EP1440133A1 - Procede pour fabriquer une pellicule pouvant etre marquee au laser - Google Patents

Procede pour fabriquer une pellicule pouvant etre marquee au laser

Info

Publication number
EP1440133A1
EP1440133A1 EP02796200A EP02796200A EP1440133A1 EP 1440133 A1 EP1440133 A1 EP 1440133A1 EP 02796200 A EP02796200 A EP 02796200A EP 02796200 A EP02796200 A EP 02796200A EP 1440133 A1 EP1440133 A1 EP 1440133A1
Authority
EP
European Patent Office
Prior art keywords
layer
engraving
film
electron
laser
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.)
Granted
Application number
EP02796200A
Other languages
German (de)
English (en)
Other versions
EP1440133B1 (fr
Inventor
Arne Koops
Michael BLÜMEL
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tesa SE
Original Assignee
Tesa SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tesa SE filed Critical Tesa SE
Publication of EP1440133A1 publication Critical patent/EP1440133A1/fr
Application granted granted Critical
Publication of EP1440133B1 publication Critical patent/EP1440133B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/24—Ablative recording, e.g. by burning marks; Spark recording
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/14—Layer or component removable to expose adhesive
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/14—Layer or component removable to expose adhesive
    • Y10T428/1467—Coloring agent
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/14—Layer or component removable to expose adhesive
    • Y10T428/1471—Protective layer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/14—Layer or component removable to expose adhesive
    • Y10T428/1486—Ornamental, decorative, pattern, or indicia
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31551—Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
    • Y10T428/31591—Next to cellulosic

Definitions

  • the invention relates to a method for producing a laser-inscribable film.
  • the applicant produces a multi-layer label that is self-supporting, has a thin, opaque pigmented coating layer over a thick coating layer and is made from an electron-beam-hardened, solvent-free coating.
  • a label is described in DE 81 30 861 Ul.
  • the label is labeled by using a laser to engrave the thinner layer of paint by removing the layer so that the lower, thicker layer of paint becomes visible.
  • the film material has a high resistance due to its chemical structure and the electron beam hardening.
  • the thin layer of lacquer is first applied to a process film or support film (polyester film) and then the thick layer of lacquer is crocheted on. Both layers of paint are polymerized in one operation by electron radiation (80 kGy, 350 kV), so that a highly cross-linked polymer is formed.
  • This laser lacquer film is also equipped with a self-adhesive and is decashed from the support carrier film during final assembly.
  • Claim 19 relates to a multilayer label produced by such a method.
  • an engraving layer which has a UV-curable lacquer is printed on a support carrier film.
  • a base layer is applied over the engraving layer, which has an electron-beam-curable lacquer. Hardening takes place by means of electron radiation.
  • the support carrier film is located “below".
  • the engraving layer of the finished film is exposed, ie it is "on top”.
  • the film produced with the aid of the method according to the invention can be labeled with a laser by removing the engraving layer at the desired locations.
  • the engraving layer is printed, specifically - preferably using a UV flexographic printing process. Printing processes allow a wide range of possibilities with regard to the design of geometries, colors and color arrangements.
  • the UV flexographic printing process can also be used to apply the engraving layer to web-shaped materials and, despite the low price, provides good print quality. This enables considerably larger working widths than the previously known method explained at the beginning.
  • the engraving layer is preferably hardened by means of UV radiation before the base layer is applied. If the base layer (or an optional intermediate layer, see below) is subsequently cured by means of electron radiation, the UV-hardened lacquer is firmly bonded to the electron-beam-hardened lacquer with high interlaminate adhesion.
  • the properties of the laser-inscribable film e.g. a high resistance to mechanical, physical and chemical influences are just as good as with conventional laser foils.
  • the engraving layer is printed over the entire surface.
  • the engraving layer can be monochrome, preferably a strong color contrast to the color of the base layer or an intermediate layer
  • the laser-inscribable film is designed similarly to the conventional multi-layer label.
  • the film can be labeled with the aid of a laser (eg an NdrYAG or a C0 2 laser) by locally removing the engraving layer; If there is a strong color contrast between the engraving layer and the layer underneath, the labeling is particularly easy to read.
  • the engraving layer can also be printed over the entire surface and in multiple colors, since the printing techniques for applying the engraving layer can be handled flexibly. For example, two or more than two contrasting colors can be provided which run in the longitudinal direction of the laser-inscribable film, that is to say in the direction in which the engraving layer is printed.
  • Another example are different contrast colors that are printed in the transverse direction of the film as a repeat at a predetermined distance.
  • labels of different colors can be produced within a set of labels which is cut from the laser-inscribable film.
  • other color patterns of the engraving layer are also possible, right down to individualized markings according to customer requirements, such as logos or specific inscriptions that are provided in the engraving layer.
  • Laser marking can be done by removing the engraving layer as with a single-color engraving layer. With conventional multi-layer labels, multi-color design is only possible with great effort.
  • the engraving layer is partially printed on.
  • One example is an individualizing logo that is printed on the support film in a predetermined color (preferably in strong color contrast to the base layer or intermediate layer) at predetermined intervals. This is technically simpler and less expensive than if the engraving layer is printed over the entire surface and a different colored varnish must be provided at the locations between the individual logos.
  • This method variant is particularly suitable for an embodiment in which, after the engraving layer has been printed on and before the base layer has been applied, an intermediate layer is applied, which preferably has a pigmented electron-beam-curable lacquer.
  • the intermediate layer is preferably in color contrast to the base layer.
  • the base layer is from The intermediate layer is covered, and an engraving layer that is partially printed on it visually stands out from the intermediate layer.
  • the intermediate layer is removed locally, if appropriate together with parts of the engraving layer located at the relevant point. The base layer becomes visible.
  • the electron-beam-curable lacquer is preferably cured in one operation and crosslinked with the engraving layer, both in configurations in which only one base layer is provided and in configurations in which a base layer and an intermediate layer are applied.
  • the energy dose of the electron radiation is preferably in the range from 50 kGy to 150 kGy and the electron energy is preferably in the range from 200 keV to 500 keV.
  • the base layer and / or the optional intermediate layer can be applied by scraping before curing.
  • the engraving layer has at least one tamper-evident feature which enables additional individualization and increases the security against forgery of the laser-inscribable film or a multilayer label cut from it.
  • tamper-evident features are preferably not directly visible, but rather require a more or less large amount of equipment in order to be recognized and thus to provide the tamper evidence.
  • the engraving layer can contain fluorescent dyes in ultraviolet light, which are visible when illuminated with a UV lamp.
  • thermochromic dyes which change color when heated.
  • the engraving layer can have a cationic UV lacquer, which is preferably printed in a low thickness, for example in the range from 1 to 20 g / m 2 and particularly preferably in the range from 3 to 6 g / m 2 . (With a material density of 1 g / cm, 1 g / m 2 corresponds to a thickness of 1 ⁇ m.)
  • the base layer and / or the optional intermediate layer preferably has a pigmented electron-beam-curable polyurethane acrylate lacquer.
  • the thickness of the engraving layer can be in the range from 20 to 500 g / m 2 , preferably in the range from 100 to 160 g / m 2 .
  • An optional intermediate layer is usually thinner than the engraving layer.
  • the support carrier film can have a polyester film, the thickness of which is preferably in the range from 10 to 200 ⁇ m.
  • an adhesive is applied over the base layer, e.g. a pressure sensitive adhesive with a layer thickness in the range from 5 to 70 ⁇ m, preferably 10 to 30 ⁇ m.
  • This adhesive can be covered with a protective layer (e.g. silicone paper).
  • the laser-inscribable film can be produced in strips using the method according to the invention. From this, labels can be cut into the sizes required for the usual applications.
  • the support carrier film can already be removed during the production process, preferably in a final process step. However, it is also conceivable that the support carrier film is only removed by the customer before the label in question is labeled using a laser. If the base layer is provided with an adhesive, the customer can easily attach the label in the place provided.
  • FIG. 1 shows a schematic longitudinal section through a laser-inscribable film produced according to a first embodiment of the method according to the invention, which is still on a support carrier film,
  • FIG. 2 shows a schematic longitudinal section through a label made of a film according to FIG. 1 during an inscription process carried out with the aid of a laser
  • FIG. 3 shows a top view of the labeled label according to FIG. 2,
  • FIG. 4 shows a schematic longitudinal section through a laser-inscribable film produced according to a second embodiment of the method according to the invention, which is oriented here as in FIG. 2, and
  • FIG. 5 shows a plan view of a labeled label made of a film according to FIG. 4.
  • FIG. 1 shows how a laser-inscribable film 1 is produced in accordance with a first exemplary embodiment.
  • a support carrier film 10 serves as the carrier, for which a polyester film with a thickness of 50 ⁇ m (Hostaphan film RN 50, Mitsubishi) is used in the exemplary embodiment.
  • a cationic UV varnish is printed over the entire surface of the support carrier film 10 using a UV flexographic printing process.
  • the engraving layer 11 formed in this way contains a lacquer amount of 3 to 6 g / m 2 , ie the thickness of the engraving layer is approximately 3 to 6 ⁇ m. In the export this varnish is dark pigmented. After printing, the engraving layer 11 is irradiated with ultraviolet light for curing.
  • a base layer 14 made of an electron-beam-curable lacquer (in the exemplary embodiment a white-pigmented polyurethane acrylate lacquer) is then crocheted onto the hardened engraving layer 11.
  • the preferred amount of lacquer is in the range from 100 to 160 g / m 2 , corresponding to a layer thickness of approximately 100 to 160 ⁇ m.
  • the base layer 14 is then irradiated with electrons, the acceleration voltage of the electrons being 350 kV and the energy dose being 80 kGy in the exemplary embodiment.
  • the electron-beam-curable lacquer of the base layer 14 is crosslinked, chemical bonds to the engraving layer 11 being formed at the same time. The result is a mechanically high-quality and chemically very stable material with layers firmly connected to each other.
  • an adhesive is applied to the base layer 14 using a conventional coating method, so that an adhesive layer 16 is formed.
  • the adhesive layer 16 is covered with a silicone paper serving as a protective layer 17.
  • the laser-inscribable film 1 is so large that a number of multi-layer labels can be cut from it.
  • the support carrier film 10 can be removed before cutting, but also after cutting, so that the engraving layer 11 is freely accessible.
  • FIG. 2 shows a multilayer label consisting of the laser-inscribable film 1 after the support carrier film 10 has been removed.
  • the engraving layer 11 is oriented upwards and the protective layer 17 is removed, since the label is glued to an object not shown in FIG. 2.
  • the adhesive layer 16 sticks preferably so strong that the film 1 cannot be detached from the object without being destroyed.
  • the film 1 can be labeled with the aid of a laser beam indicated by an arrow in FIG. 2, which is preferably generated with an Nd: YAG laser or a C0 2 laser.
  • the engraving layer 11 is removed, so that the base layer 14 located underneath is exposed. In this way, an engraved inscription 19 is created, which is particularly clearly visible when the color contrast between the engraving layer 11 (dark in the exemplary embodiment) and the base layer 14 (white in the exemplary embodiment) is great.
  • the film 1 is shown in plan view after labeling.
  • the engraved inscription 19 thus appears as white writing against a dark background which is formed by the part of the engraving layer 11 which has not been removed.
  • FIGS. 4 and 5 A second exemplary embodiment of a method for producing a laser-inscribable film is described with reference to FIGS. 4 and 5.
  • the film is labeled 2 here.
  • a polyester film of 50 ⁇ m thickness (Hostaphan RN 50, Mitsubishi) is used as the support film, onto which several layers are applied and cured in succession. Finally, the support carrier film is removed.
  • FIG. 4 shows the laser-inscribable film 2 designed as a multi-layer label after the support carrier film has been removed in an orientation similar to that in FIG. 2. The individual method steps are explained in more detail below.
  • the support carrier film is partially printed with a cationic UV-curable varnish using a UV flexographic printing process.
  • a partial-surface engraving layer 21 is formed, which can be seen in the upper area of FIG. 4.
  • the UV-curable lacquer is pigmented dark green and in the form of a sweeping logos 28 are applied, see also FIG. 5.
  • the amount of lacquer (based on a full-surface print) is in the range from 3 to 6 g / m 2 .
  • the engraving layer 21 is irradiated with ultraviolet light for curing.
  • an intermediate layer 22 is applied with a doctor blade, which in the exemplary embodiment consists of a black pigmented electron-beam-curable polyurethane acrylate lacquer (quantity of lacquer approximately 13 g / m).
  • the material of the intermediate layer 22 surrounds the parts of the engraving layer 21 which protrude from the support carrier film, so that a largely flat surface 23 is created ("in-mold-embossed" method). The engraving layer 21 is thus virtually cast into the intermediate layer 22, see FIG. 4.
  • a further layer of an electron-beam-curable lacquer is knitted on, namely the base layer 24.
  • the base layer 24 again consists of polyurethane acrylate lacquer and is pigmented white.
  • the amount of lacquer is preferably in the range from 100 to 160 g / m 2 .
  • the base layer 24, the intermediate layer 22 and the engraving layer 21 are then irradiated with electrons from the side of the base layer 24 (80 kGy energy dose at 350 kV in the exemplary embodiment).
  • the base layer 24 and the intermediate layer 22 are hardened and the intermediate layer 22 is crosslinked with the engraving layer 21.
  • an adhesive layer 26 is finally applied (in the exemplary embodiment, a pressure sensitive adhesive with a layer thickness of 20 ⁇ m) and covered with a protective layer (which is not shown in FIG. 4).
  • a pressure sensitive adhesive with a layer thickness of 20 ⁇ m
  • a protective layer which is not shown in FIG. 4.
  • Figure 4 (like Figures 1 and 2) is not to scale.
  • FIG. 5 shows the laser-inscribable film 2 (or a section thereof) in a top view.
  • the engraving layer 21 is designed as a pattern of logos 28, which appear dark green on the black background formed by the intermediate layer 22.
  • the film 2 is individualized by the logos 28.
  • the intermediate layer 22 is removed locally with the aid of a laser until the white base layer 24 appears below it. If a part of a logo 28 is located at a location detected by the laser beam, this area of the engraving layer 21 is also removed. In this way, an engraved inscription 29 is produced, as shown in FIG. 5 (in a color rendering not corresponding to the exemplary embodiment).

Landscapes

  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Laser Beam Processing (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Laminated Bodies (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Of Shaped Articles Made Of Macromolecular Substances (AREA)

Abstract

L'invention concerne un procédé pour fabriquer une pellicule (1) pouvant être marquée au laser, selon lequel une couche de gravure (11) comportant un vernis durcissable aux U.V. est appliquée sur une pellicule support (10). Sur la couche de gravure (11) est appliquée une couche de base (14), qui contient un vernis durcissable au jet électronique. Le durcissage se fait par bombardement électronique.
EP02796200A 2001-08-31 2002-07-10 Procede pour fabriquer une pellicule pouvant etre marquee au laser Expired - Lifetime EP1440133B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10142638 2001-08-31
DE2001142638 DE10142638A1 (de) 2001-08-31 2001-08-31 Verfahren zum Herstellen einer laserbeschriftbaren Folie
PCT/EP2002/007711 WO2003018700A1 (fr) 2001-08-31 2002-07-10 Procede pour fabriquer une pellicule pouvant etre marquee au laser

Publications (2)

Publication Number Publication Date
EP1440133A1 true EP1440133A1 (fr) 2004-07-28
EP1440133B1 EP1440133B1 (fr) 2007-11-21

Family

ID=7697214

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02796200A Expired - Lifetime EP1440133B1 (fr) 2001-08-31 2002-07-10 Procede pour fabriquer une pellicule pouvant etre marquee au laser

Country Status (8)

Country Link
US (1) US7438963B2 (fr)
EP (1) EP1440133B1 (fr)
JP (1) JP2005501162A (fr)
CN (1) CN1272753C (fr)
CA (1) CA2454909C (fr)
DE (2) DE10142638A1 (fr)
ES (1) ES2295444T3 (fr)
WO (1) WO2003018700A1 (fr)

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JP2008026054A (ja) * 2006-07-19 2008-02-07 Seiko Instruments Inc 識別コード表示用テープ
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CN109153893B (zh) 2016-04-12 2021-09-17 株式会社Lg化学 多层标记膜和多层标记膜的制造方法
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DE102017223464A1 (de) * 2017-12-20 2019-06-27 Tesa Se Temperaturbeständige laserbeschriftbare Folie
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JP2020015257A (ja) * 2018-07-26 2020-01-30 アズビル株式会社 ラベル製造方法及びラベル
CN109493719B (zh) * 2019-01-05 2021-08-17 北京逸智联科技有限公司 一种不干胶标签制作设备
CN110525112A (zh) * 2019-09-02 2019-12-03 尹锋 一种触摸式图画载体
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Also Published As

Publication number Publication date
EP1440133B1 (fr) 2007-11-21
WO2003018700A1 (fr) 2003-03-06
CN1272753C (zh) 2006-08-30
CA2454909A1 (fr) 2003-03-06
US20040209086A1 (en) 2004-10-21
CA2454909C (fr) 2010-09-21
CN1545542A (zh) 2004-11-10
US7438963B2 (en) 2008-10-21
DE50211261D1 (de) 2008-01-03
ES2295444T3 (es) 2008-04-16
DE10142638A1 (de) 2003-05-08
JP2005501162A (ja) 2005-01-13

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