EP1896654B1 - 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 Download PDF

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Publication number
EP1896654B1
EP1896654B1 EP06777289A EP06777289A EP1896654B1 EP 1896654 B1 EP1896654 B1 EP 1896654B1 EP 06777289 A EP06777289 A EP 06777289A EP 06777289 A EP06777289 A EP 06777289A EP 1896654 B1 EP1896654 B1 EP 1896654B1
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EP
European Patent Office
Prior art keywords
suspension
plasma
electrode
high voltage
radicals
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Not-in-force
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EP06777289A
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German (de)
English (en)
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EP1896654A1 (fr
Inventor
Helmut Figalist
Werner Hartmann
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Siemens AG
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Siemens AG
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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
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    • 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

  • the invention relates to a screening device for removing carrier liquid from a fiber suspension in the production of paper, cardboard or cardboard.
  • the invention relates to a method for treating unwoven fibers in a suspension, in particular as pulp or pulp, while the suspension is screened or withdrawn from its carrier liquid, preferably for operation of the screening device according to the invention.
  • the fiber suspension leaves a headbox and passes from there to a, preferably revolving, sieve (wire or sieve cylinder).
  • a sieve wire or sieve cylinder
  • the sheet is dewatered to a dry content of preferably 16 to 25%.
  • the filtration is a sharp transition between an already formed fiber mat and the overlying fiber suspension.
  • the concentration of fibers increases steadily from top to bottom.
  • Strength of the leaf increases with increasing drainage.
  • Paper fibers preferably consist of numerous cellulose chains with many OH groups. The strength of the paper is created by intervening water molecules, which connect the fibers via hydrogen bonds. The number of hydrogen bonds can be increased by compression or slight stretching, e.g. in a press section.
  • 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 achieved according to the invention in that above, in or below a sieve region of the sieve device at least one first electrode is arranged, which is connected to a high-voltage pulse generator, wherein in the fiber suspension or in its immediate vicinity, a plasma generated is.
  • the fiber suspension is treated with plasma with advantage in view of the later material properties even before sheet formation has been completed.
  • the plasma is generated at a distance of less than 20 cm, preferably less than 10 cm, preferably less than 5 cm, from the fiber suspension.
  • the direct treatment of the fiber suspension preferably pulp fibers, with cold plasma are preferably generated in the gas space of the fiber suspension certain radicals. These radicals promote an increase in the strength of the paper.
  • a particularly advantageous embodiment of the invention is that a sieve is prepared as an electrode.
  • At least one second electrode for plasma generation is present.
  • An arrangement of at least two electrodes allows a two-sided treatment of the fiber suspension or of the non-pressed sheet.
  • the electrodes are arranged in the immediate vicinity of a suction chamber region, in particular a wet suction region or a flat suction region.
  • a suction chamber region in particular a wet suction region or a flat suction region.
  • first electrode and the second electrode are arranged in the immediate vicinity of the Saughunt Scheme that the fiber suspension is guided between the electrodes.
  • a two-sided treatment of the fiber suspension improves the treatment result, which is achieved by means of the screening device according to the invention.
  • the electrodes are prepared in such a way that a gas discharge through the electrodes or past the electrodes, in particular through the fiber suspension, is sucked.
  • the device can be designed 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
  • a carrier gas e.g. Argon
  • At least one electrode is designed as a plate.
  • an electrode arrangement with two plates can be used with advantage for a two-sided application of plasma to the suspension curtain.
  • the suspension is brought into contact with preferably non-thermal, large-area plasma under at least atmospheric pressure, that plasma is generated in the immediate vicinity of the suspension or in the suspension or in the immediate vicinity of the suspension, a gas discharge, in particular a corona discharge, is generated under at least atmospheric pressure.
  • Radicals may, inter alia, also trigger bleaching chemical reactions, in particular free oxygen O, in particular also a hydroxyl radical OH, in particular ozone O 3 , as well as free functional groups such as OH groups, COOH groups.
  • These functional groups play a key role, in particular in increasing the bonding strength of the fibers to one another, which further improves a tear resistance of the paper and thus the possible processing speed.
  • a series of differently oxidizing and functionalizing radicals are generated in a gaseous phase and used to treat these fibers with radicals in the non-pressed sheet, still on the wire, or immediately thereafter in the first part of a press section.
  • this treatment should be used at a content of carrier liquid of 75% to over 98%.
  • the strength of the paper and thus the maximum possible working speed is thereby increased at an early stage.
  • 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 high-energy electrons collide with molecules and thereby dissociate or excite them and so to the formation of radicals to lead. 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.
  • eV electron volts
  • UV light is generated, which in turn reacts with and preferably dissociates air and water molecules.
  • eV electron volts
  • streamers are discharge channels that are under construction and form due to the applied high external field strengths. An assembly of such streamer takes place within less than 10 ns and then rapidly merges into a thermal breakdown channel.
  • the pulse duration is significantly shorter than corresponds to a construction time of a complete breakdown in the respective medium.
  • the use of such short high voltage pulses has been found 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 in US Pat WO 2004/101891 A1 described, is far less efficient. The reason is probably a quick transition from one. Streamer for breakthrough at atmospheric pressure, in particular in the presence of geometric irregularities on the paper surface, such as individual fibers on which the electric field is greatly increased.
  • RF radio frequency
  • the paper web or the fiber suspension is located between the electrodes used for the streamer discharge, this is particularly advantageous since the paper or the fiber suspension thereby acts in part as a dielectric barrier.
  • the dielectric barrier makes it easier to control the transition from the streamer to the breakdown.
  • FIG. 1 shows a schematic representation of a papermaking plant 1, as used in today's paper mills. 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.
  • the papermaking plant produces up to 1400 m of paper per minute 27. It only takes a few seconds from the first impact of the fiber suspension or pulp 39 on the screening device 9 to the finished paper 27, which is finally rolled up in a reel 15. Diluted with water at a ratio of 1: 100, the fibrous materials 30 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 drain or be sucked off by means of several suction chamber regions 24. This results in a uniform fiber composite, which is further dehydrated by mechanical pressure in a press device 11 and with the aid of steam heat.
  • the entire papermaking process is essentially subdivided into the areas of stock preparation, paper machine, finishing and equipment.
  • 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. Waste paper and pulp 30 are also dissolved in a fiber trough 35 with the addition of water. 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 wire 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 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.
  • 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 formed in the drying plant 13 is sucked off and passed into a heat recovery system, not shown.
  • a first electrode 43 below the sieve device 9 and a second electrode 44 above the sieve device 9 are arranged between the headbox 7 and the beginning region of the sieve device 9 according to the invention.
  • the electrodes 43 and 44 are arranged such that the surface-distributed fiber suspension 39 extends between them. 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 aid of this high-voltage pulse generator 46, a large-volume plasma with a large cross section and with high power density is produced between the electrodes 43 and 44.
  • a plasma density is homogeneously distributed over the treatment area which is covered by the electrodes 43 and 44.
  • this Large-volume plasma with high power density generated by the fact that a DC corona discharge intensive, short-lasting high voltage pulses are superimposed with a high pulse repetition rate of typically about 1 kHz.
  • a very homogeneous, large-volume plasma with a high power density is produced without the plasma constrictions that are known in DC corona discharges.
  • oxygen with argon as the carrier gas is introduced into the treatment space between the electrodes 43 and 44 by means of a gas distributor 81.
  • Hydroxyl radicals are particularly advantageously produced with the aid of the oxygen-argon mixture. Hydroxyl radicals are particularly aggressive and oxidizing, thereby increased strength in the later sheet formation is achieved at the only a few seconds in the treatment area between the electrodes 43 and 44 lingering fiber suspension.
  • an electrode system 47, 48 in the press device 11 generates 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 can be guided between the electrodes 47 and 48.
  • the plasma treatment area is flown via the gas distributor 81 with the gas line 80 with an 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 further altered.
  • printability is improved.
  • a streamer is a special form of a linearly moving plasma cloud or a developing discharge channel that 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.
  • the aforementioned arrangements of the electrode systems, with the paper web 27 between the electrodes used for the streamer discharge, are particularly advantageous, as the paper 27 thereby partially acts as a dielectric barrier, thereby suppressing the transition from the streamer to the breakdown.
  • the radical OH in the suspension 39 is preferably, O, O 3 produced. In addition to an increase in strength, these radicals trigger a bleaching chemical reaction.
  • the high voltage pulse generator 46 is operated to generate high voltage pulses having a duration of typically 1 ⁇ sec. generated between the electrodes 43 and 44. A necessary for the generation of radicals and ozone in the pulp mill 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. By treating the pulp fiber suspension 39 with a cold electrical discharge, so the plasma, the radicals are generated in situ. Thus, large total amounts of radicals can be introduced into the suspension 39.
  • the high voltage pulse generator is operated to generate high voltage pulses having a duration of typically 0.1 ⁇ s to a few ⁇ s.
  • FIG. 2 shows as a further embodiment, a sectional view of an arrangement for generating radicals.
  • a high voltage electrode 50 is arranged in the center of the arrangement.
  • the outer jacket of the assembly is prepared as a counter electrode 51.
  • the arrangement contains a pulp fiber suspension 39 to be screened.
  • a streamer 53 is shown between the electrodes 50 and 51. Radicals are generated in streamers by high-energy electrons colliding with and dissociating or exciting molecules. Upon dissociation, 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.
  • FIG. 3 is the applied voltage waveform of the high voltage pulses shown.
  • a first pulse 66 and a second pulse 67 each having a pulse width 62, have a spacing of one pulse repetition time 63.
  • 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 have such a total amplitude that a predefined energy density is achieved beyond the predetermined direct voltage.
  • the pulse rise time 64 is short compared to the pulse fall time.
  • FIG. 4 to FIG. 9 show examples of electrode systems for generating corona discharges in preferably aqueous media.
  • a plate-and-plate arrangement of a first plate 70a as an electrode and a second plate 70b as an electrode is illustrated.
  • the first plate 70a and the second 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 connected as a grounded electrode to the high voltage pulse generator 46 in connection.
  • FIG. 5 A corresponding arrangement with specially flat plate electrodes is in FIG. 5 shown. 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 high-voltage electrode 71 projects centrally into a cylindrical electrode 72.
  • the high voltage electrode 71 is made as a solid wire and connected to the high voltage pulse generator 46.
  • the cylindrical electrode 72 which is preferably configured as a wire mesh, is grounded and communicates with the high voltage pulse generator 46.
  • FIG. 7 shows a tip-plate assembly as an electrode system.
  • Three tips 73 are over a high voltage line with the high voltage pulse generator 46 connected.
  • 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 thus can be adapted for different process conditions.
  • FIG. 8 shows an electrode system assembly 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 arranged centrally between two solid plates 70d and 70e.
  • the plates 70a and 70b are connected via a 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 Here, a first grid 75a and a second grid 75b are parallel to each other.
  • 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 an electrode 75a is located entirely outside a fiber suspension 39 to be treated and a second electrode 75b is wholly or partially immersed in the fiber suspension 39 is provided with an alternative arrangement in which the screen is configured as electrode 75a is generated.
  • the screen is designed as a grid electrode and forms the high voltage electrode which is connected to the high voltage pulse generator 46.
  • the grounded counter electrode 76 b is designed as a grid electrode and is in communication with the high voltage pulse generator 46.
  • a high-voltage electrode comprising a plurality of electrically connected rod electrodes is arranged in the near-surface gas space of the fiber suspension 39 such that their rods extend parallel to the surface.
  • a grounded counter electrode is designed as a solid plate and arranged in distributed over the entire surface equidistant distances from the high voltage electrode.

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  • Paper (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)

Claims (54)

  1. Dispositif ( 9 ) de tamisage pour retirer du liquide porteur d'une suspension ( 39 ) de fibres lors de la production de papier ( 27 ), de carton épais ou de carton,
    caractérisé en ce que, au-dessus, dans ou en dessous d'une partie de tamisage du dispositif ( 9 ) de tamisage, est disposée au moins une première électrode ( 43 ) qui est reliée à un générateur ( 46 ) d'impulsions de haute tension, un plasma pouvant être produit dans la suspension (39) de fibres ou dans son environnement immédiat.
  2. Dispositif ( 9 ) de tamisage suivant la revendication 1,
    caractérisé en ce que le plasma est produit à une distance plus petite que 20 cm, de préférence plus petite que 10 cm, de préférence plus petite que 5 cm, de la suspension ( 39 ) de fibres.
  3. Dispositif ( 9 ) de tamisage suivant la revendication 1 ou 2,
    caractérisé en ce qu'un tamis ( 10 ) est monté en tant que l'une des électrodes.
  4. Dispositif ( 9 ) de tamisage suivant l'une des revendications 1 à 3,
    caractérisé en ce qu'au moins une deuxième électrode ( 44 ) est présente pour la production du plasma.
  5. Dispositif ( 9 ) de tamisage suivant l'une des revendications 1 à 4,
    caractérisé en ce que les électrodes ( 43, 44 ) sont disposées à proximité immédiate d'une partie ( 24 ) formant chambre d'aspiration, notamment d'une partie d'aspiration en voie humide ou d'une partie d'aspiration plate.
  6. Dispositif ( 9 ) de tamisage suivant la revendication 5,
    caractérisé en ce que la première électrode ( 43 ) et la deuxième électrode ( 44 ) sont disposées à proximité immédiate de la partie ( 24 ) formant chambre d'aspiration de façon à ce que la suspension ( 39 ) de fibres passe entre les électrodes ( 43, 44 ).
  7. Dispositif ( 9 ) de tamisage suivant la revendication 5 ou 6,
    caractérisé en ce que les électrodes ( 43, 44 ) sont montées de façon à ce qu'une décharge dans un gaz puisse être aspirée par les électrodes ou en passant sur les électrodes, notamment en passant à travers la suspension ( 39 ) de fibres.
  8. Dispositif ( 9 ) de tamisage suivant l'une des revendications 1 à 7,
    caractérisé par un moyen ( 81 ) pour envoyer du gaz, notamment de l'air ou de l'oxygène, de préférence de l'oxygène pur ou de l'oxygène ayant par exemple un gaz rare comme gaz porteur, entre les électrodes ( 43, 44 ) ou dans leur proximité immédiate.
  9. Dispositif ( 9 ) de tamisage suivant l'une des revendications 1 à 8,
    caractérisé en ce qu'au moins une électrode est constituée sous la forme d'une plaque ( 70a, 70b ).
  10. Dispositif ( 9 ) de tamisage suivant l'une des revendications 1 à 9,
    caractérisé en ce qu'au moins une électrode est constituée sous la forme d'un filtre ( 71 ) métallique.
  11. Dispositif ( 9 ) de tamisage suivant l'une des revendications 1 à 10,
    caractérisé en ce qu'au moins une électrode est constituée sous la forme d'une toile métallique, notamment sous la forme d'une grille ( 75a, 75b ) en fil métallique.
  12. Dispositif ( 9 ) de tamisage suivant l'une des revendications 1 à 11,
    caractérisé en ce qu'au moins une électrode est constituée sous la forme d'une grille ( 75a, 75b ), notamment sous la forme d'un agencement de barrettes et/ou de réglettes plates s'entrecroisant à angle droit ou de manière inclinée, de préférence sous la forme d'un tamis ( 10 ).
  13. Dispositif ( 9 ) de tamisage suivant l'une des revendications 1 à 12,
    caractérisé en ce qu'au moins une électrode a une ou plusieurs pointes ( 73 ).
  14. Dispositif ( 9 ) de tamisage suivant l'une des revendications 4 à 13,
    caractérisé en ce que les électrodes sont disposées sous la forme d'au moins deux plaques ( 70a, 70b ) opposées l'une à l'autre en étant de préférence parallèles.
  15. Dispositif ( 9 ) de tamisage suivant l'une des revendications 4 à 14,
    caractérisé en ce que les électrodes sont disposées sous la forme d'au moins deux grilles ( 75a, 75b ) opposées, de préférence parallèles.
  16. Dispositif ( 9 ) de tamisage suivant l'une des revendications 3 à 15,
    caractérisé en ce que les électrodes sont disposées de façon à ce qu'entre deux plaques ( 70d, 70e ) reliées entre elles par au moins un organe ( 70f ) de liaison de plaque et formant les premières électrodes soit disposé un fil ( 71 ) métallique ou une grille ( 75a ) en tant que deuxième électrode.
  17. Procédé de traitement de matière fibreuse non entrelacée en une suspension, notamment sous forme de pâte ou de bouillie de fibres, tandis que l'on tamise la suspension ou que l'on en retire le liquide porteur, de préférence pour faire fonctionner le dispositif de tamisage suivant l'invention,
    caractérisé en ce que l'on met la suspension au moins sous la pression atmosphérique en contact avec un plasma de grande surface, de préférence non thermique, on produit le plasma à proximité immédiate de la suspension ou on produit sous au moins la pression atmosphérique une décharge dans un gaz, notamment une décharge à effet couronne dans la suspension ou dans l'environnement immédiat de la suspension.
  18. Procédé suivant la revendication 17,
    caractérisé en ce que l'on produit le plasma a une distance plus petite que 20 cm, de préférence plus petite que 10 cm, de préférence plus petite que 5 cm, de la suspension.
  19. Procédé suivant la revendication 17 ou 18,
    caractérisé en ce que la suspension convient pour la production de papier, de carton épais ou de carton.
  20. Procédé suivant l'une des revendications 17 à 19,
    caractérisé en ce que l'on utilise une feuille humide comme suspension.
  21. Procédé suivant l'une des revendications 17 à 20,
    caractérisé en ce que, pour produire le plasma ou la décharge dans un gaz entre des électrodes ( 43, 44 ), on produit des impulsions ( 66, 67 ) de haute tension d'une durée ( 62 ) de moins de 10 µs.
  22. Procédé suivant l'une des revendications 17 à 21,
    caractérisé en ce que l'on applique à la suspension le plasma ou la décharge dans un gaz avant et/ou pendant la formation de feuilles, notamment lors du passage à travers ou sur un dispositif ( 9 ) de tamisage.
  23. Procédé suivant l'une des revendications 17 à 22,
    caractérisé en ce que l'on met la suspension des deux côtés en contact avec le plasma ou on la traite au moyen de la décharge dans un gaz.
  24. Procédé suivant l'une des revendications 17 à 23,
    caractérisé en ce que l'on utilise le plasma ou la décharge dans un gaz pour blanchir le suspension, la pâte ( 39 ) ou la bouillie de fibres, notamment dans un cuiseur, dans un récipient ( 37 ) de blanchiment ou dans un conduit d'entrée.
  25. Procédé suivant l'une des revendications 17 à 24,
    caractérisé en ce que l'on met la suspension, la pâte ( 39 ) ou la bouillie de fibres en contact avec au moins une électrode pour la production du plasma ou de la décharge dans un gaz.
  26. Procédé suivant l'une des revendications 17 à 25,
    caractérisé en ce que l'on produit le plasma ou la décharge dans un gaz dans la suspension.
  27. Procédé suivant l'une des revendications 17 à 26,
    caractérisé en ce que la teneur en liquide porteur, notamment en eau, de la suspension est comprise entre 40 % et 99,9 %, de préférence entre 80 % et 98 % et notamment entre 85 % et 98 %.
  28. Procédé suivant l'une des revendications 17 à 27,
    caractérisé en ce que l'on produit dans le plasma ou au moyen de la décharge dans un gaz des radicaux ( 59 ) qui agissent sur la matière fibreuse.
  29. Procédé suivant la revendication 28,
    caractérisé en ce que l'on utilise pour des états différents de suspension dans un processus de production de papier, de carton épais ou de carton, notamment en des stades différents du processus, des radicaux de nature ou de composition différente.
  30. Procédé suivant la revendication 28 ou 29,
    caractérisé en ce que l'on soumet la suspension dans un stade de processus d'un processus de production de papier ou de carton à des radicaux ( 59 ) de nature ou de composition différente, de préférence d'une manière successive dans le temps.
  31. Procédé suivant l'une des revendications 28 à 30,
    caractérisé en ce que l'on produit comme radicaux ( 59 ) de l'ozone ( 03 ), du peroxyde d'hydrogène ( H2O2 ), des radicaux hydroxyles ( OH ), HO2 et/ou HO2 -.
  32. Procédé suivant l'une des revendications 28 à 31,
    caractérisé en ce que, lors du blanchiment, on applique dans la suspension ou dans la pâte ( 39 ) ou dans la bouillie de fibres le plasma ou la décharge dans un gaz de façon à former comme radicaux ( 59 ) de l'ozone ( 03 ) et/ou du peroxyde d'hydrogène ( H2O2 ) en quantité multipliée.
  33. Procédé suivant l'une des revendications 28 à 32,
    caractérisé en ce que, lors du tamisage et/ou dans la suspension ou la pâte ( 39 ) répartie en surface ou dans la bouillie de fibres ou dans la feuille qui se forme ou qui est formée mais qui n'est pas encore pressée, on applique la décharge dans un gaz de manière à former comme radicaux de façon multipliée des hydroxyles ( OH ), HO2 et/ou HO2 -.
  34. Procédé suivant l'une des revendications 28 à 33,
    caractérisé en ce que l'on règle une vitesse de production des radicaux ( 59 ) et/ou la composition des radicaux ( 59 ) produits en influant sur l'amplitude ( U ), la durée ( 62 ) d'impulsion et/ou la fréquence ( 63 ) de répétition des impulsions ( 66, 67 ) de haute tension.
  35. Procédé suivant la revendication 34,
    caractérisé en ce que, pour régler et réguler la vitesse de production et/ou la nature des radicaux ( 59 ) produits, on mesure une concentration des radicaux ( 59 ) produits.
  36. Procédé suivant la revendication 34 ou 35,
    caractérisé en ce que, pour régler et réguler la vitesse de production ou la composition des radicaux ( 59 ) produits, on mesure une propriété de la suspension, de préférence une propriété de qualité, notamment son opacité, son brillant, sa blancheur, sa fluorescence ou son point de couleur.
  37. Procédé suivant l'une des revendications 35 ou 36,
    caractérisé en ce que l'on mesure la concentration ou la propriété « en ligne ».
  38. Procédé suivant l'une des revendications 34 à 37,
    caractérisé en ce que, pour la régulation, on modifie l'amplitude ( U ) des impulsions ( 66, 67 ) de haute tension en maintenant constante la fréquence ( 63 ) de répétition.
  39. Procédé suivant l'une des revendications 34 à 38,
    caractérisé en ce que, pour la régulation, on modifie la fréquence ( 63 ) de répétition des impulsions ( 66, 67 ) de haute tension en maintenant l'amplitude ( U ) constante.
  40. Procédé suivant l'une des revendication 17 à 39,
    caractérisé en ce que l'on enrichit en oxygène dans la zone soumise au plasma la suspension, la pâte ( 39 ) ou la bouillie de fibres, de préférence pour le blanchiment.
  41. Procédé suivant l'une des revendications 34 à 40,
    caractérisé en ce que l'on utilise dans la suspension, dans la pâte ( 39 ) ou dans la bouillie de fibres, de préférence pour le blanchiment, une durée ( 62 ) des impulsions de haute tension de moins de 100 ns.
  42. Procédé suivant l'une des revendications 17 à 41,
    caractérisé en ce que l'on entoure d'une atmosphère enrichie en vapeur d'eau dans la zone soumise au plasma de la suspension, de la pâte ( 39 ) ou de la bouillie de fibres répartie à plat ou une feuille se formant ou formée mais pas encore pressée, notamment lors du tamisage.
  43. Procédé suivant l'une des revendications 34 à 42,
    caractérisé en ce que l'on utilise une durée ( 62 ) des impulsions de haute tension de 100 ns à 1 µs sur de la suspension, de la pâte ( 39 ) ou de la bouillie de fibres répartie à plat ou sur une feuille se formant ou formée mais pas encore pressée, notamment lors du tamisage.
  44. Procédé suivant l'une des revendications 34 à 43,
    caractérisé en ce que, pour de la suspension, de la pâte ( 39 ) ou de la bouillie de fibres répartie à plat ou pour une feuille se formant ou formée mais pas encore pressée, on applique aux électrodes, notamment lors du tamisage, une amplitude ( U ) de haute tension correspondant au moins à deux fois et de préférence au moins à trois fois une tension de coupure d'effet couronne.
  45. Procédé suivant l'une des revendications 34 à 44,
    caractérisé en ce que, pour la production du plasma ou de la décharge à effet couronne, on produit une décharge à effet couronne en tension continue et on superpose les impulsions ( 66, 67 ) de haute tension à la décharge à effet couronne à tension continue.
  46. Procédé suivant l'une des revendications 34 à 45,
    caractérisé en ce que l'on utilise une fréquence ( 63 ) de répétition des impulsions comprise entre 10 Hz et 5 kHz, notamment de 10 kHz.
  47. Procédé suivant l'une des revendications 34 à 46,
    caractérisé en ce que l'on règle l'injection d'énergie électrique dans le plasma d'une manière prépondérante en réglant l'amplitude ( U ), la durée ( 62 ) des impulsions et la fréquence ( 63 ) de répétition des impulsions de haute tension superposées.
  48. Procédé suivant l'une des revendications 21 à 47,
    caractérisé en ce que l'on utilise des impulsions ( 66, 67 ) de haute tension d'une durée ( 62 ) de moins de 3 µs, de préférence de moins de 1 µs, de préférence de moins de 500 ns.
  49. Procédé suivant l'une des revendications 21 à 48,
    caractérisé en ce que l'on produit un plasma homogène d'un grand volume et d'une grande densité de puissance sans qu'il se produise des constrictions de plasma ou des plaquages.
  50. Procédé suivant l'une des revendications 21 à 49,
    caractérisé en ce que l'on utilise une tension en courant continu d'un niveau tel qu'il ne se forme dans le plasma une décharge à effet couronne en courant continu stable qu'en liaison avec des impulsions de haute tension superposées.
  51. Procédé suivant la revendication 50,
    caractérisé en ce que la tension en courant continu utilisée est inférieure à celle pour un fonctionnement stable sans superposition d'impulsions de haute tension.
  52. Procédé suivant la revendication 50 ou 51,
    caractérisé en ce que l'amplitude globale utilisée ( tension en courant continu + amplitude d'impulsion ) est supérieure à la tension de plaquage statique du dispositif à électrode.
  53. Procédé suivant l'une des revendications 50 à 52,
    caractérisé en ce que l'amplitude totale utilisée correspond à deux à cinq fois la tension de plaquage statique du dispositif à électrode.
  54. Procédé suivant l'une des revendications 50 à 53,
    caractérisé en ce que l'amplitude ( U ) des impulsions de haute tension est comprise entre 10 % et 1 000 % de la tension en courant continu utilisée.
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 EP1896654A1 (fr) 2008-03-12
EP1896654B1 true EP1896654B1 (fr) 2008-10-29

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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)

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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)

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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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Publication number Publication date
ATE412799T1 (de) 2008-11-15
CN101198747A (zh) 2008-06-11
JP4699519B2 (ja) 2011-06-15
EP1896654A1 (fr) 2008-03-12
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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