EP3124285B1 - Embossing tool for producing a security element with an optically variable structure - Google Patents

Embossing tool for producing a security element with an optically variable structure Download PDF

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Publication number
EP3124285B1
EP3124285B1 EP16001620.0A EP16001620A EP3124285B1 EP 3124285 B1 EP3124285 B1 EP 3124285B1 EP 16001620 A EP16001620 A EP 16001620A EP 3124285 B1 EP3124285 B1 EP 3124285B1
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EP
European Patent Office
Prior art keywords
embossing
flank
depression
plate
embossing tool
Prior art date
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EP16001620.0A
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German (de)
French (fr)
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EP3124285A1 (en
Inventor
Karlheinz Mayer
Walter DÖRFLER
Thanh-Hao Huynh
Peter Franz
Christoph Mengel
Marco Viticoli
Mario Alessandrini
Luigi Damiano Russo
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Giesecke and Devrient Currency Technology GmbH
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Giesecke and Devrient Currency Technology GmbH
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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
    • B42D25/40—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
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14—Security printing
    • B41M3/148—Transitory images, i.e. images only visible from certain viewing angles

Definitions

  • the invention relates to an embossing tool for producing a security element with an optically variable structure, the optically variable structure showing a tilting effect when the security element is tilted about an axis.
  • the embossing tool here consists of an embossing plate with a surface, the surface of the embossing plate having a multiplicity of channel-shaped depressions arranged essentially parallel to one another. These channel-shaped depressions each consist of a first and a second flank, which lie opposite one another, the first flank of a depression and the second flank of the depression adjacent to this depression converging towards one another in the direction of the surface of the embossing plate. Furthermore, a flat area is arranged between the first flank of a depression and the second flank of the depression adjacent to this depression, which is aligned essentially parallel to the surface of the embossing plate.
  • optically variable security elements To protect against counterfeiting, especially with color copiers or other reproduction methods, data carriers such as banknotes, securities, credit or identification cards, passports, certificates and the like, labels, packaging or other elements for product security are equipped with optically variable security elements.
  • the protection against counterfeiting is based on the fact that the visually and easily and clearly recognizable optically variable effect is not or only insufficiently reproduced by the above-mentioned reproduction devices.
  • the optically variable security elements have a corresponding haptic that is difficult to copy, but easy to check and without tools.
  • Such an optically variable security element which shows a tilting effect when the security element is tilted about an axis
  • a security element with an optically variable structure which has a plurality of first embossed structures.
  • Each of the first embossed structures consists of at least two flanks that converge at least at a certain angle.
  • the WO 2013/045055 A1 also relates to an embossing tool for producing this security element.
  • an embossing plate has depressions with which prism or pyramid-shaped embossing structures are produced.
  • a substrate is placed on the surface of the embossing plate, pressed into the depressions with high mechanical pressure and deformed.
  • the basic embossing line of the embossing plate advantageously has a straight upper edge, which stands up to the lasering and is always "undamaged" constant.
  • a disadvantage of the basic shape of the prismatic or pyramidal embossed structures WO 2013/045055 A1 is, however, that their basic form shows the same tipping effect from all viewing directions.
  • the WO 2013/045055 A1 proposes that in at least one partial area of the optically variable structure at least one flank of the first embossed structures each has at least one additional embossed structure which is placed on the flank of the first embossed structures or inserted into the flank of the first embossed structures.
  • Such an embossing structure requires an increased technical outlay when engraving the corresponding embossing plate.
  • a intaglio printing plate for full-surface printing of contiguous print image areas is known, in which the print image is worked into the surface of the printing plate in the form of an engraving.
  • dividers are provided in the engraved, ink-receiving areas, which divide the engraved areas into partial areas, the dividers being designed in such a way that they have no surfaces at the level of the printing plate surface.
  • the ends of the separating webs pointing outwards can be removed after the recesses forming the fine structure have been engraved. These upper ends of the dividers, which are designed as a plateau, produce fine bright lines in the printed image.
  • a diffraction-optically effective diffraction structure each consisting of a diffraction-optically effective microstructure, the microstructures having approximately 300 to 3000 lines per millimeter or a line width of 300 nm to 3 ⁇ m.
  • a fine structure which is arranged within a macroscopic embossed structure.
  • This fine structure has a depth of 0.1 ⁇ m to 10 ⁇ m and is, for example, a diffraction structure.
  • the macroscopic embossed structure on the other hand, has a depth in a range from 13 ⁇ m to 30 ⁇ m.
  • 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 first flank of each groove-shaped depression has a different angle of inclination with respect to the surface of the embossing plate than the corresponding second, opposite flank.
  • the first flank is preferably steeper than the second flank.
  • the angle of inclination of the first flank is preferably 0 ° to 40 °, particularly preferably 10 ° to 30 ° and very particularly preferably 20 ° to 30 ° with respect to the surface normal of the surface of the embossing plate or the perpendicular to the surface of the embossing plate.
  • 0 ° here means that the flank is aligned perpendicular to the surface of the embossing plate.
  • the flanks can also be arc-shaped, curved and / or stair-shaped, so that the angle of inclination of a flank changes with increasing distance from the surface of the embossing plate.
  • the groove-shaped depressions according to the invention are thus asymmetrically shaped, so that the embossing structures produced with this embossing plate result in a different tilting effect from different viewing directions, depending on which of the two flanks the viewer is looking at.
  • the embossing tool is an embossing stamp or a printing plate, in particular an intaglio printing plate, and the depressions are designed as an engraving in the surface of the embossing tool.
  • a plateau is formed by the flat region, which is arranged between the first flank of a depression and the second flank of the depression adjacent to this depression and is oriented essentially parallel to the surface of the embossing plate.
  • This plateau has the advantage over pointed structures that it is less sensitive to erosion by processing tools with which the embossing tool is engraved, in particular a (wide) laser beam.
  • plateaus are less sensitive to deburring, cleaning and polishing the embossing tool, for example by means of a doctor blade, polishing agent, abrasive, etching process or by means of rotating brushes, and thus have less plate wear.
  • subsequent chrome plating of the embossing tool has better adhesion to the carrier material, which further reduces mechanical wear.
  • essentially parallel means that the angle between the depression or the plateau and the surface of the embossing plate or the groove-shaped depressions relative to one another is preferably 0 ° (exactly parallel) and particularly preferably 0.5 ° to 5 °.
  • the plateau leads to a reduction in the sharpness of the edges, so that a possible paper injury can be prevented during embossing and the durability of the wiping cylinder of a low-pressure printing machine can be increased.
  • the plateaus are also less sensitive to wear from the wiping cylinder.
  • the embossing tool according to the invention is particularly preferably suitable for engraving processes in which a laser beam is used to rotate into a rotating cylindrical workpiece made of plastic, for example Kapton, or of metal, for example Brass, is engraved, the so-called “Computer to Intaglioplate” or “CTiP” process.
  • CTiP Computer to Intaglioplate
  • the invention preferably makes it possible to use CTiP systems and thus to enable the use of “data commercial goods”, that is to say predetermined embossed data for certain denominations of a currency's denominations. Even if the laser diameter is not compensated for, a suitable choice of the plateaus prevents damage to the desired embossed structures by providing sufficiently broad plateaus within the data structure.
  • the invention is not only limited to embossing tools that are engraved using a laser beam. Rather, all other engraving methods known from the prior art can also be used, such as mechanical engraving using a stylus.
  • the cross-sectional area of the groove-shaped depressions arranged essentially parallel to one another is triangular or trapezoidal.
  • a triangular cross-sectional area results in embossed roof-like structures.
  • the ratio of the distance between adjacent engravings and the corresponding engraving depth is 1: 5 to 20: 1, preferably 1: 3 to 10: 1 and particularly preferably 1: 2 to 6: 1 is.
  • the depth of the groove-shaped depressions arranged essentially parallel to one another is 10 ⁇ m to 250 ⁇ m, preferably 10 ⁇ m to 100 ⁇ m and particularly preferably 10 ⁇ m to 80 ⁇ m.
  • At least one of the flat regions which are arranged between the first flank of a depression and the second flank of the depression adjacent to this depression and which are aligned essentially parallel to the surface of the embossing plate, relative to the surface of the Stamping plate is lowered.
  • a second flat region is arranged, which is aligned essentially parallel to the surface of the embossing plate.
  • the width of a flat area i.e. both the "peak” and the “valleys", 1 ⁇ m to 100 ⁇ m, preferably 5 ⁇ m to 50 ⁇ m and particularly preferably 10 ⁇ m to 30 ⁇ m.
  • An optically variable element in the sense of this invention is an element whose visual appearance changes when the element is tilted. For example, when the optically variable element changes its color, a bar appears to move from one side of the element to another, different characters are displayed when the element is tilted, or a so-called pump effect results in the form of an enlarging or reducing outline of an image motif.
  • the substrate into which the embossed structures are embossed is particularly preferably made of paper made from cotton fibers, such as is used for banknotes, for example, 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, i.e. a paper substrate is covered on either side by a plastic sheet, or a combination of paper-plastic sheet-paper, i.e. a substrate made of a plastic film is covered on both sides by paper.
  • the font DE 102 43 653 A9 states in particular that the paper layer usually has a weight of 50 g / m 2 to 100 g / m 2 , preferably of 80 g / m 2 to 90 g / m 2 .
  • any other suitable weight can be used.
  • Valuable documents in 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, packaging and the like.
  • the Fig. 1 shows a side view of an embossing tool known from the prior art in the form of an embossing plate 1, into which a plurality of groove-shaped depressions 2, which are arranged essentially parallel to one another and whose cross-sectional area in this exemplary embodiment has a triangular shape, is engraved.
  • the two flanks 2.1 and 2.2 of each recess 2 each have the same angle of inclination ⁇ with respect to the surface normal of the surface of the embossing plate 1 or also the vertical on the surface of the embossing plate 1.
  • a flat region 3 or a plateau is arranged between the first flank of a depression and the second flank of the depression adjacent to this depression, said plateau being aligned essentially parallel to the surface of the embossing plate.
  • Fig. 2 shows an inventive development of the prior art.
  • the stamping plate 1 Fig. 1 have the depressions 5 of the embossing plate 4 flanks 5.1 and 5.2, which have different angles of inclination with respect to the vertical.
  • the flank 5.1 has the inclination angle ⁇ and the flank 5.2 has an inclination angle close to or equal to 0 ° with respect to the vertical.
  • the flank 5.2 can also have an angle of inclination different from 0 °, provided that this angle is not equal to the angle of inclination ⁇ of the flank 5.1.
  • the width of a flat region 3 or plateau is b 1 , the width of a depression b 2 and the depth of a depression t.
  • the depth-to-width ratio of a depression is thus the ratio t / b 2 .
  • Fig. 3 shows an embossing plate 4 according to the invention, in the opposite of the embossing plate Fig. 2 Between the first flank of a depression and the second flank of this depression, a second flat region 6 or a further plateau 6 is arranged, which is aligned essentially parallel to the surface of the embossing plate.
  • Fig. 4 shows an embossing plate 4 according to the invention, in the opposite of the embossing plate Fig. 2 the areas 3 are lowered from the surface of the embossing plate by the distance a.
  • the distance a is preferably 5 ⁇ m to 100 ⁇ m, particularly preferably 10 ⁇ m to 50 ⁇ m and very particularly preferably 10 ⁇ m to 30 ⁇ m.
  • Fig. 5 shows an embossing plate 4 according to the invention, in the opposite of the embossing plate Fig. 2 the depth of each recess 5 is different. In the illustrated In the exemplary embodiment, the depth of the depressions becomes smaller from left to right. The dashed line represents the depth t of the left depression.
  • Fig. 6 shows an embossing plate 4 according to the invention, in the opposite of the embossing plate Fig. 5 in addition, the distance between the areas 3 and the surface of the embossing plate is also reduced. In the exemplary embodiment shown, the distance between the areas 3 increases from left to right.
  • the dashed lines represent the depth t of the left depression or the upper edge of the embossing plate without depressions.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Credit Cards Or The Like (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Description

Die Erfindung betrifft ein Prägewerkzeug zur Herstellung eines Sicherheitselements mit einer optisch variablen Struktur, wobei die optisch variable Struktur beim Kippen des Sicherheitselementes um eine Achse einen Kippeffekt zeigt. Das Prägewerkzeug besteht hierbei aus einer Prägeplatte mit einer Oberfläche, wobei die Oberfläche der Prägeplatte eine Vielzahl von im Wesentlichen parallel zueinander angeordneten, rinnenförmigen Vertiefungen aufweist. Diese rinnenförmigen Vertiefungen bestehen jeweils aus einer ersten und einer zweiten Flanke, die sich gegenüberliegen, wobei jeweils die erste Flanke einer Vertiefung und die zweite Flanke der dieser Vertiefung benachbarten Vertiefung in Richtung der Oberfläche der Prägeplatte aufeinander zulaufen. Des Weiteren ist jeweils zwischen der ersten Flanke einer Vertiefung und der zweiten Flanke der dieser Vertiefung benachbarten Vertiefung ein ebener Bereich angeordnet, der im Wesentlichen parallel zur Oberfläche der Prägeplatte ausgerichtet ist.The invention relates to an embossing tool for producing a security element with an optically variable structure, the optically variable structure showing a tilting effect when the security element is tilted about an axis. The embossing tool here consists of an embossing plate with a surface, the surface of the embossing plate having a multiplicity of channel-shaped depressions arranged essentially parallel to one another. These channel-shaped depressions each consist of a first and a second flank, which lie opposite one another, the first flank of a depression and the second flank of the depression adjacent to this depression converging towards one another in the direction of the surface of the embossing plate. Furthermore, a flat area is arranged between the first flank of a depression and the second flank of the depression adjacent to this depression, which is aligned essentially parallel to the surface of the embossing plate.

Zum Schutz gegen Nachahmung, insbesondere mit Farbkopierern oder anderen Reproduktionsverfahren, werden Datenträger, wie beispielsweise Banknoten, Wertpapiere, Kredit- oder Ausweiskarten, Pässe, Urkunden und Ähnliches, Labels, Verpackungen oder andere Elemente für die Produktsicherung mit optisch variablen Sicherheitselementen ausgestattet. Der Fälschungsschutz beruht dabei darauf, dass der visuell und einfach und deutlich erkennbare optisch variable Effekt von den oben genannten Reproduktionsgeräten nicht oder nur ungenügend wiedergegeben wird. Insbesondere weisen die optisch variablen Sicherheitselemente eine entsprechende Haptik auf, die schwer zu kopieren, aber leicht und ohne Hilfsmittel zu überprüfen ist.To protect against counterfeiting, especially with color copiers or other reproduction methods, data carriers such as banknotes, securities, credit or identification cards, passports, certificates and the like, labels, packaging or other elements for product security are equipped with optically variable security elements. The protection against counterfeiting is based on the fact that the visually and easily and clearly recognizable optically variable effect is not or only insufficiently reproduced by the above-mentioned reproduction devices. In particular, the optically variable security elements have a corresponding haptic that is difficult to copy, but easy to check and without tools.

Ein derartiges optisch variables Sicherheitselement, das beim Kippen des Sicherheitselementes um eine Achse einen Kippeffekt zeigt, ist beispielsweise aus WO 2013/045055 A1 bekannt. Hierbei ist ein Sicherheitselement mit einer optisch variablen Struktur bekannt, die eine Vielzahl von ersten Prägestrukturen aufweist. Jede der ersten Prägestrukturen besteht aus mindestens zwei Flanken, die in mindestens einem bestimmten Winkel aufeinander zulaufen. Die WO 2013/045055 A1 betrifft weiterhin ein Prägewerkzeug zur Herstellung dieses Sicherheitselements. Hierbei weist eine Prägeplatte Vertiefungen auf, mit denen prismen- oder pyramidenförmige Prägestrukturen erzeugt werden. Ein Substrat wird auf die Oberfläche der Prägeplatte aufgelegt, mit hohem mechanischem Druck in die Vertiefungen gepresst und verformt. Vorteilhaft weist die Grundprägelinie der Prägeplatte eine gerade Oberkante auf, welche stabil der Laserung standhält und stets "unverletzt" gleichbleibend ist.Such an optically variable security element, which shows a tilting effect when the security element is tilted about an axis, is, for example, out of WO 2013/045055 A1 known. Here, a security element with an optically variable structure is known, which has a plurality of first embossed structures. Each of the first embossed structures consists of at least two flanks that converge at least at a certain angle. The WO 2013/045055 A1 also relates to an embossing tool for producing this security element. Here, an embossing plate has depressions with which prism or pyramid-shaped embossing structures are produced. A substrate is placed on the surface of the embossing plate, pressed into the depressions with high mechanical pressure and deformed. The basic embossing line of the embossing plate advantageously has a straight upper edge, which stands up to the lasering and is always "undamaged" constant.

Nachteilig an der Grundform der prismen- oder pyramidenförmigen Prägestrukturen aus WO 2013/045055 A1 ist jedoch, dass sie in ihrer Grundform aus allen Betrachtungsrichtungen den gleichen Kippeffekt zeigen. Zur Lösung dieses Nachteils schlägt die WO 2013/045055 A1 vor, dass in mindestens einem Teilbereich der optisch variablen Struktur mindestens eine Flanke der ersten Prägestrukturen jeweils mindestens eine zusätzliche Prägestruktur aufweist, die auf die Flanke der ersten Prägestrukturen aufgesetzt oder in die Flanke der ersten Prägestrukturen eingesetzt ist. Eine derartige Prägestruktur setzt jedoch einen erhöhten technischen Aufwand bei der Gravur der entsprechenden Prägeplatte voraus.A disadvantage of the basic shape of the prismatic or pyramidal embossed structures WO 2013/045055 A1 is, however, that their basic form shows the same tipping effect from all viewing directions. To solve this disadvantage, the WO 2013/045055 A1 proposes that in at least one partial area of the optically variable structure at least one flank of the first embossed structures each has at least one additional embossed structure which is placed on the flank of the first embossed structures or inserted into the flank of the first embossed structures. Such an embossing structure, however, requires an increased technical outlay when engraving the corresponding embossing plate.

Aus WO 00/20217 A1 ist eine Stichtiefdruckplatte zum vollflächigen Drucken zusammenhängender Druckbildbereiche bekannt, bei der das Druckbild in Form einer Gravur in die Druckplattenoberfläche eingearbeitet ist. Hierbei sind in den gravierten, farbaufnehmenden Bereichen Trennstege vorgesehen, welche die gravierten Bereiche in Teilbereiche aufteilen, wobei die Trennstege derart gestaltet sind, dass sie keine Flächen in Höhe der Druckplattenoberfläche aufweisen. Zusätzlich können die nach außen zeigenden Enden der Trennstege nach Gravur der die Feinstruktur bildenden Vertiefungen entfernt werden. Diese als Plateau ausgebildeten oberen Enden der Trennstege erzeugen im Druckbild feine helle Linien.Out WO 00/20217 A1 a intaglio printing plate for full-surface printing of contiguous print image areas is known, in which the print image is worked into the surface of the printing plate in the form of an engraving. Here, dividers are provided in the engraved, ink-receiving areas, which divide the engraved areas into partial areas, the dividers being designed in such a way that they have no surfaces at the level of the printing plate surface. In addition, the ends of the separating webs pointing outwards can be removed after the recesses forming the fine structure have been engraved. These upper ends of the dividers, which are designed as a plateau, produce fine bright lines in the printed image.

Mit der Stichtiefdruckplatte aus WO 00/20217 A1 werden jedoch keine Prägestrukturen erzeugt, die einen vom Betrachtungswinkel abhängigen Kippeffekt zeigen. Selbst, wenn diese Prägestrukturen einen Kippeffekt zeigen würden, würden sie aus allen Betrachtungsrichtungen den gleichen Kippeffekt zeigen.With the intaglio printing plate WO 00/20217 A1 However, no embossed structures are produced that show a tilting effect that depends on the viewing angle. Even if these embossed structures showed a tilting effect, they would show the same tilting effect from all viewing directions.

Aus EP 0 429 782 A1 ist eine beugungsoptisch wirksame Beugungsstruktur bekannt, die jeweils aus einer beugungsoptisch wirksamen Mikrostruktur bestehen, wobei die Mikrostrukturen annähernd 300 bis 3000 Linien pro Millimeter beziehungsweise eine Linienbreite von 300 nm bis 3 µm aufweisen.Out EP 0 429 782 A1 a diffraction-optically effective diffraction structure is known, each consisting of a diffraction-optically effective microstructure, the microstructures having approximately 300 to 3000 lines per millimeter or a line width of 300 nm to 3 μm.

Aus EP 2 886 356 A2 ist eine feine Struktur bekannt, die innerhalb einer makroskopischen Prägestruktur angeordnet ist. Diese feine Struktur weist eine Tiefe von 0,1 µm bis 10 µm auf und ist beispielsweise eine Beugungsstruktur. Die makroskopische Prägestruktur hingegen weist eine Tiefe in einem Bereich von 13 µm bis 30 µm auf.Out EP 2 886 356 A2 a fine structure is known which is arranged within a macroscopic embossed structure. This fine structure has a depth of 0.1 µm to 10 µm and is, for example, a diffraction structure. The macroscopic embossed structure, on the other hand, has a depth in a range from 13 µm to 30 µm.

Der Erfindung liegt deshalb die Aufgabe zugrunde, ein gattungsgemäßes Prägewerkzeug derart weiterzubilden, dass die Nachteile des Standes der Technik behoben werden.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.

Diese Aufgabe wird durch die Merkmale des unabhängigen Anspruchs 1 gelöst. Weiterbildungen der Erfindung sind Gegenstand der abhängigen Ansprüche.This object is achieved by the features of independent claim 1. Further developments of the invention are the subject of the dependent claims.

Erfindungsgemäß weist die erste Flanke jeder rinnenförmigen Vertiefung einen anderen Neigungswinkel gegenüber der Oberfläche der Prägeplatte auf als die entsprechende zweite, gegenüberliegende Flanke. Die erste Flanke ist hierbei bevorzugt steiler als die zweite Flanke. Der Neigungswinkel der ersten Flanke beträgt bevorzugt 0° bis 40°, besonders bevorzugt 10° bis 30° und ganz besonders bevorzugt 20° bis 30° gegenüber der Flächennormalen der Oberfläche der Prägeplatte oder der Senkrechten auf der Oberfläche der Prägeplatte. 0° bedeutet hierbei, dass die Flanke senkrecht zur Oberfläche der Prägeplatte ausgerichtet ist. Die Flanken können auch bogenförmig, gekrümmt und/oder treppenförmig ausgestaltet sein, so dass sich der Neigungswinkel einer Flanke mit zunehmendem Abstand von der Oberfläche der Prägeplatte ändert.According to the invention, the first flank of each groove-shaped depression has a different angle of inclination with respect to the surface of the embossing plate than the corresponding second, opposite flank. The first flank is preferably steeper than the second flank. The angle of inclination of the first flank is preferably 0 ° to 40 °, particularly preferably 10 ° to 30 ° and very particularly preferably 20 ° to 30 ° with respect to the surface normal of the surface of the embossing plate or the perpendicular to the surface of the embossing plate. 0 ° here means that the flank is aligned perpendicular to the surface of the embossing plate. The flanks can also be arc-shaped, curved and / or stair-shaped, so that the angle of inclination of a flank changes with increasing distance from the surface of the embossing plate.

Die erfindungsgemäßen rinnenförmigen Vertiefungen sind somit asymmetrisch ausgeformt, so dass sich bei mit dieser Prägeplatte erzeugten Prägestrukturen ein aus unterschiedlichen Betrachtungsrichtungen unterschiedlicher Kippeffekt ergibt, je nach dem, auf welche der beiden Flanken der Betrachter blickt.The groove-shaped depressions according to the invention are thus asymmetrically shaped, so that the embossing structures produced with this embossing plate result in a different tilting effect from different viewing directions, depending on which of the two flanks the viewer is looking at.

Gemäß einer bevorzugten Ausführungsform ist vorgesehen, dass das Prägewerkzeug ein Prägestempel oder eine Druckplatte ist, insbesondere eine Stichtiefdruckplatte ist, und die Vertiefungen als Gravur in der Oberfläche des Prägewerkzeuges ausgeführt sind.According to a preferred embodiment, it is provided that the embossing tool is an embossing stamp or a printing plate, in particular an intaglio printing plate, and the depressions are designed as an engraving in the surface of the embossing tool.

Zusätzlich wird durch den ebenen Bereich, der jeweils zwischen der ersten Flanke einer Vertiefung und der zweiten Flanke der dieser Vertiefung benachbarten Vertiefung angeordnet und im Wesentlichen parallel zur Oberfläche der Prägeplatte ausgerichtet ist, ein Plateau gebildet. Dieses Plateau hat gegenüber spitzen Strukturen den Vorteil, dass es unempfindlicher gegen Erosion durch Bearbeitungswerkzeuge ist, mit denen das Prägewerkzeug graviert wird, insbesondere einen (breiten) Laserstrahl. Des Weiteren sind Plateaus unempfindlicher bei Entgratung, Reinigung und Polieren des Prägewerkzeugs, beispielsweise mittels Rakel, Poliermittel, Schleifmittel, Ätzverfahren oder mittels rotierender Bürsten und weisen somit einen geringeren Plattenverschleiß auf. Des Weiteren hat eine nachgelagerte Verchromung des Prägewerkzeugs eine bessere Haftung auf dem Trägermaterial, wodurch sich der mechanische Verschleiß zusätzlich reduziert.In addition, a plateau is formed by the flat region, which is arranged between the first flank of a depression and the second flank of the depression adjacent to this depression and is oriented essentially parallel to the surface of the embossing plate. This plateau has the advantage over pointed structures that it is less sensitive to erosion by processing tools with which the embossing tool is engraved, in particular a (wide) laser beam. Furthermore, plateaus are less sensitive to deburring, cleaning and polishing the embossing tool, for example by means of a doctor blade, polishing agent, abrasive, etching process or by means of rotating brushes, and thus have less plate wear. Furthermore, subsequent chrome plating of the embossing tool has better adhesion to the carrier material, which further reduces mechanical wear.

Im Wesentlichen parallel bedeutet hierbei, dass der Winkel zwischen der Vertiefung oder dem Plateau und der Oberfläche der Prägeplatte bzw. den rinnenförmigen Vertiefungen zueinander bevorzugt 0° (exakt parallel) und besonders bevorzugt 0,5° bis 5° beträgt.In this context, essentially parallel means that the angle between the depression or the plateau and the surface of the embossing plate or the groove-shaped depressions relative to one another is preferably 0 ° (exactly parallel) and particularly preferably 0.5 ° to 5 °.

Besondere Vorteile des erfindungsgemäßen Prägewerkzeugs sind weiterhin, dass das Plateau zu einer Reduzierung der Kantenschärfe führt, so dass während der Prägung einer möglichen Papierverletzung vorgebeugt und die Haltbarkeit des Wischzylinders einer Stichtiefduckmaschine erhöht werden kann. Umgekehrt sind die Plateaus auch unempfindlicher gegen Abnutzung durch den Wischzylinder.Special advantages of the embossing tool according to the invention are furthermore that the plateau leads to a reduction in the sharpness of the edges, so that a possible paper injury can be prevented during embossing and the durability of the wiping cylinder of a low-pressure printing machine can be increased. Conversely, the plateaus are also less sensitive to wear from the wiping cylinder.

Das erfindungsgemäße Prägewerkzeug eignet sich besonders bevorzugt bei Gravurverfahren, bei denen mittels Laserstrahl in ein rotierendes zylindrisches Werkstück aus Kunststoff, beispielsweise Kapton, oder aus Metall, beispielsweise Messing, graviert wird, das sogenannte "Computer to Intaglioplate"- bzw. "CTiP"-Verfahren. Dabei ist es durch die Erfindung bevorzugt möglich, CTiP-Anlagen zum Einsatz kommen zu lassen und so die Verwendung von "Daten-Handelsware" zu ermöglichen, also vorgegebenen Prägedaten für bestimmte Banknoten-Nennwerte einer Währung. Auch bei fehlender Kompensation des Laserdurchmessers, kann durch geeignete Wahl der Plateaus eine Verletzung der gewünschten Prägestrukturen vermieden werden, indem innerhalb der Datenstruktur ausreichend breite Plateaus vorgehalten werden.The embossing tool according to the invention is particularly preferably suitable for engraving processes in which a laser beam is used to rotate into a rotating cylindrical workpiece made of plastic, for example Kapton, or of metal, for example Brass, is engraved, the so-called "Computer to Intaglioplate" or "CTiP" process. The invention preferably makes it possible to use CTiP systems and thus to enable the use of “data commercial goods”, that is to say predetermined embossed data for certain denominations of a currency's denominations. Even if the laser diameter is not compensated for, a suitable choice of the plateaus prevents damage to the desired embossed structures by providing sufficiently broad plateaus within the data structure.

Des Weiteren können nun Systeme mit einer geringeren physikalischen Auflösung ein ansprechendes Ergebnis erzielen.Furthermore, systems with a lower physical resolution can now achieve an appealing result.

Die Erfindung ist jedoch nicht nur auf Prägewerkzeuge beschränkt, die mittels Laserstrahl graviert werden. Vielmehr können auch alle anderen aus dem Stand der Technik bekannten Gravurverfahren verwendet werden, wie beispielsweise mechanische Gravur mittels Stichel.However, the invention is not only limited to embossing tools that are engraved using a laser beam. Rather, all other engraving methods known from the prior art can also be used, such as mechanical engraving using a stylus.

Gemäß einer bevorzugten Ausführungsform ist vorgesehen, dass die Querschnittsfläche der im Wesentlichen parallel zueinander angeordneten, rinnenförmigen Vertiefungen dreieckig oder trapezförmig ausgestaltet ist. Beispielsweise ergibt eine dreieckige Querschnittsfläche walmdachartige Prägestrukturen.According to a preferred embodiment, it is provided that the cross-sectional area of the groove-shaped depressions arranged essentially parallel to one another is triangular or trapezoidal. For example, a triangular cross-sectional area results in embossed roof-like structures.

Besonders zweckmäßig ist es darüber hinaus, wenn das Verhältnis aus dem Abstand benachbarter Gravuren und der entsprechenden Gravurtiefe, das sogenannte Aspektverhältnis, 1:5 bis 20:1, bevorzugt 1:3 bis 10:1 und besonders bevorzugt 1:2 bis 6:1 beträgt.It is also particularly expedient if the ratio of the distance between adjacent engravings and the corresponding engraving depth, the so-called aspect ratio, is 1: 5 to 20: 1, preferably 1: 3 to 10: 1 and particularly preferably 1: 2 to 6: 1 is.

Erfindungsgemäß beträgt die Tiefe der im Wesentlichen parallel zueinander angeordneten, rinnenförmigen Vertiefungen 10 µm bis 250 µm, bevorzugt 10 µm bis 100 µm und besonders bevorzugt 10 µm bis 80 µm.According to the invention, the depth of the groove-shaped depressions arranged essentially parallel to one another is 10 μm to 250 μm, preferably 10 μm to 100 μm and particularly preferably 10 μm to 80 μm.

Gemäß einer weiteren bevorzugten Ausführungsform ist vorgesehen, dass mindestens einer der ebenen Bereiche, die zwischen der ersten Flanke einer Vertiefung und der zweiten Flanke der dieser Vertiefung benachbarten Vertiefung angeordnet sind, und die im Wesentlichen parallel zur Oberfläche der Prägeplatte ausgerichtet sind, gegenüber der Oberfläche der Prägeplatte abgesenkt ist.According to a further preferred embodiment, it is provided that at least one of the flat regions which are arranged between the first flank of a depression and the second flank of the depression adjacent to this depression and which are aligned essentially parallel to the surface of the embossing plate, relative to the surface of the Stamping plate is lowered.

Gemäß einer weiteren bevorzugten Ausführungsform ist vorgesehen, dass jeweils zwischen der ersten Flanke einer Vertiefung und der zweiten Flanke dieser Vertiefung ein zweiter ebener Bereich angeordnet ist, der im Wesentlichen parallel zur Oberfläche der Prägeplatte ausgerichtet ist. Hierbei weisen nicht nur die "Gipfel" der Vertiefungen, die der Oberfläche der Prägeplatte zugewandt sind, ein Plateau auf, sondern auch die "Täler", die von der Oberfläche der Prägeplatte abgewandt sind.According to a further preferred embodiment, it is provided that between the first flank of a depression and the second flank of this depression a second flat region is arranged, which is aligned essentially parallel to the surface of the embossing plate. Here, not only do the "peaks" of the depressions which face the surface of the embossing plate have a plateau, but also the "valleys" which face away from the surface of the embossing plate.

Erfindungsgemäß beträgt die Breite eines ebenen Bereichs, d.h. sowohl der "Gipfel" als auch der "Täler", 1 µm bis 100 µm, bevorzugt 5 µm bis 50 µm und besonders bevorzugt 10 µm bis 30 µm.According to the invention, the width of a flat area, i.e. both the "peak" and the "valleys", 1 µm to 100 µm, preferably 5 µm to 50 µm and particularly preferably 10 µm to 30 µm.

Ein optisch variables Element im Sinne dieser Erfindung ist ein Element, dessen visuelles Erscheinungsbild sich bei Verkippen des Elements ändert. Beispielsweise ändert sich bei Verkippen des optisch variablen Elements dessen Farbe, bewegt sich scheinbar ein Balken von einer Seite des Elements zu einer anderen Seite, werden beim Verkippen unterschiedliche Zeichen dargestellt oder ergibt sich ein sogenannter Pumpeffekt in Form einer sich vergrößernden oder verkleinernden Umrisslinie eines Bildmotivs.An optically variable element in the sense of this invention is an element whose visual appearance changes when the element is tilted. For example, when the optically variable element changes its color, a bar appears to move from one side of the element to another, different characters are displayed when the element is tilted, or a so-called pump effect results in the form of an enlarging or reducing outline of an image motif.

Das Substrat, in das die Prägestrukturen eingeprägt werden, 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.The substrate into which the embossed structures are embossed is particularly preferably made of paper made from cotton fibers, such as is used for banknotes, for example, 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, i.e. a paper substrate is covered on either side by a plastic sheet, or a combination of paper-plastic sheet-paper, i.e. a substrate made of a plastic film is covered on both sides by paper.

Angaben zum Gewicht des verwendeten Substrats sind beispielsweise in der Schrift DE 102 43 653 A9 angegeben, deren Ausführungen diesbezüglich vollumfänglich in diese Anmeldung aufgenommen werden. Die Schrift DE 102 43 653 A9 führt insbesondere aus, dass die Papierschicht üblicherweise ein Gewicht von 50 g/m2 bis 100 g/m2 aufweist, vorzugsweise von 80 g/m2 bis 90 g/m2. Selbstverständlich kann je nach Anwendung jedes andere geeignete Gewicht eingesetzt werden.Information on the weight of the substrate used is, for example, in the document DE 102 43 653 A9 specified, the statements in this regard are fully included in this application. The font DE 102 43 653 A9 states in particular that the paper layer usually has a weight of 50 g / m 2 to 100 g / m 2 , preferably of 80 g / m 2 to 90 g / m 2 . Of course, depending on the application, any other suitable weight can be used.

Wertdokumente, in denen 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, Verpackungen und dergleichen.Valuable documents in 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, packaging and the like.

Die vereinfachte Benennung Wertdokument schließt alle oben genannten Materialien, Dokumente und Produktsicherungsmittel ein.The simplified naming of the value document includes all of the above materials, documents and product securing means.

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 serve only to improve clarity. Furthermore, the embodiments described in the following exemplary embodiments are reduced to the essential core information for better understanding. Much more complex patterns or images can be used in practical implementation.

Im Einzelnen zeigen schematisch in Seitenansicht:

Fig. 1
ein Prägewerkzeug aus dem Stand der Technik,
Fig. 2
ein erfindungsgemäßes Prägewerkzeug nach einem ersten Ausführungsbeispiel,
Fig. 3
ein erfindungsgemäßes Prägewerkzeug nach einem zweiten Ausführungsbeispiel,
Fig. 4
ein erfindungsgemäßes Prägewerkzeug nach einem dritten Ausführungsbeispiel,
Fig. 5
ein erfindungsgemäßes Prägewerkzeug nach einem vierten Ausführungsbeispiel,
Fig. 6
ein erfindungsgemäßes Prägewerkzeug nach einem fünften Ausführungsbeispiel.
In detail, a schematic side view shows:
Fig. 1
a stamping tool from the prior art,
Fig. 2
an embossing tool according to the invention according to a first embodiment,
Fig. 3
an embossing tool according to the invention according to a second embodiment,
Fig. 4
an embossing tool according to the invention according to a third embodiment,
Fig. 5
an embossing tool according to the invention according to a fourth embodiment,
Fig. 6
an embossing tool according to the invention according to a fifth embodiment.

Die Fig. 1 zeigt in Seitenansicht ein aus dem Stand der Technik bekanntes Prägewerkzeug in Form einer Prägeplatte 1, in die eine Vielzahl von im Wesentlichen parallel zueinander angeordneten, rinnenförmigen Vertiefungen 2 graviert ist, deren Querschnittsfläche in diesem Ausführungsbeispiel dreieckförmig ausgestaltet ist. Die beiden Flanken 2.1 und 2.2 jeder Vertiefung 2 weisen jeweils den gleichen Neigungswinkel α gegenüber der Flächennormalen der Oberfläche der Prägeplatte 1 oder auch der Senkrechten auf der Oberfläche der Prägeplatte 1 auf.The Fig. 1 shows a side view of an embossing tool known from the prior art in the form of an embossing plate 1, into which a plurality of groove-shaped depressions 2, which are arranged essentially parallel to one another and whose cross-sectional area in this exemplary embodiment has a triangular shape, is engraved. The two flanks 2.1 and 2.2 of each recess 2 each have the same angle of inclination α with respect to the surface normal of the surface of the embossing plate 1 or also the vertical on the surface of the embossing plate 1.

Jeweils zwischen der ersten Flanke einer Vertiefung und der zweiten Flanke der dieser Vertiefung benachbarten Vertiefung ist ein ebener Bereich 3 bzw. ein Plateau angeordnet, der im Wesentlichen parallel zur Oberfläche der Prägeplatte ausgerichtet ist.A flat region 3 or a plateau is arranged between the first flank of a depression and the second flank of the depression adjacent to this depression, said plateau being aligned essentially parallel to the surface of the embossing plate.

Fig. 2 zeigt eine erfindungsgemäße Weiterentwicklung des Standes der Technik. Gegenüber der Prägeplatte 1 aus Fig. 1 haben die Vertiefungen 5 der erfindungsgemäßen Prägeplatte 4 Flanken 5.1 und 5.2, die unterschiedliche Neigungswinkel gegenüber der Senkrechten aufweisen. So weist die Flanke 5.1 den Neigungswinkel β und die Flanke 5.2 einen Neigungswinkel nahe bzw. gleich 0° gegenüber der Senkrechten auf. Selbstverständlich kann die Flanke 5.2 auch einen von 0° verschiedenen Neigungswinkel aufweisen, vorausgesetzt, dass dieser Winkel ungleich dem Neigungswinkel β der Flanke 5.1 ist. Fig. 2 shows an inventive development of the prior art. Opposite the stamping plate 1 Fig. 1 have the depressions 5 of the embossing plate 4 flanks 5.1 and 5.2, which have different angles of inclination with respect to the vertical. The flank 5.1 has the inclination angle β and the flank 5.2 has an inclination angle close to or equal to 0 ° with respect to the vertical. Of course, the flank 5.2 can also have an angle of inclination different from 0 °, provided that this angle is not equal to the angle of inclination β of the flank 5.1.

Die Breite eines ebenen Bereichs 3 bzw. Plateaus ist b1, die Breite einer Vertiefung b2 und die Tiefe einer Vertiefung t. Das Tiefen-zu-Breitenverhältnis einer Vertiefung ist somit das Verhältnis t/b2.The width of a flat region 3 or plateau is b 1 , the width of a depression b 2 and the depth of a depression t. The depth-to-width ratio of a depression is thus the ratio t / b 2 .

Fig. 3 zeigt eine erfindungsgemäße Prägeplatte 4, bei der gegenüber der Prägeplatte aus Fig. 2 jeweils zwischen der ersten Flanke einer Vertiefung und der zweiten Flanke dieser Vertiefung ein zweiter ebener Bereich 6 bzw. ein weiteres Plateau 6 angeordnet ist, das im Wesentlichen parallel zur Oberfläche der Prägeplatte ausgerichtet ist. Fig. 3 shows an embossing plate 4 according to the invention, in the opposite of the embossing plate Fig. 2 Between the first flank of a depression and the second flank of this depression, a second flat region 6 or a further plateau 6 is arranged, which is aligned essentially parallel to the surface of the embossing plate.

Fig. 4 zeigt eine erfindungsgemäße Prägeplatte 4, bei der gegenüber der Prägeplatte aus Fig. 2 die Bereiche 3 gegenüber der Oberfläche der Prägeplatte abgesenkt um den Abstand a sind. Selbstverständlich ist es auch möglich, dass alle Bereiche 3 unterschiedliche Abstände gegenüber der Oberfläche der Prägeplatte aufweisen. Der Abstand a beträgt bevorzugt 5 µm bis 100 µm, besonders bevorzugt 10 µm bis 50 µm und ganz besonders bevorzugt 10 µm bis 30 µm. Fig. 4 shows an embossing plate 4 according to the invention, in the opposite of the embossing plate Fig. 2 the areas 3 are lowered from the surface of the embossing plate by the distance a. Of course, it is also possible for all areas 3 to have different distances from the surface of the embossing plate. The distance a is preferably 5 μm to 100 μm, particularly preferably 10 μm to 50 μm and very particularly preferably 10 μm to 30 μm.

Fig. 5 zeigt eine erfindungsgemäße Prägeplatte 4, bei der gegenüber der Prägeplatte aus Fig. 2 die Tiefe jeder Vertiefung 5 unterschiedlich ist. Im dargestellten Ausführungsbeispiel wird die Tiefe der Vertiefungen von links nach rechts kleiner. Die gestrichelte Linie stellt die Tiefe t der linken Vertiefung dar. Fig. 5 shows an embossing plate 4 according to the invention, in the opposite of the embossing plate Fig. 2 the depth of each recess 5 is different. In the illustrated In the exemplary embodiment, the depth of the depressions becomes smaller from left to right. The dashed line represents the depth t of the left depression.

Fig. 6 zeigt eine erfindungsgemäße Prägeplatte 4, bei der gegenüber der Prägeplatte aus Fig. 5 zusätzlich auch der Abstand der Bereiche 3 gegenüber der Oberfläche der Prägeplatte abgesenkt ist. Im dargestellten Ausführungsbeispiel wird der Abstand der Bereiche 3 von links nach rechts größer. Die gestrichelten Linien stellen die Tiefe t der linken Vertiefung bzw. die Oberkante der Prägeplatte ohne Vertiefungen dar. Fig. 6 shows an embossing plate 4 according to the invention, in the opposite of the embossing plate Fig. 5 in addition, the distance between the areas 3 and the surface of the embossing plate is also reduced. In the exemplary embodiment shown, the distance between the areas 3 increases from left to right. The dashed lines represent the depth t of the left depression or the upper edge of the embossing plate without depressions.

Claims (8)

  1. Embossing tool for producing a security element with an optically variable structure, wherein the optically variable structure exhibits a tilting effect when the security element is tilted about an axis, wherein the embossing tool comprises an embossing plate having a surface, wherein the surface of the embossing plate has a multiplicity of channel-like depressions arranged substantially parallel to one another, wherein the channel-like depressions each comprise a first and a second flank which lie opposite each other, wherein in each case the first flank of a depression and the second flank of the depression adjacent to this depression converge towards each other in the direction of the surface of the embossing plate, wherein in each case a flat region which is aligned substantially parallel to the surface of the embossing plate is arranged between the first flank of a depression and the second flank of the depression adjacent to this depression,
    characterized in that the first flank of each channel-like depression has a different angle of inclination with respect to the surface of the embossing plate from the corresponding second flank, in that the depth of the depressions is 10 µm to 250 µm, and in that the width of a flat region is 1 µm to 100 µm.
  2. Embossing tool according to Claim 1, characterized in that the embossing tool is an embossing punch or a printing plate, in particular an intaglio printing plate, and the depressions are designed as an engraving in the surface of the embossing tool.
  3. Embossing tool according to Claim 1 or 2, characterized in that the cross-sectional area of the depressions is configured to be triangular or trapezoidal.
  4. Embossing tool according to one of the preceding claims, characterized in that the ratio of the spacing of adjacent engravings and the corresponding engraving depth, what is known as the aspect ratio, is 1:5 to 20:1, preferably 1:3 to 10:1 and particularly preferably 1:2 to 6:1.
  5. Embossing tool according to one of the preceding claims, characterized in that the depth of the depressions is 10 µm to 100 µm and particularly preferably 10 µm to 80 µm.
  6. Embossing tool according to one of the preceding claims, characterized in that at least one of the flat regions which is arranged between the first flank of a depression and the second flank of the depression adjacent to this depression, and which is aligned substantially parallel to the surface of the embossing plate, is lowered with respect to the surface of the embossing plate.
  7. Embossing tool according to one of the preceding claims, characterized in that a second flat region, which is aligned substantially parallel to the surface of the embossing plate, is respectively arranged between the first flank of a depression and the second flank of this depression.
  8. Embossing tool according to one of the preceding claims, characterized in that the width of a flat region is 5 µm to 50 µm and particularly preferably 10 µm to 30 µm.
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IT201800007607A1 (en) * 2018-07-30 2020-01-30 Focus Trade Srl PLATES AND EMBOSSING METHOD
DE102019124004A1 (en) * 2019-09-06 2021-03-11 Hueck Rheinische Gmbh Press tool, workpiece, method for producing a pressing tool and method for producing a workpiece
CN110712443B (en) * 2019-10-12 2021-12-14 成都印钞有限公司 Concave-convex texture mold and manufacturing method and application thereof

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