EP0598991B1 - Press section for a paper machine - Google Patents

Press section for a paper machine Download PDF

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Publication number
EP0598991B1
EP0598991B1 EP93112772A EP93112772A EP0598991B1 EP 0598991 B1 EP0598991 B1 EP 0598991B1 EP 93112772 A EP93112772 A EP 93112772A EP 93112772 A EP93112772 A EP 93112772A EP 0598991 B1 EP0598991 B1 EP 0598991B1
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EP
European Patent Office
Prior art keywords
press
belt
section
deflection
paper web
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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.)
Expired - Lifetime
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EP93112772A
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German (de)
French (fr)
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EP0598991A1 (en
Inventor
Udo Grossmann
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JM Voith GmbH
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JM Voith GmbH
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Priority to DE9321098U priority Critical patent/DE9321098U1/en
Publication of EP0598991A1 publication Critical patent/EP0598991A1/en
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Publication of EP0598991B1 publication Critical patent/EP0598991B1/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0063—Devices for threading a web tail through a paper-making machine

Definitions

  • the invention relates to a press section for a paper machine with at least one press unit, and to a section downstream of the press section. Reference is made to the preamble of claim 1.
  • Another “pressing unit” is primarily considered as a “downstream batch”.
  • This can be a simple roller press with two rotatably mounted press rollers.
  • a so-called shoe press comes into consideration, which has a rotatably mounted roller, a press shoe which can be set against this roller and a sliding belt which is guided through the press nip between the press shoe and the roller.
  • the "downstream section” can also be the dryer section of the paper machine.
  • a press section according to the preamble of claim 1 has become known from US-A-4 561 939.
  • This known device comprises a first press unit with two press rolls, and also a shoe press connected downstream of this. Both press units each have a top felt and a bottom felt.
  • WO 88/08051 also describes two press units, both of which are shoe presses.
  • a transfer device between a suction roll serves the two press units.
  • the paper web has an S-shaped course in the transfer area.
  • the two press units are double-felted.
  • the transfer area between the press unit (which may be the only press unit or one of several press units) is problematic.
  • the transfer area should be designed in such a way that the paper web is optimally dewatered in the upstream press unit. This is of course the most important function of a press section.
  • the transfer strip should be transferred easily and reliably from the first press unit to the downstream section. To date, these two requirements have not been satisfactorily met at the same time.
  • the paper web runs together with the upper felt and the lower felt through the press nip of the press unit. The paper web is sandwiched between these two felts.
  • the two felt belts absorb water from the paper web in the press nip.
  • the press pressure naturally stops.
  • the two felt belts should be separated from the paper web as soon as possible after passing through the press nip. Accordingly, at least the one strand of felt would have to be guided after leaving the press nip in such a way that an angle of divergence arises between the paper web and the felt belt.
  • the invention has for its object to design a press section for a paper machine with a downstream unit so that the problems of the transfer area are avoided.
  • the machine should accordingly be designed in such a way that both an optimal pressing work is guaranteed during normal operation, with as little rewetting of the paper web as possible, and also a perfect transfer of the transfer strip when it is inserted after a machine stop.
  • the two deflection rollers which deflect the upper and lower felt belt of the first (and possibly only) press unit after the press nip, are mounted so that they can be moved or moved in such a way that they can be removed from the plane in which the paper web runs during normal operation.
  • the two units namely the first press unit and the downstream unit
  • the first press unit can be started up and brought up to normal speed, while the downstream unit initially stands still.
  • This can be useful in an initial phase, e.g. B. for running in the felts.
  • the paper web runs through the first press unit, and possibly through the second press unit, and is then passed into a chest located below the press in the machine cellar. This downward derivation is facilitated or only made possible by the movability of the two deflecting rollers according to the invention.
  • one of the two deflecting rollers is moved in such a way that an angle of divergence is formed between the paper web and the felt belt in question.
  • the three figures of the drawing show a press section of a paper machine seen in a side view.
  • the press section is shown in the three figures in three different operating phases.
  • the press section comprises two press units, each of which is designed as a shoe press.
  • the first press in the running direction of the paper web (see arrow A) comprises a press roll 1.
  • a press element which essentially consists of a press shoe 2 and an impermeable press belt 3 wrapping around it. These two form a press nip with each other, which has a considerable extent in the running direction of the paper web.
  • Two felt belts 4 and 5 are passed through the press nip.
  • the two press belts loop around a series of internals.
  • the lower felt belt 4 wraps around guide rollers 6, 7, and the upper felt belt 5 a suction take-off roller 8, a pipe suction device 9 and a guide roller 10. Further guide rollers are present, but not shown here.
  • the suction guide roller 8 decreases from the wire section, namely from wire 11, the paper web brought up.
  • the second press unit in turn has a press roll 1.1, and a press element cooperating with it, comprising a press shoe 2.1 and a rotating press belt 3.1 wrapping around the press shoe.
  • the second press unit In contrast to the first press unit, which is double felted, the second press unit has only a single felt belt, namely the bottom felt 12.
  • the drying section adjoins the second press unit, of which only a guide roller 20 and a drying wire 21 can be seen here.
  • the paper web is transferred from the press roller 1.1 to the drying wire 21.
  • transfer rollers At least the two last guide rollers 7 and 10, viewed in the direction of travel of the paper web, called “transfer rollers" in this application, can be moved in the direction of arrows B and C.
  • the movability can be carried out in practice in the form of guide rails, which run in the direction of arrows B and C, and on which bearings of the two transfer rollers can be moved, or by means of swivel levers.
  • a transfer scraper 1.5 is provided on the press roller 1.1.
  • paper stock suspension is applied to the screen 11 through a headbox, not shown here. Then the path continues. Here either only a narrow transfer strip is listed, or the entire paper web. Then the transfer strips or the paper web automatically run to the unit downstream of the first press unit, that is to say e.g. B. another press unit.
  • the two deflecting rollers 7 and 10 are brought into such positions that the two felt belts 4 and 5 run in parallel for as long as possible. This is the level in which the paper web later runs in normal operation.
  • This phase is shown in Fig. 2.
  • roller 7 is in its upper position (as already shown in FIG. 1) while roller 10 is lowered, to the extent that felt belt 5 now touches bottom felt 12 of the second press unit. This is in the area of a guide roller 13 of the bottom felt 12.
  • Guide roller 13 has a suction zone 14.
  • the pipe suction vacuum is open, so that the pipe suction device 9 works and holds the transfer strip or the web on the upper felt 5.
  • Fig. 3 illustrates the normal operating state.
  • the transfer strip is expanded to the full width of the web at some point so that the full width of the web passes through the first press unit, over the transfer point and through the second press unit.
  • the roller 7 is lowered in the direction of arrow B.
  • the pipe suction device on the one hand reduces the rewetting of the paper web after passing through the first press nip, on the other hand it prevents the web from sticking to the bottom felt 4 and continuing to run with it. Upper felt 5 and web thus run out of the first press nip.
  • the vacuum on the pipe suction device 9 is then switched off so that the web can lengthen after the double felted, first press unit.

Abstract

The invention relates to a press section for a paper machine having at least one press unit, as well as sections connected after the press section, e.g. a second press unit or a drying section, furthermore having wires or felts (4, 5) which are guided through the press nips and having deflection rolls (7, 10) connected after the press nip, which guide the respective wire or felt away from the paper web, and having a suction pipe (9), which is arranged between the press nip of the first press unit and the first deflection roll. In such press sections having after-connected units, the transfer region is particularly problematical and, to be specific, with respect to the proper transfer of the tail or of the paper web, likewise also, however, from the point of view of optimal dewatering. According to the invention, the two deflection rolls (7, 10), are movable in the transfer region such that they can be moved away from or closer to the paper web. <IMAGE>

Description

Die Erfindung betrifft eine Pressenpartie für eine Papiermaschine mit wenigstens einer Presseneinheit, sowie eine der Pressenpartie nachgeschaltete Partie. Auf den Oberbegriff von Anspruch 1 wird verwiesen.The invention relates to a press section for a paper machine with at least one press unit, and to a section downstream of the press section. Reference is made to the preamble of claim 1.

Als "nachgeschaltete Partie" kommt in erster Linie eine weitere Preßeinheit in Betracht. Diese kann eine einfache Walzenpresse mit zwei drehbar gelagerten Preßwalzen sein. Weiterhin kommt eine sogenannte Schuhpresse in Betracht, die eine drehbar gelagerte Walze aufweist, ferner einen gegen diese Walze anstellbaren Preßschuh und ein Gleitband, das durch den Preßspalt zwischen Preßschuh und Walze hindurchgeführt ist. Schließlich kann die "nachgeschaltete Partie" auch die Trockenpartie der Papiermaschine sein.Another "pressing unit" is primarily considered as a "downstream batch". This can be a simple roller press with two rotatably mounted press rollers. Furthermore, a so-called shoe press comes into consideration, which has a rotatably mounted roller, a press shoe which can be set against this roller and a sliding belt which is guided through the press nip between the press shoe and the roller. Finally, the "downstream section" can also be the dryer section of the paper machine.

Eine Pressenpartie gemäß dem Oberbegriff von Anspruch 1 ist aus US-A-4 561 939 bekanntgeworden. Diese bekannte Einrichtung umfaßt eine erste Preßeinheit mit zwei Preßwalzen, ferner eine dieser nachgeschaltete Schuhpresse. Beide Preßeinheiten haben je einen Oberfilz und einen Unterfilz.A press section according to the preamble of claim 1 has become known from US-A-4 561 939. This known device comprises a first press unit with two press rolls, and also a shoe press connected downstream of this. Both press units each have a top felt and a bottom felt.

WO 88/08051 beschreibt ebenfalls zwei Preßeinheiten, welche beide Schuhpressen sind. Als Überführungseinrichtung zwischen den beiden Preßeinheiten dient eine Saugwalze. Im Überführbereich hat die Papierbahn einen S-förmigen Verlauf. Auch hier sind die beiden Preßeinheiten doppeltbefilzt.WO 88/08051 also describes two press units, both of which are shoe presses. As a transfer device between a suction roll serves the two press units. The paper web has an S-shaped course in the transfer area. Here, too, the two press units are double-felted.

Allgemein ist der Übergabebereich zwischen der Preßeinheit (die die einzige Preßeinheit oder eine von mehreren Preßeinheiten sein kann) mit Problemen behaftet. Einerseits soll nämlich der Übergabebereich derart gestaltet sein, daß die Papierbahn in der vorgeschalteten Preßeinheit in optimaler Weise entwässert wird. Dies ist natürlich die wichtigste Funktion einer Pressenpartie. Andererseits soll aber auch beim Anfahren der Papiermaschine nach deren Stillstand der Überführstreifen leicht und zuverlässig von der ersten Preßeinheit auf die nachgeschaltete Partie überführt werden. Diese beiden Forderungen konnten bis heute nicht gleichzeitig in befriedigender Weise erfüllt werden. Bei einer doppeltbefilzten Preßeinheit läuft ja die Papierbahn gemeinsam mit dem Oberfilz und dem Unterfilz durch den Preßspalt der Preßeinheit. Hierbei ist die Papierbahn sandwichartig zwischen diesen beiden Filzen eingehüllt. Die beiden Filzbänder nehmen im Preßspalt Wasser aus der Papierbahn auf. Beim Austreten aus dem Preßspalt hört der Preßdruck natürlich auf. An dieser Stelle besteht die Gefahr, daß Wasser aus den beiden Filzbändern wieder zur Papierbahn zurückströmt, so daß diese rückbefeuchtet wird. Um dies zu vermeiden, sollten die beiden Filzbänder nach dem Durchlaufen des Preßspaltes möglichst sofort von der Papierbahn getrennt werden. Demgemäß müßte wenigstens das eine Filztrum nach dem Verlassen des Preßspaltes derart geführt werden, daß ein Divergenzwinkel zwischen Papierbahn und Filzband entsteht. Andererseits erfordert jedoch das sogenannte Aufführen, d.h. das Hindurchführen eines schmalen Papierstreifens oder der gesamten Papierbahn nach dem Stillsetzen der Papiermaschine oder nach einem Abriß eine möglichst geradlinige Führung des Bahnanfanges im Überführbereich. Eine divergente Führung zwischen dem Bahnanfang einerseits und dem Filzband andererseits ist daher unerwünscht.Generally, the transfer area between the press unit (which may be the only press unit or one of several press units) is problematic. On the one hand, the transfer area should be designed in such a way that the paper web is optimally dewatered in the upstream press unit. This is of course the most important function of a press section. On the other hand, even when the paper machine is started up after it has come to a standstill, the transfer strip should be transferred easily and reliably from the first press unit to the downstream section. To date, these two requirements have not been satisfactorily met at the same time. With a double-felted press unit, the paper web runs together with the upper felt and the lower felt through the press nip of the press unit. The paper web is sandwiched between these two felts. The two felt belts absorb water from the paper web in the press nip. When exiting the press nip, the press pressure naturally stops. At this point there is a risk that water will flow back from the two felt belts back to the paper web so that it is rewet. To avoid this, the two felt belts should be separated from the paper web as soon as possible after passing through the press nip. Accordingly, at least the one strand of felt would have to be guided after leaving the press nip in such a way that an angle of divergence arises between the paper web and the felt belt. On the other hand, however, the so-called threading, that is to say the passing of a narrow paper strip or the entire paper web after the paper machine has come to a standstill or after tearing, requires that the beginning of the web in the transfer area be guided as straight as possible. A divergent guidance between the beginning of the web on the one hand and the felt belt on the other hand is therefore undesirable.

Statt der genannten Preßfilze werden gelegentlich auch Siebe verwendet.Sieves are occasionally used instead of the press felts mentioned.

Der Erfindung liegt die Aufgabe zugrunde, eine Pressenpartie für eine Papiermaschine mit einer nachgeschalteten Einheit derart zu gestalten, daß die Probleme des Überführbereiches vermieden werden. Die Maschine soll demgemäß derart gestaltet werden, daß sowohl eine optimale Preßarbeit während des Normalbetriebes gewährleistet ist, mit möglichst geringer Rückbefeuchtung der Papierbahn, als auch eine einwandfreie Überführung des Überführstreifens bei dessen Aufführen nach einem Maschinenstillstand.The invention has for its object to design a press section for a paper machine with a downstream unit so that the problems of the transfer area are avoided. The machine should accordingly be designed in such a way that both an optimal pressing work is guaranteed during normal operation, with as little rewetting of the paper web as possible, and also a perfect transfer of the transfer strip when it is inserted after a machine stop.

Diese Aufgabe wird durch die kennzeichnenden Merkmale von Anspruch 1 gelöst. Demgemäß werden die beiden Umlenkwalzen, die das obere und das untere Filzband der ersten (und möglicherweise einzigen) Preßeinheit nach dem Preßspalt umlenken, derart verschiebbar oder verfahrbar gelagert, daß sie aus der Ebene entfernt werden können, in der die Papierbahn während des Normalbetriebes verläuft.This object is solved by the characterizing features of claim 1. Accordingly, the two deflection rollers, which deflect the upper and lower felt belt of the first (and possibly only) press unit after the press nip, are mounted so that they can be moved or moved in such a way that they can be removed from the plane in which the paper web runs during normal operation.

Im einzelnen ergeben sich hieraus die folgenden Vorteile:The individual advantages are as follows:

Nach einem Stillstand der Papiermaschine oder nach einem Bahnabriß können die beiden Einheiten, nämlich die erste Presseneinheit sowie die nachgeschaltete Einheit, völlig unabhängig voneinander laufen. So kann beispielsweise die erste Presseneinheit (gegebenenfalls die einzige Presseneinheit) angefahren und auf Normalgeschwindigkeit gebracht werden, während die nachgeschaltete Einheit zunächst stillsteht. Dies kann in einer Anfangsphase zweckmäßig sein, z. B. zum Einlaufen der Filze. Die Papierbahn läuft während einer Anfangsphase noch durch die erste Presseneinheit hindurch, und gegebenenfalls durch die zweite Presseneinheit, und wird sodann in eine unterhalb der Presse im Maschinenkeller befindliche Bütte geleitet. Dieses Ableiten nach unten wird erleichtert oder erst ermöglicht durch die erfindungsgemäße Verfahrbarkeit der beiden Umlenkwalzen.After the paper machine has come to a standstill or after a web break, the two units, namely the first press unit and the downstream unit, can run completely independently of one another. For example, the first press unit (possibly the only press unit) can be started up and brought up to normal speed, while the downstream unit initially stands still. This can be useful in an initial phase, e.g. B. for running in the felts. During an initial phase, the paper web runs through the first press unit, and possibly through the second press unit, and is then passed into a chest located below the press in the machine cellar. This downward derivation is facilitated or only made possible by the movability of the two deflecting rollers according to the invention.

Aufgrund der erfindungsgemäßen Verfahrbarkeit der Umlenkwalzen läßt sich eine im wesentlichen geradlinige Bahnführung erzielen. Dies ermöglicht eine einwandfreie und unproblematische Führung sowohl des Überführstreifens als auch der kompletten Bahn. Außerdem ist hierdurch sichergestellt, daß die Papierbahn während des Überführvorganges, aber auch später bei kompletter Bahn, am Übergabefilz (Oberfilz) bleibt.Due to the movability of the deflecting rollers according to the invention, an essentially straight web guidance can be achieved. This enables perfect and unproblematic guidance of both the transfer strip and the complete web. This also ensures that the paper web remains on the transfer felt (top felt) during the transfer process, but also later when the web is complete.

Sobald sich stabiler Betrieb eingestellt hat, wird die eine der beiden Umlenkwalzen derart verfahren, daß sich ein Divergenzwinkel zwischen der Papierbahn und dem betreffenden Filzband bildet.As soon as stable operation has occurred, one of the two deflecting rollers is moved in such a way that an angle of divergence is formed between the paper web and the felt belt in question.

Die drei Figuren der Zeichnung zeigen eine Pressenpartie einer Papiermaschine in einer Seitenansicht gesehen. Dabei ist die Pressenpartie in den drei Figuren in drei verschiedenen Betriebsphasen gezeigt.The three figures of the drawing show a press section of a paper machine seen in a side view. The press section is shown in the three figures in three different operating phases.

Die Pressenpartie umfaßt zwei Preßeinheiten, die jeweils als Schuhpressen ausgebildet sind. Die in Laufrichtung der Papierbahn (siehe Pfeil A) erste Presse umfaßt eine Preßwalze 1. Dieses arbeitet mit einem Preßelement zusammen, welches im wesentlichen aus einem Preßschuh 2 und einem diesen umschlingenden, undurchlässigen Preßband 3 besteht. Diese beiden bilden einen Preßspalt miteinander, der in Laufrichtung der Papierbahn eine erhebliche Erstreckung hat. Durch den Preßspalt sind zwei Filzbänder 4 und 5 hindurchgeführt. Die beiden Preßbänder umschlingen außer den Preßelementen 1, 2 und 3 eine Reihe von Einbauten. So umschlingt das untere Filzband 4 Leitwalzen 6, 7, und das obere Filzband 5 eine Saugabnahmewalze 8, einen Rohrsauger 9 sowie eine Leitwalze 10. Weitere Leitwalzen sind vorhanden, aber hier nicht dargestellt. Die Saugleitwalze 8 nimmt von der Siebpartie, nämlich von Sieb 11, herangeführte Papierbahn ab.The press section comprises two press units, each of which is designed as a shoe press. The first press in the running direction of the paper web (see arrow A) comprises a press roll 1. This works together with a press element which essentially consists of a press shoe 2 and an impermeable press belt 3 wrapping around it. These two form a press nip with each other, which has a considerable extent in the running direction of the paper web. Two felt belts 4 and 5 are passed through the press nip. In addition to the pressing elements 1, 2 and 3, the two press belts loop around a series of internals. Thus, the lower felt belt 4 wraps around guide rollers 6, 7, and the upper felt belt 5 a suction take-off roller 8, a pipe suction device 9 and a guide roller 10. Further guide rollers are present, but not shown here. The suction guide roller 8 decreases from the wire section, namely from wire 11, the paper web brought up.

Die zweite Preßeinheit weist wiederum eine Preßwalze 1.1 auf, sowie ein mit dieser zusammenarbeitendes Preßelement, umfassend einen Preßschuh 2.1 und ein den Preßschuh umschlingendes, umlaufendes Preßband 3.1. Im Gegensatz zur ersten Preßeinheit, die doppelt befilzt ist, weist die zweite Preßeinheit nur ein einziges Filzband auf, nämlich den Unterfilz 12.The second press unit in turn has a press roll 1.1, and a press element cooperating with it, comprising a press shoe 2.1 and a rotating press belt 3.1 wrapping around the press shoe. In contrast to the first press unit, which is double felted, the second press unit has only a single felt belt, namely the bottom felt 12.

An die zweite Preßeinheit schließt sich die Trockenpartie an, von welcher man hier nur eine Leitwalze 20 und ein Trockensieb 21 sieht. Die Papierbahn wird von der Preßwalze 1.1 auf das Trockensieb 21 überführt.The drying section adjoins the second press unit, of which only a guide roller 20 and a drying wire 21 can be seen here. The paper web is transferred from the press roller 1.1 to the drying wire 21.

Besonders wichtig für die Durchführung der Erfindung ist die Tatsache, daß wenigstens die beiden - in Laufrichtung der Papierbahn gesehen - letzten Leitwalzen 7 und 10, in dieser Anmeldung "Überführwalzen" genannt, in Richtung der Pfeile B und C verfahrbar sind. Die Verfahrbarkeit kann in der Praxis ausgeführt sein in Gestalt von Führungsschienen, die in Richtung der Pfeile B und C verlaufen, und auf welchen Lagerungen der beiden Überführwalzen verschiebbar sind, oder mittels Schwenkhebeln. Zur Erleichterung der Überführung ist an der Preßwalze 1.1 ein Überführschaber 1.5 vorgesehen.Particularly important for the implementation of the invention is the fact that at least the two last guide rollers 7 and 10, viewed in the direction of travel of the paper web, called "transfer rollers" in this application, can be moved in the direction of arrows B and C. The movability can be carried out in practice in the form of guide rails, which run in the direction of arrows B and C, and on which bearings of the two transfer rollers can be moved, or by means of swivel levers. To facilitate the transfer, a transfer scraper 1.5 is provided on the press roller 1.1.

Die drei Figuren stellen im einzelnen folgende Betriebszustände dar:

Fig. 1
veranschaulicht die Phase vor dem Anfahren der Papiermaschine, z. B. die erste Phase nach dem Abstellen der Papiermaschine, beispielsweise nach einer vorausgegangenen Wartung, nach einem Siebwechsel, oder nach einem Filzwechsel.
The three figures represent the following operating states:
Fig. 1
illustrates the phase before starting the paper machine, e.g. B. the first phase after turning off the paper machine, for example after a previous maintenance, after a screen change, or after a felt change.

Die eine der beiden Umlenkwalzen dieser ersten Preßeinheit, nämlich die Umlenkwalze 10, ist jetzt in Pfeilrichtung C abgefahren, so daß keine Verbindung zwischen den beiden Preßeinheiten über die Filze besteht. Rohrsauger 9 hat eine ablaufende Kante, die gerundet ist. Deshalb kann Umlenkwalze 10 derart weit nach oben verfahren werden, daß Oberfilz 5 dort einen kleinen Knick macht. Beide Preßeinheiten können nunmehr unabhängig voneinander laufen. Nach dem Einzug neuer Filze kann dies für eine gewisse Zeitspanne erforderlich sein, aber auch zum Reinigen der Filze.One of the two deflecting rollers of this first press unit, namely the deflecting roller 10, has now moved in the direction of arrow C, so that there is no connection between the two press units via the felts. Pipe suction device 9 has a running edge that is rounded. Therefore deflection roller 10 can be moved so far up that top felt 5 makes a small kink there. Both press units can now run independently of one another. After new felts have been drawn in, this may be necessary for a certain period of time, but also for cleaning the felts.

Ab einem bestimmten Zeitpunkt wird Papierstoffsuspension auf das Sieb 11 durch einen hier nicht gezeigten Stoffauflauf aufgegeben. Dann erfolgt das Weiterführen der Bahn. Hierbei wird entweder nur ein schmaler Überführstreifen aufgeführt , oder die gesamte Papierbahn. Dann laufen die Überführstreifen oder die Papierbahn automatisch zu der der ersten Preßeinheit nachgeschalteten Einheit, also z. B. einer weiteren Preßeinheit.From a certain point in time, paper stock suspension is applied to the screen 11 through a headbox, not shown here. Then the path continues. Here either only a narrow transfer strip is listed, or the entire paper web. Then the transfer strips or the paper web automatically run to the unit downstream of the first press unit, that is to say e.g. B. another press unit.

Vor Überführen des Überführstreifens oder der Bahn von der ersten Preßeinheit auf die zweite Preßeinheit werden die beiden Umlenkwalzen 7 und 10 in solche Positionen verbracht, daß die beiden Filzbänder 4 und 5 so lange wie möglich parallel laufen. Dies ist jene Ebene, in welcher später die Papierbahn bei Normalbetrieb läuft. Diese Phase ist in Fig. 2 dargestellt. Wie man sieht, befindet sich Walze 7 in ihrer oberen Position (so wie bereits in Fig. 1 gezeigt), während Walze 10 abgesenkt ist, und zwar so weit, daß Filzband 5 nunmehr Unterfilz 12 der zweiten Preßeinheit berührt. Dies ist im Bereich einer Leitwalze 13 des Unterfilzes 12. Leitwalze 13 hat eine Saugzone 14. In dieser Phase ist das Rohrsaugervakuum offen, so daß der Rohrsauger 9 arbeitet und den Überführstreifen bzw. die Bahn am Oberfilz 5 hält.Before transferring the transfer strip or the web from the first press unit to the second press unit, the two deflecting rollers 7 and 10 are brought into such positions that the two felt belts 4 and 5 run in parallel for as long as possible. This is the level in which the paper web later runs in normal operation. This phase is shown in Fig. 2. As can be seen, roller 7 is in its upper position (as already shown in FIG. 1) while roller 10 is lowered, to the extent that felt belt 5 now touches bottom felt 12 of the second press unit. This is in the area of a guide roller 13 of the bottom felt 12. Guide roller 13 has a suction zone 14. In this phase, the pipe suction vacuum is open, so that the pipe suction device 9 works and holds the transfer strip or the web on the upper felt 5.

Wie man sieht, erfolgt die Überführung des Überführstreifens - und der Papierbahn - praktisch ohne Umlenkungen. Jedenfalls werden scharfe Umlenkungen mit kleinen Krümmungsradien vermieden. Auf gar keinen Fall ist eine S-förmige Umlenkung vorhanden. Die Überführung verläuft eher geradlinig.As you can see, the transfer of the transfer strip - and the paper web - takes place practically without deflections. In any case, sharp deflections with small radii of curvature are avoided. Under no circumstances is there an S-shaped deflection. The overpass is rather straight.

Fig. 3 veranschaulicht den normalen Betriebszustand. Der Überführstreifen wird zu irgendeinem Zeitpunkt auf die volle Breite der Bahn erweitert, so daß die Bahn in voller Breite durch die erste Preßeinheit, über die Überführstelle hinweg sowie durch die zweite Preßeinheit hindurchläuft. Nunmehr wird bei weiterhin angeschlossenem Rohrsaugervakuum die Walze 7 in Richtung des Pfeiles B abgesenkt. Der Rohrsauger verringert einerseits die Rückbefeuchtung der Papierbahn nach dem Durchlaufen des ersten Preßspaltes, andererseits verhindert er, daß die Bahn am Unterfilz 4 haften bleibt und mit diesem weiterläuft. Oberfilz 5 und Bahn laufen somit aus dem ersten Preßspalt aus.Fig. 3 illustrates the normal operating state. The transfer strip is expanded to the full width of the web at some point so that the full width of the web passes through the first press unit, over the transfer point and through the second press unit. Now, with the pipe suction vacuum still connected, the roller 7 is lowered in the direction of arrow B. The pipe suction device on the one hand reduces the rewetting of the paper web after passing through the first press nip, on the other hand it prevents the web from sticking to the bottom felt 4 and continuing to run with it. Upper felt 5 and web thus run out of the first press nip.

Im Normalbetrieb wird sodann das Vakuum am Rohrsauger 9 abgestellt, damit sich die Bahn nach der doppelt befilzten, ersten Preßeinheit längen kann.In normal operation, the vacuum on the pipe suction device 9 is then switched off so that the web can lengthen after the double felted, first press unit.

Claims (4)

  1. A press section for a paper machine having at least one press unit, and also a section following the press section, e.g. a second press unit or a drying section;
    1.1 the press unit comprises two press members, e.g. two rolls, or one roll (1) and a press shoe (2) having an associated press belt (3), which together form a press nip;
    1.2 around both press members (1; 2, 3) is wound a wire belt or felt belt (belt) (top felt belt 5 and lower felt belt 4);
    1.3 the belts (4, 5) are guided by guide rolls (6, 7, 8, 10);
    1.4 one of the guide rolls of each belt (4, 5) is a deflection roll (7, 10) connected after the press nip, which carries the respective belt (4, 5) away from the paper web, and the one deflection roll of which (first deflection roll 10) is a greater distance from the press nip than the other deflection roll (second deflection roll (7);
    1.5 the belt (transfer belt 5) of the first deflection roll (10) transfers the paper web to the following section;
    1.6 between the press nip of the first press unit and the first deflection roll (10) a pipe suction device (9) is provided inside the transfer belt (5);
    1.7 the following section also has a wire belt or a felt belt (12) (second belt);
    1.8 seen in top view transfer belt (5) and second belt (12) overlap;
    characterised by the following features:
    1.9 the two deflection rolls (10, 7) are mobile so that - seen in side view - they can be distanced from the paper web or can be moved closer thereto;
    1.10 the trailing edge of the pipe suction device (9) is rounded;
    1.11 the pipe suction device (9) can be moved into a non- operative position.
  2. A press section and also a following part according to Claim 1,
    characterised in that the passage of the web between the press unit and also the following part - seen in side view - is substantially rectilinear.
  3. A press section and also following part according to Claim 1 or 2,
    characterised in that the deflection rolls (7, 10) can be moved by means of swivel levers or guide rails (arrows B and C).
  4. A press section according to one of Claims 1 and 3,
    characterised in that at least one of the deflection rolls (7, 10) has circumferential grooves.
EP93112772A 1992-11-24 1993-08-10 Press section for a paper machine Expired - Lifetime EP0598991B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE9321098U DE9321098U1 (en) 1992-11-24 1993-08-10 Press section for a paper machine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4239360 1992-11-24
DE4239360 1992-11-24

Publications (2)

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EP0598991A1 EP0598991A1 (en) 1994-06-01
EP0598991B1 true EP0598991B1 (en) 1996-01-17

Family

ID=6473454

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EP93112772A Expired - Lifetime EP0598991B1 (en) 1992-11-24 1993-08-10 Press section for a paper machine

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EP (1) EP0598991B1 (en)
JP (1) JPH06220791A (en)
AT (1) ATE133217T1 (en)
CA (1) CA2109781A1 (en)
DE (1) DE59301463D1 (en)
FI (1) FI935201A (en)

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US6261415B1 (en) 1998-08-28 2001-07-17 Valmet Karlstad Ab Paper machine

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Publication number Priority date Publication date Assignee Title
EP0741820B1 (en) * 1993-12-20 1999-03-10 The Procter & Gamble Company Wet pressed paper web and method of making the same
US5795440A (en) * 1993-12-20 1998-08-18 The Procter & Gamble Company Method of making wet pressed tissue paper
US5776307A (en) * 1993-12-20 1998-07-07 The Procter & Gamble Company Method of making wet pressed tissue paper with felts having selected permeabilities
US5904811A (en) * 1993-12-20 1999-05-18 The Procter & Gamble Company Wet pressed paper web and method of making the same
US5861082A (en) * 1993-12-20 1999-01-19 The Procter & Gamble Company Wet pressed paper web and method of making the same
DE19511988C1 (en) * 1995-03-31 1996-08-01 Voith Sulzer Papiermasch Gmbh Paper mfg. press section for improved drainage and availability
US5830316A (en) * 1997-05-16 1998-11-03 The Procter & Gamble Company Method of wet pressing tissue paper with three felt layers
SE511667C2 (en) * 1998-03-16 1999-11-08 Valmet Karlstad Ab Paper machine and method for making a paper web
US6103062A (en) * 1998-10-01 2000-08-15 The Procter & Gamble Company Method of wet pressing tissue paper
WO2000071813A1 (en) * 1999-05-21 2000-11-30 Valmet-Karlstad Ab Press section with web stabilizing device
WO2000071812A1 (en) * 1999-05-21 2000-11-30 Valmet-Karlstad Ab Press section with web stabilizing device
DE19963285A1 (en) * 1999-12-27 2001-06-28 Valmet Corp Reliable device for temporary diversion of paper web, for press section of papermaking machine support conveyor, comprises rotary guide roller with suction zone, moving between two positions
JP2004169245A (en) * 2002-11-22 2004-06-17 Mitsubishi Heavy Ind Ltd Shoe press for paper-making machine and press device for paper-making machine
DE102018119686A1 (en) * 2018-08-14 2020-02-20 Voith Patent Gmbh paper machine

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FI81854C (en) * 1982-09-15 1990-12-10 Valmet Oy PRESS SPRING WITH PRESS SHEET I EN PAPER MACHINERY.
DE3708191A1 (en) * 1987-03-13 1988-09-22 Voith Gmbh J M WET PRESS
WO1991008339A1 (en) * 1989-11-27 1991-06-13 Beloit Corporation A press section apparatus
DE4026021C2 (en) * 1990-08-17 1995-10-12 Voith Gmbh J M Press section of a paper machine
FI96789C (en) * 1990-11-23 1996-08-26 Valmet Paper Machinery Inc Method and apparatus for dewatering a paper web by pressing

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Publication number Priority date Publication date Assignee Title
US6261415B1 (en) 1998-08-28 2001-07-17 Valmet Karlstad Ab Paper machine

Also Published As

Publication number Publication date
CA2109781A1 (en) 1994-05-25
DE59301463D1 (en) 1996-02-29
ATE133217T1 (en) 1996-02-15
JPH06220791A (en) 1994-08-09
FI935201A0 (en) 1993-11-23
FI935201A (en) 1994-05-25
EP0598991A1 (en) 1994-06-01

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