EP3060408B1 - Procédé de formation d'au moins une structure tridimensionnelle sur au moins une surface d'un substrat et pellicule de transfert - Google Patents

Procédé de formation d'au moins une structure tridimensionnelle sur au moins une surface d'un substrat et pellicule de transfert Download PDF

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Publication number
EP3060408B1
EP3060408B1 EP14786203.1A EP14786203A EP3060408B1 EP 3060408 B1 EP3060408 B1 EP 3060408B1 EP 14786203 A EP14786203 A EP 14786203A EP 3060408 B1 EP3060408 B1 EP 3060408B1
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EP
European Patent Office
Prior art keywords
film
substrate
film element
forming
forming material
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EP14786203.1A
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German (de)
English (en)
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EP3060408A1 (fr
Inventor
Franziska Peinze
Olga Kulikovska
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Bundesdruckerei GmbH
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Bundesdruckerei GmbH
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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

Definitions

  • the present invention relates to a method for forming at least one three-dimensional structure on at least one surface of a substrate, in particular a value or security product or a precursor of a valuable or security product.
  • value or security documents may be, for example, a personal document, a check card, a non-personalized authorization card, such as a ticket or a means of payment, or a value or security element intended for product assurance.
  • Value or security products serve to verify the identity of a person or thing or a claim, for example, for payment of a sum of money or for the issue of a product or service.
  • the product therefore contains security features whose imitation is extremely difficult or even practically impossible.
  • the product such as banknotes, consists of a not readily available material.
  • security features may be formed by special colors, for example luminescent or optically variable colors, optical elements such as holograms, tilt images, kinegrams, lens or prism arrays, also guilloches, mottling fibers, security threads and others.
  • the value or security documents are easy to produce and that they can be detected by visually impaired persons.
  • DE 33 14 327 C1 discloses a method of making a badge with highly stamped customer related data.
  • EP 2 161 314 B1 For example, a method of generating an authentication mark on a recording medium is described.
  • a marking material is first applied to an intermediate transfer element in an image area, so that a marking material image is produced.
  • the marking material is one ultraviolet curable phase change ink composition.
  • a predetermined amount of additional marking material is applied to the authenticating image area to increase the amount of marking material.
  • the applied marking material is transferred from the intermediate transfer member to the recording medium.
  • the marking material is cured on the recording medium so that the fixed marking material forms a tactually perceptible authentication mark.
  • a system for producing tactile structures on printed products specified is used with multiple printing units.
  • To create the tactile structures are on the signatures by radiation expandable pressure layers (bulking colors or paints), which is acted upon by means of laser marking devices.
  • a film printing method in which firstly the surface of the substrate to be printed is provided with an adhesive layer at the locations provided for printing, before a transfer film composed of a carrier film and a transfer layer adhering thereto via a release layer is placed under pressure on the substrate, and in which the transfer film adheres partially or flatly to the substrate.
  • the substrate with the transfer layer thereon is exposed in a process step following the film support to a contact pressure which substantially exceeds the pressure during the film application.
  • EP 1 897 700 A2 there is provided a hot embossing method in which a transfer sheet of a support sheet is provided with a release liner on which a thin thermoplastic resin, then an aluminum sheet and thereon an adhesive layer are disposed.
  • the transfer film is transferred to a substrate, for example a banknote.
  • the transmission is limited to the range of pressure transmission by means of a pressure plate.
  • the carrier layer with the non-transferred film components is removed again.
  • a security sticker from a stamping foil is in DE 10 2007 005 416 A1 specified. This sticker is also partially transferred by means of a stamp on a substrate.
  • the present invention has for its object to provide a method for forming three-dimensional structures, which in particular should be palpable / felt, the is easy to carry out and that allows to achieve a sufficient fineness of the structures to be formed.
  • the palpable structure should preferably be produced on a value or security document formed of polycarbonate or containing this material, in particular a polycarbonate card.
  • the above objects are achieved according to the present invention with the method of forming at least one three-dimensional structure on at least one surface of a substrate.
  • the invention is particularly suitable for producing tactile structures on a value or security product.
  • the value or security product may be a value or security document or security element, i. an element which is connected, for example, with an object to be protected against counterfeiting, forgery or falsification, for example a sticker, label or the like.
  • value or security product includes, for example, a passport, identity card, driver's license or another ID card or an access control card, a vehicle registration document, vehicle registration document, visa, check, Means of payment, in particular a banknote, a check, bank, credit or cash card, customer card, health card, chip card, a company card, proof of entitlement, membership card, gift or shopping voucher, bill of lading or other proof of entitlement, tax stamp, postage stamp, ticket, ( Saint -) To identify a token, adhesive label (for example for product protection) or another ID document.
  • Such products are value or security documents.
  • a product according to the invention is also a security element (transfer element) to understand that has a security feature according to the present invention and that can be permanently connected to an object to be protected, such as a sticker, label or the like.
  • the product may be, for example, a smart card.
  • the security or value document may be in ID 1, ID 2, ID 3, or any other format, such as a booklet form, such as a passport-like item.
  • the value or security product is generally a laminate of several document layers, which are connected in register under the influence of heat and under increased pressure. These products should meet the standardized requirements, for example ISO 10373, ISO / IEC 7810, ISO 14443.
  • the product layers consist, for example, of a carrier material which is suitable for lamination.
  • the value or security product can be formed from a polymer selected from a group comprising polycarbonate (PC), in particular bisphenol A polycarbonate or a polycarbonate, formed on the basis of a geminally disubstituted Dihydroxydiphenylcycloalkane, polyethylene terephthalate (PET), its derivatives such as glycol-modified PET (PETG), polyethylene naphthalate (PEN), polyvinyl chloride (PVC), polyvinyl butyral (PVB), polymethyl methacrylate (PMMA), polyimide (PI), polyvinyl alcohol (PVA), polystyrene (PS ), Polyvinylphenol (PVP), polypropylene (PP), polyethylene (PE), thermoplastic elastomers (TPE), in particular thermoplastic polyurethane (TPU), acrylonitrile-butadiene-styrene copolymer (ABS) and derivatives thereof, and / or paper and / or cardboard and / or glass and / or metal
  • the product can also be made of several of these materials. It preferably consists of PC or PC / TPU / PC.
  • the polymers may be either filled or unfilled. In the latter case they are preferably transparent or translucent. If the polymers are filled, they are opaque.
  • the above information relates both to films to be joined together and to liquid formulations applied to a precursor, such as a protective or topcoat.
  • the product is preferably prepared from 3 to 12, preferably 4 to 10, films.
  • the films may also carry print layers. A laminate formed in this way can finally be coated on one or both sides with the protective or topcoat or with a film.
  • the film may be a volume hologram, a film with a surface hologram (for example a kinegraphic element) or a scratch-resistant film.
  • Overlay layers formed in this way protect a security feature arranged underneath and / or give the document the required abrasion resistance.
  • the term "pattern" is to be understood as meaning a somewhat distributed distribution of tactile impression-imparting elements on one or more surfaces, resulting in a self-contained representation, for example Image, picture element, characters, including Braille, in particular Braille, or an alphanumeric character, symbol, crest, line, formula or the like.
  • the pattern is formed by the claimed three-dimensional structures.
  • the structures may additionally give an optical impression, in particular if they have a contrasting color, including black, gray or white, to the color of the substrate in the region of the elevations or depressions of the substrate.
  • the material forming the three-dimensional structures is colored by means of customary colors (dyes, pigments).
  • the term 'pattern element' is called, it is to be understood as a component / element of a pattern, wherein the pattern elements can be separated from each other or merge seamlessly into each other.
  • a pattern element serves as the smallest structural element for forming the pattern, with all pattern elements forming the pattern.
  • the pattern element is a three-dimensional structure in the form of a raised or indentation on a substrate surface.
  • the pattern elements when separated from each other, may each have a circular (dot-shaped), rectangular, square, hexagonal or other shape and a size / diameter of, for example, 1 to 100 ⁇ m.
  • the pattern elements can also merge into each other, so that no regular structural elements are formed.
  • a Braille character corresponding to an alphanumeric character may represent a pattern, while the individual character elements constituting a Braille character in the known 3x2 matrix each form a pattern element.
  • pattern elements which are typically arranged regularly, for example in lines or in another regular arrangement
  • the pattern elements may be arranged, for example, in a honeycomb arrangement or in a row arrangement with pattern elements offset from one another or not offset from one another.
  • the at least one film element forms the at least one three-dimensional structure on the at least one surface of the substrate.
  • the above process steps may all take place simultaneously, or some of these process steps may be performed simultaneously and others in succession, or all process steps may be performed sequentially. If some or all of the process steps are performed one after the other, then in one of many ways of successive steps they may occur in sequence in a particular order.
  • the method steps (b) mechanical separation of at least one film element of film subregions that do not correspond to the at least one film element
  • (c) in one of many ways of successive steps they may occur in sequence in a particular order.
  • the method steps (b) mechanical separation of at least one film element of film subregions that do not correspond to the at least one film element
  • (c) in one of many ways of successive steps they may occur in sequence in a particular order.
  • the method steps (b) mechanical separation of at least one film element of film subregions that do not correspond to the at least one film element
  • (c) in one of many ways of successive steps they may occur in sequence in a particular order.
  • the method steps (b) mechanical separation of at least one film element
  • the method steps (b) and (c) after the provision of the substrate and the structure-forming film (method step (a)) but also take place sequentially and that by first the film element is mechanically separated from the film member not corresponding film portions (method step (b )) and this separated film element is then inextricably bonded to the substrate surface in the adhesion region (process step (c)). If at least some of the mentioned method steps are carried out successively, they are preferably run through in the above-mentioned order.
  • the three-dimensional structure forms a security feature on the value or security product.
  • This security feature can be tactile. But there is also the possibility that it is not tactile. If it is palpable, it must have a minimum height.
  • the height may be at least about 30 ⁇ m, more preferably at least 100 ⁇ m, most preferably at least 300 microns, amount.
  • the security feature is not higher than a few millimeters, for example not higher than 3 mm, preferably not higher than 2 mm, more preferably not higher than 1 mm and most preferably not higher than 750 ⁇ m. In this case, a person can feel the structure.
  • the structure may be in the form of braille, in particular braille.
  • tactile structures with a different coding, for example a regular pattern or a certain roughness in the form of unevenly (randomly) arranged structures. All of these structures allow a person to perceive the structure by palpation. If the three-dimensional structures are not palpable because they do not have sufficient height, for example about 150 ⁇ m, for the scanning against the substrate surface, they can be detected by machine, for example with a scanning device or optically by means of grazing illumination.
  • the method according to the invention is well suited, since it is very easy to carry out and does not require expensive and expensive materials and devices for applying the materials.
  • these are formed from the structure-forming material by completely transferring the material in the area to be transferred (adhesion area) to the substrate and fixing it there.
  • the fixation leads to a permanent connection of the transferred material element with the substrate surface.
  • a force is applied to the material element (pressure application, impact method) to impose it on the substrate surface.
  • the structure-forming film arranged between a tool and the substrate is completely transferred onto the substrate in the case according to the invention.
  • the process corresponds to a punching process in which the film element to be transferred is punched out of the structure-forming film (ie completely removed) and transferred to the substrate. This enables a very precise generation even of very small film elements, which are placed on a precisely positioned position on the substrate and connected there with it inseparably.
  • the process is consequently fast, since the structural height required for the production of tactile three-dimensional structures is achieved by a simple choice of the film thickness suitable for this purpose.
  • the material will regardless of the target height of the structure, it is preferable to transfer it to the substrate surface in one step, although it is also possible to build a second structure having a second height thereon after creating a first structure having a first height thereon, the first height and the second height being equal or may be different to either increase the feature height or to create a more complex structure. It is therefore not necessary to use the structures as in the case of EP 2 161 314 B1 to build successive process described.
  • An advantage over an embossing method is also that even sensitive substrates can be easily provided with the three-dimensional structures: For example, it would not be possible with a stamping process, a value or security document that contains an internal electrical circuit, which may also include an electronic semiconductor device to structure with a stamping process. Because the circuit and in particular the electronic semiconductor device and their connections can be damaged or even destroyed in this process. By contrast, the process according to the invention is much gentler and does not affect these components.
  • the tool (s) used to transfer the film elements to the substrate may be configured to screen the film elements, ie, to punch and transfer them in small pattern elements. In this way, any three-dimensional patterns can be generated on the substrate. Therefore, it is possible to produce the three-dimensional structure not only in a single configuration for a larger totality of substrates common to all of these substrates but also to form an individual configuration of the three-dimensional structure for each individual substrate.
  • the three-dimensional structures can also be embodied in the form of individualizing, in particular personalizing, markings, ie in the form of markings that reproduce, for example, individualizing data of a person or a thing to which the value or security document is assigned.
  • the name or another characteristic of the person in plain text or in coded form may be displayed in three dimensions.
  • the three-dimensional pattern can encode information.
  • the three-dimensional marking can be represented by alphanumeric characters or, more preferably, in Braille, in particular Braille.
  • the three-dimensional structure can represent an authentication feature.
  • the three-dimensional structure may also be a verification or authentication feature.
  • the at least one film element in the non-detachable connection with the at least one surface of the substrate is in direct contact with the at least one surface of the substrate.
  • no adhesion promoter (adhesive) or any other additional substance is provided between the film element and the substrate surface for connection to the substrate.
  • the film itself has in this preferred embodiment of the invention, at least on the side no adhesion promoter, which is brought into contact with the substrate.
  • the film element comes in direct contact with the substrate surface.
  • the film element lies flat on the substrate surface after the transfer. The avoidance of additional material between the film element and the substrate surface allows inter alia a better and stronger connection of the film element on the substrate surface.
  • a monolithic connection is formed between the two connection partners, i. a connection in which the individual connection partners no longer exist separately after the connection has been formed, because the two connection partners are no longer separated by an interface.
  • Such an intimate connection is achieved in particular by a firm contact pressure of the film element on the substrate surface.
  • the at least one film element is non-releasably connected by local pressing in the at least one adhesion region to the at least one surface of the substrate and also by heating.
  • the structure-forming material is a thermoplastic material, so that it melts at least partially when heated.
  • the tool used for pressing and / or separating can also be used for the heating. The tool is supplied with heat, which then passes it on to the film element, or the tool is designed to generate the heat itself, for example via a resistance heater or an ultrasonic vibration device.
  • the film element may contain special absorber agents, in particular substances selectively absorbing in the infrared spectral range (thermosensitive substances). These are preferably located in a region in the structure-forming film or the film element, which is arranged adjacent to the contact side with the substrate surface.
  • the film element may first be brought into contact with the substrate surface and then the contacted film element may be heated and optionally additionally pressed onto the substrate surface. Before or subsequently, the film residue can be mechanically separated from the area of the structure-forming film corresponding to the film element. If the heating takes place by means of electromagnetic radiation, it can be passed through a contact pressure element.
  • the pressing element must be transparent / translucent for the electromagnetic radiation for this purpose.
  • the at least one film element is permanently connected in the at least one adhesion region by local application of a chemical agent which acts as a solvent or swelling agent for the structure-forming material of the structure-forming film and / or as a solvent or swelling agent for the substrate material.
  • a chemical agent which acts as a solvent or swelling agent for the structure-forming material of the structure-forming film and / or as a solvent or swelling agent for the substrate material.
  • this compound can be prepared by the chemical action on the contacted surfaces of the structure-forming film and the substrate.
  • the solvent or swelling agent can be matched to the film material and / or to the substrate material.
  • a polycarbonate-containing material is preferably used for the structure-forming film or the film is formed from a polycarbonate, can be used as a solvent or swelling agent one of in DE 10 2007 052 947 A1 specified solvents are used, which are specified there as a solvent for the existing based on a polycarbonate ink (corresponding to the specified there component B). Therefore, this document is hereby incorporated in full in the disclosure of the present application, but at least to the extent of the solvents mentioned there.
  • the following solvents or swelling agents are therefore used with particular preference: aliphatic, cycloaliphatic, aromatic hydrocarbons and liquid organic esters.
  • the solvent or swelling agent is applied by a tool to the film element, preferably when the latter is already in contact with the substrate surface. By solving or swelling of the film material, this connects in an excellent manner with the material of the substrate on the surface thereof.
  • the tool used to press the Foil element and / or for mechanically separating the film element from the rest of the structure-forming film may additionally be adapted to apply the solvent or swelling agent.
  • this tool has outlet openings for the chemical agent, for example nozzles, which are connected to a reservoir for the solvent or swelling agent.
  • the structure-forming material of the film has cavities which completely penetrate the film. These cavities are designed so that a solvent or swelling agent, which is applied to a film side, which is opposite to a contact side of the film with the at least one surface of the substrate, can pass through the film and reach the contact side of the film.
  • the cavities can be introduced during the production of the structure-forming film or only afterwards.
  • the film may be provided during extrusion with a blown material, the outgassing at elevated temperature and produces the cavities.
  • inorganic or organic materials which have a porosity may also be incorporated in the polymer material of the transfer film, for example silicon dioxide or aluminum oxide, which may be present in the form of nanoscale particles.
  • larger particles with correspondingly small cavities can be used, for example zeolites.
  • filled materials are exemplary in DE 10 2010 035 890 A1 specified.
  • This document shows a process for producing a microporous film. In this case, a particulate material is extruded into a film. The particles have defined cavities. It may be, for example, zeolites or fullerenes.
  • the cavities are formed only after the formation of the structure-forming film, they can be produced by perforation processes, for example by laser drilling (laser ablation, either thermally with a CO 2 laser or by photolytic decomposition of the polymer material with a UV (excimer) laser.
  • the film material may be porous.
  • the cavities may be formed by holes, depressions, cavities, channels, pores, recesses, cavities and the like.
  • the cavities have a size in the micrometer range, i. the diameter / thickness of the cavities is in the range from 1 ⁇ m to 1000 ⁇ m, preferably in the range from 1 ⁇ m to 500 ⁇ m and very particularly preferably in the range from 1 ⁇ m to 100 ⁇ m.
  • the cavities can also be smaller: their size can be, for example, at least 50 nm and more preferably at least 100 nm and a maximum of 1000 ⁇ m, more preferably a maximum of 500 ⁇ m and most preferably a maximum of 100 ⁇ m.
  • the structure-forming material according to a matrix (a grid) on the at least one surface of the substrate is connected pointwise inseparable, so that the film elements corresponding to these dot surfaces are transferred to the substrate surface. This makes it possible to form any three-dimensional structures on the substrate surface.
  • the structure-forming film has a thickness of 50 to 250 ⁇ m.
  • the film thickness can also be larger or smaller, that is to say for example at least 30 ⁇ m or at least 75 ⁇ m or at least 100 ⁇ m or at least 250 ⁇ m or at least 500 ⁇ m.
  • the film thickness can also be a maximum of 3000 ⁇ m or a maximum of 1000 ⁇ m or a maximum of 500 ⁇ m or a maximum of 250 ⁇ m or a maximum of 100 ⁇ m.
  • the maximum film thickness is essentially limited by the fact that arbitrarily thick film elements from the structure-forming Material can not be separated out with the desired fineness.
  • the structures made with such a film accordingly have the stated height. Structures formed with such a height are tangible.
  • the film has at least one dye or at least one pigment.
  • the dye or pigment may preferably be absorbing and / or luminescent in the visible spectral range.
  • the dye or the pigment can be in the film or as a layer, for example as a print layer, on the film.
  • the structure-forming film has regularly arranged thin regions, so that the at least one film element is mechanically separated along thin regions which surround the film element from film subregions which do not correspond to the at least one film element (the film residue).
  • the film element can be separated very easily and precisely from the rest of the structure-forming film because the thin areas represent desired separation points. Between the thin areas are raised areas.
  • the grid of the thin regions and the raised regions preferably extends over the entire surface of the structure-forming film.
  • the mechanical separation could be a problem, especially if the structure-forming film is relatively thick.
  • the thin areas allow the formation of a more regular edge profile of the film elements, because the film elements are separated along the thin areas acting as tear lines.
  • the thin regions are arranged, for example, in a hexagonal grid (honeycomb structure), a regular edge structure of the film elements corresponding to this grid results on the substrate surface. Through targeted shaping of the tear lines, therefore, different edge structures are available. This variability can be used to identify the particular document or document type because the edge structure of the transferred sheet elements can be analyzed.
  • the thin areas preferably form in a structure-forming film a multiplicity of bordered grid cells, which are particularly preferred are arranged regularly.
  • the film elements may be formed by one or more such grid cells.
  • the thin areas in producing the structure-forming film material are formed by a material structure in the areas outside the thin areas, i. in the raised areas, generated.
  • the thin areas are produced only after the production of the foil material by material removal or material deformation. These approaches can also be combined. If the thin areas are only produced after the production process by material deformation, a stamping method can be used for this purpose in a further development of the present invention. If the thin areas are produced by material removal after the production process, a chemical etching method or a corona etching method can be used for this purpose in an alternative development.
  • a further printing process for example a screen printing process, can be used for this purpose in a further development of the present invention.
  • the printing process produces a reinforced layer outside the thin areas by applying material.
  • an application (foil) element is locally reduced in the thin areas.
  • the thin areas are produced by means of a printing process by applying material outside these areas, for example a by means of electromagnetic radiation, such as UV radiation, curable polymer, such as a Cyanoacrylatlack be applied in a layer, so that sets a reduced thickness of the application element in the thin areas ,
  • the structure required for producing the thin regions can be, for example, by means of ultrasound and / or by introducing heat and temperature increase and applying a pressing pressure with a tool, for example an embossing punch or a stamping plate / embossing plate be pressed into a fusible polymer layer, such as polycarbonate, and the structure produced subsequently be fixed by cooling or by curing of the polymer caused by electromagnetic radiation.
  • a tool for example an embossing punch or a stamping plate / embossing plate be pressed into a fusible polymer layer, such as polycarbonate, and the structure produced subsequently be fixed by cooling or by curing of the polymer caused by electromagnetic radiation.
  • the polymer layer can melt locally.
  • a thermoplastic Polymer layer can be used, which is molded under temperature increase by means of the tool.
  • an etchant may act, for example, on a metal layer that is part of the pattern-forming film by thinning the metal layer in the areas where the metal layer is thinned should be removed locally (demetallization). For this required methods and, for example, chemical etchants are known in the art. If the material to be thinned is not a metal, but a layer or foil of another material, the etchant must be adjusted accordingly. As a further alternative for a removal method for producing the thin areas, the corona etching method can be used. Other ablation methods are evaporation (for example with an IR laser), laser ablation by decomposition of the material (for example with a UV laser) and chemical etching with suitable etchants.
  • the thin regions preferably do not extend completely through the structure-forming film. They are two-dimensionally rastered, ie formed in a preferably regular two-dimensional arrangement. Accordingly, the intervening raised areas are regularly, ie rasterized arranged.
  • the thin areas may be formed, for example, by continuous trenches or by mutually spaced depressions or perforations.
  • the trenches may additionally have perforations.
  • the thin areas can either be formed exclusively by trenches, for example, have a uniform depth, or in addition to trenches with uniform depth perforations that completely penetrate the material of the film. Alternatively, there may be only perforations or trenches of varying depth or other types of thin areas.
  • the cavities, recesses, recesses, recesses, openings, hollows and the like forming the thin regions are preferably in a regular one-dimensional or two-dimensional arrangement.
  • the thin areas may be formed in the form of a square, rectangular, parallelogram-like, hexagon-shaped, or even curved, borderline groups crossing each other at a predetermined arbitrary angle.
  • Grid cells are formed by the grid of the thin areas (grid cells between the thin areas form pixels in a raised form, so that a pixelated film formed by the thin areas in grid form is formed).
  • the pixels can be 'punctiform' or in the form of stripes or in some other form raised above the thin areas.
  • the minimum dimensions of the grid cells are predetermined by the desired fineness of the film element.
  • the grid has raster cells with lateral dimensions of 50 ⁇ m to 500 ⁇ m, preferably of 70 ⁇ m to 200 ⁇ m.
  • the width of the thin areas is irrelevant to their function of weakening the material of the structure-forming film. However, the width is given by the chosen production method.
  • the depth of the depressions or similar is determined by the total thickness of the film.
  • the residual thickness total thickness of the film minus the total depth of the recesses [in the case of thin regions on both sides of the film minus the sum of the mutually opposite recesses] should be so small that the film preferably tears easily only in the thin regions.
  • the residual thickness may be 5 ⁇ m to 200 ⁇ m, more preferably 30 ⁇ m to 100 ⁇ m.
  • the structure-forming material is polycarbonate or contains at least polycarbonate.
  • the structure-forming material may also be or contain PET.
  • the substrate is a value or security product or a precursor of a value or security product.
  • a thermal comb can be used, as it is also used in thermal (transfer) pressure.
  • a thermal ridge has a plurality of juxtaposed pistons, which are preferably arranged equidistant from each other.
  • a printhead used as in a conventional dot-matrix printer may be used.
  • the pixels are arranged in a 3 x 2 matrix, for example, for each line three superimposed printing tools, such as stamps are provided.
  • the individual film elements are separated by means of such printing tools preferably with a punching process of the structure-forming film (isolated).
  • the individual tools of the thermal ridge or print head can be controlled individually. Alternatively, of course, individual dies or stamping plates or sheets can be used. Preferably These are heated. If the fixation of the film elements to be made by electromagnetic radiation, this transparent / translucent tools are used. If the heat is to be supplied via vibration devices, a corresponding ultrasound generator is to be provided, the ultrasound energy of which is mechanically coupled into the tools.
  • a targeted supply of a solvent or swelling agent for connecting the film element to the substrate surface is to be provided at the location at which the film element is pressed onto the substrate surface. For this purpose, a respective suitable dispenser is available.
  • the supply of the solvent or swelling agent is also controlled separately, unless the supply is possible via capillary forces.
  • a device suitable for this purpose has a holder of the substrate and optionally a feed device for the substrate and a movement device which allows a relative movement between the substrate and the print head or stamp.
  • the substrate 100 to be provided with a three-dimensional structure may be a value or security document or a security element, which may be applied, for example, as a sticker to an article to be secured, for example a value or security document and firmly connected thereto.
  • the security or security document may be a personal document such as a passport, identity card, access badge or the like, a check card or banknote or other document. All examples below are described as representative of other types of documents based on such a card.
  • an identity card 100 shown, which has been assembled, for example, as a laminate of a plurality of inner polymer layers 140.
  • the polymer layers may consist of PC and / or PET.
  • the individual layers may be unfilled or filled with fillers. In the latter case, they are opaque, otherwise transparent.
  • the layers may preferably be connected together in such a way that they form a monolithic block which can not be split in practice.
  • Fig. 2 For illustration only, the layers still separated before lamination are shown visibly. In the finished laminate, the interfaces are no longer visible.
  • the outer layers 150 of the card may consist of a protective lacquer which has been applied to the card after lamination.
  • the protective varnish is transparent, so that underlying information is visible from the outside.
  • the card 100 has an upper side 101 and a lower side 102.
  • the third data field indicates the data of the first data field in braille
  • the fourth data field also indicates the data of the second data field in braille.
  • the data in the first and in the second data field are produced by printed layers which lie on an outer layer of the document, but immediately below the outer protective lacquer layer 150. Braille is formed by the method according to the invention.
  • the stamping tool 300 is then lowered onto the structure-forming film so that it presses the film down onto the substrate surface ( Fig. 3B ).
  • the punching tool punches the foil element 210 out of the foil so that the foil (the foil residue 230) is again transferred into the spaced-apart state ( Fig. 3C ).
  • This process corresponds to process step (b) of the process according to the invention (mechanical separation of the film element from film subregions which do not correspond to the at least one film element).
  • the film element 210 is located between the end face 310 of the punching tool and the substrate surface 101.
  • the film element is fixed on the substrate surface, ie there inextricably linked.
  • This process corresponds to process step (c) of the process according to the invention (non-detachable bonding of the film element to the surface of the substrate 100 in an adhesion region 160 of the substrate).
  • This connection takes place by direct contact between the material of the film element and the substrate surface, without there being a bonding agent therebetween.
  • the tool is lifted off the fixed film element again and transported to the starting position ( Fig. 3D ).
  • the tool may be designed to generate the heat required for this purpose, for example via a resistance heater or by means of an ultrasonic generator (a piezoelectric crystal) (not shown), and to transfer to the film element.
  • the structure-forming film 200 and thus the film element consists of a thermoplastic material, for example of PC or PET, this is at least partially melted by the temperature increase generated during the heat transfer and in this way bonds firmly to the substrate surface. This process can be further assisted by the substrate 100 also containing on the surface a thermoplastic material which at least partially melts under the conditions used.
  • a solvent or swelling agent M is applied instead of heat W.
  • the structure-forming film 200 is in this case provided with through-passing cavities 220 which, for example, are laser-ablated in the structure-forming film have been introduced.
  • a solvent or swelling agent applied from above can penetrate through the film element 210 so that it reaches the underside 215 of the film element, ie, up to the contact surface between the film element and the substrate surface 101 (FIG. Fig. 5 ).
  • the solvent or swelling agent is injected from the tool into the film element, for example through corresponding nozzle openings 320 in the stamping surface 310.
  • the solvent or swelling agent penetrates through the cavities to the underside 215 of the film element and connects this there with the substrate 100, while the film element is pressed firmly onto the substrate surface.
  • the solvent or swelling agent may be, for example, methyl acetate.
  • cavities 220 through cavities, openings, channels or the like produced in a different manner may be provided in order to guide the solvent or swelling agent M from the top to the bottom 215 of the film element 210.
  • the film element 210 used there is formed from a multiplicity of grains, for example granules, which are joined together in a baking process. At the grain boundaries are still left cavities, which allow the passage of the solvent or swelling agent.
  • This foil element is porous.
  • the film may also be present as an open-pored foam.
  • the preparation of such materials is known.
  • the structure-forming film can also be pixelated, i. be provided with thin areas.
  • a structure-forming film 200 according to a first embodiment of this development of the present invention is in Fig. 7A shown in the clipping.
  • the film has a carrier layer 240 and raised regions (raster cells) 250, which are separated from one another by thin regions 260. Furthermore, a separating layer 295 is located between the carrier layer and the raised areas.
  • the carrier layer may be, for example, a PET film and the separating layer may be a silicone layer.
  • the raised areas may be formed of PC, for example.
  • One or more raster cells finally form the film element 210 to be transferred to the substrate 100.
  • the carrier layer and the separating layer may be in the form of a band be.
  • the structure-forming film can also be formed without a separating layer, so that together with the raised areas, these bearing areas of the carrier layer are also punched out and transferred to the substrate surface.
  • the thin regions 260 are provided.
  • the thin areas define the grid cells 250 lying between them.
  • the thin areas on the film 200 form a honeycomb-like structure of narrow trenches 260 with the grid cells 250 arranged therebetween (pixelized film).
  • the thin areas penetrate the film element completely, but do not reach into the carrier layer and possibly the separating layer ( Fig. 7A ).
  • the thin areas are formed in the film in a regular arrangement, namely in a two-dimensional gridded arrangement.
  • a possible example of such a pixelated film is in Fig. 8 shown. In this example, the spacing of adjacent thin areas and the size of the grid cells are constant.
  • the structure-forming material can be structured, for example, in an embossing process.
  • the structure-forming material in the thin regions may be partially removed, for example by a polymer etching process.
  • polyimide can be removed with an alkaline solution.
  • an etching mask is used which prevents polymer material from being removed even in the areas which are not to be removed. The etching masks are removed again after the generation of the thin regions.
  • the raised areas 250 of the Fig. 7A shown film 200 are then as in Fig. 3 shown brought into contact with the substrate 100.
  • the backing sheet 240 faces up to the tool 300, and the raised portions are aligned with the substrate surface 101.
  • a pixel or halftone dot 400 results there (FIG. Fig. 7B ).
  • a substrate with two pixels 400, 400 ' is obtained ( Fig. 7C ).
  • a plurality of raised areas to be applied simultaneously to the substrate surface, which together form a film element.
  • a pixelated film has the additional advantage for the method according to the invention, in which, in addition to the pressing pressure by the tool, a solvent or swelling agent to insoluble Connecting the film element is supplied to the substrate surface, that the solvent or swelling agent can easily penetrate through the thin areas in the film layer.
  • the carrier layer 240 and the separating layer 295 are provided with cavities.
  • a structure-forming film 200 is formed which has thickened regions 250 of a polymer film, for example a PC film, and intervening thinner regions 260 in a specific pattern ( Fig. 9 ).
  • the material of the thickened regions may be substantially the same as the material of the polymer film.
  • the material for the thickened areas for example in the form of a paint can be printed on the polymer film, for example by a screen printing process.
  • the raised areas serve to form surveys 400 for braille on a value and / or security document.
  • the grid spacing of the elevations corresponds to the spacing of the dots in the Braille dot pattern which is customary for Braille writing. For repetitive plotting of dot patterns on documents, such a tape may be produced ( Fig. 9A ).
  • the tape is pressed with the elevations on the surface 101 of the substrate 100 and non-detachably connected to the substrate by means of heat and / or under the action of a solvent or swelling agent or in some other way.
  • a foil element 210 in this case corresponds exactly to a survey. This is located in an adhesion region 160 on the substrate surface.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Printing Methods (AREA)

Claims (12)

  1. Procédé servant à former au moins une structure (400, 400') tridimensionnelle sur au moins une surface (101) d'un substrat (100), comprenant des étapes de procédé qui suivent consistant à :
    a. fournir le substrat (100) ainsi qu'un matériau structurant sous la forme d'un film (200) ;
    b. séparer de manière mécanique au moins un élément de film (210) de zones partielles de film (230), qui ne correspondent pas à l'au moins un élément de film (210) ; et
    c. relier de manière inamovible l'au moins un élément de film (210) à l'au moins une surface (101) du substrat (100) dans respectivement une zone d'adhésion (160) du substrat (100),
    si bien que l'au moins un élément de film (210) réalise sur l'au moins une surface (101) du substrat (100) l'au moins une structure (400, 400') tridimensionnelle,
    caractérisé en ce que l'au moins un élément de film (210) est relié de manière inamovible à l'au moins une surface (101) du substrat (100) à l'étape de procédé (c) par l'application locale d'un solvant ou d'un agent de gonflement (M) pour le matériau structurant du film (200) et/ou pour le matériau du substrat (100) dans l'au moins une zone d'adhésion (160).
  2. Procédé selon la revendication 1, caractérisé en ce que l'au moins un élément de film (210) vient en contact direct avec l'au moins une surface (101) du substrat (100) lors de la liaison inamovible à l'au moins une surface (101) du substrat (100).
  3. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'au moins un élément de film (210) est relié de manière inamovible par la compression locale dans l'au moins une zone d'adhésion (160) au niveau de l'au moins une surface (101) du substrat (100) et par réchauffage.
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le matériau structurant du film (200) présente des cavités (220) traversant ce dernier si bien qu'un solvant ou un agent de gonflement (M) appliqué sur un côté du film (200) faisant face à un côté de contact (215) du film (200) avec l'au moins une surface (101) du substrat (100) peut traverser le film (200) et peut parvenir au côté de contact (215) du film (200).
  5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le matériau structurant du film (200) est relié de manière inamovible par point sur l'au moins une surface (101) du substrat (100) conformément à une matrice.
  6. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le film (200) présente une épaisseur allant de 50 à 150 µm.
  7. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le matériau structurant du film (200) présente des zones minces (260) disposées de manière régulière si bien que l'au moins un élément de film (210) est séparé de manière mécanique le long de zones minces (260) enlacant l'élément de film (210) de zones de partie de film (230), qui ne correspondent pas à l'au moins un élément de film (210).
  8. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le matériau structurant est du polycarbonate ou contient au moins ce dernier.
  9. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le substrat (100) est formé à partir de polycarbonate ou contient au moins ce dernier.
  10. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que les structures (400, 400') tridimensionnelles codent une information.
  11. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que les structures (400, 400') tridimensionnelles forment des éléments d'un braille.
  12. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le substrat (100) est un produit de valeur ou de sécurité ou un produit formant ébauche d'un produit de valeur ou de sécurité.
EP14786203.1A 2013-10-21 2014-10-20 Procédé de formation d'au moins une structure tridimensionnelle sur au moins une surface d'un substrat et pellicule de transfert Active EP3060408B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201310221337 DE102013221337A1 (de) 2013-10-21 2013-10-21 Verfahren zum Bilden mindestens einer dreidimensionalen Struktur auf mindestens einer Oberfläche eines Substrats
PCT/EP2014/072399 WO2015059073A1 (fr) 2013-10-21 2014-10-20 Procédé de formation d'au moins une structure tridimensionnelle sur au moins une surface d'un substrat et pellicule de transfert

Publications (2)

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EP3060408A1 EP3060408A1 (fr) 2016-08-31
EP3060408B1 true EP3060408B1 (fr) 2018-04-04

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EP14786203.1A Active EP3060408B1 (fr) 2013-10-21 2014-10-20 Procédé de formation d'au moins une structure tridimensionnelle sur au moins une surface d'un substrat et pellicule de transfert

Country Status (4)

Country Link
EP (1) EP3060408B1 (fr)
DE (1) DE102013221337A1 (fr)
ES (1) ES2668303T3 (fr)
WO (1) WO2015059073A1 (fr)

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3314327C1 (de) 1983-04-20 1984-07-26 GAO Gesellschaft für Automation und Organisation mbH, 8000 München Ausweiskarte und Verfahren zur Herstellung derselben
DE4110801C1 (fr) 1991-04-04 1992-05-27 Kurt 4040 Neuss De Lappe
JP3686555B2 (ja) 1999-07-23 2005-08-24 大日精化工業株式会社 プリント加工品の製造方法
FR2800011B1 (fr) * 1999-10-22 2001-12-07 Oreal Procede de marquage a chaud et structure multicouche pour la mise en oeuvre d'un tel procede
US20080258457A1 (en) * 2006-09-08 2008-10-23 De La Rue International Limited Method of manufacturing a security device
DE102007006516A1 (de) * 2007-02-09 2008-09-04 Fujitsu Siemens Computers Gmbh Computersystem und Verfahren zum Begrenzen eines Signalpegels
DE102008001712A1 (de) 2007-10-30 2009-05-07 Manroland Ag System zum Erzeugen fühlbarer Strukturen auf Druckprodukten
DE102007052947A1 (de) 2007-10-31 2009-05-07 Bayer Materialscience Ag Verfahren zur Herstellung eines Polycarbonat-Schichtverbundes
US8758865B2 (en) 2008-09-04 2014-06-24 Xerox Corporation Ultra-violet curable gellant inks for tactile and regular print applications for signature and document authentication
DE102010035890A1 (de) 2010-08-30 2012-03-01 Bundesdruckerei Gmbh Verfahren zur Herstellung eines Sicherheitsdokuments mit einer mikroporösen laminierfähigen Druckfolie und Sicherheitsdokument
DE102012001121C5 (de) * 2012-01-23 2018-01-04 Leonhard Kurz Stiftung & Co. Kg Sicherheitsdokument, Verfahren zur Herstellung eines Sicherheitsdokuments und Verfahren zur Herstellung eines individualisierten Sicherheitsdokuments

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DE102013221337A1 (de) 2015-04-23
EP3060408A1 (fr) 2016-08-31
WO2015059073A1 (fr) 2015-04-30
ES2668303T3 (es) 2018-05-17

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