EP1743974B1 - Press section - Google Patents
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- Publication number
- EP1743974B1 EP1743974B1 EP06114303A EP06114303A EP1743974B1 EP 1743974 B1 EP1743974 B1 EP 1743974B1 EP 06114303 A EP06114303 A EP 06114303A EP 06114303 A EP06114303 A EP 06114303A EP 1743974 B1 EP1743974 B1 EP 1743974B1
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- European Patent Office
- Prior art keywords
- press
- fibrous web
- nip
- roll
- press nip
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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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- 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
- D21F3/04—Arrangements thereof
- D21F3/045—Arrangements thereof including at least one extended press nip
Definitions
- the invention relates to a press arrangement for dewatering a paper, board, tissue or another fibrous web in a machine for producing and / or finishing the same with a first, formed by two press rolls press nip, by the side of the fibrous web on both sides each a water-absorbing dewatering tape is guided, wherein a dewatering belt is led away from the fibrous web after this press nip and a subsequent second press nip formed by two press rolls through which runs alongside the fibrous web a water-absorbing dewatering tape which on the same side of the fibrous web as that, the fibrous web after the first press nip only leading drainage tape is arranged.
- the object of the invention is therefore to improve the web guide with the lowest possible rewet.
- the transfer of the fibrous web in the transfer press nip can be done without problems.
- the transfer press roll In order to allow the removal of a dewatering belt from the fibrous web after the first press nip, the transfer press roll should be vacuumed. Through the suction, the adhesion of the fibrous web is reinforced at the then leading alone dewatering belt during the routing of the other dewatering belt.
- the surface of the fibrous web receiving element should be designed to support the acquisition relatively smooth.
- the dewatering belt of the second press nip is arranged above the fibrous web.
- the second press nip should be higher than the first press nip, preferably between 100 and 1500 mm higher.
- Both press levels of the first two press nips are inclined, wherein the angle of inclination of the press levels to the vertical should be in particular between 0 and 30 °.
- both press nips have at least one deflection-controlled press roll.
- the deflection-controlled press roll is in each case arranged above the fibrous web.
- At least one deflection-controlled press roll has a cylindrical roll shell.
- At least one deflection-controlled press roll has a flexible roll shell, which is pressed to form an extended press nip by a pressing member with concave pressing surface to the opposite press roll.
- Prolonged press gaps allow intensive and yet volume-saving dewatering of the fibrous web due to the longer residence time of the fibrous web in the press nip.
- the non-deflection-controlled, arranged under the fibrous web press roll of the first press nip is carried out sucked.
- the compactness can be further improved if the deflection controlled press rolls have a smaller diameter than the opposed press rolls.
- the distance between the two press nips should be between 1.5 and 4 m.
- a dewatering belt of the first press nip is led away from the fibrous web after the shortest possible distance of at least 60 cm after the first press nip.
- the press roller of the second press nip involved in the transfer press nip has a smooth outer surface and takes over the fibrous web directly from the dewatering belt of the first press nip.
- the fibrous web transferring dewatering belt of the first press nip nachumschlingt the receiving press roll of the second press nip after the transfer press nip with preferably up to 10 °.
- the fibrous web should be continued by the smooth press roll alone and then transferred to a transfer roll or an air-permeable belt looping around an evacuated guide roll.
- the tape is also water absorbent and the fibrous web passes through a third press nip.
- Another advantageous embodiment is obtained when the press roll of the second press nip involved in the transfer press nip is surrounded by a smooth transfer belt and takes over the fibrous web from the dewatering belt of the first press nip.
- the transferring dewatering belt with the transfer belt after the transfer press nip with up to 10 ° nachumschlingt.
- the transfer belt should lead the fibrous web after the second press nip alone and preferably passed to a, an evacuated guide roll wraps around, air-permeable belt.
- the air-permeable belt is designed as a dryer and the fibrous web leads to the dryer section.
- the fibrous web 1 is transferred from a forming wire 15 of an upstream former for sheet formation to the upper dewatering belt 2 of the first press nip of the press assembly. This is supported by an evacuated guide roll 12, which is looped around by the upper dewatering belt 2.
- the fibrous web 1 runs together with the upper 2 and a lower drainage tape 3.
- the fibrous web 1 runs together with both dewatering belts 2, 3 over as short a distance X as possible of at least 60 cm. This limitation reduces the rewetting of the fibrous web 1 from the dewatering belts 2, 3.
- the upper dewatering belt 2 wraps around an evacuated transfer press roller 11.
- This transfer press roll 11 enhances the adhesion of the fibrous web 1 to the dewatering belt 2, so that the lower dewatering belt 3 can easily be guided away from the fibrous web 1 in this area.
- the transfer press roll 11 forms, with the lower press roll 10 of a second press nip, a transfer press nip having a line force between 5 and 50 N / mm.
- the fibrous web 1 passes through the second press nip, which is formed by the lower 10 and an upper, deflection-controlled press roll 8. In this case, only the upper pressure roller 8 is wrapped by a dewatering belt 4.
- the second press nip is arranged by the distance H in the range of 100 to 1500 mm higher than the first press nip.
- press planes 22,23 of the two press nips are inclined at an angle between 0 and 30 ° to the vertical 24.
- the distance L between the press nips is in the range of 1.5 and 4m.
- the drainage belts 2,3,4,16 are designed as endless circulating and water-absorbing press felts.
- the deflection-controlled press rolls 7, 8 are smaller than the opposing press rolls 9, 10, with only one backup roll being required for the two deflection-controlled press rolls because of the same design.
- the fibrous web 1 is constantly supported by a roller or a belt up to the second press nip, which makes the arrangement suitable for high machine speeds.
- Besaugte roll usually have a perforated roll shell whose interior is connected to a vacuum source.
- the deflection-controlled press rollers 7.8 of the two press nips have a flexible roll shell, which is used to form an extended press nip of a pressing member with a concave pressing surface to the opposite cylindrical pressing roller 9,10 is pressed.
- deflection-controlled press rolls 7, 8 with a relatively dimensionally stable, cylindrical roll shell can also be used to form a normal press nip.
- the lower press roller 10 of the second press nip has a smooth outer surface, which supports the takeover of the fibrous web 1 in the transfer press nip.
- the transferring dewatering belt 2 wraps around the receiving press roll 10 even after the transfer press nip with up to 10 °. From the transfer press nip passes the fibrous web 1 of this smooth press roller 10 is supported to the press nip and then to the transfer to an air-permeable belt 6 in the form of a dryer fabric of the following dryer section. The acquisition is supported by a looped by the dryer fabric, suctioned guide roller 13.
- the fibrous web 1 is supported by dry sieves over heated drying cylinders 14.
- the fibrous web 1 according to FIG. 2 transferred from the smooth press roller 10 of the second press nip to a smooth transfer roller 17, from which the fibrous web 1 is transferred to a lower, air-permeable dewatering belt 16 of a third press nip.
- the takeover is supported by a, coiled from the lower dewatering belt 16, suctioned guide roller 21.
- the third press nip is formed by a lower, deflection-controlled press roll 19 and an upper, smooth, cylindrical press roll 18. Since the smooth press roller 18 with respect to the fibrous web 1 with respect to the smooth press roller 10th is arranged of the second press nip, results in a relatively high equilateral smoothness of the fibrous web. 1
- Both smooth pressure rollers 10,18 should be constructed the same, so that a reserve roller is sufficient.
- the deflection-controlled press rolls 7, 8 and 19 have the same structure.
- the fibrous web 1 passes through a smooth transfer roller 20 to a drying wire of the dryer section.
- the lower press roll 10 of the second press nip is looped around by a smooth transfer belt 5.
- the press roller 10 need not have a smooth cover, but like the press roller 9, it may be grooved and / or blind-drilled so that a reserve roller is sufficient for both press rollers.
- the transfer belt 5 is very well suited for guiding the fibrous web 1 through the press nip and after this until transfer.
- a dryer wire of the following dryer section takes over the fibrous web 1 from the transfer belt 5.
- the lower press roll 9 is carried out in an evacuated manner.
- the entire press arrangement is very compact and has not only a secure web guide, but also a reduced rewet.
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- Auxiliary Devices For And Details Of Packaging Control (AREA)
- Press Drives And Press Lines (AREA)
- Glass Compositions (AREA)
Abstract
Description
Die Erfindung betrifft eine Pressanordnung zur Entwässerung einer Papier-, Karton-, Tissue- oder einer anderen Faserstoffbahn in einer Maschine zur Herstellung und/oder Veredlung derselben mit einem ersten, von zwei Presswalzen gebildeten Pressspalt, durch den neben der Faserstoffbahn beidseitig je ein wasseraufnehmendes Entwässerungsband geführt ist, wobei ein Entwässerungsband nach diesem Pressspalt von der Faserstoffbahn weggeführt wird und einem folgenden zweiten, von zwei Presswalzen gebildeten Pressspalt, durch den neben der Faserstoffbahn ein wasseraufnehmendes Entwässerungsband läuft, welches auf derselben Seite der Faserstoffbahn wie das, die Faserstoffbahn nach dem ersten Pressspalt allein führende Entwässerungsband angeordnet ist.The invention relates to a press arrangement for dewatering a paper, board, tissue or another fibrous web in a machine for producing and / or finishing the same with a first, formed by two press rolls press nip, by the side of the fibrous web on both sides each a water-absorbing dewatering tape is guided, wherein a dewatering belt is led away from the fibrous web after this press nip and a subsequent second press nip formed by two press rolls through which runs alongside the fibrous web a water-absorbing dewatering tape which on the same side of the fibrous web as that, the fibrous web after the first press nip only leading drainage tape is arranged.
Derartige Pressanordnungen sind seit längerem bekannt, zB. aus der
Die Aufgabe der Erfindung ist es daher, die Bahnführung bei möglichst geringer Rückbefeuchtung zu verbessern.The object of the invention is therefore to improve the web guide with the lowest possible rewet.
Erfindungsgemäß wurde die Aufgabe durch die Merkmale des kennzeichnenden Teils des Anspruchs 1 gelöst.According to the invention the object has been solved by the features of the characterizing part of
Durch diese Anordnung wird erreicht, dass die Faserstoffbahn zwischen den Pressspalten ständig von einem Element in Form eines Bandes oder einer Walze geführt wird. Diese geschlossene Bahnführung verbessert die Bahnführung wesentlich und erlaubt sehr hohe Maschinengeschwindigkeiten.By this arrangement it is achieved that the fibrous web between the press nips is constantly guided by an element in the form of a belt or a roller. This closed web guide improves the web guide significantly and allows very high machine speeds.
Dabei kann die Übergabe der Faserstoffbahn im Übergabe-Pressspalt ohne Probleme erfolgen.The transfer of the fibrous web in the transfer press nip can be done without problems.
Dies erlaubt auch die Gestaltung einer sehr kompakten Anordnung mit relativ wenig Reservewalzen.This also allows the design of a very compact arrangement with relatively little reserve rollers.
Um die Wegführung eines Entwässerungsbandes von der Faserstoffbahn nach dem ersten Pressspalt zu ermöglichen, sollte die Übergabe-Presswalze besaugt sein. Durch die Besaugung wird die Haftung der Faserstoffbahn am anschließend allein führenden Entwässerungsband während der Wegführung des anderen Entwässerungsbandes verstärkt.In order to allow the removal of a dewatering belt from the fibrous web after the first press nip, the transfer press roll should be vacuumed. Through the suction, the adhesion of the fibrous web is reinforced at the then leading alone dewatering belt during the routing of the other dewatering belt.
Zur Unterstützung der Übergabe der Faserstoffbahn genügt eine Linienkraft im Übergabe-Pressspalt zwischen 5 und 50 N/mm. Dabei sollte die Oberfläche des, die Faserstoffbahn übernehmenden Elementes zur Unterstützung der Übernahme relativ glatt ausgebildet sein.To support the transfer of the fibrous web a line force in the transfer press nip between 5 and 50 N / mm is sufficient. In this case, the surface of the fibrous web receiving element should be designed to support the acquisition relatively smooth.
Im Interesse einer einfachen Bahnführung ist es vorteilhaft, wenn das Entwässerungsband des zweiten Pressspaltes über der Faserstoffbahn angeordnet ist.In the interest of a simple web guide, it is advantageous if the dewatering belt of the second press nip is arranged above the fibrous web.
Aus gleichem Grund sollte auch der zweite Pressspalt höher als der erste Pressspalt, vorzugsweise zwischen 100 und 1500 mm höher liegen.For the same reason, the second press nip should be higher than the first press nip, preferably between 100 and 1500 mm higher.
Beide Pressebenen der beiden ersten Pressspalte sind geneigt, wobei der Neigungswinkel der Pressebenen zur Senkrechten insbesondere zwischen 0 und 30° liegen sollte.Both press levels of the first two press nips are inclined, wherein the angle of inclination of the press levels to the vertical should be in particular between 0 and 30 °.
Zur Erhöhung der Pressdrücke im Pressspalt und zur Beeinflussung der Entwässerung über die Bahnbreite besitzen beide Pressspalte wenigstens eine durchbiegungsgesteuerte Presswalze .To increase the compression pressures in the press nip and to influence the dewatering across the web width, both press nips have at least one deflection-controlled press roll.
Die durchbiegungsgesteuerte Presswalze ist jeweils über der Faserstoffbahn angeordnet .The deflection-controlled press roll is in each case arranged above the fibrous web.
Entsprechend den Anforderungen und dem Feuchtegehalt sowie dem Flächengewicht der Faserstoffbahn kann es vorteilhaft sein, wenn zumindest eine durchbiegungsgesteuerte Presswalze einen zylindrischen Walzenmantel aufweist.According to the requirements and the moisture content and the basis weight of the fibrous web, it may be advantageous if at least one deflection-controlled press roll has a cylindrical roll shell.
Es kann aber auch von Vorteil sein, wenn wenigstens eine durchbiegungsgesteuerte Presswalze einen flexiblen Walzenmantel besitzt, der zur Bildung eines verlängerten Pressspaltes von einem Anpresselement mit konkaver Pressfläche zur gegenüberliegenden Presswalze gedrückt wird.But it may also be advantageous if at least one deflection-controlled press roll has a flexible roll shell, which is pressed to form an extended press nip by a pressing member with concave pressing surface to the opposite press roll.
Verlängerte Pressspalte erlauben wegen der längeren Verweilzeit der Faserstoffbahn im Pressspalt eine intensive und dennoch volumenschonende Entwässerung der Faserstoffbahn.Prolonged press gaps allow intensive and yet volume-saving dewatering of the fibrous web due to the longer residence time of the fibrous web in the press nip.
Wegen des hohen Wasseranfalls im ersten Pressspalt kann es vorteilhaft sein, wenn die nicht-durchbiegungsgesteuerte, unter der Faserstoffbahn angeordnete Presswalze des ersten Pressspaltes besaugt ausgeführt ist.Because of the high water attack in the first press nip, it may be advantageous if the non-deflection-controlled, arranged under the fibrous web press roll of the first press nip is carried out sucked.
Die Kompaktheit kann des Weiteren verbessert werden, wenn die durchbiegungsgesteuerten Presswalzen einen kleineren Durchmesser als die gegenüberliegenden Presswalzen besitzen.The compactness can be further improved if the deflection controlled press rolls have a smaller diameter than the opposed press rolls.
Um die Rückbefeuchtungsstrecken einzugrenzen und eine möglichst kompakte Anordnung zu erreichen, sollte der Abstand zwischen den beiden Pressspalten zwischen 1,5 und 4 m liegen.In order to limit rewetting distances and to achieve the most compact possible arrangement, the distance between the two press nips should be between 1.5 and 4 m.
Zur Minimierung der Rückbefeuchtung unter Beibehaltung einer ausreichenden Führung der Faserstoffbahn wird ein Entwässerungsband des ersten Pressspaltes nach einer möglichst kurzen Strecke von jedoch mindestens 60 cm nach dem ersten Pressspalt von der Faserstoffbahn weggeführt.To minimize the rewet while maintaining sufficient guidance of the fibrous web, a dewatering belt of the first press nip is led away from the fibrous web after the shortest possible distance of at least 60 cm after the first press nip.
Im Interesse einer sicheren Bahnübergabe kann es vorteilhaft sein, wenn die am Übergabe-Pressspalt beteiligte Presswalze des zweiten Pressspaltes eine glatte Mantelfläche hat und die Faserstoffbahn direkt vom Entwässerungsband des ersten Pressspaltes übernimmt.In the interest of a safe web transfer, it may be advantageous if the press roller of the second press nip involved in the transfer press nip has a smooth outer surface and takes over the fibrous web directly from the dewatering belt of the first press nip.
Für die sichere Übergabe kann es außerdem von Vorteil sein, wenn das die Faserstoffbahn übergebende Entwässerungsband des ersten Pressspaltes die übernehmende Presswalze des zweiten Pressspaltes nach dem Übergabe-Pressspalt mit vorzugsweise bis zu 10° nachumschlingt.For the safe transfer, it can also be advantageous if the fibrous web transferring dewatering belt of the first press nip nachumschlingt the receiving press roll of the second press nip after the transfer press nip with preferably up to 10 °.
Nach dem zweiten Pressspalt sollte die Faserstoffbahn von der glatten Presswalze allein weitergeführt und anschließend an eine Übergabewalze oder ein, eine besaugte Leitwalze umschlingendes, luftdurchlässiges Band übergeben werden.After the second press nip, the fibrous web should be continued by the smooth press roll alone and then transferred to a transfer roll or an air-permeable belt looping around an evacuated guide roll.
Es ist aber ebenso möglich, dass das Band auch wasseraufnehmend ist und die Faserstoffbahn durch einen dritten Pressspalt führt.But it is also possible that the tape is also water absorbent and the fibrous web passes through a third press nip.
Eine andere vorteilhafte Ausführung ergibt sich, wenn die am Übergabe-Pressspalt beteiligte Presswalze des zweiten Pressspaltes von einem glatten Transferband umschlungen ist und die Faserstoffbahn vom Entwässerungsband des ersten Pressspaltes übernimmt. Um die Übergabe zu unterstützen kann es von Vorteil sein, wenn das übergebende Entwässerungsband die Presswalze mit dem Transferband nach dem Übergabe-Pressspalt noch mit bis zu 10° nachumschlingt.Another advantageous embodiment is obtained when the press roll of the second press nip involved in the transfer press nip is surrounded by a smooth transfer belt and takes over the fibrous web from the dewatering belt of the first press nip. To assist the transfer, it may be advantageous if the transferring dewatering belt with the transfer belt after the transfer press nip with up to 10 ° nachumschlingt.
Auch hier sollte das Transferband die Faserstoffbahn nach dem zweiten Pressspalt allein führen und vorzugsweise an ein, eine besaugte Leitwalze umschlingendes, luftdurchlässiges Band übergeben.Again, the transfer belt should lead the fibrous web after the second press nip alone and preferably passed to a, an evacuated guide roll wraps around, air-permeable belt.
Sofern dem zweiten Pressspalt kein weiterer Press- oder Glättspalt folgt, so ist es in beiden Fällen von Vorteil, wenn das luftdurchlässige Band als Trockensieb ausgeführt ist und die Faserstoffbahn zur Trockenpartie führt.If the second press nip no further pressing or smoothing gap follows, it is in both cases advantageous if the air-permeable belt is designed as a dryer and the fibrous web leads to the dryer section.
Nachfolgend soll die Erfindung an einem Ausführungsbeispiel näher erläutert werden. In der beigefügten Zeichnung zeigt:
- Figur 1:
- einen schematischen Querschnitt durch eine Pressanordnung ohne Transferband 5,
- Figur 2:
- eine Pressanordnung mit drittem Pressspalt und
- Figur 3:
- eine Pressanordnung mit Transferband 5.
- FIG. 1:
- a schematic cross section through a press arrangement without
transfer belt 5, - FIG. 2:
- a press arrangement with third press nip and
- FIG. 3:
- a press arrangement with
transfer belt 5.
Bei allen drei Beispielen wird die Faserstoffbahn 1 von einem Formersieb 15 eines vorgelagerten Formers zur Blattbildung an das obere Entwässerungsband 2 des ersten Pressspaltes der Pressanordnung übergeben. Dies wird von einer vom oberen Entwässerungsband 2 umschlungenen, besaugten Leitwalze 12 unterstützt.In all three examples, the
Durch den, von einer oberen, durchbiegungsgesteuerten Presswalze 7 und einer unteren Presswalze 9 gebildeten, ersten Pressspalt läuft die Faserstoffbahn 1 gemeinsam mit dem oberen 2 und einem unteren Entwässerungsband 3.By means of the first press nip formed by an upper, deflection-controlled
Nach dem ersten Pressspalt läuft die Faserstoffbahn 1 gemeinsam mit beiden Entwässerungsbändern 2,3 über eine möglichst kurze Strecke X von jedoch mindestens 60 cm. Diese Begrenzung verringert die Rückbefeuchtung der Faserstoffbahn 1 von den Entwässerungsbändern 2,3 her.After the first press nip, the
Anschließend umschlingt das obere Entwässerungsband 2 eine besaugte Übergabe-Presswalze 11.Subsequently, the
Der Unterdruck dieser Übergabe-Presswalze 11 verstärkt die Haftung der Faserstoffbahn 1 am Entwässerungsband 2, so dass das untere Entwässerungsband 3 in diesem Bereich problemlos von der Faserstoffbahn 1 wegegeführt werden kann.The negative pressure of this
Die Übergabe-Presswalze 11 bildet mit der unteren Presswalze 10 eines zweiten Pressspaltes einen Übergabe-Pressspalt mit einer Linienkraft zwischen 5 und 50 N/mm.The
Nach dem Übergabe-Pressspalt gelangt die Faserstoffbahn 1 durch den zweiten Pressspalt, der von der unteren 10 und einer oberen, durchbiegungsgesteuerten Presswalze 8 gebildet wird. Dabei wird nur die obere Presswalze 8 von einem Entwässerungsband 4 umschlungen.After the transfer press nip, the
Um die Bahnführung zu vereinfachen ist der zweite Pressspalt um die Strecke H im Bereich von 100 bis 1500 mm höher als der erste Pressspalt angeordnet.In order to simplify the web guide, the second press nip is arranged by the distance H in the range of 100 to 1500 mm higher than the first press nip.
Außerdem sind die Pressebenen 22,23 der beiden Pressspalte um einen Winkel zwischen 0 und 30° zur Senkrechten 24 geneigt.In addition, the
Im Interesse einer großen Kompaktheit liegt der Abstand L zwischen den Pressspalten im Bereich von 1,5 und 4m.In the interest of a large compactness, the distance L between the press nips is in the range of 1.5 and 4m.
Die Entwässerungsbänder 2,3,4,16 sind als endlos umlaufende und wasseraufnehmende Pressfilze ausgeführt.The
Die durchbiegungsgesteuerten Presswalzen 7,8 sind kleiner als die gegenüberliegenden Presswalzen 9,10, wobei für die beiden durchbiegungsgesteuerten Presswalze wegen der gleichen Ausführung nur eine Reservewalze erforderlich ist.The deflection-controlled
Die Faserstoffbahn 1 wird bis zum zweiten Pressspalt ständig von einer Walze oder einem Band gestützt, was die Anordnung für hohe Maschinengeschwindigkeiten geeignet macht.The
Besaugte Walze haben meist einen perforierten Walzenmantel, dessen Innenraum mit einer Unterdruckquelle verbunden ist.Besaugte roll usually have a perforated roll shell whose interior is connected to a vacuum source.
Die durchbiegungsgesteuerten Presswalzen 7,8 der beiden Pressspalte besitzen einen flexiblen Walzenmantel, der zur Bildung eines verlängerten Pressspaltes von einem Anpresselement mit konkaver Pressfläche zur gegenüberliegenden, zylindrischen Presswalze 9,10 gedrückt wird.The deflection-controlled press rollers 7.8 of the two press nips have a flexible roll shell, which is used to form an extended press nip of a pressing member with a concave pressing surface to the opposite cylindrical
Verlängerte Pressspalte erlauben eine schonende Entwässerung.Prolonged press gaps allow gentle drainage.
Es sind jedoch auch durchbiegungsgesteuerte Presswalzen 7,8 mit relativ formstabilen, zylindrischen Walzenmantel zur Bildung eines normalen Pressspaltes einsetzbar.However, deflection-controlled press rolls 7, 8 with a relatively dimensionally stable, cylindrical roll shell can also be used to form a normal press nip.
Bei der in
In der Trockenpartie wird die Faserstoffbahn 1 von Trockensieben gestützt über beheizte Trockenzylinder 14 geführt.In the dryer section, the
Im Unterschied hierzu wird die Faserstoffbahn 1 gemäß
Der dritte Pressspalt wird von einer unteren, durchbiegungsgesteuerten Presswalze 19 und einer oberen glatten, zylindrischen Presswalze 18 gebildet. Da die glatte Presswalze 18 bezüglich der Faserstoffbahn 1 gegenüber der glatten Presswalze 10 des zweiten Pressspaltes angeordnet ist, ergibt sich eine relativ hohe gleichseitige Glätte der Faserstoffbahn 1.The third press nip is formed by a lower, deflection-controlled
Beide glatte Presswalzen 10,18 sollten gleich aufgebaut sein, so dass eine Reservewalze genügt.Both
Aus dem gleichen Grund sind auch die durchbiegungsgesteuerten Presswalzen 7,8 und 19 gleich aufgebaut.For the same reason, the deflection-controlled press rolls 7, 8 and 19 have the same structure.
Von der glatten Presswalze 18 gelangt die Faserstoffbahn 1 über eine glatte Übergabewalze 20 an ein Trockensieb der Trockenpartie.From the smooth
Bei der in
In diesem Fall muss die Presswalze 10 keinen glatten Bezug aufweisen, sondern kann wie die Presswalze 9 gerillt und/oder blindgebohrt sein, so dass eine Reservewalze für beide Presswalzen genügt.In this case, the
Wegen seiner Glätte eignet sich das Transferband 5 sehr gut zur Führung der Faserstoffbahn 1 durch den Pressspalt und nach diesem bis zur Übergabe.Because of its smoothness, the
Nach dem zweiten Pressspalt übernimmt ein Trockensieb der folgenden Trockenpartie die Faserstoffbahn 1 vom Transferband 5.After the second press nip, a dryer wire of the following dryer section takes over the
Außerdem wird hier alternativ wegen des erhöhten Wasseranfalls im ersten Pressspalt die untere Presswalze 9 besaugt ausgeführt.In addition, here, due to the increased water attack in the first press nip, the
Die gesamte Pressanordnung ist sehr kompakt und weist nicht nur eine sichere Bahnführung, sondern auch eine verminderte Rückbefeuchtung auf.The entire press arrangement is very compact and has not only a secure web guide, but also a reduced rewet.
Claims (18)
- Press arrangement for dewatering a paper, board, tissue or other fibrous web (1) in a machine for producing and/or finishing the same, having a first press nip formed by two press rolls (7, 9), through which, in addition to the fibrous web (1), a water-absorbing dewatering belt (2, 3) is led on both sides in each case, one dewatering belt (3) being led away from the fibrous web (1) after this press nip and running through a following, second press nip formed by two press rolls (8, 10), through which, in addition to the fibrous web (1), there runs a water-absorbing dewatering belt (4), which is arranged on the same side of the fibrous web (1) as the dewatering belt (2) carrying the fibrous web (1) on its own after the first press nip, the dewatering belt (2) carrying the fibrous web (1) on its own after the first press nip wrapping around a transfer press roll (11) which, together with the press roll (10) of the second press nip around which a dewatering belt (4) does not wrap, forms a transfer press nip, both press nips having at least one controlled-deflection press roll (7, 8), which is in each case arranged above the fibrous web (1),
characterized in that
both pressing planes (22, 23) of the two first press nips are inclined, and the lower dewatering belt (3) of the first press nip is led away from the fibrous web (1) after a distance (X) that is as short as possible but of at least 60 cm after the first press nip. - Press arrangement according to Claim 1, characterized in that the transfer press nip (11) is evacuated.
- Press arrangement according to Claim 1 or 2, characterized in that the line force in the transfer press nip lies between 5 and 50 N/mm.
- Press arrangement according to one of the preceding claims, characterized in that the dewatering belt (4) of the second press nip is arranged above the fibrous web (1).
- Press arrangement according to one of the preceding claims, characterized in that the second press nip is higher than the first press nip, preferably between 100 and 1500 mm higher.
- Press arrangement according to one of the preceding claims, characterized in that the angle of inclination of the pressing planes (22, 23) with respect to the vertical (24) lies between 0 and 30°.
- Press arrangement according to one of the preceding claims, characterized in that at least one controlled-deflection press roll (7, 8) has a cylindrical roll shell.
- Press arrangement according to one of the preceding claims, characterized in that at least one controlled-deflection press roll (7, 8) has a flexible roll shell which, in order to form an extended press nip, is pressed towards the opposite press roll (9, 10) by a pressure element having a concave pressing surface.
- Press arrangement according to one of the preceding claims, characterized in that the non-controlled-deflection press roll (9) of the first press nip, arranged under the fibrous web (1), is designed to be evacuated.
- Press arrangement according to one of the preceding claims, characterized in that the controlled-deflection press rolls (7, 8) have a smaller diameter than the opposite press rolls (9, 10).
- Press arrangement according to one of the preceding claims, characterized in that the distance between the two press nips is between 1.5 and 4 m.
- Press arrangement according to one of the preceding claims, characterized in that the press roll (10) of the second press nip, involved in the transfer press nip, has a smooth circumferential surface and picks up the fibrous web (1) directly from the dewatering belt (2) of the first press nip.
- Press arrangement according to Claim 12, characterized in that after the second press nip, the fibrous web is carried onwards by the smooth press roll (10) on its own and is transferred to a transfer roll (17) or an air-permeable belt (6, 16) that wraps around an evacuated guide roll (13, 21).
- Press arrangement according to Claim 13, characterized in that the belt (16) is preferably water-absorbent and leads the fibrous web (1) through a third press nip.
- Press arrangement according to one of Claims 1 to 11, characterized in that the press roll (10) of the second press nip, involved in the transfer press nip, has a smooth transfer belt (5) wrapped around it and picks up the fibrous web (1) from the dewatering belt (2) of the first press nip.
- Press arrangement according to Claim 15, characterized in that, after the second press nip, the transfer belt (5) carries the fibrous web (1) on its own and preferably transfers it to an air-permeable belt (6, 16) that wraps around an evacuated guide roll (13, 21).
- Press arrangement according to Claim 13 or 16, characterized in that the belt (6) is designed as a dryer fabric and leads the fibrous web (1) to the drying section.
- Press arrangement according to one of the preceding claims, characterized in that the dewatering belt (2) transferring the fibrous web (1) after the first press nip wraps around the press roll (10) again by up to 10° after the transfer press nip.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102005033529A DE102005033529A1 (en) | 2005-07-14 | 2005-07-14 | Press arrangement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1743974A1 EP1743974A1 (en) | 2007-01-17 |
| EP1743974B1 true EP1743974B1 (en) | 2009-09-09 |
Family
ID=37057275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP06114303A Not-in-force EP1743974B1 (en) | 2005-07-14 | 2006-05-22 | Press section |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1743974B1 (en) |
| AT (1) | ATE442479T1 (en) |
| DE (2) | DE102005033529A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102015223660A1 (en) * | 2015-11-30 | 2017-06-01 | Voith Patent Gmbh | DEVICE AND METHOD FOR PRODUCING A FIBROUS WEB |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5876565A (en) * | 1994-10-06 | 1999-03-02 | Valmet Corporation | Press section with an equalizing nip for compensating for elongation of a paper web |
| DE19543111C2 (en) * | 1995-11-18 | 2001-01-25 | Voith Sulzer Papiermasch Gmbh | Press section of a paper machine with closed web guidance and method for dewatering a paper web |
| US5891308A (en) * | 1996-02-02 | 1999-04-06 | Beloit Technologies, Inc. | Method of pressing a paper web of tropical hardwood fibers |
| DE19654325A1 (en) * | 1996-12-24 | 1998-06-25 | Voith Sulzer Papiermasch Gmbh | Press section of a paper-making machine |
| DE20216498U1 (en) * | 2002-10-25 | 2003-03-27 | Metso Paper Karlstad Ab, Karlstad | Machine for making a sheet of paper or cardboard |
-
2005
- 2005-07-14 DE DE102005033529A patent/DE102005033529A1/en not_active Withdrawn
-
2006
- 2006-05-22 EP EP06114303A patent/EP1743974B1/en not_active Not-in-force
- 2006-05-22 AT AT06114303T patent/ATE442479T1/en active
- 2006-05-22 DE DE502006004777T patent/DE502006004777D1/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| ATE442479T1 (en) | 2009-09-15 |
| DE502006004777D1 (en) | 2009-10-22 |
| DE102005033529A1 (en) | 2007-01-18 |
| EP1743974A1 (en) | 2007-01-17 |
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