EP2123825B1 - Procédé d'ouverture d'un interstice de pressage prolongé - Google Patents

Procédé d'ouverture d'un interstice de pressage prolongé Download PDF

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Publication number
EP2123825B1
EP2123825B1 EP09004426A EP09004426A EP2123825B1 EP 2123825 B1 EP2123825 B1 EP 2123825B1 EP 09004426 A EP09004426 A EP 09004426A EP 09004426 A EP09004426 A EP 09004426A EP 2123825 B1 EP2123825 B1 EP 2123825B1
Authority
EP
European Patent Office
Prior art keywords
lubricant
roll shell
roll
extended nip
shoe
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 - Fee Related
Application number
EP09004426A
Other languages
German (de)
English (en)
Other versions
EP2123825A1 (fr
Inventor
Robert Meitner
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.)
Andritz Kuesters GmbH
Original Assignee
Andritz Kuesters 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 Andritz Kuesters GmbH filed Critical Andritz Kuesters GmbH
Publication of EP2123825A1 publication Critical patent/EP2123825A1/fr
Application granted granted Critical
Publication of EP2123825B1 publication Critical patent/EP2123825B1/fr
Expired - Fee Related 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 method for opening an extended nip.
  • a press device which comprises a fixed support member, which rotates about an annular member as a roll shell.
  • a hydraulically actuated support member is arranged, which operates on the principle of a hydrodynamic or hydrostatic sliding shoe.
  • a certain amount of lubricant is introduced, which is applied to the inner surface due to the centrifugal force when circulating the roll shell. This amount of lubricant is taken from the annular roll shell during circulation and enters the gap between the inner surface of the roll shell and the running surface of the hydraulically actuated support element during contact with the inner surface.
  • a shoe roll for forming an extended nip with a counter roll for treating a material web.
  • a flexible roll shell is rotatable, which is closable on the edge and is supported in the extended nip on a lubricated running surface of a pressure shoe arranged on the carrier.
  • a means for applying lubricant to the inside of the roll shell is provided for the lubrication of the tread.
  • the applied to the inside of the roll shell oil is taken from the roll shell during circulation and enters the extended nip on the tread of the pressure shoe.
  • the lubricant applied to the inside of the roll mantle can be stripped off again behind the extended nip.
  • suction lines By applying lubricant, an excess amount of oil within the roll shell can accumulate under gravity in a sump.
  • a suction line By means of a suction line, a sump is also pumped out here.
  • a disadvantage of such suction lines is that they should be arranged as possible at the lowest point of the roll mantle. However, this presents difficulties when the roll mantle, due to its flexibility, has deformations in which a sump is immersed. This leads to a troubled run of the roll shell. This is especially true when opening the Langnips at high rotational speeds of the flexible roll shell.
  • the object of the invention is therefore to provide a method for opening an extended nip between a counter element and a shoe roll with a flexible roll shell, which allows smooth running of the roll shell at high speeds.
  • a method for opening an extended nip in which an oil sump is broken down in front of the pressure shoe before the Langnip is opened.
  • the degradation of the oil sump during a period prior to opening the long nip ensures lubrication of the tread until it opens, but by reducing or adjusting the application of lubricant, the oil sump is consumed. A suction or drainage of the oil sump is not required.
  • the reverse approach is used to change the application of lubricant to the inside of the roll shell before the extended nip is opened by means of an inflow regulation.
  • a means for applying lubricant is turned off 0.5 to 4 seconds earlier than the elongated nip is opened.
  • the lubricant especially oil, is then consumed before the long nip is opened becomes.
  • the speed of rotation of the roll shell does not have to be reduced.
  • a possibly provided additional lubrication on the press shoe itself can provide a minimum lubrication, so that a dry running of the tread of the pressure shoe is excluded.
  • the means for applying lubricant may be switched on 0.5 to 4 seconds before and wet the inside of the roll shell and the tread of the press shoe sufficiently with lubricant before the Langnip is closed.
  • the inflow regulation is controlled before the opening of the long nip as a function of the rotational speed of the roll mantle.
  • the time period can then be set short to improve a quick opening of the long nip.
  • the inflow control reduces the feed rate as a function of speed to preferably less than 30% of the feed rate in the operating state of the device.
  • Fig. 1 schematically shows an apparatus for forming at least one extended nip N between a shoe roll 1 and a counter-element 2 for treating a Material web M, in particular a paper, board or tissue web, in a machine for producing and / or finishing the material web.
  • the counter element 2 is preferably a counter-roller or a cylinder.
  • the material web M with or without belt 21 or belts, such as felts or screens, is transported through the long nip N.
  • the shoe roll 1 has a fixed support 3, around which a rotatable flexible roll shell 4 is arranged.
  • the roll shell 4 is formed tubular and with its ends to rotatably seated on the support 3 edge discs (not shown) attached to form a closed shoe roll 1.
  • At least one hydraulically actuated pressure shoe 5 is arranged on the carrier 3.
  • the pressure shoe 5 has a tread 6.
  • the roll shell 4 is in Langnip N on the tread 6, with the same lubrication, supported.
  • the pressure shoe 5 can be pressed against the counter element 2 via a hydraulic element 7, which is fastened to the carrier 3 as a cylinder / piston unit.
  • a number of hydraulic elements 7 is arranged distributed over the length of the pressure shoe 5.
  • the respective hydraulic element 7 presses the pressure shoe 5 via a cylinder / piston unit which has at least one, preferably two cylinder / piston element (s) 10 arranged next to one another.
  • a pressure oil through inlet / outlet lines 9 can be introduced via a pressure chamber 8 in order to press the pressure shoe 5 against the counter element 2.
  • a second pressure chamber 22 is provided, which can be acted upon via supply lines 11.
  • the hydraulic element 7 can store the pressure shoe 5 on a sealing gap, as is known from DE 10 2006 021 428 A1 ,
  • the pressure shoe 5 may further be provided with at least one additional lubrication 13, which supplies the running surface 6 of the pressure shoe 5 with a minimum amount of lubricant for a preferably hydrostatic lubrication.
  • a device 15 for applying lubricant to the inner side 14 of the roll mantle 4 is provided.
  • This device 15 is for example a spray tube for oil as a lubricant.
  • the applied by the device 15 on the inside 14 of the roll shell 4 lubricant is taken from the roll shell 4 during circulation and passes into the extended nip N on the tread 6 of the pressure shoe 5. Since an excess amount of lubricant is applied to the inner surface 14 of the roll shell 4 In order to ensure the function of lubricating the operation of the shoe roll, during circulation, a certain amount of lubricant accumulates in the direction of circulation before the pressure shoe 5 as a sump 16. This under centrifugal in the sump accumulating amount of lubricant can partially drip into a collecting area 17, of where a derivative takes place.
  • the sump formation is additionally effected by gravity.
  • this sump 16 slips quasi as a unit between the pressure shoe 5 and roll shell 4 through, instead of being distributed.
  • the slippage of the sump 16 is made possible by the fact that the Nip réelle in the extended nip N is missing due to the opening, whereby a gap between the roll shell 4 and pressure shoe 5 is formed.
  • the roll shell 4 no longer follows the running surface 6 of the pressure shoe 5. This is generally independent of whether the pressure shoe 5 has a concave, convex or substantially planar shaped running surface 6. Also in the case of the use of a belt 21 or bands was inventively found that the outer band pressure is not sufficient to prevent slippage of the sump 16.
  • the following is provided according to the invention for opening the long nip N at preferably higher speeds.
  • the extended nip N is provided between a counter element 2 and a shoe roll 1 for treating a material web M, in particular a paper, board or tissue web, in a machine for producing and / or finishing the same, wherein the shoe roll 1 has a flexible roll shell 4, the edge side closable and is supported in the extended nip N on a lubricated running surface 6 of a pressure shoe 5 of the shoe roll 1, while the pressure shoe 5 is pressed to the counter element 2, for which purpose lubricant is applied to the inside 14 of the roll shell 4.
  • the period of time during which the lubricant application can be varied, for example, to zero, depending on the rotational speed of the roll shell 4, preferably 0.5 to 4 s.
  • the inflow control is controlled prior to the opening of the long nip N as a function of the rotational speed of the roll mantle.
  • the time period can then be set as short as possible.
  • the inflow control reduces the feed rate as a function of speed to preferably less than 30% of the feed rate in the operating state of the device.
  • the inflow regulation can be time-dependent, in which the period of time is determined.
  • Changing the application of lubricant to the inner side 14 of the rotating roll shell 4 is preferably carried out by means of a controller 19, to which the means 15 for applying lubricant is connected, as in Fig. 3 shown.
  • the material web M is preferably dewatered or smoothed in Langnip N.
  • the long nip N is preferably formed in a wet press or a calender.
  • the extended nip N is preferably opened at speeds of the roll shell 4 greater than 800 m / min.
  • the shoe roll 1 may have its own drive or be towed over a belt 21.
  • a position determination of the counter element 2 is made in order to control the application of lubricant to the inside 14 of the roll shell 4 before opening the extended nip.
  • To the control device 19 then preferably in addition to the means 15 for applying lubricant and a position indicator 20 is connected.

Landscapes

  • Paper (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Massaging Devices (AREA)
  • High-Pressure Fuel Injection Pump Control (AREA)
  • Valve Device For Special Equipments (AREA)

Claims (9)

  1. Procédé d'ouverture d'un interstice de pressage prolongé entre un contre-élément et un rouleau support (1) pour le traitement d'une bande de matériau (M), en particulier une bande de papier, de carton ou de tissu dans une machine pour leur production ou leur raffinage, le rouleau support (1) possédant une gaine (4) flexible rotative pouvant être fermée au niveau de ses extrémités, et qui s'appuie sur une surface de roulement (6) lubrifiée d'un sabot de compression (5) du rouleau support (1) au niveau de l'interstice de pressage prolongé alors que le sabot de compression (5) est pressé envers le contre-élément (2), pour lequel des moyens de lubrification sont appliqués sur la face interne de la gaine (4), les moyens de lubrification étant appliqués sur la face interne de la gaine (4) de telle sorte qu'une certaine quantité de moyens de lubrification s'accumule dans le sens de rotation de la gaine (4) au devant du sabot de compression (5) en tant que bassin de dégorgement de moyens de lubrification (16) lors de la rotation de la gaine (4), l'application de moyens de lubrification sur la face interne (14) de la gaine (4) en rotation étant restreinte, lors d'un intervalle de temps avant l'ouverture de l'interstice de pressage prolongé (N), de telle sorte que plus de moyens de lubrification ne sont consommés qu'appliqués pour la lubrification de la surface de roulement (6) du sabot de compression (5), et qu'ainsi le bassin de dégorgement de moyens de lubrification (16) est réduit avant l'ouverture de l'interstice de pressage prolongé (N).
  2. Procédé selon la revendication 1, caractérisé en ce que l'application de moyens de lubrification sur la face interne (14) de la gaine (4) en rotation est désactivée avant l'ouverture de l'interstice de pressage prolongé (N).
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce qu'une régulation du flux d'approvisionnement en moyens de lubrification est effectuée, lors de l'intervalle de temps, en fonction de la vitesse de rotation de la gaine (4).
  4. Procédé selon la revendication 3, caractérisé en ce que l'intervalle de temps dépendant de la vitesse de rotation de la gaine (4) est compris entre 0.5 et 4 secondes.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que l'intervalle de temps de régulation du flux d'approvisionnement en moyens de lubrification est choisi en fonction de la vitesse de rotation de la gaine (4).
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que la bande de matériau (M) est asséchée ou glacée le long de l'interstice de pressage prolongé (N).
  7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce que l'interstice de pressage prolongé (N) est ouvert lors de vitesses de gaines (4) supérieures à 800 mètres par minute.
  8. Procédé selon l'une des revendications 1 à 7, caractérisé en ce qu'on réalise une détermination de la position du contre-élément (2) pour commander l'application d'huile de lubrification sur la face interne (14) de la gaine (4) avant l'ouverture de l'interstice de pressage prolongé (N).
  9. Procédé selon l'une des revendications 1 à 8, caractérisé en ce que le contre-élément (2) est formé par un contre-rouleau ou un cylindre.
EP09004426A 2008-05-24 2009-03-27 Procédé d'ouverture d'un interstice de pressage prolongé Expired - Fee Related EP2123825B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008025042A DE102008025042A1 (de) 2008-05-24 2008-05-24 Verfahren zum Öffnen eines Langspalts

Publications (2)

Publication Number Publication Date
EP2123825A1 EP2123825A1 (fr) 2009-11-25
EP2123825B1 true EP2123825B1 (fr) 2010-11-10

Family

ID=40568676

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09004426A Expired - Fee Related EP2123825B1 (fr) 2008-05-24 2009-03-27 Procédé d'ouverture d'un interstice de pressage prolongé

Country Status (3)

Country Link
EP (1) EP2123825B1 (fr)
AT (1) ATE487825T1 (fr)
DE (2) DE102008025042A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITFI20130106A1 (it) * 2013-05-09 2014-11-10 Toscotec S P A Pressa a scarpa.

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3602565A1 (de) * 1985-02-01 1986-10-09 J.M. Voith Gmbh, 7920 Heidenheim Walzenpresse mit einer langspalt-presswalze
DE4402754A1 (de) 1994-01-31 1994-06-16 Voith Gmbh J M Preßelement
DE19613392C1 (de) * 1996-04-03 1997-07-24 Voith Sulzer Papiermasch Gmbh Preßvorrichtung
DE10259232A1 (de) * 2002-12-17 2004-07-15 Eduard Küsters Maschinenfabrik GmbH & Co. KG Vorrichtung zum Bilden eines Langspalts
DE202005019693U1 (de) 2005-12-12 2006-02-23 Eduard Küsters Maschinenfabrik GmbH & Co. KG Schuhwalze
DE102006021428A1 (de) 2006-05-05 2007-11-08 Andritz Küsters GmbH & Co. KG Vorrichtung zum Bilden mindestens eines Langspalts

Also Published As

Publication number Publication date
DE102008025042A1 (de) 2009-11-26
EP2123825A1 (fr) 2009-11-25
DE502009000161D1 (de) 2010-12-23
ATE487825T1 (de) 2010-11-15

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