EP3495543B1 - System and method for creating a spunbonded fabric - Google Patents

System and method for creating a spunbonded fabric Download PDF

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Publication number
EP3495543B1
EP3495543B1 EP18201508.1A EP18201508A EP3495543B1 EP 3495543 B1 EP3495543 B1 EP 3495543B1 EP 18201508 A EP18201508 A EP 18201508A EP 3495543 B1 EP3495543 B1 EP 3495543B1
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EP
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Prior art keywords
discharge belt
belt
discharge
endless filaments
roll
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EP18201508.1A
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German (de)
French (fr)
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EP3495543A1 (en
Inventor
Thomas Weigert
Ullrich MÜNSTERMANN
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Truetzschler GmbH and Co KG
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Truetzschler GmbH and Co KG
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    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING 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
    • D04H3/00Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/10Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between yarns or filaments made mechanically
    • D04H3/11Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between yarns or filaments made mechanically by fluid jet
    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING 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
    • D04H3/00Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/14Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic yarns or filaments produced by welding

Definitions

  • the present invention relates to a system and a method for producing a spunbonded web from endless filaments, which consist for example of thermoplastic material. Due to their quasi-endless length, continuous filaments differ from staple fibers, which have much shorter lengths of, for example, 10 to 60 mm.
  • nonwoven web which is typically produced by depositing the filaments on a deposit belt.
  • the tray is generally consolidated using a thermal calender. This creates nonwovens with good strength and low thickness. Heavier or more voluminous filament deposits are more difficult to solidify, since the energy input into the center of the product is limited in the time available and, in particular, is no longer sufficient for heating up to the vicinity of the melting point of the plastic. If heavier or more voluminous nonwovens are to be produced, other consolidation methods are expedient, in particular mechanical needling and hydraulic needling or thermal consolidation (preferably by means of hot air).
  • the EP 1408148B2 shows a spunbonding plant, in which the endless filaments are deposited from a spinning tower on a first storage belt. Immediately behind the storage of the endless filaments, suction boxes are arranged under the first storage belt, which hold the continuous filaments on the first storage belt. A first consolidation takes place by means of heated calender rolls. Using an aspirated roller, the continuous filaments are transferred to a second storage belt, on which the solidification takes place using water jets. At very high transport speeds of the spunbonded web of over 250 m / min, the calender rolls cannot transfer enough energy into the continuous filaments for pre-consolidation, since the dwell time in the contact area of the rolls is too short. A further disadvantage is the transfer of the filaments from the first to the second storage belt by means of a suction roller, since undesired warping can occur at the high speeds.
  • the WO02 / 055778 discloses a plant for the production of continuous filaments, which are conveyed from an upper to a lower storage belt.
  • the transfer of the continuous filaments between the belts is made possible by a deflecting roller, whereby it is not disclosed at what speed the continuous filaments on the belts are moved and how the tension in the continuous filaments is generated during the transfer from the upper to the lower belt.
  • a disadvantage of this prior art is the low operating speed of the system, since in particular the introduction of heat by means of calenders into the continuous filaments requires a predetermined energy density. With a higher working / transport speed of the continuous filaments, the calenders would have to be heated well above the melting point of the thermoplastic in order to transfer the energy in the shorter contact time between the rollers. Any slightest disturbance or irregularity at this point would result in undesired sticking of the continuous filaments, as a result of which the subsequent water jet consolidation would at least partially not achieve the desired effect. In other words, the water jet consolidation would have to be significantly oversized in order to evenly consolidate and structure the fleece, which in the event of malfunctions would already be pre-consolidated in places by means of bonding points. Another disadvantage is the introduction of water for pre-moistening, which has to be removed from the fleece in a further complex process step.
  • the object of the invention is the further development of a plant and a method for producing a spunbonded web from continuous filaments at high speeds.
  • the invention relates to a system for producing a spunbonded fabric, comprising a spinnerette with a diffuser for producing continuous filaments, with a first storage belt, which is designed to transport the continuous filaments and transfer them to a subsequent second storage belt, with the second Storage belt is arranged at least one device for the water jet consolidation of the continuous filaments to form a spunbonded fabric, the spunbonded fabric subsequently being consolidated and / or structured by means of at least one further waterjet bonded assembly.
  • the invention is characterized in that the first storage belt transports the continuous filaments dry and unconsolidated, a roller being arranged at the end of the first storage belt or at the beginning of the second storage belt, so that the continuous filaments are guided around the roller with a small wrap angle.
  • the continuous filaments Due to the high transport speed of the continuous filaments, in contrast to the prior art, no solidification, compacting or calendering of the continuous filaments takes place on the first storage belt.
  • the continuous filaments are thus unconsolidated and transported dry on the first deposit belt at a high speed of at least 250 m / min.
  • the system drives the continuous filaments on the first storage belt dry, which means that the continuous filaments are not sprayed or treated with water or another liquid, which can be disruptive for further treatment or reduce the friction of the continuous filaments on the first conveyor belt.
  • the continuous filaments are preferably transported on the storage belts at a speed of at least 250 m / min.
  • Very light spunbonded nonwovens can be produced at high speed.
  • the roller is designed to be permeable to air and can be suctioned. This allows the drag air carried at these high speeds to be extracted.
  • the storage belts can be operated at the same speed, or alternatively the second storage belt can be operated at a slightly higher speed.
  • the roller when the roller is arranged at the beginning of the second deposit belt, the roller must be drivable and be operated at a slightly higher peripheral speed than the transport speed of the second deposit belt.
  • the key is a slight pull or a wrap on the Apply endless filaments so that they can overcome the gusset between the storage belts without any significant sag.
  • the continuous filaments can be treated with a positive or negative distortion.
  • the wrap angle of the continuous filaments around the roller can be adjusted by a displaceable arrangement of the roller horizontally or parallel to one of the storage belts.
  • the system is preferably designed to accommodate a further component between the storage belts, so that, for example, a carded fleece can be introduced in order to be connected together on the second storage belt with the continuous filaments.
  • the process for producing a spunbonded nonwoven provides for producing continuous filaments in a spinnerette with a diffuser and depositing them on a first depositing belt, the first depositing belt transporting and transferring the endless filaments to a second depositing belt, the endless filaments on the second depositing belt forming a spunbonded nonwoven solidify by means of water jet consolidation and subsequently solidify and / or structure by means of at least one further water jet consolidation.
  • the method according to the invention is characterized in that the continuous filaments are transported dry and unconsolidated on the first storage belt, the continuous filaments at least partially wrapping around a roller which is arranged at the end of the first storage belt or at the beginning of the second storage belt around which To reduce sag of the continuous filaments in the gusset between the first and the second storage belt.
  • the transition from the first to the second storage belt is facilitated by the creation of a clamping point. Therefore, the detachment of the continuous filaments from the storage belt during the transition to the storage belt is promoted by the creation of a clamping point by means of the roller. The detachment of the spunbonded fabric from the deposit belt around the suction drum is also facilitated by the creation of the clamping point by means of the roller.
  • the transport speed of the continuous filaments is preferably at least 250 m / min, preferably at least 400 m / min.
  • the system is particularly suitable for light spunbonded nonwovens with a maximum grammage of 60 g / m 2 .
  • the lighter the spunbond, the higher the transport speed can be, for example with a basis weight of 15 g / m 2 from 250 m / min up to 1000 m / min.
  • Figure 1 shows in a first embodiment according to the invention a system 1 for producing a spunbonded fabric, in which a spinnerette with diffuser 2 produces endless filaments 3 and deposits them on a first storage belt 4.
  • the storage belt 4 is designed as an endless rotating belt that is guided around at least two, in this exemplary embodiment around four deflection rollers 4a, 4b, 4c, 4d, and is driven by at least one deflection roller.
  • a first sowing box 5, which is assigned to the spinnerette, is arranged below the storage belt 4 in the region of the point of impact of the continuous filaments 3 on the storage belt 4. In the transport direction of the endless filaments 3 there is another sowing box 6 below the deposit belt 4, with which the endless filaments 3 are held on the deposit belt 4 by means of suction.
  • the storage belt 4 has a large number of perforations through which air can be sucked through in sufficient quantity.
  • the system 1 drives the endless filaments 3 on the first storage belt 4 dry, that is to say that the endless filaments 3 are not sprayed or treated with water or another liquid.
  • no solidification, compacting or calendering of the continuous filaments 3 takes place on the first storage belt 4.
  • the continuous filaments 3 are thus unconsolidated and dry at a high speed of at least 250 m / min, preferably at least 400 m / min, transported on the first storage belt 4.
  • the first storage belt 4 is followed in the transport direction by a second storage belt 7, on which the continuous filaments 3 are subsequently solidified to form a spunbonded nonwoven 11.
  • the second storage belt 7 is also designed as an endless circulating belt which is guided around at least two, in this exemplary embodiment four, deflection rollers 7a, 7b, 7c, 7d and is driven by at least one deflection roller.
  • the storage belt 7 is also designed as a perforated air or water permeable belt. At the transfer point between the first and the second depositing belts 4, 7, the distance between the depositing belts 4, 7 is minimized so that a vacuumed transfer is not necessary. Due to the high transport speed of the endless filaments 3, the sag of the endless filaments 3 in the gusset between the deflection rollers 4b and 7a is very low.
  • a roller 8 is arranged in the region of the deflection roller 7a above the deposit belt 7 and exerts a limited pressure on the endless filaments 3. In contrast to a calender, the roller 8 is moved to the storage belt 7 on a nip. Because the storage belt 7 yields elastically, the endless filaments 3 are guided around the roller 8 with a small wrap angle, so that there is increased friction between the endless filaments 3 and the roller 8, which withstands a limited tensile load. So much tension can be built up to guide the endless filaments 3 over the gusset between the storage belts 4 and 7 without them sagging and at the same time detaching from the endless belt 4, since the dry driving style can lead to the gluing of endless filaments 3 and endless belt 4 .
  • the storage belt 7 with a slightly higher Speed is operated as the storage belt 4.
  • the speed difference can be up to 0.5%.
  • the roller 8 can be permeable to air or have a smooth closed jacket.
  • the roller 8 can also have a structured surface in order to increase the friction with the endless filaments 3.
  • the roller 8 can be rotating or driven. The pressure by the roller 8 on the endless filaments 3 and the storage belt 7, in conjunction with the high transport speed, reduces the low sag in the gusset between the first and the second storage belt 4, 7.
  • the roller 8 can be arranged so that it can be printed with the deflecting roller 7a or with the storage belt 7 exerts on the endless filaments 3 and this clamps slightly (with a defined gap). If the roller 8 is driven, a warpage of, for example, 2-5% of the continuous filaments 3 lying on top of one another can be set with the deposit belt 7 or the deflection roller 7a. Given the high transport speed of the continuous filaments 3, it can be advantageous to design and vacuum the roller 8 as an air-permeable roller, since this allows undesired entrained air flows to be derived. If both storage belts 4, 7 are operated at an identical speed, the roller 8 can be operated at a slightly higher speed than the storage belt 7. The peripheral speed can be up to 0.5% greater than the transport speed of the storage belt 7 the endless filaments 3 are pushed onto the storage belt 7, so that the sag of the endless filaments 3 in the gusset between the storage belts 4, 7 is reduced.
  • the continuous filaments 3 After the continuous filaments 3 have been transferred to the second deposit belt 7, the continuous filaments are first solidified to form a fleece 11 by means of a nozzle bar 9.
  • the nozzle bar can be operated at a low pressure of, for example, 10-40 bar, only to to achieve pre-consolidation.
  • a suction box 10 is arranged below the storage belt 7, with which the water of the nozzle bar 9 is sucked off through the storage belt 7.
  • the solidification carried out by the first nozzle bar 9 can advantageously be very light, so that structuring can take place simultaneously on the subsequent suction drum. If there is no subsequent structuring, the nozzle bar 9 can also be operated at a higher pressure of, for example, 40-400 bar.
  • the fleece 11 is conveyed from the storage belt 7 around a first suction drum 12, which is arranged above the storage belt 7. At least one further nozzle bar 13 applies a high pressure of 40-400 bar to the fleece 11 in order to give the fleece 11 sufficient strength and, if necessary, structuring.
  • the structuring is generally carried out by patterning the suction drum 12, by means of which a shell with a distinctive pattern can be drawn up. After a rotation of approximately 180 ° around the first suction drum 12, there is a further rotation around a second suction drum 14, on which at least one further nozzle bar 15 also solidifies the fleece at a high pressure of 40-400 bar and, if appropriate, finally structures it again.
  • a further treatment of the fleece 11 in a subsequent system for preparation, drying and / or winding is no longer shown in this view, but is part of the overall system concept.
  • the roller 8 can be arranged to be horizontally movable by means of slide strips. Since the storage belt 7 after the deflection roller 7a is vertically flexible due to its expansion, the gap between the storage belt 7 and the roller 8 can be varied by moving the roller 8 horizontally from the deflection roller 7a in the direction of the suction box 10, which reduces the wrap angle of the endless filaments 3 by Roller 8 changes and thus the associated frictional force.
  • a further nozzle bar 16 is arranged below the suction drum 12 and below the storage belt 7 in order to achieve a first compacting by the storage belt 7 and, if necessary, to assist detachment of the pre-consolidated fleece 11 from the storage belt 7.
  • a further improvement of the system 1 can be achieved in that at least one deflecting roller, in this example the deflecting roller 7a, is arranged displaceably in order to reduce the tension from the depositing belt 7 and thus to simplify the replacement of the depositing belts.
  • Both storage belts 4, 7 can be operated at an identical speed.
  • the roller 8 must be operated at a slightly higher peripheral speed than the storage belt 7.
  • the peripheral speed can be up to 0.5% greater than the transport speed of the storage belt 7.
  • the continuous filaments 3 are pushed onto the storage belt 7 so that the sag of the endless filaments 3 in the gusset between the storage belts 4, 7 is reduced.
  • the endless filaments 3 can also be stretched if the roller 8 is operated at a higher speed of 2-5%.
  • the roller 8 can be designed as a non-driven idling roller 8. Alternatively, it can also be driven in order to act on the continuous filaments 3 with a positive or negative delay of 2-3%.
  • the roller 8 is arranged in the end region of the deposit belt 4, in such a way that the roller interacts with the deflection roller 4b.
  • the roller 8 with the storage belt 4 a gap, whereby due to a small wrap angle, a frictional force acts on the endless filaments 3, so that in connection with the wrap of the endless filaments 3 around the suction drums 12, 14, a slight tensile stress acts on the endless filaments 3, so that they do not become hang the gusset between the storage straps 4 and 7.
  • the roller 8 can advantageously be designed as an air-permeable and vacuumed roller in order to remove the drag air from the system.
  • the storage belt 7 was modified and a further deflection roller 7e was inserted in order to create space for a further application in the area of the gusset, for example for a winding 17 for a carded fleece, in order to combine this with the continuous filaments on the second storage belt 7.
  • the deflection roller 7a is also arranged at least horizontally displaceable here.
  • the speed of the storage belts 4 and 7 can be identical in this exemplary embodiment or the speed of the storage belt 7 can be slightly above the speed of the storage belt 4.
  • the tension on the endless filaments 3 is either generated by the wrapping and thus friction with the roller 8, or by the higher speed of the deposit belt 7.
  • the roller cannot be driven and run in unison.
  • the roller 8 can be driven in order to set a positive or negative distortion of 2-5% with the deposit belt 4, so that either the roller 8 is driven faster or slower.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Nonwoven Fabrics (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)

Description

Die vorliegende Erfindung betrifft eine Anlage und ein Verfahren zur Herstellung eines Spinnvlieses aus endlosen Filamenten, die beispielsweise aus thermoplastischem Kunststoff bestehen. Endlosfilamente unterscheiden sich aufgrund ihrer quasi endlosen Länge von Stapelfasern, die wesentlich geringere Längen von beispielsweise 10 bis 60 mm aufweisen.The present invention relates to a system and a method for producing a spunbonded web from endless filaments, which consist for example of thermoplastic material. Due to their quasi-endless length, continuous filaments differ from staple fibers, which have much shorter lengths of, for example, 10 to 60 mm.

Aus der Praxis ist es hinlänglich bekannt, eine Vliesbahn, die typischerweise durch Ablage der Filamente auf einem Ablageband erzeugt wird, zu verfestigen. Für Vliese mit Flächengewichten von 10 bis 80 g/m2 wird die Ablage in der Regel mittels eines Thermokalanders verfestigt. Dadurch entstehen Vliese mit guter Festigkeit und geringer Dicke. Schwerere bzw. voluminösere Filamentablagen sind schwieriger zu verfestigen, da der Energieeintrag in die Mitte des Produktes in der zur Verfügung stehenden Zeit begrenzt ist und insbesondere für das Erwärmen bis in die Nähe des Schmelzpunktes des Kunststoffes nicht mehr ausreicht. Wenn schwerere bzw. voluminösere Vliese hergestellt werden sollen, sind andere Verfestigungsverfahren zweckmäßig und zwar insbesondere mechanisches Vernadeln und hydraulisches Vernadeln oder Thermoverfestigen (vorzugsweise mittels Heißluft). Im Zusammenhang mit diesen Verfestigungsverfahren ist es immer erforderlich, die Vliesbahn vom Ablageband bzw. Siebband abzulösen und möglichst ohne Beeinträchtigung der Vliesbahn bzw. ohne Beeinträchtigung der Gleichmäßigkeit der Vliesbahn der Verfestigung/Endverfestigung zuzuführen.It is well known in practice to consolidate a nonwoven web, which is typically produced by depositing the filaments on a deposit belt. For nonwovens with basis weights of 10 to 80 g / m 2 , the tray is generally consolidated using a thermal calender. This creates nonwovens with good strength and low thickness. Heavier or more voluminous filament deposits are more difficult to solidify, since the energy input into the center of the product is limited in the time available and, in particular, is no longer sufficient for heating up to the vicinity of the melting point of the plastic. If heavier or more voluminous nonwovens are to be produced, other consolidation methods are expedient, in particular mechanical needling and hydraulic needling or thermal consolidation (preferably by means of hot air). In connection with these consolidation processes, it is always necessary to detach the nonwoven web from the depositing belt or screen belt and, if possible, to carry out the consolidation / final consolidation without impairing the nonwoven web or without impairing the uniformity of the nonwoven web.

Die EP 1408148B2 zeigt eine Spinnvliesanlage, bei der die endlosen Filamente von einem Spinnturm auf ein erstes Ablageband abgelegt werden. Unmittelbar hinter der Ablage der Endlosfilamente sind unter dem ersten Ablageband Saugkästen angeordnet, die die Endlosfilamente auf dem ersten Ablageband halten. Eine erste Verfestigung erfolgt mittels beheizter Kalanderwalzen. Mittels einer besaugten Walze werden die Endlosfilamente auf ein zweites Ablageband übergeben, auf dem die Verfestigung mittels Wasserstrahlen erfolgt. Bei sehr hohen Transportgeschwindigkeiten des Spinnvlieses von über 250 m/min können die Kalanderwalzen nicht genügend Energie in die Endlosfilamente zur Vorverfestigung übertragen, da die Verweilzeit im Kontaktbereich der Walzen zu gering ist. Ein weiterer Nachteil ist die Übergabe der Filamente von dem ersten auf das zweite Ablageband mittels Saugwalze, da bei den hohen Geschwindigkeiten unerwünschte Verzüge auftreten können.The EP 1408148B2 shows a spunbonding plant, in which the endless filaments are deposited from a spinning tower on a first storage belt. Immediately behind the storage of the endless filaments, suction boxes are arranged under the first storage belt, which hold the continuous filaments on the first storage belt. A first consolidation takes place by means of heated calender rolls. Using an aspirated roller, the continuous filaments are transferred to a second storage belt, on which the solidification takes place using water jets. At very high transport speeds of the spunbonded web of over 250 m / min, the calender rolls cannot transfer enough energy into the continuous filaments for pre-consolidation, since the dwell time in the contact area of the rolls is too short. A further disadvantage is the transfer of the filaments from the first to the second storage belt by means of a suction roller, since undesired warping can occur at the high speeds.

Die WO02/055778 offenbart eine Anlage zur Herstellung von Endlosfilamenten, die von einem oberen auf ein unteres Ablageband gefördert werden. Die Übergabe der Endlosfilamente zwischen den Bändern wird durch eine Umlenkwalze ermöglicht, wobei nicht offenbart wird, mit welcher Geschwindigkeit die Endlosfilamente auf den Bändern bewegt werden und wie die Spannung in den Endlosfilamenten bei der Übergabe vom oberen auf das untere Band erzeugt wird.The WO02 / 055778 discloses a plant for the production of continuous filaments, which are conveyed from an upper to a lower storage belt. The transfer of the continuous filaments between the belts is made possible by a deflecting roller, whereby it is not disclosed at what speed the continuous filaments on the belts are moved and how the tension in the continuous filaments is generated during the transfer from the upper to the lower belt.

Aus der EP 1967628 B1 ist es bekannt, die Filamentablage unmittelbar hinter ihrem Ablagebereich mit einem beheizten Kalander zu kompaktieren. Dem schließt sich eine erste Befeuchtungseinrichtung zur Vorbefeuchtung der Vliesbahn an, mit dem ein Nebel oder Strahlen aus Wasser auf die Endlosfilamente gesprüht wird. Der Kalander hat die Aufgabe, die abgelegten Endlosfilamente vorzuverfestigen ohne Bonding-Punkte zwischen den einzelnen Filamenten entstehen zu lassen, was sich damit deutlich von der Verfestigung in der nachfolgenden Wasserstrahlverfestigung unterscheidet. Die anschließende Befeuchtungsanlage erzeugt eine schonende Einbringung von Flüssigkeit in die auf- bzw. nebeneinanderliegenden Endlosfilamente, so dass störende Luftbewegungen vermieden werden können. Gleichzeitig werden die Reibwerte zwischen den Filamenten erhöht, wobei das Wasser als Haftmittel wirkt und dabei die Verschiebung der Endlosfilamente untereinander reduziert wird.From the EP 1967628 B1 it is known to compact the filament storage immediately behind its storage area with a heated calender. This is followed by a first moistening device for pre-moistening the nonwoven web, with which a mist or jet of water is sprayed onto the continuous filaments. The calender has the task of pre-consolidating the deposited continuous filaments without creating bonding points between the individual filaments, which is therefore very different from the consolidation in the subsequent water jet consolidation. The subsequent humidification system generates a gentle introduction of liquid into the continuous filaments, which lie on top of or next to one another, so that disruptive air movements can be avoided. At the same time, the coefficients of friction between the filaments are increased, the water acting as an adhesive and the displacement of the endless filaments among themselves being reduced.

Nachteilig an diesem Stand der Technik ist die geringe Arbeitsgeschwindigkeit der Anlage, da insbesondere die Einbringung von Wärme mittels Kalander in die Endlosfilamente eine vorbestimmte Energiedichte erfordert. Bei einer höheren Arbeits-/Transportgeschwindigkeit der Endlosfilamente müssten die Kalander weit über den Schmelzpunkt des thermoplastischen Kunststoffes erhitzt werden, um in der geringeren Kontaktzeit zwischen den Walzen die Energie zu übertragen. Jede kleinste Störung oder Unregelmäßigkeit an dieser Stelle hätte ein unerwünschtes Verkleben der Endlosfilamente zur Folge, wodurch die nachfolgende Wasserstrahlverfestigung zumindest teilweise nicht den gewünschten Effekt erzielen würde. Oder anders ausgedrückt, die Wasserstrahlverfestigung müsste deutlich überdimensioniert werden, um das Vlies, das bei Störungen bereits mittels Bonding-Punkten stellenweise vorverfestigt wäre, gleichmäßig zu verfestigen und zu strukturieren. Ein weiterer Nachteil ist die Einbringung von Wasser zur Vorbefeuchtung, das in einem weiteren aufwändigen Prozessschritt aus dem Vlies entfernt werden muss.A disadvantage of this prior art is the low operating speed of the system, since in particular the introduction of heat by means of calenders into the continuous filaments requires a predetermined energy density. With a higher working / transport speed of the continuous filaments, the calenders would have to be heated well above the melting point of the thermoplastic in order to transfer the energy in the shorter contact time between the rollers. Any slightest disturbance or irregularity at this point would result in undesired sticking of the continuous filaments, as a result of which the subsequent water jet consolidation would at least partially not achieve the desired effect. In other words, the water jet consolidation would have to be significantly oversized in order to evenly consolidate and structure the fleece, which in the event of malfunctions would already be pre-consolidated in places by means of bonding points. Another disadvantage is the introduction of water for pre-moistening, which has to be removed from the fleece in a further complex process step.

Aufgabe der Erfindung ist die Weiterbildung einer Anlage und eines Verfahrens zur Herstellung eines Spinnvlieses aus Endlosfilamenten bei hohen Geschwindigkeiten.The object of the invention is the further development of a plant and a method for producing a spunbonded web from continuous filaments at high speeds.

Diese Aufgabe wird ausgehend von einer Anlage und einem Verfahren gemäß dem Oberbegriff der Ansprüche 1 und 13 in Verbindung mit den kennzeichnenden Merkmalen gelöst. Vorteilhafte Weiterbildungen der Erfindung sind in den abhängigen Ansprüchen angegeben.This object is achieved on the basis of a system and a method according to the preamble of claims 1 and 13 in conjunction with the characterizing features. Advantageous developments of the invention are specified in the dependent claims.

Nach Anspruch 1 betrifft die Erfindung eine Anlage zur Herstellung eines Spinnvlieses, umfassend eine Spinnerette mit einem Diffusor zur Herstellung von Endlosfilamenten, mit einem ersten Ablageband, das ausgebildet ist, die Endlosfilamente zu transportieren und an ein nachfolgendes zweites Ablageband zu übergeben, wobei an dem zweiten Ablageband mindestens eine Einrichtung zur Wasserstrahlverfestigung der Endlosfilamente zu einem Spinnvlies angeordnet ist, wobei das Spinnvlies nachfolgend mittels mindestens einer weiteren Wasserstrahlverfestigung verfestigt und/oder strukturiert wird.According to claim 1, the invention relates to a system for producing a spunbonded fabric, comprising a spinnerette with a diffuser for producing continuous filaments, with a first storage belt, which is designed to transport the continuous filaments and transfer them to a subsequent second storage belt, with the second Storage belt is arranged at least one device for the water jet consolidation of the continuous filaments to form a spunbonded fabric, the spunbonded fabric subsequently being consolidated and / or structured by means of at least one further waterjet bonded assembly.

Die Erfindung ist dadurch gekennzeichnet, dass das erste Ablageband die Endlosfilamente trocken und unverfestigt transportiert, wobei eine Walze an dem Ende des ersten Ablagebandes oder an dem Anfang des zweiten Ablagebandes angeordnet ist, so dass die Endlosfilamente mit einem kleinen Umschlingungswinkel um die Walze geführt werden.The invention is characterized in that the first storage belt transports the continuous filaments dry and unconsolidated, a roller being arranged at the end of the first storage belt or at the beginning of the second storage belt, so that the continuous filaments are guided around the roller with a small wrap angle.

Aufgrund der hohen Transportgeschwindigkeit der Endlosfilamente erfolgt im Gegensatz zum Stand der Technik auf dem ersten Ablageband keinerlei Verfestigung, Kompaktierung oder Kalandrierung der Endlosfilamente. Die Endlosfilamente werden damit unverfestigt und trocken mit einer hohen Geschwindigkeit von mindestens 250 m/min auf dem ersten Ablageband transportiert. Die Anlage fährt die Endlosfilamente auf dem ersten Ablageband trocken, d.h., dass die Endlosfilamente nicht mit Wasser oder einer anderen Flüssigkeit besprüht oder behandelt werden, was für die weitere Behandlung störend sein kann oder die Auflagereibung der Endlosfilamente auf dem ersten Transportband reduzieren kann. Damit der Zwickel zwischen den beiden Ablagebändern ohne Saugzug durch die Endlosfilamente überfahren werden kann, ohne dass die Endlosfilamente hier durchhängen, wird mittels einer Walze eine geringe Reibkraft auf die Endlosfilamente erzeugt, indem diese die Walze um einen kleinen Winkel umschlingen. Der Winkel kann bis zu 45° betragen und wird erzeugt, in dem die Walze mit geringer Kraft in eines der Ablagebänder eintaucht. Dadurch, dass die Ablagebänder elastisch nachgeben, werden die Endlosfilamente mit einem kleinen Umschlingungswinkel um die Walze geführt, so dass eine verstärkte Reibung zwischen den Endlosfilamenten und der Walze auftritt, die einer begrenzten Zugbelastung standhält. Damit kann so viel Spannung aufgebaut werden, dass die Endlosfilamente über den Zwickel zwischen den Ablagebändern geführt werden können, ohne dass diese durchhängen. Gleichzeitig wird ein Verdichten bzw. Kompaktieren der Endlosfilamente vermieden, so dass nachfolgend eine Vorverfestigung mittels Wasserstrahlverfestigung mit geringem Druck möglich ist. Die trockene Fahrweise der Endlosfilamente auf dem Ablageband verstärkt die Adhäsion zwischen den Endlosfilamenten und dem Ablageband, was zu einem verkleben neigt. Daher wird die Ablösung der Endlosfilamente vom Ablageband beim Übergang auf das Ablageband durch die Erzeugung eines Klemmpunktes mittels der Walze begünstigt. Auch die Ablösung des Spinnvlieses vom Ablageband um die Saugtrommel wird durch die Erzeugung des Klemmpunktes mittels der Walze erleichtert.Due to the high transport speed of the continuous filaments, in contrast to the prior art, no solidification, compacting or calendering of the continuous filaments takes place on the first storage belt. The continuous filaments are thus unconsolidated and transported dry on the first deposit belt at a high speed of at least 250 m / min. The system drives the continuous filaments on the first storage belt dry, which means that the continuous filaments are not sprayed or treated with water or another liquid, which can be disruptive for further treatment or reduce the friction of the continuous filaments on the first conveyor belt. So that the gusset between the two storage belts can be run over by the endless filaments without suction, without the endless filaments sagging here, a low frictional force is generated on the endless filaments by means of a roller by wrapping them around the roller at a small angle. The angle can be up to 45 ° and is generated by immersing the roller in one of the storage belts with little force. Because the storage belts give way elastically, the continuous filaments are guided around the roller with a small wrap angle, so that there is increased friction between the continuous filaments and the roller, that withstands a limited tensile load. So much tension can be built up that the continuous filaments can be guided over the gusset between the storage belts without them sagging. At the same time, compression or compacting of the continuous filaments is avoided, so that subsequent pre-consolidation by means of water jet consolidation at low pressure is possible. The dry operation of the continuous filaments on the storage belt increases the adhesion between the continuous filaments and the storage belt, which tends to stick. Therefore, the detachment of the continuous filaments from the storage belt during the transition to the storage belt is promoted by the creation of a nip point by means of the roller. The detachment of the spunbonded fabric from the deposit belt around the suction drum is also facilitated by the creation of the clamping point by means of the roller.

Vorzugsweise werden die Endlosfilamente auf den Ablagebändern mit einer Geschwindigkeit von mindestens 250 m/min transportieren. Es können mit hoher Geschwindigkeit sehr leichte Spinnvliese hergestellt werden.The continuous filaments are preferably transported on the storage belts at a speed of at least 250 m / min. Very light spunbonded nonwovens can be produced at high speed.

In einer bevorzugten Ausführungsform ist die Walze luftdurchlässig ausgebildet und besaugbar. Damit kann die bei diesen hohen Geschwindigkeiten mitgeführte Schleppluft abgesaugt werden.In a preferred embodiment, the roller is designed to be permeable to air and can be suctioned. This allows the drag air carried at these high speeds to be extracted.

Die Ablagebänder können mit der gleichen Geschwindigkeit betrieben werden, oder alternativ kann das zweite Ablageband mit einer geringfügig höheren Geschwindigkeit betrieben werden. Im ersten Fall, wenn die Walze am Anfang des zweiten Ablagebandes angeordnet ist, muss die Walze antreibbar sein und mit einer geringfügig höheren Umfangsgeschwindigkeit betrieben werden, als die Transportgeschwindigkeit des zweiten Ablagebandes. Entscheidend ist, einen geringen Zug oder eine Umschlingungsreibung auf die Endlosfilamente aufzubringen, damit diese ohne nennenswerten Durchhang den Zwickel zwischen den Ablagebändern überwinden können.The storage belts can be operated at the same speed, or alternatively the second storage belt can be operated at a slightly higher speed. In the first case, when the roller is arranged at the beginning of the second deposit belt, the roller must be drivable and be operated at a slightly higher peripheral speed than the transport speed of the second deposit belt. The key is a slight pull or a wrap on the Apply endless filaments so that they can overcome the gusset between the storage belts without any significant sag.

Dadurch, dass zwischen der Umfangsgeschwindigkeit der Walze und der Transportgeschwindigkeit der Ablagebänder eine Geschwindigkeitsdifferenz von bis zu 5 % einstellbar ist, können die Endlosfilamente mit einem positiven oder negativen Verzug behandelt werden.Because a speed difference of up to 5% can be set between the peripheral speed of the roller and the transport speed of the deposit belts, the continuous filaments can be treated with a positive or negative distortion.

Durch eine verschiebbare Anordnung der Walze horizontal bzw. parallel zu einem der Ablagebänder kann der Umschlingungswinkel der Endlosfilamente um die Walze eingestellt werden.The wrap angle of the continuous filaments around the roller can be adjusted by a displaceable arrangement of the roller horizontally or parallel to one of the storage belts.

Vorzugsweise ist die Anlage ausgebildet, zwischen den Ablagebändern eine weitere Komponente aufzunehmen, so dass beispielsweise ein kardiertes Vlies eingeführt werden kann, um zusammen auf dem zweiten Ablageband mit den Endlosfilamenten verbunden zu werden.The system is preferably designed to accommodate a further component between the storage belts, so that, for example, a carded fleece can be introduced in order to be connected together on the second storage belt with the continuous filaments.

Das Verfahren zur Herstellung eines Spinnvlieses sieht vor, Endlosfilamenten in einer Spinnerette mit einem Diffusor herzustellen und auf einem ersten Ablageband abzulegen, wobei das erste Ablageband die Endlosfilamente zu einem zweiten Ablageband transportiert und an dieses übergibt, wobei die Endlosfilamente auf dem zweiten Ablageband zu einem Spinnvlies mittels Wasserstrahlverfestigung zu verfestigen und nachfolgend mittels mindestens einer weiteren Wasserstrahlverfestigung zu verfestigen und/oder zu strukturieren.The process for producing a spunbonded nonwoven provides for producing continuous filaments in a spinnerette with a diffuser and depositing them on a first depositing belt, the first depositing belt transporting and transferring the endless filaments to a second depositing belt, the endless filaments on the second depositing belt forming a spunbonded nonwoven solidify by means of water jet consolidation and subsequently solidify and / or structure by means of at least one further water jet consolidation.

Das erfindungsgemäße Verfahren ist dadurch gekennzeichnet, dass die Endlosfilamente auf dem ersten Ablageband trocken und unverfestigt transportiert werden, wobei die Endlosfilamente zumindest teilweise eine Walze umschlingen, die an dem Ende des ersten Ablagebandes oder an dem Anfang des zweiten Ablagebandes angeordnet ist, um den Durchhang der Endlosfilamente im Zwickel zwischen dem ersten und dem zweiten Ablageband zu reduzieren.The method according to the invention is characterized in that the continuous filaments are transported dry and unconsolidated on the first storage belt, the continuous filaments at least partially wrapping around a roller which is arranged at the end of the first storage belt or at the beginning of the second storage belt around which To reduce sag of the continuous filaments in the gusset between the first and the second storage belt.

Um die anhaftenden Endlosfilamente vom Ablageband zu lösen, wird durch die Erzeugung eines Klemmpunktes der Übergang vom ersten zum zweiten Ablageband erleichtert. Daher wird die Ablösung der Endlosfilamente vom Ablageband beim Übergang auf das Ablageband durch die Erzeugung eines Klemmpunktes mittels der Walze begünstigt. Auch die Ablösung des Spinnvlieses vom Ablageband um die Saugtrommel wird durch die Erzeugung des Klemmpunktes mittels der Walze erleichtert.In order to detach the adhering endless filaments from the storage belt, the transition from the first to the second storage belt is facilitated by the creation of a clamping point. Therefore, the detachment of the continuous filaments from the storage belt during the transition to the storage belt is promoted by the creation of a clamping point by means of the roller. The detachment of the spunbonded fabric from the deposit belt around the suction drum is also facilitated by the creation of the clamping point by means of the roller.

Vorzugsweise beträgt die Transportgeschwindigkeit der Endlosfilamente mindestens 250 m/min, vorzugsweise mindestens 400 m/min. Insbesondere für leichte Spinnvliese mit einem Flächengewicht von maximal 60 g/m2 ist die Anlage geeignet. Je leichter das Spinnvlies, umso höher kann die Transportgeschwindigkeit sein, beispielsweise bei einem Flächengewicht von 15 g/m2 von 250 m/min bis zu 1000 m/min.The transport speed of the continuous filaments is preferably at least 250 m / min, preferably at least 400 m / min. The system is particularly suitable for light spunbonded nonwovens with a maximum grammage of 60 g / m 2 . The lighter the spunbond, the higher the transport speed can be, for example with a basis weight of 15 g / m 2 from 250 m / min up to 1000 m / min.

Weitere, die Erfindung verbessernde Maßnahmen werden nachstehend gemeinsam mit der Beschreibung eines bevorzugten Ausführungsbeispiels der Erfindung anhand der Figuren näher dargestellt. Es zeigen:

Figur 1
ein erstes Ausführungsbeispiel der Erfindung;
Figur 2
ein zweites Ausführungsbeispiel der Erfindung;
Figur 3
ein drittes Ausführungsbeispiel der Erfindung.
Further measures improving the invention are described below together with the description of a preferred embodiment of the invention with reference to the figures. Show it:
Figure 1
a first embodiment of the invention;
Figure 2
a second embodiment of the invention;
Figure 3
a third embodiment of the invention.

Figur 1 zeigt in einer ersten erfindungsgemäßen Ausführungsform eine Anlage 1 zur Erzeugung eines Spinnvlieses, bei dem eine Spinnerette mit Diffusor 2 Endlosfilamente 3 produziert und auf einem ersten Ablageband 4 ablegt. Das Ablageband 4 ist als endloses umlaufendes Band ausgebildet, dass um mindestens zwei, in diesem Ausführungsbeispiel um vier Umlenkrollen 4a, 4b, 4c, 4d, geführt und von mindestens einer Umlenkrolle angetrieben wird. Im Bereich der Auftreffstelle der Endlosfilamente 3 auf das Ablageband 4 ist unterhalb des Ablagebandes 4 ein erster Saukasten 5 angeordnet, der der Spinnerette zugeordnet ist. In Transportrichtung der Endlosfilamente 3 befindet sich unterhalb des Ablagebandes 4 ein weiterer Saukasten 6, mit dem die Endlosfilamente 3 auf dem Ablageband 4 mittels Saugzug gehalten werden. Hierzu weist das Ablageband 4 eine Vielzahl von Perforierungen auf, durch die Luft in ausreichender Menge durchsaugt werden kann. Die Anlage 1 fährt die Endlosfilamente 3 auf dem ersten Ablageband 4 trocken, d.h., dass die Endlosfilamente 3 nicht mit Wasser oder einer anderen Flüssigkeit besprüht oder behandelt werden. Im Gegensatz zum Stand der Technik erfolgt auf dem ersten Ablageband 4 auch keinerlei Verfestigung, Kompaktierung oder Kalandrierung der Endlosfilamente 3. Die Endlosfilamente 3 werden damit unverfestigt und trocken mit einer hohen Geschwindigkeit von mindestens 250 m/min, vorzugsweise mindestens 400 m/min, auf dem ersten Ablageband 4 transportiert. Dem ersten Ablageband 4 folgt in Transportrichtung ein zweites Ablageband 7, auf dem die anschließende Verfestigung der Endlosfilamente 3 zu einem Spinnvlies 11 erfolgt. Das zweite Ablageband 7 ist ebenfalls als endloses umlaufendes Band ausgebildet, dass um mindestens zwei, in diesem Ausführungsbeispiel um vier Umlenkrollen 7a, 7b, 7c, 7d geführt und von mindestens einer Umlenkrolle angetrieben wird. Das Ablageband 7 ist ebenfalls als perforiertes luft- bzw. wasserdurchlässiges Band ausgebildet. An der Übergabestelle zwischen dem ersten und dem zweiten Ablageband 4, 7 ist der Abstand zwischen den Ablagebändern 4, 7 so minimiert, dass eine besaugtes Übergabe nicht erforderlich ist. Aufgrund der hohen Transportgeschwindigkeit der Endlosfilamente 3 ist der Durchhang der Endlosfilamente 3 im Zwickel zwischen den Umlenkrollen 4b und 7a sehr gering. Figure 1 shows in a first embodiment according to the invention a system 1 for producing a spunbonded fabric, in which a spinnerette with diffuser 2 produces endless filaments 3 and deposits them on a first storage belt 4. The storage belt 4 is designed as an endless rotating belt that is guided around at least two, in this exemplary embodiment around four deflection rollers 4a, 4b, 4c, 4d, and is driven by at least one deflection roller. A first sowing box 5, which is assigned to the spinnerette, is arranged below the storage belt 4 in the region of the point of impact of the continuous filaments 3 on the storage belt 4. In the transport direction of the endless filaments 3 there is another sowing box 6 below the deposit belt 4, with which the endless filaments 3 are held on the deposit belt 4 by means of suction. For this purpose, the storage belt 4 has a large number of perforations through which air can be sucked through in sufficient quantity. The system 1 drives the endless filaments 3 on the first storage belt 4 dry, that is to say that the endless filaments 3 are not sprayed or treated with water or another liquid. In contrast to the prior art, no solidification, compacting or calendering of the continuous filaments 3 takes place on the first storage belt 4. The continuous filaments 3 are thus unconsolidated and dry at a high speed of at least 250 m / min, preferably at least 400 m / min, transported on the first storage belt 4. The first storage belt 4 is followed in the transport direction by a second storage belt 7, on which the continuous filaments 3 are subsequently solidified to form a spunbonded nonwoven 11. The second storage belt 7 is also designed as an endless circulating belt which is guided around at least two, in this exemplary embodiment four, deflection rollers 7a, 7b, 7c, 7d and is driven by at least one deflection roller. The storage belt 7 is also designed as a perforated air or water permeable belt. At the transfer point between the first and the second depositing belts 4, 7, the distance between the depositing belts 4, 7 is minimized so that a vacuumed transfer is not necessary. Due to the high transport speed of the endless filaments 3, the sag of the endless filaments 3 in the gusset between the deflection rollers 4b and 7a is very low.

Eine Walze 8 ist im Bereich der Umlenkrolle 7a oberhalb des Ablagebandes 7 angeordnet und übt einen begrenzten Druck auf die Endlosfilamente 3 aus. Im Gegensatz zu einem Kalander wird die Walze 8 zum Ablageband 7 auf Spalt gefahren. Dadurch, dass das Ablageband 7 elastisch nachgibt, werden die Endlosfilamente 3 mit einem kleinen Umschlingungswinkel um die Walze 8 geführt, so dass eine verstärkte Reibung zwischen den Endlosfilamenten 3 und der Walze 8 auftritt, die einer begrenzten Zugbelastung standhält. Damit kann so viel Spannung aufgebaut werden, um die Endlosfilamente 3 über den Zwickel zwischen den Ablagebändern 4 und 7 zu führen, ohne dass diese durchhängen und sich gleichzeitig vom Endlosband 4 lösen, da die trockene Fahrweise zum Verkleben von Endlosfilamenten 3 und Endlosband 4 führen können. Gleichzeitig wird ein Verdichten bzw. Kompaktieren der Endlosfilamente vermieden, so dass nachfolgend eine Vorverfestigung mittels Wasserstrahlverfestigung mit geringem Druck möglich ist. Hierzu ist es vorteilhaft, wenn das Ablageband 7 mit einer geringfügig höheren Geschwindigkeit betrieben wird, als das Ablageband 4. Vorzugsweise kann die Geschwindigkeitsdifferenz bis zu 0,5% betragen. Die Walze 8 kann luftdurchlässig sein oder einen glatten geschlossenen Mantel aufweisen. Alternativ kann die Walze 8 auch eine strukturierte Oberfläche aufweisen, um die Reibung mit den Endlosfilamenten 3 zu erhöhen Die Walze 8 kann mitlaufend oder angetrieben sein. Der Druck durch die Walze 8 auf die Endlosfilamente 3 und das Ablageband 7 reduziert in Verbindung mit der hohen Transportgeschwindigkeit den geringen Durchhang im Zwickel zwischen dem ersten und dem zweiten Ablageband 4, 7. Die Walze 8 kann so angeordnet sein, dass sie einen Druck mit der Umlenkrolle 7a oder mit dem Ablageband 7 auf die Endlosfilamente 3 ausübt und diese dabei leicht (mit definiertem Spalt) klemmt. Ist die Walze 8 angetrieben, so kann ein Verzug von beispielsweise 2-5 % der aufeinanderliegenden Endlosfilamente 3 mit dem Ablageband 7 bzw. der Umlenkrolle 7a eingestellt werden. Bei der hohen Transportgeschwindigkeit der Endlosfilamente 3 kann es vorteilhaft sein, die Walze 8 als luftdurchlässige Walze auszubilden und zu besaugen, da hiermit unerwünschte mitgeschleppte Luftströmungen abgeleitet werden können. Werden beide Ablagebänder 4, 7 mit einer identischen Geschwindigkeit betrieben, kann die Walze 8 mit einer leicht höheren Geschwindigkeit betrieben werden, als das Ablageband 7. Die Umfangsgeschwindigkeit kann bis zu 0,5% größer sein, als die Transportgeschwindigkeit des Ablagebandes 7. Damit werden die Endlosfilamente 3 auf dem Ablageband 7 angeschoben, so dass sich der Durchhang der Endlosfilamente 3 im Zwickel zwischen den Ablagebändern 4, 7 reduziert.A roller 8 is arranged in the region of the deflection roller 7a above the deposit belt 7 and exerts a limited pressure on the endless filaments 3. In contrast to a calender, the roller 8 is moved to the storage belt 7 on a nip. Because the storage belt 7 yields elastically, the endless filaments 3 are guided around the roller 8 with a small wrap angle, so that there is increased friction between the endless filaments 3 and the roller 8, which withstands a limited tensile load. So much tension can be built up to guide the endless filaments 3 over the gusset between the storage belts 4 and 7 without them sagging and at the same time detaching from the endless belt 4, since the dry driving style can lead to the gluing of endless filaments 3 and endless belt 4 . At the same time, compression or compacting of the continuous filaments is avoided, so that subsequent pre-consolidation by means of water jet consolidation at low pressure is possible. For this purpose, it is advantageous if the storage belt 7 with a slightly higher Speed is operated as the storage belt 4. Preferably, the speed difference can be up to 0.5%. The roller 8 can be permeable to air or have a smooth closed jacket. Alternatively, the roller 8 can also have a structured surface in order to increase the friction with the endless filaments 3. The roller 8 can be rotating or driven. The pressure by the roller 8 on the endless filaments 3 and the storage belt 7, in conjunction with the high transport speed, reduces the low sag in the gusset between the first and the second storage belt 4, 7. The roller 8 can be arranged so that it can be printed with the deflecting roller 7a or with the storage belt 7 exerts on the endless filaments 3 and this clamps slightly (with a defined gap). If the roller 8 is driven, a warpage of, for example, 2-5% of the continuous filaments 3 lying on top of one another can be set with the deposit belt 7 or the deflection roller 7a. Given the high transport speed of the continuous filaments 3, it can be advantageous to design and vacuum the roller 8 as an air-permeable roller, since this allows undesired entrained air flows to be derived. If both storage belts 4, 7 are operated at an identical speed, the roller 8 can be operated at a slightly higher speed than the storage belt 7. The peripheral speed can be up to 0.5% greater than the transport speed of the storage belt 7 the endless filaments 3 are pushed onto the storage belt 7, so that the sag of the endless filaments 3 in the gusset between the storage belts 4, 7 is reduced.

Nach der Übergabe der Endlosfilamente 3 auf das zweite Ablageband 7 erfolgt mittels eines Düsenbalkens 9 eine erste Verfestigung der Endlosfilamente zu einem Vlies 11. Der Düsenbalken kann mit einem geringen Druck von beispielsweise 10 - 40 bar betrieben werden, um nur eine Vorverfestigung zu erzielen. Hierzu ist unterhalb des Ablagebandes 7 ein Saugkasten 10 angeordnet, mit dem das Wasser des Düsenbalkens 9 durch das Ablageband 7 abgesaugt wird. Die durch den ersten Düsenbalken 9 erfolgte Verfestigung kann vorteilhafterweise sehr leicht sein, damit auf den nachfolgenden Saugtrommel gleichzeitig noch eine Strukturierung stattfinden kann. Erfolgt keine anschließende Strukturierung, kann der Düsenbalken 9 auch mit einem höheren Druck von beispielsweise 40 - 400 bar betrieben werden. Von dem Ablageband 7 wird das Vlies 11 um eine erste Saugtrommel 12 gefördert, die oberhalb des Ablagebandes 7 angeordnet ist. Mindestens ein weiterer Düsenbalken 13 beaufschlagt das Vlies 11 mit einem hohen Druck von 40-400 bar, um dem Vlies 11 eine ausreichende Festigkeit und ggfs. eine Strukturierung zu geben. Die Strukturierung erfolgt in der Regel über eine Musterung der Saugtrommel 12, über die eine Schale mit einem prägenden Muster aufgezogen werden kann. Nach einem Umlauf von ca. 180° um die erste Saugtrommel 12 erfolgt ein weiterer Umlauf um eine zweite Saugtrommel 14, auf der mindestens ein weiterer Düsenbalken 15 das Vlies ebenfalls mit einem hohen Druck von 40-400 bar verfestigt und gegebenenfalls abschließend noch einmal strukturiert. Eine Weiterbehandlung des Vlieses 11 in einer nachfolgenden Anlage zum Präparieren, Trocknen und/oder Aufwickeln ist in dieser Ansicht nicht mehr dargestellt, gehört aber zum gesamten Anlagenkonzept.After the continuous filaments 3 have been transferred to the second deposit belt 7, the continuous filaments are first solidified to form a fleece 11 by means of a nozzle bar 9. The nozzle bar can be operated at a low pressure of, for example, 10-40 bar, only to to achieve pre-consolidation. For this purpose, a suction box 10 is arranged below the storage belt 7, with which the water of the nozzle bar 9 is sucked off through the storage belt 7. The solidification carried out by the first nozzle bar 9 can advantageously be very light, so that structuring can take place simultaneously on the subsequent suction drum. If there is no subsequent structuring, the nozzle bar 9 can also be operated at a higher pressure of, for example, 40-400 bar. The fleece 11 is conveyed from the storage belt 7 around a first suction drum 12, which is arranged above the storage belt 7. At least one further nozzle bar 13 applies a high pressure of 40-400 bar to the fleece 11 in order to give the fleece 11 sufficient strength and, if necessary, structuring. The structuring is generally carried out by patterning the suction drum 12, by means of which a shell with a distinctive pattern can be drawn up. After a rotation of approximately 180 ° around the first suction drum 12, there is a further rotation around a second suction drum 14, on which at least one further nozzle bar 15 also solidifies the fleece at a high pressure of 40-400 bar and, if appropriate, finally structures it again. A further treatment of the fleece 11 in a subsequent system for preparation, drying and / or winding is no longer shown in this view, but is part of the overall system concept.

Das Ausführungsbeispiel der Figur 2 unterscheidet sich von dem vorherigen Ausführungsbeispiel nur in drei Punkten: die Walze 8 kann horizontal verfahrbar mittels Gleitleisten angeordnet sein. Da das Ablageband 7 nach der Umlenkrolle 7a aufgrund seiner Dehnung vertikal nachgiebig ist, kann durch ein horizontales Verfahren der Walze 8 von der Umlenkrolle 7a in Richtung Saugkasten 10 der Spalt zwischen Ablageband 7 und Walze 8 variiert werden, was den Umschlingungswinkel der Endlosfilamente 3 um die Walze 8 ändert und damit die verbundene Reibkraft. In diesem Ausführungsbeispiel ist ein weiterer Düsenbalken 16 unterhalb der Saugtrommel 12 und unterhalb des Ablagebandes 7 angeordnet, um eine erste Kompaktierung durch das Ablageband 7 zu erzielen und ggfs. eine Ablösung des vorverfestigten Vlieses 11 vom Ablageband 7 zu unterstützen. Eine weitere Verbesserung der Anlage 1 kann dadurch erreicht werden, indem zumindest eine Umlenkrolle, in diesem Beispiel die Umlenkrolle 7a, verschiebbar angeordnet ist, um die Spannung vom Ablageband 7 zu reduzieren und damit den Austausch der Ablagebänder zu vereinfachen. Diese drei Varianten lassen sich mit jedem Ausführungsbeispiel kombinieren.The embodiment of the Figure 2 differs from the previous exemplary embodiment only in three points: the roller 8 can be arranged to be horizontally movable by means of slide strips. Since the storage belt 7 after the deflection roller 7a is vertically flexible due to its expansion, the gap between the storage belt 7 and the roller 8 can be varied by moving the roller 8 horizontally from the deflection roller 7a in the direction of the suction box 10, which reduces the wrap angle of the endless filaments 3 by Roller 8 changes and thus the associated frictional force. In this exemplary embodiment, a further nozzle bar 16 is arranged below the suction drum 12 and below the storage belt 7 in order to achieve a first compacting by the storage belt 7 and, if necessary, to assist detachment of the pre-consolidated fleece 11 from the storage belt 7. A further improvement of the system 1 can be achieved in that at least one deflecting roller, in this example the deflecting roller 7a, is arranged displaceably in order to reduce the tension from the depositing belt 7 and thus to simplify the replacement of the depositing belts. These three variants can be combined with any embodiment.

In den Ausführungsbeispielen der Figuren 1 und 2 können beide Ablagebänder 4, 7 mit einer identischen Geschwindigkeit betrieben werden. Hierzu muss die Walze 8 mit einer leicht höheren Umfangsgeschwindigkeit betrieben werden, als das Ablageband 7. Die Umfangsgeschwindigkeit kann bis zu 0,5% größer sein, als die Transportgeschwindigkeit des Ablagebandes 7. Damit werden die Endlosfilamente 3 auf dem Ablageband 7 angeschoben, so dass sich der Durchhang der Endlosfilamente 3 im Zwickel zwischen den Ablagebändern 4, 7 reduziert. Alternativ kann auch ein Strecken der Endlosfilamente 3 erfolgen, wenn die Walze 8 mit einer größeren Geschwindigkeit von 2-5 % betrieben wird.In the embodiments of the Figures 1 and 2nd Both storage belts 4, 7 can be operated at an identical speed. For this purpose, the roller 8 must be operated at a slightly higher peripheral speed than the storage belt 7. The peripheral speed can be up to 0.5% greater than the transport speed of the storage belt 7. The continuous filaments 3 are pushed onto the storage belt 7 so that the sag of the endless filaments 3 in the gusset between the storage belts 4, 7 is reduced. Alternatively, the endless filaments 3 can also be stretched if the roller 8 is operated at a higher speed of 2-5%.

Wird das Ablageband 7 mit einer höheren Geschwindigkeit betrieben als das Ablageband 4, beispielsweise mit bis zu 0,5%, kann die Walze 8 als nicht angetriebene mitlaufende Walze 8 ausgebildet sein. Alternativ kann sie auch angetrieben sein, um mit einem positiven oder negativen Verzug von 2-3% auf die Endlosfilamente 3 zu wirken.If the deposit belt 7 is operated at a higher speed than the deposit belt 4, for example at up to 0.5%, the roller 8 can be designed as a non-driven idling roller 8. Alternatively, it can also be driven in order to act on the continuous filaments 3 with a positive or negative delay of 2-3%.

In dem Ausführungsbeispiel der Figur 3 ist die Walze 8 im Endbereich des Ablagebandes 4 angeordnet, und zwar möglichst so, dass die Walze mit der Umlenkrolle 4b zusammenwirkt. An dieser Stelle bildet die Walze 8 mit dem Ablageband 4 einen Spalt, wodurch aufgrund eines kleinen Umschlingungswinkels eine Reibkraft auf die Endlosfilamente 3 wirkt, so dass in Verbindung mit der Umschlingung der Endlosfilamente 3 um die Saugtrommeln 12, 14 eine leichte Zugspannung auf die Endlosfilamente 3 wirkt, so dass diese nicht in den Zwickel zwischen den Ablagebändern 4 und 7 durchhängen. Vorteilhafterweise kann auch hier die Walze 8 als luftdurchlässige und besaugte Walze ausgebildet sein, um die Schleppluft aus der Anlage zu entfernen. Weiterhin wurde hier das Ablageband 7 modifiziert und eine weitere Umlenkrolle 7e eingefügt, um im Bereich des Zwickels Platz für eine weitere Anwendung zu schaffen, beispielsweise für einen Wickel 17 für ein kardiertes Vlies, um dies mit den Endlosfilamenten auf dem zweiten Ablageband 7 zu kombinieren. Um Platz für die Inbetriebnahme oder einen Wechsel des Ablagebandes 7 zu schaffen, ist auch hier die Umlenkrolle 7a zumindest horizontal verschiebbar angeordnet. Die Geschwindigkeit der Ablagebänder 4 und 7 kann in diesem Ausführungsbeispiel identisch sein oder die Geschwindigkeit des Ablagebandes 7 kann geringfügig über der Geschwindigkeit des Ablagebandes 4 liegen. Der Zug auf die Endlosfilamente 3 wird entweder durch die Umschlingung und damit Reibung mit der Walze 8 erzeugt, oder durch die höhere Geschwindigkeit des Ablagebandes 7. Damit kann die Walze nicht angetrieben und mitlaufend ausgeführt werden. Alternativkann die Walze 8 angetrieben werden, um mit dem Ablageband 4 einen positiven oder negativen Verzug von 2-5% einzustellen, so dass entweder die Walze 8 schneller oder langsamer angetrieben wird.In the embodiment of the Figure 3 the roller 8 is arranged in the end region of the deposit belt 4, in such a way that the roller interacts with the deflection roller 4b. At this point, the roller 8 with the storage belt 4 a gap, whereby due to a small wrap angle, a frictional force acts on the endless filaments 3, so that in connection with the wrap of the endless filaments 3 around the suction drums 12, 14, a slight tensile stress acts on the endless filaments 3, so that they do not become hang the gusset between the storage straps 4 and 7. Here, too, the roller 8 can advantageously be designed as an air-permeable and vacuumed roller in order to remove the drag air from the system. Furthermore, the storage belt 7 was modified and a further deflection roller 7e was inserted in order to create space for a further application in the area of the gusset, for example for a winding 17 for a carded fleece, in order to combine this with the continuous filaments on the second storage belt 7. In order to make room for the commissioning or a replacement of the storage belt 7, the deflection roller 7a is also arranged at least horizontally displaceable here. The speed of the storage belts 4 and 7 can be identical in this exemplary embodiment or the speed of the storage belt 7 can be slightly above the speed of the storage belt 4. The tension on the endless filaments 3 is either generated by the wrapping and thus friction with the roller 8, or by the higher speed of the deposit belt 7. The roller cannot be driven and run in unison. Alternatively, the roller 8 can be driven in order to set a positive or negative distortion of 2-5% with the deposit belt 4, so that either the roller 8 is driven faster or slower.

Die Erfindung beschränkt sich in ihrer Ausführung nicht auf das vorstehend angegebene bevorzugte Ausführungsbeispiel. Vielmehr ist eine Anzahl von Varianten denkbar, welche von der dargestellten Lösung auch bei grundsätzlich anders gearteten Ausführungen Gebrauch macht. Sämtliche aus den Ansprüchen, der Beschreibung oder den Zeichnungen hervorgehenden Merkmale und/oder Vorteile, einschließlich konstruktiver Einzelheiten oder räumlicher Anordnungen, können sowohl für sich als auch in den verschiedensten Kombinationen erfindungswesentlich sein.The embodiment of the invention is not limited to the preferred exemplary embodiment specified above. Rather, a number of variants are conceivable which make use of the solution shown, even in the case of fundamentally different types. All features and / or advantages arising from the claims, the description or the drawings, including constructive Details or spatial arrangements can be essential to the invention both individually and in a wide variety of combinations.

BezugszeichenReference numerals

11
Anlageinvestment
22nd
Spinnerette mit DiffusorSpinnerette with diffuser
33rd
EndlosfilamenteContinuous filaments
44th
AblagebandStorage belt
4a - 4d4a - 4d
UmlenkrollenPulleys
55
SaugkastenSuction box
66
SaugkastenSuction box
77
AblagebandStorage belt
7a - 7e7a - 7e
UmlenkrollenPulleys
88th
Walzeroller
99
DüsenbalkenNozzle bar
1010th
SaugkastenSuction box
1111
SpinnvliesSpunbond
1212th
SaugtrommelSuction drum
1313
DüsenbalkenNozzle bar
1414
SaugtrommelSuction drum
1515
DüsenbalkenNozzle bar
1616
DüsenbalkenNozzle bar
1717th
WickelWrap

Claims (20)

  1. An installation (1) for producing a spun-bonded web, comprising a spinnerette with a diffusor (2) for producing endless filaments (3), with a first discharge belt (4), which is formed to transport the endless filaments (3) and to transfer them to a subsequent second discharge belt (7), wherein at least one device for the water jet entangling (9) of the endless filaments (3) to a spun-bonded web (11) is disposed at the second discharge belt (7), wherein in the following the spun-bonded web (11) is entangled and/or textured by means of at least one further water jet entangling (13, 15), wherein the first discharge belt (4) transports the endless filaments (3) in a dry and untangled condition, wherein a roll (8) is disposed at the start of the second discharge belt (7) or at the end of the first discharge belt (4), characterized in that the endless filaments are guided around the roll (8) at a smaller wrap angle of up to 45°, in order to reduce the sagging of the endless filaments (3) in the nip between the first and the second discharge belt (4, 7).
  2. The installation according to claim 1, characterized in that the discharge belts (4, 7) transport the endless filaments at a speed of at least 250 m/min, preferably of at least 400 m/min.
  3. The installation according to claim 1, characterized in that the roll (8) is formed to be air-permeable and suctionable.
  4. The installation according to claim 1, characterized in that the discharge belts (4, 7) are operated at the same speed.
  5. The installation according to claim 1, characterized in that the second discharge belt (7) is operated at a higher speed than the first discharge belt (4).
  6. The installation according to any of the preceding claims, characterized in that the roll (8) is drivable.
  7. The installation according to claim 6, characterized in that a speed difference of up to 5 % is adjustable between the circumferential speed of the roll (8) and the transport speed of the discharge belt (4) or (7).
  8. The installation according to any of the preceding claims, characterized in that, in the area of the discharge belt (7), at least one suction roll (12) is disposed with at least one water jet entangling, which picks up the spun-bonded web (11) from the discharge belt (7) and continues to transports it.
  9. The installation according to claim 8, characterized in that, in the area of the suction drum (12), underneath the discharge belt (7), a nozzle bar (16) is disposed, which is formed to loosen the spun-bonded web (11) from the discharge belt (7).
  10. The installation according to any of the preceding claims 1 to 7, characterized in that the roll (8) is formed to travel horizontally, respectively parallel to the discharge belt (4) or (7).
  11. The installation according to any of the preceding claims, characterized in that the discharge belts (4, 7) are formed as continuously circulating discharge belts, which are guided by means of respectively two deflector pulleys, wherein at least one deflector pulley is displaceably formed.
  12. The installation according to any of the preceding claims, characterized in that the area between the discharge belts (4, 7) is formed to accommodate a further installation component.
  13. A method for producing a spun-bonded web from endless filaments, which are produced in a spinnerette with a diffusor and are discharged onto a first discharge belt (4), wherein the first discharge belt (4) transports the endless filaments to a second discharge belt (7) and transfers them to said belt, wherein the endless filaments are entangled to a spun-bonded web (11) on the second discharge belt (7) by means of water jet entangling (9) and subsequently are entangled and/or textured by means of at least one further water jet entangling (13, 15), wherein the endless filaments are transported on the first discharge belt (4) in a dry and non-entangled condition, characterized in that the endless filaments at least partially wrap around a roll (8) at up to 45°, which is disposed at the end of the first discharge belt (4) or at the beginning of the second discharge belt (7), in order to reduce the sagging of the endless filaments (3) in the nip between the first and the second discharge belts (4, 7).
  14. The method according to claim 13, characterized in that the endless filaments are transported at a speed of at least 250 m/min, preferably of at least 400 m/min.
  15. The method according to claim 13, characterized in that the roll (8) is formed to be air-permeable and is suctioned.
  16. The method to claim 13, characterized in that the discharge belts (4, 7) are operated at the same speed.
  17. The method according to claim 13, characterized in that the second discharge belt (7) is operated at a higher speed than the first discharge belt (4).
  18. The method according to claim 13, characterized in that the roll is driven.
  19. The method according to claim 18, characterized in that a speed difference of up to 5 % is adjustable between the circumferential speed of the roll (8) and the transport speed of the discharge belt (4) or (7).
  20. The method according to claim 13 to 19, characterized in that the roll (8) is displaceable horizontally, respectively parallel to the discharge belt (4) or (7).
EP18201508.1A 2017-12-08 2018-10-19 System and method for creating a spunbonded fabric Active EP3495543B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017129300.0A DE102017129300A1 (en) 2017-12-08 2017-12-08 Plant and method for producing a spunbonded nonwoven

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TW202140884A (en) * 2019-12-17 2021-11-01 奧地利商蘭仁股份有限公司 Process for the production of spunbonded nonwoven
PL4001488T3 (en) * 2020-11-19 2024-08-19 Reifenhäuser GmbH & Co. KG Maschinenfabrik Device for the manufacture of non-woven fabrics from continuous filaments
DE102021107902A1 (en) * 2021-03-29 2022-09-29 Andritz Küsters Gmbh Plant for consolidating at least one wet-laid or dry-laid fiber layer to form a fleece web, with a conveyor that includes a circulating belt with an upper run, on which the at least one fiber layer can be placed and displaced in a production direction

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JP2004518029A (en) * 2001-01-12 2004-06-17 ポリマー・グループ・インコーポレーテツド Hydro-entanglement treatment of polymer continuous filaments
FR2845698B1 (en) 2002-10-11 2005-03-18 Rieter Perfojet PROCESS AND INSTALLATION FOR PRODUCING A NON-WOVEN HAVING GOOD PROPERTIES OF TENSILE STRENGTH
FR2861751B1 (en) * 2003-10-31 2006-01-06 Rieter Perfojet MACHINE FOR THE PRODUCTION OF MULTIPLE QUALITY NUTS.
PL1967628T5 (en) 2007-03-08 2014-04-30 Truetzschler Nonwovens Gmbh Method and device for producing spinning fleece

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DE102017129300A1 (en) 2019-06-13

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