CN114127362A

CN114127362A - Method for producing security paper and security paper obtainable thereby

Info

Publication number: CN114127362A
Application number: CN202080052049.5A
Authority: CN
Inventors: M.阿尔布斯; B.托伊费尔; V.津思; R.西格尔; B.维德纳; A.格罗斯
Original assignee: Giesecke and Devrient GmbH
Current assignee: Giesecke and Devrient GmbH
Priority date: 2019-08-07
Filing date: 2020-08-05
Publication date: 2022-03-01
Anticipated expiration: 2040-08-05
Also published as: EP4010199A1; WO2021023399A1; DE102019005551A1; CN114127362B

Abstract

The present invention relates to a security paper having: a flat extending substrate (8) which is continuous in at least one section (10) and has an uninterrupted front side and an uninterrupted rear side (12, 14) there, and-a stabilizing coating (22, 28) applied on the rear face (14) in the section (10), wherein the security paper also has a carrier-free transfer element (16) applied to the front side (12) in the section (10), the transfer element is bounded inside the substrate (8) by at least one edge (18), and wherein the stabilizing coating (22, 28) and the unsupported transfer element (16) are dimensioned and arranged such that, such that, when the planar substrate (8) is viewed in plan, the stabilizing coating (22, 28) i) covers more than 50% of the area of the transfer element (16) and/or ii) extends beyond the edge (18) of the transfer element (16).

Description

Method for producing security paper and security paper obtainable thereby

The invention relates to a method for producing security paper, comprising the following steps: providing a flat, extended substrate which is continuous in at least one section and has an uninterrupted front side and an uninterrupted rear side, and applying a stabilizing coating to the rear side in the section. The invention also relates to a security paper having: a flat extended substrate, which is continuous in at least one section and has an uninterrupted front side and an uninterrupted rear side, and a stabilizing coating applied to the rear side in the section.

A production method of the type according to the invention and a security paper of the type according to the invention are known from patent document WO 2014/095039 a 1. Said patent document specifies a stabilizing coating for continuous, i.e. windowless, sheets. The stabilizing coating is here designed as a circumferential strip on the edge of the paper sheet. The stabilizing coating can be provided on the front side and/or the rear side and should improve the properties of the sheet without openings in the printing process.

EP 2461970B 1 describes a method for producing a security paper and a security paper obtainable thereby, wherein a film-covered window opening is provided. For stabilization, a stabilizing coating is provided around this opening.

The object of the invention is to improve the processability of a base paper without openings when a transfer element is arranged on the front side.

The invention is defined in the independent claims. The dependent claims relate to preferred further developments.

In the production method, a flat extended substrate is provided. The substrate has no opening in at least one section, i.e. the substrate is continuous and has an uninterrupted front side and an uninterrupted back side in this section. The terms "front side" and "back side" are used herein for distinction only and should not denote a preference for one of the two major sides of the substrate. A carrier-free transfer element is applied to the front side of the substrate. The unsupported transfer elements have no carrier layer of their own, i.e. in particular no film layer of their own. The transfer element is in a section of the substrate that does not have an opening. The transfer element has at least one edge which is in the (extended) interior of the substrate, i.e. not coinciding with an edge of the substrate. A stabilizing coating is applied to the opposing back surface. The stabilizing coating is designed in such a way that, when the planar substrate (8) is viewed in plan view, the stabilizing coating

i) Covering more than 50% of the area of the transfer element (16), but preferably less than 98%, and/or

ii) extends beyond the edge (18) of the transfer element (16).

The processability and the flatness of the security substrate thus obtained are improved by the stabilizing coating. In addition, the flatness is improved according to the following process, especially the engraved intaglio printing.

This is surprising, since it seems disadvantageous firstly that additional thickening is also produced by the stabilizing coating in the region of the transfer element which itself already leads to thickening of the substrate. It has however been demonstrated in a surprising manner that the smoothness and processability of the base paper are improved by the stabilizing coating.

The stabilizing coating is applied only locally, i.e. not over the entire back side of the substrate. Thus, the stabilizing coating is also referred to as a local stabilizing coating. The stabilizing coating is arranged in particular adapted to the edge of the transfer element.

The stabilizing coating is preferably present continuously or in sections. The stabilizing coating may cover the area of the transfer element continuously or in sections and/or extend beyond the edge of the transfer element continuously or in sections. A continuous coating may also be referred to as a full-face coating. The coating is in particular free of interruptions or recesses. Conversely, if the coating has one (or more) recess (es), it is present in sections. If the coating has one or more interruptions, it is likewise present in sections in a plurality of sections. The segments themselves are each designed in their entirety.

In this and all the following paragraphs, the description always refers to a planar substrate viewed from above, as long as the description explicitly refers to the contrary without exception. If the stabilizing coating is present continuously, three variants can be distinguished basically. In a first (preferred) variant, the stabilizing coating covers 100% of the area of the transfer element and extends beyond the edges of the transfer element. Alternatively, the stabilizing coating covers more than 66% and less than 98%, preferably less than 95%, further preferably less than 90% of the area of the transfer element. According to a third, less important variant, the stabilizing coating covers exactly the transfer element (100%). The stabilizing coating thus extends only to the edges of the transfer member.

In an advantageous embodiment, the stabilizing coating covers the edges of the transfer element and the strip-shaped portions on both sides of the edges, respectively, when the flat substrate is viewed in plan. If the continuous stabilizing coating extends beyond the edge of the transfer element, the strip of the back side of the substrate that is adjacent outside the circumferential edge of the transfer element and that surrounds the transfer element is covered. In this embodiment, the stabilizing coating covers the entire surface of the transfer element. That is to say the stabilizing coating covers the transfer element over its entire surface and is, for example, of larger design, so that the edge-side strips (or strip-shaped parts) of the transfer element are also covered. As already explained, the stabilizing coating does not cover the entire back side of the substrate. Instead, the stabilizing coating only extends beyond the edges of the strip. The width of the strip (or of the excess) is preferably not more than 10mm, particularly preferably not more than 5mm, and very particularly preferably in the range between 1mm and 5mm or between 1mm and 2.5 mm.

If the stabilizing coating is present in segments, the following variants can be distinguished essentially:

exactly one section with a circumferential outer edge for the transfer element, or

Having exactly one section for each edge of the transfer element, or

-having a plurality of sections.

The stabilizing coating preferably completely covers the edges of the transfer element, in particular as a continuous stabilizing coating or as a stabilizing coating having exactly one section for the circumferential edge of the transfer element or for each edge of the transfer element.

In this case, it may be sufficient in the design to cover only the edges of the transfer element in such a way that only one strip is covered on both sides of the edge. If the transfer element is designed as an elongate transfer strip which extends continuously over the longitudinal length of the security substrate, the transfer element thus has two edges in the relevant section of the substrate. The stabilizing coating may thus have the shape of two strip-shaped sections, wherein each section covers one edge. Conversely, if the transfer element is designed as a so-called "patch", the stabilizing coating can be designed frame-like, wherein the frame width and the dimensions are selected such that only the edges of the patch are covered on both sides. In this embodiment, the stabilizing coating covers 95% or less, preferably 66% or less, and more preferably 33% or less of the area of the transfer element. In particular between 5% and 66%, preferably between 5% and 33%, of the area of the transfer element is covered. The stabilizing coating, which covers only one strip on each side of the edge, has in particular a width (frame width of the two sections or strip width) of less than 20mm, preferably less than 10mm, particularly preferably between 2 and 10mm or between 2 and 5 mm.

In a further advantageous embodiment, the stabilizing coating comprises a plurality of segments, which are arranged, in particular, at a distance from one another. The segments preferably cover less than 95%, in particular less than 90%, of the area of the transfer element, more preferably more than 50% of the area. The stabilizing coating is continuously (or globally) inside the segment. As an alternative to the spaced arrangement of the segments, a mesh arrangement of the segments can be considered, in which the segments are partially connected to one another.

The segments have an outer shape, such as rectangular, square, oval or triangular, by way of example only. The section has its largest dimension (e.g., length, width, or diameter) in one direction. It is only preferred that this maximum dimension of the section corresponds to the corresponding dimension of the entire coating (i.e. length/width/…). If the transfer element has its maximum extension (e.g. length or width) in the first direction, the maximum dimension of the segments is preferably in a second direction (e.g. width or length) which has an angle of more than 60 degrees, preferably more than 75 degrees, with respect to the first direction, particularly preferably perpendicular (90 degrees) to the first direction. In other words, the preferred direction of the segments is preferably arranged perpendicular to the preferred direction of the transfer element.

The plurality of segments may be formed by segments having the same maximum dimension and/or the same outer shape. The segments may, for example, be uniformly rectangular or square. The maximum dimensions (or sizes) of the segments are preferably the same. The segments may for example be present as rectangles (or squares) of uniform size. Alternatively, the plurality of segments may be formed by segments having the same maximum dimension and different external shapes. The segments may be arranged, for example, in equilateral triangles of uniform size but oriented differently, or acute-angled triangles, rectangles, or ovals. Further alternatively, the segments may differ in their maximum size with the same outer shape. Uniformly shaped segments, such as rectangles or triangles, may have different first and second maximum dimensions. Finally, the first and second sections may differ in both external shape and maximum size.

The segments preferably extend with a dimension which is between 75% and 200% of the corresponding (local) dimension of the transfer element. Such a section may be referred to as a size-adapted section. In a first variant, said dimension is between 75% and 95% of the corresponding dimension of the transfer element. The section preferably ends before the edge of the transfer element. Alternatively, the length of the segments is between 95% and 105% of the respective (local) dimension of the transfer element. The section thus ends near the edge. Preferably, the segments of the stabilizing coating extend in a length of between 105% and 200%, preferably 110% and 175%, of the respective dimension of the transfer element. As is always seen in plan view, the stabilizing coating covers the edge in sections (no longer over its entire surface).

In other embodiments, the segments each have an area which is less than 1% of the area of the transfer element and/or a dimension which extends in any direction which is not greater than 33%, in particular not greater than 20%, further preferably not greater than 10% of the respective dimension of the transfer element. Such a section can be used as a size-independent section independent of the size of the transfer element.

The stabilizing coating advantageously extends beyond the edges of the transfer element by less than 50%, preferably less than 33%, of the area of the transfer element. The stabilizing coating advantageously extends (in each direction) beyond the edge of the transfer element by not more than 10mm, further preferably by not more than 5mm, particularly preferably in the range from 1mm to 5mm, very particularly preferably in the range from 1mm to 2.5 mm.

The stabilizing coating is not a self-supporting layer, for which in particular lacquers, in particular UV-curing lacquers, can be used. Water-based paint systems may be considered. In an embodiment, the stabilizing coating is colorless and optionally matches in its extinction the gloss of the base paper according to gravure printing. The stabilizing coating preferably comprises only a single layer and alternatively only exactly two partial layers lying one above the other. The stabilizing coating may contain matting agents, luminescent substances and/or effect pigments. UV absorbers can be added to simplify monitoring and prevent yellowing when applying the stabilizing coating. The lacquer may also contain no matting agent (or additionally) pearlescent pigments as effect pigments. Furthermore, the lacquer may contain dyes or luminescent substances.

It is also possible by means of the stabilizing coating to significantly reduce or prevent deformations of the base paper, such as the formation of grooves or elevations, in particular in intaglio printing.

The stabilizing coating preferably not only has a direct mechanical stabilizing effect, but also prevents moisture from entering the substrate. The stabilization coating thus also prevents or reduces the deformation of the security paper, in particular during rewetting or reprocessing.

Coating agents mentioned in EP 2461970B 1 for other applications are particularly considered.

The stabilizing coating can be applied by a printing method, in particular by gravure printing, flexographic printing, screen printing, offset printing or thermal transfer printing.

Suitable pearlescent pigments are mentioned inter alia in EP 2461970B 1. Other effect pigments, i.e. optically variable pigments, are sufficiently known, for example interference layer pigments, effect pigments, color-variable and/or magnetically orientable pigments.

The transfer element (transfer element) is preferably a carrier-free transfer element. In particular, carrier-free transfer elements which do not comprise a film of their own are known and are usually detached from a temporary transfer carrier when transferred onto a substrate.

Transfer tapes and transfer patches are known in particular as transfer elements. The transfer tape extends entirely over the substrate in one direction. Accordingly, the transfer tape has two edges (according to the invention). The transfer patch is arranged inside the substrate and thus has a surrounding edge. Alternatively, the transfer patch may comprise a central recess and thus additionally have an inner edge. As previously mentioned, only the edge of the transfer element that is inside the substrate is the edge according to the invention. The base extends on both sides of the edge. The edge may also be referred to as an inner edge of the transfer element. If the security paper is present as a security paper web or as a security paper sheet, it comprises a plurality of individual copies (Einzelnutzen) for security documents. In the security paper web, a first number of individual copies, for example 4 to 8, is defined, which are arranged next to one another in the width of the web. But in turn any number of individual copies, in particular a second number of hundreds or thousands of individual copies, in the length of the web. In the security sheet, a first defined number, for example 4 to 8 individual copies, lie side by side in the width of the page and in succession in the length of the page have a second defined number, for example 5 to 10 individual copies. Each individual copy has at least one of the sections of the substrate with one of the covered transfer elements, in particular each individual copy has at least one covered transfer patch and/or each individual copy has a covered transfer strip section of a security paper web or a security paper sheet transfer strip. The security paper web/security paper sheet can also comprise an outer area in addition to the central area with the individual copies. The transfer patches forming the stripe shape for each individual copy of the transfer stripe section may terminate in an outer region, i.e. inside the substrate. After dividing the central area into separate copies, the outer areas, which are only temporarily used, are usually removed.

It is advantageous to first apply the stabilizing coating and optionally actively harden it, for example by means of UV radiation, IR radiation and/or electron radiation and/or heating, and then apply the transfer element. Thus, the stabilizing coating can already positively influence when applying the transfer element. Alternatively only, the stabilizing coating may also be applied after the transfer element is applied.

The transfer element is generally fixed to the substrate at the time of application by means of an adhesive layer, preferably one that can be activated thermally. In an advantageous embodiment, an adhesion-promoting layer, such as a primer layer, is applied (in the transfer region) before the transfer element is applied. The adhesion-promoting layer is located between the substrate and an adhesion layer by which the transfer element is fixed to the substrate.

The invention also relates to a security paper having a flat elongate substrate which is continuous in at least one section and has an uninterrupted front side and an uninterrupted rear side. A stabilizing coating is applied to the rear side in the section. Furthermore, a transfer element is applied to the front side in the section, said transfer element having at least one edge, said edge being located within the extension of the substrate. The stabilizing coating covers more than 50% but preferably less than 98% of the area of the transfer element when the planar substrate is viewed in plan view, and/or the stabilizing coating extends beyond the edges of the transfer element when the planar substrate is viewed in plan view.

The properties and characteristics of the security paper mentioned above in connection with the production method are of course also applicable to the security paper.

The substrate may be a substrate designed as one or more layers. The substrate is preferably a paper substrate. Optionally, the substrate is provided with a plastic film, in particular after said step. Any type of paper, in particular paper made of cotton, can be considered as paper. It is of course also possible to use paper comprising portions of plastic material, for example polymer material.

Security paper can be used in particular for producing security documents, in particular bank notes. The security document is therefore likewise the subject matter of the invention according to the appended claims.

The invention is explained in more detail below with reference to the figures, which also disclose important features of the invention, according to embodiments. These examples are for illustration only and are not intended to be limiting. For example, a description of an embodiment with multiple elements or components does not imply that all such elements or components are necessary for implementation. Other embodiments may also include alternative, fewer, or additional elements or components. Elements or components of different embodiments may be combined with each other as long as not otherwise specified. The modifications and variations described for one of the embodiments can also be applied to the other embodiments. To avoid repetition, identical or corresponding elements are denoted by the same reference numerals in the different figures and are not explained more than once. In the drawings:

figure 1 shows a schematic view of a security paper having two transfer elements serving as security features,

figure 2 shows a cross-section through the security paper in the region of one of the transfer elements,

fig. 3 shows a schematic view similar to fig. 1, illustrating the relative positions of the stabilizing coating and the transfer element,

FIG. 4 shows further schematic diagrams for illustrating further embodiments of the stabilizing coating and the relative position of the transfer element and

fig. 5 and 6 show views similar to fig. 2 and 3 for a modified embodiment.

Fig. 1 shows schematically in a top view a security paper 2, a precursor of a banknote, for example, or a banknote. The security paper 2 comprises two transfer elements, namely a strip-shaped transfer element 4 and a patch-shaped transfer element 6. These transfer elements are applied to the main side of the security paper 2. The transfer element comprises at least one optically or otherwise identifiable security feature which improves the security of the security paper 2 or the banknote. Transfer elements without their own carrier layer are used here. The security paper can be present as a sheet or web and can be divided into its individual copies, such as banknotes, in which only one of the individual copies is observed in each case in the figures. In principle, two

transfer elements

4, 6 are drawn to illustrate that the embodiment can be applied identically to different transfer elements. The solution described here can be applied in particular to a continuous strip, for example an elongated transfer element 4, which has exactly two edges as a transfer element, or also to a patch-shaped transfer element 6 having a circumferential edge.

Fig. 2 schematically shows a cross-section of the security paper 2 cut in the region of one of the transfer elements. It is not important here to show which of the

transfer elements

4, 6 is used, since the principle explained applies equally to both transfer elements. In fig. 2, it can be seen that the security paper 2 has a substrate 8 which, at least in a section 10, has no through-openings, i.e. no windows, i.e. in this section 10, has a continuous front side 12 and a continuous rear side 14. This of course does not exclude the possibility of the substrate 8 having windows in other sections. A transfer element, here indicated with reference numeral 16, is applied on the front side 12. The transfer element has at least one edge 18 at which the transfer element 16 ends, but the substrate 8 lying therebelow continues along its face extension. The transfer element 16 thus has an extension covering the first area 20. The transfer element is entirely inside the section 10 without windows.

A stabilizing coating 22 is applied to the opposite rear side 14, said stabilizing coating covering a second region 24 on the rear side 14, said second region being larger than the first region 20. Thus, the stabilizing coating 22 extends beyond the edge 18 in a top view (e.g., as viewed from above in fig. 2). There is a strip 26 of stabilizing coating 22 which extends beyond the edge 18. The stabilizing coating 22 simultaneously also covers the edge 18 in top view and also the strip covering the side of the edge 18, i.e. inside the transfer element 16, is seen in top view. In the embodiment of fig. 2, this is achieved in that the extent of the second region 24, i.e. of the stabilizing coating 22, is greater overall than the extent of the first region 20, i.e. of the transfer element 16.

The cover achieved thereby is shown in fig. 3, fig. 3 schematically showing the mentioned top view. The stabilization coating 22 is drawn here in dashed lines in its outline. As can be seen, the stabilizing coating covers the transfer element in plan view both when the transfer element is designed as a strip-shaped transfer element 4 and when the transfer element is designed as a patch-shaped transfer element 6.

The complete covering of the edge 18, i.e. the strip 26 of the stabilizing coating 22 extending beyond the edge 18, significantly improves the processability and in particular the flatness of the security paper 2. This is advantageous in particular in the subsequent intaglio printing on the front and/or

rear side

12, 14.

In this case, the stabilizing coating 22 does not necessarily have to cover the entire surface of the transfer element 16, as is shown in fig. 2 and 3.

Fig. 4 shows a design in plan view, in which the stabilization coating 22 comprises a plurality of segments 42. The segments 42 are preferably arranged at regular distances from one another. The surface of the transfer element is no longer completely covered, but only to a certain extent, for example 90%, by the stabilizing coating.

The width of the section 42 arranged below the transfer strip 4 is adapted to the width of the transfer strip 4. The section extends with its length over the width of the transfer strip and in the embodiment shown also extends beyond the transfer strip and is for example between 10% and 100% longer than the width of the transfer strip.

The segments 42 need not be oriented in a certain direction. They may also extend, for example, at an angle of 45 or 60 (instead of 90) degrees with respect to the transfer tape 4. However, the segments 42 each extend over at least 75% of the respective dimension of the transfer tape (in this direction and at this location). Irregularly wide transfer bands 4 are for example conceivable and known.

The transfer patch 6 shown in fig. 4 now also has a central recess, which therefore has an outer edge and an inner edge. The now annular surface of the transfer patch 6 is also covered by more than 75% of the partial sections 42 of the stabilizing coating 22. It can be seen that the width of the sections 42 is adapted to the local width of the transfer patch 6. The height of the section 42 is greater than its distance, in particular greater than 2 mm. Furthermore, the segments 42 are arranged in such a way that the edges of the transfer element are well covered, in part, by more than 66%, preferably more than 75%. The function of the selected arrangement can be understood particularly well by way of example of the inner edge, since other arrangements may obviously lead to the inner edge being largely uncovered.

In each section 42, as in the previously described embodiments, the stabilizing coating is present continuously. The section 42 is shown in fig. 4 as a rectangular section, but can also be designed differently, for example rounded and/or with a wave-shaped contour. In an alternative not shown, the rectangular section 42 may be formed, for example, by two partial rectangles of different sizes (two-thirds of the length/one-third of the length) or by two or more complementary triangles (separating the illustrated rectangles along their diagonals). Spaced segments are shown, wherein the segments may optionally also be connected to each other locally. Other conceivable embodiments having sections of the same or different dimensions and/or the same and/or different outer shapes are not shown separately in the figures.

In other embodiments described with reference to fig. 5 and 6, it is sufficient that the edge 18 is covered by a strip that covers not only the edge 18 itself, but also the strip 26 on the other side of the edge 18, and also the strip of preferably the same size on this side of the edge 18. Fig. 5 again shows a cross section. The stabilizing coating 28 is present in a certain width under the edge 18, but not under the entire transfer element 16. The stabilizing coating 28 is thus, as shown in the top view in fig. 6, for example, designed in the form of a frame (in the case of a patch-shaped transfer element 6) or in the form of two strips, i.e. formed from two

sections

28a, 28b, as is explained in fig. 6 for the strip-shaped transfer element 4.

To produce the security element, the stabilizing

coating

22, 28a, 28b is preferably applied (and hardened) prior to the application of the transfer element 16 in the production process. The materials and application techniques used in the general description of the specification may be used herein.

List of reference numerals

2 anti-counterfeiting paper

4. 6, 16 transfer element

8 base

10 section

12 front side

14 back side

18 edge

20 first region

22. 28, 28a, 28b stabilizing coating

24 second region

26 strips

42 segments of stabilizing coating

Claims

1. A method for producing security paper (2), having the following steps:

a) providing a flat extended substrate (8) which is continuous in at least one section (10) and which has an uninterrupted front side and an uninterrupted rear side (12, 14) in the section (10); and is

b) Applying a stabilizing coating (22, 28) on the back side (14) of the substrate (8) in the section (10);

c) applying a carrier-free transfer element (16) to the front side (12) of the substrate (8) in the section (10);

wherein, when the planar substrate (8) is viewed in a plan view

-the carrier-free transfer element (16) is present as a face and is bounded by at least one edge (18) inside the substrate (8), and

-the stabilizing coating (22, 28) and the unsupported transfer element (16) are dimensioned and arranged in such a way that the stabilizing coating (22, 28)

i) Covering more than 50% of the area of the transfer element (16), and/or

ii) extends beyond the edge (18) of the transfer element (16).

2. The method as claimed in claim 1, characterized in that the stabilizing coating (22, 28) is present continuously or in sections, in particular continuously or in sections, covering the area of the transfer element (16) and/or extends continuously or in sections beyond the edge (18) of the transfer element (16).

3. Method according to claim 1 or 2, characterized in that the stabilizing coating (22, 28) is present continuously and, when the flat substrate (8) is viewed from above

a) Covers 66% or more and 98% or less of the area of the transfer element (16); or

b) Covers 100% of the area of the transfer element (16) and extends beyond the edge (18) of the transfer element (16).

4. A method as claimed in claim 3, characterized in that the stabilizing coating (22, 28) extends beyond the edge of the transfer element when the planar substrate (8) is viewed in plan, wherein a strip (26) surrounding the transfer element, which adjoins the rear side of the substrate outside the circumferential edge (18) of the transfer element (16), is covered.

5. The method as claimed in claim 1 or 2, characterized in that the stabilizing coating (22, 28) is present in sections, in particular

Having exactly one section for each edge of the transfer element, or

-having a plurality of sections.

6. The method as claimed in claim 5, characterized in that, when the flat substrate (8) is viewed in plan, the stabilizing coating (22, 28) covers the respective edge (18) of the transfer element (16) in exactly one section and the adjacent strips (26) on both sides of the respective edge (18).

7. Method according to one of claims 1, 2, 5 or 6, characterized in that the stabilizing coating is designed as a strip (28a) or a frame (28) covering the edge (18) when the flat substrate (8) is viewed in plan view, wherein the stabilizing coating preferably has exactly one strip (28a) or frame (28) per edge (18) of the transfer element (16) located inside the substrate (8) and/or covers more than 50% and less than 75% of the area of the transfer element (16).

8. The method according to one of claims 1, 2 or 5, characterized in that the stabilizing coating (22, 28) comprises a plurality of segments which are preferably arranged at a distance from one another.

9. The method of claim 8, wherein the plurality of segments collectively cover more than 50% but less than 95% of the area of the transfer element (16).

10. The method of claim 8 or 9, wherein said plurality of segments are formed by:

-segments having the same maximum size and/or the same outer shape,

-segments having the same maximum dimension and different external shapes,

sections with different maximum dimensions and/or the same outer shape, or

-segments having different maximum dimensions and/or different outer shapes.

11. The method according to one of claims 8 to 10, wherein the segments extend in a direction having a maximum dimension which is between 75% and 200%, preferably between 75% and 95%, between 95% and 105% or between 105% and 200% of the corresponding dimension of the transfer element.

12. The method according to one of claims 8 to 10, characterized in that the segments are each smaller than 1% of the area of the transfer element and/or extend in any direction with a dimension not greater than 33%, in particular not greater than 20%, further preferably not greater than 10% of the corresponding dimension of the transfer element.

13. The method according to one of the preceding claims,

the transfer element (16) is a transfer strip (4) extending continuously over the longitudinal length of the substrate (8) and having two edges lying inside the substrate (8), or the transfer element (16) is a transfer patch (6), in particular having a circumferential outer edge lying inside the substrate (8) or having a circumferential outer edge lying inside the substrate (8) and at least one inner edge lying inside the substrate (8).

14. The method according to one of the preceding claims, wherein,

-after step c), the substrate (8) is printed on the front side (12) and/or the back side (14) with an engraved intaglio printing method; and/or

Before step c) of applying the transfer element, a step b) of applying a stabilizing coating is carried out, wherein the stabilizing coating is actively hardened, preferably in a hardening step before application; and/or

-applying an adhesion-promoting layer on the substrate before step c) of applying a transfer element comprising an adhesion layer.

15. A security paper, the security paper having:

-a flat extended substrate (8) which is continuous in at least one section (10) and has an uninterrupted front side and an uninterrupted rear side (12, 14) there, and

a stabilizing coating (22, 28) applied on the back side (14) in the section (10),

characterized in that the anti-counterfeiting paper also comprises

-a carrier-free transfer element (16) applied to the front side (12) in the section (10), which transfer element, when the planar substrate (8) is viewed in plan view, is

Is bounded by at least one edge (18) and is present as a surface within the base (8), and

the stabilizing coating (22, 28) and the transfer element (16) are dimensioned and arranged in such a way that, when the planar substrate (8) is viewed in plan view, the stabilizing coating (22, 28)

i) Covering more than 50% and preferably less than 98% of the area of the transfer element (16), and/or

ii) extends beyond the edge (18) of the transfer element (16).

16. A security paper as claimed in claim 15 characterised by one or more of the features of claims 2 to 14.

17. The method of claim 15 or 16, wherein the stabilizing coating (22, 28)

Is a lacquer layer, preferably made of actively hardenable lacquer, and/or

Appear transparent, and/or

-comprising a luminescent substance and/or a matting agent and/or an effect pigment.

18. The security paper according to one of claims 15 to 17, characterized in that the security paper is present as a security paper web or as a security paper sheet and has a plurality of individual copies for security documents, wherein each individual copy has in each case at least one of the sections of a substrate with one of the mentioned covered transfer elements, in particular each individual copy has at least one covered transfer patch and/or each individual copy has a covered transfer strip section of a transfer strip of the security paper web or security paper sheet.

19. Security document, in particular a banknote, having a security paper (2) according to one of claims 15 to 17.