EP0789107B1 - Headbox for papermaking machines - Google Patents

Headbox for papermaking machines Download PDF

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Publication number
EP0789107B1
EP0789107B1 EP97101711A EP97101711A EP0789107B1 EP 0789107 B1 EP0789107 B1 EP 0789107B1 EP 97101711 A EP97101711 A EP 97101711A EP 97101711 A EP97101711 A EP 97101711A EP 0789107 B1 EP0789107 B1 EP 0789107B1
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EP
European Patent Office
Prior art keywords
flowbox
partial stream
throughput
partial
stream
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Revoked
Application number
EP97101711A
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German (de)
French (fr)
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EP0789107A2 (en
EP0789107A3 (en
Inventor
Helmut Heinzmann
Udo Heuser
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Voith Patent GmbH
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Voith Paper Patent GmbH
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Publication of EP0789107A3 publication Critical patent/EP0789107A3/en
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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
    • D21F1/028—Details of the nozzle 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
    • 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 according to the Preamble of claim 1.
  • a headbox is from FR-A-2 631 353 became known.
  • the paper pulp suspension should have a headbox at the latest before the outlet gap so even that both the consistency (fiber mass per unit volume) is constant across the width of the headbox as also the orientation of the fiber. Both are important prerequisites that the finished paper has both a perfect basis weight and Thickness profile over the web width, as well as lying flat and not tends to roll.
  • Patent DE-A-35 14 554 addresses the same problems as described here. It was already recognized there that it matters both the stock density across the width of the headbox to keep constant, as well as to master the fiber orientation, so that if possible, no cross flows occur in the outlet channel. Doing so mainly proposed to change the consistency locally, i.e. depending on Need to change the consistency at certain points. That remains however, it is open how this should be done.
  • the flow direction is also influenced locally, and with it the fiber orientation.
  • the fiber orientation Through a local narrowing of the gap namely the fibers at the narrow points have a different flow direction issued than at other points of the outlet gap. This means, that indeed the consistency by this so-called displacement regulation can be made uniform over the width of the headbox that however, the good fiber orientation is destroyed again. Desirable would be the two parameters, namely material density and Fiber orientation, to be able to influence independently of each other.
  • the basic idea of the invention is therefore to section the headbox, which is known per se, and to supply the individual sections with partial flows (section flows), the operating parameters (throughput, material density) of which in turn can be set on their own.
  • the section flows Q M each feed a section.
  • the section streams are best conducted separately outside the headbox and only combined with one another in the headbox.
  • Each section stream as such is created by merging two control streams. Depending on the mixing ratio of these control flows, the nature of the section flow can be adjusted very precisely.
  • a practical case can look as follows: It is determined during the quality control of the paper web that the basis weight profile deviates from the set value in an impermissible manner at a certain point in the web width. Accordingly, the stock density of the suspension in the headbox at this point in the headbox must be corrected accordingly. According to the invention, this can be done by changing the concentration C M of the section stream in question. The necessary change dC M can be determined from a mass balance. The resulting (corrected) concentration C M is solely dependent on the ratio of the upstream control currents Q H / Q L. The corrected value C M is thus used as the basis of a ratio control by using it as the setpoint (see FIG. 1). The ratio control sets the new control volume flow ratio. This also changes Q L.
  • control volume flow Q H is corrected according to the continuity equation. This regulation can also be carried out according to the scheme in Fig. 1a. To do this, the setpoint changes in the control volume flows for the new concentration C M must be calculated and specified to the controller.
  • Cross flows of the suspension in the headbox nozzle can occur in the headbox e.g. due to edge influences. These then lead to one undesirable influence on the fiber orientation.
  • the cause of this is in known headboxes in different volume flows across the headbox width.

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  • Paper (AREA)
  • Sewing Machines And Sewing (AREA)
  • Prostheses (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)

Abstract

The stock inlet action, at a papermaking machine, has a distributor to spread the pulp suspension over the working width of the papermaking machine, using a number of openings or channels leading to the outlet slit across the machine width. The distributor separates at least part of the suspension flow into mixture part-flows, where each is formed into at least two control flows of different densities (CH,CL). To correct the paper weight profile in the finished paper material, the density (CM) of each mixture part-flow is individually adjusted by altering the throughputs (QH,QL) of the control flows. The throughputs (QH,QL) of the control flows are matched together, so that the throughput (QM) of the mixture part-flows remains unchanged or is restored to the required value.

Description

Die Erfindung betrifft einen Stoffauflauf einer Papiermaschine gemäß dem Oberbegriff von Patentanspruch 1. Ein solcher Stoffauflauf ist aus der FR-A-2 631 353 bekannt geworden.The invention relates to a headbox of a paper machine according to the Preamble of claim 1. Such a headbox is from FR-A-2 631 353 became known.

Ein Stoffauflauf soll die Papierstoffsuspension spätestens vor dem Auslaufspalt derart vergleichmäßigen, daß sowohl die Stoffdichte (Fasermasse pro Volumeneinheit) über die Breite des Stoffauflaufes konstant ist, als auch die Orientierung der Faser. Beides sind wichtige Voraussetzungen dafür, daß das fertige Papier sowohl ein einwandfreies Flächengewichtsund Dickenprofil über die Bahnbreite hat, als auch flach liegt und nicht zum Rollen neigt.The paper pulp suspension should have a headbox at the latest before the outlet gap so even that both the consistency (fiber mass per unit volume) is constant across the width of the headbox as also the orientation of the fiber. Both are important prerequisites that the finished paper has both a perfect basis weight and Thickness profile over the web width, as well as lying flat and not tends to roll.

Im Betrieb einer Papiermaschine gibt es zahlreiche Störfaktoren, die den beiden genannten Anforderungen entgegenstehen. Zu diesen Störfaktoren gehören beispielsweise Temperaturschwankungen, Druckschwankungen und Fertigungstoleranzen.There are numerous disruptive factors in the operation of a paper machine that affect the conflict with the two requirements mentioned. About these confounding factors include, for example, temperature fluctuations, pressure fluctuations and manufacturing tolerances.

Die Patentschrift DE-A-35 14 554 befaßt sich mit denselben Problemen, wie hier beschrieben. Dort wurde bereits erkannt, daß es darauf ankommt, sowohl die Stoffdichte über die Breite des Stoffauflaufes hinweg konstant zu halten, als auch die Faserorientierung zu beherrschen, so daß möglichst keine Querströmungen im Auslaufkanal auftreten. Dabei wird vor allem vorgeschlagen, die Stoffdichte örtlich zu verändern, d.h. je nach Bedarf an bestimmten Stellen die Stoffdichte zu verändern. Dabei bleibt jedoch offen, auf welche Art und Weise dies vorgenommen werden soll. Patent DE-A-35 14 554 addresses the same problems as described here. It was already recognized there that it matters both the stock density across the width of the headbox to keep constant, as well as to master the fiber orientation, so that if possible, no cross flows occur in the outlet channel. Doing so mainly proposed to change the consistency locally, i.e. depending on Need to change the consistency at certain points. That remains however, it is open how this should be done.

Es ist ferner bekannt, die Weite des Auslaufspaltes zu verändern, beispielsweise durch Gewindespindeln zum Verschwenken oder Verbiegen der Oberlippe - siehe z.B. DE-PS 29 42 966 oder DE-OS 35 35 849. Hierdurch kann der Durchsatz der Suspension örtlich verändert werden.It is also known to change the width of the outlet gap, for example by means of threaded spindles for swiveling or bending the upper lip - see e.g. DE-PS 29 42 966 or DE-OS 35 35 849. This the throughput of the suspension can be changed locally.

Gleichzeitig wird jedoch auch die Strömungsrichtung örtlich beeinflußt, und damit auch die Faserorientierung. Durch eine örtliche Spaltverengung wird nämlich den Fasern an den Engstellen eine andere Strömungsrichtung erteilt, als an anderen Stellen des Auslaufspaltes. Dies bedeutet, daß zwar die Stoffdichte durch diese sogenannte Verdrängungsregelung über die Breite des Stoffauflaufes gleichmäßig gemacht werden kann, daß jedoch die an sich gute Faserorientierung wieder zerstört wird. Wünschenswert wäre somit, die beiden Parameter, nämlich Stoffdichte und Faserorientierung, unabhängig voneinander beeinflussen zu können.At the same time, however, the flow direction is also influenced locally, and with it the fiber orientation. Through a local narrowing of the gap namely the fibers at the narrow points have a different flow direction issued than at other points of the outlet gap. This means, that indeed the consistency by this so-called displacement regulation can be made uniform over the width of the headbox that however, the good fiber orientation is destroyed again. Desirable would be the two parameters, namely material density and Fiber orientation, to be able to influence independently of each other.

Aus der FR-A-2,631 353 ist es bekannt, zum Zwecke der Regelung des Flächengewichtsprofils des Stoffstroms im Auslaufkanal einer Papiermaschine einem dem Auslauf vorgeschalteten Verteiler mehrere Speiseströme einer Stoffsuspension zuzuführen, wobei jeder Speisestrom in einem Mischkasten gebildet wird, dem einerseits in regelbarer Weise eine verdickte Suspension und andererseits ebenfalls in regelbarer Weise eine Flüssigkeit zugeführt wird, so daß über die Regelung eine Stoffsuspension unterschiedlicher Dichte erzeugt werden kann. Mittels dieses bekannten Verfahrens läßt sich das Flächengewichts-Querprofil durch Beeinflussung der einzelnen, dem Verteiler zugeführten Suspensionsströme beeinflussen und korrigieren, aber es sind keine Maßnahmen offenbart, die von dieser Korrekturmöglichkeit unabhängig auch eine Korrektur des Faserorientierungs-Querprofils der Papierbahn ermöglichen würde. From FR-A-2,631 353 it is known for the purpose of regulating the Basis weight profile of the material flow in the outlet channel of a paper machine a feeder upstream of the outlet several feed streams feed a stock suspension, each feed stream in one Mixing box is formed, which on the one hand thickened in an adjustable manner Suspension and on the other hand also in a controllable manner Liquid is supplied so that a substance suspension via the scheme different density can be generated. By means of this known The basis weight cross profile can be modified by influencing of the individual suspension flows fed to the distributor and correct, but no measures are disclosed by this Possibility of correction independently also a correction of the fiber orientation cross profile would enable the paper web.

Die Erfinder haben erkannt, daß die Patentschrift DE-A-35 14 554 grundsätzlich den richtigen Weg zeigt. Sie haben sich darüber hinaus die Aufgabe gestellt, einen Stoffauflauf anzugeben, der es ermöglicht, die beiden Parameter Stoffdichte und Faserorientierung auf praktikable und zuverlässige Weise unabhängig voneinander zu beeinflussen.The inventors have recognized that the patent DE-A-35 14 554 basically shows the right way. You also have the task asked to specify a headbox that allows the two parameters Density and fiber orientation on practical and reliable Way to influence independently.

Diese Aufgabe wird durch die kennzeichnenden Merkmale von Patentanspruch 1 gelöst. Besonders vorteilhafte Ausgestaltungen des Stoffauflaufs nach Patentanspruch 1 sind in den Unteransprüchen angegeben.This object is achieved by the characterizing features of claim 1 solved. Particularly advantageous configurations of the headbox according to claim 1 are specified in the subclaims.

Der Grundgedanke der Erfindung besteht somit darin, den Stoffauflauf zu sektionieren, was an sich bekannt ist, und den einzelnen Sektionen Teilströme (Sektionsströme) zuzuführen, deren Betriebsparameter (Durchsatz, Stoffdichte) wiederum für sich alleine einstellbar sind. Die Sektionsströme QM speisen jeweils eine Sektion. Die Sektionsströme werden am besten außerhalb des Stoffauflaufes getrennt geführt und erst im Stoffauflauf miteinander vereinigt. Jeder Sektionsstrom als solcher entsteht seinerseits durch Zusammenführen zweier Regelströme. Je nach Mischungsverhältnis dieser Regelströme läßt sich die Beschaffenheit des Sektionsstromes aufs Genaueste einstellen.The basic idea of the invention is therefore to section the headbox, which is known per se, and to supply the individual sections with partial flows (section flows), the operating parameters (throughput, material density) of which in turn can be set on their own. The section flows Q M each feed a section. The section streams are best conducted separately outside the headbox and only combined with one another in the headbox. Each section stream as such is created by merging two control streams. Depending on the mixing ratio of these control flows, the nature of the section flow can be adjusted very precisely.

Ein praktischer Fall kann wie folgt aussehen: Es wird bei der Qualitätskontrolle der Papierbahn festgestellt, daß das Flächengewichtsprofil an einer bestimmten Stelle der Bahnbreite vom Sollwert in unzulässiger Wei se abweicht. Demgemäß muß die Stoffdichte der Suspension im Stoffauflauf an dieser Stelle des Stoffauflaufes entsprechend korrigiert werden. Gemäß der Erfindung läßt sich dies durch Verändern der Konzentration CM des betreffenden Sektionsstromes durchführen. Die notwendige Änderung dCM läßt sich aus einer Massenbilanz ermitteln. Die resultierende (korrigierte) Konzentration CM ist einzig und allein abhängig von Verhältnis der vorausgeschalteten Regelströme QH/QL. Der korrigierte Wert CM wird somit als Basis einer Verhältnisregelung ausgenutzt, indem er als Sollwert verwendet wird (siehe Figur 1). Die Verhältnisregelung stellt das neue Regelvolumen-Strömungsverhältnis ein. Dabei ändert sich auch QL. Da aber der Volumenstrom des Mischungsteilstromes konstant bleiben muß, wird der Regelvolumenstrom QH entsprechend der Kontinuitätsgleichung korrigiert. Diese Regelung kann auch nach dem Schema in Fig. 1a durchgeführt werden. Hierzu müssen die Sollwertänderungen der Regelvolumenströme für die neue Konzentration CM berechnet und dem Regler vorgegeben werden.A practical case can look as follows: It is determined during the quality control of the paper web that the basis weight profile deviates from the set value in an impermissible manner at a certain point in the web width. Accordingly, the stock density of the suspension in the headbox at this point in the headbox must be corrected accordingly. According to the invention, this can be done by changing the concentration C M of the section stream in question. The necessary change dC M can be determined from a mass balance. The resulting (corrected) concentration C M is solely dependent on the ratio of the upstream control currents Q H / Q L. The corrected value C M is thus used as the basis of a ratio control by using it as the setpoint (see FIG. 1). The ratio control sets the new control volume flow ratio. This also changes Q L. However, since the volume flow of the partial mixture flow must remain constant, the control volume flow Q H is corrected according to the continuity equation. This regulation can also be carried out according to the scheme in Fig. 1a. To do this, the setpoint changes in the control volume flows for the new concentration C M must be calculated and specified to the controller.

VolumenstromregelungFlow control

Im Stoffauflauf können Querströmungen der Suspension in der Stoffauflaufdüse z.B. durch Randeinflüsse auftreten. Diese führen dann zu einer unerwünschten Beeinflussung der Faserorientierung. Die Ursache hierfür liegt bei bekannten Stoffaufläufen in unterschiedlichen Volumenströmen über die Stoffauflaufbreite.Cross flows of the suspension in the headbox nozzle can occur in the headbox e.g. due to edge influences. These then lead to one undesirable influence on the fiber orientation. The cause of this is in known headboxes in different volume flows across the headbox width.

Bei dieser Regelaufgabe bleibt die Konzentration CM konstant. Der errechnete, notwendige Volumenstrom QH wird als Sollwert dem Regler vorgegeben (Fig. 1a). Nach dem Schema von Fig. 1b müssen zwei errechnete Volumenströme CH und QL den Reglern als neue Sollwerte vorgegeben werden.With this control task, the concentration C M remains constant. The calculated, necessary volume flow Q H is given to the controller as the setpoint (FIG. 1a). According to the diagram in FIG. 1b, two calculated volume flows C H and Q L must be given to the controllers as new setpoints.

Anwendungsmöglichkeitenapplications

Das Verfahren läßt sich auf alle Stoffauflauf-Typen (Einlagen-, Mehrlagen-, Stoffaufläufe für Spaltformer, Langsieb mit und ohne Schwingungsdämpfer, ein oder zwei Rohrbündel usw.) anwenden.

Fig. 2 - 5:
Die Summe der Mischungsteilströme entsprechen dem Gesamtzulaufstrom zum Stoffauflauf. Dadurch wird das konventionelle Verteilrohr ersetzt. Der Mischer liegt außerhalb des Stoffauflaufs.
Fig. 6-11:
Der Mischungsteilstrom einer Sektion ist nur eine Teilmenge des Gesamtstromes der Sektion. Der Reststrom wird konventionell zugeführt.
Fig. 6:
Mischungsteilströme werden im ersten Rohrbündel zugeführt. Diese können auch durch Trennwände nach Fig. 3a auf einem Teil des Strömungsweges voneinander getrennt werden.
Fig. 7 - 8:
Zuführung des Mischungsteilstromes in den Kanal zwischen den Rohrbündeln (z.B. Lochplatten).
Fig. 9 - 10:
Direkte Zuführung des Mischungsteilstromes in eine oder mehrere Rohrzeilen des Turbulenzeinsatzes einer Sektion.
Fig. 11:
Zuführung in den Düsenraum.
The process can be applied to all headbox types (single-layer, multi-layer, headboxes for gap formers, Fourdrinier sieves with and without vibration dampers, one or two tube bundles, etc.).
Fig. 2-5:
The sum of the partial mixing flows corresponds to the total feed flow to the headbox. This replaces the conventional distribution pipe. The mixer is outside the headbox.
Fig. 6-11:
The mixed substream of a section is only a subset of the total stream of the section. The residual current is supplied conventionally.
Fig. 6:
Partial mixture flows are fed in the first tube bundle. These can also be separated from one another by partitions according to FIG. 3a on part of the flow path.
Fig. 7-8:
Feeding the partial mixture flow into the channel between the tube bundles (eg perforated plates).
Fig. 9-10:
Direct feeding of the partial mixture flow into one or more tube rows of the turbulence insert of a section.
Fig. 11:
Feed into the nozzle area.

Man kann der Stoffauflauf-Sektion anstelle des Mischungs-Teilstromes auch zwei Regelströme zuführen. Der Einströmraum ist dann so gestaltet, daß sich die beiden Ströme miteinander durchmischen. Der Mischer befindet sich hierbei innerhalb des Stoffauflaufes.You can use the headbox section instead of the mix stream also supply two control currents. The inflow space is then designed that the two streams mix together. The mixer is located itself within the headbox.

Claims (9)

  1. Flowbox for a papermaking machine for producing a paper web from a stock suspension, having the following features:
    a) the flowbox has a distributor for distributing the stock suspension over the working width of the papermaking machine, and a guide device having a large number of holes or channels and a machine-width outlet channel with an outlet gap;
    b) the flowbox is subdivided into sections over its width and each section is fed with a partial stream of the stock suspension;
    c) each partial stream is formed in a mixer from at least two control streams of different consistency (CH, CL), so that by varying the throughput (QH, QL) of the control steams, firstly the consistency (CM) of each partial stream and secondly the throughput (QM) of each partial stream can be adjusted individually;
    characterized in that for the purpose of correcting the transverse grammage profile of the finished paper web, the consistency (CM) of a partial stream at the outlet of a mixer can be adjusted by varying the throughput (QH, QL) of the control streams by means of a controller, the throughputs (QH, QL) of the control streams being co-ordinated with one another in such a way that the throughput (QM) of the affected partial stream remains unchanged and/or, for the purpose of correcting the transverse fibre orientation profile of the finished paper web, the throughput (QM) of a partial stream at the outlet of a mixer can be adjusted by varying the throughput (QH, QL) of the control streams by means of the controller while keeping the consistency (CM) of the affected partial stream constant.
  2. Flowbox according to Claim 1, characterized in that the partial streams are directed separately outside the flowbox and are combined with each other in the flowbox.
  3. Flowbox according to Claim 1, characterized in that the mixers are located within the flowbox and, for this purpose, the respective inflow chamber is configured in such a way that the two partial streams mix thoroughly with each other.
  4. Flowbox according to one of the preceding claims, characterized in that the partial stream fed to each section forms a subset of the total stream to the section, and the remaining stream is fed conventionally.
  5. Flowbox according to Claim 4, characterized in that each partial stream is fed directly to one or more rows of pipes of a turbulence insert of a section.
  6. Flowbox according to Claim 4, characterized in that each partial stream is fed to a channel between two bundles of pipes, for example comprising perforated plates.
  7. Flowbox according to Claim 4, characterized in that provision is made to feed the partial streams into the nozzle chamber.
  8. Flowbox according to one of the preceding claims, characterized in that a design as a single-ply flowbox is provided.
  9. Flowbox according to one or more of Claims 1 to 7, characterized in that a design as a multi-ply flowbox is provided.
EP97101711A 1990-06-20 1991-06-08 Headbox for papermaking machines Revoked EP0789107B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4019593 1990-06-20
DE4019593A DE4019593C2 (en) 1990-06-20 1990-06-20 Headbox for paper machines
EP91109409A EP0462472A1 (en) 1990-06-20 1991-06-08 Headbox for papermaking machines

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP91109409.2 Division 1991-06-08
EP91109409A Division EP0462472A1 (en) 1990-06-20 1991-06-08 Headbox for papermaking machines

Publications (3)

Publication Number Publication Date
EP0789107A2 EP0789107A2 (en) 1997-08-13
EP0789107A3 EP0789107A3 (en) 2000-01-19
EP0789107B1 true EP0789107B1 (en) 2002-11-06

Family

ID=6408700

Family Applications (3)

Application Number Title Priority Date Filing Date
EP91109409A Ceased EP0462472A1 (en) 1990-06-20 1991-06-08 Headbox for papermaking machines
EP96120331A Revoked EP0785305B1 (en) 1990-06-20 1991-06-08 Process for operating a headbox of a papermaking machine
EP97101711A Revoked EP0789107B1 (en) 1990-06-20 1991-06-08 Headbox for papermaking machines

Family Applications Before (2)

Application Number Title Priority Date Filing Date
EP91109409A Ceased EP0462472A1 (en) 1990-06-20 1991-06-08 Headbox for papermaking machines
EP96120331A Revoked EP0785305B1 (en) 1990-06-20 1991-06-08 Process for operating a headbox of a papermaking machine

Country Status (6)

Country Link
EP (3) EP0462472A1 (en)
JP (1) JP3301623B2 (en)
AT (2) ATE214442T1 (en)
CA (1) CA2045038C (en)
DE (3) DE4019593C2 (en)
FI (2) FI912230A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011078925A1 (en) 2011-07-11 2013-01-17 Voith Patent Gmbh Method for setting uniform property transverse profile of e.g. paper in headbox of fibrous web manufacturing machine, involves integrating basis weight cross profile and fiber orientation cross profile in respective control circuits

Families Citing this family (84)

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Publication number Priority date Publication date Assignee Title
DE4005281C2 (en) * 1990-02-20 1995-04-06 Schultz Hans Joachim Dr Ing Headbox with regulation of the basis weight cross-section via the dilution of the fiber suspension
DE4112347C3 (en) * 1991-04-16 2001-01-18 Voith Gmbh J M Valve device for the paper industry
DE4211291C3 (en) * 1992-04-03 2001-06-07 Voith Gmbh J M Mixing device and method for mixing two liquids at a constant mixture volume flow to supply the headbox of a paper machine
DE4211290C2 (en) * 1992-04-03 1994-07-07 Voith Gmbh J M Mixing device with variable pipe cross-sections for mixing two liquids at a constant mixture volume flow to supply the headbox of a paper machine
DE4213707A1 (en) * 1992-04-25 1993-10-28 Escher Wyss Gmbh Headbox device for a paper machine
DE4237305C2 (en) * 1992-11-05 1994-07-07 Voith Gmbh J M Turbulence insert with variable geometry for a headbox of a paper machine
DE4237307C2 (en) * 1992-11-05 1994-08-18 Voith Gmbh J M Headbox of a machine forming a fibrous web
DE4239845C2 (en) * 1992-11-05 1998-12-03 Voith Gmbh J M Procedure for measuring the effect of adjustments on the headbox and for correcting the basis weight and fiber orientation cross profile
DE4237310C2 (en) * 1992-11-05 1994-07-07 Voith Gmbh J M Headbox with device for adjusting the fiber orientation
DE4241076C2 (en) * 1992-11-05 1995-04-06 Voith Gmbh J M Headbox of a paper machine with a variable lower lip
DE4237309A1 (en) * 1992-11-05 1993-04-08 Voith Gmbh J M
DE4239647C2 (en) * 1992-11-26 1994-11-03 Voith Gmbh J M Method and device for equalizing the basis weight cross-section by means of sieve circuit sectioning
DE4316054C2 (en) * 1993-05-13 1995-11-23 Voith Gmbh J M Headbox of a paper machine
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JPH04333688A (en) 1992-11-20
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CA2045038C (en) 2006-02-14
EP0785305A1 (en) 1997-07-23
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DE59109230D1 (en) 2002-04-18
ATE227370T1 (en) 2002-11-15
DE59109243D1 (en) 2002-12-12
EP0789107A2 (en) 1997-08-13
EP0785305B1 (en) 2002-03-13
EP0789107A3 (en) 2000-01-19
FI912230A (en) 1991-12-21
FI20020790A (en) 2002-04-24
FI912230A0 (en) 1991-05-08
ATE214442T1 (en) 2002-03-15

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