EP2284019A1 - Papier sécurisé pour la gravure au laser, document sécurisé et procédé pour la fabrication de documents sécurisés - Google Patents

Papier sécurisé pour la gravure au laser, document sécurisé et procédé pour la fabrication de documents sécurisés Download PDF

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Publication number
EP2284019A1
EP2284019A1 EP09460025A EP09460025A EP2284019A1 EP 2284019 A1 EP2284019 A1 EP 2284019A1 EP 09460025 A EP09460025 A EP 09460025A EP 09460025 A EP09460025 A EP 09460025A EP 2284019 A1 EP2284019 A1 EP 2284019A1
Authority
EP
European Patent Office
Prior art keywords
laser
security
paper
antimony
tin oxide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP09460025A
Other languages
German (de)
English (en)
Other versions
EP2284019B1 (fr
Inventor
Joanna Gurtowska
Ewelina Jakielaszek
Marzena Sadecka
Slawomir Ziólkowski
Daniel Mierzejewski
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Polska Wytwornia Papierow Wartosciowych SA
Original Assignee
Polska Wytwornia Papierow Wartosciowych SA
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 Polska Wytwornia Papierow Wartosciowych SA filed Critical Polska Wytwornia Papierow Wartosciowych SA
Priority to PL09460025T priority Critical patent/PL2284019T3/pl
Priority to LTEP09460025.1T priority patent/LT2284019T/lt
Priority to EP09460025.1A priority patent/EP2284019B1/fr
Priority to ES09460025.1T priority patent/ES2581655T3/es
Publication of EP2284019A1 publication Critical patent/EP2284019A1/fr
Application granted granted Critical
Publication of EP2284019B1 publication Critical patent/EP2284019B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/28—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using thermochromic compounds or layers containing liquid crystals, microcapsules, bleachable dyes or heat- decomposable compounds, e.g. gas- liberating
    • B41M5/282—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using thermochromic compounds or layers containing liquid crystals, microcapsules, bleachable dyes or heat- decomposable compounds, e.g. gas- liberating using thermochromic compounds
    • B41M5/283—Inorganic thermochromic compounds

Definitions

  • the invention relates to a security paper for laser engraving, a security document and a method for making security documents.
  • Security documents may comprise various security features, such as watermarking, microlettering, raised print etc.
  • the security features may be common to all documents of specific type or, preferably, may form personalization markings, i.e. document-individual markings.
  • Laser engraving is one of the techniques to make markings on security documents.
  • Various attempts have been made to achieve efficient laser engraving of paper-based documents.
  • a European patent application EP07460036 discloses a paper for personal document sheets, which is coated with a coating mixture containing a pigment, which subjected to laser beam changes color to a contrasting color in relation to the background paper color.
  • Such paper may have personalization markings made thereon by laser engraving, where the laser activates the pigment in the coating.
  • the aim of the present invention is to provide an improved security paper for laser engraving, a security document comprising the security paper and a method for making security documents, providing improved legibility and clarity of laser-engraved markings.
  • the object of the invention is a security paper for laser engraving, comprising a paper substrate layer comprising an antimony-doped tin oxide laser-marking pigment and titanium white, the paper substrate layer being coated with a coating layer comprising the antimony-doped tin oxide laser-marking pigment, such that when the security paper is subject to a laser beam, the antimony-doped tin oxide laser-marking pigment causes change of color of the security paper both within the paper substrate layer and the coating layer.
  • the antimony-doped tin oxide laser-marking pigment comprises from 95% to 99% by weight of tin oxide (SnO 2 ) and from 1% to 5% by weight of antimony oxide (Sb 2 O 3 ).
  • titanium white comprises rutile form of titanium dioxide (TiO 2 ).
  • the paper substrate layer comprises from 2,5% to 10%, preferably 5%, by weight of the antimony-doped tin oxide laser-marking pigment.
  • the paper substrate layer comprises from 2,5% to 10%, preferably 3,5%, by weight of titanium white.
  • the coating layer comprises from 0,5% to 3%, preferably 2%, by weight of the antimony-doped tin oxide laser-marking pigment.
  • the concentration of the antimony-doped tin oxide laser-marking pigment in the paper substrate layer increases towards the side of the paper substrate layer coated by the coating layer comprising the antimony-doped tin oxide laser-marking pigment coating.
  • Another object of the present invention is a security document comprising the security paper according to the invention and comprising laser-engraved markings having increased visibility in transmitted light, made by activating the antimony-doped tin oxide laser-marking pigment in the coating layer and in the paper substrate layer by laser beam.
  • the laser-engraved markings are raised.
  • the laser-engraved markings comprise microlettering.
  • at least part of the laser-engraved markings are of different shades.
  • Another object of the present invention is a method for making security documents, comprising the steps of providing a security paper according to the invention and making markings having increased visibility in transmitted light by laser engraving the security paper by activating the antimony-doped tin oxide laser-marking pigment in the coating layer and in the paper substrate layer by laser beam.
  • the method comprises the step of laser engraving the security paper with a first set of laser beam parameters so as to obtain raised markings.
  • the method comprises the step of laser engraving the security paper with a second set of laser beam parameters so as to obtain microlettering markings.
  • the method comprises the step of varying the laser beam parameters so as to obtain markings of different shades.
  • a security paper for laser engraving according to the invention has a structure shown in Fig. 1 .
  • the paper 100 comprises a paper substrate layer 110 which is coated with a coating layer 120.
  • the paper substrate layer 110 comprises an antimony-doped tin oxide laser-marking pigment and titanium white.
  • the coating layer 120 comprises the antimony-doped tin oxide laser-marking pigment.
  • Fig. 1 shows the paper substrate layer 110 covered by the coating layer 120 from one side only, but the paper substrate layer 110 may be covered by the coating layer 120 from both sides as well.
  • the antimony-doped tin oxide laser-marking pigment is an absorber, which locally absorbs laser energy and transforms it into thermal energy, causing change of color, such as darkening, of the material in which the pigment is contained. Therefore, when the security paper 100 is subject to a laser beam, the antimony-doped tin oxide laser-marking pigment causes change of color of the security paper 100 both within the paper substrate layer 110 and the coating layer 120.
  • Titanium white allows for increasing the contrast of the laser-engraved markings with respect to the background color of the paper substrate, for example white color. Moreover, use of titanium white results in achieving laser-engraved markings in shades of grey, which have been found to be less susceptible to bleaching as compared to sepia-shaded markings.
  • the antimony-doped tin oxide laser-marking pigment may comprise from 95% to 99% by weight of tin dioxide (SnO 2 ) and from 1% to 5% by weight of antimony oxide (Sb 2 O 3 ). Such pigment allows achieving particularly legible and clear laser-engraved markings.
  • Titanium white may comprise rutile form of titanium dioxide (TiO 2 ).
  • the paper substrate layer may comprise conventional fibres and additives, and in addition preferably from 2,5% to 10%, preferably 5%, by weight of the antimony-doped tin oxide laser-marking pigment, and from 2,5% to 10%, preferably 3,5%, by weight of titanium white.
  • the coating layer may be made of a conventional coating mixture based on polyvinyl alcohol, which further comprises from 0,5% to 3%, preferably 2%, by weight of the antimony-doped tin oxide laser-marking pigment.
  • the antimony-doped tin oxide laser-marking pigment may be applied to the external layer of the paper web which is to be covered by the coating layer 120. Then, the concentration of the antimony-doped tin oxide laser-marking pigment in the paper substrate 110 increases towards the side of the paper substrate 110 coated by the coating layer 120 comprising the antimony-doped tin oxide laser-marking pigment. This allows more efficient production of raised markings.
  • the security paper according to the invention may be used to produce various personalized security documents, such as passports, visas, communication documents, marriage status documents, as well as non-personalized security documents, such as banknotes or excise duty documents.
  • Fig. 2 shows a structure of a security document 200 comprising the security paper according to the invention.
  • the security document 200 comprises markings 231, 232, 233, which can be personalization markings or general security markings, and which are made by activating by laser beam the antimony-doped tin oxide laser-marking pigment in the coating layer 220 and in the paper substrate layer 210. Due to the fact that the markings are present in both layers 210, 220 of the paper, they have increased visibility in transmitted light, similarly to a watermark, thereby forming a security feature of the document.
  • At least part 234 of the laser-engraved markings 233 may be raised above the surface of the coating layer 220. Raised markings provide further security features of the document, as well as allow identification of the marking by vision-impaired persons.
  • the raised markings 234 may be achieved by using higher laser beam power, as explained below.
  • the laser-engraved markings 232 may comprise microlettering, i.e. a string of characters having a small font size, as small as about 0,5 mm in height. Microlettering may also form a security feature of the document. Microlettering 232 markings and other high-quality vector graphics may be achieved by using moderate laser power and relatively low laser beam speed.
  • the laser-engraved markings 231 may have different shades. This allows laser-engraving of images with shade-variable background, such as stamps, which may constitute an important security feature of the document. Shade-variable backgrounds 231 may be achieved by varying laser beam power and speed.
  • the security document according to the invention may be made by providing a security paper 100 according to the invention and laser engraving the security paper 100 by activating by laser beam the antimony-doped tin oxide laser-marking pigment in the coating layer 120 and in the paper substrate layer 110.
  • an Nd:YAG 1064 nm laser is used for activating the antimony-doped tin oxide laser-marking pigment.
  • the impulse duration of the laser is set to 15ns.
  • the following laser beam parameters may be used: impulse power from 1,2*10 14 to 1,8*10 14 [prosz e poda ⁇ jednostk miary], speed 20000 mm/s, impulse frequency from 700 to 1500 Hz.
  • the shade of the marking may be varied by varying the impulse power and frequency: the higher the impulse power and frequency, the darker the shade of the obtained marking.
  • the following laser beam parameters may be used: impulse power from 1,1*10 14 to 1,4*10 14 [prosz poda ⁇ jednostk miary], speed from 30 to 60 mm/s, impulse frequency 1500 Hz.
  • the following laser beam parameters may be used: impulse power from 2,2*10 14 to 2,4*10 14 [proszq poda ⁇ jednostk miary], speed from 50 to 160 mm/s, impulse frequency 1500 Hz.
  • impulse power from 2,2*10 14 to 2,4*10 14 [proszq poda ⁇ jednostk miary]
  • speed from 50 to 160 mm/s
  • impulse frequency 1500 Hz A higher impulse power leads to higher amount of absorbed energy by the antimony-doped tin oxide laser-marking pigment and raising of marking above the surface of the coating layer.

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Paper (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Laser Beam Processing (AREA)
EP09460025.1A 2009-06-22 2009-06-22 Papier sécurisé pour la gravure au laser, document sécurisé et procédé pour la fabrication de documents sécurisés Active EP2284019B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PL09460025T PL2284019T3 (pl) 2009-06-22 2009-06-22 Papier zabezpieczony do grawerowania laserowego, dokument zabezpieczony i sposób wytwarzania dokumentów zabezpieczonych
LTEP09460025.1T LT2284019T (lt) 2009-06-22 2009-06-22 Apsauginis popierius lazeriniam graviravimui, saugus dokumentas ir apsaugos gavimo būdas
EP09460025.1A EP2284019B1 (fr) 2009-06-22 2009-06-22 Papier sécurisé pour la gravure au laser, document sécurisé et procédé pour la fabrication de documents sécurisés
ES09460025.1T ES2581655T3 (es) 2009-06-22 2009-06-22 Papel de seguridad para grabado con láser, documento de seguridad y método para la fabricación de documentos de seguridad

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09460025.1A EP2284019B1 (fr) 2009-06-22 2009-06-22 Papier sécurisé pour la gravure au laser, document sécurisé et procédé pour la fabrication de documents sécurisés

Publications (2)

Publication Number Publication Date
EP2284019A1 true EP2284019A1 (fr) 2011-02-16
EP2284019B1 EP2284019B1 (fr) 2016-04-13

Family

ID=41510513

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09460025.1A Active EP2284019B1 (fr) 2009-06-22 2009-06-22 Papier sécurisé pour la gravure au laser, document sécurisé et procédé pour la fabrication de documents sécurisés

Country Status (4)

Country Link
EP (1) EP2284019B1 (fr)
ES (1) ES2581655T3 (fr)
LT (1) LT2284019T (fr)
PL (1) PL2284019T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014002014A2 (fr) 2012-06-26 2014-01-03 Arjowiggins Security Element en feuille engravable par laser
GB2535884A (en) * 2015-02-25 2016-08-31 Inovink Ltd Improvements in relation to security printing

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0415478A2 (fr) * 1989-09-01 1991-03-06 METALLGESELLSCHAFT Aktiengesellschaft Pigment de rutile à phase mixtes conducteur d'électricité, procédé de fabrication et utilisation
DE4103231A1 (de) * 1991-02-02 1992-08-06 Metallgesellschaft Ag Elektrisch leitfaehiges pigment und verfahren zu seiner herstellung
US5484694A (en) * 1994-11-21 1996-01-16 Eastman Kodak Company Imaging element comprising an electrically-conductive layer containing antimony-doped tin oxide particles
JPH09249820A (ja) * 1996-03-15 1997-09-22 Titan Kogyo Kk 白色導電性粉末及びその製造方法
US5677039A (en) * 1992-04-07 1997-10-14 Arjo Wiggins S.A. Antistatic sheet
DE102004027306A1 (de) * 2004-06-04 2005-12-22 Giesecke & Devrient Gmbh Wertdokument
WO2006045567A2 (fr) * 2004-10-25 2006-05-04 Merck Patent Gmbh Utilisation de corps moules constitues de particules a noyau et enveloppe
DE102006057507A1 (de) * 2006-12-06 2008-06-12 Merck Patent Gmbh Optisch variables Sicherheitselement

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0415478A2 (fr) * 1989-09-01 1991-03-06 METALLGESELLSCHAFT Aktiengesellschaft Pigment de rutile à phase mixtes conducteur d'électricité, procédé de fabrication et utilisation
DE4103231A1 (de) * 1991-02-02 1992-08-06 Metallgesellschaft Ag Elektrisch leitfaehiges pigment und verfahren zu seiner herstellung
US5677039A (en) * 1992-04-07 1997-10-14 Arjo Wiggins S.A. Antistatic sheet
US5484694A (en) * 1994-11-21 1996-01-16 Eastman Kodak Company Imaging element comprising an electrically-conductive layer containing antimony-doped tin oxide particles
JPH09249820A (ja) * 1996-03-15 1997-09-22 Titan Kogyo Kk 白色導電性粉末及びその製造方法
DE102004027306A1 (de) * 2004-06-04 2005-12-22 Giesecke & Devrient Gmbh Wertdokument
WO2006045567A2 (fr) * 2004-10-25 2006-05-04 Merck Patent Gmbh Utilisation de corps moules constitues de particules a noyau et enveloppe
DE102006057507A1 (de) * 2006-12-06 2008-06-12 Merck Patent Gmbh Optisch variables Sicherheitselement

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014002014A2 (fr) 2012-06-26 2014-01-03 Arjowiggins Security Element en feuille engravable par laser
GB2535884A (en) * 2015-02-25 2016-08-31 Inovink Ltd Improvements in relation to security printing
WO2016135452A1 (fr) * 2015-02-25 2016-09-01 Inovink Limited Perfectionnements apportés à l'impression de sécurité
GB2535884B (en) * 2015-02-25 2018-05-09 Inovink Ltd Improvements in relation to security printing
US10259255B2 (en) 2015-02-25 2019-04-16 Inovink Limited Security printing

Also Published As

Publication number Publication date
PL2284019T3 (pl) 2017-03-31
EP2284019B1 (fr) 2016-04-13
LT2284019T (lt) 2016-09-12
ES2581655T3 (es) 2016-09-06

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