EP0708201B1 - Head box of a paper machine - Google Patents
Head box of a paper machine Download PDFInfo
- Publication number
- EP0708201B1 EP0708201B1 EP95114603A EP95114603A EP0708201B1 EP 0708201 B1 EP0708201 B1 EP 0708201B1 EP 95114603 A EP95114603 A EP 95114603A EP 95114603 A EP95114603 A EP 95114603A EP 0708201 B1 EP0708201 B1 EP 0708201B1
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- Prior art keywords
- flowbox
- channels
- turbulence
- flow direction
- dividing walls
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/02—Head boxes of Fourdrinier machines
- D21F1/022—Means for injecting material into flow within the headbox
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/02—Head boxes of Fourdrinier machines
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/02—Head boxes of Fourdrinier machines
- D21F1/026—Details of the turbulence section
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/08—Regulating consistency
Definitions
- the invention relates to a headbox Paper machine.
- the stock suspension made from paper contains long fibers, which tend to flake form which changes in density in the resulting Yield paper web; the long fibers also tend to do so align in the direction of flow so that the manufactured Paper web different tensile strengths in Longitudinal and transverse direction.
- the perfect dispersion the fiber is turbulent by application To reach current.
- US 4,504,360 describes a headbox with a Turbulence generator.
- the turbulence insert consists of essentially made up of plates of different thicknesses the machine width between the cover plate and the Bottom plate of the headbox run.
- the dilutions and thickening of the panels and the surfaces of the cover and base plate are designed so that the Flow cross section in the respective channel of the Headbox steadily reduced and over the Machine width is the same, so that a continuous Acceleration or deceleration of the stock suspension causes becomes. This will dissolve the in the stock suspension aimed at existing flakes.
- the disadvantage of this embodiment is that an adjustment of the Headbox on different material composition and machine speed is only possible to a limited extent. Furthermore, it is disadvantageous that a targeted adjustment that formed by the plates of the turbulence insert Channels on, across the width of the headbox different, Throughputs are not possible.
- DE-OS 15 61 686 describes a headbox for a Paper machine with flow chambers, their boundary walls run discontinuously in order to generate turbulence.
- this Document is also an embodiment with several Channels shown, also with trip hazards that in Flow path for turbulence generation are provided. This Embodiments have not been found to be effective.
- JP 5-13 28 85 (A) describes a headbox with a flow channel, its flow desk discontinuous for turbulence generation run.
- the discontinuity is caused by boundary surfaces that act as structural panels are trained.
- These structure plates have a turbulence-generating corrugated surface structure, which from perpendicular to the flow direction running waves is formed on.
- This embodiment also has Practice unsatisfied.
- DE 40 19 593 A1 shows a sectioned headbox over its width away in one of the turbulence generator or the grid (perforated plate) in Flow direction of the fibrous suspension upstream chamber Partitions is divided into sections, the turbulence generator in known Way equipped as a tube bundle is.
- DE 42 39 644 A1 discloses a headbox for a paper machine, wherein in an area between the first and the last chamber at least two Walls are provided, the contours of which are designed such that the lines the minima or maxima of the surface with the lines of the minima or maxima the opposite surface has an angle deviating from 0 ° or 180 ° form so that the flowing through between the wall pairs Stock suspension changes in direction transverse to the main flow direction of the Performs stock suspension.
- the object of the invention is to provide a headbox for a paper machine create with which the dispersion of the paper fibers is improved and the mechanical properties of a paper web produced as low as possible Differences in the transverse or longitudinal direction exhibit. Furthermore, there should be the opportunity to to different paper machine speeds and Material suspension properties in a simple way adjust, the setting options via the Machine width should be different.
- Channel width and thus the cross section of the individual channel variable can for example, by slidable plates happen so that at one Shift along or across the flow direction itself changing sections of different acceleration and Braking or turbulence result.
- the degree of turbulence on the one hand, but on the other a change in throughput can also be set.
- the possible design corresponds to Surface of the channels of the valve designs according to DE 42 39 643.
- Figure 5 shows a longitudinal section through the schematic Building a conventional headbox with the four Areas I, pre-chamber II, turbulence area III and outlet area IV.
- the feed in the form of a paraboloid Transverse distribution pipe from which the stock suspension is introduced in antechambers and then one, out many tubular ducts, turbulence insert is led to the outlet area.
- Figure 1 shows a headbox with an embodiment according to the first aspect of the invention, according to which - with respect Feed I, pre-chamber II and outlet area IV - conventional headbox with a turbulence area III equipped according to the first aspect of the invention is. Accordingly, the turbulence range shown exists from a variety of oblong to the flow direction Channels that are adjustable in their cross section are.
- the cross sections of the channels are also possible individually adjust so that a sectional regulation of the degree of turbulence and the throughput is also possible.
- FIG. 2 shows a further development of the inventive concept, in contrast to the embodiment in FIG. 1 of the suspension head area I of the headbox consisting of a large number of mixers into which two suspension streams Q H and Q L are fed, which combine to form sectional overall streams ,
- this embodiment of the concept of the invention there is a particular advantage in that, on the one hand, regulated stock suspension flows are fed to the mixers, which in turn lead to sectionally adjustable volume flows with adjustable density and / or sectional total volume flow; on the other hand, due to the use of adjustable cross-sections in the turbulence area III, there is an optimal adaptation to different stock suspension throughputs through the headbox and thus to a wide range of paper thicknesses or machine speeds to be produced.
- each mixer influences a "packet" of channels and thus also affects the consistency or amount of suspension in the corresponding section.
- the assignment can relate both horizontally and vertically arranged packages, or both combined, so that both individual sections - based on the width - and individual layers - based on the height of the material jet - can be influenced.
- Figure 3 finally shows a more constructive embodiment the headbox in which those shown in Figure 2 Elements are integrated in a stabilizing housing, which affects the stability of the headbox Can give advantages.
- FIG. 4 shows an embodiment in a perspective section of the turbulence area III according to the invention of a headbox.
- the direction of flow of the stock suspension is shown by the arrow S.
- the turbulence area of the headbox is machine-wide divided into sections with a section width B s by partitions T, these partitions T extending from the top to the bottom structural plate S and at the same time serving as a tie rod between these plates.
- the structure plates are each provided with surface structures on the side facing the suspension, which create turbulence in the material suspension flowing past.
Abstract
Description
Die Erfindung betrifft einen Stoffauflauf einer Papiermaschine.The invention relates to a headbox Paper machine.
Ein Problem bei der Herstellung von Papier mit möglichst gleichmäßiger Struktur und Dicke und auch Faserorientierung über die gesamte Maschinenbreite liegt in der Konsistenzverteilung der Stoffsuspension aus der Papier hergestellt wird. Die Stoffsuspension zur Papierherstellung enthält lange Fasern, welche dazu neigen zum einen Flocken zu bilden wodurch sich Dichteänderungen in der entstehenden Papierbahn ergeben; außerdem neigen die langen Fasern dazu sich in Strömungsrichtung auszurichten, so daß die hergestellte Papierbahn unterschiedliche Zugfestigkeiten in Längs- und Querrichtung besitzt. Die einwandfreie Dispergierung der Fasern ist durch Anwendung einer turbulenten Strömung zu erreichen.A problem in making paper with as much as possible uniform structure and thickness and also fiber orientation The consistency distribution lies across the entire machine width the stock suspension made from paper becomes. The stock suspension for papermaking contains long fibers, which tend to flake form which changes in density in the resulting Yield paper web; the long fibers also tend to do so align in the direction of flow so that the manufactured Paper web different tensile strengths in Longitudinal and transverse direction. The perfect dispersion the fiber is turbulent by application To reach current.
Zur Vermeidung von Flockenbildung und zur Vermeidung einer gerichteten Faserausrichtung werden daher Stoffaufläufe mit Turbulenzeinsätzen unterschiedlicher Ausbildung eingesetzt.To avoid flaking and to avoid a directional fiber alignment are therefore using headboxes Turbulence inserts of different training used.
US 4 504 360 beschreibt einen Stoffauflauf mit einem Turbulenzeinsatz. Der Turbulenzeinsatz besteht im wesentlichen aus Platten unterschiedlicher Dicke, die über die Maschinenbreite hinweg zwischen der Deckplatte und der Bodenplatte des Stoffauflaufes verlaufen. Die Verdünnungen und Verdickungen der Platten und der Oberflächen der Deck- und Bodenplatte sind derart gestaltet, daß sich der Strömungsquerschnitt im jeweils betrachteten Kanal des Stoffauflaufes stetig verringert und über die Maschinenbreite hinweg gleich ist, so daß eine stetige Beschleunigung bzw. Verzögerung der Stoffsuspension bewirkt wird. Hierdurch wird eine Auflösung der in der Stoffsuspension vorhandenen Flocken angestrebt. US 4,504,360 describes a headbox with a Turbulence generator. The turbulence insert consists of essentially made up of plates of different thicknesses the machine width between the cover plate and the Bottom plate of the headbox run. The dilutions and thickening of the panels and the surfaces of the cover and base plate are designed so that the Flow cross section in the respective channel of the Headbox steadily reduced and over the Machine width is the same, so that a continuous Acceleration or deceleration of the stock suspension causes becomes. This will dissolve the in the stock suspension aimed at existing flakes.
Nachteil dieser Ausführung ist, daß eine Einstellung des Stoffauflaufes auf unterschiedliche Stoffzusammensetzung und Maschinengeschwindigkeit nur bedingt möglich ist. Weiterhin ist es von Nachteil, daß eine gezielte Anpassung der durch die Platten des Turbulenzeinsatzes gebildeten Kanäle auf, über die Breite des Stoffauflaufes unterschiedliche, Durchsätze nicht möglich ist.The disadvantage of this embodiment is that an adjustment of the Headbox on different material composition and machine speed is only possible to a limited extent. Furthermore, it is disadvantageous that a targeted adjustment that formed by the plates of the turbulence insert Channels on, across the width of the headbox different, Throughputs are not possible.
DE-OS 15 61 686 beschreibt einen Stoffauflauf für eine Papiermaschine mit Strömungskammern, deren Begrenzungswände zwecks Turbulenzerzeugung unstetig verlaufen. In dieser Druckschrift ist auch eine Ausführungsform mit mehreren Kanälen dargestellt, ferner mit Stolperschwellen, die im Strömungsweg zur Turbulenzerzeugung vorgesehen sind. diese Ausführungsformen haben sich als nicht wirksam erwiesen. DE-OS 15 61 686 describes a headbox for a Paper machine with flow chambers, their boundary walls run discontinuously in order to generate turbulence. In this Document is also an embodiment with several Channels shown, also with trip hazards that in Flow path for turbulence generation are provided. this Embodiments have not been found to be effective.
JP 5-13 28 85 (A) beschreibt einen Stoffauflauf mit einem Strömungskanal, dessen Strömungspult Randflächen zwecks Turbulenzerzeugung unstetig verlaufen. Die Unstetigkeit wird von Begrenzungsflächen, die als Strukturplatten ausgebildet sind, erzeugt. Diese Strukturplatten weisen eine turbulenzerzeugende gewellte Oberflächenstruktur, welche von senkrecht zur Strömungsrichtung verlaufenden Wellen gebildet wird, auf. Auch diese Ausführungsform hat in der Praxis nicht befriedigt.JP 5-13 28 85 (A) describes a headbox with a flow channel, its flow desk discontinuous for turbulence generation run. The discontinuity is caused by boundary surfaces that act as structural panels are trained. These structure plates have a turbulence-generating corrugated surface structure, which from perpendicular to the flow direction running waves is formed on. This embodiment also has Practice unsatisfied.
US 5 030 326 zeigt und beschreibt einen Stoffauflauf mit einem Turbulenzeinsatz üblicher Bauart. Soweit erkennbar, weist dieser Turbulenzeinsatz eine Vielzahl von im Querschnitt kreisförmigen Kanälen auf. Der letzte Bereich des Auslaufes ist ebenfalls mit Turbulenz erzeugenden Einrichtungen versehen, und zwar mit gewellten Trennwänden. Diese Trennwände sind jedoch nicht mit dem klassischen Turbulenzeinsatz vergleichbar; sie befinden sich auf dem Strömungswege zu weit stromabwärts, um noch die notwendige Wirkung zu haben.US 5,030,326 shows and describes a headbox with a turbulence insert usual design. As far as can be seen, this turbulence insert has a large number of circularly circular channels. The last area of the spout is also provided with turbulence generating devices, with corrugated partitions. However, these partitions are not with the classic Turbulence insert comparable; they are too far on the flow path downstream to still have the necessary effect.
DE 40 19 593 A1 zeigt einen sektionierten Stoffauflauf, der über seine Breite hinweg in einer der dem Turbulenzerzeuger bzw. der dem Gitter (Lochplatte) in Strömungsrichtung der Faserstoffsuspension vorgeschalteten Kammer durch Trennwände in Sektionen unterteilt ist, wobei der Turbulenzerzeuger in bekannter Weise als Rohrbündel ausgestattet ist.DE 40 19 593 A1 shows a sectioned headbox over its width away in one of the turbulence generator or the grid (perforated plate) in Flow direction of the fibrous suspension upstream chamber Partitions is divided into sections, the turbulence generator in known Way equipped as a tube bundle is.
DE 42 39 644 A1 offenbart einen Stoffauflauf für eine Papiermaschine, wobei in einem Bereich zwischen der ersten und der letzten Kammer mindestens zwei Wandungen vorgesehen sind, deren Konturen derart gestaltet sind, daß die Linien der Minima bzw. Maxima der Oberfläche mit den Linien der Minima bzw. Maxima der gegenüberliegenden Oberfläche eine von 0° bzw. 180° abweichenden Winkel bilden, so daß die zwischen den Wandungspaaren hindurchfließende Stoffsuspension Richtungsänderungen quer zur Hauptströmungsrichtung der Stoffsuspension durchführt.DE 42 39 644 A1 discloses a headbox for a paper machine, wherein in an area between the first and the last chamber at least two Walls are provided, the contours of which are designed such that the lines the minima or maxima of the surface with the lines of the minima or maxima the opposite surface has an angle deviating from 0 ° or 180 ° form so that the flowing through between the wall pairs Stock suspension changes in direction transverse to the main flow direction of the Performs stock suspension.
Aufgabe der Erfindung ist es, einen Stoffauflauf für eine Papiermaschine zu schaffen, mit welchem die Dispergierung der Paperfasern verbessert wird und die mechanischen Eigenschaften einer hergestellten Papierbahn möglichst geringe Unterschiede bezüglich Quer- oder Längsrichtung aufweisen. Weiterhin soll die Möglichkeit bestehen, sich auf unterschiedliche Papiermaschinengeschwindigkeiten und Stoffsuspensionseigenschaften in einfacher Weise einzustellen, wobei die Einstellungsmöglichkeiten über die Maschinenbreite hinweg unterschiedlich sein sollen.The object of the invention is to provide a headbox for a paper machine create with which the dispersion of the paper fibers is improved and the mechanical properties of a paper web produced as low as possible Differences in the transverse or longitudinal direction exhibit. Furthermore, there should be the opportunity to to different paper machine speeds and Material suspension properties in a simple way adjust, the setting options via the Machine width should be different.
Diese Aufgabe wird durch die Merkmale von Anspruch 1 gelöst.This object is achieved by the features of claim 1 solved.
Hierdurch wird erreicht, daß die Dispergierung der Papierfasern verbessert wird, wodurch die Papierqualität gesteigert wird. Außerdem läßt sich ein solcher Turbulenzeinsatz mit den erfindungsgemäßen Kanälen leichter fertigen, als die bekannten Turbulenzeinsätze, deren Kanäle aus Rohrbündeln gebildet sind.This ensures that the dispersion of Paper fiber is improved, reducing paper quality is increased. In addition, such Turbulence use with the channels according to the invention easier manufacture than the known turbulence inserts, their channels are formed from tube bundles.
Gemäß einem besonderen Gedanken der Erfindung ist die Kanalweite und damit der Querschnitt des einzelnen Kanales veränderbar. Eine Veränderung des Querschnittes kann beispielsweise durch gegeneinander verschiebbare Platten geschehen, so daß bei einer Verschiebung längs oder quer zur Strömungsrichtung sich wechselnde Abschnitte unterschiedlicher Beschleunigung und Abbremsung bzw. Turbulenz ergeben. Erfindungsgemäß ist damit einerseits der Grad der Turbulenz, andererseits aber auch eine Änderung des Durchsatzes einstellbar.According to a particular idea of the invention Channel width and thus the cross section of the individual channel variable. A change in the cross section can for example, by slidable plates happen so that at one Shift along or across the flow direction itself changing sections of different acceleration and Braking or turbulence result. According to the invention the degree of turbulence on the one hand, but on the other a change in throughput can also be set.
In einer besonderen Ausführungsform ist auch eine sektionale Einstellung der Kanäle möglich, so daß auch eine sektionale Beeinflussung des Durchsatzes bzw. des Turbulenzgrades möglich ist, wodurch eine gezielte Einstellung des Flächengewichtquerprofils und des Faserorientierungsquerprofils ermöglicht wird.In a special embodiment there is also a sectional one Adjustment of the channels possible, so that a sectional influencing of the throughput or the degree of turbulence is possible, creating a targeted attitude of the basis weight cross profile and the fiber orientation cross profile is made possible.
Gemäß eines weiteren Aspektes der Erfindung ist vorgesehen die oben beschriebene Vielzahl der Kanäle individuell oder blockweise direkt an eine Vielzahl von vorgeschalteten Mischventilen anzuschließen, die durch jeweils mindestens zwei unterschiedliche Stoffsuspensionsströme gespeist werden. Besonders vorteilhaft ist hierbei die Verwendung von Mischventilen, die bei unterschiedlichen Mischungsverhältnissen gleiche Summenströme abgeben, wie es beispielsweise in der DE 42 11 291 dargestellt ist.According to a further aspect of the invention there is provided the variety of channels described above individually or Block by block directly to a large number of upstream Connect mixing valves by at least each fed two different stock suspension flows become. The use is particularly advantageous here of mixing valves with different mixing ratios deliver the same total currents as, for example is shown in DE 42 11 291.
Gemäß der Erfindung entspricht die mögliche Gestaltung der Oberfläche der Kanäle den Ausgestaltungen von Ventilen gemäß der DE 42 39 643.According to the invention, the possible design corresponds to Surface of the channels of the valve designs according to DE 42 39 643.
Weiterhin ist es möglich die Anordnung der, zum Auslaufbereich führenden Kanäle, zu gestalten wie es in den kennzeichnenden Merkmalen der Ansprüche 2 - 6 oder in der Figur 7 dargestellt ist.It is also possible to arrange the, to the outlet area leading channels, as in the distinctive ones Features of claims 2-6 or in the Figure 7 is shown.
Die Erfindung ist anhand der Zeichnungen näher erläutert. Darin ist im übrigen folgendes dargestellt:
- Figur 1 - 3:
- Stoffaufläufe mit Turbulenzbereich entsprechend dem Erfindungsgedanken.
- Figur 4:
- Perspektivischer Ausschnit des Turbulenzbereiches ;
- Figur 5:
- Ein Stoffauflauf gemäß dem Stand der Technik.
- Figure 1 - 3:
- Headboxes with turbulence according to the inventive concept.
- Figure 4:
- Perspective section of the turbulence area;
- Figure 5:
- A headbox according to the state of the art.
Figur 5 zeigt einen Längsschnitt durch den schematischen Aufbau eines konventionellen Stoffauflaufes mit den vier Bereichen Stoffzuführung I, Vorkammer II, Turbulenzbereich III und Auslaufbereich IV. In dem hier dargestellten Fall ist die Stoffzuführung in Form eines paraboloid-förmigen Querverteilrohres ausgeführt, von dem aus die Stoffsuspension in Vorkammern eingeführt wird und dann über einen, aus vielen rohrartigen Kanälen bestehenden, Turbulenzeinsatz zum Auslaufbereich geführt wird.Figure 5 shows a longitudinal section through the schematic Building a conventional headbox with the four Areas I, pre-chamber II, turbulence area III and outlet area IV. In the case shown here is the feed in the form of a paraboloid Transverse distribution pipe, from which the stock suspension is introduced in antechambers and then one, out many tubular ducts, turbulence insert is led to the outlet area.
Im Fall von Figur 5 ist eine Beeinflussung des Querprofils der Papierbahn lediglich durch eine Verstellung einer - hier nicht gezeigten - Blende am Ende des Auslaufbereiches möglich. Allerdings ist in dem dargestellten Stoffauflauf eine Anpassung an wesentlich unterschiedliche Durchsatzmengen nicht möglich.In the case of FIG. 5 there is an influence on the cross profile the paper web simply by adjusting a - not shown here - aperture at the end of the outlet area possible. However, in the headbox shown an adjustment to essential different throughputs not possible.
Figur 1 zeigt einen Stoffauflauf mit einer Ausgestaltung gemäß dem ersten Aspekt der Erfindung, wonach ein - bezüglich Stoffzuführung I, Vorkammer II und Auslaufbereich IV - konventioneller Stoffauflauf mit einem Turbulenzbereich III gemäß dem ersten Aspekt der Erfindung ausgestattet ist. Demnach besteht der dargestellte Turbulenzbereich aus einer Vielzahl von quer zur Strömungsrichtung länglichen Kanälen, die in ihrem Querschnitt einstellbar ausgeführt sind.Figure 1 shows a headbox with an embodiment according to the first aspect of the invention, according to which - with respect Feed I, pre-chamber II and outlet area IV - conventional headbox with a turbulence area III equipped according to the first aspect of the invention is. Accordingly, the turbulence range shown exists from a variety of oblong to the flow direction Channels that are adjustable in their cross section are.
Bei der gezeigten Ausführung in Figur 1 ist es erfindungsgemäß auch möglich die Querschnitte der Kanäle individuell einzustellen, so daß eine sektionale Regulierung des Turbulenzgrades und auch des Durchsatzes möglich ist. Wird in diesem Fall auch noch eine Blendeneinstellung am Auslaufbereich vorgesehen, so ergeben sich schon in dieser Ausführungsform beste Anpassungsmöglichkeiten an unterschiedliche Durchsätze und gleichzeitige Einflußnahmemöglichkeiten auf das Querprofil der erzeugten Papierbahn bezüglich Gewicht, Faserorientierung und durch die Beeinflussung des Turbulenzgrades auch bezüglich der Flockigkeit der erzeugten Papierbahn.In the embodiment shown in Figure 1, it is according to the invention the cross sections of the channels are also possible individually adjust so that a sectional regulation of the degree of turbulence and the throughput is also possible. Is in in this case also an aperture setting at the outlet area provided, so result in this embodiment best possible adaptation to different Throughputs and simultaneous opportunities to exert influence the cross profile of the paper web produced in terms of weight, Fiber orientation and by influencing the degree of turbulence also with regard to the flakiness of the produced Paper web.
Figur 2 zeigt eine weitere Ausbildung des Erfindungsgedanken, wobei im Unterschied zur Ausführung in Figur 1 der Suspension zuführende Bereich I des Stoffauflaufes aus einer Vielzahl von Mischern besteht, in die jeweils zwei Suspensionströme QH und QL zugeführt werden, die sich zu sektionalen Gesamtströmen vereinigen. Bei dieser Ausgestaltung des Erfindungsgedanken besteht ein besonderer Vorteil darin, daß einerseits geregelte Stoffsuspensionströme den Mischern zugeführt werden, die ihrerseits zu sektional einstellbaren Volumenströmen mit einstellbarer Dichte und/oder sektionalem Gesamtvolumenstrom führen; andereseits besteht aufgrund des Einsatzes von einstellbaren Querschnitten im Turbulenzbereich III eine optimale Anpassung an unterschiedliche Stoffsuspensionsdurchsätze durch den Stoffauflauf und damit an eine große Bandbreite von zu erzeugenden Papierdicken bzw. Maschinengeschwindigkeiten. Wahlweise ist es hierbei auch möglich jedem einzelnen Mischer eine Anzahl von zu speisenden Kanälen zuzuordnen, so daß jeder Mischer ein "Paket" an Kanälen beeinflußt und damit auch die Stoffdichte bzw. Suspensonsmenge in der korrespondierenden Sektion beeinflußt. Die Zuordnung kann sowohl horizontal als auch vertikal angeordnete Pakete, als auch beides kombiniert betreffen, wodurch damit sowohl einzelne Sektionen - bezogen auf die Breite - als auch einzelne Schichten - bezogen auf die Höhe des Stoffstrahls - beeinflußbar sind. FIG. 2 shows a further development of the inventive concept, in contrast to the embodiment in FIG. 1 of the suspension head area I of the headbox consisting of a large number of mixers into which two suspension streams Q H and Q L are fed, which combine to form sectional overall streams , In this embodiment of the concept of the invention, there is a particular advantage in that, on the one hand, regulated stock suspension flows are fed to the mixers, which in turn lead to sectionally adjustable volume flows with adjustable density and / or sectional total volume flow; on the other hand, due to the use of adjustable cross-sections in the turbulence area III, there is an optimal adaptation to different stock suspension throughputs through the headbox and thus to a wide range of paper thicknesses or machine speeds to be produced. Optionally, it is also possible to assign a number of channels to be fed to each individual mixer, so that each mixer influences a "packet" of channels and thus also affects the consistency or amount of suspension in the corresponding section. The assignment can relate both horizontally and vertically arranged packages, or both combined, so that both individual sections - based on the width - and individual layers - based on the height of the material jet - can be influenced.
Figur 3 zeigt schließlich eine mehr konstruktive Ausgestaltung des Stoffauflaufes, in der die in Figur 2 gezeigten Elemente in ein stabilisierendes Gehäuse integriert werden, wodurch sich bezüglich der Stabilität des Stoffauflaufes Vorteile ergeben können.Figure 3 finally shows a more constructive embodiment the headbox in which those shown in Figure 2 Elements are integrated in a stabilizing housing, which affects the stability of the headbox Can give advantages.
Bezüglich der Figuren 1 - 3 sei noch darauf hingewiesen, daß die Vorkammer II bei einer strömungsmäßig günstigen Ausgestaltung der Suspensionszuführung im Abschnitt I nicht unbedingt notwendig ist.With regard to FIGS. 1-3, it should also be pointed out that the antechamber II at a favorable flow Design of the suspension feed in Section I is not is absolutely necessary.
Figur 4 zeigt eine Ausgestaltung in einem perspektivischen Ausschnitt des erfindungsgemäßen Turbulenzbereichs III eines Stoffauflaufes. Die Strömungsrichtung der Stoffsuspension ist durch den Pfeil S dargestellt. Bei der dargestellten Ausführungsform ist der Turbulenzbereich des Stoffauflaufes maschinenbreit in Sektionen mit einer Sektionsbreite Bs durch Trennwände T unterteilt, wobei diese Trennwände T sich von der oben liegenden zur untenliegenden Strukturplatte S erstrecken und gleichzeitig als Zuganker zwischen diesen Platten dienen können. Die Strukturplatten sind auf der suspensionszugewandten Seite jeweils mit Oberflächenstrukturen versehen, die eine Turbulenz in der vorbeifließenden Stoffsuspension erzeugen. Um Markierungen in der Papierbahn durch die Trennwände zu vermeiden kann es notwendig sein am Ende der Trennwände noch eine Nachlaufstrecke SN vorzusehen. Weiterhin kann es vorteilhaft sein an Stelle von stumpf endenden Trennwänden auch solche zu verwenden, die spitz auslaufen.FIG. 4 shows an embodiment in a perspective section of the turbulence area III according to the invention of a headbox. The direction of flow of the stock suspension is shown by the arrow S. In the embodiment shown, the turbulence area of the headbox is machine-wide divided into sections with a section width B s by partitions T, these partitions T extending from the top to the bottom structural plate S and at the same time serving as a tie rod between these plates. The structure plates are each provided with surface structures on the side facing the suspension, which create turbulence in the material suspension flowing past. In order to avoid markings in the paper web by the partition walls, it may be necessary to provide a trailing section S N at the end of the partition walls. It may also be advantageous to use blunt-ended partitions instead of blunt-ended partitions.
Claims (19)
- Flowbox for a paper machine, having a machine-width flow chamber which has an inlet and an outlet,
having a turbulence inset which can be incorporated into the flow chamber and which has a large number of channels, which each have an upper boundary surface and
a lower boundary surface, the upper boundary surface and the lower boundary surface being formed as structured plates (So, Su), which have a corrugated surface structure that generates turbulence,
a cross-sectional area of the individual channel - as viewed in a section at right angles to the flow direction (S) - being at least twice as long as it is wide, and
the corrugations formed by the surface structure of the structured plates (So, Su) running at an angle of less than 90° to the flow direction (S),
characterized in that the channels over the machine width are subdivided by dividing walls (T) in sections having a respective section width (Bs),
in that the dividing walls (T) extend from the upper structured plate (So) to the lower structured plate (Su) and
in that the dividing walls (T) serve as tie rods between the upper structured plate (So) and the lower structured plate (Su). - Flowbox according to Claim 1, characterized in that the channels are of elongated design at right angles to the flow direction (S), and in that the cross sections of the channels can be adjusted for the purpose of sectional control of the level of turbulence or of the throughput.
- Flowbox according to Claim 2, characterized in that the corrugated surface structures generating the turbulence are located on the longitudinal sides respectively facing the suspension of the individual elongated channel at right angles to the flow direction (S).
- Flowbox according to one of Claims 1-3, characterized in that the channels run horizontally and each individual channel extends at most over half the machine width.
- Flowbox according to one of Claims 1-3, characterized in that the channels run horizontally and each individual channel extends at most over one third or one quarter of the machine width.
- Flowbox according to one of Claims 1-5, characterized in that the channels are formed with the aid of a large number of plates.
- Flowbox according to Claim 6, characterized in that the plates of the channels can be displaced in the flow direction.
- Flowbox according to Claim 6 or 7, characterized in that the distances of the plates from one another can be varied.
- Flowbox according to Claims 1-8, characterized in that the dividing walls (T) extend in the flow direction (S).
- Flowbox according to one of Claims 1-9, characterized in that the dividing walls (T) - as viewed in the flow direction S - have a shorter length than the structured plates (So, Su).
- Flowbox according to one of Claims 1-10, characterized in that the dividing walls (T) - as viewed in the flow direction (S) - each have an end running out bluntly.
- Flowbox according to one of Claims 1-11, characterized in that the dividing walls (T) - as viewed in the flow direction (S) - each have an end running out sharply.
- Flowbox according to one of Claims 1-12, characterized in that stock suspension is fed in via a large number of feed lines distributed over the machine width.
- Flowbox according to Claim 13, characterized in that each individual line is associated with just one channel in the turbulence region.
- Flowbox according to Claim 13, characterized in that each individual line is associated with a plurality of channels or a plurality of adjacent channels in the turbulence region.
- Flowbox according to one of Claims 13-15, characterized in that at least one feed line has a restrictor device connected upstream.
- Flowbox according to one of Claims 13-16, characterized in that at least one feed line has a mixing valve connected upstream.
- Flowbox according to Claim 17, characterized in that each mixing valve can be supplied with in each case at least two stock suspension streams having different characteristics with regard to composition and/or throughput.
- Flowbox according to one of Claims 1-18, characterized in that in the flowbox is a multi-layer flowbox.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4433445 | 1994-09-20 | ||
| DE4433445A DE4433445C1 (en) | 1994-09-20 | 1994-09-20 | Headbox of a paper machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0708201A1 EP0708201A1 (en) | 1996-04-24 |
| EP0708201B1 true EP0708201B1 (en) | 2003-01-02 |
Family
ID=6528661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95114603A Expired - Lifetime EP0708201B1 (en) | 1994-09-20 | 1995-09-16 | Head box of a paper machine |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5741401A (en) |
| EP (1) | EP0708201B1 (en) |
| AT (1) | ATE230453T1 (en) |
| CA (1) | CA2158677A1 (en) |
| DE (2) | DE4433445C1 (en) |
| FI (1) | FI113553B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6264796B1 (en) | 1999-07-13 | 2001-07-24 | The Mead Corporation | Headbox diffuser |
| DE19937302A1 (en) * | 1999-08-10 | 2001-02-15 | Voith Paper Patent Gmbh | Stock inlet for papermaking machine has turbulence insert with structured turbulence channels shaped with expansion zones to prevent stripe effects and reduce or eliminate flow instabilities |
| DE10308555A1 (en) * | 2003-02-27 | 2004-10-21 | Voith Paper Patent Gmbh | headbox |
| DE102004000052A1 (en) * | 2004-11-19 | 2006-05-24 | Voith Paper Patent Gmbh | Headbox for a machine for producing a fibrous web, in particular a paper or board web |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4019593A1 (en) * | 1990-06-20 | 1992-01-09 | Voith Gmbh J M | FABRIC DRAIN FOR PAPER MACHINES |
| DE4239644A1 (en) * | 1992-11-26 | 1994-06-01 | Voith Gmbh J M | Paper making stock inlet - has sliding wall in pair between first and final chambers to modify suspension flow to give pulp with evenly distributed fibres |
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| DE370422C (en) * | 1923-03-02 | Max Wenzel | Device for achieving good mixing of the stock water and increased cross storage of fibers on fourdrinier paper machines with stock outlet nozzle arranged on the stock box | |
| NO119299B (en) * | 1962-04-12 | 1970-04-27 | Karlstad Mekaniska Ab | |
| GB1179847A (en) * | 1966-09-01 | 1970-02-04 | St Annes Board Mill Co Ltd | Flowbox |
| US3514372A (en) * | 1966-11-29 | 1970-05-26 | Beloit Corp | Headbox method and means for blending of multiple jets |
| DE1941424C3 (en) * | 1969-08-14 | 1980-07-10 | Escher Wyss Gmbh, 7980 Ravensburg | Headbox for a paper machine |
| US3652392A (en) * | 1969-11-24 | 1972-03-28 | Kimberly Clark Co | Contracting pre-slice flow distributor for papermaking machine headbox |
| US3661605A (en) * | 1970-06-08 | 1972-05-09 | American Home Prod | Release product |
| US3843470A (en) * | 1970-08-31 | 1974-10-22 | Beloit Corp | Flexible trailing elements in a paper-making machine headbox having projections thereon extending into the slurry flow |
| US3791918A (en) * | 1972-03-08 | 1974-02-12 | Valmet Oy | Headbox of a paper making machine having multiple, vertically inclined vanes |
| US3939037A (en) * | 1973-03-27 | 1976-02-17 | Beloit Corporation | Headbox with flexible trailing elements |
| AT331631B (en) * | 1973-07-13 | 1976-08-25 | Voith Gmbh J M | FUEL DRAIN FOR PAPER MACHINES ETC. |
| FI56987C (en) * | 1976-08-20 | 1980-05-12 | Valmet Oy | SYSTEM FOER STABILIZERING AV MASSASUSPENSIONSTROEMMEN I EN HYDRAULISK INLOPPSLAODA I EN PAPPERSMASKIN |
| US4133713A (en) * | 1977-10-11 | 1979-01-09 | The Procter & Gamble Company | Microturbulence generator for papermachine headbox |
| DE2942966C2 (en) * | 1979-10-24 | 1984-04-26 | J.M. Voith Gmbh, 7920 Heidenheim | Headbox nozzle |
| SE446889B (en) * | 1980-08-05 | 1986-10-13 | Mitsubishi Heavy Ind Ltd | INPUT CHARGE ON A PAPER MACHINE |
| DE3269807D1 (en) * | 1981-07-31 | 1986-04-17 | Mitsubishi Heavy Ind Ltd | A flow rectifier |
| JPS602792A (en) * | 1983-06-20 | 1985-01-09 | 三菱重工業株式会社 | Headbox of papermaking machine |
| US4566945A (en) * | 1984-04-11 | 1986-01-28 | Beloit Corporation | Headbox trailing element |
| DE3514554C3 (en) * | 1984-09-19 | 1998-01-08 | Escher Wyss Gmbh | Headbox device for a paper machine and method for its operation |
| US4687548A (en) * | 1984-10-31 | 1987-08-18 | Valmet Oy | Method and apparatus for controlling distortion of fibre orientation in a paper web |
| US4604164A (en) * | 1985-01-30 | 1986-08-05 | Mitsubishi Jukogyo Kabushiki Kaisha | Flow restraining elements in the headbox of a paper machine |
| JPH06102879B2 (en) * | 1985-07-30 | 1994-12-14 | 石川島播磨重工業株式会社 | Paper machine headbox |
| DE3535849A1 (en) * | 1985-10-08 | 1987-04-09 | Voith Gmbh J M | Setting device for the lip of a papermachine hatbox |
| FR2631353A1 (en) * | 1988-05-13 | 1989-11-17 | Semti | PASTA MIXED FEEDING DEVICE |
| FI79363C (en) * | 1988-09-26 | 1989-12-11 | Valmet Paper Machinery Inc | FOERFARANDE OCH ANORDNING I INLOPPSLAODAN AV EN PAPPERSMASKIN FOER ATT BEHAERSKA FOERDELNINGEN I PAPPERSBANANS FIBERORIENTERING. |
| FI82085C (en) * | 1989-06-02 | 1991-01-10 | Valmet Paper Machinery Inc | Turbulence generator in the inlet box of a paper machine |
| US5030360A (en) * | 1989-09-13 | 1991-07-09 | Murray Grainger | Liquid-laden asbestos compactor and method for removing liquids from asbestos |
| US5183537A (en) * | 1991-10-07 | 1993-02-02 | Beloit Technologies, Inc. | Headbox tube bank apparatus and method of directing flow therethrough |
| JPH05132885A (en) * | 1991-11-12 | 1993-05-28 | Mitsubishi Heavy Ind Ltd | Head box of paper machine |
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-
1994
- 1994-09-20 DE DE4433445A patent/DE4433445C1/en not_active Expired - Lifetime
-
1995
- 1995-09-16 AT AT95114603T patent/ATE230453T1/en active
- 1995-09-16 DE DE59510520T patent/DE59510520D1/en not_active Expired - Lifetime
- 1995-09-16 EP EP95114603A patent/EP0708201B1/en not_active Expired - Lifetime
- 1995-09-19 FI FI954413A patent/FI113553B/en not_active IP Right Cessation
- 1995-09-20 CA CA002158677A patent/CA2158677A1/en not_active Abandoned
-
1997
- 1997-02-13 US US08/799,443 patent/US5741401A/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4019593A1 (en) * | 1990-06-20 | 1992-01-09 | Voith Gmbh J M | FABRIC DRAIN FOR PAPER MACHINES |
| DE4239644A1 (en) * | 1992-11-26 | 1994-06-01 | Voith Gmbh J M | Paper making stock inlet - has sliding wall in pair between first and final chambers to modify suspension flow to give pulp with evenly distributed fibres |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2158677A1 (en) | 1996-03-21 |
| EP0708201A1 (en) | 1996-04-24 |
| US5741401A (en) | 1998-04-21 |
| FI113553B (en) | 2004-05-14 |
| FI954413A (en) | 1996-03-21 |
| DE4433445C1 (en) | 1996-03-28 |
| FI954413A0 (en) | 1995-09-19 |
| ATE230453T1 (en) | 2003-01-15 |
| DE59510520D1 (en) | 2003-02-06 |
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