EP3279005B1 - Method and transfer film for the transmission of motive shaped security elements on a target substrate - Google Patents

Method and transfer film for the transmission of motive shaped security elements on a target substrate Download PDF

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Publication number
EP3279005B1
EP3279005B1 EP17001297.5A EP17001297A EP3279005B1 EP 3279005 B1 EP3279005 B1 EP 3279005B1 EP 17001297 A EP17001297 A EP 17001297A EP 3279005 B1 EP3279005 B1 EP 3279005B1
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EP
European Patent Office
Prior art keywords
transfer
security
foil
layer
regions
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP17001297.5A
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German (de)
French (fr)
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EP3279005A1 (en
Inventor
Josef Schinabeck
André Gregarek
Winfried HOFFMÜLLER
Christoph Gebauer
Christoph Mengel
Mario Keller
Matthias Pfeiffer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giesecke and Devrient Currency Technology GmbH
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Giesecke and Devrient Currency Technology GmbH
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Publication of EP3279005A1 publication Critical patent/EP3279005A1/en
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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
    • B42D25/20—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
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/24—Passports
    • 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
    • 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
    • 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
    • B42D25/45—Associating two or more layers
    • B42D25/465—Associating two or more layers using chemicals or adhesives
    • B42D25/47—Associating two or more layers using chemicals or adhesives using adhesives

Definitions

  • the invention relates to a method and a transfer film for transferring motif-shaped security elements to a target substrate.
  • Data carriers such as documents of value or identity documents, or other objects of value, such as branded articles, are often provided with security elements for security purposes, which allow the authenticity of the data carriers to be checked and which at the same time serve as protection against unauthorized reproduction.
  • the security elements typically have several layers, including at least one functional layer, for example in the form of a hologram, an optically variable coating or a metallized embossed structure.
  • the security elements are often glued onto the desired data carrier as the target substrate by means of an adhesive layer, in particular a heat seal lacquer.
  • the layers that form the layer structure of the security elements are usually first applied to an endless film serving as a carrier and transferred from there to the target substrate.
  • the layer structure of the security elements contains a carrier film which also forms an integral part of the security elements after the transfer. If a security element is used, for example, to close a continuous opening of a data carrier, it must be designed to be self-supporting and particularly stable.
  • such an integral carrier film already allows the individual transfer elements to be provided in the desired outline shape on the transfer film, since after the full-surface production of the layer structure and suitable punching, the intermediate areas (often also as a grid) between the transfer elements to be transferred can be removed from the transfer film with the aid of the carrier film (so-called stripping). In this way it can in particular be avoided that fragments of the security element layer structure contaminate the target substrate.
  • security elements that are as thin as possible, in particular security elements without an integrated carrier film, on a data carrier.
  • security elements due to the intrinsically low stability of their layer structure, such thin security elements cannot be prepared in a simple manner in motif form on a transfer film and transferred from the latter to a target substrate.
  • a strip-like continuous film and its use are, for example, from the print layer EP 2 848 425 A2 known.
  • DE 4130896 A1 shows a diffraction structure on a transfer carrier, which is arranged between two layers of lacquer.
  • WO 2010/031543 A1 discloses a two-layer carrier film for transfer elements.
  • a stabilizing layer is provided for the color layer to be transferred.
  • the object of the invention is to specify a method with which motif-shaped security elements can be easily transferred to a target substrate even without an integrated carrier film.
  • the invention is also intended to provide an associated transfer film for transferring motif-shaped security elements.
  • a transfer film according to the invention for transferring motif-shaped security elements from transfer areas of the transfer film to a target substrate is defined in claim 1.
  • the tough lacquer layer provides the necessary stability to be able to detach the stable lacquer grid from the temporary carrier film in the non-transmission areas.
  • the security element layer structure thus does not have to have a carrier film and can be made particularly thin. Accordingly, the security element layer structure particularly advantageously contains no film layer, in particular no carrier film.
  • the layers of the security element layer structure are in particular formed over the entire surface.
  • the stable lacquer grid is in a separate, in particular punched, shape and forms separate motif-shaped transmission areas and non-transmission areas.
  • the non-transmission areas are preferably coherent and can therefore be detached from the temporary carrier film over a large area.
  • the separation is preferably carried out by a punch, for example a mechanical punch or a laser punch.
  • a dividing line that extends through the security element layer structure, in particular punched, can extend into the temporary carrier film.
  • the security element layer structure is thus sufficiently safely completely separated from the paint grid.
  • the temporary carrier film has a first film layer and a second film layer.
  • the first film layer serves in particular as a film layer that can be punched and the second film layer serves as a non-punched film layer.
  • the dividing line created during the separation between the transfer areas and the non-transfer areas extends (only) into the first layer of film.
  • the second film layer prevents a temporary carrier film punched out in the first film layer from tearing.
  • the stabilizing layer can also be structured in terms of height and, in the event that it is only present in some areas, in particular with a layer thickness decreasing in the edge areas.
  • the extensions of the stabilization layer can also extend into the transmission areas and after removal of the lacquer grid form lateral anchoring elements in the left-over security element areas, which can serve to anchor the transferred security elements on the target substrate.
  • the dividing lines in particular produced by stamping, can also lie in the case of a height-structured formation of a stabilization layer which is only present in certain areas such that the stabilization layer is only present in the non-transmission areas and does not protrude into the transmission areas.
  • a height-structured stabilization layer can generally have linearly rising and falling partial areas, step-like rising and falling partial areas, and / or curved rising and falling partial areas.
  • the stabilization layer is at a minimum distance from the transmission areas, which can also be of different sizes in different spatial directions and at corners of the transmission areas.
  • a maximum extension of the areas protruding into the transmission areas can be provided. This maximum extent can be defined absolutely or also relative to the size of the transmission areas.
  • Adjacent transmission areas can also advantageously have a minimum distance.
  • the shape of the stabilization layer areas can follow the shape of the transmission areas or can be independent of this. For example, the edge of the transmission areas can have a curved curve, but the stabilization layer is present with straight edges. In such a case, a minimum distance between the stabilization layer and the transmission area can ensure that there is sufficient space is available for cutting or dividing lines by mechanical punching or lasers.
  • the stabilizing layer can be arranged, viewed from the temporary carrier film, below or above the security element layer structure, the latter option being currently preferred.
  • the stabilization layer and the security element layer structure can be arranged directly one above the other, but intermediate layers, in particular a primer layer, can also be provided between the stabilization layer and the security element layer structure.
  • the stabilizing layer preferably has a layer thickness between 4 ⁇ m and 10 ⁇ m, preferably between 4 ⁇ m and 8 ⁇ m. Because of the required high layer thickness, the stabilizing layer also advantageously has a high solids content, in particular of 90% or more. The stabilization layer can even be a 100% system.
  • the stabilizing layer is particularly advantageously in the form of a tough UV-curing or electron-beam-curing lacquer layer.
  • a UV-curing lacquer can be cured homogeneously over the entire surface, but can also be cured differently in different areas by different exposure, for example partially or even in stages with different UV light intensity, for example using an exposure mask.
  • the degree of hardening can be 100% or just 75-95%.
  • a stabilization layer that is present in some areas can have less curing in its central areas than in the edge areas. For example, the degree of hardening can continuously increase from 75% in the central area to 100% in the peripheral areas. Different areas Curing can be achieved in particular using a semi-transparent UV mask with UV transmission that differs in some areas.
  • the stabilization layer advantageously has an elongation at break of more than 2.5%, preferably more than 3%, particularly preferably more than 4% or even more than 5%.
  • the breaking load of the stabilization layer is expediently above 15 N / mm 2 .
  • the security element layer structure can be present over the entire surface of the transfer film or can itself be applied in a motif-like manner or structured.
  • the entire layer structure on the transfer film is advantageously heat sealable.
  • the security element layer structure can comprise an (embossing lacquer) layer, in particular an embossed and / or metallized layer, which lies on the temporary carrier film and which already has a sufficiently low adhesion to the temporary carrier film for transfer and / or detachment.
  • an (embossing lacquer) layer in particular an embossed and / or metallized layer, which lies on the temporary carrier film and which already has a sufficiently low adhesion to the temporary carrier film for transfer and / or detachment.
  • the motif shape of the security element is advantageously freely selectable.
  • the security element can be, for example, a polygon, in particular a triangle, a - in particular non-rectangular - quadrangle or a polygon with at least five corner points.
  • the motif shape can at least partially have a non-linear edge and / or rounded corners and / or corner points, the edge in particular at least partially running round (circle, oval, ...) and / or having corner points (coat of arms, ).
  • the motif shape of the security element can preferably correspond to the shape that is visually visible to a viewer of the security element.
  • the detachment of the paint grid in the non-transmission areas can be supported by an additional non-stick coating or by a locally more easily removable release layer.
  • the adhesion of the paint grid to the non-stick coating can be chosen to be smaller than the adhesion of the security element to the release layer or the adhesion of the non-stick coating to the temporary carrier film can be chosen to be smaller than the adhesion of the release layer to the temporary carrier film.
  • the invention also includes a method for transferring motif-shaped security elements onto a target substrate as defined in claim 13.
  • the stabilizing layer can be applied either before or after the generation of the security element layer structure.
  • the separation step is preferably carried out by punching, in particular mechanically or using a laser.
  • a dividing line is preferably generated which extends through the security element layer structure into the temporary carrier film.
  • the temporary carrier film can be designed as an (at least) double-layer film, the dividing line only extending into the first film layer.
  • the security element layer structure is thus reliably completely separated, so that a punching with higher tolerances in the punching depth can also be used.
  • the carrier film Only optionally does the carrier film have a release layer which supports the detachment of the non-transmission areas and / or the transmission of the transmission areas.
  • Figure 1 shows a schematic representation of a banknote 10 with a thin, motif-shaped security element 12 which is glued to the banknote paper in the form of a thin transfer element without a carrier film.
  • the security element 12 typically consists of a layer structure with a plurality of layers, such as an embossing lacquer layer and a metallization that may only be present in some areas.
  • the exact one Layer structure of the security element 12 is not essential for the present invention and is therefore not described in more detail. It is only important that the layer structure transferred to the banknote 10 does not contain a carrier film, so that the security element 12 can be made particularly thin.
  • the transfer film 20 contains a temporary carrier film 22 which provides the necessary stability when producing the layer structure of the security element and during the transfer process.
  • the carrier film 22 is referred to as temporary, because it does not remain permanently in the layered composite of the security elements, but is instead pulled off after the transfer to the target substrate.
  • the temporary carrier film 22 can optionally be provided with a release layer 24, on which the layer structure 26 of the desired security elements 12 is generated and which enables the layer structure 26 or the temporary carrier film 22 to be separated later in a simple manner.
  • the release layer 24 can be, for example, a UV lacquer layer, a wax layer or a release lacquer layer.
  • the security element layer structure 26 consists of several layers, the exact nature of which is not essential for the present invention except for the absence of a carrier film.
  • the bottom layer of the security element layer structure 26 is preferably an embossing lacquer layer, which is already one for one Transfer and / or detachment has sufficiently low adhesion to the temporary carrier film 22.
  • the layers of the layer structure 26 are typically produced over the entire area on the temporary carrier film 22.
  • the layer structure 26 In order to be able to transfer the generated security element layer structure 26 to the target substrate only in the desired transmission areas 40, in the present case in the motif form of the security element 12, the layer structure 26 must be separated into transmission areas 40 and non-transmission areas 42, and those lying between the transmission areas 40 Non-transmission areas 42 are removed before the security elements are applied.
  • a stabilizing layer 28 in the form of a viscous UV lacquer layer is applied to the security element layer structure 26, which is firmly connected to the security element layer structure 26 and forms a stable lacquer grid 30 therewith.
  • the stabilizing layer 28 has just been applied in the form of the negative of the desired motif shape of the security elements 12, it is therefore precisely in the non-transfer areas 42 in which no security element layer structure 26 is to be transferred to the banknote paper during the transfer. In contrast, no stabilizing layer 28 is applied in the transmission areas 40 in which the security element layer structure 26 is to be transferred to the banknote paper.
  • the stabilization layer 28 has a high elongation at break of 6.37% and a large breaking load of 15.3 N / mm 2 .
  • the transfer film 20 further contains two primer layers 32, 34 with a thickness of 1 .mu.m or 2 .mu.m and a 6 .mu.m thick heat sealing lacquer layer 36 for adhering the security element layer structure 26 to the target substrate.
  • the lacquer grid 30 applied to the carrier film 22 is separated in the form of the motif-shaped transfer areas 40 and the contiguous non-transfer areas 42, for example by punching, in particular using a mechanical punch or a laser punch.
  • the punching is expediently carried out into the optional release layer 24 in order to enable a clean detachment.
  • the dividing line can extend into the temporary carrier film, in particular into a first film layer of two film layers of the temporary carrier film. The two layers of film can be laminated together.
  • the non-punched second film layer prevents the temporary carrier film from tearing, in particular in further steps, such as removing (detaching) the non-transmission areas and / or transferring the transmission areas.
  • the transfer film 20 produced in this way can be temporarily stored for later processing or can be processed immediately.
  • the lacquer grid 30 in the non-transfer areas 42 is then removed before application of the security elements 12, so that only the security element layer structure 26 present in the transfer areas 40 remains on the temporary carrier film 22, as in FIG Fig. 3 illustrated.
  • This removal of the lacquer grid 30 from the non-transfer areas 42 is made possible by the tough stabilizing layer 28, which gives the material of the non-transfer areas 42 the necessary stability for the detachment process.
  • Figure 4 shows the appearance of the transfer film 20 after removal of the lacquer grid 30 in supervision.
  • the security element layer structure 26 is now in the desired motif shape in the transfer areas 40, so that the security elements 12 can be motif-like transferred to the target substrate despite the full-surface action of the heating roller and calender.
  • the temporary carrier film 22 is detached, possibly with the aid of the only optional release layer 24, so that only the thin security element layer structure 26 and the thin primer layers 32, 34 remain on the target substrate.
  • FIG. 5 A modification of the transfer film of the Fig. 2 is in Fig. 5 illustrated.
  • the stabilization layer 52 of the transfer film 50 is essentially also only present in the non-transmission areas 42, in contrast to the exemplary embodiment in FIG Fig. 2
  • the stabilization layer 52 is designed with a decreasing layer thickness in the edge regions 54, so that extensions 56 of the stabilization layer 52 extend a few millimeters into the transmission regions 40.
  • the extensions 56 form in the left security elements 12 side tabs made of stabilization layer material, which form edge anchoring elements after transfer to the target substrate, which support anchoring of the security elements 12 on the target substrate.
  • release layer 24 is only optionally available.
  • the punching can also be carried out into the — optionally double-layered — temporary carrier layer 22.

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Description

Die Erfindung betrifft ein Verfahren und eine Transferfolie zum Übertragen von motivförmigen Sicherheitselementen auf ein Zielsubstrat.The invention relates to a method and a transfer film for transferring motif-shaped security elements to a target substrate.

Datenträger, wie etwa Wert- oder Ausweisdokumente, oder andere Wertgegenstände, wie etwa Markenartikel, werden zur Absicherung oft mit Sicherheitselementen versehen, die eine Überprüfung der Echtheit der Datenträger gestatten und die zugleich als Schutz vor unerlaubter Reproduktion dienen.Data carriers, such as documents of value or identity documents, or other objects of value, such as branded articles, are often provided with security elements for security purposes, which allow the authenticity of the data carriers to be checked and which at the same time serve as protection against unauthorized reproduction.

Die Sicherheitselemente weisen typischerweise mehrere Schichten einschließlich zumindest einer Funktionsschicht auf, beispielsweise in Form eines Hologramms, einer optisch variablen Beschichtung oder einer metallisierte Prägestruktur. Oft werden die Sicherheitselemente nach ihrer Herstellung mittels einer Kleberschicht, insbesondere eines Heißsiegellacks, auf den gewünschten Datenträger als Zielsubstrat aufgeklebt.The security elements typically have several layers, including at least one functional layer, for example in the form of a hologram, an optically variable coating or a metallized embossed structure. After their production, the security elements are often glued onto the desired data carrier as the target substrate by means of an adhesive layer, in particular a heat seal lacquer.

Bei der Herstellung werden die den Schichtaufbau der Sicherheitselemente bildenden Schichten üblicherweise zunächst auf einer als Träger dienenden Endlosfolie aufgebracht und von dort auf das Zielsubstrat übertragen. In manchen Gestaltungen ist es dabei von Vorteil, wenn der Schichtaufbau der Sicherheitselemente eine Trägerfolie enthält, die auch nach der Übertragung einen integralen Bestandteil der Sicherheitselemente bildet. Wird ein Sicherheitselement beispielsweise zum Verschließen einer durchgehenden Öffnung eines Datenträgers eingesetzt, muss es selbstragend und besonders stabil ausgebildet sein. Zudem erlaubt eine solche integrale Trägerfolie die einzelnen Transferelemente bereits auf der Transferfolie in der gewünschten Umrissform bereitzustellen, da nach einer vollflächigen Herstellung des Schichtaufbaus und geeigneter Stanzung die Zwischenbereiche (oft auch als Gitter bezeichnet) zwischen den zu übertragenden Transferelementen mit Hilfe der Trägerfolie von der Transferfolie entfernt werden können (sogenanntes Abgittern). Auf diese Weise kann insbesondere vermieden werden, dass Bruchstücke des Sicherheitselement- Schichtaufbaus das Zielsubstrat verunreinigen.During production, the layers that form the layer structure of the security elements are usually first applied to an endless film serving as a carrier and transferred from there to the target substrate. In some configurations, it is advantageous if the layer structure of the security elements contains a carrier film which also forms an integral part of the security elements after the transfer. If a security element is used, for example, to close a continuous opening of a data carrier, it must be designed to be self-supporting and particularly stable. In addition, such an integral carrier film already allows the individual transfer elements to be provided in the desired outline shape on the transfer film, since after the full-surface production of the layer structure and suitable punching, the intermediate areas (often also as a grid) between the transfer elements to be transferred can be removed from the transfer film with the aid of the carrier film (so-called stripping). In this way it can in particular be avoided that fragments of the security element layer structure contaminate the target substrate.

In anderen Gestaltungen ist es dagegen wünschenswert, möglichst dünne Sicherheitselemente, also insbesondere Sicherheitselement ohne integrierte Trägerfolie auf einem Datenträger anzuordnen. Solche dünnen Sicherheitselemente können allerdings wegen der intrinsisch geringen Stabilität ihres Schichtaufbaus nicht in einfacher Weise in Motivform auf einer Transferfolie vorbereitet und von dieser auf ein Zielsubstrat übertragen werden.In other configurations, on the other hand, it is desirable to arrange security elements that are as thin as possible, in particular security elements without an integrated carrier film, on a data carrier. However, due to the intrinsically low stability of their layer structure, such thin security elements cannot be prepared in a simple manner in motif form on a transfer film and transferred from the latter to a target substrate.

Eine streifenförmige Endlosfolie und deren Verwendung sind beispielsweise aus der Druckschicht EP 2 848 425 A2 bekannt. DE 4130896 A1 zeigt auf einem Transferträger eine Beugungsstruktur, die zwischen zwei Lackschichten angeordnet ist. WO 2010/031543 A1 offenbart eine zweischichtige Trägerfolie für Transferelemente. In WO 2016/026731 A1 wird eine Stabilisierungsschicht für die zu übertragende Farbschicht vorgesehen.A strip-like continuous film and its use are, for example, from the print layer EP 2 848 425 A2 known. DE 4130896 A1 shows a diffraction structure on a transfer carrier, which is arranged between two layers of lacquer. WO 2010/031543 A1 discloses a two-layer carrier film for transfer elements. In WO 2016/026731 A1 a stabilizing layer is provided for the color layer to be transferred.

Ausgehend davon liegt der Erfindung die Aufgabe zugrunde, ein Verfahren anzugeben, mit dem sich motivförmige Sicherheitselemente auch ohne integrierte Trägerfolie in einfacher Weise auf ein Zielsubstrat übertragen lassen. Die Erfindung soll auch eine zugehörige Transferfolie zum Übertragen von motivförmigen Sicherheitselementen bereitstellen.Proceeding from this, the object of the invention is to specify a method with which motif-shaped security elements can be easily transferred to a target substrate even without an integrated carrier film. The invention is also intended to provide an associated transfer film for transferring motif-shaped security elements.

Diese Aufgabe wird durch die Merkmale der unabhängigen Ansprüche gelöst. Weiterbildungen der Erfindung sind Gegenstand der abhängigen Ansprüche.This object is solved by the features of the independent claims. Further developments of the invention are the subject of the dependent claims.

Eine erfindungsgemäße Transferfolie zum Übertragen von motivförmigen Sicherheitselementen aus Übertragungsbereichen der Transferfolie auf ein Zielsubstrat ist in Anspruch 1 definiert.A transfer film according to the invention for transferring motif-shaped security elements from transfer areas of the transfer film to a target substrate is defined in claim 1.

Dabei stellt die zähe Lackschicht die notwendige Stabilität bereit, um das stabile Lackgitter in den Nicht-Übertragungsbereichen von der temporären Trägerfolie ablösen zu können. Der Sicherheitselement-Schichtaufbau muss somit keine Trägerfolie aufweisen und kann besonders dünn ausgebildet werden. Entsprechend enthält der Sicherheitselement-Schichtaufbau mit besonderem Vorteil keine Folienschicht, insbesondere keine Trägerfolie. Die Schichten des Sicherheitselement-Schichtaufbaus sind insbesondere vollflächig ausgebildet.The tough lacquer layer provides the necessary stability to be able to detach the stable lacquer grid from the temporary carrier film in the non-transmission areas. The security element layer structure thus does not have to have a carrier film and can be made particularly thin. Accordingly, the security element layer structure particularly advantageously contains no film layer, in particular no carrier film. The layers of the security element layer structure are in particular formed over the entire surface.

In einer vorteilhaften Ausgestaltung liegt das stabile Lackgitter in getrennter, insbesondere gestanzter, Form vor und bildet voneinander getrennte motivförmige Übertragungsbereiche und Nicht-Übertragungsbereiche aus. Die Nicht-Übertragungsbereiche sind vorzugswiese zusammenhängend ausgebildet und können daher großflächig gemeinsam von der temporären Trägerfolie abgelöst werden. Bevorzugt erfolgt die Trennung durch eine Stanze, beispielsweise eine mechanische Stanze oder eine Laserstanze.In an advantageous embodiment, the stable lacquer grid is in a separate, in particular punched, shape and forms separate motif-shaped transmission areas and non-transmission areas. The non-transmission areas are preferably coherent and can therefore be detached from the temporary carrier film over a large area. The separation is preferably carried out by a punch, for example a mechanical punch or a laser punch.

Eine durch den Sicherheitselement-Schichtaufbau reichende, insbesondere gestanzte, Trennlinie kann bis in die temporäre Trägerfolie hinein reichen. Der Sicherheitselement-Schichtaufbau ist somit hinreichend sicher vollständig vom Lackgitter getrennt.A dividing line that extends through the security element layer structure, in particular punched, can extend into the temporary carrier film. The security element layer structure is thus sufficiently safely completely separated from the paint grid.

In einer bevorzugten Variante weist die temporäre Trägerfolie eine erste Folienlage und eine zweite Folienlage auf. Die erste Folienlage dient insbesondere als anstanzbare Folienlage und die zweite Folienlage als ungestanzte Folienlage. Die beim Trennen erzeugte Trennlinie zwischen den Übertragungsbereichen und den Nicht-Übertragungsbereichen reicht (nur) bis in die erste Folienlage hinein. Die zweite Folienlage verhindert, dass eine - in der ersten Folienlage - angestanzte temporäre Trägerfolie reißt.In a preferred variant, the temporary carrier film has a first film layer and a second film layer. The first film layer serves in particular as a film layer that can be punched and the second film layer serves as a non-punched film layer. The dividing line created during the separation between the transfer areas and the non-transfer areas extends (only) into the first layer of film. The second film layer prevents a temporary carrier film punched out in the first film layer from tearing.

Die Stabilisierungsschicht kann auch höhenstrukturiert sein und im Fall, dass sie nur bereichsweise vorliegt, insbesondere mit einer in den Randbereichen abnehmenden Schichtdicke ausgebildet sein. Die Ausläufer der Stabilisierungsschicht können sich dabei auch in die Übertragungsbereiche hinein erstrecken und nach einer Entfernung des Lackgitters seitliche Verankerungselemente in den stehengelassenen Sicherheitselementbereichen bilden, die einer Verankerung der übertragenen Sicherheitselemente auf dem Zielsubstrat dienen können.The stabilizing layer can also be structured in terms of height and, in the event that it is only present in some areas, in particular with a layer thickness decreasing in the edge areas. The extensions of the stabilization layer can also extend into the transmission areas and after removal of the lacquer grid form lateral anchoring elements in the left-over security element areas, which can serve to anchor the transferred security elements on the target substrate.

Die insbesondere durch Stanzung erzeugten Trennlinien können auch bei einer höhenstrukturierten Ausbildung einer nur bereichsweise vorliegenden Stabilisierungsschicht so liegen, dass die Stabilisierungsschicht nur in den Nicht-Übertragungsbereichen vorliegt und nicht in die Übertragungsbereiche hineinragt. Eine höhenstrukturierte Stabilisierungsschicht kann allgemein linear ansteigende und abfallende Teilbereiche, stufenförmig ansteigende und abfallende Teilbereiche, und/oder gekrümmt ansteigende und abfallende Teilbereiche aufweisen.The dividing lines, in particular produced by stamping, can also lie in the case of a height-structured formation of a stabilization layer which is only present in certain areas such that the stabilization layer is only present in the non-transmission areas and does not protrude into the transmission areas. A height-structured stabilization layer can generally have linearly rising and falling partial areas, step-like rising and falling partial areas, and / or curved rising and falling partial areas.

Liegt die Stabilisierungsschicht nur bereichsweise vor, kann weiter vorgesehen sein, dass die Stabilisierungsschicht einen Mindestabstand von den Übertragungsbereichen aufweist, welcher in unterschiedlichen Raumrichtungen und an Ecken der Übertragungsbereiche auch unterschiedlich groß sein kann. In Gestaltungen, in denen Ausläufer der Stabilisierungsschicht in die Übertragungsbereiche hineinragen, kann eine maximale Ausdehnung der in die Übertragungsbereiche hineinragenden Bereiche vorgesehen sein. Diese maximale Ausdehnung kann absolut oder auch relativ zur Größe der Übertragungsbereiche definiert sein. Weiter können benachbarte Übertragungsbereiche mit Vorteil einen Mindestabstand aufweisen. Die Form der Stabilisierungsschichtbereiche kann der Form der Übertragungsbereiche folgen oder kann unabhängig von dieser sein. Beispielsweise kann der Rand der Übertragungsbereiche einen gekrümmten Kurvenverlauf aufweisen, die Stabilisierungsschicht aber mit geradlinig begrenzten Rändern vorliegen. In einem solchen Fall kann durch einen Mindestabstand von Stabilisierungsschicht und Übertragungsbereich sichergestellt sein, dass ausreichend Platz für eine Schnittführung bzw. Trennlinienbildung durch mechanische Stanzung oder Lasern zur Verfügung steht.If the stabilization layer is only present in some areas, it can further be provided that the stabilization layer is at a minimum distance from the transmission areas, which can also be of different sizes in different spatial directions and at corners of the transmission areas. In designs in which extensions of the stabilization layer protrude into the transmission areas, a maximum extension of the areas protruding into the transmission areas can be provided. This maximum extent can be defined absolutely or also relative to the size of the transmission areas. Adjacent transmission areas can also advantageously have a minimum distance. The shape of the stabilization layer areas can follow the shape of the transmission areas or can be independent of this. For example, the edge of the transmission areas can have a curved curve, but the stabilization layer is present with straight edges. In such a case, a minimum distance between the stabilization layer and the transmission area can ensure that there is sufficient space is available for cutting or dividing lines by mechanical punching or lasers.

Die Stabilisierungsschicht kann von der temporären Trägerfolie aus gesehen unterhalb oder oberhalb des Sicherheitselement-Schichtaufbaus angeordnet sein, wobei letztgenannte Möglichkeit derzeit bevorzugt ist. Die Stabilisierungsschicht und der Sicherheitselement-Schichtaufbau können direkt übereinander angeordnet sein, es können aber auch Zwischenschichten, insbesondere ein Primerschicht zwischen der Stabilisierungsschicht und dem Sicherheitselement-Schichtaufbau vorgesehen sein.The stabilizing layer can be arranged, viewed from the temporary carrier film, below or above the security element layer structure, the latter option being currently preferred. The stabilization layer and the security element layer structure can be arranged directly one above the other, but intermediate layers, in particular a primer layer, can also be provided between the stabilization layer and the security element layer structure.

Bevorzugt weist die Stabilisierungsschicht eine Schichtdicke zwischen 4 µm und 10 µm, vorzugsweise zwischen 4 µm und 8 µm auf. Aufgrund der erforderlichen hohen Schichtstärke weist die Stabilisierungsschicht zudem mit Vorteil einen hohen Festkörpergehalt, insbesondere von 90% oder mehr auf. Es kann sich bei der Stabilisierungsschicht sogar um ein 100%-System handeln.The stabilizing layer preferably has a layer thickness between 4 μm and 10 μm, preferably between 4 μm and 8 μm. Because of the required high layer thickness, the stabilizing layer also advantageously has a high solids content, in particular of 90% or more. The stabilization layer can even be a 100% system.

Mit besonderem Vorteil liegt die Stabilisierungsschicht in Form einer zähen UV-härtenden oder elektronenstrahlhärtenden Lackschicht vor. Ein UVhärtender Lack kann vollflächig homogen ausgehärtet werden, kann durch unterschiedliche Belichtung aber auch bereichsweise unterschiedlich ausgehärtet werden, etwa teilflächig oder auch gestuft mit unterschiedlicher UV-Lichtstärke, beispielsweise durch eine Belichtungsmaske. Der Aushärtungsgrad kann dabei 100% betragen oder auch nur bei 75-95% liegen. Eine bereichsweise vorliegende Stabilisierungsschicht kann jeweils in ihren Mittenbereichen eine geringere Aushärtung aufweisen als in den Randbereichen. Beispielsweise kann der Aushärtungsgrad von 75% im Mittenbereich kontinuierlich auf 100% in den Randbereichen ansteigen. Bereichsweise unterschiedliche Aushärtungen können insbesondere durch eine semitransparente UV-Maske mit bereichsweise unterschiedlicher UV-Transmission erreicht werden.The stabilizing layer is particularly advantageously in the form of a tough UV-curing or electron-beam-curing lacquer layer. A UV-curing lacquer can be cured homogeneously over the entire surface, but can also be cured differently in different areas by different exposure, for example partially or even in stages with different UV light intensity, for example using an exposure mask. The degree of hardening can be 100% or just 75-95%. A stabilization layer that is present in some areas can have less curing in its central areas than in the edge areas. For example, the degree of hardening can continuously increase from 75% in the central area to 100% in the peripheral areas. Different areas Curing can be achieved in particular using a semi-transparent UV mask with UV transmission that differs in some areas.

Die Stabilisierungsschicht weist vorteilhaft eine Bruchdehnung von mehr als 2,5%, vorzugsweise mehr als 3%, besonders bevorzugt von mehr als 4% oder sogar von mehr als 5% auf. Die Bruchlast der Stabilisierungsschicht liegt zweckmäßig oberhalb von 15 N/mm2.The stabilization layer advantageously has an elongation at break of more than 2.5%, preferably more than 3%, particularly preferably more than 4% or even more than 5%. The breaking load of the stabilization layer is expediently above 15 N / mm 2 .

Der Sicherheitselement-Schichtaufbau kann vollflächig auf der Transferfolie vorliegen oder selbst bereits motivförmig aufgebracht oder strukturiert sein.The security element layer structure can be present over the entire surface of the transfer film or can itself be applied in a motif-like manner or structured.

Der gesamte Schichtaufbau auf der Transferfolie ist mit Vorteil heißsiegelfähig ausgestattet.The entire layer structure on the transfer film is advantageously heat sealable.

Der Sicherheitselement-Schichtaufbau kann eine (Prägelack-)Schicht, insbesondere eine geprägte und/oder metallisierte Schicht, umfassen, die auf der temporären Trägerfolie liegt und die bereits eine für ein Übertragen und/oder Ablösen ausreichend geringe Haftung zur temporären Trägerfolie aufweist.The security element layer structure can comprise an (embossing lacquer) layer, in particular an embossed and / or metallized layer, which lies on the temporary carrier film and which already has a sufficiently low adhesion to the temporary carrier film for transfer and / or detachment.

Vorteilhafterweise ist die Motivform des Sicherheitselements frei wählbar. Das Sicherheitselement kann beispielsweise ein Vieleck sein, insbesondere eine Dreieck, ein - insbesondere nicht-rechteckiges - Viereck oder ein Vieleck mit mindestens fünf Eckpunkten. Die Motivform kann zumindest teilweise einen nicht-linearen Rand und/oder abgerundete Ecken und /oder Eckpunkte aufweisen, wobei der Rand insbesondere zumindest teilweise rund verlaufen (Kreis, Oval,...) und /oder Eckpunkten aufweisen kann (Wappen, ...). Die Motivform des Sicherheitselements kann bevorzugt der optisch für einen Betrachter des Sicherheitselements sichtbaren Form entsprechen. Die Ablösung des Lackgitters in den Nicht-Übertragungsbereichen kann durch eine zusätzliche Antihaftbeschichtung oder durch eine lokal leichter ablösbare Releaseschicht unterstützt werden. Beispielsweise kann die Haftung des Lackgitters an der Antihaftbeschichtung kleiner gewählt werden als die Haftung des Sicherheitselements an der Releaseschicht oder die Haftung der Antihaftbeschichtung an der temporären Trägerfolie kann kleiner gewählt werden als die Haftung der Releaseschicht an der temporären Trägerfolie.The motif shape of the security element is advantageously freely selectable. The security element can be, for example, a polygon, in particular a triangle, a - in particular non-rectangular - quadrangle or a polygon with at least five corner points. The motif shape can at least partially have a non-linear edge and / or rounded corners and / or corner points, the edge in particular at least partially running round (circle, oval, ...) and / or having corner points (coat of arms, ...). The motif shape of the security element can preferably correspond to the shape that is visually visible to a viewer of the security element. The detachment of the paint grid in the non-transmission areas can be supported by an additional non-stick coating or by a locally more easily removable release layer. For example, the adhesion of the paint grid to the non-stick coating can be chosen to be smaller than the adhesion of the security element to the release layer or the adhesion of the non-stick coating to the temporary carrier film can be chosen to be smaller than the adhesion of the release layer to the temporary carrier film.

Die Erfindung enthält auch ein Verfahren zum Übertragen von motivförmigen Sicherheitselementen auf ein Zielsubstrat wie in Anspruch 13 definiert.The invention also includes a method for transferring motif-shaped security elements onto a target substrate as defined in claim 13.

Die Stabilisierungsschicht kann dabei sowohl vor oder nach der Erzeugung des Sicherheitselement-Schichtaufbaus aufgebracht werden. Der Trennschritt erfolgt vorzugsweise durch Stanzen, insbesondere mechanisch oder mittels Laser.The stabilizing layer can be applied either before or after the generation of the security element layer structure. The separation step is preferably carried out by punching, in particular mechanically or using a laser.

Bevorzugt wird eine Trennlinie erzeugt, die durch den Sicherheitselement-Schichtaufbau hindurch bis in die temporäre Trägerfolie reicht. Die temporäre Trägerfolie kann als (mindestens) doppellagige Folie ausgestaltet sein, wobei die Trennlinie nur bis in die erste Folienlage hinein reicht. Der Sicherheitselement-Schichtaufbau wird somit zuverlässig vollständig getrennt, auch eine Stanzung mit einer höheren Toleranzen in der Stanztiefe ist somit verwendbar.A dividing line is preferably generated which extends through the security element layer structure into the temporary carrier film. The temporary carrier film can be designed as an (at least) double-layer film, the dividing line only extending into the first film layer. The security element layer structure is thus reliably completely separated, so that a punching with higher tolerances in the punching depth can also be used.

Lediglich optional weist die Trägerfolie eine Releaseschicht auf, welche das Ablösen der Nicht-Übertragungsbereiche und/ oder das Übertragen der Übertragungsbereiche unterstützt.Only optionally does the carrier film have a release layer which supports the detachment of the non-transmission areas and / or the transmission of the transmission areas.

Weitere Ausführungsbeispiele sowie Vorteile der Erfindung werden nachfolgend anhand der Figuren erläutert, bei deren Darstellung auf eine maßstabs- und proportionsgetreue Wiedergabe verzichtet wurde, um die Anschaulichkeit zu erhöhen.Further exemplary embodiments and advantages of the invention are explained below with reference to the figures, in which they are shown on a scale and accurate reproduction has been omitted to increase clarity.

Es zeigen:

Fig. 1
schematisch eine Banknote mit einem dünnen, motivförmigen Sicherheitselement,
Fig. 2
schematisch eine endlose Transferfolie zum Übertragen motivförmiger Sicherheitselemente auf ein Zielsubstrat im Querschnitt,
Fig. 3
die Transferfolie der Fig. 2 nach dem Entfernen des Lackgitters in den Nicht-Übertragungsbereichen im Querschnitt,
Fig. 4
eine Aufsicht auf die Transferfolie der Fig. 3, und
Fig. 5
eine endlose Transferfolie wie in Fig. 2 nach einem anderen Ausführungsbeispiel der Erfindung.
Show it:
Fig. 1
schematically a banknote with a thin, motif-shaped security element,
Fig. 2
schematically an endless transfer film for transferring motif-shaped security elements to a target substrate in cross section,
Fig. 3
the transfer film of the Fig. 2 after removing the lacquer grid in the non-transmission areas in cross section,
Fig. 4
a supervision of the transfer foil of the Fig. 3 , and
Fig. 5
an endless transfer film like in Fig. 2 according to another embodiment of the invention.

Die Erfindung wird nun am Beispiel der Absicherung von Banknoten und anderen Wertdokumenten erläutert. Figur 1 zeigt dazu eine schematische Darstellung einer Banknote 10 mit einem dünnen, motivförmigen Sicherheitselement 12, das in Form eines dünnen Transferelements ohne Trägerfolie auf dem Banknotenpapier aufgeklebt ist.The invention will now be explained using the example of securing banknotes and other documents of value. Figure 1 shows a schematic representation of a banknote 10 with a thin, motif-shaped security element 12 which is glued to the banknote paper in the form of a thin transfer element without a carrier film.

Das Sicherheitselement 12 besteht typischerweise aus einem Schichtaufbau mit einer Mehrzahl von Schichten, wie etwa einer Prägelackschicht und einer gegebenenfalls nur bereichsweise vorliegenden Metallisierung. Der genaue Schichtaufbau des Sicherheitselements 12 ist für die vorliegende Erfindung nicht wesentlich und daher nicht genauer beschrieben. Bedeutsam ist lediglich, dass der auf die Banknote 10 übertragene Schichtaufbau keine Trägerfolie enthält, so dass das Sicherheitselement 12 besonders dünn ausgebildet sein kann.The security element 12 typically consists of a layer structure with a plurality of layers, such as an embossing lacquer layer and a metallization that may only be present in some areas. The exact one Layer structure of the security element 12 is not essential for the present invention and is therefore not described in more detail. It is only important that the layer structure transferred to the banknote 10 does not contain a carrier film, so that the security element 12 can be made particularly thin.

Um dünne, motivförmige Sicherheitselemente 12 ohne Trägerfolie auf einen Datenträger, wie etwa die Banknote 10 aufbringen zu können, wird erfindungsgemäß eine endlose Transferfolie 20 der in Fig. 2 gezeigten Art eingesetzt.In order to be able to apply thin, motif-shaped security elements 12 without a carrier film to a data carrier, such as the bank note 10, an endless transfer film 20 of the type shown in FIG Fig. 2 shown type used.

Die Transferfolie 20 enthält eine temporäre Trägerfolie 22, die beim Erzeugen des Schichtaufbaus des Sicherheitselements und beim Transferprozess die notwendige Stabilität bereitstellt. Die Trägerfolie 22 wird in dieser Beschreibung als temporär bezeichnet, weil sie nicht dauerhaft im Schichtverbund der Sicherheitselemente verbleibt, sondern nach dem Übertragen auf das Zielsubstrat abgezogen wird. Dazu kann die temporäre Trägerfolie 22 optional mit einer Releaseschicht 24 versehen sein, auf der der Schichtaufbaus 26 der gewünschten Sicherheitselemente 12 erzeugt wird und die in einfacher Weise ein späteres Abtrennen des Schichtaufbaus 26 bzw. der temporären Trägerfolie 22 ermöglicht. Bei der Releaseschicht 24 kann es sich beispielsweise um eine UV-Lackschicht, eine Wachsschicht oder eine Releaselackschicht handeln.The transfer film 20 contains a temporary carrier film 22 which provides the necessary stability when producing the layer structure of the security element and during the transfer process. In this description, the carrier film 22 is referred to as temporary, because it does not remain permanently in the layered composite of the security elements, but is instead pulled off after the transfer to the target substrate. For this purpose, the temporary carrier film 22 can optionally be provided with a release layer 24, on which the layer structure 26 of the desired security elements 12 is generated and which enables the layer structure 26 or the temporary carrier film 22 to be separated later in a simple manner. The release layer 24 can be, for example, a UV lacquer layer, a wax layer or a release lacquer layer.

Der Sicherheitselement-Schichtaufbau 26 besteht je nach dem Typ der gewünschten Sicherheitselemente 12 aus mehreren Schichten, deren genaue Art bis auf das Fehlen einer Trägerfolie für die vorliegende Erfindung allerdings nicht wesentlich ist. Bevorzugt ist die unterste Schicht des Sicherheitselement-Schichtaufbau 26 eine Prägelackschicht, die bereits eine für ein Übertragen und/ oder Ablösen ausreichend geringe Haftung zur temporären Trägerfolie 22 aufweist.Depending on the type of the desired security elements 12, the security element layer structure 26 consists of several layers, the exact nature of which is not essential for the present invention except for the absence of a carrier film. The bottom layer of the security element layer structure 26 is preferably an embossing lacquer layer, which is already one for one Transfer and / or detachment has sufficiently low adhesion to the temporary carrier film 22.

Die Schichten des Schichtaufbaus 26 werden typischerweise vollflächig auf der temporären Trägerfolie 22 erzeugt. Um erzeugten Sicherheitselement-Schichtaufbau 26 nur in den gewünschten Übertragungsbereichen 40, vorliegend in der Motivform des Sicherheitselements 12, auf das Zielsubstrat übertragen zu können, muss der Schichtaufbau 26 in Übertragungsbereiche 40 und Nicht-Übertragungsbereiche 42 getrennt werden, und die zwischen den Übertragungsbereichen 40 liegenden Nicht-Übertragungsbereichen 42 vor der Applikation der Sicherheitselemente entfernt werden.The layers of the layer structure 26 are typically produced over the entire area on the temporary carrier film 22. In order to be able to transfer the generated security element layer structure 26 to the target substrate only in the desired transmission areas 40, in the present case in the motif form of the security element 12, the layer structure 26 must be separated into transmission areas 40 and non-transmission areas 42, and those lying between the transmission areas 40 Non-transmission areas 42 are removed before the security elements are applied.

Zu diesem Zweck ist auf dem Sicherheitselement-Schichtaufbau 26 bereichsweise eine Stabilisierungsschicht 28 in Form einer zähen UV-Lackschicht aufgebracht, die mit dem Sicherheitselement-Schichtaufbau 26 fest verbunden ist und mit diesem ein stabiles Lackgitter 30 bildet.For this purpose, a stabilizing layer 28 in the form of a viscous UV lacquer layer is applied to the security element layer structure 26, which is firmly connected to the security element layer structure 26 and forms a stable lacquer grid 30 therewith.

Im Ausführungsbeispiel der Fig. 2 ist die Stabilisierungsschicht 28 gerade in Form des Negativs der gewünschten Motivform der Sicherheitselemente 12 aufgebracht, liegt also gerade in den Nicht-Übertragungsbereichen 42 vor, in denen beim Transfer kein Sicherheitselement-Schichtaufbau 26 auf das Banknotenpapier übertragen werden soll. In den Übertragungsbereichen 40, in denen der Sicherheitselement-Schichtaufbau 26 auf das Banknotenpapier übertragen werden soll, ist dagegen keine Stabilisierungsschicht 28 aufgebracht.In the embodiment of the Fig. 2 If the stabilizing layer 28 has just been applied in the form of the negative of the desired motif shape of the security elements 12, it is therefore precisely in the non-transfer areas 42 in which no security element layer structure 26 is to be transferred to the banknote paper during the transfer. In contrast, no stabilizing layer 28 is applied in the transmission areas 40 in which the security element layer structure 26 is to be transferred to the banknote paper.

Bei der Stabilisierungsschicht 28 handelt es sich im Ausführungsbeispiel um eine 6 µm dicke Schicht eines zähen UV-Lacks bestehend aus

  • 60 Gew-% aliphatischem Urethanacrylat,
  • 20 Gew-% TPGDA
  • 16 Gew-% multifunktionellem Reaktivverdünner und
  • 4 Gew-% Fotoinitiator.
In the exemplary embodiment, the stabilization layer 28 is a 6 μm thick layer of a tough UV lacquer consisting of
  • 60% by weight aliphatic urethane acrylate,
  • 20% by weight TPGDA
  • 16% by weight of multifunctional reactive thinner and
  • 4% by weight photo initiator.

Die Stabilisierungsschicht 28 weist eine hohe Bruchdehnung von 6,37% und eine große Bruchlast von 15,3 N/mm2 auf.The stabilization layer 28 has a high elongation at break of 6.37% and a large breaking load of 15.3 N / mm 2 .

Die Transferfolie 20 enthält weiter zwei Primerschichten 32, 34 mit einer Dicke von 1 µm bzw. 2 µm und eine 6 µm dicke Heißsiegelackschicht 36 zum Aufkleben des Sicherheitselement-Schichtaufbaus 26 auf das Zielsubstrat.The transfer film 20 further contains two primer layers 32, 34 with a thickness of 1 .mu.m or 2 .mu.m and a 6 .mu.m thick heat sealing lacquer layer 36 for adhering the security element layer structure 26 to the target substrate.

Zur Fertigstellung der Transferfolie 20 wird in einem Trennschritt das auf der Trägerfolie 22 aufgebrachte Lackgitter 30 in Form der motivförmigen Übertragungsbereiche 40 und der zusammenhängenden Nicht-Übertragungsbereiche 42 getrennt, beispielsweise durch Stanzen, insbesondere mit einer mechanischen Stanze oder einer Laserstanze. Die Stanzung erfolgt dabei zweckmäßig bis in die optionale Releaseschicht 24 hinein, um eine saubere Ablösung zu ermöglichen. Die Trennlinie kann bis in die temporäre Trägerfolie hinein reichen, insbesondere in eine erste Folienlage von zwei Folienlagen der temporären Trägerfolie hinein. Die beiden Folienlagen können aufeinander kaschiert sein. Die nicht angestanzte zweite Folienlage verhindert ein Reißen der temporären Trägerfolie, insbesondere bei weiteren Schritten, wie dem Entfernen (Ablösen) der Nicht-Übertragungsbereiche und/oder dem Übertragen der Übertragungsbereiche.To complete the transfer film 20, the lacquer grid 30 applied to the carrier film 22 is separated in the form of the motif-shaped transfer areas 40 and the contiguous non-transfer areas 42, for example by punching, in particular using a mechanical punch or a laser punch. The punching is expediently carried out into the optional release layer 24 in order to enable a clean detachment. The dividing line can extend into the temporary carrier film, in particular into a first film layer of two film layers of the temporary carrier film. The two layers of film can be laminated together. The non-punched second film layer prevents the temporary carrier film from tearing, in particular in further steps, such as removing (detaching) the non-transmission areas and / or transferring the transmission areas.

Die solchermaßen hergestellte Transferfolie 20 kann für eine spätere Weiterverarbeitung zwischengelagert oder sofort weiterverarbeitet werden.The transfer film 20 produced in this way can be temporarily stored for later processing or can be processed immediately.

Bei der Weiterverarbeitung wird dann vor einer Applikation der Sicherheitselemente 12 das Lackgitter 30 in den Nicht-Übertragungsbereichen 42 entfernt, so dass nur der in den Übertragungsbereichen 40 vorliegende Sicherheitselement-Schichtaufbau 26 auf der temporären Trägerfolie 22 verbleibt, wie in Fig. 3 illustriert. Diese Entfernung des Lackgitters 30 aus den Nicht-Übertragungsbereichen 42 wird durch die zähe Stabilisierungsschicht 28 ermöglicht, die dem Material der Nicht-Übertragungsbereiche 42 die notwendige Stabilität für den Ablösevorgang verleiht.During further processing, the lacquer grid 30 in the non-transfer areas 42 is then removed before application of the security elements 12, so that only the security element layer structure 26 present in the transfer areas 40 remains on the temporary carrier film 22, as in FIG Fig. 3 illustrated. This removal of the lacquer grid 30 from the non-transfer areas 42 is made possible by the tough stabilizing layer 28, which gives the material of the non-transfer areas 42 the necessary stability for the detachment process.

Figur 4 zeigt das Erscheinungsbild der Transferfolie 20 nach dem Entfernen des Lackgitters 30 in Aufsicht. In den Übertragungsbereichen 40 liegt der Sicherheitselement-Schichtaufbau 26 nun in der gewünschten Motivform vor, so dass die Sicherheitselemente 12 trotz einer vollflächigen Einwirkung von Heizwalze und Kalander motivförmig auf das Zielsubstrat übertragen werden können. Nach der Übertragung des Sicherheitselement-Schichtaufbaus 26 wird die temporäre Trägerfolie 22, gegebenenfalls mit Hilfe der nur optionalen Releaseschicht 24, abgelöst, so dass nur der dünne Sicherheitselement-Schichtaufbau 26 und die dünnen Primerschichten 32, 34 auf dem Zielsubstrat verbleiben. Figure 4 shows the appearance of the transfer film 20 after removal of the lacquer grid 30 in supervision. The security element layer structure 26 is now in the desired motif shape in the transfer areas 40, so that the security elements 12 can be motif-like transferred to the target substrate despite the full-surface action of the heating roller and calender. After the transfer of the security element layer structure 26, the temporary carrier film 22 is detached, possibly with the aid of the only optional release layer 24, so that only the thin security element layer structure 26 and the thin primer layers 32, 34 remain on the target substrate.

Eine Abwandlung der Transferfolie der Fig. 2 ist in Fig. 5 illustriert. Bei dieser Ausgestaltung liegt zwar die Stabilisierungsschicht 52 der Transferfolie 50 im Wesentlichen ebenfalls nur in den Nicht-Übertragungsbereichen 42 vor, im Unterschied zu dem Ausführungsbeispiel der Fig. 2 ist die Stabilisierungsschicht 52 allerdings mit einer in den Randbereichen 54 abnehmenden Schichtdicke ausgeführt, so dass sich Ausläufer 56 der Stabilisierungsschicht 52 einige Millimeter in die Übertragungsbereiche 40 hinein erstrecken.A modification of the transfer film of the Fig. 2 is in Fig. 5 illustrated. In this embodiment, the stabilization layer 52 of the transfer film 50 is essentially also only present in the non-transmission areas 42, in contrast to the exemplary embodiment in FIG Fig. 2 However, the stabilization layer 52 is designed with a decreasing layer thickness in the edge regions 54, so that extensions 56 of the stabilization layer 52 extend a few millimeters into the transmission regions 40.

Nach einer Stanzung in der in Fig. 5 illustrierten Form, und Entfernung des Lackgitters 30 aus den Nicht-Übertragungsbereichen 42 bilden die Ausläufer 56 in den stehengelassene Sicherheitselemente 12 seitliche Nasen aus Stabilisierungsschichtmaterial aus, die nach der Übertragung auf das Zielsubstrat Randverankerungselemente bilden, die eine Verankerung der Sicherheitselemente 12 auf dem Zielsubstrat unterstützen. Ebenso wie in Figur 2 oder 3 ist die Release-Schicht 24 nur optional vorhanden. Auch kann die Stanzung ebenso bis in die - gegebenenfalls doppellagige - temporäre Trägerschicht 22 hinein erfolgen.After a die cut in the Fig. 5 illustrated form, and removal of the lacquer grid 30 from the non-transmission areas 42, the extensions 56 form in the left security elements 12 side tabs made of stabilization layer material, which form edge anchoring elements after transfer to the target substrate, which support anchoring of the security elements 12 on the target substrate. Just like in Figure 2 or 3 release layer 24 is only optionally available. The punching can also be carried out into the — optionally double-layered — temporary carrier layer 22.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
Banknotebill
1212
Sicherheitselementsecurity element
2020
Transferfolietransfer film
2222
temporäre Trägerfolietemporary carrier film
2424
Releaseschichtrelease layer
2626
Sicherheitselement-SchichtaufbauSecurity-layer structure
2828
Stabilisierungsschichtstabilizing layer
3030
Lackgitterpaint grid
32, 3432, 34
Primerschichtenprimer layers
3636
HeißsiegelackschichtHeat sealing lacquer layer
4040
Übertragungsbereichetransmission areas
4242
Nicht-ÜbertragungsbereicheNon-transmission areas
5050
Transferfolietransfer film
5252
Stabilisierungsschichtstabilizing layer
5454
Randbereicheborder areas
5656
Ausläuferoffshoot

Claims (15)

  1. A transfer foi I for transferri ng motif-shaped security elements from transfer regions of the transfer foil to a target substrate, comprisi ng
    - a security-element layer structure (26) with a plurality of layers which, after transfer from the transfer regions, form the desired security elements on the target substrate,
    - a temporary carrier foil (22) for the production of the security-element layer structure (26), which is detachably connected to the security-element layer structure (26),
    - wherein a stabilizing layer (29) present at least in certain regions is firmly connected to the security-element layer structure (26),
    wherein the stabilizing layer (28) in the form of a viscous lacquer layer forms a stable lacquer grid (30) with the security-element layer structure (26),
    the stable lacquer grid (30), after a separation step for forming motif-shaped transfer regions (40) and non-transfer regions (42), is detachable from the temporary carrier foil (22) in the non-transfer regions (42), and
    the stabilizing layer (28) is present only in certain regions and substantially only in the non-transfer regions (42).
  2. The transfer foil according to claim 1, characterized in that the stable lacquer grid is present separately, in particular in punched manner, and forms mutually separated transfer regions (40) and non-transfer regions (42).
  3. The transfer foil according to claim 1 or 2, characterized in that the stabilizing layer (52) is height-structured and is advantageously formed with a layer thickness decreasing in the edge regions (54).
  4. The transfer foil according to at least claim 3, characterized in that, due to the decreasing layer thickness, extensions (56) of the stabilizing layer (52) project into the transfer regions (40).
  5. The transfer foil according to at least one of claims 1 to 4, characterized in that the non-transfer regions (42) are formed contiguously.
  6. The transfer foil accordi ng to at least one of claims 1 to 5, characterized in that the stabilizing layer (28) is arranged above the security-element layer structure (26) viewed from the temporary carrier foil (22).
  7. The transfer foil accordi ng to at least one of claims 1 to 6, characterized in that the stabilizing layer (28) has a layer thickness between 4
    Figure imgb0001
    m and 10
    Figure imgb0001
    m, preferably between 4
    Figure imgb0001
    m and 8
    Figure imgb0001
    m.
  8. The transfer foil accordi ng to at least one of claims 1 to 7, characterized in that the stabilizing layer (28) has a solids content of 90% or more, preferably that it is a 100% system.
  9. The transfer foil accordi ng to at least one of claims 1 to 8, characterized in that the stabilizing layer (28) is present in the form of a tough UV -curi ng or electron-beam-curing lacquer layer.
  10. The transfer foil accordi ng to at least one of claims 1 to 9, characterized in that the stabilizing layer (28) has an elongation at break of more than 2.5%, preferably more than 3%, particularly preferably more than 4% or even more than 5%.
  11. The transfer foil according to at least one of claims 1 to 10, characterized in that the stabilizing layer (28) has a breaking load of more than 15 N/mm
    Figure imgb0005
  12. The transfer foil according to at least one of claims 1 to 11, characterized in that the temporary carrier foil (22) has a first foil ply and a second foil ply, wherein a separation line between the transfer regions (40) and the non-transfer regions (42) preferably reaches into the fi rst foil ply.
  13. A method for transferri ng motif-shaped security elements to a target substrate, in which
    - a temporary carrier foil (22) is supplied,
    - a security-element layer structure (26) with a plurality of layers is produced on the temporary carrier foil (22),
    - at least in certain regions a stabilizing layer (28) in the form of a viscous lacquer layer is applied which is firmly connected to the security-element layer structure (26) and forms a stable lacquer grid (30) therewith,
    - in a separation step at least in the security-element layer structure (26) motif-shaped transfer regions (40) and non-transfer regions (42) are formed,
    wherein the stabilizing layer (28) is present only in certain regions and substantially only in the non-transfer regions (42),
    - the stable lacquer grid (30) with the security-element layer structure (26) is detached in the non-transfer regions (42) from the temporary carrier foil, and
    - the security-element layer structure (26) is transferred from the motif-shaped transfer regions (40) to the target substrate and the temporary carrier foil (22) is peeled off the security-element layer structure.
  14. The method according to claim 13, characterized in that the separation step is effected by punching, in particular mechanical punching or laser punching.
  15. The method according to either of claims 13 or 14, characterized in that in the separation step separation lines are produced which reach through the security-element layer structure (26) into the temporary carrier foil, preferably only up to a fi rst ply of the temporary carrier foil configured as at least a double-ply carrier foil.
EP17001297.5A 2016-08-02 2017-07-27 Method and transfer film for the transmission of motive shaped security elements on a target substrate Active EP3279005B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102016009318.8A DE102016009318A1 (en) 2016-08-02 2016-08-02 Method and transfer film for transferring motif-shaped security elements onto a target substrate

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EP3279005A1 EP3279005A1 (en) 2018-02-07
EP3279005B1 true EP3279005B1 (en) 2019-12-25

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DE (1) DE102016009318A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018001379A1 (en) 2018-02-21 2019-08-22 Giesecke+Devrient Currency Technology Gmbh transfer materials
DE102022000409A1 (en) 2022-02-03 2023-08-03 Giesecke+Devrient Currency Technology Gmbh Security element transfer material and method of making same
DE102022000747A1 (en) * 2022-03-02 2023-09-07 Giesecke+Devrient ePayments GmbH Process for producing a foil for a card-shaped data carrier, Foil and card-shaped data carrier

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CH678835A5 (en) * 1991-01-18 1991-11-15 Landis & Gyr Betriebs Ag
EP1700707B1 (en) * 2003-12-26 2010-04-07 Nhk Spring Co.Ltd. Identification medium and method for identifying identification medium
DE102008047641A1 (en) * 2008-09-17 2010-04-15 Giesecke & Devrient Gmbh Security element transfer material with multilayer support
DE102012220903B4 (en) * 2012-11-15 2023-06-07 Bundesdruckerei Gmbh Method for generating a security feature for a value and/or security product and value and/or security product (inkjet printing)
DE102013015689A1 (en) 2013-09-16 2015-03-19 Giesecke & Devrient Gmbh Strip-shaped endless foil and its use
DE102014112073A1 (en) * 2014-08-22 2016-02-25 Ovd Kinegram Ag Transfer film and method for producing a transfer film

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DE102016009318A1 (en) 2018-02-08

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