EP0710508A1 - Process for making coatings having three dimensional optical effects - Google Patents

Process for making coatings having three dimensional optical effects Download PDF

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Publication number
EP0710508A1
EP0710508A1 EP95116928A EP95116928A EP0710508A1 EP 0710508 A1 EP0710508 A1 EP 0710508A1 EP 95116928 A EP95116928 A EP 95116928A EP 95116928 A EP95116928 A EP 95116928A EP 0710508 A1 EP0710508 A1 EP 0710508A1
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European Patent Office
Prior art keywords
transfer medium
magnetic
characterized
process according
electromagnet
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German (de)
French (fr)
Inventor
Hans Jürgen Dr. Richter
Ekkehard Dr. Schwab
Raimund Dr. Schmid
Norbert Dr. Mronga
Werner Dr. Ostertag
Helmut Schmidt
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BASF SE
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BASF SE
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Priority to DE19944439455 priority Critical patent/DE4439455A1/en
Priority to DE4439455 priority
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/20Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by magnetic fields
    • B05D3/207Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by magnetic fields post-treatment by magnetic fields
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/06Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
    • B05D5/061Special surface effect
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14Security printing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B44DECORATIVE ARTS
    • B44FSPECIAL DESIGNS OR PICTURES
    • B44F7/00Designs imitating three-dimensional effects

Abstract

The method involves pigments in the coating, which is still liquid, being aligned through the magnetic field of a previously magnetically configured flat transfer medium. This may consist of a plastics film, containing hard magnetic particles, which is applied to an additional carrier. The medium may be a magnetic film or tape. Magnetic configuration of the transfer medium, after its uniform magnetization, can be carried out by using a pen-shaped, one-sided, electric magnet and a soft magnetic base. For configuration, the transfer medium may be located at right angles to the pole shoes.

Description

  • Die vorliegende Erfindung betrifft ein neues Verfahren zur Herstellung von dreidimensionale optische Effekte aufweisenden Beschichtungen durch Ausrichtung magnetisch orientierbarer, plättchenförmiger Pigmente. The present invention relates to a novel process for producing three-dimensional optical effects having coatings by orienting magnetically orientable platelet-shaped pigments.
  • Drucke oder Lackierungen, die dreidimensionale optische Merkmale zeigen, eignen sich nicht nur für dekorative Zwecke, sondern sind vor allem auch von Interesse für die Herstellung fälschungssicherer Materialien, also insbesondere für den Sicherheitsdruck, da sie nicht photokopiert werden können und daher eine leichte Unterscheidung von Original und Fälschung ermöglichen. Prints or finishes that show three-dimensional optical characteristics that are suitable not only for decorative purposes, but are especially of interest for the production of forgery-proof materials, ie in particular for security printing, because they can not be photocopied and therefore easily distinguished from original enable and counterfeiting.
  • Derartige dreidimensionale optische Effekte können vorteilhaft durch Ausrichtung magnetischer, plättchenförmiger Pigmente im noch flüssigen Anwendungsmedium durch den Einfluß eines Magnetfeldes erzeugt und durch anschließende Aushärtung des Anwendungsmediums fixiert werden. Such three-dimensional optical effects can be advantageously generated by alignment of magnetic, platelet-shaped pigments in the still liquid application medium under the influence of a magnetic field and fixed by subsequent curing of the application medium.
  • In der US-A-2 570 856 wird bereits die magnetische Ausrichtung ferromagnetischer Metallpigmente beschrieben, jedoch wird hier kein praktikables Verfahren zur gezielten Herstellung dreidimensionaler Effekte offenbart. In US-A-2570856 the magnetic orientation of ferromagnetic metal pigments is already described, but no practical process for the targeted production of three-dimensional effects is disclosed herein.
  • Aus der DE-A-39 38 055 sind verschiedene Methoden zur Erzeugung dreidimensionaler Muster durch Orientierung von magnetisierbaren, plättchenförmigen Pigmenten, insbesondere von Glimmer- und Aluminiumplättchen, die mit einer magnetischen Schicht belegt sind oder mit magnetischem Material vermischt werden, bekannt. Various methods for producing three-dimensional pattern by orienting magnetisable, platelet-shaped pigments, in particular aluminum flake and mica, which are coated with a magnetic layer or with magnetic material are mixed from DE-A-39 38 055 is known.
  • Eine dieser Methoden besteht darin, daß man durch Stanzen oder Ausschneiden das gewünschte Muster auf eine Mumetallfolie aufbringt, auf diese Folie die auszurichtende Schicht legt und unter der Folie ein Magnetfeld geeigneter Größe erzeugt, wodurch eine Ausrichtung der magnetischen Pigmentteilchen entsprechend dem gewünschten Muster stattfinden soll. One of these methods is that applying by stamping or cutting the desired pattern on a Mumetallfolie, sets are aligning layer on this film and generates a magnetic field of suitable size under the film, whereby an orientation of the magnetic pigment particles is to take place according to the desired pattern. Nachteilig ist hierbei aber, daß über die Mumetallfolie keine optimale, dh vollständige, Feldkonfiguration der Magnetpartikel erreicht wird und daß für jedes Muster eine neue Mumetallfolie präpariert werden muß. The disadvantage here, however, that no optimal, ie full field configuration of the magnetic particles is achieved via the Mumetallfolie and that a new Mumetallfolie must be prepared for each pattern.
  • Nach einer zweiten Methode wird ein Schriftzug direkt durch Entlangfahren eines Permanentmagneten in einen feuchten Druck eingeschrieben. According to a second method, a signature is written directly by travel along a permanent magnet in a wet pressure. Zur bleibenden Ausrichtung der Pigmentteilchen ist jedoch eine gewisse Einwirkzeit des Magnetfeldes, dh eine langsame Bewegung des Magneten, erforderlich, weshalb die Schicht teilweise schon vor der Beendigung des "Schreib"vorgangs angetrocknet ist. For permanent orientation of the pigment particles, however, a certain contact time of the magnetic field, ie, a slow movement of the magnet is required, and therefore the layer is partially dried on operation before the completion of the "write".
  • Bei einer dritten Methode wird eine Magnetfeldbehandlung mit einer UV-Lichtbehandlung zur Aushärtung der Schicht kombiniert. In a third method, a magnetic treatment with a UV-light treatment for curing of the layer is combined. Bei dieser komplizierten Variante wird die feuchte Schicht über eine Photomaske belichtet, dann werden die Pigmentteilchen in den noch feuchten Bereichen magnetisch ausgerichtet, und anschließend wird die ganze Schicht durch UV-Licht ausgehärtet. In this variant, the complicated wet layer is exposed via a photomask, then the pigment particles in the still wet areas are magnetically oriented, and then the whole layer is cured by UV light.
  • Der Erfindung lag die Aufgabe zugrunde, den genannten Mängeln abzuhelfen und ein praktikables Ausrichtverfahren bereitzustellen. The invention had the object of remedying the defects mentioned and to provide a practical alignment.
  • Demgemäß wurde ein Verfahren zur Herstellung von dreidimensionale optische Effekte aufweisenden Beschichtungen durch Ausrichtung magnetisch orientierbarer, plättchenförmiger Pigmente gefunden, welches dadurch gekennzeichnet ist, daß man die Pigmente in der noch flüssigen Beschichtung durch das Magnetfeld eines zuvor magnetisch konfigurierten flächenförmigen Transfermediums ausrichtet. Accordingly, a method for producing three-dimensional optical effects having coatings was found by orienting magnetically orientable platelet-shaped pigments, which is characterized in that in the still liquid coating aligning the pigments by the magnetic field of a previously magnetically configured sheet-like transfer medium.
  • Als magnetisierendes flächenförmiges Transfermedium eignen sich für das erfindungsgemäße Verfahren insbesondere Kunststoffilme, in die hartmagnetische Teilchen eingearbeitet sind, es könnten jedoch auch andere flächenförmige Magnetbauformen verwenden werden. When magnetizing sheet-like transfer medium, in particular plastic films are suitable for the novel process are incorporated into the hard magnetic particles, but there could be other planar magnetic designs will be using.
  • Die Kunststoffilme können auf einen dünnen Träger, zB eine Klebefolie, aufgebracht sein, vorzugsweise handelt es sich jedoch um trägerfreie Materialien, vor allem Magnetfolien bzw. Magnethaftfolien oder Magnetbänder, wie sie allgemein im Handel erhältlich sind. The plastic films can on a thin support eg an adhesive film to be applied, but is preferably is unsupported materials, especially magnetic films or magnetic adhesive sheets or tapes, as they are commonly available commercially. Die Dicke dieser Materialien beträgt in der Regel 0,1 bis 5 mm. The thickness of these materials is 0.1 to 5 mm in general.
  • Die in den Kunststoffilmen enthaltenen hartmagnetischen Teilchen können beispielsweise aus den folgenden hartmagnetischen Werkstoffen bestehen: The hard-magnetic particles contained in the plastic films can for example consist of the following hard magnetic materials:
  • Hartferriten wie Barium- und Strontiumferrit; Hard ferrite such as barium and strontium; Seltenerdlegierungen wie Samarium/Cobalt-Legierungen; Rare earth such as samarium / cobalt alloys; der AlNiCo-Gruppe; the AlNiCo group; Metalloxiden, die für die magnetische Informationsspeicherung verwendet werden, wie Cobalt enthaltendem γ-Eisen(III)oxid, Chromdioxid oder Reineisenteilchen. Metal oxides, which are used for the magnetic storage of information, such as cobalt-containing γ-iron (III) oxide, chromium dioxide or Reineisenteilchen.
  • Typische Abmessungen der hartmagnetischen Teilchen betragen im allgemeinen einige 10 µm bis herab zu 10 bis 20 nm. Typical dimensions of the magnetically hard particles are generally some 10 microns down to 10 to 20 nm.
  • Die Herstellung der Magnetteilchen kann in üblicher Weise, zB durch Sintern oder Schnellabschrecken und anschließende Zerkleinerung, erfolgen. The preparation of the magnetic particles can be done by sintering or rapid quenching and subsequent comminution, in a conventional manner.
  • Die magnetischen Eigenschaften des Transfermediums müssen keinen besonderen Anforderungen genügen, jedoch sind Materialien mit hoher Sättigungsmagnetisierung generell vorteilhaft. The magnetic properties of the transfer medium have to meet any special requirements, however, are materials with high saturation magnetization generally advantageous. Weiterhin ist es von Vorteil, wenn die Koerzitivfeldstärke etwa genauso groß ist wie die Magnetisierung des gesamten Transfermediums, dies ist aber nicht Bedingung. Furthermore, it is advantageous if the coercive force is about the same as the magnetization of the entire transfer medium, but this is not a requirement.
  • Die Dicke des Transfermediums entspricht vorzugsweise dem 0,3 bis 3fachen der in der fertigen Effektbeschichtung gewünschten Auflösung. The thickness of the transfer medium preferably corresponds to 0.3 to 3 times the desired effect in the finished coating resolution.
  • Beim erfindungsgemäßen Verfahren werden die gewünschten dreidimensionalen optischen Effekte über das Magnetfeld des zuvor entsprechend konfigurierten Transfermediums auf die magnetisch orientierbaren plättchenförmigen Pigmente in der noch feuchten Beschichtung (zB Druck oder Lackierung) übertragen. In the present process the desired three-dimensional optical effects on the magnetic field of the above-configured transfer medium according to the magnetically orientable platelet-shaped pigments in the still-wet coating is transferred (eg, printing or coating).
  • Hierbei empfiehlt es sich, das Transfermedium zunächst einheitlich zu magnetisieren, dh alle Magnetteilchen des Transfermediums einheitlich (bevorzugt senkrecht zur Oberfläche des Transfermediums) auszurichten, und so bereits vorhandene Magnetisierungsmuster zu entfernen. In this case, it is advisable to magnetize the transfer medium initially uniform that is, all magnetic particles of the transfer medium (preferably perpendicular to the surface of the transfer medium) align uniformly, and thus removing existing magnetization pattern. Dies geschieht zweckmäßig mit Hilfe eines starken, großflächigen Dauermagneten, zB auf der Basis von Neodym/Eisen/Bor-Legierungen wie Nd₂Fe₁₄B. This is done advantageously with the help of a strong, large-scale permanent magnet, for example, on the basis of neodymium / iron / boron alloys as Nd₂Fe₁₄B.
  • Die anschließende Konfigurierung des Transfermediums, dh die gezielte Ummagnetisierung der Teilmagnete, zum Einschreiben der gewünschten Information bzw. des dreidimensionalen Musters, kann besonders vorteilhaft durch Relativbewegung des Transfermediums entweder zu (zwischen) den Polschuhen eines zweiseitigen Elektromagneten oder zu dem Polschuh eines einseitigen, nur an einer Seite mit einem Polschuh ausgerüsteten, stiftartig ausgeführten Elektromagneten erfolgen. The subsequent configuration of the transfer medium, ie, the targeted reversal of magnetization of the sub-magnets, for writing the desired information or the three-dimensional pattern, can particularly advantageously by relative movement of the transfer medium either at (between) to the pole pieces of a two-side electromagnet or the pole piece of one-sided, only equipped with a pole piece one side, carried electromagnet pin-like executed.
  • Bevorzugte Ausgestaltungen der zweiseitigen und der einseitigen Ausführung sind schematisch in Fig. 1 und Fig. 2 abgebildet. Preferred embodiments of the two-sided and one-sided of the embodiments are shown schematically in FIG. 1 and FIG. 2.
  • Fig. 1 zeigt die bevorzugte senkrechte Anordnung des beweglichen Transfermediums (T) im Spalt eines zweiseitig mit Polschuhen (P) ausgerüsteten Elektromagneten. Fig. 1 shows the preferred vertical arrangement of the moving transfer medium (T) in the gap of a two-sided with pole pieces (P) equipped electromagnet.
  • In Fig. 2 ist die bevorzugte senkrechte Anordnung des wiederum beweglichen Transfermediums (T) zum Polschuh (P) des einseitigen, stiftartig ausgeführten Elektromagneten abgebildet. In FIG. 2, the preferred vertical arrangement of the turn movable transfer medium (T) to the pole (P) of the single-sided pin-like executed electromagnet is depicted. Um den magnetischen Kreis effektiver zu gestalten, empfiehlt es sich, bei der einseitigen Ausführung einen teilweisen magnetischen Rückschluß durch Unterlegen einer weichmagnetischen Platte (W), zB aus Eisen, zu erzeugen. In order to make the magnetic circuit more effectively, it is recommended, in which one-sided embodiment of a partial magnetic flux return by placing a soft magnetic plate (W) to produce, for example, of iron.
  • Selbstverständlich können die Spulen (S) in beiden Fällen an anderen Stellen des Magnetkreises orientiert sein oder ganz oder teilweise durch Permanentmagnete ersetzt sein. Of course, the coils (S) to be oriented in both cases, elsewhere in the magnetic circuit, or be completely or partially replaced by permanent magnets.
  • Um eine gute Auflösung beim Einschreiben zu erreichen, empfiehlt sich, wie bereits in Fig. 1 und Fig. 2 angedeutet, die Verwendung sich verjüngender Polschuhe. In order to achieve a good resolution during the writing, the use of tapered recommended, as already indicated in Fig. 1 and Fig. 2, pole pieces. Der Durchmesser in der Polschuhspitze hängt dabei von der gewünschten Ortsauflösung in der Effektbeschichtung ab und beträgt in der Regel etwa das 0,3 bis 3fache dieser Auflösung. The diameter in the Polschuhspitze depends on the desired spatial resolution in effect coating, and is usually about 0.3 to 3 times that resolution.
  • Die Feldstärke im Spalt des zweiseitigen Elektromagneten bzw. die Feldstärke vor dem Pol des einseitigen Elektromagneten (Stiftes) entspricht bevorzugt der Koerzitivfeldstärke des Transfermediums. The field strength in the gap of the two-side electromagnet or the field strength in front of the pole of the one-side electromagnet (pin) preferably corresponds to the coercive force of the transfer medium.
  • Die zweiseitige Ausführung des Elektromagneten ergibt in der Regel eine bessere Auflösung des eingeschriebenen dreidimensionalen Musters. The two-sided version of the electromagnet generally gives better resolution of the inscribed three-dimensional pattern. Die einseitige, stiftartige Ausführung ist jedoch leichter zu handhaben. The one-sided, pin-like design is, however, easier to handle. Je nach den Anforderungen wird man also der einen oder der anderen Ausführung den Vorzug geben. Depending on the requirements you will be so one way or the other embodiments the preference.
  • Weiterhin bietet es sich an, den Einschreibvorgang (dh die Konfigurierung des Transfermediums) automatisiert mit Hilfe eines Plotters durchzuführen. Furthermore, it lends itself (ie, the configuration of the transfer medium) automated by using a plotter to perform the writing operation. Je nach der Geometrie ist es vorteilhafter, das Transfermedium oder den Magneten (oder beides) beweglich anzuordnen. Depending on the geometry, it is advantageous to arrange the transfer medium or the magnet (or both) movable. Auf diese Weise können Schriftzüge oder Grafiken direkt von einem Computer auf das Transfermedium übertragen werden. In this way, logos or graphics can be transferred directly from a computer to the transfer medium.
  • Zur anschließenden Übertragung der dreidimensionalen Muster auf die Magnetpigment enthaltende Beschichtung bzw. auf das mit den Magnetpigmenten beschichtete (nach den gängigen Methoden bedruckte, lackierte oder bestrichene) Material (zB Folie, Papier, Karton oder (bevorzugt nichtmagnetisches) Metall) wird das konfigurierte Transfermedium möglichst vollständig und gleichmäßig mit der noch feuchten Beschichtung (Druck oder Lackierung), in der die Pigmentteilchen noch beweglich sind, in Kontakt gebracht. For subsequent transmission of the three-dimensional pattern on the magnetic pigment containing coating or the coated magnetic pigments (printed by established methods, painted or coated) material (eg, foil, paper, cardboard or (preferably non-magnetic) metal), the configured transfer medium as possible completely and uniformly with the still wet coating (printing or coating) in which the pigment particles can still be moved, brought into contact. Vorzugsweise wird das beschichtete Material einfach auf das Transfermedium gelegt. Preferably, the coated material is simply placed on the transfer medium.
  • Mit Hilfe des erfindungsgemäßen Verfahrens können alle magnetisch orientierbaren, plättchenförmigen Pigmente einfach und gezielt ausgerichtet werden. With the help of the method, all magnetically orientable platelet-shaped pigments can be aligned easily and systematically. Beispielhaft seien die in der US-A-2 570 856 aufgeführten ferromagnetischen Metallplättchen und die in der DE-A-39 38 055 aufgeführten Glimmer- und Aluminiumplättchen, die mit Magnetit beschichtet sind, sowie die in der DE-A-43 13 541 und der nicht vorveröffentlichten DE-A-43 40 141 beschriebenen Aluminiumplättchen, die mit einer inneren Eisen, Cobalt, Nickel oder γ-Eisen(III)oxid (Maghemit) enthaltenden Schicht, einer weiteren nichtferromagnetischen Metalloxidschicht und/oder einer äußeren passivierenden phosphat-, chromat- und/oder vanadathaltigen Schicht belegt sind, genannt. Examples which may be the ferromagnetic metal platelets and in DE-A-39 mica 38 055 listed and aluminum flakes, are coated with magnetite, as well as in DE-A-43 13541 mentioned in the US-A-2,570,856 and the aluminum flake unpublished DE-a-43 40 141 described, with an inner iron, cobalt, nickel or γ-iron (III) oxide (maghemite) containing layer, a further non-ferromagnetic metal oxide layer and / or an outer passivating phosphate-, chromate - are occupied and / or vanadate-containing layer, called.
  • Besonders hervorzuheben sind die in der nicht vorveröffentlichten DE-A-44 19 173 beschriebenen Aluminiumplättchen, die eine Mehrfachbeschichtung mit (A) Eisen, Cobalt, Nickel, Magnetit und/oder γ-Fe₂O₃, (B) Siliciumoxid und/oder Aluminiumoxid, (C) Metall und/oder nichtselektiv absorbierendem Metalloxid aufweisen. Particularly noteworthy are the in the non-prepublished aluminum platelets described 19 173 DE-A-44, a multi-layer coating comprising (A) iron, cobalt, nickel, magnetite and / or γ-Fe₂O₃, (B) silica and / or alumina, (C ) comprise metal and / or nonselectively absorbing metal oxide. Bei Lackierungen oder Drucken, die diese Pigmente enthalten, werden die dreidimensionalen Effekte nicht nur von dem üblichen Hell/Dunkel-Flop, sondern auch von einem Farbwechsel zwischen den Interferenzfarben begleitet. Where lacquer or printing containing these pigments, the three-dimensional effects are accompanied not only by the usual light / dark flop, but also by a color change between the interference colors.
  • In der Regel betragen die Einwirkzeiten zur Ausrichtung der Pigmentteilchen unabhängig von der Komplexität der Muster nur 1 bis 100 sec. In general, the exposure times for the alignment of the pigment particles be independent of the complexity of the pattern, only 1 to 100 sec.
  • Je nach Art des Beschichtungsmediums (beispielsweise sei hier auf die DE-A-39 38 055 verwiesen) kann der anschließende Trockenvorgang, nach dem die Pigmentteilchen und damit die dreidimensionalen optischen Effekte fixiert sind, durch eine zusätzliche UV-Bestrahlung beschleunigt werden. Depending on the nature of the coating medium (e.g., reference is made to DE-A-39 38 055 here), the subsequent drying process, after which the pigment particles, and thus the three-dimensional optical effects are fixed, are accelerated by an additional UV irradiation.
  • Mit Hilfe des erfindungsgemäßen Verfahrens können dreidimensionale optische Effekte vorteilhaft durch einfache Anpassung der Verfahrensparameter (Polschuhdurchmesser und Feldstärke des Magneten, Kontaktzeit, Dicke und Koerzitivfeldstärke des Transfermediums) sicher und mit der gewünschten (guten) Auflösung, dh mit dem gewünschten Kontrast und der gewünschten Stärke, in magnetisch orientierbare, plättchenförmige Pigmente enthaltenden Beschichtungen wie Drucken oder Lackierungen erzeugt werden. Using the process of the invention can three-dimensional optical effects advantageously by simple adaptation of the process parameters (pole shoe and field strength of the magnet, contact time, thickness and coercive force of the transfer medium) and secure the desired (good) resolution, that is, with the desired contrast and the desired strength containing in magnetically orientable platelet-shaped pigments coatings such as printing or sprays are generated. Das vorliegende Verfahren zeichnet sich aufgrund seines geringen Zeitbedarfs (kurze Einschreibzeiten und kurze Übertragungszeiten), der Wiederverwendbarkeit des Transfermediums, das mit Hilfe eines starken Dauermagneten jederzeit wieder einheitlich magnetisiert werden kann und dann für weitere Einschreibvorgänge erneut zur Verfügung steht, und der Möglichkeit zur Automatisierung durch Computersteuerung insbesondere auch durch seine Wirtschaftlichkeit aus. The present method is distinguished due to its low time requirements (short Einschreibzeiten and short transmission times), the reusability of the transfer medium, which may at any time be magnetized uniformly by means of a strong permanent magnet and is then available for further writing processes again available, and the possibility of automation by computer control especially through his of economy.
  • Beispiele Examples
  • Eine handelsübliche, 1 mm dicke, Bariumferrit enthaltende Magnethaftfolie (Fa. IBS, Berlin) wurde jeweils nach vollständiger Aufmagnetisierung mit einem starken Dauermagneten (Nd₂Fe₁₄B) unter Bewegung mit einer Geschwindigkeit von etwa 1 cm/sec wiederholt mit Hilfe eines zweiseitig mit Polschuhen ausgerüsteten Elektromagneten (Polschuhabstand etwa 1 mm, 2 Spulen mit je 480 Windungen) mit einem Zickzackmuster beschrieben. A commercial, thickness 1 mm, barium ferrite-containing magnetic adhesive sheet (Fa. IBS, Berlin) was in each case after the complete magnetization with a strong permanent magnet (Nd₂Fe₁₄B) with agitation at a speed of about 1 cm / sec is repeated (with the aid of a two-sided equipped with pole pieces electromagnet Polschuhabstand described with a zigzag pattern about 1 mm, 2 coils each having 480 turns).
  • Polschuhdurchmesser und Strom wurden dabei wie in der Tabelle angegeben variiert. Pole shoe and electricity were varies as indicated in the table.
  • Auf die beschriebene Magnetfolie wurde anschließend jeweils für 60 sec ein noch feuchter Siebdruck gelegt. In the described magnetic foil screen printing a wetter was subsequently placed for 60 sec each.
  • Die hierfür benutzten Siebdrucke wurden jeweils durch Verdrucken (49er Sieb) einer Siebdruckfarbe, die 20 g magnetisierbares Pigment (Beispiel 1 der DE-A-43 13 541) in 80 g einer handelsüblichen Bindemittellösung (Copolymerisat auf der Basis von Vinylchlorid und Vinylisobutylether ≙ Laroflex® MP45/Acetat/Aliphaten) auf Papier oder Folie aufgebracht. The used therefor screen prints were each by printing (49er screen) of a screen printing ink containing 20 g of magnetisable pigment (Example 1 of DE-A-43 13 541) in 80 g of a commercially available binder solution (copolymer based on vinyl chloride and vinyl isobutyl ether ≙ Laroflex® MP45 / acetate / aliphatic) applied to paper or foil.
  • Das Zickzackmuster war in allen Fällen im getrockneten Druck deutlich sichtbar und konnte nicht unverändert kopiert werden. The zigzag pattern in all cases was clearly visible in the dried pressure and could not be copied unchanged.
  • Weitere Einzelheiten zu diesen Versuchen sowie deren Ergebnisse können der folgenden Tabelle entnommen werden. Further details of these experiments and their results the following table can be removed. Tabelle table Beispiel example Polschuhdurchmesser [mm] Pole shoe diameter [mm] Strom [A] Current [A] Ergebnis im Druck Result in pressure 1 1 1 1 0,4 0.4 Kontrast und Schärfe hervorragend; Contrast and sharpness excellent; Strichstärke 1 mm Line thickness 1 mm 2 2 0,5 0.5 0,4 0.4 Kontrast und Schärfe gut; Contrast and sharpness good; Strichstärke etwas geringer als 1 mm Line width slightly less than 1 mm 3 3 0,5 0.5 0,8 0.8 Kontrast und Schärfe gut; Contrast and sharpness good; Strichstärke 1,5 mm Line thickness 1.5 mm 4 4 2 2 0,4 0.4 Kontrast und Schärfe gut; Contrast and sharpness good; Strichstärke 2 mm Line thickness 2 mm

Claims (8)

  1. Verfahren zur Herstellung von dreidimensionale optische Effekte aufweisenden Beschichtungen durch Ausrichtung magnetisch orientierbarer, plättchenförmiger Pigmente, dadurch gekennzeichnet, daß man die Pigmente in der noch flüssigen Beschichtung durch das Magnetfeld eines zuvor magnetisch konfigurierten flächenförmigen Transfermediums ausrichtet. A process for producing three-dimensional optical effects having coatings by orienting magnetically orientable platelet-shaped pigments, characterized in that aligning the pigments in the still liquid coating by the magnetic field of a previously magnetically configured sheet-like transfer medium.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man als Transfermedium einen hartmagnetische Teilchen enthaltenden Kunststoffilm, der auf einen zusätzlichen Träger aufgebracht sein kann, verwendet. The method of claim 1, characterized in that a hard magnetic particle-containing plastic film, which may be applied to an additional carrier, is used as transfer medium.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß man als Transfermedium eine Magnetfolie oder ein Magnetband verwendet. A method according to claim 1 or 2, characterized in that there is used as transfer medium is a magnetic foil or a magnetic tape.
  4. Verfahren nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß man die magnetische Konfigurierung des Transfermediums nach dessen einheitlicher Magnetisierung durch Bewegung zwischen den beiden sich verjüngenden Polschuhen eines Elektromagneten vornimmt. Process according to claims 1 to 3, characterized in that one carries out the magnetic configuration of the transfer medium after its uniform magnetization by movement between the two tapering pole pieces of an electromagnet.
  5. Verfahren nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß man die magnetische Konfigurierung des Transfermediums nach dessen einheitlicher Magnetisierung mit einem stiftartig ausgeführten, einseitigen Elektromagneten, gegebenenfalls in Gegenwart einer weichmagnetischen Unterlage, vornimmt. Process according to claims 1 to 3, characterized in that, after its uniform magnetization with a pin-like performed, one-side electromagnet, optionally in the presence of a soft magnetic substrate, making the magnetic configuration of the transfer medium.
  6. Verfahren nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß man das Transfermedium zur Konfigurierung senkrecht zu den Polschuhen anordnet. The method of claim 4 or 5, characterized in that placing the transfer medium for configuring perpendicular to the pole pieces.
  7. Verfahren nach den Ansprüchen 4 bis 6, dadurch gekennzeichnet, daß man einen Polschuhdurchmesser verwendet, der in etwa der Dicke des Transfermediums entspricht. Process according to claims 4 to 6, characterized in that one uses a pole shoe diameter, which roughly corresponds to the thickness of the transfer medium.
  8. Verfahren nach den Ansprüchen 4 bis 7, dadurch gekennzeichnet, daß man eine Feldstärke im Spalt des Elektromagneten verwendet, die in etwa der Koerzitivfeldstärke des Transfermediums entspricht. Process according to claims 4 to 7, characterized in that one uses a field strength in the gap of the electromagnet, which is approximately equal to the coercive force of the transfer medium.
EP95116928A 1994-11-04 1995-10-27 Process for making coatings having three dimensional optical effects Withdrawn EP0710508A1 (en)

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