EP1636417B1 - Bandkonstruktion - Google Patents

Bandkonstruktion Download PDF

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Publication number
EP1636417B1
EP1636417B1 EP04728363A EP04728363A EP1636417B1 EP 1636417 B1 EP1636417 B1 EP 1636417B1 EP 04728363 A EP04728363 A EP 04728363A EP 04728363 A EP04728363 A EP 04728363A EP 1636417 B1 EP1636417 B1 EP 1636417B1
Authority
EP
European Patent Office
Prior art keywords
belt
web
layer
metal layer
treated
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
Application number
EP04728363A
Other languages
English (en)
French (fr)
Other versions
EP1636417A1 (de
Inventor
Maria Lepola
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.)
Valmet Technologies Oy
Original Assignee
Metso Paper Oy
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Filing date
Publication date
Application filed by Metso Paper Oy filed Critical Metso Paper Oy
Publication of EP1636417A1 publication Critical patent/EP1636417A1/de
Application granted granted Critical
Publication of EP1636417B1 publication Critical patent/EP1636417B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D21F3/0227—Belts or sleeves therefor
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/0066—Calenders; Smoothing apparatus using a special calendering belt

Definitions

  • the present invention relates to a belt for a processing apparatus intended for treating a fiber web, said processing apparatus comprising a belt run adapted to travel around at least one guide element, outside said belt run being provided at least one counter-element creating a contact surface with the belt, such that between the belt and the counter-element is established a web processing zone, the web to be treated being passed therethrough.
  • the invention further relates to a method for processing or treating a fiber web.
  • US patent No. 6203307 discloses an elongated continuous belt that may be used in a hot soft nip calender.
  • the belt disclosed in that document may include a substrate formed from, for example, Kevlar (DuPont).
  • a smooth outer layer is provided on the surface of the bale that will contact the paper.
  • the smooth outer layer may comprise metallic materials.
  • EP-A-1314819 discloses a belt for use in a calender.
  • the belt disclosed in that document may comprise two layers of which one is a metal layer and the other layer that is heat insulating.
  • WO-A-02/29159 discloses a steel belt that has end sections made of a resilient material such as polymer, rubber or silicone.
  • a belt of the invention is characterized in that the belt comprises a layered structure, including a metallic outer layer, intended for contact with a fiber web to be treated, and at least one backing layer bonded to the metal layer's inner surface, the metal layer having a thickness in the range of about 0.1-0.3 mm.
  • a method of the invention is in turn characterized by what is set forth in the characterizing clause of claim 6.
  • Advantages gained by making a single- or multi-component backing layer flexible and/or compressible include e.g. the fact that pressure is transmitted evenly in the nip and vibration of the belt can be dampened, hence improving the stability and, consequently, runnability of the belt.
  • the layer-structured belt is also beneficial in terms of reducing noise caused by scuffing between belts and rolls.
  • a backing layer By using a backing layer, it is possible to make the metal layer thinner than when using a purely metallic belt, and this enables enhancing the process regarding the use of a heated metal belt as heat Is able to transfer rapidly from the belt to a presently processed web which has its surface portion converting to a plastic state and then cooling rapidly, the polymers contained in the web converting from a plastic state to a glassy state and the conversion remaining permanent. Heating of the belt's metal layer and a rapid transfer of heat therefrom to the web can be enhanced by making the backing layer from a heat insulating or poorly conducting material. In this case, the heat transfers from the metal layer only towards the web and simultaneously the metal layer cools quickly.
  • a thinner metal belt improves bending strength, whereby the diameter of guide rolls can be reduced.
  • the currently employed thickness Is typically 0,6 mm
  • the thickness of a metal layer can be less than about 0,3 mm, and preferably it can be less than about 0,1 mm.
  • Fig. 1 shows one processing apparatus applying a belt solution of the invention and designed as a belt calender, comprising a calendering belt 2 which travels around guide rolls 3, at least some of said guide rolls being displaceable for adjusting the belt's 2 tightness and/or the processing zone length as desired.
  • the calendering belt 2 travels around a roll 5 disposed on its outside, establishing a calendering zone between the belt 2 and the roll 5.
  • a material web W to be calendered passes through the calendering zone, being thus exposed to a desired pressure impulse and heat effect as a function of time. Depicted with a dash-and-dot line 9 in fig.
  • a dash line 8 depicts the shape of a pressure effect whenever the contact pressure existing in the calendering zone is established solely by means of the belt's 2 tightness as the nip roll 4 is out of contact with the belt 2 (or when there is no nip roll 4 installed inside the belt 2).
  • the roll 5, and likewise the nip roll 4 may or may not be a deflection-compensated roll and can be selected from a group consisting of: a flexible surface roll, such as a polymer-coated roll, a rubber-coated roll or an elastomer-surface roll, a shoe roll, a thermal roll, a metal roll, a fiber roll, and a composite roll.
  • the press element may comprise some other profilable or fixed-profile press element, which may further consist of several elements successive in a cross-machine direction.
  • the roll-shaped press element 4 may also consist of several elements successive in a cross-machine direction.
  • the press element 4 may have a surface which is designed to be continuous or discontinuous.
  • the press element 4 can also be adapted to be displaceable for varying the processing zone length and/or the belt's tightness.
  • the belt 2 comprises a metallic outer layer 10, intended for contact with a presently treated fiber web W, and a backing layer 11 bonded to the metal layer's inner surface and preferably selected from a group consisting of: rubber, polyurethane, a composite material, felt, aramid (e.g. kevlar®), or combinations thereof.
  • a higher pressure zone established by the nip roll 4 can be widened as compared to what is achieved with a substantially non-compressible belt.
  • the backing layer dampens vibrations and thus improves the belt's controllability.
  • Fig. 3 shows a second exemplary embodiment of the belt 2, in which to the backing layer's 11 inner surface is bonded a second metal-belt layer 12, which is preferably thicker than the outer surface layer 10.
  • the outer surface layer 10 has a thickness which is preferably within the range of about 0,1-0,3 mm and the Inner metal layer 12 can be within the range of about 0,3-1 mm.
  • the backing layer 11 is preferably within the range of about 3-10 mm.
  • the nip roll 4 comprises a deflection-compensated roll.
  • Reference numeral 6 represents heating elements, such as for example an induction heater, an infrared radiator, a gas burner, or a capacitive heater.
  • the inventive belt solution can be provided with elevated temperatures, for example from higher than about 100°C to higher than about 200°C and even to as high as 400°C, depending on a particular application.

Landscapes

  • Treatment Of Fiber Materials (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Claims (6)

  1. Band für ein Prozessgerät, das zum Behandeln einer Faserbahn bestimmt ist, wobei das Prozessgerät einen Bandlauf (2) aufweist, der daran angepasst ist, dass er um zumindest ein Führungselement (3) läuft, wobei zumindest ein Gegenelement (5) außerhalb des Bandlaufes so vorgesehen ist, dass es eine Kontaktfläche mit dem Band derart erzeugt, dass zwischen dem Band (2) und dem Gegenelement (5) eine Bahnprozesszone (N) errichtet wird, wobei die zu behandelnde Bahn durch diese hindurch tritt, wobei das Band des Bandlaufs einen in Lagen gebildeten Aufbau aufweist, der eine metallene Außenlage (10), die für einen Kontakt mit einer zu behandelnden Faserbahn (W) bestimmt ist, und zumindest eine Stützlage (11) aufweist, die mit der Innenfläche der metallenen Lage verbunden ist und aus einem flexiblen und / oder komprimierbaren Material hergestellt ist,
    dadurch gekennzeichnet, dass
    die Dicke der äußersten metallenen Lage (10) innerhalb des Bereiches von ungefähr 0,1 bis 0,3 mm liegt.
  2. Band gemäß Anspruch 1,
    dadurch gekennzeichnet, dass
    zwei oder mehr Stützlagen vorhanden sind, die miteinander und mit der Innenfläche der metallenen Lage (10) zum Zwecke eines einstückigen Bandaufbaus verbunden sind.
  3. Band gemäß Anspruch 1 oder 2,
    dadurch gekennzeichnet, dass
    mit der Innenfläche der inneren Stützlage eine zweite metallene Lage (12) verbunden ist.
  4. Band gemäß einem der Ansprüche 1 bis 3,
    dadurch gekennzeichnet, dass
    die Stützlage (11) aus einem Wärmeisolationsmaterial besteht.
  5. Band gemäß einem der vorherigen Ansprüche,
    dadurch gekennzeichnet, dass
    die Stützlage / Stützlagen (11) aus der folgenden Gruppe gewählt wird / werden: Gummi, Polyurethan, ein Verbundmaterial, Filz, Aramid oder Kombinationen aus ihnen.
  6. Verfahren zum Behandeln einer Faserbahn mit einem Prozessgerät, das einen Bandlauf (2) aufweist, der daran angepasst ist, dass er um zumindest ein Führungselement (3) läuft, wobei außerhalb des Bandlaufs zumindest ein Gegenelement (5) vorgesehen ist, das eine Kontaktfläche mit dem Band derart erzeugt, dass zwischen dem Band (2) und dem Gegenelement (5) eine Bahnbehandlungszone (N) errichtet ist, wobei die zu behandelnde Bahn durch diese hindurch tritt, wobei dass Verfahren das Verwenden eines in Lagen aufgebauten Bandes in dem Bandlauf aufweist, der eine metallene relativ dünne Außenlage (10), die für einen Kontakt mit einer zu behandelnden Faserbahn (W) bestimmt ist, und zumindest eine Stützlage (11) aus einem flexiblen und / oder komprimierbaren Material, die mit der Innenfläche der metallenen Lage verbunden ist, aufweist, wobei das Verfahren des weiteren ein Erwärmen der metallenen relativ dünnen Außenlage für eine schnelle Übertragung von Wärme zu der gegenwärtig behandelten Bahn aufweist, wobei ihr Oberflächenabschnitt in einen plastischen Zustand übergeht und dann schnell abkühlt, wodurch die in der Bahn enthaltenen Polymere von einem plastischen Zustand in einen glasigen Zustand übergehen und der Übergang dauerhaft bleibt,
    dadurch gekennzeichnet, dass
    die Dicke der äußersten metallenen Lage (10) innerhalb des Bereiches von ungefähr 0,1 mm bis 0,3 mm liegt.
EP04728363A 2003-05-30 2004-04-20 Bandkonstruktion Expired - Lifetime EP1636417B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20030815A FI113881B (fi) 2003-05-30 2003-05-30 Hihnarakenne
PCT/FI2004/050042 WO2004106628A1 (en) 2003-05-30 2004-04-20 Belt structure

Publications (2)

Publication Number Publication Date
EP1636417A1 EP1636417A1 (de) 2006-03-22
EP1636417B1 true EP1636417B1 (de) 2007-11-28

Family

ID=8566185

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04728363A Expired - Lifetime EP1636417B1 (de) 2003-05-30 2004-04-20 Bandkonstruktion

Country Status (4)

Country Link
EP (1) EP1636417B1 (de)
AT (1) AT502000B1 (de)
FI (1) FI113881B (de)
WO (1) WO2004106628A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008024082A1 (de) 2008-05-17 2009-11-19 Andritz Küsters Gmbh Kalander
DE102009045480A1 (de) * 2009-10-08 2011-04-14 Voith Patent Gmbh Pressbandentwässerung
EP2546412B1 (de) 2011-07-15 2015-01-21 Valmet Technologies, Inc. Vorrichtung und Verfahren zum Beheizen von mindestens einem Element einer Verarbeitungsvorrichtung in einem Pressen-, Trocknungs- und/oder Veredlungsabschnitt einer Maschine zur Behandlung einer Faserstoffbahn

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6007921A (en) * 1992-10-09 1999-12-28 Champion International Corporation Continuous finishing belt capable of finishing surface of a web of paper
US5400707A (en) * 1992-10-09 1995-03-28 Champion International Corporation Apparatus for finishing a continuous sheet of paper
US6203307B1 (en) * 1997-08-28 2001-03-20 Champion International Corporation System for finishing surface of a web of paper having an improved continuous finishing belt
AU2001289975A1 (en) * 2000-10-02 2002-04-15 Metso Paper Inc. Method and arrangement for calendering a web comprising a long-nip calender
DE10157687B4 (de) * 2001-11-24 2005-11-17 Voith Paper Patent Gmbh Kalander und Verfahren zum Glätten einer Papier- oder Kartonbahn

Also Published As

Publication number Publication date
AT502000A1 (de) 2006-12-15
AT502000B1 (de) 2007-08-15
EP1636417A1 (de) 2006-03-22
FI20030815A0 (fi) 2003-05-30
WO2004106628A1 (en) 2004-12-09
FI113881B (fi) 2004-06-30

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