EP4086388A1 - Apparatus and method for producing a fluid jet needled fibrous web from at least one fibrous suspension - Google Patents

Apparatus and method for producing a fluid jet needled fibrous web from at least one fibrous suspension Download PDF

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Publication number
EP4086388A1
EP4086388A1 EP22170735.9A EP22170735A EP4086388A1 EP 4086388 A1 EP4086388 A1 EP 4086388A1 EP 22170735 A EP22170735 A EP 22170735A EP 4086388 A1 EP4086388 A1 EP 4086388A1
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EP
European Patent Office
Prior art keywords
fluid
wire
suction
vacuum zone
fibrous
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EP22170735.9A
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German (de)
French (fr)
Inventor
Henning VOMHOF
Dennis Latendorf
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Andritz Kuesters GmbH
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Andritz Kuesters GmbH
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Publication of EP4086388A1 publication Critical patent/EP4086388A1/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H18/00—Needling machines
    • D04H18/04—Needling machines with water jets

Definitions

  • the invention relates to a system for producing a fluid-jet needled fibrous web from at least one fibrous stock suspension, with an inclined wire former, comprising a screen belt which runs around deflection rollers in a direction of rotation and has a laydown strand formed between a front deflection roller in the direction of rotation and a rear deflection roller in the direction of rotation, and a Headbox, by means of which the fibrous suspension can be deposited on the discharge strand of the wire while forming a fibrous web, and a method for producing a fluid-jet needled fibrous web from at least one fibrous suspension, with an inclined wire former
  • needling units In conventional systems for the production of fluid-jet needled, usually water-jet needled papers/nonwovens, separate needling units are regularly provided, which have a revolving screen belt whose dewatering and reflection properties are adapted to the respective production process.
  • the needling unit is designed in such a way that it allows a defined energy input by means of a fluid jet, suitable for example for the production speed and the product portfolio.
  • Inclined wire paper machines such as are used, for example, in the specialty paper industry, generally do not have a separate needling unit. she on the other hand, comprise an inclined wire former with a wire belt which runs around deflection rollers in a direction of rotation. It has a deposit strand formed between a front and a rear deflection roller in the direction of rotation and a headbox, by means of which the fibrous suspension can be deposited on the discharge strand of the wire belt to form the fibrous web.
  • Inclined wire paper machines designed in this way are often used, particularly in the specialty paper industry.
  • the demand for special papers that are not fluid-jet needled is declining, so that there is a desire to also be able to use these inclined wire paper machines for the production of fluid-jet-needled products, in particular nonwoven webs.
  • the invention also covers a method for converting an inclined wire paper machine into a system according to the invention according to claim 11, an inclined wire former having the features of claim 12 and a manufacturing method having the features of claim 13.
  • the front deflection roller in the direction of rotation of the wire belt is designed as a wire suction roller with a fluid-permeable roller shell and at least one vacuum zone provided within the roller shell. Furthermore, at least one nozzle bar is provided, by means of which jets of fluid can be discharged towards the screen belt under an overpressure in a region in which the screen belt runs around the screen suction roll.
  • suction rolls rotating from a forming or transport fabric have long been used as dewatering and deflection rolls in the paper industry. What is not known, however, is that these are also suitable for removing fluid that is released to the fibrous web for needling. It is surprising that the needling in the area of a wire suction roll can take place through the inclined wire despite the wire belt located between the fiber web and the wire suction roll.
  • fluid jet needling on cylinders, around which a fibrous web is guided is known from carded fleece technology. However, the fibrous web lies directly against these cylinders, ie without a screen belt located in between. And due to their design, these cylinders are also not suitable for absorbing the high tensile forces that a screen belt is regularly subjected to in comparison to a fibrous web.
  • the vacuum zone comprises at least one suction chamber that can be subjected to a negative pressure.
  • a plurality of nozzle bars spaced apart from one another in the direction of rotation of the filter belt are provided.
  • a plurality of vacuum zones can be formed within the roll shell.
  • the energy inputs can be adapted particularly well to the respective production speed and the respective product portfolio.
  • each vacuum zone is assigned to a nozzle bar in such a way that fluid discharged at least essentially from the assigned nozzle bar can be sucked off by means of the vacuum zone.
  • each vacuum zone comprises a suction chamber to which a negative pressure can be applied.
  • each suction chamber can preferably be subjected to a separately variable negative pressure.
  • At least one further nozzle bar is provided above the lay-off strand between the wire suction roll and the rear deflection roll.
  • each additional nozzle bar is assigned an additional vacuum zone in such a way that the vacuum zone can at least essentially suck off fluid discharged from the assigned nozzle bar.
  • each further vacuum zone has a suction box which is arranged below the discharge strand of the wire belt.
  • the invention is also embodied in a method for producing a system according to the invention, in which, in an inclined wire paper machine which has a wire belt which forms a laydown strand between a front and rear deflection roller in a direction of rotation of the wire belt, the front deflection roller is replaced by a wire suction roller with a fluid-permeable roller shell and at least one vacuum zone provided within the roller shell, and at least one nozzle bar is provided, by means of which fluid jets can be discharged under overpressure in an area in which the wire belt runs around the wire suction roller towards the wire belt.
  • the invention also relates to an inclined wire former of the plant according to the invention.
  • the invention also extends to a method for producing a fluid-jet needled fibrous web from at least one fibrous suspension, in which the fibrous suspension is applied to a wire belt of an inclined wire former, which runs around a wire suction roll in a direction of rotation, the fibrous suspension is subjected to fluid jets as it revolves around the wire suction roll, and fluid is sucked off by means of the wire suction roll.
  • the embodiment of the system according to the invention is designed to be suitable for the production of a fluid-jet needled fibrous web.
  • the system 100 comprises an inclined wire former 10 for providing a fiber web 13 comprising fibers 12 from a fiber suspension 11.
  • the fibers have an average fiber length of regularly >1 mm to a maximum of 30 mm, the fiber web 13 has a weight per unit area, for example between 7 and 100 grams per Square meters.
  • the inclined wire former 10 comprises a revolving screen belt 14 which revolves counterclockwise around deflection rollers 15 . It forms a storage strand 16, whose front end in the direction of rotation is formed by a front deflection roller 15' and whose rear end in the direction of rotation is formed by a rear deflection roller 15''.
  • the inclined wire former 10 also includes a headbox 17, by means of which the fibers 12--for example as a fibrous suspension--are deposited to form the fibrous web 13.
  • the front deflection roller 15' is designed as a wire suction roller 35.
  • the wire suction roll 35 includes a rotatably mounted roll shell 36, which includes a plurality of bores 37. Within the roll shell 36, two vacuum zones 38, 39 are provided, which each have a suction chamber 40, 41.
  • the suction chambers 40, 41 each have an opening 42, 43 extending in the longitudinal direction of the wire suction roll 35, the edges 44, 45, 46 of which are sealed in an at least essentially gas-tight manner.
  • two nozzle beams 48, 49 are provided spaced apart from one another in the direction of rotation of the screen belt. They are arranged in such a way that pressurized fluid jets, in particular water jets, can be released towards the screen belt.
  • the openings 42, 43 of the suction chambers 40, 41 are aligned in such a way that each of the suction chambers 40, 41 is assigned to one of the nozzle bars 48, 49 in such a way that at least essentially the fluid discharged from the assigned nozzle bar is sucked off by means of each suction chamber.
  • a further vacuum zone 53, 54, 55 in the form of a suction box 56 is assigned to the inside in each case.
  • the other nozzle bars 50, 51, 52 serve to pre-consolidate the fibers 12 to form the fiber web 13.
  • further nozzle bars (not shown in the drawing) and associated vacuum zones can be provided in the direction of rotation of the wire 14 behind the wire suction roll in an area 18 that slopes downwards in relation to the direction of rotation.
  • a removal roller 19 can be provided, which can be subjected to a negative pressure, for example, with which the solidified fibrous web 20 can be removed from the screen belt 14 and can then be supplied for further use or processing.
  • a take-off roller 19 can be provided in particular when the fibrous web 20 has a low basis weight or low strength, or the peripheral speed the screen belt 14 is high. Otherwise, the fibrous web can also be removed from the wire belt 14 in the open train. A take-off roller 19 is then not required.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

Anlage sowie Verfahren zur Herstellung einer fluidstrahlvernadelten Faserstoffbahn (20) aus mindestens einer Faserstoffsuspension (11), wobei die Faserstoffsuspension (11) unter Bildung eines Faserflors (13) auf ein Siebband (14) eines Schrägsiebformers (10), welcher in einer Umlaufrichtung eine Siebsaugwalze (35) umläuft, aufgebracht wird, der Faserflor (13)beim Umlauf um die Siebsaugwalze (35) mithilfe von Düsenbalken (48, 49) mit Fluidstrahlen beaufschlagt wird, und Fluid mittels mindestens einer innerhalb eines Walzenmantels (36) der Siebsaugwalze (35) vorgesehenen Vakuumzone (38, 39) abgesaugt wird.Plant and method for producing a fluid-jet needled fibrous web (20) from at least one fibrous suspension (11), the fibrous suspension (11) forming a fibrous web (13) on a wire (14) of an inclined wire former (10) which has a wire suction roll in one direction of rotation (35) circulates, is applied, the fibrous web (13) is subjected to fluid jets as it revolves around the wire suction roll (35) using nozzle bars (48, 49), and fluid is applied by means of at least one inside a roll shell (36) of the wire suction roll (35) provided vacuum zone (38, 39) is sucked off.

Description

Die Erfindung betrifft eine Anlage zur Herstellung einer fluidstrahlvernadelten Faserstoffbahn aus mindestens einer Faserstoffsuspension, mit einem Schrägsiebformer, umfassend ein Siebband, welches in einer Umlaufrichtung um Umlenkwalzen umläuft und ein zwischen einer in Umlaufrichtung vorderer Umlenkwalze und einer in Umlaufrichtung hinterer Umlenkwalze gebildetes Ablegetrum aufweist, und einen Stoffauflauf, mittels welchem die Faserstoffsuspension auf dem Ablegetrum des Siebbandes unter Bildung eines Faserflors ablegbar ist, und ein Verfahren zur Herstellung einer fluidstrahlvernadelten Faserstoffbahn aus mindestens einer Faserstoffsuspension, mit einem SchrägsiebformerThe invention relates to a system for producing a fluid-jet needled fibrous web from at least one fibrous stock suspension, with an inclined wire former, comprising a screen belt which runs around deflection rollers in a direction of rotation and has a laydown strand formed between a front deflection roller in the direction of rotation and a rear deflection roller in the direction of rotation, and a Headbox, by means of which the fibrous suspension can be deposited on the discharge strand of the wire while forming a fibrous web, and a method for producing a fluid-jet needled fibrous web from at least one fibrous suspension, with an inclined wire former

Bei herkömmlichen Anlagen zur Herstellung von fluidstrahlvernadelten, üblicherweise wasserstrahlvernadelten Papieren/Vliesstoffen sind regelmäßig separate Vernadelungseinheiten vorgesehen, die ein umlaufendendes Siebband aufweisen, dessen Entwässerung- und Reflektionseigenschaften an den jeweiligen Herstellungsprozess angepasst sind. Die Vernadelungseinheit ist derart ausgestaltet, dass sie einen definierten Energieeintrag mittels Fluidstrahl, passend bspw. zur Produktionsgeschwindigkeit und zum Produktportfolio, erlaubt.In conventional systems for the production of fluid-jet needled, usually water-jet needled papers/nonwovens, separate needling units are regularly provided, which have a revolving screen belt whose dewatering and reflection properties are adapted to the respective production process. The needling unit is designed in such a way that it allows a defined energy input by means of a fluid jet, suitable for example for the production speed and the product portfolio.

Schrägsiebpapiermaschinen, wie sie bspw. in der Spezialpapierindustrie Verwendung finden, weisen regelmäßig eine separate Vernadelungseinheit nicht auf. Sie umfassen hingegen einen Schrägsiebformer mit einem Siebband, welches in einer Umlaufrichtung um Umlenkwalzen läuft. Es weist ein zwischen einer in Umlaufrichtung vorderen und einer in Umlaufrichtung hinteren Umlenkwalze gebildetes Ablegetrum auf sowie einen Stoffauflauf, mittels welchem die Faserstoffsuspension auf dem Ablagetrum des Siebbandes zur Bildung des Faserflors ablegbar ist.Inclined wire paper machines, such as are used, for example, in the specialty paper industry, generally do not have a separate needling unit. she on the other hand, comprise an inclined wire former with a wire belt which runs around deflection rollers in a direction of rotation. It has a deposit strand formed between a front and a rear deflection roller in the direction of rotation and a headbox, by means of which the fibrous suspension can be deposited on the discharge strand of the wire belt to form the fibrous web.

Derart ausgebildete Schrägsiebpapiermaschinen befinden sich insbesondere in der Spezialpapierindustrie vielfach im Einsatz. Allerdings ist der Bedarf an nicht fluidstrahlvernadelten Spezialpapierenrückläufig, sodass das Bestreben besteht, diese Schrägsiebpapiermaschinen auch zur Herstellung fluidstrahlvernadelter Produkte, insbesondere von Vliesbahnen, einsetzen zu können.Inclined wire paper machines designed in this way are often used, particularly in the specialty paper industry. However, the demand for special papers that are not fluid-jet needled is declining, so that there is a desire to also be able to use these inclined wire paper machines for the production of fluid-jet-needled products, in particular nonwoven webs.

Diese Aufgabe wird durch eine Anlage mit den Merkmalen des Anspruchs 1 gelöst. Die Erfindung erfasst auch ein Verfahren zum Umbau einer Schrägsiebpapiermaschine in eine erfindungsgemäße Anlage gemäß Anspruch 11, einen Schrägsiebformer mit den Merkmalen des Anspruchs 12 und ein Herstellungsverfahren mit den Merkmalen des Anspruchs 13.This object is achieved by a system with the features of claim 1. The invention also covers a method for converting an inclined wire paper machine into a system according to the invention according to claim 11, an inclined wire former having the features of claim 12 and a manufacturing method having the features of claim 13.

Bei der erfindungsgemäßen Anlage ist die in Umlaufrichtung des Siebbandes vordere Umlenkwalze als Siebsaugwalze mit einem fluiddurchlässigen Walzenmantel und mindestens einer innerhalb des Walzenmantels vorgesehenen Vakuumzone ausgebildet. Ferner ist mindestens ein Düsenbalken vorgesehen, mittels welchem Fluidstrahlen unter einem Überdruck in einem Bereich, in dem das Siebband die Siebsaugwalze umläuft, zum Siebband hin abgebbar sind. Überraschenderweise hat sich gezeigt, dass es aufgrund dieser Weiterbildung möglich ist, einen Energieeintrag mittels Fluidstrahlen bereitzustellen, der geeignet ist, auch andere Faserstoffbahnen als Spezialpapiere, bspw. nassgelegter Vliesstoffe, herzustellen.In the plant according to the invention, the front deflection roller in the direction of rotation of the wire belt is designed as a wire suction roller with a fluid-permeable roller shell and at least one vacuum zone provided within the roller shell. Furthermore, at least one nozzle bar is provided, by means of which jets of fluid can be discharged towards the screen belt under an overpressure in a region in which the screen belt runs around the screen suction roll. Surprisingly, it has been shown that this development makes it possible to provide an energy input by means of fluid jets that is suitable for producing fibrous webs other than special papers, for example wet-laid nonwovens.

Zwar werden von einem Formier- oder Transportsieb umlaufende Siebsaugwalzen als Entwässerungs- und Umlenkwalzen seit längerem in der Papierindustrie eingesetzt. Nicht bekannt ist jedoch, dass diese auch zum Abführen von zur Vernadelung an den Faserflor abgegebenes Fluid geeignet sind. Es ist überraschend, dass die Vernadelung im Bereich einer Siebsaugwalze trotz des zwischen des Faserflors und der Siebsaugwalze befindlichen Siebbandes durch das Schrägsieb erfolgen kann. Bekannt aus der Krempelvliestechnologie ist hingegen eine Fluidstrahlvernadelung auf Zylindern, um die eine Faserstoffbahn herumgeführt wird. Die Faserstoffbahn liegt jedoch an diesen Zylindern unmittelbar, d. h. ohne ein dazwischen befindliches Siebband an. Und diese Zylinder sind bauartbedingt auch nicht geeignet, die hohen Zugkräfte, unter denen ein Siebband im Vergleich zu einer Faserstoffbahn regelmäßig steht, aufzunehmen.It is true that suction rolls rotating from a forming or transport fabric have long been used as dewatering and deflection rolls in the paper industry. What is not known, however, is that these are also suitable for removing fluid that is released to the fibrous web for needling. It is surprising that the needling in the area of a wire suction roll can take place through the inclined wire despite the wire belt located between the fiber web and the wire suction roll. On the other hand, fluid jet needling on cylinders, around which a fibrous web is guided, is known from carded fleece technology. However, the fibrous web lies directly against these cylinders, ie without a screen belt located in between. And due to their design, these cylinders are also not suitable for absorbing the high tensile forces that a screen belt is regularly subjected to in comparison to a fibrous web.

Bei einer bevorzugten Ausführungsform der erfindungsgemäßen Anlage umfasst die Vakuumzone mindestens eine mit einem Unterdruck beaufschlagbare Saugkammer. Es hat sich überraschender Weise gezeigt, dass aufgrund dieser Maßnahme der Energieeintrag durch die Wasserstrahlen an die zur Vliesvernadelung erforderlichen Werte effektiv anpassbar ist.In a preferred embodiment of the system according to the invention, the vacuum zone comprises at least one suction chamber that can be subjected to a negative pressure. Surprisingly, it has been shown that due to this measure, the energy input through the water jets can be effectively adapted to the values required for needling of the fleece.

Um den mittels der Fluidstrahlen möglichen Energieeintrag weiter erhöhen zu können, sind bei einer bevorzugten Ausführungsform der erfindungsgemäßen Anlage eine Mehrzahl von in Umlaufrichtung des Siebbandes voneinander beabstandete Düsenbalken vorgesehen.In order to be able to further increase the energy input possible by means of the fluid jets, in a preferred embodiment of the system according to the invention, a plurality of nozzle bars spaced apart from one another in the direction of rotation of the filter belt are provided.

Innerhalb des Walzenmantels können ferner eine Mehrzahl von Vakuumzonen ausgebildet sein.Furthermore, a plurality of vacuum zones can be formed within the roll shell.

Sind die Düsenbalken unabhängig voneinander mit einem Fluid beaufschlagbar oder - besonders bevorzugt - die Fluiddrücke der Düsenbalken unabhängig voneinander beeinflussbar, so können die Energieeinträge besonders gut an die jeweilige Produktionsgeschwindigkeit und das jeweilige Produktportfolio angepasst werden.If a fluid can be applied to the nozzle bars independently of one another or—particularly preferred—the fluid pressures of the nozzle bars can be influenced independently of one another, the energy inputs can be adapted particularly well to the respective production speed and the respective product portfolio.

Hierzu ist es vorteilhaft, wenn - wie bei einer des Weiteren bevorzugten Ausführungsform - jede Vakuumzone einem Düsenbalken derart zugeordnet ist, dass mittels der Vakuumzone zumindest im Wesentlichen von dem zugeordneten Düsenbalken abgegebenes Fluid absaugbar ist.To this end, it is advantageous if--as in a further preferred embodiment--each vacuum zone is assigned to a nozzle bar in such a way that fluid discharged at least essentially from the assigned nozzle bar can be sucked off by means of the vacuum zone.

Bei einer konstruktiv bevorzugten Ausführungsform der erfindungsgemäßen Anlage umfasst jede Vakuumzone eine Saugkammer, die mit einem Unterdruck beaufschlagbar ist.In a structurally preferred embodiment of the system according to the invention, each vacuum zone comprises a suction chamber to which a negative pressure can be applied.

Im Hinblick auf eine möglichst gute Anpassbarkeit des Energieeintrags ist jede Saugkammer vorzugsweise mit einem separat variierbaren Unterdruck beaufschlagbar.With regard to the best possible adjustability of the energy input, each suction chamber can preferably be subjected to a separately variable negative pressure.

Um den maximal mit den Fluidstrahlen möglichen Energieeintrag erhöhen zu können, ist bei einer besonders bevorzugten Ausführungsform der erfindungsgemäßen Anlage zwischen der Siebsaugwalze und der hinteren Umlenkwalze mindestens ein weiterer Düsenbalken oberhalb des Ablegetrums vorgesehen.In order to be able to increase the maximum possible energy input with the fluid jets, in a particularly preferred embodiment of the system according to the invention, at least one further nozzle bar is provided above the lay-off strand between the wire suction roll and the rear deflection roll.

Um dann abermals den Energieeintrag bestmöglich anpassen zu können, ist bei einer bevorzugten Ausführungsform der erfindungsgemäßen Anlage jedem weiteren Düsenbalken eine weitere Vakuumzone derart zugeordnet, dass mittels der Vakuumzone zumindest im Wesentlichen von dem zugeordneten Düsenbalken abgegebenes Fluid absaugbar ist.In order to then be able to adapt the energy input as best as possible, in a preferred embodiment of the system according to the invention, each additional nozzle bar is assigned an additional vacuum zone in such a way that the vacuum zone can at least essentially suck off fluid discharged from the assigned nozzle bar.

Bei einer konstruktiv bevorzugten Ausführungsform der erfindungsgemäßen Anlage weist jede weitere Vakuumzone einen Saugkasten auf, der unterhalb des Ablegetrums des Siebbandes angeordnet ist.In a structurally preferred embodiment of the plant according to the invention, each further vacuum zone has a suction box which is arranged below the discharge strand of the wire belt.

Die Erfindung verkörpert sich auch in einem Verfahren zur Herstellung einer erfindungsgemäßen Anlage, in dem bei einer Schrägsiebpapiermaschine, die ein Siebband aufweist, welches zwischen einer in einer Umlaufrichtung des Siebbandes vorderen und hinteren Umlenkwalze ein Ablegetrum bildet, die vordere Umlenkwalze durch eine Siebsaugwalze mit einem fluiddurchlässigen Walzenmantel und mindestens einer innerhalb des Walzenmantels vorgesehenen Vakuumzone ausgebildet ist, ausgetauscht und mindestens ein Düsenbalken vorgesehen wird, mittels welchem Fluidstrahlen unter einem Überdruck in einem Bereich, in dem das Siebband die Siebsaugwalze umläuft, zum Siebband hin abgebbar sind.The invention is also embodied in a method for producing a system according to the invention, in which, in an inclined wire paper machine which has a wire belt which forms a laydown strand between a front and rear deflection roller in a direction of rotation of the wire belt, the front deflection roller is replaced by a wire suction roller with a fluid-permeable roller shell and at least one vacuum zone provided within the roller shell, and at least one nozzle bar is provided, by means of which fluid jets can be discharged under overpressure in an area in which the wire belt runs around the wire suction roller towards the wire belt.

Die Erfindung betrifft auch einen Schrägsiebformer der erfindungsgemäßen Anlage.The invention also relates to an inclined wire former of the plant according to the invention.

Die Erfindung erstreckt sich darüber hinaus auf ein Verfahren zur Herstellung einer fluidstrahlvernadelten Faserstoffbahn aus mindestens einer Faserstoffsuspension, bei welchem die Faserstoffsuspension auf ein Siebband eines Schrägsiebformers, welches in einer Umlaufrichtung eine Siebsaugwalze umläuft, aufgebracht, die Faserstoffsuspension beim Umlauf um die Siebsaugwalze mit Fluidstrahlen beaufschlagt und Fluid mittels der Siebsaugwalze abgesaugt wird.The invention also extends to a method for producing a fluid-jet needled fibrous web from at least one fibrous suspension, in which the fibrous suspension is applied to a wire belt of an inclined wire former, which runs around a wire suction roll in a direction of rotation, the fibrous suspension is subjected to fluid jets as it revolves around the wire suction roll, and fluid is sucked off by means of the wire suction roll.

Die Erfindung soll nachfolgend anhand der rein schematischen Zeichnungen weiter verdeutlicht werden. Es zeigen:

Fig. 1
ein Ausführungsbeispiel einer erfindungsgemäßen Anlage sowie
Fig. 2
den Ausschnitt II in Fig. 1 in einer vergrößerten, teilweise geschnittenen Darstellung.
The invention is to be further clarified below with reference to the purely schematic drawings. Show it:
1
an embodiment of a system according to the invention and
2
the section II in 1 in an enlarged, partially cut view.

Die in Fig. 1 als Ganzes mit 100 bezeichnete Ausführungsform der erfindungsgemäßen Anlage ist zur Herstellung einer fluidstrahlvernadelten Faserstoffbahn geeignet ausgebildet.In the 1 The embodiment of the system according to the invention, denoted as a whole by 100, is designed to be suitable for the production of a fluid-jet needled fibrous web.

Die Anlage 100 umfasst einen Schrägsiebformer 10 zur Bereitstellung eines Fasern 12 umfassenden Faserflors 13 aus einer Faserstoffsuspension 11. Die Fasern weisen eine mittlere Faserlänge von regelmäßig >1 mm bis maximal 30 mm auf, der Faserflor 13 ein Flächengewicht bspw. zwischen 7 und 100 Gramm pro Quadratmeter. Der Schrägsiebformer 10 umfasst zur Bereitstellung des Faserflors 13 ein umlaufendes Siebband 14, welches um Umlenkwalzen 15 entgegen dem Uhrzeigersinn umläuft. Es bildet ein Ablagetrum 16, dessen in Umlaufrichtung vorderes Ende von einer vorderen Umlenkwalze 15' und dessen in Umlaufrichtung hinteres Ende von einer hinteren Umlenkwalze 15" gebildet ist.The system 100 comprises an inclined wire former 10 for providing a fiber web 13 comprising fibers 12 from a fiber suspension 11. The fibers have an average fiber length of regularly >1 mm to a maximum of 30 mm, the fiber web 13 has a weight per unit area, for example between 7 and 100 grams per Square meters. To provide the fibrous web 13 , the inclined wire former 10 comprises a revolving screen belt 14 which revolves counterclockwise around deflection rollers 15 . It forms a storage strand 16, whose front end in the direction of rotation is formed by a front deflection roller 15' and whose rear end in the direction of rotation is formed by a rear deflection roller 15''.

Der Schrägsiebformer 10 umfasst des Weiteren einen Stoffauflauf 17, mittels welchem die Fasern 12 - bspw. als Faserstoffsuspension - zur Bildung des Faserflors 13 abgelegt werden.The inclined wire former 10 also includes a headbox 17, by means of which the fibers 12--for example as a fibrous suspension--are deposited to form the fibrous web 13.

Um den Faserflor 13 zu einer Faserstoffbahn 20 verfestigen zu können, ist die vordere Umlenkwalze 15' als Siebsaugwalze 35 ausgebildet. Wie in Fig. 2 erkennbar ist, umfasst die Siebsaugwalze 35 einen rotierbar gelagerten Walzenmantel 36, der eine Vielzahl von Bohrungen 37 umfasst. Innerhalb des Walzenmantels 36 sind zwei Vakuumzonen 38, 39 vorgesehen, welche jeweils eine Saugkammer 40, 41 aufweisen. Die Saugkammern 40, 41 weisen jeweils eine sich in Längsrichtung der Siebsaugwalze 35 erstreckende Öffnung 42, 43 auf, deren Ränder 44, 45, 46 zumindest im Wesentlichen gasdicht abgedichtet sind.In order to be able to solidify the fibrous web 13 into a fibrous web 20, the front deflection roller 15' is designed as a wire suction roller 35. As in 2 can be seen, the wire suction roll 35 includes a rotatably mounted roll shell 36, which includes a plurality of bores 37. Within the roll shell 36, two vacuum zones 38, 39 are provided, which each have a suction chamber 40, 41. The suction chambers 40, 41 each have an opening 42, 43 extending in the longitudinal direction of the wire suction roll 35, the edges 44, 45, 46 of which are sealed in an at least essentially gas-tight manner.

In dem Bereich, in welchem das Siebband 14 an dem Walzenmantel 36 anliegt, sind in Umlaufrichtung des Siebbandes voneinander beabstandet zwei Düsenbalken 48, 49 vorgesehen. Sie sind derart angeordnet ausgebildet, dass unter Druck stehende Fluidstrahlen, insbesondere Wasserstrahlen, zum Siebband hin abgebbar sind. Die Öffnungen 42, 43 der Saugkammern 40, 41 sind so ausgerichtet, dass jede der Saugkammern 40, 41 einem der Düsenbalken 48, 49 dahingehend zugeordnet ist, dass mittels jeder Saugkammer zumindest im Wesentlichen das von dem zugeordneten Düsenbalken abgegebene Fluid abgesaugt wird.In the area in which the screen belt 14 bears against the roller shell 36, two nozzle beams 48, 49 are provided spaced apart from one another in the direction of rotation of the screen belt. They are arranged in such a way that pressurized fluid jets, in particular water jets, can be released towards the screen belt. The openings 42, 43 of the suction chambers 40, 41 are aligned in such a way that each of the suction chambers 40, 41 is assigned to one of the nozzle bars 48, 49 in such a way that at least essentially the fluid discharged from the assigned nozzle bar is sucked off by means of each suction chamber.

Drei weitere, in Umlaufrichtung des Siebbandes 14 voneinander beabstandete Düsenbalken 50, 51, 52 sind in Umlaufrichtung des Siebbandes vor der Siebsaugwalze 35 angeordnet. Innen ist jeweils eine weitere Vakuumzone 53, 54, 55 in Form jeweils eines Saugkastens 56 zugeordnet. Die weiteren Düsenbalken 50, 51, 52 dienen der Vorverfestigung der Fasern 12 zum Faserfloor 13. Durch die Düsenbalken 48, 49, denen die Vakuumzonen 38, 39 der Siebsaugwalze zugeordnet sind, erfolgt eine weitere Verfestigung des Faserflors zur Faserstoffbahn 20.Three further nozzle bars 50, 51, 52, which are spaced apart from one another in the direction of rotation of the wire 14, are arranged in front of the suction roller 35 in the direction of rotation of the wire. A further vacuum zone 53, 54, 55 in the form of a suction box 56 is assigned to the inside in each case. The other nozzle bars 50, 51, 52 serve to pre-consolidate the fibers 12 to form the fiber web 13. The nozzle bars 48, 49, to which the vacuum zones 38, 39 of the wire suction roll are assigned, result in a further consolidation of the fiber web into the fibrous web 20.

Besteht der Bedarf an einer Intensivierung der Verfestigung, so können in Umlaufrichtung des Siebbandes 14 hinter der Siebsaugwalze in einem Bereich 18, der bezogen auf die Umlaufrichtung schräg abfällt, weitere, in der Zeichnung nicht dargestellte Düsenbalken und zugeordnete Vakuumzonen vorgesehen sein..If there is a need to intensify the solidification, further nozzle bars (not shown in the drawing) and associated vacuum zones can be provided in the direction of rotation of the wire 14 behind the wire suction roll in an area 18 that slopes downwards in relation to the direction of rotation.

In dem Bereich 18 des Siebbandes 14 kann eine bspw. mit einem Unterdruck beaufschlagbare Abnahmewalze 19 vorgesehen, mit welcher die verfestigte Faserstoffbahn 20 von dem Siebband 14 abnehmbar und hiernach einer weiteren Verwendung oder Bearbeitung zuführbar ist. Eine derartige Abnahmewalze 19 kann insbesondere dann vorgesehen sein, wenn die Faserstoffbahn 20 ein niedriges Flächengewicht oder eine geringe Festigkeit aufweist, oder die Umlaufgeschwindigkeit des Siebbandes 14 hoch ist. Ansonsten kann die Abnahme der Faserstoffbahn vom Siebband 14 auch im freien Zug erfolgen. Eine Abnahmewalze 19 ist dann nicht erforderlich.In the area 18 of the screen belt 14, a removal roller 19 can be provided, which can be subjected to a negative pressure, for example, with which the solidified fibrous web 20 can be removed from the screen belt 14 and can then be supplied for further use or processing. Such a take-off roller 19 can be provided in particular when the fibrous web 20 has a low basis weight or low strength, or the peripheral speed the screen belt 14 is high. Otherwise, the fibrous web can also be removed from the wire belt 14 in the open train. A take-off roller 19 is then not required.

Bezuaszeichenliste:reference list:

100100
Anlageattachment
1010
Schrägsiebformerinclined wire former
1111
Faserstoffsuspensionpulp suspension
1212
Fasernfibers
1313
Faserflorfiber batt
1414
Siebbandmain web
1515
Umlenkwalzendeflection rollers
15'15'
vordere Umlenkwalzefront deflection roller
15"15"
hintere Umlenkwalzerear deflection roller
1616
Ablegetrumdischarge strand
1717
Stoffauflaufheadbox
1818
Bereicharea
1919
Abnahmewalzetake-off roller
2020
Faserstoffbahnfibrous web
3535
Siebsaugwalzewire suction roll
3636
Walzenmantelroller shell
3737
Bohrungendrilling
3838
Vakuumzonevacuum zone
3939
Vakuumzonevacuum zone
4040
Saugkammersuction chamber
4141
Saugkammersuction chamber
4242
Öffnungopening
4343
Öffnungopening
4444
Randedge
4545
Randedge
4646
Randedge
4747
innere Mantelflächeinner surface
4848
Düsenbalkennozzle bar
4949
Düsenbalkennozzle bar
5050
Düsenbalkennozzle bar
5151
Düsenbalkennozzle bar
5252
Düsenbalkennozzle bar
5353
Vakuumzonevacuum zone
5454
Vakuumzonevacuum zone
5555
Vakuumzonevacuum zone
5656
Saugkastensuction box

Claims (14)

Anlage (100) zur Herstellung einer fluidstrahlvernadelten Faserstoffbahn (20) aus mindestens einer Faserstoffsuspension (11), mit einem Schrägsiebformer (10), umfassend - ein Siebband (14), welches in einer Umlaufrichtung um Umlenkwalzen (15) umläuft und ein zwischen einer in Umlaufrichtung vorderen Umlenkwalze (15') und einer in Umlaufrichtung hinteren Umlenkwalze (15") gebildetes Ablegetrum (16) aufweist, und - einen Stoffauflauf (17), mittels welchem die Faserstoffsuspension auf dem Ablegetrum (16) des Siebbandes (14) ablegbar ist, dadurch gekennzeichnet, dass die in Umlaufrichtung vordere Umlenkwalze (15') als Siebsaugwalze (35) mit einem fluiddurchlässigen Walzenmantel (36) und mindestens einer innerhalb des Walzenmantels (36) vorgesehenen Vakuumzone (38, 39) ausgebildet ist, und dass mindestens ein Düsenbalken (48, 49) vorgesehen ist, mittels welchem Fluidstrahlen unter einem Überdruck in einem Bereich, in dem das Siebband (14) die Siebsaugwalze (35) umläuft, zum Siebband (14) hin abgebbar sind. Plant (100) for producing a fluid-jet needled fibrous web (20) from at least one fibrous suspension (11), with an inclined wire former (10), comprising - a screen belt (14), which runs around deflection rollers (15) in a direction of rotation and has a discharge strand (16) formed between a front deflection roller (15') in the direction of rotation and a rear deflection roller (15") in the direction of rotation, and - a headbox (17) by means of which the fibrous suspension can be deposited on the deposit strand (16) of the wire (14), characterized, that the front deflection roll (15') in the direction of rotation is designed as a wire suction roll (35) with a fluid-permeable roll shell (36) and at least one vacuum zone (38, 39) provided inside the roll shell (36), and that at least one nozzle bar (48, 49) is provided, by means of which fluid jets can be discharged towards the screen belt (14) under an overpressure in an area in which the screen belt (14) runs around the screen suction roller (35). Anlage nach Anspruch 1, dadurch gekennzeichnet, dass die Vakuumzone (38, 39) mindestens eine mit einem Unterdruck beaufschlagbare Saugkammer (40, 41) umfasst.Plant according to Claim 1, characterized in that the vacuum zone (38, 39) comprises at least one suction chamber (40, 41) which can be subjected to a negative pressure. Anlage nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass eine Mehrzahl von in Umlaufrichtung des Siebbandes (14) voneinander beabstandete Düsenbalken (48, 49) vorgesehen sind.Plant according to Claim 1 or 2, characterized in that a plurality of nozzle bars (48, 49) spaced apart from one another in the direction of rotation of the filter belt (14) are provided. Anlage nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass innerhalb des Walzenmantels (36) eine Mehrzahl von Vakuumzonen (38, 39) ausgebildet sind.Plant according to one of Claims 1 to 3, characterized in that a plurality of vacuum zones (38, 39) are formed within the roll shell (36). Anlage nach Anspruch 4, dadurch gekennzeichnet, dass jede Vakuumzone (38, 39) einem Düsenbalken (48, 49) derart zugeordnet ist, dass mittels der Vakuumzone (38, 39) zumindest im Wesentlichen von dem zugeordneten Düsenbalken (48, 49) abgegebenes Fluid absaugbar ist.Plant according to claim 4, characterized in that each vacuum zone (38, 39) is associated with a nozzle bar (48, 49) such that by means of vacuum zone (38, 39) at least substantially from the associated nozzle bar (48, 49) discharged fluid can be sucked off. Anlage nach Anspruch 5, dadurch gekennzeichnet, dass jede Vakuumzone (38, 39) eine Saugkammer (40, 41) umfasst, die mit einem Unterdruck beaufschlagbar ist.Plant according to Claim 5, characterized in that each vacuum zone (38, 39) comprises a suction chamber (40, 41) which can be subjected to a negative pressure. Anlage nach Anspruch 6, dadurch gekennzeichnet, dass jede Saugkammer (40, 41) mit einem separat variierbaren Unterdruck beaufschlagbar ist.Plant according to Claim 6, characterized in that each suction chamber (40, 41) can be subjected to a separately variable negative pressure. Anlage nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass zwischen der Siebsaugwalze (35) und der hinteren Umlenkwalze (15") mindestens ein weiterer Düsenbalken (50, 51, 52) oberhalb des Ablegetrums (16) vorgesehen ist.Installation according to one of Claims 1 to 7, characterized in that at least one further nozzle bar (50, 51, 52) is provided above the laying strand (16) between the wire suction roll (35) and the rear deflection roll (15"). Anlage nach Anspruch 8, dadurch gekennzeichnet, dass jedem weiteren Düsenbalken (50, 51, 52) eine weitere Vakuumzone (53, 54, 55) derart zugeordnet ist, dass mittels der Vakuumzone (53, 54, 55) zumindest im Wesentlichen von dem zugeordneten Düsenbalken (50, 51, 52) abgegebenes Fluid absaugbar ist.System according to Claim 8, characterized in that each additional nozzle bar (50, 51, 52) is assigned an additional vacuum zone (53, 54, 55) in such a way that, by means of the vacuum zone (53, 54, 55), at least essentially the assigned Nozzle bar (50, 51, 52) discharged fluid can be sucked off. Anlage nach Anspruch 9, dadurch gekennzeichnet, dass jede weitere Vakuumzone (53, 54, 55 einen Saugkasten (50) aufweist, der unterhalb des Ablagetrums (16) angeordnet ist.Plant according to Claim 9, characterized in that each further vacuum zone (53, 54, 55) has a suction box (50) which is arranged below the collection strand (16). Verfahren zur Herstellung einer Anlage (100) zur Herstellung einer fluidstrahlvernadelten Faserstoffbahn (20) aus mindestens einer Faserstoffsuspension (11) nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass bei einer Schrägsiebpapiermaschine, die ein Siebband (14) aufweist, welches zwischen einer in einer Umlaufrichtung des Siebbandes (14) vorderen und hinteren Umlenkwalze (15', 15") ein Ablegetrum (16) bildet, die vordere Umlenkwalze (15') durch eine Siebsaugwalze (35) mit einem fluiddurchlässigen Walzenmantel (36) und mindestens einer innerhalb des Walzenmantels (36) vorgesehenen Vakuumzone (38, 39) ausgebildet ist, ausgetauscht und mindestens ein Düsenbalken (48, 49) vorgesehen wird, mittels welchem Fluidstrahlen unter einem Überdruck in einem Bereich, in dem das Siebband (14) die Siebsaugwalze (35) umläuft, zum Siebband (14) hin abgebbar sind.Method for producing a plant (100) for producing a fluid jet needled fibrous web (20) from at least one fibrous stock suspension (11) according to one of Claims 1 to 10, characterized in that in an inclined wire paper machine which has a wire belt (14) which is between a in a direction of rotation of the screen belt (14), the front and rear deflection rollers (15', 15") form a deposit strand (16), the front deflection roller (15') by a screen suction roller (35) with a fluid-permeable roller jacket (36) and at least one inside of the roll shell (36) provided vacuum zone (38, 39) is formed, exchanged and at least one nozzle bar (48, 49) is provided, by means of which Fluid jets under an overpressure in an area in which the screen belt (14) circulates the screen suction roller (35), towards the screen belt (14) can be released. Schrägsiebformer (10) einer Anlage nach einem der Ansprüche 1 bis 10.Inclined wire former (10) of a plant according to one of Claims 1 to 10. Verfahren zur Herstellung einer fluidstrahlvernadelten Faserstoffbahn (20) aus mindestens einer Faserstoffsuspension (11), bei welchem die Faserstoffsuspension (11) unter Bildung eines Faserflors (13) auf ein Siebband (14) eines Schrägsiebformers (10), welches in einer Umlaufrichtung eine Siebsaugwalze (35) umläuft, aufgebracht wird, die Faserstoffsuspension beim Umlauf um die Siebsaugwalze (35) mit Fluidstrahlen beaufschlagt wird, und Fluid mittels der Siebsaugwalze (35) abgesaugt wird.Method for producing a fluid-jet needled fibrous web (20) from at least one fibrous suspension (11), in which the fibrous suspension (11) is placed on a wire (14) of an inclined wire former (10), forming a fibrous web (13), which has a wire suction roll ( 35); Verfahren nach Anspruch 13, dadurch gekennzeichnet, dass Fluid mittels mindestens einer mit einem Unterdruck beaufschlagbaren Saugkammer (40, 41) abgesaugt wird.Method according to Claim 13, characterized in that fluid is sucked off by means of at least one suction chamber (40, 41) which can be subjected to a negative pressure.
EP22170735.9A 2021-05-04 2022-04-29 Apparatus and method for producing a fluid jet needled fibrous web from at least one fibrous suspension Pending EP4086388A1 (en)

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DE19803451A1 (en) * 1998-01-30 1999-08-05 Voith Sulzer Papiertech Patent Fourdrinier section of a paper and cardboard production machine
DE102006042507A1 (en) * 2006-09-07 2008-03-27 Andritz Küsters GmbH & Co. KG Treatment method for non-woven webs comprises treating them with liquid and then squeezing it out using rollers with wide nip
DE102016217401A1 (en) * 2016-09-13 2017-10-26 TRüTZSCHLER GMBH & CO. KG Method and device for producing a wet laid nonwoven fabric

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