EP0812951A2 - Procédé et caisse de tête pour une machine à papier - Google Patents

Procédé et caisse de tête pour une machine à papier Download PDF

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Publication number
EP0812951A2
EP0812951A2 EP97106692A EP97106692A EP0812951A2 EP 0812951 A2 EP0812951 A2 EP 0812951A2 EP 97106692 A EP97106692 A EP 97106692A EP 97106692 A EP97106692 A EP 97106692A EP 0812951 A2 EP0812951 A2 EP 0812951A2
Authority
EP
European Patent Office
Prior art keywords
flow
flow elements
headbox
elements
headbox according
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
EP97106692A
Other languages
German (de)
English (en)
Other versions
EP0812951B1 (fr
EP0812951A3 (fr
Inventor
Helmut Heinzmann
Wolfgang Ruf
Helmut Sterz
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
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 filed Critical Voith Sulzer Papiermaschinen GmbH
Publication of EP0812951A2 publication Critical patent/EP0812951A2/fr
Publication of EP0812951A3 publication Critical patent/EP0812951A3/fr
Application granted granted Critical
Publication of EP0812951B1 publication Critical patent/EP0812951B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D21F1/026—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
    • D21F1/02—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
    • D21F1/028—Details of the nozzle section

Definitions

  • the invention relates to a method and a headbox for a paper machine.
  • the invention relates to a headbox with internals for producing or influencing the turbulence in the flow.
  • Document (5) describes a headbox in which the downstream ends do not extend into the area of the outlet gap.
  • Document (6) describes a headbox in which the surfaces of the flow elements can be changed, specifically with regard to their position in the headbox.
  • All previously known headboxes which have elements for influencing the turbulence within the flow chamber have a serious disadvantage: it is not possible to influence the flow conditions, in particular the turbulence, during operation. Every headbox has a very specific, unchangeable characteristic. This is disadvantageous because numerous operating parameters are subject to constant change during operation. Here are e.g. to name the substance composition, the temperature or the flow rate.
  • the invention has for its object to provide a method and a headbox that is designed such that during operation can be influenced in a variable manner on the hydraulics of the stock suspension, especially on the degree of turbulence.
  • the inventors have recognized that even the change in the size of the surfaces in contact with the flow have a very considerable effect on the flow hydraulics, and thus not only the shape of the inserts located in the flow chamber.
  • Document (4) shows and describes a multi-layer headbox with a nozzle-like outlet channel, which is divided into three individual channels.
  • the individual channels are delimited from one another by tongues which can be moved in the direction of flow. Moving this tongue, however, does not serve to enlarge the areas in contact with the flow, but rather to adjust the width of the outlet gap of the individual channel.
  • the headbox shown in FIG. 1 comprises a flow chamber 1. This has an inlet 2.
  • the flow chamber 1 is followed by an outlet nozzle 3.
  • the flow chamber 1 contains a bundle of a plurality of tubes 1.1. These run in the direction of flow. They are used to produce microturbulence in the stock suspension in a known manner.
  • the outlet nozzle 3 has outer boundary walls 3.1 and 3.2, which together form an outlet gap 3.3 at their downstream end.
  • FIG. 2 again shows the two boundary walls 3.1 and 3.2 with the outlet gap 3.3.
  • FIG. 2 again shows the two boundary walls 3.1 and 3.2 with the outlet gap 3.3.
  • pockets in which flow elements according to the invention are stored As can be seen from FIG. 2, three rows of pockets with associated flow elements are arranged one above the other. This is an upper row of pockets 3.4 with associated flow elements 3.41, a middle row of pockets 3.5 with associated flow elements 3.51 and a lower row of pockets 3.6 with associated flow elements 3.61.
  • the flow elements are round rods in the present case. They can be moved in and out in the direction of flow, which is illustrated in FIG. 3 by the double arrow.
  • the outlet nozzle 3 is designed in a completely different way.
  • the stock suspension is led through a plurality of channels 5.1, 5.2, 5.3 to the outlet gap 3.3.
  • the channels are drilled through massive blocks 6.1, 6.2, 6.3.
  • the boundary walls 3.1, 3.2 are located in the downstream end region of the outlet nozzle 3 and are stationary.
  • flow elements 3.71 and 3.81 are plate-shaped. They extend across the entire working width. They are in turn stored in pockets 3.7 and 3.8. They can also be moved in the flow direction, just like the round rods according to FIGS. 2 and 3, so that the size of the surface of these flow elements 3.71, 3.81 in contact with the flow can be changed.
  • a particularly interesting embodiment can result from the fact that the flow elements - and rods or plates - seen in the direction of displacement - have areas of different roughness.
  • a downstream part may have a particularly low roughness, while the roughness increases when viewed upstream. This progressively increases the effect of extending the individual flow elements.
  • the turbulence-generating element 3.41 protrudes beyond the outlet gaps 3.31 and 3.32.
  • the flow element 3.41 generates additional turbulence due to the boundary layer friction with the fiber suspension (not shown), which has already emerged from the nozzle 3.
  • the widths of the outlet gaps 3.31 and 3.41 remain constant. The same applies accordingly if the flow elements only move within the nozzle. In this way, the degree of turbulence in the suspension can be adjusted without changing the outflow quantity of the suspension.
  • FIG. 6 A variant of FIG. 5 can be seen in FIG. 6. Instead of just one flow element, there are two flow elements here (but there are also other conceivable ones).
  • the course of the flow elements 3.41 and 3.51 is arranged within the nozzle 3 in a converging manner. So that the widths of the outlet gaps 3.31, 3.32 and 3.33 do not change when adjusting the flow elements 3.41 and 3.51, it is necessary that the flow elements 3.41 and 3.51 are elastic and parallel to one another in the course of the outlet openings.
  • This parallel alignment is created by deliberately influencing the pressure of the partial flows in the nozzle 3 and the dimensioning of the bending stress in the flow elements 3.41 and 3.51.
  • FIGS. 5 and 6 can be both flat and rod-shaped.

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  • Paper (AREA)
EP97106692A 1996-05-25 1997-04-23 Procédé et caisse de tête pour une machine à papier Expired - Lifetime EP0812951B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19621258A DE19621258C1 (de) 1996-05-25 1996-05-25 Stoffauflauf für eine Papiermaschine
DE19621258 1996-05-25

Publications (3)

Publication Number Publication Date
EP0812951A2 true EP0812951A2 (fr) 1997-12-17
EP0812951A3 EP0812951A3 (fr) 1998-04-01
EP0812951B1 EP0812951B1 (fr) 2003-11-05

Family

ID=7795408

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97106692A Expired - Lifetime EP0812951B1 (fr) 1996-05-25 1997-04-23 Procédé et caisse de tête pour une machine à papier

Country Status (3)

Country Link
EP (1) EP0812951B1 (fr)
CA (1) CA2206023A1 (fr)
DE (2) DE19621258C1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19908973A1 (de) * 1999-03-02 2000-09-07 Voith Sulzer Papiertech Patent Verfahren zur Regelung des Reißlängenverhältnisses einer erzeugten Papierbahn und Papiermaschine
DE10324711A1 (de) * 2003-05-30 2004-12-30 Voith Paper Patent Gmbh Stoffauflauf

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4133713A (en) * 1977-10-11 1979-01-09 The Procter & Gamble Company Microturbulence generator for papermachine headbox
EP0300288A1 (fr) * 1987-07-18 1989-01-25 Neue Bruderhaus Maschinenfabrik GmbH Elément traînant pour la caisse de tête d'une machine à papier
EP0526259A1 (fr) * 1991-06-21 1993-02-03 Kimberly-Clark Corporation Lèvre flexible, allongée d'une caisse de tête
US5277765A (en) * 1992-06-18 1994-01-11 Voith, Inc. Headbox with a vertical partition between perforated rolls
WO1994020678A1 (fr) * 1993-03-06 1994-09-15 J.M. Voith Gmbh Systeme permettant d'influer sur la vitesse de jet dans une caisse de tete pour application de plusieurs couches

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3514372A (en) * 1966-11-29 1970-05-26 Beloit Corp Headbox method and means for blending of multiple jets
AT305754B (de) * 1970-02-18 1973-03-12 Voith Gmbh J M Stoffauflauf für Papiermaschinen
US3843470A (en) * 1970-08-31 1974-10-22 Beloit Corp Flexible trailing elements in a paper-making machine headbox having projections thereon extending into the slurry flow
DE3227218C2 (de) * 1982-07-21 1984-10-18 Escher Wyss Gmbh, 7980 Ravensburg Mehrlagenstoffauflauf
DE4321697C2 (de) * 1993-06-30 2002-05-23 Voith Paper Patent Gmbh Turbulenzeinsatz einer Papiermaschine
DE4402625A1 (de) * 1994-01-31 1994-06-09 Voith Gmbh J M Strömungsleitvorrichtung für den Stoffauflauf einer Papiermaschine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4133713A (en) * 1977-10-11 1979-01-09 The Procter & Gamble Company Microturbulence generator for papermachine headbox
EP0300288A1 (fr) * 1987-07-18 1989-01-25 Neue Bruderhaus Maschinenfabrik GmbH Elément traînant pour la caisse de tête d'une machine à papier
EP0526259A1 (fr) * 1991-06-21 1993-02-03 Kimberly-Clark Corporation Lèvre flexible, allongée d'une caisse de tête
US5277765A (en) * 1992-06-18 1994-01-11 Voith, Inc. Headbox with a vertical partition between perforated rolls
WO1994020678A1 (fr) * 1993-03-06 1994-09-15 J.M. Voith Gmbh Systeme permettant d'influer sur la vitesse de jet dans une caisse de tete pour application de plusieurs couches

Also Published As

Publication number Publication date
CA2206023A1 (fr) 1997-11-25
EP0812951B1 (fr) 2003-11-05
EP0812951A3 (fr) 1998-04-01
DE59710938D1 (de) 2003-12-11
DE19621258C1 (de) 1997-10-16

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