EP0631011B1 - Headbox for a papermaking machine - Google Patents

Headbox for a papermaking machine Download PDF

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Publication number
EP0631011B1
EP0631011B1 EP19940108549 EP94108549A EP0631011B1 EP 0631011 B1 EP0631011 B1 EP 0631011B1 EP 19940108549 EP19940108549 EP 19940108549 EP 94108549 A EP94108549 A EP 94108549A EP 0631011 B1 EP0631011 B1 EP 0631011B1
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EP
European Patent Office
Prior art keywords
modules
headbox
forming unit
headbox system
row
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Expired - Lifetime
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EP19940108549
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German (de)
French (fr)
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EP0631011A1 (en
Inventor
Hans-Joachim Dr. Schultz
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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 system according to the generic term of Claim 1.
  • Such a headbox is said to be the density and Fiber orientation profile of the pulp suspension adjust at the latest before the outlet gap so that the Basis weight and fiber orientation cross profile of Paper web over the entire width the desired Usually meets requirements is constant.
  • WO-A-89 04 396 shows a headbox, which has a modular structure, the Headbox from a central distribution system and connected, individual, the stock suspension flat distributing modular forming units.
  • the headbox shown is on the one hand insufficient symmetry with regard to the suspension and on the other hand the lack of precautions for the sectioned Influencing the suspension properties.
  • the object of the invention is a headbox to illustrate the disadvantages of the prior art eliminated and at the same time designed so that even with small-scale processing machines in Relatively wide headboxes can be produced.
  • the task is characterized by the characteristics of the Claim 1 solved.
  • the inventor has recognized that an essential criterion for the production of high quality papers is that if possible, every single fraction of substance suspensions related to the individual positions of the machine width are treated as equally as possible, i.e. that the absolute Symmetry also with regard to the "example” of the Stock suspension before leaving the headbox, one essential contribution to the uniformity of the paper provides the machine width.
  • the Possibility to be given by appropriate mixtures of suspensions of different properties to perform section-related which of course also Influencing the material flow per section includes.
  • Figure 1 shows a forming unit 30 of an inventive Headbox system in perspective.
  • the illustration shows four machine-wide module rows in Direction and structure of modular construction See forming unit.
  • Each row consists of a sentence of individual modules that are arbitrary in a meaningful way can be combined with each other, of course also - not shown in the figure - stacked on top of each other Combinations are possible, what a 3-dimensional Modularity corresponds.
  • This example is from behind seen first to see a connector system 1 that the transition piece 2 follows, followed by one Formation element 3 in turn followed by rectifiers 4 with the adjoining nozzle 5.
  • Figure 2 shows different combinations of Structural elements in the forming unit 30.
  • a connector can be seen under position 1, followed by position 2, a diffuser, following it a formation element 3, followed by a rectifier 4, in this case, for example, also as a partial diffuser is constructed and then a nozzle 5 with a straight line running upper and lower lip.
  • a rectifier 4 in this case, for example, also as a partial diffuser is constructed and then a nozzle 5 with a straight line running upper and lower lip.
  • level B are under 1 and 2 two different connection systems, one with To see 90 ° curvature or with 45 ° connection, followed by a immediately following, differently designed Formation element, which is also designed differently Rectifier 4 and a subsequent S-shaped on both sides curved material outlet nozzle 5.
  • the plane C shows a extended attachment 1 with a shortened at the same time Intermediate piece 2, followed by an intermediate piece 3, which in Starting area from a pipe distribution grid with a subsequent formation element, then in part 4 a nozzle-like turbulence insert 4 with the connected nozzle 5.
  • level D is at the Position 3 alternatively shows a perforated roller insert, the with any configurations of levels A-C can be combined. Of course everyone can do the same Elements of levels A-D at positions 1-5 in more meaningful Ways can be combined.
  • FIGS Figure 3 shows a headbox system with the central distributor 10 according to the invention, which simultaneously acts as a damping element in the known sense.
  • the Stock suspension is transferred from the central distributor 10 flexible attached in a ring on the central distributor Lines 20 to the connection system of the forming unit 30 fed.
  • the forming unit 30 is constructed as in FIGS Figures 1 and 2 described.
  • a second central distributor both of which central distributor material suspension different Deliver qualities, and the second central distributor about also flexible lines 20 with the connector system is either connected via a mixing valve, or a alternately connecting lines of the first and then the second central distributor into a mixing chamber is made.

Description

Die Erfindung betrifft ein Stoffauflaufsystem nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a headbox system according to the generic term of Claim 1.

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 is said to be the density and Fiber orientation profile of the pulp suspension adjust at the latest before the outlet gap so that the Basis weight and fiber orientation cross profile of Paper web over the entire width the desired Usually meets requirements is 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.There are numerous when operating a paper machine Disruptive factors that meet the two requirements mentioned oppose. These disruptive factors include for example temperature fluctuations, pressure fluctuations, Manufacturing tolerances or design-related Irregularities in the headbox that lead to problematic Asymmetries in the paper lead.

In WO-A-89 04 396 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 modularen 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.WO-A-89 04 396 shows a headbox, which has a modular structure, the Headbox from a central distribution system and connected, individual, the stock suspension flat distributing modular forming units. disadvantage the headbox shown is on the one hand insufficient symmetry with regard to the suspension and on the other hand the lack of precautions for the sectioned Influencing 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 a headbox to illustrate the disadvantages of the prior art eliminated and at the same time designed so that even with small-scale processing machines in Relatively wide headboxes can be produced.

Die Aufgabe ist durch die kennzeichnenden Merkmale des Anspruches 1 gelöst.The task is characterized by the characteristics of the Claim 1 solved.

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 if possible, every single fraction of substance suspensions related to the individual positions of the machine width are treated as equally as possible, i.e. that the absolute Symmetry also with regard to the "example" of the Stock suspension before leaving the headbox, one essential contribution to the uniformity of the paper provides the machine width. In addition, however, the Possibility to be given by appropriate mixtures of suspensions of different properties to perform section-related, which of course also Influencing the material flow per section includes.

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. In this the following is shown in detail:

Figur 1 zeigt eine Formiereinheit 30 eines 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 a forming unit 30 of an inventive Headbox system in perspective. In the The illustration shows four machine-wide module rows in Direction and structure of modular construction See forming unit. Each row consists of a sentence of individual modules that are arbitrary in a meaningful way can be combined with each other, of course also - not shown in the figure - stacked on top of each other Combinations are possible, what a 3-dimensional Modularity corresponds. This example is from behind seen first to see a connector system 1 that the transition piece 2 follows, followed by one Formation element 3 in turn followed by rectifiers 4 with the adjoining nozzle 5.

Figur 2 zeigt unterschiedliche Kombinationen von Strukturelementen in der Formiereinheit 30. 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 30. On level A a connector can be seen under position 1, followed by position 2, a diffuser, following it a formation element 3, followed by a rectifier 4, in this case, for example, also as a partial diffuser is constructed and then a nozzle 5 with a straight line running upper and lower lip. In level B are under 1 and 2 two different connection systems, one with To see 90 ° curvature or with 45 ° connection, followed by a immediately following, differently designed Formation element, which is also designed differently Rectifier 4 and a subsequent S-shaped on both sides curved material outlet nozzle 5. The plane C shows a extended attachment 1 with a shortened at the same time Intermediate piece 2, followed by an intermediate piece 3, which in Starting area from a pipe distribution grid with a subsequent formation element, then in part 4 a nozzle-like turbulence insert 4 with the connected nozzle 5. In level D is at the Position 3 alternatively shows a perforated roller insert, the with any configurations of levels A-C can be combined. Of course everyone can do the same Elements of levels A-D at positions 1-5 in more meaningful Ways can be combined.

Weiterhin ist es natürlich möglich, z.B. anstelle der Position 1 und/oder 2 ein Mischventil einzusetzen, wie es z.B. aus der Anmeldung DE-U-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 zentralen Verteilern im Sinne der Erfindung zu betreiben.Furthermore, it is of course possible, e.g. instead of Position 1 and / or 2 to use a mixing valve as it e.g. is known from the application DE-U-92 05 111. To this There is a possibility to change the properties of the Stock suspension in connection with the mixing valve and corresponding control units with e.g. two to operate central distributors in the sense of the invention.

Figur 3 zeigt ein Stoffauflaufsystem mit dem erfindungsgemäßen zentralen Verteiler 10, welcher gleichzeitig als Dämpfungselement im bekannten Sinne fungiert. Die Stoffsuspension wird von dem zentralen Verteiler 10 über ringförmig am zentralen Verteiler angebrachte flexible Leitungen 20 dem Anschlußstutzensystem der Formiereinheit 30 zugeführt. Die Formiereinheit 30 ist aufgebaut wie in den Figuren 1 und 2 beschrieben.Figure 3 shows a headbox system with the central distributor 10 according to the invention, which simultaneously acts as a damping element in the known sense. The Stock suspension is transferred from the central distributor 10 flexible attached in a ring on the central distributor Lines 20 to the connection system of the forming unit 30 fed. The forming unit 30 is constructed as in FIGS Figures 1 and 2 described.

Erfindungsgemäß ist es in entsprechender Weise möglich, einen zweiten zentralen Verteiler zu installieren, wobei beide zentralen Verteiler Stoffsuspension unterschiedlicher Qualitäten zuliefern, und der zweite zentrale Verteiler über ebenfalls flexible Leitungen 20 mit dem Anschlußstutzensystem entweder über ein Mischventil verbunden wird, oder ein abwechselndes Anschließen von Leitungen des ersten und danach des zweiten zentralen Verteilers in eine Mischkammer vorgenommen wird.According to the invention, it is correspondingly possible to install a second central distributor, both of which central distributor material suspension different Deliver qualities, and the second central distributor about also flexible lines 20 with the connector system is either connected via a mixing valve, or a alternately connecting lines of the first and then the second central distributor into a mixing chamber is made.

Claims (10)

  1. Headbox system for a paper machine, comprising at least one central distributor (10) for distributing a stock suspension uniformly, having an integrated damping system; a modularly constructed forming unit (30) which arranges a plurality of adjacent rows beside one another, each row comprising at least one line connection module (1), one nozzle module (5) and at least one intermediate module (2; 3; 4) which is symmetrical in relation to at least one plane in the machine direction, the modules having flange elements which fit together; and a plurality of connecting lines (20) between distributor (10) and forming unit (30), characterized in that each row is connected to the at least one central distributor (10) via a plurality of connecting lines (20).
  2. Headbox system according to Claim 1, characterized in that at least two central distributors (10) are provided.
  3. Headbox system according to Claim 2, characterized in that in each row of the forming unit (30), the number of line connection modules (1) corresponds to an integer multiple of the number of distributors (10).
  4. Headbox system according to Claim 2 or 3, characterized in that each row is assigned at least one mixing device for mixing two liquids, having a first feed line for a first volume part flow, a second feed line for a second volume part flow and a discharge line for the mixture volume flow, having a flow resistance, a mixing angle between the first feed line and the second feed line being selected such that the mixture volume flow remains constant irrespective of the second volume part flow.
  5. Headbox system according to one of the preceding claims, characterized in that the forming unit (30) comprises at least two rows stacked one above another.
  6. Headbox system according to Claim 5, characterized in that the rows located one above another are assigned to a single and joint nozzle module (5).
  7. Headbox system according to one of Claims 1 to 6, characterized in that all the lines (20) between forming unit (30) and the at least one central distributor (10) are assigned regulating devices for influencing the flow throughput.
  8. Headbox system according to one of Claims 1 to 7, characterized in that the intermediate module (2, 3, 4) is designed or combined from the group of modules comprising formation modules, turbulence modules, diffuser modules, rectifier modules and perforated-roll modules.
  9. Headbox system according to one of Claims 1 to 8, characterized in that the connecting lines (20) are designed to be flexible.
  10. Headbox system according to one of Claims 1 to 9, characterized in that the forming unit (30) comprises four adjacent rows.
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

Publications (2)

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

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EP19940108549 Expired - Lifetime EP0631011B1 (en) 1993-06-03 1994-06-03 Headbox for a papermaking machine

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EP (1) EP0631011B1 (en)
DE (1) DE4318430C2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007089900A2 (en) 2006-02-01 2007-08-09 Astenjohnson, Inc. Headbox and stock delivery system for a papermaking machine

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4433445C1 (en) * 1994-09-20 1996-03-28 Voith Gmbh J M Headbox of a paper machine
US6261418B1 (en) 1998-10-05 2001-07-17 Voith Sulzer Papiertechnik Patent Gmbh Headbox with flexible support plates
DE19845722A1 (en) * 1998-10-05 2000-04-06 Voith Sulzer Papiertech Patent Papermaking stock inlet jet structure
CN101622399B (en) * 2007-03-01 2012-10-17 梅特索·佩珀·卡尔斯塔德公司 Structural element for a functional member of a headbox in a web-manufacturing machine, functional member and headbox made thereof, and associated methods

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3628699A1 (en) * 1986-08-23 1988-03-03 Voith Gmbh J M FABRIC DRAIN
FI83549C (en) * 1986-09-19 1991-07-25 Valmet Oy FOERFARANDE OCH ANORDNING VID INLOPPSLAODAN OCH DESS TILLSTROEMNINGSSYSTEM I EN PAPPERSMASKIN.
EP0427712A1 (en) * 1987-11-04 1991-05-22 J.M. Voith Ag Process for manufacturing web-type materials from fibers or other particles suspended in newtonian or non-newtonian fluids
DE4114668C2 (en) * 1991-05-06 1995-10-26 Schultz Hans Joachim Dr Ing Method for basis weight cross-profile control in a sheet formation system and device for carrying out the method
DE9205111U1 (en) * 1992-04-03 1992-06-11 J.M. Voith Gmbh, 7920 Heidenheim, De
DE4316054C2 (en) * 1993-05-13 1995-11-23 Voith Gmbh J M Headbox of a paper machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007089900A2 (en) 2006-02-01 2007-08-09 Astenjohnson, Inc. Headbox and stock delivery system for a papermaking machine

Also Published As

Publication number Publication date
EP0631011A1 (en) 1994-12-28
DE4318430A1 (en) 1994-12-08
DE4318430C2 (en) 1997-03-27

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