EP3862191A1 - Drainage sieve for the production of security paper with a windowed security thread - Google Patents

Abstract

The invention relates to dewatering screens for the production of security paper with a window security thread which, after being embedded on at least one surface of the security paper, is visible in predetermined window areas of the security paper. A dewatering screen according to the invention comprises a carrier screen which is provided in a partial area with an injection-molded insert which has a relief with motif elements extending upwards from a base body and projecting over the surface of the carrier screen, in the form of the predetermined window areas of the security paper in which the window security thread should be visible, are formed and wherein the motif elements for generating micro-windows comprise micromotif elements which have a width transverse to the running direction of the thread to be embedded that is less than 50% of the thread width and is between 0.2 mm and 4 mm.

Description

The invention relates to a data carrier, in particular a value or security document, with a substrate comprising at least one paper layer with an embedded window security thread. The invention also relates to a dewatering screen for the production of security paper with a window security thread.

Data carriers, such as banknotes, shares, bonds, certificates, vouchers, checks, high-quality admission tickets, but also other forgery-prone papers, such as passports or other identification documents, are often provided with security elements for protection that allow the authenticity of the document of value to be checked and at the same time serve as protection against unauthorized reproduction. The security elements can be designed in the form of a security thread completely or partially embedded in the data carrier.

The introduction of a security thread into bank note paper is for example in the WO 2004/050991 A1 described. The security thread is unrolled from a driven roller during the production process of the paper and a constant mechanical tension is ensured by monitoring the tensile force of the security thread.

Window security threads are security threads that are neither applied to a surface of a data carrier substrate nor completely embedded in the substrate. Rather, they are partially embedded in the substrate in such a way that they are only visible in certain window areas on one or both opposing surfaces of the substrate.

In order to obtain data carriers with window security threads, bronze screen meshes with brass embossing stamps are usually in a form with several Bridges brought to create support surfaces for the security thread to be introduced during paper production. From the point of view of the designer, however, the possible designs are very limited and all known window thread variants have windows that are open over the entire thread width.

Proceeding from this, the invention is based on the object of specifying a data carrier of the type mentioned at the beginning with an attractive appearance and a high level of protection against forgery. The invention is also intended to provide a suitable apparatus and a method for producing such data carriers.

This object is achieved by the features of the independent claim. Developments of the invention are the subject of the dependent claims.

According to the invention, it is provided in a generic data carrier that the window areas comprise micro-windows produced by papermaking, which have an edge produced during papermaking with characteristic irregularities and whose width transversely to the thread direction is less than 50% of the thread width and between 0.2 mm and 4 mm lies.

The term window security thread is used in the context of the present description not only for narrow security threads with a width of 4 mm or less, but also for wide security threads with a width of 4 mm to about 30 mm, some of which are also referred to as security tapes in the patent literature . The embedding of such broad security threads in papermaking, for example, is in the publication EP 0 625 431 A1 described.

Within the scope of the invention, all window areas of a data carrier can be designed in the form of micro-windows or the data carrier can also have conventional window areas in addition to micro-windows.

The length of the micro-windows parallel to the longitudinal direction of the thread (sometimes also referred to as the height of the micro-windows) is advantageously between 0.2 mm and 4 mm, preferably between 0.3 mm and 3 mm and particularly preferably between 0.5 mm and 1 mm. Alternatively or additionally, the width of the micro-windows in the transverse direction of the thread is preferably between 0.3 mm and 3 mm, particularly preferably between 0.5 mm and 1 mm.

It can be provided with particular advantage that the window areas comprise several micro-windows lying next to one another in the transverse direction of the thread. These micro-windows are advantageously not exactly at the same height in the transverse direction of the thread, but rather are always offset from one another by a fraction of the window height. In other words, a straight line in the transverse direction of the thread intersects several of the mentioned micro-windows, but in each case at different points along the vertical extent of the micro-windows.

In advantageous refinements, the width of the micro-windows in the transverse direction of the thread is even less than 40%, preferably less than 30% of the thread width.

The window areas preferably include micro-windows, the outlines of which are patterns, characters or a coding, in particular a sequence of letters or numbers, such as a currency symbol or a value number. In particular in the case of wide security threads, the micro-windows can also be designed in the form of a face or portrait.

In advantageous configurations, the window areas comprise a plurality of micro-windows, the spatial arrangement of which forms a motif. The individual micro-windows themselves are not necessarily designed in the form of a motif; rather, the above-mentioned motif is formed by the arrangement of the entirety of the micro-windows. Such a motif can in particular consist of letters, characters or figures that are composed of the micro-windows as small building blocks. The outlines of the micro-windows can be designed the same or different. It is also possible that both the outlines of the micro-windows and their spatial arrangement each represent a motif or information. These motifs or information can be related to one another or complement one another to form an overall piece of information. The micro-windows can also form rasterized, point-cloud-like or strip-shaped windows.

In a further development of the invention, the micro-windows, as thin spots in the paper layer of the substrate, are part of a watermark projecting laterally beyond the window security thread. In this way, the micro-windows can be integrated into a comprehensive design of the data carrier, so that the attention value and the security against imitation are further increased. The watermark can in particular supplement, continue or repeat a motif formed by the outline or the spatial arrangement of the micro-windows or in the same or modified form.

According to another, likewise advantageous development of the invention, there is a motif formed by the outline or the arrangement of the micro-windows continued by any other security feature beyond the window security thread. The other security feature can consist, for example, in a printing layer, a color layer, a laser cut area, a watermark, a film or a hologram. In such a configuration, too, the other security feature can supplement, continue or repeat a motif formed by the outline or the arrangement of the micro-windows or in the same or modified form.

The window security thread is advantageously provided with diffraction structures, liquid crystal layers, thin-layer structures, recesses in opaque, in particular metallic layers, fluorescent substances, magnetic, conductive and / or metallic layers.

The invention also includes a dewatering screen for the production of security paper with a window security thread which protrudes at certain window areas on a surface of the security paper and is embedded in the interior of the security paper in areas lying therebetween. The dewatering screen comprises a carrier screen which is provided in a partial area with an injection-molded insert which has a relief with motif elements extending upwards from a base body and projecting over the surface of the carrier screen, which are designed in the form of the window areas of the window security thread. The motif elements include micromotif elements for generating micro-windows, which have a width transverse to the running direction of the thread to be embedded that is less than 50% of the thread width and is between 0.2 mm and 4 mm.

The invention further includes a dewatering screen of the type mentioned above, in which the dewatering screen comprises a carrier screen, which in a partial area has a screen embossing which has a relief with motif elements protruding over the surface of the carrier screen, which are designed in the form of the window areas of the window security thread. In order to generate micro-windows, the motif elements include micromotif elements which, transversely to the running direction of the thread to be embedded, have a width that is less than 50% of the thread width and is between 0.2 mm and 4 mm.

In advantageous variants of the invention, the injection-molded insert or the screen embossing comprises several micromotif elements lying next to one another transversely to the thread running direction for producing several micro-windows lying next to one another in the transverse direction of the thread.

In both designs of the dewatering screen, the motif elements preferably include micromotif elements, the outlines of which represent patterns, characters or a code, in particular a sequence of letters or numbers. Alternatively or additionally, the motif elements comprise a plurality of micromotif elements, the spatial arrangement of which forms a motif, in particular letters, characters or figures.

In an advantageous development of the invention, the injection molding insert or the screen embossing has, in addition to the motif elements for generating the window areas of the window security thread, a watermark relief in the form of a watermark to be generated in the security paper. The watermark relief can in particular supplement, continue or repeat a motif formed by the outline or the arrangement of the micromotif elements or in the same or modified form.

In the case of dewatering screens with an injection-molded insert, this is expediently formed from a hydrophobic plastic, for example from polyoxymethylene. To reduce wear and tear during operation, wear-reducing additives can be added to the plastic.

The injection-molded insert is preferably arranged in a cut-out area of the carrier screen and is only connected to it in a preferably serrated edge area. For this purpose, for example, a laser cutting device can be used to create a recess at the point on the screen fabric at which the injection molding insert is provided, which is somewhat smaller, for example 1/10 mm smaller, than the desired shape of the injection molding insert. The edge region can in particular be designed in the form of a pattern, preferably in a serrated shape. The injection-molded insert can be inserted or preferably injected into this cut-out partial area.

The carrier screen advantageously contains a screen fabric with at least one system each of interwoven warp threads running in the longitudinal direction and weft threads running transversely thereto, the screen fabric advantageously being either a metal fabric, in particular a bronze fabric, a metal-plastic mixed fabric, in particular a bronze plastic -Mixed fabric, or contains a pure synthetic fabric.

Furthermore, the injection molding insert preferably has a plurality of perforations which ensure dewatering during paper production. The dimensions of these drainage perforations are selected to be so small that no fibers adhere to them during paper manufacture. Typical perforation diameters are between 100 μm and a few 100 μm, for example around 500 μm. Taper in advantageous refinements the perforations towards the upper design surface of the injection molding insert or the perforations are designed to be tapered.

To produce an injection molding insert with an injection molding relief of the type described above, an injection molding tool can be used which contains an injection molding cavity into which plastic can be injected to produce the injection molding insert and which is provided with a multi-level tool relief in the form of the inverted injection molding relief. The injection molding tool including the injection molding cavity and the high-resolution multi-level tool relief can be formed by milling or by an additive manufacturing process as a layer sequence of a plurality of material layers that are firmly connected to one another.

To produce a screen embossing of the type described above, an embossing stick can be used which is provided with a high-resolution multi-level relief in the form of the inverted screen embossing. The die including the high-resolution multi-level relief can be formed by milling or by an additive manufacturing process as a layer sequence of a plurality of material layers firmly connected to one another.

Particularly suitable additive manufacturing processes are selective laser sintering, selective laser melting, electron beam melting, 3D printing with powder, melt coating, laser deposition welding, multi-jet modeling, a PolyJet process, stereolithography, laminated object modeling, film transfer imaging or digital light processing.

Further details on the structure, properties and manufacture of the injection molding tool or the die head can be found in the application DE 10 2014 008 752.2 are taken, the disclosure content of which is included in the present application.

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

Fig.1

eine schematische Darstellung einer Banknote mit einem erfindungsgemäßen Sicherheitselement in Form eines Fenstersicherheitsfadens,

Fig. 2 und 3

jeweils eine Detaildarstellung von Fensterbereichen mit Mikrofenstern einer erfindungsgemäßen Banknote in Aufsicht,

Fig. 4 und 5

jeweils eine schematische Darstellung eines erfindungsgemäßen Entwässerungssiebs, das zur Erzeugung von Mikrofenstern eingesetzt wird,

Fig. 6

Aufsichten auf eine Banknote mit einer Mehrzahl von Mikrofenstern, die in Ensembles von Mikrofenstern in Form eines Eurosymbols angeordnet sind, wobei (a) ein einzelnes Ensemble von Mikrofenstern und (b) mehrere, in Fadenlängsrichtung beabstandet und in Fadenquerrichtung gegeneinander versetzt angeordnete Ensembles von Mikrofenstern zeigt, und

Fig. 7

eine Gestaltung, bei der das Design einer Reihe papiermacherisch hergestellter Mikrofenster außerhalb des Sicherheitsfadens von einem Druckmuster fortgesetzt wird.

Show it:

Fig. 1

a schematic representation of a banknote with a security element according to the invention in the form of a window security thread,

Figs. 2 and 3

each a detailed representation of window areas with micro-windows of a banknote according to the invention in plan view,

Figures 4 and 5

each a schematic representation of a dewatering screen according to the invention, which is used to produce micro-windows,

Fig. 6

Top views of a banknote with a plurality of micro-windows, which are arranged in ensembles of micro-windows in the form of a euro symbol, with (a) showing a single ensemble of micro-windows and (b) several ensembles of micro-windows that are spaced apart in the longitudinal direction of the thread and offset from one another in the transverse direction of the thread , and

Fig. 7

a design in which the design of a series of papermaking micro-windows outside the security thread is continued by a printed pattern.

The invention will now be explained using the example of window security threads for bank notes and other documents of value. Fig. 1 shows a schematic representation of a bank note 10 with a paper substrate 12, which is provided with a window security thread 14 according to the invention. The window security thread 14 protrudes in window areas 16 on the surface of the bank note 10, while it is embedded in the intervening web areas 18 in the interior of the bank note 10.

In the representation of the Fig. 1 all window areas 16 of the window security thread 14 are shown schematically as rectangles. As in the detailed representation of the Fig. 2 As shown, the window areas 16 comprise micro-windows 20 produced by papermaking according to the invention, which in the exemplary embodiment are designed in the form of digits "1" and "5" lying next to one another in the transverse direction of the thread, which together form the digit sequence "15". When viewed from above, the micro-windows 20 reveal the window security thread 14 embedded in the paper, so that the security features arranged on the window security thread 14, for example a diffraction structure or a color-shifting layer, are visible there. In the web areas 18 between the window areas 16, the window security thread 14 is covered by the paper layer 12 and the security features arranged thereon are therefore not visible.

Since the micro-windows 20, as described below, were produced during papermaking, they have an edge 22 with characteristic irregularities, which in this description is also often referred to as the deckle edge will. The irregular edge structure is created by an irregular accumulation of fibers in the edge area and by individual fibers protruding into the hole.

The width b _{M of} the micro-window 20 is significantly smaller than the thread width b _F , which is, for example, 4 mm, and in the exemplary embodiment is only about 1 mm (25% of the thread width, number "1") or 1.5 mm (37 , 5% of the thread width, number "5"). The height h _{M of} the micro-windows 20, that is to say the extent in the longitudinal direction L of the thread, is approximately 2 mm and is therefore also significantly smaller than the window areas in conventional window threads. As usual, the direction parallel to the longitudinal extent of the security thread is referred to as the longitudinal direction L of the thread and the direction perpendicular thereto as the transverse direction Q of the thread.

Another special feature of the designs according to the invention is that several micro-windows 20 can lie next to one another in the thread transverse direction Q, in the exemplary embodiment of FIG Fig. 2 for example the digits "1" and "5", which together form the digit sequence "15".

Fig. 3 shows another embodiment in which the micro-windows 20 in the form of small stars with an irregular deckle edge 22 and a diameter of approximately b _M = 1.5 mm are arranged offset from one another at a distance of approximately 2 mm. The micro-windows 20 reveal the window security thread 14 embedded in the paper, so that its security features can appear there. The size of the micro-windows b _M is significantly smaller than the thread width b _F (b _M = 0.375 b _F ); in addition, two micro-windows 20 are partially arranged next to one another in the thread transverse direction Q, but without being exactly at the same height.

It goes without saying that the bank note 10 can also have conventional window areas in addition to window areas with the described micro-windows 20. However, since these are known, they will not be discussed in more detail in the present application.

To arrangements like those related to the Figures 2 and 3 To generate the micro-window 20 described in the area of a window security thread 14, according to the invention, the method shown in FIG Fig. 4 Dewatering screen 30 shown schematically in a section transverse to the thread running direction is used.

The dewatering screen 30 comprises a carrier screen 32 with a screen fabric 34 which is cut out in a partial area 40. The screen fabric 34 has at least one system each of interwoven warp threads 36 running in the longitudinal direction and weft threads 38 running transversely thereto. In the context of the present invention, the screen fabric can contain, for example, a metal fabric, in particular a bronze fabric, a metal-plastic mixed fabric, in particular a bronze-plastic mixed fabric, or also a pure plastic fabric. The carrier screen 32 can contain both a single-layer and a multi-layer screen mesh, with only a single-layer screen mesh being shown in the figure for the sake of simplicity.

A plastic injection-molded insert 50 is arranged in the cut-out partial area 40 of the screen mesh 34 and is connected to the screen mesh 34 at its edge. In principle, the connection can be made in a variety of ways, for example by means of a plastic encapsulation or back injection molding, with the aid of a plurality of fastening knobs arranged along the edge, or also by welding or gluing. In the exemplary embodiment, a currently preferred variant is implemented in which the injection molding insert 50 is injected with a corresponding tool shape directly into the cut-out portion 40 of the screen mesh 34 and thereby forms a particularly intimate connection with the screen mesh.

The injection molding insert 50 has a relief 52 in the form of the window areas 16 of the window security thread 14 and contains a base body 54, from which motif elements in the form of the window areas 16 extend upwards and protrude beyond the screen surface. It is essential for the present invention that the motif elements contain small micromotif elements 56 which are designed in the shape and size of the micro-windows 20 and which extend upwards with a sharp edge. In the exemplary embodiment, the relief 52 is manufactured by means of a milling technique, so that the flanks 57 of the small micromotif elements 56 enclose an angle of approximately 15 ° with the surface normal.

During paper production in a cylinder mold paper machine, the security thread 14 to be embedded is fed as an endless element from a spool via a deflection roller to the dewatering screen 30 with the injection molding insert 50. While the injection molding insert 50 is immersed in the paper pulp, the security thread 14 rests on the motif elements and in particular also on the micromotif elements 56 of the injection molding insert 50.

Since there is a negative pressure inside the dewatering screen 30, the water of the water-fiber dispersion of the pulp is sucked into the interior of the dewatering screen. The fibers are deposited on the surface of the dewatering screen 30 and the injection molding insert 50 and form the desired paper web. At the points where the security thread 14 rests on the motif elements or the micromotif elements 56, the security thread is sucked into the drainage sieve by the negative pressure, so that no fiber mass can accumulate there. Accordingly, the security thread 14 remains free of fiber mass in the areas of the motif elements or the micromotif elements 56, while paper fibers are deposited in the surrounding areas and the security thread 14 is embedded in the paper. The motif elements or the micromotif elements 56 therefore produce the desired window areas or micro-windows 20 in the paper layer that is being formed.

Because of the papermaking production of the micro-windows 20, the edge region 22 of the micro-windows is not completely sharp, as is the case, for example, with a subsequent production of holes by means of punching or laser cutting. Rather, fibers accumulate in the edge area of the micro-windows 20, which protrude somewhat into the opening in an irregular manner and thereby produce the characteristic deckle edge.

The extent of the edge sharpness or edge blurring of the micro-windows 20 can be predetermined by the three-dimensional shape of the micromotif elements 56. Micromotif elements, such as micromotif elements 56 of FIG Fig. 4 , which have very steep flanks 57 and a small edge width, produce edge regions 22 with small irregularities, while micromotif elements with flatter edges and a larger edge width, such as those in FIG Fig. 5 Generate micromotif elements 58 shown, micro-windows 20 with highly irregular edge regions 22.

The edge width of a micromotor element is that width within which the height of a micromotor element drops from 90% of the maximum height to 10%. Micro-windows with only slightly irregular edge regions can be produced with micromotif elements 56 with an edge width of 0.6 mm or less, 0.5 mm or less, or even 0.4 mm or less become. Micromotif elements 58 with an edge width of more than 0.6 mm, more than 1 mm or even more than 1.5 mm, on the other hand, can produce micro-windows with highly irregular edge regions 22.

The injection molding insert 50 is furthermore provided with a plurality of perforations 48 in order to ensure drainage during papermaking also in the area of the injection molding insert. The diameter of the perforations 48 is selected to be so small that no fibers adhere to them during paper manufacture. Typical perforation diameters are between 100 μm and a few 100 μm, for example around 500 μm.

Figures 6 and 7 show further advantageous embodiments of micro-windows according to the invention in bank notes or other data carriers. When designing the Fig. 6 (a) the micro-windows 20 are formed in the form of ovals with dimensions of 0.4 mm x 0.3 mm. In each case a plurality of oval micro-windows 20 forms an ensemble 24, the micro-windows 20 of which are spatially arranged relative to one another in such a way that they together form the euro symbol “€” as a motif. As in Fig. 6 (a) As further shown, the ensemble 24 contains several micro-windows 20 lying next to one another in the transverse direction of the thread, but these are never exactly at the same height in the transverse direction of the thread, but rather are always offset from one another by a fraction of the height of the micro-window.

As in the embodiments described above, the micro-windows 20 reveal the window security thread 14 embedded in the paper and allow the security features arranged thereon, for example formed by a printing layer, a color layer or other functional layer, to become visible.

When designing the Fig. 6 (b) several ensembles 24 of micro-windows 20, each in the form of the euro symbol €, are arranged spaced apart in the longitudinal direction L of the thread. The ensembles 24 as a whole are slightly offset from one another in the transverse direction Q in order to compensate for fluctuations in the introduction of the security thread 14 into the paper, for example due to wobbling. If Δ denotes the maximum distance by which a security thread 14 can be introduced into the security paper 12 offset in the transverse direction Q due to wobbling, it can be ensured by offsetting the euro symbol ensembles 24 by up to a distance Δ to the right and left that In the longitudinal direction, a few complete symbol ensembles 24 always lie directly above the security thread 14 and form the desired micro-windows in the form of the euro symbol.

The design of the micro-windows does not have to be limited to the security thread 14, but can also continue laterally beyond it, for example in the form of a watermark or by another security feature. For illustration shows Fig. 7 a design in which a row of papermaking micro-windows 26 is arranged over a window security thread 14 and, as described above, reveals the security features of the embedded window security thread 14. The circular disk-shaped micro-windows 26 have different sizes, but are all significantly smaller than the thread width, so that several micro-windows 26 lie next to one another in the transverse direction Q of the thread.

The design formed by the micro-windows 26 is continued outside the security thread 14 by a print pattern 28 in the form of a printed point cloud and is thereby integrated into the overall design of the bank note 10. This also significantly increases the security of the banknote from being copied, since the security thread 14 is not through a security thread without a micro-window 26 can be replaced and since the security thread 14 must also be correctly aligned with the print pattern 28 in the longitudinal direction.

Instead of a printing layer, a motif formed by the outline or the arrangement of the micro-windows can also be continued, for example, by a watermark. The micro-windows, which in any case represent thin spots in the paper layer of a data carrier, are preferably part of a watermark that protrudes laterally beyond the window security thread.

• Ausgestaltung 1. Datenträger insbesondere Wert- oder Sicherheitsdokument, mit einem Substrat das zumindest eine Papierlage umfasst, wobei in das Substrat ein Fenstersicherheitsfaden eingebettet ist, der an zumindest einer Oberfläche des Substrats in bestimmten Fensterbereichen sichtbar ist, dadurch gekennzeichnet, dass die Fensterbereiche papiermacherisch erzeugte Mikrofenster umfassen, die einen bei der Papierherstellung erzeugten Rand mit charakteristischen Unregelmäßigkeiten aufweisen und deren Breite quer zur Fadenrichtung weniger als 50% der Fadenbreite beträgt und zwischen 0,2 mm und 4 mm liegt.
• Ausgestaltung 2. Datenträger nach Ausgestaltung 1, dadurch gekennzeichnet, dass die Länge der Mikrofenster parallel zur Fadenlängsrichtung zwischen 0,2 mm und 4 mm, vorzugsweise zwischen 0,3 mm und 3 mm und besonders bevorzugt zwischen 0,5 mm und 1 mm liegt, und/ oder dass die Breite der Mikrofenster in Fadenquerrichtung zwischen 0,3 mm und 3 mm, vorzugsweise zwischen 0,5 mm und 1 mm liegt.
• Ausgestaltung 3. Datenträger nach Ausgestaltung 1 oder 2, dadurch gekennzeichnet, dass die Fensterbereiche mehrere, in Fadenquerrichtung nebeneinander liegende Mikrofenster umfassen.
• Ausgestaltung 4. Datenträger nach wenigstens einer der Ausgestaltungen 1 bis 3, dadurch gekennzeichnet, dass die Breite der Mikrofenster in Fadenquerrichtung weniger als 40%, bevorzugt weniger als 30% der Fadenbreite beträgt.
• Ausgestaltung 5. Datenträger nach wenigstens einer der Ausgestaltungen 1 bis 4, dadurch gekennzeichnet, dass die Fensterbereiche Mikrofenster umfassen, deren Umrisse Muster, Zeichen oder eine Codierung, insbesondere eine Buchstaben- oder Ziffernfolge darstellen.
• Ausgestaltung 6. Datenträger nach wenigstens einer der Ausgestaltungen 1 bis 5, dadurch gekennzeichnet, dass die Fensterbereiche eine Mehrzahl von Mikrofenstern umfassen, deren räumliche Anordnung ein Motiv, insbesondere Buchstaben, Zeichen oder Figuren bildet.
• Ausgestaltung 7. Datenträger nach wenigstens einer der Ausgestaltungen 1 bis 6, dadurch gekennzeichnet, dass die Mikrofenster als Dünnstellen in der Papierlage des Substrats Teil eines seitlich über den Fenstersicherheitsfaden hinausragenden Wasserzeichens sind.
• Ausgestaltung 8. Datenträger nach wenigstens einer der Ausgestaltungen 1 bis 7, dadurch gekennzeichnet, dass ein von dem Umriss oder der Anordnung der Mikrofenster gebildetes Motiv durch ein anderes Sicherheitsmerkmal über den Fenstersicherheitsfaden hinaus fortgesetzt ist. Ausgestaltung 9. Datenträger nach wenigstens einer der Ausgestaltungen 1 bis 8, dadurch gekennzeichnet, dass der Fenstersicherheitsfaden mit Beugungsstrukturen, Flüssigkristallschichten, Dünnschichtaufbauten, Aussparungen in opaken, insbesondere metallischen Schichten, Fluoreszenzstoffen, magnetischen, leitfähigen und/oder metallischen Schichten versehen ist.
• Ausgestaltung 10. Entwässerungssieb für die Herstellung von Sicherheitspapier mit einem Fenstersicherheitsfaden, der nach seiner Einbettung an zumindest einer Oberfläche des Sicherheitspapiers in bestimmten Fensterbereichen sichtbar ist, wobei das Entwässerungssieb ein Trägersieb umfasst, das in einem Teilbereich mit einem Spritzgusseinsatz versehen ist, der ein Relief mit sich von einem Grundkörper nach oben erstreckenden und die Oberfläche des Trägersiebs überragenden Motivelementen aufweist, die in Form der Fensterbereiche des Fenstersicherheitsfadens ausgebildet sind, und wobei die Motivelemente zur Erzeugung von Mikrofenstern Mikromotivelemente umfassen, die quer zur Laufrichtung des einzubettenden Fadens eine Breite aufweisen, die weniger als 50% der Fadenbreite beträgt und zwischen 0,2 mm und 4 mm liegt.
• Ausgestaltung 11. Entwässerungssieb für die Herstellung von Sicherheitspapier mit einem Fenstersicherheitsfaden, der nach seiner Einbettung an zumindest einer Oberfläche des Sicherheitspapiers in bestimmten Fensterbereichen sichtbar ist, wobei das Entwässerungssieb ein Trägersieb umfasst, das in einem Teilbereich eine Siebprägung aufweist, die ein Relief mit die Oberfläche des Trägersiebs überragenden Motivelementen aufweist, die in Form der Fensterbereiche des Fenstersicherheitsfadens ausgebildet sind, und wobei die Motivelemente zur Erzeugung von Mikrofenstern Mikromotivelemente umfassen, die quer zur Laufrichtung des einzubettenden Fadens eine Breite aufweisen, die weniger als 50% der Fadenbreite beträgt und zwischen 0,2 mm und 4 mm liegt.
• Ausgestaltung 12. Entwässerungssieb nach Ausgestaltung 10 oder 11, dadurch gekennzeichnet, dass der Spritzgusseinsatz bzw. die Siebprägung mehrere, quer zur Fadenlaufrichtung nebeneinander liegende Mikromotivelemente umfasst.
• Ausgestaltung 13. Entwässerungssieb nach einer der Ausgestaltungen 10 bis 12, dadurch gekennzeichnet, dass die Motivelemente Mikromotivelemente umfassen, deren Umrisse Muster, Zeichen oder eine Codierung, insbesondere eine Buchstaben- oder Ziffernfolge darstellen, und/oder dass die Motivelemente eine Mehrzahl von Mikromotivelementen umfassen, deren räumliche Anordnung ein Motiv, insbesondere Buchstaben, Zeichen oder Figuren bildet.
• Ausgestaltung 14. Entwässerungssieb nach wenigstens einer der Ausgestaltungen 10 bis 13, dadurch gekennzeichnet, dass der Spritzgusseinsatz bzw. die Siebprägung neben den Motivelementen zur Erzeugung der Fensterbereiche des Fenstersicherheitsfadens ein Wasserzeichenrelief in Form eines in dem Sicherheitspapier zu erzeugenden Wasserzeichens aufweist.
• Ausgestaltung 15. Entwässerungssieb nach wenigstens einer der Ausgestaltungen 10,12 bis 14, dadurch gekennzeichnet, dass der Spritzgusseinsatz in einem ausgeschnittenen Bereich des Trägersiebs angeordnet und nur in einem vorzugsweise gezackten Randbereich mit diesem verbunden ist.
• Ausgestaltung 16. Entwässerungssieb nach wenigstens einer der Ausgestaltungen 10, 12 bis 15, dadurch gekennzeichnet, dass der Spritzgusseinsatz eine Mehrzahl von Perforationen aufweist, deren Abmessungen so klein sind, dass in ihnen bei der Papierherstellung keine Fasern anhaften.

Illustrative designs:

• Embodiment 1. Data carrier, in particular a value or security document, with a substrate comprising at least one paper layer, with a window security thread embedded in the substrate, which is visible on at least one surface of the substrate in certain window areas, characterized in that the window areas are micro-windows produced by papermaking include, which have an edge produced during papermaking with characteristic irregularities and whose width transversely to the thread direction is less than 50% of the thread width and is between 0.2 mm and 4 mm.
• Embodiment 2. Data carrier according to embodiment 1, characterized in that the length of the micro-windows parallel to the longitudinal direction of the thread is between 0.2 mm and 4 mm, preferably between 0.3 mm and 3 mm and particularly preferably between 0.5 mm and 1 mm, and / or that the width of the micro-windows in the transverse direction of the thread is between 0.3 mm and 3 mm, preferably between 0.5 mm and 1 mm.
• Embodiment 3. Data carrier according to embodiment 1 or 2, characterized in that the window areas comprise several micro-windows lying next to one another in the transverse direction of the thread.
• Embodiment 4. Data carrier according to at least one of the embodiments 1 to 3, characterized in that the width of the micro-windows in the transverse direction of the thread is less than 40%, preferably less than 30% of the thread width.
• Embodiment 5. Data carrier according to at least one of the embodiments 1 to 4, characterized in that the window areas comprise micro-windows, the outlines of which represent patterns, characters or a code, in particular a sequence of letters or numbers.
• Embodiment 6. Data carrier according to at least one of the embodiments 1 to 5, characterized in that the window areas comprise a plurality of micro-windows, the spatial arrangement of which forms a motif, in particular letters, characters or figures.
• Embodiment 7. Data carrier according to at least one of the embodiments 1 to 6, characterized in that the micro-windows, as thin spots in the paper layer of the substrate, are part of a watermark projecting laterally beyond the window security thread.
• Embodiment 8. Data carrier according to at least one of the embodiments 1 to 7, characterized in that a motif formed by the outline or the arrangement of the micro-windows is continued by another security feature beyond the window security thread. Embodiment 9. Data carrier according to at least one of the embodiments 1 to 8, characterized in that the window security thread is provided with diffraction structures, liquid crystal layers, thin-film structures, recesses in opaque, in particular metallic layers, fluorescent substances, magnetic, conductive and / or metallic layers.
• Embodiment 10. Dewatering screen for the production of security paper with a window security thread, which is visible after its embedding on at least one surface of the security paper in certain window areas, wherein the dewatering screen comprises a carrier screen which is provided in a partial area with an injection molding insert with a relief has motif elements extending upwards from a base body and projecting beyond the surface of the carrier screen, which are designed in the form of the window areas of the window security thread, and wherein the motif elements for generating micro-windows comprise micromotif elements which have a width transverse to the running direction of the thread to be embedded that is less than 50% of the thread width and is between 0.2 mm and 4 mm.
• Embodiment 11. Dewatering screen for the production of security paper with a window security thread, which is visible after its embedding on at least one surface of the security paper in certain window areas, wherein the dewatering screen comprises a carrier screen which has a screen embossing in a partial area, which has a relief with the surface of the carrier screen has motif elements protruding above, which are designed in the form of the window areas of the window security thread, and wherein the motif elements for generating micro-windows comprise micromotif elements which are transverse to the running direction of the thread to be embedded have a width which is less than 50% of the thread width and is between 0.2 mm and 4 mm.
• Embodiment 12. Dewatering screen according to embodiment 10 or 11, characterized in that the injection molding insert or the screen embossing comprises several micromotif elements lying next to one another transversely to the thread running direction.
• Embodiment 13. Dewatering screen according to one of the embodiments 10 to 12, characterized in that the motif elements comprise micromotif elements, the outlines of which represent patterns, characters or a code, in particular a sequence of letters or numbers, and / or that the motif elements comprise a plurality of micromotif elements, the spatial arrangement of which forms a motif, in particular letters, characters or figures.
• Embodiment 14. Dewatering screen according to at least one of the embodiments 10 to 13, characterized in that the injection molding insert or the screen embossing has a watermark relief in the form of a watermark to be generated in the security paper in addition to the motif elements for generating the window areas of the window security thread.
• Embodiment 15. Dewatering screen according to at least one of the embodiments 10, 12 to 14, characterized in that the injection-molded insert is arranged in a cut-out area of the carrier screen and is only connected to it in a preferably serrated edge area.
• Embodiment 16. Dewatering screen according to at least one of the embodiments 10, 12 to 15, characterized in that the injection molding insert has a plurality of perforations, the dimensions of which are so small that no fibers adhere to them during papermaking.

List of reference symbols

10

Banknote

12th

Paper substrate

14th

Window security thread

16

Window areas

18th

Bridge areas

20th

Micro window

22nd

Edge with characteristic irregularities

24

Ensemble of micro windows

26th

Micro window

28

Print sample

30th

Drainage screen

32

Carrier screen

34

Screen mesh

36

Warp threads

38

Weft threads

40

cut out section

48

Perforations

50

Watermark insert

52

relief

54

Base body

56, 58

Micromotif elements

57

Flanks

L.

Longitudinal direction of the thread

Q

Cross thread direction

Claims (7)

Dewatering screen for the production of security paper with a window security thread which is visible after its embedding on at least one surface of the security paper in predetermined window areas of the security paper, wherein the dewatering screen comprises a carrier screen which is provided in a partial area with an injection-molded insert with a relief has motif elements extending upward from a base body and projecting over the surface of the carrier screen, which are designed in the form of the predetermined window areas of the security paper in which the window security thread is to be visible, and wherein the motif elements for generating micro-windows include micromotif elements that are transverse to the running direction of the to be embedded thread have a width which is less than 50% of the thread width and is between 0.2 mm and 4 mm. Dewatering screen for the production of security paper with a window security thread, which is visible after its embedding on at least one surface of the security paper in predetermined window areas of the security paper, wherein the dewatering screen comprises a carrier screen which has a screen embossing in a partial area, which has a relief with the surface of the Has motif elements projecting above the carrier screen, which are designed in the form of the predetermined window areas of the security paper in which the window security thread is to be visible, and wherein the motif elements for generating micro-windows comprise micromotif elements which have a width transversely to the running direction of the thread to be embedded that is less than 50% of the thread width and between 0.2 mm and 4 mm. Dewatering screen according to Claim 1 or 2, characterized in that the injection-molded insert or the screen embossing comprises a plurality of micromotif elements lying next to one another at right angles to the direction of the thread running direction. Drainage sieve according to one of claims 1 to 3, characterized in that the motif elements comprise micromotif elements, the outlines of which represent patterns, characters or a coding, in particular a sequence of letters or numbers, and / or that the motif elements comprise a plurality of micromotif elements, their spatial arrangement forms a motif, in particular letters, characters or figures. Dewatering screen according to at least one of claims 1 to 4, characterized in that the injection molding insert or the screen embossing has a watermark relief in the form of a watermark to be created in the security paper in addition to the motif elements for generating the window areas of the window security thread. Dewatering screen according to at least one of Claims 1, 3 to 5, characterized in that the injection-molded insert is arranged in a cut-out area of the carrier screen and is only connected to it in a preferably serrated edge area. Dewatering screen according to at least one of Claims 1, 2 to 5, characterized in that the injection-molded insert has a plurality of perforations, the dimensions of which are so small that no fibers adhere to them during papermaking.

Images