EP1236828B1 - Head box for a paper, board or tissu machine - Google Patents

Head box for a paper, board or tissu machine Download PDF

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Publication number
EP1236828B1
EP1236828B1 EP02000741A EP02000741A EP1236828B1 EP 1236828 B1 EP1236828 B1 EP 1236828B1 EP 02000741 A EP02000741 A EP 02000741A EP 02000741 A EP02000741 A EP 02000741A EP 1236828 B1 EP1236828 B1 EP 1236828B1
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EP
European Patent Office
Prior art keywords
lamella
headbox
nozzle
downstream
length
Prior art date
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Expired - Lifetime
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EP02000741A
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German (de)
French (fr)
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EP1236828A1 (en
Inventor
Wolfgang Ruf
Konstantin Fenkl
Hans Loser
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Voith Patent GmbH
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Voith Paper Patent GmbH
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Publication of EP1236828A1 publication Critical patent/EP1236828A1/en
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    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00Wet end of machines for making continuous webs of paper
    • D21F1/02Head boxes of Fourdrinier machines
    • D21F1/028Details of the nozzle section
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00Wet end of machines for making continuous webs of paper
    • D21F1/02Head boxes of Fourdrinier machines

Definitions

  • the invention relates to a headbox according to the preamble of present claim 1.
  • a slat of a headbox in the form of a multi-layer headbox is from German patent application DE 44 40 079 A1 the applicant known.
  • the two adjacent pulp suspension streams keeps separated until the area of an exit gap.
  • the Slat is designed symmetrically up to the area of the outlet gap and has at its lamella end a double-sided slope on the upper and Bottom of, for example, from 2 ° to 4 °.
  • German patent application DE 43 29 810 A1 the applicant known another such a slat of a headbox.
  • the lamella has grooves in its end region, which are preferably on the upper and Bottom of the slat in different design types and positions or alignments are provided.
  • a headbox of the type mentioned be improved so that its lamella improved geometry at their Lamellenende such that the known disadvantages of the prior Technique are avoided, in particular instabilities in the flow conditions and vibration tendencies.
  • the slope a Helix angle of 1.5 ° to 6 °, preferably from 2.5 ° to 5 °, since In this case, the percentage expansion of the flow area is not too great a value and thus counteracts the generation of separation vortices (turbulences) becomes.
  • the fin end preferably has a height of 0.4 mm to 0.6 mm, preferably of 0.5 mm, on. This height is sufficient to the fin end nor the stiffness necessary for optimal operation of the headbox to rent.
  • Lamella thickness 2 to 6 mm, preferably 4 mm, as these Values have been repeatedly proven in practice in various applications to have.
  • the Structure in the lamella the shape of grooves with rectangular and / or wedge-shaped and / or parabolic and / or round shape with constant and / or different Has depth.
  • the lamella can be formed from at least one high performance polymer be.
  • the high-performance polymer may in particular be a polyphenylsulfone (PPSU), a polyethersulfone (PES), a polyetherimide (PEI) or a polysulfone (PSU).
  • the blade according to the invention can continue in a headbox with sectioned Substance density control (dilution water technology) to be formed.
  • the possibility is created, the Throughput, the consistency and thus the basis weight and the fiber orientation be able to regulate sectionally, and in the presence of optimal slats.
  • the slat in a Headbox for a jet speed of more than 1,500 m / s, preferably of greater than 1,800 m / s, is designed to be installed.
  • the lamella can also be designed as a multilayer headbox Headbox be installed, the lamella, which are essentially the above Has properties, is designed as an intermediate plate.
  • This headbox 1 shows in schematic longitudinal section a headbox 1.
  • This headbox 1 comprises a feeding device 2 for a pulp suspension 3 in the headbox 1.
  • the feeding device 2 is formed as a transverse distribution tube 4; However, in a further embodiment, it may also comprise a central distributor with supply hoses.
  • the headbox 1 further consists of a machine-wide device for generating microturbulences ("turbulence generator") 5, which is preceded by a machine-wide prechamber 6 in the flow direction S (arrow) of the pulp suspension 3.
  • the turbulence generator 5 consists of a multiplicity of turbulence tubes 5.2 of most different shape arranged in rows and in columns next to one another and one above the other.
  • the turbulence generator 5 is followed by a machine-wide headbox nozzle 7 for distributing the pulp suspension 3 between two sieves (lower sieve 8.1, upper sieve 8.2) of a twin-wire former (gap former) 9; however, in a further embodiment, the pulp suspension 3 can also be distributed only to a sieve of a wire mesh or hybrid former.
  • the headbox nozzle 7 with a nozzle length L D is limited in Figure 1 at the beginning of the turbulence generator 5 and the end of an exit slit 7.1 and laterally by an upper nozzle wall 13.1, a lower nozzle wall 13.2 and two side parts, not shown.
  • the two machine-wide blades 10.1, 10.2 are mounted, the lower blade 10.1 articulated and the upper blade is rigidly attached to the turbulence generator 5.
  • the two slats 10.1, 10.2 with a respective slat length L L at their downstream slat ends 11.1, 11.2 on the sides which face the upper nozzle wall 13.2, each with a slope 12.11, 12.12 and on the opposite sides with structures 12.21, 12.22 is provided.
  • the respective lamella length L L takes a value of at least 80% of the nozzle length L D and the flow velocities v S (arrow) of the fibrous suspensions 3, 3.1, 3.2 at the two ends of the lamellae 11.1, 11.2 are in the range of greater than 5 m / s ,
  • the upper nozzle wall 13.2 is provided in the region of the outlet gap 7.1 with a preferably adjustable aperture 7.2, wherein the bevels 12.11, 12.12 of the lamella 10.1, 10.2 are directed towards the aperture 7.2 out.
  • the lamellae 10.1, 10.2 are formed from at least one high-performance polymer, wherein the high-performance polymer is in particular a polyphenylsulfone (PPSU), a polyethersulfone (PES), a polyetherimide (PEI) or a polysulfone (PSU).
  • the fins 10.1, 10.2 of the headbox 1 are under hydraulic and fluidic aspects for a jet velocity v St (arrow) of greater than 1,500 m / s, preferably greater than 1,800 m / s , designed.
  • the headbox shown in Figure 2 in a schematic view of space is formed as a multi-layer headbox 1.1, which has only schematically illustrated feeders 2, 2.1, 2.2 for supplying different pulp suspensions 3, 3.1, 3.2.
  • the headbox 7 is limited in a known manner by two machine-wide nozzle walls 13.1, 13.2. These are connected via a respective known turbulence generator 5, 5.1 with a central stationary partition wall 14.
  • a separating blade 16 is pivotally mounted by means of a hinge 15. Notwithstanding this, the separating blade 16 may also be rigidly secured to the partition wall 14.
  • the plurality of intermediate lamellae 16.1 are designed as lamellae 10.1, 10.2 according to the invention.
  • the multilayer headbox 1.1 according to the invention as headbox with sectioned substance density control (dilution water technology), as claimed in the German patent application DE 40 19 593 A1 of the Applicant, trained.
  • a first high-consistency pulp suspension stream Q H.1 passes through a transverse dividing pipe 4 and via a series of sectional feed pipes 17... 17n branched off to the turbulence generator 5. Deviating from FIG. 2, in each sectional feed pipe 17. n be provided a volumetric flow controller.
  • a second pulp suspension stream having a low consistency Q L for example white water, preferably white water I, via a transverse distribution pipe 4.1 and sectional feed lines 18 ... 18.n into the sectional feed lines 17 ... 17 .n led.
  • Each of the sectional feed lines 18 ... 18.n has a control valve 19 ...
  • a third pulp suspension stream of medium or high consistency Q H.2 passes via a transverse distribution pipe 4.2 and via a series of sectioned feed lines 21... 21n branched off to the turbulence generator 5.1.
  • the headbox 1 shown in Figure 1 may be formed as a headbox with sectioned consistency control (dilution water technology), according to the aforementioned embodiments.
  • FIG. 3a shows a schematic longitudinal section of a downstream lamella end 11.1 of a lamella 10.1 according to the invention.
  • the slope 12.11 have a helix angle ⁇ S of 1.5 ° to 6 °, preferably from 2.5 ° to 5 °, whereas the fin end 11.1 has a height H of 0.4 mm to 0.6 mm, preferably of 0.5 mm.
  • the lamella 10.1 has a predominant lamella thickness D of 2 to 6 mm, preferably 4 mm.
  • the structured fin end 11.1 has in a further design the structure of Grooves 22 with rectangular and / or wedge-shaped and / or parabolic and / or round shape with constant and / or different depths T.
  • FIG. 3b shows three schematic and exemplary plan views according to the view arrow E of FIG. 3a on structured fin ends 11.1 of lamellae 10.1 according to the invention.
  • the structured lamella ends 11.1 of the lamellae 10.1 according to the invention have a multiplicity of grooves 22 with a rectangular (A) and / or wedge-shaped (B) and / or parabolic (C) and / or round shape with a constant and / or different depth can have.
  • Further combinations with regard to the configuration of the structured end regions are known from the German patent application DE 43 29 810 A1 of the Applicant.
  • a headbox of the invention initially created type is created, the lamella of an improved geometry has at its lamella end such that the known disadvantages of the prior art are avoided, in particular instabilities in the Flow conditions and vibration tendencies.

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Abstract

Lamella of a headbox through which at least one fibrous suspension flows. The headbox has a machine-width headbox nozzle with a nozzle length and an exit opening, and the headbox nozzle is delimited by an upper nozzle wall and a lower nozzle wall. The lamella, which is structured and arranged to be mounted within the headbox nozzle, includes a lamella body having a downstream Lamella end structured and arranged to be positioned downstream, relative to a suspension flow direction, of an opposite end of the lamella body, and the downstream lamella end includes a first surface, a portion coupled to an sloped relative to the first surface, and a second surface, located opposite the first surface, provided with a structure.

Description

Die Erfindung betrifft einen Stoffauflauf gemäß dem Oberbegriff des vorliegenden Anspruchs 1.The invention relates to a headbox according to the preamble of present claim 1.

Eine Lamelle eines Stoffauflaufs in Form eines Mehrschichten-Stoffauflaufs ist aus der deutschen Offenlegungsschrift DE 44 40 079 A1 der Anmelderin bekannt. In der Stoffauflaufdüse des offenbarten Stoffauflaufs befindet sich mindestens eine Lamelle, die zwei benachbarte Faserstoffsuspensionsströme bis in den Bereich eines Austrittsspalts voneinander getrennt hält. Die Lamelle ist symmetrisch bis in den Bereich des Austrittsspalts ausgeführt und weist an ihrem Lamellenende eine beidseitige Schräge auf der Ober- und Unterseite von beispielsweise von 2° bis 4° auf.A slat of a headbox in the form of a multi-layer headbox is from German patent application DE 44 40 079 A1 the applicant known. In the headbox of the disclosed headbox There is at least one blade, the two adjacent pulp suspension streams keeps separated until the area of an exit gap. The Slat is designed symmetrically up to the area of the outlet gap and has at its lamella end a double-sided slope on the upper and Bottom of, for example, from 2 ° to 4 °.

Weiterhin ist aus der deutschen Offenlegungsschrift DE 43 29 810 A1 der Anmelderin eine weitere derartige Lamelle eines Stoffauflaufs bekannt. Die Lamelle weist in ihrem Endbereich Nuten auf, die vorzugsweise auf der Oberund Unterseite der Lamelle in verschiedenen Ausgestaltungsarten und Positionierungen beziehungsweise Ausrichtungen vorgesehen sind.Furthermore, from German patent application DE 43 29 810 A1 the applicant known another such a slat of a headbox. The lamella has grooves in its end region, which are preferably on the upper and Bottom of the slat in different design types and positions or alignments are provided.

Die bekannten Lamellenformen und -strukturen weisen allein oder in Kombination miteinander den Nachteil auf, dass sie zu instabilen Strömungsverhältnissen und damit zu Schwingungsneigungen führen, da zum einen die Strömungsverläufe nicht immer symmetrisch, beispielsweise bei Vorhandensein einer Blende am Austrittsspalt, verlaufen und zum anderen etwaige Lamellenstrukturen zu Wirbelvermeidungen nicht optimal angeströmt werden. Diese Schwierigkeiten resultieren in einer Verschlechterung der Strahlqualität und damit in Fehlern in der Faserstoffbahn.The known lamella shapes and structures are alone or in combination the disadvantage that they lead to unstable flow conditions and thus lead to vibration tendencies, on the one hand, the flow paths not always symmetrical, for example in the presence of an aperture on the Exit slit, and on the other possible slat structures to vortex avoidances not optimally flowed. These difficulties result in a deterioration of the beam quality and thus in defects in the fibrous web.

Es ist also Aufgabe der Erfindung, einen Stoffauflauf der eingangs genannten Art derart zu verbessern, dass dessen Lamelle eine verbesserte Geometrie an ihrem Lamellenende dergestalt aufweist, dass die bekannten Nachteile des Stands der Technik vermieden werden, insbesondere Instabilitäten in den Strömungsverhältnissen und Schwingungsneigungen.It is therefore an object of the invention, a headbox of the type mentioned be improved so that its lamella improved geometry at their Lamellenende such that the known disadvantages of the prior Technique are avoided, in particular instabilities in the flow conditions and vibration tendencies.

Diese Aufgabe wird bei einem Stoffauflauf der eingangs genannten Art erfindungsgemäß durch die Merkmale des Kennzeichnenden Teils des Anspruchs 1 gelöst.
Durch diese vorgeschlagene Geometrie ergibt sich der Vorteil der Erreichbarkeit von stabilen Strömungsverhältnissen auch bei unsymmetrischen Strömungskanälen und der bestmöglichen Anströmung des strukturierten stromabwärtigen Lamellenendes hinsichtlich einer Wirbelvermeidung.
This object is achieved according to the invention in a headbox of the type mentioned by the features of the characterizing part of claim 1.
Due to this proposed geometry, the advantage of the availability of stable flow conditions also results in asymmetrical flow channels and the best possible flow of the structured downstream fin end with respect to a vortex avoidance.

Unter strömungstechnischen Aspekten ist es von Vorteil, wenn die Schräge einen Schrägungswinkel von 1,5° bis 6°, vorzugsweise von 2,5° bis 5°, aufweist, da hierbei die prozentuale Erweiterung der Strömungsfläche keinen zu großen Wert annimmt und somit der Erzeugung von Ablösewirbeln (Turbulenzen) entgegengewirkt wird.Under fluidic aspects, it is advantageous if the slope a Helix angle of 1.5 ° to 6 °, preferably from 2.5 ° to 5 °, since In this case, the percentage expansion of the flow area is not too great a value and thus counteracts the generation of separation vortices (turbulences) becomes.

Das Lamellenende weist bevorzugterweise eine Höhe von 0,4 mm bis 0,6 mm, vorzugsweise von 0,5 mm, auf. Diese Höhe ist ausreichend, um dem Lamellenende noch die zum optimalen Betrieb des Stoffauflaufs notwendige Steifigkeit zu verleihen.The fin end preferably has a height of 0.4 mm to 0.6 mm, preferably of 0.5 mm, on. This height is sufficient to the fin end nor the stiffness necessary for optimal operation of the headbox to rent.

Ferner weist die Lamelle unter festigkeitstechnischen Aspekten eine überwiegende Lamellendicke von 2 bis 6 mm, vorzugsweise von 4 mm, auf, da diese Werte sich in der Praxis bei verschiedenen Anwendungsfällen mehrfach bewährt haben.Furthermore, the lamella from strength aspects, a predominant Lamella thickness of 2 to 6 mm, preferably 4 mm, as these Values have been repeatedly proven in practice in various applications to have.

Um eine Möglichkeit der Beeinflussung der Faserorientierung in der fertigen Faserstoffbahn zu erhalten ist die obere Düsenwand im Bereich des Austrittsspalts mit einer vorzugsweise verstellbaren Blende versehen, wobei die Schräge der Lamelle zur Blende hin gerichtet ist.To a possibility of influencing the fiber orientation in the finished fibrous web to obtain the upper nozzle wall in the region of the outlet gap provided with a preferably adjustable aperture, wherein the slope of the Slat is directed towards the aperture.

Unter fertigungs- und strömungstechnischen Aspekten ist es vorteilhaft, wenn die Struktur in der Lamelle die Form von Nuten mit rechteckiger und/oder keilförmiger und/oder parabelförmiger und/oder runder Form mit konstanter und/oder unterschiedlicher Tiefe aufweist.Under production and fluidic aspects, it is advantageous if the Structure in the lamella the shape of grooves with rectangular and / or wedge-shaped and / or parabolic and / or round shape with constant and / or different Has depth.

Unter Berücksichtigung der neuesten Werkstoffentwicklungen auf dem Gebiet der Polymere kann die Lamelle aus mindestens einem Hochleistungspolymer gebildet sein. Das Hochleistungspolymer kann insbesondere ein Polyphenylsulfon (PPSU), ein Polyethersulfon (PES), ein Polyetherimid (PEI) oder ein Polysulfon (PSU) sein.Taking into account the latest material developments in the field of Polymers, the lamella can be formed from at least one high performance polymer be. The high-performance polymer may in particular be a polyphenylsulfone (PPSU), a polyethersulfone (PES), a polyetherimide (PEI) or a polysulfone (PSU).

Unter strömungstechnischen Gesichtpunkten wird die an die Erfindung gestellte Aufgabe verbessert gelöst, wenn die Lamellenlänge einen Wert von mindestens 80 % der Düsenlänge annimmt und die Strömungsgeschwindigkeit der Faserstoffsuspension im Bereich des stromabwärtigen Lamellenendes im Bereich von größter 5 m/s liegt.Under fluidic aspects of the invention is asked Task improved solved when the lamella length has a value of at least 80% of the nozzle length and the flow rate of the pulp suspension in the area of the downstream fin end in the range of largest 5 m / s lies.

Die erfindungsgemäße Lamelle kann weiterhin in einem Stoffauflauf mit sektionierter Stoffdichteregelung (Verdünnungswasser-Technologie) ausgebildet sein. The blade according to the invention can continue in a headbox with sectioned Substance density control (dilution water technology) to be formed.

Bei dieser Ausgestaltung des Stoffauflaufs wird die Möglichkeit geschaffen, den Durchsatz, die Stoffdichte und somit das Flächengewicht und die Faserorientierung sektional regeln zu können, und dies bei Vorhandensein optimaler Lamellen.In this embodiment of the headbox, the possibility is created, the Throughput, the consistency and thus the basis weight and the fiber orientation be able to regulate sectionally, and in the presence of optimal slats.

Um den heutigen und zukünftigen Produktionsanforderungen hinsichtlich Produktionsmenge und dergleichen Rechnung zu tragen, kann die Lamelle in einem Stoffauflauf für eine Strahlgeschwindigkeit von größer 1.500 m/s, vorzugsweise von größer 1.800 m/s, ausgelegt ist, eingebaut sein.To meet the current and future production requirements in terms of production quantity and the like, the slat in a Headbox for a jet speed of more than 1,500 m / s, preferably of greater than 1,800 m / s, is designed to be installed.

Die Lamelle kann auch in einem als Mehrschichten-Stoffauflauf ausgebildeten Stoffauflauf eingebaut sein, wobei die Lamelle, die im wesentlichen die vorgenannten Eigenschaften aufweist, als Zwischenlamelle ausgebildet ist.The lamella can also be designed as a multilayer headbox Headbox be installed, the lamella, which are essentially the above Has properties, is designed as an intermediate plate.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus den Unteransprüchen und der nachfolgenden Beschreibung bevorzugter Ausführungsbeispiele unter Bezugnahme auf die Zeichnung.Further features and advantages of the invention will become apparent from the dependent claims and the following description of preferred embodiments with reference to the drawing.

Es zeigen

Figur 1:
einen schematischen Längsschnitt eines Stoffauflaufs mit zwei erfindungsgemäßen Lamellen;
Figur 2:
eine schematische Raumansicht eines Mehrschichten-Stoffauflaufs mit einer erfindungsgemäßen Lamelle;
Figur 3a:
einen schematischen Längsschnitt eines stromabwärtigen Lamellenendes einer erfindungsgemäßen Lamelle; und
Figur 3b:
schematische Draufsichten auf strukturierte Endbereiche von erfindungsgemäßen Lamellen.
Show it
FIG. 1:
a schematic longitudinal section of a headbox with two lamellae according to the invention;
FIG. 2:
a schematic view of a multi-layer headbox with a blade according to the invention;
FIG. 3a:
a schematic longitudinal section of a downstream fin end of a blade according to the invention; and
FIG. 3b:
schematic plan views of structured end portions of slats according to the invention.

Die Figur 1 zeigt im schematischen Längsschnitt einen Stoffauflauf 1. Dieser Stoffauflauf 1 umfasst eine Zuführvorrichtung 2 für eine Faserstoffsuspension 3 in den Stoffauflauf 1. Die Zuführvorrichtung 2 ist als ein Querverteilrohr 4 ausgebildet; sie kann in weiterer Ausführung jedoch auch einen Zentralverteiler mit Zuführschläuchen umfassen. Der Stoffauflauf 1 besteht weiterhin aus einer maschinenbreiten Vorrichtung zur Erzeugung von Mikroturbulenzen ("Turbulenzerzeuger") 5, der eine maschinenbreite Vorkammer 6 in Strömungsrichtung S (Pfeil) der Faserstoffsuspension 3 vorgeordnet ist. Der Turbulenzerzeuger 5 besteht gemäß dem Stand der Technik aus einer Vielzahl von in Zeilen und in Spalten nebeneinander und übereinander liegenden Turbulenzrohren 5.2 unterschiedlichster Gestalt. Dem Turbulenzerzeuger 5 ist in Strömungsrichtung S (Pfeil) der Faserstoffsuspension 3 eine maschinenbreite Stoffauflaufdüse 7 zum Verteilen der Faserstoffsuspension 3 zwischen zwei Siebe (Untersieb 8.1, Obersieb 8.2) eines nicht näher dargestellten Doppelsiebformers (Gapformer) 9 nachgeordnet; in weiterer Ausführung kann die Faserstoffsuspension 3 jedoch auch nur auf ein Sieb eines Langsieboder Hybridformers verteilt werden. Die Stoffauflaufdüse 7 mit einer Düsenlänge LD ist in Figur 1 anfangsseitig von dem Turbulenzerzeuger 5 und endseitig von einem Austrittsspalt 7.1 und seitlich von einer oberen Düsenwand 13.1, einer unteren Düsenwand 13.2 und zwei nicht dargestellten Seitenteilen begrenzt. In der Stoffauflaufdüse 7 des Stoffauflaufs 1 sind zwei maschinenbreite Lamellen 10.1, 10.2 angebracht, wobei die untere Lamelle 10.1 gelenkig und die obere Lamelle starr am Turbulenzerzeuger 5 befestigt ist.
Erfindungsgemäß sind die beiden Lamellen 10.1, 10.2 mit einer jeweiligen Lamellenlänge LL an ihren stromabwärtigen Lamellenenden 11.1, 11.2 auf den Seiten, welche der oberen Düsenwand 13.2 zugewandt sind, mit je einer Schräge 12.11, 12.12 und auf den gegenüberliegenden Seiten mit Strukturen 12.21, 12.22 versehen ist. Vorzugsweise nimmt die jeweilige Lamellenlänge LL einen Wert von mindestens 80 % der Düsenlänge LD an und die Strömungsgeschwindigkeiten vS (Pfeil) der Faserstoffsuspensionen 3, 3.1, 3.2 im Bereich der beiden Lamellenenden 11.1, 11.2 liegen im Bereich von größer 5 m/s.
Weiterhin ist die obere Düsenwand 13.2 im Bereich des Austrittsspalts 7.1 mit einer vorzugsweise verstellbaren Blende 7.2 versehen, wobei die Schrägen 12.11, 12.12 der Lamelle 10.1, 10.2 zur Blende 7.2 hin gerichtet sind.
Die Lamellen 10.1, 10.2 sind aus mindestens einem Hochleistungspolymer gebildet, wobei das Hochleistungspolymer insbesondere ein Polyphenylsulfon (PPSU), ein Polyethersulfon (PES), ein Polyetherimid (PEI) oder ein Polysulfon (PSU) ist.
Um den heutigen und zukünftigen Produktionsanforderungen hinsichtlich Produktionsmenge und dergleichen Rechnung zu tragen, sind die Lamellen 10.1, 10.2 des Stoffauflaufs 1 unter hydraulischen und strömungstechnischen Gesichtspunkten für eine Strahlgeschwindigkeit vSt (Pfeil) von größer 1.500 m/s, vorzugsweise von größer 1.800 m/s, ausgelegt.
1 shows in schematic longitudinal section a headbox 1. This headbox 1 comprises a feeding device 2 for a pulp suspension 3 in the headbox 1. The feeding device 2 is formed as a transverse distribution tube 4; However, in a further embodiment, it may also comprise a central distributor with supply hoses. The headbox 1 further consists of a machine-wide device for generating microturbulences ("turbulence generator") 5, which is preceded by a machine-wide prechamber 6 in the flow direction S (arrow) of the pulp suspension 3. According to the prior art, the turbulence generator 5 consists of a multiplicity of turbulence tubes 5.2 of most different shape arranged in rows and in columns next to one another and one above the other. In the flow direction S (arrow) of the pulp suspension 3, the turbulence generator 5 is followed by a machine-wide headbox nozzle 7 for distributing the pulp suspension 3 between two sieves (lower sieve 8.1, upper sieve 8.2) of a twin-wire former (gap former) 9; however, in a further embodiment, the pulp suspension 3 can also be distributed only to a sieve of a wire mesh or hybrid former. The headbox nozzle 7 with a nozzle length L D is limited in Figure 1 at the beginning of the turbulence generator 5 and the end of an exit slit 7.1 and laterally by an upper nozzle wall 13.1, a lower nozzle wall 13.2 and two side parts, not shown. In the headbox 7 of the headbox 1 two machine-wide blades 10.1, 10.2 are mounted, the lower blade 10.1 articulated and the upper blade is rigidly attached to the turbulence generator 5.
According to the invention, the two slats 10.1, 10.2 with a respective slat length L L at their downstream slat ends 11.1, 11.2 on the sides which face the upper nozzle wall 13.2, each with a slope 12.11, 12.12 and on the opposite sides with structures 12.21, 12.22 is provided. Preferably, the respective lamella length L L takes a value of at least 80% of the nozzle length L D and the flow velocities v S (arrow) of the fibrous suspensions 3, 3.1, 3.2 at the two ends of the lamellae 11.1, 11.2 are in the range of greater than 5 m / s ,
Furthermore, the upper nozzle wall 13.2 is provided in the region of the outlet gap 7.1 with a preferably adjustable aperture 7.2, wherein the bevels 12.11, 12.12 of the lamella 10.1, 10.2 are directed towards the aperture 7.2 out.
The lamellae 10.1, 10.2 are formed from at least one high-performance polymer, wherein the high-performance polymer is in particular a polyphenylsulfone (PPSU), a polyethersulfone (PES), a polyetherimide (PEI) or a polysulfone (PSU).
In order to take account of today's and future production requirements in terms of production volume and the like, the fins 10.1, 10.2 of the headbox 1 are under hydraulic and fluidic aspects for a jet velocity v St (arrow) of greater than 1,500 m / s, preferably greater than 1,800 m / s , designed.

Der in Figur 2 in schematischer Raumansicht dargestellte Stoffauflauf ist als Mehrschichten-Stoffauflauf 1.1 ausgebildet, der nur schematisch dargestellte Zuführvorrichtungen 2, 2.1, 2.2 zum Zuführen von verschiedenen Faserstoffsuspensionen 3, 3.1, 3.2 aufweist. Die Stoffauflaufdüse 7 ist in bekannter Weise durch zwei maschinenbreite Düsenwände 13.1, 13.2 begrenzt. Diese sind über je einen bekannten Turbulenzerzeuger 5, 5.1 mit einer mittleren stationären Trennwand 14 verbunden. Am auslaufseitigen Ende der Trennwand 14 ist wiederum mittels eines Gelenks 15 eine Trennlamelle 16 schwenkbar befestigt. Abweichend hiervon kann die Trennlamelle 16 auch starr an der Trennwand 14 befestigt sein.
Erfindungsmäß sind die Vielzahl von Zwischenlamellen 16.1 als erfindungsgemäße Lamellen 10.1, 10.2 ausgebildet.
Weiterhin ist der Mehrschichten-Stoffauflauf 1.1 erfindungsgemäß als Stoffauflauf mit sektionierter Stoffdichteregelung (Verdünnungswasser-Technologie), wie er in der deutschen Offenlegungsschrift DE 40 19 593 A1 der Anmelderin beansprucht wird, ausgebildet.
The headbox shown in Figure 2 in a schematic view of space is formed as a multi-layer headbox 1.1, which has only schematically illustrated feeders 2, 2.1, 2.2 for supplying different pulp suspensions 3, 3.1, 3.2. The headbox 7 is limited in a known manner by two machine-wide nozzle walls 13.1, 13.2. These are connected via a respective known turbulence generator 5, 5.1 with a central stationary partition wall 14. At the outlet end of the partition 14, in turn, a separating blade 16 is pivotally mounted by means of a hinge 15. Notwithstanding this, the separating blade 16 may also be rigidly secured to the partition wall 14.
According to the invention, the plurality of intermediate lamellae 16.1 are designed as lamellae 10.1, 10.2 according to the invention.
Furthermore, the multilayer headbox 1.1 according to the invention as headbox with sectioned substance density control (dilution water technology), as claimed in the German patent application DE 40 19 593 A1 of the Applicant, trained.

Ein erster Faserstoffsuspensionsstrom mit hoher Konsistenz QH.1 gelangt über ein Querverteilrohr 4 und über eine davon abgezweigte Reihe von sektionalen Zuführleitungen 17...17.n zum Turbulenzerzeuger 5. Abweichend von Figur 2 kann in jeder sektionalen Zuführleitung 17...17.n ein Volumenstromregler vorgesehen sein. Um nunmehr eine sektionierte Stoffdichteregelung realisieren zu können, wird ein zweiter Faserstoffsuspensionsstrom mit niedriger Konsistenz QL, beispielsweise Siebwasser, vorzugsweise Siebwasser-I, über ein Querverteilrohr 4.1 und sektionalen Zuführleitungen 18...18.n in die sektionalen Zuführleitungen 17...17.n geführt. Jede der sektionalen Zuführleitungen 18...18.n weist ein Regelventil 19...19.n auf, um damit einen regelbaren sektionalen Faserstoffsuspensionsstrom QL zu je einer zugeordneten Mischstelle 20...20.n zu führen, wo er mit dem sektionalen Faserstoffsuspensionsstrom QH.1 vermischt wird. Ein dritter Faserstoffsuspensionsstrom mit mittlerer oder hoher Konsistenz QH.2 gelangt über ein Querverteilrohr 4.2 und über eine davon abgezweigte Reihe von sektionalen Zuführleitungen 21...21.n zum Turbulenzerzeuger 5.1. Bei dieser Ausgestaltung des Mehrschichten-Stoffauflaufs 1.1 wird damit die Möglichkeit geschaffen, den Durchsatz, die Stoffdichte und somit das Flächengewicht und die Faserorientierung sektional regeln zu können, und dies bei Vorhandensein einer optimalen Trennlamelle 16.
Selbstverständlich kann auch der in Figur 1 dargestellte Stoffauflauf 1 als Stoffauflauf mit sektionierter Stoffdichteregelung (Verdünnungswasser-Technologie) ausgebildet sein, entsprechend vorgenannten Ausführungen.
A first high-consistency pulp suspension stream Q H.1 passes through a transverse dividing pipe 4 and via a series of sectional feed pipes 17... 17n branched off to the turbulence generator 5. Deviating from FIG. 2, in each sectional feed pipe 17. n be provided a volumetric flow controller. In order to be able to realize a sectioned material density control, a second pulp suspension stream having a low consistency Q L , for example white water, preferably white water I, via a transverse distribution pipe 4.1 and sectional feed lines 18 ... 18.n into the sectional feed lines 17 ... 17 .n led. Each of the sectional feed lines 18 ... 18.n has a control valve 19 ... 19n, so as to guide a controllable sectional pulp suspension flow Q L to each associated mixing point 20 ... 20.n, where he with the sectioned pulp suspension flow Q H.1 is mixed. A third pulp suspension stream of medium or high consistency Q H.2 passes via a transverse distribution pipe 4.2 and via a series of sectioned feed lines 21... 21n branched off to the turbulence generator 5.1. In this embodiment of the multilayer headbox 1.1 thus the possibility is created to be able to regulate the throughput, the consistency and thus the basis weight and the fiber orientation sectionally, and this in the presence of an optimal separator blade 16th
Of course, the headbox 1 shown in Figure 1 may be formed as a headbox with sectioned consistency control (dilution water technology), according to the aforementioned embodiments.

Die Figur 3a zeigt einen schematischen Längsschnitt eines stromabwärtigen Lamellenendes 11.1 einer erfindungsgemäßen Lamelle 10.1.
Erfindungsgemäß weist die Schräge 12.11 weisen einen Schrägungswinkel αS von 1,5° bis 6°, vorzugsweise von 2,5° bis 5°, auf, wohingegen das Lamellenende 11.1 eine Höhe H von 0,4 mm bis 0,6 mm, vorzugsweise von 0,5 mm, aufweist. Die Lamelle 10.1 besitzt eine überwiegende Lamellendicke D von 2 bis 6 mm, vorzugsweise von 4 mm.
FIG. 3a shows a schematic longitudinal section of a downstream lamella end 11.1 of a lamella 10.1 according to the invention.
According to the invention, the slope 12.11 have a helix angle α S of 1.5 ° to 6 °, preferably from 2.5 ° to 5 °, whereas the fin end 11.1 has a height H of 0.4 mm to 0.6 mm, preferably of 0.5 mm. The lamella 10.1 has a predominant lamella thickness D of 2 to 6 mm, preferably 4 mm.

Das strukturierte Lamellenende 11.1 weist in weiterer Gestaltung die Struktur von Nuten 22 mit rechteckiger und/oder keilförmiger und/oder parabelförmiger und/oder runder Form mit konstanter und/oder unterschiedlicher Tiefe T auf.The structured fin end 11.1 has in a further design the structure of Grooves 22 with rectangular and / or wedge-shaped and / or parabolic and / or round shape with constant and / or different depths T.

Die Figur 3b zeigt drei schematische und beispielhafte Draufsichten gemäß des Ansichtspfeils E der Figur 3a auf strukturierte Lamellenenden 11.1 von erfindungsgemäßen Lamellen 10.1.
Es ist klar ersichtlich, dass die strukturierten Lamellenenden 11.1 der erfindungsgemäßen Lamellen 10.1 eine Vielzahl an Nuten 22 mit rechteckiger (A) und/oder keilförmiger (B) und/oder parabelförmiger (C) und/oder runder Form mit konstanter und/oder unterschiedlicher Tiefe aufweisen können.
Weitere Kombinationen hinsichtlich der Ausgestaltung der strukturierten Endbereiche sind aus der deutschen Offenlegungsschrift DE 43 29 810 A1 der Anmelderin bekannt.
FIG. 3b shows three schematic and exemplary plan views according to the view arrow E of FIG. 3a on structured fin ends 11.1 of lamellae 10.1 according to the invention.
It is clearly evident that the structured lamella ends 11.1 of the lamellae 10.1 according to the invention have a multiplicity of grooves 22 with a rectangular (A) and / or wedge-shaped (B) and / or parabolic (C) and / or round shape with a constant and / or different depth can have.
Further combinations with regard to the configuration of the structured end regions are known from the German patent application DE 43 29 810 A1 of the Applicant.

Zusammenfassend ist festzuhalten, dass durch die Erfindung ein Stoffauflauf der eingangs genannten Art geschaffen wird, dessen Lamelle eine verbesserte Geometrie an ihrem Lamellenende dergestalt aufweist, dass die bekannten Nachteile des Stands der Technik vermieden werden, insbesondere Instabilitäten in den Strömungsverhältnissen und Schwingungsneigungen. In summary, it should be noted that a headbox of the invention initially created type is created, the lamella of an improved geometry has at its lamella end such that the known disadvantages of the prior art are avoided, in particular instabilities in the Flow conditions and vibration tendencies.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Stoffauflaufheadbox
1.11.1
Mehrschichten-StoffauflaufMulti-layer headbox
2, 2.1, 2.22, 2.1, 2.2
Zuführvorrichtungfeeder
3, 3.1, 3.23, 3.1, 3.2
FaserstoffsuspensionFibrous suspension
4, 4.1, 4.24, 4.1, 4.2
Querverteilrohrtransverse distribution
5, 5.15, 5.1
Turbulenzerzeugerturbulence generator
5.25.2
Turbulenzrohrturbulence tube
66
Vorkammerantechamber
77
Stoffauflaufdüseheadbox
7.17.1
Austrittsspaltexit slit
7.27.2
Blendecover
8.18.1
Untersiebbottom wire
8.28.2
Obersiebtop wire
99
Doppelsiebformer (Gapformer)Twin wire former (gap former)
10.1,10.210.1,10.2
Lamellelamella
11.1, 11.211.1, 11.2
Lamellenendelamella end
12.11, 12.1212.11, 12.12
Schrägeslope
12.21, 12.2212:21, 12:22
Strukturstructure
13.113.1
Untere DüsenwandLower nozzle wall
13.213.2
Obere DüsenwandUpper nozzle wall
1414
Trennwandpartition wall
1515
Gelenkjoint
1616
Trennlamelleseparating lamella
16.116.1
Zwischenlamelleintermediate plate
17...17.n17 ... 17.n
Sektionale ZuführleitungSectional supply line
18...18.n18 ... 18.n
Sektionale ZuführleitungSectional supply line
19...19.n19 ... 19.n
Regelventilcontrol valve
20...20.n20 ... 20.n
Mischstelle mixing point
21...21.n21 ... 21.n
Sektionale ZuführleitungSectional supply line
2222
Nutgroove
A, B, CA, B, C
DraufsichtTop view
DD
Lamellendickelamella thickness
Ee
Ansichtspfeilview arrow
HH
Höheheight
LD L D
Düsenlängenozzle length
LL L L
Lamellenlängelamellar length
QH.1 Q H.1
Erster Faserstoffsuspensionsstrom mit hoher Kons.First pulp suspension stream with high cons.
QH.2 Q H.2
Dritter Faserstoffsuspensionsstrom mit mittl./hoh. Kons.Third pulp suspension stream with middle / high. Cons.
QL Q L
Zweiter Faserstoffsuspensionsstrom mit niedriger Kons.Second pulp suspension stream with low cons.
SS
Strömungsrichtung (Pfeil)Flow direction (arrow)
TT
Tiefedepth
vS v p
Strömungsgeschwindigkeit (Pfeil)Flow velocity (arrow)
vSt v St
Strahlgeschwindigkeit (Pfeil)Jet velocity (arrow)
αS α S
Schrägungswinkelhelix angle

Claims (10)

  1. Headbox (1, 1.1) for a paper, board or tissue machine, having at least one lamella (10.1, 10.2), through which at least one fibrous stock suspension (3, 3.1, 3.2) flows, and a machine-width headbox nozzle (7) having an outlet gap (7.1) with a nozzle length (LD), which comprises an upper nozzle wall (13.1) and a lower nozzle wall (13.2) and in which the lamella (10.1, 10.2) is fitted, the lamella (10.1, 10.2) with a lamella length (LL) being provided at its downstream lamella end (11.1, 11.2) with a chamfer (12.11, 12.12) on a side which faces one of the two nozzle walls (13.1, 13.2) and with a structure (12.21, 12.22) on the opposite side, and the structure (12.21, 12.22) having the form of grooves (22) with a rectangular and/or wedge-shaped and/or parabolic and/or round form with a constant and/or different depth (T),
    characterized in that
    the upper nozzle wall (13.1) is provided with a preferably adjustable slice (7.2) in the region of the outlet gap (7.1), and in that the chamfer (12.11, 12.12) is oriented towards the slice (7.2).
  2. Headbox (1, 1.1) having at least one lamella (10.1, 10.2) according to Claim 1,
    characterized in that
    the chamfer (12.11, 12.12) has a chamfer angle (αS) of 1.5° to 6°, preferably of 2.5° to 5°.
  3. Headbox (1, 1.1) having at least one lamella (10.1, 10.2) according to Claim 1 or 2,
    characterized in that
    the downstream lamella end (11.1, 11.2) has a height (H) of 0.4 mm to 0.6 mm, preferably of 0.5 mm.
  4. Headbox (1, 1.1) having at least one lamella (10.1, 10.2) according to one of the preceding claims,
    characterized in that
    the lamella (10.1, 10.2) has a predominant lamella thickness (D) of 2 to 6 mm, preferably of 4 mm.
  5. Headbox (1, 1.1) having at least one lamella (10.1, 10.2) according to one of the preceding claims,
    characterized in that
    the lamella (10.1, 10.2) is formed from at least one high-performance polymer and
    in that the high-performance polymer is a polyphenyl sulphone (PPSU), a polyether sulphone (PES), a polyether imide (PEI) or a polysulphone (PSU).
  6. Headbox (1, 1.1) having at least one lamella (10.1, 10.2) according to one of the preceding claims,
    characterized in that
    the lamella length (LL) assumes a value of at least 80% of the nozzle length (LD).
  7. Headbox (1, 1.1) having at least one lamella (10.1, 10.2) according to one of the preceding claims,
    characterized in that
    the flow velocity (vs) of the fibrous stock suspension (3, 3.1, 3.2) in the region of the downstream lamella end (11.1, 11.2) lies in the range of more than 5 m/s.
  8. Headbox (1, 1.1) having at least one lamella (10.1, 10.2) according to one of the preceding claims,
    characterized in that
    the headbox (1, 1.1) is constructed with sectioned consistency control (dilution water technology).
  9. Headbox (1, 1.1) having at least one lamella (10.1, 10.2) according to one of the preceding claims,
    characterized in that
    the headbox (1) is designed for a jet speed (vjet) of more than 1500 m/min, preferably of more than 1800 m/s.
  10. Headbox (1, 1.1) having at least one lamella (10.1, 10.2) according to one of the preceding claims,
    characterized in that
    the headbox is constructed as a multilayer headbox (1.1) and the lamella (10.1, 10.2) is incorporated as an intermediate lamella (16.1).
EP02000741A 2001-02-14 2002-01-12 Head box for a paper, board or tissu machine Expired - Lifetime EP1236828B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10106684A DE10106684A1 (en) 2001-02-14 2001-02-14 Slat of a headbox of a paper, cardboard or tissue machine
DE10106684 2001-02-14

Publications (2)

Publication Number Publication Date
EP1236828A1 EP1236828A1 (en) 2002-09-04
EP1236828B1 true EP1236828B1 (en) 2005-04-27

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Application Number Title Priority Date Filing Date
EP02000741A Expired - Lifetime EP1236828B1 (en) 2001-02-14 2002-01-12 Head box for a paper, board or tissu machine

Country Status (4)

Country Link
US (1) US20020153113A1 (en)
EP (1) EP1236828B1 (en)
AT (1) ATE294277T1 (en)
DE (2) DE10106684A1 (en)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10122047A1 (en) * 2001-05-07 2002-11-14 Voith Paper Patent Gmbh Sheet forming device and method
FI123339B (en) * 2004-12-08 2013-02-28 Vaahto Oy Arrangement in the headbox
DE102005038424A1 (en) * 2005-08-12 2007-02-15 Voith Patent Gmbh Process for producing a fibrous web and twin-wire former for carrying out the process
FI119441B (en) * 2007-08-20 2008-11-14 Runtech Systems Oy Method for compensating deformation of a paper web
DE102008040688A1 (en) * 2008-07-24 2010-01-28 Voith Patent Gmbh Method for optimizing the energy balance in forming units in machines for producing fibrous webs and forming unit
DE102008043145A1 (en) * 2008-10-24 2010-04-29 Voith Patent Gmbh Two-layer casserole for a machine for producing a two-layer fibrous web
DE102009028385A1 (en) 2009-08-10 2011-02-17 Voith Patent Gmbh Method for operating a sheet forming unit and sheet forming unit
DE102009028389A1 (en) 2009-08-10 2011-02-17 Voith Patent Gmbh Headbox, sheet forming unit with a headbox and method of operating a sheet forming unit
DE102010001613A1 (en) 2010-02-05 2011-08-11 Voith Patent GmbH, 89522 Headbox and sheet forming unit with a headbox
DE102010001610A1 (en) 2010-02-05 2011-08-11 Voith Patent GmbH, 89522 Headbox and sheet forming unit with a headbox
DE102010001615A1 (en) 2010-02-05 2011-08-11 Voith Patent GmbH, 89522 Headbox and sheet forming unit with a headbox
DE102010001614A1 (en) 2010-02-05 2011-08-11 Voith Patent GmbH, 89522 Headbox and sheet forming unit with a headbox
DE102010029580A1 (en) 2010-06-01 2011-12-01 Voith Patent Gmbh Machine for producing a paper web, in particular a sack paper web
EP2707542A4 (en) 2011-05-11 2015-04-08 Hollingsworth & Vose Co Systems and methods for making fiber webs
EP2736713B1 (en) 2011-07-27 2019-06-26 Hollingsworth & Vose Company Method and system for making fiber webs
WO2013016515A1 (en) 2011-07-27 2013-01-31 Hollingsworth & Vose Company Systems and methods for making fiber webs
CN111819325B (en) * 2018-01-05 2023-05-12 国际纸业公司 Paper product with increased bending stiffness and transverse strength and method of making same

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3843470A (en) * 1970-08-31 1974-10-22 Beloit Corp Flexible trailing elements in a paper-making machine headbox having projections thereon extending into the slurry flow
US4617091A (en) * 1983-11-25 1986-10-14 Beloit Corporation Headbox trailing element
US4941950A (en) * 1989-07-26 1990-07-17 Beloit Corporation Headbox with grooved trailing element
US5707495A (en) * 1990-06-20 1998-01-13 J.M. Voith Gmbh Headbox for papermaking machine with more uniform flow
DE4329810C2 (en) * 1993-09-03 1997-02-06 Voith Gmbh J M Geometry of the slat end of a headbox
DE4440079C2 (en) * 1994-11-10 1997-10-02 Voith Sulzer Papiermasch Gmbh Multi-layer headbox
SE506931C2 (en) * 1996-06-12 1998-03-02 Valmet Karlstad Ab Multilayer inbox for a paper machine
AT406172B (en) * 1998-02-05 2000-03-27 Andritz Patentverwaltung DEVICE FOR SUPPLYING A FIBER FIBER SUSPENSION TO A DRAINAGE DEVICE
DE19902623A1 (en) * 1999-01-23 2000-07-27 Voith Sulzer Papiertech Patent Headbox
DE20015471U1 (en) * 2000-09-07 2000-11-16 Valmet Corp., Helsinki Turbulence bar to be installed in the lip channel of a headbox of a paper machine
DE10051802A1 (en) * 2000-10-18 2002-04-25 Voith Paper Patent Gmbh Slat of a headbox of a paper, cardboard or tissue machine

Also Published As

Publication number Publication date
US20020153113A1 (en) 2002-10-24
DE10106684A1 (en) 2002-08-29
ATE294277T1 (en) 2005-05-15
DE50202879D1 (en) 2005-06-02
EP1236828A1 (en) 2002-09-04

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