EP2276636A1 - Procédé de fabrication d'une feuille pouvant être marquée au laser présentant un éclat superficiel métallique - Google Patents

Procédé de fabrication d'une feuille pouvant être marquée au laser présentant un éclat superficiel métallique

Info

Publication number
EP2276636A1
EP2276636A1 EP09782322A EP09782322A EP2276636A1 EP 2276636 A1 EP2276636 A1 EP 2276636A1 EP 09782322 A EP09782322 A EP 09782322A EP 09782322 A EP09782322 A EP 09782322A EP 2276636 A1 EP2276636 A1 EP 2276636A1
Authority
EP
European Patent Office
Prior art keywords
layer
gloss
laser
metallic luster
film
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09782322A
Other languages
German (de)
English (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 EP2276636A1 publication Critical patent/EP2276636A1/fr
Withdrawn legal-status Critical Current

Links

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
    • B41M5/24—Ablative recording, e.g. by burning marks; Spark recording
    • 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.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y10T428/24893—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including particulate material
    • Y10T428/24901—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including particulate material including coloring matter
    • 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
    • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
    • Y10T428/264—Up to 3 mils
    • Y10T428/265—1 mil or less
    • 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
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31678—Of metal

Definitions

  • the present invention relates to a method for producing a laser-inscribable film with metallic surface gloss with the features of the preamble of claim 1 and a laser-writable film with metallic surface gloss with the features of the preamble of claim 16.
  • Engraving layer based on a UV-curable lacquer, printed on a support carrier film in a flexographic printing process.
  • the engraving layer is used for laser marking, by being ablated locally by laser irradiation.
  • a base layer of an electron beam curable acrylate varnish is applied over the gravure layer.
  • the base layer is formed significantly thicker compared to the engraving layer, so that a complete removal in the laser marking is prevented. It is used after the inscription of the engraving layer of the contrast formation by the base layer shines through at the points where the engraving layer is removed.
  • the two layers are formed differently colored accordingly. This laser-writable film satisfies the requirements for efficient laser marking described above sufficiently.
  • a gravure layer is a layer into which an identification can be introduced 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.
  • metallic luster pigments are mixed into the gravure layer in order to obtain the metallic luster.
  • the metallic luster pigments are substantially homogeneously distributed therein to achieve a uniform effect. They act in the gravure layer as a colorant, as a gloss generator and as a laser absorber.
  • the metallic luster pigments have a significantly lower absorption coefficient, so that in the case of such films only a relatively low labeling speed can be achieved.
  • the present invention is therefore based on the problem to provide a method for producing a laser-writable film with metallic surface gloss and a corresponding film, in which the aforementioned problems are reduced and at the same time a fast laser marking is possible.
  • the teaching of the invention is based on the fundamental idea of limiting the functionality of the gravure layer by no longer providing the metallic luster through the gravure layer itself. Rather, an additional gloss layer is provided which contains the required metallic luster pigments. Although this additional layer of gloss increases the production costs, it leads to a reduction in the complexity of the engraving layer. By not having to adjust the engraving layer with regard to the metallic luster, a better adaptation to the actual task, namely the laser inscription, is possible. In particular, other laser absorbers can be used with a significantly higher absorption coefficient. Titanium dioxide and / or carbon black are particularly suitable as laser absorbers.
  • At least one laser-inscribable layer-gravure layer- is applied above a support.
  • This single engraving layer or even several gravure layers are preferably applied directly to the carrier.
  • the application of the gravure layer can be carried out by conventional coating methods. Particularly preferred is the
  • the printing method is particularly suitable when the gravure layer of a
  • Print varnish is formed.
  • the engraving layers can be formed over the entire surface or only partially. In particular, however, it is provided that at least one
  • Engraving layer is formed over the entire surface, so as not to be spatially limited in terms of laser marking.
  • printing varnish is here any ink, regardless of whether transparent or colored, called. It is essential that the application is carried out by printing technology.
  • a gloss layer is applied above the engraving layer.
  • the gloss layer is arranged directly on the engraving layer.
  • the gloss layer is formed with metallic luster pigments, through which the metallic surface gloss is achieved. Due to the functional distribution between gravure layer and gloss layer, the possibility of inscription of the gloss layer is not necessary, so that the relatively low absorption efficiency of the metallic luster pigments does not come into play.
  • metallic luster pigments With regard to the metallic luster pigments, this offers a greater choice, since they do not have to be adapted to laser absorption.
  • aluminum powder, bronze powder, pearlescent pigments, gold powder, silver powder and / or copper powder may be considered as metallic luster pigments.
  • the engraving layer can be adapted to their function of caption by laser absorption targeted, for example by the addition of laser absorbers.
  • any color design of the engraving layer by adding color pigments is possible, which in particular by the provision of multiple gravure layers a multi-colored lettering is possible.
  • platelet-shaped metallic particles whose mean size is between 1 ⁇ m and 100 ⁇ m are referred to as metallic luster pigments.
  • the average thickness of the metallic particles is preferably between 50 nm and 250 nm.
  • the platelet-shaped design has the advantage that, especially when the alignment of the metallic luster pigments takes place essentially parallel to the surface extent of the luster layer during the formation of the luster layer, then only a few points of attack on the lamination layer Surface offers. As a result, the scratch resistance is significantly increased. However, even if a metallic luster pigment is leached out of the layer, in the case that the metallic luster particles do not form a closed film, ensured that no further, adjacent metallic luster pigments are dissolved out. The gloss effect is therefore only slightly affected locally.
  • the total proportion of the metallic luster pigments is significantly reduced in contrast to the films known from practice, in which the metal luster pigments are homogeneously distributed in a relatively thick layer, without thereby impairing the metallic luster effect.
  • the gloss layer is formed such that it contains exclusively the metallic luster pigments as coloring pigments.
  • These color pigments are usually incorporated into a particularly transparent binder, preferably a polymer matrix, from which the gloss layer is then formed.
  • the gloss layer is thus formed exclusively from a transparent binder and the metallic luster pigments. This can be avoided in the best possible way impairment of laser marking of the engraving layer.
  • the gloss layer can also be formed with further additives, for example to optimally adjust the adhesion or to influence a curing.
  • UV initiators can be added as additives.
  • the gloss layer is advantageously applied with a layer thickness of at least about 0.5 ⁇ m.
  • the layer thickness of the gloss layer should not be made too large in order to keep the film structure as flat as possible and also to avoid any impairment of the laser inscription of the engraving layer by the gloss layer.
  • Layer thicknesses of not more than 5 ⁇ m, preferably of not more than 3 ⁇ m, have proven to be particularly suitable.
  • a small layer thickness has the advantage that significantly less metallic luster pigments are required compared to thicker layers.
  • the gloss layer is formed such that the metallic luster pigments do not form a closed film but only cover part of the surface of the luster layer.
  • the metallic luster pigments should cover an area of at least about 15%, preferably at least about 30%.
  • the metallic luster pigments cover an area of at most about 80%, preferably at most about 60%.
  • the absorption coefficient of the gravure layer is greater than the absorption coefficient of the gravure layer by at least a factor of 2, preferably at least a factor of 5, more preferably at least a factor of 10.
  • Absorption coefficient refers to the typical for a Nd: YAG laser
  • Wavelength of about 1064 nm The desired adjustment of the absorption coefficient can be achieved in particular by the admixture of laser absorbers in the gravure layer. Titanium dioxide and / or carbon black are particularly suitable for this purpose.
  • a transparent protective layer can additionally be applied to the glossy layer.
  • the transparent protective layer is, in particular, a protective layer based on a pressure varnish, so that the application can be effected in particular by printing.
  • the layer thickness of the protective layer should be formed between about 1 micron and about 5 microns.
  • the carrier is preferably formed with a layer thickness between about 50 microns and about 200 microns. Further details, features, objects and advantages of the present invention will be explained in more detail with reference to a drawing of a preferred embodiment. In the drawing shows
  • Fig. 1 is a schematic representation of the layer structure of a laser-writable film.
  • Fig. 1 shows a laser-writable film 1, which has metallic surface gloss.
  • This film has a carrier 2 and two laser-inscribable layers arranged above the carrier 2, namely the engraving layers 3, 4.
  • the engraving layer 3 is arranged directly on the carrier 2 and only partially formed.
  • the engraving layer 4 is formed over the entire surface and directly covers the engraving layer 3 and at the locations where the engraving layer 3 is not present, the carrier 2.
  • the two engraving layers 3, 4 are formed differently colored, so that a multi-colored labeling of the film 1 is possible ,
  • the support 2 is additionally colored, in particular in a color with strong contrast to the colors of the engraving layers 3, 4.
  • the engraving layer 3 When removing the engraving layer 4 by laser irradiation thus appears depending on whether the engraving layer 3 is present or not , the color of the engraving layer 3 or the carrier 2 by.
  • the engraving layer 3 can also be removed by a suitable choice of the laser parameters (pulse duration, intensity) in a labeling cycle.
  • the gloss layer 5 contains metallic luster pigments 6, here and preferably exclusively
  • Metallic luster pigments 6 as coloring pigments, and forms a metallic one
  • the metallic luster pigments 6 are platelet-shaped metallic luster pigments 6 made of aluminum powder. In addition to the
  • the gloss layer 5 as a component only a transparent binder such as a polymer matrix.
  • the gloss layer 5 has as constituents a transparent binder, the metallic luster pigments 6 and further additives, for example UV initiators.
  • the gloss layer 5 is here and preferably formed as a pressure varnish layer, that is based on a printing varnish, which was printed on the engraving layer 4. Especially by printing a small layer thickness can be achieved in a particularly simple manner.
  • the layer thickness of the glaze layer 5 in the present case is about 2.5 ⁇ m and, in principle, should advantageously be between about 1 ⁇ m and about 5 ⁇ m, preferably between about 1 ⁇ m and about 3 ⁇ m.
  • the metallic luster pigments 6 do not form a closed film in the luster layer 5, but here and preferably only cover about 40% of the total area.
  • the risk of larger scratches is reduced, since even in the case that a surface disposed on the surface Metal luster pigment 6 is dissolved out, this does not replace the other metal luster pigments 6, since the majority of the metallic luster pigments 6 is arranged spaced from each other.
  • the metallic luster pigments 6 here and preferably are platelet-shaped with an average size between 1 ⁇ m and 100 ⁇ m and an average thickness between 50 nm and 250 nm.

Landscapes

  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Laminated Bodies (AREA)
  • Printing Plates And Materials Therefor (AREA)

Abstract

La présente invention concerne un procédé de fabrication d'une feuille pouvant être marquée au laser présentant un éclat superficiel métallique, selon lequel au moins une couche pouvant être marquée au laser, ou couche de gravure (3, 4), est appliquée sur un support (2), en particulier directement sur le support (2). Selon l'invention, une couche brillante (5) est appliquée sur la couche de gravure (3, 4), cette couche brillante (5) contenant des pigments à éclat métallique (6).
EP09782322A 2008-09-09 2009-08-28 Procédé de fabrication d'une feuille pouvant être marquée au laser présentant un éclat superficiel métallique Withdrawn EP2276636A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810046460 DE102008046460A1 (de) 2008-09-09 2008-09-09 Verfahren zur Herstellung einer laserbeschriftbaren Folie mit metallischem Oberflächenglanz
PCT/EP2009/061123 WO2010028961A1 (fr) 2008-09-09 2009-08-28 Procédé de fabrication d'une feuille pouvant être marquée au laser présentant un éclat superficiel métallique

Publications (1)

Publication Number Publication Date
EP2276636A1 true EP2276636A1 (fr) 2011-01-26

Family

ID=41227249

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09782322A Withdrawn EP2276636A1 (fr) 2008-09-09 2009-08-28 Procédé de fabrication d'une feuille pouvant être marquée au laser présentant un éclat superficiel métallique

Country Status (5)

Country Link
US (1) US20110151210A1 (fr)
EP (1) EP2276636A1 (fr)
JP (1) JP2012501873A (fr)
DE (1) DE102008046460A1 (fr)
WO (1) WO2010028961A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020130130A1 (fr) * 2018-12-21 2020-06-25 日本カーバイド工業株式会社 Stratifié et étiquette

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2748161C3 (de) * 1977-10-27 1980-09-18 Robert Bosch Gmbh, 7000 Stuttgart Aufzeichnungsträger für Registriergeräte
JP3766468B2 (ja) * 1996-04-18 2006-04-12 麒麟麦酒株式会社 レーザ印字用媒体
DE10008851A1 (de) * 2000-02-25 2001-08-30 Giesecke & Devrient Gmbh Verfahren zur Herstellung laserbeschriftbarer Datenträger und damit hergestellte Datenträger
DE10142638A1 (de) 2001-08-31 2003-05-08 Tesa Ag Verfahren zum Herstellen einer laserbeschriftbaren Folie
US7243796B2 (en) * 2003-09-15 2007-07-17 General Mills, Inc. Consumer product display
DE102006034854A1 (de) * 2006-07-25 2008-01-31 Ovd Kinegram Ag Verfahren zur Erzeugen einer Lasermarkierung in einem Sicherheitsdokument sowie derartiges Sicherheitsdokument
EP1892689A1 (fr) * 2006-08-21 2008-02-27 3M Innovative Properties Company Etiquette contenant une décoration et/ou une information comprenant des emblèmes et procédé de fabrication IT
DE102006045495A1 (de) * 2006-09-27 2008-04-03 Mitsubishi Polyester Film Gmbh Laser-markierbare Folie

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010028961A1 *

Also Published As

Publication number Publication date
JP2012501873A (ja) 2012-01-26
WO2010028961A1 (fr) 2010-03-18
DE102008046460A1 (de) 2010-03-18
US20110151210A1 (en) 2011-06-23

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