EP1432868A1 - Moule a papier destine a produire des filigranes a deux etages et procede de fabrication - Google Patents

Moule a papier destine a produire des filigranes a deux etages et procede de fabrication

Info

Publication number
EP1432868A1
EP1432868A1 EP02777101A EP02777101A EP1432868A1 EP 1432868 A1 EP1432868 A1 EP 1432868A1 EP 02777101 A EP02777101 A EP 02777101A EP 02777101 A EP02777101 A EP 02777101A EP 1432868 A1 EP1432868 A1 EP 1432868A1
Authority
EP
European Patent Office
Prior art keywords
paper
sealing compound
mask
screen
paper screen
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Withdrawn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
EP02777101A
Other languages
German (de)
English (en)
Inventor
Wittich Kaule
Karlheinz Mayer
Bernd Stumbeck
Wolfgang Wensauer
Günther WILD
Thomas Gerhardt
Andreas Aigner
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
Application filed by Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
Publication of EP1432868A1 publication Critical patent/EP1432868A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/0027—Screen-cloths
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/44—Watermarking devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • 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

Definitions

  • the invention relates primarily to a method for producing a paper screen for paper production with watermarks, in particular for the production of securities, such as banknotes, checks, ID cards and other security papers.
  • the invention further relates to a mask for use in the aforementioned method, a paper sieve which can be produced by means of the nerf and a security paper produced by means of such a paper sieve.
  • Circular screening machines or Fourdrinier machines where paper mass is deposited on a moving paper screen and solidified to such an extent that it can be removed from the paper screen as a moist paper web for further processing such as drying etc.
  • the adhesion of the electrotypes in the relief-like embossed areas is critical.
  • the exact positioning of the Electrotypes difficult in the relief-like areas of the paper screen. It is correspondingly problematic to reattach detached parts in exactly the same position.
  • the present invention is based on the object of proposing a paper screen and a method for producing a paper screen for paper production with a watermark, in which the means responsible for the formation of the watermark can be produced with little effort and with precise positioning even in embossed screen areas and even withstand heavy loads.
  • the invention is based on the consideration that it is not necessary to generate elevations on the paper screen by means of wires or electrotypes in order to close off areas of the paper screen underneath. Rather, it is sufficient if the screen is closed in some way in precisely these areas, namely according to the invention by means of a sealing compound which is partially applied to the paper screen and completely closes the screen at these points.
  • the purpose achieved with conventional electrotypes to hinder the paper accumulation in these areas and to produce very bright spots in the paper in this way is achieved to the same extent by the measure according to the invention.
  • the sealing compound applied to the paper sieve forms a firm connection with the paper sieve, the sealing compound preferably completely enclosing the sieve fabric.
  • Fabrics can be used as sealing compound that can be applied to the sieve in a tough state and can be firmly attached to the sieve after additional treatment or independent hardening.
  • tough adhesives such as systems based on epoxy resins, or solder paste can be used, which only bond firmly to the mesh of the screen after heating.
  • Radiation-curing adhesives such as UV-curable adhesive compounds, can also be used.
  • the invention can be used both on Fourdrinier machines and on rotary sieve machines.
  • the choice of material for the sealing compound is relatively uncritical due to the lower mechanical load, and brittle materials can also be used.
  • higher demands must be placed on the elasticity of the sealing compound, so that the closed paper sieve areas do not break open due to the repeated deflection.
  • materials such as rubber or other elastomers can be used in this case.
  • the invention is also not limited to the production of two-stage watermarks.
  • multi-level watermarks can also be created. If one assigns a certain area coverage of the sealing compound to the different gray tones of image information, more or less paper compound is deposited in the individual areas. Numerous possibilities of applying the sealing compound locally can be imagined.
  • the application can be accomplished, for example, by screen printing, pad printing, spraying technology or knife application.
  • a mask controls the order in each case. The mask can be used for partial application of the sealing compound or for partial hardening of sealing compound applied over a large area.
  • the mask is placed over the paper screen and then the sealing compound is applied to the mask.
  • the mask has cutouts with the contour of the partial area to be closed, so that the sealing compound can only flow into the screen fabric in this partial area and close it.
  • the sealing compound is first applied to the paper screen over a large area and then the same mask is placed over it as in the first exemplary embodiment.
  • the sealing compound is then hardened in the cutouts in the mask, so that the paper screen is only permanently sealed in these areas.
  • a suitable material for an activatable sealing compound is, for example, UN radiation-curing adhesive.
  • uncured compound is washed out of the paper screen.
  • the sealing compound is first applied to the paper screen over a large area and then covered with a mask, which in this case has the shape of the partial area of the paper screen to be closed.
  • the areas of the paper screen that are not covered by the mask are freed of the non-sealing compound, for example by the non-sealing compound is blown off or hosed.
  • the remaining closing compound then hardens actively or passively.
  • the advantage of using masks is that they can be easily designed and machine-made on the computer. With the help of the data generated on the computer, the masks can e.g. by milling, laser cutting or milling or also by etching according to a previously created film template.
  • the application of the sealing compound can be automated, so that the production of a paper screen for generating watermarks by means of the present
  • the invention can be significantly rationalized. Since the positioning of the masks is simple and precise, the invention also has an effect on the quality of the paper screen and the paper produced with it. The quality can also be reproduced at any time if a new identical paper screen is produced.
  • the invention can be used particularly advantageously if a particularly bright watermark area (a so-called “highlight watermark”) is to be generated within a multi-level watermark.
  • these areas are within the embossed screen, preferably in the apex area of the relief with the sealing compound
  • a mask can be used which has a surface structure adapted to the embossed relief of the paper screen, so that the mask, when placed on the paper screen, snaps into the embossed relief of the paper screen.
  • the positioning of the sealing compound relative to the multi-level watermark is exactly defined and 100% repeatable.
  • fiber-reinforcing fillers are preferably added to the sealing compound, such as, for example, glass or carbon fibers in the case of sealing compound based on adhesive, or fine copper threads in the case of sealing compound consisting of solder paste.
  • Figure 1 is a banknote with two-stage watermark 1 and multi-stage watermark 2.
  • Fig. 2 shows schematically a cross section through a paper wire after
  • Fig. 5 schematically shows a cross section through a paper screen after the large-area application of sealing compound and before
  • FIG. 1 shows a banknote which has a plurality of two-stage watermarks 1 in the form of the denomination "100" and a multi-stage watermark 2 in the form of a portrait. Individual two-stage watermarks 1 partially or completely cover the multi-stage watermark 2. Because of the multi-stage watermark the paper for such a banknote is produced on a circular sieving machine with a paper sieve embossed in relief to produce the portrait 2.
  • a method according to the invention is described below with reference to FIG. 2, how a paper sieve 20 is to be produced according to a first embodiment in order to be able to produce a pure two-stage watermark with the paper sieve.
  • a mask 30 is placed over the paper sieve 20, which has cutouts 31 which define those partial areas 11 of the paper sieve 20 in which the paper sieve 20 is to be closed with sealing compound 10.
  • sealing compound 10 is applied, which only penetrates through the mask 30 into the paper screen 20 in the recesses 31 and completely closes the tissue of the paper screen 20.
  • the mask 30 is removed and the sealing compound either cures passively or the curing process is activated, depending on the sealing compound material, for example by temperature control or UV radiation.
  • the sealing compound 10 can first be cured or allowed to harden and only then can the mask 30 be removed, as a result of which the contour of the two-stage watermark is given a particularly precise and sharp delimitation! It must be taken into account that the size relationships in FIG. 2 do not correspond to reality.
  • the thickness of the mask 30 is shown oversized compared to the thickness of the paper screen 20.
  • the screen After the sealing compound has bonded to the structure of the paper screen 20 and has completely closed it in these areas, the screen is partially impermeable to water, as a result of which the paper accumulation at these points is hindered during the paper production. These areas appear in the paper produced with such a paper screen in transmitted light as very bright areas compared to the surrounding paper material.
  • FIG. 2 While the method described with reference to FIG. 2 is suitable both for the production of a paper screen for a longitudinal screening machine and for a circular screening machine, the same method is described below with reference to FIG. 3 specifically for use in a circular screening machine, in which subregions 11 a relief-like embossed paper screen 20 can be provided with sealing compound.
  • the surface of the mask 30 adjoining the paper screen 20 has a surface structure 32 which, in the manner of a negative relief, affects the relief-like structure of the paper screen 20 and at the same time also the curvature thereof the use of the paper screen 20 in a rotary screen machine is conditioned, is adapted. Otherwise, the procedure for closing the partial areas 11 with sealing compound 10 does not differ from the method described with reference to FIG. 2.
  • the mask 30 is placed on the paper screen 20 in such a way that its surface structure 32 snaps into the relief-like structure of the paper screen 20.
  • the sealing compound 10 is applied to the mask 30, so that the sealing compound 10 through the cutouts in the mask 30 into the Paper screen penetrates and thus only surrounds the screen fabric in the partial areas 11 of the paper screen 20.
  • the excess closure material is then removed from the mask 30 (state in FIG. 3) and the mask 30 is removed from the paper screen 20.
  • the sealing compound 10 is cured or, if necessary, the curing compound 10 is first cured and then the mask 30 is removed.
  • a second embodiment of the method according to the invention is described below with reference to FIG. Accordingly, in a first method step, the sealing compound 10 is applied to the paper screen 20 over a large area, so that it completely flows around the screen fabric and closes it.
  • “large area” means an area that is larger than the partial areas 11 of the paper screen 20 that are ultimately to be permanently closed with sealing compound, which areas will be responsible for the later creation of a watermark during paper manufacture.
  • the same mask 30, which is also used in connection with the exemplary embodiment according to FIG. 2 is placed over it, and the hardening of the sealing compound 10 in the partial areas 11, which is caused by the recesses 31 of the mask 30 are defined, is activated in the exemplary embodiment shown by means of UN radiation sources 40.
  • the mask 30 is removed and the non-hardened regions of the sealing compound 10 are washed out, so that they are permeable again. As a result, a paper screen 20 is obtained with the same configuration as can be obtained with the method described with reference to FIG. 2.
  • the closure mass 10 as already described with reference to FIG. 4, applied to the paper screen 20 over a large area and a mask 30 placed thereon, the outer contour 33 of which corresponds to the shape of the partial area 11 to be closed.
  • the areas of the sealing compound 10 which are not covered by the mask 30 are removed, for example blown out through the paper screen 20, and the portion of the sealing compound 10 remaining in the partial areas 11 is then hardened.
  • hardening can first take place in the partial areas 11, for example by using a heated mask 30 and a thermosetting sealing compound 10, and the remaining, uncured part of the sealing compound 10 is subsequently removed, for example washed out.
  • Particularly suitable as a sealing compound are substances which can be applied to the paper screen 20 in the tough state and which, after their active or passive curing, firmly bond to the paper screen.
  • Tough adhesives are suitable, such as systems based on epoxy resin, but also solder paste, such as is used in SMD technology, for example, and which only bonds firmly to the mesh of the paper screen after it has been heated.
  • Sealing compounds based on a UV-curable adhesive are also suitable. This applies primarily to the method described with reference to FIG. 4.
  • the sealing compound In order to increase the stability and bond strength of the sealing compound, it can be mixed with fillers, for example with glass or carbon fibers in the case of adhesives and with fine copper threads in the case of solder paste.
  • the application of the sealing compound 10 to the paper sieve 20 can be done by screen printing, pad printing, spraying, knife coating and other common methods Methods take place, the location-specific application preferably being controlled by the mask 30.
  • the mask 30 can be designed on a computer and can be produced automatically by means of CAD / CAM technology by milling, laser cutting or laser milling. Etching mask 30 from a film template is also practical.

Landscapes

  • Paper (AREA)
  • Printing Methods (AREA)

Abstract

L'invention concerne un moule à papier (20) destiné à produire des filigranes à deux étages (1). Selon l'invention, certaines sections du moule à papier (20) sont entièrement scellées au moyen d'une masse de scellement visqueuse (10) qui est durcie par la suite de manière active ou passive. Lors de la fabrication du papier, toute accumulation de papier est empêchée dans lesdites sections du moule à papier (20) ainsi scellées, de manière que le papier fini soit transparent dans lesdites sections. Un masque (30) sert à placer exactement la masse de scellement (10) dans lesdites sections du moule à papier et/ou à durcir la masse de scellement (10) uniquement dans les sections prédéfinies, les sections non durcies de la masse de scellement (10) étant lavées dans ce dernier cas.
EP02777101A 2001-09-17 2002-09-13 Moule a papier destine a produire des filigranes a deux etages et procede de fabrication Withdrawn EP1432868A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10145782A DE10145782A1 (de) 2001-09-17 2001-09-17 Papiersieb zur Erzeugung zweistufiger Wasserzeichen und Verfahren zu dessen Herstellung
DE10145782 2001-09-17
PCT/EP2002/010317 WO2003025281A1 (fr) 2001-09-17 2002-09-13 Moule a papier destine a produire des filigranes a deux etages et procede de fabrication

Publications (1)

Publication Number Publication Date
EP1432868A1 true EP1432868A1 (fr) 2004-06-30

Family

ID=7699315

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02777101A Withdrawn EP1432868A1 (fr) 2001-09-17 2002-09-13 Moule a papier destine a produire des filigranes a deux etages et procede de fabrication

Country Status (10)

Country Link
US (1) US8524039B2 (fr)
EP (1) EP1432868A1 (fr)
KR (1) KR100965039B1 (fr)
CN (1) CN1266335C (fr)
DE (1) DE10145782A1 (fr)
HU (1) HU228322B1 (fr)
PL (1) PL200780B1 (fr)
RU (1) RU2300596C2 (fr)
UA (1) UA76200C2 (fr)
WO (1) WO2003025281A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022048794A1 (fr) 2020-09-07 2022-03-10 Giesecke+Devrient Currency Technology Gmbh Papier vert pour la production d'une couche de diffusion gazeuse pour une pile à combustible
WO2022048796A1 (fr) 2020-09-07 2022-03-10 Giesecke+Devrient Currency Technology Gmbh Procédé de fabrication de papier vert destiné à la fabrication d'une couche de diffusion gazeuse pour une pile à combustible

Families Citing this family (18)

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DE102005032815A1 (de) * 2005-07-12 2007-01-18 Giesecke & Devrient Gmbh Verfahren zur Herstellung eines Sicherheitspapiers, Papiersieb und Formelement für Papiersieb
DE102005042344A1 (de) * 2005-09-06 2007-03-08 Giesecke & Devrient Gmbh Entwässerungssieb und Verfahren zu seiner Herstellung
DE102006058513A1 (de) * 2006-12-12 2008-06-19 Giesecke & Devrient Gmbh Entwässerungssieb und Verfahren zu seiner Herstellung
DE102008024401B3 (de) * 2008-05-20 2010-01-07 Hans Grossmann Entwässerungssieb für eine Saugwalze einer Papiermaschine
MX2011000048A (es) 2008-07-07 2011-02-22 Voith Patent Gmbh Metodo para producir un diseño en una tira sinfin.
FR2940328B1 (fr) * 2008-12-22 2016-07-08 Banque De France Procede de fabrication d'un substrat fibreux a fenetre
DE102009044609B3 (de) 2009-11-20 2011-04-28 Schoen + Sandt Machinery Gmbh Verfahren und Vorrichtung zur Herstellung eines mit Elektrotypen belegten Metallsiebs
RU2407648C1 (ru) * 2009-12-28 2010-12-27 Федеральное Государственное Унитарное Предприятие "Гознак" (Фгуп "Гознак") Защищенная от подделки бумага, содержащая водяные знаки с многотоновым эффектом, и сетка для изготовления этой бумаги
IT1400463B1 (it) * 2010-05-06 2013-05-31 Cartiere Fedrigoni & C Spa Procedimento per la realizzazione di una tela filigranatrice, tela filigranatrice e impianto per il suo ottenimento
RU2578983C1 (ru) * 2012-03-19 2016-03-27 Де Ля Рю Интернэшнл Лимитед Усовершенствования в способах изготовления защитных признаков
DE102012014894A1 (de) * 2012-07-27 2014-01-30 Giesecke & Devrient Gmbh Entwässerungssieb
RU2502842C1 (ru) * 2012-11-23 2013-12-27 Федеральное Государственное Унитарное Предприятие "Гознак" (Фгуп "Гознак") Способ изготовления бумаги с охраняющим элементом, охраняющий элемент и способ его изготовления
DE102013223068A1 (de) 2013-11-13 2015-05-13 Schaeffler Technologies AG & Co. KG Reibring
ES2906151T3 (es) * 2014-07-28 2022-04-13 Voith Patent Gmbh Procedimiento para la fabricación o el mecanizado de un rodillo, rodillo y capa funcional de un rodillo
BR112019017363B1 (pt) * 2017-02-27 2023-02-23 Crane & Co., Inc Papel que inclui uma ou mais marcas d'água multitonais que têm tonalidade plena, e uma ferramenta para marcação d'água aprimorada para fabricar tal papel
CN109702198B (zh) * 2019-03-12 2021-04-09 成都印钞有限公司 一种获得高亮水印的水印网笼制作方法
CN110512465B (zh) * 2019-08-28 2021-11-09 泰中特种纸有限公司 一种量子点辅助沉积制备彩色防伪水印纸的方法
CN110820406A (zh) * 2019-10-30 2020-02-21 山东凯丽特种纸股份有限公司 一种免印刷双层结构艺术图形纸、及其生产方法及装置

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022048794A1 (fr) 2020-09-07 2022-03-10 Giesecke+Devrient Currency Technology Gmbh Papier vert pour la production d'une couche de diffusion gazeuse pour une pile à combustible
WO2022048796A1 (fr) 2020-09-07 2022-03-10 Giesecke+Devrient Currency Technology Gmbh Procédé de fabrication de papier vert destiné à la fabrication d'une couche de diffusion gazeuse pour une pile à combustible
DE102020005480A1 (de) 2020-09-07 2022-03-10 Giesecke+Devrient Currency Technology Gmbh Grünpapier zur Herstellung eines Gas-Diffusion-Layers für eine Brennstoffzelle
DE102020005477A1 (de) 2020-09-07 2022-03-10 Giesecke+Devrient Currency Technology Gmbh Verfahren zur Herstellung eines Grünpapiers zur Herstellung eines Gas-Diffusion-Layers für eine Brennstoffzelle

Also Published As

Publication number Publication date
PL200780B1 (pl) 2009-02-27
KR100965039B1 (ko) 2010-06-21
PL367995A1 (en) 2005-03-21
US8524039B2 (en) 2013-09-03
WO2003025281A1 (fr) 2003-03-27
UA76200C2 (en) 2006-07-17
RU2004111790A (ru) 2005-09-27
KR20040054686A (ko) 2004-06-25
DE10145782A1 (de) 2003-04-10
US20040249754A1 (en) 2004-12-09
RU2300596C2 (ru) 2007-06-10
CN1266335C (zh) 2006-07-26
HUP0401448A2 (en) 2004-10-28
HU228322B1 (hu) 2013-03-28
CN1555443A (zh) 2004-12-15

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