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EP3286010B1 - Procédé servant à fabriquer un élément de sécurité avec un alignement entre un élément d'impression et un filigrane - Google Patents

Procédé servant à fabriquer un élément de sécurité avec un alignement entre un élément d'impression et un filigrane Download PDF

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Publication number
EP3286010B1
EP3286010B1 EP16716473.0A EP16716473A EP3286010B1 EP 3286010 B1 EP3286010 B1 EP 3286010B1 EP 16716473 A EP16716473 A EP 16716473A EP 3286010 B1 EP3286010 B1 EP 3286010B1
Authority
EP
European Patent Office
Prior art keywords
watermark
colourant
radiation
substrate
colorant
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.)
Active
Application number
EP16716473.0A
Other languages
German (de)
English (en)
Other versions
EP3286010A1 (fr
Inventor
Jana Kisselova
Harald Reiner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giesecke and Devrient Currency Technology GmbH
Original Assignee
Giesecke and Devrient Currency Technology GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Publication of EP3286010A1 publication Critical patent/EP3286010A1/fr
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Publication of EP3286010B1 publication Critical patent/EP3286010B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14—Security printing
    • 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
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/333—Watermarks
    • 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
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks
    • B42D25/387—Special inks absorbing or reflecting ultraviolet light
    • 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
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/41—Marking using electromagnetic radiation
    • 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
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/43—Marking by removal of material
    • B42D25/435—Marking by removal of material using electromagnetic radiation, e.g. laser
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14—Security printing
    • B41M3/144—Security printing using fluorescent, luminescent or iridescent effects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/24—Ablative recording, e.g. by burning marks; Spark recording
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used

Definitions

  • the invention relates to a method for producing a security element, wherein a substrate is provided, which has a front and a back, at least for certain radiation is translucent and has a watermark, which modulates the opacity of the substrate is applied to the front of a printing element which at least partially covers the watermark and which contains at least a first and a second colorant, wherein the first colorant is ablatable by the first specific radiation and the second is not and the substrate irradiates from the backside with the particular radiation and the first colorant of the first predetermined radiation is ablated, the watermark being used as a mask to modify the printing element in the register to the watermark.
  • Such a method is from the DE 102012003601 A1 known.
  • watermarks are known. They are usually introduced in the production of the substrate from which the security element is made, usually a paper. Watermarks are easily recognizable when the security element is viewed through transmitted light, since they modify the opacity of the substrate. As a rule, in the production of the paper, the thickness of the substrate is varied, so that a reduction in thickness leads to an opacity reduction. But there are also other approaches for generating a watermark known, for example by means of so-called Watermark colors that also locally modify the opacity of the substrate.
  • watermarks are usually formed in the substrate in the production of the starting material for the security element, for example in the production of a banknote paper, it is fundamentally difficult in later printing to arrange printed elements in an exact position relative to the watermark, that is to pass. This problem arises regardless of the specific design of the printing element, not only when printing with different inks, but also during coating or application with printing elements, when applying transfer films or laminating or when applying a window suture.
  • the aforementioned DE 102012003601 A1 Therefore proposes to use the locally varying opacity of the watermark as a mask to modify a previously applied surface pressure element in the register to the watermark by means of laser radiation.
  • ablation is mentioned.
  • the pressure element may contain a mixture of substances that are modifiable and that are not modifiable.
  • the watermark serves as a mask which modulates the intensity of the transmitted radiation, whereby the printing element is modified, for example ablated.
  • the invention is based on the object to provide a manufacturing method for a security element whose security against counterfeiting is increased again.
  • a substrate which has a front and a back, at least for certain radiation is translucent and has a watermark, which modulates the opacity of the substrate, on the front Printing element is applied, which at least partially covers the watermark and containing at least a first and a second colorant, wherein the first colorant is ablatierbar by means of the first specific radiation and the second not, and the substrate from the back irradiated with the particular radiation and the ablating the first colorant from the particular radiation, the watermark being used as a mask to attenuate the intensity of the particular radiation to modify the printing element in the register to the watermark, the first colorant being a remittent colorant having a color effect i is disposed in a first color layer, and the second colorant is a luminescent colorant and is disposed in a second color layer, the first color layer covers the second, and wherein the second colorant is exposed at locations by using
  • the object is also achieved according to the invention with a method for producing a security element, wherein a substrate is provided which has a front and a back, at least for certain radiation is translucent and has a watermark, which modulates the opacity of the substrate, on the front a printing element is applied, which at least partially covers the watermark and which contains at least a first and a second colorant, wherein the first colorant is ablatierbar by means of the first specific radiation and the second, and the substrate is irradiated from the backside with the particular radiation and the first colorant is ablated from the particular radiation, the watermark being used as a mask to attenuate the intensity of the particular radiation to modify the printing element in the register to the watermark, wherein the first colorant is a colorant remitting colorant and the second colorant is a luminescent colorant, the first colorant and the second colorant are disposed in a common color layer, and the second colorant is exposed at locations by using the first colorant using the watermark as
  • the second colorant is exposed in both variants mentioned (colorant in separate color layers or in a common color layer) by changing the color effect of the first colorant and thus repealed. This can be done by completely or partially removing the first colorant from the corresponding color layer. Alternatively, it is also possible that only the optical properties of the colorant are changed so that it no longer shows the color effect. This is possible, for example, by breaking bonds in the colorant, for example in pigments. It is therefore possible according to the invention to change the colorant with regard to the color effect, both by removing it from the layer (ablation) and, while it remains in the layer, but is modified there. As far as the option of ablation is described below, this is to be understood as an example only, and the corresponding description also refers to the variant that the first colorant is modified.
  • the luminescent image in the register for the see-through or supervisory image achieved either by providing the first colorant in a first color layer and the second colorant in a second color layer and the two color layers are arranged so that the first color layer on the second color layer, or that both colorants are in a common color layer.
  • the first colorant is removed / modified by ablating / modifying the first color layer, and the second colorant in the second color layer is exposed.
  • the brilliance of the second colorant is particularly large. If the colorants in a common color layer, the production is easier.
  • the first colorant is then ablated / modified from the color layer so that the effect of the second colorant thus increases in the color layer.
  • the invention thus forms that in the DE 102012003601 A1
  • the concept disclosed by radiation to modify a previously applied flat printing element using the watermark as a mask to attenuate the intensity of the radiation further implies that the particular radiation ablates only one of two colorants.
  • the second luminescent colorant is exposed, which also means that the concentration of the second colorant in the layer system increases.
  • the security element provides a sight as seen from the DE 102012003601 A1 is known.
  • a luminescent image is displayed which is negative to the supervisory image under normal illumination and to the see-through image. The images are in perfect register with each other, since the second colorant is exposed there and gives off strongly the luminescent radiation, where the first colorant was removed.
  • the exposure of the second colorant and thus the intensity of the image recognizable in luminescence is inverse to the color impression, which is mediated in a plan view or in a view through the first colorant.
  • the pressure element cooperates with an additional layer, the visual effect of which depends on the prior modification of the pressure element.
  • optically variable layers that they are particularly clearly recognizable on a dark or black background in incident light.
  • an optically variable layer ie without registration requirements, whose visual effect, due to the precise registration of the printing element acting as background, then automatically lies in the register with the watermark, although the optically variable one Layer itself was applied without Passeran petitionen.
  • a part of the layer system is applied and illuminated with the specific irradiation. Another part of the layer system is then applied only after the exposure.
  • the physical removal of the first colorant can be done directly or indirectly.
  • the particular radiation removes an element which in turn removes all or part of the first color layer or colorant.
  • a layer which influences the adhesion of the first color layer to the second color layer can be modified by means of the specific radiation. After the modification of this the adhesion, the first color layer is then removed in those areas where the adhesion has been modified (or not modified in the inverse case). The procedure is similar to the principle of the so-called wash color.
  • Another possibility is an indirect modification of a developer layer which, in cooperation with a developer or fixing medium, modifies the first color layer at those points at which the developer layer has been suitably exposed.
  • Indirect influence is also possible in a two-stage process if the printing element has an adhesive layer for the first color layer, which is applied to the front side and exposed from the rear side with the participation of the watermark as a mask.
  • the first ink layer of the printing element can then be applied, which adheres only to those places where the exposure took place.
  • the exposed adhesive layer can also be acted upon here in an intermediate step so that it remains only in those areas in which a suitable exposure took place (positive effect) or remains in those areas in which no suitable exposure took place (negative effect).
  • pressure element is understood to mean an element applied to a substrate, which optionally, after further processing, realizes a visually or mechanically evaluable element.
  • printing elements based on printing inks. As far as this description speaks of a printing ink, this is to be understood by way of example for a printing element.
  • Colorants or coloring substances are known to be subdivided into dyes and color pigments. Dyes are colorants that are soluble in the application medium, whereas color pigments are colorants that are insoluble in the application medium.
  • colorant and “color” are not limited to a colorful sensory impression with respect to the remittant colorant.
  • An achromatic effect for example by black or metallic colorants, is possible for the remittant colorant.
  • the remittant colorant may in particular achromatic pigments, such as. As black or silver pigments, colored pigments, effect color pigments or color-shift pigments.
  • Colorants with silver pigments are printed, for example, with a layer thickness or mass per unit area of 0.5 g / m 2 to 2.0 g / m 2 and preferably from 0.8 g / m 2 to 1.5 g / m 2 .
  • the watermark can be generated by varying the thickness of the substrate at a constant density, by varying the density of the substrate with a constant thickness or by a so-called watermark color.
  • the latter are also referred to as "spurious" watermarks.
  • the watermark can binary modulate the opacity of a substrate. that is, it produces a structure which can be seen in the transparency in that the substrate is less opaque or more translucent at individual locations than at other locations. But there are also watermarks in the sense of a gray scale modulation possible, which modulate the opacity or translucency between two maximum values. In the transmitted light view, one then recognizes a grayscale image. Both types of watermarks are equally suitable for the present printing process.
  • the first color layer or colorant and the particular radiation are matched to one another such that the particular radiation is capable of ablating / modifying the first colorant, the watermark modulating the opacity of the substrate being used as a mask to modulate the colorant Intensity of the particular radiation is used.
  • the term "certain radiation” expresses this.
  • the ablation / modification is achieved when the particular radiation at the front has a suitable intensity.
  • the watermarked opacity modulation modulates the intensity of the radiation on the front face on which the printing element is located.
  • the radiation intensity on the backside is therefore adjusted so that the opacity modulation caused by the watermark on the front side results in a radiation modulation which modulates the modification / ablation effect.
  • the radiation intensity on the back is chosen so that where the watermark is the lowest Opacity in the substrate causes the greatest effect occurs, where no or only a very small ablation / modification is achieved at the points where the watermark causes the highest opacity of the substrate.
  • the watermark serves as an intensity mask when the substrate is irradiated with the particular radiation.
  • the exposed second luminescent colorant shows in the luminescent image, which is recognizable, for example, when viewed under UV-containing illumination, a main pattern, which is defined by the structure of the exposed second colorant. If the particular radiation is applied so that the first colorant is either completely or completely removed, the luminescence image corresponds to a pure black and white image without tints. Equally, it is also possible to adjust the ablation by the watermark so that a partial ablation of the first colorant takes place. This partial ablation weakens the absorbing action of the first colorant such that at the partially ablated sites in the luminescent image there is an intensity intermediate between that obtained upon complete exposure of the second colorant and that present with unaffected first colorant.
  • a grayscale representation by half or multi-tone screening is possible, as is known in the gray scale representation by screened image representation.
  • the watermark is then patterned accordingly to provide the appropriate variation of opacity as an intensity mask for the effect of the particular radiation on the first colorant.
  • the beam may be in the form of a laser beam, for example. It's not just easy then, the required To provide radiation intensity, the intensity adjustment can be done easily, since it is less effort to adjust a beam in its intensity, as to effect a homogeneous intensity adjustment of a fanned-out light beam. Nevertheless, for certain embodiments, a far field irradiation of the particular radiation is possible.
  • the use of a rasterized beam has the advantage that the intensity of the particular radiation can be varied in addition to using the watermark as a mask to effect additional patterning according to a first auxiliary pattern.
  • this additional pattern is not in the register for the watermark. It is therefore provided in a development that the specific radiation is structured or modulated so that a first additional pattern is omitted, that is not irradiated, in which then consequently the first colorant is not ablated.
  • the intensity of the luminescence radiation from the second colorant remains further attenuated due to the non-ablated first colorant, which makes the first additional pattern clearly recognizable in the luminescence image.
  • a second additional pattern is formed with the second colorant.
  • This development can be combined with the training that forms the first pattern.
  • the second additional pattern is produced by also removing the second colorant in the exposed areas with another radiation. In the luminescence image, the second additional pattern can then be recognized by locations of no luminescence. In the region of the second additional pattern not only the first colorant is removed, but also the second luminescent colorant.
  • This embodiment can be realized particularly simply by the fact that the particular radiation and the further radiation originate from the same laser source, for example by the laser source emitting pulsed laser radiation to provide the particular radiation, ie ablating the first colorant and continuous wave radiation to ablate the second colorant.
  • a third additional pattern in the form of a recess in the color layer is provided when applying the first and second color layer.
  • the effect of this third additional pattern is substantially the same as that of the second additional pattern, however, this third additional pattern can be placed completely independent of the variation of opacity by the watermark, since no color layer removal is necessary in the structure of the third motif. It is also possible in areas outside the watermark.
  • the first color layer and the second color layer are selected such that in a wavelength range in which the particular radiation is located, the first color layer absorbs more strongly than the second color layer.
  • infrared radiation is used as the specific radiation, and the second color layer is transparent in this area.
  • a particularly preferred spectral range of the infrared radiation is the spectral range between 1000 nm and 1100 nm.
  • ink used here stands out for the printing effect achieved by the watermark-masked and radiation-based modification.
  • the ink itself can also include structures that go beyond conventional printing systems, such as a foil coating or metallization.
  • Items to be protected within the scope of this description may include, for example, security papers, identity and value documents (such as banknotes, passports, identity cards, shares, bonds, certificates, vouchers, checks, tickets, etc.) as well as product security elements such as security items. Labels, seals, packaging, where a watermark is possible.
  • identity and value documents such as banknotes, passports, identity cards, shares, bonds, certificates, vouchers, checks, tickets, etc.
  • product security elements such as security items. Labels, seals, packaging, where a watermark is possible.
  • security paper is understood here to mean, in particular, the precursor that can not yet be processed to a value document (eg a banknote) which, in addition to the pressure produced according to the invention, can also have other authenticity features (such as luminescent substances provided in the volume, for example).
  • value documents here on the one hand from security papers produced documents, eg. B. banknotes understood.
  • value documents can also be other documents and articles which are processed with the printing method according to the invention, so that the value documents have non-copyable authenticity features, whereby an authenticity check is possible and at the same time unwanted copies are prevented.
  • the substrate is particularly preferably made of paper made of cotton fibers, as used for example for banknotes.
  • the substrate may also be made of paper of other natural fibers, also preferably of synthetic fibers, ie a mixture of natural and synthetic fibers.
  • the substrate consists of a combination from at least two superimposed and interconnected different substrates, a so-called hybrid. It may be, for example, a combination of plastic film paper or even a three-layer composite, such as plastic film-paper plastic film, ie a substrate of paper is covered on either side by a plastic film, or paper-plastic film paper, ie Substrate made of a plastic film is covered on each side by a paper substrate.
  • the substrate consists of an at least partially transparent plastic film.
  • the watermark is generated in this case by a color which is applied to one side of the substrate and whose hue is at least similar to the hue of the substrate.
  • a watermark is for example off DE 102009056462 A1 known.
  • the reciprocal property of translucency is opacity. As far as there is talk here that a watermark modulates the opacity, it can equally be said that it inversely modulates the translucency.
  • Fig. 1a shows in a sectional view of a security element 1, wherein for simplicity, only a substrate 2 is drawn.
  • the substrate 2 has a front side 3 (which is arranged at the bottom in the figures without further restriction) and a rear side 4.
  • a watermark 5 is incorporated, which modulates the thickness of the substrate 2 and thus its opacity.
  • This opacity modulation is in Fig. 1b which schematically shows a view from the front side 3 of the substrate 2.
  • regions 7 where the thickness is reduced by an average amount
  • the substrate 2 has a medium opacity.
  • the substrate 2 has a low opacity or a high translucency.
  • an ink layer 9 is applied to the front side 3, whose ink-repellent colorant can be ablated by means of laser radiation or modified with respect to a color effect.
  • a fluorescent ink layer 22 containing a luminescent colorant.
  • Fig. 2a and 2b show the substrate 2 with applied on the front side 3 ink layer 9 and fluorescent ink layer 22. They are in this state (yet) not further structured, but at least partially cover the area in which the watermark 5 in the substrate 2 is present.
  • the ink layer and the fluorescent ink layer are combined in a common color layer 64 which contains both the remitting and the luminescent colorant.
  • a laser beam 10 is now passed over the substrate. It radiates through the substrate 2.
  • the wavelength of the laser beam is such that the remitting colorant is absorbed by the radiation and modified or ablated.
  • the laser beam 10 is attenuated depending on the opacity of the substrate 2, which is modulated by the watermark 5.
  • the laser beam 10 is greatly attenuated.
  • the laser beam is least attenuated.
  • Fig. 2a and b This is schematically illustrated by the thickness of the laser beam 10. In fact, of course, only the intensity of the laser beam 10, but not its radiation cross section when passing through the substrate 2 is attenuated.
  • the intensity of the laser beam 10 is adjusted so that the watermark intensity mask as a modulation of the effect on the remittant colorant z.
  • the ink layer 9 causes the laser beam 10 to have the ink layer 9 or ink layer 64 applied to the front side 3: in the region 8 having low opacity, the remittant colorant is ablated or modified to a maximum extent in areas 7 having medium opacity , and in areas 6 with maximum opacity, the least or possibly even no ablation / modification occurs.
  • the ink layer 9 / the color layer 64 on the front side 3 covers the region in which the watermark 5 is formed in the substrate 2.
  • the fluorescent colorant is not ablated / modified by the laser beam 10, z. B. transparent to the laser beam 10.
  • the described embodiment may be modified such that instead of a watermark, the opacity by a thickness variation modulates the substrate, a so-called “fake” or printed watermark occurs, so a watermark, which was generated on the substrate 2 by a so-called watermark color.
  • the Fig. 3a and 3b schematically show the provision of such a printed watermark.
  • a watermark ink 11 is printed on the back 4 of the substrate 2.
  • the watermark color 11 penetrates according to Fig. 3b into the substrate 2 and causes after drying or other suitable processing, a translucency 12 in the substrate 2 at the points where the watermark ink 11 was printed.
  • Fig. 4 which shows purely by way of example two color layers 9 and 22, but can also be realized with a common color layer 64, shown, the substrate 2 with the printed watermark 12 with the laser beam 10, in turn results in the effect that the laser beam 10 at positions 10a in which the watermark or watermark color increases the translucency of the substrate 2, is attenuated less in intensity than at positions 10b where the watermark does not have this effect.
  • ablation / modification of the remittant colorant in the exact register to the watermark is obtained without the registration of the ink layer 9, color layer 64, of this register.
  • Fig. 5a to 5c relate to a third embodiment in which additionally on the front side 3, a non-modifiable by the laser radiation 10 coating 13 has been applied, which is transparent to the laser radiation 10 and thus does not attenuate this.
  • a system with two layers 3 and 22 is shown purely by way of example.
  • a common color layer 64 is equally possible.
  • Fig. 5a shows a sectional view similar to the Fig. 2 , wherein now in some areas, the non-modifiable by the laser radiation, but still absorbing coating 13 is applied.
  • Fig. 5b shows a plan view of the back 4 with the coating 13th
  • the ink layer 9 is influenced to varying degrees by the laser radiation 10, resulting in the different regions 14, 15 and 16 .
  • the ink layer 9 is almost unaffected, since the energy of the laser beam is greatly attenuated due to the opacity of the substrate 2.
  • the ink layer 9 is modified, for example ablated, due to an average laser energy attenuation by the substrate due to the average opacity of the substrate 2.
  • the laser beam had a strong effect on the ink layer 9 in the region 15, because there the substrate 2 has a low opacity and only slightly weakened the laser beam.
  • the variant of Fig. 5 can also be configured so that the coating 13 does not absorb the laser radiation, but is a luminescent ink layer on the back of the substrate in the transmitted light additive color mixing with the luminescent colorant, which was exposed differently on the front as described by means of laser radiation ,
  • the described embodiments can also be realized with a watermark that was generated by a watermark color and not by a thickness modulation.
  • a watermark ink is available, for example, from Sun Chemical under the designation 669440 Vernes UVSP (art.No .: JV 40000009).
  • two different ink layers can be used, which can be modified by radiation of different spectral ranges. This makes it possible to work with different intensity profiles for these two radiations or to print on the front and back the same area with radiation-modified ink layers in the register to the watermark.
  • a first ink layer is applied to the front and a second ink layer on the back. Subsequently, these ink layers are exposed and modified by laser radiation from the back side (for the ink layer located on the front side) or the back side (for the ink layer located on the front side).
  • a black, soot-based offset ink was printed over the area of a watermark after a fluorescent ink layer had been printed.
  • the paint was dried for several days and then by means of a ND vanadate laser ablated from the back of the color located on the front. In areas of low paper thickness, ie maximum translucent watermark, 80% to 95% of the color was thereby removed. In areas of maximum paper thickness, ie minimal translucency of the watermark, only 10% to 30% of the color was ablated.
  • the area of a watermark on the front side was overprinted by means of an OVI screen printing ink WP from the manufacturer SICPA.
  • the paint dried out for several days. Subsequently, the color on the front side was ablated by means of a Nd: Yag laser from the rear side. In areas of low paper thickness, 80% to 95% of the paint was removed. In areas of maximum paper thickness, 10% to 30% of the paint was ablated.
  • the area of a watermark on the front side was overprinted after a fluorescent ink layer had been printed.
  • the paint dried out for several days.
  • the color on the front side was ablated by means of a Nd: Yag laser from the rear side. In areas of low paper thickness, 80% to 95% of the color except a yellow colorant was removed. In areas of maximum paper thickness, 10% to 30% of the paint was ablated.
  • the Fig. 6 to 9 show different images of the security element during different stages of manufacturing.
  • the upper lines of the figure show the view of the security element before applying the color layers 9 and 22.
  • the middle lines show the views after application of the color layers 9 and 22, but before the modification by the radiation.
  • the bottom lines show the completed security element.
  • the left columns show the views that result from normal top view of the security element.
  • the middle columns show the respective see-through image and the right columns show the luminescence image after excitation with UV radiation.
  • a vertical bar is used for the brightness of the background of the respective images, with increasing baring indicating a decreasing brightness.
  • a vertical hatch denotes the brightness of elements in the see-through image.
  • Crosshatching denotes the brightness of elements in the supervisory image.
  • a vertical hatch denotes the brightness of structures in the luminescence image.
  • the hatching or hatching distance symbolizes the brightness.
  • a wider-meshed hatching or stroke therefore illustrates a lighter structural element, a closer meshing or brightness a darker element.
  • Dashed lines illustrate an area over which the particular radiation is applied. They are not visible in the views, but only entered to clarify the application of the laser radiation.
  • FIG. 6 shows a first embodiment of the manufacturing method of a security element with Passer between printing element and watermark.
  • Figure 23 shows the security element before applying the pressure element in supervision.
  • a white surface 32 can be seen.
  • Figure 24 shows the same manufacturing status in review.
  • the watermark which is formed by a horizontal bright rectangle 37 and a darker rectangle 36 in contrast, stands out. Both rectangles 37 are lighter than the gray area 33.
  • FIG. 25 shows the fluorescence image which is a black area 34 due to fluorescence colorant not yet present in this production status. It is assumed here that the substrate of the security element does not fluoresce.
  • FIGS. 26 to 28 again show in plan view (FIG. 26), review (FIG. 27) and fluorescence view (FIG. 28) the state of the security element after application of a printed image 38.
  • the printing element has a metallic silver pigment which is a remittant colorant.
  • Next has the printing element is a fluorescent ink layer 22 having a luminescent colorant and built up under an overlying ink layer containing the remitter colorant.
  • the colorants may alternatively (not shown) also lie in a common color layer.
  • the printed image 38 is highlighted in black in front of the white surface 32.
  • an irradiated area 60 is still marked by a dashed line. This is the area where laser radiation will subsequently be applied.
  • the watermark consisting of the standing rectangle 36 and the lying rectangle 37, in front of the gray area 33, covered by a black ellipse 49, which is formed by the printed image 38, is shown looking through this production stage.
  • the image 28 against a black background by the black surface 34 a darkened fluorescence image 39, which is due to the fact that the underlying fluorescent ink layer 22 is covered by the overlying ink layer 9 and only to a very small extent fluorescence radiation to the Surface penetrates.
  • FIGS. 29 to 31 show plan, transparent and fluorescence images after application of the laser radiation in the irradiated region 60, wherein the watermark is used as an intensity mask, as shown in FIG Fig. 1 to 5 previously explained.
  • the watermark consisting of the rectangles 36 and 37, acts as an intensity mask.
  • a maximum radiation intensity reaches the printed image 38 in the area of the horizontal rectangle 37 and a minimum intensity in the region of the background.
  • the printed image 38 with a mean intensity, which lies between the two extreme values applied.
  • the printed image 48 is structured into three regions which lie in the perfect register with the watermark 5.
  • An unchanged section 42 lies in those areas of the printed image 38 which do not cover the watermark, that is to say are illuminated by the radiation with the minimum intensity.
  • a gray portion 40 lies in the areas of the printed image 38, which cover the standing rectangle 36.
  • a bright section 41 is finally formed by those areas of the printed image 38 which cover the horizontal rectangle 37. This breakdown and patterning of the print image 38 is clearly visible in the image 27, which shows the top view of the finished structured security element.
  • the structured printing element 38 has an effect in superposition with the intensity modulation by the watermark, namely the rectangles 36 and 37.
  • the unchanged section 42 of the supervisory image leads to a black area 45 in the see-through image, since there the translucency of the security element is still completely reduced by the unchanged layer structure of the printed image 38.
  • a bright area 44 which corresponds to the bright portion 41, a brightness of the see-through image is established, which is reduced in relation to that of the horizontal rectangle 37. This reduction is caused by the small residual thickness of the visible layer absorbing layer structure of the printed image 38.
  • a dark area 43 is formed corresponding to the gray portion 40.
  • the translucency is reduced compared to that of the standing rectangle 36, but not as strong as in the black area 45.
  • Fig. 7 shows a development of the manufacturing process in a view similar to the Fig. 6 , Identical elements are provided with the same reference numerals.
  • the main difference to the embodiment of Fig. 6 is that the irradiated area 60 has a recess 61 in which the particular radiation is not applied. This is indicated by dashed lines in Figure 26.
  • the recess 61 causes a further unaltered portion 50 is formed according to the contours of the recess 61 in the supervisory image 29. Also in the transparency 30 is obtained in this way another black area 51 with the same dimensions. In fluorescence image 31, another darkened region 52 results, also with the same dimensions and outlines. In this way it is possible to provide a first additional pattern in the security element.
  • Fig. 8 shows a further modification, wherein irradiated in the irradiated area 60, in the example diamond-shaped spot 62, with additional radiation, which is designed so that it also removes the fluorescent color 22 now.
  • a diamond-shaped surface 53 is obtained in which no printed image 38 is present.
  • the diamond-shaped area 53 is provided with the dashed line of the background white area 32, usually a banknote paper.
  • the rhombic surface 53 may, however, due to the original printing in their gloss of the Background different, so that the diamond-shaped surface 53 in an oblique view shows a different gloss than the background of the white area 32nd
  • the diamond-shaped surface is divided into two triangular parts 54, 55, since the spot 62 covers the two rectangles 36, 37, which have different transmissions.
  • the two triangular parts 54 and 55 each have in the see-through image the brightness of the standing behind standing rectangle 36 or 37. This is determined by the location of the spot 62. Another location of the spot 62 results in a different or no division in the see-through image.
  • a rhombic surface 56 also appears where the fluorescent color layer 22 has been removed.
  • the fluorescence intensity of the background ie a black surface, is present.
  • Fig. 9 shows a further embodiment, which as a result of the Fig. 8 comes very close.
  • a spot 62 is irradiated with additional laser radiation, but it is provided during application of the print image 38, a pressure recess 63.
  • the supervisory image 29 also shows a representation which, when viewed vertically, is essentially that of the supervisory image of the Fig. 8 equivalent.
  • the gloss level ie the impression on oblique viewing in the diamond-shaped surface 59, is no different than in the background, ie in the white surface 32.
  • the exemplary embodiments presented above provide a two-level watermark with the rectangles 36, 37. This was chosen because of the clarity of the description. Of course, a single-level watermark and a multi-level or even an opacity continuously varying watermark may be used. The described principles apply equally.
  • the print motif is applied with at least one printing ink which has at least the following substances: Laser markable (IRA), preferably metallic pigments and UV-transparent, visibly luminescent, IR transparent pigments (preferably in the range 1000 nm to 1100 nm). IR transparent pigments and / or colorants may also be included, among others. In this case, the luminescence of excitable under UV radiation pigments by the z. B. weakened metallic pigments.
  • IRA Laser markable
  • IR transparent pigments preferably in the range 1000 nm to 1100 nm.
  • IR transparent pigments and / or colorants may also be included, among others.
  • the print motif is at least partially printed over the watermark, preferably on the substrate screen side (rougher than the felt side).
  • the print motif can consist of a closed surface and / or additional ornaments and / or be screened.
  • the laser should be adjusted so that the full thickness of the paper (outside the watermark area) will not cause any marking or ablation. At the same time, it must be ensured that the contrast in the sub-region modulated by the laser through the opposite substrate side over the watermark is to be kept as high as possible.
  • the area to be marked with the laser must be selected so that the tolerances between printing and laser marking are maintained.
  • the size of the surface results from the desired machine speed, but may not be less than 1.5 cm 2 in the rule.
  • the entire pigment is destroyed in the present case, whereas in pulsed operation only the optical properties of a metallic pigment are changed due to non-linear effects, for example, bonds are broken, so that the color effect emanating from the unmodified metallic pigment is changed or fails.
  • the following laser parameters are possible: 10 W maximum power in continuous wave mode, 30 kHz to 50 kHz pulse frequency, 5 ns to 50 ns, preferably 8 ns to 15 ns pulse length, 0.2 mm to 0.8 mm spot diameter (depending on the area to be exposed or Machine speed), 100 W maximum total energy (typically 50 W for silver pigments).
  • the pigments luminescent under UV radiation are simultaneously "exposed".
  • the part of the watermark marked by the laser is visible under UV radiation as a modulated motif, the non-marked areas also luminescing weakly and complementing the motif.
  • this motif is also recognizable under visual light as a modulated motif, which preferably has a metallic effect. This motif is perfectly matched with the watermark in the review.
  • a preferably alphanumeric motif is left out negatively (first motif, not marked).
  • first motif the luminescence power of the pigments which can be excited under UV radiation continues to be weakened by the non-ablated metallic pigments and thus the first motif remains recognizable under UV light.
  • this first motif is also recognizable under visual light as an alphanumeric motif, which has the full metallic effect. This first motif becomes visible through the comparatively higher opacity - appears darker than its surroundings.
  • a preferably alphanumeric motif is marked in cw mode (second motif, cw laser marking).
  • second motif a preferably alphanumeric motif
  • the second motif is recognizable under UV light as a black or dark motif (non-luminous)
  • the second motif remains invisible.
  • the second motif can be recognized as a latent motif (no color difference, only gloss difference). This second motif is not visible in the review, since the opacity of the color (lasered in pulse mode compared to the cw mode) has not changed.
  • the particular radiation is to be chosen so that the substrate as little or no absorption of the radiation occurs, which would lead to a change in the substrate.
  • Both continuous wave lasers and pulsed lasers are possible for this purpose.
  • An example of a suitable one Continuous wave laser is the model Innoslab, IS8I-E of the manufacturer Edge-Wave GmbH, which is a Nd: YVO 4 -based laser at a wavelength of 1,064 nm. It provides a power of 100 watts in continuous wave mode. At a scan speed of 2.5 m / s to 5 m / s, the ablation of a soot-based color can be performed.
  • Transmitted light in the sense of this invention is when the substrate is illuminated from the side opposite to the viewer, i. the illumination through the substrate takes place. Incident light is in the sense of this invention, when a lighting of the substrate from the side of the viewer is made.
  • the watermark may be a multi-level modulated 3D, a two-level highlight, or a high resolution pixel watermark that modulates the opacity of the substrate by thickness variation.
  • a combination of the different types of watermarks is also possible, especially if the main watermark motif is a portrait that can not be overprinted.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Optics & Photonics (AREA)
  • Printing Methods (AREA)
  • Credit Cards Or The Like (AREA)

Claims (10)

  1. Procédé de fabrication d'un élément de sécurité (1), selon lequel
    - un substrat (2) est fourni, lequel comprend un côté avant ainsi qu'un côté arrière (3, 4), est translucide au moins pour un rayonnement (10) donné et possède un filigrane (5) qui module l'opacité du substrat (2),
    - un élément d'impression (9) est appliqué sur le côté avant (3), lequel recouvre au moins partiellement le filigrane (5) et contient au moins un premier et un deuxième colorant, le premier colorant pouvant être ablati au moyen du premier rayonnement (10) défini et le deuxième pas, et
    - le substrat (2) est traversé depuis le côté arrière (4) par le rayonnement (10) donné et le premier colorant est ablati par le rayonnement (10) donné, le filigrane (5) étant utilisé comme masque servant à atténuer l'intensité du rayonnement donné afin de modifier l'élément d'impression (9) en concordance avec le filigrane (5),
    caractérisé en ce que
    - le premier colorant est un colorant réémetteur ayant un effet de couleur et il est disposé dans une première couche d'encre (9) et le deuxième colorant est un colorant luminescent et il est disposé dans une deuxième couche d'encre (22),
    - la première couche d'encre (9) recouvre la deuxième (22) et
    - le deuxième colorant est exposé à certains endroits (46) en modifiant le premier colorant du point de vue de l'effet de couleur ou en l'enlevant de la première couche d'encre (9) par le premier rayonnement (10) défini en utilisant le filigrane (5) comme masque.
  2. Procédé de fabrication d'un élément de sécurité (1), selon lequel
    - un substrat (2) est fourni, lequel comprend un côté avant ainsi qu'un côté arrière (3, 4), est translucide au moins pour un rayonnement (10) donné et possède un filigrane (5) qui module l'opacité du substrat (2),
    - un élément d'impression (9) est appliqué sur le côté avant (3), lequel recouvre au moins partiellement le filigrane (5) et contient au moins un premier et un deuxième colorant, le premier colorant pouvant être ablati au moyen du premier rayonnement (10) défini et le deuxième pas, et
    - le substrat (2) est traversé depuis le côté arrière (4) par le rayonnement (10) donné et le premier colorant est ablati par le rayonnement (10) donné, le filigrane (5) étant utilisé comme masque servant à atténuer l'intensité du rayonnement donné afin de modifier l'élément d'impression (9) en concordance avec le filigrane (5),
    caractérisé en ce que
    - le premier colorant est un colorant réémetteur ayant un effet de couleur et le deuxième colorant est un colorant luminescent,
    - le premier colorant et le deuxième colorant sont disposés dans une couche d'encre (64) commune,
    - le deuxième colorant est exposé à certains endroits (46) en modifiant le premier colorant du point de vue de son effet de couleur ou en l'enlevant de la première couche d'encre par le premier rayonnement (10) défini en utilisant le filigrane (5) comme masque.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le premier rayonnement (10) défini est structuré ou modulé de telle sorte qu'un premier modèle supplémentaire (50) est évidé, dans lequel le premier colorant n'est pas modifié ou retiré.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que le deuxième colorant peut être ablati ou modifié du point de vue de son effet de couleur au moyen d'un rayonnement supplémentaire et le deuxième colorant est ablati/modifié selon un deuxième modèle supplémentaire à des portions des endroits exposés par exposition au rayonnement supplémentaire (22).
  5. Procédé selon la revendication 4, caractérisé en ce que le rayonnement (10) défini est un rayonnement laser pulsé et le rayonnement supplémentaire est un rayonnement laser à onde entretenue, de préférence du même laser.
  6. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'élément d'impression (9) est appliqué de telle sorte qu'il présente au-dessus du filigrane (5) un évidement (56) selon un troisième modèle supplémentaire.
  7. Procédé selon l'une des revendications précédentes, caractérisé en ce que le colorant réémetteur possède des pigments métalliques, des pigments colorés à effet ou des pigments à décalage de couleur.
  8. Procédé selon l'une des revendications précédentes, caractérisé en ce que le deuxième colorant luminescent possède des pigments qui sont transparents dans la plage spectrale des IR, de préférence dans la plage spectrale de 1000 nm à 1100 nm.
  9. Procédé selon l'une des revendications précédentes, caractérisé en ce que le premier colorant est retiré par son ablation.
  10. Procédé selon l'une des revendications 1 à 9, caractérisé en ce que l'élément d'impression comprend un revêtement, un film de transfert, un film stratifié et/ou un fil à fenêtre.
EP16716473.0A 2015-04-21 2016-04-11 Procédé servant à fabriquer un élément de sécurité avec un alignement entre un élément d'impression et un filigrane Active EP3286010B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015005083.4A DE102015005083A1 (de) 2015-04-21 2015-04-21 Verfahren zum Herstellen eines Sicherheitselementes mit Passer zwischen Druckelement und Wasserzeichen
PCT/EP2016/000598 WO2016169640A1 (fr) 2015-04-21 2016-04-11 Procédé servant à fabriquer un élément de sécurité avec un alignement entre un élément d'impression et un filigrane

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EP3286010A1 EP3286010A1 (fr) 2018-02-28
EP3286010B1 true EP3286010B1 (fr) 2019-06-19

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EP (1) EP3286010B1 (fr)
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Publication number Priority date Publication date Assignee Title
FR2891766A1 (fr) * 2005-10-11 2007-04-13 Gemplus Sa Procede de realisation d'une impression et/ou personnalisation graphique infalsifiable sur un support et support obtenu
DE102008063471A1 (de) * 2008-12-17 2010-07-01 Giesecke & Devrient Gmbh Sicherheitselement mit Wasserzeichen
DE102009056462A1 (de) 2009-12-01 2011-06-09 Giesecke & Devrient Gmbh Durchsichts-Sicherheitsmerkmal
DE102012003601A1 (de) 2012-02-21 2013-08-22 Giesecke & Devrient Gmbh Druckverfahren mit Passer zwischen Druck und Wasserzeichen

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* Cited by examiner, † Cited by third party
Title
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EP3286010A1 (fr) 2018-02-28
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