EP3231625B1 - Procede de traitement laser d'un revêtement comprenant des pigments à effets - Google Patents
Procede de traitement laser d'un revêtement comprenant des pigments à effets Download PDFInfo
- Publication number
- EP3231625B1 EP3231625B1 EP17000443.6A EP17000443A EP3231625B1 EP 3231625 B1 EP3231625 B1 EP 3231625B1 EP 17000443 A EP17000443 A EP 17000443A EP 3231625 B1 EP3231625 B1 EP 3231625B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- laser
- color
- pigments
- coating
- effect
- 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.)
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Links
- 239000000049 pigment Substances 0.000 title claims description 83
- 238000000576 coating method Methods 0.000 title claims description 45
- 239000011248 coating agent Substances 0.000 title claims description 43
- 238000000034 method Methods 0.000 title claims description 11
- 230000000694 effects Effects 0.000 title description 64
- 238000013532 laser treatment Methods 0.000 title 1
- 230000005855 radiation Effects 0.000 claims description 42
- 239000000126 substance Substances 0.000 claims description 37
- 239000000758 substrate Substances 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 13
- 238000010521 absorption reaction Methods 0.000 claims description 7
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 5
- 150000003863 ammonium salts Chemical class 0.000 claims description 5
- 239000011230 binding agent Substances 0.000 claims description 5
- 239000011733 molybdenum Substances 0.000 claims description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 4
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 4
- 238000004040 coloring Methods 0.000 claims description 3
- 239000004973 liquid crystal related substance Substances 0.000 claims description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 2
- 239000001569 carbon dioxide Substances 0.000 claims description 2
- QYCVHILLJSYYBD-UHFFFAOYSA-L copper;oxalate Chemical compound [Cu+2].[O-]C(=O)C([O-])=O QYCVHILLJSYYBD-UHFFFAOYSA-L 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims 1
- 239000003638 chemical reducing agent Substances 0.000 claims 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims 1
- 229910000476 molybdenum oxide Inorganic materials 0.000 claims 1
- 238000006722 reduction reaction Methods 0.000 claims 1
- 239000000463 material Substances 0.000 description 10
- 239000003086 colorant Substances 0.000 description 9
- 239000002985 plastic film Substances 0.000 description 5
- 229920006255 plastic film Polymers 0.000 description 5
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 4
- 239000010931 gold Substances 0.000 description 4
- 229910052737 gold Inorganic materials 0.000 description 4
- 229910052750 molybdenum Inorganic materials 0.000 description 4
- 238000002845 discoloration Methods 0.000 description 3
- 238000010330 laser marking Methods 0.000 description 3
- RMUPNSINHUOUPL-UHFFFAOYSA-N n-carbamimidoyl-n-cyanoformamide Chemical compound NC(=N)N(C=O)C#N RMUPNSINHUOUPL-UHFFFAOYSA-N 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000003595 spectral effect Effects 0.000 description 3
- 241000242757 Anthozoa Species 0.000 description 2
- 235000014653 Carica parviflora Nutrition 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000003698 laser cutting Methods 0.000 description 2
- 239000002932 luster Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000012209 synthetic fiber Substances 0.000 description 2
- 229920002994 synthetic fiber Polymers 0.000 description 2
- 241000526960 Amaranthus acanthochiton Species 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- -1 Iriodin Substances 0.000 description 1
- 238000002679 ablation Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- ZINJLDJMHCUBIP-UHFFFAOYSA-N ethametsulfuron-methyl Chemical compound CCOC1=NC(NC)=NC(NC(=O)NS(=O)(=O)C=2C(=CC=CC=2)C(=O)OC)=N1 ZINJLDJMHCUBIP-UHFFFAOYSA-N 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004383 yellowing Methods 0.000 description 1
Images
Classifications
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- 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
-
- 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
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
- B41M3/14—Security printing
- B41M3/146—Security printing using a non human-readable pattern which becomes visible on reproduction, e.g. a void mark
-
- 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
- B41M3/148—Transitory images, i.e. images only visible from certain viewing angles
Definitions
- the invention relates to a method for treating a coating, in particular for fiber substrates and foils, with laser radiation, the coating consisting of at least one binder, a laser-sensitive substance and an effect pigment.
- a substrate such as paper, for example, can be cut or perforated with a laser and that coatings applied to the substrate can be removed or discolored, whereby attractive and precisely registered effects can be produced.
- a method for changing the optical properties of a coating in which a coating which contains at least one effect pigment and at least one component absorbing IR radiation is irradiated with an IR laser.
- the component absorbing IR radiation is partially or completely removed from the irradiated areas of the coating and the effect pigment is partially or completely exposed in the irradiated areas.
- a method for laser marking a document in which a document comprising a coating containing at least one type of an effect pigment that shows different colors at different viewing angles and at least one type of a laser-sensitive pigment on a part of the coated area is treated with a laser beam and a laser marking is obtained with a solid color, the solid color being one of the different colors shown by the effect pigment at different viewing angles.
- the invention is based on the object of a generic security element to be further developed in such a way that the protection against counterfeiting is further increased.
- the laser-sensitive substance changes color when exposed to the laser radiation.
- the laser-sensitive substance is thus preferably converted or chemically reduced by the laser and is in particular not ablated or removed, (chemically) oxidized or displaced by the action of the laser radiation, so that the effect pigment is not partially or completely exposed in the irradiated areas .
- An IR laser is preferably used as the laser, ie a laser with an emission wavelength in the infrared wavelength range, preferably from 0.05 ⁇ m to 50 ⁇ m.
- a laser laser is, for example, a carbon dioxide or CO 2 laser with an emission wavelength in the range from 9 ⁇ m to 12 ⁇ m, particularly preferably 10.6 ⁇ m, a diode laser in the wavelength range from 50 nm to 1100 nm or a solid-state laser in the wavelength range from 1000 nm to 1100 nm, particularly preferably 1064 nm.
- the laser radiation of the IR laser causes molecular oscillations in the laser-sensitive substance, which in turn leads to kinetic energy and thus heat in the laser-sensitive substance and to a color change.
- the color change of the laser-sensitive substance takes place particularly well when the laser-sensitive substance has a high IR absorption for the emission wavelength of the laser radiation used, so that the majority of the incident laser energy can be converted into heat and thus the necessary temperature in the molecules of the laser-sensitive substance what is achieved is that these split up and colored connections are created.
- a quasi-pulsed laser is understood to be a laser that switches on the laser at full power for the specified switch-on time with a specified frequency and a specified switch-on time as a percentage of the resulting period duration.
- the laser used is preferably operated in the quasi-pulsed mode.
- the pulse frequency is 25 kHz, with a switch-on time of 25%, a forward speed of 2500 mm / s .
- the focus diameter of the laser beam is approx. 160 ⁇ m. If a surface is to be created, experience has shown that a line spacing of 0.1 mm makes sense in this example.
- a color change within the meaning of this invention is a change from one color to another color, for example from red to green, a change from a light shade to a dark shade, for example from light green to dark green, from a dark shade to a light shade or also a change from one contrast to another, for example from white or colorless to black.
- binders are suitable as binders.
- binders are preferred which have a high transmission for the wavelength of the laser radiation used, so that as much of the laser radiation as possible reaches the laser-sensitive substance and energy is available for the color change.
- a metal salt is preferably used as the laser-sensitive substance, particularly preferably an ammonium salt of molybdenum.
- the color change in the case of ammonium salts of molybdenum is particularly good because they have a high Have IR absorption for the emission wavelength of a CO 2 laser, so that the majority of the incident laser energy can be converted into heat and the temperature required in the molecules of the ammonium salts of molybdenum is reached so that they split and colored compounds are formed.
- copper (II) oxalate or iron (II, III) oxide Fe 2 O 3 are preferably also possible.
- laser-sensitive substances are known, for example, from the following publications: EP 1657072 B1 , EP 2332012 B1 , US 7270919 , US 7485403 , US 7998900 , US 8021820 , US 8048608 , US 8048605 , US 8083973 , US 8101544 , US 8101545 , US 8105506 , US 8173253 , US 8178277 , US 8278243 , EP 1 368 200 B2 , EP 2 528 742 B1 , US 8278244 and US 842028 .
- the laser-sensitive substance is particularly preferably colorless or white, so that the non-lasered areas appear in the usual glossy effect, as is known from coatings with so-called pearlescent pigments (somewhat weakened by the laser-sensitive substance). If a color change is now induced in the laser-sensitive material (e.g. from white to black), for example through the necessary temperature input or by means of laser irradiation, a kind of "background color” is created, with the result that in these areas, in combination with the pearlescent pigments, a different color than the the non-lasered areas becomes visible. Depending on which laser-sensitive substance is used and which color change it shows (e.g. to red, green, blue, etc.), different background colors and thus also different colors in connection with the pearlescent pigments are created. A color change from white to black of the laser-sensitive substance used is preferably used.
- the action of the laser radiation thus produces a background coloration which changes or intensifies the color and color saturation of the effect pigment used in each case, but without changing the effect pigment itself.
- a preferred effect pigment or pearlescent pigment of this type is, for example, “Merck Colorstream® T10-03 Tropic Sunrise”, which, without a laser-sensitive dye, shows interference effects from light green to light red and pearlescent.
- Another preferred pearlescent pigment “Merck Colorstream®T10 ⁇ 02 Arctic Fire” shows interference effects from light green to light purple and pearlescent without a laser-sensitive dye.
- Another preferred pearlescent pigment “Merck Iriodin® 225 Rutile Pearl Blue” shows a light pearlescent blue without a laser-sensitive dye.
- Another preferred pearlescent pigment "Eckart Phoenix PX 1221 Gold” shows a light pearlescent gold without a laser-sensitive dye.
- the color of the effect pigment used in each case is intensified in the mixture with the laser-sensitive substance through the laser irradiation, i.e. a weak purple becomes an intensely glittering purple, a light green becomes a dark green, etc.
- the combination of these pigments with the laser-sensitive material enables different color changes and a wide range of different color changes due to laser irradiation.
- a forger prints a black surface with a conventional printer and coats this surface with the respective pearlescent coating without laser-sensitive dye
- another color is also visible in the surface.
- this color is significantly lighter than the color that is created with the laser-induced color effect, for example light green instead of dark green.
- clear interference effects and the strong pearlescent luster are still visible, which is not the case with the lasered black surface. Counterfeiting in this form does not lead to an optical effect that is comparable to that of the method according to the invention.
- a glitter of the pearlescent coating can only be determined after the laser irradiation. This also gives you the option of marking the pure pearlescent coating with the laser without the need for a laser-sensitive material. The glittering areas then represent the marking.
- the glitter comes about when a high absorption of the corresponding laser wavelength is achieved in the coating and the laser energy is efficiently converted into heat.
- the surface of the coating is roughened and the flake-form effect pigments are exposed and set up.
- the light is refracted and reflected more strongly. If the laser-sensitive substance has a high absorption of the corresponding laser wavelength, more laser energy is converted into heat and the Surface roughened even more. This will further enhance the glitter.
- the surface of a coating that contains the pearlescent pigment "Merck Colorstream® T10-03" without a laser-sensitive substance is not as roughened as with the laser-sensitive substance, since the absorption of the laser wavelength used with such effect pigments and their coating is not as high as the absorption of the laser-sensitive substance for this wavelength. A glittering effect can still be observed, even if this is not as pronounced as with the coating with the addition of the laser-sensitive substance.
- fine effect pigment particles with a diameter of less than about 10 ⁇ m generally produce a silky luster, while larger or coarser effect pigment particles with a diameter of about 10 ⁇ m to about 50 ⁇ m glitter with greater brilliance.
- the glittering effect of the lasered areas can then possibly also be attributed to the fact that the effect pigments melt due to the thermal effect of the laser and form larger agglomerates or pigment particles after cooling.
- the combination of the laser-sensitive substance with effect pigments increases the security against forgery of the laser-induced color effects considerably, since such glitter effects and color changes in connection with the precisely registered combination with a laser cutting of the substrate, as it is for example from WO 2010/072329 A1 is known, a security thread or a security strip cannot be printed in the appropriate fineness and register.
- the mixture of the laser-sensitive substance and the effect pigments is colored with further color pigments.
- these coloring pigments must not absorb the wavelength of the laser used, so that they do not disintegrate into a differently colored substance and thereby cause unexpected color changes in the coating after the laser irradiation.
- the coloring of the mixture has the advantage that it is more difficult for counterfeiters to recognize a connection between the coating color and the color result after the laser irradiation.
- a suitable and IR-transparent color pigment e.g. red
- two or more surfaces are applied next to one another or in a pattern, at least one surface having a laser-sensitive coating without effect pigment and at least one adjacent surface having a laser-sensitive coating with effect pigment.
- different patterns, symbols or perforations can be lasered across areas, as shown, for example WO 2010/072329 A1 or WO 20111/54112 A1 are known, so that there are two different, but precisely registered color effects.
- two or more surfaces are applied next to one another or in a pattern, with at least one surface having a laser-sensitive coating with a color or an effect pigment that does not change color when the viewing angle is changed (so-called color fix), and at least an adjacent surface has a laser-sensitive coating with effect pigment, which changes its color when the viewing angle is changed (so-called color shift).
- color fix a laser-sensitive coating with a color or an effect pigment that does not change color when the viewing angle is changed
- at least an adjacent surface has a laser-sensitive coating with effect pigment, which changes its color when the viewing angle is changed (so-called color shift).
- the area with Color-Fix shows a green star after exposure to laser radiation, which does not change its color when the viewing angle is changed
- the area with Colorshift shows a blue stripe after exposure to laser radiation at a certain viewing angle, which when the viewing angle changes Changes its color to the green color of the star.
- two or more surfaces are applied next to one another or in a pattern, with at least one surface having a laser-sensitive coating with an effect pigment after exposure to laser radiation, which changes its color when the viewing angle is changed (first color shift), and at least one adjacent surface has a laser-sensitive coating with another effect pigment, which also changes its color when the viewing angle is changed, but differently (second color shift).
- first color shift a laser-sensitive coating with an effect pigment after exposure to laser radiation
- second color shift which changes its color when the viewing angle is changed
- both surfaces change their color, but both surfaces show a different color-shifting effect.
- one surface shows a color change from red to green and at the same time the other surface shows a color change from green to purple. It is particularly preferable for the colors of the two surfaces to match at a specific viewing angle.
- the area with the first color shift shows a blue star at one viewing angle and the area with the second color shift shows a blue stripe, both areas with another change their color to green at certain viewing angles.
- the area with the first color shift shows a blue star at one viewing angle and the area with the second color shift shows a green stripe, with the star changing its color to green and the Stripe changes color to blue.
- the color change and / or the non-changing color are possible both in the light of the visible wavelength range and in the non-visible wavelength range, for example in the ultraviolet wavelength range.
- one area shows a color change or a non-changing color in the visible wavelength range and another area with fluorescent pigments shows a similar or different color change or a similar or different color in the ultraviolet wavelength range.
- adjacent or adjacent is understood to mean both a "direct" abutment without a gap between the surfaces, possibly also with a slight overlap, and an adjoining with a gap.
- the lasering takes place in the form of a so-called negative pattern, with the entire surface being exposed to laser radiation and only a pattern, symbol, etc. to be generated is not exposed to laser radiation.
- a laser-ablatable ink or another laser-ablatable material can also be printed as an adjacent area or applied.
- the laser ablates this color or the respective substance and seamlessly changes over to the discoloration of the other surface.
- two areas of different color composition are printed on top of one another (also divided, in areas or in a pattern to one another), one area having the laser-sensitive coating without effect pigment and the other area having the laser-sensitive coating with effect pigment.
- the present invention enables colored instead of just black laser markings, but the color of very thin lines that are colored by the laser is difficult to see with the naked eye.
- the DE 10 2016 014 662 A1 describes a window lasered into the paper with, on the one hand, a see-through area and, on the other hand, a color shift or blue / gold metallization. In this way, surprisingly interrelated designs can be produced on the front and back of the bank note.
- the color of very thin lines is further improved by printing the laser-sensitive material combined with color pigments or effect pigments such as Iriodin, Liquid Crystals, STEP pigments, fluorescent pigments or pigments capable of Colorshift on the back of the banknotes behind the security film or where the window is should be placed.
- the window created with the laser can be supplemented inline in one laser step with a laser-induced color effect in 100% registration with the window.
- the window can be, for example, a laser hole, laser cut, filigram or a laser perforation.
- the color and effect of the thin color effect lines come into their own when the back of the security film, which is visible through the window, has colors or effects that match the laser-sensitive material and color effect (e.g. color shift, fluo, gold-blue, LC etc.) .) shows.
- Color shift effects that also match (in terms of color) the color shift effects of the security film or correlate with them in a logical manner are also possible, as there are also color shift-capable effect pigments that have a color shift similar to that of the laser-sensitive material, but also of the laser-induced color effects enable.
- Fluorescent pigments can also be mixed with the laser-sensitive substance and are very clearly visible in the ultraviolet spectral range. This results in further color combination possibilities, for example colors recognizable in the ultraviolet spectral range in combination with colors recognizable in the visible spectral range.
- the lasered design on the back can be matched to or complement the design of security strips on the front of a banknote. This also creates a logical correlation in the design of two different security features. For example, a security strip shows corals on its front and the same corals are mirrored as a color effect lasered into the laser-sensitive material on the back of the banknote.
- the surface of the laser-sensitive material can also be printed in the design of the bank note in order to generate an additional upgrade of the bank note design.
- the laser-sensitive fabric is made in Iriodin blue, a blue shell is also visible through laser holes, a color effect matching the shell color is also visible and the laser-sensitive fabric can also be printed in a design. Further refinement in terms of variations in the color area size, color effect lines and window size is possible depending on productivity.
- the general color of the design composition can particularly preferably be increased if a differently colored security film is visible through a window in the banknote substrate.
- the laser-sensitive substance can particularly preferably function as a backside coating substitute.
- the substrate particularly preferably consists of paper made of cotton fibers, as is used, for example, for banknotes, or of other natural fibers or of synthetic fibers or a mixture of natural and synthetic fibers, or of at least one plastic film.
- the substrate preferably consists of a combination of at least two different substrates arranged one above the other and connected to one another, a so-called hybrid.
- the substrate consists, for example, of a combination of plastic film-paper-plastic film, i.e. a substrate made of paper is covered on each of its two sides by a plastic film, or a combination of paper-plastic film-paper, i.e. a substrate made of a plastic film is covered on each of its covered by paper on both sides.
- the coating according to the invention is preferably located on the inner paper substrate and is particularly well protected against damage or counterfeit attacks by the plastic films.
- the font DE 102 43 653 A9 states in particular that the paper layer usually has a weight of 50 g / m 2 to 100 g / m 2 , preferably of 80 g / m 2 to 90 g / m 2 .
- any other suitable weight can be used depending on the application.
- Documents of value for which such a substrate or security paper can be used are in particular banknotes, shares, bonds, certificates, vouchers, checks, high-quality admission tickets, but also other forgery-prone papers, such as passports and other identification documents, as well as cards, such as credit cards. or debit cards, the card body of which has at least one layer of security paper, and also product security elements such as labels, seals, packaging and the like.
- the simplified designation of value document includes all of the above materials, documents and product security means.
- Fig. 1 shows a coating according to the invention, composed inter alia of pearlescent pigments “Merck Colorstream® T10-03” with a laser-sensitive substance that has not yet been exposed to the laser radiation of a CO 2 laser, and Fig. 2 after exposure to laser radiation from a CO 2 laser.
- the surface of the coating is heavily roughened as a result of the lasering.
- the CO 2 laser with an emission wavelength of 10.6 ⁇ m and a maximum laser power of 30 W is operated in quasi-pulsed mode with a frequency of 25 kHz, with a switch-on time of 25%, an advance speed of 2500 mm / s and a line spacing (hatch) of 0.1 mm.
- Fig. 3 shows a coating with pearlescent pigments “Merck Colorstream® T10-03” without a laser-sensitive substance, which has not yet been exposed to the laser radiation of a CO 2 laser, and Fig. 4 after exposure to laser radiation from a CO 2 laser with the above values.
- the surface of the coating is also roughened, but much smaller than in Fig. 2 .
- Fig. 5 shows cross-area lasing over two different areas 1 and 2 with and without pearlescent pigments.
- Area 1 has a laser-sensitive coating without pearlescent pigments (here color white) and area 2 has a laser-sensitive coating with pearlescent pigments (here color green).
- a laser beam hits the surfaces in the form of the three wave-like lines 3 and 4, so that in surface 1 there is a color change of the waves 3 from white to black and in surface 2 there is a color change of the waves 4 from pearlescent green to dark green.
- long-wave IR radiation such as. B. the CO 2 laser radiation with an emission wavelength of 10.6 ⁇ m, there is also a glitter effect in the lasered areas.
- Fig. 7 shows a combination for areas printed one above the other, in which two layers of different color compositions are printed one above the other, with area 1 being the laser-sensitive coating without effect pigments and area 2 being the laser-sensitive coating with effect pigments.
- the laser beam generates as in Fig. 5 three wave-like lines, with the waves 3 in turn experiencing a color change from white to black and the waves 4 from pearlescent green to dark green.
- long-wave IR radiation such as. B. the CO 2 laser radiation with an emission wavelength of 10.6 ⁇ m
- the edge effect is in Fig. 7 illustrated as black lines at the edge of the waves 7.
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Claims (6)
- Procédé pour le traitement d'un revêtement, en particulier pour des substrats fibreux et des feuilles, par un rayonnement laser, le revêtement étant constitué au moins par un mélange d'un liant, d'une substance sensible au laser et d'un pigment conférant un effet, caractérisé en ce que la substance sensible au laser accomplit un changement de couleur sous l'action du rayonnement laser, une coloration de sous-couche étant générée par l'action du rayonnement laser, qui modifie ou qui renforce la teinte et la saturation de couleur du pigment conférant un effet respectif utilisé sans toutefois modifier le pigment conférant un effet lui-même.
- Procédé selon la revendication 1, caractérisé en ce qu'on utilise un laser présentant une longueur d'onde d'émission de 0,05 µm à 50 µm, de préférence un laser au dioxyde de carbone présentant une longueur d'onde d'émission dans la plage de 9 µm à 12 µm ou un laser à diode présentant une longueur d'onde d'émission dans la plage de 50 nm à 1100 nm ou un laser à semi-conducteur présentant une longueur d'onde d'émission dans la plage de 1000 nm à 1100 nm.
- Procédé selon au moins l'une quelconque des revendications précédentes, caractérisé en ce que la substance sensible au laser est transformée ou réduite chimiquement lors de l'action du rayonnement laser.
- Procédé selon au moins l'une quelconque des revendications précédentes, caractérisé en ce qu'on utilise, comme substance sensible au laser, un sel métallique, de préférence un sel d'ammonium du molybdène, l'oxalate de cuivre (II) ou l'oxyde de fer (II, III) Fe2O3.
- Procédé selon au moins l'une quelconque des revendications précédentes, caractérisé en ce qu'on utilise, comme pigment conférant un effet, des pigments nacrés, des pigments fluorescents, des pigments OVI (optiquement variables) ou des pigments à cristaux liquides.
- Procédé selon au moins l'une quelconque des revendications précédentes, caractérisé en ce que le mélange de la substance sensible au laser et des pigments conférant un effet est teinté par d'autres pigments colorés, les autres pigments colorés présentant une absorption la plus faible possible pour la longueur d'onde du laser utilisé.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL17000443T PL3231625T3 (pl) | 2016-04-12 | 2017-03-17 | Sposób obróbki laserowej powłoki zawierającej pigmenty efektowe |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102016004424.1A DE102016004424A1 (de) | 2016-04-12 | 2016-04-12 | Laserung einer Beschichtung mit Effektpigmenten |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3231625A1 EP3231625A1 (fr) | 2017-10-18 |
EP3231625B1 true EP3231625B1 (fr) | 2021-10-27 |
Family
ID=58401321
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17000443.6A Active EP3231625B1 (fr) | 2016-04-12 | 2017-03-17 | Procede de traitement laser d'un revêtement comprenant des pigments à effets |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3231625B1 (fr) |
DE (1) | DE102016004424A1 (fr) |
ES (1) | ES2898786T3 (fr) |
PL (1) | PL3231625T3 (fr) |
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US842028A (en) | 1905-09-18 | 1907-01-22 | Edward F Shue | Sound-recording and reproducing mechanism. |
NZ218573A (en) | 1985-12-23 | 1989-11-28 | Optical Coating Laboratory Inc | Optically variable inks containing flakes |
DE4334848C1 (de) | 1993-10-13 | 1995-01-05 | Kurz Leonhard Fa | Wertpapier mit Fenster |
DE19544130A1 (de) | 1995-11-27 | 1997-05-28 | Giesecke & Devrient Gmbh | Datenträger mit optisch variabler Farbe |
US7403651B2 (en) * | 2000-11-04 | 2008-07-22 | Leonhard Kurz Gmbh & Co. Kg | Plastic body in the form of a film, for example a transfer film or laminating film, or provided with such a film and a process for the production of a multi-color image on or in such a plastic body |
DE60232829D1 (de) | 2001-03-16 | 2009-08-13 | Datalase Ltd | Verfahren zur Erzeugung eines Bildes durch Laser |
US8048605B2 (en) | 2001-03-16 | 2011-11-01 | Datalase Ltd | Laser-markable compositions |
DE10243653A1 (de) | 2002-09-19 | 2004-04-01 | Giesecke & Devrient Gmbh | Sicherheitspapier |
WO2004043704A1 (fr) | 2002-11-12 | 2004-05-27 | Sherwood Technology Limited | Utilisation de composes de metaux de transition dans des revetements de formation d'images |
EA007846B1 (ru) | 2003-04-04 | 2007-02-27 | Ландкарт | Признак защиты |
ATE406421T1 (de) * | 2003-07-30 | 2008-09-15 | Datalase Ltd | Lasermarkierbare zusammensetzungen |
GB0400813D0 (en) | 2004-01-14 | 2004-02-18 | Sherwood Technology Ltd | Laser imaging |
DE102004046695A1 (de) | 2004-09-24 | 2006-03-30 | Giesecke & Devrient Gmbh | Optisch variables Sicherheitselement |
US7998900B2 (en) | 2004-11-12 | 2011-08-16 | Datalase Ltd. | Photothermal recording medium |
GB0428299D0 (en) | 2004-12-24 | 2005-01-26 | Ciba Sc Holding Ag | Coating compositions for marking substrates |
MY143187A (en) | 2005-03-23 | 2011-03-31 | Ciba Holding Inc | Coating compositions for marking substrates |
GB0521513D0 (en) | 2005-10-21 | 2005-11-30 | Sherwood Technology Ltd | Laser marking on substrates |
GB0524673D0 (en) | 2005-12-02 | 2006-01-11 | Sherwood Technology Ltd | Laser-imageable marking composition |
WO2007088104A1 (fr) | 2006-01-31 | 2007-08-09 | Ciba Holding Inc. | Composition de revetement pour le marquage de substrats |
GB0611325D0 (en) | 2006-06-08 | 2006-07-19 | Datalase Ltd | Laser marking |
BRPI0720673A2 (pt) | 2007-01-09 | 2014-01-28 | Ciba Holding Inc | Composição sensível à radiação eletromagnetica ou térmica |
DE102007036623A1 (de) | 2007-07-03 | 2009-01-08 | Giesecke & Devrient Gmbh | Sicherheitsmerkmal und Verfahren zu seiner Herstellung |
GB0801440D0 (en) | 2008-01-25 | 2008-03-05 | Datalase Ltd | Polychromic substances and their use |
DE102008046513A1 (de) | 2008-09-10 | 2010-04-29 | Giesecke & Devrient Gmbh | Verfahren zur Herstellung eines Sicherheits-oder Wertdokuments |
WO2010029329A1 (fr) | 2008-09-10 | 2010-03-18 | Datalase Ltd. | Compositions activées par une énergie |
EP2174796B1 (fr) * | 2008-10-07 | 2012-07-25 | European Central Bank | Méthode de marquage par laser d'un document, le document doté d'une couleur fixe dans un environnement doté d'un effet de décalage de couleur |
DE102009011424A1 (de) | 2008-12-22 | 2010-07-01 | Giesecke & Devrient Gmbh | Datenträger mit Durchsichtsbereich |
GB2477139A (en) | 2010-01-25 | 2011-07-27 | Datalase Ltd | Inkless printing apparatus |
DE102010022990A1 (de) | 2010-06-08 | 2011-12-08 | Giesecke & Devrient Gmbh | Datenträger mit Merkmalsbereich |
DE102010053052A1 (de) | 2010-12-01 | 2012-06-06 | Giesecke & Devrient Gmbh | Datenträger mit Kennzeichnung |
ES2633025T3 (es) | 2014-05-23 | 2017-09-18 | Merck Patent Gmbh | Procedimiento para el tratamiento con láser de recubrimientos |
DE102016014662A1 (de) | 2016-12-09 | 2018-06-14 | Giesecke+Devrient Currency Technology Gmbh | Wertdokument |
-
2016
- 2016-04-12 DE DE102016004424.1A patent/DE102016004424A1/de not_active Withdrawn
-
2017
- 2017-03-17 EP EP17000443.6A patent/EP3231625B1/fr active Active
- 2017-03-17 ES ES17000443T patent/ES2898786T3/es active Active
- 2017-03-17 PL PL17000443T patent/PL3231625T3/pl unknown
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
---|---|
DE102016004424A1 (de) | 2017-10-12 |
EP3231625A1 (fr) | 2017-10-18 |
PL3231625T3 (pl) | 2022-01-17 |
ES2898786T3 (es) | 2022-03-08 |
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