EP3501840B1 - Procédé de fabrication d'un élément de sécurité en feuilles multicouche - Google Patents

Procédé de fabrication d'un élément de sécurité en feuilles multicouche Download PDF

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Publication number
EP3501840B1
EP3501840B1 EP18000984.7A EP18000984A EP3501840B1 EP 3501840 B1 EP3501840 B1 EP 3501840B1 EP 18000984 A EP18000984 A EP 18000984A EP 3501840 B1 EP3501840 B1 EP 3501840B1
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EP
European Patent Office
Prior art keywords
layer
embossing
colored
film
print
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP18000984.7A
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German (de)
English (en)
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EP3501840A1 (fr
Inventor
Winfried HOFFMÜLLER
Manfred Heim
Maik Rudolf Johann Scherer
Michael Rahm
Raphael DEHMEL
Giselher Dorff
Theodor Burchard
Björn Teufel
Christian Fuhse
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giesecke and Devrient Currency Technology GmbH
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Giesecke and Devrient Currency Technology GmbH
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Publication of EP3501840A1 publication Critical patent/EP3501840A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/43—Marking by removal of material
    • B42D25/44—Marking by removal of material using mechanical means, e.g. engraving
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/425—Marking by deformation, e.g. embossing

Definitions

  • the invention relates to methods for producing a multilayer film security element and, in particular, relates to the production of a multilayer film security element with a structured metallized embossed structure with recesses, in which the metallized areas of the embossed structure are at least partially colored on at least one side of the security element.
  • Data carriers such as documents of value or identity documents, but also other objects of value, such as branded articles, are often provided with security elements for security purposes, which allow the authenticity of the data carrier to be checked and which at the same time serve as protection against unauthorized reproduction.
  • Transparency security features such as transparency windows in banknotes, are becoming increasingly attractive.
  • a film provided with an adhesive layer on one side is applied to a banknote in order to close a continuous opening previously made there.
  • the film is typically provided with a security feature, such as a hologram or an optically variable coating, and thus forms a film security element.
  • Double-sided diffraction-optical security elements with cutouts are, for example, from the publications EP 1 476 315 B1 , EP 1 458 585 B1 , EP 2 448 766 B1 or EP 2 448 767 B1 known.
  • document DE 10 2015 010 744 A1 discloses a method for producing a multilayer film security element for security papers, documents of value and other data carriers, wherein the film carrier is first provided with embossing lacquer and then the film carrier is provided with the motif print.
  • security foils which carry a metallized embossed structure with cutouts and in which the metallized areas of the embossed structure are at least partially colored on at least one side of the security element.
  • the production of such security films is currently very complex and requires several exposure steps and very well controlled manufacturing conditions.
  • the present invention is based on the object of specifying simple and inexpensive methods for the production of film security elements of the type mentioned at the outset.
  • register fluctuations are technically unavoidable even with registered application or embossing.
  • Typical register fluctuations when using different printing / embossing units of a printing press are in the order of 0.1 mm.
  • the typical register fluctuations are of the order of magnitude of 0.2 mm.
  • the indication that the soluble wash color is applied in the register complementary to the motif print means that the wash color is registered on the one hand and applied to the motif print, but that, within the registration accuracy, this only happens in areas where there is no motif print. Motif print and wash color are then complementary to each other.
  • one or more metal layers for example aluminum, chromium, copper or alloys of these metals, are applied as the metallization coating.
  • a multilayer structure in particular with a layer sequence of metal1, dielectric spacer layer, metal2, can be applied with particular advantage as the metallization coating.
  • the multilayer structure contains an ultra-thin dielectric spacer layer with a thickness below 250 nm, in particular between 50 nm and 250 nm, in order to reflect and / or transmission to generate a fixed color.
  • the multilayer structure can also contain a thicker dielectric spacer layer with a thickness above 250 nm, with a color-shifting multilayer structure typically being produced by interference effects.
  • the multilayer construction can particularly advantageously contain a dielectric spacer layer with a locally varying layer thickness in order to produce locally different color impressions (different fixed color impressions and / or different tilting-dependent color impressions) in reflection and / or transmission.
  • the dielectric spacer layer of the multilayer structure can be vapor-deposited like the metal layers, but is advantageously printed on.
  • the film security element is subjected to the said washing step after the metallization coating has been applied, the washing color being washed off with the layer regions of the metallization coating arranged above the washing color in the washing step.
  • a water-soluble wash color and water as the solvent can be used in all configurations.
  • the metallization coating is provided with a second colored motif print before the washing step, which is preferably applied in register with the first colored motif print.
  • the film security element is then advantageously subjected to the above-mentioned washing step after the second colored motif print has been applied, the wash color advantageously being washed off by a solvent with all the layer regions of the metallization coating and the second colored motif print arranged above the wash color.
  • the film security element is subjected to the washing step mentioned after the second colored motif print has been applied during the washing step, the washing color is washed off only in the areas not provided with the second colored motif print with the layer areas of the metallization coating arranged above the washing color.
  • the embossing lacquer layer is provided with an embossed structure in the register for the motif print, and the soluble wash color is registered but applied in a complementary manner to the embossed structure.
  • the embossing lacquer layer is advantageously applied over the entire surface.
  • a hologram, a micromirror structure, a microcavity structure, a microlens structure, nanostructures or Fresnel structures, in particular Fresnel concave mirrors or Fresnel concave mirrors, are advantageously embossed into the embossing lacquer layer as the embossing structure.
  • the film carrier is advantageously pretreated for printing and the colored motif print is applied to a pretreated surface of the film carrier.
  • the first colored motif print provided on the film carrier and / or the second colored motif print on the metallization coating are advantageously carried out with chromatic colors, in particular with glazed chromatic colors.
  • the embossing structure of the embossing lacquer layer is preferably metallized over the entire surface.
  • One or more metal layers, but also multi-layer structures of the type described above, are suitable for the metallization.
  • the structured motif prints can each be printed with differently colored printing inks, wherein in particular the printing inks applied to the metallized embossing lacquer layer can also be partially colorless.
  • the film carrier can also be provided in a second step on the other side with a second colored photoresist layer in the form of a desired motif.
  • the second photoresist layer is then also exposed from the side of the film carrier opposite it, the metallizations of the structured functional coating acting as an exposure mask.
  • the exposed second photoresist is then developed to produce color areas matched to the structured functional coating.
  • the photoresist (s) can in particular be mixed with soluble dyes or color pigments.
  • structured resist material can also be colored by bringing a resist into a sticky state under the influence of pressure and / or temperature and bringing the sticky resist into contact with a colorant, such as color pigments.
  • FIG. 1 shows a schematic representation of a banknote 10 with a security element according to the invention in the form of a glued-on film strip 12, which covers a continuous opening 14 in the banknote paper.
  • a colored and at the same time shiny metallic motif 16 is visible, which is shown in the embodiment in the form of a maple leaf.
  • a special feature of the film strip 12 is that the motif 16 appears in the window 14 from the opposite sides of the bank note 10, each with a metallic sheen, but with a different color.
  • a polyester film 22 with a thickness between 6 ⁇ m and 36 ⁇ m is first provided.
  • the polyester film 22 preferably has a thickness of approximately 12 ⁇ m and is pretreated for good adhesion of the applied layers on one side (reference numeral 24).
  • a desired colored motif print 28 is applied with printing inks 26 to the pre-treated side of the polyester film 22, it being possible to use any printing method, such as gravure printing or flexographic printing.
  • the printing inks 26 can be aqueous, solvent-based and / or, particularly preferably, UV-crosslinking.
  • the printing can also be multi-colored and can be carried out with several printing units. Intermediate curing or intermediate drying of printing inks first applied may also be necessary.
  • embossing lacquer layer 30 is then printed on the colored motif print 28, the printing preferably taking place over the entire area, so that no special register requirements are imposed on the embossing lacquer printing.
  • the embossing lacquer can be a thermoplastic embossing lacquer, but the use of a UV embossing lacquer is currently preferred.
  • the embossing lacquer layer 30 is provided with an embossing 32, which in the exemplary embodiment shown is in register with the colored motif print 28, that is to say the partial areas printed with printing inks 26.
  • the embossing can be, for example, a hologram, a micromirror structure, a microcavity structure, a microlens structure, nanostructures or Fresnel structures.
  • a washing ink 34 is printed on the embossing 32 in a complementary manner, that is to say essentially precisely in the unembossed areas of the embossing lacquer layer 30, so that the ink in FIG Fig. 2 (a) shown layer sequence arises. All the steps described so far are carried out in a single operation, so that a register accuracy of about 0.1 mm can be achieved.
  • the embossing 32 can also extend beyond the colored motif print 26 or even extend over the entire embossing lacquer layer 30. It is only essential that the wash color 34 is applied in the register complementary to the colored motif print 26.
  • Fig. 2 (b) the embossing lacquer layer 30 and the washing ink 34 are now provided with a metal layer 38 over the entire surface in a second operation. Then a second colored motif print 40 with second printing inks 36 is printed on the metal layer 38.
  • the second colored motif print 40 can also be multicolored and can be done with aqueous, solvent-based and / or UV-curing printing inks. However, the colors of the second motif print 40 preferably differ at least partially from the colors of the first motif print 26, so that different color impressions arise.
  • the second colored motif print 40 can be printed in an insetter process registered to the first colored motif print 28, register accuracy of about 0.2 mm can be achieved.
  • the resulting sequence of layers is in Fig. 2 (b) shown.
  • a washing step is now carried out, in which the washing ink 34 with the regions of the metal layer 38 arranged above it and the regions of the second printing inks 36 arranged above it is removed, so that the in FIG Fig. 2 (c) shown situation arises.
  • the washing step creates a perfect registration of the remaining areas 42 of the metal layer 38 with the embossing 32 and with the remaining areas 44 of the second colored motif print 40.
  • the result is a film strip 20 in which a metallized embossed structure 32, 42 is arranged in register with a colored first motif print 28 and colored areas 44 of a second motif print 40.
  • the color areas 44 are visible from the top of the film strip 20, and the color areas 26 from the bottom.
  • the color areas 26 and 44 are separated by the metallized embossed structure 32, 42 in each case.
  • the registration of the color areas 44 to the metallized embossed structure 32, 42 and thus to the color areas 26 may be complete (center of the picture, reference symbol 45A), or may also extend only to a part of the outline of the color regions 26 (left side of the picture, reference symbol 45B) .
  • the color areas 44 can in this way be formed in a pattern, such as a stripe pattern, dot or line pattern, and yet be matched with the color areas 26 along their outer contours. Areas can also be provided without a second printing ink 36, in which the film strip 20 shows the purely metallic appearance of the metallized embossing structure 32, 42 from the top (right side of the picture, reference symbol 45C).
  • the second printing ink 36 can also be such that it is not removed together with the metallization 38 in the washing step.
  • the area covered by the second printing ink 36 can always lie within the embossing 32, so that colored areas with a metallic edge remain after the washing step.
  • an etching process can also be used for structuring the metal layer 38, as now with reference to FIG Fig. 3 explained.
  • a polyester film is used first 22 is provided, which is preferably print-pretreated on one side (reference numeral 24).
  • a desired colored motif print 28 with printing inks 26 is then printed on the pre-treated side of the polyester film 22 and a full-surface embossing lacquer layer 30 is printed thereon.
  • the embossing lacquer layer 30 is provided with an embossing 32, which is in register with the colored motif print 28, and the embossed lacquer layer 30 is finally provided with a metal layer 38 over the entire surface.
  • a resist varnish 50 is printed in the insetter for embossing 32 and a second colored motif print 52 with one or more second chromatic colors 54 is printed on it, so that the in Fig. 3 (a) layer sequence shown arises.
  • the colored inks 54 can be printed on after the resist lacquer 50 and show good adhesion to the resist lacquer 50, but relatively poor resist action on the metal layer 38.
  • the partial areas of the colored ink 54 that are not on the resist 50 are infiltrated by the etching medium and can be washed off at the latest when the etched film is rinsed. Brushes, high-pressure nozzles, rotating felts and the like can be used to support the detachment.
  • the etching step creates a design as in Fig. 3 (b) shown, in which the chromatic colors 54 are arranged with the resist varnish 50.
  • the inventors have also recognized that in etching processes at elevated temperatures from approximately 50 ° C., there is sometimes a complete loss of adhesion of resist lacquers, although the resist effect of the formulations is very good per se. This effect is currently explained in such a way that some resist lacquers represent a good barrier against the liquid etching medium, but not a sufficient one Form a barrier against gases and the etching medium, which can contain water and alcohols for example, already develops a noticeable vapor pressure at temperatures above 50 ° C. Taking advantage of this effect, with a suitable choice of the chromatic colors 54, the chromatic color that is already protruding through a simple etching process can be removed from the film together with the metallization 38.
  • the colored ink 54 can be printed both before and after a colorless resist 50. Alternatively, the colored ink 54 itself can also represent a resist lacquer, which also results in the desired registration during the etching.
  • the film 22 can also be provided on one of its sides with a pressure acceptance layer, which can be applied at any time and advantageously in one layer or with a primer.
  • a pressure acceptance layer which can be applied at any time and advantageously in one layer or with a primer.
  • motifs in chromatic colors can be printed underneath them in the case of printing the ink acceptance layer on the film side.
  • primers and heat seal lacquers can be printed on the opposite side.
  • colored colors, effect colors and fluorescent colors can be provided as intermediate layers.
  • the heat seal lacquers used can also be equipped with fluorescent substances.
  • Figure 4 illustrates the production of a film that can be used as a transfer strip and is well suited, for example, for paper-film composite substrates and polymer substrates.
  • a film is first provided which enables a reliable release (or a reliable detachment) of the applied layer structure, for example a good quality polyester film 62 without pre-treatment.
  • the polyester film 62 can be coated with a first uniform layer, for example a UV-crosslinking lacquer layer 64.
  • the desired colored motif print 28 is then in principle with printing inks 26 on the lacquer layer 64 in the Fig. 2 already printed type.
  • the motif print 28 is also analogous to Fig. 2 , an embossing lacquer layer 30 is printed on, and this is provided with an embossing 32 which is in register with the colored motif print 28, that is to say the partial areas printed with printing inks 26.
  • the embossing 32 is registered on the embossing 32 in a complementary manner, that is to say precisely in the unembossed areas of the embossing lacquer layer 30, washing ink 34.
  • a metallization coating 66 in the simplest case being a metal layer, for example an aluminum layer, optionally with chrome plating, or a chrome-aluminum-chrome structure.
  • the metallization coating 66 can also be a multilayer structure which, in addition to one or more metal layers, also contains other types of layers, in particular dielectric spacer layers.
  • the multi-layer structure can be a color-shifting thin-layer structure (e.g.
  • the metallization coating 66 can be applied in several sub-steps and that some layers, for example the dielectric layer of a multilayer structure, can also be printed on. After the metallization coating 66 has been produced, it lies in FIG Fig. 4 (a) shown sequence of layers.
  • a washing step is then carried out in which the washing ink 34 with the regions of the metallization coating 66 arranged above it is removed. This creates a perfect registration of the remaining areas 68 of the metallization coating 66 with the embossing 32 and with the color areas 26 of the first motif print 28. Subsequently, primer layers 70 and heat-sealing lacquers 72 can be printed so that the in Fig. 4 (b) layer sequence shown results.
  • the metallization coating 66 can in particular produce a color shift effect or a fixed color. As a result, a film strip 60 is obtained in which the color effect of the metallization coating 66 is arranged in register with the colored first motif print 28.
  • the remaining areas 68 of the metallization coating 66 can be seen from the top of the film strip 60, and the color areas 26 from the bottom.
  • the carrier film 62 can be removed again after the layer sequence has been transferred to a target substrate.
  • Figure 5 (a) shows a representation like Fig. 4 (a) for a variant in which the metallization coating 66 is designed as a three-layer structure with a first metallization 74, a printed dielectric 76 and a second metallization 78.
  • the dielectric 76 is printed as a motif, the printing being as complementary as possible to the wash color printing 34, which can be implemented, for example, using an insetter process.
  • the layer thickness of the dielectric 76 does not have to be constant either, but can be varied locally in a targeted manner, as in FIG Fig. 5 (a) illustrated using two different layer thicknesses. In this way, thin-film elements with different fixed colors and / or different color shift effects can be realized.
  • the different layer thicknesses can be achieved, for example, by different cup geometries can be realized in gravure printing. Since the dielectric 76 is also printed with a single cylinder in the case of different layer thicknesses, the regions of different layer thickness and thus the regions with different color effects are perfectly matched to one another. A second metallization 78 is then applied, which may consist of the same or a different metal as the first metallization 74.
  • the washing ink 34 with the regions of the metallization coating 66 arranged above it is then removed and the primer layers 70 and the heat seal lacquers 72 are printed, so that the in Fig. 5 (b) layer sequence shown results.
  • the remaining areas 68 of the metallization coating 66 are visible with their different color effects generated by the thickness variation of the dielectric layer 76, and the color areas 26 from the underside in perfect register.
  • the carrier film 62 can be transferred after the layer sequence has been transferred be pulled off on a target substrate.
  • FIG. 6 illustrates the production of a film that is to be applied as a film strip 80 to a substrate with a see-through window, the carrier film of the security element being intended to remain in the product.
  • a PET carrier film 22 is provided, which has been provided with an embossing lacquer layer 30 with desired embossments 32 on a print-pretreated side (reference number 24).
  • the embossed embossing lacquer layer 30 was then metallized with a metal layer 38.
  • a fit motif print with the first printing inks 82 or second printing inks 84 are applied, the printing inks 82 applied to the metallized side being formulated as a resist.
  • These resist printing inks 82 comprise one or more chromatic inks 82A, but can also contain colorless printing inks 82B which do not have a color effect themselves but only serve as a resist.
  • the printing colors 84 on the non-metallized side represented one or more different chromatic colors.
  • an etching step is performed by which the metal layer 38 is removed from the areas not covered with resist inks 82 (82A, 82B), so that a perfect fit between the remaining areas 86 of the metal layer 38 and the inks 82 (82A, 82B) ) of the metallized side or the printing inks 84 of the non-metallized side is produced, as in Fig. 6 (b) shown.
  • the printing inks 82, 84 present on the opposite sides are always separated from one another by a fitted metal area 86 and can produce shiny metallic appearances of different colors from opposite sides.
  • the purely metallic appearance of the metal layer 38 is visible from the top at the points at which the printing ink 82 is formed not by a colored ink 82A but by a colorless resist 82B.
  • a film which carries two mutually independent metallized embossments, for example two reflection holograms, which are visible from opposite sides of the film.
  • the metalized embossings are precisely matched to each other, at least in some areas, so that when viewed from one side only exactly one motif is visible.
  • the metallized embossments are provided with matched layers of colored ink.
  • a film structure can be produced, for example, using a metal transfer process, as described, for example, in the publications WO 2011/138039 A1 , EP 2 340 175 B1 , EP 2 321131 B1 or EP 2 874 823 B1 is described. To this extent, the disclosure content of the cited documents is included in the present application.
  • a photoresist 112 which has been colored in the desired manner, is applied to the metallized side of the carrier film 22 in the form of a desired motif.
  • the resist 112 can be mixed with soluble dyes, for example dyes from the Orasol or Neozapon series, or else with color pigments.
  • the resist 112 is exposed from the side opposite the metallizations 104, 110 (reference numeral 114), the metallizations 104, 110 acting as an exposure mask, so that only the regions of the resist arranged in non-metallized subregions of the film structure 112 are exposed sufficiently strong.
  • the exposure is particularly advantageous with LED spotlights, since the moisture required for this step remains to a greater extent in the resist layer 112 with low heat input.
  • the exposed photoresist 112 is then removed in a developer solution, so that the in Fig. 7 (c)
  • the film structure shown arises in which the remaining colored resist areas 116 are matched to the metallized partial areas 104, 110.
  • the photoresist 112 can also be applied to the side 124 of the carrier film 22 opposite the metallized side, the exposure then taking place from the metallized side, so that the metallizations 104, 110 again act as an exposure mask.
  • the metallized partial areas 104, 110 and the pass resist areas remaining after development are then present on opposite sides of the carrier film 22.
  • both sides of the carrier film 22 with additional structured bright color layers.
  • a further colored photoresist 118 is exposed from the side of the metallizations 104, 110 (reference numeral 120), so that the metallizations again act as an exposure mask.
  • the film can be coated on one side with developer solution and washed accordingly.
  • Another possibility is to postexpose the photoresist 116 by exposure to a UV lamp, which also brings about a considerable heat input, and thus to reduce its solubility.
  • the photoresist 116 can be exposed by appropriate metering in the exposure step 120 in such a way that it dries out to such an extent that it no longer becomes soluble due to the exposure, while the photoresist 118, shielded by the intermediate layer structure, becomes soluble. This effect can be supported by the choice of the pigmentation of the two photoresist layers 116, 118.
  • the one-sided or two-sided film structures of the Figures 7 (c) or 7 (e) can be equipped in the usual way with ink acceptance layers and heat seal lacquers or processed in another way.
  • Figure 8 illustrates further production variants of film security elements which are to be applied over a viewing window and in which the carrier film of the security element is to remain in the product.
  • a carrier film 22 is provided with an embossing lacquer layer 30 and an embossed embossing structure 32.
  • a wash color 132 in the form of a desired motif is printed on the embossed embossing lacquer layer 30, and a colored photoresist 134 is applied to the side of the carrier film 22 opposite the embossing lacquer layer 30.
  • the wash color 132 contains as Filler, for example, between 1% and 30% titanium dioxide and may contain other UV absorbers.
  • the photoresist 134 is exposed from the side of the carrier film 22 provided with the wash color 132 (reference symbol 136), the motif formed by the wash color 132 acting as an exposure mask. Then the photoresist 134 is developed, depending on the type of photoresist 134 used either the exposed areas 138 remain, as in the variant of FIG Fig. 8 (b) shown (negative resist), or the unexposed areas 140 remain, as in the variant of FIG Fig. 8 (d) shown (positive resist).
  • the side of the carrier film 22 provided with the washing color 132 is provided with a desired coating at any time after the exposure of the photoresists 134, for example coated or vapor-coated with metals and / or other layers.
  • the wash color is then removed in a washing process with the parts of the coating arranged above it.
  • the result is a film security element 130, in which the areas 142 of the coating remaining after the washing step are arranged with a precise fit to the remaining areas 138 and 140 of the photoresist 134.
  • the remaining coating areas 142 are congruent with the remaining photoresist areas 138, as in FIG Fig. 8 (c) is shown, while in the variant with positive resist the remaining coating regions 142 and the remaining photoresist regions 138 are arranged complementarily to one another, as in FIG Fig. 8 (e) shown.
  • Figure 9 describes an exemplary embodiment in which a film security element 150 is provided with a structured colored layer using a transfer method.
  • a carrier film 22 is provided, which is provided on one side with an embossing lacquer layer 30 with an embossing structure 32 and a structured metallization 152.
  • the structured metallization 152 can be produced, for example, with the aid of a washing process or a resist-based etching process, as already described several times above.
  • a colored photoresist 154 is applied to the side of the carrier film 22 opposite the metallization 152 and is converted into a soluble form by exposure 156 from the metallized side of the carrier film 22.
  • the structured metallization 152 acts as an exposure mask.
  • the photoresist 154 is developed and structured in such a way that the remaining regions 158 of the photoresist are arranged congruently with the structured metallization 152, as in FIG Fig. 9 (b) shown.
  • the photoresist 154 is selected such that it becomes sticky under pressure and / or temperature and can take on color 160 in different ways. For example, by printing on a suitable ink ribbon, it can be achieved that ink 160 is preferably transferred to the resist 158 and not to the embossing lacquer 30, as in FIG Fig. 9 (c) shown.
  • the result of such a transfer process is a film security element 150, in which the resist regions 158 coated with paint 160 are arranged precisely to match the structured metallization 152.
  • the element can be further processed in the manner already described above.

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Claims (15)

  1. Procédé de fabrication d'un élément de sécurité en feuilles multicouche (12) pour des papiers de sécurité (10), documents de valeur et autres supports de données, pour lequel
    - un support de feuille (22) est préparé et est doté d'une impression de motif en couleur (26),
    - le support de feuille imprimé est doté d'une couche de laque de gaufrage (30),
    et la couche de laque de gaufrage est dotée d'une structure en relief (32),
    - une laque de lavage soluble (34) est appliquée dans le registre en complément de l'impression de motif sur la couche de laque de gaufrage,
    - la couche de laque de gaufrage avec la laque de lavage appliquée est revêtue d'un revêtement de métallisation (38), et
    - la couche de laque de gaufrage revêtue est soumise à une étape de lavage, au cours de laquelle la laque de lavage est nettoyée par lavage par un solvant avec au moins une partie des zones de couche disposées sur la laque de lavage.
  2. Procédé selon la revendication 1, caractérisé en ce qu'une ou plusieurs couches métalliques sont appliquées en tant que revêtement de métallisation.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce qu'une structure multicouche, en particulier avec une suite de couches Métal 1, une couche d'espacement diélectrique, Métal 2, est appliquée en tant que revêtement de métallisation.
  4. Procédé selon la revendication 3, caractérisé en ce que la structure multicouche contient une couche d'espacement ultrafine diélectrique avec une épaisseur inférieure à 250 nm pour représenter une couleur fixe en réflexion et/ou en transmission.
  5. Procédé selon la revendication 3 ou 4, caractérisé en ce que la structure multicouche contient une couche d'espacement diélectrique avec une épaisseur de couche variant localement pour produire des impressions de couleur localement différentes en réflexion et/ou en transmission.
  6. Procédé selon au moins l'une quelconque des revendications 3 à 5, caractérisé en ce que la couche d'espacement diélectrique de la structure multicouche est surimprimée.
  7. Procédé selon au moins l'une quelconque des revendications 1 à 6, caractérisé en ce que l'élément de sécurité en feuilles est soumis après l'application du revêtement de métallisation à l'étape de lavage lors de laquelle la laque de lavage est nettoyée par lavage avec les zones de couche du revêtement de métallisation disposées sur la laque de lavage.
  8. Procédé selon au moins l'une quelconque des revendications 1 à 6, caractérisé en ce que le revêtement de métallisation est doté avant l'étape de lavage d'une deuxième impression de motif en couleur, qui est appliquée de préférence dans le registre à la première impression de motif en couleur.
  9. Procédé selon la revendication 8, caractérisé en ce que l'élément de sécurité en feuilles est soumis après l'application de la deuxième impression de motif en couleur à une étape de lavage au cours de laquelle la laque de lavage avec toutes les zones de couche du revêtement de métallisation disposées sur la laque de lavage et de la deuxième impression de motif en couleur est nettoyée par lavage par un solvant.
  10. Procédé selon la revendication 8, caractérisé en ce que l'élément de sécurité en feuilles est soumis après l'application de la deuxième impression de motif en couleur à une étape de lavage au cours de laquelle la laque de lavage est nettoyée par lavage uniquement dans les zones non dotées de la deuxième impression de motif en couleur avec les zones de couche du revêtement de métallisation disposées sur la laque de lavage.
  11. Procédé selon au moins l'une quelconque des revendications 1 à 10, caractérisé en ce que la couche de laque de gaufrage est dotée d'une structure en relief dans le registre pour l'impression de motif et la laque lavable soluble est enregistrée, mais est appliquée en complément de la structure en relief.
  12. Procédé selon au moins l'une quelconque des revendications 1 à 11, caractérisé en ce que la couche de laque de gaufrage est appliquée sur toute la surface.
  13. Procédé selon au moins l'une quelconque des revendications 1 à 12, caractérisé en ce qu'un hologramme, une microstructure spéculaire, une microstructure cavitaire, une microstructure lenticulaire, des nanostructures ou des structures de Fresnel, en particulier des miroirs creux de Fresnel ou des miroirs bombés de Fresnel, sont empreints dans la couche de laque de gaufrage en tant que structure en relief.
  14. Procédé selon au moins l'une quelconque des revendications 1 à 13, caractérisé en ce que le support de feuille est prétraité pour l'impression et l'impression de motif en couleur est appliquée sur une surface du support de feuille, prétraitée pour l'impression.
  15. Procédé selon au moins l'une quelconque des revendications 1 à 14, caractérisé en ce que la première et/ou la deuxième impression de motif en couleur a lieu avec des couleurs chromatiques, en particulier avec des encres de couleur lasurantes.
EP18000984.7A 2017-12-21 2018-12-19 Procédé de fabrication d'un élément de sécurité en feuilles multicouche Active EP3501840B1 (fr)

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CN115497403A (zh) * 2022-05-20 2022-12-20 苏州苏大维格科技集团股份有限公司 一种多色立体动态图像的可签注防伪证卡及其制备方法

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DE10161532A1 (de) 2001-12-14 2003-07-10 Bosch Gmbh Robert Verfahren und Vorrichtung zur fahrstreckenabhängigen Fahrzeugbeeinflussung
DE10206357A1 (de) 2002-02-14 2003-08-28 Giesecke & Devrient Gmbh Sicherheitselement und Sicherheitsdokument mit einem solchen Sicherheitselement
DE102008036481A1 (de) 2008-08-05 2010-02-11 Giesecke & Devrient Gmbh Verfahren zur Herstellung von Sicherheitselementen mit zueinander gepasserten Motiven
DE102008036480A1 (de) 2008-08-05 2010-02-11 Giesecke & Devrient Gmbh Verfahren zur Herstellung von Sicherheitselementen mit gepasserten Motivschichten
DE102009031386A1 (de) 2009-07-01 2011-01-05 Giesecke & Devrient Gmbh Sicherheitselement und Herstellungsverfahren dafür
DE102009031387A1 (de) 2009-07-01 2011-01-05 Giesecke & Devrient Gmbh Sicherheitselement und Herstellungsverfahren dafür
US8436587B2 (en) 2010-05-05 2013-05-07 Ove T. Aanensen Bipolar overvoltage battery pulser and method
DE102010019766A1 (de) * 2010-05-07 2011-11-10 Giesecke & Devrient Gmbh Verfahren zur Erzeugung einer Mikrostruktur auf einem Träger
DE102012014294A1 (de) 2012-07-19 2014-01-23 Giesecke & Devrient Gmbh Verfahren zur Herstellung eines mehrschichtigen Sicherheitselements
DE102015010744A1 (de) * 2015-08-17 2017-02-23 Giesecke & Devrient Gmbh Sicherheitselement, Verfahren zum Herstellen desselben und mit dem Sicherheitselement ausgestatteter Datenträger

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EP3501840A1 (fr) 2019-06-26

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