EP4098769A2 - Intaglio printing plate with extended service life and method for the production of same - Google Patents

Intaglio printing plate with extended service life and method for the production of same Download PDF

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Publication number
EP4098769A2
EP4098769A2 EP22020244.4A EP22020244A EP4098769A2 EP 4098769 A2 EP4098769 A2 EP 4098769A2 EP 22020244 A EP22020244 A EP 22020244A EP 4098769 A2 EP4098769 A2 EP 4098769A2
Authority
EP
European Patent Office
Prior art keywords
intaglio printing
printing plate
adhesion
copper
abrasion
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.)
Pending
Application number
EP22020244.4A
Other languages
German (de)
French (fr)
Other versions
EP4098769A3 (en
Inventor
Christoph Mengel
Reinhard Plaschka
Christian Schulze
Hubert Petratschek
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giesecke and Devrient Currency Technology GmbH
Original Assignee
Giesecke and Devrient Currency Technology GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Giesecke and Devrient Currency Technology GmbH filed Critical Giesecke and Devrient Currency Technology GmbH
Publication of EP4098769A2 publication Critical patent/EP4098769A2/en
Publication of EP4098769A3 publication Critical patent/EP4098769A3/en
Pending legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
    • C23C22/08—Orthophosphates
    • C23C22/12—Orthophosphates containing zinc cations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/04—Printing plates or foils; Materials therefor metallic
    • B41N1/06—Printing plates or foils; Materials therefor metallic for relief printing or intaglio printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N3/00—Preparing for use and conserving printing surfaces
    • B41N3/003—Preparing for use and conserving printing surfaces of intaglio formes, e.g. application of a wear-resistant coating, such as chrome, on the already-engraved plate or cylinder; Preparing for reuse, e.g. removing of the Ballard shell; Correction of the engraving
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
    • C23C28/021—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material including at least one metal alloy layer
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/10—Electroplating with more than one layer of the same or of different metals
    • C25D5/12—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium
    • C25D5/14—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium two or more layers being of nickel or chromium, e.g. duplex or triplex layers
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/06—Wires; Strips; Foils
    • C25D7/0614—Strips or foils
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/04—Tubes; Rings; Hollow bodies

Definitions

  • the invention relates to an intaglio printing plate which consists of brass, steel, copper or an alloy with brass and/or steel and/or copper and has an abrasion-reducing layer arranged on its surface facing a substrate to be printed.
  • the invention further relates to a method for producing such an intaglio printing plate.
  • the intaglio printing process is usually used. It is characterized by the fact that linear or punctiform indentations are introduced into an intaglio printing plate, which are partially or completely filled with ink.
  • a substrate such as paper
  • a substrate is pressed into the depressions of the intaglio printing plate with high pressure, so that the ink is transferred to the substrate and the substrate is deformed.
  • the intaglio printing plates used Due to the high line pressure, the permanent wiping process and the abrasive components in the substrate and ink in the intaglio printing process, the intaglio printing plates used must be provided with an abrasion-reducing layer that enables a sufficient service life of around 1,000,000 cycles.
  • a chromium layer as an abrasion-reducing layer to the surface of an intaglio printing plate, which can be deposited either galvanically or in the gas phase (physical vapor deposition—PVD).
  • PVD physical vapor deposition
  • EP 0906193 A1 and EP 2039529 A2 It is known to introduce the depressions to be printed or embossed directly into the surface of an intaglio printing plate by means of a processing module.
  • the processing module is a mechanical milling module for mechanical engraving or a laser module for laser engraving or a scoring module for scoring or turning.
  • This intaglio printing plate is produced without galvanic molding from a master.
  • nickel is not suitable as a material for these intaglio printing plates, so they consist of brass, steel, copper or an alloy with brass and/or steel and/or copper. In the case of brass, steel, copper or an alloy with brass and/or steel and/or copper, there is a sufficiently high removal rate while at the same time being harmless to health.
  • the adhesion of a layer of chromium on a workpiece made of brass is not sufficient and that the chromium layer detaches from the brass at an early stage.
  • the layer thickness of the chrome layer plays a subordinate role here.
  • the layer applied in the galvanic process with a layer thickness of approx. 4 ⁇ m to 6 ⁇ m is thicker than the layer vapor-deposited by means of PVD with a layer thickness of approx. 1 ⁇ m to 2 ⁇ m, but both detach.
  • the object of the invention is to improve the service life of intaglio printing plates which are provided with a wear-reducing layer and are made of brass, steel, copper or an alloy with brass and/or steel and/or copper.
  • an adhesion-promoting layer is arranged between the surface of the intaglio printing plate made of brass, steel, copper or an alloy with brass and/or steel and/or copper and the abrasion-reducing layer.
  • an intaglio printing plate which consists of brass, steel, copper or an alloy with brass and/or steel and/or copper, then onto the surface of the intaglio printing plate facing a substrate to be printed an adhesion-promoting layer is applied and then an abrasion-reducing layer is applied to the adhesion-promoting layer.
  • this adhesion-promoting layer should be kept as small as possible; the thickness is preferably 0.05 ⁇ m to 5 ⁇ m. An even, homogeneous wetting of the surface of the intaglio printing plate with the adhesion-promoting layer must be ensured.
  • the adhesion promoter layer can be applied to the intaglio printing plate either chemically, electrolytically or with a PVD process, or with a dipping or spraying process. After this, the abrasion-reducing layer is then applied to the adhesion promoter layer, preferably galvanically or using a PVD process.
  • the intaglio printing plate, the abrasion-reducing layer and the adhesion-promoting layer have different metals.
  • the intaglio printing plate has an electrochemically nobler metal than the metal of the abrasion-reducing layer.
  • the adhesion promoting layer has a metal whose electrochemical potential lies between the electrochemical potential of the metal of the intaglio printing plate and the electrochemical potential of the metal of the abrasion-reducing layer. The large electrochemical potential difference between the metal of the intaglio printing plate and the metal of the abrasion-reducing layer results in reduced adhesion between the intaglio printing plate and the abrasion-reducing layer.
  • the electrochemical potential of the metal of the adhesion promoting layer lies between the electrochemical potential of the metal of the intaglio printing plate and the electrochemical potential of the metal the abrasion-reducing layer. According to current opinion, this gradation of the difference in the electrochemical potential ultimately leads to an improvement in the adhesion of the abrasion-reducing layer to the intaglio printing plate.
  • the wear-reducing layer consists of chromium.
  • the adhesion promoting layer particularly preferably consists of nickel, copper or an alloy with nickel and/or copper.
  • nickel is preferably used in the case of an intaglio printing plate made of brass.
  • multi-layer systems such as, for example, copper and nickel are preferably used in order to generate a graded electrochemical potential difference between the intaglio printing plate and the wear-reducing layer.
  • the adhesion-promoting layer consists of a zinc phosphate treatment which brings about a chemical activation of the intaglio printing plate or the intaglio printing cylinder.
  • the surface of an intaglio printing plate has indentations to be printed or embossed, with the indentations to be printed or embossed being introduced directly into the surface of an intaglio printing plate by means of a processing module before the adhesion-promoting layer and the abrasion-reducing layer are applied to the intaglio printing plate.
  • the processing module is in particular a mechanical milling module for mechanical engraving or a laser module for laser engraving or a scoring module for scoring or turning.
  • the intaglio printing plate is particularly preferred already before the introduction of the indentations to be printed or embossed, it is bent or designed in the form of a roller, so that it can be clamped directly onto an intaglio printing cylinder or already forms one.
  • the intaglio printing plate according to the invention consists of brass, steel, copper or an alloy with brass and/or steel and/or copper.
  • the intaglio printing plate preferably consists essentially or for the most part of the materials mentioned, wherein further materials such as carbon can be added to a small extent to the materials mentioned in order to influence or improve the mechanical properties of the intaglio printing plate.
  • a particular advantage of the invention is that the improved adhesion of the abrasion-reducing layer on the intaglio printing plate leads to an increase in the service life of intaglio printing plates provided with an abrasion-reducing layer made of brass, steel or copper or an alloy with brass and/or steel and/or copper.
  • Documents of value that can be printed with an intaglio printing plate according to the invention are, in particular, banknotes, stocks, bonds, certificates, vouchers, checks, high-quality admission tickets, but also other papers at risk of forgery, such as passports and other identification documents, and cards, such as credit or debit cards, whose card body has at least one layer of security paper, and also product security elements such as labels, seals, packaging, folding boxes, package inserts and the like.
  • the simplified term document of value includes all of the above materials, documents and product security means.
  • the substrate to be printed in such documents of value particularly preferably consists of paper made from cotton fibers, as is the case, for example used for banknotes, or of other natural fibers, or of synthetic fibers, or of a mixture of natural and synthetic fibers, or of at least one plastic film.
  • the substrate preferably consists of a combination of at least two different substrates arranged one above the other and connected to one another, a so-called hybrid.
  • the substrate consists, for example, of a combination of plastic film-paper-plastic film, ie a substrate made of paper is covered on each of its two sides by a plastic film, or of a combination of paper-plastic film-paper, ie a substrate made of a plastic film is covered on each of its covered with paper on both sides.
  • the advantages of the invention are explained on the basis of the following exemplary embodiment and the supplementary figures.
  • the exemplary embodiment represents a preferred embodiment to which, however, the invention is not intended to be limited in any way.
  • the illustrations in the figures are highly schematic for better understanding and do not reflect the real situation.
  • the proportions shown in the figures do not correspond to the conditions present in reality and are used solely to improve clarity.
  • the embodiment described in the following exemplary embodiment is reduced to the essential core information for the sake of better comprehensibility. In practical implementation much more complex embodiments can be used.
  • Figures 1 and 2 show schematically an intaglio printing plate 1, which consists of brass, steel, copper or an alloy with brass and/or steel and/or copper and on whose surface, which faces a substrate to be printed, an abrasion-reducing layer 2, also chromium, is arranged. Between the surface of the intaglio printing plate 1 and the abrasion-reducing layer 2 there is an adhesion-promoting layer 3 made of nickel, copper or an alloy with nickel and/or copper or made of a zinc phosphate coating. The thickness of the adhesion-promoting layer is 0.05 ⁇ m to 5 ⁇ m.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Printing Plates And Materials Therefor (AREA)

Abstract

Die Erfindung betrifft eine Stichtiefdruckplatte, die aus Messing, Stahl, Kupfer oder einer Legierung mit Messing und/oder Stahl und/oder Kupfer besteht und auf deren Oberfläche, die einem zu bedruckenden Substrat zugewandt ist, eine abriebvermindernde Schicht angeordnet ist. Die Erfindung betrifft weiterhin ein Verfahren zur Herstellung einer derartigen Stichtiefdruckplatte.Erfindungsgemäß ist zwischen der Oberfläche der Stichtiefdruckplatte aus Messing, Stahl, Kupfer oder einer Legierung mit Messing und/oder Stahl und/oder Kupfer und der abriebvermindernden Schicht eine Haftvermittlungsschicht angeordnet. Bei dem erfindungsgemäßen Verfahren wird zunächst eine Stichtiefdruckplatte bereitgestellt, die aus Messing, Stahl, Kupfer oder einer Legierung mit Messing und/oder Stahl und/oder Kupfer besteht, anschließend auf die Oberfläche der Stichtiefdruckplatte, die einem zu bedruckenden Substrat zugewandt ist, eine Haftvermittlungsschicht aufgebracht und daran anschließend auf die Haftvermittlungsschicht eine abriebvermindernde Schicht aufgebracht.The invention relates to an intaglio printing plate which consists of brass, steel, copper or an alloy with brass and/or steel and/or copper and has an abrasion-reducing layer arranged on its surface facing a substrate to be printed. The invention also relates to a method for producing such an intaglio printing plate. According to the invention, an adhesion-promoting layer is arranged between the surface of the intaglio printing plate made of brass, steel, copper or an alloy with brass and/or steel and/or copper and the abrasion-reducing layer. In the method according to the invention, an intaglio printing plate is first provided, which consists of brass, steel, copper or an alloy with brass and/or steel and/or copper, and then an adhesion-promoting layer is applied to the surface of the intaglio printing plate that faces a substrate to be printed and an abrasion-reducing layer is then applied to the adhesion-promoting layer.

Description

Die Erfindung betrifft eine Stichtiefdruckplatte, die aus Messing, Stahl, Kupfer oder einer Legierung mit Messing und/oder Stahl und/oder Kupfer besteht und auf deren Oberfläche, die einem zu bedruckenden Substrat zugewandt ist, eine abriebvermindernde Schicht angeordnet ist. Die Erfindung betrifft weiterhin ein Verfahren zur Herstellung einer derartigen Stichtiefdruckplatte.The invention relates to an intaglio printing plate which consists of brass, steel, copper or an alloy with brass and/or steel and/or copper and has an abrasion-reducing layer arranged on its surface facing a substrate to be printed. The invention further relates to a method for producing such an intaglio printing plate.

Beim Druck von hochwertigen Druck-Erzeugnissen, wie Wertpapieren, Banknoten oder ähnlichem wird üblicherweise das Stichtiefdruckverfahren benutzt. Es zeichnet sich dadurch aus, dass in eine Stichtiefdruckplatte linien- oder punktförmige Vertiefungen eingebracht sind, die teilweise oder vollständig mit Farbe gefüllt werden. Ein Substrat, wie beispielsweise Papier, wird mit hohem Druck in die Vertiefungen der Stichtiefdruckplatte gepresst, so dass die Farbe auf das Substrat übertragen und das Substrat verformt wird. Alternativ ist es auch möglich, die Vertiefungen in der Stichtiefdruckplatte nicht mit Farbe zu füllen, so dass das Substrat ohne Farbauftrag lediglich verformt bzw. geprägt wird. In beiden Fällen entstehen auf dem Substrat erhabene und fühlbare Strukturen.When printing high-quality printed products, such as securities, banknotes or the like, the intaglio printing process is usually used. It is characterized by the fact that linear or punctiform indentations are introduced into an intaglio printing plate, which are partially or completely filled with ink. A substrate, such as paper, is pressed into the depressions of the intaglio printing plate with high pressure, so that the ink is transferred to the substrate and the substrate is deformed. Alternatively, it is also possible not to fill the depressions in the intaglio printing plate with ink, so that the substrate is only deformed or embossed without the application of ink. In both cases, raised and tactile structures are formed on the substrate.

Aus EP 1578604 A2 ist eine Vorrichtung zur Herstellung von Stichtiefdruckplatten bekannt, bei der zunächst eine einer Originalplatte in Form eines Einzel-Nutzens erzeugt wird, aus der anschließend durch mehrere galvanische Abform- und Rekombinationsschritte die Stichtiefdruckplatte hergestellt wird, deren Basismaterial üblicherweise aus Nickel besteht. Abschließend wird die ebene Stichtiefdruckplatte derartig gebogen, dass sie in einen walzenförmigen Druckzylinder eingespannt werden kann.Out of EP 1578604 A2 a device for the production of intaglio printing plates is known in which an original plate is first produced in the form of a single copy, from which the intaglio printing plate is then produced by several galvanic molding and recombination steps, the base material of which usually consists of nickel. Finally, the flat intaglio printing plate is bent in such a way that it can be clamped in a roller-shaped printing cylinder.

Durch den hohen Liniendruck, dem permanenten Wischprozess und den abrasiven Bestandteilen in Substrat und Farbe im Stichtiefdruckverfahren müssen die verwendeten Stichtiefdruckplatten mit einer abriebvermindernden Schicht versehen werden, die eine ausreichende Standzeit von etwa 1.000.000 Überrollungen ermöglicht.Due to the high line pressure, the permanent wiping process and the abrasive components in the substrate and ink in the intaglio printing process, the intaglio printing plates used must be provided with an abrasion-reducing layer that enables a sufficient service life of around 1,000,000 cycles.

Im Stand der Technik wird dies durch Aufbringung einer Chromschicht als abriebvermindernde Schicht auf die Oberfläche einer Stichtiefdruckplatte gelöst, die entweder galvanisch oder auch in der Gasphase (physical vapour deposition - PVD) abgeschieden werden kann. Beispielsweise aus EP 2836370 A2 , EP 3103650 A1 und EP 2832555 A1 ist bekannt, die galvanischer Abscheidung von Chrom aufgrund von Umweltrichtlinien durch ein andere Form der Aufbringung zu ersetzen, insbesondere durch einen PVD-Prozess.In the prior art, this is solved by applying a chromium layer as an abrasion-reducing layer to the surface of an intaglio printing plate, which can be deposited either galvanically or in the gas phase (physical vapor deposition—PVD). For example off EP 2836370 A2 , EP 3103650 A1 and EP 2832555 A1 It is known to replace the galvanic deposition of chromium by another form of application, in particular by a PVD process, due to environmental regulations.

Aus EP 0906193 A1 und EP 2039529 A2 ist bekannt, die zu druckenden oder prägenden Vertiefungen direkt mittels eines Bearbeitungsmoduls in die Oberfläche einer Stichtiefdruckplatte einzubringen. Das Bearbeitungsmodul ist hierbei ein mechanisches Fräsmodul zur mechanischen Gravur oder ein Lasermodul zur Lasergravur oder ein Ritzmodul zum Ritzen bzw. Drehen. Die Herstellung dieser Stichtiefdruckplatte erfolgt dabei ohne galvanische Abformung von einem Master. Nickel als Material für diese Stichtiefdruckplatten eignet sich aus technischen aber auch gesundheitlichen Gründen nicht, so dass sie aus Messing, Stahl, Kupfer oder einer Legierung mit Messing und/oder Stahl und/oder Kupfer bestehen. Bei Messing, Stahl, Kupfer oder einer Legierung mit Messing und/oder Stahl und/oder Kupfer ist eine ausreichend große Abtragrate bei gleichzeitiger gesundheitlicher Unbedenklichkeit gegeben.Out of EP 0906193 A1 and EP 2039529 A2 It is known to introduce the depressions to be printed or embossed directly into the surface of an intaglio printing plate by means of a processing module. The processing module is a mechanical milling module for mechanical engraving or a laser module for laser engraving or a scoring module for scoring or turning. This intaglio printing plate is produced without galvanic molding from a master. For technical reasons, but also for health reasons, nickel is not suitable as a material for these intaglio printing plates, so they consist of brass, steel, copper or an alloy with brass and/or steel and/or copper. In the case of brass, steel, copper or an alloy with brass and/or steel and/or copper, there is a sufficiently high removal rate while at the same time being harmless to health.

Aus dem Stand der Technik ist bekannt, dass die Haftung einer Schicht aus Chrom auf einem Werkstück aus Messing nicht ausreicht und dass sich die Chromschicht bereits frühzeitig vom Messing ablöst. Dies ist unabhängig vom Beschichtungsverfahren, denn sowohl galvanisch als auch mittels PVD verchromte Werkstücke weisen die genannte Haftungsschwäche auf, die Schichtdicke der Chromschicht spielt hierbei eine untergeordnete Rolle. Beispielsweise ist die im galvanischen Prozess aufgebrachte Schicht mit einer Schichtdicke von ca. 4 µm bis 6 µm dicker als die mittels PVD bedampfte Schicht mit einer Schichtdicke von ca. 1 µm bis 2 µm, beide lösen sich aber ab.It is known from the prior art that the adhesion of a layer of chromium on a workpiece made of brass is not sufficient and that the chromium layer detaches from the brass at an early stage. This is independent of the coating process, because both galvanically and PVD chrome-plated workpieces have the mentioned weak adhesion, the layer thickness of the chrome layer plays a subordinate role here. For example, the layer applied in the galvanic process with a layer thickness of approx. 4 µm to 6 µm is thicker than the layer vapor-deposited by means of PVD with a layer thickness of approx. 1 µm to 2 µm, but both detach.

Aufgabe der Erfindung ist, die Standzeit der mit einer abriebvermindernden Schicht versehenen Stichtiefdruckplatten zu verbessern, die aus Messing, Stahl, Kupfer oder einer Legierung mit Messing und/oder Stahl und/oder Kupfer bestehen.The object of the invention is to improve the service life of intaglio printing plates which are provided with a wear-reducing layer and are made of brass, steel, copper or an alloy with brass and/or steel and/or copper.

Diese Aufgabe wird durch die Merkmale der unabhängigen Ansprüche gelöst. Weiterbildungen der Erfindung sind Gegenstand der abhängigen Ansprüche.This object is solved by the features of the independent claims. Developments of the invention are the subject matter of the dependent claims.

Erfindungsgemäß ist zwischen der Oberfläche der Stichtiefdruckplatte aus Messing, Stahl, Kupfer oder einer Legierung mit Messing und/oder Stahl und/oder Kupfer und der abriebvermindernden Schicht eine Haftvermittlungsschicht angeordnet.According to the invention, an adhesion-promoting layer is arranged between the surface of the intaglio printing plate made of brass, steel, copper or an alloy with brass and/or steel and/or copper and the abrasion-reducing layer.

Bei dem erfindungsgemäßen Verfahren wird zunächst eine Stichtiefdruckplatte bereitgestellt, die aus Messing, Stahl, Kupfer oder einer Legierung mit Messing und/oder Stahl und/oder Kupfer besteht, anschließend auf die Oberfläche der Stichtiefdruckplatte, die einem zu bedruckenden Substrat zugewandt ist, eine Haftvermittlungsschicht aufgebracht und daran anschließend auf die Haftvermittlungsschicht eine abriebvermindernde Schicht aufgebracht.In the method according to the invention, an intaglio printing plate is first provided, which consists of brass, steel, copper or an alloy with brass and/or steel and/or copper, then onto the surface of the intaglio printing plate facing a substrate to be printed an adhesion-promoting layer is applied and then an abrasion-reducing layer is applied to the adhesion-promoting layer.

Die Dicke dieser Haftvermittlungsschicht sollte möglichst gering gehalten werden, bevorzugt beträgt die Dicke 0,05 µm bis 5 µm. Sicherzustellen ist eine gleichmäßige, homogene Benetzung der Oberfläche der Stichtiefdruckplatte mit der Haftvermittlungsschicht.The thickness of this adhesion-promoting layer should be kept as small as possible; the thickness is preferably 0.05 μm to 5 μm. An even, homogeneous wetting of the surface of the intaglio printing plate with the adhesion-promoting layer must be ensured.

Die Haftvermittlerschicht kann sowohl chemisch, galvanisch als auch mit einem PVD-Verfahren auf die Stichtiefdruckplatte aufgebracht werden oder aber mit einem Tauch- oder Sprühverfahren. Im Anschluss daran wird dann die abriebvermindernde Schicht auf die Haftvermittlerschicht aufgebracht, bevorzugt galvanisch oder mit einem PVD-Verfahren.The adhesion promoter layer can be applied to the intaglio printing plate either chemically, electrolytically or with a PVD process, or with a dipping or spraying process. After this, the abrasion-reducing layer is then applied to the adhesion promoter layer, preferably galvanically or using a PVD process.

Gemäß einer besonders bevorzugten Ausführungsform weisen die Stichtiefdruckplatte, die abriebvermindernde Schicht und die Haftvermittlungsschicht unterschiedliche Metalle auf. Die Stichtiefdruckplatte weist hierbei ein elektrochemisch edleres Metall auf als das Metall der abriebvermindernden Schicht. Die Haftvermittlungsschicht weist ein Metall auf, dessen elektrochemisches Potential zwischen dem elektrochemischen Potential des Metalls der Stichtiefdruckplatte und dem elektrochemischen Potential des Metalls der abriebvermindernde Schicht liegt. Durch die große elektrochemische Potentialdifferenz zwischen dem Metall der Stichtiefdruckplatte und dem Metall der abriebvermindernden Schicht ergibt sich eine verminderte Haftung zwischen der Stichtiefdruckplatte und der abriebvermindernden Schicht. Das elektrochemisches Potential des Metalls der Haftvermittlungsschicht liegt dabei zwischen dem elektrochemischen Potential des Metalls der Stichtiefdruckplatte und dem elektrochemischen Potential des Metalls der abriebvermindernde Schicht. Diese Abstufung der Differenz des elektrochemischen Potentials führt nach derzeitiger Auffassung letztendlich zu einer Verbesserung der Haftung der abriebvermindernden Schicht auf der Stichtiefdruckplatte.According to a particularly preferred embodiment, the intaglio printing plate, the abrasion-reducing layer and the adhesion-promoting layer have different metals. In this case, the intaglio printing plate has an electrochemically nobler metal than the metal of the abrasion-reducing layer. The adhesion promoting layer has a metal whose electrochemical potential lies between the electrochemical potential of the metal of the intaglio printing plate and the electrochemical potential of the metal of the abrasion-reducing layer. The large electrochemical potential difference between the metal of the intaglio printing plate and the metal of the abrasion-reducing layer results in reduced adhesion between the intaglio printing plate and the abrasion-reducing layer. The electrochemical potential of the metal of the adhesion promoting layer lies between the electrochemical potential of the metal of the intaglio printing plate and the electrochemical potential of the metal the abrasion-reducing layer. According to current opinion, this gradation of the difference in the electrochemical potential ultimately leads to an improvement in the adhesion of the abrasion-reducing layer to the intaglio printing plate.

Gemäß einer bevorzugten Ausführungsform besteht die abriebvermindernde Schicht aus Chrom.According to a preferred embodiment, the wear-reducing layer consists of chromium.

Die Haftvermittlungsschicht besteht besonders bevorzugt aus Nickel, Kupfer oder einer Legierung mit Nickel und/oder Kupfer. Bei einer Stichtiefdruckplatte aus Messing wird bevorzugt Nickel verwendet. Bei einer Stichtiefdruckplatte aus Stahl werden bevorzugt Mehrschichtsysteme wie beispielsweise aus Kupfer und Nickel verwendet, um eine abgestufte elektrochemische Potentialdifferenz zwischen der Stichtiefdruckplatte und der abriebvermindernden Schicht zu erzeugen.The adhesion promoting layer particularly preferably consists of nickel, copper or an alloy with nickel and/or copper. In the case of an intaglio printing plate made of brass, nickel is preferably used. In the case of an intaglio printing plate made of steel, multi-layer systems such as, for example, copper and nickel are preferably used in order to generate a graded electrochemical potential difference between the intaglio printing plate and the wear-reducing layer.

Gemäß einer weiteren bevorzugten Ausführungsform besteht die Haftvermittlungsschicht aus einer Zink-Phosphatierung, die eine chemische Aktivierung der Stichtiefdruckplatte oder der Stichtiefdruckzylinder bewirkt.According to a further preferred embodiment, the adhesion-promoting layer consists of a zinc phosphate treatment which brings about a chemical activation of the intaglio printing plate or the intaglio printing cylinder.

Gemäß einer weiteren bevorzugten Ausführungsform weist die Oberfläche einer Stichtiefdruckplatte zu druckenden oder prägenden Vertiefungen auf, wobei die zu druckenden oder prägenden Vertiefungen direkt mittels eines Bearbeitungsmoduls in die Oberfläche einer Stichtiefdruckplatte eingebracht werden, bevor die Haftvermittlungsschicht und die abriebvermindernde Schicht auf die Stichtiefdruckplatte aufgebracht werden. Das Bearbeitungsmodul ist insbesondere ein mechanisches Fräsmodul zur mechanischen Gravur oder ein Lasermodul zur Lasergravur oder ein Ritzmodul zum Ritzen bzw. Drehen. Hierbei ist die Stichtiefdruckplatte besonders bevorzugt bereits vor dem Einbringen der zu druckenden oder prägenden Vertiefungen gebogen oder walzenförmig ausgeführt, so dass sie direkt auf einen Stichtiefdruckzylinder aufgespannt werden kann oder diesen bereits bildet.According to a further preferred embodiment, the surface of an intaglio printing plate has indentations to be printed or embossed, with the indentations to be printed or embossed being introduced directly into the surface of an intaglio printing plate by means of a processing module before the adhesion-promoting layer and the abrasion-reducing layer are applied to the intaglio printing plate. The processing module is in particular a mechanical milling module for mechanical engraving or a laser module for laser engraving or a scoring module for scoring or turning. Here, the intaglio printing plate is particularly preferred already before the introduction of the indentations to be printed or embossed, it is bent or designed in the form of a roller, so that it can be clamped directly onto an intaglio printing cylinder or already forms one.

Die erfindungsgemäße Stichtiefdruckplatte besteht aus Messing, Stahl, Kupfer oder einer Legierung mit Messing und/oder Stahl und/oder Kupfer. Die Stichtiefdruckplatte besteht dabei bevorzugt im Wesentlichen bzw. zum überwiegenden Anteil aus den genannten Materialien, wobei den genannten Materialien weitere Materialien wie z.B. Kohlenstoff im geringen Umfang hinzugefügt werden können, um die mechanischen Eigenschaften der Stichtiefdruckplatte zu beeinflussen bzw. zu verbessern.The intaglio printing plate according to the invention consists of brass, steel, copper or an alloy with brass and/or steel and/or copper. The intaglio printing plate preferably consists essentially or for the most part of the materials mentioned, wherein further materials such as carbon can be added to a small extent to the materials mentioned in order to influence or improve the mechanical properties of the intaglio printing plate.

Besonderer Vorteil der Erfindung ist, dass die verbesserte Haftung der abriebvermindernden Schicht auf der Stichtiefdruckplatte zu einer Erhöhung der Standzeit von mit einer abriebvermindernden Schicht versehenen Stichtiefdruckplatten aus Messing, Stahl oder Kupfer oder einer Legierung mit Messing und/oder Stahl und/oder Kupfer führt.A particular advantage of the invention is that the improved adhesion of the abrasion-reducing layer on the intaglio printing plate leads to an increase in the service life of intaglio printing plates provided with an abrasion-reducing layer made of brass, steel or copper or an alloy with brass and/or steel and/or copper.

Wertdokumente, die mit einer erfindungsgemäßen Stichtiefdruckplatte bedruckt werden können, sind insbesondere Banknoten, Aktien, Anleihen, Urkunden, Gutscheine, Schecks, hochwertige Eintrittskarten, aber auch andere fälschungsgefährdete Papiere, wie Pässe und sonstige Ausweisdokumente, sowie Karten, wie beispielsweise Kredit- oder Debitkarten, deren Kartenkörper mindestens eine Lage eines Sicherheitspapiers aufweist, und auch Produktsicherungselemente, wie Etiketten, Siegel, Verpackungen, Faltschachteln, Beipackzettel und dergleichen. Die vereinfachte Benennung Wertdokument schließt alle oben genannten Materialien, Dokumente und Produktsicherungsmittel ein. Das zu bedruckende Substrat derartiger Wertdokumente besteht besonders bevorzugt aus Papier aus Baumwollfasern, wie es beispielsweise für Banknoten verwendet wird, oder aus anderen natürlichen Fasern oder aus Synthesefasern oder einer Mischung aus natürlichen und synthetischen Fasern, oder aus mindestens einer Kunststofffolie. Weiterhin bevorzugt besteht das Substrat aus einer Kombination aus mindestens zwei übereinander angeordneten und miteinander verbundenen unterschiedlichen Substraten, einem sogenannten Hybrid. Hierbei besteht das Substrat beispielsweise aus einer Kombination Kunststofffolie-Papier-Kunststofffolie, d.h. ein Substrat aus Papier wird auf jeder seiner beiden Seiten durch eine Kunststofffolie bedeckt, oder aus einer Kombination Papier-Kunststofffolie-Papier, d.h. ein Substrat aus einer Kunststofffolie wird auf jeder seiner beiden Seiten durch Papier bedeckt.Documents of value that can be printed with an intaglio printing plate according to the invention are, in particular, banknotes, stocks, bonds, certificates, vouchers, checks, high-quality admission tickets, but also other papers at risk of forgery, such as passports and other identification documents, and cards, such as credit or debit cards, whose card body has at least one layer of security paper, and also product security elements such as labels, seals, packaging, folding boxes, package inserts and the like. The simplified term document of value includes all of the above materials, documents and product security means. The substrate to be printed in such documents of value particularly preferably consists of paper made from cotton fibers, as is the case, for example used for banknotes, or of other natural fibers, or of synthetic fibers, or of a mixture of natural and synthetic fibers, or of at least one plastic film. Furthermore, the substrate preferably consists of a combination of at least two different substrates arranged one above the other and connected to one another, a so-called hybrid. Here, the substrate consists, for example, of a combination of plastic film-paper-plastic film, ie a substrate made of paper is covered on each of its two sides by a plastic film, or of a combination of paper-plastic film-paper, ie a substrate made of a plastic film is covered on each of its covered with paper on both sides.

Es versteht sich, dass die vorstehend genannten und die nachfolgend noch zu erläuternden Merkmale nicht nur in den angegebenen Kombinationen, sondern auch in anderen Kombinationen einsetzbar sind, ohne den Rahmen der vorliegenden Erfindung zu verlassen, soweit dies von dem Schutzumfang der Ansprüche erfasst ist.It goes without saying that the features mentioned above and those yet to be explained below can be used not only in the specified combinations but also in other combinations without departing from the scope of the present invention, insofar as this is covered by the scope of protection of the claims.

Anhand des nachfolgenden Ausführungsbeispiels und der ergänzenden Figuren werden die Vorteile der Erfindung erläutert. Das Ausführungsbeispiel stellt eine bevorzugte Ausführungsform dar, auf die jedoch die Erfindung in keinerlei Weise beschränkt sein soll. Des Weiteren sind die Darstellungen in den Figuren des besseren Verständnisses wegen stark schematisiert und spiegeln nicht die realen Gegebenheiten wider. Insbesondere entsprechen die in den Figuren gezeigten Proportionen nicht den in der Realität vorliegenden Verhältnissen und dienen ausschließlich zur Verbesserung der Anschaulichkeit. Des Weiteren ist die in dem folgenden Ausführungsbeispiel beschriebene Ausführungsform der besseren Verständlichkeit wegen auf die wesentlichen Kerninformationen reduziert. Bei der praktischen Umsetzung können wesentlich komplexere Ausführungsformen zur Anwendung kommen.The advantages of the invention are explained on the basis of the following exemplary embodiment and the supplementary figures. The exemplary embodiment represents a preferred embodiment to which, however, the invention is not intended to be limited in any way. Furthermore, the illustrations in the figures are highly schematic for better understanding and do not reflect the real situation. In particular, the proportions shown in the figures do not correspond to the conditions present in reality and are used solely to improve clarity. Furthermore, the embodiment described in the following exemplary embodiment is reduced to the essential core information for the sake of better comprehensibility. In practical implementation much more complex embodiments can be used.

Im Einzelnen zeigen schematisch:

Fig. 1
eine erfindungsgemäße Stichtiefdruckplatte in Seitenansicht,
Fig. 2
einen vergrößerten Ausschnitt aus Fig. 1.
In detail show schematically:
1
a side view of an intaglio printing plate according to the invention,
2
an enlarged section 1 .

Fig. 1 und 2 zeigen schematisch eine Stichtiefdruckplatte 1, die aus Messing, Stahl, Kupfer oder einer Legierung mit Messing und/oder Stahl und/oder Kupfer besteht und auf deren Oberfläche, die einem zu bedruckenden Substrat zugewandt ist, eine abriebvermindernde Schicht 2 auch Chrom angeordnet ist. Zwischen der Oberfläche der Stichtiefdruckplatte 1 und der abriebvermindernden Schicht 2 ist eine Haftvermittlungsschicht 3 aus Nickel, Kupfer oder einer Legierung mit Nickel und/oder Kupfer oder aus einer Zink-Phosphatierung ein- bzw. aufgebracht. Die Dicke der Haftvermittlungsschicht beträgt 0,05 µm bis 5 µm. Figures 1 and 2 show schematically an intaglio printing plate 1, which consists of brass, steel, copper or an alloy with brass and/or steel and/or copper and on whose surface, which faces a substrate to be printed, an abrasion-reducing layer 2, also chromium, is arranged. Between the surface of the intaglio printing plate 1 and the abrasion-reducing layer 2 there is an adhesion-promoting layer 3 made of nickel, copper or an alloy with nickel and/or copper or made of a zinc phosphate coating. The thickness of the adhesion-promoting layer is 0.05 μm to 5 μm.

Claims (12)

Stichtiefdruckplatte, die aus Messing, Stahl, Kupfer oder einer Legierung mit Messing und/oder Stahl und/oder Kupfer besteht und auf deren Oberfläche, die einem zu bedruckenden Substrat zugewandt ist, eine abriebvermindernde Schicht angeordnet ist, dadurch gekennzeichnet, dass zwischen der Oberfläche der Stichtiefdruckplatte und der abriebvermindernden Schicht eine Haftvermittlungsschicht angeordnet ist.Intaglio printing plate, which consists of brass, steel, copper or an alloy with brass and/or steel and/or copper and on whose surface facing a substrate to be printed an abrasion-reducing layer is arranged, characterized in that between the surface of the Intaglio printing plate and the abrasion-reducing layer, an adhesion-promoting layer is arranged. Stichtiefdruckplatte nach Anspruch 1, dadurch gekennzeichnet, dass die Dicke die Haftvermittlungsschicht 0,05 µm bis 5 µm beträgt.Intaglio printing plate according to Claim 1, characterized in that the thickness of the adhesion-promoting layer is 0.05 µm to 5 µm. Stichtiefdruckplatte nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Stichtiefdruckplatte, die abriebvermindernde Schicht und die Haftvermittlungsschicht unterschiedliche Metalle aufweisen, wobei die Stichtiefdruckplatte ein elektrochemisch edleres Metall aufweist als das Metall der abriebvermindernden Schicht und die Haftvermittlungsschicht ein Metall aufweist, dessen elektrochemisches Potential zwischen dem elektrochemischen Potential des Metalls der Stichtiefdruckplatte und dem elektrochemischen Potential des Metalls der abriebvermindernde Schicht liegt.Intaglio printing plate according to Claim 1 or 2, characterized in that the intaglio printing plate, the abrasion-reducing layer and the adhesion-promoting layer have different metals, the intaglio printing plate having an electrochemically nobler metal than the metal of the abrasion-reducing layer and the adhesion-promoting layer having a metal whose electrochemical potential is between the electrochemical potential of the metal of the intaglio printing plate and the electrochemical potential of the metal of the abrasion-reducing layer. Stichtiefdruckplatte nach einem der vorigen Ansprüche, dadurch gekennzeichnet, dass die abriebvermindernde Schicht aus Chrom besteht.Intaglio printing plate according to one of the preceding claims, characterized in that the abrasion-reducing layer consists of chromium. Stichtiefdruckplatte nach einem der vorigen Ans 2, dadurch gekennzeichnet, dass die Haftvermittlungsschicht aus Nickel, Kupfer oder einer Legierung mit Nickel und/oder Kupfer oder aus einer Zink-Phosphatierung besteht.Intaglio printing plate according to one of the preceding Ans 2, characterized in that the adhesion-promoting layer consists of nickel, copper or an alloy with nickel and/or copper or of a zinc phosphating. Verfahren zur Herstellung einer Stichtiefdruckplatte, die aus Messing, Stahl, Kupfer oder einer Legierung mit Messing und/oder Stahl und/oder Kupfer besteht, dadurch gekennzeichnet, dass eine Stichtiefdruckplatte bereitgestellt wird, die aus Messing, Stahl, Kupfer oder einer Legierung mit Messing und/oder Stahl und/oder Kupfer besteht, auf die Oberfläche der Stichtiefdruckplatte, die einem zu bedruckenden Substrat zugewandt ist, eine Haftvermittlungsschicht aufgebracht wird und anschließend auf die Haftvermittlungsschicht eine abriebvermindernde Schicht aufgebracht wird.Method for the production of an intaglio printing plate made of brass, steel, copper or an alloy with brass and/or steel and/or copper, characterized in that an intaglio printing plate is provided made of brass, steel, copper or an alloy with brass and /or steel and/or copper, an adhesion-promoting layer is applied to the surface of the intaglio printing plate that faces a substrate to be printed, and then an abrasion-reducing layer is applied to the adhesion-promoting layer. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass die Dicke die Haftvermittlungsschicht 0,05 µm bis 5 µm beträgt.Method according to Claim 6, characterized in that the thickness of the adhesion-promoting layer is 0.05 µm to 5 µm. Verfahren nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass die Stichtiefdruckplatte, die abriebvermindernde Schicht und die Haftvermittlungsschicht unterschiedliche Metalle aufweisen, wobei die Stichtiefdruckplatte ein elektrochemisch edleres Metall aufweist als das Metall der abriebvermindernden Schicht und die Haftvermittlungsschicht ein Metall aufweist, dessen elektrochemisches Potential zwischen dem elektrochemischen Potential des Metalls der Stichtiefdruckplatte und dem elektrochemischen Potential des Metalls der abriebvermindernde Schicht liegt.Method according to Claim 6 or 7, characterized in that the intaglio printing plate, the abrasion-reducing layer and the adhesion-promoting layer have different metals, the intaglio printing plate having an electrochemically nobler metal than the metal of the abrasion-reducing layer and the adhesion-promoting layer having a metal whose electrochemical potential is between the electrochemical potential of the metal of the intaglio printing plate and the electrochemical potential of the metal of the abrasion-reducing layer. Verfahren nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, dass die Haftvermittlerschicht chemisch, galvanisch, mit einem PVD-Verfahren oder mit einem Tauch- oder Sprühverfahren auf die Stichtiefdruckplatte aufgebracht wird.Method according to one of Claims 6 to 8, characterized in that the adhesion-promoting layer is applied to the intaglio printing plate chemically, galvanically, using a PVD method or using a dipping or spraying method. Verfahren nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, dass die abriebvermindernde Schicht galvanisch oder mit einem PVD-Verfahren auf die Haftvermittlerschicht aufgebracht wird.Method according to one of Claims 6 to 9, characterized in that the abrasion-reducing layer is applied to the adhesion-promoting layer galvanically or using a PVD method. Verfahren nach einem der Ansprüche 6 bis 10, dadurch gekennzeichnet, dass die abriebvermindernde Schicht aus Chrom besteht.Method according to one of Claims 6 to 10, characterized in that the wear-reducing layer consists of chromium. Verfahren nach einem der Ansprüche 6 bis 11, dadurch gekennzeichnet, dass die Haftvermittlungsschicht aus Nickel, Kupfer oder einer Legierung mit Nickel und/oder Kupfer oder aus einer Zink-Phosphatierung besteht.Method according to one of Claims 6 to 11, characterized in that the adhesion-promoting layer consists of nickel, copper or an alloy with nickel and/or copper or of zinc phosphating.
EP22020244.4A 2021-06-02 2022-05-30 Intaglio printing plate with extended service life and method for the production of same Pending EP4098769A3 (en)

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EP1578604A2 (en) 2002-12-20 2005-09-28 Giesecke & Devrient GmbH Method and device for producing intaglio printing plates and a printing plate produced in such a manner
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