WO2016119994A1

WO2016119994A1 - Data carrier with a windowed security thread

Info

Publication number: WO2016119994A1
Application number: PCT/EP2016/000021
Authority: WO
Inventors: Andreas Aigner; Thomas Gerhardt; André Gregarek; Rudolf Seidler
Original assignee: Giesecke & Devrient Gmbh
Priority date: 2015-01-20
Filing date: 2016-01-07
Publication date: 2016-08-04
Also published as: EP3247571A1; EP3862191A1; ES2874580T3; RU2674943C1; EP3862191B1; PL3247571T3; CN107438686A; CN107438686B; DE102015000690A1; EP3247571B1

Abstract

The invention relates to a data carrier (10), in particular a value or security document, comprising a substrate (12) having at least one paper layer, a windowed security thread (14) being embedded in the substrate (12) and being visible on at least one surface of the substrate in determined window areas (16). According to the invention, the windowed areas (16) comprise micro-windows (20) produced during the paper-making process, having an edge (22) produced during the paper-making process and characteristic irregularities, and the width (b_M) thereof transversely to the direction of the thread represents less than 50% of the width of the thread (b_F) and is between 0.2 mm and 4 mm.

Description

Disk with a window security thread

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

Data carriers, such as banknotes, stocks, bonds, certificates, vouchers, checks, high-quality admission tickets, but also other forgery-prone papers, such as passports or other identity documents, are often provided with security elements for the purpose of security, which permit verification of the authenticity of the value document and which also serve as protection against unauthorized reproduction. The security elements can be designed in the form of a security thread which is wholly or partly embedded in the data carrier.

The introduction of a security thread in banknote paper is described for example in WO 2004/050991 AI. During the manufacturing process of the paper, the security thread is unrolled from a driven roller 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 fully embedded in the substrate. Rather, they are partially embedded in the substrate such that they are visible on one or both opposite surfaces of the substrate only in certain windows. In order to obtain data carriers with window security threads, bronze mesh fabrics with brass stamping dies are generally made into a mold with several The webs are brought to create contact surfaces for the security thread to be introduced in papermaking. From the designer's perspective, however, the possible designs are very limited and all known types of window threads have windows which are open over the entire thread width.

Proceeding from this, the present invention seeks to provide a data carrier of the type mentioned above with an attractive appearance and high security against counterfeiting. The invention is also intended to provide a suitable apparatus and method for making such data carriers.

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

According to the invention, it is provided in the case of a generic data carrier that the window regions comprise micromachined microfibers which have a characteristic edge in papermaking and whose width across the thread direction is less than 50% of the thread width and between 0.2 mm and 4 mm.

The term window security thread is used in 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, which in the patent literature sometimes as security tapes be designated. The embedding of such broad Security threads in papermaking is described, for example, in document EP 0 625 431 A1.

In the context 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 yarn longitudinal direction (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. With particular advantage, it can be provided that the window areas comprise a plurality of microfine windows juxtaposed 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 each other by a fraction of the window height. In other words, although a thread in the transverse direction of the thread intersects a plurality of said microphone windows, in each case at different points along the vertical extent of the microphone windows.

In advantageous embodiments, 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.

Preferably, the window areas comprise micro-windows, the outlines of which comprise patterns, characters or an encoding, in particular a letter or digit. sequence, such as a currency symbol or a value number. In particular, with wide security threads, the micro-windows can also be designed in the form of a facial or portrait representation. In advantageous embodiments, the window areas comprise a plurality of microfine stars whose spatial arrangement forms a motif. The individual micro-windows are not necessarily formed even in motif form, but said motif is formed by the arrangement of the totality of micro-windows. Such a motif may consist in particular of letters, characters or figures which are composed of the micro-star stars as small building blocks. The outlines of the micro-windows can be the same and also different. It is also possible that both the outlines of the microphone windows and their spatial arrangement each represent a motif or information. These motifs or information can be related to each other or complement each other to form an overall information. The micro windows can also form screened, point cloud or strip 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 laterally projecting beyond the window security thread watermark. In this way, the microphone windows can be integrated into a comprehensive design of the data carrier, so that the attention value and the imitation security further increases. In particular, the watermark may supplement, continue or repeat in the same or modified form a motif formed by the outline or the spatial arrangement of the microfine windows.

According to another, likewise advantageous development of the invention, a motif formed by the outline or the arrangement of the micro-windows is continued by any other security feature beyond the window security thread. The other security feature may consist, for example, in a print layer, a color layer, a laser cut area, a watermark, a film or a hologram. Even with such an embodiment, the other security feature can complement a motif formed by the outline or the arrangement of the micro-windows, continue or repeat in the same or modified form.

The window security thread is advantageously 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.

The invention also includes a dewatering screen for the manufacture of security paper with a windowed security thread that on certain

Window areas on a surface of the security paper emerges and is embedded in intermediate areas inside the security paper. The dewatering screen comprises a carrier screen which is provided in an area with an injection molding insert which has a relief with motif elements which extend upwards from a base body and project beyond the surface of the carrier screen and which are formed in the form of the window areas of the window security thread. In this case, the motif elements comprise micromotif elements for producing microfine stars, which have a width, which is less than 50% of the thread width and lies between 0.2 mm and 4 mm, transversely to the running direction of the thread to be embedded.

The invention further includes a dewatering screen of the above-mentioned type, in which the dewatering screen comprises a carrier screen which is part of a rich has a Siebprägung having a relief with the surface of the support frame superior motif elements, which are formed in the form of the window areas of the window security thread. In this case, the motif elements comprise micromotif elements for producing microfine stars, which have a width, which is less than 50% of the thread width and lies between 0.2 mm and 4 mm, transversely to the running direction of the thread to be embedded.

In advantageous variants of the invention, the injection molding insert or the screen embossing comprises a plurality of micromotive elements lying next to one another transversely to the thread running direction for producing a plurality of microfine windows juxtaposed in the transverse direction of the thread.

In both designs of the dewatering screen, the motif elements preferably comprise micromotif elements whose outlines represent patterns, characters or an encoding, in particular a letter or number sequence. Alternatively or additionally, the motif elements comprise a plurality of micromotif elements whose spatial arrangement 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 producing the window regions of the window security thread, a watermark relief in the form of a watermark to be produced in the security paper. In particular, the watermark relief can supplement, continue or repeat in the same or modified form a motif formed by the outline or the arrangement of the micromotif elements. For drainage screens with injection molding this is expediently formed from a hydrophobic plastic, such as polyoxymethylene. To reduce wear during operation, the plastic may be added with wear-reducing additives.

The injection-molded insert is preferably arranged in a cut-out region of the carrier screen and connected thereto only in a preferably serrated edge region. For this purpose, for example by means of a laser cutting device at the location of the screen mesh, on which the injection molding insert is provided, a recess can be produced which is slightly smaller, for example 1/10 mm smaller than the desired shape of the injection molding insert. The edge region can be designed in particular in the form of a pattern, preferably in a serrated form. In this cut-out portion of the injection molding insert can be inserted or preferably injected.

The support screen advantageously comprises a screen fabric with at least one system of interwoven, longitudinally extending warp threads and weft threads extending transversely thereto, the screen fabric advantageously comprising 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 plastic fabric.

Furthermore, the injection molding insert preferably has a plurality of perforations, which ensure drainage during papermaking. The dimensions of these drainage perforations are chosen so small that they do not adhere to fibers during papermaking. Typical perforation diameters are between 100 μπι and some 100 μπι, for example, at about 500 μιη. Rejuvenate in advantageous embodiments the perforations to the top design surface of the injection molding insert or the perforations are formed waisted.

To produce an injection molding insert with an injection-molded 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-stage tool relief can be formed by milling or by an additive manufacturing process as a layer sequence of a plurality of firmly interconnected material layers.

To produce a screen embossing of the type described above, a stamping die can be used, which is provided with a high-resolution multi-level relief in the form of the inverted screen embossing. The embossing stick 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 firmly interconnected material layers.

As additive manufacturing processes are in particular selective laser sintering, selective laser melting, electron beam melting, 3D printing with powder, melt stratification, laser deposition welding, multi-jet modeling, a Polyjet method, stereolithography, Laminated Object Modeling, film transfer imaging or digital light processing into consideration.

Further details on the structure, properties and production of the injection molding tool or die 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 in this respect.

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

Show it:

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

2 and 3 each show a detailed representation of window areas with micro-windows of a banknote according to the invention in a plan view,

4 and 5 each show a schematic representation of a dewatering screen according to the invention, which is used for the production of micro-windows,

6 shows plan views of a banknote with a plurality of microfibers arranged in ensembles of microsymbols in the form of a rosymbol, wherein (a) a single ensemble of microsymbols and (b) a plurality of ensembles spaced apart in the longitudinal direction of the thread and staggered in the transverse direction of the thread from micro star shows, and a design in which the design of a series of papermill-made microfibres outside the security thread continues from a print pattern. The invention will now be explained using the example of window security threads for banknotes and other value documents. 1 shows a schematic representation of a banknote 10 with a paper substrate 12, which is provided with a window security thread 14 according to the invention. The window security thread 14 emerges in window areas 16 on the surface of the banknote 10, while it is embedded in the intermediate web areas 18 in the interior of the banknote 10.

In the illustration of Fig. 1, all window portions 16 of the window security thread 14 Scheme table are shown as rectangles. As shown in the detail of Fig. 2, the window portions 16 according to the invention include papermaking microfrench 20, which are formed in the embodiment in the form of transverse thread adjacent numerals "1" and "5", which together form the digit sequence "15" , When viewed from above, the microfibers 20 clear the view of 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, become 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 therefore the security features arranged thereon are not visible.

Since the micro-windows 20 were produced in papermaking, as described below, they have an edge 22 with characteristic irregularities, which in this description is often referred to as deckle edge. is drawn. The irregular edge structure arises from an irregular accumulation of fibers in the edge region and by protruding into the hole of individual fibers. The width bM of the micro window 20 is significantly smaller than the thread width bF, 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 mm) % of thread width, digit "5"). The height 1 IM of the microfine window 20, that is to say the extension in the longitudinal direction L of the thread, is approximately 2 mm and is therefore also substantially smaller than the window areas of conventional window threads. As usual, the direction parallel to the longitudinal extent of the security thread is referred to as the thread longitudinal direction L and the thread transverse direction Q is the direction perpendicular thereto. Another peculiarity of the designs according to the invention is that several micro-windows 20 can be juxtaposed in the transverse direction Q, in the embodiment of 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 are arranged in the form of small stars with irregular deckle edge 22 and a diameter of about bM = 1.5 mm at a distance of about 2 mm offset from each other. The micro-windows 20 reveal the view of the embedded in the paper window security thread 14, so that there its security features can appear. The size of the microfine window bM is significantly smaller than the thread width bF (bM = 0.375 bF), in addition, two partially micro-window 20 are arranged in the transverse direction Q side by side, but without lying exactly at the same height. It is understood that the banknote 10 can also have conventional window areas in addition to window areas with the described micro-windows 20. However, since these are known, will not be discussed in detail in the present application.

In order to produce designs such as the microfibre window 20 described in connection with FIGS. 2 and 3 in the region of a window security thread 14, according to the invention the drainage screen 30 shown schematically in FIG. 4 in a section transverse to the thread running direction is used.

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

In the cut-out portion 40 of the screen fabric 34, a plastic injection-molded insert 50 is arranged, which is connected at its edge to the screen fabric 34. In principle, the connection can be made in a variety of ways, for example by plastic overmolding or back-spraying, by means of a plurality of fastening knobs arranged along the edge, or by welding or gluing. In the embodiment, a presently preferred variant is realized in the the injection molding insert 50 is injected with a corresponding tool shape directly into the cut-out portion 40 of the screen fabric 34 and thereby enters into a particularly intimate connection with the screen fabric. The injection-molded 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 starting motif elements in the form of the window areas 16 extend upwards and project beyond the screen surface. It is essential for the present invention that the motif elements contain small micromotif elements 56, which are formed in the shape and size of the microfibres 20 and extend upwards with a sharp edge. In the exemplary embodiment, the relief 52 is produced by means of milling, so that the flanks 57 of the small micromotif elements 56 enclose an angle of approximately 15 ° with the surface normal.

In papermaking in a rotary screen paper machine, the security thread 14 to be embedded is supplied as an endless element from a spool via a deflection roller to the dewatering screen 30 with the injection molding insert 50. During immersion of the injection molding insert 50 into 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 a negative pressure prevails in the interior of the dewatering screen 30, the water of the water-fiber dispersion of the pulp is sucked into the interior of the dewatering screen. In the process, the fibers deposit on the surface of the dewatering screen 30 and the injection-molded insert 50 and form the desired paper web. At the locations where the security thread 14 rests on the motif elements or the micromotif elements 56, the security thread is attached to the drainage screen by the negative pressure. sucks, so that there can accumulate no fiber mass. Accordingly, the security thread 14 remains free of fiber material in the regions of the motif elements or of the microphoto elements 56, while paper fibers accumulate in the surrounding regions and embed the security thread 14 in the paper. The motif elements or the micromotif elements 56 therefore generate just the desired window areas or microfine windows 20 in the forming paper layer.

Because of the papermaking of the micro-windows 20, the edge region 22 of the micro-windows is not completely sharp, as in the case of subsequent production of holes by means of punching or laser cutting. Rather, 20 fibers are deposited in the edge region of the micro-window, which project into the opening in an irregular manner and thereby produce the characteristic deckle edge.

The extent of edge sharpness or edge blurring of the microfine window 20 can be predetermined by the three-dimensional shape of the micromotif elements 56. Micromotif elements, such as micromotif elements 56 of FIG. 4, which have very steep flanks 57 and a small edge width, produce marginal regions 22 with minor irregularities, while micromotif elements have flatter flanks and larger edge width, such as the micromotifs shown in FIG 58, micro-windows 20 with strongly irregular edge regions 22 produce. The edge width of a micromotif element is the width within which the height of a micromotif element falls from 90% of the maximum height to 10%. Micro-windows with only slightly irregular marginal areas can be created with micromotif elements 56 having a marginal width of 0.6 mm or less, 0.5 mm or less, or even 0.4 mm or less become. On the other hand, micromotif elements 58 with a marginal width of more than 0.6 mm, more than 1 mm or even more than 1.5 mm can produce microfibres with strongly irregular marginal regions 22. The injection molding insert 50 is further provided with a plurality of perforations 48 to ensure dewatering in papermaking also in the field of injection molding. The diameter of the perforations 48 is chosen so small that they do not adhere to fibers in papermaking. Typical perforation diameter are between 100 μη and some 100 μπι, for example, at about 500 μιτι.

Figures 6 and 7 show further advantageous embodiments of inventive micro windows in banknotes or other data carriers. In the embodiment of FIG. 6 (a), the micro-windows 20 are formed in the form of ovals having a dimension of 0.4 mm × 0.3 mm. In each case, a plurality of oval micro-star 20 forms an ensemble 24, the micro-windows 20 are arranged spatially to each other so that they form together as a motif the euro symbol "€". Although further shown in FIG. 6 (a), the ensemble 24 contains a plurality of micro-windows 20 adjacent to one another in the transverse direction of the thread. However, they are never exactly at the same height in the transverse direction of the thread but rather are always offset from each other by a fraction of the height of the micro-windows.

As in the embodiments described above, the micro-windows 20 release the view of the embedded in the paper window security thread 14 and let the security features arranged thereon, for example, formed by a print layer, a color layer or other functional layer visible. In the embodiment of FIG. 6 (b), a plurality of ensembles 24 of micro windows 20, each in the form of the euro symbol €, are arranged spaced apart in the thread longitudinal direction L. The ensembles 24 are offset as a whole in the transverse direction Q against each other something to compensate for variations in the introduction of the security thread 14 into the paper, for example, due to wobble. If Δ denotes the maximum distance by which a security thread 14 can be introduced into the security paper 12 in the transverse direction Q offset due to wobbling, it can be ensured by offsetting the Eurosymbol ensemble 24 up to a distance Δ to the right and left longitudinally always some complete symbol ensembles 24 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, for example in the form of a watermark or by another security feature. By way of illustration, Fig. 7 shows a design in which a series of papermaker-made microfibers 26 are disposed over a window security thread 14 and, as described above, reveal the security feature of the embedded window security thread 14. The circular disk-shaped micro window 26 have different sizes, but are all significantly smaller than the thread width, so that several micro windows 26 in the yarn transverse direction Q are adjacent. The design formed by the micro-star 26 is continued outside the security thread 14 of a printed pattern 28 in the form of a printed point cloud and thereby integrated into the overall design of the banknote 10. This also significantly increases the counterfeit security of the banknote since the security thread 14 is not replaced by a security thread without micro-security. Window 26 can be replaced and also because the security thread 14 must be aligned correctly in the longitudinal direction of the print pattern 28.

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

LIST OF REFERENCE NUMBERS

10 banknote

12 paper substrate

14 window security thread

16 window areas

18 land areas

20 micro windows

22 edge with characteristic irregularities

24 ensemble of micro star

26 microphone windows

28 print patterns

30 drainage screen

32 strainer

34 screen mesh

36 warp threads

38 wefts

40 cut out section

48 perforations

50 watermark insert

52 relief

54 basic body

56, 58 micromotif elements

57 flanks

L thread length direction

Q thread transverse direction

Claims

Patent claims

1. A data carrier, in particular value or security document, with a substrate comprising at least one paper layer, wherein in the substrate a window security thread is embedded, which is visible on at least one surface of the substrate in certain window areas, characterized in that the window areas papermaking produced micro-window having an edge produced in papermaking with characteristic irregularities and the width transverse to the thread direction is less than 50% of the thread width and is between 0.2 mm and 4 mm.

2. A data carrier according to claim 1, characterized in that the length of the micro window is parallel to the yarn longitudinal direction between 0.2 mm and 4 mm, preferably between 0.3 mm and 3 mm and more preferably between 0.5 mm and 1 mm, and / or that the width of the microfine window in the transverse direction of the thread is between 0.3 mm and 3 mm, preferably between 0.5 mm and 1 mm.

3. A data carrier according to claim 1 or 2, characterized in that the window areas comprise a plurality of adjacent in the transverse direction of the thread micro window.

4. A data carrier according to at least one of claims 1 to 3, characterized in that the width of the micro window in the transverse direction of the thread is less than 40%, preferably less than 30% of the thread width.

5. A data carrier according to at least one of claims 1 to 4, characterized in that the window areas comprise micro-windows whose outlines represent patterns, characters or a coding, in particular a letter or number sequence.

6. A data carrier according to at least one of claims 1 to 5, characterized in that the window areas comprise a plurality of micro-windows whose spatial arrangement forms a motif, in particular letters, characters or figures.

7. A data carrier according to at least one of claims 1 to 6, characterized in that the micro-windows as thin spots in the paper layer of the substrate are part of a laterally projecting beyond the window security thread watermark.

8. A data carrier according to at least one of claims 1 to 7, characterized in that a formed by the outline or the arrangement of the micro window motif is continued by another security feature on the window security thread addition.

9. A data carrier according to at least one of claims 1 to 8, characterized in that the window security thread with diffraction structures, liquid crystal layers, thin-film structures, recesses in opaque, especially metallic layers, fluorescent materials, magnetic, conductive and / or metallic layers is provided.

10. Drainage screen for the production of security paper with a window security thread, which, after being embedded, is visible 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 an area with an injection molding insert which has a relief with motif elements extending upwards from a base body and projecting beyond the surface of the carrier screen, which are formed in the form of the window areas of the window security thread and wherein the motif elements for the production of micro-windows comprise micromotif elements which have a width, which is less than 50% of the thread width and lies between 0.2 mm and 4 mm, transversely to the running direction of the thread to be embedded.

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 support screen having a Siebprägung in a partial area, which is a relief with the Surface of the support screen has superior motif elements, which are formed in the form of the window areas of the window security thread, and wherein the motif elements for generating micro-star micromotif elements comprise, which have transverse to the direction of the thread to be embedded, a width which is less than 50% of the thread width and between 0 , 2 mm and 4 mm.

12. dewatering screen according to claim 10 or 11, characterized in that the injection molding insert or the Siebprägung several, transverse to the Fennlaufrichtung adjacent micro-motive elements comprises.

13. Entwässerungssieb according to one of claims 10 to 12, characterized in that the motif elements comprise micromotif elements whose outlines patterns, characters or a coding, in particular a book represent the sequence of characters or numbers, and / or that the motif elements comprise a plurality of micromotif elements whose spatial arrangement forms a motif, in particular letters, characters or figures.

14. Entwässerungssieb according to at least one of claims 10 to 13, characterized in that the injection molding insert or the Siebprägung next to the motif elements for generating the window areas of the window security thread has a watermark relief in the form of a security paper to be generated in the watermark.

15. Entwässerungssieb according to at least one of claims 10, 12 to

14, characterized in that the injection-molded insert is arranged in a cut-out region of the carrier screen and is connected to it only in a preferably serrated edge region.

16. Drainage screen according to at least one of claims 10, 12 to

15, characterized in that the injection molding insert has a plurality of perforations whose dimensions are so small that they do not adhere to fibers in the papermaking.