EP2899314B1 - Toile d'égouttage pour la fabrication de papier doté d'un filigrane et procédé de fabrication de ladite toile - Google Patents

Toile d'égouttage pour la fabrication de papier doté d'un filigrane et procédé de fabrication de ladite toile Download PDF

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Publication number
EP2899314B1
EP2899314B1 EP15000244.2A EP15000244A EP2899314B1 EP 2899314 B1 EP2899314 B1 EP 2899314B1 EP 15000244 A EP15000244 A EP 15000244A EP 2899314 B1 EP2899314 B1 EP 2899314B1
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EP
European Patent Office
Prior art keywords
watermark
elements
motif
dewatering screen
filigree
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.)
Active
Application number
EP15000244.2A
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German (de)
English (en)
Other versions
EP2899314A1 (fr
Inventor
Marion Fessl
Thomas Gerhardt
Kathrin Hovestadt
Matthias Dr. Pfeiffer
Wolfram Dr. Seidemann
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
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Giesecke and Devrient Currency Technology GmbH
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Priority to PL15000244T priority Critical patent/PL2899314T3/pl
Publication of EP2899314A1 publication Critical patent/EP2899314A1/fr
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Publication of EP2899314B1 publication Critical patent/EP2899314B1/fr
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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

Definitions

  • the invention relates to a dewatering screen for the production of paper with a watermark, and to a method for producing such a dewatering screen.
  • Watermark paper can be equipped with two-level watermarks with a strong light-dark effect as well as with multi-level watermarks with smooth transitions between light and dark and detailed representation of a subject.
  • multi-level watermarks for example, a desired three-dimensional relief is embossed in a metal drainage screen. The paper thickness of the finished paper then varies according to the embossed relief and allows the transmission of soft, gradual transitions between lighter and darker areas.
  • the WO 2013/140126 A1 relates to electrootypes for imaging during papermaking.
  • a composite sieve-type electrophototype is proposed in which the desired electrotype elements are connected to a fine mesh whose size is chosen is that the screen structure in the finished paper is not visible to the naked eye.
  • the WO 2008/071325 A1 relates to a dewatering screen for the production of paper with multilevel watermark, with a support screen, which has a multi-level relief in the form of the watermark to be generated in a partial area.
  • the multi-level relief is formed by an injection-molded, perforated watermark insert.
  • pamphlets GB 2149 827 A DE 100 64 006 A1 .
  • WO 2012/013809 A1 and US 1 571 715 A concern the production of watermarked paper.
  • the object of the invention is to provide a dewatering screen for the production of paper with a watermark, which combines an attractive visual appearance with high security against counterfeiting.
  • the invention includes a dewatering screen of the type mentioned with a support screen, which has a watermark insert with a relief in the form of the watermark to be generated in a partial area.
  • the relief has a plurality of filigree elements, which in the context of this description are to be understood to mean punctiform and / or linear motif elements having a stroke width of 0.4 mm or less.
  • the filigree elements are formed as elevations or depressions with a constant height level.
  • the relief contains in addition to the filigree elements additionally raised or recessed motif elements in the form of patterns, characters or a coding with a stroke width of more than 0.8 mm and a constant height level.
  • the filigree elements form border lines for the mentioned additional motif elements, and indeed the filigree elements in the case of raised motif elements form recessed border lines and, in the case of recessed motif elements, raised border lines.
  • the filigree elements enhance the contrast of the watermarks generated by the additional motif elements, thereby resulting in a more accentuated appearance, increased perceptibility, and better visibility. If the additional motif elements represent a character string, the contrasting, sharp outline lines of the filigree elements also lead to improved legibility of the character string.
  • the border lines run completely along the outline of the motif elements.
  • the border lines extend only on one side of the outline of the motif elements.
  • the phrase "only on one side of the outline" includes in particular the variants that the border lines only on the upper right side, on the upper side, on the upper left side, on the left side, on the lower left side, on the lower side, on the lower right side or on the right side of the outline are provided.
  • the filigree elements create the impression of a shadow cast or a three-dimensional motif that extends backwards in the perspective.
  • the watermark to be generated contains a spatial image motif with flat front surfaces and side surfaces extending in perspective into the depth.
  • the relief has additional motif elements with a constant height level in the form of said front surfaces, and the filigree elements form a preferably oblique hatching in the form of said side surfaces.
  • the front surfaces and the hatched side surfaces thus form a deep-extending extrusion representation with a three-dimensional appearance.
  • the filigree elements form a one-dimensional or two-dimensional barcode. If the filigree elements are formed by elevations, the barcode appears bright against the background of the surrounding banknote paper, while it appears dark in the case of filigree elements formed by depressions.
  • the filigree elements form a lettering or a guilloche pattern without, as is usually unavoidable in conventional designs, connecting webs between Parts of the logo would be visible. Even in these embodiments, the lettering or the guilloche pattern against the background of the banknote paper may appear light or dark, depending on whether the filigree elements are in the form of elevations or depressions.
  • filigree elements according to still another, also advantageous embodiment form dotted or dashed lines representing a graphic motif or a string.
  • Such dotted or dashed designs can not be realized with conventional technology and have a high recognition value due to their memorable appearance.
  • the watermark insert is an injection-molded insert.
  • the injection molding insert is expediently formed from a hydrophobic plastic, for example from polyoxymethylene.
  • the plastic may be added with wear-reducing additives.
  • a separate watermark insert can be produced and perforated, and the separately produced watermark insert can then be connected, in particular welded or glued, to the carrier screen. Finally, the watermark insert can be injected with a corresponding tool shape directly into a cut-out portion of the mesh, so that a particularly intimate connection with the mesh arises.
  • the dewatering screen may also have a plastic overmold or plastic backshell that connects the watermark insert to the carrier screen.
  • the watermark insert is preferably arranged in a cut-out region of the carrier screen and connected thereto only in a preferably serrated edge region.
  • a recesses are generated which is slightly smaller, for example, 1/10 mm smaller than the desired shape of the watermark insert.
  • the edge region can be designed in particular in the form of a pattern, preferably in a serrated form. In this cut-out portion of the watermark insert can be inserted or preferably injected, as described above.
  • the support screen advantageously comprises a screen fabric with at least one system of interwoven, longitudinally extending warp threads and weft threads running transversely thereto, the screen fabric advantageously comprising either a metal fabric, in particular a bronze fabric, a metal-plastic mixed fabric, in particular a bronze plastic Contains mixed tissue or a pure plastic fabric.
  • the watermark insert preferably has a plurality of perforations that ensure dewatering in papermaking.
  • the dimensions of these drainage perforations are chosen so small that they do not adhere to fibers during papermaking.
  • Typical perforation diameters are between 100 ⁇ m and a few 100 ⁇ m, for example about 500 ⁇ m.
  • the perforations preferably taper towards the upper design surface of the watermark insert.
  • the carrier screen is cut out in the region of the watermark to be generated, and the watermark insert is injected in the cut-out region of the carrier screen.
  • the watermark insert can also be manufactured and perforated as a separate watermark insert, and welded or glued to the carrier screen.
  • FIG. 1 and 2 show in a schematic representation of a banknote 10, in the paper substrate 12 two watermarks 14, 24 were introduced with filigree border lines 16, 26.
  • Fig. 1 shows that Appearance of the banknote in transmitted light
  • Fig. 2 shows in two sections a cross section through the banknote in the region of the watermarks 14, 24 along the line II-II of Fig. 1 ,
  • banknote paper in the unprinted areas When viewed in transmitted light, for example, against daylight or a bright lamp, banknote paper in the unprinted areas is not completely opaque, but somewhat translucent and appears with a specific gray value, which in Fig. 1 is indicated by a hatch of medium density.
  • the first watermark 14 is designed in the manner of a highlight watermark, in which a motif 18 in the form of patterns, characters or a coding appears bright against the background of the surrounding banknote paper 12.
  • the motif 18 is formed by the number sequence "10", which is designed with a stroke width of 1.0 mm.
  • the motif 18 is continuously surrounded by a fine borderline 16 with a width of only 0.25 mm, which appears darker in transmitted light than the surrounding banknote paper and therefore forms a strong contrast with the bright digit sequence "10".
  • the left part of the Fig. 2 a cross section through the banknote paper in the area of the numeral "1" of the first watermark 14.
  • the nominal thickness of the banknote paper 12 outside the watermark is denoted by S 0 .
  • S H the nominal thickness of the banknote paper 12 outside the watermark.
  • the paper thickness is reduced to a lower value S H ⁇ S 0 and produces a very light gray value when viewed through.
  • the paper thickness is increased with respect to the target thickness to a larger value S D > S 0 , so that the border line 16 appears darker in transmitted light than the average gray value of the banknote paper, and the total in Fig. 1 shown appearance arises.
  • the second watermark 24 is designed in the manner of an inverted highlight watermark, in which a motif 28 in the form of patterns, characters or an encoding appears dark against the background of the surrounding banknote paper 12.
  • the motif 28, like the motif 18, is formed by the number sequence "10" with a stroke width of 1.0 mm.
  • the motif 28 is surrounded by a fine border line 26 with a stroke width of only 0.25 mm, which appears brighter in transmitted light than the surrounding banknote paper and therefore forms a strong contrast with the dark number sequence "10".
  • the paper thickness is increased to a larger value S D > S 0 and produces a dark gray value when viewed through the cover.
  • the paper thickness is reduced compared to the desired thickness to a smaller value S H ⁇ S 0 , so that the border line 26 appears brighter in transmitted light than the average gray value of the banknote paper, and the total in Fig. 1 shown appearance arises.
  • the dewatering screen 40 comprises a carrier screen 42 with a screen fabric 44, which is cut out in a partial region 50.
  • the height level of the paper facing surface of the support wire is in Fig. 3 indicated by the reference numeral 52.
  • paper is deposited on the screen fabric 44, the nominal thickness of which, after drying, is S 0 (FIG. Fig. 2 ) referred to as.
  • the screen fabric 44 has at least one system of interwoven, longitudinally extending warp threads 46 and weft threads 48 extending transversely thereto.
  • the screen fabric may for example contain a metal fabric, in particular a bronze fabric, a metal-plastic mixed fabric, in particular a bronze-plastic mixed fabric, or even a pure plastic fabric.
  • the support screen 42 may include both a single-layer and a multi-layer mesh, with the simpler view being shown in the figures only single-layer mesh.
  • a plastic watermark insert 60 is arranged, which is connected at its edge to the mesh fabric 44.
  • the connection can in principle be made in many ways, for example by a plastic encapsulation or back injection, with the aid of a plurality along the edge arranged fastening knobs, or by welding or gluing.
  • plastic watermark insert 60 is an injection-molded element which is injected directly into the cut-out portion 50 of the screen fabric 44 with a corresponding tool shape and thereby enters into a particularly intimate connection with the screen fabric.
  • the injection-molded watermark insert 60 has a relief 62 in the form of the watermarks 14, 24 to be produced and contains in a partial region 64 raised motif elements 68 in the form of the numbers "1" and "0".
  • the motif elements 68 have a stroke width of 1.0 mm and a constant height level above the sieve surface 52.
  • Further filigree elements 66 are provided in the partial area 64, which extend in the form of recessed border lines with a stroke width of only 0.25 mm along the entire outline of the motif elements 68 around them.
  • the height level of the filigree elements 66 lies below the screen surface 52, so that the motif elements 68 produce comparatively large-area regions 18 of reduced paper thickness S H ⁇ S 0 during papermaking, while the filigree elements 66 produce circumferential narrow regions 16 of increased paper thickness S D > S 0 .
  • the relief 62 contains in a further portion 74 recessed motif elements 78, which are also in the form of the numbers “1" and "0".
  • the motif elements 78 have a stroke width of 1.0 mm and a constant height level below the sieve surface 52.
  • filigree elements 76 are provided in the partial area 74, which extend in the form of raised border lines with a line width of only 0.25 mm along the entire outline of the motif elements 78 around them.
  • the height level of the filigree elements 76 lies above the screen surface 52, so that the motif elements 78 produce relatively large-area regions 28 of increased paper thickness S D > S 0 during papermaking, while the filigree elements 76 produce circumferential narrow regions 26 of reduced paper thickness S H ⁇ S 0 .
  • the watermark insert 60 is further provided with a plurality of only indicated in the figure perforations 58 to ensure drainage in papermaking also in the field of watermark insert.
  • the diameter of the perforations 58 is chosen so small that in they do not adhere to fibers during papermaking. Typical perforation diameters are between 100 ⁇ m and a few 100 ⁇ m, for example about 500 ⁇ m.
  • the filigree elements 66, 76 each run completely along the outline of the numbers "1" and "0", which form the additional motif elements 68 and 78, respectively.
  • the border lines formed by the filigree elements can also extend only on one side of the outline of the additional motif elements in order to generate a spatial image impression in the watermark.
  • Fig. 4 illustrated similar to Fig. 1 shows a watermark 30 in the manner of a highlight watermark, in which the motif 18 is formed in the form of the number sequence "10" with a stroke width of 1.0 mm.
  • filigree elements are provided with a stroke width of 0.4 mm in the form of recessed border lines on one side of the associated raised motif elements, right in the embodiment above, which appear darker than the surrounding banknote paper in transmitted light and so a shadow 32 through the Simulate the digit sequence "10".
  • a spatial image impression can also occur in the reverse contrast distribution, ie a dark motif and bright filigree border lines, as this creates the impression of a running backwards three-dimensional motif.
  • the watermark 80 of the in Fig. 5 illustrated embodiment creates a spatial impression.
  • the watermark 80 shows the letter sequence "PL" with planar front surfaces 82 and perspective depth extending side surfaces 84 in the manner of an extrusion representation.
  • motif elements of constant height in the form of the front surfaces 82 are provided on the one hand and on the other hand, a plurality of filigree elements in the form of parallel fine lines of a stroke width of 0.3 mm, which form an oblique hatching 86 in the form of the side surfaces 84.
  • the motif represented by the front surfaces 82 appears in this way with a three-dimensional image impression.
  • Fig. 6 shows two watermarks 90, 92 in a banknote paper 12, which are formed in the form of filigree barcodes with bar widths of 0.4 mm or less.
  • the barcode of the watermark 90 is thereby generated by filigree elements in the form of recessed lines with a constant height level in the associated watermark insert and therefore appears darker in transmitted light than the surrounding banknote paper 12.
  • the barcode of the watermark 92 is characterized by filigree elements in the form of raised lines with a constant height level associated Watermark insert generates and appears in transmitted light brighter than the surrounding banknote paper 12th
  • the particularly narrow filigree elements of the present invention allow a number of other designs that can not be realized in this form in conventional round watermark or electrotype watermarks.
  • the embodiment of the Fig. 7 (a) a watermark 94 in the form of the continuous lettering "filigree" with a stroke width of only 0.4 mm, without that, as typically in electrotype watermarks, connecting webs between the parts of the lettering would be necessary or visible.
  • the lettering can, depending on whether the filigree elements are in the form of raised or recessed lines, appear light or dark against the background of the banknote paper 12.
  • the filigree elements are formed in the form of dashed raised or recessed lines and thereby generate as watermark 96 a motif, here for example a portrait, which appears in a characteristic dotted or dashed manner.
  • a motif here for example a portrait
  • Such designs can not be realized with conventional electrotypes watermarks and have by their memorable appearance on a high counterfeit security.
  • Fig. 7 (c) finally shows a watermark 98 in the form of guilloches.
  • guilloche patterns can not be created as watermarks with conventional technology, but often appear as printed patterns on banknotes or other securities.
  • Guilloche watermarks on the one hand, are visually appealing, familiar to the observer as authenticity features and difficult to reproduce due to their complex production.

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  • Paper (AREA)
  • Credit Cards Or The Like (AREA)
  • Printing Methods (AREA)

Claims (15)

  1. Toile d'égouttage (40) pour la fabrication de papier doté d'un filigrane, comportant une toile support (42) qui présente dans une sous-partie un insert de filigrane (60) doté d'un relief (62) sous forme d'un filigrane à réaliser, le relief (62) présentant une pluralité d'éléments de filigrane (66, 76) sous forme d'éléments à motif ponctuel et/ou linéaire d'une largeur de trait de 0,4 mm ou moins, caractérisée en ce que l'insert de filigrane (60) est un insert moulé par injection.
  2. Toile d'égouttage (40) selon la revendication 1, caractérisée en ce que les éléments de filigrane sont réalisés sous forme de proéminences (76) ou de creux (66) d'un niveau de hauteur constant.
  3. Toile d'égouttage (40) selon la revendication 1 ou 2, caractérisée en ce que le relief contient, outre les éléments de filigrane (66, 76), des éléments de motif (68, 78) surélevés ou creusés caractérisés par une largeur de trait sous la forme de dessins, de caractères ou d'un codage d'une largeur de trait de plus de 0,8 mm et d'un niveau de hauteur constant, et que les éléments de filigrane (66, 76) constituent des lignes d'encadrement creusées ou proéminentes pour les éléments de motifs cités (68, 78).
  4. Toile d'égouttage (40) selon la revendication 3, caractérisée en ce que les lignes d'encadrement sont orientées entièrement le long du contour des éléments de motif (68, 78).
  5. Toile d'égouttage (40) selon la revendication 3, caractérisée en ce que les lignes d'encadrement sont orientées seulement sur un côté du contour des éléments de motifs (68, 78) pour créer une impression graphique spatiale dans le filigrane.
  6. Toile d'égouttage (40) selon la revendication 1 ou 2, caractérisée en ce que le filigrane (80) contient un motif graphique spatial avec des surfaces avant planes (82) et des surfaces latérales (84) s'étendant en perspective en profondeur, que le relief destiné à la réalisation du motif graphique spatial présente des éléments de motif supplémentaires d'un niveau de hauteur constant sous forme des surfaces avant indiquées (82), et que les éléments de filigrane présentent un hachurage sous forme des surfaces latérales indiquées (84).
  7. Toile d'égouttage (40) selon la revendication 1 ou 2, caractérisée en ce que les éléments de filigrane constituent un code barre uni- ou bidimensionnel.
  8. Toile d'égouttage (40) selon la revendication 1 ou 2, caractérisée en ce que les éléments de filigrane (66, 76) constituent une inscription ou un motif guilloché.
  9. Toile d'égouttage (40) selon la revendication 1 ou 2, caractérisée en ce que les éléments de filigrane (66, 76) constituent des lignes pointillées ou hachurées qui représentent un motif graphique ou une série de caractères.
  10. Toile d'égouttage (40) selon au moins une des revendications 1 à 9, caractérisée en ce que la toile d'égouttage (40) présente une injection périphérique en plastique ou une injection arrière en plastique qui connecte l'insert de filigrane (60) à la toile support (42) .
  11. Toile d'égouttage (40) selon au moins une des revendications 1 à 10, caractérisée en ce que l'insert de filigrane (60) est disposé dans une partie découpée (50) de la toile support (42) et n'est connecté à celle-ci que dans une zone périphérique de préférence dentelée.
  12. Toile d'égouttage (40) selon au moins une des revendications 1 à 11, caractérisée en ce que la toile support (42) présente un textile de toile (44) comportant chacun au moins un système de fils de chaîne (46) tissés entre eux et s'étendant dans le sens longitudinal et des fils de trame (48) s'étendant transversalement à ceux-ci, le textile de toile (44) contenant avantageusement soit un treillis métallique, en particulier un treillis de bronze, un treillis mélangé de métal et plastique, en particulier un treillis mélangé de bronze et plastique ou un treillis purement en plastique.
  13. Toile d'égouttage (40) selon au moins une des revendications 1 à 12, caractérisée en ce que l'insert de filigrane (60) présente une pluralité de perforations (58) dont les dimensions sont assez réduites pour qu'aucune fibre n'adhère à l'intérieur lors de la fabrication du papier.
  14. Procédé de réalisation d'un filigrane (40) pour la fabrication de papier doté d'un filigrane, dans lequel
    - une toile support (42) est mise à disposition,
    - un insert de filigrane (60) doté d'un relief (62) sous forme du filigrane à réaliser est injecté par procédé de moulage par injection dans la toile support (42), le relief (62) étant réalisé avec une pluralité d'éléments de filigrane (66, 76) sous forme d'éléments de motifs de forme ponctuelle et/ou linéaire d'une largeur de trait de 0,4 mm ou moins, et
    - l'insert de filigrane (60) est pourvu de perforations d'égouttage (58) par l'action d'un rayonnement laser.
  15. Procédé selon la revendication 14, caractérisé en ce que la toile support (42) est découpée au niveau du filigrane à réaliser, et le filigrane (60) est injecté dans la partie découpée (50) de la toile support.
EP15000244.2A 2014-01-28 2015-01-27 Toile d'égouttage pour la fabrication de papier doté d'un filigrane et procédé de fabrication de ladite toile Active EP2899314B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL15000244T PL2899314T3 (pl) 2014-01-28 2015-01-27 Sito odwadniające do wytwarzania papieru zawierającego znak wodny i sposób wytwarzania wspomnianego sita

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014001065.1A DE102014001065A1 (de) 2014-01-28 2014-01-28 Entwässerungssieb für die Herstellung von Papier mit einem Wasserzeichen

Publications (2)

Publication Number Publication Date
EP2899314A1 EP2899314A1 (fr) 2015-07-29
EP2899314B1 true EP2899314B1 (fr) 2018-12-12

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EP15000244.2A Active EP2899314B1 (fr) 2014-01-28 2015-01-27 Toile d'égouttage pour la fabrication de papier doté d'un filigrane et procédé de fabrication de ladite toile

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Country Link
EP (1) EP2899314B1 (fr)
DE (1) DE102014001065A1 (fr)
ES (1) ES2719998T3 (fr)
PL (1) PL2899314T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018004995A1 (de) 2018-06-22 2019-12-24 Giesecke+Devrient Currency Technology Gmbh Sicherheitspapierbahn mit Wasserzeichen und Entwässerungssieb zur Herstellung von Wasserzeichenpapier

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1571715A (en) * 1925-11-11 1926-02-02 Int Paper Co Method of and means for forming watermarks in paper
US4526652A (en) * 1983-11-17 1985-07-02 The Mead Corporation Dandy roll for manufacturing paper having simulated oxford cloth watermark and related method for papermaking
DE10064006A1 (de) * 2000-12-21 2002-07-04 Giesecke & Devrient Gmbh Wasserzeichenform für die Papierherstellung und Verfahren zur Applizierung derselben auf einem Schöpfsieb
DE102006058513A1 (de) * 2006-12-12 2008-06-19 Giesecke & Devrient Gmbh Entwässerungssieb und Verfahren zu seiner Herstellung
FR2963363B1 (fr) * 2010-07-30 2014-12-26 Banque De France Toile poreuse pour la fabrication d'un papier filigrane, papier filigrane et procede de fabrication d'une telle toile
KR101616573B1 (ko) * 2012-03-19 2016-04-28 드 라 뤼 인터내셔날 리미티드 종이 제조 공정 동안 이미지를 형성하기 위한 전기판

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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DE102014001065A1 (de) 2015-07-30
ES2719998T3 (es) 2019-07-17
PL2899314T3 (pl) 2019-11-29
EP2899314A1 (fr) 2015-07-29

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