EP1022378A3 - Headbox - Google Patents

Headbox Download PDF

Info

Publication number
EP1022378A3
EP1022378A3 EP99118677A EP99118677A EP1022378A3 EP 1022378 A3 EP1022378 A3 EP 1022378A3 EP 99118677 A EP99118677 A EP 99118677A EP 99118677 A EP99118677 A EP 99118677A EP 1022378 A3 EP1022378 A3 EP 1022378A3
Authority
EP
European Patent Office
Prior art keywords
path section
section
length
path
flow
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
EP99118677A
Other languages
German (de)
French (fr)
Other versions
EP1022378B1 (en
EP1022378A2 (en
Inventor
Alfred Dr. Bubik
Joachim Henssler
Jürgen Prössl
Karl Müller
Walter Dr. Holzer
Mathias Schwaner
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 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 Papiertechnik Patent GmbH filed Critical Voith Sulzer Papiertechnik Patent GmbH
Publication of EP1022378A2 publication Critical patent/EP1022378A2/en
Publication of EP1022378A3 publication Critical patent/EP1022378A3/en
Application granted granted Critical
Publication of EP1022378B1 publication Critical patent/EP1022378B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • D21F1/028—Details of the nozzle section

Landscapes

  • Paper (AREA)
  • Coating Apparatus (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Abstract

The stock inlet for a papermaking machine, with a pulp feed and a turbulence generator, has a path section (I) where the free cross section steadily decreases towards the outlet which is directly followed by a second path section (II) with a steady and continuous expansion to the outlet. The second path section (II) with a flow expansion can be followed by a third path section with a steady and decreasing free flow cross section. The third path section length L3 is shorter than the second (II) length L2, which is shorter than the length L1 of the first path section (I). The structure of the path lengths is expressed as L2<0.3> L3 L2<0.7> and L1<0.1> L2 L1<0.3>. The first path section (I) starts directly after the turbulence generator. The total crosssection of the stock inlet jet is formed by a single suspension flow channel (4) at least over part of the length of the stock inlet jet. Or a number of suspension flow channels are over at least part of the stock inlet jet length of the total cross section of the stock inlet jet, formed by at least one divider between the two limit walls. Without exception, all the suspension flow channels have the same cross section pattern, in a shape which covers each other. The rate of divergence at the second path section (II) is identical for all the suspension flow channels. The dividers form a point towards each other at the second path section (II), each with the same degree of convergence at the ends of their surfaces. The alignment of the upper (1) and/or lower (2) wall of the stock inlet, at least in the second path section (II), is in a mirror image to the line of the adjacent divider in relation to the surfaces in contact with the suspension flow. The turbulence generator has a number of diffusion tubes, arranged in rows across the machine width. The dividers start between the rows of diffusion tubes. The upper and lower walls of the stock inlet have the same length. The ratio of the change in the reducing cross section height in the flow direction to the flow path length in the first path section (I) is 0.3-40.0 % and preferably 10-30%. The ratio of the increasing cross section height in the flow direction to the flow path length in the second path section (II) is 0.1-20.0% and preferably 2-12%. The ratio of the change in the reducing crosssection height in the flow direction to the flow path length in the third path section is 1-400% and preferably 10-200%. The first path section (I) has a length of 250-1000 mm and preferably 400-800 mm. The second path section (II) has a length of 20-150 mm. The length of the third path section is 0.5-300.0 mm and preferably 1-100 mm. The smallest cross section height of the first path section (I) is 10-500 mm, and preferably 15-150 mm, and 30-200 mm at the second path section (II), and 5-80 mm in the third path section.
EP99118677A 1999-01-23 1999-09-22 Headbox Expired - Lifetime EP1022378B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19902623A DE19902623A1 (en) 1999-01-23 1999-01-23 Headbox
DE19902623 1999-01-23

Publications (3)

Publication Number Publication Date
EP1022378A2 EP1022378A2 (en) 2000-07-26
EP1022378A3 true EP1022378A3 (en) 2000-11-22
EP1022378B1 EP1022378B1 (en) 2003-12-17

Family

ID=7895180

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99118677A Expired - Lifetime EP1022378B1 (en) 1999-01-23 1999-09-22 Headbox

Country Status (4)

Country Link
US (1) US6372092B1 (en)
EP (1) EP1022378B1 (en)
AT (1) ATE256781T1 (en)
DE (2) DE19902623A1 (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10106684A1 (en) * 2001-02-14 2002-08-29 Voith Paper Patent Gmbh Slat of a headbox of a paper, cardboard or tissue machine
DE10256510A1 (en) * 2002-12-04 2004-06-24 Voith Paper Patent Gmbh Headbox of a paper or board machine for the production of a fibrous web
SE526405C2 (en) * 2004-01-16 2005-09-06 Metso Paper Inc Method and apparatus for cross-distributing a streaming medium
US7875192B2 (en) * 2006-12-20 2011-01-25 Carter Day International, Inc. Slurry flow divider
DE102008043145A1 (en) * 2008-10-24 2010-04-29 Voith Patent Gmbh Two-layer casserole for a machine for producing a two-layer fibrous web
EP2199459A1 (en) * 2008-12-16 2010-06-23 Voith Patent GmbH Sheet composition system for a machine for producing a multiple layer sheet of fibrous material
DE102009028389A1 (en) 2009-08-10 2011-02-17 Voith Patent Gmbh Headbox, sheet forming unit with a headbox and method of operating a sheet forming unit
DE102009028385A1 (en) 2009-08-10 2011-02-17 Voith Patent Gmbh Method for operating a sheet forming unit and sheet forming unit
DE102010001615A1 (en) 2010-02-05 2011-08-11 Voith Patent GmbH, 89522 Headbox and sheet forming unit with a headbox
DE102010001613A1 (en) 2010-02-05 2011-08-11 Voith Patent GmbH, 89522 Headbox and sheet forming unit with a headbox
DE102010001614A1 (en) 2010-02-05 2011-08-11 Voith Patent GmbH, 89522 Headbox and sheet forming unit with a headbox
DE102010001610A1 (en) 2010-02-05 2011-08-11 Voith Patent GmbH, 89522 Headbox and sheet forming unit with a headbox
MX2022014704A (en) * 2020-05-29 2023-01-30 Kimberly Clark Co Headbox for manufacturing a substrate.

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4005147A1 (en) * 1990-02-17 1991-08-29 Voith Gmbh J M Paper making stock inlet jet - delivers fibre suspension in a stream which opens out without micro-turbulence
US5599428A (en) * 1993-07-12 1997-02-04 J. M. Voith Gmbh Headbox nozzle with heavy end convergence

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3038538A (en) * 1958-05-28 1962-06-12 Kenneth C Logan Paper machine headbox
CA975597A (en) * 1972-06-20 1975-10-07 Ramamurthy G. Krishnan Headbox for paper machine
GB1431603A (en) * 1973-11-26 1976-04-14 Wiggins Teape Ltd Forming non-woven fibrous material
SE446889B (en) * 1980-08-05 1986-10-13 Mitsubishi Heavy Ind Ltd INPUT CHARGE ON A PAPER MACHINE
US4604164A (en) * 1985-01-30 1986-08-05 Mitsubishi Jukogyo Kabushiki Kaisha Flow restraining elements in the headbox of a paper machine
US4971659A (en) * 1990-01-29 1990-11-20 Hiroshi Takeuchi Head box with reducing stream gate
DE4239644C2 (en) * 1992-11-26 1994-10-27 Voith Gmbh J M Headbox of a paper machine with shaft insert
DE4307143C2 (en) * 1993-03-06 1998-02-05 Voith Gmbh J M Multi-layer headbox

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4005147A1 (en) * 1990-02-17 1991-08-29 Voith Gmbh J M Paper making stock inlet jet - delivers fibre suspension in a stream which opens out without micro-turbulence
US5599428A (en) * 1993-07-12 1997-02-04 J. M. Voith Gmbh Headbox nozzle with heavy end convergence

Also Published As

Publication number Publication date
DE19902623A1 (en) 2000-07-27
EP1022378B1 (en) 2003-12-17
ATE256781T1 (en) 2004-01-15
EP1022378A2 (en) 2000-07-26
US6372092B1 (en) 2002-04-16
DE59908101D1 (en) 2004-01-29

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