EP1734178A1 - Caisse de tête d'une machine de fabrication d' une bande fibreuse, en particulier une bande de papier ou de carton - Google Patents

Caisse de tête d'une machine de fabrication d' une bande fibreuse, en particulier une bande de papier ou de carton Download PDF

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Publication number
EP1734178A1
EP1734178A1 EP06112919A EP06112919A EP1734178A1 EP 1734178 A1 EP1734178 A1 EP 1734178A1 EP 06112919 A EP06112919 A EP 06112919A EP 06112919 A EP06112919 A EP 06112919A EP 1734178 A1 EP1734178 A1 EP 1734178A1
Authority
EP
European Patent Office
Prior art keywords
headbox
machine
lamellae
upstream
width
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.)
Withdrawn
Application number
EP06112919A
Other languages
German (de)
English (en)
Inventor
Wolfgang Ruf
Karl Bunz
Ole Hansen
Klaus Lehleiter
Konstantin Fenkl
Uli Dürr
Simon Juhas
Jens Haessner
Hans Loser
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 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 Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1734178A1 publication Critical patent/EP1734178A1/fr
Withdrawn legal-status Critical Current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
    • 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 headbox for a machine for producing a fibrous web, in particular a paper or board web, with at least one distribution device for distributing a pulp suspension across the machine width, in the machine direction a dilution device, in particular a Siebwasserdosier landmark, which arranged a plurality of transverse to the machine direction side by side Mixing chambers comprises, each of which sub-streams of different consistency are supplied and each provide a partial mixing stream, a machine-width intermediate chamber which receives the respective partial mixing streams, a turbulence generator and a headbox nozzle, which is provided with a pulp suspension jet supplying exit slit, are arranged downstream.
  • Such a headbox is for example from the German patent DE 40 19 593 C2 known.
  • the transition from the dilution device into the machine-width intermediate chamber via the increment takes place with a speed ratio of approximately 50%, that is, the pulp suspension is braked by about half in their flow rate. Subsequently, the braked pulp suspension flows over a distance of about 250 to 500 mm to the turbulence generator.
  • this embodiment has the fluidic disadvantage that coarse in the pulp suspension in the region of its flow from the dilution device to the machine-width intermediate chamber Turbulence arise, which can lead to a turbulence of the individual partial mixing streams.
  • the free distance between the upstream assembly such as the diluter and the turbulizer is significantly shortened. Due to the articulated mounting of the lamellae, the partial mixing streams are hydraulically coupled, so that no pressure differences across the machine direction and thus no speed differences of the partial mixing streams transversely to the machine direction more arise. Thus, there is no turbulence of the individual partial mixing streams more, the individual partial mixed streams are on a longer Distance separated from each other and they experience a sectional flow orientation. Differences in throughput of the headbox, especially in the area of the highly consistent pulp suspension, no longer lead to previously existing and undefined cross flows upstream of the turbulence generator.
  • the lamellae advantageously have a stiffness of at least 5 Nm, preferably of at least 10 Nm, for at least 7/10 of their length.
  • s stiffness of the lamella
  • E modulus of elasticity of the lamellar material
  • h thickness of the lamella
  • v transverse strain number (reciprocal of the Poisson's number).
  • the lamellae favorably have a pitch which is less than or equal to 100 mm, preferably less than or equal to 70 mm.
  • a desired guidance of small, that is narrow partial mixing streams is possible.
  • the slats may have a length which is in the range of 2 to 10 times the pitch of the slats.
  • the lamellae can have a pitch which is a multiple of the pitch of the upstream module. This embodiment makes it possible to combine a plurality of smaller partial mixing streams into larger partial mixing streams.
  • a preferred distance of less than or equal to 300 mm, preferably less than or equal to 100, should be provided between the fin ends and the downstream turbulence generator.
  • the partial mixing streams even at lower flow velocities, no longer have sufficient time to fluidize each other.
  • the holder is preferably arranged between two units of the upstream module.
  • the holder is in this case preferably formed by a segmented or continuous hinge, in whose leadership engages at least one preferably provided on the respective fin end dome-shaped, circular segment or ball-like element.
  • a type of holder is already known in the field of mounting of arranged in the headbox slats. This has proven itself well in the past.
  • the upstream module can be the dilution device, the lamellae preferably being articulated to it via the holders.
  • a straightening zone is preferably arranged between the thinning device and the machine-width intermediate chamber, which comprises at least structures, in particular wings, for guiding the respective partial mixing streams in the machine direction.
  • the straightening zone the same is the upstream assembly, the slats being hingedly connected thereto via the brackets.
  • the straightening zone thus serves primarily for alignment and steering of the respective partial mixing streams in the machine direction. Any cross-flow and swirl components present in the respective sub-mixed stream are to be dissolved.
  • the inventive machine for producing a fibrous web in particular paper and / or board web, is characterized in that it is provided with a head box according to the invention.
  • FIG. 1 shows a schematic, partially sectioned view of a headbox 1 for a machine for producing a fibrous web.
  • the headbox 1 has a distribution device 2 for distributing a pulp suspension 3 across the machine width M (double arrow), which in the machine direction L (arrow) a dilution device 4, which comprises a plurality of transverse to the machine direction L (arrow) juxtaposed mixing chambers 5, which each sub-streams T (arrow) of different consistency c T can be fed and each deliver a partial mixing current T M (arrow), is arranged downstream.
  • the distribution device 2 is in the embodiment of Figure 1 is a parabolic transverse distribution tube 6, in a further embodiment not shown, however, it may also be designed as a circular distributor.
  • the diluter 4 may be a known white water metering system as provided in conjunction with the ModuleJet® headbox available on the market.
  • the ModuleJet® headbox is, for example, in the already cited German patent DE 40 19 593 C2 described.
  • the dilution device 4 are in machine direction L (arrow) downstream of a machine-wide intermediate chamber 7, which receives the respective partial mixing streams T M (arrow), a turbulence generator 8 and a headbox 9, which is provided with a pulp suspension jet 11 supplying exit slit 10.
  • the turbulence generator 8 is preferably a turbulence insert 12 having a plurality of turbulence channels 13, which are formed in particular by turbulence tubes 14.
  • a plurality of fins 15 are arranged in the embodiment of the headbox 1 according to FIG.
  • the lamellae 15 are preferably articulated between each row of turbulence channels 13 and have different lamellae lengths L LD so that they can end within the headbox nozzle 9 (FIG. 1), in the region of the outlet gap 10 or outside the headbox nozzle 9.
  • a plurality of vertical slats 16 are now provided, which are pivotally connected to the upstream module 4 (dilution device) via a preferably hinge-like holder 17.
  • the lamellae 16 preferably have a stiffness s of at least 5 Nm, preferably of at least 10 Nm, for at least 7/10 of their length L L.
  • FIG. 2 shows a partial plan view of the machine-wide intermediate chamber 7 together with adjoining assemblies, namely the dilution device 4 and the indicated turbulence generator 8.
  • the holder 17 is arranged between two units of the upstream module 4 (dilution device) and it is segmented or formed through the continuous hinge 18, in whose leadership at least one preferably provided at the respective upstream end of the fin 19 calotte, circular segment or ball-like element 20 engages.
  • the lamellae 16 have a pitch T L which is less than or equal to 100 mm, preferably less than or equal to 70 mm, and further have a length L L which is in the range of 2 to 10 times the pitch T L of the lamellae 16 is located.
  • the pitch T L of the fins 16 is equal to the pitch T V of the upstream subassembly 4 (diluter). So that the hydraulic coupling of the partial mixing streams is optimally given, the lamellae 16 advantageously have a stiffness s of at least 5 Nm, preferably of at least 10 Nm, for at least 7/10 of their length L L.
  • the fins 16 may of course also have a pitch T L , which is a multiple of the pitch T V of the upstream assembly 4 (dilution device).
  • downstream lamella ends 21 are provided between the downstream lamella ends 21 and the downstream turbulence generator 8, a distance A T smaller / equal to 300 mm, preferably less than or equal to 100, is provided.
  • the downstream fin ends 21 also have a fluidically optimal end contour 22.
  • FIG. 2 shows two preferred embodiments of the mixing chambers 5 arranged in the dilution device 4.
  • the mixing chambers 5 each have a flow channel 23, the lateral wall plates 24 of which are formed at least in regions as structural plates 25 which have a turbulence-generating corrugated surface structure 26
  • the mixing chambers 5 each have a flow channel 27 with at least one Carnot jump 28.
  • the mixing chambers 5 arranged in the dilution device 4 could each have a flow channel with at least one throttle exhibit.
  • the former type of mixing chamber 5 is for example from the European Patent EP 0 708 201 B1 known.
  • FIG. 3 now shows a schematic side view of a headbox 1 for a machine for producing a fibrous web.
  • the illustrated headbox 1 has in principle the basic structure of the headboxes 1 already described in FIGS. 1 and 2.
  • a straightening zone 29 is arranged between the thinning device 4 and the machine-width intermediate chamber 7, which comprises structures 30 for steering the respective partial mixing streams T M (arrow) in the machine direction L (arrow).
  • the upstream assembly is thus the straightening zone 29, on which the slats 16 are articulated via the brackets 17.
  • the lamellae 16 have to the bottom wall 31 and the ceiling wall 32, which limit the machine-width intermediate chamber 7, each having a distance A Z greater than 0.5 mm, preferably greater than 2 mm.
  • the respective distances A Z of a lamella 16 to the corresponding wall 31, 32 may of course be different. Also, the distances A Z in machine direction L (arrow) can increase.
  • FIG. 4 shows a further partial plan view of the machine-width intermediate chamber 7 together with adjacent assemblies of FIG. 3.
  • the structures 30 for steering the respective partial mixing streams T M (arrow) in the machine direction L (arrow) comprises.
  • the fins 16 are connected via the brackets 17 with the straightening zone 29 articulated.
  • a headbox of the type mentioned above is created by the invention, the turbulent mixing effects significantly reduced at least between adjacent partial mixing streams in the region of their flow from the dilution device to the machine-width intermediate chamber, and even completely avoids.

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  • Paper (AREA)
EP06112919A 2005-06-13 2006-04-21 Caisse de tête d'une machine de fabrication d' une bande fibreuse, en particulier une bande de papier ou de carton Withdrawn EP1734178A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510027354 DE102005027354A1 (de) 2005-06-13 2005-06-13 Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn, insbesondere einer Papier- oder Kartonbahn

Publications (1)

Publication Number Publication Date
EP1734178A1 true EP1734178A1 (fr) 2006-12-20

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EP06112919A Withdrawn EP1734178A1 (fr) 2005-06-13 2006-04-21 Caisse de tête d'une machine de fabrication d' une bande fibreuse, en particulier une bande de papier ou de carton

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EP (1) EP1734178A1 (fr)
DE (1) DE102005027354A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170081802A1 (en) * 2012-02-16 2017-03-23 International Paper Company Methods and apparatus for forming fluff pulp sheets

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101392470B (zh) * 2008-10-23 2011-04-27 华南理工大学 一种流浆箱混合平衡室的分隔控制装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4237310A1 (en) * 1992-11-05 1993-04-08 Voith Gmbh J M Paper-making stock inlet - has setting vanes in at least one chamber to modify the flow line for fibre orientation
US5985099A (en) * 1995-05-02 1999-11-16 Allimand (Societe Anonyme) Paper-making machine headbox with partial partitions
EP1496150A1 (fr) * 2003-07-09 2005-01-12 Voith Paper Patent GmbH Caisse de tête
EP1659214A1 (fr) * 2004-11-19 2006-05-24 Voith Paper Patent GmbH Caisse de tête d'une machine pour fabriquer une bande fibreuse

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4237310A1 (en) * 1992-11-05 1993-04-08 Voith Gmbh J M Paper-making stock inlet - has setting vanes in at least one chamber to modify the flow line for fibre orientation
US5985099A (en) * 1995-05-02 1999-11-16 Allimand (Societe Anonyme) Paper-making machine headbox with partial partitions
EP1496150A1 (fr) * 2003-07-09 2005-01-12 Voith Paper Patent GmbH Caisse de tête
EP1659214A1 (fr) * 2004-11-19 2006-05-24 Voith Paper Patent GmbH Caisse de tête d'une machine pour fabriquer une bande fibreuse

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170081802A1 (en) * 2012-02-16 2017-03-23 International Paper Company Methods and apparatus for forming fluff pulp sheets

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DE102005027354A1 (de) 2006-12-14

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