EP0581051A1 - Caisse de tête à plusieurs couches pour une machine à papier ou analogue - Google Patents

Caisse de tête à plusieurs couches pour une machine à papier ou analogue Download PDF

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Publication number
EP0581051A1
EP0581051A1 EP93110643A EP93110643A EP0581051A1 EP 0581051 A1 EP0581051 A1 EP 0581051A1 EP 93110643 A EP93110643 A EP 93110643A EP 93110643 A EP93110643 A EP 93110643A EP 0581051 A1 EP0581051 A1 EP 0581051A1
Authority
EP
European Patent Office
Prior art keywords
headbox
channels
headbox according
channel
degrees
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
EP93110643A
Other languages
German (de)
English (en)
Other versions
EP0581051B1 (fr
Inventor
Alfred Dr. Bubik
Klaus Lehleiter
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 Sulzer Papiermaschinen GmbH
Original Assignee
Sulzer Escher Wyss GmbH
Escher Wyss GmbH
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 Sulzer Escher Wyss GmbH, Escher Wyss GmbH, Voith Sulzer Papiermaschinen GmbH filed Critical Sulzer Escher Wyss GmbH
Publication of EP0581051A1 publication Critical patent/EP0581051A1/fr
Application granted granted Critical
Publication of EP0581051B1 publication Critical patent/EP0581051B1/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
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
    • D21F9/006—Complete machines for making continuous webs of paper of the twin-wire type paper or board consisting of two or more layers

Definitions

  • the invention relates to a headbox according to the preamble of claim 1.
  • headboxes are used to form a web on a paper machine or the like, which consists of at least three layers. It usually makes sense to produce the different layers with different properties. Such properties are e.g. the type or quality of fiber or other parameters such as consistency, fine material content or the like.
  • the headbox used for this has i.a. the task of generating a wide beam, which is then e.g. enters the forming area of a paper machine.
  • a pressure channel in the headbox also referred to as a nozzle space
  • pressure energy is converted into kinetic energy, i.e. the suspension is accelerated considerably.
  • the individual partial streams meet in the jet at a certain angle.
  • This angle mostly depends on the structural conditions of the headbox, e.g. the space required for the material feed / distribution and for adjustment devices.
  • the various partial streams of suspension are brought together in the jet, the partial streams lying further outward also have a velocity component perpendicular to the direction of an adjacent partial jet due to the angle. Because of these speed components, flow impulses arise in this transverse direction, which intensify the mixing of adjacent layers with one another. These Mixing is undesirable to the extent that occurs.
  • Such a multi-layer headbox is considerably more complex than a single-layer headbox both in production and in operation. The benefit of this effort is reduced if it is not possible to adequately separate the various partial streams in the sheet.
  • the partial flows in the headbox itself be guided as parallel as possible - that is to say at an acute angle. This makes it possible to keep the disruptive cross-speed component small, but on the other hand the headbox becomes even larger because it is longer and more complex.
  • the partial flows are already diverted in the headbox so that they can emerge approximately in parallel. This can lead to the formation of detachments and secondary flows in the pressure channels of the outer layers, where the deflection takes place, which are detrimental to the uniformity of the jet.
  • the stock suspensions in the channels will expediently differ in type and composition.
  • efforts are often made to use different fiber qualities in different layers of the paper produced.
  • the effect of the object of the invention in solving the problem can also be improved by the fact that the flow speed of adjacent partial flows is not the same.
  • exit gaps 4.4 ′′ of the outer channels 3.3 ′′ can be adjusted by means of screens 10.
  • guide surfaces At the end of partition walls 7 and 8 lying between two channels are guide surfaces which converge at an acute angle. Not absolutely necessary, but often helpful, they are designed as flexible separating lamellae 11. Such slats can partially reduce the undesired mixing of adjacent layers.
  • the parts of the paper machine or the like from which the pre-formed multi-layer jet is received and dewatered to form a web are not shown.
  • the angle alpha, in which the channels 3, 3 ', 3''are relative to one another is chosen to be even more acute with 10 o .
  • This measure which is in itself advantageous for the operation of the headbox, cannot usually be carried out easily because of space problems.
  • a central surface can be defined as the geometric location of all points that are at the same distance from both boundary walls that form this channel.
  • the course of this surface approximately reflects the mean direction of flow. This is indicated here by arrows in a row.
  • the angle alpha is the one in which two adjacent middle flow directions, here the middle and the outer ones, are related to each other. The direction of flow within a channel is thus assumed to be the mean value between the boundary walls.
  • the distance A is drawn in, which is formed between the end of the boundary wall lying further outside and the end of the boundary wall lying further inside.
  • the flexible separating lamellae are not included in the measurement if the reversal of direction, as described in claim 2, should preferably take place on a fixed contour, which in this case is present on the inner boundary wall 7. Under certain conditions, however, the effect used by the invention can also be realized in the area of the separating lamella 11, which is then also taken into account for determining the dimension A (see FIG. 6).
  • Fig. 5 differs essentially from Fig. 4 in that the angle alpha, here with about 23 o , is steeper than that shown at 15 o in Fig. 3.
  • the entire headbox can thus be even more compact, ie shorter in the direction of travel.
  • the headbox according to the invention does not necessarily have to be directed horizontally, rather it is possible to arrange it so that it can generate an oblique suspension jet directed vertically upwards or vertically downwards.
  • the advantages can also be achieved with it.

Landscapes

  • Paper (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Materials For Medical Uses (AREA)
  • Sewing Machines And Sewing (AREA)
EP93110643A 1992-07-31 1993-07-03 Caisse de tête à plusieurs couches pour une machine à papier ou analogue Expired - Lifetime EP0581051B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4225297 1992-07-31
DE4225297A DE4225297C2 (de) 1992-07-31 1992-07-31 Stoffauflauf für eine Papiermaschine

Publications (2)

Publication Number Publication Date
EP0581051A1 true EP0581051A1 (fr) 1994-02-02
EP0581051B1 EP0581051B1 (fr) 1995-11-29

Family

ID=6464528

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93110643A Expired - Lifetime EP0581051B1 (fr) 1992-07-31 1993-07-03 Caisse de tête à plusieurs couches pour une machine à papier ou analogue

Country Status (6)

Country Link
US (1) US5431785A (fr)
EP (1) EP0581051B1 (fr)
AT (1) ATE130890T1 (fr)
CA (1) CA2101111A1 (fr)
DE (2) DE4225297C2 (fr)
FI (1) FI114556B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
EP1428930A1 (fr) * 2002-12-11 2004-06-16 Voith Paper Patent GmbH Procédé et caisse de tête induisant le cisaillement et la turbulence dans une suspension fibreuse
US6962646B2 (en) 2002-03-27 2005-11-08 Voith Paper Patent Gmbh Multi-layer headbox

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE501798C2 (sv) * 1993-09-13 1995-05-15 Valmet Karlstad Ab Flerskiktsinloppslåda
EP0681057B1 (fr) * 1994-04-29 2002-08-28 Voith Paper Patent GmbH Caisse de tête à plusieurs couches
US5882482A (en) * 1996-06-10 1999-03-16 Beloit Technologies, Inc. Convergent flow headbox
US6235159B1 (en) 1996-06-10 2001-05-22 Beloit Technologies, Inc. Convergent flow headbox
SE506931C2 (sv) † 1996-06-12 1998-03-02 Valmet Karlstad Ab Flerskiktsinloppslåda för en pappersmaskin
DE29701032U1 (de) * 1997-01-22 1997-03-13 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim 3-Schicht-Stoffauflauf
DE19718034A1 (de) * 1997-04-29 1998-11-05 Voith Sulzer Papiermasch Gmbh Stoffauflauf mit Dämpfungsverteiler
DE19806402A1 (de) * 1998-02-17 1999-08-19 Voith Sulzer Papiertech Patent Verfahren zum Zusammenführen zweier Suspensionsschichten sowie Eindickvorrichtung
US6248210B1 (en) 1998-11-13 2001-06-19 Fort James Corporation Method for maximizing water removal in a press nip
DE19930592A1 (de) * 1999-07-02 2001-01-11 Voith Paper Patent Gmbh Stoffauflauf
FI116470B (fi) * 1999-10-04 2005-11-30 Metso Paper Inc Menetelmä paperirainan muodostamiseksi
DE10208610B4 (de) * 2002-02-27 2014-03-06 Voith Patent Gmbh Verfahren zum Verteilen einer Faserstoffsuspension im Stoffauflauf einer Papier- oder Kartonmaschine und Stoffauflauf
DE10211178A1 (de) * 2002-03-14 2003-09-25 Voith Paper Patent Gmbh Stoffauflauf einer Paper- oder Kartonmaschine
DE10318035A1 (de) * 2003-04-19 2004-11-04 Voith Paper Patent Gmbh Stoffauflauf
US20070012414A1 (en) * 2005-07-12 2007-01-18 Kajander Richard E Multilayer nonwoven fibrous mats with good hiding properties, laminates and method
DE102019126296A1 (de) * 2019-09-30 2021-04-01 Voith Patent Gmbh Lamelle für einen Stoffauflauf und Verfahren zur Herstellung einer Lamelle

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4141788A (en) * 1978-05-02 1979-02-27 Beloit Corporation Method of and means for forming multi-ply paper webs from a single headbox
GB2093879A (en) * 1981-03-02 1982-09-08 Escher Wyss Gmbh Headboxes for paper machines
GB2094364A (en) * 1981-03-02 1982-09-15 Escher Wyss Gmbh Methods and apparatus for forming a multi-layered paper web
AT374843B (de) * 1982-07-23 1984-06-12 Escher Wyss Gmbh Mehrlagenstoffauflauf fuer insbesondere papiermaschinen
DE4029545A1 (de) * 1990-09-18 1992-03-19 Escher Wyss Gmbh Stoffauflauf-einrichtung

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3802966A (en) * 1969-08-22 1974-04-09 Ethyl Corp Apparatus for delivering a fluid suspension to a forming unit clear reactor power plant
FI58364C (fi) * 1977-07-13 1981-01-12 Tampella Oy Ab Matningsanordning foer en banformningsmaskin foer framstaellning av en tvao- eller flerskiktig fiberbana
AT378793B (de) * 1981-05-14 1985-09-25 Escher Wyss Gmbh Stoffauflaufvorrichtung fuer papiermaschinen
SE428810B (sv) * 1981-12-01 1983-07-25 Karlstad Mekaniska Ab Regelersystem for reglering av en flerskiktsinloppslada for en pappersmaskin
FI78750B (fi) * 1982-07-20 1989-05-31 Escher Wyss Gmbh Flerskiktsinloppslaoda foer matande av pappersmassa till en vira.
CH672515A5 (fr) * 1987-02-02 1989-11-30 Escher Wyss Gmbh
US5129988A (en) * 1991-06-21 1992-07-14 Kimberly-Clark Corporation Extended flexible headbox slice with parallel flexible lip extensions and extended internal dividers

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4141788A (en) * 1978-05-02 1979-02-27 Beloit Corporation Method of and means for forming multi-ply paper webs from a single headbox
GB2093879A (en) * 1981-03-02 1982-09-08 Escher Wyss Gmbh Headboxes for paper machines
GB2094364A (en) * 1981-03-02 1982-09-15 Escher Wyss Gmbh Methods and apparatus for forming a multi-layered paper web
AT374843B (de) * 1982-07-23 1984-06-12 Escher Wyss Gmbh Mehrlagenstoffauflauf fuer insbesondere papiermaschinen
DE4029545A1 (de) * 1990-09-18 1992-03-19 Escher Wyss Gmbh Stoffauflauf-einrichtung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US6962646B2 (en) 2002-03-27 2005-11-08 Voith Paper Patent Gmbh Multi-layer headbox
EP1428930A1 (fr) * 2002-12-11 2004-06-16 Voith Paper Patent GmbH Procédé et caisse de tête induisant le cisaillement et la turbulence dans une suspension fibreuse

Also Published As

Publication number Publication date
EP0581051B1 (fr) 1995-11-29
DE59301044D1 (de) 1996-01-11
FI933421A0 (fi) 1993-07-30
ATE130890T1 (de) 1995-12-15
CA2101111A1 (fr) 1994-02-01
FI933421A (fi) 1994-02-01
FI114556B (fi) 2004-11-15
DE4225297A1 (de) 1994-02-03
DE4225297C2 (de) 1996-11-28
US5431785A (en) 1995-07-11

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