EP0631011A1 - Headbox for a papermaking machine - Google Patents

Headbox for a papermaking machine Download PDF

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Publication number
EP0631011A1
EP0631011A1 EP94108549A EP94108549A EP0631011A1 EP 0631011 A1 EP0631011 A1 EP 0631011A1 EP 94108549 A EP94108549 A EP 94108549A EP 94108549 A EP94108549 A EP 94108549A EP 0631011 A1 EP0631011 A1 EP 0631011A1
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EP
European Patent Office
Prior art keywords
module
forming unit
headbox
distributor
volume flow
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Granted
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EP94108549A
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German (de)
French (fr)
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EP0631011B1 (en
Inventor
Hans-Joachim Dr. Schultz
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Individual
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    • 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

Definitions

  • the invention relates to a headbox for the production of a paper machine including the distribution system supplying the stock suspension.
  • Such a headbox should set the stock density and fiber orientation profile of the paper stock suspension at the latest before the outlet gap in such a way that the basis weight and fiber orientation cross profile of the paper web corresponds to the desired requirements over the entire width, that is to say is generally constant.
  • disruptive factors include, for example, temperature fluctuations, pressure fluctuations, manufacturing tolerances or design-related irregularities in the headbox, which lead to problematic asymmetries in the paper.
  • a headbox which has a modular structure, the headbox consisting of a central distribution system and connected, individual modular forming units which distribute the stock suspension flatly.
  • Disadvantages of the headbox shown are, on the one hand, insufficient symmetry with regard to the suspension guidance and, on the other hand, the lack of precautions for the sectioned influencing of the suspension properties.
  • the object of the invention is to present a headbox which eliminates the disadvantages of the prior art and at the same time is structurally designed such that that relatively large headboxes can also be produced with small-scale processing machines.
  • each individual fraction of stock suspensions is treated as equally as possible with respect to the individual positions of the machine width, i.e. that the absolute symmetry also with respect to the "preexistence" of the stock suspension before it leaves the headbox makes a significant contribution to the uniformity of the paper across the machine width.
  • the possibility must also be given to carry out section-specific mixing of material suspensions with different properties, which of course also includes an influence on the material flow per section.
  • Figure 1 shows the forming unit of the headbox system according to the invention in a perspective view.
  • the illustration shows four rows of modules that are machine-wide in the running direction and structure of a modular forming unit.
  • Each row consists of a set of individual modules, which can be combined with one another in a meaningful manner, whereby of course - not shown in the figure - stacked combinations are also possible, which corresponds to a 3-dimensional modularity.
  • a connection piece system 1 is first seen, to which the transition piece 2 is connected, followed by a formation element 3, again followed by rectifiers 4 with the nozzle 5 connected to them.
  • Figure 2 shows different combinations of structural elements in the forming unit.
  • a connector can be seen under position 1, followed by position 2, a diffuser, followed by a formation element 3, followed by a rectifier 4, which in this case is also constructed as a partial diffuser, followed by a nozzle 5 with a straight upper and lower lip.
  • a rectifier 4 which in this case is also constructed as a partial diffuser, followed by a nozzle 5 with a straight upper and lower lip.
  • two different connection systems can be seen under 1 and 2, one with a 90 ° curvature or with a 45 ° connection, followed by a directly following, differently designed formation element, the also differently designed rectifier 4 and a subsequent one on both sides S -shaped material outlet nozzle 5.
  • Level C shows an extended extension 1 with a shortened intermediate piece 2, followed by an intermediate piece 3, which in the beginning consists of a pipe distribution grid with a subsequent formation element, then in part 4 a nozzle-like turbulence insert 4 with the Nozzle 5 connected thereto.
  • level D at position 3 there is alternatively shown a perforated roller insert which can be combined with any configuration of levels AC.
  • all elements of levels A-D at positions 1-5 can of course be combined in a meaningful way.
  • FIG. 3 shows a headbox system with the central distributor 1 according to the invention, which simultaneously functions as a damping element in the known sense.
  • the Material suspension is fed from the central distributor 1 to the connecting piece system of the forming unit 3 via flexible lines 2 attached to the central distributor.
  • the forming unit is constructed as described in FIGS. 1 and 2.
  • both central distributors deliver material suspensions of different qualities
  • the second central distributor is also connected to the connecting piece system via flexible lines either via a mixing valve, or an alternating connection of lines of the first and afterwards of the second central distributor is made in a mixing chamber.

Abstract

The invention relates to a headbox system of a paper machine having the following features: 1.1 a central distributor is provided for the uniform distribution of the stock suspension, having an integrated attenuation system; 1.2 a forming unit constructed modularly in rows is provided; 1.2.1 at least one module per row being provided as a line connecting module; 1.2.2 a nozzle module being provided in each case; 1.2.3 at least one intermediate module - for example a formation module, a turbulence module, a diffusor module, a rectifier module, a perforated roll module or any desired combinations of these - being provided; 1.2.4 the intermediate modules being provided symmetrically with respect to at least one plane in the machine direction; 1.2.5 the flange elements of the modules being provided to be compatible with each other; 1.3 a multiplicity of optionally flexible connecting lines between distributor and forming unit are provided. <IMAGE>

Description

Die Erfindung betrifft einen Stoffauflauf zur Herstellung einer Papiermaschine einschließlich des Stoffsuspension zuführenden Verteilungssystems.The invention relates to a headbox for the production of a paper machine including the distribution system supplying the stock suspension.

Ein solcher Stoffauflauf soll das Stoffdichte- und Faserorientierungsprofil der Papierstoffsuspension spätestens vor dem Auslaufspalt derart einstellen, daß das Flächengewichts- und Faserorientierungsquerprofil der Papierbahn über die gesamte Breite den gewünschten Anforderungen entspricht, das bedeutet in der Regel konstant ist.Such a headbox should set the stock density and fiber orientation profile of the paper stock suspension at the latest before the outlet gap in such a way that the basis weight and fiber orientation cross profile of the paper web corresponds to the desired requirements over the entire width, that is to say is generally constant.

Beim Betrieb einer Papiermaschine gibt es zahlreiche Störfaktoren, die den beiden genannten Anforderungen entgegenstehen. Zu diesen Störfaktoren gehören beispielsweise Temperaturschwankungen, Druckschwankungen, Fertigungstoleranzen oder konstruktionsbedingte Unregelmäßigkeiten im Stoffauflauf, die zu problematischen Asymmetrien im Papier führen.When operating a paper machine, there are numerous disruptive factors that conflict with the two requirements mentioned. These disruptive factors include, for example, temperature fluctuations, pressure fluctuations, manufacturing tolerances or design-related irregularities in the headbox, which lead to problematic asymmetries in the paper.

Auf die PCT-Anmeldung WO 89/04396 wird verwiesen.Reference is made to PCT application WO 89/04396.

In der genannten Schrift wird ein Stoffauflauf dargestellt, der in Grundzügen modular aufgebaut ist, wobei der Stoffauflauf aus einem zentralen Verteilungssystem und daran angeschlossenen, einzelnen, die Stoffsuspension flach verteilenden modulularen Formiereinheiten besteht. Nachteil des dargestellten Stoffauflaufes ist zum einen eine ungenügende Symmetrie bezüglich der Suspensionsführung und zum anderen das Fehlen von Vorkehrungen zur sektionierten Beeinflussung der Suspensionseigenschaften.In the cited document, a headbox is shown which has a modular structure, the headbox consisting of a central distribution system and connected, individual modular forming units which distribute the stock suspension flatly. Disadvantages of the headbox shown are, on the one hand, insufficient symmetry with regard to the suspension guidance and, on the other hand, the lack of precautions for the sectioned influencing of the suspension properties.

Aufgabe der Erfindung ist es, einen Stoffauflauf darzustellen, der die Nachteile des Standes der Technik beseitigt und gleichzeitig konstruktiv so gestaltet ist, daß auch mit Bearbeitungsmaschinen kleiner Dimension in Relation breite Stoffaufläufe hergestellt werden können.The object of the invention is to present a headbox which eliminates the disadvantages of the prior art and at the same time is structurally designed such that that relatively large headboxes can also be produced with small-scale processing machines.

Die Aufgabe ist durch die kennzeichnenden Merkmale des Anspruches 1 gelöst.The object is achieved by the characterizing features of claim 1.

Der Erfinder hat erkannt, daß ein wesentliches Kriterium zur Herstellung hochwertiger Papiere darin liegt, daß möglichst jede einzelne Fraktion von Stoffsuspensionen bezogen auf die einzelnen Positionen der Maschinenbreite möglichst gleich behandelt werden, d.h. daß die absolute Symmetrie auch bezüglich des "Vorlebens" der Stoffsuspension, bevor sie den Stoffauflauf verläßt, einen wesentlichen Beitrag zur Gleichmäßigkeit des Papiers über die Maschinenbreite liefert. Ergänzend muß jedoch auch die Möglichkeit gegeben werden, durch entsprechende Mischungen von Stoffsuspensionen unterschiedlicher Eigenschaften sektionsbezogen vorzunehmen, was natürlich auch eine Beeinflussung des Stofflusses je Sektion beinhaltet.The inventor has recognized that an essential criterion for the production of high-quality papers is that each individual fraction of stock suspensions is treated as equally as possible with respect to the individual positions of the machine width, i.e. that the absolute symmetry also with respect to the "preexistence" of the stock suspension before it leaves the headbox makes a significant contribution to the uniformity of the paper across the machine width. In addition, however, the possibility must also be given to carry out section-specific mixing of material suspensions with different properties, which of course also includes an influence on the material flow per section.

Die Erfindung ist anhand der Figuren näher erläutert. Darin ist im einzelnen folgendes dargestellt:The invention is explained in more detail with reference to the figures. The following is shown in detail:

Figur 1 zeigt die Formiereinheit des erfindungsgemäßen Stoffauflaufsystems in perspektivischer Darstellung. In der Darstellung sind vier Modulreihen der maschinenbreit in Laufrichtung und Struktur modular aufgebauten Formiereinheit zu sehen. Jede Reihe besteht aus einem Satz von einzelnen Modulen, die beliebig in sinnfälliger Weise miteinander kombiniert werden können, wobei natürlich auch - in der Figur nicht dargestellt - aufeinander gestapelte Kombinationen möglich sind, was einer 3-dimensionalen Modularität entspricht. In diesem Beispiel ist von hinten gesehen zunächst ein Anschlußstutzensystem 1 zu sehen, an das sich das Übergangsstück 2 anschließt, gefolgt von einem Formationselement 3 wiederum gefolgt von Gleichrichtern 4 mit der daran anschließenden Düse 5.Figure 1 shows the forming unit of the headbox system according to the invention in a perspective view. The illustration shows four rows of modules that are machine-wide in the running direction and structure of a modular forming unit. Each row consists of a set of individual modules, which can be combined with one another in a meaningful manner, whereby of course - not shown in the figure - stacked combinations are also possible, which corresponds to a 3-dimensional modularity. In this example, seen from behind, a connection piece system 1 is first seen, to which the transition piece 2 is connected, followed by a formation element 3, again followed by rectifiers 4 with the nozzle 5 connected to them.

Figur 2 zeigt unterschiedliche Kombinationen von Strukturelementen in der Formiereinheit. Auf der Ebene A ist unter der Position 1 ein Anschlußstück zu sehen, gefolgt von der Position 2, einem Diffusor, daran folgend ein Formationselement 3, gefolgt von einem Gleichrichter 4, der in diesem Fall beispielsweise auch als Teildiffusor aufgebaut ist und daran folgend eine Düse 5 mit geradlinig verlaufender Ober- und Unterlippe. In der Ebene B sind unter 1 und 2 zwei verschiedene Anschlußsysteme, einmal mit 90° Krümmung bzw. mit 45° Anschluß zu sehen, gefolgt von einem direkt darauf folgenden, anders gestalteten Formationselement, dem ebenfalls anders gestalteten Gleichrichter 4 und einer darauf folgenden beidseits S-förmig gekrümmten Stoffauslaufdüse 5. Die Ebene C zeigt ein verlängertes Ansatzstück 1 mit gleichzeitig einem gekürzten Zwischenstück 2, gefolgt von einem Zwischenstück 3, das im Anfangsbereich aus einem Rohrverteilgitter mit einem nachfolgenden Formationselement besteht, danach im Teil 4 ein düsenartig verlaufender Turbulenzeinsatz 4 mit der daran angeschlossenen Düse 5. In Ebene D ist an der Position 3 alternativ ein Lochwalzeneinsatz dargestellt, der mit beliebigen Ausgestaltungen der Ebenen A-C kombiniert werden kann. Ebenso können natürlich alle Elemente der Ebenen A-D an den Positionen 1-5 in sinnvoller Weise kombiniert werden.Figure 2 shows different combinations of structural elements in the forming unit. On level A, a connector can be seen under position 1, followed by position 2, a diffuser, followed by a formation element 3, followed by a rectifier 4, which in this case is also constructed as a partial diffuser, followed by a nozzle 5 with a straight upper and lower lip. In level B, two different connection systems can be seen under 1 and 2, one with a 90 ° curvature or with a 45 ° connection, followed by a directly following, differently designed formation element, the also differently designed rectifier 4 and a subsequent one on both sides S -shaped material outlet nozzle 5. Level C shows an extended extension 1 with a shortened intermediate piece 2, followed by an intermediate piece 3, which in the beginning consists of a pipe distribution grid with a subsequent formation element, then in part 4 a nozzle-like turbulence insert 4 with the Nozzle 5 connected thereto. In level D at position 3 there is alternatively shown a perforated roller insert which can be combined with any configuration of levels AC. Likewise, all elements of levels A-D at positions 1-5 can of course be combined in a meaningful way.

Weiterhin ist es natürlich möglich, z.B. anstelle der Position 1 und/oder 2 ein Mischventil einzusetzen, wie es z.B. aus der Anmeldung G 92 05 111 bekannt ist. Auf diese Weise besteht die Möglichkeit, die Eigenschaften der Stoffsuspension in Verbindung mit dem Mischventil und entsprechenden Steuerungseinheiten mit z.B. zwei Zentralverteilern im Sinne der Erfindung zu betreiben.Furthermore, it is of course possible, e.g. use a mixing valve instead of positions 1 and / or 2, e.g. is known from the application G 92 05 111. In this way, it is possible to combine the properties of the stock suspension with the mixing valve and corresponding control units with e.g. to operate two central distributors in the sense of the invention.

Figur 3 zeigt ein Stoffauflaufsystem mit dem erfindungsgemäßen Zentralverteiler 1, welcher gleichzeitig als Dämpfungselement im bekannten Sinne fungiert. Die Stoffsuspension wird von dem Zentralverteiler 1 über ringförmig am Zentralverteiler angebrachte flexible Leitungen 2 dem Anschlußstutzensystem der Formiereinheit 3 zugeführt. Die Formiereinheit ist aufgebaut wie in den Figuren 1 und 2 beschrieben.FIG. 3 shows a headbox system with the central distributor 1 according to the invention, which simultaneously functions as a damping element in the known sense. The Material suspension is fed from the central distributor 1 to the connecting piece system of the forming unit 3 via flexible lines 2 attached to the central distributor. The forming unit is constructed as described in FIGS. 1 and 2.

Erfindungsgemäß ist es in entsprechender Weise möglich, einen zweiten Zentralverteiler zu installieren, wobei beide Zentralverteiler Stoffsuspension unterschiedlicher Qualitäten zuliefern, und der zweite Zentralverteiler über ebenfalls flexible Leitungen mit dem Anschlußstutzensystem entweder über ein Mischventil verbunden wird, oder ein abwechselndes Anschließen von Leitungen des ersten und danach des zweiten Zentralverteilers in eine Mischkammer vorgenommen wird.According to the invention, it is correspondingly possible to install a second central distributor, both central distributors deliver material suspensions of different qualities, and the second central distributor is also connected to the connecting piece system via flexible lines either via a mixing valve, or an alternating connection of lines of the first and afterwards of the second central distributor is made in a mixing chamber.

Claims (5)

Stoffauflaufsystem einer Papiermaschine mit folgenden Merkmalen: 1.1 es ist ein zentraler Verteiler zur gleichmäßigen Verteilung der Stoffsuspension mit integriertem Dämpfungssystem vorgesehen; 1.2 es ist eine reihenweise, modular aufgebaute Formiereinheit vorgesehen; wobei 1.2.1 je Reihe mindestens ein Modul als Leitungs-Anschlußmodul vorgesehen ist; 1.2.2 je ein Düsenmodul vorgesehen ist; 1.2.3 mindestens ein Zwischenmodul - z.b. ein Formationsmodul, ein Turbulenzmodul, ein Diffusormodul, ein Gleichrichtermodul, ein Lochwalzenmodul oder beliebige Kombinationen davon - vorgesehen ist; 1.2.4 die Zwischenmodule sind bezüglich mindestens einer Ebene in Maschinenrichtung symmetrisch vorgesehen; 1.2.5 die Flanschelemente der Module sind zueinander kompatibel vorgesehen; 1.3 es ist eine Vielzahl von ggf. flexiblen Verbindungsleitungen zwischen Verteiler und Formiereinheit vorgesehen. Headbox system of a paper machine with the following features: 1.1 there is a central distributor for even distribution of the stock suspension with integrated damping system; 1.2 a row-shaped, modularly constructed forming unit is provided; in which 1.2.1 at least one module per line is provided as a line connection module; 1.2.2 a nozzle module is provided; 1.2.3 at least one intermediate module - for example a formation module, a turbulence module, a diffuser module, a rectifier module, a perforated roller module or any combination thereof - is provided; 1.2.4 the intermediate modules are provided symmetrically with respect to at least one plane in the machine direction; 1.2.5 the flange elements of the modules are compatible with each other; 1.3 a large number of flexible connecting lines between the distributor and the forming unit are provided. Stoffauflaufsystem nach Anspruch 1, dadurch gekennzeichnet, daß 2.1 mindestens zwei Verteiler vorgesehen sind; 2.2 in jeder Modulreihe der Formiereinheit ein ganzzahliges Vielfaches der Anzahl der Verteiler an Anschlußstutzen vorgesehen sind; 2.3 allen Leitungen zwischen Verteiler und Formiereinheit mindestens eines Verteilers Regeleinrichtungen zur Strömungsdurchsatzbeeinflussung zugeordnet sind. Headbox system according to claim 1, characterized in that 2.1 at least two distributors are provided; 2.2 an integer multiple of the number of distributors of connecting pieces are provided in each module row of the forming unit; 2.3 all lines between distributor and forming unit of at least one distributor Control devices for influencing the flow rate are assigned. Stoffauflaufsystem nach Anspruch 2, dadurch gekennzeichnet, daß
3.1 jeder Modulreihe mindestens eine Mischeinrichtung zum Mischen von zwei Flüssigkeiten zugeordnet ist, mit: 3.1.1 einer ersten Zuleitung für einen ersten Teilvolumenstrom; 3.1.2 einer zweiten Zuleitung für den zweiten Teilvolumenstrom; 3.1.3 einer Ableitung für den Gemischvolumenstrom mit einem Strömungswiderstand; 3.1.4 einem Mischwinkel zwischen der ersten Zuleitung und der zweiten Zuleitung; wobei 3.1.5 der Mischwinkel derart gewählt ist, daß unabhängig vom zweiten Teilvolumenstrom der Gemischvolumenstrom konstant bleibt. Headbox system according to claim 2, characterized in that
3.1 at least one mixing device for mixing two liquids is assigned to each module row, with: 3.1.1 a first feed line for a first partial volume flow; 3.1.2 a second feed line for the second partial volume flow; 3.1.3 a derivative for the mixture volume flow with a flow resistance; 3.1.4 a mixing angle between the first feed line and the second feed line; in which 3.1.5 the mixing angle is selected such that the mixture volume flow remains constant regardless of the second partial volume flow. Stoffauflaufsystem nach Anspruch 1-3, dadurch gekennzeichnet, daß mindestens zwei aufeinander gestapelte Modulreihen vorgesehen sind.Headbox system according to claims 1-3, characterized in that at least two rows of modules stacked one on top of the other are provided. Stoffauflaufsystem nach Anspruch 4, dadurch gekennzeichnet, daß die übereinander liegenden Modulreihen je Breitensegment einem einzigen Düsenmodul zugeordnet sind.Headbox system according to claim 4, characterized in that the superimposed module rows per width segment are assigned to a single nozzle module.
EP19940108549 1993-06-03 1994-06-03 Headbox for a papermaking machine Expired - Lifetime EP0631011B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4318430 1993-06-03
DE19934318430 DE4318430C2 (en) 1993-06-03 1993-06-03 Headbox system of a paper machine

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EP0631011A1 true EP0631011A1 (en) 1994-12-28
EP0631011B1 EP0631011B1 (en) 2000-03-29

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0708201A1 (en) * 1994-09-20 1996-04-24 Voith Sulzer Papiermaschinen GmbH Head box of a paper machine
DE19845722A1 (en) * 1998-10-05 2000-04-06 Voith Sulzer Papiertech Patent Papermaking stock inlet jet structure
US6261418B1 (en) 1998-10-05 2001-07-17 Voith Sulzer Papiertechnik Patent Gmbh Headbox with flexible support plates
US7578906B2 (en) 2006-02-01 2009-08-25 Astenjohnson, Inc. Headbox and stock delivery system for a papermaking machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008105714A1 (en) * 2007-03-01 2008-09-04 Metso Paper Karlstad Ab Structural element for a functional member of a headbox in a web-manufacturing machine, functional member and headbox made thereof, and associated methods

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988001318A1 (en) * 1986-08-23 1988-02-25 J.M. Voith Gmbh Headbox
DE3730775A1 (en) * 1986-09-19 1988-03-31 Valmet Oy METHOD AND DEVICE IN THE FABRIC OUTLET OF A PAPER MACHINE AND IN ITS INLET PIPE SYSTEM
WO1989004396A1 (en) * 1987-11-04 1989-05-18 J.M. Voith Ag Process for manufacturing web-type materials from fibers or other particles suspended in newtonian or non-newtonian fluids
DE9205111U1 (en) * 1992-04-03 1992-06-11 J.M. Voith Gmbh, 7920 Heidenheim, De
DE4114668A1 (en) * 1991-05-06 1992-11-12 Schultz Hans Joachim Dr Ing Pulp supply on paper making machines - has distributor in pulsation damper with individual supply lines to narrow sections across machine
DE4316054A1 (en) * 1993-05-13 1993-10-14 Voith Gmbh J M Stock inlet for paper-making machine - has sections where mixed part flows from a common feed to set suspension compsn. according to use

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988001318A1 (en) * 1986-08-23 1988-02-25 J.M. Voith Gmbh Headbox
DE3730775A1 (en) * 1986-09-19 1988-03-31 Valmet Oy METHOD AND DEVICE IN THE FABRIC OUTLET OF A PAPER MACHINE AND IN ITS INLET PIPE SYSTEM
WO1989004396A1 (en) * 1987-11-04 1989-05-18 J.M. Voith Ag Process for manufacturing web-type materials from fibers or other particles suspended in newtonian or non-newtonian fluids
DE4114668A1 (en) * 1991-05-06 1992-11-12 Schultz Hans Joachim Dr Ing Pulp supply on paper making machines - has distributor in pulsation damper with individual supply lines to narrow sections across machine
DE9205111U1 (en) * 1992-04-03 1992-06-11 J.M. Voith Gmbh, 7920 Heidenheim, De
DE4316054A1 (en) * 1993-05-13 1993-10-14 Voith Gmbh J M Stock inlet for paper-making machine - has sections where mixed part flows from a common feed to set suspension compsn. according to use

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0708201A1 (en) * 1994-09-20 1996-04-24 Voith Sulzer Papiermaschinen GmbH Head box of a paper machine
US5741401A (en) * 1994-09-20 1998-04-21 Voith Sulzer Papiermaschinen Gmbh Headbox of a paper machine
DE19845722A1 (en) * 1998-10-05 2000-04-06 Voith Sulzer Papiertech Patent Papermaking stock inlet jet structure
US6248214B1 (en) 1998-10-05 2001-06-19 Voith Sulzer Papiertechnik Patent Gmbh Headbox
US6261418B1 (en) 1998-10-05 2001-07-17 Voith Sulzer Papiertechnik Patent Gmbh Headbox with flexible support plates
US7578906B2 (en) 2006-02-01 2009-08-25 Astenjohnson, Inc. Headbox and stock delivery system for a papermaking machine

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Publication number Publication date
EP0631011B1 (en) 2000-03-29
DE4318430A1 (en) 1994-12-08
DE4318430C2 (en) 1997-03-27

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