EP0930392B1 - Press section - Google Patents

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Publication number
EP0930392B1
EP0930392B1 EP98121011A EP98121011A EP0930392B1 EP 0930392 B1 EP0930392 B1 EP 0930392B1 EP 98121011 A EP98121011 A EP 98121011A EP 98121011 A EP98121011 A EP 98121011A EP 0930392 B1 EP0930392 B1 EP 0930392B1
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EP
European Patent Office
Prior art keywords
press
fibrous web
web
roll
dewatering felt
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 - Lifetime
Application number
EP98121011A
Other languages
German (de)
French (fr)
Other versions
EP0930392A2 (en
EP0930392A3 (en
Inventor
Wolfgang Mayer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Paper Patent GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP0930392A2 publication Critical patent/EP0930392A2/en
Publication of EP0930392A3 publication Critical patent/EP0930392A3/en
Application granted granted Critical
Publication of EP0930392B1 publication Critical patent/EP0930392B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the invention relates to a press section of a machine for producing a Fiber web, in particular a paper and / or board web with at least two consecutive, double-felted presses accordingly the preamble of claim 1.
  • the object of the invention is therefore a simply constructed press section with improved dewatering in the first or upstream press nip create.
  • the shoe press rolls are generally of a flexible press cover formed, which runs over a pressing member with concave pressing surface. This allows the formation of an extended press nip with a cylindrical Counter roll, so that the fibrous web in the nip over a longer distance exposed to the pressing pressure and thus dehydrated internsiver. In addition, sets the pressure in the press nip no longer abruptly, this can rather of a low value, for example, continuously brought to a higher value become.
  • the arranged on both sides of the fibrous web dewatering felts provide not only for a sufficient capacity to accommodate the squeezed out Water but also for the uniformity of the fibrous web. Furthermore, By the use of an evacuated roll at the upstream or first nip the capacity for the squeezed out water essential increased.
  • the fibrous web starting from the takeover from an upstream to the Transfer to a following unit at least from a band, sieve, felt o. ⁇ . is supported. This leads to a secure web guide and thereby reduces the frequency of web breaks.
  • the dewatering performance of the press section can also be essential be improved if the following in the web running direction, double felted Press nip at least of a deflection-controlled roller preferably is formed in the form of a shoe roll. This allows the press section to limit to two press nips, which significantly reduces the effort.
  • the leadership of the fibrous web can in each case a dewatering felt be taken over the press column. It is particularly advantageous in this Fall, when a dewatering felt of the first press the fibrous web of the upstream wire section and on the other side of the fibrous web arranged dewatering felt the following press the fibrous web from the dewatering felt of the first press and to the following Drying section passes
  • the figure shows a schematic representation the press section with two press nips 5 and 9. It is about the rollers each press nip 5 and 9 each an endless dewatering felt 11, 12 out, which serves to receive the squeezed out water. Besides, both own Presses 2 and 3 each a deflection-controlled shoe roll 6 and 10. While the press nip 5 of the upstream in the running direction 4 press 2 with a cylindrical suctioned roller 15 is formed, this is done in the following Press 3 with a cylindrical smooth roller 16.
  • the deflection-controlled shoe rollers 6 and 10 provide for a adjustable, preferably uniform drainage profile axially along each press nip 5 and 9.
  • a dewatering felts 11, 12 in each press nip 5 and 9 is a sufficiently large capacity given for receiving the squeezed out water.
  • the Fibrous web 1 each of a dewatering felt 11, 12 supported by the Press section are performed.
  • the evacuated roll 15 has a perforated roll shell whose interior connected to a vacuum source.
  • the negative pressure does not only provide for a safe guidance of the fibrous web 1 after leaving the first Press nip 5 on the dewatering felt 11 but also for a reduced Remoistening of the fibrous web 1 by the dewatering felt 11th
  • the fibrous web 1 directly removed from the sieve 13 of an upstream unit 7. , This is done with the aid of an evacuated guide roll, the dewatering felt 11th the evacuated roller 15 of the first press 2 is looped. After the first Pressing gap 9 is in turn supported by an evacuated guide roll Fiber web 1 at the arranged on the other side of the fibrous web 1 Dewatering felt 12 passed. This smooth roller 16 revolving Dewatering felt 12 transfers the fibrous web 1 in turn from one The suctioned guide roll supports a drying wire 14 of the following unit 8. This unit 8 is designed here as a dryer section, in which the fibrous web 1 together with the drying wire 14 alternately over drying cylinder and Guide rollers is guided.

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  • Paper (AREA)

Description

Die Erfindung betrifft eine Pressenpartie einer Maschine zur Herstellung einer Faserstoffbahn, insbesondere einer Papier- und/oder Kartonbahn mit wenigstens zwei aufeinander folgenden, doppelt befilzten Pressen entsprechend dem Oberbegriff des Anspruchs 1.The invention relates to a press section of a machine for producing a Fiber web, in particular a paper and / or board web with at least two consecutive, double-felted presses accordingly the preamble of claim 1.

Derartige Presenpartien sind bekannt und dienen zur Entwässerung der Faserstoffbahnen (DE-U-29701948). Die Schuhpressen bilden dabei eine konkave Anpreßfläche, die es erlaubt, mit einer zylindrischen Gegenwalze einen verlängerten Preßspalt zu bilden. Derartige Preßspalte können die Entwässerungsleistung erheblich verbessem.Such Presenpartien are known and are used for dewatering the fibrous webs (DE-U-29701948). The shoe presses form a concave contact surface, which it allowed, with a cylindrical counter roll to an extended press nip form. Such press nips can significantly improve the drainage performance.

Probleme ergeben sich jedoch wegen des hohen Wassergehaltes der Faserstoffbahn bei der Abführung des ausgepreßten Wassers im ersten bzw. vorgelagerten Preßspalt.Problems arise, however, because of the high water content of the fibrous web in the discharge of the squeezed out water in the first or upstream Nip.

Die Aufgabe der Erfindung ist es daher, eine einfach aufgebaute Pressenpartie mit verbesserter Entwässerung im ersten bzw. vorgelagerten Preßspalt zu schaffen.The object of the invention is therefore a simply constructed press section with improved dewatering in the first or upstream press nip create.

Erfindungsgemäß wurde die Aufgabe durch die im Kennzeichen des Anspruchs 1 angegebenen Merkmale gelöst.According to the task was achieved by solved specified in the characterizing part of claim 1 features.

Die Schuhpreßwalzen werden dabei im allgemeinen von einem flexiblen Preßmantel gebildet, der über ein Preßelement mit konkaver Anpreßfläche läuft. Dies erlaubt die Bildung eines verlängerten Preßspaltes mit einer zylindrischen Gegenwalze, so daß die Faserstoffbahn im Preßspalt über eine längere Strecke dem Preßdruck ausgesetzt und damit internsiver entwässert wird. Zudem setzt der Druck im Preßspalt nicht mehr schlagartig ein, dieser kann vielmehr von einem niedrigen Wert beispielsweise kontinuierlich auf einen höheren Wert gebracht werden.The shoe press rolls are generally of a flexible press cover formed, which runs over a pressing member with concave pressing surface. This allows the formation of an extended press nip with a cylindrical Counter roll, so that the fibrous web in the nip over a longer distance exposed to the pressing pressure and thus dehydrated internsiver. In addition, sets the pressure in the press nip no longer abruptly, this can rather of a low value, for example, continuously brought to a higher value become.

Die beidseitig der Faserstoffbahn angeordneten Entwässerungsfilze sorgen dabei nicht nur für eine ausreichende Kapazität zur Aufnahme des ausgepreßten Wassers sondern auch für die Gleichseitigkeit der Faserstoffbahn. Außerdem wird durch die Verwendung einer besaugten Walze beim vorgelagerten bzw. ersten Preßspalt die Aufnahmefähigkeit für das ausgepreßte Wasser wesentlich gesteigert.The arranged on both sides of the fibrous web dewatering felts provide not only for a sufficient capacity to accommodate the squeezed out Water but also for the uniformity of the fibrous web. Furthermore By the use of an evacuated roll at the upstream or first nip the capacity for the squeezed out water essential increased.

Insbesondere bei hohen Geschwindigkeiten ist es von Vorteil, wenn die Faserstoffbahn ausgehend von der Übernahme von einer vorgelagerten bis zur Übergabe an eine folgende Einheit zumindest von einem Band, Sieb, Filz o. ä. gestützt ist. Dies führt zu einer sicheren Bahnführung und vermindert dadurch die Häufigkeit von Bahnabrissen.Especially at high speeds, it is advantageous if the fibrous web starting from the takeover from an upstream to the Transfer to a following unit at least from a band, sieve, felt o. Ä. is supported. This leads to a secure web guide and thereby reduces the frequency of web breaks.

Die Entwässerungsleistung der Pressenpartie kann außerdem noch wesentlich verbessert werden, wenn der in Bahnlaufrichtung folgende, doppelt befilzte Preßspalt zumindest von einer durchbiegungsgesteuerten Walze vorzugsweise in Form einer Schuhwalze gebildet wird. Dies ermöglicht es, die Pressenpartie auf zwei Preßspalte zu begrenzen, was den Aufwand erheblich reduziert.The dewatering performance of the press section can also be essential be improved if the following in the web running direction, double felted Press nip at least of a deflection-controlled roller preferably is formed in the form of a shoe roll. This allows the press section to limit to two press nips, which significantly reduces the effort.

Die Führung der Faserstoffbahn kann dabei von jeweils einem Entwässerungsfilz der Preßspalte übernommen werden. Besonders vorteilhaft ist es in diesem Fall, wenn ein Entwässerungsfilz der ersten Presse die Faserstoffbahn von der vorgelagerten Siebpartie übernimmt und der auf der anderen Seite der Faserstoffbahn angeordnete Entwässerungsfilz der folgenden Presse die Faserstoffbahn von dem Entwässerungsfilz der ersten Presse übernimmt und an die folgende Trockenpartie übergibtThe leadership of the fibrous web can in each case a dewatering felt be taken over the press column. It is particularly advantageous in this Fall, when a dewatering felt of the first press the fibrous web of the upstream wire section and on the other side of the fibrous web arranged dewatering felt the following press the fibrous web from the dewatering felt of the first press and to the following Drying section passes

Zur Gewährleistung einer sicheren Bahnführung sowie einer Verringerung der Rückbefeuchtung des Preßspaltes ist es des weiteren von Vorteil, wenn der die Faserstoffbahn führende Entwässerungsfilz der ersten Presse um die besaugte Walze läuft.To ensure a safe web guide and a reduction of Remoistening of the press nip, it is also advantageous if the the Fibrous web leading dewatering felt of the first press around the vacuumed Roller is running.

Nachfolgend soll die Erfindung an einem Ausführungsbeispiel näher erläutert werden. In der beigefügten Zeichnung zeigt die Figur eine schematische Darstellung der Pressenpartie mit zwei Preßspalten 5 und 9. Dabei ist um die Walzen jedes Preßspaltes 5 und 9 je ein endloser Entwässerungsfilz 11, 12 geführt, der zur Aufnahme des ausgepreßten Wassers dient. Außerdem besitzen beide Pressen 2 und 3 je eine durchbiegungsgesteuerte Schuhwalze 6 und 10. Während der Preßspalt 5 der in Bahnlaufrichtung 4 vorgelagerten Presse 2 mit einer zylindrischen besaugten Walze 15 gebildet wird, erfolgt dies in der folgenden Presse 3 mit einer zylindrischen glatten Walze 16.The invention will be explained in more detail with reference to an exemplary embodiment become. In the accompanying drawing, the figure shows a schematic representation the press section with two press nips 5 and 9. It is about the rollers each press nip 5 and 9 each an endless dewatering felt 11, 12 out, which serves to receive the squeezed out water. Besides, both own Presses 2 and 3 each a deflection-controlled shoe roll 6 and 10. While the press nip 5 of the upstream in the running direction 4 press 2 with a cylindrical suctioned roller 15 is formed, this is done in the following Press 3 with a cylindrical smooth roller 16.

Die durchbiegungsgesteuerten Schuhwalzen 6 und 10 sorgen dabei für ein einstellbares, vorzugsweise gleichmäßiges Entwässerungsprofil axial entlang jedes Preßspaltes 5 und 9. Durch die Verwendung von jeweils zwei Entwässerungsfilzen 11, 12 in jedem Preßspalt 5 und 9 ist eine ausreichend große Kapazität zur Aufnahme des ausgepreßten Wassers gegeben. Außerdem kann die Faserstoffbahn 1 von jeweils einem Entwässerungsfilz 11, 12 gestützt durch die Pressenpartie geführt werden. The deflection-controlled shoe rollers 6 and 10 provide for a adjustable, preferably uniform drainage profile axially along each press nip 5 and 9. By the use of two dewatering felts 11, 12 in each press nip 5 and 9 is a sufficiently large capacity given for receiving the squeezed out water. In addition, the Fibrous web 1 each of a dewatering felt 11, 12 supported by the Press section are performed.

Die besaugte Walze 15 besitzt einen perforierten Walzenmantel, dessen Innenraum mit einer Vakuumquelle verbunden ist. Der Unterdruck sorgt nicht nur für eine sichere Führung der Faserstoffbahn 1 nach dem Verlassen des ersten Preßspaltes 5 am Entwässerungsfilz 11 sondern auch für eine verringerte Rückbefeuchtung der Faserstoffbahn 1 durch den Entwässerungsfilz 11.The evacuated roll 15 has a perforated roll shell whose interior connected to a vacuum source. The negative pressure does not only provide for a safe guidance of the fibrous web 1 after leaving the first Press nip 5 on the dewatering felt 11 but also for a reduced Remoistening of the fibrous web 1 by the dewatering felt 11th

Um eine sichere Führung der Faserstoffbahn 1 zu gewährleisten, wird die Faserstoffbahn 1 vom Sieb 13 einer vorgelagerten Einheit 7 direkt abgenommen. . Dies erfolgt mit Hilfe einer besaugten Leitwalze, die vom Entwässerungsfilz 11 der besaugten Walze 15 der ersten Presse 2 umschlungen ist. Nach dem ersten Preßspalt 9 wird wiederum von einer besaugten Leitwalze unterstützt die Faserstoffbahn 1 an den auf der anderen Seite der Faserstoffbahn 1 angeordneten Entwässerungsfilz 12 übergeben. Dieser die glatte Walze 16 umlaufende Entwässerungsfilz 12 übergibt die Faserstoffbahn 1 wiederum von einer besaugten Leitwalze unterstützt an ein Trockensieb 14 der folgenden Einheit 8. Diese Einheit 8 ist hier als Trockenpartie ausgeführt, in der die Faserstoffbahn 1 gemeinsam mit dem Trockensieb 14 abwechselnd über Trockenzylinder und Leitwalzen geführt wird.To ensure safe guidance of the fibrous web 1, the fibrous web 1 directly removed from the sieve 13 of an upstream unit 7. , This is done with the aid of an evacuated guide roll, the dewatering felt 11th the evacuated roller 15 of the first press 2 is looped. After the first Pressing gap 9 is in turn supported by an evacuated guide roll Fiber web 1 at the arranged on the other side of the fibrous web 1 Dewatering felt 12 passed. This smooth roller 16 revolving Dewatering felt 12 transfers the fibrous web 1 in turn from one The suctioned guide roll supports a drying wire 14 of the following unit 8. This unit 8 is designed here as a dryer section, in which the fibrous web 1 together with the drying wire 14 alternately over drying cylinder and Guide rollers is guided.

Claims (3)

  1. Press section for a machine for producing a fibrous web (1), in particular a paper and/or board web, having two double-felted presses (2; 3) which follow each other, the press nip (5) of the press (2) that is upstream in the web running direction (4) being formed by a controlled deflection shoe roll (6) and an evacuated roll (15), and the fibrous web (1) running through the press section while supported by at least one dewatering felt (11; 12), characterized in that a dewatering felt (11) of the first press accepts the fibrous web (1) from the wire section arranged upstream, and the dewatering felt (12) of the following press (3), arranged on the other side of the fibrous web (1), accepts the fibrous web (1) from the dewatering felt (11) of the first press (2) and transfers it to the following dryer section, the dewatering felt (11) belonging to the first press (2) and carrying the fibrous web (1) running around the evacuated roll (15).
  2. Press section according to Claim 1, characterized in that, starting from the acceptance from an upstream (7) unit as far as the transfer to a following (8) unit, the fibrous web (1} is supported at least by a belt, fabric, felt or the like.
  3. Press section according to one of the preceding claims, characterized in that the double-felted press nip (9) following in the web running direction (4) is formed at least by a controlled deflection roll, preferably in the form of a shoe roll (10).
EP98121011A 1998-01-20 1998-11-05 Press section Expired - Lifetime EP0930392B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19801891 1998-01-20
DE19801891A DE19801891A1 (en) 1998-01-20 1998-01-20 Press section

Publications (3)

Publication Number Publication Date
EP0930392A2 EP0930392A2 (en) 1999-07-21
EP0930392A3 EP0930392A3 (en) 2001-01-10
EP0930392B1 true EP0930392B1 (en) 2005-02-02

Family

ID=7855089

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98121011A Expired - Lifetime EP0930392B1 (en) 1998-01-20 1998-11-05 Press section

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US (1) US6589390B1 (en)
EP (1) EP0930392B1 (en)
CA (1) CA2260115A1 (en)
DE (2) DE19801891A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE511667C2 (en) † 1998-03-16 1999-11-08 Valmet Karlstad Ab Paper machine and method for making a paper web
DE10022605A1 (en) * 2000-05-09 2001-11-15 Voith Paper Patent Gmbh Web press section for the production of paper/cardboard/tissue has at least two roller press gaps in succession with structured continuous blanket belts and travel paths to prevent extracted water returning to the web
DE10234959A1 (en) * 2002-07-31 2004-02-19 Voith Paper Patent Gmbh Press arrangement

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5389205A (en) 1990-11-23 1995-02-14 Valmet Paper Machinery, Inc. Method for dewatering of a paper web by pressing using an extended nip shoe pre-press zone on the forming wire
FI96789C (en) * 1990-11-23 1996-08-26 Valmet Paper Machinery Inc Method and apparatus for dewatering a paper web by pressing
US5868904A (en) * 1993-12-08 1999-02-09 Valmet Corporation Press section employing an extended nip press with suction counter roll
FI114227B (en) * 1995-04-24 2004-09-15 Metso Paper Inc Paper machine with press section and dryer section
FI98843C (en) * 1995-10-03 1997-08-25 Valmet Corp A method and apparatus for removing water from a paper or board web by compression
DE19607868A1 (en) * 1996-03-01 1997-09-04 Voith Sulzer Papiermasch Gmbh Press section of a papermaking machine
DE29701382U1 (en) 1997-01-28 1997-03-20 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Press section of a paper machine
DE19708967A1 (en) * 1997-03-05 1998-09-10 Voith Sulzer Papiermasch Gmbh Papermaking machine press section

Also Published As

Publication number Publication date
DE59812539D1 (en) 2005-03-10
US6589390B1 (en) 2003-07-08
EP0930392A2 (en) 1999-07-21
EP0930392A3 (en) 2001-01-10
CA2260115A1 (en) 1999-07-20
DE19801891A1 (en) 1999-07-22

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