EP2769016A1 - Dewatering filter - Google Patents
Dewatering filterInfo
- Publication number
- EP2769016A1 EP2769016A1 EP12772887.1A EP12772887A EP2769016A1 EP 2769016 A1 EP2769016 A1 EP 2769016A1 EP 12772887 A EP12772887 A EP 12772887A EP 2769016 A1 EP2769016 A1 EP 2769016A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- screen
- plastic
- paper
- insert
- insert element
- 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
Links
- 239000004744 fabric Substances 0.000 claims abstract description 43
- 229910000906 Bronze Inorganic materials 0.000 claims description 25
- 239000010974 bronze Substances 0.000 claims description 25
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims description 25
- 238000005538 encapsulation Methods 0.000 claims description 17
- 239000000835 fiber Substances 0.000 claims description 17
- 238000001746 injection moulding Methods 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 8
- 238000003780 insertion Methods 0.000 claims description 7
- 230000037431 insertion Effects 0.000 claims description 7
- 239000005871 repellent Substances 0.000 claims description 5
- 150000002739 metals Chemical class 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims 1
- 238000000465 moulding Methods 0.000 abstract description 4
- 229910000831 Steel Inorganic materials 0.000 description 27
- 239000010959 steel Substances 0.000 description 27
- 238000007796 conventional method Methods 0.000 description 9
- 239000000654 additive Substances 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 7
- 238000013461 design Methods 0.000 description 7
- 238000003698 laser cutting Methods 0.000 description 6
- 239000010410 layer Substances 0.000 description 5
- 238000004080 punching Methods 0.000 description 5
- 238000001125 extrusion Methods 0.000 description 4
- 230000000007 visual effect Effects 0.000 description 4
- 238000004049 embossing Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
- D21F11/008—Making apertured paper
Definitions
- the invention relates to a dewatering screen for the production of paper with at least one security feature.
- the invention also relates to a method for producing such a dewatering screen and to a method for producing paper with a security feature using such a dewatering screen.
- pulp accumulates continuously on a moving dewatering screen and is solidified to the extent that it can be removed as a wet paper web for further processing of the dewatering screen.
- security papers for banknotes, identity documents and the like are often provided with watermarks or through holes for security purposes, which permit verification of the authenticity of the security paper and which at the same time serve as protection against unauthorized reproduction.
- Security features introduced in papermaking have typical characteristics. For example, through openings that are produced in papermaking contain characteristic irregularities in the edge region, which are produced by irregular deposition of fibers in the edge region and by individual fibers protruding into the opening, as described, for example, in document WO 03/054297.
- the present invention seeks to provide a Enticass mecanicssieb of the aforementioned type, which avoids the disadvantages of the prior art.
- the dewatering screen is intended to allow easy production of paper with security features, and ideally to allow a registered combination of security features with different visual appearances.
- a dewatering screen for the production of paper having at least one security feature comprises a carrier screen containing a screen cloth with an insert portion, an insert member disposed in the insert portion of the screen cloth for producing the at least one security feature in the paper, and a plastic overmold or plastic injection back of the insert element, which connects the insert element with the support screen.
- the security features generated in the invention include in particular watermarks, sharply edged holes in the paper and holes with characteristic irregularities in the edge region.
- the dewatering screen is designed to produce several security features in the paper, each of which may have different visual appearances, but still because of the simultaneous generation stand in the register during papermaking and the very good register tolerances when injecting or injecting.
- Several security features may in particular relate to each other or complement each other.
- a first security feature can repeat the form or shape of a second security feature or supplement it to a total information.
- a plurality of different insert elements can be integrated into a carrier screen for producing such security features by the plastic injection molding or plastic injection molding according to the invention, in particular also those insert elements which, due to their material properties or shape, do not fit into the device with conventional techniques have the desired carrier screen integrated.
- the invention thus provides, for example, in cases where the mesh of the support wire and the insert element made of different materials.
- the screen cloth and the insert element may be made of different metals, such as a bronze screen cloth and a steel insert member.
- the support screen may be made of metal and the insert element made of plastic, or conversely, the support screen made of plastic and the insert element made of metal.
- the insert element comprises a sieve element whose material and / or mesh size differs from the sieve fabric of the carrier screen.
- the sieve element can be embossed in particular.
- the screen fabric of the carrier screen is a pure plastic fabric, while the screen element comprises a bronze screen, in particular an embossed bronze screen.
- the insert element comprises an E-type or a watermark insert, in particular a tapered E-type or a multi-level watermark insert.
- Such insert elements can be advantageously formed of steel. Insertion elements, for example made of steel, can not readily be connected to a conventional bronze screen fabric using conventional techniques. The invention provides a remedy and allows to combine the advantageous properties of a bronze support wire and E types or steel watermark inserts with each other.
- the insert element comprises a pointed frame, for example a pointed steel frame, for producing a sharply edged hole in the paper.
- a pointed frame for example a pointed steel frame
- the sharply edged holes can also be accurately combined with other papermaking security features, in particular with watermarks and / or holes with characteristic irregularities in the edge region.
- the insert element comprises a metal plate and / or a plastic plate, in particular of water-repellent plastic.
- a plastic tile made of water-repellent plastic For example, it may be disposed inside an above pointed steel frame to assist in the formation of holes.
- the metal plate or the plastic plate is provided with a multiplicity of perforations whose dimensions are preferably so small that they do not adhere to fibers during papermaking.
- a thinned paper area can be created by a bronze plate with a reduced perforation density.
- the metal or plastic plate may also be imperforate, if it is to support about the formation of holes.
- the carrier screen of the dewatering screen may also include a magnetic element with which magnetic fibers and / or magnetic additives in the pulp may be affected during sheet formation.
- magnetic fibers may be aligned along the magnetic field lines of the magnetic element and fixed in their aligned orientation upon drying to provide a security feature in the form of a magnetic portion in the paper.
- the magnetic element can also lead to a targeted accumulation or depletion of magnetic additives in certain paper areas.
- the magnetic element can be advantageously contained in the insert element, for example in the form of a perforated permanent magnet.
- the magnetic element may also be formed by magnetic additives in the plastic encapsulation or the plastic back-injection.
- the magnetic element can also be arranged on inserted threads.
- the plastic encapsulation or the plastic back-injection on a surface relief for generating a two- or multi-level watermark in the paper. Since the encapsulation or back-injection usually runs around the insert element, the safety features generated by the insert element itself can be combined with another security feature in the form of a two- or multi-level frame watermark.
- the plastic encapsulation or the plastic back-injection may be provided with a multiplicity of perforations, the dimensions of which are preferably so small that they do not adhere to fibers during paper production.
- the insertion region may in particular be formed by a cut-out portion of the screen fabric.
- two or more of the concrete embodiments described are combined in an insert element in order to simultaneously produce a plurality of security features that stand in very good or even perfect register in papermaking.
- the invention also includes a process for producing a dewatering screen for papermaking, in which a carrier screen is provided, which contains a screen fabric with an insert area, in which insert area of the screen fabric an insert element for generating at least one security feature in the paper is arranged, and the insert element is encapsulated with plastic or injected behind the insert element with the carrier screen connect.
- the plastic injection molding or the plastic injection molding is provided with a plurality of perforations whose dimensions are so small that they do not adhere to fibers during papermaking.
- the perforations can be generated by means of a laser beam, preferably by means of an infrared laser.
- the invention also includes a method for producing a paper having at least one security feature, in which the paper attachment takes place on a dewatering screen of the type described.
- a sharp-edged hole is produced in the paper as a security feature.
- a hole with characteristic irregularities in the edge region and / or a watermark in the paper is produced as a security feature.
- FIG. 1 is a schematic representation of a banknote with a complex combination of several security features
- FIG. 2 shows in (a) schematically a cross section through a basic shape of a drainage sieve according to the invention, and in (b) a modification of the basic form of (a),
- FIG. 3 shows a carrier screen with an integrated insert element according to an embodiment of the invention
- FIG. 4 shows a carrier screen with an integrated insert element according to another exemplary embodiment of the invention
- Fig. 5 is a carrier screen with an integrated insert element
- FIG. 6 shows a complex embodiment, with an insert element for simultaneously generating a plurality of security features, wherein (a) shows a cross section and (b) a plan view of the dewatering screen, and (c) illustrates the visual appearance of the formed paper, Fig. 7 shows a dewatering screen with an integrated magnetic
- Fig. 8 shows the appearance of a with the Entskyssansssieb
- Fig. 7 produced paper.
- FIG. 1 shows a schematic representation of a banknote 10 with a complex combination 12 of several security features.
- the banknote 10 contains a finely structured hole 16 with a sharply delimited rim in the form of a rider, which is surrounded by a very thin paper area 15 and this by a high resolution frame watermark 14.
- the finely structured hole 16, the thin paper area 15 and the frame watermark 14 have very low register tolerances due to the overmolding or backmolding technology used.
- Such complex combinations of security features 14, 15, 16 can not already be produced in paper production by conventional methods.
- the creation of a hole with a sharply defined edge and fine contour structure, such as the hole 16 of FIG. 1 requires a separate operation by laser cutting or punching.
- relatively high register tolerances arise between the hole produced by punching or laser cutting and a watermark generated during papermaking.
- These passport tolerances limit the practical watermark / hole designs significantly, since The designer must already take into account the pass tolerances when designing the design.
- the security paper of the banknote 10 is produced by using a dewatering screen described in more detail below, whereby both the finely structured hole 16 and the thin paper area 15 and the high-resolution frame watermark 14 can already be produced in papermaking and in almost perfect register.
- the dewatering screen 20 comprises a carrier screen 22 with a screen mesh 24 which is cut out in a subregion 30.
- the screen fabric 24 has at least one system of interwoven, longitudinally extending warp threads 26 and weft threads 28 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 a pure plastic fabric.
- the support screen 22 may comprise a single-layer or multi-layer screen fabric, wherein for the sake of simplicity, only one single-layer screen fabric is shown in the figures.
- FIG. 2 (b) shows a modification of the basic form of Fig. 2 (a), in which the insert member 32 by a plastic injection molding 36 with the support 22nd connected is.
- the insert element 32, the plastic encapsulation 34 or plastic back injection 36, or even both elements are provided with perforations to ensure the dewatering in papermaking in these areas.
- the dimensions of the perforations are chosen so small that they do not adhere to fibers in paper production.
- the screen fabric 24 is not cut out, but has only one insertion region, in which the insert element is arranged.
- the screen mesh can continue to run behind the insert element during injection molding and during back molding in or behind the backspring.
- the carrier screen 40 has a bronze screen mesh 42.
- an insert member 44 is arranged, which contains a steel plate 46 with a tapered steel E-type 48.
- the insert element 44 is connected by a plastic encapsulation 34 with the support screen 40.
- a steel insert 44 with a tapered steel E-type 48 can not readily be welded to a bronze screen 42 due to the diversity of materials.
- a connection by means of electric welding fails because of the pointed E-Type 48 on the diversity of the surfaces to be joined.
- a solder joint of the steel insert element 44 with the bronze screen fabric 42 would be possible in principle, fine soldering in the acidic environment of the paper pulp will break down, and there is also the danger that the meshes of the screen fabric 42 will be closed by the solder paste.
- FIG. 4 shows a further embodiment in which the carrier screen 40 likewise has a bronze screen mesh 42.
- an insert element 50 is arranged, which contains a pointed steel frame 52. With the pointed steel frame 52, a hole 16 with a sharp edge is already produced at the position paper ago, as illustrated in Fig. 1.
- the insert element 50 with the steel frame 52 is connected to the carrier screen 40 by a plastic encapsulation 34.
- the steel frame 52 can not be integrated into the bronze carrier screen 40 for the reasons stated above.
- the insert element within the steel frame additionally contain a plastic plate 54 made of a water-repellent plastic. Such a measure is particularly suitable if only smaller holes are to be produced with the steel frame 52.
- the insert element integrated in the carrier screen 60 is formed by a screen element 64 whose material and / or mesh width differs from the screen fabric 62 of the carrier screen 60.
- the carrier sieve 60 can contain a pure plastic sieve cloth 62
- the sieve element 64 can be formed by a bronze sieve with an embossment 66 which is connected to the carrier sieve 60 by the plastic extrusion 34. In this way, an embossing 66 can nevertheless be integrated into a plastic sieve fabric 62 which can not be embossed even in a simple manner.
- Fig. 6 shows a complex embodiment in which the insert element 72 of the dewatering screen 70 is designed to simultaneously generate a plurality of different security features.
- 6 (a) shows a plan view of the dewatering screen 70. The visual appearance of the formed paper 90 is shown in FIG. 6 (c).
- the dewatering screen 70 like the dewatering screen 20 of FIG. 2, includes a carrier screen 22 having a screen mesh 24 of bronze cut in a section 30.
- an insert element 72 is arranged, which is connected by a plastic injection molding 80 with the support screen 22.
- the plastic encapsulation 80 has in this embodiment multi-level surface relief 82 and is also provided to ensure drainage during sheet formation with a variety of perforations.
- plastic overmold 80 passes around the edge of insert member 72, it forms a perforated injection molding frame which, in papermaking, creates a multilevel frame watermark 94 in paper 90, which includes the security features created by insert member 72, because of its multi-level surface relief 82 shown in Fig. 6 (c).
- the insert element 72 itself contains an only slightly perforated bronze sheet 74, which produces a very thin paper area 96 due to the low perforation density and its smooth surface in papermaking.
- a pointed steel frame 76 for producing a sharp-edged hole 98 (Fig. 6 (c)).
- the steel frame 76 can be set down so that it does not come into contact with the dandy or the take-off roll.
- a plate 78 is disposed of water-repellent plastic, which supports the hole production.
- the connection between the bronze sheet 74, the steel frame 76 and the plastic plate 78 can be done, for example, by gluing, welding, stapling or another conventional method.
- the paper 90 produced with the dewatering screen 70 outside the frame watermark 94 shows a vellum region 92 of normal paper thickness.
- the frame watermark 94 has a multi-level design, the appearance of which is given by the multi-level surface relief 82 of the plastic extrusion 80.
- a vellum region 96 is very small Paper thickness, which is produced by the small perforated bronze sheet 74, and within this thin Velin Studs 96 is a finely structured, sharply edged hole 98 in the form of a rider arranged.
- all these different security elements are produced simultaneously in papermaking. Their manufacture does not require separate operations, such as a laser cutting or stamping step.
- the security features due to the common generation by the insert element to each other very well in the register. In particular, there are no register fluctuations between the frame watermark 94 and the sharply defined hole 98, so that the two elements can be aligned as desired.
- FIG. 7 shows a dewatering screen 100 with a carrier screen 22 with a cut-out screen mesh 24, in the cut-out portion of which a sickle-shaped permanent magnet 102 is provided, which is provided with a multiplicity of perforations 104.
- the perforated permanent magnet 102 is connected to the support screen 22 by a plastic extrusion 34.
- the plurality of perforations 104 ensure drainage in the area of the permanent magnet 102.
- the pulp may include magnetic fibers that are aligned with the sheet formation along the magnetic field lines of the permanent magnet 102.
- the magnetic fibers are then permanently fixed in their aligned orientation.
- FIG. 8 shows a plan view of a paper 110 produced with the dewatering screen 100 of FIG. 7 with a magnetic security feature.
- a crescent-shaped portion 112 which was directly above the permanent magnet 102 during paper production, magnetic fibers contained in the pulp were aligned while the magnetic fibers in the surrounding paper portion 114 were disordered.
- subregion 112 may also differ visually from surrounding region 114.
- the pulp may contain magnetic, colored or fluorescent additives that are attracted or repelled by the permanent magnet 102, so that the concentration of these additives in the subregion 112 differs from the concentration in the surrounding region 114.
- Magnetic elements do not have to be contained in the insert element 32; they can also be formed by magnetic additives in the plastic encapsulation 34 or the plastic injection molding 36. They also do not have to be integrated into the uppermost sieve layer 24 of the carrier screen 22, but can also be arranged in a deeper sieve layer or in the interior of the round sieve. For example, they can also be on the threads that are inserted. Magnetic elements can be combined with all previously described designs. LIST OF REFERENCE NUMBERS
Landscapes
- Paper (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL12772887T PL2769016T3 (en) | 2011-10-21 | 2012-10-15 | Dewatering screen and method for manufacturing a dewatering screen |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201110116605 DE102011116605A1 (en) | 2011-10-21 | 2011-10-21 | dewatering |
PCT/EP2012/004297 WO2013056804A1 (en) | 2011-10-21 | 2012-10-15 | Dewatering filter |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2769016A1 true EP2769016A1 (en) | 2014-08-27 |
EP2769016B1 EP2769016B1 (en) | 2016-09-21 |
Family
ID=47022627
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12772887.1A Active EP2769016B1 (en) | 2011-10-21 | 2012-10-15 | Dewatering screen and method for manufacturing a dewatering screen |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP2769016B1 (en) |
DE (1) | DE102011116605A1 (en) |
ES (1) | ES2607492T3 (en) |
HU (1) | HUE032371T2 (en) |
PL (1) | PL2769016T3 (en) |
WO (1) | WO2013056804A1 (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012024774A1 (en) * | 2012-12-18 | 2014-06-18 | Giesecke & Devrient Gmbh | Drainage screen for papermaking |
DE102012014894A1 (en) * | 2012-07-27 | 2014-01-30 | Giesecke & Devrient Gmbh | dewatering |
DE102012018166A1 (en) * | 2012-09-13 | 2014-03-13 | Giesecke & Devrient Gmbh | Injection molding tool for producing a watermark insert in a dewatering screen |
DE102013008082A1 (en) | 2013-05-10 | 2014-11-13 | Giesecke & Devrient Gmbh | Value and security document with a watermark and security thread |
DE102013021179A1 (en) * | 2013-12-17 | 2015-06-18 | Giesecke & Devrient Gmbh | Drainage screen and process for its production |
DE102014001062A1 (en) * | 2014-01-28 | 2015-07-30 | Giesecke & Devrient Gmbh | Drainage screen for the production of paper with a watermark |
DE102014001048A1 (en) * | 2014-01-28 | 2015-07-30 | Giesecke & Devrient Gmbh | Drainage screen for the production of paper with a watermark |
DE102014001064A1 (en) * | 2014-01-28 | 2015-07-30 | Giesecke & Devrient Gmbh | Drainage screen for the production of paper with stiffening watermarks |
DE102014119175A1 (en) * | 2014-12-19 | 2016-06-23 | Drewsen Spezialpapiere Gmbh & Co Kg | A method of authenticating security elements and valuables made using a security paper, and security paper suitable for the method |
DE102016012464A1 (en) * | 2016-10-19 | 2018-04-19 | Giesecke+Devrient Currency Technology Gmbh | Arrangement and method for providing a drainage screen with perforated watermark inserts |
DE102019131625A1 (en) * | 2019-11-22 | 2021-05-27 | Kautex Textron Gmbh & Co. Kg | Edge design of a flat stiffening structure for a component |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10163381A1 (en) | 2001-12-21 | 2003-07-03 | Giesecke & Devrient Gmbh | Security paper and method and device for its production |
DE102006058513A1 (en) * | 2006-12-12 | 2008-06-19 | Giesecke & Devrient Gmbh | Drainage screen and process for its production |
-
2011
- 2011-10-21 DE DE201110116605 patent/DE102011116605A1/en not_active Withdrawn
-
2012
- 2012-10-15 WO PCT/EP2012/004297 patent/WO2013056804A1/en active Application Filing
- 2012-10-15 EP EP12772887.1A patent/EP2769016B1/en active Active
- 2012-10-15 HU HUE12772887A patent/HUE032371T2/en unknown
- 2012-10-15 ES ES12772887.1T patent/ES2607492T3/en active Active
- 2012-10-15 PL PL12772887T patent/PL2769016T3/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO2013056804A1 * |
Also Published As
Publication number | Publication date |
---|---|
HUE032371T2 (en) | 2017-09-28 |
EP2769016B1 (en) | 2016-09-21 |
DE102011116605A1 (en) | 2013-04-25 |
ES2607492T3 (en) | 2017-03-31 |
PL2769016T3 (en) | 2017-04-28 |
WO2013056804A1 (en) | 2013-04-25 |
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