EP0629739B1 - Headbox for a paper machine - Google Patents
Headbox for a paper machine Download PDFInfo
- Publication number
- EP0629739B1 EP0629739B1 EP94108842A EP94108842A EP0629739B1 EP 0629739 B1 EP0629739 B1 EP 0629739B1 EP 94108842 A EP94108842 A EP 94108842A EP 94108842 A EP94108842 A EP 94108842A EP 0629739 B1 EP0629739 B1 EP 0629739B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- headbox
- intermediate chamber
- accordance
- turbulence
- turbulence generator
- 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.)
- Expired - Lifetime
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/02—Head boxes of Fourdrinier machines
- D21F1/022—Means for injecting material into flow within the headbox
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/02—Head boxes of Fourdrinier machines
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/02—Head boxes of Fourdrinier machines
- D21F1/026—Details of the turbulence section
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/06—Regulating pulp flow
Definitions
- the invention relates to a headbox for a paper machine according to The preamble of claim 1 or 2.
- a headbox of the above Type is e.g. in the unpublished German Patent application P 42 13 707 described.
- This particular embodiment of the previously announced object allows, already by adding air or a other medium in particular water or its discharge in the area between two Turbulence producers a targeted influence on the consistency and the Flow condition in the hydraulic headbox.
- One of the goals of this proposed measure is then, in addition to the setting of Basis weight cross-section using geometric gap changes is made to be able to change the flow state.
- a headbox is known from German Offenlegungsschrift DE 37 41 603 A1 with a machine-wide fabric duct, a pipe distribution grid, a compensation duct, a turbulence generator and a nozzle are known, with the material channel a device for dispensing dilution liquid is connected.
- the said Device is attached so that the place of delivery of the dilution liquid immediately in front of the turbulence generator, which is known per se Formed as a turbulence grille insert with an upstream throttle is.
- the German utility model G 91 15 296 U discloses a headbox for one Machine for the production of fibrous webs, in particular paper webs, with a transverse distribution pipe serving to supply material suspension, which via a Pipe distribution grid is connected to a machine-wide compensation channel as well as with an adjoining machine-wide turbulence generator with an in machine-wide nozzle following the flow direction of the stock suspension, wherein in the equalization channel numerous arranged in a row, across the Supply lines for an additional liquid, which extend across the machine, and the mouths of these feed lines both at a fixed distance from nearest inlet of the turbulence generator as well as at a fixed distance are arranged from the outlet of the pipe distribution grid.
- a headbox device shown with a tube bank consisting of a multitude of tubes, the paper stock flowing through the tubes to form a paper web.
- the upstream end of the tube bank is a variety of feed channels connected and each feed channel is in turn connected to a source for dilution of the paper material, which allows the flowing into the tube bank Paperwork is diluted.
- Each feed channel and the associated closure is structured and arranged so that the flow of the dilute of the paper supply water through the closure essentially perpendicular to the flow of the paper product past the end against the neighboring one Tube is out.
- this task is characterized by the characteristics of the Claim 1 or 2 solved.
- the invention makes use of the knowledge that one in front of the intermediate chamber lying intensive turbulence generator with high pressure loss the mixing favored and limited at the same time locally as appropriate.
- a hydraulic turbulence generator with a higher effect comparatively smaller flow cross sections. So he offers the liquid between them leading pipes or channels enough space for the in the characterizing part of claim 1 mentioned additional measures and is also often easier to set up.
- the comparatively small space requirement in the first turbulence generator can be used by the individual channels to make the lines appropriate and appropriate to accommodate space-saving.
- one is considered to be the fluid mentioned in the characterizing part of claims 1 and 2 use a relatively clear dilution water or an aqueous suspension and admit. But it can also partially the fiber suspension flowing in the headbox and derived in doses. Even a limited air supply is possible, as far as it is allows the desired paper quality.
- the solution proposed in claim 2 uses the after the intermediate chamber lying turbulence generator initially available place to accommodate the Lines, the reversal of direction giving an impulse for better mixing can deliver. Even if the pipes are intended to flow in the direction of flow turbulence generator which takes up more space behind the intermediate chamber to accommodate, can be exploited the fact that at the intermediate chamber facing side of the turbulence generator, smaller flow cross sections for the Suspension leading channels are required, which is again a cheap Installation situation for the supply and discharge lines.
- the turbulence generator can too can be used as a rectifier with low pressure loss, so that the Reversal of direction in the feed into the intermediate chamber is a very advantageous Provides support for the relatively weak mixing effect in the rectifier.
- turbulence generators in the form of individual turbulence-increasing pipes and to be provided with the appropriate connections for supply or discharge lines.
- Such Measure could replace the usually quite complex cross-flow distributor make by directly connecting the pipes belonging to the turbulence generator, for example to a hydraulic vibration damping container.
- FIG. 1 shows schematically in side view, partly in section, an embodiment of the Headbox according to the invention.
- An intermediate chamber 4 follows, which is followed by a further turbulence generator 3.
- the one from this second Turbulence generator 3 material suspension emerging in the operation of the headbox is in a nozzle chamber collected and fed to an outlet gap 5, from which they are in shape of a wide gap meets at least one paper machine screen.
- Lines 6 and 6 ' are in the case shown here with those designed as step diffusers Pipelines 7 connected.
- the intermediate chamber 4 can advantageously have a length that is 10 to 20 times as large is like a step change of a turbulence generator designed as a step diffuser to achieve an optimal mixing.
- FIG. 2 shows a device similar to FIG. 1, with line 6 in each case is the same for all superimposed pipelines 7.
- the headbox shown in FIG. 3 contains only the first turbulence generator 2 a pipe 7, viewed in the vertical, which is also a step diffuser. It are indicated several places where a line 6 may be present. In the In most cases, the line not shown in dashed lines, which is in the first part of the turbulence generator, the most advantageous option. Both in this Line 6 and in the feed line to the turbulence generator 2 are control valves provided that can be controlled together via a control loop. As Another possibility to the flow in the turbulence generator 2 as desired influence, the change in the angle at which the line is indicated in Fig. 3 6 opens into the turbulence generator 2. This allows very targeted impulses to better mixing can be generated.
- the intermediate chamber 4 is intrinsically in number Flow direction and walls 11 in extending perpendicular to the sieve plane Sub-chambers divided. In special cases this can cause an undesirable Cross-mixing in the intermediate chamber 4 can be prevented.
- the lines 6 in the first part of the gradual widening flow channels 8 open.
- FIG. 8 the technical structure of a with stage diffuser-like flow channels 8 provided turbulence generator 2 shown.
- One way of making the lines 6 particularly simple, that is to say with little construction effort to produce, is shown there:
- Within the turbulence generator block Bores with such a diameter transverse to the flow channels 8 introduced that they cut the flow channels, creating a connection is established between flow channels and lines. Expediently two adjacent rows of superimposed flow channels so with the same Supply line connected.
- This embodiment is shown in somewhat more detail in FIG. 13.
- the lines 6 can also within the second Turbulence generator 3 and be connected to the intermediate chamber 4. To this In this way an impulse is generated against the actual flow direction, which too a mixing of the supplied water with the suspension leads (Fig. 9 and 10).
- FIG. 11 shows a somewhat simpler embodiment, in which the turbulence generator 2 two channels lie one above the other and the line 6 only in one of them superimposed channels, in this case in the upper one.
- Figure 12 shows the combination of supply of dilution water (arrow 12) in the Turbulence generator 2 and withdrawal of suspension (arrow 13) in the turbulence generator 3.
- arrow 12 dilution water
- Figure 13 withdrawal of suspension
- Figure 12 shows the combination of supply of dilution water (arrow 12) in the Turbulence generator 2 and withdrawal of suspension (arrow 13) in the turbulence generator 3.
- liquid is supplied and removed in a streamline the total amount of liquid in an imaginary direction of flow contiguous area set as desired, e.g. kept the same be, with an additional option being created to the fiber amount the headbox width by changing the existing in this streamline Adjust fiber density.
- the invention can also be easily implemented in multilayer headboxes, 14 as an example.
- the one shown schematically there Two-layer headbox has two independently loadable Liquid supply devices 1, which are two downstream Connect turbulence generators 2 and 3, with an intermediate chamber 4 in between lies and the last turbulence generator 3 in the direction of a nozzle with a Partition 14 follows, at the end of which the exit gap 5 is located.
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Abstract
Description
Die Erfindung bezieht sich auf einen Stoffauflauf für eine Papiermaschine gemäß
Oberbegriff des Anspruchs 1 oder 2.The invention relates to a headbox for a paper machine according to
The preamble of
Ein Stoffauflauf der o.g. Art ist z.B. in der noch nicht veröffentlichten deutschen Patentanmeldung P 42 13 707 beschrieben. Diese besondere Ausgestaltung des vorangemeldeten Gegenstandes gestattet es, bereits durch Zugabe von Luft oder einem anderen Medium insbesondere Wasser bzw. deren Ableitung im Bereich zwischen zwei Turbulenzerzeugern eine gezielte Beeinflussung der Stoffdichte und des Strömungszustandes im hydraulischen Stoffauflauf vorzunehmen. Eines der Ziele dieser vorgeschlagenen Maßnahme liegt dann, zusätzlich zur Einstellung des Flächengewichtsquerprofils, die mit Hilfe geometrischer Spaltveränderungen vorgenommen wird, den Strömungszustand verändern zu können. A headbox of the above Type is e.g. in the unpublished German Patent application P 42 13 707 described. This particular embodiment of the previously announced object allows, already by adding air or a other medium in particular water or its discharge in the area between two Turbulence producers a targeted influence on the consistency and the Flow condition in the hydraulic headbox. One of the goals of this proposed measure is then, in addition to the setting of Basis weight cross-section using geometric gap changes is made to be able to change the flow state.
Weiterhin ist aus der deutschen Offenlegungsschrift DE 37 41 603 A1 ein Stoffauflauf mit einem maschinenbreiten Stoffkanal, einem Rohrverteilgitter, einem Ausgleichskanal, einem Turbulenzerzeuger sowie einer Düse bekannt, wobei an den Stoffkanal eine Einrichtung zur Abgabe von Verdünnungsflüssigkeit angeschlossen ist. Die genannte Einrichtung ist derart angebracht, daß der Ort der Abgabe der Verdünnungsflüssigkeit unmittelbar vor dem Turbulenzerzeuger liegt, der in an sich bekannter Weise als Turbulenzgittereinsatz mit einer zuströmseitigen Drosselstelle ausgebildet ist.Furthermore, a headbox is known from German Offenlegungsschrift DE 37 41 603 A1 with a machine-wide fabric duct, a pipe distribution grid, a compensation duct, a turbulence generator and a nozzle are known, with the material channel a device for dispensing dilution liquid is connected. The said Device is attached so that the place of delivery of the dilution liquid immediately in front of the turbulence generator, which is known per se Formed as a turbulence grille insert with an upstream throttle is.
Das deutsche Gebrauchsmuster G 91 15 296 U offenbart einen Stoffauflauf für eine Maschine zur Herstellung von Faserstoffbahnen, insbesondere Papierbahnen, mit einem zum Zuführen von Stoffsuspension dienenden Querverteilrohr, das über ein Rohrverteilgitter mit einem maschinenbreiten Ausgleichskanal verbunden ist sowie mit einem sich daran anschließenden maschinenbreiten Turbulenzerzeuger mit einer in der Fließrichtung der Stoffsuspension nachfolgenden maschinenbreiten Düse, wobei in den Ausgleichskanal zahlreiche in einer Reihe angeordnete, sich quer über die Maschinenbreite erstreckende Zuführleitungen für eine Zusatzflüssigkeit münden und die Mündungsstellen dieser Zuführleitungen sowohl in einem festen Abstand vom nächstgelegenen Einlaß des Turbulenzerzeugers als auch in einem festen Abstand vom Auslaß des Rohrverteilgitters angeordnet sind.The German utility model G 91 15 296 U discloses a headbox for one Machine for the production of fibrous webs, in particular paper webs, with a transverse distribution pipe serving to supply material suspension, which via a Pipe distribution grid is connected to a machine-wide compensation channel as well as with an adjoining machine-wide turbulence generator with an in machine-wide nozzle following the flow direction of the stock suspension, wherein in the equalization channel numerous arranged in a row, across the Supply lines for an additional liquid, which extend across the machine, and the mouths of these feed lines both at a fixed distance from nearest inlet of the turbulence generator as well as at a fixed distance are arranged from the outlet of the pipe distribution grid.
Ferner wird in der PCT-Offenlegungsschrift WO 93/09286 A eine Stoffauflaufkastenvorrichtung mit einer aus einer Vielzahl von Röhren bestehenden Röhrenbank gezeigt, wobei durch die Röhren das Papierzeug zur Bildung einer Papierbahn hindurchströmt. Mit dem stromaufwärts gelegenen Ende der Röhrenbank ist eine Vielzahl von Zuführkanälen verbunden und jeder Zuführkanal ist wiederum mit einer Quelle zum Verdünnen des Papierzeuges verbunden, die es erlaubt, daß das in die Röhrenbank hineinströmende Papierzeug verdünnt wird. Jeder Zuführkanal und der dazugehörige Abschluß ist derart strukturiert und angeordnet, daß die Strömung des zum Verdünnen des Papierzeuges zugeführten Wassers durch den Abschluß hindurch im wesentlichen senkrecht zur Strömung des Papierzeuges am Abschluß vorbei gegen die benachbarte Röhre hin ist. Furthermore, in the PCT publication WO 93/09286 A a headbox device shown with a tube bank consisting of a multitude of tubes, the paper stock flowing through the tubes to form a paper web. With the upstream end of the tube bank is a variety of feed channels connected and each feed channel is in turn connected to a source for dilution of the paper material, which allows the flowing into the tube bank Paperwork is diluted. Each feed channel and the associated closure is structured and arranged so that the flow of the dilute of the paper supply water through the closure essentially perpendicular to the flow of the paper product past the end against the neighboring one Tube is out.
Die in den vorgenannten Schriften genannten Lösungen sind insofern nachteilig, als daß sie Querströmungen, wie sie insbesondere bei der Einstellung des Flächengewichtsquerprofils entstehen können, einen unbefriedigenden Zustand der Faserorientierung auf der gebildeten Bahn bewirken können, nicht vollständig verhindern können und weiterhin die AbstimmungThe solutions mentioned in the aforementioned documents are disadvantageous in that that they have cross flows, such as in particular when setting the basis weight cross profile can result in an unsatisfactory state of fiber orientation can cause on the formed path, can not completely prevent and continue voting
Es ist nun Aufgabe der vorgelegten Erfindung, die Möglichkeiten zur Beeinflussung des Strömungszustandes weiter zu verbessern und/oder auch partiell Einfluß auf die Stoffdichte im Stoffauflauf nehmen zu können, möglichst bei gleichzeitiger Beschränkung des dazu erforderlichen apparativen Aufwandes.It is now the task of the presented invention, the possibilities for influencing to further improve the flow state and / or also partially influence the To be able to take consistency in the headbox, if possible with simultaneous restriction the equipment required for this.
Diese Aufgabe wird je nach vorliegenden Bedingungen durch die Kennzeichen des
Anspruches 1 oder 2 gelöst.Depending on the existing conditions, this task is characterized by the characteristics of the
Die Unteransprüche geben eine Anzahl von besonders günstigen Ausführungsformen an. The subclaims indicate a number of particularly favorable embodiments.
Durch die Erfindung wird die Erkenntnis genutzt, daß ein vor der Zwischenkammer
liegender intensiver Turbulenzerzeuger mit hohem Druckverlust die Vermischung
begünstigt und diese gleichzeitig lokal so weit begrenzt wie zweckmäßig. Bekanntlich
weist ein hydraulischer Turbulenzerzeuger mit höherer Wirkung vergleichsweise
kleinere Strömungsquerschnitte auf. Er bietet also zwischen den die Flüssigkeit
führenden Rohren oder Kanälen genügend Platz für die im Kennzeichen des Anspruchs 1
genannten zusätzlichen Maßnahmen und ist zudem oft einfacher im Aufbau. In vielen
Fällen kann der im ersten Turbulenzerzeuger vergleichsweise geringe Platzbedarf
durch die einzelnen Kanäle dazu genutzt werden, die Leitungen entsprechend sinnvoll und
platzsparend unterzubringen.The invention makes use of the knowledge that one in front of the intermediate chamber
lying intensive turbulence generator with high pressure loss the mixing
favored and limited at the same time locally as appropriate. As is well known
shows a hydraulic turbulence generator with a higher effect comparatively
smaller flow cross sections. So he offers the liquid between them
leading pipes or channels enough space for the in the characterizing part of
Im allgemeinen wird man als das im Kennzeichen der Ansprüche 1 und 2 genannte Fluid
ein relativ klares Verdünnungswasser oder eine wässrige Suspension verwenden und
zugeben. Es kann aber auch die im Stoffauflauf fließende Faserstoffsuspension partiell
und dosiert abgeleitet werden. Möglich ist sogar eine begrenzte Luftzufuhr, soweit es die
gewünschte Papierqualität zuläßt.In general, one is considered to be the fluid mentioned in the characterizing part of
Es ist auch denkbar, die Stoffstromführung im Stoffauflauf so zu gestalten, daß über den Flüssigkeitszuführungsvorrichtung 1 eine dünnere Suspension und über die Zuleitungen 6 eine dickere Suspension zugeführt wird. Dadurch ließen sich die bekanntlich an der konventionellen Mischpumpe bestehenden Probleme einer unzureichenden Vermischung lösen: Da im Stoffauflauf ohnehin eine Verteilung des Gesamtstromes in viele Teilströme erfolgt, kann dort auch die Vermischung zwischen Dickstoff und Verdünnungswasser besonders gut durchgeführt werden.It is also conceivable to design the material flow in the headbox so that the Liquid supply device 1 a thinner suspension and via the feed lines 6 a thicker suspension is fed. As a result, the conventional mixing pump existing problems of insufficient mixing solve: Since in the headbox anyway a distribution of the total flow into many partial flows takes place there can also be the mixing between thick matter and dilution water be performed particularly well.
Die im Anspruch 2 vorgeschlagene Lösung nutzt den im nach der Zwischenkammer
liegenden Turbulenzerzeuger eingangs vorhandenen Patz zur Unterbringung der
Leitungen, wobei die Richtungsumkehr einen Impuls zur bessereren Vermischung
liefern kann. Auch wenn beabsichtigt wird, die Leitungen im in Strömungsrichtung
hinter der Zwischenkammer gelegenen mehr Platz brauchenden Turbulenzerzeuger
unterzubringen, kann die Tatsache ausgenutzt werden, daß an der der Zwischenkammer
zugewandten Seite des Turbulenzerzeugers geringere Strömungsquerschnitte für die
Suspension führenden Kanäle erforderlich sind, wodurch sich wieder eine günstige
Einbausituation für die Zu- bzw. Ableitungen ergibt. Der Turbulenzerzeuger kann auch
als Gleichrichter mit geringem Druckverlust genutzt werden, so daß dann die
Richtungsumkehr bei der Zuleitung in die Zwischenkammer eine sehr vorteilhafte
Unterstützung der im Gleichrichter relativ schwachen Mischwirkung bietet.The solution proposed in
Es wird fernerhin vorgeschlagen, den vor der Zwischenkammer liegenden Turbulenzerzeuger in Form von einzelnen turbulenzerhöhenden Rohren auszubilden und mit den entsprechenden Anschlüssen für Zu- oder Ableitungen zu versehen. Eine solche Maßnahme könnte den üblicherweise recht aufwendigen Querstromverteiler ersetzbar machen durch direkten Anschluß der zum Turbulenzerzeuger gehörenden Rohre, beispielsweise an einen hydraulischen Schwingungsdämpfungsbehälter.It is also proposed that the one located in front of the intermediate chamber Train turbulence generators in the form of individual turbulence-increasing pipes and to be provided with the appropriate connections for supply or discharge lines. Such Measure could replace the usually quite complex cross-flow distributor make by directly connecting the pipes belonging to the turbulence generator, for example to a hydraulic vibration damping container.
Die Erfindung wird beschrieben und erläutert anhand von Zeichnungen. Dabei zeigen:
Figur 1- schematisch den Erfindungsgegenstand nach
Anspruch 1 in Seitenansicht; Figur 2- den Erfindungsgegenstand von
Figur 1 in Ansicht von oben; Figur 3+4- jeweils Varianten des Stoffauflaufs gemäß
Anspruch 1 in Seitenansicht; Figur 5- eine schematische Teilansicht des Stoffauflaufs von
Figur 4; - Figur 6-8
- weitere Varianten;
Figur 9- einen Stoffauflauf gemäß
Anspruch 2 in Seitenansicht; Figur 10- Variante des in
Figur 9 gezeigten Stoffauflaufes in Ansicht von oben; - Fig 11+12
- weitere Varianten;
- Fig. 13
- Detail des Anschlusses von Leitungen an den Turbulenzerzeuger;
Figur 14- schematisch den Erfindungsgegenstand als Zweischichtstoffauflauf.
- Figure 1
- schematically the subject of the invention according to
claim 1 in side view; - Figure 2
- the subject of the invention of Figure 1 in top view;
- Figure 3 + 4
- variants of the headbox according to
claim 1 in side view; - Figure 5
- a schematic partial view of the headbox of Figure 4;
- Figure 6-8
- further variants;
- Figure 9
- a headbox according to
claim 2 in side view; - Figure 10
- Variant of the headbox shown in Figure 9 in top view;
- Fig 11 + 12
- further variants;
- Fig. 13
- Detail of the connection of lines to the turbulence generator;
- Figure 14
- schematically the subject of the invention as a two-layer headbox.
Figur 1 stellt schematisch in Seitenansicht, teils geschnitten, eine Ausführungsform des
erfindungsgemäßen Stoffauflaufes dar. Man erkennt eine
Flüssigkeitszuführungsvorrichtung 1, der in einen aus mehreren Rohrleitungen 7
bestehenden Turbulenzerzeuger 2 mündet. Es schließt sich eine Zwischenkammer 4 an,
welcher stromab ein weiterer Turbulenzerzeuger 3 folgt. Die aus diesem zweiten
Turbulenzerzeuger 3 im Betrieb des Stoffauflaufs austretende Stoffsuspension wird in
einem Düsenraum gesammelt und einem Austrittsspalt 5 zugeführt, aus der sie in Form
eines Breitspaltes auf mindestens ein Papiermaschinensieb trifft. Die Leitungen 6 und
6' sind in dem hier dargestellten Fall mit den als Stufendiffusoren ausgebildeten
Rohrleitungen 7 verbunden. Es ist nun eine Frage des Aufwandes, wieviele der
Rohrleitungen 7 Anschlüsse an die Leitungen 6 bzw. 6' haben, wieviel davon über eine
gemeinsame Zuleitung verbunden sind oder ob ein Teil der Rohrleitungen 7 ohne
derartige Anschlüsse bleibt. Je feiner die Unterteilung von Leitungen und individuellen
Regelkreisen ist, umso feiner kann die Beeinflussung des Querprofils erfolgen. Hier
muß der zweifellos große Aufwand einer feinstrukturierten Verstellbarkeit gegen die
Forderung nach wirtschaftlicher Papiererzeugung abgewogen werden.Figure 1 shows schematically in side view, partly in section, an embodiment of the
Headbox according to the invention. One recognizes one
Mit Vorteil kann die Zwischenkammer 4 eine Länge haben, die 10 bis 20 mal so groß
ist wie ein Stufensprung eines als Stufendiffusor ausgebildeten Turbulenzerzeugers, um
eine optimale Vermischung zu erzielen.The
Die Figur 2 zeigt eine ähnliche Vorrichtung wie die Figur 1, wobei die Leitung 6 jeweils
für alle übereinanderliegenden Rohrleitungen 7 die gleiche ist.FIG. 2 shows a device similar to FIG. 1, with
Der in Figur 3 gezeigte Stoffauflauf enthält als ersten Turbulenzerzeuger 2 lediglich
eine Rohrleitung 7, in der Vertikalen betrachtet, die ebenfalls ein Stufendiffusor ist. Es
sind mehrere Stellen angedeutet, an denen eine Leitung 6 vorhanden sein kann. In den
meisten Fällen wird die nicht gestrichelt gezeichnete Leitung, welche in den ersten Teil
des Turbulenzerzeugers mündet, die vorteilhafteste Möglichkeit sein. Sowohl in dieser
Leitung 6 als auch in der Zuleitung zum Turbulenzerzeuger 2 sind jeweils Regelventile
vorgesehen, die über einen Regelkreis gemeinsam angesteuert werden können. Als
weitere Möglichkeit, die Strömung im Turbulenzerzeuger 2 wunschgemäß zu
beeinflussen, ist in Fig. 3 die Veränderung des Winkels angedeutet, mit dem die Leitung
6 in den Turbulenzerzeuger 2 einmündet. Hierdurch können ganz gezielte Impulse zur
besseren Vermischung erzeugt werden. In den Figuren 4 und 5 wird eine
Ausführungsform gezeigt, bei der sich die Leitungen 6 zwar räumlich im Bereich des
ersten Turbulenzerzeugers 2 befinden, aber in die Zwischenkammer 4 einmünden. Eine
solche Ausführung ist im Bauaufwand einfacher und kompakter, nutzt aber dennoch die
Turbulenzen aus, mit denen die Suspension aus den Strömungskanälen 8 aus- und in die
Zwischenkammer 4 eintritt. Wie hier gezeigt, kann der Turbulenzerzeuger 2 statt
durch freistehende Rohrleitungen auch durch einen mit Strömungskanälen 8 versehenen
Block gebildet sein. Die Strömungskanäle 8 erweitern sich stufenweise in
Strömungsrichtung betrachtet, sind also als Stufendiffusoren ausgebildet. Wie Fig.6
zeigt, können die Leitungen 6 auch von der Seite her in den Stoffauflauf eingesetzt sein.The headbox shown in FIG. 3 contains only the first turbulence generator 2
a
Nach Figur7 ist die Zwischenkammer 4 durch eine Anzahl von sich in
Strömungsrichtung und senkrecht zur Siebebene erstreckende Wände 11 in
Teilkammern unterteilt. In speziellen Fällen kann dadurch eine unerwünschte
Quervermischung in der Zwischenkammer 4 verhindert werden. Als weitere Variante
ist in dieser Figur zu sehen, daß die Leitungen 6 in den ersten Teil der sich stufenweise
erweiternden Strömungskanäle 8 münden.According to FIG. 7, the
In Figur 8 wird, wenn auch schematisch, der technische Aufbau eines mit
stufendiffusorartigen Strömungskanälen 8 versehenen Turbulenzerzeugers 2 gezeigt.
Eine Möglichkeit, die Leitungen 6 besonders einfach, also mit geringem Bauaufwand
herzustellen, ist dort dargestellt: Innerhalb des Turbulenzerzeugerblockes werden
Bohrungen mit einem solchen Durchmesser quer zu den Strömungskanälen 8
eingebracht, daß sie die Strömungskanäle anschneiden, wodurch eine Verbindung
zwischen Strömungskanälen und Leitungen hergestellt wird. Zweckmäßigerweise werden
zwei benachbarte Reihen von übereinanderliegenden Strömungskanälen so mit derselben
Zuleitung verbunden. Diese Ausführung ist in Fig. 13 noch etwas detaillierter gezeigt.In Figure 8, the technical structure of a with
stage diffuser-
Wie im Anspruch 2 beschrieben, können die Leitungen 6 auch innerhalb des zweiten
Turbulenzerzeugers 3 liegen und mit der Zwischenkammer 4 verbunden sein. Auf diese
Weise wird ein Impuls gegen die eigentliche Strömungsrichtung erzeugt, welche zu
einer Vermischung des zugeführten Wassers mit der Suspension führt (Fig. 9 und 10). As described in
Figur 11 zeigt eine etwas einfachere Ausführungsform, bei der im Turbulenzerzeuger 2
jeweils zwei Kanäle übereinanderliegen und die Leitung 6 nur in den einen von den
übereinanderliegenden Kanälen, in diesem Falle in den oberen, erfolgt.FIG. 11 shows a somewhat simpler embodiment, in which the
Figur 12 zeigt die Kombination aus Zufuhr von Verdünnungswasser (Pfeil 12) im
Turbulenzerzeuger 2 und Abzug von Suspension (Pfeil 13) im Turbulenzerzeuger 3.
Auf diese Weise ist es mit Vorteil möglich, einen Einfluß auf das
Flächengewichtsquerprofil vorzunehmen und gleichzeitig die Strömung in gewünschter
Form zu erhalten. Dadurch daß in einer Stromlinie Flüssigkeit zugeführt und abgeführt
wird, kann die Gesamtmenge der Flüssigkeit in einem in Strömungsrichtung gedachten
zusammenhängenden Bereich in gewünschter Weise eingestellt, z.B. gleichgehalten
werden, wobei zusätzlich eine Möglichkeit geschaffen wurde, die Faserstoffmenge über
die Stoffauflaufbreite durch Veränderung der in dieser Stromlinie vorhandenen
Faserstoffdichte einzustellen.Figure 12 shows the combination of supply of dilution water (arrow 12) in the
Die Erfindung kann ohne weiteres auch bei Mehrschichtstoffaufläufen realisiert werden,
wie Fig. 14 exemplarisch zeigt. Der dort schematisch dargestellte
Zweischicht-Stoffauflauf weist zwei unabhängig beschickbare
Flüssigkeitszuführungsvorrichtungen 1 auf, denen sich stromabwärts je zwei
Turbulenzerzeuger 2 und 3 anschließen, wobei dazwischen je eine Zwischenkammer 4
liegt und dem in Stromrichtung letzten Turbulenzerzeuger 3 ein Düsenraum mit einer
Trennwand 14 folgt, an dessen Ende sich der Austrittsspalt 5 befindet.The invention can also be easily implemented in multilayer headboxes,
14 as an example. The one shown schematically there
Two-layer headbox has two independently loadable
Claims (19)
- Headbox for a paper making machine comprising at least one liquid supply apparatus (1) which is in each case followed downstream by at least two turbulence generators each formed by a plurality of turbulence producing elements, wherein an intermediate chamber (4) is present between two sequential turbulence generators (2 and 3), and wherein a nozzle space follows the last turbulence generator in the flow direction, with an outlet gap (5) extending substantially over the entire width of the paper making machine being located at the end of the nozzle space, from which a stream of suspension can emerge in the operation of the headbox, characterised in that lines (6) are located in the region of the turbulence generator (2) lying in the flow direction upstream of the intermediate chamber (4) which are so designed and connected that fluid can either be supplied or removed through them.
- Headbox for a paper making machine comprising at least one liquid supply apparatus (1) which is in each case followed downstream by at least two turbulence generators each formed by a plurality of turbulence producing elements, wherein an intermediate chamber (4) is present between two sequential turbulence generators (2 and 3), and wherein a nozzle space follows the last turbulence generator in the flow direction, with an outlet gap (5) extending substantially over the entire width of the paper making machine being located at the end of the nozzle space, from which a stream of suspension can emerge in the operation of the headbox, characterised in that lines (6') are located in the region of the turbulence generator (3) lying in the flow direction downstream of the intermediate chamber (4) and are so designed and connected that fluid can be supplied through them into the intermediate chamber or removed from it, wherein the supply direction of the fluid is directed against the flow direction of the stream of suspension.
- Headbox in accordance with claim 1 or claim 2,
characterised in that
the turbulence generator (2) lying upstream of the intermediate chamber (4) comprises a plurality of tube ducts (7), the flow cross-section of which is designed to produce turbulence. - headbox in accordance with claim 3,
characterised in that
the angle between the line (6) and the tube duct (7) can be adjusted during operation. - Headbox in accordance with claim 1 or claim 2,
characterised in that
the turbulence generator (2) lying upstream of the intermediate chamber (4) is formed as a constructional unit with a plurality of flow channels (8) which enlarge step-wise, so-called step diffusers. - Headbox in accordance with claim 3, 4, or 5,
characterised in that
the lines (6, 6') open into the flow channels or tube ducts. - Headbox in accordance with claim 1, 3 or 5,
characterised in that
the lines (6, 6') open into the intermediate chamber (4) from the side adjacent the turbulence generator (2) lying upstream of it. - Headbox in accordance with claim 5,
characterised in that
further channels for the liquid supplied or removed through the lines (6, 6') are present in the constructional unit in addition to the step diffusers and open into the intermediate chamber (4) from the side adjacent the turbulence generator (2) lying upstream of it. - Headbox in accordance with claim 1 or claim 2,
characterised in that
the flow cross-sections are so selected at the entry to the turbulence generator (2) lying upstream of the intermediate chamber (4) that at this point an acceleration to at least three times the previous flow speed takes place during operation of the headbox. - Headbox in accordance with claim 1, 2 or 9,
characterised in that
the pressure loss at the turbulence generator (2) lying upstream of the intermediate chamber (4) is at least 1.5 times as high as the pressure loss at the turbulence generator (3) lying downstream of the intermediate chamber (4). - Headbox in accordance with claim 1 and claim 2,
characterised in that
the lines (6) are connected to a liquid supply means and the lines (6') are connected to a liquid extraction means. - Headbox in accordance with claim 1,
characterised in that
the flow cross-section at the entry to the turbulence generator (2) lying upstream of the intermediate chamber (4) is adjustable. - Headbox in accordance with claim 1,
characterised in that
the quantity through the lines (6) is adjustable by a positioning valve (9) or the like. - Headbox in accordance with claim 12 and 13,
characterised in that
the adjustment of the valve (9) at the line is matched to the adjustment of the valve (10) at the inlet into the turbulence generator lying upstream of the intermediate chamber (4). - Headbox in accordance with claim 1,
characterised in that
the lines (6) open in the first section of the turbulence generator (2) lying upstream of the intermediate chamber (4). - Headbox in accordance with claim 1,
characterised in that
the length of the intermediate chamber (4) in the flow direction is 10 to 20 times as large as the dimension of the step change between the penultimate element of the turbulence generator (2) lying upstream of the intermediate chamber (4) and the last element. - Headbox in accordance with claim 1,
characterised in that
the intermediate chamber (4) is subdivided into part chamber by walls (11) which extend substantially perpendicular to the screen plane and in the flow direction. - Headbox in accordance with claim 17,
characterised in that
the walls have open surface components, so that they permit a restricted transverse flow in the intermediate chamber (4). - Headbox in accordance with one of the preceding claims,
characterised in that
it is a multi-layer headbox with two or more liquid supply apparatuses (1) which are each followed downstream by two turbulence generators per liquid supply apparatus, wherein a respective intermediate chamber (4) is present between each two sequential turbulence generators (2 and 3) and wherein a nozzle space with at least one partition wall (14) follows the last turbulence generator in the flow direction, with the outlet gap (5) being located at the end of the nozzle space.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4320243 | 1993-06-18 | ||
| DE4320243A DE4320243C2 (en) | 1993-06-18 | 1993-06-18 | Headbox for a paper machine |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0629739A1 EP0629739A1 (en) | 1994-12-21 |
| EP0629739B1 true EP0629739B1 (en) | 1999-09-08 |
| EP0629739B2 EP0629739B2 (en) | 2006-04-19 |
Family
ID=6490642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94108842A Expired - Lifetime EP0629739B2 (en) | 1993-06-18 | 1994-06-09 | Headbox for a paper machine |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0629739B2 (en) |
| AT (1) | ATE184336T1 (en) |
| DE (2) | DE4320243C2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8221590B2 (en) | 2008-12-18 | 2012-07-17 | Voith Patent Gmbh | Headbox for a machine for producing a fibrous web |
| US8236137B2 (en) | 2008-12-18 | 2012-08-07 | Voith Patent Gmbh | Headbox for a machine for producing a fibrous web |
| US8236138B2 (en) | 2008-12-18 | 2012-08-07 | Voith Patent Gmbh | Headbox for a machine for producing a fibrous web |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5560807A (en) * | 1995-03-29 | 1996-10-01 | Beloit Technologies, Inc. | Headbox additive injection system |
| US5626722A (en) * | 1995-06-01 | 1997-05-06 | Valmet Corporation | Headbox of a paper/board machine |
| US6210535B1 (en) | 1995-06-01 | 2001-04-03 | Valmet Corporation | Stock feed system for a multi-layer headbox and method in the operation of a multi-layer headbox |
| FI115646B (en) * | 1996-11-26 | 2005-06-15 | Metso Paper Inc | Multi-layer inlet box for paper machine / cardboard machine |
| DE19652442A1 (en) * | 1996-12-17 | 1998-06-18 | Voith Sulzer Papiermasch Gmbh | Stock inlet |
| DE19705590A1 (en) * | 1997-02-14 | 1998-08-20 | Voith Sulzer Papiermasch Gmbh | Paper making machine stock inlet |
| DE19705591A1 (en) * | 1997-02-14 | 1998-08-20 | Voith Sulzer Papiermasch Gmbh | Apparatus is for breast box of paper machine |
| DE19718034A1 (en) * | 1997-04-29 | 1998-11-05 | Voith Sulzer Papiermasch Gmbh | Stock inlet |
| AU6695798A (en) * | 1997-04-29 | 1998-11-24 | Beloit Technologies, Inc. | High consistency stock profiling |
| US6117272A (en) * | 1998-09-03 | 2000-09-12 | Voith Sulzer Papiermaschinen | Device and process for metering auxiliary materials into the flow box of a paper machine |
| DE19926805A1 (en) * | 1999-06-12 | 2000-12-14 | Voith Sulzer Papiertech Patent | Stock inlet for a papermaking machine etc has one or more fluid injectors at the turbulence tubes to inject controlled fluid doses with min effect on the total suspension vol flow |
| DE10208610B4 (en) * | 2002-02-27 | 2014-03-06 | Voith Patent Gmbh | Method for distributing a pulp suspension in the headbox of a paper or board machine and headbox |
| DE10233007B3 (en) * | 2002-07-20 | 2004-04-01 | Sächsisches Textilforschungsinstitut e.V. | Vehicle seat used especially as a child car seat has an exchangeable support which is fixed to the car seat using a flexible connecting element having a flat textile structure with adhering surfaces on both sides |
| EP1496150A1 (en) * | 2003-07-09 | 2005-01-12 | Voith Paper Patent GmbH | Headbox |
| DE10331039A1 (en) * | 2003-07-09 | 2005-01-27 | Voith Paper Patent Gmbh | headbox |
| DE102004055919A1 (en) * | 2004-11-19 | 2006-05-24 | Voith Paper Patent Gmbh | headbox |
| DE102009014268B3 (en) * | 2009-03-20 | 2010-04-08 | Andritz Küsters Gmbh | Paper machine arrangement for manufacturing e.g. paper such as filter paper, has transverse flow distributers for respective material stream and dilution water, and valve provided at borehole for passage of flow amount to dilution water |
| CN103821023A (en) * | 2014-03-03 | 2014-05-28 | 广东石油化工学院 | Complementary headbox |
| CN108166302A (en) * | 2018-01-10 | 2018-06-15 | 浙江山鹰纸业有限公司 | A kind of head box for double net paper machines |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3573160A (en) * | 1969-01-29 | 1971-03-30 | Kasimir Lopas | Tapered manifold stock distribution system for a papermaking machine with movable wall therein |
| CH598407A5 (en) * | 1975-09-30 | 1978-04-28 | Escher Wyss Gmbh | |
| FI66931C (en) * | 1983-01-04 | 1984-12-10 | Tampella Oy Ab | HAOLSKIVA FOER EN INLOPPSLAODA FOER EN PAPPERSMASKIN |
| DE3514554C3 (en) * | 1984-09-19 | 1998-01-08 | Escher Wyss Gmbh | Headbox device for a paper machine and method for its operation |
| DE3741603A1 (en) * | 1987-12-09 | 1989-06-22 | Voith Gmbh J M | FABRIC DRAIN FOR A PAPER MACHINE OR THE LIKE. |
| FR2631353A1 (en) † | 1988-05-13 | 1989-11-17 | Semti | PASTA MIXED FEEDING DEVICE |
| FI84920C (en) * | 1988-05-27 | 1992-02-10 | Valmet Ahlstroem Inc | Hydraulic inlet box in paper or cardboard machine |
| DE4005281C2 (en) * | 1990-02-20 | 1995-04-06 | Schultz Hans Joachim Dr Ing | Headbox with regulation of the basis weight cross-section via the dilution of the fiber suspension |
| FI901593A (en) † | 1990-03-30 | 1991-10-01 | Tampella Oy Ab | FOERFARANDE VID EN PAPPERS- ELLER KARTONGMASKIN FOER REGLERING AV UR INLOPPSLAODAN LOEPANDE MASSA SAMT INLOPPSLAODA FOER EN PAPPERSELLER KARTONGMASKIN. |
| DE4019593C2 (en) † | 1990-06-20 | 1994-01-20 | Voith Gmbh J M | Headbox for paper machines |
| US5196091A (en) * | 1991-10-29 | 1993-03-23 | Beloit Technologies, Inc. | Headbox apparatus with stock dilution conduits for basis weight control |
| DE9115296U1 (en) * | 1991-12-10 | 1992-03-19 | J.M. Voith Gmbh, 7920 Heidenheim | Headbox |
| DE4234940C2 (en) * | 1992-10-16 | 1994-04-07 | Voith Gmbh J M | Headbox with basis weight cross profile control by local concentration change |
| DE4239845C2 (en) * | 1992-11-05 | 1998-12-03 | Voith Gmbh J M | Procedure for measuring the effect of adjustments on the headbox and for correcting the basis weight and fiber orientation cross profile |
-
1993
- 1993-06-18 DE DE4320243A patent/DE4320243C2/en not_active Revoked
-
1994
- 1994-06-09 EP EP94108842A patent/EP0629739B2/en not_active Expired - Lifetime
- 1994-06-09 AT AT94108842T patent/ATE184336T1/en not_active IP Right Cessation
- 1994-06-09 DE DE59408713T patent/DE59408713D1/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8221590B2 (en) | 2008-12-18 | 2012-07-17 | Voith Patent Gmbh | Headbox for a machine for producing a fibrous web |
| US8236137B2 (en) | 2008-12-18 | 2012-08-07 | Voith Patent Gmbh | Headbox for a machine for producing a fibrous web |
| US8236138B2 (en) | 2008-12-18 | 2012-08-07 | Voith Patent Gmbh | Headbox for a machine for producing a fibrous web |
Also Published As
| Publication number | Publication date |
|---|---|
| DE59408713D1 (en) | 1999-10-14 |
| EP0629739A1 (en) | 1994-12-21 |
| DE4320243A1 (en) | 1994-12-22 |
| ATE184336T1 (en) | 1999-09-15 |
| EP0629739B2 (en) | 2006-04-19 |
| DE4320243C2 (en) | 1996-02-22 |
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