EP2009163A1 - Method for manufacturing non woven material - Google Patents

Method for manufacturing non woven material Download PDF

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Publication number
EP2009163A1
EP2009163A1 EP07012793A EP07012793A EP2009163A1 EP 2009163 A1 EP2009163 A1 EP 2009163A1 EP 07012793 A EP07012793 A EP 07012793A EP 07012793 A EP07012793 A EP 07012793A EP 2009163 A1 EP2009163 A1 EP 2009163A1
Authority
EP
European Patent Office
Prior art keywords
diverging
cooling chamber
filaments
channel walls
section
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP07012793A
Other languages
German (de)
French (fr)
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EP2009163B1 (en
Inventor
Hans-Georg Geus
Detlef Frey
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Reifenhaeuser GmbH and Co KG Maschinenenfabrik
Original Assignee
Reifenhaeuser GmbH and Co KG Maschinenenfabrik
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Reifenhaeuser GmbH and Co KG Maschinenenfabrik filed Critical Reifenhaeuser GmbH and Co KG Maschinenenfabrik
Priority to DK07012793.1T priority Critical patent/DK2009163T3/en
Priority to ES07012793.1T priority patent/ES2440244T3/en
Priority to EP07012793.1A priority patent/EP2009163B1/en
Priority to PL07012793T priority patent/PL2009163T3/en
Priority to IL192000A priority patent/IL192000A/en
Priority to CA2635329A priority patent/CA2635329C/en
Priority to JP2008165256A priority patent/JP5094588B2/en
Priority to US12/146,573 priority patent/US7762800B2/en
Priority to CN2008101317808A priority patent/CN101333730B/en
Priority to BRPI0803610-1A priority patent/BRPI0803610B1/en
Publication of EP2009163A1 publication Critical patent/EP2009163A1/en
Application granted granted Critical
Publication of EP2009163B1 publication Critical patent/EP2009163B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/16—Non-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 filaments produced in association with filament formation, e.g. immediately following extrusion
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/08—Melt spinning methods
    • D01D5/098—Melt spinning methods with simultaneous stretching
    • D01D5/0985—Melt spinning methods with simultaneous stretching by means of a flowing gas (e.g. melt-blowing)

Definitions

  • the invention relates to a device for producing spunbonded non-wovens from filaments.
  • the filaments are usually made of thermoplastic material.
  • the filaments are first spun using a spinning device and then passed through a cooling chamber usually. Following the cooling, the filaments enter the filament bundle and enter the drawing channel of a drawing unit in which the filaments are aerodynamically stretched.
  • the gap width of the stretching channel in the machine direction or in the conveying direction of the spunbonded nonwoven is normally 10 to 20 mm here. Due to these relatively small geometric gap dimensions, the filament bundle is compacted relatively strong in the drawing unit. This has the disadvantageous consequence that the filaments are relatively difficult to separate again in many known systems and can be deposited as individual filaments.
  • the invention is based on the technical problem of specifying a device of the aforementioned type, with which the filament bundle produced can be separated into single filaments in a simple and effective manner, which individual filaments can then be deposited to form the spunbonded nonwoven web.
  • the invention teaches a device for the continuous production of spunbonded filaments, wherein a spinning device is provided for the production of the filaments, wherein the spinning device is followed by a cooling chamber in which process air is supplied for cooling the filaments, wherein a stretching unit for the drawing of the filaments is connected to the cooling chamber, and wherein the connection region between the cooling chamber and drawing unit is designed to be closed, wherein the drawing unit has a drafting channel whose channel walls are divergently arranged / formed over at least part of the length of the drawing channel and wherein a depositing device is provided for depositing the filaments to the spunbonded nonwoven web.
  • Spinning means in particular a spinnerette for spinning the filaments. These spun filaments are then passed through the cooling chamber, in which the cooling of the filaments takes place.
  • the cooling chamber is a closed chamber which, apart from the process air supply and apart from the inlet opening and outlet opening, is closed or essentially closed for the filament family.
  • the connection region between the cooling chamber and the stretching unit is designed to be closed. In the connection region or transition region between the cooling chamber and the stretching unit, therefore, according to the invention, there is no supply of air or substantially no supply of air into the system or into the flow path of the filaments.
  • channel walls of the drawing channel are designed to be divergent means, within the scope of the invention, in particular that the channel walls arranged transversely to the machine direction or transversely to the conveying direction of the spunbonded web are arranged / formed divergently.
  • the distance between these channel walls increases in this diverging section in the direction of the depositing device out.
  • the length of the drawing channel also refers to the extension of the drawing channel between the cooling chamber and the laying device.
  • the diverging part of the stretching channel will also be referred to below as a diverging Verstreckkanalab Songs or short as a diverging section.
  • a very preferred embodiment of the invention is characterized in that the cooling chamber is subdivided into at least two cooling chamber sections, in which the filaments can each be cooled with process air of different temperature.
  • This particular embodiment has proven particularly useful in the context of the invention.
  • the temperature of the supplied process air in the first upper cooling chamber section is higher than the temperature of the supplied process air in the lower second cooling chamber section.
  • First upper cooling chamber section refers to the cooling chamber section into which the filaments enter first.
  • connection region between the cooling chamber and the stretching unit is designed to be closed.
  • the drafting unit is thus connected to the cooling chamber with the proviso that no air inlet or substantially no air inlet takes place in the connection area between the cooling chamber and the drafting unit.
  • the stretching unit can be connected directly to the cooling chamber and free of air supply gaps.
  • an intermediate channel is arranged between the cooling chamber and the drawing unit. It is within the scope of the invention that in this intermediate channel no air from the outside or substantially no air is introduced from the outside. This means that in the intermediate channel only the process air is introduced from the cooling chamber and otherwise no air supply or substantially no air supply from the outside.
  • the intermediate channel extends converging from the cooling chamber to the drawing unit.
  • the transversely to the machine direction or transversely to the conveying direction of the spunbonded web arranged intermediate channel walls are arranged converging.
  • the intermediate channel thus tapers from the cooling chamber to the drawing unit.
  • different convergence angles of the intermediate channel can be set. It is within the scope of the invention that the lower end of the intermediate channel is connected to the drawing channel of the drawing unit in an air-feed gap-free manner or substantially free of air feed gap. Then only the process air (with the filaments) and otherwise no additional air or substantially no additional air from the intermediate channel into the Verstreckkanal.
  • the air injection is expediently with the proviso that the filament bundle is widened in the machine direction or in the conveying direction of the spunbonded web.
  • the procedure is preferably such that the opening angle of the filament bundle of 0.1 to 10 °, preferably from 0.1 to 1 ° can be achieved.
  • the statement "at the beginning of the diverging Verstreckkanalabites” means in particular that with respect to the length of divergent Verstreckkanalabimposings first third, preferably the first quarter and more preferably the first fifth of the diverging Verstreckkanalabroughs.
  • the distance of the channel walls of the drawing channel is suitably 5 to 30 mm, preferably 8 to 25 mm and preferably 10 to 20 mm.
  • At least a quarter, preferably at least one third, of the length of the drawing channel is divergent or designed as a diverging section.
  • at least 40% of the length of the drawing channel is divergent or designed as a diverging section.
  • the Verstreckkanal over a portion of its length parallel channel walls (parallel section) and at this parallel section then connect diverging channel walls (divergent section). It is within the scope of the invention that the Verstreckkanal consists in this embodiment exclusively of said parallel section and the adjoining diverging section. The additional air supply takes place in this embodiment either at the end of the parallel section or at the beginning of the diverging section of the Verstreckkanals.
  • the end of the parallel section means, in particular, the last third, preferably the last quarter, and very preferably the last fifth, of the parallel section, with respect to the length of the parallel section.
  • the divergent section means here and below in particular the first third with respect to the length of the diverging section, preferably the first quarter, and very preferably the first fifth of the diverging section.
  • the diverging portion of this embodiment is longer than the parallel portion, and the diverging portion is desirably at least 1.5 times as long as the parallel portion.
  • the drafting channel has converging channel walls over a part of its length (converging section) and adjoining the diverging channel walls (divergent section).
  • the Verstreckkanal in this embodiment consists solely of the convergent and the diverging section.
  • the diverging section thus directly adjoins the convergent section.
  • the additional air supply in this embodiment is expediently carried out in the transition region between the convergent section and diverging section or at the beginning of the diverging section.
  • the diverging portion is longer than the converging portion, and preferably, the diverging portion is at least 1.5 times as long as the converging portion.
  • the drafting channel has converging channel walls over a part of its length (converging section), connecting thereto parallel channel walls (parallel section) and, in turn, connecting divergent channel walls (diverging section).
  • the drafting channel here consists exclusively of the convergent section, the adjoining parallel section and the subsequent diverging section. Basically, to the the last mentioned diverging section but also a second parallel section.
  • the additional air supply in this embodiment is expediently carried out at the end of the (first) parallel section or at the beginning of the divergent section.
  • End of the parallel section means with respect to the length of the parallel section in particular the last third, preferably the last quarter and very preferably the last fifth of the parallel section.
  • the divergent section be the longest channel section. This means that the divergent section is longer than the parallel section and longer than the convergent section. According to a particularly recommended embodiment variant, the divergent section is longer than the entire channel section of converging and parallel section.
  • the diverging channel walls of the diverging portion are arranged symmetrically with respect to a vertically extending through the Verstreckkanal center plane.
  • the diverging channel walls can be arranged asymmetrically with respect to this center plane. Then one of the two diverging channel walls would then have a greater inclination or inclination than the other opposing channel wall.
  • the divergence angle of the diverging section remains constant over the length of the diverging section. In principle, however, it is also possible for the divergence angle to change over the length of the divergent section.
  • the cooling chamber and drawing unit of the device according to the invention form a closed unit.
  • the air supply is limited in the aggregate of cooling chamber and Stretching at least substantially on the introduction of the process air in the cooling chamber on the one hand and on the additional air supply before the diverging section or at the beginning of the diverging section in the Verstreckkanal other hand.
  • air with the filament bundle can reach the cooling chamber from above.
  • a particular embodiment of the invention has special significance in the context of the invention is characterized in that the extension unit is followed by a laying unit with at least one diffuser.
  • the filaments or the filament bundle are thus guided after the drawing unit through at least one diffuser.
  • a diffuser has at least partially diverging diffuser walls. The diffuser walls are arranged transversely to the machine direction or transversely to the conveying direction of the spunbonded web.
  • the laying unit consists of a first diffuser and an adjoining second diffuser.
  • an ambient air inlet gap is provided between the first diffuser and the second diffuser. Due to the exit pulse from the first diffuser, air is drawn in from the environment through this ambient air inlet gap.
  • the width of the ambient air inlet gap is adjustable.
  • the depositing device of the device according to the invention is a continuously moving Ablegesiebband for the spunbonded web.
  • at least one suction device is provided under the Ablegesiebband, with the air through the Ablegesiebband is sucked.
  • the invention is based on the finding that with the device according to the invention, very high quality spunbonded nonwovens can be produced, which are characterized in particular by a homogeneous structure and homogeneous properties distinguished.
  • the invention is based in particular on the finding that undesirable compaction of the filament bundle can be avoided by the inventive design of the stretching unit, or that compacting already carried out can be largely reversed.
  • an effective separation into individual filaments can take place.
  • the embodiment according to the invention is thus achieved that a high number of filaments in the form of individual filaments can be stored.
  • the quality of the spunbonded nonwoven produced according to the invention can be considerably increased in comparison to spunbonded nonwovens produced with known devices.
  • the success of the invention can be realized by relatively simple and cost-effective measures. As a result, high-quality spun-bonded nonwovens having uniform or homogeneous structural properties can be obtained.
  • the figures show an apparatus for the continuous production of spunbonded nonwovens from aerodynamically stretched filaments of thermoplastic material.
  • the device has a spinnerette 1 for producing the filaments.
  • the spinnerette 1 is connected downstream of a cooling chamber 2, is supplied in the process air for cooling the filaments.
  • the cooling chamber 2 is preferably and in the exemplary embodiment divided into two cooling chamber sections 3, 4, in which the filaments are each cooled with process air of different temperature.
  • the temperature of the process air with which the filaments in the first upper cooling chamber section 3 are applied is higher than the temperature of the process air with which the filaments in the second lower cooling chamber section 4 are acted upon.
  • a stretching unit 5 is connected for the aerodynamic stretching of the filaments.
  • the cooling chamber 2 is connected via an intermediate channel 6 with the drawing unit 5.
  • the connection region between the cooling chamber 2 and the stretching unit 5 is formed closed according to the invention. This means that in this transition region and in particular in the region of the intermediate channel 6 no air or substantially no air is introduced from the outside into the flow path of the filaments.
  • the intermediate channel 6 extends from the cooling chamber 2 to the stretching unit 5 converging. In other words, the intermediate channel 6 tapers from the cooling chamber 2 to the stretching unit 5.
  • the drawing unit 5 has a drawing channel 7, the channel walls 8, 9 of which are arranged divergently over at least part of the length of the drawing channel 7.
  • the channel walls 8, 9 thus form at least one diverging section 10, in which the distance of the Canal walls 8, 9 enlarged towards the bottom.
  • These channel walls 8, 9 are the channel walls 8, 9 of the stretching channel 7 which are arranged transversely to the machine direction or transversely to the conveying direction of the spunbonded nonwoven fabric.
  • the conveying direction of the spunbonded nonwoven fabric is in Fig. 1 indicated by a double arrow.
  • a laying unit 11 which preferably and in the exemplary embodiment consists of a first diffuser 12 and a second diffuser 13.
  • an ambient air inlet gap 14 is provided between the first diffuser 12 and the second diffuser 13.
  • Each diffuser 12, 13 has an upper converging part and a lower diverging part. Accordingly, each diffuser 12, 13 has a narrowest point between the upper converging part and the lower diverging part.
  • the diffuser walls in the diverging part of the first diffuser 12 and / or the second diffuser 13 are adjustable, so that the opening angle of the respective diverging part is adjustable.
  • Ablegesiebband 15 is provided as a depositing device for the spunbonded web. Under this Ablegesiebband 15 suitably at least one suction device not shown in the figures is provided with the air in a conventional manner by the Ablegesiebband 15 can be sucked.
  • FIGS. 2 to 5 preferred embodiments for the embodiment of the drawing channel 7 of the drawing unit 5 are shown.
  • additional air is blown into the drafting channel 7 at the beginning of the diverging Verstreckkanalab Songs or at the beginning of the diverging section 10 or just before the diverging section.
  • the introduction of the air takes place expediently in Direction of movement of the filaments or of the filament bundle and preferably tangentially to the filaments or to the filament bundle.
  • the air injection preferably takes place from both opposite channel walls 8, 9 and at the same height of the drawing unit 5.
  • the air is blown in with the proviso that the filament bundle is widened, wherein the opening angle of the filament bundle is preferably 0.1 to 1 °.
  • This expansion of the filament bundle is in the FIGS. 2 to 5 been hinted at. - As far as here and below the beginning of the diverging section 10 is mentioned, this means in relation to the length of the diverging section 10 in particular the first third, preferably the first quarter and very preferably the first fifth of the diverging section 10th
  • Fig. 2 shows a first embodiment of the drawing unit 5 according to the invention, in which the Verstreckkanal 7 over its entire length diverging channel walls 8, 9 has.
  • the entire Verstreckkanal 7 is formed diverging.
  • the air supply takes place here at the beginning of the diverging Verstreckkanals 7.
  • the channel walls 8, 9 are arranged symmetrically with respect to the center plane M.
  • the divergence angle between the channel walls 8, 9 remains constant over the length of the Verstreckkanals 7.
  • the Verstreckkanal 7 initially has a parallel section 16 with parallel channel walls 8, 9, to which then the diverging section 10 connects.
  • the air supply takes place here at the beginning of this diverging section 10.
  • the diverging portion 10 is formed longer than the parallel portion 16 and in about twice as long.
  • the channel walls 8, 9 in the diverging section 10 symmetrical with respect to Middle plane M arranged and the Divergenzwinkel remains constant over the length of the diverging portion 10.
  • Fig. 4 shows an embodiment in which the Verstreckkanal 7 first has a converging portion 17 with converging channel walls 8, 9, then immediately followed by the diverging portion 10.
  • the air supply is also here at the beginning of the diverging section 10.
  • the diverging section 10 is in the embodiment according to Fig. 4 longer than the converging section 17, and about twice as long.
  • Fig. 5 1 shows an embodiment of the drawing unit 5, in which the drawing channel 7 initially has a convergent section 17 with converging channel walls 8, 9, to which a parallel section 16 adjoins.
  • the divergent section 10 then directly adjoins the parallel section 16.
  • the air supply is also here at the beginning of the diverging section 10.
  • the length of the diverging section 10 is greater than the length of the remaining Verstreckkanals 7 of converging section 17 and parallel section 16 in the embodiment.
  • the channel walls 8, 9 are symmetrical with respect the median plane M arranged. The divergence angle remains constant over the length of the diverging section 10.

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

Abstract

The apparatus has a unit for supplying cool process air to a cooling chamber (2) to cool a set of filaments as they pass downwards through the cooling chamber. A laterally closed stretching unit (5) downstream of the cooling chamber has laterally closed side walls that have downwardly diverging portions. A connecting region between the stretching unit and the cooling chamber excludes access of air from outside to the filaments as they pass from the cooling chamber to the stretching unit, where the filaments drop from the stretching unit into a deposition belt (15).

Description

Die Erfindung betrifft eine Vorrichtung zur Herstellung von Spinnvliesen aus Filamenten. Die Filamente bestehen normalerweise aus thermoplastischem Kunststoff.The invention relates to a device for producing spunbonded non-wovens from filaments. The filaments are usually made of thermoplastic material.

Vorrichtungen der vorstehend genannten Art sind aus der Praxis in verschiedenen Ausführungsformen bekannt. Die Filamente werden zunächst mit Hilfe einer Spinneinrichtung ersponnen und dann in der Regel durch eine Kühlkammer geleitet. Im Anschluss an die Kühlung gelangen die Filamente bzw. gelangt das Filamentbündel in den Verstreckkanal einer Verstreckeinheit, in dem eine aerodynamische Verstreckung der Filamente erfolgt. Die Spaltbreite des Verstreckkanals in Maschinenrichtung bzw. in Förderrichtung des Spinnvlieses beträgt hier normalerweise 10 bis 20 mm. Aufgrund dieser relativ geringen geometrischen Spaltmaße wird das Filamentbündel in der Verstreckeinheit verhältnismäßig stark kompaktiert. Das hat die nachteilhafte Folge, dass sich die Filamente bei vielen bekannten Anlagen nur relativ schwierig wieder separieren und als Einzelfilamente ablegen lassen.Devices of the aforementioned type are known in practice in various embodiments. The filaments are first spun using a spinning device and then passed through a cooling chamber usually. Following the cooling, the filaments enter the filament bundle and enter the drawing channel of a drawing unit in which the filaments are aerodynamically stretched. The gap width of the stretching channel in the machine direction or in the conveying direction of the spunbonded nonwoven is normally 10 to 20 mm here. Due to these relatively small geometric gap dimensions, the filament bundle is compacted relatively strong in the drawing unit. This has the disadvantageous consequence that the filaments are relatively difficult to separate again in many known systems and can be deposited as individual filaments.

Der Erfindung liegt das technische Problem zugrunde, eine Vorrichtung der eingangs genannten Art anzugeben, mit der das erzeugte Filamentbündel auf einfache und effektive Weise in Einzelfilamente separiert werden kann, welche Einzelfilamente dann zur Spinnvliesbahn ablegbar sind.The invention is based on the technical problem of specifying a device of the aforementioned type, with which the filament bundle produced can be separated into single filaments in a simple and effective manner, which individual filaments can then be deposited to form the spunbonded nonwoven web.

Zur Lösung dieses technischen Problems lehrt die Erfindung eine Vorrichtung zur kontinuierlichen Herstellung von Spinnvliesen aus Filamenten, wobei eine Spinneinrichtung zur Erzeugung der Filamente vorgesehen ist,
wobei der Spinneinrichtung eine Kühlkammer nachgeschaltet ist, in der Prozessluft zur Kühlung der Filamente zugeführt wird,
wobei an die Kühlkammer eine Verstreckeinheit für die Verstreckung der Filamente angeschlossen ist und wobei der Anschlussbereich zwischen Kühlkammer und Verstreckeinheit geschlossen ausgebildet ist,
wobei die Verstreckeinheit einen Verstreckkanal aufweist, dessen Kanalwände zumindest über einen Teil der Länge des Verstreckkanals divergierend angeordnet/ausgebildet sind
und wobei eine Ablegeeinrichtung zur Ablage der Filamente zur Spinnvliesbahn vorgesehen ist.To solve this technical problem, the invention teaches a device for the continuous production of spunbonded filaments, wherein a spinning device is provided for the production of the filaments,
wherein the spinning device is followed by a cooling chamber in which process air is supplied for cooling the filaments,
wherein a stretching unit for the drawing of the filaments is connected to the cooling chamber, and wherein the connection region between the cooling chamber and drawing unit is designed to be closed,
wherein the drawing unit has a drafting channel whose channel walls are divergently arranged / formed over at least part of the length of the drawing channel
and wherein a depositing device is provided for depositing the filaments to the spunbonded nonwoven web.

Spinneinrichtung meint insbesondere eine Spinnerette zum Erspinnen der Filamente. Diese ersponnenen Filamente werden dann durch die Kühlkammer geleitet, in der die Kühlung der Filamente stattfindet. Es liegt im Rahmen der Erfindung, dass es sich bei der Kühlkammer um eine geschlossene Kammer handelt, die abgesehen von der Prozessluftzufuhr sowie abgesehen von der Einlassöffnung und Auslassöffnung für die Filamentschar geschlossen bzw. im Wesentlichen geschlossen ausgebildet ist. Erfindungsgemäß ist der Anschlussbereich zwischen Kühlkammer und Verstreckeinheit geschlossen ausgebildet. Im Anschlussbereich bzw. Übergangsbereich zwischen Kühlkammer und Verstreckeinheit findet also erfindungsgemäß keine Luftzufuhr oder im Wesentlichen keine Luftzufuhr in das System bzw. in den Strömungsweg der Filamente statt.Spinning means in particular a spinnerette for spinning the filaments. These spun filaments are then passed through the cooling chamber, in which the cooling of the filaments takes place. It is within the scope of the invention that the cooling chamber is a closed chamber which, apart from the process air supply and apart from the inlet opening and outlet opening, is closed or essentially closed for the filament family. According to the invention, the connection region between the cooling chamber and the stretching unit is designed to be closed. In the connection region or transition region between the cooling chamber and the stretching unit, therefore, according to the invention, there is no supply of air or substantially no supply of air into the system or into the flow path of the filaments.

Dass die Kanalwände des Verstreckkanals divergierend ausgebildet sind, meint im Rahmen der Erfindung insbesondere, dass die quer zur Maschinenrichtung bzw. quer zur Förderrichtung der Spinnvliesbahn angeordneten Kanalwände divergierend angeordnet/ausgebildet sind. Der Abstand dieser Kanalwände vergrößert sich in diesem divergierenden Abschnitt in Richtung zur Ablegeeinrichtung hin. Länge des Verstreckkanals bezieht sich im Übrigen auf die Erstreckung des Verstreckkanals zwischen Kühlkammer und Ablegeeinrichtung. Der divergierende Teil des Verstreckkanals wird nachfolgend auch als divergierender Verstreckkanalabschnitt oder kurz als divergierender Abschnitt bezeichnet.The fact that the channel walls of the drawing channel are designed to be divergent means, within the scope of the invention, in particular that the channel walls arranged transversely to the machine direction or transversely to the conveying direction of the spunbonded web are arranged / formed divergently. The distance between these channel walls increases in this diverging section in the direction of the depositing device out. Incidentally, the length of the drawing channel also refers to the extension of the drawing channel between the cooling chamber and the laying device. The diverging part of the stretching channel will also be referred to below as a diverging Verstreckkanalabschnitt or short as a diverging section.

Eine sehr bevorzugte Ausführungsform der Erfindung ist dadurch gekennzeichnet, dass die Kühlkammer in zumindest zwei Kühlkammerabschnitte unterteilt ist, in denen die Filamente jeweils mit Prozessluft unterschiedlicher Temperatur kühlbar sind. Diese besondere Ausführungsform hat sich im Rahmen der Erfindung besonders bewährt. Gemäß einer Ausführungsvariante ist die Temperatur der zugeführten Prozessluft in dem ersten oberen Kühlkammerabschnitt höher als die Temperatur der zugeführten Prozessluft in dem unteren zweiten Kühlkammerabschnitt. Erster oberer Kühlkammerabschnitt bezieht sich dabei auf den Kühlkammerabschnitt, in den die Filamente als erstes eintreten.A very preferred embodiment of the invention is characterized in that the cooling chamber is subdivided into at least two cooling chamber sections, in which the filaments can each be cooled with process air of different temperature. This particular embodiment has proven particularly useful in the context of the invention. According to an embodiment variant, the temperature of the supplied process air in the first upper cooling chamber section is higher than the temperature of the supplied process air in the lower second cooling chamber section. First upper cooling chamber section refers to the cooling chamber section into which the filaments enter first.

Erfindungsgemäß ist der Anschlussbereich zwischen Kühlkammer und Verstreckeinheit geschlossen ausgebildet. Die Verstreckeinheit ist also mit der Maßgabe an die Kühlkammer angeschlossen, dass im Anschlussbereich zwischen Kühlkammer und Verstreckeinheit kein Lufteintritt bzw. im Wesentlichen kein Lufteintritt stattfindet. Die Verstreckeinheit kann dabei unmittelbar und luftzuführungsspaltfrei an die Kühlkammer angeschlossen sein. Nach einer bevorzugten Ausführungsform der Erfindung ist zwischen der Kühlkammer und der Verstreckeinheit ein Zwischenkanal angeordnet. Es liegt dabei im Rahmen der Erfindung, dass in diesen Zwischenkanal keine Luft von außen bzw. im Wesentlichen keine Luft von außen eingeführt wird. Das bedeutet, dass in den Zwischenkanal lediglich die Prozessluft aus der Kühlkammer eingeführt wird und ansonsten keine Luftzufuhr oder im Wesentlichen keine Luftzufuhr von außen erfolgt. Vorzugsweise verläuft der Zwischenkanal von der Kühlkammer zur Verstreckeinheit hin konvergierend.According to the invention, the connection region between the cooling chamber and the stretching unit is designed to be closed. The drafting unit is thus connected to the cooling chamber with the proviso that no air inlet or substantially no air inlet takes place in the connection area between the cooling chamber and the drafting unit. The stretching unit can be connected directly to the cooling chamber and free of air supply gaps. According to a preferred embodiment of the invention, an intermediate channel is arranged between the cooling chamber and the drawing unit. It is within the scope of the invention that in this intermediate channel no air from the outside or substantially no air is introduced from the outside. This means that in the intermediate channel only the process air is introduced from the cooling chamber and otherwise no air supply or substantially no air supply from the outside. Preferably, the intermediate channel extends converging from the cooling chamber to the drawing unit.

Dabei sind die quer zur Maschinenrichtung bzw. quer zur Förderrichtung der Spinnvliesbahn angeordneten Zwischenkanalwände konvergierend angeordnet. Der Zwischenkanal verjüngt sich somit von der Kühlkammer zur Verstreckeinheit hin. Nach einer Ausführungsvariante der .Erfindung sind unterschiedliche Konvergenzwinkel des Zwischenkanals einstellbar. Es liegt im Rahmen der Erfindung, dass das untere Ende des Zwischenkanals luftzuführungsspaltfrei bzw. im Wesentlichen luftzuführungsspaltfrei an den Verstreckkanal der Verstreckeinheit angeschlossen ist. Dann gelangt also nur die Prozessluft (mit den Filamenten) und sonst keine zusätzliche Luft oder im Wesentlichen keine zusätzliche Luft aus dem Zwischenkanal in den Verstreckkanal.In this case, the transversely to the machine direction or transversely to the conveying direction of the spunbonded web arranged intermediate channel walls are arranged converging. The intermediate channel thus tapers from the cooling chamber to the drawing unit. According to an embodiment variant of the invention, different convergence angles of the intermediate channel can be set. It is within the scope of the invention that the lower end of the intermediate channel is connected to the drawing channel of the drawing unit in an air-feed gap-free manner or substantially free of air feed gap. Then only the process air (with the filaments) and otherwise no additional air or substantially no additional air from the intermediate channel into the Verstreckkanal.

Es empfiehlt sich aber, dass in der Verstreckeinheit am Anfang des divergierenden Verstreckkanalabschnitts oder kurz vor dem divergierenden Verstreckkanalabschnitt zusätzliche Luft in den Verstreckkanal eingeführt bzw. eingeblasen wird. Dabei wird die Luft zweckmäßigerweise in Bewegungsrichtung der Filamente bzw. des Filamentbündels und vorzugsweise tangential zum Filamentbündel eingeblasen. Die Luft wird bevorzugt gleichsam als Grenzschichtausblasung tangential eingespeist. Empfohlenermaßen erfolgt die Lufteinblasung an beiden gegenüberliegenden Kanalwänden bzw. gegenüberliegenden divergierenden Kanalwänden des Verstreckkanals und dabei vorzugsweise auf gleicher Höhe in Bezug auf die Länge des Verstreckkanals. Eine derartige zweiseitige Lufteinspeisung kann auch zweifach oder mehrfach auf unterschiedlichen Höhenniveaus des Verstreckkanals erfolgen. Die Lufteinblasung erfolgt zweckmäßigerweise mit der Maßgabe, dass das Filamentbündel in Maschinenrichtung bzw. in Förderrichtung der Spinnvliesbahn aufgeweitet wird. Dabei wird vorzugsweise so verfahren, dass Öffnungswinkel des Filamentbündels von 0,1 bis 10°, bevorzugt von 0,1 bis 1° erzielt werden. - Die Angabe "am Anfang des divergierenden Verstreckkanalabschnitts" meint insbesondere das in Bezug auf die Länge des divergierenden Verstreckkanalabschnitts erste Drittel, bevorzugt das erste Viertel und besonders bevorzugt das erste Fünftel des divergierenden Verstreckkanalabschnitts. - Der Abstand der Kanalwände des Verstreckkanals beträgt zweckmäßigerweise 5 bis 30 mm, vorzugsweise 8 bis 25 mm und bevorzugt 10 bis 20 mm.However, it is recommended that additional air be introduced or blown into the drafting channel at the beginning of the diverging Verstreckkanalabschnitts or shortly before the diverging Verstreckkanalabschnitt. The air is expediently blown in the direction of movement of the filaments or of the filament bundle and preferably tangentially to the filament bundle. The air is preferably fed tangentially as a boundary layer blower. Empfohlenermaßen the air injection takes place at both opposite channel walls or opposite diverging channel walls of Verstreckkanals and preferably at the same height with respect to the length of the Verstreckkanals. Such a two-sided air feed can also be done twice or more at different height levels of the Verstreckkanals. The air injection is expediently with the proviso that the filament bundle is widened in the machine direction or in the conveying direction of the spunbonded web. In this case, the procedure is preferably such that the opening angle of the filament bundle of 0.1 to 10 °, preferably from 0.1 to 1 ° can be achieved. The statement "at the beginning of the diverging Verstreckkanalabschnitts" means in particular that with respect to the length of divergent Verstreckkanalabschnitts first third, preferably the first quarter and more preferably the first fifth of the diverging Verstreckkanalabschnitts. - The distance of the channel walls of the drawing channel is suitably 5 to 30 mm, preferably 8 to 25 mm and preferably 10 to 20 mm.

Es liegt im Rahmen der Erfindung, dass zumindest ein Viertel, bevorzugt zumindest ein Drittel der Länge des Verstreckkanals divergierend bzw. als divergierender Abschnitt ausgebildet ist. Vorzugsweise sind zumindest 40 % der Länge des Verstreckkanals divergierend bzw. als divergierender Abschnitt ausgeführt. Nach einer ersten bevorzugten Ausführungsvariante der Erfindung weist der Verstreckkanal über seine gesamte Länge bzw. im Wesentlichen über seine gesamte Länge divergierende Kanalwände auf. Gemäß dieser Ausführungsform ist also der gesamte Verstreckkanal bzw. im Wesentlichen der gesamte Verstreckkanal divergierend ausgebildet. Es liegt im Rahmen der Erfindung, dass der Verstreckkanal über zumindest 90 %, bevorzugt über zumindest 95 % seiner Länge als divergierender Kanal ausgebildet ist.It is within the scope of the invention that at least a quarter, preferably at least one third, of the length of the drawing channel is divergent or designed as a diverging section. Preferably, at least 40% of the length of the drawing channel is divergent or designed as a diverging section. According to a first preferred embodiment of the invention, the Verstreckkanal on its entire length or substantially over its entire length diverging channel walls. According to this embodiment, therefore, the entire Verstreckkanal or substantially the entire Verstreckkanal is formed diverging. It is within the scope of the invention that the Verstreckkanal is formed over at least 90%, preferably over at least 95% of its length as a diverging channel.

Nach einer weiteren bevorzugten Ausführungsform der Erfindung weist der Verstreckkanal über einen Teil seiner Länge parallele Kanalwände auf (paralleler Abschnitt) und an diesen parallelen Abschnitt schließen dann divergierende Kanalwände an (divergierender Abschnitt). Es liegt dabei im Rahmen der Erfindung, dass der Verstreckkanal bei dieser Ausführungsform ausschließlich aus dem genannten parallelen Abschnitt und dem daran anschließenden divergierenden Abschnitt besteht. Die zusätzliche Luftzufuhr erfolgt bei dieser Ausführungsform entweder am Ende des parallelen Abschnitts oder am Anfang des divergierenden Abschnitts des Verstreckkanals. Ende des parallelen Abschnitts meint dabei insbesondere das in Bezug auf die Länge des parallelen Abschnitts letzte Drittel, bevorzugt letzte Viertel und sehr bevorzugt letzte Fünftel des parallelen Abschnitts. Anfang des divergierenden Abschnitts meint hier und nachfolgend insbesondere das in Bezug auf die Länge des divergierenden Abschnitts erste Drittel, bevorzugt das erste Viertel und sehr bevorzugt das erste Fünftel des divergierenden Abschnitts. Vorzugsweise ist der divergierende Abschnitt dieser Ausführungsform länger als der parallele Abschnitt, wobei der divergierende Abschnitt zweckmäßigerweise zumindest 1,5 mal so lang ist wie der parallele Abschnitt.According to a further preferred embodiment of the invention, the Verstreckkanal over a portion of its length parallel channel walls (parallel section) and at this parallel section then connect diverging channel walls (divergent section). It is within the scope of the invention that the Verstreckkanal consists in this embodiment exclusively of said parallel section and the adjoining diverging section. The additional air supply takes place in this embodiment either at the end of the parallel section or at the beginning of the diverging section of the Verstreckkanals. In this case, the end of the parallel section means, in particular, the last third, preferably the last quarter, and very preferably the last fifth, of the parallel section, with respect to the length of the parallel section. Beginning of the divergent section means here and below in particular the first third with respect to the length of the diverging section, preferably the first quarter, and very preferably the first fifth of the diverging section. Preferably, the diverging portion of this embodiment is longer than the parallel portion, and the diverging portion is desirably at least 1.5 times as long as the parallel portion.

Nach einer weiteren bevorzugten Ausführungsform der Erfindung weist der Verstreckkanal über einen Teil seiner Länge konvergierende Kanalwände auf (konvergierender Abschnitt) und daran schließen die divergierenden Kanalwände an (divergierender Abschnitt). Es liegt dabei im Rahmen der Erfindung, dass der Verstreckkanal bei dieser Ausführungsform ausschließlich aus dem konvergierenden und dem divergierenden Abschnitt besteht. Der divergierende Abschnitt schließt also unmittelbar an den konvergierenden Abschnitt an. Die zusätzliche Luftzufuhr erfolgt bei dieser Ausführungsform zweckmäßigerweise im Übergangsbereich zwischen konvergierendem Abschnitt und divergierendem Abschnitt oder am Anfang des divergierenden Abschnitts. Vorzugsweise ist bei dieser Ausführungsform der divergierende Abschnitt länger als der konvergierende Abschnitt und bevorzugt ist der divergierende Abschnitt mindestens 1,5 mal so lang wie der konvergierende Abschnitt.According to another preferred embodiment of the invention, the drafting channel has converging channel walls over a part of its length (converging section) and adjoining the diverging channel walls (divergent section). It is within the scope of the invention that the Verstreckkanal in this embodiment consists solely of the convergent and the diverging section. The diverging section thus directly adjoins the convergent section. The additional air supply in this embodiment is expediently carried out in the transition region between the convergent section and diverging section or at the beginning of the diverging section. Preferably, in this embodiment, the diverging portion is longer than the converging portion, and preferably, the diverging portion is at least 1.5 times as long as the converging portion.

Gemäß einer weiteren Ausführungsform der Erfindung weist der Verstreckkanal über einen Teil seiner Länge konvergierende Kanalwände auf (konvergierender Abschnitt), wobei daran parallele Kanalwände anschließen (paralleler Abschnitt) und wobei daran wiederum divergierende Kanalwände anschließen (divergierender Abschnitt). Nach einer Ausführungsvariante besteht der Verstreckkanal hier ausschließlich aus dem konvergierenden Abschnitt, dem daran anschließenden parallelen Abschnitt und dem daran wiederum anschließenden divergierenden Abschnitt. Grundsätzlich kann an den letztgenannten divergierenden Abschnitt aber auch ein zweiter paralleler Abschnitt anschließen. Die zusätzliche Luftzufuhr erfolgt bei dieser Ausführungsform zweckmäßigerweise am Ende des (ersten) parallelen Abschnitts oder am Anfang des divergierenden Abschnitts. Ende des parallelen Abschnitts meint in Bezug auf die Länge des parallelen Abschnitts insbesondere das letzte Drittel, bevorzugt das letzte Viertel und sehr bevorzugt das letzte Fünftel des parallelen Abschnitts. Bei dieser Ausführungsform (konvergierend-parallel-divergierend) ist empfohlenermaßen der divergierende Abschnitt der längste Kanalabschnitt. Das bedeutet, dass der divergierende Abschnitt jeweils länger als der parallele Abschnitt und länger als der konvergierende Abschnitt ist. Gemäß besonders empfohlener Ausführungsvariante ist der divergierende Abschnitt länger als der gesamte Kanalabschnitt aus konvergierendem und parallelem Abschnitt.According to a further embodiment of the invention, the drafting channel has converging channel walls over a part of its length (converging section), connecting thereto parallel channel walls (parallel section) and, in turn, connecting divergent channel walls (diverging section). According to one embodiment variant, the drafting channel here consists exclusively of the convergent section, the adjoining parallel section and the subsequent diverging section. Basically, to the the last mentioned diverging section but also a second parallel section. The additional air supply in this embodiment is expediently carried out at the end of the (first) parallel section or at the beginning of the divergent section. End of the parallel section means with respect to the length of the parallel section in particular the last third, preferably the last quarter and very preferably the last fifth of the parallel section. In this embodiment (converging-parallel-diverging), it is recommended that the divergent section be the longest channel section. This means that the divergent section is longer than the parallel section and longer than the convergent section. According to a particularly recommended embodiment variant, the divergent section is longer than the entire channel section of converging and parallel section.

Nach bevorzugter Ausführungsform der Erfindung sind die divergierenden Kanalwände des divergierenden Abschnitts symmetrisch in Bezug auf eine vertikal durch den Verstreckkanal verlaufende Mittelebene angeordnet. Grundsätzlich liegt es aber auch im Rahmen der Erfindung, dass die divergierenden Kanalwände asymmetrisch bezüglich dieser Mittelebene angeordnet sein können. Dann würde also eine der beiden divergierenden Kanalwände eine stärkere Neigung bzw. Schrägstellung aufweisen als die andere gegenüberliegende Kanalwand. Nach bevorzugter Ausführungsform der Erfindung bleibt der Divergenzwinkel des divergierenden Abschnittes über die Länge des divergierenden Abschnittes konstant. Grundsätzlich ist es aber auch möglich, dass sich der Divergenzwinkel über die Länge des divergierenden Abschnitts ändert.According to a preferred embodiment of the invention, the diverging channel walls of the diverging portion are arranged symmetrically with respect to a vertically extending through the Verstreckkanal center plane. In principle, however, it is also within the scope of the invention that the diverging channel walls can be arranged asymmetrically with respect to this center plane. Then one of the two diverging channel walls would then have a greater inclination or inclination than the other opposing channel wall. According to a preferred embodiment of the invention, the divergence angle of the diverging section remains constant over the length of the diverging section. In principle, however, it is also possible for the divergence angle to change over the length of the divergent section.

Es liegt im Rahmen der Erfindung, dass Kühlkammer und Verstreckeinheit der erfindungsgemäßen Vorrichtung eine geschlossene Einheit ausbilden. Dabei beschränkt sich die Luftzufuhr in das Aggregat aus Kühlkammer und Verstreckeinheit zumindest im Wesentlichen auf die Einführung der Prozessluft in die Kühlkammer einerseits und auf die zusätzliche Luftzufuhr vor dem divergierenden Abschnitt bzw. zu Anfang des divergierenden Abschnittes in den Verstreckkanal andererseits. Natürlich kann auch Luft mit der Filamentschar von oben in die Kühlkammer gelangen.It is within the scope of the invention that the cooling chamber and drawing unit of the device according to the invention form a closed unit. The air supply is limited in the aggregate of cooling chamber and Stretching at least substantially on the introduction of the process air in the cooling chamber on the one hand and on the additional air supply before the diverging section or at the beginning of the diverging section in the Verstreckkanal other hand. Of course, air with the filament bundle can reach the cooling chamber from above.

Eine besondere Ausführungsform der im Rahmen der Erfindung ganz besondere Bedeutung zukommt ist dadurch gekennzeichnet, dass an die Verstreckeinheit eine Verlegeeinheit mit zumindest einem Diffusor anschließt. Die Filamente bzw. das Filamentbündel werden also nach der Verstreckeinheit durch zumindest einen Diffusor geführt. Ein Diffusor weist zumindest bereichsweise divergierende Diffusorwände auf. Die Diffusorwände sind dabei quer zur Maschinenrichtung bzw. quer zur Förderrichtung der Spinnvliesbahn angeordnet. Nach einer empfohlenen Ausführungsvariante besteht die Verlegeeinheit aus einem ersten Diffusor und einem daran anschließenden zweiten Diffusor. Zweckmäßigerweise ist zwischen dem ersten Diffusor und dem zweiten Diffusor ein Umgebungslufteintrittsspalt vorgesehen. Aufgrund des Austrittsimpulses aus dem ersten Diffusor kommt es zu einem Ansaugen von Luft aus der Umgebung durch diesen Umgebungslufteintrittsspalt. Zweckmäßigerweise ist die Weite des Umgebungslufteintrittsspaltes einstellbar.A particular embodiment of the invention has special significance in the context of the invention is characterized in that the extension unit is followed by a laying unit with at least one diffuser. The filaments or the filament bundle are thus guided after the drawing unit through at least one diffuser. A diffuser has at least partially diverging diffuser walls. The diffuser walls are arranged transversely to the machine direction or transversely to the conveying direction of the spunbonded web. According to a recommended embodiment, the laying unit consists of a first diffuser and an adjoining second diffuser. Conveniently, an ambient air inlet gap is provided between the first diffuser and the second diffuser. Due to the exit pulse from the first diffuser, air is drawn in from the environment through this ambient air inlet gap. Conveniently, the width of the ambient air inlet gap is adjustable.

Es liegt im Rahmen der Erfindung, dass die Ablegeeinrichtung der erfindungsgemäßen Vorrichtung ein kontinuierlich bewegtes Ablegesiebband für die Spinnvliesbahn ist. Zweckmäßigerweise ist unter dem Ablegesiebband zumindest eine Saugeinrichtung vorgesehen, mit der Luft durch das Ablegesiebband saugbar ist.It is within the scope of the invention that the depositing device of the device according to the invention is a continuously moving Ablegesiebband for the spunbonded web. Conveniently, at least one suction device is provided under the Ablegesiebband, with the air through the Ablegesiebband is sucked.

Der Erfindung liegt die Erkenntnis zugrunde, dass mit der erfindungsgemäßen Vorrichtung qualitativ sehr hochwertige Spinnvliese herstellbar sind, die sich insbesondere durch eine homogene Struktur und homogene Eigenschaften auszeichnen. Der Erfindung liegt insbesondere die Erkenntnis zugrunde, dass durch die erfindungsgemäße Ausgestaltung der Verstreckeinheit eine unerwünschte Kompaktierung des Filamentbündels vermieden werden kann bzw. eine bereits erfolgte Kompaktierung weitgehend rückgängig gemacht werden kann. Durch die erfindungsgemäße Behandlung des Filamentbündels kann eine effektive Separierung in Einzelfilamente erfolgen. Mit der erfindungsgemäßen Ausgestaltung wird somit erreicht, dass eine hohe Anzahl der Filamente in Form von Einzelfilamenten abgelegt werden kann. Dadurch kann die Qualität der erfindungsgemäß erzeugten Spinnvliese im Vergleich zu mit bekannten Vorrichtungen hergestellten Spinnvliesen beachtlich gesteigert werden. Hervorzuheben ist weiterhin, dass der erfindungsgemäße Erfolg durch verhältnismäßig einfache und kostengünstige Maßnahmen realisierbar ist. Im Ergebnis können hochwertige Spinnvliese mit gleichmäßigen bzw. homogenen Struktureigenschaften erhalten werden.The invention is based on the finding that with the device according to the invention, very high quality spunbonded nonwovens can be produced, which are characterized in particular by a homogeneous structure and homogeneous properties distinguished. The invention is based in particular on the finding that undesirable compaction of the filament bundle can be avoided by the inventive design of the stretching unit, or that compacting already carried out can be largely reversed. By treating the filament bundle according to the invention, an effective separation into individual filaments can take place. With the embodiment according to the invention is thus achieved that a high number of filaments in the form of individual filaments can be stored. As a result, the quality of the spunbonded nonwoven produced according to the invention can be considerably increased in comparison to spunbonded nonwovens produced with known devices. It should also be emphasized that the success of the invention can be realized by relatively simple and cost-effective measures. As a result, high-quality spun-bonded nonwovens having uniform or homogeneous structural properties can be obtained.

Nachfolgend wird die Erfindung anhand einer lediglich ein Ausführungsbeispiel darstellenden Zeichnung näher erläutert. Es zeigen in schematischer Darstellung:

Fig. 1
einen Vertikalschnitt durch eine erfindungsgemäße Vorrichtung,
Fig. 2
den vergrößerten Ausschnitt A aus Fig. 1,
Fig. 3
den Gegenstand nach Fig. 2 in einer zweiten Ausführungsform,
Fig. 4
den Gegenstand gemäß Fig. 2 in einer dritten Ausführungsform und
Fig. 5
den Gegenstand nach Fig. 2 in einer vierten Ausführungsform.
The invention will be explained in more detail with reference to a drawing showing only one exemplary embodiment. In a schematic representation:
Fig. 1
a vertical section through a device according to the invention,
Fig. 2
the enlarged section A from Fig. 1 .
Fig. 3
the object after Fig. 2 in a second embodiment,
Fig. 4
the object according to Fig. 2 in a third embodiment and
Fig. 5
the object after Fig. 2 in a fourth embodiment.

Die Figuren zeigen eine Vorrichtung zur kontinuierlichen Herstellung von Spinnvliesen aus aerodynamisch verstreckten Filamenten aus thermoplastischem Kunststoff. Die Vorrichtung weist eine Spinnerette 1 zur Erzeugung der Filamente auf. Der Spinnerette 1 ist eine Kühlkammer 2 nachgeschaltet, in der Prozessluft zur Kühlung der Filamente zugeführt wird. Die Kühlkammer 2 ist vorzugsweise und im Ausführungsbeispiel in zwei Kühlkammerabschnitte 3, 4 unterteilt, in denen die Filamente jeweils mit Prozessluft unterschiedlicher Temperatur gekühlt werden. Gemäß einer bevorzugten Ausführungsform der Erfindung ist die Temperatur der Prozessluft mit der die Filamente in dem ersten oberen Kühlkammerabschnitt 3 beaufschlagt werden, höher als die Temperatur der Prozessluft mit dem die Filamente in dem zweiten unteren Kühlkammerabschnitt 4 beaufschlagt werden.The figures show an apparatus for the continuous production of spunbonded nonwovens from aerodynamically stretched filaments of thermoplastic material. The device has a spinnerette 1 for producing the filaments. The spinnerette 1 is connected downstream of a cooling chamber 2, is supplied in the process air for cooling the filaments. The cooling chamber 2 is preferably and in the exemplary embodiment divided into two cooling chamber sections 3, 4, in which the filaments are each cooled with process air of different temperature. According to a preferred embodiment of the invention, the temperature of the process air with which the filaments in the first upper cooling chamber section 3 are applied is higher than the temperature of the process air with which the filaments in the second lower cooling chamber section 4 are acted upon.

An die Kühlkammer 2 ist eine Verstreckeinheit 5 für die aerodynamische Verstreckung der Filamente angeschlossen. Vorzugsweise und im Ausführungsbeispiel ist dabei die Kühlkammer 2 über einen Zwischenkanal 6 mit der Verstreckeinheit 5 verbunden. Der Anschlussbereich zwischen Kühlkammer 2 und Verstreckeinheit 5 ist erfindungsgemäß geschlossen ausgebildet. Das bedeutet, dass in diesem Übergangsbereich und insbesondere im Bereich des Zwischenkanals 6 keine Luft bzw. im Wesentlichen keine Luft von außen in den Strömungsweg der Filamente eingeführt wird. Zweckmäßigerweise und im Ausführungsbeispiel verläuft der Zwischenkanal 6 von der Kühlkammer 2 zur Verstreckeinheit 5 hin konvergierend. Mit anderen Worten verjüngt sich der Zwischenkanal 6 von der Kühlkammer 2 zur Verstreckeinheit 5.To the cooling chamber 2, a stretching unit 5 is connected for the aerodynamic stretching of the filaments. Preferably, and in the embodiment, the cooling chamber 2 is connected via an intermediate channel 6 with the drawing unit 5. The connection region between the cooling chamber 2 and the stretching unit 5 is formed closed according to the invention. This means that in this transition region and in particular in the region of the intermediate channel 6 no air or substantially no air is introduced from the outside into the flow path of the filaments. Conveniently, and in the exemplary embodiment, the intermediate channel 6 extends from the cooling chamber 2 to the stretching unit 5 converging. In other words, the intermediate channel 6 tapers from the cooling chamber 2 to the stretching unit 5.

Erfindungsgemäß weist die Verstreckeinheit 5 einen Verstreckkanal 7 auf, dessen Kanalwände 8, 9 zumindest über einen Teil der Länge des Verstreckkanals 7 divergierend angeordnet sind. Die Kanalwände 8, 9 bilden also zumindest einen divergierenden Abschnitt 10, in dem sich der Abstand der Kanalwände 8, 9 nach unten hin vergrößert. Bei diesen Kanalwänden 8, 9 handelt es sich um die quer zur Maschinenrichtung bzw. quer zur Förderrichtung des Spinnvlieses angeordneten Kanalwände 8, 9 des Verstreckkanals 7. Die Förderrichtung des Spinnvlieses wird in Fig. 1 durch einen Doppelpfeil angedeutet.According to the invention, the drawing unit 5 has a drawing channel 7, the channel walls 8, 9 of which are arranged divergently over at least part of the length of the drawing channel 7. The channel walls 8, 9 thus form at least one diverging section 10, in which the distance of the Canal walls 8, 9 enlarged towards the bottom. These channel walls 8, 9 are the channel walls 8, 9 of the stretching channel 7 which are arranged transversely to the machine direction or transversely to the conveying direction of the spunbonded nonwoven fabric. The conveying direction of the spunbonded nonwoven fabric is in Fig. 1 indicated by a double arrow.

In Fig. 1 ist erkennbar, dass sich an die Verstreckeinheit 5 eine Verlegeeinheit 11 anschließt, die vorzugsweise und im Ausführungsbeispiel aus einem ersten Diffusor 12 und einem zweiten Diffusor 13 besteht. In der Fig. 1 ist weiterhin erkennbar, dass zwischen dem ersten Diffusor 12 und dem zweiten Diffusor 13 ein Umgebungslufteintrittsspalt 14 vorgesehen ist. Jeder Diffusor 12, 13 weist ein oberes konvergierendes Teil sowie ein unteres divergierendes Teil auf. Dementsprechend hat jeder Diffusor 12, 13 eine engste Stelle zwischen dem oberen konvergierenden Teil und dem unteren divergierenden Teil. Zweckmäßigerweise sind die Diffusorwände im divergierenden Teil des ersten Diffusors 12 und/oder des zweiten Diffusors 13 verstellbar, so dass der Öffnungswinkel des jeweiligen divergierenden Teils einstellbar ist.In Fig. 1 It can be seen that the stretching unit 5 is followed by a laying unit 11, which preferably and in the exemplary embodiment consists of a first diffuser 12 and a second diffuser 13. In the Fig. 1 Furthermore, it can be seen that an ambient air inlet gap 14 is provided between the first diffuser 12 and the second diffuser 13. Each diffuser 12, 13 has an upper converging part and a lower diverging part. Accordingly, each diffuser 12, 13 has a narrowest point between the upper converging part and the lower diverging part. Conveniently, the diffuser walls in the diverging part of the first diffuser 12 and / or the second diffuser 13 are adjustable, so that the opening angle of the respective diverging part is adjustable.

Unterhalb der Verlegeeinheit 11 ist ein kontinuierlich bewegtes Ablegesiebband 15 als Ablegeeinrichtung für die Spinnvliesbahn vorgesehen. Unter diesem Ablegesiebband 15 ist zweckmäßigerweise zumindest eine nicht in den Figuren dargestellte Saugeinrichtung vorgesehen, mit der in an sich üblicher Weise Luft durch das Ablegesiebband 15 angesaugt werden kann.Below the laying unit 11 is a continuously moving Ablegesiebband 15 is provided as a depositing device for the spunbonded web. Under this Ablegesiebband 15 suitably at least one suction device not shown in the figures is provided with the air in a conventional manner by the Ablegesiebband 15 can be sucked.

In den Figuren 2 bis 5 sind bevorzugte Ausführungsformen für die Ausgestaltung des Verstreckkanals 7 der Verstreckeinheit 5 dargestellt. In allen diesen Ausführungsbeispielen wird am Anfang des divergierenden Verstreckkanalabschnitts bzw. am Anfang des divergierenden Abschnitts 10 oder kurz vor dem divergierenden Abschnitt 10 zusätzliche Luft in den Verstreckkanal 7 eingeblasen. Die Einführung der Luft erfolgt dabei zweckmäßigerweise in Bewegungsrichtung der Filamente bzw. des Filamentbündels und vorzugsweise tangential zu den Filamenten bzw. zum Filamentbündel. Wie in den Figuren 2 bis 5 erkennbar ist, erfolgt die Lufteinblasung bevorzugt von beiden gegenüberliegenden Kanalwänden 8, 9 aus und dabei auf gleicher Höhe der Verstreckeinheit 5. Es liegt dabei im Rahmen der Erfindung, dass die Luft mit der Maßgabe eingeblasen wird, dass das Filamentbündel aufgeweitet wird,
wobei der Öffnungswinkel des Filamentbündels vorzugsweise 0,1 bis 1° beträgt. Diese Aufweitung des Filamentbündels ist in den Figuren 2 bis 5 angedeutet worden. - Soweit hier und nachfolgend von dem Anfang des divergierenden Abschnitts 10 die Rede ist, meint das in Bezug auf die Länge des divergierenden Abschnitts 10 insbesondere das erste Drittel, bevorzugt das erste Viertel und sehr bevorzugt das erste Fünftel des divergierenden Abschnitts 10.In the FIGS. 2 to 5 preferred embodiments for the embodiment of the drawing channel 7 of the drawing unit 5 are shown. In all these embodiments, additional air is blown into the drafting channel 7 at the beginning of the diverging Verstreckkanalabschnitts or at the beginning of the diverging section 10 or just before the diverging section. The introduction of the air takes place expediently in Direction of movement of the filaments or of the filament bundle and preferably tangentially to the filaments or to the filament bundle. As in the FIGS. 2 to 5 can be seen, the air injection preferably takes place from both opposite channel walls 8, 9 and at the same height of the drawing unit 5. It is within the scope of the invention that the air is blown in with the proviso that the filament bundle is widened,
wherein the opening angle of the filament bundle is preferably 0.1 to 1 °. This expansion of the filament bundle is in the FIGS. 2 to 5 been hinted at. - As far as here and below the beginning of the diverging section 10 is mentioned, this means in relation to the length of the diverging section 10 in particular the first third, preferably the first quarter and very preferably the first fifth of the diverging section 10th

Fig. 2 zeigt eine erste Ausführungsform der erfindungsgemäßen Verstreckeinheit 5, bei der der Verstreckkanal 7 über seine gesamte Länge divergierende Kanalwände 8, 9 aufweist. Mit anderen Worten ist der gesamte Verstreckkanal 7 divergierend ausgebildet. Die Luftzufuhr erfolgt hier am Anfang des divergierenden Verstreckkanals 7. Die Kanalwände 8, 9 sind bezüglich der Mittelebene M symmetrisch angeordnet. Außerdem bleibt der Divergenzwinkel zwischen den Kanalwänden 8, 9 über die Länge des Verstreckkanals 7 konstant. Fig. 2 shows a first embodiment of the drawing unit 5 according to the invention, in which the Verstreckkanal 7 over its entire length diverging channel walls 8, 9 has. In other words, the entire Verstreckkanal 7 is formed diverging. The air supply takes place here at the beginning of the diverging Verstreckkanals 7. The channel walls 8, 9 are arranged symmetrically with respect to the center plane M. In addition, the divergence angle between the channel walls 8, 9 remains constant over the length of the Verstreckkanals 7.

Im Ausführungsbeispiel nach Fig. 3 weist der Verstreckkanal 7 zunächst einen parallelen Abschnitt 16 mit parallelen Kanalwänden 8, 9 auf, an den sich dann der divergierende Abschnitt 10 anschließt. Die Luftzufuhr erfolgt hier am Anfang dieses divergierenden Abschnitts 10. In Fig. 3 ist erkennbar, dass der divergierende Abschnitt 10 länger ausgebildet ist als der parallele Abschnitt 16 und zwar in etwa doppelt so lang. Auch im Ausführungsbeispiel nach Fig. 3 sind die Kanalwände 8, 9 im divergierenden Abschnitt 10 symmetrisch bezüglich der Mittelebene M angeordnet und der Divergenzwinkel bleibt über die Länge des divergierenden Abschnitts 10 konstant.In the embodiment according to Fig. 3 the Verstreckkanal 7 initially has a parallel section 16 with parallel channel walls 8, 9, to which then the diverging section 10 connects. The air supply takes place here at the beginning of this diverging section 10. In Fig. 3 It can be seen that the diverging portion 10 is formed longer than the parallel portion 16 and in about twice as long. Also in the exemplary embodiment Fig. 3 are the channel walls 8, 9 in the diverging section 10 symmetrical with respect to Middle plane M arranged and the Divergenzwinkel remains constant over the length of the diverging portion 10.

Fig. 4 zeigt eine Ausführungsform, bei der der Verstreckkanal 7 zunächst einen konvergierenden Abschnitt 17 mit konvergierenden Kanalwänden 8, 9 aufweist, an den dann unmittelbar der divergierende Abschnitt 10 anschließt. Die Luftzufuhr erfolgt auch hier am Anfang des divergierenden Abschnitts 10. Der divergierende Abschnitt 10 ist im Ausführungsbeispiel nach Fig. 4 länger als der konvergierende Abschnitt 17 und zwar in etwa doppelt so lang. Fig. 4 shows an embodiment in which the Verstreckkanal 7 first has a converging portion 17 with converging channel walls 8, 9, then immediately followed by the diverging portion 10. The air supply is also here at the beginning of the diverging section 10. The diverging section 10 is in the embodiment according to Fig. 4 longer than the converging section 17, and about twice as long.

Fig. 5 zeigt eine Ausführungsform der Verstreckeinheit 5, bei der der Verstreckkanal 7 zunächst einen konvergierenden Abschnitt 17 mit konvergierenden Kanalwänden 8, 9 aufweist, an den sich ein paralleler Abschnitt 16 anschließt. An den parallelen Abschnitt 16 schließt dann unmittelbar der divergierende Abschnitt 10 an. Die Luftzufuhr erfolgt auch hier am Anfang des divergierenden Abschnitts 10. Die Länge des divergierenden Abschnitts 10 ist im Ausführungsbeispiel größer als die Länge des restlichen Verstreckkanals 7 aus konvergierendem Abschnitt 17 und parallelem Abschnitt 16. Im divergierenden Abschnitt 10 sind die Kanalwände 8, 9 symmetrisch bezüglich der Mittelebene M angeordnet. Der Divergenzwinkel bleibt über die Länge des divergierenden Abschnitts 10 konstant. Fig. 5 1 shows an embodiment of the drawing unit 5, in which the drawing channel 7 initially has a convergent section 17 with converging channel walls 8, 9, to which a parallel section 16 adjoins. The divergent section 10 then directly adjoins the parallel section 16. The air supply is also here at the beginning of the diverging section 10. The length of the diverging section 10 is greater than the length of the remaining Verstreckkanals 7 of converging section 17 and parallel section 16 in the embodiment. In the diverging section 10, the channel walls 8, 9 are symmetrical with respect the median plane M arranged. The divergence angle remains constant over the length of the diverging section 10.

Claims (11)

Vorrichtung zur Herstellung von Spinnvliesen aus Filamenten, wobei eine Spinneinrichtung zur Erzeugung der Filamente vorgesehen ist,
wobei der Spinneinrichtung eine Kühlkammer (2) nachgeschaltet ist, in der Prozessluft zur Kühlung der Filamente zugeführt wird,
wobei an die Kühlkammer (2) eine Verstreckeinheit (5) für die Verstreckung der Filamente angeschlossen ist und wobei der Anschlussbereich zwischen Kühlkammer (2) und Verstreckeinheit (5) geschlossen ausgebildet ist,
wobei die Verstreckeinheit (5) einen Verstreckkanal (7) aufweist, dessen Kanalwände (8, 9) zumindest über einen Teil der Länge des Verstreckkanals (7) divergierend angeordnet sind
und wobei eine Ablegeeinrichtung zur Ablage der Filamente zur Spinnvliesbahn vorgesehen ist.Apparatus for producing spunbonded filaments, wherein a spinning device is provided for producing the filaments,
wherein the spinning device is followed by a cooling chamber (2) in which process air is supplied for cooling the filaments,
wherein a stretching unit (5) for the drawing of the filaments is connected to the cooling chamber (2) and wherein the connection area between the cooling chamber (2) and drawing unit (5) is designed to be closed,
wherein the stretching unit (5) has a Verstreckkanal (7), the channel walls (8, 9) are arranged divergently at least over part of the length of the Verstreckkanals (7)
and wherein a depositing device is provided for depositing the filaments to the spunbonded nonwoven web. Vorrichtung nach Anspruch 1, wobei die Kühlkammer (2) in zumindest zwei Kühlkammerabschnitte (3, 4) unterteilt ist, in denen die Filamente jeweils mit Prozessluft unterschiedlicher Temperatur kühlbar sind.Apparatus according to claim 1, wherein the cooling chamber (2) is subdivided into at least two cooling chamber sections (3, 4) in which the filaments can each be cooled with process air of different temperature. Vorrichtung nach einem der Ansprüche 1 oder 2, wobei zwischen der Kühlkammer (2) und der Verstreckeinheit (5) ein Zwischenkanal (6) angeordnet ist, welcher Zwischenkanal (6) von der Kühlkammer (2) zur Verstreckeinheit (5) hin konvergierend verläuft.Device according to one of claims 1 or 2, wherein between the cooling chamber (2) and the drawing unit (5) an intermediate channel (6) is arranged, which intermediate channel (6) from the cooling chamber (2) to the drawing unit (5) converges towards. Vorrichtung nach einem der Ansprüche 1 bis 3, wobei in der Verstreckeinheit (5) am Anfang des divergierenden Verstreckkanalabschnitts (10) oder kurz vor dem divergierenden Verstreckkanalabschnitt (10) zusätzliche Luft in den Verstreckkanal (7) eingeführt wird.Device according to one of claims 1 to 3, wherein in the drawing unit (5) at the beginning of the diverging Verstreckkanalabschnitts (10) or shortly before the diverging Verstreckkanalabschnitt (10) additional air is introduced into the Verstreckkanal (7). Vorrichtung nach einem der Ansprüche 1 bis 4, wobei der Verstreckkanal (7) über seine gesamte Länge bzw. im Wesentlichen über seine gesamte Länge divergierende Kanalwände (8, 9) aufweist.Device according to one of claims 1 to 4, wherein the Verstreckkanal (7) over its entire length or substantially over its entire length diverging channel walls (8, 9). Vorrichtung nach einem der Ansprüche 1 bis 4, wobei der Verstreckkanal (7) über einen Teil seiner Länge parallele Kanalwände (8, 9) aufweist und wobei an diese parallelen Kanalwände (8, 9) divergierende Kanalwände (8, 9) anschließen.Device according to one of claims 1 to 4, wherein the Verstreckkanal (7) over a portion of its length parallel channel walls (8, 9) and wherein these parallel channel walls (8, 9) diverging channel walls (8, 9) connect. Vorrichtung nach einem der Ansprüche 1 bis 4, wobei der Verstreckkanal über einen Teil seiner Länge konvergierende Kanalwände (8, 9) aufweist und wobei an die konvergierenden Kanalwände (8, 9) divergierende Kanalwände (8, 9) anschließen.Device according to one of claims 1 to 4, wherein the Verstreckkanal over a portion of its length converging channel walls (8, 9) and wherein the converging channel walls (8, 9) diverging channel walls (8, 9) connect. Vorrichtung nach einem der Ansprüche 1 bis 4, wobei der Verstreckkanal (7) über einen Teil seiner Länge konvergierende Kanalwände (8, 9) aufweist, wobei daran parallele Kanalwände (8, 9) anschließen und wobei daran wiederum divergierende Kanalwände (8, 9) anschließen.Device according to one of claims 1 to 4, wherein the Verstreckkanal (7) over a portion of its length converging channel walls (8, 9), connect thereto parallel channel walls (8, 9) and in turn diverging channel walls (8, 9) connect. Vorrichtung nach einem der Ansprüche 1 bis 8, wobei an die Verstreckeinheit (5) eine Verlegeeinheit (11) mit zumindest einem Diffusor (12, 13) anschließt.Device according to one of claims 1 to 8, wherein the stretching unit (5) is followed by a laying unit (11) with at least one diffuser (12, 13). Vorrichtung nach Anspruch 9, wobei die Verlegeeinheit (11) aus einem ersten Diffusor (12) und einem daran anschließenden zweiten Diffusor (13) besteht und wobei zwischen dem ersten Diffusor (12) und dem zweiten Diffusor (13) ein Umgebungslufteintrittsspalt (14) vorgesehen ist.Apparatus according to claim 9, wherein the laying unit (11) consists of a first diffuser (12) and an adjoining second diffuser (13) and wherein an ambient air inlet gap (14) is provided between the first diffuser (12) and the second diffuser (13) is. Vorrichtung nach einem der Ansprüche 1 bis 10, wobei die Ablegeeinrichtung ein kontinuierlich bewegtes Ablegesiebband (15) für die Spinnvliesbahn ist.Apparatus according to any one of claims 1 to 10, wherein the depositing means is a continuously moving reject screen belt (15) for the spunbonded web.
EP07012793.1A 2007-06-29 2007-06-29 Method for manufacturing non woven material Active EP2009163B1 (en)

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DK07012793.1T DK2009163T3 (en) 2007-06-29 2007-06-29 Device for making filter cloth
ES07012793.1T ES2440244T3 (en) 2007-06-29 2007-06-29 Device for manufacturing nonwoven fabric
EP07012793.1A EP2009163B1 (en) 2007-06-29 2007-06-29 Method for manufacturing non woven material
PL07012793T PL2009163T3 (en) 2007-06-29 2007-06-29 Method for manufacturing non woven material
IL192000A IL192000A (en) 2007-06-29 2008-06-05 Apparatus for making a spunbond web
CA2635329A CA2635329C (en) 2007-06-29 2008-06-18 Apparatus for making a spunbond web
JP2008165256A JP5094588B2 (en) 2007-06-29 2008-06-25 Equipment for forming spunbond webs
US12/146,573 US7762800B2 (en) 2007-06-29 2008-06-26 Apparatus for making a spunbond web
CN2008101317808A CN101333730B (en) 2007-06-29 2008-06-27 Device for manufacturing spun-bonded fibre net
BRPI0803610-1A BRPI0803610B1 (en) 2007-06-29 2008-06-30 APPARATUS FOR MAKING AN UN-TENDED TISSUE

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IL192000A0 (en) 2009-02-11
IL192000A (en) 2012-02-29
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CA2635329C (en) 2012-08-07
ES2440244T3 (en) 2014-01-28
CN101333730B (en) 2010-11-10
CN101333730A (en) 2008-12-31
CA2635329A1 (en) 2008-12-29
PL2009163T3 (en) 2014-03-31
BRPI0803610A2 (en) 2009-05-05

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