EP2123825A1 - Procédé d'ouverture d'un interstice de pressage prolongé - Google Patents
Procédé d'ouverture d'un interstice de pressage prolongé Download PDFInfo
- Publication number
- EP2123825A1 EP2123825A1 EP09004426A EP09004426A EP2123825A1 EP 2123825 A1 EP2123825 A1 EP 2123825A1 EP 09004426 A EP09004426 A EP 09004426A EP 09004426 A EP09004426 A EP 09004426A EP 2123825 A1 EP2123825 A1 EP 2123825A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- roll
- lubricant
- roll shell
- shoe
- extended nip
- 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.)
- Granted
Links
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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 according to the preamble of claim 1.
- 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 the contact pressure against 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 according to the preamble of claim 1, 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.
- the cause of the troubled run of the roll shell when opening the long nip is that the sump forming in front of the pressure shoe during operation of a shoe roll virtually slips as a unit between the shoe and the roll shell instead of being distributed evenly.
- the sumping is therefore required for the operating conditions of the shoe roll.
- 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)
- Valve Device For Special Equipments (AREA)
- Massaging Devices (AREA)
- High-Pressure Fuel Injection Pump Control (AREA)
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 true EP2123825A1 (fr) | 2009-11-25 |
EP2123825B1 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) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITFI20130106A1 (it) * | 2013-05-09 | 2014-11-10 | Toscotec S P A | Pressa a scarpa. |
Citations (3)
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 |
DE202005019693U1 (de) | 2005-12-12 | 2006-02-23 | Eduard Küsters Maschinenfabrik GmbH & Co. KG | Schuhwalze |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
DE102006021428A1 (de) | 2006-05-05 | 2007-11-08 | Andritz Küsters GmbH & Co. KG | Vorrichtung zum Bilden mindestens eines Langspalts |
-
2008
- 2008-05-24 DE DE102008025042A patent/DE102008025042A1/de not_active Withdrawn
-
2009
- 2009-03-27 EP EP09004426A patent/EP2123825B1/fr not_active Expired - Fee Related
- 2009-03-27 DE DE502009000161T patent/DE502009000161D1/de active Active
- 2009-03-27 AT AT09004426T patent/ATE487825T1/de active
Patent Citations (3)
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 |
DE202005019693U1 (de) | 2005-12-12 | 2006-02-23 | Eduard Küsters Maschinenfabrik GmbH & Co. KG | Schuhwalze |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITFI20130106A1 (it) * | 2013-05-09 | 2014-11-10 | Toscotec S P A | Pressa a scarpa. |
WO2014181366A1 (fr) | 2013-05-09 | 2014-11-13 | Toscotec S.P.A. | Presse à patin |
CN105189864A (zh) * | 2013-05-09 | 2015-12-23 | 托斯克科技股份公司 | 靴型压榨机 |
US9885150B2 (en) | 2013-05-09 | 2018-02-06 | Toscotec S.P.A. | Shoe press |
Also Published As
Publication number | Publication date |
---|---|
DE502009000161D1 (de) | 2010-12-23 |
ATE487825T1 (de) | 2010-11-15 |
EP2123825B1 (fr) | 2010-11-10 |
DE102008025042A1 (de) | 2009-11-26 |
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