EP0823507A2 - Dispositif de pressage - Google Patents

Dispositif de pressage Download PDF

Info

Publication number
EP0823507A2
EP0823507A2 EP97111129A EP97111129A EP0823507A2 EP 0823507 A2 EP0823507 A2 EP 0823507A2 EP 97111129 A EP97111129 A EP 97111129A EP 97111129 A EP97111129 A EP 97111129A EP 0823507 A2 EP0823507 A2 EP 0823507A2
Authority
EP
European Patent Office
Prior art keywords
press
fibrous web
control
felt
regulating device
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.)
Ceased
Application number
EP97111129A
Other languages
German (de)
English (en)
Other versions
EP0823507A3 (fr
Inventor
Wolfgang Schuwerk
Joachim Dr. Grabscheid
Rudolf Hasenfuss
Christian Schiel
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 Sulzer Papiermaschinen GmbH
Voith Sulzer Papiertechnik 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 Sulzer Papiermaschinen GmbH, Voith Sulzer Papiertechnik Patent GmbH filed Critical Voith Sulzer Papiermaschinen GmbH
Publication of EP0823507A2 publication Critical patent/EP0823507A2/fr
Publication of EP0823507A3 publication Critical patent/EP0823507A3/fr
Ceased 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

Definitions

  • the invention relates to a press arrangement of a paper or Cardboard machine for the treatment of a fibrous web in an extended press nip in the running direction of the fibrous web, which is provided between two press surfaces of which at least one through a flexible, at least a press shoe guided press jacket is formed by the press shoe with the formation of a fluid cushion between Press shoe and press jacket against the opposite pressing surface is pressable, the press shoe being acted upon in this way is that in particular at least essentially constant average total load of the Press shoe the resulting center of gravity relative to Press shoe adjustable in the running direction of the fibrous web so that it is in the direction of the fibrous web in the press nip setting pressure profile can be influenced accordingly, and together with the fibrous web to be treated led at least one drainage felt through the press nip becomes.
  • the pressure profile in the press nip can now can also be influenced by felt properties, for example the felt elasticity, the felt thickness, the felt contamination, the water and / or air permeability of the relevant drainage felt in the x, y and z directions given nonwoven resistance of the felt and / or inner Count the structures and layers of the felt. It can also the pressure profile also be dependent on influencing factors that cannot be assigned directly to the felt. Which includes for example the operating speed, the water supply through the fibrous web, the filler content of the Press water and the thickness cross profile of the fibrous web, which is in particular a paper or cardboard web can act. These influencing factors and their impact can different from felt to felt as well as from production to production be and especially in the course of life change the felt.
  • the aim of the invention is to provide a press arrangement at the beginning to create the type mentioned, despite the large number different, in particular to changing felt properties, a changing behavior of the felt and / or similar declining interference on simple and reliable way always ensures optimal operation is.
  • At least one device for control and / or regulation of the pressure profile is provided, through which the respective Location of the relative to the press shoe in the running direction of the fibrous web adjustable center of gravity depending of at least one input variable that can be set for the nature and / or behavior of the drainage felt is representative during operation so that the relative position of the center of gravity in itself during operation and over the life of the drainage felt resulting changes in the nature or behavior this drainage felt is adjustable accordingly is.
  • Press arrangement are the control and / or Control device Means for direct or indirect measurement of the resultant after passing through the press nip assigned average dry content of the fibrous web, a corresponding to the control and / or regulating device Deliver input variable.
  • the tax and / or Control device can then be designed so that the Setting the position of the center of gravity relative to Press shoe always with a view to achieving one if possible high dry content of the fibrous web takes place.
  • Measured values obtained for the dry content will.
  • the in terms of maximum dryness the fibrous web is the optimal location of the center of gravity guaranteed regardless of any interference, after this in particular through a corresponding Adjustment of the center of gravity compensated accordingly will.
  • control and / or regulating device also means for measuring the dry matter content at least one together with the fibrous web to be treated assigned through the press nip drainage felt be to the control and / or regulating device to supply a corresponding input variable.
  • the means for measuring the dry matter content of at least one Drainage felt in particular for indirect measurement of the Dry content of the fibrous web may be provided to the Control and / or regulating device one for the dry content representative size of the fibrous web deliver.
  • the relevant input variable is used or the corresponding measured value thus as an indicator for the primarily dry matter of interest to be treated Fibrous web.
  • Control and / or regulating device means for measuring the Vacuum in at least one of the felt cleaning Pipe suction device for at least one together with the fibrous web assigned through the press nip drainage felt, a corresponding to the control and / or regulating device Deliver input variable.
  • the control and / or regulating device can advantageously also assigned means for measuring the felt thickness be a corresponding to the control and / or regulating device Deliver input variable. This is the felt thickness preferably under the current operating conditions measured so that the relevant control and / or regulating device input variable representative of this is current operating conditions.
  • Means for determining are preferably used to measure the felt thickness the distance between the press shoe and the opposite pressing surface provided. This distance can be determined using known suitable measuring methods. So this determination of the distance between the press shoe and the opposite pressing surface in a known manner Way, for example using an echo sounder, using a inductive distance measurement and / or the like.
  • the center of gravity is preferred depending on the mean of the measured values of the different Measurements adjustable, correspondingly a similar one Adjustment of the center of gravity across the width of the Press arrangement takes place.
  • the measured values of the different can also be made individually for zonal adjustment the center of gravity across the width of the press assembly be used.
  • the press arrangement according to the invention comprises the Control and / or regulating device at least one control loop for one in terms of achieving one if possible high dry content of the fibrous web takes place fully automatic Optimization of the particular by an appropriate Press shoe load effectable adjustment of the respective Position of the center of gravity relative to the press shoe.
  • a paper or board machine belonging press assembly 10 is used for treatment a fibrous web 12, here a paper or cardboard web, extended in a direction L of the fibrous web 12 Press nip 14.
  • the press nip 14 is the lower limit Press surface by at least one press shoe 16 guided flexible press jacket 18 a lower press roll 20 formed.
  • this is to form the upper one Press surface a cylindrical counter roll 22 arranged in the present embodiment, a rigid roller shell owns.
  • Basically, however, can also on this Side of the press nip 14 a via at least one press shoe or the like guided flexible press jacket provided be.
  • the flexible press jacket 18 of the lower press roll 20 is through the press shoe 16 to form a fluid cushion between press shoe 16 and press jacket 18 against the opposite, pressing surface formed by the counter roll 22 can be pressed.
  • the press shoe 16 is by means of a plurality of each formed by a cylinder / piston unit 24 Hydraulic elements can be pressed against the counter roller 22 are supported on an underlying stationary support 26, around which the flexible press jacket 18 rotates.
  • the press shoe 16 can be acted upon such that, in particular even with an at least substantially constant average total load of the press shoe 16 resulting center of gravity relative to the press shoe 16 in Running direction L of the Fasterstoffbahn 12 adjustable and thus that in the running direction L of the fibrous web 12 in the press nip 14 adjustable pressure profile can be influenced accordingly is.
  • the press arrangement 10 further comprises a device 30 for controlling and / or regulating the pressure profile, by means of which the respective position of the center of gravity, which is adjustable relative to the press shoe 16 in the running direction L of the fibrous web 12, can be set as a function of at least one input variable E i .
  • At least one such input variable E i is representative of the nature and / or the behavior of the drainage felt 28 during operation, so that in particular as a function of at least one corresponding output signal S of the control and / or regulating device 30 and in particular due to a corresponding load on the press shoe 16, the relative position of the center of gravity in the event of changes in the nature or behavior of this drainage felt 28 during operation and in the course of the service life of the drainage felt 28 is correspondingly adjustable.
  • control and / or regulating device 30 is assigned means 32 for direct or indirect measurement of the average dry content of the fibrous web 12 which results after a passage through the press nip 14, and the control and / or regulating device 30 has a corresponding input variable E i deliver.
  • the control and / or regulating device 30 is designed such that the position of the center of gravity relative to the press shoe 16 is always adjusted with a view to achieving the highest possible dry content of the fibrous web 12.
  • control and / or regulating device 30 also means for measuring the dry content the together with the fibrous web 12 to be treated assigned through the press nip 14 drainage felt 28 be. These means for measuring the dry matter content of the drainage felt 28 can thus, in particular, for indirect Measurement of the dry content of the water to be drained Serve fibrous web 12. The relevant one, the tax and / or Control device 30 input variable can then be used as an indicator of the dryness of the treated Fiber web 12 are taken into account.
  • control and / or regulating device 30 can also be assigned, for example, means for measuring the negative pressure in a pipe suction device used for cleaning the dewatering felt 28 in order to supply this control and / or regulating device 30 with a corresponding input variable E i .
  • means for measuring the felt thickness can also be provided. This is then preferably measured under the current operating conditions in order to provide the control and / or regulating device 30 with a corresponding input variable which is representative of the current operating state.
  • means for determining the distance between the press shoe 16 and the opposite press surface formed by the counter-roller 22 can be provided.
  • the distance between the press shoe 16 and the opposing press surface can be determined in a manner known per se by means of an echo sounder, by means of an inductive distance measurement and / or the like.
  • measurements are preferably carried out at a plurality of positions over the width of the press arrangement 10 which extends transversely to the running direction of the fibrous web 12.
  • the center of gravity can be adjustable as a function of the mean value of the measured values of the various measurements, and the force center of gravity can be adjusted accordingly over the width of the press arrangement 10.
  • the measured values of the various measurements can also be used individually for zonal adjustment of the center of gravity across the width of the press arrangement.
  • control and / or regulating device 30 comprises at least one control loop for one with a view to achieving the highest possible dry content of the fibrous web 12 fully automatic optimization of the particular can be brought about by a corresponding pressure shoe load Setting the respective position of the center of gravity relative to the press shoe 16.

Landscapes

  • Paper (AREA)
EP97111129A 1996-08-05 1997-07-03 Dispositif de pressage Ceased EP0823507A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1996131637 DE19631637A1 (de) 1996-08-05 1996-08-05 Pressenanordnung
DE19631637 1996-08-05

Publications (2)

Publication Number Publication Date
EP0823507A2 true EP0823507A2 (fr) 1998-02-11
EP0823507A3 EP0823507A3 (fr) 1999-02-03

Family

ID=7801870

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97111129A Ceased EP0823507A3 (fr) 1996-08-05 1997-07-03 Dispositif de pressage

Country Status (2)

Country Link
EP (1) EP0823507A3 (fr)
DE (1) DE19631637A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6790316B1 (en) 1999-06-03 2004-09-14 Metso Paper, Inc. Method and arrangement for positioning a shoe of a shoe press/shoe calendar in a paper machine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20218393U1 (de) * 2002-06-25 2003-03-20 Voith Paper Patent Gmbh Vorrichtung zur Beeinflussung eines Pressdruckprofils
DE10229155A1 (de) * 2002-06-28 2004-01-15 Voith Paper Patent Gmbh Vorrichtung und Verfahren zur Beeinflussung eines Pressdruckpofils
DE10233924A1 (de) * 2002-07-25 2004-02-12 Voith Paper Patent Gmbh Verfahren zum Betreiben einer Papiermaschine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4713147A (en) * 1982-05-05 1987-12-15 Oy Tampella Ab Extended nip press with displaceable center of gravity for the supporting force
US5167768A (en) * 1991-11-07 1992-12-01 Beloit Corporation Wide nip web press and method using a press shoe with two pivots
DE4425915A1 (de) * 1994-07-21 1996-02-01 Voith Sulzer Papiermasch Gmbh Langspalt-Presse
DE19607144A1 (de) * 1996-02-26 1997-08-28 Voith Sulzer Papiermasch Gmbh Preßvorrichtung

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3503819A1 (de) * 1984-12-21 1986-06-26 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Hydraulischer pressschuh sowie dessen verwendung und betrieb
DE4423694C2 (de) * 1994-07-06 2000-03-16 Voith Sulzer Papiermasch Gmbh Langspaltpresse

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4713147A (en) * 1982-05-05 1987-12-15 Oy Tampella Ab Extended nip press with displaceable center of gravity for the supporting force
US4713147B1 (en) * 1982-05-05 1996-12-31 Valmet Paper Machinery Inc Extended nip press with displaceable centre of gravity for the supporting force
US4713147B2 (en) * 1982-05-05 1997-11-04 Valmet Paper Machinery Inc Extended nip press with displaceable center of gravity for the supporting force
US5167768A (en) * 1991-11-07 1992-12-01 Beloit Corporation Wide nip web press and method using a press shoe with two pivots
DE4425915A1 (de) * 1994-07-21 1996-02-01 Voith Sulzer Papiermasch Gmbh Langspalt-Presse
DE19607144A1 (de) * 1996-02-26 1997-08-28 Voith Sulzer Papiermasch Gmbh Preßvorrichtung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6790316B1 (en) 1999-06-03 2004-09-14 Metso Paper, Inc. Method and arrangement for positioning a shoe of a shoe press/shoe calendar in a paper machine

Also Published As

Publication number Publication date
DE19631637A1 (de) 1998-02-12
EP0823507A3 (fr) 1999-02-03

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