EP3418066B1 - Method for the production of an embossing tool for tactile structures - Google Patents

Method for the production of an embossing tool for tactile structures Download PDF

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Publication number
EP3418066B1
EP3418066B1 EP18000539.9A EP18000539A EP3418066B1 EP 3418066 B1 EP3418066 B1 EP 3418066B1 EP 18000539 A EP18000539 A EP 18000539A EP 3418066 B1 EP3418066 B1 EP 3418066B1
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EP
European Patent Office
Prior art keywords
embossing tool
embossing
printing plate
structures
embossed
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.)
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Application number
EP18000539.9A
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German (de)
French (fr)
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EP3418066A1 (en
Inventor
Christian Schulze
Peter Franz
Hans-Joachim Kliem
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
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Giesecke and Devrient Currency Technology GmbH
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Publication of EP3418066A1 publication Critical patent/EP3418066A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/324—Reliefs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/425—Marking by deformation, e.g. embossing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44B—MACHINES, APPARATUS OR TOOLS FOR ARTISTIC WORK, e.g. FOR SCULPTURING, GUILLOCHING, CARVING, BRANDING, INLAYING
    • B44B5/00—Machines or apparatus for embossing decorations or marks, e.g. embossing coins
    • B44B5/02—Dies; Accessories
    • B44B5/026—Dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/22—Removing surface-material, e.g. by engraving, by etching

Definitions

  • the invention relates to a method for producing an embossing tool, in particular a high-pressure plate for blind embossing, structures which can be tactilely detected being embossed into a substrate using the embossing tool.
  • Embossing forms are used for rotogravure or letterpress printing.
  • a special application is the use of structures that can be clearly recognized by people with visual impairments.
  • a special design is the Braille or markings, which are defined by points or line structures typical of the country based on the system or quantity, and represent, for example, a denomination of a banknote.
  • intaglio printing a special form of gravure printing, a printing plate with recessed structures is used, which transfers raised areas to the substrate to be embossed with high pressure.
  • An embossing tool for producing a security element for a valuable object from a substrate, in particular a bank note, a label or an outer packaging, is known, with an engraving for producing a tactile in the surface of the embossing tool detectable structure is introduced.
  • the tactilely detectable structure here consists of a first stamping structure and a second stamping structure, the second stamping structure being arranged within the first stamping structure.
  • the first stamping structure forms a base for the second stamping structure on which the second stamping structure is arranged.
  • the overall result is an embossed structure which consists of a base which is formed by the first embossed structure, the base surrounding the second embossed structure, which in turn is arranged on the base.
  • embossing plates At high pressure, milled, lasered, washed or etched embossing plates are used, which create a raised structure on the substrate by means of a counter-pressure form using mechanical pressure.
  • the mechanical pressure for embossing is exerted directly locally on the printing plate, this pressure being transmitted to the printing unit and the corresponding bearings of printing and counter-pressure cylinders and, if appropriate, further cylinders, and this places a heavy load on them. This has an unfavorable effect on the service life and maintenance frequency of a printing and / or embossing machine, particularly in the case of selective embossing structures.
  • the invention is therefore based on the object of developing a generic embossing tool in such a way that the disadvantages of the prior art are eliminated.
  • the selective application of pressure should be transferred to a larger area in order to manage with a lower mechanical pressure load for the various cylinders of a printing press or their bearings.
  • the embossing tool is produced using the method defined in claim 1.
  • the recess on the back of the embossing tool particularly advantageously distributes the selective pressure distribution, which acts on the elevation on the front of the embossing tool, over a larger area on the back of the embossing tool and thus relieves other components arranged on the back of the embossing tool, onto which the embossing tool relies is spanned.
  • the embossing tool is a high-pressure plate for blind embossing, in which the surface of the printing plate is not provided with color.
  • the elevations of the high-pressure plate are transferred into the substrate to be embossed, without transferring color to the substrate.
  • the embossing tool consists of a metal, in particular nickel, copper or zinc, which is deposited on the intaglio printing plate by means of a galvanic deposition process and thus forms the structures of the intaglio printing plate in an inverted manner.
  • the stamping tool in particular that made of nickel, copper or zinc, has a thickness of approximately 200 ⁇ m to about 750 ⁇ m. Other configurations also go well beyond these material thicknesses. Thicknesses of, for example, 10 mm may also be desired.
  • the length and width of the embossing tool is particularly advantageously about 900 mm to about 1100 mm.
  • the depressions of individual elements on the back of the embossing tool have a depth of up to 0.5 mm, preferably about 0.1 mm, a diameter or a width of up to 1.6 mm, preferably 0.1 mm to 0.2 mm, and a distance from one another (edge to edge) of up to 4 cm, preferably 0.1 mm to 0.5 mm.
  • the embossing tool is preferably clamped onto a steel cylinder as a carrier cylinder, a PVC film with a thickness of approximately 0.5 mm preferably being inserted between the embossing tool and the steel cylinder.
  • machines can be used with this embossing tool that are suitable for holding, screwing, riveting, suctioning, clamping, holding magnetically or using tools to adhere to the steel cylinder.
  • These can be embossing devices, punching machines, folding machines, offset machines, high-pressure machines, coating machines with offset plants or coating units, as well as digital printing machines or screen printing machines, which basically enable embossing.
  • machines can be used which are designed flat / flat, round / flat or flat / round in the embossed version.
  • the geometries of the embossed structures ie in particular the depth, width and length as well as the flank angle, the distance from one another and the distribution of the individual embossed structures on the embossing tool, adapted to the conditions of the embossing design and the substrate to be embossed, as is the case, for example, with the DE 102015009983 A1 is known.
  • the intaglio printing plate is made of brass or plastic and the milling structures or recesses are produced in the brass or plastic plate using a mechanical milling head, a stylus or a laser.
  • gravure printing plates can also be used which otherwise allow recesses, for example by washing out, etching.
  • the embossing structures can be created, which can be matched in particular to the substrate to be embossed.
  • the high pressure mold can also be used in machines that are not actually intended for an embossing process.
  • the embossed structures can also be implemented in a particularly fine manner and inexpensive long runs can be produced with the same printed image.
  • the stamping tools are particularly durable for long runs.
  • due to the galvanic molding process the cheap duplication of the embossing tools is given with very high repeatability.
  • the substrate into which the embossed structures are molded in the embossing process is particularly preferably made of paper made from cotton fibers, such as is used for banknotes or as a fitting material, or from other natural fibers or from synthetic fibers or a mixture of natural and synthetic fibers, or from at least one plastic film.
  • the substrate preferably consists of a combination of at least two different substrates arranged above one another and connected to one another, a so-called hybrid.
  • the substrate consists, for example, of a combination of plastic film-paper-plastic film, that is, a substrate made of paper is covered on both sides by a plastic film, or of a combination of paper-plastic film-paper, that is, a substrate made of plastic film is on each of its both sides covered by paper.
  • substrates which are particularly suitable for embossing, for example metal foils, thin foils, cardboard, surface-treated cardboard, laminated substrate.
  • the paper layer usually has a weight of 40 g / m 2 to 110 g / m 2 , preferably from 80 g / m 2 to 90 g / m 2 . Of course, depending on the application, any other suitable weight and strength can be used.
  • the thickness of the substrate is preferably about 90 ⁇ m or more.
  • Valuable documents for which such a substrate or security paper can be used are, in particular, banknotes, shares, bonds, certificates, vouchers, checks, high-quality admission tickets, but also other papers that are at risk of forgery, such as passports and other identification documents, as well as cards such as credit cards. or debit cards, the card body of which has at least one layer of security paper, and also product security elements, such as labels, seals, blisters, packaging, folding boxes, package inserts and the like.
  • the simplified naming Value document includes all of the above materials, documents and product assurance elements.
  • front side or back side of an embossing tool are relative terms which can also be referred to as “the embossing” and “the opposite” side and which form the major part of the total surface of the embossing tool.
  • the terms of the side surfaces of an embossing tool are expressly not included in these terms, which are negligibly small compared to the extent of the embossing tool and cannot or cannot be provided with embossing elements or coatings.
  • the Fig. 1 shows a side view of a gravure embossing plate 1 known from the prior art with a recess 3 (left figure) and a high pressure embossing plate 2 known from the prior art with an elevation 4 (right figure).
  • a milled, lasered, washed or etched embossing plate 2 is used, which transfers the raised structure 4 to a substrate (not shown) by means of a counter pressure cylinder (not shown) by means of mechanical pressure, which is located between the high pressure embossing plate 2 and the counter pressure cylinder.
  • the mechanical pressure is directly exerted locally on the printing plate 2, this mechanical pressure being transferred to the printing unit and the corresponding bearings by cylinders. This has an unfavorable effect on the printing press, particularly in the case of selective embossing structures.
  • Fig. 2 shows the side view of the solution according to the invention.
  • a hemispherical depression 7 is milled into a brass plate 5 by means of an appropriate milling geometry (left figure).
  • the subsequent electroplating in the desired plate thickness results in an embossing tool in the form of a high-pressure plate 6 with a corresponding elevation 8 on the front of the plate and a recess 9 on the opposite rear (right illustration).
  • Preferred implementations of the elevation 8 relate to blind signs with a diameter of the elevation 8 in the direction of the plate surface between 1 mm and 2.5 mm.
  • elevations 8 are in particular also introduced into the high-pressure plate 6.
  • the embossed structures in the high-pressure plate 6 are particularly preferably designed to be elongated, such as those from the DE 102015009983 A1 are known.
  • Fig. 3 shows in side view the particular advantage of the invention, according to which the mechanical pressure on the high pressure plate 6 during the printing process (symbolized by the thick arrow) does not take place linearly downwards against the steel cylinder on which the high pressure plate 6 is clamped, but on the Distributed edge of the recess 9 also. This is symbolized by the four smaller arrows on the underside of the high-pressure plate 6. This results in a larger area over which the force is distributed and thus a lower mechanical pressure on the steel cylinder and the impression cylinder and their bearing.
  • the distribution of the mechanical pressure during the embossing process is distributed with small dimensions of the recess 9 (0.1 mm height, 0.1 mm up to 0.2 mm diameter or width and 0.1 to 0.5 mm distance from edge to edge) from the center of the recess 9 to the edge of the recess 9. With larger dimensions (0.5 mm height, 1.6 mm diameter or width and 1 cm distance from edge to edge) this will particularly affect the edge of the outer depressions.

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  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Printing Methods (AREA)
  • Credit Cards Or The Like (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Herstellung eines Prägewerkzeugs, insbesondere einer Hochdruckplatte für Blindprägung, wobei mit dem Prägewerkzeug taktil erfassbare Strukturen in ein Substrat geprägt werden.The invention relates to a method for producing an embossing tool, in particular a high-pressure plate for blind embossing, structures which can be tactilely detected being embossed into a substrate using the embossing tool.

Zur Abwehr von Fälschungsversuchen werden für jegliche Datenträger, die einen Wert darstellen, ständig neue Sicherheitselemente gesucht. Dies gilt ebenso für den Markenschutz. Vorteilhaft sind dabei Elemente, die eine Prägestruktur aufweisen, welche haptisch fühlbar und daher leicht ohne Hilfsmittel zu überprüfen sind.To prevent counterfeiting attempts, new security elements are constantly being sought for any data carriers that represent a value. This also applies to brand protection. Elements that have an embossed structure that can be felt haptically and are therefore easy to check without aids are advantageous.

Dabei kommen Prägeformen für den Tiefdruck oder den Hochdruck zur Anwendung. Eine spezielle Anwendung ist hierbei der Einsatz von Strukturen, die durch Personen mit Sehbehinderung besonders deutlich zu erkennen sind. Eine besondere Ausgestaltung sind hierbei die Brailleschrift oder Kennzeichen, die landestypisch durch Punkte oder Linienstrukturen anhand von der Anlage oder Menge definiert sind, und beispielsweise eine Denomination einer Banknote darstellen.Embossing forms are used for rotogravure or letterpress printing. A special application is the use of structures that can be clearly recognized by people with visual impairments. A special design is the Braille or markings, which are defined by points or line structures typical of the country based on the system or quantity, and represent, for example, a denomination of a banknote.

Im Stichtiefdruck, einer Sonderform des Tiefdrucks, wird dabei eine Druckplatte mit vertieften Strukturen verwendet, die mit hohem Druck erhabene Stellen auf das zu prägende Substrat überträgt.In intaglio printing, a special form of gravure printing, a printing plate with recessed structures is used, which transfers raised areas to the substrate to be embossed with high pressure.

Aus DE 102015009983 A1 ist ein Prägewerkzeug zur Herstellung eines Sicherheitselements für einen Wertgegenstand aus einem Substrat, insbesondere eine Banknote, ein Label oder eine Umverpackung, bekannt, wobei in die Oberfläche des Prägewerkzeugs eine Gravur zur Herstellung einer taktil erfassbaren Struktur eingebracht ist. Die taktil erfassbare Struktur besteht hierbei aus einer ersten Prägestruktur und einer zweiten Prägestruktur, wobei die zweite Prägestruktur innerhalb der ersten Prägestruktur angeordnet ist. Die erste Prägestruktur bildet dabei einen Sockel für die zweite Prägestruktur auf dem die zweite Prägestruktur angeordnet ist. Es ergibt sich insgesamt eine Prägestruktur, die aus einem Sockel besteht, der durch die erste Prägestruktur gebildet wird, wobei der Sockel die zweite Prägestruktur umgibt, die wiederum auf dem Sockel angeordnet ist.Out DE 102015009983 A1 An embossing tool for producing a security element for a valuable object from a substrate, in particular a bank note, a label or an outer packaging, is known, with an engraving for producing a tactile in the surface of the embossing tool detectable structure is introduced. The tactilely detectable structure here consists of a first stamping structure and a second stamping structure, the second stamping structure being arranged within the first stamping structure. The first stamping structure forms a base for the second stamping structure on which the second stamping structure is arranged. The overall result is an embossed structure which consists of a base which is formed by the first embossed structure, the base surrounding the second embossed structure, which in turn is arranged on the base.

Im Hochdruck werden gefräste, gelaserte, ausgewaschene oder geätzte Prägeplatten verwendet, welche durch eine Gegendruckform mittels mechanischem Druck eine erhabene Struktur auf dem Substrat erzeugt. Der mechanische Druck zum Prägen wird dabei direkt lokal auf die Druckplatte ausgeübt, wobei dieser Druck auf das Druckwerk und die entsprechenden Lager von Druck- und Gegendruckzylindern sowie gegebenenfalls weiteren Zylindern übertragen wird und diese stark belastet. Dies wirkt sich besonders bei punktuellen Prägestrukturen ungünstig auf die Lebensdauer und die Wartungshäufigkeit einer Druck- und/oder Prägemaschine aus.At high pressure, milled, lasered, washed or etched embossing plates are used, which create a raised structure on the substrate by means of a counter-pressure form using mechanical pressure. The mechanical pressure for embossing is exerted directly locally on the printing plate, this pressure being transmitted to the printing unit and the corresponding bearings of printing and counter-pressure cylinders and, if appropriate, further cylinders, and this places a heavy load on them. This has an unfavorable effect on the service life and maintenance frequency of a printing and / or embossing machine, particularly in the case of selective embossing structures.

Aus Dokument WO 2009/083148 A2 ist ein Verfahren zur Herstellung eines Prägewerkzeugs bekannt, wobei mit dem Prägewerkzeug taktil erfassbare Strukturen in ein Substrat geprägt werden, und wobei das Prägewerkzeug ausgehend von einer Masterfolie über einen galvanischen Abformweg erzeugt wird.From document WO 2009/083148 A2 A method for producing an embossing tool is known, structures which can be tactilely detected are embossed into a substrate using the embossing tool, and the embossing tool is produced from a master film via a galvanic impression path.

Der Erfindung liegt deshalb die Aufgabe zugrunde, ein gattungsgemäßes Prägewerkzeug derart weiterzubilden, dass die Nachteile des Standes der Technik behoben werden. Insbesondere soll die punktuelle Druckausübung auf eine größere Fläche übertragen werden, um mit einer geringeren mechanischen Druckbelastung für die verschiedenen Zylinder einer Druckmaschine bzw. deren Lager auszukommen.The invention is therefore based on the object of developing a generic embossing tool in such a way that the disadvantages of the prior art are eliminated. In particular, the selective application of pressure should be transferred to a larger area in order to manage with a lower mechanical pressure load for the various cylinders of a printing press or their bearings.

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

Erfindungsgemäß wird das Prägewerkzeug mit dem in Anspruch 1 definierten Verfahren erzeugt.According to the invention, the embossing tool is produced using the method defined in claim 1.

Die Vertiefung auf der Rückseite des Prägewerkzeugs verteilt besonders vorteilhaft die punktuelle Druckverteilung, die auf die Erhöhung auf der Vorderseite des Prägewerkzeug einwirkt, auf eine größere Fläche auf der Rückseite des Prägewerkzeugs und entlastet somit auf der Rückseite des Prägewerkzeugs angeordnete weitere Bauteile, auf die das Prägewerkzeug aufgespannt ist.The recess on the back of the embossing tool particularly advantageously distributes the selective pressure distribution, which acts on the elevation on the front of the embossing tool, over a larger area on the back of the embossing tool and thus relieves other components arranged on the back of the embossing tool, onto which the embossing tool relies is spanned.

Gemäß einer besonders vorteilhaften Ausgestaltung ist das Prägewerkzeug eine Hochdruckplatte für eine Blindprägung, bei der die Oberfläche der Druckplatte nicht mit Farbe versehen ist. Hierbei werden lediglich die Erhöhungen der Hochdruckplatte in das zu verprägende Substrat übertragen, ohne Farbe auf das Substrat zu übertragen.According to a particularly advantageous embodiment, the embossing tool is a high-pressure plate for blind embossing, in which the surface of the printing plate is not provided with color. Here, only the elevations of the high-pressure plate are transferred into the substrate to be embossed, without transferring color to the substrate.

Gemäß einer vorteilhaften Ausgestaltung besteht das Prägewerkzeug aus einem Metall, insbesondere aus Nickel, Kupfer oder Zink, das mit einem galvanischen Abscheideprozess auf der Tiefdruckplatte abgeschieden wird und somit die Strukturen der Tiefdruckplatte invertiert abformt.According to an advantageous embodiment, the embossing tool consists of a metal, in particular nickel, copper or zinc, which is deposited on the intaglio printing plate by means of a galvanic deposition process and thus forms the structures of the intaglio printing plate in an inverted manner.

Gemäß einer besonders vorteilhaften Ausgestaltung weist das Prägewerkzeug, insbesondere das aus Nickel, Kupfer oder Zink, eine Dicke von etwa 200 µm bis etwa 750 µm auf. Weitere Ausgestaltungen gehen auch deutlich über diese Materialstärken hinaus. Hierbei können auch Stärken von beispielsweise 10 mm gewünscht sein. Die Länge und Breite des Prägewerkzeugs beträgt besonders vorteilhaft jeweils etwa 900 mm bis etwa 1100 mm.According to a particularly advantageous embodiment, the stamping tool, in particular that made of nickel, copper or zinc, has a thickness of approximately 200 µm to about 750 µm. Other configurations also go well beyond these material thicknesses. Thicknesses of, for example, 10 mm may also be desired. The length and width of the embossing tool is particularly advantageously about 900 mm to about 1100 mm.

Gemäß einer vorteilhaften Ausgestaltung weisen die Vertiefungen von Einzelelementen auf der Rückseite des Prägewerkzeugs eine Tiefe von bis zu 0,5 mm, bevorzugt etwa 0,1 mm, einen Durchmesser bzw. eine Breite von bis zu 1,6 mm, bevorzugt 0,1 mm bis 0,2 mm, und einen Abstand voneinander (Rand zu Rand) von bis zu 4 cm, bevorzugt 0,1 mm bis 0,5 mm, auf.According to an advantageous embodiment, the depressions of individual elements on the back of the embossing tool have a depth of up to 0.5 mm, preferably about 0.1 mm, a diameter or a width of up to 1.6 mm, preferably 0.1 mm to 0.2 mm, and a distance from one another (edge to edge) of up to 4 cm, preferably 0.1 mm to 0.5 mm.

Das Prägewerkzeug wird bevorzugt auf einen Stahlzylinder als Trägerzylinder aufgespannt, wobei bevorzugt zwischen Prägewerkzeug und Stahlzylinder eine PVC-Folie mit einer Dicke von etwa 0,5 mm eingefügt wird.The embossing tool is preferably clamped onto a steel cylinder as a carrier cylinder, a PVC film with a thickness of approximately 0.5 mm preferably being inserted between the embossing tool and the steel cylinder.

Insbesondere können mit diesem Prägewerkzeug Maschinen zum Einsatz kommen, die geeignet sind, diese zu halten, anzuschrauben, anzunieten, anzusaugen, aufzuspannen, magnetisch zu halten oder mit Hilfsmitteln zur Haftung auf dem Stahlzylinder zu bringen. Das können Prägevorrichtungen, Stanzmaschinen, Falzmaschinen, Offsetmaschinen, Hochdruckmaschinen, Lackmaschinen mit Offsetwerken oder Lackwerken sowie digitale Druckmaschinen oder Siebdruckmaschinen sein, die grundsätzlich eine Prägung ermöglichen. Des Weiteren können Maschinen zum Einsatz kommen, welche flach/ flach, rund/ flach oder flach/ rund in der Prägeausführung ausgestaltet sind.In particular, machines can be used with this embossing tool that are suitable for holding, screwing, riveting, suctioning, clamping, holding magnetically or using tools to adhere to the steel cylinder. These can be embossing devices, punching machines, folding machines, offset machines, high-pressure machines, coating machines with offset plants or coating units, as well as digital printing machines or screen printing machines, which basically enable embossing. Furthermore, machines can be used which are designed flat / flat, round / flat or flat / round in the embossed version.

Gemäß einer vorteilhaften Ausgestaltung werden die Geometrien der Prägestrukturen, d.h. insbesondere die Tiefe, Breite und Länge sowie der Flankenwinkel, der Abstand voneinander und die Verteilung der einzelnen Prägestrukturen auf dem Prägewerkzeug, auf die Bedingungen der Prägeausführung und des zu verprägenden Substrats angepasst, wie es beispielsweise aus der DE 102015009983 A1 bekannt ist.According to an advantageous embodiment, the geometries of the embossed structures, ie in particular the depth, width and length as well as the flank angle, the distance from one another and the distribution of the individual embossed structures on the embossing tool, adapted to the conditions of the embossing design and the substrate to be embossed, as is the case, for example, with the DE 102015009983 A1 is known.

Gemäß einer vorteilhaften Ausgestaltung besteht die Tiefdruckplatte aus Messing oder Kunststoff und erfolgt die Erzeugung der Frässtrukturen bzw. Vertiefungen in die Messing- oder Kunststoffplatte mit einem mechanischen Fräskopf, einem Stichel oder einem Laser.According to an advantageous embodiment, the intaglio printing plate is made of brass or plastic and the milling structures or recesses are produced in the brass or plastic plate using a mechanical milling head, a stylus or a laser.

Des Weiteren können auch Tiefdruckplatten verwendet werden welche anderweitig Vertiefungen erlauben, beispielsweise durch Auswaschen, Ätzen.In addition, gravure printing plates can also be used which otherwise allow recesses, for example by washing out, etching.

Weitere Vorteile der Erfindung sind, dass mannigfaltige Geometrien der Prägestrukturen geschaffen werden können, die im besonderen Maße auf das zu prägende Substrat abgestimmt werden können. Des Weiterem kann die Hochdruckform auch in Maschinen eingesetzt werden, die eigentlich nicht für einen Prägevorgang gedacht sind. Auch können die Prägestrukturen besonders fein umgesetzt werden und dabei kostengünstig hohe Auflagen mit gleichem Druckbild gefertigt werden. Zusätzlich besteht für hohe Auflagen eine besonders hohe Beständigkeit der Prägewerkzeuge. Ebenso ist aufgrund des galvanischen Abformvorgangs die günstige Vervielfältigung der Prägewerkzeuge mit sehr hoher Wiederholgenauigkeit gegeben.Further advantages of the invention are that diverse geometries of the embossing structures can be created, which can be matched in particular to the substrate to be embossed. Furthermore, the high pressure mold can also be used in machines that are not actually intended for an embossing process. The embossed structures can also be implemented in a particularly fine manner and inexpensive long runs can be produced with the same printed image. In addition, the stamping tools are particularly durable for long runs. Likewise, due to the galvanic molding process, the cheap duplication of the embossing tools is given with very high repeatability.

Weitere Oberflächenbehandlungen können dabei die Beständigkeit des Prägewerkzeugs erhöhen, beispielsweise Verchromen.Further surface treatments can increase the durability of the embossing tool, for example chrome plating.

Das Substrat, in das die Prägestrukturen im Prägevorgang abgeformt werden, besteht besonders bevorzugt aus Papier aus Baumwollfasern, wie es beispielsweise für Banknoten oder als Passvorsatzmaterial 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.The substrate into which the embossed structures are molded in the embossing process is particularly preferably made of paper made from cotton fibers, such as is used for banknotes or as a fitting material, or from other natural fibers or from synthetic fibers or a mixture of natural and synthetic fibers, or from at least one plastic film. Furthermore, the substrate preferably consists of a combination of at least two different substrates arranged above one another and connected to one another, a so-called hybrid. Here, the substrate consists, for example, of a combination of plastic film-paper-plastic film, that is, a substrate made of paper is covered on both sides by a plastic film, or of a combination of paper-plastic film-paper, that is, a substrate made of plastic film is on each of its both sides covered by paper.

Weitere Substrate können dabei zum Einsatz kommen, welche sich im besonderen Maße zum Prägen eignen, beispielsweise Metallfolien, Dünnfolien, Karton, oberflächenbehandelter Karton, kaschiertes Substrat.Further substrates can be used which are particularly suitable for embossing, for example metal foils, thin foils, cardboard, surface-treated cardboard, laminated substrate.

Die Papierschicht weist üblicherweise ein Gewicht von 40 g/m2 bis 110 g/m2 auf, vorzugsweise von 80 g/m2 bis 90 g/m2. Selbstverständlich kann je nach Anwendung jedes andere geeignete Gewicht und jede andere geeignete Stärke eingesetzt werden. Die Dicke des Substrats beträgt bevorzugt etwa 90 µm oder mehr.The paper layer usually has a weight of 40 g / m 2 to 110 g / m 2 , preferably from 80 g / m 2 to 90 g / m 2 . Of course, depending on the application, any other suitable weight and strength can be used. The thickness of the substrate is preferably about 90 μm or more.

Wertdokumente, für die ein derartiges Substrat bzw. Sicherheitspapier verwendet werden kann, 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, Blister, Verpackungen, Faltschachteln, Beipackzettel und dergleichen. Die vereinfachte Benennung Wertdokument schließt alle oben genannten Materialien, Dokumente und Produktsicherungselemente ein.Valuable documents for which such a substrate or security paper can be used are, in particular, banknotes, shares, bonds, certificates, vouchers, checks, high-quality admission tickets, but also other papers that are at risk of forgery, such as passports and other identification documents, as well as cards such as credit cards. or debit cards, the card body of which has at least one layer of security paper, and also product security elements, such as labels, seals, blisters, packaging, folding boxes, package inserts and the like. The simplified naming Value document includes all of the above materials, documents and product assurance elements.

Die Begriffe "Vorderseite" oder "Rückseite" eines Prägewerkzeugs sind relative Begriffe, die auch als "die prägende" und "die gegenüberliegende" Seite bezeichnet werden können und die den überwiegenden Anteil der Gesamtoberfläche des Prägewerkzeugs bilden. Ausdrücklich nicht umfasst mit diesen Begriffen sind die Seitenflächen eines Prägewerkzeugs, die im Vergleich zu der Ausdehnung des Prägewerkzeugs verschwindend gering sind und nicht mit Prägeelementen oder Beschichtungen versehen werden bzw. werden können.The terms "front side" or "back side" of an embossing tool are relative terms which can also be referred to as "the embossing" and "the opposite" side and which form the major part of the total surface of the embossing tool. The terms of the side surfaces of an embossing tool are expressly not included in these terms, which are negligibly small compared to the extent of the embossing tool and cannot or cannot be provided with embossing elements or coatings.

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 der nachfolgenden Ausführungsbeispiele und der ergänzenden Figuren werden die Vorteile der Erfindung erläutert. Die Ausführungsbeispiele stellen bevorzugte Ausführungsformen 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 sind die in den folgenden Ausführungsbeispielen beschriebenen Ausführungsformen der besseren Verständlichkeit wegen auf die wesentlichen Kerninformationen reduziert. Bei der praktischen Umsetzung können wesentlich komplexere Muster oder Bilder zur Anwendung kommen.The advantages of the invention are explained on the basis of the following exemplary embodiments and the additional figures. The exemplary embodiments represent preferred embodiments, to which, however, the invention is not to be restricted in any way. Furthermore, the representations in the figures are highly schematic for better understanding and do not reflect the real circumstances. In particular, the proportions shown in the figures do not correspond to the conditions that exist in reality and only serve to improve clarity. Furthermore, the embodiments described in the following exemplary embodiments are reduced to the essential core information for better understanding. In the practical implementation much more complex patterns or images can be used.

Im Einzelnen zeigen schematisch:

Fig. 1
in Seitenansicht eine aus dem Stand der Technik bekannte Tiefdruckprägeform (linke Abbildung) und eine aus dem Stand der Technik bekannte Hochdruckprägeform (rechte Abbildung),
Fig. 2
in Seitenansicht eine gefräste Messingplatte (linke Abbildung) und das damit erzeugte erfindungsgemäße Prägewerkzeug (rechte Abbildung),
Fig. 3
in Seitenansicht die Verteilung des mechanischen Drucks bei einem erfindungsgemäßen Prägewerkzeug.
In detail show schematically:
Fig. 1
in side view a gravure embossing die known from the prior art (left figure) and a high pressure embossing die known from the prior art (right illustration),
Fig. 2
in side view a milled brass plate (left figure) and the embossing tool according to the invention produced therewith (right figure),
Fig. 3
in side view the distribution of the mechanical pressure in an embossing tool according to the invention.

Die Fig. 1 zeigt in Seitenansicht eine aus dem Stand der Technik bekannte Tiefdruckprägeplatte 1 mit einer Vertiefung 3 (linke Abbildung) und eine aus dem Stand der Technik bekannte Hochdruckprägeplatte 2 mit einer Erhöhung 4 (rechte Abbildung). Im Hochdruck wird eine gefräste, gelaserte, ausgewaschene oder geätzte Prägeplatte 2 verwendet, welche durch einen Gegendruckzylinder (nicht dargestellt) mittels mechanischen Druck die erhabene Struktur 4 auf ein Substrat (nicht dargestellt) überträgt, das sich zwischen der Hochdruckprägeplatte 2 und dem Gegendruckzylinder befindet. Der mechanische Druck wird dabei direkt lokal auf die Druckplatte 2 ausgeübt, wobei dieser mechanische Druck auf das Druckwerk und die entsprechenden Lager von Zylindern übergeleitet wird. Dies wirkt sich besonders bei punktuellen Prägestrukturen ungünstig auf die Druckmaschine aus.The Fig. 1 shows a side view of a gravure embossing plate 1 known from the prior art with a recess 3 (left figure) and a high pressure embossing plate 2 known from the prior art with an elevation 4 (right figure). In high pressure, a milled, lasered, washed or etched embossing plate 2 is used, which transfers the raised structure 4 to a substrate (not shown) by means of a counter pressure cylinder (not shown) by means of mechanical pressure, which is located between the high pressure embossing plate 2 and the counter pressure cylinder. The mechanical pressure is directly exerted locally on the printing plate 2, this mechanical pressure being transferred to the printing unit and the corresponding bearings by cylinders. This has an unfavorable effect on the printing press, particularly in the case of selective embossing structures.

Fig. 2 zeigt in Seitenansicht die erfindungsgemäße Lösung. Hierbei wird eine halbkugelförmige Vertiefung 7 mittels einer entsprechenden Fräsgeometrie in eine Messingplatte 5 gefräst (linke Abbildung). Die anschließende galvanische Abformung in der gewünschten Plattenstärke ergibt ein Prägewerkzeug in Form einer Hochdruckplatte 6 mit einer entsprechenden Erhöhung 8 auf der Vorderseite der Platte und einer Vertiefung 9 auf der gegenüberliegenden Rückseite (rechte Abbildung). Fig. 2 shows the side view of the solution according to the invention. Here, a hemispherical depression 7 is milled into a brass plate 5 by means of an appropriate milling geometry (left figure). The subsequent electroplating in the desired plate thickness results in an embossing tool in the form of a high-pressure plate 6 with a corresponding elevation 8 on the front of the plate and a recess 9 on the opposite rear (right illustration).

Bevorzugte Umsetzungen der Erhöhung 8 betreffen Blindenkennzeichen mit einem Durchmesser der Erhöhung 8 in Richtung der Plattenoberfläche zwischen 1 mm und 2,5 mm. Dabei werden insbesondere auch mehrere Erhöhung 8 in die Hochdruckplatte 6 eingebracht.Preferred implementations of the elevation 8 relate to blind signs with a diameter of the elevation 8 in the direction of the plate surface between 1 mm and 2.5 mm. Several elevations 8 are in particular also introduced into the high-pressure plate 6.

Besonders bevorzugt sind die Prägestrukturen in der Hochdruckplatte 6 langgezogen ausgestaltet, wie sie beispielsweise aus der DE 102015009983 A1 bekannt sind.The embossed structures in the high-pressure plate 6 are particularly preferably designed to be elongated, such as those from the DE 102015009983 A1 are known.

Fig. 3 zeigt in Seitenansicht den besonderen Vorteil der Erfindung, wonach der mechanische Druck auf der Hochdruckplatte 6 während des Druckprozesses (symbolisiert durch den dicken Pfeil) nicht punktuell linear nach unten gegen den Stahlzylinder, auf den die Hochdruckplatte 6 aufgespannt ist, erfolgt, sondern sich auf den Rand der Vertiefung 9 hinaus verteilt. Dies wird durch die vier kleineren Pfeile an der Unterseite der Hochdruckplatte 6 symbolisiert. Damit ergibt sich eine größere Fläche, auf die sich die Kraft verteilt, und damit ein geringerer mechanischer Druck auf den Stahlzylinder sowie den Gegendruckzylinder und deren Lagerung. Fig. 3 shows in side view the particular advantage of the invention, according to which the mechanical pressure on the high pressure plate 6 during the printing process (symbolized by the thick arrow) does not take place linearly downwards against the steel cylinder on which the high pressure plate 6 is clamped, but on the Distributed edge of the recess 9 also. This is symbolized by the four smaller arrows on the underside of the high-pressure plate 6. This results in a larger area over which the force is distributed and thus a lower mechanical pressure on the steel cylinder and the impression cylinder and their bearing.

Die Verteilung des mechanischen Drucks während des Prägevorgangs verteilt sich bei kleinen Abmessungen der Vertiefung 9 (0,1 mm Höhe, 0,1 mm bis 0,2 mm Durchmesser bzw. Breite und 0,1 bis 0,5 mm Abstand von Rand zu Rand) von der Mitte der Vertiefung 9 zum Rand der Vertiefung 9 hin. Bei größeren Abmessungen (0,5 mm Höhe, 1,6 mm Durchmesser bzw. Breite und 1 cm Abstand von Rand zu Rand) wird dies insbesondere den Rand der äußeren Vertiefungen betreffen.The distribution of the mechanical pressure during the embossing process is distributed with small dimensions of the recess 9 (0.1 mm height, 0.1 mm up to 0.2 mm diameter or width and 0.1 to 0.5 mm distance from edge to edge) from the center of the recess 9 to the edge of the recess 9. With larger dimensions (0.5 mm height, 1.6 mm diameter or width and 1 cm distance from edge to edge) this will particularly affect the edge of the outer depressions.

Claims (9)

  1. Method for producing an embossing tool, wherein tactile structures are embossed into a substrate by the embossing tool, wherein the embossing tool is created from a gravure printing plate (5) by means of electroforming, wherein first an embossing motif is introduced into a gravure printing plate (5) and then the embossing tool (6) is created by electroforming the gravure printing plate (5), wherein the embossing motif on the embossing tool (6) consists of one or more elevations (8) on the front side of the embossing tool (6) and one or more directly opposite depressions (9) on the rear side of the embossing tool (6).
  2. Method according to Claim 1, characterized in that the embossing tool is a relief printing plate.
  3. Method according to at least one of the preceding claims, characterized in that the embossing tool consists of nickel, copper or zinc.
  4. Method according to at least one of the preceding claims, characterized in that the embossing tool has a thickness of approximately 200 µm to approximately 750 µm.
  5. Method according to at least one of the preceding claims, characterized in that the depressions on the rear side of the embossing tool have a height of up to 0.5 mm, preferably approximately 0.1 mm, a diameter or a width of up to 1.6 mm, preferably 0.1 mm to 0.2 mm, and a distance from one another (edge to edge) of up to 4 cm, preferably 0.1 mm to 0.5 mm.
  6. Method according to at least one of the preceding claims, characterized in that the embossing tool is mounted onto a steel cylinder as a carrier cylinder, wherein a film of PVC with a thickness of approximately 0.5 mm is preferably inserted between the embossing tool and the steel cylinder.
  7. Method according to at least one of the preceding claims, characterized in that the geometries of the embossed structures, i.e. in particular the depth, width and length as well as the flank angle, the distance from one another and the distribution, of the individual embossed structures on the embossing tool are adapted to the embossing conditions and to a substrate to be embossed.
  8. Method according to at least one of the preceding claims, characterized in that the gravure printing plate consists of brass or plastic, wherein the milled structures in the brass or plastic plate are created by a mechanical milling head, a graver or a laser.
  9. Method according to at least one of the preceding claims, characterized in that the gravure printing plate is etched or washed-out.
EP18000539.9A 2017-06-21 2018-06-19 Method for the production of an embossing tool for tactile structures Active EP3418066B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017005838.5A DE102017005838A1 (en) 2017-06-21 2017-06-21 Method for producing an embossing tool for tactile detectable structures

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EP3418066A1 EP3418066A1 (en) 2018-12-26
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Publication number Priority date Publication date Assignee Title
DE102017007525A1 (en) 2017-08-10 2019-02-14 Giesecke+Devrient Currency Technology Gmbh Embossing tool for tactile detectable structures
DE102018000686A1 (en) 2018-01-29 2019-08-01 Giesecke+Devrient Currency Technology Gmbh Embossing plate for producing embossed structures in a valuable article and method for producing a stamping plate
DE102018000694A1 (en) 2018-01-29 2019-08-01 Giesecke+Devrient Currency Technology Gmbh Device for fastening an embossing tool on an embossing roller
DE102018000696A1 (en) 2018-01-29 2019-08-01 Giesecke+Devrient Currency Technology Gmbh Method of attaching an embossing tool to an embossing roll
DE102018008225A1 (en) 2018-10-17 2020-04-23 Giesecke+Devrient Currency Technology Gmbh Embossing tool for tactile structures
DE102018010010A1 (en) * 2018-12-28 2020-07-02 Hueck Rheinische Gmbh Pressed sheet
WO2021249609A1 (en) * 2020-06-09 2021-12-16 Giesecke+Devrient Currency Technology Gmbh Retroreflective relief structure in embossing coating

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DE102004050984B3 (en) * 2004-10-20 2006-07-06 Hueck Folien Gmbh & Co. Kg Method of making an endless nickel die for embossing textured surfaces
DE102007062123A1 (en) * 2007-12-21 2009-06-25 Giesecke & Devrient Gmbh Tool mold for creating a microstructure
MX348059B (en) * 2012-04-17 2017-05-25 Boegli-Gravures Sa Method for manufacturing a set of embossing rollers.
DE102015009983A1 (en) 2015-07-31 2017-02-02 Giesecke & Devrient Gmbh Tactile structures on valuables

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