EP0936301A2 - Apparatus for feeding a fibre suspension on a dewatering device - Google Patents

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

Info

Publication number
EP0936301A2
EP0936301A2 EP98124784A EP98124784A EP0936301A2 EP 0936301 A2 EP0936301 A2 EP 0936301A2 EP 98124784 A EP98124784 A EP 98124784A EP 98124784 A EP98124784 A EP 98124784A EP 0936301 A2 EP0936301 A2 EP 0936301A2
Authority
EP
European Patent Office
Prior art keywords
eccentric
eccentric shaft
adjustable
partition
dividing wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP98124784A
Other languages
German (de)
French (fr)
Other versions
EP0936301B1 (en
EP0936301A3 (en
Inventor
Wilhelm Dipl.-Ing. Mausser
Manfred Ing. Schmid
Walter Writzl
Rudolf Dipl.-Ing. Greimel
Harald Weigant
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Andritz AG
Original Assignee
Andritz Patentverwaltungs GmbH
Andritz AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Andritz Patentverwaltungs GmbH, Andritz AG filed Critical Andritz Patentverwaltungs GmbH
Publication of EP0936301A2 publication Critical patent/EP0936301A2/en
Publication of EP0936301A3 publication Critical patent/EP0936301A3/en
Application granted granted Critical
Publication of EP0936301B1 publication Critical patent/EP0936301B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • 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 device for supplying a fiber suspension to a dewatering device, in particular for a tissue machine.
  • Devices of this type also called headbox
  • regulation of the flow rate of the fiber suspension can practically only be achieved via the pressure.
  • a different flow rate such as is required, for example, for different top and bottom qualities, cannot be achieved.
  • the aim of the invention is therefore to improve the field of application and the control options for headboxes.
  • the invention is therefore characterized in that one or more one-piece, wedge-shaped lamella tip (s) made of steel is or are provided for a two-layer or multi-layer headbox for separating the individual areas.
  • This makes it possible to achieve a stable separation and thus also a constant setting of the outlet gap heights even at different inlet pressures, so that a differential speed can be set between the individual suspension flows.
  • An advantageous development of the invention is characterized in that the lamella tip (s) are prestressed against the partition of the feed device by means of a tie rod. A particularly stable and therefore exact adjustment of the outlet gap heights is possible.
  • a favorable embodiment of the invention is characterized in that the distance from the lower lip and / or upper lip to the slat tip is adjustable.
  • An advantageous embodiment of the invention is characterized in that an eccentric shaft is provided for adjusting the height of the outlet gap between a minimum and maximum value. By adjusting the height of the outlet gap, the flow rate of the suspension stream can be adapted to the end product in accordance with the requirements.
  • the use of an eccentric ensures a very precise adjustment of the outlet gap height.
  • a favorable further development of the invention is characterized in that the upper lip can be adjusted by means of an eccentric, whereby alternatively or additionally the lower lip can be adjusted by means of an eccentric. The adjustment of the upper and / or lower lip enables the optimal conditions for regulating the flow rate of the individual layers, depending on the design as a two- or multi-layer headbox.
  • a favorable embodiment of the invention is characterized in that a partition-lamella tip unit can be adjusted by means of an eccentric.
  • An advantageous embodiment of the invention is characterized in that the eccentric shaft is supported several times over the width of the machine, wherein the support can take place at regular intervals.
  • a favorable development of the invention is characterized in that the eccentric shaft is connected to a geared motor. This means that the outlet height and thus the flow rate of the fiber suspension can be adjusted or regulated accordingly, even during operation of the paper machine.
  • FIG. 1 shows a device for supplying fiber suspensions to a dewatering device, in particular for a tissue machine, in the form of a two-layer headbox.
  • the suspension is fed in simultaneously via two channels 1 transversely to the machine direction, then the flow direction of the suspension is 90 degrees redirected in the machine direction.
  • the suspension is then passed through two turbulence generator chambers 2 into the outlet chambers 3, 4 designed as nozzle spaces, at the end of which it leaves the device and strikes the dewatering device.
  • the two nozzle spaces 3, 4 are separated by a wall 8 which is prestressed against the supporting body 10 by means of drilled screws 9.
  • the partition 8 At the outlet end of the partition 8 there is a one-piece, wedge-shaped lamella tip 12 made of stainless steel, which is prestressed against the partition 8 by means of tie rods 13.
  • the partition 8 and the lamella tip 12 form a solid separating element between the two nozzle spaces 3, 4 in the assembled state. Due to its pretensioning relative to the supporting body 10, different operating pressures (up to 0.5 bar) and thus different flow rates of the fiber suspension in both are possible Use layers. For this purpose, it is necessary to set the outlet gap heights a and b of the two nozzle chambers 3, 4 differently. For this purpose, the upper lip 18 or lower lip 18 'are pivoted about the joints 14, 14'.
  • This pivoting movement is carried out by an eccentric shaft 16, 16 ', which are supported over the machine width, at regular intervals in bearings 17, 17' on the rigid cover plates 20, 20 'of the device.
  • the eccentricity e of the shafts allows the gap heights a and b to be set between a minimum and a maximum value.
  • the construction is designed in such a way that even with constant rotation of the eccentric shaft 16, 16 'by a drive 22, the upper lip 18 and the lower lip 18' never come into contact with the lamella tip 12 and therefore no damage can occur.
  • the contour angle ⁇ in the two-layer headbox is smaller than in the case of conventional adjustments using geared motors.
  • FIG. 1a shows a detail of the outlet gap in FIG. 1. The different sizes of the outlet gaps a (nozzle space 3) and b (nozzle space 4) can be clearly seen here.
  • the suspension simultaneously via three channels 1 transversely to the machine direction in the Vorrich device, then the flow direction of the suspension is deflected by 90 degrees in the machine direction.
  • the suspension then flows through three turbulence generating chambers 2 into the nozzle chambers 3, 4, 5 called outlet chambers, at the end of which they leave the device and hit the dewatering machine.
  • it is injected between two screens 24, 24 'which run around two rollers 25, 25'.
  • the two nozzle spaces 4, 5 are separated by a wall 8, at the end of which there is a one-piece, wedge-shaped lamella tip 12 made of stainless steel.
  • the partition 8 and the lamella tip 12 form a firm, non-adjustable separating element between the two nozzle spaces 4, 5. Its prestressing relative to the support body 10 enables differences of up to 0.5 bar and thus different flow rates of the fiber suspensions in to achieve two layers.
  • 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.
  • At the outlet-side end of the partition 6 there is also a one-piece lamella tip 12 'made of stainless steel, which is prestressed against the partition 6 by means of tie rods 11.
  • the partition 6 and the lamella tip 12 'thus form a rigid separating element which, however, can be pivoted as a whole about the axis of rotation 7.
  • This pivoting movement is carried out by an eccentric shaft 15, which are supported at regular intervals in bearings 19 on the rigid rear wall 23 of the device over the machine width.
  • the eccentricity e makes it possible to set the outlet gap height c of the nozzle chamber 4 between a minimum and a maximum value and to fix it.
  • the outlet gap heights a and b of the two nozzle chambers 3 and 5 can also be set and fixed between a minimum and maximum value.
  • the upper lip 18 or lower lip 18 ' are pivoted about the joints 14, 14'.
  • This pivoting movement is carried out by an eccentric shaft 1, 16 ', which are supported over the machine width at regular intervals in bearings 17, 17' on the rigid cover plates 20, 20 'of the device.
  • the eccentricity e of the shafts 16, 16 ' enables the gap heights a and b to be set between a minimum and a maximum value.
  • the construction is designed in such a way that even with constant rotation of the eccentric shafts 16, 16 'by a drive 22, the upper lip 18 and the lower lip 18' never come into contact with the lamella tips 12, 12 'and therefore no damage can occur. This also applies to all positions of the movable partition 6 with lamella tip 12 '.
  • the contour angle ⁇ in the three-layer headbox is smaller than in the case of conventional adjustments using geared motors.
  • FIG. 2a shows a detail of the outlet gap in FIG. 2.
  • the different settings of the outlet gap heights a (nozzle chamber 3), b (nozzle chamber 5) and c (nozzle chamber 4) can be seen.
  • Fig. 3 shows a section along line III-III in Fig. 1 and analogously in Fig. 2.
  • the eccentric shaft 16 is shown, which is supported several times over the machine width in bearings 17.
  • a geared motor 22 is also shown, with which the gap height of the outlet gap can be adjusted.
  • the invention is not restricted to the examples shown. Other types of lip adjustment can also be provided.

Landscapes

  • Paper (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Abstract

The stock inlet to deliver fiber pulp to the water removal section of a papermaking machine, and especially for tissue paper, has at least one dividing wall (8) for a stock inlet, with two or more layers. A rigid and one-piece steel wedge-shaped blade (12) is bonded to the dividing wall. The blade is tensed against the dividing wall (8) by a tie rod (13). An eccentric adjusts the setting of the dividing wall and blade unit.

Description

Die Erfindung betrifft eine Vorrichtung zur Zufuhr einer Faserstoffsuspension auf eine Entwässerungseinrichtung, insbesondere für eine Tissue-Maschine.
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.
Ziel der Erfindung ist es daher, den Anwendungsbereich und die Steuerungsmöglichkeiten von Stoffaufläufen zu verbessern.
Die Erfindung ist daher dadurch gekennzeichnet, daß für einen Zweischicht- oder Mehrschichtstoffauflauf zur Trennung der einzelnen Bereiche eine bzw. mehrere einteilige, keilförmige Lamellenspitze(n) aus Stahl vorgesehen ist bzw. sind. 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.
Eine vorteilhatte Weiterbildung der Erfindung ist dadurch gekennzeichnet, daß die Lamellenspitze(n) mittels eines Zugankers gegen die Trennwand der Zuführvorrichtung vorgespannt sind. Somit ist eine besonders stabile und dadurch exakte Einstellung der Auslaufspalthöhen möglich.
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.
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.
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.
Eine günstige Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß eine Trennwand - Lamellenspitzen - Einheit mittels Exzenter verstellbar ist.
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.
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.
Die Erfindung wird nun anhand der Zeichnungen beispielhaft 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.
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. 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.
Dazu ist es notwendig die Auslaufspalthöhen a bzw. b der beiden Düsenkammern 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.
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.
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.
Durch die starre Lamellenspitse 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

Figure 00040001
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.
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. 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 Turbulenzerzeugungskammern 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.
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. 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.
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 regelmäßigen Abständen in Lagern 19 auf die starre Hinterwand 23 der Vorrichtung abgestützt sind.
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 1, 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.
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'.
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.
Somit ist es ebenfalls möglich, den Dreischichtstoffauflauf mit unterschiedlichen Fließgeschwindigkeiten in der Innen- bzw. in den beiden Außenlagen zu betreiben.
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.
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).The invention relates to a device for supplying a fiber suspension to a dewatering device, in particular for a tissue machine.
Devices of this type, also called headbox, have a significant influence on paper formation and thus on paper quality. In the previous headboxes, regulation of the flow rate of the fiber suspension can practically only be achieved via the pressure. In the case of two- or multi-layer headboxes which enable the quality of the paper surface to be influenced, however, a different flow rate, such as is required, for example, for different top and bottom qualities, cannot be achieved.
The aim of the invention is therefore to improve the field of application and the control options for headboxes.
The invention is therefore characterized in that one or more one-piece, wedge-shaped lamella tip (s) made of steel is or are provided for a two-layer or multi-layer headbox for separating the individual areas. This makes it possible to achieve a stable separation and thus also a constant setting of the outlet gap heights even at different inlet pressures, so that a differential speed can be set between the individual suspension flows.
An advantageous development of the invention is characterized in that the lamella tip (s) are prestressed against the partition of the feed device by means of a tie rod. A particularly stable and therefore exact adjustment of the outlet gap heights is possible.
A favorable embodiment of the invention is characterized in that the distance from the lower lip and / or upper lip to the slat tip is adjustable. This allows the slat tip to be fixed and very stable.
An advantageous embodiment of the invention is characterized in that an eccentric shaft is provided for adjusting the height of the outlet gap between a minimum and maximum value. By adjusting the height of the outlet gap, the flow rate of the suspension stream can be adapted to the end product in accordance with the requirements. The use of an eccentric ensures a very precise adjustment of the outlet gap height.
A favorable further development of the invention is characterized in that the upper lip can be adjusted by means of an eccentric, whereby alternatively or additionally the lower lip can be adjusted by means of an eccentric. The adjustment of the upper and / or lower lip enables the optimal conditions for regulating the flow rate of the individual layers, depending on the design as a two- or multi-layer headbox.
A favorable embodiment of the invention is characterized in that a partition-lamella tip unit can be adjusted by means of an eccentric.
An advantageous embodiment of the invention is characterized in that the eccentric shaft is supported several times over the width of the machine, wherein the support can take place at regular intervals.
A favorable development of the invention is characterized in that the eccentric shaft is connected to a geared motor. This means that the outlet height and thus the flow rate of the fiber suspension can be adjusted or regulated accordingly, even during operation of the paper machine.
The invention will now be described by way of example with reference to the drawings, in which Fig. 1 shows a two-layer headbox according to the invention, Fig. 1a shows a detail in Fig. 1, Fig. 2 shows a three-layer headbox, Fig. 2a shows a detail in Fig. 2, Fig. 3 shows a detail Section along line III-III in Fig. 2 represents.
1 shows a device for supplying fiber suspensions to a dewatering device, in particular for a tissue machine, in the form of a two-layer headbox. The suspension is fed in simultaneously via two channels 1 transversely to the machine direction, then the flow direction of the suspension is 90 degrees redirected in the machine direction. The suspension is then passed through two turbulence generator chambers 2 into the outlet chambers 3, 4 designed as nozzle spaces, at the end of which it leaves the device and strikes the dewatering device. The two nozzle spaces 3, 4 are separated by a wall 8 which is prestressed against the supporting body 10 by means of drilled screws 9. At the outlet end of the partition 8 there is a one-piece, wedge-shaped lamella tip 12 made of stainless steel, which is prestressed against the partition 8 by means of tie rods 13. The partition 8 and the lamella tip 12 form a solid separating element between the two nozzle spaces 3, 4 in the assembled state. Due to its pretensioning relative to the supporting body 10, different operating pressures (up to 0.5 bar) and thus different flow rates of the fiber suspension in both are possible Use layers.
For this purpose, it is necessary to set the outlet gap heights a and b of the two nozzle chambers 3, 4 differently. For this purpose, the upper lip 18 or lower lip 18 'are pivoted about the joints 14, 14'. This pivoting movement is carried out by an eccentric shaft 16, 16 ', which are supported over the machine width, at regular intervals in bearings 17, 17' on the rigid cover plates 20, 20 'of the device. The eccentricity e of the shafts allows the gap heights a and b to be set between a minimum and a maximum value.
The construction is designed in such a way that even with constant rotation of the eccentric shaft 16, 16 'by a drive 22, the upper lip 18 and the lower lip 18' never come into contact with the lamella tip 12 and therefore no damage can occur.
As a result of this upper and lower lip adjustment via eccentric shafts 16, 16 ', the contour angle α in the two-layer headbox is smaller than in the case of conventional adjustments using geared motors. This enables a considerable shortening of the free jet length f of the material jet from the exit from the headbox to the contact with the screens or felts 24, 24 'running over rollers 25, 25'. This subsequently leads to better stability of the free jet and thus to an improvement in the paper quality.
Due to the rigid lamella tip 12 and the possibility given thereby to provide different flow rates of the suspension in the two chambers (nozzle spaces) 3, 4, there is an increase in the paper quality in the operating mode
Figure 00040001
same types of fabric "in both chambers or a very good separation (covering) of the layers in the operating mode different types of fabric "in both chambers compared to single-layer headboxes or multi-layer headboxes with flexible separating elements at the outlet of the nozzle areas, which allow no difference between the two layers of material.
FIG. 1a shows a detail of the outlet gap in FIG. 1. The different sizes of the outlet gaps a (nozzle space 3) and b (nozzle space 4) can be clearly seen here.
Fig. 2 now shows a three-layer headbox, the suspension simultaneously via three channels 1 transversely to the machine direction in the Vorrich device, then the flow direction of the suspension is deflected by 90 degrees in the machine direction. The suspension then flows through three turbulence generating chambers 2 into the nozzle chambers 3, 4, 5 called outlet chambers, at the end of which they leave the device and hit the dewatering machine. Here it is injected between two screens 24, 24 'which run around two rollers 25, 25'.
Analogously to the embodiment in FIG. 1, the two nozzle spaces 4, 5 are separated by a wall 8, at the end of which there is a one-piece, wedge-shaped lamella tip 12 made of stainless steel. In the assembled state, the partition 8 and the lamella tip 12 form a firm, non-adjustable separating element between the two nozzle spaces 4, 5. Its prestressing relative to the support body 10 enables differences of up to 0.5 bar and thus different flow rates of the fiber suspensions in to achieve two layers.
The two nozzle spaces 3, 4 are separated by a partition 6, which is rotatably mounted about an axis 7. At the outlet-side end of the partition 6 there is also a one-piece lamella tip 12 'made of stainless steel, which is prestressed against the partition 6 by means of tie rods 11. The partition 6 and the lamella tip 12 'thus form a rigid separating element which, however, can be pivoted as a whole about the axis of rotation 7. This pivoting movement is carried out by an eccentric shaft 15, which are supported at regular intervals in bearings 19 on the rigid rear wall 23 of the device over the machine width.
The eccentricity e makes it possible to set the outlet gap height c of the nozzle chamber 4 between a minimum and a maximum value and to fix it. The outlet gap heights a and b of the two nozzle chambers 3 and 5 can also be set and fixed between a minimum and maximum value. For this purpose, the upper lip 18 or lower lip 18 'are pivoted about the joints 14, 14'. This pivoting movement is carried out by an eccentric shaft 1, 16 ', which are supported over the machine width at regular intervals in bearings 17, 17' on the rigid cover plates 20, 20 'of the device. The eccentricity e of the shafts 16, 16 'enables the gap heights a and b to be set between a minimum and a maximum value.
The construction is designed in such a way that even with constant rotation of the eccentric shafts 16, 16 'by a drive 22, the upper lip 18 and the lower lip 18' never come into contact with the lamella tips 12, 12 'and therefore no damage can occur. This also applies to all positions of the movable partition 6 with lamella tip 12 '.
As a result of this upper and lower lip adjustment via eccentric shafts 16, 16 ', the contour angle β in the three-layer headbox is smaller than in the case of conventional adjustments using 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 contact with the screens or felts 24, 24 'running over rollers 25, 25'. This subsequently leads to better stability of the free jet and thus to an improvement in the paper quality.
It is therefore also possible to operate the three-layer headbox with different flow rates in the inner or in the two outer layers.
In addition to the advantages already mentioned in the two-layer headbox, such as paper quality, cover and layer separation, in the three-layer headbox, poorer quality types of material can be used in the middle layer without impairing the paper quality.
FIG. 2a shows a detail of the outlet gap in FIG. 2. The different settings of the outlet gap heights a (nozzle chamber 3), b (nozzle chamber 5) and c (nozzle chamber 4) can be seen.

Fig. 3 zeigt einen Schnitt gemäß Linie III-III in Fig. 1 und analog 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.
Die Erfindung ist nicht auf die dargestellten Beispiele beschränkt. Es können auch andere Arten der Lippenverstellung vorgesehen sein.Fig. 3 shows a section along line III-III in Fig. 1 and analogously in Fig. 2. Here, the eccentric shaft 16 is shown, which is supported several times over the machine width in bearings 17. A geared motor 22 is also shown, with which the gap height of the outlet gap can be adjusted.
The invention is not restricted to the examples shown. Other types of lip adjustment can also be provided.

Claims (10)

Vorrichtung zur Zufuhr einer Faserstoffsuspension auf eine Entwässerungseinrichtung, insbesondere für eine Tissue-Maschine, dadurch gekennzeichnet, daß für einen Zweischicht- oder Mehrschichtstoffauflauf zur Trennung der einzelnen Bereiche eine bzw. mehrere einteilige, keilförmige Lamellenspitze(n) (12, 12') aus Stahl vorgesehen ist bzw. sind.Device for supplying a fiber suspension to a Drainage device, in particular for a tissue machine, characterized in that for a two-layer or Multilayer headbox to separate the individual areas one or several one-piece, wedge-shaped blade tip (s) (12, 12 ') made of steel is or are provided. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Lamellenspitze(n) (12, 12') mittels eines Zugankers (11, 13) gegen die Trennwand (6,8) der Zuführvorrichtung vorgespannt sind.Apparatus according to claim 1, characterized in that the Blade tip (s) (12, 12 ') by means of a tie rod (11, 13) against the Partition (6,8) of the feed device are biased. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Abstand von Unterlippe (18') und/oder Oberlippe (18) zur Lamellenspitse (12, 12') einstellbar ist.Apparatus according to claim 1 or 2, characterized in that the Distance from lower lip (18 ') and / or upper lip (18) to Lamella tip (12, 12 ') is adjustable. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß zur Einstellung der Höhe des Auslaufspaltes zwischen einem Minimal- und Maximalwert eine Exzenterwelle (15, 16, 16') vorgesehen ist.Device according to one of claims 1 to 3, characterized characterized in that to adjust the height of the outlet gap an eccentric shaft (15, 16, 16 ') is provided. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Oberlippe (18) mittels Exzenter (16) verstellbar ist.Apparatus according to claim 1, characterized in that the Upper lip (18) is adjustable by means of an eccentric (16). Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Unterlippe (18') mittels Exzenter (16') verstellbar ist.Device according to claim 1 or 2, characterized in that the Lower lip (18 ') is adjustable by means of an eccentric (16'). Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß eine Trennwand (6) - Lamellenspitzen (12') - Einheit mittels Exzenter (15) verstellbar ist.Device according to one of claims 1 to 6, characterized characterized in that a partition (6) - lamella tips (12 ') - Unit is adjustable by means of an eccentric (15). Vorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Exzenterwelle (15, 16, 16') über die Maschinenbreite mehrfach abgestützt ist. Device according to one of claims 1 to 7, characterized characterized in that the eccentric shaft (15, 16, 16 ') over the Machine width is supported several times. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, daß die Exzenterwelle (15, 16, 16') in gleichmäßigen Abständen abgestützt ist.Apparatus according to claim 8, characterized in that the Eccentric shaft (15, 16, 16 ') is supported at regular intervals. Vorrichtung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß die Exzenterwelle (15, 16, 16') mit einem Getriebemotor (22) verbunden ist.Device according to one of claims 1 to 9, characterized characterized in that the eccentric shaft (15, 16, 16 ') with a Gear motor (22) is connected.
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
AT20698 1998-02-05
AT0020698A AT406171B (en) 1998-02-05 1998-02-05 DEVICE FOR SUPPLYING A FIBER FIBER SUSPENSION TO A DRAINAGE DEVICE

Publications (3)

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

Citations (6)

* 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
GB1585846A (en) * 1976-12-02 1981-03-11 Ahlstroem Dev Gmbh Device for acting on a web of material
DE3010730A1 (en) * 1980-03-20 1981-09-24 J.M. Voith Gmbh, 7920 Heidenheim FABRIC DRAIN FOR A PAPER MACHINE
DE3704462A1 (en) * 1987-02-02 1988-08-11 Escher Wyss Gmbh FABRIC DRIVE FOR A PAPER MACHINE
DE19652982A1 (en) * 1996-12-19 1997-05-22 Voith Sulzer Papiermasch Gmbh Separator blade flush-fit connector in paper pulp multilayer head box
DE19652983A1 (en) * 1996-12-19 1997-05-28 Voith Sulzer Papiermasch Gmbh Separating element for paper machine breast box

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI58364C (en) * 1977-07-13 1981-01-12 Tampella Oy Ab PROCEDURE FOR BANFORMING MACHINES FOR FRAMSTAELLNING AV EN TVAO- ELLER FLERSKIKTIG FIBERBANA
AT387410B (en) * 1983-06-09 1989-01-25 Escher Wyss Gmbh FABRIC DRAIN FOR A PAPER MACHINE
DE3807629A1 (en) * 1988-03-09 1989-09-21 Escher Wyss Gmbh DEVICE FOR HOLDING A SEPARATING SLAT
DE59510338D1 (en) * 1994-04-29 2002-10-02 Voith Paper Patent Gmbh Multi-layer headbox
DE4440079C2 (en) * 1994-11-10 1997-10-02 Voith Sulzer Papiermasch Gmbh Multi-layer headbox

Patent Citations (6)

* 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
GB1585846A (en) * 1976-12-02 1981-03-11 Ahlstroem Dev Gmbh Device for acting on a web of material
DE3010730A1 (en) * 1980-03-20 1981-09-24 J.M. Voith Gmbh, 7920 Heidenheim FABRIC DRAIN FOR A PAPER MACHINE
DE3704462A1 (en) * 1987-02-02 1988-08-11 Escher Wyss Gmbh FABRIC DRIVE FOR A PAPER MACHINE
DE19652982A1 (en) * 1996-12-19 1997-05-22 Voith Sulzer Papiermasch Gmbh Separator blade flush-fit connector in paper pulp multilayer head box
DE19652983A1 (en) * 1996-12-19 1997-05-28 Voith Sulzer Papiermasch Gmbh Separating element for paper machine breast box

Also Published As

Publication number Publication date
US6368464B1 (en) 2002-04-09
EP0936301B1 (en) 2003-11-26
DE59810270D1 (en) 2004-01-08
ATA20698A (en) 1999-07-15
BR9900531A (en) 2000-02-22
AT406171B (en) 2000-03-27
ES2210654T3 (en) 2004-07-01
EP0936301A3 (en) 2000-02-23

Similar Documents

Publication Publication Date Title
DE3514554C2 (en) Headbox device for a paper machine and method for its operation
DE3741603C2 (en)
DE4420801C2 (en) Method for operating a twin wire zone of a paper machine for the production of fibrous webs, and wire zone therefor
EP0711869A2 (en) Multi-layer headbox
DE2857473A1 (en) MICROTURBULENCE GENERATOR FOR THE STOCK CASE OF A PAPER MACHINE
DE3321406C2 (en)
WO2010069652A1 (en) Headbox for a machine for producing a fibrous web
EP0581051A1 (en) Multi-layer headbox for a papermaking machine or the like
EP0681057B1 (en) Multi-layer headbox
EP0639239B1 (en) Jet-speed control in a multi-layer headbox
DE69210417T2 (en) DEVICE WITH CONTROLLED FABRIC INJECTION FOR THE OPERATING BOX OF A PAPER MACHINE
DE2607822A1 (en) FUEL TRAY DEVICE OF A PAPER MACHINE
EP0936302B1 (en) Apparatus for feeding a fibre suspension on a dewatering device
DE3126460A1 (en) MATERIAL DRAIN DEVICE FOR A PAPER MACHINE
DE2800547B2 (en) Headbox for paper machines
DE4328997C2 (en) Wet section of a twin wire GAP former
DE1294803B (en) Headbox for paper machines
DE1294177B (en) Headbox for paper machines
EP1489224A1 (en) Headbox
DE3639823C2 (en)
EP0936301A2 (en) Apparatus for feeding a fibre suspension on a dewatering device
DE69914295T2 (en) DEVICE AND METHOD FOR THE PRODUCTION OF FABRIC TURBULENCE IN THE SHEET PICTURE OF A SLEEPING PAPER MACHINE
DE1461176A1 (en) Headbox with closed headbox, especially for paper machines
DE4029545A1 (en) Stock inlet - has movable upper wall to set suspension delivery point at the fourdrinier without pivoting the jet assembly
EP0831172A2 (en) Wire section and process for dewatering of a fibrous web in a wire section

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): CH DE ES FI FR GB IT LI SE

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

17P Request for examination filed

Effective date: 20000317

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ANDRITZ AG

AKX Designation fees paid

Free format text: CH DE ES FI FR GB IT LI SE

17Q First examination report despatched

Effective date: 20020115

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE ES FI FR GB IT LI SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20031126

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20031231

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20031231

REF Corresponds to:

Ref document number: 59810270

Country of ref document: DE

Date of ref document: 20040108

Kind code of ref document: P

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20040116

Year of fee payment: 6

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 20040223

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2210654

Country of ref document: ES

Kind code of ref document: T3

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20040827

EN Fr: translation not filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20101221

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FI

Payment date: 20111214

Year of fee payment: 14

Ref country code: ES

Payment date: 20111227

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20111222

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20111227

Year of fee payment: 14

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20121229

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20121229

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 59810270

Country of ref document: DE

Effective date: 20130702

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130702

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20121229

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20121229

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20131219

Year of fee payment: 16

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20140307

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20121230

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20141230

REG Reference to a national code

Ref country code: SE

Ref legal event code: EUG