EP1422339B1 - Arrangement for transfering a fibrous web - Google Patents

Arrangement for transfering a fibrous web Download PDF

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Publication number
EP1422339B1
EP1422339B1 EP03102415A EP03102415A EP1422339B1 EP 1422339 B1 EP1422339 B1 EP 1422339B1 EP 03102415 A EP03102415 A EP 03102415A EP 03102415 A EP03102415 A EP 03102415A EP 1422339 B1 EP1422339 B1 EP 1422339B1
Authority
EP
European Patent Office
Prior art keywords
transfer
belt
fibrous web
web
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 - Lifetime
Application number
EP03102415A
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German (de)
French (fr)
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EP1422339A1 (en
Inventor
Joachim Dr. Grabscheid
Thomas RÜHL
Oswald Satzger
Georg Dr. Kleiser
Per-Ola Lidar
Thomas Augscheller
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Voith Patent GmbH
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Voith Patent GmbH
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Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1422339A1 publication Critical patent/EP1422339A1/en
Application granted granted Critical
Publication of EP1422339B1 publication Critical patent/EP1422339B1/en
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F2/00—Transferring webs from wet ends to press sections
    • 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 an arrangement for transferring a paper, cardboard, tissue or another fibrous web from an endlessly circulating, permeable belt to an endlessly circulating, impermeable belt in a machine for producing and / or finishing a fibrous web, according to the preamble of Claim 1.
  • Such an arrangement is from the document WO-A-0 070 142 known.
  • Impermeable tapes are increasingly used in press sections of paper machines to improve web guiding.
  • the object of the invention is therefore to make this transfer safer with relatively simple means.
  • the smooth surface of the impermeable belt forms the basis for the adhesion of the fibrous web to this, wherein the contact pressure in the transfer area, the formation of sufficiently large adhesive forces reinforced.
  • the smooth surface also prevents deterioration of the surface of the fibrous web during the pressing.
  • the pressure can be realized in a particularly simple manner by pressing the belts against one another by two rollers forming a transfer gap.
  • the pressure during the transfer should be relatively small.
  • the line force in the transfer gap should be a maximum of 20 KN / m, so that it does not come to dewatering of the fibrous web.
  • the line force in the transfer gap should be at least 5 KN / m.
  • the safety of the transfer of the fibrous web can be further improved by the permeable belt looping around the impermeable belt in contact with the transfer nip at least 4 ° or at least 25 mm.
  • This wrap around lengthens the contact time between the impermeable belt and the fibrous web to the removal of the permeable belt. This extended contact time also supports the development of the adhesive forces.
  • a simple and compact pressing arrangement results if the fibrous web passes before the transfer, preferably together with the permeable band through a press nip for dewatering.
  • the fibrous web passes after the transfer together with the impermeable belt through a press or Glättspalt formed by two press rolls.
  • the fibrous web passes after the transfer together with the impermeable belt and an opposite, preferably water-absorbing band through the following press nip. In this Pressing gap then it comes to a one-sided drainage to the water-absorbing tape out.
  • the fibrous web 1 passes through together with both sides a water-absorbing, permeable tape 3.7 in the form of an endless revolving press felt, formed by two press rolls 5, first press nip the press section for dewatering the fibrous web 1. Then wraps around the lower band 3 a suctioned guide roller 10, the negative pressure of which the adhesion of the fibrous web 1 on this permeable band 3 so far reinforced that the upper band 7 can be easily carried away from the fibrous web 1.
  • the fibrous web 1 alone leading permeable belt 3, the fibrous web 1 is passed to a following, endlessly circulating, impermeable and smooth belt 2.
  • the two belts 2, 3 are pressed against each other during the transfer of two rollers 4.
  • this transfer nip there is a line force between 5 and 20 KN / m, which is sufficient to develop the adhesion of the fibrous web 1 on the smooth, impermeable belt 2 to a sufficient extent, but without causing dehydration.
  • the permeable belt 3 wraps around the roller 4 coming into contact with the impermeable belt 2 after the transfer gap still about 4 to 8 °. This also promotes the adhesion of the fibrous web 1 on the impermeable belt 2. Regardless of the roll diameter, the Nachumschlingung of the roller 4 should be between 25 and 75 mm.
  • This Nachumschlingung can be adjusted via a guide roller 11 of the permeable belt 3 and also changed.
  • the fibrous web 1 is guided from the top, impermeable belt 2 alone to a smoothing or press nip formed by two press rollers 6.
  • the fibrous web 1 passes after passing together with the impermeable, smooth belt 2 through a smoothing nip, wherein the belt 2 and the lower press roller 6 form the smoothing surfaces. After the smoothing nip, the fibrous web 1 is transferred from the lower, smooth pressing roller 6 to a following belt 9.
  • the fibrous web 1 runs according to FIG. 2 together with the impermeable belt 2 and a running on the opposite side, endless and water-absorbing belt 8 through a press nip for drainage.
  • the lower, air-permeable belt 8 wraps around an evacuated guide roller 12, the impermeable belt 2 can be led away from the fibrous web 1 after the press nip.

Abstract

At a papermaking machine, or a machine for the production of cardboard or tissue, where the web (1) is transferred from a continuous permeable belt (3) to a continuous impermeable belt (2) the belts are pressed together at the transfer point. The impermeable belt has a smooth surface on the side towards the web. The belts are pressed together by rollers (4), to give a linear force in the transfer gap between them of a maximum of 20 KN/m. After transfer, the web together with the impermeable belt pass through a press or polishing gap between two press rollers (6).

Description

Die Erfindung betrifft eine Anordnung zur Übergabe einer Papier-, Karton-, Tissue- oder einer anderen Faserstoffbahn von einem endlos umlaufenden, permeablen Band an ein endlos umlaufendes, impermeables Band in einer Maschine zur Herstellung und/oder Veredlung einer Faserstoffbahn, gemäß dem Oberbegriff des Anspruchs 1. Eine solche Anordnung ist aus dem Dokument WO-A-0 070 142 bekannt.The invention relates to an arrangement for transferring a paper, cardboard, tissue or another fibrous web from an endlessly circulating, permeable belt to an endlessly circulating, impermeable belt in a machine for producing and / or finishing a fibrous web, according to the preamble of Claim 1. Such an arrangement is from the document WO-A-0 070 142 known.

Impermeable Bänder werden zunehmend in Pressenpartien von Papiermaschinen eingesetzt, um so die Bahnführung zu verbessern.Impermeable tapes are increasingly used in press sections of paper machines to improve web guiding.

Dabei bereitet jedoch die sichere Übergabe der Faserstoffbahn an das impermeable Band, insbesondere von einem permeablen Band aus, erhebliche Probleme.However, the safe transfer of the fibrous web to the impermeable belt, in particular from a permeable belt, presents considerable problems.

Die Aufgabe der Erfindung ist es daher diese Übergabe mit relativ einfachen Mitteln sicherer zu gestalten.The object of the invention is therefore to make this transfer safer with relatively simple means.

Erfindungsgemäß wurde die Aufgabe durch die Merkmale des kennzeichnenden Teils des Anspruchs 1 gelöst.According to the invention the object has been solved by the features of the characterizing part of claim 1.

Die glatte Oberfläche des impermeablen Bandes bildet die Grundlage für das Haften der Faserstoffbahn an diesem, wobei die Anpressung im Übergabebereich die Herausbildung ausreichend großer Haftkräfte noch verstärkt.The smooth surface of the impermeable belt forms the basis for the adhesion of the fibrous web to this, wherein the contact pressure in the transfer area, the formation of sufficiently large adhesive forces reinforced.

Die glatte Oberfläche verhindert außerdem eine Beeinträchtigung der Oberfläche der Faserstoffbahn während der Pressung.The smooth surface also prevents deterioration of the surface of the fibrous web during the pressing.

Besonders einfach kann die Pressung dadurch realisiert werden, dass die Bänder von zwei, einen Übergabespalt bildenden Walzen gegeneinander gepresst werden.The pressure can be realized in a particularly simple manner by pressing the belts against one another by two rollers forming a transfer gap.

Um dabei den Aufwand für diese Walzenanordnung zu minimieren, sollte der Pressdruck während der Übergabe relativ klein sein. Vorzugsweise sollte die Linienkraft im Übergabespalt maximal 20 KN/m betragen, so dass es nicht zur Entwässerung der Faserstoffbahn kommt.In order to minimize the effort for this roller assembly, the pressure during the transfer should be relatively small. Preferably, the line force in the transfer gap should be a maximum of 20 KN / m, so that it does not come to dewatering of the fibrous web.

Zur Herausbildung ausreichender Haftkräfte sollte die Linienkraft im Übergabespalt jedoch mindestens 5 KN/m betragen.However, in order to develop sufficient adhesive forces, the line force in the transfer gap should be at least 5 KN / m.

Die Sicherheit der Übergabe der Faserstoffbahn kann noch dadurch verbessert werden, dass das permeable Band die mit dem impermeablen Band in Kontakt stehende Walze nach dem Übergabespalt mit mindestens 4 ° oder zumindest 25 mm umschlingt. Diese Nachumschlingung verlängert die Kontaktzeit zwischen dem impermeablen Band und der Faserstoffbahn bis zur Wegführung des permeablen Bandes. Auch diese verlängerte Kontaktzeit unterstützt die Herausbildung der Haftkräfte.The safety of the transfer of the fibrous web can be further improved by the permeable belt looping around the impermeable belt in contact with the transfer nip at least 4 ° or at least 25 mm. This wrap around lengthens the contact time between the impermeable belt and the fibrous web to the removal of the permeable belt. This extended contact time also supports the development of the adhesive forces.

Eine einfache und kompakte Pressanordnung ergibt sich, wenn die Faserstoffbahn vor der Übergabe, vorzugsweise gemeinsam mit dem permeablen Band durch einen Pressspalt zur Entwässerung läuft.A simple and compact pressing arrangement results if the fibrous web passes before the transfer, preferably together with the permeable band through a press nip for dewatering.

Außerdem ist vorgesehen, daß die Faserstoffbahn nach der Übergabe gemeinsam mit dem impermeablen Band durch einen von zwei Presswalzen gebildeten Press- oder Glättspalt läuft.In addition, it is provided that the fibrous web passes after the transfer together with the impermeable belt through a press or Glättspalt formed by two press rolls.

Hierbei ist es möglich, dass die Faserstoffbahn im, auf die Übergabe folgenden Glättspalt mit einer glatten Presswalze in Kontakt kommt. Diese glatte Presswalze sowie das gegenüberliegende, glatte Band führen so zu einer zweiseitigen Glättung.In this case, it is possible for the fibrous web to come into contact with a smooth press roll in the nip following the transfer. This smooth press roller and the opposite, smooth band thus lead to a two-sided smoothing.

Es ist jedoch auch möglich, dass die Faserstoffbahn nach der Übergabe gemeinsam mit dem impermeablen Band und einem gegenüberliegenden, vorzugsweise wasseraufnehmenden Band durch den folgenden Pressspalt läuft. In diesem Pressspalt kommt es dann zu einer einseitigen Entwässerung zum wasseraufnehmenden Band hin.However, it is also possible that the fibrous web passes after the transfer together with the impermeable belt and an opposite, preferably water-absorbing band through the following press nip. In this Pressing gap then it comes to a one-sided drainage to the water-absorbing tape out.

Nachfolgend soll die Erfindung an zwei Ausführungsbeispielen näher erläutert werden. In der beigefügten Zeichnung zeigt:

Figur 1:
eine schematische Darstellung einer Übergabeanordnung mit folgendem Glättspalt und
Figur 2:
eine Übergabeanordnung mit folgendem Pressspalt.
The invention will be explained in more detail below with reference to two exemplary embodiments. In the attached drawing shows:
FIG. 1:
a schematic representation of a transfer arrangement with the following smoothing gap and
FIG. 2:
a transfer arrangement with the following press nip.

In beiden Fällen durchläuft die Faserstoffbahn 1 gemeinsam mit beidseitig je einem wasseraufnehmenden, permeablen Band 3,7 in Form eines endlos umlaufenden Pressfilzes, den von zwei Presswalzen 5 gebildeten, ersten Pressspalt der Pressenpartie zur Entwässerung der Faserstoffbahn 1. Anschließend umschlingt das untere Band 3 eine besaugte Leitwalze 10, deren Unterdruck die Haftung der Faserstoffbahn 1 an diesem permeablen Band 3 soweit verstärkt, dass das obere Band 7 von der Faserstoffbahn 1 problemlos weggeführt werden kann.In both cases, the fibrous web 1 passes through together with both sides a water-absorbing, permeable tape 3.7 in the form of an endless revolving press felt, formed by two press rolls 5, first press nip the press section for dewatering the fibrous web 1. Then wraps around the lower band 3 a suctioned guide roller 10, the negative pressure of which the adhesion of the fibrous web 1 on this permeable band 3 so far reinforced that the upper band 7 can be easily carried away from the fibrous web 1.

Vom nunmehr die Faserstoffbahn 1 allein führenden, permeablen Band 3 wird die Faserstoffbahn 1 an ein folgendes, endlos umlaufendes, impermeables und glattes Band 2 übergeben.From now the fibrous web 1 alone leading permeable belt 3, the fibrous web 1 is passed to a following, endlessly circulating, impermeable and smooth belt 2.

Um diese Übergabe sicher zu gestalten, werden die beiden Bänder 2,3 während der Übergabe von zwei Walzen 4 gegeneinander gepresst. In diesem Übergabespalt herrscht eine Linienkraft zwischen 5 und 20 KN/m, was ausreicht, um die Haftung der Faserstoffbahn 1 am glatten, impermeablen Band 2 in genügendem Maß zu entwickeln, wobei jedoch keine Entwässerung herbeigeführt wird.In order to make this transfer safe, the two belts 2, 3 are pressed against each other during the transfer of two rollers 4. In this transfer nip there is a line force between 5 and 20 KN / m, which is sufficient to develop the adhesion of the fibrous web 1 on the smooth, impermeable belt 2 to a sufficient extent, but without causing dehydration.

Um die Kontaktzeit zwischen dem impermeablen Band 2 und der Faserstoffbahn 1 bis zum Wegführen des permeablen Bandes 3 zu verlängern, umschlingt das permeable Band 3 die mit dem impermeablen Band 2 in Kontakt kommende Walze 4 nach dem Übergabespalt noch um ca. 4 bis 8°. Auch dies fördert die Haftung der Faserstoffbahn 1 am impermeablen Band 2. Unabhängig vom Walzendurchmesser sollte die Nachumschlingung der Walze 4 zwischen 25 und 75 mm betragen.In order to extend the contact time between the impermeable belt 2 and the fibrous web 1 until the permeable belt 3 is carried away, the permeable belt 3 wraps around the roller 4 coming into contact with the impermeable belt 2 after the transfer gap still about 4 to 8 °. This also promotes the adhesion of the fibrous web 1 on the impermeable belt 2. Regardless of the roll diameter, the Nachumschlingung of the roller 4 should be between 25 and 75 mm.

Diese Nachumschlingung kann über eine Leitwalze 11 des permeablen Bandes 3 eingestellt und auch verändert werden.This Nachumschlingung can be adjusted via a guide roller 11 of the permeable belt 3 and also changed.

Nach der Übergabe wird die Faserstoffbahn 1 vom oben liegenden, impermeablen Band 2 allein zu einem, von zwei Presswalzen 6 gebildeten Glätt- oder Pressspalt geführt.After the transfer, the fibrous web 1 is guided from the top, impermeable belt 2 alone to a smoothing or press nip formed by two press rollers 6.

Wie in Figur 1 dargestellt, läuft die Faserstoffbahn 1 nach der Übergabe gemeinsam mit dem impermeablen, glatten Band 2 durch einen Glättspalt, wobei das Band 2 und die untere Presswalze 6 die Glättflächen bilden. Nach dem Glättspalt wird die Faserstoffbahn 1 von der unteren, glatten Presswalze 6 an ein folgendes Band 9 übergeben.As in FIG. 1 shown, the fibrous web 1 passes after passing together with the impermeable, smooth belt 2 through a smoothing nip, wherein the belt 2 and the lower press roller 6 form the smoothing surfaces. After the smoothing nip, the fibrous web 1 is transferred from the lower, smooth pressing roller 6 to a following belt 9.

Im Unterschied dazu läuft die Faserstoffbahn 1 gemäß Figur 2 gemeinsam mit dem impermeablen Band 2 sowie einem, auf der gegenüberliegenden Seite verlaufenden, endlosen und wasseraufnehmenden Band 8 durch einen Pressspalt zur Entwässerung. Dabei kommt es zu einer einseitigen Entwässerung zum unteren Band 8 hin. Während das untere, luftdurchlässige Band 8 eine besaugte Leitwalze 12 umschlingt, kann das impermeable Band 2 nach dem Pressspalt von der Faserstoffbahn 1 weggeführt werden.In contrast, the fibrous web 1 runs according to FIG. 2 together with the impermeable belt 2 and a running on the opposite side, endless and water-absorbing belt 8 through a press nip for drainage. This leads to a one-sided drainage to the lower band 8 out. While the lower, air-permeable belt 8 wraps around an evacuated guide roller 12, the impermeable belt 2 can be led away from the fibrous web 1 after the press nip.

Claims (4)

  1. Arrangement for transferring a paper web, a paperboard web, a tissue web or another fibrous-material web (1) from an endlessly circulating, permeable belt (3) to an endlessly circulating, impermeable belt (2) in a machine for producing and/or converting a fibrous web (1), the belts (2, 3) being pressed together with the fibrous web (1) which lies between them in the region of the transfer and the impermeable belt (2) having a smooth surface at least on the side which comes into contact with the fibrous web (1), the belts (2, 3) being pressed against one another by two rolls (4) which form a transfer nip and, after the transfer, the fibrous web (1) running together with the impermeable belt (2) through a pressure nip or smoothing nip which is formed by two press rolls (6), characterized in that the line force in the transfer nip is at least 5 kN/m and at most 20 kN/m, and in that the permeable belt (3) wraps around the roll (4) which is in contact with the impermeable belt (2) after the transfer nip by at least 4° or for at least 25 mm.
  2. Arrangement according to Claim 1, characterized in that, before the transfer, the fibrous web (1) runs through a pressure nip for dewatering, preferably together with the permeable belt (3).
  3. Arrangement according to Claim 1 or 2, characterized in that the fibrous web (1) comes into contact with a smooth press roll (6) in the smoothing nip which follows the transfer.
  4. Arrangement according to Claim 1 or 2, characterized in that, after the transfer, the fibrous web (1) runs through the following pressure nip together with the impermeable belt (2) and a belt (8) which lies opposite it and preferably absorbs water.
EP03102415A 2002-10-22 2003-08-04 Arrangement for transfering a fibrous web Expired - Lifetime EP1422339B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10249040A DE10249040A1 (en) 2002-10-22 2002-10-22 Web transfer between continuous permeable and impermeable belts, in a machine for the production of paper or cardboard or tissue, has the belts pressed together at the transfer point
DE10249040 2002-10-22

Publications (2)

Publication Number Publication Date
EP1422339A1 EP1422339A1 (en) 2004-05-26
EP1422339B1 true EP1422339B1 (en) 2008-03-12

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP03102415A Expired - Lifetime EP1422339B1 (en) 2002-10-22 2003-08-04 Arrangement for transfering a fibrous web

Country Status (3)

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EP (1) EP1422339B1 (en)
AT (1) ATE389055T1 (en)
DE (2) DE10249040A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008043997A1 (en) * 2008-11-24 2010-05-27 Voith Patent Gmbh Machine for producing and / or treating a fibrous web

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4315457C2 (en) * 1993-05-10 1996-08-22 Fichtel & Sachs Ag Valve for a hydraulic telescopic vibration damper
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
FI111470B (en) * 1997-04-02 2003-07-31 Metso Paper Inc A method and apparatus for removing water from a paper or board web and introducing the web into a press section
DE19744341A1 (en) * 1997-10-07 1999-04-15 Voith Sulzer Papiertech Patent Paper machine
SE511703C2 (en) * 1998-03-20 1999-11-08 Nordiskafilt Ab Albany Use of a transfer belt for a tissue machine
ES2237428T3 (en) * 1999-05-14 2005-08-01 Metso Paper, Inc. METHOD AND MACHINE FOR THE MANUFACTURE OF PAPER OR PRINT CARTON.
DE10161989A1 (en) * 2001-12-17 2003-06-18 Voith Paper Patent Gmbh Web transfer between pairs of continuous belts, at the press section of a papermaking production/finishing machine, passes the web between two belts through a roller press gap before the transfer

Also Published As

Publication number Publication date
DE50309363D1 (en) 2008-04-24
EP1422339A1 (en) 2004-05-26
DE10249040A1 (en) 2004-05-19
ATE389055T1 (en) 2008-03-15

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