WO2013037473A1 - Dispositif permettant d'appliquer un marquage sur un substrat au moyen d'un faisceau laser - Google Patents

Dispositif permettant d'appliquer un marquage sur un substrat au moyen d'un faisceau laser Download PDF

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Publication number
WO2013037473A1
WO2013037473A1 PCT/EP2012/003801 EP2012003801W WO2013037473A1 WO 2013037473 A1 WO2013037473 A1 WO 2013037473A1 EP 2012003801 W EP2012003801 W EP 2012003801W WO 2013037473 A1 WO2013037473 A1 WO 2013037473A1
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WO
WIPO (PCT)
Prior art keywords
substrate
cylinder
coating
particles
ablated particles
Prior art date
Application number
PCT/EP2012/003801
Other languages
German (de)
English (en)
Inventor
Peter Schiffmann
Karlheinz Mayer
Walter DÖRFLER
Georg Depta
Harald Reiner
Original Assignee
Giesecke & Devrient Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Giesecke & Devrient Gmbh filed Critical Giesecke & Devrient Gmbh
Publication of WO2013037473A1 publication Critical patent/WO2013037473A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/16—Removal of by-products, e.g. particles or vapours produced during treatment of a workpiece
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
    • B23K26/142—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor for the removal of by-products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
    • B23K26/146—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor the fluid stream containing a liquid
    • 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
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/43—Marking by removal of material

Definitions

  • the invention relates to a device for introducing a marking on and / or into a substrate by means of a laser beam. At least one laser beam acts on the substrate and causes a change in the material of the substrate or a coating of the substrate on at least one of the surfaces of the substrate.
  • the substrate is guided over a rotatably mounted cylinder, while the laser beam acts on the substrate.
  • the substrate is at least partially in contact with the cylinder.
  • Such a generic device is known from the prior art.
  • a mark in the form of individual information on a security in particular a banknote, or a security sheet, on which there are several printed securities or banknotes, applied.
  • the individualized information is, for example, a serial number of the security or security sheet that is different for each security or security sheet.
  • the numbering machine consists of carrier disks and numbering units on these carrier disks, several numbering units being mounted on a carrier disk and several of these carrier disks being mounted on a shaft and the shaft being driven by at least one drive element with at least one rotary encoder.
  • Each of these numbering plants prints the individual information on the Security or the securities form whereby the individual information is changed in the next printing process. For example, the value of the serial number when printing individual securities after printing is increased or decreased by one.
  • a mark or individual mark to the substrate of the security or security sheet is by means of a laser beam.
  • the laser beam performs irreversible changes in the substrate of the security or security sheet, for example, by blackening of the substrate or ablation of substrate fabric or ink, which was previously printed on the substrate, wherein on the substrate or in the ink laser-sensitive materials are can be changed or ablated by the laser radiation.
  • a marking to the back side of the substrate from its front side through the substrate.
  • laser-sensitive materials are located only on the back side of the substrate, so that the laser radiation passes through the substrate almost unhindered and leads to a change in the substrate or a coating or ablation of particles only on its rear side.
  • a method for generating at least one identity mark on the front and back of a substrate of a security document in which the part of the identity mark on the back of the substrate is generated by the laser beam of a laser marking station arranged on the front side of the substrate is.
  • a portion on the back side of the substrate is here provided with a layer of a material which absorbs the laser radiation emitted by the laser beam.
  • the corresponding part of the identity mark is produced through the substrate on the back side of the substrate.
  • the substrate here is preferably made of paper, wherein the layer of absorbing material is a color, metal or ink layer.
  • the identity mark on the substrate is generated while the substrate is being transported on the same processing roll or processing cylinder.
  • the laser marking can thus also be carried out simultaneously on the front and rear side in or on the substrate or in coatings on the substrate, for example a printing ink with laser-sensitive materials.
  • An optional markable coating of the substrate may be applied by, among others, the following methods: offset printing, letterpress, indirect high pressure, gravure, intaglio, screen printing, OVD patch application, OVD strip application, metallization or sputtering. If in this document the marking of the substrate is mentioned, the possibility of marking a coating of the substrate on its front and / or rear side is always included. Furthermore, the laser marking can be carried out only on the front side or only on the back side of the substrate or the coating. This means that the laser marking takes place in one case on the laser beam facing and in another case on the side facing away from the laser beam.
  • any geometric shapes can be placed on or in the substrate.
  • letters and numbers of any type but also, for example, also drawings or images in arbitrary configurations can be introduced onto or into the substrate.
  • a device known from the prior art which applies a laser beam mark to the substrate of a security sheet, consists, according to FIG. 1 or FIG. 2, of a laser 3, which generates the laser beam 4, and a device, which moves the focus of the laser beam 4 with respect to the substrate 2 at least in the transverse direction of the substrate 2, preferably also in the direction of the thickness of the substrate 2 and in and against the running direction of the substrate.
  • a device for moving the focus of the laser beam 4 is for example a deflection of the laser beam 4 by means of movable mirrors or lenses or a displacement of the laser 3 itself by means of a spindle or belt.
  • the laser beam 4 then impinges in the region 5 on the substrate 2, in which the substrate 2 is guided by a cylinder 1 and rests on the surface of the cylinder 1. 1, the substrate 2 is unwound from a roll (not shown), passed over the cylinder and wound onto another roll (not shown).
  • the substrate 2 is held by grippers 6 on the cylinder 1, so that the substrate 2 can not slip on the cylinder 1 during the process of laser marking and the distance of the laser to the substrate is kept almost constant and thus defined. This is necessary for adjusting the focus of the laser on the substrate.
  • the cylinder 1 usually consists of an impression cylinder on which a coating is applied.
  • the coating is usually made of an elastomer, such as a rubber vulcanized on the impression cylinder in a web press or a clamped blanket or fabric cloth in a sheet-fed press.
  • the blanket consists of a fabric layer, applied to the at least one layer of an elastomer, preferably vulcanized.
  • the invention is therefore the object of developing a generic security element such that the disadvantages of the prior art are eliminated.
  • the surface of the cylinder which is in contact with the substrate absorbs ablated particles which, due to the laser radiation, detach from the side of the substrate which is in contact with the cylinder, so that the ablated particles do not return to the substrate Adhere substrate and not be transferred to a subsequent substrate.
  • the cylinder consists of a counter-pressure cylinder on which a printing plate is mounted instead of a blanket.
  • the printing form absorbs the ablated particles which, due to the laser radiation, detach from the side of the substrate which is in contact with the printing form.
  • a printing for example, a printing plate, a full-surface coated cylinder, a blanket with a special surface, a structured cylinder or a sleeve are used. Particularly preferred is the use of a printing plate.
  • a printing plate is understood to be a coating which can be fixed on the impression cylinder and which has partial depressions. The attachment can be done for example with slide rails or by double-sided adhesive tape on the impression cylinder.
  • the printing plate may have a carrier material, such as aluminum sheet, steel sheet or polyester film.
  • the printing plates are preferably washable photopolymer plates, laser- or mechanically engravable plates or blankets, strippable rubber blankets.
  • the printing plate may either be elastic on the surface, for example a flexographic printing plate Gold A from Flint Group, or hard, for example a high-pressure plate or Nyloprint plate from Flint Group.
  • a pressure plate it is also possible to coat a cylinder over the entire surface and to produce the recess in a further working step, for example by means of a laser, cutting tool, etching process or milling cutter.
  • Another variant is to provide the cylinder with a photosensitive layer, to expose and then wash. The exposed areas are hardened and therefore can not be washed out.
  • Another possibility is to structure a cylinder directly, for example by means of engraving tool or laser.
  • a sleeve This is a sleeve with a coating which already has the desired recesses and is clamped on a clamping cylinder. If the printing plates or the cylinders vary in thickness and it is not possible to compensate for the differences in thickness by means of backing materials, then inevitably results in different peripheral speeds on the printing plate surface despite the same production or angular velocity. By taking into account a distortion factor for the images to be introduced in the laser marking, it is possible to arrive at a non-distorted laser mark on the substrate.
  • the uptake of the particles by the printing form preferably takes place by means of two embodiments:
  • the printing forme at least in the region in which the laser beam acts on the substrate, at least one recess in which collect the ablated particles.
  • the bottom of the recess on the printing form is not in contact with the substrate, so that the ablated particles that collect in the recess, such as in a cavity or a cavity, not in contact with the substrate or a subsequent Substrate can come.
  • large recesses for example, have an area of more than 25 mm 2 , and in particular for very large recesses, for example, have an area of 400 mm 2 , it is also useful if at least one support point is arranged in at least one of the recesses on which the substrate rests.
  • at least one support point is arranged in at least one of the recesses on which the substrate rests.
  • the substrate quality for example, the rigidity
  • the required constant distance to the laser and thus the positioning of the substrate relative to the focus of the laser beam can thus no longer be maintained and assumes an undefined position.
  • the invention solves this problem by the substrate rests on the at least one support point, which is arranged in the interior of the recess, and is thereby held in the desired or required position relative to the foscus distance.
  • the support point in the geometric
  • a plurality of support points are preferably arranged within the recess, which are particularly preferably arranged like a grid, wherein they either have a constant distance from each other and a regular arrangement or are distributed irregularly or stochastically.
  • the contact point or the contact surface of the support point is chosen as small as possible in order to minimize the backside contamination of the substrate by abla- têt particles.
  • a grid point with a round contact surface is used as a base, which has a diameter of 0.05 mm to 2 mm, preferably from 0.2 mm to 2 mm.
  • a grid point and support lines can be used. If more than one support point is used, the ratio of the total contact area of the support points to the total area of the intervening recesses should be less than 50%, preferably less than 20% and particularly preferably less than 10%.
  • the support points are below the level of the remaining contact surface of the printing plate, ie the surface spanned by the upper edge of the support points lies below the lower edge of the surface, which is spanned by the rest of the printing plate.
  • This level distance is preferably between 0.02 mm and 1 mm, particularly preferably between 0.1 mm and 0.3 mm.
  • the size and shape of the recess is preferably matched to the size and shape of the geometrical shape to be applied to or introduced into the substrate and projects slightly beyond it. Due to the process tolerances in upstream printing and coating processes and the mechanical tolerances in the field of substrate guidance, for example by investors and grippers in a sheetfed machine, the supernatant or the enlargement of the recess to the motif of laser marking between 0.1 mm and 5 mm, preferably between 2 mm and 5 mm and more preferably between 3 mm and 5 mm to each adjacent edge.
  • the printing form can be completely rastered, the substrate in the area in which the mark is to be introduced, not fully over the printing form or the cylinder, but exclusively resting on support points.
  • These support points have a certain distance from each other and are preferably arranged like a grid.
  • a preferred raster has a resolution of 4 to 60 points or lines per cm, preferably from 20 to 60 points or lines per cm, and an area coverage of between 3% and 50%, preferably from 5% to 30% and particularly preferably 10 % to 20%.
  • the ablated particles accumulate between the support points.
  • the recess in the bottom area is not smooth, but is enlarged by rents (e.g., wavy or hemispherical array) in the surface to better temporarily fix the ablated particles.
  • At least one recess reflects the incident laser radiation which impinges on the recess through the substrate, retroreflectively or diffusely.
  • At least the bottom of the respective recess preferably also the surface between the recesses and / or the flanks of the recesses are configured diffusely mirror-like or retroreflective.
  • the corresponding area of the printing form for example, white particles such as ⁇ 1 ⁇ 2, which absorb the incident electromagnetic radiation of the laser beam and emit in almost all spatial directions again.
  • it can also be provided with a mirror coating or thin-film reflection matched to the wavelength of the laser.
  • the corresponding area of the printing form has, for example, back-mirrored microspheres, so-called Lüneburg lenses, or angular reflectors, so-called triple mirrors or cat's eyes, which reflect the incident electromagnetic radiation of the laser beam back in the direction from which the radiation originates has impacted the retroreflective element.
  • back-mirrored microspheres so-called Lüneburg lenses
  • angular reflectors so-called triple mirrors or cat's eyes
  • the surface of the printing form at least in the area in which the laser beam acts on the substrate, a higher adhesion for the ablated particles than the substrate.
  • the printing form for the ablated particles has a higher adhesiveness or a greater tack than the substrate, so that the ablated particles adhere to the surface of the printing plate and not to the substrate.
  • the printing form can have not only recesses in which the ablated particles collect, but also a higher adhesion or abradability for the ablated particles than the substrate.
  • the recesses have a higher adhesion to the ablated particles than the substrate, so that the ablated particles are not only collected in the recesses, but also at least temporarily fixed.
  • the coating of the cylinder is not or only slightly affected by the laser beam, changed in their properties or at least partially ablated, it is advantageous to use materials for the coating, which has the lowest possible absorption for electromagnetic radiation in the range of the wavelength show used laser beam or have a particularly good reflection for laser radiation of the wavelength used.
  • the ability of the cylinder or printing plate to collect the ablated particles is inevitably limited.
  • the recesses are filled with ablated particles or the adhesive surface is covered with ablated particles. Therefore, a cleaning device particularly preferably removes the ablated particles which have accumulated on the cylinder or printing form again from the surface of the cylinder or the printing forme.
  • This cleaning device preferably consists of a suction device which sucks the ablated particles from the cylinder by means of negative pressure.
  • a type of vacuum cleaner moves along the surface of the cylinder or the printing plate and absorbs the accumulated ablated particles, which has been replaced by the laser beam from the substrate or the printing plate.
  • the ablated particles can be detached from the cylinder or the printing form directly before the suction process by means of one of the following devices, so that they can be absorbed by the suction device with less energy or more effectively:
  • an overpressure device which ejects a gas or gas mixture, such as air, from a nozzle, the nozzle being aligned with the surface of the cylinder or the printing forme so that the gas flow directs the ablated particles from the cylinder or the printing plate in the direction to the suction device,
  • a mechanical cleaning device in which, for example, a rotating brush or a relative to the surface of the cylinder or the Druckf orm moving belt with a textile surface dissolves the ablated particles from the cylinder or the printing plate,
  • a liquid cleaning device in which, for example, a liquid jet, a liquid bath, a rotating brush with integrated liquid jet or a liquid-soaked strip dissolve the ablated particles from the cylinder or printing plate.
  • an electrostatic cleaning device dissolves the ablated particles from the cylinder or printing plate.
  • the ablated particles are either already electrostatically charged by the ablation or are electrostatically charged before they are removed from the cylinder or the printing plate by means of a device known from the prior art, for example a belt generator, a drum generator or an induction machine.
  • the drum, brush or belt of the electrostatic cleaning device is charged with the opposite electrostatic charge so that it attracts and holds the electrostatically charged ablated particles on its surface.
  • the cleaning device may continuously remove the ablated particles from the surface of the cylinder or printing plate, after each revolution, or after a slight accumulation of ablated particles on the surface of the cylinder or printing plate, after each n-turn. rotation, for example after every 5th, 10th or 20th revolution.
  • a sensor monitors the degree of contamination of the surface of the cylinder or of the printing form and activates the cleaning device when a predetermined limit value of the degree of contamination is exceeded.
  • a sensor monitors the contamination in the region of the laser marking on the substrate and activates the cleaning device, which then removes the ablated particles from the surface of the cylinder or the printing form.
  • the cleaning can take place both with and without substrate transport through the cylinder or the printing plate.
  • bores or apertures are introduced into the recesses in which the ablated particles collect. These holes or openings establish a connection between the respective recess and the hollow interior of the cylinder.
  • a negative pressure is applied to the recesses, which draws the ablated particles from the recess into the interior of the cylinder.
  • the negative pressure in the interior of the cylinder is temporarily not applied in the areas in which the laser marking takes place at the same time in order to avoid sucking the substrate into the recesses or recesses.
  • the negative pressure in the interior of the cylinder does not have to be switched off.
  • the coating has at least one recess and the impression cylinder has small holes.
  • the recess are also small holes, which are brought to the largest possible with the small holes of the impression cylinder in Pass réelle.
  • An appropriate control ensures that the abated particles are sucked in or sucked out of the cylinder via a negative pressure.
  • the vacuum is turned off.
  • the coating has at least one recess at least in the region in which the laser beam acts on the substrate.
  • the counter-pressure cylinder is charged electrostatically, so that the abiat convinced particles are temporarily fixed by electrostatic forces in the recesses or recesses.
  • the electrostatic charge is dissipated or neutralized, so that a discharge of the abated particles from the surface of the coating is made possible.
  • the device according to the invention for introducing the marking generates the recesses in the coating of the cylinder.
  • the coating or in a multilayer coating at least the top layer of the coating consist of a laser-sensitive material which is ablatierbar in the wavelength range of the laser beam from the coating.
  • the coating is preferably at least one two-day layer structure consisting of at least one laser-sensitive layer and a non-laser-sensitive support.
  • An example of such a coating is the standard blanket of the printing machine "Supernumerota" from KBA, which consists of a carbon-doped and thus laser-sensitive rubber layer and a white, non-laser-sensitive fabric cloth.
  • a file with the coordinates of the recesses is loaded into the control software of the device according to the invention for introducing the marking.
  • the device according to the invention integrated on the printing machine generates the recesses by ablating the laser-sensitive layer directly on the cylinder without substrate running.
  • the figures show schematically in: a device from the prior art for introducing laser marking onto a roll-shaped or web-shaped substrate,
  • Fig. 2 shows a device of the prior art for introducing a
  • Fig. 3 shows a detail of the cross section through an inventive
  • Cylinder with a recess a section of the cross section through a cylinder according to the invention with a recess and a support point in this recess
  • 5 shows a detail of the cross section through a cylinder according to the invention with a recess and a plurality of support points in this recess, which are arranged like a grid
  • FIG. 6 shows a section of the cross section through a cylinder according to the invention with a reflective or adhesive coating
  • FIG. 7 shows a detail of the cross section through a cylinder according to the invention with a recess and an adhesive coating at the bottom of the recess
  • FIG. 8 shows a cleaning device according to the invention in the form of a suction device, which sucks ablated particles or dirt from the surface of the cylinder,
  • FIG. 9 shows the cleaning device of FIG. 8 combined with a rotating brush which dissolves the ablated particles or dirt
  • FIG. 10 shows the cleaning device from FIG. 8 combined with an overpressure device which dissolves the ablated particles or dirt, the cleaning device from FIG. 10 combined with a further suction device, FIG.
  • Fig. 12 shows a cleaning device according to the invention in the form of a circulating belt which receives the ablated particles or dirt.
  • 3 shows schematically a section of the cross section through a cylinder 1 according to the invention.
  • This cross section is an enlargement of the cross section, as is also shown in FIGS. 1 and 2, wherein in FIG. 3 the area around the laser 3 and the Contact area 5, on which the substrate 2 rests on the cylinder 1, is shown enlarged.
  • the cylinder 1 is not arcuate in this and in all the following figures, but straight for the sake of simplicity.
  • the actually arcuate portion of the cylinder is thus shown simplified straight or bent to a straight line. Since curved sections for the limiting case opening angle ⁇ - * 0 merge into the tangent adjacent to them and thus into a straight line, this simplification does not constitute an impermissible restriction of the general public.
  • the cylinder 1 consists in this embodiment of a counter-pressure cylinder 7, on which a printing plate in the form of a pressure plate 8 is clamped instead of a known from the prior art blanket.
  • the substrate 2 for example, a security, a securities sheet or an endless belt from a paper roll.
  • a security is, for example, a banknote, a security sheet, for example a sheet of paper, on which several banknotes, so-called benefits, are printed side by side.
  • a printed image 10 is applied to the front, wherein in this printed image 10, a first laser mark is introduced.
  • a printed image 11 may preferably be applied, which corresponds to the printed image 10 in shape and color or represents another printed image.
  • a second laser mark is introduced.
  • no printed image can be applied to the substrate 2, i. neither on the front nor on the back, in which case the marking is applied or introduced directly onto the surface or into the volume of the substrate 2, for example by material transfer or material displacement, by blackening or by ablation of the substrate 2.
  • a laser 3 generates a laser beam 4 which impinges on the substrate 2 or the printed images 10 and 11 in the region 5. If the mark is introduced through the laser beam 4 into the print image 11 through the substrate 2, it is obvious that particles are flaked from the back of the substrate a, for example color particles of the print image 11. But also in the case that the laser beam 4 the Particles can be detached from the back of the substrate 2, for example, particles of the substrate 2 itself.
  • These ablated or detached particles are according to the embodiment of FIG. 3 in a recess 9 of the printing plate 8 so that they can not get back to the substrate 2 back.
  • the recess 9 acts as a kind of "collection container" for the ablated particles.
  • the substrate 2 bends in such a way in the recess 9, that the focus of the laser beam 4 is no longer at the desired or predetermined location of the Substrate 2 comes to rest.
  • the introduced mark appears in this case, for example, blurred or is introduced into a different layer depth of the substrate 2 as required.
  • the pressure plate 8 as shown in FIG. 4, a support point 12 which is arranged in the recess 9. On this support point 12, the substrate 2 is located on and is held by this, so that it can not bend into the recess 9. If a support point 12 alone is not sufficient, several support points can be arranged in the recess.
  • Fig. 5 shows a further embodiment in which on the surface of the pressure plate 8, a grid 13 is arranged by support points, which support the substrate.
  • a grid 13 is arranged by support points, which support the substrate.
  • the marking, which is to be introduced, for example, in the printed image 10 is not limited to the shape of the recess 9, but can take any shape.
  • Fig. 6 shows an embodiment in which a coating 14 is applied to the surface of the printing plate 8. This coating particularly preferably has a higher adhesion for the ablated particles than the substrate 2, so that the ablated particles adhere to the coating 14 and not to the substrate 2.
  • FIG. 7 shows a combination of the exemplary embodiments from FIG. 3 and FIG. 6.
  • a partial coating 15 is attached to the bottom of the recess 9, which, like the coating 14, particularly preferably has a higher adhesion to the ablated particles than the substrate 2 so that the ablated particles adhere to the coating 15.
  • the coating 14 or the partial coating 15 may be provided with retroreflective or diffusely reflecting elements Be provided that reflect the incident laser radiation accordingly.
  • FIG. 8 shows a cleaning device which sucks the ablated particles 16 collected on the pressure plate 8 out of the recess 9 by means of a suction device 17.
  • the suction device 17 is guided along the direction of movement 18 on the pressure plate and sucks, as soon as it encounters ablated particles 16, this on. If the ablated particles 16 are very firmly stuck in the recess 9 and therefore can only be detached from the suction device 17 with great difficulty, the ablated particles 16 are loosened or detached before they are subsequently sucked off by the suction device 17.
  • FIGS. 9 to 11 show exemplary embodiments for such loosening or detachment of the ablated particles 16 from the pressure plate 8.
  • FIG. 9 shows a rotating brush 19, by means of which the ablated particles 16 in the recess 9 are loosened or detached and swirled in the direction of the suction device 17.
  • the brush can of course also be in the running direction in front of the suction device.
  • a blowing device 20 carries an air jet or a liquid steel onto the ablated particles 16.
  • the detached or loosened ablated particles 21 are then sucked up by the suction device. If the blowing device 20 sprays a jet of liquid or water onto the ablated particles 16, then the suction device 17 draws in a mixture of liquid and loosened particles 21.
  • the embodiment of FIG. 11 shows the device of FIG. 10, which is supplemented by a further suction device 17. Both suction devices 17 receive the detached or loosened ablated particles 21 at the same time, so that the cleaning device can be guided over the surface of the pressure plate 8 or the recess 9 in a shorter time.
  • FIG. 11 may be particularly preferably adapted to the fact that the blowing device 20 is disposed within a suction device.
  • the blowing device 20 is completely surrounded by a suction device, with the exception of the exhaust opening itself, so that all ablated particles 16 are reliably sucked off, regardless of which direction they are loosened or blown away by the blowing device 20.
  • the blowing device 20 instead of the blowing device 20, to use one or more of the devices mentioned above or below for loosening or detaching the ablated particles 16.
  • FIG. 12 shows a cleaning device in the form of a circulating belt, which is guided over the ablated particles 16.
  • the surface of the band is in this case designed such that it not only ablates the ablated particles 16 from the recess 9, but also absorbs. This is done, for example, by electrostatic attraction between an electrostatically charged ribbon and oppositely charged ablated particles 16 or via an absorbent surface of the ribbon. Likewise, it is possible to impregnate the surface of the belt with a cleaning liquid which detaches the ablated particles 16, binds and is absorbed by the belt again.
  • the circulating belt in this case consists of a cleaning track, which is deflected by a cleaning roller 22. The cleaning roller 22 presses the tape against the ablated particles 16.
  • the clean cleaning path 23 in this case runs on the cleaning roller 22, dissolves the ablated particles 16 and takes them up.
  • the thus treated with the ablated particles 16 and thus soiled cleaning track 24 is away from the cleaning roller 22 and preferably a cleaning station, which frees the cleaning path of the ablated particles, recycled and fed as clean cleaning track 23 again the cleaning roller 22.
  • any other known from the prior art cleaning device can be used, which is adapted to remove the ablated particles 16 from the surface of the pressure plate 8.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Printing Plates And Materials Therefor (AREA)

Abstract

L'invention concerne un dispositif permettant d'appliquer un marquage sur et/ou dans un substrat (2), au moins un faisceau laser (4) agissant sur le substrat (2) et provoquant une modification du matériau du substrat ou de son revêtement sur au moins une des surfaces du substrat. Le substrat est guidé par un cylindre (1) monté de manière à pouvoir tourner, et le faisceau laser (4) agit sur le substrat pendant que le substrat se trouve au moins en partie en contact avec le cylindre (1). Selon l'invention, la surface du cylindre (1) qui est en contact avec le substrat (2) reçoit des particules (16) au moins par moments enlevées qui, sous l'effet du rayonnement laser, se détachent de la face du substrat (2) qui est en contact avec le cylindre (1), de sorte que les particules (16) enlevées ne peuvent pas adhérer à nouveau au substrat ou à un substrat suivant.
PCT/EP2012/003801 2011-09-15 2012-09-10 Dispositif permettant d'appliquer un marquage sur un substrat au moyen d'un faisceau laser WO2013037473A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011113508.5 2011-09-15
DE102011113508A DE102011113508A1 (de) 2011-09-15 2011-09-15 Vorrichtung zum Einbringen einer Markierung auf ein Substrat mittels Laserstrahl

Publications (1)

Publication Number Publication Date
WO2013037473A1 true WO2013037473A1 (fr) 2013-03-21

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PCT/EP2012/003801 WO2013037473A1 (fr) 2011-09-15 2012-09-10 Dispositif permettant d'appliquer un marquage sur un substrat au moyen d'un faisceau laser

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Country Link
DE (1) DE102011113508A1 (fr)
WO (1) WO2013037473A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014180885A1 (fr) 2013-05-10 2014-11-13 Fábrica Nacional De Moneda Y Timbre - Real Casa De La Moneda Procédé de fourniture d'une caractéristique de sécurité à un document de sécurité, et document de sécurité
EP3028869A1 (fr) 2013-06-26 2016-06-08 Fábrica Nacional de Moneda Y Timbre - Real Casa de la Moneda Procede de fourniture d'un document de securite avec une caracteristique de securite et document de securite
CN111479380A (zh) * 2020-04-26 2020-07-31 青岛歌尔智能传感器有限公司 电路板组件、打码偏移的检测方法及装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3787210A (en) * 1971-09-30 1974-01-22 Ncr Laser recording technique using combustible blow-off
EP1580015A1 (fr) * 2004-03-24 2005-09-28 Kba-Giori S.A. Procédé et appareil permettant d'effectuer un marquage d'identité sur documents de sécurité
EP1641627A1 (fr) 2004-06-17 2006-04-05 Kba-Giori S.A. Procédé et appareil pour créer des marques sur des papiers de sécurité
JP2007083541A (ja) * 2005-09-22 2007-04-05 Dainippon Printing Co Ltd 印刷版の清掃方法及び印刷機
EP2055478A2 (fr) * 2007-10-30 2009-05-06 manroland AG Système de production de structures tactiles sur des produits d'impression
EP2065213A2 (fr) * 2007-11-30 2009-06-03 OVD Kinegram AG Dispositif et procédé destinés à la fabrication d'une fenêtre dans un document de valeur ou un document sécurisé

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3787210A (en) * 1971-09-30 1974-01-22 Ncr Laser recording technique using combustible blow-off
EP1580015A1 (fr) * 2004-03-24 2005-09-28 Kba-Giori S.A. Procédé et appareil permettant d'effectuer un marquage d'identité sur documents de sécurité
EP1641627A1 (fr) 2004-06-17 2006-04-05 Kba-Giori S.A. Procédé et appareil pour créer des marques sur des papiers de sécurité
JP2007083541A (ja) * 2005-09-22 2007-04-05 Dainippon Printing Co Ltd 印刷版の清掃方法及び印刷機
EP2055478A2 (fr) * 2007-10-30 2009-05-06 manroland AG Système de production de structures tactiles sur des produits d'impression
EP2065213A2 (fr) * 2007-11-30 2009-06-03 OVD Kinegram AG Dispositif et procédé destinés à la fabrication d'une fenêtre dans un document de valeur ou un document sécurisé

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014180885A1 (fr) 2013-05-10 2014-11-13 Fábrica Nacional De Moneda Y Timbre - Real Casa De La Moneda Procédé de fourniture d'une caractéristique de sécurité à un document de sécurité, et document de sécurité
US9938667B2 (en) 2013-05-10 2018-04-10 Fábrica Nacional de Moneda y Timbre-Real Casa de la Moneda Method of providing a security document with a security feature, and security document
EP3028869A1 (fr) 2013-06-26 2016-06-08 Fábrica Nacional de Moneda Y Timbre - Real Casa de la Moneda Procede de fourniture d'un document de securite avec une caracteristique de securite et document de securite
CN111479380A (zh) * 2020-04-26 2020-07-31 青岛歌尔智能传感器有限公司 电路板组件、打码偏移的检测方法及装置
CN111479380B (zh) * 2020-04-26 2022-04-22 青岛歌尔智能传感器有限公司 电路板组件、打码偏移的检测方法及装置

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