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    • 专利摘要:
    SECURITY THREAD OR TAPE INCLUDING PAINT ORIENTED MAGNETIC PARTICLES, AND METHOD AND MEANS FOR THE PRODUCTION OF THE SAME. The present invention relates to a security thread or tape for embedding in or on a currency document or substrate, as well as a common method and means of making such a thread or tape. The thread or tape comprises a thin plastic sheet bearing a hardened coating comprising magnetic or magnetizable pigment particles, the orientation of said pigment particles representing graphical information. Optically variable magnetic or magnetizable pigment particles are preferred. Said hardened coating can also be comprised between a first and a second thin plastic sheet. Said graphical information is a seamless repeating pattern of suitable repeat length, which is produced using a magnetic guide cylinder with a seamless repeating magnetic field pattern. A magnetic guide cylinder and a process for producing such a magnetic guide cylinder are also described. The process comprises coating a cylindrical support body with a polymer material comprising a permanent magnetic powder of high coercibility (...).
    公开号:BR112012021633B1
    申请号:R112012021633-3
    申请日:2011-03-03
    公开日:2021-06-08
    发明作者:Edgar Müller；Gebhard Ritter；Pierre Degott；Claude-Alain Despland；Mathieu Schmid
    申请人:Sicpa Holding Sa；
    IPC主号:
    专利说明:

    Field of Invention
    The present invention is in the field of security threads or tapes, to be incorporated into or on securities documents or currency substrate. It discloses a security thread or tape comprising features implanted through a particular orientation of magnetic or magnetizable pigment particles, in particular optically variable pigment particles, in a coating comprised on said thread or tape, as well as a method and device for producing such a thread or tape. Technical Background
    Security threads embedded in the substrate are known to a knowledgeable person as an efficient means of protecting security documents and banknotes from imitation. Reference is made to documents No. US 0,964,014; No. US 4,652,015; US 5,068,008; No. US 5,324,079; no. WO 90/08367; No. WO 92/11142; No. WO 96/04143; no. WO 96/39685; WO 98/19866; EP-A 0 021 350; EP-A 0 185 396; EP-A 0 303 725; EP-A 0 319 157; EP-A 0 518 740; EP-A 0 608 078; EP-A 0 635 431; and EP-A 1 498 545 as well as the references cited therein.
    A security thread is a metal or plastic filament that is incorporated during the manufacturing process into the substrate that is used to print security documents or banknotes. The security thread can thereby be completely embedded in the substrate sheet, or it may be partially embedded and partially exposed on the substrate surface ("window thread"), or it may even be affixed to the substrate surface or serve as a bridge to two separate parts of the substrate sheet; such threads are also called ribbons.
    A security thread or tape can, and does in general, carry particular security elements, which serve for identification by machine and/or by the public of security documents, in particular for banknotes. Suitable security elements for this purpose are, for example, metallization, luminescent composite (incorporated into or printed on the thread or tape), a microtext, a magnetic feature, etc.
    Due to the technical limitations of industrial manufacturing, the security thread or tape has to be incorporated from a roll to a continuous sheet of substrate material, such as paper currency, several hundred meters long. Such a thread or tape is generally produced by a corresponding slitting of a reel of a thin plastic sheet (such as a thin sheet of mono- or bi-oriented polypropylene (PP), polyvinyl chloride (PVC), or polyethylene terephthalate (PET) ) treated in a particular way (i.e. metallized, etched, laminated, etc.) to generate the required rolls of security thread or tape.
    In a common embodiment, said thin plastic sheet is metallized and/or engraved on a single side. Metallization can, in addition, be present in the form of a symbol in positive or negative writing. In a more sophisticated modality, said thin plastic sheet is a laminated structure consisting of two thin sheets that are laminated together, enclosing security elements such as a printed feature and/or a metallization, between two thin plastic sheets.
    Optically Variable Magnetic Pigment (OVMP®) and Optically Variable Magnetic Inks (OVMI®) comprising OVMP® are known to a person skilled in the art, for example, from US documents No. 4,838,648; no. WO 02/073250; No. EP 686 675; no. WO 03/00801; US 6,838,166; and no. WO 2007/131833. Such inks can be applied or printed in the form of ordinary coatings (ie covering the entire surface) or in the form of structured coatings (ie symbol).
    The optically variable pigment particles in an optically variable magnetic coating can be oriented after printing while the coating is still "wet", ie not hardened, by applying a structured or magnetic field. unstructured, and then fixed in their respective positions and orientations by curing the coating composition onto a substrate. Materials and technology for orienting magnetic or magnetized particles in a coating composition, and combined print/magnetic orientation processes have been described in US 2,418,479; No. US 2,570,856; No. US 3,791,864; No. DE 2006848-A; US 3,676,273; No. US 5,364,689; No. US 6,103,361; No. US 2004/0051297; No. US 2004/0009309; No. EP-A-710508, No. WO 02/090002; No. WO 03/000801; No. WO 2005/002866, and No. US 2002/0160194, as well as No. WO 2008/046702 by the same applicant.
    Items comprising magnetically oriented particles in a hardened coating on a transparent or opaque substrate are known in the art, for example from WO 2008/009569. However, a particular technical problem arises in the case of security threads or tapes, where they have to i) exhibit a seamless repeating pattern in their elongated direction, and ii) the length (period) of repetition of said pattern has it must be less than the width, preferably less than half the width of the banknote or security document in which they are incorporated.
    These requirements ensure that i) there is no need to cut off parts of the security document substrate, nor to align the print of the banknote or security document with the information present on the thread or tape, as the latter is continuous (no hops) along the security thread or tape, and that ii) at least an entire period of the information present on the thread or tape is actually present on/in each banknote or security document, allowing an authentication unambiguous of these is possible.
    These requirements have not previously been met for magnetically oriented particles in a hardened coating on a substrate. Description of the Invention
    The thread or tape in accordance with the present invention, preferably for incorporation into or on a security document or currency substrate, comprises a thin plastic sheet bearing a hardened coating comprising oriented magnetic or magnetizable pigment particles, wherein the orientation of said pigment particles represent graphic information, and the security thread or tape is characterized in that said graphic information is a repeating seamless pattern of suitable repeat length.
    "Hardened" in the context of the present disclosure means that the optically variable magnetic or magnetizable pigment particles are fixed in their respective positions and orientations within the coating.
    An "adequate repeating length" (period) means that it is less than the width, preferably less than half the width of the document into which the thread or tape is to be embedded.
    Preferred magnetic or magnetizable pigment particles to encompass the present inventions are needle- or plate-shaped particles because they orient themselves well in magnetic fields and show a profound change in optical appearance as a function of their orientation in the coating.
    Even more preferred are optical interference pigments, which exhibit a reflection or transmission color variation as a function of their orientation in the coating.
    The most preferred pigment particles to encompass the present invention are optically variable magnetic thin layer interference pigments of the 5-layer A/D/M/D/A type, as described in US 4,838,648, and of the 7-layer A/D/R/M/R/D/A type as described in WO 02/073250. In this document, A designates an absorber layer, typically a chromium layer; D designates a dielectric layer, typically a magnesium fluoride (MgF2) or silicon dioxide (SÍO2); M designates a magnetic layer, typically nickel (Ni) or iron (Fe) or cobalt (Co) or one of their alloys, and R designates a reflective layer, typically aluminum (Al).
    In the context of the present disclosure, the term "magnetic" refers to a material which is itself a source of a magnetic field. The term "magnetizable" refers to a material that reacts to a magnetic field in the sense of magnetism of iron or irons, without being the source of it.
    Oriented magnetic or magnetizable pigment (OVMP) particles, in the context of the present invention, means pigment particles that are present in the coating in an orientation that is different from what they have adopted as the result of a simple printing process.
    "Graphical information" means symbols, patterns, images, and any other type of information that can be visually identifiable.
    In accordance with the present invention, graphic information is encompassed in the coating through the orientation of magnetic or magnetizable pigment particles comprised in the coating.
    In a preferred embodiment of the present invention, the hardened coating is a structured coating in the shape of a symbol, and is applied using an ink and a corresponding printing process.
    The guided graphical information of magnetic orientation is generally different from the printed symbol of the structured coating; however it can also be chosen in the same way.
    Thus, it is possible, according to the present invention, to confer on the thread or tape two different security elements, that is, the symbol and the graphic information guided by magnetic orientation printed and visible, in a simple pass over the machine. printing using a single printing ink, which increases the security level of the security thread or tape while maintaining improved production efficiency.
    The magnetic orientation guided graphical information is also machine readable, because the magnetic or magnetizable particles arranged in a particular way in the printed and hardened coating composition produce or interact with the magnetic fields, and their distribution, and orientation can of this way to be detected and exploited by the corresponding equipment.
    An essential feature of the security thread or tape in accordance with the present invention is that the magnetically guided graphical information and, if present, the printed and visible symbol, are present with a seamless repeatable suitable repeat length pattern. along the extended dimension of the security thread or tape.
    Taking into account the limitations imposed by the conditions of banknote fabrication (ie substrate fabrication and printing) and use (ie authentication of the security thread or tape in automatic bank machines), the security threads or tapes have to be incorporated into the substrate spool lengthwise, but should appear across the width of the banknote, which is generally less than 10 cm, and typically on the order of 7 cm. The period of the repetitive pattern should therefore not exceed 7 cm, preferably not exceed 3.5 cm, and even better not exceed 2 cm.
    Seamless engraving of thin plastic sheets with repeating patterns of optically variable magnetic ink under the limitation of such small repeat lengths requires particular means and techniques of production (i.e. printing).
    Rotogravure (engraving) printing using a specially notched seamless gravure cylinder has been found to be one of the suitable printing techniques to properly transfer an ink liquid containing magnetic or magnetizable pigment particles to a flat plastic substrate. The gravure cell in the gravure cylinder has, to be suitable for printing banknotes, to be large enough to handle the extended size of the magnetic or magnetizable pigment particles, which in particular can be flakes with a diameter in the range of 5 and 50 micrometers and a thickness on the order of 1 micrometer. A cell size of at least twice the average pigment particle diameter is typically used.
    Screen printing using a seamless rotating screen (such as obtained from Stork Prints BV, Boxmeer, The Netherlands) has been found to be another suitable printing technique for engraving thin plastic sheets with seamless repetitive patterns of an ink with magnetic or magnetizable pigment particles under the limitation of small repeat lengths. Here too, a screen mesh size of at least twice the average pigment particle diameter is typically used.
    As an additional process, flexographic printing using Anilox bearing ink/Doctor Blade blade can also be used. Anilox bearing has rotogravure cells, which measure the ink liquid for continuous flexographic relief plate, which is a flexible letterpress printing surface that transfers ink to the substrate to be printed. Flexographic printing performs well if the pigment particles are not large in size, and performs not so well in the case of pigment particles such as board, which are not easily transferred from one surface to another. For an Anilox bearing, a cell size of at least twice the average diameter of the pigment particles is typically used.
    In all cases, the print surface must be structured to represent a seamless repeating pattern; in other words, the circumference of the printing cylinder or seamless flexographic embossing plate must be an exact multiple of the repeating length (period) of the respective pattern to be printed.
    In a preferred embodiment, the hardened coating comprising optically variable magnetic or magnetizable pigment particles is associated with a colored, dark or metallized background coating. Said base coat can be applied or printed in a previous, next, or separate step.
    If the security thread or tape is to be seen through the thin plastic sheet, the base coat can be applied as a second coat, after application (and hardening) of the optically variable magnetic ink.
    Additional coatings can be applied as a function of technical and aesthetic needs, such as pigmented coatings to provide color and/or opacity, or adhesive coatings to secure the thread or tape in or on the securities document or banknote substrate .
    According to a particular additional embodiment of the present invention, the security thread or tape is a laminated thread or tape comprising a hardened coating, produced with an ink comprising optically variable magnetic or magnetizable pigment particle, which is comprised between a first and a second thin plastic sheet.
    In yet a further embodiment, the security thread or tape, according to the present invention, is a laminated thread or tape obtained by laminating in-record a first plastic thin sheet bearing a first recording onto a second plastic thin sheet bearing a second recording that is complementary to the first impression.
    Laminating two thin sheets together in register with mutually complementary engravings requires high-precision laminating and printing equipment, which provides improved counterfeiting resistance to the so-produced thread or tape.
    The security thread or tape, according to the present invention, comprises the hardened coating produced with an ink comprising magnetic or magnetizable pigment particles, it may also comprise security materials selected from the group consisting of dyes and luminescent pigments, infrared absorbing pigments and dyes, as well as metallic, magnetic and interference pigments. Said security materials can additionally be comprised of the same said coating or of at least one separate coating layer.
    The security thread or tape according to the present invention may further comprise a microlenses layer or a holographic layer, the latter of which may be a volume hologram or surface (symbol) hologram, metallized, demetallized, or even. -cially demetallized.
    The security thread or tape in accordance with the present invention may comprise an adhesive coating, as known in the art, on at least one of its surfaces to provide adhesion to the security substrate. Thermally activated adhesives that adhere to the paper fibers at the end of the drying and dewatering process are typically used for this purpose.
    The preferred security thread or tape, according to the present invention, has a width of between 0.5 mm and 30 mm. It is obtained by cutting the coil from the engraved, coated and, if applicable, laminated thin plastic sheet into filaments of appropriate width and winding them into rolls.
    A method of producing a security thread or tape for incorporation into a securities document or currency substrate is further described, comprising: a) coating a thin plastic sheet with a coating composition comprising pigment particles magnetic or magnetizable; b) orienting the magnetic or magnetizable pigment particles in the coating onto the thin plastic sheet by applying a correspondingly structured magnetic field so that the orientation of said pigment particles represents graphical information; c) hardening the coating comprising the oriented magnetic or magnetizable pigment particles so as to fix the optically variable magnetic or magnetizable pigment particles in their respective positions and orientations; y) optionally applying an adhesive coating over at least one surface of the thin plastic sheet; z) carving the thin plastic sheet bearing said hardened coating comprising optically variable magnetic or magnetizable pigment particles into threads or ribbons; wherein the method is characterized in that said graphical information is produced using a magnetic guide cylinder having a seamless repetitive magnetic field pattern of suitable repeating length.
    Preferred magnetic or magnetizable pigment particles to be comprised in a coating composition are selected from plate- or needle-shaped particles; particularly preferred are optical magnetic interference pigments which exhibit a reflection and transmission color variation as a function of their orientation in the coating; and most preferred are pigments of the 5-layer type as described in US 4,838,648, and the 7-layer as described in WO 02/073250; see above.
    The plastic thin sheet is preferably a thin sheet of polyethylene terephthalate (PET, polyester). However, other plastic materials can be used as well, such as mono- or bi-oriented polypropylene (PP), polyvinyl chloride (PVC), or form-stable varieties of polyethylene (PE).
    Etching the thin plastic sheet with a coating composition comprising magnetic or magnetizable pigment particles, followed by orienting said pigment particles in the coating by applying a correspondingly structured magnetic field and hardening the printed ink and "oriented" can be done in a single-step industrial operation, which can provide two independent "information layers" (printed symbol and guided magnetically oriented graphic information) using a single ink.
    The method comprises the application of more than one printed layer. In a preferred embodiment, the method comprises an additional step of: d) applying a colored, dark, or metallized background coating over the hardened coating of step c) comprising the optically variable magnetic or magnetizable pigment particles.
    Said base coat can be applied by a variety of coating processes known in the art, such as etching with an ink comprising dark or colored pigments or dyes, or by high-vacuum coating with metals (preferably aluminium); such a high vacuum coating step may optionally be followed by a selective demetallization step (eg according to Crane, document no. US 4,652,015) so as to produce symbol on the metal coating.
    Additional security materials selected from the group consisting of luminescent pigments and dyes, infrared absorbing dyes and pigments, as well as metallic, magnetic, and interference pigments can be applied, either in said same coating or in at least one separate coating layer.
    A microlenses layer or a holographic layer which can be a volume hologram or a metallized, demetallized, or partially demetallized surface (symbol) hologram can be applied.
    An adhesive coating as known in the art can be applied over at least one surface of the thin plastic sheet to provide adhesion to the security substrate at the time of incorporation of the thread or tape to or on the substrate.
    The method may further comprise the additional alternative step of: e) laminating a second plastic thin sheet onto the coated plastic thin sheet to produce a laminated structure wherein said hardened coating comprises optically variable magnetic or magnetizable pigment particles is comprised between a first and a second thin plastic sheet.
    Step e) can be performed either in place of step d), or alternatively after step d).
    The second thin plastic sheet can carry a coating on the laminating surface so as to facilitate the laminating operation. In particular, said coating can be a colored, dark, or metallized basecoat.
    In a preferred embodiment of the method, the second thin plastic sheet carries a second engraving, which is complementary to the first engraving on the thin plastic sheet. Complementary means that the second recording completes the first, so that only the two recordings together evidence the complete information. Separate printing of complementary symbol on two thin sheets that are to be laminated together in exact registration requires high precision printing and laminating equipment, which results in improved counterfeiting resistance of the thus produced threads or ribbons.
    In a preferred method, according to the present invention, the engraving of the first thin plastic sheet with an ink comprising magnetic or magnetizable pigment particles is performed with a printing process selected from the group consisting of gravure printing with the use of a seamless notched print cylinder, screen printing with the use of a seamless rotating screen, and flexographic printing with the use of an Anilox bearing/Doctor Blade ink unit, where the print surface represents a seamless repeating pattern, that is, the circumference of the printing cylinder or continuous flexographic embossing plate is an exact multiple of the repeating length (period) of the repeating pattern to be printed.
    In a preferred embodiment, according to the present invention, the orientation of the magnetic or magnetizable pigment particles in the etched coating, so that the orientation of said pigment particles represent graphical information, is performed using a cylinder of magnetic orientation whose outer surface is a notched permanent magnetic plate, as described in WO 2005/002866 and WO 2008/046702.
    In a preferred embodiment, according to the present invention, the hardening of the coating engraved on the substrate is carried out by a method chosen from physical drying by solvent evaporation, and most preferably, curing by beam irradiation electron beam or with UV light. Radiation curing has the advantage of an almost instantaneous solidification of the ink, preventing the oriented magnetic particles from rearranging in the ink.
    Particularly preferable is curing by direct UV irradiation on the magnetic guide roller, so that orientation of the magnetic or magnetizable pigment particles in the coating and initiation of hardening of the coating occur concomitantly. After UV irradiation, the coating solidifies in less than a second. Direct UV irradiation on the magnetic orientation cylinder thus ensures maximum retention of the graphic information conferred in the magnetic orientation step.
    In the last step of the method (step z), the thin sheet spool thus obtained is finally cut into security threads or tapes, the threads or tapes with a width of between 0.5 mm and 30 mm, and the threads or tapes of are securely wound onto the roller for additional use.
    Security threads or tapes can be incorporated into or applied to any type of substrate to be protected against counterfeiting, in particular, paper and polymer substrates used to make currency, securities documents, identification documents, transport tickets, or tax stamps.
    A device for magnetically orienting the magnetic or magnetizable pigment particles in the coating etched onto the thin plastic sheet used to make security threads or tapes is further described.
    The device for magnetically orienting the magnetic or magnetizable pigment particles in the engraved coating is a cylinder with a magnetized outer surface, wherein the magnetization is structured to represent a seamless repeating pattern of suitable repeating length; in other words the circumference of the cylinder is an exact multiple of the period (repeating length) of the repeating pattern.
    The magnetic guide cylinder can be produced by packaging a flexible and magnetically inscribed permanent magnetic plate (e.g. "Plastoferrite") around a cylindrical support body and securing it in such a position so as to result in a seamless repetitive magnetization pattern around the circumference of the magnetic guide cylinder. The magnetizable permanent magnetic plate may be a notched permanent magnetic plate as described in WO 2005/002866 and WO 2008/046702.
    In a preferred embodiment, the magnetic guide cylinder is seamlessly coated with a "plastic magnet" coating, in which the seamlessly repetitive magnetization pattern is inscribed. Alternatively, the outer cylinder surface of the seamlessly coated cylinder may be grooved with a seamless repetitive pattern, and magnetized as described in WO 2005/002866.
    Such a seamless coated magnetic guide cylinder is advantageous for producing the security thread or tape of the present invention when combined with a corresponding seamless gravure cylinder or a seamless rotating screen cylinder operated in register with the cylinder. magnetic orientation, because of the mechanical stability of the seamless coating and the resulting possibility of printing and orienting at high speed.
    The magnetic guide cylinder, according to the invention, can additionally comprise permanent magnets or electromagnets arranged inside the cylindrical support body, in order to produce the effects described in document No. WO 2008/046702 by the same applicant. Particularly preferred are magnet arrangements that are mechanically held in position against the inherent magnetic forces working between them.
    A process for producing a seamless coated magnetic guide cylinder is further described, the process being characterized by the steps of: a) coating a cylindrical support body with a polymer material comprising a high coercibility permanent magnetic powder as a filler material and harden the polymer material so as to obtain a seamless coated cylinder; * llkl b) optionally grind the outer surface of the coated cylinder to obtain a standardized cylinder diameter; c) magnetize the outer cylinder surface of step a) or tray step) to inscribe a seamless repetitive magnetic field pattern over the cylinder.
    Said coating and curing can be carried out either by applying a thermoplastic composition hot melt and cooling to solidify the composition, or by applying a Plastisol precursor composition and heat curing so as to form and solidify the Plastisol.
    The polymer material can be chosen from thermoplastic materials that are commonly used to make "plastic magnets" such as polyethylene or a polyamide. Low Density Polyethylene (LDPE) is heat meltable and can be used to formulate plastic magnet compositions (HS Gokturk et al. ANTEC '92; Annual Technical Conference of the Society of Plastics Engineers, Detroit, Ml, May 1992; pages 491 to 494; Journal of Applied Polymer Science, Vol 50, 1891 to 1901, (1993)). Plastic and rubber magnets were first described in French patent no. FR1135734 (M.J. Dedek; 1955). Document No. JP56000851A2 (Komeno Hiroshi; 1981) discloses a plastic magnet composition based on thermoplastic polyamide resin. See also H. Stablein, "Hard Ferrites and Plastoferrites", in Ferromagnetic Materials, Vol. 3, ed. E.P. Wohlfarth, North-Holland Publishing company, 1982, chapter 7, pages 441 to 602.
    The coating of the cylindrical support body can then be carried out, for example, in analogy to T. Sakai et al., Intern. Polymer Pro-cessing, 6, 26 to 34 (1991), which discloses a process for manufacturing plastic magnets, relying on the use of Nylon 6 as a thermoplastic binding agent and strontium hexaferrite powder (SrO*6Fe2Os) from 1.1 to 1.2 micrometre particle size as a high coercibility permanent magnetic filler material.
    Alternatively, the coating of the cylindrical support body can be performed in accordance with documents no. US 3,785,286, no. US 3,900,595, and no. of polyvinyl chloride (PVC) in conjunction with one or more plasticizers and a stabilizer. The Plastisol composition including the permanent magnetic filler material is formulated and applied onto the cylindrical support body at temperatures from 40°C to 50°C, and hardened at temperatures from 200°C to 250°C. Plastisol coating is applied in several layers, each with a thickness between 0.3 and 1 mm, up to a total thickness of 2 to 3.5 mm.
    Examples of permanent magnetic powders that are useful as fillers are "hexaferrites" of the formula MFe^Oig, such as strontium hexaferrite (SrO*6Fe2O3) or barium hexaferrite (BaO*6Fe2Os), and "hard ferrites" of the formula MFe2O4, such as cobalt ferrite (CoFe2O4) or magnetite (FesO4), and that M is a divalent metal ion, as well as its isostructural substitution derivatives; additionally samarium cobalt alloys, and rare earth iron boron alloys (RE2Fei4B, eg "neodymium magnets" Nd2Fei4B), where RE is a trivalent rare earth ion or a mixture of rare earth ions trivalents.
    Preferably, high coercibility permanent magnetic powders are used in the composition in a demagnetized state, so as to avoid an agglomeration of magnetic powder particles. Degaussing ("degassing") magnetic materials is an operation known to the person skilled in the art. Preferably, a magnetization is applied only after the composition is in place and hardened.
    The optional grinding step is a simple ablation operation on a ruler. It serves to establish the precise mechanical dimension to provide the circumference of the cylinder to be an exact multiple of the period (repeat length) of the repetitive magnetization pattern.
    Structured magnetization of the cylinder surface can be performed, as is known to a person of skill, for example, by applying a magnetic stylus in accordance with US 3.011.436 (Berry) or in mechanical and electromagnetic analogy for the Berry's revelation, by inscribing the repetitive magnetization pattern required with a mechanically actuated electromagnetic stylus.
    In a particularly preferred embodiment of the process, step c) comprises a carving step: c) carving the outer surface of the coated cylinder from step a) or step b) with the respective seamless repetitive pattern, and magnetizing the cylinder.
    The notching and magnetizing of the outer cylinder surface can be carried out as described in document no. WO 2005/002866. In particular, notching can be performed using ablative tools selected from the group comprising mechanical ablation tools, liquid or gas jet ablation tools, and laser ablation tools.
    Magnetization can be applied before or after the notching step. Magnetic fields orthogonal to the cylinder surface as well as fields in oblique directions relative to the cylinder surface, or even in directions within the cylinder surface can be applied.
    The magnetization of the outer surface of the cylinder can furthermore be combined with the arrangement of magnets within the cylindrical support body as described in WO 2008/046702; being that said magnets can still be magnets or permanent electromagnets.
    The invention is explained further below with reference to the figures and exemplary embodiments. Description of Figures
    Figure 1 schematically illustrates the cross section of a first embodiment of a security thread or tape in accordance with the present invention;
    Figure 2 schematically illustrates the cross section of a second embodiment of a security thread or tape in accordance with the present invention;
    Figure 3 schematically illustrates the cross section of a third embodiment of a security thread or tape in accordance with the present invention;
    Figure 4 schematically illustrates the cross section of a fourth embodiment of a security thread or tape in accordance with the present invention;
    In Figures 1 to 4, the different layers are as follows: 1a: Olyethylene terephthalate (PET) film 2a: Ink layer with magnetically oriented pigments 3a: Black ink layer 4a: White ink layer 5a, c : Thermal adhesive layers 5b: Lamination adhesive layer 6a: Invisible fluorescent paint layer
    Figure 5 is a schematic view of a dedicated thin sheet reel printing press for producing security threads or tapes in accordance with the present invention. Description of the different parts of the machine:
    51: Screen printing unit G1, 2, 3: Engraving printing units M, R: Magnetic orientation units (cylinders) Magnetic orientation can be produced on one or the other of these cylinders, depending on which printing unit it is used for applying paint comprising magnetic or magnetizable particles. H1, 2, 3, 4: Hot air dryer units U1, 2, 3, 4: UV dryer units
    Figure 6A is a front view of a sample of the coil produced in example 1 (before the chopping process)
    Figure 6B is a specimen banknote printed on a substrate bearing a window thread produced in accordance with Example 1 Example 1
    In the first example, the description of an optically variable magnetic security thread according to the first invention is provided. The security thread has a schematic cross section as described in Figure 1. It can be produced by engraving a thin plastic sheet on a dedicated printing press, as shown schematically in Figure 5, combining engraving (G1, G2 and G3 ), screen (S1) printing units and magnetic orientation (M, R), and die-cutting of the engraved thin sheet, according to the following steps: a) A 15 μm thick PET film (1a) is engraved on the unit screen printing (S1) with a UV-curable ink containing optically variable magnetic pigments (layer 2a), as described in Example 2 (base formula) of document no. WO 2007/131833. The screen is chosen so as to deposit a typically 18 µm dry ink layer. The freshly printed ("wet") ink layer is exposed to the magnetic fields of a polyethylene magnetic guide cylinder comprising 75wt% strontium hexaferrite. The surface of this magnetic coating is magnetized with a helical pattern of alternating polarities in the form of 1.5 mm wide bands; the distance between the bands of the same polarity being 3 mm, and the angle of the bands in relation to the printing direction is 45°. The optically variable magnetic pigments comprised in the printed ink are thereby oriented and a specific graphic information pattern is produced on that layer, as shown in Figure 6A. The ink is hardened as the coil passes under the hot air (H1) and UV (U1) dryer units b) A layer of solvent-based black ink (layer 3a) is then applied on top of the oriented magnetic ink layer and cured, using the following G1 gravure printing unit. The ink layer is dried with the H2 hot air dryer unit. The gravure cylinder is chosen so as to deposit a typically 3 µm dry ink layer. c) A solvent-based white ink (Layer 4a) is then applied on top of the black ink on the next gravure printing unit G2 and dried with hot air dryer unit H3. The gravure cylinder is chosen so as to deposit a typically 3 µm dry ink layer. d) A solvent-based heat-adhesive layer (5c) is then applied on top of the white ink on the next gravure printing unit G3 and dried with the hot air dryer unit H4. The gravure cylinder is chosen so as to deposit an adhesive layer of typically 4 µm. Care must be taken to ensure that the coil temperature remains below the activation temperature of the adhesive. e) In an additional press pass, a solvent-based thermo-adhesive layer (5a) is applied on the other side of the PET film, using the G3 gravure printing unit, and dried with the air dryer unit hot H4. The gravure cylinder is chosen so as to deposit an adhesive layer of typically 4 µm. Care must be taken to ensure that the coil temperature remains below the activation temperature of the adhesive. f) The reel is finally cut into 3 mm wide fillets, which are placed on rollers for incorporation with window fillet in cotton-based security paper (during the paper production process).
    Figure 6B shows a specimen banknote printed on a substrate bearing a window thread produced as described above. Example 2
    In the second example, the description of a security thread comprising an optically variable magnetic ink layer between two thin plastic sheets is provided. The security thread has a cross section as illustrated in Figure 2. The first part, composed of layers 1a to 4a, is produced according to the sequence a) to ac) described in the previous example, except that a 12 μm PET film thickness is used in place of a 15 film to reduce the overall thickness of the final structure. The first part consisting of layers 1a to 4a is then laminated onto the second part consisting of an 8 µm PET film (1b) coated with a 4 µm thick adhesive laminating layer (5b). This lamination adhesive is a solvent-based polyotrethane system deposited onto the second PET film (1b) by gravure printing. In the final step, the thermoadhesive layers (5a and 5c) are applied on each side of the laminate by gravure printing (dry deposit typically 4 µm).
    The reel is finally cut into 3mm wide fillets, which are placed on rolls, to be incorporated as window fillets during the production of cotton-based security paper. Example 3
    In the third example, the description of the optically variable security thread that combines luminescent properties is provided. The security thread has a schematic cross section as depicted in Figure 3. The security thread is produced in the same manner as described in Example 1, except that a layer of fluorescent solvent based gravure ink (6a) is first applied about PET film. The gravure cylinder is chosen so as to deposit a typically 2 µm dry ink layer. The fluorescent pigment has to be chosen so as to withstand the subsequent thermal treatment that takes place during the incorporation of the thread into the security substrate. Its light scattering should still be low when incorporated into the ink matrix, so as not to interfere negatively with the optical effect layer (2a). A solvent-based paint formulation comprising 3% Lumilux CD 382 (Honeywell), Polyurethane (PU) and Polyvinyl Butyral (PVB) resins satisfies these requirements.
    The reel is finally cut into 3mm wide fillets, which are placed on rolls, to be incorporated as window fillets during the production of cotton-based security paper. Furthermore, for the optical color change effect, the thread shows a yellow luminescence under UV excitation of 366 nm. Example 4
    In the fourth example, the description of an optically variable magnetic thin sheet according to the present invention is provided. The safety thin sheet has a schematic cross section as illustrated in Figure 4. The thin sheet is produced according to steps a) to d) described in Example 1. The reel is finally cut into thin sheet 5 of 8 mm tapes. width, which can be heat stamped onto rolls of security substrate. Example 5
    This example describes the same fillet as described in Example 1, but produced with an alternative printing method. The dedicated press 10 as schematically illustrated in Figure 5 is used in the alternative configuration, in which magnetic orientation is performed using cylinder R. In this case, the ink layer containing magnetically oriented pigments is applied by the unit of gravure printing G1 and is hardened as the coil passes under the 15 hot air (H1) and UV (U1) dryer units. The ink is prepared according to formulation 2b provided in example 2 of document no. 2007/131833. A suitable gravure cylinder must be used in order to achieve a typical dry ink thickness of 18 µm. Subsequent layers are applied in additional steps using the G2 and G3 engraving units.
    权利要求:
    Claims (15)
    [0001]
    1. Security thread or tape, preferably for incorporation into or on a securities document or currency substrate, comprising a first thin plastic sheet (1a) bearing a first engraving which is a hardened structured coating (2a) on the symbol form and comprising oriented magnetic or magnetizable pigment particles, the orientation of said pigment particles representing graphical information, the security thread or tape being characterized by the fact that said graphical information is a repetitive pattern of suitable repeat length and the fact that the graphic information represented by the orientation of the pigment particles is different from the structured coating symbols.
    [0002]
    2. Security thread or tape, according to claim 1, characterized in that said magnetic or magnetizable pigment particles are chosen from the group consisting of optically variable magnetic thin-layer interference pigments.
    [0003]
    3. Security thread or tape, according to claim 1 or 2, characterized in that said hardened structured coating is comprised between said first thin plastic sheet (1a) and a second thin plastic sheet (1b) .
    [0004]
    4. Security fillet or tape, according to any one of claims 1 to 3, characterized in that the security fillet or tape is a laminated fillet or tape obtained by laminating in registration of said first thin plastic sheet (1a) bearing said first recording on the second thin plastic sheet (1b) bearing a second recording complementary to the first recording.
    [0005]
    5. Security thread or tape, according to any one of claims 1 to 4, characterized in that said hardened structured coating (2a) comprising magnetic or magnetizable pigment particles comprises additional security materials selected to from the group consisting of luminescent pigments and dyes, infrared absorbing pigments and dyes, and metallic, magnetic and interference pigments.
    [0006]
    6. Security thread or tape, according to any one of claims 1 to 5, characterized in that the security thread or tape comprises additional security materials selected from the group consisting of luminescent pigments and dyes, pigments and infrared absorbing dyes and in the metallic, magnetic and interference pigments comprised in at least one separate coating layer.
    [0007]
    7. Security thread or tape, according to any one of claims 1 to 6, characterized in that the security thread or tape additionally comprises a microlenses layer or a holographic layer selected from the holograms volume and surface holograms (symbols) metallized, demetallized or partially demetallized.
    [0008]
    A method of producing the security thread or tape as defined in any one of claims 1 to 7 for incorporation into a securities document or a currency substrate, comprising the steps of: a) coating a first plastic thin sheet (1a) with a coating composition comprising magnetic or magnetizable pigment particles as a structured coating (2a) in the form of symbols; b) orienting the magnetic or magnetizable pigment particles in the coating (2a) on the thin plastic sheet (1a) by applying a correspondingly structured magnetic field so that the orientation of said pigment particles represents graphical information; c) hardening the coating (2a) comprising the oriented magnetic or magnetizable pigment particles so as to fix the optically variable magnetic or magnetizable pigment particles in their respective positions and orientations and form a first engraving (2a); y) optionally applying an adhesive coating (5a) over at least one surface of the first thin plastic sheet (1a); and z) carving the first thin plastic sheet (1a) bearing said hardened coating (2a) comprising optically variable magnetic or magnetizable pigment particles in fillets or ribbons; the method being characterized by the fact that said graphical information is produced using a magnetic (M, R) orientation cylinder with a seamless repetitive magnetic field pattern of suitable repeating length and by the fact that the graphical information represented by the orientation of the pigment particles is different from the structured coating symbols.
    [0009]
    9. Method according to claim 8, characterized in that said magnetic or magnetizable pigment particles are chosen from the group consisting of optically variable magnetic thin-layer interference pigments.
    [0010]
    10. Method according to claim 8 or 9, characterized in that additional security materials selected from the group consisting of luminescent pigments and dyes, infrared absorbing pigments and dyes, as well as metallic, magnetic and color pigments interference are applied in at least one separate coating layer.
    [0011]
    11. Method according to any one of claims 8 to 10, characterized in that an additional microlenses layer or a holographic layer selected from volume holograms and surface holograms (symbols) metallized, demetallized or partially demetallized is applied.
    [0012]
    12. Method according to any one of claims 8 to 11, characterized in that it comprises the alternative or additional step of: e) laminating a second thin plastic sheet (1b) on the first thin plastic sheet (1a) carrying said hardened coating (2a), to produce a laminated structure, wherein said hardened coating (2a) comprising oriented magnetic or magnetizable pigment particles is comprised between said first and said second thin plastic sheet (1a, 1b).
    [0013]
    13. Method according to any one of claims 8 to 12, characterized in that a second thin plastic sheet (2a) carries a second recording complementary to the first recording on the first thin plastic sheet.
    [0014]
    14. Method according to any one of claims 8 to 13, characterized in that the engraving operation is performed with a printing method selected from the group consisting of gravure printing (G1, G2, G3 ) using a seamless notched printing cylinder, screen printing (S1) using a seamless rotating screen, and flexographic printing using an Anilox bearing/Doctor Blade ink.
    [0015]
    15. Use of a security thread or tape as defined in any one of claims 1 to 7, characterized in that it is on or on a paper or polymer substrate to make currency, securities documents, identification documents , transportation tickets and tax stamps.
    类似技术:
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    同族专利:
    公开号 | 公开日
    CA2791929A1|2011-09-09|
    EP2878451A1|2015-06-03|
    TN2012000433A1|2014-01-30|
    CU20120129A7|2013-02-26|
    AP2012006448A0|2012-08-31|
    JP2013522063A|2013-06-13|
    SG183463A1|2012-09-27|
    WO2011107527A1|2011-09-09|
    IL221363D0|2012-10-31|
    HK1175146A1|2013-06-28|
    ECSP12012122A|2012-09-28|
    CO6602130A2|2013-01-18|
    US9216605B2|2015-12-22|
    MA34021B1|2013-02-01|
    HUE028608T2|2016-12-28|
    US20130033032A1|2013-02-07|
    EP2542417B1|2015-11-11|
    PE20130619A1|2013-05-30|
    NZ602763A|2014-07-25|
    PL2542417T3|2016-04-29|
    US20160068004A1|2016-03-10|
    JP5948635B2|2016-07-06|
    BR112012021633A2|2017-02-07|
    KR20130036214A|2013-04-11|
    DK2542417T3|2016-02-08|
    CN102781675A|2012-11-14|
    EP2542417A1|2013-01-09|
    CL2012002407A1|2013-04-19|
    AU2011223000A2|2012-11-15|
    PT2542417E|2016-02-26|
    EA024013B1|2016-08-31|
    TW201202054A|2012-01-16|
    AU2011223000A1|2012-10-18|
    CN102781675B|2015-04-22|
    KR101745668B1|2017-06-27|
    AR080431A1|2012-04-11|
    EA201290831A1|2013-02-28|
    ZA201207319B|2013-06-26|
    CA2791929C|2017-12-12|
    AU2011223000B2|2014-03-06|
    MX2012009367A|2012-10-01|
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    法律状态:
    2018-04-10| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-10-01| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-10-27| B06A| Notification to applicant to reply to the report for non-patentability or inadequacy of the application [chapter 6.1 patent gazette]|
    2021-03-23| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-06-08| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 03/03/2011, OBSERVADAS AS CONDICOES LEGAIS. PATENTE CONCEDIDA CONFORME ADI 5.529/DF |
    优先权:
    申请号 | 申请日 | 专利标题
    IB2010000435|2010-03-03|
    IBPCT/IB2010/000435|2010-03-03|
    PCT/EP2011/053148|WO2011107527A1|2010-03-03|2011-03-03|Security thread or stripe comprising oriented magnetic particles in ink, and method and means for producing same|
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