EP3279006A1 - Method for producing a safety element - Google Patents
Method for producing a safety element Download PDFInfo
- Publication number
- EP3279006A1 EP3279006A1 EP17001245.4A EP17001245A EP3279006A1 EP 3279006 A1 EP3279006 A1 EP 3279006A1 EP 17001245 A EP17001245 A EP 17001245A EP 3279006 A1 EP3279006 A1 EP 3279006A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- substrate
- watermark
- layer
- reflector layer
- radiation
- 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.)
- Withdrawn
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Classifications
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- 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
- B42D25/41—Marking using electromagnetic radiation
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- 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
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- 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
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- 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
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- 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
- B42D25/333—Watermarks
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- 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
- B42D25/351—Translucent or partly translucent parts, e.g. windows
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
- B42D25/373—Metallic materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
- B42D25/378—Special inks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/40—Manufacture
- B42D25/405—Marking
- B42D25/425—Marking by deformation, e.g. embossing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/40—Manufacture
- B42D25/405—Marking
- B42D25/43—Marking by removal of material
- B42D25/435—Marking by removal of material using electromagnetic radiation, e.g. laser
Definitions
- the invention relates to a method for producing a security element, wherein a substrate is provided which is translucent at least for certain radiation and has a watermark which modulates the opacity of the substrate.
- watermarks are known. They are usually introduced in the production of the substrate from which the security element is made, usually a paper. Watermarks are easily recognizable when the security element is viewed through transmitted light, since they modify the opacity of the substrate. As a rule, in the production of the paper, the thickness of the substrate is varied, so that a local reduction in thickness leads to a local reduction in opacity.
- watermark colors which also locally modify the opacity of the substrate.
- Watermarks are formed in the substrate in the production of the security material starting material, for example in the manufacture of banknote paper. Due to variations in the cutting process of a paper substrate, paper sheets usually have variations in the position of the watermark, which are in the millimeter range. Therefore, it is difficult to arrange other security features in an exact location to the watermark, so to pass.
- a watermark can be used as a mask for laser radiation to pattern a layer printed on the watermark.
- a laser-ablatable print layer can be arranged above the watermark, and the opacity variation, which has the watermark, serves to remove the print layer in a structured manner in the exact register to the watermark.
- this procedure is limited to print layers which, in addition, have a contrast characteristic identical to the watermark after removal.
- Holograms are known for securing items or documents from counterfeiting. They are particularly hard to fake.
- the invention has for its object to provide a method by which a security element is generated in which a hologram image in the register is a watermark.
- a substrate is provided which is translucent at least for certain radiation and a watermark which modulates the opacity of the substrate, wherein on one side of the substrate an embossing layer is applied, which at least partially covers the watermark, a holgram structure is embossed into the embossing layer and a reflector layer is applied to the hologram structure, and the substrate from the opposite side is irradiated with the particular radiation, wherein an intensity of the radiation is adjusted so that the watermark acts by means of the opacity modulation effected by him as a mask and the reflector layer is removed by the radiation in the register to the watermark structured.
- the invention is based on the concept of WO 2013/0124059 A1 on, which can generate a printing element in the register to a watermark.
- the reflector layer which is located on a stamped embossed layer with a hologram, is now structured.
- the reflector layer remains only in dark areas of the watermark, and the remaining hologram stands in perfect register with the watermark, since a reflective hologram is only visible in the non-ablated areas of the reflector layer.
- the hologram is effective only in the areas as a reflective hologram in which the reflector layer has not been removed.
- holographic structures which are still slightly visible can be suppressed by the optional application of a protective lacquer to the regions of the hologram structure exposed by the removal of the reflector layer.
- a protective lacquer to the regions of the hologram structure exposed by the removal of the reflector layer.
- the watermark may be a so-called "true watermark” if the substrate is a paper substrate.
- the watermark is then formed by depressions on a screen side of the substrate and modulates the thickness of the substrate. It is then preferred to apply the embossing layer and the reflector layer on the opposite felt side of the substrate, since this is flat.
- a watermark that modulates the opacity of a substrate can also be generated by a so-called watermark color, rather than by varying the thickness of the substrate.
- the watermark color causes a reduction of the scattering of light in the substrate core. Basically, scattering is due to a large number of interfaces of fibers, organic and inorganic fillers, glue, etc. to the surrounding air.
- Suitable binder components in the watermark ink are significantly reduced by suitable binder components in the watermark ink, thus decreasing opacity in these areas.
- a binder component is, for example, glycerol, which penetrates into the substrate and remains in the pores of the substrate. The same applies analogously if the watermark is caused by a coloration which modulates the opacity of the substrate.
- substrate erosions and / or substrate recesses by, for example, laser technology, grinding and / or punching, optionally in combination with a paper-made watermark and / or a watermark color.
- the hologram can be combined with a Stahltikverlessness.
- a steel print embossment passes through the entire substrate and leads to a tactile perceptible structure that is comparatively coarser than the hologram structure.
- the reflector layer can be provided with further pigments or dyes to produce additional register-containing effects.
- the embossing layer can be a UV-curable embossing lacquer or a thermoplastic lacquer.
- the embossing layer or the reflector layer can be provided with laser-sensitive dyes, so that the hologram, which is produced by the hologram structure, complement an additional color motif by the laser-sensitive dyes which were modified during the ablation and the watermark in register.
- hologram structure is generally understood to mean a diffractive structure, in particular a diffractive structure, which makes a hologram recognizable. But there are also other diffractive effects possible.
- the term "certain radiation” as used in this description therefore expresses that it can remove the reflector layer.
- the ablation is achieved when the particular radiation has an intensity suitable for ablation at the exit on the side of the reflector layer.
- the opacity modulation caused by the watermark reduces the intensity of the radiation on the side on which the reflector layer is located.
- the irradiated radiation intensity is therefore adjusted so that the opacity modulation, which is caused by the watermark, results in a radiation modulation which modulates the ablation effect.
- the watermark serves as a mask in the irradiation of the substrate with the specific radiation.
- Items to be protected within the scope of this description may include, for example, security papers, identity and value documents (such as banknotes, chip cards, passports, cards, identification cards, identity cards, stocks, bonds, certificates, vouchers, checks, tickets, credit cards, health cards,. ..) as well as product security elements, such as Labels, seals, packaging, be.
- identity and value documents such as banknotes, chip cards, passports, cards, identification cards, identity cards, stocks, bonds, certificates, vouchers, checks, tickets, credit cards, health cards,. ..
- product security elements such as Labels, seals, packaging, be.
- security paper is understood here in particular as the precursor that can not yet be processed to form a value document (eg a card) which, in addition to the pressure produced according to the invention, can also have further authenticity features (such as luminescent substances provided in the volume, for example).
- value documents here on the one hand from security papers produced documents, eg. B. banknotes understood.
- value documents can also be other documents and articles which are processed with the printing method according to the invention, so that the value documents have non-copyable authenticity features, whereby an authenticity check is possible and at the same time unwanted copies are prevented.
- the substrate is particularly preferably made of paper made of cotton fibers, or substantially of the natural polymer-cellulose, as it is used for example for banknotes.
- the substrate may also be made of paper of other natural fibers, also preferably of synthetic fibers, ie a mixture of natural and synthetic fibers consist. More preferably, the substrate consists of a combination of at least two superimposed and interconnected different substrates, a so-called hybrid. It may be, for example, a combination of plastic film paper or even a three-layer composite, such as plastic film paper plastic film, ie a paper substrate is covered on either side by a plastic film, or paper plastic film paper, ie Substrate made of a plastic film is covered on each side by a paper substrate.
- the substrate consists of an at least partially transparent plastic film.
- the watermark is generated in this case by a color which is applied to one side of the substrate and whose hue is at least similar to the hue of the substrate.
- a watermark is for example off DE 10 2009 056 462 A1 known.
- Plastic films may include, for example, polypropylene, polyethylene, polyethylene terephthalate, and polyamide.
- the reciprocal property of translucency is opacity. As far as there is talk here that a watermark modulates the opacity, it can equally be said that it inversely modulates the translucency.
- Fig. 1 shows a sectional view through a security element 1, which is constructed on a substrate 2 produced in the paper-based embodiment.
- the security element 1 has a watermark 3, which modulates the thickness of the substrate 2 and thus its opacity.
- the watermark is formed by the fact that 2 recesses 4 were incorporated in the top 5 of the substrate 2 in the manufacture of the substrate.
- Wells are examples of forming regions of reduced pulp (and reduced opacity). They can also be formed on the bottom. Due to the production of the watermark 3, the top 5 is also referred to as the screen side; the opposite bottom 6 as a felt side.
- a stamping layer 7 is applied, on which a reflector layer 8, z. As a metallization is located.
- a hologram structure 9 is embossed before the application of the reflector layer 8, which, together with the reflector layer 8, produces an effective reflection Hologram when viewed on the top 5 makes recognizable.
- the reflector layer 8 is first applied flat, ie without initial structuring. Structuring takes place by irradiating laser radiation 10 from the upper side 5, the intensity of which is adjusted such that it removes the reflector layer 8 from the embossing layer 7 after passing through the substrate 2 in the regions of the depressions 4.
- the intensity of the laser radiation 10 is so far attenuated that no ablation of the reflector layer 8 takes place more.
- the intensity of the laser radiation 10 is set exactly so that when passing through the substrate 2 in a non-reduced thickness just no removal of the reflector layer 8 more, with a reduced thickness due to the wells 4, however, a removal is achieved. In this way, the watermark 3 modulates the removal of the reflector layer 8.
- the laser beam 10 is guided over the substrate 2. It passes through the substrate 2.
- the wavelength of the laser beam is such that the reflector layer 8 absorbs the radiation.
- the laser beam 10 is attenuated depending on the opacity of the substrate 2, which is modulated by the watermark 3. At a point where the substrate has high opacity by the watermark, the laser beam 10 is greatly attenuated. At a location where the substrate 2 has reduced opacity, the laser beam is less attenuated.
- the intensity of the laser beam 10 is adjusted so as to result in a modulation of the ablation effect which the laser beam 10 has on the reflector layer 8 applied to the embossing layer 7.
- embossing layer 7 Due to the structuring ablation on the underside 6, exposed portions of the embossing layer 7 are produced in individual areas in the register for the watermark 3. These sections no longer act as a reflective hologram. Only the areas in which the metallization 8 remained and acts as a reflector layer do so. In order to prevent regions with an exposed hologram structure 9 from being able to be visually perceived under certain viewing conditions, a protective lacquer 13 is additionally applied which covers the entire embossing layer 7 at least in the uncovered regions. A precise structuring is not required because it is completely harmless when the resist 13 also covers the reflector layer 8.
- the protective lacquer 13 Since the protective lacquer 13 has a refractive index which deviates at most 0.2 from that of the embossing layer 7, the protective lacquer equalizes the hologram structure 9 in the uncovered regions in which no reflector layer 8 is present, leaving a remaining, slightly perceptible holographic effect optically disappear completely.
- top 5 (wire side) and bottom 6 (felt side) are interchangeable, i.
- Stamping layer 7 and reflector layer 8 eg metallization could also be applied to the screen side.
- Fig. 1 shows the manufacturing method for a substrate 2, which has a watermark 3 in the form of depressions 4.
- Fig. 2 refers to an embodiment in which the watermark 3 is generated by a watermark color 11.
- the structuring of the reflector layer 8 takes place in the same way - with the difference that the not printed with watermark ink 11 areas of the substrate correspond to the wells 4, so are areas with lower opacity of the substrate 2.
- Fig. 2 shows yet another, optional embodiment to the effect that after the structured removal of the reflector layer 8 additionally a further mirror layer 12 is applied, which is not further structured. It thus covers both the reflector layer 8 and the reflector layer 8 exposed areas of the hologram structure 9 from.
- the mirror layer 12 differs from the reflector layer 8 in terms of their color effect.
- two hologram structures are created, which complement one another register-specifically, the hologram structure with the reflector layer 8 and mirror layer 12 lying over it (eg also metallization), which produce a first color effect for the reflective hologram, the hologram structure only with the mirror layer 12, which causes a second color effect for the hologram structure, and the watermark 3.
- this embodiment with the further mirror layer 12 also with a real watermark according to Fig. 1 and is not limited to being implemented with a watermark color 11.
- the same applies to the protective coating 13, which is also in Fig. 2 can be used.
- the substrate 2 contains printable windows or if it is fully transparent, there is additionally a different holographic effect of top side 5 and bottom side 6. A two-sided different coloration of the hologram in perfect register is then obtained.
- embossing layer and / or the reflector layer with a laser-modifiable substance, which is modified during removal with the laser radiation, so that in addition a colored motif is obtained, which is in register with the watermark 3 and the hologram.
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Abstract
Die Erfindung betrifft ein Verfahren zum Herstellen eines Sicherheitselementes (1), wobei ein Substrat (2) bereitgestellt wird, das zumindest für bestimmte Strahlung (10) transluzent ist und ein Wasserzeichen (3) aufweist, welches die Opazität des Substrates (2) moduliert, wobei auf eine Seite (6) des Substrats (2) eine Prägeschicht (7) aufgebracht wird, die das Wasserzeichen (3) überdeckt, eine Hologrammstruktur (9) in die Prägeschicht (7) geprägt wird und auf die Hologrammstruktur (9) eine Reflektorschicht (8) aufgebracht wird, und das Substrat (2) von der gegenüberliegenden Seite (6) mit der bestimmten Strahlung (10) durchstrahlt wird, wobei eine Intensität der Strahlung (10) so eingestellt wird, dass das Wasserzeichen (3) mittels der von ihm bewirkten Opazitätsmodulation als Maske wirkt und die Reflektorschicht (8) durch die Strahlung (10) im Passer zum Wasserzeichen (5,11) strukturiert abgetragen wird.The invention relates to a method for producing a security element (1), wherein a substrate (2) is provided that is translucent at least for certain radiation (10) and has a watermark (3) which modulates the opacity of the substrate (2). wherein on one side (6) of the substrate (2) an embossing layer (7) is applied, which covers the watermark (3), a hologram structure (9) is embossed in the embossing layer (7) and on the hologram structure (9) a reflector layer (8) is applied, and the substrate (2) from the opposite side (6) with the particular radiation (10) is irradiated, wherein an intensity of the radiation (10) is adjusted so that the watermark (3) by means of it caused opacity modulation acts as a mask and the reflector layer (8) by the radiation (10) in the register to the watermark (5,11) is removed structured.
Description
Die Erfindung betrifft ein Verfahren zum Herstellen eines Sicherheitselementes, wobei ein Substrat bereitgestellt wird, das zumindest für bestimmte Strahlung transluzent ist und ein Wasserzeichen aufweist, welches die Opazität des Substrates moduliert.The invention relates to a method for producing a security element, wherein a substrate is provided which is translucent at least for certain radiation and has a watermark which modulates the opacity of the substrate.
Zur Erhöhung der Fälschungssicherheit geschützter Gegenstände, beispielsweise von Banknoten, sind Wasserzeichen bekannt. Sie werden üblicherweise bei der Herstellung des Substrates eingebracht, aus dem das Sicherheitselement gefertigt wird, meist ein Papier. Wasserzeichen sind bei Durchlichtbetrachtung des Sicherheitselementes gut erkennbar, da sie die Opazität des Substrates modifizieren. In der Regel wird bei der Herstellung des Papiers die Dicke des Substrates variiert, so dass eine lokale Dickenreduzierung zu einer lokalen Opazitätsreduzierung führt. Es sind aber auch andere Ansätze zum Erzeugen eines Wasserzeichens bekannt, beispielsweise mithilfe sogenannter Wasserzeichenfarben, die ebenfalls lokal die Opazität des Substrates modifizieren.To increase the security against forgery of protected objects, for example banknotes, watermarks are known. They are usually introduced in the production of the substrate from which the security element is made, usually a paper. Watermarks are easily recognizable when the security element is viewed through transmitted light, since they modify the opacity of the substrate. As a rule, in the production of the paper, the thickness of the substrate is varied, so that a local reduction in thickness leads to a local reduction in opacity. However, other approaches to generating a watermark are also known, for example using so-called watermark colors, which also locally modify the opacity of the substrate.
Wasserzeichen werden bei der Herstellung des Ausgangsmaterials für das Sicherheitselement, beispielsweise bei der Herstellung eines Banknotenpapiers, im Substrat gebildet. Bedingt durch Schwankungen im Schneideprozess eines Papiersubstrates, weisen Papierbogen üblicherweise Schwankungen der Lage des Wasserzeichens auf, die im Millimeter-Bereich sind. Deshalb ist es schwierig, andere Sicherheitsmerkmale in exakter Lage zum Wasserzeichen anzuordnen, also zu passern.Watermarks are formed in the substrate in the production of the security material starting material, for example in the manufacture of banknote paper. Due to variations in the cutting process of a paper substrate, paper sheets usually have variations in the position of the watermark, which are in the millimeter range. Therefore, it is difficult to arrange other security features in an exact location to the watermark, so to pass.
Um ein Sicherheitsmerkmal im Passer zu einem Wasserzeichen aufzubringen, schildert es die
Die
Zum Absichern von Gegenständen oder Dokumenten vor Fälschungen sind Hologramme bekannt. Sie sind besonders schwer zu fälschen.Holograms are known for securing items or documents from counterfeiting. They are particularly hard to fake.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren anzugeben, mit dem ein Sicherheitselement erzeugt wird, bei dem ein Hologrammbild im Passer zu einem Wasserzeichen liegt.The invention has for its object to provide a method by which a security element is generated in which a hologram image in the register is a watermark.
Diese Aufgabe wird erfindungsgemäß gelöst mit einem Verfahren zum Herstellen eines Sicherheitselementes, wobei ein Substrat bereitgestellt wird, das zumindest für bestimmte Strahlung transluzent ist und ein Wasserzeichen aufweist, welches die Opazität des Substrates moduliert, wobei auf eine Seite des Substrats eine Prägeschicht aufgebracht wird, die das Wasserzeichen mindestens teilweise überdeckt, eine Holgrammstruktur in die Prägeschicht geprägt wird und auf die Holgrammstruktur eine Reflektorschicht aufgebracht wird, und das Substrat von der gegenüberliegenden Seite mit der bestimmten Strahlung durchstrahlt wird, wobei eine Intensität der Strahlung so eingestellt wird, dass das Wasserzeichen mittels der von ihm bewirkten Opazitätsmodulation als Maske wirkt und die Reflektorschicht durch die Strahlung im Passer zum Wasserzeichen strukturiert abgetragen wird.This object is achieved according to the invention with a method for producing a security element, wherein a substrate is provided which is translucent at least for certain radiation and a watermark which modulates the opacity of the substrate, wherein on one side of the substrate an embossing layer is applied, which at least partially covers the watermark, a holgram structure is embossed into the embossing layer and a reflector layer is applied to the hologram structure, and the substrate from the opposite side is irradiated with the particular radiation, wherein an intensity of the radiation is adjusted so that the watermark acts by means of the opacity modulation effected by him as a mask and the reflector layer is removed by the radiation in the register to the watermark structured.
Die Erfindung baut auf dem Konzept der
Bei dem Wasserzeichen kann es sich um ein sogenanntes "echtes Wasserzeichen" handeln, wenn das Substrat ein Papiersubstrat ist. Das Wasserzeichen ist dann durch Vertiefungen an einer Siebseite des Substrates gebildet und moduliert die Dicke des Substrates. Es ist dann bevorzugt, die Prägeschicht und die Reflektorschicht auf der gegenüberliegenden Filzseite des Substrates aufzubringen, da diese eben ist. Ein Wasserzeichen, das die Opazität eines Substrats moduliert, kann anstatt durch eine Variation der Dicke des Substrats auch durch eine sogenannte Wasserzeichenfarbe erzeugt werden. Die Wasserzeichenfarbe bewirkt hierbei eine Reduzierung der Streuung von Licht im Substratkern. Grundsätzlich beruht Streuung auf einer großen Anzahl von Grenzflächen von Fasern, organischen und anorganischen Füllstoffen, Leim usw. zur umgebenden Luft. Diese Grenzflächen zur umgebenden Luft werden durch geeignete Bindemittelkomponenten in der Wasserzeichenfarbe deutlich reduziert, so dass in diesen Bereichen die Opazität abnimmt. Eine derartige Bindemittelkomponente ist beispielsweise Glyzerin, das in das Substrat eindringt und in den Poren des Substrats verbleibt. Analoges gilt gleichermaßen, wenn das Wasserzeichen durch eine Färbung, welche die Opazität des Substrates moduliert, bewirkt ist.The watermark may be a so-called "true watermark" if the substrate is a paper substrate. The watermark is then formed by depressions on a screen side of the substrate and modulates the thickness of the substrate. It is then preferred to apply the embossing layer and the reflector layer on the opposite felt side of the substrate, since this is flat. A watermark that modulates the opacity of a substrate can also be generated by a so-called watermark color, rather than by varying the thickness of the substrate. The watermark color causes a reduction of the scattering of light in the substrate core. Basically, scattering is due to a large number of interfaces of fibers, organic and inorganic fillers, glue, etc. to the surrounding air. These ambient airborne interfaces are significantly reduced by suitable binder components in the watermark ink, thus decreasing opacity in these areas. Such a binder component is, for example, glycerol, which penetrates into the substrate and remains in the pores of the substrate. The same applies analogously if the watermark is caused by a coloration which modulates the opacity of the substrate.
Ein weitere Möglichkeit die Opazität des Substrates zu modulieren, sind Substratabtragungen und/ oder Substrataussparungen durch beispielsweise Lasertechnologie, Schleifen und/ oder Stanzen, gegebenenfalls in Kombination mit einem papiermacherisch hergestellten Wasserzeichen und/ oder einer Wasserzeichenfarbe.Another possibility to modulate the opacity of the substrate are substrate erosions and / or substrate recesses by, for example, laser technology, grinding and / or punching, optionally in combination with a paper-made watermark and / or a watermark color.
Zusätzlich kann das Hologramm mit einer Stahldruckverprägung kombiniert werden. Eine Stahldruckverprägung geht durch das gesamte Substrat und führt zu einer taktil wahrnehmbaren Struktur, die vergleichsweise grober ist als die Hologrammstruktur.In addition, the hologram can be combined with a Stahldruckverprägung. A steel print embossment passes through the entire substrate and leads to a tactile perceptible structure that is comparatively coarser than the hologram structure.
Die Reflektorschicht kann mit weiteren Pigmenten oder Farbstoffen zur Erzeugung weiterer registerhaltiger Effekte versehen werden.The reflector layer can be provided with further pigments or dyes to produce additional register-containing effects.
Als Prägeschicht kommt ein UV-härtbarer Prägelack oder ein thermoplastischer Lack in Frage.The embossing layer can be a UV-curable embossing lacquer or a thermoplastic lacquer.
Die Prägeschicht oder die Reflektorschicht können mit lasersensitiven Farbstoffen versehen werden, so dass sich das Hologramm, welches durch die Hologrammstruktur erzeugt ist, ein zusätzliches Farbmotiv durch die lasersensitiven Farbstoffe, die bei der Ablation modifiziert wurden, und das Wasserzeichen registergenau ergänzen.The embossing layer or the reflector layer can be provided with laser-sensitive dyes, so that the hologram, which is produced by the hologram structure, complement an additional color motif by the laser-sensitive dyes which were modified during the ablation and the watermark in register.
Es ist möglich, nach dem Abtragen mit der Laserstrahlung eine andersfarbige Spiegelschicht aufzubringen, so dass sich das reflektive Hologramm in der Farbe der Reflektorschicht, das reflektive Hologramm in Farbe der andersfarbigen Spiegelschicht und das Wasserzeichen registergenau ergänzen.After removal with the laser radiation, it is possible to apply a different colored mirror layer, so that the reflective hologram in the color of the reflector layer, the reflective hologram in color of the differently colored mirror layer and the watermark complement each other in register.
Unter dem Begriff Hologrammstruktur wird allgemein eine diffraktive Struktur verstanden, insbesondere eine diffraktive Struktur, die ein Hologramm erkennbar macht. Es sind aber auch andere diffraktive Effekte möglich.The term hologram structure is generally understood to mean a diffractive structure, in particular a diffractive structure, which makes a hologram recognizable. But there are also other diffractive effects possible.
Der in dieser Beschreibung verwendete Begriff "bestimmte Strahlung" bringt deshalb zum Ausdruck, dass sie die Reflektorschicht abtragen kann. Die Ablation ist dann erreicht, wenn die bestimmte Strahlung beim Austritt an der Seite der Reflektorschicht eine zur Ablation geeignete Intensität hat. Die durch das Wasserzeichen bewirkte Opazitätsmodulation mindert die Intensität der Strahlung auf der Seite, auf der sich die Reflektorschicht befindet. Die eingestrahlte Strahlungsintensität wird deshalb so eingestellt, dass die Opazitätsmodulation, welche durch das Wasserzeichen bewirkt ist, zu einer Strahlungsmodulation führt, welche die Ablationswirkung moduliert. So dient das Wasserzeichen als Maske bei der Durchstrahlung des Substrates mit der bestimmten Strahlung.The term "certain radiation" as used in this description therefore expresses that it can remove the reflector layer. The ablation is achieved when the particular radiation has an intensity suitable for ablation at the exit on the side of the reflector layer. The opacity modulation caused by the watermark reduces the intensity of the radiation on the side on which the reflector layer is located. The irradiated radiation intensity is therefore adjusted so that the opacity modulation, which is caused by the watermark, results in a radiation modulation which modulates the ablation effect. Thus, the watermark serves as a mask in the irradiation of the substrate with the specific radiation.
Zu schützende Gegenstände im Rahmen dieser Beschreibung können beispielsweise Sicherheitspapiere, Ausweis- und Wertdokumente (wie z. B. Banknoten, Chipkarten, Pässe, Karten, Identifikationskarten, Ausweiskarten, Aktien, Anleihen, Urkunden, Gutscheine, Schecks, Eintrittskarten, Kreditkarten, Gesundheitskarten, ...) sowie Produktsicherungselemente, wie z.B. Etiketten, Siegel, Verpackungen, sein.Items to be protected within the scope of this description may include, for example, security papers, identity and value documents (such as banknotes, chip cards, passports, cards, identification cards, identity cards, stocks, bonds, certificates, vouchers, checks, tickets, credit cards, health cards,. ..) as well as product security elements, such as Labels, seals, packaging, be.
Unter dem Begriff Sicherheitspapier wird hier insbesondere die noch nicht umlauffähige Vorstufe zu einem Wertdokument (z. B. einer Karte) verstanden, die neben dem erfindungsgemäß hergestellten Druck beispielsweise auch weitere Echtheitsmerkmale (wie z. B. im Volumen vorgesehene Lumineszenzstoffe) aufweisen kann. Unter Wertdokumenten werden hier einerseits aus Sicherheitspapieren hergestellte Dokumente, z. B. Banknoten, verstanden. Andererseits können Wertdokumente auch sonstige Dokumente und Gegenstände sein, die mit dem erfindungsgemäßen Druckverfahren bearbeitet sind, damit die Wertdokumente nicht kopierbare Echtheitsmerkmale aufweisen, wodurch eine Echtheitsüberprüfung möglich ist und zugleich unerwünschte Kopien verhindert werden.The term security paper is understood here in particular as the precursor that can not yet be processed to form a value document (eg a card) which, in addition to the pressure produced according to the invention, can also have further authenticity features (such as luminescent substances provided in the volume, for example). Under value documents here on the one hand from security papers produced documents, eg. B. banknotes understood. On the other hand, value documents can also be other documents and articles which are processed with the printing method according to the invention, so that the value documents have non-copyable authenticity features, whereby an authenticity check is possible and at the same time unwanted copies are prevented.
Das Substrat besteht besonders bevorzugt aus Papier aus Baumwollfasern, bzw. im Wesentlichen aus dem natürlichen Polymer-Cellulose, wie es beispielsweise für Banknoten verwendet wird. Bevorzugt kann das Substrat auch aus Papier aus anderen natürlichen Fasern, ebenso bevorzugt aus Synthesefasern, d.h. einer Mischung aus natürlichen und synthetischen Fasern bestehen. Weiter bevorzugt besteht das Substrat aus einer Kombination aus mindestens zwei übereinander angeordneten und miteinander verbundenen unterschiedlichen Substraten, einem sogenannten Hybrid. Es kann sich beispielsweise um eine Kombination Kunststofffolie-Papier oder auch um einen dreischichtigen Verbund handeln, wie Kunststofffolie-Papier-Kunststofffolie, d.h. ein Substrat aus Papier wird auf jeder seiner beiden Seiten durch eine Kunststofffolie bedeckt, oder Papier-Kunststofffolie-Papier, d.h. ein Substrat aus einer Kunststofffolie wird auf jeder seiner beiden Seiten durch ein Substrat aus Papier bedeckt.The substrate is particularly preferably made of paper made of cotton fibers, or substantially of the natural polymer-cellulose, as it is used for example for banknotes. Preferably, the substrate may also be made of paper of other natural fibers, also preferably of synthetic fibers, ie a mixture of natural and synthetic fibers consist. More preferably, the substrate consists of a combination of at least two superimposed and interconnected different substrates, a so-called hybrid. It may be, for example, a combination of plastic film paper or even a three-layer composite, such as plastic film paper plastic film, ie a paper substrate is covered on either side by a plastic film, or paper plastic film paper, ie Substrate made of a plastic film is covered on each side by a paper substrate.
Optional besteht das Substrat aus einer mindestens teilweise transparenten Kunststofffolie. Das Wasserzeichen wird in diesem Fall durch eine Farbe erzeugt, die auf eine Seite des Substrats aufgebracht ist und deren Farbton dem Farbton des Substrats mindestens ähnlich ist. Ein derartiges Wasserzeichen ist beispielsweise aus
Kunststofffolien können beispielsweise Polypropylen, Polyethylen, Polyethylentherephthalat und Polyamid umfassen.Plastic films may include, for example, polypropylene, polyethylene, polyethylene terephthalate, and polyamide.
Unter Transluzenz bzw. transluzent wird in dieser Beschreibung die partielle Lichtdurchlässigkeit eines Körpers verstanden, also die Eigenschaft, Licht streuend durchlassen. Transluzenz ist unter anderem in Abgrenzung zur Transparenz (= Bild- oder Blickdurchlässigkeit) zu sehen. Die reziproke Eigenschaft der Transluzenz ist die Opazität. Soweit hier die Rede davon ist, dass ein Wasserzeichen die Opazität moduliert, kann gleichermaßen davon gesprochen werden, dass es invers dazu die Transluzenz moduliert.Under translucency or translucent in this description, the partial translucency of a body understood, so the property of transmitting light scattering. Translucency is to be seen, among other things, in contrast to the transparency (= image or eye transmittance). The reciprocal property of translucency is opacity. As far as there is talk here that a watermark modulates the opacity, it can equally be said that it inversely modulates the translucency.
Es versteht sich, dass die vorstehend genannten und die nachstehend noch zu erläuternden Merkmale nicht nur in den angegebenen Kombinationen, sondern auch in anderen Kombinationen oder in Alleinstellung einsetzbar sind, ohne den Rahmen der vorliegenden Erfindung zu verlassen.It is understood that the features mentioned above and those yet to be explained not only in the combinations indicated, but also in other combinations or alone, without departing from the scope of the present invention.
Nachfolgend wird die Erfindung beispielshalber anhand der beigefügten Zeichnungen, die auch erfindungswesentliche Merkmale offenbaren, noch näher erläutert ist. Es zeigen:
- Fig. 1
- eine Schnittdarstellung durch ein Sicherheitselement in einer ersten Ausführungsform und
- Fig. 2
- eine Schnittdarstellung ähnlich der
Fig. 1 durch ein Sicherheits-element einer zweiten Ausführungsform.
- Fig. 1
- a sectional view through a security element in a first embodiment and
- Fig. 2
- a sectional view similar to the
Fig. 1 by a security element of a second embodiment.
Auf der Unterseite 6 ist eine Prägeschicht 7 aufgebracht, auf der sich eine Reflektorschicht 8, z. B. eine Metallisierung, befindet. In die Prägeschicht 7 wird vor dem Auftragen der Reflektorschicht 8 eine Hologrammstruktur 9 eingeprägt, die zusammen mit der Reflektorschicht 8 ein in Reflektion wirksames Hologramm bei Betrachtung an der Oberseite 5 erkennbar macht. Die Reflektorschicht 8 wird zuerst flächig aufgebracht, d.h. ohne anfängliche Strukturierung. Ein Strukturierung erfolgt, indem von der Oberseite 5 Laserstrahlung 10 eingestrahlt wird, deren Intensität so eingestellt ist, dass sie in den Bereichen der Vertiefungen 4 die Reflektorschicht 8 nach dem Durchtritt durch das Substrat 2 von der Prägeschicht 7 abträgt. In Bereichen ohne Vertiefungen 4 ist die Intensität der Laserstrahlung 10 so weit abgeschwächt, dass keine Abtragung der Reflektorschicht 8 mehr erfolgt. Mit anderen Worten, die Intensität der Laserstrahlung 10 wird exakt so eingestellt, dass beim Durchtritt durch das Substrat 2 in nicht reduzierter Dicke gerade keine Abtragung der Reflektorschicht 8 mehr erfolgt, bei reduzierter Dicke aufgrund der Vertiefungen 4 jedoch eine Abtragung erreicht wird. Auf diese Weise moduliert das Wasserzeichen 3 den Abtrag der Reflektorschicht 8.On the bottom 6 a
Von der Oberseite 5 wird der Laserstrahl 10 über das Substrat 2 geführt. Er durchstrahlt das Substrat 2. Die Wellenlänge des Laserstrahls ist derart, dass die Reflektorschicht 8 die Strahlung absorbiert. Der Laserstrahl 10 wird abhängig von der Opazität des Substrates 2, welche durch das Wasserzeichen 3 moduliert ist, abgeschwächt. An einer Stelle, an der das Substrat durch das Wasserzeichen eine hohe Opazität hat, wird der Laserstrahl 10 stark abgeschwächt. An einer Stelle, an der das Substrat 2 reduzierte Opazität hat, wird der Laserstrahl weniger abgeschwächt. Die Intensität des Laserstrahls 10 wird so eingestellt, dass sich eine Modulation der Ablationswirkung ergibt, die der Laserstrahl 10 auf die auf die Prägeschicht 7 aufgebrachte Reflektorschicht 8 hat.From the
Durch die strukturierende Ablation an der Unterseite 6 werden in einzelnen Bereichen im Passer zum Wasserzeichen 3 freiliegende Abschnitte der Prägeschicht 7 erzeugt. Diese Abschnitte wirken nicht mehr als reflektives Hologramm. Das tun nur noch die Bereiche, in denen die Metallisierung 8 verblieb und als Reflektorschicht wirkt. Um zu verhindern, dass Bereiche mit freigelegter Hologrammstruktur 9 unter bestimmten Betrachtungsbedingungen optisch noch wahrnehmbar sein könnten, wird zusätzlich ein Schutzlack 13 aufgebracht, der die gesamte Prägeschicht 7 zumindest in den freigelegten Bereichen überdeckt. Eine präzise Strukturierung ist dabei nicht erforderlich, da es völlig unschädlich ist, wenn der Schutzlack 13 auch die Reflektorschicht 8 abdeckt. Da der Schutzlack 13 eine Brechzahl hat, die maximal 0,2 von der der Prägeschicht 7 abweicht, egalisiert der Schutzlack die Hologrammstruktur 9 in den freigelegten Bereichen, in denen keine Reflektorschicht 8 mehr vorhanden ist, und lässt einen verbleibenden, geringfügig wahrnehmbaren holografischen Effekt optisch gänzlich verschwinden.Due to the structuring ablation on the
Grundsätzlich sind Oberseite 5 (Siebseite) und Unterseite 6 (Filzseite) vertauschbar, d.h. Prägeschicht 7 und Reflektorschicht 8 (z. B. Metallisierung) könnten auch auf die Siebseite appliziert werden.Basically, top 5 (wire side) and bottom 6 (felt side) are interchangeable, i. Stamping
Beinhaltet das Substrat 2 bedruckbare Fenster oder ist es voll transparent, ergibt sich zusätzlich ein unterschiedlicher holografischer Effekt von Oberseite 5 und Unterseite 6. Man erhält dann eine zweiseitige unterschiedliche Farbigkeit des Hologramms in perfektem Register.If the
Weiter ist es möglich, die Prägeschicht und/ oder die Reflektorschicht mit einer lasermodifizierbaren Substanz zu versehen, die beim Abtragen mit der Laserstrahlung modifiziert wird, so dass zusätzlich ein farbiges Motiv erhalten wird, das im Register zum Wasserzeichen 3 und dem Hologramm steht.Further, it is possible to provide the embossing layer and / or the reflector layer with a laser-modifiable substance, which is modified during removal with the laser radiation, so that in addition a colored motif is obtained, which is in register with the
- 11
- Sicherheitselementsecurity element
- 22
- Substratsubstratum
- 33
- Wasserzeichenwatermark
- 44
- Vertiefungdeepening
- 55
- Oberseitetop
- 66
- Unterseitebottom
- 77
- Prägeschichtembossing layer
- 88th
- Reflektorschichtreflector layer
- 99
- Hologrammstrukturhologram structure
- 1010
- Laserstrahllaser beam
- 1111
- WasserzeichenfarbeWatermark Color
- 1212
- Spiegelschichtmirror layer
- 1313
- Schutzlackprotective lacquer
Claims (7)
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DE102016009440.0A DE102016009440A1 (en) | 2016-08-03 | 2016-08-03 | Method for producing a security element |
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US20220242159A1 (en) * | 2019-05-22 | 2022-08-04 | Sicpa Holding Sa | Security document and manufacturing method thereof |
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DE102017010744A1 (en) | 2017-11-21 | 2019-05-23 | Giesecke+Devrient Currency Technology Gmbh | Method for producing a security element with an opening in a metallic layer produced by laser radiation |
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WO2009127325A1 (en) * | 2008-04-16 | 2009-10-22 | Giesecke & Devrient Gmbh | Method for producing a security or value document |
EP2199095A2 (en) | 2008-12-17 | 2010-06-23 | Giesecke & Devrient GmbH | Safety element for data carrier and method for producing same |
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US20220242159A1 (en) * | 2019-05-22 | 2022-08-04 | Sicpa Holding Sa | Security document and manufacturing method thereof |
US11712917B2 (en) * | 2019-05-22 | 2023-08-01 | Sicpa Holding Sa | Security document and manufacturing method thereof |
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