EP1959052B1 - Shoe press roll - Google Patents

Shoe press roll Download PDF

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Publication number
EP1959052B1
EP1959052B1 EP07122713A EP07122713A EP1959052B1 EP 1959052 B1 EP1959052 B1 EP 1959052B1 EP 07122713 A EP07122713 A EP 07122713A EP 07122713 A EP07122713 A EP 07122713A EP 1959052 B1 EP1959052 B1 EP 1959052B1
Authority
EP
European Patent Office
Prior art keywords
press
press roll
roll according
shoe
layers
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.)
Not-in-force
Application number
EP07122713A
Other languages
German (de)
French (fr)
Other versions
EP1959052A1 (en
Inventor
Eckart Krägeloh
Christian Müller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Priority to PL07122713T priority Critical patent/PL1959052T3/en
Publication of EP1959052A1 publication Critical patent/EP1959052A1/en
Application granted granted Critical
Publication of EP1959052B1 publication Critical patent/EP1959052B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/006—Calenders; Smoothing apparatus with extended nips

Definitions

  • the invention relates to a press roll for smoothing or dewatering a paper, board, tissue or other fibrous web in a machine for producing and / or finishing the same with a flexible roll shell, which is of a press shoe with concave pressing surface to form a press nip in the direction a pressing roller is pressed, wherein the press shoe comprises three layers lying in the pressing direction, of which the middle layer has an increased compressibility.
  • One-piece press shoes are predominantly made of bronze or steel. In the case of counter-rolls with a faulty contour, this results in irregular line force curves.
  • a shoe press roll known with a press shoe, which is formed of 3 layers, of which the middle layer has an increased compressibility.
  • the object of the invention is therefore to increase the flexibility of the press shoe without affecting the line force profile.
  • the middle layer has an E-modulus between 5 and 50 MPa.
  • the press shoe consists of 3 superimposed layers, of which the middle has an increased compressibility and has an E-modulus between 5 and 50 MPa.
  • the layers should have a thickness that is between 15 and 45%, preferably between 20 and 40%, of the thickness of the press shoe.
  • the layers may have approximately the same thickness.
  • At least one layer preferably the outer and in particular the outer and the inner layer should be made of steel.
  • the compressible layer of a compressible material, in particular plastic preferably made of a material having a transverse strain of less than 0.5 and / or the compressible layer recesses, preferably in the web running direction grooves have.
  • the press shoe should be pressed by at least one row of axially juxtaposed Anpresskolben o. ⁇ . Pressing the counter roll.
  • the distance between the centers of the Anpresskolben a row should be between 1.5 and 2 times the diameter of the Anpresskolben. At this distance results in a relatively flat line force distribution.
  • the press roll shown in the figures has a flexible roll shell 1 made of fiber-reinforced plastic, which is pressed by a press shoe 2 to a cylindrical counter-roller 9. Since the press shoe 2 has a concave pressing surface facing the mating roll 9, the roll mantle 1 can adapt to the contour of the mating roll 9.
  • one or more dewatering belts are preferably guided in the form of press felts for receiving the water pressed out in the press nip.
  • this consists of three layers 3,4,5, an inner layer 5 made of steel, a compressible, middle layer 4 of a compressible plastic and a radially outer layer 3 also made of steel.
  • the steel layers 3.5 give the press shoe 2 the necessary dimensional stability and counteract excessive ripple in the line pressure curve in the press nip.
  • the middle layer of the plastic used for this purpose has the smallest possible modulus of elasticity between 5 and 50 MPa and a transverse strain of less than 0.5.
  • the distance between the pressing piston 6 a row is as small as possible.
  • the centers of adjacent pressing pistons 2 have a distance 8 of slightly more than 1.5 times the diameter of the pressing pistons 2.
  • the distance 7 between the center of the outermost pressing piston 2 and the edge is approximately 0.75 times the diameter of the pressing piston 2.

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  • Paper (AREA)
  • Press Drives And Press Lines (AREA)
  • Rolls And Other Rotary Bodies (AREA)

Abstract

The press roller has a flexible roller cover (1) pressed by a press shoe (2) with a concave press surface for formation of a press gap in a direction of an impression roller. The press shoe has outer, central and inner layers (3, 4, 5) lying one upon the other in a press direction. The central layer has an increased compressibility and a modulus of elasticity of 5-50 MPa. The outer and inner layers are made of steel. The central layer is made of a compressible material i.e. plastic. The press shoe is pressed to the impression roller by a hydraulic pressing piston (6).

Description

Die Erfindung betrifft eine Presswalze zur Glättung oder Entwässerung einer Papier-, Karton-, Tissue- oder einer anderen Faserstoffbahn in einer Maschine zur Herstellung und/oder Veredlung derselben mit einem flexiblen Walzenmantel, der von einem Pressschuh mit konkaver Pressfläche zur Bildung eines Pressspaltes in Richtung einer Gegenwalze gedrückt wird, wobei der Pressschuh drei in Pressrichtung übereinander liegende Schichten umfasst, von denen die mittlere Schicht eine erhöhte Kompressibilität aufweist.The invention relates to a press roll for smoothing or dewatering a paper, board, tissue or other fibrous web in a machine for producing and / or finishing the same with a flexible roll shell, which is of a press shoe with concave pressing surface to form a press nip in the direction a pressing roller is pressed, wherein the press shoe comprises three layers lying in the pressing direction, of which the middle layer has an increased compressibility.

Einteilige Pressschuhe bestehen überwiegend aus Bronze oder Stahl. Bei Gegenwalzen mit fehlerhafter Kontur ergeben sich dabei unregelmäßige Linienkraftverläufe.One-piece press shoes are predominantly made of bronze or steel. In the case of counter-rolls with a faulty contour, this results in irregular line force curves.

Da der Pressschuh nicht genügend flexibel ist ergeben sich insbesondere am Rand Anpassungsprobleme.Since the press shoe is not sufficiently flexible, adaptation problems arise, especially at the edge.

Bekannte Zwischenschichten in Pressschuhen dienen überwiegend der thermischen Isolierung und bewirken keine ausreichende Flexibilität.Known intermediate layers in press shoes are mainly used for thermal insulation and cause sufficient flexibility.

Wird der Pressschuh allerdings zu flexibel, so verstärkt sich die Liniendruck-Welligkeit zwischen den Anpresskolben, was vor allem bei der Entwässerung der Faserstoffbahn zu einer stärkeren Welligkeit des Feuchtequerprofils führt.However, if the press shoe becomes too flexible, the line pressure ripple increases between the contact pressure pistons, which leads to a greater ripple in the moisture profile, especially when dewatering the fibrous web.

Aus der WO2004/011721 ist eine Schuhpresswalze bekannt mit einem Pressschuh, der aus 3 Schichten gebildet ist, von denen die mittlere Schicht eine erhöhte Kompressibilität hat.From the WO2004 / 011721 is a shoe press roll known with a press shoe, which is formed of 3 layers, of which the middle layer has an increased compressibility.

Die Aufgabe der Erfindung ist es daher die Flexibilität des Pressschuhs ohne Beeinträchtigungen des Linienkraftprofils zu erhöhen.The object of the invention is therefore to increase the flexibility of the press shoe without affecting the line force profile.

Erfindungsgemäß wurde die Aufgabe dadurch gelöst, dass die mittlere Schicht einen E-Modul zwischen 5 und 50 MPa aufweist.According to the invention, this object is achieved in that the middle layer has an E-modulus between 5 and 50 MPa.

Insbesondere besteht der Pressschuh aus 3 übereinander liegenden Schichten, von denen die mittlere eine erhöhte Kompressibilität aufweist und einen E-Modul zwischen 5 und 50 MPa hat.In particular, the press shoe consists of 3 superimposed layers, of which the middle has an increased compressibility and has an E-modulus between 5 and 50 MPa.

Durch die elastische, mittlere Schicht wird der Pressschuh flexibler, so dass er sich besser der Kontur der Gegenwalze anpassen kann. Die Stabilität der inneren und der äußeren Schicht sorgt dabei dafür, dass sich die Liniendruck-Welligkeit zwischen den Anpresskolben nicht erhöht.Due to the elastic, middle layer of the press shoe is more flexible, so that it can better adapt to the contour of the backing roll. The stability of the inner and the outer layer ensures that the line pressure ripple between the Anpresskolben does not increase.

Damit sich die Vorteile der Schichten entsprechend auf die Gesamtwirkung erstrecken, sollten die Schichten eine Dicke aufweisen, die zwischen 15 und 45 %, vorzugsweise zwischen 20 und 40% der Dicke des Pressschuhs liegt.In order for the benefits of the layers to be commensurate with the overall effect, the layers should have a thickness that is between 15 and 45%, preferably between 20 and 40%, of the thickness of the press shoe.

Dabei kann es vorteilhaft sein, wenn die Schichten etwa die gleiche Dicke aufweisen.It may be advantageous if the layers have approximately the same thickness.

Im Interesse einer einfachen Herstellbarkeit, aber auch der Gewährleistung einer ausreichenden Formstabilität des Pressschuhs sollte wenigstens eine Schicht, vorzugsweise die äußere und insbesondere die äußere und die innere Schicht aus Stahl bestehen.In the interest of ease of manufacture, but also to ensure adequate dimensional stability of the press shoe, at least one layer, preferably the outer and in particular the outer and the inner layer should be made of steel.

Um eine ausreichende Kompressibilität der mittleren Schicht zu erreichen, sollte die kompressible Schicht aus einem kompressiblem Material, insbesondere Kunststoff, vorzugsweise aus einem Material mit einer Querdehnzahl von weniger als 0,5 bestehen und/oder sollte die kompressible Schicht Aussparungen, vorzugsweise in Bahnlaufrichtung verlaufende Nuten besitzen.In order to achieve sufficient compressibility of the middle layer, the compressible layer of a compressible material, in particular plastic, preferably made of a material having a transverse strain of less than 0.5 and / or the compressible layer recesses, preferably in the web running direction grooves have.

Dabei sollte der Pressschuh von wenigstens einer Reihe von axial nebeneinander angeordneten Anpresskolben o. ä. Anpresselementen zur Gegenwalze gedrückt werden.In this case, the press shoe should be pressed by at least one row of axially juxtaposed Anpresskolben o. Ä. Pressing the counter roll.

Bei Pressspalten, die eine hohe Genauigkeit erfordern, insbesondere langen Pressspalten ist es zur Bildung eines gewünschten Pressdruckverlaufs in Bahnlaufrichtung von Vorteil, wenn in Bahnlaufrichtung mehrere, vorzugsweise zwei quer zur Bahnlaufrichtung verlaufende Reihen von Anpresskolben hintereinander angeordnet sind.In press nips that require high accuracy, in particular long press nips, it is advantageous for forming a desired pressure profile in the web running direction if several, preferably two, rows of pressing pistons extending in the web running direction are arranged one behind the other.

Um wegen der elastischen, mittleren Schicht die Welligkeit des Liniendrucks zwischen den Anpresskolben zu begrenzen, sollte der Abstand zwischen den Mitten der Anpresskolben einer Reihe zwischen dem 1,5 und 2-fachem des Durchmessers der Anpresskolben liegen. Bei diesem Abstand ergibt sich eine relativ ebene Linienkraftverteilung.In order to limit the ripple of the line pressure between the Anpresskolben because of the elastic, middle layer, the distance between the centers of the Anpresskolben a row should be between 1.5 and 2 times the diameter of the Anpresskolben. At this distance results in a relatively flat line force distribution.

Zur Gewährleistung eines gewünschten Druckverlaufs auch an den Rändern sollte der Abstand des quer zur Bahnlaufrichtung liegenden Randes des Pressschuhs von der Mitte des äußersten Anpresskolbens zwischen dem 0,75 und dem 1-fachem des Durchmessers der Anpresskolben liegen.To ensure a desired pressure curve also at the edges of the distance of the transverse to the web running direction edge of the press shoe should be from the center of the outermost Anpresskolbens between 0.75 and 1 times the diameter of the Anpresskolben.

Nachfolgend soll die Erfindung an einem Ausführungsbeispiel näher erläutert werden. In der beigefügten Zeichnung zeigt:

Figur 1:
einen schematischen Querschnitt durch den Randbereich eines Pressschuhs 2 und
Figur 2:
eine schematische Draufsicht des Pressschuhs 2 mit Anpresskolben 6.
The invention will be explained in more detail with reference to an exemplary embodiment. In the attached drawing shows:
FIG. 1:
a schematic cross section through the edge region of a press shoe 2 and
FIG. 2:
a schematic plan view of the press shoe 2 with pressing piston. 6

Die in den Figuren gezeigte Presswalze hat einen flexiblen Walzenmantel 1 aus faserverstärktem Kunststoff, welcher von einem Pressschuh 2 zu einer zylindrischen Gegenwalze 9 gedrückt wird. Da der Pressschuh 2 eine, der Gegenwalze 9 zugewandte, konkave Pressfläche besitzt, kann sich der Walzenmantel 1 der Kontur der Gegenwalze 9 anpassen.The press roll shown in the figures has a flexible roll shell 1 made of fiber-reinforced plastic, which is pressed by a press shoe 2 to a cylindrical counter-roller 9. Since the press shoe 2 has a concave pressing surface facing the mating roll 9, the roll mantle 1 can adapt to the contour of the mating roll 9.

Dadurch kommt es zur Bildung eines verlängerten Pressspaltes, welcher wegen der verlängerten Verweilzeit der Faserstoffbahn im Pressspalt eine intensive, aber dennoch volumenschonende Behandlung der Faserstoffbahn erlaubt.This results in the formation of an extended press nip, which allows an intensive, yet volume-saving treatment of the fibrous web due to the extended residence time of the fibrous web in the press nip.

Während die Faserstoffbahn 1 zur Glättung allein durch den Pressspalt läuft, werden bei der Entwässerung der Faserstoffbahn ein oder mehrere Entwässerungsbänder vorzugsweise in Form von Pressfilzen zur Aufnahme des im Pressspalt ausgepressten Wassers durch diesen geführt.While the fibrous web 1 runs for smoothing solely through the press nip, in the dewatering of the fibrous web one or more dewatering belts are preferably guided in the form of press felts for receiving the water pressed out in the press nip.

Die Anpressung des Pressschuhs 2 erfolgt über zwei Reihen von axial nebeneinander angeordneten, hydraulischen Anpresskolben 6. Die in Bahnlaufrichtung 10, wie in Figur 2 gezeigt, hintereinander liegenden Reihen erlauben die Beeinflussung des Pressdruckverlaufs im Pressspalt in Bahnlaufrichtung 10.The pressing of the press shoe 2 via two rows of axially juxtaposed, hydraulic Anpresskolben 6. The web in the direction 10, as in FIG. 2 series shown one behind the other allow influencing of the pressing pressure curve in the press nip in the web running direction 10.

Um die Flexibilität des Pressschuhs 2 zu verbessern, besteht dieser aus drei Schichten 3,4,5, einer inneren Schicht 5 aus Stahl, einer kompressiblen, mittleren Schicht 4 aus einem kompressiblen Kunststoff und einer radial äußeren Schicht 3 ebenfalls aus Stahl.To improve the flexibility of the press shoe 2, this consists of three layers 3,4,5, an inner layer 5 made of steel, a compressible, middle layer 4 of a compressible plastic and a radially outer layer 3 also made of steel.

Die Stahl-Schichten 3,5 geben dem Pressschuh 2 die nötige Formstabilität und wirken einer zu starken Welligkeit des Liniendruckverlaufs im Pressspalt entgegen.The steel layers 3.5 give the press shoe 2 the necessary dimensional stability and counteract excessive ripple in the line pressure curve in the press nip.

Im Interesse einer ausreichenden Kompressibilität der mittleren Schicht hat der hierfür verwendete Kunststoff ein möglichst kleinen E-Modul zwischen 5 und 50 MPa und eine Querdehnzahl von weniger als 0,5.In the interests of sufficient compressibility of the middle layer of the plastic used for this purpose has the smallest possible modulus of elasticity between 5 and 50 MPa and a transverse strain of less than 0.5.

Damit die Schichten 3,4,5 ihre volle Wirkung erbringen, haben diese etwa die gleiche Dicke.For the layers 3,4,5 to have their full effect, these have about the same thickness.

Der Minimierung der Welligkeit des Liniendruckverlaufs quer zur Bahnlaufrichtung 10 ist der Abstand zwischen den Anpresskolben 6 einer Reihe möglichst klein. Bei der in Figur 1 gezeigten Ausführung haben die Mitten benachbarter Anpresskolben 2 einen Abstand 8 von etwas mehr als dem 1,5-fachen des Durchmessers der Anpresskolben 2.Minimizing the ripple of the line pressure curve across the web running direction 10, the distance between the pressing piston 6 a row is as small as possible. At the in FIG. 1 As shown, the centers of adjacent pressing pistons 2 have a distance 8 of slightly more than 1.5 times the diameter of the pressing pistons 2.

Um Randfehler zu minimieren beträgt der Abstand 7 zwischen der Mitte des äußersten Anpresskolbens 2 und dem Rand etwa das 0,75-fache des Durchmessers des Anpresskolbens 2.In order to minimize edge errors, the distance 7 between the center of the outermost pressing piston 2 and the edge is approximately 0.75 times the diameter of the pressing piston 2.

Claims (10)

  1. Press roll for calendering or dewatering a paper, board, tissue or other fibrous web in a machine for producing and/or finishing the same, having a flexible roll shell (1) which is pressed in the direction of a mating roll (9) by a press shoe (2) having a concave pressing surface in order to form a press nip, the press shoe (2) comprising three layers (3, 4, 5) lying one above another in the pressing direction, in particular being composed of three layers lying one above another in the pressing direction, of which the central layer (4) has an increased compressibility, characterized in that the central layer (4) has a modulus of elasticity between 5 and 50 MPa.
  2. Press roll according to Claim 1, characterized in that the layers (3, 4, 5) have a thickness which lies between 15 and 45%, preferably between 20 and 40%, of the thickness of the press shoe (2).
  3. Press roll according to Claim 1 or 2,
    characterized in that the layers (3, 4, 5) have approximately the same thickness.
  4. Press roll according to one of the preceding claims, characterized in that at least one layer (3, 5), preferably the outer (3) and in particular the outer (3) and the inner (5) layer, consist of steel.
  5. Press roll according to one of the preceding claims, characterized in that the compressible layer (4) consists of a compressible material, in particular plastic, preferably of a material with a transverse strain of less than 0.5.
  6. Press roll according to one of the preceding claims, characterized in that the compressible layer (4) has cut-outs, preferably grooves running in the web running direction (10).
  7. Press roll according to one of the preceding claims, characterized in that the press shoe (2) is pressed towards the mating roll (9) by at least one row of pressing elements, in particular pressure pistons (6), arranged axially beside one another.
  8. Press roll according to Claim 7, characterized in that a plurality of rows, preferably two rows, of pressure pistons (6) are arranged after one another in the web running direction (10).
  9. Press roll according to Claim 7 or 8,
    characterized in that the distance (8) between the centres of the pressure pistons (6) of a row lies between 1.5 and 2 times the diameter of the pressure pistons (6).
  10. Press roll according to one of Claims 7 to 9, characterized in that the distance (7) of the edge of the press shoe (2) lying transversely with respect to the web running direction (10) from the centre of the outermost pressure piston (6) lies between 0.75 and 1 times the diameter of the pressure pistons (6).
EP07122713A 2007-02-17 2007-12-10 Shoe press roll Not-in-force EP1959052B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL07122713T PL1959052T3 (en) 2007-02-17 2007-12-10 Shoe press roll

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007008037A DE102007008037A1 (en) 2007-02-17 2007-02-17 press roll

Publications (2)

Publication Number Publication Date
EP1959052A1 EP1959052A1 (en) 2008-08-20
EP1959052B1 true EP1959052B1 (en) 2009-09-16

Family

ID=39016266

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07122713A Not-in-force EP1959052B1 (en) 2007-02-17 2007-12-10 Shoe press roll

Country Status (5)

Country Link
EP (1) EP1959052B1 (en)
AT (1) ATE443178T1 (en)
DE (2) DE102007008037A1 (en)
ES (1) ES2333175T3 (en)
PL (1) PL1959052T3 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITFI20130106A1 (en) * 2013-05-09 2014-11-10 Toscotec S P A SHOE PRESS.
DE102019104389A1 (en) * 2019-02-21 2020-08-27 Voith Patent Gmbh Shoe press
IT202200006755A1 (en) 2022-04-06 2023-10-06 Guglielmo Biagiotti ROLLER FOR THE TREATMENT OF TAPE MATERIAL, PARTICULARLY FOR PAPER MATERIAL

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10233922A1 (en) 2002-07-25 2004-02-12 Voith Paper Patent Gmbh shoe press
DE102004026411A1 (en) * 2004-05-29 2005-12-22 Voith Paper Patent Gmbh Press roller for a web of paper or cardboard or tissue, to extract water and/or polish the surface, has a press shoe with a concave press surface and a decoupling zone to reduce the effects of heat on the press pressure profile

Also Published As

Publication number Publication date
EP1959052A1 (en) 2008-08-20
ATE443178T1 (en) 2009-10-15
PL1959052T3 (en) 2010-02-26
ES2333175T3 (en) 2010-02-17
DE102007008037A1 (en) 2008-08-21
DE502007001535D1 (en) 2009-10-29

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