WO1995009276A1 - Ameliorations relatives aux caracteristiques de securite du papier - Google Patents

Ameliorations relatives aux caracteristiques de securite du papier Download PDF

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Publication number
WO1995009276A1
WO1995009276A1 PCT/GB1994/002030 GB9402030W WO9509276A1 WO 1995009276 A1 WO1995009276 A1 WO 1995009276A1 GB 9402030 W GB9402030 W GB 9402030W WO 9509276 A1 WO9509276 A1 WO 9509276A1
Authority
WO
WIPO (PCT)
Prior art keywords
paper
resin
composition
transparentising
sheet
Prior art date
Application number
PCT/GB1994/002030
Other languages
English (en)
Inventor
Paul Howland
Original Assignee
Portals Limited
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 Portals Limited filed Critical Portals Limited
Priority to AU76223/94A priority Critical patent/AU7622394A/en
Publication of WO1995009276A1 publication Critical patent/WO1995009276A1/fr

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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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/24—Addition to the formed paper during paper manufacture
    • D21H23/26—Addition to the formed paper during paper manufacture by selecting point of addition or moisture content of the paper
    • D21H23/28—Addition before the dryer section, e.g. at the wet end or press section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/10—Watermarks
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/44—Watermarking devices
    • 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

Definitions

  • the invention relates to improvements in security features in paper and in particular to a method of making paper and transparentising selected areas of paper to provide enhanced security features.
  • a photo- copying process typically involves reflecting high energy light off an original document containing the image to be copied
  • one solution is to incorporate one or more features into the document which have a different perception in reflected and transmitted light.
  • security features include watermarks, embedded security threads, luminescent pigment and the like.
  • EP-A2-0203499 discloses a method of applying a pseudo watermark to paper. This method comprises the preparation of a paper containing thermally sensitive material, the presence of which renders the translucency of the paper variable by temperature change. When heat is subsequently applied to a part of the surface of the paper, a region of the paper becomes semi-translucent.
  • US-A-2021141 discloses a method of applying pseudo watermarks to paper, by applying a resinous composition to finished paper which permeates the paper and causes it to become more transparent, or translucent, than the surrounding area.
  • GB-A-1489084 describes a method of producing a simulated watermark in a sheet of paper.
  • the sheet is impregnated in the desired watermark pattern with a transparentising composition which, when submitted to ultra violet radiation, polymerizes to form a simulated watermark.
  • US-A-5118526 describes a method of producing simulated watermarks by applying heat, in the desired watermark pattern, onto a thin solid matrix of waxy material placed in contact with a sheet of paper. This results in an impression of a durable translucent watermark.
  • US-A-4513056 relates to a process for rendering paper either wholly or partially transparent by impregnation in a special bath of a transparentisation resin and subsequent heat cross-linking of the resin.
  • EP-A1-0388090 describes a method of combining a see-through or print-through feature with a region of paper which has a substantially uniform transparency which is more transparent than the majority of the remainder of the sheet.
  • JP 61-41397 discloses a method for making paper transparent and a method for its manufacture for see-through window envelopes. The method utilises the effect of causing ink cross-linked by ultra-violet rays to permeate paper thus causing that part of the paper to become transparent.
  • the sizing and calendering processes help to reduce the porosity of the paper.
  • Finished paper treated in this way does not lend itself to transparentisation because its low absorbency inhibits the penetration of the transparentising resin, and, in the case of UV cured resins or those requiring a hot drying process, the moisture content of the paper is disturbed and this is likely to cause print runability problems at the printing stage.
  • EP-A-0 493 231 describes a printable sheet for manufacture of security documents having at least one iridescent coating situated at least partially on the surface of the sheet.
  • the coating composition is made up from at least one binder, such as polyvinylchloride, and an iridescent substance which coating is applied to the finished paper.
  • FR-A-2641011 also discloses a printable sheet and includes on its surface a layer made up of at least one iridescent substance.
  • the layer is deposited on the finished paper by a gravure printing process using an ink made up of a varnish and of an iridescent substance.
  • EP-A-0 490 825 also describes security paper which has a superficial colour coat made up of at least two adjoining surface areas in the form of strips.
  • the coat strips contain different iridescent pigments and exhibit a different colour when viewed from at least one oblique viewing angle range.
  • the prior art methods of applying iridescent coatings are only suitable for use with finished papers which have been treated to make them non-absorbent, low porosity papers.
  • security documents emcompasses bank notes, cheques, passports, identification cards, share certificates, vouchers, coupons, tickets and the like.
  • fluorescent substance is understood to refer to a substance which, due to the interference of light reflected from the front and back of a thin film, shows changes of colour on the surface.
  • Figure 1 is a schematic section through apparatus used in a method of manufacturing paper according to the invention
  • Figure 2 is a schematic section through alternative paper making apparatus for use in the method of manufacturing paper according to the invention
  • Figure 3 is a perspective view of the rotary screen printer of Figure 1;
  • Figure 4 is a schematic representation of a security document made from paper according to the invention.
  • FIG. 5 is a schematic representation of an alternative security document made from paper according to the invention.
  • Figure 6 is a cross-sectional side elevation of an enlarged portion of the document of Figure 4 on the line VI-VI.
  • a cylinder mould paper making machine 10 comprises a vat 11 containing paper stock, i.e. a suspension of paper making fibres 12. The major portion of a horizontal cylinder mould 13 dips into the vat 11.
  • the surface of the cylinder 13 is provided by a wire mesh which may be embossed and generally there are several layers of mesh employed, the outermost being the finest. Liquid is drawn through the mesh as the cylinder 13 is rotated causing paper making fibres to deposit on the mesh and form wet paper 14. The wet paper 14 is couched from the cylinder by couch roll 15 and conveyed away on a moving wire mesh 16.
  • the wet paper 14 then passes through a wet press 17 which squeezes the paper 14 to remove excess water therefrom.
  • the paper 14 is then dried over heated cylinders 19.
  • the paper forming process can be achieved in many other ways.
  • the most common alternative is the Fourdrinier system shown in Figure 2.
  • this paper making fibre stock is deposited from a stock applicator or flow box 30 on to a continuous moving wire mesh 31. Water from the fibre stock drains through the wire mesh 31 leaving a wet de-watered fibre mat 32.
  • the fibre mat 32 passes under a dandy roll 33 which can be used to apply an embossed watermark.
  • the wet paper then passes through a wet press 34 before being dried.
  • the paper In a traditional paper making process the paper is impregnated with any one of a variety of sizing resins such as polyvinylalcohol (PVOH) or gelatin, to minimise the uptake of oily substances or organic solvents.
  • PVOH polyvinylalcohol
  • gelatin gelatin
  • the paper sheet 14 is passed through a size bath 18 so that it becomes saturated with size. The resulting paper is thus resistant to grease and has a lower absorbency and it is therefore more appropriate for use as banknote paper and the like.
  • the paper sheet 14 is then passed through an air float, spar or other suitable dryer 20 for further drying before passing to a calendering device 21 to give a smooth surface before reeling 22.
  • a screen printing process or other resin applicator is used to apply a transparentising resin containing an iridescent substance to the surface of the partially formed paper sheet 14 before it enters the size bath 18.
  • the screen printer 23 is a rotary printer comprising a cylindrical screen 23 of flexible wire mesh mounted on a rigid steel rim covered by a stencil 24. The image required to be reproduced on the paper is formed in the stencil by means of an opening 25. As the paper sheet 14 passes the cylinder, the transparentising resin 26 is applied to the inside of the wire mesh and forced through the mesh with a squeegee blade 27 onto the paper sheet 14.
  • Some papers may be more appropriately treated by a gravure, flexo or other printing process, instead of the screen printing process.
  • the transparentising resin applied by the printing process is applied in the quantity of at least 5% by weight of resin to the partially formed paper sheet.
  • the resin is applied in the quantity of at least 10% by weight of resin.
  • the partially formed paper is at its most absorbent, thus allowing good penetration of the transparentising resin.
  • no curing process is used, and the sheet 14 is passed directly into the size bath 18. This prevents smudging of the mobile transparentising resin which is effectively frozen in position. This is an unexpected effect.
  • the size fills the cells in the paper surrounding those containing the transparentising resin, thus preventing migration of the latter.
  • the transparentising resin can thus be applied to a sharply defined region of the paper so as to create a transparent patch or pattern that is capable of contributing to the overall resistance to counterfeiting of a security document made from the paper.
  • the security document may be a banknote, a cheque, a passport, an identification card, a share certificate or the like.
  • FIG. 4 shows a sharply defined translucentized area 28. It should be noted that a transparentised area without the iridescent substance does not reflect as much light as the non-transparentised paper. Therefore the outline of the transparentised patch can be seen reasonably well in reflected light.
  • the resin can be "fixed" by using EB or UV radiation cured resins whereby curing takes place shortly after application and prior to entry of the sheet 14 into the size bath 18.
  • EB or UV radiation cured resins whereby curing takes place shortly after application and prior to entry of the sheet 14 into the size bath 18.
  • the processing space between the printer 23 and size bath 18 can be limited; in an alternative embodiment of the invention the resin is cured after the partially formed sheet 14 has passed through the dryer 20 and before the calendar 21.
  • a short pre-cure can take place prior to entry of the paper into the size bath 18. This enables the surface of the resin to be cured to prevent the transfer from taking place, whilst the rest of the resin within the body of the paper is not "fixed” until after the sizing process has taken place.
  • the radiation cross-linking could take place between the dryer and the calender thereby providing the transparentising resin for a longer period of time to penetrate the paper 14.
  • the resin can be applied to a low grammage part of the paper created by the well known processes of mould or dandy roll water marking. This results in a very significant enhancement of the watermark as the contrast between the lighter areas in the watermark are shown as colour changes. In the case of mould made watermarks, this also has the advantage of the creating a local area low in opacifying pigment such as titanium dioxide which further increases the transparentising effect of the transparentising resin and therefore the colour effect of the iridescent substance.
  • the transparentising resin can also be applied to a decorative watermark
  • the resin can be applied as an outline or frame 36 around a watermark 37 or a low grammage patch of the paper which has the effect of drawing attention to the watermark.
  • the transparentising resin can be applied to a streak in the paper.
  • a fibre locator to direct different types of fibres to certain places on the mould thus causing a streaking effect in the resulting paper.
  • These different types of fibres may create a streak of more porous paper structure. Where such a streak is created it has the effect of enabling the transparentising resin to absorb into the area of streak better than the surrounding paper and as such can therefore be used to enhance the transparentising effect.
  • a luminescent dye may be added to the transparentising resin and iridescent substance. This has a very important commercial effect as an ultra-violet lamp can give a transmitted luminescence which is normally only available in reflected light.
  • the luminescent transparentising resin may be applied to a decorative watermark.
  • the result of the feature which, when viewed in UV transmitted light, reveals the shadow of the watermark. This is an unexpected effect and because of its striking appearance it is a useful security feature.
  • the effect of the transparentising resin can be enhanced by the known process of intaglio printing which has the effect of embossing the paper.
  • the combination of heat and pressure used in the intaglio embossing process improves the distribution of resin through the paper, except in the case of non-thermo plastic resins such as the radiation cured type.
  • titanium dioxide or another opacifying pigment, is added to high quality security papers to reduce see-through and strike-through of print and to minimise undesirable paper luminescence.
  • the level of titanium dioxide in the present invention is preferably kept to a minimum.
  • the iridescent feature is applied in register with the watermark in both the machine and cross-direction.
  • Unregistered features have the inherrent advantage of technical simplicity, but by the same token are markedly easier to counterfeit in quantity then registered features.
  • Such a process requires the use of optical detectors that identify the watermark position and feeds this information back to the electronic unit that controls the drive of the printing screen in the case of screen printing.
  • web tension control may be the mechanism by which register is achieved.
  • Papers suitable for banknotes and security documentation are made from a variety of fibres such as linen, abaca, wood pulp, cotton and blends thereof. Wood pulp is commonly used in non-banknote security documents, whilst cotton is the preferred fibre for banknotes. These cotton fibres are often from waste materials, such as off-cuts from the textile industry. The processed fibres have a ribbon-like profile which have a high surface-to-surface contact area. However, to produce appropriate cotton fibres for manufacturing banknote paper and the like, the fibres must be refined from their original tubular configuration by the mechanical process of defribrillation.
  • Such paper is generally made from fibre that has a Schopper Riegler value of 45° - 70 .
  • the fibres are natural fibres and can vary from batch to batch, resulting in a variation of the porosity of the paper. Further porosity variations result from different specification demanded by different customers.
  • the sizing resins referred to are surface sizing resins, as opposed to internal sizing resins.
  • traditional sizing resins such as polyvinylalcohol (PVOH) or gelatine are used as functionally these are generally the most successful.
  • PVOH polyvinylalcohol
  • gelatine gelatine
  • the concentration of the size may also be varied during processing.
  • UV curable, non-curable and cross-linkable resins may be known ultra violet (UV) curable, non-curable and cross-linkable resins.
  • the process of screen printing the transparentising resin onto the paper sheet 14 and the time taken for the resin to be absorbed into the paper depends, amongst other things, on the viscosity of the resin.
  • the viscosity of the resin As paper making machines run at different speeds and the properties of the base paper fibres can vary, it is necessary to control the viscosity of the resin in order to control the transparency of the paper. It is therefore recommended that two resins are taken from different ends of the viscosity spectrum, which can be blended to form a resin at an appropriate viscosity for the machine speed, the level of transparency to be achieved, the rate of absorbtion, and so on.
  • FC-430 Fluorad (trade mark) supplied by 3M which is a fluoroaliphatic polymericester.
  • the degree of penetration of resin can also be controlled depending on the quantity of resin applied, the dwell time, the absorption rate and so on.
  • the preferred resins are 100% resins with no solvent incorporated. They have a Refraction Index in the region of 1.5 and a viscosity in the region of 400-1500 centipoise at 23°C. They should preferably be non-yellowing and transparent. As curable resins harden, it is also necessary that they should have appropriate physical strength requirements. For example, they must not be brittle.
  • Photomer 4061 (trade mark) which is a tripropylene glycol diacrylate
  • Photomer 5018 (trade mark) may be used, which is a polyester tetrofunctional aerylate, both supplied by Harcros Chemical (UK) Limited.
  • These resins are generally at the opposite ends of the viscosity spectrum and can be combined to provide a suitable transparentising resin at an appropriate viscosity.
  • Non-curable resins The physical criteria for a suitable non-curable resin are basically the same as those of the UV curable resins.
  • Suitable materials include polybutene material such as Hyvis 7 (trade mark) which is a polyisobutylene supplied by BP Chemicals or Hyvis 5 (trade mark) which is also a polyisobutylene supplied by BP Chemicals.
  • Hyvis 5 has a higher viscosity than Hyvis 7.
  • non-curable resins generally stay in the liquid state and have no physical strength requirements. However, for the purposes of the present invention if a non-UV-curable resin is used it must be a resin which is capable of becoming a solid matrix to hold the iridescent surface in place.
  • Cross-linkable resins It is suggested that resins such as epoxy and alkyd resins may also be used. However, it is important that a number of these take some considerable time to cure. If the change has not taken place by the time the paper is reeled, the whole reel of paper is glued together or resin transfer to adjacent sheets can occur.
  • IRIODIN (trade mark) which are mica platelets coated with titanium dioxide (TiO ) supplied by Merck AG.
  • TiO titanium dioxide
  • the substance comes in a range of colours depending on the thickness of the TiO coating with a particle size ranging from about 5 to 100 microns.
  • the quantity of platelets added to the resin is 40% by weight of the resin.

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Abstract

L'invention se rapporte à des améliorations relatives aux caractéristiques de sécurité du papier, et en particulier à un procédé de fabrication de papier permettant de rendre transparentes certains zones du papier pour lui conférer des caractéristiques de sécurité améliorées. L'invention se rapporte ainsi à un procédé de fabrication de papier consistant à déposer des fibres (12) sur une surface de support (13) pour former une feuille absorbante et poreuse (14), à appliquer, sur au moins une partie de cette dernière, une composition comprenant une résine (40) rendant transparent, qui contient elle-même une substance iridescente (41), et à imprégner ultérieurement la feuille poreuse d'une résine d'encollage.
PCT/GB1994/002030 1993-09-30 1994-09-19 Ameliorations relatives aux caracteristiques de securite du papier WO1995009276A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU76223/94A AU7622394A (en) 1993-09-30 1994-09-19 Improvement in security features for paper

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9320206A GB2283026B (en) 1993-09-30 1993-09-30 Improvement in security features for paper
GB9320206.7 1993-09-30

Publications (1)

Publication Number Publication Date
WO1995009276A1 true WO1995009276A1 (fr) 1995-04-06

Family

ID=10742794

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1994/002030 WO1995009276A1 (fr) 1993-09-30 1994-09-19 Ameliorations relatives aux caracteristiques de securite du papier

Country Status (5)

Country Link
CN (1) CN1106091A (fr)
AU (1) AU7622394A (fr)
GB (1) GB2283026B (fr)
WO (1) WO1995009276A1 (fr)
ZA (1) ZA946600B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1398175A3 (fr) * 2002-09-13 2008-11-19 Agfa-Gevaert Support d'information comportant une filigrane
FR2922561A1 (fr) * 2007-10-22 2009-04-24 Arjowiggins Licensing Soc Par Feuille de securite comprenant une marque de securite iridescente
US20120205062A1 (en) * 2006-02-09 2012-08-16 Arjowiggins Security Sheet material comprising at least one watermark having a colored shade
RU2530419C2 (ru) * 2009-05-13 2014-10-10 Обертур Текноложи Способ изготовления защитного элемента для защищенного документа

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9612496D0 (en) * 1996-06-14 1996-08-14 De La Rue Thomas & Co Ltd Security device
DE19829004A1 (de) * 1998-06-30 2000-01-05 Giesecke & Devrient Gmbh Sicherheitspapier
US6368455B1 (en) * 2001-05-31 2002-04-09 Appleton Papers Inc. Method for making security paper
IT1320079B1 (it) * 2000-10-25 2003-11-18 Cartiere Di Cordenons S P A Materiali cartacei filigranati stampabili con elevata qualita' distampa.
FR2849657B1 (fr) * 2003-01-03 2005-07-15 Arjo Wiggins Feuille possedant un aspect iridescent, et son procede de fabrication
GB0325729D0 (en) 2003-11-04 2003-12-10 Rue De Int Ltd Security device
GB0714141D0 (en) 2007-07-19 2007-08-29 Rue De Int Ltd security device
CN111270559A (zh) * 2019-09-09 2020-06-12 华南理工大学 一种纳米纤维素/纳米氧化锌多功能保护液及其制备方法与对纸质文献保护的方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR505373A (fr) * 1914-01-22 1920-07-29 Charles Andre Coppier Procédé pour la préparation de papiers fiduciaires de tous genres
US3985927A (en) * 1975-02-24 1976-10-12 Nekoosa Edwards Paper Company, Inc. Compositions and method for producing a chemical watermark on finished paper products
GB1489084A (en) * 1975-10-28 1977-10-19 Tullis Russell Co Ltd Simulated watermarking
DE3024394A1 (de) * 1980-06-28 1982-01-21 Letron GmbH, 8750 Aschaffenburg Verfahren zur herstellung eines kunststoff-furnieres in einer papiermaschine
EP0234885A2 (fr) * 1986-02-24 1987-09-02 Moore Business Forms, Inc. Document portant des indices imprimés caractéristiques juxtaposés avec des filigranes caractéristiques et correspondants obtenus par impression et procédé pour obtenir ce document

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2524026B1 (fr) * 1982-03-25 1985-09-13 Arjomari Prioux Matieres cellulosiques transparentisees et leurs applications, leur procede de fabrication et les compositions de transparentisation correspondantes
GB8905471D0 (en) * 1989-03-10 1989-04-19 De La Rue Co Plc Sheet with security device
EP0490825B1 (fr) * 1990-12-12 1995-03-15 - Sihl - Zürcher Papierfabrik An Der Sihl Papier de sécurité pour billets de banque ou similaires et procédé de fabrication
FR2670812B1 (fr) * 1990-12-21 1996-06-21 Arjomari Europ Feuille imprimable pour fabriquer des documents de securite comportant un moyen contre la contrefacon ou d'authentification.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR505373A (fr) * 1914-01-22 1920-07-29 Charles Andre Coppier Procédé pour la préparation de papiers fiduciaires de tous genres
US3985927A (en) * 1975-02-24 1976-10-12 Nekoosa Edwards Paper Company, Inc. Compositions and method for producing a chemical watermark on finished paper products
GB1489084A (en) * 1975-10-28 1977-10-19 Tullis Russell Co Ltd Simulated watermarking
DE3024394A1 (de) * 1980-06-28 1982-01-21 Letron GmbH, 8750 Aschaffenburg Verfahren zur herstellung eines kunststoff-furnieres in einer papiermaschine
EP0234885A2 (fr) * 1986-02-24 1987-09-02 Moore Business Forms, Inc. Document portant des indices imprimés caractéristiques juxtaposés avec des filigranes caractéristiques et correspondants obtenus par impression et procédé pour obtenir ce document

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1398175A3 (fr) * 2002-09-13 2008-11-19 Agfa-Gevaert Support d'information comportant une filigrane
US20120205062A1 (en) * 2006-02-09 2012-08-16 Arjowiggins Security Sheet material comprising at least one watermark having a colored shade
US8852396B2 (en) * 2006-02-09 2014-10-07 Arjowiggins Security Sheet material comprising at least one watermark having a colored shade
FR2922561A1 (fr) * 2007-10-22 2009-04-24 Arjowiggins Licensing Soc Par Feuille de securite comprenant une marque de securite iridescente
WO2009056730A2 (fr) * 2007-10-22 2009-05-07 Arjowiggins Licensing Feuille de securite comprenant une marque de securite iridescente
WO2009056730A3 (fr) * 2007-10-22 2009-07-09 Arjowiggins Licensing Sas Feuille de securite comprenant une marque de securite iridescente
US10259247B2 (en) 2007-10-22 2019-04-16 Arjowiggins Security Security sheet including an iridescent security mark
EP2203313B1 (fr) 2007-10-22 2020-12-02 Oberthur Fiduciaire SAS Feuille de securite comprenant une marque de securite iridescente
RU2530419C2 (ru) * 2009-05-13 2014-10-10 Обертур Текноложи Способ изготовления защитного элемента для защищенного документа

Also Published As

Publication number Publication date
ZA946600B (en) 1995-04-03
GB2283026A (en) 1995-04-26
GB9320206D0 (en) 1993-11-17
CN1106091A (zh) 1995-08-02
AU7622394A (en) 1995-04-18
GB2283026B (en) 1997-01-08

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