EP1111126B1 - Press section - Google Patents

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Publication number
EP1111126B1
EP1111126B1 EP00123972A EP00123972A EP1111126B1 EP 1111126 B1 EP1111126 B1 EP 1111126B1 EP 00123972 A EP00123972 A EP 00123972A EP 00123972 A EP00123972 A EP 00123972A EP 1111126 B1 EP1111126 B1 EP 1111126B1
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EP
European Patent Office
Prior art keywords
press
shoe
section according
equal
backing roll
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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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EP00123972A
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German (de)
French (fr)
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EP1111126A3 (en
EP1111126A2 (en
Inventor
Thomas Thoröe Scherb
Harald Schmidt-Hebbel
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Voith Patent GmbH
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Voith Paper Patent GmbH
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Publication of EP1111126A2 publication Critical patent/EP1111126A2/en
Publication of EP1111126A3 publication Critical patent/EP1111126A3/en
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Publication of EP1111126B1 publication Critical patent/EP1111126B1/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
    • D21F11/00Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/14Making cellulose wadding, filter or blotting paper

Definitions

  • the invention relates to a press section of a machine for production of tissue webs with a shoe press unit and a counter roller comprehensive shoe press, the shoe press unit at least two Press shoes and a flexible, liquid-tight guided over these press shoes Press belt has.
  • DE 32 05 664 A1 already has one for use in, for example a press section of a paper machine certain shoe roll with at least two press shoes known.
  • the press shoes are one by one Press plane parallel axis pivotable, and they can be in the Distinguish the radius of curvature. This ensures that for the whole Thickness spectrum of the types of paper produced on a paper machine optimal press work, i.e. the highest possible dry content can be achieved.
  • the aim of the invention is to provide a press section of the type mentioned to create, which enables a more economical production of tissue while ensuring better product quality.
  • the two Press shoes have different lengths measured in the direction of web travel and each between a rest position and a pressing position are shiftable, in which the respective press shoe is opposite the counter roller.
  • Tissue products have different quality requirements depending on their use posed. So there are products for which the specific Volume ("bulk”) is a crucial quality characteristic. With others Products may be more important for economic reasons, a little lower specific volume in favor of a high dry content, i.e. high production. Because of the invention Training is now possible in tissue production to switch between these varieties without this regarding the Machine or press setting a compromise must, as has been the case up to now. It is now possible to choose the optimal one Realize situation.
  • a shoe press unit is preferably a shoe press roll with a the press jacket forming the press belt is provided.
  • At least one press shoe is provided, its in the web running direction measured length greater than 80 mm, ⁇ 100 mm, preferably ⁇ 120 mm is.
  • the maximum pressing pressure is in a press nip between the press shoe and the counter roll in the web running direction Pressure course preferably less than or equal to a value of about 2.5 MPa selected, in particular ⁇ 2 MPa, preferably ⁇ 1.5 MPa.
  • At least one press shoe is provided whose length measured in the direction of web travel is less than or equal to 60 mm and in particular less than or equal to 50 mm and preferably one Has a value in the range of approximately 37 mm.
  • the maximum is Pressing pressure in a nip between the press shoe and the Counter roll in the web running direction resulting pressure course at a Shoe length less than or equal to 60 mm, preferably greater than or equal to one Value of 3.3 MPa, with a shoe length less than or equal to 50 mm preferably greater than or equal to a value of 4.3 MPa and at one Shoe length in the range of about 37 mm is preferably equal to a value selected in the range of about 4.8 MPa.
  • a heated drying cylinder serves as the counter roller and in particular a so-called Yankee cylinder is provided is that in the event that the shoe press unit by a Shoe press roll is formed, a much larger diameter than has the shoe press roll.
  • the maximum line force is due to inadmissibly large deformations and tensions of the Yankee cylinder often to a value of about 90 kN / m to 120 limited kN / m. This again limits the maximum pressing pressure for one long press shoe designed for high bulk and thus the one for the tissue web maximum achievable dryness. The result is a reduction the machine speed and a higher drying effort on the drying cylinder. By using a Shoe press with at least two different press shoes avoided this disadvantage.
  • a further increase in the dry matter content can be achieved that one between the shoe press unit and the counter roller, preferably a drying cylinder, formed felted press nip Angle between that applied to the counter roll at the end of the press nip Tangent and at least one running out of the press nip Felt advantageously ⁇ 10 °, in particular ⁇ 15 °, in particular ⁇ 18 ° and is preferably ⁇ 20 °.
  • Press belt have a circumferentially grooved surface that leads to a contributes to an additional increase in dryness.
  • a grooved press belt is therefore preferred when tissue types are used with the tissue machine are produced in which it is mainly due to high dryness arrives.
  • Figures 1 and 2 each show a machine in a schematic representation for producing a tissue web 10 (see also FIG. 3), the Press section includes a shoe press 12, one here by a Shoe press roll 14 formed shoe press unit and a counter roll which, in the case of the embodiments according to the figures 1 and 3 around a drying cylinder 16 and in the embodiment 2 is a conventional counter roll 18.
  • the shoe press rolls 14 each have two opposite one another Press shoes 20, 20 'and a guide over these press shoes 20, 20', formed by a flexible, liquid-tight press belt 22 on.
  • the two press shoes 20, 20 ' have a respective shoe press roll 14 different lengths l, l 'measured in the web running direction L (cf. in particular Figure 3). They are also each between a rest position R and a press position P, in which the respective press shoe 20, 20 'of the counter roll 16, 18 opposite.
  • the longer press shoe 20 can, for example, in the web running direction L measured length l greater than 80 mm. If the relevant press nip between such a press shoe 20 and the counter roller 16, 18th formed, so the maximum pressing pressure resulting in the press nip Pressure course in particular less than or equal to a value of approximately 2.5 MPa should be selected. In this case, a high specific volume can be achieved.
  • the maximum pressing pressure is in one Press nip between this press shoe 20 'and the counter roll 16, 18 in Web running direction L resulting pressure curve with a shoe length smaller or equal to 60 mm advantageously greater than or equal to a value of about 3.3 MPa, preferably with a shoe length less than or equal to 50 mm greater than or equal to a value of approximately 4.3 MPa and at one Shoe length in the range of about 37 mm is preferably equal to a value selected in the range of about 4.8 MPa. In such a case, a relative high dryness can be achieved.
  • a heated drying cylinder 16 and in particular, a so-called Yankee cylinder can be provided, the Diameter much larger than the diameter of the shoe press roll 14 is.
  • the one formed in particular by a drying cylinder or Yankee cylinder Counter roller 16 is assigned a scraper 34 through which the tissue web 10 is scraped off after drying.
  • the counter roll 18 is passed through formed a normal roller.
  • a top felt 36 and a Bottom felt 38 out are a top felt 36 and a Bottom felt 38 out.
  • the tissue web to be formed is through the upper felt 36 taken from a screen 42 coming from the wire section 40 and fed to the shoe press 12. Following this is the tissue web fed through the same top felt 36 to a drying cylinder 44.
  • the Press jacket 22 of the shoe press 14 preferably has in this case a circumferentially grooved surface.
  • the press belt 22 can in particular be blind-drilled and / or be grooved.
  • the two press shoes 20, 20 'can e.g. on a gunslinger 50 or the like is provided and jointly adjustable via this (see in particular Figures 2 and 3).

Abstract

Press section for a machine for producing tissue webs (10) comprises a shoe press unit (14) and a counter-roller (16). The unit is made up of two press shoes (20, 20')and a flexible, liquid-impermeable belt (22) which passes over them. These have different lengths (l. l') , measured around the circumference of the unit, and can be moved from a non-working position (R) to a press position (P) where they are in contact with the counter-roller.

Description

Die Erfindung betrifft eine Pressenpartie einer Maschine zur Herstellung von Tissuebahnen mit einer eine Schuhpreßeinheit und eine Gegenwalze umfassenden Schuhpresse, deren Schuhpreßeinheit wenigstens zwei Preßschuhe und ein über diese Preßschuhe geführtes flexibles, flüssigkeitsdichtes Preßband aufweist.The invention relates to a press section of a machine for production of tissue webs with a shoe press unit and a counter roller comprehensive shoe press, the shoe press unit at least two Press shoes and a flexible, liquid-tight guided over these press shoes Press belt has.

Aus der DE 32 05 664 A1 ist bereits eine beispielsweise für den Einsatz in einer Pressenpartie einer Papiermaschine bestimmte Schuhwalze mit wenigstens zwei Preßschuhen bekannt. Die Preßschuhe sind um eine zur Pressenebene parallele Achse schwenkbar, und sie können sich im Krümmungsradius unterscheiden. Dadurch wird erreicht, daß für das gesamte Dickenspektrum der auf einer Papiermaschine produzierten Papiersorten optimale Pressenarbeit geleistet, d.h. ein möglichst hoher Trockengehalt erreicht werden kann.DE 32 05 664 A1 already has one for use in, for example a press section of a paper machine certain shoe roll with at least two press shoes known. The press shoes are one by one Press plane parallel axis pivotable, and they can be in the Distinguish the radius of curvature. This ensures that for the whole Thickness spectrum of the types of paper produced on a paper machine optimal press work, i.e. the highest possible dry content can be achieved.

Eine Übertragung dieser Erkenntnisse führt bei der Tissueherstellung allerdings nicht zu einer Verbesserung der Produktqualität, da Tissuebahnen sehr dünn sind. Es bestehen nur unwesentliche Dickenunterschiede zwischen den verschiedenen Sorten. Die Anwendung ist somit aufgrund des größeren Investitionsaufwandes der beschriebenen Schuhpresse unwirtschaftlich. However, a transfer of these findings leads to tissue production does not improve product quality since tissue webs are very thin. There are only insignificant differences in thickness between the different varieties. The application is therefore due the greater investment in the shoe press described uneconomical.

Ziel der Erfindung ist es, eine Pressenpartie der eingangs genannten Art zu schaffen, die eine wirtschaftlichere Herstellung von Tissue ermöglicht und gleichzeitig eine bessere Produktqualität sicherstellt.The aim of the invention is to provide a press section of the type mentioned to create, which enables a more economical production of tissue while ensuring better product quality.

Diese Aufgabe wird nach der Erfindung dadurch gelöst, daß die beiden Preßschuhe unterschiedliche in Bahnlaufrichtung gemessene Längen besitzen und jeweils zwischen einer Ruheposition und einer Preßposition verlagerbar sind, in der der jeweilige Preßschuh der Gegenwalze gegenüberliegt.This object is achieved according to the invention in that the two Press shoes have different lengths measured in the direction of web travel and each between a rest position and a pressing position are shiftable, in which the respective press shoe is opposite the counter roller.

Indem die Preßschuhe zwischen einer Ruheposition und einer Preßposition verlagerbar sind, können schnell und ohne Umbauaufwand unterschiedlich lange Preßspalte verwirklicht werden.By placing the press shoes between a rest position and a press position can be relocated, can change quickly and without conversion work long press nips can be realized.

An Tissueprodukte werden je nach Verwendung unterschiedliche Qualitätsanforderungen gestellt. So gibt es Produkte, für die das spezifische Volumen ("Bulk") ein entscheidendes Qualitätsmerkmal ist. Bei anderen Produkten kann es aus wirtschaftlichen Gründen wichtiger sein, ein etwas niedrigeres spezifisches Volumen zugunsten eines hohen Trockengehaltes, d.h. einer hohen Produktion, in Kauf zu nehmen. Aufgrund der erfindungsgemäßen Ausbildung ist es nunmehr möglich, bei der Tissueproduktion zwischen diesen Sorten zu wechseln, ohne daß dazu bezüglich der Maschinen- oder Presseneinstellung ein Kompromiß geschlossen werden muß, wie dies bisher der Fall war. Es läßt sich nunmehr jeweils die optimale Situation verwirklichen.Tissue products have different quality requirements depending on their use posed. So there are products for which the specific Volume ("bulk") is a crucial quality characteristic. With others Products may be more important for economic reasons, a little lower specific volume in favor of a high dry content, i.e. high production. Because of the invention Training is now possible in tissue production to switch between these varieties without this regarding the Machine or press setting a compromise must, as has been the case up to now. It is now possible to choose the optimal one Realize situation.

Als Schuhpreßeinheit ist vorzugsweise eine Schuhpreßwalze mit einem das Preßband bildenden Preßmantel vorgesehen. As a shoe press unit is preferably a shoe press roll with a the press jacket forming the press belt is provided.

Zur Erzielung eines hohen spezifischen Volumens ist es von Vorteil, wenn wenigstens ein Preßschuh vorgesehen ist, dessen in Bahnlaufrichtung gemessene Länge größer als 80 mm, ≥ 100 mm, vorzugsweise ≥ 120 mm ist. Dabei ist der maximale Preßdruck des sich in einem Preßspalt zwischen dem Preßschuh und der Gegenwalze in Bahnlaufrichtung ergebenden Druckverlaufs vorzugsweise kleiner oder gleich einem Wert von etwa 2,5 MPa gewählt, insbesondere ≤ 2 MPa, vorzugsweise ≤ 1,5 MPa.To achieve a high specific volume, it is advantageous if at least one press shoe is provided, its in the web running direction measured length greater than 80 mm, ≥ 100 mm, preferably ≥ 120 mm is. The maximum pressing pressure is in a press nip between the press shoe and the counter roll in the web running direction Pressure course preferably less than or equal to a value of about 2.5 MPa selected, in particular ≤ 2 MPa, preferably ≤ 1.5 MPa.

Andererseits ist es zur Erzielung eines möglichst hohen Trockengehalts nach der Presse von Vorteil, wenn wenigstens ein Preßschuh vorgesehen ist, dessen in Bahnlaufrichtung gemessene Länge kleiner oder gleich 60 mm und insbesondere kleiner oder gleich 50 mm ist und vorzugsweise einen Wert im Bereich von etwa 37 mm besitzt. Dabei ist der maximale Preßdruck des sich in einem Preßspalt zwischen dem Preßschuh und der Gegenwalze in Bahnlaufrichtung ergebenden Druckverlaufs bei einer Schuhlänge kleiner oder gleich 60 mm vorzugsweise größer oder gleich einem Wert von 3,3 MPa, bei einer Schuhlänge kleiner oder gleich 50 mm vorzugsweise größer oder gleich einem Wert von 4,3 MPa und bei einer Schuhlänge im Bereich von etwa 37 mm vorzugsweise gleich einem Wert im Bereich von etwa 4,8 MPa gewählt.On the other hand, it is to achieve the highest possible dry content after the press is an advantage if at least one press shoe is provided whose length measured in the direction of web travel is less than or equal to 60 mm and in particular less than or equal to 50 mm and preferably one Has a value in the range of approximately 37 mm. The maximum is Pressing pressure in a nip between the press shoe and the Counter roll in the web running direction resulting pressure course at a Shoe length less than or equal to 60 mm, preferably greater than or equal to one Value of 3.3 MPa, with a shoe length less than or equal to 50 mm preferably greater than or equal to a value of 4.3 MPa and at one Shoe length in the range of about 37 mm is preferably equal to a value selected in the range of about 4.8 MPa.

Von besonderem Vorteil ist, wenn als Gegenwalze ein beheizbarer Trokkenzylinder und insbesondere ein sogenannter Yankee-Zylinder vorgesehen ist, der in dem Fall, daß die Schuhpreßeinheit durch eine Schuhpreßwalze gebildet ist, einen wesentlich größeren Durchmesser als die Schuhpreßwalze besitzt. It is particularly advantageous if a heated drying cylinder serves as the counter roller and in particular a so-called Yankee cylinder is provided is that in the event that the shoe press unit by a Shoe press roll is formed, a much larger diameter than has the shoe press roll.

Bei der Verwendung eines Yankee-Zylinders ist die maximale Linienkraft aufgrund auftretender unzulässig großer Verformungen und Spannungen des Yankee-Zylinders oftmals auf einen Wert von etwa 90 kN/m bis 120 kN/m begrenzt. Dies begrenzt wieder den maximalen Preßdruck für einen auf hohen Bulk ausgelegten langen Preßschuh und damit den für die Tissuebahn maximal erreichbaren Trockengehalt. Die Folge ist eine Reduzierung der Maschinengeschwindigkeit und ein höherer Trocknungsaufwand am Trockenzylinder. Durch die erfindungsgemäße Verwendung einer Schuhpresse mit wenigstens zwei unterschiedlichen Preßschuhen wird dieser Nachteil vermieden.When using a Yankee cylinder, the maximum line force is due to inadmissibly large deformations and tensions of the Yankee cylinder often to a value of about 90 kN / m to 120 limited kN / m. This again limits the maximum pressing pressure for one long press shoe designed for high bulk and thus the one for the tissue web maximum achievable dryness. The result is a reduction the machine speed and a higher drying effort on the drying cylinder. By using a Shoe press with at least two different press shoes avoided this disadvantage.

Eine weitere Steigerung des Trockengehalts kann dadurch erreicht werden, daß bei einem zwischen der Schuhpreßeinheit und der Gegenwalze, vorzugsweise einem Trockenzylinder, gebildeten befilzten Preßspalt der Winkel zwischen der am Ende des Preßspaltes an die Gegenwalze angelegten Tangente und wenigstens einem aus dem Preßspalt auslaufenden Filz vorteilhafterweise ≥ 10°, insbesondere ≥ 15°, insbesondere ≥ 18° und vorzugsweise ≥ 20° ist. Insbesondere in einem solchen Fall kann das Preßband eine in Umfangsrichtung gerillte Oberfläche besitzen, die zu einer zusätzlichen Trockengehaltssteigerung beiträgt. Ein gerilltes Preßband wird daher bevorzugt eingesetzt, wenn mit der Tissuemaschine Tissuesorten produziert werden, bei denen es hauptsächlich auf hohe Trockengehalte ankommt.A further increase in the dry matter content can be achieved that one between the shoe press unit and the counter roller, preferably a drying cylinder, formed felted press nip Angle between that applied to the counter roll at the end of the press nip Tangent and at least one running out of the press nip Felt advantageously ≥ 10 °, in particular ≥ 15 °, in particular ≥ 18 ° and is preferably ≥ 20 °. In such a case, in particular Press belt have a circumferentially grooved surface that leads to a contributes to an additional increase in dryness. A grooved press belt is therefore preferred when tissue types are used with the tissue machine are produced in which it is mainly due to high dryness arrives.

Ansonsten kann insbesondere ein blindgebohrtes und/oder gerilltes Preßband eingesetzt werden. Otherwise, especially a blind drilled and / or grooved press belt be used.

Die Erfindung wird im folgenden anhand von Ausführungsbeispielen unter Bezugnahme auf die Zeichnung näher beschrieben; in dieser zeigen:

Figur 1
eine schematische Darstellung einer ersten Ausführungsform einer Maschine zur Herstellung einer Tissuebahn mit einer eine Schuhpresse umfassenden Pressenpartie,
Figur 2
eine schematische Darstellung einer weiteren Ausführungsform einer solchen der Herstellung einer Tissuebahn dienenden Maschine und
Figur 3
eine vergrößerte schematische Teildarstellung einer in einer solchen Tissuemaschine einsetzbaren Schuhpresse.
The invention is described below with reference to exemplary embodiments with reference to the drawing; in this show:
Figure 1
1 shows a schematic representation of a first embodiment of a machine for producing a tissue web with a press section comprising a shoe press,
Figure 2
a schematic representation of a further embodiment of such a machine for the production of a tissue web and
Figure 3
an enlarged schematic partial view of a shoe press that can be used in such a tissue machine.

Die Figuren 1 und 2 zeigen in schematischer Darstellung jeweils eine Maschine zur Herstellung einer Tissuebahn 10 (vgl. auch Figur 3), deren Pressenpartie eine Schuhpresse 12 umfaßt, die eine hier durch eine Schuhpreßwalze 14 gebildete Schuhpreßeinheit und eine Gegenwalze aufweist, bei der es sich im Fall der Ausführungsformen gemäß den Figuren 1 und 3 um einen Trockenzylinder 16 und bei der Ausführungsform gemäß Figur 2 um eine herkömmliche Gegenwalze 18 handelt.Figures 1 and 2 each show a machine in a schematic representation for producing a tissue web 10 (see also FIG. 3), the Press section includes a shoe press 12, one here by a Shoe press roll 14 formed shoe press unit and a counter roll which, in the case of the embodiments according to the figures 1 and 3 around a drying cylinder 16 and in the embodiment 2 is a conventional counter roll 18.

Die Schuhpreßwalzen 14 weisen jeweils zwei einander gegenüberliegende Preßschuhe 20, 20' und einen über diese Preßschuhe 20, 20' geführten, durch ein flexibles, flüssigkeitsdichtes Preßband gebildeten Preßmantel 22 auf. The shoe press rolls 14 each have two opposite one another Press shoes 20, 20 'and a guide over these press shoes 20, 20', formed by a flexible, liquid-tight press belt 22 on.

Die beiden Preßschuhe 20, 20' einer jeweiligen Schuhpreßwalze 14 besitzen unterschiedliche in Bahnlaufrichtung L gemessene Längen l, l' (vgl. insbesondere Figur 3). Sie sind überdies jeweils zwischen einer Ruheposition R und einer Preßposition P verlagerbar, in der der jeweilige Preßschuh 20, 20' der Gegenwalze 16, 18 gegenüberliegt.The two press shoes 20, 20 'have a respective shoe press roll 14 different lengths l, l 'measured in the web running direction L (cf. in particular Figure 3). They are also each between a rest position R and a press position P, in which the respective press shoe 20, 20 'of the counter roll 16, 18 opposite.

Der längere Preßschuh 20 kann beispielsweise eine in Bahnlaufrichtung L gemessene Länge l größer als 80 mm besitzen. Wird der betreffende Preßspalt zwischen einem solchen Preßschuh 20 und der Gegenwalze 16, 18 gebildet, so kann der maximale Preßdruck des sich im Preßspalt ergebenden Druckverlaufs insbesondere kleiner oder gleich einem Wert von etwa 2,5 MPa gewählt sein. In diesem Fall kann ein hohes spezifisches Volumen erreicht werden.The longer press shoe 20 can, for example, in the web running direction L measured length l greater than 80 mm. If the relevant press nip between such a press shoe 20 and the counter roller 16, 18th formed, so the maximum pressing pressure resulting in the press nip Pressure course in particular less than or equal to a value of approximately 2.5 MPa should be selected. In this case, a high specific volume can be achieved.

Die in Bahnlaufrichtung L gemessene Länge l' des anderen Preßschuhs 20' kann insbesondere kleiner oder gleich 60 mm und insbesondere kleiner oder gleich 50 mm sein und vorzugsweise einen Wert im Bereich von etwa 37 mm besitzen. Dabei ist der maximale Preßdruck des sich in einem Preßspalt zwischen diesem Preßschuh 20' und der Gegenwalze 16, 18 in Bahnlaufrichtung L ergebenden Druckverlaufs bei einer Schuhlänge kleiner oder gleich 60 mm vorteilhafterweise größer oder gleich einem Wert von etwa 3,3 MPa, bei einer Schuhlänge kleiner oder gleich 50 mm vorzugsweise größer oder gleich einem Wert von etwa 4,3 MPa und bei einer Schuhlänge im Bereich von etwa 37 mm vorzugsweise gleich einem Wert im Bereich von etwa 4,8 MPa gewählt. In einem solchen Fall kann ein relativ hoher Trockengehalt erzielt werden. The length l 'of the other press shoe measured in the web running direction L. 20 'can in particular be less than or equal to 60 mm and in particular less or equal to 50 mm and preferably a value in the range of about 37 mm. The maximum pressing pressure is in one Press nip between this press shoe 20 'and the counter roll 16, 18 in Web running direction L resulting pressure curve with a shoe length smaller or equal to 60 mm advantageously greater than or equal to a value of about 3.3 MPa, preferably with a shoe length less than or equal to 50 mm greater than or equal to a value of approximately 4.3 MPa and at one Shoe length in the range of about 37 mm is preferably equal to a value selected in the range of about 4.8 MPa. In such a case, a relative high dryness can be achieved.

Als Gegenwalze kann beispielsweise ein beheizter Trockenzylinder 16 und insbesondere ein sogenannter Yankee-Zylinder vorgesehen sein, dessen Durchmesser wesentlich größer als der Durchmesser der Schuhpreßwalze 14 ist.A heated drying cylinder 16 and in particular, a so-called Yankee cylinder can be provided, the Diameter much larger than the diameter of the shoe press roll 14 is.

Bei der Ausführungsform gemäß Figur 1 ist durch den zwischen der Schuhpreßwalze 14 und diesem Trockenzylinder 16 gebildeten Preßspalt ein Filz 24 geführt, der dem Preßspalt über eine Saugwalze 26 zugeführt wird. Der Filz 24 umspannt zusammen mit einem Blattbildungssieb 28 eine Formierwalze 30, in deren Bereich ein Stoffauflauf 32 vorgesehen ist.In the embodiment of Figure 1 is by the between Shoe press roll 14 and this drying cylinder 16 formed press nip a felt 24 is fed to the press nip via a suction roll 26 becomes. The felt 24 spans together with a sheet forming screen 28 a forming roller 30, in the area of which a headbox 32 is provided.

Der insbesondere durch einen Trockenzylinder oder Yankee-Zylinder gebildeten Gegenwalze 16 ist ein Schaber 34 zugeordnet, durch den die Tissuebahn 10 nach erfolgter Trocknung abgeschabt wird.The one formed in particular by a drying cylinder or Yankee cylinder Counter roller 16 is assigned a scraper 34 through which the tissue web 10 is scraped off after drying.

Bei der Ausführungsform gemäß Figur 2 wird die Gegenwalze 18 durch eine normale Walze gebildet. Durch den zwischen der Schuhpreßwalze 22 und der Gegenwalze 18 gebildeten Preßspalt sind ein Oberfilz 36 und ein Unterfilz 38 geführt. Die zu bildende Tissuebahn wird durch den Oberfilz 36 von einem von der Siebpartie 40 kommenden Sieb 42 übernommen und der Schuhpresse 12 zugeführt. Im Anschluß daran wird die Tissuebahn durch denselben Oberfilz 36 einem Trockenzylinder 44 zugeführt.In the embodiment according to FIG. 2, the counter roll 18 is passed through formed a normal roller. By between the shoe press roll 22nd and the nip 18 formed nip are a top felt 36 and a Bottom felt 38 out. The tissue web to be formed is through the upper felt 36 taken from a screen 42 coming from the wire section 40 and fed to the shoe press 12. Following this is the tissue web fed through the same top felt 36 to a drying cylinder 44.

Wie sich aus der Figur 3 ergibt, kann der Winkel α zwischen der am Ende des befilzten Preßspaltes der Schuhpresse 12 an die Gegenwalze, hier den Trockenzylinder oder Yankee-Zylinder 16, angelegten Tangente 46 und dem aus dem Preßspalt auslaufenden Filz 48 insbesondere ≥ 20° sein. Der Preßmantel 22 der Schuhpresse 14 besitzt in diesem Fall vorzugsweise eine in Umfangsrichtung gerillte Oberfläche.As can be seen from FIG. 3, the angle α between that at the end of the felted press nip of the shoe press 12 to the counter roller, here the Drying cylinder or Yankee cylinder 16, tangent 46 and the felt 48 running out of the press nip, in particular ≥ 20 °. The Press jacket 22 of the shoe press 14 preferably has in this case a circumferentially grooved surface.

Ansonsten kann das Preßband 22 insbesondere blindgebohrt und/oder gerillt sein.Otherwise, the press belt 22 can in particular be blind-drilled and / or be grooved.

Die beiden Preßschuhe 20, 20' können z.B. an einem Revolverträger 50 oder dergleichen vorgesehen und über diesen gemeinsam verstellbar sein (vgl. insbesondere die Figuren 2 und 3). The two press shoes 20, 20 'can e.g. on a gunslinger 50 or the like is provided and jointly adjustable via this (see in particular Figures 2 and 3).

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
Tissuebahntissue web
1212
Schuhpresseshoe press
1414
Schuhpreßeinheit, SchuhpreßwalzeShoe press unit, shoe press roller
1616
Gegenwalze, Trockenzylinder, Yankee-ZylinderCounter roll, drying cylinder, Yankee cylinder
1818
Gegenwalzebacking roll
2020
Preßschuhpress shoe
20'20 '
Preßschuhpress shoe
2222
Preßband, PreßmantelPress belt, press jacket
2424
Filzfelt
2626
Saugwalzesuction roll
2828
Blattbildungssiebforming wire
3030
Formierwalzeforming roll
3232
Stoffauflaufheadbox
3434
Schaberscraper
3636
Oberfilzoverfelt
3838
Unterfilzbottom felt
4040
SiebpartieWire section
4242
Siebscree
4444
Trockenzylinderdrying cylinders
4646
Tangentetangent
4848
Filzfelt
5050
Revolverträger revolver carrier
LL
BahnlaufrichtungWeb direction
PP
Preßpositionpressing position
RR
Ruhepositionrest position
ll
SchuhlängeShoe length
l'l '
SchuhlängeShoe length

Claims (12)

  1. Press section for a machine for producing tissue webs (10), having a shoe press (12) which comprises a shoe press unit (14) and a backing roll (16, 18) and whose shoe press unit (14) has at least two press shoes (20, 20') and a flexible, liquid-tight press belt (22) guided over these press shoes (20, 20'),
    characterized in that the two press shoes (20, 20') have lengths (l, l') which are different as measured in the web running direction (L) and can in each case be displaced between a rest position (R) and a pressing position (P), in which the respective press shoe (20, 20') is opposite the backing roll (16, 18).
  2. Press section according to Claim 1, characterized in that the shoe press unit provided is a shoe press roll (14) with a press cover (22) forming the press belt.
  3. Press section according to one of the preceding claims, characterized in that at least one press shoe (20) is provided, whose length (l) as measured in the web running direction (L) is greater than 80 mm.
  4. Press section according to Claim 3, characterized in that the maximum pressing pressure of the pressure profile which results in the web running direction (L) in a press nip between the press shoe (20) and the backing roll (16, 18) is chosen to be less than or equal to a value of about 2.5 MPa.
  5. Press section according to one of the preceding claims, characterized in that at least one press shoe (20') is provided, whose length (l') as measured in the web running direction (L) is less than or equal to 60 mm and in particular less than or equal to 50 mm and preferably has a value in the region of about 37 mm.
  6. Press section according to Claim 5, characterized in that, with a shoe length (l') of less than or equal to 60 mm, the maximum pressing pressure of the pressure profile which results in the web running direction (L) in a press nip between the press shoe (20' ) and the backing roll (16, 18) is chosen to be greater than or equal to a value of about 3.3 MPa.
  7. Press section according to Claim 5, characterized in that, with a shoe length (l') of less than or equal to 50 mm, the maximum pressing pressure of the pressure profile which results in the web running direction (L) in a press nip between the press shoe (20') and the backing roll (16, 18) is chosen to be greater than or equal to a value of about 4.3 MPa.
  8. Press section according to Claim 5, characterized in that, with a shoe length (l') in the region of about 37 mm, the maximum pressing pressure of the pressure profile which results in the web running direction (L) in a press nip between the press shoe (20') and the backing roll (16, 18) is chosen to be equal to a value in the region of about 4.8 MPa.
  9. Press section according to one of the preceding claims, characterized in that the backing roll provided is a heatable drying cylinder (16) and, in particular, what is known as a Yankee cylinder.
  10. Press section according to one of the preceding claims, characterized in that the press nip formed between the shoe press unit (14) and the backing roll (16, 18), preferably a drying cylinder (16), is felted, and in that the angle (α) between the tangent (46) to the backing roll (16, 18) at the end of the press nip and at least one felt (48) running out of the press nip is ≥ 10°, in particular ≥ 15°, in particular ≥ 18° and preferably ≥ 20°.
  11. Press section according to Claim 10, characterized in that the press belt (22) has a surface which is grooved in the circumferential direction.
  12. Press section according to one of the preceding claims, characterized in that the press belt (22) is blind-drilled and/or grooved.
EP00123972A 1999-12-23 2000-11-03 Press section Expired - Lifetime EP1111126B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19962706 1999-12-23
DE19962706A DE19962706A1 (en) 1999-12-23 1999-12-23 Press section

Publications (3)

Publication Number Publication Date
EP1111126A2 EP1111126A2 (en) 2001-06-27
EP1111126A3 EP1111126A3 (en) 2001-08-16
EP1111126B1 true EP1111126B1 (en) 2004-12-08

Family

ID=7934296

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00123972A Expired - Lifetime EP1111126B1 (en) 1999-12-23 2000-11-03 Press section

Country Status (7)

Country Link
US (1) US6514385B2 (en)
EP (1) EP1111126B1 (en)
AT (1) ATE284465T1 (en)
BR (1) BRPI0006405A2 (en)
CA (1) CA2329497C (en)
DE (2) DE19962706A1 (en)
PL (1) PL196245B1 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10129613A1 (en) * 2001-06-20 2003-01-02 Voith Paper Patent Gmbh Method and device for producing a fibrous web provided with a three-dimensional surface structure
DE10158717A1 (en) * 2001-11-29 2003-06-12 Voith Paper Patent Gmbh press roll
DE10233920A1 (en) * 2002-07-25 2004-02-12 Voith Paper Patent Gmbh Papermaking machine dewaters tissue paper or web of fibrous hygiene web material in conjunction with a dewatering belt with reversible water take-up
DE10326304A1 (en) 2003-06-11 2005-02-03 Voith Fabrics Patent Gmbh Method and device for producing a tissue web
US7297233B2 (en) * 2004-01-30 2007-11-20 Voith Paper Patent Gmbh Dewatering apparatus in a paper machine
SE529130C2 (en) * 2004-05-26 2007-05-08 Metso Paper Karlstad Ab Paper machine for manufacturing fiber web of paper, comprises clothing that exhibits three-dimensional structure for structuring fiber web
DE102004048156A1 (en) * 2004-10-02 2006-04-06 Voith Paper Patent Gmbh Pressing device in a press section of a machine for producing a fibrous web
AT505760B1 (en) * 2008-01-09 2009-04-15 Andritz Ag Maschf DEVICE AND METHOD FOR TAPPING A MATERIAL RAIL
AT508331B1 (en) * 2009-05-19 2011-05-15 Andritz Ag Maschf METHOD AND DEVICE FOR TREATING A FIBROUS CAR TRACK IN A LANGNIP PRESS UNIT
JP5716378B2 (en) * 2010-12-17 2015-05-13 王子ホールディングス株式会社 Fiber sheet manufacturing equipment

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3205664A1 (en) 1982-02-17 1983-08-25 J.M. Voith Gmbh, 7920 Heidenheim PRESS FOR DRAINAGE OF WET FIBER SHEETS
DE3317456C2 (en) * 1983-04-02 1993-12-02 Voith Gmbh J M Belt press unit for dewatering fibrous webs
DE3503819A1 (en) * 1984-12-21 1986-06-26 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Hydraulic press shoe and its use and operation
US5639351A (en) 1991-12-23 1997-06-17 Valmet Corporation Press section of a paper machine, in particular for printing paper qualities
FI98844C (en) * 1991-12-23 1997-08-25 Valmet Paper Machinery Inc Press section in paper machine, especially for printing paper grades
DE4301750C2 (en) * 1993-01-23 1996-10-10 Voith Gmbh J M Method and device for dewatering a web using presses
DE19652018A1 (en) * 1996-12-13 1998-06-18 Voith Sulzer Papiermasch Gmbh Press section
DE19654198A1 (en) * 1996-12-23 1998-06-25 Voith Sulzer Papiermasch Gmbh Machine for the production of a fibrous web
DE19756422A1 (en) * 1997-12-18 1999-06-24 Voith Sulzer Papiertech Patent Machine for producing a fibrous web, in particular a tissue paper web

Also Published As

Publication number Publication date
PL344740A1 (en) 2001-07-02
BRPI0006405A2 (en) 2017-01-17
DE19962706A1 (en) 2001-06-28
CA2329497A1 (en) 2001-06-23
ATE284465T1 (en) 2004-12-15
PL196245B1 (en) 2007-12-31
US6514385B2 (en) 2003-02-04
EP1111126A3 (en) 2001-08-16
CA2329497C (en) 2009-02-10
EP1111126A2 (en) 2001-06-27
US20020096302A1 (en) 2002-07-25
DE50008900D1 (en) 2005-01-13

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