EP1567363B1 - Laserbeschriftbare folie - Google Patents

Laserbeschriftbare folie Download PDF

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Publication number
EP1567363B1
EP1567363B1 EP03796055A EP03796055A EP1567363B1 EP 1567363 B1 EP1567363 B1 EP 1567363B1 EP 03796055 A EP03796055 A EP 03796055A EP 03796055 A EP03796055 A EP 03796055A EP 1567363 B1 EP1567363 B1 EP 1567363B1
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EP
European Patent Office
Prior art keywords
laser beam
film
medium
changeable
inscribed
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
EP03796055A
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German (de)
English (en)
French (fr)
Other versions
EP1567363A1 (de
Inventor
Robert KÖSSLINGER
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.)
Schreiner Group GmbH and Co KG
Original Assignee
Schreiner Group 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 Schreiner Group GmbH and Co KG filed Critical Schreiner Group GmbH and Co KG
Publication of EP1567363A1 publication Critical patent/EP1567363A1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/267—Marking of plastic artifacts, e.g. with laser
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14—Security printing

Definitions

  • the present invention relates to laser-writable films, in particular a laser-writable film having at least one permeable to the laser beam, single or multilayer top film, below which at least partially a changeable by the laser beam medium is arranged.
  • the present invention further relates to a method for producing a film which can be labeled with a laser beam, in which a single-layer or multi-layered top film permeable to the laser beam is provided on its underside with a medium which can be changed by a laser beam, and a film lettering method in which a film , which has a changeable by a laser beam medium, is labeled by the laser beam is changed by a medium locally irradiated with a laser beam.
  • a film of the type described above is known inter alia from DE 196 42 040 C1.
  • the film disclosed therein has a plastic film which is permeable to a laser beam and on the underside of which a continuous, thin, metallic layer is vapor-deposited, below which there is a contrast-forming layer.
  • the metallic layer is locally ablated, ie it disappears at the points where the laser beam acts on it. This makes it possible to obtain a contour-sharp inscription which is clearly recognizable to the observer, since at the ablated areas the view of the contrast-forming layer is released, whereas at the non-ablated sites the opaque metallic layer continues to determine the visual impression.
  • Multicolor laser-inscribable films are known from DE 100 50 553 A1. The multi-color is achieved by a complex multi-layer structure, which has different contrast-forming layers, as well as at least two layers of deposited metallizations of different ablation resistance, the latter can be selectively ablated.
  • EP 0 802 064 A1 a laser-writable film is known in which a labeling layer containing metal particles is locally completely removed. This affects the surface quality and chemical resistance of the labeled film.
  • EP 1 190 988 A2 discloses metallic particles which show a color change upon laser action. Writable films are not described in EP 1 190 988 A2.
  • the object of the present invention is to provide a laser-writable film, which also with less effort can be produced at short notice and in small batches. It should be possible while maintaining relatively simple labeling technology over the prior art typefaces similar high quality can be achieved. Furthermore, in terms of color design and appearance of the film high flexibility should be possible. Furthermore, as in the case of conventional laser films, no health-endangering and environmentally damaging emissions are to be caused during labeling. The good immanent protection of the typeface against mechanical and chemical stresses, which conventional laser films offer, should also be guaranteed.
  • a further object of the present invention is to provide a cost-effective production method for such a film as well as a cost-effective laser marking method.
  • this object is achieved by a film which can be labeled with a laser beam and has at least one single-layer or multi-layered top film permeable to the laser beam, below which a medium which can be changed by the laser beam is arranged, at least partially, in a matrix material has incorporated, microscopic metallic particles which impart opacity to the medium and are so destructible by laser action that the medium becomes locally transparent.
  • microscopic are meant in particular particles whose diameter does not significantly exceed in the direction of their greatest extent over 100 microns.
  • the median value of the mass-related particle size distribution of the metallic particles is preferably less than 20 ⁇ m if the diameter in the direction of the greatest particle size is taken as the equivalent diameter of the particle size distribution.
  • the metallic particles impart opacity to the medium that can be changed by the laser beam, but they can be locally destroyed by the action of the laser. Destroying means any change in the particles that produces local transparency. If necessary, subsequently within the particle-containing medium precipitating residues in the form of nanoscale particles of metal or metal compounds do not disturb the visual impression. The presence of the top film prevents the emission of emissions to the environment during the labeling process.
  • a contour-sharp inscription whose visibility and aesthetic design are advantageously created by a contrast layer can be improved, which is arranged below the changeable by the laser beam medium.
  • This may be a layer of printing ink or varnish as well as a film colored in contrast to the laser-changeable medium, preferably through-dyed. Under certain circumstances, further film layers may be arranged under the contrast layer.
  • a colored adhesive layer can also act as a contrast layer.
  • the top film is usually transparent or semi-transparent, to give a view of the laser marking;
  • upper films are also conceivable which, although permeable to the laser beam, are opaque to the observer without auxiliary means. This can be made possible for example by using a laser at the edge or beyond the wavelength range of visible light.
  • an opaque upper film it will be appreciated that a marking of the medium which can be changed by the laser beam is only visible with suitable measures.
  • the top film may be multi-layered with one or more opaque, but laser-transparent, layer (s), and the viewer must remove the opaque layer (s) to mark the remaining transparent or partially transparent layers To recognize top film.
  • the use of radiating readers, which optionally operate outside the wavelength range of visible light, is conceivable.
  • the medium which can be changed by the laser beam can be applied to the underside of the upper film by printing technology.
  • the printing of a dispersion containing the metallic particles brings with it a whole series of advantages compared with the vapor deposition or sputtering of a continuous metal layer.
  • printing can be realized with considerably less technical equipment expenditure than metal vapor deposition or sputtering, as a result of which the production costs for the inscribable film can be kept low. Even small-sized films and small quantities up to very small series of laser-labelable film labels can be produced so economically.
  • the printing brings a much greater scope for design with it.
  • the metal particles consist predominantly of aluminum, whereby the laser-variable medium is given a silver-white appearance, as long as the coloring is not changed by the above-mentioned pigments or dyes.
  • the color appearance can be changed by the design of the top film.
  • Advantageous solutions are, for example, a single-layer, translucent through-dyed top film made of plastic or a multilayer top film with a transparent protective film and a translucent printing varnish in the desired color. For example, if the top film is dyed yellowish, the impression of a gold coloration is achieved for the viewer with the underlying silver-white laser-changeable medium.
  • black particles may be advantageous.
  • black offers excellent color contrast to bright colors in negative lettering
  • black particles absorb a high proportion of the laser light irradiated during the inscription process, so that low laser powers and irradiation times are necessary.
  • the metallic particles are flaky or flake-shaped.
  • the diameter of a particle in the direction of its greatest extent is at least three times as large, but ideally at least one order of magnitude greater than the diameter in the direction of the smallest particle size. Due to the flake shape or flake shape, the ratio between the projection surface and the particle mass is very high even with statistically random particle orientation, resulting in the following advantages: on the one hand, the "attack surface" for the inscribing laser beam is large in relation to the particle volume, so that only low laser powers and -instrahldauern are necessary for labeling. On the other hand, the non-laser-irradiated surfaces receive a high degree of brilliance for the viewer.
  • Such particles can be produced, inter alia, by providing a process foil with a thin metallization, detaching and comminuting the metal layer.
  • the film is coated on its underside self-adhesive to allow easy attachment to a variety of documents.
  • the pressure-sensitive adhesive coating becomes a siliconized or otherwise self-adhesive coated release material covered to improve shelf life and handling properties.
  • the film is designed as a so-called void film to indicate irreversible attempts to replace the film from its mounting location.
  • means are provided on the underside of the upper film, which locally reduce the adhesion between the upper film and the medium which can be changed by the laser beam.
  • the transparent or semi-transparent top film triggers at the points of reduced adhesion, which are thus visible through reflection and refraction effects. If the adhesion-reducing agents are applied in the form of a warning lettering, a well-visible warning is produced, such as a warning message. "Void".
  • the film has safety punches, which form predetermined tear points, and so irreversibly indicate attempts to detach the film from its mounting location.
  • a method for producing a film which can be inscribed with a laser beam in which a single-layer or multilayered upper film which is transparent to the laser beam is provided on its underside with a medium which can be changed by a laser beam, the laser beam being transmitted through the laser beam variable medium in the form of a metallic metallic particle microscopic particles containing dispersion, preferably by printing technology, is applied. It is also conceivable to apply a coating containing metallic particles by rolling, coating, brushing, spraying or dipping. The particles impart opacity to the medium and are so destructible by laser action that the medium becomes locally transparent
  • a film lettering method in which a film having a medium changeable by a laser beam is labeled by locally irradiating the laser beam changeable medium with a laser beam, wherein the medium changeable by the laser beam in having a matrix material incorporated, microscopic metallic particles that impart opacity to the medium and are destroyed by the laser action, so that the medium becomes locally transparent.
  • the medium which can be changed by the laser beam is preferably located below a layer of the film which is permeable to the laser beam.
  • the medium which can be changed by the laser beam is located above all other film layers during the inscription process.
  • films which are particularly simply constructed and to be produced can be laser-marked.
  • simple self-adhesive plastic films can be used for the laser inscription, which have on its surface a labeling field of metallic particles containing ink. This labeling field can also completely cover the film.
  • the opaque inscription layer 2 is applied over the underside of the transparent upper film 1, which consists of thin platelet-shaped metal particles 3, which are embedded in a binder matrix 4.
  • metal particles 3 are aluminum flakes, which are commercially available in particle sizes of about 15 ⁇ m at submicron thicknesses. Viewed through the top film then appears the inscription layer in silver white of high brilliance.
  • the inscription layer 2 In addition to the inscription layer 2, differently colored areas 5a, 5b are provided in the same position in order to give the film a multicolored appearance. Alternatively, however, the inscription layer 2 can also extend over the entire surface of the film. The inscription layer 2 and the areas 5a, 5b are printed on the underside of the top film 1. Including a plastic film 6 is laminated, which, however, may also be omitted under certain circumstances. Via the pressure-sensitive adhesive layer 7, the entire film structure can be adhered to a substrate.
  • the inscription layer 2 represents a medium which can be locally changed by irradiation with a laser beam. At the location of the laser irradiation, the particle structure is permanently destroyed, so that the inscription layer 2 becomes locally transparent. If the laser beam is moved on a path corresponding to the desired inscription above the inscription layer 2, then it just leaves this inscription as a transparent track.
  • labeling is understood to mean primarily the provision of alphanumeric characters, but also the generation of graphic symbols, logos and the like.
  • the contrast between the inscription and the surrounding, unscathed inscription layer 2 can be increased in various ways.
  • the plastic film 6 may be colored in a contrasting color. With transparency of the plastic film 6 and the pressure-sensitive adhesive layer 7, the contrast is generated by the color of the base (not shown) to which the film is adhered.
  • the top film 1 which may be pretreated for example by means of a primer, printed on the underside with the inscription layer 2 and the different colored areas 5a, 5b, whereby a print image according to customer requirements is readily possible by using conventional printing presses.
  • the plastic film 6 is laminated on the inscription layer 2 together with adjacent areas 5a, 5b.
  • the underside of the film is coated with pressure-sensitive adhesive 7.
  • the film shown in FIG. 2 also has a transparent top film 11, a labeling layer 12 containing platelet-shaped metal particles 13, a plastic film 16 and a bottom-side, self-adhesive coating 17.
  • the matrix 14 of the labeling layer 12 contains an additional dye which, together with the silvery-white metal particles 13, gives a colorful metallic color.
  • the plastic film 16 is printed to increase the contrast with black ink 18. The labeling is done as described above. The result is the impression of black writing on metallic-colored background.
  • the film structure shown in Fig. 4 is initially similar to the structure shown in Fig. 3, omitting the printing ink layer 29.
  • On the underside of the top film 31 are so-called voidpumblen part 30, which are applied in the form of a lettering and locally the adhesion between the top film 31 and label layer 32 greatly reduce.
  • the described so-called void effect can also be achieved by using a top film 31 of a material on which the binder matrix 34 of the inscription layer 32 generally adheres poorly, but the underside of which is pre-treated in part over the partial area before printing with the inscription layer 32 in that there is an increased local adhesion between the labeling layer 32 and the upper film 31.
  • the laser marking takes place, as described, by local destruction of the metal particles 33.
  • the plastic film layer 36 serves to stabilize the film structure in order to allow better handling.
  • a film which can be provided by laser inscription with a black and white typeface.
  • the inscription layer 42 printed on the underside of the top film 41 contains black platelet-shaped metal particles 43 embedded in a binder matrix 44. These can be produced, for example, by providing a process film with a thin, continuous black metallization according to the usual method, and then detaching and comminuting it becomes.
  • a white colored plastic film 46 is arranged, which is coated on its underside with pressure-sensitive adhesive 47.
  • the laser inscription can be carried out in the manner described above, with the local destruction of the black particles 43 only low laser powers and irradiation times are required because black particles light in the visible Virtually completely absorb wavelength range, so that the energy input is almost completely used.
  • the inscription layer 42 according to the invention can be applied on a partial surface in terms of printing technology and therefore also with high accuracy, areas with black metal particles 43 and silver-white metal particles can readily be arranged next to one another, which opens additional free spaces for the color design.
  • all the measures described in the above exemplary embodiments for achieving a specific color impression can be combined with one another in a largely arbitrary combination.

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Laminated Bodies (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Laser Surgery Devices (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
EP03796055A 2002-12-03 2003-11-25 Laserbeschriftbare folie Expired - Lifetime EP1567363B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10256470A DE10256470A1 (de) 2002-12-03 2002-12-03 Laserbeschriftbare Folie
DE10256470 2002-12-03
PCT/EP2003/050894 WO2004050380A1 (de) 2002-12-03 2003-11-25 Laserbeschriftbare folie

Publications (2)

Publication Number Publication Date
EP1567363A1 EP1567363A1 (de) 2005-08-31
EP1567363B1 true EP1567363B1 (de) 2007-03-28

Family

ID=32335925

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03796055A Expired - Lifetime EP1567363B1 (de) 2002-12-03 2003-11-25 Laserbeschriftbare folie

Country Status (6)

Country Link
EP (1) EP1567363B1 (es)
AT (1) ATE358026T1 (es)
AU (1) AU2003298321A1 (es)
DE (2) DE10256470A1 (es)
ES (1) ES2285247T3 (es)
WO (1) WO2004050380A1 (es)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3178660A1 (de) 2015-12-07 2017-06-14 Hueck Folien Ges.m.b.H Personalisierbares sicherheitselement
DE102021207161A1 (de) 2021-07-07 2023-01-12 Tesa Se Lösbares Folienlaminat und Verfahren zum Lösen dauerhafter Verklebungen

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005003958A1 (de) * 2005-01-27 2006-08-03 Giesecke & Devrient Gmbh Sicherheitselement und Verfahren zu seiner Herstellung
DE102006036367A1 (de) * 2006-08-02 2008-02-07 Funkwerk Enterprise Communications Gmbh Verfahren zum Beschriften von Gerätegehäusen
FR2918959B1 (fr) * 2007-07-19 2010-12-10 Laselec Procede et dispositif de fabrication d'un manchon autour d'un cable et d'identification d'un cable
DE102007050363A1 (de) * 2007-10-15 2009-04-16 Forschungsinstitut für Pigmente und Lacke e.V. Verfahren zur Lasermarkierung eines Polymermaterials
JP6093935B2 (ja) * 2012-12-13 2017-03-15 容子 中鼻 情報書き込みフィルムおよび試料収納体
KR101391037B1 (ko) * 2013-04-29 2014-04-30 남의조 바코드, 문자, 이미지용 라벨 및 바코드, 문자, 이미지 형성방법
DE102020209557B4 (de) 2019-07-31 2022-01-27 Tesa Se Lösbares Folienlaminat, Verwendung und Verfahren zum Lösen dauerhafter Verklebungen
KR20220042219A (ko) * 2019-09-10 2022-04-04 헬리오소닉 게엠베하 레이저 유도 전사 인쇄 프로세스

Family Cites Families (8)

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Publication number Priority date Publication date Assignee Title
JPS6154989A (ja) * 1984-08-28 1986-03-19 Konishiroku Photo Ind Co Ltd 光学的情報記録媒体
DE19509505C1 (de) * 1995-03-16 1996-01-25 Beiersdorf Ag Mehrschichtiges Etikett
JP3766468B2 (ja) * 1996-04-18 2006-04-12 麒麟麦酒株式会社 レーザ印字用媒体
DE19746998B4 (de) * 1997-10-24 2008-06-05 Tesa Ag Laseretiketten und ihre Verwendung
US6503316B1 (en) * 2000-09-22 2003-01-07 Dmc2 Degussa Metals Catalysts Cerdec Ag Bismuth-containing laser markable compositions and methods of making and using same
DE10050553A1 (de) 2000-10-12 2002-04-25 Schreiner Gmbh & Co Kg Mit einem Laserstrahl beschriftbare Folie
DE20017501U1 (de) 2000-10-12 2000-12-14 Schreiner GmbH & Co. KG, 85764 Oberschleißheim Mit einem Laserstrahl beschriftbare Folie
JP2002254819A (ja) * 2001-03-06 2002-09-11 Ricoh Co Ltd 光情報記録媒体及びその製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3178660A1 (de) 2015-12-07 2017-06-14 Hueck Folien Ges.m.b.H Personalisierbares sicherheitselement
EP3178660B1 (de) 2015-12-07 2019-02-06 Hueck Folien Ges.m.b.H Personalisierbares sicherheitselement
DE102021207161A1 (de) 2021-07-07 2023-01-12 Tesa Se Lösbares Folienlaminat und Verfahren zum Lösen dauerhafter Verklebungen
WO2023280673A1 (de) 2021-07-07 2023-01-12 Tesa Se Lösbares folienlaminat und verfahren zum lösen dauerhafter verklebungen

Also Published As

Publication number Publication date
EP1567363A1 (de) 2005-08-31
WO2004050380A1 (de) 2004-06-17
DE10256470A1 (de) 2004-06-24
ES2285247T3 (es) 2007-11-16
AU2003298321A1 (en) 2004-06-23
ATE358026T1 (de) 2007-04-15
DE50306929D1 (de) 2007-05-10

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