EP1911878B1 - Headbox - Google Patents

Headbox Download PDF

Info

Publication number
EP1911878B1
EP1911878B1 EP07118009A EP07118009A EP1911878B1 EP 1911878 B1 EP1911878 B1 EP 1911878B1 EP 07118009 A EP07118009 A EP 07118009A EP 07118009 A EP07118009 A EP 07118009A EP 1911878 B1 EP1911878 B1 EP 1911878B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
offset
headbox
lip
baffle
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.)
Not-in-force
Application number
EP07118009A
Other languages
German (de)
French (fr)
Other versions
EP1911878A3 (en
EP1911878A2 (en
Inventor
Wolfgang Ruf
Torben Schlieckau
Markus Häußler
Klaus Lehleiter
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.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
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 Voith Patent GmbH filed Critical Voith Patent GmbH
Priority to PL07118009T priority Critical patent/PL1911878T3/en
Publication of EP1911878A2 publication Critical patent/EP1911878A2/en
Publication of EP1911878A3 publication Critical patent/EP1911878A3/en
Application granted granted Critical
Publication of EP1911878B1 publication Critical patent/EP1911878B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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

Definitions

  • the invention relates to a headbox for a machine for producing a fibrous web, in particular paper or board web, with a nozzle for producing a suspension jet comprising a first lip provided with a diaphragm and a second lip opposite thereto, wherein a nozzle channel between the two nozzle lips defined and the aperture is provided in the region of the nozzle outlet opening, wherein the second nozzle lip has a projecting towards the center plane of the nozzle channel offset, wherein the offset viewed in the direction of the suspension jet expediently begins before or after the aperture and wherein the offset is considered in the direction of the suspension jet extends beyond the end of the first nozzle lip provided with the diaphragm.
  • Such a headbox of the type mentioned is, for example, from the document DE 30 47 998 A1 known.
  • DE 43 23 050 C1 and DE 40 05 147 A1 in each case a headbox for a machine for producing a fibrous web, in particular paper or board web, with a nozzle for producing a suspension jet.
  • the respective nozzle comprises a first lip provided with a diaphragm and a second lip opposite thereto, a nozzle channel being defined between the two nozzle lips and the diaphragm being provided in the region of the nozzle outlet opening.
  • the document DE 10 2004 047 879 A1 discloses a headbox of a machine for producing a fibrous web from at least one pulp suspension, with a headbox having an upper nozzle wall and a lower nozzle wall and two side walls, tapering to an outlet and an interior space traversed by the pulp suspension.
  • a diaphragm which can be displaced by means of several elements and is arranged over the machine width is arranged on the outlet side.
  • the diaphragm has a main surface which is touched by the at least one pulp suspension and runs parallel to the inner surface of the upper nozzle wall.
  • the diaphragm can have a diaphragm board in the range of -2 to +6 mm, preferably in the range of -0.5 to +2.5 mm, in particular in the range of -0.5 to 0 mm or in the range of 0 to +2 , 5 mm.
  • One of the two nozzle lips of a headbox is usually smooth in the flow direction and projects beyond the aperture provided on the opposite nozzle lip.
  • the smooth shape ensures that there is no beam contraction and thus suspension acceleration.
  • the suspension jet is contracted on the baffle side of the headbox and the suspension accelerated accordingly, resulting in different flow conditions on the top and bottom of the suspension jet and ultimately in the paper in terms of speed and turbulence.
  • different degrees of orientation in the z-direction of the fibrous web can be generated.
  • the result may be curls (curling), for example, in copy paper or other flatness problems (cockling, fluting).
  • a first nozzle lip 12 provided with a diaphragm faces a smooth second nozzle lip 14.
  • the diaphragm 10 protrudes toward the opposite second nozzle lip 14 so that the suspension or material jet 16 contracts on the diaphragm side of the headbox and the suspension is correspondingly accelerated.
  • the invention has for its object to provide an improved headbox of the type mentioned, in which the suspension jet generated in terms of speed and turbulence in the thickness or z-direction has a greater symmetry, whereby the quality of the final product and in particular improves the flatness becomes.
  • a partial control of the profiling should be possible in the z direction, if a symmetrical paper is not yet optimal for the application.
  • this object is achieved in that the second nozzle lip has a projecting towards the center plane of the nozzle channel offset, wherein viewed in the direction of the suspension beam of the diaphragm located portion of the offset is shorter than that behind the diaphragm lying portion of the offset.
  • the suspension jet is contracted and accelerated on the relevant side, so that it receives at least a similar characteristic with respect to turbulence and speed as on the diaphragm side.
  • the distance between the offset and the center plane of the nozzle channel is at least substantially the same size as the distance between the aperture and the median plane of the nozzle channel.
  • the offset relative to the plane of the surface of the second nozzle lip adjoining the nozzle channel can advantageously protrude by an amount which is in the range of the amount by which the aperture is opposite that of the nozzle channel protruding surface of the first nozzle lip protrudes.
  • the offset and the diaphragm are advantageously present in each case by an amount in the range of about 0.2 to about 0.6 mm, preferably by an amount in the range of about 0.5 to 0.3 mm.
  • the transition between the adjacent to the nozzle channel surface of the second nozzle lip and the offset is rounded.
  • the geometry of the offset is preferably designed as a curve without sharp edges, a flow separation of the respective nozzle wall and consequently deposits and jet disturbances are avoided.
  • the headbox according to the invention is advantageously used in particular as a single-layer headbox and for wood-free papers.
  • the generated suspension jet can be made more symmetrical in terms of speed and turbulence in the thickness or in the z-direction, whereby the paper quality can be improved accordingly and in particular a flat layer can be produced. If a symmetrical paper should not be optimal for the application, the profiling in the z-direction can be partially controlled due to the inventive solution.
  • FIG. 2 shows a schematic partial representation of an exemplary embodiment of a headbox 18 according to the invention for a machine for producing a fibrous web, in particular paper or board web.
  • the headbox 18 comprises a nozzle 20 for generating a suspension jet, which has a first lip 24 provided with a diaphragm 22 and a second lip 26 opposite thereto. Between the two Nozzle lips 24, 26, a nozzle channel 28 is defined. The aperture 22 is provided in the region of the nozzle outlet opening 30.
  • the second nozzle lip 26 has an offset 34 projecting towards the middle plane 32 of the nozzle channel 28.
  • the distance between the offset 34 and the center plane 32 of the nozzle channel 28 is at least substantially equal to the distance between the aperture 22 and the central plane 32 of the nozzle channel 28 at least substantially.
  • the offset 34 can thus protrude with respect to the plane 36 'of the surface 36 of the second nozzle lip 26 adjoining the nozzle channel 38 by an amount 38 which lies in the region of the amount 40 in that the diaphragm 22 protrudes from the surface 42 of the first nozzle lip 24 adjoining the nozzle channel 28.
  • the offset 34 begins in the direction of the suspension jet 44 viewed in front of the diaphragm 22. In this case, the offset 34 extends in the direction of the suspension jet 44 viewed beyond the aperture 22 provided with the end of the first nozzle lip 24 also.
  • the viewed in the direction of the suspension beam 44 in front of the diaphragm 22 portion of the offset 34 is shorter than the underlying section.
  • transition between the surface 36 of the second nozzle lip 26 adjoining the nozzle channel 28 and the offset 34 is advantageously rounded, as shown in FIG. 2 is indicated by an arrow labeled "R". Also the Transition between the edge 46 and the adjoining to the mid-plane 32 parallel portion of the offset 34 is rounded again. This rounding is again indicated by an arrow marked "R”.
  • the offset 34 begins at a distance I 'in front of the aperture 22nd

Landscapes

  • Paper (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Abstract

Headbox for cardboard- and papermaking machines has baffle (22) at the outlet end of the lower lip (24) of the nozzle. The upper lip (26) has an inwardly-projecting tip (34). An independent claim is included for a double layer headbox with a nozzle divided longitudinally by a central partition and with baffle fitted on each of its lips.

Description

Die Erfindung betrifft einen Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn, insbesondere Papier- oder Kartonbahn, mit einer Düse zur Erzeugung eines Suspensionsstrahles, die eine mit einer Blende versehene erste Lippe und eine dieser gegenüberliegende zweite Lippe umfasst, wobei zwischen den beiden Düsenlippen ein Düsenkanal definiert und die Blende im Bereich der Düsenaustrittsöffnung vorgesehen ist, wobei die zweite Düsenlippe einen zur Mittenebene des Düsenkanals hin vorspringenden Versatz aufweist, wobei der Versatz in Richtung des Suspensionsstrahles betrachtet zweckmäßigerweise vor oder nach der Blende beginnt und wobei sich der Versatz in Richtung des Suspensionsstrahls betrachtet über das mit der Blende versehene Ende der ersten Düsenlippe hinaus erstreckt.The invention relates to a headbox for a machine for producing a fibrous web, in particular paper or board web, with a nozzle for producing a suspension jet comprising a first lip provided with a diaphragm and a second lip opposite thereto, wherein a nozzle channel between the two nozzle lips defined and the aperture is provided in the region of the nozzle outlet opening, wherein the second nozzle lip has a projecting towards the center plane of the nozzle channel offset, wherein the offset viewed in the direction of the suspension jet expediently begins before or after the aperture and wherein the offset is considered in the direction of the suspension jet extends beyond the end of the first nozzle lip provided with the diaphragm.

Ein solcher Stoffauflauf der eingangs genannten Art ist beispielsweise aus dem Document DE 30 47 998 A1 bekannt.Such a headbox of the type mentioned is, for example, from the document DE 30 47 998 A1 known.

Ferner offenbaren die Dokumente EP 1 568 820 A1 , DE 43 23 050 C1 und DE 40 05 147 A1 jeweils einen Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn, insbesondere Papier- oder Kartonbahn, mit einer Düse zur Erzeugung eines Suspensionsstrahles. Die jeweilige Düse umfasst eine mit einer Blende versehene erste Lippe und eine dieser gegenüberliegende zweite Lippe, wobei zwischen den beiden Düsenlippen ein Düsenkanal definiert und die Blende im Bereich der Düsenaustrittsöffnung vorgesehen ist.Further, the documents reveal EP 1 568 820 A1 . DE 43 23 050 C1 and DE 40 05 147 A1 in each case a headbox for a machine for producing a fibrous web, in particular paper or board web, with a nozzle for producing a suspension jet. The respective nozzle comprises a first lip provided with a diaphragm and a second lip opposite thereto, a nozzle channel being defined between the two nozzle lips and the diaphragm being provided in the region of the nozzle outlet opening.

Das Dokument DE 10 2004 047 879 A1 offenbart einen Stoffauflauf einer Maschine zur Herstellung einer Faserstoffbahn aus mindestens einer Faserstoffsuspension, mit einer eine obere Düsenwand und eine untere Düsenwand sowie zwei Seitenwände aufweisenden, sich zu einem Auslauf verjüngenden und einen von der Faserstoffsuspension durchströmten Innenraum aufweisenden Stoffauflaufdüse. An der oberen Düsenwand ist auslaufseitig eine mittels mehrerer Elemente verschiebbare und sich über die Maschinenbreite erstreckende Blende angeordnet. Die Blende weist eine von der mindestens einen Faserstoffsuspension berührte Hauptfläche auf, die parallel zur Innenfläche der oberen Düsenwand verläuft. Überdies kann die Blende einen Blendenvorstand im Bereich von -2 bis +6 mm, vorzugsweise im Bereich von -0,5 bis +2,5 mm, insbesondere im Bereich von -0,5 bis 0 mm oder im Bereich von 0 bis +2,5 mm, aufweisen.The document DE 10 2004 047 879 A1 discloses a headbox of a machine for producing a fibrous web from at least one pulp suspension, with a headbox having an upper nozzle wall and a lower nozzle wall and two side walls, tapering to an outlet and an interior space traversed by the pulp suspension. On the upper nozzle wall, a diaphragm which can be displaced by means of several elements and is arranged over the machine width is arranged on the outlet side. The diaphragm has a main surface which is touched by the at least one pulp suspension and runs parallel to the inner surface of the upper nozzle wall. Moreover, the diaphragm can have a diaphragm board in the range of -2 to +6 mm, preferably in the range of -0.5 to +2.5 mm, in particular in the range of -0.5 to 0 mm or in the range of 0 to +2 , 5 mm.

Eine der beiden Düsenlippen eines Stoffauflaufs ist üblicherweise in Strömungsrichtung glatt und über die an der gegenüberliegenden Düsenlippe vorgesehene Blende überstehend. Die glatte Form sorgt dafür, dass es zu keiner Strahlkontraktion und damit Suspensionsbeschleunigung kommt.One of the two nozzle lips of a headbox is usually smooth in the flow direction and projects beyond the aperture provided on the opposite nozzle lip. The smooth shape ensures that there is no beam contraction and thus suspension acceleration.

Im Gegensatz dazu wird auf der Blendenseite des Stoffauflaufs der Suspensionsstrahl kontrahiert und die Suspension entsprechend beschleunigt, wodurch sich hinsichtlich Geschwindigkeit und Turbulenz unterschiedliche Strömungszustände auf der Ober- und Unterseite des Suspensionsstrahls und schließlich auch im Papier ergeben. Hierdurch können verschieden starke Orientierungen in der z-Richtung der Faserstoffbahn erzeugt werden. Die Folge können Curl-Erscheinungen (Rollneigung) zum Beispiel im Kopierpapier oder andere Flachlagenprobleme (Cockling, Fluting) sein.In contrast, the suspension jet is contracted on the baffle side of the headbox and the suspension accelerated accordingly, resulting in different flow conditions on the top and bottom of the suspension jet and ultimately in the paper in terms of speed and turbulence. As a result, different degrees of orientation in the z-direction of the fibrous web can be generated. The result may be curls (curling), for example, in copy paper or other flatness problems (cockling, fluting).

Die entsprechenden Verhältnisse bei einem derartigen bekannten Stoffauflauf ergeben sich aus der Figur 1, in der auch die Strahlkonstraktion "K" des Suspensionsstrahls 16 dargestellt ist.The corresponding conditions in such a known headbox arise from the FIG. 1 , in which the beam traction "K" of the suspension jet 16 is also shown.

Danach liegt einer mit einer Blende versehenen ersten Düsenlippe 12 eine glatte zweite Düsenlippe 14 gegenüber. Die Blende 10 steht zur gegenüberliegenden zweiten Düsenlippe 14 hin vor, so dass auf der Blendenseite des Stoffauflaufs der Suspensions- oder Stoffstrahl 16 kontrahiert und die Suspension entsprechend beschleunigt wird.After that, a first nozzle lip 12 provided with a diaphragm faces a smooth second nozzle lip 14. The diaphragm 10 protrudes toward the opposite second nozzle lip 14 so that the suspension or material jet 16 contracts on the diaphragm side of the headbox and the suspension is correspondingly accelerated.

Der Erfindung liegt die Aufgabe zugrunde, einen verbesserten Stoffauflauf der eingangs genannten Art zu schaffen, bei dem der erzeugte Suspensionsstrahl im Hinblick auf Geschwindigkeit und Turbulenz in Dicken- oder z-Richtung eine größere Symmetrie besitzt, wodurch die Qualität des Endproduktes und insbesondere die Flachlage verbessert wird. Zudem soll in z-Richtung eine teilweise Steuerung der Profilierung möglich sein, falls ein symmetrisches Papier noch nicht optimal für den Einsatzfall ist.The invention has for its object to provide an improved headbox of the type mentioned, in which the suspension jet generated in terms of speed and turbulence in the thickness or z-direction has a greater symmetry, whereby the quality of the final product and in particular improves the flatness becomes. In addition, a partial control of the profiling should be possible in the z direction, if a symmetrical paper is not yet optimal for the application.

Bezüglich des Stoffauflaufs der eingangs genannten Art wird diese Aufgabe erfindungsgemäß dadurch gelöst, dass wobei die zweite Düsenlippe einen zur Mittenebene des Düsenkanals hin vorspringenden Versatz aufweist, wobei in Richtung des Suspensionsstrahles betrachtet der vor der Blende liegende Abschnitt des Versatzes kürzer ist als der hinter der Blende liegende Abschnitt des Versatzes.With respect to the headbox of the type mentioned above, this object is achieved in that the second nozzle lip has a projecting towards the center plane of the nozzle channel offset, wherein viewed in the direction of the suspension beam of the diaphragm located portion of the offset is shorter than that behind the diaphragm lying portion of the offset.

Durch den Versatz wird der Suspensionsstrahl auf der betreffenden Seite kontrahiert und beschleunigt, so dass er in Bezug auf Turbulenz und Geschwindigkeit zumindest eine ähnliche Charakteristik wie auf der Blendenseite erhält.As a result of the offset, the suspension jet is contracted and accelerated on the relevant side, so that it receives at least a similar characteristic with respect to turbulence and speed as on the diaphragm side.

Bevorzugt ist in der Ebene der Düsenaustrittsöffnung oder in einer dazu parallelen Ebene betrachtet der Abstand zwischen dem Versatz und der Mittelebene des Düsenkanals zumindest im Wesentlichen gleich groß wie der Abstand zwischen der Blende und der Mittelebene des Düsenkanals.Preferably, in the plane of the nozzle outlet opening or in a plane parallel thereto, the distance between the offset and the center plane of the nozzle channel is at least substantially the same size as the distance between the aperture and the median plane of the nozzle channel.

In der Ebene der Düsenaustrittsöffnung oder in einer dazu parallelen Ebene betrachtet kann also der Versatz gegenüber der Ebene der an den Düsenkanal angrenzenden Fläche der zweiten Düsenlippe vorteilhafterweise um einen Betrag vorstehen, der im Bereich des Betrages liegt, um den die Blende gegenüber der an den Düsenkanal angrenzenden Fläche der ersten Düsenlippe vorsteht.Thus, viewed in the plane of the nozzle exit opening or in a plane parallel thereto, the offset relative to the plane of the surface of the second nozzle lip adjoining the nozzle channel can advantageously protrude by an amount which is in the range of the amount by which the aperture is opposite that of the nozzle channel protruding surface of the first nozzle lip protrudes.

Dabei stehen der Versatz und die Blende, das heißt die Blendenkante vorteilhafterweise jeweils um einen Betrag im Bereich von etwa 0,2 bis etwa 0,6 mm, bevorzugt um einen Betrag im Bereich von etwa 0,5 bis 0,3 mm vor.In this case, the offset and the diaphragm, that is to say the diaphragm edge, are advantageously present in each case by an amount in the range of about 0.2 to about 0.6 mm, preferably by an amount in the range of about 0.5 to 0.3 mm.

Von Vorteil ist insbesondere auch, wenn der Übergang zwischen der an den Düsenkanal angrenzenden Fläche der zweiten Düsenlippe und dem Versatz gerundet ist. Indem die Geometrie des Versatzes bevorzugt als Kurve ohne scharfe Kanten ausgeführt ist, werden eine Strömungsablösung von der betreffenden Düsenwand und demzufolge Ablagerungen und Strahlstörungen vermieden.It is particularly advantageous if the transition between the adjacent to the nozzle channel surface of the second nozzle lip and the offset is rounded. By the geometry of the offset is preferably designed as a curve without sharp edges, a flow separation of the respective nozzle wall and consequently deposits and jet disturbances are avoided.

Der erfindungsgemäße Stoffauflauf ist mit Vorteil insbesondere als Einschichtstoffauflauf und für holzfreie Papiere einsetzbar.The headbox according to the invention is advantageously used in particular as a single-layer headbox and for wood-free papers.

Er ist mit besonderem Vorteil insbesondere bei GapFormern einsetzbar, bei denen die Blattstruktur durch die Geschwindigkeitsunterschiede der Stoffsuspension auf verschiedenen Radien um gebogene Elemente beeinflusst wird, um eine symmetrische oder beliebig gesteuerte Faserorientierungszweiseitigkeit zu erreichen.It can be used with particular advantage in particular with GapFormern, in which the sheet structure is influenced by the speed differences of the stock suspension at different radii to curved elements in order to achieve a symmetrical or arbitrarily controlled Faserorientierungszweiseitigkeit.

Demzufolge kann insbesondere ein Papier erzeugt werden, welches nach dem Kopieren nur noch eine sehr geringe Rollneigung besitzt.Consequently, it is possible in particular to produce a paper which only has a very low tendency to curl after copying.

Der erzeugte Suspensionsstrahl kann bezüglich der Geschwindigkeit und Turbulenz in der Dicke oder in z-Richtung symmetrischer gemacht werden, wodurch die Papierqualität entsprechend verbessert und insbesondere eine Flachlage erzeugt werden kann. Sofern ein symmetrisches Papier noch nicht optimal für den Einsatzfall sein sollte, kann aufgrund der erfindungsgemäßen Lösung die Profilierung in z-Richtung teilweise gesteuert werden.The generated suspension jet can be made more symmetrical in terms of speed and turbulence in the thickness or in the z-direction, whereby the paper quality can be improved accordingly and in particular a flat layer can be produced. If a symmetrical paper should not be optimal for the application, the profiling in the z-direction can be partially controlled due to the inventive solution.

Die Erfindung wird im Folgenden anhand von Ausführungsbeispielen unter Bezugnahme auf die Zeichnung näher erläutert; in dieser zeigen:

Figur 1
eine schematische Teildarstellung eines herkömmlichen Stoffauflaufs; und
Figur 2
eine schematische Teildarstellung einer beispielhaften Ausführungsform eines erfindungsgemäßen Stoffauflaufs.
The invention will be explained in more detail below with reference to exemplary embodiments with reference to the drawing; in this show:
FIG. 1
a schematic partial view of a conventional headbox; and
FIG. 2
a schematic partial view of an exemplary embodiment of a head box according to the invention.

Figur 2 zeigt in schematischer Teildarstellung eine beispielhafte Ausführungsform eines erfindungsgemäßen Stoffauflaufs 18 für eine Maschine zur Herstellung einer Faserstoffbahn, insbesondere Papier- oder Kartonbahn. FIG. 2 shows a schematic partial representation of an exemplary embodiment of a headbox 18 according to the invention for a machine for producing a fibrous web, in particular paper or board web.

Der Stoffauflauf 18 umfasst eine Düse 20 zur Erzeugung eines Suspensionsstrahles, die eine mit einer Blende 22 versehene erste Lippe 24 und eine dieser gegenüberliegende zweite Lippe 26 aufweist. Zwischen den beiden Düsenlippen 24, 26 ist ein Düsenkanal 28 definiert. Die Blende 22 ist im Bereich der Düsenaustrittsöffnung 30 vorgesehen.The headbox 18 comprises a nozzle 20 for generating a suspension jet, which has a first lip 24 provided with a diaphragm 22 and a second lip 26 opposite thereto. Between the two Nozzle lips 24, 26, a nozzle channel 28 is defined. The aperture 22 is provided in the region of the nozzle outlet opening 30.

Wie anhand der Figur 2 zu erkennen ist, weist die zweite Düsenlippe 26 eine zur Mittenebene 32 des Düsenkanals 28 hin vorspringenden Versatz 34 auf.As based on the FIG. 2 1, the second nozzle lip 26 has an offset 34 projecting towards the middle plane 32 of the nozzle channel 28.

In der Ebene der Düsenaustrittsöffnung 30 oder in einer dazu parallelen Ebene betrachtet ist der Abstand zwischen dem Versatz 34 und der Mittenebene 32 des Düsenkanals 28 zumindest im Wesentlichen vorzugsweise gleich groß wie der Abstand zwischen der Blende 22 und der Mittenebene 32 des Düsenkanals 28.Viewed in the plane of the nozzle outlet opening 30 or in a plane parallel thereto, the distance between the offset 34 and the center plane 32 of the nozzle channel 28 is at least substantially equal to the distance between the aperture 22 and the central plane 32 of the nozzle channel 28 at least substantially.

In der Ebene der Düsenaustrittsöffnung 30 oder in einer dazu parallelen Ebene betrachtet kann der Versatz 34 also gegenüber der Ebene 36' der an dem Düsenkanal 38 angrenzenden Fläche 36 der zweiten Düsenlippe 26 um einen Betrag 38 vorstehen, der im Bereich des Betrages 40 liegt, um den die Blende 22 gegenüber der an den Düsenkanal 28 angrenzenden Fläche 42 der ersten Düsenlippe 24 vorsteht.When viewed in the plane of the nozzle outlet opening 30 or in a plane parallel thereto, the offset 34 can thus protrude with respect to the plane 36 'of the surface 36 of the second nozzle lip 26 adjoining the nozzle channel 38 by an amount 38 which lies in the region of the amount 40 in that the diaphragm 22 protrudes from the surface 42 of the first nozzle lip 24 adjoining the nozzle channel 28.

Der Versatz 34 beginnt in Richtung des Suspensionsstrahles 44 betrachtet vor der Blende 22. Dabei erstreckt sich der Versatz 34 in Richtung des Suspensionsstrahles 44 betrachtet über das mit der Blende 22 versehene Ende der ersten Düsenlippe 24 hinaus.The offset 34 begins in the direction of the suspension jet 44 viewed in front of the diaphragm 22. In this case, the offset 34 extends in the direction of the suspension jet 44 viewed beyond the aperture 22 provided with the end of the first nozzle lip 24 also.

Der in Richtung des Suspensionsstrahles 44 betrachtet vor der Blende 22 liegende Abschnitt des Versatzes 34 ist kürzer als der dahinterliegende Abschnitt.The viewed in the direction of the suspension beam 44 in front of the diaphragm 22 portion of the offset 34 is shorter than the underlying section.

Der Übergang zwischen der an dem Düsenkanal 28 angrenzenden Fläche 36 der zweiten Düsenlippe 26 und dem Versatz 34 ist vorteilhafterweise gerundet, wie dies in der Figur 2 durch einen mit "R" bezeichneten Pfeil angedeutet ist. Auch der Übergang zwischen der Flanke 46 und dem sich daran anschließenden zur Mittenebene 32 parallelen Abschnitt des Versatzes 34 ist wieder gerundet. Auch diese Rundung ist wieder durch einen mit "R" bezeichneten Pfeil angedeutet.The transition between the surface 36 of the second nozzle lip 26 adjoining the nozzle channel 28 and the offset 34 is advantageously rounded, as shown in FIG FIG. 2 is indicated by an arrow labeled "R". Also the Transition between the edge 46 and the adjoining to the mid-plane 32 parallel portion of the offset 34 is rounded again. This rounding is again indicated by an arrow marked "R".

Wie anhand der Figur 2 zu erkennen ist, beginnt der Versatz 34 in einem Abstand I' vor der Blende 22.As based on the FIG. 2 can be seen, the offset 34 begins at a distance I 'in front of the aperture 22nd

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
Blendecover
1212
Erste DüsenlippeFirst nozzle lip
1414
Zweite DüsenlippeSecond nozzle lip
1616
Suspensionsstrahlsuspension jet
1818
Stoffauflaufheadbox
2020
Düsejet
2222
Blendecover
2424
Erste DüsenlippeFirst nozzle lip
2626
Zweite DüsenlippeSecond nozzle lip
2828
Düsenkanalnozzle channel
3030
DüsenaustrittsöffnungNozzle outlet opening
3232
Mittenebenemidplane
3434
Versatzoffset
3636
Flächearea
36'36 '
Ebenelevel
3838
Betragamount
4040
Betragamount
4242
Flächearea
4444
Suspensionsstrahlsuspension jet
4646
Flankeflank
KK
Strahlkontraktionbeam contraction
l'l '
Abstanddistance

Claims (6)

  1. Headbox (18) for a machine for producing a fibrous web, in particular a paper or board web, having a nozzle (20) for producing a suspension jet, which comprises a first lip (24) provided with a baffle (22) and a second lip (26) opposite the first, a nozzle channel (28) being defined between the two nozzle lips (24, 26) and the baffle (22) being provided in the region of the nozzle outlet opening (30), the second nozzle lip (26) having an offset (34) projecting towards the mid-plane (32) of the nozzle channel (28), the offset (34), as viewed in the direction of the suspension jet (44), beginning in front of the baffle (22), and the offset (34), as viewed in the direction of the suspension jet (44), extending beyond that end of the first nozzle lip (24) which is provided with the baffle (22),
    characterized in that,
    as viewed in the direction of the suspension jet (44), that section of the offset (34) which lies in front of the baffle (22) is shorter than that section of the offset (34) which lies behind the baffle (22).
  2. Headbox (18) according to Claim 1,
    characterized in that
    as viewed in the plane of the nozzle outlet opening (30) or a plane parallel thereto, the distance between the offset (34) and the mid-plane (32) of the nozzle channel (28) is at least substantially as large as the distance between the baffle (22) and the mid-plane (32) of the nozzle channel (28).
  3. Headbox (18) according to Claim 1 or 2,
    characterized in that
    as viewed in the plane of the nozzle outlet opening (30) or a plane parallel thereto, the offset (34) projects with respect to the plane (36') of the surface (36) of the second nozzle lip (26) that adjoins the nozzle channel (28) by an amount (38) which lies within the range of the amount (40) by which the baffle (22) projects with respect to the surface (42) of the first nozzle lip (24) that adjoins the nozzle channel (28).
  4. Headbox (18) according to Claim 3,
    characterized in that
    the offset (34) and the baffle (22) in each case project by an amount in the range from about 0.2 to about 0.6 mm.
  5. Headbox (18) according to Claim 4,
    characterized in that
    the offset (34) and the baffle (22) in each case project by an amount in the range from about 0.5 to about 0.3 mm.
  6. Headbox (18) according to one of the preceding claims,
    characterized in that
    the transition between that surface (36) of the second nozzle lip (26) which adjoins the nozzle channel (28) and the offset (34) is rounded.
EP07118009A 2006-10-13 2007-10-08 Headbox Not-in-force EP1911878B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL07118009T PL1911878T3 (en) 2006-10-13 2007-10-08 Headbox

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006049020A DE102006049020A1 (en) 2006-10-13 2006-10-13 headbox

Publications (3)

Publication Number Publication Date
EP1911878A2 EP1911878A2 (en) 2008-04-16
EP1911878A3 EP1911878A3 (en) 2008-07-23
EP1911878B1 true EP1911878B1 (en) 2010-03-31

Family

ID=38961120

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07118009A Not-in-force EP1911878B1 (en) 2006-10-13 2007-10-08 Headbox

Country Status (4)

Country Link
EP (1) EP1911878B1 (en)
AT (1) ATE462830T1 (en)
DE (2) DE102006049020A1 (en)
PL (1) PL1911878T3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102691225A (en) * 2012-05-28 2012-09-26 华南理工大学 Flow box device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT376721B (en) * 1980-11-26 1984-12-27 Escher Wyss Gmbh FABRIC DRIVE FOR A PAPER MACHINE
DE4005147A1 (en) * 1990-02-17 1991-08-29 Voith Gmbh J M Paper making stock inlet jet - delivers fibre suspension in a stream which opens out without micro-turbulence
DE4323050C1 (en) * 1993-07-12 1995-02-16 Voith Gmbh J M Nozzle for a multilayer head box and process for the low-mixing bringing together of at least two stock suspension flows
DE102004009317A1 (en) * 2004-02-26 2005-09-08 Voith Paper Patent Gmbh Sheet forming system
DE102004047879A1 (en) * 2004-10-01 2006-04-06 Voith Paper Patent Gmbh Multi-layer regulator for production of a fibrous material course, comprises a fibrous material suspension with a nozzle wall and side panels, separating element, lamellas, and an aperture exhibits a affected main face of the suspension

Also Published As

Publication number Publication date
DE502007003287D1 (en) 2010-05-12
EP1911878A3 (en) 2008-07-23
DE102006049020A1 (en) 2008-04-17
EP1911878A2 (en) 2008-04-16
PL1911878T3 (en) 2010-08-31
ATE462830T1 (en) 2010-04-15

Similar Documents

Publication Publication Date Title
EP0711869B1 (en) Multi-layer headbox
EP2352879A2 (en) Dual-layer material ramp for a machine for producing a dual-layered fibrous web
EP2739780B1 (en) Sheet forming system for a machine for producing a two-layer or multi-layer web
EP2446083B1 (en) Headbox for a machine for producing a fiber web
EP1911878B1 (en) Headbox
DE4323050C1 (en) Nozzle for a multilayer head box and process for the low-mixing bringing together of at least two stock suspension flows
DE102010030707A1 (en) Sheet forming system for a machine for producing an at least single-layer fibrous web
DE102007033395A1 (en) Schrägsiebformer a machine for producing a fibrous web of at least one pulp suspension
DE4497054C2 (en) Twin wire former of a paper machine
EP1881106B1 (en) Headbox of a machine for producing a sheet of fibrous material
EP1403424B1 (en) Headbox with guide vane
EP2085511B1 (en) Multiple layer flowbox for a machine for producing a multiple layer sheet of fibrous material
DE102010041332A1 (en) Sheet formation system for machine for production of e.g. paper, has head box positionable for varying beam incidence angle and/or beam incidence line under maintenance of unchanged geometry of head box nozzle
EP1342834A2 (en) Process and headbox for a machine for making a fibrous web
DE102018004995A1 (en) Security paper web with watermark and drainage screen for the production of watermark paper
EP2205792B1 (en) Twin-wire former
DE202014001501U1 (en) sealing strip
DE102005010628A1 (en) Jet outlet for papermaking headbox has series of roughly horizontal lamella guiding fiber discharge
EP2025809A2 (en) Method for influencing the two sidedness of layer orientation and headbox for carrying out the method
EP1452640A2 (en) Headbox
DE102008000564A1 (en) Device for producing and / or treating a fibrous web
EP1403423A1 (en) Head box with swirl inducer
DE202005021804U1 (en) Sheet forming system
DE19919720A1 (en) Fiber web formation zone has flexible blades at the stock inlet jet to guide the fiber suspension flow without turbulence between the fourdriniers at the support units which apply different pressures in zones
DE19852635A1 (en) Entry into the fourdrinier section of a papermaking/cardboard production machine has fourdrinier support surfaces at the converging entry for a pulp flow from the stock inlet without turbulence

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): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK RS

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 BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK RS

17P Request for examination filed

Effective date: 20090123

17Q First examination report despatched

Effective date: 20090302

AKX Designation fees paid

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

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): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REF Corresponds to:

Ref document number: 502007003287

Country of ref document: DE

Date of ref document: 20100512

Kind code of ref document: P

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

REG Reference to a national code

Ref country code: NL

Ref legal event code: VDEP

Effective date: 20100331

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

Ref country code: LT

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: 20100331

LTIE Lt: invalidation of european patent or patent extension

Effective date: 20100331

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

Ref country code: SI

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: 20100331

Ref country code: LV

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: 20100331

REG Reference to a national code

Ref country code: PL

Ref legal event code: T3

REG Reference to a national code

Ref country code: IE

Ref legal event code: FD4D

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

Ref country code: RO

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: 20100331

Ref country code: CY

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: 20100331

Ref country code: EE

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: 20100331

Ref country code: ES

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: 20100712

Ref country code: NL

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: 20100331

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

Ref country code: SK

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: 20100331

Ref country code: CZ

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: 20100331

Ref country code: IS

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: 20100731

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

Ref country code: PT

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: 20100802

Ref country code: IE

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: 20100331

Ref country code: DK

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: 20100331

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: 20110104

BERE Be: lapsed

Owner name: VOITH PATENT G.M.B.H.

Effective date: 20101031

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

Ref country code: MC

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

Effective date: 20101031

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

Ref country code: BE

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

Effective date: 20101031

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: 20101008

Ref country code: MT

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: 20100331

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

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

Effective date: 20111008

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: 20111031

Ref country code: CH

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

Effective date: 20111031

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: 20111008

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

Ref country code: LU

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

Effective date: 20101008

Ref country code: HU

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: 20101001

Ref country code: BG

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: 20100331

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

Ref country code: TR

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: 20100331

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

Ref country code: PL

Payment date: 20120925

Year of fee payment: 6

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

Ref country code: DE

Payment date: 20121023

Year of fee payment: 6

Ref country code: FR

Payment date: 20121031

Year of fee payment: 6

Ref country code: FI

Payment date: 20121011

Year of fee payment: 6

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

Ref country code: SE

Payment date: 20121019

Year of fee payment: 6

Ref country code: IT

Payment date: 20121023

Year of fee payment: 6

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

Ref country code: AT

Payment date: 20121011

Year of fee payment: 6

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

Ref country code: BG

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: 20100630

REG Reference to a national code

Ref country code: SE

Ref legal event code: EUG

REG Reference to a national code

Ref country code: AT

Ref legal event code: MM01

Ref document number: 462830

Country of ref document: AT

Kind code of ref document: T

Effective date: 20131008

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 502007003287

Country of ref document: DE

Effective date: 20140501

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20140630

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: 20131008

Ref country code: IT

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

Effective date: 20131008

Ref country code: SE

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

Effective date: 20131009

Ref country code: GR

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: 20100331

Ref country code: DE

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

Effective date: 20140501

Ref country code: AT

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

Effective date: 20131008

Ref country code: FR

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

Effective date: 20131031

REG Reference to a national code

Ref country code: PL

Ref legal event code: LAPE

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

Ref country code: PL

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

Effective date: 20131008