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EP3837394B1 - Paper machine and method for producing a paper or paperboard web - Google Patents

Paper machine and method for producing a paper or paperboard web Download PDF

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Publication number
EP3837394B1
EP3837394B1 EP19749318.2A EP19749318A EP3837394B1 EP 3837394 B1 EP3837394 B1 EP 3837394B1 EP 19749318 A EP19749318 A EP 19749318A EP 3837394 B1 EP3837394 B1 EP 3837394B1
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EP
European Patent Office
Prior art keywords
web
paper machine
machine according
paper
roller
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Application number
EP19749318.2A
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German (de)
French (fr)
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EP3837394A1 (en
EP3837394C0 (en
Inventor
Reinhard Leigraf
Thorsten HEIDT
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP3837394A1 publication Critical patent/EP3837394A1/en
Application granted granted Critical
Publication of EP3837394C0 publication Critical patent/EP3837394C0/en
Publication of EP3837394B1 publication Critical patent/EP3837394B1/en
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/02—Complete machines for making continuous webs of paper of the Fourdrinier type
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/44—Watermarking devices
    • D21F1/46—Dandy rolls
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
    • 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
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/021—Construction of the cylinders
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders
    • D21F5/042—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/006—Cutting the edges of the paper-web

Definitions

  • the invention relates to a paper machine for producing a paper or board web comprising a headbox, a former for sheet formation, a press section for dewatering and a drying section for drying the web, wherein the web is guided within the press section through at least two press nips, runs together with an endlessly circulating, water-absorbing dewatering belt on both sides through the first press nip and together with only one dewatering belt through the last press nip.
  • the invention also relates to a method for producing a paper or cardboard web having a filler content of between 20 and 42%, in particular with a machine according to the invention.
  • the object of the invention is therefore to enable safe operation even at high machine speeds.
  • the opposite, upper dewatering belt transfers the web to a lower dewatering belt of the second and last press nip, and this second press nip is designed to be extended.
  • This press section which is limited to two press nips, requires relatively little effort and, thanks to the two dewatering belts, already ensures a very high dewatering performance in the first press nip.
  • the first press nip can be formed by two cylindrical press rollers or can be extended.
  • the web is constantly guided by a belt or roller from the beginning of the former to the last press nip of the press section, which counteracts breakage even at higher machine speeds.
  • the extended, second press nip should preferably be formed by a lower shoe press roll with a flexible roll shell and a cylindrical, upper press roll. After the second press nip, the web runs alone along the smooth surface of the upper press roll until it is transferred to an air-permeable drying screen in the drying section.
  • the smooth surface of the upper press roll ensures good web guidance, but also a relatively smooth surface on the top of the web.
  • the web After the second press nip, the web has a dry content of at least 45%, in particular between 50 and 60%, so that a first, short free draw can be achieved in which the web runs unsupported.
  • the dryer fabric In the area of the web takeover, the dryer fabric should wrap around a guide roll that is slightly spaced from the upper press roll and is suctioned.
  • the web is advantageously guided by at least one drying wire in a meandering pattern alternately over heated drying cylinders and guide rollers, with at least one doctor being assigned to the first drying cylinder following the press section.
  • This scraper can be used to remove edges that have been separated from the web from the drying cylinder.
  • a pulper is arranged under and between the first drying cylinder and the following guide roll.
  • a suction device should be arranged between the first drying cylinder and the following guide roller on the side of the drying fabric facing away from the web, the suction width of which directed towards the web can be changed to adapt to different web widths and web positions transverse to the web travel direction.
  • At least one blowing device is arranged between the drying cylinder and the following guide roller on the side of the drying fabric facing away from the web in the region of at least one web edge, the blowing width of which is directed towards the respective web edge and can be changed transversely to the web running direction in order to adapt to the position and width of the web edge.
  • the separation of the web edges can be further supported by the fact that the first drying cylinder has a ceramic coating.
  • the web is at least substantially only dewatered downwards in the former and runs through the last press nip of the press section only together with a lower dewatering belt, as defined in claim 11.
  • the web is dewatered exclusively downwards in the former and accordingly the former has one or more water-permeable forming screens which are guided endlessly over guide rollers and which run exclusively under the web.
  • the web is always supported by an element from the former to the last press nip.
  • the invention is particularly suitable for webs with a high filler content of between 30 and 50%, preferably between 35 and 50% and in particular between 35 and 40% and/or a filler which is at least predominantly formed by titanium dioxide.
  • the decorative paper has a high filler content of between 20 and 42%, in particular between 35 and 40%.
  • the filler is essentially or exclusively titanium dioxide.
  • the stock suspension is applied evenly distributed across the web width to the lower, continuously rotating forming wire 19 of the adjacent former 3.
  • a pre-pressure roller 21 resting only lightly on the web 1 in the former 3 is covered with a screen and serves to even out the transparency and, if necessary, also to apply watermarks.
  • the web 1 is then transferred from the forming fabric 19 to a water-absorbing, upper dewatering belt 4 of the press section.
  • This dewatering belt 4 then guides the web 1 together with a water-absorbing dewatering belt 5 running beneath the web 1 through a first press nip of the press section.
  • This press gap is determined according to Figure 1 formed by a lower cylindrical press roller 22 and an upper, vacuum-fed press roller 23.
  • the lower dewatering belt 5 is guided away from the web 1, with the web 1 wrapping around the upper press roller 23 with the upper dewatering belt 4.
  • the negative pressure of the upper press roller 23 ensures secure guidance on the upper dewatering belt 4.
  • the first press nip is Figure 2 formed by a lower shoe press roll 22 and an upper, cylindrical press roll 23.
  • the web 1 is guided between the two dewatering belts 4, 5. Only in the wrapping area of a suction-treated guide roll of the upper dewatering belt 4 is the lower dewatering belt 5 guided away from the web 1.
  • the web 1 is then transferred from the upper dewatering belt 4 to a lower dewatering belt 6 of a second and last press nip of the press section.
  • the transfer is supported by a suction-applied guide roller 24 wrapped around the lower dewatering belt 6.
  • the second press nip is extended and is formed by a lower shoe press roller 7 and an upper, cylindrical press roller 8 with a smooth outer surface.
  • Shoe press rolls 7 have a flexible roll shell which is pressed by a press shoe with a concave pressing surface to the cylindrical counter press roll 8 to form an extended press nip. Due to the extended residence time of the web 1 in the press nip, they enable intensive yet gentle dewatering.
  • the water-absorbing drainage belts 4,5,6 are designed as endlessly rotating press felts.
  • the vacuum-fed press roller 23 as well as the vacuum-fed guide rollers 10, 12 have a perforated roller shell, the interior of which is at least partially connected to a vacuum source.
  • the top side of the web 1 at the end of the press section is smoother than the bottom side. This is further supported by the fact that a low-marking top side of the web 1 has already been produced in the former 3.
  • the lower dewatering belt 6 is guided away from the web 1 and the web 1 is guided alone on the jacket of the smooth cylindrical press roll 8 until it is transferred to an air-permeable drying screen 9 of a subsequent drying section for drying the web 1.
  • the latter wraps around a guide roller 10 which is slightly spaced from the upper press roller 8 and is suctioned during the transfer.
  • the web 1 runs between the upper press roll 8 and the drying screen 9 with a short free pull, i.e. unsupported. To ensure that this does not lead to a significant increase in the risk of tearing, the dry content of the web 1 should be at least 45% during this first free pull.
  • the web 1 is supported by the drying wire 9 and guided in a meandering pattern alternately over heated drying cylinders 11 and vacuumed guide rollers 12.
  • a removal doctor 15 and possibly also a subsequent cleaning doctor are assigned to the first drying cylinder 11 of the drying section.
  • the removal doctor 15 separates the web 1 or its transfer strips during transfer from the drying cylinder 11 and then guides them into a pulper 14 located below and between the first drying cylinder 11 and the following guide roller 12.
  • first drying cylinder 11 can also have a ceramic coating, which facilitates the removal of the web 1 or parts thereof.
  • a suction device 13 and a blowing device 17 are arranged between the first drying cylinder 11 and the following guide roller 12 on the side of the drying fabric 9 facing away from the web.
  • the negative pressure of the suction device 13 improves the adhesion of the web 1 or a transfer strip to the drying fabric 9.
  • blowing device 17 promotes the detachment of the web 1, but in particular of the transfer strip at the web edge from the drying fabric 9.
  • the suction width directed onto the web 1 and the blowing width transverse to the web travel direction 16 can be changed.

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  • Paper (AREA)

Description

Die Erfindung betrifft eine Papiermaschine zur Herstellung einer Papier- oder Kartonbahn umfassend einen Stoffauflauf, einen Former zur Blattbildung, eine Pressenpartie zur Entwässerung sowie eine Trockenpartie zur Trocknung der Bahn, wobei die Bahn innerhalb der Pressenpartie durch wenigstens zwei Pressspalte geführt wird, gemeinsam mit beidseitig je einem endlos umlaufenden, wasseraufnehmenden Entwässerungsband durch den ersten Pressspalt und gemeinsam mit nur einem Entwässerungsband durch den letzten Pressspalt läuft.The invention relates to a paper machine for producing a paper or board web comprising a headbox, a former for sheet formation, a press section for dewatering and a drying section for drying the web, wherein the web is guided within the press section through at least two press nips, runs together with an endlessly circulating, water-absorbing dewatering belt on both sides through the first press nip and together with only one dewatering belt through the last press nip.

Die Erfindung betrifft ebenso ein Verfahren zur Herstellung einer Papier- oder Kartonbahn, welche einen Füllstoffgehalt zwischen 20 und 42% aufweist, insbesondere mit einer erfindungsgemäßen Maschine.The invention also relates to a method for producing a paper or cardboard web having a filler content of between 20 and 42%, in particular with a machine according to the invention.

Derartige Anlagen sind seit langem bekannt, z.B. aus WO 2007/003504 A1 , wobei insbesondere die Herstellung von Dekorpapieren wegen des hohen Füllstoffanteils bei hohen Maschinengeschwindigkeiten Probleme bereitet. Diese Papiere sind markierempfindlich und weisen eine relativ geringe Nassfestigkeit auf.Such systems have been known for a long time, e.g. from WO 2007/003504 A1 , whereby the production of decorative papers in particular poses problems due to the high filler content at high machine speeds. These papers are sensitive to marking and have a relatively low wet strength.

Hinzu kommt die große Bahnbreitenvariation bei diesen Spezialpapieren.In addition, there is a large variation in web width for these specialty papers.

Die Aufgabe der Erfindung ist es daher einen sicheren Betrieb auch bei hohen Maschinengeschwindigkeiten zu ermöglichen.The object of the invention is therefore to enable safe operation even at high machine speeds.

Erfindungsgemäß wurde die Aufgabe hinsichtlich der Papiermaschine durch die Merkmale des Anspruchs 1 gelöst.According to the invention, the object with regard to the paper machine was achieved by the features of claim 1.

Ferner ist vorteilhaft, dass nach dem ersten Pressspalt dessen unteres Entwässerungsband von der Bahn weggeführt wird, das gegenüberliegende, obere Entwässerungsband die Bahn an ein unteres Entwässerungsband des zweiten und letzten Pressspaltes übergibt und dieser zweite Pressspalt verlängert ausgebildet ist.Furthermore, it is advantageous that after the first press nip, its lower dewatering belt is guided away from the web, the opposite, upper dewatering belt transfers the web to a lower dewatering belt of the second and last press nip, and this second press nip is designed to be extended.

Diese auf zwei Pressspalte begrenzte Pressenpartie ist mit relativ wenig Aufwand verbunden und gewährleistet wegen der beiden Entwässerungsbänder bereits eine sehr hohe Entwässerungsleistung im ersten Pressspalt.This press section, which is limited to two press nips, requires relatively little effort and, thanks to the two dewatering belts, already ensures a very high dewatering performance in the first press nip.

Je nach Bedarf kann der erste Pressspalt von zwei zylindrischen Presswalzen gebildet werden oder verlängert ausgeführt sein.Depending on requirements, the first press nip can be formed by two cylindrical press rollers or can be extended.

Auf jeden Fall wird die Bahn vom Beginn des Formers bis zum letzten Pressspalt der Pressenpartie ständig von einem Band oder einer Walze geführt, was einem Abriss auch bei höheren Maschinengeschwindigkeiten entgegenwirkt.In any case, the web is constantly guided by a belt or roller from the beginning of the former to the last press nip of the press section, which counteracts breakage even at higher machine speeds.

Im letzten, d.h. zweiten Pressspalt erfolgt eine schonende, aber intensive Entwässerung im verlängerten Pressspalt nach unten in das Entwässerungsband dieses Pressspaltes.In the last, i.e. second press nip, gentle but intensive dewatering takes place in the extended press nip downwards into the dewatering belt of this press nip.

Mit Vorteil sollte der verlängerte, zweite Pressspalt von einer unteren Schuh-Presswalze mit flexiblem Walzenmantel und einer zylindrischen, oberen Presswalze gebildet werden. Nach dem zweiten Pressspalt läuft die Bahn allein bis zur Übergabe an ein luftdurchlässiges Trockensieb der Trockenpartie an der glatten Mantelfläche der oberen Presswalze entlang. Die glatte Mantelfläche der oberen Presswalze sorgt für eine gute Bahnführung, aber auch für eine relativ glatte Oberfläche der Bahnoberseite.The extended, second press nip should preferably be formed by a lower shoe press roll with a flexible roll shell and a cylindrical, upper press roll. After the second press nip, the web runs alone along the smooth surface of the upper press roll until it is transferred to an air-permeable drying screen in the drying section. The smooth surface of the upper press roll ensures good web guidance, but also a relatively smooth surface on the top of the web.

Nach dem zweiten Presspalt hat die Bahn einen Trockengehalt von mindestens 45%, insbesondere zwischen 50 und 60%, so dass ein erster, kurzer freier Zug, in dem die Bahn ungestützt verläuft, realisiert werden kann. Hierbei sollte das Trockensieb im Bereich der Bahnübernahme eine, von der oberen Presswalze geringfügig beabstandete und besaugte Leitwalze umschlingen.After the second press nip, the web has a dry content of at least 45%, in particular between 50 and 60%, so that a first, short free draw can be achieved in which the web runs unsupported. In the area of the web takeover, the dryer fabric should wrap around a guide roll that is slightly spaced from the upper press roll and is suctioned.

Innerhalb der Trockenpartie wird die Bahn mit Vorteil von wenigstens einem Trockensieb mänderförmig abwechselnd über beheizte Trockenzylinder und Leitwalzen geführt wird, wobei dem ersten, auf die Pressenpartie folgenden Trockenzylinder wenigstens ein Schaber zugeordnet ist.Within the drying section, the web is advantageously guided by at least one drying wire in a meandering pattern alternately over heated drying cylinders and guide rollers, with at least one doctor being assigned to the first drying cylinder following the press section.

Über diesen Schaber können von der Bahn abgetrennte Ränder vom Trockenzylinder abgeführt werden. Hierzu ist es vorteilhaft, wenn unter und zwischen dem ersten Trockenzylinder und der folgenden Leitwalze ein Pulper angeordnet ist.This scraper can be used to remove edges that have been separated from the web from the drying cylinder. For this purpose, it is advantageous if a pulper is arranged under and between the first drying cylinder and the following guide roll.

Zur Gewährleistung einer sicheren Führung der Bahn am Trockensieb sollte zwischen dem ersten Trockenzylinder und der folgenden Leitwalze auf der bahnabgewandten Seite des Trockensiebes eine Saugeinrichtung angeordnet sein, deren auf die Bahn gerichtete Saugbreite zur Anpassung an unterschiedliche Bahnbreiten und Bahnlagen quer zur Bahnlaufrichtung veränderbar ist.To ensure that the web is guided safely on the drying fabric, a suction device should be arranged between the first drying cylinder and the following guide roller on the side of the drying fabric facing away from the web, the suction width of which directed towards the web can be changed to adapt to different web widths and web positions transverse to the web travel direction.

Um einem Weiterlaufen der abgetrennten Bahnränder nach dem ersten Trockenzylinder am Trockensieb entgegenzuwirken, ist es vorteilhaft, wenn zwischen dem ersten Trockenzylinder und der folgenden Leitwalze auf der bahnabgewandten Seite des Trockensiebes im Bereich wenigstens eines Bahnrandes zumindest eine Blaseinrichtung angeordnet ist, deren auf den jeweiligen Bahnrand gerichtete Blasbreite zur Anpassung an Lage und Breite des Bahnrandes quer zur Bahnlaufrichtung veränderbar ist.In order to prevent the separated web edges from continuing to run after the first drying cylinder on the drying fabric, it is advantageous to install a At least one blowing device is arranged between the drying cylinder and the following guide roller on the side of the drying fabric facing away from the web in the region of at least one web edge, the blowing width of which is directed towards the respective web edge and can be changed transversely to the web running direction in order to adapt to the position and width of the web edge.

Die Ablösung der Bahnränder kann noch dadurch unterstützt werden, dass der erste Trockenzylinder eine Keramikbeschichtung aufweist.The separation of the web edges can be further supported by the fact that the first drying cylinder has a ceramic coating.

Hinsichtlich des Verfahren zur Herstellung einer Papier- oder Kartonbahn, insbesondere einer Dekorpapierbahn, welche einen Füllstoffgehalt zwischen 20 und 42% aufweist, ist wesentlich, dass die Bahn im Former zumindest im Wesentlichen nur nach unten entwässert wird und durch den letzten Pressspalt der Pressenpartie nur gemeinsam mit einem unteren Entwässerungsband läuft, wie in Anspruch 11 definiert.With regard to the method for producing a paper or cardboard web, in particular a decorative paper web, which has a filler content of between 20 and 42%, it is essential that the web is at least substantially only dewatered downwards in the former and runs through the last press nip of the press section only together with a lower dewatering belt, as defined in claim 11.

Auf diese Weise bleibt die Bahnoberseite weitestgehend markierungsfrei.In this way, the top surface of the track remains largely free of markings.

Daher ist es von Vorteil, wenn die Bahn im Former ausschließlich nach unten entwässert wird und dementsprechend der Former ein oder mehrere endlos über Leitwalzen geführte wasserdurchlässige Formiersiebe besitzt, welche ausschließlich unter der Bahn verlaufen.It is therefore advantageous if the web is dewatered exclusively downwards in the former and accordingly the former has one or more water-permeable forming screens which are guided endlessly over guide rollers and which run exclusively under the web.

Außerdem wird die Bahn vom Former bis zum letzten Presspalt immer von einem Element gestützt.In addition, the web is always supported by an element from the former to the last press nip.

Besonders eignet sich die Erfindung für Bahnen mit einem hohen Füllstoffgehalt zwischen 30 und 50%, vorzugsweise zwischen 35 und 50% und insbesondere zwischen 35 und 40% und/oder einem Füllstoff, der zumindest überwiegend von Titandioxid gebildet wird.The invention is particularly suitable for webs with a high filler content of between 30 and 50%, preferably between 35 and 50% and in particular between 35 and 40% and/or a filler which is at least predominantly formed by titanium dioxide.

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

  • Figur 1: ein Anlagenschema eines ersten Teiles einer Papiermaschine zur Herstellung von Dekorpapier und
  • Figur 2: eine alternative Pressenpartie davon.
The invention will be explained in more detail below using two exemplary embodiments. The attached drawing shows:
  • Figure 1 : a plant diagram of a first part of a paper machine for the production of decorative paper and
  • Figure 2 : an alternative press section of it.

Das Dekorpapier weist einen hohen Füllstoffgehalt zwischen 20 und 42%, insbesondere zwischen 35 und 40% auf. Der Füllstoff wird dabei im Wesentlichen oder ausschließlich von Titandioxid gebildet.The decorative paper has a high filler content of between 20 and 42%, in particular between 35 and 40%. The filler is essentially or exclusively titanium dioxide.

Diese Spezialpapiere sind nicht allzu reißfest und sehr markierempfindlich. Außerdem erfolgt die Herstellung meist mit einer relativ großen Bahnbreitenvariation.These special papers are not particularly tear-resistant and are very sensitive to marking. In addition, they are usually manufactured with a relatively large web width variation.

Vom Stoffauflauf 2 wird die Stoffsuspension über die Bahnbreite gleichmäßig verteilt auf das untere, endlos umlaufende Formiersieb 19 des angrenzenden Formers 3 aufgebracht.From the headbox 2, the stock suspension is applied evenly distributed across the web width to the lower, continuously rotating forming wire 19 of the adjacent former 3.

Im Former 3 kommt es zur Blattbildung infolge Entwässerung durch das wasserdurchlässige, über Leitwalzen 18 geführte Formiersieb 19, d.h. die Entwässerung erfolgt ausschließlich nach unten. Diese Entwässerung wird mittels Unterdruck gefördert, welcher von unter dem Formiersieb 19 vorhandenen Foils und Saugkästen 20 ausgeht.In the former 3, sheet formation occurs as a result of dewatering through the water-permeable forming screen 19, which is guided over guide rollers 18, i.e. dewatering takes place exclusively downwards. This dewatering is promoted by means of negative pressure, which emanates from foils and suction boxes 20 located under the forming screen 19.

Eine im Former 3 nur leicht auf der Bahn 1 aufliegende Vordruckwalze 21 ist mit einem Sieb bespannt und dient der Durchsichtsvergleichmäßigung und bei Bedarf auch zum Aufbringen von Wasserzeichen.A pre-pressure roller 21 resting only lightly on the web 1 in the former 3 is covered with a screen and serves to even out the transparency and, if necessary, also to apply watermarks.

Da nur die Unterseite der Bahn 1 mit einem Formiersieb 19 in Kontakt kommt, bleibt die Oberseite weitestgehend markierungsfrei.Since only the underside of the web 1 comes into contact with a forming fabric 19, the upper side remains largely free of markings.

Die Bahn 1 wird dann vom Formiersieb 19 an ein wasseraufnehmendes, oberes Entwässerungsband 4 der Pressenpartie übergeben.The web 1 is then transferred from the forming fabric 19 to a water-absorbing, upper dewatering belt 4 of the press section.

Dieses Entwässerungsband 4 führt die Bahn 1 anschließend gemeinsam mit einem unter der Bahn 1 verlaufenden, wasseraufnehmenden Entwässerungsband 5 durch einen ersten Pressspalt der Pressenpartie.This dewatering belt 4 then guides the web 1 together with a water-absorbing dewatering belt 5 running beneath the web 1 through a first press nip of the press section.

Dieser Pressspalt wird gemäß Figur 1 von einer unteren zylindrischen Presswalze 22 und einer oberen, besaugten Presswalze 23 gebildet.This press gap is determined according to Figure 1 formed by a lower cylindrical press roller 22 and an upper, vacuum-fed press roller 23.

Nach dem ersten Pressspalt wird das untere Entwässerungsband 5 von der Bahn 1 weggeführt, wobei die Bahn 1 mit dem oberen Entwässerungsband 4 die obere Presswalze 23 nachumschlingt. Dabei sorgt der Unterdruck der oberen Presswalze 23 für eine sichere Führung am oberen Entwässerungsband 4.After the first press nip, the lower dewatering belt 5 is guided away from the web 1, with the web 1 wrapping around the upper press roller 23 with the upper dewatering belt 4. The negative pressure of the upper press roller 23 ensures secure guidance on the upper dewatering belt 4.

Im Unterschied hierzu wird der erste Pressspalt bei Figur 2 von einer unteren Schuh-Presswalze 22 und einer oberen, zylindrischen Presswalze 23 gebildet. Nach diesem verlängerten Pressspalt wird die Bahn 1 zwischen beiden Entwässerungsbändern 4,5 geführt. Erst im Umschlingungsbereich einer besaugten Leitwalze des oberen Entwässerungsbandes 4 wird das untere Entwässerungsband 5 von der Bahn 1 weggeführt.In contrast, the first press nip is Figure 2 formed by a lower shoe press roll 22 and an upper, cylindrical press roll 23. After this extended press nip, the web 1 is guided between the two dewatering belts 4, 5. Only in the wrapping area of a suction-treated guide roll of the upper dewatering belt 4 is the lower dewatering belt 5 guided away from the web 1.

Hiernach wird die Bahn 1 in beiden Fällen vom oberen Entwässerungsband 4 an ein unteres Entwässerungsband 6 eines zweiten und letzten Pressspaltes der Pressenpartie übergeben. Die Übernahme wird dabei von einer vom unteren Entwässerungsband 6 umschlungenen, besaugten Leitwalze 24 unterstützt.In both cases, the web 1 is then transferred from the upper dewatering belt 4 to a lower dewatering belt 6 of a second and last press nip of the press section. The transfer is supported by a suction-applied guide roller 24 wrapped around the lower dewatering belt 6.

Der zweite Pressspalt ist verlängert ausgebildet und wird hierzu von einer unteren Schuh-Presswalze 7 und einer oberen, zylindrischen Presswalze 8 mit glatter Mantelfläche gebildet.The second press nip is extended and is formed by a lower shoe press roller 7 and an upper, cylindrical press roller 8 with a smooth outer surface.

Schuh-Presswalzen 7 besitzen einen flexiblen Walzenmantel, der von einem Pressschuh mit konkaver Pressfläche zur Bildung eines verlängerten Pressspaltes zur zylindrischen Gegen-Presswalze 8 gedrückt wird. Sie ermöglichen wegen der verlängerten Verweilzeit der Bahn 1 im Pressspalt eine intensive und dennoch schonende Entwässerung.Shoe press rolls 7 have a flexible roll shell which is pressed by a press shoe with a concave pressing surface to the cylindrical counter press roll 8 to form an extended press nip. Due to the extended residence time of the web 1 in the press nip, they enable intensive yet gentle dewatering.

Weil die Bahn 1 im ersten Pressspalt einen relativ hohen Feuchtegehalt hat, wird dort nicht immer ein verlängerter Pressspalt benötigt.Because web 1 has a relatively high moisture content in the first press nip, an extended press nip is not always required there.

Die wasseraufnehmenden Entwässerungsbänder 4,5,6 sind als endlos umlaufende Pressfilze ausgebildet.The water-absorbing drainage belts 4,5,6 are designed as endlessly rotating press felts.

Die besaugte Presswalze 23 wie auch die besaugten Leitwalzen 10,12 haben einen perforierten Walzenmantel, dessen Innenraum, zumindest teilweise mit einer Unterdruckquelle verbunden ist.The vacuum-fed press roller 23 as well as the vacuum-fed guide rollers 10, 12 have a perforated roller shell, the interior of which is at least partially connected to a vacuum source.

Da die Bahn 1 nur gemeinsam mit einem unteren Entwässerungsband 6 durch den zweiten Presspalt läuft und die obere Presswalze 8 dieses Pressspaltes eine glatte Mantelfläche aufweist, ist die Oberseite der Bahn 1 am Ende der Pressenpartie glatter als die Unterseite. Unterstützt wird dies noch dadurch, dass bereits im Former 3 eine markierungsarme Oberseite der Bahn 1 erzeugt wurde.Since the web 1 only runs through the second press nip together with a lower dewatering belt 6 and the upper press roller 8 of this press nip has a smooth outer surface, the top side of the web 1 at the end of the press section is smoother than the bottom side. This is further supported by the fact that a low-marking top side of the web 1 has already been produced in the former 3.

Nach dem zweiten Pressspalt wird das untere Entwässerungsband 6 von der Bahn 1 weg und die Bahn 1 allein am Mantel der glatten zylindrischen Presswalze 8 bis zur Übergabe an ein luftdurchlässiges Trockensieb 9 einer folgenden Trockenpartie zur Trocknung der Bahn 1 weitergeführt.After the second press nip, the lower dewatering belt 6 is guided away from the web 1 and the web 1 is guided alone on the jacket of the smooth cylindrical press roll 8 until it is transferred to an air-permeable drying screen 9 of a subsequent drying section for drying the web 1.

Um die Übergabe an das luftdurchlässige Trockensieb 9 zu unterstützen, umschlingt diese während der Übernahme eine, von der oberen Presswalze 8 geringfügig beabstandete und besaugte Leitwalze 10.In order to support the transfer to the air-permeable drying screen 9, the latter wraps around a guide roller 10 which is slightly spaced from the upper press roller 8 and is suctioned during the transfer.

Zwischen der oberen Presswalze 8 und dem Trockensieb 9 läuft die Bahn 1 mit einem kurzen freien Zug, d.h. ungestützt. Damit dies nicht zu einer wesentlichen Erhöhung der Abrissgefahr führt, sollte der Trockengehalt der Bahn 1 bei diesem ersten freien Zug mindestens 45% betragen.The web 1 runs between the upper press roll 8 and the drying screen 9 with a short free pull, i.e. unsupported. To ensure that this does not lead to a significant increase in the risk of tearing, the dry content of the web 1 should be at least 45% during this first free pull.

Im Ergebnis werden so Maschinengeschwindigkeiten von wesentlich über 1.000 m/min möglich.As a result, machine speeds of well over 1,000 m/min are possible.

In der Trockenpartie wird die Bahn 1 vom Trockensieb 9 gestützt, mäanderförmig abwechselnd über beheizte Trockenzylinder 11 und besaugte Leitwalzen 12 geführt.In the drying section, the web 1 is supported by the drying wire 9 and guided in a meandering pattern alternately over heated drying cylinders 11 and vacuumed guide rollers 12.

Dabei sind dem ersten Trockenzylinder 11 der Trockenpartie ein Abnahme-Schaber 15 sowie eventuell auch noch ein folgender Reinigungs-Schaber zugeordnet. Der Abnahme-Schaber 15 trennt die Bahn 1 oder deren Überführstreifen beim Überführen vom Trockenzylinder 11 und leitet diese dann in einen unter und zwischen dem ersten Trockenzylinder 11 und der folgenden Leitwalze 12 befindlichen Pulper 14.A removal doctor 15 and possibly also a subsequent cleaning doctor are assigned to the first drying cylinder 11 of the drying section. The removal doctor 15 separates the web 1 or its transfer strips during transfer from the drying cylinder 11 and then guides them into a pulper 14 located below and between the first drying cylinder 11 and the following guide roller 12.

Zusätzlich kann der erste Trockenzylinder 11 auch eine Keramikbeschichtung aufweisen, was das Ablösen der Bahn 1 oder Teilen davon erleichtert.In addition, the first drying cylinder 11 can also have a ceramic coating, which facilitates the removal of the web 1 or parts thereof.

Um das Überführen der Bahn 1 sicher und stabil zu gestalten, sind zwischen dem ersten Trockenzylinder 11 und der folgenden Leitwalze 12 auf der bahnabgewandten Seite des Trockensiebes 9 eine Saugeinrichtung 13 sowie eine Blaseinrichtung 17 angeordnet.In order to ensure that the web 1 is transferred safely and stably, a suction device 13 and a blowing device 17 are arranged between the first drying cylinder 11 and the following guide roller 12 on the side of the drying fabric 9 facing away from the web.

Der Unterdruck der Saugeinrichtung 13 verbessert die Haftung der Bahn 1 oder eines Überführstreifens am Trockensieb 9.The negative pressure of the suction device 13 improves the adhesion of the web 1 or a transfer strip to the drying fabric 9.

Demgegenüber fördert die Blaseinrichtung 17 das Ablösen der Bahn 1, insbesondere jedoch des Überführstreifens am Bahnrand vom Trockensieb 9.In contrast, the blowing device 17 promotes the detachment of the web 1, but in particular of the transfer strip at the web edge from the drying fabric 9.

Zur Anpassung an die aktuelle Lage und Breite der Bahn 1 sind die auf die Bahn 1 gerichtete Saugbreite sowie Blasbreite quer zur Bahnlaufrichtung 16 veränderbar.In order to adapt to the current position and width of the web 1, the suction width directed onto the web 1 and the blowing width transverse to the web travel direction 16 can be changed.

Claims (15)

  1. Paper machine for producing a paper or paperboard web (1), in particular a decorative paper web (1), with a filler content between 20 and 42%, comprising a former (3) for sheet formation and a pressing section for dewatering which has at least one final pressure nip, wherein the former (3) comprises one or more endless water-permeable forming fabrics (19) which are guided over guiding rollers (18) and run exclusively below the web (1), and the web (1) runs through the last pressure nip together with only one lower dewatering belt (6).
  2. Paper machine according to Claim 1, wherein the paper machine has a headbox (2) and a drying section for drying the web (1), wherein the pressing section has at least two pressure nips and the web (1) is guided through a first pressure nip together with an endlessly circulating, water-absorbing dewatering belt (4, 5) on both sides, and wherein after the first pressure nip in which the lower dewatering belt (5) is guided away from the web (1), the opposite upper dewatering belt (4) transfers the web (1) to a lower dewatering belt (6) of the second and last pressure nip, and this second pressure nip is formed elongated.
  3. Paper machine according to Claim 2, wherein the elongated second and last pressure nip is formed by a lower shoe pressing roller (7) with flexible roller casing and a cylindrical upper pressing roller (8), wherein after the second pressure nip, the web (1) runs alone until the transfer to an air-permeable dryer fabric (9) of the drying section on the smooth casing surface of the upper pressing roller (8).
  4. Paper machine according to Claim 3, wherein the paper or paperboard web (1) is guided unsupported in a first free travel between the upper pressing roller (8) and the dryer fabric (9).
  5. Paper machine according to any of the preceding claims, wherein inside the drying section, the web (1) is guided by at least one dryer fabric (9) meandering alternately over heated dryer cylinders (11) and guiding rollers (12), wherein at least one ductor (15) is assigned to the first dryer cylinder (11) following the pressing section.
  6. Paper machine according to Claim 5, wherein a pulper (14) is arranged below and between the first dryer cylinder (11) and the following guiding roller (12).
  7. Paper machine according to Claim 5 or 6, wherein a suction device (13) is arranged between the first dryer cylinder (11) and the following guiding roller (12) on the side of the dryer fabric (9) facing away from the web, the suction width of which device directed at the web (1) is variable transversely to the web running direction (16).
  8. Paper machine according to any of Claims 5 to 7, wherein at least one blowing device (17) is arranged between the first dryer cylinder (11) and the following guiding roller (12) on the side of the dryer fabric (9) facing away from the web in the region of at least one web edge, the blowing width of which device directed at the web edge is variable transversely to the web running direction (16).
  9. Paper machine according to any of Claims 5 to 8, wherein the first dryer cylinder (11) has a ceramic coating.
  10. Paper machine according to any of the preceding claims, wherein the former (3) has a dandy roller (21) resting only lightly on the web (1).
  11. Method for producing a paper or paperboard web (1) which has a filler content between 20 and 42%, with a machine according to any of the preceding claims, wherein the web (1) is at least substantially only dewatered downward in the former (3) and runs through the last pressure nip of the pressing section only together with a lower dewatering belt (6).
  12. Method according to Claim 11, wherein the web (1) is dewatered exclusively downward in the former (3).
  13. Method according to Claim 11 or 12, wherein the filler content of the web (1) is between 35 and 40%.
  14. Method according to any of Claims 11 to 13, wherein the filler is formed at least largely from titanium dioxide.
  15. Method according to any of Claims 11 to 14, wherein the dry content of the web (1) on the first free travel between the upper pressing roller (8) and the dryer fabric (9) is at least 45%.
EP19749318.2A 2018-08-14 2019-07-31 Paper machine and method for producing a paper or paperboard web Active EP3837394B1 (en)

Applications Claiming Priority (2)

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DE102018119686.5A DE102018119686A1 (en) 2018-08-14 2018-08-14 paper machine
PCT/EP2019/070674 WO2020035318A1 (en) 2018-08-14 2019-07-31 Paper machine and method for producing a paper or paperboard web

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EP3837394A1 EP3837394A1 (en) 2021-06-23
EP3837394C0 EP3837394C0 (en) 2024-06-12
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CN (1) CN112585318A (en)
DE (1) DE102018119686A1 (en)
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DE102020131965A1 (en) * 2020-12-02 2022-06-02 Voith Patent Gmbh paper machine
DE102021103519A1 (en) 2021-02-15 2022-08-18 Koehler Innovation & Technology Gmbh Process for the production of a fibrous web
CN114438827B (en) * 2022-01-19 2024-01-12 云南建投第二安装工程有限公司 A device and method for improving the foundation of the fan box in the drying part of the pulp machine
DE102023102861A1 (en) * 2023-02-07 2024-08-08 Voith Patent Gmbh Paper machine for producing a fibrous web and method for producing a fibrous web

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ATE133217T1 (en) * 1992-11-24 1996-02-15 Voith Gmbh J M PRESS SECTION FOR A PAPER MACHINE
DE19609988A1 (en) * 1996-03-14 1997-09-18 Voith Sulzer Papiermasch Gmbh Press section of a paper machine
CN2345574Y (en) * 1998-12-30 1999-10-27 宋大兴 Counter and consequent three net formed paper making machine without waste water
FI20002122A7 (en) * 2000-06-02 2001-12-03 Metso Paper Inc Arrangement for improving the start of the drying section of a paper machine
FI111174B (en) * 2000-10-27 2003-06-13 Metso Paper Inc Method and apparatus for the tip drawing in a paper machine or corresponding drying portion
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FI116400B (en) * 2002-11-19 2005-11-15 Metso Paper Inc Press section in a paper or cardboard machine
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CN206173736U (en) * 2016-08-31 2017-05-17 江苏理文造纸有限公司 Energy -conserving formula screen cloth dewatering device

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WO2020035318A1 (en) 2020-02-20
DE102018119686A1 (en) 2020-02-20
CN112585318A (en) 2021-03-30
EP3837394C0 (en) 2024-06-12

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