EP3179466B1 - Thermo-direct printable security label - Google Patents

Thermo-direct printable security label Download PDF

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Publication number
EP3179466B1
EP3179466B1 EP15003478.3A EP15003478A EP3179466B1 EP 3179466 B1 EP3179466 B1 EP 3179466B1 EP 15003478 A EP15003478 A EP 15003478A EP 3179466 B1 EP3179466 B1 EP 3179466B1
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EP
European Patent Office
Prior art keywords
layer
thermo
part element
joined
carrier substrate
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EP15003478.3A
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German (de)
French (fr)
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EP3179466A1 (en
Inventor
Georg Aigner
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Hueck Folien GmbH
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Hueck Folien GmbH
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Priority to EP15003478.3A priority Critical patent/EP3179466B1/en
Publication of EP3179466A1 publication Critical patent/EP3179466A1/en
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/02—Forms or constructions
    • G09F3/0291—Labels or tickets undergoing a change under particular conditions, e.g. heat, radiation, passage of time
    • G09F3/0292—Labels or tickets undergoing a change under particular conditions, e.g. heat, radiation, passage of time tamper indicating labels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/02—Forms or constructions
    • G09F2003/0208—Indicia
    • G09F2003/0211—Transfer or thermo-sensitive
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/02—Forms or constructions
    • G09F2003/0208—Indicia
    • G09F2003/0213—Concealed data

Definitions

  • the invention relates to a security tag, as well as a method for producing the security tag, wherein the security tag a security element, such as a diffractive optical active structure, combined with a reflective layer or an HRI layer in conjunction with an opaque black, colored or white layer, and a hidden having individual information.
  • a security element such as a diffractive optical active structure
  • the invention therefore provides a security tag with a hidden security feature consisting of 2 sub-elements, characterized in that a) the first sub-element is a carrier substrate with a direct thermal coating and b) the second sub-element is a substantially opaque element and has a diffractive optically active structure combined with a reflective metallic layer or an HRI layer connected to an opaque black, colored or white layer wherein the two sub-elements connected to each other and then the first sub-element is printed in a direct thermal process through the second sub-element therethrough.
  • the first subelement preferably has a first carrier substrate made of a paper.
  • This paper substrate consists of pulp-free or cellulose-containing paper, or of a composite of paper, for example with plastics, this paper substrate may have a basis weight of 20-500 g / m 2 , preferably 40-200 g / m 2 and on a surface with a Thermodirektbe harshung is provided.
  • first support substrate for the first subelement a plastic film or a metal foil provided on a surface with a direct thermal coating may be used.
  • an adhesive coating for fixing the label on the object to be secured is provided.
  • the second subelement represents a substantially opaque element.
  • This second sub-element is initially provided on a second carrier substrate of a flexible plastic film, wherein the second carrier substrate is removed after laminating the first sub-element with the second sub-element.
  • a radiation-curable or thermally curable lacquer layer is initially applied, into which a diffraction-optically active structure is subsequently introduced.
  • Applied to this diffraction-optically active structure is a full-surface or partial reflective metallic layer or an HRI layer in combination with an opaque black, colored or white layer, for example a black ink or a layer of a metal compound such as unstoichiometric alumina.
  • One of the two sub-elements is provided with a release layer.
  • the two sub-elements are laminated by means of an adhesive layer against each other, wherein subsequently the carrier substrate of the second sub-element is removed.
  • the security element is then printed subsequently or at a later time from the side of the second sub-element in the direct thermal process, wherein the pressure on the lying below the second sub-element first sub-element is recognizable on the direct thermal coating. However, the print initially remains hidden under the substantially opaque sub-element.
  • the printing is visible to the viewer.
  • carrier films are preferably flexible plastic films, for example of PI, PP, MOPP, PE, PPS, PEEK, PEK, PEI, PSU, PAEK, LCP, PEN, PBT, PET, PA, PC, COC, POM , ABS, PVC, PTFE, ETFE (ethylene tetrafluoroethylene), PFA (tetrafluoroethylene-perfluoropropyl vinyl ether fluorocopolymer), MFA (tetrafluoromethylene-perfluoropropyl vinyl ether fluorocopolymer), PTFE (polytetrafluoroethylene), PVF (polyvinyl fluoride), PVDF (polyvinylidene fluoride), and EFEP (ethylene oxide).
  • Tetrafluoroethylene-hexafluoropropylene fluoroterpolymer Tetrafluoroethylene-hexafluoropropylene fluoroterpolymer.
  • carrier substrates made of PET are used.
  • the carrier films preferably have a thickness of 5 to 700 .mu.m, preferably 5 to 200 .mu.m, particularly preferably 5 to 50 .mu.m.
  • a layer with diffractive optically active structures optionally combined with a reflective layer, applied.
  • diffraction-optically active structure is meant a diffraction, diffraction or relief structure.
  • these include diffraction structures, diffraction gratings, surface reliefs, holograms or kinegrams.
  • a layer of a radiation-curable lacquer can be applied to the carrier substrate.
  • the radiation-curable lacquer can be, for example, a radiation-curable lacquer system based on a polyester, an epoxy or polyurethane system which contains two or more different photoinitiators known to the person skilled in the art, which can initiate curing of the lacquer system to varying degrees at different wavelengths.
  • a photoinitiator at a wavelength of 200 to 400 nm and the second photoinitiator at a wavelength of 370 to 600 nm can be activated.
  • Sufficient difference should be maintained between the activation wavelengths of the two photoinitiators to prevent over-excitation of the second photoinitiator while the first photoinitiator is activated.
  • the region in which the second photoinitiator is excited should be in the transmission wavelength range of the carrier substrate used.
  • For the main curing (activation of the second photoinitiator) also electron radiation can be used.
  • a water-thinnable varnish can also be used. Preference is given to polyester-based paint systems.
  • the layer thickness of the applied radiation-curable lacquer may vary depending on the requirements of the end product and the thickness of the substrate generally between 0.5 and 50 ⁇ m, preferably between 2 and 10 ⁇ m, particularly preferably between 2 and 5 ⁇ m.
  • the impression of the diffraction-optically active structure takes place, for example, at a controlled temperature by means of a die or by using an embossing mold in the radiation-curable lacquer layer.
  • the lacquer layer was precured by activation of the first photoinitiator to the gel point and is at this stage at the time of the impression. If a water-dilutable radiation-curable lacquer is used, pre-drying may optionally be preceded, for example by IR emitters.
  • the curing of the structure is preferably carried out by UV radiation but can also physically after the composition of the layer, for example by heat.
  • a full-surface or partial reflective layer of a metal, or an alloy can be applied.
  • a metal layer layers of Al, Cu, Fe, Ag, Au, Cr, Ni, Zn, Pt, Pd, Ti and the like are suitable.
  • Suitable alloys are, for example, Cu-Al alloys, Cu-Zn alloys and the like.
  • the metallic layer is preferably applied by a PVD or CVD method.
  • the application may be by printing with a paint containing metallic pigments or a printing ink containing metallic pigments.
  • an HRI layer combined with an opaque black, colored or white layer, for example an opaque black printing layer or an opaque dark, colored or black metal compound layer, for example a layer of non-stoichiometric alumina, or an opaque white layer can be applied.
  • Opaque colored or white layers also include printing layers which have colored or white pigments.
  • an adhesive layer and then a release layer are applied to this layer sequence.
  • the release layer and / or the adhesive layer can also be applied to the first subelement.
  • Particularly suitable release layers are known, poorly adhering coating compositions, for example based on cycloolefin copolymers, nitrocellulose, acrylates, polyvinyl chloride, ethylene acrylate copolymers or styrene acrylates in a suitable solvent.
  • chlorinated polyolefins are added to adjust the release properties.
  • the proportion of the chlorinated polyolefins in the composition may be 1 to 50% by weight, preferably 1 to 25% by weight, more preferably 1 to 15% by weight, relative to the base polymer.
  • even very thinly applied polyamide, polyethylene, fluoropolymer wax layers or silicone coatings can be used as the release layer.
  • a first carrier substrate for the first sub-element is provided from a paper.
  • This paper substrate consists of pulp-free or cellulose-containing paper, or of a composite of paper, for example with plastics, this paper substrate may have a basis weight of 20-500 g / m 2 , preferably 40-200 g / m 2 and on a surface with a Thermodirektbe harshung is provided.
  • a plastic film or a metal foil provided on a surface with a direct thermal coating may be used as the first supporting substrate.
  • the plastic film may be the same or different than the carrier substrate of the second partial element.
  • metal foils for example, films of Al, Cu, Sn, Ni, Fe or stainless steel foils with a thickness of 5 to 200 .mu.m, preferably 10 to 80 .mu.m, particularly preferably 20 to 50 microns in question.
  • the first sub-element is then connected to the surface carrying the direct thermal coating with the second sub-element in such a way that the layer structures of the sub-elements are interconnected.
  • the paper substrate is provided on the surface opposite the direct thermal coating with an adhesive coating, in particular a self-adhesive coating or a cold-seal coating, with which the security label can be connected to an object to be secured.
  • an adhesive coating in particular a self-adhesive coating or a cold-seal coating, with which the security label can be connected to an object to be secured.
  • the label thus produced can then be printed in a direct thermal printing process from the side of the optically active layer or structure.
  • the printing can take place immediately after production of the label or at a later date.
  • the printing can be in the form of characters, letters, numbers, symbols, pictures, lines, guilloches, logos, patterns or even in the form of a barcode.
  • the printing may contain, for example, security-relevant information, such as, for example, coding, product-specific data, production data, batch identifications and the like.
  • the print In the presence of a full-surface reflective metallic layer or an opaque black, colored or white layer in conjunction with an HRI layer, the print will only be recognizable when manipulated or when the label is removed to ensure authenticity, with the label then separating along the release layer ,
  • the printing may be partially visible through the recesses in a partial layer, wherein the printing in a tampering attempt or when removing the label to check the authenticity, to complete information.
  • the label then separates along the release liner.
  • the security label according to the invention can be used on data carriers, on packaging material, for example in the pharmaceutical, electronics and / or Food industry, or to be used on other products and objects to be secured.
  • FIGS. 1 to 3 an embodiment of the security label according to the invention is shown.
  • This in Fig. 1 illustrated security label has a carrier substrate 1, which consists of a flexible plastic film.
  • An embossed lacquer layer 2 combined with a reflection layer 9 is applied to this carrier substrate 1.
  • a laminating adhesive layer 3 is applied to this layer sequence.
  • the carrier substrate thus prepared is coated against a layer structure consisting of a paper substrate 6 which is provided on a surface with a direct thermal coating 5 and a release layer 4 situated on this direct thermal coating 5.
  • the paper substrate is provided with a self-adhesive coating 7 on the surface opposite the thermal direct coating.
  • the carrier substrate 1 is then peeled off and the security label is printed from the surface of the lacquer layer 2 in the direct thermal process with information which appears in the direct thermal coating 5 as hidden information 8, as in FIG FIG. 2 shown.
  • the hidden information 8 is initially not recognizable from the outside due to the substantially opaque layer 9.
  • the label is then fixed on the object 10 to be secured.
  • Fig. 3 the security tag is shown after trying to release it from the object to be secured.
  • the upper part A of the label separates from the lower part B of the label in the region of the release layer, wherein the release layer may remain on the Kaschierklebe für or alternatively on the direct thermal coating, depending on the set adhesion ratios.
  • the hidden information 8 produced by thermal dot printing is visible.
  • the hidden information 8 can be in the form of characters, letters, numbers, symbols, images or even in the form of a barcode.
  • the security tag according to the invention can be used to secure articles, products, packaging, as a seal and the like.

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
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Description

Die Erfindung betrifft ein Sicherheitsetikett, sowie ein Verfahren zur Herstellung des Sicherheitsetiketts, wobei das Sicherheitsetikett ein Sicherheitselement, wie eine beugungsoptisch aktive Struktur, kombiniert mit einer Reflexionsschicht oder einer HRI-Schicht in Verbindung mit einer opaken schwarzen, farbigen oder weißen Schicht, und eine versteckte individuelle Information aufweist. Das Dokument US2012/149561A ist als nächstliegender Stand der Technik angesehen Aufgabe der Erfindung war es, ein Sicherheitsetikett bereitzustellen, das individuell mit einem weiteren Sicherheitsmerkmal versehen werden kann und das auf einfache Weise ausgelesen werden kann.The invention relates to a security tag, as well as a method for producing the security tag, wherein the security tag a security element, such as a diffractive optical active structure, combined with a reflective layer or an HRI layer in conjunction with an opaque black, colored or white layer, and a hidden having individual information. The document US2012 / 149561A The object of the invention was to provide a security label which can be individually provided with a further security feature and which can be read out in a simple manner.

Gegenstand der Erfindung ist daher ein Sicherheitsetikett mit einem versteckten Sicherheitsmerkmal, bestehend aus 2 Teilelementen, dadurch gekennzeichnet, dass
a) das erste Teilelement ein Trägersubstrat mit einer Thermodirektbeschichtung ist und b) das zweite Teilelement ein im Wesentlichen opakes Element ist und eine beugungsoptisch aktive Struktur kombiniert mit einer reflektierenden metallischen Schicht oder einer HRI-Schicht verbunden mit einer opaken schwarzen, farbigen oder weißen Schicht aufweist wobei die beiden Teilelemente miteinander verbunden und anschließend das erste Teilelement in einem Thermodirektverfahren durch das zweite Teilelement hindurch bedruckt wird.The invention therefore provides a security tag with a hidden security feature consisting of 2 sub-elements, characterized in that
a) the first sub-element is a carrier substrate with a direct thermal coating and b) the second sub-element is a substantially opaque element and has a diffractive optically active structure combined with a reflective metallic layer or an HRI layer connected to an opaque black, colored or white layer wherein the two sub-elements connected to each other and then the first sub-element is printed in a direct thermal process through the second sub-element therethrough.

Das erste Teilelement weist vorzugsweise ein erstes Trägersubstrat aus einem Papier auf. Dieses Papiersubstrat besteht aus zellstofffreiem oder zellstoffhaltigem Papier, oder aus einem Verbund aus Papier, beispielsweise mit Kunststoffen, wobei dieses Papiersubstrat ein Flächengewicht von 20 - 500 g/m2, vorzugsweise 40 - 200 g/m2 aufweisen kann und auf einer Oberfläche mit einer Thermodirektbeschichtung versehen ist.The first subelement preferably has a first carrier substrate made of a paper. This paper substrate consists of pulp-free or cellulose-containing paper, or of a composite of paper, for example with plastics, this paper substrate may have a basis weight of 20-500 g / m 2 , preferably 40-200 g / m 2 and on a surface with a Thermodirektbeschichtung is provided.

Alternativ kann als erstes Trägersubstrat für das erste Teilelement eine Kunststofffolie oder eine Metallfolie verwendet werden, die auf einer Oberfläche mit einer Thermodirektbeschichtung versehen ist.Alternatively, as the first support substrate for the first subelement, a plastic film or a metal foil provided on a surface with a direct thermal coating may be used.

Auf der der Thermodirektbeschichtung gegenüberliegenden Oberfläche des ersten Teilelements ist eine Klebebeschichtung zur Fixierung des Etiketts auf dem zu sichernden Gegenstand vorgesehen.On the opposite surface of the thermal direct coating of the first sub-element, an adhesive coating for fixing the label on the object to be secured is provided.

Das zweite Teilelement stellt ein im Wesentlichen opakes Element dar.
Dieses zweite Teilelement wird vorerst auf einem zweiten Trägersubstrat aus einer flexiblen Kunststofffolie bereitgestellt, wobei das zweite Trägersubstrat nach dem Kaschieren des ersten Teilelements mit dem zweiten Teilelement abgezogen wird.
Auf dieses zweite Trägersubstrat wird vorerst eine strahlungshärtbare oder thermisch härtbare Lackschicht aufgebracht, in die anschließend eine beugungsoptisch aktive Struktur eingebracht wird.
Auf diese beugungsoptisch aktive Struktur ist eine vollflächige oder partielle reflektierende metallische Schicht oder eine HRI-Schicht in Kombination mit einer opaken schwarzen, farbigen oder weißen Schicht, beispielsweise einer schwarze Druckfarbe oder eine Schicht aus einer Metallverbindung, wie beispielsweise unstöchiometrischem Aluminiumoxid aufgebracht.The second subelement represents a substantially opaque element.
This second sub-element is initially provided on a second carrier substrate of a flexible plastic film, wherein the second carrier substrate is removed after laminating the first sub-element with the second sub-element.
Onto this second carrier substrate, a radiation-curable or thermally curable lacquer layer is initially applied, into which a diffraction-optically active structure is subsequently introduced.
Applied to this diffraction-optically active structure is a full-surface or partial reflective metallic layer or an HRI layer in combination with an opaque black, colored or white layer, for example a black ink or a layer of a metal compound such as unstoichiometric alumina.

Eines der beiden Teilelemente ist mit einer Trennschicht versehen. Die beiden Teilelemente sind mittels einer Klebeschicht gegeneinander kaschiert, wobei anschließend das Trägersubstrat des zweiten Teilelements abgezogen wird.One of the two sub-elements is provided with a release layer. The two sub-elements are laminated by means of an adhesive layer against each other, wherein subsequently the carrier substrate of the second sub-element is removed.

Das Sicherheitselement wird dann anschließend oder zu einem späteren Zeitpunkt von der Seite des zweiten Teilelements im Thermodirektverfahren bedruckt, wobei der Druck auf dem unter dem zweiten Teilelement liegenden ersten Teilelement auf dessen Thermodirektbeschichtung erkennbar wird. Allerdings bleibt die Bedruckung vorerst unter dem im Wesentlichen opaken Teilelement verborgen.The security element is then printed subsequently or at a later time from the side of the second sub-element in the direct thermal process, wherein the pressure on the lying below the second sub-element first sub-element is recognizable on the direct thermal coating. However, the print initially remains hidden under the substantially opaque sub-element.

Erst nach der Trennung des zweiten Teilelements vom ersten Teilelement, beispielsweise bei einem Manipulationsversuch oder bei einer Trennung zur Authentifizierung des gesicherten Gegenstandes, entlang der Trennschicht wird die Bedruckung für den Betrachter sichtbar.Only after the separation of the second partial element from the first partial element, for example during a manipulation attempt or during a separation from Authentication of the secured object, along the separation layer, the printing is visible to the viewer.

Ein weiterer Gegenstand der Erfindung ist ein Verfahren zur Herstellung eines Sicherheitsetiketts mit einem versteckten Sicherheitsmerkmal, bestehend aus einem ersten und einem zweiten Teilelement, die miteinander verbunden werden, gekennzeichnet durch folgende Verfahrensschritte:

  1. A) Bereitstellen des zweiten Teilelements durch
    1. i) Bereitstellen eines zweiten Trägersubstrats aus einer flexiblen Kunststofffolie
    2. ii) Aufbringen einer strahlungshärtbaren oder thermisch härtbaren Lackschicht auf die flexible Kunststofffolie
    3. iii) Einbringen einer beugungsoptisch aktiven Struktur in die Lackschicht
    4. iv) ggf. Aushärten der strahlungshärtbaren Lackschicht,
    5. v) Aufbringen einer vollflächigen oder partiellen reflektierenden metallischen Schicht oder einer HRI- Schicht in Verbindung mit einer opaken schwarzen, farbigen oder weißen Schicht auf die Lackschicht,
  2. B) Bereitstellen des ersten Teilelements durch Bereitstellen eines auf einer Oberfläche mit einer Thermodirektbeschichtung versehenen ersten Trägersubstrats bestehend aus einem Papiersubstrats, einer Kunststofffolie oder einer Metallfolie, wodurch ein thermodirektbedruckbares Substrat entsteht,
  3. C) Aufbringen einer Trennschicht auf die mit der Thermodirektbeschichtung versehene Oberfläche des ersten Trägersubstrats des ersten Teilelements oder auf die vollflächige oder partielle reflektierende metallische Schicht oder die mit einer HRI-Schicht verbundene opake schwarze, farbige oder weiße Schicht, des zweiten Teilelements
  4. D) Aufbringen einer Klebeschicht auf die metallische Schicht oder auf die opake schwarze, farbige, oder weiße Schicht, die mit der HRI- Schicht verbunden ist, des ersten Teilelements oder auf die Thermodirektbeschichtung des zweiten Teilelements oder auf die Trennschicht eines der beiden Teilelemente
  5. E) Verbinden des ersten und zweiten Teilelements, in der Weise, dass die auf den jeweiligen Substraten aufgebrachten Schichten miteinander verbunden werden
  6. F) Abziehen des Trägersubstrats
  7. G) ggf. Aufbringen einer Klebebeschichtung auf die nicht mit der Thermodirektbeschichtung versehene Oberfläche des ersten Trägersubstrats
  8. H) Bedrucken der miteinander verbundenen Teilelemente mit einem Thermodirektdruckverfahren von der Seite der beugungsoptisch aktiven Struktur, wobei der Druck auf der Thermodirektbeschichtung unter der opaken schwarzen, farbigen oder weißen Schicht oder der reflektierenden metallischen Schicht erscheint.
Another object of the invention is a method for producing a security tag with a hidden security feature, consisting of a first and a second sub-element, which are interconnected, characterized by the following method steps:
  1. A) providing the second subelement
    1. i) providing a second carrier substrate of a flexible plastic film
    2. ii) applying a radiation-curable or thermally curable lacquer layer on the flexible plastic film
    3. iii) introducing a diffractive optical active structure into the lacquer layer
    4. iv) optionally hardening the radiation-curable lacquer layer,
    5. v) applying a full-surface or partial reflective metallic layer or an HRI layer in conjunction with an opaque black, colored or white layer on the lacquer layer,
  2. B) providing the first sub-element by providing a first carrier substrate provided on a surface with a direct thermal coating, consisting of a paper substrate, a plastic film or a metal foil, whereby a thermally directly printable substrate is formed,
  3. C) applying a release layer to the thermal direct-coated surface of the first support substrate of the first sub-element or to the full-surface or partial reflective metallic layer or the connected to an HRI layer opaque black, colored or white layer, the second sub-element
  4. D) applying an adhesive layer to the metallic layer or to the opaque black, colored, or white layer associated with the HRI layer, the first partial element or the direct thermal coating of the second partial element or the separating layer of one of the two partial elements
  5. E) connecting the first and second sub-element, in such a way that the layers applied to the respective substrates are joined together
  6. F) removing the carrier substrate
  7. G) optionally applying an adhesive coating to the surface of the first carrier substrate not provided with the direct thermal coating
  8. H) printing the interconnected sub-elements with a direct thermal printing process from the side of the diffractive-optically active structure, wherein the print on the direct thermal coating appears under the opaque black, colored or white layer or the reflective metallic layer.

Als Trägersubstrate für das zweite Teilelement kommen beispielsweise Trägerfolien vorzugsweise flexible Kunststofffolien, beispielsweise aus PI, PP, MOPP, PE, PPS, PEEK, PEK, PEI, PSU, PAEK, LCP, PEN, PBT, PET, PA, PC, COC, POM, ABS, PVC, PTFE, ETFE (Ethylentetrafluorethylen), PFA (Tetrafluorethylen-Perfluorpropylvinylether-Fluorcopolymer), MFA (Tetrafluormethylen-Perfluorpropylvinylether-Fluorcopolymer), PTFE (Polytetrafluorethylen), PVF (Polyvinylfluorid), PVDF (Polyvinylidenfluorid), und EFEP (Ethylen-Tetrafluorethylen-Hexafluorpropylen-Fluorterpolymer) in Frage. Bevorzugt werden Trägersubstrate aus PET verwendet.
Die Trägerfolien weisen vorzugsweise eine Dicke von 5 - 700 µm, bevorzugt 5 - 200 µm, besonders bevorzugt 5 - 50 µm auf.As carrier substrates for the second sub-element, for example, carrier films are preferably flexible plastic films, for example of PI, PP, MOPP, PE, PPS, PEEK, PEK, PEI, PSU, PAEK, LCP, PEN, PBT, PET, PA, PC, COC, POM , ABS, PVC, PTFE, ETFE (ethylene tetrafluoroethylene), PFA (tetrafluoroethylene-perfluoropropyl vinyl ether fluorocopolymer), MFA (tetrafluoromethylene-perfluoropropyl vinyl ether fluorocopolymer), PTFE (polytetrafluoroethylene), PVF (polyvinyl fluoride), PVDF (polyvinylidene fluoride), and EFEP (ethylene oxide). Tetrafluoroethylene-hexafluoropropylene fluoroterpolymer). Preferably, carrier substrates made of PET are used.
The carrier films preferably have a thickness of 5 to 700 .mu.m, preferably 5 to 200 .mu.m, particularly preferably 5 to 50 .mu.m.

Auf dieses zweite Trägersubstrat wird eine Schicht mit beugungsoptisch aktiven Strukturen, gegebenenfalls kombiniert mit einer reflektierenden Schicht, aufgebracht.On this second carrier substrate, a layer with diffractive optically active structures, optionally combined with a reflective layer, applied.

Unter beugungsoptisch aktiver Struktur wird eine Diffraktions-, Beugungs- oder Reliefstruktur verstanden. Insbesondere werden darunter Beugungsstrukturen, Beugungsgitter, Oberflächenreliefs, Hologramme oder Kinegramme verstanden.By diffraction-optically active structure is meant a diffraction, diffraction or relief structure. In particular, these include diffraction structures, diffraction gratings, surface reliefs, holograms or kinegrams.

Zur Herstellung der beugungsoptisch aktiven Schichten kann auf das Trägersubstrat eine Schicht aus einem strahlungshärtbaren Lack aufgebracht werden.To produce the diffraction-optically active layers, a layer of a radiation-curable lacquer can be applied to the carrier substrate.

Der strahlungshärtbare Lack kann beispielsweise ein strahlungshärtbares Lacksystem auf Basis eines Polyester-, eines Epoxy- oder Polyurethansystems sein, das zwei oder mehr verschiedene, dem Fachmann geläufige Photoinitiatoren enthält, die bei unterschiedlichen Wellenlängen eine Härtung des Lacksystems in unterschiedlichem Ausmaß initiieren können. So kann beispielsweise ein Photoinitiator bei einer Wellenlänge von 200 bis 400 nm und der zweite Photoinitiator bei einer Wellenlänge von 370 bis 600 nm aktivierbar sein. Zwischen den Aktivierungswellenlängen der beiden Photoinitiatoren sollte genügend Differenz eingehalten werden, damit nicht eine zu starke Anregung des zweiten Photoinitiators erfolgt, während der erste Photoinitiator aktiviert wird. Der Bereich, in dem der zweite Photoinitiator angeregt wird, sollte im Transmissionswellenlängenbereich des verwendeten Trägersubstrats liegen. Für die Haupthärtung (Aktivierung des zweiten Photoinitiators) kann auch Elektronenstrahlung verwendet werden.The radiation-curable lacquer can be, for example, a radiation-curable lacquer system based on a polyester, an epoxy or polyurethane system which contains two or more different photoinitiators known to the person skilled in the art, which can initiate curing of the lacquer system to varying degrees at different wavelengths. For example, a photoinitiator at a wavelength of 200 to 400 nm and the second photoinitiator at a wavelength of 370 to 600 nm can be activated. Sufficient difference should be maintained between the activation wavelengths of the two photoinitiators to prevent over-excitation of the second photoinitiator while the first photoinitiator is activated. The region in which the second photoinitiator is excited should be in the transmission wavelength range of the carrier substrate used. For the main curing (activation of the second photoinitiator) also electron radiation can be used.

Als strahlungshärtbarer Lack kann auch ein wasserverdünnbarer Lack verwendet werden. Bevorzugt werden Lacksysteme auf Polyesterbasis.As a radiation-curable varnish, a water-thinnable varnish can also be used. Preference is given to polyester-based paint systems.

Die Schichtdicke des aufgebrachten strahlungshärtbaren Lacks kann je nach Anforderung an das Endprodukt und Dicke des Substrats variieren und beträgt im Allgemeinen zwischen 0,5 und 50 µm, vorzugsweise zwischen 2 und 10 µm, besonders bevorzugt zwischen 2 und 5 µm.The layer thickness of the applied radiation-curable lacquer may vary depending on the requirements of the end product and the thickness of the substrate generally between 0.5 and 50 μm, preferably between 2 and 10 μm, particularly preferably between 2 and 5 μm.

Die Abformung der beugungsoptisch aktiven Struktur, also einer Diffraktions-, Beugungs- oder Reliefstruktur, erfolgt beispielsweise bei kontrollierter Temperatur mittels einer Matrize oder unter Verwendung einer Prägeform in die strahlungshärtbare Lackschicht. Die Lackschicht wurde durch Aktivierung des ersten Photoinitiators bis zum Gelpunkt vorgehärtet und befindet sich zum Zeitpunkt der Abformung in diesem Stadium.
Wird ein wasserverdünnbarer strahlungshärtbarer Lack verwendet, kann gegebenenfalls eine Vortrocknung vorgeschaltet werden, beispielsweise durch IR-Strahler.The impression of the diffraction-optically active structure, that is, a diffraction, diffraction or relief structure, takes place, for example, at a controlled temperature by means of a die or by using an embossing mold in the radiation-curable lacquer layer. The lacquer layer was precured by activation of the first photoinitiator to the gel point and is at this stage at the time of the impression.
If a water-dilutable radiation-curable lacquer is used, pre-drying may optionally be preceded, for example by IR emitters.

Die Aushärtung der Struktur erfolgt bevorzugt durch UV-Strahlung kann aber auch nach Zusammensetzung der Schicht physikalisch, beispielsweise durch Wärme erfolgen.The curing of the structure is preferably carried out by UV radiation but can also physically after the composition of the layer, for example by heat.

Anschließend kann eine vollflächige oder partielle reflektierende Schicht aus einem Metall, oder einer Legierung aufgebracht werden.
Als Metallschicht sind Schichten aus AI, Cu, Fe, Ag, Au, Cr, Ni, Zn, Pt, Pd, Ti und dergleichen geeignet. Geeignete Legierungen sind beispielsweise Cu-Al-Legierungen, Cu-Zn-Legierungen und dergleichen.Subsequently, a full-surface or partial reflective layer of a metal, or an alloy can be applied.
As the metal layer, layers of Al, Cu, Fe, Ag, Au, Cr, Ni, Zn, Pt, Pd, Ti and the like are suitable. Suitable alloys are, for example, Cu-Al alloys, Cu-Zn alloys and the like.

Die metallische Schicht wird vorzugsweise durch ein PVD- oder CVD- Verfahrens aufgebracht. Alternativ kann die Aufbringung durch Drucken mit einem Metallpigmente enthaltenden Lacks oder einer Druckfarbe, die metallische Pigmente enthält, erfolgen.The metallic layer is preferably applied by a PVD or CVD method. Alternatively, the application may be by printing with a paint containing metallic pigments or a printing ink containing metallic pigments.

In einer weiteren Ausführungsform kann anstelle der reflektierenden Schicht eine HRI-Schicht kombiniert mit einer opaken schwarzen, farbigen oder weißen Schicht, beispielsweise einer opaken schwarzen Druckschicht oder einer opaken dunklen, farbigen oder schwarzen Metallverbindungsschicht, beispielsweise einer Schicht aus nichtstöchiometrischem Aluminiumoxid, oder einer opaken weißen Schicht aufgebracht werden. Als opake farbige oder weiße Schichten kommen auch Druckschichten, die farbige oder weiße Pigmente aufweisen in Frage.In a further embodiment, instead of the reflective layer, an HRI layer combined with an opaque black, colored or white layer, for example an opaque black printing layer or an opaque dark, colored or black metal compound layer, for example a layer of non-stoichiometric alumina, or an opaque white layer can be applied. Opaque colored or white layers also include printing layers which have colored or white pigments.

Auf diese Schichtenfolge wird eine Klebeschicht und anschließend eine Trennschicht aufgebracht. Die Trennschicht und/oder die Klebeschicht können alternativ auch auf das erste Teilelement aufgebracht werden.An adhesive layer and then a release layer are applied to this layer sequence. Alternatively, the release layer and / or the adhesive layer can also be applied to the first subelement.

Als Trennschicht kommen insbesondere bekannte, schlecht haftende Lackzusammensetzungen, beispielsweise auf Basis von Cycloolefincopolymeren, Nitrocellulose, Acrylaten, Polyvinylchlorid, Ethylenacrylatcopolymeren oder Styrolacrylaten in einem geeigneten Lösungsmittel in Frage. Zur Einstellung der Trenneigenschaften werden dabei vorzugsweise chlorierte Polyolefine zugesetzt. Der Anteil der chlorierten Polyolefine in der Zusammensetzung kann 1 - 50 Gew%, vorzugsweise 1 - 25 Gew%, besonders bevorzugt 1 bis 15 Gew% im Verhältnis zum Basispolymer betragen.
Ferner können auch sehr dünn aufgetragene Polyamid-, Polyethylen-, Fluorpolymerwachsschichten oder Silikonbeschichtungen als Trennschicht verwendet werden.Particularly suitable release layers are known, poorly adhering coating compositions, for example based on cycloolefin copolymers, nitrocellulose, acrylates, polyvinyl chloride, ethylene acrylate copolymers or styrene acrylates in a suitable solvent. To adjust the release properties, preferably chlorinated polyolefins are added. The proportion of the chlorinated polyolefins in the composition may be 1 to 50% by weight, preferably 1 to 25% by weight, more preferably 1 to 15% by weight, relative to the base polymer.
Furthermore, even very thinly applied polyamide, polyethylene, fluoropolymer wax layers or silicone coatings can be used as the release layer.

Anschließend wird ein erstes Trägersubstrat für das erste Teilelement aus einem Papier bereitgestellt. Dieses Papiersubstrat besteht aus zellstofffreiem oder zellstoffhaltigem Papier, oder aus einem Verbund aus Papier, beispielsweise mit Kunststoffen, wobei dieses Papiersubstrat ein Flächengewicht von 20 - 500 g/m2, vorzugsweise 40 - 200 g/m2 aufweisen kann und auf einer Oberfläche mit einer Thermodirektbeschichtung versehen ist.Subsequently, a first carrier substrate for the first sub-element is provided from a paper. This paper substrate consists of pulp-free or cellulose-containing paper, or of a composite of paper, for example with plastics, this paper substrate may have a basis weight of 20-500 g / m 2 , preferably 40-200 g / m 2 and on a surface with a Thermodirektbeschichtung is provided.

Alternativ kann als erstes Trägersubstrat eine Kunststofffolie oder eine Metallfolie verwendet werden, die auf einer Oberfläche mit einer Thermodirektbeschichtung versehen ist.
Die Kunststofffolie kann gleich oder verschieden dem Trägersubstrat des zweiten Teilelements sein.
Als Metallfolien kommen beispielsweise Folien aus AI-, Cu-, Sn-, Ni-, Fe- oder Edelstahlfolien mit einer Dicke von 5 - 200 µm, vorzugsweise 10 bis 80 µm, besonders bevorzugt 20 - 50 µm in Frage.Alternatively, as the first supporting substrate, a plastic film or a metal foil provided on a surface with a direct thermal coating may be used.
The plastic film may be the same or different than the carrier substrate of the second partial element.
As metal foils, for example, films of Al, Cu, Sn, Ni, Fe or stainless steel foils with a thickness of 5 to 200 .mu.m, preferably 10 to 80 .mu.m, particularly preferably 20 to 50 microns in question.

Als Thermodirektbeschichtung kommen handelsübliche Beschichtungen in Frage. Es kann aber auch handelsübliches mit einer Thermodirektbeschichtung versehenes Papier verwendet werden.As a direct thermal coating commercially available coatings come into question. However, it is also possible to use commercial paper provided with a direct thermal coating.

Das erste Teilelement wird nun mit der die Thermodirektbeschichtung tragenden Oberfläche mit dem zweiten Teilelement verbunden und zwar in der Weise, dass die Schichtaufbauten der Teilelemente miteinander verbunden sind.The first sub-element is then connected to the surface carrying the direct thermal coating with the second sub-element in such a way that the layer structures of the sub-elements are interconnected.

Anschließend wird das Trägersubstrat auf dem das zweite Teilelement bereitgestellt wurde, abgezogen.Subsequently, the carrier substrate on which the second sub-element has been provided is removed.

Das Papiersubstrat wird auf der, der Thermodirektbeschichtung gegenüber liegenden, Oberfläche mit einer Klebebeschichtung, insbesondere einer Selbstklebebeschichtung oder einer Kaltsiegelbeschichtung versehen, mit der das Sicherheitsetikett mit einem zu sichernden Gegenstand verbunden werden kann.The paper substrate is provided on the surface opposite the direct thermal coating with an adhesive coating, in particular a self-adhesive coating or a cold-seal coating, with which the security label can be connected to an object to be secured.

Das so hergestellte Etikett kann anschließend in einem Thermodirektdruckverfahren von der Seite der optisch aktiven Schicht bzw. Struktur bedruckt werden.
Dabei kann die Bedruckung sofort nach Herstellung des Etiketts oder aber auch zu einem späteren Zeitpunkt erfolgen.The label thus produced can then be printed in a direct thermal printing process from the side of the optically active layer or structure.
The printing can take place immediately after production of the label or at a later date.

Dadurch ist es möglich die Bedruckung jeweils an die gewünschten Erfordernisse anzupassen und auch kundenspezifisch zu gestalten.This makes it possible to customize the printing in each case to the desired requirements and also to customize.

Die Bedruckung kann in Form von Zeichen, Buchstaben, Zahlen, Symbolen Bildern, Linien, Guillochen, Logos, Mustern oder auch in Form eines Barcodes vorliegen.The printing can be in the form of characters, letters, numbers, symbols, pictures, lines, guilloches, logos, patterns or even in the form of a barcode.

Die Bedruckung kann beispielsweise sicherheitsrelevante Informationen, wie beispielsweise eine Codierung, produktspezifische Daten, Herstellungsdaten, Chargenkennzeichnungen und dergleichen enthalten.The printing may contain, for example, security-relevant information, such as, for example, coding, product-specific data, production data, batch identifications and the like.

Dabei erscheint die Bedruckung auf der nun innerhalb des Etiketts verborgenen Thermodirektbeschichtung.The print appears on the now directly inside the label hidden direct thermal coating.

Bei Vorliegen einer vollflächigen reflektierenden metallischen Schicht oder einer opaken schwarzen, farbigen oder weißen Schicht in Verbindung mit einer HRI-Schicht wird die Bedruckung erst bei einer Manipulation oder bei Abziehen des Etiketts zur Sicherstellung der Authentizität erkennbar, wobei sich das Etikett dann entlang der Trennschicht trennt.In the presence of a full-surface reflective metallic layer or an opaque black, colored or white layer in conjunction with an HRI layer, the print will only be recognizable when manipulated or when the label is removed to ensure authenticity, with the label then separating along the release layer ,

Für den Fall, dass die reflektierende metallische Schicht oder opake schwarze, farbige oder weiße Schicht in Verbindung mit einer HRI-Schicht partiell vorgesehen ist, kann die Bedruckung teilweise durch die Aussparungen in einer partiellen Schicht erkennbar sein, wobei sich die Bedruckung bei einem Manipulationsversuch oder beim Abziehen des Etiketts zur Prüfung der Authentizität, zu einer vollständigen Information ergänzen kann. Das Etikett trennt sich dann entlang der Trennschicht.In the event that the reflective metallic layer or opaque black, colored or white layer is partially provided in conjunction with an HRI layer, the printing may be partially visible through the recesses in a partial layer, wherein the printing in a tampering attempt or when removing the label to check the authenticity, to complete information. The label then separates along the release liner.

Das erfindungsgemäße Sicherheitsetikett kann auf Datenträgern, auf Verpackungsmaterial beispielsweise in der Pharma-, der Elektronik- und/oder Lebensmittelindustrie, oder auf anderen zu sichernden Produkten und Gegenständen verwendet werden.The security label according to the invention can be used on data carriers, on packaging material, for example in the pharmaceutical, electronics and / or Food industry, or to be used on other products and objects to be secured.

In den Figuren 1 bis 3 ist eine Ausführungsform des erfindungsgemäßen Sicherheitsetiketts dargestellt.In the FIGS. 1 to 3 an embodiment of the security label according to the invention is shown.

Darin bedeuten

1
ein Trägersubstrat
2
eine mit einer Prägung versehene Lackschicht
3
eine Kaschierkleberschicht
4
eine Trennschicht
5
eine Thermodirektbeschichtung
6
ein Papiersubstrat
7
eine Selbstklebebeschichtung
8
eine versteckte Information
9
eine Reflexionsschicht
10
den zu sichernden Gegenstand.
Mean in it
1
a carrier substrate
2
a provided with an embossed lacquer layer
3
a laminating adhesive layer
4
a separation layer
5
a direct thermal coating
6
a paper substrate
7
a self-adhesive coating
8th
a hidden information
9
a reflection layer
10
the object to be secured.

Das in Fig. 1 dargestellte Sicherheitsetikett weist ein Trägersubstrat 1 auf, das aus einer flexiblen Kunststofffolie besteht. Auf dieses Trägersubstrat 1 ist eine geprägte Lackschicht 2 kombiniert mit einer Reflexionsschicht 9 aufgebracht. Anschließend ist auf diese Schichtenfolge eine Kaschierklebeschicht 3 aufgebracht.
Mit Hilfe dieser Kaschierklebeschicht 3 ist das so vorbereitete Trägersubstrat gegen einen Schichtaufbau bestehend aus einem Papiersubstrat 6, das an einer Oberfläche mit einer Thermodirektbeschichtung 5 und einer auf dieser Thermodirektbeschichtung 5 situierten Trennschicht 4 versehen ist, kaschiert. Das Papiersubstrat ist auf der, der Thermodirektbeschichtung gegenüber liegenden, Oberfläche mit einer Selbstklebebeschichtung 7 versehen.This in Fig. 1 illustrated security label has a carrier substrate 1, which consists of a flexible plastic film. An embossed lacquer layer 2 combined with a reflection layer 9 is applied to this carrier substrate 1. Subsequently, a laminating adhesive layer 3 is applied to this layer sequence.
With the aid of this laminating adhesive layer 3, the carrier substrate thus prepared is coated against a layer structure consisting of a paper substrate 6 which is provided on a surface with a direct thermal coating 5 and a release layer 4 situated on this direct thermal coating 5. The paper substrate is provided with a self-adhesive coating 7 on the surface opposite the thermal direct coating.

Das Trägersubstrat 1 wird nun abgezogen und das Sicherheitsetikett von der Oberfläche der Lackschicht 2 im Thermodirektverfahren mit einer Information bedruckt, die in der Thermodirektbeschichtung 5 als versteckte Information 8 erscheint, wie in Figur 2 dargestellt.
Die versteckte Information 8 ist vorerst aufgrund der im Wesentlichen lichtundurchlässigen Schicht 9 von außen nicht erkennbar.The carrier substrate 1 is then peeled off and the security label is printed from the surface of the lacquer layer 2 in the direct thermal process with information which appears in the direct thermal coating 5 as hidden information 8, as in FIG FIG. 2 shown.
The hidden information 8 is initially not recognizable from the outside due to the substantially opaque layer 9.

Mit Hilfe einer Selbstklebebeschichtung 7 wird das Etikett anschließend auf dem zu sichernden Gegenstand 10 fixiert.With the help of a self-adhesive coating 7, the label is then fixed on the object 10 to be secured.

In Fig. 3 ist das Sicherheitsetikett nach dem Versuch es vom zu sichernden Gegenstand zu lösen dargestellt. Dabei trennt sich der obere Teil A des Etiketts vom unteren Teil B des Etiketts im Bereich der Trennschicht, wobei die Trennschicht je nach eingestellten Haftungsverhältnissen auf der Kaschierklebeschicht oder alternativ auf der Thermodirektbeschichtung verbleiben kann.
Bei der Trennung wird die durch Thermodikrektdrucken erzeugte versteckte Information 8 sichtbar.
Die versteckte Information 8 kann in Form von Zeichen, Buchstaben, Zahlen, Symbolen, Bildern oder auch in Form eines Barcodes vorliegen.In Fig. 3 the security tag is shown after trying to release it from the object to be secured. In this case, the upper part A of the label separates from the lower part B of the label in the region of the release layer, wherein the release layer may remain on the Kaschierklebeschicht or alternatively on the direct thermal coating, depending on the set adhesion ratios.
During the separation, the hidden information 8 produced by thermal dot printing is visible.
The hidden information 8 can be in the form of characters, letters, numbers, symbols, images or even in the form of a barcode.

Das erfindungsgemäße Sicherheitsetikett kann zur Sicherung von Gegenständen, Produkten, Verpackungen, als Siegel und dergleichen verwendet werden.The security tag according to the invention can be used to secure articles, products, packaging, as a seal and the like.

Claims (8)

  1. Security label having a hidden security feature, comprising two part elements, characterized in that
    a) the first part element has a carrier substrate with a thermo-direct coating, and
    b) the second part element is a substantially opaque element and has a diffractive optically active structure combined with a reflective metallic layer or an HRI layer joined to an opaque black, coloured or white layer,
    wherein the two part elements are joined to each other and then the first part element is printed through the second part element in a thermo-direct process.
  2. Security label according to Claim 1, characterized in that the first part element has a first carrier substrate made of paper or a flexible plastic film or metal foil, which is provided with a thermo-direct coating on one surface.
  3. Security label according to either of Claims 1 and 2, characterized in that the diffractive optically active structure constitutes a diffraction structure or relief structure, such as a hologram.
  4. Security label according to one of Claims 1 to 3, characterized in that the first or the second part element is provided with a release coating.
  5. Security label according to one of Claims 1 to 4, characterized in that the two part elements are joined to each other by means of an adhesive layer in such a way that the reflective metallic layer or the opaque black, coloured or white layer which is joined to the HRI layer of the second part element faces the thermo-direct coating of the first part element.
  6. Security label according to one of Claims 1 to 5, characterized in that the first part element is provided with a self-adhesive coating on the surface opposite the thermo-direct coating.
  7. Method for producing a security label having a hidden security feature, characterized by the following method steps:
    A) providing the second part element by
    i) providing a second carrier substrate made of a flexible plastic film,
    ii) applying a radiation-curable or thermally curable varnish layer to the flexible plastic film,
    iii) introducing a diffractive optically active structure into the varnish layer,
    iv) if appropriate, curing the radiation-curable varnish layer,
    v) applying a full-surface or partial reflective metallic layer or an HRI layer joined to an opaque black, coloured or white layer to the varnish layer,
    B) providing the first part element by providing a first carrier substrate which consists of a paper substrate, a plastic film or a metallic foil and which is provided with a thermo-direct coating on one surface, which produces a thermo-direct printable substrate,
    C) applying a release layer to the surface of the first carrier substrate of the first part element that is provided with the thermo-direct coating or to the full-surface or partial reflective metallic layer or the opaque coloured, white or black layer joined to an HRI layer of the second part element,
    D) applying an adhesive layer to the metallic layer or to the coloured, white or black layer which is joined to the HRI layer of the first part element or to the thermo-direct coating of the first part element or to the release layer of one of the two part elements,
    E) joining the first and second part element in such a way that the layers applied to the respective substrates are joined to each other,
    F) pulling off the carrier substrate,
    G) if appropriate, applying an adhesive coating to the surface of the first carrier substrate that is not provided with the thermo-direct coating,
    H) printing the part elements joined to each other by a thermo-direct printing process from the side of the diffractive optically active structure, wherein the print on the thermo-direct coating appears under the opaque black, coloured or white layer or the reflective metallic layer.
  8. Use of the security label according to one of Claims 1 to 6 for securing objects, products, packages or as a seal.
EP15003478.3A 2015-12-07 2015-12-07 Thermo-direct printable security label Active EP3179466B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Publication number Priority date Publication date Assignee Title
EP3733749A1 (en) * 2019-05-02 2020-11-04 Hueck Folien Gesellschaft m.b.H. Metallized film

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Publication number Priority date Publication date Assignee Title
US6543808B1 (en) * 2001-07-05 2003-04-08 Translucent Technologies, Llc Direct thermal printable pull tabs
US20030207066A1 (en) * 2002-05-03 2003-11-06 Green Bay Packaging, Inc. Thermally printed ticket structure
JP4372474B2 (en) * 2003-08-26 2009-11-25 大日本印刷株式会社 Thermal printing sheet and method for producing the same
DE102004021897A1 (en) * 2004-05-04 2005-12-08 BTAS Brand protection Technologies & Authentification Systems GmbH Scratching label for e.g. lottery, has section on which covered information is placed after applying scratching layer, where label is prefabricated as semi-finished product, and section experiences color change by placement of information
US8546301B2 (en) * 2010-06-11 2013-10-01 Ws Packaging Group, Inc. On-demand printable construct

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