DE102019006890A1 - Manufacturing process for a security paper and security paper obtainable therewith - Google Patents

Abstract

The invention relates to a method for producing a security paper which has the following steps: providing a flatly extended substrate (2) which has a front (11) and a rear (15), applying a transfer element (6; 8) to the front (11), which is delimited by at least one edge, and applying a stabilization coating (7; 10) to the rear side (15) in a section of the substrate which covers the transfer element (6; 8) in plan view, the stabilization coating ( 7; 10) is applied in such a way that the section has at least two surface sections which differ from the stabilization coating (7; 10) with regard to an appearance that can be perceived or measured from the rear (15).

Description

The invention relates to a method for producing a security paper which has the following steps: providing a flatly extended substrate which has a front and a rear side, applying a transfer element to the front side, which is delimited by at least one edge, and applying a stabilizing coating the back in a portion of the substrate that covers the transfer element in plan view.

The invention further relates to a security paper which has: a planar substrate with a front and a back, a transfer element on the front that is delimited by at least one edge, and a stabilizing coating on the back in a section of the substrate that has the Transfer element covered in plan view.

The WO 2011/015622 A1 describes a generic method for producing a security paper and a security paper.

It is also known not to print a stabilizing coating on the back, but rather to transfer a second film-based transfer element to the back.

The EP 1727684 B2 discloses a security and / or value document. The WO 2004/024464 A1 concerns a reinforced security document. From the EP 2411232 B1 and the EP 2860040 B1 further security elements and manufacturing processes for this are known.

The invention is based on the object of improving a substrate paper when a transfer element is provided. This applies in particular to forgery-proof and processability.

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

In the manufacturing process, a flat substrate is provided. The substrate has a front side and a rear side. The terms “front side” and “rear side” are used here only to distinguish and are not intended to mean any preference for one of the two main sides of the substrate. A transfer element is applied to the front side of the substrate. The transfer element has at least one edge which lies within the longitudinal extent of the substrate, that is to say does not coincide with an edge of the substrate. A stabilizing layer is applied to the opposite rear side. The stabilization coating is applied to the rear side in a section of the substrate in such a way that it covers the transfer element in the plan view of the substrate. The section of the substrate thus also covers the transfer element, in particular its edge. The section also has at least two surface sections. The stabilization coating is designed in different ways on these two surface sections. The stabilization coating has a different appearance on the two surface sections from the rear.

The term “appearance” refers to how the stabilizing coating can be perceived from the rear. Perception can take place optically, i.e. by looking at it. It can also be implemented by machine, for example by measuring different infrared properties, magnetic properties, etc.

The stabilization layer improves the processability and flatness of the security substrate obtained in this way with subsequent processes, in particular with intaglio printing. This is surprising insofar as it initially appears counterproductive to generate an additional thickening by the stabilizing coating in the area of the transfer element, which in itself results in a thickening of the substrate. Nevertheless, it has surprisingly been found that the stabilization coating improves the flatness and processability of the substrate paper.

The stabilization coating preferably extends - as seen in plan view of the flat substrate - as far as the edge of the transfer element and can in particular cover it. Optionally, it is not applied over the entire surface of the back of the substrate, e.g. delimits an inner part of the transfer element when viewed from above. However, the stabilization coating is preferably provided over the entire surface of the two surface sections of the substrate.

It is sufficient in embodiments to cover or cover only the edge 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 elongated strip which extends over a longitudinal extent of the security substrate, the transfer element consequently only has two edges within the relevant section of the substrate. The stabilizing coating can then have the form of two strips, each of which covers an edge. If, on the other hand, the transfer element is designed as a so-called “patch”, the stabilization coating can be designed in the form of a frame, the frame width and dimensions being selected so that the edge of the patch is covered. In other embodiments, the stabilization coating completely covers the transfer element and is designed somewhat larger, so that a strip beyond the edge of the transfer element is also covered. It is therefore advantageous for all variants that the stabilization coating does not cover the entire surface of the rear side of the substrate, but only protrudes over the edge of the transfer element by the strip already mentioned at the beginning. The width of this overhang (over the edge or over each edge) is preferably not more than 10 mm, particularly preferably not more than 5 mm, very particularly preferably it is in the range between 2 mm and 4 mm.

In a preferred embodiment of the invention, the surface sections of the substrate have the stabilization coating due to different printing or coating. The stabilization coating is thus applied by printing or coating. In addition, coatings that differ in appearance but have the same stabilizing effect are applied to the two surface sections.

The stabilization coating has at least one first coating section and at least one second coating section. The first coating section lies in the first surface section and the second coating section in the second surface section. A multiplicity of first or second coating sections can lie in the first and / or the second surface section. The first (s) and second (s) coating sections differ in their appearance, for example in the perceptible color. The first and second coating sections, however, have the same stabilizing effect, that is to say in particular also the same layer thickness.

The coating sections are preferably applied adjacent to one another or at a distance from one another. An overlapping arrangement, on the other hand, would only be theoretically conceivable, since otherwise the thickness of the coating sections would add up.

The coating sections are preferably applied over the entire area. The coating is then continuous in the coating sections. Coating sections applied over part of the area are conceivable. For example, a grid or a network could be used as a partial surface coating section. The area coverage of the coating in the partial coating sections will be greater than 30%, preferably greater than 50%, but less than 75%.

If the relative area coverage of the stabilization coating on the substrate is considered, it is above 50%, preferably above 66% and more preferably above 75% and in each of the cases further preferably below 98%. The coating sections are preferably formed over the entire area. If all full-area coating sections are arranged without any gaps, there is 100% relative area coverage. In preferred configurations with the aforementioned surface coverages, the coating sections are designed over the entire surface and spaced apart from one another.

Lacquers in particular, particularly UV-curing lacquers, can be used as the stabilizing coating. There are water-based paint systems in question. The stabilization coating is a non-self-supporting (carrier-free) layer. In contrast to a film-based transfer element, it cannot, for example, span a window in the substrate.

The stabilization coating ensures that deformation of the substrate paper, for example the formation of grooves or bulging, is significantly reduced or prevented, particularly in the case of further moisturizing, as is done in intaglio printing. The stabilization coating affects the substrate paper in the sheet during further processing of the sheet. However, it also improves the flatness of the individual banknote, that is to say improves its further processing or handling, for example in banknote checking devices, banknote sorting devices or banknote counting devices. This is a first effect of the stabilization coating. Furthermore, the hurdle for counterfeiting is increased by the stabilization coating with at least two distinguishable surface sections, since additional security features are applied to the substrate with the aid of the respective surface sections of the stabilization coating.

The substrate only optionally has no opening in the section, i.e. it is continuous and the front and the rear are uninterrupted in this area.

The stabilization coating has the property known in the prior art that the processability of the substrate is not impaired by the transfer element, e.g. with regard to flatness etc. The stabilization coating has a uniform layer thickness, in particular since it is intended to develop a uniform stabilizing effect.

The stabilization coating, the surface sections and / or the Coating sections can have an independent surface shape. The independent surface shape can be designed as a pattern, symbol or sign. A surface shape is considered to be independent if it does not correspond to the surface shape of the transfer element - possibly minus an optionally available window. The stabilization coating itself can, for example, have a different surface shape (oval, circular, symbol-like ...) than the transfer element (rectangular, oval, circular, ...). Due to the stabilizing function, however, the approximate size and surface shape of the stabilizing coating is partly predetermined by the transfer element. However, one is significantly more flexible in the selection of the surface shape in the case of the surface sections and / or the coating sections. These can be selected independently of the transfer element. Thus, in further refinements, for example, coating sections with a constant, independent surface shape could also be used for different transfer elements.

The different appearance of the stabilization coating on the two surface sections of the substrate is preferably produced by different additives. The additives can be perceived by the observer or can be recognized by machine. Particularly suitable additives are: colorants, such as dyes or color pigments; optically variable pigments, such as interference layer pigments or liquid crystal pigments; magnetically alignable (optionally optically variable) pigments; luminescent substances which, for example, emit after excitation in the UV / IR or VIS range in the same range or in a different range; Invisible additives, in particular additives that can only be detected in the UV or IR range, magnetic additives or additives that increase conductivity. Such additives are well known in and of themselves.

The stabilization coating is preferably formed uniformly on the two surface sections (or in their coating sections) - apart from the additives. It comprises the same ingredients on both surface sections (or in their coating sections) and thus the same stabilizing effect. The additives are particularly preferably of the same type of additive.

In a preferred embodiment, at least one surface section is printed with optically variable and / or luminescent substances. In addition, in a preferred embodiment, at least one of the surface sections is coated photochromically and / or thermochromically. All these design options for the surface sections of the stabilizing coating increase the number of security features of the substrate, which means that the hurdle for forgery can be raised further. Each substrate can contain one or more of the mentioned additives in a surface section of the stabilization coating.

The stabilizing coating preferably has a covering surface, with at least 80% - preferably 100% - area coverage. In this case, it is preferably present with a precise fit with the transfer element.

In addition to the possibility of optical differentiation based on the different design of the stabilization coating on the surface sections of the substrate, in a preferred embodiment a machine differentiation based on different IR substances (filtering or absorbing a given IR wavelength) or UV substances (a given UV Wavelength filtering or absorbing), different magnetization or different conductivities provided on the surface sections. The surface sections (or the coating sections) can - for example alternately - be arranged in such a way that a machine-recognizable code is created, in particular an IR code, a magnetic code or a conductivity code.

The transfer element can have its own carrier layer, in particular carrier film. Alternatively, the transfer element is carrier-free, that is to say has no carrier layer of its own, such as carrier film. In a known manner, the transfer element - with or without its own carrier film - is transferred as an element from an intermediate carrier to the substrate when it is applied to the substrate.

In a further embodiment, the substrate is designed in such a way that it has a window (or an opening). The transfer element spans the window. This feature also helps to stabilize and increase the counterfeit hurdle. The coating can be applied before or after the window is introduced into the substrate.

In a preferred embodiment, at least one further printing element is applied to a different location on the substrate in the same printing cycle with the stabilizing coating. This supplements the substrate with further security features and also makes it possible to accelerate the production process of the substrate.

Since in the present case it is not intended to provide a stabilizing coating that is chemically or mechanically improved per se by its ingredients (but by the additives), reference can be made to the known methods and ingredients.

The stabilization coating improves the mechanical properties, such as tensile strength and / or flexural rigidity, of the security paper in the section. The tensile strength and / or the flexural strength of the security paper in the section is preferably increased by at least 2%, preferably at least 4%, more preferably at least 5%, by the stabilizing coating. In particular, the increase is a maximum of 50%, generally less than 25%. The security paper with substrate and transfer element is measured before and after the stabilization coating is applied. The tensile strength and / or the flexural strength of the stabilization coating is in preferred configurations in the range from 25% to 150%, preferably 33% to 99%, more preferably 33% to 75% of the tensile strength or flexural strength of the transfer element. The mechanical property, such as tensile strength and / or flexural strength, of the stabilization coating is at least 1.1 times greater, preferably at least 1.5 times greater, than a substrate layer of the same thickness in further configurations. The maximum factor in each case is 5. The values mentioned can advantageously exist in combination with one another.

Furthermore, a security paper is also provided which has a flatly extended substrate which has a front and a back. A transfer element, which is delimited by at least one edge, is applied to the front side. Furthermore, a stabilization coating is applied to the rear side in a section of the substrate. Furthermore, the transfer element is covered by the stabilization coating on the rear side in the plan view. Within the section, at least two surface sections of the substrate are printed or coated differently by the stabilization coating. The properties and features mentioned above in connection with the manufacturing process also apply equally to the security paper itself.

The substrate can be a single or multi-layer substrate and consist of paper, optionally with the addition of a plastic film. Any type of paper can be used as paper, in particular made of cotton. Of course, paper can also be used which contains a proportion of plastic material, for example a polymer material.

The security paper can be used in particular to produce a security document, in particular a bank note. Such a security document is therefore also provided.

• 1A und 1B Draufsichten auf ein Banknotenpapier, das mehrere Nutzen bereitstellt,
• 2A und 2B Draufsichten auf eine Vorderseite eines Nutzens in zwei Varianten,
• 3A und 3B Draufsichten auf eine Rückseite des Nutzens in zwei Varianten,
• 4 eine Schnittdarstellung durch den Nutzen der 2A und 3A,
• 5A-L Draufsichten auf die Rückseite des Nutzens der 2A und 3A in verschiedenen Weiterbildungen,
• 6 eine Schnittdarstellung durch einen Nutzen in einer Ausführungsform mit sich überlappenden Flächenabschnitten.

The invention is explained in more detail below on the basis of exemplary embodiments with reference to the accompanying drawings, which likewise disclose features that are essential to the invention. These exemplary embodiments are used for illustration purposes only and are not to be construed as restrictive. For example, a description of an exemplary embodiment with a multiplicity of elements or components should not be interpreted to the effect that all of these elements or components are necessary for implementation. Rather, other exemplary embodiments can also contain alternative elements and components, fewer elements or components, or additional elements or components. Elements or components of different exemplary embodiments can be combined with one another, unless otherwise stated. Modifications and variations which are described for one of the exemplary embodiments can also be applied to other exemplary embodiments. To avoid repetition, elements that are the same or that correspond to one another are denoted by the same reference symbols in different figures and are not explained repeatedly. In the figures show:

• 1A and 1B Top views of a banknote paper providing multiple uses
• 2A and 2 B Top views of a front side of a panel in two variants,
• 3A and 3B Top views of a rear side of the panel in two variants,
• 4th a sectional view through the benefits of 2A and 3A ,
• 5A-L Top views of the back of the benefit of the 2A and 3A in various training courses,
• 6th a sectional view through a panel in an embodiment with overlapping surface sections.

1A and 1B show schematically a banknote paper in plan view 1 . The banknote paper is made up of several panels 2 which at limits 3 adjoin each other and from a sheet edge 4th are enclosed. Every benefit 2 provides a substrate for subsequent processing steps.

1A shows an application area in the form of a strip in the exemplary embodiment 5 for applying a strip-shaped transfer element 6th and a strip-shaped stabilizing coating 7th , 1B a patch-shaped application area 8th for applying a patch-shaped transfer element 9 and a patch-shaped stabilizing coating 10 . Each of the following on the basis of a strip-shaped application area 5 Illustrated embodiments and refinements are also for a patch-shaped application area 8th actionable.

2A shows a single benefit 2 of banknote paper 1 facing a front 11 . In the strip-shaped application area 5 on the front side 11 first becomes a strip-shaped primer 12th applied, on which the strip-shaped transfer element 6th is applied. The strip-shaped transfer element 6th includes optically or otherwise recognizable security features that protect against counterfeiting of the benefit 2 or a banknote made with it. The strip-shaped transfer element can comprise a film as a carrier or can be carrier-free. It can be designed to be continuous, but it can also include a recess. 2A shows a window 13th which is formed in the substrate. The window 13th is preferred by the transfer element 6th locked. It would be conceivable that the transfer element is also a window 13th which is either over a substrate section without a window or congruently over the window of the substrate.

2 B also shows the individual benefits 2 of banknote paper 1 facing the front 11 . In the patch-shaped application area 8th is on the front 11 first a patch-shaped primer 14th applied to which the patch-shaped transfer element 9 is applied. The substrate of benefit 2 can be a window 13th include. The patch-shaped transfer element 9 is just like the strip-shaped transfer element 6th usually be carried out consistently. It locks the window 13th of the substrate. Only in exceptional cases does the transfer element 9 a window (possibly shared with the substrate) 13th on. In the embodiments explained below, the transfer elements have one or two edges and / or a circumferential edge.

3A and 3B show one of the front 11 opposite back 15th . This is in 3A a stabilizing coating in the form of a strip here 7th upset. This stabilizing coating 7th is in 3A continuously. In the optional window 13th of the substrate (and / or the transfer element) is the stabilization coating 7th left out. In 3B is on the back 15th a patch-shaped stabilizing coating 10 upset. This can be the same as the strip-shaped stabilizing coating 7th be made continuous and together with the substrate (and / or the transfer element) a window 13th exhibit.

4th shows the benefit 2 in a sectional view using the example of a strip-shaped application area 5 . On the front side 11 are, as described, the strip-shaped primer 12th and the strip-shaped transfer element 6th upset. The strip-shaped application area can also 5 with an optional paper thinner 16 be trained. On the back side 15th is the strip-shaped stabilization coating 7th applied, which the strip-shaped transfer element 6th (and optionally the strip-shaped primer 12th ) covered laterally in the sectional view. This overlap is in the case of a patch-shaped application area 8th designed in the same way. The overlap improves the workability and in particular the flatness of the panel 2 and / or the banknote paper 1 clear. Especially with the subsequent intaglio printing on the front and / or back 11 , 15th this is a great advantage.

5A-L concern design options for the rear 15th . 5A-F show a strip-shaped stabilization coating that is applied to a first and a second surface section of the panel and is designed differently in these surface sections, for example by different printing or coating. The stabilizing coating contains different additives on the two surface sections. This enables optical or machine differentiation, which implements an additional security feature in the stabilization coating.

In embodiments, for example according to 5A or 5B , this is realized by at least two coating sections 17th and 18th on the surface sections. This is the first coating section 17th on the first surface section and the second coating section 18th applied to the second surface section. In these embodiments, the coating sections and the surface sections are optionally congruent in plan view.

In the 5A or. 5B are the coating sections as longitudinal strips ( 5A) or as horizontal stripes ( 5B) executed. In a further embodiment, with the aid of the different surface sections 17th and 18th a machine-readable IR code is applied, as it is in 5C is shown. Further in further embodiments are the coating sections 17th , 18th as patterns, ornaments and / or characters, as in 5D-F and 5 HL upset. In a further embodiment, the strip-shaped stabilizing coating is shown with gradual color tones, as shown in FIG 5G is shown. In addition, in another embodiment, there are tonal motifs 19th and watermarks 20th ( 5H) , further printing elements 21 ( 5K) , as well as information as negative text 22nd and / or as positive text 23 ( 5L ) applied.

The coating sections, ie the stabilizing coating, are preferred 7th generated by a printing process and the mentioned further printing elements are produced in the same printing process as the stabilization coating 7th on the back of the substrate 15th upset.

All embodiments apply to the patch-shaped application area 8th the same way.

Each of the specified combinations of features is possible both alone and in conjunction with at least one of the other specified features.

6th shows a section through the benefit 2 in a further embodiment. Here is an overlap of the two coating sections 17th , 18th the stabilization coating 7th realized. This creates an overlap area 24 . This is analogous to a patch-shaped application area 8th possible. Through this overlap area of the two coating sections 17th , 18th the stabilization coating will benefit the stability 2 increased again, this at the same time with further security features through the possible variations of the coating sections described in the previous figures 17th , 18th is made more attractive, and at the same time the hurdle for counterfeiting is further increased.

The above were exemplary embodiments with two coating sections 17th , 18th described on two corresponding surface sections of the portion of the substrate. Embodiments are not limited to this, but a plurality of coating sections can be used. In particular, individual coating sections can be designed in the form of a pixel for generating a multitone or colored image. In addition, the coating sections or the surface sections do not have to directly adjoin one another; Gaps are possible. Even then, the stabilizing coating still has a sufficient effect for better processability of the substrate.

List of reference symbols

1

Banknote paper

2

Use

3

border

4th

Sheet edge

5

Strip-shaped application area

6th

Strip-shaped transfer element

7th

Strip-shaped stabilization coating

8th

Patch-shaped application area

9

Patch-shaped transfer element

10

Patch-shaped stabilization coating

11

front

12th

Strip-shaped primer

13th

window

14th

Patch-shaped primer

15th

back

16

Optional paper thinning

17th

First coating section

18th

Second coating section

19th

Tonal element

20th

Watermark

21

Printing element

22nd

Information as negative text

23

Information as positive text

24

Overlap area

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• WO 2011/015622 A1 [0003]
• EP 1727684 B2 [0005]
• WO 2004/024464 A1 [0005]
• EP 2411232 B1 [0005]
• EP 2860040 B1 [0005]

Claims (15)

A method for producing a security paper, comprising the following steps: providing a flatly extended substrate (2) which has a front (11) and a back (15), applying a transfer element (6; 8) to the front (11), which is bounded by at least one edge, and applying a stabilization coating (7; 10) to the rear side (15) in a section of the substrate, wherein the section of the substrate with the applied stabilization coating (7; 10) is the applied transfer element (6; 8 ) covered in plan view, characterized in that the stabilization coating (7; 10) is applied in such a way that the section has at least two surface sections which differ with regard to an appearance of the stabilization coating (7; 10) that can be perceived or measured from the rear side (15). distinguish. Procedure according to Claim 1 , characterized in that the two surface sections are printed or coated differently. Method according to one of the above claims, characterized in that the stabilization coating (7; 10) extends in plan view at least to the edge of the transfer element (6; 8), preferably completely covers or covers the transfer element (6; 8). Method according to one of the above claims, characterized in that the stabilization coating (7; 10) has a first and a second coating section (17, 18), of which the first lies in the first surface section and the second in the second surface section, wherein preferably - in one of the two or in both surface sections - several of the corresponding first or second coating sections (17, 18) lie. Procedure according to Claim 4 , characterized in that the coating sections (17, 18) are applied adjacent to one another or spaced apart from one another and / or the coating sections (17, 18) are applied over the entire area or over part of the area. Method according to one of the above claims, characterized in that the stabilization coating, the surface sections and / or the coating sections have an independent surface shape, in particular in the form of patterns, symbols, ornaments or characters. Method according to one of the above claims, characterized in that an additive is present in the stabilization coating on at least one of the surface sections for the different appearance, preferably different additives are present in the stabilization coating on the two surface sections. Method according to claim, characterized in that the stabilizing coating comprises a photochromic and / or thermochromic additive in at least one of the surface sections; and / or comprises a colorant as an additive, in particular in a hue or as an optically variable pigment, and / or a luminescent additive in at least one of the surface sections. Method according to one of the above claims, characterized in that the stabilization coating is formed on the surface sections in such a way that the different appearance, in particular in the form of differences in the infrared, in magnetization or in conductivity, can be distinguished by machine, and that the preferably in The form of a coding is present, for example as an infrared code, magnetic code or conductivity code. Method according to one of the above claims, characterized in that the substrate (2) is continuous in the section, so that there the front (11) and the rear (15) are uninterrupted. Method according to one of the Claims 1 to 9 , characterized in that the substrate has a window in the section which spans the transfer element (6; 8) in plan view. Method according to one of the above claims, characterized in that the stabilizing coating (7; 10) is applied in one printing process in conjunction with a further printing element (21). Security paper which has: - a two-dimensionally extending substrate (2) with a front (11) and a back (15), - a transfer element (6; 8) on the front (11) which is delimited by at least one edge, and - a stabilization coating (7; 10) on the rear side (15) in a section of the substrate which covers the transfer element (6; 8) in plan view, characterized in that the stabilization coating (7; 10) on the rear side (15 ) is applied in such a way that the section has at least two surface sections which are perceptible or perceptible from the rear side (15) measurable appearance distinguish the stabilization coating (7; 10). Security paper after Claim 13 , characterized in that the security paper by a method according to one of Claims 1 to 12th can be produced. Security document, in particular bank note, comprising a security paper according to one of the Claims 13 to 14th .

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