EP0854232B1 - Machine for the manufacture of a fibrous web - Google Patents

Machine for the manufacture of a fibrous web Download PDF

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Publication number
EP0854232B1
EP0854232B1 EP97119333A EP97119333A EP0854232B1 EP 0854232 B1 EP0854232 B1 EP 0854232B1 EP 97119333 A EP97119333 A EP 97119333A EP 97119333 A EP97119333 A EP 97119333A EP 0854232 B1 EP0854232 B1 EP 0854232B1
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Prior art keywords
press
nip
shoe
machine according
unit
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EP97119333A
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German (de)
French (fr)
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EP0854232A2 (en
EP0854232A3 (en
Inventor
Christian Schiel
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Voith Patent GmbH
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Voith Paper 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
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses
    • 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
    • D21F11/14—Making cellulose wadding, filter or blotting paper
    • 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
    • D21F3/0281—Wet presses in combination with a dryer roll

Definitions

  • the invention relates to a machine for producing a Tissue or tissue paper web with a pressure unit and a drying cylinder comprising Main press.
  • DE-A-42 24 730 different embodiments are one Hygiene paper machine of the type mentioned above.
  • One of these known embodiments includes a total of three press stations, namely two pre-presses between two upper rollers and two lower shoe press rollers with flexible Roller jacket and a main press with a pressure roller and a drying cylinder.
  • the paper web is on a Roller former between a drainage screen and an upper one Tape created.
  • Lower permeable felts Ribbons come together with the paper web and the top ribbon passed through the two pre-presses.
  • an upper one Tape the paper web from a former to it afterwards through a pre-press between a top roller and a Bottom roller with bottom felt through to a main press between a pressure roller and a drying cylinder.
  • the pressure roller a shoe press roll.
  • the top felt is very dense and the bottom felt is very water absorbent.
  • the lower roller is designed as a suction roller.
  • the blind holes or grooves in the surface of the press jacket may be limited due to their manufacturing constraints Do not absorb the entire amount of water. This should be a reason why most of the people in the Embodiments described in DE-A-42 24 730 two pre-presses and in one case additionally a suction pressure roller in the Main press are provided.
  • WO-A-9100389 is a machine for producing a fibrous web known with a shoe press unit, which is designed so that one in one Press gap of the shoe press unit over the gap length creates a progressive pressure profile Has pressure increase that begins in the area of the beginning of the gap and extends over at least a third of the gap length.
  • the aim of the invention is a machine of the type mentioned kind of creating the disadvantages mentioned above are eliminated and the generated, by the sum of all line forces divided by the web speed defined Press pulse as optimally as possible in a high paper quality, a high production output and low operating costs implemented and with the use of any suction press rolls becomes dispensable.
  • the special pressure distribution through a special Shape of the respective press shoe taking into account the radius of the counter roll, the press jacket and felt thickness as well as the dynamic compressibility of the used Press felts reached. Since the felt compressibility with the Operating time reduced, it is the selected one Shape of the press shoe around a compromise.
  • the Values previously given for the pressure profile should in particular for a new or for two new ones as upper and lower felt intended press felts at the beginning of their operating time in apply for the first two to four days of operation.
  • the respective shoe press unit is advantageous formed by a shoe press roll.
  • the machine according to the invention is behind in the direction of web travel the first shoe press provided a second shoe press, the length of the press nip of the first shoe press being greater or is equal to 100 mm and the length of the press nip second shoe press in a range from about 60 to about 130 mm lies.
  • the main press is the first viewed in the direction of web travel Press is in the direction of web travel in front of this first press preferably a preheating and / or predrying device provided to pre-dry or preheat the fibrous web, which significantly drains the fibrous web is improved.
  • the preheating and / or predrying device advantageously comprises at least one heat radiator and / or at least a steam box.
  • this preheating and / or predrying device also at least comprise a suction unit.
  • This suction unit in turn can, for example, by at least one suction box and / or at least one suction roll can be formed.
  • the Length of the press nip of the pre-press in a range of about 100 to about 250 mm and the length of the press nip of the main press in a range from about 50 to about 100 mm.
  • the pressure roller can Main press a conventional with blind holes Press roll with a soft rubber cover with a hardness of preferably about shore A 89 to 80 (25 to 45 P&J).
  • a soft rubber cover with a hardness of preferably about shore A 89 to 80 (25 to 45 P&J).
  • P&J Precision Engineering Laboratory
  • the Pussey & Jones device with 1/8 "ball measured plastomer points.
  • the line force is limited to around 90 kN / m. Higher line forces are the longest possible Soft rubber covers of the pressure rollers not available or not to recommend.
  • the pressure unit of the main press is a shoe press unit, preferably a shoe press roll.
  • Both presses can vary over a wide line force range Need to be set. For example, the line force one or both presses are withdrawn to the Softness of the product at the expense of production performance increase. Conversely, for maximum production of Mass products high line forces can be set. moreover can old, already heavily compacted felts to the next planned standstill of the machine can continue to be used if the line force is somewhat reduced.
  • the pressing unit of the main press is a shoe pressing unit, preferably a shoe press roll, is formed that generated in the nip of the main press maximum line force less than 250 kN / m and that in the range of the pressure rise gradient present at the beginning of the gap is lower than 50 kPa / mm.
  • the pressure rise gradient in the first shoe press for new felt in the field of The beginning of the gap is less than or equal to 30 kPa / mm.
  • the falling average gradient at the end of the press nip should preferably so steep that no significant rewetting the fibrous web through the separating from it Felt is done. According to a preferred embodiment in practice is accordingly provided that in the press nip the average gradient of the pressure drop of the respective shoe press at the end of the column in a range from about 400 to about 1000 kPa / mm.
  • At least the press nip of the main press zone is simply felted.
  • On Felt belt can both through the nip of a pre-press also be guided through the press nip of the main press.
  • the press nip at least one pre-press is double felted.
  • this Case is advantageously an upper felt band both through the press nip of the pre-press as well as through the press nip Main press and additionally a lower felt belt through the Press nip of the pre-press performed.
  • Figure 1 shows the pressure profile in a press nip Embodiment of a 1-felt tissue machine with new Felt.
  • the press nip in question is between a drying cylinder and a pressure roller.
  • the pressure shown in MPa is shown in the diagram p plotted over the length L of the press nip, the is given here in mm.
  • the line force generated in the press nip is about 170 kN / m.
  • a soft suction press felt with a basis weight of 1,350 g / m 2 was used as the felt.
  • the old felt still had about a third of the compressibility of the new felt.
  • the press jacket was 6.2 mm thick and provided with blind holes.
  • the maximum pressure p max is approximately 2.5 MPa.
  • Figure 2 shows the pressure profile in the press nip one Prepress of an embodiment of a 2-felt tissue machine with new felts.
  • the pressing pressure given in MPa is plotted over the length L of the press nip, which is given here in mm.
  • the line force F L generated in the press nip is approximately 175 kN / m in the embodiment shown with a solid curve. In a further embodiment shown in broken lines, this line force F L is approximately 120 kN / m.
  • the gap length is smaller in the second case than in the first case.
  • Figure 3 shows the pressure profile in a press nip Main press of the 2-felt tissue machine again through this Main press guided top felt.
  • the pressing pressure p given in MPa is plotted over the length L of the press nip, which is again given here in mm.
  • the line force F L generated in the press nip is approximately 170 kN / m.
  • the press nip of the main press is shorter than that Prepress nip.
  • the maximum pressure in the main press higher than that in the pre-press.

Description

Die Erfindung betrifft eine Maschine zur Herstellung einer Tissue- oder Hygienepapierbahn mit einer eine Anpreßeinheit und einen Trockenzylinder umfassenden Hauptpresse.The invention relates to a machine for producing a Tissue or tissue paper web with a pressure unit and a drying cylinder comprising Main press.

In der DE-A-42 24 730 sind verschiedene Ausführungsformen einer Hygienepapiermaschine der eingangs genannten Art beschrieben. Eine dieser bekannten Ausführungsformen umfaßt insgesamt drei Preßstellen, nämlich zwei Vorpressen zwischen zwei Oberwalzen und zwei unteren Schuhpreßwalzen mit flexiblem Walzenmantel sowie eine Hauptpresse mit einer Anpreßwalze und einem Trockenzylinder. Die Papierbahn wird auf einem Walzenformer zwischen einem Entwässerungssieb und einem oberen Band erzeugt. Als durchlässige Filze ausgebildete untere Bänder werden zusammen mit der Papierbahn und dem oberen Band durch die beiden Vorpressen hindurch geführt.In DE-A-42 24 730 different embodiments are one Hygiene paper machine of the type mentioned above. One of these known embodiments includes a total of three press stations, namely two pre-presses between two upper rollers and two lower shoe press rollers with flexible Roller jacket and a main press with a pressure roller and a drying cylinder. The paper web is on a Roller former between a drainage screen and an upper one Tape created. Lower permeable felts Ribbons come together with the paper web and the top ribbon passed through the two pre-presses.

Gemäß einer weiteren bekannten Ausführungsform nimmt ein oberes Band die Papierbahn von einem Former ab, um es anschließend durch eine Vorpresse zwischen einer Oberwalze und einer Unterwalze mit Unterfilz hindurch zu einer Hauptpresse zwischen einer Anpreßwalze und einem Trockenzylinder zu führen. Bei einer weiteren bekannten Ausführungsform ist die Anpreßwalze eine Schuhpreßwalze.According to a further known embodiment, an upper one Tape the paper web from a former to it afterwards through a pre-press between a top roller and a Bottom roller with bottom felt through to a main press between a pressure roller and a drying cylinder. In a further known embodiment, the pressure roller a shoe press roll.

Mit Ausnahme der Verwendung von Schuhpressen entsprechen diese bekannten Ausführungsformen etwa der früher üblichen, bei den neuen Hygienepapiermaschinen jedoch nicht mehr verwendeten Zweifilz-Tissue-Anordnung. With the exception of the use of shoe presses, these correspond known embodiments, for example, of the previously customary no longer used the new hygiene paper machines Two-felt tissue arrangement.

Bei diesen bekannten Zweifilz-Maschinen ist der Oberfilz sehr dicht und der Unterfilz sehr wasseraufnahmefähig. Zur Erreichung einer größtmöglichen Wasserabfuhr durch den Unterfilz ist die Unterwalze als Saugwalze ausgebildet.In these known two-felt machines, the top felt is very dense and the bottom felt is very water absorbent. To achieve the greatest possible water drainage through the bottom felt the lower roller is designed as a suction roller.

Das bei einer solchen Bauart von Zweifilz-Maschinen auftretende Problem, das zu einer Abkehr von diesem Prinzip und stattdessen zu der heutigen Verwendung von Einfilz-Maschinen führte, besteht darin, daß mit zunehmender Laufgeschwindigkeit auch mit einer Saugpresse nicht rasch genug vorentwässert werden kann und die Bahn infolge eines ungenügenden Wasserabflusses in der Vorpresse verdrückt wird.That which occurs with such a construction of two-felt machines Problem that leads to a departure from this principle and instead to today's use of single felt machines led, is that with increasing walking speed not pre-dewatered quickly enough even with a suction press can and the web due to insufficient water drainage is pressed in the pre-press.

Aus diesem Grund ist die Verwendung einer Schuhpresse als Vorpresse zwar grundsätzlich richtig. Bei den aus der DE-A-42 24 730 bekannten Ausführungsformen ist jedoch unter anderem von Nachteil, daß die jeweiligen Schuhpreßwalzen in unterer Position angeordnet sind, nachdem die Papierbahn sehr naß, d.h. mit einem Trockengehalt von etwa 6 bis 8 %, von dem Blattbildungssieb kommt.For this reason, the use of a shoe press as The pre-press is basically correct. In the from DE-A-42 24 730 known embodiments, however, is among others disadvantageous that the respective shoe press rolls in lower Position after the paper web is very wet, i.e. with a dryness of around 6 to 8%, of which Sheet forming screen is coming.

Die Blindbohrungen oder Rillen in der Oberfläche des Preßmantels können aufgrund ihrer fertigungsbedingten begrenzten Tiefe nicht die ganze anfallende Wassermenge aufnehmen. Dies dürfte ein Grund dafür sein, daß bei den meisten der in der DE-A-42 24 730 beschriebenen Ausführungsformen zwei Vorpressen und in einem Fall zusätzlich eine Sauganpreßwalze in der Hauptpresse vorgesehen sind.The blind holes or grooves in the surface of the press jacket may be limited due to their manufacturing constraints Do not absorb the entire amount of water. This should be a reason why most of the people in the Embodiments described in DE-A-42 24 730 two pre-presses and in one case additionally a suction pressure roller in the Main press are provided.

Bei den meisten der bekannten Ausführungsformen wird zudem ein wasserundurchlässiges oder wasserdichtes oberes Band verwendet. In most of the known embodiments also a waterproof or waterproof upper band is used.

Insbesondere im Vergleich zu einer Einfilz-Maschine nehmen die bekannten Ausführungsformen der Zweifilz-Maschine somit relativ viel Platz in Anspruch, zumal in den genannten Fällen zwei Vorpressen und eine Hauptpresse vorgesehen sind, die am Kreppzylinder kein Wasser entfernt.Especially when compared to a single felt machine the known embodiments of the two-felt machine relatively much space, especially in the cases mentioned two pre-presses and a main press are provided on Crepe cylinder no water removed.

Aus WO-A-9100389 ist eine Maschine zur Herstellung einer Faserstroffbahn mit einer Schuhpreßeinheit bekannt, die so ausgelegt ist, daß ein in einem Preßspalt der Schuhpreßeinheit über die Spaltlänge erzeugtes Druckprofil einen progressiven Druckanstieg aufweist, der im Bereich des Spaltanfanges beginnt und sich über wenigstens ein Drittel der Spaltlänge erstreckt.From WO-A-9100389 is a machine for producing a fibrous web known with a shoe press unit, which is designed so that one in one Press gap of the shoe press unit over the gap length creates a progressive pressure profile Has pressure increase that begins in the area of the beginning of the gap and extends over at least a third of the gap length.

Ziel der Erfindung ist es, eine Maschine der eingangs genannten Art zu schaffen, bei der die zuvor genannten Nachteile beseitigt sind und der erzeugte, durch die Summe aller Linienkräfte geteilt durch die Bahnlaufgeschwindigkeit definierte Preßimpuls möglichst optimal in eine hohe Papierqualität, eine hohe Produktionsleistung und geringe Betriebskosten umgesetzt ist und mit der die Verwendung irgendwelcher Saugpreßwalzen entbehrlich wird.The aim of the invention is a machine of the type mentioned Kind of creating the disadvantages mentioned above are eliminated and the generated, by the sum of all line forces divided by the web speed defined Press pulse as optimally as possible in a high paper quality, a high production output and low operating costs implemented and with the use of any suction press rolls becomes dispensable.

Die Aufgabe wird nach der Erfindung gemäß den Merkmalen des Anspruchs 1 gelöst.The object is achieved according to the invention solved according to the features of claim 1.

Hierbei wird die besondere Druckverteilung durch eine spezielle Formgebung des jeweiligen Preßschuhes unter Berücksichtigung des Radius der Gegenwalze, der Preßmantel- und Filzdicke sowie der dynamischen Kompressibilität der verwendeten Preßfilze erreicht. Da sich die Filzkompressibilität mit der Betriebszeit verringert, handelt es sich bei der jeweils gewählten Formgebung des Preßschuhes um einen Kompromiß. Die zuvor für das Druckprofil angegebenen Werte sollen insbesondere für einen neuen bzw. für zwei neue als Ober- und Unterfilz vorgesehene Preßfilze am Anfang ihrer Betriebszeit in den ersten zwei bis vier Einsatztagen gelten.Here, the special pressure distribution through a special Shape of the respective press shoe taking into account the radius of the counter roll, the press jacket and felt thickness as well as the dynamic compressibility of the used Press felts reached. Since the felt compressibility with the Operating time reduced, it is the selected one Shape of the press shoe around a compromise. The Values previously given for the pressure profile should in particular for a new or for two new ones as upper and lower felt intended press felts at the beginning of their operating time in apply for the first two to four days of operation.

Bei einer erfindungsgemäßen Ausführung des jeweiligen Preßschuhes ändert sich jedoch an der Grundtendenz des progressiven Druckanstieges selbst nach einer längeren Filzlaufdauer grundsätzlich praktisch nichts.In an embodiment of the respective press shoe according to the invention However, the basic trend of progressive changes Pressure increase even after a long felt run time basically practically nothing.

In der Praxis ist die jeweilige Schuhpreßeinheit vorteilhafterweise durch eine Schuhpreßwalze gebildet.In practice, the respective shoe press unit is advantageous formed by a shoe press roll.

Bei einer besonders vorteilhaften praktischen Ausführungsform der erfindungsgemäßen Maschine ist in Bahnlaufrichtung hinter der ersten Schuhpresse eine zweite Schuhpresse vorgesehen, wobei die Länge des Preßspaltes der ersten Schuhpresse größer oder gleich 100 mm ist und die Länge des Preßspaltes der zweiten Schuhpresse in einem Bereich von etwa 60 bis etwa 130 mm liegt.In a particularly advantageous practical embodiment the machine according to the invention is behind in the direction of web travel the first shoe press provided a second shoe press, the length of the press nip of the first shoe press being greater or is equal to 100 mm and the length of the press nip second shoe press in a range from about 60 to about 130 mm lies.

Ist die Hauptpresse die in Bahnlaufrichtung betrachtet erste Presse, so ist in Bahnlaufrichtung vor dieser ersten Presse vorzugsweise eine Vorwärm- und/oder Vortrockeneinrichtung vorgesehen, um die Faserstoffbahn vorzutrocknen bzw. vorzuwärmen, wodurch die Entwässerung der Faserstoffbahn deutlich verbessert wird.The main press is the first viewed in the direction of web travel Press is in the direction of web travel in front of this first press preferably a preheating and / or predrying device provided to pre-dry or preheat the fibrous web, which significantly drains the fibrous web is improved.

Die Vorwärm- und/oder Vortrockeneinrichtung umfaßt vorteilhafterweise wenigstens einen Wärmestrahler und/oder wenigstens einen Dampfblaskasten. Alternativ oder zusätzlich kann diese Vorwärm- und/oder Vortrockeneinrichtung auch wenigstens eine Absaugeinheit umfassen. Diese Absaugeinheit wiederum kann beispielsweise durch wenigstens einen Saugkasten und/oder wenigestens eine Saugwalze gebildet sein. The preheating and / or predrying device advantageously comprises at least one heat radiator and / or at least a steam box. Alternatively or additionally this preheating and / or predrying device also at least comprise a suction unit. This suction unit in turn can, for example, by at least one suction box and / or at least one suction roll can be formed.

Ist eine einer Vorpresse zugeordnete Preßeinheit durch eine Schuhpreßeinheit und die erste Schuhpresse durch diese Vorpresse gebildet, so liegt gemäß einer zweckmäßigen Ausführungsform die Länge des Preßspaltes der ebenfalls als Schuhpresse ausgebildeten Hauptpresse in einem Bereich von etwa einem Drittel bis etwa zwei Drittel der Länge des Preßspaltes der Vorpresse.Is a press unit assigned to a pre-press by a Shoe press unit and the first shoe press through this pre-press formed, so according to an expedient embodiment the length of the press nip also as Main press trained in a range of about a third to about two thirds of the length of the press nip the pre-press.

Bei einer in der Praxis bevorzugten Ausführungsform liegt die Länge des Preßspaltes der Vorpresse in einem Bereich von etwa 100 bis etwa 250 mm und die Länge des Preßspaltes der Hauptpresse in einem Bereich von etwa 50 bis etwa 100 mm.In a preferred embodiment in practice, the Length of the press nip of the pre-press in a range of about 100 to about 250 mm and the length of the press nip of the main press in a range from about 50 to about 100 mm.

Bei der Verwendung einer Vorpresse kann die Anpreßwalze der Hauptpresse eine mit Blindbohrungen versehene herkömmliche Preßwalze mit einem Weichgummibezug mit einer Härte von vorzugsweise etwa shore A 89 bis 80 (25 bis 45 P&J) sein. Bei den angegebenen Werten handelt es sich um mit dem Pussey & Jones-Gerät mit 1/8" Kugel gemessene Plastomerpunkte. Die angegebene Bauform besitzt den Vorteil, daß sie relativ preiswert ist. Die Linienkraft ist allerdings auf etwa 90 kN/m begrenzt. Höhere Linienkräfte sind hinsichtlich einer möglichst langen Haltbarkeit der Weichgummibezüge der Anpreßwalzen nicht erreichbar bzw. nicht zu empfehlen.When using a pre-press, the pressure roller can Main press a conventional with blind holes Press roll with a soft rubber cover with a hardness of preferably about shore A 89 to 80 (25 to 45 P&J). At the specified values is with the Pussey & Jones device with 1/8 "ball measured plastomer points. Has the specified design the advantage that it is relatively inexpensive. The line force is limited to around 90 kN / m. Higher line forces are the longest possible Soft rubber covers of the pressure rollers not available or not to recommend.

Die Anpreßeinheit der Hauptpresse ist durch eine Schuhpreßeinheit, vorzugsweise eine Schuhpreßwalze, gebildet. Dies bringt den großen Vorteil höherer Linienkräfte und einer unsymmetrischen Druckverteilung mit steilem Druckabfall am Ende des Preßspaltes mit sich. Im Ergebnis wird ein wesentlich höherer Endtrockengehalt erreicht. Beide Pressen können über einen weiten Linienkraftbereich hinweg je nach Bedarf eingestellt werden. So kann beispielsweise die Linienkraft einer oder beider Pressen zurückgenommen werden, um die Weichheit des Produktes auf Kosten der Produktionsleistung zu erhöhen. Umgekehrt können für eine maximale Produktion von Massenprodukten hohe Linienkräfte eingestellt werden. Zudem können alte, bereits stark verdichtete Filze bis zum nächsten geplanten Stillstand der Maschine weiter benutzt werden, wenn die Linienkraft etwas vermindert wird.The pressure unit of the main press is a shoe press unit, preferably a shoe press roll. This brings the great advantage of higher line forces and an asymmetrical pressure distribution with a steep pressure drop at the end of the press nip with it. As a result, one becomes essential higher final dryness reached. Both presses can vary over a wide line force range Need to be set. For example, the line force one or both presses are withdrawn to the Softness of the product at the expense of production performance increase. Conversely, for maximum production of Mass products high line forces can be set. moreover can old, already heavily compacted felts to the next planned standstill of the machine can continue to be used if the line force is somewhat reduced.

Ist die Anpreßeinheit der Hauptpresse durch eine Schuhpreßeinheit, vorzugsweise eine Schuhpreßwalze, gebildet, so ist die in dem Preßspalt der Hauptpresse erzeugte maximale Linienkraft geringer als 250 kN/m und der im Bereich des Spaltanfanges vorliegende Druckanstiegsgradient geringer als 50 kPa/mm.If the pressing unit of the main press is a shoe pressing unit, preferably a shoe press roll, is formed that generated in the nip of the main press maximum line force less than 250 kN / m and that in the range of the pressure rise gradient present at the beginning of the gap is lower than 50 kPa / mm.

Von besonderem Vorteil ist, wenn der Druckanstiegsgradient in der ersten Schuhpresse bei neuwertigen Filzen im Bereich des Spaltanfanges geringer oder gleich 30 kPa/mm ist.It is particularly advantageous if the pressure rise gradient in the first shoe press for new felt in the field of The beginning of the gap is less than or equal to 30 kPa / mm.

Der abfallende mittlere Gradient am Ende des Preßspaltes soll vorzugsweise so steil sein, daß keine wesentliche Wiederbefeuchtung der Faserstoffbahn durch den sich von ihr trennenden Filz erfolgt. Gemäß einer in der Praxis bevorzugten Ausführungsform ist demzufolge vorgesehen, daß in dem Preßspalt der jeweiligen Schuhpresse der mittlere Gradient des Druckabfalls am Spaltende in einem Bereich von etwa 400 bis etwa 1000 kPa/mm liegt.The falling average gradient at the end of the press nip should preferably so steep that no significant rewetting the fibrous web through the separating from it Felt is done. According to a preferred embodiment in practice is accordingly provided that in the press nip the average gradient of the pressure drop of the respective shoe press at the end of the column in a range from about 400 to about 1000 kPa / mm.

Insbesondere zur Herstellung weichen Papiers ist es von Vorteil, wenn die Linienkraft in der durch eine Vorpresse gebildeten ersten Presse höher ist als die in der durch die Hauptpresse gebildeten zweiten Presse und der maximale Druck in der zweiten Presse höher ist als der in der ersten Presse. It is particularly advantageous for the production of soft paper when the line force in the formed by a pre-press first press is higher than that in the main press formed second press and the maximum pressure in the second press is higher than that in the first press.

Bei der in der Praxis bevorzugten Ausführungsform ist zumindest der Preßspalt der Hauptpreßzone einfach befilzt. Ein Filzband kann sowohl durch den Preßspalt einer Vorpresse als auch durch den Preßspalt der Hauptpresse geführt sein.In the embodiment preferred in practice, at least the press nip of the main press zone is simply felted. On Felt belt can both through the nip of a pre-press also be guided through the press nip of the main press.

In bestimmten Fällen ist es zweckmäßig, wenn der Preßspalt wenigstens einer Vorpresse doppelt befilzt ist. In diesem Fall ist vorteilhafterweise ein oberes Filzband sowohl durch den Preßspalt der Vorpresse als auch durch den Preßspalt der Hauptpresse und zusätzlich ein unteres Filzband durch den Preßspalt der Vorpresse geführt.In certain cases it is useful if the press nip at least one pre-press is double felted. In this Case is advantageously an upper felt band both through the press nip of the pre-press as well as through the press nip Main press and additionally a lower felt belt through the Press nip of the pre-press performed.

In den Unteransprüchen sind weitere vorteilhafte Ausführungsvarianten der erfindungsgemäßen Maschine angegeben.Further advantageous design variants are in the subclaims specified the machine according to the invention.

Die Erfindung wird im folgenden anhand eines Ausführungsbeispiels unter Bezugnahme auf die Zeichnung näher erläutert; in dieser zeigen:

Figur 1
den Preßdruckverlauf einer 1-Filz-Tissue-Maschine bei neuem Filz,
Figur 2
den Preßdruckverlauf in der Vorpresse einer 2-Filz-Tissue-Maschine bei neuen Filzen und
Figur 3
den Preßdruckverlauf in der Hauptpresse der 2-Filz-Tissue-Maschine bei neuem Filzen.
The invention is explained below using an exemplary embodiment with reference to the drawing; in this show:
Figure 1
the pressure profile of a 1-felt tissue machine with new felt,
Figure 2
the pressure profile in the pre-press of a 2-felt tissue machine for new felts and
Figure 3
the pressure profile in the main press of the 2-felt tissue machine with new felting.

Figur 1 zeigt den Preßdruckverlauf in einem Preßspalt eines Ausführungsbeispiels einer 1-Filz-Tissue-Maschine bei neuem Filz. Der betreffende Preßspalt ist zwischen einem Trockenzylinder und einer Anpreßwalze gebildet. Figure 1 shows the pressure profile in a press nip Embodiment of a 1-felt tissue machine with new Felt. The press nip in question is between a drying cylinder and a pressure roller.

In dem dargestellten Diagramm ist der in MPa angegebene Preßdruck p über der Länge L des Preßspaltes aufgetragen, der hier in mm angegeben ist. Die in dem Preßspalt erzeugte Linienkraft beträgt etwa 170 kN/m.The pressure shown in MPa is shown in the diagram p plotted over the length L of the press nip, the is given here in mm. The line force generated in the press nip is about 170 kN / m.

Dem angegebenen beispielhaften Preßdruckverlauf lagen die folgenden Pressendaten zugrunde: Durchmesser des neuen, kalten Trockenzylinders = 3.658 mm Durchmesser des Trockenzylinders bei der
Produktion = 3.665 mm Durchmesser des alten Trockenzylinders bei der
Produktion = 3.635 mm The specified press pressure curve was based on the following press data: Diameter of the new, cold drying cylinder logo CNRS logo INIST 3,658 mm Diameter of the drying cylinder at the
Production = 3,665 mm Diameter of the old drying cylinder at the
Production = 3,635 mm

Als Filz wurde ein weicher Saugpreßfilz mit einem Flächengewicht von 1.350 g/m2 verwendet. Der alte Filz besaß noch etwa ein Drittel der Kompressibilität des neuen Filzes. Der Preßmantel war 6,2 mm dick und mit Blindbohrungen versehen.A soft suction press felt with a basis weight of 1,350 g / m 2 was used as the felt. The old felt still had about a third of the compressibility of the new felt. The press jacket was 6.2 mm thick and provided with blind holes.

Im vorliegenden Fall beträgt der maximale Druck pmax etwa 2,5 MPa.In the present case, the maximum pressure p max is approximately 2.5 MPa.

Figur 2 zeigt den Preßdruckverlauf in dem Preßspalt einer Vorpresse eines Ausführungsbeispiels einer 2-Filz-Tissue-Maschine bei neuen Filzen.Figure 2 shows the pressure profile in the press nip one Prepress of an embodiment of a 2-felt tissue machine with new felts.

In dem dargestellten Diagramm ist der in MPa angegebene Preßdruck über der Länge L des Preßspaltes aufgetragen, der hier in mm angegeben ist. Die in dem Preßspalt erzeugte Linienkraft FL beträgt bei dem mit einer durchgezogenen Kurve dargestellten Ausführungsbeispiel etwa 175 kN/m. Bei einem weiteren, gestrichelt dargestellten Ausführungsbeispiel beträgt diese Linienkraft FL etwa 120 kN/m. Wie der Figur 2 entnommen werden kann, ist im zweiten Fall die Spaltlänge geringer als im ersten Fall.In the diagram shown, the pressing pressure given in MPa is plotted over the length L of the press nip, which is given here in mm. The line force F L generated in the press nip is approximately 175 kN / m in the embodiment shown with a solid curve. In a further embodiment shown in broken lines, this line force F L is approximately 120 kN / m. As can be seen from FIG. 2, the gap length is smaller in the second case than in the first case.

Figur 3 zeigt den Preßdruckverlauf in einem Preßspalt der Hauptpresse der 2-Filz-Tissue-Maschine bei neuem durch diese Hauptpresse geführten Oberfilz.Figure 3 shows the pressure profile in a press nip Main press of the 2-felt tissue machine again through this Main press guided top felt.

In dem dargestellten Diagramm ist der in MPa angegebene Preßdruck p über der Länge L des Preßspaltes aufgetragen, der hier wieder in mm angegeben ist. Die in dem Preßspalt erzeugte Linienkraft FL beträgt etwa 170 kN/m.In the diagram shown, the pressing pressure p given in MPa is plotted over the length L of the press nip, which is again given here in mm. The line force F L generated in the press nip is approximately 170 kN / m.

Wie sich aus einem Vergleich der Diagramme der Figuren 2 und 3 ergibt, ist der Preßspalt der Hauptpresse kürzer als der Preßspalt der Vorpresse. Zudem ist im vorliegenden Fall der maximale Druck in der Hauptpresse höher als der in der Vorpresse.As can be seen from a comparison of the diagrams in FIGS 3 results, the press nip of the main press is shorter than that Prepress nip. In addition, in the present case the maximum pressure in the main press higher than that in the pre-press.

Zudem kann den Diagrammen der Figuren 1 bis 3 entnommen werden, daß das in dem jeweiligen Preßspalt über die Spaltlänge erzeugte Druckprofil einen progressiven Druckanstieg aufweist, der im Bereich des Spaltanfanges beginnt und sich über wenigstens ein Drittel, vorzugsweise wenigstens die Hälfte der Spaltlänge erstreckt. In addition, the diagrams of Figures 1 to 3 can be seen that in the respective press gap over the gap length generated pressure profile has a progressive pressure increase, that begins in the area of the gap beginning and over at least a third, preferably at least half the gap length extends.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

FL F L
Linienkraftline force
LL
Preßspaltlängenip length
p(L)p (L)
Druckprofil über die PreßspaltlängePressure profile over the press nip length
pmax p max
maximaler Druckmaximum pressure

Claims (19)

  1. Machine for producing a tissue or hygienic paper web, having at least one shoe press unit, a main press comprising a pressing unit and a drying cylinder being provided, and at least the pressing unit of the main press being formed by a shoe press unit to form a shoe press with a press nip that is extended in the web running direction, and the first shoe press, as viewed in the web running direction, being designed in such a way that a pressure profile p(L) produced over the nip length (L) in its press nip by a specific shaping of the respective press shoe, taking into account the radius of an opposing roll, a press cover thickness and felt thickness and a dynamic compressibility of the press felt used, exhibits a progressive pressure rise, which begins in the area of the nip start and extends at least over a third, preferably at least half, of the nip length (L), a maximum line force (FL) produced in the press nip of the main press being less than 250 kN/m, and a pressure-rise gradient present in the area of the nip start being lower than 50 kPa/mm.
  2. Machine according to Claim 1, characterized in that the shoe press unit is a shoe press roll.
  3. Machine according to Claim 1 or 2, characterized in that, as viewed in the web running direction, a second shoe press is provided downstream of the first shoe press, in that the length (L) of the press nip of the first shoe press is greater than or equal to 100 mm, and in that the length (L) of the press nip of the second shoe press lies in a range from about 60 to about 130 mm.
  4. Machine according to one of the preceding claims, characterized in that the main press is the first press, as viewed in the web running direction, and in that upstream of this first press in the web running direction there is provided a preheating and/or predrying device, in order to predry or preheat the fibrous web.
  5. Machine according to Claim 4, characterized in that the preheating and/or predrying device comprises at least one radiant heater and/or at least one steam blower box.
  6. Machine according to Claim 4 or 5, characterized in that the preheating and/or predrying device comprises at least one suction unit.
  7. Machine according to Claim 6, characterized in that the suction unit comprises at least one suction box and/or at least one suction roll.
  8. Machine according to one of the preceding claims, characterized in that a press unit associated with a prepress is formed by a shoe press unit, and the first shoe press is formed by this prepress, in that the press unit of the main press is also formed by a shoe press unit, and in that the length (L) of the press nip of the main press lies in a range of about one third to about two thirds of the length (L) of the press nip of the prepress.
  9. Machine according to Claim 8, characterized in that the press unit associated with the prepress is formed by a shoe press unit, and the first shoe press is formed by this prepress, in that the press unit of the main press is also formed by a shoe press unit, and in that the length (L) of the press nip of the prepress lies in a range from about 100 to about 250 mm, and the length (L) of the press nip of the main press lies in a range from about 50 to about 100 mm.
  10. Machine according to one of the preceding claims, characterized in that the pressure-rise gradient in the first shoe press in the case of as-new felts is lower than or equal to 30 kPa/mm in the area of the nip start.
  11. Machine according to one of the preceding claims, characterized in that the press unit of the main press is formed by a shoe press unit, preferably a shoe press roll, and in that in its press nip the average gradient of the pressure drop at the end of the nip lies in a range from about 500 to 1000 kPa/mm.
  12. Machine according to one of Claims 8 to 11, characterized in that the press unit of the prepress is formed by a shoe press unit, preferably a shoe press roll, and in that in its press nip the average gradient of the pressure drop at the end of the nip lies in a range from about 500 to 1000 kPa/mm.
  13. Machine according to one of Claims 8 to 12, characterized in that the line force (FL) in the first press formed by the prepress is higher than that in the second press formed by the main press, and in that the maximum pressure (Pmax) in the second press is higher than that in the first press.
  14. Machine according to one of the preceding claims, characterized in that at least the press nip of the main press zone is single-felted.
  15. Machine according to one of Claims 8 to 14, characterized in that a felt belt is led through the press nip of the prepress and also through the press nip of the main press.
  16. Machine according to one of Claims 8 to 15, characterized in that the press nip of at least the prepress is double-felted.
  17. Machine according to Claim 16, characterized in that an upper felt belt is led both through the press nip of the prepress and through the press nip of the main press and, in addition, a lower felt belt is led through the press nip of the prepress.
  18. Machine according to one of Claims 1 to 17, characterized in that the press cover of the pressure roll has depressions in its pressing surface to accommodate water that is pressed out.
  19. Machine according to one of Claims 8 to 18, characterized in that the cover of the shoe press roll of the prepress has no depressions to accommodate water on its outer surface.
EP97119333A 1996-12-23 1997-11-05 Machine for the manufacture of a fibrous web Expired - Lifetime EP0854232B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19654197A DE19654197A1 (en) 1996-12-23 1996-12-23 Machine for the production of a fibrous web
DE19654197 1996-12-23

Publications (3)

Publication Number Publication Date
EP0854232A2 EP0854232A2 (en) 1998-07-22
EP0854232A3 EP0854232A3 (en) 1999-07-28
EP0854232B1 true EP0854232B1 (en) 2003-04-09

Family

ID=7816125

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EP97119333A Expired - Lifetime EP0854232B1 (en) 1996-12-23 1997-11-05 Machine for the manufacture of a fibrous web

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Country Link
US (1) US6083349A (en)
EP (1) EP0854232B1 (en)
DE (2) DE19654197A1 (en)

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ATE352666T1 (en) * 2000-05-18 2007-02-15 Metso Paper Karlstad Ab SOFT CREPE PAPER MACHINE AND PRESS SECTION THEREOF
DE10032251A1 (en) * 2000-07-03 2002-01-17 Voith Paper Patent Gmbh Water extraction station for a web of tissue/toilet paper has a shoe press unit at the drying cylinder with an extended press gap and a suction unit within an overpressure hood at the carrier belt
EP1251203B1 (en) * 2001-04-18 2007-06-13 Stowe Woodward Aktiengesellschaft Shoe press belt
EP1293601A1 (en) * 2001-09-17 2003-03-19 Stowe Woodward Aktiengesellschaft Belt for shoe press
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US6669821B2 (en) 1998-11-13 2003-12-30 Fort James Corporation Apparatus for maximizing water removal in a press nip
US7754049B2 (en) 1998-11-13 2010-07-13 Georgia-Pacific Consumer Products Lp Method for maximizing water removal in a press nip

Also Published As

Publication number Publication date
EP0854232A2 (en) 1998-07-22
DE59709775D1 (en) 2003-05-15
DE19654197A1 (en) 1998-06-25
US6083349A (en) 2000-07-04
EP0854232A3 (en) 1999-07-28

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