EP4045330B1 - Methode de marquage et identification de produits - Google Patents

Methode de marquage et identification de produits

Info

Publication number
EP4045330B1
EP4045330B1 EP20780186.1A EP20780186A EP4045330B1 EP 4045330 B1 EP4045330 B1 EP 4045330B1 EP 20780186 A EP20780186 A EP 20780186A EP 4045330 B1 EP4045330 B1 EP 4045330B1
Authority
EP
European Patent Office
Prior art keywords
product
unique code
ink formulation
printing
code
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP20780186.1A
Other languages
German (de)
English (en)
Other versions
EP4045330C0 (fr
EP4045330A1 (fr
Inventor
Tobias Jochum
Armin Wedel
Jan Niehaus
Bert Fischer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV filed Critical Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV
Publication of EP4045330A1 publication Critical patent/EP4045330A1/fr
Application granted granted Critical
Publication of EP4045330C0 publication Critical patent/EP4045330C0/fr
Publication of EP4045330B1 publication Critical patent/EP4045330B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—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
    • B42D25/382—Special inks absorbing or reflecting infrared light

Definitions

  • the present invention is based on a method for marking products using an ink formulation containing semiconducting inorganic nanocrystals that emit radiation in the range of 750-1800 nm under photon excitation, in serialization and/or track & trace systems.
  • This invention addresses precisely this issue.
  • This invention thus represents a combination of track & trace technology and optical security features. This unifies the traceability and authentication processes of products.
  • Track & Trace Programs ( US$9,027,147 ; US$8,898,007 ; US 2009/0096871 ; US 8,700,501 ) are used to ensure the clear tracking and tracing of all process steps in the production and supply chain. They also enable comprehensive control options for the manufacturer and transparency for the consumer, as the locations and routes of products can be seamlessly documented.
  • NIR near-infrared
  • EP 0 933 407 US 5,282,894 ; US 5,665,151 ; WO 1998/018871 ; WO 2003/038003 ; US$10,119,071 ; US 5,542,971
  • these organic NIR dyes have some disadvantages, such as low quantum yield below 20%, low thermal stability and high susceptibility to external influences such as oxidation or photobleaching, whereby these dyes often lose more than 50% of their original fluorescence intensity (quantum yield) even at low irradiation exposure.
  • WO 2008/053202 A2 discloses a method for marking and identifying products.
  • the present invention is based on the concept that the optical security feature is invisible to the human eye and can only be detected with the help of optical detection systems (e.g., spectrometers or NIR camera systems) and, if necessary, mobile devices (e.g., smartphones, tablets, etc.) or other appropriate reading devices.
  • optical detection systems e.g., spectrometers or NIR camera systems
  • mobile devices e.g., smartphones, tablets, etc.
  • NIR rays are emitted by inorganic materials.
  • This optical security feature is undetectable to the human eye by a product counterfeiter. Only after excitation with higher energy than the emission signal (e.g., blue and/or white light), which is generated, for example, by end devices such as smartphone or tablet flashes or appropriately equipped reading devices, as well as higher-energy NIR radiation, does the optical security feature emit NIR radiation. This radiation is detected by the reading device.
  • the emission signal e.g., blue and/or white light
  • the inorganic materials used are characterized by high stability against environmental influences and a special excitation and emission pattern that allows optical excitation and detection using commercially available devices such as smartphones or tablets. Furthermore, these materials exhibit a high quantum yield of over 20%, which is necessary for detection using such devices.
  • products labeled in this way are more counterfeit-proof, as counterfeiters would have to synthesize the respective inorganic materials, disperse them in the respective ink formulations, and print the corresponding codes.
  • the inorganic material used can be directly identified with the help of software (e.g., a spectrometer for smartphones).
  • the present invention relates to a method according to claim 1.
  • product in the sense of the present invention includes the products themselves, insofar as they can be marked, their packaging, product tags, barcode cards and barcode labels, as well as all other possibilities with which a product would usually be marked during the production process and/or transport, including the documentation.
  • in the sense of the present invention includes any solvent and combinations thereof as well as typical additives suitable for producing a printable liquid.
  • printing in the context of the present invention encompasses the deposition of pigments onto or into a solid substrate. Typical examples include, but are not limited to, digital printing, inkjet printing, screen printing, transfer printing, stamp printing, roll-to-roll printing, non-contact printing, laser printing, and other processes.
  • the Figures 4 from show examples of individual printing inaccuracies or printing defects of a single printer, which can be used as an individual and unique pattern to generate a unique code.
  • the present invention relates to a method according to claim 1.
  • an ink formulation contains semiconducting inorganic nanocrystals that emit radiation in the range of 750-1800 nm under photon excitation
  • the ink formulation is preferably a commercially available ink formulation suitable for the deposition of pigments onto or into a solid substrate.
  • Typical examples include, but are not limited to, digital printing, inkjet printing, screen printing, transfer printing, stamp printing, roll-to-roll printing, non-contact printing, laser printing, and other processes.
  • This ink formulation may already contain color pigments. This makes the unique code printed with the ink formulation visible to the human eye. The detection of the radiation emitted by the irradiated product in the range of 750-1800 nm thus provides an additional optical security feature in addition to the visible unique code.
  • the ink formulation contains no additional color pigments other than the semiconducting inorganic nanocrystals.
  • the unique code printed with the ink formulation is invisible to the human eye due to the concentration of the ink formulation. The unique code is therefore not immediately visible but can only be detected and read after irradiating the product printed with the ink formulation with photons by detecting the radiation emitted by the irradiated product in the range of 750-1800 nm.
  • a unique code is first printed onto at least one surface of the product using a commercially available ink formulation.
  • the ink formulation containing the semiconducting inorganic nanocrystals is then printed onto the existing unique code in a point-like manner in the form of drops and/or in the form of another unique code.
  • the ink formulation according to the invention preferably contains no pigments, so that the Drops and/or the other unique code are not visible to the human eye.
  • the unique code according to any one of the preceding embodiments is printed on at least one label, which is then adhered to at least one surface of the product.
  • the unique code according to any one of the first three embodiments is printed on product tags, barcode cards and/or barcode labels.
  • the ink formulation contains two or more, for example 2, 3, 4, 5, 6, or 7, differently emitting semiconducting inorganic nanocrystals as well as additional color pigments.
  • the unique code printed with the ink formulation is visible to the human eye. The detection of the radiation emitted by the irradiated product in the range of 750-1800 nm is thus a further optical security feature in addition to the visible unique code. Both the different emission maxima and the respective (intensity) ratios can also be stored in at least one database.
  • the ink formulation contains two or more, for example 2, 3, 4, 5, 6, or 7, differently emitting semiconducting inorganic nanocrystals without additional color pigments.
  • the unique code printed with the ink formulation is not visible to the human eye due to the concentration.
  • the detection of the radiation emitted by the irradiated product in the range of 750-1800 nm thus represents another optical security feature in addition to the visible, unique code.
  • Both the different emission maxima and the respective (intensity) ratios can also be stored in at least one database.
  • the semiconducting inorganic nanocrystals are preferably selected from the group of perovskites, I-VI semiconductors, II-VI semiconductors, III-V semiconductors, IV-VI semiconductors, I-III-VI semiconductors, carbon dots and mixtures thereof.
  • suitable semiconducting inorganic nanocrystals include AgS, AgSe, AgTe, CdS, CdSe, CdTe, PbS , PbSe, PbTe, SnTe, ZnS, ZnSe, ZnTe, InP, InAs, Cu2S , In2S3 , InSb, GaP, GaAs, GaN, InN, InGaN,ZnSSe, ZnSeTe, ZnSTe, CdSSe, CdSeTe, HgSSe, HgSeTe, HgSTe, ZnCdS, ZnCdSe, ZnCdTe, ZnHgS, ZnHgSe, ZnHgTe, CdHgS, CdHgSe, CdHgTe, ZnCdSSe, ZnHgSSe, ZnCdSeTe, ZnHgSeTe, CdH
  • perovskite materials having the general formula ABX 3 or A 4 BX 6 , where X can be selected from Cl, Br, I, O and/or mixtures thereof, where A can be selected from Cs, CH 3 NH 3 , CH(NH 2 ) 2 , Ca, Sr, Bi, La, Ba, Mg and/or mixtures thereof, where B can be selected from Pb, Sn, Sr, Ge, Mg, Ca, Bi, Ti, Mn, Fe and/or mixtures thereof.
  • core/shell and/or core/multishells of semiconducting inorganic nanocrystal architectures of II-VI, III-V, IV-VI, I-VI, I-III-VI semiconductors or mixtures thereof as well as core/shell and/or core/multishells of perovskite materials are further suitable examples.
  • the crystal lattice of the semiconducting inorganic nanocrystals may additionally, but not exclusively, be doped with one or more metal ions, such as Cu + , Mg 2+ , Co 2+ , Ni 2+ , Fe 2+ , Mn 2+ and/or with one or more rare earth metals, such as ytterbium, praseodymium or neodymium.
  • metal ions such as Cu + , Mg 2+ , Co 2+ , Ni 2+ , Fe 2+ , Mn 2+
  • rare earth metals such as ytterbium, praseodymium or neodymium.
  • the semiconducting inorganic nanocrystals preferably have an average particle size of 1 nm to 100 nm, more preferably of 2 nm to 50 nm and most preferably from 3 nm to 15 nm in at least one dimension, preferably in all dimensions.
  • the average particle size can be further increased or modified using various methods. Typical examples include, but are not limited to, a silica shell, a titanium oxide shell, a halogen shell, as well as other methods for increasing stability, masking, biocompatibility, water solubility, and/or encapsulation.
  • the semiconducting inorganic nanocrystals are preferably photoluminescent substances that are brought into electronically excited energy states by light absorption and then return to lower energy states by emitting light in the form of fluorescence.
  • the semiconducting inorganic nanocrystals are preferentially excited by visible light, such as blue or white light, as well as higher energetic NIR radiation than the emission signal (excitation).
  • the semiconducting inorganic nanocrystals emit radiation with a wavelength in the range of 750 to 1800 nm, more preferably 800 to 1400 nm, and most preferably 850 nm to 1100 nm, upon photon excitation. These wavelength ranges are in the invisible near-infrared range.
  • One of the interesting properties of the semiconducting inorganic nanocrystals for the present invention is that their excitation and emission spectrum depends, among other things, on their particle size.
  • the proportion of semiconducting inorganic nanocrystals in the ink formulation is preferably 0.01 to 70.0% by weight, more preferably 0.05 to 40.0% by weight, most preferably 0.1 to 30.0% by weight, measured on Total weight of the ink formulation. For digital and inkjet printing, a range between 0.01 and 10.0% by weight is preferred.
  • the ink formulation may contain semiconducting inorganic nanocrystals that have at least one or all, preferably all, of the following properties in common: emission wavelength, emission distribution, and emission maximum.
  • the ink formulation may contain mixtures of semiconducting inorganic nanocrystals that have different values for emission wavelength, emission distribution, and emission maximum.
  • the ink formulation can contain the color pigments of commercial inks.
  • Commercial ink formulations can be used and mixed with the semiconducting inorganic nanocrystals.
  • the emitted radiation of the ink formulation can result in an individual fluorescence spectrum that depends on the type, quantity and particle size of the semiconducting inorganic nanocrystals.
  • the individual fluorescence spectrum can be detected with a spectrometer.
  • the detected individual fluorescence spectrum can then be compared with a reference spectrum stored in a database.
  • this individual fluorescence spectrum can be used as an additional security feature for an ink formulation individually mixed by the product manufacturer.
  • the ink formulation for, for example, ink-jet printing preferably has a reciprocal Ohnesorg number of less than 14, more preferably from 1 to 10, even more preferably from 1 to 8 and most preferably from 2 to 4.
  • a unique code is generated to identify a product.
  • At least one reference value preferably several reference values of the product are first encrypted using a unique key.
  • Possible reference values include, for example, reference values relating to the type and nature of the product, such as serial numbers, lot numbers, CAS numbers for chemical products, the place of production, the time of production, the place of delivery, the producer, the supplier, the customer or similar.
  • the unique key can be an algorithm provided to the producer or created by the producer himself.
  • Encryption generates a code that is unique for the product, preferably for the individual packaging unit of the product.
  • This unique code can be a one-dimensional code, such as a barcode, a two-dimensional code, such as a QR code, or a three-dimensional code, such as a color barcode.
  • the unique code can also contain one or more patterns, such as areas, stripes, lines, geometric figures such as circles, triangles, rectangles, polygons, etc., alphanumeric characters, images, or combinations thereof.
  • the print usually shows no production inaccuracies.
  • an individual pattern is usually visible. This can be caused by, for example, blockages of the print glands, partial blockage of the print glands, deflection of the ink droplet or delayed deposition of the ink droplet from the print nozzle. This creates a random pattern at the micrometer level, which is unique for each printing process (fingerprint). This is shown as an example in the Figures 4 a and b are visualized.
  • This unique pattern can be extracted using IT applications into a unique code, which can also be stored in encrypted form in the database. This form of unique code can also be used to specifically individualize individual items, for example, individual species from a multi-unit product series.
  • the unique code can be derived from the pattern printed with the ink formulation according to the invention.
  • a pattern as described herein is first printed onto at least one surface of the product. This pattern is then analyzed for printing inaccuracies and printing defects, and an individual pattern is derived from it. This individual pattern can then be linked to the product's reference values as described herein and used as a unique code, optionally stored in a database.
  • This unique code from the individual pattern of printing inaccuracies and printing defects can also be encrypted, combined and/or encrypted and/or stored with another unique code created using conventional methods and containing further reference values of the product.
  • These two unique codes can be treated as individual unique codes, so that two unique codes are printed on the product, which encode different product reference values and are stored and detected as independent individual codes. Both individual codes can be printed using the ink formulation according to the invention. However, the second unique code, created using conventional methods, can also be printed using a conventional ink formulation.
  • the ink formulation is printed on at least one surface of the product in the form of this unique code.
  • each unit of the product is printed with its own unique code.
  • the step "printing the ink formulation on at least one area of the surface of the product in the form of this unique code” includes both the printing of the ink formulation directly on at least one area of the surface of the product, insofar as the nature of the product allows this, as well as the printing of the ink formulation on at least one label in the form of this unique code and the affixing/labelling of the surface of the product with at least one printed label.
  • the step of "printing the ink formulation on at least one surface of the product in the form of this unique code” may also include printing the ink formulation directly on at least one surface of the product's packaging or applying/labelling the product's surface with at least one printed label.
  • Standard printing methods are applicable, depending on the type of ink formulation.
  • the ink formulation is preferably printed onto at least one surface of the product using digital printing, screen printing, transfer printing, roll-to-roll printing, non-contact printing, or laser printing.
  • the unique code can be printed directly on the surface of the product, on the product packaging, as well as on labels, signs, barcode cards and/or barcode labels.
  • the ink formulation can also be printed in other patterns, such as areas, stripes, lines, geometric figures, such as Circles, triangles, rectangles, polygons, etc., alphanumeric characters, or combinations thereof, are printed on at least one surface of the product.
  • the printed pattern can serve as a pure authentication feature or contain information such as safety and usage instructions or manufacturer information.
  • the product printed with the ink formulation is irradiated with photons.
  • Photon irradiation brings the semiconducting inorganic nanocrystals contained in the ink formulation into excited energy states (excitation).
  • the product printed with the ink formulation is irradiated with blue or white light.
  • the light source can be a halogen lamp or LED lamp, preferably a blue or white LED lamp.
  • Another suitable light source for irradiation is an LED flash, such as the LED flash of a device such as a smartphone or tablet.
  • the irradiated product preferably the semiconducting inorganic nanocrystals in the ink formulation, emits radiation in the range of 750 to 1800 nm, preferably 800 to 1400 nm, most preferably 850 nm to 1100 nm. This is detected in a further step.
  • the emitted radiation can be detected with any suitable detection device.
  • the emitted radiation is preferably detected by a terminal device, such as a smartphone or tablet.
  • the camera systems of these devices usually have a silicon-based image sensor that can detect incoming photons up to a wavelength of approximately 1100 nm. This allows the detect radiation emitted by semiconducting inorganic nanocrystals via these image sensors.
  • the photoluminescent substance preferably the semiconducting inorganic nanocrystals in the ink formulation, must have a high quantum yield.
  • the semiconducting inorganic nanocrystals in the ink formulation preferably have a quantum yield in the range between 20 and 100%, more preferably in the range between 40 and 100%, most preferably 60 and 100%.
  • the quantum yield or quantum efficiency indicates the ratio between the number of emitted and absorbed photons.
  • the unique code can also be read using commercial barcode scanners if the unique code is visible to the human eye.
  • the detection of the radiation emitted by the semiconducting inorganic nanocrystals serves as an additional security feature.
  • the method according to the invention thus has the advantage of being usable by end consumers without any additional financial outlay. This provides retailers and end consumers with a simple and cost-effective method for verifying the authenticity of a product.
  • the method according to the invention can thus be used as an optical-based authentication solution.
  • the method can also be used in serialization and/or track & trace systems.
  • Serialization maps structured data into a sequential representation. Serialization is primarily used for transferring objects over the network in distributed software systems.
  • one or more reference values of a product can be recorded and/or encrypted using a unique key.
  • a corresponding serialization and/or track & trace computer program generates a unique code, which is printed on the product.
  • the code is also stored in a database, preferably a central database. The code can then be scanned at any time and read from the database.
  • the encrypted reference values of the product can then be read using the serialization and/or track & trace computer program.
  • the ink formulation is additionally printed in the form of the unique code on at least one area of the surface of a packaging group containing the product, for example selected from bundles, outer packaging, pallets.
  • the present method therefore represents a combination of Track & Trace technology and optical security features.
  • Figure 1 shows an overview of a possible embodiment of the method according to the invention.
  • reference values of a product such as the production location and period, product ingredients, dosage forms, etc.
  • a track & trace computer program then generates a code from these encrypted reference values.
  • This code can be a one-dimensional, two-dimensional, or three-dimensional code, e.g., a barcode, a QR code, or a color barcode.
  • This code is stored in a central database via the Track & Trace computer program.
  • the code is printed onto the surface of the product using the ink formulation disclosed herein.
  • This ink formulation preferably contains additional color pigments in addition to the semiconducting inorganic nanocrystals, so that the printed code is visible to the human eye.
  • the code can be printed directly onto the surface of the product or onto the product packaging.
  • the code printed using the ink formulation disclosed herein can now be used in two ways, firstly as a track and trace marking and secondly as an optical authentication marking.
  • the code can be read with a scanner. The code is then transferred to the track & trace computer program. The code is then read from the database and decoded. This provides the reference values of the marked product.
  • the code and any other possible markings using the ink formulation disclosed herein may also be used as optical authentication markings.
  • the surface of the product is irradiated with light, preferably white or blue light, preferably white or blue LED light.
  • the photoluminescent substance preferably the semiconducting inorganic nanocrystals in the ink formulation, are excited as discussed above and then emit fluorescent radiation in the range of 750–1800 nm (NIR radiation). This radiation cannot be perceived by the human eye. Instead, an electronic device capable of detecting NIR fluorescent radiation is required for detection. Suitable devices include spectrometers, NIR cameras, and also end devices such as smartphones or tablets, which have a silicon-based image sensor in their camera systems that can detect incident photons up to a wavelength of approximately 1100 nm. These end devices can also be used to excite the photoluminescent substance via the camera flash.
  • the flash for excitation and detection can be controlled via a corresponding app, so that after excitation and detection, a corresponding photo of the code appears on the device's screen. This photo thus serves as a visual authentication feature and allows the product to be authenticated.
  • the method according to the invention thus extends a serialization or track & trace system with an optical security feature that is not visible to the human eye.
  • This optical security feature can be detected by simple means that are also available to the end consumer, thus enabling simple and cost-effective authentication.
  • the semiconducting inorganic nanocrystals used have a high quantum yield and are insensitive to temperature fluctuations, oxidation and photobleaching.
  • Security can be further enhanced by using a specific blend of semiconducting inorganic nanocrystals with a specific particle size distribution and proportions in the ink formulation, which emits a specific fluorescence spectrum in the NIR range that can be detected using a spectrometer.
  • This specific fluorescence spectrum can, in turn, be used as an additional authentication feature.
  • the method according to the invention also has a clear cost advantage.
  • the present invention also relates to an optical security feature on at least one area of the surface of a product in the form of a unique code containing semiconducting inorganic nanocrystals which emit radiation in the range of 750-1800 nm upon photon excitation.
  • the invention relates to an optical security feature on at least one area of the surface of a product containing semiconducting inorganic nanocrystals which emit radiation in the range of 750-1800 nm when excited by photons.
  • the optical security feature is preferably printed on at least one surface of the product using the method according to the invention.
  • the present invention further relates to a serialization and/or track & trace system that includes an optical security feature comprising a unique code printed on a product as described herein.
  • the invention relates to the use of a unique code printed on a product as described herein as an optical security feature in a serialization and/or track & trace system.
  • the unique code is printed on the product or product packaging using the ink formulation described herein, which contains semiconducting inorganic nanocrystals that emit radiation in the range of 750-1800 nm when photon excited.
  • Figures 2 ad show examples of a one-dimensional barcode printed on white cardboard.
  • Figures 3 ac show further examples of a two-dimensional QR code printed on white cardboard.
  • Printability is crucial for ink formulations. This is defined by the reciprocal Ohnesorge number. If this value is greater than 14, the ink formulation is unsuitable for inkjet printing (digital printing). A Ohnesorge number between 1 and 10 is acceptable for inkjet technology. However, values between 2 and 4 are optimal.
  • This Ohnesorge number is mainly determined by the viscosity and surface tension of the ink formulation.
  • Figure 2d shows a picture of the fluorescence radiation emitted by the ink formulation in the NIR range.
  • a QR code was printed using an inkjet printer in different resolutions of 400 dpi ( Fig. 3 a) , 450 dpi ( Fig. 3 b) and 500 dpi ( Fig. 3 c) printed.
  • the color pigments in the ink formulation ensure that the code is always visible to the human eye.
  • Figures 4 a and b show examples of individual printing inaccuracies or printing defects of a single printer, which can be used as an individual and unique pattern to generate a unique code.
  • the print image in Figure 4 a was produced using the LP50 printer from Süss MicroTec and the Spectra SE128 AA printhead from Fujifilm.
  • the ink formulation was Spectra Test Ink Blue, also from Fujifilm.
  • the images were taken with the LP50's Printview camera.
  • the graduations of the "crosshairs" have a scale of 100 ⁇ m.
  • the substrate was photographic paper.
  • Within a row of print dots an individual pattern of Height shifts.
  • the third-to-last pressure point in a row exhibits a significant height difference from its neighboring points.
  • the print image in Figure 4 b was produced using an LP50 printer and a Spectra SE128 AA printhead.
  • the ink formulation was a mixture of SPR001 (a commercial fluorescent polymer from Merck), chlorobenzene, mesitylene, and tetralin. Images were taken with a Basler acA 1300gc camera (lens focal length: 200mm) at 2x magnification. Image section: 6x4mm.
  • the substrate was photographic paper. Within a series of printed dots, an individual pattern of height shifts, defects, and omissions is evident at a lower magnification than in Figure 4 a.

Landscapes

  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
  • Luminescent Compositions (AREA)
  • Credit Cards Or The Like (AREA)

Claims (10)

  1. Méthode de marquage et d'identification de produits, qui contient les étapes suivantes :
    - mise à disposition d'une formulation d'encre, qui contient des nanocristaux inorganiques semiconducteurs, qui émettent sous excitation de photons un rayonnement se situant dans une gamme de 750-1800 nm, de préférence de 800 à 1400 nm, de préférence maximum de 850 nm à 1100 nm,
    - génération d'un code unique pour identification d'un produit,
    - impression de la formulation d'encre sur au moins une face de la surface du produit sous la forme de ce code unique,
    - balayage du produit imprimé avec la formulation d'encre pour excitation avec une lumière bleue ou blanche,
    - détection du rayonnement émis par le produit balayé dans une gamme se situant de 750-1800 nm, de préférence de 800 à 1400 nm, de préférence maximum de 850 nm à 1100 nm.
  2. Méthode selon la revendication 1, qui contient en plus les étapes suivantes :
    - mémorisation du code unique dans au moins une banque de données,
    - interrogation du code unique détecté à partir d'au moins une banque de données pour vérification du produit.
  3. Méthode selon la revendication 1 ou 2, sachant que la formulation de l'encre est imprimée en plus sur au moins une face de la surface d'un groupe d'emballage, qui contient le produit, par exemple choisi à partir de liasses, de suremballage, de palettes, sous la forme du code unique et/ou sur des étiquettes de produit (étiquettes), cartes à code barres et étiquettes à code barres sous la forme du code unique.
  4. Méthode selon l'une quelconque des revendications précédentes, sachant que pour générer le code unique au moins une valeur de référence du produit est codifiée à l'aide d'un code unique.
  5. Méthode selon l'une quelconque des revendications précédentes, sachant que le code unique contient un code unidimensionnel, un code bidimensionnel ou un code tridimensionnel et/ou un ou plusieurs motifs, comme par exemple des surfaces, des rayures, des lignes, des figures géométriques, comme des cercles, des triangles, des rectangles, des polygones etc., des signes alphanumériques, ou des combinaisons de ceux-ci.
  6. Méthode selon l'une quelconque des revendications précédentes, sachant que le code unique est généré par les imprécisions d'impression et défauts d'impression pendant l'étape de procédé de l'impression de la formulation d'encre sur au moins une face de la surface du produit.
  7. Méthode selon l'une quelconque des revendications précédentes, sachant que pour balayer et/ou détecter, on utilise un terminal, comme par ex. : un téléphone multifonction ou une tablette.
  8. Méthode selon l'une quelconque des revendications précédentes, sachant que les nanocristaux inorganiques semiconducteurs sont choisis à partir du groupe des pérovskites, des semiconducteurs I-VI, des semiconducteurs II-VI, des semiconducteurs III-V, des semiconducteurs IV-VI, des semiconducteurs I-III-VI, de points de carbone et de mélanges de ceux-ci.
  9. Méthode selon l'une quelconque des revendications précédentes, sachant que la formulation de l'encre contient des nanocristaux inorganiques semiconducteurs, qui possèdent au moins en commun l'une ou toutes les propriétés suivantes : longueur d'ondes d'émission, répartition d'émission, maximum d'émission ou contient des mélanges de nanocristaux inorganiques semiconducteurs, qui ont des valeurs différentes concernant la longueur d'ondes d'émission, la répartition d'émission et le maximum d'émission.
  10. Méthode selon l'une quelconque des revendications précédentes, sachant que le rayonnement émis fournit un spectre fluorescent individuel, qui est mémorisé au moins dans une banque de données.
EP20780186.1A 2019-10-17 2020-09-24 Methode de marquage et identification de produits Active EP4045330B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019216003.4A DE102019216003B4 (de) 2019-10-17 2019-10-17 Optisches Sicherheitsmerkmal geeignet für Track & Trace- und/oder Serialisierungssysteme
PCT/EP2020/076720 WO2021073848A1 (fr) 2019-10-17 2020-09-24 Caractéristique de sécurité optique appropriée pour systèmes de suivi et/ou de sérialisation

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EP4045330C0 (fr) 2025-07-30
US20240051327A1 (en) 2024-02-15
JP2022552960A (ja) 2022-12-21
WO2021073848A1 (fr) 2021-04-22
JP7387889B2 (ja) 2023-11-28
DE102019216003A1 (de) 2021-04-22
EP4045330A1 (fr) 2022-08-24
DE102019216003B4 (de) 2022-04-07

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