EP2947202A1 - Papier de sécurité doté de filigranes - Google Patents

Papier de sécurité doté de filigranes Download PDF

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Publication number
EP2947202A1
EP2947202A1 EP15168013.9A EP15168013A EP2947202A1 EP 2947202 A1 EP2947202 A1 EP 2947202A1 EP 15168013 A EP15168013 A EP 15168013A EP 2947202 A1 EP2947202 A1 EP 2947202A1
Authority
EP
European Patent Office
Prior art keywords
watermark
paper
screen
range
dewatering
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
EP15168013.9A
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German (de)
English (en)
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EP2947202B1 (fr
Inventor
Susanne Kammerer
Rolf Giger
Christoph Kocher
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.)
Landqart AG
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Landqart AG
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Publication date
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Priority to SI201530665T priority Critical patent/SI2947202T1/sl
Publication of EP2947202A1 publication Critical patent/EP2947202A1/fr
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Publication of EP2947202B1 publication Critical patent/EP2947202B1/fr
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    • 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 present invention relates to a dewatering screen, to a method of manufacturing the same, and to a security feature for security papers made with such a dewatering screen which is e.g. intended for the production of security and value documents, and further such security documents.
  • the watermark is designed as a multi-tone watermark, preferably in the form of a raster image.
  • Security papers such as those used for banknotes, passports, identification documents, identity cards, birth certificates, securities, documents, government documents, etc., usually have e.g. Security elements in the form of watermarks that prove the authenticity of the paper.
  • Watermarks occur during the production of the security paper in the wet part of the paper machine by addition of the wet pulp (pulp) on a moving dewatering screen, which has different embossing depths.
  • the addition of paper fibers during sheet formation is influenced by the flow conditions in such a way that more paper mass accumulates in this area during deep stamping (depression in the wire relative to the middle wire height). Thus thicker and thereby darker appearing passages occur in the finished paper.
  • embossing increase in the sieve relative to the mean sieve height, less paper mass can accumulate there, resulting in thinner and, in the transparent, lighter areas in the paper. It can also create multitone watermarks with smooth gradual transitions between dark and light spots.
  • the area of the paper surrounding the watermark with a substantially constant paper thickness (where the screen is at the middle screen height) is referred to as a velin area.
  • a watermark based on embossing or electrotype is known, which is listed as a multitone watermark, which has transmitted in light and darker areas, which are arranged like a raster image, such that the lighter areas are more or less numerous and thus a large area of the subject.
  • the brighter areas show lower optical density and consequently lower paper strength than the surrounding paper, and are differently distributed depending on the positioning in the watermark.
  • the darker areas in the raster image preferably correspond to the optical density and the paper strength of the surrounding paper.
  • a metal part, an electrotype serve, which has recesses in different sizes and is applied to the dewatering screen.
  • This implementation becomes a multi-tone watermark imitated in the form of a grid and appears particularly bright in transmitted light. Such a feature is very concise and therefore easy to perceive.
  • WO-A-2011081561 An alternative manufacturing process is in WO-A-2011081561 proposed.
  • a mask with micro-openings is applied to the dewatering screen.
  • the diameter and distribution of the micro-openings on the mask are sometimes chosen so that accumulates paper mass in the micro-openings and thus creates a watermark with dark halftone dots in this area in the finished paper.
  • the diameter and distribution of the micro-openings are defined in such a way that they serve for the pure dewatering of the paper pulp, ie without fibers attaching to the micro-openings. This should be a bright watermark with multi-tone effect in the form of a screening similar to the EP-A-1 122 360
  • the low paper strengths in the lighter areas are reduced.
  • EP-A-0 549 384 A bright watermark is described which is produced by a metal plate with drainage properties deposited on the dewatering screen.
  • the drainage is carried out by regularly distributed elements in the metal plate, whose dimensions are so large that even paper mass can attach to these.
  • a kind of screening in the form of equally distributed elements without multi-tone effect is generated in the watermark.
  • a further disadvantage is that such bright watermarks in the form of a raster image with raster structure can be emulated more easily in contrast to true multitone watermarks, which, as described above, are formed by embossing the dewatering screen and contain both areas which are lighter than the surrounding velin area, such as areas which are darker than the surrounding velin area.
  • spurious watermark are, for example, in DE-A-198 32 878 described. To imitate watermarks, a composition is allowed to penetrate or print on the surface of the paper so that the paper mass chemically changes there, and thus the transparency of the paper and thus brighter areas appear in the manner of a watermark.
  • the dewatering screens with watermarks described above are expensive to manufacture because they involve additional operations such as accurately positioning and applying metal or plastic parts to the dewatering screen.
  • influences such as temperature, an acidic environment but also mechanical forces acting on the sieve can cause such metal parts to change or even come off. In this case, the paper machine must be stopped and the screen repaired or replaced, which is associated with maintenance costs and production losses.
  • a security paper with a watermark should be specified, the watermark compared to conventional designs has increased visibility, security against counterfeiting and ideally also an increased recognition value.
  • the essence of the invention consists in performing a watermark as a raster image of a plurality of introduced in the dewatering screen compared to the surrounding paper area dark appearing raster elements.
  • the invention accordingly according to a first aspect relates to a dewatering screen for the production of Paper with at least one watermark, wherein the dewatering screen comprises a wire mesh which is arranged outside the area of the watermark at a first height (average screen height) and in which means for generating the watermark are arranged in the area of the watermark.
  • the screen is characterized in that the means are formed as discrete areas in the form of a plurality of lines and / or points, which represent a raster image of the watermark.
  • the discrete areas are provided as depressions in the wire mesh relative to the first height.
  • the discrete regions for forming the entire or at least a portion of the subject of the watermark are all formed with a same depth.
  • the discrete regions may also have different depths, so that a kind of multi-tone effect can also be generated in the later paper by the different depths, such that continuous transitions are generated via a screening.
  • a depression is to be understood as meaning regions which, viewed from the side of the paper sheet to be formed of the screen, are in the form of depressions, i. in the form of concave or equally-recessed areas throughout, e.g. wherein the screen plane is offset away from the paper web in a confined area relative to the first height of the screen.
  • the pits may be in the form of grooves (formation of dark lines in the paper), e.g. circular depressions (formation of round dark spots in the paper), etc.
  • Such a depression in the lower region may particularly preferably have a widening of the stitches. If a recess forming the watermark at the end of the dewatering screen is indicated in the sequence with a depth in mm, this is the distance from the deepest depression of the watermark to an imaginary plane at the first level.
  • a recess is also a spatially limited through hole in the wire, in which the wires of the screen are severed in this area.
  • a depression in the sense of this application are also corresponding areas in which the sieve meshes are not severed as compared to the surrounding area but considerably widened (without depression), so that a local permeability which results in a severance results.
  • the dewatering screen thus proposed accordingly permits the production of watermarks in which the pixels forming the screening (lines, dots) appear darker than the area surrounding the watermark, because more pulp material is deposited there.
  • the screening constituting picture elements to some extent as reinforced areas formed in paper and the disadvantages can be avoided.
  • the dewatering screen is characterized in that the discrete areas are provided as wells with increased drainage, in which the mesh width of the wire mesh of the dewatering screen is widened relative to the surrounding area.
  • This additional widening can be carried out selectively by subsequent manipulation after embossing, or else the embossing die itself can be configured such that a widening results.
  • the recesses are preferably offset from the first height at the lowest point by a depth in the range of 0.3 to 1.5 millimeters, preferably offset in the range of 0.5 to 0.8 millimeters.
  • the depression is an effective aperture, then it is below the depth to understand the length of the formed there collar of mesh.
  • the depressions may also be provided as passage openings in the wire mesh of the dewatering screen, in which the wires of the wire mesh are interrupted in these areas.
  • the discrete areas that make up the raster image in its entirety may be formed as lines and / or as points.
  • the raster elements are formed as lines, they preferably have at the respective widest point a width in the range of 0.5-5 millimeters, preferably in the range of 0.2-2.0 millimeters.
  • the lines can also have a variable width along their length.
  • the grid elements are formed as dots, they may preferably be in the form of circles, ovals, polygons, preferably in the form of squares, diamonds, triangles, rectangles, pentagons, hexagons.
  • the dots may be represented as symbols, preferably in the form of letters, numbers, symbols such as e.g. Currency symbols etc. be formed.
  • they in the largest dimension measured in the direction parallel to the screen plane, they have a length in the range of at least 0.2-5 millimeters, preferably in the range of 0.3-2 millimeters, and in the smallest dimension measured in the direction parallel to the screen plane a length in the range of 0.1-2 mm, preferably in the range of 0.2-1 mm.
  • the raster elements can preferably have a variable size and / or shape as a function of the desired image and partly merge into each other in edge regions.
  • the dewatering screen is according to a further preferred embodiment characterized in that, with a wire diameter in the range of 0.1-0.3 mm, preferably in the range of 0.15-0.25 mm, in a first direction (chain, preferably in a round screen in the circumferential direction) per centimeter 20-40, preferably 25-35 wires, and in a second direction perpendicular to the first direction (weft, preferably axially extending in a circular screen) 15-35 wires, preferably 20-30 wires.
  • the drainage screen is a round screen.
  • the dewatering screen can be arranged according to a further preferred embodiment, a further support screen.
  • This support screen is preferably connected at least pointwise with the dewatering screen (for example by spot welding).
  • the backing screen is normally somewhat coarser than the dewatering screen, i. larger mesh size and thicker wires than the dewatering wire, and preferably, with a wire diameter in the range of 0.1-0.3 mm, preferably in the range of 0.15-0.25 mm, in a first direction (chain) per centimeter 25-40, preferably 25-35 wires on, and in a second, perpendicular to the first direction (shot) 10-30 wires, preferably 15-25 wires.
  • the present invention relates to a method for producing a dewatering screen as described above.
  • the method is preferably characterized in that the discrete regions are produced by an embossing which preferably widens the mesh size, preferably by a stamp having the lines and / or points as elevations (for example produced by milling from a blank), and / or Discrete areas are created by drilling, punching, widening by needles, using laser, cutting torch, electric current.
  • the present invention relates to a method for producing a security paper with a watermark, wherein the motif forming the watermark of a plurality of raster elements, preferably in the form of lines and / or points is constructed, and in which these raster elements compared to the outside Watermark arranged portion of the paper have a higher density and thus a dark appearance in transmitted light.
  • a method for producing a security paper with a watermark wherein the motif forming the watermark of a plurality of raster elements, preferably in the form of lines and / or points is constructed, and in which these raster elements compared to the outside Watermark arranged portion of the paper have a higher density and thus a dark appearance in transmitted light.
  • a method uses a dewatering screen as set forth above.
  • the dewatering screen can be immersed in the form of a round screen in the pulp to form the paper.
  • the dewatering screen may also be a wire, in which case the dewatering screen in the form of a wire with the pulp is subjected to the formation of the paper.
  • the paper is in both cases by dewatering on respectively on the screen and subsequent drying, optionally sizing and / or calendering and / or Coating, made.
  • the proposed watermark is particularly suitable for such structures, since the watermark for thin paper layers (30-40 g / m 2 , preferably 33-36 g / m 2 , in particular 35 g / m 2 ) is best suited and has a high contrast.
  • the present invention relates to a paper with a watermark, in which the subject forming the watermark is composed of a multiplicity of raster elements, preferably in the form of lines and / or dots, and in which these raster elements are arranged in comparison to the region located outside the watermark of the paper have a higher density and thus a dark appearance in transmitted light.
  • a watermark is preferably made using a dewatering screen as set forth above, or preferably prepared in a process as set forth above.
  • the watermark is thus constructed from a plurality of lines and / or points, which represent a raster image of the watermark, wherein these lines and / or dots are made darker in the transmitted light than the region of the paper surrounding the watermark.
  • the proportion of dark areas is in the range of 20-90 area%, preferably in the range of 30-80 area%, particularly preferably in the range of 40-60 area% (in each case based on the total area of the subject).
  • the paper is preferably a security or a banknote, wherein preferably the security or the banknote is made up of a plurality of such paper layers, preferably by at least one layer of a paper having such a watermark with another layer, which optionally also has such a watermark has, is connected via an intermediate plastic layer.
  • a security paper for the production of security and value documents on a watermark with multi-tone effect which is composed of a plurality of dark elements, which appear in transmitted light as a raster image.
  • the grayscale image to be generated is resolved in a first step into a black-and-white grid 20, and this grid 20 is embossed in the form of individual deeply embossed raster elements 14 (screen dots, grid lines) in the dewatering screen.
  • the embossing of the watermark 23 thus consists of a grid of numerous individual embossings instead of an embossment with continuous transitions.
  • the technologies of embossing of conventional dewatering screens are known in the art and for example in the Weinblatt für Textilfabrikation "Optimization options for the production of individual watermarked paper"; Issue 11/12, 2002 described.
  • the darker elements are realized by deep embossing (depression in the sieve) 2 of the dewatering sieve 1 (cf. Fig. 1 ), this in such a way that locally more paper mass accumulates in these areas in papermaking and a higher paper thickness and, consequently, a higher optical density results in the finished paper at this point.
  • Fig. 1 the dewatering screen 1 is shown in a sectional view. The horizontal whole line indicates the mean height 6 of the dewatering screen in the area outside the watermark. The area outside the watermark is also indicated by the reference numeral 8. The area of the subject of the watermark is indicated by the reference numeral 7. At one point is illustrated how a depression can be configured as an opening 3.
  • the dewatering screen 1 is in Fig. 1 shown as a layer (thick black line), it comprises the wires (not shown) which form the screen, and typically have a diameter in the range of 0.2 mm.
  • the wires are perpendicular braided over cross out, the chain is usually performed at a round screen in the circumferential direction and the shot parallel to the axis of the round screen.
  • Fig. 1 schematically shown with a dashed line is the surface of the paper formed, as well as the thickness of the paper. 4
  • the embossing depth of the dewatering screen i. the distance between the plane 6 and the lowest point of the respective recess 2, is chosen so that there are no difficulties in the form of holes in the paper or paper tears during papermaking.
  • the embossing depth is usually in the range 0.2-1.5 mm, preferably in the range of 0.3-1 mm, particularly preferably in the range of 0.7 mm.
  • a stamp is typically required which has a depth which is about 20-30% greater in the negative image.
  • the drainage can be increased, i. the stitches can be widened or even broken locally.
  • the stamping of the dewatering screen 1 can therefore also be carried out so that the wires of the dewatering screen break in the depth of the stamping due to the high deformation. This not only creates a stamping but also an opening 3 of the dewatering screen. Surprisingly, the breakage of the wires of the dewatering screen leads to no problems, but to a particularly dark expression of the corresponding grid point and thus to a further improvement of the contrast.
  • a watermark can thus also be realized by introduced in the form of a raster image openings of the dewatering screen.
  • openings of the dewatering screen can be implemented, for example, in the form of bores, punched holes, openings made by means of a laser, cutting torch, electric current or any other suitable technique.
  • the openings may still have a downwardly oriented typically circumferential collar of mesh, but the openings can also be easily formed as holes in the mesh.
  • these openings can be achieved by widening the mesh size of the Enticassungssiebes done instead by a separation of the wires of the dewatering screen.
  • the darker elements 14 in the inventive watermark of the security paper have a higher optical density and thus a higher paper strength than the surrounding vellum paper 8. They can also have different levels of optical density, depending on how to choose the embossing depth of the dewatering screen 1.
  • the locations between the darker elements have substantially the same optical density and thus the same paper strength as the surrounding vellum paper. However, in contrast to the darker spots, they are surprisingly brighter to the viewer than the surrounding vellum paper at the end. Preferably, these brighter areas all have the same optical density and thus the same paper strength as the surrounding vellum paper.
  • the dark and light elements may take on different size, distribution and shape and are not limited to a desired design to obtain a particular motif in the form of a raster image.
  • the dark and light elements may occur in the form of dots of different sizes, shapes and distribution.
  • the dark and light elements may be the same size and / or regularly distributed.
  • the total area of the dark elements dominates the total area of the light elements 15 (cf. FIG. 2 ). Different appearing brightnesses of a certain range can thus be generated either by adjusting the size of the raster elements and / or by adjusting the density of the raster elements accordingly.
  • the grid elements can touch or overlap.
  • the dark and light elements may also appear as lines in different thicknesses and distribution.
  • the lines can also be the same thickness and / or distributed, wherein preferably the dark elements 14 dominate (see. FIG. 3 ).
  • the shapes may be parallel in a single predetermined direction or in be arranged in different directions. Likewise, different forms of dark and light elements can be combined (cf. FIG. 4 ).
  • the size and distribution of the dark elements are chosen so as to produce a macroscopic effect in the finished paper, i. that with the naked eye the watermark is clearly perceived as a raster image.
  • the size and distribution of the darker elements in the watermark can be chosen to give some sort of microscopic effect between the dark elements, which is of the order of magnitude of the screen structure, but different from and thus difficult to imitate. This effect occurs when the extent of the screen dot is on the order of the sieve mesh. This effect can be used as an additional authenticity feature, e.g. in a forensic analysis.
  • the dewatering screen 1 consists of interwoven metal or metal / plastic wires 5 and consequently leaves a screen structure in the finished paper during manufacture.
  • the bright elements in the watermark 23 on the dewatering screen 1 correspond to the areas between the embossings. If one selects the areas between the deep embossings so that they essentially fall within the range of the mesh size of the sieve fabric of the dewatering sieve, then by combination of sieve fabric and deep embossing in the finished paper microscopically small, bright elements 15. Depending on the Siebmaschung these microscopic small, bright elements cause 15 fine lines, stars, crosses or the like (cf. FIG. 5 ).
  • halftone dots can be deliberately omitted, so that the deliberate omission of halftone dots causes recesses in the form of patterns, characters, numbers, etc. as bright spots within the halftone image (cf. FIG. 3 and 4 ; Globe).
  • these bright recesses all have a substantially same optical density as the surrounding vellum 8.
  • the recesses 24 in the raster image have an uninterrupted border 25 which has a substantially higher optical density than the surrounding vellum 8 (cf. FIG. 3 ; Word "grid").
  • the border 25 may also have its own arbitrary screening and be chosen so that a macroscopic and / or microscopic effect occurs in transmitted light.
  • the recesses 24 in the form of Patterns, characters and encodings clearly highlighted.
  • this method one also obtains an attractive effect in the manner of a highlight watermark without the associated disadvantages of the prior art, which requires a complex application by, for example, soldering, welding or sticking metal parts on the dewatering screen and a local weakening of the security paper ,
  • the halftone dots can condense, so that by the deliberate compression of the halftone dots forms 27, for example, as patterns, characters, numbers, etc. arise dark uninterrupted places within the halftone image (see. FIG. 2, 3 . 4 and 5 ; Symbol "Q")
  • halftone dots within the halftone image can be deliberately omitted in order to achieve a coding within the halftone image.
  • halftone dots can be interconnected to also achieve a coding within the raster image.
  • the watermark can be identified by suitable means, e.g. in the infrared transmitted light, registered with suitable camera systems and the hidden coding can be read.
  • the production lot can be coded in this way without substantially changing the appearance of the watermark according to the invention among the various production lots.
  • the security paper with the inventive watermark 23 can be made neutral white or in a shade. Surprisingly, with a nuanced, i. lightly colored paper has an increased contrast effect. The dark spots of the inventive watermark appear particularly dark, probably due to a relatively lower leaching of the coloring pigments and dyes and fillers in the low embossing of the dewatering screen 1.
  • the watermark 23 may represent a single motif or may be combined with other types of watermarks such as true multistage watermarks 30, shadow watermarks, electrotypes, spurious watermarks.
  • the inventive watermark in combination may represent a separate motif or be integrated into a conventional watermark.
  • the inventive watermark integrated into a conventional watermark can also represent a separate motif or be part of the overall motif of the watermark.
  • the watermark 23 may also be used in combination with features such as mottled fibers,
  • Security threads machine-readable features, fluorescent pigments, Upconverterpigmenten, etc. are combined. Further, it may be combined with other features applied or applied by finishing and / or printing such as screen printing, hologram foils, blind embossing, etc.
  • the security paper may in particular be a single- or multi-layered paper, preferably with a high percentage of cotton, but also coated paper or composite materials in which at least one layer is based on paper.
  • Such a paper composite of at least two paper layers and a plastic layer is, for example, in WO-A-2004076198 described.
  • a particularly high contrast can be achieved between screening and the (especially thin) velin area.
  • multi-layered substrates such as those resulting from the subsequent combination of several layers of different substrates and of which at least two layers paper-based each lie in a single layer a erfindungsconcessiges watermark and / or combined with a conventional watermark or with another inventive watermark.
  • the combination can be done in different layers, so that isolated motifs, but also combinations in transmitted light can be seen.
  • the security paper according to the invention can be produced on a long or round screening machine, the production preferably taking place on a round screening machine.
  • FIG. 6b an example of the inventive watermark is shown on a banknote.
  • the starting point is a corresponding digital image template of the subject in the form of a grayscale image with a resolution of min. 300 pixels and 125 shades of gray.
  • This image template is converted to a black-and-white "amplitude-modulated" halftone screen using the Adobe Photoshop® computer program (hereafter referred to as PS).
  • PS Adobe Photoshop® computer program
  • the value "70" in white Font color without contour inserted with a font size of 62 The finished raster image then corresponds to the representation in Fig. 6a ,
  • This raster image is now transferred as a negative image on a first blank blank in the size 100 x 100 mm by means of a CNC milling machine.
  • the white areas are milled with a milling depth of 1 mm into the cavity blank so that the areas subsequently appearing in the watermark black respectively dark are provided as elevations. This results in the matrix form of the embossing stamp.
  • a male mold is milled as a counterpart to the female mold from a second cavity blank in the size 100 x 100 mm by means of a CNC milling machine. Die and patrix form the finished die.
  • a dewatering screen with a screen mesh of 32/24 (warp / weft threads, square centimeters, wire thickness: 0.17 / 0.18 mm) together with a support wire with a sieve mesh of 28/19 (warp / weft threads, square centimeter, wire gauge : 0.21 / 0.23 mm).
  • the effective depth of the embossing in the dewatering screen was about 0.7 mm after this process.
  • the dewatering screen then has numerous individual embossings in the area of the embossing.
  • the embossed drainage and support screen is then mounted on a screen cylinder.
  • the finished round cylinder is installed in a round screening machine for the production of banknote paper.
  • the watermark according to the invention consists of dark elements in the form of parallel lines. These dark elements correspond to the black parallel lines in the digital raster image (comparisons Fig. 6a and 6b ). Due to the deep embossing of the dewatering screen, these dark elements have a higher paper thickness (at least before calendering) and, consequently, a higher optical density than the surrounding vellum paper. The dark elements all have the same optical density.
  • the bright elements in the inventive watermark in Fig. 6b correspond to the white areas in the digital raster image in Fig. 6a , The bright elements have the same paper thickness in the paper and, consequently, the same optical density as the surrounding vellum paper.
  • the recess in the form of The value "70" also has the same optical density as the surrounding vellum paper. Due to the strong light-dark contrast of the screening but the bright elements, as well as the recess in the inventive watermark appear much lighter than in the surrounding vellum paper.
  • Fig. 7a the inventive watermark is shown in combination with a conventional grayscale watermark.
  • Fig. 7a is the inventive watermark the "cloak" of the woman.
  • the combination of a watermark according to the invention and a grayscale watermark, which is shown, is carried out as follows.
  • the starting point is an image template in the form of a grayscale image in which the overall motif is shown.
  • the image template has a resolution of min. 300 pixels and 125 shades of gray.
  • PS the "cloak" of the woman in the image template is marked and isolated from the overall motif.
  • the woman's isolated "cloak” is converted into a halftone grid of black grid rhythms and white background by amplitude modulation.
  • a diamond grid with 15 lines / inch and a screen angle of -45 ° is selected in PS in the coarsening filter.
  • the value "10” in white font color and in font size 30 is inserted into the rastered halftone image.
  • the value "10” also receives a black contour with a contour thickness of 12 Pt.
  • the now finished raster image is merged with the rest of the original image to form an overall motif.
  • This overall motif is now transferred as a negative image to a blank blank in the size 100 x 100 mm by means of a milling machine.
  • a milling depth of 1 mm is selected for the white areas.
  • the non-screened portion of the overall motif, which will later form the conventional watermark, is milled as a three-dimensional relief with the maximum depth of cut of 1 mm in the cavity blank.
  • the effective depth of the embossing in the dewatering screen was about 0.7 mm after this process.
  • the embossed dewatering screen thus has partial areas in the area of the embossing with continuous embossed transitions in the form of a three-dimensional relief (for the conventional Grayscale watermarks) and subareas with a grid of numerous individual embossings (for watermarks according to the invention).
  • the depth of the deepest embossment of the three-dimensional relief for the conventional grayscale watermark corresponds to the depth of the embossings for the watermark according to the invention with a depth of approximately 0.7 mm.
  • the embossed drainage and support screen is then mounted on a screen cylinder.
  • the finished round cylinder is installed in a round screening machine for the production of banknote paper.
  • the watermark is a combination of inventive watermarks and conventional watermarks Fig. 7a shown.
  • the inventive watermark consists of dark elements in the form of evenly distributed diamonds. Due to the deep embossing of the dewatering screen, these dark elements have a higher paper thickness (at least before calendering) and, consequently, a higher optical density than the surrounding vellum paper. The dark elements all have the same optical density.
  • the bright elements have the same paper thickness in the paper and, consequently, the same optical density as the surrounding vellum paper. Due to the light-dark contrast of the screening, however, the bright elements in the watermark according to the invention appear distinctly lighter than the surrounding vellum paper.
  • the recess in the form of the value "10” in the watermark according to the invention has the same optical density as the surrounding vellum paper.
  • the border (contour) of the value "10” on the other hand has the same paper thickness and thus the same optical density as the dark elements of the screening.
  • the value "10" in the watermark according to the invention appears particularly bright in the manner of a highlight watermark in comparison to the surrounding vellum paper due to the strong light-dark contrast of the screening and the additional dark border.
  • the conventional grayscale watermark shows no sharp light-dark contrasts, but soft gradual transitions between the gray levels.
  • the depth of the deepest imprint for the conventional grayscale watermark is equal to the depth of the embossings for the watermark according to the invention and, consequently, the paper thickness in these areas should be the same in the paper, the optical density appears differently in these areas.
  • Reason is the already mentioned strong light-dark contrast of the screening in the inventive watermark in contrast to the soft gradual transitions in the conventional grayscale watermark.
  • the dark elements in the watermark according to the invention appear to have a higher optical density than the dark elements in the grayscale watermark having the same paper thickness.
  • a 90 g / m 2 banknote paper can be made with the embossed in Example 2 round screen and a 35 g / m 2 watermark paper, which as a semi-finished product for producing a printing substrate according to WO2004076198 serves.
  • a 35 g / m 2 watermarked paper with the watermark in Fig. 7a
  • a cotton blend of 90% cotton worsted and 10% linters with 63 ° SR (Schopper-Riegler) and a mean fiber length of 1.1mm is used.
  • the filler used is titanium dioxide (anatase) in an amount such that the finished paper has an ash content of ⁇ 10%.
  • the appearance of the entire watermark is as already described in Example 2 for the 90 g / m 2 watermark paper.
  • the watermark in the 35 g / m 2 watermark paper is higher in contrast than in the 90 g / m 2 watermark paper.
  • the reason is the overall lower paper thickness in the area of the surrounding vellum paper.
  • the light-dark contrast of the screening of the inventive watermark appears particularly strong, so that the bright areas and the recess in the inventive watermark, which have the same paper thickness as the surrounding vellum paper appear particularly bright.
  • Fig. 7a the inventive watermark is shown in combination with a conventional grayscale watermark.
  • Fig. 7b the watermark according to the invention is a wing of the butterfly.
  • the combination of inventive watermarks and conventional gray-scale watermarks produced is performed as follows.
  • the starting point is an image template in the form of a grayscale image in which the overall motif is shown.
  • the image template has a resolution of min. 300 pixels and 125 shades of gray.
  • PS marks a wing of the butterfly in the image template and isolates it from the overall motif.
  • the butterfly's isolated wing is converted into a halftone grid of black grid crosses by amplitude modulation.
  • a 0.65 x 0.65 mm symbol in the form of a cross with white fill and a contour of 12 Pt is inserted into the rastered halftone image.
  • the finished raster image is merged with the rest of the original image to form an overall motif.
  • This overall motif is now transferred as a negative image to a blank blank in the size 100 x 100 mm by means of a milling machine.
  • a milling depth of 1 mm is selected for the white areas.
  • the non-screened portion of the overall motif, which will later form the conventional watermark, is milled as a three-dimensional relief with the maximum depth of cut of 1 mm in the cavity blank.
  • the effective depth of the embossing in the dewatering screen was about 0.7 mm after this process.
  • the embossed dewatering screen thus has partial embossing areas with continuous embossed transitions in the form of a three-dimensional relief (for the conventional greyscale watermark) and subregions with a grid of numerous individual embossings (for watermarks according to the invention).
  • the depth of the deepest embossment of the three-dimensional relief for the conventional grayscale watermark corresponds to the depth of the embossings for the watermark according to the invention with a depth of approximately 0.7 mm.
  • the embossed dewatering screen is clamped together with a support screen on a screen cylinder.
  • the finished round cylinder is installed in a round screening machine for the production of banknote paper.
  • a 90 g / m 2 banknote paper with the watermark in Fig. 7b is a cotton blend of 75% cotton Kämmlingen and 25% Linters with a grind 45 ° SR (Schopper-Riegler) and a mean fiber length of 1mm.
  • the filler used is titanium dioxide (anatase) in such an amount that the finished paper has an ash content of ⁇ 5%.
  • the watermark of combination of inventive watermarks and conventional watermarks corresponds to the in Fig. 7b displayed watermarks.
  • the dark elements are realized by the embossing of the Entskyssungssiebes in the form of grid crosses, which accumulates more pulp than in the surrounding Velin Stud and consequently the paper in this area has a higher paper thickness (at least before calendering) and thus has a higher optical density.
  • the areas between the low embossings in the dewatering screen (which form the bright elements in the watermark according to the invention in the later paper) are chosen such that they fall in the order of magnitude of the screen mesh.
  • Example 4 In contrast to Examples 1 to 3, in which one can recognize the screening with the naked eye in the inventive watermark, it comes in Example 4 by combination of mesh (which leaves its screen structure in the paper) and embossing to microscopic, bright elements in the finished Paper in the form of finely distributed dots.
  • the conventional grayscale watermark in contrast to the watermark according to the invention, exhibits smooth gradual transitions between the gray levels.

Landscapes

  • Paper (AREA)
  • Credit Cards Or The Like (AREA)
  • Printing Methods (AREA)
EP15168013.9A 2014-05-21 2015-05-18 Papier de sécurité doté de filigranes Active EP2947202B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI201530665T SI2947202T1 (sl) 2014-05-21 2015-05-18 Varnostni papir z vodnim znakom

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH00775/14A CH709680A1 (de) 2014-05-21 2014-05-21 Entwässerungssieb für die Herstellung von Papier mit wenigstens einem Wasserzeichen und damit hergestelltes Papier mit einem Wasserzeichen.

Publications (2)

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EP2947202A1 true EP2947202A1 (fr) 2015-11-25
EP2947202B1 EP2947202B1 (fr) 2018-12-19

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EP (1) EP2947202B1 (fr)
CH (1) CH709680A1 (fr)
ES (1) ES2710231T3 (fr)
HK (1) HK1217741A1 (fr)
MA (1) MA39262A (fr)
SI (1) SI2947202T1 (fr)

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Publication number Priority date Publication date Assignee Title
WO2018100150A1 (fr) * 2016-12-02 2018-06-07 Oberthur Fiduciaire Sas Procédé et masque pour la fabrication d'un papier filigrane, procédé de fabrication du masque papier filigrane obtenu et procédé d'authentification du papier filigrane

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EP0549384A1 (fr) 1991-12-09 1993-06-30 Arjo Wiggins S.A. Procédé pour la fabrication d'un papier comportant des zones localisées d'épaisseur et d'opacité réduites et papier ainsi obtenu
EP0458973B1 (fr) 1989-12-14 1995-05-24 Tokushu Paper Mfg. Co., Ltd Procede de production de papier filigrane
GB2306178A (en) * 1994-08-24 1997-04-30 Arjo Wiggins Sa Method for making security-type paper with localized low opacity areas and paper so obtained
DE19832878A1 (de) 1997-08-06 1999-07-01 Herbert Helmstreit Mittel zum Tintenstrahldruck künstlicher Wasserzeichen
EP1122360A1 (fr) 2000-02-01 2001-08-08 Arjo Wiggins S.A. Papier comportant un filigrane à effet multiton et toile pour fabriquer ce papier
WO2004076198A1 (fr) 2003-02-27 2004-09-10 Landqart Stratifie multicouche
DE102005042344A1 (de) 2005-09-06 2007-03-08 Giesecke & Devrient Gmbh Entwässerungssieb und Verfahren zu seiner Herstellung
WO2011081561A1 (fr) 2009-12-28 2011-07-07 Федеральное Государственное Унитарное Предприятие "Гознак" (Фгуп "Гознак") Papier protégé contre la contrefaçon contenant des filigranes et grille pour fabrication
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WO2012013809A1 (fr) * 2010-07-30 2012-02-02 Banque De France Toile poreuse pour la fabrication d'un papier de securite, procedes de fabrication d'une telle toile et papier filigrane cree par une telle toile

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EP0458973B1 (fr) 1989-12-14 1995-05-24 Tokushu Paper Mfg. Co., Ltd Procede de production de papier filigrane
EP0549384A1 (fr) 1991-12-09 1993-06-30 Arjo Wiggins S.A. Procédé pour la fabrication d'un papier comportant des zones localisées d'épaisseur et d'opacité réduites et papier ainsi obtenu
GB2306178A (en) * 1994-08-24 1997-04-30 Arjo Wiggins Sa Method for making security-type paper with localized low opacity areas and paper so obtained
DE19832878A1 (de) 1997-08-06 1999-07-01 Herbert Helmstreit Mittel zum Tintenstrahldruck künstlicher Wasserzeichen
EP1122360A1 (fr) 2000-02-01 2001-08-08 Arjo Wiggins S.A. Papier comportant un filigrane à effet multiton et toile pour fabriquer ce papier
WO2004076198A1 (fr) 2003-02-27 2004-09-10 Landqart Stratifie multicouche
DE102005042344A1 (de) 2005-09-06 2007-03-08 Giesecke & Devrient Gmbh Entwässerungssieb und Verfahren zu seiner Herstellung
WO2011081561A1 (fr) 2009-12-28 2011-07-07 Федеральное Государственное Унитарное Предприятие "Гознак" (Фгуп "Гознак") Papier protégé contre la contrefaçon contenant des filigranes et grille pour fabrication
DE102010017986A1 (de) * 2010-04-21 2011-10-27 Giesecke & Devrient Gmbh Sicherheitspapier für Sicherheitsdokumente sowie Herstellungsverfahren dafür
WO2011137941A1 (fr) * 2010-05-06 2011-11-10 Fedrigoni S.P.A. Procédé de mise en œuvre d'un treillis métallique à filigraner, treillis métallique à filigraner, appareil permettant d'obtenir celui-ci et document anti-contrefaçon
WO2012013809A1 (fr) * 2010-07-30 2012-02-02 Banque De France Toile poreuse pour la fabrication d'un papier de securite, procedes de fabrication d'une telle toile et papier filigrane cree par une telle toile

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018100150A1 (fr) * 2016-12-02 2018-06-07 Oberthur Fiduciaire Sas Procédé et masque pour la fabrication d'un papier filigrane, procédé de fabrication du masque papier filigrane obtenu et procédé d'authentification du papier filigrane
FR3059682A1 (fr) * 2016-12-02 2018-06-08 Oberthur Fiduciaire Sas Procede de fabrication d'un papier filigrane
CN110050098A (zh) * 2016-12-02 2019-07-23 欧贝特信托公司 制造水印纸的方法和掩模、制造获得的水印纸掩模的方法及验证水印纸的方法
KR20190089898A (ko) * 2016-12-02 2019-07-31 오베르튀르 휘뒤셰르 사스 워터마킹된 종이를 제조하는 방법 및 마스크, 획득한 워터마킹된 종이 마스크를 제조하는 방법 및 워터마킹된 종이를 인증하는 방법
CN110050098B (zh) * 2016-12-02 2022-02-11 欧贝特信托公司 水印纸制造方法和掩模、掩模制造方法及水印纸验证方法

Also Published As

Publication number Publication date
EP2947202B1 (fr) 2018-12-19
HK1217741A1 (zh) 2017-01-20
CH709680A1 (de) 2015-11-30
SI2947202T1 (sl) 2019-04-30
ES2710231T3 (es) 2019-04-23
MA39262A (fr) 2015-11-25

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