EP0168718A2 - Drainage fabric for presses in the wet end section of a paper machine - Google Patents

Drainage fabric for presses in the wet end section of a paper machine Download PDF

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Publication number
EP0168718A2
EP0168718A2 EP85108267A EP85108267A EP0168718A2 EP 0168718 A2 EP0168718 A2 EP 0168718A2 EP 85108267 A EP85108267 A EP 85108267A EP 85108267 A EP85108267 A EP 85108267A EP 0168718 A2 EP0168718 A2 EP 0168718A2
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EP
European Patent Office
Prior art keywords
top layer
drainage
belt according
belt
layer
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EP85108267A
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German (de)
French (fr)
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EP0168718B2 (en
EP0168718A3 (en
EP0168718B1 (en
Inventor
Franz-Ferdinand Dipl.-Kfm. Kufferath
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KUFFERATH, FRANZ. F., DIPL.-KFM.
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Andreas Kufferath GmbH and Co KG
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Application filed by Andreas Kufferath GmbH and Co KG filed Critical Andreas Kufferath GmbH and Co KG
Priority to AT85108267T priority Critical patent/ATE53870T1/en
Publication of EP0168718A2 publication Critical patent/EP0168718A2/en
Publication of EP0168718A3 publication Critical patent/EP0168718A3/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
    • D21F1/0027—Screen-cloths
    • D21F1/0036—Multi-layer screen-cloths
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S162/00—Paper making and fiber liberation
    • Y10S162/90—Papermaking press felts

Definitions

  • the invention relates to a drainage belt for presses in the wet end of a paper machine, which has the features of the preamble of claim 1.
  • the paper web is guided on a dewatering belt or lying between two dewatering belts through the press nip of at least one wet press, which presses part of the water contained in the paper web out of the paper web by mechanical pressure.
  • the drainage belt or the drainage belts have the task of absorbing the water pressed out of the paper web.
  • the dewatering capacity of the dewatering belt designed in this way is fully utilized, i.e. the dewatering belt limits the performance of the wet press.
  • the working speed of the paper machines has not yet reached an upper limit.
  • the invention has for its object to provide a dewatering belt for presses in the wet end of a paper machine, which makes it possible to increase the dewatering performance of a wet press. This problem is solved by a drainage belt with the features of claim 1.
  • Such a drainage belt does not lose its openness in the press nip under pressure. Therefore, the water absorption capacity is not only increased by the formation of the top layer as a sieve fabric, but above all also by the fact that the water absorption capacity of the entire drainage belt can be fully used. It is therefore only necessary to select the open space of the dewatering belt at least so large that it can absorb all the water removed from the paper web in the press nip in order to increase the performance of the press.
  • the permeable layer can also speed of the drainage belt can be adjusted without difficulty so that no critical hydraulic pressure leading to the destruction of the paper web can build up in the press nip.
  • Another advantage of the drainage belt according to the invention is that the water stored in it can easily be removed again by centrifugal force when deflecting around a roller or by suction.
  • the drainage belt according to the invention also prevents rewetting of the paper web, that is to say a backflow of the water from the drainage belt into the paper web when it emerges from the press nip, much more than the known drainage belts.
  • the drainage belt according to the invention which not only enables a vertical drainage flow, but also a transverse drainage flow, allows the design of the top layer and the support belt and the interaction of the two parts to control the water absorption in a wide range and thus optimize the drainage performance under different conditions. It also helps improve sheet formation. For example, fluctuations in the basis weight of the paper web can be avoided by the uniform dewatering performance over the entire range. In addition, the printability of the paper web is evened out, i.e. the properties of the two sides of the paper web that are essential for the printability are brought closer to one another.
  • Another advantage of the drainage belt according to the invention can be seen in the fact that its drainage is possible with less energy consumption than with the commonly used wet felts.
  • the drainage channels of the top layer can ver towards the support band enlarge. This is also advantageous with regard to the least possible rewetting of the paper web.
  • the permeability of the support band for water and air is advantageously greater than that of the top layer.
  • the permeability of the two layers is preferably matched to one another in such a way that it corresponds to a funnel which is open towards the underside of the support band and faces away from the upper layer.
  • the number of drainage channels in the top layer is greater than in the support band. It is also advantageous if the screen fabric of the top layer has a substantially smaller thickness than that of the support band.
  • both the top layer and the support band can be adapted particularly well to the requirements if the top layer and / or the support band are of multi-layer construction, the individual layers being able to have different designs.
  • the dewatering belt is made up of four cross-thread layers arranged one above the other, of which the uppermost cross-thread layer coming into contact with the paper web is 1, the cross-thread layer directly below this is 2, the cross-thread layer below the latter is 3 and the the bottom transverse thread layer forming the running side of the drainage belt is designated by 4.
  • the top cross Thread layer 1 has 28 cross threads per cm with a diameter of 0.15 mm.
  • the course of the wires of this first longitudinal thread system 5 can be seen from the drawing. Two adjacent threads of the topmost transverse thread layer 1 are bound in each case.
  • the longitudinal wire then runs through between the next transverse thread of the uppermost transverse thread layer 1 and the transverse thread of the layer 2 aligned with this transverse thread, then binds in a thread of the first intermediate layer 2 and then again runs over three transverse threads between the uppermost layer 1 and the first intermediate layer 2 through.
  • the diameter of the transverse threads of the uppermost transverse thread layer 1 is less than the diameter of the threads of the first intermediate layer 2, the fact that the longitudinal threads are more strongly integrated into the uppermost transverse thread layer 1 reduces their openness to the first intermediate layer 2. Since approximately 50 31 of the longitudinal threads of the first longitudinal thread system 5, based on their total length, run between the uppermost transverse thread layer 1 and the immediately below first intermediate layer 2, between these two layers, which together form the upper layer of the drainage belt, a first flow channel system in the belt longitudinal direction created. The topmost transverse thread layer 1 and the first intermediate layer connected to it by the first longitudinal thread system 5 have an open space for water storage of approximately 50% of their volume.
  • the integral permeability of both layers, measured by the air passage, is 1420 1 / m 2 s at a vacuum of 10 mm WS.
  • the transverse thread layer 3 lying under the first intermediate layer 2, which can also be referred to as the second intermediate layer, has 14 transverse threads per cm with a diameter of 0.30 mm.
  • the transverse threads of the lowermost transverse thread system 4 are arranged exactly below those of the second intermediate layer, so that the lowest transverse thread layer 4 also has 14 transverse threads per cm. However, the thread diameter here is 0.35 mm.
  • the second intermediate layer 3 and the lowermost transverse thread layer 4, which together form the support band, are connected to one another by a second longitudinal thread system 6, which has 35 longitudinal threads per cm, the thread diameter being 0.27 mm.
  • the integration of the threads of the second intermediate layer and that of the lowermost transverse thread layer by the second longitudinal thread system 6 is, as the figure shows, carried out in the same way as in the uppermost transverse thread layer 1 and the first intermediate layer 2.
  • the longitudinal thread system 6 binds more strongly into the second intermediate layer 3, which has the consequence that the fabric opens from the second intermediate layer to the bottom transverse thread layer 4 also in the support band.
  • the fabric part of the drainage belt consisting of the second intermediate layer 3 and the lowest transverse thread layer 4 has an integral, open screen space of 60% with a total permeability of 2500 l / m 2 s.
  • All four transverse thread layers 1 to 4 are connected to one another along their longitudinal edge by a third longitudinal thread system (not shown for reasons of clarity) with a small number of threads.
  • This third longitudinal thread system consists of twisted wire, which has a diameter of 0.15 mm.
  • the drainage tape formed in the above manner has a total thickness of 1.6 mm. Of this, 0.25 mm is applied to the top transverse thread layer 1, 0.30 mm to the first intermediate layer immediately below, 0.45 mm to the second intermediate layer and 0.6 mm to the lowest transverse thread layer.
  • the openness of the drainage belt is well over 50% and it is almost incompressible.

Landscapes

  • Paper (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Abstract

Bei einem Entwässerungsband für Pressen in der Naßpartie einer Papiermaschine, das aus einem porösen Stützband (3, 4) in Form eines Siebgewebes und einer feinporigen Oberlage (1, 2) auf der der Papierbahn zugewandten Seite des Stützbandes (3, 4) besteht, ist die Oberlage (1, 2) durch ein formbeständige Entwässerungskanäle bildendes, monoplanes Siebgewebe gebildet.In the case of a dewatering belt for presses in the wet end of a paper machine, which consists of a porous support belt (3, 4) in the form of a screen fabric and a fine-pored top layer (1, 2) on the side of the support belt (3, 4) facing the paper web the top layer (1, 2) is formed by a monoplane screen fabric that forms dimensionally stable drainage channels.

Description

Die Erfindung betrifft ein Entwässerungsband für Pressen in der Naßpartie einer Papiermaschine, das die Merkmale des Oberbegriffs des Anspruchs 1 aufweist.The invention relates to a drainage belt for presses in the wet end of a paper machine, which has the features of the preamble of claim 1.

In der Naßpressenpartie einer Papiermaschine wird die Papierbahn auf einem Entwässerungsband liegend oder zwischen zwei Entwässerungsbändern liegend durch den Pressenspalt wenigstens einer Naßpresse geführt, welche durch mechanischen Druck einen Teil des in der Papierbahn enthaltenen Wassers aus der Papierbahn herauspreßt. Das Entwässerungsband oder die Entwässerungsbänder haben dabei die Aufgabe, das aus der Papierbahn herausgepreßte Wasser aufzunehmen.In the wet press section of a paper machine, the paper web is guided on a dewatering belt or lying between two dewatering belts through the press nip of at least one wet press, which presses part of the water contained in the paper web out of the paper web by mechanical pressure. The drainage belt or the drainage belts have the task of absorbing the water pressed out of the paper web.

Um die Entwässerungsleistung einer Naßpresse zu erhöhen, ist es bekannt, dem an der Papierbahn anliegenden Naßfilz ein poröses Sieb zu unterlegen und dieses als separates Element durch den Preßspalt laufen zu lassen. Der Naßfilz bildet dabei eine feinporige Oberlage und das Sieb ein poröses Stützband.In order to increase the dewatering performance of a wet press, it is known to place a porous sieve under the wet felt lying on the paper web and to let it run through the press nip as a separate element. The wet felt forms a fine-pored top layer and the sieve a porous support band.

In modernen Naßpressen wird die Entwässerungsleistung des in dieser Weise ausgebildeten Entwässerungsbandes voll ausgenutzt, d.h., das Entwässerungsband begrenzt die Leistungsfähigkeit der Naßpresse. Die Arbeitsgeschwindigkeit der Papiermaschinen hat jedoch bisher noch keine Obergrenze erreicht. Ferner ist es zur Einsparung von Dampf und damit Energie in der Trockenpartie erwünscht, den Trockengehalt der Papierbahn beim Verlassen der Naßpressenpartie zu erhöhen. Die hierzu erforderliche höhere Leistungsfähigkeit der Naßpressenpartie läßt sich derzeit nur durch eine Vergrößerung der Anzahl der Naßpressen erreichen, was einen erheblichen Aufwand bedeutet. Dies gilt auch bei Verwendung eines anderen bekannten Entwässerungsbandes, das als Stützband ein Siebgewebe und das als Oberlage eine mittels eines Laserstrahls perforierte Folie hat, da auch dessen Entwässerungsleistung diejenige eines Entwässerungsbandes mit einem Filz als Oberlage nicht überschreitet.In modern wet presses, the dewatering capacity of the dewatering belt designed in this way is fully utilized, i.e. the dewatering belt limits the performance of the wet press. However, the working speed of the paper machines has not yet reached an upper limit. Furthermore, in order to save steam and thus energy in the dryer section, it is desirable to increase the dry content of the paper web when leaving the wet press section. The higher performance of the wet press section required for this can currently only be achieved by increasing the number of wet presses, which means considerable effort. This also applies when another known drainage belt is used, which has a sieve fabric as the support belt and which has a film perforated by means of a laser beam as the top layer, since its drainage capacity also does not exceed that of a drainage belt with a felt as the top layer.

Der Erfindung liegt die Aufgabe zugrunde, ein Entwässerungsband für Pressen in der Naßpartie einer Papiermaschine zu schaffen, das es ermöglicht, die Entwässerungsleistung einer Naßpresse zu erhöhen. Diese Aufgabe löst ein Entwässerungsband mit den Merkmalen des Anspruchs 1.The invention has for its object to provide a dewatering belt for presses in the wet end of a paper machine, which makes it possible to increase the dewatering performance of a wet press. This problem is solved by a drainage belt with the features of claim 1.

Ein derartiges Entwässerungsband verliert im Pressenspalt unter Druck nicht seine Offenheit. Daher wird die Wasseraufnahmefähigkeit nicht nur durch die Ausbildung der Oberlage als Siebgewebe erhöht, sondern vor allem auch dadurch, daß die Wasseraufnahmefähigkeit des gesamten Entwässerungsbandes voll genutzt werden kann. Es braucht deshalb der offene Raum des Entwässerungsbandes nur mindestens so groß gewählt zu werden, daß er alles im Pressenspalt aus der Papierbahn entfernte Wasser aufnehmen kann, um die Leistungsfähigkeit der Presse zu erhöhen. Da die Oberlage dank der Ausbildung als ein formbeständige Entwässerungskanäle bildendes, monoplanes Siebgewebe ihre Offenheit im Pressenspalt nicht verliert, kann auch die Durchlässigkeit des Entwässerungsbandes ohne Schwierigkeiten so eingestellt werden, daß sich kein kritischer, zu einer Zerstörung der Papierbahn führender hydraulischer Druck im Pressenspalt aufbauen kann. Ein weiterer Vorteil des erfindungsgemäßen Entwässerungsbandes besteht darin, daß sich das in ihm gespeicherte Wasser leicht wieder durch Fliehkraft beim Umlenken um eine Walze oder durch Absaugen entfernen läßt. Schließlich verhindert das erfindungsgemäße Entwässerungsband auch wesentlich stärker als die bekannten Entwässerungsbänder eine Rückfeuchtung der Papierbahn, d.h. ein Rückströmen des Wassers aus dem Entwässerungsband in die Papierbahn beim Austritt aus dem Pressenspalt.Such a drainage belt does not lose its openness in the press nip under pressure. Therefore, the water absorption capacity is not only increased by the formation of the top layer as a sieve fabric, but above all also by the fact that the water absorption capacity of the entire drainage belt can be fully used. It is therefore only necessary to select the open space of the dewatering belt at least so large that it can absorb all the water removed from the paper web in the press nip in order to increase the performance of the press. Since the top layer does not lose its openness in the press nip thanks to the formation of a monoplane screen fabric that forms a shape-retaining drainage channel, the permeable layer can also speed of the drainage belt can be adjusted without difficulty so that no critical hydraulic pressure leading to the destruction of the paper web can build up in the press nip. Another advantage of the drainage belt according to the invention is that the water stored in it can easily be removed again by centrifugal force when deflecting around a roller or by suction. Finally, the drainage belt according to the invention also prevents rewetting of the paper web, that is to say a backflow of the water from the drainage belt into the paper web when it emerges from the press nip, much more than the known drainage belts.

Das erfindungsgemäße Entwässerungsband, das nicht nur eine vertikale Entwässerungsströmung, sondern auch eine transversale Entwässerungsströmung ermöglicht, erlaubt durch die Gestaltung der Oberlage und des Stützbandes sowie das Zusammenwirken beider Teile in einem weiten Rahmen eine Steuerung der Wasseraufnahme und damit eine Optimierung der Entwässerungsleistung bei unterschiedlichen Bedingungen. Ferner trägt es zu einer Verbesserung der Blattbildung bei. Beispielsweise können durch die gleichmäßige Entwässerungsleistung über die gesamte Bandbreite Flächengewichtsschwankungen der Papierbahn vermieden werden. Außerdem wird die Bedruckbarkeit der Papierbahn vergleichmäßigt, d.h., daß die für die Bedruckbarkeit wesentlichen Eigenschaften der beiden Papierbahnseiten aneinander angenähert werden.The drainage belt according to the invention, which not only enables a vertical drainage flow, but also a transverse drainage flow, allows the design of the top layer and the support belt and the interaction of the two parts to control the water absorption in a wide range and thus optimize the drainage performance under different conditions. It also helps improve sheet formation. For example, fluctuations in the basis weight of the paper web can be avoided by the uniform dewatering performance over the entire range. In addition, the printability of the paper web is evened out, i.e. the properties of the two sides of the paper web that are essential for the printability are brought closer to one another.

Ein weiterer Vorteil des erfindungsgemäßen Entwässerungsbandes ist darin zu sehen, daß seine Entwässerung mit geringerem Energieverbrauch möglich ist als bei den üblicherweise verwendeten Naßfilzen.Another advantage of the drainage belt according to the invention can be seen in the fact that its drainage is possible with less energy consumption than with the commonly used wet felts.

Zur weiteren Verbesserung der Entwässerungsleistung können die Entwässerungskanäle der Oberlage sich zum Stützband hin vergrößern. Dies ist auch im Hinblick auf eine möglichst geringe Rückfeuchtung der Papierbahn von Vorteil. Ferner ist vorteilhafterweise die Durchlässigkeit des Stützbandes für Wasser und Luft größer als diejenige der Oberlage. Vorzugsweise wird die Durchlässigkeit beider Lagen so aufeinander abgestimmt, daß sie einem sich zu der Oberlage abgekehrten Unterseite des Stützbandes hin offenen Trichter entspricht.To further improve the drainage performance, the drainage channels of the top layer can ver towards the support band enlarge. This is also advantageous with regard to the least possible rewetting of the paper web. Furthermore, the permeability of the support band for water and air is advantageously greater than that of the top layer. The permeability of the two layers is preferably matched to one another in such a way that it corresponds to a funnel which is open towards the underside of the support band and faces away from the upper layer.

Die Anzahl der Entwässerungskanäle in der Oberlage ist bei einer bevorzugten Ausführungsform größer als im Stützband. Ferner ist es vorteilhaft, wenn das Siebgewebe der Oberlage eine wesentlich geringere Dicke als diejenige des Stützbandes aufweist.In a preferred embodiment, the number of drainage channels in the top layer is greater than in the support band. It is also advantageous if the screen fabric of the top layer has a substantially smaller thickness than that of the support band.

Die Eigenschaften sowohl der Oberlage als auch des Stützbandes lassen sich besonders gut an die Erfordernisse anpassen, wenn die Oberlage und/oder das Stützband mehrlagig ausgebildet sind, wobei die einzelnen Lagen eine unterschiedliche Ausbildung haben können.The properties of both the top layer and the support band can be adapted particularly well to the requirements if the top layer and / or the support band are of multi-layer construction, the individual layers being able to have different designs.

Andere vorteilhafte Ausgestaltungen des erfindungsgemäßen Entwässerungsbandes sind Gegenstände weiterer Unteransprüche.Other advantageous embodiments of the drainage belt according to the invention are the subject of further dependent claims.

Im folgenden ist die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispiels im einzelnen erläutert. Die einzige Figur zeigt einen unvollständig dargestellten Längsschnitt des Ausführungsbeispiels.The invention is explained in detail below using an exemplary embodiment shown in the drawing. The single figure shows an incompletely shown longitudinal section of the embodiment.

Wie die Figur zeigt, ist das Entwässerungsband aus vier übereinander angeordneten Querfädenlagen aufgebaut, von denen die oberste, in Anlage an die Papierbahn kommende Querfädenlage mit 1, die unmittelbar unter dieser liegende Querfädenlage mit 2, die unter der letztgenannten Lage liegende Querfädenlage mit 3 und die die Laufseite des Entwässerungsbandes bildende, unterste Querfädenlage mit 4 bezeichnet ist. Die oberste Querfädenlage 1 weist 28 Querfäden pro cm mit einem Durchmesser von 0,15 mm auf. Die Fäden der unmittelbar unter ihr liegenden Querfädenlage 2, die einen Durchmesser von 0,18 mm haben, liegen exakt unter den Querfäden der obersten Lage 1. Die oberste Querfädenlage 1 und die darunterliegende Querfädenlage 2, die auch als erste Zwischenlage bezeichnet werden kann, sind durch ein erstes Längsfadensystem 5 miteinander verbunden, das aus 72 Längsdrähten mit einem Durchmesser von 0,15 mm besteht. Der Verlauf der Drähte dieses ersten Längsfadensystems 5 ist aus der Zeichnung ersichtlich. Es werden jeweils zwei nebeneinander liegende Fäden der obersten Querfädenlage 1 eingebunden. Sodann verläuft der Längsdraht zwischen dem nächsten Querfaden der obersten Querfadenlage 1 und dem auf diesen Querfaden ausgerichteten Querfaden der Lage 2 hindurch, bindet sodann einen Faden der ersten Zwischenlage 2 ein und verläuft dann wieder über drei Querfäden hinweg zwischen der obersten Lage 1 und der ersten Zwischenlage 2 hindurch. Obwohl der Durchmesser der Querfäden der obersten Querfadenlage 1 geringer ist als der Durchmesser der Fäden der ersten Zwischenlage 2, wird durch das verstärkte Einbinden der Längsfäden in die oberste Querfädenlage 1 deren Offenheit gegenüber der ersten Zwischenlage 2 vermindert. Da die Längsfäden des ersten Längsfadensystems 5 zu etwa 50 31, bezogen auf ihre Gesamtlänge, zwischen der obersten Querfädenlage 1 und der unmittelbar darunterliegenden ersten Zwischenlage 2 verlaufen, wird zwischen diesen beiden Lagen, die zusammen die Oberlage des Entwässerungsbandes bilden, ein erstes Strömungskanalsystem in Bandlängsrichtung geschaffen. Die oberste Querfädenlage 1 und die mit ihr durch das erste Längsfadensystem 5 verbundene erste Zwischenlage haben einen offenen Raum zur Wasserspeicherung von ca. 50 % ihres Volumens. Die integrale Durchlässigkeit beider Lagen liegt, gemessen durch den Luftdurchlaß, bei einem Unterdruck von 10 mm WS bei 1420 1/m2s. Die unter der ersten Zwischenlage 2 liegende Querfädenlage 3, die auch als zweite Zwischenlage bezeichnet werden kann, weist 14 Querfäden pro cm bei einem Durchmesser von 0,30 mm auf. Die Querfäden des untersten Querfädensystems 4 sind exakt unter denjenigen der zweiten Zwischenlage angeordnet, so daß auch die unterste Querfädenlage 4 14 Querfäden pro cm aufweist. Der Fadendurchmesser beträgt hier jedoch 0,35 mm. Die zweite Zwischenlage 3 und die unterste Querfädenlage 4, die zusammen das Stützband bilden, sind durch ein zweites Längsfädensystem 6 miteinander verbunden, das 35 Längsfäden pro cm aufweist, wobei der Fadendurchmesser 0,27 mm beträgt. Die Einbindung der Fäden der zweiten Zwischenlage und derjenigen der untersten Querfädenlage durch das zweite Längsfadensystem 6 ist, wie die Figur zeigt, in gleicher Weise ausgeführt wie bei der obersten Querfädenlage 1 und der ersten Zwischenlage 2. Auch hier bindet also das Längsfadensystem 6 verstärkt in die zweite Zwischenlage 3 ein, was zur Folge hat, daß sich auch beim Stützband das Gewebe von der zweiten Zwischenlage zur untersten Querfädenlage 4 hin öffnet. Der aus der zweiten Zwischenlage 3 und der untersten Querfädenlage 4 bestehende Gewebeteil des Entwässerungsbandes hat einen integralen, offenen Siebraum von 60 %bei einer Gesamtdurchlässigkeit von 2500 l/m2s.As the figure shows, the dewatering belt is made up of four cross-thread layers arranged one above the other, of which the uppermost cross-thread layer coming into contact with the paper web is 1, the cross-thread layer directly below this is 2, the cross-thread layer below the latter is 3 and the the bottom transverse thread layer forming the running side of the drainage belt is designated by 4. The top cross Thread layer 1 has 28 cross threads per cm with a diameter of 0.15 mm. The threads of the transverse thread layer 2 lying directly below it, which have a diameter of 0.18 mm, lie exactly below the transverse threads of the uppermost layer 1. The top transverse thread layer 1 and the underlying transverse thread layer 2, which can also be referred to as the first intermediate layer, are connected by a first longitudinal thread system 5, which consists of 72 longitudinal wires with a diameter of 0.15 mm. The course of the wires of this first longitudinal thread system 5 can be seen from the drawing. Two adjacent threads of the topmost transverse thread layer 1 are bound in each case. The longitudinal wire then runs through between the next transverse thread of the uppermost transverse thread layer 1 and the transverse thread of the layer 2 aligned with this transverse thread, then binds in a thread of the first intermediate layer 2 and then again runs over three transverse threads between the uppermost layer 1 and the first intermediate layer 2 through. Although the diameter of the transverse threads of the uppermost transverse thread layer 1 is less than the diameter of the threads of the first intermediate layer 2, the fact that the longitudinal threads are more strongly integrated into the uppermost transverse thread layer 1 reduces their openness to the first intermediate layer 2. Since approximately 50 31 of the longitudinal threads of the first longitudinal thread system 5, based on their total length, run between the uppermost transverse thread layer 1 and the immediately below first intermediate layer 2, between these two layers, which together form the upper layer of the drainage belt, a first flow channel system in the belt longitudinal direction created. The topmost transverse thread layer 1 and the first intermediate layer connected to it by the first longitudinal thread system 5 have an open space for water storage of approximately 50% of their volume. The integral permeability of both layers, measured by the air passage, is 1420 1 / m 2 s at a vacuum of 10 mm WS. The transverse thread layer 3 lying under the first intermediate layer 2, which can also be referred to as the second intermediate layer, has 14 transverse threads per cm with a diameter of 0.30 mm. The transverse threads of the lowermost transverse thread system 4 are arranged exactly below those of the second intermediate layer, so that the lowest transverse thread layer 4 also has 14 transverse threads per cm. However, the thread diameter here is 0.35 mm. The second intermediate layer 3 and the lowermost transverse thread layer 4, which together form the support band, are connected to one another by a second longitudinal thread system 6, which has 35 longitudinal threads per cm, the thread diameter being 0.27 mm. The integration of the threads of the second intermediate layer and that of the lowermost transverse thread layer by the second longitudinal thread system 6 is, as the figure shows, carried out in the same way as in the uppermost transverse thread layer 1 and the first intermediate layer 2. Here too, the longitudinal thread system 6 binds more strongly into the second intermediate layer 3, which has the consequence that the fabric opens from the second intermediate layer to the bottom transverse thread layer 4 also in the support band. The fabric part of the drainage belt consisting of the second intermediate layer 3 and the lowest transverse thread layer 4 has an integral, open screen space of 60% with a total permeability of 2500 l / m 2 s.

Alle vier Querfädenlagen 1 bis 4 sind durch ein aus Gründen der Übersichtlichkeitt nicht dargestelltes, drittes Längsfadensystem geringer Fadenzahl längs ihres Längsrandes miteinander verbunden. Dieses dritte Längsfadensystem besteht aus gezwirntem Draht, der einen Durchmesser von 0,15 mm hat.All four transverse thread layers 1 to 4 are connected to one another along their longitudinal edge by a third longitudinal thread system (not shown for reasons of clarity) with a small number of threads. This third longitudinal thread system consists of twisted wire, which has a diameter of 0.15 mm.

Das in vorstehender Weise ausgebildete Entwässerungsband hat eine Gesamtdicke von 1,6 mm. Hiervon entfallen auf die oberste Querfädenlage 1 0,25 mm, auf die unmittelbar darunterliegende erste Zwischenlage 0,30 mm, auf die zweite Zwischenlage 0,45 mm und auf die unterste Querfädenlage 0,6 mm. Die Offenheit des Entwässerungsbandes liegt weit über 50 %, und es ist nahezu inkompressibel.The drainage tape formed in the above manner has a total thickness of 1.6 mm. Of this, 0.25 mm is applied to the top transverse thread layer 1, 0.30 mm to the first intermediate layer immediately below, 0.45 mm to the second intermediate layer and 0.6 mm to the lowest transverse thread layer. The openness of the drainage belt is well over 50% and it is almost incompressible.

Alle in der vorstehenden Beschreibung erwähnten sowie auch die nur allein aus der Zeichnung entnehmbaren Merkmale sind als weitere Ausgestaltungen Bestandteile der Erfindung, auch wenn sie nicht besonders hervorgehoben und insbesondere nicht in den Ansprüchen erwähnt sind.All of the features mentioned in the above description and also the features that can only be inferred from the drawing are further refinements of the invention, even if they are not particularly emphasized and are not mentioned in the claims.

Claims (16)

1. Entwässerungsband für Pressen in der Naßpartie einer Papiermaschine, das aus einem porösen Stützband in Form eines Siebgewebes und einer feinporigen Oberlage auf der der Papierbahn zugewandten Seite des Stützbandes besteht, dadurch gekennzeichnet, daß die Oberlage (1, 2) ein formbeständige Entwässerungskanäle bildendes, monoplanes Siebgewebe ist.1. dewatering belt for presses in the wet end of a paper machine, which consists of a porous support belt in the form of a sieve fabric and a fine-pored top layer on the side of the support belt facing the paper web, characterized in that the top layer (1, 2) forms a dimensionally stable dewatering channel, monoplane mesh. 2. Entwässerungsband nach Anspruch 1, dadurch gekennzeichnet, daß die Entwässerungskanäle der Oberlage (1, 2) sich zum Stützband (3, 4) hin vergrößern.2. Drainage belt according to claim 1, characterized in that the drainage channels of the top layer (1, 2) to the support belt (3, 4) enlarge. 3. Entwässerungsband nach Anspruch 2, dadurch gekennzeichnet, daß die Durchlässigkeit des Stützbandes (3, 4) für Wasser und Luft größer ist als diejenige der Oberlage (1, 2) und daß vorzugsweise die Durchlässigkeit beider Lagen so aufeinander abgestimmt ist, daß sie einem sich zu der der Oberlage (1, 2) abgekehrten Unterseite des Stützbandes (3, 4) hin öffnenden Trichter entspricht.3. Drainage belt according to claim 2, characterized in that the permeability of the support belt (3, 4) for water and air is greater than that of the top layer (1, 2) and that preferably the permeability of the two layers is coordinated so that it is one corresponds to the funnel opening towards the underside of the support band (3, 4) facing away from the top layer (1, 2). 4. Entwässerungsband nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Anzahl der Entwässerungskanäle in der Oberlage (1, 2) größer ist als im Stützband (3, 4).4. Drainage belt according to one of claims 1 to 3, characterized in that the number of drainage channels in the top layer (1, 2) is greater than in the support belt (3, 4). 5. Entwässerungsband nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß sein offenes Volumen so gewählt ist, daß die Wasseraufnahmefähigkeit größer ist als die im Pressenspalt aufzunehmende Wassermenge.5. Drainage belt according to one of claims 1 to 4, characterized in that its open volume is selected so that the water absorption capacity is greater than the amount of water to be absorbed in the press nip. 6. Entwässerungsband nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß das Siebgewebe der Oberlage (1, 2) eine wesentlich geringere Dicke als dasjenige des Stützbandes (3, 4) hat.6. Drainage belt according to one of claims 1 to 5, characterized in that the screen fabric of the top layer (1, 2) has a substantially smaller thickness than that of the support belt (3, 4). 7. Entwässerungsband nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß das Siebgewebe der Oberlage (1, 2) eine textile Gewebekonstruktion hat und aus monofilen und/oder multifilen Fäden besteht.7. Drainage belt according to one of claims 1 to 6, characterized in that the screen fabric of the top layer (1, 2) has a textile fabric construction and consists of monofilament and / or multifilament threads. 8. Entwässerungsband nach Anspruch 7, dadurch gekennzeichnet, daß wenigstens die Fäden der einen Querfädenlage der Oberlage (1, 2) multifile Fäden sind.8. Drainage belt according to claim 7, characterized in that at least the threads of a transverse thread layer of the top layer (1, 2) are multifilament threads. 9. Entwässerungsband nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die Querfäden wenigstens in der Oberlage genau übereinander liegen und die Längsfäden des Längsfadensystems (5) von oben her bzw. unten her umschlingen.9. Drainage belt according to one of claims 1 to 8, characterized in that the transverse threads lie exactly one above the other at least in the top layer and loop around the longitudinal threads of the longitudinal thread system (5) from above and below. 10. Entwässerungsband nach Anspruch 7, dadurch gekennzeichnet, daß die oberste Maschenlage der Oberlage mit einem offenporigen Schaumstoff gefüllt ist.10. Drainage belt according to claim 7, characterized in that the top stitch layer of the top layer is filled with an open-cell foam. 11. Entwässerungsband nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß das Stützband (3, 4) und/oder die Oberlage (1, 2) mehrlagig ausgebildet sind.11. Drainage belt according to one of claims 1 to 10, characterized in that the support belt (3, 4) and / or the top layer (1, 2) are formed in several layers. 12. Entwässerungsband nach Anspruch 11, dadurch gekennzeichnet, daß die einzelnen Lagen (1, 2, 3, 4) des Stützbandes (3, 4) und/oder der Oberlage (1, 2) unterschiedliche Eigenschaften, insbesondere unterschiedliche Durchlässigkeit haben.12. Drainage belt according to claim 11, characterized in that the individual layers (1, 2, 3, 4) of the support belt (3, 4) and / or the top layer (1, 2) have different properties, in particular different permeability. 13. Entwässerungsband nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, daß das Stützband (3, 4) aus monofilen Kunststoffäden besteht.13. Drainage belt according to one of claims 1 to 12, characterized in that the support belt (3, 4) consists of monofilament plastic threads. 14. Entwässerungsband nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, daß die Oberlage (1, 2) und das Stützband (3, 4) miteinander verwoben sind.14. Drainage belt according to one of claims 1 to 13, characterized in that the top layer (1, 2) and the support belt (3, 4) are interwoven. 15. Entwässerungsband nach einem der Ansprüche 1 bis 14, dadurch gekennzeichnet, daß die Kompressibilität der Oberlage (1, 2) geringfügig höher ist als diejenige des Stützbandes (3, 4).15. Drainage belt according to one of claims 1 to 14, characterized in that the compressibility of the top layer (1, 2) is slightly higher than that of the support belt (3, 4). 16. Entwässerungsband nach einem der Ansprüche 1 bis 15, dadurch gekennzeichnet, daß es nahezu inkompressibel ist.16. Drainage belt according to one of claims 1 to 15, characterized in that it is almost incompressible.
EP85108267A 1984-07-17 1985-07-04 Drainage fabric for presses in the wet end section of a paper machine Expired - Lifetime EP0168718B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85108267T ATE53870T1 (en) 1984-07-17 1985-07-04 DEWATERING BELTS FOR PRESSES IN THE WET SECTION OF A PAPER MACHINE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843426264 DE3426264A1 (en) 1984-07-17 1984-07-17 DRAINAGE TAPE FOR PRESSES IN THE WET OF A PAPER MACHINE
DE3426264 1984-07-17

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EP0168718A2 true EP0168718A2 (en) 1986-01-22
EP0168718A3 EP0168718A3 (en) 1986-08-13
EP0168718B1 EP0168718B1 (en) 1990-05-02
EP0168718B2 EP0168718B2 (en) 1996-05-15

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US (2) US4867206A (en)
EP (1) EP0168718B2 (en)
JP (1) JPS6141394A (en)
AR (1) AR245247A1 (en)
AT (1) ATE53870T1 (en)
AU (1) AU575178B2 (en)
BR (1) BR8503111A (en)
CA (1) CA1272631A (en)
DE (2) DE3426264A1 (en)
ES (1) ES288128Y (en)
FI (1) FI80919C (en)
MX (1) MX161288A (en)
NO (1) NO166881C (en)
PT (1) PT80813B (en)

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DE3817144A1 (en) * 1988-05-19 1989-11-30 Wangner Gmbh Co Kg Hermann DOUBLE-LAYER COVERING FOR THE SHEET FORMING AREA OF A PAPER MACHINE
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DE4423436A1 (en) * 1994-07-05 1996-01-11 Franz F Kufferath Extraction of water from paper web after the fourdrinier section

Also Published As

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AU4456985A (en) 1986-01-23
FI80919B (en) 1990-04-30
MX161288A (en) 1990-08-29
ES288128Y (en) 1986-08-01
EP0168718B2 (en) 1996-05-15
PT80813A (en) 1985-08-01
PT80813B (en) 1987-09-30
CA1272631A (en) 1990-08-14
NO852839L (en) 1986-01-20
FI80919C (en) 1990-08-10
FI852774A0 (en) 1985-07-15
FI852774L (en) 1986-01-18
DE3426264A1 (en) 1986-01-30
ES288128U (en) 1986-01-01
ATE53870T1 (en) 1990-06-15
NO166881C (en) 1996-04-25
DE3426264C2 (en) 1988-04-21
NO166881B (en) 1991-06-03
JPS6141394A (en) 1986-02-27
AU575178B2 (en) 1988-07-21
AR245247A1 (en) 1993-12-30
BR8503111A (en) 1986-03-18
DE3577458D1 (en) 1990-06-07
US5056565A (en) 1991-10-15
EP0168718A3 (en) 1986-08-13
US4867206A (en) 1989-09-19
EP0168718B1 (en) 1990-05-02

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