EP0936301B1 - Apparatus for feeding a fibre suspension on a dewatering device - Google Patents

Apparatus for feeding a fibre suspension on a dewatering device Download PDF

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Publication number
EP0936301B1
EP0936301B1 EP98124784A EP98124784A EP0936301B1 EP 0936301 B1 EP0936301 B1 EP 0936301B1 EP 98124784 A EP98124784 A EP 98124784A EP 98124784 A EP98124784 A EP 98124784A EP 0936301 B1 EP0936301 B1 EP 0936301B1
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EP
European Patent Office
Prior art keywords
eccentric
tip
partition
adjustable
eccentric shaft
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EP98124784A
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German (de)
French (fr)
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EP0936301A2 (en
EP0936301A3 (en
Inventor
Wilhelm Dipl.-Ing. Mausser
Manfred Ing. Schmid
Walter Writzl
Rudolf Dipl.-Ing. Greimel
Harald Weigant
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Andritz AG
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Andritz AG
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • 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
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
    • D21F9/006—Complete machines for making continuous webs of paper of the twin-wire type paper or board consisting of two or more layers

Definitions

  • the invention relates to a two-layer or multilayer headbox for Supplying a fiber suspension to a dewatering device, especially for a tissue machine with one or more Lamella tips to separate the individual areas, the Lamellar tips (n) as one-piece, wedge-shaped lamellar tip (s) (12, 12 ') is or are made of steel.
  • Such devices also called headbox, affect the Paper formation and thus the paper quality is essential.
  • Headboxes are a regulation of the flow rate of the fiber suspension practically only accessible via printing.
  • Multi-layer headboxes that affect the quality of the paper surface however, a different flow rate is possible, such as for different qualities of top and Bottom are required, not realizable.
  • DE 196 52 983 VOITH SULZER PAPIERMASCHINEN GMBH
  • a separating element a multi-layer headbox here in addition to one Bayonet connection between two components of the separating element in the obviously preferred embodiment yet another Tip component is provided. It is fastened in the housing probably analogous to DE 37 04 462 (SULZER-ESCHER-WYSS).
  • a swiveling partition and an adjustable lip are provided.
  • the aim of the invention is therefore the scope and To improve control options for headboxes.
  • the invention is therefore characterized in that the Lamella tip (s) by means of a tie rod against the partition of the Feed device are biased and the lamella tip (s) and the partition / walls form rigid separating element.
  • This makes it possible to have a stable one Separation and therefore constant adjustment of the outlet gap heights to achieve even with different inlet pressures, so that between a differential speed for the individual suspension flows can be adjusted. Due to the preload of the slat tip (s) a particularly stable and therefore exact setting of the Outlet gap heights possible.
  • a favorable embodiment of the invention is characterized in that that the distance from the lower lip and / or upper lip to the lamella tip is adjustable. This allows the slat tip to be fixed and very stable be carried out.
  • An advantageous embodiment of the invention is characterized in that that to adjust the height of the outlet gap between a minimum and maximum value an eccentric shaft is provided.
  • a favorable further development of the invention is characterized in that that the upper lip is adjustable by means of an eccentric, and alternatively or the lower lip can also be adjustable by means of an eccentric.
  • the Adjustment of upper and / or lower lip enables depending on the version as a two- or multi-layer headbox the ideal conditions for Regulation of the flow rate of the individual layers.
  • a favorable embodiment of the invention is characterized in that that a partition - slat tip unit adjustable by means of an eccentric is.
  • An advantageous embodiment of the invention is characterized in that that the eccentric shaft is supported several times over the machine width, the support can take place at regular intervals.
  • a favorable further development of the invention is characterized in that that the eccentric shaft is connected to a geared motor.
  • the outlet height can also be adjusted during the operation of the paper machine and thus the flow rate of the fiber suspension accordingly be adjusted or regulated.
  • FIG. 1 shows a two-layer headbox according to the invention
  • FIG. 1a a detail in Fig. 1
  • Fig. 2 shows a three-layer headbox
  • Fig. 2a shows a detail in Fig. 2
  • Fig. 3 shows a section along line III-III in Fig. 2.
  • Fig. 1 sets up a device for supplying fiber suspensions a drainage device, in particular for a tissue machine, in the form of a two-layer headbox.
  • the suspension fed simultaneously via two channels 1 across the machine direction, then the flow direction of the suspension is 90 degrees in Machine direction redirected.
  • the suspension through two turbulence generating chambers 2 into the nozzle spaces run out discharge chambers 3, 4, at the end of which Leaves device and strikes the drainage device.
  • the two nozzle spaces 3, 4 are separated by a wall 8, which means cannulated screws 9 is biased against the support body 10.
  • the construction is designed so that even with constant turning the eccentric shaft 16, 16 'by a drive 22, the upper lip 18th and the lower lip 18 'never in contact with the blade tip 12 come and thus no damage can occur.
  • Fig. 1a shows a detail of the outlet gap in Fig. 1. It is clearly the different size of the outlet gaps a (nozzle space 3) and b (Nozzle area 4) recognizable.
  • Fig. 2 now shows a three-layer headbox, the suspension Simultaneously via three channels 1 across the machine direction into the Vorrich then the flow direction of the suspension 90 degrees in the machine direction is redirected.
  • the suspension then flows through three turbulence generating chambers 2 in the nozzle chambers 3, 4, 5 at the end of which they leave the device and on the Dewatering machine. Here it is between two sieves 24, 24 ', which run around two rollers 25, 25', are injected.
  • the two nozzle spaces 4, 5 become analogous to the embodiment in FIG. 1 separated by a wall 8, at the end of which is a one-piece, wedge-shaped Blade tip 12 made of stainless steel.
  • the partition 8 and in the assembled state, the lamella tip 12 forms a firm, non-adjustable separating element between the two nozzle spaces 4, 5.
  • the two nozzle spaces 3, 4 are separated by a partition 6, which is rotatably mounted about an axis 7.
  • a partition 6 which is rotatably mounted about an axis 7.
  • a one-piece lamella tip 12 Stainless steel, which is prestressed against the partition 6 by means of tie rods 11 becomes.
  • the partition 6 and the lamella tip 12 thus form a rigid Separating element which, however, is pivoted as a whole about the axis of rotation 7 can be. This swivel movement is carried out by a Eccentric shaft 15 that is regular across the machine width
  • the eccentricity e makes it possible to set the outlet gap height c des Nozzle space 4 between a minimum and maximum value and one Fixation of the same.
  • the outlet gap heights a and b of the two nozzle chambers 3 and 5 can also be between a minimum and Maximum value can be set and fixed.
  • the upper lip 18 or lower lip 18 'pivoted about the joints 14, 14'. Is performed this pivoting movement by an eccentric shaft 16, 16 ', which on the Machine width at regular intervals in bearings 17, 17 'on the rigid cover plates 20, 20 'of the device are supported.
  • the eccentricity e of the shafts 16, 16 ' enables the gap heights a to be adjusted and b between a minimum and maximum value.
  • the construction is designed so that even with constant turning the eccentric shafts 16, 16 'through a drive 22 the upper lip 18 and the lower lip 18 'never in contact with the lamella tips 12, 12 'come and thus no damage can occur. This also applies to all positions of the movable partition 6 Blade tip 12 '.
  • Fig. 2a shows a detail of the outlet gap in Fig. 2. You can see the different settings of the outlet gap heights a (nozzle area 3), b (nozzle area 5) and c (nozzle area 4).
  • FIG. 3 shows a section along line III-III in FIG. 2.
  • the eccentric shaft 16 is shown, the multiple over the Machine width is supported in bearings 17.
  • the invention is not restricted to the examples shown. It other types of lip adjustment can also be provided.

Description

Die Erfindung betrifft einen Zweischicht- oder Mehrschichtstoffauflauf zur Zufuhr einer Faserstoffsuspension auf eine Entwässerungseinrichtung, insbesondere für eine Tissue-Maschine, mit einer oder mehreren Lamellenspitzen zur Trennung der einzelnen Bereiche, wobei die Lamellenspitzen(n) als einteilige, keilförmige Lamellenspitze(n) (12, 12') aus Stahl vorgesehen ist bzw. sind.The invention relates to a two-layer or multilayer headbox for Supplying a fiber suspension to a dewatering device, especially for a tissue machine with one or more Lamella tips to separate the individual areas, the Lamellar tips (n) as one-piece, wedge-shaped lamellar tip (s) (12, 12 ') is or are made of steel.

Derartige Vorrichtungen, auch Stoffauflauf genannt, beeinflussen die Papierbildung und damit die Papierqualität wesentlich. Bei den bisherigen Stoffaufläufen ist eine Regelung der Fließgeschwindigkeit der Faserstoffsuspension praktisch nur über den Druck erreichbar. Bei Zwei- oder Mehrschichtstoffaufläufen, die eine Beeinflussung der Qualität der Papieroberfläche ermöglichen ist allerdings eine unterschiedliche Fließgeschwindigkeit, wie sie z.B. für unterschiedliche Qualitäten der Ober- und Unterseite erforderlich sind, nicht realisierbar. So zeigt z.B. die DE 196 52 983 (VOITH SULZER PAPIERMASCHINEN GMBH) ein Trennelement eines Mehrschichtstoffauflaufes, wobei hier neben einer Bajonettverbindung zwischen zwei Bauteilen des Trennelementes bei der offensichtlich bevorzugten Ausführungsform noch ein zusätzliches Spitzenbauteil vorgesehen ist. Die Befestigung im Gehäuse erfolgt vermutlich analog der DE 37 04 462 (SULZER-ESCHER-WYSS). Hier ist eine schwenkbare Trennwand und eine einstellbare Lippe vorgesehen.Such devices, also called headbox, affect the Paper formation and thus the paper quality is essential. With the previous ones Headboxes are a regulation of the flow rate of the fiber suspension practically only accessible via printing. With two or Multi-layer headboxes that affect the quality of the paper surface however, a different flow rate is possible, such as for different qualities of top and Bottom are required, not realizable. For example, DE 196 52 983 (VOITH SULZER PAPIERMASCHINEN GMBH) a separating element a multi-layer headbox, here in addition to one Bayonet connection between two components of the separating element in the obviously preferred embodiment yet another Tip component is provided. It is fastened in the housing probably analogous to DE 37 04 462 (SULZER-ESCHER-WYSS). Here is a swiveling partition and an adjustable lip are provided.

Die Einstellung durch den vorgesehenen Mechanismus ist jedoch nur sehr ungenau. Außerdem kann wegen der schwenkbaren Trennwand in den beiden Düsenräumen nur der gleiche Druck eingestellt werden. Die US 2,615,374 (MALKIN) beschreibt weiters einen sogenannten Stoffauflaufkasten mit freiem Auslauf der Faserstoffsuspension auf ein Sieb, wobei sich zwischen Sieb und flexibler Auslaufplatte ein Auslaufspalt ergibt. Die Auslaufplatte ist an einer Trägerwand montiert, wobei die gesamte Trägerwand mit Hilfe eines Exzenters sowohl (von der Sieboberfläche) angehoben als auch in horizontaler Richtung geschwungen werden kann. Die eigentliche Einstellung des Auslaufspaltes erfolgt mittels einer konventionellen Einstellvorrichtung und ist dementsprechend unpräzise. Außerdem kann ein derartiger Stoffauflaufkasten nicht bei einer Tissuemaschine eingesetzt werden, bei der die Faserstoffsuspension zwischen zwei Siebe eingedüst wird. Die DE 30 10 730 (J.M.VOITH GMBH) zeigt einen Mehrschichtstoffauflauf mit verstellbarem Trennelement, wobei neben einem konzentrisch angeordneten Lagerzapfen auch ein exzentrisch angeordneter Lagerzapfen vorgesehen ist. Auch hier ist eine exakte Einstellung des Spaltes nur schwer möglich.However, the adjustment by the mechanism provided is only very inaccurate. In addition, because of the pivotable partition in the only the same pressure can be set in both nozzle areas. The US 2,615,374 (MALKIN) also describes a so-called Headbox with free outlet of the fiber suspension on Sieve, with an outlet gap between the sieve and the flexible outlet plate results. The outlet plate is mounted on a support wall, the entire support wall using an eccentric both (from the Sieve surface) raised as well as in the horizontal direction can be swung. The actual setting of the outlet gap takes place by means of a conventional setting device and is accordingly imprecise. In addition, such a headbox not be used with a tissue machine where the Fibrous suspension is injected between two sieves. DE 30 10 730 (J.M.VOITH GMBH) shows a multi-layer headbox adjustable separator, being next to a concentric arranged journal also an eccentrically arranged Bearing journal is provided. Here too is an exact setting of the Splitting is difficult.

Ziel der Erfindung ist es daher, den Anwendungsbereich und die Steuerungsmöglichkeiten von Stoffaufläufen zu verbessern.The aim of the invention is therefore the scope and To improve control options for headboxes.

Die Erfindung ist daher dadurch gekennzeichnet, daß die Lamellenspitze(n) mittels eines Zugankers gegen die Trennwand der Zuführvorrichtung vorgespannt sind und die Lamellenspitze(n) und die Trennwand/wände somit ein starres Trennelement bilden. Damit ist es möglich eine stabile Trennung und damit auch konstante Einstellung der Auslaufspalthöhen auch bei unterschiedlichen Zulaufdrücken zu erzielen, so daß zwischen den einzelnen Suspensionsströmen eine Differenzgeschwindigkeit eingestellt werden kann. Durch die Vorspannung der Lamellenspitze(n) ist eine besonders stabile und dadurch exakte Einstellung der Auslaufspalthöhen möglich.The invention is therefore characterized in that the Lamella tip (s) by means of a tie rod against the partition of the Feed device are biased and the lamella tip (s) and the partition / walls form rigid separating element. This makes it possible to have a stable one Separation and therefore constant adjustment of the outlet gap heights to achieve even with different inlet pressures, so that between a differential speed for the individual suspension flows can be adjusted. Due to the preload of the slat tip (s) a particularly stable and therefore exact setting of the Outlet gap heights possible.

Eine günstige Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß der Abstand von Unterlippe und/oder Oberlippe zur Lamellenspitze einstellbar ist. Damit kann die Lamellenspitze feststehend und sehr stabil ausgeführt werden.A favorable embodiment of the invention is characterized in that that the distance from the lower lip and / or upper lip to the lamella tip is adjustable. This allows the slat tip to be fixed and very stable be carried out.

Eine vorteilhafte Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß zur Einstellung der Höhe des Auslaufspaltes zwischen einem Minimal- und Maximalwert eine Exzenterwelle vorgesehen ist. Durch die Einstellung der Höhe des Auslaufspaltes läßt sich in einfacher Weise die Fließgeschwindigkeit des Suspensionsstromes entsprechend den Erfordernissen an das Endprodukt anpassen. Die Verwendung eines Exzenters gewährleistet eine sehr genaue Einstellung der Auslaufspalthöhe.An advantageous embodiment of the invention is characterized in that that to adjust the height of the outlet gap between a minimum and maximum value an eccentric shaft is provided. Through the Setting the height of the outlet gap can be done in a simple manner Flow rate of the suspension stream according to the Adapt requirements to the end product. The use of a Eccentric ensures a very precise adjustment of the outlet gap height.

Eine günstige Weiterbildung der Erfindung ist dadurch gekennzeichnet, daß die Oberlippe mittels Exzenter verstellbar ist, wobei auch alternativ oder zusätzlich die Unterlippe mittels Exzenter verstellbar sein kann. Die Einstellung von Ober- und/oder Unterlippe ermöglicht je nach Ausführung als Zwei- oder Mehrschichtstoffauflauf die optimalen Bedingungen zur Regulierung der Fließgeschwindigkeit der einzelnen Schichten.A favorable further development of the invention is characterized in that that the upper lip is adjustable by means of an eccentric, and alternatively or the lower lip can also be adjustable by means of an eccentric. The Adjustment of upper and / or lower lip enables depending on the version as a two- or multi-layer headbox the ideal conditions for Regulation of the flow rate of the individual layers.

Eine günstige Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß eine Trennwand - Lamellenspitzen - Einheit mittels Exzenter verstellbar ist.A favorable embodiment of the invention is characterized in that that a partition - slat tip unit adjustable by means of an eccentric is.

Eine vorteilhafte Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß die Exzenterwelle über die Maschinenbreite mehrfach abgestützt ist, wobei die Abstützung in gleichmäßigen Abständen erfolgen kann.An advantageous embodiment of the invention is characterized in that that the eccentric shaft is supported several times over the machine width, the support can take place at regular intervals.

Eine günstige Weiterbildung der Erfindung ist dadurch gekennzeichnet, daß die Exzenterwelle mit einem Getriebemotor verbunden ist. Damit kann auch während des Betriebes der Papiermaschine die Auslaufhöhe und damit die Fließgeschwindigkeit der Faserstoffsuspension entsprechend eingestellt bzw. geregelt werden. A favorable further development of the invention is characterized in that that the eccentric shaft is connected to a geared motor. In order to the outlet height can also be adjusted during the operation of the paper machine and thus the flow rate of the fiber suspension accordingly be adjusted or regulated.

Die Erfindung wird nun anhand der Zeichnungen beispieihaft beschrieben, wobei Fig. 1 einen Zweischichtstoffauflauf gemäß der Erfindung, Fig. 1a ein Detail in Fig. 1, Fig. 2 einen Dreischichtstoffauflauf, Fig. 2a ein Detail in Fig. 2, Fig. 3 einen Schnitt gemäß Linie III-III in Fig. 2 darstellt.The invention will now be described with reference to the drawings, 1 shows a two-layer headbox according to the invention, FIG. 1a a detail in Fig. 1, Fig. 2 shows a three-layer headbox, Fig. 2a shows a detail in Fig. 2, Fig. 3 shows a section along line III-III in Fig. 2.

Fig. 1 stellt eine Vorrichtung zur Zufuhr von Faserstoffsuspensionen auf eine Entwässerungseinrichtung, insbesondere für eine Tissue-Maschine, in Form eines Zweischichtstoffauflaufes dar. Dabei wird die Suspension gleichzeitig über zwei Kanäle 1 quer zur Maschinenrichtung eingespeist, dann wird die Fließrichtung der Suspension um 90 Grad in Maschinenrichtung umgelenkt. In weiterer Folge wird die Suspension durch zwei Turbulenzerzeugerkammern 2 in die als Düsenräume ausgeführten Auslaufkammern 3, 4 geführt, wobei sie an deren Ende die Vorrichtung verläßt und auf die Entwässerungseinrichtung auftrifft. Die beiden Düsenräume 3, 4 werden durch eine Wand 8 getrennt, die mittels durchgebohrter Schrauben 9 gegen den Tragkörper 10 vorgespannt wird.Fig. 1 sets up a device for supplying fiber suspensions a drainage device, in particular for a tissue machine, in the form of a two-layer headbox. The suspension fed simultaneously via two channels 1 across the machine direction, then the flow direction of the suspension is 90 degrees in Machine direction redirected. Subsequently, the suspension through two turbulence generating chambers 2 into the nozzle spaces run out discharge chambers 3, 4, at the end of which Leaves device and strikes the drainage device. The two nozzle spaces 3, 4 are separated by a wall 8, which means cannulated screws 9 is biased against the support body 10.

Am auslaufseitigen Ende der Trennwand 8 befindet sich eine einteilige, keilförmige Lamellenspitze 12 aus Edelstahl, die mittels Zuganker 13 gegen die Trennwand 8 vorgespannt wird. Die Trennwand 8 und die Lamellenspitze 12 bilden im zusammengebauten Zustand ein festes Trennelement zwischen den beiden Düsenräumen 3, 4. Durch seine Vorspannung gegenüber dem Tragkörper 10 wird es möglich unterschiedliche Betriebsdrücke (bis zu 0,5 bar) und dadurch unterschiedliche Fließgeschwindigkeiten der Faserstoffsuspension in beiden Schichten einzusetzen.At the outlet end of the partition 8 there is a one-piece, Wedge-shaped lamellar tip 12 made of stainless steel, which by means of tie rods 13 is biased against the partition 8. The partition 8 and the Lamellar tip 12 form a solid in the assembled state Separating element between the two nozzle spaces 3, 4. By its Biasing against the support body 10, it becomes possible different operating pressures (up to 0.5 bar) and thereby different flow rates of the fiber suspension in to use both layers.

Dazu ist es notwendig die Auslaufspalthöhen a bzw. b der beiden Düsenkammem 3, 4 unterschiedlich einzustellen. Dazu werden die Oberlippe 18 bzw. Unterlippe 18' um die Gelenke 14, 14' geschwenkt. Ausgeführt wird diese Schwenkbewegung durch eine Exzenterwelle 16, 16', die über die Maschinenbreite, in regelmäßigen Abständen in Lagern 17, 17' auf die starren Deckplatten 20, 20' der Vorrichtung abgestützt sind. Die Exzentrizität e der Wellen ermöglicht eine Einstellung der Spalthöhen a bzw. b zwischen einem Minimal- und Maximalwert.This requires the outlet gap heights a and b of the two nozzle chambers 3, 4 to be set differently. For this, the upper lip 18 or lower lip 18 'pivoted about the joints 14, 14'. Is performed this pivoting movement by an eccentric shaft 16, 16 ', which on the Machine width, at regular intervals in bearings 17, 17 'on the rigid cover plates 20, 20 'of the device are supported. The eccentricity e of the shafts enables gap heights a and b to be set between a minimum and maximum value.

Die Konstruktion ist derart ausgelegt, daß auch bei ständigem Weiterdrehen der Exzenterwelle 16, 16' durch einen Antrieb 22 die Oberlippe 18 und die Unterlippe 18' niemals in Kontakt mit der Lamellenspitze 12 kommen und somit auch keine Beschädigungen auftreten können.The construction is designed so that even with constant turning the eccentric shaft 16, 16 'by a drive 22, the upper lip 18th and the lower lip 18 'never in contact with the blade tip 12 come and thus no damage can occur.

Durch diese Ober- und Unterlippenverstellung über Exzenterwellen 16, 16' ist der Konturwinkel α beim Zweischichtstoffauflauf kleiner als bei herkömmlichen Verstellungen über Getriebemotore. Dies ermöglicht eine beträchtliche Verkürzung der freien Strahllänge f des Stoffstrahls vom Austritt aus dem Stoffauflauf zum Kontakt mit den über Walzen 25, 25' laufenden Siebe oder Filze 24, 24'. Dies führt in weiterer Folge zu einer besseren Stabilität des freien Strahls und damit zu einer Verbesserung der Papierqualität.Through this upper and lower lip adjustment via eccentric shafts 16, 16 ' the contour angle α is smaller in the two-layer headbox than in conventional ones Adjustments via geared motors. This enables considerable Shortening the free jet length f of the material jet from the outlet from the headbox for contact with the rollers 25, 25 ' running sieves or felts 24, 24 '. This subsequently leads to a better stability of the free jet and thus an improvement the paper quality.

Durch die starre Lamellenspitze 12 und der dadurch gegebenen Möglichkeit in den beiden Kammern (Düsenräumen) 3, 4 verschiedene Fließgeschwindigkeiten der Suspension vorzusehen, ergibt sich eine Steigerung der Papierqualität bei der Betriebsart "gleiche Stoffsorten" in beiden Kammern bzw. eine sehr gute Trennung (Abdeckung) der Schichten bei der Betriebsart "verschiedene Stoffsorten" in beiden Kammern im Vergleich zu Einschichtstoffaufläufen bzw. Mehrschichtstoffaufläufen mit flexiblen Trennelementen am Auslauf der Düsenräume, die keine Differenz zischen den beiden Stoffschichten erlauben.Due to the rigid slat tip 12 and the resulting possibility in the two chambers (nozzle rooms) 3, 4 different flow rates to provide the suspension results in a Increase in paper quality in the "same types of fabric" mode in two chambers or a very good separation (cover) of the Layers in the "different types of fabric" mode in both Chambers compared to single-layer headboxes or multi-layer headboxes with flexible dividers at the outlet of the nozzle areas, that allow no difference between the two layers of fabric.

Fig. 1a zeigt ein Detail des Auslaufspaltes in Fig. 1. Es ist hier deutlich die unterschiedliche Größe der Auslaufspalte a (Düsenraum 3) und b (Düsenraum 4) erkennbar.Fig. 1a shows a detail of the outlet gap in Fig. 1. It is clearly the different size of the outlet gaps a (nozzle space 3) and b (Nozzle area 4) recognizable.

Fig. 2 zeigt nun einen Dreischichtstoffauflauf, wobei die Suspension gleichzeitig über drei Kanäle 1 quer zur Maschinenrichtung in die Vorrich tung, dann die Fließrichtung der Suspension um 90 Grad in Maschinenrichtung umgelenkt wird. Die Suspension fließt dann durch drei Turbulenzerzeugungskammem 2 in die Auslaufkammern genannten Düsenräume 3, 4, 5 an deren Ende sie die Vorrichtung verlassen und auf die Entwässerungsmaschine auftreffen. Hier wird sie zwischen zwei Siebe 24, 24', die um zwei Walzen 25, 25' laufen, eingespritzt.Fig. 2 now shows a three-layer headbox, the suspension Simultaneously via three channels 1 across the machine direction into the Vorrich then the flow direction of the suspension 90 degrees in the machine direction is redirected. The suspension then flows through three turbulence generating chambers 2 in the nozzle chambers 3, 4, 5 at the end of which they leave the device and on the Dewatering machine. Here it is between two sieves 24, 24 ', which run around two rollers 25, 25', are injected.

Die beiden Düsenräume 4, 5 werden analog zur Ausführung in Fig. 1 durch eine Wand 8 getrennt, an deren Ende sich eine einteilige, keilförmige Lamellenspitze 12 aus Edelstahl befindet. Die Trennwand 8 und die Lamellenspitze 12 bilden in zusammengebautem Zustand ein festes, nicht verstellbares Trennelement zwischen den beiden Düsenräumen 4, 5.The two nozzle spaces 4, 5 become analogous to the embodiment in FIG. 1 separated by a wall 8, at the end of which is a one-piece, wedge-shaped Blade tip 12 made of stainless steel. The partition 8 and in the assembled state, the lamella tip 12 forms a firm, non-adjustable separating element between the two nozzle spaces 4, 5.

Durch seine Vorspannung gegenüber dem Tragkörper 10 wird es ermöglicht, unterschiede bis zu 0,5 bar und dadurch unterschiedliche Fließgeschwindigkeiten der Faserstoffsuspensionen in beiden Schichten zu erzielen.Due to its bias against the support body 10 it is enables differences up to 0.5 bar and therefore different Flow rates of the fiber suspensions in both layers to achieve.

Die beiden Düsenräume 3, 4 werden durch eine Trennwand 6 getrennt, die um eine Achse 7 drehbar gelagert ist. Am auslaufseitigen Ende der Trennwand 6 befindet sich ebenfalls eine einteilige Lamellenspitze 12 aus Edelstahl, die mittels Zuganker 11 gegen die Trennwand 6 vorgespannt wird. Die Trennwand 6 und die Lamellenspitze 12 bilden somit ein starres Trennelement, das jedoch als ganzes um die Drehachse 7 geschwenkt werden kann. Ausgeführt wird diese Schwenkbewegung durch eine Exzenterwelle 15, die über die Maschinenbreite in regelmäßigenThe two nozzle spaces 3, 4 are separated by a partition 6, which is rotatably mounted about an axis 7. At the outlet end of the Partition 6 is also a one-piece lamella tip 12 Stainless steel, which is prestressed against the partition 6 by means of tie rods 11 becomes. The partition 6 and the lamella tip 12 thus form a rigid Separating element which, however, is pivoted as a whole about the axis of rotation 7 can be. This swivel movement is carried out by a Eccentric shaft 15 that is regular across the machine width

Abständen in Lagern 19 auf die starre Hinterwand 23 der Vorrichtung abgestützt sind.Distances in bearings 19 supported on the rigid rear wall 23 of the device are.

Die Exzentrizität e ermöglicht eine Einstellung der Auslaufspalthöhe c des Düsenraumes 4 zwischen einem Minimal- und Maximalwert und eine Fixierung derselben. Die Auslaufspalthöhen a und b der beiden Düsenkammern 3 und 5 können ebenfalls zwischen einem Minimal- und Maximalwert eingestellt und fixiert werden. Dazu werden die Oberlippe 18 bzw. Unterlippe 18' um die Gelenke 14, 14' geschwenkt. Ausgeführt wird diese Schwenkbewegung durch eine Exzenterwelle 16, 16', die über die Maschinenbreite in regelmäßigen Abständen in Lagern 17, 17' auf die starren Deckplatten 20, 20' der Vorrichtung abgestützt sind. Die Exzentrizität e der Wellen 16, 16' ermöglicht eine Einstellung der Spalthöhen a und b zwischen einem Minimal- und Maximalwert.The eccentricity e makes it possible to set the outlet gap height c des Nozzle space 4 between a minimum and maximum value and one Fixation of the same. The outlet gap heights a and b of the two nozzle chambers 3 and 5 can also be between a minimum and Maximum value can be set and fixed. For this, the upper lip 18 or lower lip 18 'pivoted about the joints 14, 14'. Is performed this pivoting movement by an eccentric shaft 16, 16 ', which on the Machine width at regular intervals in bearings 17, 17 'on the rigid cover plates 20, 20 'of the device are supported. The eccentricity e of the shafts 16, 16 'enables the gap heights a to be adjusted and b between a minimum and maximum value.

Die Konstruktion ist derart ausgelegt, daß auch bei ständigem Weiterdrehen der Exzenterwellen 16, 16' durch einen Antrieb 22 die Oberlippe 18 und die Unterlippe 18' niemals in Kontakt mit den Lamellenspitzen 12, 12' kommen und somit auch keine Beschädigungen auftreten können. Dies gilt auch für alle Positionen der beweglichen Trennwand 6 mit Lamellenspitze 12'.The construction is designed so that even with constant turning the eccentric shafts 16, 16 'through a drive 22 the upper lip 18 and the lower lip 18 'never in contact with the lamella tips 12, 12 'come and thus no damage can occur. This also applies to all positions of the movable partition 6 Blade tip 12 '.

Durch diese Ober- und Unterlippenverstellung über Exzenterwellen 16, 16' ist der Konturwinkel β beim Dreischichtstoffauflauf kleiner als bei herkömmlichen Verstellungen über Getriebemotore. Dies ermöglicht ebenfalls eine beträchtliche Verkürzung der freien Strahllänge f des Stoffstrahls vom Austritt aus dem Stoffauflauf zum Kontakt mit den über Walzen 25, 25' laufenden Siebe oder Filze 24, 24'. Dies führt in weiterer Folge zu einer besseren Stabilität des freien Strahls und damit zu einer Verbesserung der Papierqualität.Through this upper and lower lip adjustment via eccentric shafts 16, 16 ' the contour angle β in the three-layer headbox is smaller than in conventional ones Adjustments via geared motors. This also enables a considerable reduction in the free jet length f of the material jet from the exit from the headbox to the contact with the rollers 25, 25 'running screens or felts 24, 24'. This subsequently leads to a better stability of the free jet and thus an improvement the paper quality.

Somit ist es ebenfalls möglich, den Dreischichtstoffauflauf mit unterschiedlichen Fließgeschwindigkeiten in der Innen- bzw. in den beiden Außenlagen zu betreiben.It is therefore also possible to use different three-layer headboxes Flow velocities in the interior or in the two To operate outside locations.

Zu den bereits genannten Vorteilen beim Zweischichtstoffauflauf wie Papierqualität, Abdeckung und Lagentrennung kommt beim Dreischichtstoffauflauf noch hinzu, daß in der Mittelschicht Stoffarten minderer Qualität eingesetzt werden können, ohne daß die Papierqualität beeinträchtigt wird. Regarding the advantages already mentioned with the two-layer headbox such as Paper quality, coverage and layer separation come with the three-layer headbox in addition, that in the middle class less species Quality can be used without affecting the paper quality becomes.

Fig. 2a zeigt ein Detail des Auslaufspaltes in Fig. 2. Man sieht die unterschiedlichen Einstellungen der Auslaufspalthöhen a (Düsenraum 3), b (Düsenraum 5) und c (Düsenraum 4).Fig. 2a shows a detail of the outlet gap in Fig. 2. You can see the different settings of the outlet gap heights a (nozzle area 3), b (nozzle area 5) and c (nozzle area 4).

Fig. 3 zeigt einen Schnitt gemäß Linie III-III in in Fig. 2. Hier ist die Exzenterwelle 16 dargestellt, die mehrfach über die Maschinenbreite in Lagern 17 abgestützt wird. Auch ist ein Getriebemotor 22 gezeigt, mit dem die Spalthöhe des Auslaufspaltes eingestellt werden kann.FIG. 3 shows a section along line III-III in FIG. 2. Here, the eccentric shaft 16 is shown, the multiple over the Machine width is supported in bearings 17. There is also a gear motor 22 shown, with which the gap height of the outlet gap can be adjusted can.

Die Erfindung ist nicht auf die dargestellten Beispiele beschränkt. Es können auch andere Arten der Lippenverstellung vorgesehen sein.The invention is not restricted to the examples shown. It other types of lip adjustment can also be provided.

Claims (9)

  1. Two-layer or multiple-layer headbox for feeding a pulp suspension to a dewatering installation, particularly for a tissue machine, having one or several partitions with one lamella tip each for separation of the individual nozzle areas (3, 4, 5), with the lamella tip(s) being designed as one-piece, wedge-shaped lamella tip(s) (12, 12') made of steel, characterized by the lamella tip(s) (12, 12') being prestressed against the appropriate partition (6, 8) by means of a tie rod (11, 13) and by the lamella tip(s) and the partition(s) thus forming a rigid separating element.
  2. Device according to Claim 1, characterized by the spacing of the bottom lip (18') and/or the top lip (18) to the lamella tip (12, 12') being adjustable.
  3. Device according to one of Claims 1 or 2, characterized by an eccentric shaft (15, 16, 16') being provided to set the slice gap to between a minimum and a maximum height.
  4. Device according to one of Claims 1 to 3, characterized by the top lip (18) being adjustable using an eccentric (16).
  5. Device according to one of Claims 1 to 4, characterized by the bottom lip (18') being adjustable using an eccentric (16').
  6. Device according to one of Claims 1 to 5, characterized by a partition (6) and lamella tip (12') unit being adjustable by means of an eccentric (15).
  7. Device according to one of Claims 1 to 6, characterized by the eccentric shaft (15, 16, 16') being supported at several points across the machine width.
  8. Device according to Claim 7, characterized by the eccentric shaft (15, 16, 16') being supported at regular intervals.
  9. Device according to one of Claims 1 to 8, characterized by the eccentric shaft (15, 16, 16') being connected to a gear motor (22).
EP98124784A 1998-02-05 1998-12-29 Apparatus for feeding a fibre suspension on a dewatering device Expired - Lifetime EP0936301B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0020698A AT406171B (en) 1998-02-05 1998-02-05 DEVICE FOR SUPPLYING A FIBER FIBER SUSPENSION TO A DRAINAGE DEVICE
AT20698 1998-02-05

Publications (3)

Publication Number Publication Date
EP0936301A2 EP0936301A2 (en) 1999-08-18
EP0936301A3 EP0936301A3 (en) 2000-02-23
EP0936301B1 true EP0936301B1 (en) 2003-11-26

Family

ID=3484304

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98124784A Expired - Lifetime EP0936301B1 (en) 1998-02-05 1998-12-29 Apparatus for feeding a fibre suspension on a dewatering device

Country Status (6)

Country Link
US (1) US6368464B1 (en)
EP (1) EP0936301B1 (en)
AT (1) AT406171B (en)
BR (1) BR9900531A (en)
DE (1) DE59810270D1 (en)
ES (1) ES2210654T3 (en)

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2615374A (en) * 1948-10-04 1952-10-28 Dominion Eng Works Ltd Slice assembly for papermaking machines
SE7707981L (en) * 1976-12-02 1978-06-03 Ahlstroem Dev Gmbh DEVICE FOR IMPACTING A RAILWAY MATERIAL
FI58364C (en) * 1977-07-13 1981-01-12 Tampella Oy Ab PROCEDURE FOR BANFORMING MACHINES FOR FRAMSTAELLNING AV EN TVAO- ELLER FLERSKIKTIG FIBERBANA
DE3010730C2 (en) * 1980-03-20 1983-01-05 J.M. Voith Gmbh, 7920 Heidenheim Headbox for a paper machine
DE3348218C2 (en) * 1983-06-09 1990-05-10 Sulzer-Escher Wyss Gmbh, 7980 Ravensburg, De
CH672515A5 (en) * 1987-02-02 1989-11-30 Escher Wyss Gmbh
DE3807629A1 (en) * 1988-03-09 1989-09-21 Escher Wyss Gmbh DEVICE FOR HOLDING A SEPARATING SLAT
ATE222971T1 (en) * 1994-04-29 2002-09-15 Voith Paper Patent Gmbh MULTI-LAYER HEADBOX
DE4440079C2 (en) * 1994-11-10 1997-10-02 Voith Sulzer Papiermasch Gmbh Multi-layer headbox
DE19652983A1 (en) * 1996-12-19 1997-05-28 Voith Sulzer Papiermasch Gmbh Separating element for paper machine breast box
DE19652982A1 (en) * 1996-12-19 1997-05-22 Voith Sulzer Papiermasch Gmbh Separator blade flush-fit connector in paper pulp multilayer head box

Also Published As

Publication number Publication date
ES2210654T3 (en) 2004-07-01
EP0936301A2 (en) 1999-08-18
AT406171B (en) 2000-03-27
BR9900531A (en) 2000-02-22
ATA20698A (en) 1999-07-15
US6368464B1 (en) 2002-04-09
DE59810270D1 (en) 2004-01-08
EP0936301A3 (en) 2000-02-23

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