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EP1178142B1 - Method and apparatus for making a spunbonded nonwoven - Google Patents

Method and apparatus for making a spunbonded nonwoven Download PDF

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Publication number
EP1178142B1
EP1178142B1 EP01113039A EP01113039A EP1178142B1 EP 1178142 B1 EP1178142 B1 EP 1178142B1 EP 01113039 A EP01113039 A EP 01113039A EP 01113039 A EP01113039 A EP 01113039A EP 1178142 B1 EP1178142 B1 EP 1178142B1
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EP
European Patent Office
Prior art keywords
air
nozzles
filaments
angle
airstream
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Expired - Lifetime
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EP01113039A
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German (de)
French (fr)
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EP1178142A1 (en
Inventor
Michael Hess
Engelbert Löcher
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Carl Freudenberg KG
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Carl Freudenberg KG
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    • 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)
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/681—Spun-bonded nonwoven fabric

Definitions

  • spunbonded nonwovens suitable devices
  • starting materials are thermoplastic polymers used that melted to fine Spun threads are spun.
  • the spun threads are mostly stretched aerodynamically and thereby obtain the desired strength.
  • the threads are deposited after the spinning process or under Interposition of coils on a storage belt on which they come to lie on top of each other and form the spunbond.
  • DE-AS 1 303 569 describes a process for producing nonwovens known in which the spun threads are guided through a channel be stretched aerodynamically there and then on one perforated, moving pad in fleece form.
  • a turbulence zone is provided below the air duct Cross-threading supported.
  • the result is a very irregular one Fleece image.
  • a high uniformity of the spunbond is achieved that several guide channels are provided in succession and the resulting channels protruding layers of thread in layers one above the other to form a fleece be filed.
  • the spinning beam together with the thread take-off device rotatable train should also eliminate the disadvantages that the So-called curtain procedures occur and in certain areas can lead to overlays of individual filaments.
  • the nonwoven has a preferred strength in Longitudinal direction, i.e. in the direction of production, while the strength values in Transverse direction are lower. Due to the inclination of the spinning beam together with the laying and stretching device, this should be compensated.
  • the invention has for its object a method with associated Device to produce a spunbond with the very one high uniformity of the fleece structure and basis weight distribution can be achieved.
  • the Strength in the transverse direction should, for example, be the same as the strength in Longitudinal direction.
  • the invention is based on a method for producing a Spunbonded nonwoven by spinning a parallel one next to the other linear thread array in the form of a curtain from a variety of Spin capillaries with aerodynamic pulling and stretching of the Yarn sheet.
  • the stretching channel emerging or withdrawn from a spool of thread from an air stream moved laterally with periodically changing directions, the Air flow seen in a horizontal plane at an angle to the thread sheet is alternately aligned. Individual air blasts in changing directions cause the coulter to move back and forth across the production direction is moved, which leads to the desired fleece structure, for example one high uniformity in structure.
  • the air flows can be carried out alternately from left and right. It turned out to be favorable if between the individual air flows Air breaks are inserted, where there is no air blast and the one between the air blasts a vertical alignment of the thread sheet allow.
  • the general direction of air flow is perpendicular to the Thread cluster directed. This is a blow-out angle in the horizontal plane selected from 15 °. Other discharge angles are as needed of course possible.
  • the vertical discharge direction is also possible Align it diagonally downwards to the thread sheet.
  • the Blow-out angle in the vertical plane can be 15 °.
  • the device for performing the method consists of a Spinning beams with a large number of spinning capillaries lying in a row with a cooling air shaft and stretching duct and a storage belt.
  • a Spinning beams with a large number of spinning capillaries lying in a row with a cooling air shaft and stretching duct and a storage belt.
  • the air outlet nozzles are arranged so that they can alternately blow an air stream in different directions as seen from the left or right. It is favorable if at least two arranged parallel to each other Air outlet nozzle rows are provided, the nozzles one row are oriented opposite to the nozzles of the other row.
  • the Air is supplied to the nozzles one after the other, so that once the nozzles to the left and once the nozzles to the right are pressurized with air. For this, the air supply to the nozzles is one row at a time Closure completed. But it is also possible to use the nozzles yourself To provide closures and to close the nozzles one row at a time and open the other row.
  • a rotatable roller can be provided to close off the nozzles, which is hollow and provided with longitudinal slots.
  • the nozzles can be at an angle to their through corrugated sheet-like inserts Longitudinally extending corrugations are formed in the nozzle wall are inserted. They are preferably interchangeable, so that through them volume flow passing through or also the flow direction or whose angle can be easily changed.
  • the nozzle wall is provided with longitudinal slots lying one above the other correspond to the longitudinal slots in the roller.
  • a special one favorable embodiment provides the arrangement of an air storage space in Blow duct in front, between the nozzle wall and one on the roller lying sealing wall is arranged. This will make it a very even one Actuation of the nozzles reached.
  • the air storage space is divided into two chambers by an intermediate plate, which the respective upper and lower longitudinal slots of the sealing wall and are assigned to the upper and lower nozzles in the nozzle wall.
  • the roller in turn is in a longitudinal channel filled with compressed air arranged, which is connected to a compressed air reservoir.
  • the rotating roller has the advantage that even with larger ones Production widths a uniform pressure at the nozzles over the entire Production range is pending.
  • blow-out angles of the nozzles of both rows of nozzles are preferably the same, which means that the thread array has the same design in both directions is achieved.
  • the blow-out angles are 10 to 60 °, preferably 45 °.
  • an adjustable mechanical air duct to control the Direction of air flow may be provided below the Blasschachtes.
  • This air flow can pivotable wing flaps or consist of Coander shells, through which the thread sheet moves back and forth in the production direction can be.
  • the preferred embodiment provides opposite the blow shaft on the other front of the thread group Attach air baffle adjustable to blow duct direction. Because of this Air baffle supports the direction of lateral air flow and the lateral pivoting movement of the thread sheet can be stronger or less strong can be adjusted by moving the air baffle closer to the blow duct is introduced or removed from it.
  • FIG. 1 In Fig. 1, four individual steps A, B, C and D of the Procedure illustrated. Through the vertical lines 1 are Front walls of a blow duct 3 illustrated. With 2 is one Air baffle designated. The points 4 are the individual threads of the Play thread coulter. By arrow 5 is the direction of movement Storage tape displayed. The curved arrows 6 and 7 indicate the Flow direction of the air flow again.
  • the thread group is made up of the Threads 4 seen from their direction of production once to the right, see Step B, and once to the left, see Step D, moved. Between these Movements, the air flow is stopped, so that the thread coulter itself can align vertically, as shown in steps A and C. From the Blasschacht 3, which is seen in the production direction on the back of the Threads are located periodically from the nozzles provided once the air to the right, see step B, and once the air to the left, see step D, blown out. Located on the front of the thread family the air baffle 2, which is provided with an adjustment mechanism and whose distance from the blow chute 3 is adjustable.
  • the deposition of a single thread 4 is shown schematically at the bottom of the figure and it can be seen that the thread 4 is a when it is deposited Movement that results in the shape of an eight on the shelf.
  • Fig. 2 is the blow duct 3 with the one above the other in rows Air outlet nozzles 10 and 11 shown.
  • the from the stretching channel 12 emerging thread sheet 8 is through the emerging from the nozzles 10 Airflow initially deflected to the right, which is due to the extended Dashes of the thread group 8 is shown.
  • the thread coulter 8 is again aligned vertically and is in the further Step through the air flow from the air outlet nozzles 11 into the opposite direction, what with the dotted lines of the Thread cluster 8 is displayed. It should be noted that this representation only schematically represents the principle of the method.
  • nozzles 10 and 11 of the blow shaft 3 are in plan view shown. Arrows 6 and 7 indicate the direction of flow of the air flow on.
  • the blow duct 3 is equipped with an intermediate plate, which the separate spaces for the nozzles 10 and 11 from each other. This is it is possible to separate each room of the blow duct 3 with compressed air supply.
  • the Blasschacht 3 has that Nozzles 10 and 11 from which the air flows 6 and 7 emerge.
  • the Intermediate sheet 14 is the blow chute 3 in two chambers 15 and 16 divided, via which compressed air is fed to the nozzles 10 and 11.
  • the Blasschacht 3 opposite the air baffle 2 is attached, the suitable adjustment mechanisms moved towards the blow shaft 3 can be what is indicated by the double arrow 21.
  • the wing flap 22 is provided, which is about the axis 23 can be pivoted, as indicated by the arrow 24. From the stretching channel 12 emerging thread sheet 8 is by the Air flows from the air outlet nozzles 10 and 11 laterally back and forth emotional. Through the wing flap 22, the sheet 8 is additionally in Production direction swung back and forth. That on the storage belt 13 forming fleece has an exceptionally high uniformity and same basis weight distribution.
  • FIG. 5 shows the preferred embodiment, in which the hollow and roller 30 provided with slots 31 in the blow chute 3 in one separate longitudinal channel 40 is arranged.
  • an air storage space 32 is present, which in two over the intermediate plate 14 Chambers 15 and 16 is divided.
  • the nozzles 10 are in the nozzle wall 33 and 11 arranged in rows one above the other. They are made of corrugated iron Chambers 15 and 16 is divided.
  • the nozzles 10 are in the nozzle wall 33 and 11 arranged in rows one above the other. They are made of corrugated iron Deposits 35 formed, at an angle to their longitudinal direction (for Machine width) running corrugations. The deposits are 35 replaceable.
  • the sealing wall 34 has one above the other Longitudinal slots 36, which with the longitudinal slots 31 in the roller 30th correspond.
  • the longitudinal slots 31 and 36 are so on top of each other matched that the compressed air is only either the upper chamber 15 or the lower chamber 16 is supplied.
  • the air flow from the Longitudinal channel 40 in the chambers 15 and 16 can be varied.
  • the longitudinal channel 40 is connected via a plurality of connecting pieces 42 with one parallel to the Longitudinal channel 40 extending compressed air reservoir 41 connected.

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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)
  • Treatment Of Fiber Materials (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)

Abstract

To produce a spun-bonded nonwoven fabric, melt spun polymer filaments are delivered in a falling curtain parallel to each other with an aerodynamic take-off and drawing action. The band of filaments (8), taken from the drawing channel (12) or a bobbin, are carried by an airstream with periodic direction changes in lateral side movements. The airstream is aligned at an angle to the band of filaments, in an alternating sequence as seen on a horizontal plane. To produce a spun-bonded nonwoven fabric, there are pauses between the airstream flow direction changes. The air blowing direction is at right angles to the band of filaments, at 15 degrees to the horizontal plane and at a downwards angle of 15 degrees on the vertical plane. The air blowing direction is at the front or the rear of the band of filaments. After movement through the alternating airstream flows, the filaments are given an additional movement through guide surfaces which have a periodic filament deflection action e.g. swing flaps and the like. An Independent claim is included for an assembly to produce spun-bonded nonwoven fabrics with at least one blower shaft (3) under the drawing channel, in front of and/or behind the band of filaments. It has air outlet jets (10,11) aligned at an angle to the band of filaments. Preferred Features: The air blower jets are in at least two parallel rows, with the jets in one row on an opposing orientation to the jets of the other row. The air flow can be blocked to each of the air jet rows, using a hollow rotating roller fitted with longitudinal slits. The roller is within a longitudinal channel, filled with compressed air and linked to a compressed air supply. The air jets can be formed by exchangeable corrugated sheet inserts, with the corrugations at an angle to the longitudinal axis of the sheets, laid in the jet wall. The sealing wall has overlaid longitudinal slits, which correspond with the slits in the hollow roller. The blower shaft has an air build-up zone, between the jet and sealing walls to the roller. The air build-up zone is separated into two chambers (15,16) by a dividing wall (14), for the upper and lower slits and jets. The jets deliver airstreams at the same angle in each row of 10-60 degrees and preferably 45 degrees . An adjustable air guide plate (2) is at the side of the band of filaments opposite the blower shaft, in the air blowing direction. An adjustable and mechanical air guide is under the blower shaft, to control the airstream flow direction, using a swing wing flap (22) or shells.

Description

Technisches GebietTechnical field

Für die Erstellung von Spinnvliesen sind verschiedene Verfahren und dafür geeignete Vorrichtungen bekannt. Als Ausgangsmaterialien werden thermoplastische Polymere verwendet, die aufgeschmolzen zu feinen Spinnfäden versponnen werden. Die ersponnenen Fäden werden meist aerodynamisch verstreckt und erhalten dadurch die gewünschte Festigkeit. Die Ablage der Fäden erfolgt nach dem Spinnvorgang oder auch unter Zwischenschaltung von Spulen auf einem Ablageband auf dem sie übereinander zu liegen kommen und das Spinnvlies bilden.There are various processes for creating spunbonded nonwovens suitable devices known. As starting materials are thermoplastic polymers used that melted to fine Spun threads are spun. The spun threads are mostly stretched aerodynamically and thereby obtain the desired strength. The threads are deposited after the spinning process or under Interposition of coils on a storage belt on which they come to lie on top of each other and form the spunbond.

Stand der TechnikState of the art

In der DE-AS 1 303 569 ist ein Verfahren zum Herstellen von Vliesen bekannt bei dem die ausgesponnenen Fäden durch einen Kanal geführt werden, dort aerodynamisch verstreckt werden und danach auf einer perforierten, sich fortbewegenden Unterlage in Vliesform abgelegt werden. DE-AS 1 303 569 describes a process for producing nonwovens known in which the spun threads are guided through a channel be stretched aerodynamically there and then on one perforated, moving pad in fleece form.

Um die statistisch ungeordnete Ablage der Fäden zu gewährleisten, ist unterhalb des Luftführungskanals eine Turbulenzzone vorgesehen, die ein Überkreuzlegen der Fäden unterstützt. Es entsteht ein sehr unregelmäßiges Vliesbild. Eine hohe Gleichmäßigkeit des Spinnvlieses wird dadurch erreicht, dass hintereinander mehrere Führungskanäle vorgesehen und die daraus hervortretenden Fadenscharen schichtmäßig übereinander zu einem Vlies abgelegt werden.To ensure the statistically unordered filing of the threads is A turbulence zone is provided below the air duct Cross-threading supported. The result is a very irregular one Fleece image. A high uniformity of the spunbond is achieved that several guide channels are provided in succession and the resulting channels protruding layers of thread in layers one above the other to form a fleece be filed.

Um die angestrebte Gleichmäßigkeit des Vlieses und seine Festigkeit in Längs- oder Querrichtung bestimmen zu können, ist aus der DE 39 07 215 A1 bekannt, die Spinnbalken mitsamt der Fadenabzugsvorrichtung drehbar auszubilden. Hierdurch sollen auch die Nachteile behoben werden, die beim sogenannten Vorhangverfahren auftreten und die in bestimmten Bereichen zu Überlagerungen einzelner Filamenten führen können. Beim Vorhangverfahren besitzt das Vlies eine bevorzugte Festigkeit in Längsrichtung, d.h. in Produktionsrichtung, während die Festigkeitswerte in Querrichtung geringer sind. Durch die Schrägstellung der Spinnbalken mitsamt der Ablege- und Streckvorrichtung soll dieses ausgeglichen werden.To achieve the desired uniformity of the fleece and its strength in To be able to determine the longitudinal or transverse direction is known from DE 39 07 215 A1 known, the spinning beam together with the thread take-off device rotatable train. This should also eliminate the disadvantages that the So-called curtain procedures occur and in certain areas can lead to overlays of individual filaments. At the Curtain method, the nonwoven has a preferred strength in Longitudinal direction, i.e. in the direction of production, while the strength values in Transverse direction are lower. Due to the inclination of the spinning beam together with the laying and stretching device, this should be compensated.

Bekannt ist außerdem durch die DE 35 42 660 C2 unterhalb des Abzugskanals eine Ablenkung des Luftstroms mit Hilfe einer parallel angeordneten Schwenkvorrichtung zu erreichen um dadurch eine Pendelbewegung der Fäden zu erzielen. Die Schwenkbewegung erfolgt in Laufrichtung des Ablagebandes in Produktionsrichtung; u.a. können hier auch sogenannte Coanderschalen Verwendung finden wie sie beispielsweise in der DE 24 21 401 C3 beschrieben sind. Die vorgesehenen Maßnahmen sind jedoch relativ träge, so dass nur langsame Schwingungen der Fadenschar möglich sind. It is also known from DE 35 42 660 C2 below the Duct a deflection of the air flow with the help of a parallel arranged pivoting device to achieve a Achieve pendulum movement of the threads. The swivel movement takes place in Direction of the conveyor belt in the direction of production; et al can here so-called Coander shells are also used, for example are described in DE 24 21 401 C3. The proposed measures are however relatively sluggish, so that only slow vibrations of the Threads are possible.

Darstellung der ErfindungPresentation of the invention

Der Erfindung liegt die Aufgabe zugrunde ein Verfahren mit dazugehöriger Vorrichtung zur Herstellung eines Spinnvlieses zu schaffen mit dem eine sehr hohe Gleichmäßigkeit- der Vliesstruktur und Flächengewichtsverteilung erreicht werden kann. Darüber hinaus soll es möglich sein, die Längs- bzw. Querfestigkeit des Vlieses in vorgegebener Weise herzustellen. Die Festigkeit in Querrichtung soll beispielsweise gleich groß wie die Festigkeit in Längsrichtung sein.The invention has for its object a method with associated Device to produce a spunbond with the very one high uniformity of the fleece structure and basis weight distribution can be achieved. In addition, it should be possible to Manufacture cross-strength of the fleece in a predetermined manner. The Strength in the transverse direction should, for example, be the same as the strength in Longitudinal direction.

Die Lösung der gestellten Aufgabe erfolgt mit den Merkmalen der Ansprüche 1 und 8. Die Unteransprüche 2 bis 7 und 9 bis 25 sind vorteilhafte Weiterbildungen des Erfindungsgedankens.The problem is solved with the features of the claims 1 and 8. The subclaims 2 to 7 and 9 to 25 are advantageous Developments of the inventive concept.

Die Erfindung geht aus von einem Verfahren zur Herstellung eines Spinnvlieses durch Ausspinnen einer parallel nebeneinander angeordneten linearen Fadenschar in Form eines Vorhangs aus einer Vielzahl von Spinnkapilaren mit aerodynamischem Abziehen und Verstrecken der Fadenschar. Gemäß der Erfindung wird die aus dem Verstreckungskanal austretende oder einer Spule abgezogene Fadenschar von einem Luftstrom mit periodisch wechselnden Richtungen seitlich quer bewegt, wobei der Luftstrom in horizontaler Ebene gesehen schräg zur Fadenschar abwechselnd ausrichtet ist. Einzelne Luftstöße in wechselnden Richtungen bewirken, dass die Fadenschar quer zur Produktionsrichtung hin- und herbewegt wird, was zu der gewollten Vliesstruktur führt, beispielsweise eine hohe Gleichmäßigkeit in der Struktur.The invention is based on a method for producing a Spunbonded nonwoven by spinning a parallel one next to the other linear thread array in the form of a curtain from a variety of Spin capillaries with aerodynamic pulling and stretching of the Yarn sheet. According to the invention, the stretching channel emerging or withdrawn from a spool of thread from an air stream moved laterally with periodically changing directions, the Air flow seen in a horizontal plane at an angle to the thread sheet is alternately aligned. Individual air blasts in changing directions cause the coulter to move back and forth across the production direction is moved, which leads to the desired fleece structure, for example one high uniformity in structure.

Die Luftströme können abwechselnd von links und rechts ausgeführt werden. Als günstig erwies sich, wenn zwischen den einzelnen Luftströmen Luftpausen eingefügt sind, bei denen kein Luftstoß vorhanden ist und die ein zwischen den Luftstößen ein senkrechtes Ausrichten der Fadenschar gestatten.The air flows can be carried out alternately from left and right. It turned out to be favorable if between the individual air flows Air breaks are inserted, where there is no air blast and the one between the air blasts a vertical alignment of the thread sheet allow.

Die generelle Ausblasrichtung der Luftströme ist senkrecht auf die Fadenschar gerichtet. Dabei wird ein Ausblaswinkel in horizontaler Ebene von 15° gewählt. Andere Ausblaswinkel sind je nach Bedarf selbstverständlich möglich. Möglich ist auch die Ausblasrichtung in vertikaler Ebene schräg nach unten auf die Fadenschar auszurichten. Der Ausblaswinkel in vertikaler Ebene kann 15° betragen.The general direction of air flow is perpendicular to the Thread cluster directed. This is a blow-out angle in the horizontal plane selected from 15 °. Other discharge angles are as needed of course possible. The vertical discharge direction is also possible Align it diagonally downwards to the thread sheet. The Blow-out angle in the vertical plane can be 15 °.

Es ist ausreichend, wenn die Luftströme von der Vorderfront auf die Fadenschar gerichtet sind. Dieses schließt jedoch nicht aus, dass der Luftstrom auch von der Hinterfront oder von beiden Frontseiten auf die Fadenschar gerichtet werden kann. Dieses ist unter anderem abhängig von der Stärke der einzelnen Fäden und von den vorhandenen Strömungsverhältnissen für die Luftstöße. Gegebenenfalls kann der Ablagevorgang zusätzlich noch durch periodisch bewegte Strömungsleitflächen wie Schwenkklappen, Coanderschalen oder dergleichen unterstützt werden. Diese werden wie bereits im Stand der Technik bekannt so angeordnet, dass sie in Produktionsrichtung die Fadenschar zusätzlich hin und her schwenken.It is sufficient if the air flows from the front to the front Threads are directed. However, this does not exclude that the Airflow also from the rear or from both front sides to the Thread coulter can be directed. Among other things, this depends on the strength of the individual threads and the existing ones Flow conditions for the air blasts. If necessary, the Filing process additionally by periodically moving Flow control surfaces such as swivel flaps, Coander shells or the like are supported. As in the state of the Technology known to be arranged in the direction of production Swing the thread coulter back and forth in addition.

Die Vorrichtung zur Durchführung des Verfahrens besteht aus einem Spinnbalken mit einer Vielzahl von in einer Reihe liegenden Spinnkapilaren mit einem Kühlluftschacht und Verstreckungskanal und einem Ablageband. Gemäß der Erfindung ist unterhalb des Verstreckungskanals vor und / oder hinter der Fadenschar mindestens ein Blasschacht angeordnet mit in horizontaler Ebene gesehen schräg zur Fadenschar ausgerichteten Luftaustrittsdüsen. Die Luftaustrittsdüsen sind so angeordnet, dass sie wechselweise einen Luftstrom in unterschiedliche Richtungen blasen können und zwar auf die Fadenschar gesehen von links oder rechts. Dabei ist es günstig, wenn mindestens zwei parallel zueinander angeordnete Luftaustrittsdüsenreihen vorgesehen sind, wobei die Düsen einer Reihe entgegengesetzt zu den Düsen der anderen Reihe ausgerichtet sind. Die Luftzufuhr zu den Düsen erfolgt nacheinander, so dass einmal die Düsen nach links und einmal die Düsen nach rechts mit der Luft beaufschlagt sind. Hierfür wird die Luftzufuhr zu den Düsen jeweils einer Reihe durch einen Verschluss abgeschlossen. Möglich ist aber auch, die Düsen selbst mit Verschlüssen zu versehen und die Düsen jeweils einer Reihe abzuschließen und die andere Reihe zu öffnen.The device for performing the method consists of a Spinning beams with a large number of spinning capillaries lying in a row with a cooling air shaft and stretching duct and a storage belt. According to the invention is below and below the stretching channel and / or at least one blow duct arranged behind the thread sheet with in horizontal plane seen obliquely to the thread sheet Air outlet nozzles. The air outlet nozzles are arranged so that they can alternately blow an air stream in different directions as seen from the left or right. It is favorable if at least two arranged parallel to each other Air outlet nozzle rows are provided, the nozzles one row are oriented opposite to the nozzles of the other row. The Air is supplied to the nozzles one after the other, so that once the nozzles to the left and once the nozzles to the right are pressurized with air. For this, the air supply to the nozzles is one row at a time Closure completed. But it is also possible to use the nozzles yourself To provide closures and to close the nozzles one row at a time and open the other row.

Für den Abschluss der Düsen kann eine drehbare Walze vorgesehen sein, die hohl ausgebildet und mit Längsschlitzen versehen ist.A rotatable roller can be provided to close off the nozzles, which is hollow and provided with longitudinal slots.

Die Düsen können durch wellblechartige Einlagen mit schräg zu ihrer Längsrichtung verlaufenden Wellungen gebildet sein, die in die Düsenwand eingelegt sind. Sie sind vorzugsweise auswechselbar, so dass der durch sie hindurchtretende Volumenstrom oder auch die Strömungsrichtung oder deren Winkel leicht verändert werden kann.The nozzles can be at an angle to their through corrugated sheet-like inserts Longitudinally extending corrugations are formed in the nozzle wall are inserted. They are preferably interchangeable, so that through them volume flow passing through or also the flow direction or whose angle can be easily changed.

Die Düsenwand ist mit übereinander liegenden Längsschlitzen versehen, die mit den Längsschlitzen in der Walze korrespondieren. Eine besonders günstige Ausführungsform sieht die Anordnung eines Luftstauraumes im Blasschacht vor, der zwischen der Düsenwand und einer an der Walze liegenden Abdichtwand angeordnet ist. Dadurch wird eine sehr gleichmäßige Beaufschlagung der Düsen erreicht. The nozzle wall is provided with longitudinal slots lying one above the other correspond to the longitudinal slots in the roller. A special one favorable embodiment provides the arrangement of an air storage space in Blow duct in front, between the nozzle wall and one on the roller lying sealing wall is arranged. This will make it a very even one Actuation of the nozzles reached.

Der Luftstauraum ist durch ein Zwischenblech in zwei Kammern aufgeteilt, die den jeweilig oberen und unteren Längsschlitzen der Abdichtwand und den oberen und unteren Düsen in der Düsenwand zugeordnet sind. Die Walze ihrerseits ist dabei in einem mit Druckluft gefüllten Längskanal angeordnet, der mit einem Druckluftspeicher verbunden ist.The air storage space is divided into two chambers by an intermediate plate, which the respective upper and lower longitudinal slots of the sealing wall and are assigned to the upper and lower nozzles in the nozzle wall. The The roller in turn is in a longitudinal channel filled with compressed air arranged, which is connected to a compressed air reservoir.

Die rotierende Walze hat den Vorteil, dass auch bei größeren Produktionsbreiten ein gleichmäßiger Druck an den Düsen über die gesamte Produktionsbreite ansteht.The rotating roller has the advantage that even with larger ones Production widths a uniform pressure at the nozzles over the entire Production range is pending.

Die Ausblaswinkel der Düsen beider Düsenreihen sind vorzugsweise gleich, wodurch an der Fadenschar in beiden Richtungen eine gleiche Auslegung erreicht wird. Die Ausblaswinkel betragen 10 bis 60°, bevorzugt 45°.The blow-out angles of the nozzles of both rows of nozzles are preferably the same, which means that the thread array has the same design in both directions is achieved. The blow-out angles are 10 to 60 °, preferably 45 °.

Zur weiteren Unterstützung des Vlieslegeverfahrens kann unterhalb des Blasschachtes eine verstellbare mechanische Luftführung zur Steuerung der Richtung der Luftströmung vorgesehen sein. Diese Luftführung kann aus schwenkbaren Flügelklappen oder auch aus Coanderschalen bestehen, durch welche die Fadenschar in Produktionsrichtung hin- und herbewegt werden kann.To further support the nonwoven laying process, below the Blasschachtes an adjustable mechanical air duct to control the Direction of air flow may be provided. This air flow can pivotable wing flaps or consist of Coander shells, through which the thread sheet moves back and forth in the production direction can be.

Zur Unterstützung der Luftführung sieht die bevorzugte Ausführungsform vor, dem Blasschacht gegenüber auf der anderen Front der Fadenschar ein in Blasschachtrichtung verstellbares Luftleitblech anzubringen. Durch dieses Luftleitblech wird die Richtung der seitlichen Luftströmung unterstützt und die seitliche Schwenkbewegung der Fadenschar kann stärker oder weniger stark eingestellt werden, in dem das Luftleitblech näher an den Blasschacht herangeführt wird oder davon entfernt wird. To support the air flow, the preferred embodiment provides opposite the blow shaft on the other front of the thread group Attach air baffle adjustable to blow duct direction. Because of this Air baffle supports the direction of lateral air flow and the lateral pivoting movement of the thread sheet can be stronger or less strong can be adjusted by moving the air baffle closer to the blow duct is introduced or removed from it.

Kurzbeschreibung der ZeichnungBrief description of the drawing

Anhand der Zeichnung wird die Erfindung nachstehend näher erläutert:The invention is explained in more detail below with the aid of the drawing:

Es zeigt:

  • Fig. 1 schematisch den Verfahrensablauf,
  • Fig. 2 schematisch den Blasschacht mit abgelenkter Fadenschar,
  • Fig. 3 Luftaustrittsdüsen des Blasschachtes in der Draufsicht,
  • Fig. 4 den Verstreckungskanal mit Blasschacht und Luftführungen in der teilweisen perspektivischen Ansicht und
  • Fig. 5 den Blasschacht mit einem Luftstauraum.
    • It shows:
  • 1 schematically shows the process flow,
  • 2 schematically shows the blow chute with the thread sheet deflected,
  • 3 air outlet nozzles of the blow shaft in plan view,
  • Fig. 4 shows the stretching channel with blow duct and air ducts in a partial perspective view
  • Fig. 5 the blow duct with an air storage space.

    • Ausführung der ErfindungImplementation of the invention

    In der Fig. 1 sind schematisch vier Einzelschritte A, B, C und D des Verfahrens dargestellt. Durch die senkrechten Striche 1 sind die Frontwandungen eines Blasschachtes 3 veranschaulicht. Mit 2 ist ein Luftleitblech bezeichnet. Die Punkte 4 sollen die einzelnen Fäden der Fadenschar wiedergeben. Durch den Pfeil 5 ist die Bewegungsrichtung des Ablagebandes angezeigt. Die gebogenen Pfeile 6 und 7 geben die Strömungsrichtung des Luftstroms wieder. In Fig. 1, four individual steps A, B, C and D of the Procedure illustrated. Through the vertical lines 1 are Front walls of a blow duct 3 illustrated. With 2 is one Air baffle designated. The points 4 are the individual threads of the Play thread coulter. By arrow 5 is the direction of movement Storage tape displayed. The curved arrows 6 and 7 indicate the Flow direction of the air flow again.

    Bei dem im Beispiel gewählten Verfahren wird die Fadenschar aus den Fäden 4 von ihrer Produktionsrichtung gesehen einmal nach rechts, siehe Schritt B, und einmal nach links, siehe Schritt D, bewegt. Zwischen diesen Bewegungen wird der Luftstrom gestoppt, so dass die Fadenschar sich senkrecht ausrichten kann, wie in den Schritten A und C gezeigt. Aus dem Blasschacht 3, der sich in Produktionsrichtung gesehen an der Rückfront der Fadenschar befindet, wird periodisch aus den dafür vorgesehenen Düsen einmal die Luft nach rechts, siehe Schritt B, und einmal die Luft nach links, siehe Schritt D, ausgeblasen. An der Vorderfront der Fadenschar befindet sich das Luftleitblech 2, welches mit einem Verstellmechanismus versehen ist und dessen Abstand vom Blasschacht 3 einstellbar ist.In the method chosen in the example, the thread group is made up of the Threads 4 seen from their direction of production once to the right, see Step B, and once to the left, see Step D, moved. Between these Movements, the air flow is stopped, so that the thread coulter itself can align vertically, as shown in steps A and C. From the Blasschacht 3, which is seen in the production direction on the back of the Threads are located periodically from the nozzles provided once the air to the right, see step B, and once the air to the left, see step D, blown out. Located on the front of the thread family the air baffle 2, which is provided with an adjustment mechanism and whose distance from the blow chute 3 is adjustable.

    Unten auf der Figur ist schematisch die Ablage eines einzelnen Fadens 4 eingezeichnet und es ist erkennbar, dass der Faden 4 bei seiner Ablage eine Bewegung vollführt, die etwa die Form einer Acht auf der Ablage ergibt.The deposition of a single thread 4 is shown schematically at the bottom of the figure and it can be seen that the thread 4 is a when it is deposited Movement that results in the shape of an eight on the shelf.

    In der Fig. 2 ist der Blasschacht 3 mit den übereinander in Reihen liegenden Luftaustrittsdüsen 10 und 11 gezeigt. Die aus dem Verstreckungskanal 12 austretende Fadenschar 8 wird durch den aus den Düsen 10 austretenden Luftstrom zunächst nach rechts abgelenkt, was durch die ausgezogenen Striche der Fadenschar 8 angezeigt ist. Nach Wegnahme des Luftstroms richtet sich die Fadenschar 8 wieder senkrecht aus und wird im weiteren Schritt durch den Luftstrom aus den Luftaustrittsdüsen 11 in die entgegengesetzte Richtung abgelenkt, was mit den punktierten Strichen der Fadenschar 8 angezeigt ist. Es sei bemerkt, dass diese Darstellung nur schematisch das Prinzip des Verfahrens wiedergibt.In Fig. 2 is the blow duct 3 with the one above the other in rows Air outlet nozzles 10 and 11 shown. The from the stretching channel 12 emerging thread sheet 8 is through the emerging from the nozzles 10 Airflow initially deflected to the right, which is due to the extended Dashes of the thread group 8 is shown. After removing the air flow the thread coulter 8 is again aligned vertically and is in the further Step through the air flow from the air outlet nozzles 11 into the opposite direction, what with the dotted lines of the Thread cluster 8 is displayed. It should be noted that this representation only schematically represents the principle of the method.

    In der Fig. 3 sind die Düsen 10 und 11 des Blasschachtes 3 in der Draufsicht gezeigt. Die Pfeile 6 und 7 geben die Strömungsrichtung der Luftströmung an. Der Blasschacht 3 ist mit einem Zwischenblech ausgestattet, der die jeweiligen Räume für die Düsen 10 und 11 voneinander trennt. Dadurch ist es möglich, jeden Raum des Blasschachtes 3 getrennt mit Druckluft zu versorgen.In Fig. 3, the nozzles 10 and 11 of the blow shaft 3 are in plan view shown. Arrows 6 and 7 indicate the direction of flow of the air flow on. The blow duct 3 is equipped with an intermediate plate, which the separate spaces for the nozzles 10 and 11 from each other. This is it is possible to separate each room of the blow duct 3 with compressed air supply.

    In der Fig. 4 ist eine Zusammenstellung von Verstreckungskanal 12, Blasschacht 3 und Ablageband 13 wiedergegeben. Der Blasschacht 3 hat die Düsen 10 und 11 aus denen die Luftströme 6 und 7 austreten. Durch das Zwischenblech 14 ist der Blasschacht 3 in zwei Kammern 15 und 16 unterteilt, über die Druckluft den Düsen 10 und 11 zugeführt wird. Dem Blasschacht 3 gegenüberliegend ist das Luftleitblech 2 angebracht, das über geeignete Stellmechanismen in Richtung auf den Blasschacht 3 verschoben werden kann, was durch den Doppelpfeil 21 angezeigt ist. Unterhalb des Luftleitblechs 2 ist die Flügelklappe 22 vorgesehen, die um die Achse 23 verschwenkt werden kann, wie das mit dem Pfeil 24 angedeutet ist. Die aus dem Verstreckungskanal 12 austretende Fadenschar 8 wird durch die Luftströme aus den Luftaustrittsdüsen 10 und 11 seitlich quer hin und her bewegt. Durch die Flügelklappe 22 wird die Fadenschar 8 zusätzlich in Produktionsrichtung hin- und her geschwenkt. Das auf dem Ablageband 13 sich bildende Vlies hat eine außergewöhnlich hohe Gleichmäßigkeit und gleiche Flächengewichtsverteilung.4 is a compilation of stretching channel 12, Blow duct 3 and storage belt 13 reproduced. The Blasschacht 3 has that Nozzles 10 and 11 from which the air flows 6 and 7 emerge. By the Intermediate sheet 14 is the blow chute 3 in two chambers 15 and 16 divided, via which compressed air is fed to the nozzles 10 and 11. the Blasschacht 3 opposite the air baffle 2 is attached, the suitable adjustment mechanisms moved towards the blow shaft 3 can be what is indicated by the double arrow 21. Below the Air baffle 2, the wing flap 22 is provided, which is about the axis 23 can be pivoted, as indicated by the arrow 24. From the stretching channel 12 emerging thread sheet 8 is by the Air flows from the air outlet nozzles 10 and 11 laterally back and forth emotional. Through the wing flap 22, the sheet 8 is additionally in Production direction swung back and forth. That on the storage belt 13 forming fleece has an exceptionally high uniformity and same basis weight distribution.

    In der Fig. 5 ist die bevorzugte Ausführungsform gezeigt, bei der die hohle und mit Schlitzen 31 versehene Walze 30 im Blasschacht 3 in einem separaten Längskanal 40 angeordnet ist. Zwischen der Düsenwand 33 des Blasschachts 3 und einer Abdichtwand 34, an der die Walze 30 anliegt, ist ein Luftstauraum 32 vorhanden, der über das Zwischenblech 14 in zwei Kammern 15 und 16 unterteilt ist. In der Düsenwand 33 sind die Düsen 10 und 11 in Reihen übereinander angeordnet. Sie werden durch wellblechartige Kammern 15 und 16 unterteilt ist. In der Düsenwand 33 sind die Düsen 10 und 11 in Reihen übereinander angeordnet. Sie werden durch wellblechartige Einlagen 35 gebildet, mit schräg zu ihrer Längsrichtung (zur Maschinenbreite) verlaufenden Wellungen. Die Einlagen 35 sind auswechselbar. Die Abdichtwand 34 hat übereinander liegende Längsschlitze 36, die mit den Längsschlitzen 31 in der Walze 30 korrespondieren. Die Längsschlitze 31 und 36 sind so aufeinander abgestimmt, dass die Druckluft nur entweder der oberen Kammer 15 oder der unteren Kammer 16 zugeführt wird. Dabei können Zwischenpausen eingelegt werden, durch Überdeckung der Schlitze 36 durch die Walzenwandung, welche ein senkrechtes Ausrichten der Fäden 8 erlauben. Je nach dem Verhältnis der Längsschlitze 31 und der Walzenwandung und der Schlitze 36 in der Abdichtwand 34 kann die Luftströmung aus dem Längskanal 40 in die Kammern 15 und 16 variiert werden. Das Längskanal 40 ist über mehrere Anschlussstutzen 42 mit einem sich parallel zum Längskanal 40 erstreckender Druckluftspeicher 41 verbunden.5 shows the preferred embodiment, in which the hollow and roller 30 provided with slots 31 in the blow chute 3 in one separate longitudinal channel 40 is arranged. Between the nozzle wall 33 of the Blow chute 3 and a sealing wall 34 against which the roller 30 abuts an air storage space 32 is present, which in two over the intermediate plate 14 Chambers 15 and 16 is divided. The nozzles 10 are in the nozzle wall 33 and 11 arranged in rows one above the other. They are made of corrugated iron Chambers 15 and 16 is divided. The nozzles 10 are in the nozzle wall 33 and 11 arranged in rows one above the other. They are made of corrugated iron Deposits 35 formed, at an angle to their longitudinal direction (for Machine width) running corrugations. The deposits are 35 replaceable. The sealing wall 34 has one above the other Longitudinal slots 36, which with the longitudinal slots 31 in the roller 30th correspond. The longitudinal slots 31 and 36 are so on top of each other matched that the compressed air is only either the upper chamber 15 or the lower chamber 16 is supplied. There can be breaks be inserted by covering the slots 36 through the Roller wall, which allow the threads 8 to be aligned vertically. Depending on the ratio of the longitudinal slots 31 and the roller wall and the slots 36 in the sealing wall 34, the air flow from the Longitudinal channel 40 in the chambers 15 and 16 can be varied. The longitudinal channel 40 is connected via a plurality of connecting pieces 42 with one parallel to the Longitudinal channel 40 extending compressed air reservoir 41 connected.

    Claims (25)

    1. A process for producing a spunbonded web by spinning a parallel side-by-side linear filament sheet in the form of a curtain from a multiplicity of spinning capillaries using aerodynamic take-off and drawing of the filament sheet, the filament sheet, which emerges from the drawing duct or is taken off a bobbin, being moved laterally crosswise by an airstream which has periodically changing directions and which is alternately directed at an angle to the filament sheet as viewed in the horizontal plane, characterised in that there are pauses between the airstreams to permit perpendicular orientation of the filament sheet (8).
    2. A process for producing a spunbonded web according to claim 1, characterised in that the blow-out direction is perpendicular to the filament sheet (8).
    3. A process for producing a spunbonded web according to claim 2, characterised in that the blow-out angle in the horizontal plane is 15°.
    4. A process for producing a spunbonded web according to claim 3, characterised in that the blow-out direction in the vertical plane is at an angle downward towards the filament sheet (8).
    5. A process for producing a spunbonded web according to claim 4, characterised in that the blow-out angle in the vertical plane is 15°.
    6. A process for producing a spunbonded web according to any one of claims 1 to 5, characterised in that the airstream is directed towards the filament sheet (8) from the front or from the rear thereof.
    7. A process for producing a spunbonded web according to any one of claims 1 to 6, characterised in that the filament sheet (8) is deflected by periodically moving flow control surfaces such as pivoting flaps, Coanda surfaces or the like downstream of the airstream movement.
    8. Apparatus for carrying out the process according to any one of claims 1 to 7, comprising a spinning beam having a multiplicity of rowed spinning capillaries, a cooling air shaft and drawing duct and a laydown belt and also at least one blowing shaft which is disposed below the drawing duct, which has air outlet nozzles directed at an angle to the filament sheet as viewed in the horizontal plane and which is provided with at least two mutually parallel air outlet nozzle rows, the nozzles of one row being oriented opposite to the nozzles of the other row.
    9. Apparatus according to claim 8, characterised in that the air supply to the nozzles (10, 11) of any one row is closeable by one closure.
    10. Apparatus according to claim 8 or 9, characterised in that the nozzles (10, 11) of any one row are closeable by one closure.
    11. Apparatus according to claim 10, characterised in that the nozzles (10, 11) are closeable by a rotatable roll (3).
    12. Apparatus according to claim 11, characterised in that the roll (30) is hollow and provided with longitudinal slots (31).
    13. Apparatus according to claim 12, characterised in that the nozzles (10, 11) are formed by inserts (35) which resemble corrugated sheet metal, which have corrugations extending at an angle to their longitudinal direction and which have been inserted in the nozzle wall (33).
    14. Apparatus according to claim 13, characterised in that the inserts (35) are replaceable.
    15. Apparatus according to claim 14, characterised in that the sealing wall (34) is provided with superposed longitudinal slots (36) which correspond to the longitudinal slots (31) in the roll (30).
    16. Apparatus according to claim 11, characterised in that the blowing shaft (3) has an air accumulation space (32) which is located between the nozzle wall (33) and a sealing wall (34) which seals off with regard to the roll (30).
    17. Apparatus according to claim 16, characterised in that the air accumulation space (32) is divided by an intermediate metal sheet (14) into two chambers (15, 16) which are assigned to the respectively upper and lower longitudinal slots (36) and nozzles (35).
    18. Apparatus according to any one of claims 11 to 17, characterised in that the roll (30) is disposed in a longitudinal duct (4) which is filled with compressed air.
    19. Apparatus according to claim 18, characterised in that the longitudinal duct (40) is connected to a compressed air reservoir (41).
    20. Apparatus according to either of claims 8 and 9, characterised in that the blow-out angles of the nozzles (10, 11) of any one row of nozzles are the same.
    21. Apparatus according to claim 20, characterised in that the blow-out angles are from 10 to 60° and preferably 45°.
    22. Apparatus according to any one of claims 8 to 21, characterised in that an air control metal sheet (2) which is adjustable in the blowing shaft direction is disposed opposite the blowing shaft (1) on the other front side of the filament sheet (8).
    23. Apparatus according to any one of claims 8 to 22, characterised in that an adjustable mechanical air router for controlling the direction of the airstream is provided below the blowing shaft (3).
    24. Apparatus according to any one of claims 8 to 23, characterised in that the air router comprises a pivotable wing flap (22).
    25. Apparatus according to any one of claims 8 to 24, characterised in that the air router comprises Coanda surfaces.
    EP01113039A 2000-07-25 2001-05-29 Method and apparatus for making a spunbonded nonwoven Expired - Lifetime EP1178142B1 (en)

    Applications Claiming Priority (2)

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    DE10036047 2000-07-25
    DE10036047 2000-07-25

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    EP (1) EP1178142B1 (en)
    JP (1) JP3581842B2 (en)
    AT (1) ATE245217T1 (en)
    CA (1) CA2354050C (en)
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    DE102008053919B4 (en) * 2008-09-10 2012-10-04 Carl Freudenberg Kg Process and plant for the production of nonwovens and nonwovens
    DE502012009274C5 (en) * 2011-10-22 2022-01-20 Oerlikon Textile Gmbh & Co. Kg Device and method for guiding and depositing synthetic filaments into a web

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    CA2354050C (en) 2006-10-31
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    JP3581842B2 (en) 2004-10-27
    CA2354050A1 (en) 2002-01-25
    US20020043739A1 (en) 2002-04-18
    DE10133790A1 (en) 2002-03-28
    EP1178142A1 (en) 2002-02-06
    ATE245217T1 (en) 2003-08-15
    PL202460B1 (en) 2009-06-30
    DE10133790B4 (en) 2008-11-20
    JP2002088632A (en) 2002-03-27
    TW587115B (en) 2004-05-11
    PT102643A (en) 2002-01-30
    US20050098266A1 (en) 2005-05-12
    US6887331B2 (en) 2005-05-03
    PL348710A1 (en) 2002-01-28

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