EP1904312A2 - Data carrier and method for the production thereof - Google Patents
Data carrier and method for the production thereofInfo
- Publication number
- EP1904312A2 EP1904312A2 EP06753761A EP06753761A EP1904312A2 EP 1904312 A2 EP1904312 A2 EP 1904312A2 EP 06753761 A EP06753761 A EP 06753761A EP 06753761 A EP06753761 A EP 06753761A EP 1904312 A2 EP1904312 A2 EP 1904312A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- laser
- layer
- data carrier
- printing
- laser radiation
- 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 description 42
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 230000005855 radiation Effects 0.000 claims abstract description 73
- 239000000758 substrate Substances 0.000 claims abstract description 66
- 239000011248 coating agent Substances 0.000 claims abstract description 22
- 238000000576 coating method Methods 0.000 claims abstract description 22
- 239000010410 layer Substances 0.000 claims description 147
- 238000007639 printing Methods 0.000 claims description 80
- 230000002745 absorbent Effects 0.000 claims description 41
- 239000002250 absorbent Substances 0.000 claims description 41
- 239000000203 mixture Substances 0.000 claims description 41
- 230000009471 action Effects 0.000 claims description 6
- 238000007650 screen-printing Methods 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 238000004049 embossing Methods 0.000 claims description 5
- 238000001228 spectrum Methods 0.000 claims description 5
- 238000003490 calendering Methods 0.000 claims description 4
- 239000000969 carrier Substances 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 4
- 230000036961 partial effect Effects 0.000 claims description 4
- 239000011241 protective layer Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 238000000605 extraction Methods 0.000 claims description 3
- 238000007646 gravure printing Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 3
- 229920000742 Cotton Polymers 0.000 claims description 2
- 239000007888 film coating Substances 0.000 claims 1
- 238000009501 film coating Methods 0.000 claims 1
- 239000002985 plastic film Substances 0.000 claims 1
- 229920006255 plastic film Polymers 0.000 claims 1
- 230000000694 effects Effects 0.000 description 15
- 239000000976 ink Substances 0.000 description 15
- 238000010521 absorption reaction Methods 0.000 description 12
- 238000002372 labelling Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 11
- 230000008901 benefit Effects 0.000 description 8
- 230000008859 change Effects 0.000 description 8
- 230000003287 optical effect Effects 0.000 description 8
- 239000000049 pigment Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 238000013461 design Methods 0.000 description 6
- 239000003086 colorant Substances 0.000 description 4
- 238000010330 laser marking Methods 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000002932 luster Substances 0.000 description 2
- 239000003550 marker Substances 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000287107 Passer Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
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- 238000009281 ultraviolet germicidal irradiation Methods 0.000 description 1
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
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/10—Intaglio printing ; Gravure printing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
- B41J2/44—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using single radiation source per colour, e.g. lighting beams or shutter arrangements
- B41J2/442—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using single radiation source per colour, e.g. lighting beams or shutter arrangements using lasers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
- B41J2/47—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using the combination of scanning and modulation of light
- B41J2/471—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using the combination of scanning and modulation of light using dot sequential main scanning by means of a light deflector, e.g. a rotating polygonal mirror
-
- 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
-
- 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
-
- 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
- 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
- B41M5/267—Marking of plastic artifacts, e.g. with laser
-
- 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
- B41M5/28—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using thermochromic compounds or layers containing liquid crystals, microcapsules, bleachable dyes or heat- decomposable compounds, e.g. gas- liberating
Definitions
- the invention relates to a data carrier, in particular a valuable document or a security paper, with a substrate and a coating applied to the substrate, in which by the action of laser radiation markings in the form of patterns, letters, numbers or images are introduced.
- the invention also relates to a method and a device for producing such a data carrier.
- Security documents such as banknotes, stocks, bonds, certificates, vouchers, checks, tickets and the like, are usually provided with an individualizing identifier, such as a serial number. To increase safety, this number plate is often applied several times to the value document. For example, banknotes are double-dotted so that each banknote half is uniquely identifiable. The two numbers are usually the same.
- Identity cards have long been provided with laser marking with an individual identification.
- marking by laser engraving the optical properties of the card material in the form of a desired marking are irreversibly changed by suitable guidance of a laser beam.
- the publication DE 3048 733 A1 describes an identification card with applied information which has different colored layer areas arranged one above the other on a surface and which are at least partially interrupted by visually recognizable personalization data.
- the present invention seeks to propose a data carrier of the type mentioned, which can be provided in a simple manner with an individual identification with high security against counterfeiting.
- the label should take up little space on the disk and can be easily integrated into existing designs or print images.
- the substrate is pressed during or after the application of the at least partially permeable layer
- e is applied to the applied coating with laser radiation of the selected laser radiation spectrum to produce the visually recognizable markings at least in the absorbent layer.
- the high pressure of compressing the substrate provides a particularly good bond between the at least partially transparent ink and the substrate so that the absorbent layer can be removed in the subsequent labeling step e). without destroying the partially transparent print layer.
- the individual marking can thus, as usual and expedient, only be used at the end of the time required for the production of the data carrier. be introduced different pressure passages.
- the appearance of the viewer appears to the observer as if the marking had already been introduced in a work step at the beginning of the production chain. This allows designs with a visually appealing overall impression and leads to a high security against counterfeiting, since such an individual marking can not be adjusted by a subsequently applied printing layer.
- the at least partly permeable layer is applied in step c) by intaglio printing and the substrate is pressed in the process.
- the substrate is blind-embossed after the application of the absorbent layer and the at least partially permeable layer.
- Another preferred way to compress the printed substrate is to subject the substrate to a calendering step after the application of the absorbent and the at least partially permeable layer.
- the at least partly permeable layer in step c) is advantageously printed in the form of fine structures, in particular in the form of guilloches, microtext, graphic elements or the like.
- the absorbent layer is preferably printed in step b) and is particularly preferably printed by screen printing, for example with a metallic effect color, such as a silver or gold color.
- a coated or uncoated film can also be applied as an absorbing layer.
- a coated film a colored, even at the selected laser wavelength non-absorbing Foil, which is provided with a thin metal layer, such as a vapor-deposited aluminum layer.
- the absorbent layer in step b) can also be applied in subregions with different printing methods or printing parameters, so that the subregions are influenced differently by the laser radiation during laser application in step e).
- a first portion of the absorbent layer can be imprinted in intaglio and a second portion in the Nylloprint process.
- the second subregion is then removed together with the underlying absorbent layer, while the first subregion remains through the crimping.
- the laser parameters in step e) can be selected such that the at least partially transparent layer remains completely intact during the laser application.
- embossings in particular embossings obtained without ink guide, can be obtained by a suitable choice of the laser parameters in the application in step e), whereby the safety of the overall element is further increased.
- the laser parameters may also be varied during the exposure in step e) to partially allow the embossments in the coating to be partially removed.
- the application of laser radiation in step e) is advantageously carried out from the front side of the substrate, ie from the substrate side, on which the absorbing layer and the partially permeable layer are applied.
- the absorbent layer and the at least partially permeable layer can be applied to each other completely or partially overlapping. Before and / or after the application of laser radiation, a protective layer can furthermore be applied.
- the selection of the laser radiation spectrum in step a) is typically carried out by selecting a suitable laser wavelength.
- a suitable laser wavelength As the laser source, an infrared laser in the wavelength range of 0.8 ⁇ m to 3 ⁇ m, in particular a Nd: YAG laser, is advantageously used for the identification in step e).
- the laser beam is expediently guided over the substrate during the application at a speed of more than 1 m / s, preferably of more than 4 m / s, particularly preferably of more than 10 m / s, in order to achieve the high processing speeds in securities printing Take into account.
- the invention also includes a data carrier of the type mentioned above, the coating containing a laser radiation absorbing layer and disposed over the absorbent layer, for the laser radiation at least partially transmissive print layer and wherein the printed substrate during or after the printing of the at least partially permeable layer is compressed.
- the at least partially transparent layer is formed by a gravure printing layer.
- the at least partially permeable layer contains a color mixture which has a mixture component which absorbs the laser radiation and a mixture component which is transparent for the laser radiation.
- the absorbing mixture component may for example be bleached, vaporized, changed in its reflection properties or converted by a chemical reaction into a material having different optical properties. But it is also possible that the absorbing mixture component undergoes no recognizable changes to the naked eye when exposed to laser radiation.
- the color mixture preferably contains optically variable color pigments, in particular optically variable liquid-crystal pigments or a transparent intaglio printing ink, and, for example, optically variable interference-layer pigments for the absorbing mixture component.
- color components which are irreversible in their optical properties, such as an intaglio printing ink, a metallic effect ink or metallic pigments, a luminescent color or luminescent pigments, luster pigments or a thermochromic color, are also suitable for the absorbing mixture component.
- the labeling in step e) does not change the optical properties of the absorbent mixture component, but that the color mixture contains a color component which interacts with the absorbent mixture component and indirectly effects its optical properties, namely through the absorption of the laser radiation the absorbing mixture component, in particular the local temperature deviation caused thereby in the coating, are irreversibly changed.
- the color mixture contains, for example, carbon black, graphite, ⁇ O 2 or an infrared absorber.
- the at least partially permeable layer is preferably printed in the form of fine structures, in particular in the form of guilloches, microtext, graphic elements or the like.
- the absorbent layer is expediently designed as a solid surface. It may in particular be formed by a printing layer, for example a screen printing layer or by a coated or uncoated film.
- the absorbing layer contains a color mixture which, in the manner described above, has a mixture component absorbing the laser radiation and a mixture component transparent to the laser radiation.
- the coating has optically variable properties. It may also contain one or more protective layers applied before or after the laser application.
- the absorbent layer and the at least partially transmissive layer may completely or partially overlap one another in all embodiments.
- the coating can contain a further layer which is at least partially permeable to the laser radiation and which is exposed by the marking in method step e).
- the further layer can contain, for example, visually recognizable features in the region of the markings, by certain viewing conditions, such as UV illumination, activatable features and / or machine-readable features.
- the substrate of the data carrier may be a paper substrate, such as a cotton paper, or a plastic substrate, such as a PET or PP film.
- the data carrier represents a security element, a banknote, a document of value, a passport, an identity card, a document or another product protection means.
- the invention also includes a printing machine with a laser system for carrying out the method described above.
- the laser system is arranged over a printing cylinder of the printing press to pressurize the data carrier to be marked on the printing cylinder with laser radiation.
- the laser system is designed for the vibrations occurring in the printing press during printing. This can be done, for example, by designing the laser system with a supporting frame, which is designed according to a finite element method analysis of the vibrations that occur so that the laser system also carries out the vibrations of the printing press without being rocked.
- the laser system advantageously contains at least one identification laser with a horizontally arranged laser resonator, which is connected via a beam tube to a scan head for deflecting the laser beam.
- the laser system contains more than one marking laser, for example 2, 4 or 6 marking lasers.
- the laser system is vertically movable between one or more working positions for laser exposure of the data carrier and a maintenance position, wherein the printing cylinder and subsequent inking units of the printing press are accessible in the maintenance position.
- the laser system further advantageously has a Abschirrnkarnmer arranged directly above the printing cylinder, which shields the laser radiation and is designed for the extraction of the gases and dusts resulting from the marking.
- FIG. 1 is a schematic representation of a marked bill according to an embodiment of the invention
- FIG. 2 shows a cross section through the banknote of FIG. 1 along the line II-II in the region of the marking
- 3 is a plan view of the marking of a banknote according to another embodiment of the invention
- 4 is a plan view of the marking of a banknote according to a further embodiment of the invention
- FIG. 5 shows a cross section through the banknote of FIG. 4 along the line V-V in the region of the marking
- 6 and 7 is a plan view and a cross section through a document of value according to another embodiment of the invention.
- FIG. 11 is a schematic representation of a Vektorlaserbeschrifters for labeling according to the invention of data carriers
- Fig. 13 is a schematic view of a printing machine, which is provided with a laser system according to the invention for the identification of banknotes and the like, and
- Fig. 14 the laser system of Fig. 13 in cross section.
- FIG. 1 shows a schematic representation of a banknote 10, on whose front side a coating 12 is applied, in which by the action of an infrared laser beam a 4, in the embodiment in the form of the number sequence "1234.”
- Fig. 2 shows a cross section through the banknote 10 along the line II-II of Fig. 1 in the region of the marking 14th
- the coating 12 applied to the paper substrate 20 of the banknote 10 contains two partial layers: a first layer 22 which absorbs the laser radiation of the infrared laser used for identification and a second layer 24 which is used for the one Laser radiation is transparent.
- the laser radiation incident from the front side of the substrate passes through the transparent second layer 24 and generates the marking 14 in the absorbing first layer 22.
- the absorbing layer 22 can be locally bleached, evaporated, for example their reflection or absorption properties changed or converted by a chemical reaction in a material with different optical properties.
- the second, transparent layer 24 also remains in the area of the characteristic drawing 14. This is inventively achieved in that the substrate 20 is compressed during or after the printing of the second layer 24. As a result of the pressure occurring in the present case, a particularly stable connection of printing layer 24 and substrate 20 is produced, which makes it possible to introduce a marking into the absorbing layer 22 without destroying the transparent layer 24.
- the pressing of the substrate is achieved in the embodiment of Figures 1 and 2, characterized in that the transparent layer 24 imprinted by intaglio printing with a high pressure of, for example, 50,000 kPa becomes.
- the Stichtief printing technique allows a relatively thick application of paint compared to other common printing techniques.
- the thick ink layer 24 together with the partial deformation 26 of the paper surface which comes about when the paper is pressed into the engraving of the printing plate, can easily be felt manually even by the layman and thus can easily be recognized as an authenticity feature by virtue of its tactility.
- FIG. 3 shows a plan view of a banknote 30 designed according to the invention.
- an Nd: Y AG laser with a wavelength of 1.064 ⁇ m is used, as described in detail below.
- a silver-colored effect ink layer 32 in the form of a coin is first applied to the banknote substrate by screen printing over the entire surface.
- the effect color layer 32 forms the layer absorbing the selected infrared laser radiation.
- a portrait 34 which is shown only diagrammatically in FIG. 3, is then blind embossed in the effect color layer with a gravure printing plate, and a guilloche-shaped edge pattern 36 is imprinted in intaglio printing.
- the marking area is then lasered from the printed side of the banknote 30 and a desired marking 38, for example in the form of a serial number or another individualizing identifier, is produced in the effect layer 32.
- the marking 38 is shown schematically as a numerical sequence "12345.” Due to its high absorption, the silver effect color 32 is completely removed in the irradiated region 38, so that the marking emerges in high contrast and especially in transmitted light in a high contrast. Furthermore, in the areas 38, the intaglio printing ink of the edge pattern 36 lying above the effect layer 32 and transparent to the laser radiation can be recognized, which was not destroyed due to the good connection of printing ink and paper during laser application.
- FIG. 4 shows a plan view of a detail of a banknote according to the invention
- Fig. 5 shows a section along the line V-V of Fig. 4 in the region of the label.
- a colored line-shaped imprint 42 which is transparent to the laser radiation used for marking, is first applied to the paper substrate 40 of the banknote.
- This print can be printed, for example, in the nyloprint process.
- the imprint 42 is overprinted with an effect color layer 44 which absorbs the selected laser wavelength.
- the printed substrate is printed with an engraving ink 46 which is transparent to the laser radiation and at the same time compressed.
- the layer sequence is printed from the printed side with laser radiation of a previously selected wave length, for example 1.064 ⁇ m, in order to introduce the desired marking 48, represented in the exemplary embodiment by the number sequence "1234."
- the absorbing effect color layer 44 is locally removed by the action of the laser radiation, so that the laser radiation below and from the laser radiation
- the intaglio printing ink 46 is likewise transparent to the laser radiation and, owing to the good adhesion to the paper achieved by the pressing, is also retained in the lasered areas 48, resulting in an image impression as shown in FIG.
- the imprint 42 can also be executed, for example, in iris printing, the color transition of which is exposed in the marking areas.
- the imprint may also include features that are invisible to the naked eye and are only activated and / or visualized by certain lighting conditions, such as UV irradiation. Other, in particular machine-readable features can also be provided.
- the absorbent layer 22 or 44 of the embodiments of FIGS. 2 or 5 may also be implemented in iris printing, with two colors being suitably used for the iris printing which differ in their absorption behavior at the selected laser wavelength. In the labeling step, different appearances can then be generated for the two colors. The two colors used may appear to be the same color in the visible spectral range and differ only by their infrared absorption at laser wavelength.
- a color section may be used for the at least partially permeable layer 24 or 46 in the steel pass. which is invisible to the human eye but results in different absorption at the IR laser wavelength.
- the partially transmissive layer can thus be removed in subregions with high IR absorption, while remaining in subregions with low IR absorption.
- FIGS. 6 and 7 show a further embodiment of the invention, in which instead of a transparent layer, an only partially permeable layer is printed, which also partially absorbs the laser radiation.
- FIG. 6 shows a plan view
- FIG. 7 shows a cross section through a value document according to the invention.
- the embossing of the layers by the intaglio printing, as indicated in FIGS. 2 and 5, is no longer shown in the following figures for the sake of simplicity, even if intaglio printing processes are used.
- a laser radiation absorbing layer 52 for example a full-area silver-colored screen printing layer
- a laser radiation partially transparent marking layer 54 in the form of a fine line pattern.
- the marking layer 54 consists of a color mixture of two mixture components 56 and 58, wherein one of the mixture components 56 is transparent to the radiation of the infrared laser used subsequently to the marking, while the other mixture component 58 absorbs the laser radiation.
- the color mixture consists of a bright, for the laser beam Transparent base paint 56, the absorbent soot particles 58 are mixed.
- the marking layer 54 was irradiated with the marking laser with suitably selected laser parameters, whereby the absorbing mixture component 58 was removed, changed or deactivated by the action of the laser radiation.
- the absorbent mixture component 58 is, for example, bleached, evaporated, changed in its reflection properties or converted by a chemical reaction into a material having other optical properties, so that the optical properties of the color mixture in the region 60 irreversibly changed by the irradiation become.
- Possible effects include, inter alia, a color change, the generation of a color change, the lightening of a color, the change in the tilt of an effect color mixture or the local change in the polarization properties or the luminescence properties of the marking layer 54.
- the soot particles 58 are removed from the color mixture when exposed to laser radiation, so that only the light color 56 remains in the irradiated area 60, as can be seen in the plan view of FIG.
- the laser radiation in the region 60 passes through the partially transmissive layer 54 and also produces a visually perceptible change in the absorbing layer 52, as described above.
- the marking 60 which in the exemplary embodiment is represented as a number sequence "12" is written in register in the two layers 52 and 54. Since the line pattern formed by the marking layer 54 was printed in a single work step, the bright pattern parts and dark ones stand Sample parts within or outside of the label 60 in perfect register with each other. In this way creates a passers situation that can not be adjusted with conventional methods.
- an absorbent marking layer 72 is printed on a substrate 70, which is a color mixture of two mixture components 74 and 76 of the type just described.
- a layer 78 transparent to the laser radiation is printed via this marking layer, which layer can be printed, for example, by intaglio printing, as described above.
- the substrate may be subjected to a calendering step to compress the printed substrate.
- the absorbent mixture component 76 is removed from the marking layer 72, changed or deactivated, and thus introduced the marking in the coating.
- the transparent layer 78 also remains in the loaded region 80 due to the good adhesion between ink and paper.
- FIG. 9 shows a banknote 90 according to a further exemplary embodiment of the invention.
- the absorbent layer 92 is formed in this embodiment by a colored film 94 which is vapor-deposited with a thin aluminum layer 96.
- a layer 98 transparent to the laser radiation is again printed on the coated film, the printed substrate being pressed during or after this printing process.
- the banknote is subjected to infrared laser radiation in the desired regions 100, whereby the aluminum layer 96 is locally vaporized or vaporized a transparent modification is converted. Again, the transparent layer 98 is retained.
- FIG. 10 shows a configuration in which both the absorbent layer 110 and the partially permeable layer 120 are formed by a color mixture of two mixture components of the type described above and in each case a mixture component 112 or 122 transparent to the laser radiation absorbent blend components 114 and 124, respectively.
- the printed substrate is calendered and thereby pressed.
- the absorbent mixture components 114 and 124 of the two layers in the applied marking region 116 are removed, changed or deactivated, so that this region shows a mixed color which contrasts sharply with the surrounding color.
- Fig. 11 shows schematically the scan head 200 of a vector laser marker, with which a substrate 202 to be marked is provided with a serial number 204 or another individualizing marking.
- the substrate 202 may be an already finished value document, a sheet with multiple benefits of a value document, or a security paper in an endless form.
- An infrared laser beam 220 is generated in the laser resonator 222 between the rearview mirror and the output mirror and limited by a mode diaphragm 224 to a specific beam diameter and certain spatially distributed vibration states, the so-called modes.
- the decoupled beam 226 passes through a beam-widening telescope 228, passing as on Beam 206 extends the input aperture 212 of scanning head 200 and is deflected by two movable mirrors 208, one of the mirrors producing the deflection in the x direction and the other mirror producing the deflection in the y direction.
- a plan field lens 210 focuses the laser beam 206 onto the substrate 202, where it produces a mark in the applied coating in the manner described above.
- the beam expansion telescope 228 is used to ensure good beam focusability. The larger the widening, the better the focusability through the plan field lens 210 at the end of the
- Beam path However, larger expansion requires the use of larger scanner mirrors 208, which have greater inertia and thus result in slower beam deflection.
- the beam spread is preferably adjusted so that the beam waist in which the light beams are parallel is in the plane of the plan field lens 210, resulting in good focusability of the beam.
- Another adjustment option is to adjust the beam waist to the input aperture 212 of the scan head 200 to avoid losses at the edge of the beam pattern; this results in a higher beam intensity on the substrate 202.
- the plane-field lenses used typically have focal lengths between 100 and 420 mm, with a focal length of about 160 mm being currently preferred.
- the substrate 202 moves at a certain speed v during the marking process. This velocity is detected by sensors and transmitted to a computer to control the movement of the mirrors 208 to compensate for the substrate velocity v at the marking.
- This labeling process Therefore, it can be used particularly advantageously for the contactless identification of value documents, which are processed at high speeds, as usual in printing shops.
- the labeling field on the substrate 202 typically has the size of a banknote.
- the caption field may be formed by an ellipse having axis lengths of about 190 mm and about 140 mm.
- radiation sources may be C ⁇ 2 lasers, Nd: Y AG lasers or other types of lasers in the wavelength range from UV to far-infrared, the lasers often also advantageously having frequency doubling or triplication.
- laser sources in the near infrared and in particular Nd: YAG lasers with a fundamental wavelength of 1064 nm are preferably used, since this wavelength range fits well with the absorption properties of the substrates and printing inks used.
- the spot size of the laser radiation can be varied from a few micrometers to a few millimeters, for example by changing the distance between the field lens 210 and the substrate 202. In most cases, the spot size is on the order of 100 ⁇ m.
- the spot size can be selectively changed to produce fine markers with high energy density or wider markers with lower energy density.
- the beam widening 228 can be adjusted such that the beam waist lies in the plane of the plane field lens 210.
- the beam diameter must be in this case may be reduced by mode aperture 224 to prevent the edge of the beam image from reaching the edge of the input aperture. The total energy of the beam can thereby be reduced. Energy density and total energy in turn affect the nature and appearance of the markers.
- the scan head 200 can either be attached directly to the laser or the laser light is passed through a light guide or beam deflections to the scan head. Beam deflections are currently preferred because the power and beam quality losses are very low.
- the continuous power of the laser markers used is typically between a few watts and a few 100 watts.
- Nd: Y AG lasers can be operated with laser diodes for lower overall power with smaller dimensions and high beam quality, or with pump lamps for high outputs.
- the markings are advantageously carried out with very fast moving galvanometers, which can guide the beam over the substrate at more than 1 m / s, preferably at more than 4 m / s.
- Particularly preferred and especially suitable for effects that do not require a large total energy are speeds above 10 m / s. At these speeds, only a small proportion of energy is deposited per distance in the substrate or the coating, so that advantageously lamp-pumped Nd: Y AG lasers with a power of about 100 watts are used.
- Examples of typical labeling parameters and settings are: A mode aperture with an opening between 1 and 5 mm, preferably 2 mm; a beam spread that is between 3 and 9f, preferably 4.5 times; adjusting the focus of the beam-expanding telescope so as to obtain maximum power throughput at the input aperture of the scan head; a scan head designed for beam apertures between 7 and 15 mm, preferably about 10 mm; a field lens having a focal length between 100 and 420 mm, preferably about 163 mm; a working distance between lens and substrate, which is chosen so that a certain defocusing by a smaller beam distance, as it corresponds to the focal length arises; and pulse frequencies that are between 20 kHz and continuous operation.
- the labeling results can be varied within a wide range.
- the labeling parameters such as the laser power, exposure time, spot size, labeling speed, working mode of the laser, etc.
- the labeling results can be varied within a wide range.
- laser-shaped markings such as a lettering, or flat markings filled with a line pattern can be generated by the laser.
- the laser power is advantageously set to a value between 50 and 100 W, preferably about 80 W, and the travel speed of the laser beam to a value between 2 and 10 m / s, preferably about 7 m / s, set.
- the laser power is advantageously between 50 and 100 W, preferably about 95 W, and the travel speed of the laser beam is set at a value between 5 and 30 m / s, preferably at about 20 m / s. set.
- the line spacing of the individual lines forming the surface pattern is advantageously between 50 and 380 ⁇ m, more preferably between 180 and 250 ⁇ m.
- lasering from the rear side of the substrate is also possible. In this case, it is advantageous if the substrate 202 has the lowest possible absorption at the laser wavelength.
- the laser parameters can also be changed during the laser so that different effects result.
- the pulse repetition frequency can be changed during pulsed laser during the process so that the partially transparent layer is removed in certain areas.
- Banknotes or value carriers are usually printed in sheet form, but it is also possible to print on webs. In general, when printing on sheets, lower register variations can be achieved, which are on the order of +/- 1.5 mm.
- the individual notes also referred to below as individual benefits, are arranged in rows of benefits alongside each other.
- the laser marking devices are mounted so as to be associated with a row of use, as shown in FIG. 12.
- Fig. 12 shows a laser marker 230 in which a sheet 232 having a plurality of lasers is simultaneously provided with a laser mark and a laser modification area.
- the bend 232 has six columns and six rows, so that on this arc 36
- Single-use 234 are arranged on banknotes or other data carriers.
- the bow moves in the direction of the arrow.
- a laser tube 236 is arranged above the printed sheet 232, which, together with the associated scan head 238, respectively, are arranged in the individual slots arranged in this column 234 generates the laser marks or modifications.
- the throughput can be greatly increased, since not a single laser beam must be moved over the entire sheet, but only a movement in the boundaries of the columns of the sheet is required.
- the application of the individual benefits takes place, as described in FIG. 11, via the deflection of the laser radiation by means of mirrors contained in the scan heads 238.
- the typical speed of a sheet-fed press is 10,000 Bg / h. Depending on the embodiment, this corresponds to web speeds of 2 m / s to 3.3 m / s. These web speeds are also achieved when printing web-like materials. Since the laser marking process is to be adapted in its speed to the typical conditions of a printing line, the markings must be able to be made on substrates which move at the said speeds. The optionally made detection of the printed image must take place at these speeds.
- FIG. 13 shows a schematic view of a printing machine 250 which is provided with a laser system 270 according to the invention for marking notes and the like.
- the laser system 270 itself is shown in more detail in cross-section in FIG.
- the printing press 250 has a flaker feeder 252, a printing tower 254 with a stop drum 256 for receiving the sheets, a printing cylinder 258 and inking units 260, and a tray 262.
- the impression cylinder 258 has portions of the circumference which receive two sheets (black in Fig. 13) and breaks (white in Fig. 13).
- the paper feeder 252 may already have printed paper sheets which are only to be lasered and which pass through the printing machine 250 only for the introduction of the markings. Due to the design of the laser system 270 according to the invention, however, it is now also possible to both print and to load the paper sheets in the printing press 250.
- the printing process carried out together with the lasering may in particular be a numbering of already printed banknotesheets or a general printing step, for example an intaglio printing.
- the inventors have now found that the most accessible location for the laser is the printing cylinder 258.
- the sheets are laid one on top of the other, so that the next fed sheet is guided among the following.
- the sheets are "free fluttering", that is fixed only at the gripper edge, until they lie on the stack.
- the printing cylinder 258 also has the advantage of the cylindrical elements that the circumference is dimensioned for two sheets and therefore has the least curvature. The smaller the curvature, the lower the distortions that must be compensated, and the less the change in beam diameter due to the changing distance of the plan field lens 210 (FIG. 11) and the signature.
- a particular advantage of the construction of the laser system 270 is that the feeder 252 and the printing cylinder 258 with its paper guide and the subsequent inking units 260 remain accessible. As a result, conventional numerals, in particular also simultaneously with the laser, can be carried out with the printing press 250. An arrangement of the serstrom 270 above the feeder 252 is unfavorable for this reason.
- the resonator 222 and the scan head 200 of each of the lasers are spatially separated according to the invention, since the laser resonators 222 can not be tilted, but must be installed horizontally for a controlled flow of cooling water.
- mirrors or optical fibers can be used to guide the laser beam out of the resonator 222 into the scan head 200.
- optical fibers have the disadvantage that the beam quality deteriorates and power losses occur.
- the parameter range is limited because too strong pulses, as can occur in Q-switched pulse lasers, destroy the light guide.
- mirrors 272 are used, which are arranged at the corners of jet tubes 274.
- FIG. 14 only one laser is shown, but it should be understood that in practice several, for example, six lasers are arranged one after the other, as shown in FIG.
- the frame of the laser system 270 consists of a reinforced frame 276, which was designed according to a finite element method analysis of the vibrations occurring.
- the aim is that the laser with the simultaneous printing unavoidable vibrations of the printing machine 250 perform without being rocked.
- the frame 276 is mounted over the housing of the inking units 260 such that the cooling water conduits of the lasers point in the direction of the cantilever, and is attached to the screw threads for cranes for transporting the printing press 250, which provide a large force absorption.
- the frame 276 is formed in two parts, wherein in an outer frame, an inner frame is suspended.
- the outer frame can be rapidly reciprocated between a plurality of detent positions and an upper position by means of externally mounted gas springs (not shown).
- an awning crank and a winch can be used.
- the detent positions are assigned to the different possible focal lengths of the plane field lenses 210 and thus to the different working distances.
- the inner frame is finely adjustable, for example, by means of cranks in height and in angle, in order to allow an exact adjustment of the height of the plane field lens 210 and the direction of the radiation 206.
- the altitude can be displayed by scales and is therefore exactly reproducible. Due to the locking positions, this adjustment is not lost, for example, when working on the inking units 260, the laser should be moved back up and back.
- the resonators 222 are disposed on plates 278 which can be displaced together with the radiant tubes 274 to align the labeling units on the rows of benefits.
- a shielding chamber 280 is arranged, which shields the laser radiation and serves for the extraction of the resulting gases and dusts via pipes, not shown in the figure.
- the shielding chamber 280 is mounted so that its position is not changed at the different locking positions for the standard working distances; Only at the position for working on the inking unit 260 is it driven upwards.
- the shielding chamber 280 closes off to the impression cylinder 258 with laser light impermeable brushes and to the scan heads 200 by means of bellows 282.
- the laser is controlled by a sensor for detecting the sheet or pressure and by measuring the speed.
- the sheet edge sensor is a high-precision and fast reflection light scanner.
- the speed of the printing cylinder 258 is tapped off by means of periodically magnetized belts, which were introduced under the supports of the printing cylinder, by means of a magnetic pushbutton.
- the printing cylinder has yes parts of the circumference on which no bow comes to rest.
- the scan achieves a resolution of 25 ⁇ m.
- the assumption of a constant speed is not possible because the various simultaneous operations of the printing press 250 are typically driven by a central motor and therefore the sheet travel is subject to periodic variations.
- the reflection light switch signal is fed to a "trigger box", which controls the lasers, and can be programmed so that, for laser applications, the starting distance, as measured by the magnetic tapes, and the spacing of the sequential marks can each be entered independently from a computer program ,
- a blocking for further signals of the reflection light scanner can be determined either as a blocking distance or by a determination of the sheet position by the magnetic tapes. In this case, only after one end of the magnetic tape (and thus the end of the sheet) a start signal is allowed and blocked from a start signal until it reaches an end of the magnetic tape.
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Electromagnetism (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Business, Economics & Management (AREA)
- Accounting & Taxation (AREA)
- Finance (AREA)
- Printing Methods (AREA)
- Credit Cards Or The Like (AREA)
- Laminated Bodies (AREA)
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- Thermal Transfer Or Thermal Recording In General (AREA)
Abstract
Description
Claims
Priority Applications (1)
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PL06753761T PL1904312T3 (en) | 2005-06-01 | 2006-05-22 | Data carrier and method for the production thereof |
Applications Claiming Priority (2)
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DE102005025095A DE102005025095A1 (en) | 2005-06-01 | 2005-06-01 | Data carrier and method for its production |
PCT/EP2006/004819 WO2006128607A2 (en) | 2005-06-01 | 2006-05-22 | Data carrier and method for the production thereof |
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EP1904312A2 true EP1904312A2 (en) | 2008-04-02 |
EP1904312B1 EP1904312B1 (en) | 2013-07-17 |
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EP06753761.3A Revoked EP1904312B1 (en) | 2005-06-01 | 2006-05-22 | Data carrier and method for the production thereof |
Country Status (13)
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US (1) | US8875628B2 (en) |
EP (1) | EP1904312B1 (en) |
JP (1) | JP2008542070A (en) |
CN (1) | CN101184632B (en) |
AU (1) | AU2006254436B2 (en) |
BR (1) | BRPI0613317A2 (en) |
CA (1) | CA2607980A1 (en) |
DE (1) | DE102005025095A1 (en) |
MX (1) | MX2007015133A (en) |
PL (1) | PL1904312T3 (en) |
RU (1) | RU2407651C2 (en) |
WO (1) | WO2006128607A2 (en) |
ZA (1) | ZA200710303B (en) |
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- 2006-05-22 EP EP06753761.3A patent/EP1904312B1/en not_active Revoked
- 2006-05-22 US US11/915,965 patent/US8875628B2/en not_active Expired - Fee Related
- 2006-05-22 WO PCT/EP2006/004819 patent/WO2006128607A2/en active Application Filing
- 2006-05-22 CA CA002607980A patent/CA2607980A1/en not_active Abandoned
- 2006-05-22 AU AU2006254436A patent/AU2006254436B2/en not_active Withdrawn - After Issue
- 2006-05-22 RU RU2007147694/12A patent/RU2407651C2/en not_active IP Right Cessation
- 2006-05-22 BR BRPI0613317-7A patent/BRPI0613317A2/en not_active IP Right Cessation
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- 2006-05-22 JP JP2008513972A patent/JP2008542070A/en active Pending
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2007
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WO2006128607A3 (en) | 2007-09-13 |
JP2008542070A (en) | 2008-11-27 |
AU2006254436B2 (en) | 2012-05-10 |
WO2006128607A2 (en) | 2006-12-07 |
CN101184632B (en) | 2013-07-24 |
US20080250954A1 (en) | 2008-10-16 |
RU2007147694A (en) | 2009-07-20 |
US8875628B2 (en) | 2014-11-04 |
CA2607980A1 (en) | 2006-12-07 |
MX2007015133A (en) | 2008-02-19 |
AU2006254436A1 (en) | 2006-12-07 |
BRPI0613317A2 (en) | 2012-10-09 |
EP1904312B1 (en) | 2013-07-17 |
PL1904312T3 (en) | 2013-12-31 |
ZA200710303B (en) | 2008-12-31 |
CN101184632A (en) | 2008-05-21 |
DE102005025095A1 (en) | 2006-12-07 |
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