EP1806453A1 - Method and device for dewatering a sheet of fibrous material - Google Patents

Method and device for dewatering a sheet of fibrous material Download PDF

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Publication number
EP1806453A1
EP1806453A1 EP06026164A EP06026164A EP1806453A1 EP 1806453 A1 EP1806453 A1 EP 1806453A1 EP 06026164 A EP06026164 A EP 06026164A EP 06026164 A EP06026164 A EP 06026164A EP 1806453 A1 EP1806453 A1 EP 1806453A1
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Prior art keywords
web
vacuum
paper web
dewatering
running direction
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EP06026164A
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German (de)
French (fr)
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EP1806453B1 (en
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Jörg Dipl. Ing. Dr. Bauböck
Paul Arnold
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Andritz AG
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Andritz AG
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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
    • D21F1/48—Suction apparatus
    • 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
    • D21F1/48—Suction apparatus
    • D21F1/52—Suction boxes without rolls
    • D21F1/523—Covers thereof

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  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

The method involves placing an air-permeable wire (1) or felt under the paper web (3), for extracting water, after applying 3-100 vacuum pulses with respect to the particles of paper web. The maximum and minimum values of vacuum pulses are set to be 150-900 mbar and 0 mbar, respectively. An independent claim is included for device for dewatering paper web.

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Entwässerung einer Faserstoffbahn, insbesondere Papierbahn, mittels Vakuum.The invention relates to a method and a device for dewatering a fibrous web, in particular paper web, by means of vacuum.

Bei bekannten Verfahren erfolgt die Entwässerung z.B. einer Papierbahn, die sich auf einem luftdurchlässigen Sieb oder Filz befindet, nach der Formierzone durch Vakuum, das über Kästen, die sich unter der Bahn und dem Sieb befinden, Wasser aus der Bahn und dem Sieb oder Filz absaugt. Insbesondere erfolgt eine Vakuumentwässerung in Tissuemaschinen, die nach dem Durchströmtrocknungsprinzip arbeiten. Die Absaugung erfolgt dabei üblicherweise durch Schlitze in einer Platte, über die die Papierbahn gleitet. Ziel der Entwässerung ist es, nach dem Aufbringen des Vakuums einen möglichst hohen Trockengehalt der Papierbahn zu erzielen. Dem erreichbaren Trockengehalt sind jedoch durch die Vakuumhöhe und die Schlitzbreite Grenzen gesetzt.In known processes, dewatering takes place e.g. a paper web which is on an air-permeable screen or felt, after the forming zone by vacuum, which sucks water from the web and the screen or felt via boxes located under the web and the screen. In particular, vacuum dewatering takes place in tissue machines which operate on the through-flow drying principle. The suction is usually carried out by slots in a plate over which slides the paper web. The aim of dewatering is to achieve the highest possible dry content of the paper web after applying the vacuum. The achievable dry content, however, are limited by the vacuum level and the slot width.

Ziel der Erfindung ist es daher, eine Erhöhung des Trockengehaltes nach der Vakuumentwässerung um einige Prozentpunkte im Vergleich zur herkömmlichen Entwässerung oder bei gleichem Trockengehalt eine Energieeinsparung an den Vakuumpumpen zu erreichen.The aim of the invention is therefore to achieve an increase in dry content after vacuum dewatering by a few percentage points compared to conventional dewatering or at the same dry content, energy savings on the vacuum pump.

Die Erfindung ist daher dadurch gekennzeichnet, dass das Vakuum zwischen einem Maximalwert und einem Minimalwert pulsierend aufgebracht wird, wobei der Maximalwert des Vakuums zwischen 150 und 900 mbar, vorzugsweise zwischen 300 und 700 mbar, betragen kann. Durch die pulsierende Aufbringung des Vakuums kann die Entwässerung gegenüber der herkömmlichen konstanten Aufbringung stark verbessert werden.The invention is therefore characterized in that the vacuum between a maximum value and a minimum value is applied pulsating, wherein the maximum value of the vacuum between 150 and 900 mbar, preferably between 300 and 700 mbar, may be. The pulsating application of the vacuum can greatly improve dewatering over conventional constant application.

Eine vorteilhafte Weiterbildung der Erfindung ist dadurch gekennzeichnet, dass 3 bis 100 Pulse auf ein Teilchen der sich bewegenden Papierbahn, vorzugsweise zwischen 25 und 100 Pulse aufgebracht werden. Durch eine höhere Zahl von Pulsen wird die Entwässerungsleistung erhöht.An advantageous development of the invention is characterized in that 3 to 100 pulses are applied to a particle of the moving paper web, preferably between 25 and 100 pulses. Increasing the number of pulses increases drainage performance.

Eine günstige Ausgestaltung der Erfindung ist dadurch gekennzeichnet, dass der Minimalwert des Vakuums 0 mbar beträgt.A favorable embodiment of the invention is characterized in that the minimum value of the vacuum is 0 mbar.

Zur weiteren Steigerung der Entwässerungsleistung ist es vorteilhaft, wenn zwei oder mehrere Vakuumquellen nacheinander die Faserstoffbahn, insbesondere Papierbahn, entwässern.To further increase the dewatering performance, it is advantageous if two or more vacuum sources successively dewater the fibrous web, in particular the paper web.

Besonders günstig für die Entwässerungsleistung hat sich erwiesen, dass die Frequenz der Pulsationen zwischen 1500 und 10000 Hertz liegt.Particularly favorable for the drainage performance has been found that the frequency of the pulsations between 1500 and 10,000 hertz.

Die Erfindung betrifft auch eine Vorrichtung zur Entwässerung einer Faserstoffbahn, insbesondere Papierbahn, mittels Vakuum. Diese ist erfindungsgemäß dadurch gekennzeichnet, dass mindestens ein Saugkasten vorgesehen ist, der Mittel zur pulsierenden Aufbringung eines Vakuums auf die Faserstoffbahn, insbesondere Papierbahn, zwischen einem Maximalwert und einem Minimalwert, aufweist, wobei der mindestens eine Saugkasten vorteilhafter Weise an der der Faserstoffbahn, insbesondere Papierbahn, zugewandten Seite eine Lochplatte aufweist. Mit einem derartigen an eine Vakuumanlage angeschlossenen Saugkasten lassen sich wesentlich höhere Trockengehalte erzielen, als bei konventionellen Anlagen.The invention also relates to a device for dewatering a fibrous web, in particular paper web, by means of vacuum. This is inventively characterized in that at least one suction box is provided, the means for pulsating application of a vacuum on the fibrous web, in particular paper web, between a maximum value and a minimum value, wherein the at least one suction box advantageously on the fibrous web, in particular paper web , facing side has a perforated plate. With such a suction box connected to a vacuum system, substantially higher dry contents can be achieved than with conventional systems.

Eine günstige Ausgestaltung der Erfindung ist dadurch gekennzeichnet, dass die Löcher der Lochplatte kreisrund, länglich oder elliptisch sind. Damit können hohe freie Flächen erzielt werden.A favorable embodiment of the invention is characterized in that the holes of the perforated plate are circular, oblong or elliptical. This allows high free areas to be achieved.

Eine vorteilhafte Weiterbildung der Erfindung ist dadurch gekennzeichnet, dass die Löcher des Lochblechs in Bahnlaufrichtung gesehen einen (Mittelpunkts-) Abstand von 4 bis 25 mm aufweisen, wobei sich die Löcher der in Bahnlaufrichtung aufeinander folgenden Lochreihen quer zur Bahnlaufrichtung überdecken können. Mit dieser Aufteilung lässt sich eine optimale Impulsanzahl realisieren.An advantageous development of the invention is characterized in that the holes of the perforated plate seen in the web running direction have a (midpoint) distance of 4 to 25 mm, wherein the holes of the consecutive in the web running direction rows of holes can overlap transversely to the web running direction. With this division, an optimal number of pulses can be realized.

Wenn der mindestens eine Saugkasten in Bahnlaufrichtung gesehen eine Länge von 100 bis 500 mm, vorzugsweise 200 bis 400 mm aufweist, können eine ausreichende Anzahl von Pulsen und damit eine hohe Entwässerungsleistung realisiert werden.If the at least one suction box seen in the web running direction has a length of 100 to 500 mm, preferably 200 to 400 mm, a sufficient number of pulses and thus a high dewatering performance can be realized.

Besonders vorteilhaft ist es, wenn mehrere, insbesondere zwei, Saugkästen in Bahnlaufrichtung hintereinander an der Faserstoffbahn, insbesondere Papierbahn, angeordnet sind.It is particularly advantageous if several, in particular two, suction boxes are arranged one behind the other in the web running direction on the fibrous web, in particular the paper web.

Die Erfindung wir nun anhand der Zeichnungen beispielhaft beschrieben, wobei Fig. 1 eine erfindungsgemäße Anordnung an einem Formiersieb einer Durchströmtrockenmaschine, Fig. 2 einen Vakuumkasten gemäß der Erfindung, Fig. 3 den Vakuumverlauf für ein Teilchen der Papierbahn und Fig. 4 eine Draufsicht auf eine Lochplatte der Erfindung darstellt.The invention will now be described by way of example with reference to the drawings, in which: FIG. 1 shows an arrangement according to the invention on a forming screen of a throughflow drying machine, FIG. 2 shows a vacuum box according to the invention, FIG. 3 shows the vacuum curve for a particle of the paper web, and FIG Perforated plate of the invention represents.

In Fig. 1 ist der Nassteil einer Papiermaschine, insbesondere einer Durchströmtrocknungsanlage einer Tissuemaschine dargestellt. Dieser Teil dient zur Blattbildung und besteht aus einem Formiersieb 1 und einem Außensieb 2. Die Stoffsuspension wird durch einen Stoffauflauf 5 zwischen Formiersieb 1 und Außensieb 2 eingedüst und um eine Formierwalze 6, die auch Absaugelemente beinhalten kann geführt, wodurch sich eine Papierbahn 3 bildet. Diese Papierbahn 3 wird zumindest über einen, vorzugsweise aber mehrere Vakuumkästen 7 geführt, wobei diese auch gegenüber von Umlenkwalzen 8 angeordnet sein können. Die Papierbahn 3 wird dann in weiterer Folge mittels eines Bahnabnahmekastens 9 oder einer Bahnabnahmewalze auf ein Trockensieb 4 übernommen, auf dem sie dann dem Trockner, insbesondere Durchströmtrockner, zugeführt wird.FIG. 1 shows the wet part of a paper machine, in particular a through-flow drying system of a tissue machine. This part is used for sheet formation and consists of a forming fabric 1 and an outer sieve 2. The stock suspension is injected through a headbox 5 between the forming fabric 1 and outer sieve 2 and guided around a forming roller 6, which may also include suction, whereby a paper web 3 is formed. This paper web 3 is guided over at least one, but preferably a plurality of vacuum boxes 7, wherein these can also be arranged opposite deflection rollers 8. The paper web 3 is then taken over by a web take-off box 9 or a web take-off roll on a drying wire 4, on which it is then fed to the dryer, in particular through-flow dryer.

Fig. 2 zeigt ein Teilchen 10 der Papierbahn 3, das zusammen mit dem Formiersieb 1 über eine Lochplatte 11 bewegt wird. Dadurch wirkt das am Vakuumkasten 7 angelegte Vakuum pulsierend auf das Teilchen 10. Durch die Teilung A [m] der Löcher 12 und die Maschinengeschwindigkeit S [m/s] ergibt sich die Frequenz f [Hz] der Pulse nach der Formel f = S / A .

Figure imgb0001
Fig. 2 shows a particle 10 of the paper web 3, which is moved together with the forming fabric 1 via a perforated plate 11. As a result, the vacuum applied to the vacuum box 7 has a pulsating effect on the particle 10. The pitch A [m] of the holes 12 and the machine speed S [m / s] results in the frequency f [Hz] of the pulses according to the formula f = S / A ,
Figure imgb0001

Die Löcher 12 der Lochplatte 11 können dabei kreisrund, länglich oder elliptisch ausgebildet sein.The holes 12 of the perforated plate 11 may be circular, oblong or elliptical.

Mit einer erfindungsgemäßen Anordnung ist bei gleicher offener Fläche der Löcher wie der herkömmlichen Schlitze eines Absaugkastens und gleichem Absaugvolumen eine Steigerung des Trockengehaltes einer Papierbahn von ca. 25 % auf ca. 28 % erzielt worden.With an arrangement according to the invention, an increase in the dry content of a paper web from approximately 25% to approximately 28% has been achieved with the same open area of the holes as the conventional slots of a suction box and the same extraction volume.

Fig. 3 zeigt den Verlauf des Vakuums, der auf ein Teilchen der Papierbahn wirkt, über die Zeit. Der Wert V kann dabei zwischen 150 und 900 mbar, insbesondere zwischen 300 und 700 mbar betragen.Fig. 3 shows the course of the vacuum, which acts on a particle of the paper web, over time. The value V can be between 150 and 900 mbar, in particular between 300 and 700 mbar.

Fig. 4 zeigt eine Draufsicht auf eine Lochplatte 11 gemäß der Erfindung, wobei die Löcher 12 in Bahnlaufrichtung MD eine Teilung A aufweisen. Man sieht hier auch, dass sich die Löcher 12 der aufeinander folgenden Reihen quer zur Bahnlaufrichtung MD überdecken und somit kein Streifen bleibt, der nicht dem Vakuum unterworfen ist.4 shows a plan view of a perforated plate 11 according to the invention, the holes 12 having a pitch A in the web running direction MD. It can also be seen here that the holes 12 of the successive rows overlap transversely to the web running direction MD and thus no strip remains which is not subjected to the vacuum.

Claims (14)

Verfahren zur Entwässerung einer Faserstoffbahn, insbesondere Papierbahn, mittels Vakuum, dadurch gekennzeichnet, dass das Vakuum zwischen einem Maximalwert und einem Minimalwert pulsierend aufgebracht wird.Method for dewatering a fibrous web, in particular a paper web, by means of a vacuum, characterized in that the vacuum is applied pulsating between a maximum value and a minimum value. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass 3 bis 100 Pulse auf ein Teilchen (10) der bewegten Bahn (3), vorzugsweise zwischen 25 und 100 Pulse aufgebracht werden.A method according to claim 1, characterized in that 3 to 100 pulses are applied to a particle (10) of the moving web (3), preferably between 25 and 100 pulses. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Maximalwert (V) des Vakuums zwischen 150 und 900 mbar beträgt.A method according to claim 1 or 2, characterized in that the maximum value (V) of the vacuum is between 150 and 900 mbar. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass der Maximalwert (V) des Vakuums zwischen 500 und 700 mbar beträgt.A method according to claim 3, characterized in that the maximum value (V) of the vacuum is between 500 and 700 mbar. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Minimalwert des Vakuums 0 mbar beträgt.Method according to one of claims 1 to 4, characterized in that the minimum value of the vacuum is 0 mbar. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass zwei Vakuumquellen nacheinander die Faserstoffbahn (3), insbesondere Papierbahn, entwässern.Method according to one of claims 1 to 5, characterized in that two vacuum sources sequentially dewater the fibrous web (3), in particular paper web. Verfahren nach einem der Ansprüche 2 bis 6, dadurch gekennzeichnet, dass die Frequenz der Pulsationen zwischen 1500 und 10000 Hertz liegt.Method according to one of claims 2 to 6, characterized in that the frequency of the pulsations is between 1500 and 10000 hertz. Vorrichtung zur Entwässerung einer Faserstoffbahn, insbesondere Papierbahn, mittels Vakuum, dadurch gekennzeichnet, dass mindestens ein Saugkasten (7) vorgesehen ist, der Mittel zur pulsierenden Aufbringung eines Vakuums auf die Faserstoffbahn, insbesondere Papierbahn, zwischen einem Maximalwert (V) und einem Minimalwert, aufweist.Device for dewatering a fibrous web, in particular a paper web, by means of a vacuum, characterized in that at least one suction box (7) is provided which has means for pulsating application of a vacuum to the fibrous web, in particular paper web, between a maximum value (V) and a minimum value , Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass der mindestens eine Saugkasten (7) an der der Faserstoffbahn (3), insbesondere Papierbahn, zugewandten Seite eine Lochplatte (11) aufweist.Apparatus according to claim 8, characterized in that the at least one suction box (7) on the fibrous web (3), in particular paper web, side facing a perforated plate (11). Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, dass die Löcher (12) der Lochplatte (11) kreisrund, länglich oder elliptisch sind.Apparatus according to claim 9, characterized in that the holes (12) of the perforated plate (11) are circular, oblong or elliptical. Vorrichtung nach Anspruch 9 oder 10, dadurch gekennzeichnet, dass die Löcher (12) der Lochplatte (11) in Bahnlaufrichtung gesehen einen (Mittelpunkts-) Abstand (A) von 4 bis 25 mm aufweisen.Apparatus according to claim 9 or 10, characterized in that the holes (12) of the perforated plate (11) seen in the web running direction have a (center) distance (A) of 4 to 25 mm. Vorrichtung nach einem der Ansprüche 9 bis 11, dadurch gekennzeichnet, dass sich die Löcher (12) der in Bahnlaufrichtung aufeinander folgenden Lochreihen quer zur Bahnlaufrichtung überdecken.Device according to one of claims 9 to 11, characterized in that overlap the holes (12) in the web running direction consecutive rows of holes transversely to the web running direction. Vorrichtung nach einem der Ansprüche 8 bis 12, dadurch gekennzeichnet, dass der mindestens eine Saugkasten (7) in Bahnlaufrichtung gesehen eine Länge von 100 bis 500 mm, vorzugsweise 200 bis 400 mm aufweist.Device according to one of claims 8 to 12, characterized in that the at least one suction box (7) seen in the web running direction has a length of 100 to 500 mm, preferably 200 to 400 mm. Vorrichtung nach einem der Ansprüche 8 bis 13, dadurch gekennzeichnet, dass mehrere, insbesondere zwei, Saugkästen (7) in Bahnlaufrichtung hintereinander an der Faserstoffbahn (3), insbesondere Papierbahn, angeordnet sind.Device according to one of claims 8 to 13, characterized in that several, in particular two, suction boxes (7) in the web running direction one behind the other on the fibrous web (3), in particular paper web, are arranged.
EP06026164A 2006-01-05 2006-12-18 Method and device for dewatering a sheet of fibrous material Revoked EP1806453B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT0001406A AT502805B1 (en) 2006-01-05 2006-01-05 METHOD AND DEVICE FOR DRAINING A FIBROUS WEB

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EP1806453A1 true EP1806453A1 (en) 2007-07-11
EP1806453B1 EP1806453B1 (en) 2010-10-20

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EP06026164A Revoked EP1806453B1 (en) 2006-01-05 2006-12-18 Method and device for dewatering a sheet of fibrous material

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US (1) US7686922B2 (en)
EP (1) EP1806453B1 (en)
AT (2) AT502805B1 (en)
BR (1) BRPI0700085A (en)
CA (1) CA2572525C (en)
DE (1) DE502006008125D1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI20085408L (en) * 2008-05-05 2009-11-06 Metso Paper Inc The wire part of a paper or cardboard machine, the method of forming the web and the suction box
FI127338B (en) * 2010-04-26 2018-04-13 Valmet Technologies Inc Vacuum equipment for fiber web machine and fiber machine with vacuum equipment

Citations (7)

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US2991218A (en) * 1958-01-31 1961-07-04 Rice Barton Corp Paper making
DE1761174A1 (en) * 1967-04-17 1971-06-16 Leder & Riemen Patent Component for paper machines or pulp dewatering machines
US4140573A (en) * 1975-11-06 1979-02-20 Jwi Ltd. Stock formation in a paper making process
GB2143871A (en) * 1983-07-23 1985-02-20 Beloit Walmsley Ltd Twin wire paper forming machine
EP0251778A1 (en) * 1986-07-02 1988-01-07 Valmet-Karhula Inc. Method and apparatus for removing water from a fibrous web in a papermachine
US5466341A (en) * 1993-07-07 1995-11-14 Valmet Paper Machinery, Inc. Method for draining water from a paper web
WO1997045589A1 (en) * 1996-05-31 1997-12-04 Valmet-Karlstad Ab A method and board machine for manufacturing a paperboard web

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ZA8862B (en) * 1987-01-08 1988-12-28 Usg Interiors Inc Method for manufacture of lightweight frothed mineral wool panel
DE4310540C2 (en) * 1993-03-31 1997-06-12 Voith Sulzer Papiermasch Gmbh Last molders
US5935382A (en) * 1996-05-31 1999-08-10 Valmet-Karlstad Ab Method and board machine for manufacturing a paperboard web
EP1543194B1 (en) * 2002-08-23 2017-12-27 Valmet Technologies, Inc. Forming of a paper or board web in a twin-wire former
FI116688B (en) * 2004-02-13 2006-01-31 Metso Paper Inc Multi-layer forming portion

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2991218A (en) * 1958-01-31 1961-07-04 Rice Barton Corp Paper making
DE1761174A1 (en) * 1967-04-17 1971-06-16 Leder & Riemen Patent Component for paper machines or pulp dewatering machines
US4140573A (en) * 1975-11-06 1979-02-20 Jwi Ltd. Stock formation in a paper making process
GB2143871A (en) * 1983-07-23 1985-02-20 Beloit Walmsley Ltd Twin wire paper forming machine
EP0251778A1 (en) * 1986-07-02 1988-01-07 Valmet-Karhula Inc. Method and apparatus for removing water from a fibrous web in a papermachine
US5466341A (en) * 1993-07-07 1995-11-14 Valmet Paper Machinery, Inc. Method for draining water from a paper web
WO1997045589A1 (en) * 1996-05-31 1997-12-04 Valmet-Karlstad Ab A method and board machine for manufacturing a paperboard web

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EP1806453B1 (en) 2010-10-20
AT502805B1 (en) 2007-06-15
AT502805A4 (en) 2007-06-15
US7686922B2 (en) 2010-03-30
CA2572525C (en) 2013-09-03
US20070181276A1 (en) 2007-08-09
BRPI0700085A (en) 2007-10-16
ATE485420T1 (en) 2010-11-15
DE502006008125D1 (en) 2010-12-02
CA2572525A1 (en) 2007-07-05

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