EP1467871B1 - Steel gravure method for the production of a security document, steel gravure plate and intermediate product for the same and method for production thereof - Google Patents
Steel gravure method for the production of a security document, steel gravure plate and intermediate product for the same and method for production thereof Download PDFInfo
- Publication number
- EP1467871B1 EP1467871B1 EP03702402A EP03702402A EP1467871B1 EP 1467871 B1 EP1467871 B1 EP 1467871B1 EP 03702402 A EP03702402 A EP 03702402A EP 03702402 A EP03702402 A EP 03702402A EP 1467871 B1 EP1467871 B1 EP 1467871B1
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- EP
- European Patent Office
- Prior art keywords
- printing plate
- structures
- embossed
- microns
- producing
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/24—Inking and printing with a printer's forme combined with embossing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C1/00—Forme preparation
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
- B41N1/00—Printing plates or foils; Materials therefor
- B41N1/04—Printing plates or foils; Materials therefor metallic
- B41N1/06—Printing plates or foils; Materials therefor metallic for relief printing or intaglio printing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
- B42D25/29—Securities; Bank notes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C1/00—Forme preparation
- B41C1/02—Engraving; Heads therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S101/00—Printing
- Y10S101/43—Machines printing by both intaglio and another type of printing means
Definitions
- the invention relates to a method for producing a security document, in particular a security such as banknote, check and the like, with a printed image applied by the steel gravure process and with an embossed microstructure region whose structures are on the order of less than 100 ⁇ m.
- the invention further relates to tools suitable for the manufacturing process, namely steel gravure printing plates, and to the production thereof, including semi-finished products, namely originals and intermediate molds for the production of the steel gravure printing plates and the security documents produced therewith.
- the steel gravure corresponds to intaglio printing, whereby the printing plate is made of steel. As a result, a longer service life of the printing plate is achieved and allows for the securities and in particular the banknote printing required high volumes.
- Blind embossing is sometimes produced together with the steel gravure image in a common printing process using a single, partially inked steel gravure plate.
- the paper is pressed into the recesses of the blind embossing areas and in this way permanently deformed.
- the blind embossed areas of the printing plate are not filled with ink unlike the image areas, so that the substrate material of the security document in these areas only sustainably deformed, that is embossed, ( WO 97/48555 ; DE-A-198 45 552 ).
- a security document from a substrate comprises both printed indicia and a section of transparent plastic.
- the latter has an embossed image which may contain a matrix of lines, dots or embossed structure.
- Such a security document is produced by means of a gravure printing plate which, in addition to engraved gravure structures, has a plurality of embossing plates arranged at intervals in the peripheral surface of a printing cylinder.
- a gravure printing method for printing contiguous color areas of different ink layer thickness is known.
- a first and a second color surface are directly adjacent to one another and are separated from one another by a sharp boundary line which is invisible to the naked eye when viewed.
- This boundary line is generated by a separating edge between the two engraving areas of the corresponding printing plate, the upper edge of which tapers to the level of the printing plate surface.
- the engraving areas may in this case be formed flat or have a roughness pattern for better adhesion of the printing ink.
- blind embossing When looking at blind embossing, there are special three-dimensional visual impressions due to light and shadow effects. In addition, blind embossing with corresponding dimensions can also be detected tactilely.
- the structures for the steel gravure image and for the blind embossings are usually introduced into the printing plate surface by means of a stylus, laser or by etching. Regardless of the deployment technique used, these structures will also be referred to generally below as “engravings".
- engravings the fineness of the structures is limited, on the one hand by the engraving techniques themselves, but on the other hand also by the fact that particularly fine structures, the mechanical influences of the wiping cylinder, wiped with the excess ink from the partially inked printing plate, not withstand in the long run.
- embossed structures Due to the slightly iridescent movement and the friction, which prevails at a corresponding contact pressure of the wiper cylinder, embossed structures are on the order of significantly less than 100 microns (hereinafter referred to as "microstructures") damaged in no time. Accordingly, embossments having microstructures significantly smaller than 100 ⁇ m are produced to produce special optical effects in an embossing process performed separately from the printing operation for applying the steel gravure image.
- optical diffraction structures such as holograms and gratings.
- the order of magnitude of these diffraction structures is in the wavelength range of visible light, ie less than 1 ⁇ m.
- embossed diffraction structures and as a last procedural step to print the paper, for example by means of steel gravure printing.
- embossed microstructures in a security document be it as a blind embossing in the substrate material itself or as a diffractive relief structure in a specially provided lacquer layer, thus requires a separate working step in addition to the printing process for producing the steel gravure image.
- the object of the present invention is to propose a method for producing a security document, with which steel gravure images and embossed microstructures can be produced more easily.
- a further object is to propose tools for carrying out the method and a method for producing these tools and their semi-finished products.
- the steel gravure image and the embossed microstructures are produced in a common printing process using a common printing plate in which both the print image engraving and the microstructures are present.
- the microstructures face one another the printing plate surface slightly lowered so that they are not detected by the wiper cylinder, but still allow a perfect embossing process.
- the dimension of the retraction of the microstructures depends on the area size of the microstructure area on the one hand and on the compressibility of the wiping cylinder material and the wiping cylinder contact pressure on the other hand.
- the microstructures should therefore be about 20 .mu.m to 100 .mu.m below the printing plate surface, preferably at least 40 .mu.m and at most 60 .mu.m, these details refer to the components of the microstructures closest to the printing plate surface.
- a square microstructure area should have an area of less than 100 mm 2 to preclude advancement of the wiping cylinder down to the underlying microstructures.
- the dimension of the microstructure area in the direction parallel to the axis of rotation of the wiping cylinder and parallel to the printing plate surface should be less than 10 mm.
- microstructure regions can together form a larger microstructure surface, wherein the individual microstructure regions are separated by webs reaching up to the printing plate surface.
- the webs have on the printing plate surface such a width that they can carry the wiper cylinder, without being permanently damaged by its contact pressure. In this way, an arbitrarily shaped and arbitrarily large area matrix can be generated from smaller microstructure areas.
- the dimensions of the microstructures are preferably of the order of magnitude of between 5 ⁇ m and 100 ⁇ m, if simple blind embossings are to be produced. If, on the other hand, a diffraction-optical relief structure is coined with the microstructures be, for example, in a specially applied to the security document material, optionally metallized coating layer, the order of magnitude of the microstructures in the wave-optical range at and below 1 micron.
- the invention provides a two-stage printing plate production.
- an original printing plate with the print image engraving and on the other hand, one or more dies with the microstructures separately produced in a conventional manner and the original printing plate or a molded thereon Mater is then combined with the original embossing dies or embossing stamp duplicates.
- intermediate forms are first embossed with the original printing plate.
- the microstructure embossing dies also produce a number of duplicates corresponding to the usefulness of the steel gravure printing plate.
- the materials are then combined with the duplicates of the microstructure stamps, for example by juxtaposition and proper bonding. This complex then serves as the actual intermediate form for reshaping one or more duplicate printing plates, which are then used as steel gravure printing plates in the printing units.
- one or more areas are removed from the original printing plate, in which the printed image is engraved, in which the original microstructure embossing stamp (s) are inserted, that the microstructures are below the plate surface.
- the Matern are then formed by the resulting complex.
- a number of mats assembled in the desired utility configuration then form the intermediate mold for the manufacture of the steel gravure printing plates.
- the printing plate can be engraved with the opposite of the ungrav mandat printing plate level lowered Mikrooniage Modellen directly.
- the prerequisite is the use of a Rezisionsgraviervorraum, since standard equipment for the engraving of intaglio printing plates do not have sufficient accuracy to reproducibly produce predetermined structures whose dimensions are smaller than 100 microns. Precision engraving can be achieved both by mechanical, i. machined engraving as well as done by laser engraving.
- the regions provided for the embossing microstructures can first be removed by the value by which the depression is to take place. The microstructures are then inserted into these areas below the level of the unprocessed printing plate surface by precision engraving. In principle, it is also possible first to produce the microstructures in the predetermined desired depth and, if still necessary, subsequently to remove any remaining printing plate material in order to achieve the desired reduction in one area.
- the printing plate original provided with the microstructures can be used directly as a combined printing and embossing plate.
- the original but can also be duplicated with the usual reproduction and impression techniques.
- the intaglio printing plates according to the invention ensure on the securities produced therewith even after long runs even concise embossing structures with high contour sharpness.
- the substrate material for example cotton paper
- the substrate material for example cotton paper
- the lowering of the embossed structures in the printing plate causes in the corresponding region of the processed substrate a non-compressed or at least less compressed region from which the embossed microstructures rise.
- the embossed microstructures can be provided with stabilizing protective layers.
- FIG. 1 shows as one of many possible types of security documents a banknote in plan view with a printed image 1 produced by steel gravure printing and a microstructure embossment 2 likewise produced by steel gravure printing.
- Microstructure embossment 2 can be, for example, a blind embossing in the paper substrate or a diffraction-optical relief structure in one on the Paper substrate applied plastic layer.
- FIG. 2 shows a cross section through the banknote from FIG. 1, the microstructure embossing 2 being in the form of a blind embossing in the surface of the banknote substrate 3.
- the applied by steel gravure printing, the print image 1 forming ink "stands" on the surface of the substrate 3 and is therefore tactile detectable.
- the raised microstructure of the microstructure embossment 2 is, for example, a line grid with a screen ruling in the range from 5 to 100 ⁇ m. Such a structure can be visually perceived as a fine light / shadow pattern and also the surface can optionally be tactilely distinguished from the surrounding unembossed surface.
- FIGS. 3 a to 3 c show an exemplary embodiment in which the microstructure embossing 2 is designed as a diffraction-optical relief structure.
- the structures have a magnitude of about 1 micron or less than 1 micron, that is in the wavelength range of visible light.
- 3a shows the still unprinted bank note substrate 3, which is smoothed in a zone 4, so that an embossing lacquer 5 adheres particularly well to the substrate 3 in this area.
- the embossing lacquer 5 is vapor-deposited with a thin metal layer 6.
- the printed image 1 and on the other hand the diffractive microstructure embossment 2 are applied to the thus prepared substrate 3 in the steel gravure printing method (FIG. 3b).
- the microstructure embossing 2 is covered with a scratch-resistant protective lacquer 7 (FIG. 3c).
- FIG. 4d shows that in the printing plate surface 9 on the one hand there are steel gravure printing structures 10 for producing the printed image 1 and on the other hand microstructures 11 for producing the microstructure embossment 2.
- the microstructures 11 are slightly embedded in the pressure plate surface 9, so that the uppermost microstructure areas, that is, the tips of the microstructure relief lie at a small distance d below the pressure plate surface 9.
- the distance d measures between 20 and 100 ⁇ m, preferably between 40 and 60 ⁇ m.
- the ink is first partially applied in the region of the steel gravure structures 10 on the printing plate surface 9, and by means of a wiping cylinder, not shown, becomes excess Wiped ink from the printing plate surface 9.
- a wiping cylinder not shown
- the substrate of the security document is pressed into the steel gravure structures 10 and into the microstructures 11, whereby on the one hand the ink is taken up from the steel gravure structures 10 and adheres to the substrate surface and on the other hand the substrate is embossed on its surface in the region of the microstructures 11, that is permanently deformed, will.
- the pressures and temperatures of the plate cylinder used in the steel gravure printing process for the production of the printed image are suitable for the embossing of conventional security papers, so that the simultaneous embossing and printing of security paper with a single steel gravure plate is easily possible.
- a typical heating temperature of the plate cylinder is around 80 ° C, but it can also be between 50 and 90 ° C.
- steel intaglio structures 10 are introduced in a conventional manner in an original printing plate O, for example by means of a stylus or in the etching process.
- one or optionally several different dies D with microstructures 11 are also produced in a conventional manner, for example with the same methods that are usually used for the production of diffraction-optical relief structures.
- duplicates of the original printing plate O and the stamp D are produced.
- the production of the duplicate of the original printing plate O, that is the Mater M can be done, for example, by embossing the original printing plate in a plastically deformable plastic, which then forms the Mater M (Cobex embossing). But there are also other Abformungstechniken known and usable.
- a number of mats M 1 , M 2 ..., M n corresponding to the number of uses of the steel gravure printing plate to be produced are produced.
- Also of the die or dies D with the microstructures 11 correspondingly many embossing stamp duplicates DD 1 , DD 2 , ... are produced.
- the molding process of the embossing stamp duplicate DD is preferably carried out by electroforming, in that the microstructure 11 is first rendered electrically conductive and then metallised, for example with copper. The copper layer is then back-cast, such as with tin, to stabilize the structure, and backfilled with lead or plastic to make embossing punch duplicate DD manageable.
- a third step (FIG. 4c), the mats M 1 , M 2 ,... And the embossing die duplicates DD 1 , DD 2 ,... Are arranged side by side and firmly joined together by suitable joining techniques, for example gluing, to form an intermediate shape Z to form.
- a material and embossing punch duplicate pair M 1 , DD 1 or M 2 , DD 2 etc. form a use of the steel gravure printing plate 8 to be produced by means of the intermediate form Z.
- the microstructures described here are present as negative microstructures 11 ', slightly above the impression plane 9' of the intermediate form Z lie.
- the printing plate surface 9 can be hardened by nickel plating, chromium plating in a further production step.
- FIG. 6a An alternative method of manufacturing the printing plate 8 is shown in Figs. 6a to 6e. Accordingly, first the original printing plate O is produced with the intaglio printing structures 10 (FIG. 6a). From the original printing plate O, certain surface areas are subsequently extracted in segments, for example by high-precision milling technology (FIG. 6b). The embossing punch D with the microstructures 11, as shown in FIG. 4 a, is then inserted into the recess 13 thus produced (FIG. 6 c). This requires a precise machining of the embossing die D, so that the microstructures after insertion of the embossing die D in the recess 13 by a defined distance d lower than the surface of the original printing plate O.
- the thus prepared original printing plate O is then used for embossing Matern M ( Fig. 6d), wherein the embossing, for example, takes place again in the coexpression process.
- each Mater M is used for further production of a complete benefit of the steel gravure printing plate 8 to be produced. Therefore, as many Matern M 1 , M 2 , M 3 , ..., of the original printing plate O with embedded embossing stamp D (FIG. made, as the finally to be produced steel gravure plate 8 has benefits.
- the mats M 1 , M 2 , M 3 ,... Are in turn assembled by suitable joining techniques into an intermediate form Z (FIG. 6e), from which the steel gravure printing plate 8 is formed by electroplating.
- the embossing of the original plate of Fig. 6c into a sufficiently large intermediate mold Z may correspond to the number of desired benefits be repeated.
- the step of assembling the individual materials M 1 , M 2 , M 3 ,... To the intermediate form Z is omitted.
- the abovementioned alternative production methods are thus equally suitable for producing positive structures 10, 11 in the finished steel gravure printing plate 8 from the original steel gravure printing structures 10 and original microstructures 11 via "negative structures" 10 ', 11' of the intermediate form Z.
- the manufacturing method described with reference to FIGS. 6a to 6e is preferable in that insertion of microstructures 11 into any position within a printed image 1 by inserting corresponding dies D in recesses 13 of the original printing plate O (FIG. 6c) is easier than the exact assembly of printing plate duplicates or masters M with embossing stamp duplicates DD (FIG. 4c).
- FIGS. 6a to 6e can be produced particularly well by a production method according to FIGS. 6a to 6e.
- a plurality of microstructure embossings 2 form a field of microstructure embossments, in which the individual microstructure embossings 2 are spaced apart from one another.
- These distances 12 ' are a consequence of the fact that the individual microstructure regions 11 of the steel gravure plate 8 must not exceed a maximum size for protection against damage by a wiper cylinder and are therefore separated from one another by separating webs 12 (FIG. 4d).
- These dividers 12 extend to the printing plate surface 9 and have a necessary width to accommodate the pressure of the wiping cylinder can.
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Herstellen eines Sicherheitsdokuments, insbesondere eines Wertpapiers wie Banknote, Scheck und dergleichen, mit einem im Stahltiefdruckverfahren aufgebrachten Druckbild und mit einem geprägten Mikrostrukturbereich, dessen Strukturen in einer Größenordnung von weniger als 100 µm liegen. Die Erfindung betrifft des Weiteren für das Herstellungsverfahren geeignete Werkzeuge, nämlich Stahltiefdruckplatten, und deren Herstellung einschließlich Halbzeugen, nämlich Originale und Zwischenformen für die Herstellung der Stahltiefdruckplatten und die damit hergestellten Sicherheitsdokumente. Der Stahltiefdruck entspricht dem Stichtiefdruck, wobei die Druckplatte aus Stahl gefertigt ist. Dadurch wird eine höhere Standzeit der Druckplatte erreicht und die für den Wertpapier- und insbesondere den Banknotendruck erforderlichen hohen Auflagen ermöglicht.The invention relates to a method for producing a security document, in particular a security such as banknote, check and the like, with a printed image applied by the steel gravure process and with an embossed microstructure region whose structures are on the order of less than 100 μm. The invention further relates to tools suitable for the manufacturing process, namely steel gravure printing plates, and to the production thereof, including semi-finished products, namely originals and intermediate molds for the production of the steel gravure printing plates and the security documents produced therewith. The steel gravure corresponds to intaglio printing, whereby the printing plate is made of steel. As a result, a longer service life of the printing plate is achieved and allows for the securities and in particular the banknote printing required high volumes.
Es ist bekannt, Sicherheitsdokumente zusätzlich zu einem im Stahltiefdruckverfahren aufgebrachten Druckbild mit besonderen Echtheitsmerkmalen auszustatten, von denen für die vorliegende Erfindung insbesondere optisch variable Elemente, wie z.B. geprägte Hologramme oder Gitter (
Blindprägungen werden bisweilen zusammen mit dem Stahltiefdruckbild in einem gemeinsamen Druckvorgang unter Verwendung einer einzigen, partiell eingefärbten Stahltiefdruckplatte erzeugt. Beim Druckvorgang wird das Papier in die Vertiefungen der Blindprägungsbereiche hineingepresst und auf diese Weise nachhaltig verformt. Die Blindprägungsbereiche der Druckplatte werden anders als die Druckbildbereiche nicht mit Farbe gefüllt, so dass das Substratmaterial des Sicherheitsdokuments in diesen Bereichen lediglich nachhaltig verformt, das heißt geprägt, wird (
Ein derartiges Verfahren offenbart auch
Aus
Bei der Betrachtung von Blindprägungen ergeben sich aufgrund von Licht- und Schatteneffekten besondere dreidimensionale optische Eindrücke. Darüber hinaus lassen sich Blindprägungen mit entsprechenden Abmessungen auch taktil leicht erfassen.When looking at blind embossing, there are special three-dimensional visual impressions due to light and shadow effects. In addition, blind embossing with corresponding dimensions can also be detected tactilely.
Die Strukturen für das Stahltiefdruckbild und für die Blindprägungen werden üblicherweise mittels eines Stichels, Lasers oder im Ätzverfahren in die Druckplattenoberfläche eingebracht. Unabhängig von der verwendeten Einbringungstechnik werden diese Strukturen nachfolgend auch allgemein als "Gravuren" bezeichnet. Die Feinheit der Strukturen ist allerdings begrenzt, einerseits durch die eingesetzten Graviertechniken selbst, andererseits aber auch dadurch, dass besonders feine Strukturen den mechanischen Einflüssen des Wischzylinders, mit dem überschüssige Druckfarbe von der partiell eingefärbten Druckplatte abgewischt wird, auf Dauer nicht standhalten. Durch die leicht changierende Bewegung und die Friktion, die bei einem entsprechenden Anpressdruck des Wischzylinders vorherrscht, sind Prägestrukturen mit einer Größenordnung von deutlich weniger als 100 µm (nachfolgend als "Mikrostrukturen" bezeichnet) in kürzester Zeit beschädigt. Dementsprechend werden Prägungen mit Mikrostrukturen deutlich kleiner 100 µm zur Erzeugung besonderer optischer Effekte in einem von dem Druckvorgang zur Aufbringung des Stahltiefdruckbildes getrennt durchgeführten Prägevorgang erzeugt.The structures for the steel gravure image and for the blind embossings are usually introduced into the printing plate surface by means of a stylus, laser or by etching. Regardless of the deployment technique used, these structures will also be referred to generally below as "engravings". However, the fineness of the structures is limited, on the one hand by the engraving techniques themselves, but on the other hand also by the fact that particularly fine structures, the mechanical influences of the wiping cylinder, wiped with the excess ink from the partially inked printing plate, not withstand in the long run. Due to the slightly iridescent movement and the friction, which prevails at a corresponding contact pressure of the wiper cylinder, embossed structures are on the order of significantly less than 100 microns (hereinafter referred to as "microstructures") damaged in no time. Accordingly, embossments having microstructures significantly smaller than 100 μm are produced to produce special optical effects in an embossing process performed separately from the printing operation for applying the steel gravure image.
Entsprechendes gilt für die Aufbringung von optischen Beugungsstrukturen, wie Hologrammen und Gittern. Die Größenordnung dieser Beugungsstrukturen liegt im Wellenlängenbereich des sichtbaren Lichts, also unter 1 µm. In der
Das Erzeugen von geprägten Mikrostrukturen in einem Sicherheitsdokument, sei es als Blindprägung im Substratmaterial selbst oder als beugungsoptische Reliefstruktur in einer dafür speziell vorgesehenen Lackschicht, bedingt somit einen separaten Arbeitsschritt zusätzlich zu dem Druckvorgang zur Erzeugung des Stahltiefdruckbildes.The production of embossed microstructures in a security document, be it as a blind embossing in the substrate material itself or as a diffractive relief structure in a specially provided lacquer layer, thus requires a separate working step in addition to the printing process for producing the steel gravure image.
Aufgabe der vorliegenden Erfindung ist es, ein Verfahren zum Herstellen eines Sicherheitsdokuments vorzuschlagen, mit dem Stahltiefdruckbilder und geprägte Mikrostrukturen einfacher erzeugbar sind.The object of the present invention is to propose a method for producing a security document, with which steel gravure images and embossed microstructures can be produced more easily.
Eine weiter gehende Aufgabe besteht darin, Werkzeuge zur Durchführung des Verfahrens sowie ein Verfahren zur Herstellung dieser Werkzeuge und ihrer Halbzeuge vorzuschlagen.A further object is to propose tools for carrying out the method and a method for producing these tools and their semi-finished products.
Diese Aufgaben werden erfindungsgemäß durch die Verfahren und Gegenstände mit den Merkmalen der nebengeordneten Patentansprüche gelöst. In davon abhängigen Ansprüchen sind vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung angegeben.These objects are achieved by the methods and objects having the features of the independent claims. In dependent claims advantageous embodiments and developments of the invention are given.
Dementsprechend werden das Stahltiefdruckbild und die geprägten Mikrostrukturen in einem gemeinsamen Druckvorgang unter Verwendung einer gemeinsamen Druckplatte erzeugt, in der sowohl die Druckbildgravur als auch die Mikrostrukturen vorliegen. Um zu verhindern, dass die Mikrostrukturen durch die Einwirkung eines über die Druckplatte wischenden Wischzylinders beschädigt werden, liegen die Mikrostrukturen gegenüber der Druckplattenoberfläche geringfügig abgesenkt, so dass sie vom Wischzylinder nicht erfasst werden, aber dennoch einen einwandfreien Prägevorgang ermöglichen. Die Dimension der Zurückversetzung der Mikrostrukturen hängt ab von der Flächengröße des Mikrostrukturenbereichs einerseits und von der Kompressibilität des Wischzylindermaterials und dem Wischzylinderanpressdruck andererseits. Die Mikrostrukturen sollten daher etwa 20 µm bis 100 µm unterhalb der Druckplattenoberfläche liegen, vorzugsweise mindestens 40 µm und maximal 60 µm, wobei sich diese Angaben auf die der Druckplattenoberfläche nächstliegenden Bestandteile der Mikrostrukturen beziehen. Ein quadratischer Mikrostrukturenbereich sollte beispielsweise eine Fläche von weniger ais 100 mm2 aufweisen, um ein Vordringen des Wischzylinders bis zu den tiefer liegenden Mikrostrukturen auszuschließen. Oder anders ausgedrückt, die Dimension des Mikrostrukturenbereichs in Richtung parallel zur Rotationsachse des Wischzylinders und parallel zur Druckplattenoberfläche sollte unter 10 mm liegen.Accordingly, the steel gravure image and the embossed microstructures are produced in a common printing process using a common printing plate in which both the print image engraving and the microstructures are present. In order to prevent the microstructures from being damaged by the action of a wiping cylinder wiping across the printing plate, the microstructures face one another the printing plate surface slightly lowered so that they are not detected by the wiper cylinder, but still allow a perfect embossing process. The dimension of the retraction of the microstructures depends on the area size of the microstructure area on the one hand and on the compressibility of the wiping cylinder material and the wiping cylinder contact pressure on the other hand. The microstructures should therefore be about 20 .mu.m to 100 .mu.m below the printing plate surface, preferably at least 40 .mu.m and at most 60 .mu.m, these details refer to the components of the microstructures closest to the printing plate surface. For example, a square microstructure area should have an area of less than 100 mm 2 to preclude advancement of the wiping cylinder down to the underlying microstructures. In other words, the dimension of the microstructure area in the direction parallel to the axis of rotation of the wiping cylinder and parallel to the printing plate surface should be less than 10 mm.
Mehrere Mikrostrukturenbereiche können zusammen eine größere Mikrostrukturfläche bilden, wobei die einzelnen Mikrostrukturbereiche durch bis an die Druckplattenoberfläche reichende Stege getrennt sind. Die Stege besitzen an der Druckplattenoberfläche eine solche Breite, dass sie den Wischzylinder tragen können, ohne auf Dauer durch dessen Anpressdruck beschädigt zu werden. Auf diese Weise lässt sich eine beliebig geformte und beliebig große Flächenmatrix aus kleineren Mikrostrukturbereichen erzeugen.Several microstructure regions can together form a larger microstructure surface, wherein the individual microstructure regions are separated by webs reaching up to the printing plate surface. The webs have on the printing plate surface such a width that they can carry the wiper cylinder, without being permanently damaged by its contact pressure. In this way, an arbitrarily shaped and arbitrarily large area matrix can be generated from smaller microstructure areas.
Die Abmessungen der Mikrostrukturen, d.h. ihre Höhe und/oder laterale Strukturgröße liegen vorzugsweise in einer Größenordnung zwischen 5 µm und 100 µm, wenn einfache Blindprägungen hergestellt werden sollen. Soll dagegen mit den Mikrostrukturen eine beugungsoptische Reliefstruktur geprägt werden, beispielsweise in eine dafür speziell auf dem Sicherheitsdokumentmaterial applizierte, gegebenenfalls metallisierte Lackschicht, so liegt die Größenordnung der Mikrostrukturen im wellenoptischen Bereich bei und unter 1 µm.The dimensions of the microstructures, ie their height and / or lateral structure size, are preferably of the order of magnitude of between 5 μm and 100 μm, if simple blind embossings are to be produced. If, on the other hand, a diffraction-optical relief structure is coined with the microstructures be, for example, in a specially applied to the security document material, optionally metallized coating layer, the order of magnitude of the microstructures in the wave-optical range at and below 1 micron.
Da sich die Mikrostrukturen aufgrund ihrer geringen Dimensionierung mit den üblichen Verfahren zur Herstellung von Gravurplatten, zum Beispiel mittels Stichel, Laser oder durch Ätzen, nicht immer hinreichend exakt erzeugen lassen, sieht die Erfindung eine zweistufige Druckplattenherstellung vor. Dabei wird zunächst einerseits eine Originaldruckplatte mit der Druckbildgravur und andererseits ein oder mehrere Prägestempel mit den Mikrostrukturen in herkömmlicher Weise separat erzeugt und die Originaldruckplatte oder eine daran abgeformte Mater wird mit dem oder den Originalprägestempeln oder Prägestempelduplikaten anschließend kombiniert.Since the microstructures due to their small dimensions with the usual methods for the production of gravure plates, for example by means of stylus, laser or by etching, can not always produce sufficiently accurate, the invention provides a two-stage printing plate production. In this case, on the one hand, an original printing plate with the print image engraving and on the other hand, one or more dies with the microstructures separately produced in a conventional manner and the original printing plate or a molded thereon Mater is then combined with the original embossing dies or embossing stamp duplicates.
Gemäß einer ersten Ausführungsform werden mit der Originaldruckplatte zunächst Zwischenformen, die Mater, geprägt. Es werden so viele Mater geprägt, wie die fertige Stahltiefdruckplatte Nutzen besitzen soll. Auch von den Mikrostrukturprägestempeln werden eine den Nutzen der Stahltiefdruckplatte entsprechende Anzahl von Duplikaten erzeugt. Die Mater werden dann mit den Duplikaten der Mikrostrukturprägestempel kombiniert, beispielsweise durch nebeneinander Anordnen und geeignetes Verbinden. Dieser Komplex dient dann als eigentliche Zwischenform zum Nachformen einer oder mehrerer Duplikat-Druckplatten, die dann als Stahltiefdruckplatten in den Druckwerken eingesetzt werden.According to a first embodiment, intermediate forms, the Mater, are first embossed with the original printing plate. As many mater are shaped as the finished steel gravure plate should have benefits. The microstructure embossing dies also produce a number of duplicates corresponding to the usefulness of the steel gravure printing plate. The materials are then combined with the duplicates of the microstructure stamps, for example by juxtaposition and proper bonding. This complex then serves as the actual intermediate form for reshaping one or more duplicate printing plates, which are then used as steel gravure printing plates in the printing units.
Gemäß einer anderen Ausführungsform werden aus der Originaldruckplatte, in die das Druckbild eingraviert wird, ein oder mehrere Bereiche entfernt, in die der oder die Originalmikrostrukturprägestempel so eingesetzt werden, dass die Mikrostrukturen unterhalb der Plattenoberfläche liegen. Die Matern werden dann von dem daraus entstehenden Komplex gebildet. Eine Anzahl von in der gewünschten Nutzenanordnung zusammengesetzten Matem bildet dann die Zwischenform zur Herstellung der Stahltiefdruckplatten.According to another embodiment, one or more areas are removed from the original printing plate, in which the printed image is engraved, in which the original microstructure embossing stamp (s) are inserted, that the microstructures are below the plate surface. The Matern are then formed by the resulting complex. A number of mats assembled in the desired utility configuration then form the intermediate mold for the manufacture of the steel gravure printing plates.
Außerdem kann die Druckplatte mit den gegenüber dem ungravierten Druckplattenniveau abgesenkten Mikroprägestrukturen auch direkt graviert werden. Voraussetzung ist aber der Einsatz einer Präzisionsgraviervorrichtung, da Standardgeräte für die Gravur von Stichtiefdruckplatten keine ausreichende Genauigkeit besitzen, um damit vorgegebene Strukturen reproduzierbar zu erzeugen, deren Abmessungen kleiner als 100 µm sind. Die Präzisionsgravur kann sowohl durch mechanische, d.h. spanabhebende Gravur als auch durch Lasergravur erfolgen.In addition, the printing plate can be engraved with the opposite of the ungravierten printing plate level lowered Mikroprägestrukturen directly. However, the prerequisite is the use of a Präzisionsgraviervorrichtung, since standard equipment for the engraving of intaglio printing plates do not have sufficient accuracy to reproducibly produce predetermined structures whose dimensions are smaller than 100 microns. Precision engraving can be achieved both by mechanical, i. machined engraving as well as done by laser engraving.
Während die für das Druckbild vorgesehenen, farbaufnehmenden Vertiefungen in üblicher Art und Weise in die Druckplattenoberfläche eingraviert werden können, können die für die prägenden Mikrostrukturen vorgesehenen Bereiche zunächst um den Wert abgetragen werden, um den die Absenkung erfolgen soll. In diese unter dem Niveau der unbearbeiteten Druckplattenoberfläche liegenden Bereiche werden dann durch eine Präzisionsgravur die Mikrostrukturen eingebracht. Grundsätzlich ist es auch möglich, zuerst die Mikrostrukturen in der vorgegebenen Solltiefe zu erzeugen und, sofern noch erforderlich, anschließend eventuell stehen gebliebenes Druckplattenmaterial abzutragen, um in einem Bereich die gewünschte Absenkung zu erreichen.While the ink-receiving depressions provided for the printed image can be engraved in the printing plate surface in the usual way, the regions provided for the embossing microstructures can first be removed by the value by which the depression is to take place. The microstructures are then inserted into these areas below the level of the unprocessed printing plate surface by precision engraving. In principle, it is also possible first to produce the microstructures in the predetermined desired depth and, if still necessary, subsequently to remove any remaining printing plate material in order to achieve the desired reduction in one area.
Das mit den Mikrostrukturen versehene Druckplattenoriginal kann unmittelbar als kombinierte Druck- und Prägeplatte verwendet werden. Das Original kann aber auch mit den üblichen Reproduktions- und Abformtechniken vervielfältigt werden.The printing plate original provided with the microstructures can be used directly as a combined printing and embossing plate. The original but can also be duplicated with the usual reproduction and impression techniques.
Die erfindungsgemäßen Stichtiefdruckplatten gewährleisten auf den damit hergestellten Wertpapieren auch nach hohen Auflagen noch prägnante Prägestrukturen mit hoher Konturenschärfe.The intaglio printing plates according to the invention ensure on the securities produced therewith even after long runs even concise embossing structures with high contour sharpness.
Aufgrund des beim Stichtiefduckverfahren sehr hohen Anpressdrucks wird das Substratmaterial, beispielsweise Baumwollpapier, auch in den unbedruckten oder ungeprägten Bereichen verdichtet und bleibend komprimiert. Die Absenkung der Prägestrukturen in der Druckplatte bewirkt in dem entsprechenden Bereich des bearbeiteten Substrats einen nicht oder zumindest weniger stark komprimierten Bereich, aus dem sich die geprägten Mikrostrukturen erheben. Als Verschleißschutz können die geprägten Mikrostrukturen mit stabilisierenden Schutzschichten versehen werden.Due to the very high pressure applied in the stitch forming process, the substrate material, for example cotton paper, is compacted even in the unprinted or unembossed areas and permanently compressed. The lowering of the embossed structures in the printing plate causes in the corresponding region of the processed substrate a non-compressed or at least less compressed region from which the embossed microstructures rise. As wear protection, the embossed microstructures can be provided with stabilizing protective layers.
Nachfolgend wird die Erfindung beispielhaft anhand der Figuren beschrieben. Darin zeigen:
- Fig.1
- eine Banknote mit einem Stahltiefdruckbild und geprägten Mikrostrukturen,
- Fig. 2
- die Banknote aus Fig.1 im Querschnitt, wobei die Mikrostrukturen als Blindprägung vorliegen,
- Fig. 3a bis 3c
- die Banknote aus Fig.1 im Querschnitt zu unterschiedlichen Herstellungszeitpunkten, wobei die Mikrostrukturen als optisches Beugungsmuster vorliegen,
- Fig. 4a bis 4d
- die einzelnen Schritte zur Herstellung einer erfindungsgemäßen Stahltiefdruckplatte gemäß einer ersten Ausführungsform,
- Fig. 5
- eine Banknote, ähnlich der Banknote aus Fig.1 mit mehreren zueinander beabstandeten Mikrostrukturbereichen, und
- Fig. 6a bis 6e
- die einzelnen Schritte zur Herstellung einer erfindungsgemäßen Stahltiefdruckplatte gemäß einer zweiten Ausführungsform.
- Fig.1
- a banknote with a steel gravure image and embossed microstructures,
- Fig. 2
- the banknote of Figure 1 in cross-section, wherein the microstructures are present as blind embossing,
- Fig. 3a to 3c
- 1 in cross-section at different production times, the microstructures being in the form of an optical diffraction pattern,
- Fig. 4a to 4d
- the individual steps for producing a steel gravure printing plate according to the invention according to a first embodiment,
- Fig. 5
- a bank note, similar to the banknote of Figure 1 with a plurality of spaced microstructure areas, and
- Fig. 6a to 6e
- the individual steps for producing a steel gravure printing plate according to the invention according to a second embodiment.
Fig. 1 zeigt beispielhaft als eine von vielen möglichen Arten von Sicherheitsdokumenten eine Banknote in Draufsicht mit einem im Stahltiefdruckverfahren erzeugten Druckbild 1 und einer ebenfalls im Stahltiefdruckverfahren erzeugten Mikrostrukturprägung 2. Die Mikrostrukturprägung 2 kann beispielsweise eine Blindprägung im Papiersubstrat oder eine beugungsoptische Reliefstruktur in einer auf dem Papiersubstrat aufgebrachten Kunststoffschicht sein.By way of example, FIG. 1 shows as one of many possible types of security documents a banknote in plan view with a printed
Fig. 2 zeigt einen Querschnitt durch die Banknote aus Fig.1, wobei die Mikrostrukturprägung 2 als Blindprägung in der Oberfläche des Banknotensubstrats 3 vorliegt. Die im Stahltiefdruckverfahren aufgebrachte, das Druckbild 1 bildende Druckfarbe "steht" auf der Oberfläche des Substrats 3 und ist daher taktil erfassbar.FIG. 2 shows a cross section through the banknote from FIG. 1, the
Die erhabene Mikrostruktur der Mikrostrukturprägung 2 ist beispielsweise ein Linienraster mit einer Rasterweite im Bereich von 5 bis 100 µm. Eine solche Struktur ist als feines Licht-/Schattenmuster visuell wahrnehmbar und auch die Oberfläche ist von der umgebenden, ungeprägten Oberfläche gegebenenfalls taktil unterscheidbar.The raised microstructure of the
In den Fig. 3a bis 3c ist ein Ausführungsbeispiel gezeigt, bei dem die Mikrostrukturprägung 2 als beugungsoptische Reliefstruktur ausgeführt ist. In diesem Falle besitzen die Strukturen eine Größenordnung von ca. 1 µm oder weniger als 1 µm, das heißt im Wellenlängenbereich des sichtbaren Lichts. Fig. 3a zeigt das noch unbedruckte Banknotensubstrat 3, welches in einer Zone 4 geglättet ist, damit ein Prägelack 5 in diesem Bereich besonders gut auf dem Substrat 3 haftet. Der Prägelack 5 ist mit einer dünnen Metallschicht 6 bedampft. Im nächsten Verfahrensschritt wird auf das so vorbereitete Substrat 3 im Stahltiefdruckverfahren einerseits das Druckbild 1 und andererseits die beugungsoptische Mikrostrukturprägung 2 aufgebracht (Fig. 3b). Anschließend wird die Mikrostrukturprägung 2 mit einem kratzfesten Schutzlack 7 abgedeckt (Fig. 3c).FIGS. 3 a to 3 c show an exemplary embodiment in which the
Das Druckbild 1 und die Mikrostrukturprägung 2 gemäß den Ausführungsbeispielen nach Fig. 2 und Fig. 3a bis 3c werden in einem einzigen Druckvorgang unter Verwendung einer einzigen Druckplatte hergestellt. Dafür geeignete Druckplatten 8 sind beispielhaft in den Fig. 4d und 6e im Querschnitt gezeigt. Fig. 4d ist zu entnehmen, dass in der Druckplattenoberfläche 9 einerseits Stahltiefdruckstrukturen 10 zur Erzeugung des Druckbilds 1 und andererseits Mikrostrukturen 11 zur Erzeugung der Mikrostrukturprägung 2 vorhanden sind. Die Mikrostrukturen 11 sind in die Druckplattenoberfläche 9 geringfügig eingelassen, so dass die obersten Mikrostrukturbereiche, das heißt die Spitzen des Mikrostrukturreliefs, in einem geringen Abstand d unterhalb der Druckplattenoberfläche 9 liegen. Der Abstand d misst zwischen 20 und 100 µm, vorzugsweise zwischen 40 und 60 µm. Für die Herstellung eines Sicherheitsdrucks wird die Druckfarbe zunächst partiell im Bereich der Stahltiefdruckstrukturen 10 auf die Druckplattenoberfläche 9 aufgetragen, und mittels eines nicht dargestellten Wischzylinders wird überschüssige Druckfarbe von der Druckplattenoberfläche 9 abgewischt. Durch die Tieferlegung der Mikrostrukturen 11 wird erreicht, dass der Wischzylinder nicht mit den filigranen Mikrostrukturen 11 in Kontakt kommt und diese nicht beschädigen kann. Im anschließenden Druckvorgang wird das Substrat des Sicherheitsdokuments in die Stahltiefdruckstrukturen 10 und in die Mikrostrukturen 11 hineingepresst, wodurch einerseits die Farbe aus den Stahltiefdruckstrukturen 10 aufgenommen wird und auf der Substratoberfläche haften bleibt und wodurch andererseits das Substrat an seiner Oberfläche im Bereich der Mikrostrukturen 11 geprägt, das heißt dauerhaft verformt, wird.The printed
Die beim Stahltiefdruckverfahren zur Erzeugung des Druckbilds eingesetzten Drücke und Temperaturen des Druckplattenzylinders sind für die Prägung von üblichen Sicherheitspapieren geeignet, so dass das gleichzeitige Prägen und Bedrucken von Sicherheitspapier mit einer einzigen Stahltiefdruckplatte problemlos möglich ist. Eine typische Heiztemperatur der Plattenzylinder liegt bei circa 80°C, sie kann jedoch auch zwischen 50 und 90°C betragen.The pressures and temperatures of the plate cylinder used in the steel gravure printing process for the production of the printed image are suitable for the embossing of conventional security papers, so that the simultaneous embossing and printing of security paper with a single steel gravure plate is easily possible. A typical heating temperature of the plate cylinder is around 80 ° C, but it can also be between 50 and 90 ° C.
Nachfolgend werden anhand der Fig. 4a bis 4d und 6a bis 6e zwei alternative Verfahren zur Herstellung der Druckplatte 8 mit tiefer liegenden Mikrostrukturen 11 beschrieben.In the following, two alternative methods for producing the
In einem ersten Schritt (Fig. 4a) werden einerseits Stahltiefdruckstrukturen 10 auf herkömmliche Weise in einer Originaldruckplatte O eingebracht, beispielsweise also mittels eines Stichels oder im Ätzverfahren. Separat dazu wird ein oder ggf. auch mehrere verschiedene Prägestempel D mit Mikrostrukturen 11 ebenfalls auf herkömmliche Weise erzeugt, beispielsweise also mit denselben Verfahren, die üblicherweise zur Herstellung von beugungsoptischen Reliefstrukturen eingesetzt werden.In a first step (FIG. 4a), on the one hand,
In einem zweiten Schritt (Fig. 4b) werden Duplikate von der Originaldruckplatte O und dem Prägestempel D hergestellt. Die Herstellung des Duplikats der Originaldruckplatte O, das ist die Mater M, kann beispielsweise durch Prägen der Originaldruckplatte in einen plastisch verformbaren Kunststoff erfolgen, der dann die Mater M bildet (Cobex-Prägung). Es sind aber auch andere Abformungstechniken bekannt und verwendbar. Es werden eine der Anzahl der Nutzen der herzustellenden Stahltiefdruckplatte entsprechende Anzahl von Matern M1, M2..., Mn hergestellt. Auch von dem oder den Prägestempeln D mit den Mikrostrukturen 11 werden entsprechend viele Prägestempelduplikate DD1, DD2,... hergestellt. Der Abformungsprozess der Prägestempelduplikate DD erfolgt vorzugsweise galvanoplastisch, indem die Mikrostruktur 11 zunächst elektrisch leitfähig gemacht und dann metallisiert wird, beispielsweise mit Kupfer. Die Kupferschicht wird anschließend hintergossen, beispielsweise mit Zinn, um die Struktur zu stabilisieren, und mit Blei oder Kunststoff hinterfüttert, um das Prägestempelduplikat DD handhabungsfähig zu machen.In a second step (FIG. 4b), duplicates of the original printing plate O and the stamp D are produced. The production of the duplicate of the original printing plate O, that is the Mater M, can be done, for example, by embossing the original printing plate in a plastically deformable plastic, which then forms the Mater M (Cobex embossing). But there are also other Abformungstechniken known and usable. A number of mats M 1 , M 2 ..., M n corresponding to the number of uses of the steel gravure printing plate to be produced are produced. Also of the die or dies D with the
In einem dritten Schritt (Fig. 4c) werden die Matern M1, M2, ... und die Prägestempelduplikate DD1, DD2, ... nebeneinander angeordnet und durch geeignete Verbindungstechniken, beispielsweise Kleben, fest miteinander verbunden, um eine Zwischenform Z zu bilden. In der in Fig. 4c dargestellten Zwischenform Z bilden jeweils ein Mater- und Prägestempelduplikatpaar M1, DD1 bzw. M2, DD2 etc. einen Nutzen der mittels der Zwischenform Z herzustellenden Stahltiefdruckplatte 8. Man erkennt, dass die Mikrostrukturen, die hier als Negativ-Mikrostrukturen 11' vorliegen, geringfügig über der Abformebene 9' der Zwischenform Z liegen.In a third step (FIG. 4c), the mats M 1 , M 2 ,... And the embossing die duplicates DD 1 , DD 2 ,... Are arranged side by side and firmly joined together by suitable joining techniques, for example gluing, to form an intermediate shape Z to form. In the intermediate form Z shown in FIG. 4c, in each case a material and embossing punch duplicate pair M 1 , DD 1 or M 2 , DD 2 etc. form a use of the steel
Das Abformen der Stahltiefdruckplatte 8 von der Zwischenform Z (Fig. 4d) geschieht wiederum galvanoplastisch in entsprechender Weise wie die Duplizierung des Prägestempels D. Zusätzlich kann die Druckplattenoberfläche 9 durch Vernickeln, Verchromen in einem weiteren Herstellungsschritt gehärtet werden.The forming of the steel
Ein alternatives Verfahren zur Herstellung der Druckplatte 8 ist in den Fig. 6a bis 6e gezeigt. Demnach wird zunächst die Originaldruckplatte O mit den Stichtiefdruckstrukturen 10 erzeugt (Fig. 6a). Aus der Originaldruckplatte O werden anschließend bestimmte Flächenbereiche segmentweise extrahiert, beispielsweise durch hochpräzise Frästechnik (Fig. 6b). In die so erzeugte Aussparung 13 wird sodann der Prägestempel D mit den Mikrostrukturen 11, wie er in Fig. 4a gezeigt ist, eingesetzt (Fig. 6c). Das erfordert eine passgenaue Bearbeitung des Prägestempels D, damit die Mikrostrukturen nach dem Einsetzen des Prägestempels D in die Aussparung 13 um einen definierten Abstand d tiefer liegen als die Oberfläche der Originaldruckplatte O. Die so vorbereitete Originaldruckplatte O wird dann zum Prägen von Matern M genutzt (Fig. 6d), wobei die Prägung beispielsweise wieder im Cobexprägeverfahren erfolgt. In diesem Falle dient jede Mater M zur weiteren Herstellung eines vollständigen Nutzen der zu erzeugenden Stahltiefdruckplatte 8. Es werden daher von der Originaldruckplatte O mit eingelagertem Prägestempel D (Fig. 6c) so viele Matern M1, M2, M3, ... hergestellt, wie die endgültig herzustellende Stahltiefdruckplatte 8 Nutzen besitzt. Die Matern M1, M2, M3, ... werden wiederum durch geeignete Verbindungstechniken zusammengesetzt zu einer Zwischenform Z (Fig. 6e), von der die Stahltiefdruckplatte 8 galvanotechnisch abgeformt wird.An alternative method of manufacturing the
Alternativ kann das Einprägen der Originalplatte aus 6c in eine ausreichend große Zwischenform Z entsprechend der Anzahl der gewünschten Nutzen wiederholt werden. In diesem Fall entfällt der Schritt des Zusammenfügens der Einzelmatem M1, M2, M3,... zur Zwischenform Z.Alternatively, the embossing of the original plate of Fig. 6c into a sufficiently large intermediate mold Z may correspond to the number of desired benefits be repeated. In this case, the step of assembling the individual materials M 1 , M 2 , M 3 ,... To the intermediate form Z is omitted.
Die vorgenannten, alternativen Herstellungsverfahren sind somit in gleicher Weise dazu geeignet, aus den Originalstahltiefdruckstrukturen 10 und Originalmikrostrukturen 11 über "Negativstrukturen" 10',11' der Zwischenform Z wiederum Positivstrukturen 10,11 in der fertigen Stahltiefdruckplatte 8 herzustellen. Das in Bezug auf Fig. 6a bis 6e beschriebene Herstellungsverfahren ist insofern zu bevorzugen, als das Einsetzen von Mikrostrukturen 11 an eine beliebige Stelle innerhalb eines Druckbilds 1 durch Einsetzen entsprechender Prägestempel D in Aussparungen 13 der Originaldruckplatte O (Fig. 6c) einfacher ist, als das exakte Zusammensetzen von Druckplattenduplikaten bzw. Matern M mit Prägestempelduplikaten DD (Fig. 4c). Insbesondere lässt sich eine Stahltiefdruckplatte 8 zur Erzeugung eines Druckbilds 1 mit darin integrierten Mikrostrukturprägungen 2, wie in Fig. 5 dargestellt, durch ein Herstellungsverfahren nach Fig. 6a bis 6e besonders gut herstellen. In dem Stahltiefdruckbild 1, welches in Fig. 5 lediglich durch seine äußere Umrandung angedeutet ist, bilden mehrere Mikrostrukturprägungen 2 ein Feld von Mikrostrukturprägungen, bei dem die einzelnen Mikrostrukturprägungen 2 zueinander beabstandet sind. Diese Abstände 12' sind eine Konsequenz daraus, dass die einzelnen Mikrostrukturbereiche 11 der Stahltiefdruckplatte 8 zum Schutz gegen Beschädigung durch einen Wischzylinder eine maximale Größe nicht überschreiten dürfen und daher durch Trennstege 12 voneinander getrennt sind (Fig. 4d). Diese Trennstege 12 reichen bis an die Druckplattenoberfläche 9 und haben eine notwendige Breite, um den Druck des Wischzylinders aufnehmen zu können.The abovementioned alternative production methods are thus equally suitable for producing
Claims (24)
- A steel intaglio printing plate (8) comprising a printing plate surface (9) having at least one first area with steel intaglio structures (10) and at least one second area with embossed structures (11), wherein the embossed structures (11) have a height and/or lateral structural size of less than 100 microns and wherein the parts of the embossed structures (11) closest to the printing plate surface (9) are located at a distance (d) of 20 microns to 100 microns below the printing plate surface (9).
- A mold (Z) for producing steel intaglio printing plates (8) according to claim 1 comprising at least one first segment (M) having negative steel intaglio structures (10') and at least one second segment (DD) different from the first segment (M) and having negative embossed structures (11') having a height and/or lateral structural size of ≤ 100 microns, wherein the mold (Z) has a molding plane (9') and wherein the parts of the negative embossed structures (11') closest to the molding plane (9') are located 20 microns to 100 microns above the molding plane (9').
- A mold (Z) for producing steel intaglio printing plates (8) according to claim 1 comprising at least one segment (M) having negative steel intaglio structures (10') and negative embossed structures (11') having a height and/or lateral structural size of ≤ 100 microns, wherein the mold (Z) has a molding plane (9') and wherein the parts of the negative embossed structures (11') closest to the molding plane (9') are located 20 microns to 100 microns above the molding plane (9').
- An original printing plate for producing a mold according to claim 3 having steel intaglio structures (10) and at least one gap (13) into which an embossing die (D) with embossed structures (11) having a height and/or lateral structural size of ≤ 100 microns, is so inserted that the parts of the embossed structures (11) closest to the surface of the original printing plate (O) are located 20 microns to 100 microns below said surface.
- An object according to any of claims 1 to 4, wherein the embossed structures have a height and/or lateral structural size in the range of 5 to 100 microns.
- The object according to any of claims 1 to 4, wherein the embossed structures (11) are so formed that a diffractive relief structure can be embossed therewith.
- The object according to claim 6, wherein the embossed structures (11) have a height and/or lateral structural size of less than 1 micron.
- The object according to any of claims 1 to 7, wherein the parts of the embossed structures (11) closest to the printing plate surface (9) or molding plane (9') are located at least 40 microns away from the printing plate surface (9) or molding plane (9').
- The object according to any of claims 1 to 8, wherein the parts of the embossed structures (11) closest to the printing plate surface (9) or molding plane (9') are located at most 60 microns away from the printing plate surface (9) or molding plane (9').
- The object according to any of claims 1 to 9, wherein the area of the embossed structures (11) has an area size of less than 400 square millimeters, preferably less than 100 square millimeters.
- The object according to any of claims 1 to 10, wherein a plurality of areas with embossed structures (11) constitute an embossed structure grid.
- The object according to any of claims 1 to 11, wherein the embossed structures (11) are separated from the steel intaglio structures (10) or from another area with embossed structures (11) by a separation bar (12) extending as far as the printing plate surface (9) or molding plane (9') and having a width of at least 0.5 millimeters.
- A method for producing an object according to any of claims 1, 2 or 5 to 12 comprising the following steps:- producing a steel intaglio structure (10) in an original printing plate (O) and producing at least one matrix (M) from the original printing plate (O),- producing an embossing die (D) with embossed structures (11) and producing at least one embossing die duplicate (DD),- producing a mold (Z) with a molding plane (9') by disposing side by side and connecting one or more matrices (M, M 1 , M 2 , ...) and one or more embossing die duplicates (DD, DD 1, DD 2 , ...) so that the parts of the embossed structures closest to the molding plane are located 20 microns to 100 microns above the molding plane (9').
- A method for producing an object according to any of claims 1 or 3 to 12 comprising the following steps:- producing steel intaglio structures (10) in an original printing plate (O),- producing at least one gap in the surface of the original printing plate (O) having the steel intaglio structures (10),- producing an embossing die (D) with embossed structures (11),- inserting the embossing die (D) into the gap (13) such that the parts of the embossed structures (11) closest to the surface of the original printing plate (O) are located 20 microns to 100 microns below said surface.
- The method according to claim 14, wherein a plurality of matrices (M1, M2, ...) are embossed from the original printing plate (O) with the embossing die (D) inserted into the gap (13), said matrices being disposed side by side and connected to constitute a mold (Z).
- The method according to claim 13 or 15, wherein a steel intaglio printing plate (8) is molded from the mold (Z).
- The method according to claim 16, wherein the molding of the steel intaglio printing plate (8) from the mold (Z) is effected by galvanoplasty.
- A method for producing a steel intaglio printing plate according to any of claims 1 or 5 to 12 comprising the following steps:- producing steel intaglio structures (10) in a steel intaglio printing plate (8),- producing embossed structures (11) in the steel intaglio printing plate (8) by engraving such that the parts of the embossed structures (11) closest to the surface of the steel intaglio printing plate (8) are located 20 to 100 microns below said surface.
- The method according to any of claims 14 to 19, wherein the embossed structures (11) have a height and/or lateral structural size of ≤ 100 microns.
- A method for producing a security document by steel intaglio printing using a steel intaglio printing plate according to any of claims 1 and 5 to 12 comprising the steps of:- filling the steel intaglio structures (10) of the steel intaglio printing plate (8) with ink without filling the embossed structures (11) with ink,- printing a security document by means of the steel intaglio printing plate (8) partially filled with ink and embossing the embossed structures in a printing operation while applying a pressure that suffices for transferring the ink from the steel intaglio structures (10) to the security document, on the one hand, and embossing the security document in the area of the embossed structures (11), on the other hand.
- The method according to claim 20, wherein the embossing of the security document in the area of the embossed structures (11) is a blind embossing.
- The method according to claim 20, wherein the security document has an embossable coating (5, 6) and wherein the embossing of the security document is effected in the area of said embossable coating such that diffractive relief structures are embossed into the embossable coating.
- The method according to claim 22, wherein the embossed coating is covered with a transparent protective layer (7).
- A security document having a steel intaglio printed image and a microstructure embossing, produced with an intaglio printing plate according to any of claims 1 or 5 to 12.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10201032 | 2002-01-11 | ||
DE10201032A DE10201032A1 (en) | 2002-01-11 | 2002-01-11 | Steel intaglio printing process for producing a security document, as well as steel intaglio printing plate and semi-finished products therefor, and process for their production |
PCT/EP2003/000112 WO2003057494A1 (en) | 2002-01-11 | 2003-01-08 | Steel gravure method for the production of a security document, steel gravure plate and semi-product for the same and method for production thereof |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1467871A1 EP1467871A1 (en) | 2004-10-20 |
EP1467871B1 true EP1467871B1 (en) | 2007-07-25 |
EP1467871B2 EP1467871B2 (en) | 2014-12-03 |
Family
ID=7712033
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03702402.3A Expired - Lifetime EP1467871B2 (en) | 2002-01-11 | 2003-01-08 | Steel gravure method for the production of a security document, steel gravure plate and intermediate product for the same and method for production thereof |
Country Status (12)
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US (2) | US7213512B2 (en) |
EP (1) | EP1467871B2 (en) |
CN (1) | CN100386214C (en) |
AT (1) | ATE367934T1 (en) |
AU (1) | AU2003205579A1 (en) |
CA (1) | CA2472020C (en) |
DE (2) | DE10201032A1 (en) |
ES (1) | ES2289257T3 (en) |
MY (1) | MY136554A (en) |
PT (1) | PT1467871E (en) |
RU (1) | RU2314209C2 (en) |
WO (1) | WO2003057494A1 (en) |
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-
2002
- 2002-01-11 DE DE10201032A patent/DE10201032A1/en not_active Ceased
-
2003
- 2003-01-08 ES ES03702402T patent/ES2289257T3/en not_active Expired - Lifetime
- 2003-01-08 AT AT03702402T patent/ATE367934T1/en active
- 2003-01-08 PT PT03702402T patent/PT1467871E/en unknown
- 2003-01-08 RU RU2004124522/12A patent/RU2314209C2/en not_active IP Right Cessation
- 2003-01-08 CA CA2472020A patent/CA2472020C/en not_active Expired - Fee Related
- 2003-01-08 US US10/500,924 patent/US7213512B2/en not_active Expired - Fee Related
- 2003-01-08 DE DE50307762T patent/DE50307762D1/en not_active Expired - Lifetime
- 2003-01-08 WO PCT/EP2003/000112 patent/WO2003057494A1/en active IP Right Grant
- 2003-01-08 CN CNB03801579XA patent/CN100386214C/en not_active Expired - Fee Related
- 2003-01-08 AU AU2003205579A patent/AU2003205579A1/en not_active Abandoned
- 2003-01-08 EP EP03702402.3A patent/EP1467871B2/en not_active Expired - Lifetime
- 2003-01-09 MY MYPI20030064A patent/MY136554A/en unknown
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2007
- 2007-05-07 US US11/745,240 patent/US7690300B2/en not_active Expired - Fee Related
Also Published As
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EP1467871A1 (en) | 2004-10-20 |
RU2314209C2 (en) | 2008-01-10 |
CA2472020C (en) | 2010-11-23 |
US20050072326A1 (en) | 2005-04-07 |
CA2472020A1 (en) | 2003-07-17 |
US7213512B2 (en) | 2007-05-08 |
WO2003057494A1 (en) | 2003-07-17 |
CN100386214C (en) | 2008-05-07 |
ATE367934T1 (en) | 2007-08-15 |
EP1467871B2 (en) | 2014-12-03 |
RU2004124522A (en) | 2006-01-20 |
DE50307762D1 (en) | 2007-09-06 |
MY136554A (en) | 2008-10-31 |
US7690300B2 (en) | 2010-04-06 |
PT1467871E (en) | 2007-10-25 |
ES2289257T3 (en) | 2008-02-01 |
US20070283824A1 (en) | 2007-12-13 |
DE10201032A1 (en) | 2003-07-24 |
AU2003205579A1 (en) | 2003-07-24 |
CN1592688A (en) | 2005-03-09 |
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