EP2475811A2

EP2475811A2 - Adhesive biluminescent fibers

Info

Publication number: EP2475811A2
Application number: EP10754420A
Authority: EP
Inventors: Per KRÜGER; Alexander MOMBRÉE
Original assignee: Bundesdruckerei GmbH
Current assignee: Bundesdruckerei GmbH
Priority date: 2009-09-08
Filing date: 2010-08-27
Publication date: 2012-07-18
Anticipated expiration: 2030-08-27
Also published as: EP2475811B1; WO2011029543A3; CN102482802A; CA2768601C; CA2768601A1; AU2010294594B2; CN102482802B; WO2011029543A2; DE102009040747B3; AU2010294594A1

Abstract

The invention relates to fluorescent colored fibers which are labeled with a first luminescent substance and which consist at least to some extent of an adhesive, to a film comprising colored fibers and to a document having said colored fibers. The invention further relates to methods for producing fluorescent colored fibers, to a method for producing a film having fluorescent colored fibers and to a method for producing a document having fluorescent colored fibers. The invention provides a particularly forgery-proof and easy-to-produce security feature for documents of value and security documents.

Description

Federal German Embroidery GmbH

BD-0055/09 / P12.170WO

Biluminescent mottling fibers

FIELD OF THE INVENTION This invention relates to fluorescent mottled fibers which are labeled with a first luminescent substance and which are at least partially composed of an adhesive, as well as a mottled film and a document having such mottling fibers. Furthermore, the invention relates to a method for producing the fluorescent mottled fibers, a method for producing the sheet with the fluorescent mottled fibers and a method for producing the document with the fluorescent mottled fibers.

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

From 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 dyeing 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.

DE 37 19 48 A discloses a process for the production of yeast-forming mottling fibers. 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 EP 1 268 935 B1, a security paper with mottled fibers is known in which differently luminescent mottled fibers are introduced for the purpose of coding into different subregions of the paper. The luminescent substances can be introduced into the mottled fibers or applied only superficially to them. Bundesdruckerei GmbH

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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. For example, EP 1 268 935 B1 discloses only striped patterns. 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 be reproduced. From DE 103 24 630 A1 a security paper with at least one type of mottled fibers for the production of value documents from security paper, such as banknotes, is 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 melts preferably in the temperature range of 95 to 150 ° C. 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 special geometric shape, and information can 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. Bundesdruckerei GmbH

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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 fluorescent mottled fibers according to claim 1, a mottled film according to claim 13, a document with fluorescent mottled fibers according to claim 18, a process for producing mottled fluorescent fibers according to claims 21 and 23, a process for producing a film with fluorescent mica fibers according to Claim 25 and a method for producing a document with fluorescent mottled fibers according to claim 31 solved. 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 according to the invention have 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 the second excitation conditions are not identical, and the first and the second excitation conditions Bundesdruckerei GmbH

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Minuscule light differ spectrally. Furthermore, the mottled fibers at least partially consist of an adhesive.

An advantage of the fluorescent mottled fibers according to the invention consists in the integration facilitated by the adhesive in plastic-based documents and the increased security against counterfeiting by the distinguishable colors of the luminescent light under the first and second excitation conditions. Further, the adhesive results in a permanent bond between the mottled fibers and the document, so that mottled fibers according to the present invention can not be removed from a document, and thus a counterfeit document can not be faked.

In a preferred embodiment of the mottled fibers, these have at least a first partial area and at least one second partial area. 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 subareas 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 Bundesdruckerei GmbH

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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 exciting 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 selection of the 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 with 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 at 365 nm but only at 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, if appropriate, 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. 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 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 Bundesdruckerei GmbH

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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, like two cores, be enveloped by a shell from the at least one first subarea, comparable to a conduit 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 hotmelt 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 include LUMILUX® CD740 (red) and CD702 (green) from Honeywell. Pigments having 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. Bundesdruckerei GmbH

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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 of 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 μιτι and preferably in the range of 50 to 60 pm. The cross-sectional shape is preferably round (circular) or oval.

Furthermore, the invention relates to a film according to the invention comprising fluorescent mica fibers, on the surface of which the mottled fibers are attached by means of the glue of the mottling fibers. The film is preferably 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 (PVA) PS), polyvinylphenol (PVP), polypropylene (PP), polyethylene (PE), thermoplastic elastomers (TPE), in particular 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 addition, the film may also consist of paper. Bundesdruckerei GmbH

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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 comprising the mottled fibers, the various types of mottled fibers according to the invention are arranged in different spatial structures. For example, the mottled fibers are applied to the film in the form of strips, so that there are first strip-shaped regions on the film in which there is a first type of mottled fibers, there are second strip-shaped regions on the film, in which there is a second type of mottled fibers - is, and third strip-shaped areas 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 according to the invention. 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

(Game) token, banknote, check, stamp and tax code. 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. Bundesdruckerei GmbH

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The inventive method for producing fluorescent mottled fibers according to the invention 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 spinneret to form at least a second portion of the spinneret colored 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 emits second luminescent light under second excitation conditions, wherein the first and the second excitation conditions are not identical and the first and the second luminescent light 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 according to the invention, 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 Polymers encased. 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 Bundesdruckerei GmbH

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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 interlayer fibers comprises providing the film, applying fluorescent mottled fibers according to the invention to the film and fixing the fluorescent mottling fibers on 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 roll laminator so that the glue of the mottled fibers 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 to the film in strip form. Bundesdruckerei GmbH

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introduced. 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 in 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 part It 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 inventive method for producing a document with fluorescent Melierfasem comprises collating at least one inventive Melierfasern having film and optionally at least one further film and laminating the collated 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.

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;

Fig. 3: Production of a film with mottled fibers in a schematic representation in cross section;

Fig. 4: Preparation of a document with Melierfasern in a schematic Dar- position in cross section;

Fig. 5: a document with mottled fibers in a schematic representation in

Top view;

Fig. 6: another document with mottled fibers in a schematic representation in plan view; Bundesdruckerei GmbH

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7 shows a further production path 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 mottled fibers 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 is shown in cross section, which consists solely 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.

FIG. 1 b shows a further mottling fiber 10. 1, which consists of a first sub-area 11. 1 and a second sub-area 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.

FIG. 1c shows a further mottling fiber 10.2, which consists of a first subregion 11.2, a second subregion 12.2 and a third subregion 13.2. For example, a first luminescent substance in the second portion 12.2 and a Bundesdruckerei GmbH

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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 is 10.3 shown, which consists of a first portion 11.3, a second portion 12.3 and a third portion 13.3. The construction of this mottled fiber corresponds to that of the mottled fiber of FIG. 1c, wherein the second partial region 12.3 and the third partial region 13.3 are separated by the first partial region 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.

FIG. 1e shows a further mottling fiber 10.4, which consists of a first subregion 11.4, a second subregion 12.4, a third subregion 13.4 and a fourth subregion 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.

FIG. 1f shows a further mottling fiber 10.5. 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 Bundesdruckerei GmbH

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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.

FIG. 1g shows a further mottling fiber 10.6, which has a first partial region 11.6 consisting of adhesive, as well as two second partial regions 12.6 and two third partial regions 13.6. This form represents a combination of the mottled fibers illustrated in FIGS. 1d and 1f, which combines the advantages of simple and reliable verification and low-jetting production.

In FIG. 2, a mottled fiber 10.2 according to FIG. 1c is 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, the production of a film with melier fibers according to the invention is shown schematically 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 partial region 31 to a temperature at which the hot-melt 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. Bundesdruckerei GmbH

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In Fig. 4 the production of a document according to the invention with mottled fibers according to the invention 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, in this case two films 35 and 36, for example collected in a pile. 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. FIG. 5 shows a top view of a document 40 with mottling fibers 42 according to the invention. 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 partial areas can, 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.

FIG. 6 shows another document 50 with mottling fibers 53, 54 according to the invention in plan view. The mottling fibers 53 are located on a first partial surface 51 of the document 50, and the mottling 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, the production of another film with mooring fibers fixed thereon is shown schematically 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 Bundesdruckerei GmbH

BD-0055/09 / P12.170WO

In step (c), the mottled fibers are fixed in certain predetermined partial areas on the film, i. the fixation is structured, so that the mottled fibers are connected to the film 30 only in the partial surfaces 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

Bundesdruckerei GmbH BD-0055/09 / P12.170WO Claims:

1. Fluorescent mottled fibers, wherein the mottled fibers are labeled with a first luminescent substance, wherein the first luminescent substance emits first luminescent light under first excitation conditions and wherein the mottled fibers at least partially consist of an adhesive, characterized in that the mottled fibers are marked with a second luminescent substance the second luminescent substance emits second luminescent light under second excitation conditions such that the first and the second excitation conditions are not identical and that the first and the second luminescent light differ spectrally.

2. Fluorescent mottled fibers according to claim 1, characterized in that the mottled fibers have at least a first portion and at least a second portion that the portions are arranged transversely to the fiber side by side, that the at least one first portion consists of an adhesive that the at least one first partial area and / or the at least one second partial area is marked with the first luminescent substance and that the at least one first partial area and / or the at least one second partial area is marked with the second luminescent substance.

3. Fluorescent mottled fibers according to one of the preceding claims, characterized in that the first excitation conditions for exciting the first luminescent substance comprise light having wavelengths in the range from 380 to 300 nm.

4. Fluorescent mottled fibers according to one of the preceding claims, characterized in that the second excitation conditions for exciting the second luminescent substance comprise light having wavelengths in the range from 320 to 300 nm.

5. Fluorescent mottled fibers according to one of the preceding claims, characterized in that the at least one second portion of the at least one first portion is sheathed.

6. Fluorescent mottled fibers according to one of the preceding claims, characterized in that the at least one first portion contains the first luminescent substance and the at least one second portion contains the second luminescent substance.

7. Fluorescent mottled fibers according to one of the preceding claims, characterized in that the at least one first portion contains the first luminescent substance and the at least one second portion contains the first and the second luminescent substance.

8. Fluorescent mottled fibers according to one of the preceding claims, characterized in that the mottled fibers further comprise at least a third portion and that the at least one second portion and the at least one third portion of the at least one first portion are sheathed.

9. Fluorescent mottled fibers according to claim 8, characterized in that the at least one second portion contains the first luminescent substance and the at least one third portion contains the second luminescent substance.

10. Fluorescent mottled fibers according to one of the preceding claims, characterized in that the adhesive is a hot-melt adhesive or a reactive adhesive.

11. Fluorescent mottled fibers according to one of the preceding claims, characterized in that the luminescent substances are inorganic pigments.

12. Fluorescent mottled fibers according to one of the preceding claims, characterized in that the at least one second portion of polyamide or a polyamide copolymer.

13. The mottled film, characterized in that the mottled fibers are the fluorescent mottled fibers according to any one of claims 1 to 12 and that the mottled fibers are fixed on the surface of the film by means of the glue of the mottled fibers.

14. Melierfasern having film according to claim 13, characterized in that the mottled fibers are spatially structured on the surface of the film.

The mottled film according to any one of claims 13 and 14, characterized in that at least two different types of fluorescent mottled fibers are attached to the surface of the film.

16. Melierfasern having film according to claim 15, characterized in that the different types of Melierfasern are arranged differently spatially structured.

17. A mottled film according to claim 16, characterized in that a first type of mottled fibers form a pattern on at least a first partial surface of the film and a second type of mottled fibers on at least a second partial surface of the film.

18. The fluorescent mottled fiber document according to any one of claims 1 to 12.

19. Document according to claim 18, characterized in that the document has a laminated card body.

20. A document according to any one of claims 18 and 19, characterized in that the document is a value or security document.

21. A method for producing fluorescent mottled fibers by 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 identical at least one second polymer is extruded through at least one second spinneret to form at least a second portion of the mottled fibers, wherein the at least one first polymer contains a first luminescent substance which emits first luminescent light under first excitation conditions and wherein as first and / or second polymer an adhesive is selected, characterized in that the first polymer and / or the second polymer contains a second luminescent substance which emits second luminescent light under second excitation conditions, that the first and the second excitation conditions are not identical and that the first and the second luminescent light spectrally differ ,

22. The method according to claim 21, characterized in that the at least one second subregion is encased by the at least one first subregion.

23. A method of producing fluorescent mottled fibers by extruding at least one second polymer through at least one spinneret to form at least a second portion and then encasing the at least one second portion having at least a first portion with a first polymer, wherein the first polymer is an adhesive the at least one second polymer contains a second luminescent substance which emits second luminescent light under second excitation conditions, characterized in that the first polymer and / or the second polymer contains a first luminescent substance which emits first luminescent light under first excitation conditions, that the first and the second Excitation conditions are not identical and that the first and the second luminescent light spectrally differ.

24. The method according to claim 23, characterized in that the sheathing takes place by means of dip coating.

25. A process for producing a film with fluorescent mottled fibers, comprising the following steps:

a) providing the film, Bundesdruckerei GmbH

BD-0055/09 / P12.170WO

b) applying the fluorescent mottled fibers according to any one of claims 1 to 12 to the film and

c) fixing the fluorescent mottled fibers on the foil.

A method according to claim 25, characterized in that the mottled fibers are fixed by means of heat or UV radiation.

Method according to one of claims 25 and 26, characterized in that the mottled fibers are applied only to at least a first partial surface of the film and then fixed.

Method according to one of claims 25 and 26, characterized in that the mottled fibers are fixed only on at least a first partial surface of the film.

A method according to any of claims 27 and 28, characterized in that the mottled fibers fixed on the at least one first partial surface of the film are first mottling fibers and second mottling fibers are fixed on at least a second partial surface of the film, the second mottling fibers being of the first mottling fibers differ.

A method according to claim 29, characterized in that the first mottled fibers form a pattern on the at least one first partial surface of the film and the second mottle fibers on the at least one second partial surface of the film.

Method for producing a document with fluorescent mottled fibers comprising the following steps:

a) gathering at least one film produced by a process according to any one of claims 25 to 30 and optionally at least one further film and

b) laminating the collated films. A method according to claim 31, characterized in that after lamination at least one document is cut or punched out of the laminate.