EP1348803A2 - Multi-layer headbox - Google Patents
Multi-layer headbox Download PDFInfo
- Publication number
- EP1348803A2 EP1348803A2 EP03100381A EP03100381A EP1348803A2 EP 1348803 A2 EP1348803 A2 EP 1348803A2 EP 03100381 A EP03100381 A EP 03100381A EP 03100381 A EP03100381 A EP 03100381A EP 1348803 A2 EP1348803 A2 EP 1348803A2
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- EP
- European Patent Office
- Prior art keywords
- nozzle
- flow
- layer
- assigned
- layer headbox
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- 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.)
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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
- D21F1/026—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
- D21F1/02—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 multi-layer headbox for a paper machine, with several nozzle spaces, each assigned to one of the different layers are and in each of which a partial suspension flow assigned to the relevant layer up to an outlet gap provided at the end of the nozzle space is led.
- a multi-layer headbox is, for example, from EP 0 581 051 B1 known.
- Multi-layer headboxes have so far been used with approximately the same nozzle lengths Layer built. There are clear differences in length that result from the design less than 1% of the specified nozzle length.
- the aim of the invention is to provide an improved multi-layer headbox to create the kind mentioned.
- the maximum nozzle space length is preferably about 800 mm. It follows namely a significant improvement in jet stability with increasing nozzle length up to approx. 800 mm.
- the minimum nozzle space length is expediently less than or equal to 400 mm, in particular less than or equal to 350 mm and preferably approximately equal to 300 mm. Short nozzles generate higher turbulence than long nozzles. With short Nozzles can have a significantly lower tear length ratio and thus a higher one Cross strength can be achieved.
- a preferred expedient embodiment of the multilayer headbox according to the invention is characterized by the fact that it is for at least three Layers is designed and that the assigned to the two outer layers Nozzle spaces have a greater length than at least one of a medium size Layer assigned nozzle area.
- the two outer layers assigned nozzle spaces in particular have the same length.
- Such a headbox designed for at least three layers can advantageously can be used especially in connection with a gap former.
- the length difference between differently long nozzle spaces can advantageously viewed in the direction of flow between each shorter nozzle space and the relevant cross-flow distributor arranged Intermediate chamber can be bridged.
- the intermediate chamber can flow considered in particular between two turbulence generator sections be arranged.
- the headbox is a two-layer headbox executed, the assigned to the two layers Nozzle spaces a different length measured in the direction of flow have.
- the longer nozzle space of a ceiling layer is preferred and the shorter nozzle space is assigned to a back layer.
- the back will with a short nozzle and the ceiling with a long nozzle.
- the back is in this case with a low L / Q ratio and the ceiling with an optimal one Beam driven for good coverage and formation.
- the cross flow distributors assigned to the two different layers can according to the difference in length between the two long nozzle spaces in the direction of flow against each other.
- the length difference can also be caused, for example, by one in the direction of flow considered between the shorter nozzle space and the one in question
- Cross-flow distributor arranged intermediate chamber are bridged.
- a such an intermediate chamber can in particular be viewed again in the direction of flow be arranged between two turbulence generator sections.
- FIG. 1 shows a three-layer headbox 10 in a schematic sectional illustration with two longer nozzle spaces 12, 14 assigned to the two outer layers and a much shorter nozzle space 16 for the middle one Layer.
- the middle nozzle space 16 about 1/3 shorter than the two outer nozzle spaces 12, 14.
- the relevant partial suspension flows are in the nozzle spaces 12-16 in each case up to an outlet gap 18-22 provided at the end of the nozzle space guided.
- a turbulence generator 30-34 can be provided in each case for cross-flow distributors.
- the difference in length between the different lengths Nozzle spaces 12 - 16 bridged by an intermediate chamber 36, which is in the direction of flow S considered between that determined for the middle layer Cross flow distributor 28 and the associated nozzle space 16 is arranged.
- the maximum nozzle space length can be approximately 800 mm, for example.
- the Minimum nozzle space length is, for example, less than or equal to 400 mm, in particular less than or equal to 350 mm and preferably approximately equal to 300 mm.
- the intermediate chamber 36 is between two turbulence generator sections in the present case 34 ', 34 "arranged.
- Such a multi-layer headbox 10 can be used in particular in conjunction with a gap former can be used.
- Figure 2 shows a schematic sectional view of a comparable to that of Figure 1
- Three-layer headbox 10 with two of the two outer layers assigned longer nozzle spaces 12, 14 and one in comparison clearly shorter nozzle space 16 for the middle layer.
- This three-layer headbox 10 differs from that of FIG. 1 only in that here the intermediate chamber is missing and instead the different layers assigned cross-flow distributor 24-28 according to the length difference between the shorter middle nozzle chamber 16 on the one hand and the two longer ones
- nozzle spaces 12, 14 are offset from one another in the flow direction S. are.
- the middle cross-flow distributor is therefore opposite the two outer cross-flow distributors 24, 26 to the left, i.e. to the exit columns 18 - 22 offset. Is between the cross flow distributor 28 and the nozzle chamber 16 in the present case, therefore, only a single turbulence generator 34 is provided.
- this three-layer headbox 10 has at least essentially again the same structure as that of Figure 1. Corresponding parts are assigned the same reference numerals.
- e.g. also be a two-layer headbox.
- Figure 3 shows a schematic sectional view of such a two-layer headbox 38, in which the nozzle spaces 40, 42 have a different length measured in the flow direction S.
- the Back is with the shorter nozzle space 40 and the nozzle Cover produced with the nozzle having the longer nozzle space 42.
- the back in the present case is therefore with a relatively low L / Q ratio produced while the ceiling with an optimal beam for good Cover and formation is driven.
Abstract
Description
Die Erfindung betrifft einen Mehrschicht-Stoffauflauf für eine Papiermaschine, mit mehreren Düsenräumen, die jeweils einer der verschiedenen Schichten zugeordneten sind und in denen jeweils ein der betreffenden Schicht zugeordneter Teilsuspensionsstrom bis zu einem am Düsenraumende vorgesehenen Austrittsspalt geführt ist. Ein solcher Mehrschicht-Stoffauflauf ist beispielsweise aus der EP 0 581 051 B1 bekannt.The invention relates to a multi-layer headbox for a paper machine, with several nozzle spaces, each assigned to one of the different layers are and in each of which a partial suspension flow assigned to the relevant layer up to an outlet gap provided at the end of the nozzle space is led. Such a multi-layer headbox is, for example, from EP 0 581 051 B1 known.
Mehrschicht-Stoffaufläufe werden bisher mit annähernd gleichen Düsenlängen pro Schicht gebaut. Längenunterschiede, die sich konstruktiv ergeben, liegen deutlich unter 1 % der angegebenen Düsenlänge.Multi-layer headboxes have so far been used with approximately the same nozzle lengths Layer built. There are clear differences in length that result from the design less than 1% of the specified nozzle length.
Ziel der Erfindung ist es, einen verbesserten Mehrschicht-Stoffauflauf der eingangs genannten Art zu schaffen.The aim of the invention is to provide an improved multi-layer headbox to create the kind mentioned.
Diese Aufgabe wird nach der Erfindung dadurch gelöst, dass die Düsenräume zumindest teilweise eine unterschiedliche in Strömungsrichtung gemessene Länge besitzen.This object is achieved according to the invention in that the nozzle spaces at least partially a different length measured in the direction of flow have.
Aufgrund dieser Ausbildung werden in dem Mehrschicht-Stoffauflauf die technologischen Vorteile der langen Düsen mit denen der kurzen Düsen miteinander kombiniert. Es versteht sich, dass die betreffenden Längenunterschiede der Düsenräume über die eingangs erwähnten, sich konstruktiv ergebenden Längenunterschiede hinausgehen. Because of this training, the technological in the multi-layer headbox Advantages of the long nozzles with those of the short nozzles with each other combined. It is understood that the length differences in question Nozzle spaces over the length differences mentioned above, which result from the design go out.
Die maximale Düsenraumlänge beträgt vorzugsweise etwa 800 mm. Es ergibt sich nämlich eine deutliche Verbesserung der Strahlstabilität mit steigender Düsenlänge bis ca. 800 mm.The maximum nozzle space length is preferably about 800 mm. It follows namely a significant improvement in jet stability with increasing nozzle length up to approx. 800 mm.
Die minimale Düsenraumlänge ist zweckmäßigerweise kleiner oder gleich 400 mm, insbesondere kleiner oder gleich 350 mm und vorzugsweise etwa gleich 300 mm. Kurze Düsen generieren höhere Turbulenzen als lange Düsen. Mit kurzen Düsen kann ein deutlich niedrigeres Reißlängenverhältnis und damit eine höhere Querfestigkeit erzielt werden.The minimum nozzle space length is expediently less than or equal to 400 mm, in particular less than or equal to 350 mm and preferably approximately equal to 300 mm. Short nozzles generate higher turbulence than long nozzles. With short Nozzles can have a significantly lower tear length ratio and thus a higher one Cross strength can be achieved.
Eine bevorzugte zweckmäßige Ausführungsform des erfindungsgemäßen Mehrschicht-Stoffauflaufs zeichnet sich dadurch aus, dass er für zumindest drei Schichten auslegt ist und dass die den beiden Außenschichten zugeordneten Düsenräume eine größere Länge besitzen als zumindest ein einer mittleren Schicht zugeordneter Düsenraum. Dabei können die den beiden Außenschichten zugeordneten Düsenräume insbesondere eine gleiche Länge besitzen.A preferred expedient embodiment of the multilayer headbox according to the invention is characterized by the fact that it is for at least three Layers is designed and that the assigned to the two outer layers Nozzle spaces have a greater length than at least one of a medium size Layer assigned nozzle area. The two outer layers assigned nozzle spaces in particular have the same length.
Ein solcher für zumindest drei Schichten ausgelegter Stoffauflauf kann vorteilhafterweise insbesondere in Verbindung mit einem Gapformer eingesetzt werden.Such a headbox designed for at least three layers can advantageously can be used especially in connection with a gap former.
Die Längendifferenz zwischen unterschiedlich langen Düsenräumen kann vorteilhafterweise durch eine in Strömungsrichtung betrachtet zwischen dem jeweils kürzeren Düsenraum und dem betreffenden Querstromverteiler angeordnete Zwischenkammer überbrückt werden. Die Zwischenkammer kann in Strömungsrichtung betrachtet insbesondere zwischen zwei Turbulenzerzeugerabschnitten angeordnet sein.The length difference between differently long nozzle spaces can advantageously viewed in the direction of flow between each shorter nozzle space and the relevant cross-flow distributor arranged Intermediate chamber can be bridged. The intermediate chamber can flow considered in particular between two turbulence generator sections be arranged.
Grundsätzlich ist jedoch auch eine solche Ausführungsform denkbar, bei der die den verschiedenen Schichten zugeordneten Querstromverteiler entsprechend einer jeweiligen Längendifferenz zwischen unterschiedlich langen Düsenräumen in Strömungsrichtung gegeneinander versetzt sind.In principle, however, such an embodiment is also conceivable in which the the cross-flow distributors assigned to the various layers a respective length difference between differently long nozzle spaces in Flow direction are offset from each other.
So ist beispielsweise ein Dreischicht-Stoffauflauf an einem Gapformer oder dergleichen denkbar, der beispielsweise mit zwei langen Düsen für die Außenschichten und einer kurzen Düse für die Mittelschicht versehen ist. Die turbulenter erzeugte Mittelschicht hält das Gesamt-L/Q-Verhältnis niedrig und sorgt für eine hohe Querfestigkeit. Infolge der Erzeugung der Außenschichten mit langen Düsen werden eine gute Abdeckung sowie eine optimale Formation erreicht.For example, there is a three-layer headbox on a gap former or the like conceivable, for example, with two long nozzles for the outer layers and a short nozzle for the middle layer. The more turbulent generated middle class keeps the overall L / Q ratio low and ensures a high transverse strength. As a result of the creation of the outer layers with long nozzles good coverage and optimal formation are achieved.
Gemäß einer weiteren vorteilhaften Ausführungsform ist der Stoffauflauf als Zweischicht-Stoffauflauf ausgeführt, wobei die den beiden Schichten zugeordneten Düsenräume eine unterschiedliche in Strömungsrichtung gemessene Länge besitzen. Dabei sind vorzugsweise der längere Düsenraum einer Deckenschicht und der kürzere Düsenraum einer Rückenschicht zugeordnet. Der Rücken wird also mit kurzer und die Decke mit langer Düse produziert. Der Rücken wird in diesem Fall mit niedrigem L/Q-Verhältnis und die Decke mit einem optimalen Strahl für eine gute Abdeckung und Formation gefahren.According to a further advantageous embodiment, the headbox is a two-layer headbox executed, the assigned to the two layers Nozzle spaces a different length measured in the direction of flow have. The longer nozzle space of a ceiling layer is preferred and the shorter nozzle space is assigned to a back layer. The back will with a short nozzle and the ceiling with a long nozzle. The back is in this case with a low L / Q ratio and the ceiling with an optimal one Beam driven for good coverage and formation.
Die den beiden verschiedenen Schichten zugeordneten Querstromverteiler können entsprechend der Längendifferenz zwischen den beiden unterschiedlich langen Düsenräumen in Strömungsrichtung gegeneinander versetzt sein. Die Längendifferenz kann jedoch beispielsweise auch wieder durch eine in Strömungsrichtung betrachtet zwischen dem kürzeren Düsenraum und dem betreffenden Querstromverteiler angeordnete Zwischenkammer überbrückt werden. Eine solche Zwischenkammer kann insbesondere wieder in Strömungsrichtung betrachtet zwischen zwei Turbulenzerzeugerabschnitten angeordnet sein.The cross flow distributors assigned to the two different layers can according to the difference in length between the two long nozzle spaces in the direction of flow against each other. The However, the length difference can also be caused, for example, by one in the direction of flow considered between the shorter nozzle space and the one in question Cross-flow distributor arranged intermediate chamber are bridged. A such an intermediate chamber can in particular be viewed again in the direction of flow be arranged between two turbulence generator sections.
Die Erfindung wird im folgenden anhand von Ausführungsbeispielen unter Bezugnahme auf die Zeichnung näher erläutert; in dieser zeigen:
- Figur 1
- eine schematische Schnittdarstellung eines Dreischicht-Stoffauflaufs mit zwei den beiden Außenschichten zugeordneten längeren Düsenräumen und einem im Vergleich dazu kürzeren Düsenraum für die mittlere Schicht, wobei die Längendifferenz zwischen den unterschiedlich langen Düsenräumen durch eine Zwischenkammer überbrückt ist,
- Figur 2
- eine schematische Schnittdarstellung eines vergleichbaren Dreischicht-Stoffauflaufs ohne Zwischenraum und
- Figur 3
- eine schematische Schnittdarstellung eines ZweischichtStoffauflaufs, dessen den beiden Schichten zugeordnete Düsenräume eine unterschiedliche Länge besitzen.
- Figure 1
- 2 shows a schematic sectional illustration of a three-layer headbox with two longer nozzle spaces assigned to the two outer layers and a shorter nozzle space for the middle layer, the length difference between the differently long nozzle spaces being bridged by an intermediate chamber,
- Figure 2
- is a schematic sectional view of a comparable three-layer headbox without space and
- Figure 3
- is a schematic sectional view of a two-layer headbox, the nozzle spaces assigned to the two layers have a different length.
Figur 1 zeigt in schematischer Schnittdarstellung einen Dreischicht-Stoffauflauf 10
mit zwei den beiden Außenschichten zugeordneten längeren Düsenräumen 12, 14
und einem im Vergleich dazu deutlich kürzeren Düsenraum 16 für die mittlere
Schicht. Wie anhand der Figur 1 zu erkennen ist, ist im vorliegenden Fall der
mittlere Düsenraum 16 etwa um 1/3 kürzer als die beiden äußeren Düsenräume
12, 14.FIG. 1 shows a three-
In den Düsenräumen 12 - 16 werden die betreffenden Teilsuspensionsströme jeweils bis zu einem am Düsenraumende vorgesehenen Austrittsspalt 18 - 22 geführt.The relevant partial suspension flows are in the nozzle spaces 12-16 in each case up to an outlet gap 18-22 provided at the end of the nozzle space guided.
Zwischen den Düsenräumen 12 - 16 und den der jeweiligen Schicht zugeordneten Querstromverteilern kann jeweils ein Turbulenzerzeuger 30 - 34 vorgesehen sein. Between the nozzle spaces 12-16 and those assigned to the respective layer A turbulence generator 30-34 can be provided in each case for cross-flow distributors.
Im vorliegenden Fall ist die Längendifferenz zwischen den unterschiedlich langen
Düsenräumen 12 - 16 durch eine Zwischenkammer 36 überbrückt, die in Strömungsrichtung
S betrachtet zwischen dem für die mittlere Schicht bestimmten
Querstromverteiler 28 und dem zugeordneten Düsenraum 16 angeordnet ist.In the present case, the difference in length between the different lengths
Nozzle spaces 12 - 16 bridged by an
Die maximale Düsenraumlänge kann beispielsweise etwa 800 mm betragen. Die minimale Düsenraumlänge ist beispielsweise kleiner oder gleich 400 mm, insbesondere kleiner oder gleich 350 mm und vorzugsweise etwa gleich 300 mm.The maximum nozzle space length can be approximately 800 mm, for example. The Minimum nozzle space length is, for example, less than or equal to 400 mm, in particular less than or equal to 350 mm and preferably approximately equal to 300 mm.
Die Zwischenkammer 36 ist im vorliegenden Fall zwischen zwei Turbulenzerzeugerabschnitten
34', 34" angeordnet.The
Ein solcher Mehrschicht-Stoffauflauf 10 kann insbesondere in Verbindung mit
einem Gapformer eingesetzt werden.Such a
Figur 2 zeigt in schematischer Schnittdarstellung einen mit dem der Figur 1 vergleichbaren
Dreischicht-Stoffauflauf 10 mit zwei den beiden Außenschichten
zugeordneten längeren Düsenräumen 12, 14 und einem im Vergleich dazu deutlich
kürzeren Düsenraum 16 für die mittlere Schicht. Dieser Dreischicht-Stoffauflauf
10 unterscheidet sich von dem der Figur 1 lediglich dadurch, dass hier
die Zwischenkammer fehlt und stattdessen die den verschiedenen Schichten
zugeordneten Querstromverteiler 24- 28 entsprechend der Längedifferenz zwischen
dem kürzeren mittleren Düsenraum 16 einerseits und den beiden längeren
Düsenräumen 12, 14 andererseits in Strömungsrichtung S gegeneinander versetzt
sind. In der Figur 2 ist der mittlere Querstromverteiler also gegenüber den beiden
äußeren Querstromverteilern 24, 26 nach links, d.h. zu den Austrittsspalten 18 -
22 hin versetzt. Zwischen dem Querstromverteiler 28 und dem Düsenraum 16 ist
im vorliegenden Fall also nur ein einziger Turbulenzerzeuger 34 vorgesehen. Figure 2 shows a schematic sectional view of a comparable to that of Figure 1
Three-
Im übrigen besitzt dieser Dreischicht-Stoffauflauf 10 zumindest im wesentlichen
wieder den gleichen Aufbau wie der der Figur 1. Einander entsprechenden Teilen
sind gleiche Bezugszeichen zugeordnet.Otherwise, this three-
Bei den zuvor beschriebenen Dreischicht-Stoffaufläufen hält die turbulenter erzeugte Mittelschicht das Gesamt-L/Q-Verhältnis niedrig und sorgt für eine hohe Querfestigkeit. Mit der Erzeugung der Außenschichten durch lange Düsen werden eine gute Abdeckung und eine optimale Formation erzielt.In the three-layer headboxes described above, the more turbulent one produced Middle class the overall L / Q ratio low and ensures a high Transverse strength. With the creation of the outer layers through long nozzles good coverage and optimal formation.
Ähnlich kann z.B. auch ein Zweischicht-Stoffauflauf ausgeführt sein.Similarly, e.g. also be a two-layer headbox.
Figur 3 zeigt in schematischer Schnittdarstellung einen solchen Zweischicht-Stoffauflauf
38, bei dem die den beiden Schichten zugeordneten Düsenräume 40,
42 eine unterschiedliche in Strömungsrichtung S gemessene Länge besitzen. Der
Rücken wird mit der den kürzeren Düsenraum 40 aufweisenden Düse und die
Decke mit der den längeren Düsenraum 42 aufweisenden Düse produziert.Figure 3 shows a schematic sectional view of such a two-
Der Rücken wird im vorliegenden Fall also mit einem relativ niedrigem L/Q-Verhältnis produziert, während die Decke mit einem optimalen Strahl für eine gute Abdeckung und Formation gefahren wird.The back in the present case is therefore with a relatively low L / Q ratio produced while the ceiling with an optimal beam for good Cover and formation is driven.
In Strömungsrichtung S zwischen den Strömungsräumen 40, 42 und den zugeordneten
Querstromverteilern 44, 46 kann jeweils beispielsweise wieder ein Turbulenzerzeuger
48 bzw. 50 vorgesehen sein. In the flow direction S between the
- 1010
- Dreischicht-StoffauflaufThree-layer headbox
- 1212
- längerer Düsenraumlonger nozzle area
- 1414
- längerer Düsenraumlonger nozzle area
- 1616
- kürzerer Düsenraumshorter nozzle area
- 1818
- Austrittsspaltexit slit
- 2020
- Austrittsspaltexit slit
- 2222
- Austrittsspaltexit slit
- 2424
- QuerstromverteilerCross-flow distribution
- 2626
- QuerstromverteilerCross-flow distribution
- 2828
- QuerstromverteilerCross-flow distribution
- 3030
- Turbulenzerzeugerturbulence generator
- 3232
- Turbulenzerzeugerturbulence generator
- 3434
- Turbulenzerzeugerturbulence generator
- 34'34 '
- TurbulenzerzeugerabschnittTurbulence generator section
- 34"34 "
- TurbulenzerzeugerabschnittTurbulence generator section
- 3636
- Zwischenkammerintermediate chamber
- 3838
- Zweischicht-StoffauflaufTwo-layer headbox
- 4040
- kürzerer Düsenraumshorter nozzle area
- 4242
- längerer Düsenraumlonger nozzle area
- 4444
- QuerstromverteilerCross-flow distribution
- 4646
- QuerstromverteilerCross-flow distribution
- 4848
- Turbulenzerzeugerturbulence generator
- 5050
- Turbulenzerzeugerturbulence generator
- SS
- Strömungsrichtungflow direction
Claims (13)
dadurch gekennzeichnet, dass die Düsenräume (12-16; 40, 42) zumindest teilweise eine unterschiedliche in Strömungsrichtung (S) gemessene Länge besitzen.Multi-layer headbox (10; 38) for a paper machine, with a plurality of nozzle spaces (12-16; 40, 42), each of which is assigned to one of the different layers and in each of which a partial suspension flow assigned to the relevant layer up to an outlet gap provided at the end of the nozzle space (18-22),
characterized in that the nozzle spaces (12-16; 40, 42) at least partially have a different length measured in the flow direction (S).
dadurch gekennzeichnet, dass die maximale Düsenraumlänge etwa 800 mm beträgt.Multi-layer headbox according to claim 1,
characterized in that the maximum nozzle space length is about 800 mm.
dadurch gekennzeichnet, dass die minimale Düsenraumlänge kleiner oder gleich 400 mm, insbesondere kleiner oder gleich 350 mm und vorzugsweise etwa gleich 300 mm ist.Multi-layer headbox according to claim 1 or 2,
characterized in that the minimum nozzle space length is less than or equal to 400 mm, in particular less than or equal to 350 mm and preferably approximately equal to 300 mm.
dadurch gekennzeichnet, dass er für zumindest drei Schichten auslegt ist und dass die den beiden Aussenschichten zugeordneten Düsenräume (12, 14) eine größere Länge besitzen als zumindest ein einer mittleren Schicht zugeordneter Düsenraum (16).Multi-layer headbox according to one of the preceding claims,
characterized in that it is designed for at least three layers and that the nozzle spaces (12, 14) assigned to the two outer layers have a greater length than at least one nozzle space (16) assigned to a middle layer.
dadurch gekennzeichnet, dass die den beiden Aussenschichten zugeordneten Düsenräume (12, 14) eine gleiche Länge besitzen.Multi-layer headbox according to claim 4,
characterized in that the nozzle spaces (12, 14) assigned to the two outer layers have the same length.
dadurch gekennzeichnet, dass die Längendifferenz zwischen unterschiedlich langen Düsenräumen (12-16) durch eine in Strömungsrichtung betrachtet zwischen dem jeweils kürzeren Düsenraum (16) und dem betreffenden Querstromverteiler (28) angeordnete Zwischenkammer (36) überbrückt ist.Multi-layer headbox according to claim 4 or 5,
characterized in that the length difference between nozzle chambers (12-16) of different lengths is bridged by an intermediate chamber (36) arranged between the respectively shorter nozzle chamber (16) and the relevant cross-flow distributor (28) when viewed in the direction of flow.
dadurch gekennzeichnet, dass die Zwischenkammer (36) in Strömungsrichtung betrachtet zwischen zwei Turbulenzerzeugerabschnitten (34', 34") angeordnet ist.Multi-layer headbox according to claim 6,
characterized in that the intermediate chamber (36), viewed in the direction of flow, is arranged between two turbulence generator sections (34 ', 34 ").
dadurch gekennzeichnet, dass die den verschiedenen Schichten zugeordneten Querstromverteiler (24-28) entsprechend einer jeweiligen Längendifferenz zwischen unterschiedlich langen Düsenräumen (12-16) in Strömungsrichtung (S) gegeneinander versetzt sind.Multi-layer headbox according to one of the preceding claims,
characterized in that the cross-flow distributors (24-28) assigned to the different layers are offset from one another in the flow direction (S) in accordance with a respective length difference between nozzle spaces (12-16) of different lengths.
dadurch gekennzeichnet, dass er als Zweischicht-Stoffauflauf (38) ausgeführt ist und die den beiden Schichten zugeordneten Düsenräume (40, 42) eine unterschiedliche in Strömungsrichtung (S) gemessene Länge besitzen.Multi-layer headbox according to one of the preceding claims,
characterized in that it is designed as a two-layer headbox (38) and the nozzle spaces (40, 42) assigned to the two layers have a different length measured in the flow direction (S).
dadurch gekennzeichnet, dass der längere Düsenraum (40) einer Deckenschicht und der kürzere Düsenraum (42) einer Rückenschicht zugeordnet ist.Multi-layer headbox according to claim 9,
characterized in that the longer nozzle space (40) is assigned to a cover layer and the shorter nozzle space (42) is assigned to a back layer.
dadurch gekennzeichnet, dass die den beiden verschiedenen Schichten zugeordneten Querstromverteiler (44, 46) entsprechend der Längendifferenz zwischen den beiden unterschiedlich langen Düsenräumen (40, 42) in Strömungsrichtung (S) gegeneinander versetzt sind.Multi-layer headbox according to claim 9 or 10,
characterized in that the cross-flow distributors (44, 46) assigned to the two different layers are offset relative to one another in the direction of flow (S) according to the length difference between the two differently long nozzle spaces (40, 42).
dadurch gekennzeichnet, dass die Längendifferenz zwischen den beiden unterschiedlich langen Düsenräumen (42, 40) durch eine in Strömungsrichtung (S) betrachtet zwischen dem kürzeren Düsenraum (40) und dem betreffenden Querstromverteiler (44) angeordnete Zwischenkammer überbrückt ist.Multi-layer headbox according to claim 9 or 10,
characterized in that the length difference between the two differently long nozzle spaces (42, 40) is bridged by an intermediate chamber, viewed in the direction of flow (S), between the shorter nozzle space (40) and the relevant cross-flow distributor (44).
dadurch gekennzeichnet, dass die Zwischenkammer in Strömungsrichtung betrachtet zwischen zwei Turbulenzerzeugerabschnitten angeordnet ist.Multi-layer headbox according to claim 12,
characterized in that the intermediate chamber, viewed in the flow direction, is arranged between two turbulence generator sections.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10213853A DE10213853A1 (en) | 2002-03-27 | 2002-03-27 | Multi-layer headbox |
| DE10213853 | 2002-03-27 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1348803A2 true EP1348803A2 (en) | 2003-10-01 |
| EP1348803A3 EP1348803A3 (en) | 2004-03-10 |
| EP1348803B1 EP1348803B1 (en) | 2010-05-05 |
Family
ID=27798219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03100381A Expired - Lifetime EP1348803B1 (en) | 2002-03-27 | 2003-02-19 | Multi-layer headbox |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US6962646B2 (en) |
| EP (1) | EP1348803B1 (en) |
| AT (1) | ATE466994T1 (en) |
| DE (2) | DE10213853A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7588663B2 (en) * | 2006-10-20 | 2009-09-15 | Kimberly-Clark Worldwide, Inc. | Multiple mode headbox |
| US8871059B2 (en) * | 2012-02-16 | 2014-10-28 | International Paper Company | Methods and apparatus for forming fluff pulp sheets |
| EP3735487A1 (en) | 2018-01-05 | 2020-11-11 | International Paper Company | Paper products having increased bending stiffness and cross-direction strength and methods for making the same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4376012A (en) | 1979-04-12 | 1983-03-08 | Beloit Corporation | Method of forming a multi-ply web from paper stock |
| GB2119824A (en) | 1982-03-30 | 1983-11-23 | Karlstad Mekaniska Ab | Headbox |
| EP0581051B1 (en) | 1992-07-31 | 1995-11-29 | Voith Sulzer Papiermaschinen GmbH | Multi-layer headbox for a papermaking machine or the like |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI58364C (en) | 1977-07-13 | 1981-01-12 | Tampella Oy Ab | PROCEDURE FOR BANFORMING MACHINES FOR FRAMSTAELLNING AV EN TVAO- ELLER FLERSKIKTIG FIBERBANA |
| SE422091B (en) * | 1978-03-23 | 1982-02-15 | Karlstad Mekaniska Ab | INPUT CABLE FOR A PAPER MACHINE |
| SE421328B (en) * | 1978-04-25 | 1981-12-14 | Karlstad Mekaniska Ab | PROCEDURE AND DEVICE FOR IMAGE OF A MULTILAYER MELT Beam |
| US4376014A (en) * | 1979-04-12 | 1983-03-08 | Beloit Corporation | Headbox for forming multi-ply sheets |
| FI78750B (en) * | 1982-07-20 | 1989-05-31 | Escher Wyss Gmbh | FLERSKIKTSINLOPPSLAODA FOER MATANDE AV PAPPERSMASSA TILL EN VIRA. |
| DE3227218C2 (en) * | 1982-07-21 | 1984-10-18 | Escher Wyss Gmbh, 7980 Ravensburg | Multi-layer headbox |
| DE19624052A1 (en) * | 1996-06-17 | 1996-12-12 | Voith Sulzer Papiermasch Gmbh | Triple level papermaking stock inlet allowing wide range of adjustments |
-
2002
- 2002-03-27 DE DE10213853A patent/DE10213853A1/en not_active Withdrawn
-
2003
- 2003-02-19 EP EP03100381A patent/EP1348803B1/en not_active Expired - Lifetime
- 2003-02-19 DE DE50312683T patent/DE50312683D1/en not_active Expired - Lifetime
- 2003-02-19 AT AT03100381T patent/ATE466994T1/en active
- 2003-03-26 US US10/396,839 patent/US6962646B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4376012A (en) | 1979-04-12 | 1983-03-08 | Beloit Corporation | Method of forming a multi-ply web from paper stock |
| GB2119824A (en) | 1982-03-30 | 1983-11-23 | Karlstad Mekaniska Ab | Headbox |
| EP0581051B1 (en) | 1992-07-31 | 1995-11-29 | Voith Sulzer Papiermaschinen GmbH | Multi-layer headbox for a papermaking machine or the like |
Also Published As
| Publication number | Publication date |
|---|---|
| DE50312683D1 (en) | 2010-06-17 |
| ATE466994T1 (en) | 2010-05-15 |
| DE10213853A1 (en) | 2003-10-16 |
| EP1348803A3 (en) | 2004-03-10 |
| US6962646B2 (en) | 2005-11-08 |
| US20030183352A1 (en) | 2003-10-02 |
| EP1348803B1 (en) | 2010-05-05 |
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