EP1937893B1 - Tamis d'egouttage et procede de fabrication dudit tamis - Google Patents

Tamis d'egouttage et procede de fabrication dudit tamis Download PDF

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Publication number
EP1937893B1
EP1937893B1 EP06776829A EP06776829A EP1937893B1 EP 1937893 B1 EP1937893 B1 EP 1937893B1 EP 06776829 A EP06776829 A EP 06776829A EP 06776829 A EP06776829 A EP 06776829A EP 1937893 B1 EP1937893 B1 EP 1937893B1
Authority
EP
European Patent Office
Prior art keywords
watermark
dewatering screen
plate
carrier mold
dewatering
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.)
Not-in-force
Application number
EP06776829A
Other languages
German (de)
English (en)
Other versions
EP1937893A2 (fr
Inventor
Bernd Stumbeck
André Gregarek
Andreas HÄNELT
Thomas Gerhardt
Karlheinz Mayer
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 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
Priority to PL06776829T priority Critical patent/PL1937893T3/pl
Priority to SI200630875T priority patent/SI1937893T1/sl
Publication of EP1937893A2 publication Critical patent/EP1937893A2/fr
Application granted granted Critical
Publication of EP1937893B1 publication Critical patent/EP1937893B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • D21F1/44—Watermarking devices
    • 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
    • D21F1/0036—Multi-layer screen-cloths
    • 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 to a dewatering screen for the production of multilevel watermarked paper, in particular for the production of securities such as banknotes, checks, identity cards and other security papers.
  • the invention further relates to a method for producing such a dewatering screen and to a method for producing a paper having a multi-level watermark using such a dewatering screen.
  • multi-level In the production of paper with watermarks, a distinction is made between two-level watermarks with a strong light-dark effect and multi-level watermarks with smooth transitions between light and dark and detailed representation of a motif.
  • multi-level is to be understood in contrast to two-stage light-dark watermark and includes all watermarks with more than two brightness levels and includes in particular watermarks with continuous light-dark transitions.
  • electrotypes metal wires or metal moldings, called electrotypes, are applied to the screen structure to produce two-stage watermarks soldered to completely close the drainage screen at these locations.
  • electrotypes metal wires or metal moldings
  • DE 100 64 006 A1 discloses a dewatering screen for the manufacture of multilevel watermarked paper consisting of a carrier wire and a watermark sheet connected thereto.
  • the present invention seeks to provide a dewatering screen of the type mentioned, which avoids the disadvantages of the prior art and in particular allows the production of paper with multi-level watermark high brightness.
  • a dewatering screen of the type mentioned in the introduction comprises a carrier screen and a perforated watermark plate connected to the carrier screen, wherein the carrier screen and the watermark plate are stamped together in the form of the watermark to be produced.
  • the perforations of the watermark sheet ensure dewatering during paper production.
  • the watermark sheet is provided with microperforations, the dimensions of which are so small that fibers do not adhere to them during papermaking.
  • the watermark sheet may in particular be provided with microperforation having a diameter of less than 0.6 mm, preferably less than 0.25 mm, more preferably less than 0.2 mm. Micro perforations with a diameter of 0.17 mm are particularly suitable.
  • the watermark sheet may have perforations of the same diameter throughout. Of course, it is also possible to combine perforations with different diameters.
  • the perforations of the watermark sheet are preferably arranged regularly and in the form of a matrix in the form of rows and columns. Lines lying one above the other can also be offset from each other by half a hole-to-hole distance.
  • the surface of the watermark sheet is advantageously smooth, so that attach only comparatively few fibers, so that the subsequent watermark a high overall brightness having. Due to the greater brightness, it is advisable to apply the design of the watermark according to the invention sharper than in conventional watermarks and to perform the embossing with a slightly lower modulation.
  • the watermark sheet also has recesses in the form of patterns, characters or codes.
  • These recesses in contrast to the microperforations, are formed with such dimensions that fibers form in them during sheet formation so that the recesses create dark spots in the later watermark.
  • the dimensions of the recesses are typically a few millimeters.
  • the dewatering screen may additionally comprise at least one imperforate metal or plastic molded part adjacent to the watermark sheet for producing two-level watermarks.
  • the watermark sheet in particular the mentioned recesses of the watermark sheet and the adjacent unperforated metal / plastic molding represent information related to each other.
  • the recesses and the molded parts can complement each other to form a contiguous sequence of numbers or a coherent text.
  • the digit string or text may be further related to a graphic motif represented by the watermark sheet.
  • the watermark sheet may show a portrait or architectural motif
  • the recesses and / or moldings may represent a text associated with the motif, such as a name or a signature.
  • the number sequence can also form another independent information, such as the denomination of a banknote.
  • the watermark sheet is preferably glued to the support screen, soldered or welded.
  • the carrier screen is formed by a screen fabric with at least one system of interwoven, longitudinally extending warp threads and weft threads running transversely thereto.
  • the screen fabric may in particular have a single-layer or double-layered binding.
  • the carrier screen is formed by a galvanically produced screen.
  • Such screens have no nodes as they arise through crossovers in the filaments of a conventional sieve.
  • the overall thickness of the screen may be less than that of conventional screens.
  • the carrier screen is formed by a carrier plate provided with drainage openings.
  • such carrier plates have no nodes, so that the total thickness of the screen may possibly be less than in conventional screens and can be used with less material gap when milling the embossing sticks.
  • the Smoother screen surface can lead to much sharper watermarks. Also can be produced in this way inserts for a module screen. It is only necessary to produce small units and use as a module in wells.
  • a computer file performs a desired watermark corresponding milling in plastic.
  • a computer file performs a desired watermark corresponding milling in plastic.
  • electrically conductive printing ink such as silver conductive paint
  • a very fine screen structure is printed on the plastic matrix.
  • a metal layer is deposited along this screen structure in the galvanic bath.
  • the screen structure can also be applied to the plastic matrix by means of photographic processes, similar to the production of semiconductor devices.
  • a sheet metal layer shaped in accordance with the milling does not deposit, as is the case with electroplated embossing dies, but already a finished screen structure. This can then be soldered or welded onto a carrier screen.
  • the sieve structure produced in this way like galvanic sieves, has no nodes and thus allows full sharpness and the finest details in the watermark.
  • the process of embossing can be omitted. This also eliminates the process of converting from the computer file to the watermark, which often results in some alteration of the original. Furthermore, it can already be taken into account when creating the screen structure to be printed on the plastic, where the subsequent watermark is to have particularly light or dark spots, in that the line thickness to be printed on is varied accordingly. This leads to different drainage behavior in the Watermark area and thus allows a large and accurately controllable contrast increase over conventional technology.
  • the described drainage screens may be round screens or wire screens or inclined screens.
  • a sheet is preferably cut out according to the contour of the desired watermark and provided with microperforations, the dimensions of which are so small that they do not adhere to fibers during papermaking.
  • the microperforations are advantageously produced by means of etching or with a laser beam.
  • the watermark sheet is applied to the support screen, preferably glued or welded.
  • a carrier screen in particular a screen mesh can be provided in step a).
  • a carrier screen can be produced in the galvanic bath or a support plate may be provided with drainage openings to form a support screen.
  • the invention further comprises a method for producing a paper, in particular a security paper, with multistage watermarks, in which the paper attachment takes place on a dewatering screen of the type described.
  • Fig. 1 shows a schematic representation of a banknote 10, a bright multi-level watermark 12 in the form of an in Fig. 1 contains only suggested portraits.
  • the bright watermark 12 produced according to the invention is shown in FIG Fig. 2 (a) shown in detail. Especially in comparison with the conventional watermark 14 of Fig. 2 (b) the significantly higher overall brightness of the watermark 12 according to the invention can be seen.
  • FIG. 3 a plan view of a section of a dewatering screen 20 according to the invention.
  • Fig. 4 represents the cutout 40 in the edge region of the watermark plate 24 in detail and
  • Fig. 5 schematically shows a cross section of the Entskyssungssiebs 20 along the line VV of Fig. 3 ,
  • the dewatering screen 20 comprises a carrier screen, which in the exemplary embodiment is formed by a screen cloth 22, and a microperforated watermark plate 24, which is welded onto the screen cloth 22.
  • a carrier screen which in the exemplary embodiment is formed by a screen cloth 22, and a microperforated watermark plate 24, which is welded onto the screen cloth 22.
  • the watermark sheet 24 is cut according to the contour 26 of the desired watermark, here the outline of the portrait 12, and provided with a regular matrix-shaped arrangement of micro-perforations 28 to ensure the dewatering in papermaking.
  • the microperforations 28 in the exemplary embodiment have a diameter of 0.18 mm and a perforation-to-perforation distance of 0.20 mm. With this small diameter, no paperwork can be used Adhere fibers in the perforations 28 so that they can not interfere with the later watermark.
  • the microperforations 28 may be introduced into the watermarked sheet 24 by conventional techniques such as etching or laser.
  • the screen fabric 22 and the welded watermark sheet 24 are inventively embossed together according to the relief structure of the desired watermark, as in the cross-sectional view of Fig. 5 shown schematically.
  • the modulation height M of the embossing is chosen to be somewhat lower than in the case of conventional watermarks and may be, for example, about 0.9 mm.
  • the high brightness of the watermarks generated by the dewatering screen 20 is mainly due to the smooth surface of the watermark plate 24, to which only comparatively few fibers can adhere. Because of the greater overall brightness, the watermark design 12 is sharper than conventional watermarks.
  • the watermark sheet 24 may further include selectively formed recesses 30 in the form of patterns, characters, and encodings that result in dark spots in the later watermark.
  • the watermark sheet 24 can also be combined with imperforate molded parts 32 made of metal or plastic, in particular the so-called electrotypes, which produce, for example, two-stage watermarks to represent the denomination of a banknote.
  • the recesses 30 and the molded parts 32 can also represent information related to one another, for example two parts of a total information.
  • the total information from the number sequence "1357911", of which the subsequence "135" is formed by recesses 30 in the watermark sheet 24 and the subsequence "7911” by welded metal mold parts 32.
  • the numbers "135" then appear as a dark place, the numbers "7911” as an immediately adjoining highlight.
  • an alphanumeric string such as a signature or the like, may be used instead of the digit string.

Landscapes

  • Paper (AREA)
  • Filtering Materials (AREA)
  • Water Treatment By Sorption (AREA)
  • Centrifugal Separators (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Fertilizers (AREA)

Claims (26)

  1. Toile d'égouttage (20) pour la fabrication de papier présentant des filigranes à plusieurs niveaux, comportant une toile support (22) et une plaque perforée de filigranage (24) assemblée à la toile support, la toile support (22) et la plaque de filigranage (24) étant simultanément estampées sous forme du filigrane à produire.
  2. Toile d'égouttage selon la revendication 1, caractérisée en ce que la plaque de filigranage (24) est pourvue de microperforations (28), dont les dimensions sont petites au point que, lors de la fabrication du papier, aucune fibre n'y adhère.
  3. Toile d'égouttage selon la revendication 1 ou 2, caractérisée en ce que la plaque de filigranage (24) est pourvue de microperforations (28) ayant un diamètre inférieur à 0,6 mm, de préférence inférieur à 0,25 mm.
  4. Toile d'égouttage selon au moins l'une des revendications 1 à 3, caractérisée en ce que la plaque de filigranage (24) comporte un arrangement régulier de perforations (28), en forme de matrice.
  5. Toile d'égouttage selon au moins l'une des revendications 1 à 4, caractérisée en ce que la surface de la plaque de filigranage (24) est lisse.
  6. Toile d'égouttage selon au moins l'une des revendications 1 à 5, caractérisée en ce que la plaque de filigranage (24) comprend des évidements (30) sous forme de modèles, de signes ou de codages.
  7. Toile d'égouttage selon au moins l'une des revendications 1 à 6, caractérisée en ce que la toile d'égouttage (20) comprend au moins une pièce moulée (32), en un métal/une matière plastique, non perforée, adjacente à la plaque de filigranage (24), pour produire des filigranes à deux niveaux.
  8. Toile d'égouttage selon la revendication 7, caractérisée en ce que la plaque de filigranage (24) et la pièce moulée (32) en un métal/une matière plastique, non perforée et adjacente, comprennent des informations rapportées les unes aux autres.
  9. Toile d'égouttage selon au moins l'une des revendications 1 à 8, caractérisée en ce que la plaque de filigranage (24) est collée ou soudée à la toile support (22).
  10. Toile d'égouttage selon au moins l'une des revendications 1 à 9, caractérisée en ce que la toile support (22) est formée d'une gaze métallique.
  11. Toile d'égouttage selon au moins l'une des revendications 1 à 9, caractérisée en ce que la toile support (22) est formée d'une toile fabriquée par un procédé électrolytique sans noeuds.
  12. Toile d'égouttage selon au moins l'une des revendications 1 à 9, caractérisée en ce que la toile support (22) est formée d'une plaque support pourvue d'ouvertures d'égouttage.
  13. Toile d'égouttage selon au moins l'une des revendications 1 à 12, caractérisée en ce qu'il s'agit d'une forme ronde.
  14. Toile d'égouttage selon au moins l'une des revendications 1 à 12, caractérisée en ce qu'il s'agit d'une table plate ou d'une toile oblique.
  15. Procédé de fabrication d'une toile d'égouttage pour la fabrication du papier, comportant des filigranes à plusieurs niveaux, dans lequel
    a) on met à disposition une toile support et une plaque de filigranage perforée,
    b) on assemble la plaque de filigranage à la toile support ; et
    c) on estampe en même temps, sous forme du filigrane à produire, la toile support et la plaque de filigranage.
  16. Procédé selon la revendication 15, caractérisé en ce que, pour la mise à disposition de la plaque de filigranage perforée dans l'étape a), on découpe une plaque le long du contour du filigrane souhaité et on la pourvoit de microperforations, dont les dimensions sont petites au point que, lors de la fabrication du papier, aucune fibre n'y adhère.
  17. Procédé selon la revendication 16, caractérisé en ce que les microperforations sont produites par une technique de gravure ou à l'aide d'un faisceau laser.
  18. Procédé selon au moins l'une des revendications 15 à 17, caractérisé en ce que la plaque de filigranage est collée ou soudée à la toile support.
  19. Procédé selon au moins l'une des revendications 15 à 18, caractérisé en ce que, en tant que toile support dans l'étape a), on met à disposition une gaze métallique.
  20. Procédé selon au moins l'une des revendications 15 à 18, caractérisé en ce que, pour la mise à disposition de la toile support dans l'étape a), on fabrique une toile dans un bain électrolytique.
  21. Procédé selon au moins l'une des revendications 15 à 18, caractérisé en ce que, pour la mise à disposition de la toile support dans l'étape a), on pourvoit une plaque support d'ouvertures d'égouttage.
  22. Procédé selon au moins l'une des revendications 15 à 21, caractérisé en ce que la toile support et la plaque de filigranage sont, dans l'étape c), estampées selon une modulation plus petite que lors des estampages classiques de filigranes.
  23. Procédé selon au moins l'une des revendications 15 à 22, caractérisé en ce que la toile support et la plaque de filigranage sont, dans l'étape c), estampées avec une modulation d'estampage d'environ 1 mm ou moins.
  24. Procédé de fabrication d'un papier, en particulier d'un papier de sécurité, comportant un filigrane à plusieurs niveaux, dans lequel la mise en place du papier s'effectue sur une toile d'égouttage selon l'une des revendications 1 à 14.
  25. Procédé selon la revendication 24, caractérisé en ce que la fabrication du papier a lieu sur une machine à forme ronde.
  26. Procédé selon la revendication 24, caractérisé en ce que la fabrication du papier s'effectue sur une machine à table plate ou à toile oblique.
EP06776829A 2005-09-06 2006-08-14 Tamis d'egouttage et procede de fabrication dudit tamis Not-in-force EP1937893B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL06776829T PL1937893T3 (pl) 2005-09-06 2006-08-14 Sito odwadniające oraz sposób jego wykonania
SI200630875T SI1937893T1 (sl) 2005-09-06 2006-08-14 Filter za odstranjevanje vode in postopek izdelave le-tega

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005042344A DE102005042344A1 (de) 2005-09-06 2005-09-06 Entwässerungssieb und Verfahren zu seiner Herstellung
PCT/EP2006/008017 WO2007028485A2 (fr) 2005-09-06 2006-08-14 Tamis d'egouttage et procede de fabrication dudit tamis

Publications (2)

Publication Number Publication Date
EP1937893A2 EP1937893A2 (fr) 2008-07-02
EP1937893B1 true EP1937893B1 (fr) 2010-11-03

Family

ID=37735593

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06776829A Not-in-force EP1937893B1 (fr) 2005-09-06 2006-08-14 Tamis d'egouttage et procede de fabrication dudit tamis

Country Status (7)

Country Link
EP (1) EP1937893B1 (fr)
AT (1) ATE486998T1 (fr)
DE (2) DE102005042344A1 (fr)
ES (1) ES2353817T3 (fr)
PL (1) PL1937893T3 (fr)
SI (1) SI1937893T1 (fr)
WO (1) WO2007028485A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104711889A (zh) * 2013-12-17 2015-06-17 德国捷德有限公司 排水筛网和排水筛网的制造方法

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008024401B3 (de) * 2008-05-20 2010-01-07 Hans Grossmann Entwässerungssieb für eine Saugwalze einer Papiermaschine
FR2957943B1 (fr) * 2010-03-24 2021-11-05 Arjowiggins Security Filigrane, procedes de fabrication d'une piece pour la formation d'un filigrane et piece obtenue selon ledit procede
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
DE102012024774A1 (de) * 2012-12-18 2014-06-18 Giesecke & Devrient Gmbh Entwässerungssieb für die Papierherstellung
EP2828432B2 (fr) * 2012-03-19 2022-06-29 Portals Paper Limited Électrotype pour former une image pendant un procédé de fabrication de papier
CH709680A1 (de) 2014-05-21 2015-11-30 Landqart Ag Entwässerungssieb für die Herstellung von Papier mit wenigstens einem Wasserzeichen und damit hergestelltes Papier mit einem Wasserzeichen.
GB2532084B (en) 2014-11-10 2017-09-06 De La Rue Int Ltd Improvments in watermarking
RU2019130344A (ru) * 2017-02-27 2021-03-29 Крейн Энд Ко., Инк. Бумага, включающая в себя один или более многотоновых водяных знаков, имеющих полную тональность, и усовершенствованный инструмент для нанесения водяных знаков для изготовления такой бумаги
WO2019033889A1 (fr) * 2017-08-17 2019-02-21 保定钞票纸业有限公司 Procédé de préparation de papier susceptible de réguler la luminosité de filigrane et produit de papier comprenant un filigrane à haute luminosité

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2804447B1 (fr) * 2000-02-01 2002-04-05 Arjo Wiggins Sa Papier comportant un filigrane a effet multiton et toile pour fabriquer ce papier
DE10064006A1 (de) * 2000-12-21 2002-07-04 Giesecke & Devrient Gmbh Wasserzeichenform für die Papierherstellung und Verfahren zur Applizierung derselben auf einem Schöpfsieb
DE10145782A1 (de) * 2001-09-17 2003-04-10 Giesecke & Devrient Gmbh Papiersieb zur Erzeugung zweistufiger Wasserzeichen und Verfahren zu dessen Herstellung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104711889A (zh) * 2013-12-17 2015-06-17 德国捷德有限公司 排水筛网和排水筛网的制造方法

Also Published As

Publication number Publication date
WO2007028485A8 (fr) 2010-07-29
PL1937893T3 (pl) 2011-04-29
EP1937893A2 (fr) 2008-07-02
WO2007028485A3 (fr) 2007-05-31
DE102005042344A1 (de) 2007-03-08
ATE486998T1 (de) 2010-11-15
DE502006008248D1 (de) 2010-12-16
SI1937893T1 (sl) 2011-02-28
ES2353817T3 (es) 2011-03-07
WO2007028485A2 (fr) 2007-03-15

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