EP0708201A1 - Caisse de tête d'une machine à papier - Google Patents

Caisse de tête d'une machine à papier Download PDF

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Publication number
EP0708201A1
EP0708201A1 EP95114603A EP95114603A EP0708201A1 EP 0708201 A1 EP0708201 A1 EP 0708201A1 EP 95114603 A EP95114603 A EP 95114603A EP 95114603 A EP95114603 A EP 95114603A EP 0708201 A1 EP0708201 A1 EP 0708201A1
Authority
EP
European Patent Office
Prior art keywords
channels
headbox according
headbox
turbulence
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
EP95114603A
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German (de)
English (en)
Other versions
EP0708201B1 (fr
Inventor
Helmut Heinzmann
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
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Publication date
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Publication of EP0708201A1 publication Critical patent/EP0708201A1/fr
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Publication of EP0708201B1 publication Critical patent/EP0708201B1/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
    • D21F1/022—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
    • D21F1/08—Regulating consistency

Definitions

  • the invention relates to a headbox of a paper machine.
  • the pulp suspension for papermaking contains long fibers which tend to form flakes, which results in changes in density in the resulting paper web; In addition, the long fibers tend to align in the direction of flow, so that the paper web produced has different tensile strengths in the longitudinal and transverse directions. Flawless dispersion of the fibers can be achieved by using a turbulent flow.
  • headboxes with turbulence inserts of different designs are used.
  • US 4,504,360 describes a headbox with a turbulence insert.
  • the turbulence insert essentially consists of plates of different thicknesses which run across the machine width between the cover plate and the bottom plate of the headbox.
  • the thinning and thickening of the plates and the surfaces of the top and bottom plates are designed in such a way that the flow cross-section in the channel of the headbox in question is steadily reduced and is the same across the machine width, so that a constant acceleration or deceleration of the stock suspension is effected .
  • the aim is to dissolve the flakes present in the stock suspension.
  • DE-OS 15 61 686 describes a headbox for a paper machine with flow chambers, the boundary walls of which run discontinuously for the purpose of generating turbulence.
  • This publication also shows an embodiment with a plurality of channels, and also with trip hazards which are provided in the flow path for generating turbulence. these embodiments have not proven to be effective.
  • JP 5-13 28 85 (A) describes a headbox with a flow channel, the flow desk edge surfaces of which run discontinuously for the purpose of generating turbulence. This embodiment has also not been satisfactory in practice.
  • US 5,030,326 shows and describes a headbox with a turbulence insert of the usual type.
  • this turbulence insert has a multiplicity of channels which are circular in cross section.
  • the last area of the outlet is also provided with turbulence generating devices, namely with corrugated partitions.
  • these partitions are not comparable to classic turbulence; they are too far downstream on the flow path to still have the necessary effect.
  • the object of the invention is to provide a headbox for a paper machine with which the dispersion of the paper fibers is improved and the mechanical properties of a paper web produced are as small as possible with respect to the transverse or longitudinal direction exhibit. Furthermore, there should be the possibility of adjusting to different paper machine speeds and stock suspension properties in a simple manner, the setting options being to be different across the machine width.
  • the channel width and thus the cross section of the individual channel can be changed.
  • the cross-section can be changed, for example, by plates which can be displaced relative to one another, in particular if these plates have a corrugated surface structure, so that when they are displaced lengthwise or transversely to the direction of flow, alternating sections result in different acceleration and deceleration or turbulence.
  • the degree of turbulence but on the other hand also a change in the throughput can be set.
  • an individual adjustment of the channels is also possible, so that a sectional influencing of the throughput or the degree of turbulence is also possible, whereby a targeted adjustment of the basis weight cross profile and the fiber orientation cross profile is made possible.
  • the plurality of channels described above is provided individually or to be connected in blocks directly to a large number of upstream mixing valves, each of which is fed by at least two different material suspension flows. It is particularly advantageous here to use mixing valves which emit the same total flows at different mixing ratios, as is shown, for example, in DE 42 11 291.
  • the possible design of the surface of the channels corresponds to the designs of valves according to DE 42 39 643.
  • Figure 8 shows a longitudinal section through the schematic structure of a conventional headbox with the four areas of material feed I, prechamber II, turbulence area III and run-out area IV.
  • the material feed is in the form of a paraboloid-shaped transverse distribution pipe, from which the stock suspension is introduced into antechambers and is then led to the outlet area via a turbulence insert consisting of many tubular channels.
  • FIG. 8 A further development of the headbox shown in FIG. 8 is shown in FIG.
  • the material feed is carried out via a plurality of mixers Ia and a downstream diffuser Ib to the pre-chamber II.
  • the pre-chamber II is followed by the conventional structure of a headbox with turbulence area III and outlet area IV.
  • FIG. 1 shows a headbox with a configuration according to the first aspect of the invention, according to which a conventional headbox — with respect to stock feed I, prechamber II and outlet area IV — is equipped with a turbulence area III according to the first aspect of the invention.
  • the turbulence region shown consists of a plurality of channels which are elongate transversely to the direction of flow and which are adjustable in their cross section.
  • FIGS. 4-6 each of which shows the section A-A through the turbulence region III.
  • the cross sections of the channels it is also possible according to the invention for the cross sections of the channels to be individual adjust so that a sectional regulation of the degree of turbulence and the throughput is possible. If, in this case, an aperture setting is also provided at the outlet area, this embodiment already provides the best possible adaptation to different throughputs and, at the same time, the possibility of influencing the cross profile of the paper web produced with regard to weight, fiber orientation and by influencing the degree of turbulence also with regard to the fluffiness of the paper web produced .
  • FIG. 2 shows a further development of the inventive concept, in which, in contrast to the embodiment in FIG. 1, the area I of the headbox supplying the suspension consists of a large number of mixers, into each of which two suspension streams Q H and Q L are fed, which combine to form sectional overall flows .
  • the area I of the headbox supplying the suspension consists of a large number of mixers, into each of which two suspension streams Q H and Q L are fed, which combine to form sectional overall flows .
  • regulated stock suspension flows are fed to the mixers, which in turn lead to sectionally adjustable volume flows with adjustable density and / or sectional total volume flow; on the other hand, due to the use of adjustable cross-sections in the turbulence area II, there is an optimal adaptation to different stock suspension throughputs through the headbox and thus to a wide range of paper thicknesses or machine speeds to be produced.
  • each mixer influences a "packet" of channels and thus also affects the consistency or amount of suspension in the corresponding section.
  • the assignment can relate both horizontally and vertically arranged packages, or both combined, so that both individual sections - based on the width - and individual layers - based on the height of the material jet - can be influenced.
  • FIG. 3 shows a more constructive design of the headbox, in which the elements shown in FIG. 2 are integrated in a stabilizing housing, which can result in advantages with regard to the stability of the headbox.
  • FIG. 7 shows a further embodiment in a perspective section of the turbulence area III according to the invention of a headbox.
  • the direction of flow of the stock suspension is shown by the arrow S.
  • the turbulence area of the headbox is machine-wide divided into sections with a section width B S by partitions T, these partitions T extending from the top to the bottom structural plate S and can simultaneously serve as a tie rod between these plates.
  • the structure plates are each provided on the side facing the suspension with surface structures that create turbulence in the material suspension flowing past.

Landscapes

  • Paper (AREA)
  • Crushing And Grinding (AREA)
  • Sewing Machines And Sewing (AREA)
EP95114603A 1994-09-20 1995-09-16 Caisse de tête d'une machine à papier Expired - Lifetime EP0708201B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4433445 1994-09-20
DE4433445A DE4433445C1 (de) 1994-09-20 1994-09-20 Stoffauflauf einer Papiermaschine

Publications (2)

Publication Number Publication Date
EP0708201A1 true EP0708201A1 (fr) 1996-04-24
EP0708201B1 EP0708201B1 (fr) 2003-01-02

Family

ID=6528661

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95114603A Expired - Lifetime EP0708201B1 (fr) 1994-09-20 1995-09-16 Caisse de tête d'une machine à papier

Country Status (6)

Country Link
US (1) US5741401A (fr)
EP (1) EP0708201B1 (fr)
AT (1) ATE230453T1 (fr)
CA (1) CA2158677A1 (fr)
DE (2) DE4433445C1 (fr)
FI (1) FI113553B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19937302A1 (de) * 1999-08-10 2001-02-15 Voith Paper Patent Gmbh Stoffauflauf
EP1452640A2 (fr) * 2003-02-27 2004-09-01 Voith Paper Patent GmbH Caisse de tête
EP1659210A1 (fr) * 2004-11-19 2006-05-24 Voith Paper Patent GmbH Caisse de tête d'une machine pour fabriquer une bande fibreuse, en particulier une bande de papier ou de carton

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6264796B1 (en) 1999-07-13 2001-07-24 The Mead Corporation Headbox diffuser

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3216892A (en) * 1962-04-12 1965-11-09 Karlstad Mekaniska Ab Headbox for paper machine
DE1561686A1 (de) 1966-09-01 1969-12-11 St Annes Board Mill Co Ltd Stoffauflauf fuer eine Papier-,Pappen- oder aehnliche Faserbahnherstellungsmaschine
US4504360A (en) 1981-07-31 1985-03-12 Mitsubishi Jukogyo Kabushiki Kaisha A headbox in a paper-making machine having a flow rectifier
EP0211607A2 (fr) * 1985-07-30 1987-02-25 Seishi Gijutsu Kenkyu Kumiai Caisse de tête pour une machine à papier
US5030326A (en) 1988-05-13 1991-07-09 S.E.M.T.I. Societe A Responsabilite Limitee Paste-like mixture feed device
DE4239643A1 (en) 1992-11-26 1993-04-08 Voith Gmbh J M Fluid flow throttle for a paper-making machine - uses flexible hose in pressure box between two pipes
JPH05132885A (ja) 1991-11-12 1993-05-28 Mitsubishi Heavy Ind Ltd 抄紙機のヘツドボツクス
DE4211291A1 (de) 1992-04-03 1993-10-07 Voith Gmbh J M Mischeinrichtung zum Mischen von zwei Flüssigkeiten bei konstantem Gemischvolumenstrom zur Versorgung des Stoffauflaufs einer Papiermaschine
EP0631011A1 (fr) * 1993-06-03 1994-12-28 Hans-Joachim Dr. Schultz Caisse de tête pour une machine à papier

Family Cites Families (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE370422C (de) * 1923-03-02 Max Wenzel Vorrichtung zum Erzielen einer guten Durchmischung des Stoffwassers und vermehrter Querlagerung von Fasern an Langsiebpapiermaschinen mit am Stoffkasten angeordneter Stoffauslassduese
US3514372A (en) * 1966-11-29 1970-05-26 Beloit Corp Headbox method and means for blending of multiple jets
DE1941424C3 (de) * 1969-08-14 1980-07-10 Escher Wyss Gmbh, 7980 Ravensburg Stoffauflauf für eine Papiermaschine
US3652392A (en) * 1969-11-24 1972-03-28 Kimberly Clark Co Contracting pre-slice flow distributor for papermaking machine headbox
US3661605A (en) * 1970-06-08 1972-05-09 American Home Prod Release product
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
US3791918A (en) * 1972-03-08 1974-02-12 Valmet Oy Headbox of a paper making machine having multiple, vertically inclined vanes
US3939037A (en) * 1973-03-27 1976-02-17 Beloit Corporation Headbox with flexible trailing elements
AT331631B (de) * 1973-07-13 1976-08-25 Voith Gmbh J M Stoffauflauf fur papiermaschinen u.dgl.
FI56987C (fi) * 1976-08-20 1980-05-12 Valmet Oy System foer stabilisering av massasuspensionstroemmen i en hydraulisk inloppslaoda i en pappersmaskin
US4133713A (en) * 1977-10-11 1979-01-09 The Procter & Gamble Company Microturbulence generator for papermachine headbox
DE2942966C2 (de) * 1979-10-24 1984-04-26 J.M. Voith Gmbh, 7920 Heidenheim Stoffauflaufdüse
SE446889B (sv) * 1980-08-05 1986-10-13 Mitsubishi Heavy Ind Ltd Inloppslada vid en pappersmaskin
JPS602792A (ja) * 1983-06-20 1985-01-09 三菱重工業株式会社 抄紙機のヘツドボツクス
US4566945A (en) * 1984-04-11 1986-01-28 Beloit Corporation Headbox trailing element
DE3514554C3 (de) * 1984-09-19 1998-01-08 Escher Wyss Gmbh Stoffauflauf-Vorrichtung für eine Papiermaschine und Verfahren zu deren Betrieb
US4687548A (en) * 1984-10-31 1987-08-18 Valmet Oy Method and apparatus for controlling distortion of fibre orientation in a paper web
US4604164A (en) * 1985-01-30 1986-08-05 Mitsubishi Jukogyo Kabushiki Kaisha Flow restraining elements in the headbox of a paper machine
DE3535849A1 (de) * 1985-10-08 1987-04-09 Voith Gmbh J M Stellvorrichtung fuer eine lippe eines papiermaschinen-stoffauflaufs
FI79363C (fi) * 1988-09-26 1989-12-11 Valmet Paper Machinery Inc Foerfarande och anordning i inloppslaodan av en pappersmaskin foer att behaerska foerdelningen i pappersbanans fiberorientering.
FI82085C (fi) * 1989-06-02 1991-01-10 Valmet Paper Machinery Inc Turbulensgenerator i inloppslaodan av en pappersmaskin.
US5030360A (en) * 1989-09-13 1991-07-09 Murray Grainger Liquid-laden asbestos compactor and method for removing liquids from asbestos
DE4019593C2 (de) * 1990-06-20 1994-01-20 Voith Gmbh J M Stoffauflauf für Papiermaschinen
US5183537A (en) * 1991-10-07 1993-02-02 Beloit Technologies, Inc. Headbox tube bank apparatus and method of directing flow therethrough
DE4239644C2 (de) * 1992-11-26 1994-10-27 Voith Gmbh J M Stoffauflauf einer Papiermaschine mit Welleneinsatz

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3216892A (en) * 1962-04-12 1965-11-09 Karlstad Mekaniska Ab Headbox for paper machine
DE1561686A1 (de) 1966-09-01 1969-12-11 St Annes Board Mill Co Ltd Stoffauflauf fuer eine Papier-,Pappen- oder aehnliche Faserbahnherstellungsmaschine
US4504360A (en) 1981-07-31 1985-03-12 Mitsubishi Jukogyo Kabushiki Kaisha A headbox in a paper-making machine having a flow rectifier
EP0211607A2 (fr) * 1985-07-30 1987-02-25 Seishi Gijutsu Kenkyu Kumiai Caisse de tête pour une machine à papier
US5030326A (en) 1988-05-13 1991-07-09 S.E.M.T.I. Societe A Responsabilite Limitee Paste-like mixture feed device
JPH05132885A (ja) 1991-11-12 1993-05-28 Mitsubishi Heavy Ind Ltd 抄紙機のヘツドボツクス
DE4211291A1 (de) 1992-04-03 1993-10-07 Voith Gmbh J M Mischeinrichtung zum Mischen von zwei Flüssigkeiten bei konstantem Gemischvolumenstrom zur Versorgung des Stoffauflaufs einer Papiermaschine
DE4239643A1 (en) 1992-11-26 1993-04-08 Voith Gmbh J M Fluid flow throttle for a paper-making machine - uses flexible hose in pressure box between two pipes
EP0631011A1 (fr) * 1993-06-03 1994-12-28 Hans-Joachim Dr. Schultz Caisse de tête pour une machine à papier

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19937302A1 (de) * 1999-08-10 2001-02-15 Voith Paper Patent Gmbh Stoffauflauf
EP1452640A2 (fr) * 2003-02-27 2004-09-01 Voith Paper Patent GmbH Caisse de tête
EP1452640A3 (fr) * 2003-02-27 2004-11-17 Voith Paper Patent GmbH Caisse de tête
EP1659210A1 (fr) * 2004-11-19 2006-05-24 Voith Paper Patent GmbH Caisse de tête d'une machine pour fabriquer une bande fibreuse, en particulier une bande de papier ou de carton

Also Published As

Publication number Publication date
ATE230453T1 (de) 2003-01-15
FI954413A0 (fi) 1995-09-19
FI954413A (fi) 1996-03-21
DE59510520D1 (de) 2003-02-06
FI113553B (fi) 2004-05-14
DE4433445C1 (de) 1996-03-28
US5741401A (en) 1998-04-21
CA2158677A1 (fr) 1996-03-21
EP0708201B1 (fr) 2003-01-02

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