EP2169111B1 - Method and device for cleaning a moving fabric - Google Patents

Method and device for cleaning a moving fabric Download PDF

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Publication number
EP2169111B1
EP2169111B1 EP09170028A EP09170028A EP2169111B1 EP 2169111 B1 EP2169111 B1 EP 2169111B1 EP 09170028 A EP09170028 A EP 09170028A EP 09170028 A EP09170028 A EP 09170028A EP 2169111 B1 EP2169111 B1 EP 2169111B1
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EP
European Patent Office
Prior art keywords
cleaning
carbon dioxide
fabric web
woven
cleaning nozzle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
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EP09170028A
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German (de)
French (fr)
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EP2169111A1 (en
Inventor
Helmut Gutenberger
Leonardo Galli
Jordi Soler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Messer Austria GmbH
Messer Group GmbH
Messer Italia SpA
Original Assignee
Messer Austria GmbH
Messer Iberica de Gases SA
Messer Italia SpA
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Publication date
Application filed by Messer Austria GmbH, Messer Iberica de Gases SA, Messer Italia SpA filed Critical Messer Austria GmbH
Priority to PL09170028T priority Critical patent/PL2169111T3/en
Priority to SI200930165T priority patent/SI2169111T1/en
Publication of EP2169111A1 publication Critical patent/EP2169111A1/en
Application granted granted Critical
Publication of EP2169111B1 publication Critical patent/EP2169111B1/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/32—Washing wire-cloths or felts

Definitions

  • the invention relates to a method for cleaning a continuous fabric web according to claim 1 and to a device for cleaning a continuous fabric web according to claim 3.
  • document DE 101 44 574 A1 discloses a method for cleaning a circulating fabric web with a cleaning medium, wherein a medium jet emerging from at least one cleaning nozzle is directed onto the fabric web.
  • the cleaning medium is dry ice from carbon dioxide, which is metered in the form of pellets from a reservoir in a gas stream and passed through a nozzle on the fabric web. Forming gaseous carbon dioxide is at least partially collected by a collecting device.
  • the object of the invention is to provide a method and a device for cleaning a rotating screen or felt web, by means of or one Thorough cleaning is achieved in the ongoing operation and in which the contamination of the waste water is reduced.
  • the method according to the invention for cleaning a circulating fabric web, in particular in a paper or board machine, with a cleaning medium, in which a medium jet issuing from at least one cleaning nozzle is directed onto the fabric web, is therefore characterized in that the cleaning medium is carbon dioxide , which is brought in the liquid state and in the area of the cleaning nozzles to form dry ice particles is relaxed.
  • solid carbon dioxide snow particles dry ice particles which are formed during the expansion of liquid carbon dioxide and are discharged in a gas jet in the direction of the fabric web are used as the cleaning medium.
  • the gas jet consists either of the carbon dioxide gas formed during the expansion of the liquid carbon dioxide simultaneously with the carbon dioxide snow particles or of a separately supplied compressed gas, for example compressed air, or a mixture of both. Due to their low temperature, the dry ice particles, which strike the surface of the fabric web at a temperature of approx. 216.5 K, embrittle the dirt particles adhering to the surface and, at the same time, remove them abradingly by their high momentum.
  • the temperature effect has an effect on adhesive residues in particular, since the adhesive properties are largely eliminated at low temperatures.
  • Carbon dioxide is used in papermaking in various processes, for example in the pH adjustment and dewatering of the fiber suspension, in which DE 2006 042 429 A1 described reduction of adhesive residues (stickies) in the fiber suspension or in the synthetic production of calcium carbonate (CaCO 3 ).
  • the device according to the invention for cleaning a revolving fabric web, in particular in a paper or board machine is characterized by at least one feed for liquid carbon dioxide, which discharges at a cleaning nozzle directed at the fabric web and functioning as a decompression nozzle for the liquid carbon dioxide to form dry ice particles.
  • a further embodiment of the invention provides that the cleaning nozzle is pivotally mounted and the medium jet impinges on different parts of the fabric web as a function of the pivoting of the cleaning nozzle. It can also be arranged several cleaning nozzles transversely to the fabric web, which can also be mounted pivotably.
  • another embodiment of the invention provides for arranging the cleaning nozzle transversely to the running direction of the fabric web on a traversing device, by means of which the fabric web can be acted upon in at least a substantial part of its width by a medium jet emerging from the cleaning nozzle.
  • the cleaning nozzle is associated with a suction device, by means of which the resulting gaseous carbon dioxide can be at least largely absorbed.
  • the collected carbon dioxide can be used advantageously in various processes, in particular in different sub-processes of paper production.
  • the object of the invention is also achieved by the use of carbon dioxide snow jets for cleaning fabric webs used in papermaking during their ongoing operation.
  • the only drawing ( Fig .1 ) schematically shows the section of a drying group of a paper machine in the area of the screening stage with a device according to the invention for cleaning a fabric web.
  • a drying drum 2 running all around is arranged on a plurality of drying cylinders 3, of which only one is shown in the drawing, in contact with a paper web 4.
  • a cleaning device 8 is arranged in the area of the deflection roller 6, .
  • the cleaning device 8 comprises an enclosure 11, which is open in the region of the inlet 9 and the outlet 10 of the dryer fabric 2.
  • Within the housing 11 a plurality of cleaning nozzles 13,14 are provided, which act on the dryer fabric 2 from both sides with a cleaning medium.
  • the cleaning nozzle 14 is located on the opposite side of the paper.
  • the cleaning nozzles 13, 14 are connected to a pressure line 16 for liquid carbon dioxide; the cleaning nozzles 13, 14 themselves act as relaxation nozzles for carbon dioxide.
  • liquid carbon dioxide from a tank, not shown here is introduced via the pressure line 16 at ambient temperature and into the Purge nozzles 13, 14 passed.
  • the liquid cooling gas relaxes under strong cooling and passes into a mixture of carbon dioxide gas and carbon dioxide snow.
  • a carrier gas stream serves via a supply line 17, 18 to the respective cleaning nozzle 13, 14 zoom introduced carrier gas, for example, compressed air or nitrogen.
  • the carrier gas can also be used in the form of a jet stream to apply the mixture of gaseous carbon dioxide and carbon dioxide snow focused on the surface of the dryer fabric 2.
  • the carrier gas used may also be the carbon dioxide gas formed during the expansion of the liquid carbon dioxide.
  • the cleaning nozzles 13, 14 are arranged in a manner not shown here on a traversing device and can be moved transversely to the drying wire 2, so that with a cleaning nozzle 13, 14 substantially the entire width of the drying wire 2 is acted upon by the snow jet.
  • a plurality of cleaning nozzles spaced apart from each other transversely to the dryer fabric 2 may be used on each side, which simultaneously emit snow jets and thus likewise act on the substantially entire width of the dryer fabric 2.
  • a suction device 20 is provided, by means of which the resulting carbon dioxide can be collected and fed via a discharge line 21 to further carbon dioxide-consuming processes in papermaking. These processes are, for example, processes for processing the paper raw material, for example dewatering, the removal of adhesive residues (sticky reduction) or the pH regulation in the fiber suspension or for the production of synthetic calcium carbonate. This saves additional costs in the papermaking process.
  • the supply of the liquid carbon dioxide to the cleaning nozzles 13, 14 can be controlled by means of valves 22, 23 and regulated, for example, according to a predetermined program or in dependence on impurities detected on the drying wire 2.
  • the dryer fabric 2 is cleaned very efficiently even during ongoing operation. Downtimes due to cleaning work on the dryer 2 can thus be reduced to a minimum.
  • the device according to the invention can also be used for cleaning other circulating woven tapes, for example felt tapes in the press section of a paper machine.

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  • Paper (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)
  • Cleaning In General (AREA)
  • Cleaning By Liquid Or Steam (AREA)

Abstract

The method involves arranging a cleaning medium and a withdrawing medium jet of a fabric course on the cleaning nozzles (13,14). The cleaning medium is operated by carbon dioxide, which is introduced in the liquid condition and released in an area of the cleaning nozzles under formation of dry ice particles. Independent claims are included for the following: (1) a device for cleaning a circulating fabric course, particularly in a paper or a cardboard machine; and (2) a carbon dioxide-snow blast for cleaning the fabric courses used in the paper manufacturing.

Description

Die Erfindung betrifft ein Verfahren zur Reinigung einer umlaufenden Gewebebahn nach Patentanspruch 1 sowie eine Vorrichtung zur Reinigung einer umlaufenden Gewebebahn nach Patentanspruch 3.The invention relates to a method for cleaning a continuous fabric web according to claim 1 and to a device for cleaning a continuous fabric web according to claim 3.

In Papier- oder Kartonmaschinen werden zahlreiche umlaufende Gewebebahnen eingesetzt. So finden beispielsweise in der Siebpartie einer Papiermaschine Siebbänder Verwendung, in der Pressenpartie sind es Filze und in der Trockenpartie sogenannte Trockensiebe. Im Laufe des Betriebes setzen sich die Maschen oder Poren dieser Bahnen zu, insbesondere mit anhaftenden Papierfasern, klebrigen Stoffen oder sonstigen Füllstoffpartikeln. Um die einwandfreie Funktion des Gewebebandes sicherzustellen, ist eine sorgfältige Reinigung erforderlich. Zur Entfernung einiger Verunreinigungen können z. B. Bürsten eingesetzt werden. Andere Verfahren bzw. Vorrichtungen verwenden Strahlen bzw. Düsen und unterschiedliche Medien, wie etwa Wasser oder Druckluft. Nachteil dieser Verfahren bzw. Vorrichtungen ist es jedoch, dass damit nur ein Teil der Verunreinigungen, speziell während des Betriebes der Anlage, entfernt werden kann. Für eine vollständige Reinigung sind immer wieder längere Stillstände erforderlich, was zu Produktionseinbußen führt.In paper or board machines numerous circumferential webs are used. Thus, for example, filter belts are used in the wire section of a paper machine, felts in the press section and so-called dryer fabrics in the dryer section. In the course of operation, the mesh or pores of these webs, in particular with adhering paper fibers, sticky substances or other filler particles. To ensure proper functioning of the fabric tape, careful cleaning is required. To remove some impurities z. B. brushes are used. Other methods use jets and different media, such as water or compressed air. Disadvantage of these methods or devices, however, is that so that only a portion of the impurities, especially during operation of the system, can be removed. For a complete cleaning longer downtime is required again, which leads to production losses.

In der DE 44 19 540 A1 wird ein Verfahren und eine Vorrichtung zur Reinigung einer umlaufenden Gewebebahn im laufenden Betrieb beschrieben, bei der gleichzeitig mindestens zwei unterschiedliche Medien auf die Gewebebahn aufgetragen werden. Als Reinigungsmedium kommen dabei in unterschiedlichen Kombinationen Druckluft, Wasser, Dampf oder Reinigungschemikalien, wie Ätznatron, zum Einsatz. Nachteilig bei diesem Gegenstand ist, dass die Reinigung, insbesondere mit Wasser, Dampf oder den Reinigungschemikalien, mit einer erheblichen Kontamination des anfallenden Abwassers verbunden ist, mit der Folge einer aufwändigen Reinigung bzw. Entsorgung.In the DE 44 19 540 A1 describes a method and apparatus for cleaning a continuous fabric web during operation, in which at least two different media are simultaneously applied to the fabric web. As a cleaning medium come in different combinations compressed air, water, steam or cleaning chemicals, such as caustic soda used. A disadvantage of this article is that the cleaning, in particular with water, steam or cleaning chemicals, is associated with a significant contamination of the wastewater, with the result of a complex cleaning or disposal.

Dokument DE 101 44 574 A1 offenbart ein Verfahren zur Reinigung einer umlaufenden Gewebebahn mit einem Reinigungsmedium, bei der ein aus wenigstens einer Reinigungsdüse austretender Mediumsstrahl auf die Gewebebahn gerichtet wird. Bei dem Reinigungsmedium handelt es sich um Trockeneis aus Kohlendioxid, das in Form von Pellets aus einem Vorratsbehälter in einen Gasstrom eindosiert und durch eine Düse auf die Gewebebahn geleitet wird. Entstehendes gasförmiges Kohlendioxid wird zumindest teilweise durch eine Auffangvorrichtung aufgefangen.document DE 101 44 574 A1 discloses a method for cleaning a circulating fabric web with a cleaning medium, wherein a medium jet emerging from at least one cleaning nozzle is directed onto the fabric web. The cleaning medium is dry ice from carbon dioxide, which is metered in the form of pellets from a reservoir in a gas stream and passed through a nozzle on the fabric web. Forming gaseous carbon dioxide is at least partially collected by a collecting device.

Aufgabe der Erfindung ist es, ein Verfahren bzw. eine Vorrichtung zur Reinigung einer umlaufenden Sieb- oder Filzbahn anzugeben, mittels dem bzw. der eine gründliche Reinigung im laufenden Betreib erzielt wird und bei dem die Kontamination des Abwassers reduziert wird.The object of the invention is to provide a method and a device for cleaning a rotating screen or felt web, by means of or one Thorough cleaning is achieved in the ongoing operation and in which the contamination of the waste water is reduced.

Gelöst ist dieser Aufgabe durch ein Verfahren zur Reinigung von Gewebebahnen mit den Merkmalen des Patentanspruchs 1.This object is achieved by a method for cleaning fabric webs with the features of patent claim 1.

Das erfindungsgemäße Verfahren zur Reinigung einer umlaufenden Gewebebahn, insbesondere in einer Papier- oder Kartonmaschine, mit einem Reinigungsmedium, bei der ein aus wenigstens einer Reinigungsdüse austretender Mediumsstrahl auf die Gewebebahn gerichtet wird, ist also dadurch gekennzeichnet, dass es sich bei dem Reinigungsmedium um Kohlendioxid handelt, das im flüssigen Zustand herangeführt und im Bereich der Reinigungsdüsen unter Bildung von Trockeneisteilchen entspannt wird.The method according to the invention for cleaning a circulating fabric web, in particular in a paper or board machine, with a cleaning medium, in which a medium jet issuing from at least one cleaning nozzle is directed onto the fabric web, is therefore characterized in that the cleaning medium is carbon dioxide , which is brought in the liquid state and in the area of the cleaning nozzles to form dry ice particles is relaxed.

Erfindungsgemäß kommen als Reinigungsmedium somit feste Kohlendioxid-Schneepartikel (Trockeneisteilchen) zum Einsatz, die bei der Entspannung von flüssigem Kohlendioxid entstehen und in einem Gasstrahl in Richtung auf die Gewebebahn ausgetragen werden. Der Gasstrahl besteht entweder aus dem bei der Entspannung des flüssigen Kohlendioxids gleichzeitig mit den Kohlendioxid-Schneepartikeln entstehenden Kohlendioxidgas oder aus einem separat zugeleiteten Druckgas, beispielsweise Druckluft, oder einer Mischung aus beidem. Die auf die Oberfläche der Gewebebahn mit einer Temperatur von ca. 216,5 K auftreffenden Trockeneisteilchen verspröden durch ihre tiefe Temperatur die an der Oberfläche anhaftenden Schmutzpartikel und entfernen diese zugleich durch ihren hohen Impuls abrasiv. Der Temperatureffekt wirkt sich insbesondere bei Kleberresten aus, da die Klebeeigenschaften bei tiefen Temperaturen weitgehend beseitigt werden. Nach dem Auftreffen auf die Gewebebahn sublimieren die Trockeneisteilchen rückstandslos; die entfernten Schmutzpartikel können problemlos aufgefangen und entsorgt werden. Im Gegensatz zu Wasser als Reinigungsmedium fällt also kein zusätzliches, aufwändig zu reinigendes Abwasser an. Zugleich ist die Reinigung mit Trockeneisteilchen wesentlich effektiver als die Reinigung mit Druckluftteilchen. Obwohl die Reinigung von Oberflächen mittels Kohlendioxid-Schneestrahlen an sich bekannt ist, wurden sie trotz des seit langem bestehenden Bedürfnisses zur Reinigung von Gewebebändern bislang noch nicht zu diesem Zweck eingesetzt.According to the invention, solid carbon dioxide snow particles (dry ice particles) which are formed during the expansion of liquid carbon dioxide and are discharged in a gas jet in the direction of the fabric web are used as the cleaning medium. The gas jet consists either of the carbon dioxide gas formed during the expansion of the liquid carbon dioxide simultaneously with the carbon dioxide snow particles or of a separately supplied compressed gas, for example compressed air, or a mixture of both. Due to their low temperature, the dry ice particles, which strike the surface of the fabric web at a temperature of approx. 216.5 K, embrittle the dirt particles adhering to the surface and, at the same time, remove them abradingly by their high momentum. The temperature effect has an effect on adhesive residues in particular, since the adhesive properties are largely eliminated at low temperatures. After hitting the fabric web, the dry ice particles sublimate without residue; The removed dirt particles can be easily collected and disposed of. In contrast to water as a cleaning medium, therefore, no additional, complex to be cleaned wastewater. At the same time, cleaning with dry ice particles is much more effective than cleaning with compressed air particles. Although the cleaning of surfaces by means of carbon dioxide snow jets is known per se, despite the long-felt need for cleaning cloth belts, they have hitherto not been used for this purpose.

Beim Einsatz in der Papier- und Kartonherstellung erweist es sich als günstig, dass das bei der Entspannung des flüssigen Kohlendioxids und/oder das bei der Sublimation des festen Kohlendioxids entstehende gasförmige Kohlendioxid zumindest teilweise aufgefangen und anschließend weiteren Kohlendioxid - verarbeitenden Prozessen zugeführt wird. Kohlendioxid findet in der Papierherstellung in verschiedenen Prozessen Verwendung, beispielsweise bei der pH - Einstellung und Entwässerung der Fasersuspension, bei der in der DE 2006 042 429 A1 beschriebenen Reduzierung von Kleberresten (Stickies) in der Fasersuspension oder bei der synthetischen Herstellung von Kalziumkarbonat (CaCO3).When used in paper and board production, it proves to be favorable that the gaseous carbon dioxide formed during the expansion of the liquid carbon dioxide and / or the sublimation of the solid carbon dioxide is at least partially collected and subsequently supplied to further carbon dioxide-processing processes. Carbon dioxide is used in papermaking in various processes, for example in the pH adjustment and dewatering of the fiber suspension, in which DE 2006 042 429 A1 described reduction of adhesive residues (stickies) in the fiber suspension or in the synthetic production of calcium carbonate (CaCO 3 ).

Die Aufgabe der Erfindung wird auch mit einer Vorrichtung zum Reinigen von Gewebebahnen mit den Merkmalen des Patentanspruchs 3 gelöst.The object of the invention is also achieved with a device for cleaning fabric webs with the features of patent claim 3.

Die erfindungsgemäße Vorrichtung zur Reinigung einer umlaufenden Gewebebahn, insbesondere in einer Papier- oder Kartonmaschine, zeichnet sich durch wenigstens eine Zuführung für flüssiges Kohlendioxid aus, die an einer auf die Gewebebahn gerichteten, als Entspannungsdüse für das flüssige Kohlendioxid zur Bildung von Trockeneisteilchen fungierenden Reinigungsdüse ausmündet. Mit der erfindungsgemäßen Vorrichtung ist eine effiziente Reinigung, bei einem minimalen Anfall von zu entsorgenden Abfallstoffen, möglich.The device according to the invention for cleaning a revolving fabric web, in particular in a paper or board machine, is characterized by at least one feed for liquid carbon dioxide, which discharges at a cleaning nozzle directed at the fabric web and functioning as a decompression nozzle for the liquid carbon dioxide to form dry ice particles. With the device according to the invention an efficient cleaning, with a minimum accumulation of waste to be disposed, possible.

Eine weiterführende Ausgestaltung der Erfindung sieht vor, dass die Reinigungsdüse schwenkbar gelagert ist und der Mediumsstrahl in Abhängigkeit von der Verschwenkung der Reinigungsdüse auf unterschiedliche Teile der Gewebebahn auftrifft. Es können auch mehrere Reinigungsdüsen quer zur Gewebebahn angeordnet sein, die auch schwenkbar gelagert sein können.A further embodiment of the invention provides that the cleaning nozzle is pivotally mounted and the medium jet impinges on different parts of the fabric web as a function of the pivoting of the cleaning nozzle. It can also be arranged several cleaning nozzles transversely to the fabric web, which can also be mounted pivotably.

Alternativ oder ergänzend zur vorgenannten Anordnung sieht eine andere Ausgestaltung der Erfindung vor, die Reinigungsdüse quer zur Laufrichtung der Gewebebahn auf einer Traversiervorrichtung anzuordnen, mittels der die Gewebebahn in zumindest einem wesentlichen Teil ihrer Breite mit einem aus der Reinigungsdüse austretenden Mediumsstrahl beaufschlagt werden kann. Jedenfalls ist der Reinigungsdüse eine Absaugeinrichtung zugeordnet, mittels der das entstehende gasförmige Kohlendioxid zumindest weitgehend aufgefangen werden kann. Das aufgefangene Kohlendioxid kann in verschiedenen Prozessen, insbesondere in verschiedenen Teilprozessen der der Papierproduktion, vorteilhaft eingesetzt werden.Alternatively or in addition to the above-mentioned arrangement, another embodiment of the invention provides for arranging the cleaning nozzle transversely to the running direction of the fabric web on a traversing device, by means of which the fabric web can be acted upon in at least a substantial part of its width by a medium jet emerging from the cleaning nozzle. In any case, the cleaning nozzle is associated with a suction device, by means of which the resulting gaseous carbon dioxide can be at least largely absorbed. The collected carbon dioxide can be used advantageously in various processes, in particular in different sub-processes of paper production.

Die Aufgabe der Erfindung wird schließlich auch gelöst durch die Verwendung von Kohlendioxid - Schneestrahlen zur Reinigung von in der Papierherstellung eingesetzten Gewebebahnen während deren laufendem Betrieb.Finally, the object of the invention is also achieved by the use of carbon dioxide snow jets for cleaning fabric webs used in papermaking during their ongoing operation.

Anhand der Zeichnung soll ein Ausführungsbeispiel der Erfindung näher erläutert werden.Reference to the drawings, an embodiment of the invention will be explained in more detail.

Die einzige Zeichnung (Fig .1) zeigt schematisch den Ausschnitt einer Trockengruppe einer Papiermaschine im Bereich der Siebstufe mit einer erfindungsgemäßen Einrichtung zur Reinigung einer Gewebebahn.The only drawing ( Fig .1 ) schematically shows the section of a drying group of a paper machine in the area of the screening stage with a device according to the invention for cleaning a fabric web.

Bei der dargestellten Trockengruppe einer Papiermaschine 1 steht ein rundum laufendes Trockensieb 2 an mehreren Trockenzylindern 3, von denen in der Zeichnung nur eine dargestellt ist, in Kontakt mit einer Papierbahn 4. Über mehrere Umlenkwalzen 6, 6', 6", 6'" wird das Trockensieb 2 - in Richtung des Pfeils 7- an den Anfang der Trockengruppe zurückgeführt. Im Bereich der Umlenkwalze 6 ist eine Reinigungseinrichtung 8 angeordnet. Die Reinigungseinrichtung 8 umfasst eine Einhausung 11, die im Bereich des Eingangs 9 und des Ausgangs 10 des Trockensiebes 2 geöffnet ist. Innerhalb der Einhausung 11 sind mehrere Reinigungsdüsen 13,14 vorgesehen, die das Trockensieb 2 von beiden Seiten mit einem Reinigungsmedium beaufschlagen. Während die Reinigungsdüse 13 auf der "Papierseite" des Trockensiebs 2 angeordnet ist, also der Seite, die beim Betreib mit der Papierbahn 4 in direkten Kontakt kommt, befindet sich die Reinigungsdüse 14 auf der von der Papierseite entgegen gesetzten Seite. Die Reinigungsdüsen 13, 14 sind an einer Druckleitung 16 für flüssiges Kohlendioxid angeschlossen; die Reinigungsdüsen 13, 14 selbst fungieren zugleich als Entspannungsdüsen für Kohlendioxid. Beim Betrieb wird über die Druckleitung 16 flüssiges Kohlendioxid aus einem hier nicht gezeigten Tank mit Umgebungstemperatur herangeführt und in die Reinigungsdüsen 13, 14 geleitet. Beim Austritt aus den Reinigungsdüsen 13, 14 entspannt das flüssige Kühlendioxid unter starker Abkühlung und geht in ein Gemisch aus Kohlendioxidgas und Kohlendioxidschnee über. Um die Ausbeute an festem Kohlendioxid zu erhöhen ist es auch möglich, den Druck des flüssigen Kohlendioxids zu erhöhen und/oder die Temperatur des herangeführten flüssigen Kohlendioxids herabzusetzen, beispielsweise durch Wärmekontakt mit flüssigem Stickstoff. Der entstehende Kohlendioxidschnee wird in einem Trägergasstrom als Schneestrahl in Richtung auf das Trockensieb 2 ausgetragen. Als Trägergasstrom dient beispielsweise ein über eine Zuleitung 17, 18 zur jeweiligen Reinigungsdüse 13, 14 herangeführtes Trägergas, beispielsweise Druckluft oder Stickstoff. Das Trägergas kann auch in Form eines Mantelstrahls eingesetzt werden, um das Gemisch aus gasförmigem Kohlendioxid und Kohlendioxidschnee fokussiert auf die Oberfläche des Trockensiebs 2 aufzutragen. Als Trägergas kann auch das bei der Entspannung des flüssigen Kohlendioxids entstehende Kohlendioxidgas zum Einsatz kommen.In the illustrated drying group of a paper machine 1, a drying drum 2 running all around is arranged on a plurality of drying cylinders 3, of which only one is shown in the drawing, in contact with a paper web 4. Via a plurality of guide rollers 6, 6 ', 6 ", 6'" the drying wire 2 - returned in the direction of arrow 7 to the beginning of the drying group. In the area of the deflection roller 6, a cleaning device 8 is arranged. The cleaning device 8 comprises an enclosure 11, which is open in the region of the inlet 9 and the outlet 10 of the dryer fabric 2. Within the housing 11 a plurality of cleaning nozzles 13,14 are provided, which act on the dryer fabric 2 from both sides with a cleaning medium. While the cleaning nozzle 13 is arranged on the "paper side" of the dryer 2, ie the side which comes into direct contact with the paper web 4 during operation, the cleaning nozzle 14 is located on the opposite side of the paper. The cleaning nozzles 13, 14 are connected to a pressure line 16 for liquid carbon dioxide; the cleaning nozzles 13, 14 themselves act as relaxation nozzles for carbon dioxide. During operation, liquid carbon dioxide from a tank, not shown here, is introduced via the pressure line 16 at ambient temperature and into the Purge nozzles 13, 14 passed. Upon exiting the cleaning nozzles 13, 14, the liquid cooling gas relaxes under strong cooling and passes into a mixture of carbon dioxide gas and carbon dioxide snow. In order to increase the yield of solid carbon dioxide, it is also possible to increase the pressure of the liquid carbon dioxide and / or to lower the temperature of the supplied liquid carbon dioxide, for example by thermal contact with liquid nitrogen. The resulting carbon dioxide snow is discharged in a carrier gas stream as a snow jet in the direction of the drying wire 2. As a carrier gas stream, for example, serves via a supply line 17, 18 to the respective cleaning nozzle 13, 14 zoom introduced carrier gas, for example, compressed air or nitrogen. The carrier gas can also be used in the form of a jet stream to apply the mixture of gaseous carbon dioxide and carbon dioxide snow focused on the surface of the dryer fabric 2. The carrier gas used may also be the carbon dioxide gas formed during the expansion of the liquid carbon dioxide.

Die Reinigungsdüsen 13, 14 sind in hier nicht gezeigter Weise auf einer Traversiervorrichtung angeordnet und können quer zum Trockensieb 2 verfahren werden, sodass mit einer Reinigungsdüse 13, 14 im wesentlichen die gesamte Breite des Trockensiebs 2 mit dem Schneestrahl beaufschlagt wird. Alternativ dazu können auf jeder Seite auch mehrere, jeweils quer zum Trockensieb 2 beabstandet voneinander angeordnete Reinigungsdüsen zum Einsatz kommen, die gleichzeitig Schneestrahlen abstrahlen und so ebenfalls die im Wesentlichen gesamte Breite des Trockensiebs 2 beaufschlagen. Innerhalb der Einhausung 11 ist eine Absaugeinrichtung 20 vorgesehen, mittels der das entstehende Kohlendioxid aufgefangen und über eine Ableitung 21 weiteren Kohlendioxid - verbrauchenden Prozessen in der Papierherstellung zugeführt werden kann. Bei diesen Prozessen handelt es sich beispielsweise um Prozesse zur Aufarbeitung des Papierrohstoffes, beispielsweise der Entwässerung, der Beseitigung von Kleberresten (Stickyreduzierung) oder der pH-Regulierung in der Fasersuspension oder zur Herstellung von synthetischem Kalziumkarbonat. Auf diese Weise werden weitere Kosten im Papierherstellungsprozess eingespart.The cleaning nozzles 13, 14 are arranged in a manner not shown here on a traversing device and can be moved transversely to the drying wire 2, so that with a cleaning nozzle 13, 14 substantially the entire width of the drying wire 2 is acted upon by the snow jet. Alternatively, a plurality of cleaning nozzles spaced apart from each other transversely to the dryer fabric 2 may be used on each side, which simultaneously emit snow jets and thus likewise act on the substantially entire width of the dryer fabric 2. Within the housing 11, a suction device 20 is provided, by means of which the resulting carbon dioxide can be collected and fed via a discharge line 21 to further carbon dioxide-consuming processes in papermaking. These processes are, for example, processes for processing the paper raw material, for example dewatering, the removal of adhesive residues (sticky reduction) or the pH regulation in the fiber suspension or for the production of synthetic calcium carbonate. This saves additional costs in the papermaking process.

Im Übrigen kann die Zuführung des flüssigen Kohlendioxids an die Reinigungsdüsen 13, 14 mithilfe von Ventilen 22, 23 gesteuert und beispielsweise nach einem vorgegebenen Programm oder in Abhängigkeit von auf dem Trockensieb 2 detektierten Verunreinigungen geregelt werden.Incidentally, the supply of the liquid carbon dioxide to the cleaning nozzles 13, 14 can be controlled by means of valves 22, 23 and regulated, for example, according to a predetermined program or in dependence on impurities detected on the drying wire 2.

Durch den Einsatz der erfindungsgemäßen Vorrichtung wird das Trockensieb 2 sehr effizient auch bei laufendem Betreib gereinigt. Stillstände aufgrund von Reinigungsarbeiten am Trockensieb 2 können somit auf ein Minimum reduziert werden. Die erfindungsgemäße Vorrichtung kann auch zur Reinigung anderer umlaufender Gewebebänder eingesetzt werden, beispielsweise Filzbänder in der Pressenpartie einer Papiermaschine.Through the use of the device according to the invention, the dryer fabric 2 is cleaned very efficiently even during ongoing operation. Downtimes due to cleaning work on the dryer 2 can thus be reduced to a minimum. The device according to the invention can also be used for cleaning other circulating woven tapes, for example felt tapes in the press section of a paper machine.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Papiermaschinepaper machine
22
Trockensiebdryer
33
Trockenzylinderdrying cylinders
44
Papierbahnpaper web
55
--
6,6',6",6"'6,6 ', 6 ", 6"'
Umlenkwalzedeflecting
77
Pfeilarrow
88th
Reinigungseinrichtungcleaning device
99
Eingangentrance
1010
Ausgangoutput
1111
Einhausunghousing
1212
--
1313
Reinigungsdüsecleaning nozzle
1414
Reinigungsdüsecleaning nozzle
1515
--
1616
Druckleitungpressure line
1717
Zuleitung (für Trägergas)Supply line (for carrier gas)
1818
Zuleitung (für Trägergas)Supply line (for carrier gas)
1919
--
2020
Absaugvorrichtungsuction
2121
Ableitungderivation
2222
VentilValve
2323
VentilValve

Claims (6)

  1. Method for cleaning a circulating woven-fabric web (2) of a paper or cardboard machine having a cleaning medium, in which a medium jet which emerges from at least one cleaning nozzle (13, 14) is directed onto the woven-fabric web (2), the cleaning medium being carbon dioxide which is guided in in the liquid state and is expanded in the region of the cleaning nozzles (13, 14) with the formation of dry ice particles, and the gaseous carbon dioxide which is produced during the expansion of the liquid carbon dioxide and/or during the sublimation of the solid carbon dioxide being collected at least partially in a collecting device (20) and being fed to processes in the paper production which process carbon dioxide.
  2. Method according to Claim 1, characterized in that the medium jet is applied to the woven-fabric web (2) on one or both sides during the circulation of the woven-fabric web (2).
  3. Device for cleaning a circulating woven-fabric web of a paper or cardboard machine having at least one feed (16) for liquid carbon dioxide, which feed (16) opens at a cleaning nozzle (13, 14) which is directed onto the woven-fabric web (2) and acts as an expansion nozzle for the liquid carbon dioxide in order to form dry ice particles, and the cleaning nozzle (13, 14) having assigned to it an extraction device (20), by means of which the gaseous carbon dioxide which is produced can be collected at least largely for the purpose of further use.
  4. Device according to Claim 3, characterized in that the cleaning nozzle (13, 14) is mounted pivotably and the medium jet strikes different parts of the woven-fabric web (2) as a function of the pivoting of the cleaning nozzle.
  5. Device according to Claim 3 or 4, characterized in that the cleaning nozzle (13, 14) is arranged transversely with respect to the running direction of the woven-fabric web (2) on a traversing device, by means of which the woven-fabric web (2) can be loaded in at least one substantial part of its width with a medium jet which emerges from the cleaning nozzle (13, 14).
  6. Device according to one of Claims 3 to 5, characterized in that a wire or felt web which is used in paper production is provided as woven-fabric web (2).
EP09170028A 2008-09-29 2009-09-11 Method and device for cleaning a moving fabric Not-in-force EP2169111B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL09170028T PL2169111T3 (en) 2008-09-29 2009-09-11 Method and device for cleaning a moving fabric
SI200930165T SI2169111T1 (en) 2008-09-29 2009-09-11 Method and device for cleaning a moving fabric

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008049337A DE102008049337A1 (en) 2008-09-29 2008-09-29 Method and device for cleaning a continuous fabric web

Publications (2)

Publication Number Publication Date
EP2169111A1 EP2169111A1 (en) 2010-03-31
EP2169111B1 true EP2169111B1 (en) 2011-11-09

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Application Number Title Priority Date Filing Date
EP09170028A Not-in-force EP2169111B1 (en) 2008-09-29 2009-09-11 Method and device for cleaning a moving fabric

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Country Link
EP (1) EP2169111B1 (en)
AT (1) ATE532899T1 (en)
DE (1) DE102008049337A1 (en)
ES (1) ES2377441T3 (en)
PL (1) PL2169111T3 (en)
SI (1) SI2169111T1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022017983A1 (en) * 2020-07-20 2022-01-27 Euwe Eugen Wexler Holding Gmbh & Co. Kg Method for producing a plastic component

Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
DE102010028309B4 (en) * 2010-04-28 2011-12-08 Swen Müller Sieve belt for a paper or board machine
DE102015015949A1 (en) * 2015-12-08 2017-06-08 Messer Austria Gmbh Method and device for treating a press felt
CN109576920B (en) * 2018-11-06 2021-01-19 浙江国富纺织科技有限公司 High-efficient belt cleaning drying device of cloth for weaving

Family Cites Families (6)

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Publication number Priority date Publication date Assignee Title
AT400157B (en) 1993-06-21 1995-10-25 Andritz Patentverwaltung METHOD AND DEVICE FOR CLEANING A CONTINUOUS FABRIC PATTERN
US5853493A (en) * 1997-08-22 1998-12-29 Albany International Corp. Cleaning of industrial fabrics using cryoblasting techniques
DE10144574A1 (en) * 2001-09-11 2003-03-27 Voith Paper Patent Gmbh Cleaning station for a web carrier belt, at a papermaking/cardboard production machine, has a jet to spray the belt surface with dry ice pellets in a gas stream
DE102005035433A1 (en) * 2005-07-28 2007-02-01 Linde Ag Device and method for cleaning rails
DE102005055988A1 (en) * 2005-11-24 2007-05-31 Voith Patent Gmbh Apparatus for cleaning moving belt, especially in papermaking machine, has cleaning device providing cleaning intensity automatically adjusted using belt properties evaluated by detector
DE102006042429B3 (en) 2006-09-09 2008-01-24 Messer Austria Gmbh Removal of adhesive residues during the recycling of waste paper, comprises disintegrating the waste paper to an aqueous suspension and subjecting the suspension to a physicochemical treatment for separating coarse-grained residues

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022017983A1 (en) * 2020-07-20 2022-01-27 Euwe Eugen Wexler Holding Gmbh & Co. Kg Method for producing a plastic component

Also Published As

Publication number Publication date
PL2169111T3 (en) 2012-06-29
ATE532899T1 (en) 2011-11-15
DE102008049337A1 (en) 2010-04-08
EP2169111A1 (en) 2010-03-31
ES2377441T3 (en) 2012-03-27
SI2169111T1 (en) 2012-06-29

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