EP1316641B1 - Press section - Google Patents
Press sectionInfo
- Publication number
- EP1316641B1 EP1316641B1 EP02016712A EP02016712A EP1316641B1 EP 1316641 B1 EP1316641 B1 EP 1316641B1 EP 02016712 A EP02016712 A EP 02016712A EP 02016712 A EP02016712 A EP 02016712A EP 1316641 B1 EP1316641 B1 EP 1316641B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- press
- fibrous material
- material web
- transfer belt
- press nip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- 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
-
- 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
Definitions
- the invention relates to a press section for dewatering a paper, board, tissue or another fibrous web with at least three press nips, according to the preamble of claim 1.
- Such a press section is known, for example, from document US Pat. No. 5,762,761.
- Presses with three press nips are known, the two first being executed mostly extended in the interest of a high dewatering performance and double felted and the last press nip is simply felted.
- the smoothness arises essentially by the contact of the fibrous web with a smooth press roll in the last press nip.
- the object of the invention is therefore to ensure a low two-sidedness in terms of roughness in the press section in addition to a high dewatering performance.
- the object has been solved by the features of the characterizing part of claim 1. It is advantageous if the transfer belt runs only through a press nip and the fibrous web from the press nip with the transfer belt to a following Pressing gap passes, wherein this following press nip is formed by two press rolls, one of which, has a smooth surface and comes into contact with the fibrous web.
- the three press nips ensure high drainage performance.
- the smoothness on both sides of the fibrous web is increased to about the same extent.
- the press nip should be made longer with the transfer belt and preferably be formed by a shoe roll and a cylindrical counter roll.
- the press nip should be preceded by a press nip with the transfer belt and this upstream press nip preferably forms the first press nip of the press section.
- the upstream press nip can be made longer and preferably formed by a shoe roll and a cylindrical counter roll or else be formed to minimize the expense of two cylindrical press rolls.
- the following press nip should be the last press nip of the press section. It is sufficient if the following press nip of two cylindrical press rolls is formed. For the smoothing result and in the interest of preheating the fibrous web for a subsequent drying process, it is advantageous if at least one press roll of the following press nip is heated, this heated press roll preferably comes into contact with the fibrous web.
- the fibrous web should at least from the first to the last press nip of the press section of at least one band in the form of a dewatering belt, transfer tape or the like. be supported.
- the press section For drying the fibrous web, the press section generally follows a drying section with preferably several drying groups for drying the fibrous web.
- at least the first dryer section of the dryer section should be formed by a series of drying cylinders, between which guide rollers are arranged, wherein the fibrous web wraps around the drying cylinders and guide rollers in a meandering manner supported by a drying wire. This allows for simplification or conversions that the heated press roll of the following press nip is formed by a drying cylinder.
- a suction device is assigned to the drying wire, which reinforces the adhesion of the fibrous web to the drying wire.
- a suction zone with increased negative pressure should be present in this area. In conjunction with the relatively high dry contents in the press section and a possible closed guidance of the fibrous web, this allows very high web speeds.
- a particularly simple structure results when the transfer belt runs over the fibrous web.
- the dewatering belt running under the transfer belt can transfer the fibrous web directly to the dewatering belt of the following press nip extending above the fibrous web.
- This in turn allows the smooth press roller of the following press nip arranged below the fibrous web to transfer the fibrous web preferably directly to the dryer fabric of the first dryer group running above the fibrous web.
- Drying groups with dryer fabric running above the fibrous web offer considerable advantages in case of possible demolition or during transfer, since the fibrous web can be discharged into the machine cellar without difficulty. It can with advantage, the transfer of the fibrous web to the dryer fabric of a looped by the dryer fabric suction device in the form of a suction roll, a suction box or the like. get supported.
- the fibrous web is transferred from the transfer belt to another, preferably air-permeable transfer belt and from there to the running below the fibrous web dewatering belt of the following press nip.
- the drainage tapes should be designed as press felts.
- the smooth transfer belt should be impermeable to air and water.
- the smooth transfer belt runs only through the last press nip and the smooth press roll is present in the second press nip and comes into contact with the fibrous web.
- the press section has three press nips, which are formed by two rotating press rolls 7, 8, 9, 10, 11, 12 pressed against one another, wherein at least one dewatering belt 2, 3, 4, 5 is passed through each press nip in addition to the fibrous web 1.
- the endless circulating dewatering belts 2, 3, 4, 5 serve to receive and transport the water pressed out of the fibrous web 1 in the press nip and are designed here as air-permeable and water-permeable press felts.
- the first two press nips of the press section are designed to be extended and are each formed by a shoe roller 9,11 located above the fibrous web 1 and a lower cylindrical counter roller 10,12.
- the extended press nip allows intensive and yet gentle dewatering of the fibrous web 1.
- the shoe rolls 9, 11 have a flexible roll shell, which is guided in the region of the press nip via a contact element with a concave press surface.
- a dewatering belt 2, 3 is guided through this on both sides of the fibrous web 1.
- the dewatering belt 2 running above the fibrous web 1 takes over the fibrous web 1 from a forming wire 18 of a former upstream of the press section for sheet formation.
- the lower dewatering belt 3 of the first press nip transfers the fibrous web 1 after the press nip to a smooth, endlessly circulating and air- and water-impermeable transfer belt 6 of the second press nip, which extends over the fibrous web 1.
- the fibrous web 1 then passes through together with the transfer belt 6 and the running below Dewatering belt 4 the second press nip. Because of the pre-dewatering in the first, upstream press nip a dewatering belt 4 is sufficient in the second press nip for receiving the squeezed water.
- the upper side of the fibrous web 1 is smoothed.
- the lower dewatering belt 4 of the second press nip transfers the fibrous web 1 to a dewatering belt 5 running over the fibrous web 1 of the following, last press nip of the press section.
- This third press nip is formed by two cylindrical press rolls 7, 8, one of which is deflection-controlled.
- the fibrous web 1 comes before, in and after the last press nip with the lower press roller 8 in direct contact.
- the lower press roller 8 therefore has a smooth and closed surface. This succeeds in significantly reducing the two-sidedness of the smoothness.
- the lower pressure roller 8 is still heated, so that already a predrying of the fibrous web 1 takes place.
- This heating also promotes by the formation of a vapor cushion, the detachment and transfer of the fibrous web 1 to a dryer 15 of the first dryer group of the following dryer section for drying the fibrous web 1.
- the dryer wire 15 is guided directly to the lower press roller 8, wherein the decrease of the fibrous web 1 is supported by a suction device 16 looped around by the drying wire 15 in the form of a known suction box.
- At least the first dryer group is formed by a series of drying cylinders 13, between which guide rollers 14 are arranged, wherein the fibrous web 1, meandering from the dryer wire 15, wraps around the drying cylinders 13 and guide rollers 14. In this case, the fibrous web 1 comes to dry directly in contact with the heated drying cylinders 13. In the web running direction 17 can then follow similar or other dry groups of the dryer section.
- the acquisition of the fibrous web 1 by an air-permeable Dewatering belt 2.5 are supported by means of a suctioned by the respective dewatering belt 2.5 suctioned roller.
Landscapes
- Paper (AREA)
- Resistance Heating (AREA)
Abstract
Description
Die Erfindung betrifft eine Pressenpartie zur Entwässerung einer Papier-, Karton-, Tissue- oder einer anderen Faserstoffbahn mit zumindest drei Pressspalten, nach dem Oberbegriff des Anspruchs 1.The invention relates to a press section for dewatering a paper, board, tissue or another fibrous web with at least three press nips, according to the preamble of claim 1.
Eine solche Pressenpartie ist beispielsweise aus dem Dokument US-A-5 762 761 bekannt.Such a press section is known, for example, from document US Pat. No. 5,762,761.
Pressen mit drei Pressspalten sind bekannt, wobei die beiden ersten im Interesse einer hohen Entwässerungsleistung meist verlängert ausgeführt und doppelt befilzt sind und der letzte Pressspalt einfach befilzt ist. Neben einer guten und schonenden Entwässerung ergibt sich auch eine hohe Glätte. Die Glätte entsteht im wesentlichen durch den Kontakt der Faserstoffbahn mit einer glatten Presswalze im letzten Pressspalt. Jedoch ergibt sich hierdurch hinsichtlich der Glätte eine ausgeprägte Zweiseitigkeit, die in der folgenden Glätteinrichtung der Papiermaschine nur unzureichend oder zu Lasten der Beeinflussbarkeit anderer Eigenschaften der Faserstoffbahn, wie beispielsweise der Schwarzsatinage ausgeglichen werden kann.Presses with three press nips are known, the two first being executed mostly extended in the interest of a high dewatering performance and double felted and the last press nip is simply felted. In addition to a good and gentle drainage also results in a high smoothness. The smoothness arises essentially by the contact of the fibrous web with a smooth press roll in the last press nip. However, this results in the smoothness of a pronounced two-sidedness, which can be compensated in the following smoothness of the paper machine only insufficient or at the expense of influencing other properties of the fibrous web, such as the black satin.
Die Aufgabe der Erfindung ist es daher bei der Pressenpartie neben einer hohen Entwässerungsleistung auch eine geringe Zweiseitigkeit hinsichtlich der Rauhigkeit zu gewährleisten.The object of the invention is therefore to ensure a low two-sidedness in terms of roughness in the press section in addition to a high dewatering performance.
Erfindungsgemäß wurde die Aufgabe durch die Merkmale des Kennzeichnenden Teils des Anspruchs 1 gelöst. Vorteilhaft ist es dabei, wenn das Transferband nur durch einen Pressspalt läuft und die Faserstoffbahn vom Pressspalt mit dem Transferband zu einem folgenden Pressspalt gelangt, wobei dieser folgende Pressspalt von zwei Presswalzen gebildet wird, von denen eine, eine glatte Oberfläche aufweist und mit der Faserstoffbahn in Kontakt kommt.According to the invention the object has been solved by the features of the characterizing part of claim 1. It is advantageous if the transfer belt runs only through a press nip and the fibrous web from the press nip with the transfer belt to a following Pressing gap passes, wherein this following press nip is formed by two press rolls, one of which, has a smooth surface and comes into contact with the fibrous web.
Die drei Pressspalte gewährleisten eine hohe Entwässerungsleistung. Darüber hinaus wird durch den Kontakt der Faserstoffbahn mit einem glatten Transferband in einem Pressspalt und den Kontakt der gegenüberliegenden Seite der Faserstoffbahn mit der glatten Presswalze im vorzugsweise folgenden Pressspalt die Glätte auf beiden Seiten der Faserstoffbahn in etwa demselben Umfang erhöht.The three press nips ensure high drainage performance. In addition, by the contact of the fibrous web with a smooth transfer belt in a press nip and the contact of the opposite side of the fibrous web with the smooth press roll in the preferably following press nip, the smoothness on both sides of the fibrous web is increased to about the same extent.
Im Interesse einer schonenden und dennoch intensiven Entwässerung sollte der Pressspalt mit dem Transferband verlängert ausgeführt sein und vorzugsweise von einer Schuhwalze und einer zylindrischen Gegenwalze gebildet werden. Um die Glättebildung an das Ende der Pressenpartie zu verlagern, sollte dem Pressspalt mit dem Transferband ein Pressspalt vorgelagert sein und dieser vorgelagerte Pressspalt vorzugsweise den ersten Pressspalt der Pressenpartie bilden.In the interests of gentle, yet intensive dewatering, the press nip should be made longer with the transfer belt and preferably be formed by a shoe roll and a cylindrical counter roll. In order to shift the smoothness formation to the end of the press section, the press nip should be preceded by a press nip with the transfer belt and this upstream press nip preferably forms the first press nip of the press section.
Damit erfolgt der wesentliche Teil der Entwässerung in den beiden ersten Pressspalten, wobei wegen des großen Wasseranfalls durch den vorgelagerten Pressspalt beidseitig der Faserstoffbahn je ein Entwässerungsband geführt werden sollte.Thus, the major part of the drainage takes place in the first two press nips, which was due to the large water attack by the upstream press nip on both sides of the fibrous web per a dewatering belt should be performed.
Je nach Art und Feuchtegehalt der Faserstoffbahn sowie den gestellten Anforderungen kann der vorgelagerte Pressspalt verlängert ausgeführt sein und vorzugsweise von einer Schuhwalze und einer zylindrischen Gegenwalze gebildet werden oder aber zur Minimierung des Aufwandes von zwei zylindrischen Presswalzen gebildet werden.Depending on the nature and moisture content of the fibrous web and the requirements imposed, the upstream press nip can be made longer and preferably formed by a shoe roll and a cylindrical counter roll or else be formed to minimize the expense of two cylindrical press rolls.
Um eine Beeinträchtigung der erreichten Glätte der Faserstoffbahn in der Pressenpartie zu verhindern, sollte der folgende Pressspalt der letzte Pressspalt der Pressenpartie sein. Dabei ist es ausreichend, wenn der folgende Pressspalt von zwei zylindrischen Presswalzen gebildet wird. Für das Glättergebnis sowie im Interesse einer Vorwärmung der Faserstoffbahn für einen sich anschließenden Trocknungsprozess ist es vorteilhaft, wenn zumindest eine Presswalze des folgenden Pressspaltes beheizt ist, wobei diese beheizte Presswalze vorzugsweise mit der Faserstoffbahn in Kontakt kommt.In order to prevent an impairment of the achieved smoothness of the fibrous web in the press section, the following press nip should be the last press nip of the press section. It is sufficient if the following press nip of two cylindrical press rolls is formed. For the smoothing result and in the interest of preheating the fibrous web for a subsequent drying process, it is advantageous if at least one press roll of the following press nip is heated, this heated press roll preferably comes into contact with the fibrous web.
Insbesondere bei hohen Bahngeschwindigkeiten und/oder geringen Flächengewichten der Faserstoffbahn bereitet die sichere Führung der Faserstoffbahn und die Vermeidung von Ein- oder Abrissen erhebliche Probleme. Daher sollte die Faserstoffbahn zumindest vom ersten bis zum letzten Pressspalt der Pressenpartie von wenigstens einem Band in Form eines Entwässerungsbandes, Transferbandes o.ä. gestützt werden.Particularly at high web speeds and / or low basis weights of the fibrous web, the safe guidance of the fibrous web and the prevention of tearing or tearing down pose considerable problems. Therefore, the fibrous web should at least from the first to the last press nip of the press section of at least one band in the form of a dewatering belt, transfer tape or the like. be supported.
Zur Trocknung der Faserstoffbahn folgt der Pressenpartie im allgemeinen eine Trockenpartie mit vorzugsweise mehreren Trockengruppen zur Trocknung der Faserstoffbahn. Im Interesse einer geringen Abrissgefahr sollte hierbei wenigstens die erste Trockengruppe der Trockenpartie von einer Reihe von Trockenzylindern gebildet werden, zwischen denen Leitwalzen angeordnet sind, wobei die Faserstoffbahn mäanderförmig von einem Trockensieb gestützt die Trockenzylinder und Leitwalzen umschlingt. Dies erlaubt es zur Vereinfachung oder bei Umbauten, dass die beheizte Presswalze des folgenden Pressspaltes von einem Trockenzylinder gebildet wird.For drying the fibrous web, the press section generally follows a drying section with preferably several drying groups for drying the fibrous web. In the interest of a low risk of demolition, at least the first dryer section of the dryer section should be formed by a series of drying cylinders, between which guide rollers are arranged, wherein the fibrous web wraps around the drying cylinders and guide rollers in a meandering manner supported by a drying wire. This allows for simplification or conversions that the heated press roll of the following press nip is formed by a drying cylinder.
In den Bereichen zwischen Leitwalze und Trockenzylinder ist dabei dem Trockensieb eine Saugvorrichtung zugeordnet, welche die Haftung der Faserstoffbahn am Trockensieb verstärkt. Um die sichere und definierte Ablösung der Faserstoffbahn vom jeweiligen Trockenzylinder gewährleisten zu können, sollte in diesem Bereich eine Saugzone mit erhöhtem Unterdruck vorhanden sein. In Verbindung mit den relativ hohen Trockengehalten in der Pressenpartie sowie einer möglichst geschlossenen Führung der Faserstoffbahn erlaubt dies sehr hohe Bahngeschwindigkeiten.In the areas between the guide roller and the drying cylinder, a suction device is assigned to the drying wire, which reinforces the adhesion of the fibrous web to the drying wire. In order to ensure the safe and defined detachment of the fibrous web from the respective drying cylinder, a suction zone with increased negative pressure should be present in this area. In conjunction with the relatively high dry contents in the press section and a possible closed guidance of the fibrous web, this allows very high web speeds.
Eine besonders einfacher Aufbau ergibt sich, wenn das Transferband über der Faserstoffbahn verläuft. Dabei kann das unter dem Transferband verlaufende Entwässerungsband die Faserstoffbahn direkt an das oberhalb der Faserstoffbahn verlaufende Entwässerungsband des folgenden Pressspaltes übergeben. Dies wiederum erlaubt es, dass die unter der Faserstoffbahn angeordnete, glatte Presswalze des folgenden Pressspaltes die Faserstoffbahn vorzugsweise direkt an das oberhalb der Faserstoffbahn verlaufende Trockensieb der ersten Trockengruppe übergibt. Trockengruppen mit oberhalb der Faserstoffbahn verlaufendem Trockensieb bieten erhebliche Vorteile bei eventuellem Abriss oder beim Überführen, da die Faserstoffbahn problemlos in den Maschinenkeller abgeführt werden kann. Dabei kann mit Vorteil, die Übergabe der Faserstoffbahn an das Trockensieb von einer vom Trockensieb umschlungenen Saugeinrichtung in Form einer Saugwalze, eines Saugkastens o.ä. unterstützt werden.A particularly simple structure results when the transfer belt runs over the fibrous web. In this case, the dewatering belt running under the transfer belt can transfer the fibrous web directly to the dewatering belt of the following press nip extending above the fibrous web. This in turn allows the smooth press roller of the following press nip arranged below the fibrous web to transfer the fibrous web preferably directly to the dryer fabric of the first dryer group running above the fibrous web. Drying groups with dryer fabric running above the fibrous web offer considerable advantages in case of possible demolition or during transfer, since the fibrous web can be discharged into the machine cellar without difficulty. It can with advantage, the transfer of the fibrous web to the dryer fabric of a looped by the dryer fabric suction device in the form of a suction roll, a suction box or the like. get supported.
Sollte jedoch das Transferband unter der Faserstoffbahn verlaufen, so wird die Faserstoffbahn vom Transferband an ein weiteres, vorzugsweise luftdurchlässiges Transferband und von diesem an das unterhalb der Faserstoffbahn verlaufende Entwässerungsband des folgenden Pressspaltes übergeben. Die Entwässerungsbänder sollten als Pressfilze ausgebildet sein. Das glatte Transferband sollte luft- und wasserundurchlässig sein.However, should the transfer belt run below the fibrous web, the fibrous web is transferred from the transfer belt to another, preferably air-permeable transfer belt and from there to the running below the fibrous web dewatering belt of the following press nip. The drainage tapes should be designed as press felts. The smooth transfer belt should be impermeable to air and water.
Es ist auch möglich, dass das glatte Transferband nur durch den letzten Pressspalt läuft und die glatte Presswalze im zweiten Pressspalt vorhanden ist und mit der Faserstoffbahn in Kontakt kommt.It is also possible that the smooth transfer belt runs only through the last press nip and the smooth press roll is present in the second press nip and comes into contact with the fibrous web.
Auch die Realisierung eines Glättspaltes durch die glatte Presswalze und das gegenüberliegende Transferband der anderen Presswalze dieses Pressspaltes kann Vorteile bringen.The realization of a smoothing gap by the smooth press roll and the opposite transfer belt of the other press roll of this press nip can bring benefits.
Nachfolgend soll die Erfindung an einem Ausführungsbeispiel näher erläutert werden.The invention will be explained in more detail with reference to an exemplary embodiment.
In der beigefügten Zeichnung zeigt die Figur eine schematischen Querschnitt durch eine erfindungsgemäße Pressenpartie sowie den Beginn einer folgenden Trockenpartie einer Papiermaschine zur Herstellung der Faserstoffbahn 1.In the accompanying drawing, the figure shows a schematic cross section through a press section according to the invention and the beginning of a following drying section of a paper machine for producing the fibrous web. 1
Die Pressenpartie besitzt drei Pressspalte, die von jeweils zwei rotierenden und gegeneinander gepressten Presswalzen 7,8,9,10,11,12 gebildet werden, wobei neben der Faserstoffbahn 1 zumindest ein Entwässerungsband 2,3,4,5 durch jeden Pressspalt geführt wird. Die endlos umlaufenden Entwässerungsbänder 2,3,4,5 dienen zur Aufnahme und dem Abtransport des im Pressspalt aus der Faserstoffbahn 1 gepressten Wassers und sind hier als luft- und wasserdurchlässige Pressfilze ausgebildet.The press section has three press nips, which are formed by two rotating
Die ersten beiden Pressspalte der Pressenpartie sind verlängert ausgeführt und werden jeweils von einer oberhalb der Faserstoffbahn 1 liegenden Schuhwalze 9,11 sowie einer unteren zylindrischen Gegenwalze 10,12 gebildet. Der verlängerte Pressspalt ermöglicht eine intensive und dennoch schonende Entwässerung der Faserstoffbahn 1. Zur Bildung eines verlängerten Pressspaltes besitzen die Schuhwalzen 9,11 einen flexiblen Walzenmantel, der im Bereich des Pressspaltes über ein Anpresselement mit konkaver Pressfläche geführt wird.The first two press nips of the press section are designed to be extended and are each formed by a
Wegen des großen Wasseranfalls insbesondere im ersten Pressspalt wird durch diesen beidseitig der Faserstoffbahn 1 je ein Entwässerungsband 2,3 geführt. Dabei übernimmt das oberhalb der Faserstoffbahn 1 laufende Entwässerungsband 2 die Faserstoffbahn 1 von einem Formersieb 18 eines der Pressenpartie vorgelagerten Formers zur Blattbildung.Because of the large amount of water, especially in the first press nip, a dewatering belt 2, 3 is guided through this on both sides of the fibrous web 1. In the process, the dewatering belt 2 running above the fibrous web 1 takes over the fibrous web 1 from a forming
Das untere Entwässerungsband 3 des ersten Pressspaltes übergibt die Faserstoffbahn 1 nach dem Pressspalt an ein glattes, endlos umlaufendes sowie luft- und wasserundurchlässiges Transferband 6 des zweiten Pressspaltes, welches über der Faserstoffbahn 1 verläuft. Die Faserstoffbahn 1 durchläuft anschließend gemeinsam mit dem Transferband 6 und dem unterhalb verlaufenden Entwässerungsband 4 den zweiten Pressspalt. Wegen der Vorentwässerung im ersten, vorgelagerten Pressspalt genügt im zweiten Pressspalt ein Entwässerungsband 4 zur Aufnahme des ausgepressten Wassers. Durch den Kontakt mit dem glatten Transferband 6 kommt es im zweiten Pressspalt neben einer weiteren Entwässerung zur Glättung der Oberseite der Faserstoffbahn 1.The lower dewatering belt 3 of the first press nip transfers the fibrous web 1 after the press nip to a smooth, endlessly circulating and air- and water-impermeable transfer belt 6 of the second press nip, which extends over the fibrous web 1. The fibrous web 1 then passes through together with the transfer belt 6 and the running below Dewatering belt 4 the second press nip. Because of the pre-dewatering in the first, upstream press nip a dewatering belt 4 is sufficient in the second press nip for receiving the squeezed water. As a result of the contact with the smooth transfer belt 6, in addition to a further dewatering in the second press nip, the upper side of the fibrous web 1 is smoothed.
Nach dem zweiten Pressspalt übergibt das untere Entwässerungsband 4 des zweiten Pressspaltes die Faserstoffbahn 1 an ein über der Faserstoffbahn 1 laufendes Entwässerungsband 5 des folgenden, letzten Pressspaltes der Pressenpartie. Dieser dritte Pressspalt wird von zwei zylindrischen Presswalzen 7,8 gebildet, von den eine durchbiegungsgesteuert ausgeführt ist. Dabei kommt die Faserstoffbahn 1 vor, im und nach dem letzten Pressspalt mit der unteren Presswalze 8 in direkten Kontakt. Zur Steigerung der Glätte der Unterseite der Faserstoffbahn 1 besitzt die untere Presswalze 8 daher eine glatte und geschlossene Oberfläche. Damit gelingt es die Zweiseitigkeit der Glätte wesentlich zu verringern. Außerdem ist die untere Presswalze 8 noch beheizt, so dass bereits eine Vortrocknung der Faserstoffbahn 1 stattfindet. Diese Beheizung fördert außerdem durch die Bildung eines Dampfpolsters die Ablösung und Übergabe der Faserstoffbahn 1 an ein Trockensieb 15 der ersten Trockengruppe der folgenden Trockenpartie zur Trocknung der Faserstoffbahn 1. Hierzu wird das Trockensieb 15 direkt an die untere Presswalze 8 geführt, wobei die Abnahme der Faserstoffbahn 1 von einer vom Trockensieb 15 umschlungenen Saugeinrichtung 16 in Form eines bekannten Saugkastens unterstützt wird.After the second press nip, the lower dewatering belt 4 of the second press nip transfers the fibrous web 1 to a
Zumindest die erste Trockengruppe wird von einer Reihe von Trockenzylindern 13 gebildet, zwischen denen Leitwalzen 14 angeordnet sind, wobei die Faserstoffbahn 1 mäanderförmig von dem Trockensieb 15 gestützt die Trockenzylinder 13 und Leitwalzen 14 umschlingt. Dabei kommt die Faserstoffbahn 1 zur Trocknung direkt in Kontakt mit den beheizten Trockenzylindern 13. In Bahnlaufrichtung 17 können dann noch ähnliche oder aber auch andere Trockengruppen der Trockenpartie folgen.At least the first dryer group is formed by a series of
Allgemein kann die Übernahme der Faserstoffbahn 1 durch ein luftdurchlässiges Entwässerungsband 2,5 mit Hilfe einer vom jeweiligen Entwässerungsband 2,5 umschlungenen besaugten Walze unterstützt werden.In general, the acquisition of the fibrous web 1 by an air-permeable Dewatering belt 2.5 are supported by means of a suctioned by the respective dewatering belt 2.5 suctioned roller.
Es ist auch möglich das Transferband 6 unter der Faserstoffbahn 1 verlaufen zu lassen. Dann muss natürlich die glatte Presswalze 8 des folgenden, letzten Pressspaltes über der Faserstoffbahn 1 angeordnet werden. Hierbei kann sich die Zwischenschaltung eines luftdurchlässigen Transferbandes notwendig machen.It is also possible to let the transfer belt 6 run under the fibrous web 1. Then, of course, the smooth press roller 8 of the following, last press nip must be arranged above the fibrous web 1. Here, the interposition of an air-permeable transfer belt may be necessary.
Claims (18)
- Press section for dewatering a paper, cardboard, tissue or other fibrous material web (1) comprising at least three press nips, wherein at least one endlessly circulating dewatering belt (2, 3, 4, 5) is passed alongside the fibrous material web (1) through each press nip for taking up the water pressed out of the web, at least one press roll (8) forming a press nip has a smooth surface and is in contact with the fibrous material web (1), the fibrous material web (1) is passed through at least one press nip together with an endlessly circulating smooth transfer belt (6), and the transfer belt (6) is in contact with the side of the fibrous material web (1) opposite the smooth press roll (8), characterized in that the transfer belt (6) runs over the fibrous material web (1) and the dewatering belt (4) running under the transfer belt (6) transfers the fibrous material web (1) directly to the dewatering belt (5) of the following press nip running above the fibrous material web (1) or the transfer belt (6) runs under the fibrous material web (1) and the fibrous material web (1) is transferred from the transfer belt (6) to a further, preferably air-permeable transfer belt and from this to the dewatering belt of the following press nip running underneath the fibrous material web (1).
- Press section according to Claim 1, characterized in that the transfer belt (6) runs through only one press nip.
- Press section according to Claim 2, characterized in that the fibrous material web (1) passes from the press nip with the transfer belt (6) to a following press nip, wherein this following press nip is formed between two press rolls (7, 8), one (8) of which has a smooth surface and is in contact with the fibrous material web (1).
- Press section according to one of the preceding claims, characterized in that the press nip with the transfer belt (6) is extended and preferably formed between a shoe roll (9) and a cylindrical opposing roll (10).
- Press section according to one of the preceding claims, characterized in that a press nip is disposed upstream of the press nip with the transfer belt (6) and this upstream press nip preferably forms the first press nip in the press section.
- Press section according to Claim 5, characterized in that a dewatering belt (2, 3) is passed on each side of the fibrous material web (1) through the upstream press nip.
- Press section according to Claim 5 or 6, characterized in that the upstream press nip is extended and preferably formed between a shoe roll (11) and a cylindrical opposing roll (12).
- Press section according to one of the preceding Claims 3 to 7, characterized in that the press nip following the press nip with the transfer belt (6) is the last press nip in the press section.
- Press section according to one of the preceding Claims 3 to 8, characterized in that the press nip following the press nip with the transfer belt (6) is formed between two cylindrical press rolls (7, 8).
- Press section according to one of the preceding Claims 3 to 9, characterized in that at least one press roll (8) forming the press nip following the press nip with the transfer belt (6) is heated, with said heated press roll (8) preferably being in contact with the fibrous material web (1).
- Press section according to one of the preceding claims, characterized in that the fibrous material web (1) is supported from at least the first to the last press nip in the press section by at least one belt in the form of a dewatering belt (2, 3, 4, 5) or transfer belt (6).
- Press section according to one of the preceding claims, characterized in that a dryer section comprising preferably a plurality of dryer groups for drying the fibrous material web (1) is disposed following the press section.
- Press section according to Claim 12, characterized in that at least the first dryer group of the dryer section comprises a series of drying cylinders (13) having guide rolls (14) arranged between them, wherein the fibrous material web (1), being supported by a drying screen (15), winds around the drying cylinders (13) and guide rolls (14) along a meandering path.
- Press section according to Claim 12 or 13, characterized in that the heated press roll (8) of the following press nip is formed by a drying cylinder (13).
- Press section according to one of the preceding Claims 12 to 14, characterized in that the transfer belt (6) runs over the fibrous material web (1) and the dewatering belt (4) running under the transfer belt transfers the fibrous material web directly to the dewatering belt (5) of the following press nip running above the fibrous material web and the press roll (8) of the following press nip disposed under the fibrous material web (1) transfers the fibrous material web (1) preferably directly to the drying screen (15) of the first dryer group running above the fibrous material web (1).
- Press section according to Claim 15, characterized in that the transfer of the fibrous material web (1) to the drying screen (15) is supported by a suction device (16) in the form of a suction roll or suction box, over which the drying screen (15) is wound.
- Press section according to one of the preceding claims, characterized in that the dewatering belts (2, 3, 4, 5) comprise press felts.
- Press section according to one of the preceding claims, characterized in that the smooth transfer belt (6) is air- and water-impermeable.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10159115A DE10159115A1 (en) | 2001-12-01 | 2001-12-01 | press section |
| DE10159115 | 2001-12-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1316641A1 EP1316641A1 (en) | 2003-06-04 |
| EP1316641B1 true EP1316641B1 (en) | 2006-10-04 |
Family
ID=7707748
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02016712A Expired - Fee Related EP1316641B1 (en) | 2001-12-01 | 2002-07-26 | Press section |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US6863776B2 (en) |
| EP (1) | EP1316641B1 (en) |
| AT (1) | ATE341661T1 (en) |
| DE (2) | DE10159115A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011005747A1 (en) | 2011-03-18 | 2012-09-20 | Voith Patent Gmbh | Sheet binding device |
| DE102011081239A1 (en) | 2011-08-19 | 2013-02-21 | Voith Patent Gmbh | Sheet forming apparatus for manufacturing two or multi-layered cardboard- or packing paper web using machine, has belt that directly incorporates one layer and indirectly incorporates another layer made of fiber material suspension |
| DE102011083367A1 (en) | 2011-09-26 | 2013-03-28 | Voith Patent Gmbh | Former for machine for manufacturing fibrous material web e.g. paper web, from fibrous material suspension, has lower wire, and felt enclosing suction roller and guided over conducting and adjustable rollers for adjusting felt strain |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7601244B2 (en) * | 2003-05-13 | 2009-10-13 | Oji Paper Co., Ltd. | Press for paper machine with smoothing press, and paper production method |
| FI114647B (en) * | 2003-07-02 | 2004-11-30 | Metso Paper Inc | An arrangement for controlling the web with a press section of a paper or board machine |
| DE10333139A1 (en) * | 2003-07-22 | 2005-02-17 | Voith Paper Patent Gmbh | Press section to extract water from a wet web, in a machine for the production/finishing of paper/cardboard/tissue, has a suction roller and a suction unit to take the web with a fourdrinier and blanket between them |
| DE10342733A1 (en) * | 2003-09-16 | 2005-04-21 | Voith Paper Patent Gmbh | Press section to extract water from a wet web, of paper or cardboard or tissue, has an impermeable transfer belt around the first press roller to pass the web on to the next station without web damage |
| DE102005001890A1 (en) * | 2005-01-15 | 2006-07-20 | Voith Paper Patent Gmbh | Press arrangement |
| DE102005031202A1 (en) * | 2005-07-01 | 2007-01-25 | Voith Patent Gmbh | Process for producing a paper web, in particular gravure paper |
| DE102005050282A1 (en) * | 2005-10-20 | 2007-06-14 | Voith Patent Gmbh | Press arrangement |
| DE102005050281A1 (en) * | 2005-10-20 | 2007-04-26 | Voith Patent Gmbh | Press arrangement |
| WO2016042198A1 (en) * | 2014-09-15 | 2016-03-24 | Upm-Kymmene Corporation | Process to manufacture low weight high quality paper for use as a support layer of a release! liner with a belt assembly |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01139890A (en) * | 1987-11-25 | 1989-06-01 | Mitsubishi Heavy Ind Ltd | Press apparatus of papermaking machine |
| DE4321406A1 (en) * | 1993-06-26 | 1993-11-11 | Voith Gmbh J M | Paper-making press section - has belt round first two rollers working with press rollers and shoe press for high water extraction and no difference between paper sides |
| DE4340041A1 (en) * | 1993-11-24 | 1994-04-07 | Voith Gmbh J M | Paper-making machine press section - has two sections with a web transport roller between the shoe presses for consistent character on both sides of the web |
| US5876565A (en) | 1994-10-06 | 1999-03-02 | Valmet Corporation | Press section with an equalizing nip for compensating for elongation of a paper web |
| FI95610C (en) | 1994-10-06 | 1996-02-26 | Valmet Paper Machinery Inc | Press section of a paper machine equipped with a compensating press |
| FI114227B (en) | 1995-04-24 | 2004-09-15 | Metso Paper Inc | Paper machine with press section and dryer section |
| US5766422A (en) * | 1996-08-01 | 1998-06-16 | Beloit Technologies, Inc. | Lightweight high temperature pressing |
| DE19633422A1 (en) * | 1996-08-20 | 1998-02-26 | Voith Sulzer Papiermasch Gmbh | Press section and method for dewatering an aqueous fibrous web |
-
2001
- 2001-12-01 DE DE10159115A patent/DE10159115A1/en not_active Withdrawn
-
2002
- 2002-07-26 AT AT02016712T patent/ATE341661T1/en active
- 2002-07-26 DE DE50208327T patent/DE50208327D1/en not_active Expired - Lifetime
- 2002-07-26 EP EP02016712A patent/EP1316641B1/en not_active Expired - Fee Related
- 2002-09-20 US US10/247,339 patent/US6863776B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011005747A1 (en) | 2011-03-18 | 2012-09-20 | Voith Patent Gmbh | Sheet binding device |
| WO2012126875A1 (en) | 2011-03-18 | 2012-09-27 | Voith Patent Gmbh | Sheet forming device |
| DE102011081239A1 (en) | 2011-08-19 | 2013-02-21 | Voith Patent Gmbh | Sheet forming apparatus for manufacturing two or multi-layered cardboard- or packing paper web using machine, has belt that directly incorporates one layer and indirectly incorporates another layer made of fiber material suspension |
| DE102011083367A1 (en) | 2011-09-26 | 2013-03-28 | Voith Patent Gmbh | Former for machine for manufacturing fibrous material web e.g. paper web, from fibrous material suspension, has lower wire, and felt enclosing suction roller and guided over conducting and adjustable rollers for adjusting felt strain |
Also Published As
| Publication number | Publication date |
|---|---|
| DE10159115A1 (en) | 2003-06-18 |
| EP1316641A1 (en) | 2003-06-04 |
| ATE341661T1 (en) | 2006-10-15 |
| US20030101881A1 (en) | 2003-06-05 |
| US6863776B2 (en) | 2005-03-08 |
| DE50208327D1 (en) | 2006-11-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE4224730C1 (en) | Tissue paper mfg. machine preventing moisture return - comprises shoe press for press unit(s) for drying tissue web, for min. press units | |
| EP1316641B1 (en) | Press section | |
| DE19756422A1 (en) | Machine for producing a fibrous web, in particular a tissue paper web | |
| EP3837394A1 (en) | Paper machine and method for producing a paper or paperboard web | |
| DE4340041A1 (en) | Paper-making machine press section - has two sections with a web transport roller between the shoe presses for consistent character on both sides of the web | |
| EP0931876B1 (en) | Press section | |
| EP1777342B1 (en) | Pressing arrangement | |
| EP1739228B1 (en) | Machine for manufacturing a fibrous web | |
| DE19801417A1 (en) | Papermaking web press section for water extraction | |
| AT521367B1 (en) | DEVICE AND METHOD FOR CONVERTING A STRIP OF A TRAIN | |
| DE102012202535A1 (en) | Dewatering device for fiber web machine, comprises metal band and counter roller, around which metal band is arranged to run, such that dewatering gap is formed between metal band and counter roller | |
| DE102016123433A1 (en) | Press arrangement | |
| DE10305754A1 (en) | Press section for a paper/cardboard web has rough and smooth continuous belts flanking the web through a press gap, then the rough belt is detached and the smooth belt presses the web against a smooth press surface | |
| DE10226825A1 (en) | Press arrangement | |
| WO2009092477A1 (en) | Device for producing and/or processing a fiber material web | |
| AT521368B1 (en) | DEVICE AND METHOD FOR CONVERTING A STRIP OF A TRAIN | |
| DE10137095A1 (en) | Machine for the production of a fibrous web | |
| DE102004003674A1 (en) | Papermaking de-watering press feeds paper, carton or tissue through three de-watering nip gaps to a fourth nip gap with de-watering belt | |
| DE20122810U1 (en) | press section | |
| EP0930392A2 (en) | Press section | |
| DE102005009858A1 (en) | paper machine | |
| DE10132652A1 (en) | Press assembly, for wet lightweight paper/cardboard webs, has a single shoe press with an extended press nip and continuous blankets flanking the web with a drive for at least one blanket | |
| DE202005020882U1 (en) | Dewatering and drying station for paper mill, e.g. for carton, paper or tissue paper has nip gap formed by drying cylinder and smoothing drum | |
| EP0764738A1 (en) | Process and machine for making fibrous webs | |
| EP1777340A1 (en) | Pressing arrangement |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR |
|
| AX | Request for extension of the european patent |
Extension state: AL LT LV MK RO SI |
|
| 17P | Request for examination filed |
Effective date: 20031204 |
|
| AKX | Designation fees paid |
Designated state(s): AT DE FI IT SE |
|
| GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
| GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: VOITH PATENT GMBH |
|
| AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT DE FI IT SE |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED. Effective date: 20061004 |
|
| REF | Corresponds to: |
Ref document number: 50208327 Country of ref document: DE Date of ref document: 20061116 Kind code of ref document: P |
|
| REG | Reference to a national code |
Ref country code: SE Ref legal event code: TRGR |
|
| PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
| 26N | No opposition filed |
Effective date: 20070705 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 20090715 Year of fee payment: 8 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20110725 Year of fee payment: 10 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20100727 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FI Payment date: 20120711 Year of fee payment: 11 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20120720 Year of fee payment: 11 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: AT Payment date: 20120711 Year of fee payment: 11 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20120726 |
|
| REG | Reference to a national code |
Ref country code: AT Ref legal event code: MM01 Ref document number: 341661 Country of ref document: AT Kind code of ref document: T Effective date: 20130726 |
|
| REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 50208327 Country of ref document: DE Effective date: 20140201 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20140201 Ref country code: FI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20130726 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: AT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20130726 |