EP2475811B1 - Foil comprising adhesive biluminescent fibers - Google Patents

Description

Field of the invention

The invention relates to a film having fluorescent mottled fibers which are marked with a first luminescent substance and which at least partially consist of an adhesive and a method for producing the fluorescent mottling fibers.

State of the art

The prior art discloses processes for the production of luminescent mottling fibers and processes for their introduction, in particular into papers, during their production.

From the DE 41 33 977 A1 a process for dyeing organic fibers is known, which is distinguished from the prior art, the spin dyeing, by the staining of small amounts of fiber with an aqueous solution of a cationic polymer and then with an aqueous suspension of a pigment. The particles which can be used for staining should if possible have a particle size <10 μm.

From the DE 37 19 48 A For example, a process for producing yeast-forming mottled fibers is known. Such mottled fibers release paint upon drying of the paper into which the mottled fibers are introduced so that a mound is formed around the mottling fibers so that the removal of fibers can be readily observed.

From the EP 1 268 935 B1 a security paper with mottled fibers is known in which various luminescent mottled fibers for the purpose of coding in different Subsections of the paper are introduced. The luminescent substances can be introduced into the mottled fibers or applied only superficially to them.

In WO 98/54413 A1 are a security paper and its manufacturing method described. A thread is glued by means of an adhesive on the paper and pressed into this. The thread may be provided with the adhesive prior to application to the paper. It can have fluorescent properties. The thread may be interrupted and formed by a plurality of individual elements.

Out US 4,756,557 A It is also known to protect security documents such as banknotes with security strips against counterfeiting. Such strips may preferably be formed by co-extruded multicomponent synthetic filaments whose individual components contain, for example, fluorescent substances. For example, these strips are placed in the paper pulp during manufacture of the banknote paper so that they are partially exposed on the surface of the finished sheet.

As luminescent properties, for example, the luminescence wavelength or the decay time of the luminescence radiation are mentioned. Disadvantage of this prior art is that the nature of the introduced pattern is severely limited. So are in the EP 1 268 935 B1 only striped pattern revealed. Furthermore, the method for producing such a security paper can not be used for the production of plastic-based documents, since the mottling fibers are loose on a solid plastic surface and would therefore be distributed randomly and thus the applied pattern would not reproduce.

From the DE 103 24 630 A1 is a security paper with at least one type of mottled fibers for the production of documents of value from security paper, such as banknotes known. The mottled fibers contain luminescent substances with characteristic luminescence properties. These mottled fibers may be embodied as bicomponent fibers, forming a core-shell structure. It is particularly advantageous if the jacket is low-melting and preferably in the temperature range of
95 to 150 ° C melts. These fibers have improved adhesion in the substrate, with the mottled fibers being added during papermaking. The production of the mottled fibers can be done, for example, by melt spinning, wet spinning or dry spinning. The mottled fibers have a particular geometric shape, and information may be encoded in this geometric shape. The disadvantage, however, is that a verification of such fibers requires technical aids and is time-consuming. For example, the shape of the mottled fibers can be observed under a light microscope. However, this method is not suitable for rapid verification, for example, at a point of sale.

Problem of the prior art and object of the invention

The prior art mottling fibers have the problem that they can easily be readjusted by the impression of a fluorescent color. To do this, a counterfeiter prints the image of randomly distributed fibers onto a counterfeit document using a dye. Such counterfeits can be detected only with effort, for example with the aid of a microscope.

Another problem with prior art mica fibers is their incorporation in plastic-based documents, particularly in documents made by lamination of plastic films. With known methods, the laminating fibers are sprinkled on one of the films and thus give a random pattern. The problem here, however, is that the fibers, unlike papermaking, have no adhesion to the films unless they are laminated. As a result, it can be seen that a great many fibers are distributed through the production plants and thus incorporated into other products which are to contain no or other mottling fibers.

It is therefore the object of the invention to provide mottling fibers which are easy to verify, easy to apply in a structured manner and, in particular, can also be integrated into plastic documents.

Description of the invention and preferred embodiments

These objects are achieved by a film comprising fluorescent mottled fibers according to claim 1 and a method for producing a film with fluorescent mottled fibers according to claim 10. Preferred embodiments of the invention are specified in the subclaims.

The aforementioned objects are achieved according to the invention in that the mottled fibers contain at least two luminescent substances and have an adhesive.

The fluorescent mottled fibers comprise a first and a second luminescent substance. The first luminescent substance emits first luminescent light under first excitation conditions and the second luminescent substance emits second luminescent light under second excitation conditions. Here, the first and second excitation conditions are not identical, and the first and second luminescent lights differ spectrally. Furthermore, the mottled fibers at least partially consist of an adhesive. The mottled fibers are attached to the surface of the film by means of the glue of the mottled fibers, the film being a plastic film and the mottled fibers arranged in a random pattern on the film.

An advantage of the fluorescent mottled fibers is the ease of integration into plastic-based documents facilitated by the adhesive and the increased protection against forgery by the distinguishable colors of the luminescent light under the first and second excitation conditions, respectively. Furthermore, the glue leads to a permanent bond between the mottled fibers and the document, so that the mottled fibers can not be removed from a document and thus a counterfeit document can not be faked.

The mottled fibers have at least a first portion and at least a second portion. The subregions are arranged side by side transversely to the fiber direction and preferably parallel to one another. For example, one portion forms the left half and the other the right half of the fiber, or one portion encloses the other portion, such as a lead in a cable encased in insulation. The at least one first portion consists of an adhesive. The at least one first partial region and / or the at least one second partial region is marked with the first luminescent substance, and the at least one first partial region and / or the at least one second partial region is marked with the second luminescent substance. Two sub-areas have the advantage that it can lead to a spatial separation of the different luminescent areas, which is visually easy to verify. Both luminescent substances can thus be present in the same and / or different subregions.

Here and below, the term "first sub-areas" is understood to mean areas which are preferably identical in terms of substance but spatially separated from one another. The same applies to the second and possibly third and other sections. Thus, all the first subregions preferably have the same material quality, which clearly distinguishes them from all second and other subregions. For example, a spun mica fiber may consist of at least two separate but interwoven filaments. threads which are materially the same, are regarded as equal subareas, for example as first subareas.

In a preferred embodiment of the mottled fibers, the first excitation conditions for excitation of the first luminescent substance comprise light having wavelengths in the range from 380 to 300 nm. In particular, the first luminescent substance can be excited with UV-A and UV-B radiation, in particular with 365 nm and 316 nm. With a suitable choice of materials or a near-surface introduction of the mottled fibers, excitation by means of UV-C radiation with wavelengths up to 200 nm, in particular 254 nm, can take place.

In a further preferred embodiment of the mottled fibers, the second excitation conditions for exciting the second luminescent substance comprise light having wavelengths in the range from 320 to 300 nm. In particular, the first luminescent substance can not be excited with UV-A but only with UV-B radiation, in particular not with 365 nm but only with 316 nm.

In a further preferred embodiment of the mottled fibers, the at least one first partial area encloses the at least one second partial area and optionally further partial areas. For example, the at least one second subregion forms a core, while the at least one first subregion encases this as a cladding, such as, for example, a cable in a cable is encased by an insulation.

The at least one first partial region contains the first luminescent substance and the at least one second partial region contains the second luminescent substance.

In a further preferred embodiment of the mottled fibers, the at least one first partial region contains the first luminescent substance and the at least one second partial region contains the first and the second luminescent substance.

In a further preferred embodiment of the mottled fibers, these furthermore have at least a third subregion, wherein the at least one second subregion and the at least one third subregion is encased by the at least one first subregion. In this case, the at least one second and the at least one third subregion can be adjacent to one another or adjacent to one another or spaced apart from one another and separated from one another by the at least one first subregion.

By way of example, the at least one second subarea and the at least one third subarea may, as two cores, be enveloped by a shell from the at least one first subarea, comparable to a cable with two cables. It follows automatically that a plurality of second and / or third and optionally further sub-areas is conceivable. If the second subareas are labeled A and the third subregions are B, then the pattern ABA or the pattern ABAB for the individual strands in the mottled fibers can be obtained, for example, these three or four subsections in total consisting of a first, consisting of an adhesive Subarea are sheathed.

In a further preferred embodiment of the mottling fibers, the mottling fibers or at least the at least one first portion of the mottling fibers consist of an adhesive. The adhesive may be a hot melt adhesive or a reactive adhesive. For example, the hot-melt adhesive has a softening temperature of 50 to 200 ° C, preferably from 80 to 120 ° C, on. The reactive adhesive is for example an acrylate adhesive. The adhesive is preferably not tacky at room temperature. Thus, the mottled fibers can be well singulated during processing at room temperature.

In a further preferred embodiment of the mottling fibers, the luminescent substances are inorganic pigments. In particular, the luminescent substances may be rare earth-doped oxides, oxinates, sulfides, oxysulfides, phosphates or vanadates. In particular, europium, gadolinium, terbium, dysprosium, holmium, erbium and thulium are used for rare-earth doping. Examples of possible pigments are LUMILUX® CD740 (red) and CD702 (green) from Honeywell. Pigments with a particle size of less than or equal to 10 μm, preferably less than or equal to 8 μm, and particularly preferably less than or equal to 6 μm, are advantageous. The inorganic pigments have a temperature stability which is above the softening temperature of the polymer used.

In a further preferred embodiment of the mottling fibers, the at least one second portion consists of polyamide (PA) or a polyamide copolymer. In particular, the polyamides PA12, PA6 and PA6.6 can be used. PA6 is formed by ring-opening polymerization from ε-caprolactam. PA6.6 (Nylon®) is prepared from hexamethylenediamine and adipic acid by polycondensation with elimination of water. It is also possible to use polyethylene (PE), polyethylene terephthalate (PET), polyvinyl chloride (PVC), cellulose and derivatives thereof, for example viscose or cellophane. However, polyamide is preferred because this material has the least interaction with the usual laser systems used in the personalization of documents. In particular, when PA is used, the document material is also blackened as desired by the laser beam in which areas there are mottled fibers.

The mottled fibers can be chosen differently with regard to their shape and geometry. For characterization, the length, the diameter and the cross-sectional shape of the mottled fiber are generally used. A typical length of mica fiber is in the range of 2 to 25 mm, preferably about 6 mm. The diameter is for example in the range of 20 to 150 microns, and preferably in the range of 50 to 60 microns. The cross-sectional shape is preferably round (circular) or oval.

Furthermore, the invention relates to a film having fluorescent mottled fibers, on the surface of which the mottled fibers are attached by means of the glue of the mottling fibers. The film is a plastic film which is preferably made of polycarbonate (PC), in particular bisphenol A polycarbonate, polyethylene terephthalate (PET), derivatives thereof such as glycol modified PET (PETG), polyethylene naphthalate (PEN), polyvinyl chloride (PVC) , Polyvinyl butyral (PVB), polymethyl methacrylate (PMMA), polyimide (PI), polyvinyl alcohol (PVA), polystyrene (PS), polyvinylphenol (PVP), polypropylene (PP), polyethylene (PE), thermoplastic elastomers (TPE), especially thermoplastic polyurethane (TPU), acrylonitrile-butadiene-styrene (ABS), Teslin® and their derivatives. Further, it may be a coextruded film and other hybrid materials containing, among others, the aforementioned materials.

In a further preferred embodiment of the film comprising the mottled fibers, the mottled fibers are spatially structured on the surface of the film. For example, the mottled fibers are applied to the foil in the form of strips, so that there are strip-shaped regions on the foil in which mottled fibers are present, and strip-shaped regions in which no mottled fibers are present. Further, the areas having mottled fibers may take the form of coats of arms, seals or other patterns, for example.

In a further preferred embodiment of the film comprising the mottled fibers, at least two different types of fluorescent mottled fibers are attached to the surface of the film.

In a further preferred embodiment of the film having the mottled fibers, the various types of mottled fibers are arranged differently spatially structured. For example, the mottled fibers are applied to the foil in the form of strips so that there are first strip-shaped regions on the foil in which there is a first sort of mottling fibers, there are second strip-shaped regions on the foil in which a second kind of mottling fibers are present and third strip-shaped regions in which no mottled fibers are present. Further, the regions having a particular type of mottled fibers may take the form of coats of arms or seals, for example, while the other species may be applied flat, for example.

Furthermore, the invention relates to a document with fluorescent mottled fibers. The document is preferably a value or security document. Examples of value or security documents are passport, identity card, driver's license, visa, check and credit card, company ID card, proof of eligibility, membership card, gift and shopping voucher as well as token, banknote, check, stamp and tax stamp. In particular, the document has a laminated card body. Examples of documents with a laminated card body are especially check and credit card, as well as the German driver's license.

The method of making fluorescent mottled fibers comprises extruding at least one first polymer through at least one first spinneret to form at least a first portion of the mottled fibers and optionally simultaneously extruding at least one second polymer through at least one second spinnerette to form at least a second portion of the mottled fibers. The at least one first polymer contains a first luminescent substance which emits first luminescent light under first excitation conditions. As the first and / or second polymer, an adhesive is selected. In addition, the first polymer and / or the second polymer contain a second luminescent substance, which under second excitation conditions second luminescent light
emitted, wherein the first and the second excitation conditions are not identical and the first and the second luminescence differ spectrally. When only a first polymer is extruded, the first polymer contains the first and second luminescent substances. For example, when a first polymer and a second polymer are extruded, the first polymer may contain the first luminescent substance and the second polymer may contain the second luminescent substance, or the first polymer may contain the first luminescent substance and the second polymer may contain the first and second luminescent substances.

In a further preferred embodiment of the method for producing fluorescent mottled fibers, the at least one second subregion is encased by the at least one first subregion. This can be achieved, for example, by a suitable arrangement of the spinnerets familiar to the person skilled in the art. For example, six first spinnerets may be disposed around a second spinnerette.

In a further preferred embodiment of the method, fluorescent mottled fibers are produced in a first step by extruding at least one second polymer through at least one spinneret to form at least a second subregion and in a subsequent second step the at least one second subregion comprising at least a first subregion of a first polymer jacketed. The first polymer in this case is an adhesive. The at least one second polymer contains a second luminescent substance which emits second luminescent light under second excitation conditions. Furthermore, the first polymer and / or the second polymer contain a first luminescent substance which
is emitted under first excitation conditions first luminescent light, wherein the first and the second excitation conditions are not identical and the first and the second luminescence light spectrally differ. For example, mottled fibers can be produced by a known method in the first method step. These are encased in the second step with an adhesive which contains the first luminescent substance. The sheathing can be done for example by dip coating.

The mottled fibers produced by one of the aforementioned methods can be cut to a desired length in a further step, if this is not already done during the production, but the mottled fibers are produced as continuous thread. Usually the length of a mottled fiber is about 6 mm.

The method according to the invention for producing a film with fluorescent mottled fibers comprises providing the film, applying fluorescent mottled fibers to the film and fixing the mottled fluorescent fibers to the film.

In a preferred embodiment of the method for producing the film, the mottled fibers are fixed by means of heat and / or UV radiation. For example, after the application of the fluorescent mottled fibers, the film is passed under an IR emitter or passed through a roller laminator so that the mica fiber adhesive softens or liquefies, thus fixing the mottled fibers to the film. Alternatively, after the application of the mottled fibers, the film may be placed in an oven which heats the film to a temperature which is above the softening temperature of the glue but below the softening temperature of the film. Alternatively or additionally, after the application of the mottling fibers, the film can be conducted under a UV emitter in order to activate the reactive adhesive of the mottling fibers and thus to achieve the fixation of the mottling fibers on the film.

In a further preferred embodiment of the method for producing the film, the mottling fibers are applied only to at least a first partial area of the film. For example, the mottled fibers are applied in strips to the film. This can be done for example by spraying, spreading or printing. The mottled fibers can also be applied, for example, in the form of coats of arms or seals. This can be done by stamping or printing.

In a further preferred and the above-described alternative embodiment of the method for producing the film, the mottled fibers are applied over the entire surface of the film. However, the mottled fibers are only fixed on at least a first part surface of the film. This takes place, for example, via locally varying irradiation with IR or UV light, so that only mottled fibers are fixed in the at least one first partial area on the film. The mottled fibers which have not been fixed are subsequently removed from the film, for example by inverting the film or by blowing off or sucking off the unfixed mottling fibers.

In a further preferred embodiment of the method for producing the film, two types of mottling fibers are applied to the film. The first type of mottled fibers are applied to at least a first portion of the film and a second type of mordant fibers are applied to at least a second portion of the film. The first and second varieties of mottled fibers differ. In particular, the two varieties have different fluorescences, so that they can be easily recognized and distinguished in a visual control under UV excitation. Further, the first and second varieties of mottled fibers may also differ in the geometry of the fibers. For example, they may have a different length, shape and / or a different diameter. Likewise, the first and second varieties of mottled fibers may also differ only by one forensic feature added to one type, for example an up-conversion phosphor, so that this difference can only be observed in a specially equipped laboratory.

In a further preferred embodiment of the method for producing the film, the at least one first partial area and the at least one second partial area form a pattern. Examples of such patterns are coats on a substrate, wherein the coat of arms consists of first partial surfaces with a first color and the background of second partial surfaces with a second color. Another example of a pattern is the value on a banknote. The at least one second subarea may comprise or surround the at least one first partial surface or vice versa. However, the at least one first and the at least one second partial surface are not identical. This is the case, for example, if the first partial surface comprises the entire surface of the film and the at least one second partial surface only a part of the surface, for example in the form of a coat of arms. For example, the first partial areas may be a subset of the second partial areas, so that the coat of arms results from the mixture of the first and the second color on a background of the second color.

The method for producing a document with fluorescent mottled fibers comprises gathering at least one film having mottled fibers and optionally at least one further film and laminating the gathered films.

In a preferred embodiment of the method for producing the document, at least one document is cut or punched out of the laminate after lamination. This is particularly preferred when the laminate is a so-called multiple benefit. From a multiple use at least two documents (benefits) can be isolated, for example, cut or punched, be.

Fig. 1 a bis g:

Melierfasern in schematischer Darstellung im Querschnitt;

Fig. 2:

eine Melierfaser in schematischer Darstellung in Draufsicht;

Fig. 3:

Herstellung einer Folie mit Melierfasern in schematischer Darstellung im Querschnitt;

Fig. 4:

Herstellung eines Dokuments mit Melierfasern in schematischer Darstellung im Querschnitt;

Fig. 5:

ein Dokument mit Melierfasern in schematischer Darstellung in Draufsicht;

Fig. 6:

ein weiteres Dokument mit Melierfasern in schematischer Darstellung in Draufsicht;

Fig. 7:

einen weiteren Herstellungsweg einer Folie mit darauf fixierten Melierfasern in schematischer Darstellung im Querschnitt.

Embodiments of the invention will now be described with reference to the accompanying drawings. The individual figures show:

Fig. 1 a to g:

Melierfasern in a schematic representation in cross section;

Fig. 2:

a Melierfaser in a schematic representation in plan view;

3:

Production of a film with mottled fibers in a schematic representation in cross section;

4:

Preparation of a document with mottled fibers in a schematic representation in cross section;

Fig. 5:

a document with mottled fibers in a schematic representation in plan view;

Fig. 6:

another document with mottled fibers in a schematic representation in plan view;

Fig. 7:

a further production route of a film with mottled fibers fixed thereon in a schematic representation in cross section.

Like reference numerals denote like elements below.

In Fig. 1 Melierfasern are shown schematically in cross section. The sizes are not drawn to scale, but are only to illustrate their spatial arrangement to each other.

In Fig. 1a a mottled fiber 10 (not according to the invention) is shown in cross section, which consists exclusively of a first portion 11. The first part consists of an adhesive. The adhesive contains a first and optionally a second luminescent substance, with the result that the mottled fiber 10 emits luminescent light other than under second excitation conditions under first excitation conditions. Advantage of the illustrated Melierfaser 10 is the ease of production in one step. However, since the two luminescent substances are not spatially separated, an adjustment is relatively easy.

In Fig. 1 b a further Melierfaser 10.1 (according to the invention) is shown, which consists of a first portion 11.1 and a second portion 12.1. The first portion 11.1 consists of an adhesive and surrounds the second portion 12.1. For example, the adhesive consists of a hotmelt adhesive and the second portion of polyamide. For example, a first luminescent substance in the first partial region 11.1 and optionally a second luminescent substance in the second partial region 12.1 are included. An advantage of this embodiment is the easier visual recognition due to the very different intensity profile and the different spectral characteristics of the first and second luminescent light. It is also advantageous that a nondestructive separation of a Melierfaser 10.1 from a document is no longer possible due to the different properties of the materials, since the adhesive of the portion 11.1 can establish a firm bond to the document.

In Fig. 1c a further mottled fiber 10.2 (according to the invention) is shown, which consists of a first partial area 11.2, a second partial area 12.2 and a third partial area 13.2. For example, a first luminescent substance in the second portion 12.2 and a
be contained second luminescent material in the third portion 13.2. In this embodiment, the thickness of the first portion 11.2, which consists of the adhesive, could be very thin, since this only has to mediate the adhesion between the mottled fiber and the film.

In Fig. 1d a further Melierfaser 10.3 (according to the invention) is shown, which consists of a first portion 11.3, a second portion 12.3 and a third portion 13.3. The structure of this mica fiber corresponds to that of the mica fiber of Fig. 1c , wherein the second portion 12.3 and the third portion 13.3 are separated by the first portion 11.3. Such a mottled fiber can be made, for example, by bonding two mottled fibers of the prior art by means of an adhesive which forms the first portion 11.3.

In Fig. 1e a further mottled fiber is 10.4 (according to the invention) shown, which consists of a first portion 11.4, a second portion 12.4, a third portion 13.4 and a fourth portion 14.4. By way of example, the second subregion has a first luminescent substance, the third subregion has a second luminescent substance and the fourth subregion has a third luminescent substance. The first part consists of an adhesive, which can fix the mottled fiber on a foil. An advantage of this mica fiber is the presentation of three different adjacent colors, resulting in easy visual recognition. Furthermore, most national colors can already be displayed with three colors, so that, for example, a country-specific coding can be carried out.

A special case of this is a mottled fiber with a first partial region 11.4, two second partial regions 12.4 and 14.4 and a third partial region 13.4. For example, the two second partial regions contain a first luminescent substance and the third partial region contain a second luminescent substance. The first portion 11.4 consists of an adhesive.

In Fig. 1f Another mottled fiber 10.5 (according to the invention) is shown. This has a first, consisting of adhesive portion 11.5 and two second portions 12.5. For example, the first subregion 11.5 contains a first luminescent substance and the second subregions a second luminescent substance. An advantage of this embodiment
A plurality of second partial regions consists in that interruptions of strands of the second partial regions caused in the production of the mottled fibers can not be perceived visually without problems as a disturbance. Thus, the rejects are reduced.

In Fig. 1g a further mottled fiber 10.6 (according to the invention) is shown, which has a first, consisting of adhesive portion 11.6, and two second portions 12.6 and two third portions 13.6. This form represents a combination of in Fig. 1d and Fig. 1f represented mottled fibers, which combines the advantages of easy and safe verification and the low-emission production.

In Fig. 2 is a mottled fiber 10.2 according to Fig. 1 c shown in plan view. This has a first portion 11.2, which consists of adhesive. Furthermore, the mottled fiber has a second partial region 12.2, which contains a first luminescent substance, and a third partial region 13.2, which contains a second luminescent substance. The visual verification of the mica fiber results in the image of two juxtaposed, differently colored luminescent stripes. The typical length of such a mica fiber is about 6 mm on average.

In Fig. 3 schematically shows the production of a film with mottled fibers in cross-section. In the first step (a), a film 30 is provided. The film 30 may be made of PC, for example. Subsequently (step b), mottled fibers are applied which, for example, have a first partial region 31 and a second partial region 32. The first portion 31 consists of a hot melt adhesive which is not tacky at room temperature. Thus, the mottled fibers can be separated and processed. The first partial region 31 preferably contains a first luminescent substance and the second partial region 32 contains a second luminescent substance. In a following step (c), the mottled fibers are fixed, for example by heating by means of an IR lamp, which heats the first portion 31 to a temperature at which the hotmelt adhesive softens. Thus, a firm bond between the mottled fibers and the film 30 is achieved. Schematically, this is represented here by the fact that this can lead to a deformation of the first portion 31. This may be advantageous to improve the adhesion of the mica fiber to the film 30.

In Fig. 4 the production of a document with mottled fibers is shown schematically in cross-section. In a first step (a), a film 30 according to the invention with mottled fibers, which have a first partial area 31 and a second partial area 32 and which are fixed on the film 30, as well as further films, here by way of example two films 35 and 36, become a stack collected. The person skilled in conventional structures of plastic-based documents are known, with usually 3 to 15 films are used. For example, the films 30, 35, 36 are PC films which have a glass transition at about 148 ° C. These are laminated under elevated pressure and elevated temperature, usually 170 to 210 ° C, for 5 to 60 minutes (step b). It forms a monolithic card body 38. In the monolithic card body 38 are the mottled fibers, wherein the first portion 31, which consists of a hot melt adhesive, deformed and connected to the document, since the adhesive has a glass transition or melting point below the Glass transition of PC and in particular below the laminating temperature. The second partial regions can preferably be designed such that their geometric shape does not change or does not change perceptibly under lamination conditions. It is advantageous if the first subregion 31 contains a first luminescent substance and the second subregion 32 contains a second luminescent substance. The first subarea is no longer perceived as a clearly defined area during verification because it is smeared in the document during lamination. Due to the deformation of the first partial region 31, the mottled fiber can no longer be removed as a whole, but only the second partial region 32, so that an attempted manipulation becomes obvious.

It will be readily apparent to those skilled in the art that the film 35 may be, for example, a hologram, for example a volume hologram or a kinegram. Furthermore, the foil 36 may be a so-called inlay, which has a chip and an antenna for contactless communication. Such an inlay can consist of a thermoplastic elastomer, in particular thermoplastic polyurethane (TPU), or a TPU-PC composite. It is likewise known to the person skilled in the art that an adhesive can be introduced between the film 30 and the film 35 and / or the film 30 and the film 36 in order to reduce the lamination temperature.

In Fig. 5 a document 40 with mottled fibers 42 is shown in plan view. The mottled fibers are located on partial surfaces 41 of the document 40. For example, the partial surfaces are arranged in the form of a strip. The strip-shaped faces may, for example, represent a code, for example a barcode. For example, this code encodes the value of the document 40, for example a banknote. Instead of a strip-like arrangement, other shapes are also conceivable, in particular letter and / or number sequences, for example a value number or a country code.

In Fig. 6 Another document 50 with mottled fibers 53, 54 is shown in plan view. The mottled fibers 53 are located on a first partial surface 51 of the document 50, and the mottled fibers 54 are located on a second partial surface 52 of the document 50. In the illustrated case, the second partial surface 52 comprises the entire surface of the document. The mottled fibers 53 differ in the illustrated case of the mottling fibers 54 by the length. For example, the mottling fibers 53 are about 5 mm long, the mottling fibers 54 about 20 mm. The mottled fibers may differ in addition to or instead of the length, for example, in the luminescence color impression. The first partial surface 51 is shown here in a circle. However, it is easily conceivable that the first partial surface 51 takes the form of a coat of arms, a symbol, for example an eagle, or a value. Furthermore, it can easily be seen that a plurality of first partial surfaces can together represent a coat of arms or a seal, a symbol, for example an eagle, or a value number, in particular a multi-digit value number.

In Fig. 7 schematically shows the production of another film with it fixed Melierfasern in cross section. In the first step (a), a film 30 is provided. The film 30 may be made of PC, for example. Subsequently (step b), mottled fibers are applied which, for example, have a first partial region 31 and a second partial region 32. The first portion 31 consists of a hot melt adhesive which is not tacky at room temperature. Thus, the mottled fibers can be separated and processed. The first partial region 31 preferably contains a first luminescent substance and the second partial region 32 contains a second luminescent substance. The application is not structured, especially over the entire surface. In a following Step (c), the mottled fibers are fixed in certain predetermined sub-areas on the film, ie the fixation is structured so that the mottled fibers are connected to the film 30 only in the sub-areas in which they are to be applied to the film 30. The mottled fibers are fixed on the film by, for example, heating by means of an IR lamp, which heats the first portion 31 to a temperature at which the hotmelt adhesive softens. Thus, a firm bond between the mottled fibers and the plastic film 30 is achieved. The figure shows schematically that deformation of the first partial region 31 can occur in this case. This may be advantageous to improve the adhesion of the mica fiber to the film 30. In a final step (d), the unfixed mottled fibers are removed, for example by blowing off or suction.

Claims (15)

1. A foil comprising fluorescent colored fibers, wherein the colored fibers are marked with a first luminescent substance, wherein the first luminescent substance emits a first luminescent light under first excitation conditions, wherein the colored fibers at least partially consist of an adhesive, wherein the colored fibers are marked with a second luminescent substance, the second luminescent substance emits a second luminescent light under second excitation conditions, the first and second excitation conditions are not identical, the first and second luminescent lights differ spectrally, and wherein the colored fibers are fastened by means of the adhesive to the surface of the foil, wherein the foil is a plastic foil, the colored fibers are arranged on the foil in a random pattern, and the colored fibers have at least one first subregion and at least one second subregion, the subregions are arranged next to each other transverse to the direction of the fibers, the at least one first subregion consists of the adhesive, the at least one first subregion is marked with the first luminescent substance and the at least one second subregion is marked with the second luminescent substance.
2. The foil comprising fluorescent colored fibers according to claim 1, characterized in that the at least one second subregion is encased by the at least one first subregion.
3. The foil comprising fluorescent colored fibers according to any one of the preceding claims, characterized in that the at least one second subregion additionally contains the first luminescent substance.
4. The foil comprising fluorescent colored fibers according to any one of the preceding claims, characterized in that the colored fibers furthermore comprise at least one third subregion and that the at least one second subregion and the at least one third subregion are encased by the at least one first subregion.
5. The foil comprising fluorescent colored fibers according to any one of the preceding claims, characterized in that the adhesive is a hot melt adhesive or a reactive adhesive.
6. The foil comprising fluorescent colored fibers according to any one of the preceding claims, characterized in that the at least one second subregion consists of polyamide or a polyamide copolymer.
7. The foil comprising colored fibers according to any one of the preceding claims, characterized in that the colored fibers are arranged on the surface of the foil spatially structured.
8. The foil comprising colored fibers according to any one of the preceding claims, characterized in that at least two different types of fluorescent colored fibers are fastened to the surface of the foil.
9. The foil comprising colored fibers according to claim 8, characterized in that the different types of colored fibers are differently spatially structured.
10. A process for manufacturing a foil with fluorescent colored fibers comprising the following steps:

    a) providing the foil wherein the foil is a plastic foil,

    b) applying the fluorescent colored fibers in a random pattern onto the foil, wherein the colored fibers are marked with a first and second luminescent substance, the first luminescent substance emits a first luminescent light under first excitation conditions, the second luminescent substance emits a second luminescent light under second excitation conditions, the first and second excitation conditions are not identical, the first and second luminescent lights differ spectrally, wherein the colored fibers at least partially consist of an adhesive and the colored fibers comprise at least one first subregion and at least one second subregion, the subregions are arranged next to each other transverse to the direction of the fibers, the at least one first subregion consists of the adhesive, the at least one first subregion is marked with the first luminescent substance and the at least one second subregion is marked with the second luminescent substance, and

    c) fixing the fluorescent colored fibers by means of the adhesive onto the surface of the foil.
11. The process according to claim 10, characterized in that the colored fibers are fixed in place using heat or UV radiation.
12. The process according to any one of claims 10 and 11, characterized in that the colored fibers are only applied to at least one first subarea of the foil and subsequently fixed in place.
13. The process according to claim 12, characterized in that the colored fibers fixed to the at least one first subarea of the foil are first colored fibers and that second colored fibers are fixed to at least one second subarea of the foil, wherein the second colored fibers are different to the first colored fibers.
14. The process according to claim 13, characterized in that the first colored fibers on the at least one first subarea of the foil and the second colored fibers on the at least one second subarea of the foil create a pattern.
15. A process for manufacturing a document with fluorescent colored fibers including the following steps:

    a) bringing together of at least one foil according to any one of claims 1 to 9 and at least one further foil, and

    b) laminating the combined foils.

Images