EP3513972B1 - Plaque d'estampage flexible pour une presse à feuilles de l'impression de sécurité - Google Patents

Plaque d'estampage flexible pour une presse à feuilles de l'impression de sécurité Download PDF

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Publication number
EP3513972B1
EP3513972B1 EP19156584.5A EP19156584A EP3513972B1 EP 3513972 B1 EP3513972 B1 EP 3513972B1 EP 19156584 A EP19156584 A EP 19156584A EP 3513972 B1 EP3513972 B1 EP 3513972B1
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EP
European Patent Office
Prior art keywords
embossing
plate
printing
embossing plate
sheet
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
EP19156584.5A
Other languages
German (de)
English (en)
Other versions
EP3513972A1 (fr
Inventor
Max Voit
Peter Franz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giesecke and Devrient Currency Technology GmbH
Original Assignee
Giesecke and Devrient Currency Technology GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Giesecke and Devrient Currency Technology GmbH filed Critical Giesecke and Devrient Currency Technology GmbH
Publication of EP3513972A1 publication Critical patent/EP3513972A1/fr
Application granted granted Critical
Publication of EP3513972B1 publication Critical patent/EP3513972B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F21/00—Devices for conveying sheets through printing apparatus or machines
    • B41F21/08—Combinations of endless conveyors and grippers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F19/00—Apparatus or machines for carrying out printing operations combined with other operations
    • B41F19/02—Apparatus or machines for carrying out printing operations combined with other operations with 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
    • 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

Definitions

  • the invention relates generally to the production of security elements with an optically variable structure which consists of a coating with a repeating pattern and a finely structured embossing that is matched to the coating.
  • the invention relates in particular to a flexible embossing plate for a sheet-fed printing machine for printing and embossing printed sheets to produce security elements with an optically variable structure, and to a method for producing such an embossing plate.
  • Documents of value such as banknotes, shares, bonds, certificates, vouchers, checks, high-quality admission tickets, but also other papers at risk of forgery, such as passports or other identification documents, are often equipped with security elements for protection that both recognize a document of value and check the Allow authenticity of the document of value and at the same time serve as protection against unauthorized reproduction.
  • security elements are used that are machine-readable on the one hand, but can also be checked with simple aids or without any aids on the other.
  • Particularly suitable are security elements that can be identified and recognized as genuine by users without tools and even in poor lighting conditions. Embossing and haptic features that use both the visual appearance and the tactility of the security features are particularly suitable here.
  • Such security elements are used, for example, to protect high-quality pharmaceutical products.
  • the applicant's PEAK® feature which represents a three-dimensional security element that is produced exclusively by printing and embossing paper or the cardboard substrate of a packaging, has proven itself. Filigree optical and tactile elements interlock and create a three-dimensional image that changes depending on the viewing angle.
  • the production of such security elements is, however, comparatively cost-intensive since several process steps are required and the printing and embossing processes are decoupled from one another.
  • a line intaglio printing step is typically required to produce the filigree fine embossing structures, which cannot achieve the desired printing speed for mass production.
  • the pamphlet EP 1 629 994 A2 An embossing plate for a hot-cold lamination press with a three-dimensional structure based on a largely defect-free, surface-hard metal sheet of suitable thickness and dimensions and a suitable surface is known.
  • the pamphlet WO 94/05501 A1 relates to an embossing system for simultaneous positive and negative embossing of a character in sheet material, which includes an upper plate and a lower plate with positive and negative embossing, respectively, on plate sections which are aligned and complementarily arranged so that during the embossing step the neutral sections of the plates do not have any Apply pressure to the sheet material.
  • the invention is based on the object of specifying devices and methods which allow security elements with an optically variable structure from a coating with a repeating pattern and a finely structured one that is matched to the coating Embossing can be produced inexpensively and at high processing speeds.
  • an embossing plate provided with a flexible, finely structured embossing plate forms in the embossing unit of the sheet-fed printing machine Embossing cylinder and an impression cylinder a transfer gap through which the printed sheet is fed and provided with the finely structured embossing structure.
  • the print sheet can be provided with a single-color or with a multicolored, for example two, three or four-color coating, for which purpose the print sheet can be fed through two or more printing units.
  • the number of colors can easily be up to 7.
  • the printing inks can be applied adjacent, superimposed or also spaced from one another. Effect colors, such as metallic luster colors, fluorescent colors, colors with machine-readable features such as magnetic colors, infrared-absorbing or infrared-transparent printing inks, can also be used and combined with conventional printing inks. Such effect colors can also give the security element additional machine-readable properties.
  • the coating can represent a pattern that is repeated in one or two spatial directions and can consist of linear or non-linear basic elements arranged in a grid-like manner.
  • Linear basic elements can run straight or curved, in particular wavy.
  • the line widths of linear basic elements are advantageously between 20 ⁇ m and 700 ⁇ m, preferably between 30 ⁇ m and 300 ⁇ m and particularly preferably between 50 ⁇ m and 200 ⁇ m.
  • Non-linear basic elements can in particular have a round, oval or polygonally delimited outline shape.
  • Non-linear basic elements advantageously have an extension between 20 ⁇ m and 1000 ⁇ m, preferably between 30 ⁇ m and 500 ⁇ m and particularly preferably between 50 ⁇ m and 400 ⁇ m.
  • the finely structured embossed structure is matched to the repeating pattern of the coating, so that the embossed structure and the coating, when matched to one another, form the desired optically variable structure of the security element to be produced.
  • the embossed structure therefore also advantageously consists of linear or non-linear relief elements that are repeated in the same one- or two-dimensional grid as the basic elements of the coating. Examples of combinations of coating and embossing which can advantageously be used within the scope of the invention can be found in the publications WO 97/17211 A1 , WO 2002/20280 A1 , WO 2004/022355 A2 , WO 2006/018232 A2 and WO 2007/093300 A1 are taken, the disclosure content of which is included in the present application.
  • the printed sheet is first provided with the coating and then with the finely structured embossed structure, but it is basically also possible to provide the printed sheet first with the finely structured embossed structure and only then with the coating.
  • a compulsory register is created which ensures that the coating produced in the at least one printing unit and the finely structured embossing structure produced in the embossing unit are produced in a matched manner on the printing sheet. Thanks to the guidance in the gripper closure, even very thin papers can be printed and embossed without damaging the paper.
  • a sheet-fed printing machine in particular a sheet-fed offset printing machine
  • the construction of offset printing machines in particular in series construction enables register-compatible printing with high register-embossing requirements. Due to the very flexible handling of the printing units, it is possible to react quickly in the process to necessary requirements for the color + embossing register.
  • substrates made from natural fibers, cotton, cellulose and waste paper are suitable as printing materials.
  • Composite materials or pure plastics that are suitable for permanently preserving the embossing can also be used.
  • the substrate thickness is advantageously between 0.03 mm and 1.5 mm, preferably between 0.04 mm and 0.5 mm, and particularly preferably between 0.05 mm and 0.4 mm.
  • the weight per unit area of the paper is in particular between 40 g / m 2 and 600 g / m 2 , preferably between 50 g / m 2 and 220 g / m 2 , and particularly preferably between 60 g / m 2 and 150 g / m 2 . m 2 .
  • an embossing cylinder and an impression cylinder advantageously form a transfer gap for carrying out and embossing the printed sheets, the embossing cylinder being provided with a flexible, finely structured embossing plate.
  • An embossing plate of the type described in more detail below is used with particular advantage.
  • the impression cylinder is provided with a soft embossing pad, in particular a soft latex cloth, in the embossing area. Outside of the embossing pad, the impression cylinder is advantageously protected from mechanical influences by a protective film.
  • the present invention relates to a flexible embossing plate according to claim 1, in particular a flexible embossing plate for a sheet-fed printing machine of the type described above, with a plate carrier and a plateau which is raised relative to the surface of the plate carrier and is provided with a finely structured relief structure.
  • the embossing plate is advantageously made of brass, nickel or polymer, particularly advantageously made of spring steel.
  • the finely structured relief structure contains linear or non-linear relief elements.
  • Linear relief elements (engraved lines) can run straight or curved, in particular wavy.
  • Non-linear relief elements can in particular be pyramid-shaped and / or circular-spherical.
  • the relief elements are in a one- or two-dimensional Repeated grid, especially in the same grid as the basic elements of the coating.
  • the finely structured relief structure of the embossing plate has structure depths between 20 ⁇ m and 250 ⁇ m, preferably between 40 ⁇ m and 150 ⁇ m, particularly preferably between 60 ⁇ m and 120 ⁇ m.
  • the structure widths of the relief structure are between 20 ⁇ m and 1500 ⁇ m, preferably between 40 ⁇ m and 1000 ⁇ m, particularly preferably between 60 ⁇ m and 500 ⁇ m.
  • the aspect ratio that is to say the ratio of the structure width to the structure depth of the finely structured relief structure, is advantageously between 1: 1 and 10: 1, preferably between 1.5: 1 and 3.5: 1.
  • the plate carrier of the embossing plate therefore advantageously has a thickness between 50 ⁇ m and 800 ⁇ m, preferably between 80 ⁇ m and 500 ⁇ m, particularly preferably between 100 ⁇ m and 250 ⁇ m.
  • Said raised plateau has a height between 200 ⁇ m and 1000 ⁇ m, preferably between 300 ⁇ m and 750 ⁇ m, particularly preferably between 400 ⁇ m and 600 ⁇ m. Laterally, the plateau advantageously has dimensions of up to 25 mm ⁇ 25 mm.
  • the invention finally also includes a method for producing a flexible embossing plate of the type described above according to claim 7, in which a base plate, namely a spring steel plate, is provided, the base plate is etched to form a plate carrier with a raised plateau, and the plateau is through Milling or exposure to laser radiation is provided with a finely structured relief structure.
  • Milling can be done, for example, with a graver at an angle of about 40 °, so that an engraving depth of 50% of the engraving width results. If the relief structure is created by the action of laser radiation, the ratio of engraving depth to engraving width can be selected as desired over a wide range.
  • FIG. 1 shows schematically an instruction leaflet 10 for a medicament, which, in addition to the usual content information 12 for authenticity assurance, is provided with an embossed security element 14 with a two-colored, optically variable structure.
  • Fig. 2 shows the optically variable structure 20 of the security element 14 in more detail in plan view (upper part of the image) and in cross section (lower part of the image) to explain the basic structure of security elements produced with the aid of the embossing plate according to the invention.
  • the optically variable structure 20 contains, on the one hand, a two-colored coating 22 of the paper substrate 24 of the instruction leaflet 10, which is formed in the form of a repeating line pattern from two different colored parallel lines 22-1, 22-2.
  • the lines 22-1 can for example be printed with red, the lines 22-2 with black printing ink.
  • the two-tone coating 22 is combined with a finely structured embossed structure 26, which is embossed into the paper substrate 24 in the form of parallel embossed lines 28.
  • the coating 22 and the embossed structure 26 are matched to one another in such a way that the red lines 22-1 lie on the left flanks of the embossed lines 28 in the figure and the black lines 22-2 on the right flanks of the embossed lines 28.
  • the coating 22 and the embossed structure 26 together show an optically variable appearance in which when viewed from the left side 30 essentially only the red lines 22-1 of the coating are visible and when viewed from the right side 32 essentially only black lines 22-2 are visible are.
  • the red and black lines 22-1, 22-2 can each fill in the inside of a picture motif, so that when tilting back and forth, not only a color change occurs, but also a change of motif.
  • the above-described optically variable appearance of the security element 14 results from the coincidence of the period lengths of the line pattern and the embossed structure and the exact registration of the two structures.
  • the paper substrate 24 of the instruction leaflet 10 has a small thickness of only about 60 ⁇ m, so that homogeneous embossing 26 of the thin paper without damaging the paper is not without problems in conventional production.
  • the security element 14 is therefore produced in a sheet-fed printing machine, which is described in more detail below, using a specially designed flexible embossing plate.
  • Fig. 3 shows schematically the structure of a sheet-fed printing machine 40 with a feeder 42 for sheet feeding, two printing units 44-1 and 44-2 for printing a first and a second color on a supplied printing sheet 50, an embossing unit 46 for producing a finely structured embossing on the printed printing sheet 50 , and a delivery 48 for stacking the printed and embossed printed sheets 50.
  • the printed sheets 50 are guided within the sheet-fed printing machine 40 by means of conveyor systems on rotating gripper systems in the gripper connection through the two printing units 44-1, 44-2 and the embossing unit 46.
  • a print sheet 50 is printed in the first printing unit 44-1 with a first printing ink, for example red printing ink, and is printed in the second printing unit 44-2 with a second printing ink, for example black printing ink, thereby producing the two-tone coating 22.
  • the printed sheet 50 is fed from the second printing unit 44-2 into the embossing unit 46, where it is provided with the finely structured embossing 26 with precise registration due to the forced register by the gripper closure.
  • the embossing unit 46 of the sheet-fed printing press 40 is shown in FIG Fig. 4 shown schematically in more detail.
  • the embossing unit 46 is a modified offset printing unit of the sheet-fed printing press 40, for example a modified coating unit with an ink fountain 60, inking unit 62, dampening unit 64, a printing plate cylinder 66, an embossing cylinder 68 in the form of a modified blanket cylinder and a modified impression cylinder 72.
  • the original blanket cylinder of the coating unit was modified in that instead of the rubber blanket, a flexible, finely structured embossing plate 70 was stretched around the cylinder 68.
  • the embossing plate 70 contains a finely structured relief structure for producing the desired embossing structure 26 and is described in more detail below.
  • the impression cylinder 72 of the offset printing unit was also modified to form the embossing mechanism 46 by gluing a protective film 74 onto the impression cylinder 72, which is replaced in the embossing area by a soft embossing pad in the form of a glued-on soft latex cloth 76.
  • the embossing cylinder 68 and the impression cylinder 72 form a transfer gap 78 through which the printed sheets 50 are guided and thereby provided with the finely structured embossing 26.
  • Fig. 5 shows the embossing plate 70 according to the invention clamped onto the embossing cylinder 68 in more detail.
  • the plateau 82 can be produced, for example, by etching an initially 610 ⁇ m thick spring steel plate.
  • a finely structured relief structure 84 which corresponds to the negative shape of the desired embossed structure 26, is produced in the plateau 82 by the action of laser radiation.
  • the relief structure 84 consists of a plurality of parallel engraved lines 86 with a period (structure width) of 200 ⁇ m.

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  • Printing Methods (AREA)
  • Credit Cards Or The Like (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)

Claims (7)

  1. Plaque de gaufrage souple (70) pour machine d'impression de feuilles (50) servant à imprimer et à gaufrer des feuilles d'impression pour fabriquer des éléments de sécurité dotés d'une structure optiquement variable, la plaque de gaufrage souple (70) étant réalisée avec un support de plaque (80) et un plateau (82) surélevé par rapport à la surface du support de plaque et d'une hauteur comprise entre 200 µm et 1000 µm et qui est pourvu d'une structure en relief finement structurée (84) qui présente des profondeurs de structure de 20 µm à 250 µm et des largeurs de structure de 20 µm à 1500 µm, et qui contient les éléments en relief de forme linéaire ou de forme non linéaire (86) qui sont disposés de manière répétitive dans une trame mono ou bidimensionnelle.
  2. Plaque de gaufrage souple (70) selon la revendication 1, caractérisée en ce que la structure en relief finement structurée (84) présente des profondeurs de structure de 40 µm à 150 µm, de préférence de 60 µm à 120 µm et/ou des largeurs de structure de 40 µm à 1000 µm, de préférence de 60 µm à 500 µm.
  3. Plaque de gaufrage souple (70) selon la revendication 1 ou 2, caractérisée en ce que le rapport d'aspect entre la largeur de structure et la profondeur de structure de la structure en relief finement structurée (84) est de 1:1 et 10:1, de préférence 1,5:1 et 3,5:1.
  4. Plaque de gaufrage souple (70) selon une des revendications 1 à 3, caractérisée en ce que le support de plaque (80) présente une épaisseur de 50 µm à 800 µm, de préférence de 80 µm à 500 µm, très préférentiellement de 100 µm à 250 µm.
  5. Plaque de gaufrage souple (70) selon une des revendications 1 à 4, caractérisée en ce que le plateau surélevé (82) présente une hauteur de 300 µm à 750 µm, de préférence de 400 µm à 600 µm.
  6. Plaque de gaufrage souple (70) selon une des revendications 1 à 5, caractérisée en ce que les éléments en relief de forme linéaire (86) ont une orientation rectiligne ou courbée, en particulier ondulée, et/ou les éléments en relief de forme non linéaire ont une conformation de forme pyramidale et/ou hémisphérique.
  7. Plaque de gaufrage souple (70) selon une des revendications 1 à 6, dans laquelle est mise à disposition une plaque en acier à ressort, que la plaque en acier en ressort est attaquée pour constituer un support de plaque (80) doté d'un plateau surélevé (82) ayant une hauteur de 200 µm à 1000 µm, et que le plateau (82) est pourvu par fraisage ou action d'un rayonnement laser d'une structure en relief finement structurée (84) qui présente des profondeurs de structure de 20 µm à 250 µm et des largeurs de structure de 20 µm à 1500 µm, et qui contient les éléments en relief de forme linéaire ou de forme non linéaire (86) qui sont disposés de manière répétitive dans une trame mono- ou bidimensionnelle.
EP19156584.5A 2015-09-11 2016-09-09 Plaque d'estampage flexible pour une presse à feuilles de l'impression de sécurité Active EP3513972B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102015011918.4A DE102015011918A1 (de) 2015-09-11 2015-09-11 Einrichtungen und Verfahren zur Herstellung eines Sicherheitselements mit einer optisch variablen Struktur
PCT/EP2016/001524 WO2017041896A2 (fr) 2015-09-11 2016-09-09 Dispositifs et procédé pour produire un élément de sécurité comportant une structure optiquement variable
EP16763199.3A EP3365175B1 (fr) 2015-09-11 2016-09-09 Dispositifs et procédé pour produire un élément de sécurité comportant une structure optiquement variable

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP16763199.3A Division-Into EP3365175B1 (fr) 2015-09-11 2016-09-09 Dispositifs et procédé pour produire un élément de sécurité comportant une structure optiquement variable
EP16763199.3A Division EP3365175B1 (fr) 2015-09-11 2016-09-09 Dispositifs et procédé pour produire un élément de sécurité comportant une structure optiquement variable

Publications (2)

Publication Number Publication Date
EP3513972A1 EP3513972A1 (fr) 2019-07-24
EP3513972B1 true EP3513972B1 (fr) 2020-11-11

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP19156584.5A Active EP3513972B1 (fr) 2015-09-11 2016-09-09 Plaque d'estampage flexible pour une presse à feuilles de l'impression de sécurité
EP16763199.3A Active EP3365175B1 (fr) 2015-09-11 2016-09-09 Dispositifs et procédé pour produire un élément de sécurité comportant une structure optiquement variable

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP16763199.3A Active EP3365175B1 (fr) 2015-09-11 2016-09-09 Dispositifs et procédé pour produire un élément de sécurité comportant une structure optiquement variable

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EP (2) EP3513972B1 (fr)
DE (1) DE102015011918A1 (fr)
WO (1) WO2017041896A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230146365A1 (en) * 2020-03-26 2023-05-11 Toray Industries, Inc. Printed material producing method and printed material

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Publication number Priority date Publication date Assignee Title
US5193458A (en) * 1992-06-23 1993-03-16 Keller James J Gripper bar conveyor for multiple color offset rotary printing press
WO1994005501A1 (fr) * 1992-09-09 1994-03-17 Hilglade Pty. Ltd. Systeme de frappe auto-encreur
DE19541064A1 (de) 1995-11-03 1997-05-07 Giesecke & Devrient Gmbh Datenträger mit einem optisch variablen Element
DE19826974C2 (de) * 1998-06-18 2002-06-20 Roland Man Druckmasch Prägevorrichtung
DE10044465A1 (de) 2000-09-08 2002-03-21 Giesecke & Devrient Gmbh Datenträger mit einem optisch variablen Element
EP1534535B1 (fr) 2002-08-13 2010-06-09 Giesecke & Devrient GmbH Support de donnees element optiquement variable
DE102005011612A1 (de) 2004-08-13 2006-02-23 Giesecke & Devrient Gmbh Datenträger mit einer optisch variablen Struktur
DE102004041434B4 (de) * 2004-08-27 2013-10-10 Credit Card Supplies Verfahren zur Herstellung eines Prägeblechs für eine Heiß-Kalt-Laminierpresse mit dreidimensionalen Strukturen
DE102006006501A1 (de) 2006-02-13 2007-08-16 Giesecke & Devrient Gmbh Sicherheitselement mit einer optisch variablen Struktur
DE102008013322A1 (de) * 2007-03-30 2008-10-02 Heidelberger Druckmaschinen Ag Druckwerk einer Bedruckstoff verarbeitenden Maschine
PL2848424T3 (pl) * 2013-09-13 2020-05-18 Hueck Rheinische Gmbh Sposób wytwarzania struktury powierzchniowej na narzędziu do wytłaczania poprzez nanoszenie powłok metalowych

Non-Patent Citations (1)

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Also Published As

Publication number Publication date
DE102015011918A1 (de) 2017-03-16
WO2017041896A2 (fr) 2017-03-16
WO2017041896A3 (fr) 2017-08-24
EP3365175A2 (fr) 2018-08-29
EP3365175B1 (fr) 2019-11-27
EP3513972A1 (fr) 2019-07-24

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