EP2276637B1 - Method for producing a multi-coloured laser-inscribable film - Google Patents

Method for producing a multi-coloured laser-inscribable film Download PDF

Info

Publication number
EP2276637B1
EP2276637B1 EP09782323A EP09782323A EP2276637B1 EP 2276637 B1 EP2276637 B1 EP 2276637B1 EP 09782323 A EP09782323 A EP 09782323A EP 09782323 A EP09782323 A EP 09782323A EP 2276637 B1 EP2276637 B1 EP 2276637B1
Authority
EP
European Patent Office
Prior art keywords
laser
printing
layer
lacquer
layers
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.)
Not-in-force
Application number
EP09782323A
Other languages
German (de)
French (fr)
Other versions
EP2276637A1 (en
Inventor
Michael Siebert
Philipp Preuß
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
Original Assignee
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 Tesa SE filed Critical Tesa SE
Publication of EP2276637A1 publication Critical patent/EP2276637A1/en
Application granted granted Critical
Publication of EP2276637B1 publication Critical patent/EP2276637B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/24—Ablative recording, e.g. by burning marks; Spark recording
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/02—Letterpress printing, e.g. book printing
    • B41M1/04—Flexographic printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/14—Multicolour printing
    • B41M1/18—Printing one ink over another
    • 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
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
    • 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
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
    • Y10T428/2495—Thickness [relative or absolute]
    • Y10T428/24967—Absolute thicknesses specified

Definitions

  • the invention relates to methods for producing a multi-color laser-inscribable film and a multi-color laser-inscribable film and a laser-writable label from the multi-color laser-inscribable film.
  • EP 1 440 133 B1 a method for producing a laser-inscribable film which meets the above requirements is known.
  • This laser-writable film is self-supporting, but is produced on a process carrier, the so-called support carrier film.
  • a thin layer of a UV-curable printing lacquer is first printed on the process carrier.
  • This printing lacquer layer then forms the laser-inscribable layer, also referred to as an engraving layer.
  • a thicker layer of an electron beam curable acrylate varnish is applied to this print varnish layer. After curing by means of an electron beam method, the acrylate lacquer layer forms the Carrier of the laser-writable film and the process carrier can be removed.
  • the thick acrylate lacquer layer has a color which is as different as possible from the printing lacquer layer and of high contrast. After a partial removal of the printing lacquer layer by laser irradiation for inscription, the acrylate lacquer layer appears at the points at which the printing lacquer layer has been removed, and the inscription is thus visible.
  • a multicolor of the laser-inscribable film is described in that printing varnish layers of different colors can be arranged next to each other and consequently a different color design can be achieved in some areas.
  • a similar product structure also shows the DE 100 48 665 A1 in which a laser-inscribable layer based on an electron beam-curable (ESH) acrylate varnish is provided.
  • the acrylate lacquer contains an additive which shows a color change under laser irradiation, thus forming a label.
  • additional colorant additives may also be included in the acrylate paint layer, such as titanium dioxide for a white paint layer.
  • laser-writable films are known in which pigments, such as, for example, metal oxides or carbon black, are added as laser absorbers ( DE 10 2004 057 918 A1 . WO 2004/045857 A2 . WO 2005/033218 A1 ).
  • multilayer laminates are known from the prior art, which allow multi-color labeling by means of laser irradiation.
  • the individual laminate layers must be made relatively thick in order to avoid unintentional labeling of the layer arranged immediately below the layer to be inscribed, or transparent buffer layers must be introduced between two color layers. In both cases, a fast laser marking due to the mass of the material to be removed is not possible and also the production of the laminate very expensive and expensive.
  • the US 6,169,266 B2 describes a multicolor laser-writable film.
  • the marking of the film takes place by means of laser. Instead of making a statement about the absorption rates of individual layers, describes the US 6,169,266 B2 in that the depth of the respective marking can be controlled by the energy input of the laser. From the EP 0 802 064 A1 as well as the DE 103 26 501 A1 Multicolor laser-writable films are also known.
  • the present invention is therefore based on the problem to provide a multi-color laser-writable film that is both easy to manufacture, as well as a fast and process-stable laser marking allows.
  • the teaching of the invention is initially based on the fundamental knowledge that it is possible to apply not only a single printing ink layer on a substrate, but also for multicolor laser marking a plurality of printing ink layers one above the other, each independently. This possibility has hitherto not been recognized, since the application of several pressure varnish layers not only requires a precise matching of the printing process with respect to each printing varnish layer, but also a well-defined laser absorption in each of the color layers, which should be largely homogeneous over the entire printing varnish layer composite.
  • a lacquer layer is here and hereinafter referred to as the printing lacquer layer which is printed, in particular by means of a flexographic printing process.
  • a printing ink layer in this sense is an engraving layer, i.
  • a marking can be introduced into the printing lacquer layer by means of laser irradiation, for example by local removal of the engraving layer, a local change in the optical properties (for example reflection, transmission, color) or the like.
  • pressure-lacquer coatings offer the advantage over other lacquer coatings and also over laminate coatings that they can be applied relatively thinly. This leads to the possibility of faster laser marking, since a thinner layer can be labeled faster due to the lower mass removal during laser marking.
  • printing lacquer layers are applied with a mass application of about 1 g / m 2 to about 3 g / m 2
  • the application of ESH acrylate lacquer layers is usually at least about 10 g / m 2 .
  • the pressure-varnish layers enable a flexible / arbitrary coloring in a simple manner.
  • multi-colored inscriptions can then be achieved by the laser inscription takes place in such a way that locally one or more of the printing lacquer layers are removed by laser irradiation, so that the respectively underlying layer shines through.
  • the problem with laser inscription now is to ensure that the material allows accurate laser marking, ie that a layer removal of each individual layer is completed, but the underlying layer is not removed.
  • the absorption coefficient of the respective pressure-lacquer layers is as uniform as possible with respect to one another.
  • the absorption rate of each print varnish layer for conventional wavelengths in laser inscription deviates by not more than 20%, preferably not more than 15%, more preferably not more than 10%, from the absorption rate of the further print varnish layers.
  • this reference value for the absorption coefficient relates to the wavelength of about 1064 nm typical for a Nd: YAG laser. In the present case, this can be achieved, in particular, by a corresponding adjustment of the respective proportion of titanium dioxide and / or carbon black within the printing ink layer.
  • Both additives are characterized as good laser absorbers.
  • these two additives are characterized by a good compatibility with the other components of printing varnishes.
  • titanium dioxide and / or carbon black as laser absorbers, it is also possible to use a printing varnish of any color.
  • the actual coloring pigment of the printing varnish no longer needs to fulfill special absorption properties with respect to the interaction with the laser radiation.
  • a laser-printable printing ink layer can thus be formed as a yellow printing ink layer. In the past, this was not possible with other systems or only with great effort.
  • the pressure-lacquer layers are each arranged directly above one another, ie no further intermediate layers are provided.
  • the individual pressure-lacquer layers are based on UV-curing printing lacquers. This allows a particularly simple and fast drying of the respective printing ink layers.
  • each printing ink layer is cured before printing by the next printing ink layer. This can ensure that a thorough mixing of the individual printing ink layers and thus mixing of the respective colors is avoided.
  • the curing can take place, for example, by UV irradiation, electron-beam curing, thermal treatment or the like.
  • the carrier to which the print varnish layers are applied is a process carrier which is removed again after the application and hardening of the print varnish layers.
  • a process carrier which is removed again after the application and hardening of the print varnish layers.
  • an additional permanent carrier can also be provided. If the layer sequence initially provided, for example, for production reasons, should be present in the end product in reverse order, then the permanent support is laminated onto the pressure-lacquer layers after curing and the process carrier is subsequently removed.
  • the individual pressure-lacquer layers can each be applied over the entire surface or even only partially, for example in the form of a logo or the like.
  • titanium dioxide a proportion of at least 5%, preferably at least 10% has been found.
  • carbon black proportions of at least 2%, preferably at least 4, have been found to be optimal.
  • the printing ink layer is formed as free as possible from thickness fluctuations.
  • the layer thickness does not differ by more than 10% from the average layer thickness.
  • Such a layer thickness quality is special good by the printing of the printing ink layers achievable, especially in the flexographic printing process.
  • the printing ink layer has a layer thickness between 1 .mu.m and 10 .mu.m, preferably between about 1 .mu.m and about 5 .mu.m.
  • the layer thickness of the carrier is preferably between about 50 microns and about 200 microns.
  • all films and composite film systems come into question as carriers.
  • polymer films such as polyethylene film, PVC film or the like are suitable.
  • the carrier only a good adhesion of the printing ink layer should be ensured on this.
  • this can be done by applying an additional primer, as is known in the art.
  • the laser-writable film is formed as an adhesive film, in particular as a self-adhesive film, by applying an adhesive layer.
  • the adhesive layer may be based on any adhesives known from the prior art, in particular on so-called pressure-sensitive adhesives. If the laser-inscribable film has a permanent carrier, the adhesive layer is preferably applied to the side of the carrier opposite the printing-lacquer layers for reasons of simple production. Alternatively, the adhesive layer can also be applied to the uppermost lacquer layer. In this case, however, the carrier should also be laser-inscribable so that the inscription can be made through the carrier.
  • This arrangement has the advantage that a detachment of the film after bonding without a break of the paint layers and thus an inscribed there identifier is not possible.
  • the pressure varnish layers themselves can in fact be set very brittle and thus can not be detached without damage without the help of a carrier after bonding.
  • the carrier is arranged above the lacquer layers, the print lacquer layers are damaged during a manipulation attempt.
  • the composite of the printing lacquer layers described above is preferably not only laser-inscribable, but also laser-cut, ie by laser irradiation a separation of all layers can take place.
  • the carrier should be formed by laser cutting. This makes it possible for the customer of the laser-writable films to label them individually and at the same time to cut out of the film a label with the desired dimensions.
  • a laser-printed label formed in this way has in particular a multicolored individualized identification, such as a serial number, a barcode or the like.
  • the laser cutting of the label also allows the adaptation of the shape in the desired manner.
  • the label may also have an individualized shape, for example with the outer shape of an alphanumeric identifier, one or more spaced-apart recesses on the label edge or the like.
  • This correlation can consist, for example, in the fact that the marking is completely or partially reflected in the form or that the marking and the individualized form only reproduce the complete information together.
  • Fig. 1 shows a laser-writable film 1 with a support 2, a first lacquer layer 3 and a further lacquer layer 4.
  • the support 2 is provided here as a permanent support of the film 1 and is made of an approximately 100 micron thick film of polyethylene educated. However, such an additional carrier is not required.
  • the lacquer layers 3, 4 or other layers can rather take over their function.
  • the two paint layers 3, 4 are formed over the entire surface. They are each formed from a pressure varnish, in the present case a UV-curable printing varnish.
  • the printing varnish for the varnish layer 3 was printed on the substrate 2 in the flexographic printing process.
  • the layer thickness was about 3 microns.
  • the printing lacquer layer 3 was cured by means of UV radiation.
  • the printing varnish for the printing varnish layer 4 was printed on the cured printing varnish layer 3 in a flexographic printing process, with a layer thickness of about 4 ⁇ m.
  • the printing lacquer layer 4 was cured by means of UV radiation.
  • the carrier 2 is formed white, whereas the printing ink layer 3 is red and the printing ink layer 4 is formed yellow.
  • the coloring of the printing lacquer layers takes place by way of color pigments in the printing lacquers.
  • the printing varnishes of the printing varnish layers 3, 4 additionally comprise titanium dioxide or carbon black as laser absorber.
  • the printing lacquer layers 3, 4 are particularly suitable as gravure layers, so they can be labeled locally by laser irradiation. When labeling the laser radiation is absorbed locally and initially the upper printing lacquer layer 4 partially removed. Subsequently or during the same inscription passage, the underlying printing lacquer layer 3 can also be removed by laser irradiation.
  • the extent to which one or more printing lacquer layers 3, 4 are removed in one pass or in succession can be controlled by a suitable choice of the laser parameters (pulse duration, intensity). In the present case a lettering in the colors yellow, red and white is possible.
  • the printing lacquer layer 3 has a proportion of 10% titanium dioxide and a proportion of 0.1% carbon black.
  • the printing ink layer 4 has a proportion of 15% titanium dioxide and a proportion of 0.1% carbon black.
  • the admixture of carbon black is solely the color design and not the laser absorption, which is completely done by the sufficient admixture of titanium dioxide.
  • the absorption coefficient is formed very homogeneously within a printing lacquer layer.
  • the absorption rates of the individual printing lacquer layers 3, 4 do not differ significantly from one another.
  • the absorption rate of the printing lacquer layer 3 is about 14% lower than the absorption rate of the printing lacquer layer 4.
  • the absorption rates should not differ by more than 20% from one another.
  • Fig. 2 shows an alternative embodiment of a laser-writable film 1 in the form of a label.
  • This label 1 in turn has a carrier 2, on which two paint layers 3, 4 are arranged.
  • the lacquer layer 3 is not the entire surface but only partially, in particular in the form of a logo formed.
  • the pressure varnish layer 4 is formed over the entire surface, thus covering the printing varnish layer 3 and the support 2.
  • both printing lacquer layers 3, 4 each have titanium dioxide and carbon black as laser absorber, so that the two printing lacquer layers 3, 4 are again formed as engraving layers.
  • a colored inscription is thus possible in turn by local removal of one or both printing lacquer layers 3, 4.
  • the pressure-lacquer layer 4 is also not opaque, the pressure-lacquer layer in the form of the logo also appears independent of the laser inscription.
  • another feature can be introduced. In particular, since the feature is placed beneath the surface, it can not be detected by the naked eye.
  • the label 1 additionally has an adhesive layer 5 below the carrier 2.
  • the adhesive layer 5 is based here on a pressure-sensitive adhesive and has a layer thickness of about 30 microns. By means of this adhesive layer 5, the label 1 can be fixed on any surface.
  • the label 1 is also designed such that it can be cut by means of a laser, in particular by means of the same laser, which is also used for laser marking.
  • Fig. 3 shows the label 1 in plan view. It can be seen that the outer shape of the label 1 is individualized, here namely the outline of the last digit of a digit sequence is again. This shaping was realized individually together with the writing of a multi-colored marking 6.
  • the identification 6 and the individualized form are correlated with each other, in the present case namely have a matching last digits.
  • the individualized form can also be based on other types of identifications, for example on one or more indentations with the same and / or different width analogous to a barcode or the like.
  • the correlation can also be that information is partially or completely repeated, if necessary, in encrypted form.
  • the correlation may consist in the fact that the two pieces of information complement each other only to a complete information.

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Laminated Bodies (AREA)
  • Printing Methods (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)

Description

Die Erfindung betrifft Verfahren zur Herstellung einer mehrfarbig laserbeschriftbaren Folie sowie eine mehrfarbig laserbeschriftbare Folie und ein laserbeschriftbares Etikett aus der mehrfarbig laserbeschriftbaren Folie.The invention relates to methods for producing a multi-color laser-inscribable film and a multi-color laser-inscribable film and a laser-writable label from the multi-color laser-inscribable film.

Zur Kennzeichnung von Teilen an Fahrzeugen, Maschinen, elektrischen und elektronischen Geräten, Verpackungen usw. finden zunehmend technische Etiketten Verwendung, so zum Beispiel als Typenschilder, als Steueretikett für Prozessabläufe, als Verpackungsetikett oder als Garantie- und Prüfplaketten. Um derartige Schilder oder Etiketten zu beschriften, werden weit verbreitet leistungsfähige steuerbare Laser eingesetzt, mit deren Hilfe Markierungen wie Schriften, Codierungen und dergleichen erzeugt werden. An das zu beschriftende Material sind hohe Anforderungen gestellt. So soll die Beschriftung schnell erfolgen können, das Auflösungsvermögen soll hoch sein, die Anwendung soll einfach sein und das Material soll eine hohe Beständigkeit gegenüber mechanischen, physikalischen und chemischen Einflüssen haben. Gängige Materialien wie zum Beispiel bedrucktes Papier, eloxiertes oder lackiertes Aluminium oder PVC-Folien erfüllen nicht alle diese Anforderungen.For identification of parts of vehicles, machinery, electrical and electronic equipment, packaging, etc. increasingly find technical labels use, such as nameplates, as a control label for process flows, as a packaging label or as warranty and inspection labels. To label such signs or labels, powerful, controllable lasers are widely used to produce markers such as fonts, encodings, and the like. High demands are placed on the material to be inscribed. So the labeling should be fast, the resolution should be high, the application should be simple and the material should have a high resistance to mechanical, physical and chemical influences. Common materials such as printed paper, anodised or painted aluminum, or PVC films do not meet all of these requirements.

Aus der, den Ausgangspunkt der vorliegenden Erfindung bildenden EP 1 440 133 B1 ist ein Herstellungsverfahren für eine laserbeschriftbare Folie bekannt, die die oben genannten Anforderungen erfüllt. Diese laserbeschriftbare Folie ist selbsttragend ausgebildet, wird jedoch auf einem Prozessträger, der so genannten Stützträgerfolie, hergestellt. Hierzu wird zunächst eine dünne Schicht eines UV-härtbaren Drucklackes auf den Prozessträger aufgedruckt. Diese Drucklackschicht bildet dann die laserbeschriftbare Schicht, auch als Gravurschicht bezeichnet, aus. Auf diese Drucklackschicht wird eine dickere Schicht eines elektronenstrahlhärtbaren Acrylatlackes aufgerakelt. Nach einem Aushärten mittels eines Elektronenstrahlverfahrens bildet die Acrylatlackschicht den Träger der laserbeschriftbaren Folie aus und der Prozessträger kann entfernt werden. Die dicke Acrylatlackschicht weist zudem eine von der Drucklackschicht verschiedene, möglichst kontraststarke Farbe auf. Nach einem partiellen Entfernen der Drucklackschicht durch Laserbestrahlung zur Beschriftung scheint die Acrylatlackschicht an den Stellen durch, an denen die Drucklackschicht entfernt wurde, und die Beschriftung ist somit sichtbar. In der EP 1 440 133 B1 ist zudem eine Mehrfarbigkeit der laserbeschriftbaren Folie dahingehend beschrieben, dass Drucklackschichten unterschiedlicher Farben nebeneinander angeordnet sein können und demzufolge bereichsweise eine unterschiedliche Farbgestaltung erzielt werden kann.From, forming the starting point of the present invention EP 1 440 133 B1 For example, a method for producing a laser-inscribable film which meets the above requirements is known. This laser-writable film is self-supporting, but is produced on a process carrier, the so-called support carrier film. For this purpose, a thin layer of a UV-curable printing lacquer is first printed on the process carrier. This printing lacquer layer then forms the laser-inscribable layer, also referred to as an engraving layer. A thicker layer of an electron beam curable acrylate varnish is applied to this print varnish layer. After curing by means of an electron beam method, the acrylate lacquer layer forms the Carrier of the laser-writable film and the process carrier can be removed. In addition, the thick acrylate lacquer layer has a color which is as different as possible from the printing lacquer layer and of high contrast. After a partial removal of the printing lacquer layer by laser irradiation for inscription, the acrylate lacquer layer appears at the points at which the printing lacquer layer has been removed, and the inscription is thus visible. In the EP 1 440 133 B1 In addition, a multicolor of the laser-inscribable film is described in that printing varnish layers of different colors can be arranged next to each other and consequently a different color design can be achieved in some areas.

Einen ähnlichen Produktaufbau zeigt auch die DE 100 48 665 A1 , bei der eine laserbeschriftbare Schicht auf Basis eines elektronenstrahlhärtbaren (ESH) Acrylatlackes vorgesehen ist. Der Acrylatlack enthält dabei ein Additiv, welches unter LaserBestrahlung einen Farbumschlag zeigt, und somit eine Beschriftung ausbildet. Ferner können auch zusätzliche Additive zur Farbgebung in der Acrylatlackschicht enthalten sein, wie zum Beispiel Titandioxid für eine weiße Farbschicht. Weiter sind laserbeschriftbare Folien bekannt, bei denen Pigmente, wie zum Beispiel Metalloxide oder Ruß als Laserabsorber beigemischt werden ( DE 10 2004 057 918 A1 , WO 2004/045857 A2 , WO 2005/033218 A1 ).A similar product structure also shows the DE 100 48 665 A1 in which a laser-inscribable layer based on an electron beam-curable (ESH) acrylate varnish is provided. The acrylate lacquer contains an additive which shows a color change under laser irradiation, thus forming a label. Further, additional colorant additives may also be included in the acrylate paint layer, such as titanium dioxide for a white paint layer. Furthermore, laser-writable films are known in which pigments, such as, for example, metal oxides or carbon black, are added as laser absorbers ( DE 10 2004 057 918 A1 . WO 2004/045857 A2 . WO 2005/033218 A1 ).

Zudem sind aus dem Stand der Technik mehrschichtige Laminate bekannt, die eine mehrfarbige Beschriftung mittels Laserbestrahlung ermöglichen. Die einzelnen Laminatschichten müssen dabei relativ dick ausgebildet sein, um eine unbeabsichtigte Beschriftung der unmittelbar unterhalb der zu beschriftenden Schicht angeordneten Schicht zu vermeiden oder es müssen transparente Pufferschichten zwischen zwei Farbschichten eingebracht werden. In beiden Fällen ist eine schnelle Laserbeschriftung auf Grund der Masse des abzutragenden Materials nicht möglich und zudem die Herstellung des Laminats sehr aufwendig und teuer.In addition, multilayer laminates are known from the prior art, which allow multi-color labeling by means of laser irradiation. The individual laminate layers must be made relatively thick in order to avoid unintentional labeling of the layer arranged immediately below the layer to be inscribed, or transparent buffer layers must be introduced between two color layers. In both cases, a fast laser marking due to the mass of the material to be removed is not possible and also the production of the laminate very expensive and expensive.

Die US 6,169,266 B2 beschreibt eine mehrfarbige laserbeschriftbare Folie. Die Markierung der Folie erfolgt mittels Laser. Statt eine Aussage über die Absorptionsraten einzelner Schichten zu treffen, beschreibt die US 6,169,266 B2 , dass die Tiefe der jeweiligen Markierung durch den Energieeintrag des Lasers gesteuert werden kann.
Aus der EP 0 802 064 A1 sowie der DE 103 26 501 A1 sind ebenfalls mehrfarbige laserbeschriftbare Folien bekannt.The US 6,169,266 B2 describes a multicolor laser-writable film. The marking of the film takes place by means of laser. Instead of making a statement about the absorption rates of individual layers, describes the US 6,169,266 B2 in that the depth of the respective marking can be controlled by the energy input of the laser.
From the EP 0 802 064 A1 as well as the DE 103 26 501 A1 Multicolor laser-writable films are also known.

Der vorliegenden Erfindung liegt damit das Problem zugrunde, eine mehrfarbig laserbeschriftbare Folie zu schaffen, die sowohl leicht herzustellen ist, als auch eine schnelle und prozessstabile Laserbeschriftung ermöglicht.The present invention is therefore based on the problem to provide a multi-color laser-writable film that is both easy to manufacture, as well as a fast and process-stable laser marking allows.

Das zuvor aufgezeigte Problem wird mit einer mehrfarbigen laserbeschriftbaren Folie gemäß Anspruch 1 gelöst. Bevorzugte Ausgestaltungen und Weiterbildungen sind Gegenstand der Unteransprüche.The above-mentioned problem is solved with a multi-colored laser-inscribable film according to claim 1. Preferred embodiments and further developments are the subject of the dependent claims.

Die Lehre der Erfindung beruht zunächst auf der grundlegenden Erkenntnis, dass es möglich ist, nicht nur eine einzelne Drucklackschicht auf ein Trägermaterial aufzubringen, sondern auch für mehrfarbige Laserbeschriftung mehrere Drucklackschichten übereinander, jeweils unabhängig voneinander. Diese Möglichkeit wurde bislang nicht erkannt, da der Auftrag mehrerer Drucklackschichten nicht nur eine präzise Abstimmung des Druckverfahrens hinsichtlich jeder Drucklackschicht erfordert, sondern auch eine wohldefinierte Laserabsorption in jeder der Farbschichten, die über den gesamten Drucklackschichtverbund weitestgehend homogen sein sollte.The teaching of the invention is initially based on the fundamental knowledge that it is possible to apply not only a single printing ink layer on a substrate, but also for multicolor laser marking a plurality of printing ink layers one above the other, each independently. This possibility has hitherto not been recognized, since the application of several pressure varnish layers not only requires a precise matching of the printing process with respect to each printing varnish layer, but also a well-defined laser absorption in each of the color layers, which should be largely homogeneous over the entire printing varnish layer composite.

Als Drucklackschicht wird hier und im Folgenden eine Lackschicht bezeichnet, die aufgedruckt ist, insbesondere mittels eines Flexodruckverfahrens. Darüber hinaus handelt es sich bei einer Drucklackschicht in diesem Sinne um eine Gravurschicht, d.h. in die Drucklackschicht ist zudem mittels Laserbestrahlung eine Kennzeichnung einbringbar, beispielsweise durch lokales Entfernen der Gravurschicht, eine lokale Änderung der optischen Eigenschaften (beispielsweise Reflektion, Transmission, Farbe) oder ähnliches.A lacquer layer is here and hereinafter referred to as the printing lacquer layer which is printed, in particular by means of a flexographic printing process. In addition, a printing ink layer in this sense is an engraving layer, i. In addition, a marking can be introduced into the printing lacquer layer by means of laser irradiation, for example by local removal of the engraving layer, a local change in the optical properties (for example reflection, transmission, color) or the like.

Die Verwendung von Drucklackschichten bietet gegenüber anderen Lackschichten und auch gegenüber Laminatschichten den Vorteil, dass sie relativ dünn aufgetragen werden können. Dies führt zu der Möglichkeit einer schnelleren Laserbeschriftung, da eine dünnere Schicht aufgrund des geringeren Masseabtrags bei der Laserbeschriftung schneller beschriftet werden kann. Insbesondere werden Drucklackschichten nämlich mit einem Masseauftrag von etwa 1 g/m2 bis etwa 3 g/m2 aufgetragen, wohingegen der Masseauftrag von ESH-Acrylatlackschichten üblicherweise mindestens etwa 10 g/m2 beträgt. Des weiteren ermöglichen die Drucklackschichten auf einfache Weise eine flexible/beliebige Farbgebung.The use of pressure-lacquer coatings offers the advantage over other lacquer coatings and also over laminate coatings that they can be applied relatively thinly. This leads to the possibility of faster laser marking, since a thinner layer can be labeled faster due to the lower mass removal during laser marking. In particular, printing lacquer layers are applied with a mass application of about 1 g / m 2 to about 3 g / m 2 , whereas the application of ESH acrylate lacquer layers is usually at least about 10 g / m 2 . Furthermore, the pressure-varnish layers enable a flexible / arbitrary coloring in a simple manner.

Durch den Einsatz mehrerer verschiedenfarbiger Drucklackschichten können sodann mehrfarbige Beschriftungen erzielt werden, indem die Laserbeschriftung derart erfolgt, dass lokal jeweils eine oder mehrere der Drucklackschichten durch Laserbestrahlung entfernt werden, sodass die jeweils darunter liegende Schicht durchscheint. Je nach Farbgestaltung der verschiedenen Drucklackschichten kann somit eine verschiedenfarbige Beschriftung erfolgen. Die Problematik bei der Laserbeschriftung besteht nun aber darin, sicherzustellen, dass das Material eine zielgenaue Laserbeschriftung erlaubt, also dass ein Schichtabtrag jeder einzelnen Schicht zwar vollständig erfolgt, die jeweils darunter liegende Schicht jedoch nicht mit abgetragen wird.By using a plurality of differently colored printing lacquer layers multi-colored inscriptions can then be achieved by the laser inscription takes place in such a way that locally one or more of the printing lacquer layers are removed by laser irradiation, so that the respectively underlying layer shines through. Depending on the color scheme of the different pressure varnish layers can thus be made a different colored lettering. However, the problem with laser inscription now is to ensure that the material allows accurate laser marking, ie that a layer removal of each individual layer is completed, but the underlying layer is not removed.

Um einen möglichst einheitlichen Beschriftungsvorgang für die verschiedenen Drucklackschichten zu ermöglichen, ist erfindungsgemäß vorgesehen, dass der Absorptionskoeffizient der jeweiligen Drucklackschichten zueinander möglichst einheitlich ist. Erfindungsgemäß ist vorgesehen, dass die Absorptionsrate einer jeden Drucklackschicht für übliche Wellenlängen bei der Laserbeschriftung um nicht mehr als 20 %, bevorzugt um nicht mehr als 15%, weiter bevorzugt um nicht mehr als 10 %, von der Absorptionsrate der weiteren Drucklackschichten abweicht. Dieser Referenzwert für den Absorptionskoeffizienten bezieht sich dabei auf die für einen Nd:YAG-Laser typischen Wellenlänge von ca. 1064 nm. Vorliegend kann dies insbesondere durch eine entsprechende Abstimmung des jeweiligen Anteils von Titandioxid und/oder Ruß innerhalb der Drucklackschicht erzielt werden.In order to enable the most uniform possible labeling process for the different pressure-lacquer layers, it is provided according to the invention that the absorption coefficient of the respective pressure-lacquer layers is as uniform as possible with respect to one another. According to the invention, it is provided that the absorption rate of each print varnish layer for conventional wavelengths in laser inscription deviates by not more than 20%, preferably not more than 15%, more preferably not more than 10%, from the absorption rate of the further print varnish layers. In this case, this reference value for the absorption coefficient relates to the wavelength of about 1064 nm typical for a Nd: YAG laser. In the present case, this can be achieved, in particular, by a corresponding adjustment of the respective proportion of titanium dioxide and / or carbon black within the printing ink layer.

Beide Additive zeichnen sich als gute Laserabsorber aus. Zudem zeichnen diese beiden Additive durch eine gute Verträglichkeit mit den anderen Bestandteilen von Drucklacken aus. Durch die Zugabe von Titandioxid und/oder Ruß als Laserabsorbern ist es zudem möglich, einen Drucklack beliebiger Farbe zu verwenden. Das eigentliche farbgebende Pigment des Drucklacks braucht bezüglich der Wechselwirkung mit der Laserstrahlung keine besonderen Absorptionseigenschaften mehr zu erfüllen. Insbesondere kann somit eine laserbeschriftbare Drucklackschicht als gelbe Drucklackschicht ausgebildet werden. Dies war in der Vergangenheit mit anderen Systemen nicht oder nur mit sehr großem Aufwand möglich.Both additives are characterized as good laser absorbers. In addition, these two additives are characterized by a good compatibility with the other components of printing varnishes. By the addition of titanium dioxide and / or carbon black as laser absorbers, it is also possible to use a printing varnish of any color. The actual coloring pigment of the printing varnish no longer needs to fulfill special absorption properties with respect to the interaction with the laser radiation. In particular, a laser-printable printing ink layer can thus be formed as a yellow printing ink layer. In the past, this was not possible with other systems or only with great effort.

In bevorzugter Ausgestaltung werden die Drucklackschichten jeweils unmittelbar übereinander angeordnet, d.h. es sind keine weiteren Zwischenschichten vorgesehen.In a preferred embodiment, the pressure-lacquer layers are each arranged directly above one another, ie no further intermediate layers are provided.

Dies ist insbesondere im Hinblick auf eine möglichst dünne sowie kostengünstige Ausgestaltung der Folie besonders vorteilhaft.This is particularly advantageous in view of the thinnest possible and cost-effective design of the film.

In weiter bevorzugter Ausgestaltung basieren die einzelnen Drucklackschichten auf UV-härtenden Drucklacken. Dies ermöglicht eine besonders einfache und schnelle Trocknung der jeweiligen Drucklackschichten.In a further preferred embodiment, the individual pressure-lacquer layers are based on UV-curing printing lacquers. This allows a particularly simple and fast drying of the respective printing ink layers.

Ferner ist in bevorzugter Ausgestaltung vorgesehen, dass jede Drucklackschicht vor der Bedruckung durch die nächste Drucklackschicht ausgehärtet wird. Dadurch kann sichergestellt werden, dass eine Durchmischung der einzelnen Drucklackschichten und damit eine Durchmischung der jeweiligen Farben vermieden wird. Je nach Ausgestaltung der Drucklackschicht kann die Aushärtung beispielsweise durch UV-Bestrahlung, Elektronenstrahlhärtung, thermische Behandlung oder dergleichen erfolgen.Furthermore, it is provided in a preferred embodiment that each printing ink layer is cured before printing by the next printing ink layer. This can ensure that a thorough mixing of the individual printing ink layers and thus mixing of the respective colors is avoided. Depending on the configuration of the pressure-varnish layer, the curing can take place, for example, by UV irradiation, electron-beam curing, thermal treatment or the like.

In einer Ausgestaltung des Herstellungsverfahrens handelt es sich bei dem Träger, auf den die Drucklackschichten aufgebracht werden, um einen Prozessträger, der nach dem Aufbringen und Aushärten der Drucklackschichten wieder entfernt wird. Dies ist insbesondere dann vorteilhaft, wenn die aus den Drucklackschichten gebildete Folie selbsttragend ausgebildet wird, also ein zusätzlicher Träger nicht vorgesehen ist. Alternativ oder ergänzend kann aber auch ein zusätzlicher permanenter Träger vorgesehen werden. Wenn die zunächst beispielsweise aus Produktionsgründen vorgesehene Schichtabfolge im Endprodukt in umgekehrter Reihenfolge vorliegen soll, so wird der permanente Träger nach dem Aushärten der Drucklackschichten auf diese aufkaschiert und der Prozessträger anschließend entfernt werden.In one embodiment of the production method, the carrier to which the print varnish layers are applied is a process carrier which is removed again after the application and hardening of the print varnish layers. This is particularly advantageous if the film formed from the pressure varnish layers is formed self-supporting, so an additional support is not provided. Alternatively or additionally, however, an additional permanent carrier can also be provided. If the layer sequence initially provided, for example, for production reasons, should be present in the end product in reverse order, then the permanent support is laminated onto the pressure-lacquer layers after curing and the process carrier is subsequently removed.

Die einzelnen Drucklackschichten können jeweils vollflächig oder auch nur partiell, beispielsweise in Form eines Logos oder dergleichen aufgebracht sein.The individual pressure-lacquer layers can each be applied over the entire surface or even only partially, for example in the form of a logo or the like.

Als besonders vorteilhaft hat sich für das Additiv Titandioxid ein Anteil von mindestens 5%, vorzugsweise von mindestens 10 % herausgestellt. Hinsichtlich des Ruß haben sich Anteile von mindestens 2 %, vorzugsweise von mindestens 4 als optimal herausgestellt.Particularly advantageous for the additive titanium dioxide, a proportion of at least 5%, preferably at least 10% has been found. With regard to the carbon black, proportions of at least 2%, preferably at least 4, have been found to be optimal.

Ferner wird die Drucklackschicht möglichst frei von Dickeschwankungen ausgebildet. Innerhalb einer jeden Drucklackschicht weicht die Schichtdicke um nicht mehr als 10% von der mittleren Schichtdicke ab. Eine derartige Schichtdickenqualität ist besonders gut durch das Aufdrucken der Drucklackschichten erzielbar, insbesondere beim Flexodruckverfahren.Furthermore, the printing ink layer is formed as free as possible from thickness fluctuations. Within each printing ink layer, the layer thickness does not differ by more than 10% from the average layer thickness. Such a layer thickness quality is special good by the printing of the printing ink layers achievable, especially in the flexographic printing process.

Um einerseits einen ausreichenden Farbkontrast zu erzielen und andererseits eine möglichst hohe Beschriftungseffizienz zu ermöglichen, weist die Drucklackschicht eine Schichtdicke zwischen 1 µm und 10 µm, vorzugsweise zwischen etwa 1 µm und etwa 5 µm auf.On the one hand to achieve a sufficient color contrast and on the other hand to allow the highest possible labeling efficiency, the printing ink layer has a layer thickness between 1 .mu.m and 10 .mu.m, preferably between about 1 .mu.m and about 5 .mu.m.

Die Schichtdicke des Trägers beträgt vorzugsweise zwischen etwa 50 µm und etwa 200 µm. Als Träger kommen grundsätzlich alle Folien und Folienverbundsysteme in Frage. Insbesondere eignen sich beispielsweise Polymerfolien wie Polyethylenfolie, PVC-Folie oder dergleichen. Hinsichtlich des Trägers sollte lediglich eine gute Haftung der Drucklackschicht auf diesem gewährleistet sein. Gegebenenfalls kann dies durch das Aufbringen eines zusätzlichen Haftvermittlers erfolgen, wie es aus dem Stand der Technik bekannt ist.The layer thickness of the carrier is preferably between about 50 microns and about 200 microns. In principle, all films and composite film systems come into question as carriers. In particular, for example, polymer films such as polyethylene film, PVC film or the like are suitable. With regard to the carrier, only a good adhesion of the printing ink layer should be ensured on this. Optionally, this can be done by applying an additional primer, as is known in the art.

In besonders bevorzugter Ausgestaltung wird die laserbeschriftbare Folie als Klebefolie, insbesondere als selbstklebende Klebefolie ausgebildet, indem eine Klebeschicht aufgebracht wird. Die Klebeschicht kann auf beliebigen Klebmassen basieren, wie sie aus dem Stand der Technik bekannt sind, insbesondere auf so genannten Haftklebmassen. Sofern die laserbeschriftbare Folie einen permanenten Träger aufweist, so wird die Klebeschicht aus Gründen einer einfachen Herstellung bevorzugt auf der den Drucklackschichten gegenüber liegenden Seite des Trägers aufgebracht. Alternativ kann die Klebeschicht aber auch auf der obersten Lackschicht aufgebracht werden. In diesem Fall sollte der Träger jedoch ebenfalls laserbeschriftbar ausgebildet sein, damit die Beschriftung durch den Träger hindurch erfolgen kann. Diese Anordnung hat den Vorteil, dass ein Ablösen der Folie nach dem Verkleben ohne einen Bruch der Lackschichten und damit einer dort eingeschriebenen Kennung nicht möglich ist. Die Drucklackschichten selbst können nämlich sehr brüchig eingestellt werden und können damit ohne Hilfe eines Trägers nach einer Verklebung nicht beschädigungsfrei abgelöst werden. Da der Träger aber oberhalb der Lackschichten angeordnet ist, werden die Drucklackschichten bei einem Manipulationsversuch beschädigt.In a particularly preferred embodiment, the laser-writable film is formed as an adhesive film, in particular as a self-adhesive film, by applying an adhesive layer. The adhesive layer may be based on any adhesives known from the prior art, in particular on so-called pressure-sensitive adhesives. If the laser-inscribable film has a permanent carrier, the adhesive layer is preferably applied to the side of the carrier opposite the printing-lacquer layers for reasons of simple production. Alternatively, the adhesive layer can also be applied to the uppermost lacquer layer. In this case, however, the carrier should also be laser-inscribable so that the inscription can be made through the carrier. This arrangement has the advantage that a detachment of the film after bonding without a break of the paint layers and thus an inscribed there identifier is not possible. The pressure varnish layers themselves can in fact be set very brittle and thus can not be detached without damage without the help of a carrier after bonding. However, since the carrier is arranged above the lacquer layers, the print lacquer layers are damaged during a manipulation attempt.

Der zuvor beschriebene Verbund der Drucklackschichten ist bevorzugt nicht nur laserbeschriftbar, sondern zudem auch laserschneidbar, d.h. durch Lasereinstrahlung kann eine Durchtrennung aller Schichten erfolgen. Um die Herstellung von beschrifteten Etiketten möglichst einfach zu gestalten, sollte zudem auch der Träger mittels Laser schneidbar ausgebildet sein. Dadurch wird es dem Abnehmer der laserbeschriftbaren Folien möglich, diese individuell zu beschriften und gleichzeitig aus der Folie ein Etikett mit den gewünschten Abmessungen herauszuschneiden. Ein so gebildetes laserbeschriftetes Etikett weist insbesondere eine mehrfarbige individualisierte Kennzeichnung auf, wie zum Beispiel eine Seriennummer, einen Barcode oder dergleichen. Das Laserschneiden des Etiketts ermöglicht zudem die Anpassung der Form in gewünschter Weise. So kann das Etikett auch eine individualisierte Form aufweisen, beispielsweise mit der äußeren Gestalt einer alphanumerischen Kennung, einer oder mehreren voneinander beabstandeten Ausnehmungen am Etikettenrand oder dergleichen.The composite of the printing lacquer layers described above is preferably not only laser-inscribable, but also laser-cut, ie by laser irradiation a separation of all layers can take place. To make the production of labeled labels as simple as possible, also the carrier should be formed by laser cutting. This makes it possible for the customer of the laser-writable films to label them individually and at the same time to cut out of the film a label with the desired dimensions. A laser-printed label formed in this way has in particular a multicolored individualized identification, such as a serial number, a barcode or the like. The laser cutting of the label also allows the adaptation of the shape in the desired manner. Thus, the label may also have an individualized shape, for example with the outer shape of an alphanumeric identifier, one or more spaced-apart recesses on the label edge or the like.

Besonders bevorzugt ist in diesem Fall eine Korrelation zwischen der individualisierten mehrfarbigen Kennzeichnung des Etiketts und der individualisierten Form. Diese Korrelation kann beispielsweise darin bestehen, dass sich die Kennzeichnung ganz oder teilweise in der Form widerspiegelt oder, dass die Kennzeichnung und die individualisierte Form nur gemeinsam die vollständige Information wiedergeben.Particularly preferred in this case is a correlation between the individualized multi-colored marking of the label and the individualized form. This correlation can consist, for example, in the fact that the marking is completely or partially reflected in the form or that the marking and the individualized form only reproduce the complete information together.

Weitere Einzelheiten, Merkmale, Ziele und Vorteile der vorliegenden Erfindung werden nachfolgend anhand einer Zeichnung bevorzugter Ausführungsbeispiele näher erläutert. In der Zeichnung zeigt:

Fig. 1
eine schematische Darstellung des Schichtaufbaus einer laserbeschriftbaren Folie gemäß einer ersten Ausgestaltung,
Fig. 2
eine schematische Darstellung des Schichtaufbaus eines laserbeschriftbaren Etiketts gemäß einer weiteren Ausgestaltung,
Fig. 3
das Etikett aus Fig. 2 in Draufsicht.
Further details, features, objects and advantages of the present invention will be explained in more detail with reference to a drawing of preferred embodiments. In the drawing shows:
Fig. 1
a schematic representation of the layer structure of a laser-writable film according to a first embodiment,
Fig. 2
a schematic representation of the layer structure of a laser-writable label according to a further embodiment,
Fig. 3
the label off Fig. 2 in plan view.

Fig. 1 zeigt eine laserbeschriftbare Folie 1 mit einem Träger 2, einer ersten Lackschicht 3 sowie einer weiteren Lackschicht 4. Der Träger 2 ist hier als permanenter Träger der Folie 1 vorgesehen und wird aus einer etwa 100 µm dicken Folie aus Polyethylen gebildet. Zwingend ist ein solcher zusätzlicher Träger jedoch nicht erforderlich. Je nach Ausgestaltung können vielmehr auch die Lackschichten 3, 4 oder andere Schichten dessen Funktion übernehmen. Die beiden Lackschichten 3, 4 sind vollflächig ausgebildet. Sie sind jeweils aus einem Drucklack ausgebildet, vorliegend nämlich einem UV-härtbaren Drucklack. Fig. 1 shows a laser-writable film 1 with a support 2, a first lacquer layer 3 and a further lacquer layer 4. The support 2 is provided here as a permanent support of the film 1 and is made of an approximately 100 micron thick film of polyethylene educated. However, such an additional carrier is not required. Depending on the configuration, the lacquer layers 3, 4 or other layers can rather take over their function. The two paint layers 3, 4 are formed over the entire surface. They are each formed from a pressure varnish, in the present case a UV-curable printing varnish.

Zur Herstellung der Folie 1 wurde zunächst der Drucklack für die Lackschicht 3 auf den Träger 2 im Flexodruckverfahren aufgedruckt. Die Schichtdicke betrug etwa 3 µm. Anschließend wurde die Drucklackschicht 3 mittels UV-Strahlung ausgehärtet. Nach dem Aushärten wurde der Drucklack für die Drucklackschicht 4 auf die ausgehärtete Drucklackschicht 3 im Flexodruckverfahren aufgedruckt, mit einer Schichtdicke von etwa 4 µm. Auch die Drucklackschicht 4 wurde mittels UV-Strahlung ausgehärtet.To produce the film 1, first the printing varnish for the varnish layer 3 was printed on the substrate 2 in the flexographic printing process. The layer thickness was about 3 microns. Subsequently, the printing lacquer layer 3 was cured by means of UV radiation. After curing, the printing varnish for the printing varnish layer 4 was printed on the cured printing varnish layer 3 in a flexographic printing process, with a layer thickness of about 4 μm. The printing lacquer layer 4 was cured by means of UV radiation.

Der Träger 2 ist weiß ausgebildet, wohingegen die Drucklackschicht 3 rot und die Drucklackschicht 4 gelb ausgebildet ist. Die Farbgebung der Drucklackschichten erfolgt durch Farbpigmente in den Drucklacken.The carrier 2 is formed white, whereas the printing ink layer 3 is red and the printing ink layer 4 is formed yellow. The coloring of the printing lacquer layers takes place by way of color pigments in the printing lacquers.

Die Drucklacke der Drucklackschichten 3, 4 weisen neben den dem Fachmann bekannten Farbpigmenten für rot und gelb außerdem Titandioxid bzw. Ruß als Laserabsorber auf. Durch diese Bestandteile eignen sich die Drucklackschichten 3, 4 besonders gut als Gravurschichten, sie sind also durch Laserbestrahlung lokal beschriftbar. Bei der Beschriftung wird die Laserstrahlung lokal absorbiert und zunächst die obere Drucklackschicht 4 partiell entfernt. Anschließend oder während des gleichen Beschriftungsdurchgangs kann auch noch die darunter liegende Drucklackschicht 3 durch Laserbestrahlung entfernt werden. Inwiefern eine oder mehrere Drucklackschichten 3, 4 in einem Durchgang oder nacheinander entfernt werden, kann durch geeignete Wahl der Laserparameter (Pulsdauer, Intensität) gesteuert werden. Vorliegend ist somit eine Beschriftung in den Farben gelb, rot und weiß möglich.In addition to the color pigments for red and yellow known to the person skilled in the art, the printing varnishes of the printing varnish layers 3, 4 additionally comprise titanium dioxide or carbon black as laser absorber. By means of these constituents, the printing lacquer layers 3, 4 are particularly suitable as gravure layers, so they can be labeled locally by laser irradiation. When labeling the laser radiation is absorbed locally and initially the upper printing lacquer layer 4 partially removed. Subsequently or during the same inscription passage, the underlying printing lacquer layer 3 can also be removed by laser irradiation. The extent to which one or more printing lacquer layers 3, 4 are removed in one pass or in succession can be controlled by a suitable choice of the laser parameters (pulse duration, intensity). In the present case a lettering in the colors yellow, red and white is possible.

Die Drucklackschicht 3 weist vorliegend einen Anteil von 10 % Titandioxid und einen Anteil von 0,1 % Ruß auf. Die Drucklackschicht 4 hingegen weist einen Anteil von 15 % Titandioxid und einen Anteil von 0,1 % Ruß auf. In beiden Fällen dient die Beimischung von Ruß ausschließlich der Farbgestaltung und nicht der Laserabsorption, die vollständig durch die hinreichende Beimischung von Titandioxid geleistet wird.In the present case, the printing lacquer layer 3 has a proportion of 10% titanium dioxide and a proportion of 0.1% carbon black. The printing ink layer 4, however, has a proportion of 15% titanium dioxide and a proportion of 0.1% carbon black. In both cases, the admixture of carbon black is solely the color design and not the laser absorption, which is completely done by the sufficient admixture of titanium dioxide.

Durch eine gleichmäßiges Einmischen der Absorber in den jeweiligen Drucklack ist der Absorptionskoeffizient innerhalb einer Drucklackschicht sehr homogen ausgebildet. Durch die individuelle Einmischung der Laserabsorber in den Drucklack kann in Abhängigkeit von der vorgesehen Schichtdicke und den weiteren Bestandteilen des Drucklacks (farbgebende Pigmente, Bindemittel etc.) zudem vorgesehen werden, dass sich die Absorptionsraten der einzelnen Drucklackschichten 3, 4 nicht wesentlich voneinander unterscheiden. Vorliegend ist die Absorptionsrate der Drucklackschicht 3 um etwa 14 % niedriger als die Absorptionsrate der Drucklackschicht 4. Für einen möglichst einfachen Beschriftungsprozess sollten die Absorptionsraten um nicht mehr als 20 % voneinander abweichen.By uniform mixing of the absorber in the respective printing lacquer, the absorption coefficient is formed very homogeneously within a printing lacquer layer. As a result of the individual mixing of the laser absorbers into the printing lacquer, depending on the intended layer thickness and the further constituents of the printing lacquer (coloring pigments, binders, etc.), it may additionally be provided that the absorption rates of the individual printing lacquer layers 3, 4 do not differ significantly from one another. In the present case, the absorption rate of the printing lacquer layer 3 is about 14% lower than the absorption rate of the printing lacquer layer 4. For the simplest possible labeling process, the absorption rates should not differ by more than 20% from one another.

Fig. 2 zeigt eine alternative Ausgestaltung einer laserbeschriftbaren Folie 1 in Form eines Etiketts. Dieses Etikett 1 weist wiederum einen Träger 2 auf, auf dem zwei Lackschichten 3, 4 angeordnet sind. Im Gegensatz zu der vorherigen Ausgestaltung ist die Lackschicht 3 nicht vollflächig sondern nur partiell, insbesondere in Form eines Logos, ausgebildet. Die Drucklackschicht 4 hingegen ist vollflächig ausgebildet, überdeckt also die Drucklackschicht 3 sowie den Träger 2. Fig. 2 shows an alternative embodiment of a laser-writable film 1 in the form of a label. This label 1 in turn has a carrier 2, on which two paint layers 3, 4 are arranged. In contrast to the previous embodiment, the lacquer layer 3 is not the entire surface but only partially, in particular in the form of a logo formed. The pressure varnish layer 4, however, is formed over the entire surface, thus covering the printing varnish layer 3 and the support 2.

Auch bei dieser Ausgestaltung weisen beide Drucklackschichten 3, 4 jeweils Titandioxid und Ruß als Laserabsorber auf, so dass die beiden Drucklackschichten 3, 4 wieder als Gravurschichten ausgebildet sind. Eine farbige Beschriftung ist somit wiederum durch lokalen Abtrag einer oder beider Drucklackschichten 3, 4 möglich. Sofern die Drucklackschicht 4 zudem nicht deckend ausgebildet ist, scheint auch unabhängig von der Laserbeschriftung die Drucklackschicht in Gestalt des Logos durch. Ebenso kann z.B. durch Beimischung von UV-fluoreszierenden Pigmenten ein weiteres Merkmal eingebracht werden. Da das Merkmal unterhalb der Oberfläche eingebracht ist, kann es insbesondere nicht mit dem bloßem Auge erkannt werden.Also in this embodiment, both printing lacquer layers 3, 4 each have titanium dioxide and carbon black as laser absorber, so that the two printing lacquer layers 3, 4 are again formed as engraving layers. A colored inscription is thus possible in turn by local removal of one or both printing lacquer layers 3, 4. If the pressure-lacquer layer 4 is also not opaque, the pressure-lacquer layer in the form of the logo also appears independent of the laser inscription. Likewise, e.g. By adding UV-fluorescent pigments another feature can be introduced. In particular, since the feature is placed beneath the surface, it can not be detected by the naked eye.

Das Etikett 1 weist zusätzlich unterhalb des Trägers 2 eine Klebeschicht 5 auf. Die Klebeschicht 5 basiert vorliegend auf einer Haftklebemasse und weist eine Schichtdicke von etwa 30 µm auf. Mittels dieser Klebeschicht 5 ist das Etikett 1 auf beliebigen Untergründen festlegbar.The label 1 additionally has an adhesive layer 5 below the carrier 2. The adhesive layer 5 is based here on a pressure-sensitive adhesive and has a layer thickness of about 30 microns. By means of this adhesive layer 5, the label 1 can be fixed on any surface.

Das Etikett 1 ist zudem derart ausgebildet, dass es mittels eines Lasers, insbesondere mittels desselben Lasers, der auch zur Laserbeschriftung verwendet wird, geschnitten werden kann.The label 1 is also designed such that it can be cut by means of a laser, in particular by means of the same laser, which is also used for laser marking.

Fig. 3 zeigt das Etikett 1 in Draufsicht. Dabei ist zu erkennen, dass die äußere Form des Etiketts 1 individualisiert ist, hier nämlich den Umriss der letzten Ziffer einer Ziffernfolge wieder gibt. Diese Formgebung wurde individuell zusammen mit dem Einschreiben einer mehrfarbigen Kennzeichnung 6 realisiert. Die Kennzeichnung 6 sowie die individualisierte Form sind dabei miteinander korreliert, weisen vorliegend nämlich eine übereinstimmende letzte Ziffern auf. Fig. 3 shows the label 1 in plan view. It can be seen that the outer shape of the label 1 is individualized, here namely the outline of the last digit of a digit sequence is again. This shaping was realized individually together with the writing of a multi-colored marking 6. The identification 6 and the individualized form are correlated with each other, in the present case namely have a matching last digits.

Alternativ kann die individualisierte Form auch auf anderen Kennzeichnungsarten basieren, beispielsweise auf einer oder mehreren Einkerbungen mit gleicher und/oder unterschiedlicher Breite analog einem Barcode oder ähnlichem. Die Korrelation kann zudem darin bestehen, dass Information teilweise oder vollständig ggf. verschlüsselt wiederholt wird. Alternativ kann die Korrelation auch darin bestehen, dass sich die beiden Informationen gemeinsam erst zu einer vollständigen Information ergänzen.Alternatively, the individualized form can also be based on other types of identifications, for example on one or more indentations with the same and / or different width analogous to a barcode or the like. The correlation can also be that information is partially or completely repeated, if necessary, in encrypted form. Alternatively, the correlation may consist in the fact that the two pieces of information complement each other only to a complete information.

Im Folgenden werden bevorzugte Ausführungsformen der Erfindung wiedergegeben:

  1. 1. Mehrfarbig laserbeschriftbare Folie (1), mit einem Träger (2), einer ersten Lackschicht (3) und mindestens einer weiteren Lackschicht (4) oberhalb der ersten Lackschicht (3),
    wobei sich die Farbe zweier jeweils übereinander angeordneter Lackschichten (3, 4) voneinander unterscheidet,
    dadurch gekennzeichnet,
    dass die erste (3) und die weiteren Lackschichten (4) jeweils aus einem Drucklack ausgebildet sind,
    dass die Drucklackschichten (3, 4) eine um nicht mehr als 20 % voneinander abweichende Absorptionsrate (bezogen auf die Wellenlänge von 1064 nm eines Nd:YAG-Lasers) aufweisen,
    dass innerhalb einer jeden Drucklackschicht (3, 4) die Schichtdicke um nicht mehr als 10% von der mittleren Schichtdicke abweicht,
    dass die Drucklackschichten (3, 4) eine Schichtdicke zwischen 1 µm und 10 µm aufweisen und
    dass die Lackschichten (3, 4) aufgedruckt sind.
  2. 2. Mehrfarbig laserbeschriftbare Folie (1) nach Anspruch 1, dadurch gekennzeichnet,
    dass die Drucklackschichten (3, 4) unmittelbar übereinander angeordnet sind.
  3. 3. Mehrfarbig laserbeschriftbare Folie (1) nach Anspruch 1 oder 2, dadurch gekennzeichnet,
    dass die Drucklackschichten (3, 4) aus UV-härtenden Drucklacken ausgebildet sind.
  4. 4. Mehrfarbig laserbeschriftbare Folie (1) nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet,
    dass mindestens eine Drucklackschicht (3, 4), insbesondere die erste (3) oder die letzte (4) Drucklackschicht, vollflächig und die weiteren Drucklackschichten partiell und/oder vollflächig ausgebildet sind.
  5. 5. Mehrfarbig laserbeschriftbare Folie (1) nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet,
    dass die Drucklackschichten (3, 4) Titandioxid und/oder Ruß als Laserabsorber aufweisen.
  6. 6. Mehrfarbig laserbeschriftbare Folie (1) nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet,
    dass jede Drucklackschicht ( 3, 4) einen Anteil von mindestens 5 %, vorzugsweise von mindestens 10 %, Titandioxid enthält.
  7. 7. Mehrfarbig laserbeschriftbare Folie (1) nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet,
    dass jede Drucklackschicht (3, 4) einen Anteil von mindestens 2 %, vorzugsweise von mindestens 4 %, Ruß enthält.
  8. 8. Mehrfarbig laserbeschriftbare Folie (1) nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet,
    dass die Drucklackschichten (3, 4) eine Dicke zwischen 1 µm und 5 µm aufweisen.
  9. 9. Mehrfarbig laserbeschriftbare Folie (1) nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet,
    dass der Träger (2) und/oder der Permanentträger eine Schichtdicke zwischen 50 µm und 200 µm aufweist.
  10. 10. Mehrfarbig laserbeschriftbare Folie (1) nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet,
    dass eine Klebeschicht (5), insbesondere auf der den Drucklackschichten (3, 4) gegenüber liegenden Seite des Trägers (2), vorgesehen ist.
  11. 11. Mehrfarbig laserbeschriftbare Folie (1) nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet,
    dass die Folie (1) laserschneidbar ausgebildet ist.
  12. 12. Laserbeschriftetes Etikett, aus einer mehrfarbig laserbeschriftbaren Folie (1) gemäß einem der Ansprüche 1 bis 11, dadurch gekennzeichnet,
    dass das Etikett lasergeschnitten ist und eine individualisierte mehrfarbige Kennzeichnung aufweist.
  13. 13. Laserbeschriftetes Etikett nach Anspruch 12, dadurch gekennzeichnet,
    dass das Etikett eine individualisierte Form aufweist.
  14. 14. Laserbeschriftetes Etikett nach Anspruch 13, dadurch gekennzeichnet,
    dass die individualisierte Form und die individualisierte Kennzeichnung miteinander korreliert sind.
  15. 15. Verfahren zur Herstellung einer mehrfarbig laserbeschriftbaren Folie (1) nach einem der Ansprüche 1 bis 11, bei dem die erste Lackschicht (3) auf den Träger (2) aufgebracht wird und bei dem die mindestens eine weitere Lackschicht (4) auf die erste Lackschicht (3) aufgebracht wird,
    dadurch gekennzeichnet,
    dass die Drucklacke zur Ausbildung der Lackschichten (3, 4) aufgedruckt werden.
  16. 16. Verfahren nach Anspruch 15, dadurch gekennzeichnet,
    dass jede Drucklackschicht (3, 4) vor Bedruckung durch die nächste Drucklackschicht ausgehärtet wird.
  17. 17. Verfahren nach einem der Ansprüche 15 oder 16, dadurch gekennzeichnet, dass eine weitere Schicht, insbesondere eine transparente Schutzschicht oder ein zweiter Träger - Permanentträger -, auf die oberste Drucklackschicht (4) aufgebracht wird.
In the following, preferred embodiments of the invention are shown:
  1. 1. multicolor laser-inscribable film (1), with a carrier (2), a first lacquer layer (3) and at least one further lacquer layer (4) above the first lacquer layer (3),
    wherein the color of two coating layers (3, 4) arranged one above the other differs from one another,
    characterized,
    the first (3) and the further lacquer layers (4) are each formed from a printing lacquer,
    the pressure-varnish layers (3, 4) have an absorption rate which differs by not more than 20% (based on the wavelength of 1064 nm of an Nd: YAG laser),
    in that within each printing lacquer layer (3, 4) the layer thickness deviates by not more than 10% from the mean layer thickness,
    that the pressure-varnish layers (3, 4) have a layer thickness between 1 μm and 10 μm, and
    that the lacquer layers (3, 4) are printed.
  2. 2. Multi-color laser-inscribable film (1) according to claim 1, characterized in that
    the printing lacquer layers (3, 4) are arranged directly above one another.
  3. 3. Multi-color laser-inscribable film (1) according to claim 1 or 2, characterized
    the printing lacquer layers (3, 4) are formed from UV-curing printing lacquers.
  4. 4. Multi-color laser-inscribable film (1) according to one of claims 1 to 3, characterized
    in that at least one printing lacquer layer (3, 4), in particular the first (3) or the last (4) printing lacquer layer, is formed over the entire surface and the further pressure lacquer layers are formed partially and / or over the entire surface.
  5. 5. Multi-color laser-inscribable film (1) according to one of claims 1 to 4, characterized
    the pressure-varnish layers (3, 4) comprise titanium dioxide and / or carbon black as laser absorber.
  6. 6. Multi-color laser-inscribable film (1) according to one of claims 1 to 5, characterized
    each printing ink layer (3, 4) contains at least 5%, preferably at least 10%, titanium dioxide.
  7. 7. Multicolor laser-inscribable film (1) according to one of claims 1 to 6, characterized
    each printing lacquer layer (3, 4) contains at least 2%, preferably at least 4%, carbon black.
  8. 8. Multicolor laser-inscribable film (1) according to one of claims 1 to 7, characterized
    the pressure-varnish layers (3, 4) have a thickness between 1 μm and 5 μm.
  9. 9. Multicolor laser-inscribable film (1) according to one of claims 1 to 8, characterized
    the carrier (2) and / or the permanent carrier has a layer thickness between 50 μm and 200 μm.
  10. 10. Multi-color laser-inscribable film (1) according to one of claims 1 to 9, characterized
    an adhesive layer (5) is provided, in particular on the side of the carrier (2) lying opposite the pressure-varnish layers (3, 4).
  11. 11. Multi-color laser-inscribable film (1) according to one of claims 1 to 10, characterized
    the film (1) is laser-cutable.
  12. 12. Laser-inscribed label, from a multi-color laser-inscribable film (1) according to one of claims 1 to 11, characterized
    that the label is laser-cut and has an individualized multi-colored marking.
  13. 13. Laser-inscribed label according to claim 12, characterized
    that the label has an individualized shape.
  14. 14. Laser-inscribed label according to claim 13, characterized
    that the individualized form and the individualized labeling are correlated with each other.
  15. 15. A process for producing a multi-color laser-inscribable film (1) according to one of claims 1 to 11, wherein the first lacquer layer (3) is applied to the carrier (2) and wherein the at least one further lacquer layer (4) on the first Lacquer layer (3) is applied,
    characterized,
    the printing lacquers are printed to form the lacquer layers (3, 4).
  16. 16. The method according to claim 15, characterized
    that each printing ink layer (3, 4) is cured before being printed by the next printing ink layer.
  17. 17. The method according to any one of claims 15 or 16, characterized in that a further layer, in particular a transparent protective layer or a second carrier - permanent carrier -, is applied to the uppermost printing lacquer layer (4).

Claims (17)

  1. Multi-colored laser-inscribable film (1), having a carrier (2), a first lacquer layer (3) and at least one further lacquer layer (4) above the first lacquer layer (3),
    wherein the colors of two lacquer layers (3,4) respectively arranged above one another differ from one another,
    having the features
    that the first (3) and the further lacquer layers (4) are respectively formed from a printing lacquer,
    that the printing lacquer layers (3,4) have absorption rates differing from one another by no more than 20% (based on the wavelength of 1064 nm of an Nd:YAG laser),
    that, within each printing lacquer layer (3,4), the layer thickness differs by no more than 10% from the average layer thickness, that the printing lacquer layers (3,4) have a layer thickness of between 1 µm and 10 µm and that the lacquer layers (3,4) are printed on.
  2. Multi-colored laser-inscribable film (1) according to Claim 1, characterized in that the printing lacquer layers (3,4) are arranged directly on one another.
  3. Multi-colored laser-inscribable film (1) according to Claim 1 or 2, characterized in that the printing lacquer layers (3,4) are formed from UV-curing printing lacquers.
  4. Multi-colored laser-inscribable film (1) according to one of Claims 1 to 3, characterized in that
    at least one printing lacquer layer (3,4), in particular the first (3) or last (4) printing lacquer layer, is formed surface-wide, and the further printing lacquer layers are formed partially and/or surface-wide.
  5. Multi-colored laser-inscribable film (1) according to one of Claims 1 to 4, characterized in that
    the printing lacquer layers (3,4) comprise titanium dioxide and/or carbon black as a laser absorber.
  6. Multi-colored laser-inscribable film (1) according to one of Claims 1 to 5, characterized in that
    each printing lacquer layer (3,4) contains a proportion of at least 5%, preferably at least 10%, of titanium dioxide.
  7. Multi-colored laser-inscribable film (1) according to one of Claims 1 to 6, characterized in that
    each printing lacquer layer (3,4) contains a proportion of at least 2%, preferably at least 4%, of carbon black.
  8. Multi-colored laser-inscribable film (1) according to one of Claims 1 to 7, characterized in that
    the printing lacquer layers (3,4) have a thickness of between 1 µm and 5 µm.
  9. Multi-colored laser-inscribable film (1) according to one of Claims 1 to 8, characterized in that
    the carrier (2) and/or the permanent carrier have a layer thickness of between 50 µm and 200 µm.
  10. Multi-colored laser-inscribable film (1) according to one of Claims 1 to 9, characterized in that
    an adhesive layer (5) is provided, in particular on the opposite side of the carrier (2) from the printing lacquer layers (3,4).
  11. Multi-colored laser-inscribable film (1) according to one of Claims 1 to 10, characterized in that
    the film (1) is configured to be laser-cuttable.
  12. Laser-inscribed label, made of a multi-colored laser-inscribable film (1) according to one of Claims 1 to 11, characterized in that
    the label is laser-cut and has an individualized multi-colored identifier.
  13. Laser-inscribed label according to Claim 12, characterized in that
    the label has an individualized shape.
  14. Laser-inscribed label according to Claim 13, characterized in that
    the individualized shape and the individualized identifier are correlated with one another.
  15. Method for producing a multi-colored laser-inscribable film (1) according to one of Claims 1 to 11, in which the first lacquer layer (3) is applied onto the carrier (2) and in which the at least one further lacquer layer (4) is applied onto the first lacquer layer (3),
    characterized in that
    the printing lacquers are printed on in order to form the lacquer layers (3,4).
  16. Method according to Claim 15, characterized in that
    each printing lacquer layer (3,4) is cured before printing with the next printing lacquer layer.
  17. Method according to either of Claims 15 and 16, characterized in that
    a further layer, in particular a transparent protective layer or a second carrier - permanent carrier - is applied onto the top printing lacquer layer (4).
EP09782323A 2008-09-09 2009-08-28 Method for producing a multi-coloured laser-inscribable film Not-in-force EP2276637B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008046461A DE102008046461A1 (en) 2008-09-09 2008-09-09 Process for producing a multicolor laser-inscribable film
PCT/EP2009/061124 WO2010028962A1 (en) 2008-09-09 2009-08-28 Method for producing a multi-coloured laser-inscribable film

Publications (2)

Publication Number Publication Date
EP2276637A1 EP2276637A1 (en) 2011-01-26
EP2276637B1 true EP2276637B1 (en) 2013-01-09

Family

ID=41277425

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09782323A Not-in-force EP2276637B1 (en) 2008-09-09 2009-08-28 Method for producing a multi-coloured laser-inscribable film

Country Status (5)

Country Link
US (1) US20110206916A1 (en)
EP (1) EP2276637B1 (en)
JP (1) JP2012501874A (en)
DE (1) DE102008046461A1 (en)
WO (1) WO2010028962A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019116103B4 (en) * 2019-06-13 2021-04-22 Notion Systems GmbH Method for labeling a printed circuit board by creating shading in a functional lacquer layer

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01267092A (en) * 1988-04-19 1989-10-24 Miyachi Electric Co Laser marking method
EP0645747A3 (en) * 1993-09-27 1997-01-08 Gerecke & Lauer Gmbh Fa Laser writable label.
JP3766468B2 (en) 1996-04-18 2006-04-12 麒麟麦酒株式会社 Laser printing media
US6169266B1 (en) * 1998-03-25 2001-01-02 Xirom, Inc. Etching of multi-layered coated surfaces to add graphic and text elements to an article
DE10048665B4 (en) 2000-09-30 2019-06-13 Tesa Se Method for producing a label with increased security against counterfeiting
DE10142638A1 (en) 2001-08-31 2003-05-08 Tesa Ag Process for producing a laser-inscribable film
GB0226597D0 (en) 2002-11-14 2002-12-24 Sun Chemical Bv Laser marking process
CA2507131C (en) * 2002-11-26 2011-11-08 Fuji Oil Co., Ltd. .beta.-1,4-mannobiose-containing composition
DE10326501B4 (en) * 2003-06-10 2007-04-26 Bischoff Gmbh Laser-markable multilayer label material
DE10343704A1 (en) 2003-09-18 2005-04-14 Mankiewicz Gebr. & Co (Gmbh & Co Kg) Pigment for laser-engravable paints
DE102004057918A1 (en) * 2004-11-30 2006-06-01 Merck Patent Gmbh Laser marking of value documents
DE202006013892U1 (en) * 2006-09-05 2008-01-10 Herma Gmbh bonding
DE102007034636A1 (en) * 2007-07-23 2007-11-29 Tesa Ag Laser sensitive label for use in automobile industry, has carrier layer with additives that exhibits color change under laser irradiation, where layer is coated with self adhesive mass on one side, and is covered with separation paper

Also Published As

Publication number Publication date
EP2276637A1 (en) 2011-01-26
WO2010028962A1 (en) 2010-03-18
DE102008046461A1 (en) 2010-03-11
JP2012501874A (en) 2012-01-26
US20110206916A1 (en) 2011-08-25

Similar Documents

Publication Publication Date Title
EP1440133B1 (en) Method for producing a laser-printable film
EP2938496B1 (en) Method and device for cold stamping on three-dimensional articles
EP0866750A1 (en) Foil capable of being inscribed by a laser beam
DE102007055356A1 (en) Laser inscribable foil
EP2276629B1 (en) Method for producing a multi-layered film
EP2717243B1 (en) Sealing label and a method for the production thereof
DE10006377A1 (en) Label which is inscribed with a laser beam, comprises macroscopic and microscopic inscription, and the latter is difficult to counterfeit
EP2688011A1 (en) Microparticle, in particular microparticle for tamper-proof marking of products
EP1926791A1 (en) Self-adhesive tape
EP2276637B1 (en) Method for producing a multi-coloured laser-inscribable film
WO2019206661A1 (en) Method for producing a laser-modified transfer image or heat transfer
DE10326501B4 (en) Laser-markable multilayer label material
AT523393B1 (en) Process for the production of a security element with a colored microstructure
WO2011160781A2 (en) Method for producing an identification document
DE102019132787A1 (en) Decorative film, method for producing a decorative film and method for decorating a target substrate
DE4411404B4 (en) Layer composite for transferring optically variable individual elements to be secured objects, security document and a method for producing a composite layer
DE4327995C2 (en) Method for applying a variable marking to a substrate
DE102006031189B4 (en) Process for the production of self-adhesive film products such as stickers, stick-on labels, self-adhesive security markings, self-adhesive films and the like
EP2276636A1 (en) Method for producing a laser-inscribable film with metallic surface luster
DE102019116103B4 (en) Method for labeling a printed circuit board by creating shading in a functional lacquer layer
DE102018128608A1 (en) Foil composite for coating a license plate and license plate, method and device for their production
DE102009013517A1 (en) Method for manufacturing multi-layer laser-markable foil material for labels, involves applying color, doped with laser sensitive pigment, directly on foil of adhesive bond or on un-doped color layer

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20101217

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

AX Request for extension of the european patent

Extension state: AL BA RS

RIN1 Information on inventor provided before grant (corrected)

Inventor name: PREUSS, PHILIPP

Inventor name: SIEBERT, MICHAEL

DAX Request for extension of the european patent (deleted)
17Q First examination report despatched

Effective date: 20120619

RIC1 Information provided on ipc code assigned before grant

Ipc: B41M 5/26 20060101ALI20120917BHEP

Ipc: B41M 5/24 20060101AFI20120917BHEP

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 592500

Country of ref document: AT

Kind code of ref document: T

Effective date: 20130115

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 502009006010

Country of ref document: DE

Effective date: 20130307

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

REG Reference to a national code

Ref country code: NL

Ref legal event code: VDEP

Effective date: 20130109

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130409

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130409

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130420

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130509

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130410

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130509

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

26N No opposition filed

Effective date: 20131010

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 502009006010

Country of ref document: DE

Effective date: 20131010

BERE Be: lapsed

Owner name: TESA SE

Effective date: 20130831

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20130828

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130831

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130831

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20140430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130831

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130828

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130828

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130902

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20090828

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130828

REG Reference to a national code

Ref country code: AT

Ref legal event code: MM01

Ref document number: 592500

Country of ref document: AT

Kind code of ref document: T

Effective date: 20140828

REG Reference to a national code

Ref country code: DE

Ref legal event code: R081

Ref document number: 502009006010

Country of ref document: DE

Owner name: TESA SE, DE

Free format text: FORMER OWNER: TESA SE, 20253 HAMBURG, DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140828

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20170822

Year of fee payment: 9

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 502009006010

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20190301