EP3428341A1 - Tamis d'égouttage pour la fabrication de papier - Google Patents

Tamis d'égouttage pour la fabrication de papier Download PDF

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Publication number
EP3428341A1
EP3428341A1 EP18000595.1A EP18000595A EP3428341A1 EP 3428341 A1 EP3428341 A1 EP 3428341A1 EP 18000595 A EP18000595 A EP 18000595A EP 3428341 A1 EP3428341 A1 EP 3428341A1
Authority
EP
European Patent Office
Prior art keywords
screen
watermark
support
relief
paper
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP18000595.1A
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German (de)
English (en)
Inventor
Astrid DREXLER
Andreas Aigner
Andreas HÄNELT
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 Currency Technology 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 Currency Technology GmbH filed Critical Giesecke and Devrient Currency Technology GmbH
Publication of EP3428341A1 publication Critical patent/EP3428341A1/fr
Withdrawn legal-status Critical Current

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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 generally relates to a dewatering screen for the production of watermark paper. It relates in particular to a dewatering screen with a carrier screen and at least one watermark element arranged on the carrier screen with a relief in the form of a watermark to be generated.
  • the invention also relates to a round screen for a paper machine or the like whose production screen jacket is formed by such a dewatering screen, and to a method and apparatus for producing a dewatering screen for the production of watermarked paper.
  • the embossing of the bronze sieves, the soldered-on electrotypes and the injection-molded inserts each produce watermarks with an appearance in the paper that is characteristic of the respective technique.
  • the combination of the above-mentioned techniques therefore makes it possible to generate structurally attractive, spatially-effective watermarks with high security against counterfeiting.
  • 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 creation of visually attractive watermarks with high security against counterfeiting.
  • the at least one watermark element is formed by a stick-relief structure embroidered onto the carrier screen or by a watermark insert connected to the carrier screen by stitching.
  • visually attractive watermarks with a strongly textile appearance in the paper can be produced with the aid of the embroidery technique.
  • Such watermark elements can also be used in particular in plastic mesh fabrics and combined there with other watermarking techniques, in particular with injection-molded inserts.
  • the embroidered embossed relief structure comprises a sequence of stitches to straight or curved lines that form a raised, unfilled ornament or a raised, unfilled continuous pattern.
  • the embroidered embossed relief structure may also include a plurality of closely spaced zig-zag stitches forming a raised, filled ornament or a raised, filled continuous pattern.
  • the raised lines of the embossed relief structure create bright lines in the watermark during papermaking, while the raised, closely spaced zig-zag stitches create bright-appearing areas in the watermark.
  • embossed relief structures can also be designed in the form of characters, numbers and codes and represent, for example, an alphanumeric string, a serial number or a barcode.
  • the term ornament therefore includes in the context of this description not only patterns, but in particular also characters, numbers and codes.
  • the embroidered relief structure embroidered onto the carrier screen can also fulfill other functions in addition to its watermark-generating function.
  • the embossed-relief structure can be used to clean cut-off fabric edges of the screen fabric and to join two or more fabric layers.
  • a suitable stitch is used.
  • the embroidered embossed-relief structure connects two subregions of the carrier screen to one another, wherein, in particular, two edge regions of the carrier screen can be connected to the production screen jacket of a round screen.
  • the fauxzuChenden edge portions are preferably sewn together shock to shock.
  • edges are formed so that they mesh in a grid-like manner during the impact-on-impact encounter.
  • the edges are cut in a zigzag shape or have rectangular recesses.
  • the embroidered embossed relief structure serves both as a sieve seam and as a watermark-generating element in the connecting region of the two edge regions.
  • the grid of the seam ensures the dimensional accuracy of the seam and requires no manual work to position the two edge areas during further processing.
  • a plastic adhesive is further applied in the connection region of the two subregions, which prevents a separation of the threads.
  • the embroidered embossed relief structure is advantageously formed by an embroidery thread, in particular completely formed by a single embroidery thread.
  • the embroidery thread has a double function, since it forms the watermark-generating embroidery relief structure with its subareas lying above the surface of the support screen and, with its subregions engaging in the support screen, firmly bonds the embroidery relief structure to the screen fabric of the support screen.
  • the embroidery thread can be formed for example by a plastic multifilament thread. In principle, however, other embroidery threads suitable for the embroidery process come into consideration, which are tailored to the embroidery machine used, the embroidery needle and the screen mesh. Optionally, the embroidery thread can be used with a matching, different lower thread.
  • the thread thickness can vary over a wide range, whereby the rule of thumb thread thickness ⁇ mesh size - needle thickness has proven.
  • the embroidery thread may consist in particular of polyester, polyetheretherketone, polyamide or another higher-value plastic.
  • a plurality of watermark elements is arranged on the carrier screen substantially nationwide, which produce a substantially nationwide watermark basic pattern in the paper in papermaking.
  • a nationwide Arrangement is understood in this context, an arrangement in which the distance between adjacent watermark elements is not greater than twice the maximum diameter of the watermark elements.
  • the spacing of adjacent watermark elements is even at most as large as the maximum diameter of the watermark elements.
  • endless watermark elements instead of the maximum diameter, the transverse extent occurs perpendicular to the endless extent of the watermark elements.
  • Such basic watermark patterns give the paper a characteristic overall appearance that is easy to check and distinguish from other paper designs.
  • the nationwide arranged watermark elements are formed in particular by embroidery relief structures in the form of ornaments or continuous patterns.
  • the dewatering screen contains embroidered markings, such as control marks, track lines, register control marks or bow markings. These embroidered markings are provided in particular in addition to the useful watermarks already described in more detail.
  • the watermark insert connected to the carrier screen by embroidering is formed by a metal plate or an injection-molded insert.
  • the watermark insert serves to generate the desired watermark in the security paper and is designed accordingly.
  • the connection of the watermark insert to the carrier wire by embroidering not only creates a strong connection of the two elements, but also produces a characteristic and visually attractive appearance in the connection area. Different stitches can be selected for attachment of the watermark insert, the visual appearance of which in the watermark can absorb or supplement the appearance of the watermark generated by the metal plate or the injection-molded insert.
  • a dewatering screen can have embossed relief structures embroidered onto the carrier screen as well as watermark inserts connected to the carrier screen by embroidering, in order to further increase the creative possibilities of variation.
  • a plurality of watermark elements are advantageously arranged at a distance on the carrier screen, which are formed by web-shaped embroidered embossed relief structures or by bar-shaped web inserts connected to the carrier screen by embroidering.
  • the sieve fabric of the dewatering screen can be a metal fabric, in particular a bronze fabric, or a metal-plastic mixed fabric, in particular a bronze-plastic mixed fabric. At present, however, it is particularly preferred if the sieve fabric of the dewatering screen is a pure plastic fabric.
  • the support screen in addition to said at least one watermark element in a partial area on a multi-level relief in the form of another watermark to be generated, wherein the multi-level relief is formed by an injection-molded, perforated watermark insert.
  • the watermark insert can in particular be welded or glued to the support screen, or be injected directly into the support. Further details of such an injection-molded, perforated watermark insert can the document DE 10 2006 058 513 A1 are removed, the disclosure of which is included in the present application in this respect.
  • All three mentioned weft thread systems fulfill a specific function within the single-layer drainage wire.
  • the first, coarse weft system serves as a stabilizing support system
  • the second, fine weft system provides a smooth, finely textured surface for paper formation
  • the third weft system serves to set a desired overall thickness of the mesh.
  • the connection of the three weft thread systems arranged one above the other takes place exclusively via the warp binder thread system whose threads run perpendicular to the weft thread systems.
  • the threads of the first, second and third weft thread system advantageously run substantially all parallel to one another.
  • the threads of the first, second and third weft thread system advantageously each form a thread plane which does not interfere with the thread plane of the other two weft thread systems.
  • the filaments of the warp binding system are not limited to one plane, but extend partially above, below and between the planes of the three weft systems and thus interweave them with each other.
  • the thread thickness of the third weft thread system arranged in the intermediate plane is advantageously selected such that a desired overall thickness of the screen fabric is achieved.
  • the thread thickness of the third weft thread system is between the thread thickness of the first, coarse weft thread system and the thread thickness of the second, fine weft thread system.
  • the thread thickness of the first weft thread system is advantageously between 0.5 and 0.8 mm, preferably about 0.6 mm.
  • the thread thickness of the second weft thread system is advantageously between 0.1 and 0.3 mm, preferably about 0.2 mm, and the thread thickness of the third weft thread system is advantageously between 0.4 and 0.8 mm.
  • the thread thickness of the warp binder thread system is advantageously between 0.05 and 0.2 mm, preferably about 0.15 mm.
  • the fine weft thread system is preferably provided with a coating for distortion stabilization, which may be formed for example by an impregnating coating.
  • the thread systems of the dewatering screen are advantageously made of polyester, polyetheretherketone or another higher-value plastic.
  • the invention also includes a round screen for a paper machine or the like, having a production screen jacket formed by a dewatering screen of the type described.
  • the invention further includes a method of producing a dewatering screen for the production of watermarked paper in which a carrier screen is provided and at least one watermarking element having a relief in the form of a watermark to be formed is placed on the carrier screen by applying a stick relief structure to the screen A carrier wire is embroidered or by a watermark insert is connected by stitching to the carrier screen.
  • the invention also includes an apparatus for producing a dewatering screen for the production of watermarked paper, with a screen processing surface for receiving a dewatering screen, and with an embroidery head for embroidering a stick-relief structure on the carrier screen and / or for connecting a watermark insert to the carrier screen by embroidery.
  • Fig. 1 shows a schematic representation of a produced with a dewatering screen according to the invention banknote 10.
  • the banknote 10 contains, in addition to other, not shown in the figure security and design features in particular an ornamental watermark 12 and an over the entire width of the note extending endless watermark 14.
  • the watermarks 12, 14 actually represent particularly bright spots in the banknote paper in transmitted light.
  • the two watermarks are in Fig. 1 drawn inverted, so that in the figure shown in black lines 16,17 and surfaces 18 actually occur in transmitted light as a particularly bright lines or surfaces in appearance.
  • the ornamental watermark 12 and the endless watermark 14 are produced by embroidered relief structures on the dewatering screen used for papermaking. They show a characteristic, strongly textile appearance, which gives the security paper of banknote 10 a distinctive character with high recognition value and thus also high security against counterfeiting.
  • Fig. 2 shows schematically two sections of the plastic dewatering screen 20 used for papermaking in supervision.
  • the plastic dewatering screen 20 includes Support screen 21, the single-layer plastic screen fabric 30 in Fig. 3 is shown in more detail in cross section.
  • the single-ply plastic screen fabric 30 includes three stacked weft yarn systems 22, 24, 26 and a weft binder system interweaving the weft yarn system 28, the section of the Fig. 3 parallel to the warp threads and perpendicular to the weft thread systems.
  • the underside machine side of the screen fabric 30 consists of a first, coarse weft thread system 22, the parallel threads in the embodiment have a thread thickness of 0.6 mm and the screen fabric 30 give the necessary stability.
  • the top paper side of the screen fabric 30 is formed by a second, fine weft system 24 whose parallel threads have a thread thickness of only 0.2 mm and which provides a finely textured surface for paper attachment.
  • a third weft thread system 26 is arranged, wherein the thread thickness of the parallel threads of the third weft thread system 26 is selected so that a desired total thickness of the wire cloth 30 is achieved.
  • the thread thickness of the parallel threads of the weft thread system 26 is about 0.47 mm and leads to a total thickness of the screen fabric 30 of 1.6 mm.
  • the weft thread systems 22, 24, 26 are interwoven with a fine warp binding system 28 whose thread thickness is 0.15 mm in the exemplary embodiment.
  • a fine warp binding system 28 whose thread thickness is 0.15 mm in the exemplary embodiment.
  • two actually consecutive thread sections of the warp binder thread system 28 are shown by solid or dashed lines by way of example.
  • the threads of the thread systems 22, 24, 26, 28 may for example consist of polyester or polyetheretherketone.
  • the support screen 21 is provided with watermark elements in the form of embroidered embossed relief structures 40, 50.
  • the embossed relief structures 40, 50 are formed by a straight, bent or zig-zag embroidery thread 42 and 52 and at the same time by the same embroidery thread 42, 52 firmly woven into the support 21.
  • Embossed relief structure 40 shown on the left comprises a sequence of stitches to curved lines 44, which form a raised, linear ornament piece on the surface of the support screen 21.
  • Another filled ornamental piece 46 is formed by a plurality of closely juxtaposed zig-zag stitches which together form a small, raised surface on the surface of the support wire 21. While the raised lines 44 in papermaking lead to light lines 16 in the watermark 12, the raised surface of the zigzag stitches creates a corresponding, uniformly bright appearing patch 18 in the watermark 12.
  • Embossed relief structure 50 shown on the right comprises a sequence of stitches to form straight lines 54 which form a raised, unfilled, continuous line pattern 54 on the surface of the carrier screen 21.
  • the raised line pattern 54 results in papermaking according to the bright in transmitted light, formed from line pieces 17 endless line pattern of the watermark 14th
  • a 100% polyamide multifilament thread can be used, specifically about an ONYX 80 polyamide 6.6 thread.
  • the embroidered relief structures embroidered on the support screen 21 may be formed in a variety of shapes and sizes. In addition to the already illustrated ornaments and continuous patterns, embossed relief structures in the form of characters, numbers and codings are also possible. Exemplary in the supervision of the Fig. 4 two embossed relief structures 60, 70 each shown in the form of the letter "A". In the embroidery relief structure 60 shown on the left, the embroidery thread 62 is arranged with a series of stitches to straight lines 64, which form the raised outline of the letter "A" on the surface of the support screen.
  • zig-zag stitches 72 are formed with the embroidery thread, as shown schematically in detail detail 76.
  • the zigzag stitches 72 completely fill out the outline 74 of the letter and together form on the surface of the carrier screen 21 a raised surface in the shape of the desired letter "A".
  • the embossed relief structure 60 in the paper produces a watermark in the form of a light letter outline "A", while the watermark generated by the embossed relief structure 70 shows the letter "A” in transmitted light as a bright, filled area.
  • a plurality of embossed relief structures 82 may also be provided on the carrier screen 80, which are formed, for example, in the form of small star-shaped ornaments extending over the entire surface of the carrier screen 21 and thus during paper manufacture a paper with a substantially nationwide watermark Generate basic patterns. It is understood that 80 additional watermark elements, for example in the form of more on such a carrier screen Embossed relief structures or in the form of watermark inserts may be provided, which may be introduced by injection molding in a recess of the support wire, for example.
  • Fig. 6 shows by way of illustration a design in which a plurality of stitches to curved wavy lines 84 are strung together on the surface of the support screen 80 with an embroidery thread. The resulting paper then shows a nationwide basic watermark pattern of bright wavy lines.
  • an endless embroidered embossed relief structure 90 can connect two partial regions 92, 94 of a dewatering screen.
  • two edge regions 92, 94 that is to say, for example, the right and left edge regions of a planar dewatering screen, can be connected to the production screen jacket of a cylindrical circular screen.
  • the embossed relief structure 90 thus serves, on the one hand, as a screen seam and, on the other hand, at the same time as a watermark-generating element.
  • plastic screens can be used for the first time as production screens for round screens.
  • the threads of the plastic sieve in the End portions of the edge portions cut off and fused, in particular by laser processing or by hot blades.
  • an ONYX 80 polyamide 6.6 thread can be used as the embroidery thread.
  • other seam patterns than those in Fig. 7 shown pattern can be used for the connection, for example, a 4-stitch zig-zag pattern with a width of about 8 mm.
  • a plastic adhesive is advantageously applied to the inner side of the screen in the connection region 96 for the purpose of securing, in order to prevent separation of the threads.
  • Fig. 8 illustrates another way to provide a carrier screen 100 by embroidering with a watermark element.
  • the watermark element is formed by a watermark insert 102 connected to the carrier screen 100 by stitching.
  • the watermark insert 102 may be, for example, a metal plate or an injection molding insert that produces a desired watermark in the security paper.
  • the watermark insert 102 is embroidered with decorative and / or utility stitches with the embroidery thread 104 on the support screen 100, whereby on the one hand a firm connection of the watermark insert 102 is ensured with the support plate 100, and on the other hand, the connection area formed by the stitches itself a characteristic and visually attractive Appearance.
  • the attachment of the watermark insert 102 by means of the embroidery thread 104 itself becomes a part of the security feature which can not be easily mimicked by other attachment methods such as gluing, welding or a spraying technique.

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EP18000595.1A 2017-07-14 2018-07-11 Tamis d'égouttage pour la fabrication de papier Withdrawn EP3428341A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017006708.2A DE102017006708A1 (de) 2017-07-14 2017-07-14 Entwässerungssieb für die Papierherstellung

Publications (1)

Publication Number Publication Date
EP3428341A1 true EP3428341A1 (fr) 2019-01-16

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EP18000595.1A Withdrawn EP3428341A1 (fr) 2017-07-14 2018-07-11 Tamis d'égouttage pour la fabrication de papier

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EP (1) EP3428341A1 (fr)
DE (1) DE102017006708A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1514238A (en) * 1922-04-07 1924-11-04 F C Huyck & Sons Means for watermarking paper
US5766416A (en) * 1989-12-14 1998-06-16 Tokushu Paper Manufacturing Co., Ltd. Method of producing watermark paper
DE102006058513A1 (de) 2006-12-12 2008-06-19 Giesecke & Devrient Gmbh Entwässerungssieb und Verfahren zu seiner Herstellung
DE102012018166A1 (de) 2012-09-13 2014-03-13 Giesecke & Devrient Gmbh Spritzgusswerkzeug zur Erzeugung eines Wasserzeicheneinsatzes in einem Entwässerungssieb
DE102013008082A1 (de) * 2013-05-10 2014-11-13 Giesecke & Devrient Gmbh Wert- und Sicherheitsdokument mit einem Wasserzeichen und einem Sicherheitsfaden
GB2532084A (en) * 2014-11-10 2016-05-11 De La Rue Int Ltd Improvments in watermarking

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1514238A (en) * 1922-04-07 1924-11-04 F C Huyck & Sons Means for watermarking paper
US5766416A (en) * 1989-12-14 1998-06-16 Tokushu Paper Manufacturing Co., Ltd. Method of producing watermark paper
DE102006058513A1 (de) 2006-12-12 2008-06-19 Giesecke & Devrient Gmbh Entwässerungssieb und Verfahren zu seiner Herstellung
DE102012018166A1 (de) 2012-09-13 2014-03-13 Giesecke & Devrient Gmbh Spritzgusswerkzeug zur Erzeugung eines Wasserzeicheneinsatzes in einem Entwässerungssieb
DE102013008082A1 (de) * 2013-05-10 2014-11-13 Giesecke & Devrient Gmbh Wert- und Sicherheitsdokument mit einem Wasserzeichen und einem Sicherheitsfaden
GB2532084A (en) * 2014-11-10 2016-05-11 De La Rue Int Ltd Improvments in watermarking

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Publication number Publication date
DE102017006708A1 (de) 2019-01-17

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