WO2014095039A1

WO2014095039A1 - Substrate sheet for producing security documents and value documents

Info

Publication number: WO2014095039A1
Application number: PCT/EP2013/003812
Authority: WO
Inventors: Patrick Renner; Thomas Mang
Original assignee: Giesecke & Devrient Gmbh
Priority date: 2012-12-18
Filing date: 2013-12-17
Publication date: 2014-06-26
Also published as: EP2934898A1; ES2667060T3; EP2934898B1; DE102012024768A1

Abstract

The invention relates to a planar substrate sheet (10) for producing security documents and value documents, comprising two main surfaces (14, 16) lying opposite each other, corners (18), and side edges (20), which connect the corners and which form a perimetric edge (22) of the substrate sheet. According to the invention, at least in the region of the edge of the substrate sheet (10) on at least one main surface (14), the substrate sheet (10) comprises a stabilizing layer (24) for mechanically stabilizing the substrate sheet (10).

Description

Substrate sheet for the production of security and value documents

The invention relates to a flat substrate sheet for the production of security and value documents, with two opposing major surfaces and with edges and corners connecting the edges, which form a peripheral edge of the substrate sheet. The invention also relates to a paper substrate for producing a paper banknote or a film composite banknote and to a value document having such a paper substrate.

The term substrate sheet in the present application refers to a sheet of a substrate material suitable for the production of security and value documents, such as a paper sheet or a foil composite sheet (hybrid sheet), which consists of a plurality of mutually alternating film and paper layers.

During the processing of such substrate sheets, in some cases, for example in the printing of composite foil sheets in steel printing, a so-called parachute formation can occur in the delivery. The printed sheet does not sail flat into the display, but the corners fall first downwards. This has disadvantages for the laying behavior of the sheets, as the corners with relatively high pressure on the fresh color of the underlying sheet to slide. This carries the risk that the colors smudge and deposit on the opposite arch. Reduced stacking heights and system speeds result in reduced productivity.

Proceeding from this, the object of the invention is to avoid the disadvantages of the prior art and in particular the productivity to increase in the processing of substrate sheet, ideally combined with an improved flatness of the sheet.

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

According to the invention, a planar substrate sheet of the type mentioned on at least one major surface at least in the region of the edge of the substrate sheet on a stabilizing layer for mechanical stabilization of the substrate sheet.

In an advantageous variant of the invention, the stabilization layer may be provided along the entire circumferential edge of the substrate sheet in order to stabilize the sheet uniformly. In another, likewise advantageous variant of the invention, the stabilization layer is provided in the region of the edge of the substrate sheet only at the corners of the substrate sheet, and then serves in particular for corner stabilization. In a further advantageous variant, the stabilization layer in the region of the edge of the substrate sheet is provided only at two corners and the side edge connecting the two corners, and then serves in particular for edge stabilization, with stabilization of the leading edge lying in the process direction contributing particularly to improved deposition behavior. In a further advantageous variant of the invention, the stabilization layer is present in the region of the edge of the substrate sheet in the form of a multiplicity of oblique strips which are arranged at a distance along the peripheral edge of the substrate sheet. It is understood that the stabilization layer does not have to be present exclusively in the edge region of the substrate sheet, but rather that the stabilization layer next to it can also have partial regions lying in the interior of the substrate sheet. These inner subregions serve, in particular, for stabilizing individual components arranged on the substrate sheet after their separation.

The partial region of the stabilization layer provided in the edge region of the substrate sheet advantageously lies outside of individual components arranged on the substrate sheet, so that it can be readily removed in a later process step when cutting the substrate sheet. In contrast, the inner portions of the stabilizing layer usually remain after cutting the substrate sheet part of the isolated individual benefits and serve primarily their stabilization. With suitable design, these subregions can also be integrated as design elements in the individual components, as explained in more detail below.

The stabilization layer may be provided on only one of the two main surfaces or on both main surfaces of the substrate sheet. In the case of two-sided printing of a substrate sheet, the stabilization layer is preferably also applied to both main surfaces.

In an advantageous embodiment, it is provided that the stabilization layer has a constant thickness.

The stabilization layer is advantageously formed by a printing layer, in particular by a dye or varnish imprint. For example, gravure, flexo or steel printing are suitable as printing processes. However, the preferred printing method is currently the screen printing method, since it works achieve high layer thicknesses at high viscosities or a high solids content.

The paints used for printing can be transparent or colored. In the case of hybrid sheets in particular, additional security features or security prints can be introduced when printing the stabilization layer onto the paper layer. A stabilizing layer with a relatively high layer thickness can still be tactilely detectable even after lamination, thus forming, for example, a tactile security feature.

In particular, when printing on a paper layer, such as a paper sheet or the paper layer of a hybrid sheet, it may be advantageous if the material of the stabilizing layer partially penetrates into the paper layer. This can be achieved, for example, in printing by the use of water-based paints or solvent-based systems. In contrast, solvent-free systems, such as 100% UV coatings, are particularly preferred when large layer thicknesses are desired. The paints used are advantageously characterized by high flexibility and tear strength. It is usually also advantageous if the paint behaves less fluid after printing.

Instead of a pressure layer, the stabilization layer can also be formed by a nozzle application layer. In this case, for example, low-viscosity adhesives can be used and applied by a nozzle application, which penetrate into a paper layer of the substrate sheet. In addition to the stabilization, the penetration of the adhesives can result in a visible trans-parentisation of the paper layer. In advantageous configurations, the stabilization layer is applied at least in partial regions, if appropriate also completely, directly on the substrate sheet, in particular a paper sheet. It may be advantageous if the stabilization layer in the contact region with the substrate sheet, in particular a paper sheet, partially penetrated into this.

In other, likewise advantageous configurations, the stabilization layer is separated from the substrate sheet by one or more intermediate layers, at least in some areas, if appropriate also completely. At least one intermediate layer is advantageously formed by a film, a laminating adhesive and / or a paint receiving layer.

It is understood that the stabilizing layer according to the invention can be arranged on at least one main surface of the substrate sheet and at the same time can be arranged in a region which is separated from the substrate sheet by one or more intermediate layers. For example, in the case of a film composite sheet (hybrid sheet), the stabilization layer may be arranged on at least one main surface of the substrate sheet and furthermore on at least one film or at least one ink-accepting layer. The reason for the particularly good stabilization of this embodiment is currently considered to be that altogether relatively high amounts of stabilizing layer are applied to the substrate sheet in different areas or on different layers of the substrate sheet. In such embodiments, the stabilization of the substrate sheet is therefore extremely good, ie, effects such as the above-mentioned parachuting are substantially completely prevented. The substrate sheet is in particular a paper sheet, the paper layer of a film composite sheet (hybrid sheet) or a composite film sheet (hybrid sheet), preferably with a layer structure film / paper / foil or paper / foil / paper. It should be noted here that multilayer composite sheets which have at least one paper layer are referred to hereinafter as "composite film sheet" or "hybrid sheet". In a corresponding manner, for example, in the case of a banknote which has at least one layer of paper and at least one further layer of foil, it is referred to as a "foil composite banknote" or a "hybrid banknote". The use of the terms "film composite" or "hybrid" is therefore to be construed in the context of the present application as a synonym.

As a polymer substrate, it is further conceivable to use a single-layer polymeric substrate, e.g. from BOPP or PET, as well as other polymers or crosslinked polyolefins or crosslinked polyamides.

If the substrate does not have at least one paper layer, in the context of the present application a "polymer substrate", in particular a "polymer banknote" is used. Such a polymer substrate may be single-layered or multi-layered. For example, such a polymer substrate can be formed from two interconnected polymer webs of biaxially oriented polyolefin, in particular biaxially oriented polypropylene (BOPP). However, a polymer composite of a total of three layers is also conceivable, the middle polymer web being formed from BOPP, while the outer film webs applied on both sides of this middle web are formed from PET (layer sequence: PET / BOPP / PET). For such polymer substrates, penetration of the stabilizing layer into the polymer substrate is described below explained on the film layer of a film composite substrate, usually not possible.

The invention also encompasses a paper substrate for producing a paper bank note or a film composite banknote, having two opposing main surfaces and side edges connecting with corners and corners, which form a circumferential edge of the paper substrate, it being provided according to the invention that the paper substrate is supported on at least one of the paper substrates Main surface has a stabilizing layer for mechanical stabilization of the paper substrate.

The stabilization layer may advantageously be formed closer in the manner described above in connection with the substrate sheet. In particular, the stabilizing layer of the paper substrate may be provided along the entire peripheral edge of the paper substrate, present at the corners, or at two corners and the side edge connecting the two corners. The stabilization layer can also comprise a plurality of strips, which are arranged, for example, at a distance along the peripheral edge of the paper substrate or in the region of corners or edges.

The stabilizing layer may be provided on only one of the two major surfaces or on both major surfaces of the paper substrate and, in an advantageous configuration, may have a constant thickness. As already described above, the stabilization layer may advantageously be formed by a print layer or a nozzle application layer, wherein the statements made above in connection with substrate sheets also apply to the print layers or nozzle application layers of paper substrates. The stabilization layer can be applied directly to the paper substrate, at least in partial areas, if appropriate also completely, and it can be advantageous if the stabilization layer has partially penetrated into the contact area with the paper substrate. In other, likewise advantageous configurations, the stabilization layer is separated from the paper substrate, at least in some areas, if appropriate also completely, by one or more intermediate layers. At least one intermediate layer is advantageously formed by a film, a laminating adhesive and / or a paint receiving layer.

Finally, the invention also encompasses a value document, in particular a paper banknote or film composite banknote, having a paper substrate of the type described. The stabilization layer is advantageously present on one of the outer layers of the document of value.

The stabilization layer provided according to the invention achieves in particular the following advantages:

- an avoidance of parachuting, especially in stitches;

- a reduction of the depositing, in particular of offset and Stahldruck- dyeing;

- a better flatness in the delivery of printing presses; and

- a better sliding of the bow.

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 schematically a paper sheet according to an embodiment of the invention,

2 shows a cross section of the sheet of Figure 1 in the edge region along the line II-II,

Fig. 3 to 6 cross-sections as in Fig. 2 for other embodiments of the

Invention,

Fig. 7 in (a) to (c) further stabilized by stabilizing layers

Designs of paper sheets according to the invention, and

8 and 9 show two embodiments of paper substrates according to the invention for illustration of the stabilization of individual uses.

The invention will now be explained using the example of paper sheets for the production of banknotes. Figures 1 and 2 show schematically a paper sheet 10 which carries a plurality of individual utility 12, which correspond to later cut banknotes. 1 shows the paper sheet 10 in plan view, and Fig. 2 shows a cross section of the sheet in the edge region along the line II-II of Fig. 1st

As can be seen in Figures 1 and 2, the paper sheet 10 has opposite first and second major surfaces 14, 16, four corners 18 and four side edges 20 connecting the corners. The corners and side edges form a peripheral edge 22 of the paper sheet 10. FIG. 1 shows a plan view of the first main surface 14, the front of the paper sheet 10 and also represents the banknotes produced from the individual benefits 12. On this first main surface 14 of the paper sheet 10, a stabilizing layer 24 according to the invention is applied, which runs along the entire circumferential edge 22 of the substrate sheet.

The circulating stabilization layer 24 mechanically stabilizes the paper sheet 10 and thereby avoids the above-mentioned parachuting during processing. In addition, by the stabilization layer 24, the deposition of about offset and steel inks can be reduced. Also, a better flatness in the delivery of printing presses and a better sliding behavior of the sheet is achieved.

The stabilization layer 24 is located outside of the individual bumps 12 and is removed in a later step in the process of cutting the paper sheet 10 into the individual bumps 12.

In the embodiment of Figures 1 and 2, a paint 26 or a color was printed to produce the stabilizing layer 24 in the edge region 22 of the sheet by screen printing. The thickness of the imprint (amount of ink) and the physical properties of the optionally cured layer (flexible, brittle, degree of crosslinking, solvent-based, solvent-free, etc.) can be selected according to the desired layer properties. Pay attention to the time of application, in particular whether the order is made on base paper, on composite foil or on finished hybrid with ink-accepting layer.

In the exemplary embodiment of FIG. 2, the lacquer 26 is applied directly to the base paper 30 without intermediate layers, so that the lacquer can penetrate into the paper in a surface region 32 and thus strengthen the paper fibers. ker fixed. Over the stabilizing layer 24, a film 34 with laminating adhesive and a paint receiving layer 36 are provided.

Instead of applying the stabilization layer only on one main surface of the sheet, a stabilization layer 24 may also be provided on both main surfaces 14, 16 of the paper sheet 10, as illustrated in the cross section of FIG. 3. In this embodiment, the stabilizing layer 24 of the two main surfaces was produced by printing a printing ink 40 by screen printing. By using the screen printing method, high layer thicknesses can be achieved at high viscosities or a high solids content. Similar to the design of Fig. 2, the ink 40 penetrates into a surface area 32, such as the base paper 30 of the paper sheet, thereby fixing the paper fibers. On both main surfaces 14, 16, a film 34 with laminating adhesive and a ink-accepting layer 36 are respectively applied over the stabilizing layer 24.

The variant of FIG. 4 largely corresponds to the embodiment shown in FIG. 3, wherein the stabilizing layer 24, however, in contrast to FIG. 3, is formed by a strongly penetrating imprint 42.

This can be achieved for example by the use of a water-based paint or by the use of solvent-based systems. As can be seen from FIG. 4, the material of the imprint 42 and thus the stabilization layer 24 penetrates into the base paper 30 overall in a deep penetration region 44. The desired mechanical stabilization is achieved without a thick layer application is generated on the surface of the sheet. This can be particularly useful if the stabilization layer 24 also subregions in the interior the paper sheet and in particular in the area of the individual benefits 12, which should remain in the finished banknotes.

It should be noted at this point that the depth of penetration of the stabilization layer depends on many influencing factors, e.g. the quality of the substrate used, in particular paper, as well as the quality of the printing used as a stabilizing layer, in particular of the paint used. Furthermore, the penetration depth also depends on the amount of material applied to the substrate to be stabilized, in particular the amount of stabilizing lacquer applied. Another factor for the penetration depth is the time until hardening of the stabilizing layer after the application, since from a certain degree of cure further penetration of the stabilizing layer into the substrate to be stabilized is no longer possible. More generally, however, it can be said that the depth of penetration from each side of the substrate can be so great that the stabilizing layers deposited on the two opposing major surfaces of the substrate overlap within the substrate. That is, the stabilization layer penetrates the entire substrate thickness in such a particularly preferred embodiment.

In the embodiment of FIG. 5, the structure of which basically follows the structure of the exemplary embodiment of FIG. 3, the stabilization layer 24 is not applied directly to the paper sheet 10, but is between a film 34 applied to the paper sheet 10 and the dye-accepting layer 36 arranged. In this variant, the stabilization layer 24 does not penetrate into the paper sheet 10.

A further possibility of arranging the stabilization layer 24 is shown in FIG. 6, where the stabilization layer 24 is provided both by a foil 34 and is also separated from the paper sheet 10 by a paint receiving layer 36. In this variant too, the stabilization layer 24 does not penetrate the paper sheet 10. FIG. 7 shows three further configurations of paper sheets 10 mechanically stabilized by stabilization layers 24. In the exemplary embodiment of FIG. 7 (a), only the corner regions 50 of the paper sheet 10 are provided with the stabilization layer 24. The stabilization layer 24 present in the corner regions 50 also lies outside of the individual terminals 12 and is removed in a later method step.

With reference to the illustration of FIG. 7 (b), the stabilization layer 24 in an alternative embodiment may, for example, also be provided only at the two upper corners 52 and at the side edge 54 extending between these corners. Thereby, the leading edge of the paper sheet 10 is stabilized for storage.

In another configuration, shown in Fig. 7 (c), the stabilizing layer 24 is in the form of a plurality of oblique strips 56 spaced along the peripheral edge 22 of the paper sheet 10 about the individual end 12 and thereby mechanically stabilizing the sheet edge. By the width and the distance of the individual strips 56 from each other, the additional basis weight and thus the effect of the stabilizing layer can be varied and adjusted as desired, so that a different storage behavior of different paper sheets can be readily taken into account.

In all the embodiments described so far, the stabilizing layer can also be found in the interior of the sheet in addition to the subregions at the edge of the paper sheet Paper sheets lying sub-areas, which serve in particular the stabilization of the individual benefits after their separation. Some advantageous embodiments are illustrated with reference to FIGS. 8 and 9. First, FIG. 8 shows a plan view of a paper substrate 60 for producing a paper banknote or a film composite banknote. The paper substrate 60 may, for example, correspond to one of the individual uses 12 of FIGS. 1 to 7 or may have been created by singling out a paper sheet that has not itself been designed according to the invention. The paper substrate 60 has as major surfaces a front side 62 and an opposite rear side. The corners 64 are connected by side edges 66 and form a peripheral edge of the paper substrate.

On the front side 62, the paper substrate is provided with a stabilization layer 70 of three partial areas 72, 74, 76, which serves for the mechanical stabilization of the paper substrate. In the exemplary embodiment, three differently designed partial areas are shown for illustration, but it is of course also possible to equip the paper substrate with a different number of partial areas or with several identical partial areas. A stabilization layer consisting of only one contiguous region is also possible, for example in the form of a circumferential stabilization layer, as shown in FIG. 7 (a), or in the form of an edge reinforcement, as shown in FIG. 7 (b) and in the partial region 74 ,

In the partial region 72, the stabilization layer is arranged in the region of the upper right corner 64 of the paper substrate and serves for corner stabilization. The stabilization layer of the subarea 74 includes, in addition to the region of the two lower corners 64, also the region of the side edge 66 connecting these corners and serves for stabilizing the edge of the lower edge of the paper substrate 60. The subarea 76 of the upper left corner of the paper substrate. strats 60 consists of three radially arranged strips and also serves the corner stabilization. Such stabilization layers, in addition to the stabilizing effect in the foreground, can additionally be used as design elements which contribute to the overall design of the bank notes to be produced.

The embodiment of FIG. 9 shows a plan view of another paper substrate 60 for producing a paper bank note or a film composite banknote, in which the stabilization layer 78 is in the form of a grid grid extending substantially over the entire front side 62 of the substrate. The grid may also be formed with a smaller grid width than shown in FIG. 9 and, in addition to the right-angled symmetry, may also have another, for example, hexagonal symmetry. The grid may be applied to the front side 62 on the back of the paper substrate 60.

In the stabilization of single-use, the shape and position of the stabilizing layer is preferably adapted to the design of the single-use or of the value document generated therefrom. In some designs, this adaptation can consist in concealing the presence of a stabilizing layer as much as possible, while in other embodiments the stabilizing layer can even be used as a design element itself.

LIST OF REFERENCE NUMBERS

10 paper sheets

12 individual benefits

14, 16 main surfaces

18 corners

20 margins

22 peripheral edge

24 stabilization layer

26 paint

30 base paper

32 surface area

34 foil

36 paint receiving layer

40 printing ink

42 imprint

44 penetration area

50 corner areas

52 corners

54 page margin

56 oblique stripes

60 paper substrate

62 front side

64 corners

66 margins

70 stabilization layer

72, 74, 76 subareas

78 stabilization layer

Claims

Patent claims

1. Sheet substrate for the production of security and value documents, with two opposing major surfaces and with

Corners and the corners connecting the edges, which form a peripheral edge of the substrate sheet, characterized in that the substrate sheet on at least one major surface at least in the region of the edge of the substrate sheet has a stabilizing layer for mechanical stabilization of the substrate sheet.

2. substrate sheet according to claim 1, characterized in that the stabilizing layer is provided along the entire peripheral edge of the substrate sheet.

3. substrate sheet according to claim 1, characterized in that the stabilizing layer is provided in the region of the edge of the substrate sheet only at the corners of the substrate sheet or only at two corners and the side edge connecting the two corners.

4. substrate sheet according to claim 1, characterized in that the stabilizing layer in the region of the edge of the substrate sheet is in the form of a plurality of oblique strips which are arranged spaced along the peripheral edge of the substrate sheet.

5. substrate sheet according to at least one of claims 1 to 4, characterized in that a stabilizing layer is arranged on both main surfaces of the substrate sheet.

6. substrate sheet according to at least one of claims 1 to 5, characterized in that the stabilizing layer has a constant thickness.

7. substrate sheet according to at least one of claims 1 to 6, characterized in that the stabilizing layer is formed by a printing layer, in particular by a dye or Lackaufdruck.

8. substrate sheet according to at least one of claims 1 to 7, characterized in that the stabilizing layer, at least in some areas directly on the substrate sheet, in particular a paper sheet is applied.

9. substrate sheet according to claim 8, characterized in that the stabilizing layer in the contact region with the substrate sheet, in particular a paper sheet, partially penetrated into this.

10. substrate sheet according to at least one of claims 1 to 9, characterized in that the stabilizing layer is at least partially separated by one or more intermediate layers of the substrate sheet, in particular that at least one intermediate layer by a film, a laminating adhesive and / or a paint receiving layer formed is.

11. substrate sheet according to at least one of claims 1 to 10, characterized in that the stabilizing layer has arranged in the interior of the substrate sheet subregions, in particular for stabilizing disposed on the substrate sheet single-use after their separation.

12. substrate sheet according to at least one of claims 1 to 11, characterized in that the substrate sheet is a paper sheet or a foil composite sheet (hybrid sheet), preferably with a layer structure film / paper / foil or paper / foil / paper.

A paper substrate for producing a paper banknote or a film composite banknote, having two opposite major surfaces and side edges connecting with corners and edges, which form a circumferential edge of the paper substrate, characterized in that the paper substrate has on at least one major surface a stabilizing layer for the mechanical stabilization of the paper Having paper substrate.

14. document of value, in particular paper banknote or composite film banknote, with a paper substrate according to claim 13, wherein the stabilizing layer is preferably present on one of the outer layers of the document of value.