DE102017011917A1 - Method for producing a multilayer film security element - Google Patents

Abstract

The invention relates to a method for producing a multilayer film security element for security papers, value documents and other data carriers, in which
a film carrier (22) is provided and provided with a colored motif print (26),
the printed film carrier (22, 26) is provided with an embossing lacquer layer (30), and the embossing lacquer layer (30) is provided with an embossed structure (32),
a soluble washing ink (34) is applied to the embossing lacquer layer (30) in the register complementary to the motif print (26),
- the embossing lacquer layer (30) is coated with the applied wash ink (34) with a metallization coating (38), and
- The coated embossing lacquer layer (30, 38) is subjected to a washing step in which the washing color (34) is washed off with a part or all above the washing paint layer areas by a solvent.

Description

The invention relates to methods for producing a multilayer film security element and relates in particular to the production of a multilayer film security element with a structured metallized embossed structure with recesses, in which the metallized areas of the embossed structure are formed on at least part of the security element at least partially colored.

Data carriers, such as value documents or identity documents, but also other valuables, such as branded articles, are often provided with security elements for securing purposes, which permit a verification of the authenticity of the data carrier and at the same time serve as protection against unauthorized reproduction. Increasingly transparent security features, such as transparent windows in banknotes, are becoming increasingly attractive.

For window production, for example, a film provided with an adhesive layer on one side is applied to a banknote in order to close a through opening previously introduced there. Typically, the film is provided with a security feature such as a hologram or optically variable coating to form a film security element. Double-sided diffractive optical safety elements with recesses are for example from EP 1 476 315 B1 , the EP 1 458 585 B1 , the EP 2 448 766 B1 or the EP 2 448 767 B1 known.

Also known are security films that carry a metallized embossed structure with recesses and in which the metallized areas of the embossed structure are formed on at least one side of the security element at least partially colored. The production of such security films is currently very complicated and requires several exposure steps and very well controlled production conditions.

Based on this, the object of the present invention is to specify simple and cost-effective methods for the production of film security elements of the type mentioned in the introduction.

This object is solved by the features of the independent claims. Further developments of the invention are the subject of the dependent claims.

• - ein Folienträger bereitgestellt und mit einem farbigen Motivdruck versehen wird,
• - der bedruckte Folienträger mit einer Prägelackschicht versehen wird, und die Prägelackschicht mit einer Prägestruktur versehen wird,
• - auf die Prägelackschicht im Register komplementär zu dem Motivdruck eine lösliche Waschfarbe aufgebracht wird,
• - die Prägelackschicht mit der aufgebrachten Waschfarbe mit einer Metallisierungsbeschichtung beschichtet wird, und
• - die beschichtete Prägelackschicht einem Waschschritt unterworfen wird, in dem die Waschfarbe mit zumindest einem Teil der über der Waschfarbe angeordneten Schichtbereiche durch ein Lösungsmittel abgewaschen wird.

The invention first provides a method for producing a multilayer film security element for security papers, value documents and other data carriers, in which

• a film carrier is provided and provided with a colored motif print,
• the printed film carrier is provided with an embossing lacquer layer, and the embossing lacquer layer is provided with an embossing structure,
• a soluble washing ink is applied to the embossing lacquer layer in the register complementary to the motif print,
• - The embossing lacquer layer is coated with the applied wash with a metallizing coating, and
• - The coated embossing lacquer layer is subjected to a washing step in which the washing color is washed off with at least a portion of the above the washing paint layer areas by a solvent.

If several layers or embossings are produced in different printing processes in different printing units of a printing press or in different printing presses, then even with registered application or embossing certain register variations are technically unavoidable. Typical register variations are in the order of 0.1 mm when using various printing / embossing units of a printing press. In a so-called insetter operation, in which an intermediate product is printed / embossed registered in a further machine after printing / embossing in a first machine, the typical register variations are of the order of 0.2 mm.

The statement that the soluble washing ink is applied in the register complementary to the motif print, means that the wash is registered on the one hand applied to the motif print, but this happens in the context of registration accuracy only in areas where there is no motif print. Creative print and wash color are then complementary to each other.

In an advantageous variant of the method, one or more metal layers, for example aluminum, chromium, copper or alloys of these metals, are applied as metallization coating. With particular advantage, a multilayer structure, in particular with a layer sequence of metal 1, dielectric spacer layer, metal 2, can be applied as the metallization coating.

In an advantageous variant, it is provided that the multilayer structure contains an ultrathin dielectric spacer layer having a thickness below 250 nm, in particular between 50 nm and 250 nm, in order to produce a fixed color in reflection and / or transmission. The multilayer structure may also include a thicker dielectric spacer layer having a thickness above 250 nm typically contain a Farbkippender multi-layer structure by interference effects. The multilayer structure can particularly advantageously contain a dielectric spacer layer with locally varying layer thickness in order to generate locally different color impressions (different fixed color impressions and / or different tilt angle-dependent color impressions) in reflection and / or transmission. The dielectric spacer layer of the multi-layer structure may be vapor-deposited like the metal layers, but is advantageously printed.

In an advantageous embodiment, after applying the metallization coating, the film security element is subjected to said washing step, wherein in the washing step the wash color is washed off with the layer regions of the metallization coating arranged above the wash color. In all embodiments, a water-soluble wash can be used and water as the solvent.

In another, likewise advantageous embodiment, the metallization coating is provided before the washing step with a second colored motif print, which is preferably applied in register with the first colored motif print. The film security element is then advantageously subjected to the said washing step after application of the second colored motif print, wherein in the washing step, the wash ink is advantageously washed away with all the wash ink layer regions of the metallization coating and the second colored motif print by a solvent. Alternatively, it can also be provided that the film security element is subjected to the said washing step after application of the second colored motif print, wherein in the washing step the wash ink is washed off only in the regions not provided with the second colored motif print with the layer regions of the metallization coating arranged above the wash ink ,

In an advantageous embodiment, the embossing lacquer layer is provided with an embossed structure in register with the motif print, and the soluble wash ink is registered but applied in a complementary manner to the embossed structure.

In all embodiments, the embossing lacquer layer is advantageously applied over the entire surface. As an embossing pattern, a hologram, a micromirror structure, a microcavity structure, a microlens structure, nanostructures or Fresnel structures, in particular Fresnel concave mirrors or Fresnel mirror mirrors, are embossed into the embossing lacquer layer with advantage.

The film carrier is advantageously pre-printed and the colored motif print is applied to a pressure-pretreated surface of the film carrier.

The first color motif print provided on the film carrier and / or the second color motif print on the metallization coating are advantageously carried out with colored inks, in particular with translucent multicolored inks.

• - ein Folienträger bereitgestellt wird,
• - der Folienträger auf einer Seite mit einer Prägelackschicht versehen und die Prägelackschicht mit einer gewünschten Prägestruktur versehen und metallisiert wird,
• - der Folienträger auf beiden Seiten im Supersimultandruck mit passgenau zueinander angeordneten strukturierten Motivdrucken auf der metallisierten Seite mit ersten Druckfarben und auf der nicht metallisierten Seite mit zweiten Druckfarben versehen wird, wobei die auf der metallisierten Seite aufgebrachten Druckfarben als Resistlack formuliert sind, und
• - in einem Ätzschritt die nicht mit als Resistlack formulierten Druckfarben bedeckten Bereiche der Metallisierung entfernt werden.

The invention also provides a method for producing a multilayer film security element for security papers, value documents and other data carriers, in which

• a film carrier is provided,
• the film carrier is provided on one side with an embossing lacquer layer and the embossing lacquer layer is provided with a desired embossing structure and metallised,
• - The film carrier is provided on both sides in the supersimultaneous with precisely aligned to each other arranged motif prints on the metallized side with first inks and on the non-metallized side with second inks, the applied on the metallized side inks are formulated as a resist, and
• in an etching step, the areas of the metallization which are not covered with printing inks formulated as resist are removed.

The embossed structure of the embossing lacquer layer is preferably metallized over the entire area. As metallization, one or more metal layers, but also multi-layer structures of the type described above into consideration.

The structured motif prints can each be printed with differently colored printing inks, wherein in particular the printing inks applied to the metallized embossing lacquer layer can also be partially colorless.

• - ein Folienträger mit einer auf einer Seite des Folienträgers angeordneten strukturierten Funktionsbeschichtung bereitgestellt wird, die in dieser Reihenfolge eine Prägelackschicht mit gewünschten ersten Prägungen, eine erste Metallisierung, eine optisch trennende Zwischenschicht mit einer zweiten Prägung und eine zweiten Metallisierung enthält,
• - der Folienträger auf der Seite der strukturierten Funktionsbeschichtung oder der der strukturierten Funktionsbeschichtung gegenüberliegenden Seite mit einer farbigen Photoresistschicht in Form eines gewünschten Motivs versehen wird,
• - die farbige Photoresistschicht von der ihr gegenüberliegenden Seite des Folienträgers her belichtet wird, so dass die Metallisierungen der strukturierten Funktionsbeschichtung als Belichtungsmaske wirken, und
• - der belichtete Photoresist entwickelt wird, um zu der strukturierten Funktionsbeschichtung gepasserte Farbbereiche zu erzeugen.

The invention further provides a method for producing a multilayer film security element for security papers, value documents and other data carriers, in which

• a film carrier having a structured functional coating arranged on one side of the film carrier is provided, which in this order contains an embossing lacquer layer with desired first embossings, a first metallization, an optically separating intermediate layer with a second embossing and a second metallization,
• - the film carrier on the side of the structured functional coating or the side opposite the structured functional coating is provided with a colored photoresist layer in the form of a desired motif,
• - The colored photoresist layer is exposed from the opposite side of the film carrier forth, so that the metallizations of the structured functional coating act as an exposure mask, and
• the exposed photoresist is developed to produce color regions matched to the structured functional coating.

The film carrier can be provided after the coating and development of the photoresist on one side in a second step on the other side with a second colored photoresist layer in the form of a desired motif. The second photoresist layer is then also exposed from the opposite side of the film carrier, the metallizations of the structured functional coating acting as an exposure mask. The exposed second photoresist is then developed to produce color regions matched to the patterned functional coating.

The one or more photoresists can be added for coloration in particular with soluble dyes or color pigments.

In all the embodiments described in the application in which photoresist is used, it may be a resist in which the exposed areas remain after development (negative resist) or a resist in which the unexposed areas remain (positive resist) , Thus, in all designs both resist structures can be produced that are congruent with the structures used as the exposure mask, as well as resist structures which are complementary to the structures used as the exposure mask.

Finally, in all designs, a coloration of structured resist material may also be effected by bringing a resist under pressure and / or temperature influence into a sticky state and bringing the sticky resist into contact with a colorant, such as color pigments.

Further exemplary embodiments and advantages of the invention are explained below with reference to the figures, in the representation of which a representation true to scale and proportion has been dispensed with in order to increase the clarity.

• 1 eine schematische Darstellung einer Banknote mit einem erfindungsgemäßen Sicherheitselement in Form eines aufgeklebten Folienstreifens,
• 2 in (a) bis (c) Zwischenschritte bei der Herstellung einer Folie, die als Folienstreifen auf ein Papier mit Loch aufgebracht werden soll,
• 3 in (a) und (b) Zwischenschritte bei der Herstellung einer Folie, die wie in 2 als Folienstreifen auf ein Papier mit Loch aufgebracht werden soll, mit einem abgewandelten Herstellungsverfahren,
• 4 in (a) und (b) Zwischenschritte bei der Herstellung einer Folie, die als Transferstreifen eingesetzt werden kann,
• 5 in (a) und (b) Zwischenschritte bei eine Variante des Verfahrens der 4, bei dem die Metallisierungsbeschichtung als Dreischichtaufbau ausgeführt ist,
• 6 in (a) und (b) Zwischenschritte bei der Herstellung einer Folie, die als Folienstreifen auf ein Substrat mit Durchsichtsfenster aufgebracht werden soll, wobei die Trägerfolie des Sicherheitselements im Produkt verbleiben soll,
• 7 in (a) bis (e) Zwischenschritte bei der Herstellung einer Folie, die zwei voneinander unabhängige metallisierte Prägungen trägt, die von gegenüberliegenden Seiten der Folie her sichtbar sind und die zur Erzeugung von Farbeffekten zusätzlich mit gepasserten Buntfarbschichten versehen sind,
• 8 in (a) bis (e) weitere Herstellungsvarianten von Foliensicherheitselementen, die über einem Durchsichtsfenster aufgebracht werden sollen und bei denen die Trägerfolie des Sicherheitselements im Produkt verbleiben soll, und
• 9 in (a) bis (c) Zwischenschritte bei der Herstellung eines Foliensicherheitselements, das mit Hilfe eines Transferverfahrens mit einer strukturierten farbigen Schicht versehen wird.

Show it:

• 1 a schematic representation of a banknote with a security element according to the invention in the form of a glued foil strip,
• 2 in (a) to (c) Intermediate steps in the production of a film which is to be applied as a film strip to a paper with a hole,
• 3 in (a) and (b) Intermediate steps in the production of a film, as in 2 as a foil strip to be applied to a paper with a hole, with a modified manufacturing method,
• 4 in (a) and (b) Intermediate steps in the production of a film that can be used as a transfer strip,
• 5 in (a) and (b) Intermediate steps in a variant of the method of 4 in which the metallization coating is designed as a three-layer structure,
• 6 in (a) and (b) Intermediate steps in the production of a film which is to be applied as a film strip to a substrate with a transparent window, wherein the carrier film of the security element should remain in the product,
• 7 in (a) to (e) Intermediate steps in the production of a film carrying two independent metallized imprints which are visible from opposite sides of the film and which are additionally provided with matched color layers for the purpose of producing color effects.
• 8 in (a) to (e) Further production variants of film security elements which are to be applied over a see-through window and in which the carrier film of the security element should remain in the product, and
• 9 in (a) to (c) Intermediate steps in the production of a film security element, which is provided by means of a transfer process with a structured colored layer.

The invention will now be explained using the example of security elements for banknotes. 1 shows a schematic representation of a banknote 10 with a security element according to the invention in the form of a glued foil strip 12 , which has a continuous opening 14 covered in banknote paper. In the created banknote window is a colored and at the same time shiny metallic motif 16 visible, which is shown in the embodiment in the form of a maple leaf.

A special feature of the film strip 12 consists in that the motive 16 in the window 14 from the opposite sides of the banknote 10 each metallic shiny, but appears with different colors.

Hereinafter, various manufacturing methods for producing such security elements with a metallic, different from opposite viewing directions color impression will be described in more detail.

Regarding 2 First, the production of a film is described, which is to be applied as a film strip on a paper with a hole, as well as in 1 shown. For producing a foil strip 20 First, a polyester film 22 provided with a thickness between 6 microns and 36 microns. Preferably, the polyester film 22 a thickness of about 12 microns and is for a good adhesion of the applied layers on one side pre-printed (reference numeral 24 ). A desired colored motive print 28 is using inks 26 on the pressure-pretreated side of the polyester film 22 applied, wherein any printing method, such as gravure or flexographic printing, can be used. The printing inks 26 may be aqueous, solvent-based and / or, more preferably, UV-crosslinking. The print can also be multicolored and carried out with several printing units. In this case, intermediate hardening or intermediate drying of first applied printing inks may be required.

On the colored motive print 28 then becomes an embossing lacquer layer 30 printed, wherein the pressure is preferably over the entire surface, so that no special register requirements are placed on the embossing lacquer printing. The embossing lacquer may be a thermoplastic embossing lacquer, however, the use of a UV embossing lacquer is currently preferred. The embossing lacquer layer 30 is with an imprint 32 provided in the embodiment shown in the register to the colored motif print 28 that is, the one with printing inks 26 printed sections. The embossing can be, for example, a hologram, a micromirror structure, a microcavity structure, a microlens structure, nanostructures or Fresnel structures.

Now on the coinage 32 registered complementary, so essentially straight in the unembossed areas of the embossing lacquer layer 30 , a wash 34 imprinted so that the in 2 (a) Layer sequence shown arises. All work steps described so far are done in a single operation, so that a register accuracy of about 0.1 mm can be achieved.

In other embodiments, the embossing 32 also over the colored motive pressure 26 go out or even over the entire embossing lacquer layer 30 extend. It is essential only that the wash 34 in the register complementary to the colored motif print 26 is applied.

Regarding 2 B) Now in a second operation, the embossing lacquer layer 30 and the wash color 34 full surface with a metal layer 38 Provided. Then a second colored motif print 40 with second inks 36 on the metal layer 38 printed. Also the second colored motif print 40 can be multicolored and made with aqueous, solvent-based and / or UV-curing inks. However, the colors of the second motif print differed 40 preferably at least partially of the colors of the first motif print 26 , so that different color impressions arise. The second colored motif print 40 can be registered in an insetter process to the first colored motif print 28 can be printed, with register accuracies of about 0.2 mm can be achieved. The resulting layer sequence is in 2 B) shown.

Now, a washing step is carried out in which the washing color 34 with the overlying areas of the metal layer 38 and the areas of the second printing inks arranged above it 36 is removed, so that in 2 (c) shown situation arises. The washing step will be a perfect registration of the remaining areas 42 the metal layer 38 with the imprint 32 and with the remaining areas 44 the second colored motif print 40 generated.

The result is a foil strip 20 obtained in which a metallized embossed structure 32 . 42 precise registration with a colored first motif print 28 and colored areas 44 a second motif print 40 is arranged. From the top of the foil strip 20 are the color areas 44 visible, from the bottom the color areas 26 , The color areas 26 and 44 are in any case due to the metallized embossed structure 32 . 42 separated.

As in 2 B) and 2 (c) shown, the registration of the color areas 44 to the metallized embossed structure 32 . 42 and thus to the color areas 26 be complete (center of image, reference numeral 45A ), or even just a part of the outline of the color areas 26 extend (left side of the image, reference numeral 45B ). The color areas 44 may be formed in a pattern such as a striped pattern, dot or line patterns, and yet along their outer outlines with the color areas 26 be adapted. Next can also areas without second ink 36 be provided, in which the film strip 20 from the top the purely metallic appearance of the metallized embossed structure 32 . 42 shows (right side of the image, reference numeral 45C ).

In a modification, the second ink 36 also be such that they do not coincide with the metallization during the washing step 38 Will get removed. In particular, in this case, that of the second printing ink 36 covered area always within the coinage 32 lie so that after the washing step colored areas with a metallic edge remain.

Instead of the washing process can for the structuring of the metal layer 38 also an etching process are used, as now with reference to 3 explained. Also in this process variant is first a polyester film 22 provided, which are preferably pre-treated on one side (reference numeral 24 ). Then, a desired colored motif print 28 with printing inks 26 on the pressure-pretreated side of the polyester film 22 imprinted and on this a full-surface embossing lacquer layer 30 printed. The embossing lacquer layer 30 is with an imprint 32 provided in the register for the colored motif print 28 stands, and the embossed lacquer layer 30 eventually becomes full surface with a metal layer 38 Provided.

Then the insetter becomes the coinage 32 a resist varnish 50 and on this a second colored motif print 52 with one or more second colors 54 imprinted so that the in 3 (a) Layer sequence shown arises.

Specifically come for the application of the bright colors 52 several different approaches in question. For example, the bright colors 54 after the resist 50 be printed and good adhesion to the resist 50 but relatively poor resist action on the metal layer 38 demonstrate. In the subsequent etching step, they are not on the resist 50 lying partial areas of the color 54 infiltrated by the etching medium and can be washed off at the latest with the rinsing of the etched foil. In this case, brushes, high-pressure nozzles, rotating felts and the like can be used to assist the detachment. The etching step creates a design as in 3 (b) shown in which the bright colors 54 precisely with the resist 50 are arranged.

The inventors have also recognized that in etching processes at elevated temperature from about 50 ° C, in some cases, a complete loss of adhesion of resist coatings occurs, although the resist effect of the formulations per se is very good. At present, this effect is explained so that some resist coatings, although a good barrier to the liquid etching medium, but do not form a sufficient barrier to gases and the etching medium, which may contain water and alcohols, for example, at temperatures above 50 ° C already a significant vapor pressure developed. Taking advantage of this effect can, with a suitable choice of the bright colors 54 already in a simple etching process supernatant chromatic color together with the metallization 38 be removed from the film. This can be the color 54 both before and after a colorless resist 50 to be printed. Alternatively, the chromatic color 54 themselves constitute a resist, which also results in the desired registration when etching.

In all the described variants, the film 22 be provided on one side with a pressure-receiving layer, which can be applied at any time and advantageous monolayer or with a primer. If, in certain applications, there are no particularly high demands on the mutual registration of chromatic colors and metallization, in the case of printing the ink-accepting layer on the film side, motifs in bright colors can be printed under them. On the opposite side, for example, primers and heat sealing lacquers can be printed. As intermediate layers, in particular bright colors, effect colors and fluorescent colors can be provided. The heat sealing lacquers used can also be provided with fluorescent substances.

4 illustrates the preparation of a film which can be used as a transfer strip and is well suited for example for paper-film composite substrates and polymer substrates. Regarding 4 (a) is used to make a film strip 60 First, a film is provided which enables a reliable release (or a reliable detachment) of the applied layer structure, for example a polyester film 62 good quality without pressure pre-treatment. To provide a uniform, printable surface, the polyester film 62 with a first uniform layer, for example a UV-crosslinking lacquer layer 64 be coated. The desired colored motif print 28 is then printed with inks 26 on the paint layer 64 in principle at 2 already described type printed.

On the motif print 28 is, also analogous to 2 , an embossing lacquer layer 30 imprinted, and these with an imprint 32 provided in the register for the colored motif print 28 that is, the one with printing inks 26 printed sections. In the same operation is on the coinage 32 registered complementary, so just in the unembossed areas of the embossing lacquer layer 30 , Wash color 34 printed.

In the next operation, one or more sputtering steps to produce a metallization coating 66 , wherein the metallization coating 66 in the simplest case, a metal layer, for example an aluminum layer, optionally with chrome plating, or a chromium-aluminum-chromium structure. The metallization coating 66 may also be a multi-layer structure containing not only one or more metal layers but also other types of layers, in particular dielectric spacer layers. For example, the multi-layer structure may be a color-shifting thin-film structure (for example with chromium, SiO ₂ and aluminum), a gold-blue structure (aluminum, SiO ₂ , aluminum), or even a thin-film fixed color consisting of a layer sequence Metall1, ultrathin dielectric with d ≤ 250 nm, metal2. It is understood that the metallization coating 66 can be applied in several steps and that some layers, such as the dielectric layer of a multi-layer structure, can also be printed. After the formation of the metallization coating 66 is the in 4 (a) shown layer sequence before.

Then, a washing step is performed, in which the washing color 34 with the overlying areas of the metallization coating 66 Will get removed. This will be a perfect registration of the remaining areas 68 the metallization coating 66 with the imprint 32 and with the color areas 26 the first motif print 28 generated. Subsequently, a print of primer layers 70 and heat sealing lacquers 72 done so that the in 4 (b) results in layer sequence shown. The metallization coating 66 can in particular produce a color shift effect or a fixed color. The result is a foil strip 60 obtained in which the color effect of the metallization coating 66 exact registration with the colored first motif print 28 is arranged. From the top of the foil strip 60 Here are the remaining areas 68 the metallization coating 66 visible, from the bottom the color areas 26 , The carrier foil 62 can be subtracted again after transferring the layer sequence to a target substrate.

5 (a) shows a representation like 4 (a) for a variant in which the metallization coating 66 as a three-layer structure with a first metallization 74 , a printed dielectric 76 and a second metallization 78 is trained. The dielectric 76 is printed as a motif, whereby the print is as complementary as possible to the wash color print 34 takes place, which can be realized, for example, via an insetter process. Also the layer thickness of the dielectric 76 does not have to be constant, but can be varied locally, as in 5 (a) illustrated by two different layer thicknesses. In this way, thin-film elements with partially different fixed colors and / or different color-shift effects can be realized. The different layer thicknesses can be realized for example by different well geometries in gravure printing. As the pressure of the dielectric 76 Even with different layer thicknesses done with a single cylinder, the areas of different layer thickness and thus the areas with different color effects are perfectly matched to each other. Subsequently, a second metallization 78 applied, made of the same or a different metal than the first metallization 74 can exist.

In the washing step already described then the wash color 34 with the overlying areas of the metallization coating 66 removed and there is a print of primer layers 70 and heat sealing lacquers 72 so that the in 5 (b) results in layer sequence shown. From the top of the foil strip 60 are the remaining areas 68 the metallization coating 66 with their, by the thickness variation of the dielectric layer 76 generated, partially different color effects visible, from the bottom in perfect register to the color areas 26 , The carrier foil 62 can be subtracted again after transferring the layer sequence to a target substrate.

Another variant of the method is in 6 illustrating the production of a film that is a film strip 80 is to be applied to a substrate with see-through window, wherein the carrier film of the security element should remain in the product. With reference to the example of 6 (a) this is a PET carrier film 22 provided on a pressure-pretreated side (reference numeral 24 ) with an embossing lacquer layer 30 with desired embossments 32 was provided. The embossed embossing lacquer layer 30 was then covered with a metal layer 38 metallized.

On the resulting layer sequence was then on both sides in Supersimultandruck a fitted motif print with first inks 82 or second inks 84 applied, wherein the applied to the metallized side printing inks 82 formulated as a resist. These resist inks 82 include one or more vibrant colors 82A , but also colorless printing inks 82B contain, which do not develop any color effect but only serve as a resist. The printing inks 84 on the non-metallized side represented one or more different bright colors.

Then, an etching step is performed, through which the metal layer 38 on the not with resist inks 82 ( 82A . 82B ) covered areas, leaving a perfect registration between the remaining areas 86 the metal layer 38 and the printing inks 82 ( 82A . 82B ) of the metallized side or the printing inks 84 the non metallized side is generated as in 6 (b) shown. The inks present on the opposite sides 82 . 84 in this way are always through a custom-made metal area 86 separated from each other and can produce shiny metallic appearances of different colors from opposite sides. In the places where the ink 82 not by a colored color 82A but by a colorless resist 82B is formed from the top is the purely metallic appearance of the metal layer 38 visible.

Regarding 7 Now, the production of a film will be described, which carries two independent metallized imprints, for example, two reflection holograms, which are visible from opposite sides of the film forth. The metallized embossings are matched exactly to each other, at least in some areas, so that when viewed from one side only exactly one motif is visible. To create additional color effects, the metallized imprints are provided with adjusted color-coordinated layers.

The starting point of the method described is a film structure 100 the in 7 (a) shown type with a PET carrier film 22 , one on a pressure-pretreated side (reference numeral 24 ) applied embossing lacquer layer 30 with desired first imprints 102 , a first metallization 104 , an intermediate layer visually separating the two imprints 106 with a second imprint 108 and a second metallization 110 , Such a film structure can be produced, for example, by a metal transfer process, as described for example in the publications WO 2011/138038 A1 . EP 2 340 175 B1 . EP 2 321 311 B1 or EP 2 874 823 B1 is described. The disclosure of the cited documents is incorporated in the present application in this respect.

In the present case, the film structure of 7 (a) combined with at least one colored layer, which covers a metallization over part of the surface or over the entire surface, but is to be passaged only in those places where there is already a metallization. Regarding 7 (b) becomes a photoresist 112 , which was dyed in the desired manner, on the metallized side of the carrier film 22 applied in the form of a desired motif. For coloring, the resist 112 be mixed with soluble dyes, such as dyes from the Orasol or Neozaponreihe, or with color pigments.

After physical drying and optionally rehydration, the resist becomes 112 from the metallizations 104 . 110 illuminated opposite side (reference numeral 114 ), where the metallizations 104 . 110 act as an exposure mask, so that only arranged in non-metallized portions of the film structure areas of the resist 112 be sufficiently exposed. In this case, the exposure with LED emitters is particularly advantageous since, with low heat input, the moisture required for this step results in a higher proportion in the resist layer 112 remains.

Subsequently, the exposed photoresist 112 removed in a developer solution so that the in 7 (c) shown film structure is formed in which the remaining colored resist areas 116 to the metallized parts 104 . 110 are passed.

The photoresist 112 may alternatively also on the metallized side opposite side 124 the carrier film 22 are applied, the exposure then takes place from the metallized side, so that the metallizations 104 . 110 again act as an exposure mask. The metallized parts 104 . 110 and the post-processed resist resist areas are then on opposite sides of the carrier sheet 22 in front.

Of course it is also possible to use both sides of the carrier foil 22 to be provided with additional structured colored layers. For this purpose, for example, based on the design of the 7 (c) the metallization 104 . 110 opposite side 124 the carrier film 22 with another colored photoresist 118 coated as in 7 (d) shown. The photoresist 118 gets from the side of the metallizations 104 . 110 illuminated (reference numeral 120 ), so that the metallizations act again as an exposure mask. After removal of the exposed photoresist, the in 7 (e) illustrated film construction in which the remaining colored resist areas 122 to the metallized parts 104 . 110 and to the colored resist areas 116 are passed.

In the structuring of the second photoresist 118 is to avoid the first photoresist 116 by the exposure step 120 post-exposed, wash off. For this purpose, for example, instead of an immersion step, a one-sided coating of the film with developer solution and appropriate washing done. Another possibility is to use the photoresist 116 by exposure to a UV emitter, which also causes a significant heat input, nachzubelichten and thus to reduce its solubility. In another possible approach, the photoresist 116 by appropriate dosage the exposure step 120 be exposed so that it dries so much that it does not become soluble by the exposure, while the photoresist 118 , shielded by the intermediate layer structure, becomes soluble. This effect can be achieved by choosing the pigmentation of the two photoresist layers 116 . 118 get supported.

The one-sided or two-sided slide assemblies of 7 (c) or 7 (e) can be provided in the usual way with ink-receiving layers and heat-sealing lacquers or otherwise processed further.

8th illustrates further manufacturing variants of film security elements that are to be applied over a see-through window and in which the carrier film of the security element should remain in the product.

Regarding 8 (a) is used to make a film security element 130 a carrier film 22 with an embossing lacquer layer 30 and an embossed embossed structure 32 provided. On the embossed embossing lacquer layer 30 becomes a wash color 132 printed in the form of a desired motif, and on the embossing lacquer layer 30 opposite side of the carrier film 22 becomes a colored photoresist 134 applied. The washing color 132 contains as filler for example between 1% and 30% titanium dioxide and may contain other UV absorbers.

Now the photoresist 134 from the one with the wash color 132 provided side of the carrier film 22 illuminated (reference numeral 136 ), taking that of the wash color 132 formed motif acts as an exposure mask. Then the photoresist becomes 134 developed, depending on the type of photoresist used 134 either the exposed areas 138 stop, as in the variant of 8 (b) shown (negative resist), or the unexposed areas 140 stop, as in the variant of 8 (d) shown (positive resist).

The one with the wash color 132 provided side of the carrier film 22 is after the exposure of the photoresists 134 provided with a desired coating at any time, for example, coated or vapor-deposited with metals and / or other layers. The wash ink is then removed in a washing process with the overlying parts of the coating. The result is a foil security element 130 in which the areas remaining after the washing step 142 the coating fits exactly to the remaining areas 138 or. 140 of the photoresist 134 are arranged. In the variant with negative resist, the remaining coating areas are 142 congruent with the remaining photoresist areas 138 , as in 8 (c) while in the positive resist variant the remaining coating areas 142 and the remaining photoresist areas 138 are arranged complementary to each other, as in 8 (e) shown.

In the 8th The use of positive or negative resist as described in the present application can also be transferred to the other photoresist designs described in this application so that resist areas that are left standing can be generated which are congruent with the structures used as the exposure mask or complementary to those used as the exposure mask structures are used.

9 describes an embodiment in which a film security element 150 is provided with a structured colored layer by means of a transfer process. Regarding 9 (a) becomes a carrier film 22 provided on one side with an embossing lacquer layer 30 with an embossed structure 32 and a structured metallization 152 is provided. The production of structured metallization 152 can be done for example by means of a washing process or a resist-based etching process, as already described several times above. On the metallization 152 opposite side of the carrier film 22 becomes a colored photoresist 154 applied and by exposure 156 from the metallized side of the carrier film 22 converted into a soluble form. The structured metallization 152 acts as an exposure mask.

The photoresist 154 is developed and thereby structured so that the remaining areas 158 of the photoresist congruent with the patterned metallization 152 are arranged as in 9 (b) shown. The photoresist 154 is chosen so that it becomes sticky under pressure and / or temperature influence and color in different ways 160 can accept. For example, can be achieved by printing on a suitable ribbon that color 160 preferably on the resist 158 is transferred and not on the embossing lacquer 30 , as in 9 (c) shown. Even when brought into contact with pigments, which are present, for example, dry or as a suspension in a suitable solvent, it can be achieved that the pigments on the embossing lacquer 30 just superficially lying down and later easily washed off while sticking to the sticky photoresist 158 attach and also not be detached by the washing step. The bringing into contact can be done with a conventional printing process, such as gravure or flexographic printing and also in motif form.

As a result, a film security element is produced by such a transfer method 150 in which the with color 160 coated resist areas 158 perfectly fitting to the structured metallization 152 are arranged. The further processing of the element can take place in the manner already described above.

LIST OF REFERENCE NUMBERS

10

bill

12

film strips

14

through opening

16

motive

20

film strip

22

polyester film

24

pretreated area

26

printing inks

28

first colored motif print

30

Embossing lacquer layer

32

embossing

34

washable ink

36

printing inks

38

metal layer

40

second colored motif print

42

remaining areas of the metal layer

44

remaining areas of the second motif print

45A, 45B, 45C

different passages

50

resist

52

second colored motif print

54

second bright colors

60

film strips

62

polyester film

64

UV-curing lacquer coating

66

metallization coating

68

remaining areas of the metallization coating

70

primer layers

72

Heat seal lacquers

74

first metallization

76

printed dielectric

78

second metallization

80

film strips

82

first inks

82A

chromatic colors

82B

colorless printing inks

84

second inks

86

remaining areas of the metal layer

100

film structure

102

first imprints

104

first metallization

106

interlayer

108

second coinage

110

second metallization

112

photoresist

114

exposure

116

remaining colored resist areas

118

photoresist

120

exposure

122

remaining colored resist areas

124

opposite side of the carrier film

130

Foil security element

132

washable ink

134

colored photoresist

136

exposure

138

remaining resist areas

140

remaining resist areas

142

remaining areas of the coating

150

Foil security element

152

structured metallization

154

colored photoresist

156

exposure

158

remaining resist areas

160

colour

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 1476315 B1 [0003]
• EP 1458585 B1 [0003]
• EP 2448766 B1 [0003]
• EP 2448767 B1 [0003]
• WO 2011/138038 A1 [0055]
• EP 2340175 B1 [0055]
• EP 2321131 B1 [0055]
• EP 2874823 B1 [0055]

Claims (15)

Method for producing a multilayer film security element for security papers, value documents and other data carriers, in which a film carrier is provided and provided with a colored motif print, the printed film carrier is provided with an embossing lacquer layer, and the embossing lacquer layer is provided with an embossing structure, a soluble washing ink is applied to the embossing lacquer layer in the register complementary to the motif print, - The embossing lacquer layer is coated with the applied wash with a metallizing coating, and - The coated embossing lacquer layer is subjected to a washing step in which the washing color is washed off with at least a portion of the above the washing paint layer areas by a solvent. Method according to Claim 1 , characterized in that one or more metal layers are applied as the metallization coating. Method according to Claim 1 or 2 , characterized in that a multi-layer structure, in particular with a layer sequence Metall1, dielectric spacer layer, Metall2, is applied as the metallization coating. Method according to Claim 3 , characterized in that the multi-layer structure contains an ultrathin dielectric spacer layer with a thickness below 250 nm to represent a fixed color in reflection and / or transmission. Method according to Claim 3 or 4 , characterized in that the multi-layer structure contains a dielectric spacer layer with locally varying layer thickness in order to produce locally different color impressions in reflection and / or transmission. Method according to at least one of Claims 3 to 5 , characterized in that the dielectric spacer layer of the multi-layer structure is printed. Method according to at least one of Claims 1 to 6 , characterized in that the film security element is subjected to the washing step after the application of the metallization coating, in which the wash color is washed off with the layer regions of the metallization coating arranged above the wash ink. Method according to at least one of Claims 1 to 6 , characterized in that the metallization coating is provided before the washing step with a second colored motif print, which is preferably applied in register with the first colored motif print. Method according to Claim 8 , characterized in that the film security element is subjected to a washing step after the application of the second colored motif print, in which the wash color is washed off with all above the wash paint layer regions of the metallization and the second colored motif print by a solvent. Method according to Claim 8 , characterized in that the film security element is subjected to a washing step after the application of the second colored motif print in which the wash ink is washed off only in the areas not provided with the second colored motif print with the layer regions of the metallization coating arranged above the wash ink. Method according to at least one of Claims 1 to 10 , characterized in that the embossing lacquer layer is provided with an embossed structure in register with the motif print, and the soluble wash color is registered but applied in a complementary manner to the embossed structure. Method according to at least one of Claims 1 to 11 , characterized in that the embossing lacquer layer is applied over the entire surface. Method according to at least one of Claims 1 to 12 , characterized in that a hologram, a micromirror structure, a microcavity structure, a microlens structure, nanostructures or Fresnel structures, in particular Fresnel concave mirrors or Fresnel mirror mirrors, are embossed into the embossing lacquer layer as embossing structure. Method according to at least one of Claims 1 to 13 , characterized in that the film carrier is pressure-pretreated and the colored motif print is applied to a pressure-pretreated surface of the film carrier. Method according to at least one of Claims 1 to 14 , characterized in that the first and / or second colored motif printing is done with bright colors, in particular with glazing colors.

Images