EP0537668B2 - Procédé pour décorer ou marquer une surface par radiation laser et utilisation d'une feuille à estamper dans ce procédé - Google Patents

Procédé pour décorer ou marquer une surface par radiation laser et utilisation d'une feuille à estamper dans ce procédé Download PDF

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Publication number
EP0537668B2
EP0537668B2 EP92117433A EP92117433A EP0537668B2 EP 0537668 B2 EP0537668 B2 EP 0537668B2 EP 92117433 A EP92117433 A EP 92117433A EP 92117433 A EP92117433 A EP 92117433A EP 0537668 B2 EP0537668 B2 EP 0537668B2
Authority
EP
European Patent Office
Prior art keywords
layer
colour
stamping foil
colored
lacquer
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.)
Expired - Lifetime
Application number
EP92117433A
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German (de)
English (en)
Other versions
EP0537668B1 (fr
EP0537668A2 (fr
EP0537668A3 (fr
Inventor
Joachim Dr. Süss
Gerhard Dr. Zinner
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.)
Leonhard Kurz Stiftung and Co KG
Original Assignee
Leonhard Kurz GmbH and Co KG
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
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Application filed by Leonhard Kurz GmbH and Co KG filed Critical Leonhard Kurz GmbH and Co KG
Publication of EP0537668A2 publication Critical patent/EP0537668A2/fr
Publication of EP0537668A3 publication Critical patent/EP0537668A3/xx
Publication of EP0537668B1 publication Critical patent/EP0537668B1/fr
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Classifications

    • 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 one above the other and then at least the first color coating layer facing the viewer by means of the laser radiation removed to create the decoration or lettering and so the differently colored second color lacquer layer uncovered but not completely removed or removed, with at least the first colored lacquer layer is applied to the surface in a transfer process.
  • the method of the type mentioned is used in particular when it comes to an accurate Inscription or decoration for objects that are individual pieces or only in small quantities be made.
  • the laser beam used to burn out the first colored lacquer layer can, with regard to its Motion path can be controlled very precisely, for example by means of an electron computer, it is also 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.
  • EP-A-0 383 956 also describes a method for producing security markings on a surface known in which an upper layer covered by a laser radiation absorbing layer of color is correspondingly exposed by removing the upper layer by means of a laser beam.
  • an upper layer covered by a laser radiation absorbing layer of color is correspondingly exposed by removing the upper layer by means of a laser beam.
  • the surface to be decorated for example the front panel of a device, by means of usual process is provided with two differently colored layers of paint.
  • the laser beam then turns the Removed the upper layer of lacquer and the according to the desired decoration or pattern or lettering lower layer of paint, which contrasts with the upper layer of paint, is exposed.
  • the problem here is that with conventional lacquer layers there are variations in the thickness of the lacquer layer, with the result that with Burning off the upper layer of lacquer by means of the laser jet under certain circumstances this upper layer of lacquer in the areas in which it is relatively thick, is not completely removed. If you use a higher laser power, you can you can ensure that the upper layer of paint is reliably removed even where it is thicker.
  • JP-A-1 (1989) -283.703 describes a method for producing a colored lens, in which one of the Opaque membrane covering the lens, consisting of several layers of paint or lacquer, by means of a Laser beam is provided with a variety of slits, the slits light with which the lens from the other Side is lit, should let through.
  • the membrane consisting of several layers can, for example be applied in a hot stamping process.
  • the laser beam used to create the slits cuts through in the known method in any case all layers of the membrane so that the actual lens is exposed becomes. The possibility of removing only one or more of the layers of the membrane is not indicated.
  • the aim of the invention is now to propose a method which allows it with comparatively little effort to achieve a perfect decoration or labeling of a surface using laser beam engraving.
  • Another advantage of the procedure according to the invention is that it is known to be without difficulty is possible, e.g. by means of a printing process, on a flexible support, e.g. a plastic film or one Metal tape, layers of paint only to be applied in certain areas, although of course there is also the possibility of different Area of differently colored paints. If one uses one from different colored areas for the decoration of the surface of an object, there are further Design options previously unattainable with reasonable effort. You can, for example, the Divide the decorating surface into different colored areas and then each with a laser beam label. This makes it e.g. possible, certain fonts on the front panel of a device in a different color Execute as the rest of the label to highlight this label or certain operations assigned.
  • first but also the first and the second colored lacquer layer in an embossing process from the carrier film of an embossing film, in particular hot stamping film, to the surface be transferred because of itself then let even greater accuracy be achieved.
  • This procedure is especially useful if the second, lower colored lacquer layer consists of differently colored areas, which for example gives the possibility is given to attach differently colored labels on the front panel of a device, which means under Operation can be made considerably easier under certain circumstances.
  • a transparent protective lacquer layer on the first color lacquer layer before or after laser processing is applied, which has a correspondingly high mechanical strength.
  • Hot stamping foils can be readily used in those known from the manufacture of hot stamping foils Establish process.
  • Stamping foils in particular hot stamping foils for use in the method according to the invention point one above the other at least a first and a second differently colored colored lacquer layer, the first colored lacquer layer is closer to the carrier film than the second.
  • the two layers of colored lacquer are applied according to the desired decorative effect, for example the first colored lacquer layer on the decorated object can be black, while the second color lacquer layer to be exposed by the laser beam, for example is white
  • the properties of the colored lacquer layers can still be adjusted so that the first colored lacquer layer can be removed relatively easily by the laser beam, but otherwise comparatively good mechanical Has strength, while the second color lacquer layer, for example due to its coloring or by additions of the laser beam is attacked as little as possible.
  • a polyester film is expediently used as the carrier film a thickness of 6 to 100 microns, preferably from 19 to 38 microns used. These films have sufficient Strength, but also flexibility to differentiate them as carriers when transferring the decorative layer from the carrier film to be able to use shaped surfaces.
  • To transfer the decorative or colored lacquer layers from the Carriers on the surface to be decorated can use the methods known per se, for example Lifting process, rolling process, or also process in which the corresponding film is placed in an injection mold and then back injected with plastic to form an object, such as the front panel of a device becomes.
  • a clear lacquer layer preferably a thickness of 1 to 2 ⁇ m, can be provided as the protective lacquer layer which, if already present on the embossing foil, are also removed during laser engraving got to. It is advantageous if the second colored lacquer layer of the embossing film is thicker than the first colored lacquer layer, the The thickness of the second colored lacquer layer is preferably approximately 2 to 10 ⁇ m, and the thickness of the first colored lacquer layer is preferred is about 1 to 5 ⁇ m.
  • first colored lacquer layer and one in contrast thicker second color coat gives the ability to remove the first color coat to be able to set the serving laser beam so high that the first layer of colored paint in the desired one is reliable Area completely removed, possibly even a small part of the second color lacquer layer removed is ensured, however, that a sufficiently thick remnant of the second color lacquer layer remains, on the one hand to give a perfect decoration picture, on the other hand a reliable protection of the surface the decorated object is guaranteed by the second layer of colored lacquer.
  • an embossing foil in particular hot stamping foil, comprising a carrier film, preferably made of polyester, on which a separating layer is successively arranged, optionally a protective lacquer layer, at least two differently colored color lacquer layers and an adhesive layer are arranged to produce the at least two differently colored color lacquer layers on one 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 maximum thickness 1 ⁇ m.
  • the protective lacquer layer 3 must therefore be adequately resistant to mechanical influences. She has in present case, for example, a thickness of 1 to 2 microns.
  • Second color lacquer layer 5 Second color lacquer layer 5:
  • This layer is colored differently than the first colored lacquer layer 4, for example when the first colored lacquer layer 4 is black, white or ivory.
  • the color lacquer layers 4 and 5 can be individually - and therefore also different - be composed of different colored areas.
  • Adhesive layer 6 is Adhesive layer 6
  • the adhesive layer also, for example, an adhesive that can be activated by pressure or a layer of a permanently sticky one Material.
  • the carrier film 1 would then have to face away from the lacquer layers 3, 4, 5 Side with a coating, for example silicone, which prevents the adhesive layer 6 from adhering to the carrier film 1, be provided in order to be able to wind up the embossing foil 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 parts Hydroxy-functional acrylate (60% in EGA, OH content 6%) 4 parts Celiulose 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
  • a substrate 7, for example the front panel of a device is shown in partial section, on the surface thereof 8 the lacquer layers 3 to 5 forming a release layer 9 and adhesive layer 6 of the hot stamping foil according to FIG Fig. 1 are attached in a conventional hot stamping process.
  • a corresponding is then used Laser beam to achieve the desired decoration or lettering both the protective lacquer layer 3 as well as the first, in the exemplary embodiment assumed, black colored lacquer layer 4, namely in such a way that at the bottom 10 of the recessed areas 11 formed by removing the layers 3, 4, for example in Form of lines, letters, areas etc., the second one with different colors to the first colored lacquer layer 4 Color layer 5 appears.
  • FIG. 2b the ideal state is shown in FIG. 2b, which consists in that the removal of the lacquer layers by means of the laser beam exactly up to the beginning of the second colored lacquer layer 5 goes.
  • the protective lacquer layer 3 was already on the hot stamping foil is present, which has the consequence that the surface 10 of the second colored lacquer layer 5 in the case of a finished decorated product exposed. 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 has no protective lacquer layer 3 and then to apply a protective lacquer layer after the laser engraving, which then also fills the recessed areas 11. Another possibility that gives better mechanical strength is based on that State according to FIG. 2b additionally apply a further protective lacquer, which may then only be removed Fills areas 11.

Claims (5)

  1. Procédé pour décorer ou marquer une surface (8) par un rayonnement de laser, au moins deux couches de laque colorée différemment teintées (4, 5) étant appliquées l'une au-dessus de l'autre sur la surface (8) et ensuite au moins la première couche de laque colorée (4) tournée vers l'observateur étant enlevée par endroits au moyen du rayonnement de laser pour produire la décoration ou le marquage, et la deuxième couche de laque colorée (5) de teinte différente étant ainsi libérée, mais pas totalement enlevée ou éliminée, au moins la première couche de laque colorée (4) étant transférée sur la surface (8) dans un procédé de transfert, caractérisé en ce que, au moins la première couche de laque colorée (4) est transférée à partir du film de support (1) sur la surface (8) au moyen d'une feuille à estamper, de préférence une feuille à estamper à chaud, comportant la première couche de laque colorée (4) sur un film de support (1).
  2. Procédé selon la revendication 1, caractérisé en ce que la première et la deuxième couche de laque colorée (4, 5) sont transférées, par un procédé d'estampage, à partir du film de support (1) d'une feuille à estamper, en particulier une feuille à estamper à chaud, sur la surface (8).
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce qu'une couche de laque de protection transparente (3) est appliquée sur la première couche de laque colorée (4) avant ou après le traitement au laser.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que la totalité des couches de laque (3, 4, 5) sont appliquées au moyen d'une feuille à estamper, qui présente un film de support (1) et, d'une manière détachable sur celui-ci, les couches de laque (3, 4, 5).
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que, pour la réalisation sur une surface (8) des au moins deux couches de laque colorée (4, 5) de teintes différentes, superposées, on utilise une feuille à estamper, en particulier une feuille à estamper à chaud, comportant un film de support (1), de préférence constitué de polyester, sur lequel sont agencées successivement une couche de séparation (2), éventuellement une couche de laque de protection (3), au moins deux couches de laque colorée (4, 5) de teintes différentes, ainsi qu'une couche d'adhésif (6).
EP92117433A 1991-10-17 1992-10-13 Procédé pour décorer ou marquer une surface par radiation laser et utilisation d'une feuille à estamper dans ce procédé Expired - Lifetime EP0537668B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4134271A DE4134271C1 (fr) 1991-10-17 1991-10-17
DE4134271 1991-10-17

Publications (4)

Publication Number Publication Date
EP0537668A2 EP0537668A2 (fr) 1993-04-21
EP0537668A3 EP0537668A3 (fr) 1995-01-18
EP0537668B1 EP0537668B1 (fr) 1997-06-18
EP0537668B2 true EP0537668B2 (fr) 2004-01-02

Family

ID=6442817

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92117433A Expired - Lifetime EP0537668B2 (fr) 1991-10-17 1992-10-13 Procédé pour décorer ou marquer une surface par radiation laser et utilisation d'une feuille à estamper dans ce procédé

Country Status (8)

Country Link
US (1) US5985078A (fr)
EP (1) EP0537668B2 (fr)
JP (1) JP2858513B2 (fr)
AT (1) ATE154550T1 (fr)
DE (2) DE4134271C1 (fr)
DK (1) DK0537668T3 (fr)
ES (1) ES2104788T5 (fr)
HK (1) HK1006297A1 (fr)

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JPH05305763A (ja) 1993-11-19
JP2858513B2 (ja) 1999-02-17
ES2104788T3 (es) 1997-10-16
EP0537668B1 (fr) 1997-06-18
HK1006297A1 (en) 1999-02-19
DE4134271C1 (fr) 1992-12-24
ES2104788T5 (es) 2004-09-01
DK0537668T3 (da) 1998-01-12
US5985078A (en) 1999-11-16
DE59208628D1 (de) 1997-07-24
EP0537668A2 (fr) 1993-04-21
EP0537668A3 (fr) 1995-01-18

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