EP2607550B1 - Base substrate for a film composite bank note - Google Patents

Base substrate for a film composite bank note Download PDF

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Publication number
EP2607550B1
EP2607550B1 EP12008410.8A EP12008410A EP2607550B1 EP 2607550 B1 EP2607550 B1 EP 2607550B1 EP 12008410 A EP12008410 A EP 12008410A EP 2607550 B1 EP2607550 B1 EP 2607550B1
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EP
European Patent Office
Prior art keywords
substrate
base substrate
characterized
regions
hole
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
EP12008410.8A
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German (de)
French (fr)
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EP2607550A8 (en
EP2607550A1 (en
Inventor
Patrick Renner
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 GmbH
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
Priority to DE102011122113A priority Critical patent/DE102011122113A1/en
Application filed by Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
Priority to DE201210024774 priority patent/DE102012024774A1/en
Priority to DE102012024768.0A priority patent/DE102012024768A1/en
Publication of EP2607550A1 publication Critical patent/EP2607550A1/en
Publication of EP2607550A8 publication Critical patent/EP2607550A8/en
Application granted granted Critical
Publication of EP2607550B1 publication Critical patent/EP2607550B1/en
Application status is Active legal-status Critical
Anticipated expiration legal-status Critical

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    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP 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
    • D21H21/00Non-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
    • D21H21/14Non-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
    • D21H21/40Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP 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
    • D21H21/00Non-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
    • D21H21/14Non-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
    • D21H21/40Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
    • D21H21/42Ribbons or strips
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP 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
    • D21H21/00Non-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
    • D21H21/50Non-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 form

Description

  • The invention relates to a base substrate for a composite film banknote, to a value document having such a base substrate, to a method for producing such a base substrate or document of value, and to a dewatering screen for the production of such a base substrate.
  • Data carriers, such as valuables or identity documents, but also other valuables, such as branded goods, are often provided with security elements for the purpose of security, which permit verification of the authenticity of the data carrier and at the same time serve as protection against unauthorized reproduction. Increasingly transparent security features, such as transparent windows in banknotes, are becoming increasingly attractive.
  • From the publication EP 1545 902 B1 For example, a film composite banknote is known which has an inner paper layer and two films applied by means of an adhesive to opposite sides of the paper layer. The paper layer may be interrupted by a hole to form a window in the banknote, in which the two films are directly connected by means of the adhesive.
  • In such designs, the abrupt transition from the relatively thick paper to the hole can lead to undefined and blurred air pockets at the window edge. The laminated films can relax undefined during the curing time and there is a risk that imprint punched edges in the counter-side and generate so-called ghosting.
  • Proceeding from this, the object of the invention is to avoid the disadvantages of the prior art. In particular, it is intended to provide a base substrate for a film composite banknote which allows the production of windows with high window quality, sharp window margins and minimized air inclusions. Ideally, a high process reliability in the production of banknotes should be achieved.
  • This object is solved by the features of the independent claims. Further developments of the invention are the subject of the dependent claims.
  • According to the invention, a base substrate in the form of a rectangular arc having a longitudinal direction and a transverse direction perpendicular thereto is used for producing a composite film banknote, which has at least one strip-shaped hole track extending along the longitudinal direction or the transverse direction of the base substrate. The hole track contains a substrate dilution in the first subregions and a hole extending through the base substrate in the substrate dilution and contains a substrate thickening in the second subregions.
  • In an advantageous embodiment, the base substrate has a substantially constant first substrate thickness S 0 outside the strip-shaped hole tracks. The thickness of the substrate increases in the region of the substrate thickening to a second substrate thickness S thick which is between 1.05 * S 0 and 2.0 * S 0 , preferably between 1.10 * S 0 and 1.60 * S 0 , more preferably between 1.20 * S 0 and 1.40 * S 0 .
  • Advantageously, the substrate thickness in the region of the substrate thickening does not change abruptly but increases in a direction perpendicular to the strip-shaped one Hole trace continuously from the first substrate thickness S 0 to the second substrate thickness S thick and subsequently decreases again continuously to the first substrate thickness S 0 down. The regions of continuous increase and continuous decrease preferably each occupy more than 20%, in particular more than 30%, or even more than 40% of the width of the hole track. For example, the substrate thickness of a 2 cm wide hole track can continuously increase from S 0 to S thick over a 0.9 cm wide area (45% of the width), remain constant in an approximately 0.2 cm wide area (10% of the width), and continuously decrease from S thick to S 0 in a 0.9 cm wide area (45% of the width).
  • Large-area substrate thickening areas are produced in an advantageous design with a dewatering screen with substructures, as described in more detail below. As a result, large-area paper thickenings can be generated reliably, which also have a substantially constant paper thickness in the interior. A large-area paper thickening is understood to mean a paper thickening which occupies an area of more than 25 mm 2 , preferably more than 225 mm 2 and particularly preferably more than 600 mm 2 , on the paper.
  • The fact that the paper thickening has a substantially constant thickness allows the paper thickening to be subjected to a modulation of the paper thickness produced by the abovementioned substructures of the dewatering screen. The modulation depth is in any case significantly smaller than the thickening itself and is preferably below 50%, in particular below 25% of the thickening. In any case, the paper thickness in the area of the paper thickening nowhere decreases to the paper thickness in the outer area of the paper thickening. Since the substructures of the dewatering screen in particular a geometric pattern, for example may form a checkerboard or diamond pattern, a graphic motif depicting numbers, characters, plants, animals, people or objects, or may be randomly distributed within the pit area, there may also be correspondingly shaped modulations in the paper. These modulations can be used as design elements. In further embodiments of the invention, it is provided that the substructures of the dewatering screen be designed such that they do not produce perceptible modulations in the paper without aids to the human eye.
  • According to an advantageous embodiment, the substrate thickness decreases in the region of the substrate dilution in a direction perpendicular to the strip-shaped hole track continuously from the first substrate thickness S 0 to a third substrate thickness S thin at the edge of the through hole and subsequently increases again continuously to the first substrate thickness S 0 out. Again, the areas of continuous decrease and continuous increase preferably each occupy more than 20%, in particular more than 30%, or even more than 40% of the width of the hole track.
  • The at least one strip-shaped hole track preferably has a width between 0.2 cm and 10.0 cm, in particular between 0.5 cm and 3.0 cm. The base substrate may contain only one hole track or several parallel hole tracks.
  • If one considers the amount of substance ΔM thin missing in the substrate dilution of the hole track compared to the outside area outside the hole track and the substance amount ΔM thick exceeding the outside area in the substrate thickening, the relationship advantageously applies to these variables ΔM thick = 0.1 * ΔM thin ... 2.0 * ΔM thin , preferably ΔM thick = 0.5 * ΔM thin ... 1.5 * ΔM thin , and more preferably ΔM thick = 0.8 * Δ M thin ... 1.3 * Δ M thin .
  • In advantageous configurations, the through hole has a sharply delimited edge and in this case is produced, for example, by cutting, in particular laser cutting, or punching. In other, likewise advantageous configurations, the through hole has an edge produced during papermaking with characteristic irregularities and can in this case be produced, for example, by a hole type applied to the dewatering screen.
  • In an advantageous variant of the invention, the strip-shaped hole tracks each consist of the first, thinned partial areas and the second, thickened partial areas, so that each part of a hole track lies either in a substrate dilution (and possibly in a substrate dilution in a hole) or in a substrate thickening.
  • In a further, likewise advantageous variant of the invention, the strip-shaped hole tracks have, in addition to the first and second partial areas, also third partial areas with substantially unchanged substrate thickness in relation to the outer area outside the hole track. In this case, the third partial regions are either arranged completely within the second partial regions or represent interruptions of the second partial regions transversely to the strip-shaped hole track. The formulation according to which the third partial regions represent interruptions of the second partial regions transversely to the strip-shaped hole track comprises both embodiments in which the Interruptions are arranged transversely in the sense of substantially at right angles with respect to the second portions or in which the interruptions are transverse at a non-right angle, in particular diagonally, are arranged with respect to the second portions. Strip-shaped regions which extend parallel to a hole track do not constitute third sub-regions in the sense of the present invention. The strip-shaped hole tracks are therefore also formed in this variant of the invention essentially by the first, thinned subregions and the second, thickened subregions, although in addition Within the second regions, third partial regions with essentially unchanged substrate thickness can be present or the hole trace in the second partial regions can be interrupted by transverse third partial regions.
  • Advantageously, the third portions are formed in the form of webs or non-linear patterns. With particular advantage, they can form a mark of authenticity in the base substrate, in particular a coding, such as a one- or two-dimensional barcode or a Braille script. The third portions may also form a pattern within the hole track, such as a stripe, checkerboard or checker pattern. Furthermore, irregularly shaped third partial regions can be distributed in the second partial regions. It is also conceivable that the third subregions are designed in the form of a motif.
  • The base substrate is preferably formed from paper, in particular cotton paper, or from paper with a proportion of polymer fibers.
  • It should be noted at this point that the thickening according to the invention does not necessarily have to be formed from the same material as the base substrate. In principle, it is conceivable, for example, that the thickening on a base substrate by means of application, in particular imprints of transparent or pigmented paints / adhesives formed becomes. A suitable printing method for producing such a substrate thickening would be, for example, the screen printing method.
  • In addition, the thickening on the base substrate could also be done by spraying transparent or pigmented paints / adhesives by means of a suitable spray nozzle. The two abovementioned possibilities for producing a substrate thickening, which is formed from a different material than that of the base substrate, expediently take place before the arrangement of the further layers, in particular the arrangement of the laminating films for producing the value document.
  • In addition, however, it is also conceivable that the films provided for the arrangement on the base substrate have a thickening which is obtained, for example, by adhering a further film strip. In such a case, therefore, the foils provided for the arrangement on the base substrate have a thickening, so that the value document obtained after the arrangement of these foils on the base substrate ultimately has a hole track which is thickened by the thickened foil regions.
  • The variants described above for producing a thickened hole track by means of transparent or pigmented paints / adhesives / films have the advantage that the thickenings are optically not or only slightly visible. However, the currently claimed base substrate can already be equipped with the substrate thickening according to the invention during the production of the substrate, so that the inventive method is procedurally and therefore economically very advantageous due to the smaller number of process steps compared to the variants mentioned above.
  • The invention also encompasses a value document, in particular a film composite banknote, having a base substrate of the type described above. In a preferred embodiment, the document of value is at least two-layered and contains at least one film layer and at least one base substrate of the type described above.
  • Particularly preferred are currently designs in which the document of value is at least three-layered and contains at least one base substrate of the type described above, which is embedded between two film layers. The through hole of the base substrate and the two embedding foil layers in this case advantageously define a hollow chamber which is filled with a filling material having a security feature. As a security feature, the filler material advantageously has microencapsulated systems or non-spherical effect pigments. In a particularly preferred variant, the security feature has a microencapsulated system which comprises a large number of microcapsules, each of which has a capsule shell and a capsule contents that can be influenced by external magnetic fields and can be aligned, in particular, by external magnetic fields. As the embedding matrix, the filler may comprise an adhesive, but preferably contains an adhesive-free matrix for the security feature, in particular a thermoplastic resin, a UV-crosslinking resin, an electron-beam crosslinking resin or a chemically film-forming resin. Further details of such a base substrate with hollow chamber, which is filled with a filling material containing a security feature, the German application with the application number DE 102011108477.4 be removed. In addition, it is also conceivable that the hollow chamber defined by the through hole of the base substrate and the two film layers has an internal imprint. Such a print is as well as a filling of Hollow chamber with a filler extraordinarily forgery-proof, since from the outside no access to the imprint or the filling material is possible.
  • It should be noted with regard to the composite film banknote described above with at least two-layer, in particular three-layered structure, that the film layers do not necessarily have to cover the base substrate substantially over the entire area. Conceivable, therefore, would be the arrangement of the two film layers (in a three-layer construction) only in the region of the hole track according to the invention. In the event that the film layers arranged in the region of the hole track are each formed as a self-supporting film, this variant has a base substrate with a hole and a hole track, the hole track being covered on both sides of the base substrate by a self-supporting film. Optionally, the self-supporting foil can have security elements in the area of the hole, e.g. Diffraction structures, matt structures, color-shifting layers, liquid crystal layers, etc., which are suitable for checking the authenticity.
  • The invention also encompasses a method for producing a base substrate of the type described above, in which the base substrate is produced in the form of a rectangular arc with a longitudinal direction and a transverse direction perpendicular thereto and is provided with at least one strip-shaped hole track extending along the longitudinal direction or the Transverse direction of the base substrate extends. In this case, a substrate dilution is produced in the first subregions of the hole track, and a hole extending through the substrate substrate is produced in the substrate dilution. In the second subregions of the hole track, a substrate thickening is produced.
  • The base substrate is preferably produced in a paper machine with a dewatering screen, wherein the substrate dilutions during the Papermaking be produced, preferably provided by the drainage screen surveys. The substrate thickenings are also preferably produced during papermaking, preferably by depressions provided on the dewatering screen. The substrate dilutions may alternatively be made by compressing the base substrate, for example, by calendering after papermaking.
  • The through hole is produced in an advantageous process variant within the substrate dilutions already in papermaking. In another, likewise advantageous variant of the method, the through hole is produced only after papermaking by cutting, in particular laser cutting, or punching.
  • In a method for producing a value document, a base substrate of the type described above is laminated with at least one film, the laminated base substrate is wound on a roll for Kaschierkleberaushärtung and from the cured laminated base substrate, a value document, in particular a film composite banknote generated.
  • The invention also encompasses a dewatering screen for the production of a base substrate of the type described, wherein the dewatering screen has at least one strip-shaped hole track which extends along the longitudinal direction or the transverse direction of the dewatering screen, and wherein the strip-shaped hole track has elevations in the first partial areas for generating substrate dilutions in the substrate Contains base substrate and contains wells in the second sub-areas for the production of substrate thickening in the base substrate.
  • Advantageously, a hole type for producing a through hole in the base substrate is provided in the first subregions of the dewatering screen.
  • In an advantageous variant of the invention, the strip-shaped hole tracks of the dewatering screen each consist of the first, raised partial areas and the second, recessed partial areas, that is, each part of a perforated track lies either in an elevation or in a depression.
  • In a further, likewise advantageous variant of the invention, the strip-shaped hole tracks of the dewatering screen have, in addition to the first and second partial areas, also third partial areas with a screen height that is unchanged from the outside area outside the hole track. In this case, the third subregions are either completely arranged within the second subregions or represent interruptions of the second subregions transversely to the strip-shaped hole track. Such interruptions of the recessed second subregions can ensure that sufficient paper fibers are held in the depressions during sheet formation.
  • Advantageously, the third subregions of the dewatering screen are in the form of webs or non-linear patterns, as described in more detail above for the third subregions of the base substrate.
  • Since the first, second and third subregions of the dewatering screen respectively essentially represent the negatives of the first, second and third subregions of the base substrate, the statements made above in connection with the subregions of the base substrates apply correspondingly to the subregions of the dewatering screen.
  • In order to be able to produce even large-area paper thickening process reliable, the dewatering in advantageous embodiments in the Siebvertiefungen or in the recessed area of an injection molding insert substructures. In a first variant of the invention, it is provided that the abovementioned dewatering screen has a screen fabric with at least one system of interwoven, longitudinally running warp threads and weft threads extending transversely thereto, which form screen meshes of a predetermined screen mesh surface. The screen fabric has in the second subregions a screen recess with a contiguous recessed area, the outline shape of which corresponds to the outline shape of the paper thickening to be produced, and which is substantially completely provided with embossed substructures which enlarge the surface of the recessed area and the screen mesh area in the recessed area.
  • In a second variant of the invention, it is provided that the abovementioned dewatering screen for process-reliable production of large-area paper thickenings in the second partial areas contains a perforated injection-molded insert which has an insert recess with a contiguous recess area, the outline shape of which corresponds to the outline shape of the paper thickening to be produced, and which is substantially complete is provided with substructures which increase the surface roughness of the recessed area.
  • Further details on the production of large-area paper thickening and the case using dewatering meshes with substructures can be found in the German patent application filed on 18.12.2012 titled "Dewatering screen for papermaking" and the application number DE 10 2012 024 768.0 taken from the same applicant become
  • The paper thickenings described, in particular the large-area paper thickenings with a substantially constant thickness, can not only form the substrate thickenings of a hole track, but can also serve for edge stabilization of paper sheets, in particular in steel printing processing of composite film sheets (hybrid sheets). Conventionally, when printing in steel printing hybrid sheets often show a so-called parachute formation in the delivery, in which the sheet does not sail flat into the delivery, but the corners fall first down. This has disadvantages for the laying behavior of the sheets, as the corners with relatively high pressure on the fresh color of the underlying sheet to slide. This carries the risk that the colors smudge and deposit on the opposite arch.
  • As a remedy, a paper sheet can be provided, for example, with a large, circumferential paper thickening, which, as described above, can be produced with the aid of a suitably designed dewatering screen. The circumferential paper thickening stabilizes the paper sheet and avoids parachuting during processing. The paper thickening is advantageously outside the individual benefits of the paper sheet and is removed in a later step in the process of cutting the sheet.
  • Instead of a circumferential paper thickening, a paper sheet, for example, be stabilized by the fact that only the corner regions of the paper sheet are provided with large paper thickening, or that in addition to the two upper corners and the running between these corners A large area of paper thickening is provided on the edge area of the paper sheet in order to stabilize the entire leading edge of the paper sheet for the tray. Also, a plurality of oblique, spaced at the edge of the paper sheet extending strip is suitable to stabilize the sheet edge. By the width and the distance of the individual strips from each other, the additional basis weight and thus the effect of the paper thickening can be varied and adjusted as desired, so that a different storage behavior of different paper sheets can be readily taken into account. Further details on the stabilization of paper sheets by large-scale paper thickening can the German patent application filed on 18.12.2012 titled "Entwvässerungssieb for papermaking" and the application number DE 10 2012 024 768.0 taken from the same applicant.
  • A stabilization of paper sheets, hybrid sheets and other substrate sheets, for example, with the aim to counteract the above-mentioned parachuting, can also be achieved by applying a stabilizing layer to the sheet. The application can be effected in particular by a printing process, for example in the form of a color or lacquer print, but also by other coating methods. The stabilization layer may in particular, as well as the paper thickening described above, circulate the sheet edge, be provided in corner regions and optionally in an edge region connecting the corners, or be formed in the form of a plurality of oblique, spaced at the edge of the sheet extending strip. Further details on the stabilization of paper sheets by an applied stabilizing layer can be found in the German Patent Application filed Dec. 18, 2012 titled "Substrate Sheet for the production of security and value documents "and the application number DE 10 2012 024 768.0 taken from the same applicant.
  • Overall, the invention achieves the following advantages in particular:
    • Optimized window quality through adapted topography of the base substrate, especially high window quality with sharp window margins and minimal air inclusions;
    • a homogeneous winding pressure distribution within a production roll;
    • High process reliability due to reduced influence of machine parameters, in particular draws, winding pressure, winding temperature, laminating pressure, laminating temperature, application temperature, air and paper moisture and storage temperature, and due to reduced influence of adhesive and curing parameters.
  • Further exemplary embodiments and advantages of the invention are explained below with reference to the figures, in the representation of which a representation true to scale and proportion has been dispensed with in order to increase the clarity.
  • Show it:
  • Fig. 1
    a schematic representation of a film composite banknote with an integrated security element,
    Fig. 2
    a cross section through the banknote of Fig. 1 along the line II-II,
    Fig. 3
    a paper sheet rolled up on a production roll, laminated with foils,
    Fig. 4
    a detail of a base substrate according to the invention in the form of a security paper sheet,
    Fig. 5
    an inventive base substrate in the form of a single use,
    Fig. 6
    in (a) to (c) three cross sections through the base substrate of Fig. 5 along the lines AA, BB and CC,
    Fig. 7
    in (a) a security paper sheet rolled up on a production roll according to the invention and in (b) a schematic cross-section through the laminated security paper sheet of (a) along the line BB rolled up on the production roll,
    Fig. 8
    in (a) a cross-section through a dewatering screen according to the invention in areas serving for the production of substrate dilutions, (b) a corresponding cross-section through the paper web produced therewith, (c) the paper web of (b) after the production of through-holes with a sharp one Rand, and in (d) is a cross section through the dewatering screen of (a) in areas that serve to produce substrate thickening, and
    Fig. 9
    a base substrate in the form of a single use according to a further embodiment of the invention.
  • The invention will now be explained in more detail using the example of banknotes. Fig. 1 shows a schematic representation of a three-layer film composite banknote 10 with a layer structure film / paper / foil, in which a security element 12 is integrated in the form of a see-through window. The film composite banknote 10 is in Fig. 2 in cross section along the line II-II of Fig. 1 shown in more detail.
  • With reference to the cross section of Fig. 2 contains the film composite banknote 10 in the region of the security element 12, an inner paper layer 20, the thickness of which is substantially constant outside a hole track 42 described in more detail below with a hollow chamber 22. This substantially constant thickness is referred to as the substrate thickness S.
  • The hole track 42 represents an approximately 2 cm wide strip which extends parallel to one of the outer edges of the banknote 10. In the in Fig. 2 In the thinned region 36, the substrate thickness decreases from the substrate thickness S to a hollow chamber depth H at the edge of the through-hole 38. In the thinned region 36, the substrate thickness decreases from the substrate thickness S to a hollow chamber depth H at the edge of the through hole 38 ,
  • In order to form the film composite banknote 10, the paper layer 20 is covered in each case with a transparent laminate film 26, 28 on its two opposite sides. The distance between the two opposing laminate films 26, 28 in the region of the through hole 38 defines a filling height A for the hollow chamber 22, which is generally different from both the Substrate thickness S and the hollow chamber depth H may differ, as in Fig. 2 illustrated. Through the through hole 22 in the paper layer 20 and the two laminate films 26, 28 a hollow chamber 22 is provided in the banknote 10, which is filled with a filling material 30 with a security feature. For example, the hollow chamber 22 may be filled with a binder 32 having platelet-like effect pigments 34 of crosslinked liquid crystals which exhibit a characteristic color-shift effect. The filled hollow chamber 22 forms an oval viewing window 24 with a color-shift effect in the film composite banknote 10.
  • In the production of such banknotes 10, a plurality of individual uses are always produced on a foil-laminated paper sheet and rolled up on a production roll 40, as in FIG Fig. 3 shown. In the hole tracks 42, as in the Figures 1 and 2 shown the see-through window 24 of the individual use included, it turns because of the lack of substance there compared to the outer regions 44 reduced winding pressure. The reduced winding pressure during the Kaschierkleberaushärtung lead to a relaxation of the films 26, 28 and thus to poor quality of the see-through window 24, such as blurred window edges, air pockets or ghosting.
  • By using a base substrate with a substrate thickening in the hole track, which is described in more detail below, these problems are greatly reduced or completely avoided, and a virtually uniform and homogeneous winding pressure can be ensured within the laminated roll during the curing phase.
  • Fig. 4 shows a section of a base substrate according to the invention in the form of a security paper sheet 50, a plurality of individual benefits 52 corresponds to the later cut banknotes 10. The security paper sheet 50 shown in the figure only in section is rectangular and has a longitudinal direction LB (the transport direction) and a transverse direction QB perpendicular thereto.
  • In Fig. 5 is a single benefit 52 shown in more detail. Also, the single-use 52 itself has a longitudinal direction LE and a transverse direction QE, which are perpendicular to the longitudinal or transverse direction of the arc 50 in the embodiment. Both the security paper sheet 50 and a single-use 52 each constitute a base substrate in the sense of the present invention.
  • The security paper sheet 50 of the Fig. 4 formed base substrate has a plurality of strip-shaped hole traces 54 which extend along the longitudinal direction LB of the security paper sheet 50. In the outer regions 66 outside the hole tracks 54, the security paper sheet 50 has a constant substrate thickness. The hole tracks 54 consist of first and second subregions 56, 58, wherein the first subregions 56 each contain a substrate dilution 60 and in the substrate dilution a hole 62 passing through the security paper sheet 50. The terms "substrate dilution" and "substrate thickening" respectively refer to the substantially constant substrate thickness of the outer regions 66, ie, in the region of the substrate dilution 60, the thickness of the substrate is smaller and in the region of Substrate thickening 64, the thickness of the substrate is greater than in the outer region 66th
  • In an analogous manner, this has the individual 52 of the Fig. 5 formed base substrate on a strip-shaped hole track 54, which along the Transverse direction QE of the single-use 52 extends. The hole track 54 again comprises first and second subregions 56, 58, wherein the first subregions 56 each contain a substrate dilution 60 and, in the substrate dilution, a hole 62 that extends through the individual end 52. The second subregions 58 each contain a substrate thickening 64. Here, too, the substrate thickness in the outer regions 66 outside the hole track 54 is substantially constant.
  • Fig. 6 shows in (a) to (c) three cross sections through the base substrate (security paper sheet 50 or individual 52) along the lines AA, BB and CC of Fig. 5 , With reference first to Fig. 6 (a) and the section perpendicular to the hole track 54 in the region of the through hole 62, the base substrate in the outer region 66 has a constant layer thickness S 0 , for example, S 0 = 90 microns. In the region of the substrate dilution 60 of the hole track 54, the substrate thickness in a direction perpendicular to the strip-shaped hole track 54 decreases continuously from the substrate thickness S 0 to a substrate thickness S thin at the edge of the through hole 62 and from the opposite edge of the hole 62 starting from the substrate thickness S thin again continuously until the constant layer thickness S 0 of the outer region 66 is reached. The substrate thickness S thin at the edge of the through hole 62 may be, for example, S thin = 30 μm.
  • The hole 62 may be a hole with a sharply defined edge, such as may be made by laser cutting or punching after sheet formation. Alternatively, the hole 62 can also be produced during sheet formation and have characteristic irregularities in the edge region, which can not subsequently be produced on the finished paper. Such irregularities are particularly evident in the absence of a sharp cutting edge or irregular Attachment of fibers in the edge region and by protruding into the hole of individual fibers.
  • Fig. 6 (b) shows a section perpendicular to the hole track 54 in the region of the substrate thickening 64. In this case, the layer thickness of the substrate perpendicular to the hole track 54 increases continuously from the first substrate thickness S 0 to a substrate thickness S thick and subsequently decreases continuously again, until in the outer region 66 again the substrate thickness S 0 is reached. The maximum substrate thickness S thick reached in the middle of the substrate thickening 64 may be, for example, S thick = 120 μm.
  • Fig. 6 (c) shows a section parallel to the hole track 54, wherein the section shown extends from a partial region 58 with substrate thickening 64 through a partial region 56 with substrate dilution 60 and hole 62 to a further partial region 58 with substrate thickening 64. In the thickening region 64, the base substrate has the substrate thickness S thick = 120 .mu.m, in the region of the substrate dilution 60 the substrate thickness continuously drops to the substrate thickness S thin = 30 .mu.m at the edge of the through hole 62 and rises again continuously from the opposite edge of the hole 62 Layer thickness S thick . The layer thickness S 0 of the outer region 66 is shown by dashed lines for illustration.
  • If such a security paper sheet 50 according to the invention is rolled onto a production roll 70 after two-sided lamination with two laminating films, as in FIG Fig. 7 (a) 1, the amount of substance missing in the hole tracks 54 through the substrate dilutions 60 on the roller 70 is largely compensated by the excess amount of substance in the substrate thickenings 64. The winding pressure in the area of the hole tracks 54 and the outer regions 66 is therefore much more uniform than in the prior art designs.
  • To illustrate shows Fig. 7 (b) schematically shows a cross section through the laminated on the production role 70 laminated security paper sheet 50 along the line BB of Fig. 7 (a) , For clarity, the laminating films in the cross section of Fig. 7 (b) omitted and superimposed in the roll paper layers 50 ', 50 ", which are part of the same paper sheet 50 are provided alternately with different hatchings.
  • In the outer region 66 outside the hole tracks 54 are each paper areas with the constant substrate thickness S 0 on top of each other. In the area of the hole tracks 54, in addition to paper layers 50 'which have a substrate dilution 60 and a hole 62 in the region of the cross section BB, paper layers 50 "are also present which contain a substrate thickening 64 in the region of the cross section BB Substrate thickening 64 is achieved in the hole tracks 54 a total thickness that does not or only slightly different from the total thickness of the outer regions 66, so that sets a more uniform and homogeneous winding pressure in the roller 70.
  • In Fig. 7 (b) are idealized alternately a substrate dilution 60 and a substrate thickening 64 drawn on top of each other. However, in practice, because of the roll circumference increasing from the inside to the outside, holes 62 in adjacent paper layers 50 ', 50 "will also partly overlap or overlap one another. However, since a plurality of paper layers 50', 50" lie one above the other in a roll 70, the overall result In each case, the described compensation of the substrate dilutions 60 by the substrate thickenings 64 takes place in the hole tracks 54.
  • The relative proportion of superimposed substrate dilutions 60 and substrate thickenings 64 in the cross section of a hole track 54 (FIG. Fig. 7 (b) ) depends on the size ratio of the thinned and thickened portions 56, 58. If, for example, the thickened subregions 58 along the hole track 54 are twice as long as the thinned subregions 56, then in the cross section of a hole track 54 an average of twice as many substrate thickenings 64 as substrate dilutions 60. For complete thickness compensation, each substrate thickening 64 should therefore be about half compensate for a substrate dilution. The same applies to other proportions.
  • In order to achieve the best possible pressure balance, it is possible, for example, to proceed as follows: Based on the size and shape of the substrate dilutions 60, the quantity of substance ΔM thin which is missing from the outer region 66 is first estimated or calculated. The missing amount of substance ΔM thin is compensated by an excess amount of material ΔM thick provided in the substrate thickenings 64 in relation to the outer region 66. The uniformity of the winding pressure can be significantly improved even with an excess amount of material M thick = 0.1 * .DELTA.M thin . However, the excess amount of substance ΔM thick is preferably at least 0.5 * ΔM thin or even at least 0.8 * ΔM thin . The excess amount of material M thick is preferably even greater than ΔM thin , ie ΔM thick > 1.0 * ΔM thin , but will generally not exceed 2.0 * ΔM thin , ie ΔM thick ≤ 2.0 * ΔM thin .
  • By way of illustration, in a paper web having a paper weight of 75 g / m 2 and a thickness of S 0 = 90 μm, holes of a size of 1 cm × 1 cm and a distance of 7 cm from hole center to hole center should be evenly compensated by substrate thickening in the intermediate hole area , The missing amount of substance M thin is in this example .DELTA.M thin = 75 G / m 2 * 1 cm 2 = 7 . 5 mg ,
    Figure imgb0001
  • The missing amount of substance ΔM thin should be completely compensated by an excess amount of substance Δ M thick in the intermediate hole area, ie .DELTA.M thick = .DELTA.M thin = 7 . 5 mg
    Figure imgb0002
  • The subregion of the substrate thickening has an area of M thick = (7 cm - 1 cm) x 1 cm = 6 cm 2 with the above indications. If the excess amount of substance ΔM thick is evenly distributed on this surface, the result is an excess paper mass of .DELTA.M thick / A thick = 12 . 5 G / m 2 .
    Figure imgb0003
    So a total paper mass of 87.5 g / m 2 in the substrate thickening. This total paper mass corresponds to an average substrate thickness of S thick . av = 90 microns * 87 . 5 / 75 = 105 microns
    Figure imgb0004
    and thus an average additional thickness of .DELTA.S av = 105 microns - 90 microns = 15 microns ,
    Figure imgb0005
  • Since the substrate thickness in the region of the substrate thickening should not increase abruptly, but continuously, as in Fig. 6 (b) As illustrated, the maximum substrate thickness S thick must be greater than the average substrate thickness S thick, av . If one puts for the estimate a linear increase or decrease from S 0 to S thick and back to S 0 , the maximum additional thickness obviously results .DELTA.S Max = 2 * .DELTA.S av = 30 microns .
    Figure imgb0006
    So the maximum substrate thickness too S thick = S 0 + .DELTA.S Max = 120 microns ,
    Figure imgb0007
  • It is understood that the missing quantity of substance ΔM thin can also be calculated analogously for complicated shapes of the substrate dilution regions 60 and compensated for by an excess amount of substance ΔM thick in the thickening region.
  • Large-area paper thickening can be produced in the manner described above with a paper thickness that remains substantially constant even in the interior. In the field of paper thickening, modulations may also be present which originate from substructures of the dewatering screen, but whose modulation depth is in each case significantly smaller than the thickening itself.
  • The preparation of paper base substrates according to the invention can be carried out with a dewatering screen whose surface topography essentially represents the negative of the desired paper topography. This is with reference to the FIGS. 8 (a) to (d) explained in more detail. First shows Fig. 8 (a) a cross section through the dewatering screen 80 in areas that serve to generate substrate dilutions 60. For this purpose, the dewatering screen 80 has corresponding elevations 82 in the desired partial areas. After the addition of fiber mass, the detachment of the paper web and the other process steps, such as drying, pressing, gluing, etc., you get the in Fig. 8 (b) shown in the corresponding cross section Paper web 50, which has the desired substrate dilutions 60 in the areas of the sieve elevations 82.
  • In the exemplary embodiment, continuous holes 62 with a sharp edge are produced in the area of the substrate dilutions 60 by laser cutting 84 or punching, as in FIG Fig. 8 (c) shown. In other variants of the method, the holes can also be produced during sheet formation and have characteristic edge irregularities which result from an irregular accumulation of fibers in the edge region. For this purpose, for example, hole types having the shape of the desired holes 62 may be provided in the raised portions 82 of the dewatering screen.
  • Fig. 8 (d) shows a cross section through the dewatering screen 80 in areas that serve to produce substrate thickening 64. For this purpose, the dewatering screen 80 has corresponding recesses 86 in the desired subareas which, after the addition of fiber mass, the detachment of the paper web and the further method steps already mentioned above, produce the desired substrate thickenings 64 in the paper web.
  • As described above, the dewatering screen 80 can have substructures for the reliable production of large-area paper thickenings in the screen recesses or in the recessed area of an injection-molded insert. Further details and background are given in the German patent application incorporated by reference in the present application.
  • While in the previously described designs, the hole tracks each from the first and second portions with the substrate dilutions or substrate thickening, the hole tracks in other designs may also include third subregions in which the substrate thickness is substantially unchanged from the outside. Although the substrate thickness in the third subregions ideally coincides with the substrate thickness of the outer region, depending on the size and the arrangement of the third and second subregions, the substrate thickness of the third subregions may be slightly different than the substrate thickness of the outer region as a result of the production.
  • Fig. 9 shows for illustration a single use 90, which basically like the single 52 of the Fig. 5 is formed. In contrast to the individual benefit of Fig. 5 However, the second subregion 58 with the substrate thickenings 64 in the case of the single-use 90 is interrupted by web-shaped third subregions 92, in which the substrate thickness corresponds to the substrate thickness of the outer region 66. In the exemplary embodiment, the third subregions 92 form a mark of authenticity, namely a bar code 94 in which, for example, the denomination of the banknote 10 to be generated can be coded.
  • Non-linear third subregions also come into consideration according to the invention. For example, shows Fig. 9 in the hole track 54 in addition to the webs 92 and nubs 96, which also represent third portions with the substrate thickness of the outer region 66. In the exemplary embodiment, the dot pattern formed by the nubs 96 represents braille text information. In this way, additional information can be integrated into the base substrate or the banknote, which can serve, for example, as a reading aid for the visually impaired and / or as a further authenticity feature.
  • Such third subregions offer not only increased counterfeit security but also advantages in the production of the base substrates. In a design as in Fig. 5 The relatively large area of the substrate thickening 64 leads to correspondingly large recesses 86 in the dewatering screen 80. By providing the above-described third subregions 92, the depressions 86 in the dewatering screen 80 are interrupted, thereby ensuring that sufficient paper fibers are retained in the depressions 86 during sheet formation become.
  • The interruptions of the depressions 86 in the dewatering screen 80 advantageously produce further authenticity features in the base substrate, such as the bar code 94 or Braille 96. However, it is also possible that the third subregions represent only decorative and / or haptically detectable patterns within the substrate thickening, for example a Crosswalk, checkerboard or check pattern. Finally, it is also possible to inconspicuously integrate the third subregions into the substrate thickening 64, for example by distributing irregularly shaped third subregions within the second subregions. In this way, the third subregions are not noticeable visually or haptically and are therefore not perceived on a superficial level.
  • LIST OF REFERENCE NUMBERS
  • 10
    Foil composite banknote
    12
    security element
    20
    inner paper layer
    22
    hollow
    24
    Through window
    26, 28
    laminate film
    30
    filling material
    32
    binder
    34
    effect pigments
    36
    dilute area
    38
    through hole
    42
    hole track
    44
    exteriors
    50
    Sheet of security paper
    50 ', 50 "
    paper documents
    52
    individual benefits
    54
    hole traces
    56, 58
    subregions
    60
    substrate diluent
    62
    through hole
    64
    substrate thickening
    66
    outdoors
    70
    role
    80
    dewatering
    82
    surveys
    84
    laser cutting
    86
    wells
    90
    individual benefits
    92
    third subareas
    94
    barcode
    96
    burl

Claims (27)

  1. A base substrate, for a foil composite banknote, in the form of a rectangular sheet having a longitudinal direction and a transverse direction perpendicular thereto, that comprises at least one strip-shaped row of perforations that extends along the longitudinal direction or the transverse direction of the base substrate and that includes a substrate thinning in first sub-regions, and in the substrate thinning, a hole that goes through the base substrate, and that includes a substrate thickening in second sub-regions.
  2. The base substrate according to claim 1, characterized in that the base substrate has, outside the strip-shaped rows of perforations, a substantially constant first substrate thickness S0, and in that, in the region of the substrate thickening, the thickness of the substrate increases to a second substrate thickness Sthick that lies between 1.05* S0 and 2.0* S0, preferably between 1.10* S0 and 1.60* S0, particularly preferably between 1.20* S0 and 1.40* S0.
  3. The base substrate according to claim 2, characterized in that, in the region of the substrate thickening, the substrate thickness increases continuously, in a direction perpendicular to the strip-shaped row of perforations, from the first substrate thickness S0 to the second substrate thickness Sthick, and thereafter decreases again continuously to the first substrate thickness S0.
  4. The base substrate according to at least one of claims 1 to 3, characterized in that, in the region of the substrate thinning, the substrate thickness decreases continuously, in a direction perpendicular to the strip-shaped row of perforations, from the first substrate thickness S0 to a third substrate thickness Sthin at the edge of the through hole, and thereafter increases again continuously to the first substrate thickness S0.
  5. The base substrate according to at least one of claims 1 to 4, characterized in that the at least one strip-shaped row of perforations has a width between 0.2 cm and 10.0 cm, preferably between 0.5 cm and 3.0 cm.
  6. The base substrate according to at least one of claims 1 to 5, characterized in that the base substrate includes multiple parallel rows of perforations.
  7. The base substrate according to at least one of claims 1 to 6, characterized in that, for the missing quantity of material Δ Mthin in the substrate thinning in the row of perforations compared with the outer region outside the row of perforations, and the excess quantity of material ΔMthick in the substrate thickening compared with the outer region, the relationship ΔMthick = 0.1* Δ Mthin ... 2.0*Mthin, preferably ΔMthick = 0.5* ΔMthin ... 1.5* ΔMthin, particularly preferably ΔMthick = 0.8* ΔMthin ... 1.3* ΔMthin applies.
  8. The base substrate according to at least one of claims 1 to 7, characterized in that the through hole comprises a sharply delimited edge.
  9. The base substrate according to at least one of claims 1 to 7, characterized in that the through hole comprises, produced at paper manufacture, an edge having characteristic irregularities.
  10. The base substrate according to at least one of claims 1 to 9, characterized in that the strip-shaped rows of perforations are composed in each case of the first, thinned sub-regions and the second, thickened sub-regions.
  11. The base substrate according to at least one of claims 1 to 9, characterized in that the strip-shaped rows of perforations comprise, in addition to the first and second sub-regions, also third sub-regions having substantially unchanged substrate thickness compared with the outer region outside the row of perforations, the third sub-regions either being arranged completely within the second sub-regions or constituting interruptions of the second sub-regions transversely to the strip-shaped row of perforations.
  12. The base substrate according to claim 11, characterized in that the third sub-regions are formed in the shape of ridges, non-line-shaped patterns or in the shape of a motif.
  13. The base substrate according to claim 11 or 12, characterized in that the third sub-regions in the base substrate form an authenticating mark, especially a code, such as a one- or two-dimensional barcode or Braille lettering, or in that the third sub-regions in the base substrate form a pattern, especially a strip pattern.
  14. The base substrate according to at least one of claims 11 to 13, characterized in that irregularly shaped third sub-regions are distributed in the second sub-regions.
  15. The base substrate according to at least one of claims 1 to 14, characterized in that the base substrate is formed from paper, especially cotton paper or from paper having a proportion of polymer fibers.
  16. A value document, especially a foil composite banknote having a base substrate according to one of claims 1 to 15.
  17. The value document according to claim 16, characterized in that the value document is structured to be at least bi-layer and includes at least one foil ply and at least one base substrate according to one of claims 1 to 15.
  18. The value document according to claim 16 or 17, characterized in that the value document is structured to be at least tri-layer and includes at least one base substrate according to one of claims 1 to 15 that is embedded between two foil plies.
  19. The value document according to claim 18, characterized in that the through hole of the base substrate and the two embedding foil plies define a hollow chamber that is filled with a filling material having a security feature and/or comprises an internal imprint.
  20. A method for manufacturing a base substrate according to one of claims 1 to 15, in which the base substrate is produced, in a paper machine having a dewatering screen, in the form of a rectangular sheet having a longitudinal direction and a transverse direction perpendicular thereto and is provided with at least one strip-shaped row of perforations that extends along the longitudinal direction or the transverse direction of the base substrate, a substrate thinning being produced in first sub-regions of the row of perforations, and a hole that goes through the base substrate being produced in the substrate thinning, and a substrate thickening being produced in second sub-regions of the row of perforations.
  21. The method according to claim 20, characterized in that the substrate thinnings are produced during paper manufacture, preferably by elevations provided on the dewatering screen.
  22. The method according to claim 21, characterized in that the substrate thickenings are produced during paper manufacture, preferably by depressions provided on the dewatering screen.
  23. The method according to claim 21 or 22, characterized in that the through hole within the substrate thinnings is produced during paper manufacture.
  24. The method according to at least one of claims 20 to 22, characterized in that the through hole is produced after paper manufacture by cutting or punching.
  25. A method for manufacturing a value document, in which a base substrate according to one of claims 1 to 15 is laminated with at least one foil, the laminated base substrate is wound on a spool to set the laminating adhesive, and a value document, especially a foil composite banknote, is produced from the set laminated base substrate.
  26. A dewatering screen for manufacturing a base substrate according to one of claims 1 to 15 that comprises at least one strip-shaped row of perforations that extends along the longitudinal direction or the transverse direction of the dewatering screen, the strip-shaped row of perforations including, in first sub-regions, elevations for producing substrate thinnings in the base substrate, and including, in second sub-regions, depressions for producing substrate thickenings in the base substrate.
  27. The dewatering screen according to claim 26, characterized in that a hole model is provided in the first sub-regions for producing a through hole.
EP12008410.8A 2011-12-22 2012-12-18 Base substrate for a film composite bank note Active EP2607550B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE102011122113A DE102011122113A1 (en) 2011-12-22 2011-12-22 Base substrate, used for composite film banknote in form of rectangular sheet, comprises parallel strip-shaped perforated tracks that extend along longitudinal/transverse direction of the substrate and contain a substrate dilution
DE201210024774 DE102012024774A1 (en) 2012-12-18 2012-12-18 Drainage screen for papermaking
DE102012024768.0A DE102012024768A1 (en) 2012-12-18 2012-12-18 Substrate sheet for the production of security and value documents

Publications (3)

Publication Number Publication Date
EP2607550A1 EP2607550A1 (en) 2013-06-26
EP2607550A8 EP2607550A8 (en) 2013-07-31
EP2607550B1 true EP2607550B1 (en) 2017-02-22

Family

ID=47562920

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12008410.8A Active EP2607550B1 (en) 2011-12-22 2012-12-18 Base substrate for a film composite bank note

Country Status (1)

Country Link
EP (1) EP2607550B1 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10163381A1 (en) * 2001-12-21 2003-07-03 Giesecke & Devrient Gmbh Security paper and method and device for its production
DE10243653A1 (en) 2002-09-19 2004-04-01 Giesecke & Devrient Gmbh Security paper
DE102010034693A1 (en) * 2010-08-18 2012-02-23 Giesecke & Devrient Gmbh Method for producing a security paper and round screen for it

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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EP2607550A1 (en) 2013-06-26

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