EP0652992B2 - Press of paper machine for thin papers - Google Patents

Press of paper machine for thin papers Download PDF

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Publication number
EP0652992B2
EP0652992B2 EP94917672A EP94917672A EP0652992B2 EP 0652992 B2 EP0652992 B2 EP 0652992B2 EP 94917672 A EP94917672 A EP 94917672A EP 94917672 A EP94917672 A EP 94917672A EP 0652992 B2 EP0652992 B2 EP 0652992B2
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EP
European Patent Office
Prior art keywords
press
roll
nip
section according
smooth
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP94917672A
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German (de)
French (fr)
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EP0652992B1 (en
EP0652992A1 (en
Inventor
Karl Steiner
Albrecht Meinecke
Rui Goncalves
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JM Voith GmbH
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JM Voith GmbH
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Priority claimed from DE4318036A external-priority patent/DE4318036C1/en
Priority claimed from DE19934321402 external-priority patent/DE4321402A1/en
Application filed by JM Voith GmbH filed Critical JM Voith GmbH
Publication of EP0652992A1 publication Critical patent/EP0652992A1/en
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    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00Press section of machines for making continuous webs of paper
    • D21F3/02Wet presses
    • D21F3/04Arrangements thereof
    • D21F3/045Arrangements thereof including at least one extended press nip
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00Press section of machines for making continuous webs of paper
    • D21F3/02Wet presses
    • D21F3/0281Wet presses in combination with a dryer roll
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00Press section of machines for making continuous webs of paper
    • D21F3/02Wet presses
    • D21F3/04Arrangements thereof

Definitions

  • the invention relates to a press section of a paper machine for thin Papers according to the preamble of claim 1, in particular for single-sided papers or tissue, in particular those Web acceptance at the last press unit.
  • a press nip which consists of a circumferential, smooth surface in contact with the paper and is formed from a felted press roll, the smooth surface transfers the, avoiding a free paper pull Paper web behind the press nip to a heatable roller, the smooth one Surface as the outer surface of a tubular roller with a rigid roller jacket is trained.
  • the felted press roll has an extended nip or Shoe press roller is.
  • the suction zone is mainly in front of the pre-press nip.
  • the smooth tube roller may also be advantageous to design the smooth tube roller as a deflection adjusting roller in order to maintain uniform line pressures and thus improve web transfer.
  • a further advantageous embodiment of the press section results if the heatable roller is a non-felted tube roller guiding the web, which delivers the web to a drying cylinder, preferably avoiding the free paper draw.
  • the gap between the smooth tube roller and the heatable roller in particular a drying cylinder, can be opened to to facilitate starting without paper.
  • Figure 1 shows the last press unit of a paper machine with a smooth Central roller 1 (a tube roller - i.e. with a rigid outer jacket), with another roller 2 a penultimate press nip together with a passes through single felt.
  • the roller 2 can be a suction roller or be a blind drilled roller.
  • the paper web then remains on the lie smooth roller 1 and is guided to a last press nip which by the roller 1 and an extended-nip press 3 are formed. After that the remains Paper web continues to lie on the smooth roller 1 and becomes a large one Smoothing cylinder 4, which can also be designed as a tissue cylinder, transferred according to the invention.
  • Figure 2 shows an arrangement similar to Figure 1, but is the last Press nip between the central roller 1, which is also a tube roller is formed, and the counter roll 3 not as an extended nip press but as so-called smoothing press executed.
  • the paper web also remains as in Figure 2 after the last nip on the smooth central roller 1 and is then transferred to a heated cylinder 4, for example.
  • a heated cylinder 4 for example.
  • FIG. 3 shows a special embodiment of the transfer according to the invention.
  • the beginning of a paper machine is shown here, in which stock suspension is injected between a screen 6 and a felt 10, which abut a blow roller 20, via a headbox 11.
  • the paper web is transported lying on this felt up to the press nip, which is formed here by an extended nip press 3 and the smooth tube roll 1 according to the invention. Possible devices between the press nip and the headbox are not shown here.
  • the paper web is transferred directly to a subsequent cylinder 5 via the smooth roller 1.
  • the roller 1 can preferably be designed as a deflection adjusting roller in order to ensure a pressure which is as uniform as possible, in particular on the following cylinder 5.
  • Figure 4 shows a situation at the last press nip of a press section.
  • a press unit between two cylinders 1 and 3 is shown here, the cylinder 1 representing the smooth cylinder according to the invention with a dimensionally stable surface.
  • the two cylinders 1 and 3 are provided here according to the invention on a movable lever arm 40, so that they can be moved in and out in their entirety by the subsequent large cylinder 30 without the press nip between the two cylinders 1 and 3 changing.
  • Figure 5 shows a further variant of the invention. It's coming from the left a felt 10 carrying a paper web 100 is shown.
  • the felt 10 leads the Paper web from above over a cylinder 300, the one with the following smooth tube roll 1 according to the invention forms a penultimate press nip. While after the penultimate press nip the paper web goes directly to the last one Press nip between the smooth tube roll 1 and the subsequent roll 600 is guided, the felt runs over a conditioning device 8 and Deflection roller 400 separated from the paper web back to the last one Press nip over the roller 600 and is returned from there during the Paper web remains on the smooth roller 1 and directly to the subsequent drying cylinder 7 is passed.
  • Figure 6 shows a press unit according to the invention of a compact design. It is here 11 stock suspension between a felt and a headbox introduced a smooth tube roller 1. One lies on the smooth tube roller 1 Long nip press 3 and then again on the smooth roller next smooth roller 1 ', the paper web to the subsequent station of the Convicted paper machine.
  • FIG. 7 shows the arrangement according to the invention using the example of a Paper machine for the production of crepe paper. It's from the right coming tape 500 to see on which the paper web is guided. The The tape is passed together with the paper web over a suction roll 200, which passes the paper web to a profile roller 1 with a rigid jacket. While the belt 500 is being fed back via a deflection roller, the paper web remains on the profile roller 1 and becomes a press nip, formed by the profile roller 1 and an extended nip press 3, supplied by where it remains on the surface of the profile roller and then on a crepe cylinder 4 is transferred, which rests on the profile roller 1.

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  • Paper (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Color Printing (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Press Drives And Press Lines (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)

Abstract

PCT No. PCT/EP94/01730 Sec. 371 Date Jan. 30, 1995 Sec. 102(e) Date Jan. 30, 1995 PCT Filed May 27, 1994 PCT Pub. No. WO94/28240 PCT Pub. Date Dec. 8, 1994The press section of a paper machine for thin papers has the following characteristics: a pressing gap is formed by a rotary, smooth surface (1) in contact with the paper and by a felted pressing roll (3); the smooth surface (1) transfers the paper web downstream of the pressing gap to a heatable roll (4) without free pulling of the paper web. The invention is characterized in that the smooth surface (1) is the outer surface of a tubular roll with dimensionally stiff roll sleeve.

Description

Die Erfindung betrifft eine Pressenpartie einer Papiermaschine für dünne Papiere gemäß dem Oberbegriff des Anspruches 1 insbesondere für einseitige Papiere oder Tissue, insbesondere die Bahnabnahme an der letzten Presseneinheit.The invention relates to a press section of a paper machine for thin Papers according to the preamble of claim 1, in particular for single-sided papers or tissue, in particular those Web acceptance at the last press unit.

Presseneinheiten in Papiermaschinen, bei denen das Wasser einseitig abgeführt wird sind hinlänglich bekannt. Beispielsweise wird auf die Schrift "Wochenblatt für Papierfabrikation 5 (1988)", Seite 173 ff, verwiesen. Es wird dort nach dem Preßspalt die Bahn im freien Zug von der glatten Walze abgenommen um z.B. einer Glättpresse, einem Trockenzylinder oder einer Reihen-Trockenpartie zugeführt zu werden.Press units in paper machines where the water is one-sided dissipated are well known. For example, the font "Wochenblatt für Papierfabrikation 5 (1988)", page 173 ff. It will there after the press nip the web in free train from the smooth roller decreased by e.g. a smoothing press, a drying cylinder or one Row dryer section to be fed.

Nachteil dieser Ausführungsformen ist, daß spezielle Überführelemente für die Bahn notwendig sind und die Abrißhäufigkeit relativ hoch ist.The disadvantage of these embodiments is that special transfer elements for the Web are necessary and the frequency of demolition is relatively high.

Weiterhin wird auf die nach dem Prioritätstag der vorliegenden Anmeldung und damit nicht zum Stand der Technik gehörende deutsche Patentanmeldung DE 42 24 730 C1 verwiesen, in der in Figur 8 eine Abnahme der Papierbahn von einer Walze durch einen Preßschlauch einer Langspaltpresse 13.3 dargestellt ist. Hier ist nachteilig, daß die Standzeit des Preßschlauches durch den Kontakt mit der heißen Oberfläche des folgenden Zylinders 20 stark reduziert wird.Furthermore, after the priority date of the present application and thus not German state of the art Patent application DE 42 24 730 C1 referred to in the figure 8 a decrease the paper web from a roller through a press hose Long nip press 13.3 is shown. The disadvantage here is that the service life of the Press hose through contact with the hot surface of the following Cylinder 20 is greatly reduced.

Es ist Aufgabe der Erfindung eine Presseneinheit darzustellen bei der auf derartige Überführelemente verzichtet werden kann, wodurch die Abrißhäufigkeit der Papierbahn reduziert wird und gleichzeitig Kosteneinsparungen durch verringerte Betriebskosten erbringt. It is an object of the invention to present a press unit in the such transfer elements can be dispensed with, whereby the Tear frequency of the paper web is reduced and at the same time Cost savings through reduced operating costs.

Die Aufgabe wird durch die kennzeichnenden Merkmale des Anspruches 1 gelöst.The object is achieved by the characterizing features of claim 1 solved.

Hierbei ergeben sich die folgenden Vorteile:

  • Die heizbare Walze (z.B ein Trocken oder Glättzylinder), an die die Papierbahn von der Rohr-Preßwalze überführt wird, kommt weder mit einem Filz, noch mit einem "Preßschlauch" oder "Preßmantel" in Kontakt.
  • Der Filz muß nur einen einzigen Preßspalt durchlaufen.
  • Daraus ergibt sich eine höhere Lebensdauer sowohl für den Preßmantel als auch den Filz.
This has the following advantages:
  • The heatable roll (for example a drying or smoothing cylinder) to which the paper web is transferred from the tube press roll does not come into contact with either a felt or a "press hose" or "press jacket".
  • The felt only has to pass through a single press nip.
  • This results in a longer service life for both the press jacket and the felt.

Gemäß dem Gedanken der Erfindung ergeben sich die folgenden, möglichen Ausgestaltungsformen einer Pressenpartie für vorzugsweise dünne Papiere, insbesondere auch Tissuepapiere:According to the idea of the invention, the following are possible Embodiments of a press section for preferably thin papers, especially tissue paper:

Es ist zunächst ein Preßspalt vorgesehen, der aus einer umlaufenden, glatten papierberührten Oberfläche und aus einer befilzten Preßwalze gebildet wird, die glatte Oberfläche übergibt unter Vermeidung eines freien Papierzuges die Papierbahn hinter dem Preßspalt an eine heizbare Walze, wobei die glatte Oberfläche als Mantelfläche einer Rohrwalze mit formsteifem Walzenmantel ausgebildet ist.First, a press nip is provided, which consists of a circumferential, smooth surface in contact with the paper and is formed from a felted press roll, the smooth surface transfers the, avoiding a free paper pull Paper web behind the press nip to a heatable roller, the smooth one Surface as the outer surface of a tubular roller with a rigid roller jacket is trained.

Vorteilhaft ist es, wenn die befilzte Preßwalze eine Langspalt- oder Schuhpreßwalze ist.It is advantageous if the felted press roll has an extended nip or Shoe press roller is.

Weiterhin ist es besonders vorteilhaft, wenn bei einer derart ausgestalteten Pressenpartie die glatte Rohrwalze vor dem Preßspalt mit einer weiteren befilzten Preßwalze einen weiteren, vorangehenden Preßspalt (Vor-Preßspalt) bildet. Hier ist es auch vorteilhaft wenn für beide Preßspalte jeweils ein separater, endloser Filz vorgesehen ist; jedoch kann auch ein einziger Filz für beide Preßspalte aufgrund der Betriebsumstände vorteilhaft sein. Besonders vorteilhaft bezüglich der Trockenleistung kann es sein, wenn auch die weitere befilzte Preßwalze eine Schuh- oder Langspaltpreßwalze ist.Furthermore, it is particularly advantageous if, in the case of such a design Press section the smooth tube roll in front of the press nip with another felted press roll a further, preceding press nip (pre-press nip) forms. Here it is also advantageous if one for each press nip separate, endless felt is provided; however, a single felt can also be advantageous for both press nips due to the operating circumstances. Especially It can be advantageous with regard to the drying performance, even if the further one felted press roll is a shoe or extended-nip press roll.

Vorteilhaft kann auch sein, wenn die weitere befilzte Preßwalze eine Saugwalze ist, deren Saugzone überwiegend vor dem Vor-Preßspalt liegt.It can also be advantageous if the further felted press roll is a Is suction roll, the suction zone is mainly in front of the pre-press nip.

Bei den dargestellten Ausführungsformen kann es auch vorteilhaft sein, die glatte Rohrwalze als Durchbiegungs-Einstellwalze auszugestalten, um gleichmäßige Liniendrücke zu erhalten und damit die Bahnübergabe zu verbessern.
Eine weitere vorteilhafte Ausgestaltung der Pressenpartie ergibt sich, wenn die heizbare Walze eine nicht befilzte, die Bahn führende Rohrwalze ist, welche die Bahn an einen Trockenzylinder abgibt, wobei vorzugsweise der freie Papierzug vermieden wird.
In the illustrated embodiments, it may also be advantageous to design the smooth tube roller as a deflection adjusting roller in order to maintain uniform line pressures and thus improve web transfer.
A further advantageous embodiment of the press section results if the heatable roller is a non-felted tube roller guiding the web, which delivers the web to a drying cylinder, preferably avoiding the free paper draw.

Bei den dargestellten Ausführungen kann es sich ebenfalls als vorteilhaft erweisen, wenn der Spalt zwischen der glatten Rohrwalze und der beheizbaren Walze, insbesondere eines Trockenzylinders, öffenbar ist, um das Anfahren ohne Papier zu erleichtern.In the embodiments shown, it can also be advantageous prove if the gap between the smooth tube roller and the heatable roller, in particular a drying cylinder, can be opened to to facilitate starting without paper.

Die Erfindung ist anhand der Zeichnungen näher erläutert. Darin ist im übrigen folgendes dargestellt:

  • Figuren 1 bis 7 zeigen Ausführungsvarianten einer Bahnübergabe zwischen der Presseneinheit und der nachfolgenden Papiermaschine mit glatten Walzen.
  • The invention is explained in more detail with reference to the drawings. It also shows the following:
  • Figures 1 to 7 show design variants of a web transfer between the press unit and the subsequent paper machine with smooth rollers.
  • Figur 1 zeigt die letzte Presseneinheit einer Papiermaschine mit einer glatten Zentralwalze 1 (einer Rohrwalze - also mit formsteifem Außenmantel), die mit einer anderen Walze 2 einen vorletzten Preßspalt zusammen mit einem hindurchlaufenden Einfachfilz bildet. Die Walze 2 kann dabei eine Saugwalze oder eine blind-gebohrte Walze sein. Die Papierbahn bleibt danach auf der glatten Walze 1 liegen und wird zu einem letzten Preßspalt geführt, der durch die Walze 1 und eine Langspalt-Presse 3 gebildet wird. Danach bleibt die Papierbahn weiterhin an der glatten Walze 1 liegen und wird zu einem großen Glättzylinder 4 der auch als Tissue-Zylinder ausgebildet sein kann, erfindungsgemäß überführt.Figure 1 shows the last press unit of a paper machine with a smooth Central roller 1 (a tube roller - i.e. with a rigid outer jacket), with another roller 2 a penultimate press nip together with a passes through single felt. The roller 2 can be a suction roller or be a blind drilled roller. The paper web then remains on the lie smooth roller 1 and is guided to a last press nip which by the roller 1 and an extended-nip press 3 are formed. After that the remains Paper web continues to lie on the smooth roller 1 and becomes a large one Smoothing cylinder 4, which can also be designed as a tissue cylinder, transferred according to the invention.

    Figur 2 zeigt eine ähnliche Anordnung wie Figur 1, jedoch ist der letzte Preßspalt zwischen der Zentralwalze 1, die ebenfalls als Rohrwalze ausgebildet ist, und der Gegenwalze 3 nicht als Langspalt-Presse sondern als sogenannte Smoothing-Presse ausgeführt. Die Papierbahn bleibt ebenfalls wie in Figur 2 nach dem letzten Preßspalt auf der glatten Zentralwalze 1 liegen und wird danach zu einem beispielsweise beheizten Zylinder 4 überführt. Alternativ besteht hier auch die Möglichkeit die Papierbahn vom Zylinder 4 direkt an einen darauf folgenden Glättzylinder weiterzugeben.Figure 2 shows an arrangement similar to Figure 1, but is the last Press nip between the central roller 1, which is also a tube roller is formed, and the counter roll 3 not as an extended nip press but as so-called smoothing press executed. The paper web also remains as in Figure 2 after the last nip on the smooth central roller 1 and is then transferred to a heated cylinder 4, for example. Alternatively, there is also the possibility of the paper web from cylinder 4 passed on directly to a subsequent smoothing cylinder.

    Figur 3 zeigt eine besondere Ausführungsform der erfindungsgemäßen Überführung. Es ist hier der Beginn einer Papiermaschine dargestellt, in der über einen Stoffauflauf 11 Stoffsuspension zwischen einem Sieb 6 und einem Filz 10, die an einer Blaswalze 20 anliegen, eingespritzt wird. Die Papierbahn wird auf diesem Filz liegend bis zum Preßspalt, der hier durch eine Langspalt-Presse 3 und der erfindungsgemäßen glatten Rohrwalze 1 gebildet wird, weiter transportiert. Mögliche Vorrichtungen zwischen dem Preßspalt und dem Stoffauflauf sind hier nicht dargestellt. Nach dem letzten Preßspalt wird die Papierbahn erfindungsgemäß über die glatte Walze 1 direkt an einen darauf folgenden Zylinder 5 übergeben. Die Walze 1 kann vorzugsweise als Durchbiegungs-Einstellwalze ausgeführt sein, um einen möglichst gleichmäßigen Andruck, insbesondere an den folgenden Zylinder 5, zu gewährleisten.
    Figur 4 zeigt eine Situation am letzten Preßspalt einer Pressenpartie. Es ist hier eine Presseneinheit zwischen zwei Zylindern 1 und 3 dargestellt, wobei der Zylinder 1 den erfindungsgemäßen glatten Zylinder mit formsteifer Oberfläche darstellt. Die beiden Zylinder 1 und 3 sind erfindungsgemäß hier an einem beweglichen Hebelarm 40 vorgesehen, so daß sie in ihrer Gesamtheit von dem darauf folgenden großen Zylinder 30 an- und abgefahren werden können ohne daß sich der Preßspalt zwischen den beiden Zylindern 1 und 3 ändert.
    FIG. 3 shows a special embodiment of the transfer according to the invention. The beginning of a paper machine is shown here, in which stock suspension is injected between a screen 6 and a felt 10, which abut a blow roller 20, via a headbox 11. The paper web is transported lying on this felt up to the press nip, which is formed here by an extended nip press 3 and the smooth tube roll 1 according to the invention. Possible devices between the press nip and the headbox are not shown here. After the last press nip, the paper web is transferred directly to a subsequent cylinder 5 via the smooth roller 1. The roller 1 can preferably be designed as a deflection adjusting roller in order to ensure a pressure which is as uniform as possible, in particular on the following cylinder 5.
    Figure 4 shows a situation at the last press nip of a press section. A press unit between two cylinders 1 and 3 is shown here, the cylinder 1 representing the smooth cylinder according to the invention with a dimensionally stable surface. The two cylinders 1 and 3 are provided here according to the invention on a movable lever arm 40, so that they can be moved in and out in their entirety by the subsequent large cylinder 30 without the press nip between the two cylinders 1 and 3 changing.

    Figur 5 zeigt eine weitere Variante der Erfindung. Es ist von links kommend ein eine Papierbahn 100 tragender Filz 10 dargestellt. Der Filz 10 führt die Papierbahn von oben über einen Zylinder 300, der mit der darauffolgenden erfindungsgemäßen glatten Rohrwalze 1 einen vorletzten Preßspalt bildet. Während nach dem vorletzten Preßspalt die Papierbahn direkt zum letzten Preßspalt zwischen der glatten Rohrwalze 1 und der nachfolgenden Walze 600 geführt wird, verläuft der Filz über eine Konditioniervorrichtung 8 und eine Umlenkwalze 400 getrennt von der Papierbahn wieder zurück zum letzten Preßspalt über die Walze 600 und wird von dort zurückgeführt, während die Papierbahn an der glatten Walze 1 liegenbleibt und direkt an den nachfolgenden Trockenzylinder 7 übergeben wird.Figure 5 shows a further variant of the invention. It's coming from the left a felt 10 carrying a paper web 100 is shown. The felt 10 leads the Paper web from above over a cylinder 300, the one with the following smooth tube roll 1 according to the invention forms a penultimate press nip. While after the penultimate press nip the paper web goes directly to the last one Press nip between the smooth tube roll 1 and the subsequent roll 600 is guided, the felt runs over a conditioning device 8 and Deflection roller 400 separated from the paper web back to the last one Press nip over the roller 600 and is returned from there during the Paper web remains on the smooth roller 1 and directly to the subsequent drying cylinder 7 is passed.

    Figur 6 zeigt eine erfindungsgemäße Presseneinheit kompakter Bauweise. Es wird hier über einen Stoffauflauf 11 Stoffsuspension zwischen ein Filz und eine glatte Rohrwalze 1 eingeführt. An der glatten Rohrwalze 1 liegt eine Langspalt-Presse 3 an und daran folgend wiederum an der glatten Walze eine nächste glatte Walze 1', die die Papierbahn zur nachfolgenden Station der Papiermaschine überführt. Figure 6 shows a press unit according to the invention of a compact design. It is here 11 stock suspension between a felt and a headbox introduced a smooth tube roller 1. One lies on the smooth tube roller 1 Long nip press 3 and then again on the smooth roller next smooth roller 1 ', the paper web to the subsequent station of the Convicted paper machine.

    Figur 7 zeigt die erfindungsgemäße Anordnung am Beispiel einer Papiermaschine zum Erzeugen von Krepp-Papier. Es ist ein von rechts kommendes Band 500 zu sehen, auf dem die Papierbahn geführt wird. Das Band wird zusammen mit der Papierbahn über eine Saugwalze 200 geleitet, die die Papierbahn an eine Profilwalze 1 mit formsteifem Mantel übergibt. Während das Band 500 wieder über eine Umlenkrolle zurückgeführt wird, verbleibt die Papierbahn auf der Profilwalze 1 und wird einem Preßspalt, gebildet durch die Profilwalze 1 und eine Langspalt-Presse 3, zugeführt, von wo aus sie weiterhin auf der Oberfläche der Profilwalze verbleibt und dann auf einen Krepp-Zylinder 4 überführt wird, der an der Profilwalze 1 anliegt.FIG. 7 shows the arrangement according to the invention using the example of a Paper machine for the production of crepe paper. It's from the right coming tape 500 to see on which the paper web is guided. The The tape is passed together with the paper web over a suction roll 200, which passes the paper web to a profile roller 1 with a rigid jacket. While the belt 500 is being fed back via a deflection roller, the paper web remains on the profile roller 1 and becomes a press nip, formed by the profile roller 1 and an extended nip press 3, supplied by where it remains on the surface of the profile roller and then on a crepe cylinder 4 is transferred, which rests on the profile roller 1.

    Claims (10)

    1. Press section for a papermachine for thin papers, with the following features:
      1.1 a press nip is provided which is formed by a last press unit and which is formed by a revolving, smooth surface in contact with the paper and a felted press roll (3, 600);
      characterized in that
      1.2 the smooth surface transfers the paper web (100) downstream of the press nip to a heated roll (4, 5, 7, 30, 1'), avoiding a free paper draw, and in that
      1.3 the smooth surface is the outer surface of a tubular roll with a dimensionally stable roll cover (1).
    2. Press section according to Claim 1, characterized in that the felted press roll (3) is an extended-nip press roll or a shoe-press roll.
    3. Press section according to Claims 1 and 2, characterized in that the smooth tubular roll (1) upstream of the press nip forms, with a further, felted press roll (2, 200, 300), a further pre-press nip located upstream of the press nip from feature 1.1.
    4. Press section according to Claim 3, characterized in that a separate, endless felt is provided for each of the two press nips.
    5. Press section according to either of Claims 3 and 4, characterized in that the further felted press roll is a shoe-press roll or an extended-nip press roll.
    6. Press section according to Claim 3, characterized in that in each case a single, common felt (10) is provided for both press nips.
    7. Press section according to one of Claims 3, 4 or 6, characterized that the further felted press roll (200) is a suction roll, whose suction zone is located predominantly upstream of the pre-press nip.
    8. Press section according to one of Claims 1 - 7, characterized in that the smooth tubular roll (1) is a controlled deflection roll.
    9. Press section according to one of Claims 1 - 8, characterized in that the heated roll (4) is an unfelted tubular roll which guides the web and transfers the web to a drying cylinder, preferably avoiding a free paper draw.
    10. Press section according to one of Claims 1 - 9, characterized in that the nip between the smooth tubular roll (1) and the heated roll (30), in particular of a drying cylinder, can be opened.
    EP94917672A 1993-05-29 1994-05-27 Press of paper machine for thin papers Expired - Lifetime EP0652992B2 (en)

    Applications Claiming Priority (5)

    Application Number Priority Date Filing Date Title
    DE4318036A DE4318036C1 (en) 1993-05-29 1993-05-29 Press unit of a paper machine for the production of tissue paper
    DE4318036 1993-05-29
    DE4321402 1993-06-26
    DE19934321402 DE4321402A1 (en) 1993-06-26 1993-06-26 Paper-making machine press section - has a smooth continuous surface as final unit to transfer web onwards in the prodn. of thin paper
    PCT/EP1994/001730 WO1994028240A1 (en) 1993-05-29 1994-05-27 Press of paper machine for thin papers

    Publications (3)

    Publication Number Publication Date
    EP0652992A1 EP0652992A1 (en) 1995-05-17
    EP0652992B1 EP0652992B1 (en) 1997-07-30
    EP0652992B2 true EP0652992B2 (en) 2000-11-02

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    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP94917672A Expired - Lifetime EP0652992B2 (en) 1993-05-29 1994-05-27 Press of paper machine for thin papers

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    US (1) US5670023A (en)
    EP (1) EP0652992B2 (en)
    JP (1) JPH08502104A (en)
    AT (1) ATE156208T1 (en)
    BR (1) BR9405408A (en)
    CA (1) CA2141292A1 (en)
    DE (1) DE59403546D1 (en)
    ES (1) ES2105720T3 (en)
    FI (1) FI950376A (en)
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    SE511485C2 (en) * 1998-02-04 1999-10-04 Valmet Karlstad Ab Paper machine and process for making a paper press web
    US6547924B2 (en) 1998-03-20 2003-04-15 Metso Paper Karlstad Ab Paper machine for and method of manufacturing textured soft paper
    US6159343A (en) * 1998-07-08 2000-12-12 Beloit Technologies, Inc. Press-to-dryer apparatus
    US6248210B1 (en) 1998-11-13 2001-06-19 Fort James Corporation Method for maximizing water removal in a press nip
    US6231723B1 (en) 1999-06-02 2001-05-15 Beloit Technologies, Inc Papermaking machine for forming tissue employing an air press
    SE514973C2 (en) * 1999-09-07 2001-05-21 Valmet Karlstad Ab Method and paper machine for making a liner
    ATE520820T1 (en) * 2007-12-20 2011-09-15 Stora Enso Oyj ARRANGEMENT FOR THE PRESS SECTION OF A MACHINE FOR PRODUCING A WEB OF MATERIAL AND CARDBOARD OR PAPER PRODUCED IN SUCH ARRANGEMENT
    AT509992B1 (en) * 2010-10-27 2012-01-15 Andritz Ag Maschf DEVICE AND METHOD FOR DRYING FIBROUS MATERIAL
    PL2910679T3 (en) * 2011-12-07 2017-09-29 Valmet Aktiebolag An extended nip roll for a papermaking machine and a method of producing tissue paper
    JP6157589B2 (en) 2012-04-19 2017-07-05 バルメット、アクチボラグValmet Aktiebolag Stretching nip roll, stretching nip press using the stretching nip roll, papermaking machine, and operating method of stretching nip press

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    Also Published As

    Publication number Publication date
    ES2105720T3 (en) 1997-10-16
    FI950376A0 (en) 1995-01-27
    JPH08502104A (en) 1996-03-05
    BR9405408A (en) 1999-09-08
    FI950376A (en) 1995-01-27
    EP0652992B1 (en) 1997-07-30
    DE59403546D1 (en) 1997-09-04
    CA2141292A1 (en) 1994-12-08
    US5670023A (en) 1997-09-23
    WO1994028240A1 (en) 1994-12-08
    EP0652992A1 (en) 1995-05-17
    ATE156208T1 (en) 1997-08-15

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