EP3124285B1 - Outil d'estampage destine a fabriquer un element de securite ayant une structure optique variable - Google Patents

Outil d'estampage destine a fabriquer un element de securite ayant une structure optique variable 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
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.)
Active
Application number
EP16001620.0A
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German (de)
English (en)
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EP3124285A1 (fr
Inventor
Karlheinz Mayer
Walter DÖRFLER
Thanh-Hao Huynh
Peter Franz
Christoph Mengel
Marco Viticoli
Mario Alessandrini
Luigi Damiano Russo
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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Application filed by Giesecke and Devrient Currency Technology GmbH filed Critical Giesecke and Devrient Currency Technology GmbH
Publication of EP3124285A1 publication Critical patent/EP3124285A1/fr
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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)

Claims (8)

  1. Outil d'estampage pour la fabrication d'un élément de sécurité comprenant une structure optiquement variable, la structure optiquement variable, lors du basculement de l'élément de sécurité autour d'un axe, indiquant un effet de basculement,
    l'outil d'estampage se composant d'une plaque d'estampage avec une surface, la surface de la plaque d'estampage présentant une pluralité de renfoncements en forme de rainure disposés de manière essentiellement parallèle les uns aux autres, les renfoncements en forme de rainure se composant à chaque fois d'un premier et d'un deuxième flanc opposés l'un à l'autre, le premier flanc d'un renfoncement et le deuxième flanc du renfoncement adjacent à ce renfoncement convergeant à chaque fois l'un vers l'autre dans la direction de la surface de la plaque d'estampage, une région plane étant disposée à chaque fois entre le premier flanc d'un renfoncement et le deuxième flanc du renfoncement adjacent à ce renfoncement, laquelle région est orientée de manière essentiellement parallèle à la surface de la plaque d'estampage,
    caractérisé en ce que le premier flanc de chaque renfoncement en forme de rainure présente un angle d'inclinaison par rapport à la surface de la plaque d'estampage différent de celui du deuxième flanc correspondant, en ce que la profondeur des renfoncements mesure 10 µm à 250 µm et en ce que la largeur d'une région plane mesure 1 µm à 100 µm.
  2. Outil d'estampage selon la revendication 1, caractérisé en ce que l'outil d'estampage est un poinçon d'estampage ou une plaque de pression, en particulier une plaque d'impression taille-douce, et les renfoncements sont réalisés sous forme de gravures dans la surface de l'outil d'estampage.
  3. Outil d'estampage selon la revendication 1 ou 2, caractérisé en ce que la surface en section transversale des renfoncements est configurée sous forme triangulaire ou trapézoïdale.
  4. Outil d'estampage selon l'une quelconque des revendications précédentes, caractérisé en ce que le rapport de la distance entre des gravures adjacentes et la profondeur de gravures correspondante, que l'on appelle le rapport d'aspect, est de 1:5 à 20:1, de préférence de 1:3 à 10:1, et particulièrement préférablement de 1:2 à 6:1.
  5. Outil d'estampage selon l'une quelconque des revendications précédentes, caractérisé en ce que la profondeur des renfoncements mesure 10 µm à 100 µm et particulièrement préférablement 10 µm à 80 µm.
  6. Outil d'estampage selon l'une quelconque des revendications précédentes, caractérisé en ce qu'au moins l'une des régions planes qui sont disposées entre le premier flanc d'un renfoncement et le deuxième flanc du renfoncement adjacent à ce renfoncement, et qui sont orientées essentiellement parallèlement à la surface de la plaque d'estampage, est renfoncée par rapport à la surface de la plaque d'estampage.
  7. Outil d'estampage selon l'une quelconque des revendications précédentes, caractérisé en ce qu'à chaque fois entre le premier flanc d'un renfoncement et le deuxième flanc de ce renfoncement est disposée une deuxième région plane qui est orientée essentiellement parallèlement à la surface de la plaque d'estampage.
  8. Outil d'estampage selon l'une quelconque des revendications précédentes, caractérisé en ce que la largeur d'une région plane mesure 5 µm à 50 µm et particulièrement préférablement 10 µm à 30 µm.
EP16001620.0A 2015-07-27 2016-07-25 Outil d'estampage destine a fabriquer un element de securite ayant une structure optique variable Active EP3124285B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015009786.5A DE102015009786A1 (de) 2015-07-27 2015-07-27 Prägewerkzeug zur Herstellung eines Sicherheitselements mit einer optisch variablen Struktur

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Publication Number Publication Date
EP3124285A1 EP3124285A1 (fr) 2017-02-01
EP3124285B1 true EP3124285B1 (fr) 2020-06-17

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
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DE102017010913B3 (de) 2017-11-25 2019-01-24 Sack & Kiesselbach Maschinenfabrik Gmbh Verfahren zum Betreiben einer Prägevorrichtung und Prägevorrichtung
DE102018000193A1 (de) 2018-01-12 2019-07-18 Giesecke+Devrient Currency Technology Gmbh Sicherheitselement mit einer optisch variablen Prägestruktur
IT201800007607A1 (it) * 2018-07-30 2020-01-30 Focus Trade Srl Piastre e metodo di goffratura
DE102019124004A1 (de) * 2019-09-06 2021-03-11 Hueck Rheinische Gmbh Presswerkzeug, Werkstück, Verfahren zum Herstellen eines Presswerkzeugs und Verfahren zum Herstellen eines Werkstücks
CN110712443B (zh) * 2019-10-12 2021-12-14 成都印钞有限公司 一种凹凸纹理模具及其制作方法、应用

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US5538753A (en) 1991-10-14 1996-07-23 Landis & Gyr Betriebs Ag Security element
EP1878584A2 (fr) 2006-07-13 2008-01-16 OVD Kinegram AG Corps multicouche à micro-optique
EP1990211A2 (fr) 2007-05-07 2008-11-12 JDS Uniphase Corporation Surfaces structurées qui exposent des couleurs par rotation
WO2010100360A1 (fr) 2009-03-04 2010-09-10 Oberthur Technologies Element de securite pour document-valeur
EP2460665A1 (fr) 2009-07-31 2012-06-06 National Printing Bureau, Incorporated Administrative Agency Corps formé à motif d'image latente
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EP2554397A1 (fr) 2011-08-05 2013-02-06 ALLTEC Angewandte Laserlicht Technologie Gesellschaft mit beschränkter Haftung Structure de gaufrage
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EP2985154A1 (fr) 2013-04-09 2016-02-17 Federalnoe Gosudarstvennoe Unitarnoe Predpriyatie "Goznak" (FGUP "Goznak") Article stratifié sur une base en papier ou en polymère (et variantes) et son procédé de fabrication
EP2886356A2 (fr) 2013-11-21 2015-06-24 Giesecke & Devrient GmbH Procédé de fabrication d'un document de valeur et d'un élément de sécurité, document de valeur et élément de sécurité ainsi obtenus et dispositif d'exécution du procédé

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Publication number Publication date
EP3124285A1 (fr) 2017-02-01
DE102015009786A1 (de) 2017-02-02

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