EP2899312A1 - Toile d'égouttage pour la fabrication de papier doté d'un filigrane à deux tons et procédé de fabrication de ladite toile - Google Patents

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

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Publication number
EP2899312A1
EP2899312A1 EP15000242.6A EP15000242A EP2899312A1 EP 2899312 A1 EP2899312 A1 EP 2899312A1 EP 15000242 A EP15000242 A EP 15000242A EP 2899312 A1 EP2899312 A1 EP 2899312A1
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EP
European Patent Office
Prior art keywords
motif
watermark
elements
motive
component
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.)
Granted
Application number
EP15000242.6A
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German (de)
English (en)
Other versions
EP2899312B1 (fr
Inventor
Marion Fessl
Thomas Gerhardt
Kathrin Hovestadt
Matthias Pfeiffer
Wolfram 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
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.)
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Publication date
Application filed by Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
Publication of EP2899312A1 publication Critical patent/EP2899312A1/fr
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Publication of EP2899312B1 publication Critical patent/EP2899312B1/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 two-stage watermark and a method for producing 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 object of the invention is to provide a dewatering screen for the production of paper with a two-stage watermark, which combines high security against counterfeiting with an attractive visual appearance and great design freedom for the designer.
  • the height base level of a motive generating area is that height level which occupies more than 60%, preferably more than 70%, particularly preferably more than 75% of the area of the motive generating area.
  • the motif elements are then formed relative to the height base level, either by elevations projecting from the main body or by depressions projecting into the main body.
  • the height base level of the positive motive generating area is advantageously at the height level of the sieving surface on which Paper is attached.
  • the height base level of the negative motive generating area is advantageously between 0.1 mm and 2 mm above the height level of the sieving surface.
  • the height base level of the base body advantageously drops in a transition region from the negative engine generating region to the positive engine generating region whose transition width is 0.6 mm or less, preferably 0.5 mm or less, more preferably 0.4 mm or less ,
  • the elevations and depressions preferably each have sharp edges with a marginal width of 0.6 mm or less, preferably 0.5 mm or less, particularly preferably 0.4 mm or less. Furthermore, in the case of M1) and K1), it is advantageously provided that at least one motive generating area with elevations and at least one motive generating area with depressions adjoin one another directly.
  • the characteristic lateral dimension is in particular the line width or the diameter of the motif elements.
  • the large characteristic lateral dimension is advantageously greater by at least a factor of 5, in particular by a factor of 8, than the small characteristic lateral dimension.
  • the small characteristic lateral dimension in advantageous constructions is 0.6 mm or less, preferably 0.5 mm or less, particularly preferably 0.4 mm or less.
  • the large characteristic lateral dimension is in advantageous embodiments 1.5 mm or more, preferably 2.0 mm or more, more preferably 2.5 mm or more.
  • the motif structures with the large characteristic lateral dimension advantageously have sharp edges with one Edge width of 0.6 mm or less, preferably 0.5 mm or less, more preferably 0.4 mm or less.
  • the motif elements of at least one of the motif creation areas form an alphanumeric character string.
  • the motif elements of at least one of the motif generation areas can form a dot or line grid. It can be provided in particular that the point or line grid is arranged inside or outside an alphanumeric string.
  • the motif elements are formed integrally with the base body.
  • a particularly high stability of the watermark insert can be ensured with simple production even with small dimensions and sharp edges of the motif elements.
  • the motif elements designed as elevations protrude vertically from the base body and the motif elements formed as depressions project vertically into the base body.
  • the watermark insert is an injection molding 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.
  • the watermark insert may also be made by deep drawing or hot stamping.
  • a separate watermark insert can be made first and perforated, and the separately produced watermark insert then connected to the carrier screen, in particular welded or glued.
  • a plastic plate can be inserted into the carrier screen, and a watermark insert can be produced from the plastic plate used in the deep-drawing process or in the hot stamping process.
  • the watermark insert integrated in the carrier screen is then perforated, optionally together with the carrier screen.
  • an already pre-perforated plastic plate can also be used so that the subsequent perforating step can be dispensed with.
  • 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 recess can be produced 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 extending 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 Mixed fabric, or contains 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.
  • Fig. 1 1 shows a schematic view of a section of a banknote 10 with a two-level watermark 14 that was produced in the paper substrate 12 of the banknote.
  • the watermark 14 like the watermarks shown below, is shown in black on a white background for reasons of drawing.
  • watermarks represent thin spots in a security paper, such as the paper substrate 12, which are usually barely or not at all visible in reflected light and which appear in transmitted light with bright areas against the darker background of the undiluted paper substrate.
  • the two-stage watermark 14 shows a motif with two opposing motif components 20, 30, namely a motif component 20 in a positive representation and an immediately adjacent motif component 30 in a negative representation.
  • the first motif component 20 contains as motif bright motif structures 22, which in the exemplary embodiment form the letters "POS" in front of the dark background 24.
  • the first motif component 20 represents a positive motif component (or motif component in a positive representation), since the bright motif structures 22 not only with the dark background 24 of the motif component 20, but also with the dark background of the paper substrate 12 outside the watermark 14 contrast, and the motif component 20 is therefore designed as a conventional positive representation.
  • the second motif component 30 contains as motif dark motif structures 32, in the exemplary embodiment form the letters "NEG" "in front of the light background 34.
  • the second motif component 30 represents in the context of this application a negative motif component (or: motif component in negative representation), since the dark Although motif structures 32 contrast with the light background 34, they have the same brightness as the dark background of the paper substrate 12 outside the watermark 14, so that the motif component 30 is shaped like a conventional negative representation.
  • the two motif components 20, 30 appear to the viewer with a clearly different, even contrasting appearance. On the one hand, this draws attention to the watermark 14 and on the other hand ensures its easy recognition.
  • the contrasting appearance is enhanced by the fact that the positive and negative motivational component 20, 30 directly adjoin one another with a sharp transition.
  • both the bright motif structures 22 and the dark motif structures 32 are formed with very sharp edges, so that the positive and the negative motif component 20, 30 each appear sharp and with high contrast.
  • the dewatering screen 40 comprises a carrier screen 42 with a screen fabric 44, which is cut out in a partial region 50.
  • 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 contain, for example, 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 54 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.
  • the plastic watermark insert 54 is an injection-molded element which is injected with a corresponding tool mold directly into the cut-out portion 50 of the mesh fabric 44 and thereby enters into a particularly intimate connection with the mesh fabric.
  • the injection-molded watermark insert 54 consists of a main body 56, which has on its upper side two opposing motif-generating regions 60, 70, which serve to generate the motif components 20, 30 of the watermark motif.
  • Each motif generation area 60, 70 includes a A plurality of motif elements 62 and 72, respectively, which are formed in the first motive generating area 60 as protrusions 62 projecting from the main body 56 and in the second motive generating area 70 as depressions 72 projecting into the main body 56.
  • the height level 64, 74 of the main body 56 in the two motive generating areas 60, 70 is different, wherein the height base level of a motive generating area is defined as that height level occupying more than 75% of the area of the respective motive generating area.
  • the watermark insert 54 By producing the watermark insert 54 by injection molding, it is possible to ensure that the height base level of the base body drops in a very narrow transition region 78 with a transition width of only 0.5 mm or less from the negative engine generation region 70 to the positive engine creation region 60.
  • the transition width is the width within which the height difference drops from 90% to 10% for both motive generation areas.
  • the narrow transition region creates a sharp transition between the positive and the negative motif component 20, 30 in the papermaking process, so that they are juxtaposed abutting each other ( Fig.1 ).
  • the height level 64 of the main body 56 is at the level of the screen surface 52. Starting from this height level 64, the motive elements 62 of the first motive region 60 from the body 56 are protruding peaks lying on the height level 64 areas a dark background 24 unchanged paper thickness, in front of which by the motif elements Lift off 62 generated thin spots as bright motifs 22, so that the in Fig. 1 shown positive motif component 20 is generated.
  • the bumps 62 may be formed with sharp edges 66 having a margin width of 0.5 mm or less.
  • the edge width is the width within which the height of the elevations drops from 90% of the maximum height to 10%.
  • the sharply bordered elevations 62 produce thinly bounded thin areas during papermaking and thus the desired sharply bordered bright motif structures 22 (FIG. Fig. 1 ).
  • the second motive generating area 70 the height level 74 of the main body 56 is above the screen surface 52. From this height level 74, the motive elements 72 of the second motive generating area 70 project into recesses 56 in the body 56. In papermaking, the second motive generating area 70 generates with its at the height level 74 lying areas a lighter background 34 of lesser paper thickness. In the depressions of the motif elements 72, the height level of the watermark insert 54 is at the level of the sieve surface 52, so that the motif elements 72 produce areas of unchanged paper thickness which stand out against the light background 34 when viewed in transmitted light as dark motif structures 32, so that the in Fig. 1 shown negative motif component 30 is generated.
  • the recesses 72 can be formed with sharp edges 76 having a margin width of 0.5 mm or less.
  • the edge width is the width within which the depth of the depressions drops from 90% of the maximum depth to 10%.
  • the sharply edged recesses 72 produce areas of paper thickness sharply edged in paper production and thus sharply edged dark motif structures 32 (FIG. Fig. 1 )
  • the main body 56 is provided with a plurality of perforations 58.
  • the diameter of the perforations 58 is chosen so small that they do not adhere to fibers in paper production. Typical perforation diameters are between 100 ⁇ m and a few 100 ⁇ m, for example about 500 ⁇ m.
  • Fig. 3 shows as a further embodiment of the invention in a schematic representation a plan view of a section of a banknote 10 with a two-stage watermark 16, which is generated in the paper substrate 12 of the banknote.
  • the watermark 16 shows a motif with two opposing motif components 80, 90, namely a microscopic motif component 80 and a macroscopic motif component 90, which are arranged several times next to one another.
  • the first motif component 80 contains small motif structures 82 with a line width of only 0.5 mm, which form the bright lettering "micro" in front of the dark background 84 in the exemplary embodiment. Because of the small characteristic dimensions of the motif structures 82, in this case the low line width, the first motif constituent 80 in the context of this application represents a microscopic motif component.
  • the second motif component 90 contains large motif structures 92 with a line width of 2.5 mm, ie a multiple of the line width of the small motif structures 82.
  • the large motif structures 92 in the exemplary embodiment form the bright lettering "macro" against a dark background 94. Because of the large characteristic dimensions the motif structures 92, here the large line width, represents the second motif component 90 in the context of this application is a macroscopic motif component.
  • the two motif components 80, 90 appear to the viewer because of the great difference in line weights with a clearly different, even contrasting appearance. On the one hand, this draws attention to the watermark 16 and on the other hand ensures easy recognition of the watermark 16.
  • the large motif structures 92 are formed with very sharp edges, so that both the microscopic and the macroscopic motif component 80, 90 each appear with high contrast.
  • the watermark insert 100 is an injection-molded element that is injected directly into the cut-out portion of the screen fabric 44 with a corresponding tool shape.
  • the injection-molded watermark insert 100 consists of a base 102 having on its top two opposing motif-forming regions 110, 120 serving to create the motif components 80, 90 of the watermark motif.
  • Each engine generation area contains a plurality of motif elements 112 and 122, which in the embodiment of the FIGS. 3 and 4 are formed in both motif generating areas as protruding from the base 102 surveys.
  • the height level 104 of the main body 102 is at the level of the sieve surface 52.
  • the motif elements can also be designed as recesses projecting into the main body.
  • Reference quantity for determining whether motif elements protrude from the base body or protrude into the main body is here also the height level which occupies more than 75% of the area of the respective motive generating area and which is defined as the height base level of the basic body in the respective motive generating area.
  • the motif elements 112 have a characteristic lateral dimension, in this case a line width 114, of only 0.5 mm. Therefore, in papermaking, the first pattern forming area 110, with its areas lying on the height level 104, creates a dark background 84 of unaltered paper thickness, against which the thin spots created by the motifs 112 in the paper stand out as microscopic motifs 82, so that the in Fig. 1 shown microscopic motif component 80 is generated.
  • the motive elements 122 have a characteristic lateral dimension that is 5 times greater, namely a stroke width 124 of 2.5 mm.
  • the motif elements 122 can be formed with sharp edges 126 having a margin width of 0.5 mm or less.
  • the edge width is the width within which the height of the motif elements 122 drops from 90% of the maximum value to 10%.
  • the second motif-generating region 120 with its regions lying on the height level 104, produces a dark background 94 of unchanged paper thickness, before which the thin spots in the paper created by the sharp-edged motif elements 122 stand out as macroscopic, sharply bordered motif structures 92, so that the in Fig. 1 shown macroscopic motif component 90 is generated.
  • its main body 102 is provided with a plurality of perforations 58, as already described in connection with FIG Fig. 2 described.
  • Fig. 5 shows in the (a) to (d) further embodiments inventively generated two-stage watermark in a paper substrate 12. From the appearance of the watermark shown results together with the following explanations the formation of the associated Enticass mecanicssiebs respectively based on the above explanations to the FIGS. 1 to 4 ,
  • the watermark 130 of the Fig. 5 (a) is a variation of the watermark of the Figures 1 and 2 and has a positive motif component 20 and a negative motif component 30.
  • the negative motif component 30 contains dark motif structures 32, which in the exemplary embodiment of FIG Fig. 5 (a) is formed by the upper half of the word "positive-negative” in front of a light background 34.
  • the positive motif component 20 contains bright motif structures 22, which is formed by the lower half of the word "positive-negative” in front of the dark background 24.
  • the bright motif structures 22 are opposite the dark motif structures 32 by one predetermined distance, for example, by half a line width, shifted to the right to create a complex and difficult to adjust appearance in the watermark 130.
  • both the bright motif structures 22 and the dark motif structures 32 are formed with very sharp edges, so that the positive and the negative motif component 20, 30 appear in each case with high contrast abutting.
  • the watermark 140 of the Fig. 5 (b) is a variation of the watermark of the FIGS. 3 and 4 and has as macroscopic motif component 90 the lettering "INLINE" in bold negative type.
  • the characteristic dimension of this macroscopic motif component is given by the stroke width of the bold negative writing, which is, for example, 6 mm, the margin width of the lettering being 0.5 mm or less.
  • the inside of the bold lettering "INLINE” forms the microscopic motif component 80 in which again the lettering "INLINE", this time in a narrow positive script 82 is arranged.
  • the characteristic dimension of this microscopic motif component is given by the stroke width of the positive writing, which is for example 0.5 mm.
  • the watermark 150 of the Fig. 5 (c) shows as macroscopic motif component 90 the letter sequence "PLPLPL" in bold positive script.
  • the characteristic dimension of this macroscopic motif component is given by the stroke width of the bold positive writing, for example 5 mm, with the border width of the lettering is 0.4 mm or less.
  • the surrounding area of the bold lettering "PLPLPL” forms the microscopic motif component 80 in which there is a fine dot matrix.
  • the characteristic dimension of this microscopic motif component is given by the diameter of the individual points 82, which in the exemplary embodiment is 0.4 mm.
  • the watermark 160 of the Fig. 5 (d) as a macroscopic motif component 90 the letter sequence "PLPLPL" in bold negative type.
  • the characteristic dimension of this macroscopic motif component is given by the stroke width of the bold negative writing, which is, for example, 8 mm, wherein the marginal width of the lettering is 0.5 mm or less.
  • the inside of the bold lettering "PLPLPL” forms the microscopic motif component 80 in which a fine dot matrix is arranged.
  • the characteristic dimension of this microscopic motif component is given by the diameter of the individual points 82, which in the exemplary embodiment is 0.5 mm.

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EP15000242.6A 2014-01-28 2015-01-27 Toile d'égouttage pour la fabrication de papier doté d'un filigrane à deux tons et procédé de fabrication de ladite toile Active EP2899312B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014001068.6A DE102014001068A1 (de) 2014-01-28 2014-01-28 Entwässerungssieb für die Herstellung von Papier mit einem zweistufigen Wasserzeichen

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EP2899312A1 true EP2899312A1 (fr) 2015-07-29
EP2899312B1 EP2899312B1 (fr) 2021-11-10

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DE (1) DE102014001068A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016075449A1 (fr) * 2014-11-10 2016-05-19 De La Rue International Limited Élément de formation de filigranes
WO2019051434A1 (fr) * 2017-09-11 2019-03-14 Crane & Co., Inc. Feuille de filigrane, appareil et document, et leurs procédés de fourniture
DE102018004995A1 (de) 2018-06-22 2019-12-24 Giesecke+Devrient Currency Technology Gmbh Sicherheitspapierbahn mit Wasserzeichen und Entwässerungssieb zur Herstellung von Wasserzeichenpapier
WO2020078579A1 (fr) 2018-10-16 2020-04-23 Giesecke+Devrient Currency Technology Gmbh Procédé et dispositif de fabrication d'un papier de sécurité doté d'un fil fenêtré
RU2787863C2 (ru) * 2017-09-11 2023-01-13 Крейн Энд Ко., Инк. Устройство для создания водяных знаков, лист и документ с водяными знаками, а также способы их изготовления

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008071325A1 (fr) * 2006-12-12 2008-06-19 Giesecke & Devrient Gmbh Tamis d'égouttage et son procédé de fabrication
US20100006248A1 (en) * 2006-05-08 2010-01-14 John Martin Haslop Security Substrate Comprising Watermark
WO2013140126A1 (fr) * 2012-03-19 2013-09-26 De La Rue International Limited Électrotype pour former une image pendant un procédé de fabrication de papier

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100006248A1 (en) * 2006-05-08 2010-01-14 John Martin Haslop Security Substrate Comprising Watermark
WO2008071325A1 (fr) * 2006-12-12 2008-06-19 Giesecke & Devrient Gmbh Tamis d'égouttage et son procédé de fabrication
WO2013140126A1 (fr) * 2012-03-19 2013-09-26 De La Rue International Limited Électrotype pour former une image pendant un procédé de fabrication de papier

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016075449A1 (fr) * 2014-11-10 2016-05-19 De La Rue International Limited Élément de formation de filigranes
US10632780B2 (en) 2014-11-10 2020-04-28 Portals De La Rue Limited Watermarking
WO2019051434A1 (fr) * 2017-09-11 2019-03-14 Crane & Co., Inc. Feuille de filigrane, appareil et document, et leurs procédés de fourniture
CN111051611A (zh) * 2017-09-11 2020-04-21 克瑞尼股份有限公司 水印片板、装置和文档、以及用于提供水印片板、装置和文档的方法
US10843500B2 (en) 2017-09-11 2020-11-24 Crane & Co., Inc. Watermark sheet, apparatus, and document, and methods for providing the same
RU2787863C2 (ru) * 2017-09-11 2023-01-13 Крейн Энд Ко., Инк. Устройство для создания водяных знаков, лист и документ с водяными знаками, а также способы их изготовления
CN111051611B (zh) * 2017-09-11 2023-02-28 克瑞尼股份有限公司 水印片板、装置和文档、以及用于提供水印片板、装置和文档的方法
DE102018004995A1 (de) 2018-06-22 2019-12-24 Giesecke+Devrient Currency Technology Gmbh Sicherheitspapierbahn mit Wasserzeichen und Entwässerungssieb zur Herstellung von Wasserzeichenpapier
WO2019242881A1 (fr) 2018-06-22 2019-12-26 Giesecke+Devrient Currency Technology Gmbh Bande de papier de sécurité à filigrane et tamis d'égouttage pour la fabrication de papier à filigrane
WO2020078579A1 (fr) 2018-10-16 2020-04-23 Giesecke+Devrient Currency Technology Gmbh Procédé et dispositif de fabrication d'un papier de sécurité doté d'un fil fenêtré
CN112888573A (zh) * 2018-10-16 2021-06-01 捷德货币技术有限责任公司 用于制造具有开窗防伪线的防伪纸的方法和装置
CN112888573B (zh) * 2018-10-16 2022-05-31 捷德货币技术有限责任公司 用于制造具有开窗防伪线的防伪纸的方法和装置

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DE102014001068A1 (de) 2015-07-30
EP2899312B1 (fr) 2021-11-10

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