WO2022033653A1 - Élément de sécurité allongé et procédé de production d'un élément de sécurité allongé - Google Patents

Élément de sécurité allongé et procédé de production d'un élément de sécurité allongé Download PDF

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Publication number
WO2022033653A1
WO2022033653A1 PCT/EP2020/025374 EP2020025374W WO2022033653A1 WO 2022033653 A1 WO2022033653 A1 WO 2022033653A1 EP 2020025374 W EP2020025374 W EP 2020025374W WO 2022033653 A1 WO2022033653 A1 WO 2022033653A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
security element
carrier film
film
security
Prior art date
Application number
PCT/EP2020/025374
Other languages
German (de)
English (en)
Inventor
Matthias Pfeiffer
Stefan Bichlmeier
Andreas Holzmeister
Erwin Bacher
Original Assignee
Giesecke+Devrient Currency Technology 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+Devrient Currency Technology Gmbh filed Critical Giesecke+Devrient Currency Technology Gmbh
Priority to PCT/EP2020/025374 priority Critical patent/WO2022033653A1/fr
Publication of WO2022033653A1 publication Critical patent/WO2022033653A1/fr

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
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/355—Security threads
    • 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
    • B42D25/369—Magnetised or magnetisable materials

Definitions

  • the invention relates to an elongate, optically variable security element for protecting valuables, which has a color-shifting thin-film element and a machine-readable magnetic feature.
  • the invention also relates to a method for producing such a security element and to a data carrier equipped with such a security element.
  • Data carriers such as value or ID documents, but also other valuables, such as branded items, are often provided with security elements for protection, which allow the authenticity of the data carrier to be checked and which also serve as protection against unauthorized reproduction.
  • the security elements can be designed, for example, in the form of a security thread embedded in a banknote, a cover film for a banknote with a hole, an applied security strip, a self-supporting transfer element or also in the form of a feature area printed directly onto a document of value.
  • Security elements with a viewing angle-dependent or three-dimensional appearance play a special role in authenticity protection, as these cannot be reproduced even with the most modern copiers.
  • the security elements are equipped with optically variable elements that give the viewer a different image impression from different viewing angles and, for example, show a different color or brightness impression and/or a different graphic motif depending on the viewing angle.
  • machine-readable features such as electrically conductive and/or magnetic layers.
  • publication WO 02/073250 A2 discloses a magnetic thin-film interference device with a color appearance that is dependent on the viewing angle and which, in addition to a thin-film element, also contains a magnetic layer.
  • the security elements are often film elements in which a film web produced is cut into strips and these are then introduced into banknote paper as security threads.
  • optically variable security threads are used as window security threads, the optical effects of which are visible to an observer in window areas.
  • Such security threads are also to be provided with negative markings, they typically have to be produced at a very early stage of production, for example by means of a washing process. A later individualization of the negative markings, for example to indicate a denomination of a bank note, is not possible.
  • color-shifting thin-film elements are usually built up on a carrier film in the layer sequence reflector, dielectric, absorber.
  • the inverted structure can be produced as semi-finished goods and then individualized in a further processing step by creating negative markings.
  • films of this type are not reliably machine-readable, but are at most provided with simple magnetic features, such as the full-surface magnetic layers described in WO 02/073250 A2, which are relatively easy for potential counterfeiters to imitate. Proceeding from this, the invention is based on the object of specifying generic, elongated, optically variable security elements with an attractive visual appearance and high security against forgery.
  • the color-shifting thin-film element is advantageously a three-layer thin-film element, starting from the carrier film in this order consists of an absorber layer, a spacer layer and a segmented reflector layer.
  • the reflector layer is segmented and consists of segments that contain reflector layer material (coverage areas) and segments that are free of reflector layer material (cutouts).
  • the reflector layer is preferably first applied over the entire surface and then removed again in certain areas in order to form the desired recesses in the reflector layer.
  • the reflector layer is preferably opaque and consists in particular of metal, for example aluminum. The region-wise removal of the reflector layer can take place in particular by imprinting a resist lacquer and subsequent etching or by imprinting an etching lacquer.
  • one of the significant advantages of the proposed structure is that the vapor deposition of the spacer layer, which is usually associated with strong heat exposure, takes place before the creation of the recesses in the reflector layer, so that the heat exposure caused Shrinkage of the film carrier can have no adverse effects on the position and location of the recesses.
  • the magnetic materials of the multiple magnetic coding can therefore be applied to the covering areas of the reflector layer very precisely and without the need to provide large registration tolerances.
  • the magnetic materials of the multiple magnetic coding are advantageously arranged in register with the covering areas of the reflector layer.
  • the magnetic materials of the multiple magnetic coding are particularly preferably arranged with a small register tolerance to the edges of the covering areas. For example, with a 12 gm thick carrier film, the distance between the magnetic areas and the negative markings in the longitudinal direction of the security element can be only 0.9 mm, while in conventional designs a distance of about 1.5 mm would have to be provided because of the register fluctuations.
  • the different magnetic materials of the multiple magnetic coding can be arranged next to one another in spaced apart magnetic areas, but alternatively or additionally they can also be arranged completely or partially one above the other. Mixed areas can also be provided in which the two or more of the different magnetic materials are mixed.
  • the magnetic areas can represent the bits of a coding, but b-adic representations with b greater than 2 can also be represented.
  • the multiple magnetic coding preferably specifies at least one currency, one series, one denomination and/or one batch of the security element.
  • the different magnetic materials of the multiple magnetic coding have different magnetic properties.
  • one of the magnetic materials may be high coercivity, particularly with a coercivity above 1000 Oe (80 kA/m) or even above 2000 Oe (160 kA/m)
  • another of the magnetic materials may be low coercive, particularly with a coercivity below 500 Oe (40 kA/m) or even below 350 Oe (28 kA/m).
  • the difference in the coercivity of the two materials is preferably above 1000 Oe (80 kA/m), more preferably even above 2000 Oe (160 kA/m) or even above 3000 Oe (240 kA/m).
  • the multiple magnetic coding is preferably arranged above, but not directly on the reflector layer.
  • at least one barrier or protective layer is provided between the reflector layer and the magnetic material, since with many material combinations corrosion could otherwise occur in circulation due to the formation of local elements.
  • Some magnetic materials have little or no inherent color and therefore often do not require a dedicated top layer for visual lamination.
  • the luminescence coating mentioned elsewhere is usually sufficient to prevent the magnetic paint from showing through on the back of the thread.
  • the security element contains a luminescence layer, which is preferably arranged above the multiple magnetic coding as viewed from the carrier film and can thus also serve as a cover layer for magnetic materials without a particularly dark inherent color.
  • the luminescent layer can be present over the entire area or only in certain areas and can in particular represent a single-colored or multicolored fluorescent layer.
  • a luminescence layer that is present in certain areas can also be registered with the negative identifiers and/or the magnetic areas of the multiple magnetic coding.
  • the security element can be combined with other security features.
  • the separate layer applied to the flat carrier film for example a lacquer layer, microscopic structures, in particular diffractive relief structures (holograms) or radiation-optically effective relief structures (micromirrors) are provided.
  • the structures are advantageously formed by embossing.
  • the use of separately optimized heat-seal adhesives for the two main surfaces ensures, on the one hand, the clear visibility of the optical authenticity features of the thread in window areas (due to the high transparency and smooth surface of the first adhesive) and, on the other hand, improves the adhesion of the thread in the paper (due to the particularly high adhesive strength of the second adhesive) and thus reduces waste during paper production, increases circulation stability and makes manipulation by counterfeiters more difficult.
  • the elongate security element can be a security thread or security band, but is particularly preferably a window security thread for embedding in a document of value, in particular a bank note.
  • the invention also includes a data carrier with a security element of the type described.
  • the data carrier can in particular be a document of value, such as a banknote, in particular a paper banknote, a polymer banknote or a foil composite banknote, a share, a bond, a certificate, a voucher , a check, a premium ticket, but also an identification card, such as a credit card, a bank card, a cash card, an authorization card, an ID card or a passport personalization page.
  • the invention also includes a method for producing an elongated, optically variable security element, in particular of the type described above, in which a flat, light-transmissive carrier film is provided, a color-shifting thin-layer element is formed on the carrier film, by starting from the carrier film in this order an absorber layer , a spacer layer and a segmented reflector layer are generated, wherein the segmented reflector layer is generated with coverage regions without recesses and recesses in the form of negative characteristics, and a machine-readable multi-magnetic encoding is formed, which is formed from two or more different magnetic materials, each in be arranged in the covering areas of the reflector layer.
  • the reflector layer is preferably first applied over the entire surface and then removed again in certain areas in order to form desired gaps in the reflector layer and thereby produce a segmented reflector layer.
  • the spacer layer is applied in particular in a vapor deposition process.
  • the carrier film is exposed to increased temperatures, which leads to longitudinal and/or transverse shrinkage of the carrier film.
  • FIG. 1 shows a schematic representation of a banknote which, in addition to other security features, is equipped with a window security thread according to the invention
  • Fig. 2 shows the window security thread of Fig. 1 schematically in cross section
  • FIG. 1 shows a schematic representation of a banknote 10 that is equipped with a plurality of different security features and, in particular, contains a first printing element 12-A, a second printing element 12-B, a watermark 18 and a window security thread 16 partially embedded in the banknote paper 14.
  • the subject matter of the present invention is in particular the special structure of the window security thread 16, which shows a color shift effect in its window areas when viewed from above, which shows negative markings when viewed through and which is also designed to be machine-readable by means of a visually unrecognizable multiple magnetic coding.
  • FIGS. 2 and 3 show the structure and production of the security thread 16 according to the invention in more detail with reference to FIGS. 2 and 3, with FIG. 2 showing the security thread 16 schematically in cross section and FIG. 3 showing intermediate steps in the production of the security thread.
  • the security thread 16 is shown in FIG. 2 in the orientation in which it is embedded in the banknote 10 of FIG and through the carrier film. After embedding, the opposite underside of the thread U is the inside of the thread in the banknote paper 14 .
  • the window security thread 16 contains as a carrier film 20 a transparent film 20 only about 9 ⁇ m thick, for example made of PET.
  • the structure according to the invention allows the machine-readable magnetic areas and the negative identifiers to be aligned with one another with register accuracy, despite a large amount of film shrinkage due to production, and this makes it possible to use such thin carrier films for the first time.
  • a color-shifting thin-film element 22 is applied to one side of the carrier film 20 and, starting from the carrier film, has an absorber layer 24 made of chromium, a dielectric spacer layer 26 made of SiO x and an opaque reflector layer 28 made of aluminum 28 in this order.
  • the reflector layer 28 is segmented and has, on the one hand, covering areas 30 without gaps and, on the other hand, gaps 32 in the form of negative identifiers, for example in the form of the currency and the denomination of the bank note.
  • a congruent resist lacquer layer 34 On the covering areas 30 of the reflector layer 28 there is a congruent resist lacquer layer 34 on which a primer layer 36 for the magnetic materials 42, 44 is arranged in certain areas.
  • An important element of the present invention is the multiple magnetic coding 40 applied to the primer layer 36, which in the exemplary embodiment consists of magnetic areas 42, 44 arranged spaced apart next to one another, the magnetic areas 42 being made of high-coercive magnetic material and the magnetic areas 44 being made of low-coercive magnetic material.
  • the arrangement and sequence of the high-coercive magnetic areas 42 and the low-coercive magnetic areas form a coding which, in the exemplary embodiment, comprises three codes, namely a first one, through all magnetic areas 42, 44 code formed, a second code formed only by the high-coercive magnetic areas 42 and a third code formed only by the low-coercive magnetic areas 44.
  • the magnetic areas 42, 44 of the multiple magnetic coding 40 are overprinted with a layer 46 of highly reflective silver paint, which is applied essentially congruently with the primer layer 36, in order to ensure that the magnetic areas do not appear as dark after the thread has been embedded in the banknote 10 Areas on the back of the banknote show through.
  • an approximately 9 ⁇ m thick transparent film for example made of PET, is provided as carrier film 20 and vapor-deposited over the entire surface with an absorber layer 24 made of chromium.
  • a full-area dielectric spacer layer 26 made of SiO x is then vapor-deposited onto the absorber layer and finally a full-area opaque reflector layer 28 made of aluminum is vapor-deposited on the spacer layer in order to form the initially unstructured color-shifting thin-film element 22 on the carrier film 20 .
  • a primer layer 36 is first printed onto the resist layer 34 and then the magnetic areas made of high-coercive magnetic material 42 or low-coercive magnetic material 44 are printed onto the primer layer in the position and size required for the coding.
  • the multiple magnetic coding can also be produced by counter-laminating a second film printed with the desired magnetic material areas.
  • the magnetic areas 42, 44 are then overprinted with a layer 46 of highly reflective silver paint in order to prevent the dark magnetic material from showing through on the subsequent reverse side of the thread U.
  • the structure obtained in this way is overprinted with a full-area luminescent layer 50, as shown in FIG. 3(d).
  • Other functional layers known per se, such as protective lacquer layers, adhesion promoters and the like, can be provided, but these are not essential for the present invention and are therefore not discussed further here.
  • the entire sequence of layers including the carrier film 20 is provided on its opposite sides with a layer of a hot-seal adhesive 52 or 54, wherein the two layers 52, 54 can be formed from the same or preferably from different hot-seal adhesives, as already described above.
  • the magnetic areas 42, 44 of the magnetic coding can each be applied with small tolerances close to the limits of the covering areas 30 because the negative markings are not influenced by the film shrinkage.
  • significantly more space is available on the security element for the magnetic areas 42, 4, which has proven to be particularly advantageous in particular in the case of multiple magnetic codings, which require a large amount of space due to the use of several different magnetic materials.
  • the area of the covering regions 30 located between the cutouts 32 can also be better utilized, so that there is greater design freedom for the design of the security thread.
  • the multiple magnetic coding 40 comprises magnetic areas 42, 44 arranged spaced apart next to one another, each of which consists of different magnetic materials with different magnetic properties.
  • FIG. 4(c) shows an embodiment of a multiple magnetic coding 72, in which the different magnetic materials 42, 44 are arranged partially overlapping, at least for some of the areas.
  • An encoding with partially overlapping arrangement according to Fig. 4(c) can also contain completely overlapping elements according to Fig. 4(b).
  • a multiple magnetic code 74 can also be formed by magnetic areas each containing a mixture of two different magnetic materials 42, 44, as illustrated in FIG. 4(d).
  • the different magnetic materials 42, 44 can also form a homogeneous mixed material.
  • FIG. 5 illustrates a further exemplary embodiment of the invention, with FIGS. 5(a) and (b) showing intermediate steps in the production of the security thread 80 and FIG. 5(c) showing the finished security thread in cross section.
  • an approximately 12 gm thick transparent PET film is provided as carrier film 20 and, as already described in connection with FIG. 3(a), each has an absorber layer 24 made of chromium, a dielectric spacer layer, over the entire surface 26 made of SiO x and a reflector layer 28 made of aluminum, in order to form a color-shifting thin-film element 22 on the carrier film 20 .
  • any remaining etching lacquer 82 is washed off, so that the layer sequence shown in FIG. 5(b) with a thin-layer element 22 with a segmented reflector layer 28 is produced.
  • both layers 52, 54 can be formed from the same heat-seal adhesive or, with particular advantage, from different heat-seal adhesives optimized separately for high transparency or strong adhesion.
  • Areas with resist resist-free areas , 72, 74 multiple magnetic coding

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  • Credit Cards Or The Like (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)

Abstract

L'invention concerne un élément de sécurité allongé optiquement variable (16) pour protéger des objets de valeur, comprenant un film support translucide plat (2); un élément film mince à décalage de couleur (22) sur le film support (20), ledit élément présentant, dans l'ordre suivant, à partir du film support (20) : une couche absorbante (24), une couche d'espacement (26) et une couche de réflecteur segmentée (28), la couche de réflecteur segmentée ayant des régions de recouvrement (30) sans découpes, et des découpes (32) sous la forme de marques négatives; et un codage magnétique multiple lisible par machine (40), qui est formé à partir d'au moins deux matériaux magnétiques différents (42, 44), qui sont chacun disposés dans les régions de recouvrement (30) de la couche de réflecteur (28).
PCT/EP2020/025374 2020-08-14 2020-08-14 Élément de sécurité allongé et procédé de production d'un élément de sécurité allongé WO2022033653A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2020/025374 WO2022033653A1 (fr) 2020-08-14 2020-08-14 Élément de sécurité allongé et procédé de production d'un élément de sécurité allongé

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2020/025374 WO2022033653A1 (fr) 2020-08-14 2020-08-14 Élément de sécurité allongé et procédé de production d'un élément de sécurité allongé

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WO2022033653A1 true WO2022033653A1 (fr) 2022-02-17

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022003656A1 (de) 2022-10-04 2024-04-04 Giesecke+Devrient Currency Technology Gmbh Sicherheitselement mit einem maschinenlesbaren Code sowie Verfahren zur Echtheitsprüfung desselben

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19731968A1 (de) * 1997-07-24 1999-01-28 Giesecke & Devrient Gmbh Sicherheitsdokument
WO2002073250A2 (fr) 2001-03-09 2002-09-19 Sicpa Holding S.A. Pigment ou dispositif d'interference en film mince magnetique et son procede de fabrication, encre d'impression ou composition de revetement, document de securite et utilisation d'un tel dispositif
DE102004039355A1 (de) * 2004-08-12 2006-02-23 Giesecke & Devrient Gmbh Sicherheitselement und Verfahren zu seiner Herstellung
DE102008032224A1 (de) * 2008-07-09 2010-01-14 Giesecke & Devrient Gmbh Sicherheitselement
EP2287011A2 (fr) * 2004-04-30 2011-02-23 Giesecke & Devrient GmbH Elément de sécurité et son procédé de fabrication
DE102009042022A1 (de) * 2009-09-21 2011-03-24 Giesecke & Devrient Gmbh Langgestrecktes Sicherheitselement mit maschinenlesbaren magnetischen Bereichen
WO2012025216A1 (fr) * 2010-08-27 2012-03-01 Hueck Folien Ges.M.B.H. Document de valeur avec élément de sécurité au moins partiellement incorporé
EP2578414A1 (fr) * 2011-10-04 2013-04-10 Hueck Folien Ges.m.b.H. Elément de sécurité ayant un effet de bascule colorée, son procédé de fabrication et son utilisation
DE102015003185A1 (de) * 2014-10-29 2016-05-04 Giesecke & Devrient Gmbh Sicherheitselement mit farbkippendem Dünnschichtelement

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19731968A1 (de) * 1997-07-24 1999-01-28 Giesecke & Devrient Gmbh Sicherheitsdokument
WO2002073250A2 (fr) 2001-03-09 2002-09-19 Sicpa Holding S.A. Pigment ou dispositif d'interference en film mince magnetique et son procede de fabrication, encre d'impression ou composition de revetement, document de securite et utilisation d'un tel dispositif
EP2287011A2 (fr) * 2004-04-30 2011-02-23 Giesecke & Devrient GmbH Elément de sécurité et son procédé de fabrication
DE102004039355A1 (de) * 2004-08-12 2006-02-23 Giesecke & Devrient Gmbh Sicherheitselement und Verfahren zu seiner Herstellung
DE102008032224A1 (de) * 2008-07-09 2010-01-14 Giesecke & Devrient Gmbh Sicherheitselement
DE102009042022A1 (de) * 2009-09-21 2011-03-24 Giesecke & Devrient Gmbh Langgestrecktes Sicherheitselement mit maschinenlesbaren magnetischen Bereichen
WO2012025216A1 (fr) * 2010-08-27 2012-03-01 Hueck Folien Ges.M.B.H. Document de valeur avec élément de sécurité au moins partiellement incorporé
EP2578414A1 (fr) * 2011-10-04 2013-04-10 Hueck Folien Ges.m.b.H. Elément de sécurité ayant un effet de bascule colorée, son procédé de fabrication et son utilisation
DE102015003185A1 (de) * 2014-10-29 2016-05-04 Giesecke & Devrient Gmbh Sicherheitselement mit farbkippendem Dünnschichtelement

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022003656A1 (de) 2022-10-04 2024-04-04 Giesecke+Devrient Currency Technology Gmbh Sicherheitselement mit einem maschinenlesbaren Code sowie Verfahren zur Echtheitsprüfung desselben

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