EP3974203A1 - Document body with front side recognition - Google Patents

Abstract

The invention relates to a document body (1) with a forgery-proof end face identifier (412, 423) and a method for its production. The document body (1) comprises a flat lamination body (10) which is formed from a plurality of thin layers (20) which are laminated to one another with their surfaces, the lamination body having an upper side (11) and an opposite underside (12) and wherein at least one end face (13, 14, 16, 17) of the lamination body is formed between the upper side (11) and the lower side (12), the surface area of which is smaller than the surface area of the upper side (11) and the lower side (12), wherein an identifier is formed inside the lamination body so that it can be optically detected on the at least one end face (13, 14, 16, 17) as an end face identifier,wherein the identifier is printed on a layer surface (51) of one of the layers (20) as an identifier (100) is printed, one layer surface (51) being arranged inside the lamination body (10) and the identification print (100) being on the layer surface (51) up to the at least one piece inside (13, 14, 16, 17).

Description

The invention relates generally to document bodies such as are used for security documents or the like. In particular, the invention relates to document bodies that are flat, with an end face or edge being formed between the opposite outer sides, on which an identifier can be optically detected.

Modern value and/or security documents are often designed as a lamination body and/or have a lamination body as a component. These lamination bodies are also referred to as document bodies. For example, they can be identity cards, driver's licenses, ID cards, company ID cards or also data pages from book-like documents such as passport books, passports and the like. Such documents are referred to as security documents which have at least one feature which prevents or impedes imitation, falsification and/or unauthorized production. Physical configurations of security features are referred to as security elements.

It is common to tag document bodies with identifiers to identify individuals or groups of them. For example, security documents are often provided with a serial number, which is printed, for example, or introduced into the document body by means of another method, for example laser engraving. The serial number is an individual identifier.

In certain situations, in particular when processing and/or handling many document bodies of the same type, these are stacked with their main surfaces on top of one another. If these are aligned with one another, only the end faces of the individual document bodies can be seen. The document bodies and/or their orientation can only be identified using an identifier that can be detected on the front side. Such identifiers are called face identifiers.

Markings and/or identifiers known in the prior art, which are applied to an outside of the end faces, do not meet the requirements with regard to protection against forgery, such as are required for document bodies of security documents, for example.

The invention is therefore based on the object of specifying a method and a document body with which a so-called end face identifier can be implemented which is recognizable from the end face and difficult to forge, i.e. an identifier which can be optically detected on the end face.

The object is achieved according to the invention by a document body having the features of patent claim 1 and a method having the features of patent claim 7 . Advantageous configurations of the invention result from the dependent claims.

The invention is based on the idea of printing an identifier on one of the layer surfaces in the form of an identifier print and covering this surface with another layer during lamination, so that the printed surface is arranged in the finished document body inside the document body. The identification print is applied in such a way that it extends to the front side of the finished document body. The result of this is that the identifier can be detected on the end face of the document body.

In particular, a document body with a counterfeit-proof face identifier is provided, which comprises: a flat lamination body which is formed from a plurality of thin layers which are laminated to one another with their surfaces, the lamination body having a top side and an opposite underside and between the top and the At least one end face of the lamination body is formed on the underside, the areal extent of which is less than the areal extent of the upper side and the underside, the identifier being formed inside the lamination body so that it can be optically detected on the at least one end face, the identifier on a ply surface of one of the plies is printed as an identification print, wherein one surface is arranged in the lamination body in the interior and wherein the identification print extends on the ply surface to the end face.

A document body of this type can be produced using a method for producing a document body with forgery-proof front face identification, which comprises the steps of: providing a plurality of thin layers; laminating the multiple thin sheets face to face to form a thin lamination body, which has an upper side and an opposite underside, and wherein at least one end face of the lamination body is formed between the upper side and the underside, the areal extent of which is less than the areal extent of the upper side and the underside; and Forming the end face identifier inside the lamination body so that it can be optically detected on the at least one end face, the identifier being printed on a layer surface of one of the layers as an identifier print prior to lamination, and during lamination another of the layers is laminated directly onto this printed layer surface , so that the printed one surface is located inside the laminated body, with the identification printing extending on the printed sheet surface to the front side.

An advantage of the invention is that the identifier can be integrated into the document body using a simple method, namely by printing it on one of the layers before lamination. Because the printed layer is laminated directly onto another layer, the identification print, which extends to the front of the document body, can be detected on the front, but is nevertheless protected against forgery since it is located inside the document body.

In order to create security against delamination, ie to ensure that the document body does not have a higher tendency to delaminate at the point where the identifier is printed than at other points, a preferred embodiment of the invention provides that one of the layers and the another one of the layers laminated directly onto the surface of the layer printed with the identification print is made on the basis of the same plastic material, and that the printing preparation with which the identification print is carried out is also made on the basis of the same plastic material. This means that the two layers that are laminated directly on top of each other are made of the same plastic material and thus form a very good, stable connection during lamination. As a rule, it can be achieved that an integral connection is formed and no phase transition can be seen in the cross section of the document body at the transition between the material layers, which are formed from the different layers, with regard to the structure of the plastic. However, the layers of material that correspond to the two plies from which they are made can often be distinguished in the document body in that they have different fillers, for example, for example one of the plies is transparent and the other opaque is. In order not to disturb this material connection between the layers originally stacked and laminated together, the print preparation with which the identifier is printed is produced, for example, on the basis of a binder which has the same basic components as the plastic material of the layers. In this way it can be achieved that the identification print does not impede the material connection, but rather the binding agent is integrated into this material connection.

In a preferred embodiment, the one ply and the other of the plies are formed of polycarbonate and the identifying print is applied with a print formulation formed with a binder containing a polycarbonate derivative based on a geminally disubstituted dihydroxydiphenylcycloalkane. As a print preparation, for example, one from the DE 10 2007 052 947 A1 Ink jet ink can be used.

In DE 10 2007 052 947 A1 discloses a process for producing a composite of a first and a second polymer layer, each made of a bisphenol A-based polycarbonate polymer. An ink jet printing layer is arranged on the first polymer layer. The ink jet print layer is formed from an ink jet ink formed with a binder containing a geminally disubstituted dihydroxydiphenylcycloalkane-based polycarbonate derivative. To produce the composite, the second polymer layer is placed on the first polymer layer, with the ink jet printing layer being covered and the two polymer layers being laminated together under pressure at a temperature of 120° C. to 230° C. for a defined period of time.

In order to achieve that the identifier printing extends to the front face of the document body produced, in one embodiment the identifier printing is carried out to the edge of the one ply surface which is printed. Alternatively, especially if several document bodies are produced in a so-called multiple copy, the identification print can be applied and the individual document bodies separated in such a way that the identification print of the respective document body is divided when the document body is separated.

The identification print is carried out, for example, as a bar code, which is also referred to as a bar code. As a result, wide and narrow sections of the identification print can be seen on the front side parallel to the printed layer surface. This means: the lengths and positions of the individual printed sections and the distances between them form the identification or the coding with which information is stored in the identification print. However, the identification print does not have to be executed in one color, but can also be colored and multicolored. Different strips or sections of the visible bar code can have different colors. Additional information can be encoded via this. This means that information can be encoded in the sequence and/or the colors used. It is thus also possible to encode the information only in the color or the colors used.

The identifier is preferably printed in color. A color print is a print that uses at least two colorants that create different color impressions.

It is not absolutely necessary for information about a coding to be assignable to the end face identifier. In order to recognize, for example, whether all the document bodies stacked on top of one another are correctly aligned, it is sufficient, for example, if the identification print is not printed symmetrically to the center of the front side with respect to a direction parallel to the printed surface. For example, if the identifier is printed on one surface as a color gradient from red to blue along the printed edge that is integrated into the front page, a document body in which the top and bottom are reversed in a document body stack is easy to detect because the color gradient is oriented in the opposite direction on the front side. In order to also be able to detect other orientation errors, in which the document body is not only folded over, for example, along a longitudinal edge of the document body, but is also rotated by 180° about an axis running through a center point of the upper side, the identification print can be carried out in such a way that that opposite edges of the printed layer are formed differently and asymmetrically with respect to the main axes of inertia or symmetry axes of the document body.

If, for example, in the case of a document body with a rectangular top and bottom, the short end faces are provided with an end face identifier in such a way that, when looking at one printed layer from above, one short side edge has a color gradient from one long side edge to the other long side edge from red to green and the other opposite short side edge has a color gradient from green to red from one long side to the other long side, a rotation of the finished document body by 180° about an axis of rotation perpendicular to the top would not be recognizable. If, on the other hand, the second side edge is provided with other colors, for example a color gradient from blue to yellow from one side edge to the other side edge, such a twisting of a document body about the axis perpendicular to the surface is noticeable.

In order to be able to rule out manipulations in which the end face, which is provided with the end face identifier, is manipulated in the document body by removing material from the document body on the end face in order to eliminate the end face identifier, it is advantageous if the identifier print on one layer surface or the material layer formed therefrom in the document body extends into the interior of the document body. In a preferred embodiment it is therefore provided that the identification print extends perpendicularly to the at least one end face at least 1 cm, more preferably at least up to the middle of the one printed layer surface and most preferably even over the entire printed surface from the at least one end face to an opposite end face, extends on the printed surface sheet. The face identifier is thus preferably printed on one ply surface so that it extends from one edge to an opposite edge or extends over an area of the ply surface which has a greater extent than a singulated document along the same extent. In this case, the identification print is severed on both opposite faces during separation.

An end face identifier is preferably also used as a hidden feature. This means that the identification print printed on the one sheet surface constituting the document body and located inside the document body cannot be seen from either the top or bottom when viewed or detected in reflection, also known as incident light detection is referred to, is detectable. It is therefore provided in one embodiment that between the top and the Identification print and the underside and the identification print in each case at least one of the layers has sufficient opacity that the identification print cannot be detected for incident light detection, in which illumination with visible light and optical detection take place from the same side. For example, one of the plies whose ply surface is provided with the identifier print may itself have sufficient opacity such that the identifier print is not discernible or detectable when viewed or detected from the unprinted ply surface, provided that side is also illuminated. A further opaque layer can either be laminated directly to the printed surface layer or first a transparent layer or several transparent layers and then an opaque layer on top of that. The opaque cover can also be produced by printing on a transparent layer, provided this has a uniform, non-changing, and therefore homogeneous appearance at the edge facing the front side provided with the front side identifier. Preferably, however, a further layer opaque in volume is placed over the identification print.

In order to be able to check whether the front-side identifier has been manipulated or corresponds to the two-dimensional identifier print, in some embodiments, in particular where the identifier print cannot be detected in incident light, i.e. in reflection, it is provided that the opacities of the layers of the document body (or Lamination body) are selected such that at least one contrast caused by the identification print can be detected in transmitted light detection in which the document body (ie the lamination body) is arranged between the illumination source and the detection device. A 20W halogen spotlight with an opening angle of approx. 36°, which is available, for example, under the name DECOSTAR 51S 20W 12V 36° GU5.3 from Osram GmbH, Munich, is a suitable lighting source for placing a document body whose dimensions are the same Meet the requirements of an ID-1 document of the ISO/IEC 7810 standard to be able to detect the contrast caused by the identification print. Such a halo radiator has a luminous intensity of 480 cd (candela). The nominal luminous flux at a cone angle of 90° is 210 Im (lumens).

Particularly suitable layers that have sufficient opacity to hide the identification print in reflected light detection, i.e. in reflection, and to ensure that the identification print can be detected in transmission in transmitted light, white filled plastic layers, ie plastic layers white in volume, have proven to be effective. Titanium dioxide, for example, can be added as a filler to polycarbonate in order to obtain this property. A document body designed in this way has an identification print that cannot be seen (i.e. cannot be detected) from the top and bottom in incident light with white light illumination, which causes a front-side identifier on one end and is recognizable or detectable in transmitted light as an identification print formed at least over part of the area. This can then be used to reliably check whether the end face identifier is caused by the two-dimensional identifier print or is compatible with it or deviates from it and is thus generated by a marking that is subsequently added from the outside.

The end face identifier described can be formed on one end face or also on opposite end faces or on all end faces of the document body. Preferably, the end face identifiers, which can be detected on the individual end faces, are different in such a way that one end face can be distinguished from the other end faces using the end face identifier. A decision can then be made as to whether two document bodies which have an identical structure and contain the same end page identifiers are oriented in the same or different ways with regard to their orientation.

The colorants used for the identification print are preferably body colors which, when detected under white light irradiation, give a colored or black or gray impression, i.e. an optically detectable impression, against the background of the surface layer on which the identification print is applied. Other embodiments can provide for the identification print to contain luminescent colorants as an alternative or in addition, the luminescence of which can only be detected when stimulated. Color printing can also be carried out with luminescent colorants that cannot be detected, for example, when illuminated with visible light, if two different luminescent colorants are used, which produce different color impressions when appropriately excited, for example with UV light.

However, an identification print that is executed with body colors is preferred, since with this the end face identification can be easily checked with the entire identification print without further aids in addition to a light source. is particularly preferred the identification print is only carried out with colorants that only have a body color and cannot be excited to luminescence.

Fig. 1

eine schematische Explosionszeichnung eines Dokumentkörpers,

Fig. 2

eine schematische Darstellung eines Dokumentkörpers, korrespondierend mit der Explosionsansicht nach Fig. 1;

Fig. 3

eine schematische Draufsicht auf die Vorderseite im Auflicht;

Fig. 4

eine schematische Ansicht der Erfassung der Rückseite im Auflicht;

Fig. 5

eine schematische Ansicht der Erfassung der Vorderseite im Durchlicht;

Fig. 6a, 6b

Ansichten der kurzen Stirnseiten des Dokumentkörpers nach Fig. 2 in der Grundorientierung;

Fig. 7a, 7b

Ansichten der kurzen Stirnseiten des Dokumentkörpers nach Fig. 2 nach einer Rotation um 180° um die Hauptträgheitsachse I;

Fig. 8a, 8b

schematische Ansichten der Stirnseiten des Dokumentkörpers nach Fig. 2 nach einer Rotation aus der Grundorientierung um 180° um die Hauptträgheitsachse II;

Fig. 9a, 9b

schematische Ansichten der kurzen Stirnseiten des Dokumentkörpers nach Fig. 2 nach einer Rotation um 180° um die Hauptträgheitsachse III;

Fig. 10

eine schematische Draufsicht auf eine mit einem Kennungsdruck versehene Dokumentlage; und

Fig. 11

eine schematische Ansicht der kurzen Stirnseiten von nebeneinander gestapelten Dokumentkörpern.

The invention is explained in more detail below with reference to a drawing. Here show:

1

a schematic exploded drawing of a document body,

2

a schematic representation of a document body, corresponding to the exploded view 1 ;

3

a schematic plan view of the front in reflected light;

4

a schematic view of the detection of the back in reflected light;

figure 5

a schematic view of the detection of the front side in transmitted light;

Figures 6a, 6b

Views of the short end faces of the document body 2 in the basic orientation;

Figures 7a, 7b

Views of the short end faces of the document body 2 after a rotation of 180° around the main axis of inertia I;

Figures 8a, 8b

schematic views of the end faces of the document body 2 after a rotation of 180° from the basic orientation around the main axis of inertia II;

9a, 9b

Schematic views of the short end faces of the document body 2 after a rotation of 180° around the main axis of inertia III;

10

a schematic plan view of a document layer provided with an identification print; and

11

a schematic view of the short end faces of document bodies stacked next to one another.

In 1 An exploded drawing of a document body 1 as a lamination body 10 is shown schematically, which is laminated from document layers 20 . In the illustrated embodiment, the lamination body 10 includes a top transparent layer 30, a front opaque layer 40, a transparent middle layer 50, also referred to as an identifier layer, a back opaque layer 60, and a bottom transparent layer 70. These are shown in FIG sequentially laminated to form the lamination body 10 . This lamination is preferably done in a high pressure, high temperature process. Most preferably, all of the document layers 20 are made of the same plastic material, such as polycarbonate.

On a front side 41 of the front opaque layer 40, a printed marking 45, here the letter "V" as an example, is printed. Any information can be printed or applied to this layer 40 and other security elements and features can also be formed. Correspondingly, a rear marking print, here as the letter "R", is printed on an underside 62 of the rear opaque layer 60 . This letter "R" is shown upside down to indicate that it is printed on the back/underside 62 of the rear opaque sheet 60.

On a sheet surface 51 of the transparent middle sheet is applied an identifier print 100 for forming end identifiers on the short ends, ie, a left short end 13 and a right short end 14 (see Fig 2 ). In this embodiment, the identification print 100 is designed in such a way that an upper long end face 16 and a lower long end face 17 (cf 2 ) no end face identifier can be recognized (ie detected). In other embodiments, the identifier can be printed in such a way that one or both of the long end faces 16, 17 can also see (ie, detect) end face identifiers. The signature print 100 extends from the left edge 53 of the ply surface 51 of the signature ply 50 to the right edge 54 which is diametrically opposite the left edge 53 .

The identification print 100 comprises a wide stripe 110 in a first color indicated by squares. The wide strip 110 runs obliquely from the left edge 53 to the opposite right edge 54, beginning near the top edge 56 on the left side 53 and ending near a center 55 of the right edge 54. Parallel underneath, two narrow stripes 120, 130 in a second color, shown by circles, and a third color, shown by triangles, are printed on the ply surface 51 of the identifier ply. The wide strip and the two narrow strips 120, 130 are oriented parallel to one another. The narrow stripe 130 furthest from the top edge 56 begins above a center 58 of the left edge 53 and ends at the opposite right edge adjacent the bottom edge 57. The second color narrow stripe 120 lies between the wide stripe 110 and the lower narrow stripe Stripe 130. The identification print is designed to extend along both the left edge 53 and the opposite right edge 54. FIG. This means that in the laminated document body 1 on the short end face 13 and the opposite short end face 14 an identifier is used as an end face identifier 412 or as an additional end face identifier 423 (cf Figures 6a-9b ) can be detected when looking at or detecting the left end face 13 or the right short end face 14 .

Because the identification print 100 extends away from the respective edge 53 or 54 on the layer surface 51 of the identification layer 50, it is not possible to remove the end page identifier 412 or 423 by milling off an edge or an end face of the document body 1 and /or to be replaced by another one which is applied, for example printed, to the left short end face 13 or right short end face 14 .

Even if such a manipulated end face identifier were applied to the left short end face 13 or the right short end face 14, this would be recognizable if the end face identifier 412, 423 that can be perceived thereby is compared with the entire identifier print 100 and checked for plausibility.

In 2 Figure 1 shows the resulting document body 1, which is a lamination body 10 of layers 20 laminated on top of one another, with its main axes of inertia I 210, II 220, III 230. These each run through the center of the document body 1 and the main axis of inertia I 210 also through the centers of the short end faces 13, 14, the main axis of inertia II 220 also through the centers of the long end faces 16, 17 and the main axis of inertia III 230 through the center of the upper side 11 or .Bottom 12.

In 3 the detection of the upper side 11, ie the front side, of the document body 1 in reflected light is shown schematically. A light source 310 illuminates the top 11 of the document body 1. A detection device 320, for example a camera, detects the front or top 11 of the document body 1. The captured view 420 of the top (front) is shown on the right in incident light, ie in reflection. The foreground marking "V" can be seen in front of the background, which is formed by the material of the front opaque layer 40 (cf 1 ) is formed. The identification print 100 is not recognizable.

The same applies when the back is viewed or recorded in reflected light, ie in reflection. This is shown schematically in 4 shown. The light source 310 again illuminates the document body 1, in this case from the underside 12 or rear side. The detection device 320, ie the camera, detects the back or underside 12 from the same side from which the document body 1 is exposed. The captured image 340 of the underside (rear side) is shown on the right in reflected light, ie in reflection. The marking print 65 on the back, which schematically represents the letter "R", can be seen. This can be seen against the uniform background, which is formed by the opaque material of the rear opaque layer 60 (cf 1 ) is specified. It is clear to the person skilled in the art that the front marking print and the rear marking print are only indicated here as examples and any printing techniques and motifs can be applied to the upper side 41 of the front opaque layer or to the lower side 62 of the rear opaque layer 60 .

In figure 5 is shown schematically the detection of the top 11, ie the front side, of the document body 1 in transmitted light. The light source 310 illuminates the document body 1 from the back 12. The camera, which is the capturing device 320, captures the top 11 of the document body 1, ie the front. On the right, the view 350 of the front (top) is shown in see-through (ie in transmission). On the one hand, the front marking print 45 in the form of the letter "V" can be seen. In addition, however, the wide strip 110 and the two narrow strips 120, 130 can also be seen in transmitted light, at least as a contrast, but usually also as a color shimmer. The first color is represented here by unfilled squares, the second color by unfilled circles and the third color by unfilled triangles. In addition, the reverse marking print in the form of the upside down letter "R" shown in dashed lines can be seen.

In Figures 6a, 6b; Figures 7a, 7b; Figures 8a, 8b and Figures 9a, 9b are views of the two opposing short end faces 13, 14 of the document body 1 for different orientations of the document body 1 are shown. In 2 the viewing direction or direction of acquisition AA and the viewing direction or direction of acquisition BB are indicated and in Figures 6a and 6b the corresponding views of the left short end 13 and the right short end 14 schematically for basic orientation according to FIG 2 shown. The end face identifiers 412 and 423 are clearly visible.

In Figures 7a and 7b correspondingly, the view 410 of one end face and the view 420 of the opposite end face are shown when FIG 2 the document body is rotated 180° about the principal axis of inertia I 210. The viewing directions or directions of detection AA and BB are not changed by the rotations, respectively. Accordingly, in Figures 8a and 8b the one end view 410 and the opposite end view 420 are shown when the document body is shown in FIG 2 is rotated by 180° about the main axis of inertia III 230 starting from the basic orientation shown in the figure.

Accordingly, in 9a, 9b the view 410 of one end face and the view 420 of the opposite end face are shown accordingly when the document body 1 is changed from the basic orientation as shown in FIG 2 is shown rotated about the main axis of inertia II 220 by 180°.

It is easy to see that the orientation of the document body can be recognized from the drawn end face identifier 412 and the additional end face identifier 423 .

In 10 a schematic top view of an identification layer 50 can be seen, which as an identification print 100 adjacent to the left edge 53 has a curved colored flag 140 with a black stripe 141, a red stripe 142 and a golden (yellow) stripe 143. From the right edge 55 towards the middle extends a completely black, also curved further flag 150. If this identification layer is laminated into a document body in such a way that the layer surface 51 of the printed identification layer 50 is inside the Document body 1 is located, an end face identifier can be seen on a short end face, which changes from black to red to yellow, whereas another end face identifier with a continuous black stripe can be seen on the opposite end face.

If the end face identifiers of one short end face and the opposite short end face differ, then in a stack 500 of document bodies 1, as shown in 11 is shown, incorrectly oriented or incorrect document bodies 1 ′ can be recognized in a simple manner, since their end face identifier 412 ′ differs from the end face identifiers 412 of the other documents 1 .

It will be appreciated by those skilled in the art that exemplary embodiments are shown herein. Particularly stable embodiments can be realized if the identification is printed on the basis of the same plastic material as the document layers to which the identification is applied or with which the identification is covered. Particularly preferred are document bodies made from sheets made of polycarbonate. The identification print is preferably applied to one of these layers with a print, for example an ink jet print using a print preparation or ink which is also produced on the basis of polycarbonate or a polycarbonate derivative. Printing inks with a binder made of a polycarbonate derivative are particularly suitable. A binder is particularly preferably formed with a polycarbonate derivative based on a geminally disubstituted dihydroxydiphenylcycloalkane. Under high pressure and at a temperature between 120°C and 230°C, polycarbonate sheets printed with such an ink can be bonded together to form an integral document body with no phase transitions evident at the original sheet transitions in the plastic structure are. However, the material layers corresponding to the original layers can still be identified, for example due to the different filling or non-filling in the case of transparent material layers in the document body.

The document bodies described here can also have a different number of layers. Furthermore, any other security features can be entered into the document body.

On the one hand, the identification print can be carried out with colorants that represent body colors. Alternative embodiments may also include luminescent colorants. These can be transparent, for example, in the visible spectrum of light in transmission and reflection. However, if these are irradiated with UV light of a specific wavelength, they emit light in the visible wavelength range. Other luminescent substances are also possible which have a so-called up-conversion property and emit light in the visible wavelength range when excited in the IR range. In these embodiments, in which the luminescent colorants can only be excited with UV light, the identification print cannot be seen either in reflected light or in transmitted light when using light in the visible wavelength range. Even the end face identifier cannot be recognized when using light in the visible wavelength range. If, on the other hand, ultraviolet light is radiated in, both the face identification and the identification print can be recognized equally in reflected and transmitted light.

Embodiments are also possible in which the identifier is printed both with body colors and with luminescent colorants. In embodiments in which the luminescent colorants of the identification print having body colors can only be excited with light in the non-visible wavelength range, i.e. with UV or IR light, the identification print is preferably covered on the top and bottom of the document body by an opaque layer, which obscures the identification print when viewed in reflected light with light in the visible wavelength range. However, the layers are preferably designed in such a way that the identification print can be detected in transmitted light when viewed with light in the visible wavelength range. The layers can be designed in such a way that when the luminescence is excited, this luminescence and thus also the identification print can be detected via the upper side and/or the lower side. Other embodiments can provide that the luminescence light can only be detected via the front sides of the document body, although the identification print can be detected via the top and bottom sides due to the body color in transmitted light. This can be achieved in that the layers covering the identification print on the top and bottom of the document body absorb the wavelengths of luminescent light, but not all wavelengths of visible light.

However, embodiments are also possible in which the identification print is covered by opaque layers or layers of material on the top and bottom so that it cannot be detected either in transmitted light or in incident light. This applies both to embodiments in which the identification print can be excited to luminescence and to embodiments in which the identification print has no luminescent means.

Reference List

1.1'

document body

11

top

12

bottom

13

left short front side

14

right short front

16

upper long face

17

lower long face

20

(Document) Layers

30

upper transparent layer

40

anterior opaque layer

41

top

45

front marking print ("V")

50

transparent middle layer / identification layer

51

ply surface

53

left edge

54

right edge

55

center (right edge)

56

upper edge

57

lower edge

58

center (left edge)

60

rear opaque layer

62

bottom

65

reverse marking print ("R")

70

lower transparent layer

100

ID print

110

wide stripe in a first color (■/□)

120

narrow stripe in a second color (•/∘)

130

narrow stripe in a third color (▲/△)

140

curved colored flag

141

black stripe

142

red stripe

143

golden (yellow) stripe

150

another curved black flag

210

first main axis of inertia I

220

second principal axis of inertia II

230

third main axis of inertia III

310

light source

320

detection device (camera)

330

captured image of the top (front) in reflected light (in reflection)

340

Captured image of the underside (rear side) in reflected light (in reflection)

350

captured image of the top (front) in transmitted light (in transmission)

410

View of one end

412, 412'

face ID

420

View of the opposite end

423

further face ID

500

Document body stack

Claims (10)

Document body (1) with counterfeit-proof end face identifier (412, 423). a flat laminating body (10) formed from a plurality of thin sheets (20) laminated face to face, said laminating body (10) having a top (11) and an opposite bottom (12) and between said top (11) and the bottom (12) at least one end face (13, 14, 16, 17) of the lamination body is formed, the surface area of which is less than the surface area of the top (11) and the bottom (12), with an identifier is formed inside the lamination body (10) so that it can be detected optically on the at least one end face (13, 14, 16, 17), characterized in that the identifier is printed on a layer surface (51) of one of the layers (50) as an identifier print (100), the one layer surface (51) being arranged inside the lamination body (10) and the identifier print (100) being on the layer surface ( 51) up to the at least one end face (13, 14, 16, 17). Document body (1) according to Claim 1, characterized in that one of the layers (50) and another of the layers (40) laminated directly onto the layer surface (51) printed with the identification print (100) are produced on the basis of the same plastic material and that the print preparation used to print the identifier (100) is also made on the basis of the same plastic material. Document body (1) according to claim 1 or 2, characterized in that the one of the layers (50) and the one further of the layers (40) are formed from polycarbonate and the identification print (100) is printed with a printing preparation which is provided with a Binder is formed with a polycarbonate derivative based on a geminally disubstituted dihydroxydiphenylcycloalkane. Document body (1) according to any one of the preceding claims, characterized in that between the top (11) of the lamination body (10) and the identification print (100) and the underside (12) of the lamination body (10) and the identification print (100) in each case at least one of the layers (20; 30, 40, 60, 70) has sufficient opacity that, in incident light detection, in which illumination with visible light and optical detection take place from the same side of the lamination body (10), the identification print (100) cannot be detected. Document body (1) according to Claim 4, characterized in that the opacities of the layers (20) of the document body (1) are selected in such a way that, in transmitted light detection with light in the visible wavelength range, in which the document body (1) is between the illumination source (310 ) and the detection device (320), at least one contrast caused by the identification print (100) can be detected. Document body (1) according to one of the preceding claims, characterized in that the identification print (100) extends perpendicularly from the at least one end face (13, 14, 16, 17) of the document body (1) by at least 1 cm, more preferably at least up to the middle of the a printed ply surface (51), or more preferably over the entire printed ply surface (51) of the one ply (50) from the at least one face (13) to an opposite face (14), on the printed surface ply (50). Method for producing a document body (1) with a forgery-proof end face identifier (412, 423) comprising the steps: providing a plurality of laminae (20); Laminating the plurality of thin layers (20) with their surfaces on top of one another, so that a thin lamination body (10) is formed which has a top (11) and has an opposite underside (12), and wherein at least one end face (13, 14, 16, 17) of the lamination body is formed between the top (11) and the underside (12), the surface area of which is less than the surface area of the top ( 11) and the bottom (12), and Forming the end face identifier (412, 423) inside the lamination body (10) so that it can be optically detected on the at least one end face (13, 14, 16, 17), characterized in that to form the end face identifier, an identifier is printed on a layer surface (51) of one of the layers (50) as an identifier print (100) before lamination, and during lamination another of the layers (40) is laminated directly onto this printed layer surface (51), so that the printed one layer surface (51) is arranged inside the lamination body (10), the identification print (100) extending on the printed layer surface (51) up to the at least one end face (13, 14, 16, 17). Method according to Claim 7, characterized in that the identification print (100) is carried out up to the edge (53) of one layer surface (51) or the identification print (100) is divided when the document body (1) is separated. Method according to Claim 7 or 8, characterized in that the identification print (100) is carried out as a color print. Method according to one of Claims 7 to 9, characterized in that the identification print (100) is carried out as a barcode or striped pattern.

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