EP1496150A1 - Caisse de tête - Google Patents

Caisse de tête Download PDF

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Publication number
EP1496150A1
EP1496150A1 EP04102972A EP04102972A EP1496150A1 EP 1496150 A1 EP1496150 A1 EP 1496150A1 EP 04102972 A EP04102972 A EP 04102972A EP 04102972 A EP04102972 A EP 04102972A EP 1496150 A1 EP1496150 A1 EP 1496150A1
Authority
EP
European Patent Office
Prior art keywords
headbox
intermediate channel
turbulence
actuator
machine
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
EP04102972A
Other languages
German (de)
English (en)
Inventor
Hans Loser
Wolfgang Ruf
Uli Dürr
Konstantin Fenkl
Thomas Böhringer
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
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
Priority claimed from DE2003131040 external-priority patent/DE10331040A1/de
Priority claimed from DE200410008651 external-priority patent/DE102004008651A1/de
Application filed by Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1496150A1 publication Critical patent/EP1496150A1/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
    • 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
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • D21G9/0027—Paper-making control systems controlling the forming section

Definitions

  • the invention relates to a headbox for a machine for producing a Fiber web, in particular paper or board web, with a direction transverse to the machine direction subdivided dilution device, in particular white water metering device, in the machine direction in a transverse direction extending intermediate channel, a plurality of turbulence channels downstream turbulence generator and a nozzle which is connected to a A pulp suspension jet supplying exit slit is provided. It concerns Furthermore, provided with such a headbox machine for the production a fibrous web, in particular paper and / or board web.
  • Headboxes of the type mentioned are for example from the documents EP 0 772 711 B1, EP 0 857 816 B1, DE 35 14 544 A1, DE 40 25 675 A1 and US Pat. No. 5,833 808 known.
  • the fiber orientation profile is influenced by an adjustment provided in the region of the exit slit of the headbox Aperture, a modification of the turbulence insert and an influence of the Throughput in the peripheral zones.
  • the previously customary influencing of the throughput In the fringe areas there are the disadvantages, among others, that in These margins no dilution water addition is possible and problems in connection with the lamella connection.
  • the invention is based on the object, an improved headbox of to provide the aforementioned type in which eliminates the aforementioned problems are.
  • the headbox should be kept as simple as possible.
  • the dilution device a plurality of mixing chambers arranged side by side in the transverse direction includes, each of which sub-streams of different consistency are supplied and which each deliver a mixed stream into the intermediate channel, that for influencing of the transverse fiber orientation profile, the volume flows at least that of the lateral edge zones of the intermediate channel supplied Mixed currents in each case correspondingly variable via at least one actuator are adjustable and that at least the lateral edge zones of the intermediate channel are each separated from the rest of the intermediate channel area.
  • Headboxes are used to influence the transverse fiber orientation profile only the volume flows of the lateral edges of the Intermediate channels supplied mixed streams in each case via at least one actuator according to variably adjustable.
  • the edge zones in the intermediate channel are So sealed against a central main zone, as for the influence of the edge volume flow in the jet, a pressure difference between the main chamber and the marginal chamber is adjusted.
  • Headboxes are the actuators at least partially on the exit side Ends of the mixing chambers provided.
  • each provided at least one actuator be variable to the respective volume flow of the corresponding partial flow to make adjustable.
  • the actuator is at the exit end of the respective Mixing chamber preferably adjusted so that it in the corresponding Mixed flow produces a local pressure loss in the range of 0 to 500 mbar, and the actuator provided at the entrance end of the respective mixing chamber is preferably set such that it in the corresponding partial flow a local pressure loss generated in the range of 300 to 2,000 mbar. This means, this is the amount of volume flow in the peripheral zones via the dilution water valve can be adjusted and regulated.
  • the relevant actuators can each be formed by an adjustable throttle.
  • the distributor preferably comprises a plurality of distribution channels, in particular distribution pipes, wherein the mixed streams be supplied via the distribution channels to the intermediate channel.
  • the separation of adjacent intermediate channel areas is expediently carried out each by a partition.
  • the partitions can each at least in Essentially over the entire measured in the machine direction length of the Extend intermediate channels. They can be formed for example by separating plates be.
  • the partitions can at least partially used for example in grooves be in the distribution bar, the headbox and / or the turbulence generator are provided.
  • the grooves can for example be milled.
  • the aligned in grooves in the machine direction partitions are expediently in particular via bolts and / or the like a headbox such as in particular the format plate and / or the like attached.
  • the partitions can each with a groove with a seal, in particular felt seal and / or the like, be provided.
  • the turbulence channels of the turbulence generator can at least partially through Turbulence pipes be formed.
  • the turbulence generator can be used in particular as a turbulence insert be provided.
  • the turbulence generator expediently a larger Passage cross-section than the remaining turbulence channels.
  • the inventive machine for producing a fibrous web in particular Paper and / or cardboard web, characterized by the fact that they are with a Headbox invention is provided.
  • a fiber orientation control system be provided, which provided at the end of the machine Device for measuring the fiber orientation cross section of the Fibrous web, one of the obtained measuring signals processing Computing unit and the actuators of the headbox includes.
  • FIG. 1 shows a schematic, partially sectioned illustration of one Headbox 10 for a machine for making a fibrous web containing it in particular may be a paper or board web.
  • the headbox 10 comprises a transverse to the machine direction L subdivided dilution device 12, in particular Siebwasserdostechniks worn, the in Machine direction L a distributor 14, extending in the transverse direction Intermediate channel 16, a turbulence generator having a plurality of turbulence channels 18 20 and a nozzle 22 is connected downstream, which with a a pulp suspension jet 24 supplying exit slit 26 is provided.
  • the diluter 12 includes a plurality of transversely adjacent to each other arranged mixing chambers 28, which each sub-streams of different consistency can be fed and via the manifold 14 each have a mixed stream in provide the intermediate channel 16.
  • the respective partial flows are the corresponding Mixing chamber 28 at an angle ⁇ fed, wherein the angle ⁇ is a value in the range of 0 to 180 °.
  • the two partial flows can be rectified, swept or counter-directed to the corresponding one Be fed mixing chamber 28.
  • the respective partial flows of the corresponding Mixing chamber 28 can be fed at a respective speed, wherein the inflow velocity of the second partial flow is generally greater, preferably substantially greater than the speed of the first partial flow is.
  • the dilution device 12 comprises a transverse distributor 30, via which the mixing chambers 28 a pulp suspension Q H high consistency is supplied, and metering valves 32 through which the mixing chambers 28, for example, pulp suspensions Q L low consistency C L can be fed.
  • the dilution device 12 may be, for example, a white water dosing system of the type provided in connection with the ModuleJet® headbox available on the market.
  • the ModuleJet® headbox is described for example in German Patent DE 40 19 593 C2.
  • the distributor 14 may be provided in particular in the form of a distributor strip and a plurality of distribution channels 34 formed, for example, by distribution pipes comprise, over which the mixed streams supplied by the mixing chambers 28 the Intermediate channel 16 are supplied.
  • the turbulence generator 20 can be provided in particular as a turbulence insert be.
  • the turbulence channels 18 can in particular by turbulence pipes be formed.
  • Fiber orientation profiles only the volume flows of the lateral edge zones 38 of the intermediate channel 16 supplied mixed streams in each case via at least one Actuator 36 correspondingly variably adjustable. Moreover, in the present case also only the lateral edge zones 38 of the intermediate channel 16 in each case from the rest Split between the intermediate channel area, so that in the transverse direction between the two lateral separated edge zones 38 a not divided middle Main zone 40 of the intermediate channel 16 results.
  • the actuators 36 are on the outlet side Ends of the mixing chambers 28 are provided. You can each through a be formed adjustable throttle over which the flow rate concerned, the distributor 14 supplied mixed flow is variably adjustable.
  • At least one actuator 56 is also provided at the inlet-side ends of the mixing chambers 28 in order to make the respective volume flow of the corresponding partial flow (pulp suspension Q H of high consistency C H ) variably adjustable.
  • the actuator 36 provided at the outlet end of the respective mixing chamber 28 is set in such a way that it generates a local pressure drop in the corresponding mixing flow in the range from 0 to 500 mbar, and that the actuator provided at the inlet end of the respective mixing chamber 28 56 is set so that it generates a local pressure drop in the range of 300 to 2,000 mbar in the corresponding partial flow.
  • a pressure drop in the range of 0 mbar on the actuator 36 would of course mean no pressure drop.
  • the separation of the two edge zones 38 of the intermediate channel 16 from the main zone 40 takes place in each case by a partition 42.
  • the partitions 42 can each at least substantially over the whole in the machine direction L measured length of the intermediate channel 16 extend. You can in particular be formed by separating plates or the like.
  • the partitions 42 may expediently at least partially in grooves be used in the distributor 14 and in the distribution bar, the headbox 44, the turbulence generator 20 and / or the like are provided.
  • the grooves can be milled in particular.
  • the partition walls 42nd expediently each with a groove with seal, in particular Felt seal, provided.
  • turbulence channels 18 of the turbulence generator 20 has a larger passage cross-section own than the remaining turbulence channels 18th
  • FIG. 2 shows, in a simplified schematic representation, one with a headbox 10 provided in accordance with the figure 1 machine 48 for producing a fibrous web, in particular paper or board web, in which the headbox 10th is incorporated into a fiber orientation control system 50.
  • the fiber orientation control system 50 includes a device provided at the machine end 52 for measuring the fiber orientation cross profile of the fibrous web, a the received measurement signals processing unit 54 and the actuators 36 of the headbox 10th
EP04102972A 2003-07-09 2004-06-25 Caisse de tête Ceased EP1496150A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10331040 2003-07-09
DE2003131040 DE10331040A1 (de) 2003-07-09 2003-07-09 Stoffauflauf
DE200410008651 DE102004008651A1 (de) 2004-02-21 2004-02-21 Stoffauflauf
DE102004008651 2004-02-21

Publications (1)

Publication Number Publication Date
EP1496150A1 true EP1496150A1 (fr) 2005-01-12

Family

ID=33453886

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04102972A Ceased EP1496150A1 (fr) 2003-07-09 2004-06-25 Caisse de tête

Country Status (1)

Country Link
EP (1) EP1496150A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1734178A1 (fr) * 2005-06-13 2006-12-20 Voith Patent GmbH Caisse de tête d'une machine de fabrication d' une bande fibreuse, en particulier une bande de papier ou de carton
WO2010069652A1 (fr) * 2008-12-18 2010-06-24 Voith Patent Gmbh Caisson de tête pour machine de fabrication d'une bande de matière fibreuse
EP2022889A3 (fr) * 2007-07-25 2011-12-21 Voith Patent GmbH Dispositif et procédé de réglage en ligne du profilé transversal d'orientation des fibres
CN112411242A (zh) * 2020-10-26 2021-02-26 华南理工大学 基于等量法添加稀释水调节纸张横幅定量的方法及装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4955720A (en) * 1989-01-05 1990-09-11 International Paper Company On-line fiber orientation distribution measurement
EP0629739A1 (fr) * 1993-06-18 1994-12-21 Voith Sulzer Papiermaschinen GmbH Caisse de tête pour machine à papier
EP0635599A1 (fr) * 1993-07-01 1995-01-25 Valmet Paper Machinery Inc. Procédé et dispositif pour la régulation d'une caisse de tête
DE10026308A1 (de) * 1999-05-27 2000-12-21 Valmet Corp Stoffauflauf einer Papiermaschine oder Kartonmaschine
DE10008462A1 (de) * 2000-02-23 2001-08-30 Voith Paper Patent Gmbh Verfahren zur Herstellung von mindestens einem Überführstreifen aus einer Papierbahn und Papiermaschine zur Durchführung des Verfahrens

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4955720A (en) * 1989-01-05 1990-09-11 International Paper Company On-line fiber orientation distribution measurement
EP0629739A1 (fr) * 1993-06-18 1994-12-21 Voith Sulzer Papiermaschinen GmbH Caisse de tête pour machine à papier
EP0635599A1 (fr) * 1993-07-01 1995-01-25 Valmet Paper Machinery Inc. Procédé et dispositif pour la régulation d'une caisse de tête
DE10026308A1 (de) * 1999-05-27 2000-12-21 Valmet Corp Stoffauflauf einer Papiermaschine oder Kartonmaschine
DE10008462A1 (de) * 2000-02-23 2001-08-30 Voith Paper Patent Gmbh Verfahren zur Herstellung von mindestens einem Überführstreifen aus einer Papierbahn und Papiermaschine zur Durchführung des Verfahrens

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1734178A1 (fr) * 2005-06-13 2006-12-20 Voith Patent GmbH Caisse de tête d'une machine de fabrication d' une bande fibreuse, en particulier une bande de papier ou de carton
EP2022889A3 (fr) * 2007-07-25 2011-12-21 Voith Patent GmbH Dispositif et procédé de réglage en ligne du profilé transversal d'orientation des fibres
WO2010069652A1 (fr) * 2008-12-18 2010-06-24 Voith Patent Gmbh Caisson de tête pour machine de fabrication d'une bande de matière fibreuse
CN112411242A (zh) * 2020-10-26 2021-02-26 华南理工大学 基于等量法添加稀释水调节纸张横幅定量的方法及装置

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