EP0690167B1 - Spectional pulp-feeding for the headbox of a papermaking machine - Google Patents

Spectional pulp-feeding for the headbox of a papermaking machine Download PDF

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Publication number
EP0690167B1
EP0690167B1 EP95108955A EP95108955A EP0690167B1 EP 0690167 B1 EP0690167 B1 EP 0690167B1 EP 95108955 A EP95108955 A EP 95108955A EP 95108955 A EP95108955 A EP 95108955A EP 0690167 B1 EP0690167 B1 EP 0690167B1
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Prior art keywords
line
main
secondary line
main line
stock suspension
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EP95108955A
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German (de)
French (fr)
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EP0690167A2 (en
EP0690167A3 (en
Inventor
Albrecht Dr. Meinecke
Helmut Heinzmann
Wolfgang Ruf
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Voith Patent GmbH
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Voith Paper Patent GmbH
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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
    • D21F1/08—Regulating consistency
    • 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 method for sectional Supply of the headbox of a paper machine with Stock suspension and a device for Execution of the procedure.
  • a headbox is also a Paper machine known that across the machine width distributed a variety of material feeds become. Furthermore, the properties of the Stock suspension in the individual feed lines or Channels each by mixing two Material suspension flows with different properties and different throughput influenced by a Angle for feeding the second suspension stream into the first suspension stream is used, under which there is no Change in the total current of both partial flows results, regardless of their ratio. Requirement is that after the mixing point a relatively strong Throttle is provided. This throttle becomes variable executed, so there is in addition to influencing Density of the total current also the possibility of Total flow with respect to the sectional flow rate influence.
  • the invention has for its object a method and a device for sectional supply of the Headbox of a paper machine with stock suspension which opens up the possibility of the Volume flow between stock suspension distributor and Influence the headbox so that none Fiber wiping occur.
  • FIG. 1 schematically shows a sectional material feed (from the top view) known from WO 88/01318 for a headbox in which the sections S i of the headbox STA - with the vestibule VR, the turbulence-generating area TB and the downstream outlet nozzle DS - are fed from a common distributor via lines L i with stock suspension.
  • Throttles DR i are provided in the lines L i , which make it possible to individually adjust the sectional volume flows in order, for example, to achieve an improved fiber orientation cross profile.
  • FIG. 2 shows a sectional feed system known from DE 40 19 593 (in side view), in which stock suspension is fed from a distributor VT 1 via main lines L1 i to a large number of mixers M i via throttle valves DR1 i .
  • a material suspension of different concentration for example dilution water, is fed into the mixer M i from a further distributor VT i via secondary lines L2 i , regulated by throttles DR2 i .
  • the supply of the individual partial volume flows of the lines L1 i and L2 i is regulated via the throttles DR1 i and DR2 i , so that both the concentration and the amount of the total volume flow can be set as described in the abovementioned application.
  • FIG. 3 shows a sectional material feed (known from DE 42 11 291) (in side view) in which the material suspension is fed from a distributor VT 1 via main lines L1 i to a large number of mixers M i .
  • a material suspension of different concentrations for example dilution water, is fed into the mixer M i from a further distributor VT i via secondary lines L2 i in a controlled manner by throttle valves DR1.
  • the supply via the secondary lines L2 i are, as described in the above-mentioned application, initiated at an angle ⁇ o at which there is no change in the total volume flow after the mixers when the current supplied via the secondary lines L2 i changes .
  • the following throttle DR2 i which is necessary here, must be made adjustable.
  • Figure 4 shows the sectional feed according to the invention with a previous mixer. Similar to FIGS. 2 and 3, two distributors VT 1 and VT 2 are provided, the distributor VT 1 substance suspension containing normal concentration, while dilution liquid with only a low concentration or without fibrous material components is supplied via the distributor VT 2 .
  • high concentration stock suspension is fed from the distributor VT 1 to the mixer M i via main lines L1 i .
  • the mixer M i the stock suspension is fed in the desired manner via supply of dilution liquid (e.g.

Abstract

Stock is supplied to the breast box of a paper machine by a number of distributor feeds across the width of the machine. In at least one of the feeds (main stream) there is a restrictor followed by a feed (side stream) of liquid (e.g. stock suspension, dilution water or water) at an angle. The angle is chosen so that a small change in the rate of flow of the side stream results in a large corresponding or opposing change in the total flow (main stream plus side stream). <IMAGE>

Description

Die Erfindung betrifft ein Verfahren zur sektionalen Versorgung des Stoffauflaufes einer Papiermaschine mit Stoffsuspension und eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method for sectional Supply of the headbox of a paper machine with Stock suspension and a device for Execution of the procedure.

Es ist aus der WO 88/01318 bekannt einen Stoffauflauf über eine Vielzahl von Leitungen aus einem Verteiler mit Stoffsuspension zu versorgen, wobei die einzelnen Volumenströme durch einstellbare Ventile geregelt werden.It is known from WO 88/01318 a headbox using a large number of lines from a distributor To supply stock suspension, the individual Volume flows can be regulated by adjustable valves.

Weiterhin ist eine sektionale Stoffzuführung zum Stoffauflauf mit einer Mischeinrichtung bekannt aus der Patentanmeldung DE 40 19 593. Hier wird eine Mischeinrichtung vorgestellt, die dazu dient mehrere Teilvolumenströme derart zu mischen, daß ein konstanter Gemischvolumenstrom entsteht. Hierzu werden Teilvolumenströme in Mischer geführt und durch Anwendung einer aufwendigen Ventilsteuerung in Abhängigkeit voneinander geregelt.Furthermore, a sectional material feed to the Headbox with a mixing device known from the Patent application DE 40 19 593. Here is a Mixing device presented that serves several Mix partial volume flows in such a way that a constant Mix volume flow occurs. To do this Partial volume flows in mixer and by application a complex valve control depending regulated by each other.

Aus der DE 42 11 291 ist weiterhin ein Stoffauflauf einer Papiermaschine bekannt, dem über die Maschinenbreite verteilt eine Vielzahl von Stoffzuleitungen zugeführt werden. Weiterhin werden die Eigenschaften der Stoffsuspension in den einzelnen Zuführungsleitungen bzw. Kanälen jeweils durch eine Mischung zweier Stoffsuspensionsströme unterschiederlicher Eigenschaften und unterschiedlichen Durchsatzes beeinflußt, indem ein Winkel zum Zuführen des zweiten Suspensionsstromes in den ersten Suspensionsstrom genutzt wird, unter dem sich keine Änderung des Summenstromes beider Teilstöme ergibt, unabhängig von deren Mengenverhältnis. Voraussetzung ist herbei, daß nach der Mischstelle eine relativ starke Drossel vorgesehen ist. Wird diese Drossel variabel ausgeführt, so besteht zusätzlich zur Beeinflussung der Dichte des Summenstromes auch die Möglichkeit den Summenstrom bezüglich der sektionale Durchflußmenge zu beeinflussen.From DE 42 11 291 a headbox is also a Paper machine known that across the machine width distributed a variety of material feeds become. Furthermore, the properties of the Stock suspension in the individual feed lines or Channels each by mixing two Material suspension flows with different properties and different throughput influenced by a Angle for feeding the second suspension stream into the first suspension stream is used, under which there is no Change in the total current of both partial flows results, regardless of their ratio. Requirement is that after the mixing point a relatively strong Throttle is provided. This throttle becomes variable executed, so there is in addition to influencing Density of the total current also the possibility of Total flow with respect to the sectional flow rate influence.

Alle oben genannten Ausführungen bergen jedoch erhebliche Verschmutzungsprobleme, da zur Beeinflussung der Durchsatzmenge der sektionalen Volumenströme, der eine relativ hohe Stoffkonzentration besitzt, ein Ventil eingesetzt werden muß, das wegen seines Ventilaufbaues sehr häufig zu Faserwischbildungen führt und damit die Qualität des hergestellten Papieres beeinträchtigt.However, all of the above statements contain considerable Pollution problems because of influencing the Flow rate of the sectional volume flows, the one has a relatively high concentration of substances, a valve must be used, because of its valve structure very much often leads to fiber wiping and thus the quality of the paper produced is impaired.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zur sektionalen Versorgung des Stoffauflaufes einer Papiermaschine mit Stoffsuspension darzustellen, die die Möglichkeit eröffnet, den Volumenstrom zwischen Stoffsuspensionsverteiler und Stoffauflauf so zu beeinflussen, daß keine Faserwischbildungen auftreten.The invention has for its object a method and a device for sectional supply of the Headbox of a paper machine with stock suspension which opens up the possibility of the Volume flow between stock suspension distributor and Influence the headbox so that none Fiber wiping occur.

Diese Aufgabe wird durch die Merkmale der Ansprüche 1 und 2 gelöst.This object is achieved by the features of claims 1 and 2 solved.

Demgemäß wird in den Zufuhrleitung der Stoffsuspension vom Verteiler zum Stoffauflauf, bzw. den Sektionen des Stoffauflaufes Flüssigkeit, vorzugsweise Stoffsuspension oder Verdünnungswasser, derart eingedüst, daß ein Impulsaustausch zwischen der Hauptströmung und der Nebenströmung stattfindet, so daß die Summe der Gesamtströmung sich mit zunehmenden Durchsatz der - Nebenströmung reduziert.Accordingly, in the feed line of the stock suspension from Distributor to the headbox, or the sections of the Headbox liquid, preferably stock suspension or dilution water, injected such that a Exchange of impulses between the main flow and the Secondary flow takes place, so that the sum of the Total flow itself with increasing throughput of the - Secondary flow reduced.

Die Erfindung wird anhand der Figuren näher beschrieben. Darin ist im Übrigen folgendes dargestellt:

Fig. 1:
Stand der Technik ohne Mischer;
Fig. 2:
Stand der Technik mit Mischer;
Fig. 3:
Stand der Technik mit Mischer für konstanten Gesamtvolumenstrom;
Fig. 4:
erfindungsgemäße sektionale Stoffzufuhr mit vorhergehendem Mischer.
The invention is described in more detail with reference to the figures. It also shows the following:
Fig. 1:
State of the art without mixer;
Fig. 2:
State of the art with mixer;
Fig. 3:
State of the art with mixer for constant total volume flow;
Fig. 4:
sectional feed according to the invention with a previous mixer.

Die Figur 1 zeigt schematisch eine aus der WO 88/01318 bekannte sektionale Stoffzuführung (in der Draufsicht) zu einem Stoffauflauf, bei der die über die Maschinenbreite verteilten Sektionen Si des Stoffauflaufes STA - mit dem Vorraum VR, dem Turbulenz erzeugenden Bereich TB und der nachfolgenden Auslaufdüse DS - aus einem gemeinsamen Verteiler über Leitungen Li mit Stoffsuspension gespeist werden. In den Leitungen Li sind Drosseln DRi vorgesehen, die es ermöglichen die sektionalen Volumenströme individuell einzustellen, um z.B. ein verbessertes Faserorientierungsquerprofil zu erreichen.FIG. 1 schematically shows a sectional material feed (from the top view) known from WO 88/01318 for a headbox in which the sections S i of the headbox STA - with the vestibule VR, the turbulence-generating area TB and the downstream outlet nozzle DS - are fed from a common distributor via lines L i with stock suspension. Throttles DR i are provided in the lines L i , which make it possible to individually adjust the sectional volume flows in order, for example, to achieve an improved fiber orientation cross profile.

Figur 2 zeigt eine aus der DE 40 19 593 bekannte sektionale Stoffzuführung (in Seitenansicht), in der Stoffsuspension aus einem Verteiler VT1 über Hauptleitungen L1i einer Vielzahl von Mischern Mi über Drosselventile DR1i geregelt zugeführt wird. In die Mischer Mi wird aus einem weiteren Verteiler VTi über Nebenleitungen L2i eine Stoffsuspension unterschiedlicher Konzentration, z.B. Verdünnungswasser, durch Drosseln DR2i geregelt zugeführt. Die Zuführung der einzelnen Teilvolumenströme der Leitungen L1i und L2i wird über die Drosseln DR1i und DR2i geregelt, so daß sich sowohl die Konzentration als auch die Menge des Gesamtvolumenstromes, wie in der o.g. Anmeldung beschrieben, einstellen läßt.FIG. 2 shows a sectional feed system known from DE 40 19 593 (in side view), in which stock suspension is fed from a distributor VT 1 via main lines L1 i to a large number of mixers M i via throttle valves DR1 i . A material suspension of different concentration, for example dilution water, is fed into the mixer M i from a further distributor VT i via secondary lines L2 i , regulated by throttles DR2 i . The supply of the individual partial volume flows of the lines L1 i and L2 i is regulated via the throttles DR1 i and DR2 i , so that both the concentration and the amount of the total volume flow can be set as described in the abovementioned application.

Figur 3 zeigt eine aus der DE 42 11 291 bekannte sektionale Stoffzuführung (in Seitenansicht) in der Stoffsuspension aus einem Verteiler VT1 über Hauptleitungen L1i einer Vielzahl von Mischern Mi zugeführt wird. In die Mischer Mi wird aus einem weiteren Verteiler VTi über Nebenleitungen L2i eine Stoffsuspension unterschiedlicher Konzentration, z.B. Verdünnungswasser, durch Drosselventile DR1, geregelt zugeführt. Die Zuführung über die Nebenleitungen L2i werden, wie in der o.g. Anmeldung beschrieben, unter einem Winkel βo eingeleitet, bei dem keine Änderung des Gesamtvolumenstromes nach den Mischern bei Änderung des zugeführten Stromes über die Nebenleitungen L2i stattfindet. Sollen die Gesamtvolumenströme jedoch geregelt sein, so muß die nachfolgende, hier notwendige Drossel DR2i einstellbar ausgeführt werden.FIG. 3 shows a sectional material feed (known from DE 42 11 291) (in side view) in which the material suspension is fed from a distributor VT 1 via main lines L1 i to a large number of mixers M i . A material suspension of different concentrations, for example dilution water, is fed into the mixer M i from a further distributor VT i via secondary lines L2 i in a controlled manner by throttle valves DR1. The supply via the secondary lines L2 i are, as described in the above-mentioned application, initiated at an angle β o at which there is no change in the total volume flow after the mixers when the current supplied via the secondary lines L2 i changes . However, if the total volume flows are to be regulated, the following throttle DR2 i , which is necessary here, must be made adjustable.

Bei allen Ausführungsvarianten der Figuren 1 - 3 ergibt sich das Problem, daß eine gezielte Änderung des Gesamtvolumenstromes nur erreicht werden kann, wenn die Drosseln im Gesamtvolumenstrom oder in beiden Teilvolumenströmen variabel gestaltet sind, womit immer eine erhöhte Verschmutzungsgefahr besteht, was zu einer Verminderung der Papierqualität durch Faserwische führt.In all variants of the figures 1-3 results the problem that a targeted change in the Total volume flow can only be achieved if the Throttles in the total volume flow or in both Partial flow rates are variable, which always there is an increased risk of contamination, which leads to a Decrease in paper quality due to fiber wiping.

Figur 4 zeigt die erfindungsgemäße sektionale Stoffzufuhr mit vorhergehendem Mischer. Es sind ähnlich der Figuren 2 und 3 zwei Verteiler VT1 und VT2 vorgesehen, wobei der Verteiler VT1 Stoffsuspension normale Konzentration enthält, während über den Verteiler VT2 Verdünnungsflüssigkeit mit nur geringer Konzentration oder ohne Faserstoffanteile zugeführt wird. Bei der dargestellten Ausführung wird Stoffsuspension hoher Konzentration aus dem Verteiler VT1 über Hauptleitungen L1i dem Mischer Mi zugeführt. Im Mischer Mi wird die Stoffsuspension in gewünschter Weise über Zufuhr von Verdünnungsflüssigkeit (z.B. Siebwasser) aus dem Verteiler VT2 über die Nebenleitungen L3i - geregelt durch einstellbare Drosseln DR1i - dem Mischer in einem Winkel βo zugeführt, so daß sich keine Änderungen des Gesamtströmungsvolumens in Abhängigkeit von der Menge der zugeführten Verdünnungsflüssigkeit ergeben. Hinter dem Mischern Mi ist eine feste Drossel DR3i installiert, die für den notwendigen Druckabfall sorgt. Über die Nebenleitungen L2i wird nun ebenfalls Verdünnungsflüssigkeit aus dem Verteiler VT2 - geregelt durch einstellbare Drosseln DR2i - in die, aus dem Mischer austretenden Hauptströme Hi unter einem Winkel α eingedüst. Der Winkel α wird dabei so gewählt, daß eine kleine Volumenstromänderung des Nebenstromes Ni eine große Volumenstromänderung des Gesamtstromes Gi, der zur jeweiligen Stoffauflaufsektion führt, bewirkt wird.Figure 4 shows the sectional feed according to the invention with a previous mixer. Similar to FIGS. 2 and 3, two distributors VT 1 and VT 2 are provided, the distributor VT 1 substance suspension containing normal concentration, while dilution liquid with only a low concentration or without fibrous material components is supplied via the distributor VT 2 . In the illustrated embodiment, high concentration stock suspension is fed from the distributor VT 1 to the mixer M i via main lines L1 i . In the mixer M i , the stock suspension is fed in the desired manner via supply of dilution liquid (e.g. white water) from the distributor VT 2 via the branch lines L3 i - regulated by adjustable throttles DR1 i - to the mixer at an angle β o , so that no changes of the total flow volume depending on the amount of diluent supplied. A fixed throttle DR3 i is installed behind the mixer M i , which ensures the necessary pressure drop. Dilution liquid from the distributor VT 2 - regulated by adjustable throttles DR2 i - is now also injected into the main streams H i emerging from the mixer at an angle α via the secondary lines L2 i . The angle α is chosen so that a small change in the volume flow of the secondary flow N i causes a large change in the volume flow of the total flow G i , which leads to the respective headbox section.

Abhängig vom gewählten Winkel α sind die folgenden Konstellationen möglich:

  • a) 180° ≥ α >> βo, vorzugsweise α ≈ 180° und hohe Geschwindigkeit in der Nebenleitung bei kleinem Volumen in der Nebenleitung:
    Hierbei wird durch eine Erhöhung des Nebenstromes durch Impulsaustausch eine überproportionale Reduktion des Gesamtstromes erreicht. Gegengerichtete Strömung.
  • b) βo >> α ≥ 0°, vorzugsweise α ≈ 0° und hohe Geschwindigkeit in der Nebenleitung bei kleinem Volumen in der Nebenleitung:
  • Hierbei wird durch eine Erhöhung des Nebenstromes ebenfalls eine überproportionale Erhöhung des Gesamtstromes erreicht. Gleichgerichtete Strömung.
  • c) α ≈ 90°, Geschwindigkeit in der Nebenleitung ist sehr groß gegenüber der in der Hauptleitung:
  • Hierbei wird durch eine Erhöhung des Nebenstromes der Gesamtstrom überproportional reduziert. Nadelstrahl mit Sperrwirkung, Erzeugung stark turbulenter Strömung.
    • Depending on the selected angle α, the following constellations are possible:
  • a) 180 ° ≥ α >> β o , preferably α ≈ 180 ° and high speed in the secondary line with a small volume in the secondary line:
    In this case, a disproportionate reduction in the total flow is achieved by increasing the bypass flow through pulse exchange. Reverse flow.
  • b) β o >> α ≥ 0 °, preferably α ≈ 0 ° and high speed in the secondary line with a small volume in the secondary line:
  • Here, a disproportionate increase in the total flow is also achieved by increasing the bypass flow. Rectified flow.
  • c) α ≈ 90 °, speed in the secondary line is very high compared to that in the main line:
  • The total current is disproportionately reduced by increasing the bypass flow. Barrier-effect needle jet, generation of highly turbulent flow.

    • Der besondere Vorteil der dargestellten Ausführungen liegt darin, daß bei allen Ausführungsformen das oder die einstellbaren und zur Verschmutzung neigenden Drosselventile nicht in der Suspensionsströmug mit hoher Konzentration liegen müssen, sondern jeweils im Strang der Verdünnungsflüssigkeit liegen. Insbesondere bei der Lösung in Verbindung mit einer Konzentrations-Regulierung der Sektionsströme ist auch die geringfügig auftretende Änderung der Stoffkonzentration des entsprechenden Abschnittes problemlos, da dies durch Einstellung der Konzentration des Stoffsuspension des Hauptstromes mit dem davor liegenden Mischer wieder kompensiert werden kann.The particular advantage of the versions shown is in the fact that in all the embodiments adjustable and prone to contamination Throttle valves are not in the suspension flow with high Concentration must lie, but in the strand of the Dilution liquid. Especially with the solution in connection with a concentration regulation of the Section currents is also the minor one Change the substance concentration of the corresponding Section without any problems since this is done by setting the Concentration of the material suspension of the main stream with the previous mixer can be compensated again.

    Claims (4)

    1. Method for the sectional supply of a flow box (STA) of a papermaking machine with stock suspension, in which stock suspension is supplied to the flow box (STA) distributed over the machine width via a large number of main lines (L1i) from a stock suspension manifold, a mixing unit (Mi) being provided in at least one main line (L1i), to which at least one further supply line (L3i) for supplying stock suspension or dilution water of different composition is assigned at an angle (β0), a means (DR3i) of influencing the respective throughput being provided in at least one of the additional supply lines (L3i) to the mixing unit (Mi), and a non-adjustable restrictor (DR1i) being provided in the at least one main line (L1i) downstream of the mixing unit (Mi),
      characterized in that, downstream of the restrictor (DR1i), the liquid is supplied into the main line (L1i) by means of a secondary line (L2i) at an angle (α),
      in that the angle (α) between the main line (L1i) and the secondary line (L2i) is chosen such that a small change in the throughput of the secondary line (L2i) results in a large change, in the same direction or in the opposite direction, in the throughput of the main and secondary line (L1i, L2i),
      in that the respective throughput in the secondary line (L2i) is influenced by a means (DR2i),
      in that the inflow velocity in the secondary line (L2i) is chosen to be substantially higher than the velocity in the main line (L1i), and
      in that the volume flow in the secondary line (L2i) is chosen to be substantially lower than that in the main line (L1i).
    2. Apparatus for the sectional supply of a flow box (STA) of a papermaking machine with stock suspension, in which a large number of main lines (L1i) distributed over the machine width is provided to supply stock suspension to the flow box (STA) from a stock suspension manifold, a mixing unit (Mi) being provided in at least one main line (L1i), to which at least one further supply line (L3i) for supplying stock suspension or dilution water of different composition is assigned at an angle (β0), a means (DR3i) of influencing the respective throughput being provided in at least one of the additional supply lines (L3i) to the mixing unit (Mi), and a non-adjustable restrictor (DR1i) being provided in the at least one main line (L1i) downstream of the mixing unit (Mi),
      characterized in that, downstream of the restrictor (DR1i), at least one secondary line (L2i) for the supply of liquid opens into the main line (L1i) at an angle (α),
      in that the angle (α) between the main line (L1i) and the secondary line (L2i) is chosen such that a small change in the throughput of the secondary line (L2i) results in a large change, in the same direction or in the opposite direction, in the throughput of the main and secondary line (L1i, L2i),
      and in that a means (DR2i) of influencing the respective throughput is provided in the secondary line (L2i),
      and in that the secondary line (L2i) is designed for an inflow velocity substantially higher than the velocity in the main line (L1i) and a volume flow substantially lower than that in the main line (L1i).
    3. Apparatus according to Claim 2, characterized in that the opening of the secondary line (L2i) is oriented in the same direction or opposite direction in relation to the main line (L1i).
    4. Apparatus according to Claim 2 or 3, characterized in that the main line and the secondary line (L1i, L2i) form a right angle, and
      in that the ratio of the cross section of the main line (L1i) to the secondary line (L2i) is Hi/Ni > 10.
    EP95108955A 1994-06-30 1995-06-10 Spectional pulp-feeding for the headbox of a papermaking machine Expired - Lifetime EP0690167B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE4422907A DE4422907C2 (en) 1994-06-30 1994-06-30 Sectional feed of the headbox of a paper machine
    DE4422907 1994-06-30

    Publications (3)

    Publication Number Publication Date
    EP0690167A2 EP0690167A2 (en) 1996-01-03
    EP0690167A3 EP0690167A3 (en) 1997-03-19
    EP0690167B1 true EP0690167B1 (en) 2004-08-18

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    EP95108955A Expired - Lifetime EP0690167B1 (en) 1994-06-30 1995-06-10 Spectional pulp-feeding for the headbox of a papermaking machine

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    US (1) US5683551A (en)
    EP (1) EP0690167B1 (en)
    JP (1) JPH08170291A (en)
    AT (1) ATE274099T1 (en)
    CA (1) CA2152830A1 (en)
    DE (2) DE4422907C2 (en)
    FI (1) FI113554B (en)

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    DE19718034A1 (en) * 1997-04-29 1998-11-05 Voith Sulzer Papiermasch Gmbh Stock inlet
    US5904809A (en) * 1997-09-04 1999-05-18 Ahlstrom Paper Group Oy Introduction of fiber-free foam into, or near, a headbox during foam process web making
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    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
    DE19906062A1 (en) * 1999-02-12 2000-08-17 Voith Sulzer Papiertech Patent Method and device for producing a material web
    DE19908898A1 (en) 1999-03-02 2000-09-07 Voith Sulzer Papiertech Patent Process for metering a fluid medium into a suspension stream of a headbox and headbox
    FI119559B (en) * 2007-06-01 2008-12-31 Upm Kymmene Corp Procedure for treating pulp

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    Also Published As

    Publication number Publication date
    EP0690167A2 (en) 1996-01-03
    FI953228A0 (en) 1995-06-29
    FI953228A (en) 1995-12-31
    CA2152830A1 (en) 1995-12-31
    DE4422907A1 (en) 1996-01-11
    ATE274099T1 (en) 2004-09-15
    US5683551A (en) 1997-11-04
    EP0690167A3 (en) 1997-03-19
    DE59510935D1 (en) 2004-09-23
    JPH08170291A (en) 1996-07-02
    DE4422907C2 (en) 1997-03-06
    FI113554B (en) 2004-05-14

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