EP0537668B1 - 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
EP0537668B1
EP0537668B1 EP92117433A EP92117433A EP0537668B1 EP 0537668 B1 EP0537668 B1 EP 0537668B1 EP 92117433 A EP92117433 A EP 92117433A EP 92117433 A EP92117433 A EP 92117433A EP 0537668 B1 EP0537668 B1 EP 0537668B1
Authority
EP
European Patent Office
Prior art keywords
layer
colored
lacquer layer
colour
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
Other languages
German (de)
English (en)
Other versions
EP0537668B2 (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
Application granted granted Critical
Publication of EP0537668B1 publication Critical patent/EP0537668B1/fr
Publication of EP0537668B2 publication Critical patent/EP0537668B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 layer of colored lacquer facing the viewer is removed in regions by means of the laser radiation to produce the decoration or inscription, 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 generated 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 panel 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 lower lacquer layer which contrasts in color with the upper lacquer layer
  • this upper lacquer layer may not be completely removed in the areas in which it is relatively thick .
  • JP-A-1 (1989) -283.703 describes a method for producing a colored lens, in which a light-impermeable membrane covering the lens and consisting of a plurality of layers of paint or lacquer is provided with a plurality of slits by means of a laser beam , the slits to let light through which the lens is illuminated from the other side.
  • the membrane consisting of several layers can be applied, for example, in a hot stamping process.
  • the laser beam used to generate the slits cuts through all layers of the membrane in any case, so that the actual lens is exposed. On the possibility of only one or more Removing the layers of the membrane is not indicated.
  • 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.
  • the method of the type mentioned at the outset now proposes to proceed in such a way that at least the first color lacquer layer is transferred from a support to the surface to be decorated in a transfer process.
  • layers of colored lacquer can be deposited on a carrier, for example a plastic film or a metal strip, without great effort Apply or have a uniform thickness. If this color lacquer layer is then transferred to the surface to be decorated, it is ensured that the surface to be decorated also has a color lacquer layer 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, in fact only the top or first colored lacquer layer is removed, it being possible to vary the thickness or engraving depth by changing the laser power.
  • a further advantage of the procedure according to the invention can be seen in the fact that it is known that it is possible without difficulty, for example by means of a printing process, to apply lacquer layers only in regions on a flexible carrier, for example a plastic film or a metal strip, 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 and 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 colored lacquer layer 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, for example the first colored lacquer layer on the decorated object can be black, while the second colored lacquer layer 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 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 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.
  • This is, for example, a layer of lacquer correspondingly colored by means of carbon black and having a thickness of approximately 1 to 5 ⁇ m, which can be removed with the aid of a laser beam.
  • 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 parts Hydroxy-functional acrylate (60% in EGA, OH content 6%) 4 parts 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, to 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 created 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. 2b which consists in the fact 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 general procedure will be to remove a small amount of the colored lacquer layer 5 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.
  • 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.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Optics & Photonics (AREA)
  • Toxicology (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Decoration By Transfer Pictures (AREA)
  • Duplication Or Marking (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Laser Beam Processing (AREA)
  • Laminated Bodies (AREA)

Claims (6)

  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, 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) à partir d'un support (1) dans un procédé de transfert.
  2. Procédé suivant la revendication 1, caractérisé en ce que les première et deuxième couches de laque colorée (4, 5) sont transférées d'un support (1) à la surface (8) dans un procédé de transfert.
  3. Procédé suivant l'une des revendications 1 et 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 suivant 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 de transfert qui présente un film de support (1) et, d'une manière détachable sur celui-ci, les couches de laque (3, 4, 5).
  5. Procédé suivant l'une des revendications précédentes, caractérisé en ce qu'au moins la première couche de laque colorée (4) est appliquée au moyen d'une feuille à estamper.
  6. Procédé suivant la revendication 5, caractérisé en ce que, pour la production d'au moins deux couches de laque colorée (4, 5) de teintes différentes, superposées, sur une surface (8), 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
DE4134271 1991-10-17
DE4134271A DE4134271C1 (fr) 1991-10-17 1991-10-17

Publications (4)

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

Cited By (1)

* Cited by examiner, † Cited by third party
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CN116568523A (zh) * 2020-10-16 2023-08-08 艾利丹尼森零售信息服务有限公司 可雕刻热传递标签及装饰

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JPH05305763A (ja) 1993-11-19
US5985078A (en) 1999-11-16
EP0537668B2 (fr) 2004-01-02
JP2858513B2 (ja) 1999-02-17
ES2104788T3 (es) 1997-10-16
DE59208628D1 (de) 1997-07-24
EP0537668A2 (fr) 1993-04-21
DE4134271C1 (fr) 1992-12-24
HK1006297A1 (en) 1999-02-19
DK0537668T3 (da) 1998-01-12
ES2104788T5 (es) 2004-09-01
ATE154550T1 (de) 1997-07-15
EP0537668A3 (fr) 1995-01-18

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