EP3464716A1 - Machine for dewatering and drying a fibrous web - Google Patents

Machine for dewatering and drying a fibrous web

Info

Publication number
EP3464716A1
EP3464716A1 EP17725974.4A EP17725974A EP3464716A1 EP 3464716 A1 EP3464716 A1 EP 3464716A1 EP 17725974 A EP17725974 A EP 17725974A EP 3464716 A1 EP3464716 A1 EP 3464716A1
Authority
EP
European Patent Office
Prior art keywords
fibrous web
belt
drying
press
machine
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.)
Granted
Application number
EP17725974.4A
Other languages
German (de)
French (fr)
Other versions
EP3464716B1 (en
Inventor
Herr Daniel GRONYCH
Thomas RÜHL
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
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Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP3464716A1 publication Critical patent/EP3464716A1/en
Application granted granted Critical
Publication of EP3464716B1 publication Critical patent/EP3464716B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/32—Washing wire-cloths or felts
    • 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
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • D21F1/74—Pulp catching, de-watering, or recovering; Re-use of pulp-water using cylinders
    • D21F1/76—Pulp catching, de-watering, or recovering; Re-use of pulp-water using cylinders with suction
    • 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
    • D21F7/04—Paper-break control devices

Definitions

  • the invention relates to a machine for dewatering and drying a paper, cardboard or other fibrous web, which is fed to a pulp suspension formed at least partially from waste paper, with at least two press nips, which are formed by two compressed press rolls, wherein the fibrous web with both sides one water-absorbing dewatering band runs through the first and at least one other dewatering belt through the second press nip, and a smooth impermeable transfer belt is passed through the second press nip on the side of the fibrous web opposite the other dewatering belt, which passes the fibrous web to a belt after the second press nip passes the following machine unit.
  • the fibrous webs produced therefrom lead to a greater contamination of the elements coming into contact therewith, especially if these elements have a relatively high adhesion, in particular a smooth surface.
  • the two press nips often have two separate dewatering belts, so that the fibrous web can be safely guided between the two.
  • this is then also associated with a high rewetting of the fibrous web after the press nip.
  • the problem here is the transfer of the fibrous web by means of open train, especially at high machine speeds and the costly transfer.
  • the object of the invention is therefore to simplify the transfer at as intensive as possible dewatering of the fibrous web, secure web run and the lowest possible rewet.
  • the object is achieved in that the transfer belt passes under the fibrous web, the receiving belt is a dryer and the following machine unit is a dryer group in which the fibrous web is meandering, alternately heated by heated drying cylinders and suctioned guide rollers and one, preferably the first drying cylinder at least one pick-up scraper is associated with the following drying group, there being a pulper under the pick-up scraper and the axis of the drying cylinder with the pick-up scraper and the axis of the following swept guide roll being vertically offset from each other and spaced horizontally apart; which is greater than 80% of the sum of the radii of this drying cylinder and this guide roll.
  • the fibrous web is constantly guided by at least one band in the press section, the web guide is very stable even at high machine speeds.
  • the transfer can be done web width through the press section at least to the first drying cylinder of the following drying group, which also makes this very safe.
  • a transfer only to the end of the press section is problematic because the decrease in the fibrous web from the transfer belt by means of removal scraper can easily cause damage to the transfer belt because of the required contact pressure.
  • the fibrous web adheres to the smooth transfer belt, so that the opposite relatively rough dewatering belt can be carried away immediately, at most 200 mm after this press nip without problems and a rewet is prevented.
  • the transfer belt then guides the web safely to the belt of the following machine unit. Subsequently, the transfer belt is cleaned by a cleaning device which directs a cleaning fluid with a pressure of at least 50 bar on the fibrous web-carrying side and at least one, subsequent scraper comprises.
  • the cleaning device even directs the cleaning fluid with a pressure of at least 100 bar, preferably at least 120 bar on the fibrous web leading side of the transfer belt.
  • the transfer belt should be supported in the area of the cleaning device on at least one guide roller.
  • the extended press nip is formed by a cylindrical press roll and a shoe press roll, which has a flexible roll shell, which is pressed by a pressure shoe with concave pressing surface to the cylindrical roll.
  • the extended press nip extends at least over 250 mm in the machine direction and / or has a line force of at least 800 kN / m.
  • the transfer belt should run below the fibrous web. This results in a sufficient adhesion of the fibrous web to the transfer belt, if this on the fibrous web leading side has a roughness R z in the machine direction of less than 12, preferably less than 10 and in particular less than 8 ⁇ .
  • the distance between the second press nip and the delivery of the fibrous web to the receiving band should be shorter than 2.5 m, preferably shorter than 2 m and in particular shorter than 1.5 m.
  • the fibrous web is guided at least before the first, preferably before each press nip over the longest possible guide distance of both bands of the respective press nip.
  • the upper dewatering belt of the first press nip should be led away from the fibrous web during aspiration of the lower dewatering belt.
  • the figure shows a schematic cross section through part of a paper machine with press section and the following drying group for the production of packaging papers with a basis weight between 50 and 120 g / m 2 of a pulp suspension formed at least partially from waste paper.
  • the illustrated press section comprises two press nips 2, 3, which are formed by two compressed press rolls 4, 5, 6, 7, respectively.
  • the separate ones Press roller pairs are thereby supported at the ends of support parts in the form of a foundation, which is supported on the machine foundation.
  • press gaps 2, 3 are each formed by a cylindrical press roll 5, 7 and a shoe press roll 4, 6.
  • the shoe press rolls 4, 6 have a flexible roll shell, which is pressed by a contact shoe with a concave pressing surface to the cylindrical press roll 5, 7.
  • the aim is a length of the press nip 2,3 in the machine direction 16 of at least 250 mm and a line force of at least 800 kN / m.
  • the fibrous web 1 runs on both sides with a respective dewatering belt 8, 9.
  • the fibrous web 1 is guided by an upper dewatering belt 10 and a lower, smooth and impermeable transfer belt 11 through the second press nip 3.
  • the dewatering belts 8,9,10 are designed as water-absorbing press felts.
  • the upper dewatering belt 8 of the first press nip 2 takes over the fibrous web 1 from a forming wire 17 of an upstream former for sheet formation. Subsequently, the lower dewatering belt 9 is brought into contact with the fibrous web 1 so that the fibrous web 1 is guided in front of the first press nip 2 over as long a guide path as possible from both belts 8, 9 of the press nip 2.
  • the fibrous web 1 runs together with both dewatering belts 8, 9 before the upper dewatering belt 8 is led away.
  • the lower dewatering belt 9 is sucked in this area by a suction box 18 arranged underneath.
  • the fibrous web 1 is then transferred to the other, upper dewatering belt 10 of the second press nip 3.
  • the (other) upper dewatering belt 10 is led away from the fibrous web 1 after a maximum of 200 mm, which reduces the risk of rewet, in particular at low basis weights.
  • the lower transfer belt 1 1 leads the fibrous web 1 until it is transferred to a belt 12, here a drying wire of a following drying group with only three drying cylinders 19 a drying section for drying the fibrous web 1, alone.
  • the fibrous web 1 is supported by the dryer fabric, meandering alternately over heated drying cylinders 19 and evacuated guide rollers 20 out.
  • the first drying cylinder 19 of the following drying group is associated with a removal scraper 24. This separates the fibrous web 1 during transfer from the drying cylinder 19 and then passes this into a pulper 23 located underneath.
  • the axis of the first drying cylinder 19 with the removal scraper 24 and the axis of the following, evacuated guide roll 20 are vertically offset from one another.
  • these axes have a horizontal distance 22 from each other, which is greater than 95% of the sum of the two radii of this drying cylinder 19 and this guide roller 20 here.
  • the upper dewatering belts 8, 10 and the drying wire each wrap around an evacuated guide roller 21 during the takeover of the fibrous web 1.
  • the transfer belt 1 1 is cleaned intensively after the delivery of the fibrous web 1 by a cleaning device 13.
  • This cleaning device 13 directs a cleaning fluid, here water at a pressure of at least 100 bar on the fibrous web-carrying side of the transfer belt 1 first Thereafter, the dissolved impurities are removed from a subsequent scraper 14 from the transfer belt 1 1.
  • a cleaning fluid here water at a pressure of at least 100 bar
  • the transfer belt 1 1 is supported in the region of the cleaning device 13 and the scraper 14 on at least one guide roller 15.

Landscapes

  • Paper (AREA)

Abstract

The invention relates to a machine for dewatering and drying a paper, cardboard or other fibrous web (1), to which machine a fibrous stock suspension which is formed at least partially from waste paper is fed, having at least two pressure nips (2, 3) which are formed by in each case two press rolls (4, 5, 6, 7), wherein the fibrous web (1) with in each case one water-absorbing dewatering belt (8, 9) on both sides runs through the second pressure nip (3) through the first (2) and at least one other dewatering belt (10), and a smooth impermeable transfer belt (11) is guided through the second pressure nip (3) on that side of the fibrous web (1) which lies opposite the other dewatering belt (10), which transfer belt (11) transfers the fibrous web (1) downstream of the second pressure nip (3) to a belt (12) of a following machine unit. Here, a reliable web-wide transfer is to be made possible by virtue of the fact that the transfer belt (11) runs under the fibrous web (1), the receiving belt (12) is a dryer fabric, and the following machine unit is a drying group, in which the fibrous web (1) is guided in a serpentine-shaped manner over heated drying cylinders (19) and evacuated guiding rollers (20) in an alternating way, and a drying cylinder (19) of the following drying group is assigned at least one removal doctor (24), wherein a pulper (23) is situated under the removal doctor (24), and the axis of the drying cylinder (19) with the removal doctor (24) and the axis of the following, evacuated guiding roller (20) are offset vertically with respect to one another and are at a horizontal spacing (22) from one another which is greater than 80% of the sum of the radii of said drying cylinder (19) and said guiding roller (20).

Description

MASCHINE ZUR ENTWÄSSERUNG UND TROCKNUNG EINER FASERSTOFFBAHN  MACHINE FOR DRAINING AND DRYING A FIBROUS WEB
Die Erfindung betrifft eine Maschine zur Entwässerung und Trocknung einer Papier-, Karton- oder einer anderen Faserstoffbahn, welcher eine zumindest teilweise aus Altpapier gebildete Faserstoffsuspension zugeführt wird, mit mindestens zwei Pressspalten, die von jeweils zwei zusammengedrückten Presswalzen gebildet werden, wobei die Faserstoffbahn mit beidseitig je einem wasseraufnehmenden Entwässerungsband durch den ersten und wenigstens einem anderen Entwässerungsband durch den zweiten Pressspalt läuft und auf der, dem anderen Entwässerungsband gegenüberliegenden Seite der Faserstoffbahn ein glattes impermeables Transferband durch den zweiten Pressspalt geführt wird, welches die Faserstoffbahn nach dem zweiten Pressspalt an ein Band einer folgenden Maschineneinheit übergibt. The invention relates to a machine for dewatering and drying a paper, cardboard or other fibrous web, which is fed to a pulp suspension formed at least partially from waste paper, with at least two press nips, which are formed by two compressed press rolls, wherein the fibrous web with both sides one water-absorbing dewatering band runs through the first and at least one other dewatering belt through the second press nip, and a smooth impermeable transfer belt is passed through the second press nip on the side of the fibrous web opposite the other dewatering belt, which passes the fibrous web to a belt after the second press nip passes the following machine unit.
Derartige Anlagen sind seit langem bekannt, wobei die aus Altpapier hergestellten Faserstoffsuspensionen einen erhöhten Anteil an Verunreinigungen aufweisen. Such systems have long been known, the pulp suspensions made from waste paper having an increased content of impurities.
Dementsprechend führen die daraus hergestellten Faserstoffbahnen zu einer stärkeren Verschmutzung der damit in Kontakt kommenden Elemente, insbesondere wenn diese Elemente eine relativ hohe Adhäsion, insbesondere eine glatte Oberfläche haben. Accordingly, the fibrous webs produced therefrom lead to a greater contamination of the elements coming into contact therewith, especially if these elements have a relatively high adhesion, in particular a smooth surface.
Aus diesem Grund besitzen die beiden Pressspalte häufig zwei separate Entwässerungsbänder, so dass die Faserstoffbahn sicher zwischen den beiden geführt werden kann. Allerdings ist dies dann auch mit einer hohen Rückbefeuchtung der Faserstoffbahn nach dem Pressspalt verbunden.  For this reason, the two press nips often have two separate dewatering belts, so that the fibrous web can be safely guided between the two. However, this is then also associated with a high rewetting of the fibrous web after the press nip.
Zur Minderung dieser Rückbefeuchtung ist es auch bekannt, durch den zweiten Pressspalt nur ein, meist oberes Entwässerungsband zu führen. Die Faserstoffbahn haftet dann nach dem zweiten Pressspalt an der glatten Manteloberfläche der entsprechenden Presswalze und wird dann mit offenem Zug an ein Band einer folgenden Trockengruppe übergeben. To reduce this rewet, it is also known to lead through the second press nip only one, usually upper dewatering belt. The fibrous web then adheres after the second press nip to the smooth shell surface of the corresponding press roll and is then transferred by open draw to a belt of a following dryer group.
Problematisch sind hierbei die Übergabe der Faserstoffbahn mittels offenem Zug besonders bei hohen Maschinengeschwindigkeiten und das aufwändige Überführen. Die Aufgabe der Erfindung ist es daher das Überführen bei möglichst intensiver Entwässerung der Faserstoffbahn, sicherem Bahnlauf und möglichst geringer Rückbefeuchtung zu vereinfachen. Erfindungsgemäß wurde die Aufgabe dadurch gelöst, dass das Transferband unter der Faserstoffbahn verläuft, das übernehmende Band ein Trockensieb und die folgende Maschineneinheit eine Trockengruppe ist, in der die Faserstoffbahn mäanderförmig, abwechselnd über beheizte Trockenzylinder und besaugte Leitwalzen geführt wird und einem, vorzugsweise dem ersten Trockenzylinder der folgenden Trockengruppe wenigstens ein Abnahme-Schaber zugeordnet ist, wobei sich unter dem Abnahme-Schaber ein Pulper befindet und die Achse des Trockenzylinders mit dem Abnahme-Schaber und die Achse der folgenden, besaugten Leitwalze vertikal zueinander versetzt sind und einen horizontalen Abstand voneinander haben, der größer als 80% der Summe der Radien dieses Trockenzylinders und dieser Leitwalze ist. The problem here is the transfer of the fibrous web by means of open train, especially at high machine speeds and the costly transfer. The object of the invention is therefore to simplify the transfer at as intensive as possible dewatering of the fibrous web, secure web run and the lowest possible rewet. According to the invention, the object is achieved in that the transfer belt passes under the fibrous web, the receiving belt is a dryer and the following machine unit is a dryer group in which the fibrous web is meandering, alternately heated by heated drying cylinders and suctioned guide rollers and one, preferably the first drying cylinder at least one pick-up scraper is associated with the following drying group, there being a pulper under the pick-up scraper and the axis of the drying cylinder with the pick-up scraper and the axis of the following swept guide roll being vertically offset from each other and spaced horizontally apart; which is greater than 80% of the sum of the radii of this drying cylinder and this guide roll.
Da die Faserstoffbahn in der Pressenpartie ständig von wenigstens einem Band geführt wird, ist die Bahnführung auch bei hohen Maschinengeschwindigkeiten sehr stabil. Außerdem kann so das Überführen bahnbreit durch die Pressenpartie zumindest bis zum ersten Trockenzylinder der folgenden Trockengruppe erfolgen, was dies ebenfalls sehr sicher macht. Since the fibrous web is constantly guided by at least one band in the press section, the web guide is very stable even at high machine speeds. In addition, so the transfer can be done web width through the press section at least to the first drying cylinder of the following drying group, which also makes this very safe.
Ein Überführen nur bis zum Ende der Pressenpartie ist problematisch, da die Abnahme der Faserstoffbahn vom Transferband mittels Abnahmeschaber wegen des dabei erforderlichen Anpressdruckes leicht zur Beschädigung des Transferbandes führen kann.  A transfer only to the end of the press section is problematic because the decrease in the fibrous web from the transfer belt by means of removal scraper can easily cause damage to the transfer belt because of the required contact pressure.
Der horizontale Abstand zwischen den Achsen schafft genug Raum für den Pulper und um die Faserstoffbahn beim Überführen stabil und sicher vom Abnahmeschaber in diesen, darunter angeordneten Pulper abzuführen. Damit sinkt auch die Gefahr, dass die Faserstoffbahn beim Überführen nicht in den Pulper sondern am Trockenzylinder oder dem Trockensieb weitergeführt wird und dabei Schaden an Maschinenelementen verursacht. Dabei ist es von Vorteil, wenn die Achse des Trockenzylinders mit dem Abnahme- Schaber und die Achse der folgenden, besaugten Leitwalze sogar einen horizontalen Abstand voneinander haben, der größer als 90% und insbesondere größer als 95% der Summe der Radien dieses Trockenzylinders und dieser Leitwalze ist. The horizontal distance between the axles creates enough room for the pulper and to discharge the fibrous web stably and safely from the take-off scraper into the pulp below it during transfer. This also reduces the risk that the fibrous web will not continue to be transferred to the pulper but rather to the drying cylinder or the dryer fabric during transfer, thereby causing damage to machine elements. It is advantageous if the axis of the drying cylinder with the decrease scraper and the axis of the following, suctioned guide roll even have a horizontal distance from each other, which is greater than 90% and in particular greater than 95% of the total of the radii of this drying cylinder and this Guide roll is.
Nach dem zweiten Pressspalt haftet die Faserstoffbahn am glatten Transferband, so dass das gegenüberliegende relativ raue Entwässerungsband unmittelbar, höchstens 200 mm nach diesem Pressspalt problemlos weggeführt werden kann und eine Rückbefeuchtung verhindert wird. After the second press nip the fibrous web adheres to the smooth transfer belt, so that the opposite relatively rough dewatering belt can be carried away immediately, at most 200 mm after this press nip without problems and a rewet is prevented.
Das Transferband führt die Bahn anschließend sicher zum Band der folgenden Maschineneinheit. Anschließend wird das Transferband von einer Reinigungsvorrichtung gereinigt, die ein Reinigungsfluid mit einem Druck von mindestens 50 bar auf die faserstoffbahnführende Seite richtet und mindestens einen, darauf folgenden Schaber umfasst. The transfer belt then guides the web safely to the belt of the following machine unit. Subsequently, the transfer belt is cleaned by a cleaning device which directs a cleaning fluid with a pressure of at least 50 bar on the fibrous web-carrying side and at least one, subsequent scraper comprises.
Hierbei kann es vorteilhaft sein, wenn die Reinigungsvorrichtung das Reinigungsfluid sogar mit einem Druck von mindestens 100 bar, vorzugsweise mit wenigstens 120 bar auf die faserstoffbahnführende Seite des Transferbandes richtet. It may be advantageous if the cleaning device even directs the cleaning fluid with a pressure of at least 100 bar, preferably at least 120 bar on the fibrous web leading side of the transfer belt.
Wegen des hohen Druckes und zur Gewährleistung eines ausreichenden Kontakts mit dem Schaber sollte sich das Transferband im Bereich der Reinigungsvorrichtung auf mindestens einer Leitwalze abstützen. Because of the high pressure and to ensure sufficient contact with the scraper, the transfer belt should be supported in the area of the cleaning device on at least one guide roller.
Im Interesse einer intensiven und dennoch volumenschonenden Entwässerung sollte wenigstens ein, vorzugsweise beide Pressspalte verlängert ausgebildet sein. Mit Vorteil wird der verlängerte Pressspalt dabei von einer zylindrischen Presswalze und einer Schuh-Presswalze gebildet wird, die einen flexiblen Walzenmantel besitzt, welcher von einem Anpressschuh mit konkaver Pressfläche zur zylindrischen Walze gedrückt wird. In the interest of intensive, yet volume-saving drainage, at least one, preferably both press nips should be formed extended. Advantageously, the extended press nip is formed by a cylindrical press roll and a shoe press roll, which has a flexible roll shell, which is pressed by a pressure shoe with concave pressing surface to the cylindrical roll.
Dabei hat es sich als optimal erwiesen, wenn sich der verlängerte Presspalt zumindest über 250 mm in Maschinenlaufrichtung erstreckt und/oder eine Linienkraft von wenigstens 800 kN/m aufweist. Zur sicheren Abstützung der Faserstoffbahn sollte das Transferband unter der Faserstoffbahn verlaufen. Dabei ergibt sich eine ausreichende Haftung der Faserstoffbahn am Transferband, wenn dieses auf der faserstoffbahnführenden Seite eine Rauigkeit Rz in Maschinenlaufrichtung von weniger als 12, vorzugsweise weniger als 10 und insbesondere weniger als 8 μιτι aufweist. It has proven to be optimal if the extended press nip extends at least over 250 mm in the machine direction and / or has a line force of at least 800 kN / m. For safe support of the fibrous web, the transfer belt should run below the fibrous web. This results in a sufficient adhesion of the fibrous web to the transfer belt, if this on the fibrous web leading side has a roughness R z in the machine direction of less than 12, preferably less than 10 and in particular less than 8 μιτι.
Des Weiteren sollte die Strecke zwischen dem zweiten Pressspalt und der Abgabe der Faserstoffbahn an das übernehmende Band kürzer als 2,5 m, vorzugsweise kürzer als 2 m und insbesondere kürzer als 1 ,5 m sein. Furthermore, the distance between the second press nip and the delivery of the fibrous web to the receiving band should be shorter than 2.5 m, preferably shorter than 2 m and in particular shorter than 1.5 m.
Um die Faserstoffbahn auch vor den Pressspalten sicher zu führen, ist es vorteilhaft, wenn die Faserstoffbahn zumindest vor dem ersten, vorzugsweise vor jedem Pressspalt über eine möglichst lange Führungsstrecke von beiden Bändern des jeweiligen Pressspaltes geführt wird. In order to safely guide the fibrous web before the press nips, it is advantageous if the fibrous web is guided at least before the first, preferably before each press nip over the longest possible guide distance of both bands of the respective press nip.
Da die Faserstoffbahn nach dem ersten Pressspalt mit etwa gleicher Stärke an beiden Entwässerungsbändern haftet, sollte das obere Entwässerungsband des ersten Pressspaltes während einer Besaugung des unteren Entwässerungsbandes von der Faserstoffbahn weggeführt werden. Since the fibrous web adheres to both dewatering belts after the first press nip with approximately equal thickness, the upper dewatering belt of the first press nip should be led away from the fibrous web during aspiration of the lower dewatering belt.
Besondere Vorteile ergeben sich bei der Nutzung dieser Erfindung in einer Maschine zur Herstellung einer Faserstoffbahn mit einem Flächengewicht zwischen 50 und 180, vorzugsweise zwischen 50 und 120 g/m2. Particular advantages arise in the use of this invention in a machine for producing a fibrous web having a basis weight between 50 and 180, preferably between 50 and 120 g / m 2 .
Nachfolgend soll die Erfindung an einem Ausführungsbeispiel näher erläutert werden. In der beigefügten Zeichnung zeigt die Figur einen schematischen Querschnitt durch einen Teil einer Papiermaschine mit Pressenpartie und folgender Trockengruppe zur Herstellung von Verpackungspapieren mit einem Flächengewicht zwischen 50 und 120 g/m2 aus einer zumindest teilweise aus Altpapier gebildeten Faserstoffsuspension . The invention will be explained in more detail with reference to an exemplary embodiment. In the accompanying drawing, the figure shows a schematic cross section through part of a paper machine with press section and the following drying group for the production of packaging papers with a basis weight between 50 and 120 g / m 2 of a pulp suspension formed at least partially from waste paper.
Die dargestellte Presspartie umfasst zwei Pressspalte 2,3, die von jeweils zwei zusammengedrückten Presswalzen 4,5,6,7 gebildet werden. Die separaten Presswalzen-Paare werden dabei an den Enden von Supportteilen in Form eines Fundamentes, welches sich auf dem Maschinenfundament abstützt, getragen. The illustrated press section comprises two press nips 2, 3, which are formed by two compressed press rolls 4, 5, 6, 7, respectively. The separate ones Press roller pairs are thereby supported at the ends of support parts in the form of a foundation, which is supported on the machine foundation.
Für eine schonende Entwässerung sind beide Pressspalte 2,3 verlängert ausgebildet sind. Hierzu werden die Pressspalte 2,3 jeweils von einer zylindrischen Presswalze 5,7 und einer Schuh-Presswalze 4,6 gebildet. For gentle drainage both press nips are 2.3 formed extended. For this purpose, the press gaps 2, 3 are each formed by a cylindrical press roll 5, 7 and a shoe press roll 4, 6.
Die Schuh-Presswalzen 4,6 besitzen einen flexiblen Walzenmantel, der von einem Anpressschuh mit konkaver Pressfläche zur zylindrischen Presswalze 5,7 gedrückt wird. Angestrebt wird dabei eine Länge des Pressspaltes 2,3 in Maschinenlaufrichtung 16 von zumindest 250 mm und eine Linienkraft von wenigstens 800 kN/m.  The shoe press rolls 4, 6 have a flexible roll shell, which is pressed by a contact shoe with a concave pressing surface to the cylindrical press roll 5, 7. The aim is a length of the press nip 2,3 in the machine direction 16 of at least 250 mm and a line force of at least 800 kN / m.
Durch den ersten Pressspalt 2 läuft die Faserstoffbahn 1 mit beidseitig je einem Entwässerungsband 8,9. Im Gegensatz dazu wird die Faserstoffbahn 1 von einem oberen Entwässerungsband 10 und einem unteren, glatten und impermeablen Transferband 1 1 durch den zweiten Pressspalt 3 geführt. Through the first press nip 2, the fibrous web 1 runs on both sides with a respective dewatering belt 8, 9. In contrast, the fibrous web 1 is guided by an upper dewatering belt 10 and a lower, smooth and impermeable transfer belt 11 through the second press nip 3.
Dabei sind die Entwässerungsbänder 8,9,10 als wasseraufnehmende Pressfilze ausgeführt.  The dewatering belts 8,9,10 are designed as water-absorbing press felts.
Das obere Entwässerungsband 8 des ersten Pressspaltes 2 übernimmt die Faserstoffbahn 1 von einem Formersieb 17 eines vorgelagerten Formers zur Blattbildung. Anschließend wird auch das untere Entwässerungsband 9 mit der Faserstoffbahn 1 in Kontakt gebracht, so dass die Faserstoffbahn 1 vor dem ersten Pressspalt 2 über eine möglichst lange Führungsstrecke von beiden Bändern 8,9 des Pressspaltes 2 geführt wird.  The upper dewatering belt 8 of the first press nip 2 takes over the fibrous web 1 from a forming wire 17 of an upstream former for sheet formation. Subsequently, the lower dewatering belt 9 is brought into contact with the fibrous web 1 so that the fibrous web 1 is guided in front of the first press nip 2 over as long a guide path as possible from both belts 8, 9 of the press nip 2.
Nach dem ersten Pressspalt 2 läuft die Faserstoffbahn 1 gemeinsam mit beiden Entwässerungsbändern 8,9, bevor das obere Entwässerungsband 8 weggeführt wird. Um während der Wegführung des oberen Entwässerungsbandes 8 eine sichere Führung der Faserstoffbahn 1 gewährleisten zu können, wird das untere Entwässerungsband 9 in diesem Bereich von einem darunter angeordneten Saugkasten 18 besaugt. Von dem allein führenden unteren Entwässerungsband 9 wird die Faserstoffbahn 1 dann an das andere, obere Entwässerungsband 10 des zweiten Pressspaltes 3 übergeben. Nach dem zweiten Pressspalt 3 wird das (andere) obere Entwässerungsband 10 nach höchstens 200 mm von der Faserstoffbahn 1 weggeführt, was die Gefahr einer Rückbefeuchtung insbesondere bei geringen Flächengewichten mindert. After the first press nip 2, the fibrous web 1 runs together with both dewatering belts 8, 9 before the upper dewatering belt 8 is led away. In order to ensure safe guidance of the fibrous web 1 during the routing of the upper dewatering belt 8, the lower dewatering belt 9 is sucked in this area by a suction box 18 arranged underneath. From the sole leading lower dewatering belt 9, the fibrous web 1 is then transferred to the other, upper dewatering belt 10 of the second press nip 3. After the second press nip 3, the (other) upper dewatering belt 10 is led away from the fibrous web 1 after a maximum of 200 mm, which reduces the risk of rewet, in particular at low basis weights.
Danach führt das untere Transferband 1 1 die Faserstoffbahn 1 bis zur Übergabe an ein Band 12, hier ein Trockensieb einer folgenden Trockengruppe mit nur drei Trockenzylindern 19 einer Trockenpartie zur Trocknung der Faserstoffbahn 1 , allein. Thereafter, the lower transfer belt 1 1 leads the fibrous web 1 until it is transferred to a belt 12, here a drying wire of a following drying group with only three drying cylinders 19 a drying section for drying the fibrous web 1, alone.
In der Trockengruppe wird die Faserstoffbahn 1 vom Trockensieb gestützt, mäanderförmig abwechselnd über beheizte Trockenzylinder 19 und besaugte Leitwalzen 20 geführt. In the dryer group, the fibrous web 1 is supported by the dryer fabric, meandering alternately over heated drying cylinders 19 and evacuated guide rollers 20 out.
Dabei ist dem ersten Trockenzylinder 19 der folgenden Trockengruppe ein Abnahme- Schaber 24 zugeordnet. Dieser trennt die Faserstoffbahn 1 beim Überführen vom Trockenzylinder 19 und leitet diese dann in einen darunter befindlichen Pulper 23. In this case, the first drying cylinder 19 of the following drying group is associated with a removal scraper 24. This separates the fibrous web 1 during transfer from the drying cylinder 19 and then passes this into a pulper 23 located underneath.
Um dies beim bahnbreiten Überführen der Faserstoffbahn 1 sicher und stabil zu gestalten, sind die Achse des ersten Trockenzylinders 19 mit dem Abnahme-Schaber 24 und die Achse der folgenden, besaugten Leitwalze 20 vertikal zueinander versetzt. Darüber hinaus haben diese Achsen einen horizontalen Abstand 22 voneinander, der hier größer als 95% der Summe der beiden Radien dieses Trockenzylinders 19 und dieser Leitwalze 20 ist. In order to make this safe and stable during the web-width transfer of the fibrous web 1, the axis of the first drying cylinder 19 with the removal scraper 24 and the axis of the following, evacuated guide roll 20 are vertically offset from one another. In addition, these axes have a horizontal distance 22 from each other, which is greater than 95% of the sum of the two radii of this drying cylinder 19 and this guide roller 20 here.
Die oberen Entwässerungsbänder 8,10 sowie das Trockensieb umschlingen während der Übernahme der Faserstoffbahn 1 jeweils eine besaugte Leitwalze 21 . The upper dewatering belts 8, 10 and the drying wire each wrap around an evacuated guide roller 21 during the takeover of the fibrous web 1.
Im Interesse eines sicheren Bahnlaufs insbesondere bei Flächengewichten zwischen 50 und 120 g/m2 und/oder Maschinengeschwindigkeiten von mehr als 1 .000 m/min ist die Strecke zwischen dem zweiten Pressspalt 3 und der Abgabe der Faserstoffbahn 1 an das übernehmende Trockensieb kürzer als 1 ,5 m. Dabei sorgt eine relativ glatte Oberfläche des Transferbandes 1 1 mit einer Rauigkeit Rz in Maschinenlaufrichtung 16 von weniger als 10 μιτι auf der faserstoffbahnführenden Seite für eine ausreichende Haftung der Faserstoffbahn 1 am Transferband 1 1 . In the interest of a secure web run especially at basis weights between 50 and 120 g / m 2 and / or machine speeds of more than 1, 000 m / min the distance between the second press nip 3 and the delivery of the fibrous web 1 to the acquiring drying wire shorter than 1, 5 m. In this case, a relatively smooth surface of the transfer belt 1 1 with a roughness R z in the machine direction 16 of less than 10 μιτι on the fibrous web leading side ensures sufficient adhesion of the fibrous web 1 on the transfer belt 1 first
Auf Grund ihres hohen Anteils an Verunreinigungen ist durch den Kontakt der Faserstoffbahn 1 mit dem Transferband 1 1 mit einer relativ starken Verschmutzung desselben zu rechnen. Due to their high proportion of impurities is to be expected by the contact of the fibrous web 1 with the transfer belt 1 1 with a relatively strong pollution thereof.
Um dennoch einen möglichst langen und zuverlässigen Betrieb zu ermöglichen, wird das Transferband 1 1 nach der Abgabe der Faserstoffbahn 1 von einer Reinigungsvorrichtung 13 intensiv gereinigt. In order nevertheless to allow the longest possible and reliable operation, the transfer belt 1 1 is cleaned intensively after the delivery of the fibrous web 1 by a cleaning device 13.
Diese Reinigungsvorrichtung 13 richtet ein Reinigungsfluid, hier Wasser mit einem Druck von mindestens 100 bar auf die faserstoffbahnführende Seite des Transferbandes 1 1 . Danach werden die gelösten Verunreinigungen von einem folgenden Schaber 14 vom Transferband 1 1 entfernt.  This cleaning device 13 directs a cleaning fluid, here water at a pressure of at least 100 bar on the fibrous web-carrying side of the transfer belt 1 first Thereafter, the dissolved impurities are removed from a subsequent scraper 14 from the transfer belt 1 1.
Wegen des hohen Drucks stützt sich das Transferband 1 1 im Bereich der Reinigungsvorrichtung 13 sowie des Schabers 14 auf wenigstens einer Leitwalze 15 ab.  Because of the high pressure, the transfer belt 1 1 is supported in the region of the cleaning device 13 and the scraper 14 on at least one guide roller 15.

Claims

1 . Maschine zur Entwässerung und Trocknung einer zumindest teilweise aus Altpapier gebildeten Papier-, Karton- oder einer anderen Faserstoffbahn (1 ), mit mindestens zwei Pressspalten (2,3), die von jeweils zwei Presswalzen (4,5,6,7) gebildet werden, wobei die Faserstoffbahn (1 ) mit beidseitig je einem wasseraufnehmenden Entwässerungsband (8,9) durch den ersten (2) und wenigstens einem anderen Entwässerungsband (10) durch den zweiten Pressspalt (3) läuft und auf der, dem anderen Entwässerungsband (10) gegenüberliegenden Seite der Faserstoffbahn (1 ) ein glattes impermeables Transferband (1 1 ) durch den zweiten Pressspalt (3) geführt wird, welches die Faserstoffbahn (1 ) nach dem zweiten Pressspalt (3) an ein Band (12) einer folgenden Maschineneinheit übergibt, dadurch gekennzeichnet, dass das Transferband (1 1 ) unter der Faserstoffbahn (1 ) verläuft, das übernehmende Band (12) ein Trockensieb und die folgende Maschineneinheit eine Trockengruppe ist, in der die Faserstoffbahn (1 ) mäanderförmig, abwechselnd über beheizte Trockenzylinder (19) und besaugte Leitwalzen (20) geführt wird und einem Trockenzylinder (19) der folgenden Trockengruppe wenigstens ein Abnahme- Schaber (24) zugeordnet ist, wobei sich unter dem Abnahme-Schaber (24) ein Pulper (23) befindet und die Achse des Trockenzylinders (19) mit dem Abnahme- Schaber (24) und die Achse der folgenden, besaugten Leitwalze (20) vertikal zueinander versetzt sind und einen horizontalen Abstand (22) voneinander haben, der größer als 80% der Summe der Radien dieses Trockenzylinders (19) und dieser Leitwalze (20) ist. 1 . Machine for dewatering and drying a paper, cardboard or other fibrous web (1) formed at least partially from waste paper, with at least two press nips (2,3), each formed by two press rollers (4,5,6,7). , wherein the fibrous web (1) runs through the first (2) with a water-absorbing drainage belt (8,9) on both sides and at least one other drainage belt (10) through the second press nip (3) and on the other drainage belt (10) opposite side of the fibrous web (1), a smooth impermeable transfer belt (1 1) is guided through the second press nip (3), which transfers the fibrous web (1) after the second press nip (3) to a belt (12) of a following machine unit, thereby characterized in that the transfer belt (1 1) runs under the fibrous web (1), the receiving belt (12) is a drying fabric and the following machine unit is a drying group in which the fibrous web (1) meanders, alternating over heated drying cylinders (19) and vacuumed guide rollers (20) and at least one removal scraper (24) is assigned to a drying cylinder (19) of the following drying group, a pulper (23) being located under the removal scraper (24) and the axis of the drying cylinder (19 ) with the removal scraper (24) and the axis of the following, vacuumed guide roller (20) are vertically offset from one another and have a horizontal distance (22) from each other that is greater than 80% of the sum of the radii of this drying cylinder (19) and this Guide roller (20).
2. Maschine nach Anspruch 1 , dadurch gekennzeichnet, dass einem, vorzugsweise dem ersten Trockenzylinder (19) der folgenden Trockengruppe wenigstens ein Abnahme-Schaber (24) zugeordnet ist, wobei sich unter dem Abnahme-Schaber (24) ein Pulper (23) befindet und die Achse des Trockenzylinders (19) mit dem Abnahme-Schaber (24) und die Achse der folgenden, besaugten Leitwalze (20) vertikal zueinander versetzt sind und einen horizontalen Abstand (22) voneinander haben, der größer als 80%, vorzugsweise größer als 90% und insbesondere größer als 95% der Summe der Radien dieses Trockenzylinders (19) und dieser Leitwalze (20) ist. 2. Machine according to claim 1, characterized in that at least one removal scraper (24) is assigned to one, preferably the first drying cylinder (19) of the following drying group, with a pulper (23) being located under the removal scraper (24). and the axis of the drying cylinder (19) with the removal scraper (24) and the axis of the following, vacuumed guide roller (20) are vertically offset from one another and have a horizontal distance (22) from one another that is greater than 80%, preferably greater than 90% and in particular greater than 95% of the sum of the radii of this drying cylinder (19) and this guide roller (20).
3. Maschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Transferband (1 1 ) nach dem zweiten Pressspalt (3) und der Abgabe der Faserstoffbahn (1 ) von einer Reinigungsvorrichtung (13) gereinigt wird, die ein Reinigungsfluid mit einem Druck von mindestens 50, vorzugsweise mindestens 100 und insbesondere mindestens 120 bar auf die faserstoffbahnführende Seite richtet und mindestens einen, darauf folgenden Schaber (14) umfasst. 3. Machine according to one of the preceding claims, characterized in that the transfer belt (1 1) is cleaned after the second press nip (3) and the delivery of the fibrous web (1) by a cleaning device (13) which supplies a cleaning fluid at a pressure of at least 50, preferably at least 100 and in particular at least 120 bar on the side carrying the fibrous web and comprises at least one subsequent scraper (14).
4. Maschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sich das Transferband (1 1 ) im Bereich der4. Machine according to one of the preceding claims, characterized in that the transfer belt (1 1) is in the area of
Reinigungsvorrichtung (13) auf mindestens einer Leitwalze (15) abstützt. Cleaning device (13) is supported on at least one guide roller (15).
5. Maschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Strecke zwischen dem zweiten Pressspalt (3) und der Abgabe der Faserstoffbahn (1 ) an das übernehmende Band (12) kürzer als 2,5 m, vorzugsweise kürzer als 2 m und insbesondere kürzer als 1 ,5 m ist. 5. Machine according to one of the preceding claims, characterized in that the distance between the second press nip (3) and the delivery of the fibrous web (1) to the receiving belt (12) is shorter than 2.5 m, preferably shorter than 2 m and in particular shorter than 1.5 m.
6. Maschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass wenigstens ein, insbesondere beide Pressspalte (2,3) verlängert ausgebildet sind, wobei der verlängerte Pressspalt (2,3) vorzugsweise von einer zylindrischen Presswalze (5,7) und einer Schuh-Presswalze (4,6) gebildet wird, die einen flexiblen Walzenmantel besitzt, welcher von einem Anpressschuh mit konkaver Pressfläche zur zylindrischen Presswalze (5,7) gedrückt wird. 6. Machine according to one of the preceding claims, characterized in that at least one, in particular both press nips (2,3) are designed to be extended, the extended press nip (2,3) preferably being composed of a cylindrical press roller (5,7) and a shoe -Press roll (4,6) is formed, which has a flexible roll shell, which is pressed by a pressure shoe with a concave pressing surface to the cylindrical press roll (5,7).
7. Maschine nach Anspruch 6, dadurch gekennzeichnet, dass sich der verlängerte Presspalt (2,3) zumindest über 250 mm in Maschinenlaufrichtung (16) erstreckt und/oder eine Linienkraft von wenigstens 800 kN/m aufweist. 7. Machine according to claim 6, characterized in that the extended press nip (2,3) extends at least over 250 mm in the machine direction (16) and / or has a line force of at least 800 kN / m.
8. Maschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Transferband (1 1 ) auf der faserstoffbahnführenden Seite eine Rauigkeit Rz in Maschinenlaufrichtung (16) von weniger als 12, vorzugsweise weniger als 10 und insbesondere weniger als 8 μηη aufweist. 8. Machine according to one of the preceding claims, characterized in that the transfer belt (1 1) on the fibrous web Page has a roughness R z in the machine direction (16) of less than 12, preferably less than 10 and in particular less than 8 μηη.
9. Maschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Faserstoffbahn (1 ) zumindest vor dem ersten, vorzugsweise vor jedem Pressspalt (2,3) über eine möglichst lange Führungsstrecke von beiden Bändern (8,9,10,1 1 ) des jeweiligen Pressspaltes (2,3) geführt wird. 9. Machine according to one of the preceding claims, characterized in that the fibrous web (1) at least in front of the first, preferably in front of each press nip (2,3) over the longest possible guide path from both belts (8,9,10,1 1) of the respective press gap (2,3).
10. Maschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das obere Entwässerungsband (8) des ersten Pressspaltes (2) während einer Besaugung des unteren Entwässerungsbandes (9) von der Faserstoffbahn (1 ) weggeführt wird. 10. Machine according to one of the preceding claims, characterized in that the upper dewatering belt (8) of the first press nip (2) is guided away from the fibrous web (1) during suction of the lower dewatering belt (9).
1 1 . Maschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das andere Entwässerungsband (10) höchstens 200 mm nach dem zweiten Pressspalt (3) von der Faserstoffbahn (1 ) weggeführt wird. Maschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die mit der Maschine hergestellte Faserstoffbahn (1 ) ein Flächengewicht zwischen 50 und 180, vorzugsweise zwischen 50 und 120 g/m2 hat. 1 1 . Machine according to one of the preceding claims, characterized in that the other dewatering belt (10) is led away from the fibrous web (1) at most 200 mm after the second press nip (3). Machine according to one of the preceding claims, characterized in that the fibrous web (1) produced with the machine has a basis weight between 50 and 180, preferably between 50 and 120 g/m 2 .
EP17725974.4A 2016-06-03 2017-05-29 Machine for dewatering and drying a fibrous web Active EP3464716B1 (en)

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US11286617B2 (en) 2022-03-29
WO2017207475A1 (en) 2017-12-07
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EP3464716B1 (en) 2020-02-12
CN109563683A (en) 2019-04-02
US20190100876A1 (en) 2019-04-04

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