DE102009031387A1 - Security element and manufacturing method therefor - Google Patents

Abstract

The invention relates to a security element for security papers, documents of value or the like, with a carrier (3) having an upper side (4) and an underside (7) of an upper embossing lacquer layer attached to the upper side (4) in which an upper embossing structure is formed , a lower embossing lacquer layer attached to the underside (4) and in which a lower embossing structure is formed, an upper reflective layer being arranged between the upper side (4) of the carrier and the upper embossing lacquer layer.

Description

The The invention relates to a security element for security papers, Value documents or the like, with a top and bottom having at least partially transparent carrier or translucent, one attached to the top, upper Embossing lacquer layer in which an upper embossed structure is formed, one mounted on the bottom, lower Embossing lacquer layer in which a lower embossed structure is formed, one on the upper embossing lacquer layer arranged upper reflective layer having an upper reflective layer structure and one disposed on the lower embossing lacquer layer lower reflection layer having a lower reflection layer structure.

The The invention relates to a manufacturing method for a security element for security papers, value documents or the like, in which a top and a bottom having carrier at the top with an upper embossing lacquer layer and on top with an upper reflective layer, and on the bottom with a lower embossing lacquer layer and thereupon with a lower reflective layer is provided, wherein in the upper embossing lacquer layer an upper embossed structure and in the lower embossing lacquer layer a lower embossed structure are formed, and the upper reflection layer has an upper reflection layer structure and the lower reflection layer has a lower reflection layer structure Has.

To protective items are often used equipped with a security element, which is a check the authenticity of the object allowed and at the same time as protection against illicit reproduction.

To protective objects are, for example, security papers, Identification and value documents (such as banknotes, chip cards, passports, identification cards, ID cards, stocks, bonds, certificates, vouchers, checks, Tickets, credit cards, health cards, ...) as well as product security elements, such as As labels, seals, packaging.

The Counterfeit security of a security element is then especially large if the security element on front like back shows perceptible motifs that are in a particular Position to each other and / or difficult to copy or copy are.

The generic WO 03/053713 A1 describes a security element which is constructed on a plastic film and carries on both sides of the plastic films relief structures that act as diffraction structures and, for example, as a hologram represent a motif. The relief structures are further provided with metal layers which are structured by interruptions, so that additionally a suitable pattern, for example a letter or another alphanumeric character, can be recognized. The structured metallization on the relief structures is designed as a reflective layer, so that the corresponding motif is visible in plan view.

Of the Invention is based on the object to a security element create that different at front and back Motifs and when viewed through transmitted light another motif in good quality shows.

These Task is solved by a security element for Security papers, documents of value or the like, with a top and a bottomed carrier, at least partially transparent or translucent, one on top attached, upper embossing lacquer layer in which an upper Embossed structure is formed, one on the bottom attached, lower embossing lacquer layer in which a lower Embossed structure is formed, one on the upper embossing lacquer layer arranged upper reflection layer, the upper reflection layer structure and one disposed on the lower embossing lacquer layer lower reflection layer having a lower reflection layer structure, wherein the lower reflective layer structure together with the upper Reflection layer structure in transmitted light viewing a visible Transmitted light effect, and the lower reflective layer structure and the upper reflection layer structure in each case a modulated line grid wherein the line direction of the upper reflection layer structure at an angle of 80 to 100 degrees to the line direction of the lower one Reflection layer structure is located.

The Task is further solved by a value document with a such security element.

Finally, the object is also achieved by a production method for a security element for security papers, documents of value or the like, in which a top and a bottom having carrier at the top with an upper embossing lacquer layer and then with an upper reflective layer, and at the bottom with a lower embossing lacquer layer and provided thereon with a lower reflection layer, wherein in the upper embossing lacquer layer, an upper embossing pattern and in the lower embossing lacquer layer a lower embossing pattern are formed, the upper reflection layer has an upper reflection layer structure, and the lower reflection layer has a lower reflection layer structure, and wherein the lower reflection layer layer structure together with the upper reflection layer structure in transmitted light observation effect a transmission light motif, and the lower reflection layer structure and the upper reflection layer structure each having a modulated line grid, wherein the line direction of the upper reflection layer structure is at an angle of 80 to 100 degrees to the line direction of the lower reflection layer structure.

The Invention provides a surprisingly simple design Security element that has both a recognizable from the front Front motif has, which from the back not is recognizable, as well as a visible from the back back motif has, which is imperceptible from the front. additionally is through the structures of the reflection layers in a transmitted light view visible transmitted light motif as another security feature available.

The Reflection layer structures are characterized by modulated line grids, preferably with a line width between 20 microns and 200 microns, more preferably between 50 microns and 150 microns, realized. The alignment of the line structures on the top and bottom avoid annoying moiré effects or locally different transmission properties surprising simply by placing the two line grids at an angle between 80 ° and 100 ° to each other. The crossed ones Line grids do not disturb each other and deliver in the transparent picture a well recognizable motive.

The Combination motif is from the upper and lower reflective layer structure generated together. Due to the crossed line grid need the reflection layer structures on top and bottom not consuming be passed. The production is thus much easier than in structures that have to have a certain position to each other.

By the use of a line width raster with crossed line directions the upper and lower reflection structures are superimposed, without being influenced. It is therefore easily possible an independent one for each of the two reflection layer structures To provide motive. Each of the realized motives, ie the upper one Motif, which generates the upper reflection layer structure, and the lower motif, that of the lower reflective layer structure is in the see-through image when overlaying The crossed line grid clearly visible.

In a simple construction of the security element are therefore the Independently generated by the reflective layer structures motifs and do not have to be coordinated as long as they are Do not interfere with the transparency. In a preferred development of the security feature arises in the superposition of upper and lower motif a combination motif, which is composed of the upper motif and the lower motif.

ever according to embodiments of the embossing lacquer layers and the motives caused thereby can be seen in the on the embossing lacquer layer located reflection layer, the respective reflection layer structure in plan view, possibly in an oblique plan view, be recognizable. Forming the upper reflection layer structure and the lower reflection layer structure so that they cause a combination motive, one sees from the Front side, on which the upper reflection layer structure is located, the corresponding part of the combination motif, and from the bottom the caused by the lower reflective layer structure part.

The embossing of the upper embossed structure or the lower embossed structure is preferably carried out with commercially available embossing lacquers, as used for example as heat sealing lacquers in the DE 10 2004 035 979 A1 are described, the disclosure of which is fully incorporated in this regard. In principle, thermoplastic, electron beam-curing or UV-curing embossing systems are suitable.

There at least one embossing lacquer layer on the support, which may for example be designed as a film, directly Anchorage is usually a good adhesion between 1 μm and 10 μm, preferably between 1.5 μm and 4 μm thick embossing lacquer layer. This can be achieved by the use of carrier materials, eg. B. Foil material can be achieved with suitable pretreatment. Examples of this are an acrylate coating in combination with a corona treatment before application of the embossing lacquer or printing of adhesion-promoting primers. By then achieved good adhesion the embossing lacquer against the carrier can used for embossing a pure casting method in which the embossing lacquer without further pretreatment in a Embossing cylinder is pressed. In this way receives one optimal reproduction of an embossed structure, resulting from a very good picture of the stamping tool. Brilliant embossed motifs are the result.

It is therefore preferred in a development that the top and / or the bottom is provided with a Prägelackhaftung improving treatment / are. It is also preferred if the upper and / or the lower embossing lacquer layer has a UV-curing embossing lacquer. Such UV embossing lacquers have the further advantage that they are particularly well suited as an acceptance layer for offset and steel stitch paints. You can thus the underground serve for a standard in banknote printing coverage with offset or steel stitch colors. A naturally otherwise possible at any time pressure receiving layer on one side of the security element can then be omitted.

Of the Protection by the security element is through the third in transmitted light recognizable motive particularly high. For this, the upper and the lower reflection layer not full-surface, but with motif-dependent Interruptions or openings provided to the line-scored to form upper and lower motif. In the case of a metallic reflection layer This structuring can be done, for example, by demetallization with technologies known to those skilled in the art (etching technology and washing process). In the case of a printed reflection layer becomes the required printing ink in the form of a fine motif printed.

The Security element can be used in particular as a security thread, tear thread, Security tape, security tape, patch or as a label for Application to a security paper, value document or the like trained be. In particular, the security element can transparent areas or span recesses.

Under the term security paper is here in particular not yet understandable precursor to a value document, in addition to the security element according to the invention For example, other authenticity features (such as in volume provided luminescent substances) may have. Under value documents Here, on the one hand, documents produced from security papers Understood. On the other hand, value documents can also be other Be documents and objects with the inventive Security feature, so that the value documents are not have replicable authenticity features, whereby an authenticity check possible and at the same time prevents unwanted copies become.

Under Translucency or tansluzent in this description becomes the partial Translucency of a body understood, so the property of letting light through without being transparent. Translucency is thus in contrast to transparency (= image or eye transmittance) to see. The reciprocal property of translucency is opacity. In the sense of this description, a body is translucent or transparent, if the transmittance in the visible optical radiation (= light) is at least 90%. at Transmittances between 10 and 90% is the body partially transparent or -tansluzent.

The Production method according to the invention can be so be further developed that the described preferred embodiments and embodiments of the security element are made.

It it is understood that the above and the following yet to be explained features not only in the specified Combinations, but also in other combinations or in isolation can be used without departing from the scope of the present invention.

following The invention is by way of example with reference to the accompanying Drawings which also disclose features essential to the invention, is explained in more detail. Show it:

1 a plan view of a banknote with a security element 1 .

2 an enlarged portion of a part of the section along the line AA of 1 .

3 a schematic representation of a line-scanned motif in an upper reflective layer of the security element,

4 a line grid for a lower reflective layer of the security element and

5 - 8th different overlays of the line grid of 3 and 4 ,

The figures are not shown to scale for ease of illustration. Furthermore, some hatchings are not shown to the structure of the corresponding security element 1 to present a clearer view. Incidentally, elements which in different embodiments functionally and / or structurally resemble or correspond bear the same reference numbers in all figures in order to avoid description repetitions. In the following description of interfaces is referred to as the front of the security element in the representations above page. The back is accordingly the bottom side. This convention is merely for ease of description and is not intended to be limiting as to the construction and / or application of the security element.

At the in 1 shown embodiment is a security element 1 like that in a banknote 2 integrated that security element 1 both from the in 1 shown front side of the banknote 2 as well as from the back of the banknote 2 is visible.

That on the banknote 2 provided security element 1 can also be part of a safe standardized thread 19 be the banknote, which, as in 1 exemplified, usually so in the paper of the banknote 2 Woven is that he partially on the front (the in 1 visible side) and partly visible on the back of the banknote. It is also possible to use the security element 1 at least partially over one in the banknote 2 provided windows 20 to arrange. Of course, these possibilities are only examples of the use of the security element described below 1 , which of course can also be used in other ways for copying or imitation protection of a protected object.

2 shows a sectional view through the security element 1 along the line AA the 1 , Basis for the security element 1 is a carrier 3 which can be realized, for example, by a plastic film. This plastic film is transparent or even translucent, as will be explained later.

At the front of the security element 1 is the top for the following description 4 of the carrier 3 , at the back of the security element 1 the bottom 5 of the carrier. On top 4 and bottom 5 are on the carrier 3 suitable adhesion promoter 6 respectively. 7 attached, which ensure that subsequent layers have a strong adhesion to the wearer 3 exhibit. The bonding agent 6 respectively. 7 can on the one hand by a suitable pretreatment of the carrier or use of films suitable coating, such. As acrylate coating in combination with corona treatment, or by printing of adhesion-promoting primers can be achieved.

On the with adhesion agent 6 respectively. 7 provided pages 4 . 5 of the carrier 3 now becomes an embossing lacquer layer 9 or an embossing lacquer layer 10 applied. The embossing lacquer layers obtained in this way 9 . 10 are now using an upper embossed structure 11 or a lower embossed structure 12 Mistake. Due to the good adhesion of the embossing lacquer layers 9 . 10 on the top 4 or bottom 5 of the carrier 3 can the embossing lacquer structures 11 respectively. 12 be pressed without further pretreatment with a stamping cylinder.

On the embossing lacquer layers 9 . 10 then reflection layers 8th . 14 applied. These are preferably reflective layers, which are for example by a metallization (for example, aluminum, copper, iron, chromium, gold, silver, etc. with optical densities between 1.3 oD to 4.5 oD, preferably between 1.8 oD to 3.0 oD) can be realized. Alternatively, printed glossy lacquer coatings are also possible. Also, various reflection layers may be combined to, as will be explained, desired optical phenomena of the security element 1 To create the motives presented to the viewer.

The embossing structures realize in connection with the reflective reflection layers 8th . 14 a top-side embossing motif and a bottom-side embossing motif, respectively, which are visible when viewed from the front side VS and viewed from the rear side RS, respectively. Of course, different motifs of the front side VS and the rear side RS can be used. Should one of the two sides of the security element 1 can be printed directly on the embossing lacquer 9 respectively. 10 if a UV embossing lacquer is used for this purpose. This is suitable as an acceptance layer for offset and spot colors. Print acceptance layers, which would require several operations for the application, are therefore no longer necessary.

The reflection layer 8th is provided with an upper reflective layer structure which effects a motif. Ie. the reflection layer 8th is on the top 4 of the carrier 3 not full-surface, but has a motivating varying opacity, ie a pattern. This is line rasterized. The same applies to the reflection layer 14 , The grid density of the grid structure or structuring of the reflection layers is chosen so that the structure and the motive caused by it when viewed from the front side VS and the back RS is not or very little noticeable. In the case of metallic reflection layers 8th . 14 For example, these patterns can be achieved by demetallizing with known technologies (etching technology and washing methods). If printed reflection layers are used, the respective motif is already produced during printing by application of the printing ink.

In transmitted light, the two reflection structures of the upper reflection layer act 8th and the upper reflective layer 14 together. In plan view, in particular in an oblique plan view, however, one not only sees through the embossed structures 11 and 12 produced embossed motifs, but may optionally also the structure and thus the subject in the upper or lower reflective layer 8th . 14 detect. This is what the security element represents 1 a total of five different motifs available. In addition to those already using the 3 explained come as security features nor in plan view, especially in oblique plan view, recognizable motifs of the upper reflective layer 8th and the lower reflective layer 14 ,

The security element 1 of the 3 thus has an upper embossed structure 11 on, which provides an embossed motif, which is visible from the front side VS ago. From the back RS ago is a other embossed motif recognizable that the lower embossed structure 12 causes.

Looking at the security element 1 however, in transmitted light mode, for example under illumination from the rear side RS and in viewing from the front side VS, one recognizes the structures and thus the motifs in the reflection layers 8th . 14 , Thus, as the third security feature, the apparent appearing in reflection motif of the reflection layers is formed. The structures of the upper reflection layer act here 8th and the lower reflective layer 14 together, if the security element 1 is viewed in transmitted light. For that in the upper reflective layer 8th or the lower reflection layer 14 incorporated motif can be a Linienbreitenrasterung be used, preferably with a line width between 20 microns and 200 microns, more preferably between 50 microns and 150 microns.

3 schematically shows the upper reflection layer structure 15 in the upper reflection layer 8th of the 2 , and 4 shows the lower reflection layer structure 18 in the lower reflection layer 14 of the 2 , Exemplary are for the upper reflection structure 15 in 3 two more top motives 16 and 17 shown when looking at the security element 1 from the front side VS forth in addition to the embossed motif, which through the upper embossed structure 11 in the embossing lacquer layer 9 is introduced, are visually recognizable. For ease of illustration, for the lower reflective layer structure 18 no motif drawn. Of course, one usually becomes a motif similar to the top motif 16 or 17 also in the lower reflective layer structure 18 provide.

Now we ordered the line directions of the upper reflection layer structure 15 and the lower reflective layer structure 18 completely parallel, it would be like 5 shows, depending on the registration, a more or less large disturbance of the perceptibility of the upper motifs 16 and 17 ,

Are the line grid still slightly tilted to each other, which can easily happen in practice, it is similar to inadequate Passerung in 5 also a strong disturbance of the perceptibility of the motifs, since a corresponding moiré effect occurs. this shows 6 ,

In order to avoid such disturbances of perceptibility, it is therefore ensured that the line grids of the upper reflection layer structure 15 and the lower reflective layer structure 18 as possible at right angles to each other. As 7 shows there is then virtually no disturbance of the motives. This is true as well 8th shows if the perpendicularity of the line is not maintained, but there is a deviation from the orthogonal position.

In practice, it has been shown that at an angle range between 80 ° and 100 °, ie 90 ° +/- 10 °, an almost imperceptible, in any case tolerable disturbance of the motifs in the upper reflective layer structure 15 and / or the lower reflective layer structure 18 are incorporated by Linienbreitenrasterung, it should be noted.

The carrier 3 can be made transparent. Then the image appearing in transmitted light is particularly clear. If one uses only a translucent carrier 3 At the expense of the quality of the transmitted light image, the separation of the front side VS from the embossed structure increases 11 formed image of the on the back RS through the lower embossed structure 12 caused image.

You want to at least one side of the security element 1 have a smooth surface, may conveniently still a topcoat 21 be attached to this page. This is in 2 entered dashed. Such cover layers are known in the art, for example from the already cited WO 03/053713 A1 ,

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• WO 03/053713 A1 [0006, 0050]
• DE 102004035979 A1 [0017]

Claims (9)

Security element for security papers, documents of value or the like, having - a top side ( 4 ) and a bottom ( 5 ) ( 3 ) which is at least partially transparent or translucent, - one on top ( 4 ), upper embossing lacquer layer ( 9 ), in which an upper embossed structure is formed, - one on the underside ( 5 ), lower embossing lacquer layer ( 10 ), in which a lower embossed structure is formed, - one on the upper embossing lacquer layer ( 9 ) arranged upper reflection layer ( 8th ) having an upper reflective layer structure ( 15 ), and - one on the lower embossing lacquer layer ( 10 ) arranged lower reflective layer ( 14 ) comprising a lower reflection layer structure ( 18 ), characterized in that - the lower reflective layer structure ( 18 ) together with the upper reflective layer structure ( 15 ) is visible in transmitted light observation as transmitted light motif and - the lower reflection layer structure ( 18 ) and the upper reflection layer structure ( 15 ) is generated in each case by a modulated line grid, wherein the line direction of the upper reflection layer structure ( 15 ) at an angle of 80 to 100 degrees to the line direction of the lower reflection layer structure ( 18 ) lies. A security element according to claim 1, wherein the upper reflection layer structure ( 15 ) and the lower reflection layer structure ( 18 ) each form a motif, wherein the two motifs in transmitted light view join together to form the combination motif. A security element according to claim 1 or 2, in which the upper side ( 4 ) and / or the underside ( 5 ) is provided with an embossing lacquer-improving treatment. Security element according to one of the above claims, in which the upper and / or lower embossing lacquer layer has a UV-curable embossing lacquer has. A security element according to any one of the preceding claims, wherein the carrier ( 3 ) is provided with a matting coating. Value document with a security element after a of claims 1 to 5. Method of manufacturing a security element for security papers, documents of value or the like, in which - a top side ( 4 ) and a bottom ( 7 ) carrier ( 3 ) at the top ( 4 ) with an upper embossing lacquer layer ( 9 ) and thereon with an upper reflection layer ( 8th ), and at the bottom ( 4 ) with a lower embossing lacquer layer ( 10 ) and thereon with a lower reflection layer ( 14 ), wherein - in the upper embossing lacquer layer ( 9 ) an upper embossing structure ( 11 ) and in the lower embossing lacquer layer ( 10 ) a lower embossed structure ( 12 ), - the upper reflection layer ( 8th ) having an upper reflective layer structure ( 15 ) and the lower reflection layer ( 14 ) having a lower reflection layer structure ( 18 ), characterized in that - the lower reflective layer structure ( 15 ) together with the upper reflective layer structure ( 18 ) is visible in transmitted light observation as see-through information and - the lower reflection layer structure ( 18 ) and the upper reflection layer structure ( 15 ) are respectively generated by a modulated line grid, wherein the line direction of the upper reflection layer structure ( 15 ) at an angle of 80 to 100 degrees to the line direction of the lower reflection layer structure ( 18 ) lies. Manufacturing method according to claim 7, in which the upper side ( 4 ) and / or the underside ( 5 ) is provided with an embossing lacquer-improving treatment. Manufacturing method according to one of the above method claims, wherein for the upper and / or lower embossing lacquer layer ( 9 . 10 ) a UV-curing embossing lacquer is used.

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