EP1891267B1 - 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 Download PDF

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Publication number
EP1891267B1
EP1891267B1 EP06755311.5A EP06755311A EP1891267B1 EP 1891267 B1 EP1891267 B1 EP 1891267B1 EP 06755311 A EP06755311 A EP 06755311A EP 1891267 B1 EP1891267 B1 EP 1891267B1
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EP
European Patent Office
Prior art keywords
paper
electrode
plasma
pressing device
produced
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EP06755311.5A
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German (de)
English (en)
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EP1891267A1 (fr
Inventor
Helmut Figalist
Werner Hartmann
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Siemens AG
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Siemens AG
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    • 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 manufacture of paper, cardboard or cardboard, wherein the press device is arranged downstream of a screening device and arranged in front of a drying plant.
  • the invention relates to a method for operating the press apparatus according to the invention in the compression of paper and / or removal of carrier liquid from wet paper, cardboard or paperboard in the manufacture of paper, paperboard or cardboard, wherein the press device downstream of a screening device and before a Drying system is arranged.
  • a paper manufacturing plant or in parts of a papermaking plant leaves a, usually still wet paper, cardboard or cardboard a screening area of the papermaking plant and from there into a press area of the papermaking plant. In the press area, the paper, cardboard or cardboard is drained.
  • the term paper or process material is used below to represent paper, cardboard or paperboard.
  • Paper fibers preferably consist of many 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.
  • 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 at least one first electrode, which is connected to a high-voltage pulse generator, is arranged in or under a pressing region of the press device, in / on the wet paper, cardboard or cardboard or in its immediate vicinity 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 generated at a distance of less than 20 cm, preferably less than 10 cm, preferably less than 5 cm from the still wet paper in the press apparatus.
  • a transport roller is prepared as a first electrode.
  • 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 is designed as a plate.
  • the targeted application of plasma to the paper is increased by one more time.
  • a further increase in strength is achieved by a means for introducing gas, in particular air or oxygen, preferably pure oxygen or oxygen with, for example, noble 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, noble gas as the carrier gas
  • the paper to be compacted is brought into contact with preferably non-thermal, large-area plasma under atmospheric pressure, the plasma is produced in the immediate vicinity of the paper or in the paper or in its immediate vicinity a gas discharge, in particular a corona discharge, is generated under atmospheric pressure.
  • 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 been found to be particularly advantageous, as will be described later.
  • 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 are instrumental in increasing, in particular, the bond strength of the fibers to one another, thereby increasing the tear strength of the paper and thus further increasing the processing speed.
  • a series of different oxidizing and functionalizing radicals are generated in a gaseous phase and used to treat the paper with radicals in the incompletely dried sheet, in the press apparatus or immediately thereafter.
  • this treatment should be used at a content of carrier liquid of 2% to more than 30%.
  • 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.
  • 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.
  • high electric fields are required. These high field strengths occur in particular at the head of so-called streamers.
  • Streamer 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.
  • 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 probably lies in the rapid transition from streamer to atmospheric pressure breakdown, especially in the presence of geometric irregularities on the paper surface, such as single fibers where the electric field is greatly exaggerated.
  • 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 impingement of the fiber suspension or pulp 39 on the screening device 9 to the finished paper 27, which is finally rolled out in a reel 15. 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 drain or be sucked off by means of several suction chamber regions 24.
  • 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.
  • 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 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.
  • the press device 11 is followed by a drying system 13.
  • the remaining residual water is evaporated in the drying plant 13.
  • Slalom-like, 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 large-volume plasma with a high power density is produced by superposing intensive, short-duration high-voltage pulses having a high pulse repetition rate of 1 kHz on a DC corona discharge.
  • a very homogeneous, large volume, high power density plasma is created between a first electrode 47 and a second electrode 48 without the plasma constrictions known in DC corona discharges.
  • a treatment of the fiber suspension 39 can also be carried out according to the method of the invention between the headbox 7 and the beginning region of the sieve device 9 with a first electrode 43 under the sieve device 9 and a second electrode 44 above the sieve device 9.
  • the electrodes 43 and 44 are arranged such that the surface-distributed fiber suspension 39 extends between the electrodes. 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. Here, a plasma density is homogeneously distributed over the treatment area which is covered by the electrodes 43 and 44.
  • a large-area plasma for the treatment of the paper web 27 is produced with the electrode system 47 and 48 in the press device 11 according to the invention.
  • 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. 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 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 radicals OH By direct treatment of the pulp fiber suspension 39 or 27 of the paper with the cold plasma in the suspension 39 or in the paper 27, the radicals OH, preferably -, HOO -, O, O 3 produced. Among other things, 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 ⁇ s between the electrodes 43 and 44.
  • 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 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.
  • a Pulp fiber suspension 39 is prepared in the arrangement.
  • the streamer formation is illustrated using the example of this arrangement.
  • 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 ⁇ 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 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 shows examples of electrode systems for generating corona discharges in preferably aqueous media.
  • FIG. 4 is a plate-plate arrangement of one first plate 70a as an electrode and a second plate 70b as an electrode.
  • 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 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 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 70 a which as High voltage electrode connected to the high voltage pulse generator -46 is centrally located 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.
  • FIG. 10 is that out FIG. 1 known schematic press apparatus 11 enlarged and shown in more detail.
  • the paper 27 is agitated via numerous transport rollers and rollers by the press device 11 and thereby increasingly dewatered and compacted.
  • the press apparatus On the exact function and operation of the press apparatus will not be discussed in more detail, since the person skilled in a press device without the electrode assembly according to the invention is known.
  • 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 as already described above.
  • the paper web 27 extends between the electrodes 47,48 and is treated on both sides with plasma.
  • the paper web 27 forms a dielectric barrier already described and can thus favor the streamer formation.
  • the electrode 12a is configured as a roller electrode, similar to the roller electrode in FIG FIG. 11 ,
  • the paper 27 is guided by the roller electrode 12a.
  • a plasma for the treatment of the paper 27 is generated by means of the high-voltage generator 46 connected to them.
  • the transport roller 12 represents the grounded counterelectrode 12a.
  • the paper 27 is guided by the transport roller 12 in a force-fit and form-locking manner.
  • a likewise grounded counter electrode 12c which follows the course of the transport roller 12 in a semicircular manner, is electrically connected in a manner not shown to the transport roller 12, in particular to the roller electrode 12a.
  • an electrode arrangement is formed with a constant spacing, in which the individual wires 12b to 12b n are arranged centrally.
  • the paper to be processed runs 27 and is thus applied to each of the arranged between the two electrodes 12a and 12c wires 12b to 12b n with plasma and / or gas discharge.
  • the arrangement is also referred to as a curved wire-plate arrangement which forms a plasma reactor.

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Claims (43)

  1. Dispositif ( 11 ) de compression pour la compression du papier et/ou pour le retrait de liquide entraîné du papier ( 27 ) humide, du carton épais ou du carton, lors de la fabrication du papier ( 27 ), du carton épais ou du carton, le dispositif ( 11 ) de compression étant monté en aval d'un dispositif ( 9 ) de tamisage et en amont d'une installation ( 13 ) de séchage,
    caractérisé en ce que, au-dessus, dans ou en dessous d'une zone de compression du dispositif ( 11 ) de compression, est montée au moins une première électrode ( 47 ), qui est reliée à un générateur ( 46 ) d'impulsions de haute tension, un plasma pouvant être produit dans/sur le papier ( 27 ) humide, le carton épais ou le carton ou dans son environnement immédiat.
  2. Dispositif ( 11 ) de compression suivant la revendication 1,
    caractérisé en ce qu'un rouleau ( 12 ) de transport est agencé en première électrode.
  3. Dispositif ( 11 ) de compression suivant la revendication 1 ou 2,
    caractérisé en ce qu'il y a au moins une deuxième électrode ( 48 ) pour la production de plasma.
  4. Dispositif ( 11 ) de compression suivant l'une des revendications 1 à 3,
    caractérisé en ce qu'au moins une électrode est constituée sous la forme d'une plaque ( 70a, 70b ).
  5. Dispositif ( 11 ) de compression suivant l'une des revendication 1 à 4,
    caractérisé en ce qu'au moins une électrode est conformée en fil ( 71 ).
  6. Dispositif ( 11 ) de compression suivant l'une des revendications 1 à 5,
    caractérisé en ce qu'au moins une électrode est constituée sous la forme d'un treillis en fil métallique, notamment sous la forme d'une grille ( 75a, 75b ) en fil métallique.
  7. Dispositif ( 11 ) de compression suivant l'une des revendications 1 à 6,
    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 ayant des barreaux circulaires et/ou des réglettes plates à angle droit ou se croisant de manière inclinée.
  8. Dispositif ( 11 ) de compression suivant l'une des revendications 1 à 7,
    caractérisé en ce qu'au moins une électrode a une pointe ou plusieurs pointes ( 73 ).
  9. Dispositif ( 11 ) de compression suivant l'une des revendications 1 à 8,
    caractérisé en ce que les électrodes sont disposées sous la forme d'au moins deux plaques ( 70a, 70b ) opposées, de préférence parallèles entre elles.
  10. Dispositif ( 11 ) de compression suivant l'une des revendications 1 à 9,
    caractérisé en ce que les électrodes sont disposées sous la forme d'au moins deux grilles ( 75a, 75b ) opposées, de préférence parallèles entre elles.
  11. Dispositif ( 11 ) de compression suivant l'une des revendications 1 à 10,
    caractérisé en ce que les électrodes sont disposées de manière à disposer, comme deuxième électrode, un fil ( 71 ) ou une grille ( 75a ) entre deux plaques ( 70d, 70e ), qui forment la première électrode et qui sont reliées entre elles par une liaison ( 70f ) de plaque.
  12. Dispositif ( 11 ) de compression suivant l'une des revendications 1 à 11,
    caractérisé par un moyen ( 81 ) d'introduction de gaz, notamment d'air ou d'oxygène, de préférence d'oxygène pur ou d'oxygène ayant par exemple du gaz rare comme gaz porteur, entre ou à proximité immédiate des électrodes ( 47, 48 ).
  13. Procédé pour faire fonctionner le dispositif de compression suivant l'invention lors de la compression de papier et/ou du retrait de liquide entraîné de papier ( 27 ) humide, de carton épais ou de carton, dans la fabrication du papier ( 27 ), du carton épais ou du carton, le dispositif ( 11 ) de compression étant monté en aval d'un dispositif ( 9 ) de tamisage et en amont d'une installation ( 13 ) de séchage,
    caractérisé en ce que l'on met le papier à comprimer en contact, sous la pression atmosphérique, avec un plasma de grande surface, de préférence non thermique, on produit le plasma à proximité immédiate du papier ou on produit, dans le papier ou dans son environnement immédiat, une décharge dans un gaz, notamment une décharge par effet couronne, sous la pression atmosphérique.
  14. Procédé suivant la revendication 13,
    caractérisé en ce que pour produire le plasma ou la décharge dans un gaz, on produit, entre les électrodes ( 43, 44 ), des impulsions ( 66, 67 ) de haute tension d'une durée ( 62 ) de moins de 10 µs.
  15. Procédé suivant l'une des revendications 13 ou 14,
    caractérisé en ce que l'on met le produit à traiter en contact des deux côtés avec le plasma ou on le traite au moyen d'une décharge dans un gaz.
  16. Procédé suivant l'une des revendications précédentes,
    caractérisé en ce que l'on produit le plasma ou la décharge dans un gaz dans le produit à traiter.
  17. Procédé suivant l'une des revendications précédentes,
    caractérisé en ce que la teneur en liquide entraîné, notamment en eau, du produit à traiter est comprise entre 2% et 85%, de préférence entre 10% et 80% et notamment entre 10% et 70%.
  18. Procédé suivant l'une des revendications 13 à 17,
    caractérisé en ce que l'on produit dans le plasma, au moyen de la décharge dans un gaz, des radicaux ( 59 ) qui agissent sur le produit à traiter.
  19. Procédé suivant la revendication 18,
    caractérisé en ce que, pour des types différents de produits à traiter dans une opération de fabrication de papier, de carton épais ou de carton, on utilise, en des stades de procédé différents, des radicaux ( 59 ) de types différents ou de compositions différentes.
  20. Procédé suivant la revendication 18 ou 19,
    caractérisé en ce que l'on soumet le produit à traiter, dans un stade d'un procédé de fabrication de papier ou de carton, à des radicaux ( 59 ) de types différents ou de compositions différentes, se succédant de préférence dans le temps.
  21. Procédé suivant la revendication 19 ou 20,
    caractérisé en ce que l'on choisit les stades du procédé parmi les stades suivants :
    - compression,
    - séchage,
    - lissage,
    - enroulement,
    - déroulement,
    - encollage, notamment avant un revêtement,
    - finissage, revêtement, satinage ou calandrage,
    - préparation d'impression, notamment après le calandrage,
  22. Procédé suivant l'une des revendications 18 à 21,
    caractérisé en ce que l'on produit, comme radicaux ( 59 ), de l'ozone ( O3 ), du peroxyde d'hydrogène ( ( H2O2 ), OH, HO2 et/ou HO2 -.
  23. Procédé suivant l'une des revendications 18 à 22,
    caractérisé en ce que l'on règle le taux 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 le taux ( 63 ) de répétition des impulsions ( 66, 67 ) de haute tension.
  24. Procédé suivant la revendication 23,
    caractérisé en ce que, pour se rendre maître et pour réguler le taux de production et/ou le type des radicaux ( 59 ) produits, on mesure une concentration des radicaux ( 59 ) produits.
  25. Procédé suivant la revendication 23 ou 24,
    caractérisé en ce que pour se rendre maître et pour réguler le taux de production ou la composition des radicaux ( 59 ) produits, on mesure une propriété du produit traité, de préférence une propriété qualitative, notamment son opacité, son éclat, sa blancheur, sa fluorescence ou son point de couleur.
  26. Procédé suivant l'une des revendications 24 ou 25,
    caractérisé en ce que l'on mesure la concentration ou la propriété « online ».
  27. Procédé suivant l'une des revendications 23 à 26,
    caractérisé en ce que, pour la régulation, on modifie l'amplitude ( U ) des impulsions ( 66, 67 ) de haute tension à taux ( 63 ) de répétition constant.
  28. Procédé suivant l'une des revendications 23 à 27,
    caractérisé en ce que, pour la régulation, on modifie le taux ( 63 ) de répétition des impulsions ( 66, 67 ) de haute tension à amplitude ( U ) constante.
  29. Procédé suivant l'une des revendications précédentes,
    caractérisé en ce que l'on utilise, sur la feuille comprimée, une durée ( 62 ) d'impulsion de haute tension de 100 ns à 1 µs.
  30. Procédé suivant l'une des revendications précédentes,
    caractérisé en ce que l'on envoie sur la feuille comprimée, dans la zone alimentée en plasma, de l'oxygène et/ou de la vapeur d'eau ayant une pression partielle augmentée par rapport aux conditions atmosphériques.
  31. Procédé suivant l'une des revendications précédentes,
    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 par effet couronne en tension continue.
  32. Procédé suivant l'une des revendications précédentes,
    caractérisé en ce que l'on utilise un taux ( 63 ) de répétition des impulsions compris entre 10 Hz et 5 kHz, notamment ou 10 kHz.
  33. Procédé suivant l'une des revendications précédentes,
    caractérisé en ce que l'on règle l'injection de puissances d'énergie électrique dans le plasma, d'une manière prépondérante par la régulation de l'amplitude ( U ) de la durée ( 62 ) des impulsions et du taux ( 63 ) de répétition des impulsions de haute tension superposées.
  34. Procédé suivant l'une des revendications précédentes,
    caractérisé en ce que l'on applique 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.
  35. Procédé suivant l'une des revendications précédentes,
    caractérisé en ce que l'on utilise des impulsions ( 66, 67 ) de haute tension d'une durée ( 62 ) de plus de 100 ns.
  36. Procédé suivant l'une des revendications précédentes,
    caractérisé en ce que l'on produit un plasma homogène de grand volume, ayant une grande densité de puissance, sans qu'il se produise des strictions de plasma ou des claquages.
  37. Procédé suivant l'une des revendications précédentes,
    caractérisé en ce que l'on utilise une tension en courant continu d'un niveau tel qu'il se forme, dans le plasma, une décharge à effet couronne en courant continu stable, seulement en liaison avec la superposition d'impulsions de haute tension.
  38. Procédé suivant l'une des revendications précédentes,
    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.
  39. Procédé suivant l'une des revendications précédentes,
    caractérisé en ce que l'amplitude totale utilisée ( tension en courant continu + amplitude des impulsions ) est supérieure à la tension statique de claquage de l'agencement d'électrodes.
  40. Procédé suivant l'une des revendications précédentes,
    caractérisé en ce que l'amplitude totale utilisée correspond du double au quintuple de la tension de claquage statique de l'agencement d'électrodes.
  41. Procédé suivant l'une des revendications précédentes,
    caractérisé en ce que l'amplitude ( U ) des impulsions de haute tension représente de 10% à 1000% de la tension en courant continu utilisée.
  42. Procédé suivant l'une des revendications précédentes,
    caractérisé en ce que l'on produit un courant gazeux perpendiculairement à l'agencement ( 43, 44 ) d'électrodes.
  43. Procédé suivant l'une des revendications précédentes,
    caractérisé en ce que l'on produit un courant gazeux parallèlement à l'agencement ( 43, 44 ) d'électrodes.
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 EP1891267A1 (fr) 2008-02-27
EP1891267B1 true EP1891267B1 (fr) 2014-03-19

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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

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WO2006134062A1 (fr) 2006-12-21
ES2455519T3 (es) 2014-04-15
EP1891267A1 (fr) 2008-02-27
DE102005049290A1 (de) 2006-12-28

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