EP1033436A2 - Procédé et dispositif pour le dosage d'un milieu fluide dans l'écoulement d'une suspension dans une caisse de tête - Google Patents

Procédé et dispositif pour le dosage d'un milieu fluide dans l'écoulement d'une suspension dans une caisse de tête Download PDF

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Publication number
EP1033436A2
EP1033436A2 EP99118683A EP99118683A EP1033436A2 EP 1033436 A2 EP1033436 A2 EP 1033436A2 EP 99118683 A EP99118683 A EP 99118683A EP 99118683 A EP99118683 A EP 99118683A EP 1033436 A2 EP1033436 A2 EP 1033436A2
Authority
EP
European Patent Office
Prior art keywords
channel
metering
headbox
fluid medium
pressure loss
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
Application number
EP99118683A
Other languages
German (de)
English (en)
Other versions
EP1033436B1 (fr
EP1033436A3 (fr
Inventor
Wolfgang Ruf
Hans Loser
Klaus Lehleiter
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 Paper Patent 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
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Application filed by Voith Paper Patent GmbH, Voith Sulzer Papiertechnik Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1033436A2 publication Critical patent/EP1033436A2/fr
Publication of EP1033436A3 publication Critical patent/EP1033436A3/fr
Application granted granted Critical
Publication of EP1033436B1 publication Critical patent/EP1033436B1/fr
Anticipated expiration legal-status Critical
Revoked 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
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/022—Means for injecting material into flow within the headbox
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/026—Details of the turbulence section
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/06—Regulating pulp flow
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/08—Regulating consistency

Definitions

  • the invention relates to a method for metering a fluid medium into a stock suspension stream of a headbox, the stock suspension stream being distributed in the headbox over the machine width, passed into a plurality of turbulence-producing channels and being conveyed to the headbox nozzle. Furthermore, in the region of the turbulence-generating ducts, a total pressure loss ⁇ P tot is effected, which consists of at least one inlet pressure loss ⁇ P inlet when entering the ducts and a step pressure loss ⁇ P stage due to at least one change in cross-section within the ducts.
  • the fluid medium is metered in at least one of the channels between the channel inlet and the channel outlet.
  • the invention also relates to a headbox of a paper or board machine with at least one machine width Stock suspension feed, at least one turbulence generator with a variety of channels through which suspensions flow, a large number of metering points for a fluid medium in the Area of at least one of the channels and a subsequent one Headbox nozzle.
  • the preamble-forming publication DE 35 14 554 A1 shows a headbox with a machine-wide suspension feed, one Turbulence generator with several suspensions Channels, the channels having a plurality of metering points for a fluid medium in some of the channels, and one adjoining the turbulence generator Headbox nozzle.
  • a method for metering a fluid Medium in a stock suspension stream of a headbox discloses, in which the stock suspension stream over the Machine width divided into a variety of turbulence generating channels and through them to Headbox nozzle is directed.
  • the stock suspension stream over the Machine width divided into a variety of turbulence generating channels and through them to Headbox nozzle is directed.
  • the field of turbulence-generating channels becomes a total pressure loss generated, at least from the inlet pressure loss in the Channels and the subsequent pressure drop Cross-sectional changes occur within the channels.
  • the fluid medium is metered in part of the Channels, between channel entry and channel exit.
  • the object of the invention is a method for metering of a fluid medium in a stock suspension stream Headbox in the area of the turbulence-generating channels specify the metering of the fluid medium influences on the total throughput of the channel. It is also an object of the invention to represent a headbox that is necessary to carry out the method according to the invention is suitable.
  • the task is characterized by the characteristics of the first Process claim and the features of the first Device claim solved.
  • the inventors have recognized that through the previous Designs of the headbox the fundamentally necessary Pressure loss on a turbulence insert with turbulence channels or turbulence pipes mainly through the Inlet pressure loss at the transition between the cross distributor of the headbox for turbulence use. Since in downstream part of the turbulence insert only one low pressure gradient arises, metering in this area intense and undesirable on the Total throughput of the respective channel.
  • the solution of the The above problem is that the Inlet pressure loss through an appropriate design of the Turbulence channel in the initial area clearly compared to that in the further course of the channel resulting pressure loss is reduced.
  • the inventor proposes to improve the method for metering a fluid medium into a stock suspension stream of a headbox, the stock suspension stream being distributed in the headbox over the machine width into a large number of turbulence-producing channels which convey the stock suspension to the headbox nozzle, in the region of the turbulence-generating nozzle Channels a total pressure loss ⁇ P tot is caused, which arises from at least one inlet pressure loss ⁇ P inlet when entering the channels and a step pressure loss ⁇ P stage by at least one of the cross-sectional changes within the channels, and the metering of the fluid medium in the area of at least one of the channels between the channel inlet and channel exit occurs.
  • the improvement according to the invention consists in that at least 50% of the total pressure loss ⁇ P total is generated downstream of the metered addition of the fluid medium.
  • the proportion of the pressure loss that is generated downstream of the metering in of the fluid medium should preferably be a maximum of 75% of the total pressure loss ⁇ P tot .
  • a particularly preferred embodiment provides that 50% - 60% of the total pressure drop ⁇ P tot is generated downstream of the metering of the fluid medium.
  • This design of the headbox is on the one hand achieves the addition of fluids, for example of Dilution water, in the turbulence insert Headbox only minimal changes regarding the local total throughput on the turbulence insert and on the other hand also a clearly defined range of effectiveness of the Dosing is given in the range of normal controlled variables is almost independent of the amount of fluid added.
  • the total pressure loss ⁇ P tot is 0.3 ⁇ 10 5 Pa to 8 ⁇ 10 5 Pa, an overall pressure loss of 4 ⁇ 10 5 Pa to 8 ⁇ 10 5 Pa being preferred.
  • This relatively high total pressure loss results in a further reduction in the influence on the local total volume flow with different metering.
  • inlet pressure loss ⁇ P inlet is kept low by using a venturi cross-section in the channel, since this does not result in any separation areas for the inflow.
  • Another advantageous embodiment of the method provides before that the metering of the fluid medium in at least a channel against the main flow direction of the Fabric suspension takes place. This will be an optimal one Mixing of the injected fluid with the main flow of the Stock suspension reached.
  • the fluid is metered in Medium in all channels of the turbulence generator or at least evenly distributed over the entire web width he follows.
  • the basis weight cross profile and / or that Fiber orientation cross profile through the metering for example white water or another fluid, whose concentration was spread across the machine Material suspension flow differs to adjust.
  • the basis weight cross profile and the basis weight profile in the z direction is also based on the Applications DE 44 22 907 and DE 196 32 673 A1 noted and the full disclosure of which is disclosed.
  • the idea of the invention is also due to further development a headbox of a paper or board machine with at least one machine-wide stock suspension feed, at least one turbulence generator with a variety of channels through which suspensions flow, a variety of Dosing points for a fluid medium in the range at least one of the channels and a subsequent headbox nozzle realized by at least one of the channels of the Turbulence generator is designed such that the proportion the flow resistance downstream of the metering point is at least 50% of the total resistance of the channel.
  • the proportion of the flow resistance should preferably be after the metering point a maximum of 75% of the total resistance of the Channel, with a distribution of the resistances before and preferred according to the metering point, in which 50% to 60% of the total resistance downstream of the metering point are arranged.
  • At least one channel with a metering point has a chamfer at the entry area.
  • the chamfer has one Depth t in the range from 2 mm to 10 mm, preferably in Range from 4 mm to 6 mm, with a bevel angle ⁇ between 20 ° and 80 °.
  • An inventive headbox is also advantageous which the outflow opening of the metering point against Main flow direction of the stock suspension directed in the channel is. This ensures optimal mixing of the metered amounts Liquid in the stock suspension stream reached.
  • Figure 1 shows a schematic representation of the Cross section of a headbox in the area of a Turbulence channel 1.
  • the turbulence channel 1 connects the machine width Material suspension distribution (left side) with the Headbox nozzle (right side).
  • Turbulence channel on the inlet side of the stock suspension a strong chamfer 4 on the inlet pressure loss on this Place should decrease.
  • the Dosing opening 3 is via a feed channel 2 for the fluid medium fed. Through this metering opening 3 can more or less fluid medium in the stock suspension stream Headbox are fed.
  • the main flow direction of the Stock suspension flow is indicated by arrow 10.
  • the Flow direction 11 of the metered fluid runs in Initial area essentially perpendicular to Main flow direction 10.
  • This configuration of the channel 1 and Positioning the metering opening 3 is achieved that the main pressure loss in the area of the strongest Constriction 6 takes place, seen in the direction of flow is arranged behind the metering point. This causes the influence of metering on the whole Flow throughput in channel 1 is very low, in particular that there are only slight fluctuations in total throughput, if different amounts of fluid medium are also in channel 1 can be fed.
  • Figure 2 shows also a section from the turbulence generator Headbox with channel 1 and a metering opening 3 for a fluid medium in the channel 1.
  • the channel In the entrance area is the channel with a pressure-reducing chamfer 4, followed by a straight course of the channel 1 into which the metering opening 3 flows. It goes straight downstream of the metering opening 3 Course of the channel 1 in a corrugated contour through which the Main pressure loss occurs within the channel 1.
  • a first step change 8 instead, which is an essentially undisturbed, cylindrical course of the channel 1 follows.
  • This embodiment also ensures that the main part of the total pressure loss or total resistance downstream of the Dosing point for the fluid medium takes place.
  • FIG. 3 shows a variant of a channel 1 in which the metering opening 3 for the fluid medium in the course of strongest constriction 6 opens into channel 1. Subsequent to this narrowest area of channel 1 is followed by a diffuser-like, conical extension 7 of the channel 1 towards a corrugated contour 12 that without a paragraph in one smooth cylindrical section of the channel 1 merges.
  • FIG. 4 shows a further variant of the invention designed channel 1 of a headbox.
  • the Entrance area is with a Venturi contour 13 equipped with a parabolic Has course and in a smooth cylindrical section passes over, the cross section of which is larger than that Entrance cross-section is in the venturi opening.
  • these smooth cylindrical section 16 opens the metering opening 3. This is followed by a conical narrowing 5, which in one narrowest cylindrical region 6 passes, followed by one conical extension 7, which in turn is a smooth cylindrical region 16 with a relatively large cross section connects.
  • This embodiment also makes the main resistance or main pressure loss behind the metering point shifted for the fluid medium.
  • FIG. 5 shows a further variant of the execution of the Dosing point in channel 1 of the invention Turbulence generator of a headbox.
  • Turbulence generator of a headbox At this Embodiment becomes a relatively narrow, cylindrical area 6 narrowed again by an annular gap 14 which with the Metering opening 3 for metering a fluid medium communicates.
  • the channel-side opening of the annular gap 14 is the main flow direction 10 through the channel 1 passed material suspension directed against.
  • the Annular gap 14 itself forms the narrowest point in the whole Channel 1, so that here too most of the Flow resistance and thus the pressure loss behind the Dosing point for the fluid medium is arranged.
  • the inventive design of the Headbox or by performing the inventive method in the headbox shown achieves that the total throughput through a channel of Turbulence insert largely independent of the the metered amount of the fluid medium remains and therefore hardly an influence on the fiber orientation cross profile or that Grammage cross section.

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  • Paper (AREA)
EP99118683A 1999-03-02 1999-09-22 Procédé et dispositif pour le dosage d'un milieu fluide dans l'écoulement d'une suspension dans une caisse de tête Revoked EP1033436B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19908898 1999-03-02
DE19908898A DE19908898A1 (de) 1999-03-02 1999-03-02 Verfahren zur Zudosierung eines fluiden Mediums in einen Suspensionsstrom eines Stoffauflaufes und Stoffauflauf

Publications (3)

Publication Number Publication Date
EP1033436A2 true EP1033436A2 (fr) 2000-09-06
EP1033436A3 EP1033436A3 (fr) 2001-03-21
EP1033436B1 EP1033436B1 (fr) 2006-01-11

Family

ID=7899314

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99118683A Revoked EP1033436B1 (fr) 1999-03-02 1999-09-22 Procédé et dispositif pour le dosage d'un milieu fluide dans l'écoulement d'une suspension dans une caisse de tête

Country Status (4)

Country Link
US (2) US6464837B1 (fr)
EP (1) EP1033436B1 (fr)
AT (1) ATE315681T1 (fr)
DE (2) DE19908898A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1195463A2 (fr) * 2000-10-04 2002-04-10 Sandusky Walmsley Ltd. Caisse de tête pour machine à papier
WO2011088888A2 (fr) 2010-01-19 2011-07-28 Metso Paper, Inc. Caisse de tête basse consommation
WO2011160865A3 (fr) * 2010-06-22 2012-02-23 Voith Patent Gmbh Caisse de tête pour une machine de production d'une bande de matière fibreuse
US9416497B2 (en) 2012-07-05 2016-08-16 Rail.One Gmbh Device for fastening a rail to a carrier

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10208610B4 (de) * 2002-02-27 2014-03-06 Voith Patent Gmbh Verfahren zum Verteilen einer Faserstoffsuspension im Stoffauflauf einer Papier- oder Kartonmaschine und Stoffauflauf
DE102004055919A1 (de) * 2004-11-19 2006-05-24 Voith Paper Patent Gmbh Stoffauflauf
US20060173313A1 (en) * 2005-01-27 2006-08-03 Siemens Medical Solutions Usa, Inc. Coherence factor adaptive ultrasound imaging
EP2145468B1 (fr) 2007-04-11 2012-09-12 GVBB Holdings S.A.R.L Procédé et appareil pour améliorer des effets vidéo numériques (dve)
US8871059B2 (en) * 2012-02-16 2014-10-28 International Paper Company Methods and apparatus for forming fluff pulp sheets

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0635599A1 (fr) * 1993-07-01 1995-01-25 Valmet Paper Machinery Inc. Procédé et dispositif pour la régulation d'une caisse de tête
DE19632673A1 (de) * 1996-08-14 1998-02-19 Voith Sulzer Papiermasch Gmbh Stoffauflauf und Verfahren zur Verteilung einer Faserstoffsuspension im Stoffauflauf einer Papiermaschine

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3514554C3 (de) * 1984-09-19 1998-01-08 Escher Wyss Gmbh Stoffauflauf-Vorrichtung für eine Papiermaschine und Verfahren zu deren Betrieb
DE4211291C3 (de) * 1992-04-03 2001-06-07 Voith Gmbh J M Mischeinrichtung und Verfahren zum Mischen von zwei Flüssigkeiten bei konstantem Gemischvolumenstrom zur Versorgung des Stoffauflaufs einer Papiermaschine
DE4323263C2 (de) * 1993-07-12 2001-11-29 Voith Paper Patent Gmbh Verfahren zur sektionalen Beeinflussung der Stoffdichte und der Faserorientierung in einem Stoffauflauf einer Papiermaschine und Stoffauflauf zur Durchführung des Verfahrens
DE4422907C2 (de) 1994-06-30 1997-03-06 Voith Gmbh J M Sektionale Stoffzuführung des Stoffauflaufs einer Papiermaschine
US5626722A (en) * 1995-06-01 1997-05-06 Valmet Corporation Headbox of a paper/board machine
DE19634993A1 (de) * 1996-08-30 1998-03-05 Voith Sulzer Papiermasch Gmbh Verfahren und Vorrichtung zum Einstellen des Stoffdichte- und Faserorientierungsprofils in einem Stoffauflauf
US6117272A (en) * 1998-09-03 2000-09-12 Voith Sulzer Papiermaschinen Device and process for metering auxiliary materials into the flow box of a paper machine
FI113672B (fi) * 1999-04-28 2004-05-31 Metso Paper Inc Menetelmä ja laitteisto laimennusnesteen sekoittamiseksi massavirtaukseen paperikoneessa tai kartonkikoneessa
FI116470B (fi) * 1999-10-04 2005-11-30 Metso Paper Inc Menetelmä paperirainan muodostamiseksi

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0635599A1 (fr) * 1993-07-01 1995-01-25 Valmet Paper Machinery Inc. Procédé et dispositif pour la régulation d'une caisse de tête
DE19632673A1 (de) * 1996-08-14 1998-02-19 Voith Sulzer Papiermasch Gmbh Stoffauflauf und Verfahren zur Verteilung einer Faserstoffsuspension im Stoffauflauf einer Papiermaschine

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1195463A2 (fr) * 2000-10-04 2002-04-10 Sandusky Walmsley Ltd. Caisse de tête pour machine à papier
EP1195463A3 (fr) * 2000-10-04 2003-04-09 Sandusky Walmsley Ltd. Caisse de tête pour machine à papier
WO2011088888A2 (fr) 2010-01-19 2011-07-28 Metso Paper, Inc. Caisse de tête basse consommation
WO2011160865A3 (fr) * 2010-06-22 2012-02-23 Voith Patent Gmbh Caisse de tête pour une machine de production d'une bande de matière fibreuse
CN102947504A (zh) * 2010-06-22 2013-02-27 沃依特专利有限责任公司 用于制造纤维料幅的机器的流浆箱
CN102947504B (zh) * 2010-06-22 2015-04-15 沃依特专利有限责任公司 用于制造纤维料幅的机器的流浆箱
US9416497B2 (en) 2012-07-05 2016-08-16 Rail.One Gmbh Device for fastening a rail to a carrier

Also Published As

Publication number Publication date
US6890408B2 (en) 2005-05-10
EP1033436B1 (fr) 2006-01-11
DE19908898A1 (de) 2000-09-07
ATE315681T1 (de) 2006-02-15
US6464837B1 (en) 2002-10-15
EP1033436A3 (fr) 2001-03-21
DE59913039D1 (de) 2006-04-06
US20030000674A1 (en) 2003-01-02

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