EP1317349B1 - Gravure printing plate and valuable document produced by the same - Google Patents

Gravure printing plate and valuable document produced by the same Download PDF

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Publication number
EP1317349B1
EP1317349B1 EP01962997A EP01962997A EP1317349B1 EP 1317349 B1 EP1317349 B1 EP 1317349B1 EP 01962997 A EP01962997 A EP 01962997A EP 01962997 A EP01962997 A EP 01962997A EP 1317349 B1 EP1317349 B1 EP 1317349B1
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EP
European Patent Office
Prior art keywords
area
printing plate
engraving
printing
edge area
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.)
Revoked
Application number
EP01962997A
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German (de)
French (fr)
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EP1317349A1 (en
Inventor
Roger Adamczyk
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Giesecke and Devrient GmbH
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Giesecke and Devrient GmbH
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Application filed by Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
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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
    • 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
    • B41M1/10—Intaglio printing ; Gravure printing
    • 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

Definitions

  • the invention relates to a data carrier with intaglio printing Print image, a gravure printing process and printing plates for the Implementation of intaglio printing and a manufacturing process of the printing plates.
  • gravure printing In gravure printing, a distinction is made between screen printing and the Differentiation between engraved and line gravure. With the gravure printing process the production of the printing plates, for example using an electron beam, Laser beam or prick. Characteristic of gravure printing is that different gray or color values of the printed image due to regular wells of different density and size arranged in the pressure plate and / or depth are generated.
  • intaglio printing is linear in the printing plates
  • Wells are introduced to create a printed image.
  • the mechanically manufactured printing plate for intaglio printing is due of the usually tapered engraving tools with increasing Stitch depth creates a wider line.
  • the ink absorption capacity decreases the engraved line and thus the opacity of the printed line with increasing stitch depth.
  • etching intaglio plates the non-printing areas of the printing plate with a chemically inert Lacquer covered. Subsequent etching will result in the exposed Plate surface produces the engraving, the depth of the engraving lines in particular depend on the etching time and line width.
  • Line or intaglio printing technology especially steel intaglio printing technology, provides a characteristic, easily recognizable even for laypersons Print image that is not reproduced with other common printing processes can be.
  • a data carrier printed in intaglio by embossing and ink application a printed image that is perceptible with the sense of touch Relief forms.
  • the intaglio printing technique is therefore preferred for the Printing on data carriers, especially security and security documents, such as banknotes, shares, bonds, certificates, vouchers, Security labels and the like, which have high requirements regarding the Counterfeit protection must be used.
  • a method is known from WO 97/48555 using the intaglio printing plate can be produced in a reproducible, mechanical way.
  • To the lines of a line template are recorded and the area of each Line is determined exactly.
  • an engraving tool for example one rotating stylus or a laser beam, first the outer contour this area is engraved to cleanly frame the area. Subsequently the bordered area of the surface is created using the same or a other engraving tool cleared, so the entire line accordingly the line template is exactly engraved.
  • the object of the present invention is to improve the tactility of the Preserve or improve the printed image, while saving of color without losing the color impression of the printed image compared to one to change the image printed using conventional intaglio printing.
  • the intaglio printing plate according to the invention is characterized by at least an engraved area in the printing plate surface, the engraved Area has one or more structural elements in which the Edge area has a greater engraving depth than the inner area, the The border area and the interior area directly adjoin each other and the interior area as a plateau lowered in relation to the printing plate surface is designed.
  • An engraved in the intaglio printing plate according to the invention The printed image preferably has several such structural elements.
  • the difference in engraving depth between edge areas and interior areas increases the tactility in the print image produced according to the invention, since the relief structure in a print image generated according to the prior art of the printed area is much more complex.
  • the printed area has a groove-shaped profile in cross-section, which when swept is tactile perceptible with the bare finger. Due to the frequent change from The characteristic tactile becomes the tactile perceptible edge area to the inner area The impression of a intaglio printing image is enhanced. With appropriate Dimensions of the engraving areas is the transition from bumps and Wells in the printed image can be clearly felt, so that the different Border or interior areas can be identified individually.
  • the tactility of the printed image is the same or even improved Printing ink saved because only so much color is transferred in the edge area must be felt tactilely. Only so much must be used indoors Color are transferred so that the desired shade is achieved.
  • the inside of the printing plate must therefore be engraved less deeply than the edge areas, so that the color-absorbing volume of the engraved area significantly reduced.
  • printing problems that result from filling larger, particularly deeply engraved areas, like spraying the color out of the engraving area during the printing process or the incomplete transfer of the ink from the engraving on the surface of the substrate to be printed.
  • the cross-sectional profile of the edge area in the pressure plate can have any conceivable shape, but is expediently wedge-shaped or designed trapezoidal.
  • a step-like configuration is also conceivable the edge area, i.e. the edge area itself has different Engraving depths.
  • the edge areas can also be the same or different independently of one another Have shape. For example, can the edge area of a structural element wedge-shaped and another trapezoidal.
  • the geometry of the wedge and trapezoidal shape is not subject to any restrictions, i.e. Side aspect ratios and angles can be unlimited be chosen by a specialist.
  • the interior is lowered compared to the printing plate surface, whereby the cross-sectional profile is designed as a plateau, i.e. the interior forms a plane that is preferably parallel to the printing plate surface is aligned.
  • the interior as an inclined plane in relation to the printing plate surface is present.
  • the surface of the interior can be with a basic roughness pattern be equipped, which serves as an ink catcher for the printing ink. This is with dimensions the interior from a length and width of about 100 microns appropriate. Even with trapezoidal or rectangular edge areas, the one have at least about 100 microns wide and long base area the basic roughness pattern can be incorporated.
  • the basic roughness pattern is, for example, according to the method described in WO 97/48555 created in the engraving of the printing plate at the bottom of the cleared areas.
  • edge area and the interior area meet directly, i.e. they are direct adjacent and not spaced by webs that have pressure plate level. In the later print image, the marginal and inner areas are therefore not separated from each other by blank areas.
  • the depth and width of the engraving of the edge or interior areas of a structural element are chosen by the specialist so that in the later print image the desired width, color layer thickness and the desired color tone corresponding printed structural elements is generated.
  • the engraving depth is the edge area in the range of about 60 ⁇ m to 150 ⁇ m and that of the In NEN range approximately in the range of 10 microns to 120 microns.
  • the engraving depth of the edge region is preferably in the range of 100 ⁇ m up to 150 ⁇ m and that of the interior in the range from 60 ⁇ m to 100 ⁇ m. at These engraving depths are made using commercially available intaglio printing inks Print image reaches an ink layer thickness at which the printing inks already are opaque and no longer have a glaze effect, i.e. one with one accordingly The deeply engraved printing plate has only one color on. This enables a print image to be created that covers the entire area Surface has a uniform color and no contrasting colors, but still has a tactile perceptible edge.
  • the printing inks With engraving depths of less than about 60 ⁇ m, the printing inks have glazing Character in the printed image. You are no longer at these engraving depths opaque, i.e. the color tone in the printed image depends on the ink layer thickness. If you choose these engraving depths, the printed images can be used with a tactile perceptible and color-coded border from the interior become. There is also the option of an opaque edge area to combine with a glazed interior.
  • the engraving depth of an edge area for example in the course an engraved line, continuously or gradually enlarged or be made smaller.
  • the border and interior areas can be independent have the same or different engraving depth from each other.
  • the engraving width of the marginal and inner areas is mainly determined according to the desired print image.
  • the engraving width of the edge area is in the range from 120 ⁇ m to 500 ⁇ m.
  • the engraving width of the inner area results when engraving the structural element inevitably from the engraving width of the structural element, the engraving width of the edge area and the engraving depth of the interior.
  • the structural element can represent any geometric element, e.g. Lines of different widths, preferably with a width up to 3 mm or more, or elements with e.g. circular, triangular or square or asymmetrical outline structure, a symbol, characters or other symbol, with characters in particular alphanumeric Characters are preferred. You can also use multiple structural elements in any Number and shape can be combined. Of course it is too possible with the lines and / or elements printed according to the invention To combine lines and / or elements with other printing techniques, e.g. conventional intaglio printing, offset printing, etc.
  • the intaglio printing plates according to the invention are preferably made by Engraving made with a rapidly rotating, tapering stylus. According to the outline shape of the surface to be printed, through the engraving tool recesses with targeted variation of the engraving depth in introduced the surface of the printing plate and for the printing process Color filled.
  • the printing ink is made from the depressions of the Transfer plate to the surface of a substrate. Of the untreated, i.e. non-engraved surface areas of the printing plate will not Transfer color.
  • this data carrier is characterized by at least a structural element made by intaglio printing and in the border area and inside area different color layer thicknesses exhibit.
  • the border area and the interior area border directly next to each other, with the edge area having a greater layer of color than the interior and the interior as opposed to the Edge area of the lowered plateau is designed.
  • the dimensions of the Color layer areas in the printed image such as width and ink layer thickness, result from the values given above for the engraving depth and width of the invention Printing plate and depending on the printing ink used while printing.
  • transitions between marginal and inner areas as well as the edges and corners of the printed areas can be delimited precisely as in the engraved printing plate.
  • the transitions between edge and inside area as well as the shape of the edges and corners in the The printed image depends on the ink composition used and their viscosity as well as depending on the Printing plate engraving depth more or less fluent.
  • the difference in color thickness leads between edge areas and interior areas for increased tactility of the generated according to the invention
  • Structural element of the printed image as compared to one according to the state the printed image generated the relief structure of the printed area is much more complex.
  • the grooved profile of the printed cross section Areas are tactile better when sweeping with your bare finger imperceptible. With corresponding dimensions of the engraving areas, the Transition of elevations and depressions in the printed image can be clearly felt, so that the different border and interior areas can be identified individually are.
  • the tactility of the printed image is the same or even improved Ink saved because the inner areas use less ink have than the edge areas.
  • the usual intaglio inks or opaque to a certain extent and translucent printed With suitable layer thicknesses and A sensible choice of the color of the surface results in different shades Brightness and color saturation. With sufficiently different Color layer thicknesses arise for the human eye without further notice Aids clearly visible contrasts. Normal lighting conditions and a normal viewing distance is assumed.
  • the color tone in the printed image depends on the ink layer thickness. So that can Depending on the thickness of the ink layer, the print images can be perceived with a tactile and color-coded border from the interior or an opaque border area with a glazed interior be combined.
  • intaglio substrate materials such as paper, Plastic films, paper laminated or coated with plastic films and multilayer composite materials.
  • the invention is particularly suitable Process for printing on data carriers that have high requirements regarding counterfeit security, must comply with how security and value documents, such as banknotes, stocks, bonds, Certificates, vouchers, security labels and the like.
  • Fig. 1 shows a section of a printing plate 1 in cross section, the surface 2 is provided with an engraving 3 of width a, which is used to hold color.
  • the engraving width a can reach up to about 3 mm and more.
  • the engraving is composed of two edge areas 4 and 5 and an inner area 6, the edge areas directly adjoining the inner area.
  • the interior was additionally equipped with a basic roughness pattern as color trap 7.
  • the edge area 5 is wedge-shaped and the edge area 4 is trapezoidal.
  • d is in the range from 10 ⁇ m to 500 ⁇ m. If a cone with a rounded tip is used as the stylus for engraving, it must be taken into account that corners and edges are engraved with rounded edges.
  • the geometric shape of the edge area is, for example, a wedge with a round tip.
  • the edge region is further characterized by its engraving depth, engraving width and the flank angles ⁇ and ⁇ , whereby in the case of a plurality of edge regions these can have the same or different engraving depths, widths and flank angles independently of one another.
  • the edge region 4 has an engraving depth t R , an engraving width b and flank angles ⁇ and ⁇ .
  • the edge region 5 also has the engraving depth t R , flank angles ⁇ and ⁇ , but an engraving width c.
  • the flank angles ⁇ and ⁇ based on the perpendicular to the printing plate surface, preferably range from 30 to 60 ° and can be selected independently of one another.
  • the edge regions expediently each have the same shape, ie trapezoidal or wedge shape with the same engraving depth, width and flank angle.
  • the inner region has an engraving depth t I which is smaller than the engraving depth t R of the edge region.
  • the engraving width e of the inner area is a function of the engraving width a, the geometric dimensions of the edge areas and the engraving depth
  • the engraving 10 which is used to receive color and is equipped with paint catcher 11, shows no inventive Subdivision into areas of greater and smaller engraving depths.
  • the depth of engraving t is constant over the entire engraving area.
  • the tactility determines over the engraving depth t and width f of the entire area, which is not according to the invention elaborated relief. Because of the uniform Engraving depth is the volume of the ink-receiving area in comparison to the printing plate according to the invention by the volume of the cleared interior larger, so much more color is needed to match Tactility and the same color impression when using opaque colors to produce as in the printing plate according to the invention.
  • a bank note is sketched as data carrier 12.
  • a Banknotes usually have different types of imprints.
  • the banknote shown shows, for example, a background pattern generated in offset printing 13 fine lines (guilloche) and one printed in letterpress Serial number 14.
  • the imprint according to the invention for example with a printing plate 1 can be generated in the example shown here only in one Part of the banknote is provided and consists of a printed Area 16, through which a portrait image is indicated.
  • the different Halftones of the image motif are created by varying the line spacing and / or line width reproduced.
  • Each one that appears in the portrait corresponds Line of a structural element printed according to the invention.
  • the border areas and interior of each structural element border seamlessly to each other and were in intaglio printing with different thicknesses Color layers printed, the edge area a thicker color layer has than the interior.
  • a large number Line structures on the area to be printed i.e.
  • An area with A high line density is, for example, the hair area 17 in the portrait. going one further assumes that the hair area 17 in a portrait depending on the motif usually takes up about half of the portrait area and the portrait again about half to a third of the area on the banknote, results in a production output of several billion pieces Banknotes a significant reduction in ink consumption and hence the production cost.
  • the data carrier 12 is pressed onto the printing plate, the data carrier 12 being embossed by the surface of the printing plate structured on the basis of the engraving 3, and at the same time the printing ink 22 is picked up from the engraving area 3 onto the upper side of the data carrier 18.
  • the difference in level between the non-printed substrate surface and the surfaces of the respective color area 19, 20 or 21 is defined as the ink layer thickness of the edge area D R and the inner area D I.
  • the printed area is characterized by a layer of color, which is thicker at the edge areas than in the interior and leaves a tactile perceptible print.
  • the color layer thicknesses of the edge regions 19 and 21 are the same and the profiles are wedge-shaped.
  • the edge regions 19 and 21 have different ink layer thicknesses and / or different profiles.
  • the printing inks have glazing or opaque properties, so that the edge areas and interior areas face the viewer as a homogeneous surface with very large ink layer thicknesses or as visually distinguishable areas with smaller ink layer thicknesses.
  • the advantage of the embodiments according to the invention is that the reduced color layer thickness of the inner areas compared to the edge areas leads to significant color savings.
  • tactility remains of the printed image is maintained or increased since the marginal areas Relief of the printed image due to the larger ink layer thickness in comparison reinforce to interior.
  • the color-saving effect makes itself felt noticeable. From a certain color layer thickness, the visual changes Impression of the color no longer, i.e. even with thicker paint application the printed image does not become darker but has reached a saturation value. To create a homogeneous color impression, it is therefore sufficient to use the interior to print just so thick that the darkest possible color is produced. The printing ink saved thereby reduces the production costs considerably.

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  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Printing Methods (AREA)
  • Printing Plates And Materials Therefor (AREA)

Abstract

The invention relates to an intaglio printing plate for producing a printing image with at least one engraved area in the printing plate surface, characterized in that the engraved area has one or more structural elements in which the edge area has a greater engraving depth than the inside area, the edge area and the inside area are directly adjacent, and the inside area is designed as a plateau that is lowered relative to the printing plate surface, to a method for producing the printing plates, to a data carrier with a printed image produced by intaglio, and an intaglio printing process.

Description

Die Erfindung betrifft einen Datenträger mit im Stichtiefdruckverfahren hergestelltem Druckbild, ein Stichtiefdruckverfahren sowie Druckplatten für die Durchführung des Stichtiefdruckverfahrens und ein Verfahren zur Herstellung der Druckplatten.The invention relates to a data carrier with intaglio printing Print image, a gravure printing process and printing plates for the Implementation of intaglio printing and a manufacturing process of the printing plates.

Kennzeichnend für die Tiefdrucktechnik ist, dass die druckenden, d.h. farbübertragenden Bereiche der Druckplatte als Vertiefungen in der Druckplattenoberfläche vorliegen. Diese Vertiefungen werden mittels eines geeigneten Gravierwerkzeugs oder mittels Ätzung erzeugt. Vor dem eigentlichen Druckvorgang wird auf die gravierte Druckplatte Farbe aufgetragen, und die überschüssige Druckfarbe mittels eines Abstreifrakels oder eines Wischzylinders von der Oberfläche der Druckplatte entfernt, so dass die Farbe lediglich in den Vertiefungen zurückbleibt. Anschließend wird ein Substrat, in der Regel Papier, gegen die Druckplatte gepresst und wieder abgezogen, wobei die Farbe an der Substratoberfläche haften bleibt und dort ein Druckbild bildet. Werden lasierende Farben verwendet, bestimmt die Dicke des Farbauftrags den Farbton. Durch den hohen Anpressdruck erfährt das Substratmaterial zusätzlich eine Prägung, die sich auch auf der Rückseite des Substrats abzeichnet.It is characteristic of gravure printing technology that the printing, i.e. ink-transferring areas of the printing plate as depressions in the printing plate surface available. These wells are made using a suitable one Engraving tool or generated by etching. Before the real one Printing process is applied to the engraved printing plate color, and the excess printing ink using a doctor blade or a Wiping cylinder removed from the surface of the printing plate, so that the Color only remains in the depressions. Then a Substrate, usually paper, pressed against the printing plate and removed again, whereby the paint adheres to the substrate surface and there forms a printed image. If glazing colors are used, that determines Thickness of the paint application the hue. Experienced by the high contact pressure The substrate material also has an embossing that is also on the back of the substrate.

Bei den Tiefdrucktechniken wird zwischen dem Rastertiefdruck und dem Stich- bzw. Linientiefdruck unterschieden. Beim Rastertiefdruckverfahren erfolgt die Herstellung der Druckplatten beispielsweise mittels Elektronenstrahl, Laserstrahl oder Stichel. Kennzeichnend für den Rastertiefdruck ist, dass unterschiedliche Grau- oder Farbwerte des Druckbildes durch regelmäßig in der Druckplatte angeordnete Näpfchen unterschiedlicher Dichte, Größe und/oder Tiefe erzeugt werden. In gravure printing, a distinction is made between screen printing and the Differentiation between engraved and line gravure. With the gravure printing process the production of the printing plates, for example using an electron beam, Laser beam or prick. Characteristic of gravure printing is that different gray or color values of the printed image due to regular wells of different density and size arranged in the pressure plate and / or depth are generated.

Im Gegensatz hierzu werden beim Stichtiefdruck in die Druckplatten linienförmige Vertiefungen eingebracht, um ein Druckbild zu erzeugen. Bei der mechanisch gefertigten Druckplatte für den Stichtiefdruck wird aufgrund der üblicherweise konisch zulaufenden Gravierwerkzeuge mit zunehmender Stichtiefe eine breitere Linie erzeugt. Außerdem nimmt die Farbaufnahmefähigkeit der gravierten Linie und damit die Opazität der gedruckten Linie mit zunehmender Stichtiefe zu. Bei der Ätzung von Stichtiefdruckplatten werden die nicht druckenden Bereiche der Druckplatte mit einem chemisch inerten Lack abgedeckt. Durch nachfolgendes Ätzen wird in der freiliegenden Plattenoberfläche die Gravur erzeugt, wobei die Tiefe der Gravurlinien insbesondere von der Ätzdauer und Linienbreite abhängen.In contrast, intaglio printing is linear in the printing plates Wells are introduced to create a printed image. In the mechanically manufactured printing plate for intaglio printing is due of the usually tapered engraving tools with increasing Stitch depth creates a wider line. In addition, the ink absorption capacity decreases the engraved line and thus the opacity of the printed line with increasing stitch depth. When etching intaglio plates the non-printing areas of the printing plate with a chemically inert Lacquer covered. Subsequent etching will result in the exposed Plate surface produces the engraving, the depth of the engraving lines in particular depend on the etching time and line width.

Die Linien- bzw. Stichtiefdrucktechnik, insbesondere die Stahlstichtiefdrucktechnik, liefert ein charakteristisches, auch für Laien leicht erkennbares Druckbild, das mit anderen gängigen Druckverfahren nicht nachgestellt werden kann. Bei ausreichender Tiefe der Gravuren in der Druckplatte erhält nämlich ein im Stichtiefdruck bedruckter Datenträger durch Prägung und Farbauftrag ein Druckbild, das ein mit dem Tastsinn wahrnehmbares Relief bildet. Die Stahlstichtiefdrucktechnik wird daher bevorzugt für das Bedrucken von Datenträgern, insbesondere Sicherheits- und Wertdokumenten, wie beispielsweise Banknoten, Aktien, Anleihen, Urkunden, Gutscheine, Sicherheitsetiketten und dergleichen, die hohe Anforderungen bezüglich der Fälschungssicherheit erfüllen müssen, verwendet.Line or intaglio printing technology, especially steel intaglio printing technology, provides a characteristic, easily recognizable even for laypersons Print image that is not reproduced with other common printing processes can be. With sufficient depth of the engravings in the printing plate namely a data carrier printed in intaglio by embossing and ink application a printed image that is perceptible with the sense of touch Relief forms. The intaglio printing technique is therefore preferred for the Printing on data carriers, especially security and security documents, such as banknotes, shares, bonds, certificates, vouchers, Security labels and the like, which have high requirements regarding the Counterfeit protection must be used.

Aus der WO 97/48555 ist ein Verfahren bekannt, mit dem Stichtiefdruckplat ten auf reproduzierbare, maschinelle Weise hergestellt werden können. Dazu werden die Linien einer Strichvorlage erfasst und die Fläche einer jeden Linie wird exakt bestimmt. Mit einem Gravierwerkzeug, beispielsweise einem rotierenden Stichel oder einem Laserstrahl, wird zunächst die Außenkontur dieser Fläche graviert, um die Fläche sauber zu umranden. Anschließend wird der umrandete Bereich der Fläche mittels desselben oder eines anderen Gravierwerkzeugs geräumt, so dass die gesamte Linie entsprechend der Strichvorlage exakt graviert ist. Je nach Form und Führung des Gravierwerkzeugs entsteht am Grund der geräumten Fläche ein Rauigkeitsgrundmuster, das als Farbfang für die Druckfarbe dient.A method is known from WO 97/48555 using the intaglio printing plate can be produced in a reproducible, mechanical way. To the lines of a line template are recorded and the area of each Line is determined exactly. With an engraving tool, for example one rotating stylus or a laser beam, first the outer contour this area is engraved to cleanly frame the area. Subsequently the bordered area of the surface is created using the same or a other engraving tool cleared, so the entire line accordingly the line template is exactly engraved. Depending on the shape and guidance of the engraving tool there is a basic roughness pattern at the bottom of the cleared area, that serves as a color catcher for the printing ink.

Um ein ausreichendes Maß an Taktilität des durch Stichtiefdruck erzeugten Bildes zu erreichen, wird gemäß den Verfahren im Stand der Technik ein sehr dicker Farbauftrag benötigt. Dicker Farbauftrag bedeutet jedoch zugleich großer Verbrauch an Druckfarben, was wiederum hohe Produktionskosten zur Folge hat. Daneben muss bei der konventionellen Technik die auf die Druckplatte aufgebrachte Druckfarbenmenge erhöht werden, um alle gravierten Bereiche, die taktile Strukturen im Druckbild ergeben sollen, mit Farbe zu schließen. Dabei fällt vermehrt überschüssige Farbe an, die mittels eines Abstreifrakels oder eines Wischzylinders von der Oberfläche der Druckplatte entfernt werden muss, was zu Problemen bei der Entsorgung der abgestreiften Druckfarben führt.To a sufficient degree of tactility of the intaglio Reaching the image is done according to the methods in the prior art very thick paint application needed. But thick application of paint means at the same time large consumption of printing inks, which in turn leads to high production costs has the consequence. In addition, with conventional technology, the the amount of ink applied to the printing plate can be increased to all engraved areas that should result in tactile structures in the printed image Close color. Excess paint accumulates, which means a squeegee or a wiper cylinder from the surface of the Pressure plate must be removed, causing problems with disposal of stripped printing inks.

Die Aufgabe der vorliegenden Erfindung besteht darin, die Taktilität des Druckbildes zu erhalten bzw. zu verbessern, bei gleichzeitiger Einsparung von Farbe, ohne dabei den Farbeindruck des Druckbilds gegenüber einem nach herkömmlicher Stichtiefdrucktechnik gedruckten Bildes zu verändern.The object of the present invention is to improve the tactility of the Preserve or improve the printed image, while saving of color without losing the color impression of the printed image compared to one to change the image printed using conventional intaglio printing.

Diese Aufgabe wird durch die unabhängigen Ansprüche gelöst. Weiterbildungen sind Gegenstand der Unteransprüche.This task is solved by the independent claims. further developments are the subject of the subclaims.

Die erfindungsgemäße Stichtiefdruckplatte zeichnet sich durch wenigstens einen gravierten Bereich in der Druckplattenoberfläche aus, wobei der gravierte Bereich ein oder mehrere Strukturelemente aufweist, bei denen der Randbereich eine größere Gravurtiefe aufweist als der Innenbereich, der Randbereich und der Innenbereich direkt aneinander grenzen und der Innenbereich als gegenüber der Druckplattenoberfläche abgesenktes Plateau ausgestaltet ist. Ein in die erfindungsgemäße Stichtiefdruckplatte eingraviertes Druckbild weist vorzugsweise mehrere derartige Strukturelemente auf.The intaglio printing plate according to the invention is characterized by at least an engraved area in the printing plate surface, the engraved Area has one or more structural elements in which the Edge area has a greater engraving depth than the inner area, the The border area and the interior area directly adjoin each other and the interior area as a plateau lowered in relation to the printing plate surface is designed. An engraved in the intaglio printing plate according to the invention The printed image preferably has several such structural elements.

Der Gravurtiefenunterschied zwischen Randbereichen und Innenbereichen erhöht im erfindungsgemäß erzeugten Druckbild die Taktilität, da gegenüber einem gemäß Stand der Technik erzeugten Druckbild die Reliefstruktur des bedruckten Bereichs wesentlich komplexer ist. Der gedruckte Bereich weist im Querschnitt ein rillenförmiges Profil auf, das beim Überstreichen mit bloßem Finger taktil wahrnehmbar ist. Durch den häufigen Wechsel von taktil fühlbarem Randbereich zu Innenbereich wird der charakteristische taktile Eindruck eines Stichtiefdruckbildes noch verstärkt. Bei entsprechenden Abmessungen der Gravurbereiche ist der Übergang von Erhebungen und Vertiefungen im Druckbild deutlich fühlbar, so dass die unterschiedlichen Rand- bzw. Innenbereiche individuell auszumachen sind.The difference in engraving depth between edge areas and interior areas increases the tactility in the print image produced according to the invention, since the relief structure in a print image generated according to the prior art of the printed area is much more complex. The printed area has a groove-shaped profile in cross-section, which when swept is tactile perceptible with the bare finger. Due to the frequent change from The characteristic tactile becomes the tactile perceptible edge area to the inner area The impression of a intaglio printing image is enhanced. With appropriate Dimensions of the engraving areas is the transition from bumps and Wells in the printed image can be clearly felt, so that the different Border or interior areas can be identified individually.

Des Weiteren wird bei gleicher oder sogar verbesserter Taktilität des Druckbildes Druckfarbe eingespart, da lediglich im Randbereich soviel Farbe übertragen werden muß, dass er taktil fühlbar ist. Im Innenbereich muss nur soviel Farbe übertragen werden, dass der gewünschte Farbton erreicht wird. In der Druckplatte müssen daher die Innenbereiche weniger tief graviert werden als die Randbereiche, so dass sich das farbaufnehmende Volumen des gravierten Bereichs deutlich verringert. Darüber hinaus können Druckprobleme, die durch das Füllen größerer, besonders tief gravierter Flächen entstehen, wie das Ausspritzen der Farbe aus dem Gravurbereich beim Druckvorgang oder der nicht vollständige Übertrag der Druckfarbe aus der Gravur auf die Oberfläche des zu bedruckenden Substrats, vermieden werden.Furthermore, the tactility of the printed image is the same or even improved Printing ink saved because only so much color is transferred in the edge area must be felt tactilely. Only so much must be used indoors Color are transferred so that the desired shade is achieved. In The inside of the printing plate must therefore be engraved less deeply than the edge areas, so that the color-absorbing volume of the engraved area significantly reduced. In addition, printing problems, that result from filling larger, particularly deeply engraved areas, like spraying the color out of the engraving area during the printing process or the incomplete transfer of the ink from the engraving on the surface of the substrate to be printed.

Das Querschnittsprofil des Randbereiches in der Druckplatte kann dabei jegliche denkbare Form aufweisen, ist jedoch zweckmäßigerweise keilförmig oder trapezförmig ausgestaltet. Denkbar ist auch eine treppenförmige Ausgestaltung des Randbereichs, d.h. der Randbereich selbst weist unterschiedliche Gravurtiefen auf. Bei mehreren Strukturelementen eines Druckbildes können die Randbereiche auch unabhängig voneinander die gleiche oder unterschiedliche Form aufweisen. Z.B. kann der Randbereich eines Strukturelementes keilförmig und ein weiterer trapezförmig graviert sein.The cross-sectional profile of the edge area in the pressure plate can have any conceivable shape, but is expediently wedge-shaped or designed trapezoidal. A step-like configuration is also conceivable the edge area, i.e. the edge area itself has different Engraving depths. With several structural elements of a print image the edge areas can also be the same or different independently of one another Have shape. For example, can the edge area of a structural element wedge-shaped and another trapezoidal.

Die Geometrie der Keil- und Trapezform ist keinerlei Einschränkungen unterworfen, d.h. Seitenlängenverhältnisse und Winkel können uneingeschränkt vom Fachmann gewählt werden.The geometry of the wedge and trapezoidal shape is not subject to any restrictions, i.e. Side aspect ratios and angles can be unlimited be chosen by a specialist.

Der Innenbereich ist gegenüber der Druckplattenoberfläche abgesenkt, wobei das Querschnittsprofil als Plateau ausgebildet ist, d.h. der Innenbereich bildet eine Ebene, die vorzugsweise parallel zur Druckplattenoberfläche ausgerichtet ist. Selbstverständlich sind auch Ausführungen denkbar, bei denen der Innenbereich als schiefe Ebene bezogen auf die Druckplattenoberfläche vorliegt.The interior is lowered compared to the printing plate surface, whereby the cross-sectional profile is designed as a plateau, i.e. the interior forms a plane that is preferably parallel to the printing plate surface is aligned. Of course, versions are also conceivable at which the interior as an inclined plane in relation to the printing plate surface is present.

Die Oberfläche des Innenbereichs kann mit einem Rauigkeitsgrundmuster ausgestattet sein, das als Farbfang für die Druckfarbe dient. Dies ist bei Abmessungen des Innenbereichs ab einer Länge und Breite von etwa 100 µm zweckmäßig. Auch bei trapez- oder rechteckförmigen Randbereichen, die eine mindestens etwa 100 µm breite und lange Grundfläche aufweisen, kann das Rauigkeitsgrundmuster eingearbeitet werden. Das Rauigkeitsgrundmuster wird beispielsweise gemäß dem in WO 97/48555 beschriebenen Verfahren bei der Gravur der Druckplatte am Grund der geräumten Flächen erzeugt.The surface of the interior can be with a basic roughness pattern be equipped, which serves as an ink catcher for the printing ink. This is with dimensions the interior from a length and width of about 100 microns appropriate. Even with trapezoidal or rectangular edge areas, the one have at least about 100 microns wide and long base area the basic roughness pattern can be incorporated. The basic roughness pattern is, for example, according to the method described in WO 97/48555 created in the engraving of the printing plate at the bottom of the cleared areas.

Randbereich und Innenbereich stoßen direkt aneinander, d.h. sie sind direkt benachbart und nicht durch Stege, die Druckplattenniveau aufweisen, beabstandet. Im späteren Druckbild sind somit Rand- und Innenbereich nicht durch unbedruckte Bereiche voneinander getrennt.The edge area and the interior area meet directly, i.e. they are direct adjacent and not spaced by webs that have pressure plate level. In the later print image, the marginal and inner areas are therefore not separated from each other by blank areas.

Die Gravurtiefe und -breite der Rand- bzw. Innenbereiche eines Strukturelementes werden vom Fachmann so gewählt, dass im späteren Druckbild die gewünschte Breite, Farbschichtdicke und der gewünschte Farbton der entsprechenden gedruckten Strukturelemente erzeugt wird.The depth and width of the engraving of the edge or interior areas of a structural element are chosen by the specialist so that in the later print image the desired width, color layer thickness and the desired color tone corresponding printed structural elements is generated.

Bei Verwendung handelsüblicher Stichtiefdruckfarben liegt die Gravurtiefe des Randbereiches etwa im Bereich von 60 µm bis 150 µm und die des In nenbereichs etwa im Bereich von 10 µm bis 120 µm.When using commercially available intaglio printing inks, the engraving depth is the edge area in the range of about 60 µm to 150 µm and that of the In NEN range approximately in the range of 10 microns to 120 microns.

Vorzugsweise liegt die Gravurtiefe des Randbereichs im Bereich von 100 µm bis 150 µm und die des Innenbereichs im Bereich von 60 µm bis 100 µm. Bei diesen Gravurtiefen wird mit handelsüblichen Stichtiefdruckfarben im Druckbild eine Farbschichtdicke erreicht, bei der die Druckfarben bereits deckend sind und nicht mehr lasierend wirken, d.h. ein mit einer entsprechend tiefgravierten Druckplatte erzeugtes Druckbild weist nur einen Farbton auf. Damit kann ein Druckbild erzeugt werden, das über seine gesamte Fläche einen einheitlichen Farbton aufweist, und dabei keinen farblich abgesetzten, aber dennoch taktil wahrnehmbaren Rand aufweist. The engraving depth of the edge region is preferably in the range of 100 μm up to 150 µm and that of the interior in the range from 60 µm to 100 µm. at These engraving depths are made using commercially available intaglio printing inks Print image reaches an ink layer thickness at which the printing inks already are opaque and no longer have a glaze effect, i.e. one with one accordingly The deeply engraved printing plate has only one color on. This enables a print image to be created that covers the entire area Surface has a uniform color and no contrasting colors, but still has a tactile perceptible edge.

Bei Gravurtiefen von weniger als etwa 60 µm haben die Druckfarben lasierenden Charakter im Druckbild. Sie sind bei diesen Gravurtiefen nicht mehr opak, d.h. der Farbton im Druckbild hängt von der Farbschichtdicke ab. Wählt man diese Gravurtiefen, können die Druckbilder mit einem taktil wahrnehmbaren und farblich vom Innenbereich abgegrenzten Rand ausgestattet werden. Zudem besteht die Möglichkeit einen opaken Randbereich mit einem lasierenden Innenbereich zu kombinieren.With engraving depths of less than about 60 µm, the printing inks have glazing Character in the printed image. You are no longer at these engraving depths opaque, i.e. the color tone in the printed image depends on the ink layer thickness. If you choose these engraving depths, the printed images can be used with a tactile perceptible and color-coded border from the interior become. There is also the option of an opaque edge area to combine with a glazed interior.

Wird der Innenbereich nicht als zur Druckplattenoberfläche paralleles Plateau ausgestaltet, sondern als schiefe Ebene, können bei Verwendung von lasierenden Farben auch Farbverläufe von Hell nach Dunkel im Innenbereich des Strukturelements erzeugt werden.If the interior is not a plateau parallel to the printing plate surface designed, but as an inclined plane, can be used when glazing Colors also color gradients from light to dark indoors of the structural element are generated.

Weiterhin kann die Gravurtiefe eines Randbereichs, beispielsweise im Verlauf einer gravierten Linie, kontinuierlich bzw. stufenweise vergrößert bzw. verkleinert werden. Sind im Druckbild mehrere erfindungsgemäße Strukturelemente vorgesehen, können die Rand- und Innenbereiche unabhängig voneinander die gleiche oder unterschiedliche Gravurtiefe aufweisen.Furthermore, the engraving depth of an edge area, for example in the course an engraved line, continuously or gradually enlarged or be made smaller. Are several structural elements according to the invention in the printed image provided, the border and interior areas can be independent have the same or different engraving depth from each other.

Allein durch Variationen der Gravurtiefe in den Rand- und Innenbereichen ergeben sich somit die unterschiedlichsten Kombinations- und Gestaltungsmöglichkeiten im Druckbild.Simply by varying the depth of engraving in the margins and interior areas This results in the most diverse combination and design options in the printed image.

Die Gravurbreite der Rand- und Innenbereiche bestimmt sich hauptsächlich nach dem gewünschten Druckbild. Die Gravurbreite des Randbereichs liegt im Bereich von 120 µm bis 500 µm. Die Gravurbreite des Innenbereichs ergibt sich bei der Gravur des Strukturelementes zwangsläufig aus der Gravurbreite des Strukturelements, der Gravurbreite des Randbereichs und der Gravurtiefe des Innenbereichs. The engraving width of the marginal and inner areas is mainly determined according to the desired print image. The engraving width of the edge area is in the range from 120 µm to 500 µm. The engraving width of the inner area results when engraving the structural element inevitably from the engraving width of the structural element, the engraving width of the edge area and the engraving depth of the interior.

Das Strukturelement kann ein beliebiges geometrisches Element darstellen, z.B. Linien unterschiedlichster Breite, bevorzugt mit einer Breite bis zu 3 mm oder mehr, oder Elemente mit z.B. kreisförmiger, drei- oder viereckiger oder asymmetrischer Umrissstruktur, ein Bildzeichen, Schriftzeichen oder sonstiges Symbol, wobei Schriftzeichen insbesondere alphanumerische Zeichen bevorzugt sind. Es können auch mehrere Strukturelemente in beliebiger Anzahl und Form kombiniert werden. Selbstverständlich ist es auch möglich, die erfindungsgemäß gedruckten Linien und/ oder Elemente mit Linien und/oder Elementen zu kombinieren, die mit anderen Drucktechniken, z.B. konventionellem Stichtiefdruck, Offsetdruck etc., erzeugt werden.The structural element can represent any geometric element, e.g. Lines of different widths, preferably with a width up to 3 mm or more, or elements with e.g. circular, triangular or square or asymmetrical outline structure, a symbol, characters or other symbol, with characters in particular alphanumeric Characters are preferred. You can also use multiple structural elements in any Number and shape can be combined. Of course it is too possible with the lines and / or elements printed according to the invention To combine lines and / or elements with other printing techniques, e.g. conventional intaglio printing, offset printing, etc.

Die erfindungsgemäßen Stichtiefdruckplatten werden vorzugsweise durch Gravur mit einem schnell rotierenden, spitz zulaufenden Stichel hergestellt. Entsprechend der Umrissform der zu bedruckenden Fläche werden durch das Gravierwerkzeug Vertiefungen mit gezielter Variation der Gravurtiefe in die Oberfläche der Druckplatte eingebracht und für den Druckvorgang mit Farbe gefüllt. Beim Drucken wird die Druckfarbe aus den Vertiefungen der Platte auf die Oberfläche eines Substrats übertragen. Von den unbehandelten, d.h. nicht gravierten Oberflächenbereichen der Druckplatte wird keine Farbe übertragen.The intaglio printing plates according to the invention are preferably made by Engraving made with a rapidly rotating, tapering stylus. According to the outline shape of the surface to be printed, through the engraving tool recesses with targeted variation of the engraving depth in introduced the surface of the printing plate and for the printing process Color filled. When printing, the printing ink is made from the depressions of the Transfer plate to the surface of a substrate. Of the untreated, i.e. non-engraved surface areas of the printing plate will not Transfer color.

Bedruckt man mit dem eben beschriebenen Verfahren einen Datenträger, ergibt sich abhängig von der Form der oben beschriebenen Gravur der erfindungsgemäßen Druckplatte ein entsprechend gestaltetes Druckbild auf dem Datenträger. Dieser Datenträger zeichnet sich erfindungsgemäß durch wenigstens ein Strukturelement aus, das im Stichtiefdruckverfahren hergestellt ist und bei dem Randbereich und Innenbereich unterschiedliche Farbschichtdicken aufweisen. Der Randbereich und der Innenbereich grenzen unmittelbar aneinander, wobei der Randbereich eine größere Farbschichtdicke als der Innenbereich aufweist und der Innenbereich als gegenüber dem Randbereich abgesenktes Plateau ausgestaltet ist. Die Abmessungen der Farbschichtbereiche im Druckbild, wie Breite und Farbschichtdicke, ergeben sich aus den oben angegeben Werten für Gravurtiefe und -breite der erfindungsgemäßen Druckplatte und in Abhängigkeit der verwendeten Druckfarbe beim Drucken. Allerdings sind die Übergänge zwischen Rand- und Innenbereichen sowie die Kanten und Ecken der gedruckten Bereiche nicht punktgenau abgrenzbar wie in der gravierten Druckplatte. Die Übergänge zwischen Rand- und Innenbereich sowie die Form der Kanten und Ecken im Druckbild sind dabei in Abhängigkeit von der verwendeten Druckfarbenzusammensetzung und ihrer Zähflüssigkeit wie auch in Abhängigkeit der Druckplattengravurtiefe mehr oder weniger fließend.If one prints a data carrier with the method just described, results depends on the shape of the above-described engraving of the invention Printing plate a correspondingly designed print image on the Disk. According to the invention, this data carrier is characterized by at least a structural element made by intaglio printing and in the border area and inside area different color layer thicknesses exhibit. The border area and the interior area border directly next to each other, with the edge area having a greater layer of color than the interior and the interior as opposed to the Edge area of the lowered plateau is designed. The dimensions of the Color layer areas in the printed image, such as width and ink layer thickness, result from the values given above for the engraving depth and width of the invention Printing plate and depending on the printing ink used while printing. However, the transitions between marginal and inner areas as well as the edges and corners of the printed areas can be delimited precisely as in the engraved printing plate. The transitions between edge and inside area as well as the shape of the edges and corners in the The printed image depends on the ink composition used and their viscosity as well as depending on the Printing plate engraving depth more or less fluent.

Wie oben beschrieben, führt der Farbdickenunterschied zwischen Randbereichen und Innenbereichen zu erhöhter Taktilität des erfindungsgemäß erzeugten Strukturelements des Druckbilds, da gegenüber einem gemäß Stand der Technik erzeugten Druckbild die Reliefstruktur des bedruckten Bereichs wesentlich komplexer ist. Das im Querschnitt rillenförmige Profil der bedruckten Bereiche ist beim Überstreichen mit bloßem Finger taktil besser wahrnehmbar. Bei entsprechenden Abmessungen der Gravurbereiche ist der Übergang von Erhebungen und Vertiefungen im Druckbild deutlich fühlbar, so dass die unterschiedlichen Rand- bzw. Innenbereiche individuell auszumachen sind.As described above, the difference in color thickness leads between edge areas and interior areas for increased tactility of the generated according to the invention Structural element of the printed image, as compared to one according to the state the printed image generated the relief structure of the printed area is much more complex. The grooved profile of the printed cross section Areas are tactile better when sweeping with your bare finger imperceptible. With corresponding dimensions of the engraving areas, the Transition of elevations and depressions in the printed image can be clearly felt, so that the different border and interior areas can be identified individually are.

Des Weiteren wird bei gleicher oder sogar verbesserter Taktilität des Druckbildes Druckfarbe eingespart, da die Innenbereiche weniger Druckfarbe aufweisen als die Randbereiche. Furthermore, the tactility of the printed image is the same or even improved Ink saved because the inner areas use less ink have than the edge areas.

Je nach gewählter Farbschichtdicke der Rand- und Innenbereiche können die üblichen Stichtiefdruckfarben deckend oder in gewissem Grade lasierend und durchscheinend verdruckt werden. Mit geeigneten Schichtdicken und sinnvoller Wahl der Farbe des Untergrundes ergeben sich Farbtöne unterschiedlicher Helligkeit und Farbsättigung. Bei ausreichend unterschiedlichen Farbschichtdicken ergeben sich für das menschliche Auge ohne weitere Hilfsmittel gut sichtbare Kontraste. Normale Beleuchtungsverhältnisse und ein normaler Betrachtungsabstand werden dabei vorausgesetzt.Depending on the selected color layer thickness of the border and interior areas, the usual intaglio inks or opaque to a certain extent and translucent printed. With suitable layer thicknesses and A sensible choice of the color of the surface results in different shades Brightness and color saturation. With sufficiently different Color layer thicknesses arise for the human eye without further notice Aids clearly visible contrasts. Normal lighting conditions and a normal viewing distance is assumed.

Werden beim erfindungsgemäßen Druck deckende Druckfarben verwendet, wird ein Druckbild erzeugt, das unabhängig davon, wie dick der Farbauftrag ist, über seine gesamte Fläche einen einheitlichen Farbton aufweist, und dabei keinen farblich abgesetzten, aber dennoch taktil wahrnehmbaren Rand aufweist.If opaque printing inks are used in the printing according to the invention, a print image is created, regardless of how thick the color application has a uniform color over its entire surface, and no border in contrasting colors, but still tactile perceptible having.

Werden beim erfindungsgemäßen Druck lasierende Druckfarben verwendet, hängt der Farbton im Druckbild von der Farbschichtdicke ab. Damit können abhängig von der Farbschichtdicke die Druckbilder mit einem taktil wahrnehmbaren und farblich vom Innenbereich abgegrenzten Rand ausgestattet werden oder ein opaker Randbereich mit einem lasierenden Innenbereich kombiniert werden.If glazing printing inks are used in the printing according to the invention, the color tone in the printed image depends on the ink layer thickness. So that can Depending on the thickness of the ink layer, the print images can be perceived with a tactile and color-coded border from the interior or an opaque border area with a glazed interior be combined.

Im Übrigen gilt für die Farbschicht der Innen- und Randbereiche hinsichtlich ihrer gestalterischen Variationsmöglichkeiten das für die Gravur der Druckplatte Erläuterte entsprechend.Incidentally, the same applies to the color layer of the inner and peripheral areas of their creative variation possibilities that for the engraving of the printing plate Explained accordingly.

Zum Bedrucken mit dem erfindungsgemäßen Verfahren eignen sich alle für den Stichtiefdruck in Frage kommenden Substratmaterialien, wie Papier, Kunststofffolien, mit Kunststofffolien kaschiertes oder lackiertes Papier sowie mehrschichtige Kompositmaterialien. Insbesondere eignet sich das erfindungsgemäße Verfahren zum Bedrucken von Datenträgern, die hohe Anforderungen bezüglich der Fälschungssicherheit erfüllen müssen, wie Sicherheits- und Wertdokumente, wie beispielsweise Banknoten, Aktien, Anleihen, Urkunden, Gutscheine, Sicherheitsetiketten und dergleichen.All are suitable for printing on with the method according to the invention intaglio substrate materials, such as paper, Plastic films, paper laminated or coated with plastic films and multilayer composite materials. The invention is particularly suitable Process for printing on data carriers that have high requirements regarding counterfeit security, must comply with how security and value documents, such as banknotes, stocks, bonds, Certificates, vouchers, security labels and the like.

Weitere Ausführungsformen und Vorteile der Erfindung werden nachfolgend anhand der Figuren erläutert. Die in den Figuren gezeigten Proportionen entsprechen nicht unbedingt den in der Realität vorliegenden Verhältnissen und dienen vornehmlich zur Verbesserung der Anschaulichkeit.Further embodiments and advantages of the invention are as follows explained with reference to the figures. The proportions shown in the figures do not necessarily correspond to the real situation and primarily serve to improve clarity.

Es zeigen:

Fig. 1
einen Ausschnitt einer erfindungsgemäßen Druckplatte im Querschnitte
Fig. 2
einen Ausschnitt einer konventionellen Druckplatte im Querschnitt,
Fig. 3
eine Banknote in Aufsicht,
Fig. 4
einen Ausschnitt eines bedruckten Datenträgers im Querschnitt.
Show it:
Fig. 1
a section of a printing plate according to the invention in cross sections
Fig. 2
a section of a conventional printing plate in cross section,
Fig. 3
a banknote under supervision,
Fig. 4
a section of a printed data carrier in cross section.

Fig. 1 zeigt einen Ausschnitt aus einer Druckplatte 1 im Querschnitt, deren Oberfläche 2 mit einer Gravur 3 der Breite a versehen ist, die der Aufnahme von Farbe dient. Die Gravurbreite a kann bis zu etwa 3 mm und mehr reichen. Die Gravur setzt sich aus zwei Randbereichen 4 und 5 und einem Innenbereich 6 zusammen, wobei die Randbereiche direkt an den Innenbereich angrenzen. Der Innenbereich wurde zusätzlich mit einem Rauigkeitsgrundmuster als Farbfang 7 ausgestattet. Der Randbereich 5 ist keilförmig und der Randbereich 4 trapezförmig ausgestaltet. Bei der keilförmigen Variante ist die Breite der Grundfläche d = 0 µm bzw. liegt auf Grund einer gewissen räumlichen Ausdehnung des Gravurstichels annähernd bei 0 µm und kann bis 10 µm reichen. Bei der trapez- oder anderen rechteckförmigen Ausbildung liegt d im Bereich von 10 µm bis 500 µm. Wird bei der Gravur als Stichel ein Kegel mit abgerundeter Spitze verwendet, ist zu berücksichtigen, dass Ecken und Kanten abgerundet graviert werden. Als geometrische Form des Randbereichs ergibt sich damit beispielsweise ein Keil mit runder Spitze. Statt zweier Randbereiche ist es aber auch möglich, nur einen Randbereich tiefer zu gravieren. Besonders sinnvoll kann diese Ausführungsvariante beispielsweise auf einer Seite einer in sich geschlossenen Linie in freier Form oder als Umrandung einer geschlossenen geometrischen Figur, wie eines Kreises eingesetzt werden. Ebenso kann die Umrandung auch nur in einem Teilbereich tiefer graviert werden. So ist es z.B. bei einem Rechteck denkbar, nur eine Seitenlinie als tiefer gravierten Randbereich auszugestalten. Der Randbereich wird durch seine Gravurtiefe, Gravurbreite sowie die Flankenwinkel α und β weiterhin charakterisiert, wobei bei mehreren Randbereichen diese unabhängig voneinander gleiche oder unterschiedliche Gravurtiefen,-breiten und Flankenwinkel aufweisen können. Vorliegend weist der Randbereich 4 eine Gravurtiefe tR, eine Gravurbreite b und Flankenwinkel α und β auf. Der Randbereich 5 weist ebenfalls die Gravurtiefe tR, Flankenwinkel α und β, aber eine Gravurbreite c auf. Die Flankenwinkel α und β, bezogen auf die Lotsenkrechte zur Druckplattenoberfläche, reichen bevorzugt von 30 bis 60 ° und können unabhängig voneinander gewählt werden. Zweckmäßigerweise besitzen die Randbereiche jeweils die gleiche Form, d.h. Trapez- oder Keilform bei gleicher Gravurtiefe, -breite und Flankenwinkel. Der Innenbereich weist eine Gravurtiefe tI auf, die kleiner als die Gravurtiefe tR des Randbereiches ist. Die Gravurbreite e des Innenbereichs ergibt sich in Abhängigkeit von der Gravurbreite a, den geometrischen Abmessungen der Randbereiche sowie der Gravurtiefe tI.Fig. 1 shows a section of a printing plate 1 in cross section, the surface 2 is provided with an engraving 3 of width a, which is used to hold color. The engraving width a can reach up to about 3 mm and more. The engraving is composed of two edge areas 4 and 5 and an inner area 6, the edge areas directly adjoining the inner area. The interior was additionally equipped with a basic roughness pattern as color trap 7. The edge area 5 is wedge-shaped and the edge area 4 is trapezoidal. In the wedge-shaped variant, the width of the base area is d = 0 µm or, due to a certain spatial extent of the engraving stylus, is approximately 0 µm and can range up to 10 µm. In the trapezoidal or other rectangular configuration, d is in the range from 10 μm to 500 μm. If a cone with a rounded tip is used as the stylus for engraving, it must be taken into account that corners and edges are engraved with rounded edges. The geometric shape of the edge area is, for example, a wedge with a round tip. Instead of two edge areas, it is also possible to engrave only one edge area deeper. This variant can be particularly useful, for example, on one side of a self-contained line in free form or as a border around a closed geometric figure, such as a circle. The border can also be engraved deeper only in a partial area. With a rectangle, for example, it is conceivable to design only one side line as a deeper engraved edge area. The edge region is further characterized by its engraving depth, engraving width and the flank angles α and β, whereby in the case of a plurality of edge regions these can have the same or different engraving depths, widths and flank angles independently of one another. In the present case, the edge region 4 has an engraving depth t R , an engraving width b and flank angles α and β. The edge region 5 also has the engraving depth t R , flank angles α and β, but an engraving width c. The flank angles α and β, based on the perpendicular to the printing plate surface, preferably range from 30 to 60 ° and can be selected independently of one another. The edge regions expediently each have the same shape, ie trapezoidal or wedge shape with the same engraving depth, width and flank angle. The inner region has an engraving depth t I which is smaller than the engraving depth t R of the edge region. The engraving width e of the inner area is a function of the engraving width a, the geometric dimensions of the edge areas and the engraving depth t I.

Fig. 2 zeigt den Querschnitt einer Druckplatte 8 mit gravierter Oberfläche 9 gemäß Stand der Technik. Die Gravur 10, die der Aufnahme von Farbe dient und mit Farbfang 11 ausgestattet ist, zeigt dabei keine erfindungsgemäße Unterteilung in Bereiche größerer und kleinerer Gravurtiefen. Die Gravurtiefe t ist über den gesamten Gravurbereich konstant. Die Taktilität bestimmt sich über die Gravurtiefe t und -breite f der gesamten Fläche, die kein erfindungsgemäß ausgearbeitetes Relief aufweist. Auf Grund der einheitlichen Gravurtiefe ist das Volumen des farbaufnehmenden Bereichs im Vergleich zur erfindungsgemäßen Druckplatte um das Volumen des geräumten Innenbereichs größer, so dass wesentlich mehr Farbe benötigt wird, um gleiche Taktilität und bei Verwendung deckender Farben den gleichen Farbeindruck zu erzeugen wie bei der erfindungsgemäßen Druckplatte.2 shows the cross section of a printing plate 8 with an engraved surface 9 according to the state of the art. The engraving 10, which is used to receive color and is equipped with paint catcher 11, shows no inventive Subdivision into areas of greater and smaller engraving depths. The depth of engraving t is constant over the entire engraving area. The tactility determines over the engraving depth t and width f of the entire area, which is not according to the invention elaborated relief. Because of the uniform Engraving depth is the volume of the ink-receiving area in comparison to the printing plate according to the invention by the volume of the cleared interior larger, so much more color is needed to match Tactility and the same color impression when using opaque colors to produce as in the printing plate according to the invention.

In Fig. 3 ist als Datenträger 12 skizzenhaft eine Banknote dargestellt. Eine Banknote weist üblicherweise verschiedene Typen von Aufdrucken auf. Die dargestellte Banknote zeigt beispielsweise ein im Offsetdruck erzeugtes Hintergrundmuster 13 feiner Linien (Guillochen) und eine im Buchdruck aufgebrachte Seriennummer 14. Ferner ist ein Druckbild 15, das die Zahl 5 darstellt, vorhanden. Dieses Druckbild 15 wird in konventioneller Stichtiefdrucktechnik umgesetzt.In Fig. 3, a bank note is sketched as data carrier 12. A Banknotes usually have different types of imprints. The The banknote shown shows, for example, a background pattern generated in offset printing 13 fine lines (guilloche) and one printed in letterpress Serial number 14. Furthermore, a printed image 15, which represents the number 5, available. This print image 15 is in conventional intaglio printing technology implemented.

Der erfindungsgemäße Aufdruck, der beispielsweise mit einer Druckplatte gemäß Fig. 1 erzeugt werden kann, ist im hier gezeigten Beispiel nur in einem Teilbereich der Banknote vorgesehen und besteht aus einem bedruckten Bereich 16, durch den ein Portraitbild angedeutet wird. Die unterschiedlichen Halbtöne des Bildmotivs werden durch Variation von Linienabstand und/oder Linienbreite wiedergegeben. Dabei entspricht jede im Portrait erscheinende Linie einem erfindungsgemäß gedruckten Strukturelement. Randbereiche und Innenbereich eines jeden Strukturelements grenzen nahtlos aneinander und wurden im Stichtiefdruck mit unterschiedlich dicken Farbschichten gedruckt, wobei der Randbereich eine dickere Farbschicht aufweist als der Innenbereich. Insbesondere bei Verwendung von sehr vielen Linienstrukturen auf dem zu bedruckenden Bereich, d.h. bei sehr hoher Dichte der Linienstrukturen im Druckbild, macht sich der farbeinsparende Effekt beim erfindungsgemäßen Druck deutlich bemerkbar. Ein Bereich mit hoher Liniendichte ist beispielsweise der Haarbereich 17 im Portrait. Geht man weiter davon aus, dass der Haarbereich 17 in einem Portrait je nach Motiv üblicherweise etwa die Hälfte des Portraitfläche einnimmt und das Portrait wiederum etwa die Hälfte bis ein Drittel der Fläche auf der Banknote, ergibt sich bei einer Produktionsleistung von mehreren Milliarden Stück Banknoten eine erhebliche Reduzierung des Druckfarbenverbrauchs und damit der Produktionskosten.The imprint according to the invention, for example with a printing plate 1 can be generated in the example shown here only in one Part of the banknote is provided and consists of a printed Area 16, through which a portrait image is indicated. The different Halftones of the image motif are created by varying the line spacing and / or line width reproduced. Each one that appears in the portrait corresponds Line of a structural element printed according to the invention. The border areas and interior of each structural element border seamlessly to each other and were in intaglio printing with different thicknesses Color layers printed, the edge area a thicker color layer has than the interior. Especially when using a large number Line structures on the area to be printed, i.e. at very high Density of the line structures in the printed image, makes the color-saving The effect of the print according to the invention is clearly noticeable. An area with A high line density is, for example, the hair area 17 in the portrait. going one further assumes that the hair area 17 in a portrait depending on the motif usually takes up about half of the portrait area and the portrait again about half to a third of the area on the banknote, results in a production output of several billion pieces Banknotes a significant reduction in ink consumption and hence the production cost.

Fig. 4 zeigt einen gemäß der Erfindung bedruckten Ausschnitt eines Datenträgerbereichs im Querschnitt wie er sich beispielsweise bei Verwendung der in Fig. 1 gezeigten Druckplatte mit d= 0 µm zum Drucken einzelner Haare, wie sie im Portrait der Fig. 3 angedeutet sind, ergibt. Beim Druckvorgang wird der Datenträger 12 auf die Druckplatte gepresst, wobei der Datenträger 12 durch die auf Grund der Gravur 3 strukturierten Oberfläche der Druckplatte geprägt wird und zugleich die Druckfarbe 22 aus dem Gravurbereich 3 auf die Datenträgeroberseite 18 aufgenommen wird. Als Farbschichtdicke des Randbereichs DR und des Innenbereichs DI wird der Niveauunterschied zwischen der nicht bedruckten Substratoberfläche und den Oberflächen des jeweiligen Farbflächenbereichs 19, 20 oder 21 festgelegt. Der bedruckte Bereich zeichnet sich durch eine Farbschicht aus, die an den Randbereichen dicker als im Innenbereich ist und einen taktil wahrnehmbaren Aufdruck hinterlässt. Vorliegend sind die Farbschichtdicken der Randbereiche 19 und 21 gleich und die Profile keilförmig ausgebildet. Ebenso ist es aber in einer weiteren Ausführungsform möglich, dass die Randbereiche 19 und 21 unterschiedliche Farbschichtdicken und/oder unterschiedliche Profile aufweisen. Je nach Farbschichtdicke zeigen die Druckfarben lasierende bzw. deckende Eigenschaften, so dass die Randbereiche und Innenbereiche dem Betrachter bei sehr großen Farbschichtdicken als homogene Fläche oder bei geringeren Farbschichtdicken als visuell unterscheidbare Bereiche entgegentreten.FIG. 4 shows a section of a data carrier area printed in accordance with the invention in cross section, as is obtained, for example, when using the printing plate shown in FIG. 1 with d = 0 μm for printing individual hairs, as indicated in the portrait in FIG. 3. During the printing process, the data carrier 12 is pressed onto the printing plate, the data carrier 12 being embossed by the surface of the printing plate structured on the basis of the engraving 3, and at the same time the printing ink 22 is picked up from the engraving area 3 onto the upper side of the data carrier 18. The difference in level between the non-printed substrate surface and the surfaces of the respective color area 19, 20 or 21 is defined as the ink layer thickness of the edge area D R and the inner area D I. The printed area is characterized by a layer of color, which is thicker at the edge areas than in the interior and leaves a tactile perceptible print. In the present case, the color layer thicknesses of the edge regions 19 and 21 are the same and the profiles are wedge-shaped. However, it is also possible in a further embodiment that the edge regions 19 and 21 have different ink layer thicknesses and / or different profiles. Depending on the thickness of the ink layer, the printing inks have glazing or opaque properties, so that the edge areas and interior areas face the viewer as a homogeneous surface with very large ink layer thicknesses or as visually distinguishable areas with smaller ink layer thicknesses.

Der Vorteil der erfindungsgemäßen Ausführungsformen besteht darin, dass die gegenüber den Randbereichen verringerte Farbschichtdicke der Innenbereiche zu deutlicher Farbeinsparung führt. Gleichzeitig bleibt jedoch die Taktilität des Druckbildes gewahrt bzw. wird erhöht, da die Randbereiche das Relief des Druckbilds auf Grund der größeren Farbschichtdicke im Vergleich zum Innenbereich verstärken. Insbesondere bei der Ausführungsform, bei der deckende Farben eingesetzt werden, macht sich der farbeinsparende Effekt bemerkbar. Ab einer gewissen Farbschichtdicke verändert sich der visuelle Eindruck des Farbtones nicht mehr, d.h. auch bei dickerem Farbauftrag wird das Druckbild nicht dunkler sondern hat einen Sättigungswert erreicht. Um einen homogenen Farbeindruck zu erzeugen, reicht es also aus, den Innenbereich gerade so dick zu bedrucken, dass der dunkelst mögliche Farbton erzeugt wird. Die dabei gesparte Druckfarbe reduziert die Produktionskosten erheblich.The advantage of the embodiments according to the invention is that the reduced color layer thickness of the inner areas compared to the edge areas leads to significant color savings. At the same time, tactility remains of the printed image is maintained or increased since the marginal areas Relief of the printed image due to the larger ink layer thickness in comparison reinforce to interior. Especially in the embodiment, at the opaque colors are used, the color-saving effect makes itself felt noticeable. From a certain color layer thickness, the visual changes Impression of the color no longer, i.e. even with thicker paint application the printed image does not become darker but has reached a saturation value. To create a homogeneous color impression, it is therefore sufficient to use the interior to print just so thick that the darkest possible color is produced. The printing ink saved thereby reduces the production costs considerably.

Claims (21)

  1. An intaglio printing plate for producing a printed image with at least one engraved area in the plate surface, characterized in that the engraved area has one or more structural elements in which the edge area has a greater engraving depth than the inside area, the edge area and the inside area are directly adjacent, and the inside area is designed as a plateau that is lowered relative to the plate surface.
  2. A printing plate according to claim 1, characterized in that the edge area is designed to be wedge-shaped or trapezoidal.
  3. A printing plate according to claim 1, characterized in that the edge area is designed as a wedge with a round tip.
  4. A printing plate according to any of claims 1 to 3, characterized in that the surface of the inside area is provided with a basic roughness pattern as an ink trap.
  5. A printing plate according to any of claims 1 to 4, characterized in that the edge area has an engraving depth tR of 60 microns to 150 microns, preferably 100 microns to 150 microns.
  6. A printing plate according to any of claims 1 to 5, characterized in that the inside area has an engraving depth tl of 10 microns to 120 microns, preferably 60 microns to 100 microns.
  7. A printing plate according to any of claims 1 to 6, characterized in that the edge area and the inside area each have an engraving depth at which all printed areas in the printed image have the same color tone when viewed with the naked eye.
  8. A printing plate according to any of claims 1 to 7, characterized in that the edge area has an engraving width b of 120 microns to 500 microns and an engraving width of the base surface d of 0 to 500 microns.
  9. A printing plate according to any of claims 1 to 8, characterized in that the structural element is designed in the form of a character and/or pictorial symbol.
  10. A printing plate according to any of claims 1 to 8, characterized in that the structural element is designed in the form of a line.
  11. A printing plate according to claim 10, characterized in that the line has a width α of 0.1 millimeters to 5 millimeters, preferably 0.5 millimeters to 3 millimeters.
  12. A data carrier with a printed image produced by intaglio comprising at least one printed image area having an ink layer, characterized in that the printed image area has one or more printed structural elements in which the ink layer thickness is greater in the edge area than in the inside area, and the ink layer in the inside area is designed as a plateau that is lowered relative to the ink layer of the edge area.
  13. A data carrier according to claim 12, characterized in that the ink layer thickness difference between edge area and inside area is tactilely perceptible.
  14. A data carrier according to claim 12 or 13, characterized in that the edge area is designed to be wedge-shaped or trapezoidal.
  15. A data carrier according to any of claims 12 to 14, characterized in that the edge area and the inside area have the same color tone.
  16. A data carrier according to any of claims 12 to 14, characterized in that the edge area has a darker color tone than the inside area.
  17. A data carrier according to any of claims 12 to 16, characterized in that the printed structural element is designed in the form of a character and/or pictorial symbol.
  18. A data carrier according to any of claims 12 to 16, characterized in that the structural element is designed in the form of a line.
  19. A data carrier according to claim 18, characterized in that the line has a width of 0.1 to 5 millimeters, preferably 0.5 millimeters to 3 millimeters.
  20. A method for producing an intaglio printing plate for printing a surface by intaglio comprising the following steps:
    providing a printing plate with a printing plate surface, and
    engraving at least one engraved area in the printing plate surface by means of an engraving tool so that the engraved area has one or more structural elements in which the edge area has a greater engraving depth than the inside area, the edge area and the inside area are directly adjacent, and the inside area is designed as a plateau that is lowered relative to the printing plate surface.
  21. An intaglio printing process for printing a printed image wherein a printing plate according to any of claims 1 to 11 is used.
EP01962997A 2000-09-08 2001-09-05 Gravure printing plate and valuable document produced by the same Revoked EP1317349B1 (en)

Applications Claiming Priority (3)

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DE10044711 2000-09-08
DE10044711A DE10044711A1 (en) 2000-09-08 2000-09-08 value document
PCT/EP2001/010227 WO2002020279A1 (en) 2000-09-08 2001-09-05 Gravure printing plate and valuable document produced by the same

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EP1317349B1 true EP1317349B1 (en) 2004-06-23

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EP (1) EP1317349B1 (en)
JP (1) JP2004508227A (en)
CN (1) CN1244457C (en)
AT (1) ATE269791T1 (en)
AU (2) AU2001284053B2 (en)
BR (1) BR0113769B1 (en)
CA (1) CA2421099C (en)
DE (2) DE10044711A1 (en)
ES (1) ES2223001T3 (en)
HK (1) HK1059419A1 (en)
MX (1) MXPA03002016A (en)
PL (1) PL199462B1 (en)
PT (1) PT1317349E (en)
RU (1) RU2258613C2 (en)
TR (1) TR200401898T4 (en)
WO (1) WO2002020279A1 (en)
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EP1317349A1 (en) 2003-06-11
AU8405301A (en) 2002-03-22
RU2258613C2 (en) 2005-08-20
US20040025728A1 (en) 2004-02-12
PL359718A1 (en) 2004-09-06
DE10044711A1 (en) 2002-03-21
CA2421099A1 (en) 2003-03-04
ATE269791T1 (en) 2004-07-15
WO2002020279A1 (en) 2002-03-14
AU2001284053B2 (en) 2005-10-27
BR0113769B1 (en) 2010-12-14
PT1317349E (en) 2004-10-29
ES2223001T3 (en) 2005-02-16
CN1452565A (en) 2003-10-29
TR200401898T4 (en) 2004-09-21
JP2004508227A (en) 2004-03-18
CN1244457C (en) 2006-03-08
DE50102693D1 (en) 2004-07-29
CA2421099C (en) 2008-12-30
MXPA03002016A (en) 2004-05-04
BR0113769A (en) 2003-07-29
US7104193B2 (en) 2006-09-12
PL199462B1 (en) 2008-09-30
AU2001284053A2 (en) 2002-03-22
HK1059419A1 (en) 2004-07-02
ZA200301455B (en) 2004-02-17

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