Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
  • B41M7/009—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using thermal means, e.g. infrared radiation, heat
• • 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
  • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
  • B41M7/0081—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • 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
  • 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 applying colored characters to a data carrier, preferably made of plastic, according to the preamble of claim 1 and claim 2, and to a data carrier produced according to this method according to claim 3.
• Data carriers preferably made of plastic, are known in various forms as chip cards, for example in the form of credit cards, access authorization cards, bank cards and the like, and are used in a wide variety of service areas.
• the data carriers mostly have an integrated circuit on the front, the so-called chip module, and additionally or alternatively, a magnetic strip on the back of the data carrier.
• the chip module as well as the magnetic stripe contain electronic information that is necessary for the use of the data carrier in the various service areas. The information on these components can only be read with the help of specially suitable devices. In order to be able to allocate data carriers visually, it is desirable and customary to legibly apply special data relating to the cardholder to the card.
• EP 0 190 997 A2 mentions a film which was produced using 1,4-diko-3,6-di-parachlorophenyl-pyrrolo- [3,4-c] pyrrole-P ⁇ mentsen when this film is irradiated with An Nd YAG pulse laser creates a black lettering with good contrast. Firstly, these are not latent pigments, since the film has a red color from the start, and secondly, only a blackening is achieved. It is therefore a carbonization process
• DE 39 01 988 A1 describes a chemical compound that crystallizes from organic solvents in an orange-colored modification and converts to a yellow modification when heated
• EP 0 327 508 A2 discloses an organic material which on the one hand contains a bleachable additive consisting of at least one azo and / or indanthrone pigment and on the other hand a non-bleaching compound consisting of at least one inorganic and / or organic pigment and / or contains a polymer-free dye.Therefore, no latent pigment is used, but a combination of a bleachable substance and a non-bleachable pigment.To ensure a contrast between a bleached and unbleached area, it is necessary with this material to cover the non-bleachable pigment limited to dark shades for covering the non-bleachable pigment
• the invention is therefore based on the object of providing a method for applying colored characters to data carriers, preferably made of plastic, which is simple and inexpensive and, moreover, offers hitherto unknown protection against forgery against unauthorized manipulation of the information which is visually legible on a data carrier
• the object is achieved in that, in a first method step, latent pigments introduced into a surface layer or near-surface layer of the data carrier, in which the absorption behavior of the pigments changes due to energetic excitation, at the points not provided for the drawing an irradiation with light waves in the UV wavelength range is energetically stimulated in such a way that the previously irradiated pigments are colorless and that in a second process step the latent pigments arranged at the locations in the surface layer intended for the character display are energetically energized by laser radiation are stimulated in such a way that the color of the latent pigments changes
• the latent pigments can be inexpensively implemented in a data carrier in various ways, there is a particularly cost-effective manufacturing process for the colored labeling or marking of a data carrier, such as a chip card, in which the multi-layer, complex structure with different color layers that has been customary up to now can be omitted
• the latent pigments are, for example, diketo-pyrrolo-pyrroles, which repigment due to thermal excitation in diketo-pyrrolo-pyrrole system dyes. In the unirradiated state, such latent pigments are usually colorless or slightly colored. The pigments are only activated by energetic stimulation and the desired color change to a powerful, clearly visible color is brought about.
• the second subsequent method step is connected to the laser radiation of a data carrier
• the described second process step takes advantage of the property of latent pigments that a different color change of the latent pigments can be brought about by different energetic stimulation. If, after the colored characters, letters or other patterns have been applied, the data carrier is irradiated over a large area with UV light, then convert The latent pigments, which have not yet been energetically influenced, change their colorless status. This conversion is just as irreversible as the application of colored characters described above with the aid of laser irradiation.
• the latent pigments introduced into a surface layer of the data carriers are energetically stimulated at the points not intended for the representation of the characters by irradiation with light waves in the UV wavelength range in such a way that In the case of the pigments irradiated in this way, the pigments are rendered colorless.
• the latent pigments arranged at the locations in the surface layer provided for the drawing are energetically excited by appropriate laser irradiation in such a way that a color change in these pigments becomes visually clear visible color takes place
• the invention further relates to a data carrier produced by the above-described method according to the invention with a data carrier body, in which latent pigments in at least one partial layer of the
• the latent pigments can be arranged in or on the data carrier body in different ways in accordance with the features of subclaims 4 to 8
• the latent pigments in a cover film applied to the outer surface of the data carrier.
• Such films can be produced in a simple and cost-effective manner and can be connected to the data carrier body just as cost-effectively. It is also advantageous if those with the latent Films provided with pigments are additionally attached to the data carrier with a cover film covering them, so that the layer provided with the latent pigments is removed from direct mechanical access
• the latent pigments into a coating system, the coating system being able to provide, for example, a lacquer application or an adhesion promoter application during data carrier production.
• the lacquer or adhesion promoter application is carried out in a conventional manner by screen, offset, pad printing or corresponding roller application, of course a full-surface as well as a partial-surface application of the lacquer is conceivable, so that only certain areas of the data carrier surface can be provided for a colored marking carried out according to the method according to the invention
• the latent pigments can also be arranged in an overlay layer and / or in a layer close to the surface covered by the overlay layer
• An alternative way of attaching the latent pigments to a data carrier provides for the material of the data carriers to be enriched with the latent pigments before the shaping process for the data carrier body, for example by injection molding.
• the entire card body can be enriched with the latent pigments or it can be With the help of multi-component injection molding technology, certain parts of the carrier body can be produced from the material enriched with the latent pigments
• Figure 2 shows a cross section through an injection molded process
• FIG. 3 shows a schematic diagram of the absorption behavior of a latent pigment as a function of the wavelength of the light with which it is irradiated
• Figure 4 shows a structural formula for an example of a latent pigment N, N ' -b ⁇ s- ⁇ so-pentoxycarbonyl-1, 4-d ⁇ keto-3,6-d ⁇ - (chlorophenyl) pyrrolo [3,4-c] pyrrole
• Figure 5 shows a structural formula for an example of a pigment 1, 4-d ⁇ keto-3,6-d ⁇ - (chlorophenyl) pyrrolo [3,4-c] pyrrole
• the data carrier body shown in FIG. 1 in the form of a chip card essentially consists of two cores 1 and 2, onto which transparent cover foils 3, 4, 5 and 6 are applied on the top and bottom of the data carrier.
• a coating layer 7 consisting of an adhesive or varnish in which the latent pigments are implemented.
• the varnish or adhesive layer 7 is thus protected, on the one hand, under the immediate surface of the data carrier, but can be laser irradiated through the transparent cover film 6 be energized so that energetic excitation of the latent pigments is possible, which causes a color change of the pigments at the irradiated areas
• the laser beam source another high-energy, highly concentrated light source can be used, which emits light in the visible or IR range. It may be necessary to use optical filters that eliminate disturbing wavelengths
• Lamps or UV lasers can be used as light sources for the UV radiation. If necessary, disruptive wavelengths of these light sources are filtered out with optical filters
• a coating layer 8 is arranged between the cover foils 3 and 4 analogously to the structure described above, and there is also a further coating layer 9 between the cover foil 4 on the inside and the core foil 1, so that in this case Structure in the coating layers 8 and 9 different latent pigments can be implemented in order to be able to produce characters of different colors in this way
• the latent pigments can also be contained in at least one cover film 3, 4, 5, 6
• the data carrier body shown in FIG. 2 is a variant of a chip card produced using injection molding technology.
• the chip card body essentially consists of a core layer 11 with film layers arranged above it on both flat sides of the carrier body.
• the data carrier body of this embodiment is in the so-called 2K injection molding process is produced and has a second core layer 12 enriched with latent pigments. Over these two core layers 11 and 12, further cover foils 13, 14 and 15 are attached, the cover layers 14 and 15 having to be transparent to produce the colored characters, provided the core layer 12 is enriched with the latent pigments
• FIG. 2 also shows a possibility of providing the data carrier body with labein or pre-foils 16, 17. These pre-foals 16, 17 are provided with latent pigments in an upstream manufacturing process and then arranged on or in the data carrier
• pre-foals 16, 17 are provided with latent pigments in an upstream manufacturing process and then arranged on or in the data carrier
• lacquer or adhesive layers enriched with latent pigments it is also conceivable in the case of a data carrier body of FIG. 2 produced by the injection molding process to provide it with lacquer or adhesive layers enriched with latent pigments, in order in this way to introduce the latent pigments into the data carrier, with the aid of which colored labeling of these is possible ,
• FIG. 3 shows which change in the absorption behavior in the case of a latent pigment is brought about by irradiation with light of different wavelengths (in this case on the one hand light with laser wavelength ⁇ E 1 and on the other hand light in the UV wavelength range ⁇ E 2 ).
• the absorption curve of the “inactive pigment” shown in dashed lines has no absorption capacity in the visible spectral range, which means that this pigment is perceived as colorless.
• the absorption behavior of the “latent pigment”, shown as the third solid curve, is influenced by the different wavelengths ⁇ E 1 and ⁇ E 2 to the extent that the absorption behavior is present or not in the visible spectrum and that any subsequent change in the absorption capacity due to new light irradiation is arbitrary Wavelength is not possible.
• the chemical compound according to FIG. 4 is suitable as a possible latent pigment.
• the colored chemical compound shown in FIG. 5 is formed from this compound by laser irradiation.
• the latent pigment according to FIG. 4 is characterized by a pale yellow color. This latent pigment is cleaved back at a temperature of approx. 260 ° C., and the pigment according to FIG. 5 is formed, which is distinguished by a brilliant red color, Color Index: PR254.
• a plastic card with core films 1, 2 made of polycarbonate is used as the data carrier body, which contains a screen printing lacquer based on polyurethane with an admixture of 5% latent pigment content in a coating layer 7.
• the coating layer 7 of the screen printing lacquer mixed with latent pigments is 10 ⁇ m thick. This layer is covered with a transparent cover film 6.
• the laser beam source that transforms the latent pigment into the red pigment is a tunable, pulsed OPO laser, which in this example emits radiation with a wavelength of 430 nm.
• the pulse energy of the laser radiation is 60 mJ and the pulse frequency is 1 kHz.
• the laser beam passes through a lens system that focuses the beam.
• the diameter of the laser beam in the focus is 100 ⁇ m.
• the laser system is arranged in such a way that the laser beam penetrates the cover film 6 approximately at a right angle in the focus area and then hits the lacquer layer mixed with latent pigments.
• the laser beam is moved at a speed of 10 cm / s at right angles to the coating layer 7 of the data carrier body.
• the area of the lacquer layer 7 which was exposed to the laser radiation has assumed a clearly visible red color.
• the unirradiated area still has the pale yellow color of the latent pigment.
• the surface layer 6 of the data carrier body arranged at the bottom in FIG. 1 is now irradiated with the light of a xenon arc lamp with at least 0.35 W / m 2 .
• the xenon arc lamp emits light with a wavelength of 340 nm. This UV radiation penetrates the transparent cover film 6 and brings about a clear bleaching of the latent pigments in the coating layer 7, which manifests itself in the loss of the pale yellow background color of the data carrier body.

Applications Claiming Priority (3)

Publications (2)

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ID=7926087

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• 2000
  • 2000-10-18 DE DE50005042T patent/DE50005042D1/de not_active Expired - Lifetime
  • 2000-10-18 AU AU19943/01A patent/AU1994301A/en not_active Abandoned
  • 2000-10-18 DE DE10083149T patent/DE10083149D2/de not_active Withdrawn - After Issue
  • 2000-10-18 EP EP00983033A patent/EP1230094B1/fr not_active Expired - Lifetime
  • 2000-10-18 WO PCT/DE2000/003660 patent/WO2001028778A2/fr active IP Right Grant
  • 2000-10-18 AT AT00983033T patent/ATE257773T1/de not_active IP Right Cessation
• 2003
  • 2003-02-12 HK HK03101003A patent/HK1048789A1/xx unknown

Non-Patent Citations (1)

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