EP0042497A1 - Method and apparatus for humidifying a web material - Google Patents

Method and apparatus for humidifying a web material Download PDF

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Publication number
EP0042497A1
EP0042497A1 EP81103964A EP81103964A EP0042497A1 EP 0042497 A1 EP0042497 A1 EP 0042497A1 EP 81103964 A EP81103964 A EP 81103964A EP 81103964 A EP81103964 A EP 81103964A EP 0042497 A1 EP0042497 A1 EP 0042497A1
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Prior art keywords
web
steam
temperature
medium
moistening
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EP81103964A
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German (de)
French (fr)
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EP0042497B1 (en
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Ralph Pagendarm
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G7/00—Damping devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/003—Indicating or regulating the moisture content of the layer

Definitions

  • the invention relates to a method and an apparatus for moistening a web by condensing the moistening medium on the web.
  • a method for moistening a web in which the web is guided through a space which is sealed off from the atmosphere, to which the pure moistening medium is fed at a saturated steam temperature above the temperature of the web and from which the excess of the moistening medium is removed again.
  • DE-OS 22 03 973 which describes the theoretical requirements of such a method in detail, also mentions the various parameters on which the dampening strength depends, namely web temperature, saturated steam temperature or dew point temperature of the dampening medium, inert gas content, and indicates that all of these In principle, parameters can be used for the control of the humidification level, the other parameters coming in as disturbance variables.
  • the invention therefore also assumes that the humidification chamber is connected to devices for supplying pure steam to the humidification medium, a device for regulating the web temperature depending on a device for measuring the web moisture being provided for regulating the dampening strength.
  • the moistening device should therefore give the possibility of moistening the web across its width to different extents. It must therefore also be regulated differently in some areas.
  • the aforementioned DE-OS 22 03 973 proposes a different temperature control of the web.
  • such a different temperature control in certain areas is difficult to achieve because, for example, cooling media with different cooling temperatures would then have to be used within a cooling roll.
  • a control device directed to different cooling areas of a cooling roll works sluggishly.
  • the invention is therefore based on the object of providing a method of the type mentioned at the outset and a device suitable for carrying it out, which permits wetting that differs in regions over the width of the web with easy controllability and low investment and operating costs.
  • the solution according to the invention is that the humidification medium is fed to the humidification chamber at locations distributed over the web width and inert gas is admixed to it each time it is fed in as a function of a moisture profile measurement.
  • the partial pressure as a whole would have to be substantially lower than the saturated steam pressure, because control movements in the direction of higher and lower partial pressure would have to be possible.
  • the addition of inert gas does not depend on the relative humidity of the treatment atmosphere, but on the moisture profile measurement of the web, which is more precise and quicker.
  • the invention thus differs by three features.
  • the degree of moistening is basically regulated by the temperature of the web.
  • the humidification atmosphere should be formed as much as possible from the pure vapor of the treatment medium.
  • the proportion of inert gas in the humidification atmosphere is not measured and regulated, but rather the moisture profile measurement of the web serves as a reference variable for the regulation.
  • the device for carrying out this method has a space through the web guide with sealing means at the web inlet and outlet openings, which is connected to devices for supplying pure steam of the humidifying medium and to a device for removing excess steam.
  • a device for regulating the web temperature as a function of a device for measuring the web moisture is provided.
  • this device is characterized in that a plurality of devices for supplying steam of the humidifying medium is provided over the width of the web and at least some of these supply devices are each connected to a device for admixing inert gas, which is dependent on the measurement result of a moisture profile measuring device can be regulated separately.
  • the space preferably contains walls to form a plurality of sections that are more or less separate from one another over the web width and to which steam feed devices are assigned.
  • the invention When the invention relates to a treatment room which is sealed off from the atmosphere, this means that blocking means are provided which prevent the penetration of considerable amounts of atmospheric gases, so that treatment with pure steam from the humidifying medium can take place. It is not necessary to prevent the wetting medium from escaping from the treatment room. - The removal of the treatment medium from the treatment room is only necessary insofar as a constant supply of new medium is to be guaranteed, so that the temperature of the treatment atmosphere remains at the desired value and, in the event of a partial pressure drop due to the addition of inert gas, a partial pressure increase by displacing the atmosphere with higher Inert gas proportion can take place. In some cases, the losses that occur due to leaks in the system to the outside can result in a sufficient removal of the treatment atmosphere.
  • a special suction device for example in connection with blocking nozzles as seals against the atmosphere. to be preferable.
  • the type of web temperature control generally does not play an important role for the invention. It can be done just as before as during the steam treatment. If one speaks of devices for supplying pure steam of the humidifying medium in connection with the treatment room, this does not mean that the steam must also reach the treatment room in a pure state in those cases in which the addition of inert gas is provided. Rather, it is preferred to add the inert gas to the steam flow before it has reached the treatment room, so that the gases mix intimately before being introduced into the treatment room.
  • the moisture profile measuring device can be provided before or after the humidification device. In the first fold, the moisture level is determined according to the results of the moisture profile measurement based on experience controls; in the other case there is real regulation with the aim of completely avoiding fluctuations in the moisture profile.
  • the type of moisture profile measuring devices used in connection with the invention is not important. They do not require any description in the present context, since suitable devices are familiar to the person skilled in the art.
  • the invention aims primarily at the treatment of cellulose webs (especially paper); however, it is not so limited.
  • the web 1 runs in the direction of the arrow over two rollers 2 and 3 in order to then be discharged at 4.
  • the rollers 2 and 3 are cooling rollers of adjustable temperature for regulating the dampening strength.
  • rollers 2 and 3 are covered in the area of the wrap angle of the web 1 by housings 5, which enclose the moistening atmosphere with the roller or web surface.
  • Housings 5 which enclose the moistening atmosphere with the roller or web surface.
  • Their structure, which is shown in more detail in FIG. 2, can be essentially the same for both rollers.
  • the roller temperature and the conditions of the moistening atmosphere in the two housings can be set differently for the purpose of different moistening of the two web sides.
  • the housing 5 encloses a treatment room 6 with the roller or web surface, which is sealed from the outside atmosphere by slot nozzles 7, some of which Curtain beam directed to the web surface, in order on the one hand the entry of atmospheric air into the treating - chamber 6 and to prevent the otherußrakeln the adherent air from the web surface and thus improve the mass transfer.
  • Outside the slot nozzles 7 there are suction slits 8 which are connected to a suction space 9 separate from the treatment space 6, which in turn is connected to a suction line 18 with a suction fan 19.
  • the suction through the slot 8 is set so strongly that losses of treatment medium to the outside are completely or essentially prevented.
  • the treatment room 6 has a steam supply device 10, which can be designed, for example, as a through slot opening parallel to the roll axis. It is connected to a steam line 11, which comes from a control valve 12 and possibly a heating register 13 for temperature control of the steam of an operating steam line 14 via a reducing valve 15. Another line 16 leads from line 11 via a control valve 17 to the blocking nozzles 7.
  • an air line 20 opens into the line 11, which comes from a compressed air source (not shown) via a control valve 21.
  • the setting of the control valve 21 is determined by a control device 25, which is dependent on the measurement result of the moisture profile measuring device 22, which determines the web moisture across the width of the web for each individual point or certain selected points.
  • the treatment room 6 of the housing 5 is divided by dashed walls 23 into a plurality of sections 24 across the web width, each of which is separately connected to the steam line 11 are.
  • the control valve 12 acts jointly on all sections 24, which is generally sufficient, but the control valves 21 are provided separately in the individual air lines 20 for each section so that the inert gas addition can be regulated separately for each individual section , according to the desired moisture profile of the web.

Abstract

1. A methof for humidifying a web by guiding the web through a chamber which is sealed from the atmosphere and to which he susbtantially pure humidifying medium is fed at a saturated-steam temperature that is above the temperature of the web and from which the excess is abducted, the web temperature for setting the humidification intensity being controllable in dependence on the web humidity, characterized in that the humidifying medium is fed to the chamber at points which are distributed over the web width and in that there is added thereto, during the feeding process, an inert gas in dependence on a humidity profile measurement.

Description

Die Erfindung bezieht sich auf ein Verfahren und eine Vorrichtung zum Befeuchten einer Bahn durch Kondensation des Befeuchtungsmediums auf der Bahn.The invention relates to a method and an apparatus for moistening a web by condensing the moistening medium on the web.

Bekannt ist ein Verfahren zum Befeuchten einer Bahn, bei dem die Bahn durch einen gegenüber der Atmosphäre abgedichteten Raum geführt wird, dem das reine Befeuchtungsmedium mit einer oberhalb der Temperatur der Bahn liegenden Sattdampftemperatur zugeführt wird und von dem der Überschuß des Befeuchtungsmediums wieder abgeführt wird. Die DE-OS 22 03 973, die die theoretischen Voraussetzungen eines solchen Verfahrens eingehend beschreibt, nennt auch die verschiedenen Parameter, von denen die Befeuchtungsstärke abhängt, nämlich Bahntemperatur, Sattdampftemperatur bzw. Taupunkttemperatur des Befeuchtungsmediums, Inertgasgehalt, und weist darauf hin, daß alle diese Parameter im Prinzip für die Regelung der-Befeuchtungsstärke verwendbar sind, wobei jeweils die anderen Parameter als Störgrößen eingehen. Sie bevorzugt die Regelung über die Bahntemperatur, um eine Befeuchtungsatmosphäre von reinem Befeuchtungsmedium verwenden zu können, weil ein Anteil von Inertgas im Befeuchtungsmedium den Stoffübergang auf die Bahn stark herabsetzt, was zur Einrichtung längerer Behandlungsstrecken zwingt und damit höhere Investitions÷ und Betriebskosten verursacht. Außerdem weiß man, daß es schwer ist, die relative Feuchte im Behandlungsraum rasch und genau zu regeln. Der Regelung über die Bahntemperatur ist daher sowohl im Hinblick auf die Wirtschaftlichkeit als auch auf die Genauigkeit des Verfahrens gegenüber der Regelung über die relative Feuchte der Befeuchtungsatmosphäre der Vorzug zu geben.A method for moistening a web is known, in which the web is guided through a space which is sealed off from the atmosphere, to which the pure moistening medium is fed at a saturated steam temperature above the temperature of the web and from which the excess of the moistening medium is removed again. DE-OS 22 03 973, which describes the theoretical requirements of such a method in detail, also mentions the various parameters on which the dampening strength depends, namely web temperature, saturated steam temperature or dew point temperature of the dampening medium, inert gas content, and indicates that all of these In principle, parameters can be used for the control of the humidification level, the other parameters coming in as disturbance variables. It prefers control over the web temperature in order to be able to use a humidification atmosphere of pure humidification medium because a proportion of inert gas in the humidification medium greatly reduces the mass transfer to the web, which forces the establishment of longer treatment sections and thus causes higher investment and operating costs. It is also known that it is difficult to control the relative humidity in the treatment room quickly and precisely. The control of the web temperature is therefore to be given preference over the control of the relative humidity of the humidification atmosphere, both in terms of economy and accuracy of the process.

Auch die Erfindung geht deshalb davon aus, daß der Befeuchtungsraum mit Einrichtungen zur Zuführung von reinem Dampf des Befeuchtungsmediums verbunden ist, wobei zur Regelung der Befeuchtungsstärke eine Einrichtung zur Regelung der Bahntemperatur in Abhängigkeit von einer Einrichtung zur Messung der Bahnfeuchte vorgesehen ist.The invention therefore also assumes that the humidification chamber is connected to devices for supplying pure steam to the humidification medium, a device for regulating the web temperature depending on a device for measuring the web moisture being provided for regulating the dampening strength.

Insbesondere in der Papierherstellung kann es vorkommen, daß die von der Papiermaschine ablaufende Bahn über die Breite ein unterschiedliches Feuchteprofil aufweist. Die Befeuchtungsvorrichtung soll daher die Möglichkeit geben, die Bahn übe- ihre Breite bereichsweise unterschiedlich stark zu befeuchten. Sie muß daher bereichsweise auch unterschiedlich regelbar sein. Die bereits erwähnte DE-OS 22 03 973 schlägt zu diesem Zweck eine bereichsweise unterschiedliche Temperierung der Bahn vor. Jedoch ist eine solche bereichsweise unterschiedliche Temperierung schwer zu erzielen, weil dann beispielsweise innerhalb einer Kühlwalze mit Kühlmedien unterschiedlicher Kühltemperatur gearbeitet werden müßte. Außerdem arbeitet eine auf bereichsweise unterschiedliche Kühlung einer Kühlwalze gerichtete Regeleinrichtung träge.In paper production in particular, it can happen that the web running off the paper machine has a different moisture profile over the width. The moistening device should therefore give the possibility of moistening the web across its width to different extents. It must therefore also be regulated differently in some areas. For this purpose, the aforementioned DE-OS 22 03 973 proposes a different temperature control of the web. However, such a different temperature control in certain areas is difficult to achieve because, for example, cooling media with different cooling temperatures would then have to be used within a cooling roll. In addition, a control device directed to different cooling areas of a cooling roll works sluggishly.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren der eingangs genannten Art sowie eine zu dessen Durchführung geeignete Vorrichtung zu schaffen, die über die Breite der Bahn eine bereichsweise unterschiedliche Befeuchtung bei leichter Regelbarkeit und geringen Investitions- und Betriebskosten gestattet.The invention is therefore based on the object of providing a method of the type mentioned at the outset and a device suitable for carrying it out, which permits wetting that differs in regions over the width of the web with easy controllability and low investment and operating costs.

Die erfindungsgemäße Lösung besteht darin, daß das Befeuchtungsmedium dem Befeuchtungsraum an über die Bahnbreite verteilten Stellen zugeführt wird und ihm jeweils bei der Zuführung in Abhängigkeit von einer Feuchteprofilmessung Inertgas zugemischt wird.The solution according to the invention is that the humidification medium is fed to the humidification chamber at locations distributed over the web width and inert gas is admixed to it each time it is fed in as a function of a moisture profile measurement.

Demnach wird ausgehend von dem Prinzip, daß die Befeuchtungsstärke durch die Bahntemperierung geregelt wird, damit .von den Vorzügen der Behandlung mit dem reinen Befeuchtungsmedium Gebrauch gemacht werden kann, ausgegangen, und es wird lediglich bereichsweise der Partialdruck des Befeuchtungsmediums durch Hinzufügung von .Inertgas ein wenig unter den Sattdampfdruck gesenkt. Diese Senkung ist geringfügig, weil/demjenigen Befeuchtungsbereich, in welchem die stärkste Befeuchtung verlangt wird, von der reinen Sattdampfbehandlung ausgegangen wird, so daß entsprechend der. Feuchteverteilung der Bahn auch in den übrigen Bereichen nur eine geringe Partialdrucksenkung erforderlich ist. Demgegenüber müßte in einem Verfahren, in welchem lediglich die relative Feuchte der Behandlungsatmosphäre zur Regelung der Befeuchtungsstärke verwendet wird, der Partialdruck insgesamt wesentlich niedriger als der Sattdampfdruck sein, weil Regelungsbewegungen sowohl in Richtung höheren als auch niedrigeren Partialdrucks möglich sein müßten. - Schließlich ist es ein wichtiges Merkmal der Erfindung, daß die Inertgaszugabe nicht abhängig von der relativen Feuchte der Behandlungsatmosphäre, sondern in Abhängigkeit von der Feuchteprofilmessung der Bahn erfolgt, was genauer und flinker ist.Accordingly, based on the principle that the humidification tung strength is controlled by the Bahntemperierung so .from the V orzügen treatment with the pure moistener, use can be made, it is considered, and it is only in regions of the partial pressure of the moistening by the addition of .Inertgas a little below the saturated vapor pressure is lowered. This reduction is slight because / that humidification area in which the most humidification is required is based on pure saturated steam treatment, so that according to the. Moisture distribution of the web is only necessary in the other areas, a slight reduction in partial pressure. In contrast, in a method in which only the relative humidity of the treatment atmosphere is used to regulate the degree of humidification, the partial pressure as a whole would have to be substantially lower than the saturated steam pressure, because control movements in the direction of higher and lower partial pressure would have to be possible. - Finally, it is an important feature of the invention that the addition of inert gas does not depend on the relative humidity of the treatment atmosphere, but on the moisture profile measurement of the web, which is more precise and quicker.

Gegenüber dem eingangs erwähnten, bekannten Vorschlag, dem- - - zufolge die Befeuchtungsstärke durch den Inertgasänteil, also die relative Feuchte, der Befeuchtungsatmosphäre, geregelt wird, unterscheidet sich die Erfindung somit durch drei Merkmale. Zum ersten wird daran festgehalten, daß die Befeuchtungsstärke grundsätzlich durch die Temperierung der Bahn geregelt wird. Zum zweiten soll die Befeuchtungsatmosphäre möglichst vom reinen Dampf des Behandlungsmediums gebildet werden. Und drittens wird nicht etwa, wie in dem bekannten Vorschlag vorgesehen, der Inertgasanteil in der Befeuchtungsatmosphäre gemessen und geregelt, sondern als Führungsgröße für die Regelung dient die Feuchteprofilmessung der Bahn.Compared to the known proposal mentioned at the outset, according to which the degree of humidification is regulated by the proportion of inert gas, that is to say the relative humidity, the humidification atmosphere, the invention thus differs by three features. First, it is maintained that the degree of moistening is basically regulated by the temperature of the web. Secondly, the humidification atmosphere should be formed as much as possible from the pure vapor of the treatment medium. And thirdly, as is the case in the known proposal, the proportion of inert gas in the humidification atmosphere is not measured and regulated, but rather the moisture profile measurement of the web serves as a reference variable for the regulation.

Die Vorrichtung zur Durchführung dieses Verfahrens weist einen von der Bahnführung durchlaufenen Raum mit Dichtungsmitteln an den Bahneintritts- und -austrittsöffnungen auf, der mit Einrichtungen zur Zuführung von reinem Dampf des Befeuchtungsmediums sowie mit einer Einrichtung zur Abführung von Dampfüberschuß verbunden ist. Dabei ist eine Einrichtung zur Regelung der Bahntemperatur in Abhängigkeit von einer Einrichtung zur Messung der Bahnfeuchte vorgesehen. Erfindungsgemäß zeichnet sich diese Vorrichtung dadurch aus, daß über die Breite der Bahn eine Mehrzahl von Einrichtungen zur Zuführung von Dampf des Befeuchtungsmediums vorgesehen ist und wenigstens einige dieser Zuführungseinrichtungen mit je einer Einrichtung zur Beimischung von Inertgas verbunden sind, die in Abhängigkeit von dem Meßergebnis einer Feuchteprofilmeßeinrichtung gesondert regelbar sind. Vorzugsweise enthält der Raum Wände zur Bildung einer Mehrzahl von voneinander mehr oder weniger getrennten Abschnitten über die Bahnbreite, denen jeweils Dampfzuführungseinrichtungen zugeordnet sind.The device for carrying out this method has a space through the web guide with sealing means at the web inlet and outlet openings, which is connected to devices for supplying pure steam of the humidifying medium and to a device for removing excess steam. A device for regulating the web temperature as a function of a device for measuring the web moisture is provided. According to the invention, this device is characterized in that a plurality of devices for supplying steam of the humidifying medium is provided over the width of the web and at least some of these supply devices are each connected to a device for admixing inert gas, which is dependent on the measurement result of a moisture profile measuring device can be regulated separately. The space preferably contains walls to form a plurality of sections that are more or less separate from one another over the web width and to which steam feed devices are assigned.

Wenn im Zusammenhang mit der Erfindung von einem gegenüber der Atmosphäre abgedichteten Behandlungsraum die Rede ist, so bedeutet dies, daß Sperrmittel vorgesehen sind, die das Eindringen von beachtlichen Mengen von atmosphärischen-Gasen verhindern, damit eine Behandlung mit reinem Dampf des Befeuchtungsmediums stattfinden kann. Es ist nicht erforderlich, daß der Austritt von Befeuchtungsmedium aus dem Behandlungsraum verhindert wird. - Die Abführung des Behandlungsmediums aus dem Behandlungsraum ist nur insoweit erforderlich, als dadurch eine ständige Zufuhr neuen Mediums gewährleistet bleiben soll, damit zum einen die Temperatur der Behandlungsatmosphäre auf dem gewünschten Wert verbleibt und damit zum anderen im Falle einer Partialdruckabsenkung durch Inertgasbeimischung anschließend wieder eine Partialdruckerhöhung durch Verdrängung der Atmosphäre mit höherem Inertgasanteil erfolgen kann. In manchen Fällen können schon die durch Undichtigkeiten des Systems nach außen hin stattfindenden Verluste eine ausreichende Abfuhr von Behandlungsatmosphäre bewirken. Im allgemeinen wird jedoch eine besondere Absaugeinrichtung, beispielsweise im Zusammenhang mit Sperrdüsen als Dichtungen gegenüber der Atmosphäre. vorzuziehen sein. - Die Art der Bahntemperierung spielt für die Erfindung im allgemeinen keine wesentliche Rolle. Sie kann ebensogut vor wie während der Dampfbehandlung erfolgen. - Wenn von Einrichtungen zur Zuführung von reinem Dampf des Befeuchtungsmediums in Verbindung mit dem Behandlungsraum gesprochen wird, so bedeutet dies nicht, daß der Dampf auch in denjenigen Fällen, in denen der Zusatz von Inertgas vorgesehen ist, den Behandlungsraum in reinem Zustand erreichen-muß. Bevorzugt wird vielmehr die Zugabe des Inertgases zum Dampfstrom, bevor er den Behandlungsraum erreicht hat, damit sich die Gase schon vor der Einführung in den Behandlungsraum innig vermischen. - Die Angabe, daß die Einrichtungen zur Dampfzufuhr mit je einer Einrichtung zur Beimischung von Inertgas verbunden sein soll, ist nicht im Sinne einer zahlenmäßigen Beschränkung der Inertgaszuführungseinrichtungen zu verstehen. - Die Wände zur Bildung von getrennten Abschnitten im Behandlungsraum sollen bewirken, daß die Behandlungsatmosphären mit gegebenenfalls unterschiedlichem Inertgasgehalt im wesentlichen getrennt bleiben. Eine völlig dichte Abtrennung ist nicht erforderlich. Von diesem Gesichtspunkt ist daher auch zu deuten, was im Sinne der Erfindung als Wand zu verstehen ist. Bevorzugt werden im allgemeinen feste Sperrflächen. Jedoch können diese auch flexibel sein oder beispielsweise durch Schlitzdüsenstrahlen ersetzt werden. Eine gewisse Durchmischung der Atmosphäre benachbarter Räume im Bereich der Wände ist im allgemeinen unschädlich und oftmals sogar zur Vermeidung scharfer Grenzen der Befeuchtungsstärke nützlich. - Die Feuchteprofilmeßeinrichtung kann vor oder nach der Befeuchtungseinrichtung vorgesehen sein. Im ersten FalZ wird die Befeuchtungsstärke entsprechend dem Ergebnis der Feuchteprofilmessung nach Erfahrungswerten gesteuert; im anderen Fall erfolgt eine echte Regelung mit dem Ziel, Schwankungen des Feuchteprofils gänzlich zu vermeiden. Auf die Art der im Zusammenhang mit der Erfindung verwendeten Feuchteprofilmessungseinrichtungen kommt es nicht an. Sie bedürfen im vorliegenen Zusammenhang auch keiner Beschreibung, da geeignete Geräte dem Fachmann geläufig sind. - Die Erfindung zielt in erster Linie auf die Behandlung von Cellulosebahnen (insbesondere Papier) ab; sie ist jedoch nicht darauf beschränkt.When the invention relates to a treatment room which is sealed off from the atmosphere, this means that blocking means are provided which prevent the penetration of considerable amounts of atmospheric gases, so that treatment with pure steam from the humidifying medium can take place. It is not necessary to prevent the wetting medium from escaping from the treatment room. - The removal of the treatment medium from the treatment room is only necessary insofar as a constant supply of new medium is to be guaranteed, so that the temperature of the treatment atmosphere remains at the desired value and, in the event of a partial pressure drop due to the addition of inert gas, a partial pressure increase by displacing the atmosphere with higher Inert gas proportion can take place. In some cases, the losses that occur due to leaks in the system to the outside can result in a sufficient removal of the treatment atmosphere. In general, however, a special suction device, for example in connection with blocking nozzles as seals against the atmosphere. to be preferable. - The type of web temperature control generally does not play an important role for the invention. It can be done just as before as during the steam treatment. If one speaks of devices for supplying pure steam of the humidifying medium in connection with the treatment room, this does not mean that the steam must also reach the treatment room in a pure state in those cases in which the addition of inert gas is provided. Rather, it is preferred to add the inert gas to the steam flow before it has reached the treatment room, so that the gases mix intimately before being introduced into the treatment room. - The statement that the devices for steam supply should each be connected to a device for admixing inert gas is not to be understood as a limitation of the number of inert gas supply devices. - The walls for forming separate sections in the treatment room are intended to ensure that the treatment atmospheres, which may have different inert gas contents, remain essentially separate. A completely tight separation is not necessary. From this point of view, it must therefore be interpreted what is to be understood as a wall in the sense of the invention. Fixed blocking areas are generally preferred. However, these can also be flexible or can be replaced, for example, by slot nozzle jets. A certain degree of mixing of the atmosphere of adjacent rooms in the area of the walls is generally harmless and often even useful for avoiding sharp limits on the degree of humidification. - The moisture profile measuring device can be provided before or after the humidification device. In the first fold, the moisture level is determined according to the results of the moisture profile measurement based on experience controls; in the other case there is real regulation with the aim of completely avoiding fluctuations in the moisture profile. The type of moisture profile measuring devices used in connection with the invention is not important. They do not require any description in the present context, since suitable devices are familiar to the person skilled in the art. - The invention aims primarily at the treatment of cellulose webs (especially paper); however, it is not so limited.

Die Erfindung wird im folgenden näher unter Bezugnahme auf die Zeichnung erläutert, die ein vorteilhaftes Ausführungsbeispiel schematisch veranschaulicht. Darin zeigen:

  • Fig. 1 die perspektivische Ansicht einer Befeuchtungsvorrichtung und
  • Fig. 2 einen schematischen Längsschnitt.
The invention is explained in more detail below with reference to the drawing, which schematically illustrates an advantageous embodiment. In it show:
  • Fig. 1 is a perspective view of a humidifier and
  • Fig. 2 shows a schematic longitudinal section.

Die Bahn 1 läuft in Pfeilrichtung über zwei Walzen 2 und 3, um anschließend bei 4 abgeführt zu werden. Die Walzen 2 und 3 sind Kühlwalzen regelbarer Temperatur zur Regelung der Befeuchtungsstärke.The web 1 runs in the direction of the arrow over two rollers 2 and 3 in order to then be discharged at 4. The rollers 2 and 3 are cooling rollers of adjustable temperature for regulating the dampening strength.

Die Walzen 2 und 3 sind im Bereich des Umschlingungswinkels der Bahn 1 von Gehäusen 5 abgedeckt, die die Befeuchtungsatmosphäre mit der Walzen- bzw. Bahnoberfläche einschließen. Ihr Aufbau, der sich näher aus Fig. 2 ergibt, kann bei beiden Walzen im wesentlichen gleich sein. Jedoch können die Walzentemperatur sowie die Bedingungen der Befeuchtungsatmosphäre in den beiden Gehäusen unterschiedlich eingestellt sein zum Zwecke unterschiedlicher Befeuchtung der beiden Bahnenseiten.The rollers 2 and 3 are covered in the area of the wrap angle of the web 1 by housings 5, which enclose the moistening atmosphere with the roller or web surface. Their structure, which is shown in more detail in FIG. 2, can be essentially the same for both rollers. However, the roller temperature and the conditions of the moistening atmosphere in the two housings can be set differently for the purpose of different moistening of the two web sides.

Das Gehäuse 5 schließt einen Behandlungsraum 6 mit der Walzen- bzw. Bahnoberfläche ein, der gegenüber der Außenatmosphäre durch Schlitzdüsen 7 abgedichtet ist, die einen Strahlvorhang auf die Bahnoberfläche richten, um zum einen den Eintritt von atmosphärischer Luft in den Behandlungs- raum 6 zu verhindern und um zum anderen die anhaftende Luft von der Bahnoberfläche abzurakeln und dadurch den Stoffübergang zu verbessern. Außerhalb der Schlitzdüsen 7 sind Absaugschlitze 8 vorgesehen, die mit einem von Behandlungsraum 6 gesonderten Saugraum 9 in Verbindung stehen, der seinerseits an eine Saugleitung 18 mit Saugventilator 19 angeschlossen ist. Die Absaugung durch den Schlitz 8 ist so stark eingestellt, daß Verluste von Behandlungsmedium nach außen gänzlich oder im wesentlichen verhindert werden.The housing 5 encloses a treatment room 6 with the roller or web surface, which is sealed from the outside atmosphere by slot nozzles 7, some of which Curtain beam directed to the web surface, in order on the one hand the entry of atmospheric air into the treating - chamber 6 and to prevent the other abzurakeln the adherent air from the web surface and thus improve the mass transfer. Outside the slot nozzles 7 there are suction slits 8 which are connected to a suction space 9 separate from the treatment space 6, which in turn is connected to a suction line 18 with a suction fan 19. The suction through the slot 8 is set so strongly that losses of treatment medium to the outside are completely or essentially prevented.

Der Behandlungsraum 6 weist eine Dampfzuführungseinrichtung 10 auf, die beispielsweise als zur Walzenachse parallele, durchgegende Schlitzöffnung ausgebildet sein kann. Sie ist an eine Dampfleitung 11 angeschlossen, die über ein Regelventil 12 und gegebenenfalls über ein Heizregister 13 zur Temperierung des Dampfes einer Betriebsdampfleitung 14 über ein Reduzierventil 15 herkommt. Von der Leitung 11 führt eine weitere Leitung 16 über ein Regelventil 17 zu den Sperrdüsen 7.The treatment room 6 has a steam supply device 10, which can be designed, for example, as a through slot opening parallel to the roll axis. It is connected to a steam line 11, which comes from a control valve 12 and possibly a heating register 13 for temperature control of the steam of an operating steam line 14 via a reducing valve 15. Another line 16 leads from line 11 via a control valve 17 to the blocking nozzles 7.

Kurz vor der Zuführungseinrichtung 10 mündet in die Leitung 11 eine Luftleitung 20,-die über ein Regelventil 21 von einer nicht dargestellten Druckluftquelle kommt. Die Einstellung des Regelventils 21 wird durch eine Regeleinrichtung 25 bestimmt, die von dem Meßergebnis der Feuchteprofilmeßeinrichtung 22 steht, die die Bahnfeuchte über die Breite der Bahn für jeden einzelnen Punkt oder bestimmte ausgewählte Punkte bestimmt.Shortly before the feed device 10, an air line 20 opens into the line 11, which comes from a compressed air source (not shown) via a control valve 21. The setting of the control valve 21 is determined by a control device 25, which is dependent on the measurement result of the moisture profile measuring device 22, which determines the web moisture across the width of the web for each individual point or certain selected points.

Wie man aus Fig. 1 erkennt, ist der Behandlungsraum 6 der Gehäuse 5 durch gestrichelt angedeutete Wände 23 in eine Mehrzahl von Abschnitten 24 über die Bahnbreite aufgeteilt, die jeweils gesondert an die Dampfleitung 11 angeschlossen sind. In dem dargestellten Beispiel ist vorgesehen, daß das Regelventil 12 auf sämtliche Abschnitte 24 gemeinsam wirkt, was im allgemeinen ausreicht, jedoch sind die Regelventile 21 in den einzelnen Luftleitungen 20 für jeden Abschnitt gesondert vorgesehen, damit die Inertgaszugabe für jeden einzelnen Abschnitt gesondert geregelt werden kann, entsprechend dem entsprechend gewünschten Feuchteprofil der Bahn.As can be seen from FIG. 1, the treatment room 6 of the housing 5 is divided by dashed walls 23 into a plurality of sections 24 across the web width, each of which is separately connected to the steam line 11 are. In the example shown it is provided that the control valve 12 acts jointly on all sections 24, which is generally sufficient, but the control valves 21 are provided separately in the individual air lines 20 for each section so that the inert gas addition can be regulated separately for each individual section , according to the desired moisture profile of the web.

Claims (3)

1. Verfahren zum Befeuchten einer Bahn durch Führen der Bahn durch einen gegenüber der Atmosphäre abgedichteten Raum, dem das reine Befeuchtungsmedium mit einer oberhalb der Temperatur der Bahn liegenden Sattdampftemperatur zugeführt wird und von dem der Überschuß wieder abgeführt wird, wobei die Bahntemperatur zur Einstellung der Befeuchtungsstärke in Abhängigkeit von der Bahnfeuchte regelbar ist, dadurch gekennzeichnet, daß das Befeuchtungsmedium dem -Raum an über die Bahnbreite verteilten Stellen zugeführt wird und ihm jeweils bei der Zuführung in Abhängigkeit von einer Feuchteprofilmessung Inertgas zugemischt wird.1. A method for moistening a web by guiding the web through a space sealed from the atmosphere, to which the pure moistening medium is fed with a saturated steam temperature above the temperature of the web and from which the excess is removed again, the web temperature being used to adjust the dampening strength can be regulated as a function of the web moisture, characterized in that the humidification medium is supplied to the space at locations distributed over the web width and inert gas is admixed to it in each case as a function of a moisture profile measurement. 2. Vorrichtung zum Befeuchten einer Bahn, die einen von der Bahnführung durchlaufenen Raum mit Dichtungsmitteln an den Bahneintritt- und -austrittsöffnungen, der mit Einrichtungen zur Zuführung von reinem Dampf des Befeuchtungsmediums sowie mit einer Einrichtung zur Abführung von Dampfüberschuß verbunden ist, sowie eine Einrichtung zur Regelung der Bahntemperatur in Abhängigkeit von einer Einrichtung zur Messung der Bahnfeuchte aufweist, dadurch gekennzeichnet, daß über die Breite der Bahn (1) eine Mehrzahl von Einrichtungen (10) zur Zuführung von Dampf des Befeuchtungsmediums vorgesehen ist und wenigstens einige dieser Zuführungseinrichtungen (10) mit je einer Einrichtung (20) zur Beimischung von Inertgas verbunden sind, die in Abhängigkeit von dem Meßergebnis einer nachgeschalteten Feuchteprofilmeßeinrichtung gesondert regelbar sind.2. Device for moistening a web, the space through which the web guide passes with sealing means at the web inlet and outlet openings, with devices for supplying pure steam of the moistening medium and with a device for discharging is connected to excess steam and has a device for regulating the web temperature as a function of a device for measuring the web moisture, characterized in that a plurality of devices (10) for supplying steam of the humidifying medium is provided over the width of the web (1) and at least some of these feed devices (10) are each connected to a device (20) for admixing inert gas, which can be regulated separately depending on the measurement result of a downstream moisture profile measuring device. 3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß der Raum (6) Wände (23) zur Bildung einer Mehrzahl von voneinander getrennten Abschnitten (24) aufweist, denen jeweils Dampfzuführungseinrichtungen (10) zugeordnet sind.3. Apparatus according to claim 2, characterized in that the space (6) has walls (23) to form a plurality of separate sections (24), each of which steam supply devices (10) are assigned.
EP81103964A 1980-06-24 1981-05-23 Method and apparatus for humidifying a web material Expired EP0042497B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3023536 1980-06-24
DE19803023536 DE3023536A1 (en) 1980-06-24 1980-06-24 METHOD AND DEVICE FOR MOISTURIZING A RAIL

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EP0042497A1 true EP0042497A1 (en) 1981-12-30
EP0042497B1 EP0042497B1 (en) 1984-08-15

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EP (1) EP0042497B1 (en)
DE (2) DE3023536A1 (en)
FI (1) FI70277C (en)

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US5755931A (en) * 1995-11-02 1998-05-26 Voith Sulzer Papiermaschinen Gmbh Method and apapratus for preserving a press roll jacket

Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
FI91900C (en) * 1990-12-17 1994-08-25 Valmet Paper Machinery Inc Process at the drying portion of a paper machine to reduce the curvature tendency and drying portion of the paper intended to carry out the procedure
DE19534573C2 (en) * 1995-09-18 2001-08-23 Voith Sulzer Papiermasch Gmbh Steam blower box and method for zone-wise tempering of a running paper web
DE102014103375B3 (en) * 2014-03-13 2015-08-20 Océ Printing Systems GmbH & Co. KG Method and device for printing on a substrate with adaptation of the electrical resistance of the printing substrate

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Publication number Priority date Publication date Assignee Title
FR1168513A (en) * 1956-01-26 1958-12-09 Method and device for adjusting the water content of endless belts made of fibrous materials
GB964123A (en) * 1962-04-27 1964-07-15 Greenbank Engineering Company Improvements in means for conditioning paper in web form
FR1457015A (en) * 1964-11-12 1966-10-28 Aschaffenburger Zellstoffwerke Device for obtaining a uniform humidity profile in the unwinding of paper and similar materials
DE2203973A1 (en) * 1972-01-28 1973-08-09 Erich Pagendarm Strip humification - by condensing humidifying medium on strip eg of paper

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1168513A (en) * 1956-01-26 1958-12-09 Method and device for adjusting the water content of endless belts made of fibrous materials
GB964123A (en) * 1962-04-27 1964-07-15 Greenbank Engineering Company Improvements in means for conditioning paper in web form
FR1457015A (en) * 1964-11-12 1966-10-28 Aschaffenburger Zellstoffwerke Device for obtaining a uniform humidity profile in the unwinding of paper and similar materials
DE2203973A1 (en) * 1972-01-28 1973-08-09 Erich Pagendarm Strip humification - by condensing humidifying medium on strip eg of paper

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5755931A (en) * 1995-11-02 1998-05-26 Voith Sulzer Papiermaschinen Gmbh Method and apapratus for preserving a press roll jacket

Also Published As

Publication number Publication date
FI70277C (en) 1986-09-15
EP0042497B1 (en) 1984-08-15
FI811838L (en) 1981-12-25
DE3023536A1 (en) 1982-01-14
DE3165541D1 (en) 1984-09-20
FI70277B (en) 1986-02-28

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