EP2886712B1 - Crible d'égouttage et son procédé de fabrication - Google Patents

Crible d'égouttage et son procédé de fabrication Download PDF

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Publication number
EP2886712B1
EP2886712B1 EP14004227.6A EP14004227A EP2886712B1 EP 2886712 B1 EP2886712 B1 EP 2886712B1 EP 14004227 A EP14004227 A EP 14004227A EP 2886712 B1 EP2886712 B1 EP 2886712B1
Authority
EP
European Patent Office
Prior art keywords
watermark
screen
contour
watermark insert
cut
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
EP14004227.6A
Other languages
German (de)
English (en)
Other versions
EP2886712A1 (fr
Inventor
André Gregarek
Andreas Aigner
Andreas HÄNELT
Georg Kiefersauer
Bernhard Wiedner
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 EP2886712A1 publication Critical patent/EP2886712A1/fr
Application granted granted Critical
Publication of EP2886712B1 publication Critical patent/EP2886712B1/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
    • D21F1/10—Wire-cloths
    • 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

Definitions

  • the invention relates to a dewatering screen for the production of paper with multi-level watermark, with a carrier screen which has a multi-level relief in the form of the watermark to be generated in a partial area.
  • 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.
  • the contours of the cut-out area and the watermark insert are parallel to each other with the contour of the cut-out area extending within the contour of the watermark insert.
  • the insert is perforated prior to introduction into the sieve, which, however, has the consequence that the gluing and welding in some perforations are closed again and also the sieve tissue perforation holes overlaps and thus makes impermeable.
  • the watermark insert is first injected and later perforated, this is not a problem outside of the overlap area.
  • the laser radiation hits in the overlap area on a wire, no perforation can be done here and thus a dewatering in papermaking.
  • This poorly perforated overlap area is later visible in the finished paper as a lighter, thicker and thus unwanted edge in the watermark.
  • the present invention seeks to provide a Enticass mecanicssieb of the aforementioned type, which avoids the disadvantages of the prior art.
  • the dewatering screen should have a stable bond between the watermark insert and the carrier screen, allow the production of paper with multi-level watermark high detail and at the same time reduce or avoid the unwanted edge formation.
  • dewatering screen having the features of the independent claims.
  • a method for producing dewatering screens according to the invention, a method for producing a paper, a security paper and a value document with multistage watermarks are specified in the independent claims. Further developments of the invention are the subject of the dependent claims.
  • the multi-level relief is formed by an injection-molded, perforated watermark insert which is arranged in a cut-out region of the carrier screen and is connected to it only in its edge region, the contour of the watermark insert having the contour of the support screen overlaps at least partially and the overlap of watermark insert and cut-out area is different degrees.
  • a different degree of overlap means that the watermark insert and the carrier screen overlap with different widths in their edge regions.
  • the combination of watermark insert and carrier screen according to the invention permits the use of injection-molded multistage watermark inserts with extremely detailed relief representations with concurrent lamination of the hitherto undesired edges in the finished paper. At the same time, a stable bond between the watermark insert and the carrier screen is created, which allows a long and thus economical use of the screen in production.
  • the combination of watermark insert according to the invention with the carrier screen allows a significantly reduced overlap with the prior art while at the same time a solid bond between carrier screen and watermark insert.
  • a lower overlap related to the area results in having to perforate a smaller area and thus achieving improved overall drainage in papermaking, particularly at the screen-watermark liner transition. Undesired edges in the paper are thus reduced or completely avoided.
  • the watermark insert is welded or glued to the carrier screen.
  • the watermark insert is injected directly into the carrier screen.
  • the contour of the cut-out area is linear, serrated, wavy, and / or step-shaped, preferably jagged.
  • the contour of the watermark insert is linear, serrated, wavy, and / or stepped, preferably linear.
  • the tines, undulations and / or steps preferably have a period of 0.01 mm to 5 mm, preferably 0.1 mm to 3 mm, particularly preferably 0.2 mm to 0.5 mm.
  • the tines, waves and / or steps preferably have an amplitude of 0.05 mm to 5 mm, preferably 0.1 mm to 3 mm, particularly preferably from 0.1 mm to 0.5 mm.
  • the contour of the cut-out region of the carrier screen preferably runs completely within the contour of the watermark insert, so that the carrier screen and watermark insert completely overlap in their edge regions.
  • the contour of the cut-out portion of the carrier wire is not partially within the contour of the watermark insert, so that the carrier screen and watermark insert partially overlap in their edge regions and partially the contour of the cut-out portion of the carrier screen is in shock or in abutment with the contour of the watermark insert or spaced therefrom.
  • the carrier screen and watermark insert overlap at the location of the least overlap, preferably less than 0.3 mm, particularly preferably less than 0.2 mm, very particularly preferably less than 0.1 mm.
  • the overlap of carrier wire and watermark insert is preferably at most up to 1 mm, particularly preferably at most 0.5 mm.
  • the period of the tines, waves and / or steps depends on the size and shape of the watermark insert and on the expected load on the finished carrier screen. The larger the watermark insert and the more irregular the shape of its outer border, the lower the period is chosen.
  • the contours of the watermark insert and the carrier screen are preferably designed in the form of a motif or a pattern.
  • the carrier screen advantageously has a screen fabric with at least one system of interwoven, longitudinally running warp threads and weft threads extending transversely thereto.
  • usable carrier screens are in the WO 2008/071325 A1 are disclosed and incorporated in the disclosure of the present patent.
  • the screen fabric contains a metal fabric, in particular a bronze fabric.
  • the cut-out edge region of the screen fabric of the carrier screen is preferably squeezed and sealed in an injection molding tool, and the plastic is then injected into the sealed injection molding tool with the carrier screen.
  • the hot runner technique is used as injection molding.
  • the applicable injection molding technology is used in the WO 2008/071325 A1 and incorporated in the disclosure of the present application.
  • the invention further includes a method for producing a paper, in particular a security paper, with a multi-level watermark, in which the paper attachment takes place on one of the above-described dewatering screens with injection-molded watermark inserts.
  • the security paper or the document of value in the area of the multi-level watermark can be used with a transparent, preferably to provide stabilizing film.
  • a multi-level watermark can be arranged in the region of a covering film of a banknote with a through opening and stabilized by the covering film.
  • the film may be provided with security elements, such as diffractive structures, liquid crystal layers, thin-film structures, fluorescent substances, magnetic, conductive and / or metallic layers.
  • Fig. 1 shows a schematic representation of a banknote 10, the multi-level watermark 12 high detail sharpness in the form of an in Fig. 1 contains only suggested portraits.
  • the production of banknotes with such detail-sharp, multi-level watermarks is carried out according to the invention using one of the following described drainage sieves with injection-molded watermark inserts.
  • Fig. 2 shows a cut out in the watermark insert carrier screen with directly injected watermark insert in supervision.
  • a specially adapted injection mold as in the WO 2008/071325 A1 described used, in which the mesh of the support wire 20 is squeezed and sealed for the injection process along a sealing edge. The liquid plastic can then not escape laterally during injection molding.
  • the screen is cut out and the sealing edge is arranged so that the contour of the watermark insert overlaps at least partially with the contour of the carrier screen, and the overlap of the watermark insert and the cut-out area is different.
  • FIG. 4 The overlap 23 according to the prior art is shown schematically in FIG Fig. 4 shown.
  • An inventive embodiment with varying degrees of overlap is in the Fig. 5a to 5c shown schematically.
  • the integrated watermark insert 22 is provided with dehydration perforations 40 by means of a laser beam, as described above.
  • Fig. 3 shows in cross-section the cut-out carrier screen 20 with injected watermark insert 22, which is already provided with perforations 40.
  • the watermark insert and the carrier screen overlap (overlap 23).
  • Fig. 4 shows in plan view a section of a support screen with watermark insert according to the prior art.
  • the (only partially shown) carrier screen 20 is cut out in a circle.
  • the watermark insert 22 has been injected into this cut-out and has a circular contour, so that the circular cut-out region of the carrier screen and the watermark insert are arranged concentrically.
  • area 23 overlap wire and watermark insert with substantially constant width D.
  • FIG. 5a to Fig. 5d an embodiment of a mesh according to the invention with watermark insert and varying degrees of overlap is shown.
  • Fig. 5a shows a plan view of a section of a support wire 20 with a cut-out area 24 in star shape.
  • the contour of the cut-out area is jagged.
  • the spikes are arranged here regularly. Of course, irregular arrangements are possible, both in terms of period and amplitude.
  • Fig. 5b shows in plan view a watermark insert 22 in a circular shape.
  • the contour of the watermark insert is linear.
  • This watermark insert is arranged in the region of the cut-out region of the carrier screen and connected thereto.
  • the insert is injected directly into the cut-out area by means of injection molding and then perforated.
  • Fig. 5c shows a section of the support according to the invention, the by the combination of the support wire 20 from Fig. 5a with the watermark insert 22 off Fig. 5b originated.
  • the watermark insert completely overlaps the carrier screen in the edge regions, wherein the overlap 23 does not have a constant width but is of different strength.
  • Fig. 5d shows an enlargement of the screen 20 Fig. 5c with the focus on the region of the overlap 23.
  • the jagged contour of the cut-out region 24 results in an overlap 23 of watermark insert 22 and cut-out region, which has different strengths.
  • the maximum overlap has a width d2, the minimum overlap a width d1.

Landscapes

  • Paper (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Claims (13)

  1. Tamis d'égouttage destiné à la fabrication de papier doté d'un filigrane à plusieurs niveaux, comprenant un tamis support présentant dans une zone partielle un relief à plusieurs niveaux de la forme du filigrane à générer, le relief à plusieurs niveaux étant constitué par un insert à filigrane perforé moulé par injection qui est agencé dans une zone découpée du tamis support et n'est rattaché à cette dernière qu'en sa zone de bordure, le contour de l'insert à filigrane se chevauchant au moins partiellement avec le contour du tamis support, caractérisé en ce que le chevauchement de l'insert à filigrane et de la zone découpée a des ampleurs différentes.
  2. Tamis d'égouttage selon la revendication 1, caractérisé en ce que le contour de la zone découpée du tamis support se trouve entièrement à l'intérieur du contour de l'insert à filigrane, de telle sorte que le tamis support et l'insert à filigrane se chevauchent entièrement dans leurs zones de bordure.
  3. Tamis d'égouttage selon la revendication 1 ou 2, caractérisé en ce que le contour de la zone découpée est linéaire, dentelé, ondulé et/ou en gradins, de préférence dentelé.
  4. Tamis d'égouttage selon au moins une des revendications de 1 à 3, caractérisé en ce que le contour de l'insert à filigrane est linéaire, dentelé, ondulé et/ou en gradins, de préférence linéaire.
  5. Tamis d'égouttage selon la revendication 3 ou 4, caractérisé en ce que les dentelures, ondes et/ou gradins présentent une période située entre 0,01 mm et 5 mm, de préférence entre 0,1 mm et 3 mm, particulièrement de préférence entre 0,2 mm et 0,5 mm.
  6. Tamis d'égouttage selon au moins une des revendications 1, 3 à 5, caractérisé en ce que le contour de la zone découpée du tamis support ne se trouve partiellement pas à l'intérieur du contour de l'insert à filigrane, de telle sorte que le tamis support et l'insert à filigrane se chevauchent partiellement dans leurs zones de bordure et que, partiellement, le contour de la zone découpée du tamis support se trouve bord à bord avec le contour de l'insert à filigrane ou est espacé de ce dernier.
  7. Tamis d'égouttage selon au moins une des revendications 1 à 6, caractérisé en ce que, à l'endroit de leur chevauchement le plus faible, le tamis support et l'insert à filigrane se chevauchent de moins de 0,3 mm, de préférence de moins de 0,2 mm, particulièrement de préférence de moins de 0,1 mm.
  8. Tamis d'égouttage selon au moins une des revendications 1 à 7, caractérisé en ce que l'insert à filigrane est soudé ou collé au tamis support.
  9. Tamis d'égouttage selon au moins une des revendications 1 à 7, caractérisé en ce que l'insert à filigrane est injecté directement dans le tamis support.
  10. Tamis d'égouttage selon au moins une des revendications 1 à 9, caractérisé en ce que le tissu de tamisage est un tissu métallique, en particulier un tissu de bronze.
  11. Procédé de fabrication d'un tamis d'égouttage destiné à la fabrication de papier doté de filigranes à plusieurs niveaux, dans lequel
    a) un tamis support comportant une zone découpée est mis à disposition,
    b) un insert séparé à filigrane ayant un relief à plusieurs niveaux de la forme du filigrane à générer est fabriqué par procédé de moulage par injection et est perforé, et
    c) l'insert à filigrane est agencé dans la zone découpée et n'est rattaché à cette dernière qu'en sa zone de bordure, en particulier soudé ou collé, caractérisé en ce que le contour de l'insert à filigrane se chevauche au moins partiellement avec le contour du tamis support et en ce que le chevauchement de l'insert à filigrane et de la zone découpée a des ampleurs différentes.
  12. Procédé de fabrication d'un tamis d'égouttage destiné à la fabrication de papier doté de filigranes à plusieurs niveaux, dans lequel
    a) un tamis support est mis à disposition,
    b) le tamis support est découpé dans la zone du filigrane,
    c) un insert à filigrane ayant un relief à plusieurs niveaux de la forme du filigrane à générer est injecté de telle manière par procédé de moulage par injection dans le tamis support que le contour de l'insert à filigrane se chevauche au moins partiellement avec le contour du tamis support et que le chevauchement de l'insert à filigrane et de la zone découpée a des ampleurs différentes, et
    d) l'insert à filigrane intégré dans le tamis support est perforé.
  13. Procédé de fabrication d'un papier, en particulier d'un papier de sécurité, doté d'un filigrane à plusieurs niveaux, dans lequel le piégeage de papier a lieu sur un tamis d'égouttage selon au moins une des revendications 1 à 10.
EP14004227.6A 2013-12-17 2014-12-15 Crible d'égouttage et son procédé de fabrication Not-in-force EP2886712B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102013021179.4A DE102013021179A1 (de) 2013-12-17 2013-12-17 Entwässerungssieb und Verfahren zu seiner Herstellung

Publications (2)

Publication Number Publication Date
EP2886712A1 EP2886712A1 (fr) 2015-06-24
EP2886712B1 true EP2886712B1 (fr) 2017-05-03

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ID=52278329

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Application Number Title Priority Date Filing Date
EP14004227.6A Not-in-force EP2886712B1 (fr) 2013-12-17 2014-12-15 Crible d'égouttage et son procédé de fabrication

Country Status (4)

Country Link
EP (1) EP2886712B1 (fr)
CN (1) CN104711889B (fr)
DE (1) DE102013021179A1 (fr)
ES (1) ES2634012T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016012464A1 (de) * 2016-10-19 2018-04-19 Giesecke+Devrient Currency Technology Gmbh Anordnung und Verfahren zum Ausstatten eines Entwässerungssiebs mit perforierten Wasserzeicheneinsätzen

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006022059A1 (de) * 2005-06-21 2006-12-28 Giesecke & Devrient Gmbh Entwässerungssieb und Verfahren zu seiner Herstellung
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
DE102011116605A1 (de) * 2011-10-21 2013-04-25 Giesecke & Devrient Gmbh Entwässerungssieb
CN103015248B (zh) * 2013-01-10 2015-03-18 保定钞票纸业有限公司 一种含有亮窗水印的防伪纸及其制造方法

Also Published As

Publication number Publication date
CN104711889A (zh) 2015-06-17
ES2634012T3 (es) 2017-09-26
CN104711889B (zh) 2017-03-29
DE102013021179A1 (de) 2015-06-18
EP2886712A1 (fr) 2015-06-24

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