Classifications

• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
  • G06T1/00—General purpose image data processing
  • G06T1/0021—Image watermarking
  • G06T1/0042—Fragile watermarking, e.g. so as to detect tampering
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
  • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
  • D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
  • D21H21/44—Latent security elements, i.e. detectable or becoming apparent only by use of special verification or tampering devices or methods
  • D21H21/46—Elements suited for chemical verification or impeding chemical tampering, e.g. by use of eradicators
• • 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
• • 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
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
  • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
  • D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
  • D21H21/44—Latent security elements, i.e. detectable or becoming apparent only by use of special verification or tampering devices or methods
  • D21H21/48—Elements suited for physical verification, e.g. by irradiation
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
  • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
  • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
  • G01N21/64—Fluorescence; Phosphorescence
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
  • G01N29/04—Analysing solids
  • G01N29/041—Analysing solids on the surface of the material, e.g. using Lamb, Rayleigh or shear waves
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
  • G01N33/34—Paper
  • G01N33/346—Paper sheets
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N2201/00—Features of devices classified in G01N21/00
  • G01N2201/06—Illumination; Optics
  • G01N2201/062—LED's
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N2291/00—Indexing codes associated with group G01N29/00
  • G01N2291/02—Indexing codes associated with the analysed material
  • G01N2291/023—Solids
  • G01N2291/0237—Thin materials, e.g. paper, membranes, thin films
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
  • G06T2201/00—General purpose image data processing
  • G06T2201/005—Image watermarking
  • G06T2201/0201—Image watermarking whereby only tamper or origin are detected and no embedding takes place
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer

Definitions

• This application relates to a new security substrate and a new means for authentication and to highlight falsifications or tampering attempts made on documents sheet or self-adhesive complexes, such as labels or visas. Falsification or attempts to falsify these documents or complexes are generally carried out by etching with so-called solvents
• the solvent reagents used in the check papers may be incorporated into these data-sheet security papers and may show tampering or attempt to detach the protective film with apolar solvents.
• these apolar solvent reagents for example based on anthraquinone, have the disadvantage of reacting over time with the pressure-sensitive or heat-sealable adhesive compositions used for bonding the protective films on the paper of the page of passport data.
• the apolar solvent reactants react with residual solvents, plasticizers, tackifiers, wetting agents and monomers present in the adhesive compositions and may cause premature coloration of the passport data page while it does not. there was no attempt to falsify.
• the security paper base also receives a layer of adhesive, for example by means of a permanent pressure-sensitive adhesive of acrylic nature, and is then applied after personalization.
• a layer of adhesive for example by means of a permanent pressure-sensitive adhesive of acrylic nature
• Falsifiers are also made to attempt to take off these visas or labels, to reuse them fraudulently, this with the aid of pure solvents or commercial products formulated based on solvents, such as for example a tag remover based of alkanes known under the name of "Rmover Label" ...
• the solvents used for this purpose are especially apolar solvents such as toluene, ethyl acetate, trichlorethylene.
• apolar solvents such as toluene, ethyl acetate, trichlorethylene.
• Document FR2675742 discloses a security document comprising a substrate and its protective film which is covered with a layer transparent adhesive. An impression is made between the substrate and the adhesive layer with an ink containing a hydrocarbon soluble dye. In case of an attempt to etch the adhesive layer to peel off the film by means of a hydrocarbon, a dissolution of the printing dye occurs and stains the film and the substrate thus revealing the attempt to falsify.
• such printed inks also have the major disadvantage of reacting in time with the adhesive layer of the protective film so that they wrongly reveal an attempt to falsify.
• the invention aims to solve the disadvantages of the prior art by proposing a new means for performing both the authentication of a security document and the detection of forgery or attempts to falsify.
• the invention therefore relates to printable security substrates, of cellulose base and / or polymer, for single-layer sheet documents, such as for example an inner page of a passport or for multi-layer sheet documents, such as for example identification or for self-adhesive complexes of the visa or security label type, these substrates comprising individualized particles enabling said substrate to be authenticated while being able to demonstrate tampering or attempted tampering with the solvents without using the solvent reactants, such as soluble water-insoluble dyes or pigments of the prior art .
• the cellulosic and / or polymer base safety substrates according to the invention can be prepared as a sheet on a paper machine from a fibrous suspension, or by (co) extrusion and / or bi-stretching of a structure. in synthetic material, in particular based on polyolefin, for example polyethylene.
• the present invention is particularly intended to make authenticatable security documents in contact with adhesives such as passport data pages and visas, while making them more difficult to falsify at the variable mentions or to take off the support on which they have been applied for the purpose of a fraudulent reuse of the latter, by means of individualized particles which make it possible at the same time to bring an increased evidence of attempts of falsification to the solvents, that this falsification is carried out with the key or by soaking and also to authenticate the security document.
• adhesives such as passport data pages and visas
• the object of the present invention is achieved by proposing a security substrate comprising at least one authentication zone and / or highlighting attempts to falsify by solvents, especially apolar solvents, characterized in that said zone comprises particles individualized polymer base or copolymer comprising at least one marker and in that said polymer or copolymer is at least partially soluble in the falsification solvents.
• the individualized particles of polymer base or copolymer of the secure substrate comprising at least one marker according to the invention do not comprise substances capable of interacting with the adhesive compositions.
• the individualized particles of polymer or copolymer base do not include compounds based in particular anthraquinone capable of reacting in time with residual plasticizers, tackifiers, wetting agents and / or monomers present in the compositions of the present invention.
• adhesive especially pressure-sensitive or heat-sealable adhesives which may be in contact with the substrate.
• the authentication and / or highlighting of forgery attempts zone may correspond only to a portion of the substrate, for example that on which the variable mentions are listed, so as to limit costs.
• the authentication zone and / or highlight forgery attempts may correspond to the entire surface of the substrate so that any attempt to falsify is detected.
• Integral part of the security substrate is understood to mean a portion which shares with the rest of the substrate structuring components, ie fibers for the cellulosic base substrates and synthetic materials, for example (co) -extruded and / or bi-stretched, for polymer base substrates.
• the authentication and / or highlighting of forgery attempts zone does not include or does not correspond to a scratch-removable layer masking printed information.
• the zone of detection of attempts of falsification by the solvents is arranged in mass and / or on the surface of the security substrate.
• the individualized particles can be mixed with papermaking fibers.
• the individualized particles may not be coated in a latex.
• the authentication zone and / or highlight tamper attempts does not mask printed information, unlike for example a scratch removal layer.
• the individualized particles may be directly dispersed in the mass of the substrate or one of the jets of the substrate and / or applied to the surface of the substrate by a coating, coating, impregnation or printing process. which allows both to authenticate the substrate and to highlight an attempt to falsify by a solvent attack via the surface of the substrate or via the edge of the security document regardless of the attack zone.
• These individualized particles of polymer or copolymer base comprising at least one marker can also be introduced into the substrate via intermediate carriers such as security elements such as strips of paper or polymer, security threads, small fragments of paper or plastic material said boards, wherein said individualized particles have been previously incorporated.
• the individualized particles comprise a single type of polymer or a mixture of polymers of different solubilities in falsification solvents.
• the individualized particles comprise polymers of polystyrene, polycarbonate, polyvinyl acetate, and / or other polymers soluble in solvents, in particular in toluene, ethyl acetate or trichlorethylene, which are widely used for falsification. printouts on the substrate or label peeling.
• the individualized particles according to the invention consist of a matrix based on polymer.
• polymer is meant a homopolymer, a copolymer or a mixture of polymers of different natures having a chemical solubility in the solvents usually used for forgery or fraudulent re-use of documents.
• the individualized particles may for example consist of a mixture of several polymers known to be soluble in different falsification solvents.
• the selected polymers will preferably be polystyrene, polycarbonate and polyvinyl acetate which solubilize in apolar solvents such as toluene widely used for detachment of protective films and labels.
• polar solvents of the alcohol type such as methanol, ethanol, etc. ketones such as acetone, esters such as ethyl acetate, halogens such as dichloromethane, amines and apolar solvents, in particular hydrocarbon solvents, of the aliphatic type such as hexane, heptane ... aromatics such as toluene, mineral spirits known under the name of "white spirit", etc.
• the individualized polymer base particles used in the substrate according to the invention may have different shapes or sizes.
• the security substrate will be introduced in particular and / or on the surface of the security substrate in the form of grains, solid or hollow spheres, fibers, disks, slats or needles.
• the individualized particles of polymer base can be functionalized with carboxyl functions, amino, hydroxyl, sulfates ... to promote their attachment in the substrate.
• the individualized particles have a uniform or dispersed size distribution.
• the individual particles in the form of lamellae or needles preferably have a larger dimension of less than 200 ⁇ and the individualized particles in the form of a sphere preferably have a mean diameter of between 1 and 200 ⁇ , so as to solubilize rapidly in the solvents used by falsifiers.
• a mean diameter of between 1 and 200 ⁇ so as to solubilize rapidly in the solvents used by falsifiers.
• the invention extends to a method of authenticating the security substrate or a security document including said substrate, comprising the steps of:
• individualized particles of polymer or copolymer base comprising at least one marker, said polymer or copolymer being at least partially soluble in the falsification solvents, said marker being visible or detectable, a visible marker being in particular iridescent, luminescent, fluorescent, phosphorescent , a photochromic, thermochromic, a visible marker is visible especially under excitation by UV radiation, visible or infrared or by means of a specific optics, a detectable marker having in particular electrical, magnetic or electromagnetic properties, and in particular detectable under excitation by a visible or infrared electromagnetic radiation, radiofrequency vibration or ultrasonic frequency, and
• the marker is visible or detectable it means that the security substrate or the security document is authentic.
• the security substrate or the security document is a forgery. that is, it is not genuine or has been falsified in solvents.
• the markers according to the invention can be authenticatable in different ways:
• a detector capable of detecting a specific property of the marker, for example a magnetic, electromagnetic, electric property, for example detectable under excitation by visible or infrared electromagnetic radiation, radio frequency vibration or at an ultrasonic frequency
• markers visible to the naked eye under daylight and without accessories, mention may be made of iridescent pigments, colored particles, liquid crystal polymers, liquid crystals, metal deposits, and elements with variable optical effects.
• thermochromic pigments examples include visible markers with a lamp-type or LED-type accessory ("Light Emitting Diode") with a suitable excitation wavelength UV (ultraviolet), visible or IR (infrared), mention may be made of luminescent, fluorescent, phosphorescent, photochromic dyes or pigments.
• UV ultraviolet
• IR infrared
• thermochromic pigments examples include thermochromic pigments.
• markers with magnetic properties such as certain alloys, ferromagnetic with properties of soft or hard magnetism, electromagnetic properties, markers with luminescent properties in the UV, visible, IR, markers with electrical property including conductive markers detectable by a radio frequency vibration or ultrasound.
• the marker is contained inside and / or arranged on the surface of the individualized particles of polymer and / or mixed with the polymer or copolymer constituting said particle.
• a hollow sphere-shaped particle may contain a marker on the surface of the sphere, in its envelope, and / or inside the sphere.
• the markers may be included in the particle by a grafting, coating, encapsulation or aggregation process. Alternatively, the markers may be placed on the surface of the particle by an adsorption or dyeing process on individualized particles. Finally, the markers can be mixed in mass with the polymer material before the step of individualization of the particles.
• the security substrate comprises both individualized first particles of polymer or copolymer base comprising at least a first marker allowing the authentication of said substrate, said polymer or copolymer is at least partially soluble in the falsification solvents and second individualized particles of polymer or copolymer base comprising at least a second marker, which may be different from the first, also allowing the authentication of said substrate, said polymer or copolymer of said second particles being not soluble in falsification solvents.
• the invention extends to a security document comprising the substrate security and including including other security elements that do not take the form of individualized particles of polymer base comprising a marker.
• the document may in particular comprise other authentication and tampering security elements used alone or in combination, for example:
• liquid crystal pigments in particular in printed or coated form
• a flat and relatively small security element such as a board
• a flat security wire in particular metallized or holographic with potentially demetallised zones forming a pattern or text
• a hot or cold rolled plane track in particular metallized, holographic with demetallized zones forming a pattern or text.
• the invention also extends to a security document including the security substrate and comprising an adhesive layer such as a visa or a security label.
• the invention further extends to a method of demonstrating forgery of a security substrate or document comprising said security substrate, comprising the steps of:
• first individualized particles of polymer or copolymer base comprising at least a first marker, said polymer or copolymer being at least partially soluble in falsification solvents, said first marker being visible or detectable, a marker visible being especially colored, iridescent, luminescent, fluorescent, phosphorescent, photochromic, thermochromic, a visible marker is in particular visible under excitation by UV radiation, visible or infrared or by means of a specific optics, a detectable marker having particular electrical properties , magnetic or electromagnetic, and in particular detectable under excitation by a UV, visible or IR electromagnetic radiation, a radio frequency vibration or at an ultrasonic frequency, and
• the detection of forgery is not related to the appearance of colored spots on the substrate due to a solubilization of reagents solvato solubles but is related to the disappearance of said individualized particles that will no longer be visible to the naked eye with or without the aid of an accessory or more detectable with the appropriate detection system thus indicating that there has been forgery or attempt to falsify in one or more solvents.
• the detection of the forgery attempt is based on the fact that, following the contact of said safety substrate with solvents used by the falsifiers, the individualized polymer base particles present in and / or on the surface of this substrate are partially or completely solubilized and that the markers they contain in mass or on surface will have diffused in the substrate or have migrated into the falsification solvent.
• the absence of marked individualized particles or their modification of shape, color, property, for example fluorescence will characterize the fraud.
• the absence of marked individualized particles if no other element makes it possible to authenticate the document, the absence of marked individualized particles may also be linked to the fact that the document is not authentic and no longer to a document. falsification of the document.
• the authentication method according to the invention further comprises the steps of:
• second individualized particles of polymer or copolymer base comprising at least a second marker, said polymer or copolymer of said second individualized particles being insoluble in the falsification solvents and said second marker being visible or detectable,
• the substrate or the document is necessarily authentic since the second marker is visible or detectable.
• the first marker is invisible or undetectable and the second marker is visible or detectable on or in the security substrate or security document comprising said substrate, it can be concluded that the substrate or document has been falsified in the solvents but that it is authentic.
• the second marker is invisible or undetectable, regardless of the state of the first marker, on or in the security substrate or the security document comprising said substrate, it can be concluded that the substrate or the document is not not authentic but it is a fake.
• first and second markers are visible or detectable on or in the security substrate or the security document comprising said substrate, it can be concluded that the substrate or the document is authentic and has not been tampered with .
• the invention also extends to a method of manufacturing a security substrate or a security document, characterized in that it comprises: a step of introducing the individualized particles of polymer or copolymer base comprising at least one marker into the mass of the substrate or of the document, and / or
• the manufacturing method according to the invention comprises a step of randomly dispersing said individualized particles of polymer or copolymer base comprising at least one marker in a fibrous suspension before or during a sheet formation. on a paper machine of said substrate so as to randomly mass introduce said individualized particles into the substrate or document.
• the manufacturing method according to the invention comprises a step of randomly dispersing said individualized particles of polymer or copolymer base comprising at least one marker in an aqueous solution with or without addition of wetting agent and binder and to apply this strip mixture for example via a spray just after the formation of the sheet but before pressing on a paper machine of said substrate so as to introduce on the surface of the substrate or document, for example in the form of a strip, said individualized particles randomly distributed.
• the manufacturing method according to the invention comprises a step of randomly mixing said individualized particles of polymer or copolymer base comprising at least one marker to a structure of synthetic material, in particular based on polyethylene having voids or cavitations, optionally with mineral fillers, before co-extrusion and / or bi-stretching steps of said synthetic material structure and creating voids in the synthetic material structure with cavitations, or to be applied in surface of the substrate randomly said individualized particles of polymer or copolymer base comprising at least one marker to said structure of synthetic material, in particular based on polyethylene having voids, after steps co-extruding and / or bi-stretching said structure of synthetic material.
• the manufacturing method according to the invention comprises the following particular steps: placing an adhesive layer on the safety substrate and providing said structure made of polyethylene-based synthetic material having voids with a density less than 0.6 g / cm 3, and provide said structure of synthetic material so that it has a cohesive force of less than 4 Newtons.
• such a manufacturing method makes it possible to obtain a substrate or an adhesive security document whose density and the cohesive force of the frontal of synthetic material are such that any attempt at dry separation, that is to say without solvent, will cause tearing and / or at least partial delamination of the substrate or document thus revealing the attempt of falsification by mechanical detachment.
• individualized particles of polymer base and more particularly polystyrene spheres of 4 microns in diameter are synthesized and visible to the naked eye with the aid of a dedicated accessory.
• a specific luminescent marker excitable at certain wavelengths in the visible or UV and fluorescent in the visible is fixed on the polystyrene constituting the spheres to allow detection of these spheres normally invisible to the naked eye, using a detection system with adequate lighting, filters and magnification devices.
• These marked polystyrene spheres are introduced and dispersed in the paper pulp before sheet setting on the paper machine so as to obtain about ten spheres per cm 2 .
• the resulting security paper or substrate is then coated with an acrylic permanent pressure sensitive adhesive which is coated with a silicone protective film.
• Simulations of falsification and more particularly the release tests of these self-adhesive labels after 24 hours of application on a support are made by immersion etching during a few seconds of the adhesive paper applied on its support using solvents including toluene or trichlorethylene, very effective to take off the self-adhesive labels without destroying the front of the label.
• the adhesive labels peel off without any damage to their detection medium and can be glued to another support without showing any apparent evidence of falsification with the naked eye.
• the observation of the front face of the label with the appropriate detector shows that the spheres marked by luminescent markers and initially introduced into the paper of the front face of the label are no longer detectable, so there is good evidence of falsification or evidence that the substrate is not authentic.
• This example demonstrates the fraudulent reuse of an authentic visa-type adhesive paper that has been peeled off and stuck on another passport or the use of non-genuine adhesive paper.
• the individualized polymer base particles comprising the luminescent marker, initially present in the paper are no longer visible or more detected during the control of the document thereby highlighting the chemical fraud in the solvents. Indeed, polystyrene spheres with solubility in solvents such as toluene have been completely dissolved.
• the constituents of the acrylic adhesive do not react over time with the individualized particles of polymer base to reveal spots and lead to false detection attempts to falsification as is the case for the prior art.
• individualized fluorescent particles are produced in a fluidized bed under UV radiation at a wavelength of 365 nm of indefinite shape of a few hundred micrometers for their largest dimension from pigments. 3 to 5 micron powdered fluorescers aggregated with a low molecular weight latex binder having partial solubility in solvents.
• individualized fluorescent particles are introduced discretely and dispersed in the pulp, in mixing with flat elements of the type of safety boards visible to the naked eye but with an accessory, that is to say, fluorescent under UV radiation at 365 nm, before the formation of the sheet on the paper machine so as to to obtain a substrate or paper having an individualized particle density of the order of one hundred per cm 2 and a density of boards of the order of a few hundred per m 2 .
• Simulations of falsification and more particularly tests of falsification of the manual writings made with black permanent felt on this paper are made by chemical etching at the touch with a cotton swab soaked with solvent in particular keto type, very effective to erase this type of writing .
• the paper After a few gentle wet rubs, the paper no longer shows any trace of the written mentions and new mentions can be rewritten on the paper without showing any apparent evidence of falsification with the naked eye.
• the observation of the paper under a UV lamp at a wavelength of 365 nm shows that the individualized fluorescent particles no longer have their original shape and have diffused, whereas the small plates are still detected, characterizing an evidence of falsification on authentic security paper.
• the individualized fluorescent particles have been aggregated by means of a polymer having properties, after drying, of solubilization in the falsification solvents, so that in case of contact with these solvents the aggregates of fluorescent pigments are dissolved. and the pigments spread on the surface of the security sheet.
• This evidence of falsification can be detectable automatically by sorting machines comprising a 365 nm UV lighting module coupled to a CCD camera for acquiring the image which, once processed and analyzed, makes it possible to tell whether the two UV elements are detectable and have signal identical to the expected signal for an authentic document not falsified.
• individualized polystyrene and polyethylene particles are synthesized respectively in the form of spheres 15 microns in diameter visible to the naked eye but with an accessory.
• a specific luminescent marker excitable at certain wavelengths in the UV or visible and fluorescent in the visible and on the polyethylene spheres another specific luminescent marker always excitable in a range of lengths. wave of UV or visible and emitting at other wavelengths in the visible.
• These mixed spheres are normally invisible to the naked eye but visible with a detection accessory with adequate illumination, filters and magnification devices.
• spheres of polystyrene and polyethylene labeled are introduced and dispersed in a coating color which is then coated by air on one side of a synthetic support bi-stretched polyethylene, so as to obtain about fifteen individualized particles by cm 2 .
• the resulting synthetic safety substrate is then coated on its other side with a permanent pressure sensitive adhesive of acrylic type and covered with a silicone protector.
• Simulations of falsification and more particularly the release tests of these self-adhesive labels after 24 hours of application on a support are carried out by immersion etching for a few seconds of the adhesive label applied on its support using toluene-type solvents in particular. or trichlorethylene, very effective to take off self-adhesive labels without destroying the front of the label.
• the adhesive labels peel off without any damage to their support and can be glued to another support without showing any apparent evidence of falsification with the naked eye.
• the observation of the front of the label with the appropriate accessory shows that the marked polystyrene spheres do not are more visible while labeled polyethylene spheres are, so there is evidence of chemical forgery on an authentic secure substrate. Indeed, the first polystyrene spheres are soluble in falsification solvents while the second spheres in polyethylene are not.
• individualized polystyrene particles are synthesized in the form of hollow spheres whose average diameter after sorting is of the order of 100 ⁇ .
• a marker excitable by UV radiation and emitting a fluorescent light in the blue is encapsulated in these spheres.
• These marked polystyrene spheres are introduced and dispersed in the paper pulp before it is sheet-fed on the paper machine so as to obtain a paper having an individualized particle density of the order of one hundred per cm 2 .
• the security paper obtained is then coated with a permanent pressure-sensitive adhesive of acrylic type.
• Simulations of falsification and more particularly the release tests of these self-adhesive labels after 24 hours of application on a support are carried out by immersion etching for a few seconds of the adhesive label applied on its support using toluene-type solvents in particular. or trichlorethylene, very effective to take off self-adhesive labels without destroying the front of the label.
• the adhesive labels After 30 seconds of soaking in toluene, the adhesive labels are peeled without any damage to their support and can be glued on another support. Nevertheless, after the attempt of falsification, under excitation with UV radiation, the fluorescence of the particles will appear diffusely in the security substrate
• individual spherical particles of a few tens of micrometers in diameter made up of solid balls composed of a first polymer that is not soluble in solvents and coated with a layer of a polymer, are manufactured.
• second polymer soluble in solvents and more particularly polyethylene balls with polystyrene coating.
• a first fluorescent label is mixed with the core polymer of the particle and emits red fluorescence under UV excitation at 365 nm and a second fluorescent label is introduced into the polystyrene coating, constituting the outside of the particle, and emits a blue fluorescence under UV excitation at 365 nm.
• the interface between the polystyrene coating of the particle and the solid polyethylene ball includes a 365 nm UV filtering substance, so that the fluorescence of the first marker is not visible when the outer coating of the particle is not damaged, only the fluorescence of the second marker being observable under excitation
• individualized spherical fluorescent particles are introduced in a discrete manner and dispersed in the paper pulp, before it is placed on the paper machine to obtain a substrate or paper having an individualized particle density of about one hundred by cm 2 .
• Simulations of falsification and more particularly tests of falsification of the manual writings made with black permanent felt on this paper are made by chemical etching at the touch with a cotton swab soaked with solvent in particular keto type, very effective to erase this type of writing .
• the paper After a few gentle wet rubs, the paper no longer shows any trace of the written mentions and new mentions can be rewritten on the paper without showing any apparent evidence of falsification with the naked eye.
• the observation of the paper under a UV lamp at a wavelength of 365 nm and with a magnification device shows a fluorescence different from the individualized particles, characterizing an evidence of forgery on an authentic security paper.
• safety boards are produced which are visible to the naked eye under UV excitation at 365 nm, comprising a written mention formed by individualized particles of polymer base and red fluorescers under UV excitation 365 nm. on a yellow fluorescent background under this same excitation.
• the fluorescent background and the written mention formed by the fluorescent particles are applied to the support of the boards by heliographic printing.
• the individualized particles are more particularly polystyrene beads with a fluorescent marker, visible to the naked eye under UV with a magnifying accessory.
• These fluorescent planchettes are introduced discretely dispersed in the pulp prior to sheeting on the paper machine so as to obtain a substrate having a paper or boards density of the order of several hundreds m 2.
• the paper or security substrate obtained is then coated on one of its faces with a permanent pressure-sensitive adhesive of the acrylic type, then covered with a silicone protective film.
• Falsification simulations and more particularly tests of release of these self-adhesive labels after 24 hours of application on a support are carried out by immersion etching for a few seconds of the adhesive paper applied on its final support using toluene-type solvents, or trichlorethylene, very effective to take off self-adhesive labels without destroying the front of the label.
• the adhesive labels are peeled off without any damage to their detection medium and may be glued to another support without showing any apparent evidence of falsification with the naked eye.
• the observation of the front face of the label under UV excitation at 365 nm shows that the fluorescent boards initially introduced into the paper no longer exhibit the red fluorescence of the individualized particles constituting the written mention, only the yellow fluorescent background being observable proving that the document was falsified.
• This example makes it possible to demonstrate the fraudulent reuse of an authentic adhesive-type paper of the visa type which would have been taken off and stuck on another passport.
• the polystyrene beads were dissolved in the solvent used for the detachment of the label resulting in the red fluorescent marker which is no longer visible under UV excitation 365 nm.
• paramagnetic microspheres with a diameter of 0.9 to 1.8 microns with iron oxide encapsulated in the polystyrene spheres functionalized with carboxylic functions are manufactured to prevent the problems of agglomeration.
• These magnetic individualized particles are introduced and dispersed in a coating color which is then coated by air on one side of a synthetic bi-stretched polyethylene support, so as to obtain about fifteen individualized particles per cm 2 .
• the resulting synthetic safety substrate is then coated on its other side with a permanent pressure sensitive adhesive of acrylic type and covered with a silicone protector.
• these magnetic individualized particles dispersed randomly on the surface of the substrate emit a magnetic signal that can be detected.
• Simulations of falsification and more particularly the release tests of these self-adhesive labels after 24 hours of application on a support are carried out by immersion etching for a few seconds of the adhesive label applied on its support using toluene-type solvents in particular. or trichlorethylene, very effective to take off self-adhesive labels without destroying the front of the label.
• the labels Adhesives come off without any damage from their support and can be glued to another support without showing any apparent evidence of falsification with the naked eye.
• the detection of the magnetic signal by means of the dedicated detection system shows a different response of the magnetic pigments with respect to the magnetic signal of the polymer-based magnetic individualized particles before falsification. This variation of the signal thus proves that there has been chemical falsification on an authentic substrate.

Landscapes

• Health & Medical Sciences (AREA)
• Physics & Mathematics (AREA)
• Life Sciences & Earth Sciences (AREA)
• Chemical & Material Sciences (AREA)
• General Physics & Mathematics (AREA)
• Pathology (AREA)
• Engineering & Computer Science (AREA)
• Analytical Chemistry (AREA)
• Biochemistry (AREA)
• General Health & Medical Sciences (AREA)
• Immunology (AREA)
• Food Science & Technology (AREA)
• Medicinal Chemistry (AREA)
• Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
• Acoustics & Sound (AREA)
• Theoretical Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Paper (AREA)
• Credit Cards Or The Like (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=46880757

Family Applications (1)

Country Status (4)

Families Citing this family (2)

Family Cites Families (13)

• 2011
  • 2011-07-29 FR FR1102391A patent/FR2978461A1/fr not_active Withdrawn
• 2012
  • 2012-07-25 EP EP12761663.9A patent/EP2737130A1/de not_active Withdrawn
  • 2012-07-25 WO PCT/IB2012/053799 patent/WO2013017996A1/fr active Application Filing
  • 2012-07-25 US US14/235,778 patent/US20150027218A1/en not_active Abandoned

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events