EP2197687A1 - Autocollant à coller sur un objet - Google Patents

Autocollant à coller sur un objet

Info

Publication number
EP2197687A1
EP2197687A1 EP08802371A EP08802371A EP2197687A1 EP 2197687 A1 EP2197687 A1 EP 2197687A1 EP 08802371 A EP08802371 A EP 08802371A EP 08802371 A EP08802371 A EP 08802371A EP 2197687 A1 EP2197687 A1 EP 2197687A1
Authority
EP
European Patent Office
Prior art keywords
layer
sticker according
sticker
layer arrangement
storage layer
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.)
Withdrawn
Application number
EP08802371A
Other languages
German (de)
English (en)
Inventor
Tobias Kresse
Steffen Noehte
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.)
Scribos GmbH
Original Assignee
Tesa Scribos GmbH
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 Tesa Scribos GmbH filed Critical Tesa Scribos GmbH
Publication of EP2197687A1 publication Critical patent/EP2197687A1/fr
Withdrawn legal-status Critical Current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
    • G09F3/08—Fastening or securing by means not forming part of the material of the label itself
    • G09F3/10—Fastening or securing by means not forming part of the material of the label itself by an adhesive layer
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/0252—Laminate comprising a hologram layer
    • G03H1/0256—Laminate comprising a hologram layer having specific functional layer
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2250/00—Laminate comprising a hologram layer
    • G03H2250/10—Laminate comprising a hologram layer arranged to be transferred onto a carrier body
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2250/00—Laminate comprising a hologram layer
    • G03H2250/33—Absorbing layer

Definitions

  • the present invention relates to a sticker for adhering to an object having the features of the preamble of claim 1.
  • Labels of the type mentioned are known from the prior art and are commonly used for marking objects, such as packaging.
  • a sticker can be flat and flat in its simplest form, so that it can be glued to the object in the manner of a label with its underside forming the contact surface to the characterizing object.
  • such a sticker can be endless, that is designed in the form of an adhesive tape, which is cut to length in use to any length.
  • the contact surface of the sticker is formed from an adhesive layer.
  • Such an adhesive layer can be formed for example by a self-adhesive layer, which is provided in the form of an adhesive or film as an adhesive layer.
  • the sticker with its contact surface is pressed onto the object.
  • holograms as an authenticity feature on documents such as credit cards or check cards, but also on other products, containers and packaging.
  • a hologram distributed over the surface of the hologram is optical phase information about an object from which an image of the object can be reconstructed when irradiated with light, in particular coherent light from a laser.
  • the holograms usually arranged on credit cards are so-called white-light holograms which, even when illuminated with natural light, display a three-dimensional image of the object shown.
  • holograms and embossed holograms are widespread, in which a re structure is embossed in the surface of a material, at which the light used to reproduce the object accordingly the phase information stored in the hologram is diffracted so that the reconstructed image of the object is produced by interference effects.
  • Such holograms are either expensive to produce and / or allow only a reasonable amount of effort to produce a large number of identical holograms. In this respect, such holograms can be used only to a limited extent as an authenticity feature.
  • DE 100 39 370 A1 discloses a holographic data memory designed as a sticker, which makes it possible to store individual holographic information.
  • the individual information in particular individualized information adapted to the respective object to be marked, is written in the form of a computer-generated hologram into a storage layer by means of a laser lithograph.
  • Such a configuration is also shown in DE 101 28 902 A1.
  • the storage layer arrangement is formed in such data stores, for example and as described above, from a biaxially stretched polymer film and an absorber layer assigned to the polymer film.
  • the storage layer arrangement is exposed pointwise in accordance with the information to be written in by means of a laser beam (writing beam).
  • a sufficient proportion of the laser beam (writing beam) is absorbed in the absorber layer.
  • the absorber layer heats up locally and transfers this heat locally to the polymer film.
  • the polymer film experiences a local change in the optical properties, as a result of which the information is imaged in the polymer film and / or in the absorber layer.
  • the heating of the absorber by means of the writing beam causes a transparency of the absorber or another suitable change of the material in a light-diffractive or refractive property.
  • the writing beam In order for the polymer film to receive sufficient heat, it is necessary for the writing beam to be locally absorbed to a sufficient extent. The absorption must be close to the surface, so that a more effective heating in a small volume is possible.
  • the absorber layer generally has a low thermal conductivity. The low thermal conductivity is also helpful to write information locally, so make only pointwise structural changes in the storage layer. The absorption during the writing of information is therefore essentially a surface effect of the absorber layer.
  • the Absorber layer are bleached locally, which also increases the contrast when reading information from the storage layer arrangement.
  • Stickers with a storage layer arrangement into which information can be introduced are known, for example, from DE 10 2005 053 508 A1 and as internal prior art from DE 10 2007 006 119.
  • information is stored by a change in optical property in the memory layer array.
  • the information is written locally by means of a laser lithograph in the memory layer arrangement.
  • the memory layer arrangement is irradiated with electromagnetic radiation, the information previously written in as a function of the optical properties of the memory layer at the irradiated point then results in reflection and / or transmission.
  • Such computer-generated holograms consist of one or more layers of dot matrices or point distributions which, when exposed to a preferably coherent light beam, lead to a reconstruction of the information encoded in the hologram.
  • the point distribution can be designed as an amplitude hologram or phase hologram and calculated, for example, as a kinoform, Fourier or Fresnel hologram or in any other coding structure.
  • a CGH can be stored as a phase hologram by changing the local properties of, for example, a polymer carrier.
  • a CGH can be stored by structuring, for example, an aluminum layer in it.
  • the storage can take the form of an amplitude hologram (holes in the aluminum layer) or a phase hologram by deformation of the aluminum layer (relief holograms) respectively.
  • this patterning is accompanied by deformation of adjacent materials, such as polymer carriers, adhesives, or the like.
  • the calculation of computer-generated holograms can be done individually, ie for each object to be identified unique.
  • the resolution of the dot matrix of a computer-generated hologram may be in the range below 0.1 ⁇ m.
  • holograms with a high resolution can be written in a small space, the information of which can be read out by illuminating with a light beam and reconstructing the diffraction image.
  • the size of the holograms can be between less than 1 mm 2 and several cm 2 .
  • an absorber associated with the storage film can be helpful for a laser writing process.
  • it may also be important to provide a suitable absorber in the product containing the storage film which is helpful in reading holographic information, in particular individual holographic information.
  • materials in which holograms are introduced are usually mirrored. Depending on the degree of reflection, a portion of the incident light is reflected at the mirror layer and a portion is transmitted. The transmitted light can then be scattered on a Verklebungsuntergrund, so falls undirected back to the observer. This scattered light superimposes the light diffracted on the holographic structure, so that the appearance of the hologram may be impaired.
  • an adhesive layer with which the hologram is applied to a bonding substrate, a scattered light absorber, jet sump, can be admixed, which absorbs the rays passing through the upper layers and thus prevents unwanted backscattering.
  • a scattered light absorber, jet sump Such products, in which this is realized, are known from the prior art. It has been found that a dye which is mixed with an adhesive which is located below the storage medium basically fulfills this task in an outstanding manner. It is also known, for example, from US Pat. No. 4,841,652 that migratable dyes contained in the adhesive can be advantageously used to realize a further safety aspect. It makes use of the fact that small amounts of the dye can be transferred on contact with the bonding substrate on this.
  • the present invention is therefore based on the problem of specifying a sticker which is optimized with regard to the readability of stored information.
  • the readout of information stored in the memory layer arrangement can be permanently optimized. For this purpose, it is provided that between the
  • a scattered light absorber is provided with the function of a so-called jet sump.
  • the jet sump is used during
  • the scattered light absorber or the scattered light absorber layer and the jet sump on the one hand whose function is the absorption of unwanted scattered light when reading the information
  • the absorber layer on the other hand as known from the prior art for data storage and laser-written computer-generated holograms whose function is to support the writing process.
  • the jet sump itself is designed in such a way that it remains substantially unchanged both in the event of a possible writing process by means of a laser and also during the reading out of the information, that is, in particular, there is essentially no fading or blooming. However, this does not preclude a slight deformation of the jet sump, which possibly accompanies the writing process of a CGH.
  • a slight deformation may also experience other layers adjacent to the storage layer arrangement, such as polymer carriers, adhesives or the like.
  • the jet sump is thus resistant in particular to the writing laser and the readout beam. This can be realized on the one hand by the fact that the jet sump does not or hardly absorbs the light of the writing beam. In addition, one can take advantage of the fact that the light is absorbed in the volume and not on a thin boundary layer. The local heating by absorption is therefore generally much lower here than is the case with an absorption layer provided for writing processes, for example according to DE 100 39 370.
  • the requirement for the jet sump with respect to its stability can additionally or solely be realized by a writing laser is not focused on the area in which the beam sump is present, so that acts there a lower power density.
  • the jet sump can in particular be formed as a black layer and thus suitable for reading beams of different wavelengths (color).
  • the jet sump can also be tuned to the wavelength (color) of individual read beams. He then has, for example, the corresponding complementary color, so absorbs the reading beam.
  • the jet sump can also be blue, in particular for reading with a red laser.
  • the jet sump should be arranged essentially over the whole area underneath the storage layer arrangement. Depending on the design, however, it can be structured and, for example, include a logo font, characters. In this case, the jet sump can be monochrome, multicolored or black / white. In any case, the jet sump should be arranged over the entire surface at least below the surface of the storage location. Furthermore, it may be advantageous. If the jet sump, in particular therefore the scattered light absorber layer, has a uniform layer thickness in order to allow a constant reading quality regardless of location.
  • the scattered light absorber layer a is provided for this purpose that the scattered light absorber layer a
  • the layer thickness should not be too large, so as not to over-apply the sticker.
  • larger layer thicknesses are advantageously used in the context of this invention.
  • a jet sump according to the invention has an OD greater than 0.3, in particular greater than 0.8 and less than 8.0, in particular less than 5.0, very particularly less than 2.0, in particular in the range of the readout wavelength, ie usually in the visible spectral range ,
  • the jet sump is designed in particular as an additional foil.
  • a film is preferably formed as a color foil, that contains in an appropriate concentration
  • Color pigments but as a film, for example, is also a light-scattering film.
  • Arrangement without a jet sump is actually reduced.
  • An example of such a scattering film as a jet sump is a polytetrafluoroethylene film.
  • jet sump is formed as a film, in particular as a color film, it should be between a clear, in particular thin, adhesive layer and the
  • Storage layer arrangement may be arranged.
  • Such a sticker can be produced particularly easily by lamination of the film and thus requires no additional production equipment.
  • the film itself will not be big
  • the film only has to be designed so that when writing information and reading out this information, that is usually during irradiation with
  • the jet sump can be realized as a colored or black print and / or as a colored or black coating.
  • the jet sump is as realized colored or black foil.
  • the colored or black film may either be dyed by itself or carry a colored layer at the top and / or bottom. Each of these layers, in turn, can be realized by way of a printing and / or coating method known per se.
  • a print may preferably be realized as a flexographic or screen printing process.
  • a coating may preferably be realized as a lacquer, laminating adhesive, self-adhesive layer, sealing compound or sealing film. If the film carries at least one color layer, then it may itself be colorless.
  • the jet sump is a foil-based layer, then it advantageously has a thickness of 1 ⁇ m to 200 ⁇ m, preferably between 10 ⁇ m and 150 ⁇ m.
  • printing inks known to the person skilled in the art are suitable, for example those which can be obtained commercially from the companies Sun Chemical, XSYS-Printsolutions or Siegwerk.
  • An example of printing inks suitable for the purposes of this invention is UV-curable flexographic inks.
  • colored films it is possible to use all films known to those skilled in the art which carry and / or contain a colorant. Examples which may be mentioned are polyolefin-based, in particular polypropylene-based, polyester-based, in particular polyethylene terephthalate-based, poly (meth) acrylate-based, in particular polymethyl methacrylate-based, polystyrene-based, polycarbonate-based or polyamide-based films.
  • Films can optionally carry additional functional layers, one-sided or two-sided. They can be physically pretreated on one or both sides, also in combination with optional functional layers, so that, for example, the adhesion of contact layers can be adjusted as desired.
  • the colorants used in the jet sump are preferably immiscible and not extractable. They may be dyes or colored pigments and also any combinations of different dyes and color pigments.
  • an adhesive layer in particular a self-adhesive layer
  • an intermediate layer is arranged between the storage layer arrangement and the jet sump. This intermediate layer spaces the jet sump from the storage layer and thus prevents the jet sump from undesirably interfering with and disturbing the writing process, for example by heating. At the same time it ensures that the dye is not in the focus of the writing laser beam, as long as it is a laser marking process.
  • the intermediate layer can be realized in the form of a coating, in the form of a printing or in the form of a laminate.
  • a print may preferably be realized as a flexographic or screen printing process.
  • a coating may preferably be realized as a lacquer, laminating adhesive, self-adhesive layer, sealing compound or sealing film.
  • the intermediate layer is substantially colorless and transparent to the wavelength used for reading.
  • the layer thickness can be 0.5 ⁇ m to 5 ⁇ m, in particular if the intermediate layer is realized by means of a flexographic printing process. Other methods can also be used in this layer thickness range according to the invention.
  • the layer thickness can be 5 ⁇ m to 20 ⁇ m, in particular if the intermediate layer is realized by means of a screen printing process.
  • the layer thickness may be 20 ⁇ m to 50 ⁇ m or more, in particular when the intermediate layer is realized by means of an adhesive coating method. Other methods can also be used in this layer thickness range according to the invention.
  • Suitable printing lacquers are known, for example, from the companies Sun Chemical, XSYS-Printsolutions or Siegwerk and are commercially available.
  • all foils which are known to the person skilled in the art and which are at least partially transparent to the reading beam can be used as foils. Examples which may be mentioned are polyolefin-based, in particular polypropylene-based, polyester-based, in particular polyethylene terephthalate-based, poly (meth) acrylate-based, in particular polymethyl methacrylate-based, polystyrene-based, polycarbonate-based or polyamide-based films. Films can optionally carry additional functional layers, one-sided or two-sided. Both the films and possibly further provided functional layers can be used as required be physically pretreated on one or both sides, so that, for example, the adhesion of contact layers can be adjusted as desired.
  • the storage layer arrangement is an arrangement of one or more layers for storing information.
  • a multilayer structure it is possible for several layers to be themselves provided for storing information, but it is also possible to provide further functional layers, for example a protective layer, a carrier, adhesive layers or the like.
  • the storage layer assembly may then form the carrier of the sticker as a whole. Thus, no additional carrier material is required, which limits the complexity of the label.
  • the storage layer arrangement has a polymer film which on the one hand can serve as a storage layer, but on the other hand also assumes the self-supporting function of the storage layer arrangement.
  • the memory layer arrangement has a metal layer into which the information can be written.
  • the metal layer is provided in particular as a metallic coating of the polymer film. Steaming or sputtering processes are mentioned as suitable production processes.
  • the layer thickness is preferably at least 2 nm, more preferably at least 4 nm and / or at most 15 nm, preferably at most 10 nm.
  • Fig. 2 is a schematic representation of a sticker according to the invention
  • Fig. 3 is a schematic representation in exploded view of an alternative embodiment of a sticker according to the invention
  • 1 shows a sticker known from the prior art which has a polymer film (5) and a metal layer (6) as part of a storage layer arrangement (1) and to which an absorber layer (7) is assigned.
  • information can be introduced as an optical structure.
  • the absorber layer serves to locally absorb a writing beam and to deliver the resulting heat locally to the environment, ie to the metal layer (6) and the polymer film (5). Due to the heat transfer then takes place locally a structural change. This structural change can then be read out again as information.
  • Below the absorber layer (7) an adhesive layer (2) for applying the sticker is arranged on any object. In order to avoid disturbing scattered light influences when reading the information, the adhesive layer (2) may be mixed with a scattered light absorber.
  • a sticker according to the invention is shown.
  • Such stickers are especially as a security label on an object is glued.
  • Such a sticker is suitable because of the ability to write individual information, such as origin, type, distribution channel and / or production of the object to be secured in the storage layer arrangement (1), in particular for marking objects or packages at each level of trade.
  • the sticker has a storage layer arrangement (1) into which information can be introduced as an optical structure (FIG. 2). Below the storage layer arrangement (1) an adhesive layer (2) is arranged.
  • the sticker can be affixed to an object, such as a package, by means of the adhesive layer (2).
  • the adhesive layer (2) is, for example, an adhesive layer in the form of an adhesive or film based on a self-adhesive adhesive (pressure-sensitive adhesive layer).
  • a jet sump (3) is arranged, which is designed here as a full-surface layer.
  • the jet sump (3) is thus no longer mixed with the adhesive layer (2), as is known from the prior art, but rather provided as a separate layer.
  • the jet sump (3) can thus be embedded in any matrix and thus also better adapted to the respective requirements of the product. In particular, that may be possible unwanted transition of color molecules are prevented on the bonding substrate.
  • the jet sump (3) is here and preferably formed as a color foil. This color film (3) here has a layer thickness of about 30 microns.
  • the storage layer arrangement (1) is connected to the color film (3) by means of a second adhesive layer (4).
  • This second adhesive layer (4) may be formed such that the adhesive force between the jet sump (3) and the storage layer arrangement (1) is greater than the bond between the jet sump (3) and the pasted object. This would ensure that the information from the sticker itself even after a possible detachment from the object to be secured still without disturbing stray light influences can be read. Adhesive forces can also be balanced so that this is precisely not possible.
  • the storage layer arrangement (1) is formed here from a polymer film (5) and a metal layer (6).
  • the metal layer (6) is a metal, in particular an aluminum, coating of the polymer film (5) with a layer thickness of approximately 6 nm.
  • the metal coating was produced by vapor deposition of the polymer film (5), but other methods are also possible. such as, for example, sputtering the metal layer (6) onto the polymer film (5).
  • Fig. 3 shows a comparison with the embodiment shown in Fig. 2 of a sticker according to the invention slightly modified embodiment.
  • the sticker initially again has the storage layer arrangement (1) containing the polymer film (5) and the metal layer (6).
  • jet sump (3) and the adhesive layer (2) are also provided.
  • the jet sump (3) is again formed here as an independent layer, in particular in the form of a colored foil.
  • an intermediate layer (8) is additionally arranged.
  • This intermediate layer (8) spaces the jet sump (3) from the storage layer arrangement (1) and thus in particular prevents unwanted heating of the storage layer arrangement (1) during the reading out of the information from the sticker.
  • the intermediate layer (8) is in particular substantially transparent and colorless, in any case with respect to the reading beam.
  • the reading beam can penetrate the intermediate layer (8) substantially undisturbed and, as intended, be absorbed by the jet sump (3) in order to prevent the formation of stray light during readout.
  • the intermediate layer (8) may be formed, for example, as a print, as a film or the like.
  • Their layer thickness should, however, be at least 0.5 .mu.m, preferably at least 2 .mu.m, more preferably at least 10 .mu.m and / or at most 200 .mu.m, preferably at most 150 .mu.m.
  • the above-described stickers according to the invention are particularly suitable for storing computer-generated holograms that can be read in reflection.
  • the problem of disturbing scattered light occurs increasingly when reading holograms, as to read the information, the diffraction images are considered.
  • the intensity of the diffraction images is often relatively low, so that stray light influences have a great influence on the readability and should be largely avoided.
  • the sticker according to the invention is suitable.
  • read-out in transmission is made more difficult by the jet sump (3), since, in addition to the unwanted scattered light, the read-out beam itself is also absorbed in the transmission direction. In the reflection direction, however, the jet sump (3) does not reduce the intensity of the read-out beam, but only causes an absorption of the disturbing scattered light. Accordingly, the previously described labels are particularly suitable for reading out information in the reflection direction.
  • Stickers according to the invention containing holograms, and in particular individualized computer-generated and laser-written holograms, can advantageously be used as an authenticity feature for any packaging, container, document or other product.

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
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  • Credit Cards Or The Like (AREA)

Abstract

La présente invention a pour objet un autocollant à coller sur un objet, doté d'un ensemble de couches de mémoire (1) dans lequel des informations peuvent être introduites sous forme de structure optique et d'une couche adhésive (2) aménagée en dessous de l'ensemble de couches de mémoire (1), à l'aide de laquelle l'autocollant peut être collé sur un objet. La présente invention propose qu'un absorbeur de rayons (3) soit disposé entre l'ensemble de couches de mémoire (1) et la couche adhésive (2) et que l'absorbeur de rayons (3) soit conçu de manière à demeurer sensiblement inchangé lors de l'introduction et de la lecture des informations dans l'ensemble de couches de mémoire (1).
EP08802371A 2007-10-08 2008-09-19 Autocollant à coller sur un objet Withdrawn EP2197687A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007048193A DE102007048193A1 (de) 2007-10-08 2007-10-08 Aufkleber zum Aufkleben auf ein Objekt
PCT/EP2008/007855 WO2009046836A1 (fr) 2007-10-08 2008-09-19 Autocollant à coller sur un objet

Publications (1)

Publication Number Publication Date
EP2197687A1 true EP2197687A1 (fr) 2010-06-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP08802371A Withdrawn EP2197687A1 (fr) 2007-10-08 2008-09-19 Autocollant à coller sur un objet

Country Status (3)

Country Link
EP (1) EP2197687A1 (fr)
DE (1) DE102007048193A1 (fr)
WO (1) WO2009046836A1 (fr)

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DE102008024023A1 (de) * 2008-05-16 2009-11-19 Tesa Scribos Gmbh Mehrschichtige Folienanordnung sowie Verwendung einer mehrschichtigen Folienanordnung
DE102012213502B4 (de) * 2012-07-31 2022-12-22 Scribos Gmbh Heißsiegelfolie

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