EP4209354A1 - Procédé de fabrication d'un substrat polymère carbonisable avec marquage tactile en relief et substrat polymère sécurisé obtenu par ce procédé - Google Patents

Procédé de fabrication d'un substrat polymère carbonisable avec marquage tactile en relief et substrat polymère sécurisé obtenu par ce procédé Download PDF

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Publication number
EP4209354A1
EP4209354A1 EP22217005.2A EP22217005A EP4209354A1 EP 4209354 A1 EP4209354 A1 EP 4209354A1 EP 22217005 A EP22217005 A EP 22217005A EP 4209354 A1 EP4209354 A1 EP 4209354A1
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EP
European Patent Office
Prior art keywords
marking
laser
substrate
relief
power
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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.)
Pending
Application number
EP22217005.2A
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German (de)
English (en)
Inventor
Kamil GAWE
Robert Wojtkowski
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Polska Wytwornia Papierow Wartosciowych SA
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Polska Wytwornia Papierow Wartosciowych SA
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Application filed by Polska Wytwornia Papierow Wartosciowych SA filed Critical Polska Wytwornia Papierow Wartosciowych SA
Publication of EP4209354A1 publication Critical patent/EP4209354A1/fr
Pending legal-status Critical Current

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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
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/309—Photographs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/324—Reliefs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/41—Marking using electromagnetic radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/425—Marking by deformation, e.g. embossing

Definitions

  • the present invention relates to a method for the manufacture of a carbonizable polymer substrate with a tactile relief marking with an emboss effect, in particular a data carrier substrate for documents with security features, and a secured polymer substrate manufactured by this method having a tactile relief marking with an emboss effect.
  • Secured documents such as securities or identification documents confirming the existence of certain rights, legal relationships, or legal events expressed on specific information carriers, are currently an indispensable element of life in developed countries. Their importance is constantly increasing, as such documents find many applications and their number is constantly growing.
  • identification or security documents comprise a polymer substrate, a polycarbonate in particular, with at least one security marking selected from a wide range of available security features.
  • identification documents for example identification documents such as an identity card, driver's license or passport
  • first-level security features visible to the unaided eye
  • security features are generally used, such as guilloches, holograms, etc.
  • identity document should be broadly defined to include credit cards, bank cards, phone cards, passports, driver's licenses, network access cards, employee ID cards, debit cards, security cards, visas, immigration records, national ID cards, citizenship cards, social security cards, security badges, certificates, ID cards or identification documents, voter registration cards, police ID cards, border crossing cards, security clearance legal instruments, badges and cards, gun licenses, gift vouchers, membership cards or badges etc.
  • identity documents such as driving licences, ID cards, or bank or access cards
  • vital information that relates to the identity of the holder.
  • information include, for example, name, address, date of birth, signature and photograph; cards or documents may additionally contain other variable data (i.e. personal data for a specific card or document) and fixed data (i.e. data common to a large number of cards).
  • cards or documents may additionally contain other variable data (i.e. personal data for a specific card or document) and fixed data (i.e. data common to a large number of cards).
  • such documents can be provided with other elements, including those containing hidden information, and thus constituting second-level security, such as a photographic image or a bar code.
  • Such features may be applied by a variety of technologies including, but not limited to, printing using technologies such as dye diffusion thermal transfer (D2T2), inkjet printing, thermal transfer, laser xerography, offset printing, gravure printing, and indigo printing.
  • D2T2 dye diffusion thermal transfer
  • these printing techniques are not the only means of applying markings and information to data carriers for identity documents.
  • laser beams are commonly used for this purpose, in particular for marking, writing, barcoding and engraving many hard substrate materials, including plastic substrates. Lasers are used to create markings such as bar codes, date codes, part numbers, lot codes and company logos. It should be noted that laser engraving or marking offers a wide variety of surface modification options, including recording or engraving the surface of a document with identification marks, characters, text, tactile markings, patterns and photographs.
  • a particularly useful type of security features are laser engraved markings on plastic laminates or cards.
  • data is recorded by blackening (charring) such laser-sensitive and laser-markable laminated films, such as, for example, polyvinyl chloride (PVC) or polycarbonate (PC) films.
  • PVC polyvinyl chloride
  • PC polycarbonate
  • the laser engraving effect can be varied depending on the engraving depth. In the case of flat engraving, blackening is achieved only in the region of a certain layer. Another option is relief laser engraving for tactile marking.
  • markings on the thermoplastic material can be manufactured by several different mechanisms or combinations of engraving or laser marking mechanisms, depending on the specific material used, including, in particular, the additives used, the nature of any coloured pigments introduced into the thermoplastic material, or the laser energy characteristics to produce a variety of markings including light, dark or colour markings.
  • Polymers that have no or low tendency to carbonize such as polyolefins and high-density polyethylene (HDPE), can produce light markings due to foaming of the resin by the heat generated by the laser energy.
  • Other polymers such as polycarbonate (PC), ABS or polystyrene, show a much greater tendency to carbonization than foaming, and thus the markings applied are dark markings.
  • the document EP2851207B1 teaches, inter alia, of a document with a security feature on a polycarbonate substrate, the security feature being a laser-produced mark, for example with a beam length of 532 nm, consisting of a plurality of "pixels" forming such a mark.
  • the carbon particles of the polycarbonate substrate undergo a reaction under the influence of the laser, resulting in black pixels in places exposed to laser pulses. Depending on the number of laser pulses used, the size and shape of the resulting pixels may change.
  • US 2009/0127844 A1 discloses a security feature for secured papers, security documents and the like comprising a laser markable transparent or translucent layer in which, by the action of laser radiation, visually perceptible identifiers in the form of patterns, letters, numbers and/or pictures are introduced.
  • the patent document EP2918424B1 discloses a security document comprising printed data and a plurality of spaced microscopic bulges formed in a layer of laser markable material, at least some of the spaced microscopic bulges and printed data being mutually overlapped and at least some of the spaced microscopic bulges do not overlap the printed data, and the spaced microscopic bumps are arranged to form an image,
  • the resulting protrusions are dome-shaped due to the surface tension of the laser-heated plastic polymer after reaching the glass transition temperature.
  • the resulting protrusions do not reach the size desired for tactile markings, and with prolonged heating or increasing the laser power, they break, creating a depression in the surface of the PC in the place of a protrusion.
  • the present inventors have surprisingly found that, using standard RGB lasers, it is possible to obtain a high-quality image, in particular a bright-coloured tactile text, on easily carbonizable substrates, such as, in particular, polycarbonate (PC) substrates, which can be a tactile marking constituting a security feature of the document.
  • PC polycarbonate
  • standard markings were applied, such as, for example, markings in the form of a text analogous to dark markings applied as standard by laser engraving (for example, in a Polish identity card or a German driving license).
  • vector graphics e.g. a text
  • the best effects were obtained when a blue laser was used for marking.
  • the best visual effects were obtained using a green laser for engraving. This is most likely due to the specificity of raster graphics, in which a better effect is finally observed in the combination of tactile marking with a slight, delicate darkening of some grey levels of the convex bright marking.
  • the resulting marking provides a much higher degree of security provided by the marking obtained by the method of the present invention.
  • markings are applied to a polymer substrate by the method according to the invention, there is no possibility of introducing any additional information in the area of the applied marking.
  • the marking applied by the present method is applied in the volume of the substrate to be marked by laser treatment and it is an integral part of such substrate. Thus, it is a marking that is difficult to remove without interfering with the substrate itself.
  • any interference in the applied marking for example in the reproduced photograph, which was to cause its correction, would have to be associated with a change in the colour, i.e. the height of the applied protrusion, which is impossible on a previously modified surface.
  • Any additional interference in the structure of the applied marking results in its complete destruction.
  • a change requiring an alteration in the colour of specific areas of the modified substrate e.g. changing the reproduction of a photograph by correcting cheekbones, nose shape or even skin colour, is impossible.
  • the present invention provides a method for the manufacture of a tactile relief marking with an emboss effect on a carbonizable polymer substrate, in particular a data carrier substrate for documents with security features, in particular security documents with security features, the method comprising the step of:
  • the method of the present invention further comprises at least one, more preferably all, most preferably all of the following steps carried out in the order listed below:
  • relief corresponds to any raised, tactile structure constituting the security marking of a document, which can be perceived in particular under angle lighting.
  • the term "relief with an emboss effect” refers to such reliefs in which the protrusions differ in height and colour, providing the impression of depth of the document security marking also in transmitted light.
  • the maximum laser power that can be used for modifying the substrate without its degradation and determining the grey scale obtained in the range defined by such a maximum power of the laser used to apply the marking can be determined in any way, for example, by gradually increasing the laser power until, instead of the formation of protrusions, the destruction of the substrate by burning is observed.
  • the maximum laser power is considered to be the laser power at which protrusions of the maximum achievable height and brightness are formed in a repeatable manner. Based on the difference in colour of the highest protrusion and the surface of the modified substrate not subjected to laser treatment, the grey scale that can be achieved with the use of a specific laser operating at a specific frequency is determined, in which the marking will be applied to the substrate.
  • the power of the laser used to apply the relief marking with an emboss effect to the substrate is variable in the range from the minimum laser power to the maximum laser power at which there is no degradation of the substrate, in particular burn-through of the substrate, defined as 100 % of the maximum laser power, more preferably from 30 % of maximum laser power to 100 % of maximum laser power, more preferably 20 % of maximum laser power to 100 % of maximum laser power, most preferably 20 % of maximum laser power to 100 % of maximum laser power.
  • the maximum power of the laser used to apply the relief marking with an emboss effect to the substrate is in the range of 1000.00 mW to 8000.00 mW, more preferably in the range of 2500.00 mW to 5000.00 mW, most preferably is 3500.00 mW.
  • the frequency of the laser used to apply the relief marking with an emboss effect to the substrate does not exceed 100.00 kHz, more preferably does not exceed 50 kHz, most preferably is 50 kHz.
  • the relief marking with an emboss effect is applied over an area of no more than 12 by 12 mm, preferably no more than 10 by 10 mm.
  • the laser used to apply the relief marking with an emboss effect to the substrate is a green laser or a blue laser, preferably a green laser with a laser beam wavelength of 532 nm, or a blue laser.
  • the distance between the individual protrusions of the graphic image applied as a marking is equal to at least 0.4 of the radius of a single effective laser spot and is smaller than the radius of a single effective laser spot, preferably it is equal to at least half of the radius of a single effective laser spot and is less than 0.6 of the radius of a single effective laser spot.
  • the preferred substrate provided in the method of the invention in step b) to which the marking is applied is a polycarbonate or polyvinyl chloride substrate or a substrate coated with an additional polycarbonate or polyvinyl chloride protective layer, preferably a transparent polycarbonate or polyvinyl chloride protective layer. More preferably, the substrate is a polycarbonate substrate or a substrate coated with a transparent polycarbonate film.
  • the present invention also relates to a secured polymeric substrate bearing a tactile marking in the form of a relief with an emboss effect, in particular constituting a data carrier for documents with security features, especially security documents with security features, manufactured by the method of the present invention.
  • a preferred tactile marking in the form of a relief with an emboss effect as a security feature is a marking containing personal data and/or individualizing markings. More preferably, the tactile marking in the form of a relief with an emboss effect is a representation of a photograph, preferably a photograph of a document holder, such as an ID card, driver's license, admission card.
  • the present invention also provides a secured substrate for a document, which is a multi-layer document wherein at least the outer layer is a layer of a carbonizable material or a layer coated with a film of a carbonizable material, provided with a tactile marking in the form of a relief with an emboss effect manufactured by a method as set forth in any one of claims 1-9.
  • the present inventors surprisingly found out that due to the use of RGB or IR lasers, in particular commonly available RGB lasers, by controlling the power level of such a laser, in a single-stage method of modifying the polymer surface susceptible to carbonization, it is possible to obtain very precise marking of embossed character, containing many details and constituting an integral whole with the base, wherein this method additionally enables a significant improvement of the security level of the document provided with such protection due to the possibility of easy personalization of the marking obtained by the method according to the invention and the impossibility of any interference in the area on which the marking has been applied.
  • the present invention aims to satisfy the need to provide a relatively inexpensive and easily recognizable means for authenticating security documents on a polymer substrate, characterized by an increased degree of security, enabling easy personalization of documents provided with such security features in a simple, one-step process.
  • the present invention provides an effective, accessible and inexpensive security feature that is easy to process and incorporate along with other security features.
  • the terms "light” and “radiation” may be used interchangeably and mean a flux of emitted particles, for example emitted by a laser.
  • the terms “hue” and “shade” and “colour” are used interchangeably herein to denote different lengths of reflected light as perceived by an observer.
  • the grey-scale colours of the monochrome mode in the bitmap describing the applied marking include, apart from the extreme black and white colours, a whole range of intermediate colours (greys) with various levels of brightness.
  • intermediate colours that differ in brightness are considered to be different colours.
  • tone is to be understood as referring to the different intensity of the same colour.
  • tone is to be understood as referring to the different intensity of the same colour.
  • the term "substrate” should be interpreted broadly.
  • the substrate may be any single-layer substrate as well as a multi-layer laminate.
  • the substrate can be both a prefabricated product for the production of the target product, such as a single layer of a polymeric substrate, which, after marking, provides a protected polymeric substrate for further use, including incorporation into a multilayer system, in particular a permanently bonded multilayer substrate.
  • the substrate may also be a final product, such as an identification document containing at least one marking intended to convey information, such as, for example, an identity card or a driving license.
  • a "picture” or “marking” is generally understood to mean any visually and/or machine readable pattern, often comprising specific information, that can be captured by an observer in a normal, single act of cognition.
  • such patterns may be simple geometric patterns or textual and numerical information.
  • Such images or markings include realistic motifs as well as abstract motifs. Examples of realistic motifs are, in particular, photos, portraits, landscape, plant or animal motifs. Realistic motifs can also be images of coats of arms, buildings, flags.
  • Abstract motifs include all other graphically presentable markings, including in particular those that are specific patterns, signs, including trademarks, or codes. Other specific examples of abstract motifs are text or single letters or numbers.
  • the list of the above-indicated images is not exhaustive as such images or markings within the security feature can be laser engraved into any shape.
  • the attached figure shows the effects of laser marking of an easily carbonizable polymer substrate with a tactile marking with light and dark shades.
  • the bright protrusion effect was obtained due to the appropriate selection of laser parameters, sufficiently high power combined with the appropriate density of pixels.
  • the basic material for the tests was a PC card made in a symmetrical structure, consisting of transparent engravable films constituting outer layers with a thickness of 200 ⁇ m, and internal films, which comprised white polycarbonate films with a thickness of 400 ⁇ m.
  • Markings constituting personalizing security features were applied using a green laser (Coherent Matrix, 532 nm wavelength).
  • the application of the marking was preceded by designing, using a computer configured to design graphic images, a source image corresponding to the marking applied to the polymer substrate undergoing carbonization in the form of a relief with an emboss effect.
  • a set of input data defining the desired image constituting the applied marking as a raster graphic in the form of a two-dimensional array (matrix) of pixels was determined by computer, and then such designed input data was transformed by means of a computer configured to perform such a transformation into a code graphic file constituting a bitmap describing the mark to be applied.
  • the laser was computer controlled by adjusting the laser parameters based on the laser configuration data for each protrusion corresponding to a bitmap pixel.
  • optimal laser parameters were used to guarantee the best quality of the marking reproduced on the polymer substrate, in particular the image such as a photograph, using a laser with a wavelength of 532 nm, maximum power of 3.5 W.
  • This power corresponded to 100 % of the laser power at the frequency of laser pulses 50 kHz.
  • the spacing between pixels (adjacent dots - laser pulses) was set to 14 ⁇ m. This arrangement ensured that with an effective laser spot size of about 50 ⁇ m, adjacent points partially overlap.
  • the PC substrate is a polymer substrate that is easily carbonized, bright or at least brightened areas with convex, tactile markings were obtained.
  • the protrusions on the substrate which was a polymer card made of polycarbonate, are formed as a result of foaming of the material under the influence of laser treatment.
  • the laser power leads to a higher blackening of the laser-marked area, while reducing the protrusion, until reaching a state in which no protrusion is obtained.
  • the marking obtained in this way is tactile due to the protrusions located on at least part of the surface, providing the visual effect of embossing with a variable shade of grey.
  • the lowest levels of the grey scale i.e. representation of darker colours correspond to places where the marking elements were applied using a laser operating in the low power range, in particular in the range of 0 - 30 %, in particular 0-20 % of the maximum laser power.
  • the area corresponding to the brightest colours is much darker, and with optimal parameters, guaranteeing the desired accuracy of reflecting the applied image, its depth and readability was observed while maintaining excellent palpability.
  • a numerical value with the letter "k” corresponds to the applied laser frequency in kHz (as, for example, 50k represents a laser power of 50 kHz)
  • a numerical value with the symbol "%” corresponds to the applied laser power (such as 100 %)
  • the value ranges correspond to the changes in laser power in "%” that were used to apply the marking (such as 20-100)
  • the numerical value with the letter "u” corresponds to the distance in ⁇ m between adjacent pixels (like, for example, 14u).
  • Another card that was subject to personalization was a card made of white film without an additional external transparent "overlay" film.
  • effects similar to those obtained on cards with transparent film were not obtained.
  • the obtained marking does not have the desired embossed character, is obscure and lacks depth.
  • the image reflecting the photograph is free from the desired, tactile protrusions varied in terms of height, and in places where the laser power is high, we only get blackening.
  • the energy of the laser beam used to modify the substrate was increased, a slight ablation of the material was observed with simultaneous local blackening of the substrate in the area of the laser beam action.
  • the initial card was also tested at a changed laser operating frequency of 20 kHz. Satisfactory results were also obtained for such a low frequency. For the parameters of 100 % laser power used for marking the carbonizing polymer surface, frequency of 20 kHz, the most favourable spacing between adjacent pixels was 11 ⁇ m. For other parameters, worse results were obtained, as was in the case of the higher laser frequency of 50 kHz. However, on reducing the distance between adjacent pixels to 10 ⁇ m, the colour and shape of the "white protrusions" was more favourable than when reducing the distance between adjacent pixels for a frequency of 50 kHz. The colouring of the resulting image was also satisfactory.
  • Fig. 5 shows the pictures obtained with different steps of the laser power change.
  • the photograph on the left (a) was obtained using grey scales, where the lowest laser power (dark colours) corresponds to the use of a laser beam with a power of 30 % of the maximum laser power of 100 %, which is the maximum laser power responsible for obtaining bright colours in the applied raster graphics.
  • the image obtained in this way is convex, has the embossed character, and due to the use of a beam with maximum power that provides bright protrusions in the places of laser marking, bright "jump" marking is obtained.
  • the photograph shown in Fig. 5 B ) was taken in a similar way, based on the same source file, with the difference that the lowest laser power was 0.
  • the marking obtained with such a large span in laser power from 0 - 100 % is characterized by even more visually favourable effect, with the high depth of the image obtained and the detail of the marking applied to the substrate.
  • the marking representing an image obtained with a narrow laser power amplitude (30 - 100 %) is a grey-scale marking and with lower contrast than a marking obtained with a maximum laser power amplitude (0-100 %) contrast image, both in terms of colour/colour tone change differentiating the individual elements of the applied image, as well as the difference in the height of the obtained protrusions.
  • the security feature obtained by controlling the laser power based on the negative of the photograph not only enables the personalization of the document marked with such a marking, but it is legible, suitable for perception with two independent sense organs - sight and touch, and impossible to remove from the document without destroying it structure, and thus significantly increases its safety.
  • the marking obtained as described above with reference to Fig. 5 b) , is shown in Fig. 6 in views for different lighting variants. Regardless of the angle of incidence of light revealing the marking, it has a clear embossed character, perfectly reflects fine details of the image applied on the basis of the source file, it is easily perceived with the naked eye, and at the same time it is perfectly tactile.
  • the high degree of accuracy of the marking detail mapping is visible in the magnification of the image in Fig. 7 , applied to the substrate based on the negative of the image, in the right side illumination.
  • This magnification shows a perfect reflection of protrusions obtained in the document personalization process proposed in the present method.
  • the marking made in the original size, 10 mm high reflects the details well enough to easily identify the person presented in the reproduced photograph. It should be emphasized that the small size of the applied markings provides an excellent visual effect, which is related to a better ratio of the amplitude of the protrusions to the entire modified area.
  • the photograph can be resize any arbitrary way.
  • the height of the protrusions i.e.
  • the distance of the point on the protrusion surface that is maximally removed from the plane of the modified substrate is at a constant level, for the given substrate parameters (its type) and the laser used for its modification (power, frequency) and the grid density of the applied pixels (where a single pixel in the source file corresponds a single protrusion on the surface of the modified substrate).
  • the height of the protrusions to the size of the photograph, it is possible to obtain very favourable effects at small sizes of the applied images.
  • Particularly favourable effects and the quality of mapping the applied image were obtained with the size of the markings, height and width, within the range of 10 - 12 mm.
  • the protrusion height of the laser engraving is constant, regardless of the size of the graphics. Its height can be adjusted only with a laser power, but depending on the selection of this parameter, we also get a different colour shade (colour).
  • colour shade colour
  • the highest protrusions were obtained for a bright colour, and when the power was reduced, the protrusion was reduced, but also an increasingly darker colouration of the laser-modified area was observed.
  • the heights of individual protrusions obtained in this method measured in relation to the surface of the card, ranged from 0.15 - 0.2 mm in the highest spot and were observed as the brightest elements of the marking. Darker coloration was observed at lower laser powers, and the height of the protrusions corresponding to these areas ranged from 0.5 - 0.15 mm.
  • Protrusion surfaces are formed as a result of foaming of the material, however, due to the overlapping of pixels in the source image, corresponding to the places of laser processing, the surface created with the same laser parameters is almost smooth, and the heights of the resulting protrusions differ slightly.
  • the markings were applied to the substrate using a laser with different parameters.
  • the personalizing markings obtained are shown in Fig. 10 , which shows a general view of the initial card (base material) with images constituting representation of a photograph, obtained for different settings of the green laser and different graphical representations of the photograph.
  • the best marking effects enabling the use of the method for repeated personalization of a document with a high legibility marking, are provided by the use of raster graphics, with the best effects being obtained in the range of large differences in the laser power amplitude (g).
  • illegible marking is obtained when the pixel density is significantly increased so that the distance between adjacent pixels is less than the average radius of a single pixel, as air bubbles are formed in the graphics (Fig. 10 f).
  • Fig. 11 The influence of the laser power on the marking obtained is shown in Fig. 11 .
  • the obtained tactile personalization mark made with a lower power laser does not provide such good results due to the reduced value of the laser power amplitude used for image application.
  • the method proposed by the present inventors provides the possibility of full personalization of the applied marking functioning as a security feature, made with high precision and accuracy of reproduction, being a tactile marking, and at the same time having the embossed character.
  • the method proposed by the present inventors provides the possibility of full personalization of the applied marking functioning as a security feature, made with high precision and accuracy of reproduction, being a tactile marking, and at the same time having the embossed character.
  • security features which are highly detailed, easily recognizable to the naked eye, including personalization elements such as a reproduction of a photograph of the document's holder.
  • Such protection is quick and easy to implement, it does not require any costly operations, and the protected polymer substrate obtained in accordance with the invention, provided with a marking acting as a security feature, is very durable and stable.
  • Removing the marking requires degradation of the surface on which it is applied, and thus is tantamount to destruction of the security document bearing such a security feature.
  • the markings due to the possibility of applying the markings with a laser controlled by a computer adapted for this purpose and using graphic files defining the form of the applied markings as source files, it is possible to personalize the marked documents with more complex images, including images reflecting the image of the holder of a document secured by such a marking.
  • the solution provided by the present inventors although relatively easy and inexpensive to implement, is characterized by a very universal character and many different applications, including in particular for the manufacture of personalization elements in the area of the security feature of security documents on carbonizable polymer substrates, especially PC substrates.

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EP22217005.2A 2021-12-29 2022-12-28 Procédé de fabrication d'un substrat polymère carbonisable avec marquage tactile en relief et substrat polymère sécurisé obtenu par ce procédé Pending EP4209354A1 (fr)

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PL440023A PL440023A1 (pl) 2021-12-29 2021-12-29 Sposób wytwarzania podłoża polimerowego ulegającego karbonizacji opatrzonego wyczuwalnym w dotyku oznakowaniem w postaci reliefu z efektem płaskorzeźby, oraz wytworzone tym sposobem zabezpieczone podłoże polimerowe

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EP4209354A1 true EP4209354A1 (fr) 2023-07-12

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EP22217005.2A Pending EP4209354A1 (fr) 2021-12-29 2022-12-28 Procédé de fabrication d'un substrat polymère carbonisable avec marquage tactile en relief et substrat polymère sécurisé obtenu par ce procédé

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EP2851207B1 (fr) 2013-07-25 2015-12-30 Oberthur Technologies Personnalisation de documents
EP2918424B1 (fr) 2014-03-13 2020-07-22 Entrust Datacard Corporation Document de sécurité avec une caractéristique de sécurité d'image d'arrière-plan et méthode

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