EP1891267A1 - Dispositif de pressage destine a comprimer le papier et/ou a eliminer le liquide entraine du papier, et procede correspondant - Google Patents

Dispositif de pressage destine a comprimer le papier et/ou a eliminer le liquide entraine du papier, et procede correspondant

Info

Publication number
EP1891267A1
EP1891267A1 EP06755311A EP06755311A EP1891267A1 EP 1891267 A1 EP1891267 A1 EP 1891267A1 EP 06755311 A EP06755311 A EP 06755311A EP 06755311 A EP06755311 A EP 06755311A EP 1891267 A1 EP1891267 A1 EP 1891267A1
Authority
EP
European Patent Office
Prior art keywords
paper
electrode
plasma
generated
voltage
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
EP06755311A
Other languages
German (de)
English (en)
Other versions
EP1891267B1 (fr
Inventor
Helmut Figalist
Werner Hartmann
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP1891267A1 publication Critical patent/EP1891267A1/fr
Application granted granted Critical
Publication of EP1891267B1 publication Critical patent/EP1891267B1/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
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/04—Physical treatment, e.g. heating, irradiating

Definitions

  • the invention relates to a press device for compacting paper and / or for removing carrier liquid from wet paper, cardboard or cardboard in the production of paper, cardboard or cardboard.
  • the invention relates to a method for operating the press device according to the invention when compacting paper and / or removing carrier liquid from wet paper, cardboard or cardboard in the production of paper, cardboard or cardboard.
  • Paper fibers preferably consist of many cellulose chains with many OH groups.
  • the strength of the paper produced through intervening water molecules that the Fa ⁇ fibers connect to one another via hydrogen bonds.
  • the number of hydrogen bonds can be increased by compression or slight stretching.
  • WO 2004/101891 A1 discloses a method for treating paper with plasma.
  • DE 198 36 669 A1 discloses a process for surface pretreatment on solid dry paper.
  • the invention has for its object to provide an apparatus and a method to increase the processing speed in papermaking.
  • the device-related object is according to the invention, since ⁇ achieved by, a first electrode is arranged that over in or under a pressing area of the press device, at least, which is connected to a high voltage pulse generator, in / on the wet paper, paperboard or cardboard, or in his / its immediate environment a plasma can be generated.
  • the molecular structure of the paper surface or of the fibers is changed.
  • Treatment with plasma increases the strength of the "sheet" even before the first drying stage.
  • the plasma is preferably ⁇ cm at a distance of less than 20, preferably less than 10 cm, preferably less than 5 cm, generated by the still wet paper in the press device.
  • a transport roller is prepared as a first electrode.
  • ⁇ te preferably in cold plasma of the press apparatus by means of a transport roller more hydrogen bonds are formed than without the plasma treatment in the paper.
  • the strength of the paper in the press device therefore increases. Increasing the strength of the Paper reduces the risk of paper tears and thus opens up the possibility of increasing the processing speed of the paper production line.
  • At least one second electrode for plasma generation is present. Between the two electrodes, the plasma is generated, preferably as a corona discharge or a gas discharge. Due to this type of arrangement, the paper is guided between the two electrodes and can thus be treated specifically with plasma.
  • At least one electrode plate as taltet is advantageously at least one electrode plate as taltet.
  • the targeted application of plasma to the paper is increased by one more.
  • a further increase in strength is achieved by a means for introducing gas, in particular air or oxygen, preferably pure oxygen or oxygen with beispiels- as inert gas as a carrier gas, between or in the unstoffba ⁇ re near the electrodes.
  • gas in particular air or oxygen, preferably pure oxygen or oxygen with crizspiels- as inert gas as a carrier gas, between or in the unstoffba ⁇ re near the electrodes.
  • high-voltage pulses having a duration of less than 10 ⁇ s are generated between electrodes to produce the plasma or the gas discharge. The use of high-voltage pulses which have a duration of less than 10 microseconds, has - as will be described later - to be particularly advantageous ago ⁇ issued.
  • Radical can, inter alia, bleaching chemical reac tions ⁇ trigger, especially free oxygen 0, especially a hydroxyl radical OH, in particular ozone O 3, as well as free functional groups such as OH groups, COOH groups.
  • These functional groups are again instrumental in particular the bond strength of the company ⁇ fibers with each other to increase, thus increasing the tensile strength of the paper increases and thus the Swisssgeschwin ⁇ can be further increased speed.
  • this treatment is to be used in a content of Trä ⁇ ger gallkeit of 2% up to about 30%.
  • the strength of the paper, and hence the maximum possible operation speed is thus increased already before a Trock ⁇ incineration plant.
  • this type of treatment also bleaches the colored substances lying on the surface, for example the adhering lignin or dye residues are oxidatively decolorized.
  • Radicals are generated in gas discharges by the fact that high-energy electrons collide with molecules and thereby dissociate or excite them and thus lead to the formation of radicals. In the dissociation, radicals are released immediately, while in the excitation by subsequent radiant transitions UV light is generated, which in turn reacts with and preferably dissociates air and water molecules.
  • Be ⁇ range from about 5 eV (electron volts) to> 15 eV
  • high electric fields are needed. ⁇ strengthen this high field occur especially at the head of so-called streamers.
  • Streamer are discharge channels which are under construction and form due to the applied high external field strengths. A structure of such streamers takes place within less than 10 ns and then passes quickly into a ther ⁇ mical breakdown channel . Since no high-energy electrons are formed in a thermal breakdown channel, it is among other objectives, this thermal
  • the pulse duration is significantly shorter than it corresponds to a buildup time of a full breakdown in the respective Medi ⁇ um.
  • the distance between the electrodes and the paper and the properties of the paper is advantageously applied to the paper in terms of quality properties.
  • the use of such short high voltage pulses has proven to be particularly advantageous, whereas the use of radio frequency (RF) or microwave pulses or high voltage single pulses of more than 10 ⁇ s in duration, as described in WO 2004/101891 A1, far less efficient is. This is probably due to the rapid transition from streamer to atmospheric pressure, especially in the presence of geometric irregularities on the surface of the paper, such as single fibers, where the electric field is greatly exaggerated.
  • RF radio frequency
  • the paper web or the fiber suspension is located between the electrodes used for the streamer discharge, this is particularly advantageous because the paper or the fiber suspension thereby partially acts as a dielectric barrier.
  • the dielectric barrier makes it easier to control the transition from streamer to breakdown.
  • FIG 1 shows a schematic representation of a Toiletherstel ⁇ treatment plant with a screening device, a press device according to the invention and a finishing and / or drying plant
  • FIG 2 is a view (sectional) of an arrangement for Erzeu- supply of radicals in corona plasmas in pulp or
  • Air parallel plate or tube assembly with wire overlaid with pulsed high voltage
  • 3 shows a schematic representation of pulses for generating radicals in corona discharges in air or aqueous media using short (typically ⁇ 1 ⁇ s) high voltage pulses with high pulse repetition
  • FIG 4 to FIG 9 electrode assemblies and electrode systems for generating corona discharges plate plate, plate Wire Panel, Coaxial Wire Pipe, Tip Panel, Multiport Panel, Lattice Panel (Pipe), Lattice Grid Arrangements.
  • 10 shows a press device with electrode arrangements according to the invention for plasma treatment
  • FIG. 11 shows a transport roller as an electrode.
  • the papermaking plant 1 shows a schematic representation of a papermaking plant 1, as it is set in present-day paper mills turned ⁇ . Their construction and the combination of different aggregates are determined by the type of paper, board and paperboard types to be produced, as well as the raw materials used.
  • the papermaking plant 1 has a spatial extent of about 10 m in width and about 120 m in length. Per minute, the paper manufacturing facility ⁇ produced up to 1400 m of paper 27. It takes only we ⁇ nige seconds from the first impingement of the fiber suspension or the pulp 39 on the screening device 9 to the finished paper 27, which ultimately in a curl 15 being rolled up. Diluted with water at a ratio of 1: 100, the fibrous materials are applied together with auxiliaries to the sieve device 9 with the sieve 10.
  • the fibers are deposited on the screen 10 side by side and on each other.
  • the white water 23 can flow off or be sucked off by means of a plurality of suction chamber regions 24.
  • a gleichmä ⁇ lar fiber composite which is further dehydrated by mechanical pressure in a press device 11 and with the aid of steam heat.
  • the entire paper manufacturing process subdivided focused mainly in the areas Stoffaufbe ⁇ reitung, paper machine, finishing and equipment.
  • the headbox 7 of the papermaking plant 1 distributes the pulp suspension uniformly over the entire sieve ⁇ width.
  • the paper web 27 still contains about 80% water.
  • Another dewatering process is carried out by mechanical pressure in the press device 11.
  • the paper web 27 is guided by means of an absorbent endless felt cloth between rolls of steel, granite or hard rubber and thereby dehydrated.
  • the white water 23 taken up by the suction chamber region 24 is fed to a sorter 5 in part and returned to another part to a fabric scavenger 17.
  • To the press apparatus 11 joins ei ⁇ ne drying plant. 13
  • the remaining residual water is evaporated in the drying plant 13.
  • the paper web 27 passes through several steam-heated drying cylinders. In the end, the paper 27 has a residual moisture of a few percent.
  • the water vapor produced in the drying plant 13 is sucked off and fed into a heat recovery unit (not shown).
  • a high volume plasma with a high Leis ⁇ is generated in that a DC corona discharge intense, short duration high voltage pulses are superimposed by a hen HO- pulse repetition rate of 1 kHz tung density.
  • ser ⁇ operation of an extremely homogeneous, large-volume plasma with a high power density between a first electrode 47 and second electrode 48 is generated, without causing constriction to the known with DC corona discharge plasma.
  • Electrode 44 carried over the sieve 9.
  • the electrodes 43 and 44 are arranged such that the surface-distributed fiber suspension 39 between the electrodes running. So that a large-area plasma under atmospheric pressure in the immediate vicinity of the fiber suspension 39 can be produced for the treatment of the fiber suspension 39, the electrodes 43 and 44 are connected to a high-voltage pulse generator 46. With the help of this high-voltage pulse generator 46, a large-volume plasma is produced with a large cross section and with a high power density ⁇ between the electrodes 43 and 44th Here, a plasma density is homogeneously distributed over the treatment area which is covered by the electrodes 43 and 44.
  • the electrode system 47 and 48 in the press device 11 produce a large-area plasma for the treatment of the paper web 27.
  • the first electrode 47 in the press apparatus 11 is designed as a semicircular grid electrode. Due to the semicircular configuration of the electrode 47, it can follow the course of the paper web over a transport roller 12.
  • the second electrode 48 in the press device 11 is configured as a plate electrode and arranged such that the
  • Transport roller 12 between the electrodes 47 and 48 can be performed.
  • the plasma treatment area is flown via the gas distributor 81 with the gas line 80 with an oxygen-argon mixture. Hydroxyl radicals are particularly advantageously produced with the aid of the oxygen-argon mixture.
  • the pressing process compacts the paper structure, the strength is increased again and a surface quality is decisively influenced.
  • the molecular structure of the paper surface is changed further ⁇ ver.
  • printability is improved.
  • a streamer is a special form of a linearly moving plasma cloud or a development in the discharge channel, which forms due to the excited high external field strength ⁇ .
  • An assembly of such streamer takes place within less than 10 ns and merges very quickly into a thermal breakdown channel.
  • Vorbe ⁇ called arrangements of the electrode systems, wherein the Pa ⁇ pierbahn 27 between the electrodes used for streamer discharge electrodes is located is particularly advantageous because the paper 27 thereby partially fun ⁇ giert as a dielectric barrier, whereby the transition from the streamer to Suppress breakdown.
  • the radicals OH “ , HOO " , O, O 3 are preferably produced in the suspension 39 or in the paper 27.
  • these radicals trigger a bleaching chemical reaction.
  • the Hochtentsim ⁇ pulse generator 46 is operated such that it high voltage pulses with a duration of typically 1 microseconds between the
  • a necessary for the generation of radicals and ozone in the pulp fiber suspension DC voltage is about a few 10 kV to about 100 kV.
  • the high voltage pulses are superimposed on the DC voltage and thus form a total amplitude of typically about 100 kV.
  • the radicals are generated in situ.
  • large total amounts of radicals can be introduced into the suspension 39.
  • the high-voltage pulse generator is operated such that it generates high-voltage pulses with a duration of typically from 0.1 ⁇ s to a few ⁇ s.
  • FIG. 2 shows, as a further exemplary embodiment, a sectional view of an arrangement for generating radicals.
  • a high voltage electrode 50 is arranged ⁇ .
  • the outer jacket of the arrangement is prepared as a counter ⁇ electrode 51.
  • the arrangement contains a ne to be screened pulp fiber suspension 39.
  • the example of the ⁇ ser arrangement illustrates the stream Erbil extension.
  • a streamer 53 is shown between the electrodes 50 and 51.
  • Ra ⁇ cals are produced by streamers in that energy-rich electrons collide with molecules and these dissociate or excite.
  • radicals 59 are immediately released, while upon excitation by a subsequent radiant transition, UV light is generated. This generated UV light in turn reacts with water molecules and dissociates them.
  • the applied voltage waveform of the high tensioning ⁇ shown voltage pulses.
  • the abscissa shows the time in ms and the ordinate the voltage in kV. The units are chosen arbitrarily.
  • a level of typically about 100 kV DC voltage coincides with the abscissa shown.
  • the illustrated pulse voltage is thus superimposed on the DC voltage.
  • the pulses 66 and 67 have a pulse width 62 of less than 1 ⁇ s, wherein the individual pulses 66, 67 a steeply rising edge with a rise time 64 and a less steeply falling edge.
  • the pulse repetition time 63 is typically between 10 ⁇ s and 100 ms.
  • the individual pulses 66, 67 such total ⁇ amplitude that more than the predetermined DC voltage, a predetermined energy density is achieved.
  • the pulse rise time 64 is short in comparison to the pulse ⁇ fall time. Through such kind of pulses is achieved that electric breakdowns, which would lead spatial and time ⁇ disturbances in the homogeneous plasma density distribution, are avoided.
  • FIGS. 4 to 9 show examples of electrode systems for generating corona discharges in preferably aqueous media.
  • a plate-plate assembly of a first plate 70a as an electrode and a second plate 70b as an electrode.
  • the first plate 70a and the two ⁇ te plate 70b are arranged parallel to each other.
  • the first plate 70a forms the high voltage electrode and is connected to the high voltage pulse generator 46 via a high voltage cable.
  • the second plate 70b forms the counter electrode, and is available as a ground electrode to the high voltage pulse generator 46 in ⁇ compound.
  • FIG. 5 A corresponding arrangement with specially flat plate ⁇ electrodes is shown in FIG 5. Again there are two solid plate electrodes 70a and 70c at a fixed distance with a high voltage electrode 71 in the middle.
  • the high voltage electrode 71 is made of a solid wire and connected to the high voltage output of the high voltage pulse generator 46.
  • the grounded plates 70a, 70c are also in communication with the high voltage pulse generator.
  • FIG. 6 shows a wire-tube arrangement as an electrode system.
  • a cylindrical electrode 72 projects centrally a high ⁇ voltage electrode 71 inside.
  • As the high voltage electrode 71 ⁇ is implemented as a solid wire and connected to the high voltage pulse generator 46 in Fig. 5
  • the cylindrical shaped electrode 72 which is preferably configured as a braid Drahtge ⁇ is grounded and is connected to the high voltage pulse generator 46 in ⁇ compound.
  • FIG. 7 shows a tip-plate arrangement as an electrode system.
  • Three tips 73 are connected to the high voltage pulse generator 46 via a high voltage line.
  • the tips 73 are arranged at right angles to a grounded plate electrode 74.
  • the distance of the tip electrodes 73 to the plate electrode 74 is adjustable and can thus be adapted to different process conditions.
  • FIG. 8 shows an electrode system arrangement comprising 3 plates 70a, 70d and 70e.
  • the first plate 70 a which as High voltage electrode is connected to the high voltage pulse generator 46 is arranged centrally between two solid plates 7Od and 70e.
  • the plates 70a and 70b are connected via ei ⁇ nen plate connector 70f. Since the plate 70d as a grounded counter electrode is in communication with the high voltage pulse generator 46, the plate 70e above the plate connector 70f also functions as a grounded counter electrode.
  • FIG. 9 shows an electrode system as a grid-grid arrangement.
  • a first grid 75a and a second grid 75b are parallel here.
  • the first grid 75a forms the high voltage electrode and is connected to the high voltage pulse generator 46.
  • the second grid 75b forms the grounded counter electrode and communicates with the high voltage pulse generator 46.
  • a hybrid discharge, wherein one electrode fully ⁇ constantly suspension fiber is 75a outside of a to be treated 39 and a second electrode 75b fully or partially in the fiber suspension is immersed 39 is a al ⁇ ternatives arrangement in which the screen designed as an electrode 75a is generated.
  • the screen is designed as a Gitterelekt ⁇ rode and forms the high voltage electrode, which communicates with the high voltage pulse generator 46 in connection.
  • the grounded counter-electrode 76b is designed as a grid ⁇ electrode and communicates with the Hochwoodsimpulsge ⁇ generator 46 in connection.
  • FIG. 10 the schematic press apparatus 11 known from FIG. 1 is enlarged and shown in greater detail.
  • the Pa ⁇ pier 27 is passed over several rollers and rolls through the press device 11 while sert increasingly ent michs ⁇ and compacted.
  • the electrodes 47 and 48 which form a plasma reactor within the press device 11, are arranged.
  • the electrodes 47 and 48 are connected to the high voltage pulse generator 46.
  • a plasma is generated between the electrodes 47, 48.
  • the paper web 27 extends between the electrodes 47,48 and is treated on both sides with plasma.
  • the Pa ⁇ forms pierbahn 27 a previously described dielectric barrier and can thus favor the Stream Erbil extension.
  • a further electrode pair 12a and 47 ' is arranged on the output side.
  • the electrode 12a is configured as a Rollenelekt ⁇ rode, similar to the roller electrode in FIG 11.
  • the paper 27 is guided by the roller electrode 12a.
  • the electrode 47 ' is arranged at a distance of about 1 cm. Between the electrodes 47 'and 12a 46 a plasma for the treatment of the paper is evidence ER- 27 by means of the high voltage associated with them ⁇ generator.
  • the transport roller 12, the grounded counter electrode 12a Force and form fit, the paper 27 is guided by the transport roller 12.
  • a likewise grounded counter electrode 12c which follows the course of the semicircular feed roller 12 is, roll in a not shown way with the transport ⁇ 12, in particular with the roller electrode 12, electri- cally connected.
  • an electrode arrangement is formed with a constant spacing, in which the individual wires 12b to 12b n are arranged centrally.
  • each of the arranged between the two electrodes 12a and 12c wires 12b to 12b n with plasma and / pressurized gas discharges is also referred to as a curved wire-plate arrangement which forms a plasma reactor.

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  • Paper (AREA)

Abstract

Dispositif de pressage (11) destiné à comprimer le papier et/ou à éliminer le liquide entraîné du papier humide (27), du carton-pâte et du carton, lors de la fabrication du papier (27), du carton-pâte ou du carton. Dans le but d'augmenter la vitesse de traitement lors de la fabrication du papier, le dispositif de pressage est caractérisé en ce qu'il comprend une première électrode (47) disposée dans/ ou sous une zone de pressage, laquelle est connectée à un générateur d'impulsions haute tension (46), de manière à générer un plasma dans le papier/ou sur le papier humide (27), carton-pâte ou carton, ou dans son environnement immédiat. La résistance au déchirement et les propriétés qualitatives du papier (27) en sont améliorées.
EP06755311.5A 2005-06-16 2006-06-08 Dispositif de pressage destine a comprimer le papier et/ou a eliminer le liquide entraine du papier, et procede correspondant Not-in-force EP1891267B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102005028023 2005-06-16
DE102005049290A DE102005049290A1 (de) 2005-06-16 2005-10-14 Pressenvorrichtung zum Verdichten von Papier und/oder zum Entziehen von Trägerflüssigkeit aus Papier und Verfahren hierzu
PCT/EP2006/063007 WO2006134062A1 (fr) 2005-06-16 2006-06-08 Dispositif de pressage destine a comprimer le papier et/ou a eliminer le liquide entraine du papier, et procede correspondant

Publications (2)

Publication Number Publication Date
EP1891267A1 true EP1891267A1 (fr) 2008-02-27
EP1891267B1 EP1891267B1 (fr) 2014-03-19

Family

ID=36997581

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06755311.5A Not-in-force EP1891267B1 (fr) 2005-06-16 2006-06-08 Dispositif de pressage destine a comprimer le papier et/ou a eliminer le liquide entraine du papier, et procede correspondant

Country Status (4)

Country Link
EP (1) EP1891267B1 (fr)
DE (1) DE102005049290A1 (fr)
ES (1) ES2455519T3 (fr)
WO (1) WO2006134062A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011090121A1 (de) * 2011-12-29 2013-07-04 Siemens Aktiengesellschaft Ändern einer Formation von Papierfasern in einer Papierbahn

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI111475B (fi) * 1997-09-24 2003-07-31 Metso Paper Inc Menetelmä ja sovitelma sumun ja pölyn hallitsemiseksi paperin ja kartongin valmistuksessa ja jälkikäsittelyssä
DE19836669A1 (de) * 1998-08-13 2000-02-24 Kuesters Eduard Maschf Verfahren zur Oberflächen-Vorbehandlung von Papier oder Karton
SE513243C2 (sv) * 1998-12-11 2000-08-07 Sca Research Ab Förfarande för förhöjning av våtstyrkan hos ett tissuematerial samt tissuematerialet enligt förfarandet
EP1623072A1 (fr) * 2003-05-13 2006-02-08 Università Degli Studi Di Milano - Bicocca Procede de traitement au plasma du papier et du carton

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006134062A1 *

Also Published As

Publication number Publication date
EP1891267B1 (fr) 2014-03-19
WO2006134062A1 (fr) 2006-12-21
ES2455519T3 (es) 2014-04-15
DE102005049290A1 (de) 2006-12-28

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