EP1922446A1 - Method for producing antifalsification papers, paper mould, and forming element for paper mould - Google Patents

Method for producing antifalsification papers, paper mould, and forming element for paper mould

Info

Publication number
EP1922446A1
EP1922446A1 EP06762343A EP06762343A EP1922446A1 EP 1922446 A1 EP1922446 A1 EP 1922446A1 EP 06762343 A EP06762343 A EP 06762343A EP 06762343 A EP06762343 A EP 06762343A EP 1922446 A1 EP1922446 A1 EP 1922446A1
Authority
EP
European Patent Office
Prior art keywords
characterized
mm
line
paper
papermaking
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.)
Withdrawn
Application number
EP06762343A
Other languages
German (de)
French (fr)
Inventor
Thomas Bodendieck
Uwe Gruszczynski
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
Priority to DE200510032815 priority Critical patent/DE102005032815A1/en
Application filed by Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
Priority to PCT/EP2006/006437 priority patent/WO2007006445A1/en
Publication of EP1922446A1 publication Critical patent/EP1922446A1/en
Application status is Withdrawn legal-status Critical

Links

Classifications

    • 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
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00Wet end of machines for making continuous webs of paper
    • D21F1/44Watermarking devices
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/008Making apertured paper
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/06Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the cylinder type

Abstract

The invention relates to a method for producing an antifalsification paper for security documents or valuable documents, comprising at least one continuous opening (12) exhibiting characteristic irregularities (14) in the edge region thereof. According to the invention, a paper web comprising narrow strips with a contour corresponding to the desired shape of the at least one continuous opening (12) is formed, and the paper web is drained following the formation of the sheet. The region defined by the narrow strips is extracted from the paper web by means of the generated forces.

Description

A method for producing a security paper, papermaking mold element for papermaking

The invention relates to a method for producing a security paper for security or value documents having at least one through opening having characteristic irregularities in the edge region. The invention further relates to a papermaking screen for producing such a security paper and a forming element for use in a sol-chen papermaking.

Security papers and value documents are often equipped to hedge with various authenticity features which allow verification of the authenticity of the security paper or document of value and that simultaneously serve as protection against unauthorized reproduction.

According to the invention, the term "security paper" denotes the unprinted paper, which is usually present in quasi-endless form and is further processed at a later time. When "security document" means a document for its intended

Use is completed. Documents of value in the sense of the present invention include especially banknotes, stocks, bonds, certificates, vouchers, checks, valuable admission tickets and other at risk of counterfeiting documents, such as passports and other identification documents, as well as production duktsicherungselemente, such as labels, seals, packaging and the like , The simplified designation "security paper" or "value document" includes following all such documents and product protection means.

The document WO 95/10420 describes a value document, in which, after its manufacture, a through hole is punched, which is subse- ßend closed on one side with an opening on all sides superior cover. The cover foil is transparent at least in a partial area, so that shines through the attempt to copy the value document the background and is reproduced by the copier accordingly. In this way, counterfeits can be easily recognized. However, the opening produced by punching can be produced by a forger as well. The color copy of a genuine value document no longer has the transparent area, but this area can subsequently punched analogous to the real value document and cover sheet with a matching waste be closed again. Such counterfeits are hard to detect.

As a remedy, in the publication WO 03/054297 it has been suggested, already testify to ER a continuous opening during paper manufacture. Such generated during sheet formation in the opening has

Edge region characteristic irregularities which are not producible subsequently on the finished paper. The irregularities are particularly evident by the lack of a sharp cutting edge or by irregular attachment of fibers in the edge region and extending into the opening individual fibers. Openings so produced have a similarly high security level as a signal generated in papermaking watermark or in papermaking embedded security thread.

However, such openings produced in paper manufacture often vary in quality and are not easy to produce reproducible.

Sometimes there is also the risk that the fiber bundles to close the opening part. Assuming the invention has for its object to provide a generic method, which avoids the disadvantages of the prior art. Specifically, the method is intended to be tamper-proof generated in paper making openings with high reproducibility connect during production.

This object is solved by the features of the independent claims. Further developments of the invention are subject of the subclaims.

According to the invention, in a method of the type mentioned

- a paper web having thin areas in the form of the outline of the desired shape formed at least a through hole on a papermaking screen of, and

- dewatering the paper web after sheet formation, wherein the limited area of ​​the thin portions is dissolved out by the forces arising from the paper web.

The invention is based on the idea not to produce the irregularly edged opening by a full displacement of the fiber already at sheet formation, but rather first create only the outline of the desired shape of the opening in the form of thin places in the paper web during sheet formation. The paper web has in these areas then only a low initial resistance, so that the

Thin spots predetermined breaking locations are introduced into the paper web, by means of which the enclosed area in the subsequent dehydration step can be separated from the still moist paper web. In comparison to conventional methods in which the desired openings are produced by uniform displacement of the fiber, the process now proposed has a lower susceptibility to variations in the sheet formation and to changes in the aperture shape by the mobility of the still wet fiber so that the desired can be orifices very controlled and reproducible introduced. Use of this method irregularly edged openings can be produced with complex shapes in particular outline.

In a preferred embodiment of the method the paper web is formed on a papermaking screen with the applied line-shaped mold elements, which lead into the paper web during sheet formation for the formation of thin spots. The line-shaped forming elements preferably form a substantially closed curve. By "substantially closed" means that the curve formed by the mold elements may be completely closed, or even individual curve sections may be included with intermediate small intermediate webs, by which the dissolution of the umschlos- of the curve sections Senen portion is not prevented. Similarly, individual curve sections remain completely free of fibers, wherein the space enclosed by the thin areas and fiber-free regions area is still connected to the moist paper web and is according to the invention separated from the paper web in the dewatering step.

The shaped elements are formed with advantage by applied to the papermaking line-shaped metal or plastic moldings. The moldings can be, for example soldered, welded or glued to the papermaking. In another, likewise preferred variant, the mold elements are formed by a tightly bonded with the paper line-shaped sealing mass. As a sealing compound, in particular substances present themselves, which can be in the viscous state to apply on the papermaking screen and that connect to an active or passive curing process determines with the papermaking screen.

For example, the sealing compound can be formed by an epoxy-based resin adhesive, a thermally cured solder paste or a UV cured adhesive. In an advantageous embodiment, a UV curing adhesive is first applied over a large area onto the paper web and then acted upon through a mask in desired areas to UV radiation and cured. The uncured portion of the adhesive is washed out, so that a molded member made of UV-cured sealing compound having the desired shape. Further advantageous embodiments and details are described, the disclosure of which is incorporated into the present application in the document WO 03/025281.

In order to guarantee a safe and reproducible release of the enclosed area, preferably, the line-shaped forming elements have a line width between 0.3 mm and 5 mm, particularly preferably between 0.5 mm and 3 mm. The height of the line-shaped forming elements is preferably between 0.5 mm and 2 mm, and in particular between 0.8 mm and 1.5 mm. It is understood that the optimum values ​​for the line width and height can be determined by comparative experiments according to the desired irregularity of the edge profile, the size of the subject, or the characteristics of the paper pulp. According to an advantageous embodiment, the line-shaped mold elements, and therefore the opening produced form a shape having a complex outline, and in particular, a graphic design such as a flower or leaf motif, or a complex geometric shape, such as a multi-pointed star.

In the papermaking screen is particularly advantageously a paper mold for a cylinder machine.

The thin areas are preferably generated during sheet formation with a few superimposed fibers. This ensures that the molds produced on the one hand can not move in the decrease of the paper web from the wire, on the other hand, the strength of the thin areas is extremely low, so that they act in the subsequent dewatering step as predetermined breaking points.

The at least one opening is expediently closed at at least one side of the security paper with a foil element. In some designs, the opening is even sen verschlos- on both sides with a foil.

Even though it has been described above for a paper substrate, the process of the invention is suitable for all substrates with aqueous sheet formation from natural or synthetic fibrous materials, such as wollkämmlingen tree, chemical pulps, fibers of organic or inorganic polymers, and their mixtures.

Further exemplary embodiments and advantages of the invention will be explained below with reference to the figures, has been omitted in which a depiction to scale and proportion faithful reproduction in order to improve their clarity.

Show it:

Fig. 1 is a schematic diagram of a banknote of a security paper according to one embodiment of the invention,

Fig. 2 shows a partial section of a paper machine for manufacturing a security paper according to the invention,

3 is a plan view of a section of the papermaking screen of the paper machine of FIG. 2 with a soldered metal molding,

4 is a plan view provided to the lifted from the papermaking screen and using the metal mold of Fig. 3 with thin spots paper web,

5 shows a cross-section through the paper web of FIG. 4 along the

Line VV, and

Fig. 6 shows a cross section of the paper web of Fig. 5 after the detachment of the limited range of the thin points.

The invention will now be illustrated using the example of a security paper for a banknote. Fig. 1 shows a schematic representation to a banknote 10 with a through opening 12 which is closed by a transparent film strip 16. The through hole 12 was thereby produced during the manufacture of the security paper used for the bank note 10 and has a fibrous, irregular edge region 14. Such edge 14 is characteristic of already produced openings in the sheet formation and can not be subsequently produced by punching or cutting of the paper.

In order to produce such openings 12 with more complex contour shapes, such as the star motif shown in FIG. 1, reproducible, the procedure according to the invention described below.

Fig. 2 shows the a portion of a cylinder mold machine 20, such as is used for the production of security papers. 3 shows a plan view of a section of the cylinder mold 22 of the paper machine 20. The cylinder mold 20 comprises in addition to the cylinder mold 22, a waste transfer roll 24, over which a pick-stretched 26th In order to produce the openings 12, line-shaped on the cylinder mold 22 metal fittings 28 are soldered, form a closed curve in the form of the outline of the opening to be produced, for example, of the star motif 12 of Fig. 1,.

Upon immersion of the cylinder mold 22 in the paper mass 30, the sheet forming is hindered locally in the region of the metal mold parts 28th As shown in the plan view of the produced paper web 32 of the Figure 4 and 5 can be seen the cross section of Fig., 32 thin spots are thus generated 34 in the shape of the metal mold parts 28 and in the shape of the desired Umris- ses in this way in the paper web.

The height of the line-shaped metal fittings 28 is so selected that lie in the area of ​​thin spots 34 after sheet formation, only a few fibers about each other, however, no through hole is produced in the paper web. In the field of thin-film regions 34, the paper web therefore has a low initial resistance, so that the thin areas representing 34 predetermined breaking points. On the other hand, the paper web is continuous in the area of ​​thin-film regions 34, so that the outline shape formed by these does not slip during the removal of the still wet paper web from the cylinder mold 22nd

After sheet formation, the paper web is dewatered in the press section of the 32nd During this operation, forces act perpendicular to the web extension (arrow 36), which separate out the set of acting as predetermined breaking points 34 thin limited inner area from the still moist paper web. The result is a continuous opening 12 having characteristic boundary irregularities 38 (FIG. 6), whose shape is determined by the structure formed by the thin portions 34 outline contour and by the shape of the metal mold parts 28.

In this way the contour of the opening 12 is produced reproducibly in the further continuous paper web, without being influenced by variations in the sheet formation and the inherent mobility of the wet fiber nega- tively.

In the embodiment of Figure 3, the metal 28 parts on a line width of 2 mm and a height of 1 mm. It is understood depending on the desired irregularity of the edge profile, the size of the subject or the characteristics of the pulp that other values ​​for the stroke strength or molding height are eligible. Also, the molded parts can be made of metal 28 instead of a hard plastic, or they may be applied by the viscous state on the screen and subsequently cured sealing compound may be formed.

Claims

P atentanspr ü che
1. A method for producing a security paper for security or value documents, having at least one through opening with char- acteristic irregularities in the edge region, characterized, in that
- on a papermaking screen a paper web having thin areas in the form of the outline of the desired shape of the at least one formed durchgehen- the opening, and
- the paper web wherein the limited area of ​​the thin portions is dissolved out by the forces arising from the paper web is dewatered after sheet formation.
2. The method according to claim 1, characterized in that the paper web is formed on a papermaking screen with the applied line-shaped forming elements which lead during sheet formation for the formation of thin spots in the paper web.
3. The method according to claim 2, characterized in that the line f-shaped forming members form a substantially closed curve.
4. The method of claim 2 or 3, characterized in that the mold elements are formed by moldings on the papermaking applied line-shaped metal or plastic.
5. The method of claim 2 or 3, characterized in that the mold elements are formed by a tightly bonded with the paper line-shaped sealing mass.
6. The method according to at least one of claims 1 to 5, characterized in that thin points are produced with only a few superimposed fibers during sheet formation.
7. The method according to at least one of claims 1 to 6, characterized denotes Ge, that at least one through-hole with a complex outline, and in particular in the form of a photographic subject is generated.
8. The method according to at least one of claims 1 to 7, characterized denotes Ge, that is closed at least one through opening on one or both sides of the security paper with a foil element.
9. papermaking for the production of security paper, the at least one through opening having characteristic irregularities in
having the edge region, characterized in that the papermaking screen with line-shaped mold elements in the form of the outline of which is provided at least a through hole.
10. The papermaking screen according to claim 9, characterized in that the line-shaped mold elements form a substantially closed curve.
11. The papermaking screen according to claim 9 or 10, characterized in that the mold elements are formed by the papermaking applied line-shaped metal or plastic moldings.
12. The papermaking screen according to claim 9 or 10, characterized in that the mold elements are formed by a tightly bonded with the paper line-shaped sealing mass.
13. The papermaking screen according to claim 12, characterized in that the comparison circuit to ground is formed by an epoxy-based resin adhesive, a thermally cured solder paste or a UV-cured adhesive.
14. The papermaking screen according to at least one of claims 9 to 13, characterized in that the line-shaped forming elements preferably between 0.5 mm and 3 mm, a line width between 0.3 mm and 5 mm.
15. The papermaking screen according to at least one of claims 9 to 14, characterized in that the line-shaped mold elements have a height between 0.5 mm and 2 mm, preferably between 0.8 mm and 1.5 mm.
16. The papermaking screen according to at least one of claims 9 to 15, characterized in that the line-shaped mold elements form a shape having a complex outline, in particular a graphic motif.
17. The papermaking screen according to at least one of claims 9 to 16, characterized in that it is a papermaking screen for a cylinder paper machine.
18. Molded element for a papermaking for the production of security paper with at least one through opening having characteristic irregularities in the edge region, characterized in that the shaped element is formed as a line-shaped metal or plastic molded part in the form of the outline of a to be generated through hole of the security paper.
19. A molding element according to claim 18, characterized in that it forms a substantially closed curve.
20. A molding element according to claim 18 or 19, characterized in that it has a line width between 0.3 mm and 5 mm, preferably between 0.5 mm and 3 mm.
21. A molding element according to at least one of claims 18 to 20, characterized in that it has a height between 0.5 mm and 2 mm, preferably between 0.8 mm and 1.5 mm.
EP06762343A 2005-07-12 2006-07-03 Method for producing antifalsification papers, paper mould, and forming element for paper mould Withdrawn EP1922446A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE200510032815 DE102005032815A1 (en) 2005-07-12 2005-07-12 Method for producing a security paper, paper screen and forming element for paper screen
PCT/EP2006/006437 WO2007006445A1 (en) 2005-07-12 2006-07-03 Method for producing antifalsification papers, paper mould, and forming element for paper mould

Publications (1)

Publication Number Publication Date
EP1922446A1 true EP1922446A1 (en) 2008-05-21

Family

ID=37102149

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06762343A Withdrawn EP1922446A1 (en) 2005-07-12 2006-07-03 Method for producing antifalsification papers, paper mould, and forming element for paper mould

Country Status (7)

Country Link
US (1) US8083894B2 (en)
EP (1) EP1922446A1 (en)
CN (1) CN101208474B (en)
BR (1) BRPI0612765B1 (en)
DE (1) DE102005032815A1 (en)
RU (1) RU2402656C2 (en)
WO (1) WO2007006445A1 (en)

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US8083894B2 (en) 2011-12-27
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CN101208474B (en) 2012-08-22
DE102005032815A1 (en) 2007-01-18
WO2007006445A1 (en) 2007-01-18
US20090236061A1 (en) 2009-09-24
RU2008103948A (en) 2009-08-20
CN101208474A (en) 2008-06-25

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