EP2874823A1 - Procédé de fabrication d'un élément de sécurité multicouches - Google Patents

Procédé de fabrication d'un élément de sécurité multicouches

Info

Publication number
EP2874823A1
EP2874823A1 EP13737151.4A EP13737151A EP2874823A1 EP 2874823 A1 EP2874823 A1 EP 2874823A1 EP 13737151 A EP13737151 A EP 13737151A EP 2874823 A1 EP2874823 A1 EP 2874823A1
Authority
EP
European Patent Office
Prior art keywords
embossed
security element
diffraction structure
metallized
photoresist
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
EP13737151.4A
Other languages
German (de)
English (en)
Other versions
EP2874823B1 (fr
Inventor
Winfried HOFFMÜLLER
Theodor Burchard
Michael Rahm
Andreas Rauch
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 GmbH
Original Assignee
Giesecke and Devrient GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
Publication of EP2874823A1 publication Critical patent/EP2874823A1/fr
Application granted granted Critical
Publication of EP2874823B1 publication Critical patent/EP2874823B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B42D25/425—Marking by deformation, e.g. embossing
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • 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
    • 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
    • B41M3/148—Transitory images, i.e. images only visible from certain viewing angles
    • B42D2033/04—
    • B42D2033/06—
    • B42D2033/10—
    • B42D2033/24—
    • B42D2035/36—
    • 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
    • B42D25/324—Reliefs
    • 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
    • B42D25/328—Diffraction gratings; Holograms

Definitions

  • the invention relates to a method for producing a multilayer security element for viewing in reflected light and transmitted light.
  • the invention also relates to a multilayer security element produced by such a method, a transfer material, a security paper and a valuable article with such a security element, and a method for producing such a security paper or valuables.
  • Valuables in particular value documents, such as banknotes, shares, identity cards, credit cards, certificates, checks, and other forgery-prone papers, such as identification documents of various kinds, as well as branded articles and packaging of branded goods, are often provided with security elements for security purposes, which verify their authenticity while protecting against unauthorized reproduction.
  • the security elements may, for example, take the form of security threads or stickers or any other form which can be introduced or applied to a valuables or a security paper, wherein a "valuable article” in the meaning of the present invention is any article to be protected against counterfeiting, in particular a value document, while "Security paper" represents the precursor to a value document that is not yet executable.
  • Security features such as see-through windows in banknotes have become increasingly attractive as security features in recent years.
  • security elements that show the viewer both in supervision and in review a predetermined view. Based on this, the present invention seeks to provide an advantageous method for producing a security element of the type mentioned.
  • the invention provides a method for producing a multilayer security element for viewing in reflected light and transmitted light, which security element shows a transmitted light view when viewed in transmitted light and a first or second incident light view from opposite sides in reflected light.
  • the method comprises the following method steps in the order indicated:
  • AI producing an embossed and metallised first diffraction structure on the upper side of the carrier foil which produces the first incident light view in the finished security element
  • L applying a selectively removable lacquer layer to the embossed and metallised first diffraction structure
  • A2 producing an embossed and metallized second diffraction structure on the selectively removable lacquer layer, which produces the second incident light view in the finished security element
  • R applying a resist layer to the embossed and metallized second diffraction structure in the form of a transmitted light pattern with resist areas and recesses between the resist areas
  • E2 removing the metallization of the second diffraction structure in the recesses between the resist areas
  • the method according to the invention does not require separate production of the first and second diffraction structures on different carrier films together with the subsequent transfer step. Rather, the first and second diffraction structures can be constructed congruently on the same side of a single carrier film in a simple manner.
  • the carrier film is adhesively bonded to an embossing lacquer layer, and the embossing lacquer layer is embossed and metallized in order to produce the first diffraction structure on the upper side of the carrier film.
  • the embossing lacquer layer is first embossed and then metallized over the entire surface, thus also that the embossing lacquer layer is first metallized over its entire area and then embossed.
  • an embossable carrier film is provided in step B), and in step AI) the carrier film itself is embossed and metallized in order to produce the first diffraction structure on the upper side of the carrier film. In this case, it can be provided both that the carrier film is first embossed and then metallized over the entire surface, and also that the carrier film is first metallized over the entire surface and then embossed.
  • a selectively soluble lacquer layer is a solvent-soluble one
  • the paint soluble in a solvent is physically dried after application.
  • the soluble paint is then removed by means of the solvent in the recesses between the resist areas.
  • the metallization of the first diffraction structure in the recesses between the resist areas can also be removed.
  • the soluble paint in separate steps, can first be removed with the aid of the solvent and, after removal of the soluble paint, the metallization of the first diffractive structure can be removed. The removal of the metallization of the first diffraction structure is preferably carried out by etching.
  • a photoresist is applied in step L) as a selectively removable lacquer layer.
  • the photoresist is advantageously dried physically, in which the solvents present in the paint are at least partially, ideally substantially completely removed. the.
  • the drying of the photoresist can be carried out by means known per se for drying, for example by means of hot air.
  • step E1 the photoresist is then exposed from the side of the resist areas and the recesses between the resist areas, and the photoresist is removed in the exposed areas. Between the exposure and the removal of the photoresist, an annealing step for stabilizing the unexposed photoresist can be performed.
  • tempering homogenizes and thereby stabilizes the exposed areas. Furthermore, in the case where the exposure takes place with a (monochromatic) laser, certain unwanted structures in the photoresist (standing waves) can be eliminated again. It should also be noted that even after developing, i. After removal of the previously exposed photoresist, an annealing step may be performed which serves to stabilize the photoresist remaining after development as part of the layer build-up.
  • the metallization of the first diffraction structure can be removed in step El) together with the photoresist. Alternatively, in step El), the photoresist may be first removed in separate steps and the metallization of the first diffraction structure removed after removal of the photoresist.
  • a resist is advantageously printed in the form of a pattern that corresponds to the transmitted light view.
  • a photoresist is also advantageously applied in step R), the photoresist is in the form of the transmitted light view corresponding pattern or its Complements exposed and the photoresist is removed in the exposed areas.
  • the selectively removable lacquer layer can first be embossed in step A2) and then metallized over the entire surface.
  • the selectively removable lacquer layer can first be metallized over the entire surface and then embossed afterwards.
  • One of the sides of the carrier film preferably the underside, is advantageously provided with a dye-receiving layer, wherein the ink-accepting layer can in particular be printed on, laminated on or coated on.
  • the security element is further advantageously provided on the top and / or bottom of the carrier film with a protective lacquer layer.
  • the security element is provided on one of the sides of the carrier film with an adhesive structure for bonding the security element.
  • the adhesive structure is advantageously cut out in the recesses between the resist areas in order not to impair the visual appearance in these areas.
  • the adhesive structure may in particular comprise a primer and a heat sealing lacquer.
  • the security element is provided with at least one further functional layer, in particular with a polarization feature or a magnetic feature.
  • the invention also includes a multilayer security element for viewing in incident and transmitted light which, when viewed in transmitted light, has a transmitted light view and from opposite sides in reflected light shows a first or second incident light view.
  • the multilayer security element can be produced in the above-mentioned manner and comprises: a transparent or translucent carrier foil having a top side and an opposite bottom side, an embossed and metallized first diffraction structure arranged on the top side of the carrier foil which produces the first incident light view and which is in the form of one of the Transmitted light image corresponding pattern is formed, a present in the form of the transmitted light pattern on the embossed and metallized first diffraction layer paint layer, and in the form of the transmitted light pattern corresponding pattern on the paint layer present embossed and metallized second diffraction structure, which generates the second incident light view.
  • the security element further comprises a resist layer, which is present in the form of a pattern, which corresponds to the transmitted light view, on the embossed and metallized second diffraction structure.
  • the first and second diffraction structures may be formed by any embossed structures.
  • these are holographic structures, but also matt structures, sawtooth structures or diffractive optical micromirror arrangements are possible.
  • the embossing lacquer layer may consist of a UV-crosslinking embossing lacquer with prepolymers, actiwerCOLnern and photoinitiators, or be formed from a thermoplastically embossable embossing lacquer, for example based on polymethylmethacrylates.
  • Typical resist coatings are nitrocellulose-based paints, vinyl chloride copolymers and polyvinyl butyrals.
  • the invention further includes a transfer material for transferring security elements to a security paper or a valuables such as a value document, the transfer material having a plurality of security elements of the type described.
  • the invention further includes a security paper or a valuable article, such as a value document, wherein the security paper or the valuable article has a security element of the type described.
  • the invention includes a method for producing a security paper or a valuable article, such as a value document, in which a security element of the type described is applied thereto or at least partially introduced therein.
  • the security paper or the valuable article has a passage opening which is covered on one side by the security element according to the invention.
  • the opposite side may optionally be covered with a foil element which contains a perforation area which is congruent to the passage opening.
  • the opposite side of the security paper or article of value is provided with a coating which compensates for the change in physical properties of the security paper or valuables by the one-sided application of the security element.
  • the coating can be in particular a self-supporting layer, such as a film, or even a non-self-supporting layer, such as an applied lacquer layer.
  • the film or coating arranged on the opposite side of the security element can have security features, such as, for example, luminescent substances or single- or multi-layered pigments. If the film element arranged on the opposite side of the security element according to the invention is a stretched film, this has polarization properties which can be evaluated manually or else by machine, for example using a polarization filter.
  • the security element according to the invention can, of course, in addition to the particularly preferred arrangement in the region of a passage opening, also be arranged wholly or partly in a security paper / document of value. If a translucent substrate is used for the security paper, and if the security element is essentially completely embedded in the substrate, generally only the transmitted-light view can be well perceived by the viewer.
  • the view of the "exposed side" of the security element can be perceived in addition to the transmitted light view, and it is also known to form security elements in the form of a so-called "pendulum" alternately on one side and the other side of the substrate.
  • Such a security element then has a first incident light view, which is only partially perceptible from one side of the substrate, and a second incident light view, which is only partially visible from the opposite second side of the substrate.
  • the security element in the case of an at least translucent embodiment of the substrate can also be perceived in transmitted light by the viewer (transmitted light view).
  • the transmitted light view of the entire partially embedded security element can be perceived by the viewer while the observer only partially (in the exposed areas) and only from one side of the security paper / value document substrate can perceive.
  • the viewer of the security element according to the invention can in the areas in which the security element is not arranged in the region of a passage opening of the security paper / value document, usually a transmitted light view (translucent substrate) and of a certain (exposed) area of the security element only a first or second incident light perception. Only in the area of the passage opening, in addition to the transmitted light view, in a certain area of the security element, the viewer can perceive both the first and the second incident light view (from opposite sides).
  • a “transparent” material is understood as meaning a material which substantially completely passes incident electromagnetic radiation at least in the visible wavelength range from about 380 nm to about 780 nm
  • a “transparent” material is the transmittance T> 0.8, where T is defined as the quotient of the radiant power L transmitted through the material and the radiant power Lo radiated onto the substrate.
  • T L / Lo
  • an "opaque” or “opaque” material has a transmittance T ⁇ 0.1, where T is defined as the quotient L / Lo (see above).
  • an opaque material does not substantially transmit incident electromagnetic radiation, at least in the visible wavelength range from about 380 nm to about 780 nm.
  • a “translucent”, “translucent” or “semitransparent” material has a transmittance T greater than 0.1 and less than 0.8, at least in the visible wavelength range from about 380 nm to about 780 nm, ie 0.1 ⁇ T ⁇ 0.8.
  • the subjective perception of a transparent, translucent or opaque material by a viewer may in some cases deviate significantly from the exact definition given above for transparent, translucent or opaque material.
  • the subjective perception of a transparent, translucent or opaque material is very strong depends on the lighting situation, that is, whether the material is viewed by the viewer in reflection, transmission or in a combination of reflection and transmission.
  • a viewer under certain circumstances perceives a security element as transparent, even if the transmittance of the security element more than z.
  • the light scattering of the observed material has a similarly large influence on the subjective perception of a viewer because, among other things, the scattering influences the contrast between light and dark areas of the viewed material.
  • paper in particular cotton paper
  • paper which contains a proportion of polymeric material in the range of 0 ⁇ x ⁇ 100% by weight.
  • the substrate is a plastic, in particular a plastic film, for.
  • a film of polyethylene (PE), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), polypropylene (PP) or polyamide (PA) is.
  • the film may also be monoaxially or biaxially stretched. The stretching of the film, inter alia, leads to it receiving polarizing properties that can be used as another security feature.
  • the substrate may also be formed as a multilayer composite, in particular a composite of several different films (composite composite) or as a paper-film composite.
  • the films of the composite can be z. B. be formed from the aforementioned plastic materials.
  • Such a composite is characterized by an extraordinarily large which is a great advantage for the durability of the security element.
  • these composite materials can be used in certain climatic regions of the earth with great advantage.
  • the paper-film composite has an inner base paper and two outer film layers, as described in more detail in the document EP 1 545 902 B1, the disclosure of which is incorporated into the present description. Also advantageous is the inverse structure of a paper-film composite, in which an inner film is provided with two outer layers of paper.
  • All materials used as a substrate may have additives which serve as further authenticity features.
  • luminescent substances are to be considered, which are preferably transparent in the visible wavelength range and in the non-visible wavelength range by a suitable tool, for.
  • a UV or IR radiation emitting radiation source can be excited to produce a visible or at least detectable luminescence.
  • the materials used for the security element in particular paints or inks, may also have the aforementioned additives.
  • FIG. 1 shows a schematic representation of a security element according to the invention, which shows a viewer in reflected light and transmitted light three different appearances
  • FIG. 2 shows a security paper or document of value with a passage opening which is covered by a security element according to the invention; the opposite side is optionally covered with a film with a congruent opening area,
  • FIG. 3 shows a security paper or document of value as in FIG. 2, in which the opposite side is provided with a compensating coating
  • FIG. 4 in (a) to (g) the process sequence in the production of a security element according to the invention, FIG.
  • FIG. 5 shows in (a) to (c) a modification of the method sequence of FIG.
  • FIG. 8 shows a schematic representation of a security element 10 according to the invention, which shows a viewer 24 in reflected light and transmitted light three different appearances ALI, AL2, and DL.
  • a reflection in the reflected light refers to a consideration of the security element 10, in which the viewer 24-AI or 24-A2 is on the same side as the light source 20- AI or 20- A2, so that the incident light 22 from the security element 10 for Eye of the observer is reflected.
  • Transmitted light viewing refers to a consideration in which the observer 24-D and the light source 20-D are on opposite sides of the security element so that the incident light 26, after transmission through the security element 10, reaches the observer's eye.
  • the security element 10 when viewing its upper side 12 in incident light, displays a first incident light view ALI, which in the exemplary embodiment is formed by a first holographic motif.
  • ALI first incident light view
  • the security element in reflected light shows a second incident light view AL2
  • a second holographic motif which differs from the first holographic motif.
  • the first holo- graphic motif can represent a portrait and the second holographic motif an architectural motif.
  • a third appearance of the security element results when viewed through the light. Does the viewer 24-D the security element 10 against a light source 20-D, the security element 10 generates a transmitted light view DL, which differs from the first and second incident light views.
  • the security element in transmitted light shows a geometric motif, such as a triangle formed from parallel lines. It is self-evident that the transmitted-light view recognizable in transmitted light can be configured essentially as desired, for example next to the previously mentioned geometric motif as a portrait or graphic symbol, where the motif, portrait or graphical symbol can be formed from a multiplicity of lines.
  • the lines can be arranged parallel or substantially parallel over the entire area of the viewing motif, wherein the lines can also be lines which are modulated on one or both sides, ie lines whose width extends to one side or to both sides with respect to the line Line emphasis changed.
  • simple transmitted light motifs for example in the form of a pattern of a plurality of polygons, in a regular arrangement, for example an arrangement of triangles, squares or hexagons (honeycomb pattern), can be used, wherein the above-mentioned line arrangements can also be used.
  • surface patterns are also considered, which are periodic or aperiodic patterns / motifs.
  • aperiodic tile patterns which represent a so-called “Penrose tiling”
  • Penrose tiling aperiodic tile patterns
  • the security element 10 is used, for example, to cover a passage opening 32 of a safety device. paper or valuables.
  • the opposite side of the security paper or valuables 30 may optionally be covered with a film element 34 which has a perforation region 36 which is congruent to the passage opening 32.
  • the security element 10 opposite side of the security paper or the valuables item 30 is provided in another embodiment of the invention with a coating 38 which is disposed substantially in the region of the security element.
  • the coating 38 is applied in such a way that no or substantially no coating material is present within the opening.
  • the coating 38 compensates for the change in the physical properties of the security paper or valuables 30, which was caused by the one-sided application of the security element 10, in particular the change in the expansibility of moisture and / or temperature changes.
  • the coating 38 generates a counterforce to the change by the security element 10, which leads to an improved flatness of the security paper or document of value 30, even with fluctuating moisture and / or temperature values.
  • the coating 38 may be formed by a self-supporting layer, such as a foil, or by a non-self-supporting layer, such as an applied lacquer layer.
  • FIG. 4 illustrates in (a) to (g) the process sequence in the production of a security element 10 according to the invention.
  • a transparent or translucent carrier film 40 is provided as a starting point.
  • the carrier film has an upper side 42 and an opposite lower side 44.
  • the terms top and bottom serve merely to simplify the description of the layer structure in the drawings and ben no restrictive meaning.
  • the security element 10 may be pre-applied to a target substrate, such as a security paper or document of value, both top and bottom.
  • a partial or complete introduction of the security element in a security paper or document of value can be done in any orientation of the security element.
  • the upper side 42 of the carrier film 40 is adhesively bonded to a transparent or translucent embossing lacquer layer 46.
  • embossing lacquer layer 46 a relief structure 48 in the form of a first diffraction structure is embossed, so that the structure shown in Fig. 4 (a) is formed.
  • the first diffraction structure can, for example, represent a holographic portrait and generates the first incident light view ALI after the metallization step in the finished security element (FIG. 1).
  • embossed embossing lacquer layer 46, 48 is then provided with a first metallization 50, for example a gold-colored metallization.
  • the first metallization 50 is then coated with a layer 52 of a soluble lacquer which is soluble in a desired solvent, for example a caustic.
  • a relief structure 54 is impressed in the form of a second diffraction structure, so that the structure shown in Fig. 4 (c) is formed.
  • the second diffraction structure can, for example, represent a holographic architectural motif and generates the second incident light view AL2 after the metallization step in the finished security element (FIG. 1).
  • the embossed lacquer layer 52, 54 is covered over its entire surface with a second metallization 56, for example a silver-plated metal layer 56.
  • a second metallization 56 for example a silver-plated metal layer 56.
  • the second metallization 56 is printed with a resist layer 58 in the form of a pattern 60, which corresponds to the desired transmitted light view.
  • the pattern 60 consists of resist areas 62 and recesses 64 between the resist areas.
  • the resist areas 62 and the recesses 64 may each be narrow parallel lines that together form a resist layer 58 having a triangular outline.
  • the recesses 64 generate the transmitted-light view DL.
  • the second metallization 56 is removed by etching, for example by a caustic, into the non-resist-coated areas 64 as shown in FIG. 4 (e). In the resist areas 62, the second metallization 56 is protected by the resist 58 and is retained.
  • the soluble paint 52 is removed in the areas 64 not covered with the resist 58 and the metallization 56, as shown in Fig. 4 (f). In the resist areas 62, the soluble paint 52 is protected by the resist 58 and the metallization 56 and is retained.
  • the first metallization 50 is removed by etching, for example by a caustic, into the areas 64 not covered with resist 58, metallization 56 and resist 52, as shown in FIG. 4 (g). In the resist areas 62, the first metallization 50 is protected by the resist 58, the metallization 56 and the lacquer 52 and is retained.
  • the first metallization 50 in the areas 64 not covered by the resist 58, the metallization 56 and the varnish 52 may also be replaced by other techniques, such as exposure to laser radiation. radiation, can be removed.
  • the removal of the first metallization 50 by exposure to laser radiation has the advantage over etching that the etching step is eliminated and, if appropriate, further features enhancing the forgery-proofing of the finished security element can be introduced.
  • additional information is introduced, or by means of the laser radiation in the areas 64 on the substrate 80 simultaneously with the removal of the layer 50 additional information is introduced, for example, by partial Bleaching (color change) of the material 80.
  • the resulting multilayer structure When viewed in reflected light or transmitted light, the resulting multilayer structure shows the views ALI, AL2 and DL explained in connection with FIG. 1.
  • the first metallization 50 can not only be removed in a separate method step but can also be removed in the same method step as the soluble coating 52.
  • a soluble paint 52 may be used which is soluble in a caustic suitable for demetallization. The same liquor may then remove both the soluble paint 52 and the metallization 50 in the recessed areas 64.
  • a separate demetallization step for the first metallization 50 is usually required. In all process steps, if necessary, an excess of alkali is washed off with a suitable medium.
  • the resist layer 58 may be removed in a further process step after the etching of the second metallization 56 or may be finished Security element remain, for example, to colorize the second incident light view of the second diffraction structure.
  • FIG. 5 A modification of the process flow of Fig. 4 is illustrated in Fig. 5.
  • a transparent or translucent carrier film 40 is initially provided as in the method of FIG. 4, the top side 42 of the carrier film 40 is adhesively bonded to a transparent or translucent embossing lacquer layer 46, into the embossing lacquer layer 46 Embossed relief structure 48 in the form of the first diffraction structure, the embossed embossing lacquer layer 46, 48 over the entire surface provided with a first metallization 50, and the first metallization 50 coated with a layer 52 of a soluble paint.
  • the soluble resist layer 52 is then provided over its entire surface with a second metallization 56, for example a silver-colored metallization. Only after this metallization step is a relief structure 54 in the form of the second diffraction structure impressed into the metallized lacquer layer 52, 56. Then, as shown in Fig. 5 (c), the embossed second metallization 56 is printed with a resist layer 58 in the form of a pattern 60 with resist areas 62 and recesses 64, which corresponds to the desired transmitted light view DL. The further process then proceeds as shown in FIG. 4 (d).
  • FIG. 6 A further variant of a method sequence according to the invention is illustrated in FIG. 6.
  • a transparent or translucent carrier film 40 is provided, the top side 42 of the carrier film 40 adhesively bonded to a transparent or translucent embossing lacquer layer 46, embossed into the embossing lacquer layer 46 is a relief structure 48 in the form of the first diffraction structure, and the embossed Embossing lacquer layer 46, 48 over the entire surface with a first metallization 50 provided.
  • the first metallization 50 is then coated with a layer 70 of positive photoresist which becomes soluble in a developer solution upon exposure.
  • a relief structure 54 in the form of the second diffraction structure is then embossed into the photoresist layer 70, the embossed photoresist layer 70, 54 is provided with a second metallization 56 over the entire area, and the second metallization 56 finally becomes a resist layer 58 in the form of a pattern 60 having resist areas 62 and recesses 64 printed, which corresponds to the desired transmitted light view DL.
  • the layer sequence resulting from these process steps is shown in FIG. 6 (a).
  • the second metallization 56 is first removed by etching, for example by an alkali in the not covered with resist 58 areas 64. In the resist areas 62, the second metallization 56 is protected by the resist 58 and is retained.
  • the photoresist 70 is then exposed through the demetallization design resulting from the etching step with the resist areas 62 and the second metallization 56 (reference numeral 72).
  • the photoresist 70 is protected by the resist 58 and the metallization 56 and remains unexposed.
  • the exposed parts of the photoresist 70 in the present case just the subregions located in the recesses 64, are dissolved and washed away by a developer solution, so that those shown in FIG 6 (c) shows the layer sequence shown.
  • a tempering step can be carried out in a conventional manner, a tempering step.
  • the first metallization 50 is then removed by etching, for example by an alkaline solution, into the areas 64 not covered with resist coating 58, the metallization 56 and the lacquer 70, so that the areas shown in FIG 4 (g).
  • etching for example by an alkaline solution
  • a separate step of removing the metallization 50 may then be omitted.
  • a transparent or translucent carrier film 40 is provided, the top side 42 of the carrier film 40 adhesively bonded to a transparent or translucent embossing lacquer layer 46, a relief structure into the embossing lacquer layer 46 48 imprinted in the form of the first diffraction structure, the embossed embossing lacquer layer 46, 48 is provided over its entire area with a first metallization 50, and the first metallization 50 is completely coated with a layer 52 of a photoresist 70.
  • the photoresist layer 70 is initially provided with a second metallization 56 over the entire area. Only after the metallization step is a relief structure 54 in the form of the second diffraction structure impressed into the metallized lacquer layer 70, 56. Then, the embossed second metallization 56 is printed with a resist layer 58 in the form of a pattern 60 with resist areas 62 and recesses 64, which corresponds to the desired transmitted light view DL.
  • the further method is as shown in FIG. 6 (a).
  • FIG. 7 illustrates in (a) to (d) the process sequence of a further production process according to the invention.
  • an embossable transparent or translucent carrier sheet 80 having an upper side 82 and an opposite lower side 84 is first provided.
  • a relief structure 88 in the form of the first diffraction structure is impressed in the upper side 82 of the carrier film 80, so that the structure shown in FIG. 7 (a) is formed.
  • the first diffraction structure can represent, for example, a holographic portrait and generates the first incident light view ALI after a metallization step in the finished security element.
  • the embossed top surface of the carrier sheet 80 is then provided with a first metallization 50 over its entire surface.
  • the first metallization 50 is then coated with a layer 70 of a positive-working photoresist, which becomes soluble in a developer solution by exposure.
  • the photoresist layer 70 is then provided over its entire surface with a second metallization 56.
  • a relief structure 54 in the form of the second diffraction structure is embossed into the metallized lacquer layer 70, 56.
  • the second diffraction structure can, for example, represent a holographic architecture motif and generates the second incident light view AL2 after a metallization step in the finished security element.
  • the embossed second metallization 56 is printed with a resist layer 58 in the form of a pattern 60 having resist areas 62 and recesses 64, which corresponds to the desired transmitted view DL.
  • the further process proceeds as shown in FIG.
  • a transparent or translucent carrier film 40 is provided and the upper side 42 of the carrier film 40 is adhesively bonded to a transparent or translucent embossing lacquer layer 46.
  • the embossing lacquer layer 46 is first provided over its entire surface with a first metallization 50, as shown in FIG. 8 (a). Only after the metallization step is a relief structure 48 in the form of the first diffraction structure impressed into the metallized embossing lacquer layer 46, 50.
  • the embossed first metallization 50 is then coated with a layer of a photoresist 70 which becomes soluble by exposure in a developing solution as shown in Fig. 8 (b).
  • the further method is as already described in FIG. 6.
  • an etch resist was applied as resist 58 in each case to produce the transmitted-light view DL.
  • a photoresist may also be applied over the entire area and the photoresist, depending on whether one is positive or negative working resist is exposed in the form of a transmitted light corresponding pattern or its complement.
  • the exposed areas (positive resist) or unexposed areas (negative resist) are subsequently removed by a developer solution.
  • an annealing step to stabilize the resist layer may be necessary or helpful.
  • a paint receiving layer can be provided on one of the two sides of the carrier film, preferably on the underside 44 or 84 not provided with the layer structure.
  • the ink-accepting layer can be printed, laminated or coated on it.
  • further features can be introduced in the laminating adhesive used and / or in one or more layers of the ink-accepting layer structure.
  • full-surface or motif-shaped luminescent layers, in particular fluorescent layers, or polarization features come into consideration.
  • the security element in all variants of the method as a rule is still provided with a structure for bonding the security element.
  • This usually consists of a primer and a heat sealing lacquer.
  • the heat-sealing lacquer and other layers which may interfere with the visual effect in transmittance are preferably recessed in the visually-visible region.
  • the security element can also be advantageously provided with one or more protective lacquer layers.
  • the security element can be equipped with magnetic properties.
  • magnetic elements between the first and second metallization can be hidden.
  • magnetic material becomes local to the first metallization imprinted, wherein the previous application of a primer on the first metallization may be required.
  • a further primer on the magnetic material may be necessary to ensure good adhesion of the photoresist or the soluble paint.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Credit Cards Or The Like (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un élément de sécurité multicouches, un élément de sécurité pouvant être obtenu par le procédé selon l'invention, un matériau de transfert, un papier de sécurité et un objet fiduciaire comportant un tel élément de sécurité, ainsi qu'un procédé de fabrication d'un tel papier de sécurité ou objet fiduciaire. Un élément de sécurité multicouches (10) selon l'invention, destiné à être observé en lumière incidente et en lumière transmise, présente lorsqu'on l'observe en lumière transmise un aspect en lumière transmise (DL) et, lorsqu'on l'observe en lumière incidente depuis des côtés opposés, un premier (AL1) ou un deuxième aspect en lumière incidente (AL2). L'élément de sécurité comprend une feuille support (40) transparente ou translucide possédant une face supérieure (42) et une face inférieure (44) opposée, une première structure diffractive (46, 48, 50) estampée et métallisée, disposée sur la face supérieure (42) de la feuille support (40), qui génère le premier aspect en lumière incidente (AL1) et qui est réalisée sous la forme d'un motif (60) correspondant à l'aspect en lumière transmise (DL), une couche de laque (52) présente sous la forme du motif (60) correspondant à l'aspect en lumière transmise sur la première structure diffractive estampée et métallisée, et une deuxième structure diffractive (54, 56) estampée et métallisée, présente sous la forme du motif (60) correspondant à l'aspect en lumière transmise sur la couche de laque (52), qui génère le deuxième aspect en lumière incidente (AL2).
EP13737151.4A 2012-07-19 2013-07-16 Procédé de fabrication d'un élément de sécurité multicouches Active EP2874823B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012014294.3A DE102012014294A1 (de) 2012-07-19 2012-07-19 Verfahren zur Herstellung eines mehrschichtigen Sicherheitselements
PCT/EP2013/002107 WO2014012657A1 (fr) 2012-07-19 2013-07-16 Procédé de fabrication d'un élément de sécurité multicouches

Publications (2)

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EP2874823A1 true EP2874823A1 (fr) 2015-05-27
EP2874823B1 EP2874823B1 (fr) 2016-09-14

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EP (1) EP2874823B1 (fr)
DE (1) DE102012014294A1 (fr)
WO (1) WO2014012657A1 (fr)

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DE102017011917A1 (de) 2017-12-21 2019-06-27 Giesecke+Devrient Currency Technology Gmbh Verfahren zum Herstellen eines mehrschichtigen Foliensicherheitselements

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DE102014118366A1 (de) 2014-12-10 2016-06-16 Ovd Kinegram Ag Mehrschichtkörper und Verfahren zu dessen Herstellung
DE102015106800B4 (de) * 2015-04-30 2021-12-30 Leonhard Kurz Stiftung & Co. Kg Verfahren zum Herstellen eines Mehrschichtkörpers
GB2539389B (en) * 2015-06-10 2017-12-06 De La Rue Int Ltd Image arrays for security devices and methods of manufacture thereof
DE102015009164A1 (de) † 2015-07-14 2017-01-19 Giesecke & Devrient Gmbh Datenträger mit Durchbrechungsbereich
DE102020004959A1 (de) * 2020-08-13 2022-02-17 Giesecke+Devrient Currency Technology Gmbh Optisch variables Sicherheitselement
DE102021002416A1 (de) 2021-05-06 2022-11-10 Giesecke+Devrient Currency Technology Gmbh Verfahren zum Herstellen eines Sicherheitselements und Sicherheitselement

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DE10243653A1 (de) 2002-09-19 2004-04-01 Giesecke & Devrient Gmbh Sicherheitspapier
EP1744904B2 (fr) * 2004-04-30 2019-11-06 Giesecke+Devrient Currency Technology GmbH Materiau en feuille et son procede de fabrication
DE102007039996B4 (de) * 2007-02-07 2020-09-24 Leonhard Kurz Stiftung & Co. Kg Sicherheitselement für ein Sicherheitsdokument und Verfahren zu seiner Herstellung
DE102009052792A1 (de) * 2009-11-11 2011-05-12 Giesecke & Devrient Gmbh Verfahren zur Herstellung eines Sicherheitselements mit gepasserten Metallisierungen und daraus erhältliches Sicherheitselement

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DE102017011917A1 (de) 2017-12-21 2019-06-27 Giesecke+Devrient Currency Technology Gmbh Verfahren zum Herstellen eines mehrschichtigen Foliensicherheitselements

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DE102012014294A1 (de) 2014-01-23
EP2874823B1 (fr) 2016-09-14

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