EP1896654A1 - Dispositif de tamisage pour la fabrication du papier, et procede de traitement de matiere fibreuse a fibres non entrecroisees - Google Patents

Dispositif de tamisage pour la fabrication du papier, et procede de traitement de matiere fibreuse a fibres non entrecroisees

Info

Publication number
EP1896654A1
EP1896654A1 EP06777289A EP06777289A EP1896654A1 EP 1896654 A1 EP1896654 A1 EP 1896654A1 EP 06777289 A EP06777289 A EP 06777289A EP 06777289 A EP06777289 A EP 06777289A EP 1896654 A1 EP1896654 A1 EP 1896654A1
Authority
EP
European Patent Office
Prior art keywords
plasma
suspension
pulp
electrode
radicals
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
EP06777289A
Other languages
German (de)
English (en)
Other versions
EP1896654B1 (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
Priority claimed from DE102005049287A external-priority patent/DE102005049287A1/de
Priority claimed from DE102005049290A external-priority patent/DE102005049290A1/de
Application filed by Siemens AG filed Critical Siemens AG
Priority to PL06777289T priority Critical patent/PL1896654T3/pl
Publication of EP1896654A1 publication Critical patent/EP1896654A1/fr
Application granted granted Critical
Publication of EP1896654B1 publication Critical patent/EP1896654B1/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
    • 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
    • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod
    • D21H25/14—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod the body being a casting drum, a heated roll or a calender

Definitions

  • a particularly advantageous embodiment of the invention is that a sieve is prepared as an electrode. Corresponds preferably by treatment with cold plasma on the sieve are at an early stage in the sheet more hydrogen bonds ⁇ than without the plasma treatment. The strength of the sheet on the wire therefore continues to increase. The bre ⁇ ago reached strength of the sheet further reduces the risk of web breaks.
  • the device can be configured with a means for introducing gas, in particular air or oxygen, preferably pure oxygen or oxygen with, for example, inert gas as the carrier gas, between or in the immediate vicinity of the electrodes.
  • gas in particular air or oxygen, preferably pure oxygen or oxygen with, for example, inert gas as the carrier gas, between or in the immediate vicinity of the electrodes.
  • the suspension with preferably non-thermal, large-area plasma under at least atmospheric pressure in
  • a gas discharge in particular a corona discharge, is generated under at least atmospheric pressure.
  • Radical can, inter alia, bleaching chemical reac tions ⁇ trigger, in particular oxygen free 0, in particular 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, resulting in an ultimate tensile strength of the paper and therefore the possible certifiedsge ⁇ speed improved.
  • the pulse duration is significantly shorter than it corresponds to a buildup time of a full breakdown in the respective Medi ⁇ um.
  • 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. Due to the dielectric barrier, the transition from the streamer to the breakdown can be better controlled.
  • FIG 1 shows a schematic representation of a papermaking ⁇ plant with a screening device according to the invention, a press apparatus and a finishing and / or drying plant
  • FIG 2 is a view (sectional) of an arrangement for generation of free radicals in corona plasmas in pulp or air: parallel plate, or Pipe assembly with wire, which is superimposed on a pulsed high voltage
  • Waste paper and, as a rule, also pulp reach a paper mill in dry form, while pulp is normally produced in the same factory and pumped into the material center 3 as a fiber / water mixture, ie a suspension of unvarnished pulp. Paper and pulp 30 will also be dissolved by addition of water in a fiber trough 35 on ⁇ . Non-paper components are discharged via various sorting aggregates (not shown here). In the fabric center 3, depending on the desired type of paper, the mixture of different raw materials. Fillers and auxiliaries are also added here to improve paper quality and increase productivity.
  • the headbox 7 of the papermaking plant 1 distributes the pulp suspension uniformly over the entire sieve ⁇ width. At the end of the screening device 9, 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 received by the suction chamber section 24 is returned to a sorter 5 and to another part to a cloth catcher 17.
  • the press device 11 is followed by a drying system 13.
  • the remaining residual water is evaporated in the drying plant 13.
  • Slalom-like passes through the Pa ⁇ pierbahn 27 more steam-heated drying cylinders.
  • the paper 27 has a residual moisture of a few percent.
  • the resulting in the drying plant 13 water vapor is sucked out and rank ⁇ ge in a non-illustrated zones assure whatungsanla-.
  • the crimping process compresses the paper structure, the strength is further increased and the surface quality is influenced DEND ⁇ decisive.
  • the molecular structure of the paper surface is changed further ⁇ ver.
  • printability is improved.
  • FIG. 2 shows, as a further exemplary embodiment, a sectional representation 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.
  • a pulp fiber suspension 39 is screened.
  • Electrodes 50 and 51 a streamer 53 is shown.
  • Radika ⁇ le streamers are generated in the fact that high energy electrons collide with molecules and these dissociate or excite. Upon dissociation, radicals 59 are released immediately, while UV light is produced upon excitation by a subsequent radiant transition. 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 microseconds, wherein the individual pulses 66, 67 have a steeply rising edge with a rise time 64 and a less steeply sloping 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 compared to the pulse rate. 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.
  • FIG. 4 shows a plate-and-plate arrangement 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.
  • a high-voltage electrode 71 projects centrally into a cylindrical electrode 72.
  • bias electrode 71 constructed as a solid wire and connected to the high voltage pulse generator 46 in Fig. 5
  • the cylindrical electrode 72 which is preferably designed as a wire mesh, is grounded and is connected to the high voltage pulse generator 46 in connection.
  • FIG. 8 shows an electrode system arrangement comprising 3 plates 70a, 70d and 70e.
  • the first plate 70a which is connected as a high voltage electrode to the high voltage pulse generator 46, is centered between two solid plates
  • the plates 70d and 70e 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. Analogous to FIG. 4, a first grid 75a and a second grid 75b are parallel here.
  • 75 a 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 alter- tive arrangement in which the screen is designed as an electrode 75a.
  • 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 76 b is designed as a grid electrode and is connected to the Hochwoodsimpulsge ⁇ generator 46 in conjunction.
  • a further electrode arrangement is possible.
  • a high voltage electrode comprising meh ⁇ eral electrically interconnected rod electrodes is arranged in the near-surface gas space of the fiber suspension 39 such that their rods are parallel to the surface.
  • a grounded counter-electrode is executed as a solid plate ⁇ and arranged in distributed over the whole area equidistant distances to the high voltage electrode.

Landscapes

  • Paper (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
EP06777289A 2005-06-16 2006-06-08 Dispositif de tamisage pour la fabrication du papier, et procede de traitement de matiere fibreuse a fibres non entrecroisees Not-in-force EP1896654B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL06777289T PL1896654T3 (pl) 2005-06-16 2006-06-08 Urządzenie sitowe do wytwarzani papieru i sposób obróbki nietkanych substancji włóknistych

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102005028023 2005-06-16
DE102005049287A DE102005049287A1 (de) 2005-06-16 2005-10-14 Siebvorrichtung für die Herstellung von Papier und Verfahren zur Behandlung unverwobener Faserstoffe
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/EP2006/063025 WO2006134069A1 (fr) 2005-06-16 2006-06-08 Dispositif de tamisage pour la fabrication du papier, et procede de traitement de matiere fibreuse a fibres non entrecroisees

Publications (2)

Publication Number Publication Date
EP1896654A1 true EP1896654A1 (fr) 2008-03-12
EP1896654B1 EP1896654B1 (fr) 2008-10-29

Family

ID=36997758

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06777289A Not-in-force EP1896654B1 (fr) 2005-06-16 2006-06-08 Dispositif de tamisage pour la fabrication du papier, et procede de traitement de matiere fibreuse a fibres non entrecroisees

Country Status (10)

Country Link
US (1) US20080196854A1 (fr)
EP (1) EP1896654B1 (fr)
JP (1) JP4699519B2 (fr)
CN (1) CN101198747B (fr)
AT (1) ATE412799T1 (fr)
BR (1) BRPI0611762A2 (fr)
DE (1) DE502006001952D1 (fr)
ES (1) ES2313678T3 (fr)
PL (1) PL1896654T3 (fr)
WO (1) WO2006134069A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE530340C8 (sv) * 2006-03-10 2008-06-24 Tomas Jaernmark Anordning och metod i samband med fiberformning
GB201110282D0 (en) * 2011-06-17 2011-08-03 Linde Ag Device for providing a flow of plasma
DE102011088522B4 (de) * 2011-12-14 2014-05-15 Siemens Aktiengesellschaft Steuerung der Blattbildung in einem Papierherstellungsprozess
DE102011090121A1 (de) * 2011-12-29 2013-07-04 Siemens Aktiengesellschaft Ändern einer Formation von Papierfasern in einer Papierbahn
CN103052251A (zh) * 2012-12-07 2013-04-17 常州中科常泰等离子体科技有限公司 低真空状态下的冷等离子体辉光放电发生器

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US5362371A (en) * 1987-03-31 1994-11-08 Candor James T Apparatus and method for removing liquid from liquid bearing material
US5064515A (en) * 1987-07-17 1991-11-12 Battelle Memorial Institute Electrofilter apparatus and process for preventing filter fouling in crossflow filtration
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JPH11217800A (ja) * 1998-01-28 1999-08-10 Toppan Printing Co Ltd 機能紙およびその製造方法
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Also Published As

Publication number Publication date
ATE412799T1 (de) 2008-11-15
CN101198747A (zh) 2008-06-11
JP4699519B2 (ja) 2011-06-15
EP1896654B1 (fr) 2008-10-29
CN101198747B (zh) 2012-03-14
ES2313678T3 (es) 2009-03-01
BRPI0611762A2 (pt) 2010-09-28
JP2008544095A (ja) 2008-12-04
WO2006134069A1 (fr) 2006-12-21
PL1896654T3 (pl) 2009-04-30
US20080196854A1 (en) 2008-08-21
DE502006001952D1 (de) 2008-12-11

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