DE102009031386A1 - 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), an upper embossing lacquer layer (9) attached to the upper side (4), in which one upper embossed structure (11) is formed, a on the underside (4) attached, lower embossed lacquer layer (9), in which a lower embossed structure (11) is formed, wherein between the upper side (4) of the carrier (3) and the upper embossed lacquer layer (9) an upper reflective layer (8) is arranged.

Description

The The invention relates to a security element and to a production method for this.

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, Identity 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 WO 2008/017362 A3 describes different production methods for optically variable films in which an optically variable motif (ie one dependent on the viewing condition, eg the viewing direction, dependent image) on the front and another on the back and a third motif when viewed in transmitted light or in Transmission view is visible. The fabrication methods involve topographically different structures and subsequent demetallization of metal layers as well as mask exposure methods in which front side information forms a mask for the exposure of a back side. From the WO 2006/133863 A2 Different variants of optically variable patterns for a security element are known, which look different when viewing the front or back of the security element, so form different motifs.

The 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 Shows motifs and yet easy to manufacture, especially without consuming Passe conclusions. Next, it should preferably be the security element also allow, in a simple manner in transmitted light viewing to make a motif perceptible.

These Task is solved by a security element for Security papers, documents of value or the like, with a top and a bottom support, one on the Top mounted, top embossing lacquer layer, in the an upper embossed structure is formed, one on the Bottom mounted, lower embossing lacquer layer, in the a lower embossed structure is formed, wherein between the top of the carrier and the top embossing lacquer layer an upper reflection layer is arranged.

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

The Task also finally solves a manufacturing process for a security element for security papers, Value documents or the like., In which one a top and a bottom comprising carrier at the top with an upper reflective layer and thereon with an upper embossing lacquer layer and on the Bottom provided with a lower embossing lacquer layer is, wherein in the upper embossing lacquer layer has an upper embossed structure and a lower embossing pattern is formed in the lower embossing lacquer layer become.

The invention provides a surprisingly simple constructed security element, which has both a recognizable from the front side front motif, which is not visible from the front, and has a visible from the back back motif, which is imperceptible from the front. Since the front and back motifs are not visible from the other side, a registration of the two motifs to each other is not necessary. The separation of these two motifs is achieved in that the upper reflection layer is located between the upper embossing lacquer layer and the lower embossing lacquer layer. It causes a reflection of incoming light. Because unlike in the WO 03/053713 A1 the upper reflection layer does not rest directly on the embossed structure, as is the case with conventional hologram films, the front side motif can only be seen from the front and the back side motif only from the rear side.

Is sufficient for the security feature the presence of separate front and Rückseitenmoti ve, the upper reflection layer is to be executed over the entire surface. This may be, for example, a full-surface metallization comprising aluminum, copper, iron, chromium, gold or silver, etc. Alternatively or additionally, a printed glossy lacquer layer is also suitable as a reflection layer. Of course, various reflective layers can also be combined to impart a desired visual appearance, such as a desired color effect, to the front motif and back motif, respectively.

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 improving the bottom with an embossing lacquer adhesion Treatment is / are provided. Also, it is preferable if the upper and / or the lower embossing lacquer layer a UV-curing Embossing lacquer has. Have such UV embossing lacquers the further advantage that it acts as an acceptance layer for offset and steel stitch colors are particularly well suited. You can thus the underground for a usual banknote printing coverage serve with offset or steel stitch colors. A course otherwise anytime possible print acceptance layer on one side of the security element can then be omitted.

Of the inventive structure of the security element with internal reflection layer has several advantages. To the one is the reflection layer even, what their reflection properties improved. For another, it is through the wearer and the overlying embossing lacquer layer well protected. Consequently to achieve good chemical resistance and resistance against scratches.

Of the Protection by the security element can be further increased, if the reflection layer is structured with an upper motif, that in combination with an at least partially transparent or translucent carrier then visible in transmitted light observation is. For this purpose, the upper reflection layer is not full-surface, but with motivational interruptions or openings Mistake. In the case of a metallic reflection layer this can for example, by demetallization known to those skilled in the art Technologies (etching technology and washing process). In the case of a printed reflective layer, the required printing ink printed in the form of a fine motif. In this case can the separation of the embossed motifs through the openings be affected in principle in the reflection layer. To avoid this, preferably the structure is sufficient Fineness trained. In addition or optional you can this separation improve by the carrier only translucent, but not is transparent.

additionally can still another reflection layer between the bottom the carrier and the lower embossing lacquer layer applied and structured, which adds more possibilities the transmitted light provides, as the subjects of the lower reflective layer and the upper reflective layer then in transmitted light view Form combination motif.

For the upper motif and, if available, the lower motif is ideal the use of a modulated line grid, with a line thickness between 20 microns and 200 microns, preferably between 50 microns and 150 microns can be used varying. It has shown that disturbing moiré effects or locally different transmission properties then simply avoided can be when the two line grid at an angle between 80 ° and 100 ° to each other. It is because of that preferred that the lower motif and the upper motif respectively a modulated line grid are generated, wherein the line direction of the upper subject at an angle of 80 ° to 100 ° to Line direction of the lower subject is. Such crossed line grid do not disturb each other and allow in the Durchsichtsbild well recognizable motives.

The security element may in particular be designed as a security thread, tear-open thread, security strip, security strip, patch or as a label for application to a security paper, value document or the like. In particular, that can Security element span transparent areas or 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 view of the section along the line AA the 1 .

3 a sectional view similar 2 a further embodiment of the security element of 1 .

4 a sectional view similar 2 a further embodiment of the security element of 1 .

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

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

7 - 10 different overlays of the line grid of 5 and 6 ,

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 security 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 be ordered. 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 Trä ger 3 , which can be realized, for example, a plastic film. This plastic film may be 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. Subsequently, on the with adhesion promoter 6 provided top 4 of the carrier 3 a reflection layer 8th applied. This is preferably a reflective layer which can be obtained, for example, by a metallization (for example aluminum, copper, iron, chromium, gold, silver etc. with optical densities between 1.38 and 4.5 oD, preferably between 1, 8 oD to 3.0 oD) is realized. Alternatively, a printed glossy lacquer layer is 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.

On the reflection layer 8th as well as those with bonding agents 7 provided bottom 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. The embossed structures realize in connection with the reflective reflection layer 8th 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.

3 shows a development of the security element of 1 , wherein the layer structure essentially the basis of 2 explained corresponds. However, now is the reflection layer 8th additionally provided with a reflective layer structure that causes a motif. Ie. the reflection layer is on the top 4 of the carrier 3 not full-surface, but has a motivating varying opacity, ie a pattern. This can be z. B. be screened. The grid density of the grid structure or structuring of the reflection layer 8th is chosen so that the structure and the motive caused by it when looking from the front VS and the back RS is not or very little noticeable. In the case of a metallic reflection layer 8th For example, this structure can be achieved by demetallizing with known technologies (etching technology and washing methods). Using a printed reflective layer 8th , the motif is already created when printing by applying the printing ink.

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 another embossing motif is recognizable, which is the lower embossed structure 12 causes.

Looking at the security element 1 on the other hand, in the transmitted light mode, for example under illumination from the rear side RS and in viewing from the front side VS, one recognizes the pattern and thus the structure in the reflection layer 8th and the motive caused thereby. Thus, the third security feature is the subject in the reflection layer, which appears in a transparent manner 8th educated.

4 shows a development of the security element 1 of the 3 , in addition now also at the bottom 5 of the carrier 3 a lower reflection layer 14 is provided, which is provided with a lower reflective layer structure. In transmitted light, the two reflection layer 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 possibly also the pattern in the upper or lower reflective layer 8th . 14 recognize, of course, here again different patterns can be incorporated into the structure. 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 still in plan view, especially in oblique plan view, recognizable motifs through the upper reflective layer 8th and the lower reflection layer 14 ,

As already mentioned, the structures of the upper reflection layer act 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.

5 schematically shows the upper reflection layer structure 15 in the upper reflection layer 8th of the 4 , and 6 shows the lower reflection layer structure 18 in the lower reflection layer 14 of the 4 , Exemplary are for the upper reflection layer structure 15 in 5 two more top motives 16 and 17 shown when looking at the security element 1 from the front VS 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 through the lower reflective layer structure 18 form.

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 7 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 7 also a strong disturbance of the perceptibility of the motifs, since a corresponding moiré effect occurs. this shows 8th ,

In order to avoid such disturbances of perceptibility, care is therefore taken in a development that the line grid of the upper reflection layer structure 15 and the lower reflective layer structure 18 as possible at right angles to each other. As 9 shows, it then results in virtually no disturbance of the motives. This is true as well 10 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.

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 2008/017362 A3 [0005]
• WO 2006/133863 A2 [0005]
• WO 03/053713 A1 [0006, 0011]
• DE 102004035979 A1 [0013]

Claims (16)

Security element for security papers, documents of value or the like, having - a top side ( 4 ) and a bottom ( 5 ) ( 3 ), - one on the top ( 4 ), upper embossing lacquer layer ( 9 ), in which an upper embossed structure ( 11 ), - one on the underside ( 5 ), lower embossing lacquer layer ( 10 ), in which a lower embossed structure ( 12 ), wherein between the upper side ( 4 ) of the carrier ( 3 ) and the upper embossing lacquer layer ( 9 ) an upper reflection layer ( 8th ) is arranged. A security element according to claim 1, 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 preceding claims, in which the upper and / or lower embossing lacquer layer ( 9 . 10 ) has a UV-curing embossing lacquer. A security element according to any one of the preceding claims, wherein the carrier ( 3 ) is at least partially transparent or translucent, and in which the upper reflection layer ( 8th ) an upper reflection layer structure ( 15 ), which produces a visible in transmitted light view motif. A security element according to any one of the preceding claims, wherein between the underside ( 5 ) of the carrier ( 3 ) and the lower embossing lacquer layer ( 10 ) a lower reflection layer ( 14 ) is arranged. A security element according to claims 4 and 5, wherein the lower reflection layer ( 14 ) a lower reflection layer structure ( 18 ), which together with the upper reflection layer structure ( 14 ) causes a combination motif in transmitted light observation. A security element according to claim 6, wherein the lower and upper reflection layer structures ( 18 . 14 ) are respectively generated by a modulated line grid, wherein the line direction of the upper reflection layer structure ( 14 ) 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 4 or any one of the above claims in conjunction with claim 4, wherein the carrier ( 3 ) is translucent or provided with a matting coating. Value document with a security element after a of claims 1 to 8. 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 reflection layer ( 8th ) and thereon with an upper embossing lacquer layer ( 9 ), and at the bottom ( 4 ) with a lower embossing lacquer layer ( 10 ), wherein - in the upper embossing lacquer layer ( 9 ) an upper embossing structure ( 11 ) and in the lower embossing lacquer layer ( 9 ) a lower embossed structure ( 12 ) be formed. Manufacturing method according to claim 10, 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. Manufacturing method according to one of the above method claims, in which the upper reflection layer ( 8th ) having an upper reflective layer structure ( 15 ). Manufacturing method according to one of the above method claims, in which prior to application of the lower embossing lacquer layer ( 10 ) the underside with a lower reflection layer ( 14 ). Manufacturing method according to claim 14, wherein the lower reflection layer ( 14 ) having a lower reflection layer structure ( 18 ). A manufacturing method according to claim 15, wherein for the lower and upper reflective layer structures ( 18 . 14 ) a modulated line grid are generated, wherein the line direction of the upper reflection layer structure ( 18 ) at an angle of 80 to 100 degrees to the line direction of the lower reflection layer structure ( 15 ) lies.

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