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EP0789107A2 - Headbox for papermaking machines - Google Patents

Headbox for papermaking machines Download PDF

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Publication number
EP0789107A2
EP0789107A2 EP97101711A EP97101711A EP0789107A2 EP 0789107 A2 EP0789107 A2 EP 0789107A2 EP 97101711 A EP97101711 A EP 97101711A EP 97101711 A EP97101711 A EP 97101711A EP 0789107 A2 EP0789107 A2 EP 0789107A2
Authority
EP
European Patent Office
Prior art keywords
headbox
flows
section
control flows
width
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
EP97101711A
Other languages
German (de)
French (fr)
Other versions
EP0789107A3 (en
EP0789107B1 (en
Inventor
Helmut Heinzmann
Udo Heuser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
JM Voith 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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6408700&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0789107(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by JM Voith GmbH filed Critical JM Voith GmbH
Publication of EP0789107A2 publication Critical patent/EP0789107A2/en
Publication of EP0789107A3 publication Critical patent/EP0789107A3/en
Application granted granted Critical
Publication of EP0789107B1 publication Critical patent/EP0789107B1/en
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/028—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 for paper machines according to the preamble of claim 1.
  • a headbox has become known from DE 35 14 554.
  • Such a headbox should equalize the paper stock suspension at the latest before the outlet gap in such a way that both the stock density (fiber mass per unit volume) is constant over the width of the headbox and the orientation of the fiber. Both are important prerequisites for the finished paper to have a perfect basis weight and thickness profile across the web width, as well as lying flat and not tending to curl.
  • the basic idea of the invention is therefore to section the headbox, which is known per se, and to feed the individual sections partial streams (section streams) whose operating parameters (throughput, stock density, fiber quality) can in turn 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 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 like this: During the quality control of the paper web, it is determined that the basis weight profile deviates from the nominal 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 d C M can be determined from a mass balance. The resulting (corrected) concentration C M depends solely on the ratio of the upstream control currents Q H / Q L. The corrected value C M is thus used as the basis for ratio control by using it as the setpoint (see FIG. 1). The ratio control represents the new control volume flow ratio on. 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.
  • the setpoint changes in the control volume flows for the new concentration C M must be calculated and specified to the controller.
  • the inflow space is then designed in such a way that the two flows mix with one another.
  • the mixer is located inside the headbox.

Landscapes

  • 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 für Papiermaschinen gemäß dem Oberbegriff von Patentanspruch 1. Ein solcher Stoffauflauf ist aus DE 35 14 554 bekannt geworden.The invention relates to a headbox for paper machines according to the preamble of claim 1. Such a headbox has become known from DE 35 14 554.

Ein solcher 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 Flächengewichts- und Dickenprofil über die Bahnbreite hat, als auch flach liegt und nicht zum Rollen neigt.Such a headbox should equalize the paper stock suspension at the latest before the outlet gap in such a way that both the stock density (fiber mass per unit volume) is constant over the width of the headbox and the orientation of the fiber. Both are important prerequisites for the finished paper to have a perfect basis weight and thickness profile across the web width, as well as lying flat and not tending to curl.

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 conflict with the two requirements mentioned. These disruptive factors include, for example, temperature fluctuations, pressure fluctuations and manufacturing tolerances.

Die eingangs genannte DE-Patentschrift 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.The aforementioned DE patent deals with the same problems as described here. There it was already recognized that it depends, both the material density To keep constant across the width of the headbox, as well as to master the fiber orientation, so that as far as possible no cross currents occur in the outlet channel. Above all, it is proposed to change the consistency locally, ie to change the consistency at certain points as required. However, it remains 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. 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, daR jedoch die an sich gute Faserorientierung wieder zerstört wird. Wünschenswert wäre somit, die beiden Parameter, nämlich Stoffdichte und Faserorientierung, unabhängig voneinander beeinflussen zu können.It is also known to change the width of the outlet gap, for example by means of threaded spindles for pivoting or bending the upper lip - see e.g. B. DE-PS 29 42 966 or DE-OS 35 35 849. As a result, the throughput of the suspension can be changed locally. At the same time, however, the flow direction is also influenced locally, and with it the fiber orientation. Because of the local narrowing of the gap, the fibers are given a different flow direction at the narrow points than at other points in the outlet gap. This means that the stock density can be made uniform over the width of the headbox by this so-called displacement control, but that the good fiber orientation is destroyed again. It would therefore be desirable to be able to influence the two parameters, namely material density and fiber orientation, independently of one another.

Die Erfinder haben erkannt, daß die eingangs beschriebene DE-Patentschrift grundsätzlich den richtigen Weg zeigt. Sie haben sich darüber hinaus die Aufgabe gestellt, einen Stoffauflauf dieser Gattung 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 DE patent described in the introduction basically shows the correct way. You have also set yourself the task of specifying a headbox of this type, which makes it possible to influence the two parameters of material density and fiber orientation independently of one another in a practical and reliable manner.

Diese Aufgabe wird durch die kennzeichnenden Merkmale von Patentanspruch 1 gelöst.This object is achieved by the characterizing features of patent claim 1.

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, Faserqualität) 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 feed the individual sections partial streams (section streams) whose operating parameters (throughput, stock density, fiber quality) can in turn 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 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 Weise 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 d CM läßt sich aus einer Massenbilanz ermitteln. Die resultierende (korrigierte) Konzentration CM ist einzig und allein abhängig vom 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 like this: During the quality control of the paper web, it is determined that the basis weight profile deviates from the nominal 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 d C M can be determined from a mass balance. The resulting (corrected) concentration C M depends solely on the ratio of the upstream control currents Q H / Q L. The corrected value C M is thus used as the basis for ratio control by using it as the setpoint (see FIG. 1). The ratio control represents the new control volume flow ratio on. 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. For this purpose, the setpoint changes in the control volume flows for the new concentration C M must be calculated and specified to the controller.

VolumenstromregelungVolume flow 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.In the headbox, cross flows of the suspension in the headbox nozzle e.g. due to edge influences. These then lead to an undesirable influence on the fiber orientation. The reason for this lies in known headboxes in different volume flows over 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 QH 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. According to the diagram in FIG. 1b, two calculated volume flows Q H and Q L must be given to the controllers as new setpoints.

AnwendungsmöglichkeitenPossible uses

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.).
Figs. 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.
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:
Feed the partial mixture flow into the channel between the tube bundles (e.g. 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 also feed two control streams to the headbox section instead of the partial mixing stream. The inflow space is then designed in such a way that the two flows mix with one another. The mixer is located inside the headbox.

Claims (1)

Stoffauflauf für Papiermaschinen mit einem Verteiler zum Verteilen einer zugeführten Stoffsuspension über die Arbeitsbreite der Papiermaschine, einer eine Vielzahl von Löchern oder Kanälen aufweisenden Führungsvorrichtung für die Stoffsuspension und einem maschinenbreiten Auslaufkanal mit Auslaufspalt zum Verteilen der Stoffsuspension, ferner mit Mitteln zum Einstellen der Stoffdichte der Stoffsuspension über die Arbeitsbreite hinweg, gekennzeichnet durch die folgenden Merkmale: (a) Der Stoffauflauf ist über seine Breite hinweg durch Trennwände in Sektionen unterteilt; (b) die einzelne Sektion weist wenigstens eine Zuleitung zum Zuführen eines Teilstromes (Sektionsstromes) auf; (c) der einzelnen Zuleitung ist ein Mischer vorgeschaltet; (d) der Mischer weist zwei Anschlüsse zum Heranführen von Suspensionsströmen (Regelströmen) mit vorgegebenen Betriebsparametern (Druchsatz, Stoffdichte, Faserqualität) auf, so daß sich je nach Mischungsverhältnis dieser Regelströme die Beschaffenheit des Sektionsstromes auf das Genaueste einstellen läßt. Headbox for paper machines with a distributor for distributing a supplied stock suspension over the working width of the paper machine, a guide device for the stock suspension having a plurality of holes or channels and a machine-wide outlet channel with an outlet gap for distributing the stock suspension, furthermore with means for adjusting the stock density of the stock suspension via the working width, characterized by the following features: (a) The headbox is divided into sections across its width by partitions; (b) the individual section has at least one feed line for supplying a partial stream (section stream); (c) the individual feed line is preceded by a mixer; (d) the mixer has two connections for introducing suspension flows (control flows) with predetermined operating parameters (throughput, consistency, fiber quality), so that depending on the mixing ratio of these control flows the nature of the section flow can be adjusted to the most exact.
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
EP91109409A Division EP0462472A1 (en) 1990-06-20 1991-06-08 Headbox for papermaking machines
EP91109409.2 Division 1991-06-08

Publications (3)

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

Family

ID=6408700

Family Applications (3)

Application Number Title Priority Date Filing Date
EP97101711A Revoked EP0789107B1 (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
EP91109409A Ceased EP0462472A1 (en) 1990-06-20 1991-06-08 Headbox for papermaking machines

Family Applications After (2)

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

Country Status (6)

Country Link
EP (3) EP0789107B1 (en)
JP (1) JP3301623B2 (en)
AT (2) ATE227370T1 (en)
CA (1) CA2045038C (en)
DE (3) DE4019593C2 (en)
FI (2) FI912230A (en)

Families Citing this family (85)

* Cited by examiner, † Cited by third party
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
DE4237310C2 (en) * 1992-11-05 1994-07-07 Voith Gmbh J M Headbox with device for adjusting the fiber orientation
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
DE4237309A1 (en) * 1992-11-05 1993-04-08 Voith Gmbh J M
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
DE4241076C2 (en) * 1992-11-05 1995-04-06 Voith Gmbh J M Headbox of a paper machine with a variable lower lip
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
DE4320243C2 (en) † 1993-06-18 1996-02-22 Voith Sulzer Papiermasch Gmbh Headbox for a paper machine
DE4321697C2 (en) * 1993-06-30 2002-05-23 Voith Paper Patent Gmbh Turbulence insert of a paper machine
FI92229C (en) * 1993-07-01 1994-10-10 Valmet Paper Machinery Inc Method and device for headbox adjustment
FI92230C (en) * 1993-07-01 1994-10-10 Valmet Paper Machinery Inc Method of controlling a multilayer inlet and multilayer inlet
DE69434813T2 (en) * 1993-07-01 2007-01-04 Metso Paper, Inc. Method and device for regulating a headbox
FR2714403A1 (en) * 1993-12-23 1995-06-30 Chleq Frote Paper-making stock inlet
EP0681057B1 (en) * 1994-04-29 2002-08-28 Voith Paper Patent GmbH Multi-layer headbox
DE4416898C2 (en) * 1994-05-13 1996-03-28 Voith Sulzer Papiermasch Gmbh Headbox for a paper machine with local admixing of fluid
DE4416899C2 (en) * 1994-05-13 1997-12-18 Voith Sulzer Papiermasch Gmbh Process for the local admixing of fluid into a headbox and device for its execution
DE4416909C2 (en) * 1994-05-13 1997-12-11 Voith Sulzer Papiermasch Gmbh Headbox for a paper machine
DE4422907C2 (en) 1994-06-30 1997-03-06 Voith Gmbh J M Sectional feed of the headbox of a paper machine
US5510005A (en) * 1994-07-25 1996-04-23 Westvaco Corporation Venturi headbox for a papermaking machine
DE4433445C1 (en) * 1994-09-20 1996-03-28 Voith Gmbh J M Headbox of a paper machine
DE4437181C2 (en) * 1994-10-18 1997-02-27 Voith Sulzer Papiermasch Gmbh Headbox for a paper machine
DE9416731U1 (en) * 1994-10-18 1995-01-12 Sulzer-Escher Wyss Gmbh, 88212 Ravensburg Headbox for a paper machine
DE4437180C2 (en) * 1994-10-18 1997-03-20 Voith Sulzer Papiermasch Gmbh Process for producing a headbox and intermediate part of a headbox of a paper or board machine
DE19514236C2 (en) * 1995-04-15 1997-10-02 Voith Sulzer Papiermasch Gmbh Headbox for a paper machine for producing a multi-layer or multi-layer paper web
FR2733773B1 (en) * 1995-05-02 1997-08-01 Allimand HEADBOX FOR PAPER MACHINE
US5603806A (en) * 1995-06-01 1997-02-18 Valmet Corporation Method and apparatus for lateral alignment of the cross-direction quality profile of a web in a paper machine
US5626722A (en) * 1995-06-01 1997-05-06 Valmet Corporation Headbox of a paper/board machine
DE19531475C2 (en) * 1995-08-25 2002-10-31 Pulsar Naturprodukte Gmbh Process for making paper
DE59608786D1 (en) 1995-11-17 2002-04-04 Voith Paper Patent Gmbh Process for influencing the tear length cross profile of a running fibrous web
FI98938C (en) * 1996-06-20 1997-09-10 Valmet Corp Apparatus for combining the dilution flow with the pulp flow from the paper / board divider
DE19632673A1 (en) * 1996-08-14 1998-02-19 Voith Sulzer Papiermasch Gmbh Process for distributing the stock flowing through a paper machine head box
DE19634997C2 (en) * 1996-08-30 1999-08-05 Voith Sulzer Papiermasch Gmbh Control device with a plurality of sensors
DE19634995A1 (en) * 1996-08-30 1998-03-05 Voith Sulzer Papiermasch Gmbh Wet section of a paper machine with a density-controlled headbox and twin-wire former
DE19756203A1 (en) 1996-12-23 1998-09-24 Voith Sulzer Papiermasch Gmbh Wet press in the forming section of a paper or paper board machine
DE19705590A1 (en) * 1997-02-14 1998-08-20 Voith Sulzer Papiermasch Gmbh Paper making machine stock inlet
DE29702548U1 (en) * 1997-02-14 1997-04-10 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Headbox of a paper machine
DE19723860A1 (en) * 1997-06-06 1998-12-10 Voith Sulzer Papiermasch Gmbh Stock inlet
DE19733454A1 (en) 1997-08-02 1999-02-04 Voith Sulzer Papiermasch Gmbh Method and device for detecting and correcting a fiber orientation cross profile change
DE19736047A1 (en) 1997-08-20 1999-02-25 Voith Sulzer Papiermasch Gmbh Device and method for controlling or regulating the basis weight of a paper or cardboard web
DE19736048A1 (en) * 1997-08-20 1999-02-25 Voith Sulzer Papiermasch Gmbh Device and method for controlling or regulating a web property profile
US6117272A (en) * 1998-09-03 2000-09-12 Voith Sulzer Papiermaschinen Device and process for metering auxiliary materials into the flow box of a paper machine
DE19843728A1 (en) 1998-09-24 2000-03-30 Voith Sulzer Papiertech Patent Method and device for keeping the low consistency strand of a headbox system clean
DE19843727A1 (en) * 1998-09-24 2000-03-30 Voith Sulzer Papiertech Patent Process and headbox system to improve the consistency cross profile of a fiber web
DE19843729A1 (en) 1998-09-24 2000-03-30 Voith Sulzer Papiertech Patent Control of the lateral shrinkage profile of a running paper or cardboard web uses on-line mapping to set the composition of the fiber suspension flows by sections at the stock inlet across the machine width
DE19946575A1 (en) * 1999-09-29 2001-04-05 Voith Paper Patent Gmbh Assembly for the separation of gas from a fiber suspension has a main and a secondary dividing wall in the container with underpressure to recirculate the suspension and direct gas-free suspension into a dwell zone
DE10046171A1 (en) * 2000-09-19 2002-03-28 Voith Paper Patent Gmbh Method and device for applying a liquid or pasty application medium to a running material web
GB2367564B (en) 2000-10-04 2004-02-18 Sandusky Walmsley Ltd Method of and apparatus for distribution of paper stock in paper or board making machinery
DE10051802A1 (en) 2000-10-18 2002-04-25 Voith Paper Patent Gmbh Slat of a headbox of a paper, cardboard or tissue machine
DE10106538A1 (en) * 2001-02-13 2002-08-22 Voith Paper Patent Gmbh Mixing unit, for fiber suspension part-flows, has an entry chamber with an eddy choke at the outlet, to give a spiral mixed flow to be smoothed by flow guides to pass to the stock inlet of a papermaking machine
DE10117236A1 (en) * 2001-04-06 2002-10-17 Voith Paper Patent Gmbh Paper making process uses never-dried-pulp with additive introduced by chemical precipitation
DE10121775A1 (en) * 2001-05-04 2002-11-07 Voith Paper Patent Gmbh Method and device for calibrating material density sensors
DE10122047A1 (en) * 2001-05-07 2002-11-14 Voith Paper Patent Gmbh Sheet forming device and method
DE10208610B4 (en) * 2002-02-27 2014-03-06 Voith Patent Gmbh Method for distributing a pulp suspension in the headbox of a paper or board machine and headbox
DE10211178A1 (en) * 2002-03-14 2003-09-25 Voith Paper Patent Gmbh Laminated outlet for production of sandwich plaster board or corrugated cardboard has bends in channel sidewalls to jet outlet
DE10232125A1 (en) * 2002-07-16 2004-02-05 Voith Paper Patent Gmbh Sieve section for the production of a multi-layer fibrous web
DE10234559A1 (en) * 2002-07-30 2004-02-19 Voith Paper Patent Gmbh Papermaking machine for low-volume paper or carton has vortex generator block made of a single integral plastic unit with jets discharging to sieve belt
DE10317720A1 (en) * 2003-04-17 2005-02-17 Voith Paper Patent Gmbh headbox
DE10331039A1 (en) * 2003-07-09 2005-01-27 Voith Paper Patent Gmbh headbox
DE10331040A1 (en) * 2003-07-09 2005-01-27 Voith Paper Patent Gmbh Papermaking assembly fibre suspension headbox has throttle control of dilution mechanism in outer margin
DE10333977A1 (en) * 2003-07-25 2005-02-10 Voith Paper Patent Gmbh headbox
DE10335752A1 (en) * 2003-08-05 2005-03-03 Voith Paper Patent Gmbh Headbox for production of paper or carton web has horizontal cell lines with vortex generators discharging through the jet via parallel horizontal arrays of slats
DE10351295A1 (en) * 2003-10-31 2005-06-02 Voith Paper Patent Gmbh Method for producing a fibrous web and apparatus for carrying out the method
DE10355687A1 (en) * 2003-11-28 2005-06-23 Voith Paper Patent Gmbh Process for producing a fibrous web
DE10358216A1 (en) * 2003-12-12 2005-07-21 Voith Paper Patent Gmbh Method and device for controlling at least one process-relevant property during the production of a fibrous web
DE202004021817U1 (en) 2004-10-21 2011-06-09 Voith Patent GmbH, 89522 Sheet forming system
DE102007033395A1 (en) 2007-07-18 2009-02-19 Voith Patent Gmbh Schrägsiebformer a machine for producing a fibrous web of at least one pulp suspension
DE102008000435A1 (en) 2008-02-28 2009-09-03 Voith Patent Gmbh Schrägsiebformer a machine for producing a fibrous web of at least one pulp suspension
DE102008043358A1 (en) 2008-10-31 2010-05-06 Voith Patent Gmbh Method and device for web transfer
EP2199459A1 (en) 2008-12-16 2010-06-23 Voith Patent GmbH Sheet composition system for a machine for producing a multiple layer sheet of fibrous material
DE102008055184A1 (en) 2008-12-30 2010-07-01 Voith Patent Gmbh Method and device for controlling the moisture cross profile in the area of the wire section
DE102009000696A1 (en) 2009-02-06 2010-08-12 Voith Patent Gmbh Method for producing a multilayer fibrous web and sheet forming apparatus for carrying out the method
DE102009003148A1 (en) 2009-05-15 2010-11-18 Voith Patent Gmbh Method for compensating variations in operation mode of machine for producing fibrous web e.g. paper web, involves controlling actuators for producing reaction, which counter acts variations caused by agent
DE102009027079A1 (en) 2009-06-22 2010-12-23 Voith Patent Gmbh Headbox for a machine for producing a fibrous web
DE102009046968A1 (en) 2009-11-23 2011-05-26 Voith Patent Gmbh headbox
DE102010029601A1 (en) 2010-06-01 2011-12-01 Voith Patent Gmbh Method for checking the condition of closed valve systems for assessing the condition of maintenance
DE102010029602A1 (en) 2010-06-01 2011-12-01 Voith Patent Gmbh Positioning drive and positioning drive system
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
DE102011082836A1 (en) 2011-09-16 2013-03-21 Voith Patent Gmbh Method for controlling and regulating a paper machine
DE102011082914A1 (en) 2011-09-19 2013-03-21 Voith Patent Gmbh Wire section for a machine for producing a fibrous web

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3244055A1 (en) * 1981-12-08 1983-07-21 ASEA AB, 72183 Västeraas Arrangement for controlling the fibre concentration in a fibre suspension
DE3628699A1 (en) * 1986-08-23 1988-03-03 Voith Gmbh J M FABRIC DRAIN
FR2631353A1 (en) * 1988-05-13 1989-11-17 Semti PASTA MIXED FEEDING DEVICE

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2942966C2 (en) * 1979-10-24 1984-04-26 J.M. Voith Gmbh, 7920 Heidenheim Headbox nozzle
DE3514554C3 (en) * 1984-09-19 1998-01-08 Escher Wyss Gmbh Headbox device for a paper machine and method for its operation
DE3535849A1 (en) * 1985-10-08 1987-04-09 Voith Gmbh J M Setting device for the lip of a papermachine hatbox

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3244055A1 (en) * 1981-12-08 1983-07-21 ASEA AB, 72183 Västeraas Arrangement for controlling the fibre concentration in a fibre suspension
DE3628699A1 (en) * 1986-08-23 1988-03-03 Voith Gmbh J M FABRIC DRAIN
FR2631353A1 (en) * 1988-05-13 1989-11-17 Semti PASTA MIXED FEEDING DEVICE

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FI20020790A (en) 2002-04-24
DE59109230D1 (en) 2002-04-18
FI912230A (en) 1991-12-21
EP0785305A1 (en) 1997-07-23
DE4019593C2 (en) 1994-01-20
DE4019593A1 (en) 1992-01-09
DE59109243D1 (en) 2002-12-12
CA2045038C (en) 2006-02-14
JPH04333688A (en) 1992-11-20
ATE227370T1 (en) 2002-11-15
EP0462472A1 (en) 1991-12-27
EP0785305B1 (en) 2002-03-13
ATE214442T1 (en) 2002-03-15
EP0789107A3 (en) 2000-01-19
FI912230A0 (en) 1991-05-08
JP3301623B2 (en) 2002-07-15
EP0789107B1 (en) 2002-11-06
CA2045038A1 (en) 1991-12-21

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