EP3403844B1 - Procédé de fabrication d'un élément de sécurité pourvu d'une zone en relief métallisée - Google Patents

Procédé de fabrication d'un élément de sécurité pourvu d'une zone en relief métallisée Download PDF

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Publication number
EP3403844B1
EP3403844B1 EP18000456.6A EP18000456A EP3403844B1 EP 3403844 B1 EP3403844 B1 EP 3403844B1 EP 18000456 A EP18000456 A EP 18000456A EP 3403844 B1 EP3403844 B1 EP 3403844B1
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EP
European Patent Office
Prior art keywords
region
relief
demetallization
washing
metallized
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.)
Active
Application number
EP18000456.6A
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German (de)
English (en)
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EP3403844A1 (fr
Inventor
Björn Teufel
Winfried HOFFMÜLLER
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.)
Giesecke and Devrient Currency Technology GmbH
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Giesecke and Devrient Currency Technology GmbH
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Publication of EP3403844A1 publication Critical patent/EP3403844A1/fr
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Classifications

    • 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
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/23—Identity cards
    • 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
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/24—Passports
    • 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
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • 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
    • B42D25/328—Diffraction gratings; Holograms
    • 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
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/373—Metallic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/425—Marking by deformation, e.g. embossing
    • 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
    • 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
    • B42D25/445—Marking by removal of material using chemical means, e.g. etching

Definitions

  • the invention relates to a method for producing a security element with a metallized relief area.
  • Data carriers such as value or identity documents, but also other objects of value such as branded items, are often provided with security elements for protection that allow the authenticity of the data carrier to be checked and / or serve as protection against unauthorized reproduction.
  • the security elements can, for example, be embedded in a bank note in the form of metallized foils or arranged over an opaque area, a window area or a continuous opening in the data carrier.
  • the metallized foils also contain demetallized subareas which are used to represent a desired motif and / or to provide additional authentication of the data carrier. These metal-free areas are usually produced with the aid of a washing process, as described, for example, in the publication WO 99/13157 is described.
  • a translucent carrier film is printed with a desired pattern using a printing ink with a high pigment content. Due to the high pigment content, the printing ink forms a porous, raised color application after drying.
  • a thin metallic cover layer is then formed on the printed carrier film, which only partially covers the color body in the area of the application of color due to its large surface area and the porous structure. The application of paint and the overlying metallic cover layer can then be removed by washing out with a suitable solvent, so that recesses are produced in the cover layer in the originally printed areas of the carrier film.
  • WO 2009/083146 A2 is selectively printed either only on the elevations or only in the depressions of a relief structure.
  • the metallization of an embossed structure which comprises two areas at different levels, is removed in one of the areas with a laser WO 2009/100869 A2 .
  • WO 2017/028950 A1 a multi-layer structure is removed by means of washing ink, whereby a relief structure is not printed with washing ink.
  • EP 1 972 462 A2 discloses a wash dye having a reactive ingredient.
  • the invention is based on the object of avoiding the disadvantages of the prior art and in particular of specifying a method for producing a security element with which filigree demetallization areas can be produced in a metallized relief area in a simple manner.
  • the invention is based on the surprising finding that the thin washing color layer applied in step W) has different effects on the subsequent demetallization in step A) in the flat area and in the relief area. While the thin layer of washing color in the narrow flat area leads to the removal of the metallization, there is no demetallization in the relief area. An explanation of this phenomenon based on current understanding is presented below.
  • relief and flat structures can be produced with great accuracy and the metallization or demetallization produced by the present method matched to these structures, metallized structures can be produced and non-metallized partial areas are aligned with one another and with the underlying relief structure with high precision.
  • the distance between the edge of the relief structure and the demetallization can be kept smaller than 10 ⁇ m, in particular smaller than 3 ⁇ m or even 2 ⁇ m.
  • Such a register accuracy, in general and in particular for fine demetallization structures cannot be achieved with conventional methods. Since the conventional, area-wise printing of washing ink takes place in a separate printing step, a positional tolerance of around 300 ⁇ m was created.
  • the relief area is also often referred to as a height-structured area, since it has elevations and depressions as structural elements. It goes without saying that the relief area of the carrier, in addition to the two sub-areas mentioned, can also have further sub-areas which are separated from one another by narrow flat areas. The following statements on the flat area and the partial areas of the relief area preferably apply to all flat areas and relief partial areas present on the carrier.
  • step W) the washing color layer of small layer thickness in the relief area is selectively applied only to the elevations of the relief structure, preferably to the upper 20%, in particular to the upper 10% of the elevations.
  • the washing color layer with a small layer thickness in the relief area is selectively introduced only into the depressions of the relief structure, preferably into the lower 20%, in particular into the lower 10% of the depressions.
  • the properties of the wash color can be specifically chosen so that selective application or introduction is supported.
  • a high viscosity of the washing color promotes selective application only to the elevations, while a low viscosity promotes selective application only into the depressions of the relief structure.
  • a narrow flat area with a width of less than 1000 ⁇ m is advantageously formed in step R), preferably a flat area with a width between 10 ⁇ m and 1000 ⁇ m, particularly preferably between 10 ⁇ m to 500 ⁇ m, and very particularly preferably between 10 ⁇ m to 250 ⁇ m.
  • the elevations and depressions of the relief structure advantageously form structural elements with a height of more than 0.5 ⁇ m, preferably more than 1 ⁇ m or more than 2 ⁇ m, in particular about 4 ⁇ m.
  • the height of the structures is - in each case - preferably below 8 ⁇ m, that is to say in particular between 0.5 to 8 ⁇ m, 2 to 8 ⁇ m or 3 to 5 ⁇ m.
  • the lateral extension of the structural elements is preferably smaller than 100 ⁇ m and is, for example, 10 ⁇ m to 30 ⁇ m.
  • a particularly small contact surface of the relief area with a printing form, such as a gravure cylinder, can be obtained by means of pointed elevations.
  • the relief structure therefore advantageously has a non-sinusoidal cross section.
  • the relief structure is advantageously designed with pointed elevations, in particular in the form of prisms or three-, four- or more-sided pyramids.
  • Prismatic structural elements are in particular arranged in such a way that one of their edges forms a roof-like tip.
  • the small layer thickness of the washing color layer is preferably less than 20%, in particular in the range from 1 to 20%, preferably between 1 to 10%, of the height of the relief structure.
  • the relief structure is preferably formed by an embossed structure, since the desired structures can be produced easily and with high accuracy by embossing.
  • the relief structure can in particular be a micromirror arrangement, a blaze grating with a sawtooth-like furrow profile, a Fresnel lens arrangement, or else a diffractive structure such as a hologram, a holographic grating image or a hologram-like diffraction structure.
  • the metallized relief structure advantageously acts as a diffuse or metallic reflector, but it is also within the scope of the invention that the relief structure only serves as a spacer for the printing form during the printing process and does not or hardly affects the visual reflection properties of the security element.
  • Suitable solvents are available for washing inks.
  • water can be used as the solvent.
  • the washing ink layer with a small layer thickness is applied to the relief area and the flat area as toning in a gravure printing step in step W).
  • washing ink with normal layer thickness is applied simultaneously in a demetallization area, that in step M) the demetallization area is also metallized, and that in step A) the washing ink of normal layer thickness together with the overlying metallization in the demetallization area removed and the demetallization area is thereby demetallized.
  • a “normal layer thickness” here refers to a layer thickness of the washing color in which more reliable demetallization is ensured in the large-area demetallization areas.
  • the "small layer thickness” is preferably at least (5 or) 10 times smaller than the normal layer thickness.
  • the conventionally undesirable toning of the washing color can be used in a targeted manner within the scope of the invention and increased to a value at which demetallization is promoted in the flat area, but undesired demetallization does not yet occur in the relief area.
  • the toning of the wash color can be set by at least one of the following parameters (or combinations thereof): the pigmentation of the wash color, the choice of binder, the electrostatics during the printing process (switching on or off the electrostatic printing aid ESA), the setting of the Squeegee (such as the angle of attack), the type and pressure of the impression roller, the circumference of the printing cylinder and / or the atmosphere of the printing cylinder can be influenced.
  • the demetallization in the flat area does not necessarily have to be complete, since small metal residues are hardly noticeable in the narrow flat areas between the reflective relief partial areas.
  • degrees of demetallization above 70%, preferably above 80% and in particular above 90% have proven useful.
  • the binder of the washing color is advantageously water-soluble and the washing color used advantageously has a particularly high degree of color transfer.
  • the gravure cylinder is expediently provided with a certain roughness in its flat areas, in particular in order to optimize the running of the doctor blade.
  • the washing ink layer with a small layer thickness in step W) is applied as an ultra-thin ink layer in a flexographic printing step on the relief area and the flat area. It is also advantageously provided that in the flexographic printing step washing ink with normal layer thickness is applied simultaneously in a demetallization area, that in step M) the demetallization area is also metallized, and that in step A) the washing ink of normal layer thickness together with the overlying layer in the demetallization area Metallization is removed and the demetallization area is thereby demetallized.
  • the security element on the carrier can also contain a conventional, large-area metallized partial area in which there are no relief structures.
  • the washing color is advantageously applied in a solvent atmosphere.
  • the metallization in step M) is advantageously formed by a single metal layer, preferably with a thickness between 5 nm and 100 nm, or by one or more single metal layers in a multilayer structure.
  • An aluminum, chrome or copper layer for example, can be applied as a single metal layer.
  • the metal layer and possible further layers of the multilayer structure are preferably vapor-deposited (by means of CVD or PVD processes).
  • Multi-layer structures can be produced, for example, in the form of a color-shifting thin-film element with a metallic absorber layer, a dielectric spacer layer and a metallic reflector layer. With the metal layer of the metallization, non-metallic layers can optionally also be removed at the same time.
  • the security element contains a carrier with a metallized relief structure with elevations and depressions and a narrow, demetallized flat area without elevations and depressions that is matched to the relief structure.
  • the flat area separates at least two partial areas of the relief area from one another and has a width below 1000 ⁇ m, preferably a width between 10 ⁇ m and 500 ⁇ m, in particular between 10 ⁇ m and 250 ⁇ m.
  • the relief structure advantageously consists of structural elements with pointed elevations, in particular in the form of prisms or three-, four- or more-sided pyramids.
  • the elevations and depressions of the relief structure advantageously form structural elements with a height of more than 0.5 ⁇ m, preferably more than 1 ⁇ m or more than 2 ⁇ m, in particular about 4 ⁇ m.
  • the height of the structures is - in each case - preferably below 8 ⁇ m, that is to say in particular between 0.5 to 8 ⁇ m, preferably between 2 to 8 ⁇ m or particularly preferably between 3 to 5 ⁇ m.
  • the lateral extent of the structural elements is preferably less than 100 ⁇ m and is, for example, 10 ⁇ m to 30 ⁇ m.
  • the further statements made in the description of the manufacturing process also apply to the security element manufactured using this process.
  • Figure 1 shows a schematic representation of a bank note 10 which is provided with a security element produced according to the invention in the form of a film patch 12.
  • the invention is not limited to the production of the transfer element shown for illustration in banknotes, but can also be used, for example, for security threads, wide security strips or cover films that are arranged over an opaque area, a window area or a continuous opening of any data carrier.
  • the film patch 12 shows a metallized three-dimensional relief motif 14 that bulges out of the xy plane of the security element for the viewer and can be designed, for example, in the form of a portrait, an architectural or technical motif or a natural motif.
  • the relief motif 14 contains not only metallized subareas but also demetallized subareas, which on the one hand have a design function within the image motif, but on the other hand also take on information-carrying functions and can, for example, represent negative writing. If the demetallized subareas are conventionally produced by printing washing ink and a washout step after the metallization, only relatively large subareas with the smallest dimensions of 1 mm or a line width of 100 ⁇ m or more can be introduced.
  • FIG. 2 Show for a more detailed explanation of the special feature according to the invention Figures 2 and 3 a detail section 16 of the relief motif 14, wherein Fig. 2 a supervision and Fig. 3 a cross section along the line III-III of Fig. 2 represents.
  • the detail section could represent a button, an epaulette or (elsewhere in the motif) an eye, for example.
  • the detail section 16 of the relief motif 14 contains a metallized relief area 20 with partial areas 22, 24, a large demetallized area 26 and a narrow, demetallized strip 28 which separates the two metallized partial areas 22, 24 of the relief area 20 from one another.
  • the relief structure of the subregions 22, 24 has a multiplicity of inclined, small micromirrors 30 which, due to their metallization, reflect incident light efficiently in a predetermined direction. Due to their alignment, the micromirrors 30 create the impression of a predetermined three-dimensional relief motif 14 for the viewer, for example the portrait of the Fig. 1 .
  • the demetallized strip 28 separating the two partial areas 22, 24 from one another is very filigree and in the exemplary embodiment has a width of only 50 ⁇ m.
  • the strip 28 is designed as a flat area 38 without elevations and depressions.
  • the demetallized flat area 38 is arranged in perfect register with the metallized relief areas 22, 24.
  • the toning film which is technically unavoidable in gravure printing, can be specifically applied and used to produce filigree, precisely matched demetallized structures 28 within metallized relief structures 22, 24 in a simple and reliable manner.
  • FIG Fig. 4 based on the production of the security element 12 of Fig. 1 described in more detail, with (a) to (d) each showing the detail section 16 of the Figures 2 and 3 show at intermediate steps of the manufacturing process.
  • an embossing lacquer layer 42 is applied to a carrier film 40 and the desired relief structure with the arrangement of micromirrors 30 is embossed into the embossing lacquer layer 42.
  • the relief structure is provided in a relief area with two partial areas 32, 34, the shape and size of which exactly match the shape and size of the areas 22, 24 to be metallized ( Fig. 2 ) is equivalent to.
  • the micromirrors 30 thereby form elevations and depressions in the embossing lacquer layer 42, which in the exemplary embodiment have a structure width of approximately 10 ⁇ m and, depending on the angle of inclination of the micromirrors 30, a structure height of up to approximately 8 ⁇ m.
  • the two partial areas 32, 34 are separated from one another by a narrow flat area 38 in which there are no micromirrors or other elevations or depressions. Outside of the partial areas 32, 34, a large-area demetallization area 36 is provided, in which there should likewise be no metallization in the finished security element 12.
  • the large demetallization area 36 has a smallest dimension of more than 1 mm and can therefore be demetallized in a conventional manner by printing washing ink and a subsequent washing step, this is not possible for the narrow flat area 38, since washing ink does not have such a small line thickness still with the required accuracy relative to the height-structured subregions 32, 34 can be applied.
  • washing ink is only printed in the gravure printing process on the demetallization areas 36 and other large-area demetallization areas of the carrier 40, 42 and the normally undesired toning is used in a targeted manner.
  • the inventors have surprisingly found that the inevitable toning film in the nominally unprinted surface areas 32, 34, 38 in the flat areas 38 and in the height-structured areas 32, 34 has different effects on the subsequent demetallization: while the thin toning film of the washing color in the narrow If flat areas 38 lead to extensive or even complete demetallization, there is no demetallization in the height-structured areas 32, 34 despite the toning.
  • This thin toning film 48 now forms an essentially continuous thin washing color layer in the flat areas 38.
  • the elevations and depressions of the micromirrors 30 act as small spacers from the ink-carrying gravure cylinder, so that the latter only comes into contact with the tips of the micromirrors 30 comes and only transfers to this wash color 46.
  • a non-contiguous toning film with a significantly lower surface density is created in the height-structured areas 32, 34, as in FIG Fig. 4 (b) illustrated schematically.
  • the surface density of the transferred toning film 46 can be influenced in a targeted manner on the one hand by the shape of the elevations, but on the other hand also by the properties of the washing ink and the process conditions during the printing process.
  • the contact surface of the height-structured areas with the gravure cylinder can be kept very small by means of pointed elevations.
  • the toning of the washing ink can be influenced by the pigmentation of the washing ink, the choice of binder or by the electrostatics during the printing process.
  • the carrier 40, 42 provided with washing ink 44, 46, 48 is then provided with a metal layer 50 over its entire surface in the usual manner, which covers both the demetallization areas 36 and the flat areas 38 and the height-structured micromirror areas 32, 34, as shown in FIG Fig. 4 (c) shown.
  • the metallized carrier is finally subjected to a washing step with a solvent, for example water, in which the washing ink 44 with the metallization 50 is completely removed in the demetallization areas 36 and largely or completely removed in the flat areas 38.
  • a solvent for example water
  • the metallization is retained in the height-structured areas 32, 34 and forms the desired metallized areas 22, 24, since the surface density and the cohesion of the washing ink layer 46 there do not allow for demetallization sufficient.
  • the desired filigree demetallization of the flat area 38 with precise register is also produced.
  • the toning can be increased in a targeted manner to the extent that the demetallization in the flat area 38 is promoted without, however, producing an undesired demetallization in the height-structured areas 32, 34.
  • the demetallization in the flat area 38 is preferably complete, but this is not absolutely necessary for many applications, since small metal residues in the narrow flat areas 38 between the reflective areas 22, 24 are hardly noticeable. The separating effect of the strips already occurs when the metallization of the flat areas is largely removed, for example 70% or more.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Printing Methods (AREA)

Claims (13)

  1. Procédé de fabrication d'un élément de sécurité ayant une zone métallique en relief (20) et une zone plate (28) démétallisée étroite en repérage avec elle, dans lequel
    R) un support (40) est pourvu de telle façon d'une structure en relief ayant des protubérances et des renfoncements qu'une zone en relief (30) et une zone plate (38) étroite, en repérage avec elle, sans protubérances ni renfoncements, sont constituées, cependant que la zone plate (28) sépare entre elles au moins deux zones partielles (32,34) de la zone en relief (30),
    W) pour le support (40), dans la zone en relief (30) et dans la zone plate (38), une couche d'encre lavable (46, 48) de faible épaisseur de couche est mise à disposition et appliquée sur le support (40),
    M) le support pourvu d'encre lavable est métallisé au moins dans la zone en relief (30) et dans la zone plate (38), et
    A) le support métallisé est soumis à une étape de lavage avec un solvant, lors duquel, dans la zone plate (38), l'encre lavable (48) est enlevée conjointement avec la métallisation (50) se trouvant par-dessus et la zone plate est ainsi démétallisée, alors que la métallisation (50) demeure sur le support (40) dans la zone en relief (30) et constitue la zone en relief (20) métallisée.
  2. Procédé selon la revendication 1, caractérisé en ce que, à l'étape W), la couche d'encre lavable (48) de faible épaisseur n'est appliquée dans la zone en relief (30) sélectivement que sur les protubérances de la structure en relief, de préférence sur les 20 % supérieurs, en particulier sur les 10 % supérieurs des protubérances.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que, à l'étape R), une zone plate (38) étroite d'une largeur inférieure à 1000 µm est constituée, de préférence une zone plate (38) d'une largeur comprise entre 10 µm et 1000 µm.
  4. Procédé selon au moins une des revendications de 1 à 3, caractérisé en ce que les protubérances et renfoncements de la structure en relief constituent des éléments structurels d'une hauteur supérieure à 0,5 µm, de préférence supérieure à 1 µm
  5. Procédé selon au moins une des revendications de 1 à 4, caractérisé en ce que la structure en relief est façonnée avec des protubérances pointues, en particulier sous forme de prismes ou de pyramides à trois, quatre ou plusieurs côtés.
  6. Procédé selon au moins une des revendications de 1 à 5, caractérisé en ce que la structure en relief est une structure gaufrée.
  7. Procédé selon au moins une des revendications de 1 à 6, caractérisé en ce que la structure en relief est un agencement de micro-miroirs, un réseau blazé ayant un profil à sillons en dents de scie, un agencement de lentilles Fresnel, ou une structure diffractive telle qu'un hologramme, une image holographique à réseau ou une structure de diffraction s'apparentant à un hologramme.
  8. Procédé selon au moins une des revendications de 1 à 7, caractérisé en ce que la couche d'encre lavable (48) de faible épaisseur de couche est appliquée à l'étape W) sous forme de teinte, lors d'une étape d'impression en creux, sur la zone en relief (30) et la zone plate (38).
  9. Procédé selon la revendication 8, caractérisé en ce que, à l'étape de l'impression en creux, en même temps de l'encre lavable (44) est appliquée en une épaisseur normale de couche dans une zone de démétallisation, que, à l'étape M), aussi la zone de démétallisation (36) est métallisée, et que, à l'étape A), dans la zone de démétallisation (36), l'encre lavable (44) d'épaisseur normale de couche est enlevée conjointement avec la métallisation (50) se trouvant par-dessus et la zone de démétallisation (36) est ainsi démétallisée.
  10. Procédé selon au moins une des revendications de 1 à 7, caractérisé en ce que la couche d'encre lavable (48) de faible épaisseur de couche est appliquée à l'étape W) sous forme de couche d'encre ultra-fine lors d'une étape de flexographie sur la zone en relief (30) et la zone plate (38).
  11. Procédé selon la revendication 10, caractérisé en ce que, lors de l'étape de flexographie, en même temps de l'encre lavable (44) est appliquée en une épaisseur normale de couche dans une zone de démétallisation (36), que, à l'étape M), aussi la zone de démétallisation (36) est métallisée, et que, à l'étape A), dans la zone de démétallisation (36), l'encre lavable (44) d'épaisseur normale de couche est enlevée conjointement avec la métallisation (50) se trouvant par-dessus et la zone de démétallisation (36) est ainsi démétallisée.
  12. Procédé selon au moins une des revendications de 1 à 11, caractérisé en ce que l'encre lavable est appliquée dans une atmosphère de solvant.
  13. Procédé selon au moins une des revendications de 1 à 12, caractérisé en ce que la métallisation (50) est constituée par une couche de métal unique, de préférence d'une épaisseur comprise entre 5 nm et 100 nm, ou par une ou plusieurs couches de métal dans une disposition multicouche qui peut en particulier aussi comprendre des couches non métalliques.
EP18000456.6A 2017-05-18 2018-05-14 Procédé de fabrication d'un élément de sécurité pourvu d'une zone en relief métallisée Active EP3403844B1 (fr)

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DE102019006978A1 (de) * 2019-04-26 2020-10-29 Giesecke+Devrient Currency Technology Gmbh Verfahren zum Herstellen eines Sicherheitselements und Sicherheitselement

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DE59204591D1 (de) * 1991-10-14 1996-01-18 Landis & Gyr Tech Innovat Sicherheitselement.
DE19739193B4 (de) * 1997-09-08 2006-08-03 Giesecke & Devrient Gmbh Verfahren zur Herstellung von Sicherheitsfolien für Wertpapiere
DE102005034671A1 (de) * 2005-07-25 2007-02-01 Giesecke & Devrient Gmbh Sicherheitselement und Verfahren zu seiner Herstellung
DE102006037431A1 (de) * 2006-08-09 2008-04-17 Ovd Kinegram Ag Verfahren zur Herstellung eines Mehrschichtkörpers sowie Mehrschichtkörper
DE102007055112A1 (de) * 2007-01-05 2008-07-10 Giesecke & Devrient Gmbh Verfahren zur Herstellung von Sicherheitsfolien
DE102007062089A1 (de) * 2007-12-21 2009-07-02 Giesecke & Devrient Gmbh Verfahren zum Erzeugen einer Mikrostruktur
DE102008008685A1 (de) * 2008-02-12 2009-08-13 Giesecke & Devrient Gmbh Sicherheitselement und Verfahren zu seiner Herstellung
DE102015106800B4 (de) * 2015-04-30 2021-12-30 Leonhard Kurz Stiftung & Co. Kg Verfahren zum Herstellen eines Mehrschichtkörpers
DE102015010744A1 (de) * 2015-08-17 2017-02-23 Giesecke & Devrient Gmbh Sicherheitselement, Verfahren zum Herstellen desselben und mit dem Sicherheitselement ausgestatteter Datenträger

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