EP2877632A1 - Crible d'égouttage - Google Patents

Crible d'égouttage

Info

Publication number
EP2877632A1
EP2877632A1 EP13742395.0A EP13742395A EP2877632A1 EP 2877632 A1 EP2877632 A1 EP 2877632A1 EP 13742395 A EP13742395 A EP 13742395A EP 2877632 A1 EP2877632 A1 EP 2877632A1
Authority
EP
European Patent Office
Prior art keywords
well
paper
screen
hole
perforated
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
EP13742395.0A
Other languages
German (de)
English (en)
Other versions
EP2877632B1 (fr
Inventor
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 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.)
Filing date
Publication date
Application filed by Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
Publication of EP2877632A1 publication Critical patent/EP2877632A1/fr
Application granted granted Critical
Publication of EP2877632B1 publication Critical patent/EP2877632B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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 at least one hole, as well as a method for papermaking with such a dewatering screen.
  • the holes are already produced during papermaking, they may have characteristic irregularities in the edge region, which are produced by the irregular deposition of fibers in the edge region and by individual fibers protruding into the hole, as described for example in document WO 03/054297.
  • the invention has for its object to provide a dewatering screen of the type mentioned, which has the disadvantages of State of the art avoids.
  • the dewatering screen should enable a gentle and reliable production of paper with a hole.
  • a dewatering screen of the type mentioned at the beginning contains a carrier screen which has a cut-out in a partial area
  • the insert tile contains screen fabric, as well as arranged in the cut-out portion of the mesh fabric insertion plate for generating the at least one hole in the paper.
  • the insert tile contains a perforated, peripheral edge surface with a first level height and a cup enclosed by the edge surface, which has smooth, non-perforated cup walls and a cup base lowered relative to the first level height.
  • the paper web removed from the wire has a hole in the shape of the pot outline, which shows the irregularities of the margins which are characteristic for the production of holes during paper formation.
  • the well bottom is lowered to a second level height, which is between 1.5 mm and 2.5 mm below the first level. level height.
  • the term "below” designates the direction toward the expansion cylinder or the like in which a negative pressure prevails in papermaking and in the direction of which the paper pulp is pulled during papermaking.
  • the first level height is 1.5 mm to 2.5 mm above the second level height, so is further in the direction of the impacted with pulp surface of the dewatering screen.
  • the bottom of the well, as well as the wells is not perforated. This completely prevents sheet formation in the region of the bottom of the pot.
  • the bottom of the well is perforated.
  • the perforations of the base of the bowl and the edge surface can have the same shape and size, but the perforations of the base of the bowl can advantageously also be provided with large perforations whose area is more than twice the area of the perforations of the rim.
  • the smooth, non-perforated well wall are almost perpendicular to the bottom of the well and have, based on the bottom of the well, in particular a pitch angle between 90 ° and 115 °, preferably between 90 ° and 100 °.
  • the defined by the peripheral edge surface first level level is advantageously on the screen level of the top wire layer of the support wire, so that the insert plate fits smoothly into the surface of the support wire.
  • the cell walls pass over into a wall which runs around the base of the cell and projects beyond the edge surface.
  • the peripheral wall preferably projects beyond the edge surface by 0.3 mm to 1.5 mm, in particular by 0.5 mm to 1.2 mm, and preferably has a wall width of 0.1 mm to 2.5 mm, in particular 0, 5 mm to 2.0 mm.
  • cup shapes are largely freely selectable within the scope of the invention.
  • hole shapes in paper star-shaped, rectangular, polygonal or other geometric shapes may be used in addition to rounds. Even wells that create a hole in the form of a picture motif are conceivable. It can also be provided several holes in a security paper, which preferably have complementary or related forms.
  • the insert plate itself is preferably made of plastic, in particular of injection-molded plastic.
  • the perforations are advantageously introduced by laser loading in the insert platelets.
  • the described drainage screens may in particular be round screens.
  • the invention also includes a method for producing paper having at least one hole, wherein the paper deposition takes place on a dewatering screen of the type described above.
  • the method produces a hole with characteristic edge irregularities.
  • the paper is in particular security paper for the production of security and value documents, such as banknotes, checks, identity cards, certificates or the like.
  • the inventive design of a dewatering screen holes can be generated in the paper with a clean deckle edge.
  • the hole formation is very reliable and without load for the round screen, the dandy and the pick-up screen.
  • Position and position of the holes can be specified within the carrier screen with high accuracy.
  • the shape of the hole to be produced is almost arbitrary, since it is generated by the outline shape of the injection-molded lowered cup or the course of the cup walls.
  • the injection molding allows a great flexibility in the production of such wells and thus a high degree of design freedom in the design of the hole shapes.
  • FIG. 1 is a schematic representation of a banknote with an irregularly bounded hole, which is closed on one side by a film strip,
  • FIG. 3 shows the insert plate of the dewatering screen of FIG. 2 in a perspective view
  • FIG. 4 schematically shows the addition of paper pulp to the dewatering screen of FIG. 2 during sheet formation
  • Fig. 5 shows another embodiment of an inventive
  • Fig. 6 shows another embodiment of an inventive
  • FIG. 1 shows a schematic representation of a banknote 10 with a hole 12 which is closed on one side by a foil strip 16.
  • the film strip 16 has a security feature in the region of the hole 12, which is visible from both sides of the banknote 10 in the upward direction and optionally also in transmitted light.
  • the hole 12 was thereby produced during the production of the security paper used for the banknote 10 and has a fibrous, irregular edge 14.
  • Such an irregular rim 14 is characteristic of apertures already made in sheet formation and can not be subsequently produced by punching or cutting the paper.
  • a dewatering screen of the kind shown schematically in cross section in FIG. 2 is used according to the invention.
  • the Entskyssansssieb 20 includes a support 22, the mesh 24 in the embodiment of four Sieblagen 24- A, 24-B, 24-C and 24-D consists. Three of the four Siebelages 24-A, 24-B and 24-C are cut out in one section around a injection molded insert 30 record. Insertion plate 30 is shown in more detail in perspective view in FIG. 3, the cross-sectional view of FIG. 2 being along line II-II of FIG.
  • the injection-molded inserting plate 30 contains a peripheral edge surface 32 whose plane surface defines a first level height hi.
  • the level height h in this case corresponds to the screen level h s of the uppermost screen layer 24-A of the carrier screen 12, so that the insert plate 30 fits continuously into the screen surface.
  • the outer contour of the edge surface 32 is arbitrary but, for practical considerations, is generally rounded and more typically circular or oval.
  • the circumferential edge surface 32 encloses a cup 34 whose shape and size corresponds to the shape and size of the desired hole 12 in the security paper.
  • the well 34 contains a well bottom 36 at a lowered second level height h 2 , wherein the second level height h 2 with respect to the first level height hi and the sieve level h s usually by 1.5 mm to 2.5 mm and in the embodiment by 2, 0 mm is lowered. If an even deeper cup is desired, the fourth sieve 24-D of the carrier can also be cut out.
  • the edge surface 32 and the well bottom 36 are each provided with perforations 38, 38 ', which ensure the drainage of the deposited paper.
  • the dimensions of the perforations 38, 38 ' are chosen so small that they do not adhere to fibers in papermaking.
  • the diameter of the perforations 38, 38 ' is between 10 ⁇ to 750 ⁇ , preferably between 50 ⁇ and 250 ⁇ .
  • the perforations 38 'of the well base 36 and the perforations 38 of the edge surface 32 have the same shape and size.
  • the perforations 38, 38 ' may also differ, as illustrated, for example, in FIG. 6.
  • the bottom of the well 36 is surrounded by approximately vertical well walls 40 which are smooth and unperforated.
  • FIG. 4 schematically illustrates the attachment of pulp to the dewatering screen 20 of FIG. 2 during sheet formation.
  • paper pulp 52, 54 deposits.
  • the paper mass 54 deposited on the base 36 of the cup does not hang together with the paper mass 52 deposited on the edge surface 32 and the screen fabric 24 because of the smooth, non-perforated cup walls 40 separating the paper masses.
  • the paper mass 54 then remains on the bottom of the well 36, so that the paper web removed by the dewatering sieve 20 has a hole 12 in the shape of the cell contour and with characteristic irregularities in the edges (FIG. 1).
  • FIG. 5 shows a further embodiment of a dewatering screen 60 according to the invention, in which the bottom of the pot 62 of the cup 34 is non-porous. perforated. As a result, sheet formation in the area of the bottom of the pot 62 is completely prevented in papermaking.
  • the well bottom 72 of the well 34 is provided with perforations 74 twice as large as the area of the perforations 38 of the peripheral surface 32.
  • the well walls 76 are smooth and imperforate ,
  • no wall projecting beyond the edge surface 32 is provided, but rather, the cell walls 76 move continuously into the edge surface 32 at the first level height hi.
  • hole shapes other than rounds may also include star-shaped, rectangular, polygonal or other geometric shapes, or hole shapes that represent a motif. It can also be provided several holes in a security paper, which preferably have complementary or related forms.

Landscapes

  • Paper (AREA)

Abstract

L'invention concerne un crible d'égouttage (20) pour la fabrication de papier doté d'au moins un trou (12), comprenant un crible de support (22) qui contient une toile de criblage (24) découpée dans une zone partielle et une plaquette d'insertion (30) disposée dans la zone partielle découpée de la toile de criblage (24) pour produire ledit trou (12) dans le papier, la plaquette d'insertion (30) contenant une surface de bord (32) périphérique perforée (38) ayant une première hauteur de niveau et une alvéole (34) qui est entourée par la surface de bord et présente des parois (40) lisses, non perforées, et un fond (36) en contrebas par rapport à la première hauteur de niveau.
EP13742395.0A 2012-07-27 2013-07-23 Crible d'égouttage Not-in-force EP2877632B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201210014894 DE102012014894A1 (de) 2012-07-27 2012-07-27 Entwässerungssieb
PCT/EP2013/002185 WO2014015978A1 (fr) 2012-07-27 2013-07-23 Crible d'égouttage

Publications (2)

Publication Number Publication Date
EP2877632A1 true EP2877632A1 (fr) 2015-06-03
EP2877632B1 EP2877632B1 (fr) 2016-12-14

Family

ID=48900939

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13742395.0A Not-in-force EP2877632B1 (fr) 2012-07-27 2013-07-23 Crible d'égouttage

Country Status (5)

Country Link
EP (1) EP2877632B1 (fr)
CN (1) CN104379834B (fr)
DE (1) DE102012014894A1 (fr)
ES (1) ES2618727T3 (fr)
WO (1) WO2014015978A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012024014A1 (de) 2012-12-07 2014-06-26 Giesecke & Devrient Gmbh Vorrichtung zur Herstellung eines mehrlagigen Sicherheitspapiers mit Aussparungen
DE102014008752A1 (de) * 2014-06-12 2015-12-17 Giesecke & Devrient Gmbh Spritzgusswerkzeug und Prägestock zum Einsatz bei der Herstellung von Wasserzeichenpapier
GB2532082B (en) * 2014-11-10 2017-09-13 De La Rue Int Ltd Improvements in watermarking
GB2532084B (en) * 2014-11-10 2017-09-06 De La Rue Int Ltd Improvments in watermarking
DE102015000694A1 (de) * 2015-01-20 2016-07-21 Giesecke & Devrient Gmbh Datenträger mit einem Fenstersicherheitsfaden
DE102015000690A1 (de) * 2015-01-20 2016-07-21 Giesecke & Devrient Gmbh Datenträger mit einem Fenstersicherheitsfaden

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4314380B4 (de) * 1993-05-01 2009-08-06 Giesecke & Devrient Gmbh Sicherheitspapier und Verfahren zu seiner Herstellung
DE10145782A1 (de) * 2001-09-17 2003-04-10 Giesecke & Devrient Gmbh Papiersieb zur Erzeugung zweistufiger Wasserzeichen und Verfahren zu dessen Herstellung
DE10163381A1 (de) 2001-12-21 2003-07-03 Giesecke & Devrient Gmbh Sicherheitspapier sowie Verfahren und Vorrichtung zu seiner Herstellung
DE102005045566A1 (de) * 2005-03-23 2006-09-28 Giesecke & Devrient Gmbh Mehrlagiges Sicherheitspapier
DE102005032815A1 (de) * 2005-07-12 2007-01-18 Giesecke & Devrient Gmbh Verfahren zur Herstellung eines Sicherheitspapiers, Papiersieb und Formelement für Papiersieb
DE102006058513A1 (de) * 2006-12-12 2008-06-19 Giesecke & Devrient Gmbh Entwässerungssieb und Verfahren zu seiner Herstellung
CN101748660A (zh) * 2008-12-01 2010-06-23 中国印钞造币总公司 一种防伪水印纸及其制造方法
DE102011116605A1 (de) * 2011-10-21 2013-04-25 Giesecke & Devrient Gmbh Entwässerungssieb

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2014015978A1 *

Also Published As

Publication number Publication date
EP2877632B1 (fr) 2016-12-14
DE102012014894A1 (de) 2014-01-30
CN104379834B (zh) 2017-03-29
WO2014015978A1 (fr) 2014-01-30
ES2618727T3 (es) 2017-06-22
CN104379834A (zh) 2015-02-25

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