EP3548664B1 - Pressing arrangement - Google Patents

Pressing arrangement Download PDF

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Publication number
EP3548664B1
EP3548664B1 EP17811885.7A EP17811885A EP3548664B1 EP 3548664 B1 EP3548664 B1 EP 3548664B1 EP 17811885 A EP17811885 A EP 17811885A EP 3548664 B1 EP3548664 B1 EP 3548664B1
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EP
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Prior art keywords
press
fibrous web
belt
arrangement according
roll
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EP17811885.7A
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German (de)
French (fr)
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EP3548664A1 (en
Inventor
Johann Moser
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Voith Patent GmbH
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Voith Patent GmbH
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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
    • 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

Definitions

  • the invention relates to a press arrangement for dewatering a paper, cardboard, tissue or other fibrous web in a machine for the production and/or finishing of the same, with a suction roll around which an endlessly revolving, water-absorbing and air-permeable dewatering belt and the outer fibrous web are wrapped, and a following in the direction of web travel, surrounded by a smooth, endlessly revolving, cylindrical central roll, which is involved in the formation of at least one press nip with a press roll, around which an endlessly revolving, water-absorbing dewatering belt is wrapped, with the transfer belt taking over the fibrous web from the dewatering belt of the suction roll .
  • Such press assemblies are, for example, from EP 1 342 837 A2 as well as the EP 0 107 606 A2 well-known and because of their compactness they offer not only space but also cost advantages.
  • the object of the invention is therefore to ensure efficient dewatering with reliable web guidance.
  • the construction of the press arrangement is simplified considerably by the distance and the associated decoupling between the suction roll and the central roll.
  • the transfer press nip ensures that the web is securely transferred from the dewatering belt to the much smoother, non-permeable transfer belt. Accordingly, to avoid rewetting of the fibrous web, the dewatering belt should be guided away from the fibrous web immediately after the transfer press nip, so that the fibrous web is guided from the transfer press nip to the central roll solely by the transfer belt.
  • the transfer belt runs vertically between the transfer press nip and the central roller or is inclined in the direction of web travel by a maximum of 35° to the vertical.
  • the dewatering can be supported by an increased viscosity as a result of heating the fibrous web.
  • the fibrous web should be subjected to steam from a steam blower box between the transfer press nip and the central roll.
  • the central roll forms a press nip with at least two press rolls each wrapped around by a separate, endlessly circulating and water-absorbing dewatering belt.
  • At least one press nip of the cylindrical central roller should be designed to be longer for intensive but volume-saving dewatering.
  • the extended press nip is formed in a known manner by a shoe press roll which has a flexible roll mantle which runs in the area of the press nip over a pressure shoe with a concave pressing surface.
  • the central roller also offers sufficient space for the realization of several press nips, it should have a diameter of at least 100 cm, preferably at least 160 cm.
  • the suction roll should form a press nip, preferably the first press nip of the press arrangement, with a press roll around which an endlessly revolving, water-absorbing dewatering belt is wrapped. Due to the still relatively high moisture content of the fibrous web, low pressing forces are sufficient.
  • the dewatering belt of the suction roll should take the fibrous web from an endless circulating belt, preferably a forming fabric of an upstream former for sheet formation and/or the fibrous web after the central roll from the transfer belt to an endless circulating belt, preferably an air-permeable drying fabric of a following drying unit be handed over to the machine.
  • the fibrous web is continuously guided by at least one belt between the former and the drying unit.
  • the dewatering can be further supported by the forming fabric being guided through a pre-press nip before the fibrous web is delivered, together with an endlessly circulating, water-absorbing dewatering belt and the fibrous web lying in between.
  • This press arrangement is used for dewatering a fibrous web 1, in particular a cardboard web in a paper machine for the production of the same.
  • a high rigidity of the cardboard should be achieved by an efficient, but nevertheless volume-preserving dewatering of the fibrous web 1 .
  • the smooth transfer belt creates a good carton surface, so that an offset press, which usually follows, can be omitted.
  • the fibrous web 1 is transferred from the water-permeable forming fabric 22 to a water- and air-permeable dewatering belt 4 of the subsequent press arrangement.
  • the fibrous web 1 is pre-dewatered.
  • the forming fabric 22 is guided together with a water-absorbing dewatering belt 23 and the fibrous web 1 lying in between through a pre-press nip 10 formed by two press rollers 24,25.
  • the dewatering belt 4 that takes over the fibrous web 1 from the forming fabric 22 is arranged above it and guides the fibrous web 1 together with a dewatering belt 19 running under the fibrous web 1 through a first press nip 11.
  • the first press nip 11 is formed by a lower cylindrical press roller 20 and one above it lying suction roll 2 formed.
  • the press roll 20 can also be a shoe press roll.
  • the fibrous web 1 is heated by means of steam being applied via a steam blower box 9 in the wrap area of the suction roll 2, which promotes the dewatering of the fibrous web 1.
  • the fibrous web 1 is transferred from the upper dewatering belt 4 to a water-impermeable and smooth transfer belt 6 arranged under the fibrous web 1 .
  • the dewatering belt 4 , the transfer belt 6 and the fibrous web 1 lying between them are guided through a transfer press nip 12 which is formed by the suction roll 2 and a cylindrical press roll 7 .
  • This transfer belt 6 guides the fibrous web 1 lying on top around a central roller 3 rotating under the transfer belt 6 and, after being wrapped around the central roller 3, transfers it to an upper, endlessly circulating and air-permeable drying fabric 21 of a following drying unit of the paper machine.
  • the following drying unit is formed by a drying group in which the fibrous web 1 is supported by the drying fabric 21 for drying and is guided alternately over heated drying cylinders 26 and guide rollers 27 .
  • the fibrous web 1 is constantly guided between the former and the drying unit by at least one belt 4.6, which makes the web run very stable even at high machine speeds and high basis weights of the fibrous web 1.
  • the clearance between the suction roll 2 and the central roll 3 is between 250 and 2,000 mm.
  • the decoupling of both rollers 2.3 simplifies the construction of the press arrangement considerably.
  • the distance is also necessary in particular because contact between the central roller 3 and the suction roller 2 cannot be achieved because of the press roller 7 .
  • the transfer belt 6 runs perpendicularly in this section or, as shown in the figure, slightly in the machine direction perpendicular inclined.
  • the fibrous web 1 between the transfer press nip 12 and the central roller 3 is again subjected to steam from a steam blower box 8 .
  • the cylindrical central roller 3 With a diameter of more than 160 cm, the cylindrical central roller 3 is relatively large, so that two further press gaps 13, 14 can be formed in the area where the transfer belt 6 wraps around the outer fibrous web 1.
  • the first press nip 13 in the direction of web travel 5 is formed between the central roller 3 and a cylindrical press roller 17 around which a separate dewatering belt 15 is wrapped.
  • the second subsequent press nip 14 is extended.
  • a shoe press roller 18 also wrapped by an endlessly circulating dewatering belt 16 , is pressed against the central roller 3 .
  • Shoe press rollers 18 generally consist of a flexible roller shell that runs over a pressure shoe with a concave pressing surface in the area of the extended press nip 14 .
  • the endlessly revolving dewatering belts 4,15,16,19,23 are used for receiving and transporting away the water pressed out of the fibrous web 1 in the respective press nip 10,11,12,13,14 and are mostly designed as press felts.
  • the acquisition of the fibrous web 1 is often supported by a suction-controlled guide roller 28, 29 wrapped around the absorbing dewatering belt 4 or drying fabric 21.
  • the evacuated guide roller 28,29 has a perforated roller shell, the interior of which is connected to a vacuum source.

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  • Paper (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Finger-Pressure Massage (AREA)
  • Treatment Of Fiber Materials (AREA)

Description

Die Erfindung betrifft eine Pressanordnung zur Entwässerung einer Papier-, Karton-, Tissue- oder einer anderen Faserstoffbahn in einer Maschine zur Herstellung und/oder Veredlung derselben mit einer, von einem endlos umlaufenden, wasseraufnehmenden und luftdurchlässigen Entwässerungsband sowie der außenliegenden Faserstoffbahn umschlungenen Saugwalze und einer in Bahnlaufrichtung folgenden, von einem glatten, endlos umlaufenden Transferband umschlungenen, zylindrischen Zentralwalze, die an der Bildung von wenigstens einem Pressspalt mit einer, von einem endlos umlaufenden, wasseraufnehmenden Entwässerungsband umschlungenen Presswalze beteiligt ist, wobei das Transferband die Faserstoffbahn von dem Entwässerungsband der Saugwalze übernimmt.The invention relates to a press arrangement for dewatering a paper, cardboard, tissue or other fibrous web in a machine for the production and/or finishing of the same, with a suction roll around which an endlessly revolving, water-absorbing and air-permeable dewatering belt and the outer fibrous web are wrapped, and a following in the direction of web travel, surrounded by a smooth, endlessly revolving, cylindrical central roll, which is involved in the formation of at least one press nip with a press roll, around which an endlessly revolving, water-absorbing dewatering belt is wrapped, with the transfer belt taking over the fibrous web from the dewatering belt of the suction roll .

Derartige Pressenanordnungen sind beispielsweise aus der EP 1 342 837 A2 sowie der EP 0 107 606 A2 bekannt und bieten wegen ihrer Kompaktheit neben Raumauch Kostenvorteile.Such press assemblies are, for example, from EP 1 342 837 A2 as well as the EP 0 107 606 A2 well-known and because of their compactness they offer not only space but also cost advantages.

Problematisch gestaltet sich dabei jedoch die Übergabe der Faserstoffbahn an das Transferband.However, the transfer of the fibrous web to the transfer belt is problematic.

Hinzu kommt oft auch die Notwendigkeit einer nachfolgenden Offsetpresse zur Beseitigung von Filzmarkierungen bei der Faserstoffbahn verbunden mit einem Verlust an Volumen und Steifigkeit.In addition, there is often the need for a subsequent offset press to eliminate felt markings on the fibrous web, combined with a loss in volume and rigidity.

Die Aufgabe der Erfindung ist es daher eine effiziente Entwässerung bei sicherer Bahnführung zu gewährleisten.The object of the invention is therefore to ensure efficient dewatering with reliable web guidance.

Erfindungsgemäß wurde die Aufgabe durch die Merkmale des Anspruchs 1 gelöst.According to the invention the object was achieved by the features of claim 1.

Durch den Abstand und die damit verbundenen Entkopplung zwischen Saugwalze und Zentralwalze vereinfacht sich der Aufbau der Pressanordnung erheblich. Dabei gewährleistet der Übergabe-Pressspalt eine sichere Bahnübergabe vom Entwässerungsband an das wesentlich glattere, nicht-permeable Transferband. Dementsprechend sollte das Entwässerungsband auch zur Vermeidung einer Rückbefeuchtung der Faserstoffbahn unmittelbar nach dem Übergabe-Pressspalt von der Faserstoffbahn weggeführt werden, so dass die Faserstoffbahn vom Übergabe-Pressspalt zur Zentralwalze allein vom Transferband geführt wird.The construction of the press arrangement is simplified considerably by the distance and the associated decoupling between the suction roll and the central roll. The transfer press nip ensures that the web is securely transferred from the dewatering belt to the much smoother, non-permeable transfer belt. Accordingly, to avoid rewetting of the fibrous web, the dewatering belt should be guided away from the fibrous web immediately after the transfer press nip, so that the fibrous web is guided from the transfer press nip to the central roll solely by the transfer belt.

Um dabei eine sichere Haftung der Faserstoffbahn am Transferband sicherzustellen, ist es von Vorteil, wenn das Transferband zwischen dem Übergabe-Pressspalt und der Zentralwalze senkrecht oder in Bahnlaufrichtung maximal bis zu 35° geneigt zur Senkrechten verläuft.In order to ensure reliable adhesion of the fibrous web to the transfer belt, it is advantageous if the transfer belt runs vertically between the transfer press nip and the central roller or is inclined in the direction of web travel by a maximum of 35° to the vertical.

Des Weiteren kann die Entwässerung noch durch eine erhöhte Viskosität infolge Aufheizung der Faserstoffbahn unterstützt werden. Hierzu sollte die Faserstoffbahn zwischen dem Übergabe-Pressspalt und der Zentralwalze von einem Dampfblaskasten mit Dampf beaufschlagt werden.Furthermore, the dewatering can be supported by an increased viscosity as a result of heating the fibrous web. For this purpose, the fibrous web should be subjected to steam from a steam blower box between the transfer press nip and the central roll.

Erfindungsgemäß bildet die Zentralwalze mit zumindest zwei, jeweils von einem separaten, endlos umlaufenden und wasseraufnehmenden Entwässerungsband umschlungenen Presswalzen je einen Pressspalt.According to the invention, the central roll forms a press nip with at least two press rolls each wrapped around by a separate, endlessly circulating and water-absorbing dewatering belt.

Für eine intensive aber dennoch volumenschonende Entwässerung sollte zumindest ein Pressspalt der zylindrischen Zentralwalze verlängert ausgebildet sein.At least one press nip of the cylindrical central roller should be designed to be longer for intensive but volume-saving dewatering.

Im allgemeinen wird der verlängerte Pressspalt auf bekannte Weise von einer Schuhpresswalze gebildet, welche einen flexiblen Walzenmantel besitzt, der im Bereich des Pressspaltes über einen Anpressschuh mit konkaver Pressfläche läuft.In general, the extended press nip is formed in a known manner by a shoe press roll which has a flexible roll mantle which runs in the area of the press nip over a pressure shoe with a concave pressing surface.

Meist genügt es zur Begrenzung des Aufwandes nur den letzten Pressspalt der Zentralwalze verlängert auszuführen. Jedoch kann die Entwässerungsleistung optimiert werden, wenn beide Pressspalte der Zentralwalze verlängert ausgebildet sind.Usually it is sufficient to limit the effort only the last press nip Extended central roller. However, the dewatering performance can be optimized if both press nips of the central roll are made longer.

Damit die Zentralwalze auch ausreichend Platz zur Realisierung von mehreren Pressspalten bietet, sollte diese einen Durchmesser von mindestens 100 cm, vorzugsweise wenigstens 160 cm haben.So that the central roller also offers sufficient space for the realization of several press nips, it should have a diameter of at least 100 cm, preferably at least 160 cm.

Zur umfassenden Nutzung der Saugwalze sollte diese mit einer, von einem endlos umlaufenden, wasseraufnehmenden Entwässerungsband umschlungenen Presswalze einen Pressspalt, vorzugsweise den ersten Pressspalt der Pressanordnung bilden. Wegen des noch relativ hohen Feuchtegehaltes der Faserstoffbahn genügen hierbei geringe Presskräfte.For comprehensive use of the suction roll, it should form a press nip, preferably the first press nip of the press arrangement, with a press roll around which an endlessly revolving, water-absorbing dewatering belt is wrapped. Due to the still relatively high moisture content of the fibrous web, low pressing forces are sufficient.

Außerdem kann es zur Aufheizung der Faserstoffbahn von Vorteil sein, wenn der Faserstoffbahn im Umschlingungsbereich der Saugwalze, vor dem Übergabe-Pressspalt ein Dampfblaskasten zugeordnet ist.In addition, it can be advantageous for heating the fibrous web if a steam blower box is assigned to the fibrous web in the wrapping area of the suction roll, in front of the transfer press nip.

Für eine sichere Bahnführung sollte das Entwässerungsband der Saugwalze die Faserstoffbahn von einem endlos umlaufenden Band, vorzugsweise einem Formiersieb eines vorgelagerten Formers zur Blattbildung übernehmen und/oder die Faserstoffbahn nach der Zentralwalze vom Transferband an ein endlos umlaufendes Band, vorzugsweise ein luftdurchlässiges Trockensieb einer folgenden Trockeneinheit der Maschine übergeben werden.For reliable web guidance, the dewatering belt of the suction roll should take the fibrous web from an endless circulating belt, preferably a forming fabric of an upstream former for sheet formation and/or the fibrous web after the central roll from the transfer belt to an endless circulating belt, preferably an air-permeable drying fabric of a following drying unit be handed over to the machine.

Bei hohen Maschinengeschwindigkeiten und/oder hohen Flächengewichten ist es hierbei vorteilhaft, wenn die Faserstoffbahn zwischen dem Former und der Trockeneinheit ständig von zumindest einem Band geführt wird.At high machine speeds and/or high basis weights, it is advantageous if the fibrous web is continuously guided by at least one belt between the former and the drying unit.

Zusätzlich kann die Entwässerung noch dadurch unterstützt werden, dass das Formiersieb vor der Abgabe der Faserstoffbahn gemeinsam mit einem endlos umlaufenden, wasseraufnehmenden Entwässerungsband und der dazwischenliegenden Faserstoffbahn durch einen Vor-Pressspalt geführt wird.In addition, the dewatering can be further supported by the forming fabric being guided through a pre-press nip before the fibrous web is delivered, together with an endlessly circulating, water-absorbing dewatering belt and the fibrous web lying in between.

Nachfolgend soll die Erfindung an einem Ausführungsbeispiel näher erläutert werden. In der beigefügten Zeichnung zeigt die Figur eine schematische Darstellung einer erfindungsgemäßen Pressanordnung.The invention will be explained in more detail below using an exemplary embodiment. In the accompanying drawing, the figure shows a schematic representation of a pressing arrangement according to the invention.

Diese Pressanordnung dient zur Entwässerung einer Faserstoffbahn 1, insbesondere einer Kartonbahn in einer Papiermaschine zur Herstellung derselben.This press arrangement is used for dewatering a fibrous web 1, in particular a cardboard web in a paper machine for the production of the same.

Dabei soll durch eine effiziente, aber dennoch volumenschonende Entwässerung der Faserstoffbahn 1 eine hohe Steifigkeit des Kartons erreicht werden. Außerdem erzeugt das glatte Transferband eine gute Kartonoberfläche, so dass eine meist nachfolgende Offestpresse entfallen kann.A high rigidity of the cardboard should be achieved by an efficient, but nevertheless volume-preserving dewatering of the fibrous web 1 . In addition, the smooth transfer belt creates a good carton surface, so that an offset press, which usually follows, can be omitted.

Nach der Blattbildung in einem Former wird die Faserstoffbahn 1 vom wasserdurchlässigen Formiersieb 22 an ein wasser- und lufdurchlässiges Entwässerungsband 4 der nachfolgenden Pressanordnung übergeben.After sheet formation in a former, the fibrous web 1 is transferred from the water-permeable forming fabric 22 to a water- and air-permeable dewatering belt 4 of the subsequent press arrangement.

Vor der Übergabe erfolgt allerdings noch eine Vorentwässerung der Faserstoffbahn 1. Hierzu wird das Formiersieb 22 gemeinsam mit einem wasseraufnehmenden Entwässerungsband 23 sowie der dazwischenliegenden Faserstoffbahn 1 durch einen von zwei Presswalzen 24,25 gebildeten Vor-Pressspalt 10 geführt.Before the transfer, however, the fibrous web 1 is pre-dewatered. For this purpose, the forming fabric 22 is guided together with a water-absorbing dewatering belt 23 and the fibrous web 1 lying in between through a pre-press nip 10 formed by two press rollers 24,25.

Das die Faserstoffbahn 1 vom Formiersieb 22 übernehmende Entwässerungsband 4 ist über dieser angeordnet und führt die Faserstoffbahn 1 gemeinsam mit einem unter der Faserstoffbahn 1 laufenden Entwässerungsband 19 durch einen ersten Pressspalt 11. Dabei wird der erste Pressspalt 11 von einer unteren zylindrischen Presswalze 20 und einer darüber liegenden Saugwalze 2 gebildet. Die Presswalze 20 kann aber auch eine Schuh-Presswalze sein.The dewatering belt 4 that takes over the fibrous web 1 from the forming fabric 22 is arranged above it and guides the fibrous web 1 together with a dewatering belt 19 running under the fibrous web 1 through a first press nip 11. The first press nip 11 is formed by a lower cylindrical press roller 20 and one above it lying suction roll 2 formed. However, the press roll 20 can also be a shoe press roll.

Wegen des hohen Feuchtegehaltes der Faserstoffbahn 1 genügen dabei relativ geringe Presskräfte, wobei das anfallende Wasser über die Entwässerungsbander 4,19 sowie die Saugwalze 2 abgeführt wird.Because of the high moisture content of the fibrous web 1, relatively low pressing forces are sufficient, with the water that occurs being discharged via the dewatering belts 4, 19 and the suction roller 2.

Nach dem ersten Pressspalt 11 erfolgt eine Aufheizung der Faserstoffbahn 1 mittels Dampfbeaufschlagung über einen Dampfblaskasten 9 im Umschlingungsbereich der Saugwalze 2, was die Entwässerung der Faserstoffbahn 1 fördert.After the first press nip 11, the fibrous web 1 is heated by means of steam being applied via a steam blower box 9 in the wrap area of the suction roll 2, which promotes the dewatering of the fibrous web 1.

Danach wird die Faserstoffbahn 1 vom oberen Entwässerungsband 4 an ein unter der Faserstoffbahn 1 angeordnetes, wasserundurchlässiges und glattes Transferband 6 übergeben. Hierzu werden das Entwässerungsband 4, das Transferband 6 und die dazwischenliegende Faserstoffbahn 1 durch einen Übergabe-Pressspalt 12 geführt, der von der Saugwalze 2 und einer zylindrischen Presswalze 7 gebildet wird.Thereafter, the fibrous web 1 is transferred from the upper dewatering belt 4 to a water-impermeable and smooth transfer belt 6 arranged under the fibrous web 1 . For this purpose, the dewatering belt 4 , the transfer belt 6 and the fibrous web 1 lying between them are guided through a transfer press nip 12 which is formed by the suction roll 2 and a cylindrical press roll 7 .

Dieses Transferband 6 führt die obenliegende Faserstoffbahn 1 um eine, unter dem Transferband 6 rotierende Zentralwalze 3 und übergibt diese nach der Umschlingung der Zentralwalze 3 an ein oberes, endlos umlaufendes und luftdurchlässiges Trockensieb 21 einer folgenden Trockeneinheit der Papiermaschine.This transfer belt 6 guides the fibrous web 1 lying on top around a central roller 3 rotating under the transfer belt 6 and, after being wrapped around the central roller 3, transfers it to an upper, endlessly circulating and air-permeable drying fabric 21 of a following drying unit of the paper machine.

Die folgende Trockeneinheit wird von einer Trockengruppe gebildet, in der die Faserstoffbahn 1 zur Trocknung vom Trockensieb 21 gestützt, abwechselnd über beheizte Trockenzylinder 26 und Leitwalzen 27 geführt wird.The following drying unit is formed by a drying group in which the fibrous web 1 is supported by the drying fabric 21 for drying and is guided alternately over heated drying cylinders 26 and guide rollers 27 .

Damit ist die Faserstoffbahn 1 zwischen dem Former und der Trockeneinheit ständig von zumindest einem Band 4,6 geführt, was die Bahnführung auch bei hohen Maschinengeschwindigkeiten und hohen Flächengewichten der Faserstoffbahn 1 sehr stabil macht.Thus, the fibrous web 1 is constantly guided between the former and the drying unit by at least one belt 4.6, which makes the web run very stable even at high machine speeds and high basis weights of the fibrous web 1.

Der lichte Abstand zwischen der Saugwalze 2 und der Zentralwalze 3 liegt zwischen 250 und 2.000 mm. Durch die Entkopplung beider Walzen 2,3 vereinfacht sich der Aufbau der Pressanordnung erheblich. Der Abstand ist insbesondere auch deshalb erforderlich, weil ein Kontakt der Zentralwalze 3 mit der Saugwalze 2 wegen der Presswalze 7 nicht realisierbar ist.The clearance between the suction roll 2 and the central roll 3 is between 250 and 2,000 mm. The decoupling of both rollers 2.3 simplifies the construction of the press arrangement considerably. The distance is also necessary in particular because contact between the central roller 3 and the suction roller 2 cannot be achieved because of the press roller 7 .

Um die Faserstoffbahn 1 zwischen der Saugwalze 2 und der Zentralwalze 3 sicher auf dem Transferband 6 zu führen, verläuft das Transferband 6 in diesem Abschnitt senkrecht oder wie in der Figur dargestellt leicht in Maschinenlaufrichtung zur Senkrechten geneigt.In order to reliably guide the fibrous web 1 between the suction roller 2 and the central roller 3 on the transfer belt 6, the transfer belt 6 runs perpendicularly in this section or, as shown in the figure, slightly in the machine direction perpendicular inclined.

Außerdem wird die Faserstoffbahn 1 zwischen dem Übergabe-Pressspalt 12 und der Zentralwalze 3 nochmals von einem Dampfblaskasten 8 mit Dampf beaufschlagt.In addition, the fibrous web 1 between the transfer press nip 12 and the central roller 3 is again subjected to steam from a steam blower box 8 .

Die zylindrische Zentralwalze 3 ist mit einen Durchmesser von über 160 cm relativ groß, so dass im Umschlingungsbereich des Transferbandes 6 mit der außenliegenden Faserstoffbahn 1 zwei weitere Pressspalte 13,14 gebildet werden können.With a diameter of more than 160 cm, the cylindrical central roller 3 is relatively large, so that two further press gaps 13, 14 can be formed in the area where the transfer belt 6 wraps around the outer fibrous web 1.

Dabei wird der in Bahnlaufrichtung 5 erste Pressspalt 13 zwischen der Zentralwalze 3 und einer von einem separaten Entwässerungsband 15 umschlungenen, zylindrischen Presswalze 17 gebildet.The first press nip 13 in the direction of web travel 5 is formed between the central roller 3 and a cylindrical press roller 17 around which a separate dewatering belt 15 is wrapped.

Der zweite darauf folgenden Pressspalt 14 ist verlängert ausgeführt. Hierbei wird eine, ebenfalls voneinem endlos umlaufenden Entwässerungband 16 umschlungene Schuh-Presswalze 18 gegen die Zentralwalze 3 gedrückt.The second subsequent press nip 14 is extended. Here, a shoe press roller 18 , also wrapped by an endlessly circulating dewatering belt 16 , is pressed against the central roller 3 .

Schuh-Presswalzen 18 bestehen in der Regel aus einem flexiblen Walzenmantel, der im Bereich des verlängerten Pressspaltes 14 über einen Anpressschuh mit konkaver Pressfläche läuft.Shoe press rollers 18 generally consist of a flexible roller shell that runs over a pressure shoe with a concave pressing surface in the area of the extended press nip 14 .

Die endlos umlaufenden Entwässerungsbänder 4,15,16,19,23 dienen zur Aufnahme und dem Abtransport des im jeweiligen Pressspalt 10,11,12,13,14 aus der Faserstoffbahn 1 ausgepressten Wassers und sind meist als Pressfilze ausgeführt.The endlessly revolving dewatering belts 4,15,16,19,23 are used for receiving and transporting away the water pressed out of the fibrous web 1 in the respective press nip 10,11,12,13,14 and are mostly designed as press felts.

Die Übernahme der Faserstoffbahn 1 wird oft von einer, vom übernehmenden Entwässerungsband 4 oder Trockensieb 21 umschlungenen, besaugten Leitwalze 28,29 unterstützt.The acquisition of the fibrous web 1 is often supported by a suction-controlled guide roller 28, 29 wrapped around the absorbing dewatering belt 4 or drying fabric 21.

Die besaugte Leitwalze 28,29 besitzt hierzu einen perforierten Walzenmantel, dessen Innenraum mit einer Unterdruckquelle verbunden ist.For this purpose, the evacuated guide roller 28,29 has a perforated roller shell, the interior of which is connected to a vacuum source.

Claims (13)

  1. Press arrangement for dewatering a paper, board, tissue or other fibrous web (1) in a machine for producing and/or finishing the same, having a suction roll (2) around which an endlessly circulating, water-absorbing and air-permeable dewatering belt (4) and the outer fibrous web (1) are wrapped, and a cylindrical central roll (3) which is wrapped in the web running direction (5) and is involved in forming at least one press nip (13, 14) with a smooth, endlessly circulating transfer belt (6), a smooth, endlessly circulating transfer belt (6) wraps around the cylindrical central roll (3), which is involved in the formation of at least one press nip (13, 14) with an endlessly circulating, water-absorbing dewatering belt (15, 16) wrapped around it, 16), wherein the transfer belt (6) takes over the fibrous web (1) from the dewatering belt (4) of the suction roll (2) and the suction roll (2) forms a transfer nip (12) with a transfer press roll (7), through which the dewatering belt (4) of the suction roll (2) and the transfer belt (6) run together with the fibrous web (1) lying therebetween, characterized in that the central roll (3) forms a press nip (13, 14) in each case with at least two press rolls (17, 18) looped around in each case by an endlessly circulating, water-absorbing dewatering belt (15, 16).
  2. Press arrangement according to claim 1, characterised in that the suction roll (2) and the central roll (3) are spaced apart from each other and the fibrous web (1) is guided from the transfer nip (12) to the central roll (3) solely by the transfer belt (6).
  3. Press arrangement according to claim 1 or 2, characterised in that the transfer belt (6) between the transfer press nip (12) and the central roller (3) runs vertically or inclined up to 35° to the vertical in the web running direction (5).
  4. Pressing arrangement according to one of the preceding claims, characterized in that
    the fibrous web (1) between the transfer press nip (12) and the central roll (3) is impinged with steam by a steam blow box (8).
  5. Pressing arrangement according to one of the preceding claims, characterized in that
    at least one press nip (13, 14) of the central roller (4) is extended.
  6. Pressing arrangement according to one of the preceding claims, characterized in that
    that both press nips (13, 14) of the central roller (3) are extended.
  7. Press arrangement according to one of the preceding claims, characterized in that
    the central roller (3) has a diameter of at least 100 cm, preferably at least 160 cm.
  8. Pressing arrangement according to one of the preceding claims, characterized in that
    the suction roller (2) forms a press nip (11), preferably the first press nip (11) of the press arrangement, with a press roller (20) looped around by an endlessly circulating, water-absorbing drainage belt (19).
  9. Pressing arrangement according to one of the preceding claims, characterized in that
    a steam blow box (9) is assigned to the fibrous web (1) in the wrap-around area of the suction roll (2) before the transfer press nip (12).
  10. Pressing arrangement according to one of the preceding claims, characterized in that
    the fibrous web (1) is transferred after the central roll (3) from the transfer belt (6) to an endlessly circulating belt, preferably an air-permeable drying wire (21) of a subsequent drying unit of the machine.
  11. Press arrangement according to one of the preceding claims, characterized in that
    the dewatering belt (4) of the suction roll (2) takes over the fibrous web (1) from an endlessly circulating belt, preferably a forming wire (22) of an upstream former for sheet formation.
  12. Press arrangement according to claim 10 or 11, characterised in that the fibrous web (1) is constantly guided by at least one belt (4,6) between the former and the drying unit.
  13. Pressing arrangement according to claim 11 or 12, characterized in that the forming fabric (22) is guided through a pre-press nip (10) together with an endlessly circulating, water-absorbing dewatering belt (23) and the fibrous web (1) lying therebetween before the fibrous web (1) is discharged.
EP17811885.7A 2016-12-05 2017-11-28 Pressing arrangement Active EP3548664B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016123433.8A DE102016123433B4 (en) 2016-12-05 2016-12-05 Press arrangement
PCT/EP2017/080668 WO2018104110A1 (en) 2016-12-05 2017-11-28 Pressing arrangement

Publications (2)

Publication Number Publication Date
EP3548664A1 EP3548664A1 (en) 2019-10-09
EP3548664B1 true EP3548664B1 (en) 2023-03-08

Family

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Application Number Title Priority Date Filing Date
EP17811885.7A Active EP3548664B1 (en) 2016-12-05 2017-11-28 Pressing arrangement

Country Status (5)

Country Link
EP (1) EP3548664B1 (en)
CN (1) CN109996922B (en)
DE (1) DE102016123433B4 (en)
FI (1) FI3548664T3 (en)
WO (1) WO2018104110A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022127695A1 (en) 2022-10-20 2024-02-29 Voith Patent Gmbh Machine and method for producing or treating a corrugated base paper web with shortened drying fabrics
DE102023101607A1 (en) 2023-01-24 2024-03-07 Voith Patent Gmbh Machine for producing or treating a fibrous web
DE102023101610A1 (en) 2023-01-24 2024-06-13 Voith Patent Gmbh Machine and method for producing or treating a fibrous web

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4483745A (en) * 1982-09-29 1984-11-20 Beloit Corporation Method and apparatus of sheet transfer using a nonporous smooth surfaced belt
FI82500C (en) * 1985-02-18 1991-03-11 Valmet Oy Press section with separate press nip in a paper machine
DE10210169A1 (en) 2002-03-07 2003-09-18 Voith Paper Patent Gmbh Press arrangement
DE102004021051B3 (en) * 2004-04-29 2005-11-10 Infineon Technologies Ag DRAM memory cell arrangement and operating method
DE102007021051A1 (en) * 2007-05-04 2008-11-06 Voith Patent Gmbh Press arrangement for dehydrating e.g. paper, has paper press roller wounded around over press gap of smooth transfer belt led away from web by press gap and transferred to air-permeable belt to unit
FI121146B (en) * 2008-06-19 2010-07-30 Metso Paper Inc Web forming machine and method in a web forming machine
BR112014013929B1 (en) * 2011-12-08 2022-01-04 Voith Patent Gmbh PRESS BELT AND MACHINE FOR MANUFACTURING CONTINUOUS SHEET OF FIBROUS MATERIAL ESPECIALLY TISSUE PAPER

Also Published As

Publication number Publication date
DE102016123433B4 (en) 2019-01-10
WO2018104110A1 (en) 2018-06-14
FI3548664T3 (en) 2023-06-05
EP3548664A1 (en) 2019-10-09
CN109996922A (en) 2019-07-09
CN109996922B (en) 2020-12-25
DE102016123433A1 (en) 2018-06-07

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