EP0815318B2 - Verfahren zur entwässerung einer bahn aus zellulosehaltigem material durch durchsaugen von heisser luft, vorrichtung zur durchführung des verfahrens und danach hergestelltes produkt - Google Patents

Verfahren zur entwässerung einer bahn aus zellulosehaltigem material durch durchsaugen von heisser luft, vorrichtung zur durchführung des verfahrens und danach hergestelltes produkt Download PDF

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Publication number
EP0815318B2
EP0815318B2 EP96908155A EP96908155A EP0815318B2 EP 0815318 B2 EP0815318 B2 EP 0815318B2 EP 96908155 A EP96908155 A EP 96908155A EP 96908155 A EP96908155 A EP 96908155A EP 0815318 B2 EP0815318 B2 EP 0815318B2
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EP
European Patent Office
Prior art keywords
air
sheet
approximately
dryness
dewatering
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EP96908155A
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English (en)
French (fr)
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EP0815318B1 (de
EP0815318A1 (de
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Paul Marchal
Claude Lesas
Jean Lehervet
Emmanuelle Kientz
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Essity Operations France SAS
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Georgia Pacific France SAS
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/20—Waste heat recovery
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/18—Drying webs by hot air
    • D21F5/182—Drying webs by hot air through perforated cylinders

Definitions

  • the invention relates to the spinning of a sheet of cellulosic material, particularly in the context of the manufacture of cellulose wadding or wadded fabric, ie a relatively low basis weight absorbent paper, generally creped , for sanitary or domestic use: toilet paper, towel, kitchen towel, etc.
  • a process for wringing the paper sheet carried out after the forming step but before the final drying.
  • the invention provides a spin at the same time by driving water in the liquid state and by evaporation resulting from the passage of a very large flow of hot air through the wet sheet conveyed by a permeable fabric.
  • the method is characterized in that the flow of air through is generated by a high vacuum, between 100 and 500 millibars and created under the web scrolling through a fixed surface, along with the hot air is brought to the free surface of the sheet.
  • the speed of the air is between 5 and 50 m / s.
  • the method of the invention makes it possible to raise the dryness rate of the wet sheet leaving the forming section from values of the order of 8 to 25% up to values of between 20% and 75%.
  • the dryness corresponds to the weight of the absolutely dry fibers compared to that of the wet fibers.
  • the final rate of dryness depends on the residence time of the sheet in the flow of hot air through. This residence time can vary from 1/1000 seconds to 3/10 seconds for given values of the intensity of the flow of through air and its temperature.
  • the final value of the dryness also depends, for a residence time fixed within the above limits, of the initial dryness of the sheet, the geometry of the surface traversed by the air, the flow rate of the air through which can be between 5 and 50 Nm3 / m 2 .s depending on the porosity of the sheet and the vacuum level, and also its dry and wet temperatures.
  • the air is at a dry temperature between 100 and 500 ° C.
  • the air is humid; and its wet temperature is between 50 and 90 ° C.
  • a part of the compressed air is evacuated, and a corresponding quantity is introduced into the circuit, in order to maintain the spinning air at a humid temperature of between 50 and 90 ° C.
  • the sheet is traversed by at least a second stream of hot air downstream of the first, the wet temperature is different, preferably lower.
  • This splitting in the machine direction of the flow of hot air through makes it possible to optimize the thermodynamic parameters of the airflow as a function of the evolution of the dryness of the sheet. Especially when the dryness exceeds 40%, the amount of moisture in the air can be lower.
  • the dryness of the sheet is increased after dewatering to a value of between about 35 and about 75%, preferably about 35 and approximately 50% by the high-vacuum dewatering means of the invention and then the sheet is dried by means of a Yankee type cylinder to a dryness of the order of 95%.
  • the mechanical pressing of the sheet, supported by a felt in a conventional machine is replaced by dewatering according to the invention while setting the latter so as to obtain the same degree of dryness. Thanks to this feature of the process, a sheet of paper having a higher bulk is obtained than in the case of a conventional machine, while maintaining intact the speed performance and therefore the capacity of the machine since the level of dryness of the incoming sheet in yankee is unchanged.
  • the high-vacuum dewatering of the invention is carried out to a dryness of between about 35 and about 75%.
  • conveying fabric being then a canvas of the type "marker”.
  • the sheet is then dried on a Yankee type cylinder.
  • marker fabric it is understood a fabric comprising a weaving structure with zones of high porosity and zones of low porosity disposed according to a geometric definition determined so that it induces in the sheet a heterogeneous structure comprising zones of different compaction by the very effect of the through air dewatering of the invention.
  • the dryness of the sheet, after spinning, is chosen between 35 and 75%, depending on the qualities desired for the bouffant but also for the strength of the sheet.
  • a marking effect is obtained. important that increases the volume of the leaf in the most porous areas, probably because of the high vacuum prevailing under the canvas. It is also surprisingly found that the vacuum has no detrimental effect on the appearance and formation of the sheet which is kept intact while the risk of bursting is a priori high.
  • the high vacuum squeezing of the invention is carried out to a dryness of between approximately 20 and approximately 45%, conveying fabric being then a canvas of the type "marker".
  • the sheet is then dried on the same fabric by means of a prior art through air dryer to a dryness of between about 50 and about 90% and finally by means of a Yankee cylinder with a crepe squeegee to a dryness of the order of 95%.
  • the dryness of the sheet after dewatering is increased from a value of between about 8 and about 30% to a value of between about 20 and about 45%, by said spinning method.
  • the conveyor belt then being a fabric of the "marking" type and in that then the same fabric is dried by at least one drying device of the air-passing type to a dryness of about 95 %.
  • At least a portion of the air supplying the distribution box is extracted from said through air type drying device.
  • At least part of the air supplying the distribution box is extracted from the drying hoods of the Yankee cylinder drying device.
  • metered quantities of water vapor are injected into the hot air flow before it passes through. of the sheet, particularly in the first of the spinning zones in the direction of travel of the sheet when the spinning process comprises several zones.
  • This injection is modulated so as to vary the moisture content of the air along the cross-direction of the sheet, the objective being to extract different amounts of water across the sheet. This accurately controls the moisture profile of the sheet after drying and its quality.
  • the invention also relates to a device for carrying out the method.
  • the device is defined in accordance with the features of claim 16.
  • the device also comprises an air / water separator allowing the air to be switched on by means of a compressor communicating with a heating means.
  • the compressor is likely to be driven by a gas turbine group whose exhaust gas is fed to a heat exchanger for heating the air flow from the compressor before its introduction into the distribution box.
  • the compressor may be composed of several compression units, and the group may also consist of several gas turbine units.
  • the subject of the invention is also a sheet of paper, especially a high-bulk paper manufactured according to the high-vacuum squeezing method.
  • the installation corresponding to the first embodiment for the production of absorbent paper with a basis weight of between 12 and 80 g / m 2 comprises in its wet part a section for forming the sheet which can be of any type known to man. of career.
  • it comprises a double fabric 11 and 12 between the convergent interval from which a jet of dough is injected from a headbox 13. After draining bringing the sheet to a dryness of 8 to 25%, this last is driven to a means 15 which ensures its transfer to a permeable canvas.
  • This fabric can be simple or "marker" type according to the manufacturing process that is implemented.
  • the wet sheet is conveyed to the dewatering device 16 from which it leaves freed, for the most part, its water.
  • the dryness rate of the sheet is then between 25 and 75%.
  • the fabric then drives it to a drying cylinder 18 provided with drying hoods of the type known as Yankee on which it is applied by means of a suitable adhesive.
  • the sheet passes under the drying hoods and is peeled off by means of a doctor blade so as to crepe it, as is well known.
  • the wiper device 16 consists of a rotating cylinder 19 mounted on a horizontal axis.
  • the surface of the cylinder is porous with a high opening rate.
  • An internal volume space 20, forming a recovery box is delimited by a fixed cover 21, covering a sector of the cylinder, and the complementary sector thereto. It is in communication via a conduit 22 with a vacuum source. It is also in communication, by the sector of its surface not closed by the cover 21, with one or more boxes 24 of hot air distribution which are arranged outside the cylinder and which have openings in the form of sectors of circle parallel to its wall. These openings are provided with means of equalizing the air flow, such as fins or other equivalent means, so that it approaches the sheet with a uniform speed over the entire surface.
  • the boxes 24 are supplied with hot air by a compressor 26 driven by a motor 27, for example electric.
  • the compressor can be of any suitable type, axial or centrifugal.
  • the air coming from the compressor is heated to the desired temperature by a heating means which in the example shown is a burner 28.
  • the duct 30 connecting the compressor to the burner 28 comprises a bypass 34 provided with a valve 31 controlling the air extraction from the circuit.
  • an opening 33 with variable rate air introduction means 32 makes it possible to compensate the air extracted by the opening 34, and to form a mixture with the residual compressed air, coming from the duct 30, before reheating thereof by the burner 28.
  • the quantities of fresh air and extracted air can be controlled by an appropriate control member according to the humidity rate of the air inside the chambers 24 Similarly a control loop controls the flow of fuel to the burner 28 as a function of the temperature of the air at the distribution boxes 24.
  • the duct 22 is connected to a separating apparatus 23 of the cyclone or other type so that water drops suspended in the air can be removed from the circuit.
  • This separator may be external to the wiper device as shown. However, it is also within the scope of the invention to achieve the separation water / air at the outlet of the air, immediately downstream of the wet sheet of paper, for example by means of baffles, provided with gutters, disposed across the flow in the input area of the enclosure 20. This embodiment is not shown. Water collected in the separator is pumped to atmospheric pressure. The dehumidified air leaving the separator is led to the inlet of the compressor 26 to be compressed again at a pressure slightly above atmospheric pressure, and used for spinning.
  • the dewatering device operates as follows: the wet sheet on the fabric 17 is driven around the cylinder 19 and passes under the hot air outlet nozzles of the caissons 24.
  • the strong depression prevailing in the enclosure generated by the suction of the compressor 26 and set to a value between 100 and 500 millibars, then forces the flow of air from the boxes to thus pass through the sheet at a high speed. This speed is preferably between 5 and 50 m / s.
  • the water is extracted from the sheet partly by evaporation, partly in the form of aerosols.
  • the separator was disposed at a distance from the well 20 selected so that water suspended in liquid air settles at its level before it evaporates into the air stream.
  • the saturated air, extracted under vacuum from the separator is compressed by the compressor at a pressure slightly above atmospheric pressure.
  • the temperature of the air at the outlet of the heater is set between 100 ° C. and 500 ° C., and its humid temperature is maintained between 50 ° C. and 90 ° C. by appropriately adjusting the quantity of air extracted from the heating circuit. and that of fresh air brought in 33.
  • each circuit comprising: a distribution box, a recovery box with its suction slot, a compression means and a means for reheating the air reintroduced into the distribution box.
  • the purpose is to allow the adjustment of the thermodynamic conditions of the air, in particular its wet temperature, by adjusting the individual fresh air introduction means to each loop.
  • the spinning fabric 17 which can be marking conveys the wet sheet. through a set of two fixed boxes 120 and 124: a sucking suction chamber 120 side spin screen which determines the suction surface through which the leaf is drained, and a box 124 hot air distribution located on the side of the wet sheet.
  • the two boxes are arranged at a short distance from each other.
  • the fabric 17 is guided in the gap thus formed between the two boxes so that the wet sheet is on the side of the box through which the hot air is brought.
  • the fabric is itself supported by rollers 121, for example, or slides on a plate provided with slots.
  • the air is brought to a speed of 5 to 50 m / s because of the depression prevailing in the casing 124, and passes successively through the wet sheet and the porous fabric from which it extracts the desired amount of moisture.
  • the drive of the compressor 26 is provided by a gas turbine unit 126.
  • a gas turbine unit 126 This comprises, in a manner known per se, a compressor 126 C whose rotor shaft is driven by a turbine 126 T placed in motion by the gases from a combustion chamber itself supplied with combustion air by the compressor.
  • the turbine also drives a shaft connected by a coupling to that of the compressor 26.
  • the gases from the turbine are at a sufficient temperature, of the order of 500 ° C, to serve as a heat source in the present spin device .
  • the means for heating the air coming from the compressor 26 is constituted by a heat exchanger 128.
  • FIG. 4 shows a fourth embodiment of the invention in which the path of the wet sheet is arranged between the high vacuum dewatering device 16 and the Yankee drying cylinder, at least a conventional through air type dryer 140 comprising a cylinder 142 rotatably mounted about a horizontal axis. Its wall is porous and supports the fabric 17. Air heated by a burner 146 is driven through the wet sheet applied to the fabric 17, by means of a circulation fan 144. In the feed circuit air dryer, there is provided a burner as is known.
  • the wet paper sheet is transferred from the forming fabric to the fabric 17, its dryness level is then between 8 and 30% approximately. It undergoes a high-vacuum squeezing through the device 16 of the invention from which it results with a degree of dryness of between 20 and 45%. It then passes into the dryer 140 where it undergoes drying increasing its dryness to a level between 50 and 90%. The sheet is then applied to a Yankee drying cylinder 18 where it is dried to a dryness of the order of 95%. The dried sheet is peeled off the cylinder by means of a crepe squeegee as is known when making a creped product.
  • FIG. 4 is a block diagram that does not represent all the elements necessary for operation in practice, such as in particular the use of additional systems or conveyor cloths.
  • the process was tested on a commercial paper towel sheet, made of cellulose wadding or creped wadding, such as that marketed under the trademark O'KAY. It was moistened by spraying measured quantities of water.
  • the pilot machine comprises a flat support, provided with a vacuum slot, on which moves an air permeable grid.
  • the speed of the gate can be set to a specified setpoint.
  • a heated air nozzle is disposed above the grid at the vacuum gap. The latter communicates with a vacuum source set at 250 mbar.
  • the supply air of the nozzle was at ambient conditions (20 ° C and 5 g of steam per kg of dry air)
  • the air was preheated to 200 ° C and highly humidified.
  • the measured wet temperature was 64 ° C (120 g of steam per kg of dry air).
  • Tests were carried out on a pilot paper machine of small width, comprising a training section with training cloth, a transfer means on a marker-type cloth, an airtraversant drying section which can be bypassed, a drying cylinder Yankee type with a transfer press.
  • a spinning / drying section in accordance with the invention, has been placed at the level of the marker fabric.
  • the entire device corresponded schematically to that of FIG.
  • Tissue paper production tests were carried out on the previous pilot paper machine with marker fabric. For these tests, the products manufactured had substantially all the same basis weight and fiber composition. They were all dried and creped on the yankee to the same dryness, 95%. The dryness at the yankee inlet and the bulk (cm3 / g) of the sheet after creping were measured.
  • Second series of tests (2) The spinning device of the invention alone was used, by adjusting the time and humidity parameters of the air so that the sheet has a dryness at the entry of the Yankee 50 %.
  • the method of the invention makes it possible to better conform the fibers to the geometry of the marker fabric because the fibers are warmer and therefore more flexible than in a vacuum box of the prior art of which the air is at room temperature.
  • the fibers are further dried more vigorously after being shaped by the high vacuum.
  • the structure is stabilized earlier with a lower average humidity.
  • the sheet can thus be bonded to the wall of the Yankee drying cylinder with a lower dryness than in the case of conventional through-air drying, obtaining the same swelling.
  • FIG. 9 shows the drying part of a paper machine, incorporating a conventional through air dryer 101, with a porous-wall rotary cylinder 102 and the air-blast hoods 103.
  • a wire 104 of the marker type, for example, supports the sheet from the forming section, and is driven through the dryer, around the cylinder. 102.
  • the suction slot is open on the side of the web 104 opposite the sheet.
  • the box 105 is in communication with a source of high vacuum, between 100 and 500 mbar.
  • the present return box is in communication, on the suction side, with a hot air distribution box 106.
  • the dry temperature of the The air is between 100 and 500 ° C. Its humid temperature is between 50 and 90 ° C.
  • the humidity level of this air is modulated in the cross direction. Indeed, as has been shown above, the efficiency of the water spinning liquid form of the sheet by the device is even higher than the moisture content carried by the air flow hot through is higher. This property is used to modulate the residual moisture profile of the sheet in the cross direction.
  • the well 106 has been divided into a large number of smaller, adjacent chambers 106 'by means of partition walls disposed across the well 106 at regular intervals.
  • a ramp 107 for steam injection preferably superheated, has been placed inside each box 106 '.
  • Each ramp is supplied with steam from a manifold via a valve 107 'whose opening is controlled according to the set value depending on the desired dryness for the corresponding area of the sheet.

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  • Paper (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Claims (22)

  1. Verfahren zum Entwässern einer Bahn aus zellulosehaltigem Material, insbesondere einer Bahn aus feuchtem Papier eines Flächengewichts im Trockenzustand zwischen 10 und 80 g/m2, das anfangs einen Trockengehalt zwischen ungefähr 8 und 30 %, beispielsweise nach einem Abtropfen auf dem Formatband (12) hat, welches darin besteht, dass diese Bahn auf einem permeablen Band (17, 104) abgelegt und durch mindestens einen Heißluftstrom hoher Geschwindigkeit geführt wird, dadurch gekennzeichnet, dass der Luftstrom eine Geschwindigkeit zwischen 5 und 50 m/s hat und durch einen Unterdruck von 100 bis 500 millibar unter dem Band erzeugt wird.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Luft eine
    Trockentemperatur zwischen 100 ° C und 500 ° C hat.
  3. Verfahren nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, dass die Luft eine Feuchtigkeitstemperatur zwischen 50 ° C und 90° C hat.
  4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Luftstrom in einem geschlossenen Kreis umläuft und dass er, nachdem er die Bahn durchquert hat, nacheinander:
    - durch einen Rücklaufkasten (20, 120, 105), der unter einem Unterdruck von 100 bis 500 mbar gehalten wird, gesammelt wird,
    - zu einem Abscheidermittel zum Abscheiden von Luft/Wasser (23) geführt wird, um suspendiertes Wasser zu entfernen,
    - auf einen Druck verdichtet wird, der größer als Atmosphärendruck ist,
    - auf eine Temperatur zwischen 100 ° C und 500 ° C erhitzt wird,
    - zu der Oberfläche der Bahn geführt wird, die von dem in Bewegung befindlichen permeablen Band (17, 104), den er durchströmt, getragen wird.
  5. Verfahren nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass ein Teil der verdichteten Luft nach außen abgezogen wird und eine entsprechende Menge in den Kreis eingeführt wird, um die in den Verteilerkasten eintretende Luft auf einer Feuchtigkeitstemperatur zwischen 50 und 90° C zu halten.
  6. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Bahn von mindestens einem zweiten Heißluftstrom stromab des ersten durchquert wird, dessen Feuchtigkeitstemperatur anders, vorzugsweise kleiner ist.
  7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass die beiden Luftströme Teil zweier getrennter geschlossener Kreise bilden, wobei jeder der Kreise die Verfahrensschritte gemäß Anspruch 4 umfassen und mindestens der erste Kreis ein Abscheidemittel zum Abscheiden von Luft/Wasser aufweist.
  8. Verfahren zum Herstellen einer Papierbahn mittels eines Entwässerungsverfahrens unter hohem Unterdruck nach den Ansprüchen 1 bis 7, dadurch gekennzeichnet, dass der Trockengehalt der Bahn nach dem Abtropfen von einem Wert zwischen ungefähr 8 und ungefähr 30 % auf einen Wert zwischen ungefähr 35 und ungefähr 75 %, vorzugsweise zwischen ungefähr 35 und ungefähr 50 % durch das Entwässerungsverfahren unter Hochvakuum erhöht wird und dass anschließend die Bahn mittels eines Zylinders vom Typ "Yankee" (18) bis auf einen Trockengehalt in der Größenordnung von 95 % getrocknet wird.
  9. Verfahren zum Herstellen einer Papierbahn mittels eines Entwässerungsverfahrens nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass der Trockengehalt der Bahn nach dem Abtropfen von einem Wert zwischen ungefähr 8 und ungefähr 30 % auf einen Wert zwischen ungefähr 35 und ungefähr 75 % durch das besagte Entwässerungsverfahren erhöht wird, wobei das Förderband (17) nun ein Band vom Typ "Marqueuse" ist, und dass anschließend die Bahn auf einem Zylinder vom Typ "Yankee" (18) auf einen Trockengehalt von 95 % getrocknet wird.
  10. Verfahren zum Herstellen einer Papierbahn mittels eines Entwässerungsverfahrens nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass der Trockengehalt der Bahn nach dem Abtropfen von einem Wert zwischen ungefähr 8 und ungefähr 30 % auf einen Wert zwischen ungefähr 20 und ungefähr 45 % durch das besagte Entwässerungsverfahren erhöht wird, wobei das Förderband (17, 104) nun ein Band vom Typ "Marqueuse" ist, und dass sie anschließend auf diesem Band durch mindestens eine Trocknervorrichtung vom Typ Durchströmluft (140, 101) auf einen Trockengehalt zwischen ungefähr 50 und ungefähr 90 % und anschließend auf einem Yankee-Zylinder (18), der einer Krepprakel zugeordnet ist, auf einen Trockengehalt in der Größenordnung von 95 % getrocknet wird.
  11. Verfahren zum Herstellen einer Papierbahn mittels eines Entwässerungsverfahrens nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass der Trockengehalt der Bahn nach dem Abtropfen von einem Wert zwischen ungefähr 8 und ungefähr 30 % auf einen Wert zwischen 20 und ungefähr 45 % durch dieses Entwässerungsverfahren getrocknet wird, wobei das Förderband (17, 104) nun ein Band vom Typ "Marqueuse" ist, und dass sie anschließend auf diesem Band durch mindestens eine Trocknervorrichtung vom Typ Durchströmluft (140, 101) auf einen Trockengehalt in der Größenordnung von 95 % getrocknet wird.
  12. Verfahren zum Herstellen einer Papierbahn nach Anspruch 10 oder 11, dadurch gekennzeichnet, dass ein Teil der Luft, mit der der Verteilerkasten beschickt wird, aus der Trocknervorrichtung vom Typ Durchströmluft (140, 101) abgezogen wird.
  13. Verfahren zum Herstellen einer Papierbahn nach einem der Ansprüche 8 bis 10, dadurch gekennzeichnet, dass mindestens ein Teil der Luft, mit der der Verteilerkasten beschickt wird, aus Trocknerhauben der Trocknervorrichtung mit Yankee-Zylinder (18) abgezogen wird.
  14. Verfahren zum Herstellen einer Papierbahn mittels eines Entwässerungsmittels nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, dass in den Heißluftstrom vor seinem Durchgang durch die Bahn abgemessene Mengen von Wasserdampf eingespritzt werden, die insbesondere in Querrichtung der Bahn moduliert werden, um die Feuchtigkeit des Heißluftstromes vor seinem Durchqueren der Bahn zu variieren.
  15. Verfahren nach den Ansprüchen 7 und 14, dadurch gekennzeichnet, dass der Dampf in den ersten Strom eingespritzt wird.
  16. Vorrichtung zum Entwässern einer Bahn aus feuchtem Papier eines Flächengewichts im Trockenzustand zwischen 10 und 80 g/m2, das anfangs einen Trockengehalt zwischen ungefähr 8 und ungefähr 30 % hat, dadurch gekennzeichnet, dass sie aufweist:
    - ein bewegliches permeables Band (17, 104) mit einer Seite zum Abstützen einer zu entwässernden Bahn,
    - einen Luftverteilerkasten (24, 124, 106) mit einer Lufteinlassleitung und einer Verteileröffnung, die der besagten Seite zugewandt ist,
    - ein Mittel (28, 128) zum Erhitzen der in die Lufteinlassleitung eingelassenen Luft,
    - einen Rückführkasten (20, 120, 105) zur Wiederaufnahme der aus dem Verteilerkasten ausgetretenen Luft, der gegenüber der besagten Seite angeordnet ist, mit mindestens einem Ansaugschlitz gegenüber der Verteileröffnung des Verteilerkastens,
    - ein Mittel zum Halten des Rückführkastens (20, 120, 105) auf einem Unterdruck von 100 bis 500 mbar, um einen Luftstrom zwischen dem Luftverteilerkasten und dem Rückführkasten zu erzeugen, mit einer Geschwindigkeit zwischen 5 und 50 m/s, wenn die Bahn von dem permeablen Band (17, 104) getragen wird.
  17. Vorrichtung nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass sie ferner aufweist:
    - einen Luft/Wasser-Abscheider (23), der mit dem Rückführkasten verbunden ist,
    - einen Luftverdichter (26), der mit dem Luft/Wasser-Abscheider verbunden ist,
    - ein Mittel (28) zum Erhitzen der Luft, die mit dem Verdichter (26) in Verbindung steht,
    - eine Leitung, die das Heizmittel mit dem Verteilerkasten verbindet,
    - ein Luftabsaugmittel (34), das mit dem Verdichter verbunden ist,
    - ein Luftzuführmittel (33), das mit dem Heizmittel verbunden ist.
  18. Vorrichtung nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass er eine Gasturbinengruppe (126) aufweist, die den Verdichter (26) antreibt, und dass das Heizmittel durch die Abgase dieser Gruppe gespeist wird.
  19. Vorrichtung nach Anspruch 17, dadurch gekennzeichnet, dass sie eine Gasturbinengruppe aufweist, die den Verdichter antreibt, und dass das Heizmittel von einem Wärmeübertrager (128) gebildet wird, der mit den Abgasen dieser Gruppe einerseits und mit dem von dem Verdichter abgegebenen Luftstrom andererseits in Verbindung steht.
  20. Vorrichtung nach einem der Ansprüche 16 bis 19, dadurch gekennzeichnet, dass sie mindestens zwei Kreise für die Entwässerungsluft mit Verteilerkästen für aufeinander folgende Bereiche aufweist, wobei mindestens der erste Kreis den einen Luft/Wasserabscheider enthaltenden ersten Bereich speist.
  21. Vorrichtung nach einem der Ansprüche 16 bis 20, dadurch gekennzeichnet, dass sie Dampfeinspritzmittel (107) aufweist, die im Inneren zumindest des ersten Verteilerkastens angeordnet sind.
  22. Vorrichtung nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass der Verteilerkasten (106) in mehrere Kammern (106) unterteilt ist, die in Querrichtung bezüglich der Maschinenrichtung angeordnet sind, wobei mindestens eine der Kammern ein Dampfeinspritzmittel aufweist.
EP96908155A 1995-03-20 1996-03-20 Verfahren zur entwässerung einer bahn aus zellulosehaltigem material durch durchsaugen von heisser luft, vorrichtung zur durchführung des verfahrens und danach hergestelltes produkt Expired - Lifetime EP0815318B2 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9503220A FR2732044B1 (fr) 1995-03-20 1995-03-20 Procede d'essorage d'une feuille de matiere cellulosique par air chaud traversant sous haut vide
FR9503220 1995-03-20
PCT/FR1996/000414 WO1996029467A1 (fr) 1995-03-20 1996-03-20 Procede d'essorage d'une feuille de matiere cellulosique par air chaud traversant sous haut vide, dispositif de mise en ×uvre du procede et produit obtenu

Publications (3)

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EP0815318A1 EP0815318A1 (de) 1998-01-07
EP0815318B1 EP0815318B1 (de) 2001-11-28
EP0815318B2 true EP0815318B2 (de) 2006-12-20

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EP96908155A Expired - Lifetime EP0815318B2 (de) 1995-03-20 1996-03-20 Verfahren zur entwässerung einer bahn aus zellulosehaltigem material durch durchsaugen von heisser luft, vorrichtung zur durchführung des verfahrens und danach hergestelltes produkt

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US (1) US5974691A (de)
EP (1) EP0815318B2 (de)
JP (1) JP4008026B2 (de)
AT (1) ATE209725T1 (de)
BR (1) BR9607865A (de)
CA (1) CA2202172C (de)
DE (1) DE69617406T3 (de)
EA (1) EA000216B1 (de)
ES (1) ES2168465T5 (de)
FR (1) FR2732044B1 (de)
PT (1) PT815318E (de)
WO (1) WO1996029467A1 (de)

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JPH11502270A (ja) 1999-02-23
DE69617406T2 (de) 2002-04-04
PT815318E (pt) 2002-05-31
ES2168465T5 (es) 2007-07-01
ES2168465T3 (es) 2002-06-16
EP0815318B1 (de) 2001-11-28
BR9607865A (pt) 1998-06-30
JP4008026B2 (ja) 2007-11-14
US5974691A (en) 1999-11-02
CA2202172C (fr) 2008-08-26
WO1996029467A1 (fr) 1996-09-26
CA2202172A1 (fr) 1996-09-26
FR2732044A1 (fr) 1996-09-27
DE69617406D1 (de) 2002-01-10
ATE209725T1 (de) 2001-12-15
EP0815318A1 (de) 1998-01-07
FR2732044B1 (fr) 1997-04-30
DE69617406T3 (de) 2007-06-14
EA000216B1 (ru) 1998-12-24
EA199700163A1 (ru) 1998-02-26

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