EP3501841A1 - Élément de sécurité en feuille et procédé de fabrication - Google Patents

Élément de sécurité en feuille et procédé de fabrication Download PDF

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Publication number
EP3501841A1
EP3501841A1 EP18000985.4A EP18000985A EP3501841A1 EP 3501841 A1 EP3501841 A1 EP 3501841A1 EP 18000985 A EP18000985 A EP 18000985A EP 3501841 A1 EP3501841 A1 EP 3501841A1
Authority
EP
European Patent Office
Prior art keywords
metallization
laser
layer
color
structured
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.)
Granted
Application number
EP18000985.4A
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German (de)
English (en)
Other versions
EP3501841B1 (fr
Inventor
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
Original Assignee
Giesecke and Devrient Currency Technology GmbH
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Publication of EP3501841A1 publication Critical patent/EP3501841A1/fr
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Publication of EP3501841B1 publication Critical patent/EP3501841B1/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
    • B42D25/435—Marking by removal of material using electromagnetic radiation, e.g. laser
    • 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
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/373—Metallic materials

Definitions

  • the invention relates to a multilayer film security element for security papers, documents of value and other data carriers, an associated manufacturing method and a data carrier with such a multilayer film security element.
  • Data carriers such as value documents or identity documents, but also other valuables, such as branded articles, are often provided with security elements for securing purposes, which permit a verification of the authenticity of the data carrier and at the same time serve as protection against unauthorized reproduction.
  • security elements for securing purposes, which permit a verification of the authenticity of the data carrier and at the same time serve as protection against unauthorized reproduction.
  • a film provided with an adhesive layer on one side is applied to a banknote in order to close a through opening previously introduced there.
  • the film is provided with a security feature such as a hologram or optically variable coating to form a film security element.
  • the present invention has for its object to provide a security element of the type mentioned above with a visually attractive appearance, which is simple and inexpensive to manufacture.
  • the invention is intended in particular to provide an advantageous production method for such security elements.
  • a film carrier is preferably provided in which at least one first color ink layer above the metallization and at least one second color ink layer below the metallization are arranged.
  • the metallization and the first and second chromatic color layers are then patterned simultaneously and precisely by the action of the laser radiation, so that in a first region an outline of the metallization and an outline of the laser-structured, at least one first color layer are precisely aligned, and in a contour of the metallization and an outline of the laser-structured, at least one second color-coordinated layer are precisely superimposed on a second area.
  • the first and second areas may or may not be coincidental.
  • the first and / or second region can also occupy the entire outline of the metallization.
  • the outline of the metallization or of the color-coordinated layers in each case generates a motif that appears in color when the security element is viewed.
  • the motifs When viewed from opposite sides, the motifs preferably appear with different color impression and possibly also with different patterns, as explained in more detail below.
  • a film carrier having an embossed structure is advantageously provided and provided with the said metallization.
  • a metallization for example, a metal coating of aluminum, silver, copper or alloys into consideration.
  • the embossed structure may in particular be a micromirror structure, a diffraction grating structure and / or a sub-wavelength structure.
  • the micromirrors may in particular be oriented such that the metallized embossed structure exhibits a so-called rolling-bar effect, as described for example in the document DE 10 2010 047 250 A1 , the disclosure of which is incorporated in the present application, is described in more detail.
  • At least one color ink layer in step B) is printed over the entire surface.
  • at least one colored layer is printed in pattern form, for example in the form of parallel strips, a dot or line pattern, a checkerboard pattern, or a raster arrangement of recurring printing elements.
  • the color ink layers are advantageously printed in each case in a printing area, the shape and size of which are selected so that it covers the desired area of the motif to be created by the laser application, taking into account all register tolerances.
  • the print areas in each direction can be selected to be about 0.2 mm, 0.3 mm, 0.4 mm or 0.5 mm larger than the motif to be created by the laser application in order to take account of corresponding register tolerances.
  • the color ink layers are preferably formed by applying laser-sensitive, in particular laserablatierbarer bright colors. Also, preferably varnish colored layers are applied.
  • a color ink layer applied to the metallization can be printed directly onto the metallization, but it is also possible to provide intermediate layers, for example protective lacquers or primer layers.
  • the color ink layer extends at least in some areas beyond the metallization, such that after the laser demetallization, the boundaries of the remaining metallization and the chromatic color overlap each other at least in certain areas.
  • At least one color-coordinated layer is advantageously structured by removing color constituents from the color-coordinated layer by the action of the laser radiation.
  • at least one color ink layer can be structured by converting color components of the color ink layer into transparent or differently colored modifications as a result of the action of the laser radiation.
  • the metal material of the metallization does not necessarily have to be removed by the laser radiation, metal can also be oxidized, for example by the action of the laser radiation and thus made transparent.
  • the metallization prior to step S) is pre-structured by another demetallization process (ie a demetallization process which is not a laser demetallization process), in particular by a washing or etching process.
  • a demetallization process which is not a laser demetallization process
  • the area covered by the metallization is ideally significantly reduced, so that only a relatively small area has to be removed along the outline of the motif to be generated during the subsequent laser demetallization.
  • the Laserdemetallmaschine done with lasers lower power or can be achieved at the same power a higher production speed.
  • the ablation thresholds for the metal of the metallization and at least one of the chromatic colors are clearly different, it can also be achieved with a suitably chosen laser beam shape, for example a broad Gaussian distribution, that a narrow edge arises along the laser-structured outline, in which either only the metal or only the chromatic color is removed. The width of this edge can be varied by the beam shape become.
  • the ablation threshold can be influenced by the choice of the metallization material, the choice of the chromatic color and also the laser wavelength used for laser demetallization.
  • At least one first laser-sensitive colored ink layer above the metallization and at least one second laser-sensitive colored ink layer are preferably arranged underneath the metallization, and in a first region, an outline of the laser-structured metallization and an outline of the laser-structured, at least one first color-coordinated layer are precisely superimposed, and in a second In the area, an outline of the laser-structured metallization and an outline of the laser-structured, at least one second color-coordinated layer lie precisely one above the other.
  • the metallization is advantageously present on an embossed structure, in particular a micromirror structure, a diffraction grating structure and / or a sub-wavelength structure.
  • the color ink layers are preferably formed by laser ablatable bright colors. For example, milori blue or laser ablatable gravure inks are possible. Furthermore, the color ink layers are preferably translucent.
  • the invention further includes a data carrier with a multilayer film security element of the type described.
  • the film security element is preferably arranged in or above a window region or a through opening of the data carrier.
  • a film security element with at least two color ink layers is used, wherein at least one first color ink layer above the metallization and at least one second color layer below the metallization are arranged.
  • the color ink layers may then advantageously produce a different color impression when viewing the window or opening from opposite sides.
  • FIG. 1 shows a schematic representation of a banknote 10 with a security element according to the invention in the form of a glued foil strip 12, which covers a through opening 14 in the banknote paper.
  • a colored and at the same time shiny metallic motif 16 is visible, which in the exemplary embodiment is shown 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 banknote 10 respectively metallic, but with different colors and even with different patterns.
  • FIG. 2 For this purpose, a closer inspection of the surroundings of the banknote window 14 is seen in the front bank 10V (FIG. Fig. 2 (a) ) or the banknote back 10R ( Fig. 2 (b) ).
  • Fig. 2 If you look at the banknote front 10V, the motif 16 appears shiny metallic and red in color. In addition, a bright horizontal bar 18 is visible in the interior of the motif 16, which when tilting the banknote along the longitudinal direction of the film strip 12 seems to wander up and down (arrows 20) and a so-called rolling-bar effect shows.
  • the maple leaf motif 16 When looking at the banknote back 10R ( Fig. 2 (b) ) is also the maple leaf motif 16 visible, however, it appears from the back of the bill not only mirrored, but also with different color and pattern impression.
  • the motif 16 appears metallically glossy when viewed on the banknote back 10R and essentially with a green stripe pattern in which green color areas 24 of non-colored, purely metallic appearing strips 22 are interrupted. Again, a rolling bar effect is visible in the interior of the subject 16, in which a bright horizontal bar 18 when tilting the banknote 10 through the green and metallic areas of the maple leaf motif seems to wander.
  • FIGS. 3 (b) and (c) the security element in the intermediate step the Fig. 3 (a) in supervision on the front or the back of the security element show.
  • a film carrier 30 having opposed major surfaces 30V and 30R is provided.
  • the film carrier 30 is provided on a first main surface 30V with an embossing lacquer layer 32 and embossed into the embossing lacquer layer 32 is a micromirror structure 34 which generates the desired rolling-bar effect in reflection.
  • the embossed structure 32, 34 is provided with a metallization 36, for example an aluminum metallization, which covers the entire embossed structure 32, 34 in the exemplary embodiment.
  • a red, glazed colored ink 38 is printed on the metallization 36 and indeed in a printing area whose shape and size are chosen so that it takes into account all tolerances tolerated in any case the desired area of the subject 16, the location in Fig. 3 (b) dashed to the illustration, covered.
  • a green, glazed colored ink 40 is printed in a stripe pattern and indeed in a printing area, the shape and size are selected so that it covers the desired area of the subject 16 in all cases, taking into account all tolerances tolerances ,
  • the location of the subject 16 is also in Fig. 3 (c) drawn with dashed lines.
  • the film carrier 30 with the metallization 36 and the two bright colors 38, 40 is applied in the region 44 outside the desired motif 16 with laser radiation 42, as in Fig. 3 (a) shown.
  • the laser radiation 42, the metallization 36 and the bright colors 38, 40 are structured simultaneously and accurately.
  • the outline of the laser-structured metallization 36, the outline of the laser-structured chromatic color 38 and the outer outline of the laser-structured chromatic color 40 fit one over the other and follow the outline of the motif 16, as in FIG Fig. 3 (d) in cross section and in Fig. 2 (a) and (b) each shown in supervision. Since only the region 44 outside of the subject 16 is exposed to laser radiation, the stripe structure of the green colored ink 40 in the interior of the motif 16 is retained on the rear side.
  • a security element 12 is formed with the at Fig. 2 explained accurate views that show not only different colors (red from the front, green from the back), but also different patterns (filled maple leaf from the front, maple leaf with striped pattern from the back).
  • the second colored ink 40 can also be applied to the second main surface 30R before the metallization of the embossed structure 32, 34 and possibly even before the embossed structure 34 is produced or even before the embossing lacquer layer 32 is applied.
  • only one colored ink 38 can be provided, for example, if the security element 12 is not arranged in a window 14 and therefore different colors for the front and back side view promise no advantage.
  • Fig. 3 The manufacturing method described leads to a laminate film in which the film carrier 30 is provided with color ink layers 38, 40 both on the front side 30V and on the back side 30R.
  • Such laminate films may, for example, as in Fig. 1 shown applied over a through opening 14 of a paper banknote, wherein the carrier film 30 present in the security element 12 provides the required stability of the window area against mechanical stress.
  • FIG Fig. 4 explains 4 (a) and (b) each show intermediate steps in the production of the transfer film 50 in cross section.
  • a carrier foil 52 is provided and printed on one of its major surfaces 52V in a striped pattern a green, stained, multicolor 40. This happens again in a pressure range whose shape and size are chosen so that it takes into account all tolerances tolerated in any case, the desired area of the subject 16 covers.
  • the printed carrier film 52 is provided with an embossing lacquer layer 32 and embossed into the embossing lacquer layer 32 is a micromirror structure 34 which generates the desired rolling-bar effect in reflection.
  • the embossed structure 32, 34 produced in this way is provided with a metallization 36, which also covers the entire embossed structure 32, 34 in this exemplary embodiment.
  • a red translucent color ink 38 is printed on the metallization 36 and indeed in a printing area whose shape and size are chosen so that it covers the desired area of the subject 16 in any case taking into account all tolerances tolerances.
  • the carrier foil 52 with the metallization 36 and the two bright colors 38, 40 is applied in the region 44 outside the desired motif 16 with laser radiation 42, as in Fig. 4 (a) illustrated.
  • the outline of the laser-structured metallization 36, the outline of the laser-structured colored ink 38 and the outer outline of the laser-structured colored ink 40, the metallization 36 and the bright colors 38, 40 are precisely and precisely structured by the action of the laser radiation 42 follow the outline of the motif 16, as in Fig. 4 (b) shown.
  • the carrier film 52 may be provided with a releasable layer, or it may be a release-capable colored ink 40 and a releasable Embossing used 32, of which the carrier film 52 can be easily separated later.
  • the second chromatic color 40 is embedded in the embossing lacquer layer 32.
  • the structuring of the colored ink 40 is therefore generally not carried out by removing color components, but by a laser-induced conversion of the colored ink 40 into a transparent or differently colored modification in a conversion region 54 (FIG. Fig. 4 (b) ).
  • some inks can only be removed if they lie on the surface of a layer sequence, so that for the production according to Fig. 4 a suitable, a conversion-permitting color tone 40 must be selected.
  • a carrier film is provided and provided on one of its main sides successively with an embossed structure, a metallization and a first color ink layer, as described above.
  • the carrier film with the metallization and the first color-coordinated layer is then exposed to laser radiation in a first region outside the desired motif, whereby the metallization and the first color-coordinated layer are simultaneously and precisely structured.
  • a second carrier foil with a release layer facing the first carrier foil is then laminated onto this layer sequence.
  • the first carrier film is removed, for example by separating coils, and printed on the now exposed back of the embossing pattern, the second color ink.
  • the resulting layer sequence present on the second carrier film is exposed to laser radiation in the region outside the desired motif, the laser radiation being influenced by the laser radiation the metallization and the second color-coordinated layer are simultaneously and precisely structured so that an outline of the laser-structured second color-coordinated layer and an outline of the metallization are precisely aligned one above the other. Since the entire layer structure is arranged on one side of the second carrier foil, it can be pulled off after transferring the layer sequence to a target substrate.
  • FIG. 5 shows a foil security element 60 according to a further embodiment of the invention, which in principle already in connection with Fig. 3 has described structure.
  • the security element 60 of the Fig. 5 already in supervision two-tone shiny metallic, with specifically chosen as motif 16 value "50" has a red shiny number "5" and a blue glossy digit "0". Both numbers show a common rolling bar effect with a light bar 18 moving up or down during tilting.
  • the two-tone design of the Fig. 5 can starting from the at Fig. 3 can be obtained by applying the first colored ink 38 to the metallization 36 of the Fig. 3 (a) in a first printing area, a red, glazed colored ink and in a second printing area, a blue, glazed colored ink is printed.
  • the shape and size of the first printing area are chosen so that it covers the area of the number "5" taking into account all tolerances.
  • the shape and size of the second printing area are chosen so that it covers the area of the digit "0" taking into account all tolerances.
  • the further procedure then proceeds as in Fig. 3 described.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • General Health & Medical Sciences (AREA)
  • Optics & Photonics (AREA)
  • Toxicology (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Credit Cards Or The Like (AREA)
EP18000985.4A 2017-12-21 2018-12-19 Élément de sécurité en feuille et procédé de fabrication Active EP3501841B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017011916.3A DE102017011916A1 (de) 2017-12-21 2017-12-21 Foliensicherheitselement und Herstellungsverfahren

Publications (2)

Publication Number Publication Date
EP3501841A1 true EP3501841A1 (fr) 2019-06-26
EP3501841B1 EP3501841B1 (fr) 2020-10-07

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EP18000985.4A Active EP3501841B1 (fr) 2017-12-21 2018-12-19 Élément de sécurité en feuille et procédé de fabrication

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EP (1) EP3501841B1 (fr)
DE (1) DE102017011916A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008008685A1 (de) * 2008-02-12 2009-08-13 Giesecke & Devrient Gmbh Sicherheitselement und Verfahren zu seiner Herstellung
DE102011117677A1 (de) * 2011-11-04 2013-05-08 Giesecke & Devrient Gmbh Optisch variables Sicherheitselement

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008013073B4 (de) * 2008-03-06 2011-02-03 Leonhard Kurz Stiftung & Co. Kg Verfahren zur Herstellung eines Folienelements und Folienelement
DE102008028705B4 (de) * 2008-06-17 2022-02-24 Bundesdruckerei Gmbh Verfahren zum Herstellen eines Wert- und/oder Sicherheitsdokuments sowie Wert- und/oder Sicherheitsdokument mit einer demetallisierten Struktur
DE102010047250A1 (de) 2009-12-04 2011-06-09 Giesecke & Devrient Gmbh Sicherheitselement, Wertdokument mit einem solchen Sicherheitselement sowie Herstellungsverfahren eines Sicherheitselementes

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008008685A1 (de) * 2008-02-12 2009-08-13 Giesecke & Devrient Gmbh Sicherheitselement und Verfahren zu seiner Herstellung
DE102011117677A1 (de) * 2011-11-04 2013-05-08 Giesecke & Devrient Gmbh Optisch variables Sicherheitselement

Also Published As

Publication number Publication date
DE102017011916A1 (de) 2019-06-27
EP3501841B1 (fr) 2020-10-07

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