DE102018131818A1 - Process for producing a laminate and laminate, as well as security or value document with an internal security feature - Google Patents

Abstract

The invention relates to a method for producing a laminate (11) with an internal security feature (12), in which at least one translucent or opaque substrate layer (14) is provided, in which at least one further translucent or transparent layer (21, 22) is provided , in which the at least one substrate layer (14) and the at least one further layer (21, 22) are brought together and laminated together to form a laminate (11), with the at least one in an upper side (17) and / or lower side (18) Before the substrate layer (14) is brought together with the at least one further translucent or transparent layer (21, 22), depressions (16) are introduced which place at least one transparent or translucent layer (21, 22) on the top side (16) provided with depressions (16). 17) and / or underside (18) of the substrate layer (14) and at least a subset of the depressions (16) with the at least one transparent and / or he translucent layer (21, 22) is filled.

Description

The invention relates to a method for producing a laminate with an internal security feature and a laminate with such an internal security feature.

From the DE 10 2011 004 935 A1 is known a laminate with an internal security feature. This laminate comprises a middle opaque substrate layer and further layers which are applied to an outside of the substrate layer and which are transparent and / or translucent. Microperforations are made in the opaque substrate layer. These microperforations are filled with the at least two outer layers covering the microperforation.

There is an ongoing need to create security features of this type for security documents that have increased security against forgery and make manipulation more difficult.

The invention has for its object to provide a method for producing a laminate and a laminate as well as a value or security document, in which an internal security feature enables increased security against forgery and manipulation.

This object is achieved by a method for producing a laminate with an internal security feature, in which the laminate comprises at least one translucent or opaque substrate layer and at least one further translucent or transparent layer which are laminated to form a laminate, with an upper side and / or depressions are introduced into an underside of the at least one substrate layer before being brought together with the at least one further transparent or translucent layer and then the at least one transparent or translucent layer is applied to the top side and / or underside of the substrate layer provided with depressions and at least a partial amount of the depressions with which at least one transparent or translucent layer is filled. As a result, an internal security feature, which is preferably designed as a see-through feature, is created at least by the subset of the filled depressions. Different optical transmittances can also be achieved through the recesses introduced, so that a see-through feature in the form of a watermark can thereby be formed. This inspection feature can be designed in a general or individualized form, for example as a serial number, image, logo, name, description and / or the like. If the substrate layer is opaque, the at least one further layer can be translucent or transparent. If the substrate layer is translucent, the at least one further layer can be transparent or the at least one further translucent layer can be designed with a higher light transmittance than that of the substrate layer.

It is preferably provided that the depression of the substrate layer is produced by partially removing a material of the substrate layer. For example, such a partial removal can be achieved by drilling, countersinking or by means of laser radiation, in particular a CO ₂ laser. Chemical processes can also be used to achieve partial removal.

Alternatively, it can be provided that the depressions in the substrate layer are produced by partially displacing material of the substrate layer. Embossing or stamping or the like can be provided here.

At least a subset of the depressions, in particular all depressions in the top and / or underside of the translucent or opaque substrate layer, are filled with at least one further transparent or translucent layer covering the depressions during lamination. A monochrome see-through feature can thereby be created in the laminate. The layer covering the depressions can preferably have a translucency or opacity that differs from the substrate layer.

Alternatively, it can be provided that after the recesses have been introduced into the at least one translucent or opaque substrate layer and before being brought together with the at least one further translucent or transparent layer, a predetermined number of the recesses are partially or completely filled with at least one functional material. This enables various characteristics to be achieved. For example, a security feature can be partially colored and partially non-colored. In addition, depending on the introduction of the functional materials, security features can also be created with different optical signals when excited with a wavelength and / or a magnetic force. Fluorescent or luminescent materials can be provided as functional materials. A magnetic material or a material provided with metal particles or any combination thereof can also be provided.

Furthermore, it can preferably be provided that the depressions are partially or completely filled with the functional material. The security against counterfeiting can thereby be increased, for example in that a depression or a certain number or selection of depressions is only half full and a further number or selection of depressions is completely filled. Further variations in the degree of filling of the depressions are also possible.

Furthermore, it is preferably provided that one or more functional materials are applied to the depressions and to surface sections which extend between the depressions. Individual surface sections can thus be completely covered with at least one functional material and depressions. As a result, further design variants of the internal security feature can be created.

It is preferably provided that the at least one functional material is applied by knife coating, printing or foiling.

Preferred printing methods are e.g. High pressure (letterset), gravure (raster gravure) or planographic printing (offset) as well as non-impact printing processes such as inkjet printing.

A further advantageous embodiment of the method provides that different gray levels are produced in the at least one translucent or opaque substrate layer by adapting the size, the depth, the shape of the degree of filling and / or the areal density of the depressions. In this way, for example, a grayscale curve or a type of shading can be created with such a see-through feature, in particular with the same transmission properties of the transparent or translucent layer to be applied.

The laminate is preferably produced from at least one substrate layer and at least one transparent or translucent layer, the substrate layer having a higher melting point than the at least one further layer. As a result, the depressions are largely maintained during the lamination of the at least one further layer to the substrate layer in order to maintain the shape and / or shape of the at least one security feature.

A further advantageous embodiment of the method provides that a pattern or a grid with a material which has a higher melting point than the opaque is applied to an upper side and / or lower side of the substrate layer before the depressions are applied to the at least one opaque or translucent substrate layer or has a translucent substrate layer and the pattern or grid remains when the at least one depression is introduced into the top and / or bottom of the opaque or translucent substrate layer. For example, such a pattern or grid can be formed by geometric shapes such as lines, squares, triangles or the like. This applied pattern or grid consists, for example, of silver or another metallic material. Other materials with a higher melting point than the substrate layer can also be provided. To connect the individual geometric shapes to form a security feature, at least one recess can be made in between. The at least one depression in the opaque or translucent substrate layer is only removed in the non-coated area. The pattern or grid applied remains on the substrate layer. Subsequently, this top and / or bottom, which comprises the applied pattern with the depressions, can be covered and laminated with a translucent or transparent layer.

The object on which the invention is based is further achieved by a laminate with an internal security feature, in which the laminate has at least one translucent or opaque substrate layer and at least one translucent or a transparent layer which are laminated, recesses being made in the substrate layer, and at least a subset of the filled depressions forms the internal security feature. This internal security feature is protected against manipulation due to the translucent or transparent layer applied to it. In addition, a security feature that can be verified in transmitted light can be created, the effort for counterfeiters is significantly increased or makes a counterfeit easily visible.

It is preferably provided that the at least one depression of the opaque or translucent substrate layer is filled with the at least one further transparent or translucent layer. This represents a simple design of such an internal security feature in the laminate.

The depressions of the translucent or opaque substrate layer are preferably partially or completely filled with at least one functional material. Fluorescent or luminescent materials can be provided as functional materials. A magnetic material or a material provided with metal particles or any combination thereof can also be provided. For example, by changing the degree of filling in the respective recess, a specific optical property can be achieved, for example, by changing the degree of transmission. In addition, a one or multicolored see-through feature can be created in which the functional features, such as colored particles, are selected.

Furthermore, it is preferably provided that a predetermined number or selection of the recesses introduced are filled. This also increases the security against counterfeiting with a corresponding selection in the number of filled-in depressions.

Furthermore, it is preferably provided that a layer of a functional material is provided, which at least partially covers the depressions as well as the surface sections lying between them. The depressions and the intermediate surface sections can also be at least partially or additionally covered with the at least one transparent or translucent layer.

The object on which the invention is based is achieved by a value or security document which has a laminate with an internal security feature, the laminate consisting of at least one translucent or opaque substrate layer and at least one transparent or translucent layer which are laminated together, in which at least one substrate layer is provided with recesses and at least a subset of the recesses in the at least one substrate layer are filled with the at least one transparent or translucent layer and form the internal security feature. Due to this internal feature, manipulation is easily visible. The effort for counterfeiters is significantly increased.

• 1 eine schematische Schnittansicht eines ersten Arbeitsschritts zur Herstellung eines Laminats,
• 2 eine schematische Schnittansicht eines zweiten Arbeitsschrittes zur Herstellung eines Laminats,
• 3 eine schematische Schnittansicht einer ersten Ausführungsform des Laminats,
• 4 eine schematische Schnittansicht einer mit Vertiefungen versehenen Substratschicht für einen Laminat,
• 5 eine schematische Schnittansicht eines Arbeitsschrittes zum Verfüllen der Vertiefungen in der Substratschicht,
• 6 eine schematische Schnittansicht einer alternativen Ausführungsform zum Verfüllen der Vertiefungen der Substratschicht wie in 5,
• 7 eine schematische Schnittansicht des Laminats nach den Arbeitsschritten in 4 und 6,
• 8 eine schematische Schnittansicht auf ein innenliegendes Sicherheitsmerkmal des Laminats gemäß 3, und
• 9 eine schematische Ansicht auf eine Substratschicht zur Herstellung eines alternativen innenliegenden Sicherheitsmerkmals.

The invention and further advantageous embodiments and developments thereof are described and explained in more detail below with reference to the examples shown in the drawings. The features to be gathered from the description and the drawings can be used according to the invention individually or in groups in any combination. Show it:

• 1 1 shows a schematic sectional view of a first working step for producing a laminate,
• 2nd 2 shows a schematic sectional view of a second working step for producing a laminate,
• 3rd 2 shows a schematic sectional view of a first embodiment of the laminate,
• 4th 1 shows a schematic sectional view of a substrate layer provided with depressions for a laminate,
• 5 2 shows a schematic sectional view of a work step for filling the depressions in the substrate layer,
• 6 is a schematic sectional view of an alternative embodiment for filling the depressions of the substrate layer as in 5 ,
• 7 is a schematic sectional view of the laminate after the steps in 4th and 6 ,
• 8th is a schematic sectional view of an internal security feature of the laminate 3rd , and
• 9 is a schematic view of a substrate layer for producing an alternative internal security feature.

In the 1 to 3rd The following is a method for producing a laminate 11 with an internal security feature 12 described, which includes the individual steps below:

First, a substrate layer 14 provided. This substrate layer 14 can be designed as an opaque or translucent layer. This substrate layer 14 can have a thickness of 50 to 300 micrometers, preferably a thickness of 70 to 200 micrometers and in particular a thickness of 80 to 150 micrometers. For example, this substrate layer 14 made of a thermoplastic polymer material, in particular polycarbonate.

In a first step according to 1 becomes this substrate layer 14 edited to deepen 16 bring in. These recesses 16 can be designed as blind holes. Likewise, the wells 16 be semicircular or arcuate in shape. Further geometrical shapes of the depressions 16 are possible. In any case, a perforation, i.e. a fully formed through hole, is not under a depression 16 to understand.

In a first embodiment, the recess 16 by a partial removal of the material of the substrate layer 14 respectively. For example, drilling or countersinking can be provided. In particular, processing is carried out using a laser beam. The size, depth and / or shape can be determined depending on the number of pulses or the power of the laser beam and the focusing of the laser beam. Especially when designing an opaque substrate layer 14 can be done by varying the depth, diameter and / or shape of the recesses 16 a different gray level for an internal security feature 12 be achieved.

In the embodiment according to 1 are the recesses 16 only on a top 17th brought in. Alternatively, these depressions can only be on one underside 18th be introduced. Furthermore, it can be provided that both on the top 17th on the bottom as well 18th the wells 16 are provided. These are preferably matched to one another in order to avoid a through hole. In addition, a certain degree of transmission can again be achieved for an internal security feature.

In 2nd a second step is shown schematically. At least on those with recesses 16 provided top and / or bottom 17th , 18th the substrate layer 14 becomes another layer 21st upset. This layer 21st can be translucent or transparent. Several, differing layers can also be used 21st be applied. In the embodiment is both on the top 17th on the bottom as well 18th the substrate layer 14 one additional layer each 21st , 22 fed.

The at least one substrate layer 14 preferably has a higher melting point than at least one further transparent or translucent layer 21st , 22 on.

In a subsequent step according to 3rd the layers are laminated 21st , 22 and with the substrate layer 14 to the laminate 11 . In this lamination process, the indentations 16 through the at least one layer 21st filled. This creates a through the wells 16 formed internal security feature 12 . This internal security feature 12 can be designed like a watermark. If the layers used do not include coloring, the design of the depressions can 16 a security feature 12 can be achieved with different shades of gray, since larger depressions appear brighter in transmitted light than smaller depressions or depressions with a shallow depth.

The other translucent or transparent layers 21st , 22 which the laminate 11 v can also be made of a thermoplastic polymer material such as the substrate layer 11 exist, the melting point of the substrate layer 14 higher than the other layers 21st , 22 is. This also has the advantage that a type of monolithic laminate can be formed after lamination. The other layers 21st , 22 can have the same transmittance or differ from each other.

Such a laminate 11 can be designed as a security document. Security documents include, for example, ID documents, passports, ID cards, identification cards, driver's licenses, vehicle licenses, vehicle letters, registration certificates, company ID cards, bank cards or credit cards, access cards, visas, but also anti-counterfeiting labels, admission cards, bank notes, postage stamps, securities or the like.

Among the thermoplastic polymer materials for such a laminate 11 are understood materials that are plastically deformable in a certain temperature range. Examples of thermoplastic polymer materials are polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyvinyl chloride (PVC), acrylonitrile butadiene styrene (ABS), polyamides (PA), polyacetate (PLA), polymethyl methacrylate (PMMA), polycarbonate (PC), polyethylene (PE), polypropylene (PP), polystyrene (PS), polyether ketone (PEEK).

Thermoplastic elastomers (TPE), in particular thermoplastic polyurethane (TPU), can also be used as thermoplastic materials for producing a laminate 11 be used.

The material layer for the at least one further layer 21st , 22 can range from 10 to 200 microns, preferably 20 to 70 microns.

A layer is called transparent, which light, i.e. electromagnetic radiation, a wavelength or a wavelength range in the form of directed radiation. Directional radiation has an intensity distribution that has a high intensity only in a coherently limited solid angle range. Under the other solid angles, the intensity is essentially weaker, usually by several orders of magnitude, preferably close to zero. If such directed radiation passes through a transparent material, the property is retained that the intensity is concentrated in a limited solid angle range. The solid angle range can increase, but there is no significant diffuse scattering. A weakening with regard to an intensity of the radiation passing through the transparent area or the transparent spatial area can, however, occur. Imaging according to the geometric optics is possible through a transparent material.

By contrast, translucent is a material in which the described property of maintaining the directional characteristic is no longer present. Mainly by diffuse scattering, radiation that was originally directed becomes radiation whose intensity distribution is clearly perceptible in a large solid angle range Intensity. An increase in intensity in or around the angular range that can be associated with the original direction of propagation of the directed radiation is possible, but is no longer several orders of magnitude.

The property which is transmitted light, i.e. electromagnetic radiation, at least for one wavelength or one or more wavelength ranges. When deciding whether an object or a spatial area is transparent or opaque, it is important that the wavelength or wavelength range for which this property is examined or applies is specified. There are a large number of materials which are transparent, for example in the visible wavelength range, but are opaque in the ultraviolet wavelength range.

Information such as opaque, translucent and transparent relates in each case to the property of the material layer after lamination or, in the case of a substrate layer, to the property of the material layer formed therefrom after lamination.

In the 4th to 7 are individual steps for the production of an alternative laminate 11 to 3rd shown. In 4th is the substrate layer 14 already processed and has deepening 16 on. These recesses 15 can be made as in the embodiment described above. These recesses 16 can alternatively to the embodiment according to 1 be introduced by embossing, stamping or the like. In the latter case, material is displaced around the recesses 16 to train. Subsequently, according to a first embodiment in 5 the wells 16 as well as surface sections 23 between the wells 16 lying, coated with a functional material and filled. For example, this full-area filling of the depressions and the full-area application of the functional material can be formed by knife coating, screen printing, foiling or by known printing processes and the like.

Alternatively, according to 6 be provided that only the wells 16 be filled. This can be done, for example, by non-contact high-performance syringes, in particular jetting, or by introducing balls or the like. In the embodiment according to 6 can also be provided that each recess 16 includes a certain degree of filling. For example, adjacent depressions 16 have different degrees of filling. Likewise, individual sections can be made up of recesses 16 have a specific degree of filling, the depressions provided by the degree of filling in an adjacent section 16 deviates.

For example, colors can be provided as functional materials. A fluorescent, luminescent, magnetic and / or metallic material can also be introduced. This is followed by the substrate layer 14 with the filled wells 16 at least one more layer 21st upset. A transparent layer is preferred 21st applied as a top layer or top layer. The individual layers are then laminated 21st , 22 and 14 to a laminate 11 according to 7 .

In 8th Fig. 3 is a schematic view of an example internal security feature 12 of the laminate 11 shown. This view shows a security feature 12 which, for example, according to the 1 to 3rd is built and manufactured. Due to the different size, depth, shape, degree of filling and / or areal density of the depressions 16 For example, you can create a letter, shown here as "B". This can have a clearly visible border. This border is made by indentations 16 formed, which are large and / or deep in diameter. Shading can be provided within the border by providing smaller depressions and / or depressions with a smaller depth.

In 9 is a schematic view of a substrate layer 14 with an alternative embodiment of an internal security feature 12 in 8th shown. On the substrate layer 14 a pattern or a grid is applied, in particular printed. For example, there is a grid of square or rectangular areas 26 formed, which consist for example of silver. This is followed by removal of the substrate layer 14 carried out by means of a laser. The resulting deepenings 16 are each in a corner region of the square surface in the exemplary embodiment 26 intended. Since the laser power of the laser beam is set such that material of the substrate layer 14 can be removed, but the material of the grid 25th is not influenced, the example shown can be produced in which a recess 16 four corner areas of the square surfaces 26 connects with each other. This represents only one of many exemplary embodiments for the production of an internal security feature 12 represents which wells 16 are involved. It is understood that there are other internal security features 12 with the wells 16 can be combined, connected or integrated with each other.

Reference symbol list

11.

Laminate

12.

Security feature

14.

Substrate layer

16.

deepening

17th

Top of 14

18th

Bottom of 14

21st

layer

22.

layer

23.

Surface section

25th

Grid

26.

Rectangular surface

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included 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

• DE 102011004935 A1 [0002]

Claims (16)

Method for producing a laminate (11) with an internal security feature (12), - in which at least one translucent or opaque substrate layer (14) is provided, - in which at least one further translucent or transparent layer (21, 22) is provided, in which the at least one substrate layer (14) and the at least one further layer (21, 22) are brought together and laminated together to form a laminate (11), characterized in that - in an upper side (17) and / or lower side (18) recesses (16) are introduced into the at least one substrate layer (14) before being brought together with the at least one further translucent or transparent layer (21, 22), and - that the at least one transparent or translucent layer (21, 22) is applied to the recesses (16) provided top (17) and / or bottom (18) of the substrate layer (14) and at least a subset of the depressions (16) with the at least one tran sparent and / or translucent layer (21, 22) is filled. Procedure according to Claim 1 , characterized in that the depressions (16) in the substrate layer (14) are produced by a partial removal of a material of the substrate layer (14). Procedure according to Claim 1 , characterized in that the depressions (16) in the substrate layer (14) are produced by partially displacing a material of the substrate layer (14). Method according to one of the preceding claims, characterized in that the depressions (16) of the substrate layer (14) are filled with the at least one further transparent or translucent layer (21, 22) during lamination. Method according to one of the preceding claims, characterized in that after the recesses (16) have been introduced into the substrate layer (14) and before being brought together with the at least one further translucent or transparent layer (21, 22), at least a subset of the recesses (16 ) be provided with at least one functional material. Method according to one of the preceding claims, characterized in that at least a partial amount of the depressions (16) in the substrate layer (14) are filled with a predetermined degree of filling with at least one functional material. Method according to one of the preceding claims, characterized in that in the recesses (16) and on surface sections (23) which extend between the recesses (16), the at least one functional material is applied. Procedure according to one of the Claims 5 to 7 , characterized in that colored particles, fluorescent, luminescent, magnetic and / or metallic material is applied as the functional material. Procedure according to one of the Claims 5 to 8th , characterized in that the at least one functional material is applied by knife coating, printing or foiling. Method according to one of the preceding claims, characterized in that the internal security feature (12) in the at least one substrate layer (14) with different shades of gray by adjusting the size, depth, shape, degree of filling and / or the areal density of the depressions (16), in particular with the same transmission properties of the transparent and / or translucent layer (21, 22) to be applied. Method according to one of the preceding claims, characterized in that the laminate (11) is produced from the at least one substrate layer (14) and the at least one transparent or translucent layer (21, 22), the substrate layer (14) having a higher melting point than which has at least one transparent or translucent layer (21, 22). Method according to one of the preceding claims, characterized in that, before the recesses (16) are applied to the at least one translucent or opaque substrate layer (14) on the substrate layer (14), a grid (25) is applied with a material which has a higher Has melting point as the material of the substrate layer (14) and the grid (25) remains when the recesses (16) are introduced into the substrate layer (14). Laminate with an internal security feature (12), - with at least one translucent or opaque substrate layer (14), - with at least one Translucent or transparent layer (21, 22) which are laminated to form a laminate (11), characterized in that - in the at least one substrate layer (14) recesses (16) are made, and at least a subset of the recesses (16) in the at least one substrate layer (14) is filled with the at least one translucent or transparent layer (21, 22) and the filled depressions (16) form the internal security feature (12). Laminate after Claim 13 , characterized in that at least a subset of the depressions (16) in the at least one substrate layer (14) is partially or completely filled with at least one functional material. Laminate after Claim 13 characterized in that the depressions (16) of the substrate layer (14) are partially or completely filled with a functional material and the surface sections lying between the depressions (16) are at least partially filled with the functional material and / or with at least one transparent or translucent layer ( 21, 22) are covered. Security or value document with an internal security feature (12), in which at least one translucent or opaque substrate layer (14) is connected to at least one translucent or transparent layer (21, 22) to form a laminate (11), characterized in that in the at least one substrate layer (14) has recesses (16) and at least a subset of the recesses (16) in the at least one substrate layer (14) are filled with the at least one translucent or transparent layer (21, 22) and the filled recesses (16 ) form the internal security feature (12).

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