EP0330733A1 - Elément de sécurité en forme de fil ou de bande destiné à être incorporé dans un document de sécurité et procédé pour sa fabrication - Google Patents

Elément de sécurité en forme de fil ou de bande destiné à être incorporé dans un document de sécurité et procédé pour sa fabrication Download PDF

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Publication number
EP0330733A1
EP0330733A1 EP88118460A EP88118460A EP0330733A1 EP 0330733 A1 EP0330733 A1 EP 0330733A1 EP 88118460 A EP88118460 A EP 88118460A EP 88118460 A EP88118460 A EP 88118460A EP 0330733 A1 EP0330733 A1 EP 0330733A1
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EP
European Patent Office
Prior art keywords
characters
security element
film
patterns
security
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Application number
EP88118460A
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German (de)
English (en)
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EP0330733B1 (fr
Inventor
Walter Dr. Schneider
Theo Dr. Burchard
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GAO Gesellschaft fuer Automation und Organisation mbH
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GAO Gesellschaft fuer Automation und Organisation mbH
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Priority to AT88118460T priority Critical patent/ATE100880T1/de
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
    • D21H21/42—Ribbons or strips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/355—Security threads
    • 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
    • B42D15/00—Printed matter of special format or style not otherwise provided for
    • B42D15/02—Postcards; Greeting, menu, business or like cards; Letter cards or letter-sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/373—Metallic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/43—Marking by removal of material
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
    • D21H21/44—Latent security elements, i.e. detectable or becoming apparent only by use of special verification or tampering devices or methods
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/003—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using security elements
    • B42D2033/08—
    • B42D2033/20—
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
    • D21H21/44—Latent security elements, i.e. detectable or becoming apparent only by use of special verification or tampering devices or methods
    • D21H21/48—Elements suited for physical verification, e.g. by irradiation

Definitions

  • the invention relates to a security element in the form of a thread or tape for embedding in security documents such as bank notes, checks, securities or the like with visually and / or machine-readable characters, patterns etc. visible in transmitted light, and to methods for producing security documents of this type.
  • security threads Papers of this type are referred to below as security papers.
  • the security threads used for this purpose consist of a wide variety of materials in the form of fine ribbons, which are inserted into the paper sheet during its manufacture in widths of 0.4 to 2 mm. They are mainly made of plastic films, which are coated with metal foils, printed, colored or z. B. are provided with pigment-shaped substances.
  • microprint images have proven to be particularly advantageous, this microprint being able to contain information which is readable by the eye or only machine-readable.
  • a security thread is now known from DE-AS 22 05 428, which, designed as a metal strip, has a machine-readable and / or visually readable coding introduced by means of a laser.
  • the labeling of this thread which may also contain alphanumeric characters, consists of through holes (perforations), the diameter of the holes or the “line width” should be small compared to the thickness of the metal strip in order to make it difficult to imitate it.
  • a security thread was also known which is to be used for banknotes and the like and on which shiny metallic micro characters are provided on clear, transparent film material.
  • the security thread described in this patent or the micro-characters on it are not recognizable in incident light. In transmitted light, however, only the characters can be recognized as sharply contoured characters, since the security thread itself is transparent.
  • Such a security thread is produced by vapor-coating a transparent film with a thin aluminum layer over a large area, then printing this layer with the micro-characters using an acid-resistant printing ink and then etching away the unprinted areas, whereupon the characters remain on a transparent background.
  • the invention is based on the object of creating a security thread with visually and / or machine-readable characters and patterns, after its embedding the thread structure as well as the characters and patterns are clearly recognizable in a document and its visual impression and security against forgery is improved.
  • the security thread consists of a transparent plastic film which is provided with a metal coating on one side. Characters are introduced into this reflective metal coating, which is opaque in transmitted light, by local removal of the coating material.
  • the thread is provided with a color coating that can extend over the entire surface of the thread.
  • the colorants used have no covering effect and are preferably glazing printing inks in various colors and tints.
  • the plastic film can also be colored with appropriate colorants in such a way that the transparency is retained in a part of the visually accessible spectrum.
  • the thread itself is easily recognizable as a dark stripe in the document and the characters and patterns stand out from their immediate surroundings, the opaque thread coating and additionally from the wider surroundings, the white paper or plastic material, as bright, colored areas.
  • the thread is in the documentary ment is easy to find and the characters are clearly recognizable due to their contrasting effect with the surroundings and can be read at any time with the appropriate font size, even without tools.
  • opaque coating materials are also other non-metallic layers which contrast in color and / or in gray tone when viewed in transmitted light, such as.
  • B. titanium nitride, interference layers such as z. B. are known from US-PS 3,858,977.
  • the luminescent colors can either be colorless in the non-excited state or have a body color that preferably differs from the color of the emission light.
  • the characters or patterns only appear colored in the excitation light or change their color when the thread, e.g. B. under UV light.
  • Several luminescent substances emitting in different colors increase both the design possibilities and the security against forgery, since the analysis of each individual luminescent substance is necessary for exact imitation. This analysis can easily go further sword by mixing the different luminescent colors or printing them overlapping.
  • diffraction structures are e.g. B. as volume or embossed holograms directly as embossments in the carrier material of the plastic thread before or in an additional layer.
  • the reflective metal layer present in the case of reflection holograms or gratings is preferably interrupted here for the generation of a lettering or pattern visible in transmitted light by one of the methods mentioned below.
  • Such a thread is preferably embedded in the document in such a way that it is at least partially directly visible or appears on the surface.
  • Methods for embedding in the security under window formation in the security thread area are e.g. B. known from DE-OS 36 01 114. With a thread embedded in this way, the hologram diffraction grating or reflection pattern is predominantly visible in the reflection in the window area, while when viewed in transmitted light, the negative writing or negative pattern incorporated in the metal coating dominates.
  • the means known in principle from printing technology are used for the creation of the characters and patterns, and the characters and patterns are printed onto the metal-coated side of the film using known microprinting methods.
  • a printing ink is used which, for. B. has thermoplastic properties, d. H. softens and becomes sticky at higher temperatures. If a film pretreated in this way is laminated against a second untreated film web using heat and pressure, the two films adhere to one another in the area of the printed characters or patterns. When the two films, which have cooled in the meantime, are separated, the areas corresponding to the characters or patterns are then released from the aluminum coating. In this way, a metal material is deposited on the foil material, in which characters or patterns in the form of translucent colored dots or lines are obtained in the otherwise opaque light-reflecting surface.
  • the film provided for the production of the security thread is first provided with a primer in the form of a printing ink and then the vapor deposition is applied to this primer.
  • the primer can be applied in the form of a colored and / or luminescent surface.
  • this colored primer can also be designed in the form of a multicolored printed image.
  • B. results in a random distribution in the coloring of the individual characters. This makes it possible to create threads that have a micro script that shimmers in many colors and appears bright on a black background.
  • the film material can first be provided with the colorless primer, while the colored, transparent ink layer is applied to the opposite side of the film. This process offers advantages if different printing ink qualities have to be used for primer and colored transparent layers. After metal vapor deposition of the primer can continue in the above form.
  • the known hot stamping method can also be used advantageously for the selective metal coating of colored or printed security threads.
  • This method can be used particularly advantageously in connection with "light collecting foils", so-called LISA foils, as foil material.
  • LISA foils have the property of "collecting” incident light and allowing it to emerge in a certain color and only in edge areas or at imperfections on the surface (embossing). Since the characters or patterns are to be embossed into the film for the hot embossing process and these embossed structures represent such defects, the characters appear with a luminous edge contour. With LISA films with daylight fluorescent properties, colored light effects are also visible in daylight.
  • a printed image is first printed on the foils, as it will later appear as a negative image in the metal coating, and only in a second process step is the opaque coating z.
  • B. applied the metal coating For the application of the printed image, printing inks or varnishes are used which have little adhesion either to the film and / or to metal coatings, so that either the metal coating alone or together with the printing ink can only be removed mechanically in an air or liquid jet.
  • This method is used for the production of packaging materials and is known in principle from DE-OS 36 10 379. Instead of the liquid jet, removal of the poorly adhering printing ink can also be achieved by mechanical scraping devices.
  • the process is to use printing inks, which can then be chemically dissolved under the metal coating.
  • the dissolving of the printing ink is generally not completely sufficient for a complete removal of the metal layer in the entire printing area.
  • an ultrasound source is introduced into the solution bath or the film is drawn through an ultrasound bath after the solution bath, the printing film is completely removed in a simple process.
  • printing inks are used which become brittle during drying. If you pull the printed and then metal-coated colors through an ultrasound bath, these colors are removed even without a chemical solution process solely by the action of the ultrasound fur, which creates the desired negative lettering in the metal coating. Suitable colors are z.
  • the ultrasonic bath is in this case a liquid container with an ultrasound generator arranged therein or thereon, the liquid taking over the role of the coupling medium and in the simplest case water can be used for this.
  • Fig. 1 shows a security thread 1, consisting of a plastic tape 2 (Fig. 2) made of a tear-resistant plastic material, such as. B. polyester, one surface of which is provided with an opaque coating 3.
  • the coating is preferably a reflective metal layer, e.g. B. aluminum layer, or a white opaque, in opaque appearing, color application that has the recesses 4 in the form of the signs and patterns to be applied to the security thread.
  • this coating is not visible in incident light after the thread has been embedded in security paper 5 (FIG. 2), since the light reflected from the metal surface is again diffusely scattered in the paper or the white color layer does not stand out from the white paper mass.
  • the recesses in this opaque coating can only be recognized as bright areas when viewed in transmitted light.
  • the plastic film 2 is colored with preferably organic dyes, which reduce the translucency of the film in a part of the visually accessible spectrum.
  • Films with similar properties are used e.g. B. used in optics as a filter.
  • the characters appear in a certain color when viewed in transmitted light and not only stand out from the opaque black coating, but also contrast in color with the usually white paper layer.
  • the dyes can be supplemented or also replaced by luminescent substances, so that the characters light up in color or appear in a different color only when stimulated accordingly. If the luminescence is sufficiently strong, the thread is also visible in incident light. When looking at the thread from the side of the metal coating, the characters are recognizable, while when viewed from the opposite side and the arrangement of the excitation light source, the thread is visible as a homogeneous fluorescent band on the observer side. This property can be used as a further authenticity indicator.
  • a completely transparent film can also be provided with a color layer 8 which, for. B. on the the surface opposite the metal coating 3 is applied (FIG. 3) or is introduced as a primer layer between the metal layer and the film (FIG. 4).
  • This color layer 8 makes it possible to apply a multicolored printed image in any pattern, as a result of which the characters also appear in different colors and patterns.
  • Commercial, crystal-clear transparencies can then be used as foils.
  • the print samples can be adapted to the respective application. So it offers z. B. on security threads that are embedded in banknote paper, select the colors according to the respective national colors.
  • FIG. 5 shows a further embodiment, in which the colorants and / or luminescent substances 9 are only present in the area of the cutouts 4 of the metal coating 3. Suitable colorants are z.
  • Fig. 6 shows a security thread, consisting of a transparent plastic film 7 and a cover layer 30 in the form of an optical interference filter as z. B. is known from US-PS 3,858,977.
  • This cover layer has local interruptions 31 to represent a pattern, characters, numbers, etc.
  • This interference filter has the property that the color changes when changing reflections in transmission.
  • the thread preferably being stored in such a way that it appears at least partially on the surface, the pattern or the lettering is in each case against a differently colored background when viewed in reflected and transmitted light reason visible. If the film 7 is colored in a third color or an additional layer of color is applied, there is a color interplay of these colors and the mixed colors.
  • the security thread can also with optically varying structures such.
  • the carrier material is a tear-resistant embossable plastic film 40, and composite films can also be used to achieve these two properties.
  • This film is provided with a reflective opaque metallic coating 41, into which a negative lettering or pattern is preferably introduced by one of the methods mentioned below.
  • the optically active structures 43 such as. B. holograms, diffraction structures, reflection patterns in the form of the document plane differently inclined surfaces etc. imprinted in the metal-coated surface.
  • An additional transparent protective layer 44 protects these structures and the metal coating against external mechanical and chemical influences.
  • the thread is stored in such a way that the thread at least partially comes to the paper surface.
  • Procedures for this are e.g. B. already known from the writings mentioned.
  • security threads can, if necessary, be embedded in the document paper as so-called window security threads using one of these methods.
  • a z. B. colored, transparent film is first printed with the printed characters and then the film is exposed over the entire surface of a metal vapor deposition. If the printing ink is selected so that the adhesive effect between the printing ink and the plastic film is less than the adhesive effect between the metal vapor deposition and the film, the metal coating in the printed areas can be removed with the aid of an adhesive tape of suitable adhesive strength.
  • a 23 ⁇ m thick polyester film (eg Melinex from ICI) is printed using the gravure printing process using the gravure printing ink shown below. Then the printed film is vapor-coated with aluminum with a thickness of 1 ⁇ m. Finally, the vapor-coated film is pressed against a commercially available adhesive tape, the locations of the vapor deposition corresponding to the characters being torn out at the previously printed locations because of the low adhesion of the aluminum layer there. In this way, a color-transparent lettering or sign appears on the otherwise opaque aluminum layer.
  • the printing ink corresponds to the wording below. 100 g ethyl alcohol 20 g Movital B20H (Hoechst company) 0.3 g of an alcohol-soluble dye (e.g. neozapone blue from BASF).
  • a further method serving as a carrier film, for. B. colored, transparent plastic film 2 made of polyester first over the entire surface on at least one surface with a metal coating 3, z. B. aluminum.
  • the desired characters and patterns are printed on this coating, a thermoplastic plastic ink being used as the printing ink 11, which in the softened state has an adhesive effect and binds intimately to the metal coating (FIG. 8a).
  • d. H When the thermoplastic printing ink hardens again, the adhesive effect between the printing ink and the metal coating should be greater than between the metal coating and the carrier film.
  • the film 2 pretreated in this way is laminated under heat and pressure to film 12, to which the thermoplastic printing ink 11 also adheres well, and if these two films are separated after cooling, the metallic coating 3 is also removed locally with the printing ink 11 (FIG. 8b). .
  • the metal coating 3 remaining on the security thread 1 then shows the cutouts 4 corresponding to the characters and patterns (FIG. 8c).
  • Suitable printing inks and the process parameters to be observed can be derived from the following description of specific examples.
  • a polyester film 23 ⁇ m thick (eg Hostaphan from Hoechst) is coated over the entire surface with the formulation given in Example 4. Then sourced an aluminum layer of 1 micron thickness is applied to this formulation by vapor deposition. Finally, characters or symbols are printed on the vapor-coated layer using an intaglio cylinder, using the following hot-melt printing ink. 100 g distilled water 60 g Vinnol dispersion 50/25 C (from Wacker) 1 g Tylose MH 16000 K (Hoechst company).
  • the material can either be rolled up first and then processed later, or the next processing step can be added immediately without rolling up.
  • the printed film is pressed against an otherwise untreated hostaphane film of the same type and the press rolls are heated to a temperature of 160.degree.
  • the pressed film combination is then passed over a chill roll and then both films are separated and rolled up separately.
  • the hot pressing process the aluminum-vapor-coated layer sticks to the additional polyester film with the help of the hot-adhesive printing characters.
  • the parts of the aluminum coating corresponding to the characters are torn out and allow the desired lettering or characters to appear transparently in the otherwise opaque aluminum layer.
  • a correspondingly colored plastic film can be used, or the film can be provided with a single or multi-colored layer of color with or without luminescent properties before or after the characters are applied.
  • a polyester film (eg Melinex from ICI) is first vacuum-coated with an approximately 1 ⁇ m thick layer of metallic nickel. The vapor-coated film is then printed on the opposite side with a four-color pattern using common gravure inks. Finally, in the same printing process or in a second printing process that is attached later, the nickel-coated side is printed with colorless characters using the previously mentioned hot-adhesive printing ink. The film printed in this way is hot pressed with the metal-vapor-coated side against a second polyester film, then cooled and then the two films are separated again. The metallic nickel is torn out at the areas printed with the hot-adhesive paint, so that the characters printed with this paint appear as brightly transparent areas in the otherwise opaque thread. At these points the four-color printing on the back can be seen, so that a multicolored pattern is created in the transmitted light, which is practically not visible in the incident light on the metallized side, and is weakly recognizable as a colored band on the opposite side.
  • a 23 ⁇ m thick polyester film (e.g. Hostaphan from Hoechst) is vacuum coated on one side with 1 ⁇ m aluminum.
  • the opposite side of the film is printed over the entire surface in an intaglio printing process with a printing ink which is colorless in daylight but light blue under UV light.
  • the metallized side of the film is printed with a hot-melt ink according to the previous example.
  • the subsequent hot pressing, cooling and cutting of the foils in turn create transparent characters in one otherwise opaque web, which can be seen in transmitted light as brightly colorless typefaces or patterns. If you embed such a material e.g. B. in a banknote paper, it will be practically invisible from both sides of the paper in the striking light. A dark stripe appears in the transmitted light, in which the characters appear bright. If you additionally illuminate with ultraviolet light, the material introduced appears bright blue on one side, while on the other side, blue illuminated signs appear in the transmitted UV light.
  • Another method which allows the creation of bright-looking fonts on otherwise less translucent and therefore dark-looking surrounding material in the simplest possible way, consists in a carrier material, for. B. a polyester film of commercial quality, first to print with the desired characters and then to provide a metal coating. The film thus produced is then passed through a solvent which can dissolve the printing ink. Appropriate solvents can easily penetrate the metal layer and penetrate into the ink layer underneath. This causes the printing ink to swell and then dissolve under the metallized layer. The sole action of the solvent usually does not lead to the desired success. It has now been found that the dissolving effect is effectively supported if an ultrasonic field is simultaneously irradiated into the solvent bath, which acts directly "acoustomechanically” on the color and also ensures thorough mixing and swirling of the bath.
  • printing ink only has to be used for the actual bright-looking characters appearing in the printing and the removal of the printing ink can be accomplished practically simultaneously or directly in succession using solvent and ultrasonic energy.
  • the pollution of the environment with chemicals can be kept particularly low in this way.
  • the substances contained in the printing ink can be separated off by precipitation or evaporation and, if necessary, reused.
  • the solvents can of course be reused after vapor deposition and also do not pollute the environment.
  • the amounts of substance resulting from the applied metal layer are small and can also be removed in a simple manner by filtration.
  • Another advantage is that fine lettering with very well-defined edges can be obtained while the rest of the surface remains completely intact.
  • the materials produced in this way therefore have a particularly well-defined and error-free appearance, which is particularly advantageous when used as security elements with micro-writing.
  • the printing inks used to produce the characters can be of the simplest formulation.
  • Printing inks of this type need in no case have any special properties or durability, compatibility, acid or alkali resistance, since they only are temporarily needed in the manufacturing process and their only purpose is to redissolve in the solvent. It is therefore sufficient to use an inexpensive, conventional binder for printing inks.
  • any lettering is printed on a polyester film of the type RGH 23 (manufacturer Hoechst) using the gravure printing process.
  • the film printed in this way is then vacuum-coated with aluminum in a thickness of 0.2 ⁇ on the printed side.
  • ethyl alcohol is added to an ultrasonic bath and the ultrasonic generator is switched on.
  • the printed and vapor-coated film is immersed in the ethyl alcohol for one second and then removed and dried. It follows that the printing ink and the aluminum present above have been removed from the printed areas and only at these locations. In an otherwise opaque surface, the film has the lettering as clear, transparent areas.
  • the hot stamping process known per se can also be used to produce security threads according to the invention (see plastics 72 (1982), 11 "hot stamping, a modern process for decorating plastic parts" by H. Schütt and B. Seeberger, Marieth, pages 701-707) .
  • the characters and patterns are first embossed into the plastic films 13 (FIG. 9), so that these are present as recessed areas 17 in the film surface.
  • the metal coating 15 of a transfer belt 16 is then transferred to the raised area 17 of the plastic film surface with the aid of a heated silicone embossing roller (not shown in the figure) (FIG. 9a).
  • the lower-lying areas 14, which represent the characters, are left blank by a coating 18 (FIG. 9b).
  • the plastic film 13 can be colored again or preferably be provided with corresponding printed patterns on the back.
  • the hot stamping process also allows the use of sublimable colors, which evaporate during transfer and penetrate into the plastic film material. This significantly improves liability.
  • LISA foils can also be used in a preferred form (plastics 75 (′85) 5, “plastics that collect light”, pages 296-297, Dr. A. El Sayed). These LISA foils are characterized in that they mostly contain luminescent substances that can be activated by daylight and that the "collected" light can only emerge in the edge area or at imperfections on the surface. Such defects are e.g. B. the edge areas of the embossed characters.
  • LISA foils as carrier foil for the security thread and coats them after the hot stamping process with an opaque metal or color layer with the exception of the recessed character areas, these characters not only appear as bright characters against the opaque background, but shine brightly in the edge area on, this light phenomenon can be varied by appropriate choice of the LISA film or the luminescent substances contained therein in the color, intensity and the necessary ambient light (daylight, UV).
  • wide film webs are preferably first coated and labeled in the desired security thread pattern. Only after these process steps have been completed are the film webs cut into individual threads. Methods for register-accurate printing and cutting of these films are e.g. B. from EP-A 0 238 043 known.
  • the opaque coating 3 is in the edge area in the form of a machine-readable coding 20 z. B. interrupted in the form of a regularly repeating bar pattern.
  • This coding can be applied in addition or as a replacement for the human-readable lettering 21.
  • the information introduced via this coding can, for. B. the banknote value or also a random information by which the thread is individualized. By linking this random information with other document and / or user-specific data, this thread - in a form that can no longer be exchanged - is bound to the respective document and / or user.
  • the thread according to the invention has a constant thread width, since here only the thin opaque coating, but not the thread or plastic carrier, is varied in width.
  • the coding which can be printed on a transparent plastic film by one of the aforementioned methods or in a simple manner, is perfectly legible in transmitted light due to the transparency of the film material and the opacity of the coating in the same way as a cut thread.
  • the transparent (not printed) film area stands out as a negative coding pattern, which runs parallel to the opaque coding.
  • luminescent colors that are only luminescent with UV light or other special light sources, this color effect only appears with special lighting.
  • this thread does not differ from the known cut version for the viewer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Credit Cards Or The Like (AREA)
  • Printing Methods (AREA)
  • Paper (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Decoration Of Textiles (AREA)
EP88118460A 1988-03-04 1988-11-04 Elément de sécurité en forme de fil ou de bande destiné à être incorporé dans un document de sécurité et procédé pour sa fabrication Expired - Lifetime EP0330733B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88118460T ATE100880T1 (de) 1988-03-04 1988-11-04 Sicherheitselement in form eines fadens oder bandes zur einbettung in sicherheitsdokumente sowie verfahren zur herstellung desselben.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3807126 1988-03-04
DE3807126 1988-03-04

Publications (2)

Publication Number Publication Date
EP0330733A1 true EP0330733A1 (fr) 1989-09-06
EP0330733B1 EP0330733B1 (fr) 1994-01-26

Family

ID=6348885

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88118460A Expired - Lifetime EP0330733B1 (fr) 1988-03-04 1988-11-04 Elément de sécurité en forme de fil ou de bande destiné à être incorporé dans un document de sécurité et procédé pour sa fabrication

Country Status (8)

Country Link
US (1) US6474695B1 (fr)
EP (1) EP0330733B1 (fr)
KR (1) KR930003329B1 (fr)
AT (1) ATE100880T1 (fr)
DE (1) DE3887497D1 (fr)
ES (1) ES2048186T3 (fr)
FI (1) FI95736C (fr)
WO (1) WO1989008166A1 (fr)

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EP2886356A2 (fr) 2013-11-21 2015-06-24 Giesecke & Devrient GmbH Procédé de fabrication d'un document de valeur et d'un élément de sécurité, document de valeur et élément de sécurité ainsi obtenus et dispositif d'exécution du procédé
EP3140127B1 (fr) 2014-05-07 2020-02-12 OVD Kinegram AG Élément multicouche et procédé pour le fabriquer
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US10583681B2 (en) 2016-10-14 2020-03-10 Lumenco, Llc Method of manufacturing items with lens-based security features using multiple lenses dedicated to individual colors
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Also Published As

Publication number Publication date
US6474695B1 (en) 2002-11-05
EP0330733B1 (fr) 1994-01-26
DE3887497D1 (de) 1994-03-10
KR930003329B1 (ko) 1993-04-26
ES2048186T3 (es) 1994-03-16
FI95736B (fi) 1995-11-30
WO1989008166A1 (fr) 1989-09-08
FI95736C (fi) 1996-03-11
ATE100880T1 (de) 1994-02-15
FI894957A0 (fi) 1989-10-18
KR900700692A (ko) 1990-08-16

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