EP3250750B1 - Method and device for producing wet-laid non-woven fabrics - Google Patents

Method and device for producing wet-laid non-woven fabrics Download PDF

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Publication number
EP3250750B1
EP3250750B1 EP16702877.8A EP16702877A EP3250750B1 EP 3250750 B1 EP3250750 B1 EP 3250750B1 EP 16702877 A EP16702877 A EP 16702877A EP 3250750 B1 EP3250750 B1 EP 3250750B1
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Prior art keywords
installation
treatment unit
subsequent treatment
transfer
wire
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German (de)
French (fr)
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EP3250750A1 (en
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Dennis Latendorf
Andreas Pesch
Florian Diederich
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Andritz Kuesters GmbH
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Andritz Kuesters GmbH
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F2/00—Transferring continuous webs from wet ends to press sections
    • 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
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
    • D04H1/732—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged by fluid current, e.g. air-lay
    • 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
    • D21F1/48—Suction apparatus
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0063—Devices for threading a web tail through a paper-making machine

Definitions

  • the invention relates to a method and a device for producing wet laid nonwovens according to the preamble of claim 1 or 8.
  • the closed decrease with the aid of a pick-up felt requires good adhesion of the nonwoven web during its run on the felt underside.
  • the pick-up felt must have a sufficient moisture content.
  • experience shows that the nonwoven web must contain a considerable proportion of pulp and have a paper-like character, because otherwise the adhesion is inadequate even if the pick-up felt has sufficient moisture, so that the nonwoven web is released from the pick-up felt and causes malfunctions.
  • Another approach to this end is to avoid free trains by making compromises in the arrangement of the machine components, e.g. one above the other.
  • water is used to form fibers into a fabric or wet fleece.
  • the fibers are passed through a sieve in the water. While the water is being sucked through the sieve, the fibers are deposited on the sieve. This process step is called sheet formation.
  • the nonwoven still contains significantly more water than fibers after sheet formation.
  • About vacuum suction water is further removed from the nonwoven, but the substance at the interface to the screen, the Usually formed by a Schrägsiebformer, not a stable product, but a loose composite of fibers.
  • WO2015 / 000687A1 discloses a method for producing a wet-laid nonwoven web according to the preamble of present claim 1.
  • the object of the present invention the object of providing a method and apparatus for producing wet nonwovens to improve the web performance at the start of production and / or after a production interruption.
  • the temporarily closed trains offer the possibility of permitting, on the one hand, free traction between the treatment units / machine components and, on the other hand, assigning the temporarily closed trains to an automated solution so that the nonwoven web can be listed at higher machine speeds.
  • the wet nonwoven fabrics produced on a screening device especially when long fibers are used, they have a sufficient strength to be replaced with compressed air from the screen of the screening device.
  • a web-laying device at the interfaces between the screening device and a subsequent treatment unit or at interfaces between two adjacent treatment units, which is designed as a temporarily closed train. Detected from the temporarily closed draw is a final leader of the nonwoven web which is cut from the moving web on the downstream side of a wire of the screening device. This strip is transferred with air flows of the temporarily closed train to the respective subsequent treatment unit.
  • the cut Endauf arrangementsband is lifted off the screen to be transferred, for example by compressed air to a transport device. From the subsequent treatment unit, this band is caught using an air flow, so that the created transfer of the Endauf arrangementssbandes represents a temporarily closed train.
  • Essential here is a preferably controlled withdrawal, transfer and the following controlled recording.
  • the invention relates to a method and an apparatus for the production of wet laid nonwovens.
  • An example provided for wet-laid plant 1 is in Fig. 1a and Fig. 1b shown.
  • a fiber suspension device 2 Thereafter, arranged in series are a fiber suspension device 2, a screening device 3, at least one subsequent treatment unit 4 and optionally a rewinder 5.
  • a fiber suspension device 2 In the case of Fig. 1a and Fig. 1b shown wet-laid plant 1 is provided as at least one treatment unit 4 a Wasserstrahlverest Trents Rhein.
  • further treatment units 6, 7 are provided.
  • the treatment unit 6 is for example a drying screen and the treatment unit 7 is for example a dryer.
  • the screening device 3 is shown as Schrägsiebformer. Alternative embodiments of the screening device 3 can be used. Between the screening device 3 and the subsequent treatment unit 4, an interface 8 is provided. For example, an interface 9 is provided between the treatment unit 4 and the treatment unit 6. Both interfaces 8, 9 are formed as free trains when the nonwoven web 10 is listed.
  • the inventive method for the production of wet-laid nonwovens provides that an aqueous suspension is deposited with fibers on a wire 11 of the screening device 3 and dewatered by suction boxes 12 under the wire for sheet formation of a nonwoven web 10, which is removed from the screen 11 and at least one subsequent treatment unit 4 is supplied before the nonwoven web 10 is finally wound on a roll 23.
  • the nonwoven web is transferred from the wire 11 to the at least one subsequent treatment unit 4 and / or at an interface 9 between two treatment units 4, 6 at a production start and / or after a production interruption with the aid of a web presentation 13.
  • the respective temporarily closed train of a Bruauf arrangement 13 is generated by air currents. These flows of air act on an end band 14 which is cut by a cutter 16 which acts on the nonwoven web 10 downstream of the screen 11. By means of the cutting device 16, the Endiller operationssband 14 is separated from the residual web 15 of the nonwoven web 10. By means of the Endauf operationssbandes 14 the Bruauf operation takes place while the residual web 15 falls into a pulper 17.
  • the Endiller arrangementsband 14 is lifted as part of the running nonwoven web 10 by blowing by means of a compressed air device 18 from the screen 11.
  • a compressed air device 18 By generating negative pressure at a transport path 19, the Endiller operationsband 14 is attached to a transport path formed by the transport path 19 and received by suction on the respective subsequent treatment unit 4.
  • the suction on the subsequent treatment unit 4 for example, by means of a Saugfang liked 21st
  • wet nonwoven products have sufficient strength when they have been dewatered on a screening device 3, which is designed, for example, as a skew screening machine. This is especially true when long fibers are used for nonwoven web production. Due to this generated strength of the nonwoven web through the screening device 3, the screen web can be released with compressed air from the compressed air device 18 from the screen 11 for a web performance. The lifted off the screen 11 Endauf operationsband 14 has sufficient stability to be transferred by compressed air to the transport path 19 device.
  • the transport path 19 is in Fig. 2 shown as air guide device. In Fig. 3 the transport path 19 is designed as a suction conveyor belt. Both transport pathways 19 of the Fig. 2 and the Fig.
  • the treatment unit 4 for example, a hydroentanglement.
  • the final leader 14 can be further stabilized by such hydroentanglement.
  • the transfer of the Endauf holderssbandes can be lifted again with compressed air from the wire 20 of the treatment unit 4 and transferred with a vacuum generating conveyor 19 on a next wire 22 of a subsequent treatment unit 6 on the same principle.
  • the Endauf operationsband 14 After the screen belt 22 such a vacuum dewatering the Endauf operationsband 14 is usually sufficiently stable to be inserted into a rope scissors. The lifting can in turn be done with compressed air through the wire. The Endauf operationsband 14 can be caught by a baffle plate or another screen belt and transferred to a rope scissors. The described transfer of the Endauf operationssbandes 14 with the temporarily closed train can be easily performed at production speeds between 200 to 250 m / min and higher.
  • the nonwoven web 10 can be driven on the screening device 3 to the complete fabric width.
  • the wet fleece is sufficiently stable to be guided over the entire fabric width directly after the screening device 3 via a free train to the next treatment unit.
  • the nonwoven web can be converted economically more favorably compared to conventional solutions, and the controlled free train moreover offers an economically favorable solution for web guide.
  • the aforesaid slack control can be supplemented by a control device for controlling the lifting, transfer and picking up of an end slack band 14 at the interfaces 8, 9 with a web track 13.

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

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Herstellung von nassgelegten Vliesstoffen nach dem Oberbegriff des Anspruchs 1 bzw. 8.The invention relates to a method and a device for producing wet laid nonwovens according to the preamble of claim 1 or 8.

Aus DE 24 37 611 A1 ist bekannt, dass bei Verfahren und Vorrichtungen zur Herstellung von Nassvliesen das auf dem Sieb gebildete Vlies entweder nach der Abnahme vom Sieb in freiem Zug zum nachfolgenden Aggregat geführt oder bei der so genannten geschlossenen Abnahme mit einer filzumschlungenen Walze vom Sieb abgenommen wird, wonach die Bahn an der Unterseite dieses Pick-up-Filzes zum nachfolgenden Aggregat überführt wird.Out DE 24 37 611 A1 It is known that in processes and apparatus for the production of wet nonwovens, the nonwoven fabric formed on the screen either after removal from the screen in free train to the subsequent unit or removed in the so-called closed acceptance with a filzumschlungenen roller from the screen, after which the web at the bottom of this pick-up felt is transferred to the subsequent unit.

Beide Abnahmearten haben Nachteile. Die Überführung des Vlieses in freiem Zug zum nachfolgenden Bearbeitungsaggregat oder auf ein Transportband hat den Nachteil, dass die Vliesbahn eine erhebliche initiale Nassfestigkeit aufweisen muss, um die Abnahme vom Siebtuch und die freie Überführung bis zum nachfolgenden Aggregat ohne Abriss zu überstehen. Selbst wenn die Bahn nicht reißt, ist die Bahn bei der Abnahme vom Sieb als Folge ihrer Haftung an dem Siebtuch beträchtlichen Zugspannungen ausgesetzt, wodurch es zu einer Dehnungsbeanspruchung kommt, welche durch Veränderung der Geschwindigkeit der nachfolgenden Aggregate ausgeglichen werden muss.Both types of acceptance have disadvantages. The transfer of the web in free train to the subsequent processing unit or on a conveyor belt has the disadvantage that the nonwoven web must have a significant initial wet strength to survive the decrease of the sieve cloth and the free transfer to the subsequent unit without demolition. Even if the train does not tear, the train is Upon removal from the wire, as a result of its adhesion to the wire cloth, it is subjected to considerable tensile stress, which results in a strain which must be compensated for by changing the speed of the following aggregates.

Die geschlossene Abnahme unter Zuhilfenahme eines Pick-up-Filzes setzt eine gute Haftung der Vliesbahn während ihres Laufes an der Filzunterseite voraus. Dazu muss der Pick-up-Filz einen ausreichenden Feuchtigkeitsgehalt aufweisen. Außerdem muss erfahrungsgemäß die Vliesbahn einen erheblichen Zellstoffanteil enthalten und einen papierähnlichen Charakter besitzen, weil sonst selbst bei ausreichender Feuchtigkeit des Pick-up-Filzes die Haftung mangelhaft ist, so dass sich die Vliesbahn von dem Pick-up-Filz löst und Betriebsstörungen verursacht.The closed decrease with the aid of a pick-up felt requires good adhesion of the nonwoven web during its run on the felt underside. For this purpose, the pick-up felt must have a sufficient moisture content. In addition, experience shows that the nonwoven web must contain a considerable proportion of pulp and have a paper-like character, because otherwise the adhesion is inadequate even if the pick-up felt has sufficient moisture, so that the nonwoven web is released from the pick-up felt and causes malfunctions.

Um diese Nachteile zu vermeiden, ist gemäß DE 24 37 611 A1 vorgesehen, dass die in einem Suspensionssumpf auf einem Schrägsieb niedergelegte und durch Saugkästen unter dem Sieb entwässerte Vliesbahn von diesem Sieb unter Ausschaltung von Zwischenelementen direkt auf eine unterhalb des Siebs befindliche Trocknerfläche aufläuft. Nicht geeignet ist eine solche Lösung allerdings, wenn die Vliesbahn vor der Trocknung mittels beispielsweise einer Wasserstrahlverfestigung oder mittels eines Bindemittelsauftrags verfestigt werden soll.To avoid these disadvantages is according to DE 24 37 611 A1 provided that the nonwoven web laid down in a suspension sump on a diagonal sieve and dewatered by suction boxes under the sieve runs directly from this sieve, with the elimination of intermediate elements, onto a dryer surface located below the sieve. However, such a solution is not suitable if the nonwoven web is to be solidified before drying by, for example, a hydroentanglement or by means of a binder application.

Ein weiterer Lösungsansatz insoweit ist die Vermeidung freier Züge durch Kompromisse in der Anordnung der Maschinenkomponenten z.B. übereinander.Another approach to this end is to avoid free trains by making compromises in the arrangement of the machine components, e.g. one above the other.

Bei der Nassvliesproduktion wird Wasser genutzt, um Fasern zu einem Flächengebilde bzw. Nassvlies zu formen. Dabei werden die Fasern im Wasser über ein Sieb geführt. Während das Wasser durch das Sieb abgesaugt wird, werden die Fasern auf dem Sieb abgelegt. Diese Prozessstufe wird Blattbildung genannt. Je nach Art der Faser beinhaltet der Vliesstoff nach der Blattbildung immer noch deutlich mehr Wasser als Fasern. Über Vakuumsauger wird dem Vliesstoff weiter Wasser entzogen, dennoch ist der Stoff an der Schnittstelle nach dem Sieb, das üblicherweise durch einen Schrägsiebformer gebildet wird, kein stabiles Produkt, sondern ein loser Verbund von Fasern.In wet-laid fabric production, water is used to form fibers into a fabric or wet fleece. The fibers are passed through a sieve in the water. While the water is being sucked through the sieve, the fibers are deposited on the sieve. This process step is called sheet formation. Depending on the type of fiber, the nonwoven still contains significantly more water than fibers after sheet formation. About vacuum suction water is further removed from the nonwoven, but the substance at the interface to the screen, the Usually formed by a Schrägsiebformer, not a stable product, but a loose composite of fibers.

Aus den dargelegten Gründen ist es deshalb vorteilhaft, bei voller Geschwindigkeit des Formers zu beginnen. Nur wenn der Former bei voller Produktionsgeschwindigkeit arbeitet, kann die erforderliche Stoffkonsistenz erzeugt werden, um einen Faserverbund herzustellen, der eine ausreichende innere Festigkeit hat, um auf das nächste Förderband bzw. auf das nächste Behandlungsaggregat bzw. die nächste Maschinenkomponente überführt zu werden. Bei niedrigen Produktionsgeschwindigkeiten waren, wie bereits vorstehend ausgeführt, freie Züge zwischen den Behandlungsaggregaten üblich. Mit der Steigerung der Produktionsgeschwindigkeiten sind diese aus Sicherheitsgründen insbesondere für die Bahnaufführung nicht mehr möglich.For the reasons set forth, it is therefore advantageous to start at full speed of the former. Only when the former is operating at full production speed can the required stock consistency be created to produce a fiber composite that has sufficient internal strength to be transferred to the next conveyor belt or to the next processing unit or machine component. At low production speeds, as stated above, free trains between the treatment units were common. With the increase in production speeds these are no longer possible for safety reasons, especially for the web performance.

WO2015/000687A1 offenbart ein Verfahren zur Herstellung einer nassgelegten Vliesstoffbahn gemäß dem Oberbegriff des vorliegenden Anspruchs 1. WO2015 / 000687A1 discloses a method for producing a wet-laid nonwoven web according to the preamble of present claim 1.

Ausgehend von diesem Stand der Technik liegt dem Gegenstand der vorliegenden Erfindung die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zur Herstellung von Nassvliesen zu schaffen, die die Bahnaufführung bei Produktionsbeginn und/oder nach einer Produktionsunterbrechung verbessern.Based on this prior art, the object of the present invention, the object of providing a method and apparatus for producing wet nonwovens to improve the web performance at the start of production and / or after a production interruption.

Diese Aufgabe wird durch die Merkmale der Ansprüche 1 bzw. 8 gelöst.This object is solved by the features of claims 1 and 8, respectively.

Hierdurch wird erreicht, dass zur Herstellung von nassgelegten Vliesstoffen unter Verwendung einer Siebeinrichtung die erforderlichen Behandlungsaggregate/ Maschinenkomponenten in bekannter Weise der Reihe nach angeordnet werden können. Zwischen der Siebeinrichtung und dem mindestens einen nachfolgenden Behandlungsaggregat sind freie Züge vorgesehen. Dies ist vorteilhaft insbesondere dann, wenn alle Behandlungsaggregate/Maschinenkomponenten für eine wirtschaftliche und energetisch optimierte Arbeitsweise mit unterschiedlichen Siebbändern ausgestattet werden sollen. Dies ist beispielsweise insbesondere dann der Fall, wenn die Herstellung eines nassgelegten Vliesstoffes einen Schrägsiebformer, eine Wasserstrahlverfestigungseinrichtung und ein Entwässerungsband umfasst. Die sich zwischen diesen Behandlungsaggregaten ergebenden Schnittstellen sollen sich möglichst gegenseitig nicht beeinträchtigen, so dass insoweit freie Züge vorteilhaft sind.This ensures that the required treatment units / machine components can be arranged in a known manner in order to produce wet laid nonwovens using a sieve. Between the screening device and the at least one subsequent treatment unit free trains are provided. This is advantageous, in particular, if all treatment units / machine components are to be equipped with different screen belts for economical and energy-optimized operation. This is particularly the case, for example, when the production of a wet-laid nonwoven fabric comprises a Schrägsiebformer, a Wasserstrahlverfestigungseinrichtung and a drainage tape. Which Interfaces resulting between these treatment units should as far as possible not interfere with each other, so that insofar free traits are advantageous.

Für moderne Schrägsiebanlagen werden einerseits hohe Produktionsgeschwindigkeiten gefordert, andererseits bestehen Sicherheitsrichtlinien, die das Eingreifen der Operator in die Maschine untersagen. Da auf Schrägsiebproduktionslinien das Produkt bei voller Produktionsgeschwindigkeit aufgeführt wird, ist dafür erfindungsgemäß eine automatisierte Lösung möglich.On the one hand, modern production lines require high production speeds, on the other hand there are safety guidelines that prohibit the intervention of the operator in the machine. Since the product is listed at full production speed on skew-screen production lines, an automated solution is possible according to the invention for this purpose.

Erfindungsgemäß bieten die temporär geschlossenen Züge die Möglichkeit, zum einen freie Züge zwischen den Behandlungsaggregaten/Maschinenkomponenten zuzulassen und zum anderen die temporär geschlossenen Züge einer automatisierten Lösung zuzuordnen, damit die Vliesstoffbahn bei höheren Maschinengeschwindigkeiten aufgeführt werden kann.In accordance with the invention, the temporarily closed trains offer the possibility of permitting, on the one hand, free traction between the treatment units / machine components and, on the other hand, assigning the temporarily closed trains to an automated solution so that the nonwoven web can be listed at higher machine speeds.

Vorteilhaft wird genutzt, dass die auf einer Siebvorrichtung erzeugten Nassvliesstoffe insbesondere dann, wenn lange Fasern verwendet werden, diese eine hinreichende Festigkeit besitzen, um mit Druckluft vom Sieb der Siebvorrichtung abgelöst zu werden.Advantageously, it is used that the wet nonwoven fabrics produced on a screening device, especially when long fibers are used, they have a sufficient strength to be replaced with compressed air from the screen of the screening device.

Erfindungsgemäß ist deshalb vorgesehen, an den Schnittstellen zwischen der Siebeinrichtung und einem nachfolgenden Behandlungsaggregat bzw. an Schnittstellen zwischen zwei benachbarten Behandlungsaggregaten eine Bahnaufführungseinrichtung vorzusehen, die als temporär geschlossener Zug ausgebildet ist. Erfasst von dem temporär geschlossenen Zug wird ein Endaufführungsband der Vliesbahn, das auslaufseitig eines Siebbandes der Siebeinrichtung von der laufenden Bahn geschnitten wird. Dieser Streifen wird mit Luftströmungen des temporär geschlossenen Zuges auf das jeweils nachfolgende Behandlungsaggregat übertragen. Gleiches gilt für die Schnittstellen zwischen jeweils zwei benachbarten Behandlungsaggregaten, z.B. zwischen dem Siebband einer Wasserstrahlverfestigung und einem nachgeordneten Entwässerungsband.According to the invention, it is therefore provided to provide a web-laying device at the interfaces between the screening device and a subsequent treatment unit or at interfaces between two adjacent treatment units, which is designed as a temporarily closed train. Detected from the temporarily closed draw is a final leader of the nonwoven web which is cut from the moving web on the downstream side of a wire of the screening device. This strip is transferred with air flows of the temporarily closed train to the respective subsequent treatment unit. The same applies to the interfaces between two adjacent ones Treatment units, for example, between the wire belt of a hydroentanglement and a downstream dewatering belt.

Weiterhin ist vorgesehen, dass das geschnittene Endaufführungsband vom Sieb abgehoben wird, um beispielsweise per Druckluft an eine Transporteinrichtung übergeben zu werden. Von dem nachfolgenden Behandlungsaggregat wird dieses Band unter Einsatz einer Luftströmung gefangen, so dass die geschaffene Überführung des Endaufführungsbandes einen temporär geschlossenen Zug darstellt. Wesentlich dabei ist eine vorzugsweise kontrollierte Abhebung, Überführung und die dann folgende kontrollierte Aufnahme.Furthermore, it is provided that the cut Endaufführungsband is lifted off the screen to be transferred, for example by compressed air to a transport device. From the subsequent treatment unit, this band is caught using an air flow, so that the created transfer of the Endaufführungsbandes represents a temporarily closed train. Essential here is a preferably controlled withdrawal, transfer and the following controlled recording.

Weitere Ausgestaltungen der Erfindung sind der nachfolgenden Beschreibung und den Unteransprüchen zu entnehmen.Further embodiments of the invention are described in the following description and the dependent claims.

Die Erfindung wird nachstehend anhand des in den beigefügten Abbildungen dargestellten Ausführungsbeispiels näher erläutert.

  • Fig. 1a zeigt schematisch eine Seitenansicht einer Nassvliesanlage mit freier Suspensionseinrichtung, Siebeinrichtung, Wasserstrahlverfestigungseinrichtung und Entwässerungsband,
  • Fig. 1b zeigt schematisch die Endpartien einer Nassvliesanlage mit Trockner und Wickler,
  • Fig. 2 zeigt vergrößert und schematisch ein Ausführungsbeispiel einer Bahnaufführung für die Schnittstellen X, Y gemäß Fig. 1a,
  • Fig. 3 zeigt ein zweites Ausführungsbeispiel einer Bahnaufführung für die Schnittstellen X, Y gemäß Fig. 1a,
  • Fig. 4 zeigt schematisch eine Draufsicht des auslaufseitigen Endbereichs der Siebeinrichtung im Bereich der Schnittstelle X gemäß Fig. 1a.
The invention will be explained in more detail with reference to the embodiment shown in the accompanying drawings.
  • Fig. 1a shows schematically a side view of a wet web plant with free suspension device, screening device, hydroentanglement device and dewatering belt,
  • Fig. 1b schematically shows the end parts of a wet mat installation with dryer and winder,
  • Fig. 2 shows enlarged and schematically an embodiment of a track performance for the interfaces X, Y according to Fig. 1a .
  • Fig. 3 shows a second embodiment of a Bahnaufführung for the interfaces X, Y according to Fig. 1a .
  • Fig. 4 schematically shows a plan view of the outlet end portion of the screening device in the region of the interface X according to Fig. 1a ,

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Herstellung von nassgelegten Vliesstoffen. Eine beispielhaft dafür vorgesehene Nassvliesanlage 1 ist in Fig. 1a und Fig. 1b dargestellt.The invention relates to a method and an apparatus for the production of wet laid nonwovens. An example provided for wet-laid plant 1 is in Fig. 1a and Fig. 1b shown.

Danach sind in Reihe angeordnet eine Fasersuspensierungseinrichtung 2, eine Siebeinrichtung 3, mindestens ein nachfolgendes Behandlungsaggregat 4 und gegebenenfalls ein Aufwickler 5. Bei der in Fig. 1a und Fig. 1b dargestellten Nassvliesanlage 1 ist als mindestens ein Behandlungsaggregat 4 eine Wasserstrahlverfestigungseinrichtung vorgesehen. Ferner sind weitere Behandlungsaggregate 6, 7 vorgesehen. Das Behandlungsaggregat 6 ist beispielsweise ein Trocknungssieb und das Behandlungsaggregat 7 ist beispielsweise ein Trockner.Thereafter, arranged in series are a fiber suspension device 2, a screening device 3, at least one subsequent treatment unit 4 and optionally a rewinder 5. In the case of Fig. 1a and Fig. 1b shown wet-laid plant 1 is provided as at least one treatment unit 4 a Wasserstrahlverestigungseinrichtung. Furthermore, further treatment units 6, 7 are provided. The treatment unit 6 is for example a drying screen and the treatment unit 7 is for example a dryer.

Die Siebeinrichtung 3 ist als Schrägsiebformer dargestellt. Alternative Ausbildungen der Siebeinrichtung 3 sind verwendbar. Zwischen der Siebvorrichtung 3 und dem nachfolgenden Behandlungsaggregat 4 ist eine Schnittstelle 8 vorgesehen. Zwischen dem Behandlungsaggregat 4 und dem Behandlungsaggregat 6 ist beispielsweise eine Schnittstelle 9 vorgesehen. Beide Schnittstellen 8, 9 sind als freie Züge ausgebildet dann, wenn die Vliesbahn 10 aufgeführt ist.The screening device 3 is shown as Schrägsiebformer. Alternative embodiments of the screening device 3 can be used. Between the screening device 3 and the subsequent treatment unit 4, an interface 8 is provided. For example, an interface 9 is provided between the treatment unit 4 and the treatment unit 6. Both interfaces 8, 9 are formed as free trains when the nonwoven web 10 is listed.

Bei einem Produktionsanlauf oder nach einer Produktionsunterbrechung bedarf es einer Aufführung der Vliesbahn 10, um den Abstand im Bereich der Schnittstellen 8, 9 zu überwinden.In a production start or after a production interruption, it is necessary to perform the nonwoven web 10 in order to overcome the distance in the region of the interfaces 8, 9.

Erfindungsgemäß wurde festgestellt, dass mit Nassvliesprodukten auf einer Schrägsiebmaschine, wie sie als Siebeinrichtung 3 in Fig. 1a beispielhaft dargestellt ist, die erzeugte Vliesbahn 10 eine ausreichende Festigkeit besitzt, damit das Material durch Abblasen von dem Sieb 11 abgehoben wird. Verdeutlicht ist dies in den Fig. 2 und Fig. 3 in Verbindung mit Fig. 4.According to the invention, it has been found that with wet nonwoven products on a skew screening machine, as used in sieve means 3 in FIG Fig. 1a is exemplified, the produced nonwoven web 10 has sufficient strength, so that the material is lifted by blowing off the wire 11. This is illustrated in the Fig. 2 and Fig. 3 combined with Fig. 4 ,

Das erfindungsgemäße Verfahren zur Herstellung von nassgelegten Vliesstoffen sieht vor, dass eine wässrige Suspension mit Fasern auf einem Sieb 11 der Siebeinrichtung 3 abgelegt und durch Saugkästen 12 unter dem Sieb entwässert wird für eine Blattbildung einer Vliesbahn 10, die vom Sieb 11 abgenommen und zumindest einem nachfolgenden Behandlungsaggregat 4 zugeführt wird, bevor die Vliesbahn 10 abschließend auf eine Rolle 23 aufwickelbar ist.The inventive method for the production of wet-laid nonwovens provides that an aqueous suspension is deposited with fibers on a wire 11 of the screening device 3 and dewatered by suction boxes 12 under the wire for sheet formation of a nonwoven web 10, which is removed from the screen 11 and at least one subsequent treatment unit 4 is supplied before the nonwoven web 10 is finally wound on a roll 23.

Die Vliesbahn wird von dem Sieb 11 zu dem mindestens einen nachfolgenden Behandlungsaggregat 4 und/oder an einer Schnittstelle 9 zwischen zwei Behandlungsaggregaten 4, 6 überführt bei einem Produktionsstart und/oder nach einer Produktionsunterbrechung unter Zuhilfenahme einer Bahnaufführung 13.The nonwoven web is transferred from the wire 11 to the at least one subsequent treatment unit 4 and / or at an interface 9 between two treatment units 4, 6 at a production start and / or after a production interruption with the aid of a web presentation 13.

Bezug nehmend auf die Fig. 2 bis Fig. 4 erfolgt die Bahnaufführung 13 über einen jeweils temporär geschlossenen Zug eines an sich freien Zuges zwischen Sieb 11 und dem mindestens einen nachfolgenden Behandlungsaggregat 4 und/oder eines freien Zuges an einer Schnittstelle 9 zwischen Behandlungsaggregaten 4, 6.Referring to the Fig. 2 to Fig. 4 the Bahnaufführung 13 via a respective temporarily closed train of a per se free train between sieve 11 and the at least one subsequent treatment unit 4 and / or a free train at an interface 9 between treatment units 4, 6th

Der jeweils temporär geschlossene Zug einer Bahnaufführung 13 wird über Luftströmungen erzeugt. Diese Luftströmungen wirken ein auf ein Endaufführungsband 14, das geschnitten wird mittels einer Schneideinrichtung 16, die auf die Vliesbahn 10 auslaufseitig des Siebes 11 einwirkt. Mittels der Schneideinrichtung 16 wird das Endaufführungsband 14 von der Restbahn 15 der Vliesbahn 10 abgetrennt. Mittels des Endaufführungsbandes 14 erfolgt die Bahnaufführung, während die Restbahn 15 in einen Pulper 17 fällt.The respective temporarily closed train of a Bahnaufführung 13 is generated by air currents. These flows of air act on an end band 14 which is cut by a cutter 16 which acts on the nonwoven web 10 downstream of the screen 11. By means of the cutting device 16, the Endaufführungsband 14 is separated from the residual web 15 of the nonwoven web 10. By means of the Endaufführungsbandes 14 the Bahnaufführung takes place while the residual web 15 falls into a pulper 17.

Erfindungsgemäß wird das Endaufführungsband 14 als Teil der laufenden Vliesbahn 10 durch Anblasen mittels einer Drucklufteinrichtung 18 vom Sieb 11 abgehoben. Durch Unterdruckerzeugung an einer Transportwegeinrichtung 19 wird das Endaufführungsband 14 an einen von der Transportwegeinrichtung 19 gebildeten Transportweg angeheftet und durch Ansaugen an dem jeweils nachfolgenden Behandlungsaggregat 4 aufgenommen. Das Ansaugen an dem nachfolgenden Behandlungsaggregat 4 erfolgt beispielsweise mittels einer Saugfangeinrichtung 21.According to the invention the Endaufführungsband 14 is lifted as part of the running nonwoven web 10 by blowing by means of a compressed air device 18 from the screen 11. By generating negative pressure at a transport path 19, the Endaufführungsband 14 is attached to a transport path formed by the transport path 19 and received by suction on the respective subsequent treatment unit 4. The suction on the subsequent treatment unit 4, for example, by means of a Saugfangeinrichtung 21st

Die vorstehenden Ausführungen zur Bahnaufführung 13 an der Schnittstelle 8 gelten in gleicher Weise für die Bahnaufführung 13 an der Schnittstelle 9.The above remarks on web presentation 13 at interface 8 apply in the same way to web presentation 13 at interface 9.

Erfindungsgemäß wurde festgestellt, dass Nassvliesprodukte eine hinreichende Festigkeit besitzen dann, wenn sie auf einer Siebeinrichtung 3 entwässert wurden, die beispielsweise als Schrägsiebmaschine ausgebildet ist. Dies gilt insbesondere auch dann, wenn zur Vliesbahnherstellung lange Fasern verwendet werden. Aufgrund dieser erzeugten Festigkeit der Vliesbahn durch die Siebeinrichtung 3 kann die Siebbahn mit Druckluft aus der Drucklufteinrichtung 18 vom Sieb 11 für eine Bahnaufführung gelöst werden. Das vom Sieb 11 abgehobene Endaufführungsband 14 besitzt ausreichende Stabilität, um per Druckluft an die Transportwegeinrichtung 19 übergeben zu werden. Die Transportwegeinrichtung 19 ist in Fig. 2 als Luftleitblecheinrichtung dargestellt. In Fig. 3 ist die Transportwegeinrichtung 19 als Saugförderband ausgebildet. Beide Transportwegeinrichtungen 19 der Fig. 2 und der Fig. 3 bilden einen Unterdruck aufgrund der vorhandenen Luftströmungen an vorzugsweise der Unterseite der Transportwegeinrichtung 19 aus. Dadurch ist es möglich, dass das über die Druckluft der Drucklufteinrichtung 18 abgehobene Endaufführungsband 14 geführt bewegt wird zum nachfolgenden Behandlungsaggregat 4. Auf einem Siebband 20 des nachfolgenden Behandlungsaggregats 4 wird das Endaufführungsband 14 durch die Saugfangeinrichtung 21 aufgenommen.According to the invention, it has been found that wet nonwoven products have sufficient strength when they have been dewatered on a screening device 3, which is designed, for example, as a skew screening machine. This is especially true when long fibers are used for nonwoven web production. Due to this generated strength of the nonwoven web through the screening device 3, the screen web can be released with compressed air from the compressed air device 18 from the screen 11 for a web performance. The lifted off the screen 11 Endaufführungsband 14 has sufficient stability to be transferred by compressed air to the transport path 19 device. The transport path 19 is in Fig. 2 shown as air guide device. In Fig. 3 the transport path 19 is designed as a suction conveyor belt. Both transport pathways 19 of the Fig. 2 and the Fig. 3 form a negative pressure due to the existing air currents at preferably the bottom of the transport path 19 from. As a result, it is possible for the final lead-in belt 14 lifted off via the compressed air of the compressed air device 18 to be moved to the subsequent treatment unit 4. The end lead-in belt 14 is received by the suction catch device 21 on a screen belt 20 of the subsequent treatment unit 4.

Die so geschaffene Überführung des Endaufführungsbandes 14 stellt einen temporär geschlossenen Zug dar. Wesentlich ist insoweit, dass durch die erfindungsgemäße Ausbildung eine kontrollierte Abhebung, Überführung und die dann folgende kontrollierte Aufnahme möglich ist.The thus created transfer of the Endaufführungsbandes 14 represents a temporarily closed train. It is essential to the extent that a controlled withdrawal, transfer and then the following controlled recording is possible by the inventive design.

Wie in Fig. 1a dargestellt, ist das Behandlungsaggregat 4 beispielsweise eine Wasserstrahlverfestigung. Das Endaufführungsband 14 kann durch eine solche Wasserstrahlverfestigung weiter stabilisiert werden. Am freien Zug nach dieser Wasserstrahlverfestigung der Schnittstelle 9 kann die Überführung des Endaufführungsbandes wiederum mit Druckluft vom Siebband 20 des Behandlungsaggregats 4 abgehoben werden und mit einer Unterdruck erzeugenden Transporteinrichtung 19 auf ein nächstes Siebband 22 eines nachfolgenden Behandlungsaggregats 6 nach dem gleichen Prinzip übergeben werden. Gemäß Fig. 1a ist dieses weitere Behandlungsaggregat 6 beispielsweise eine Vakuumentwässerung.As in Fig. 1a illustrated, the treatment unit 4, for example, a hydroentanglement. The final leader 14 can be further stabilized by such hydroentanglement. At the free train after this hydroentanglement of the interface 9, the transfer of the Endaufführungsbandes can be lifted again with compressed air from the wire 20 of the treatment unit 4 and transferred with a vacuum generating conveyor 19 on a next wire 22 of a subsequent treatment unit 6 on the same principle. According to FIG. 1a is this further treatment unit 6, for example, a vacuum dewatering.

Nach dem Siebband 22 einer solchen Vakuumentwässerung ist das Endaufführungsband 14 meist ausreichend stabil, um in eine Seilschere eingeführt zu werden. Die Abhebung kann wiederum mit Druckluft durch das Siebband erfolgen. Das Endaufführungsband 14 kann durch ein Luftleitblech oder ein weiteres Siebband gefangen und in eine Seilschere übergeben werden. Die beschriebene Überführung des Endaufführungsbandes 14 mit dem temporär geschlossenen Zug kann problemlos bei Produktionsgeschwindigkeiten zwischen 200 bis 250 m/min und höher durchgeführt werden.After the screen belt 22 such a vacuum dewatering the Endaufführungsband 14 is usually sufficiently stable to be inserted into a rope scissors. The lifting can in turn be done with compressed air through the wire. The Endaufführungsband 14 can be caught by a baffle plate or another screen belt and transferred to a rope scissors. The described transfer of the Endaufführungsbandes 14 with the temporarily closed train can be easily performed at production speeds between 200 to 250 m / min and higher.

Nachdem das Endaufführungsband 14 durch den Trockner, beispielsweise Behandlungsaggregat 7, und eine Qualitätssicherung 25 bis zum Aufwickler 5 geführt worden ist, kann die Vliesbahn 10 auf der Siebeinrichtung 3 auf die komplette Warenbreite breitgefahren werden. Dabei ist das Nassvlies ausreichend stabil, um auch über die gesamte Warenbreite direkt nach der Siebeinrichtung 3 über einen freien Zug auf das nächste Behandlungsaggregat geführt zu werden.After the Endaufführungsband 14 has been passed through the dryer, such as treatment unit 7, and a quality assurance 25 to the winder 5, the nonwoven web 10 can be driven on the screening device 3 to the complete fabric width. The wet fleece is sufficiently stable to be guided over the entire fabric width directly after the screening device 3 via a free train to the next treatment unit.

Bei den eben erwähnten Produktionsgeschwindigkeiten könnte eine Veränderung in der Abhebung der Vliesbahn schnell zu Bahnabrissen führen. Daher ist vorzugsweise unter dem Siebband 11 der Siebeinrichtung 3 ein variabler, entlang des Siebbandes 11 verschiebbarer Vakuumsaugkasten 26 montiert. Nachdem die Vliesbahn in voller Breite auf der Produktionslinie läuft, kann mit diesem Vakuumsaugkasten 26 die Position der Warenbahnabhebung über eine Justierung des Vakuumsaugkastens 26 einerseits und der Einstellung des Vakuums andererseits exakt definiert werden. Damit wird der freie Zug zwischen dem Vakuumsaugkasten 26 der Siebeinrichtung 3 und der Saugfangeinrichtung 21 des nachfolgenden Behandlungsaggregats 4 exakt definiert werden. Eine ungleiche Abhebung der Warenbahn wird verhindert. Die Warenbahnspannung zwischen den beiden Siebbändern 11, 20 wird mit einer Durchhangregelung vorzugsweise kontrolliert. Die gleichen Ausführungen gelten für die Schnittstelle 9 zwischen zwei Behandlungsaggregaten 4, 6.At the production speeds just mentioned, a change in the lift of the nonwoven web could quickly lead to web breaks. Therefore, preferably under the screen belt 11 of the screen 3, a variable, along the screen belt 11 displaceable vacuum suction 26 is mounted. After the nonwoven web runs in full width on the production line, with this vacuum suction box 26, the position of the web lift via an adjustment of the vacuum suction box 26 on the one hand and the adjustment of the vacuum on the other hand can be defined exactly. Thus, the free train between the vacuum suction 26 of the screening device 3 and the Saugfangeinrichtung 21 of the subsequent treatment unit 4 will be defined exactly. An uneven lifting of the web is prevented. The web tension between the two screen belts 11, 20 is preferably with a slack control controlled. The same explanations apply to the interface 9 between two treatment units 4, 6.

Erfindungsgemäß kann die Vliesbahn wirtschaftlich günstiger gegenüber herkömmlichen Lösungen überführt werden, und der kontrollierte freie Zug bietet darüber hinaus eine wirtschaftlich günstige Lösung der Warenbahnführung.According to the invention, the nonwoven web can be converted economically more favorably compared to conventional solutions, and the controlled free train moreover offers an economically favorable solution for web guide.

Die vorgenannte Durchhangregelung kann ergänzt werden durch eine Steuereinrichtung zum Kontrollieren der Abhebung, Überführung und Aufnahme eines Endaufführungsbandes 14 an den Schnittstellen 8, 9 mit einer Bahnaufführung 13.The aforesaid slack control can be supplemented by a control device for controlling the lifting, transfer and picking up of an end slack band 14 at the interfaces 8, 9 with a web track 13.

Claims (12)

  1. A method for making wet laid non wovens, in which method an aqueous suspension comprising fibers is deposited onto a wire (3) and in order for a sheet of a non woven web to be formed is dewatered by suction boxes below the wire, said non woven web, prior to being capable of being wound-up, being removed from the wire and being guided to at least one subsequent treatment units (4), and transferring the non woven web from the wire to the at least one subsequent treatment unit, and/or transferring the non woven web at junction points (9) between treatment units (4, 6) in the case of a production start-up and/or upon a production interruption with the aid of a web feeding (13), and wherein a hydroentanglement installation is provided as at least one treatment unit, characterized in that web feeding is performed by way of a transfer that in each case is temporarily closed and is part of a free transfer between the wire and the at least one subsequent treatment unit and/or of a free transfer at a junction between treatment units, and that the transfer that in each case is temporarily closed is generated by air flows which by blowing lifts an end feeding strip (14) as part of the running non woven web, by generating negative pressure attach said end feeding strip to a transportation path installation (19), and by suctioning pick up said end feeding strip at the respective subsequent treatment unit.
  2. The method as claimed in claim 1, characterized in that the end feeding strip (14) is lifted from the wire (3) by way of compressed air.
  3. The method as claimed in either of claims 1 and 2, characterized in that the end feeding strip (14) is transported by way of a vacuum conveyor belt.
  4. The method as claimed in either of claims 1 and 2, characterized in that the end feeding strip (14) is transported by way of an air baffle installation.
  5. The method as claimed in either of claims 3 and 4, characterized in that transporting the end feeding strip (14) is performed by attaching the latter to a lower side of the transportation path installation (19).
  6. The method as claimed in one of claims 1 to 5, characterized in that suctioning on the respective subsequent treatment unit (4, 6) is performed by means of suction trap installation (21) below a wire belt of the subsequent treatment unit.
  7. The method as claimed in one of claims 1 to 6, characterized in that the air flows of the transfer that is temporarily closed are mutually adapted for configuring a uniform web transfer in the region of the transfer.
  8. A device for carrying out the method as claimed in one or a plurality of claims 1 to 7, having a wet non wovens plant (1) having a fiber suspension installation (2), a wire installation (3), at least one subsequent treatment unit (4), and having at least one free transfer at a junction (8) between the wire installation (3) and the subsequent treatment unit (4) and/or at a junction (9) between two subsequent treatment units (4, 6), wherein a hydroentanglement installation is provided as at least one treatment unit (4), said transfer by way of air flow installations of a web feeding installation (13) being temporarily closable for a cut end feeding strip (14), said air flow installations being positioned in such a manner that the end feeding strip (14) as part of the running non woven web (10) is removed by a compressed-air installation (18), is transferred by a transportation path installation (19) that generates negative pressure, and is picked up by an air suction installation (21) of the subsequent treatment unit.
  9. The device as claimed in claim 8, characterized in that, in order for the non woven web (10) to be removed, a suction installation (26) by means of which a transfer position is positionable in the free transfer toward the subsequent treatment unit (4) is provided the compressed-air installation (18) so as to be downstream thereof in the running direction of the non woven web (10).
  10. The device as claimed in either of claims 8 and 9, characterized in that the transportation path installation (19) that generated negative pressure are configured as a vacuum conveyor belt or as an air baffle installation.
  11. The device as claimed in one of claims 8 to 10, characterized in that the transportation path installation (19) has a lower side that is configured as a suction face.
  12. The device as claimed in one of claims 8 to 11, characterized in that, in order for a transferred end feeding strip (14) to be picked up, the subsequent treatment unit (4, 6) on the entry side has a suction trap installation (21) which is connected to a controller installation for controlling lifting, transferring, and picking up of an end feeding strip (14) in the temporarily closed transfer.
EP16702877.8A 2015-01-28 2016-01-27 Method and device for producing wet-laid non-woven fabrics Active EP3250750B1 (en)

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DE102015001008A1 (en) 2016-07-28
US20180002866A1 (en) 2018-01-04
WO2016120014A1 (en) 2016-08-04
EP3250750A1 (en) 2017-12-06
CN107429485B (en) 2020-05-12
US10513826B2 (en) 2019-12-24

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