EP0688678A1 - One-sheet laser label - Google Patents

One-sheet laser label Download PDF

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Publication number
EP0688678A1
EP0688678A1 EP19950107369 EP95107369A EP0688678A1 EP 0688678 A1 EP0688678 A1 EP 0688678A1 EP 19950107369 EP19950107369 EP 19950107369 EP 95107369 A EP95107369 A EP 95107369A EP 0688678 A1 EP0688678 A1 EP 0688678A1
Authority
EP
European Patent Office
Prior art keywords
layer
label according
laser label
laser
additive
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
EP19950107369
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German (de)
French (fr)
Other versions
EP0688678B1 (en
Inventor
Klaus Dr. Külper
Rolf Hirsch
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Beiersdorf AG
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Beiersdorf AG
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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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/02—Forms or constructions
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/08—Fastening or securing by means not forming part of the material of the label itself
    • G09F3/10—Fastening or securing by means not forming part of the material of the label itself by an adhesive 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
    • 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
    • Y10T428/149—Sectional layer removable
    • Y10T428/1495—Adhesive is on removable 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
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • 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
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y10T428/24851—Intermediate layer is discontinuous or differential
    • Y10T428/24868—Translucent outer layer
    • Y10T428/24876—Intermediate layer contains particulate material [e.g., pigment, etc.]
    • 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
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
    • Y10T428/2839—Web or sheet containing structurally defined element or component and having an adhesive outermost layer with release or antistick coating
    • 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.]

Definitions

  • the invention is a single-layer, self-adhesive, flat gelilde, commonly referred to as labels that can be labeled and labeled with lasers, in particular solid-state or CO2 lasers, the desired contrast between base support and writing by color change with or without minimal material removal is generated.
  • labels also includes signs, foils and the like.
  • the lacquer layers consist of solvent-free, electron beam hardened lacquers which are applied one after the other.
  • the film material obtained is provided with an additional layer of adhesive.
  • the high-quality two- or multi-layer film material is characterized by high temperature, weather and chemical resistance.
  • the top layer can be removed selectively by the laser beam and due to the color contrast to the base layer, a clearly visible inscription (letters, numbers, characters, logos etc.) is created.
  • DE 41 34 271 describes the production of a composite material from two differently colored color lacquer layers, at least the top layer to be lasered being applied in the transfer process.
  • the high achievable layer thickness uniformity is listed here as an advantage.
  • a composite material made of a glass fiber fabric and a black PTFE coating serves as the base material for flexible, temperature and chemical-resistant product labels that can be labeled with a laser.
  • labeling is achieved by removing the upper layer, called the top layer.
  • the top layer With a suitable choice of polymer scaffold materials and the colors / pigmentation of the top and base layers, high contrast and good lettering sharpness can be achieved.
  • the supply of highly concentrated electromagnetic radiation mostly in the infrared range, leads to a material discharge at the point of impact of the laser beam in the form of aerosols.
  • the laser marking area must be vacuumed off and encapsulated if possible;
  • the exhaust air is generally cleaned using particle and absorption filters in order to prevent the environment from being contaminated with toxic cracking and fission products.
  • the object of the invention was to remedy this, in particular to create a simply constructed laser label which does not have the disadvantages of the prior art, or at least does not have it to the extent, but which nevertheless has advantageous application properties.
  • the invention relates to a single-layer laser label, as is characterized in more detail in the claims.
  • Suitable additives are, in particular, color pigments and metal salts, especially copper hydroxide phosphate or also iriodin, a pearlescent pigment such as that from Merck is commercially available. These additives are added to the base polymer (as described, for example, in G 81 30 861), in particular in the order of a few parts per thousand to a maximum of 10 percent. After the production of flat material by known processes such as extrusion, casting, coating, etc., with possibly subsequent radiation-chemical crosslinking, films of this type are coated with self-adhesive compositions which are to be adapted for later use. A cover with siliconized release paper then gives the typical structure for primary material from which labels can be made.
  • Suitable self-adhesive compositions are commercially available, but are also described in the literature, for example in DE-PS 15 69 898.
  • the labeling speed z. T. can be increased significantly.
  • a 5-25 ⁇ m thick top layer had to be evaporated and removed as an aerosol, but this is less for the new labeling process To set energy requirements, which allows an increase in the labeling speed with existing laser power.
  • the invention also shows clear advantages over the prior art in the production of laser-inscribable foils: the elimination of the two-layer structure means that there is no need to produce a (thin) top layer, which has to meet the highest demands regarding uniformity of layer thickness - the production processes can be chosen much more economically and robustly.
  • the bond strength between the base and the The top layer is high: Especially with commercially available security labels, trying to scrape off the top layer leads to the destruction of the overall network. Furthermore, high bond strength is imperative for lasering, if sharp contours and high information densities (e.g. barcodes) are to be achieved: During thermal processing of the material, the top layer flakes off in larger fragments if the interlaminate adhesion is insufficient and leads to frayed contours or destruction of fine lines on barcodes and thus loss of information. With a homogeneous single-layer structure, such problems cannot arise from the outset.
  • the radiation-curing lacquer is produced from 90% of a commercially available polyurethane acrylate and 10% HDDA (that is: hexanediol diacrylate). 0.5% of the additive copper hydroxide phosphate known from DE 3917294 is incorporated with vigorous stirring.
  • the paste is spread evenly on a high-gloss, biaxially stretched polyester film with 60 ⁇ m and cured under an inert gas with an electron beam (EB): After coating with known polyacrylate adhesive in a layer thickness of 25 ⁇ m, the covering is made with commercially available, white silicone paper.
  • the auxiliary carrier (polyester film) is removed on it.
  • the originally transparent film When labeling and marking with an Nd-YAG solid-state laser at a wavelength of 1.06 ⁇ m, the originally transparent film is colored dark gray to anthracite in the area of the laser.
  • the resolution is so large that lettering from a height of 2/10 mm is in focus and can sometimes only be read with the aid of a magnifying glass.
  • the surface of the original film In contrast to the two-layer systems, the surface of the original film is not or only minimally damaged.
  • a high light-dark contrast is especially necessary for the automatic reading of bar codes.
  • a white film can be produced which, in addition to the constituents mentioned in Example 1, also contains up to 40% TiO2 and 10% reactive diluent in order to set a processable viscosity;
  • TiO2 a reactive diluent
  • reactive diluent a reactive diluent in order to set a processable viscosity

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Laminated Bodies (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

Single-layer laser adhesive labels comprises a synthetic substrate layer (A) contg. an additive (B) which exhibits colour change under laser radiation, and which is coated on one side with a self-adhesive material (C) opt. covered with a sepn. paper film (D). The use of (B) in the laser sticker is also claimed.

Description

Bei der Erfindung handelt es sich um einschichtige, selbstklebende, flächige Gelilde, allgemein bezeichnet als Etiketten, die sich mit Lasern, insbesondere Festkörper- oder CO₂-Lasern, beschriften und kennzeichnen lassen, wobei der gewünschte Kontrast zwischen Basisträger und Schrift durch Farbumschlag ohne oder mit minimalem Materialabtrag erzeugt wird. Unter dem Begriff Etiketten sind dabei auch Schilder, Folien und ähnliches zu verstehen.The invention is a single-layer, self-adhesive, flat gelilde, commonly referred to as labels that can be labeled and labeled with lasers, in particular solid-state or CO₂ lasers, the desired contrast between base support and writing by color change with or without minimal material removal is generated. The term labels also includes signs, foils and the like.

Die Beschriftung und Kennzeichnung von Materialien mittels Laser ist weit verbreitet; dabei wird Material abgetragen. Bei einheitlichem Material handelt es sich um Gravieren; wird jedoch eine andersfarbige, dünne Deckschicht abgetragen, so lassen sich kontrastreiche Beschriftungen erzielen, wie bei der Herstellung von Radioblenden in Tag-und-Nacht-Design für Pkws. Analoges ist auch für flächige Gebilde wie Schilder und Etiketten bekannt. Derartige laserbeschriftbare, flächige Materialien zeichnen sich durch einen zwei- oder mehrschichtigen Aufbau aus dünnen Deckschichten und dicken Basisschichten aus, wobei die einzelnen Farbschichten maximale Kontraste aufweisen sollen.The labeling and marking of materials using lasers is widespread; this removes material. Uniform material is engraving; However, if a different-colored, thin top layer is removed, high-contrast lettering can be achieved, as in the production of radio panels in day and night design for cars. The same is also known for flat structures such as signs and labels. Laser-inscribable, flat materials of this type are distinguished by a two- or multi-layer structure consisting of thin cover layers and thick base layers, the individual color layers being intended to have maximum contrasts.

Gemäß DE G 81 30 861 bestehen die Lackschichten aus lösemittelfreien, elektronenstrahlgehärteten Lacken, die nacheinander aufgetragen werden. Das erhaltene Folienmaterial wird mit einer zusätzlichen Kleberschicht versehen. Das hochwertige zwei- oder mehrschichtige Folienmaterial zeichnet sich durch eine hohe Temperatur-, Witterungs- sowie Chemikalienbeständigkeit aus. Durch den Laserstrahl läßt sich die Deckschicht selektiv abtragen und bedingt durch den Farbkontrast zur Basisschicht entsteht eine gut sichtbare Beschriftung (Buchstaben, Zahlen, Zeichen, Logos etc.).According to DE G 81 30 861, the lacquer layers consist of solvent-free, electron beam hardened lacquers which are applied one after the other. The film material obtained is provided with an additional layer of adhesive. The high-quality two- or multi-layer film material is characterized by high temperature, weather and chemical resistance. The top layer can be removed selectively by the laser beam and due to the color contrast to the base layer, a clearly visible inscription (letters, numbers, characters, logos etc.) is created.

In DE 41 34 271 wird die Herstellung eines Verbundmaterials aus zwei unterschiedlich gefärbten Farblackschichten beschrieben, wobei mindestens die zu belasernde Deckschicht im Transferverfahren aufgebracht wird. Als Vorteil wird hier die hohe erreichbare Schichtdickengleichmäßigkeit aufgeführt.DE 41 34 271 describes the production of a composite material from two differently colored color lacquer layers, at least the top layer to be lasered being applied in the transfer process. The high achievable layer thickness uniformity is listed here as an advantage.

In DE 39 25 563 dient ein Verbundmaterial aus einem Glasfasergewebe und einer schwarzen PTFE-Beschichtung als Basismaterial für flexible, temperatur- und chemikalienbeständige Warenetiketten, die sich mittels Laser beschriften lassen.In DE 39 25 563, a composite material made of a glass fiber fabric and a black PTFE coating serves as the base material for flexible, temperature and chemical-resistant product labels that can be labeled with a laser.

Alle der o.g. Mehrschichtsysteme sind durch eine aufwendige Art der Herstellung gekennzeichnet - neben der Herstellung des Basisträgers, meist einer Folie, muß in einem zweiten Arbeitsvorgang eine geeignete, andersfarbige Deckschicht aufgebracht werden. Für reproduzierbare, scharfe Beschriftungsergebnisse sind an die Schichtdickentoleranzen höchste Anforderungen zu stellen, die speziell bei Beschichtungsverfahren wie bei DE G 81 30 861 erheblichen apparativen Aufwand bedeuten und die Produktivität einschränken. Häufig stellt die Interlaminathaftung zwischen den nacheinander aufgetragenen Schichten einen Schwachpunkt dar - nur durch spezielle Herstellungstechniken und/oder Additive in den Rezepturen läßt sich die Verbundfestigkeit derart verbessern, daß das Material auch für hochwertige Anforderungen angewendet werden kann.All of the above multi-layer systems are characterized by an elaborate type of production - in addition to the production of the base support, usually a film, a suitable, differently colored top layer must be applied in a second operation. For reproducible, sharp inscription results, the layer thickness tolerances must meet the highest requirements, which mean considerable expenditure on equipment, particularly in coating processes such as DE G 81 30 861, and limit productivity. Interlaminate adhesion between the successively applied layers is often a weak point - only with special manufacturing techniques and / or additives in the formulations can the bond strength be improved in such a way that that the material can also be used for high-quality requirements.

Bei den oben genannten Zweischichtsystemen wird eine Beschriftung erzielt, indem die obere Schicht, Deckschicht genannt, abgetragen wird. Bei geeigneter Wahl der Polymergerüstwerkstoffe und der Farben/Pigmentierung der Deck- und der Basisschicht lassen sich hoher Kontrast und gute Beschriftungsschärfen erzielen. Die Zufuhr hochkonzentrierter elektromagnetischer Strahlung, meist im infraroten Bereich, führt zu einem Materialaustrag im Auftreffpunkt des Laserstrahls in Form von Aerosolen. Aus Gründen der Arbeitsplatzsicherheit ist der Laserbeschriftungsbereich abzusaugen, möglichst auch zu kapseln; die Abluft wird im Regelfall über Partikel- und Absorptionsfilter gereinigt, um eine Belastung der Umwelt mit ggf. toxischen Crack- und Spaltprodukten zu unterbinden.With the two-layer systems mentioned above, labeling is achieved by removing the upper layer, called the top layer. With a suitable choice of polymer scaffold materials and the colors / pigmentation of the top and base layers, high contrast and good lettering sharpness can be achieved. The supply of highly concentrated electromagnetic radiation, mostly in the infrared range, leads to a material discharge at the point of impact of the laser beam in the form of aerosols. For reasons of job security, the laser marking area must be vacuumed off and encapsulated if possible; The exhaust air is generally cleaned using particle and absorption filters in order to prevent the environment from being contaminated with toxic cracking and fission products.

Aufgabe der Erfindung war es, hier Abhilfe zu schaffen, insbesondere ein einfach aufgebautes Laseretikett zu schaffen, das die Nachteile des Standes der Technik nicht oder zumindest nicht in dem Maße aufweist, das aber dennoch vorteilhafte Anwendungs-Eigenschaften aufweist.The object of the invention was to remedy this, in particular to create a simply constructed laser label which does not have the disadvantages of the prior art, or at least does not have it to the extent, but which nevertheless has advantageous application properties.

Demgemäß betrifft die Erfindung ein Einschichtlaseretikett, wie dies in den Patentansprüchen näher gekennzeichnet ist.Accordingly, the invention relates to a single-layer laser label, as is characterized in more detail in the claims.

Mit derartigen Etiketten lassen sich Ergebnisse bei der Beschriftung und dergleichen mit einem Laser erzielen, wie dies für den Fachmann nicht vorhersehbar war. Insbesondere mit den bisher üblichen Zweischicht-Etiketten sind vergleichbare Ergebnisse nicht erzielbar.With labels of this type, results in the case of inscriptions and the like can be achieved with a laser, as was not foreseeable by the person skilled in the art. Comparable results cannot be achieved, in particular, with the previously used two-layer labels.

Geeignete Additive sind insbesondere Farbpigmente und Metallsalze, vor allem Kupferhydroxidphosphat oder auch Iriodin, ein Perglanzpigment, wie es von der Firma Merck im Handel erhältlich ist. Diese Additive werden dem Basispolymeren (wie z. B. in G 81 30 861 beschrieben) insbesondere in der Größenordnung von einigen Promille bis maximal 10 Prozent zugemischt. Nach Herstellung von flächigem Material durch bekannte Verfahren wie Extrusion, Gießen, Beschichten etc. mit ggf. nachträglicher strahlenchemischer Vernetzung werden derartige Folien mit Selbstklebemassen beschichtet, die den späteren Einsatzzwecken anzupassen sind. Eine Abdeckung mit silikonisiertem Trennpapier ergibt dann den typischen Aufbau für Vormaterial, aus dem sich Etiketten fertigen lassen.Suitable additives are, in particular, color pigments and metal salts, especially copper hydroxide phosphate or also iriodin, a pearlescent pigment such as that from Merck is commercially available. These additives are added to the base polymer (as described, for example, in G 81 30 861), in particular in the order of a few parts per thousand to a maximum of 10 percent. After the production of flat material by known processes such as extrusion, casting, coating, etc., with possibly subsequent radiation-chemical crosslinking, films of this type are coated with self-adhesive compositions which are to be adapted for later use. A cover with siliconized release paper then gives the typical structure for primary material from which labels can be made.

Geeignete Trägerschichten bestehen aus Kunststoffen wie Polyester, Poly-(Meth)acrylate, Polycarbonat und Polyolefine sowie strahlenhärtbaren Systemen wie ungesättigte Polyester, Epoxy-, Polyester- und Urethanacrylate, wie sie auch für UV-Druckfarben Anwendung finden, insbesondere solchen aus einem Basispolymeren gemäß DE G 81 30 816, nämlich aliphatischen Urethanacrylat-Oligomeren.Suitable backing layers consist of plastics such as polyester, poly (meth) acrylates, polycarbonate and polyolefins as well as radiation-curable systems such as unsaturated polyesters, epoxy, polyester and urethane acrylates, as are also used for UV printing inks, especially those made from a base polymer according to DE G 81 30 816, namely aliphatic urethane acrylate oligomers.

Geeignete Selbstklebemassen sind handelsüblich erhältlich, aber auch in der Literatur beschrieben, so in der DE-PS 15 69 898.Suitable self-adhesive compositions are commercially available, but are also described in the literature, for example in DE-PS 15 69 898.

Bei Nutzung der Standardlaser, speziell der weitverbreiteten Nd-YAG-Festkörperlaser mit einer Wellenlänge von 1,06 µm, findet im Auftreffpunkt des Lasers auf die Materialoberfläche eine Farbänderung oder ein Farbumschlag statt und es werden scharfe, kontrastreiche Beschriftungen und Kennzeichnungen erhalten. Neben einer deutlichen Vereinfachung der Folienherstellung ergeben sich als weitere positive Aspekte, daß die Beschriftungsgeschwindigkeit z. T. erheblich gesteigert werden kann. Mußte bisher eine 5-25 µm dicke Deckschicht verdampft und als Aerosol abgetragen werden, so ist für das neue Beschriftungsverfahren ein geringerer Energiebedarf anzusetzten, was bei vorhandener Laserleistung eine Erhöhung der Beschriftungsgeschwindigkeit erlaubt.When using the standard laser, especially the widespread Nd-YAG solid-state laser with a wavelength of 1.06 µm, a color change or a color change takes place at the point of impact of the laser on the material surface and sharp, high-contrast labels and markings are obtained. In addition to a significant simplification of the film production, there are other positive aspects that the labeling speed z. T. can be increased significantly. Previously, a 5-25 µm thick top layer had to be evaporated and removed as an aerosol, but this is less for the new labeling process To set energy requirements, which allows an increase in the labeling speed with existing laser power.

Weiterhin darf nicht außer acht gelassen werden, daß im Vergleich zu dem bisherigen Abtragsverfahren es sich hier um ein ökologisch günstiger zu bewertendes Verfahren zur Beschriftung und Kennzeichnung handelt. Bei dem Standardverfahren wird die Deckschicht als Aerosol (gasförmig, flüssig oder als feste Partikel) abgetragen; wie bei jedem thermischen Verfahren können auch Crackprodukte entstehen. Wegen der Gefährdung durch arbeitsmedizinisch bedenkliche Stoffe (Reizung der Atemwege, lungengängige Feststoffpartikel etc.), ist eine Kapselung mit Absaugung sowie der Einsatz von Spezialfiltern notwendig. Neben notwendigen Investitionskosten bereitet eine fachgerechte Entsorung derartig belasteter Filter zunehmend immer größere Probleme und auch Kosten. Mit der neuen Technologie des Farbumschlages tritt dagegen keine oder nur minimale Emission auf, die die Sicherheitstechnischen Vorkehrungen erheblich geringer ausfallen lassen: Keine Notwendigkeit von Spezialfiltern oder zumindest erheblich verlängerte Wechselzeiten für die Filter.Furthermore, it should not be forgotten that, compared to the previous removal process, this is an ecologically cheaper method for labeling and labeling. In the standard process, the top layer is removed as an aerosol (gaseous, liquid or as solid particles); As with any thermal process, cracked products can also be created. Because of the danger from occupationally harmful substances (irritation of the respiratory tract, respirable solid particles, etc.), encapsulation with suction and the use of special filters are necessary. In addition to the necessary investment costs, the professional disposal of such contaminated filters creates ever greater problems and costs. With the new color change technology, on the other hand, there is no or only minimal emission, which means that the safety precautions are considerably lower: no need for special filters or at least considerably longer change times for the filters.

Auch bei der Herstellung der laserbeschriftbaren Folien zeigt die Erfindung deutliche Vorteile gegenüber dem bisherigen Stand der Technik: Durch den Fortfall des Zweischichtaufbaus entfällt die Fertigung einer (dünnen) Deckschicht, an die gerade höchste Ansprüche bzgl. Gleichmäßigkeit der Schichtdicke zu stellen ist - die Produktionsverfahren können sehr viel ökonomischer und robuster gewählt werden.The invention also shows clear advantages over the prior art in the production of laser-inscribable foils: the elimination of the two-layer structure means that there is no need to produce a (thin) top layer, which has to meet the highest demands regarding uniformity of layer thickness - the production processes can be chosen much more economically and robustly.

Für die meisten Einsatzzwecke muß bei einem Zweischichtetikett die Verbundfestigkeit zwischen der Basis- und der Deckschicht hoch sein: Speziell bei handelsüblichen Sicherheitsetiketten führt der Versuch, die Deckschicht abzukratzen, zur Zerstörung des Gesamtverbundes. Desweiteren ist eine hohe Verbundfestigkeit zwingend notwendig bei der Belaserung, wenn scharfe Konturen und hohe Informationsdichten (z. B. Barcodes) erzielt werden sollen: Bei der thermischen Bearbeitung des Materials platzt die Deckschicht in größeren Bruchstücken ab, wenn die Interlaminathaftung unzureichend ist und führt zu ausgefransten Konturen bzw. Zerstörung von feinen Strichen bei Barcodes und damit zu Informationsverlusten. Bei einem homogenen einschichtigen Aufbau können derartige Probleme von vornherein erst gar nicht auftauchen.For most applications, the bond strength between the base and the The top layer is high: Especially with commercially available security labels, trying to scrape off the top layer leads to the destruction of the overall network. Furthermore, high bond strength is imperative for lasering, if sharp contours and high information densities (e.g. barcodes) are to be achieved: During thermal processing of the material, the top layer flakes off in larger fragments if the interlaminate adhesion is insufficient and leads to frayed contours or destruction of fine lines on barcodes and thus loss of information. With a homogeneous single-layer structure, such problems cannot arise from the outset.

Überraschenderweise wurde bei der Beschriftung von erfindungsgemäßen Etiketten gefunden, daß die Strichbreite, die mit der Belaserung in dem Material erzeugt wird, bei gleichzeitig hoher Konturenschärfe deutlich geringer ist als bei den Zweischichtsystem - dieses eröffnet die Möglichkeiten, auf begrenztem Raum eine größere Anzahl von Informationen unterzubringen und damit dem Trend zur Miniaturisierung zu folgen.Surprisingly, it was found in the labeling of labels according to the invention that the line width which is produced in the material with the lasering, while at the same time having a high contour sharpness, is significantly smaller than in the two-layer system - this opens up the possibility of accommodating a larger amount of information in a limited space and to follow the trend towards miniaturization.

Im folgenden soll die Erfindung anhand von Beispielen erläutert werden, ohne diese allerdings damit unnötig einschränken zu wollen.In the following, the invention will be explained with the aid of examples, but without wishing to restrict it unnecessarily.

Beispiel 1:Example 1:

Entsprechend dem DE G 81 30 861 wird der strahlenhärtende Lack aus 90 % eines handelsüblichen Polyurethanacrylats und 10 % HDDA (das ist: Hexandioldiacrylat) hergestellt. Unter intensivem Rühren werden 0,5 % des aus DE 3917294 bekannten Additiv Kupferhydroxidphosphat eingearbeitet. Die Paste wird auf eine hochglänzende, biaxial gereckte Polyesterfolie gleichmäßig mit 60 µm ausgestrichen und unter Inertgas mit Elektronenstrahl (EB) ausgehärtet: Nach Beschichtung mit bekanntem Polyacrylathaftkleber in einer Schichtdicke von 25 µm erfolgt die Eindeckung mit handelsüblichem, weißem Silikonpapier. Der Hilfsträger (Polyesterfolie) wird darauf entfernt.According to DE G 81 30 861, the radiation-curing lacquer is produced from 90% of a commercially available polyurethane acrylate and 10% HDDA (that is: hexanediol diacrylate). 0.5% of the additive copper hydroxide phosphate known from DE 3917294 is incorporated with vigorous stirring. The paste is spread evenly on a high-gloss, biaxially stretched polyester film with 60 µm and cured under an inert gas with an electron beam (EB): After coating with known polyacrylate adhesive in a layer thickness of 25 µm, the covering is made with commercially available, white silicone paper. The auxiliary carrier (polyester film) is removed on it.

Bei der Beschriftung und Kennzeichnung mit einem Nd-YAG-Festkörperlaser bei der Wellenlänge von 1,06 µm wird die ursprünglich transparente Folie im Bereich der Belaserung dunkelgrau bis anthrazitfarben gefärbt. Die Auflösung ist so groß, daß Schriftzüge ab 2/10 mm Höhe scharf abgebildet werden und teilweise nur noch unter Zuhilfenahme einer Lupe gelesen werden können. Im Gegensatz zu den zweischichtigen Systemen ist hierbei die Oberfläche der Originalfolie nicht oder nur minimal geschädigt.When labeling and marking with an Nd-YAG solid-state laser at a wavelength of 1.06 µm, the originally transparent film is colored dark gray to anthracite in the area of the laser. The resolution is so large that lettering from a height of 2/10 mm is in focus and can sometimes only be read with the aid of a magnifying glass. In contrast to the two-layer systems, the surface of the original film is not or only minimally damaged.

Beispiel 2:Example 2:

Speziell für die automatische Lesung von Barcodierungen ist ein hoher Hell-dunkel-Kontrast notwendig. Dafür läßt sich eine weiße Folie herstellen, die neben den im Beispiel 1 genannten Bestandteilen noch bis zum 40 % TiO₂ und 10 % Reaktivverdünner enthält, um eine verarbeitungsfähige Viskosität einzustellen; bei Zugabe von 5 % Kupferhydroxidphosphat werden Folien erhalten, die bei der Belaserung einen hohen Kontrast zwischen der Folie und Schrift/Balkencodierung aufweisen - eine sichere Lesbarkeit mit automatischen Scannern ist gegeben.A high light-dark contrast is especially necessary for the automatic reading of bar codes. For this purpose, a white film can be produced which, in addition to the constituents mentioned in Example 1, also contains up to 40% TiO₂ and 10% reactive diluent in order to set a processable viscosity; When 5% copper hydroxide phosphate is added, films are obtained which, when lasered, show a high contrast between the film and the text / bar coding - reliable readability with automatic scanners is ensured.

Beispiel 3:Example 3:

Anstelle der hochwertigen, strahlengehärteten Polyurethanacrylatfolien gemäß Beispiel 1 und 2 lassen sich auch selbstklebende Folien entwickeln, die auf Standardkunststoffen mit geeigneten Additiven basieren: Bei der Beschichtung von Folien, die aus dem dotierten Polybutylentherephthalat (PBT - VestodurR X 7060 von Hüls) hergestellt, mit handelsüblichen Haftklebern beschichtet und anschließend mit Silikonpapier eingedeckt werden, ergeben sich Schilder- und Etikettenmaterialien, die bei der Belaserung mit einem Nd-YAG-Festkörperlaser schnell und flexibel gekennzeichnet/beschriftet werden können. Auch hier ermöglicht die hohe Konturenschärfe und geringe Strichbreite eine hohe Informationsdichte. Die Oberfläche wird bei geeigneter Einstellung der Laserparameter nicht oder minimal verändert.Instead of the high-quality, radiation-hardened polyurethane acrylate films according to Examples 1 and 2, self-adhesive films based on standard plastics with suitable additives can also be developed: With the coating of films made from the doped polybutylene terephthalate (PBT - Vestodur R X 7060 from Hüls) commercially available pressure sensitive adhesives are coated and then covered with silicone paper, which results in sign and label materials that can be quickly and flexibly marked / labeled when lasered with an Nd-YAG solid-state laser. Here too, the high sharpness of the contours and the small stroke width enable a high density of information. With a suitable setting of the laser parameters, the surface is not changed or only minimally changed.

Beispiel 4:Example 4:

Werden in die Rezeptur aus Beispiel 2 anstelle des Kupferhydroxidphosphates 5 % des Perlglanzpgimentes IriodinR 100 der Firma Merck eingearbeitet und strahlenchemisch ausgehärtet, so ergeben Beschriftungen mit einem CO₂-Laser bei einer Wellenlänge von 10,6 µm mittelgraue Schriftzüge, die für Markierungen und Kennzeichnungen geeignet sind. Der Kontrast läßt sich verstärken, wenn in der Ausgangsrezeptur der Titandioxidanteil reduziert wird.If, instead of the copper hydroxide phosphate, 5% of the pearlescent Iriodin R 100 from Merck is incorporated into the recipe from Example 2 and cured by radiation chemistry, inscriptions with a CO₂ laser at a wavelength of 10.6 µm result in medium-gray lettering that is suitable for marking and labeling are. The contrast can be increased if the titanium dioxide content is reduced in the starting formulation.

Claims (9)

Einschichtlaseretikett aus einer a) Trägerschicht aus Kunststoff, die b) ein Additiv enthält, das unter Laser-Bestrahlung einen Farbumschlag zeigt, und die c) einseitig mit einer Selbstklebemasse beschichtet ist, welche d) ggf. mit einem Trennpapier oder einer Trennfolie abgedeckt ist. Single-layer laser label from one a) carrier layer made of plastic, the b) contains an additive which shows a color change under laser irradiation, and the c) is coated on one side with a self-adhesive, which d) is covered with a release paper or a release film if necessary. Einschichtlaseretikett nach Anspruch 1, dadurch gekennzeichnet, daß die Trägerschicht aus einem Lack besteht, insbesondere aus einem gehärteten Lack, vorzugsweise einem strahlengehärteten Lack.Single-layer laser label according to claim 1, characterized in that the carrier layer consists of a lacquer, in particular a hardened lacquer, preferably a radiation-hardened lacquer. Einschichtlaseretikett nach Anspruch 1, dadurch gekennzeichnet, daß die Trägerschicht aus einem elektronenstrahlengehärteten Polyurethanacrylat-Lack besteht.Single-layer laser label according to claim 1, characterized in that the carrier layer consists of an electron beam-hardened polyurethane acrylate lacquer. Einschichtlaseretikett nach Anpruch 1, dadurch gekennzeichnet, daß die Trägerschicht aus einem Polybutylenterephthalat besteht.Single-layer laser label according to Claim 1, characterized in that the carrier layer consists of a polybutylene terephthalate. Einschichtlaseretikett nach Anspruch 1, dadurch gekennzeichnet, daß das Additiv ein Pigment, insbesondere Kupferhydroxidphosphat oder Iriodin ist.Single-layer laser label according to claim 1, characterized in that the additive is a pigment, in particular copper hydroxide phosphate or iriodin. Einschichtlaseretikett nach Anspruch 1, dadurch gekennzeichnet, daß das Pigment zusätzlich zu dem Additiv Titandioxid verwendet wird.Single-layer laser label according to claim 1, characterized in that the pigment is used in addition to the additive titanium dioxide. Einschichtlaseretikett nach Anspruch 1, dadurch gekennzeichnet, daß die Trägerschicht eine Dicke von 10 bis 200 µm, insbesondere von 50 bis 100 µm aufweist.Single-layer laser label according to Claim 1, characterized in that the carrier layer has a thickness of 10 to 200 µm, in particular 50 to 100 µm. Einschichtlaseretikett nach Anspruch 1, dadurch gekennzeichnet, daß das Additiv in Mengen von 0,1 bis 10 Gew.%, insbesondere von 0,5 bis 5 Gew.% bezogen auf das Gesamt-Gewicht der Trägerschicht eingesetzt wird.Single-layer laser label according to Claim 1, characterized in that the additive is used in amounts of 0.1 to 10% by weight, in particular 0.5 to 5% by weight, based on the total weight of the carrier layer. Verwendung eines Additivs, das unter Laser-Bestrahlung einen Farbumschlag zeigt, in einem Einschichtlaseretikett nach einem der Ansprüche 1-8.Use of an additive which shows a color change under laser irradiation in a single-layer laser label according to one of Claims 1-8.
EP19950107369 1994-06-22 1995-05-16 One-sheet laser label Expired - Lifetime EP0688678B1 (en)

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US5626966A (en) 1997-05-06

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