EP2753754A2 - Method for producing a security paper and microlens thread - Google Patents

Method for producing a security paper and microlens thread

Info

Publication number
EP2753754A2
EP2753754A2 EP12769595.5A EP12769595A EP2753754A2 EP 2753754 A2 EP2753754 A2 EP 2753754A2 EP 12769595 A EP12769595 A EP 12769595A EP 2753754 A2 EP2753754 A2 EP 2753754A2
Authority
EP
European Patent Office
Prior art keywords
microlens
paper web
web
thread
areas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP12769595.5A
Other languages
German (de)
French (fr)
Other versions
EP2753754B1 (en
EP2753754B2 (en
Inventor
Rudolf Seidler
Manfred Heim
Bernhard Wiedner
Michael Rahm
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
Original Assignee
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
Family has litigation
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Application filed by Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
Publication of EP2753754A2 publication Critical patent/EP2753754A2/en
Publication of EP2753754B1 publication Critical patent/EP2753754B1/en
Application granted granted Critical
Publication of EP2753754B2 publication Critical patent/EP2753754B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B42D25/40—Manufacture
    • B42D25/45—Associating two or more layers
    • B42D25/465—Associating two or more layers using chemicals or adhesives
    • B42D25/47—Associating two or more layers using chemicals or adhesives using adhesives
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
    • D21H21/42—Ribbons or strips
    • 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
    • B42D25/355—Security threads
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/006—Making patterned paper
    • B42D2033/22—
    • B42D2033/24—
    • B42D2035/20—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/324—Reliefs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/346—Perforations
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2933—Coated or with bond, impregnation or core

Definitions

  • the invention relates to a method for producing a security paper, as well as a microlens threads for introduction into a paper web with such a method.
  • Security documents such as banknotes, stocks, bonds, certificates, vouchers, checks, high-quality admission tickets, but also other forgery-prone papers, such as passports or other identity documents, are often provided with security elements for the purpose of security, which allow the authenticity of the value document to be checked which also serve as protection against unauthorized reproduction.
  • the security elements can be designed, for example, in the form of a security thread completely or partially embedded in a banknote.
  • microlens security threads have become established on the banknote market. These microlens filaments differ significantly from metallized filaments and offer attractive optical properties.
  • the microlens threads are equipped with microlenses whose focusing effect is produced by refraction of light on an approximately spherically curved surface.
  • microstructures In the focal plane of the microlenses are microstructures that are arranged so that the interaction of the microlenses and the microstructures for the viewer can represent an enlarged image with special motion effects.
  • the lens side of the thread is not provided with adhesive prior to embedding in a paper web, as with conventional security threads, such as hologram threads. which is the case.
  • conventional security threads such as hologram threads.
  • the present invention seeks to avoid the disadvantages of the prior art and in particular to provide a method for producing a security paper, which allows a secure embedding of a microlens thread in the paper and at the same time in the window areas in which the microlens thread on the Surface of the paper, ensuring an attractive visual appearance of the microlens thread.
  • an endless microlens thread is provided, which has an upper side and an opposite lower side, wherein the upper side is provided with microlenses at least in partial areas,
  • a paper web having a predetermined web pattern is produced, which has land regions in which the microlens thread is embedded in the interior of the paper web, and which has window regions lying between the web regions, in which the microlens thread protrudes on the surface of the paper web, and E) of the Mikrolinsenf Aden introduced into the paper web and is connected on its underside and in the web areas also on its upper side with the paper web, wherein the paper web forms the safety paper with the introduced Mikrolinsenfaden.
  • the microlens thread is provided on its upper side with an adhesive layer in the form of the web pattern prior to introduction into the paper web and the microlens thread registered in step E) is introduced into the paper web so that the regions coated with adhesive of the microlens thread coincide with the web portions of the paper web.
  • a registered introduction of the microlens thread can be carried out in particular according to one of the methods described in the publication WO 2004/050991 Al.
  • the disclosure of this document is included in the present application in this respect.
  • the microlens thread may include a motif with a motif jump.
  • a motif with a motif jump As described in more detail in the publication WO 2008/145333 A2, in the production of a microlens thread initially an endless security element film is produced as a roll material, which always occur when using conventional manufacturing methods break points, especially gaps or a misalignment in the appearance of the security elements. These fractures are due to the fact that the precursors for the embossing tools used in the production in general are produced as flat plates, which are mounted on a printing or embossing cylinder. At the seams, the mutually adjacent image patterns usually do not match and lead after printing or embossing in the appearance of the finishedforce- elements to a jump of the kind mentioned.
  • a microlens thread, a motif with a Motive jump contains, registered introduced into the paper web, so that the motif jump comes to rest in one of the web areas of the paper web. The subject jump then remains hidden from the viewer.
  • subject jumps occur several times within an embossing cylinder.
  • the patterns are composed by recombination of small segments, stitches with motif jumps result.
  • motive jumps occur due to the process both in the grid of the microstructures and in the grid of the microlenses.
  • the microlens thread is printed directly before entering the paper web targeted in the areas of its upper side with an adhesive layer, which come to lie in the sheet formation below land areas of the paper web.
  • the microlens thread is provided with a plurality of openings in an opening region in the form of the web pattern before being introduced into the paper web, and the microlens filament in step E) is registered in the paper web, so that the apertured regions of the microlens filament coincide with the web regions of the paper web.
  • the microlens thread can contain a motif with a motif jump and the microlens thread can be registered, so that the motif jump comes to rest in one of the web areas of the paper web and is therefore hidden from the viewer.
  • the microlens thread is provided in the areas of its upper side with openings, which come to rest below the land areas of the paper web during sheet formation, immediately before entering the paper web.
  • the openings are advantageously produced by punching or laser cutting. If the openings are produced in the paper web only immediately before the shrinkage of the microlens thread, they are preferably produced by laser cutting.
  • the paper web is expediently formed with the predetermined web pattern in a paper machine and the endless microlens thread runs into the paper machine.
  • a microlens thread is provided whose upper side has partial areas with microlenses and microlens-free partial areas, the microlens-free partial areas being smaller than the width of the bridge areas of the Web pattern are in the paper web, and wherein the microlens-free portions are coated prior to introduction into the paper web with adhesive.
  • the microlens thread is introduced into the paper web in an unregistered manner so that microlenses are at least partially visible in each window region and always a portion of the adhesive-coated subregions come to rest beneath web regions of the paper web.
  • a microlens thread is provided which on the one hand has partial regions with microlenses, which partial regions are coated with adhesive before being introduced into the paper web and which are smaller than the width of the web regions of the web pattern in the paper web on the other hand, have partial areas with microlenses which are not coated with adhesive before being introduced into the paper web.
  • the microlens thread is introduced in particular unregistered in the paper web, so that in each window area at least partially microlenses that have no adhesive coating, can be seen and always come to lie part of the adhesive-coated portions below web portions of the paper web.
  • the microlens thread is advantageously provided over its entire surface with an adhesive layer before being introduced into the paper web on its underside.
  • the invention also includes a microlens thread for insertion into a paper web, in particular with the method just described.
  • the microlens thread includes a top and an opposite bottom, the upper side having partial areas with microlenses and microlens-free partial areas which are coated with adhesive.
  • microlens sections and the microlens-free sections advantageously form alternating strips on the upper side of the thread, each of which completely occupies the width of the microlens thread and in each case has an extension of between 1 mm and 30 mm, preferably between 3 mm and 12, in the longitudinal direction of the microlens thread mm have.
  • the microlens sections and the microlens-free sections may usually be in the form of rectangles. However, it would also be possible for the partial areas with microlenses and the microlens-free partial areas to be present in the form of diagonals. It can be made especially for wider threads diagonal paper webs.
  • the underside of the microlens thread is preferably coated over the entire surface with adhesive.
  • FIG. 1 is a schematic representation of a banknote according to the invention with an embedded microlens thread
  • 2 shows a plan view of the microlens thread of FIG. 2, a plan view of another microlens thread before embedding in a security paper
  • FIG 5 shows a cross-section of the microlens thread of FIG. 5, a cross section of a security paper with an embedded microlens thread according to FIGS. 5 and 6, a cross section of the microlens thread according to the invention; and a cross section of a security paper with an embedded microlens thread according to FIG. 8.
  • FIG. 1 shows a schematic representation of a bank note 10 produced according to the invention with a micro-optical window security thread 12, which is also referred to below as a microlens thread.
  • the microlens thread 12 emerges in window areas 14 on the surface of the banknote 10, while it is embedded in the interposed web areas 16 in the interior of the banknote 10.
  • the microlens thread 12 illustrated in FIGS. 2 and 4 is used for the production of a security paper.
  • FIG. 3 shows a cross-section of the security paper 50 with the microlens thread 12 already embedded.
  • FIG. 2 shows a schematic of the layer structure of the microlens thread 12 prior to embedding in the security paper, wherein only the parts of the layer structure required for explaining the functional principle are shown.
  • FIG. 4 shows a plan view of the microlens thread 12 of FIG. 2.
  • the microlens thread 12 contains a carrier 20 in the form of a transparent plastic film, for example a PET film about 20 .mu.m thick.
  • the upper side 30 of the microlens thread 12 has a grid-like arrangement of microlenses 22 which form a grid with a preselected symmetry on the surface of the carrier foil.
  • the spherically or aspherically ausgestaltet microlenses 22 preferably have a diameter between 5 ⁇ and 50 ⁇ and in particular a diameter between only 10 ⁇ and 35 ⁇ and are therefore not visible to the naked eye. It is understood that in other designs also larger or smaller Dimensions come into question. The use of cylindrical lenses is possible in the same way.
  • a motif layer 26 is arranged, which contains a likewise grid-shaped arrangement of micromotiv elements 28.
  • the arrangement of the micromotif elements 28 also forms a lattice with a preselected symmetry, wherein the tuning of the lattice of the microlenses 22 and the arrangement of the micromotif elements 28 produces a desired magnification effect, characteristic movement effects and / or tilting effects.
  • the micromotif elements are invisible to the naked eye. Reference is additionally made at this point to WO 2009/000528 A1, in which it is stated that the microstructures can also consist of image fragments which are not arranged repetitively.
  • the microlens thread 12 typically includes other layers 24, such as protective, masking or other functional layers, which are not essential to the present invention and therefore will not be described further.
  • the motif perceived by the viewer usually has a motif jump, as described in more detail, for example, in document WO 2008/145333 A2.
  • a paper web 50 is now produced on the round screen of a paper machine with a predetermined web pattern 18 (FIG.
  • the web pattern 18 has land areas 16 in which the microlens thread 12 is embedded later in the interior of the finished paper web 50. Between the web portions 16 are window areas 14 in which the microlens thread 12 emerges on the surface of the finished paper web 50.
  • the microlens fiber 12 is provided on its upper side 30 with an adhesive layer 40 in the form of the web pattern 18 before being introduced into the paper web 50, so that the adhesive layer 40 forms an adhesive pattern 48 whose Sequence of uncoated areas 44 and coated areas 46 of the sequence of window areas 14 and web portions 16 of the web pattern 18 corresponds.
  • the underside 32 of the microlens thread 12 is provided with a full-surface adhesive layer 42.
  • This microlens thread 12 thus coated with adhesive 40, 42 is then registered in the paper web 50, so that the adhesive-coated regions 46 of the microlens thread coincide with the web regions 16 of the paper web 50, as shown in FIG.
  • the microlens thread 12 can be introduced by means of a coil under pretension in the paper web.
  • a first sensor detects the position of the coated regions 46 shortly before being introduced into the paper web
  • a second sensor detects the position of the webs 16 formed in the paper web immediately after sheet formation.
  • the positions detected by the two sensors are evaluated and used to control the magnitude of the bias voltage.
  • the bias voltage is increased, the microlens thread 12 is stretched more, and when the preload is lowered, the elongation is reduced.
  • the microlens thread 12 can be aligned in this manner with its coated and uncoated areas 44, 46 in register on the window and web areas 14, 16.
  • the method is such that the thread carries a register mark, which is recognized particularly well by a detection system.
  • the thread embedding is then controlled by means of the tension on the thread so that the register mark of the thread is in fixed local reference to the register mark of the paper, usually a watermark.
  • the areas in which the thread has adhesive on the top are then in a fixed, known local reference to the register mark of the thread.
  • the land areas in the paper are in fixed local relation to the register mark in the paper.
  • the uncoated regions 44 and the coated regions 46 have, in advantageous embodiments, the same size as the window regions 14 or the land regions 16. In some embodiments, it is also provided that the coated regions 46 are smaller, for example by not more than 10% or not more than 50% smaller than the land areas 16.
  • the glue-coated part compared to the paper webs thread length is also very much related to the register tolerance of registered thread embedding. For example, if the registration allowance is ⁇ 1 mm registered thread insertion, the glue-free areas of the thread should be 2 mm shorter than the paper webs. Even if only a part of the microlens thread 12 is glued to the web areas 16, a significantly improved embedding results compared with the prior art.
  • the uncoated regions 44 are slightly smaller than the window regions 14 come into consideration.
  • the focusing effect of adhesive-loaded microlenses 22 in the window regions 14 is reduced or eliminated, so that the uncoated regions 44 are preferably smaller by no more than 10%, particularly preferably not more than 5%, than the window regions 14.
  • Another advantage the registered introduction of the microlens thread 12 is that any potential jumps 34 in the motif image can be hidden under a paper web 16 of the security paper 50, as shown in Fig. 3. Thereby, the uniformity of the visual appearance of the microlens thread 12 is further increased.
  • the microlens filament 12 is introduced into the paper web 50 in a registered manner, but is printed with an adhesive pattern 48 just before entering the papermachine so that the coated regions 46 penetrate into the recessed portions of the round screen. in which the paper webs 16 form, come to rest.
  • a sensor can detect the position of the webs 16 formed during sheet formation in the paper web, and the detected position can be used to control the printing positions for the adhesive pattern 48. In this way too, the uncoated teten and coated areas 44, 46 register exactly on the window and web areas 14, 16 are aligned.
  • FIGS. 5 to 7 show a plan view and a cross section of the microlens thread 60 prior to embedding in the security paper
  • FIG. 7 shows a cross section of the security paper 50 with the embedded microlens thread 60.
  • the microlens thread 60 becomes on its upper side 30 is not coated with adhesive, but it is provided prior to introduction into the paper web 50 with an opening pattern 68 in the form of the web pattern 18.
  • the opening pattern 68 consists of a sequence of regions 66 with openings 62 and regions 64 without openings, which corresponds to the sequence of the land regions 16 and window regions 14 of the web pattern 18.
  • the underside 32 of the microlens thread 60 is preferably provided with a full-surface adhesive layer 42.
  • the microlens thread 60 is registered in the paper web 50, so that the apertured areas 66 of the microlens thread 60 coincide with the web areas 16 of the paper web 50, as already described in principle in connection with FIGS. 2 to 4.
  • the first sensor in this case detects the position of the openings 62 just before the introduction of the microlens thread 12 into the paper web. In this way, the microlens thread 60 can be aligned in register with the window and web regions 14, 16 with its opening pattern 68.
  • the openings 62 that in the formation of paper under the web portions 16 paper fibers or other constituents of the substrate 50 may penetrate through the openings 62 to establish communication between the land areas 16 and the substrate material 52 under the microlens filament 60 (FIG. 7). This also results in an intimate connection of paper web 50 and microlens thread 60 and thus secure embedding without wrinkling being achieved. Since the top 30 of the microlens thread 60 remains adhesive-free, the optical properties of the microlenses 22 are not compromised.
  • the openings 62 may for example be punched or produced by laser cutting.
  • Each region 66 may include one or more apertures 62.
  • FIGS. 6 and 7 show a design with only one opening 62 per area 66
  • FIG. 5 illustrates a design with three openings 62 per area 66.
  • the microlens thread 60 is not registered registered in the paper web 50, but it is only immediately before entering the paper machine by laser exposure so provided with the opening pattern 68 that the areas 66 with openings 62 in the recessed portions of Rundsiebs, in which the paper webs 16 form, come to rest.
  • a sensor can detect the position of the webs 16 formed in the paper web and the detected position can be used to control the laser beam. Also in this way, the opening pattern 68 register exactly on the window and web portions 14, 16 are aligned.
  • a microlens thread 70 is used which has on its upper side 30 a sequence of partial regions 74 with microlenses 22 and microlens-free partial regions 76.
  • the motif layer and any further layers th of the microlens thread 70 are not shown in FIGS. 8 and 9 for the sake of clarity.
  • the microlens-free portions 76 of the top 30 are coated with adhesive 40 and the underside of the microlens thread 70 is coated over its entire surface with adhesive 42.
  • the adhesive-coated, microlens-free subregions 76 are smaller than the width of the window regions 14 of the web pattern 18. This ensures that microlenses 22 can be seen at least in certain regions during the unregistered introduction of the microlens thread 70 into a security paper 50 in each window region 14 (FIG. 9).
  • the areas coated with adhesive may well also have microlenses. Although these would be optically ineffective due to the adhesive coating, they permit a uniform configuration of the thread with microlenses.
  • the microlens-free regions diagonally or in strips along the thread and thus optionally to provide areas over the entire length of the thread which coat with adhesive can be.
  • the adhesive or adhesive used in the present invention may be, for example, a heat sealing lacquer.
  • the adhesive may moreover have security features, for example dyes or color pigments and luminescent substances.

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  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Credit Cards Or The Like (AREA)
  • Paper (AREA)

Abstract

The invention relates to a method for producing a security paper, wherein M) an endless microlens thread (12) having a top side (30) and an opposite underside (32) is provided, wherein the top side (30) is provided with microlenses (22) at least in partial regions, P) a paper web (50) is produced with a predetermined bridge pattern (18), which has bridge regions (16), in which the microlens thread (12) is embedded within the paper web (50), and which has window regions (14) situated between the bridge regions (16), in which window regions the microlens thread (12) emerges at the surface of the paper web (50) and e) the microlens thread (12) is introduced into the paper web (50) and in the process is connected to the paper web (50) on the underside (32) of said thread and, in the bridge regions (16), also on the top side (30) of said thread, wherein the paper web (50) together with the introduced microlens thread (12) forms the security paper.

Description

Verfahren zur Herstellung eines Sicherheitspapiers und Mikrolinsenfäden  Method for producing a security paper and microlens threads
Die Erfindung betrifft ein Verfahren zur Herstellung eines Sicherheitspa- piers, sowie einen Mikrolinsenfäden zum Einbringen in eine Papierbahn mit einem derartigen Verfahren. The invention relates to a method for producing a security paper, as well as a microlens threads for introduction into a paper web with such a method.
Wertdokumente, wie beispielsweise Banknoten, Aktien, Anleihen, Urkunden, Gutscheine, Schecks, hochwertige Eintrittskarten, aber auch andere fäl- schungsgefährdete Papiere, wie Pässe oder sonstige Ausweisdokumente, werden zur Absicherung oft mit Sicherheitselementen versehen, die eine Überprüfung der Echtheit des Wertdokuments gestatten und die zugleich als Schutz vor unerlaubter Reproduktion dienen. Die Sicherheitselemente können beispielsweise in Form eines in eine Banknote ganz oder teilweise einge- betteten Sicherheitsfadens ausgebildet sein. Security documents, such as banknotes, stocks, bonds, certificates, vouchers, checks, high-quality admission tickets, but also other forgery-prone papers, such as passports or other identity documents, are often provided with security elements for the purpose of security, which allow the authenticity of the value document to be checked which also serve as protection against unauthorized reproduction. The security elements can be designed, for example, in the form of a security thread completely or partially embedded in a banknote.
In den letzten Jahren haben sich Sicherheitsfäden mit Mikrolinsen auf dem Banknotenmarkt etabliert. Diese Mikrolinsenfäden unterscheiden sich deutlich von metallisierten Fäden und bieten attraktive optische Eigenschaften. Die Mikrolinsenfäden sind auf der dem Betrachter zugewandten Seite mit Mikrolinsen ausgestattet, deren fokussierende Wirkung durch Lichtbrechung an einer annähernd sphärisch gekrümmten Oberfläche entsteht. In der Fokusebene der Mikrolinsen befinden sich Mikrostrukturen, die so angeordnet sind, dass sich durch das Zusammenwirken der Mikrolinsen und der Mikrostrukturen für den Betrachter ein vergrößertes Bild mit speziellen Bewegungseffekten darstellen lässt. In recent years, microlens security threads have become established on the banknote market. These microlens filaments differ significantly from metallized filaments and offer attractive optical properties. On the side facing the observer, the microlens threads are equipped with microlenses whose focusing effect is produced by refraction of light on an approximately spherically curved surface. In the focal plane of the microlenses are microstructures that are arranged so that the interaction of the microlenses and the microstructures for the viewer can represent an enlarged image with special motion effects.
Um die fokussierende Wirkung der Mikrolinsen und damit den optischen Effekt des Mikrolinsenfadens nicht zu beeinträchtigen, wird die Linsenseite des Fadens vor der Einbettung in eine Papierbahn nicht mit Klebstoff versehen, wie dies bei herkömmlichen Sicherheitsfäden, wie etwa Hologrammfä- den der Fall ist. Allerdings führt der Verzicht auf Klebstoff auf der Oberseite des Fadens (Linsenseite) oft zu einer verringerten Haltbarkeit der erzeugten Banknoten und teilweise sogar zu einer Faltenbildung auf der Banknotenrückseite. In order not to impair the focusing effect of the microlenses and thus the optical effect of the microlens thread, the lens side of the thread is not provided with adhesive prior to embedding in a paper web, as with conventional security threads, such as hologram threads. which is the case. However, dispensing with adhesive on the top of the thread (lens side) often results in reduced durability of the produced banknotes and in part even wrinkling on the banknotes back.
Davon ausgehend liegt der Erfindung die Aufgabe zugrunde, die Nachteile des Standes der Technik zu vermeiden und insbesondere ein Verfahren zur Herstellung eines Sicherheitspapiers anzugeben, das eine sichere Einbettung eines Mikrolinsenfadens in das Papier ermöglicht und das zugleich in den Fensterbereichen, in denen der Mikrolinsenfaden an der Oberfläche des Papiers hervortritt, ein attraktives visuelles Erscheinungsbild des Mikrolinsenfadens gewährleistet. Based on this, the present invention seeks to avoid the disadvantages of the prior art and in particular to provide a method for producing a security paper, which allows a secure embedding of a microlens thread in the paper and at the same time in the window areas in which the microlens thread on the Surface of the paper, ensuring an attractive visual appearance of the microlens thread.
Diese Aufgabe wird durch die Merkmale der unabhängigen Ansprüche gelöst. Weiterbildungen der Erfindung sind Gegenstand der Unteransprüche. This object is solved by the features of the independent claims. Further developments of the invention are the subject of the dependent claims.
Nach der Erfindung ist bei einem gattungsgemäßen Verfahren vorgesehen, dass According to the invention, it is provided in a generic method that
M) ein endloser Mikrolinsenfaden bereitgestellt wird, der eine Oberseite und eine gegenüberliegende Unterseite aufweist, wobei die Oberseite zumindest in Teilbereichen mit Mikrolinsen versehen ist, M) an endless microlens thread is provided, which has an upper side and an opposite lower side, wherein the upper side is provided with microlenses at least in partial areas,
P) eine Papierbahn mit einem vorbestimmten Stegmuster erzeugt wird, welches Stegbereiche aufweist, in denen der Mikrolinsenfaden im Inneren der Papierbahn eingebettet ist, und das zwischen den Stegbereichen liegende Fensterbereiche aufweist, in denen der Mikrolinsenfaden an der Oberfläche der Papierbahn hervortritt, und E) der Mikrolinsenf aden in die Papierbahn eingebracht und dabei auf seiner Unterseite und in den Stegbereichen auch auf seiner Oberseite mit der Papierbahn verbunden wird, wobei die Papierbahn mit dem eingebrachten Mikrolinsenfaden das Sicherheitspapier bildet. P) a paper web having a predetermined web pattern is produced, which has land regions in which the microlens thread is embedded in the interior of the paper web, and which has window regions lying between the web regions, in which the microlens thread protrudes on the surface of the paper web, and E) of the Mikrolinsenf Aden introduced into the paper web and is connected on its underside and in the web areas also on its upper side with the paper web, wherein the paper web forms the safety paper with the introduced Mikrolinsenfaden.
In einer bevorzugten Verfahrensvariante ist vorgesehen, dass der Mikrolinsenfaden vor der Einbringung in die Papierbahn auf seiner Oberseite mit einer Klebstoffschicht in Gestalt des Stegmusters versehen wird, und der Mikrolinsenfaden in Schritt E) registriert in die Papierbahn eingebracht wird, so dass die mit Klebstoff beschichteten Bereiche des Mikrolinsenfadens mit den Stegbereichen der Papierbahn zusammenfallen. In a preferred variant of the method it is provided that the microlens thread is provided on its upper side with an adhesive layer in the form of the web pattern prior to introduction into the paper web and the microlens thread registered in step E) is introduced into the paper web so that the regions coated with adhesive of the microlens thread coincide with the web portions of the paper web.
Eine registrierte Einbringung des Mikrolinsenfadens kann insbesondere nach einem der in der Druckschrift WO 2004/050991 AI beschriebenen Verfahren erfolgen. Der Offenbarungsgehalt dieser Druckschrift wird insoweit in die vorliegende Anmeldung aufgenommen. A registered introduction of the microlens thread can be carried out in particular according to one of the methods described in the publication WO 2004/050991 Al. The disclosure of this document is included in the present application in this respect.
In manchen Gestaltungen kann der Mikrolinsenfaden ein Motiv mit einem Motivsprung enthalten. Wie in der Druckschrift WO 2008/145333 A2 näher beschrieben, wird bei der Herstellung eines Mikrolinsenfadens in der Regel zunächst eine endlose Sicherheitselement-Folie als Rollenmaterial hergestellt, wobei bei Einsatz herkömmlicher Herstellungsverfahren stets Bruchstellen, insbesondere Lücken oder ein Versatz im Erscheinungsbild der Sicherheitselemente auftreten. Diese Bruchstellen rühren daher, dass die Vorprodukte für die bei der Herstellung verwendeten Prägewerkzeuge im Allgemeinen als flache Platten hergestellt werden, die auf einen Druck- oder Prägezylinder aufgezogen werden. An den Nahtstellen stimmen die beiderseitig angrenzenden Bildmuster in aller Regel nicht überein und führen nach dem Druck oder der Prägung im Erscheinungsbild der fertigen Sicherheitsele- mente zu einem Motivsprung der genannten Art. Nach einer vorteilhaften Ausgestaltung der Erfindung wird ein Mikrolinsenfaden, der ein Motiv mit einem Motivsprung enthält, registriert in die Papierbahn eingebracht, so dass der Motivsprung in einem der Stegbereiche der Papierbahn zu liegen kommt. Der Motivsprung bleibt dem Betrachter dann verborgen. In some designs, the microlens thread may include a motif with a motif jump. As described in more detail in the publication WO 2008/145333 A2, in the production of a microlens thread initially an endless security element film is produced as a roll material, which always occur when using conventional manufacturing methods break points, especially gaps or a misalignment in the appearance of the security elements. These fractures are due to the fact that the precursors for the embossing tools used in the production in general are produced as flat plates, which are mounted on a printing or embossing cylinder. At the seams, the mutually adjacent image patterns usually do not match and lead after printing or embossing in the appearance of the finished Sicherheitsele- elements to a jump of the kind mentioned. According to an advantageous embodiment of the invention, a microlens thread, a motif with a Motive jump contains, registered introduced into the paper web, so that the motif jump comes to rest in one of the web areas of the paper web. The subject jump then remains hidden from the viewer.
Motivsprünge kommen unter Umständen auch mehrmals innerhalb eines Prägezylinders vor. Beispielsweise ergeben sich, falls die Muster mittels Rekombination aus kleinen Segmenten zusammengesetzt werden, Nähte mit Motivsprüngen. Generell entstehen Motivsprünge verfahrensbedingt sowohl im Raster der Mikrostrukturen, als auch im Raster der Mikrolinsen. Üblicherweise wird dabei versucht, die beiden Nähte bei der Herstellung in Überdeckung zu bringen, so dass für den Betrachter der Eindruck von nur einem Motivsprung entsteht. In einer Abwandlung des beschriebenen Verfahrens wird der Mikrolinsenfaden unmittelbar vor dem Einlaufen in die Papierbahn gezielt in den Bereichen seiner Oberseite mit einer Klebstoffschicht bedruckt, die bei der Blattbildung unterhalb von Stegbereichen der Papierbahn zu liegen kommen. Bei einer weiteren bevorzugten Verfahrensvariante ist vorgesehen, dass der Mikrolinsenfaden vor der Einbringung in die Papierbahn in einem Öffnungsbereich in Gestalt des Stegmusters mit einer Mehrzahl von Öffnungen versehen wird, und der Mikrolinsenfaden in Schritt E) registriert in die Papierbahn eingebracht wird, so dass die mit Öffnungen versehenen Bereiche des Mik- rolinsenfadens mit den Stegbereichen der Papierbahn zusammenfal- len. Under certain circumstances, subject jumps occur several times within an embossing cylinder. For example, if the patterns are composed by recombination of small segments, stitches with motif jumps result. In general, motive jumps occur due to the process both in the grid of the microstructures and in the grid of the microlenses. Usually, attempts are made to bring the two seams in the production in coverage, so that arises for the viewer the impression of only one jump in the subject. In a modification of the method described, the microlens thread is printed directly before entering the paper web targeted in the areas of its upper side with an adhesive layer, which come to lie in the sheet formation below land areas of the paper web. In a further preferred variant of the method it is provided that the microlens thread is provided with a plurality of openings in an opening region in the form of the web pattern before being introduced into the paper web, and the microlens filament in step E) is registered in the paper web, so that the apertured regions of the microlens filament coincide with the web regions of the paper web.
Auch bei dieser Variante kann der Mikrolinsenfaden ein Motiv mit einem Motivsprung enthalten und der Mikrolinsenfaden registriert eingebracht werden, so dass der Motivsprung in einem der Stegbereiche der Papierbahn zu liegen kommt und damit für den Betrachter verborgen ist. In this variant, too, the microlens thread can contain a motif with a motif jump and the microlens thread can be registered, so that the motif jump comes to rest in one of the web areas of the paper web and is therefore hidden from the viewer.
Nach einer Abwandlung des Verfahrens wird der Mikrolinsenfaden unmittelbar vor dem Einlaufen in die Papierbahn gezielt in den Bereichen seiner Oberseite mit Öffnungen versehen, die bei der Blattbildung unterhalb von Stegbereichen der Papierbahn zu liegen kommen. According to a modification of the method, the microlens thread is provided in the areas of its upper side with openings, which come to rest below the land areas of the paper web during sheet formation, immediately before entering the paper web.
Die Öffnungen werden mit Vorteil durch Stanzen oder Laserschneiden erzeugt. Werden die Öffnungen erst unmittelbar vor dem Einlaufen des Mik- rolinsenfadens in die Papierbahn erzeugt, so werden sie vorzugsweise durch Laserschneiden erzeugt. The openings are advantageously produced by punching or laser cutting. If the openings are produced in the paper web only immediately before the shrinkage of the microlens thread, they are preferably produced by laser cutting.
In allen Gestaltungen wird die Papierbahn zweckmäßig mit dem vorbestimmten Stegmuster in einer Papiermaschine gebildet und der endlose Mikrolinsenfaden läuft in die Papiermaschine ein. In all configurations, the paper web is expediently formed with the predetermined web pattern in a paper machine and the endless microlens thread runs into the paper machine.
Gemäß einer weiteren bevorzugten Verfahrensvariante ist vorgesehen, dass in Schritt M) ein Mikrolinsenfaden bereitgestellt wird, dessen Oberseite Teilbereiche mit Mikrolinsen und Mikrolinsen-freie Teilbereiche aufweist, wobei die Mikrolinsen-freien Teilbereiche kleiner als die Breite der Stegbereiche des Stegmusters in der Papierbahn sind, und wobei die Mikrolinsen-freien Teilbereiche vor der Einbringung in die Papierbahn mit Klebstoff beschichtet werden. Der Mikrolinsenfaden wird insbesondere unregistriert in die Papierbahn eingebracht, so dass in jedem Fensterbereich zumindest bereichs- weise Mikrolinsen zu sehen sind und stets ein Teil der Klebstoffbeschichteten Teilbereiche unterhalb von Stegbereichen der Papierbahn zu liegen kommen. According to a further preferred variant of the method, it is provided that in step M) a microlens thread is provided whose upper side has partial areas with microlenses and microlens-free partial areas, the microlens-free partial areas being smaller than the width of the bridge areas of the Web pattern are in the paper web, and wherein the microlens-free portions are coated prior to introduction into the paper web with adhesive. In particular, the microlens thread is introduced into the paper web in an unregistered manner so that microlenses are at least partially visible in each window region and always a portion of the adhesive-coated subregions come to rest beneath web regions of the paper web.
Gemäß einer weiteren bevorzugten Verfahrensvariante ist vorgesehen, dass in Schritt M) ein Mikrolinsenfaden bereitgestellt wird, der einerseits Teilbereiche mit Mikrolinsen aufweist, welche Teilbereiche vor der Einbringung in die Papierbahn mit Klebstoff beschichtet werden und welche kleiner als die Breite der Stegbereiche des Stegmusters in der Papierbahn sind, und andererseits Teilbereiche mit Mikrolinsen aufweist, die vor der Einbringung in die Papierbahn nicht mit Klebstoff beschichtet werden. Der Mikrolinsenfaden wird insbesondere unregistriert in die Papierbahn eingebracht, so dass in jedem Fensterbereich zumindest bereichsweise Mikrolinsen, die keine Klebstoff-Beschichtung aufweisen, zu sehen sind und stets ein Teil der Klebstoff-beschichteten Teilbereiche unterhalb von Stegbereichen der Papierbahn zu liegen kommen. According to a further preferred variant of the method, it is provided that in step M) a microlens thread is provided which on the one hand has partial regions with microlenses, which partial regions are coated with adhesive before being introduced into the paper web and which are smaller than the width of the web regions of the web pattern in the paper web on the other hand, have partial areas with microlenses which are not coated with adhesive before being introduced into the paper web. The microlens thread is introduced in particular unregistered in the paper web, so that in each window area at least partially microlenses that have no adhesive coating, can be seen and always come to lie part of the adhesive-coated portions below web portions of the paper web.
In allen beschrieben Verfahrensvarianten wird der Mikrolinsenfaden mit Vorteil vor der Einbringung in die Papierbahn auf seiner Unterseite vollflächig mit einer Klebstoff schicht versehen. In all described variants of the method, the microlens thread is advantageously provided over its entire surface with an adhesive layer before being introduced into the paper web on its underside.
Die Erfindung enthält auch einen Mikrolinsenfaden zum Einbringen in eine Papierbahn, insbesondere mit dem eben beschriebenen Verfahren. Der Mikrolinsenfaden enthält eine Oberseite und eine gegenüberliegende Unterseite, wobei die Oberseite Teilbereiche mit Mikrolinsen aufweist und Mikrolinsen- freie Teilbereiche aufweist, die mit Klebstoff beschichtet sind. The invention also includes a microlens thread for insertion into a paper web, in particular with the method just described. The microlens thread includes a top and an opposite bottom, the upper side having partial areas with microlenses and microlens-free partial areas which are coated with adhesive.
Die Teilbereiche mit Mikrolinsen und die Mikrolinsen-freien Teilbereiche bilden vorteilhaft auf der Oberseite des Fadens alternierende Streifen, die jeweils vollständig die Breite des Mikrolinsenfadens einnehmen und die in Längsrichtung des Mikrolinsenfadens jeweils eine Ausdehnung zwischen 1 mm und 30 mm, vorzugsweise zwischen 3 mm und 12 mm aufweisen. Die Teilbereiche mit Mikrolinsen und die Mikrolinsen-freien Teilbereiche können üblicherweise in Form von Rechtecken vorliegen. Es wäre aber auch möglich, dass die Teilbereiche mit Mikrolinsen und die Mikrolinsen-freien Teilbereiche in Form von Diagonalen vorliegen. Es lassen sich insbesondere bei breiteren Fäden diagonale Papierstege fertigen. The microlens sections and the microlens-free sections advantageously form alternating strips on the upper side of the thread, each of which completely occupies the width of the microlens thread and in each case has an extension of between 1 mm and 30 mm, preferably between 3 mm and 12, in the longitudinal direction of the microlens thread mm have. The microlens sections and the microlens-free sections may usually be in the form of rectangles. However, it would also be possible for the partial areas with microlenses and the microlens-free partial areas to be present in the form of diagonals. It can be made especially for wider threads diagonal paper webs.
Die Unterseite des Mikrolinsenfadens ist vorzugsweise vollflächig mit Klebstoff beschichtet. The underside of the microlens thread is preferably coated over the entire surface with adhesive.
Weitere Ausführungsbeispiele sowie Vorteile der Erfindung werden nach- folgend anhand der Figuren erläutert, bei deren Darstellung auf eine maß- stabs- und proportionsgetreue Wiedergabe verzichtet wurde, um die Anschaulichkeit zu erhöhen. 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.
Es zeigen: Show it:
Fig. 1 eine schematische Darstellung einer erfindungsgemäß hergestellten Banknote mit einem eingebetteten Mikrolinsenfaden, schematisch den Schichtaufbau eines Mikrolinsenf adens vor der Einbettung in das Sicherheitspapier, einen Querschnitt eines Sicherheitspapiers mit einem eingebetteten Mikrolinsenfaden nach Fig. 2, eine Aufsicht auf den Mikrolinsenfaden der Fig. 2, eine Aufsicht auf einen weiteren Mikrolinsenfaden vor der Einbettung in ein Sicherheitspapier, einen Querschnitt des Mikrolinsenfadens der Fig. 5, einen Querschnitt eines Sicherheitspapiers mit einem eingebetteten Mikrolinsenfaden nach den Figuren 5 und 6, einen Querschnitt des erfindungsgemäßen Mikrolinsenfadens; und einen Querschnitt eines Sicherheitspapiers mit einem eingebetteten Mikrolinsenfaden nach Fig. 8. 1 is a schematic representation of a banknote according to the invention with an embedded microlens thread, 2 shows a plan view of the microlens thread of FIG. 2, a plan view of another microlens thread before embedding in a security paper, FIG 5 shows a cross-section of the microlens thread of FIG. 5, a cross section of a security paper with an embedded microlens thread according to FIGS. 5 and 6, a cross section of the microlens thread according to the invention; and a cross section of a security paper with an embedded microlens thread according to FIG. 8.
Die Erfindung wird nun am Beispiel einer Banknote erläutert. Figur 1 zeigt dazu eine schematische Darstellung einer erfindungsgemäß hergestellten Banknote 10 mit einem mikrooptischen Fenstersicherheitsfaden 12, der nachfolgend auch kurz als Mikrolinsenfaden bezeichnet wird. Der Mikrolinsenfaden 12 tritt in Fensterbereichen 14 an der Oberfläche der Banknote 10 hervor, während er in den dazwischen liegenden Stegbereichen 16 im Inneren der Banknote 10 eingebettet ist. Bei einem ersten Ausführungsbeispiel der Erfindung wird für die Herstellung eines Sicherheitspapiers der in den Figuren 2 und 4 illustrierte Mikrolinsenfaden 12 verwendet. Figur 3 zeigt einen Querschnitt des Sicher heitspa- piers 50 mit dem bereits eingebetteten Mikrolinsenfaden 12. Bei der Herstellung von Sicherheitspapier läuft der Mikrolinsenfaden dabei beispielsweise in endloser Form in eine Papiermaschine ein und wird dort in eine sich auf einem Rundsieb bildende Papierbahn eingebettet. Die Papierbahn zusammen mit dem eingebetteten Mikrolinsenfaden wird in dieser Beschreibung als Sicherheitspapier bezeichnet. Aus einem solchen Sicherheitspapier entsteht nach weiteren Bearbeitungsschritten und Vereinzelung der Nutzen einer Papierbahn oder eines Papierbogens eine Banknote 10 wie in Fig. 1 gezeigt. Figur 2 zeigt Schema tisch den Schichtaufbau des Mikrolinsenfadens 12 vor der Einbettung in das Sicherheitspapier, wobei nur die für die Erläuterung des Funktionsprinzips erforderlichen Teile des Schichtaufbaus dargestellt sind. Figur 4 zeigt eine Aufsicht auf den Mikrolinsenfaden 12 der Fig. 2. Der Mikrolinsenfaden 12 enthält einen Träger 20 in Form einer transparenten Kunststoff folie, beispielsweise einer etwa 20 μπι dicken PET-Folie. Die Oberseite 30 des Mikrolinsenfadens 12 weist eine rasterförmige Anordnung von Mikrolinsen 22 auf, die auf der Oberfläche der Trägerfolie ein Gitter mit einer vorgewählten Symmetrie bilden. Die sphärisch oder asphärisch ausges- talteten Mikrolinsen 22 weisen vorzugsweise einen Durchmesser zwischen 5 μπι und 50 μιη und insbesondere einen Durchmesser zwischen lediglich 10 μη und 35 μιη auf und sind daher mit bloßem Auge nicht zu erkennen. Es versteht sich, dass bei anderen Gestaltungen auch größere oder kleinere Abmessungen infrage kommen. Auch der Einsatz von Zylinderlinsen ist in gleicher Weise möglich. The invention will now be explained using the example of a banknote. FIG. 1 shows a schematic representation of a bank note 10 produced according to the invention with a micro-optical window security thread 12, which is also referred to below as a microlens thread. The microlens thread 12 emerges in window areas 14 on the surface of the banknote 10, while it is embedded in the interposed web areas 16 in the interior of the banknote 10. In a first exemplary embodiment of the invention, the microlens thread 12 illustrated in FIGS. 2 and 4 is used for the production of a security paper. FIG. 3 shows a cross-section of the security paper 50 with the microlens thread 12 already embedded. In the production of security paper, the microlens thread runs, for example, in an endless form into a paper machine and is embedded there in a paper web forming on a round screen. The paper web together with the embedded microlens thread is referred to in this specification as security paper. From such a security paper arises after further processing steps and separation of the benefits of a paper web or a sheet of paper, a banknote 10 as shown in Fig. 1. FIG. 2 shows a schematic of the layer structure of the microlens thread 12 prior to embedding in the security paper, wherein only the parts of the layer structure required for explaining the functional principle are shown. FIG. 4 shows a plan view of the microlens thread 12 of FIG. 2. The microlens thread 12 contains a carrier 20 in the form of a transparent plastic film, for example a PET film about 20 .mu.m thick. The upper side 30 of the microlens thread 12 has a grid-like arrangement of microlenses 22 which form a grid with a preselected symmetry on the surface of the carrier foil. The spherically or aspherically ausgestaltet microlenses 22 preferably have a diameter between 5 μπι and 50 μιη and in particular a diameter between only 10 μη and 35 μιη and are therefore not visible to the naked eye. It is understood that in other designs also larger or smaller Dimensions come into question. The use of cylindrical lenses is possible in the same way.
Auf der Unterseite 32 des Mikrolinsenfadens 12 ist eine Motivschicht 26 an- geordnet, die eine ebenfalls rasterförmige Anordnung von Mikromotivele- menten 28 enthält. Auch die Anordnung der Mikromotivelemente 28 bildet ein Gitter mit einer vorgewählten Symmetrie, wobei durch die Abstimmung des Gitters der Mikrolinsen 22 und der Anordnung der Mikromotivelemente 28 ein gewünschter Vergrößerungseffekt, charakteristische Bewegungseffek- te und/ oder Kippeffekte erzeugt werden. Die Mikromotivelemente sind mit bloßem Auge nicht zu erkennen. An dieser Stelle wird zusätzlich auf die WO 2009/000528 AI verwiesen, worin ausgeführt ist, dass die Mikrostrukturen auch aus Bildfragmenten bestehen können, die nicht wiederholend angeordnet sind. Der Mikrolinsenfaden 12 enthält typischerweise weitere Schichten 24, wie etwa Schutz-, Abdeck- oder weitere Funktionsschichten, die für die vorliegenden Erfindung jedoch nicht wesentlich sind und daher nicht näher beschrieben werden. On the underside 32 of the microlens thread 12, a motif layer 26 is arranged, which contains a likewise grid-shaped arrangement of micromotiv elements 28. The arrangement of the micromotif elements 28 also forms a lattice with a preselected symmetry, wherein the tuning of the lattice of the microlenses 22 and the arrangement of the micromotif elements 28 produces a desired magnification effect, characteristic movement effects and / or tilting effects. The micromotif elements are invisible to the naked eye. Reference is additionally made at this point to WO 2009/000528 A1, in which it is stated that the microstructures can also consist of image fragments which are not arranged repetitively. The microlens thread 12 typically includes other layers 24, such as protective, masking or other functional layers, which are not essential to the present invention and therefore will not be described further.
Bedingt durch die Herstellung mit Prägezylindern wird das vom Betrachter wahrgenommene Motiv üblicherweise einen Motivsprung aufweisen, wie etwa in der Druckschrift WO 2008/145333 A2 genauer beschrieben. Due to the production with embossing cylinders, the motif perceived by the viewer usually has a motif jump, as described in more detail, for example, in document WO 2008/145333 A2.
Zur Herstellung eines Sicherheitspapiers wird nun auf dem Rundsieb einer Papiermaschine eine Papier bahn 50 mit einem vor bestimmten Stegmuster 18 (Fig. 1) erzeugt. Das Stegmuster 18 weist Stegbereiche 16 auf, in denen der Mikrolinsenfaden 12 später im Inneren der fertigen Papier bahn 50 eingebettet ist. Zwischen den Stegbereichen 16 liegen Fenster bereiche 14, in denen der Mikrolinsenfaden 12 an der Oberfläche der fertigen Papierbahn 50 hervortritt. Wie in den Figuren 2 und 4 schematisch dargestellt, wird der Mikrolinsenfa- den 12 vor der Einbringung in die Papierbahn 50 auf seiner Oberseite 30 mit einer Klebstoff Schicht 40 in Gestalt des Stegmusters 18 versehen, so dass die Klebstoffschicht 40 ein Klebstoffmuster 48 bildet, dessen Abfolge von unbeschichteten Bereichen 44 und beschichteten Bereichen 46 der Abfolge der Fensterbereiche 14 und Stegbereiche 16 des Stegmusters 18 entspricht. Die Unterseite 32 des Mikrolinsenfadens 12 wird mit einer vollflächigen Klebstoffschicht 42 versehen. To produce a security paper, a paper web 50 is now produced on the round screen of a paper machine with a predetermined web pattern 18 (FIG. The web pattern 18 has land areas 16 in which the microlens thread 12 is embedded later in the interior of the finished paper web 50. Between the web portions 16 are window areas 14 in which the microlens thread 12 emerges on the surface of the finished paper web 50. As shown schematically in FIGS. 2 and 4, the microlens fiber 12 is provided on its upper side 30 with an adhesive layer 40 in the form of the web pattern 18 before being introduced into the paper web 50, so that the adhesive layer 40 forms an adhesive pattern 48 whose Sequence of uncoated areas 44 and coated areas 46 of the sequence of window areas 14 and web portions 16 of the web pattern 18 corresponds. The underside 32 of the microlens thread 12 is provided with a full-surface adhesive layer 42.
Dieser so mit Klebstoff 40, 42 beschichtete Mikrolinsenfaden 12 wird nun registriert in die Papierbahn 50 eingebracht, so dass die mit Klebstoff beschichteten Bereiche 46 des Mikrolinsenfadens mit den Stegbereichen 16 der Papierbahn 50 zusammenfallen, wie in Fig. 3 gezeigt. This microlens thread 12 thus coated with adhesive 40, 42 is then registered in the paper web 50, so that the adhesive-coated regions 46 of the microlens thread coincide with the web regions 16 of the paper web 50, as shown in FIG.
Eine solche registrierte Einbringung kann insbesondere nach einem der in der Druckschrift WO 2004/050991 AI beschriebenen Verfahren erfolgen. Beispielsweise kann der Mikrolinsenfaden 12 mittels einer Spule unter Vorspannung in die Papierbahn eingebracht werden. Ein erster Sensor erfasst die Position der beschichteten Bereiche 46 kurz vor der Einbringung in die Papierbahn, ein zweiter Sensor die Position der in der Papierbahn gebildeten Stege 16 unmittelbar nach der Blattbildung. Die von den beiden Sensoren erfassten Positionen werden ausgewertet und zur Steuerung der Größe der Vorspannung verwendet. Bei Erhöhung der Vorspannung wird der Mikrolinsenfaden 12 stärker gedehnt, bei Erniedrigung der Vorspannung wird die Dehnung verringert. Der Mikrolinsenfaden 12 kann auf diese Weise mit seinen beschichteten und unbeschichteten Bereichen 44, 46 registergenau auf die Fenster- und Stegbereiche 14, 16 ausgerichtet werden. Vorzugsweise wird bei der registrierten Fadeneinbettung so verfahren, dass der Faden eine Registermarke trägt, die von einem Detektionssystem besonders gut erkannt wird. Die Fadeneinbettung wird dann mittels der Zugspannung am Faden so gesteuert, dass die Registermarke des Fadens in fes- tem örtlichen Bezug zur Registermarke des Papiers, üblicherweise einer Wasserzeichenmarke, steht. Die Bereiche, in denen der Faden an der Oberseite Klebstoff aufweist stehen dabei dann in festem, bekannten örtlichen Bezug zur Registermarke des Fadens. In analoger Weise befinden sich die Stegbereiche im Papier in fester örtlicher Beziehung zur Registermarke im Papier. Such a registered introduction can be carried out in particular according to one of the methods described in the document WO 2004/050991 Al. For example, the microlens thread 12 can be introduced by means of a coil under pretension in the paper web. A first sensor detects the position of the coated regions 46 shortly before being introduced into the paper web, a second sensor detects the position of the webs 16 formed in the paper web immediately after sheet formation. The positions detected by the two sensors are evaluated and used to control the magnitude of the bias voltage. When the bias voltage is increased, the microlens thread 12 is stretched more, and when the preload is lowered, the elongation is reduced. The microlens thread 12 can be aligned in this manner with its coated and uncoated areas 44, 46 in register on the window and web areas 14, 16. Preferably, in the case of registered thread embedding, the method is such that the thread carries a register mark, which is recognized particularly well by a detection system. The thread embedding is then controlled by means of the tension on the thread so that the register mark of the thread is in fixed local reference to the register mark of the paper, usually a watermark. The areas in which the thread has adhesive on the top are then in a fixed, known local reference to the register mark of the thread. In an analogous manner, the land areas in the paper are in fixed local relation to the register mark in the paper.
Durch diese Vorgehensweise wird sichergestellt, dass die Stegbereiche 16 der Papierbahn 50 mit dem Mikrolinsenfaden 12 verklebt werden, so dass eine sichere Einbettung des Mikrolinsenfadens 12 ohne Faltenbildung und ohne Abheben oder Ausreißen der Papierstege bei der Herstellung gewährleistet wird. Ebenso wird Stabilität der Papierstege gegen Umlaufbeanspruchungen signifikant verbessert. Gleichzeitig bleiben die Mikrolinsen 22 der in den Fensterbereichen 14 sichtbaren unbeschichteten Bereiche 44 frei von Klebstoff, so dass die optischen Eigenschaften der Mikrolinsen 22 nicht beeinträchtigt werden. Der Mikrolinsenfaden 12 zeigt daher nach seiner Einbettung in die Papierbahn 50 in den Fensterbereichen 14 das gewünschte klare visuelle Erscheinungsbild. This procedure ensures that the web areas 16 of the paper web 50 are glued to the microlens thread 12 so that secure embedding of the microlens thread 12 without wrinkling and without lifting or tearing the paper webs during production is ensured. Likewise, the stability of the paper webs against circulation stresses is significantly improved. At the same time, the microlenses 22 of the uncoated regions 44 visible in the window regions 14 remain free of adhesive, so that the optical properties of the microlenses 22 are not impaired. The microlens thread 12 therefore exhibits the desired clear visual appearance after being embedded in the paper web 50 in the window regions 14.
Die unbeschichteten Bereiche 44 und die beschichteten Bereichen 46 weisen in vorteilhaften Ausgestaltungen dieselbe Größe auf wie die Fensterbereiche 14 bzw. die Stegbereiche 16. In machen Ausgestaltungen ist auch vorgesehen, dass die beschichteten Bereiche 46 kleiner, beispielsweise um nicht mehr als 10% oder um nicht mehr als 50 % kleiner sind als die Stegbereiche 16. Um wie viel der kleberbeschichtete Teil verglichen mit den Papierstegen des Fadens kürzer sein sollte, hängt auch stark mit der Registertoleranz bei der registrierten Fadeneinbettung zusammen. Bei z.B. ± 1 mm Registertoleranz in der registrierten Fadeneinbringung sollten die kleberfreien Bereiche des Fadens 2 mm kürzer als die Papierstege sein. Selbst wenn jeweils nur ein Teil des Mikrolinsenfadens 12 mit den Stegbereichen 16 verklebt ist, ergibt sich gegenüber dem Stand der Technik eine deutlich verbesserte Einbettung. The uncoated regions 44 and the coated regions 46 have, in advantageous embodiments, the same size as the window regions 14 or the land regions 16. In some embodiments, it is also provided that the coated regions 46 are smaller, for example by not more than 10% or not more than 50% smaller than the land areas 16. By how much the glue-coated part compared to the paper webs thread length is also very much related to the register tolerance of registered thread embedding. For example, if the registration allowance is ± 1 mm registered thread insertion, the glue-free areas of the thread should be 2 mm shorter than the paper webs. Even if only a part of the microlens thread 12 is glued to the web areas 16, a significantly improved embedding results compared with the prior art.
Auch Gestaltungen, bei denen die unbeschichteten Bereiche 44 etwas kleiner sind als die Fensterbereiche 14 kommen in Betracht. Allerdings ist die fokus- sierende Wirkung klebstoffbeaufschlagter Mikrolinsen 22 in den Fensterbereichen 14 vermindert oder aufgehoben, so dass die unbeschichteten Bereiche 44 bevorzugt um nicht mehr als 10%, besonders bevorzugt um nicht mehr als 5% kleiner sind als die Fensterbereiche 14. Ein weiterer Vorteil der registrierten Einbringung des Mikrolinsenfadens 12 besteht darin, dass eventuelle Motivsprünge 34 im Motivbild unter einem Papiersteg 16 des Sicherheitspapiers 50 versteckt werden können, wie in Fig. 3 gezeigt. Dadurch wird die Gleichmäßigkeit des visuellen Erscheinungsbilds des Mikrolinsenfadens 12 weiter erhöht. Even configurations in which the uncoated regions 44 are slightly smaller than the window regions 14 come into consideration. However, the focusing effect of adhesive-loaded microlenses 22 in the window regions 14 is reduced or eliminated, so that the uncoated regions 44 are preferably smaller by no more than 10%, particularly preferably not more than 5%, than the window regions 14. Another advantage the registered introduction of the microlens thread 12 is that any potential jumps 34 in the motif image can be hidden under a paper web 16 of the security paper 50, as shown in Fig. 3. Thereby, the uniformity of the visual appearance of the microlens thread 12 is further increased.
Bei einer Abwandlung des beschriebenen Verfahrensablaufs wird der Mikro- linsenfaden 12 nicht registriert in die Papierbahn 50 eingebracht, sondern wird unmittelbar vor dem Einlaufen in die Papiermaschine so mit einem Klebstoffmuster 48 bedruckt, dass die beschichteten Bereiche 46 in die ver- tieften Abschnitte des Rundsiebs, in denen sich die Papierstege 16 ausbilden, zu liegen kommen. Dazu kann beispielsweise ein Sensor die Position der bei der Blattbildung in der Papierbahn gebildeten Stege 16 erfassen und die er- f asste Position kann zur Steuerung der Druckpositionen für das Klebstoffmuster 48 verwendet werden. Auch auf diese Weise können die unbeschich- teten und beschichteten Bereiche 44, 46 registergenau auf die Fenster- und Stegbereiche 14, 16 ausgerichtet werden. In a modification of the method described, the microlens filament 12 is introduced into the paper web 50 in a registered manner, but is printed with an adhesive pattern 48 just before entering the papermachine so that the coated regions 46 penetrate into the recessed portions of the round screen. in which the paper webs 16 form, come to rest. For this purpose, for example, a sensor can detect the position of the webs 16 formed during sheet formation in the paper web, and the detected position can be used to control the printing positions for the adhesive pattern 48. In this way too, the uncoated teten and coated areas 44, 46 register exactly on the window and web areas 14, 16 are aligned.
Eine weitere Erfindungsvariante wird nun anhand der Figuren 5 bis 7 erläu- tert. Dabei zeigen die Figuren 5 und 6 eine Aufsicht bzw. einen Querschnitt des Mikrolinsenfadens 60 vor der Einbettung in das Sicherheitspapier und Fig. 7 zeigt einen Querschnitt des Sicherheitspapiers 50 mit dem eingebetteten Mikrolinsenfaden 60. Bei der Variante der Figuren 5 bis 7 wird der Mikrolinsenfaden 60 auf seiner Oberseite 30 nicht mit Klebstoff beschichtet, sondern er wird vor der Einbringung in die Papierbahn 50 mit einem Öffnungsmuster 68 in Gestalt des Stegmusters 18 versehen. Das Öffnungsmuster 68 besteht aus einer Abfolge von Bereichen 66 mit Öffnungen 62 und Bereichen 64 ohne Öffnungen, die der Abfolge der Stegbereiche 16 und Fensterbereiche 14 des Stegmusters 18 entspricht. Die Unterseite 32 des Mikrolinsenfadens 60 wird vorzugsweise mit einer vollflächigen Klebstoffschicht 42 versehen. A further variant of the invention will now be explained with reference to FIGS. 5 to 7. 5 and 6 show a plan view and a cross section of the microlens thread 60 prior to embedding in the security paper, and FIG. 7 shows a cross section of the security paper 50 with the embedded microlens thread 60. In the variant of FIGS. 5 to 7, the microlens thread 60 becomes on its upper side 30 is not coated with adhesive, but it is provided prior to introduction into the paper web 50 with an opening pattern 68 in the form of the web pattern 18. The opening pattern 68 consists of a sequence of regions 66 with openings 62 and regions 64 without openings, which corresponds to the sequence of the land regions 16 and window regions 14 of the web pattern 18. The underside 32 of the microlens thread 60 is preferably provided with a full-surface adhesive layer 42.
Der Mikrolinsenfaden 60 wird nun registriert in die Papierbahn 50 einge- bracht, so dass die mit Öffnungen versehenen Bereiche 66 des Mikrolinsenfadens 60 mit den Stegbereichen 16 der Papierbahn 50 zusammenfallen, wie grundsätzlich bereits im Zusammenhang mit den Figuren 2 bis 4 beschrieben. Der erste Sensor erfasst in diesem Fall die Position der Öffnungen 62 kurz vor der Einbringung des Mikrolinsenfadens 12 in die Papierbahn. Der Mikrolinsenfaden 60 kann auf diese Weise mit seinem Öffnungsmuster 68 registergenau auf die Fenster- und Stegbereiche 14, 16 ausgerichtet werden. The microlens thread 60 is registered in the paper web 50, so that the apertured areas 66 of the microlens thread 60 coincide with the web areas 16 of the paper web 50, as already described in principle in connection with FIGS. 2 to 4. The first sensor in this case detects the position of the openings 62 just before the introduction of the microlens thread 12 into the paper web. In this way, the microlens thread 60 can be aligned in register with the window and web regions 14, 16 with its opening pattern 68.
Bei dieser Erfindungsvariante wird durch das Vorsehen der Öffnungen 62 erreicht, dass bei der Papierbildung unter den Stegbereichen 16 Papierfasern oder andere Bestandteile des Substrats 50 durch die Öffnungen 62 dringen können, um eine Verbindung zwischen den Stegbereichen 16 und dem Substratmaterial 52 unter dem Mikrolinsenfaden 60 herzustellen (Fig. 7). Auch dadurch wird eine innige Verbindung von Papierbahn 50 und Mikrolinsen- faden 60 und damit eine sichere Einbettung ohne Faltenbildung erreicht. Da die Oberseite 30 des Mikrolinsenfadens 60 klebstofffrei bleibt, werden die optischen Eigenschaften der Mikrolinsen 22 nicht beeinträchtigt. In this variant of the invention is achieved by the provision of the openings 62 that in the formation of paper under the web portions 16 paper fibers or other constituents of the substrate 50 may penetrate through the openings 62 to establish communication between the land areas 16 and the substrate material 52 under the microlens filament 60 (FIG. 7). This also results in an intimate connection of paper web 50 and microlens thread 60 and thus secure embedding without wrinkling being achieved. Since the top 30 of the microlens thread 60 remains adhesive-free, the optical properties of the microlenses 22 are not compromised.
Die Öffnungen 62 können beispielsweise gestanzt oder durch Laserschnei- den erzeugt werden. Jeder Bereich 66 kann eine oder auch mehrere Öffnungen 62 enthalten. Zur Illustration zeigen die Figuren 6 und 7 eine Gestaltung mit jeweils nur einer Öffnung 62 pro Bereich 66, während Fig. 5 eine Gestaltung mit drei Öffnungen 62 pro Bereich 66 illustriert. Bei einer Abwandlung des beschriebenen Verfahrensablaufs wird der Mikrolinsenfaden 60 nicht registriert in die Papierbahn 50 eingebracht, sondern er wird erst unmittelbar vor dem Einlaufen in die Papiermaschine durch Laserbeaufschlagung so mit dem Öffnungsmuster 68 versehen, dass die Bereiche 66 mit Öffnungen 62 in die vertieften Abschnitte des Rundsiebs, in denen sich die Papierstege 16 ausbilden, zu liegen kommen. Dazu kann beispielsweise ein Sensor die Position der in der Papierbahn gebildeten Stege 16 erfassen und die erfasste Position kann zu Steuerung des Laserstrahls verwendet werden. Auch auf diese Weise kann das Öffnungsmuster 68 registergenau auf die Fenster- und Stegbereiche 14, 16 ausgerichtet werden. The openings 62 may for example be punched or produced by laser cutting. Each region 66 may include one or more apertures 62. As an illustration, FIGS. 6 and 7 show a design with only one opening 62 per area 66, while FIG. 5 illustrates a design with three openings 62 per area 66. In a modification of the method described process, the microlens thread 60 is not registered registered in the paper web 50, but it is only immediately before entering the paper machine by laser exposure so provided with the opening pattern 68 that the areas 66 with openings 62 in the recessed portions of Rundsiebs, in which the paper webs 16 form, come to rest. For this purpose, for example, a sensor can detect the position of the webs 16 formed in the paper web and the detected position can be used to control the laser beam. Also in this way, the opening pattern 68 register exactly on the window and web portions 14, 16 are aligned.
Bei einer weiteren Erfindungsvariante, die in den Figuren 8 und 9 illustriert ist, wird ein Mikrolinsenfaden 70 eingesetzt, der auf seiner Oberseite 30 eine Abfolge von Teilbereichen 74 mit Mikrolinsen 22 und von Mikrolinsen-freien Teilbereichen 76 aufweist. Die Motivschicht und eventuelle weiteren Schich- ten des Mikrolinsenfadens 70 sind in den Figuren 8 und 9 der Übersichtlichkeit halber nicht gezeigt. Die Mikrolinsen-freien Teilbereiche 76 der Oberseite 30 sind mit Klebstoff 40 beschichtet und auch die Unterseite des Mikrolinsenfadens 70 ist vollflächig mit Klebstoff 42 beschichtet. In a further variant of the invention, which is illustrated in FIGS. 8 and 9, a microlens thread 70 is used which has on its upper side 30 a sequence of partial regions 74 with microlenses 22 and microlens-free partial regions 76. The motif layer and any further layers th of the microlens thread 70 are not shown in FIGS. 8 and 9 for the sake of clarity. The microlens-free portions 76 of the top 30 are coated with adhesive 40 and the underside of the microlens thread 70 is coated over its entire surface with adhesive 42.
Die mit Klebstoff beschichteten, Mikrolinsen-freien Teilbereiche 76 sind dabei kleiner als die Breite der Fensterbereiche 14 des Stegmusters 18 ausgebildet. Dadurch ist sichergestellt, dass bei der unregistrierten Einbringung des Mikrolinsenfadens 70 in ein Sicherheitspapier 50 in jedem Fensterbereich 14 zumindest bereichsweise Mikrolinsen 22 zu sehen sind (Fig. 9). The adhesive-coated, microlens-free subregions 76 are smaller than the width of the window regions 14 of the web pattern 18. This ensures that microlenses 22 can be seen at least in certain regions during the unregistered introduction of the microlens thread 70 into a security paper 50 in each window region 14 (FIG. 9).
Auf diese Weise wird einerseits ein visuell attraktives Erscheinungsbild erhalten, andererseits kann auch ohne eine registrierte Einbringung des Mikrolinsenfadens 70 eine gegenüber dem Stand der Technik verbesserte Einbet rung erreicht werden, da stets ein Teil der Klebstoff -beschichteten Teilbereiche 76 unterhalb von Stegbereichen 16 der Papierbahn zu liegen kommen wird, wie in Fig. 9 illustriert. In this way, on the one hand, a visually attractive appearance is obtained, on the other hand can be achieved without a registered introduction of the microlens thread 70 over the prior art improved Einbet tion, as always a portion of the adhesive-coated portions 76 below web portions 16 of the paper web to will come to lie, as illustrated in Fig. 9.
Gemäß einer Abwandlung der oben genannten, in den Figuren 8 und 9 illustrierten Erfindungsvariante können die mit Klebstoff beschichteten Bereiche durchaus auch Mikrolinsen aufweisen. Diese würden durch die Kleb- stoffbeschichrung zwar optisch unwirksam, erlauben aber eine einheitliche Ausgestaltung des Fadens mit Mikrolinsen. According to a modification of the abovementioned variant of the invention illustrated in FIGS. 8 and 9, the areas coated with adhesive may well also have microlenses. Although these would be optically ineffective due to the adhesive coating, they permit a uniform configuration of the thread with microlenses.
Gemäß einer weiteren Abwandlung der oben genannten, in den Figuren 8 und 9 illustrierten Erfindungsvariante bietet sich insbesondere bei breiteren Fäden an, die mikrolinsenfreien Bereiche diagonal oder streifenförmig längs des Fadens anzuordnen und damit gegebenenfalls über die ganze Länge des Fadens Bereiche bereitzustellen, die mit Kleber beschichtet werden können. Der in der vorliegenden Erfindung zur Anwendung kommende Klebstoff bzw. Kleber kann z.B. ein Heißsiegellack sein. Der Klebstoff kann darüber hinaus Sicherheitsmerkmale aufweisen, z.B. Farbstoffe bzw. Farbpigmente sowie Lumineszenzstoffe. According to a further modification of the abovementioned variant of the invention illustrated in FIGS. 8 and 9, in particular in the case of broader threads it is appropriate to arrange the microlens-free regions diagonally or in strips along the thread and thus optionally to provide areas over the entire length of the thread which coat with adhesive can be. The adhesive or adhesive used in the present invention may be, for example, a heat sealing lacquer. The adhesive may moreover have security features, for example dyes or color pigments and luminescent substances.
Bezu gszeichenliste Tag list
10 Banknote  10 banknote
12 Mikrolinsenfaden  12 microlens thread
14 Fensterbereiche  14 window areas
16 Stegbereiche  16 land areas
18 Stegmuster  18 bridge patterns
20 Träger  20 carriers
22 Mikrolinsen  22 microlenses
24 weitere Schichten  24 more layers
26 Motivschicht  26 motif layer
28 Mikromotivelemente  28 micromotif elements
30 Oberseite  30 top
32 Unterseite  32 bottom
34 Motivsprung  34 motif jump
40 Klebstoffschicht Oberseite  40 adhesive layer top side
42 Klebstoffschicht Unterseite  42 adhesive layer underside
44 unbeschichtete Bereiche  44 uncoated areas
46 beschichtete Bereiche  46 coated areas
48 Klebstoffmuster  48 adhesive patterns
50 Papierbahn  50 paper web
52 Substratmaterial  52 substrate material
60 Mikrolinsenfaden 62 Öffnungen 60 microlens thread 62 openings
64 Bereiche ohne Öffnungen 64 areas without openings
66 Bereiche mit Öffnungen66 areas with openings
68 Öffnungsmuster 68 opening pattern
5 70 Mikrolinsenfaden  5 70 microlens thread
74 Teilbereiche mit Mikrolinsen 74 partial areas with microlenses
76 Mikrolinsen-freie Teilbereiche 76 microlens-free sections

Claims

P a t e n t a n s p r ü c h e P a n t a n s p r e c h e
Verfahren zur Herstellung eines Sicherheitspapiers, bei dem ein endloser Mikrolinsenfaden bereitgestellt wird, der eine Oberseite und eine gegenüberliegende Unterseite aufweist, wobei die Oberseite zumindest in Teilbereichen mit Mikrolinsen versehen ist, eine Papierbahn mit einem vorbestimmten Stegmuster erzeugt wird, welches Stegbereiche aufweist, in denen der Mikrolinsenfaden im Inneren der Papierbahn eingebettet ist, und das zwischen den Stegbereichen liegende Fensterbereiche aufweist, in denen der Mikrolinsenfaden an der Oberfläche der Papierbahn hervortritt, und der Mikrolinsenfaden in die Papierbahn eingebracht und dabei auf seiner Unterseite und in den Stegbereichen auch auf seiner Oberseite mit der Papierbahn verbunden wird, wobei die Papierbahn mit dem eingebrachten Mikrolinsenfaden das Sicherheitspapier bildet. A method for producing a security paper in which an endless microlens thread is provided which has a top side and an opposite bottom side, the top side being provided with microlenses at least in partial areas, a paper web having a predetermined web pattern is produced, which has web areas in which the Microlens thread is embedded in the interior of the paper web, and having lying between the land areas in which the microlens thread protrudes on the surface of the paper web, and the microlens thread is introduced into the paper web and thereby on its underside and in the web areas on its upper side with the Paper web is connected, wherein the paper web with the introduced microlens thread forms the security paper.
Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Mikrolinsenfaden vor der Einbringung in die Papierbahn auf seiner Oberseite mit einer Klebstoffschicht in Gestalt des Stegmusters versehen wird, und der Mikrolinsenfaden in Schritt E) registriert in die Papierbahn eingebracht wird, so dass die mit Klebstoff beschichteten Bereiche des Mik- rolinsenfadens mit den Stegbereichen der Papierbahn zusammenfallen. A method according to claim 1, characterized in that the microlens thread is provided on its upper side with an adhesive layer in the form of the web pattern prior to introduction into the paper web, and the microlens thread registered in step E) is introduced into the paper web, so that the coated with adhesive Areas of the mic rolinsenfadens coincide with the web portions of the paper web.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass der Mik- rolinsenfaden ein Motiv mit einem Motivsprung enthält, wobei der Mikro- linsenfaden registriert eingebracht wird, so dass der Motivsprung in einem der Stegbereiche der Papierbahn zu liegen kommt. 3. The method according to claim 2, characterized in that the microlens filament contains a motif with a motif jump, wherein the microlens filament is registered so that the motif jump comes to rest in one of the web regions of the paper web.
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeich- net, dass die Klebstoff Schicht ein Klebstoffmuster mit einer Abfolge von unbeschichteten Bereichen und mit Klebstoff beschichteten Bereichen bildet, wobei die mit Klebstoff beschichteten Bereiche jeweils eine bis zu 50%, vorzugsweise bis zu 10%, kleinere Abmessung haben als die Stegbereiche der Papierbahn. 4. The method according to any one of claims 1 to 3, characterized marked, that the adhesive layer forms an adhesive pattern with a sequence of uncoated areas and adhesive-coated areas, wherein the adhesive-coated areas each one up to 50%, preferably to to 10%, have smaller dimensions than the web areas of the paper web.
5. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Mik- rolinsenfaden unmittelbar vor dem Einlaufen in die Papierbahn gezielt in den Bereichen seiner Oberseite mit Klebstoff beschichtet wird, die bei der Blattbildung unterhalb von Stegbereichen der Papierbahn zu liegen kom- men. 5. The method according to claim 1, characterized in that the microlens filament is coated directly before entering the paper web targeted in the areas of its upper side with adhesive that comes to lie in the sheet formation below land areas of the paper web.
6. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Mikrolinsenfaden vor der Einbringung in die Papierbahn in einem Öffnungsbereich in Gestalt des Stegmusters mit einer Mehrzahl von6. The method according to claim 1, characterized in that the microlens thread prior to introduction into the paper web in an opening region in the form of the web pattern with a plurality of
Öffnungen versehen wird, und der Mikrolinsenfaden in Schritt E) registriert in die Papierbahn eingebracht wird, so dass die mit Öffnungen versehenen Bereiche des Mik- rolinsenfadens mit den Stegbereichen der Papierbahn zusammenfallen. Openings is provided and the microlens thread is registered in step E) introduced into the paper web, so that the apertured areas of the microfine rolinsenfadens coincide with the web portions of the paper web.
7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass der Mik- rolinsenfaden ein Motiv mit einem Motivsprung enthält, wobei der Mikro- linsenfaden registriert eingebracht wird, so dass der Motivsprung in einem der Stegbereiche der Papierbahn zu liegen kommt. 7. The method according to claim 6, characterized in that the microlens filament contains a motif with a motif jump, the microlens filament being introduced in a registered manner, so that the motif jump comes to rest in one of the web regions of the paper web.
8. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Mik- rolinsenfaden unmittelbar vor dem Einlaufen in die Papierbahn gezielt in den Bereichen seiner Oberseite mit Öffnungen versehen wird, die bei der Blattbildung unterhalb von Stegbereichen der Papierbahn zu liegen kommen. 9. Verfahren nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, dass die Öffnungen durch Stanzen oder Laserschneiden erzeugt werden. 8. The method according to claim 1, characterized in that the microlens thread is provided directly before entering the paper web targeted in the areas of its upper side with openings that come to lie in the sheet formation below land areas of the paper web. 9. The method according to any one of claims 6 to 8, characterized in that the openings are produced by punching or laser cutting.
10. Verfahren nach einem der Ansprüche 1 bis 9, dadurch gekennzeich- net, dass die Papierbahn mit dem vorbestimmten Stegmuster in einer Papiermaschine gebildet wird, und der endlose Mikrolinsenfaden in die Papiermaschine einläuft. 10. The method according to any one of claims 1 to 9, characterized marked, that the paper web is formed with the predetermined ridge pattern in a paper machine, and the endless microlens thread enters the paper machine.
11. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass in Schritt M) ein Mikrolinsenfaden bereitgestellt wird, dessen Oberfläche einerseits11. The method according to claim 1, characterized in that in step M) a microlens thread is provided whose surface on the one hand
Teilbereiche mit Mikrolinsen aufweist, welche Teilbereiche vor der Einbringung in die Papierbahn mit Klebstoff beschichtet werden und welche kleiner als die Breite der Stegbereiche des Stegmusters in der Papierbahn sind, und andererseits Teilbereiche mit Mikrolinsen aufweist, die vor der Einbringung in die Papierbahn nicht mit Klebstoff beschichtet werden. Partial areas with microlenses comprises which portions are coated with adhesive before being introduced into the paper web and which are smaller than the width of the web portions of the web pattern in the paper web, and on the other hand has partial areas with microlenses that are not coated with adhesive before being introduced into the paper web.
12. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass in Schritt M) ein Mikrolinsenfaden bereitgestellt wird, dessen Oberseite Teilbereiche mit Mikrolinsen und Mikrolinsen-freie Teilbereiche aufweist, wobei die Mikrolinsen-freien Teilbereiche kleiner als die Breite der Stegbereiche des Stegmusters in der Papierbahn sind, und wobei die Mikrolinsen-freien Teilbereiche vor der Einbringung in die Papierbahn mit Klebstoff beschichtet werden. 12. The method according to claim 1, characterized in that in step M) a microlens thread is provided, whose upper side has partial areas with microlenses and microlens-free partial areas, wherein the microlens-free partial areas are smaller than the width of the web areas of the web pattern in the paper web , and wherein the microlens-free portions are coated with adhesive before being introduced into the paper web.
13. Verfahren nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, dass der Mikrolinsenfaden vor der Einbringung in die Papierbahn auf seiner Unterseite vollflächig mit einer Klebstoff schicht versehen wird. 14. Mikrolinsenfaden zum Einbringen in eine Papierbahn, insbesondere mit einem Verfahren nach Anspruch 12 oder 13, mit einer Oberseite und einer gegenüberliegenden Unterseite, dadurch gekennzeichnet, dass die Oberseite Teilbereiche mit Mikrolinsen aufweist und Mikrolinsen-freie Teilbereiche aufweist, die mit Klebstoff beschichtet sind. 13. The method according to any one of claims 1 to 12, characterized in that the microlens thread is provided over its entire surface with an adhesive layer prior to introduction into the paper web on its underside. 14. microlens thread for introduction into a paper web, in particular with a method according to claim 12 or 13, with an upper side and an opposite lower side, characterized in that the upper part has portions with microlenses and microlens-free portions which are coated with adhesive.
15. Mikrolinsenfaden nach Anspruch 14, dadurch gekennzeichnet, dass die Teilbereiche mit Mikrolinsen und die Mikrolinsen-freien Teilbereiche auf der Oberseite alternierende Streifen bilden, die jeweils vollständig die Breite des Mikrolinsenfadens einnehmen und die in Längsrichtung des Mikrolin- senfadens jeweils eine Ausdehnung zwischen 1 mm und 30 mm, vorzugsweise zwischen 3 mm und 12 mm aufweisen. 15. microlens filament according to claim 14, characterized in that the sub-areas with microlenses and the microlens-free portions form on the top of alternating strips, each fully occupy the width of the microlens thread and senschnadens in the longitudinal direction of the microlens each an extension between 1 mm and 30 mm, preferably between 3 mm and 12 mm.
16. Mikrolinsenfaden nach Anspruch 14 oder 15, dadurch gekennzeichnet, dass die Unterseite des Mikrolinsenfadens vollflächig mit Klebstoff beschichtet ist. 16. microlens thread according to claim 14 or 15, characterized in that the underside of the microlens thread is coated over its entire surface with adhesive.
EP12769595.5A 2011-09-06 2012-09-04 Method for producing a security paper and microlens thread Active EP2753754B2 (en)

Applications Claiming Priority (2)

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DE102011112554A DE102011112554A1 (en) 2011-09-06 2011-09-06 Method for producing a security paper and microlens thread
PCT/EP2012/003695 WO2013034279A2 (en) 2011-09-06 2012-09-04 Method for producing a security paper and microlens thread

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Also Published As

Publication number Publication date
EP2753754B1 (en) 2015-11-18
DE102011112554A1 (en) 2013-03-07
EP2753754B2 (en) 2023-05-24
WO2013034279A3 (en) 2013-07-18
WO2013034279A2 (en) 2013-03-14
US20140238628A1 (en) 2014-08-28

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