 6 or 20 from the machine frame 10 directly through a electrical insulator layer 40 under the steel jacket 7 of the Roller 5 is arranged. It also extends electrical insulator on the two end faces 41 as frontal insulator layer 42, which is in radial Direction at least up to the axis, shaft 6 or 20 concentric layer 40 extends. she can but also extend to the outer edge.
  • a high voltage source 43 is provided, the Exit with a total of 44 Corona charging electrode is connected via a short axial area, substantially parallel to the Shaft or axis 6, 20 extends in the axial direction and the limited conductive coating 8 is opposite.
  • the grounded roller core 45 one is created Charge that on the entire surface is evenly distributed so that the limited conductive Covering 8 can serve to charge the material web.
  • the roller can also be used as Imprinter in a gravure printing plant to be trained with it 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)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Current-Collector Devices For Electrically Propelled Vehicles (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

Die Erfindung betrifft 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 Device for electrostatically charging the two Outside of at least one material web with charges opposite polarity, before processing the at least one web of material, this through the gap of a pair parallel to each other and with a small distance mutually arranged rollers is guided.

Eine solche Vorrichtung zum elektrostatischen Aufladen ist bekannt (DE-31 17 419 A1). 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 device for Electrostatic charging is known (DE-31 17 419 A1). Here, several material webs become one strand merged and only the two outer sides by means of one designed as a corona charging electrode Electrostatic charging device after the first Pair of rollers using a high voltage source of 30 kV charged.

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.The disadvantage of this known device is that spatially not very targeted charging of the two Outside of the material webs. So vagabonded Most of the charged particles in the entire area where the charging takes place. This results in a poor charging efficiency. Moreover there is a risk that with unfavorable Ambient conditions the corona charging electrodes pollute and consequently fail to serve. The Cleaning effort can be very considerable.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung vorzuschlagen, mittels der ein gezielteres Aufladen mit besserem Wirkungsgrad möglich ist.The invention is based on the object a Propose device by means of which a more targeted Charging with better efficiency is possible.

Diese Aufgabe wird bei der Vorrichtung durch die Merkmale des Anspruches 1 gelöst.This task is done with the device solved by the features of claim 1.

Hierbei kann die Aufladung der Walze über die Oberfläche und zwar mittels einer sogenannten Kontaktwalze (DE-38 23 739 A1), über ansich bekannte Streichbürsten, einen Schleifkontakt oder eine Koronaaufladungselektrode erfolgen.The roller can be charged via the surface by means of a so-called contact roller (DE-38 23 739 A1), via brushes known per se, one Slip contact or a corona charging electrode respectively.

In zweckmäßiger Weiterbildung wird bei der 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. In practical training at However, the device according to the invention the charging by device formed from the pair of rollers from the inside performed, each roller over a steel jacket a limited electrically conductive (so-called semiconducting) covering and - for electrical Charging the limited conductive surface - the Steel jacket of each roller to a positive or negative High voltage source can be connected. In the device according to the invention is because of the supply of Tension from the inside, especially afterwards Installation in existing systems for processing Material webs, preferably made of plastic or paper possible with a high voltage source of 3 to 7 kV.

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.Thus, also with reference to the state of the art worked considerably lower voltages. Moreover the charging takes place exactly at the point to be charged, namely on the outside of the at least one Material web, which is compared to the state of the Technology results in significantly better efficiency. Finally, because of the elimination of Corona charging electrodes a cleaning effort for this completely unnecessary, so that even in operation lower costs due to plant downtimes surrender.

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.The axis or shaft of the invention is expedient Roller electrically connected to the steel jacket and electrically isolated from the machine frame for the roller. For electrically charging the limited conductive covering becomes the electrical high voltage to the axis or shaft placed, which has a connection for this purpose. This can either be a fixed connection to the axis or as one to be placed on the face of the shaft Thrust bearing be formed.

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 concentric to the axis or shaft of the Roll a primary coil next to this with respect to the Machine frame fixed and concentric to the axis or Shaft of the roller on one end face Secondary coil with this all around is firmly attached that their a connection to the axis or shaft and their another connection via a rectifier circuit to the Steel jacket is connected.

Die Walze weist zum Zweck der Isolation von dem Maschinenrahmen unter dem hochleitfähigen Stahlmantel sowie an ihren beiden Stirnseiten einen elektrischen Isolator auf und zum elektrischen Aufladen des begrenzt leitfähigen Belages wird die Hochspannung der Hochspannungsquelle über eine sich im wesentlichen parallel zu der Walze maximaler Richtung erstreckende Korona-Aufladungselektrode aufgebracht. Eine solche Walze kann auch als Presseur im Tiefdruckverfahren Einsatz finden.The roller has the purpose of Isolation from the machine frame under the highly conductive steel jacket as well as on both of them An electrical insulator on and to the front electrical charging of the limited conductive covering High voltage of the high voltage source over a direction extending essentially parallel to the roller Corona charging electrode applied. Such The roller can also be used as an impression roller in the gravure printing process Find.

Weitere Ausgestaltungen der Erfindung sind in den restlichen Unteransprüchen gekennzeichnet.Further embodiments of the invention are in the remaining subclaims marked.

Vier Ausführungsbeispiele der Erfindung werden nachfolgend unter Bezugnahme auf die Zeichnung näher erläutert. In dieser zeigt:

Figur 1
eine erste Ausführungsform der erfindungsgemäßen Vorrichtung, im schematischen Querschnitt und teilweise abgebrochener Darstellung;
Figur 2
eine zweite Ausführungsform der erfindungsgemäßen Vorrichtung, im schematischen Querschnitt und teilweise abgebrochener vereinfachter Darstellung;
Figur 3
eine dritte Ausführungsform der erfindungsgemäßen Vorrichtung, in teilweise ab- und ausgebrochener vereinfachter Darstellung; und
Figur 4
eine vierte Ausführungsform der erfindungsgemäßen Vorrichtung, in teilweise ab- und ausgebrochener, vereinfachter Darstellung.
Four exemplary embodiments of the invention are explained in more detail below with reference to the drawing. In this shows:
Figure 1
a first embodiment of the device according to the invention, in schematic cross section and partially broken representation;
Figure 2
a second embodiment of the device according to the invention, in schematic cross section and partially broken simplified representation;
Figure 3
a third embodiment of the device according to the invention, in a partially broken and broken-away simplified representation; and
Figure 4
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 fixed axis 6 in the first embodiment according to Fig. 1 and a steel jacket 7, on the total designated 8, limited conductive coating as Surface is arranged, which is electrically chargeable is. Between the axis 6 and the steel jacket 7 is a provided with a total of 9 designated ball bearings. Between the two arranged parallel to each other There is a gap 50 between the rollers.

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 10 in total designated machine stand in a total of 11 designated electrical insulation stored. The Distances 12 and 13 are sufficient to discharge or To prevent voltage flashovers.

Die Stirnseite 14 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 14 of the axis 6 is with a total 15 designated generator and a measuring device 16 with connected to a terminal 17, which to the terminal 17 leading line is grounded via a resistor 18. The machine stand 10 is, as schematically with 19 designated, also grounded.

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.2 differs of that according to FIG. 1, as only one of the two rollers shown and the axis 6 there now as shaft 20 is formed rigidly via an electrically conductive Intermediate piece 21 is connected to the steel jacket 7.

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. For this, the shaft 20 from the machine stand 10 is either via an electrically insulating ball bearing 22 or separate insulation 11 connected. It is also possible, to use a normal, electrically conductive ball bearing and between this and the machine stand 10 one to provide electrically insulating sleeve 11.

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.Furthermore, there is a total on the end face 14 of the shaft 20 provided with 23 designated thrust bearing as a connection, which is electrically conductive and on the outside the connection 17 of the high voltage generator 15 via the Measuring device 16 is attached.

Bei beiden Ausführungsformen gemäß Fig. 1 und 2 ist sichergestellt, daß die über die Achse 6 oder Welle 20 angelegte Hochspannung einerseits nicht in den 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.In both embodiments according to FIGS. 1 and 2 ensures that the axis 6 or shaft 20 applied high voltage on the one hand not in the Machine room 10 because of the electrical insulation 11 can reach, on the other hand, the high voltage on the limited conductive coating 8 of the roller 5 from the inside can reach.

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 has also two rollers to form a gap, from but only one for the sake of a better overview Roll up like those in Figs. 1 and 2 are described. It is also concentric to Wave 6 of the roller 5 next to this on one end face 112 a first designated 113 overall Recording device as a magnetizable core with a Secondary coil 114 and a second secondary coil 115 each arranged concentrically 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 118 mit elektrischen Anschlüssen 3 und 4 angeordnet. Die Aufnahmevorrichtung 116 ist. mittels eines Zapfens 119, 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.Another is concentric to the shaft 6 Recording device 116 as a magnetizable core for Inclusion of a concentric to the shaft 6 Primary coil 117 with electrical connections 1 and 2 as well a second arranged between this and the shaft 6 Primary coil 118 with electrical connections 3 and 4 arranged. The cradle 116 is. by means of a Pin 119, which in a with respect to the machine frame fixed anchoring 120 engages with respect to shaft 6 rotatable and has an overall on the inside 121 designated ball bearing, so that this is can rotate, but the magnetizable core due to the Pin 119 and the anchor 120 with respect to the first Recording device 113 can be held non-rotatably.

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.On the secondary side of the first receiving device 113 is also a rectifier circuit 122 and a Smoothing circuit 123 provided with its 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 to one AC voltage generator can be connected. The two electrical connections 3 and 4 of the second primary coil 118 are connected to the inputs of a control circuit connectable, which is the size of the output voltage and / or their frequency - in a manner known per se can change.

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 applies to the second secondary coil 115. Both Secondary coils 114, 115 are connected in parallel. Both Coil is first the rectifier circuit 122 for Rectifying the AC downstream. Behind the Rectifier circuit 122 is smoothing circuit 123, e.g. in the form of an LC filter, as is known per se, arranged. The output of the smoothing circuit 123 is with the limited conductive coating 8 of the roller 5 connected.

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 against the Primary coil 117 moves. Over the air gap between the two magnetizable cores of the holding device 113 and 116 can therefore the AC voltage of the primary coil 117 induce a secondary voltage in the secondary coil 114, which are rectified via the rectifier circuit 122 and the smoothing circuit 123 directly smoothes that limited conductive coating 8 is supplied. The induced voltage of the secondary coil 114 is determined by the second - secondary coil 115 removed and on the second Primary coil 118 in the opposite sense induced with their electrical connections 3 and 4 to one Control circuit is connectable, which the Can control AC voltage source such that at the limited conductive coating 8 of the roller 5 always the same DC voltage is present.

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 statements in that the shaft or Axis 6 or 20 from the machine frame 10 directly through a electrical insulator layer 40 under the steel jacket 7 of the Roller 5 is arranged. It also extends electrical insulator on the two end faces 41 as frontal insulator layer 42, which is in radial Direction at least up to the axis, shaft 6 or 20 concentric layer 40 extends. she can but 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 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 Exit with a total of 44 Corona charging electrode is connected via a short axial area, substantially parallel to the Shaft or axis 6, 20 extends in the axial direction and the limited conductive coating 8 is opposite. Compared to the grounded roller core 45, one is created Charge that on the entire surface is evenly distributed so that the limited conductive Covering 8 can serve to charge the material web. In Expedient design, the roller can also be used as Imprinter in a gravure printing plant to be trained with it to form the electrostatic pressure support.

Claims (8)

  1. A device for electrostatically charging the two outsides of at least one material with a charge of opposite polarity prior to further processing of the at least one material, wherein the material is guided through the gap of a pair of rollers (5) which are arranged in mutually parallel relationship at a small spacing relative to each other, characterised in that the electrostatic charging device is formed by the pair of rollers (5), that over an outer steel casing (7) each roller has a limitedly electrically conductive cover (8), a so-called semiconducting cover, that for electrical charging of the limitedly conductive cover in the gap (50) the steel casing (7) of each roller (5) can be connected to a positive and a negative high-voltage source respectively and that for the purposes of insulation from the machine frame (10) the roller (5) has an electrical insulator (40 and 42 respectively) under the highly conductive steel casing (7) and at its two ends, and that for electrical charging of the limitedly conductive cover (8) the high-voltage source is applied by way of a corona charging electrode (44) which extends substantially parallel to the roller in the axial direction.
  2. A device according to claim 1 characterised in that the roller (5) which is provided with a spindle (6) or shaft (20) is arranged in a machine frame (10) and that the spindle (6) or the shaft (20) of the roller (5) is electrically conductively connected to the steel casing (7) and is electrically insulated from the machine frame (10).
  3. A device according to claim 2 characterised in that the electrical high voltage can be applied by way of a connection which is in the form of a thrust bearing (23) arranged at the end (14) of the shaft (20).
  4. A device according to claim 1 characterised in that arranged fixedly with respect to the machine frame (10, 120) in concentric relationship with the axis or shaft (6) of the roller (5) beside same is a primary coil (117), that in concentric relationship with the axis or shaft (6) of the roller (5) fixedly mounted to the one end (112) thereof to rotate therewith is a secondary coil (114), and that its one connection is connected to the spindle or shaft (6) and its connection is connected to the limitedly conductive cover (8) by way of a rectifier circuit (122).
  5. A device according to claim 4 characterised in that arranged between the rectifier circuit (122) and the limitedly conductive cover (8) is a smoothing circuit (123) for the pulsating direct current.
  6. A device according to claim 4 or claim 5 characterised in that associated with the primary coil (117) is a second primary coil (118) and associated with the secondary coil (114) is a second secondary coil (115) which rotates therewith and which is connected parallel thereto and which is disposed opposite the second primary coil (118).
  7. A device according to one of claims 1 to 6 characterised in that the size of the gap (50) between the rollers (5) is adjustable.
  8. A device according to claim 1 characterised in that the roller (5) is in the form of an impression cylinder for an intaglio printing installation.
EP98917100A 1997-04-02 1998-03-31 Device for electrostatic charging Revoked EP0971851B1 (en)

Applications Claiming Priority (3)

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

Publications (2)

Publication Number Publication Date
EP0971851A1 EP0971851A1 (en) 2000-01-19
EP0971851B1 true 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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EP97950196A Expired - Lifetime EP0923500B1 (en) 1997-04-02 1997-11-16 Method and device for electrostatic charging

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US (2) US6159555A (en)
EP (2) EP0923500B1 (en)
JP (2) JP3258034B2 (en)
AT (2) ATE222210T1 (en)
AU (2) AU736011B2 (en)
DE (4) DE29723999U1 (en)
DK (1) DK0971851T3 (en)
ES (2) ES2181044T3 (en)
WO (2) WO1998043904A1 (en)

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Also Published As

Publication number Publication date
JP2000509697A (en) 2000-08-02
JP3284503B2 (en) 2002-05-20
DE19713662A1 (en) 1998-10-08
EP0923500B1 (en) 2002-08-14
DK0971851T3 (en) 2002-04-08
JP2000505032A (en) 2000-04-25
AU7042598A (en) 1998-10-22
DE59707978D1 (en) 2002-09-19
US6445562B1 (en) 2002-09-03
ATE210593T1 (en) 2001-12-15
WO1998043905A1 (en) 1998-10-08
AU736011B2 (en) 2001-07-26
US6159555A (en) 2000-12-12
AU5322498A (en) 1998-10-22
DE29723999U1 (en) 1999-12-09
EP0923500A1 (en) 1999-06-23
WO1998043904A1 (en) 1998-10-08
EP0971851A1 (en) 2000-01-19
ES2181044T3 (en) 2003-02-16
JP3258034B2 (en) 2002-02-18
ATE222210T1 (en) 2002-08-15
DE59802440D1 (en) 2002-01-24
ES2169509T3 (en) 2002-07-01

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