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EP1159723B1 - Safety adhesive foil as identification element - Google Patents

Safety adhesive foil as identification element Download PDF

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Publication number
EP1159723B1
EP1159723B1 EP00910629A EP00910629A EP1159723B1 EP 1159723 B1 EP1159723 B1 EP 1159723B1 EP 00910629 A EP00910629 A EP 00910629A EP 00910629 A EP00910629 A EP 00910629A EP 1159723 B1 EP1159723 B1 EP 1159723B1
Authority
EP
European Patent Office
Prior art keywords
security film
substrate
identification medium
film
security
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP00910629A
Other languages
German (de)
French (fr)
Other versions
EP1159723B8 (en
EP1159723A1 (en
Inventor
Bernhardt Dilz
Arne Koops
Petra Lawrence
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tesa SE
Mercedes Benz Group AG
Original Assignee
DaimlerChrysler AG
Tesa SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by DaimlerChrysler AG, Tesa SE filed Critical DaimlerChrysler AG
Publication of EP1159723A1 publication Critical patent/EP1159723A1/en
Publication of EP1159723B1 publication Critical patent/EP1159723B1/en
Application granted granted Critical
Publication of EP1159723B8 publication Critical patent/EP1159723B8/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D79/00—Kinds or details of packages, not otherwise provided for
    • B65D79/02—Arrangements or devices for indicating incorrect storage or transport
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S283/00—Printed matter
    • Y10S283/901—Concealed data
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/916—Fraud or tamper detecting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/14—Layer or component removable to expose adhesive
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/14—Layer or component removable to expose adhesive
    • Y10T428/1405—Capsule or particulate matter containing [e.g., sphere, flake, microballoon, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/14—Layer or component removable to expose adhesive
    • Y10T428/1471—Protective layer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer

Definitions

  • the invention relates to a writable security adhesive film containing a diffusive identification medium. If the film is adhered to a substrate, the identification medium results in a permanent marking of the substrate.
  • Security films and security labels play a major role in marking theft-sensitive or safety-relevant workpieces and documents. They are glued to the object to be secured and are only with great effort to copy and / or remove from the object surface, the substrate.
  • security films and labels whose labels are permanently detectable even after removal of the film or the label on the underlying substrate: they force the thief or counterfeiter to elaborate rework to erase the traces of the label on the substrate and / or to produce a fake label of the substrate. Thus, they significantly reduce the attractiveness of theft or counterfeiting.
  • the security film is provided with a diffusive identification medium which, after the film has been glued, migrates into the underlying substrate, causing it to undergo a physical and / or chemical reaction.
  • US Pat. No. 5,346,738 discloses a security label which contains an acid in microencapsulated form as the identification medium. If a pressure is exerted on the label, in particular by the adhesion process to an object, the encapsulation breaks, the identification medium is released and diffuses to the substrate surface, where it causes a corrosive reaction.
  • the labeling process is an integral part of the chemical / technical manufacturing process of the label and must therefore take place at the label manufacturer.
  • the labels can be inscribed in-house and as short as possible, and the inscription pattern can be redesigned as needed to ensure the highest possible counterfeit security.
  • Another disadvantage of these labels is that the labeling of the label top is done in a further, separate process step, which makes the process consuming and error prone.
  • a security label which contains an adhesive layer with a diffusive identification medium. Labeling of the label is effected by a barrier medium which, according to the inscription, is selectively applied to the adhesive layer so as to partially mask the side facing the substrate. If the label is adhered to the substrate, the barrier medium should locally prevent or reduce the diffusion of the identification medium from the adhesive layer to the substrate, while unimpeded diffusion should take place in the regions free of the barrier medium.
  • the label of the labels i. the order of the barrier medium can be carried out by the user in-house; however, this is an error-prone process because it must be ensured that the label does not compromise the durability and adhesive properties of the label. That is why these safety labels are only of limited use for use in the factory environment.
  • US Pat. No. 4,841,652 shows a security film with a carrier layer to which an adhesive layer with a diffusible identification medium is applied.
  • a barrier layer is arranged between carrier layer and adhesive layer, which prevents the identification medium from penetrating into the carrier layer.
  • EP 845 767 A1 discloses a security label having an adhesive layer containing an identification medium dispersed therein.
  • the label is adhered to a substrate surface by means of the adhesive layer.
  • the activation of the identification medium takes place by local removal of the adhesive layer, for example by selective cutting or burnout, by selective displacement of the adhesive layer due to pressure application or laser ablation or by selective application of a polymer layer to the substrate side of the adhesive layer.
  • the invention has for its object to provide a durable, easy and fast to be inscribed in the factory field security film that also makes it difficult to falsify the identity of the products to be secured in case of theft.
  • the security film contains a carrier layer in which an identification medium is contained.
  • an identification medium is contained.
  • the diffusion properties of this identification medium can be specifically selectively and locally changed. If the security film labeled in this way is adhered to a workpiece, the identification medium diffuses toward the substrate surface, where it causes a detectable reaction. In this case, this diffusion or reaction takes place only in those areas of the substrate surface in which the diffusion capability was triggered or not obstructed by the inscription process.
  • the security film allows a clear labeling and identification of the workpiece.
  • the security film is labeled according to the invention by means of a non-contact method.
  • the labeling of the security film - and thus the change of the diffusion properties of the identification medium - can be done in particular by means of electromagnetic radiation.
  • Particularly advantageous for labeling the security film is the use of a laser, by means of which both a temperature-sensitive and a light-sensitive labeling can take place (the term "light” in this case, the entire laser-accessible range of the electromagnetic spectrum comprises).
  • Lasers have the additional advantage of allowing high-contrast labels with any choice of pattern, allowing rapid changes in the pattern of the label, and being process reliable in the factory environment.
  • the identification medium a substance is selected which triggers a detectable reaction on the substrate.
  • the identification medium must be adapted to the material properties of the substrate.
  • the identification medium may contain a dye, which is adapted to the substrate and which locally diffuses into the substrate surface and dyes it.
  • the identification medium may include a substance that undergoes a chemical reaction with the substrate surface.
  • an identification medium containing a corrosive substance is recommended for the marking of metallic substrates.
  • an identification medium whose influence on the underlying substrate is not visible to the naked eye. This can be accomplished with an identification medium that exhibits the absorption and reflection properties of the substrate, e.g. only in the UV or IR range, but not affected in the visible range. If a thief or counterfeiter removes the film, the substrate will not contain any visible traces of the marking, and the thief or counterfeiter will not see any need to scrape or paint over the substrate surface in the affected areas. The affected areas still contain the markers which are simply displayed by informed security forces using e.g. a UV or IR viewing device can be detected.
  • the identification medium can be chosen so that the detectability, for. As the UV fluorescence, takes place only at certain wavelengths of the test light.
  • the film For industrial use of the security film, especially in the automotive industry, the film must have a high resistance to temperature and light. These requirements can best be met if the security film has physical barriers which inhibit the diffusion of the identification medium in the unrecorded state of the film. During the labeling process, these barriers are locally destroyed or weakened, so that selective diffusion of the identification medium can take place in the regions thus weakened. In order to achieve a high temperature or light resistance of the lettering, the temperatures or light intensities required for the destruction of the barriers must be substantially higher than those to which the object to be marked in use - even under extreme environmental conditions - subject.
  • Such a diffusion inhibition of the identification medium, which can be canceled by a non-contact labeling can be realized by a micro-encapsulation of the identification medium in the carrier layer.
  • the identification medium is enclosed in capsules whose walls are e.g. made of wax and / or fat and e.g. can be broken by the local influence of heat in the affected areas of the film, so that the identification medium contained therein escape and - in contact with the substrate - diffuse into this or can react with it.
  • a particularly high temperature resistance of the label can be achieved if the barrier is formed by a barrier layer which is arranged flat between the carrier layer and an adhesive layer and which prevents the diffusion of the identification medium from the carrier layer in the unlabeled state of the film.
  • the barrier layer is locally broken, so that the identification medium at these breakthrough sites escape locally from the carrier layer and diffuse into the adhesive layer.
  • the film with the adhesive layer is adhered to a substrate, selected regions of the substrate surface come into contact with the diffused identification medium and undergo a chemical or physical reaction.
  • the areas of the barrier layer which remained intact in the inscription effectively prevent the diffusion of the identification medium and thus a reaction in these non-inscribed areas.
  • an identification medium can be selected which is present in diffusible form in the unlabeled security film but is locally fixed in the course of the inscription ,
  • the carrier layer may represent a type of matrix in which the identification medium is embedded.
  • the substance of the carrier layer itself may be the identification medium, so that the carrier layer consists of identification medium.
  • the inscription of the security film embossed on the carrier or barrier layer is not only visible on the substrate but also on the film itself.
  • the labeling is carried out together with the labeling of the identification medium in the same process step.
  • the use of a multilayer laser-inscribable cover layer proves to be particularly favorable.
  • the unlabeled label is first glued to the object surface; then the non-contact label, through which the identification medium is released and the permanent marking of the object surface is triggered.
  • This Beschriftungsabtauf has the advantage that the label takes place directly on the object to be protected, so a mis-marking of the object can be excluded by permutation of labels.
  • undesired damage can occur, in particular on sensitive object surfaces, as a result of the selected labeling process-for example due to the heat development of the marking laser.
  • the security label is expediently initially separate labeling, whereby the identification medium is released locally; then the so-labeled label is glued to the object.
  • the security film according to the invention is particularly suitable for marking motor vehicles that are highly vulnerable to theft.
  • the marking allows at any time a clear identification of the vehicle. It is also advisable to mark expensive and particularly theft-endangered components and equipment of the vehicle separately in order to be able to prove their identity independently of the vehicle itself.
  • an identification medium is expediently used, which is detectable with the vehicle paint - albeit u.U. reaction that is not visible to the naked eye.
  • the barrier layer 6 is a continuous, for the Identifitechnischsmedium 3 impermeable layer. It spans a barrier area 9, which is at least as large as the labeling area 9 ', which is provided for the labeling of the label 2. Conveniently, the barrier layer 6 extends over the entire surface of the label 2 and thus ensures that before the lettering Nowhere on the label 2, a diffusion of the identification medium 3 from the carrier layer 4 in the adhesive layer 7 takes place.
  • the carrier layer 4 consists of a resin-modified acrylate adhesive. It contains as the identification medium 3 a migratory substance which serves as a carrier for a UV fluorescent dye.
  • the carrier film is admixed with a UV pigment of 1 to 3% (for example C luminescent pigment for securing against forgery of documents or products such as Y 2 O 2 S: Eu) and additionally contains 3 to 6% dibutyl phthalate carrier.
  • the barrier layer 6, which impedes the migration of the carrier molecules and luminescent pigments, is formed by a thin, transparent plastic film, for example a 12 to 25 ⁇ m thick polyacetate film.
  • the adhesive layer 7 consists - as well as the carrier layer 4 - of an adhesive based on a resin-modified acrylate polymer.
  • the cover layer 5 consists of a multilayer film, as described for example in the utility model DE 81 30 861. This cover layer 5 can be labeled with the aid of a laser 10, the upper lacquer layer 11 being removed, so that locally the underlying lacquer layer 12 comes to light.
  • the inscription of the label 2 is the process in which locally a diffusion of the identification medium 3 from the carrier layer 4 into the adhesive layer 7 is made possible. This is done by a targeted local weakening of the barrier layer 6.
  • the laser radiation for this penetrates both the cover layer 5 and the support layer 4 and thus must have sufficient power after penetration of these two layers to break the barrier layer 6 locally or to weaknesses.
  • a barrier layer 6 made of polyacetate film is used, then this film is locally destroyed by the usual cutting process used to inscribe the cover film with the aid of a laser 10 and allows a migration of the identification medium 3 into the adhesive layer 7 at these holes 13.
  • the laser power used for labeling must be selected to be correspondingly high.
  • the barrier layer 6 must have a sufficiently high absorption capacity for the radiation.
  • the barrier text 6 can also take place from the direction of the adhesive layer 7.
  • release paper 8 and adhesive layer 7 must be sufficiently transparent to the laser radiation.
  • the lettering train may e.g. consist of letters, numbers or an alphanumeric string.
  • the inscription strip can also have a bar code, a graphic symbol, a company logo and / or a mixture of several of these character classes.
  • the security label 2 can now be glued onto a substrate 14 (see FIG. 1c). For this purpose, it is removed from the release paper 8 and pressed with the now released bottom 15 of the adhesive layer 7 on the substrate 14.
  • the identification medium 3 diffused through the holes 13 of the barrier layer 6 and through the adhesive layer 7 now comes into contact with the substrate surface 16.
  • the (UV) luminescent pigment contained in the identification medium 3 causes a local (UV) coloring of the substrate surface 16 and thus an image 17 of the labeling pattern, the example can be detected by means of a UV lamp.
  • the material properties of the identification medium 3 must be matched to those of the substrate 14. If a visible dye whose color matches the color of the substrate surface 16 is selected as the identification medium 3, the deciphering of the label can be carried out with the naked eye. Has the identification medium 3 z. For example, as a corrosive effect on the substrate, the inscription results in a local change in the reflective properties of the substrate surface 16, which may be e.g. can be detected with optical methods (in particular with grazing incidence of light).
  • an identification medium 3 may be selected which leaves no visible traces on the substrate 14, but whose presence on the substrate surface 16 can be detected chemically by wetting the substrate surface 16 with a suitably chosen substance which exhibits a detectable by physical means chemical reaction with the identification medium is received (eg an envelope of the pH, which manifests itself in a color change of the wetting substance).
  • the identification medium 3 may contain a magnetic marker; the local magnetization of the substrate 14 produced by the label can then be deciphered by applying a magnetically active analyte.
  • the security label 2 produced from the security film 1 according to the invention is suitable in the automotive industry, in particular for marking bodies.
  • the security label 2 for example, on the outer skin, frame and / or chassis a clear vehicle identification is possible.
  • the identification medium 3 is suitably chosen so that it leaves detectable traces on the vehicle paint.
  • vehicle components and facilities can also be marked. This is recommended in particular for components that are particularly vulnerable to theft (car radio, car phone) or particularly susceptible to forgery (expensive equipment, expensive safety-relevant parts).
  • the properties of the identification medium 3 and the adhesive layer 7 determine how fast the diffusion of the identification medium 3 through the adhesive layer 7 on the substrate 14 takes place and thus determine a relaxation time, after the expiration of a detectable marking of the substrate 14 has taken place.
  • This relaxation time is strongly temperature-dependent. For the reaction of the above-described film on an automotive finish, this relaxation time at room temperature is about 2 hours. If the label 2 remains substantially shorter than the relaxation time on the substrate 14, it can be removed without a detectable marking of the substrate surface 16 having occurred. Thus, within the relaxation time, it is possible to replace a wrongly affixed label with a proper label.
  • This effect leads to a certain fraying of the contour of the inscription pattern 17 on the substrate 14.
  • the laser inscription of the security label 2 can also be effected only after the label 2 has been glued to the substrate 14.
  • the laser power set for labeling must on the one hand be selected to be so high that the local destruction of the barrier layer 6 is assured in a process-reliable manner;
  • laser marking must not damage the substrate.
  • a label of the already glued label 2 thus requires a good control of the laser power and is only applicable to selected substrates 14.
  • the above-described inscription of the cover layer 5 can also take place in a separate process step, independently of the local destruction of the barrier layer 6, when the two inscription processes are triggered by radiation in different electromagnetic spectral ranges. In particular, it is also possible to completely dispense with a labeling of the cover layer 5.
  • the security film 1 can continue to be e.g. in the form of adhesive tape, cover, decorative and protective film, etc. are used.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Credit Cards Or The Like (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)

Description

Die Erfindung betrifft eine beschriftbare Sicherheits-Klebefolie, die ein diffusionsfähiges Identifikationsmedium enthält. Wird die Folie auf ein Substrat aufgeklebt, so erfolgt durch das Identifikationsmedium eine dauerhafte Markierung des Substrats.The invention relates to a writable security adhesive film containing a diffusive identification medium. If the film is adhered to a substrate, the identification medium results in a permanent marking of the substrate.

Sicherheitsfolien und Sicherheitsetiketten spielen eine große Rolle bei der Markierung diebstahlgefährdeter oder sicherheitsrelevanter Werkstücke und Schriftstücke. Sie werden auf das zu sichernde Objekt aufgeklebt und sind nur unter großem Aufwand zu kopieren und/oder von der Objektoberfläche, dem Substrat, zu entfernen. Von besonderem Vorteil sind Sicherheitsfolien und -etiketten, deren Beschriftung auch nach Entfemen der Folie bzw. des Etiketts auf dem darunterliegenden Substrat dauerhaft nachweisbar sind: Sie zwingen den Dieb bzw. Fälscher zu aufwendigen Nacharbeiten, um die Spuren der Beschriftung auf dem Substrat zu tilgen und/oder eine gefälschte Beschriftung des Substrats zu erzeugen. Somit verringern sie beträchtlich die Attraktivität des Diebstahls bzw. der Fälschung. Zur Erzielung einer permanenten Beschriftung des Substrats wird die Sicherheitsfolie mit einem diffusionsfähigen Identifikationsmedium versehen, das nach dem Aufkleben der Folie in das darunterliegende Substrat wandert und in diesem eine physikalische und/oder chemische Reaktion hervorruft.Security films and security labels play a major role in marking theft-sensitive or safety-relevant workpieces and documents. They are glued to the object to be secured and are only with great effort to copy and / or remove from the object surface, the substrate. Of particular advantage are security films and labels whose labels are permanently detectable even after removal of the film or the label on the underlying substrate: they force the thief or counterfeiter to elaborate rework to erase the traces of the label on the substrate and / or to produce a fake label of the substrate. Thus, they significantly reduce the attractiveness of theft or counterfeiting. To achieve a permanent inscription of the substrate, the security film is provided with a diffusive identification medium which, after the film has been glued, migrates into the underlying substrate, causing it to undergo a physical and / or chemical reaction.

Aus der US 5 346 738 ist ein Sicherheitsetikett bekannt, das als Identifikationsmedium eine Säure in mikro-verkapselter Form enthält. Wird auf das Etikett - insbesondere durch den Aufklebevorgang auf ein Objekt - ein Druck ausgeübt, so bricht die Verkapselung auf, das Identifikationsmedium wird freigesetzt und diffundiert zur Substratoberfläche, auf der es eine ätzende Reaktion hervorruft. Der Beschriftungsvorgang ist hierbei ein integraler Teil des chemisch/technischen Herstellungsprozesses des Etiketts und muß daher beim Etikettenhersteller erfolgen.US Pat. No. 5,346,738 discloses a security label which contains an acid in microencapsulated form as the identification medium. If a pressure is exerted on the label, in particular by the adhesion process to an object, the encapsulation breaks, the identification medium is released and diffuses to the substrate surface, where it causes a corrosive reaction. The labeling process is an integral part of the chemical / technical manufacturing process of the label and must therefore take place at the label manufacturer.

Somit kann durch diese Etiketten die für einen wirksamen Diebstahlschutz unumgängliche Anforderung des Anwenders nicht erfüllt werden, die Beschriftung der Etiketten im eigenen Hause und möglichst kurzfristig vornehmen zu können und das Beschriftungsmuster nach Bedarf umzugestalten, um eine möglichst hohe Fälschungssicherheit sicherstellen zu können.
Ein weiterer Nachteil dieser Etiketten besteht darin, daß die Beschriftung der Etikettoberseite in einem weiteren, getrennten Prozeßschritt erfolgt, was das Verfahren aufwendig und fehleranfällig macht.Thus, the user's requirement, which is indispensable for effective theft protection, can not be met by these labels, the labels can be inscribed in-house and as short as possible, and the inscription pattern can be redesigned as needed to ensure the highest possible counterfeit security.
Another disadvantage of these labels is that the labeling of the label top is done in a further, separate process step, which makes the process consuming and error prone.

Aus der WO 97/40484 ist ein Sicherheitsetikett bekannt, das eine Klebeschicht mit einem diffusionsfähigen Identifikationsmedium enthält. Die Beschriftung des Etiketts erfolgt durch ein Barrieremedium, das, der Beschriftung entsprechend, selektiv so auf die Klebeschicht aufgetragen wird, daß es die dem Substrat zugewandten Seite teilweise maskiert. Wird das Etikett auf das Substrat aufgeklebt, so soll das Barrieremedium lokal die Diffusion des Identifikationsmediums von der Klebeschicht zum Substrat verhindern bzw. vermindern, während in den vom Barrieremedium freien Bereichen eine ungehinderte Diffusion stattfinden soll. Die Beschriftung der Etiketten, d.h. der Auftrag des Barrieremediums, kann zwar vom Anwender im eigenen Hause durchgeführt werden; allerdings ist dies ein fehleranfälliger Prozeß, da sichergestellt werden muß, daß durch die Beschriftung die Haltbarkeit und die Klebeeigenschaften des Etiketts nicht beeinträchtigt werden. Deswegen sind diese Sicherheitsetiketten für den Einsatz im Fabrikumfeld nur beschränkt tauglich.From WO 97/40484 a security label is known, which contains an adhesive layer with a diffusive identification medium. Labeling of the label is effected by a barrier medium which, according to the inscription, is selectively applied to the adhesive layer so as to partially mask the side facing the substrate. If the label is adhered to the substrate, the barrier medium should locally prevent or reduce the diffusion of the identification medium from the adhesive layer to the substrate, while unimpeded diffusion should take place in the regions free of the barrier medium. The label of the labels, i. the order of the barrier medium can be carried out by the user in-house; however, this is an error-prone process because it must be ensured that the label does not compromise the durability and adhesive properties of the label. That is why these safety labels are only of limited use for use in the factory environment.

In der US 4 841 652 ist eine Sicherheitsfolie mit einer Trägerschicht gezeigt, auf die eine Klebeschicht mit einem diffusionsfähigen Identifikationsmedium aufgebracht ist. Um die Diffusion des Identifikationsmediums in die Trägerschicht und somit eine Schädigung der Trägerschicht bzw. ein Sichtbarwerden des Identifikationsmediums in der Trägerschicht zu vermeiden, wird zwischen Trägerschicht und Klebeschicht eine Barriereschicht angeordnet, die das Identifikationsmedium daran hindert, in die Trägerschicht einzudringen.US Pat. No. 4,841,652 shows a security film with a carrier layer to which an adhesive layer with a diffusible identification medium is applied. In order to avoid the diffusion of the identification medium into the carrier layer and thus damage to the carrier layer or a visibility of the identification medium in the carrier layer, a barrier layer is arranged between carrier layer and adhesive layer, which prevents the identification medium from penetrating into the carrier layer.

Die EP 845 767 A1 offenbart ein Sicherheitsetikett mit einer Klebeschicht, die ein darin dispergiertes Identifikationsmedium enthält. Das Etikett wird mittels der Klebeschicht auf eine Substratoberfläche aufgeklebt. Die Aktivierung des Identifikationsmediums erfolgt durch lokales Entfernen der Klebeschicht, z.B. durch selektives Ausschneiden oder Ausbrennen, durch selektive Verdrängung der Klebeschicht aufgrund Druckausübung oder Laserabtragung oder durch selektives Auftragen einer Polymerschicht auf die substratzugewandte Seite der Klebeschicht.EP 845 767 A1 discloses a security label having an adhesive layer containing an identification medium dispersed therein. The label is adhered to a substrate surface by means of the adhesive layer. The activation of the identification medium takes place by local removal of the adhesive layer, for example by selective cutting or burnout, by selective displacement of the adhesive layer due to pressure application or laser ablation or by selective application of a polymer layer to the substrate side of the adhesive layer.

Der Erfindung liegt die Aufgabe zugrunde, eine widerstandsfähige, einfach und schnell im Fabrikumfeld zu beschriftende Sicherheitsfolie zur Verfügung zu stellen, die gleichzeitig die Verfälschung der Identität der zu sichernden Produkte bei Diebstählen erschwert.The invention has for its object to provide a durable, easy and fast to be inscribed in the factory field security film that also makes it difficult to falsify the identity of the products to be secured in case of theft.

Die Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruchs 1 gelöst.The object is achieved by the features of claim 1.

Danach enthält die Sicherheitsfolie eine Trägerschicht, in der ein Identifikationsmedium enthalten ist. Mit Hilfe eines berührungslosen Beschriftungsprozesses können die Diffusionseigenschaften dieses Identifikationsmediums gezielt selektiv und lokal verändert werden. Wird die so beschriftete Sicherheitsfolie auf ein Werkstück aufgeklebt, so diffundiert das Identifikationsmedium zur Substratoberfläche hin und bewirkt dort eine nachweisbare Reaktion. Dabei erfolgt diese Diffusion bzw. Reaktion nur in solchen Bereichen der Substratoberfläche, in denen durch den Beschriftungsvorgang die Diffusionsfähigkeit ausgelöst bzw. nicht behindert wurde. Somit ermöglicht die Sicherheitsfolie eine eindeutige Beschriftung und Identifikation des Werkstücks.Thereafter, the security film contains a carrier layer in which an identification medium is contained. With the help of a non-contact labeling process, the diffusion properties of this identification medium can be specifically selectively and locally changed. If the security film labeled in this way is adhered to a workpiece, the identification medium diffuses toward the substrate surface, where it causes a detectable reaction. In this case, this diffusion or reaction takes place only in those areas of the substrate surface in which the diffusion capability was triggered or not obstructed by the inscription process. Thus, the security film allows a clear labeling and identification of the workpiece.

Die Sicherheitsfolie wird erfindungsgemäß mittels eines berührungslosen Verfahrens beschriftet. So kann auch im Fabrikumfeld eine schmutzunempfindliche, schnelle, flexibel variierbare Beschriftung erreicht werden. Die Beschriftung der Sicherheitsfolie - und somit die Änderung der Diffusionseigenschaften des Identifikationsmediums - kann insbesondere mit Hilfe elektromagnetischer Strahlung erfolgen. Besonders vorteilhaft zur Beschriftung der Sicherheitsfolie ist der Einsatz eines Lasers, mit Hilfe dessen sowohl eine temperatur- als auch eine lichtsensitive Beschriftung erfolgen kann (wobei der Begriff "Licht" in diesem Fall den gesamten dem Laser zugänglichen Bereich des elektromagnetischen Spektrums umfaßt). Laser haben den zusätzlichen Vorteil, kontrastreiche Beschriftungen mit einer beliebigen Wahl des Musters zu ermöglichen, schnelle Änderungen des Beschriftungsmusters zu gestatten und prozeßsicher im Fabrikumfeld einsetzbar zu sein.The security film is labeled according to the invention by means of a non-contact method. Thus, even in the factory environment a dirt-resistant, fast, flexible variable labeling can be achieved. The labeling of the security film - and thus the change of the diffusion properties of the identification medium - can be done in particular by means of electromagnetic radiation. Particularly advantageous for labeling the security film is the use of a laser, by means of which both a temperature-sensitive and a light-sensitive labeling can take place (the term "light" in this case, the entire laser-accessible range of the electromagnetic spectrum comprises). Lasers have the additional advantage of allowing high-contrast labels with any choice of pattern, allowing rapid changes in the pattern of the label, and being process reliable in the factory environment.

Als Identifikationsmedium wird ein Stoff gewählt, der auf dem Substrat eine nachweisbare Reaktion auslöst. Hierzu muß das Identifikationsmedium den Werkstoffeigenschaften des Substrats angepaßt werden. So kann das Identifikationsmedium einen - auf das Substrat abgestimmten - Farbstoff enthalten, der lokal in die Substratoberfläche eindiffundiert und diese einfärbt. Alternativ kann das Identifikationsmedium einen Stoff enthalten, der mit der Substratoberfläche eine chemische Reaktion eingeht. Von besonderem Interesse sind hierbei Reaktionen, bei denen die Substratoberfläche lokal abgetragen oder lokal aufgebläht wird, so daß die Beschriftung des Substrats nach Entfernen der Folie optisch oder auch taktil nachgewiesen werden kann. Für die Markierung metallischer Substrate empfiehlt sich insbesondere ein Identifikationsmedium, das eine ätzende Substanz enthält.As identification medium, a substance is selected which triggers a detectable reaction on the substrate. For this purpose, the identification medium must be adapted to the material properties of the substrate. Thus, the identification medium may contain a dye, which is adapted to the substrate and which locally diffuses into the substrate surface and dyes it. Alternatively, the identification medium may include a substance that undergoes a chemical reaction with the substrate surface. Of particular interest here are reactions in which the substrate surface is removed locally or locally inflated, so that the labeling of the substrate after removal of the film can be detected optically or tactilely. In particular, an identification medium containing a corrosive substance is recommended for the marking of metallic substrates.

Zur Erhöhung des Diebstahlschutzes kann es ratsam sein, ein Identifikationsmedium zu wählen, dessen Einfluß auf das darunterliegende Substrat nicht mit dem bloßen Auge erkennbar ist. Dies kann mit einem Identifikationsmedium erreicht werden, das die Absorptions- und Reflexionseigenschaften des Substrats z.B. nur im UV- oder IR-Bereich, nicht aber im sichtbaren Bereich beeinflußt. Entfernt ein Dieb bzw. Fälscher die Folie, so enthält das Substrat keine sichtbaren Spuren der Markierung, und der Dieb bzw. Fälscher wird keine Notwendigkeit sehen, die Substratoberfläche in den betroffenen Bereichen abzutragen bzw. zu übertünchen. Die betroffenen Bereiche enthalten dabei nach wie vor die Markierung, die von informierten Sicherheitskräften einfach mit Hilfe z.B. eines UV- oder IR-Sichtgerätes nachgewiesen werden kann. Insbesondere kann das Identifikationsmedium so gewählt werden, daß die Nachweisbarkeit, z. B. die UV-Fluoreszenz, nur bei bestimmten Wellenlängen des prüfenden Lichtes erfolgt.To increase theft protection, it may be advisable to choose an identification medium whose influence on the underlying substrate is not visible to the naked eye. This can be accomplished with an identification medium that exhibits the absorption and reflection properties of the substrate, e.g. only in the UV or IR range, but not affected in the visible range. If a thief or counterfeiter removes the film, the substrate will not contain any visible traces of the marking, and the thief or counterfeiter will not see any need to scrape or paint over the substrate surface in the affected areas. The affected areas still contain the markers which are simply displayed by informed security forces using e.g. a UV or IR viewing device can be detected. In particular, the identification medium can be chosen so that the detectability, for. As the UV fluorescence, takes place only at certain wavelengths of the test light.

Für einen industriellen Einsatz der Sicherheitsfolie, insbesondere in der Automobilindustrie, muß die Folie eine hohe Robustheit gegenüber Temperatur- und Lichteinflüssen aufweisen. Diese Anforderungen können am besten erfüllt werden, wenn die Sicherheitsfolie physikalische Barrieren aufweist, die im unbeschriebenen Zustand der Folie die Diffusion des Identifikationsmedium hemmen. Während des Beschriftungsvorgangs werden diese Barrieren lokal zerstört bzw. geschwächt, so daß in den so geschwächten Bereichen eine selektive Diffusion des Identifikationsmediums stattfinden kann. Um eine hohe Temperatur- bzw. Lichtbeständigkeit der Beschriftung zu erreichen, müssen die zur Zerstörung der Barrieren erforderlichen Temperaturen bzw. Lichtintensitäten wesentlich höher liegen als diejenigen, denen das zu markierende Objekt im Gebrauchszustand - auch unter extremen Umgebungsbedingungen - unterliegt.For industrial use of the security film, especially in the automotive industry, the film must have a high resistance to temperature and light. These requirements can best be met if the security film has physical barriers which inhibit the diffusion of the identification medium in the unrecorded state of the film. During the labeling process, these barriers are locally destroyed or weakened, so that selective diffusion of the identification medium can take place in the regions thus weakened. In order to achieve a high temperature or light resistance of the lettering, the temperatures or light intensities required for the destruction of the barriers must be substantially higher than those to which the object to be marked in use - even under extreme environmental conditions - subject.

Eine solche Diffusionshemmung des Identifikationsmediums, die durch eine berührungslose Beschriftung aufhebbar ist, kann durch eine Mikro-Verkapselung des Identifikationsmediums in der Trägerschicht realisiert werden. Das Identifikationsmedium ist in Kapseln eingeschlossen, deren Wandungen z.B. aus Wachs und/oder Fett bestehen und z.B. durch den lokalen Einfluß von Wärme in den betroffenen Bereichen der Folie aufgebrochen werden können, so daß das darin enthaltene Identifikationsmedium entweichen und - beim Kontakt mit dem Substrat - in dieses hineindiffundieren bzw. mit ihm reagieren kann.Such a diffusion inhibition of the identification medium, which can be canceled by a non-contact labeling can be realized by a micro-encapsulation of the identification medium in the carrier layer. The identification medium is enclosed in capsules whose walls are e.g. made of wax and / or fat and e.g. can be broken by the local influence of heat in the affected areas of the film, so that the identification medium contained therein escape and - in contact with the substrate - diffuse into this or can react with it.

Eine besonders hohe Temperaturbeständigkeit der Beschriftung läßt sich erreichen, wenn die Barriere durch eine Barriereschicht gebildet wird, die flächig zwischen Trägerschicht und einer Klebeschicht angeordnet ist und die im unbeschrifteten Zustand der Folie die Diffusion des Identifikationsmediums aus der Trägerschicht heraus verhindert. Durch eine Beschriftung der Folie wird die Barriereschicht lokal durchbrochen, so daß das Identifikationsmedium an diesen Durchbruchsstellen lokal aus der Trägerschicht heraus entweichen und in die Klebeschicht hineindiffundieren kann. Wird die Folie mit der Klebeschicht auf ein Substrat aufgeklebt, so kommen ausgewählte Bereiche des Substratoberfläche mit dem diffundierten Identifikationsmedium in Berührung und erfahren eine chemische bzw. physikalische Reaktion. Die bei der Beschriftung unversehrt gebliebenen Bereiche der Barriereschicht verhindern wirksam die Diffusion des Identifikationsmediums und somit eine Reaktion in diesen nichtbeschrifteten Bereichen. Sowohl das Beschriftungsverfahren als auch die Lage der Barriereschicht im Inneren der Sicherheitsfolie stellen einen wirksamen Schutz der Folie gegenüber Nachahmung und Fälschung dar. Weiterhin kann ein Identifikationsmedium gewählt werden, das in der unbeschrifteten Sicherheitsfolie in diffusionsfähiger Form vorliegt, im Zuge der Beschriftung aber lokal fixiert wird.A particularly high temperature resistance of the label can be achieved if the barrier is formed by a barrier layer which is arranged flat between the carrier layer and an adhesive layer and which prevents the diffusion of the identification medium from the carrier layer in the unlabeled state of the film. By inscribing the film, the barrier layer is locally broken, so that the identification medium at these breakthrough sites escape locally from the carrier layer and diffuse into the adhesive layer. When the film with the adhesive layer is adhered to a substrate, selected regions of the substrate surface come into contact with the diffused identification medium and undergo a chemical or physical reaction. The areas of the barrier layer which remained intact in the inscription effectively prevent the diffusion of the identification medium and thus a reaction in these non-inscribed areas. Both the labeling process and the position of the barrier layer inside the security film provide effective protection of the film against counterfeiting and counterfeiting. Furthermore, an identification medium can be selected which is present in diffusible form in the unlabeled security film but is locally fixed in the course of the inscription ,

Es ist einerseits möglich, daß die Trägerschicht eine Art Matrix darstellt, in die das Identifikationsmedium eingebettet ist. Alternativ kann der Stoff der Trägerschicht selbst das Identifikationsmedium darstellen, so daß die Trägerschicht aus Identifikationsmedium besteht.It is possible, on the one hand, for the carrier layer to represent a type of matrix in which the identification medium is embedded. Alternatively, the substance of the carrier layer itself may be the identification medium, so that the carrier layer consists of identification medium.

Zur schnellen Identifikation der Sicherheitsfolie kann es zweckmäßig sein, wenn die der Träger- bzw. der Barriereschicht eingeprägte Beschriftung der Sicherheitsfolie nicht nur auf dem Substrat, sondern auf der Folie selbst sichtbar dargestellt ist. Hierzu ist es besonders vorteilhaft, die Folie mit einer Deckschicht zu versehen, deren Beschriftung zusammen mit der Beschriftung des Identifikationsmediums im gleichen Prozeßschritt erfolgt. Als besonders günstig erweist sich hierfür die Verwendung einer mehrschichtigen laserbeschriftbaren Deckschicht.For rapid identification of the security film, it may be expedient if the inscription of the security film embossed on the carrier or barrier layer is not only visible on the substrate but also on the film itself. For this purpose, it is particularly advantageous to provide the film with a cover layer, the labeling is carried out together with the labeling of the identification medium in the same process step. For this purpose, the use of a multilayer laser-inscribable cover layer proves to be particularly favorable.

Zum Schutz der Sicherheitsfolie bzw. der daraus hergestellten Sicherheitsetiketten sowie im Interesse einer bequemen Handhabung werden diese zweckmäßigerweise auf einem Trennpapier angeordnet. Dadurch können Transport, Vereinzelung und Beschriftung der Folie bzw. der Etiketten wesentlich vereinfacht werden.To protect the security film or the security labels produced therefrom and in the interests of convenient handling, these are expediently arranged on a release paper. As a result, transport, separation and labeling of the film or the labels can be significantly simplified.

Zur Kennzeichnung eines Objekts mit einem aus der Sicherheitsfolie gefertigten Sicherheitsetikett wird das unbeschriftete Etikett zunächst auf die Objektoberfläche aufgeklebt; dann erfolgt die berührungslose Beschriftung, durch die das Identifikationsmedium freigesetzt und die dauerhafte Markierung der Objektoberfläche ausgelöst wird. Dieser Beschriftungsabtauf hat den Vorteil, daß die Beschriftung direkt am zu schützenden Objekt stattfindet, eine Fehlmarkierung des Objekts durch Vertauschung von Etiketten also ausgeschlossen werden kann. Andererseits können, insbesondere auf empfindlichen Objektoberflächen, durch den gewählten Beschriftungsprozeß - z.B. durch die Wärmeentwicklung des Beschriftungslasers - unerwünschte Schäden entstehen. In diesem Falle wird das Sicherheitsetikett zweckmäßigerweise zunächst separat beschriftet, wodurch das Identifikationsmedium lokal freigesetzt wird; dann wird das so beschriftete Etikett auf das Objekt aufgeklebt.To mark an object with a security label made from the security film, the unlabeled label is first glued to the object surface; then the non-contact label, through which the identification medium is released and the permanent marking of the object surface is triggered. This Beschriftungsabtauf has the advantage that the label takes place directly on the object to be protected, so a mis-marking of the object can be excluded by permutation of labels. On the other hand, undesired damage can occur, in particular on sensitive object surfaces, as a result of the selected labeling process-for example due to the heat development of the marking laser. In this case, the security label is expediently initially separate labeling, whereby the identification medium is released locally; then the so-labeled label is glued to the object.

Die erfindungsgemäße Sicherheitsfolie eignet sich insbesondere zur Markierung von Kraftfahrzeugen, die stark diebstahlgefährdet sind. Die Markierung gestattet jederzeit eine eindeutige Identifizierung des Fahrzeugs. Es ist weiterhin empfehlenswert, teure und besonders diebstahlgefährdete Bestandteile und Einrichtungen des Fahrzeugs separat zu markieren, um ihre Identität unabhängig vom Fahrzeug selbst nachweisen zu können. Zur Markierung der Fahrzeugkarosse wird zweckmäßigerweise ein Identifikationsmedium verwendet, das mit dem Fahrzeuglack eine nachweisbare - wenn auch u.U. nicht mit dem bloßen Auge sichtbare - Reaktion eingeht.The security film according to the invention is particularly suitable for marking motor vehicles that are highly vulnerable to theft. The marking allows at any time a clear identification of the vehicle. It is also advisable to mark expensive and particularly theft-endangered components and equipment of the vehicle separately in order to be able to prove their identity independently of the vehicle itself. To mark the vehicle body, an identification medium is expediently used, which is detectable with the vehicle paint - albeit u.U. reaction that is not visible to the naked eye.

Im folgenden ist die Erfindung anhand einiger in den Zeichnungen dargestellten Ausführungsbeispiele noch näher erläutert; dabei zeigen:

  • Fig. 1 Eine Schnittansicht eines aus Sicherheitsfolie hergestellten Sicherheitsetiketts mit Barriereschicht ...
    • Fig. 1a ... vor der Beschriftung,
    • Fig. 1b ... während der Beschriftung,
    • Fig. 1c ... nach Aufkleben auf ein Substrat,
  • Figuren 1a bis 1c zeigen ein aus der erfindungsgemäßen Sicherheitsfolie 1 hergestelltes Sicher heitsetikett 2, das eine Trägerschicht 4 enthält, in der ein Identifikationsmedium 3 enthalten ist, das in der Trägerschicht 4 diffundieren kann. Die Trägerschicht 4 ist auf eine Deckschicht 5 aufgetragen, die die mechanische Stabilität des Etiketts 2 gewährleistet. Auf der Deckschicht 5 gegenüberliegende Oberfläche der Trägerschicht 4 befindet sich eine Barriereschicht 6, die ihrerseits an eine Klebeschicht 7 grenzt. Die Klebeschicht 7 des Etiketts 2 ist mit einem Trennpapier 8 versehen, das die Handhabung der Etiketten während des Transports, der Vereinzelung und der Beschriftung erleichtert und ein unerwünschtes Haften der Klebeschicht 7 während der Bearbeitungsschritte verhindert.
In the following the invention with reference to some embodiments illustrated in the drawings is explained in more detail; show:
  • 1 is a sectional view of a safety label made of security film with barrier layer ...
    • Fig. 1a ... before the lettering,
    • Fig. 1b ... during the labeling,
    • Fig. 1c ... after sticking to a substrate,
  • FIGS. 1 a to 1 c show a security label 2 produced from the security film 1 according to the invention, which contains a carrier layer 4 in which an identification medium 3 is contained, which can diffuse in the carrier layer 4. The carrier layer 4 is applied to a cover layer 5, which ensures the mechanical stability of the label 2. On the cover layer 5 opposite surface of the carrier layer 4 is a barrier layer 6, which in turn adjoins an adhesive layer 7. The adhesive layer 7 of the label 2 is provided with a release paper 8, which facilitates the handling of the labels during transport, singulation and labeling and prevents unwanted adhesion of the adhesive layer 7 during the processing steps.

In Figur 1a ist ein unbeschriftetes Etikett 2 dargestellt. In diesem Zustand ist die Barriereschicht 6 eine durchgängige, für das Identifiktionsmedium 3 undurchlässige Schicht. Sie überspannt einen Barrierebereich 9, der mindestens so groß ist wie der Beschriftungsbereich 9', der für die Beschriftung des Etiketts 2 vorgesehen ist. Zweckmäßigerweise erstreckt sich die Barriereschicht 6 über die Gesamtfläche des Etiketts 2 und stellt somit sicher, daß vor der Beschriftung nirgendwo auf dem Etikett 2 eine Diffusion des Identifikationsmediums 3 aus der Trägerschicht 4 in die Klebeschicht 7 erfolgt.In Figure 1a, an unlabeled label 2 is shown. In this state, the barrier layer 6 is a continuous, for the Identifiktionsmedium 3 impermeable layer. It spans a barrier area 9, which is at least as large as the labeling area 9 ', which is provided for the labeling of the label 2. Conveniently, the barrier layer 6 extends over the entire surface of the label 2 and thus ensures that before the lettering Nowhere on the label 2, a diffusion of the identification medium 3 from the carrier layer 4 in the adhesive layer 7 takes place.

Im vorliegenden Ausführungsbeispiel besteht die Trägerschicht 4 aus einer harzmodifizierten Acrylatklebmasse. Sie enthält als Identifikationsmedium 3 eine wanderungsfähige Substanz, die als Trägerstoff für einen UV-Fluoreszenzfarbstoff dient. Im vorliegenden Ausführungsbeispiel ist die Trägerfolie mit einem UV-Pigment von 1 - 3% versetzt (z.B. C-Leuchtpigment zur Fälschungssicherung von Wertpapieren, Dokumenten oder Produkten, wie z.B. Y2O2S:Eu) und enthält zusätzlich 3 - 6% Dibutylphthalat als Trägerstoff. Die Barriereschicht 6, die die Wanderung der Trägermoleküle und Leuchtpigmente behindert, wird durch eine dünne, transparente Kunststoffolie gebildet, z.B. eine 12 - 25 µm dicke Polyacetatfolie. Die Klebeschicht 7 besteht - ebenso wie die Trägerschicht 4 - aus einer Klebmasse auf Basis eines harzmodifizierten Acrylatpolymers. Die Deckschicht 5 besteht aus einer mehrschichtigen Folie, wie sie z.B. im Gebrauchsmuster DE 81 30 861 beschrieben ist. Diese Deckschicht 5 ist mit Hilfe eines Lasers 10 beschriftbar, wobei die obere Lackschicht 11 abgetragen wird, so daß lokal die darunterliegende Lackschicht 12 zum Vorschein kommt.In the present embodiment, the carrier layer 4 consists of a resin-modified acrylate adhesive. It contains as the identification medium 3 a migratory substance which serves as a carrier for a UV fluorescent dye. In the present exemplary embodiment, the carrier film is admixed with a UV pigment of 1 to 3% (for example C luminescent pigment for securing against forgery of documents or products such as Y 2 O 2 S: Eu) and additionally contains 3 to 6% dibutyl phthalate carrier. The barrier layer 6, which impedes the migration of the carrier molecules and luminescent pigments, is formed by a thin, transparent plastic film, for example a 12 to 25 μm thick polyacetate film. The adhesive layer 7 consists - as well as the carrier layer 4 - of an adhesive based on a resin-modified acrylate polymer. The cover layer 5 consists of a multilayer film, as described for example in the utility model DE 81 30 861. This cover layer 5 can be labeled with the aid of a laser 10, the upper lacquer layer 11 being removed, so that locally the underlying lacquer layer 12 comes to light.

Die Beschriftung des Etiketts 2 (siehe Figur 1b) ist der Prozeß, bei dem gezielt lokal eine Diffusion des Identifikationsmediums 3 aus der Trägerschicht 4 in die Klebeschicht 7 ermöglicht wird. Dies geschieht durch eine gezielte lokale Schwächung der Barriereschicht 6. Im vorliegenden Ausführungsbeispiel durchdringt die Laserstrahlung hierfür sowohl die Deckschicht 5 als auch die Trägerschicht 4 und muß somit nach Durchdringung dieser beiden Schichten eine ausreichende Leistung haben, um die Barriereschicht 6 lokal zu durchbrechen bzw. zu schwächen. Wird eine Barriereschicht 6 aus Polyacetatfolie verwendet, so wird diese Folie durch den üblichen, zur Beschriftung der Deckfolie verwendeten, Schneidprozeß mit Hilfe eines Lasers 10 lokal zerstört und ermöglicht an diesen Löchern 13 eine Wanderung des Identifikationsmediums 3 in die Klebeschicht 7 hinein. Damit während der Beschriftung die lokale Zerstörung der Barriereschicht 6 prozeßsicher gewährleistet ist, muß die zur Beschriftung verwendete Laserleistung entsprechend hoch gewählt werden. Weiterhin muß die Barriereschicht 6 eine ausreichend hohe Absorptionsfähigkeit für die Strahlung haben.The inscription of the label 2 (see FIG. 1b) is the process in which locally a diffusion of the identification medium 3 from the carrier layer 4 into the adhesive layer 7 is made possible. This is done by a targeted local weakening of the barrier layer 6. In the present embodiment, the laser radiation for this penetrates both the cover layer 5 and the support layer 4 and thus must have sufficient power after penetration of these two layers to break the barrier layer 6 locally or to weaknesses. If a barrier layer 6 made of polyacetate film is used, then this film is locally destroyed by the usual cutting process used to inscribe the cover film with the aid of a laser 10 and allows a migration of the identification medium 3 into the adhesive layer 7 at these holes 13. In order to ensure the local destruction of the barrier layer 6 during the labeling process reliably, the laser power used for labeling must be selected to be correspondingly high. Furthermore, the barrier layer 6 must have a sufficiently high absorption capacity for the radiation.

Alternativ bzw. zusätzlich zu der oben beschriebenen Beschriftung der Barriereschicht 6, die durch Deckschicht 5 und Trägerschicht 4 hindurch erfolgt, kann die Barriereschrift 6 auch aus Richtung der Klebeschicht 7 erfolgen. In diesem Fall müssen Trennpapier 8 und Klebeschicht 7 ausreichend transparent gegenüber der Laserstrahlung sein.Alternatively, or in addition to the above-described inscription of the barrier layer 6, which takes place through cover layer 5 and support layer 4, the barrier text 6 can also take place from the direction of the adhesive layer 7. In this case, release paper 8 and adhesive layer 7 must be sufficiently transparent to the laser radiation.

Der Beschriftungszug kann z.B. aus Buchstaben, Zahlen oder einer alphanumerischen Zeichenfolge bestehen. Desweiteren kann der Beschriftungszug auch einen Streifencode, ein graphisches Symbol, ein Firmenlogo und/oder eine Mischung mehrerer dieser Zeichenklassen aufweisen.The lettering train may e.g. consist of letters, numbers or an alphanumeric string. Furthermore, the inscription strip can also have a bar code, a graphic symbol, a company logo and / or a mixture of several of these character classes.

Nach erfolgter Laserbeschriftung kann das Sicherheitsetikett 2 nun auf ein Substrat 14 aufgeklebt werden (siehe Figur 1c). Hierzu wird es vom Trennpapier 8 abgenommen und mit der nun freiwerdenden Unterseite 15 der Klebeschicht 7 auf das Substrat 14 gedrückt. Das durch die Löcher 13 der Barriereschicht 6 und durch die Klebeschicht 7 diffundierte Identifikationsmedium 3 kommt nun in Kontakt mit der Substratoberfläche 16. Das im Identifikationsmedium 3 enthaltene (UV-)Leuchtpigment bewirkt eine lokale (UV-)Einfärbung der Substratoberfläche 16 und somit ein Abbild 17 des Beschriftungsmusters, das z.B. mit Hilfe einer UV-Lampe nachgewiesen werden kann.After the laser has been inscribed, the security label 2 can now be glued onto a substrate 14 (see FIG. 1c). For this purpose, it is removed from the release paper 8 and pressed with the now released bottom 15 of the adhesive layer 7 on the substrate 14. The identification medium 3 diffused through the holes 13 of the barrier layer 6 and through the adhesive layer 7 now comes into contact with the substrate surface 16. The (UV) luminescent pigment contained in the identification medium 3 causes a local (UV) coloring of the substrate surface 16 and thus an image 17 of the labeling pattern, the example can be detected by means of a UV lamp.

Damit das Identifikationsmedium auf der Substratoberfläche 16 nachweisbare Spuren hinterläßt, müssen die Stoffeigenschaften des Identifikationsmediums 3 auf diejenigen des Substrats 14 abgestimmt werden. Wird als Identifikationsmedium 3 ein sichtbarer Farbstoff gewählt, dessen Farbe mit der Farbe der Substratoberfläche 16 kontrastiert, so kann die Entzifferung der Beschriftung mit dem bloßen Auge erfolgen. Hat das Identifikationsmedium 3 z. B. eine ätzende Wirkung auf das Substrat, so hat die Beschriftung eine lokale Änderung der Reflexionseigenschaften der Substratoberfläche 16 zur Folge, welche z.B. mit optischen Methoden (insbesondere mit streifendem Lichteinfall) nachgewiesen werden kann. Weiterhin kann ein Identifikationsmedium 3 gewählt werden, das auf dem Substrat 14 keine sichtbaren Spuren hinterläßt, dessen Präsenz auf der Substratoberfläche 16 aber chemisch nachgewiesen werden kann, indem die Substratoberfläche 16 mit einer geeignet gewählten Substanz benetzt wird, die eine mit physikalischen Mitteln nachweisbare chemische Reaktion mit dem Identifikationsmedium eingeht (z.B. einen Umschlag des pH-Wertes, der sich in einem Farbumschlag der benetzenden Substanz äußert). Weiterhin kann das Identifikationsmedium 3 einen magnetischen Markierungsstoff enthalten; die durch die Beschriftung erzeugte lokale Magnetisierung des Substrats 14 kann dann durch Aufbringen einer magnetisch aktiven Nachweissubstanz entziffert werden.In order for the identification medium on the substrate surface 16 to leave detectable traces, the material properties of the identification medium 3 must be matched to those of the substrate 14. If a visible dye whose color matches the color of the substrate surface 16 is selected as the identification medium 3, the deciphering of the label can be carried out with the naked eye. Has the identification medium 3 z. For example, as a corrosive effect on the substrate, the inscription results in a local change in the reflective properties of the substrate surface 16, which may be e.g. can be detected with optical methods (in particular with grazing incidence of light). Furthermore, an identification medium 3 may be selected which leaves no visible traces on the substrate 14, but whose presence on the substrate surface 16 can be detected chemically by wetting the substrate surface 16 with a suitably chosen substance which exhibits a detectable by physical means chemical reaction with the identification medium is received (eg an envelope of the pH, which manifests itself in a color change of the wetting substance). Furthermore, the identification medium 3 may contain a magnetic marker; the local magnetization of the substrate 14 produced by the label can then be deciphered by applying a magnetically active analyte.

Das aus der erfindungsgemäßen Sicherheitsfolie 1 hergestellte Sicherheitsetikett 2 eignet sich in der Automobilindustrie insbesondere zur Markierung von Karosserien. Durch die Verwendung des Sicherheitsetikett 2 z.B. auf Außenhaut, Rahmen und/oder Fahrgestell wird eine eindeutige Fahrzeugidentifizierung möglich. Hierfür wird das Identifikationsmedium 3 zweckmäßigerweise so gewählt, daß es auf dem Fahrzeuglack nachweisbare Spuren hinterläßt. Weiterhin können auch Fahrzeugbestandteile und Einrichtungen markiert werden. Dies empfiehlt sich insbesonde-re für Komponenten, die besonders diebstahlgefährdet (Autoradio, Autotelefon) oder besonders fälschungsanfällig (teure Ausstattungsteile, teure sicherheitsrelevante Teile) sind.The security label 2 produced from the security film 1 according to the invention is suitable in the automotive industry, in particular for marking bodies. By using the security label 2, for example, on the outer skin, frame and / or chassis a clear vehicle identification is possible. For this purpose, the identification medium 3 is suitably chosen so that it leaves detectable traces on the vehicle paint. Furthermore, vehicle components and facilities can also be marked. This is recommended in particular for components that are particularly vulnerable to theft (car radio, car phone) or particularly susceptible to forgery (expensive equipment, expensive safety-relevant parts).

Die Eigenschaften des Identifikationsmediums 3 und der Klebeschicht 7 legen fest, wie schnell die Diffusion des Identifikationsmediums 3 durch die Klebeschicht 7 hindurch auf das Substrat 14 erfolgt und bestimmen somit eine Relaxationszeit, nach deren Ablauf eine nachweisbare Markierung des Substrats 14 erfolgt ist. Diese Relaxationszeit ist stark temperaturabhängig. Für die Reaktion der oben beschriebenen Folie auf einer Automobillackierung beträgt diese Relaxationszeit bei Raumtemperatur etwa 2 Stunden. Verbleibt das Etikett 2 wesentlich kürzer als die Relaxationszeit auf dem Substrat 14, so kann es entfernt werden, ohne daß eine nachweisbare Markierung der Substratoberfläche 16 eingetreten ist. Somit besteht innerhalb der Relaxationszeit die Möglichkeit, ein fälschlich aufgeklebtes Etikett durch ein richtiges Etikett zu ersetzen.The properties of the identification medium 3 and the adhesive layer 7 determine how fast the diffusion of the identification medium 3 through the adhesive layer 7 on the substrate 14 takes place and thus determine a relaxation time, after the expiration of a detectable marking of the substrate 14 has taken place. This relaxation time is strongly temperature-dependent. For the reaction of the above-described film on an automotive finish, this relaxation time at room temperature is about 2 hours. If the label 2 remains substantially shorter than the relaxation time on the substrate 14, it can be removed without a detectable marking of the substrate surface 16 having occurred. Thus, within the relaxation time, it is possible to replace a wrongly affixed label with a proper label.

Je durchlässiger die Klebeschicht 7 für das diffundierende Identifikationsmedium 3 ist, desto stärker ist die seitliche Diffusion des Identifikationsmediums 3 in der Klebeschicht 7 selbst. Dies hat zur Folge, daß das Identifikationsmedium 3 die Substratoberfläche 16 auch - wenn auch in geringerem Maße - in Bereichen erreicht, die den unaufgebrochenen Bereichen 18 der Barriereschicht 6 gegenüberliegen und somit vom Identifikationsmedium 3 unberührt bleiben sollten. Dieser Effekt führt zu einer gewissen Ausfransung der Kontur des Beschriftungsmusters 17 auf dem Substrat 14. Um eine kontrastreiche Beschriftung des Substrats 14 zu erreichen, empfiehlt es sich, die Klebeschicht 7 möglichst dünn zu wählen, um diese Seitwärtsdiffusion des Identifikationsmediums 3 möglichst gering zu halten. Je dünner die Klebeschicht 7 ist, desto kürzer ist auch die Diffusionszeit des Identifikationsmediums 3 durch die Klebeschicht 7.The more permeable the adhesive layer 7 for the diffusing identification medium 3, the stronger the lateral diffusion of the identification medium 3 in the adhesive layer 7 itself. This has the consequence that the identification medium 3 also reaches the substrate surface 16 in areas, albeit to a lesser extent which are opposite to the unruptured regions 18 of the barrier layer 6 and thus should remain unaffected by the identification medium 3. This effect leads to a certain fraying of the contour of the inscription pattern 17 on the substrate 14. In order to achieve a high-contrast inscription of the substrate 14, it is advisable to choose the adhesive layer 7 as thin as possible in order to minimize this sideward diffusion of the identification medium 3. The thinner the adhesive layer 7, the shorter the diffusion time of the identification medium 3 through the adhesive layer 7.

Alternativ kann die Laserbeschriftung des Sicherheitsetiketts 2 auch erst nach Aufkleben des (unbeschrifteten) Etiketts 2 auf das Substrat 14 erfolgen. In diesem Fall muß die zur Beschriftung eingestellte Laserleistung einerseits so hoch gewählt werden, daß die lokale Zerstörung der Barriereschicht 6 prozeßsicher gewährleistet ist; andererseits darf durch die Laserbeschriftung keine Schädigung des Substrats erfolgen. Eine Beschriftung des bereits verklebten Etiketts 2 erfordert also eine gute Kontrolle der Laserleistung und ist nur für ausgewählte Substrate 14 anwendbar.Alternatively, the laser inscription of the security label 2 can also be effected only after the label 2 has been glued to the substrate 14. In this case, the laser power set for labeling must on the one hand be selected to be so high that the local destruction of the barrier layer 6 is assured in a process-reliable manner; On the other hand, laser marking must not damage the substrate. A label of the already glued label 2 thus requires a good control of the laser power and is only applicable to selected substrates 14.

Selbstverständlich kann die oben beschriebenen Beschriftung der Deckschicht 5 auch in einem getrennten Prozeßschritt, unabhängig von der lokalen Zerstörung der Barriereschicht 6 stattfinden, wenn die beiden Beschriftungsprozesse durch Strahlung in unterschiedlichen elektromagnetischen Spektralbereichen ausgelöst werden. Insbesondere kann auch vollständig auf eine Beschriftung der Deckschicht 5 verzichtet werden.Of course, the above-described inscription of the cover layer 5 can also take place in a separate process step, independently of the local destruction of the barrier layer 6, when the two inscription processes are triggered by radiation in different electromagnetic spectral ranges. In particular, it is also possible to completely dispense with a labeling of the cover layer 5.

Neben den bisher beschriebenen Sicherheitsetiketten 2, die aus der erfindungsgemäßen Sicherheitsfolie 1 hergestellt werden, kann die Sicherheitsfolie 1 weiterhin z.B. in Form von Klebeband, Deck-, Dekorations- und Schutzfolie etc. verwendet werden.In addition to the previously described security labels 2, which are produced from the security film 1 according to the invention, the security film 1 can continue to be e.g. in the form of adhesive tape, cover, decorative and protective film, etc. are used.

Claims (13)

  1. Security film (1),
    - which can be adhered to a substrate (14),
    - and comprises a base layer (4) containing the identification medium (3), which is specifically adapted to the material properties of the substrate (14) and generates a perceptible reaction in the substrate (14),
    - in which migration of the identification medium (3) from the security film (1) to the substrate (14) can be selectively and locally altered by a contactless printing process,
    characterised in that
    - the security film (1) has a barrier layer (6), which is disposed between the base layer (4) and the substrate (14) and prevents the identification medium (3) from migrating from the security film (1) to the substrate (14) in the non-printed state,
    - and the local variation in migration occurs due to a local weakening of the barrier layer (6).
  2. Security film as claimed in claim 1,
    characterised in that
    the barrier layer (6) is locally weakened by the local action of electromagnetic radiation.
  3. Security film as claimed in claim 2,
    characterised in that
    the barrier layer (6) is locally weakened by the local action of heat.
  4. Security film as claimed in claim 2 or 3,
    characterised in that
    the barrier layer (6) is locally weakened by a local effect of a laser beam (10).
  5. Security film as claimed in claim 1,
    characterised in that
    the identification medium (3) is a UV fluorescent marker substance and/or an infrared marker substance and/or a magnetic marker substance and/or a dye and/or contains a substance which causes a chemical reaction in the substrate (14).
  6. Security film as claimed in claim 5,
    characterised in that
    the identification medium (3) contains a substance which etches the surface of the substrate (14).
  7. Security film as claimed in claim 1,
    characterised in that
    the base layer (4) consists of the identification medium (3).
  8. Security film as claimed in claim 1,
    characterised in that
    the security film (1) is provided with a laser-printable top layer (5).
  9. Security film as claimed in claim 1,
    characterised in that
    the security film (1) is disposed on a peel-off paper (8).
  10. Method of printing a security film which can be adhered to a substrate, as claimed in one of claims 1 to 9,
    characterised in that
    - the security film (1) is adhered to the substrate (14),
    - and the security film (1) is then printed by means of a contactless process, which causes a local weakening of the barrier layer (6) and hence a selective migration of the identification medium (3) from the security film (1) to the substrate (14).
  11. Method of printing a security film which can be adhered to a substrate, as claimed in one of claims 1 to 9,
    characterised in that
    - the security film (1) is printed by means of a contactless process, which locally weakens the barrier layer (6) so that the diffusion properties of the identification medium (3) in the security film (1) are locally altered,
    - and the security film (1) is then adhered to a substrate (14).
  12. Use of a security film as claimed in one of claims 1 to 9,
    characterised in that
    the security film (1) is used to mark motor vehicles and/or parts thereof and/or accessories thereof.
  13. Use of a security film as claimed in one of claims 1 to 9,
    characterised in that
    the substrate (14) is a vehicle paint.
EP00910629A 1999-03-05 2000-01-29 Safety adhesive foil as identification element Expired - Lifetime EP1159723B8 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19909723A DE19909723C5 (en) 1999-03-05 1999-03-05 Security adhesive foil as identification carrier
DE19909723 1999-03-05
PCT/EP2000/000724 WO2000054243A1 (en) 1999-03-05 2000-01-29 Safety adhesive foil as identification element

Publications (3)

Publication Number Publication Date
EP1159723A1 EP1159723A1 (en) 2001-12-05
EP1159723B1 true EP1159723B1 (en) 2004-04-28
EP1159723B8 EP1159723B8 (en) 2009-06-03

Family

ID=7899827

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00910629A Expired - Lifetime EP1159723B8 (en) 1999-03-05 2000-01-29 Safety adhesive foil as identification element

Country Status (6)

Country Link
US (1) US6953206B1 (en)
EP (1) EP1159723B8 (en)
JP (1) JP4480118B2 (en)
DE (2) DE19909723C5 (en)
ES (1) ES2218136T3 (en)
WO (1) WO2000054243A1 (en)

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Also Published As

Publication number Publication date
DE50006254D1 (en) 2004-06-03
ES2218136T3 (en) 2004-11-16
JP4480118B2 (en) 2010-06-16
DE19909723C1 (en) 2000-09-07
JP2002539478A (en) 2002-11-19
EP1159723B8 (en) 2009-06-03
US6953206B1 (en) 2005-10-11
EP1159723A1 (en) 2001-12-05
DE19909723C5 (en) 2004-04-15
WO2000054243A1 (en) 2000-09-14

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