EP0537668A2 - Process for decorating or marking a surface by means of laser radiation and use of a stamping foil in this process - Google Patents

Process for decorating or marking a surface by means of laser radiation and use of a stamping foil in this process Download PDF

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Publication number
EP0537668A2
EP0537668A2 EP92117433A EP92117433A EP0537668A2 EP 0537668 A2 EP0537668 A2 EP 0537668A2 EP 92117433 A EP92117433 A EP 92117433A EP 92117433 A EP92117433 A EP 92117433A EP 0537668 A2 EP0537668 A2 EP 0537668A2
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EP
European Patent Office
Prior art keywords
colored
layer
lacquer
lacquer layer
layers
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Application number
EP92117433A
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German (de)
French (fr)
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EP0537668A3 (en
EP0537668B1 (en
EP0537668B2 (en
Inventor
Joachim Dr. Süss
Gerhard Dr. Zinner
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Leonhard Kurz Stiftung and Co KG
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Leonhard Kurz GmbH and Co KG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/16—Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like
    • B44C1/165—Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like for decalcomanias; sheet material therefor
    • B44C1/17—Dry transfer
    • B44C1/1712—Decalcomanias applied under heat and pressure, e.g. provided with a heat activable adhesive
    • B44C1/1729—Hot stamping techniques
    • 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
    • B44—DECORATIVE ARTS
    • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/02—Pyrography
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/22—Removing surface-material, e.g. by engraving, by etching
    • B44C1/228—Removing surface-material, e.g. by engraving, by etching by laser radiation
    • 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
    • B41M5/34—Multicolour thermography

Definitions

  • the invention relates to a method for decorating or inscribing a surface by means of laser radiation, wherein at least two differently colored layers of colored lacquer are applied to one another and then at least the first layer of colored lacquer facing the viewer is removed in regions by means of the laser radiation to produce the decoration or lettering, and so the differently colored second layer of colored lacquer is exposed.
  • the invention also relates to the use of an embossing foil, in particular a hot stamping foil.
  • the method of the type mentioned at the outset is used in particular when it comes to providing precise labeling or decoration for objects which are individual items or are only produced in small numbers.
  • the one to burn out the first The laser beam serving the colored lacquer layer can be controlled very precisely with regard to its movement path, for example by means of an electron computer, it also being possible to change the strength of the laser line produced by the burnout.
  • Devices suitable for this process are commercially available and are offered, for example, by Baasel Lasertech.
  • the surface to be decorated for example the front plate of a device
  • the upper lacquer layer is then removed by the laser beam and the lower lacquer layer, which contrasts in color with the upper lacquer layer, is exposed in accordance with the desired decoration or pattern or lettering.
  • the thickness of the lacquer layer in the conventional lacquer layers there are variations in the thickness of the lacquer layer in the conventional lacquer layers, with the result that when the upper lacquer layer is burned off by means of the laser beam, this top lacquer layer may not be completely removed in the areas in which it is relatively thick .
  • the aim of the invention is now to propose a method which allows a perfect decoration or labeling of a surface by means of laser beam engraving to be accomplished with comparatively little effort.
  • layers of colored lacquer can be applied to a carrier, for example a plastic film or a metal strip, in a very simple manner Apply or have a uniform thickness. If this layer of colored lacquer is then transferred to the surface to be decorated, it is ensured that the surface to be decorated also has a layer of colored lacquer with a largely constant thickness. The power of the laser used to remove this colored lacquer layer can then be adjusted without problems once according to the thickness of the colored lacquer layer. If the laser beam is then moved over the surface to be decorated, only the top or first colored lacquer layer is actually removed, the writing thickness or engraving depth being able to be varied by changing the laser power.
  • a further advantage of the procedure according to the invention is that it is known that it is possible without difficulty, for example by means of a printing process, to apply layers of lacquer on a flexible carrier, for example a plastic film or a metal strip, in some areas, it also being possible, of course, apply differently colored paints in different areas. If such a layer of colored lacquer, consisting of differently colored areas, is used to decorate the surface of an object, this offers itself further design options that were previously not achievable with reasonable effort. For example, the surface to be decorated can be divided into differently colored areas and then labeled with a laser beam.
  • first but also the first and also the second colored lacquer layer are transferred from a carrier to the surface to be decorated in a transfer process, because even greater accuracies can then be achieved.
  • This method is particularly useful if the second, lower layer of colored lacquer consists of differently colored areas, which, for example, makes it possible to apply differently colored labels to the front panel of a device, which may make operation considerably easier.
  • Stamping foils in particular hot stamping foils for use in the method according to the invention, have at least one first and a second differently colored colored lacquer layer on top of one another, the first colored lacquer layer being arranged closer to the carrier film than the second.
  • the two layers of colored lacquer are colored in accordance with the desired decorative effect, it being possible for example for the first layer of colored lacquer to be black on the decorated object, while the second layer of colored lacquer to be exposed by the laser beam is, for example, white.
  • the properties of the colored lacquer layers can also be adjusted so that the first colored lacquer layer can be removed relatively easily by the laser beam, but otherwise has comparatively good mechanical strength, while the second colored lacquer layer, as a result of its coloring or by additives, has as little as possible of the laser beam is attacked.
  • a polyester film with a thickness of 6 to 100 ⁇ m, preferably from 19 to 38 ⁇ m, is expediently used as the carrier film. These films have sufficient strength, but also flexibility, so that they can be used as a carrier when the decorative layer is transferred from the carrier film to differently shaped surfaces.
  • the known processes can be used to transfer the decorative or colored lacquer layers from the support to the surface to be decorated, for example lifting processes, rolling processes, or processes in which the corresponding film is placed in an injection mold and then with plastic to form a Object, for example the front panel of a device is injected.
  • a clear lacquer layer preferably a thickness of 1 to 2 ⁇ m, can be provided as the protective lacquer layer, which, if it is already present on the embossing film, must also be removed during laser engraving.
  • the second colored lacquer layer of the embossing film is thicker than the first colored lacquer layer, the thickness of the second colored lacquer layer preferably being approximately 2 to 10 ⁇ m, and the thickness of the first colored lacquer layer preferably being approximately 1 to 5 ⁇ m.
  • first colored lacquer layer and a thicker second colored lacquer layer gives the possibility of being able to set the power of the laser beam used to remove the first colored lacquer layer so high that the first colored lacquer layer is reliably completely removed in the desired area, possibly even a small part the second layer of colored lacquer is removed, but it is nevertheless ensured that a sufficiently thick remainder of the second layer of colored lacquer remains, on the one hand to give a perfect decoration image and on the other but a reliable protection of the surface of the decorated object is guaranteed by the second layer of colored lacquer.
  • an embossing film in particular hot stamping film, expediently comprising a carrier film preferably composed of polyester, on which a separating layer, optionally a protective lacquer layer, at least two differently colored colored lacquer layers and an adhesive layer are arranged in order to produce the at least two differently colored colored lacquer layers a surface used.
  • the hot stamping foil shown schematically in FIG. 1 comprises a carrier film 1, which is preferably here a polyester film with a thickness of 6 to 100 microns, preferably a thickness of 19 to 38 microns.
  • the separating layer 2 generally has a thickness of at most 1 ⁇ m.
  • the protective lacquer layer 3 must therefore be correspondingly resistant to mechanical influences. In the present case, for example, it has a thickness of 1 to 2 ⁇ m.
  • Second color lacquer layer 5 Second color lacquer layer 5:
  • This layer is colored differently than the first colored lacquer layer 4, for example if the first colored lacquer layer 4 is black, white or ivory-colored.
  • the second colored lacquer layer 5 can rather be composed individually — and therefore also differently — from differently colored areas.
  • Adhesive layer 6 is Adhesive layer 6
  • the adhesive layer can also be, for example, an adhesive that can be activated by pressure or a layer of a permanently sticky material.
  • the carrier film 1 would then have to be provided on the side facing away from the lacquer layers 3, 4, 5 with a coating, for example silicone, which prevents the adhesive layer 6 from adhering to the carrier film 1, in order to be able to wind up the embossing film accordingly.
  • the separating layer 2, the lacquer layers 3 to 5 and the adhesive layer 6 can be produced according to the following recipes: Interface layer 2 toluene 95 parts Ethanol 5 parts Ester wax (dropping point 90 ° C) 0.1 parts Protective lacquer layer 3 Methyl ethyl ketone 35 parts Ethyl acetate 10 parts Cyclohexanone 8 parts Methyl methacrylate (softening point 108 ° C) 8 parts Hydroxy-functional acrylate (60% in EGA / xylene 1: 1, OH content 4.4%) 4 pieces Hydroxy-functional acrylate (60% in EGA, OH content 6%) 4 pieces Cellulose nitrate (low viscosity, 35% in alcohol) 8 parts Polyethylene dispersion (24% in xylene) 7 parts Aromatic isocyanate (50% in ethyl acetate, NCO content 8%) 16 parts First colored lacquer layer 4 (black) Methyl ethyl ketone 30 parts But
  • FIG. 2a shows a partial section of a substrate 7, for example the front panel of a device, on the surface 8 of which the lacquer layers 3 to 5 forming a release layer 9 and adhesive layer 6 of the hot stamping foil according to FIG. 1 are applied in a conventional hot stamping process.
  • both the protective lacquer layer 3 and the first black lacquer layer 4, assumed in the exemplary embodiment, are removed by means of a corresponding laser beam in order to achieve the desired decoration or lettering, in such a way that on the bottom 10 of the recessed areas 11 formed by the removal of the layers 3, 4, for example in the form of lines, letters, areas etc., which appears in the second colored lacquer layer 5 with different colors to the first colored lacquer layer 4.
  • FIG. 2 b which consists in that the removal of the lacquer layers by means of the laser beam goes exactly to the beginning of the second color lacquer layer 5.
  • the protective lacquer layer 3 is already present on the hot stamping foil, with the result that the surface 10 of the second colored lacquer layer 5 is exposed when the product is fully decorated. For certain applications it may be desirable that this area is also protected.
  • Another possibility, which results in better mechanical strength, is to apply an additional protective lacquer, starting from the state according to FIG. 2b, which then possibly fills only the worn areas 11.

Abstract

A process for decorating or marking a surface by means of laser radiation is proposed, in which at least the upper or first layer of coloured lacquer to be deposited by means of the laser beam is applied to the surface in a transfer process, in order to achieve a uniform thickness of this layer of coloured lacquer and consequently achieve a very uniform gravure. Furthermore, the use of stamping foils, in particular hot-stamping foils, of a particular design is described in the case of such a process. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren zur Dekoration oder Beschriftung einer Oberfläche mittels Laserstrahlung, wobei auf die Oberfläche wenigstens zwei unterschiedlich gefärbte Farblackschichten übereinander aufgebracht und anschliessend wenigstens die zum Betrachter weisende erste Farblackschicht mittels der Laserstrahlung bereichsweise zur Erzeugung der Dekoration oder Beschriftung entfernt und so die unterschiedlich gefärbte zweite Farblackschicht freigelegt wird. Ausserdem befasst sich die Erfindung mit der Verwendung einer Prägefolie, insbesondere Heissprägefolie.The invention relates to a method for decorating or inscribing a surface by means of laser radiation, wherein at least two differently colored layers of colored lacquer are applied to one another and then at least the first layer of colored lacquer facing the viewer is removed in regions by means of the laser radiation to produce the decoration or lettering, and so the differently colored second layer of colored lacquer is exposed. The invention also relates to the use of an embossing foil, in particular a hot stamping foil.

Das Verfahren der eingangs erwähnten Art wird insbesondere dann verwendet, wenn es darum geht, eine genaue Beschriftung bzw. Dekoration bei Gegenständen vorzusehen, die Einzelstücke sind oder nur in geringer Stückzahl angefertigt werden. Der zum Ausbrennen der ersten Farblackschicht dienende Laserstrahl kann hinsichtlich seiner Bewegungsbahn beispielsweise mittels eines Elektronenrechners ohne Schwierigkeiten sehr genau gesteuert werden, wobei auch die Möglichkeit besteht, die Stärke des durch das Ausbrennen erzeugten Laserstriches zu verändern. Für dieses Verfahren geeignete Geräte sind handelsüblich und werden beispielsweise von der Fa. Baasel Lasertech angeboten.The method of the type mentioned at the outset is used in particular when it comes to providing precise labeling or decoration for objects which are individual items or are only produced in small numbers. The one to burn out the first The laser beam serving the colored lacquer layer can be controlled very precisely with regard to its movement path, for example by means of an electron computer, it also being possible to change the strength of the laser line produced by the burnout. Devices suitable for this process are commercially available and are offered, for example, by Baasel Lasertech.

Aus der EP O 393 956 A 1 ist auch schon ein Verfahren zur Erzeugung von Sicherheitsmarkierungen auf einer Oberfläche bekannt, bei welchem eine von einer Laserstrahlung absorbierenden oberen Schicht abgedeckte Farbschicht durch bereichsweises Abtragen der oberen Schicht mittels eines Laserstrahls entsprechend freigelegt wird. Über die Aufbringung der beiden Schichten enthält die Druckschrift jedoch keine Angaben.From EP 0 393 956 A1, a method for producing security markings on a surface is already known, in which an ink layer covered by a laser radiation absorbing layer is appropriately exposed by removing the top layer in regions by means of a laser beam. However, the publication contains no information about the application of the two layers.

Bisher geht man so vor, dass die zu dekorierende Oberfläche, beispielsweise die Frontplatte eines Gerätes, mittels üblicher Verfahren mit zwei unterschiedlich farbigen Lackschichten versehen wird. Durch den Laserstrahl wird dann die obere Lackschicht entfernt und entsprechend der gewünschten Dekoration bzw. Musterung oder Beschriftung die untere, zu der oberen Lackschicht farblich kontrastierende Lackschicht freigelegt. Hierbei besteht jedoch das Problem, dass bei den konventionellen Lackschichten sich Dickenvariationen der Lackschicht ergeben, mit der Folge, dass beim Abbrennen der oberen Lackschicht mittels des Laserstrahls unter Umständen diese obere Lackschicht in den Bereichen, in denen sie relativ dick ist, nicht vollständig abgetragen wird. Verwendet man eine höhere Laser-Leistung, kann man zwar erreichen, dass die obere Lackschicht zuverlässig auch dort, wo sie dicker ist, abgetragen wird. Es besteht dann jedoch die Gefahr, dass in Bereichen, in denen die obere Lackschicht dünner ist, die untere Lackschicht mit angegriffen wird, was so weit gehen kann, dass auch die untere Lackschicht völlig entfernt oder zumindest stark beschädigt wird. Eine weitere Gefahr ist die, dass der mittels des Laserstrahls erzeugte Strich dann, wenn die Lackschichten unterschiedlich dick sind, trotz gleichbleibender Laserleistung verschiedene Breiten bzw. Stärken aufweist, wodurch natürlich auch das Aussehen des entsprechend dekorierten bzw. beschrifteten Gegenstandes beeinträchtigt wird. Um eine brauchbare Laser-Beschriftung zu erzeugen, musste man somit bisher mit ganz erheblichem Aufwand versuchen, die obere, durch den Laserstrahl abzutragende, Lackschicht in möglichst gleichmässiger Dicke aufzutragen, wodurch sich die Herstellung entsprechender Gegenstände ganz erheblich verteuert hat, so dass Laser-Beschriftung bzw. Dekoration bisher nur für einige wenige Einsatzgebiete, insbesondere bei hochwertigen oder sehr teueren Geräten Verwendung fand.So far, one has proceeded in such a way that the surface to be decorated, for example the front plate of a device, is provided with two differently colored layers of paint using customary methods. The upper lacquer layer is then removed by the laser beam and the lower lacquer layer, which contrasts in color with the upper lacquer layer, is exposed in accordance with the desired decoration or pattern or lettering. However, there is the problem here that there are variations in the thickness of the lacquer layer in the conventional lacquer layers, with the result that when the upper lacquer layer is burned off by means of the laser beam, this top lacquer layer may not be completely removed in the areas in which it is relatively thick . If you use a higher laser power, you can achieve that the upper layer of paint is reliable even where it is thicker is removed. However, there is then the danger that in areas in which the upper lacquer layer is thinner, the lower lacquer layer is also attacked, which can go so far that the lower lacquer layer is also completely removed or at least severely damaged. A further danger is that the line generated by the laser beam, when the layers of paint are of different thickness, will have different widths or thicknesses despite the laser power remaining constant, which of course also affects the appearance of the appropriately decorated or labeled object. In order to produce a usable laser inscription, it has so far had to be attempted with considerable effort to apply the upper layer of lacquer that is to be removed by the laser beam in a thickness that is as uniform as possible, which has made the manufacture of the corresponding objects considerably more expensive, so that laser inscription or decoration has so far only been used for a few areas of application, in particular for high-quality or very expensive devices.

Ziel der Erfindung ist es nun, ein Verfahren vorzuschlagen, welches es gestattet, bei vergleichsweise geringem Aufwand eine einwandfreie Dekoration bzw. Beschriftung einer Oberfläche mittels Laserstrahl-Gravur zu bewerkstelligen.The aim of the invention is now to propose a method which allows a perfect decoration or labeling of a surface by means of laser beam engraving to be accomplished with comparatively little effort.

Zu diesem Zweck wird nach der Erfindung bei dem Verfahren der eingangs erwähnten Art nun vorgeschlagen derart vorzugehen, dass wenigstens die erste Farblackschicht in einem Transferverfahren von einem Träger auf die zu dekorierende Oberfläche übertragen wird.For this purpose, it is proposed according to the invention in the method of the type mentioned at the outset to proceed in such a way that at least the first color lacquer layer is transferred from a carrier to the surface to be decorated in a transfer method.

Es ist bekannt, dass sich auf einem Träger, beispielsweise einer Kunststoffolie oder einem Metallband, Farblackschichten ohne grossen Aufwand in sehr gleichmässiger Dicke auftragen bzw. erzeugen lassen. Überträgt man diese Farblackschicht dann auf die zu dekorierende Oberfläche, ist gewährleistet, dass auch die zu dekorierende Oberfläche eine Farblackschicht mit weitgehend gleichbleibender Dicke aufweist. Die Leistung des zum Abtragen dieser Farblackschicht dienenden Lasers kann dann ohne Probleme einmal entsprechend der Dicke der Farblackschicht eingestellt werden. Wird der Laserstrahl dann über die zu dekorierende Oberfläche bewegt, wird tatsächlich nur die obere bzw. erste Farblackschicht entfernt, wobei durch Veränderung der Laserleistung die Schriftstärke bzw. Gravurtiefe variiert werden kann. Irgendwelche Abweichungen von dem gewünschten Bild der Dekoration bzw. Beschriftung infolge von Dickenänderungen der ersten Farblackschicht sind bei einem Vorgehen gemäss der Erfindung nicht zu befürchten. Die Übertragung der Farblackschicht auf die Oberfläche kann mittels der bekannten Transferverfahren ohne übermässigen Aufwand durchgeführt werden. Erfindungsgemäss wird also ein Verfahren vorgeschlagen, welches es gestattet, die Qualität der Dekoration einer Oberfläche mittels Laser-Abtrags erheblich zu verbessern, ohne dass hierzu ein übermässiger konstruktiver oder apparativer Aufwand erforderlich wäre.It is known that layers of colored lacquer can be applied to a carrier, for example a plastic film or a metal strip, in a very simple manner Apply or have a uniform thickness. If this layer of colored lacquer is then transferred to the surface to be decorated, it is ensured that the surface to be decorated also has a layer of colored lacquer with a largely constant thickness. The power of the laser used to remove this colored lacquer layer can then be adjusted without problems once according to the thickness of the colored lacquer layer. If the laser beam is then moved over the surface to be decorated, only the top or first colored lacquer layer is actually removed, the writing thickness or engraving depth being able to be varied by changing the laser power. Any deviations from the desired image of the decoration or lettering as a result of changes in the thickness of the first color lacquer layer are not to be feared in a procedure according to the invention. The transfer of the colored lacquer layer to the surface can be carried out by means of the known transfer processes without undue effort. According to the invention, therefore, a method is proposed which allows the quality of the decoration of a surface to be significantly improved by means of laser ablation, without this requiring an excessive outlay in terms of construction or apparatus.

Ein weiterer Vorzug des Vorgehens gemäss der Erfindung ist darin zu sehen, dass es bekanntlich ohne Schwierigkeiten möglich ist, z.B. mittels eines Druckverfahrens, auf einem flexiblen Träger, z.B. einer Kunststoffolie oder einem Metallband, Lackschichten nur bereichsweise aufzubringen, wobei natürlich auch die Möglichkeit besteht, in unterschiedlichen Bereich unterschiedlich gefärbte Lacke aufzutragen. Verwendet man eine solche, aus unterschiedlich gefärbten Bereichen bestehende Farblackschicht zur Dekoration der Oberfläche eines Gegenstandes, bieten sich weitere, bisher mit vertretbarem Aufwand nicht erreichbare Gestaltungsmöglichkeiten. Man kann beispielsweise die zu dekorierende Oberfläche in unterschiedlich farbige Bereiche aufteilen und diese dann jeweils mittels eines Laserstrahls beschriften. Hierdurch ist es z.B. möglich, bestimmte Schriften auf der Frontplatte eines Gerätes in einer anderen Farbe auszuführen als die restliche Beschriftung, um diese Beschriftung hervorzuheben oder bestimmten Bedienungsvorgängen zuzuordnen. Wollte man dies bisher tun, musste man die zu dekorierende Oberfläche entsprechend abdecken und dann die einzelnen Bereiche in unterschiedlichen Arbeitgsgängen beispielsweise mit Lacken der gewünschten Farbe spritzen. Es leuchtet ein, dass es bei einer derartigen Vorgehensweise nahezu ausgeschlossen ist, auch nur annähernd gleiche Dicke für die verschieden gefärbten Lackbereiche zu erzielen, nachdem ja die Dicke der Lackschicht sowohl von der Viskosität des aufgespritzten Lackes als auch von dessen Pigmentierung sowie den Verlaufseigenschaften abhängt.A further advantage of the procedure according to the invention is that it is known that it is possible without difficulty, for example by means of a printing process, to apply layers of lacquer on a flexible carrier, for example a plastic film or a metal strip, in some areas, it also being possible, of course, apply differently colored paints in different areas. If such a layer of colored lacquer, consisting of differently colored areas, is used to decorate the surface of an object, this offers itself further design options that were previously not achievable with reasonable effort. For example, the surface to be decorated can be divided into differently colored areas and then labeled with a laser beam. This makes it possible, for example, to carry out certain fonts on the front panel of a device in a different color than the rest of the lettering, in order to emphasize this lettering or to assign specific operations. If you wanted to do this previously, you had to cover the surface to be decorated accordingly and then spray the individual areas in different work steps, for example with paints of the desired color. It is obvious that with such a procedure it is almost impossible to achieve even approximately the same thickness for the differently colored lacquer areas, since the thickness of the lacquer layer depends both on the viscosity of the sprayed lacquer and on its pigmentation and the flow properties.

Besonders zweckmässig ist es, wenn nicht nur die erste sondern sowohl die erste als auch die zweite Farblackschicht in einem Transferverfahren von einem Träger auf die zu dekorierende Oberfläche übertragen werden, weil sich dann noch grössere Genauigkeiten erreichen lassen. Dieses Verfahren ist vorallem auch dann zweckmässig, wenn die zweite, untere Farblackschicht aus unterschiedlich gefärbten Bereichen besteht, wodurch zum Beispiel die Möglichkeit gegeben ist, auf der Frontplatte eines Gerätes unterschiedlich farbige Beschriftungen anzubringen, wodurch unter Umständen die Bedienung erheblich erleichtert werden kann.It is particularly expedient if not only the first but also the first and also the second colored lacquer layer are transferred from a carrier to the surface to be decorated in a transfer process, because even greater accuracies can then be achieved. This method is particularly useful if the second, lower layer of colored lacquer consists of differently colored areas, which, for example, makes it possible to apply differently colored labels to the front panel of a device, which may make operation considerably easier.

Um die mechanische Beständigkeit der dekorierten Oberfläche zu verbessern, kann man vorteilhafterweise so vorgehen, dass auf die erste Farblackschicht vor oder nach der Laserbearbeitung eine transparente Schutzlackschicht aufgebracht wird, die eine entsprechend hohe mechanische Festigkeit aufweist.In order to improve the mechanical resistance of the decorated surface, one can advantageously proceed in such a way that a transparent protective lacquer layer which has a correspondingly high mechanical strength is applied to the first color lacquer layer before or after the laser processing.

In der Praxis wird man zweckmässig so vorgehen, dass sämtliche Lackschichten mittels Transferfolien aufgebracht werden, die einen Trägerfilm und auf diesem ablösbar die Lackschichten aufweist, wobei besonders zweckmässig mindestens die erste Farblackschicht mittels einer Prägefolie, vorzugsweise einer Heissprägefolie, aufgebracht wird. Derartige Heissprägefolien lassen sich ohne weiteres in den von der Fertigung von Heissprägefolien her bekannten Verfahren herstellen.In practice, one will expediently proceed in such a way that all lacquer layers are applied by means of transfer foils which have a carrier film and the lacquer layers detachably thereon, with at least the first colored lacquer layer being expediently applied by means of an embossing foil, preferably a hot stamping foil. Such hot stamping foils can be easily produced in the processes known from the production of hot stamping foils.

Prägefolien, insbesondere Heissprägefolien zur Verwendung in dem erfindungsgemässen Verfahren weisen übereinander wenigstens eine erste und eine zweite unterschiedlich farbige Farblackschicht auf, wobei die erste Farblackschicht näher beim Trägerfilm angeordnet ist als die zweite. Die beiden Farblackschichten werden gemäss dem gewünschten Dekorationseffekt gefärbt, wobei zum Beispiel die erste, am dekorierten Gegenstand obere Farblackschicht schwarz sein kann, während die zweite, durch den Laserstrahl freizulegende Farblackschicht beispielsweise weiss ist. Die Eigenschaften der Farblackschichten lassen sich weiterhin so einstellen, dass die erste Farblackschicht relativ leicht durch den Laserstrahl abgetragen werden kann, jedoch ansonsten vergleichsweise gute mechanische Festigkeit besitzt, während die zweite Farblackschicht, beispielsweise infolge ihrer Farbgebung oder durch Zusätze, von dem Laserstrahl möglichst wenig angegriffen wird. Als Trägerfilm wird bei solchen Prägefolien zweckmässig ein Polyesterfilm einer Dicke von 6 bis 100 µm, vorzugsweise von 19 bis 38 µm eingesetzt. Diese Filme besitzen hinreichende Festigkeit, aber auch Flexibilität, um sie als Träger bei Übertragung der Dekorschicht von dem Trägerfilm auf unterschiedlich geformte Oberflächen verwenden zu können. Zum Übertragen der Dekor- bzw. Farblackschichten von dem Träger auf die zu dekorierende Oberfläche können die an sich bekannten Verfahren verwendet werden, beispielsweise Hubverfahren, Abrollverfahren, oder auch Verfahren, bei denen die entsprechende Folie in eine Spritzgiessform eingelegt und dann mit Kunststoff zur Bildung eines Gegenstandes, beispielsweise der Frontplatte eines Gerätes, hinterspritzt wird. Als Schutzlackschicht kann eine Klarlackschicht, vorzugsweise einer Dicke von 1 bis 2 µm, vorgesehensein die, wenn sie bereits von Haus aus auf der Prägefolie vorhanden ist, bei der Laser-Gravur ebenfalls abgetragen werden muss. Vorteilhaft ist, wenn die zweite Farblackschicht der Prägefolie dicker ist als die erste Farblackschicht, wobei die Dicke der zweiten Farblackschicht vorzugsweise ca. 2 bis 10 µm, die Dicke der ersten Farblackschicht vorzugsweise etwa 1 bis 5 µm beträgt. Die Verwendung einer vergleichsweise dünnen ersten Farblackschicht und einer demgegenüber dickeren zweiten Farblackschicht gibt die Möglichkeit, die Leistung des zum Abtragen der ersten Farblackschicht dienenden Laserstrahls so hoch einstellen zu können, dass zuverlässig die erste Farblackschicht in dem gewünschten Bereich vollständig abgetragen, gegebenenfalls sogar ein kleiner Teil der zweiten Farblackschicht mit weggenommen wird, trotzdem jedoch gewährleistet ist, dass noch ein hinreichend dicker Rest der zweiten Farblackschicht verbleibt, um einerseits ein einwandfreies Dekorationsbild zu ergeben, andererseits aber ein zuverlässiger Schutz der Oberfläche des dekorierten Gegenstandes durch die zweite Farblackschicht gewährleistet bleibt.Stamping foils, in particular hot stamping foils for use in the method according to the invention, have at least one first and a second differently colored colored lacquer layer on top of one another, the first colored lacquer layer being arranged closer to the carrier film than the second. The two layers of colored lacquer are colored in accordance with the desired decorative effect, it being possible for example for the first layer of colored lacquer to be black on the decorated object, while the second layer of colored lacquer to be exposed by the laser beam is, for example, white. The properties of the colored lacquer layers can also be adjusted so that the first colored lacquer layer can be removed relatively easily by the laser beam, but otherwise has comparatively good mechanical strength, while the second colored lacquer layer, as a result of its coloring or by additives, has as little as possible of the laser beam is attacked. In the case of such embossing foils, a polyester film with a thickness of 6 to 100 μm, preferably from 19 to 38 μm, is expediently used as the carrier film. These films have sufficient strength, but also flexibility, so that they can be used as a carrier when the decorative layer is transferred from the carrier film to differently shaped surfaces. The known processes can be used to transfer the decorative or colored lacquer layers from the support to the surface to be decorated, for example lifting processes, rolling processes, or processes in which the corresponding film is placed in an injection mold and then with plastic to form a Object, for example the front panel of a device is injected. A clear lacquer layer, preferably a thickness of 1 to 2 μm, can be provided as the protective lacquer layer, which, if it is already present on the embossing film, must also be removed during laser engraving. It is advantageous if the second colored lacquer layer of the embossing film is thicker than the first colored lacquer layer, the thickness of the second colored lacquer layer preferably being approximately 2 to 10 μm, and the thickness of the first colored lacquer layer preferably being approximately 1 to 5 μm. The use of a comparatively thin first colored lacquer layer and a thicker second colored lacquer layer gives the possibility of being able to set the power of the laser beam used to remove the first colored lacquer layer so high that the first colored lacquer layer is reliably completely removed in the desired area, possibly even a small part the second layer of colored lacquer is removed, but it is nevertheless ensured that a sufficiently thick remainder of the second layer of colored lacquer remains, on the one hand to give a perfect decoration image and on the other but a reliable protection of the surface of the decorated object is guaranteed by the second layer of colored lacquer.

Bei dem erfindungsgemässen Verfahren wird zweckmässigerweise eine Prägefolie, insbesondere Heissprägefolie, umfassend einen vorzugsweise aus Polyester bestehenden Trägerfilm, auf dem aufeinanderfolgend eine Trennschicht, gegebenenfalls eine Schutzlackschicht, wenigstens zwei unterschiedlich farbige Farblackschichten sowie eine Kleberschicht angeordnet sind, zur Erzeugung der wenigstens zwei unterschiedlich gefärbten Farblackschichten auf einer Oberfläche verwendet.In the method according to the invention, an embossing film, in particular hot stamping film, expediently comprising a carrier film preferably composed of polyester, on which a separating layer, optionally a protective lacquer layer, at least two differently colored colored lacquer layers and an adhesive layer are arranged in order to produce the at least two differently colored colored lacquer layers a surface used.

Weitere Einzelheiten und Vorteile der Erfindung ergeben sich aus der folgenden Beschreibung eines Ausführungsbeispiels einer Heissprägefolie zur Verwendung gemäss der Erfindung sowie der schematischen Erläuterung des erfindungsgemässen Verfahrens an Hand der Zeichnung. Es zeigen:

Fig. 1
einen Teilschnitt durch eine Heissprägefolie,
Fig. 2a
im Teilschnitt ein mit einer entsprechenden Heissprägefolie oberflächlich versehenes Substrat und
Fig. 2b
einen Schnitt entsprechend Fig. 2a nach Durchführung der Laserbehandlung.
Further details and advantages of the invention result from the following description of an exemplary embodiment of a hot stamping foil for use according to the invention and the schematic explanation of the method according to the invention with reference to the drawing. Show it:
Fig. 1
a partial section through a hot stamping foil,
Fig. 2a
in partial section a substrate provided with a corresponding hot stamping foil and
Fig. 2b
a section corresponding to Fig. 2a after performing the laser treatment.

Die in Fig. 1 schematisch gezeigte Heissprägefolie umfasst einen Trägerfilm 1, wobei es sich hier vorzugsweise um einen Polyesterfilm einer Dicke von 6 bis 100 µm, bevorzugt einer Dicke von 19 bis 38 µm handelt.The hot stamping foil shown schematically in FIG. 1 comprises a carrier film 1, which is preferably here a polyester film with a thickness of 6 to 100 microns, preferably a thickness of 19 to 38 microns.

Auf diesem Trägerfilm 1 sind nacheinander folgende Schichten vorhanden, die in dem an sich von der Herstellung von Heissprägefolien bekannten üblichen Verfahren aufgebracht sind:The following layers are present in succession on this carrier film 1, which are applied in the customary process known per se from the production of hot stamping foils:

Trennschicht 2:Interface layer 2:

Hierbei handelt es sich im allgemeinen um eine bei Wärmeeinwirkung weich werdende Schicht, die die Ablösung der weiteren Schichten von dem Trägerfilm 1 gestattet. Die Trennschicht 2 hat im allgemeinen eine Dicke von höchstens 1 µm.This is generally a layer which softens when exposed to heat and which allows the further layers to be detached from the carrier film 1. The separating layer 2 generally has a thickness of at most 1 μm.

Schutzlackschicht 3:Protective lacquer layer 3:

Es handelt sich dabei um eine transparente Lackschicht mit der Aufgabe, die freie Oberfläche des mit der Heissprägefolie dekorierten Gegenstandes gegen mechanische Beschädigungen weitgehend zu schützen. Die Schutzlackschicht 3 muss deswegen gegen mechanische Einwirkungen entsprechend widerstandsfähig sein. Sie hat im vorliegenden Fall beispielsweise eine Dicke von 1 bis 2 µm.It is a transparent lacquer layer with the task of largely protecting the free surface of the object decorated with the hot stamping foil against mechanical damage. The protective lacquer layer 3 must therefore be correspondingly resistant to mechanical influences. In the present case, for example, it has a thickness of 1 to 2 μm.

Erste Farblackschicht 4:First colored lacquer layer 4:

Hierbei handelt es sich beispielsweise um eine mittels Russ entsprechend gefärbte Lackschicht einer Dicke von etwa 1 bis 5 µm, die mit Hilfe eines Laserstrahls abgetragen werden kann.This is, for example, a lacquer layer correspondingly colored by means of carbon black and having a thickness of approximately 1 to 5 μm, which can be removed with the aid of a laser beam.

Zweite Farblackschicht 5:Second color lacquer layer 5:

Diese Schicht ist anders gefärbt als die erste Farblackschicht 4, beispielsweise, wenn die erste Farblackschicht 4 schwarz ist, weiss oder elfenbeinfarbig.This layer is colored differently than the first colored lacquer layer 4, for example if the first colored lacquer layer 4 is black, white or ivory-colored.

Es besteht aber auch die Möglichkeit, die zweite Farblackschicht 5 -ebenso wie die erste Farblackschicht 4-nicht über die gesamte Fläche der Heissprägefolie und damit nicht über die gesamte zu dekorierende Oberfläche in der gleichen Farbstellung vorzusehen. Die Farblackschichten 4 und 5 können vielmehr einzeln -und damit auch unterschiedlich- aus verschiedenfarbigen Bereichen zusammengesetzt sein.However, there is also the possibility of not providing the second colored lacquer layer 5 — just like the first colored lacquer layer 4 — over the entire surface of the hot stamping foil and thus not over the entire surface to be decorated in the same color. The colored lacquer layers 4 and 5 can rather be composed individually — and therefore also differently — from differently colored areas.

Kleberschicht 6:Adhesive layer 6:

Hierbei handelt es sich um eine bei Heissprägefolien an sich übliche und bekannte Kleberschicht einer Dicke von etwa 1 bis 10 µm, wobei die Kleberschicht für eine Heissprägefolie so zusammengesetzt ist, dass sie erst bei entsprechender Wärmeeinwirkung klebrig wird. Für Prägefolien, die ohne Wärmeeinwirkung verarbeitet werden sollen, kann die Kleberschicht auch beispielsweise ein durch Druck aktivierbarer Kleber oder eine Schicht eines ständig klebrigen Materials sein. Im letzteren Falle müsste allerdings dann der Trägerfilm 1 auf der den Lackschichten 3, 4, 5 abgekehrten Seite mit einer ein Anhaften der Kleberschicht 6 am Trägerfilm 1 verhindernden Beschichtung, beispielsweise Silikon, versehen sein, um die Prägefolie entsprechend aufwickeln zu können.This is an adhesive layer which is customary and known per se in hot stamping foils and has a thickness of approximately 1 to 10 μm, the adhesive layer for a hot stamping foil being composed in such a way that it only becomes tacky when exposed to the appropriate heat. For stamping foils that are to be processed without exposure to heat, the adhesive layer can also be, for example, an adhesive that can be activated by pressure or a layer of a permanently sticky material. In the latter case, however, the carrier film 1 would then have to be provided on the side facing away from the lacquer layers 3, 4, 5 with a coating, for example silicone, which prevents the adhesive layer 6 from adhering to the carrier film 1, in order to be able to wind up the embossing film accordingly.

Die Trennschicht 2, die Lackschichten 3 bis 5 sowie die Kleberschicht 6 können nach folgenden Rezepturen hergestellt sein: Trennschicht 2 Toluol 95 Teile Ethanol 5 Teile Esterwachs (Tropfpunkt 90°C) 0,1 Teile Schutzlackschicht 3 Methylethylketon 35 Teile Ethylacetat 10 Teile Cyclohexanon 8 Teile Methylmethacrylat (Erweichungspkt. 108°C) 8 Teile Hydroxyfunktionelles Acrylat (60% in EGA/Xylol 1:1, OH-Gehalt 4,4%) 4 Teile Hydroxyfunktionelles Acrylat (60% in EGA, OH-Gehalt 6%) 4 Teile Cellulosenitrat (niedrigviskos, 35% in Alkohol) 8 Teile Polyethylendispersion (24% in Xylol) 7 Teile Aromatisches Isocyanat (50% in Ethylacetat, NCO-Gehalt 8%) 16 Teile Erste Farblackschicht 4 (schwarz) Methylethylketon 30 Teile Butylacetat 98/100 28 Teile Cylohexanon 20 Teile PVC/PVA-Copolymer (85/15) 11 Teile Russ 11 Teile Zweite Farblackschicht 5 (weiss) Methylethylketon 38 Teile Aceton 11 Teile Cyclohexanon 11 Teile Polyvinylbutyral (Erweichungspkt. 125°C) 6 Teile Lineares Polyurethan (Fp. 220°C) 8 Teile Ti0₂ 26 Teile Kleberschicht 6 Toluol 15 Teile Aceton 15 Teile Ethanol 38 Teile Copolymeres Methyl-/n-butyl-methacrylat (40 % in Xylol; tg = 78°C) 15 Teile Polyethylmethacrylat (tg = 63°C) 5 Teile Polyvinylacetat (50 % in Ethanol) 4 Teile Si0₂ 2 Teile Ti0₂ 6 Teile The separating layer 2, the lacquer layers 3 to 5 and the adhesive layer 6 can be produced according to the following recipes: Interface layer 2 toluene 95 parts Ethanol 5 parts Ester wax (dropping point 90 ° C) 0.1 parts Protective lacquer layer 3 Methyl ethyl ketone 35 parts Ethyl acetate 10 parts Cyclohexanone 8 parts Methyl methacrylate (softening point 108 ° C) 8 parts Hydroxy-functional acrylate (60% in EGA / xylene 1: 1, OH content 4.4%) 4 pieces Hydroxy-functional acrylate (60% in EGA, OH content 6%) 4 pieces Cellulose nitrate (low viscosity, 35% in alcohol) 8 parts Polyethylene dispersion (24% in xylene) 7 parts Aromatic isocyanate (50% in ethyl acetate, NCO content 8%) 16 parts First colored lacquer layer 4 (black) Methyl ethyl ketone 30 parts Butyl acetate 98/100 28 parts Cyclohexanone 20 parts PVC / PVA copolymer (85/15) 11 parts Soot 11 parts Second color coat 5 (white) Methyl ethyl ketone 38 pieces acetone 11 parts Cyclohexanone 11 parts Polyvinyl butyral (softening point 125 ° C) 6 parts Linear polyurethane (mp. 220 ° C) 8 parts Ti0₂ 26 parts Adhesive layer 6 toluene 15 parts acetone 15 parts Ethanol 38 pieces Copolymer methyl / n-butyl methacrylate (40% in xylene; tg = 78 ° C) 15 parts Polyethyl methacrylate (tg = 63 ° C) 5 parts Polyvinyl acetate (50% in ethanol) 4 pieces Si0₂ 2 parts Ti0₂ 6 parts

In Fig. 2a ist im Teilschnitt ein Substrat 7, beispielsweise die Frontplatte eines Gerätes, gezeigt, an dessen Oberfläche 8 die eine Ablöseschicht 9 bildenden Lackschichten 3 bis 5 sowie Kleberschicht 6 der Heissprägefolie gemäss Fig. 1 in einem üblichen Heissprägevorgang angebracht sind.FIG. 2a shows a partial section of a substrate 7, for example the front panel of a device, on the surface 8 of which the lacquer layers 3 to 5 forming a release layer 9 and adhesive layer 6 of the hot stamping foil according to FIG. 1 are applied in a conventional hot stamping process.

Ausgehend von der im wesentlichen einheitlich dekorierten Oberfläche gemäss Fig. 2a wird dann mittels eines entsprechenden Laserstrahls zur Erzielung der gewünschten Dekoration bzw. Beschriftung sowohl die Schutzlackschicht 3 als auch die erste, beim Ausführungsbeispiel angenommen schwarze Farblackschicht 4 abgetragen, und zwar derart, dass am Grund 10 der durch Abtragung der Schichten 3, 4 entstandenen vertieften Bereiche 11, beispielsweise in Form von Strichen, Buchstaben, Flächen etc., die zur ersten Farblackschicht 4 farblich unterschiedliche zweite Farblackschicht 5 zum Vorschein kommt. Dabei ist allerdings in Fig. 2b der Idealzustand gezeigt, der darin besteht, dass die Abtragung der Lackschichten mittels des Laserstrahls genau bis zum Beginn der zweiten Farblackschicht 5 geht. Tatsächlich wird man im allgemeinen so vorgehen, dass noch eine geringe Menge der Farblackschicht 5 mit abgetragen wird, um sicherzustellen, dass die freigelegten Bereiche der zweiten Farblackschicht 5 ein einheitliches Aussehen besitzen. Sofern die Farblackschicht 5 über die Oberfläche des zu dekorierenden Gegenstandes aus Bereichen unterschiedlicher Farbe zusammengesetzt ist, werden natürlich die freigelegten Teile 10 der zweiten Farblackschicht 5 entsprechend unterschiedliche Farbe besitzen.Starting from the essentially uniformly decorated surface according to FIG. 2a, both the protective lacquer layer 3 and the first black lacquer layer 4, assumed in the exemplary embodiment, are removed by means of a corresponding laser beam in order to achieve the desired decoration or lettering, in such a way that on the bottom 10 of the recessed areas 11 formed by the removal of the layers 3, 4, for example in the form of lines, letters, areas etc., which appears in the second colored lacquer layer 5 with different colors to the first colored lacquer layer 4. However, the ideal state is shown in FIG. 2 b, which consists in that the removal of the lacquer layers by means of the laser beam goes exactly to the beginning of the second color lacquer layer 5. In fact, one will generally proceed in such a way that a small amount of the colored lacquer layer 5 is also removed in order to ensure that the exposed areas of the second colored lacquer layer 5 have a uniform appearance. If the colored lacquer layer 5 over the surface of the object to be decorated from areas of different colors is composed, the exposed parts 10 of the second color lacquer layer 5 will of course have correspondingly different colors.

Im Ausführungsbeispiel wurde davon ausgegangen, dass die Schutzlackschicht 3 bereits auf der Heissprägefolie vorhanden ist, was zur Folge hat, dass die Oberfläche 10 der zweiten Farblackschicht 5 bei fertig dekoriertem Produkt freiliegt. Für bestimmte Anwendungsfälle kann es gewünscht sein, dass auch diese Fläche geschützt ist. In diesem Fall besteht entweder die Möglichkeit, eine Heissprägefolie zu verwenden, die keine Schutzlackschicht 3 aufweist und dann insgesamt nach der Laser-Gravur eine Schutzlackschicht anzubringen, die dann auch die vertieften Bereiche 11 ausfüllt. Eine andere Möglichkeit, die eine bessere mechanische Festigkeit ergibt, besteht darin, ausgehend von dem Zustand gemäss Fig. 2b zusätzlich einen weiteren Schutzlack aufzubringen, der dann eventuell nur die abgetragenen Bereiche 11 ausfüllt.In the exemplary embodiment, it was assumed that the protective lacquer layer 3 is already present on the hot stamping foil, with the result that the surface 10 of the second colored lacquer layer 5 is exposed when the product is fully decorated. For certain applications it may be desirable that this area is also protected. In this case, there is either the possibility of using a hot stamping foil which does not have a protective lacquer layer 3 and then, after the laser engraving, to apply a protective lacquer layer overall which then also fills the recessed areas 11. Another possibility, which results in better mechanical strength, is to apply an additional protective lacquer, starting from the state according to FIG. 2b, which then possibly fills only the worn areas 11.

Claims (6)

Verfahren zur Dekoration oder Beschriftung einer Oberfläche mittels Laserstrahlung, wobei auf die Oberfläche wenigstens zwei unterschiedlich gefärbte Farblackschichten übereinander aufgebracht und anschliessend wenigstens die zum Betrachter weisende erste Farblackschicht mittels der Laserstrahlung bereichsweise zur Erzeugung der Dekoration oder Beschriftung entfernt und so die unterschiedlich gefärbte zweite Farblackschicht freigelegt wird,
dadurch gekennzeichnet,
dass wenigstens die erste Farblackschicht (4) in einem Transferverfahren von einem Träger (1) auf die Oberfläche (8) übertragen wird.Method for decorating or inscribing a surface by means of laser radiation, wherein at least two differently colored colored lacquer layers are applied to one another on the surface and then at least the first colored lacquer layer facing the viewer is removed in some areas by means of the laser radiation to produce the decoration or inscription, and the differently colored second colored lacquer layer is thus exposed ,
characterized,
that at least the first colored lacquer layer (4) is transferred from a carrier (1) to the surface (8) in a transfer process. Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
dass die erste und die zweite Farblackschicht (4, 5) in einem Transferverfahren von einem Träger (1) auf die Oberfläche (8) übertragen werden.Method according to claim 1,
characterized,
that the first and second colored lacquer layers (4, 5) are transferred from a carrier (1) to the surface (8) in a transfer process. Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
dass auf die erste Farblackschicht (4) vor oder nach der Laserbearbeitung eine transparente Schutzlackschicht (3) aufgebracht wird.The method of claim 1 or 2,
characterized,
that a transparent protective lacquer layer (3) is applied to the first colored lacquer layer (4) before or after the laser processing. Verfahren nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
dass sämtliche Lackschichten (3, 4, 5) mittels einer Transferfolie aufgebracht werden, die einen Trägerfilm (1) und auf diesem ablösbar die Lackschichten (3, 4, 5) aufweist.Method according to one of the preceding claims,
characterized,
that all the lacquer layers (3, 4, 5) are applied by means of a transfer film which has a carrier film (1) and the lacquer layers (3, 4, 5) which can be detached thereon. Verfahren nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
dass mindestens die erste Farblackschicht (4) mittels einer Prägefolie aufgebracht wird.Method according to one of the preceding claims,
characterized,
that at least the first colored lacquer layer (4) is applied by means of an embossing film. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass zur Erzeugung der wenigstens zwei unterschiedlich gefärbten, übereinanderliegenden Farblackschichten (4, 5) eine Prägefolie, insbesondere Heissprägefolie, umfassend einen vorzugsweise aus Polyester bestehenden Trägerfilm (1), auf demaufeinanderfolgend eine Trennschicht (2), gegebenenfalls eine Schutzlackschicht (3), wenigstens zwei unterschiedlich farbige Farblackschichten (4, 5) sowie eine Kleberschicht (6) auf eiber Oberfläche (8) angeordnet sind, verwendet wird.A method according to claim 5, characterized in that for the production of the at least two differently colored, superimposed colored lacquer layers (4, 5) an embossing film, in particular hot stamping film, comprising a carrier film (1) preferably made of polyester, on which a separating layer (2) in succession, if appropriate a protective lacquer layer (3), at least two differently colored colored lacquer layers (4, 5) and an adhesive layer (6) are arranged on the surface (8).
EP92117433A 1991-10-17 1992-10-13 Process for decorating or marking a surface by means of laser radiation and use of a stamping foil in this process Expired - Lifetime EP0537668B2 (en)

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DE102018123473A1 (en) * 2018-09-24 2020-03-26 Leonhard Kurz Stiftung & Co. Kg Decorative film, transfer film, use of a transfer film, process for producing a transfer film, process for decorating a molded plastic part and molded plastic part
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DK0537668T3 (en) 1998-01-12
ATE154550T1 (en) 1997-07-15
EP0537668A3 (en) 1995-01-18
EP0537668B1 (en) 1997-06-18
JP2858513B2 (en) 1999-02-17
ES2104788T5 (en) 2004-09-01
HK1006297A1 (en) 1999-02-19
EP0537668B2 (en) 2004-01-02
DE59208628D1 (en) 1997-07-24
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ES2104788T3 (en) 1997-10-16
US5985078A (en) 1999-11-16

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