WO2011117472A1 - Papier de sécurité et procédé pour la fabrication d'un papier de sécurité - Google Patents

Papier de sécurité et procédé pour la fabrication d'un papier de sécurité Download PDF

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Publication number
WO2011117472A1
WO2011117472A1 PCT/FI2011/050251 FI2011050251W WO2011117472A1 WO 2011117472 A1 WO2011117472 A1 WO 2011117472A1 FI 2011050251 W FI2011050251 W FI 2011050251W WO 2011117472 A1 WO2011117472 A1 WO 2011117472A1
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WO
WIPO (PCT)
Prior art keywords
paper
base paper
safety
structural
coating material
Prior art date
Application number
PCT/FI2011/050251
Other languages
English (en)
Inventor
Pasi Virtanen
Teuvo LEPPÄNEN
Petteri Lannes
Original Assignee
Upm-Kymmene Corporation
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 Upm-Kymmene Corporation filed Critical Upm-Kymmene Corporation
Priority to EP11758881.4A priority Critical patent/EP2550398A4/fr
Priority to CN2011800161239A priority patent/CN103038420A/zh
Publication of WO2011117472A1 publication Critical patent/WO2011117472A1/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
    • 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
    • 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
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/346—Perforations
    • 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
    • B42D25/435—Marking by removal of material using electromagnetic radiation, e.g. laser
    • 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
    • B42D25/44—Marking by removal of material using mechanical means, e.g. engraving
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/72—Coated paper characterised by the paper substrate
    • 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/02—Patterned paper
    • B42D2033/24—
    • B42D2033/28—

Definitions

  • the invention relates to safety paper.
  • the invention also relates to a method for manufacturing safety paper.
  • Safety papers have been applied particularly for uses, in which the authenticity of a document formed on the paper has to be easily recognized.
  • such uses include, for example, various banknotes and other valuable papers, such as various share certificates, gift vouchers, certificates, pass- ports, identity papers, and tickets.
  • safety paper is also used in the packages of many products which have evolved into valuable brands, as well as in the products themselves or, for example, in documents associated with them, such as instruction manuals, guarantee certificates, etc., to prevent or at least hamper the manufacture and marketing of pirate copies exploiting the brand of these products.
  • a drawback in the safety papers of prior art lies in their manufacturing costs which are higher than for normal paper, and the relative ease in bypassing the protection, particularly in solutions based on conventional methods of protection (watermarking). As a result, they are often considered to be too expensive for uses in which a lot of paper is consumed, such as on pages of books or magazines, whose direct copying or counterfeiting should be prevented. Furthermore, particularly in some more demanding uses, many such methods have been considered to give insufficient protection in relation to the trouble and additional costs caused by them.
  • the innovative idea of the invention is based on providing a base paper used as raw material for finished paper, with an authentication formed by a structural deviation in the base paper.
  • This structural deviation forming the authentication of the safety paper may consist of one or more perforations, holes, thinner/thicker spots/areas, denser/sparser spots/areas formed in the base paper, or colour markings made on one or both surfaces of the base paper.
  • This structural deviation is made before the coating of the paper; in other words, after providing the deviation, the paper is coated with a suitable layer of coating material.
  • the structural deviation that forms the authentication to facilitate the authentication is always below the coating layer in the finished paper.
  • the coating layer is always provided on at least that side of the base paper where the structural deviation is.
  • the base paper is usually coated on its both sides, but even in this case, in some embodiments it may be coated on only one side.
  • the layer of the coating material extends substantially over the whole surface area of the base paper, onto which it has been applied.
  • the thickness of the coating layer is different from those areas where there are no structural deviations.
  • the thickness of the finished paper is primarily constant in all areas of the paper (in other words, deviations only occur within the range of normal thickness tolerances).
  • the coating material layer fills in the thickness deviation at this spot in the base paper or the underlying layer so that the overall thickness of the paper is, nevertheless, the same as in those areas where there is no such structural deviation.
  • the structural deviation is, for example, a layer of a colouring agent or another bulge on the base paper
  • the coating material layer is, at this spot, thinner so that the total paper thick- ness will again remain the same as in the areas around the structural deviation.
  • the colouring agent layer is normally very thin (normally having a thickness of about 5 to 15 ⁇ ), which, in practice, causes hardly any alterations in the thickness of the coating material layer.
  • the colouring agent layer always makes a change in the thickness of the coating material layer, at least in theory, it also constitutes a structural deviation according to the invention, making the coating material layer at this spot slightly thinner than in other areas, since the aim is to keep the total paper thickness constant by means of coating techniques.
  • a structural deviation refers to a deviation made in the base paper either by removing material from it or by adding the same or another material/substance (such as a colouring agent), or by both removing material from the base paper and adding the same or another material onto it.
  • the coating material layer in turn, preferably consists of a coating material that contains a pigment and a binder. The content of pigment is typically 2 to 20 times the content of the binder.
  • the pigment may be, for example, calcium carbonate, kaolin, talc, titanium dioxide, or a mixture of these, or another corresponding pigment known in the field and suitable for the use.
  • the binder may be starch, protein, latex, carboxymethyl cellulose, or a derivative of these, or a mixture of these, or another corresponding binder known in the field.
  • the coating material may contain additives suitable for the use, for example curing agents, lubricants, anti-foam agents, preservatives, acidity regulators, and viscosity regulators.
  • inexpensive standard pigments known in the field can be used in the coating of the base paper for the safety paper according to the invention.
  • coating it is also possible to use any coating mixture suitable for the use, as well as a so-called dispersion coating material.
  • coating refers to both a conventional coating method and a pigmenting application as well as other coating method applications based on these.
  • the paper itself may be any paper product.
  • paper is also considered to include, for example, all paperboard, sack kraft and packing paper products.
  • the safety paper according to the invention has the advantage that such an authentication is difficult to forge, because it was provided in the paper during its manufacture, before the coating of the paper; in other words, the forging of the paper requires the purchase of or access to a corresponding manufacturing process as the paper manufacturer has. Furthermore, the counterfeit- ing is hampered by the fact that the equipment used for producing the structural deviations used as authentication in the safety paper according to the invention is special equipment (for example, a laser producing light that emits a wavelength suitable for the processing of the base paper), which is relatively difficult to purchase as such, requires special skills, and is expensive.
  • the method has the advantage that the producing of such an authentication in the paper does not cause high additional costs as such for the paper manufacturer or slow down the production, because the paper does not need to be reprocessed in a separate finishing process or the like to provide the authentication, but the authentication can be provided during the normal production and, in many cases, even by operating at the normal running speed of the paper machine used in the manufacture of corresponding normal paper. Moreover, the providing of the authentication does not require the addition of special and expensive materials in the paper, so that the material costs of such paper do not deviate notably from the material costs of corresponding ordinary paper.
  • An advantage of the total paper thickness remaining constant is that the paper can be processed without any problems by the same processing apparatuses of the paper machine which are used for processing corresponding paper grades without the safety characteristic according to the invention. Thanks to this, such safety paper can also be printed by any conventional techniques, because the paper does not have such mechanical or chemical properties which could hamper printing. For example, bulges or lower spots, which are often provided in safety papers of prior art, may seriously hinder the offset printing process, because such a spot deviating from the overall thickness of the paper may adhere to rubber rollers. Similar risks may be involved if special chemicals are added, which are commonly used, for example, in copy protected safety papers.
  • Fig. 1 shows a principle view of a safety paper according to the invention, seen from above;
  • Fig. 2 shows a principle view of the cross-section A-A of the safety paper of Fig. 1 ;
  • Fig. 3 shows a principle view of another safety paper according to the invention, seen from above;
  • Fig. 4 a principle view of the cross-section B-B of the safety of Fig. 3;
  • Fig. 5 is a photograph of a safety paper comprising structural deviations of the kind shown in the preceding figures;
  • Fig. 6 shows a principle view of an A4 size sheet of a third safety paper according to the invention, seen from above,
  • Fig. 7 shows a principle view of a cross-section of a structural deviation at spot C in Fig. 6
  • Fig. 8 shows a principle view of a ticket having a structural deviation of the kind shown in Figs. 6 and 7 as an authentication
  • Fig. 9 shows a principle view of a fourth safety paper according to the invention, seen from above.
  • Fig. 10 shows a principle view of the cross-section D-D of the safety paper of Fig. 9.
  • Figures 1 and 2 show principle views of an embodiment of a safety paper according to the invention.
  • the paper has been magnified to a great extent (about 200...400*) in relation to its natural size in the direction of a plane parallel to the surface of the paper.
  • the cross-sectional view of Fig. 2, showing the cross-section A-A of Fig. 1 is further magnified to a great extent (about 500...1000*) in the direction of thickness of the paper, because the figure is intended to illustrate the structure of the paper in the direction of its thickness.
  • the safety paper according to Figs. 1 and 2 is paper coated on its both sides and consisting, as shown in Fig. 2, of base paper 1 and a first coating layer 2a on its upper surface and a second coating layer 2b on its lower surface.
  • the base paper between the coating layers 2a and 2b comprises structural deviations, in this case circular perforations 3, provided at regular intervals.
  • the perforations 3 have a diameter of about 0.2 to 0.4 mm, wherein they are relatively easily visible to the naked eye when the paper is placed against light and looked at from the side opposite to the light source.
  • Perforations 3 may be provided in the whole area of the paper, or they may further form, for example, sets of perforations at regular intervals.
  • the perforations 3 may also be arranged, for example, in a desired pattern. As shown in Fig. 2, the perforations 3 are filled with the coating material, and the overall thickness of the paper is the same at the perforations as elsewhere.
  • Figures 3 and 4 show another embodiment of the safety paper according to the invention.
  • Figure 4 shows the cross-section B-B of Fig. 3.
  • the paper has been formed of base paper 5 coated on both sides with coating layers 4a and 4b.
  • the magnification used in Fig. 3 is approximately the same as in the case of Fig. 1 , and the magnification used in the thickness direction of the paper in Fig. 4, respectively, corresponds to the magnification in the thickness direction in Fig. 2.
  • the structural deviation forming the authentication comprises grooves 6a-6c formed in the base paper 5.
  • the grooves 6a-6c extend in the cross direction of the paper.
  • the grooves 6a-6c may further extend either through the whole base paper or to only some extent from one surface of the base paper in the thickness direction of the base paper.
  • the groove 6a extends through the base paper 5
  • the groove 6c extends about half way in the thickness of the base paper 5
  • the groove 6b is shorter in depth than half of the thickness of the base paper.
  • the widths of the grooves 6a-6c are different as well.
  • Such grooves can thus be used to provide the safety paper with e.g. a bar code, if desired, by means of which it can be identified automatically by means of a suitable bar code reader.
  • the grooves 6a-6c have been made in the base paper 5 during its manufacture, in the direction transverse to the running direction of the paper web. Because they have been made in the running paper web, they are slightly wider at the top, due to the running of the paper web.
  • Such grooves could also extend in the running direction of the paper web, or diagonally to the running direction.
  • the grooves could also have a curved or even angular shape; in other words, they could be used to form a marking, such as a text or pattern, visible through the coating of the paper.
  • the groove 6c is more oblique in the running direc- tion than the other grooves. By increasing the obliqueness, it is possible to make the groove look slightly different when seen from different directions. In this way, by using different oblique grooves and also oblique perforations, the paper web can be provided with patterns resembling a hologram.
  • the effect can be intensified by the colouring of the grooves and perforations and by the shaping of the edges.
  • the coating layers 4a and 4b have approximately the same thickness in those areas where there are no grooves.
  • the grooves 6a-6c are filled up with the coating material.
  • the grooves 6a-6c are visible as stripes deviating slightly or to some extent in their colour shade or brightness from the other areas of the paper. The deeper the groove, the more different it looks when seen from above the paper.
  • the colour shade and the brightness are also influenced by the type of the coating material used for coating the base paper 1.
  • the grooves 6a-6c have a width of about 0.2 to 0.5 mm.
  • Figure 5 shows how such structural deviations in the base paper of the paper are distinguished from the base paper in relation to the natural variation in colour and brightness of the paper.
  • the structural devia- tions are structural deviations made by laser, similar to the application of Figs. 1 to 4, used to write bar and number codes on the paper as seen in the figure.
  • Figures 6 and 7 show a third embodiment of the safety paper according to the invention. It shows a size A4 sheet of safety paper, also consisting of base paper 7 and coating layers 8a and 8b, as shown in Fig. 7.
  • the authentication is formed by a cutting line 9 in the cross direction of the paper.
  • the cutting line 9 is a structural deviation formed in the base paper, along which the safety paper is most likely to tear when it is pulled evenly in its lon- gitudinal direction.
  • the cutting line 9 is formed of small perforations 10 next to each other in the base paper 7, which are visible in the magnified view of the cross-section of spot C in the cutting line shown in Fig. 7.
  • the adjacent perforations 10 of the cutting line 9 are so small in diameter (for example, smaller than 0.03 mm) that they are not visible to the naked eye. Furthermore, as the base paper 7 is coated on both sides, the cutting line 9 cannot be detected visually.
  • the material selected for the coating layers 8a and 8b is a coating material that covers the pattern of the surface of the base paper relatively well and fills in the perforations 10 but does not notably increase the tensile strength of the paper at the perforations 10 of the cutting line 9.
  • Such a coating material may be, for example, quite a normal coating material mixture which normally has a lower tensile strength than the fibre network of the base paper.
  • the authentication of security paper of Figs. 6 and 7 is performed by a tensile test.
  • a suitable tensile testing device which is, for example, universal or especially designed for this purpose, to subject the paper to a tensile stress that is as uniform as possible over its whole width.
  • the magnitude of the tensile stress is increased until the paper is torn, very probably at least partly along the cutting line 9.
  • the original user and/or supplier of the paper has a reference picture showing said cutting line 9.
  • the cutting line of the paper torn during the authentication test is compared with the reference picture of the cutting line 9 of said paper. If the paper was torn in a way resembling the cutting line 9 according to the reference picture, the paper can be considered to be authentic.
  • the shape of the cutting line formed in the base paper can be curved or angular in different ways, or a combination of these.
  • Cutting lines may be provided in different directions and at different intervals. Their detection can be verified by various techniques which either require a special device or can be implemented in a simple way without auxiliary devices.
  • the aim is to make the cutting line such that it does not impair the tensile strength of the paper in a way that would hamper the use of the paper but in such a way that when subjected to uniform tension, the paper will normally tear along the cutting line 9.
  • Figure 8 shows a ticket to an amusement park, comprising a cutting line 11 as shown in Figs. 6 and 7.
  • the cutting line 11 may be marked to be visible, or it may be invisible or hidden.
  • the cutting line can also be utilized at the stage of checking the ticket; in other words, it may, in some cases, replace a separate perfora- tion in the ticket, to facilitate the tearing of the ticket when it is checked at the entrance.
  • a safety paper of the type shown in Figs. 6 to 8 can be provided with an identification code (for example, a bar code) by means of structural deviations shown, for example, in Figs. 3 and 4.
  • an identification code for example, a bar code
  • the original manufacturer of the paper can, by means of the bar code, retrieve a reference picture for the cutting line corresponding to the paper without knowing, or finding out in other ways, the lot of paper which the original paper comes from.
  • This makes it very difficult to counterfeit the paper, because the data on the shape of the cutting line is only accessible to the owner/manufacturer of the original paper.
  • the shape of the cut- ting line may have been varied within the same lot of paper.
  • Figures 9 and 10 show a fourth embodiment of the safety paper according to the invention.
  • Figure 10 shows a magnified view, similar to those of Figs. 2 and 4, of the cross-section D-D of Fig. 9.
  • this safety paper is formed of base paper 12 coated with coating layers 13a and 13b.
  • one surface of the base paper 12 is provided with markings 14 (in this case, the text "security paper") of ink or another colouring agent, which are left under the coating 13a in the finished safety paper.
  • markings 14 in this case, the text "security paper”
  • the thickness of the coating 13a is suitably thin so that the colouring agent of the markings 14 is relatively clearly visible through the coating layer 13a.
  • the coating material layer is slightly (by the thickness of the colouring agent) thinner at the markings.
  • the coating layer 13b of the lower surface is formed clearly thicker than the coating layer 13a of the upper surface.
  • the markings 14 made on the upper surface of the base paper 12 are not as clearly visible when the paper is seen from the direction of the lower surface than when the paper is seen from the direction of its upper surface.
  • the paper may be coated on only one side, if markings are provided on one side of the paper only.
  • markings may also be provided on both sides of the paper, and these markings may be at the same locations or in totally or partly different locations on the paper.
  • Such structural deviations made with a colouring agent on the base paper may also be, for example, various patterns or, among other things, bar codes instead of text.
  • the authentication of the safety paper may also be formed of a colour marking and a combination of structural deviations presented in the embodiments above.
  • recesses having the shape of the markings may be provided, in which recesses the colouring agent is added.
  • the paper may also comprise perforations or grooves extending through the base paper, as shown in Figs. 1 to 5. These may also be provided with a suitable colouring agent to pick them out and, on the other hand, to make it more difficult to counterfeit the corresponding structural deviation.
  • the overall thickness of the paper always remains constant.
  • the aim has been to make the structural deviations used in the safety paper such that they can be included in the paper in connection with its manufacture, without a separate manufacturing step.
  • they can also be made in the further processing of the paper, or such structural deviations can be made in connection with the paper manufacture, in which the surface treatment to be made in a separate process has been taken into account.
  • the paper for the safety paper according to the invention is usually made primarily in the same way as normal paper, by a conventional paper machine, in which a fibrous web formed of chemical pulp in web form is dried, calendered and coated.
  • the structural deviations are made in the base paper, that is, the dried fibrous web, before its coating.
  • the safety paper does not necessarily need to be coated on both sides, but for example in a case in which the structural deviation is formed by recesses or grooves which do not extend through the paper, the coating can only be applied on that side of the paper where the recesses or grooves have been formed.
  • the coating should be applied in such a way that the overall thickness of the paper at these structural deviations will be substantially the same both at the structural deviations and in the other areas.
  • the base paper is always coated on at least one side in such a way that the coating layer covers substantially the whole surface on at least this side.
  • the coating material layer is applied onto the base paper after the formation of the structural deviations.
  • the thickness of the coating material layer is adjusted (for example, by a doctor blade of the coating device or by a press roll in film coating) so that the overall thickness of the finished safety paper is always the same both at the structural deviations and at those areas where there are no structural deviations. If the structural deviations are perforations or recesses, they are primarily filled up with the coating material in such a way that no empty spaces are left in the perforations or recesses.
  • the base paper 1 to 10 can be formed in the base paper, for example, by means of a laser in such a way that e.g. a suitable laser device is installed on the production line for such paper, after the drying section of the paper machine and before the coating steps.
  • a suitable laser device is installed on the production line for such paper, after the drying section of the paper machine and before the coating steps.
  • the perforations shown in Figs. 1 and 2 can be formed in the base paper by the laser device which generates a laser beam to drill perforations in the base paper during the running of the paper machine.
  • the suitable device may be mounted, for example, on a beam traversing across the paper web in such a way that the beam comprises a carriage movable to and fro across the paper web in its cross direction.
  • This carriage may further comprise sec- ond guides extending in the running direction of the paper web, on which guides the device generating the laser beam is mounted to be movable to a suitable distance (for example 0.5 to 2 m) in the running direction of the web.
  • the laser beam may also be connected to a carriage movable in the cross direction of the paper web, to be swivelled with respect to an axis transverse to the running direction of the paper web, wherein the point of intersection of the beam and the paper web in the running direction of the paper web can be adjusted by turning the beam.
  • the devices used for moving/swivelling the laser beam can be formed by methods known as such, driven by electricity, hydraulics, and/or pneumatics.
  • the laser beam itself can also be generated by applying laser technology known as such (for example, by means of carbon dioxide, solid-state or Nd:YAG laser).
  • the laser beam When making perforations, grooves and/or recesses in the running paper web, the laser beam is moved in the running direction of the paper web and/or in a direction transverse to this, whenever necessary.
  • the laser beam can be moved obliquely to the running direction of the paper web so that the groove formed in the base paper is transverse to the running direction, due to the running of the paper web (the running speed of the paper web is obtained from the paper machine).
  • the size of the perforations, recesses or grooves in turn, can be changed by focusing the laser beam, for example, with a suitable lense.
  • the cutting lines 9 and 1 1 according to Figs.
  • 6 to 8 can be formed by focusing a suitably pulsed laser beam in such a way that when it is directed to the base paper, the beam will burn holes with a diameter of 0.01 to 0.03 mm at regular intervals as the base paper and/or the beam move at a constant speed with respect to each other.
  • the cutting line can be made to the desired shape.
  • the perforations and grooves can also be made by other meth- ods.
  • Possible working methods could include, for example, water jet cutting, sand blasting, or blowing high pressure compressed air.
  • Various mechanical methods can also be used, such as drying or calendering rolls for making perforations, grooves or bulges, or patterns formed of these.
  • a structural deviation 14 formed with a colouring agent on the base paper 12, as shown in Figs. 9 and 10 can be produced most conveniently by an ink-jet printer.
  • other methods could also be used for the marking, such as, for example, the laser printing method or the matrix printing method.
  • the colouring agent does not necessarily need to be a colouring agent visible under natural light, but it may be alternatively, for example, a colouring agent visible under UV light, or an optical brightener that is applied onto desired marking points of the base paper before the coating of the base paper.
  • the safety paper according to the invention can be implemented in a way different from the above-presented example embodiments.
  • the safety paper can be provided with an authentication formed of structural deviations used in connection with these embodiments, for example by combining these structural deviations in various ways.
  • the cutting lines can be formed by using, for example, a thin groove extending almost through the base paper, instead of or in addition to the small perforations extending through the base paper.
  • the embodiment according to Figs. 9 and 10 could be used, in this context, for forming a bar code or another authentica- tion marking, such as a pattern or text, needed for selecting a reference picture for the cutting line.
  • the safety paper according to the invention may contain other, auxil-sammlungy authentications to hamper its counterfeiting and illegal copying.
  • Such an auxiliary authentication could be a coating to prevent the copying of the paper, or a coating which produces in the copy a background colour, or the like, that impairs its quality.
  • the structural deviation may be, for example, a spot in the base paper where the paper fibres are distributed more sparsely or densely.
  • a spot with sparsely distributed fibres could be made, in principle, for example by removing fibres from the base paper by means of compressed air or sand blasting.
  • a spot with densely distributed fibres in the base paper could be made, for example, by controlling the application of chemical pulp on the wire in the head box of the paper machine.
  • the invention should not be limited merely to these example embodiments presented above, but various alternative embodiments can be formed further within the scope of the appended claims.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • General Health & Medical Sciences (AREA)
  • Optics & Photonics (AREA)
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Abstract

La présente invention se rapporte à un papier de sécurité comprenant une authentification pour authentifier le papier. Dans le papier de sécurité selon l'invention, le papier de base comprend un écart structurel comprenant au moins un ou plus de ce qui suit : une ou plusieurs perforation(s) ; des trous ; des points ou zones plus épais ou moins épais ; des points ou zones plus nombreux ou moins nombreux, ou des couches d'agent de coloration appliquées sur le papier de base. En outre, l'écart structurel est recouvert d'une couche de matériau de revêtement. La couche de matériau de revêtement recouvre au moins l'un des côtés du papier de base sensiblement dans sa totalité de telle sorte que l'épaisseur globale du papier soit principalement constante sur toute la surface du papier. Cependant, la couche de matériau de revêtement a une épaisseur différente au niveau des écarts structurels par rapport aux autres régions du papier. La présente invention se rapporte également à un procédé pour la fabrication du papier de sécurité selon l'invention.
PCT/FI2011/050251 2010-03-25 2011-03-25 Papier de sécurité et procédé pour la fabrication d'un papier de sécurité WO2011117472A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP11758881.4A EP2550398A4 (fr) 2010-03-25 2011-03-25 Papier de sécurité et procédé pour la fabrication d'un papier de sécurité
CN2011800161239A CN103038420A (zh) 2010-03-25 2011-03-25 安全纸和用于制造安全纸的方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20105305 2010-03-25
FI20105305A FI126219B (fi) 2010-03-25 2010-03-25 Turvapaperi ja menetelmä turvapaperin valmistamiseksi

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WO2011117472A1 true WO2011117472A1 (fr) 2011-09-29

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PCT/FI2011/050251 WO2011117472A1 (fr) 2010-03-25 2011-03-25 Papier de sécurité et procédé pour la fabrication d'un papier de sécurité

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EP (1) EP2550398A4 (fr)
CN (1) CN103038420A (fr)
FI (1) FI126219B (fr)
WO (1) WO2011117472A1 (fr)

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WO2009127325A1 (fr) * 2008-04-16 2009-10-22 Giesecke & Devrient Gmbh Procédé de fabrication d’un document de sécurité ou de valeur

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Also Published As

Publication number Publication date
EP2550398A4 (fr) 2017-01-25
FI20105305A (fi) 2011-09-26
FI20105305A0 (fi) 2010-03-25
EP2550398A1 (fr) 2013-01-30
CN103038420A (zh) 2013-04-10
FI126219B (fi) 2016-08-31

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