EP1619300B1 - Pressing arrangement - Google Patents

Pressing arrangement Download PDF

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Publication number
EP1619300B1
EP1619300B1 EP05108375A EP05108375A EP1619300B1 EP 1619300 B1 EP1619300 B1 EP 1619300B1 EP 05108375 A EP05108375 A EP 05108375A EP 05108375 A EP05108375 A EP 05108375A EP 1619300 B1 EP1619300 B1 EP 1619300B1
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EP
European Patent Office
Prior art keywords
arrangement according
water
suction channel
press arrangement
channel wall
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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.)
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EP05108375A
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German (de)
French (fr)
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EP1619300A1 (en
Inventor
Karl Steiner
Robert Wolf
Hans Prinzing
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Voith Patent GmbH
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Voith Patent GmbH
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Priority claimed from DE10014873A external-priority patent/DE10014873A1/en
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Priority claimed from EP00128157A external-priority patent/EP1116822B1/en
Publication of EP1619300A1 publication Critical patent/EP1619300A1/en
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Publication of EP1619300B1 publication Critical patent/EP1619300B1/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • 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
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0272—Wet presses in combination with suction or blowing devices

Definitions

  • the invention relates to a press arrangement according to the preamble of claim 1.
  • the press water is usually removed by gravity.
  • the amount of water thrown off into the tub can not in each case flow laterally by gravity to the edge of the tub.
  • water can flow back to the felt.
  • a suction box for sucking water passing through a sieve has already become known, which is subdivided into a water suction chamber and an air suction chamber by a dividing wall provided with passages.
  • An object of the invention is to provide an improved water drainage device, in which a reduction of the outflow cross section of the trough accompanied by a corresponding space saving is possible without problems.
  • the thrown off by the most grooved and / or blind drilled press rolls water after the press nip and must be removed. Otherwise, most of the thrown-off water is absorbed by the endless circulating Enticass mecanicsbändem, resulting in particular in the upper dewatering belt for rewetting of the fibrous web. This is usually done by gullies, which collect and remove the thrown off water.
  • the gutter can not be positioned close enough to the press nip.
  • the spun-off water of the upper press roll can be collected. The rest predominantly enters the upper dewatering belt, which then leads to the mentioned, considerable rewetting of the fibrous web.
  • the aim of the invention is therefore to improve the efficiency of the water intake device of press arrangements.
  • this object is solved by the features of claim 1.
  • the suction channel For detecting the main direction of the centrifuged water, it is sufficient if the suction channel, at least in the initial region has a gap width of 1 to 50 mm, preferably from 2 to 7 mm. Especially with a rising suction channel, a certain minimum negative pressure in the suction channel is required to overcome the height difference caused by the absorbed water.
  • the negative pressure in the suction channel should therefore be between 50 and 80,000 N / m 2 , preferably between 10,000 and 30,000 N / m 2 . In conjunction with the desired gap widths, these negative pressure values keep the energy for the generation of negative pressure within reasonable limits. At the same time it is also ensured that the water can be fed into a, possibly higher collection container for receiving and for transporting the sucked water.
  • a structurally simple connection of the suction channel with a vacuum source results from the fact that the mouth of the suction channel is above the maximum water level in the reservoir and the reservoir has a connection for a vacuum source above the maximum water level.
  • the collecting container may be subdivided transversely to the fibrous web into a plurality of chambers, each with a separate connection for a vacuum source. This allows a control, preferably a homogenization of the negative pressure across the width of the fibrous web.
  • the suction channel is formed by one, transversely to the fibrous web extending upper and lower channel wall.
  • the channel walls extend at least in the initial region of the suction channel at an acute angle to the dewatering belt.
  • the edge of the lower duct wall should be located as close as possible to the dewatering belt, the distance preferably being less than 20 mm.
  • the edge may even touch the drainage tape or dip slightly into it. If the edge of the lower channel wall with the drainage tape comes in contact, so the execution of the same as a low-wear bar advantage.
  • the strip should form an angle between 10 and 45 ° with the drainage tape.
  • a water catcher is connected to the suction channel as part of the water absorption device. It is structurally simplistic that the upper channel wall itself is part of the water collection device.
  • the surface of the upper channel wall lying outside the suction channel should be inclined to the press nip, and the edge of the upper channel wall at least slightly less protrude into the gusset than that of the lower channel wall.
  • the trapped water on the outer surface of the upper channel wall runs back towards the press nip and can drip from the upper edge to the longer lower channel wall of the suction channel. From there, the discharge of this water takes place via the suction channel into the collecting container.
  • the arranged above the suction water collecting device can also have their own reservoir with a drain for the collected water.
  • the upper channel wall may also be advantageous to make the upper channel wall longer, so that it protrudes as far or further than the lower channel wall in the gusset. This increases the effect of the negative pressure on the dewatering belt.
  • the distance of the upper channel wall from the upper press roll should be a multiple of the gap width of the suction channel, so that the gusset is not vented at too high a speed.
  • the use of the water collecting device is possible in a variety of pressing arrangements. For example, under the fibrous web, a dewatering belt run through the press nip and run the press nip extended by the use of a shoe press roll.
  • FIG. 1 shows a schematic cross-sectional view of a water collecting device.
  • the press arrangement consists of a press nip for dewatering the fibrous web 38, which is formed by two press rolls 40, 42 pressed against one another and pressed against one another.
  • a dewatering belt 44 in the form of a press felt for receiving the squeezed water is guided through the press nip on both sides.
  • the press rolls 40, 42 are blind drilled and grooved, which is why they absorb a relatively large amount of water in the press nip, which is then spun off again after the press nip.
  • a water intake device 46 is located between the upper press roll 40 and the upper dewatering belt 44 arranged.
  • This water absorption device 46 is essentially formed by a, in the gusset between the upper press roll 40 and dewatering belt 44 and extending transversely to the fibrous web 38 extending suction channel 48, which is connected to a vacuum source.
  • the suction channel 48 has a gap width of about 4 mm.
  • the suction channel 48 leads into a collecting container 50 for receiving and removing the sucked-in water via a drain 52.
  • a negative pressure of approximately 20,000 N / m 2 prevails in the suction channel 48.
  • the slope of the suction channel 48 results in particular because the mouth 54 of the suction channel 48 is above the maximum water level in the collecting container 50.
  • the collecting container 50 also has above the maximum water level height a connection 56 for a vacuum source.
  • the suction channel 48 itself is formed by one, extending transversely to the fibrous web 38 upper 58 and lower 60 channel wall, the channel walls 58, 60 extend at least in the initial region of the suction channel 48 at an acute angle to the dewatering 44.
  • the edge 62 of the lower channel wall 60 touches the dewatering belt 44 or it dives slightly into the dewatering belt 44. Therefore, the edge 62 of the lower channel wall 60 is also formed by a low wear bar 64 made of ceramic.
  • the channel walls 58, 60 and the strip 64 form an angle of approximately 15 ° with the upper drainage band 44.
  • a water catcher 66 is arranged above the suction channel 48.
  • the upper channel wall 58 is here part of the water collecting device 66, wherein the lying outside the suction channel 48 surface of the upper channel wall 58 is inclined to the press nip and the edge 68 of the upper channel wall 58 protrudes slightly less into the gusset, than that of the lower channel wall 60th Dies it is achieved that the water collected and returned from the outer surface of the upper channel wall 58 from the edge 68 of the upper channel wall 58 to the lower channel wall 60 can drop from where the discharge via the suction channel 48 into the collecting container 50 takes place.
  • connection 56 leads to a further, preferably higher collection container, which is connected to the vacuum source.

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Description

Die Erfindung betrifft eine Pressenanordnung gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a press arrangement according to the preamble of claim 1.

Bei bisher üblichen Wasserabführeinrichtungen wird das Presswasser in der Regel durch Schwerkraft abgeführt. Insbesondere bei einer Verwendung für einen Oberfilz kann die in die Wanne abgeschleuderte Wassermenge nicht in jedem Fall seitlich durch die Schwerkraft zum Wannenrand strömen. Insbesondere dann, wenn der Abflussquerschnitt der Wanne zu klein ist und/oder die Wanne keine ausreichende Neigung besitzt, kann Wasser auf den Filz zurückfließen.In previously known water removal devices, the press water is usually removed by gravity. In particular, when used for an upper felt, the amount of water thrown off into the tub can not in each case flow laterally by gravity to the edge of the tub. In particular, if the drainage cross-section of the tub is too small and / or the tub does not have sufficient inclination, water can flow back to the felt.

Aus der DE 25 09 057 C3 ist bereits ein Saugkasten zum Absaugen von durch ein Sieb hindurchtretendes Wasser bekannt geworden, der durch eine mit Durchtrittsöffnungen versehene Trennwand in eine Wassersaugkammer und eine Luftsaugkammer unterteilt ist.From the DE 25 09 057 C3 A suction box for sucking water passing through a sieve has already become known, which is subdivided into a water suction chamber and an air suction chamber by a dividing wall provided with passages.

Ein Ziel der Erfindung ist es, eine verbesserte Wasserabführeinrichtung zu schaffen, bei der problemlos eine mit einer entsprechenden Platzersparnis einhergehende Verringerung des Abflussquerschnitts der Wanne möglich ist. Zudem soll ausgeschlossen sein, dass Wasser auf den Filz zurückfließt. Weiterhin soll es auch möglich sein, bei einem nur sehr geringen Gefälle in Querrichtung die anfallende Wassermenge problemlos abzuführen.An object of the invention is to provide an improved water drainage device, in which a reduction of the outflow cross section of the trough accompanied by a corresponding space saving is possible without problems. In addition, it should be ruled out that water flows back to the felt. Furthermore, it should also be possible to easily dissipate the accumulating amount of water with only a very small slope in the transverse direction.

Bei einer Pressenanordnung gemäss dem Oberbegriff des Anspruchs 1 muss das von den meist gerillten und/oder blindgebohrten Presswalzen abgeschleuderte Wasser nach dem Pressspalt aufgefangen und abgeführt werden. Ansonsten wird der größte Teil des abgeschleuderten Wassers von den endlos umlaufenden Entwässerungsbändem aufgenommen, was insbesondere bei dem oberen Entwässerungsband zur Wiederbefeuchtung der Faserstoffbahn führt. Hierzu dienen meist Wasserrinnen, die das abgeschleuderte Wasser auffangen und abführen.In a press arrangement according to the preamble of claim 1, the thrown off by the most grooved and / or blind drilled press rolls water after the press nip and must be removed. Otherwise, most of the thrown-off water is absorbed by the endless circulating Entwässerungsbändem, resulting in particular in the upper dewatering belt for rewetting of the fibrous web. This is usually done by gullies, which collect and remove the thrown off water.

Jedoch kann insbesondere in den Fällen, in denen das obere Entwässerungsband den Pressspalt etwa horizontal oder sogar steigend verlässt, die Wasserrinne nicht nahe genug am Pressspalt positioniert werden. Infolgedessen kann nur ein relativ geringer Anteil des abgeschleuderten Wassers der oberen Presswalze aufgefangen werden. Der Rest gelangt überwiegend in das obere Entwässerungsband, was dann zu der erwähnten, erheblichen Rückbefeuchtung der Faserstoffbahn führt.However, especially in cases where the upper dewatering belt leaves the press nip approximately horizontally or even rising, the gutter can not be positioned close enough to the press nip. As a result, only a relatively small proportion of the spun-off water of the upper press roll can be collected. The rest predominantly enters the upper dewatering belt, which then leads to the mentioned, considerable rewetting of the fibrous web.

Aus US-A-1423400 ist eine Pressenanordnung gemäss dem Oberbegriff des Anspruchs 1 bekannt.Out US-A-1423400 a press arrangement according to the preamble of claim 1 is known.

Ziel der Erfindung ist es daher, die Effizienz der Wasseraufnahmevorrichtung von Pressenanordnungen zu verbessern.The aim of the invention is therefore to improve the efficiency of the water intake device of press arrangements.

Erfindungsgemäß wird diese Aufgabe durch die Merkmale des Anspruchs 1 gelöst. Durch die Verwendung eines Saugkanals kann wesentlich mehr Wasser als mit einer Wasserrinne abgeführt werden. Dies gilt insbesondere für Pressenanordnungen mit einem oberen Entwässerungsband, welches nach dem Pressspalt etwa horizontal oder sogar steigend verläuft. Seine Begründung findet dies insbesondere darin, dass der Saugkanal sehr weit in den Zwickel geführt werden kann und der Unterdruck sehr viel Wasser in den Saugkanal zieht.According to the invention, this object is solved by the features of claim 1. By using a suction channel much more water than with a gutter can be dissipated. This is especially true for press arrangements with an upper dewatering belt, which runs approximately horizontally or even rising after the press nip. His reason is found in particular in the fact that the suction channel can be very far out in the gusset and the negative pressure draws a lot of water in the suction channel.

Zur Erfassung der Hauptrichtung des abgeschleuderten Wassers ist es ausreichend, wenn der Saugkanal zumindest im Anfangsbereich eine Spaltbreite von 1 bis 50 mm, vorzugsweise von 2 bis 7 mm hat. Vor allem bei einem ansteigenden Saugkanal ist zur Überwindung der Höhendifferenz durch das aufgenommene Wasser ein bestimmter minimaler Unterdruck im Saugkanal erforderlich. Der Unterdruck im Saugkanal sollte daher zwischen 50 und 80000 N/m2, vorzugsweise zwischen 10000 und 30000 N/m2 liegen. In Verbindung mit den angestrebten Spaltbreiten halten diese Unterdruckwerte die Energie für die Unterdruckerzeugung in vertretbaren Grenzen. Gleichzeitig wird auch gewährleistet, dass das Wasser in einen, unter Umständen höher gelegenen Sammelbehälter zur Aufnahme und zum Abtransport des angesaugten Wassers geführt werden kann. Eine konstruktiv einfache Verbindung des Saugkanals mit einer Unterdruckquelle ergibt sich dabei dadurch, dass die Mündung des Saugkanals über der maximalen Wasserstandshöhe im Sammelbehälter liegt und der Sammelbehälter über der maximalen Wasserstandshöhe einen Anschluss für eine Unterdruckquelle besitzt. Der Sammelbehälter kann quer zur Faserstoffbahn auch in mehrere Kammern mit je einem separaten Anschluss für eine Unterdruckquelle unterteilt sein. Dies ermöglicht eine Steuerung, vorzugsweise eine Vergleichmäßigung des Unterdrucks über die Breite der Faserstoffbahn.For detecting the main direction of the centrifuged water, it is sufficient if the suction channel, at least in the initial region has a gap width of 1 to 50 mm, preferably from 2 to 7 mm. Especially with a rising suction channel, a certain minimum negative pressure in the suction channel is required to overcome the height difference caused by the absorbed water. The negative pressure in the suction channel should therefore be between 50 and 80,000 N / m 2 , preferably between 10,000 and 30,000 N / m 2 . In conjunction with the desired gap widths, these negative pressure values keep the energy for the generation of negative pressure within reasonable limits. At the same time it is also ensured that the water can be fed into a, possibly higher collection container for receiving and for transporting the sucked water. A structurally simple connection of the suction channel with a vacuum source results from the fact that the mouth of the suction channel is above the maximum water level in the reservoir and the reservoir has a connection for a vacuum source above the maximum water level. The collecting container may be subdivided transversely to the fibrous web into a plurality of chambers, each with a separate connection for a vacuum source. This allows a control, preferably a homogenization of the negative pressure across the width of the fibrous web.

Im Hinblick auf den Herstellungsaufwand ist es erfindungsgemäß außerdem vorgesehen, dass der Saugkanal von je einer, quer zur Faserstoffbahn verlaufenden oberen und unteren Kanalwand gebildet wird. Um dabei einen Großteil des abgeschleuderten Wassers zu erfassen, verlaufen die Kanalwände zumindest im Anfangsbereich des Saugkanals im spitzen Winkel zum Entwässerungsband.With regard to the production effort, it is also provided according to the invention that the suction channel is formed by one, transversely to the fibrous web extending upper and lower channel wall. In order to capture a large part of the thrown off water, the channel walls extend at least in the initial region of the suction channel at an acute angle to the dewatering belt.

In Abhängigkeit von der Bahngeschwindigkeit, der Menge des abgeschleuderten Wassers und der Beschaffenheit des Entwässerungsbandes sollte die Kante der unteren Kanalwand möglichst nahe am Entwässerungsband angeordnet sein, wobei der Abstand vorzugsweise kleiner als 20 mm sein sollte. Die Kante kann das Entwässerungsband sogar berühren oder in dieses geringfügig eintauchen. Falls die Kante der unteren Kanalwand mit dem Entwässerungsband in Kontakt kommt, so ist die Ausführung derselben als verschleißarme Leiste von Vorteil. Dabei sollte die Leiste mit dem Entwässerungsband einen Winkel zwischen 10 und 45° bilden.Depending on the web speed, the amount of water thrown off and the nature of the dewatering belt, the edge of the lower duct wall should be located as close as possible to the dewatering belt, the distance preferably being less than 20 mm. The edge may even touch the drainage tape or dip slightly into it. If the edge of the lower channel wall with the drainage tape comes in contact, so the execution of the same as a low-wear bar advantage. The strip should form an angle between 10 and 45 ° with the drainage tape.

Um auch noch das über den Saugkanal in Rotationsrichtung der oberen Presswalze hinaus abgeschleuderte Wasser erfassen zu können, schließt sich an den Saugkanal eine Wasserauffangvorrichtung als Teil der Wasseraufnahmevorrichtung an. Dabei ist es konstruktiv vereinfachend, daß die obere Kanalwand selbst Teil der Wasserauffangvorrichtung ist. Darüber hinaus sollte die außerhalb des Saugkanals liegende Oberfläche der oberen Kanalwand zum Pressspalt geneigt verlaufen und die Kante der oberen Kanalwand zumindest geringfügig weniger in den Zwickel hineinragen als die der unteren Kanalwand. Dies führt dazu, dass das aufgefangene Wasser an der außen liegenden Oberfläche der oberen Kanalwand in Richtung Pressspalt zurück läuft und von der oberen Kante auf die längere untere Kanalwand des Saugkanals tropfen kann. Von dort erfolgt die Abführung dieses Wassers über den Saugkanal in den Sammelbehälter. Die über dem Saugkanal angeordnete Wasserauffangvorrichtung kann aber auch ihr eigenes Sammelbecken mit einem Abfluß für das aufgefangene Wasser besitzen.In order to be able to detect the water thrown off via the suction channel in the direction of rotation of the upper press roll, a water catcher is connected to the suction channel as part of the water absorption device. It is structurally simplistic that the upper channel wall itself is part of the water collection device. In addition, the surface of the upper channel wall lying outside the suction channel should be inclined to the press nip, and the edge of the upper channel wall at least slightly less protrude into the gusset than that of the lower channel wall. As a result, the trapped water on the outer surface of the upper channel wall runs back towards the press nip and can drip from the upper edge to the longer lower channel wall of the suction channel. From there, the discharge of this water takes place via the suction channel into the collecting container. The arranged above the suction water collecting device can also have their own reservoir with a drain for the collected water.

Es kann jedoch auch von Vorteil sein, die obere Kanalwand länger auszuführen, so dass diese genauso weit oder weiter als die untere Kanalwand in den Zwickel ragt. Dies erhöht die Wirkung des Unterdrucks auf das Entwässerungsband.However, it may also be advantageous to make the upper channel wall longer, so that it protrudes as far or further than the lower channel wall in the gusset. This increases the effect of the negative pressure on the dewatering belt.

Der Abstand der oberen Kanalwand von der oberen Presswalze sollte ein Vielfaches der Spaltbreite des Saugkanals betragen, damit der Zwickel nicht mit zu hoher Geschwindigkeit belüftet wird.The distance of the upper channel wall from the upper press roll should be a multiple of the gap width of the suction channel, so that the gusset is not vented at too high a speed.

Der Einsatz der Wasseraufnahmevorrichtung ist bei den unterschiedlichsten Pressanordnungen möglich. Beispielsweise kann auch unter der Faserstoffbahn ein Entwässerungsband durch den Pressspalt verlaufen und der Pressspalt durch den Einsatz einer Schuhpresswalze verlängert ausgeführt werden.The use of the water collecting device is possible in a variety of pressing arrangements. For example, under the fibrous web, a dewatering belt run through the press nip and run the press nip extended by the use of a shoe press roll.

Die Erfindung wird im folgenden anhand von einem Ausführungsbeispiel näher erläutert. Hierzu zeigt die Figur eine schematische Querschnittsdarstellung einer Wasseraufnahmevorrichtung.The invention will be explained in more detail below with reference to an embodiment. For this purpose, the figure shows a schematic cross-sectional view of a water collecting device.

Die Pressenanordnung besteht aus einem Pressspalt zur Entwässerung der Faserstoffbahn 38, der von zwei übereinander angeordneten und gegeneinander gepressten Presswalzen 40, 42 gebildet wird. Neben der Faserstoffbahn 38 wird beidseitig je ein Entwässerungsband 44 in Form eines Pressfilzes zur Aufnahme des ausgepressten Wassers durch den Pressspalt geführt.The press arrangement consists of a press nip for dewatering the fibrous web 38, which is formed by two press rolls 40, 42 pressed against one another and pressed against one another. In addition to the fibrous web 38, a dewatering belt 44 in the form of a press felt for receiving the squeezed water is guided through the press nip on both sides.

Die Presswalzen 40, 42 sind blindgebohrt und gerillt ausgeführt, weswegen sie im Pressspalt relativ viel Wasser aufnehmen, was nach dem Pressspalt dann wieder abgeschleudert wird. Um zu verhindern, dass das, von der oberen Presswalze 40 abgeschleuderte Wasser in relativ großem Umfang in das obere Entwässerungsband 44 gelangt, was zu einer erheblichen Wiederbefeuchtung der Faserstoffbahn 38 führen würde, ist zwischen der oberen Presswalze 40 und dem oberen Entwässerungsband 44 eine Wasseraufnahmevorrichtung 46 angeordnet.The press rolls 40, 42 are blind drilled and grooved, which is why they absorb a relatively large amount of water in the press nip, which is then spun off again after the press nip. In order to prevent the water spun off from the upper press roll 40 from entering the upper dewatering belt 44 to a relatively large extent, which would result in considerable rewetting of the fibrous web 38, a water intake device 46 is located between the upper press roll 40 and the upper dewatering belt 44 arranged.

Diese Wasseraufnahmevorrichtung 46 wird im wesentlichen von einem, in den Zwickel zwischen oberer Presswalze 40 und Entwässerungsband 44 hineinragenden und quer zur Faserstoffbahn 38 verlaufenden Saugkanal 48 gebildet, welcher mit einer Unterdruckquelle verbunden ist.This water absorption device 46 is essentially formed by a, in the gusset between the upper press roll 40 and dewatering belt 44 and extending transversely to the fibrous web 38 extending suction channel 48, which is connected to a vacuum source.

Auch bei der hier gezeigten horizontalen Führung des oberen Entwässerungsbandes 44 erlaubt der Saugkanal 48 eine effiziente Erfassung und Abführung des Hauptteiles des abgeschleuderten Wassers der oberen Presswalze 40. Dabei hat der Saugkanal 48 eine Spaltbreite von etwa 4 mm. Der Saugkanal 48 führt in einen Sammelbehälter 50 zur Aufnahme und zum Abtransport des angesaugten Wassers über einen Abfluss 52. Damit das Wasser die Steigung des Saugkanals 48 überwinden kann, herrscht im Saugkanal 48 ein Unterdruck von ca. 20000 N/m2. Die Steigung des Saugkanals 48 ergibt sich insbesondere deshalb, weil die Mündung 54 des Saugkanals 48 über der maximalen Wasserstandshöhe im Sammelbehälter 50 liegt. Zur Unterdruckerzeugung im Saugkanal 48 besitzt der Sammelbehälter 50 ebenfalls über der maximalen Wasserstandshöhe einen Anschluss 56 für eine Unterdruckquelle.Also in the horizontal guide shown here of the upper dewatering belt 44 allows the suction channel 48 an efficient detection and removal of the main part of the thrown off water of the upper press roll 40. In this case, the suction channel 48 has a gap width of about 4 mm. The suction channel 48 leads into a collecting container 50 for receiving and removing the sucked-in water via a drain 52. In order for the water to be able to overcome the gradient of the suction channel 48, a negative pressure of approximately 20,000 N / m 2 prevails in the suction channel 48. The slope of the suction channel 48 results in particular because the mouth 54 of the suction channel 48 is above the maximum water level in the collecting container 50. For generating negative pressure in the suction channel 48, the collecting container 50 also has above the maximum water level height a connection 56 for a vacuum source.

Der Saugkanal 48 selbst wird von je einer, quer zur Faserstoffbahn 38 verlaufenden oberen 58 und unteren 60 Kanalwand gebildet, wobei die Kanalwände 58, 60 zumindest im Anfangsbereich des Saugkanals 48 in einem spitzen Winkel zum Entwässerungsband 44 verlaufen. Um dabei möglichst viel abgeschleudertes Wasser erfassen und sogar vom Entwässerungsband 44 abschaben zu können, berührt die Kante 62 der unteren Kanalwand 60 das Entwässerungsband 44 oder sie taucht geringfügig in das Entwässerungsband 44 ein. Daher wird die Kante 62 der unteren Kanalwand 60 auch von einer verschleißarmen Leiste 64 aus Keramik gebildet.The suction channel 48 itself is formed by one, extending transversely to the fibrous web 38 upper 58 and lower 60 channel wall, the channel walls 58, 60 extend at least in the initial region of the suction channel 48 at an acute angle to the dewatering 44. In order to detect as much thrown off water and even to be able to scrape off the dewatering belt 44, the edge 62 of the lower channel wall 60 touches the dewatering belt 44 or it dives slightly into the dewatering belt 44. Therefore, the edge 62 of the lower channel wall 60 is also formed by a low wear bar 64 made of ceramic.

Zur Erfassung des Hauptanteils des abgeschleuderten Wassers bilden die Kanalwände 58, 60 sowie die Leiste 64 mit dem oberen Entwässerungsband 44 einen Winkel von ca. 15°.To detect the majority of the thrown-off water, the channel walls 58, 60 and the strip 64 form an angle of approximately 15 ° with the upper drainage band 44.

Um das in Rotationsrichtung der oberen Presswalze 40 über den Saugkanal 48 hinaus geschleuderte Wasser auffangen zu können, ist über dem Saugkanal 48 eine Wasserauffangvorrichtung 66 angeordnet. Die obere Kanalwand 58 ist hier Teil der Wasserauffangvorrichtung 66, wobei die außerhalb des Saugkanals 48 liegende Oberfläche der oberen Kanalwand 58 zum Pressspalt geneigt verläuft und die Kante 68 der oberen Kanalwand 58 geringfügig weniger in den Zwickel hineinragt, als die der unteren Kanalwand 60. Hierdurch wird erreicht, dass das von der äußeren Oberfläche der oberen Kanalwand 58 aufgefangene und zurückfließende Wasser von der Kante 68 der oberen Kanalwand 58 auf die untere Kanalwand 60 tropfen kann, von wo die Abführung über den Saugkanal 48 in den Sammelbehälter 50 erfolgt.In order to be able to catch the water thrown over the suction channel 48 in the direction of rotation of the upper press roll 40, a water catcher 66 is arranged above the suction channel 48. The upper channel wall 58 is here part of the water collecting device 66, wherein the lying outside the suction channel 48 surface of the upper channel wall 58 is inclined to the press nip and the edge 68 of the upper channel wall 58 protrudes slightly less into the gusset, than that of the lower channel wall 60th Dies it is achieved that the water collected and returned from the outer surface of the upper channel wall 58 from the edge 68 of the upper channel wall 58 to the lower channel wall 60 can drop from where the discharge via the suction channel 48 into the collecting container 50 takes place.

In Abhängigkeit vom vorhandenen Einbauraum, der anfallenden Wassermenge sowie der gesamten Konstruktion ist es auch möglich, dass der Anschluss 56 in einen weiteren, vorzugsweise höher gelegenen Sammelbehälter führt, welcher mit der Unterdruckquelle verbunden ist.Depending on the existing installation space, the amount of water accumulated and the entire construction, it is also possible that the connection 56 leads to a further, preferably higher collection container, which is connected to the vacuum source.

Claims (12)

  1. Press arrangement for dewatering a fibrous web (38), in particular a paper, board or tissue web, in a machine for the production and/or finishing of the same, comprising at least one pressure nip formed by two press rolls (40, 42) arranged one above the other and pressed against each other, through which, in addition to the fibrous web (38), at least one dewatering belt (44) running above the fibrous web (38) is led in order to pick up the water pressed out, a water interceptor (46) being arranged between the upper press roll (40) and the dewatering belt (44) and the water interceptor (46) being formed by at least one suction channel (48) projecting into the pocket between the upper press roll (40) and the dewatering belt (44) and running transversely with respect to the fibrous web (38) and which is connected to a vacuum source, the suction channel (48) being formed by an upper (58) and lower (60) channel wall in each case running transversely with respect to the fibrous web (38), characterized in that the channel walls (58, 60) run at an acute angle to the dewatering belt (44), at least in the initial region of the suction channel (48), and the upper channel wall (58) is part of a water interceptor (66) for the water thrown out by the upper press roll (40) above the suction channel (48).
  2. Press arrangement according to Claim 1, characterized in that, at least in the receiving region, the suction channel (48) has a gap width of 1 to 50 mm, preferably of 2 to 7 mm.
  3. Press arrangement according to Claim 1 or 2, characterized in that, at least in the initial region of the suction channel (48), a vacuum of 50 to 80 000 N/m2, preferably of 10 000 to 30 000 N/m2, prevails.
  4. Press arrangement according to one of the preceding claims, characterized in that the suction channel (48) leads into a collecting container (50) to pick up and transport away the water sucked in.
  5. Press arrangement according to Claim 4, characterized in that the mouth (54) of the suction channel (48) is located above the maximum water level in the collecting container (50), and the collecting container (50) has a connection (56) above the maximum water level for a vacuum source.
  6. Press arrangement according to one of the preceding claims, characterized in that the edge (62) of the lower channel wall (60) is arranged as close as possible to the dewatering belt (44), the distance preferably being less than 20 mm.
  7. Press arrangement according to one of Claims 1 to 5, characterized in that the edge (62) of the lower channel wall (60) touches the dewatering belt (44) or even dips slightly into the latter.
  8. Press arrangement according to Claim 7, characterized in that the edge (62) of the lower channel wall (60) is formed by a strip (64) which exhibits as little wear as possible.
  9. Press arrangement according to Claim 8, characterized in that the strip (64) forms an angle between 10 and 45° with the dewatering belt (44).
  10. Press arrangement according to one of the preceding claims, characterized in that the surface of the upper channel wall (58) that is located outside the suction channel (48) runs at an angle to the pressure nip, and the edge (68) of the upper channel wall (58) projects at least slightly less into the pocket than that of the lower channel wall (60).
  11. Press arrangement according to one of Claims 1 to 9, characterized in that the edge of the upper channel wall (58) projects into the pocket exactly as far as or further than the lower channel wall (60).
  12. Press arrangement according to one of Claims 4 to 11, characterized in that the collecting container (50) is subdivided transversely with respect to the fibrous web (38) into a plurality of chambers each having a connection (56) for a vacuum source.
EP05108375A 2000-01-14 2000-12-21 Pressing arrangement Expired - Lifetime EP1619300B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE20000599U DE20000599U1 (en) 2000-01-14 2000-01-14 Water drainage device
DE10014873A DE10014873A1 (en) 2000-01-14 2000-03-24 Web roller press station has a water extraction system with a suction channel aligned at the press blanket to pick up extracted water to be passed to a collection vessel for disposal
EP00128157A EP1116822B1 (en) 2000-01-14 2000-12-21 Device for discharging water

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP00128157A Division EP1116822B1 (en) 2000-01-14 2000-12-21 Device for discharging water

Publications (2)

Publication Number Publication Date
EP1619300A1 EP1619300A1 (en) 2006-01-25
EP1619300B1 true EP1619300B1 (en) 2007-10-24

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EP (1) EP1619300B1 (en)
DE (1) DE20000599U1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10014873A1 (en) * 2000-01-14 2001-07-19 Voith Paper Patent Gmbh Web roller press station has a water extraction system with a suction channel aligned at the press blanket to pick up extracted water to be passed to a collection vessel for disposal
DE10108517A1 (en) * 2001-02-22 2002-08-29 Voith Paper Patent Gmbh Moisture profile
CN105714592B (en) * 2016-04-22 2017-05-03 浙江荣晟环保纸业股份有限公司 Pressing device for papermaking industry

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1423400A (en) * 1922-07-18 Attachment for paper-making machines
US2165549A (en) * 1935-11-29 1939-07-11 Beloit Iron Works Paper machine suction slice
US3355350A (en) * 1964-12-18 1967-11-28 Allis Chalmers Mfg Co Paper machine
FI885606A (en) * 1988-12-01 1990-06-02 Ahlstroem Valmet BANFORMNINGSFOERFARANDE OCH ANORDNING.

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EP1619300A1 (en) 2006-01-25
DE20000599U1 (en) 2000-05-11

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