EP2639075A1 - Method for producing a valuable document and valuable document derived from the method - Google Patents
Method for producing a valuable document and valuable document derived from the method Download PDFInfo
- Publication number
- EP2639075A1 EP2639075A1 EP13000930.1A EP13000930A EP2639075A1 EP 2639075 A1 EP2639075 A1 EP 2639075A1 EP 13000930 A EP13000930 A EP 13000930A EP 2639075 A1 EP2639075 A1 EP 2639075A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- radiation
- layer
- primer layer
- coating composition
- substrate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 239000008199 coating composition Substances 0.000 claims abstract description 37
- 238000003847 radiation curing Methods 0.000 claims abstract description 31
- 239000000203 mixture Substances 0.000 claims abstract description 25
- 239000000758 substrate Substances 0.000 claims description 61
- 238000000576 coating method Methods 0.000 claims description 29
- 238000004132 cross linking Methods 0.000 claims description 29
- 239000004922 lacquer Substances 0.000 claims description 26
- 239000011248 coating agent Substances 0.000 claims description 25
- 238000001035 drying Methods 0.000 claims description 22
- 239000005871 repellent Substances 0.000 claims description 17
- 238000007639 printing Methods 0.000 claims description 16
- 239000003973 paint Substances 0.000 claims description 14
- 230000005855 radiation Effects 0.000 claims description 10
- 239000002966 varnish Substances 0.000 claims description 10
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- 125000002091 cationic group Chemical group 0.000 claims 1
- 238000005510 radiation hardening Methods 0.000 abstract 7
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- 239000000126 substance Substances 0.000 description 12
- 229920000728 polyester Polymers 0.000 description 9
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- UHESRSKEBRADOO-UHFFFAOYSA-N ethyl carbamate;prop-2-enoic acid Chemical class OC(=O)C=C.CCOC(N)=O UHESRSKEBRADOO-UHFFFAOYSA-N 0.000 description 3
- 239000006224 matting agent Substances 0.000 description 3
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- 239000004721 Polyphenylene oxide Substances 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- DAKWPKUUDNSNPN-UHFFFAOYSA-N Trimethylolpropane triacrylate Chemical compound C=CC(=O)OCC(CC)(COC(=O)C=C)COC(=O)C=C DAKWPKUUDNSNPN-UHFFFAOYSA-N 0.000 description 2
- 238000003848 UV Light-Curing Methods 0.000 description 2
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- 239000000975 dye Substances 0.000 description 2
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- 238000009472 formulation Methods 0.000 description 2
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- 239000004973 liquid crystal related substance Substances 0.000 description 2
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- ZDHCZVWCTKTBRY-UHFFFAOYSA-N omega-Hydroxydodecanoic acid Natural products OCCCCCCCCCCCC(O)=O ZDHCZVWCTKTBRY-UHFFFAOYSA-N 0.000 description 2
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- ZDQNWDNMNKSMHI-UHFFFAOYSA-N 1-[2-(2-prop-2-enoyloxypropoxy)propoxy]propan-2-yl prop-2-enoate Chemical compound C=CC(=O)OC(C)COC(C)COCC(C)OC(=O)C=C ZDQNWDNMNKSMHI-UHFFFAOYSA-N 0.000 description 1
- VOBUAPTXJKMNCT-UHFFFAOYSA-N 1-prop-2-enoyloxyhexyl prop-2-enoate Chemical compound CCCCCC(OC(=O)C=C)OC(=O)C=C VOBUAPTXJKMNCT-UHFFFAOYSA-N 0.000 description 1
- XMLYCEVDHLAQEL-UHFFFAOYSA-N 2-hydroxy-2-methyl-1-phenylpropan-1-one Chemical compound CC(C)(O)C(=O)C1=CC=CC=C1 XMLYCEVDHLAQEL-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- NOWKCMXCCJGMRR-UHFFFAOYSA-N Aziridine Chemical compound C1CN1 NOWKCMXCCJGMRR-UHFFFAOYSA-N 0.000 description 1
- 239000004971 Cross linker Substances 0.000 description 1
- 206010013786 Dry skin Diseases 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 206010040880 Skin irritation Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 125000005396 acrylic acid ester group Chemical group 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- -1 acrylic acrylates Chemical class 0.000 description 1
- 239000002318 adhesion promoter Substances 0.000 description 1
- 239000002671 adjuvant Substances 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 238000007774 anilox coating Methods 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000002519 antifouling agent Substances 0.000 description 1
- 229910000410 antimony oxide Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
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- 239000011888 foil Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- DMKSVUSAATWOCU-HROMYWEYSA-N loteprednol etabonate Chemical compound C1CC2=CC(=O)C=C[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@@](C(=O)OCCl)(OC(=O)OCC)[C@@]1(C)C[C@@H]2O DMKSVUSAATWOCU-HROMYWEYSA-N 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 238000007645 offset printing Methods 0.000 description 1
- 229920002601 oligoester Polymers 0.000 description 1
- VTRUBDSFZJNXHI-UHFFFAOYSA-N oxoantimony Chemical compound [Sb]=O VTRUBDSFZJNXHI-UHFFFAOYSA-N 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000307 polymer substrate Polymers 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- VXLYKKNIXGIKAE-UHFFFAOYSA-N prop-2-enoyl 2-methylprop-2-enoate Chemical class CC(=C)C(=O)OC(=O)C=C VXLYKKNIXGIKAE-UHFFFAOYSA-N 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
- B41M7/0045—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using protective coatings or film forming compositions cured by mechanical wave energy, e.g. ultrasonics, cured by electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams, or cured by magnetic or electric fields, e.g. electric discharge, plasma
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
- B41M7/0081—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
- B42D25/29—Securities; Bank notes
-
- B42D2033/04—
Definitions
- the invention relates to a document of value, such as a banknote, a document of identification or a document, with a flat substrate, which is at least partially provided with a dirt-repellent coating in order to extend the service life and fitness for circulation.
- the invention further relates to a method for producing such a value document.
- Banknotes and other value documents are usually made of so-called security papers which have security elements or security features, such as a security thread partially introduced into the paper, a foil patch with diffraction structures or refractive structures, color shift effects or microoptical representation arrangements, or watermarks.
- security papers which have security elements or security features, such as a security thread partially introduced into the paper, a foil patch with diffraction structures or refractive structures, color shift effects or microoptical representation arrangements, or watermarks.
- the value documents are typically printed, often consuming print images are produced with technically demanding printing processes, such as intaglio.
- documents of value, such as banknotes are also characterized by a character caused partly by the paper substrate, partly by its treatment (such as one-sided or two-sided calendering in the case of steel intaglio printing), namely its grip and bending stiffness and the sound which is characteristic during deformation and wrinkling ,
- banknotes During their circulation, value documents, such as banknotes, are exposed to heavy burdens of various kinds, which limit their orbital period.
- the circulation period of a banknote depends essentially on its demand. Certain denominations are preferably used in commerce and thus have a shorter circulation time due to the greater exposure to environmental influences.
- a cause for the restriction of Orbital period are mechanical stresses due to abrasion, folding or creasing.
- the main cause of the limited circulation time of banknotes is their premature pollution. Since the paper used for banknotes is very porous, it has a large surface area and a high surface roughness. The surface roughness favors dirt deposits considerably compared to a smooth surface. Dirt can be liquid or solid, and liquid dirt in turn can be hydrophobic or hydrophilic.
- banknotes Numerous attempts have been made to extend the life of banknotes. For example, it has been proposed to make banknotes entirely from a plastic substrate (see, for example, US Pat AU 488,652 ) or to provide the banknotes with protective coatings. However, it must be taken into account that the protective equipment may not cause any change in the characteristics typical of value documents (such as sound and grip), no impairment of the safety features and no harmful environmental influences.
- the object of the present invention is therefore to provide a document of value which avoids the disadvantages of the prior art.
- the value document should preferably have the following properties:
- the radiation curing step takes place in particular by means of UV drying.
- the radiation curing of the physically dried, radiation-curing primer layer and the radiation-curing composition-based second coating composition takes place in particular at the same time in order to achieve a very high physical and chemical resistance of the layer structure.
- the hybrid paint of the first coating composition suitable for forming the primer layer comprises acrylates and / or polyester acrylates and / or urethane acrylates and / or polyester polyurethanes and / or polyether polyurethanes and / or acrylic-styrene polyurethanes.
- the hybrid lacquer of the first coating composition suitable for forming the primer layer is based on an aqueous dispersion comprising acrylates and reactive monomers and / or reactive oligomers, in particular acrylates and photoinitiators.
- the radiation-curable composition of the second coating composition suitable for forming the cover layer is a free-radically crosslinking UV varnish or a cationically crosslinking UV varnish.
- the physically dried, radiation-curable primer layer may be provided, in part, with an additional UV-crosslinking print layer having indicia and / or patterns prior to applying the second coating composition suitable for forming the second cover layer.
- the second coating composition applied to the substrate to form the cover layer may be partially provided with an additional UV-crosslinking print layer having indicia and / or patterns prior to the radiation curing step.
- the cover layer may be provided with an additional, in particular UV-curing or oxidatively drying, print layer which has characters and / or patterns.
- the inventive method can be performed according to a further preferred embodiment so that the flat substrate obtained has an optically variable anti-counterfeiting agent, which is provided on its surface for increasing the fouling resistance with a high-gloss paint, wherein the high-gloss paint has a layer thickness in a range of 0.7 to 1.5 microns, and the planar substrate is at least partially provided on its surface located outside the optically variable counterfeit securing means with the dirt-repellent coating having a primer layer and a cover layer.
- a second aspect of the invention relates to a value document, such as a banknote, obtainable by the method according to the first aspect of the invention.
- the primer layer can be colorless or transparent. However, the primer layer can also be colored, ie color components which are selected in particular from the group consisting of interference pigments, liquid crystal pigments, luminescent substances, IR-absorbing substances, organic and / or inorganic colored pigments or dyes.
- the primer layer may be present over the entire surface or may be present partially, ie, in regions or in the form of a plurality of individual regions. In addition, it is possible the primer layer has both transparent and colored areas.
- the cover layer may in particular be a UV lacquer or UV top lacquer or a UV-drying ink.
- the cover layer may be transparent or colored, i. Contain color components which are selected in particular from the group consisting of interference pigments, liquid crystal pigments, luminescent substances, IR-absorbing substances, organic and / or inorganic colored pigments or dyes.
- the cover layer can be present all over or partially, i. in regions or in the form of several individual areas. In addition, it is possible that the cover layer has both transparent and colored areas.
- the cover layer may contain antistatic agents.
- antistatic agents for example, the attraction of dust and the adhesion of hygienic contaminants can be avoided.
- Suitable antistatic formulations for paints and varnishes are known in the art, see for example the DE 10 2006 045 869 A1 in which ionic liquids or solutions of salts in ionic liquids are used as antistatic agents.
- antistatics based on ammonium salts which are especially dissolved in water and / or alcohol
- antimony oxide or indium tin oxide coated mica from Merck can be used.
- the provision of antistatics to the cover layer is advantageous in order to avoid the sticking or blocking of printed products, such as banknotes, caused by electrostatic charging.
- the primer layer can be present in part and in particular be colored. It is preferred that the cover layer in this case is present over the entire surface and in particular is transparent.
- the cover layer may be partially present and in particular colored. It is preferred that the primer layer in this case is present over the entire surface and in particular is transparent.
- the soil-repellent coating is bilayered, with primarily the top layer, i. the cover layer, which protects the substrate from physical and chemical influences, while the lower layer (primer layer), i. the layer between the substrate and the cover layer, primarily makes contact with the substrate and, which is very important especially for very porous substrates whose pores closes.
- the primer layer serves as an adhesion promoter between the substrate (which optionally has a color layer and / or film elements) and a layer arranged above the primer layer.
- the primer layer has a barrier to liquids.
- the invention is based on the recognition that the contamination resistance of a value document can be substantially improved by a protective combination coating which comprises two special crosslinked layers.
- the crosslinking of the two layers at their common interface causes a high adhesion between the layers and thus a high abrasion resistance of the coating.
- both surfaces of the planar substrate are provided with such a coating, wherein the coatings on the two surfaces may be the same or different.
- Cover advantageously The coatings, the surfaces also in each case over the entire surface, wherein it is of course also possible in principle to coat the substrates on only one surface and / or only part of the surface.
- a radiation-curing lacquer in particular a UV-crosslinking lacquer, is used for the upper coating layer or covering layer.
- Radiation-curing paints and in particular UV-crosslinking paints are characterized by high physical and chemical resistance and are very abrasion-resistant.
- radiation-curing lacquers, in particular UV lacquers also offer a multitude of options for specifically influencing the feel of a security paper. The adjustment of the parameters brittleness, gloss and smoothness of the top layer allows in a variety of ways to directly influence the haptic properties of the coated paper, in particular its smoothness and sound.
- radiation-curing lacquers can also be used in particular for porous security papers if the porosity-causing depressions, unevennesses and pores of such substrates are at least partly or even completely closed before the application of the radiation-curing lacquer layer, in particular by a lower coating layer, namely the primer layer.
- the lower coating layer or primer layer is formed on the basis of a hybrid system.
- hybrid systems is understood in this document to include coatings which contain both physically drying constituents and radiation-curing constituents. "Physically drying” means that the drying takes place by evaporation and / or displacement of the solvent or dispersion medium into the substrate. Particularly preferred are water-based dispersion paints.
- suitable primer compositions are compositions based on acrylates, polyester acrylates, urethane acrylates, polyester polyurethanes, polyether polyurethanes and acrylic styrene polyurethanes.
- a hybrid paint When drying a hybrid paint is only physically, for example by heat, preferably by infrared radiation and / or hot air, the solvent or the dispersion medium, for example water, removed and then cured by radiation of a suitable wavelength of the radiation-curing paint portion.
- aqueous dispersions which contain acrylates and reactive monomers and / or reactive oligomers, in particular acrylates and photoinitiators.
- the aqueous primer layer may optionally contain crosslinking agent, e.g. Aziridine, included.
- Suitable compositions for the lower coating layer are explained in more detail below with reference to two example formulations. Both are water-based coatings with UV-reactive components.
- the crosslinker is added just prior to processing the coating composition.
- the ingredients may vary in their proportions. This applies in particular to the binder and the water content.
- the upper coating layer i. the outer layer is preferably formed from (in particular anhydrous) coating systems which crosslink by irradiation with ultraviolet light (UV light).
- UV light ultraviolet light
- Radical crosslinking UV lacquers are preferably suitable.
- Free-radically crosslinking compositions are based, for example, on acrylic acid esters. It will be understood that suitable photoinitiators must be included in each case and that the compositions may contain the usual adjuvants known to those skilled in the art.
- the cover layer additionally comprises silicone resins and / or waxes for improving the dirt-repellent properties.
- a suitable composition for the upper coating layer (covering layer) is explained in more detail below with reference to an example recipe. It is a radically curing UV varnish.
- the degree of gloss and the elasticity of the components may vary in their proportions and quality.
- the cover layer can also be formed by a hybrid system, wherein in principle similar hybrid systems are used, which were mentioned above for the primer layer. While the proportion of physically drying constituents should predominate for the primer layer, the proportion of radiation-curing constituents should predominate in the hybrid systems for the cover layer. Particularly preferred for the production of the cover layer is a preparation of reactive synthetic resins, which contains substantially different acrylates.
- all coating compositions may contain the usual auxiliaries.
- auxiliaries are, for example, coalescing agents, leveling agents, wetting agents, defoaming agents, viscosity modifiers, dispersing aids and diluents.
- visually unrecognizable feature substances such as for example luminescent substances, can be contained in the compositions.
- the coating composition suitable for producing the primer layer is first physically dried (without crosslinking of the radiation-curing constituents contained therein) before the coating composition suitable for producing the cover layer is applied.
- a hot air blower and / or an infrared radiator can be provided.
- the printing layer in particular having characters and / or patterns, can be applied to a dye-receiving layer, with the ink-accepting layer being above the substrate and below the lower layer (primer layer).
- Providing a dye-accepting layer is particularly expedient when the substrate is a plastic substrate.
- the primer layer (in particular the physically dried, radiation-curing primer layer) may be provided in part with a further print layer having characters and / or patterns, in particular a UV-crosslinking print layer, prior to the application of the cover layer.
- a UV-crosslinking print layer For example, a UV-drying code (eg the serial number of a value document) is suitable.
- the radiation-curing composition suitable for the production of the cover layer is applied.
- the primer layer, the UV-crosslinking print layer and the cover layer are then dried or crosslinked by means of UV radiation. All three layers are crosslinked with each other (in the sense of crosslinking at the interface between two different layers), so that an excellent adhesion is achieved with each other.
- the said further printing layer which has characters and / or patterns, in particular a UV-crosslinking printing layer, can be applied only after the application of the physically dried, radiation-curing primer layer and after application of those suitable for the production of the cover layer radiation-curing composition as the top layer to be applied to the substrate.
- the primer layer, the cover layer and the UV-crosslinking printing layer are then dried or crosslinked by means of UV radiation. All three layers are crosslinked with each other (in the sense of crosslinking at the interface between two different layers), so that an excellent adhesion is achieved with each other.
- This variant is particularly suitable for equipping value documents with a consecutive number sequence.
- the uppermost printing layer can be applied only in a second process step and dried or crosslinked separately.
- the soil-repellent coating is preferably transparent and colorless, especially if a printed substrate remain as visible as possible should.
- the primer layer and / or the cover layer can be provided with a color tint, with a matting or with other functions.
- the coating compositions for the primer layer and for the cover layer in a layer thickness or thickness in a range of 1.0 to 4.0 microns per single coating on the substrate.
- the preferred wet film layer thickness for the primer layer is in a range of 1.3 to 4.0 ⁇ m.
- the layer thickness should be adapted to the respective substrate quality (namely the roughness of the respective substrate side).
- the layer thickness should be sufficient to at least substantially close the irregular depressions and pores in the case of porous substrates.
- the preferred wet film layer thickness for the cover layer is in a range of 1.5 to 3.0 ⁇ m.
- the coating compositions for the primer layer and for the topcoat may each be applied to the substrate by the flexographic printing process.
- the coating thickness is controlled, inter alia, via the theoretical scoop volume of the raster or anilox roll.
- the transfer behavior ie the amount of lacquer transferred, is furthermore dependent on the surface tension of the lacquer, the capillary forces of the substrate, the surface tension of the printing plate or the blanket and the rheological properties (eg viscosity, elasticity) of the lacquers during application.
- Suitable coating compositions for the preparation of the primer layer which are water-based and include UV-reactive components, preferably have a viscosity of 25 to 150 seconds (more preferably 40 to 90 seconds) measured with DIN 4 cup cups at 20 ° C.
- Suitable coating compositions for the preparation of the cover layer which are UV-drying, preferably have a viscosity of 30 to 150 seconds, measured with DIN 4 cup cup at 20 ° C.
- the value-document substrate does not necessarily have the entire surface, but can also be partially (ie partially) provided on one or both surfaces with the dirt-repellent, two-layer coating. This procedure is particularly suitable if the document of value has certain, optically variable counterfeit protection means which should not be provided with such a dirt-repellent coating as a result of a possible impairment of the optical effect.
- Such anti-counterfeiting means include, among other things, security elements with a microoptical representation arrangement with microstructures and microimage elements for enlarged reproduction of the microstructures, for example microlens or micro hollow mirror arrays. Security features based on micro-optical representations are eg off EP 0 238 043 A2 . DE 36 09 090 A1 .
- the optically variable anti-counterfeiting device can be in the form of a security strip, a security thread or in the form of a label or patch, for example, and can be visually recognizable to the viewer completely or only in regions.
- An example of an only partially visually recognizable tamper-evident means is a window security thread (eg a microlens thread), which emerges in window areas on the surface of a banknote, while in the intervening web areas is embedded in the interior of the banknote (see for example the Fig. 1 of the WO 2004/097112 A1 ).
- the document of value only with the dirt-repellent, two-layer coating on which no optically variable anti-counterfeiting agent is arranged, and to provide the optically variable anti-counterfeiting agent with a thin, special high-gloss lacquer which enhances the optical effect of the anti-fouling agent Anti-counterfeiting, especially the light / dark contrast, the sharpness and the magnification and movement effect, not recognizable deteriorated.
- the special high-gloss lacquer for example, a radiation-curing lacquer which is highly cross-linked after crosslinking in a small layer thickness of 0.7 to 2 ⁇ m, preferably 0.7 to 1.5 ⁇ m, is suitable.
- Such a varnish can be obtained from a UV-crosslinking varnish which contains no dulling agents and, as a result of its varnish composition, has only a very slight scattering after drying and thus only a very slight dulling.
- the high-gloss lacquer can in particular be based on mixtures of mono- and / or difunctional monomeric acrylates, prepolymeric acrylates, and tri- and / or tetrafunctional monomeric acrylates.
- prepolymeric acrylates for example, polyester acrylates, urethane acrylates, acrylic acrylates and / or methacrylacrylates, oligoester acrylates, epoxy acrylates, and / or mixtures of two or more of these prepolymeric acrylates can be used.
- An example of the composition of a high gloss paint is listed below:
- the high gloss lacquer can be applied as a spot coating in the flexo, offset or high pressure process. It is preferred to adjust the viscosity of the high-gloss lacquer in a range of 30 to 150 sec, in particular 30 to 80 sec, flow time according to DIN 4 CUP cup at 20 ° C.
- Banknote papers are typically made from fibers of annual plants, especially cotton fibers or pulp fibers. It is also possible to use papers which partly comprise synthetic fibers, preferably polyamide fibers or polyester fibers.
- a valuable document substrate is also a polymer substrate (or plastic substrate), which has a suitable ink receiving layer. More preferably, a cotton paper is used as the substrate.
- the basis weight of the substrate varies depending on the application form. Typical basis weights are in the range of 50 g / m 2 to 100 g / m 2 , preferably in the range of 60 g / m 2 to 90 g / m 2 , more preferably about 70 g / m 2 .
- the individual paper layers may consist of the same or different types of paper.
- a paper layer may be a pure cotton paper, while another paper layer may comprise plastic fibers.
- multi-ply paper / film composites such as a paper / film / paper composite or a film / paper / film composite can also be used as the substrate.
- the production preferably takes place by means of a rotary screening machine.
- Fig. 1a shows a document of value substrate 1 (in the example paper, preferably cotton paper) with a pressure applied to a substrate surface 2 in the form of characters and / or patterns.
- the substrate 1 provided with a printing layer 2 is first subjected to the water-based coating composition described above in "Example A" 3, which is suitable for the production of a primer layer, applied in flexographic printing process (see Fig. 1b ).
- Fig. 1c shows the layer structure of Fig. 1b after physical drying by hot air.
- the water content of the water-based coating composition 3 evaporates and is partially absorbed by the porous substrate 1, so that the film thickness of the physically dried radiation-curing primer layer 4 is significantly reduced.
- the UV-drying topcoat 5 described above in “Example C” is applied (see Fig. 1d ).
- Fig. 1e shows the layer structure of Fig. 1d after a UV-drying. Since the UV-drying topcoat 5 is a so-called "100% system" (ie, 100% solids content), only a very small reduction in the layer thickness occurs during UV crosslinking. The UV-reactive components of the physically dried, radiation-curing primer layer 4 are crosslinked simultaneously with the UV-drying topcoat 5, so that a radiation-cured primer layer 41 and a radiation-cured cover layer 51 are formed, which are crosslinked at their common interface via radiation-cured groups.
- Fig. 2 shows a schematic representation of a value document 6 (in the present case, a banknote), which is provided with an embedded window security thread 7 and a glued patch-shaped security element 8.
- the value document 6 also has the denomination "100" in the form of a watermark.
- the window security thread 7 in the present case a microlens thread
- the security element 8 im
- a micro-optical representation arrangement with microstructures and micro-cavity mirror arrays for enlarged imaging of the microstructures give the viewer a different image impression at different viewing angles.
- the windowed security thread 7 shown in dashed lines emerges at the window areas 9 on the surface of the value document 6, while it is embedded in the interior of the value document 6 at the intervening web areas.
- the patch-shaped security element 8 and the window security thread 7 are each provided with a visibility of the optically variable effect substantially not influencing, pollution-resistant high gloss paint.
- the high-gloss lacquer is a UV lacquer based on the "Example D" composition described above and is applied to the value document by flexographic printing or offset printing in areas 10 and II.
- the high-gloss lacquer is not applied in register over the counterfeit protection means 7 and 8, but the lacquer also covers adjacent parts of the value document surrounding the counterfeit security means 7 and 8 and so to say edge regions for the tamper-evident 7 and 8 form.
- the layer thickness of the high-gloss lacquer in the present example is 1.5 ⁇ m.
- the value document 6 is partially provided outside of the anti-counterfeiting means 7 and 8 surrounding areas II and 10 with the dirt-repellent, two-layer coating 11.
- the coating 11 consists of the in Fig. 1e layers 41 and 51 shown.
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Abstract
Description
Die Erfindung betrifft ein Wertdokument, wie etwa eine Banknote, ein Ausweisdokument oder eine Urkunden, mit einem flächigen Substrat, das zumindest teilweise mit einer schmutzabweisenden Beschichtung versehen ist, um die Lebensdauer und Umlauffähigkeit zu verlängern. Die Erfindung betrifft des Weiteren ein Verfahren zum Herstellen eines solchen Wertdokuments.The invention relates to a document of value, such as a banknote, a document of identification or a document, with a flat substrate, which is at least partially provided with a dirt-repellent coating in order to extend the service life and fitness for circulation. The invention further relates to a method for producing such a value document.
Banknoten und andere Wertdokumente werden üblicherweise aus sogenannten Sicherheitspapieren gefertigt, die Sicherheitselemente bzw. Sicherheitsmerkmale, wie einen teilweise in das Papier eingebrachten Sicherheitsfaden, einen Folienpatch mit Beugungsstrukturen oder Brechungsstrukturen, Farbkippeffekten oder mikrooptischen Darstellungsanordnungen, oder Wasserzeichen aufweisen. Außerdem sind die Wertdokumente typischerweise bedruckt, wobei oft aufwendige Druckbilder mit technisch anspruchsvollen Druckverfahren, beispielsweise Stichtiefdruck, erzeugt werden. Ferner zeichnen sich Wertdokumente, wie beispielsweise Banknoten, auch noch durch einen teils durch das Papiersubstrat, teils durch dessen Behandlung (wie einseitige oder zweiseitige Kalandrierung bei dem Stahlstichtiefdruck) bedingten Charakter aus, nämlich ihre Griffigkeit und ihre Biegesteifigkeit und den beim Verformen und Knittern charakteristischen Klang.Banknotes and other value documents are usually made of so-called security papers which have security elements or security features, such as a security thread partially introduced into the paper, a foil patch with diffraction structures or refractive structures, color shift effects or microoptical representation arrangements, or watermarks. In addition, the value documents are typically printed, often consuming print images are produced with technically demanding printing processes, such as intaglio. Furthermore, documents of value, such as banknotes, are also characterized by a character caused partly by the paper substrate, partly by its treatment (such as one-sided or two-sided calendering in the case of steel intaglio printing), namely its grip and bending stiffness and the sound which is characteristic during deformation and wrinkling ,
Während ihres Umlaufs werden Wertdokumente, wie Banknoten, starken Belastungen unterschiedlicher Art ausgesetzt, die ihre Umlaufdauer begrenzen. Die Umlaufdauer einer Banknote hängt wesentlich von ihrer Beanspruchung ab. Bestimmte Stückelungen werden im Handel bevorzugt benutzt und weisen damit aufgrund der stärkeren Belastung durch Umwelteinflüsse eine geringere Umlaufdauer auf. Eine Ursache für die Einschränkung der Umlaufdauer sind mechanische Beanspruchungen durch Abrieb, Falten oder Knittern. Als Hauptursache für die eingeschränkte Umlaufzeit von Banknoten gilt deren frühzeitige Verschmutzung. Da das für Banknoten bevorzugt verwendete Papier sehr porös ist, besitzt es eine große Oberfläche sowie eine hohe Oberflächenrauigkeit. Die Oberflächenrauigkeit begünstigt im Vergleich zu einer glatten Oberfläche Schmutzablagerungen im erheblichen Maße. Schmutz kann flüssig oder fest sein, und flüssiger Schmutz wiederum kann hydrophob oder hydrophil sein.During their circulation, value documents, such as banknotes, are exposed to heavy burdens of various kinds, which limit their orbital period. The circulation period of a banknote depends essentially on its demand. Certain denominations are preferably used in commerce and thus have a shorter circulation time due to the greater exposure to environmental influences. A cause for the restriction of Orbital period are mechanical stresses due to abrasion, folding or creasing. The main cause of the limited circulation time of banknotes is their premature pollution. Since the paper used for banknotes is very porous, it has a large surface area and a high surface roughness. The surface roughness favors dirt deposits considerably compared to a smooth surface. Dirt can be liquid or solid, and liquid dirt in turn can be hydrophobic or hydrophilic.
Es besteht das Bedürfnis, Wertdokumente, und insbesondere die stark beanspruchten Banknoten, gegen Verschmutzungen und Kontaminierungen jeglicher Art zu schützen, um dadurch die Umlaufdauer zu erhöhen.There is a need to protect value documents, and in particular the heavily used banknotes, against soiling and contamination of any kind, thereby increasing the circulation time.
Es wurden zahlreiche Versuche unternommen, die Umlaufdauer von Banknoten zu verlängern. Beispielsweise wurde vorgeschlagen, Banknoten vollständig aus einem Kunststoffsubstrat zu fertigen (siehe z.B. die
Aufgabe der vorliegenden Erfindung ist es daher, ein Wertdokument anzugeben, das die Nachteile des Standes der Technik vermeidet. Insbesondere soll das Wertdokument bevorzugt folgende Eigenschaften aufweisen:The object of the present invention is therefore to provide a document of value which avoids the disadvantages of the prior art. In particular, the value document should preferably have the following properties:
Es soll über einen möglichst langen Zeitraum gegen feste und flüssige Verunreinigungen geschützt sein.It should be protected against solid and liquid contaminants for as long as possible.
Es soll gewohnte wertdokumenttypische Eigenschaften, beispielsweise den typischen Griff und Klang einer Banknote, aufweisen.It should have the usual value-typical properties, such as the typical feel and sound of a banknote.
Es soll die Ausstattung mit beliebigen Sicherheitsmerkmalen, beispielsweise taktilen Sicherheitsmerkmalen oder Wasserzeichen, zulassen.It should allow the equipment with any security features, such as tactile security features or watermarks.
Aufgabe der vorliegenden Erfindung ist es auch, ein Verfahren zur Herstellung eines derartigen Wertdokuments bereitzustellen.It is also an object of the present invention to provide a method for producing such a value document.
Die Aufgaben werden durch das Wertdokument und das Verfahren zu dessen Herstellung mit den Merkmalen, wie sie in den jeweiligen unabhängigen Ansprüchen angegeben sind, gelöst. Bevorzugte Ausgestaltungen der Erfindung sind Gegenstand der abhängigen Ansprüche.The objects are achieved by the value document and the method for its production having the features as stated in the respective independent claims. Preferred embodiments of the invention are the subject of the dependent claims.
Ein erster Aspekt der Erfindung betrifft ein Verfahren zum Herstellen eines Wertdokuments, wie etwa eine Banknote, mit einem flächigen Substrat, das zumindest teilweise mit einer eine Primerschicht und eine Deckschicht aufweisenden, schmutzabweisenden Beschichtung versehen ist, wobei das Verfahren die folgenden Schritte enthält:
- a) Bereitstellen eines flächigen Substrats mit einer ersten Substratoberfläche und einer zweiten Substratoberfläche;
- b) Bedrucken zumindest einer Substratoberfläche mit Zeichen und/oder Mustern;
- c) Aufbringen einer ersten Beschichtungszusammensetzung, die zur Erzeugung der Primerschicht geeignet ist, auf die bedruckte Substratoberfläche, wobei die erste Beschichtungszusammensetzung auf einem Hybridlack, der sowohl physikalisch trocknende Bestandteile als auch strahlungshärtende Bestandteile enthält, basiert;
- d) physikalisches Trocknen der ersten Beschichtungszusammensetzung und Ausbilden einer physikalisch getrockneten, strahlungshärtenden Primerschicht;
- e) Aufbringen einer zweiten Beschichtungszusammensetzung, die zur Erzeugung der Deckschicht geeignet ist, auf die physikalisch getrocknete, strahlungshärtende Primerschicht, wobei die zweite Beschichtungszusammensetzung auf einer strahlungshärtenden Zusammensetzung basiert;
- f) Strahlungshärten der physikalisch getrockneten, strahlungshärtenden Primerschicht und der auf einer strahlungshärtenden Zusammensetzung basierenden zweiten Beschichtungszusammensetzung, so dass eine strahlungsgehärtete Primerschicht und eine strahlungsgehärtete Deckschicht ausgebildet werden und die beiden Schichten an ihrer gemeinsamen Grenzfläche über strahlungsgehärtete Gruppen miteinander vernetzt sind.
- a) providing a planar substrate having a first substrate surface and a second substrate surface;
- b) printing at least one substrate surface with characters and / or patterns;
- c) applying a first coating composition which is suitable for producing the primer layer to the printed substrate surface, wherein the first coating composition is applied to a hybrid paint, which contains both physically drying ingredients and radiation curing ingredients;
- d) physically drying the first coating composition and forming a physically dried, radiation curable primer layer;
- e) applying to the physically dried radiation curable primer layer a second coating composition suitable for forming the cover layer, the second coating composition being based on a radiation curable composition;
- f) radiation-curing the physically-dried, radiation-curable primer layer and the radiation-curable composition-based second coating composition to form a radiation-cured primer layer and a radiation-cured topcoat and cross-linking the two layers at their common interface via radiation-cured groups.
Der Schritt des Strahlungshärtens erfolgt insbesondere mittels UV-Trocknung. Das Strahlungshärten der physikalisch getrockneten, strahlungshärtenden Primerschicht und der auf einer strahlungshärtenden Zusammensetzung basierenden zweiten Beschichtungszusammensetzung erfolgt insbesondere zeitgleich, um eine ausgesprochen hohe physikalische und chemische Beständigkeit des Schichtaufbaus zu erreichen.The radiation curing step takes place in particular by means of UV drying. The radiation curing of the physically dried, radiation-curing primer layer and the radiation-curing composition-based second coating composition takes place in particular at the same time in order to achieve a very high physical and chemical resistance of the layer structure.
Es wird bevorzugt, dass der Hybridlack der zur Erzeugung der Primerschicht geeigneten, ersten Beschichtungszusammensetzung Acrylate und/oder Polyesteracrylate und/oder Urethanacrylate und/oder Polyesterpolyurethane und/oder Polyetherpolyurethane und/oder Acryl-Styrol-Polyurethane aufweist.It is preferred that the hybrid paint of the first coating composition suitable for forming the primer layer comprises acrylates and / or polyester acrylates and / or urethane acrylates and / or polyester polyurethanes and / or polyether polyurethanes and / or acrylic-styrene polyurethanes.
Es wird weiter bevorzugt, dass der Hybridlack der zur Erzeugung der Primerschicht geeigneten, ersten Beschichtungszusammensetzung auf einer wässrigen Dispersion, die Acrylate und reaktive Monomere und/oder reaktive Oligomere, insbesondere Acrylate und Photoinitiatoren, aufweist, beruht.It is further preferred that the hybrid lacquer of the first coating composition suitable for forming the primer layer is based on an aqueous dispersion comprising acrylates and reactive monomers and / or reactive oligomers, in particular acrylates and photoinitiators.
Es wird bevorzugt, dass die strahlungshärtende Zusammensetzung der zur Erzeugung der Deckschicht geeigneten, zweiten Beschichtungszusammensetzung ein radikalisch vernetzender UV-Lack oder ein kationisch vernetzender UV-Lack ist.It is preferred that the radiation-curable composition of the second coating composition suitable for forming the cover layer is a free-radically crosslinking UV varnish or a cationically crosslinking UV varnish.
Gemäß einer bevorzugten Ausgestaltung kann die physikalisch getrocknete, strahlungshärtende Primerschicht vor dem Aufbringen der zur Erzeugung der zweiten Deckschicht geeigneten, zweiten Beschichtungszusammensetzung zum Teil mit einer zusätzlichen UV-vernetzenden Druckschicht, die Zeichen und/oder Muster aufweist, versehen werden.According to a preferred embodiment, the physically dried, radiation-curable primer layer may be provided, in part, with an additional UV-crosslinking print layer having indicia and / or patterns prior to applying the second coating composition suitable for forming the second cover layer.
Alternativ oder zusätzlich zu der vorstehend erwähnten bevorzugten Ausgestaltung kann die auf das Substrat aufgebrachte, zur Erzeugung der Deckschicht geeignete, zweite Beschichtungszusammensetzung vor dem Schritt des Strahlungshärtens zum Teil mit einer zusätzlichen UV-vernetzenden Druckschicht, die Zeichen und/oder Muster aufweist, versehen werden.Alternatively, or in addition to the preferred embodiment mentioned above, the second coating composition applied to the substrate to form the cover layer may be partially provided with an additional UV-crosslinking print layer having indicia and / or patterns prior to the radiation curing step.
Alternativ oder zusätzlich zu den beiden vorstehend erwähnten bevorzugten Ausgestaltungen kann die Deckschicht nach dem Schritt des Strahlungshärtens mit einer zusätzlichen, insbesondere UV-vernetzenden oder oxidativ trocknenden, Druckschicht, die Zeichen und/oder Muster aufweist, versehen werden.As an alternative or in addition to the two preferred embodiments mentioned above, after the radiation-curing step, the cover layer may be provided with an additional, in particular UV-curing or oxidatively drying, print layer which has characters and / or patterns.
Das erfindungsgemäße Verfahren kann gemäß einer weiteren bevorzugten Ausgestaltung so durchgeführt werden, dass
das erhaltene flächige Substrat ein optisch variables Fälschungssicherungsmittel aufweist, das an seiner Oberfläche zur Erhöhung der Verschmutzungsbeständigkeit mit einem Hochglanzlack versehen ist, wobei der Hochglanzlack eine Schichtdicke in einem Bereich von 0,7 bis 1,5 µm aufweist, und
das flächige Substrat an seiner außerhalb des optisch variablen Fälschungssicherungsmittels liegenden Oberfläche zumindest teilweise mit der eine Primerschicht und eine Deckschicht aufweisenden, schmutzabweisenden Beschichtung versehen ist.The inventive method can be performed according to a further preferred embodiment so that
the flat substrate obtained has an optically variable anti-counterfeiting agent, which is provided on its surface for increasing the fouling resistance with a high-gloss paint, wherein the high-gloss paint has a layer thickness in a range of 0.7 to 1.5 microns, and
the planar substrate is at least partially provided on its surface located outside the optically variable counterfeit securing means with the dirt-repellent coating having a primer layer and a cover layer.
Ein zweiter Aspekt der Erfindung betrifft ein Wertdokument, wie etwa eine Banknote, das durch das Verfahren gemäß dem ersten Aspekt der Erfindung erhältlich ist.A second aspect of the invention relates to a value document, such as a banknote, obtainable by the method according to the first aspect of the invention.
Unter einem Primer bzw. einer Primerschicht ist laut
Die Deckschicht kann insbesondere ein UV-Lack bzw. UV-Decklack oder eine UV-trocknende Farbe sein. Mit anderen Worten, die Deckschicht kann transparent oder farbig sein, d.h. Farbbestandteile enthalten, die insbesondere von der Gruppe bestehend aus Interferenzpigmenten, Flüssigkristallpigmenten, Lumineszenzstoffen, IR-absorbierenden Stoffen, organischen und/oder anorganischen Buntpigmenten bzw. Farbstoffen gewählt sind. Die Deckschicht kann vollflächig vorliegen oder partiell, d.h. bereichsweise bzw. in Form mehrerer einzelner Bereiche, vorliegen. Darüber hinaus ist es möglich, dass die Deckschicht sowohl transparente als auch farbige Bereiche aufweist.The cover layer may in particular be a UV lacquer or UV top lacquer or a UV-drying ink. In other words, the cover layer may be transparent or colored, i. Contain color components which are selected in particular from the group consisting of interference pigments, liquid crystal pigments, luminescent substances, IR-absorbing substances, organic and / or inorganic colored pigments or dyes. The cover layer can be present all over or partially, i. in regions or in the form of several individual areas. In addition, it is possible that the cover layer has both transparent and colored areas.
Darüber hinaus kann die Deckschicht Antistatika enthalten. Auf diese Weise kann z.B. die Anziehung von Staub sowie die Haftung von hygienisch bedenklichen Verunreinigungen vermieden werden. Geeignete Antistatikaformulierungen für Farben und Lacke sind im Stand der Technik bekannt, siehe z.B. die
Die Ausstattung der Deckschicht mit Antistatika ist vorteilhaft, um das durch elektrostatische Aufladung verursachte Zusammenhaften bzw. Verblocken von Druckerzeugnissen wie etwa Banknoten zu vermeiden.The provision of antistatics to the cover layer is advantageous in order to avoid the sticking or blocking of printed products, such as banknotes, caused by electrostatic charging.
In einer besonderen Variante kann die Primerschicht partiell vorliegen und insbesondere farbig sein. Es wird bevorzugt, dass die Deckschicht in diesem Fall vollflächig vorliegt und insbesondere transparent ist.In a particular variant, the primer layer can be present in part and in particular be colored. It is preferred that the cover layer in this case is present over the entire surface and in particular is transparent.
Gemäß einer alternativen Variante kann die Deckschicht partiell vorliegen und insbesondere farbig sein. Es wird bevorzugt, dass die Primerschicht in diesem Fall vollflächig vorliegt und insbesondere transparent ist.According to an alternative variant, the cover layer may be partially present and in particular colored. It is preferred that the primer layer in this case is present over the entire surface and in particular is transparent.
Die schmutzabweisende Beschichtung ist zweischichtig ausgebildet, wobei es in erster Linie die obere Schicht, d.h. die Deckschicht, ist, die das Substrat vor physikalischen und chemischen Einflüssen schützt, während die untere Schicht (Primerschicht), d.h. die Schicht zwischen dem Substrat und der Deckschicht, in erster Linie den Kontakt zu dem Substrat herstellt und, was insbesondere bei sehr porösen Substraten sehr wichtig ist, dessen Poren schließt. Die Primerschicht dient als Haftvermittler zwischen dem Substrat (das gegebenenfalls eine Farbschicht und/oder Folienelemente aufweist) und einer oberhalb der Primerschicht angeordneten Schicht. Darüber hinaus hat die Primerschicht eine Barrierewirkung gegenüber Flüssigkeiten.The soil-repellent coating is bilayered, with primarily the top layer, i. the cover layer, which protects the substrate from physical and chemical influences, while the lower layer (primer layer), i. the layer between the substrate and the cover layer, primarily makes contact with the substrate and, which is very important especially for very porous substrates whose pores closes. The primer layer serves as an adhesion promoter between the substrate (which optionally has a color layer and / or film elements) and a layer arranged above the primer layer. In addition, the primer layer has a barrier to liquids.
Der Erfindung liegt die Erkenntnis zugrunde, dass die Verschmutzungsbeständigkeit eines Wertdokuments durch eine schützende Kombinationsbeschichtung, die zwei spezielle, miteinander vernetzte Schichten umfasst, wesentlich verbessert werden kann. Die Vernetzung der beiden Schichten an ihrer gemeinsamen Grenzfläche bewirkt eine hohe Haftung zwischen den Schichten und damit eine hohe Abriebbeständigkeit der Beschichtung.The invention is based on the recognition that the contamination resistance of a value document can be substantially improved by a protective combination coating which comprises two special crosslinked layers. The crosslinking of the two layers at their common interface causes a high adhesion between the layers and thus a high abrasion resistance of the coating.
Vorteilhafterweise sind beide Oberflächen des flächigen Substrats mit einer derartigen Beschichtung versehen, wobei die Beschichtungen an den beiden Oberflächen gleich oder verschieden sein können. Vorteilhafterweise bedecken die Beschichtungen die Oberflächen auch jeweils vollflächig, wobei es natürlich grundsätzlich auch möglich ist, die Substrate an nur einer Oberfläche und/oder nur teilflächig zu beschichten.Advantageously, both surfaces of the planar substrate are provided with such a coating, wherein the coatings on the two surfaces may be the same or different. Cover advantageously The coatings, the surfaces also in each case over the entire surface, wherein it is of course also possible in principle to coat the substrates on only one surface and / or only part of the surface.
Beispielsweise ist es möglich, die schmutzabweisende, zweilagige Beschichtung aus Gründen der Kostenreduzierung nur auf einer Substratseite bzw. Substratoberfläche vorzusehen, und die andere Substratseite mit einem wasserbasierenden Lack oder einem UV-Lack (der insbesondere radikalisch oder kationisch härtend ist) auszustatten.For example, it is possible to provide the dirt-repellent, two-layer coating only on one substrate side or substrate surface for cost-saving reasons, and to equip the other substrate side with a water-based lacquer or a UV lacquer (which is in particular free-radically or cationically curing).
Für die obere Beschichtungsschicht bzw. Deckschicht wird ein strahlungshärtender Lack, insbesondere ein UV-vernetzender Lack, verwendet. Strahlungshärtende Lacke und insbesondere UV-vernetzende Lacke zeichnen sich durch eine hohe physikalische und chemische Beständigkeit aus und sind sehr scheuerfest. Neben den guten, die Lebensdauer verlängernden Eigenschaften bieten strahlungshärtende Lacke, insbesondere UV-Lacke, auch eine Vielzahl von Möglichkeiten, die Haptik eines Sicherheitspapiers gezielt zu beeinflussen. Die Einstellung der Parameter Sprödigkeit, Glanz und Glätte der Deckschicht erlaubt auf eine vielfältige Weise, direkten Einfluss auf die haptischen Eigenschaften des beschichteten Papiers, insbesondere auf dessen Glätte und Klang, zu nehmen.A radiation-curing lacquer, in particular a UV-crosslinking lacquer, is used for the upper coating layer or covering layer. Radiation-curing paints and in particular UV-crosslinking paints are characterized by high physical and chemical resistance and are very abrasion-resistant. In addition to the good life-prolonging properties, radiation-curing lacquers, in particular UV lacquers, also offer a multitude of options for specifically influencing the feel of a security paper. The adjustment of the parameters brittleness, gloss and smoothness of the top layer allows in a variety of ways to directly influence the haptic properties of the coated paper, in particular its smoothness and sound.
Die vorteilhaften Eigenschaften strahlungshärtender Lacke können insbesondere auch für poröse Sicherheitspapiere genutzt werden, wenn die die Porösität verursachenden Vertiefungen, Unebenheiten und Poren solcher Substrate vor der Auftragung der strahlungshärtenden Lackschicht insbesondere durch eine untere Beschichtungsschicht, nämlich die Primerschicht, zumindest teilweise oder sogar vollständig geschlossen werden.The advantageous properties of radiation-curing lacquers can also be used in particular for porous security papers if the porosity-causing depressions, unevennesses and pores of such substrates are at least partly or even completely closed before the application of the radiation-curing lacquer layer, in particular by a lower coating layer, namely the primer layer.
Die untere Beschichtungsschicht bzw. Primerschicht wird auf der Basis eines Hybridsystems gebildet. Unter dem Begriff Hybridsysteme werden in dieser Schrift Lacke verstanden, die sowohl physikalisch trocknende Bestandteile als auch strahlungshärtende Bestandteile enthalten. "Physikalisch trocknend" bedeutet, dass die Trocknung durch Verdunsten und/oder Wegschlagen der Lösungsmittel bzw. Dispersionsmittel in das Substrat erfolgt. Besonders bevorzugt sind Dispersionslacke auf Wasserbasis. Beispiele für geeignete Primer-Zusammensetzungen sind Zusammensetzungen auf der Basis von Acrylaten, Polyesteracrylaten, Urethanacrylaten, Polyesterpolyurethanen, Polyetherpolyurethanen und Acryl-Styrol-Polyurethanen.The lower coating layer or primer layer is formed on the basis of a hybrid system. The term hybrid systems is understood in this document to include coatings which contain both physically drying constituents and radiation-curing constituents. "Physically drying" means that the drying takes place by evaporation and / or displacement of the solvent or dispersion medium into the substrate. Particularly preferred are water-based dispersion paints. Examples of suitable primer compositions are compositions based on acrylates, polyester acrylates, urethane acrylates, polyester polyurethanes, polyether polyurethanes and acrylic styrene polyurethanes.
Bei der Trocknung eines Hybridlacks wird erst physikalisch, beispielsweise durch Wärme, bevorzugt durch Infrarotstrahlung und/oder Heißluft, das Lösungsmittel oder das Dispersionsmittel, beispielsweise Wasser, entfernt und dann mittels Strahlung einer geeigneten Wellenlänge der strahlungshärtende Lackanteil ausgehärtet. Als Hybridlack eignen sich insbesondere wässrige Dispersionen, die Acrylate und reaktive Monomere und/oder reaktive Oligomere, insbesondere Acrylate und Photoinitiatoren, aufweisen. Die wässrige Primerschicht kann gegebenenfalls Vernetzungsmittel, z.B. Aziridin, enthalten.When drying a hybrid paint is only physically, for example by heat, preferably by infrared radiation and / or hot air, the solvent or the dispersion medium, for example water, removed and then cured by radiation of a suitable wavelength of the radiation-curing paint portion. Particularly suitable as a hybrid paint are aqueous dispersions which contain acrylates and reactive monomers and / or reactive oligomers, in particular acrylates and photoinitiators. The aqueous primer layer may optionally contain crosslinking agent, e.g. Aziridine, included.
Geeignete Zusammensetzungen für die untere Beschichtungsschicht (Primerschicht) sind nachstehend anhand zweier Beispielrezepturen näher erläutert. Es handelt sich in beiden Fällen um wasserbasierte Lacke mit UV-reaktiven Komponenten. Im Beispiel B wird der Vernetzer unmittelbar vor der Verarbeitung der Beschichtungszusammensetzung hinzugefügt.Suitable compositions for the lower coating layer (primer layer) are explained in more detail below with reference to two example formulations. Both are water-based coatings with UV-reactive components. In Example B, the crosslinker is added just prior to processing the coating composition.
Je nach den gewünschten rheologischen Eigenschaften können die Bestandteile in ihren Mengenverhältnissen variieren. Dies gilt insbesondere für das Bindemittel und den Wasseranteil.Depending on the desired rheological properties, the ingredients may vary in their proportions. This applies in particular to the binder and the water content.
Die obere Beschichtungsschicht, d.h. die Deckschicht, wird bevorzugt aus (insbesondere wasserfreien) Lacksystemen gebildet, die durch Bestrahlung mit ultraviolettem Licht (UV-Licht) vernetzen. Bevorzugt kommen radikalisch vernetzende UV-Lacke infrage. Radikalisch vernetzende Zusammensetzungen basieren beispielsweise auf Acrylsäureestern. Es versteht sich, dass jeweils geeignete Photoinitatoren enthalten sein müssen, und dass die Zusammensetzungen die üblichen Hilfsmittel enthalten können, die einem Fachmann bekannt sind. Es wird bevorzugt, dass die Deckschicht zur Verbesserung der schmutzabweisenden Eigenschaften zusätzlich Silikonharze und/oder Wachse aufweist.The upper coating layer, i. the outer layer is preferably formed from (in particular anhydrous) coating systems which crosslink by irradiation with ultraviolet light (UV light). Radical crosslinking UV lacquers are preferably suitable. Free-radically crosslinking compositions are based, for example, on acrylic acid esters. It will be understood that suitable photoinitiators must be included in each case and that the compositions may contain the usual adjuvants known to those skilled in the art. It is preferred that the cover layer additionally comprises silicone resins and / or waxes for improving the dirt-repellent properties.
Eine geeignete Zusammensetzung für die obere Beschichtungsschicht (Deckschicht) wird nachstehend anhand einer Beispielrezeptur näher erläutert. Es handelt sich dabei um einen radikalisch härtenden UV-Lack.A suitable composition for the upper coating layer (covering layer) is explained in more detail below with reference to an example recipe. It is a radically curing UV varnish.
Je nach den gewünschten rheologischen Eigenschaften, den Glanzgrad und der Elastizität können die Bestandteile in ihren Mengenverhältnissen und der Qualität variieren.Depending on the desired rheological properties, the degree of gloss and the elasticity of the components may vary in their proportions and quality.
Alternativ kann die Deckschicht auch von einem Hybridsystem gebildet werden, wobei grundsätzlich ähnliche Hybridsysteme geeignet sind, die oben für die Primerschicht genannt wurden. Während für die Primerschicht der Anteil physikalisch trocknender Bestandteile überwiegen sollte, sollte in den Hybridsystemen für die Deckschicht der Anteil strahlungshärtender Bestandteile überwiegen. Besonders bevorzugt für die Herstellung der Deckschicht ist eine Präparation reaktiver Kunstharze, die im Wesentlichen verschiedene Acrylate enthält.Alternatively, the cover layer can also be formed by a hybrid system, wherein in principle similar hybrid systems are used, which were mentioned above for the primer layer. While the proportion of physically drying constituents should predominate for the primer layer, the proportion of radiation-curing constituents should predominate in the hybrid systems for the cover layer. Particularly preferred for the production of the cover layer is a preparation of reactive synthetic resins, which contains substantially different acrylates.
Es versteht sich, dass sämtliche Beschichtungszusammensetzungen, beispielsweise die Beschichtungszusammensetzungen für die obere Beschichtungsschicht (Deckschicht) und die untere Beschichtungsschicht (Primerschicht), die üblichen Hilfsstoffe enthalten können. Übliche Hilfsstoffe sind beispielsweise Koaleszenzmittel, Verlaufmittel, Benetzungsmittel, Entschäumungsmittel, Viskositäts-Modifizierungsmittel, Dispergier-Hilfsmittel und Verdünnungsmittel. Auch bevorzugt visuell nicht erkennbare Merkmalsstoffe, wie beispielsweise Lumineszenzstoffe, können in den Zusammensetzungen enthalten sein.It is understood that all coating compositions, for example, the coating compositions for the top coat layer (top coat) and the bottom coat coat (primer coat), may contain the usual auxiliaries. Common auxiliaries are, for example, coalescing agents, leveling agents, wetting agents, defoaming agents, viscosity modifiers, dispersing aids and diluents. Also preferably visually unrecognizable feature substances, such as for example luminescent substances, can be contained in the compositions.
Es ist zweckmäßig, das Substrat vor der Auftragung der schmutzabweisenden Beschichtung bereits mit Zeichen und/oder Mustern zu bedrucken. Aus Arbeitsschutzgründen und angesichts des einfachen Handlings ist es von Vorteil, die schmutzabweisende, zweilagige Beschichtung im Sinne einer Inline-Lackierung zu applizieren. Auf diese Weise können durch unvernetzte, UV-reaktive Gruppen verursachte Hautirritationen vermieden werden. Eine zeitlich zu große Verzögerung (insbesondere eine Zeitspanne von mehreren Stunden oder Tagen) zwischen dem Applizieren der zur Erzeugung der Primerschicht geeigneten ersten Beschichtungszusammensetzung und dem Applizieren der zur Erzeugung der Deckschicht geeigneten zweiten Beschichtungszusammensetzung könnte zum Vorvernetzen der UV-reaktiven Bestandteile in der Primerschicht infolge von Wärme und Licht führen und sollte daher vermieden werden. Es ist zweckmäßig, dass das Auftragen der Beschichtungszusammensetzungen für die Primerschicht und die Deckschicht in einem Prozessschritt mit Zwischentrocknung erfolgt. Dabei wird die zur Erzeugung der Primerschicht geeignete Beschichtungszusammensetzung zunächst physikalisch getrocknet (ohne dass die darin enthaltenen strahlungshärtenden Bestandteile vernetzt werden), bevor die zur Erzeugung der Deckschicht geeignete Beschichtungszusammensetzung aufgebracht wird. Zur Unterstützung der physikalischen Trocknung kann insbesondere ein Heißluftgebläse und/oder ein Infrarotstrahler vorgesehen werden.It is expedient to print the substrate with signs and / or patterns before applying the dirt-repellent coating. For reasons of occupational safety and in view of the simple handling, it is advantageous to apply the dirt-repellent, two-layer coating in the sense of an inline coating. In this way, skin irritations caused by uncrosslinked, UV-reactive groups can be avoided. A delay that is too long (in particular a period of several Hours or days) between applying the first coating composition suitable for forming the primer layer and applying the second coating composition suitable for forming the cover layer could lead to precrosslinking of the UV-reactive components in the primer layer due to heat and light and should therefore be avoided. It is expedient that the application of the coating compositions for the primer layer and the cover layer takes place in a process step with intermediate drying. In this case, the coating composition suitable for producing the primer layer is first physically dried (without crosslinking of the radiation-curing constituents contained therein) before the coating composition suitable for producing the cover layer is applied. To support the physical drying, in particular a hot air blower and / or an infrared radiator can be provided.
Oberhalb des Substrats und unterhalb der unteren Schicht (Primerschicht) können weitere Schichten vorhanden sein. Beispielsweise kann die insbesondere Zeichen und/oder Muster aufweisende Druckschicht auf einer Farbannahmeschicht aufgebracht sein, wobei sich die Farbannahmeschicht oberhalb des Substrats und unterhalb der unteren Schicht (Primerschicht) befindet Das Bereitstellen einer Farbannahmeschicht ist insbesondere dann zweckmäßig, wenn das Substrat ein Kunststoffsubstrat ist.Above the substrate and below the lower layer (primer layer) further layers may be present. By way of example, the printing layer, in particular having characters and / or patterns, can be applied to a dye-receiving layer, with the ink-accepting layer being above the substrate and below the lower layer (primer layer). Providing a dye-accepting layer is particularly expedient when the substrate is a plastic substrate.
Gemäß einer bevorzugten Variante kann die Primerschicht (insbesondere die physikalisch getrocknete, strahlungshärtende Primerschicht) vor dem Aufbringen der Deckschicht zum Teil mit einer weiteren Druckschicht, die Zeichen und/oder Muster aufweist, insbesondere einer UV-vernetzenden Druckschicht, versehen werden. Mit Bezug auf die UV-vernetzende Druckschicht eignet sich z.B. eine UV-trocknende Zifferung (z.B. die Seriennummer eines Wertdokuments). Nach Applikation der UV-vernetzenden Druckschicht auf die physikalisch getrocknete, strahlungshärtende Primerschicht erfolgt das Aufbringen der zur Herstellung der Deckschicht geeigneten strahlungshärtenden Zusammensetzung. Die Primerschicht, die UV-vernetzende Druckschicht und die Deckschicht werden danach mittels UV-Strahlung getrocknet bzw. vernetzt. Alle drei Schichten werden dabei untereinander vernetzt (im Sinne einer Vernetzung an der Grenzfläche zwischen zwei unterschiedlichen Schichten), so dass untereinander eine ausgezeichnete Haftung erzielt wird.According to a preferred variant, the primer layer (in particular the physically dried, radiation-curing primer layer) may be provided in part with a further print layer having characters and / or patterns, in particular a UV-crosslinking print layer, prior to the application of the cover layer. With respect to the UV-crosslinking print layer For example, a UV-drying code (eg the serial number of a value document) is suitable. After application of the UV-crosslinking printing layer to the physically dried, radiation-curing primer layer, the radiation-curing composition suitable for the production of the cover layer is applied. The primer layer, the UV-crosslinking print layer and the cover layer are then dried or crosslinked by means of UV radiation. All three layers are crosslinked with each other (in the sense of crosslinking at the interface between two different layers), so that an excellent adhesion is achieved with each other.
Alternativ zu der vorstehend beschriebenen, bevorzugten Variante kann die besagte, weitere Druckschicht, die Zeichen und/oder Muster aufweist, insbesondere eine UV-vernetzenden Druckschicht, erst nach der Applikation der physikalisch getrockneten, strahlungshärtenden Primerschicht und nach der Applikation der zur Herstellung der Deckschicht geeigneten strahlungshärtenden Zusammensetzung als oberste Schicht auf das Substrat appliziert werden. Die Primerschicht, die Deckschicht und die UV-vernetzende Druckschicht werden danach mittels UV-Strahlung getrocknet bzw. vernetzt. Alle drei Schichten werden dabei untereinander vernetzt (im Sinne einer Vernetzung an der Grenzfläche zwischen zwei unterschiedlichen Schichten), so dass untereinander eine ausgezeichnete Haftung erzielt wird. Diese Variante eignet sich insbesondere für die Ausstattung von Wertdokumenten mit einer fortlaufenden Ziffernfolge. Alternativ kann die oberste Druckschicht erst in einem zweiten Prozess-Schritt appliziert und separat getrocknet bzw. vernetzt werden.As an alternative to the preferred variant described above, the said further printing layer which has characters and / or patterns, in particular a UV-crosslinking printing layer, can be applied only after the application of the physically dried, radiation-curing primer layer and after application of those suitable for the production of the cover layer radiation-curing composition as the top layer to be applied to the substrate. The primer layer, the cover layer and the UV-crosslinking printing layer are then dried or crosslinked by means of UV radiation. All three layers are crosslinked with each other (in the sense of crosslinking at the interface between two different layers), so that an excellent adhesion is achieved with each other. This variant is particularly suitable for equipping value documents with a consecutive number sequence. Alternatively, the uppermost printing layer can be applied only in a second process step and dried or crosslinked separately.
Die schmutzabweisende Beschichtung ist bevorzugt transparent und farblos, insbesondere wenn ein bedrucktes Substrat möglichst gut sichtbar bleiben soll. Natürlich kann auch die Primerschicht und/oder die Deckschicht mit einer Farbtönung, mit einer Mattierung oder mit sonstigen Funktionen ausgestattet werden.The soil-repellent coating is preferably transparent and colorless, especially if a printed substrate remain as visible as possible should. Of course, the primer layer and / or the cover layer can be provided with a color tint, with a matting or with other functions.
Es ist zweckmäßig, die Beschichtungszusammensetzungen für die Primerschicht und für die Deckschicht jeweils in einer Schichtstärke bzw. -dicke in einem Bereich von 1,0 bis 4,0 µm pro Einzelbeschichtung nass auf das Substrat zu applizieren.It is expedient to wet apply the coating compositions for the primer layer and for the cover layer in a layer thickness or thickness in a range of 1.0 to 4.0 microns per single coating on the substrate.
Die bevorzugte Nassfilm-Schichtstärke für die Primerschicht liegt in einem Bereich von 1,3 bis 4,0 µm. Die Schichtstärke sollte an die jeweilige Substratqualität (nämlich die Rauhigkeit der jeweiligen Substratseite) angepasst werden. Die Schichtdicke sollte ausreichend sein, um im Falle poröser Substrate die unregelmäßigen Vertiefungen und Poren zumindest im Wesentlichen zu schließen.The preferred wet film layer thickness for the primer layer is in a range of 1.3 to 4.0 μm. The layer thickness should be adapted to the respective substrate quality (namely the roughness of the respective substrate side). The layer thickness should be sufficient to at least substantially close the irregular depressions and pores in the case of porous substrates.
Die bevorzugte Nassfilm-Schichtstärke für die Deckschicht liegt einem Bereich von 1,5 bis 3,0 µm.The preferred wet film layer thickness for the cover layer is in a range of 1.5 to 3.0 μm.
Die Beschichtungszusammensetzungen für die Primerschicht und für die Deckschicht können z.B. jeweils durch das Flexodruckverfahren auf das Substrat aufgebracht werden. Im Flexodruckverfahren wird die Beschichtungsstärke unter anderem über das theoretische Schöpfvolumen der Raster- bzw. Aniloxwalze gesteuert. Das Übertragungsverhalten, d.h. die übertragene Lackmenge, ist des Weiteren von der Oberflächenspannung des Lacks, den Kapillarkräften des Substrats, der Oberflächenspannung der Druckplatte oder des Gummituchs und den rheologischen Eigenschaften (z.B. Viskosität, Elastizität) der Lacke bei der Applikation abhängig.For example, the coating compositions for the primer layer and for the topcoat may each be applied to the substrate by the flexographic printing process. In the flexographic printing process, the coating thickness is controlled, inter alia, via the theoretical scoop volume of the raster or anilox roll. The transfer behavior, ie the amount of lacquer transferred, is furthermore dependent on the surface tension of the lacquer, the capillary forces of the substrate, the surface tension of the printing plate or the blanket and the rheological properties (eg viscosity, elasticity) of the lacquers during application.
Geeignete Beschichtungszusammensetzungen zur Herstellung der Primerschicht, die wasserbasierend sind und UV-reaktive Komponenten beinhalten, haben bevorzugt eine Viskosität von 25 bis 150 sec (insbesondere bevorzugt 40 bis 90 sec), gemessen mit DIN 4 Cup-Becher bei 20°C.Suitable coating compositions for the preparation of the primer layer, which are water-based and include UV-reactive components, preferably have a viscosity of 25 to 150 seconds (more preferably 40 to 90 seconds) measured with
Geeignete Beschichtungszusammensetzungen zur Herstellung der Deckschicht, die UV-trocknend sind, haben bevorzugt eine Viskosität von 30 bis 150 sec, gemessen mit DIN 4 Cup-Becher bei 20°C.Suitable coating compositions for the preparation of the cover layer, which are UV-drying, preferably have a viscosity of 30 to 150 seconds, measured with
Das Wertdokument-Substrat muss nicht unbedingt vollflächig, sondern kann auch teilflächig (d.h. partiell) an einer oder an beiden Oberflächen mit der schmutzabweisenden, zweilagigen Beschichtung versehen werden. Dieses Vorgehen eignet sich insbesondere dann, wenn das Wertdokument bestimmte, optisch variable Fälschungssicherungsmittel aufweist, die infolge einer möglichen Beeinträchtigung des optischen Effekts nicht mit einer solchen schmutzabweisenden Beschichtung versehen werden sollten. Zu solchen Fälschungssicherungsmitteln gehören u.a. Sicherheitselemente mit einer mikrooptischen Darstellungsanordnung mit Mikrostrukturen sowie Mikroabbildungselementen zur vergrößerten Abbildung der Mikrostrukturen, z.B. Mikrolinsen- oder Mikrohohlspiegelarrays. Sicherheitsmerkmale auf Basis von mikrooptischen Darstellungsanordnungen sind z.B. aus
- 61,5 Gew.-% Polyesteracrylat-Prepolymer ("Laromer PE 55 F" der Fa. BASF)61.5% by weight of polyester acrylate prepolymer ("Laromer PE 55 F" from BASF)
- 10 Gew.-% Trimethylolpropan-Triacrylat ("Laromer TMPTA" der Fa. BASF)10% by weight of trimethylolpropane triacrylate ("Laromer TMPTA" from BASF)
- 20 Gew.-% Hexandioldiacrylat ("Laromer HDDA" der Fa. BASF)20% by weight of hexanediol diacrylate ("Laromer HDDA" from BASF)
- 5 Gew.-% Photoinitiator ("Darocure 1173" der Fa. CIBA)5% by weight of photoinitiator ("Darocure 1173" from CIBA)
- 3 Gew.-% Reaktives Amin-Additiv zur Beschleunigung der UV-Härtung ("Ebecryl P 115")3% by weight of reactive amine additive for accelerating UV curing ("Ebecryl P 115")
- 0,5 Gew.-% Entschäumer ("Coatosil")0.5% by weight defoamer ("coatosil")
Der Hochglanzlack kann als Spot-Beschichtung im Flexo-, Offset- oder Hochdruckverfahren appliziert werden. Es wird bevorzugt, die Viskosität des Hochglanzlacks in einem Bereich von 30 bis 150 sec, insbesondere 30 bis 80 sec, Auslaufzeit gemäß DIN 4 CUP-Becher bei 20°C einzustellen.The high gloss lacquer can be applied as a spot coating in the flexo, offset or high pressure process. It is preferred to adjust the viscosity of the high-gloss lacquer in a range of 30 to 150 sec, in particular 30 to 80 sec, flow time according to
Mit Bezug auf das Wertdokument-Substrat gibt es keine speziellen Beschränkungen. Banknotenpapiere werden typischerweise aus Fasern von Einjahrespflanzen, insbesondere Baumwollfasern oder Zellstofffasern, hergestellt. Es können auch Papiere verwendet werden, die zum Teil Kunststofffasern, vorzugsweise Polyamidfasern oder Polyesterfasern, aufweisen. Als Wertdokument-Substrat eignet sich darüber hinaus ein Polymersubstrat (bzw. Kunststoffsubstrat), das eine geeignete Farbannahmeschicht aufweist. Besonders bevorzugt wird ein Baumwollpapier als Substrat verwendet. Das Flächengewicht des Substrats variiert je nach Anwendungsform. Übliche Flächengewichte liegen im Bereich von 50 g/m2 bis 100 g/m2, vorzugsweise im Bereich von 60 g/m2 bis 90 g/m2, besonders bevorzugt bei etwa 70 g/m2. Bei mehrlagigen Substraten können die einzelnen Papierlagen aus gleichen oder aus unterschiedlichen Papiersorten bestehen. Beispielsweise kann eine Papierlage ein reines Baumwollpapier sein, während eine weitere Papierlage Kunststofffasern aufweist. Des Weiteren können als das Substrat auch mehrlagige Papier/Folie-Verbunde herangezogen werden, wie etwa ein Papier/Folie/Papier-Verbund oder ein Folie/Papier/Folie-Verbund.With respect to the value-document substrate, there are no particular restrictions. Banknote papers are typically made from fibers of annual plants, especially cotton fibers or pulp fibers. It is also possible to use papers which partly comprise synthetic fibers, preferably polyamide fibers or polyester fibers. As a valuable document substrate is also a polymer substrate (or plastic substrate), which has a suitable ink receiving layer. More preferably, a cotton paper is used as the substrate. The basis weight of the substrate varies depending on the application form. Typical basis weights are in the range of 50 g / m 2 to 100 g / m 2 , preferably in the range of 60 g / m 2 to 90 g / m 2 , more preferably about 70 g / m 2 . For multi-layer substrates, the individual paper layers may consist of the same or different types of paper. For example, a paper layer may be a pure cotton paper, while another paper layer may comprise plastic fibers. Furthermore, multi-ply paper / film composites such as a paper / film / paper composite or a film / paper / film composite can also be used as the substrate.
Auch hinsichtlich der Art der Herstellung des Wertdokument-Substrats gibt es keine speziellen Einschränkungen. Die Herstellung erfolgt bevorzugt mittels einer Rundsiebmaschine.Also, there are no particular restrictions on the manner of manufacturing the valuable document substrate. The production preferably takes place by means of a rotary screening machine.
Weitere Ausführungsbeispiele sowie Vorteile der Erfindung werden nachfolgend anhand der Figuren erläutert, bei deren Darstellung auf eine maßstabs- und proportionsgetreue Wiedergabe verzichtet wurde, um die Anschaulichkeit zu erhöhen.Further exemplary embodiments and advantages of the invention are explained below with reference to the figures, in the representation of which a representation true to scale and proportion has been dispensed with in order to increase the clarity.
Es zeigen:
- Fig. 1a-1e
- die einzelnen Schritt zur Herstellung eines erfindungsgemäßen Wertdokuments, wobei der Einfachheit halber nur die Applikation der zweilagigen, schmutzabweisenden Beschichtung auf eine Substratoberfläche gezeigt wird; und
- Fig. 2
- eine schematische Darstellung eines Wertdokuments, das optisch variable Fälschungssicherungsmittel, nämlich einen eingebetteten Fenstersicherheitsfaden und ein aufgeklebtes, Patchförmiges Sicherheitselement, aufweist und partiell mit der zweilagigen, schmutzabweisenden Beschichtung versehen ist.
- Fig. 1a-1e
- the individual step for producing a value document according to the invention, wherein for the sake of simplicity, only the application of the two-layer, dirt-repellent coating is shown on a substrate surface; and
- Fig. 2
- a schematic representation of a value document, the optically variable anti-counterfeiting agent, namely an embedded window security thread and a glued, patch-shaped security element, and is partially provided with the two-ply, dirt-repellent coating.
Auf das mit einer Druckschicht 2 versehene Substrat 1 wird zunächst die oben im "Beispiel A" beschriebene, wasserbasierende Beschichtungszusammensetzung 3, die zur Erzeugung einer Primerschicht geeignet ist, im Flexodruckverfahren aufgetragen (siehe
Auf das mit der physikalisch getrockneten, strahlungshärtenden Primerschicht 4 ausgestatteten Substrat 1 wird der oben im "Beispiel C" beschriebene UV-trocknende Decklack 5 appliziert (siehe
Das Patch-förmige Sicherheitselement 8 und der Fenstersicherheitsfaden 7 sind jeweils mit einem die Wahrnehmbarkeit des optisch variablen Effekts im Wesentlichen nicht beeinflussenden, verschmutzungsbeständigen Hochglanzlack versehen. Im vorliegenden Beispiel ist der Hochglanzlack ein auf der oben beschriebenen Zusammensetzung "Beispiel D" basierender UV-Lack und wird im Flexodruckverfahren oder Offsetdruckverfahren in den Bereichen 10 und II auf das Wertdokument aufgebracht. Der Hochglanzlack ist nicht registergenau oberhalb der Fälschungssicherungsmittel 7 und 8 appliziert, sondern der Lack überdeckt auch angrenzende Teile des Wertdokuments, die die Fälschungssicherungsmittel 7 und 8 umgeben und sozusagen Randbereiche für die Fälschungssicherungsmittel 7 und 8 bilden. Die Schichtdicke des Hochglanzlacks beträgt im vorliegenden Beispiel 1,5 µm.The patch-shaped
Das Wertdokument 6 ist außerhalb der die Fälschungssicherungsmittel 7 und 8 umgebenden Bereiche II und 10 partiell mit der schmutzabweisenden, zweilagigen Beschichtung 11 versehen. Die Beschichtung 11 besteht aus den in
Claims (7)
das erhaltene flächige Substrat ein optisch variables Fälschungssicherungsmittel aufweist, das an seiner Oberfläche zur Erhöhung der Verschmutzungsbeständigkeit mit einem Hochglanzlack versehen ist,
der Hochglanzlack eine Schichtdicke in einem Bereich von 0,7 bis 1,5 µm aufweist, und
das flächige Substrat an seiner außerhalb des optisch variablen Fälschungssicherungsmittels liegenden Oberfläche zumindest teilweise mit der eine Primerschicht und eine Deckschicht aufweisenden, schmutzabweisenden Beschichtung versehen ist.Method according to one of claims 1 to 5, wherein the method is carried out such that
the flat substrate obtained has an optically variable anti-counterfeiting agent, which is provided on its surface with a high-gloss varnish to increase the resistance to fouling,
the high gloss lacquer has a layer thickness in a range of 0.7 to 1.5 μm, and
the planar substrate is at least partially provided on its surface located outside the optically variable counterfeit securing means with the dirt-repellent coating having a primer layer and a cover layer.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE102012004195A DE102012004195A1 (en) | 2012-03-01 | 2012-03-01 | Method for producing a value document and value document available therefrom |
Publications (2)
Publication Number | Publication Date |
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EP2639075A1 true EP2639075A1 (en) | 2013-09-18 |
EP2639075B1 EP2639075B1 (en) | 2015-01-14 |
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ID=47789947
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP13000930.1A Not-in-force EP2639075B1 (en) | 2012-03-01 | 2013-02-25 | Method for producing a valuable document and valuable document derived from the method |
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EP (1) | EP2639075B1 (en) |
DE (1) | DE102012004195A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017197061A1 (en) * | 2016-05-11 | 2017-11-16 | Neenah Paper, Inc. | Security document having enhanced foil durability |
CN114026288A (en) * | 2019-05-28 | 2022-02-08 | 阿塔卡化工(施密德吕纳股份公司) | Method for painting a substrate and painted substrate |
CN114423619A (en) * | 2019-09-20 | 2022-04-29 | 捷德货币技术有限责任公司 | Method for producing a security element and security element |
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Cited By (5)
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WO2017197061A1 (en) * | 2016-05-11 | 2017-11-16 | Neenah Paper, Inc. | Security document having enhanced foil durability |
US10434814B2 (en) | 2016-05-11 | 2019-10-08 | Neenah, Inc. | Security document having enhanced foil durability |
CN114026288A (en) * | 2019-05-28 | 2022-02-08 | 阿塔卡化工(施密德吕纳股份公司) | Method for painting a substrate and painted substrate |
CN114423619A (en) * | 2019-09-20 | 2022-04-29 | 捷德货币技术有限责任公司 | Method for producing a security element and security element |
CN114423619B (en) * | 2019-09-20 | 2023-07-25 | 捷德货币技术有限责任公司 | Method for producing a security element and security element |
Also Published As
Publication number | Publication date |
---|---|
EP2639075B1 (en) | 2015-01-14 |
DE102012004195A1 (en) | 2013-09-05 |
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