EP3088603B1 - Method and device for the preparation of wet placed nonwoven fabrics - Google Patents

Method and device for the preparation of wet placed nonwoven fabrics Download PDF

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Publication number
EP3088603B1
EP3088603B1 EP16000924.7A EP16000924A EP3088603B1 EP 3088603 B1 EP3088603 B1 EP 3088603B1 EP 16000924 A EP16000924 A EP 16000924A EP 3088603 B1 EP3088603 B1 EP 3088603B1
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Prior art keywords
installation
screen
web
following treatment
treatment apparatus
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German (de)
French (fr)
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EP3088603A1 (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 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
    • 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 nonwoven fabrics according to the preamble of claims 1 and 8, respectively.
  • WO 2015/000687 A1 discloses a method and a device, wherein the fleece is removed from the sieve via a closed removal.
  • Another approach is to avoid free trains by compromising the arrangement of the machine components, e.g. on top of each other.
  • water is used to shape fibers into a flat structure or wet web.
  • the fibers in the water are passed over a sieve. While the water is sucked through the sieve, the fibers are deposited on the sieve. This process stage is called sheet formation.
  • the nonwoven still contains significantly more water than fibers after sheet formation. Vacuum suction cups continue to remove water from the nonwoven fabric, but the fabric is at the interface after the sieve that is usually formed by an inclined wire former, not a stable product, but a loose composite of fibers.
  • the subject matter of the present invention is based on the object of creating a method and a device for the production of wet webs which improve the web threading at the start of production and / or after a production interruption.
  • the required treatment units / machine components can be arranged one after the other in a known manner. Free trains are provided between the screening device and the at least one subsequent treatment unit. This is particularly advantageous when all treatment units / machine components are to be equipped with different sieve belts for an economical and energetically optimized mode of operation. This is particularly the case, for example, when the production of a wet-laid nonwoven fabric comprises an inclined wire former, a hydroentanglement device and a dewatering belt. Which Interfaces resulting between these treatment units should as far as possible not affect one another, so that free trains are advantageous in this respect.
  • the temporarily closed trains offer the possibility on the one hand to allow free trains between the treatment units / machine components and on the other hand to assign the temporarily closed trains to an automated solution so that the nonwoven web can be performed at higher machine speeds.
  • the wet nonwovens produced on a sieve device especially when long fibers are used, have sufficient strength to be detached from the sieve of the sieve device with compressed air.
  • a web threading device to be provided 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.
  • a tail threading belt of the nonwoven web which is cut from the running web on the outlet side of a sieve belt of the sieving device, is gripped by the temporarily closed draw.
  • This strip is transferred to the subsequent treatment unit with air currents from the temporarily closed train.
  • the cut tail threading belt is removed from the sieve in order to be transferred to a transport device, for example by compressed air.
  • This band can be caught by the subsequent treatment unit using an air flow, so that the created transfer of the tail threading band represents a controlled, temporarily closed train.
  • the invention relates to a method and an apparatus for producing wet laid nonwovens.
  • a wet-laid non-woven system 1 provided for this purpose is shown in FIG Fig. 1a and Figure 1b shown.
  • a fiber suspension device 2 a sieve device 3 at least one subsequent treatment unit 4 and, if necessary, a winder 5 are arranged in series Fig. 1a and Figure 1b
  • a hydroentanglement device is provided as at least one treatment unit 4.
  • Further treatment units 6, 7 are also 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 an inclined screen former.
  • An interface 8 is provided between the sieve device 3 and the subsequent treatment unit 4.
  • an interface 9 is provided between the treatment unit 4 and the treatment unit 6. Both interfaces 8, 9 are designed as free trains when the nonwoven web 10 is listed.
  • the nonwoven web 10 When production starts or after a production interruption, the nonwoven web 10 needs to be fed in order to overcome the distance in the area of the interfaces 8, 9.
  • the method according to the invention for the production of wet-laid nonwovens provides that an aqueous suspension with fibers is deposited on a sieve 11 of the sieving device 3 and drained through suction boxes 12 under the sieve is used for sheet formation of a nonwoven web 10, which is removed from the screen 11 and fed to at least one subsequent treatment unit 4 before the nonwoven web 10 can finally be wound onto 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 when production starts and / or after a production interruption with the aid of a web guide 13.
  • the web threading 13 takes place via a respectively temporarily closed draw of a free draw between wire 11 and the at least one subsequent treatment unit 4 and / or a free draw at an interface 9 between treatment units 4, 6.
  • the respectively temporarily closed draw of a web threading 13 is generated via air currents. These air currents act on a tail threading belt 14, which is cut by means of a cutting device 16 which acts on the nonwoven web 10 on the outlet side of the wire 11.
  • the end threading tape 14 is separated from the remaining web 15 of the nonwoven web 10 by means of the cutting device 16.
  • the web threading takes place by means of the tail threading belt 14, while the remaining web 15 falls into a pulper 17.
  • Fig. 3a shows, according to the invention, the tail threading belt 14 as part of the running nonwoven web 10 is lifted off the wire 11 by blowing it with a compressed air device 18.
  • the tail threading tape 14 is attached to a transport path formed by the transport path device 19 and is taken up by suction on the respective subsequent treatment unit 4.
  • the suction at the subsequent treatment unit 4 takes place, for example, by means of a suction catch device 21.
  • wet nonwoven products have sufficient strength when they have been dewatered on a sieve device 3, which is designed, for example, as an inclined sieve machine. This also applies in particular when long fibers are used to produce the nonwoven web. Because of this strength of the nonwoven web produced by the sieve device 3, the sieve web can be detached from the sieve 11 with compressed air from the compressed air device 18 for a web threading.
  • the tail threading belt 14 lifted off the screen 11 has sufficient stability to be transferred to the transport path device 19 by compressed air.
  • the transport path device 19 is in Fig. 2 shown as an air baffle device. In Fig. 3 the transport path device 19 is designed as a suction conveyor belt. Both transport path devices 19 of the Fig. 2 and the Fig. 3 form a negative pressure due to the air currents present on, preferably on the underside of the transport path device 19. This makes it possible for the tail threading belt 14, lifted off by the compressed air of the compressed air device 18, to be moved to the downstream treatment unit 4.
  • the transfer of the tail threading tape 14 created in this way represents a temporarily closed train. It is essential to the extent that the construction according to the invention enables controlled lifting, transfer and the then subsequent controlled pick-up.
  • the treatment unit 4 is, for example, a hydroentanglement.
  • the tail thread 14 can be further stabilized by such hydroentanglement.
  • the transfer of the end threading belt can again be carried out with compressed air from the sieve belt 20 of the Treatment unit 4 are lifted off and transferred with a vacuum-generating transport device 19 to a next screen belt 22 of a subsequent treatment unit 6 according to the same principle.
  • this further treatment unit 6 is, for example, a vacuum drainage.
  • the end threading belt 14 is usually sufficiently stable to be inserted into a rope cutter.
  • the lifting can in turn take place with compressed air through the sieve belt.
  • the end threading belt 14 can be caught by an air baffle or another sieve belt and transferred to a rope cutter.
  • the described transfer of the tail threading belt 14 with the temporarily closed train can be carried out without problems at production speeds between 200 to 250 m / min and higher.
  • the nonwoven web 10 can be spread across the entire width of the fabric on the screen device 3.
  • the wet fleece is sufficiently stable to be guided over the entire width of the fabric directly after the screening device 3 via a free pull to the next treatment unit.
  • a variable vacuum suction box 26 which can be displaced along the sieve belt 11 is preferably mounted under the sieve belt 11 of the sieve device 3. After the fleece web runs in full width on the production line, this vacuum suction box 26 can be used to precisely define the position of the web lift-off by adjusting the vacuum suction box 26 on the one hand and the setting of the vacuum on the other. So that the free train between the vacuum suction box 26 of the sieve device 3 and the suction catch device 21 of the subsequent treatment unit 4 are precisely defined. Uneven lifting of the web is prevented.
  • the web tension between the two wire belts 11, 20 is preferably controlled with a slack control. The same statements apply to the interface 9 between two treatment units 4, 6.
  • FIG. 3b shows, according to the invention, the tail threading belt 14 is removed from the wire 11 as part of the running nonwoven web 10 by suction by means of a removal suction device 30 with a suction element 31.
  • a suction roller is arranged as a removal sucker 30, which can act on a screen 11 in such a way as to suck the end threading belt 14 directly from the screen 11 by means of negative pressure.
  • Fig. 3a statements made accordingly.
  • the tail threading tape 14 is then passed on, as described above Fig. 3a was carried out in detail.
  • the nozzle 18, according to Fig. 3a is provided, is then preferably omitted.
  • the nonwoven web can be transferred more economically than conventional solutions, and the controlled free draw also offers an economically favorable solution for guiding the web.
  • the aforementioned slack regulation can be supplemented by a control device for controlling the lifting, transferring and receiving of a tail threading tape 14 at the interfaces 8, 9 with a web threading 13.

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 nonwoven fabrics according to the preamble of claims 1 and 8, respectively.

DE 200 19 346 U1 beschreibt eine Vakuum-Bandfördervorrichtung, die zum Einfädeln einer Papierbahn in einer Maschine zur Herstellung oder Veredelung oder Weiterbearbeitung einer solchen Bahn benutzt wird. Aus WO 2011/157890 A1 ist ebenfalls eine Bahnüberführungsvorrichtung für eine Papierbahn bekannt. DE 200 19 346 U1 describes a vacuum belt conveyor device which is used for threading a paper web in a machine for producing or finishing or further processing such a web. Out WO 2011/157890 A1 a web transfer device for a paper web is also known.

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. Dieses Dokument offenbart die Merkmale der Oberbegriffe der Ansprüche 1 bzw. 8.Out DE 24 37 611 A1 It is known that in processes and devices for the production of wet nonwovens, the nonwoven formed on the screen is either passed freely to the downstream unit after removal from the screen or is removed from the screen with a felt-wrapped roller, after which the web is transferred to the following unit on the underside of this pick-up felt. This document discloses the features of the preambles of claims 1 and 8, respectively.

WO 2015/000687 A1 offenbart ein Verfahren bzw. eine Vorrichtung, wobei das Vlies über eine geschlossene Abnahme vom Sieb abgenommen wird. WO 2015/000687 A1 discloses a method and a device, wherein the fleece is removed from the sieve via a closed removal.

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 fleece in free train to the downstream processing unit or on a conveyor belt has the disadvantage that the fleece web must have a considerable initial wet strength in order to survive the removal from the screen cloth and the free transfer to the downstream unit without tearing. Even if the web doesn't break, the web is When it is removed from the screen, as a result of their adhesion to the screen cloth, they are exposed to considerable tensile stresses, as a result of which there is an elongation stress which must be compensated for by changing the speed of the subsequent units.

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 acceptance with the help of a pick-up felt assumes that the nonwoven web adheres well to the underside of the felt while it is running. For this, the pick-up felt must have a sufficient moisture content. In addition, experience has shown that the nonwoven web must contain a considerable proportion of cellulose and have a paper-like character, because otherwise the adhesion is inadequate even with sufficient moisture in the pick-up felt, so that the nonwoven web separates from the pick-up felt and causes operational disruptions.

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, according to DE 24 37 611 A1 provided that the nonwoven web laid down in a suspension sump on an inclined screen and dewatered by suction boxes under the screen runs from this screen with the elimination of intermediate elements directly onto a dryer surface located below the screen. However, such a solution is not suitable if the nonwoven web is to be consolidated prior to drying by means of, for example, hydroentanglement or the application of a binding agent.

Ein weiterer Lösungsansatz insoweit ist die Vermeidung freier Züge durch Kompromisse in der Anordnung der Maschinenkomponenten z.B. übereinander.Another approach is to avoid free trains by compromising the arrangement of the machine components, e.g. on top of each 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 web production, water is used to shape fibers into a flat structure or wet web. The fibers in the water are passed over a sieve. While the water is sucked through the sieve, the fibers are deposited on the sieve. This process stage is called sheet formation. Depending on the type of fiber, the nonwoven still contains significantly more water than fibers after sheet formation. Vacuum suction cups continue to remove water from the nonwoven fabric, but the fabric is at the interface after the sieve that is usually formed by an inclined wire former, 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 outlined, it is therefore advantageous to start at full speed of the former. Only when the former is working at full production speed can the required material consistency be generated to produce a fiber composite that has sufficient internal strength to be transferred to the next conveyor belt or the next treatment unit or the next machine component. At low production speeds, as already 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 web threading.

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.Proceeding from this prior art, the subject matter of the present invention is based on the object of creating a method and a device for the production of wet webs which improve the web threading 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 achieved 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 means that for the production of wet-laid nonwovens using a sieve device, the required treatment units / machine components can be arranged one after the other in a known manner. Free trains are provided between the screening device and the at least one subsequent treatment unit. This is particularly advantageous when all treatment units / machine components are to be equipped with different sieve belts for an economical and energetically optimized mode of operation. This is particularly the case, for example, when the production of a wet-laid nonwoven fabric comprises an inclined wire former, a hydroentanglement device and a dewatering belt. Which Interfaces resulting between these treatment units should as far as possible not affect one another, so that free trains are advantageous in this respect.

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.For modern inclined screen systems, on the one hand, high production speeds are required, on the other hand, there are safety guidelines that prohibit the operator from intervening in the machine. Since the product is performed at full production speed on inclined screen production lines, an automated solution for this is possible according to the invention.

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.According to the invention, the temporarily closed trains offer the possibility on the one hand to allow free trains between the treatment units / machine components and on the other hand to assign the temporarily closed trains to an automated solution so that the nonwoven web can be performed 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, the fact that the wet nonwovens produced on a sieve device, especially when long fibers are used, have sufficient strength to be detached from the sieve of the sieve device with compressed air.

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, provision is therefore made for a web threading device to be provided 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. A tail threading belt of the nonwoven web, which is cut from the running web on the outlet side of a sieve belt of the sieving device, is gripped by the temporarily closed draw. This strip is transferred to the subsequent treatment unit with air currents from the temporarily closed train. The same applies to the interfaces between two adjacent ones Treatment units, for example between the screen belt of a hydroentanglement and a downstream dewatering belt.

Weiterhin ist vorgesehen, dass das geschnittene Endaufführungsband vom Sieb abgenommen wird, um beispielsweise per Druckluft an eine Transporteinrichtung übergeben zu werden. Von dem nachfolgenden Behandlungsaggregat kann dieses Band unter Einsatz einer Luftströmung gefangen werden, so dass die geschaffene Überführung des Endaufführungsbandes einen kontrolliert temporär geschlossenen Zug darstellt.It is also provided that the cut tail threading belt is removed from the sieve in order to be transferred to a transport device, for example by compressed air. This band can be caught by the subsequent treatment unit using an air flow, so that the created transfer of the tail threading band represents a controlled, temporarily closed train.

Weitere Ausgestaltungen der Erfindung sind der nachfolgenden Beschreibung und den Unteransprüchen zu entnehmen.Further refinements of the invention can be found in the following description and the subclaims.

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. 3a zeigt ein zweites Ausführungsbeispiel einer Bahnaufführung für die Schnittstellen X, Y gemäß Fig. 1a,
  • Fig. 3b zeigt ein drittes 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 is explained in more detail below with reference to the exemplary embodiment shown in the accompanying figures.
  • Fig. 1a shows a schematic side view of a wet fleece system with free suspension device, sieve device, hydroentanglement device and dewatering belt,
  • Figure 1b shows schematically the end sections of a wet web machine with dryer and winder,
  • Fig. 2 shows enlarged and schematically an embodiment of a web threading for the interfaces X, Y according to FIG Fig. 1a ,
  • Fig. 3a shows a second embodiment of a web threading for the interfaces X, Y according to FIG Fig. 1a ,
  • Figure 3b shows a third embodiment of a web threading for the interfaces X, Y according to FIG Fig. 1a ,
  • Fig. 4 shows schematically a top view of the outlet-side end area of the screening device in the area of the interface X according to FIG 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 producing wet laid nonwovens. A wet-laid non-woven system 1 provided for this purpose is shown in FIG Fig. 1a and Figure 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, a fiber suspension device 2, a sieve device 3, at least one subsequent treatment unit 4 and, if necessary, a winder 5 are arranged in series Fig. 1a and Figure 1b A hydroentanglement device is provided as at least one treatment unit 4. Further treatment units 6, 7 are also 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. 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 an inclined screen former. An interface 8 is provided between the sieve device 3 and the subsequent treatment unit 4. For example, an interface 9 is provided between the treatment unit 4 and the treatment unit 6. Both interfaces 8, 9 are designed 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.When production starts or after a production interruption, the nonwoven web 10 needs to be fed in order to overcome the distance in the area 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, so dass das Material über eine Luftströmung von dem Sieb 11 abgenommen werden kann. Verdeutlicht ist dies in den Fig. 2 und Fig. 3a, 3b in Verbindung mit Fig. 4.According to the invention, it was found that with wet nonwoven products on an inclined screening machine, as shown as screening device 3 in Fig. 1a is shown by way of example that the nonwoven web 10 produced has sufficient strength so that the material can be removed from the sieve 11 via an air flow. This is made clear in the Fig. 2 and Fig. 3a , 3b 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 method according to the invention for the production of wet-laid nonwovens provides that an aqueous suspension with fibers is deposited on a sieve 11 of the sieving device 3 and drained through suction boxes 12 under the sieve is used for sheet formation of a nonwoven web 10, which is removed from the screen 11 and fed to at least one subsequent treatment unit 4 before the nonwoven web 10 can finally be wound onto 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 when production starts and / or after a production interruption with the aid of a web guide 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 FIGS. 2 to 4 the web threading 13 takes place via a respectively temporarily closed draw of a free draw between wire 11 and the at least one subsequent treatment unit 4 and / or a free draw at an interface 9 between treatment units 4, 6.

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 respectively temporarily closed draw of a web threading 13 is generated via air currents. These air currents act on a tail threading belt 14, which is cut by means of a cutting device 16 which acts on the nonwoven web 10 on the outlet side of the wire 11. The end threading tape 14 is separated from the remaining web 15 of the nonwoven web 10 by means of the cutting device 16. The web threading takes place by means of the tail threading belt 14, while the remaining web 15 falls into a pulper 17.

Wie Fig. 3a zeigt, wird erfindungsgemäß 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.How Fig. 3a shows, according to the invention, the tail threading belt 14 as part of the running nonwoven web 10 is lifted off the wire 11 by blowing it with a compressed air device 18. By generating negative pressure on a transport path device 19, the tail threading tape 14 is attached to a transport path formed by the transport path device 19 and is taken up by suction on the respective subsequent treatment unit 4. The suction at the subsequent treatment unit 4 takes place, for example, by means of a suction catch device 21.

Die vorstehenden Ausführungen zur Bahnaufführung 13 an der Schnittstelle 8 gelten in gleicher Weise für die Bahnaufführung 13 an der Schnittstelle 9.The above statements regarding the web threading 13 at the interface 8 apply in the same way to the web threading 13 at the 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 was found that wet nonwoven products have sufficient strength when they have been dewatered on a sieve device 3, which is designed, for example, as an inclined sieve machine. This also applies in particular when long fibers are used to produce the nonwoven web. Because of this strength of the nonwoven web produced by the sieve device 3, the sieve web can be detached from the sieve 11 with compressed air from the compressed air device 18 for a web threading. The tail threading belt 14 lifted off the screen 11 has sufficient stability to be transferred to the transport path device 19 by compressed air. The transport path device 19 is in Fig. 2 shown as an air baffle device. In Fig. 3 the transport path device 19 is designed as a suction conveyor belt. Both transport path devices 19 of the Fig. 2 and the Fig. 3 form a negative pressure due to the air currents present on, preferably on the underside of the transport path device 19. This makes it possible for the tail threading belt 14, lifted off by the compressed air of the compressed air device 18, to be moved to the downstream 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 transfer of the tail threading tape 14 created in this way represents a temporarily closed train. It is essential to the extent that the construction according to the invention enables controlled lifting, transfer and the then subsequent controlled pick-up.

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 shown, the treatment unit 4 is, for example, a hydroentanglement. The tail thread 14 can be further stabilized by such hydroentanglement. On the free train after this hydroentanglement of the interface 9, the transfer of the end threading belt can again be carried out with compressed air from the sieve belt 20 of the Treatment unit 4 are lifted off and transferred with a vacuum-generating transport device 19 to a next screen belt 22 of a subsequent treatment unit 6 according to the same principle. According to Fig. 1a this further treatment unit 6 is, for example, a vacuum drainage.

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 sieve belt 22 of such a vacuum drainage, the end threading belt 14 is usually sufficiently stable to be inserted into a rope cutter. The lifting can in turn take place with compressed air through the sieve belt. The end threading belt 14 can be caught by an air baffle or another sieve belt and transferred to a rope cutter. The described transfer of the tail threading belt 14 with the temporarily closed train can be carried out without problems 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 end threading belt 14 has been guided through the dryer, for example the treatment unit 7, and a quality assurance unit 25 to the winder 5, the nonwoven web 10 can be spread across the entire width of the fabric on the screen device 3. The wet fleece is sufficiently stable to be guided over the entire width of the fabric directly after the screening device 3 via a free pull 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 lifting of the nonwoven web could quickly lead to web breaks. For this reason, a variable vacuum suction box 26 which can be displaced along the sieve belt 11 is preferably mounted under the sieve belt 11 of the sieve device 3. After the fleece web runs in full width on the production line, this vacuum suction box 26 can be used to precisely define the position of the web lift-off by adjusting the vacuum suction box 26 on the one hand and the setting of the vacuum on the other. So that the free train between the vacuum suction box 26 of the sieve device 3 and the suction catch device 21 of the subsequent treatment unit 4 are precisely defined. Uneven lifting of the web is prevented. The web tension between the two wire belts 11, 20 is preferably controlled with a slack control. The same statements apply to the interface 9 between two treatment units 4, 6.

Wie Fig. 3b zeigt, wird erfindungsgemäß das Endaufführungsband 14 als Teil der laufenden Vliesbahn 10 durch Ansaugen mittels eines Abnahmesaugers 30 mit einem Saugelement 31 vom Sieb 11 abgenommen. Am Kopf der Transportwegeinrichtung 19 ist als Abnahmesauger 30 eine Saugwalze angeordnet, die derart auf ein Sieb 11 wirken kann, um das Endaufführungsband 14 mittels Unterdruck direkt vom Sieb 11 anzusaugen.How Figure 3b shows, according to the invention, the tail threading belt 14 is removed from the wire 11 as part of the running nonwoven web 10 by suction by means of a removal suction device 30 with a suction element 31. At the head of the transport path device 19, a suction roller is arranged as a removal sucker 30, which can act on a screen 11 in such a way as to suck the end threading belt 14 directly from the screen 11 by means of negative pressure.

Im Übrigen gelten die zu Fig. 3a gemachten Ausführungen entsprechend. Durch Unterdruckerzeugung an der Transportwegeinrichtung 19 wird dann nämlich das Endaufführungsband 14 weitergeleitet, wie vorstehend zu Fig. 3a im Einzelnen ausgeführt wurde. Die Blasdüse 18, die gemäß Fig. 3a vorgesehen ist, entfällt dann vorzugsweise.Otherwise the to apply Fig. 3a statements made accordingly. By generating a vacuum at the transport path device 19, the tail threading tape 14 is then passed on, as described above Fig. 3a was carried out in detail. The nozzle 18, according to Fig. 3a is provided, is then preferably omitted.

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 transferred more economically than conventional solutions, and the controlled free draw also offers an economically favorable solution for guiding the web.

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 aforementioned slack regulation can be supplemented by a control device for controlling the lifting, transferring and receiving of a tail threading tape 14 at the interfaces 8, 9 with a web threading 13.

Claims (12)

  1. Method for producing wet-laid non-woven fabrics, in which method an aqueous suspension comprising fibres is deposited on a screen (11) of an inclined-screen former (3) and is dewatered by suction boxes (12) below the screen (11) so as to form a sheet of a non-woven web (10) which is retrieved from the screen (11) and guided to at least one following treatment apparatus (4) before the non-woven web (10) is capable of being wound up; and transferring the non-woven web (10) from the screen (11) to the at least one following treatment apparatus (4) and/or transferring the non-woven web (10) at interfaces (8, 9) between treatment apparatuses (4, 6) when starting production and/or upon an interruption of production while resorting to the aid of a web threading installation (13), wherein the web threading installation (13) takes place by way of a respective temporarily closed draft of a free draft between the screen (11) and the at least one following treatment apparatus (4), and/or by way of a respective temporarily closed draft of a free draft on an interface (9) between treatment apparatuses (4, 6), characterized in that the respective temporarily closed draft is generated by air flows of a web threading installation (13) which by suction retrieve an end feeding strip (14) as part of the running non-woven web (10), by generating negative pressure attach said end feeding strip (14) to a transportation path installation (19), and guide said end feeding strip (14) onward to the respective following treatment apparatus.
  2. Method according to Claim 1, characterized in that the end feeding strip (14) is retrieved by suction air from the screen (11) of the inclined-screen former.
  3. Method according to Claim 1 or 2, characterized in that the end feeding strip (14) is transported by a vacuum conveyor belt.
  4. Method according to Claim 1 or 2, characterized in that the end feeding strip (14) is transported by an air baffle installation.
  5. Method according to Claim 3 or 4, characterized in that the transportation of the end feeding strip (14) takes places by attaching the latter to a lower side of the transportation path installation (19).
  6. Method according to one of Claims 1 to 5, characterized in that suctioning at the respective following treatment apparatus (4, 6) takes place by means of a vacuum trap installation below a screen belt of the following treatment apparatus (4, 6).
  7. Method according to one of Claims 1 to 6, characterized in that the air flows of the temporarily closed draft are mutually adapted so as to configure a uniform web draft in the region of the transfer.
  8. Device for carrying out the method according to one or a plurality of Claims 1 to 7, said device comprising a wet non-wovens plant (1) having a fibrous suspension installation (2), a screen installation (3) as an inclined-screen former, at least one following treatment apparatus (4), and at least one free draft at an interface (8, 9) between the screen installation (3) and the following treatment apparatus (4), and/or at an interface (9) between two following treatment apparatuses (4, 6), said free draft being capable of being temporarily closed, characterized by air flow installations of a web threading installation (13) for a cut end feeding strip (14) which are positioned in such a manner that the end feeding strip (14) as part of the running non-woven web (10) is retrieved by a retrieval vacuum (30) and is transferred to the following treatment apparatus by a transportation path installation (19) generating negative pressure.
  9. Device according to Claim 8, characterized in that the retrieval vacuum (30) for retrieving the non-woven web (10) is provided with a suction installation (26) which is downstream in the running direction of the non-woven web (10) and by means of which a transfer location is capable of being positioned in the free draft to the following treatment apparatus (4).
  10. Device according to Claim 8 or 9, characterized in that the transportation path installation (19) generating negative pressure is configured as a vacuum conveyor belt or as an air baffle installation.
  11. Device according to one of Claims 8 to 10, characterized in that the transportation path installation (19) has a lower side which is configured as a suction face.
  12. Device according to one of Claims 8 to 11, characterized in that the following treatment apparatus (4, 6) for receiving a transferred end feeding strip (14) at the entry side has a vacuum trap installation (21) which is connected to a controller installation for controlling the retrieving, the transferring, and the receiving of and end feeding strip (14) in the temporarily closed draft.
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