EP3339506A1 - Toile d'égouttage pour machine à papier - Google Patents

Toile d'égouttage pour machine à papier Download PDF

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Publication number
EP3339506A1
EP3339506A1 EP17002045.7A EP17002045A EP3339506A1 EP 3339506 A1 EP3339506 A1 EP 3339506A1 EP 17002045 A EP17002045 A EP 17002045A EP 3339506 A1 EP3339506 A1 EP 3339506A1
Authority
EP
European Patent Office
Prior art keywords
weft
screen
thread
fabric
watermark
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Withdrawn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
EP17002045.7A
Other languages
German (de)
English (en)
Inventor
Andreas HÄNELT
Andreas Aigner
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 EP3339506A1 publication Critical patent/EP3339506A1/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Withdrawn legal-status Critical Current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
    • 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
    • D21F1/0027—Screen-cloths

Definitions

  • the invention relates to a dewatering screen for the production of paper with multilevel watermarks.
  • the invention further relates to a round screen for a paper machine or the like, whose production screen jacket is formed by such a dewatering screen.
  • dewatering screens for papermaking are in the documents DE 10 2006 022 059 A1 .
  • DE 10 2012 018 166 A1 For example, an injection molding tool for producing watermark inserts for a dewatering screen is known.
  • the conventional designs usually use sieves with a bronze fabric or a metal-plastic mixed fabric and are constructed in multiple layers. Proceeding from this, the present invention seeks to provide a dewatering screen of the type mentioned, which is easier to manufacture and easier to handle.
  • the invention provides a dewatering screen for the manufacture of multilevel watermarked paper comprising a single ply plastic screen fabric having three stacked weft systems and a warp binder thread system.
  • the screen fabric comprises a first coarse weft system on the underside machine side of the screen fabric, a second, fine weft system on the top side paper of the screen fabric, a third weft system disposed between the first and second weft systems, and a fine warp binder thread system through which the three weft systems are interwoven.
  • the single-layer plastic screen fabric contains a multi-level relief in the form of a watermark to be produced in a subarea.
  • the multi-level relief is preferably formed by an injection-molded perforated watermark insert.
  • All three weft yarn 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 on top of each other arranged weft thread systems takes place exclusively on the warp binder thread system whose threads are 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 mm and 0.8 mm, preferably about 0.6 mm.
  • the thread thickness of the second weft thread system is advantageously between 0.1 mm and 0.3 mm, preferably about 0.2 mm, and the thread thickness of the third weft thread system is advantageously between 0.4 mm and 0.8 mm.
  • the thread thickness of the warp binder thread system is advantageously between 0.05 mm 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.
  • Said watermark insert is arranged in an advantageous variant of the invention in a cut-out region of the plastic sieve fabric and connected thereto only in an edge region.
  • the watermark insert in the cut-out region is injected directly into the plastic mesh fabric.
  • the watermark insert is arranged in a non-cut-out region of the plastic sieve fabric and injected there directly into the plastic sieve fabric.
  • the watermark insert can practically merge with the screen mesh.
  • one working step namely the generation of a cut-out region in the screen fabric, can be dispensed with.
  • no registration of injection molded to the screen hole is required.
  • the watermark insert is excellently anchored in the mesh and it is also ensured that the watermark does not show any optical edge at the transition from the watermark insert to the mesh.
  • the watermark insert may have an edge region in which the fabric structure of the screen fabric is readjusted in order to prevent as far as possible the passage of the watermark insert into the screen fabric in the paper.
  • a two-stage relief with a strong light-dark effect can be integrated in a subarea, for example to accommodate a value number or other alphanumeric information within a finely graded gray scale motif.
  • the watermark insert has a plurality of perforations whose dimensions are so small that they do not adhere to fibers during papermaking.
  • These drainage perforations are advantageously drilled with a laser beam, for example with the beam of a CO 2 laser of a wavelength of 10.6 microns.
  • the focus diameter of the laser corresponds to the desired maximum perforation diameter and is for example 500 microns.
  • the laser irradiation is preferably carried out from the back of the watermark insert, so that due to the Gaussian energy distribution or the beam shape of the laser beam tapering, conical perforations arise to the front design surface of the insert.
  • the laser radiation can perforate the mesh as well as the watermark insert.
  • 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 round screen advantageously contains a round screen body, in particular in the form of a lamella cylinder and an intermediate felt arranged on the round screen body.
  • the dewatering screen is placed on the intermediate felt.
  • the intermediate felt prevents the lamellar structure of the lamella cylinder from being reflected through the dewatering screen into the paper.
  • Intermediate felt and drainage screen together may have the usual thickness of a bronze screen.
  • the dewatering screen according to the invention is extremely light despite high stability compared to conventional bronze screens. It is easy to transport and, in contrast to bronze screens, can be easily stacked. Compared with bronze sieves, the screen production time is greatly reduced and screen production is less prone to errors due to the smaller number of operations.
  • the storage of plastic screens is significantly easier than the storage of conventional bronze screens by their insensitivity.
  • the inventors have surprisingly found that the plastic dewatering screens according to the invention show a stronger filtering effect than comparable bronze screens. To achieve a desired opacity of the paper, therefore, less material is required, so that the amount of fines is reduced in the wastewater, which in addition to a cost savings also has a better environmental performance of the manufacturing process result.
  • the banknote 10 contains, among other security and design features, a multi-level watermark 12 in the form of a portrait in which a two-level watermark 14 in the form of the value "10" is integrated.
  • banknotes with or without such watermarks 12,14 is carried out according to the invention using a plastic dewatering screen 20, the mesh in Fig. 2 is shown schematically in cross section.
  • the dewatering screen 20 includes a single layer plastic mesh 30 having three superimposed weft systems 22, 24, 26 and a weft binder system interweaving the weft yarn systems 28, the section of the Fig. 2 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.
  • Fig. 3 (a) shows a schematic cross section and Fig. 3 (b) a plan view of the drainage screen 20.
  • the plastic dewatering screen 20 next to the in Fig. 3 Screen fabric 30, shown only schematically, has an injection-molded watermark insert 40, which is injected directly into the screen fabric 30 of the dewatering screen in the region of a recess 32.
  • the watermark insert 40 can also be injected into a non-cut-out region 32 of the screen fabric 30, the molded part virtually completely merging with the screen fabric in this area, resulting in an excellent anchoring of the molded part in the screen. Also eliminates the step of generating the recess, as well as the registration of sprue and recess.
  • the watermark insert 40 includes a high-resolution, multi-stage injection-molded relief 42 which provides a highly detailed representation of graphic motifs, such as those in U.S. Pat Fig. 1 shown portraits allowed.
  • a subarea 44 of the watermark insert 40 a two-stage motif with a strong light-dark contrast is formed, for example, the in Fig. 1 value shown "10" of the banknote.
  • the fabric structure of the screen fabric 30 is readjusted, so that the transition of the watermark insert 40 and screen fabric 30 in the finished paper is practically undetectable.
  • the latter is provided with a plurality of perforations 48 whose diameter is chosen to be small enough that no fibers adhere to them in papermaking.
  • Typical perforation diameters are between 50 ⁇ m and a few 100 ⁇ m, for example at about 500 microns.
  • Fig. 3 shows cylindrical perforations 48, but the perforations can be formed with particular advantage also conical and taper, for example, from the back of the mesh to the front design surface.
  • Fig. 4 forms the described plastic dewatering screen 20, for example, the production screen jacket of a round screen 50 of a paper machine.
  • the round screen 50 contains a round screen body 52 in the form of a laminated cylinder and an intermediate felt 54 arranged on the round screen body with a thickness of, for example, 1 cm.
  • the intermediate felt 54 prevents the lamellar structure of the lamella cylinder 52 from being pushed into the paper by the thin plastic dewatering screen 20.

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  • Paper (AREA)
EP17002045.7A 2016-12-21 2017-12-20 Toile d'égouttage pour machine à papier Withdrawn EP3339506A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102016015336.9A DE102016015336A1 (de) 2016-12-21 2016-12-21 Entwässerungssieb für die Papierherstellung

Publications (1)

Publication Number Publication Date
EP3339506A1 true EP3339506A1 (fr) 2018-06-27

Family

ID=60702286

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17002045.7A Withdrawn EP3339506A1 (fr) 2016-12-21 2017-12-20 Toile d'égouttage pour machine à papier

Country Status (2)

Country Link
EP (1) EP3339506A1 (fr)
DE (1) DE102016015336A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019033889A1 (fr) * 2017-08-17 2019-02-21 保定钞票纸业有限公司 Procédé de préparation de papier susceptible de réguler la luminosité de filigrane et produit de papier comprenant un filigrane à haute luminosité

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991017292A1 (fr) * 1990-05-08 1991-11-14 Hutter & Schrantz Ag Tissu en monofilaments plastiques pour l'utilisation comme toile d'egouttage d'une machine a papier
DE102006022059A1 (de) 2005-06-21 2006-12-28 Giesecke & Devrient Gmbh Entwässerungssieb und Verfahren zu seiner Herstellung
DE102006011621A1 (de) 2006-03-14 2007-09-20 Giesecke & Devrient Gmbh Rundsieb
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

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991017292A1 (fr) * 1990-05-08 1991-11-14 Hutter & Schrantz Ag Tissu en monofilaments plastiques pour l'utilisation comme toile d'egouttage d'une machine a papier
DE102006022059A1 (de) 2005-06-21 2006-12-28 Giesecke & Devrient Gmbh Entwässerungssieb und Verfahren zu seiner Herstellung
DE102006011621A1 (de) 2006-03-14 2007-09-20 Giesecke & Devrient Gmbh Rundsieb
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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019033889A1 (fr) * 2017-08-17 2019-02-21 保定钞票纸业有限公司 Procédé de préparation de papier susceptible de réguler la luminosité de filigrane et produit de papier comprenant un filigrane à haute luminosité

Also Published As

Publication number Publication date
DE102016015336A1 (de) 2018-06-21

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