EP2276637B1 - Procédé de fabrication d'une feuille pouvant être marquée au laser en plusieurs couleurs - Google Patents

Procédé de fabrication d'une feuille pouvant être marquée au laser en plusieurs couleurs Download PDF

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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
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EP
European Patent Office
Prior art keywords
laser
printing
layer
lacquer
layers
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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
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EP09782323A
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German (de)
English (en)
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EP2276637A1 (fr
Inventor
Michael Siebert
Philipp Preuß
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Tesa SE
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Tesa SE
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Publication date
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Publication of EP2276637A1 publication Critical patent/EP2276637A1/fr
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Publication of EP2276637B1 publication Critical patent/EP2276637B1/fr
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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)

Claims (17)

  1. Feuille (1) pouvant être marquée au laser en plusieurs couleurs, comprenant un support (2), une première couche de laque (3) et au moins une couche de laque supplémentaire (4) sur la première couche de laque (3),
    les couleurs de deux couches de laque (3, 4) agencées l'une sur l'autre étant à chaque fois différentes, présentant les caractéristiques suivantes :
    la première couche de laque (3) et les couches de laque supplémentaires (4) sont chacune formées à partir d'une laque d'impression,
    les couches de laque d'impression (3, 4) présentent des taux d'absorption ne différant pas de plus de 20 % les uns des autres (par rapport à la longueur d'onde de 1 064 nm d'un laser Nd:YAG),
    l'épaisseur de couche ne varie pas de plus de 10 % de l'épaisseur de couche moyenne dans chaque couche de laque d'impression (3, 4),
    les couches de laque d'impression (3, 4) présentent une épaisseur de couche comprise entre 1 µm et 10 µm, et
    les couches de laque (3, 4) sont imprimées.
  2. Feuille (1) pouvant être marquée au laser en plusieurs couleurs selon la revendication 1, caractérisée en ce que les couches de laque d'impression (3, 4) sont agencées directement les unes sur les autres.
  3. Feuille (1) pouvant être marquée au laser en plusieurs couleurs selon la revendication 1 ou 2, caractérisée en ce que les couches de laque d'impression (3, 4) sont formées à partir de laques d'impression durcissant par UV.
  4. Feuille (1) pouvant être marquée au laser en plusieurs couleurs selon l'une quelconque des revendications 1 à 3, caractérisée en ce qu'au moins une couche de laque d'impression (3, 4), notamment la première (3) ou la dernière (4) couche de laque d'impression, est formée sur l'ensemble de la surface et les autres couches de laque d'impression sont formées sur une partie et/ou sur l'ensemble de la surface.
  5. Feuille (1) pouvant être marquée au laser en plusieurs couleurs selon l'une quelconque des revendications 1 à 4, caractérisée en ce que les couches de laque d'impression (3, 4) comprennent du dioxyde de titane et/ou de la suie en tant qu'absorbeur laser.
  6. Feuille (1) pouvant être marquée au laser en plusieurs couleurs selon l'une quelconque des revendications 1 à 5, caractérisée en ce que chaque couche de laque d'impression (3, 4) contient une proportion d'au moins 5 %, de préférence d'au moins 10 %, de dioxyde de titane.
  7. Feuille (1) pouvant être marquée au laser en plusieurs couleurs selon l'une quelconque des revendications 1 à 6, caractérisée en ce que chaque couche de laque d'impression (3, 4) contient une proportion d'au moins 2 %, de préférence d'au moins 4 %, de suie.
  8. Feuille (1) pouvant être marquée au laser en plusieurs couleurs selon l'une quelconque des revendications 1 à 7, caractérisée en ce que les couches de laque d'impression (3, 4) présentent une épaisseur comprise entre 1 µm et 5 µm.
  9. Feuille (1) pouvant être marquée au laser en plusieurs couleurs selon l'une quelconque des revendications 1 à 8, caractérisée en ce que le support (2) et/ou le support permanent présentent une épaisseur de couche comprise entre 50 µm et 200 µm.
  10. Feuille (1) pouvant être marquée au laser en plusieurs couleurs selon l'une quelconque des revendications 1 à 9, caractérisée en ce qu'une couche adhésive (5) est prévue, notamment sur le côté du support (2) opposé aux couches de laque d'impression (3, 4).
  11. Feuille (1) pouvant être marquée au laser en plusieurs couleurs selon l'une quelconque des revendications 1 à 10, caractérisée en ce que la feuille (1) est conçue pour être découpable au laser.
  12. Étiquette marquée au laser, constituée d'une feuille (1) pouvant être marquée au laser en plusieurs couleurs selon l'une quelconque des revendications 1 à 11, caractérisée en ce que l'étiquette est découpé au laser et présente une caractérisation en plusieurs couleurs individualisée.
  13. Étiquette marquée au laser selon la revendication 12, caractérisée en ce que l'étiquette présente une forme individualisée.
  14. Étiquette marquée au laser selon la revendication 13, caractérisée en ce que la forme individualisée et la caractérisation individualisée sont corrélées l'une avec l'autre.
  15. Procédé de fabrication d'une feuille (1) pouvant être marquée au laser en plusieurs couleurs selon l'une quelconque des revendications 1 à 11, selon lequel la première couche de laque (3) est appliquée sur le support (2) et selon lequel la ou les couches de laque supplémentaires (4) sont appliquées sur la première couche de laque (3), caractérisé en ce que les laques d'impression sont imprimées pour former les couches de laque (3, 4).
  16. Procédé selon la revendication 15, caractérisé en ce que chaque couche de laque d'impression (3, 4) est durcie avant l'impression par la couche de laque d'impression suivante.
  17. Procédé selon l'une quelconque des revendications 15 ou 16, caractérisé en ce qu'une couche supplémentaire, notamment une couche de protection transparente ou un second support (support permanent), est appliquée sur la couche de laque d'impression supérieure (4).
EP09782323A 2008-09-09 2009-08-28 Procédé de fabrication d'une feuille pouvant être marquée au laser en plusieurs couleurs Not-in-force EP2276637B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008046461A DE102008046461A1 (de) 2008-09-09 2008-09-09 Verfahren zur Herstellung einer mehrfarbig laserbeschriftbaren Folie
PCT/EP2009/061124 WO2010028962A1 (fr) 2008-09-09 2009-08-28 Procédé de fabrication d'une feuille pouvant être marquée au laser en plusieurs couleurs

Publications (2)

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

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US (1) US20110206916A1 (fr)
EP (1) EP2276637B1 (fr)
JP (1) JP2012501874A (fr)
DE (1) DE102008046461A1 (fr)
WO (1) WO2010028962A1 (fr)

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DE102004057918A1 (de) * 2004-11-30 2006-06-01 Merck Patent Gmbh Laserkennzeichnung von Wertdokumenten
DE202006013892U1 (de) * 2006-09-05 2008-01-10 Herma Gmbh Haftverbund
DE102007034636A1 (de) * 2007-07-23 2007-11-29 Tesa Ag Lasersensitives Etikett mit einer Trägerschicht aus Polyolefin

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DE102008046461A1 (de) 2010-03-11
US20110206916A1 (en) 2011-08-25
EP2276637A1 (fr) 2011-01-26
JP2012501874A (ja) 2012-01-26

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