EP0761458B1 - Method and means for transferring a substrate with electrostatic support - Google Patents

Method and means for transferring a substrate with electrostatic support Download PDF

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Publication number
EP0761458B1
EP0761458B1 EP96810532A EP96810532A EP0761458B1 EP 0761458 B1 EP0761458 B1 EP 0761458B1 EP 96810532 A EP96810532 A EP 96810532A EP 96810532 A EP96810532 A EP 96810532A EP 0761458 B1 EP0761458 B1 EP 0761458B1
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EP
European Patent Office
Prior art keywords
cylinder
substance
printing forme
transfer roller
charging
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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.)
Expired - Lifetime
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EP96810532A
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German (de)
French (fr)
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EP0761458A1 (en
Inventor
Walter Spengler
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Spengler Electronic AG
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Spengler Electronic AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/42—Printing without contact between forme and surface to be printed, e.g. by using electrostatic fields
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F5/00—Rotary letterpress machines
    • B41F5/24—Rotary letterpress machines for flexographic printing

Definitions

  • the present invention relates to a method for electrostatic substrate transfer, as in the preamble of independent claim 1 is defined, and an apparatus for performing this method.
  • Methods of application are particularly common in printing technology a substrate on a medium known in which Substrate from a substrate transfer roller to one Printing form cylinder and transferred from there to the medium is that of an impression cylinder against the printing form cylinder is pressed.
  • the substrate transfer roller, the printing form cylinder and the impression cylinder can vary in various ways and depend among other things of the substrate, the medium and the desired application quality from.
  • GB-A-608 902 discloses a printing device for the substrate from a printing form cylinder to a medium is transmitted, the transmission by means of an electrode is supported electrostatically. Instead of an impression cylinder stationary counter-bodies made of glass are provided.
  • US-A-3 443 517 discloses a method of transmission of dye particles from a dye transfer roller onto a printing form cylinder and from there onto a medium known, in which the printing form cylinder from the inside all around is charged.
  • the dye particles on the dye transfer roller be with an opposite Load provided so that its transfer to the printing form cylinder is supported electrostatically.
  • a disadvantage this method or the device for performing However, this procedure is that of charging of the entire printing form cylinder for its storage Insulation must be provided.
  • the invention has for its object a method and a device for electrostatic substrate transfer to create a quality substrate transfer from the substrate transfer roller to the medium guarantee.
  • the substrate should also as many other powdery or liquid substances as possible and as a medium, in addition to paper and cardboard, if possible many other materials can be used.
  • a cylindrical substrate transfer roller 1 is arranged that its lower part in a substrate container 9 protrudes and dips into substrate 4 '.
  • the substrate 4 ' can be made from printing ink, varnish, primer paint or varnish, cold seal, Glue, wax etc. exist.
  • the substrate transfer roller 1 is grounded and has a core 100 and one Coat 101, the surface of which is gridded, metted or can be smooth. When the substrate transfer roller rotates 1 in the direction of arrow A, is on the from the Substrate 4 'emerging surface surface substrate 4 taken.
  • a printing form cylinder 2 Adjacent to and parallel to the substrate transfer roller 1, a printing form cylinder 2 is arranged, the with the rotation of the substrate transfer roller 1 in the direction of arrow A rotates in the direction of arrow B.
  • the Printing form cylinder 2 has a grounded core 200, one insulating inner jacket 201 and a semiconducting outer jacket 202 on.
  • the insulating inner jacket 201 preferably has a specific resistance greater than 1 G ⁇ cm
  • the semiconducting outer jacket 202 has a specific Resistance between 0.5 M ⁇ cm and 50 M ⁇ cm, preferably between 0.5 M ⁇ cm and 10 M ⁇ cm.
  • the Outer jacket 202 can, depending on the substrate 4 to be transferred made of different materials, e.g. made of rubber, plastic or metal. When using the device as a printing device, it contains the desired one Full or halftone image, e.g. engraved in the rubber or as a mounted photopolymer cliché.
  • the substrate transfer from the substrate transfer roller 1 on the printing form cylinder 2 takes place in the so-called substrate transfer area, which includes the area where the Printing form cylinder 2 rests on the substrate transfer roller 1.
  • the printing form cylinder 2 becomes close to the substrate transfer area locally negative by means of a spray electrode 6 charged so that in the substrate transfer area electric field is established.
  • the spray electrode 6 is sword-shaped, that means she has an elongated Edge on which is the charge of the printing form cylinder 2 in the desired area over the entire length. It is arranged so that the charging of the printing form cylinder 2 takes place from the outside without the adjacent substrate transfer roller 1 also charged becomes.
  • the one required for optimal substrate transfer Spray electrode voltage depends on how far away from the substrate transfer area of the printing form cylinders 2 is charged locally.
  • the spray electrode becomes very close positioned at the substrate transfer area are about 2000 V, however, it will not be near the substrate transfer region positioned, about 8000 V are required.
  • the voltage is usually between about 2500 V and about 2800 V.
  • the optimal positioning of the spray electrode 6 and the optimal setting of the spray electrode voltage can easily be done by a specialist. in the Comparison to the previously known printing processes in which electrostatic printing aids are used because of the targeted local charging for the charging device much smaller supply voltages are required.
  • a grounded impression cylinder 3 is parallel to the Printing form cylinder 2 arranged so that it is a medium 7 against presses the printing form cylinder 2.
  • the impression cylinder rotates 3 in the direction of arrow C and the medium 7 moves up in the direction of arrow D.
  • the local loaded part of the printing form cylinder 2 and that on it Surface adhering substrate 4 becomes during this rotation also filmed.
  • this creates a second electric field the penetrates the medium 7. This will ensure good substrate transfer guaranteed by the printing form cylinder 2 on the medium 7.
  • the substrate transfer from the printing form cylinder 2 insufficient on the medium 7, which e.g. at a highly insulating medium 7 may be the case instead of the mentioned grounded impression cylinder 3
  • Back pressure cylinder 33 are used, which by means of a second spray electrode 62 is positively charged locally, so that in the area where the impression cylinder 33 is the medium 7 presses against the printing form cylinder 2, the electrical Field is strengthened.
  • the impression cylinder 33 has a grounded core 330, an insulating inner jacket 331 and a semiconducting one Outer jacket 332.
  • the insulating inner jacket 331 has preferably a specific resistance greater than 1 G ⁇ cm, while the semiconducting outer jacket 332 has a specific Resistance between 0.5 M ⁇ cm and 50 M ⁇ cm, preferably between 0.5 M ⁇ cm and 10 M ⁇ cm.
  • the spray electrode 62 is constructed in the same way as the spray electrode 6 and for positioning and spray electrode voltage this applies in connection with the spray electrode 6 said.
  • the printing form cylinder becomes a variant 22 by means of a plurality of conductive tips 8 from the inside and not locally by means of a spray electrode negatively charged.
  • the printing form cylinder 22 has an insulating core 220 and a semiconductive jacket 221.
  • the isolating one Core 220 preferably has a resistivity greater than 1 G ⁇ cm, while the semiconducting jacket 221 preferably a specific resistance between 20 M ⁇ cm and 50 M ⁇ cm.
  • the Case is the substrate transfer insufficient from the form cylinder 22 to the medium 7, what e.g. with a highly insulating medium 7 the Case can be instead of the grounded impression cylinder 3 an impression cylinder 31 can be used, the by means of a plurality of conductive tips 81 from the inside is positively charged locally, so in the area where the impression cylinder 31 the medium 7 against the printing form cylinder 22 presses, the electric field is amplified.
  • the impression cylinder 31 has an insulating core 310 and a semiconducting jacket 311.
  • the isolating one Core 310 preferably has a resistivity greater than 1 G ⁇ cm, while the semiconducting jacket 311 preferably a specific resistance between 20 M ⁇ cm and 50 M ⁇ cm.
  • the printing form cylinder 21 in the vicinity of the substrate transfer region locally by means of a spray electrode 61 negatively charged so that in the substrate transfer area an electric field is established.
  • the spray electrode 61 In this variant, however, it must be below the Substrate transfer area to be positioned so that by the rotation of the printing form cylinder 21 the loaded Area of the printing form cylinder 21 not to the substrate transfer area turned, but turned away from it becomes what a higher spray electrode voltage is necessary makes. To the arrangement of the spray electrode 61 between the To enable medium 7 and the substrate transfer region, this is formed kinked.
  • the printing form cylinder 21 has an insulating core 210 and a semiconductive jacket 211.
  • the isolating one Core 210 preferably has a resistivity greater than 1 G ⁇ cm, while the semiconducting jacket 211 a specific resistance between 0.5 M ⁇ cm and 50 M ⁇ cm, preferably between 0.5 M ⁇ cm and 10 M ⁇ cm.
  • An impression cylinder 32 which has an insulating core 320 and comprises a grounded jacket 321 is parallel-axis to the plate cylinder 21 arranged so that it is a medium 7 presses against the printing form cylinder 21.
  • the Printing form cylinder 21 rotates in the direction of arrow B ' Impression cylinder 32 in the direction of arrow C 'and the medium 7 moves in the direction of arrow D '.
  • the locally loaded one Part of the printing form cylinder 21 and that on it Surface adhering substrate 4 becomes during this rotation also filmed.
  • a second electric field is built up, that penetrates the medium 7. This will be a good one Substrate transfer from the printing form cylinder 21 to the medium 7 guaranteed.
  • the substrate transfer from the printing form cylinder 21 insufficient on the medium 7, which e.g. at a highly insulating medium 7 may be the case instead of the mentioned impression cylinder 32 is an impression cylinder 34 can be used by means of a second Spray electrode 62 is positively charged locally, so that in the area where the impression cylinder 34 holds the medium 7 presses against the printing form cylinder 21, the electric field is reinforced.
  • the impression cylinder 34 has an insulating core 340 and a semiconductive jacket 341.
  • the isolating one Core 340 preferably has a resistivity greater than 1 G ⁇ cm, while the semiconducting jacket 341 a specific resistance between 0.5 M ⁇ cm and 50 M ⁇ cm, preferably between 0.5 M ⁇ cm and 10 M ⁇ cm.
  • the spray electrode 62 is constructed in the same way as the spray electrode 6 and for positioning and spray electrode voltage this applies in connection with the spray electrode 6 said.
  • the printing form cylinder becomes a variant 22 by means of a plurality of conductive tips 8 from the inside and not locally by means of a spray electrode negatively charged.
  • the printing form cylinder 22 has an insulating core 220 and a semiconductive jacket 221.
  • the isolating one Core 220 preferably has a resistivity greater than 1 G ⁇ cm, while the semiconducting jacket 221 preferably a specific resistance between 20 M ⁇ cm and 50 M ⁇ cm.
  • Impression cylinder 32 is an earthed impression cylinder 3 be used.
  • the substrate transfer insufficient from the form cylinder 22 to the medium 7, what e.g. with a highly insulating medium 7 the Case can be instead of the grounded impression cylinder 3 an impression cylinder 31 can be used, the by means of a plurality of conductive tips 81 from the inside is positively charged locally, so in the area where the impression cylinder 31 the medium 7 against the printing form cylinder 22 presses, the electric field is amplified.
  • the impression cylinder 31 has an insulating core 310 and a semiconducting jacket 311.
  • the isolating one Core 310 preferably has a resistivity greater than 1 G ⁇ cm, while the semiconducting jacket 311 preferably a specific resistance between 20 M ⁇ cm and 50 M ⁇ cm.
  • the front part of the spray electrodes 6, 61, 62 used has an elongated as a charge-transferring part Sword 600 with an edge 601.
  • the sword is 600 by means of a brass sleeve 602 on a carrier element 603 attached and mounted in a housing 604, which according to open at the front and bevelled. This will the charge spray is limited to a certain angular range.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ink Jet (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Printing Methods (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)
  • Rotary Presses (AREA)
  • Ink Jet Recording Methods And Recording Media Thereof (AREA)

Abstract

The method involves transferring the substrate (4) from a substrate transfer roller (1) to a pressure shaping cylinder (2) and from there to a medium (7) which is pressed against the pressure shaping cylinder by a counter pressure cylinder (3). The pressure shaping cylinder is locally charged near the region in which the substrate is transferred from the transfer roller to the pressure shaping cylinder. The counter pressure cylinder is oppositely charged near the region which presses the medium against the pressure shaping cylinder.

Description

Die vorliegende Erfindung bezieht sich auf ein Verfahren zur elektrostatischen Substratübertragung, wie es im Oberbegriff des unabhängigen Patentanspruchs 1 definiert ist, und auf eine Vorrichtung zur Durchführung dieses Verfahrens.The present invention relates to a method for electrostatic substrate transfer, as in the preamble of independent claim 1 is defined, and an apparatus for performing this method.

Insbesondere aus der Drucktechnik sind Verfahren zur Auftragung eines Substrates auf ein Medium bekannt, bei denen Substrat von einer Substratübertragungswalze auf einen Druckformzylinder und von dort aus auf das Medium übertragen wird, das von einem Gegendruckzylinder gegen den Druckformzylinder gedrückt wird. Die Substratübertragungswalze, der Druckformzylinder und der Gegendruckzylinder können dabei auf vielfältige Weise variieren und hängen unter anderem vom Substrat, vom Medium und von der gewünschten Auftragungsqualität ab.Methods of application are particularly common in printing technology a substrate on a medium known in which Substrate from a substrate transfer roller to one Printing form cylinder and transferred from there to the medium is that of an impression cylinder against the printing form cylinder is pressed. The substrate transfer roller, the printing form cylinder and the impression cylinder can vary in various ways and depend among other things of the substrate, the medium and the desired application quality from.

Zur Verbesserung der Druckqualität, das heisst der Farbauftragung auf das Medium, werden beim Tiefdruck elektrostatische Druckhilfen eingesetzt, die verschiedenartig ausgebildet sein können. In der DE-PS 1 571 839 ist beispielsweise ein Tiefdruckverfahren mit einer dazugehörigen Vorrichtung beschrieben, bei dem durch Anlegen einer elektrischen Ladung an den Gegendruckzylinder ein elektrisches Feld erzeugt wird, das das Medium am Einzugsspalt zwischen dem Näpfchen aufweisenden Druckformzylinder und dem Gegendruckzylinder durchsetzt und mittels dessen der Druckfarbe in den Näpfchen am Einzugsspalt eine induzierte Ladung solcher Grösse aufgedrückt wird, dass die Oberflächenspannungskräfte überwunden werden, die die Druckfarbe in den Näpfchen halten.To improve the print quality, that is, the color application on the medium, become electrostatic during gravure printing Printing aids used, which are designed differently could be. In DE-PS 1 571 839, for example a gravure printing process with an associated device described in which by applying an electrical charge generates an electric field on the impression cylinder that the medium at the feed gap between the Printing plate cylinder and the impression cylinder enforced and by means of which the printing ink in the wells at the feed gap an induced charge of such Size is imprinted that the surface tension forces be overcome, the ink in the well hold.

Zumindest aus der US-A-2 408 144 ist zudem bekannt, dass elektrostatische Druckhilfen auch beim Hochdruck oder beim Flachdruck verwendet werden können.At least from US-A-2 408 144 it is also known that electrostatic pressure aids also at high pressure or at Flat printing can be used.

In der GB-A-608 902 ist eine Druckvorrichtung offenbart, bei der Substrat von einem Druckformzylinder auf ein Medium übertragen wird, wobei die Übertragung mittels einer Elektrode elektrostatisch unterstützt wird. Anstelle eines Gegendruckzylinders sind ortsfeste Gegenkörper aus Glas vorgesehen.GB-A-608 902 discloses a printing device for the substrate from a printing form cylinder to a medium is transmitted, the transmission by means of an electrode is supported electrostatically. Instead of an impression cylinder stationary counter-bodies made of glass are provided.

Alle oben erwähnten elektrostatischen Druckhilfen dienen dazu, zwischen dem Druckformzylinder und dem Gegendruckzylinder bzw. den ortsfesten Gegenkörpern ein elektrisches Feld zu erzeugen, das das Medium an dieser Stelle durchsetzt, so dass die Druckfarbe besser vom Druckformzylinder auf das Medium übertragen wird. Die bisher bekannten Druckverfahren, in denen solche elektrostatischen Druckhilfen benützt werden, weisen den Nachteil auf, dass eventuell dadurch keine ausreichende Druckqualität erreicht wird, dass der Druckformzylinder ungenügend mit Druckfarbe versorgt wird.All electrostatic printing aids mentioned above serve in addition, between the printing form cylinder and the impression cylinder or the stationary counterparts an electrical To create a field that penetrates the medium at this point, so the printing ink better from the printing form cylinder is transferred to the medium. The previously known printing processes, in which such electrostatic printing aids are used, have the disadvantage that possibly insufficient print quality is achieved that the printing form cylinder is insufficiently supplied with printing ink becomes.

Aus der US-A-3 443 517 ist ein Verfahren zur Übertragung von Farbstoffpartikeln von einer Farbstoffübertragungswalze auf einen Druckformzylinder und von dort aus auf ein Medium bekannt, bei dem der Druckformzylinder von innen her rundherum aufgeladen wird. Die Farbstoffpartikel auf der Farbstoffübertragungswalze werden mit einer entgegengesetzten Ladung versehen, so dass ihre Übertragung auf den Druckformzylinder elektrostatisch unterstützt wird. Ein Nachteil dieses Verfahrens bzw. der Vorrichtung zur Durchführung dieses Verfahrens besteht aber darin, dass durch das Aufladen des ganzen Druckformzylinders für dessen Lagerung eine Isolierung vorgesehen sein muss.US-A-3 443 517 discloses a method of transmission of dye particles from a dye transfer roller onto a printing form cylinder and from there onto a medium known, in which the printing form cylinder from the inside all around is charged. The dye particles on the dye transfer roller be with an opposite Load provided so that its transfer to the printing form cylinder is supported electrostatically. A disadvantage this method or the device for performing However, this procedure is that of charging of the entire printing form cylinder for its storage Insulation must be provided.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zur elektrostatischen Substratübertragung zu schaffen, die eine qualitativ einwandfreie Substratübertragung von der Substratübertragungswalze bis zum Medium gewährleisten. Als Substrat sollen neben Druckfarbe auch möglichst viele andere puderförmige oder flüssige Substanzen und als Medium neben Papier und Karton auch möglichst viele andere Materialien verwendet werden können.The invention has for its object a method and a device for electrostatic substrate transfer to create a quality substrate transfer from the substrate transfer roller to the medium guarantee. In addition to printing ink, the substrate should also as many other powdery or liquid substances as possible and as a medium, in addition to paper and cardboard, if possible many other materials can be used.

Diese Aufgabe wird durch das erfindungsgemässe Verfahren und die erfindungsgemässe Vorrichtung zur elektrostatischen Substratübertragung gelöst, wie sie in den unabhängigen Patentansprüchen 1 und 6 definiert sind. Bevorzugte Ausführungsvarianten ergeben sich aus den abhängigen Patentansprüchen. Das Wesen der Erfindung besteht darin, dass ein Druckformzylinder in der Nähe des Bereichs, in dem er von einer Substratübertragungswalze mit Substrat versorgt wird, durch eine Ladeeinrichtung lokal aufgeladen wird, so dass die Substratübertragung von der Substratübertragungswalze auf den Druckformzylinder durch ein elektrisches Feld im Übertragungsbereich verbessert wird. This object is achieved by the method according to the invention and the device according to the invention for electrostatic Substrate transfer solved, as in the independent claims 1 and 6 are defined. Preferred versions result from the dependent patent claims. The essence of the invention is that a Printing form cylinder near the area where it is from a substrate transfer roller is supplied with substrate, is charged locally by a charging device, so that the substrate transfer from the substrate transfer roller on the printing form cylinder by an electric field in the Transmission range is improved.

Dank der Erfindung ist es nun möglich, verschiedenartigste Substrate auf verschiedenartigste Medien in einwandfreier Qualität aufzutragen.Thanks to the invention, it is now possible to use a wide variety Substrates on various media in perfect condition To apply quality.

Im folgenden werden Ausführungsvarianten des erfindungsgemässen Verfahrens und der erfindungsgemässen Vorrichtung zur elektrostatischen Substratübertragung unter Bezugnahme auf die beigefügten Zeichnungen detaillierter beschrieben. Dabei zeigen:

Figur 1 -
eine Substratübertragungsvorrichtung mit vertikal geführtem Medium und einer Sprühelektrode zur lokalen Aufladung des Druckformzylinders in schematischer Schnittdarstellung;
Figur 2 -
eine Substratübertragungsvorrichtung gemäss Figur 1 mit zusätzlich einer Sprühelektrode zur lokalen Aufladung des Gegendruckzylinders in schematischer Schnittdarstellung;
Figur 3 -
eine Substratübertragungsvorrichtung mit vertikal geführtem Medium und mit im Innern des Druckformzylinders angeordneten leitenden Spitzen zu dessen lokalen Aufladung in schematischer Schnittdarstellung;
Figur 4 -
eine Substratübertragungsvorrichtung gemäss Figur 3 mit zusätzlich im Innern des Gegendruckzylinders angeordneten leitenden Spitzen zu dessen lokalen Aufladung in schematischer Schnittdarstellung;
Figur 5 -
eine Substratübertragungsvorrichtung mit horizontal geführtem Medium und einer Sprühelektrode zur lokalen Aufladung des Druckformzylinders in schematischer Schnittdarstellung;
Figur 6 -
eine Substratübertragungsvorrichtung gemäss Figur 5 mit zusätzlich einer Sprühelektrode zur lokalen Aufladung des Gegendruckzylinders in schematischer Schnittdarstellung;
Figur 7 -
eine Substratübertragungsvorrichtung mit horizontal geführtem Medium und mit im Innern des Druckformzylinders angeordneten leitenden Spitzen zu dessen lokalen Aufladung in schematischer Schnittdarstellung;
Figur 8 -
eine Substratübertragungsvorrichtung gemäss Figur 7 mit zusätzlich im Innern des Gegendruckzylinders angeordneten leitenden Spitzen zu dessen lokalen Aufladung in schematischer Schnittdarstellung und
Figur 9 -
den Vorderteil einer Sprühelektrode im Längsschnitt.
Embodiment variants of the method according to the invention and the device according to the invention for electrostatic substrate transfer are described in more detail with reference to the accompanying drawings. Show:
Figure 1 -
a substrate transfer device with a vertically guided medium and a spray electrode for local charging of the printing form cylinder in a schematic sectional view;
Figure 2 -
a substrate transfer device according to Figure 1 with an additional spray electrode for local charging of the impression cylinder in a schematic sectional view;
Figure 3 -
a substrate transfer device with vertically guided medium and with arranged inside the printing form cylinder conductive tips for its local charging in a schematic sectional view;
Figure 4 -
a substrate transfer device according to Figure 3 with additional arranged inside the impression cylinder conductive tips for its local charging in a schematic sectional view;
Figure 5 -
a substrate transfer device with horizontally guided medium and a spray electrode for local charging of the printing form cylinder in a schematic sectional view;
Figure 6 -
a substrate transfer device according to Figure 5 with an additional spray electrode for local charging of the impression cylinder in a schematic sectional view;
Figure 7 -
a substrate transfer device with horizontally guided medium and with conductive tips arranged inside the printing form cylinder for its local charging in a schematic sectional view;
Figure 8 -
7 shows a substrate transfer device according to FIG. 7 with additional conductive tips arranged in the interior of the impression cylinder for its local charging in a schematic sectional illustration and
Figure 9 -
the front part of a spray electrode in longitudinal section.

Figur 1Figure 1

Eine zylinderförmige Substratübertragungswalze 1 ist so angeordnet, dass ihr unterer Teil in einen Substratbehälter 9 hineinragt und in Substrat 4' eintaucht. Das Substrat 4' kann aus Druckfarbe, Lack, Grundierfarbe oder -lack, Kaltsiegel, Leim, Wachs etc. bestehen. Die Substratübertragungswalze 1 ist geerdet und weist einen Kern 100 und einen Mantel 101 auf, dessen Oberfläche gerastert, molettiert oder glatt sein kann. Bei der Rotation der Substratübertragungswalze 1 in Richtung des Pfeils A, wird auf der aus dem Substrat 4' auftauchenden Manteloberfläche Substrat 4 mitgenommen. Zur Steuerung der erforderlichen Substratmenge wird bei gerasterten oder molettierten Substratübertragungswalzen 1 eine Rakel 5 eingesetzt, die das überflüssige Substrat 4 abstreicht. Bei Vorrichtungen ohne gerasterter oder molettierter Substratübertragungswalze wird die Substratmenge über einen differenzierten Anpressdruck der Substratübertragungswalze gegen den Druckformzylinder gesteuert.A cylindrical substrate transfer roller 1 is arranged that its lower part in a substrate container 9 protrudes and dips into substrate 4 '. The substrate 4 ' can be made from printing ink, varnish, primer paint or varnish, cold seal, Glue, wax etc. exist. The substrate transfer roller 1 is grounded and has a core 100 and one Coat 101, the surface of which is gridded, metted or can be smooth. When the substrate transfer roller rotates 1 in the direction of arrow A, is on the from the Substrate 4 'emerging surface surface substrate 4 taken. To control the amount of substrate required is used with screened or metted substrate transfer rollers 1 a squeegee 5 used, the superfluous Wipes off substrate 4. For devices without a grid or molten substrate transfer roller becomes the amount of substrate via a differentiated contact pressure of the substrate transfer roller controlled against the printing form cylinder.

Anliegend an und parallelachsig zu der Substratübertragungswalze 1 ist ein Druckformzylinder 2 angeordnet, der bei der Rotation der Substratübertragungswalze 1 in Richtung des Pfeils A in Richtung des Pfeils B rotiert. Der Druckformzylinder 2 weist einen geerdeten Kern 200, einen isolierenden Innenmantel 201 und einen halbleitenden Aussenmantel 202 auf. Der isolierende Innenmantel 201 hat vorzugsweise einen spezifischen Widerstand grösser als 1 GΩcm, während der halbleitende Aussenmantel 202 einen spezifischen Widerstand zwischen 0,5 MΩcm und 50 MΩcm, vorzugsweise zwischen 0,5 MΩcm und 10 MΩcm aufweist. Der Aussenmantel 202 kann je nach zu übertragendem Substrat 4 aus unterschiedlichen Materialien, z.B. aus Gummi, Kunststoff oder Metall, bestehen. Bei der Verwendung der Vorrichtung als Druckvorrichtung beinhaltet er das gewünschte Voll- oder Halbtonbild, z.B. in das Gummi eingraviert oder als aufgezogenes Fotopolymerklischee.Adjacent to and parallel to the substrate transfer roller 1, a printing form cylinder 2 is arranged, the with the rotation of the substrate transfer roller 1 in the direction of arrow A rotates in the direction of arrow B. The Printing form cylinder 2 has a grounded core 200, one insulating inner jacket 201 and a semiconducting outer jacket 202 on. The insulating inner jacket 201 preferably has a specific resistance greater than 1 GΩcm, while the semiconducting outer jacket 202 has a specific Resistance between 0.5 MΩcm and 50 MΩcm, preferably between 0.5 MΩcm and 10 MΩcm. The Outer jacket 202 can, depending on the substrate 4 to be transferred made of different materials, e.g. made of rubber, plastic or metal. When using the device as a printing device, it contains the desired one Full or halftone image, e.g. engraved in the rubber or as a mounted photopolymer cliché.

Die Substratübertragung von der Substratübertragungswalze 1 auf den Druckformzylinder 2 erfolgt im sogenannten Substratübertragungsbereich, der den Bereich umfasst, wo der Druckformzylinder 2 an der Substratübertragungswalze 1 anliegt. Um eine bessere Substratübertragung zu erreichen, wird der Druckformzylinder 2 in der Nähe des Substratübertragungsbereichs mittels einer Sprühelektrode 6 lokal negativ aufgeladen, so dass im Substratübertragungsbereich ein elektrisches Feld aufgebaut wird. Die Sprühelektrode 6 ist schwertförmig ausgebildet, das heisst sie weist eine langgezogene Kante auf, die die Aufladung des Druckformzylinders 2 im gewünschten Bereich auf der ganzen Länge vornimmt. Sie ist so angeordnet, dass die Aufladung des Druckformzylinders 2 von aussen erfolgt, ohne dass dadurch die benachbarte Substratübertragungswalze 1 ebenfalls aufgeladen wird. Die für eine optimale Substratübertragung benötigte Sprühelektrodenspannung hängt davon ab, wie weit entfernt vom Substratübertragungsbereich der Druckformzylinder 2 lokal aufgeladen wird. Wird die Sprühelektrode sehr nahe am Substratübertragungsbereich positioniert, sind etwa 2000 V nötig, wird sie dagegen nicht in der Nähe des Substratübertragungsbereichs positioniert, sind etwa 8000 V nötig. Üblicherweise liegt die Spannung zwischen etwa 2500 V und etwa 2800 V. Die optimale Positionierung der Sprühelektrode 6 und die optimale Einstellung der Sprühelektrodenspannung können von einem Fachmann problemlos vorgenommen werden. Im Vergleich zu den bisher bekannten Druckverfahren, in denen elektrostatische Druckhilfen benützt werden, werden somit wegen der gezielt lokalen Aufladung für die Ladeeinrichtung viel kleinere Speisespannungen benötigt.The substrate transfer from the substrate transfer roller 1 on the printing form cylinder 2 takes place in the so-called substrate transfer area, which includes the area where the Printing form cylinder 2 rests on the substrate transfer roller 1. To achieve better substrate transfer, the printing form cylinder 2 becomes close to the substrate transfer area locally negative by means of a spray electrode 6 charged so that in the substrate transfer area electric field is established. The spray electrode 6 is sword-shaped, that means she has an elongated Edge on which is the charge of the printing form cylinder 2 in the desired area over the entire length. It is arranged so that the charging of the printing form cylinder 2 takes place from the outside without the adjacent substrate transfer roller 1 also charged becomes. The one required for optimal substrate transfer Spray electrode voltage depends on how far away from the substrate transfer area of the printing form cylinders 2 is charged locally. The spray electrode becomes very close positioned at the substrate transfer area are about 2000 V, however, it will not be near the substrate transfer region positioned, about 8000 V are required. The voltage is usually between about 2500 V and about 2800 V. The optimal positioning of the spray electrode 6 and the optimal setting of the spray electrode voltage can easily be done by a specialist. in the Comparison to the previously known printing processes in which electrostatic printing aids are used because of the targeted local charging for the charging device much smaller supply voltages are required.

Ein geerdeter Gegendruckzylinder 3 ist parallelachsig zum Druckformzylinder 2 so angeordnet, dass er ein Medium 7 gegen den Druckformzylinder 2 drückt. Bei Rotation des Druckformzylinders 2 in Richtung des Pfeils B rotiert der Gegendruckzylinder 3 in Richtung des Pfeils C und das Medium 7 bewegt sich in Richtung des Pfeils D nach oben. Der lokal geladene Teil des Druckformzylinders 2 und das an seiner Oberfläche haftende Substrat 4 wird bei dieser Rotation ebenfalls mitgedreht. In dem Bereich, wo der Gegendruckzylinder 3 das Medium 7 gegen den Druckformzylinder 2 drückt, wird dadurch ein zweites elektrisches Feld aufgebaut, das das Medium 7 durchsetzt. Damit wird eine gute Substratübertragung vom Druckformzylinder 2 auf das Medium 7 gewährleistet.A grounded impression cylinder 3 is parallel to the Printing form cylinder 2 arranged so that it is a medium 7 against presses the printing form cylinder 2. When the printing form cylinder rotates 2 in the direction of arrow B the impression cylinder rotates 3 in the direction of arrow C and the medium 7 moves up in the direction of arrow D. The local loaded part of the printing form cylinder 2 and that on it Surface adhering substrate 4 becomes during this rotation also filmed. In the area where the impression cylinder 3 presses the medium 7 against the printing form cylinder 2, this creates a second electric field, the penetrates the medium 7. This will ensure good substrate transfer guaranteed by the printing form cylinder 2 on the medium 7.

Für die gesamte weitere Beschreibung gilt folgende Festlegung. Sind in einer Figur zum Zweck zeichnerischer Eindeutigkeit Bezugsziffern enthalten, aber im unmittelbar zugehörigen Beschreibungstext nicht erläutert, so wird auf deren Erwähnung in vorangehenden Figurenbeschreibungen Bezug genommen.The following definition applies to the entire further description. Are in a figure for the sake of graphic clarity Reference numbers included, but in the immediately associated Descriptive text not explained, so is on their Mention in previous figure descriptions reference taken.

Figur 2Figure 2

Ist in der im Zusammenhang mit Figur 1 beschriebenen Ausführungsvariante die Substratübertragung vom Druckformzylinder 2 auf das Medium 7 ungenügend, was z.B. bei einem stark isolierenden Medium 7 der Fall sein kann, kann anstelle des erwähnten geerdeten Gegendruckzylinders 3 ein Gegendruckzylinder 33 verwendet werden, der mittels einer zweiten Sprühelektrode 62 lokal positiv aufgeladen wird, so dass in dem Bereich, wo der Gegendruckzylinder 33 das Medium 7 gegen den Druckformzylinder 2 drückt, das elektrische Feld verstärkt wird.Is in the embodiment variant described in connection with Figure 1 the substrate transfer from the printing form cylinder 2 insufficient on the medium 7, which e.g. at a highly insulating medium 7 may be the case instead of the mentioned grounded impression cylinder 3 Back pressure cylinder 33 are used, which by means of a second spray electrode 62 is positively charged locally, so that in the area where the impression cylinder 33 is the medium 7 presses against the printing form cylinder 2, the electrical Field is strengthened.

Der Gegendruckzylinder 33 weist einen geerdeten Kern 330, einen isolierenden Innenmantel 331 und einen halbleitenden Aussenmantel 332 auf. Der isolierende Innenmantel 331 hat vorzugsweise einen spezifischen Widerstand grösser als 1 GΩcm, während der halbleitende Aussenmantel 332 einen spezifischen Widerstand zwischen 0,5 MΩcm und 50 MΩcm, vorzugsweise zwischen 0,5 MΩcm und 10 MΩcm aufweist.The impression cylinder 33 has a grounded core 330, an insulating inner jacket 331 and a semiconducting one Outer jacket 332. The insulating inner jacket 331 has preferably a specific resistance greater than 1 GΩcm, while the semiconducting outer jacket 332 has a specific Resistance between 0.5 MΩcm and 50 MΩcm, preferably between 0.5 MΩcm and 10 MΩcm.

Die Sprühelektrode 62 ist gleich aufgebaut wie die Sprühelektrode 6 und für die Positionierung und die Sprühelektrodenspannung gilt das im Zusammenhang mit der Sprühelektrode 6 Gesagte. The spray electrode 62 is constructed in the same way as the spray electrode 6 and for positioning and spray electrode voltage this applies in connection with the spray electrode 6 said.

Figur 3Figure 3

Als Unterschied zu der im Zusammenhang mit Figur 1 beschriebenen Ausführungsvariante wird der Druckformzylinder 22 mittels einer Vielzahl leitender Spitzen 8 von innen her und nicht mittels einer Sprühelektrode von aussen her lokal negativ aufgeladen.As a difference to that described in connection with Figure 1 The printing form cylinder becomes a variant 22 by means of a plurality of conductive tips 8 from the inside and not locally by means of a spray electrode negatively charged.

Der Druckformzylinder 22 weist einen isolierenden Kern 220 und einen halbleitenden Mantel 221 auf. Der isolierende Kern 220 hat vorzugsweise einen spezifischen Widerstand grösser als 1 GΩcm, während der halbleitende Mantel 221 vorzugsweise einen spezifischen Widerstand zwischen 20 MΩcm und 50 MΩcm aufweist.The printing form cylinder 22 has an insulating core 220 and a semiconductive jacket 221. The isolating one Core 220 preferably has a resistivity greater than 1 GΩcm, while the semiconducting jacket 221 preferably a specific resistance between 20 MΩcm and 50 MΩcm.

Figur 4Figure 4

Ist in der Ausführungsvariante gemäss Figur 3 die Substratübertragung vom Druckformzylinder 22 auf das Medium 7 ungenügend, was z.B. bei einem stark isolierenden Medium 7 der Fall sein kann, kann anstelle des geerdeten Gegendruckzylinders 3 ein Gegendruckzylinder 31 verwendet werden, der mittels einer Vielzahl leitender Spitzen 81 von innen her lokal positiv aufgeladen wird, so dass in dem Bereich, wo der Gegendruckzylinder 31 das Medium 7 gegen den Druckformzylinder 22 drückt, das elektrische Feld verstärkt wird.3 is the substrate transfer insufficient from the form cylinder 22 to the medium 7, what e.g. with a highly insulating medium 7 the Case can be instead of the grounded impression cylinder 3 an impression cylinder 31 can be used, the by means of a plurality of conductive tips 81 from the inside is positively charged locally, so in the area where the impression cylinder 31 the medium 7 against the printing form cylinder 22 presses, the electric field is amplified.

Der Gegendruckzylinder 31 weist einen isolierenden Kern 310 und einen halbleitenden Mantel 311 auf. Der isolierende Kern 310 hat vorzugsweise einen spezifischen Widerstand grösser als 1 GΩcm, während der halbleitende Mantel 311 vorzugsweise einen spezifischen Widerstand zwischen 20 MΩcm und 50 MΩcm aufweist. The impression cylinder 31 has an insulating core 310 and a semiconducting jacket 311. The isolating one Core 310 preferably has a resistivity greater than 1 GΩcm, while the semiconducting jacket 311 preferably a specific resistance between 20 MΩcm and 50 MΩcm.

Figur 5Figure 5

In dieser Ausführungsvariante wird zwischen der Substratübertragungswalze 1 und dem Druckformzylinder 21 vorhandenes Substrat 4' bei Rotation der Substratübertragungswalze 1 in Richtung des Pfeils A' und des Druckformzylinders 21 in Richtung des Pfeils B' auf den Druckformzylinder 21 übertragen. Die erforderliche Substratübertragungsmenge kann über den Anpressdruck der Substratübertragungswalze 1 gegen den Druckformzylinder 21 gesteuert werden.In this embodiment variant is between the substrate transfer roller 1 and the printing form cylinder 21 available Substrate 4 'when the substrate transfer roller rotates 1 in the direction of arrow A 'and the printing form cylinder 21 in the direction of arrow B 'onto the printing form cylinder 21 transfer. The amount of substrate transfer required can via the contact pressure of the substrate transfer roller 1 can be controlled against the printing form cylinder 21.

Um eine bessere Substratübertragung zu erreichen, wird wiederum der Druckformzylinder 21 in der Nähe des Substratübertragungsbereichs mittels einer Sprühelektrode 61 lokal negativ aufgeladen, so dass im Substratübertragungsbereich ein elektrisches Feld aufgebaut wird. Die Sprühelektrode 61 muss in dieser Ausführungsvariante allerdings unterhalb des Substratübertragungsbereichs positioniert werden, so dass durch die Rotation des Druckformzylinders 21 der geladene Bereich des Druckformzylinders 21 nicht zum Substratübertragungsbereich hingedreht, sondern von diesem weggedreht wird, was eine höhere Sprühelektrodenspannung notwendig macht. Um die Anordnung der Sprühelektrode 61 zwischen dem Medium 7 und dem Substratübertragungsbereich zu ermöglichen, wird diese geknickt ausgebildet.To achieve better substrate transfer, again the printing form cylinder 21 in the vicinity of the substrate transfer region locally by means of a spray electrode 61 negatively charged so that in the substrate transfer area an electric field is established. The spray electrode 61 In this variant, however, it must be below the Substrate transfer area to be positioned so that by the rotation of the printing form cylinder 21 the loaded Area of the printing form cylinder 21 not to the substrate transfer area turned, but turned away from it becomes what a higher spray electrode voltage is necessary makes. To the arrangement of the spray electrode 61 between the To enable medium 7 and the substrate transfer region, this is formed kinked.

Der Druckformzylinder 21 weist einen isolierenden Kern 210 und einen halbleitenden Mantel 211 auf. Der isolierende Kern 210 hat vorzugsweise einen spezifischen Widerstand grösser als 1 GΩcm, während der halbleitende Mantel 211 einen spezifischen Widerstand zwischen 0,5 MΩcm und 50 MΩcm, vorzugsweise zwischen 0,5 MΩcm und 10 MΩcm aufweist.The printing form cylinder 21 has an insulating core 210 and a semiconductive jacket 211. The isolating one Core 210 preferably has a resistivity greater than 1 GΩcm, while the semiconducting jacket 211 a specific resistance between 0.5 MΩcm and 50 MΩcm, preferably between 0.5 MΩcm and 10 MΩcm.

Ein Gegendruckzylinder 32, der einen isolierenden Kern 320 und einen geerdeten Mantel 321 umfasst, ist parallelachsig zum Druckformzylinder 21 so angeordnet, dass er ein Medium 7 gegen den Druckformzylinder 21 drückt. Bei Rotation des Druckformzylinders 21 in Richtung des Pfeils B' rotiert der Gegendruckzylinder 32 in Richtung des Pfeils C' und das Medium 7 bewegt sich in Richtung des Pfeils D'. Der lokal geladene Teil des Druckformzylinders 21 und das an seiner Oberfläche haftende Substrat 4 wird bei dieser Rotation ebenfalls mitgedreht. In dem Bereich, wo der Gegendruckzylinder 32 das Medium 7 gegen den Druckformzylinder 21 drückt, wird dadurch ein zweites elektrisches Feld aufgebaut, das das Medium 7 durchsetzt. Damit wird eine gute Substratübertragung vom Druckformzylinder 21 auf das Medium 7 gewährleistet.An impression cylinder 32, which has an insulating core 320 and comprises a grounded jacket 321 is parallel-axis to the plate cylinder 21 arranged so that it is a medium 7 presses against the printing form cylinder 21. When rotating the Printing form cylinder 21 rotates in the direction of arrow B ' Impression cylinder 32 in the direction of arrow C 'and the medium 7 moves in the direction of arrow D '. The locally loaded one Part of the printing form cylinder 21 and that on it Surface adhering substrate 4 becomes during this rotation also filmed. In the area where the impression cylinder 32 the medium 7 against the printing form cylinder 21 a second electric field is built up, that penetrates the medium 7. This will be a good one Substrate transfer from the printing form cylinder 21 to the medium 7 guaranteed.

Figur 6Figure 6

Ist in der im Zusammenhang mit Figur 5 beschriebenen Ausführungsvariante die Substratübertragung vom Druckformzylinder 21 auf das Medium 7 ungenügend, was z.B. bei einem stark isolierenden Medium 7 der Fall sein kann, kann anstelle des erwähnten Gegendruckzylinders 32 ein Gegendruckzylinder 34 verwendet werden, der mittels einer zweiten Sprühelektrode 62 lokal positiv aufgeladen wird, so dass in dem Bereich, wo der Gegendruckzylinder 34 das Medium 7 gegen den Druckformzylinder 21 drückt, das elektrische Feld verstärkt wird. Is in the embodiment variant described in connection with Figure 5 the substrate transfer from the printing form cylinder 21 insufficient on the medium 7, which e.g. at a highly insulating medium 7 may be the case instead of the mentioned impression cylinder 32 is an impression cylinder 34 can be used by means of a second Spray electrode 62 is positively charged locally, so that in the area where the impression cylinder 34 holds the medium 7 presses against the printing form cylinder 21, the electric field is reinforced.

Der Gegendruckzylinder 34 weist einen isolierenden Kern 340 und einen halbleitenden Mantel 341 auf. Der isolierende Kern 340 hat vorzugsweise einen spezifischen Widerstand grösser als 1 GΩcm, während der halbleitende Mantel 341 einen spezifischen Widerstand zwischen 0,5 MΩcm und 50 MΩcm, vorzugsweise zwischen 0,5 MΩcm und 10 MΩcm aufweist.The impression cylinder 34 has an insulating core 340 and a semiconductive jacket 341. The isolating one Core 340 preferably has a resistivity greater than 1 GΩcm, while the semiconducting jacket 341 a specific resistance between 0.5 MΩcm and 50 MΩcm, preferably between 0.5 MΩcm and 10 MΩcm.

Die Sprühelektrode 62 ist gleich aufgebaut wie die Sprühelektrode 6 und für die Positionierung und die Sprühelektrodenspannung gilt das im Zusammenhang mit der Sprühelektrode 6 Gesagte.The spray electrode 62 is constructed in the same way as the spray electrode 6 and for positioning and spray electrode voltage this applies in connection with the spray electrode 6 said.

Figur 7Figure 7

Als Unterschied zu der im Zusammenhang mit Figur 5 beschriebenen Ausführungsvariante wird der Druckformzylinder 22 mittels einer Vielzahl leitender Spitzen 8 von innen her und nicht mittels einer Sprühelektrode von aussen her lokal negativ aufgeladen.As a difference to that described in connection with Figure 5 The printing form cylinder becomes a variant 22 by means of a plurality of conductive tips 8 from the inside and not locally by means of a spray electrode negatively charged.

Der Druckformzylinder 22 weist einen isolierenden Kern 220 und einen halbleitenden Mantel 221 auf. Der isolierende Kern 220 hat vorzugsweise einen spezifischen Widerstand grösser als 1 GΩcm, während der halbleitende Mantel 221 vorzugsweise einen spezifischen Widerstand zwischen 20 MΩcm und 50 MΩcm aufweist.The printing form cylinder 22 has an insulating core 220 and a semiconductive jacket 221. The isolating one Core 220 preferably has a resistivity greater than 1 GΩcm, while the semiconducting jacket 221 preferably a specific resistance between 20 MΩcm and 50 MΩcm.

Als Gegendruckzylinder kann wie dargestellt anstelle des Gegendruckzylinder 32 ein geerdeter Gegendruckzylinder 3 verwendet werden. As a counter-pressure cylinder can, as shown, instead of Impression cylinder 32 is an earthed impression cylinder 3 be used.

Figur 8Figure 8

Ist in der Ausführungsvariante gemäss Figur 7 die Substratübertragung vom Druckformzylinder 22 auf das Medium 7 ungenügend, was z.B. bei einem stark isolierenden Medium 7 der Fall sein kann, kann anstelle des geerdeten Gegendruckzylinders 3 ein Gegendruckzylinder 31 verwendet werden, der mittels einer Vielzahl leitender Spitzen 81 von innen her lokal positiv aufgeladen wird, so dass in dem Bereich, wo der Gegendruckzylinder 31 das Medium 7 gegen den Druckformzylinder 22 drückt, das elektrische Feld verstärkt wird.In the embodiment variant according to FIG. 7, the substrate transfer insufficient from the form cylinder 22 to the medium 7, what e.g. with a highly insulating medium 7 the Case can be instead of the grounded impression cylinder 3 an impression cylinder 31 can be used, the by means of a plurality of conductive tips 81 from the inside is positively charged locally, so in the area where the impression cylinder 31 the medium 7 against the printing form cylinder 22 presses, the electric field is amplified.

Der Gegendruckzylinder 31 weist einen isolierenden Kern 310 und einen halbleitenden Mantel 311 auf. Der isolierende Kern 310 hat vorzugsweise einen spezifischen Widerstand grösser als 1 GΩcm, während der halbleitende Mantel 311 vorzugsweise einen spezifischen Widerstand zwischen 20 MΩcm und 50 MΩcm aufweist.The impression cylinder 31 has an insulating core 310 and a semiconducting jacket 311. The isolating one Core 310 preferably has a resistivity greater than 1 GΩcm, while the semiconducting jacket 311 preferably a specific resistance between 20 MΩcm and 50 MΩcm.

Figur 9Figure 9

Der Vorderteil der verwendeten Sprühelektroden 6, 61, 62 weist als ladungsübertragendes Teil ein langgezogenes Schwert 600 mit einer Kante 601 auf. Das Schwert 600 ist mittels einer Messinghülse 602 an einem Trägerelement 603 befestigt und in einem Gehäuse 604 angebracht, welches nach vorne offen und abgeschrägt ausgebildet ist. Dadurch wird die Ladungssprühung auf einen bestimmten Winkelbereich beschränkt. The front part of the spray electrodes 6, 61, 62 used has an elongated as a charge-transferring part Sword 600 with an edge 601. The sword is 600 by means of a brass sleeve 602 on a carrier element 603 attached and mounted in a housing 604, which according to open at the front and bevelled. This will the charge spray is limited to a certain angular range.

Zu den vorbeschriebenen Verfahren und Vorrichtungen zur elektrostatischen Substratübertragung sind weitere Variationen realisierbar. Hier ausdrücklich erwähnt seien noch:

  • Die Substratübertragungswalze 1 kann anstatt durch Eintauchen in das im Substratbehälter 9 vorhandene Substrat 4' auch mittels einer Substratkassette mit Substrat versehen werden. Um die Substratübertragung von der Kassette auf die Substratübertragungswalze 1 zu verbessern, wird vorteilhafterweise die Substratkassette geerdet und die Substratübertragungswalze 1 zumindest in der Nähe des Bereichs, in dem die Substratübertragung erfolgt, aufgeladen. Hierzu wird die äusserste Mantelschicht der Substratübertragungswalze 1 leitend oder halbleitend ausgebildet. Die Aufladung erfolgt dann entweder über den Druckformzylinder 2, 21, 22 oder lokal mittels einer Ladeeinrichtung, die z.B. eine Sprühelektrode, eine leitende Walze, einen leitenden Besen oder im Innern der Substratübertragungswalze angeordnete leitende Spitzen umfasst.
  • Die lokale Aufladung des Druckformzylinders bzw. des Gegendruckzylinders kann mit anderen als den erwähnten Ladeeinrichtungen erfolgen. Die erwähnten Sprühelektroden 6, 61, 62 müssen nicht unbedingt schwertförmig ausgebildet sein. Eine Aufladung von aussen kann z.B. mit einer Vielzahl von Spitzen vorgenommen werden.
  • Der Druckformzylinder 2, 21, 22 kann auch positiv anstelle von negativ lokal aufgeladen werden. Der Gegendruckzylinder 31, 33 wird dann nötigenfalls entsprechend negativ lokal aufgeladen. Der Druckformzylinder und der Gegendruckzylinder müssen nicht mit einer gleichartigen Ladeeinrichtung lokal aufgeladen werden. Der Druckformzylinder kann z.B. von aussen mittels einer Sprühelektrode und der Gegendruckzylinder von innen mittels leitender Spitzen aufgeladen werden. Beliebige Kombinationen sind möglich.
  • Die Substratübertragungswalze, der Druckformzylinder und der Gegendruckzylinder können auch anders als in den beschriebenen Ausführungsvarianten aufgebaut sein. Insbesondere können sie zusätzliche Schichten aufweisen.
Further variations on the above-described methods and devices for electrostatic substrate transfer are feasible. Here are also explicitly mentioned:
  • Instead of being immersed in the substrate 4 ′ present in the substrate container 9, the substrate transfer roller 1 can also be provided with substrate by means of a substrate cassette. In order to improve the substrate transfer from the cassette to the substrate transfer roller 1, the substrate cassette is advantageously grounded and the substrate transfer roller 1 is charged at least in the vicinity of the area in which the substrate transfer takes place. For this purpose, the outermost cladding layer of the substrate transfer roller 1 is made conductive or semi-conductive. The charging then takes place either via the printing form cylinder 2, 21, 22 or locally by means of a charging device which comprises, for example, a spray electrode, a conductive roller, a conductive broom or conductive tips arranged in the interior of the substrate transfer roller.
  • The local charging of the printing form cylinder or the impression cylinder can take place with charging devices other than those mentioned. The spray electrodes 6, 61, 62 mentioned do not necessarily have to be sword-shaped. External charging can be carried out with a variety of tips, for example.
  • The printing form cylinder 2, 21, 22 can also be charged locally positively instead of negatively. The impression cylinder 31, 33 is then charged accordingly locally negatively if necessary. The printing form cylinder and the impression cylinder do not have to be charged locally with a similar charging device. The printing form cylinder can, for example, be charged from the outside by means of a spray electrode and the impression cylinder from the inside by means of conductive tips. Any combination is possible.
  • The substrate transfer roller, the printing form cylinder and the impression cylinder can also be constructed differently than in the described embodiment variants. In particular, they can have additional layers.

Claims (12)

  1. Process for electrostatic substance transfer, in which a substance (4) is transferred from a substance transfer roller (1) onto a printing forme cylinder (2, 21, 22) and from there onto a medium (7) which is pressed against the printing forme cylinder (2, 21, 22) by a back-pressure cylinder (3, 31, 32, 33, 34), characterized in that the printing forme cylinder (2, 21, 22) is charged by a charging device (6, 8, 61) locally near to the region in which the substance transfer from the substance transfer roller (1) onto the printing forme cylinder (2, 21, 22) takes place.
  2. Process according to claim 1, characterized in that the back-pressure cylinder (31, 33, 34) is charged locally near to the region in which it presses the medium (7) against the printing forme cylinder (2, 21, 22) with a charge of an opposite sign to the charge of the printing forme cylinder (2, 21, 22).
  3. Process according to claim 1 or 2, characterized in that the substance transfer roller (1) is provided with substance (4, 4') from a substance container (9) or a substance cartridge.
  4. Process according to claim 3, characterized in that the substance transfer roller (1) is charged at least near to the region in which the substance transfer from the substance cartridge onto the substance transfer roller (1) takes place.
  5. Process according to one of claims 1 to 4, characterized in that the substance (4, 4') consists of printing ink, varnish, priming ink or varnish, cold sealing compound, glue or wax and/or the medium (7) consists of paper, card, foil, plastic, wood, glass, aluminium or materials coated with aluminium.
  6. Apparatus for carrying out the process according to one of claims 1 to 5, having a substance transfer roller (1), a printing forme cylinder (2, 21, 22) and a back-pressure cylinder (3, 31, 32, 33, 34), characterized in that it has a charging device (6, 8, 61) for the local charging of the printing forme cylinder (2, 21, 22).
  7. Apparatus according to claim 6, characterized in that it has a charging device (62, 81) for the local charging of the back-pressure cylinder (31, 33, 34).
  8. Apparatus according to claim 6 or 7, characterized in that the charging device for the local charging of the printing forme cylinder (2, 21) or of the back-pressure cylinder (33, 34) comprises a spray electrode (6, 61, 62) which is arranged in such a way that the charging takes place from the outside in the desired region of the printing forme cylinder (2, 21) or of the back-pressure cylinder (33, 34).
  9. Apparatus according to claim 6 or 7, characterized in that the charging device for the local charging of the printing forme cylinder or of the back-pressure cylinder comprises a conducting roller or a conducting brush which is arranged in such a way that the charging takes place by contact from the outside in the desired region of the printing forme cylinder or of the back-pressure cylinder.
  10. Apparatus according to claim 6 or 7, characterized in that the charging device for the local charging of the printing forme cylinder (22) or of the back-pressure cylinder (31) comprises conducting tips (8, 81) which are arranged inside the corresponding cylinder in such a way that the charging takes place from the inside in the desired region of the printing forme cylinder (22) or of the back-pressure cylinder (31).
  11. Apparatus according to one of claims 6 to 10, having a substance cartridge to carry out the process according to claim 4, characterized in that the substance cartridge is earthed and the outermost layer of casing of the substance transfer roller (1) is designed to be conducting or semiconducting.
  12. Apparatus according to claim 11, characterized in that it has a charging device for local charging of the outermost layer of casing of the substance transfer roller (1), which charging device comprises a spray electrode, a conducting roller, a conducting brush or conducting tips arranged inside the substance transfer roller (1).
EP96810532A 1995-08-18 1996-08-12 Method and means for transferring a substrate with electrostatic support Expired - Lifetime EP0761458B1 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
CH2370/95 1995-08-18
CH237095 1995-08-18
CH237095 1995-08-18
CH675/96 1996-03-14
CH00675/96A CH691584A5 (en) 1995-08-18 1996-03-14 Method and apparatus for electrostatic substance transfer.
CH67596 1996-03-14

Publications (2)

Publication Number Publication Date
EP0761458A1 EP0761458A1 (en) 1997-03-12
EP0761458B1 true EP0761458B1 (en) 2001-07-18

Family

ID=25685331

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96810532A Expired - Lifetime EP0761458B1 (en) 1995-08-18 1996-08-12 Method and means for transferring a substrate with electrostatic support

Country Status (6)

Country Link
US (1) US5829355A (en)
EP (1) EP0761458B1 (en)
JP (1) JPH09118007A (en)
AT (1) ATE203208T1 (en)
CH (1) CH691584A5 (en)
DE (1) DE59607298D1 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN107848313A (en) * 2015-08-14 2018-03-27 Sig技术股份公司 Electrostatic for the package lamina material of the food containers of the dimensionally stable including creased packaging laminate aids in printing

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JPH11506965A (en) * 1996-03-22 1999-06-22 ザ、プロクター、エンド、ギャンブル、カンパニー Method of folding using an electrostatic charge to keep the folded material straight
ATE213997T1 (en) * 1997-11-27 2002-03-15 Spengler Electronic Ag ELECTROSTATIC ARRANGEMENT FOR A GRAPHIC AND FLEXO PRINTING UNIT
US6598523B1 (en) * 1998-08-17 2003-07-29 Sagawa Printing Co., Ltd. Gravure printing method
US6314879B1 (en) 1999-05-12 2001-11-13 Hurletron Incorporated Flexographic printing apparatus
DE10125257B4 (en) * 2001-05-23 2005-08-11 Man Roland Druckmaschinen Ag Short inking unit for a rotary printing press and method for improving the ink splitting in such a short inking unit
US6644196B2 (en) * 2001-11-05 2003-11-11 Heidelberger Druckmaschinen Ag Electrorheological inker
DE102016209350A1 (en) * 2016-05-30 2017-11-30 Sig Technology Ag Electrostatically assisted printing of a packaging laminate for dimensionally stable food containers with a large number of printing units

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GB608902A (en) * 1945-03-01 1948-09-22 Goss Printing Press Co Ltd Improvements in or relating to printing apparatus
US2558901A (en) * 1945-04-27 1951-07-03 William C Huebner Electric printing system
US2483462A (en) * 1945-05-03 1949-10-04 William C Huebner Process and apparatus for electronographic printing
US4697514A (en) * 1965-10-07 1987-10-06 Gravure Association Of America Method and apparatus for transferring ink in gravure printing
US3443517A (en) * 1967-01-04 1969-05-13 Xerox Corp Electrostatic duplicating system employing relief printing plate
US3738266A (en) * 1967-07-25 1973-06-12 Matsushita Electric Ind Co Ltd Electronic printing device
US3661081A (en) * 1968-11-01 1972-05-09 Hurletron Controls Division Process of flexographic printing utilizing an electrical field
US4440082A (en) * 1978-11-13 1984-04-03 Dayco Corporation Electrostatically assisted printing system
EP0409570A3 (en) * 1989-07-21 1991-09-18 Canon Kabushiki Kaisha Method of supplying viscous substance

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107848313A (en) * 2015-08-14 2018-03-27 Sig技术股份公司 Electrostatic for the package lamina material of the food containers of the dimensionally stable including creased packaging laminate aids in printing

Also Published As

Publication number Publication date
DE59607298D1 (en) 2001-08-23
CH691584A5 (en) 2001-08-31
JPH09118007A (en) 1997-05-06
US5829355A (en) 1998-11-03
ATE203208T1 (en) 2001-08-15
EP0761458A1 (en) 1997-03-12

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