EP0150024A2 - Apparatus for the manufacture of a spun-bonded fabric - Google Patents

Apparatus for the manufacture of a spun-bonded fabric Download PDF

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Publication number
EP0150024A2
EP0150024A2 EP85100268A EP85100268A EP0150024A2 EP 0150024 A2 EP0150024 A2 EP 0150024A2 EP 85100268 A EP85100268 A EP 85100268A EP 85100268 A EP85100268 A EP 85100268A EP 0150024 A2 EP0150024 A2 EP 0150024A2
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Prior art keywords
pressure chamber
shaft
spun
filaments
melt
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EP85100268A
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German (de)
French (fr)
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EP0150024A3 (en
Inventor
Wolfgang Greiser
Hans Dr. Wagner
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Hoechst AG
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Hoechst AG
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    • 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)

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  • the invention relates to a device for producing a spunbonded web by pneumatic drawing and depositing of melt-spun filaments, consisting of an overpressure chamber with outlet openings for the filaments, which is connected in a gastight manner to the melt spinning nozzle.
  • the diameter of these channels must be chosen to be relatively large in order to enable the piecing process, in which the freshly spun filaments are guided through the outlet openings with the aid of thin wires from the outlet end. This piecing process also prohibits longer channel lengths.
  • the object of the present invention is therefore to provide a device which is suitable for curtain spinning, i.e. a row arrangement of the spinneret holes is suitable and facilitates the start-up process.
  • the device according to the invention consists of a pressure chamber known per se below the row spinneret, which then tapers slightly conically to a drawing shaft 19 of constant width, which preferably has a length of more than 1 m.
  • the opening angle ⁇ of the weakly conical part 10 of the pressure chamber is preferably less than 7 °.
  • the air supply to the overpressure chamber is particularly preferably carried out by two horizontally arranged rows of blowing nozzles, consisting of sintered metal bodies, by means of which the air flow is preferably deflected in the direction of the thread.
  • the stretching shaft 19 with a constant width preferably contains an expanding end part 13 at its outlet end.
  • At least one side of the conical part 10 of the pressure chamber and the drafting shaft 19 is movable.
  • the device according to the invention is particularly suitable for curtain spinning systems with a linear arrangement of the spinneret holes over the entire width of the fleece, as described in DE-AS 20 48 006.
  • the device according to the invention then also extends over the entire width of the fleece. To start up, one of the two walls of the conical part 10 and the drafting shaft 19 is then folded away or pushed away.
  • the hyperbaric chamber is attached directly to the actual spinning system in a manner known per se.
  • the air supply 8 to the pressure chamber is arranged at a distance from the surface of the spinneret. The distance is chosen so large that the spinneret surface is no longer affected by the air blown in. For the same reason, a deflection of the flow in the thread running direction is also advantageous.
  • Such injection nozzles are state of the art and only have to be adapted to the special design of the spinning system for curtain spinning.
  • the opening angle a of the slightly tapered part 10 of the pressure chamber is chosen to be less than 7 ° in order to keep the air flow as steady as possible.
  • the subsequent drawing shaft 19 is used for drawing the filaments and, in order to transmit the required drawing forces there, usually has a length of more than 1 m.
  • the drafting shaft has a small width so that the free area per filament is approximately one square millimeter. In the nonwoven spinning system according to DE-OS 20 16 860, the free area in the channels is approximately 20 to 50 mm 2 .
  • a starting aid which, according to the invention, consists in that a longitudinal wall 12 of the drafting shaft 19 can be moved away. Depending on the spatial conditions, the longitudinal wall can be folded away or pushed sideways or lengthways. Special care must be taken to ensure that the closed shaft is properly sealed, since the thread curtain is sensitive to air swirls etc.
  • the overpressure in the chamber can be chosen to be much lower than the air pressure in an injector nozzle according to the prior art, for example according to the German laid-open specification 20 48 006. An overpressure of only 0.4 bar proved to be sufficient in the spinning installation shown in the example .
  • the small cross-sectional area of the thread curtain also requires only a small area of the filing belt that is extracted.
  • the air extracted there can be reused as stretching air after single or multi-stage compression.
  • the present invention thus combines the advantages of the spunbonded nonwoven system with a pressure chamber, i.e. the low air consumption and the good uniformity of the thread curtain over the width of the system with the advantages of spinning systems, which lead to a high orientation of the filaments through injector nozzles and drawing tubes.
  • FIG. 2 shows a section through the entire device for producing a spunbonded nonwoven.
  • the horizontal cross sections through the upper part 5 and the tapered part 10 of the pressure vessel and through the shaft 19 are each rectangles, the length of which depends on the width of the nonwoven web to be produced.
  • FIG. 3 shows an enlarged detail of FIG. 2, namely the transition from the tapering part of the pressure vessel to the shaft 19.
  • the starting position of the hydraulically movable shaft wall 12 is shown with dash-dotted lines.
  • a parallel displacement of part 12 from the closed position shown by solid lines by about 30 mm is sufficient for the threads to fall unimpeded onto the deposit belt 16 when spinning through the shaft 19 thus expanded.
  • a spunbonded nonwoven made of polyethylene terephthalate was produced using a device according to FIG.
  • the sliding wall 12 was moved 30 mm to the right. Only then were the spinning pumps switched on and the spun threads 9 fell easily onto the screen belt 16. The suction 18 and the running screen belt 16 ensured that the threads 9 were transported continuously. Only after the wall 12 had been closed did the pressure vessel reach a constant overpressure brought from 0.4 bar.
  • the air supplied at 8 was constantly regulated at 35 ° C and a dew point of 20 ° C.
  • the air speed immediately after the sintered metal bodies 7 was measured at 0.3 m / s.
  • the total area of the sintered metal body 7 was 0.6 m 2.
  • the width of the pressure vessel and the shaft (not shown in the drawing) was chosen to be 1.2 m so that the ends of the 104 cm wide thread curtain could not be impaired by edge effects of the flow in the shaft 19 . Threads with the following properties were thus spun:
  • the screen belt 16 had a speed of 76 m / min.
  • the suction 18 was set so that a vertical air flow of 4 m / s was generated in the storage area directly above the screen belt. Under these conditions an approximately 1 m wide fleece with a basis weight of 50 g / m 2 was obtained. Pre-consolidation was still achieved on the deposit belt by means of the heated roller 14 (190 ° C.) and the support roller 15. The uniformity of the nonwoven web produced was characterized by a coefficient of variation of the basis weight of 6% and was therefore very good. The diameter of the round measuring spot was 30 mm.

Abstract

Eine Vorrichtung zum Herstellen eines Spinnvlieses durch pneumatisches Abziehen und Ablegen schmelzgesponnener Filamente besteht aus einer mit der Schmelzspinndüse gasdicht verbundenen Überdruckkammer mit Austrittsöffnungen für die Filamente. Die Überdruckkammer verjüngt sich schwach konisch zu einem Verstreckschacht. Der Öffnungswinkel der schwach konischen Überdruckkammer liegt unter 7°. Die Fäden werden un Form eines linearen Fadenvorhanges in das Innere der Überdruckkammer gesponnen, welche ebenso breit ist wie der Vorhang. Eine Seite des konischen Teils und des Verstreckschachts ist bewegbar und kann beim Beginn des Schmelzspinnens von der anderen Wand weg bewegt werden, so daß das Anspinnen erleichtert wird.A device for producing a spunbonded web by pneumatically pulling off and depositing melt-spun filaments consists of an overpressure chamber which is connected in a gastight manner to the melt spinning nozzle and has outlet openings for the filaments. The pressure chamber tapers slightly conically to a drafting shaft. The opening angle of the weakly conical pressure chamber is less than 7 °. The threads are spun in the form of a linear thread curtain into the interior of the pressure chamber, which is as wide as the curtain. One side of the conical part and the drafting shaft is movable and can be moved away from the other wall at the start of melt spinning, so that piecing is facilitated.

Description

Die Erfindung betrifft eine Vorrichtung zum Herstellen eines Spinnvlieses durch pneumatisches Abziehen und Ablegen schmelzgesponnener Filamente, bestehend aus einer mit der Schmelzspinndüse gasdicht verbundenen Überdruckkammer mit Austrittsöffnungen für die Filamente.The invention relates to a device for producing a spunbonded web by pneumatic drawing and depositing of melt-spun filaments, consisting of an overpressure chamber with outlet openings for the filaments, which is connected in a gastight manner to the melt spinning nozzle.

Eine derartige Vorrichtung ist aus der britischen Patentschrift 10 82 224 bekannt. Dieses Patent weist auch darauf hin, daß sich diese Vorrichtung für das sogenannte Vorhangspinnen eignet. Diese Vorrichtung führt zu Filamenten hoher Dehnung, wie aus den Beispielen ersichtlich ist.Such a device is known from British Patent 10 82 224. This patent also indicates that this device is suitable for so-called curtain spinning. This device leads to high elongation filaments, as can be seen from the examples.

Eine ausführliche Diskussion derartiger Spinnanlagen mit einer überdruckkammer liefert die deutsche Offenlegungsschrift 20 16 860, in der die Austrittsöffnungen als Kanäle mit einer Länge von mindestens 20 mm, bevorzugt 50 - 300 mm Länge ausgebildet sind. - Durch diese Gestaltung ergibt sich eine verbesserte Kraftübertragung der strömenden Luft auf die Filamente und entsprechend eine verbesserte Orientierung der Filamente, wie z.B. aus Beispiel 10 dieser Offenlegungsschrift zu ersehen ist.A detailed discussion of such spinning systems with an overpressure chamber is provided in German Offenlegungsschrift 20 16 860, in which the outlet openings are designed as channels with a length of at least 20 mm, preferably 50-300 mm in length. - This design results in an improved power transmission of the flowing air to the filaments and accordingly an improved orientation of the filaments, such as can be seen from Example 10 of this published specification.

Der Durchmesser dieser Kanäle muß relativ groß gewählt werden, um den Anspinnvorgang zu ermöglichen, bei dem die frisch gesponnenen Filamente mit Hilfe von dünnen Drähten vom Austrittsende her durch die Austrittsöffnungen geleitet werden. Dieser Anspinnvorgang verbietet auch größere Kanallängen.The diameter of these channels must be chosen to be relatively large in order to enable the piecing process, in which the freshly spun filaments are guided through the outlet openings with the aid of thin wires from the outlet end. This piecing process also prohibits longer channel lengths.

Im Text der deutschen Offenlegungsschrift 20 16 860 wird auch ausgedrückt, daß sich diese Vorrichtung nur für kreisrunde Düsenlochanordnungen eignet, nicht aber für das sogenannte Vorhangspinnen.In the text of German published patent application 20 16 860 it is also expressed that this device is only suitable for circular nozzle hole arrangements, but not for so-called curtain spinning.

Aufgabe der vorliegenden Erfindung ist es deshalb, eine Vorrichtung zu liefern, die sich für das Vorhangspinnen, d.h. eine Reihenanordnung der Spinndüsenlöcher eignet und die den Anfahrvorgang erleichtert.The object of the present invention is therefore to provide a device which is suitable for curtain spinning, i.e. a row arrangement of the spinneret holes is suitable and facilitates the start-up process.

Die erfindungsgemäße Vorrichtung besteht aus einer an sich bekannten Überdruckkammer unterhalb der Reihenspinndüse, die sich dann schwach konisch zu einem Verstreckschacht 19 konstanter Weite verjüngt, der vorzugsweise eine Länge von über 1 m aufweist.The device according to the invention consists of a pressure chamber known per se below the row spinneret, which then tapers slightly conically to a drawing shaft 19 of constant width, which preferably has a length of more than 1 m.

Der Öffnungswinkel α des schwach konischen Teils 10 der Überdruckkammer liegt vorzugsweise unter 7°.The opening angle α of the weakly conical part 10 of the pressure chamber is preferably less than 7 °.

Die Luftzufuhr zur Überdruckkammer erfolgt besonders bevorzugt durch zwei gegenüber angeordnete waagrechte Reihen von Anblasdüsen, bestehend aus Sintermetallkörpern, nach denen die Luftströmung bevorzugt in Fadenlaufrichtung umgelenkt wird.The air supply to the overpressure chamber is particularly preferably carried out by two horizontally arranged rows of blowing nozzles, consisting of sintered metal bodies, by means of which the air flow is preferably deflected in the direction of the thread.

Der Verstreckschacht 19 mit konstanter.Weite enthält an seinem Austrittsende bevorzugt ein sich erweiterndes Endteil 13.The stretching shaft 19 with a constant width preferably contains an expanding end part 13 at its outlet end.

In einer bevorzugten Ausführungsform ist zumindest eine Seite des konischen Teils 10 der Druckkammer und des Verstreckschachtes 19 bewegbar.In a preferred embodiment, at least one side of the conical part 10 of the pressure chamber and the drafting shaft 19 is movable.

Die erfindungsgemäße Vorrichtung eignet sich besonders für -Vorhangspinnanlagen mit einer linearen Anordnung der Spinndüsenlöcher über die gesamte Vliesbreite, wie sie die DE-AS 20 48 006 beschreibt. Die erfindungsgemäße Vorrichtung erstreckt sich dann'ebenfalls über die gesamte Vliesbreite. Zum Anfahren wird dabei dann eine der beiden Wände des konischen Teils 10 und des Verstreckschachts 19 weggeklappt oder weggeschoben.The device according to the invention is particularly suitable for curtain spinning systems with a linear arrangement of the spinneret holes over the entire width of the fleece, as described in DE-AS 20 48 006. The device according to the invention then also extends over the entire width of the fleece. To start up, one of the two walls of the conical part 10 and the drafting shaft 19 is then folded away or pushed away.

Die überdruckkammer ist in an sich bekannter Weise direkt anschließend an der eigentlichen Spinnanlage befestigt. In einigem Abstand zur Spinndüsenoberfläche ist die Luftzufuhr 8 zur überdruckkammer angeordnet. Der Abstand wird so groß gewählt, daß die Spinndüsenoberfläche nicht mehr von der eingeblasenen Luft beeinträchtigt wird. Aus demselben Grund ist auch eine Umlenkung der Strömung in Fadenlaufrichtung vorteilhaft. Derartige Einblasdüsen sind Stand der Technik und müssen nur noch der speziellen Gestaltung der Spinnanlage beim Vorhangspinnen angepaßt werden.The hyperbaric chamber is attached directly to the actual spinning system in a manner known per se. The air supply 8 to the pressure chamber is arranged at a distance from the surface of the spinneret. The distance is chosen so large that the spinneret surface is no longer affected by the air blown in. For the same reason, a deflection of the flow in the thread running direction is also advantageous. Such injection nozzles are state of the art and only have to be adapted to the special design of the spinning system for curtain spinning.

Der öffnungswinkel a des leicht konisch zulaufenden Teils 10 der überdruckkammer wird unter 7° gewählt, um die Luftströmung möglichst ruhig zu halten.The opening angle a of the slightly tapered part 10 of the pressure chamber is chosen to be less than 7 ° in order to keep the air flow as steady as possible.

Der anschließende Verstreckschacht 19 dient zum Verstrecken der Filamente und hat, um dort die erforderlichen Verstreckkräfte zu übertragen, meistens eine Länge von mehr als 1 m. Der Verstreckschacht hat eine geringe Weite, so daß die freie Fläche pro Filament bei ca. einem Quadratmillimeter liegt. Bei der Vliesspinnanlage nach DE-OS 20 16 860 liegt die freie Fläche in den Kanälen bei etwa 20 bis 50 mm2.The subsequent drawing shaft 19 is used for drawing the filaments and, in order to transmit the required drawing forces there, usually has a length of more than 1 m. The drafting shaft has a small width so that the free area per filament is approximately one square millimeter. In the nonwoven spinning system according to DE-OS 20 16 860, the free area in the channels is approximately 20 to 50 mm 2 .

Diese engen Verstreckschächte 19 erfordern eine Anfahrhilfe, die erfindungsgemäß daraus besteht, daß eine Längswand 12 des Verstreckschachtes 19 wegbewegt werden kann. Je nach räumlichen Verhältnissen kann die Längswand weggeklappt oder quer oder längs weggeschoben werden. Hierbei muß besonders auf eine gute Abdichtung des geschlossenen Schachtes geachtet werden, da der Fadenvorhang empfindlich auf Luftwirbel etc. reagiert.These narrow drafting shafts 19 require a starting aid which, according to the invention, consists in that a longitudinal wall 12 of the drafting shaft 19 can be moved away. Depending on the spatial conditions, the longitudinal wall can be folded away or pushed sideways or lengthways. Special care must be taken to ensure that the closed shaft is properly sealed, since the thread curtain is sensitive to air swirls etc.

Durch diese Erleichterung kann ein langer Verstreckschacht 19 benutzt werden, der entsprechend hohe Orientierung der Filamente ergibt. Näherungsweise wächst die vom Luftstrom auf die Filamente übertragene Kraft mit der Wurzel aus der Länge des Verstreckschachts 19. Die Beispiele zeigen die Wirkung der Schachtlänge auf.As a result of this relief, a long drawing shaft 19 can be used, which results in a correspondingly high orientation of the filaments. Approximately, the force transferred from the air flow to the filaments increases with the root from the length of the drafting shaft 19. The examples show the effect of the shaft length.

Der Überdruck in der Kammer kann viel geringer gewählt werden als der Luftdruck in einer Injektordüse nach dem Stand der Technik, etwa nach der deutschen Offenlegungsschrift 20 48 006. Ein Überdruck von nur 0,4 bar erwies sich in der im Beispiel näher gezeigten Spinnanlage als ausreichend.The overpressure in the chamber can be chosen to be much lower than the air pressure in an injector nozzle according to the prior art, for example according to the German laid-open specification 20 48 006. An overpressure of only 0.4 bar proved to be sufficient in the spinning installation shown in the example .

Die geringe Querschnittsfläche des Fadenvorhangs erfordert entsprechend auch nur eine kleine abgesaugte Fläche des Ablagebandes. Die dort abgesaugte Luft kann nach ein- oder mehrstufiger Verdichtung wieder als Verstreckluft eingesetzt werden.The small cross-sectional area of the thread curtain also requires only a small area of the filing belt that is extracted. The air extracted there can be reused as stretching air after single or multi-stage compression.

Die vorliegende Erfindung verbindet also die Vorteile der Spinnvliesanlage mit Überdruckkammer, d.h. den geringen Luftverbrauch und die gute Gleichmäßigkeit des Fadenvorhangs über die Anlagebreite mit den Vorteilen von Spinnanlagen, die durch Injektordüsen und Verstreckrohre zu einer hohen Orientierung der Filamente führen.The present invention thus combines the advantages of the spunbonded nonwoven system with a pressure chamber, i.e. the low air consumption and the good uniformity of the thread curtain over the width of the system with the advantages of spinning systems, which lead to a high orientation of the filaments through injector nozzles and drawing tubes.

Die vorliegende Erfindung wird an Hand der Abbildungen und an einem bevorzugten Beispiel näher beschrieben:

  • In den Figuren bedeuten: 1 Pack, l'Düsenlöcher, 2 Spinnkessel, 3 gasdichte Abdeckung der öffnung zum Einbau des Packs 1, 4 Wärmeisolation, 5 Oberteil des Druckbehälters, 6 abwärts weisende Luftjalousien, 7 Sintermetallkörper, 8 Luftzufuhr, 9 Fäden, 10 sich verjüngender Teil des Druckbehälters, 11 feststehende Schachtwand, 12 verschiebbare Wand, 13 Aufweitung des Schachts, 14 beheizte Walze, 15 Unterstützungswalze, 16 Siebband, 17 vorverfestigtes Vlies, 18 Absaugung, L1 Länge des Oberteils des Druckbehälters, L2 Länge des sich verjüngenden Teils des Druckbehälters, L3 Länge des Schachts 19, L4 Schachtweite, 19 Schacht.
The present invention is described in more detail with reference to the figures and a preferred example:
  • In the figures: 1 pack, 1 nozzle holes, 2 spinning kettles, 3 gas-tight covering of the opening for installing the pack 1, 4 heat insulation, 5 upper part of the pressure vessel, 6 downward-facing air blinds, 7 sintered metal bodies, 8 air supply, 9 threads, 10 themselves tapering part of the pressure vessel, 11 fixed shaft wall, 12 sliding wall, 13 expansion of the shaft, 14 heated roller, 15 support roller, 16 screen belt, 17 pre-consolidated fleece, 18 suction, L 1 length of the top part of the pressure vessel, L 2 length of the tapering part of the pressure vessel, L 3 length of the shaft 19, L 4 shaft width, 19 shaft.

Die Figur 1 zeigt eine mögliche Anordnung der Spinndüsenlöcher l' in einem Rechteckpack 1. Diese Packs werden in der dargestellten Art und Weise versetzt in den Spinnkessel 2 eingebaut, um einen lückenlosen Vorhang von Spinnfäden zu erhalten.1 shows a possible arrangement of the spinneret holes 1 'in a rectangular pack 1. These packs are in the illustrated way installed in the spinning kettle 2 to get a complete curtain of spun threads.

Die Figur 2 zeigt einen Schnitt durch die gesamte Vorrichtung zum Herstellen eines Spinnvlieses. Die horizontalen Querschnitte durch das Oberteil 5 und das sich verjüngende Teil 10 des Druckbehälters sowie durch den Schacht 19 sind jeweils Rechtecke, deren Länge sich nach der Breite der herzustellenden Vliesbahn richtet.FIG. 2 shows a section through the entire device for producing a spunbonded nonwoven. The horizontal cross sections through the upper part 5 and the tapered part 10 of the pressure vessel and through the shaft 19 are each rectangles, the length of which depends on the width of the nonwoven web to be produced.

Die Figur 3 zeigt vergrößert ein Detail von Figur 2, nämlich den Übergang vom sich verjüngenden Teil des Druckbehälters zum Schacht 19. Mit strichpunktierten Linien ist die Anfahrposition der hydraulisch beweglichen Schachtwand 12 dargestellt. Eine Parallelverschiebung von Teil 12 aus der mit durchgezogenen Linien dargestellten geschlossenen Position um etwa 30 mm ist ausreichend dafür, daß die Fäden beim Anspinnen durch den so erweiterten Schacht 19 ungehindert bis auf das Ablageband 16 fallen.FIG. 3 shows an enlarged detail of FIG. 2, namely the transition from the tapering part of the pressure vessel to the shaft 19. The starting position of the hydraulically movable shaft wall 12 is shown with dash-dotted lines. A parallel displacement of part 12 from the closed position shown by solid lines by about 30 mm is sufficient for the threads to fall unimpeded onto the deposit belt 16 when spinning through the shaft 19 thus expanded.

Beispiel 1example 1

Mit einer Vorrichtung nach Figur 2 wurde ein Spinnvlies aus Polyethylenterephthalat hergestellt.A spunbonded nonwoven made of polyethylene terephthalate was produced using a device according to FIG.

Die Hauptabmessungen der Spinnanlage betrugen:

  • L1 = 500 mm; L2 = 1500 mm; L3 = 1500 mm;
  • lichte Weite des Druckbehälters 5 oben: 200 mm;
  • lichte Weite des Schachtausgangs L4 = 2 mm.
The main dimensions of the spinning system were:
  • L 1 = 500 mm; L 2 = 1500 mm; L 3 = 1500 mm;
  • clear width of the pressure vessel 5 above: 200 mm;
  • clear width of shaft exit L 4 = 2 mm.

Mit Hilfe von 4 Packs 1, wie sie in Figur 1 dargestellt sind, wurde ein 104 cm breiter Fadenvorhang gesponnen. Die Schmelzetemperatür betrug 295°C, die Viskosität der Schmelze: 220 Pas, jedes Pack 1 hatte 520 Spinndüsenlöcher 1' mit 0.5 mm Durchmesser. Der Gesamtdurchsatz der Anlage war 3.95 kg/min.With the help of 4 packs 1, as shown in Figure 1, a 104 cm wide thread curtain was spun. The melt temperature was 295 ° C, the viscosity of the melt: 220 Pas, each pack 1 had 520 spinneret holes 1 'with a 0.5 mm diameter. The total throughput of the plant was 3.95 kg / min.

Zum Anfahren der Anlage wurde die verschiebbare Wand 12 um 30 mm nach rechts verschoben. Erst danach wurden die Spinnpumpen eingeschaltet und die gesponnenen Fäden 9 fielen problemlos bis auf das Siebband 16. Die Absaugung 18 und das laufende Siebband 16 sorgten für einen stetigen Weitertransport der Fäden 9. Erst nach dem Schließen der Wand 12 wurde der Druckbehälter auf einen konstanten Überdruck von 0.4 bar gebracht.To start up the system, the sliding wall 12 was moved 30 mm to the right. Only then were the spinning pumps switched on and the spun threads 9 fell easily onto the screen belt 16. The suction 18 and the running screen belt 16 ensured that the threads 9 were transported continuously. Only after the wall 12 had been closed did the pressure vessel reach a constant overpressure brought from 0.4 bar.

Die bei 8 zugeführte Luft wurde konstant auf 35°C und einen Taupunkt von 20°C geregelt. Die Luftgeschwindigkeit unmittelbar nach den Sintermetallkörpern 7 wurde mit 0.3 m/s gemessen. Die Gesamtfläche der Sintermetallkörper 7 betrug 0.6 m2. Die Breite des Druckbehälters und des Schachtes (nicht zeichnerisch dargestellt) war zu 1,2 m gewählt worden, damit die Enden des 104 cm breiten Fadenvorhangs nicht durch Randeffekte der Strömung im Schacht 19 beeinträchtigt werden konnten. Damit wurden Fäden mit folgenden Eigenschaften ersponnen:The air supplied at 8 was constantly regulated at 35 ° C and a dew point of 20 ° C. The air speed immediately after the sintered metal bodies 7 was measured at 0.3 m / s. The total area of the sintered metal body 7 was 0.6 m 2. The width of the pressure vessel and the shaft (not shown in the drawing) was chosen to be 1.2 m so that the ends of the 104 cm wide thread curtain could not be impaired by edge effects of the flow in the shaft 19 . Threads with the following properties were thus spun:

Figure imgb0001
Zur Vliesbildung hatte das Siebband 16 eine Geschwindigkeit von 76 m/min. Die Absaugung 18 war so eingestellt, daß im Ablagebereich unmittelbar über dem Siebband eine vertikale Luftströmung von 4 m/s erzeugt wurde. Unter diesen Bedingungen wurde ein ca. 1 m breites Vlies mit einem Flächengewicht von 50 g/m2 erhalten. Eine Vorverfestigung wurde mittels der beheizten Walze 14 (190°C) und der Unterstützungswalze 15 noch auf dem Ablageband erreicht. Die Gleichmäßigkeit der hergestellten Vliesbahn war durch einen Variationskoeffizienten des Flächengewichtes von 6 % gekennzeichnet und damit sehr gut. Der Durchmesser des runden Meßflecks betrug dabei 30 mm.
Figure imgb0001
 The screen belt 16 had a speed of 76 m / min. The suction 18 was set so that a vertical air flow of 4 m / s was generated in the storage area directly above the screen belt. Under these conditions an approximately 1 m wide fleece with a basis weight of 50 g / m 2 was obtained. Pre-consolidation was still achieved on the deposit belt by means of the heated roller 14 (190 ° C.) and the support roller 15. The uniformity of the nonwoven web produced was characterized by a coefficient of variation of the basis weight of 6% and was therefore very good. The diameter of the round measuring spot was 30 mm.

2. Bei kürzeren Längen L3 des Schachtes 19 und sonst unverändertem Versuchsaufbau ergaben sich folgende Fadenwerte:

Figure imgb0002
2. With shorter lengths L3 of shaft 19 and otherwise unchanged test setup, the following thread values resulted:
Figure imgb0002

Diese Werte zeigen, daß bei dem angestrebten niedrigen Druck im Druckbehälter Schachtlängen von mehr als 1 m nötig sind, um ausreichende textile werte der Fäden zu erhalten.These values show that at the low pressure aimed for in the pressure vessel, shaft lengths of more than 1 m are necessary in order to obtain adequate textile values for the threads.

Claims (5)

1. Vorrichtung zum Herstellen eines Spinnvlieses durch pneumatisches Abziehen und Ablegen schmelzgesponnener Filamente, bestehend aus einer mit der Schmelzspinndüse gasdicht verbundenen Überdruckkammer mit Austrittsöffnungen für die Filamente, dadurch gekennzeichnet, daß die Überdruckkammer sich schwach konisch zu einem Verstreckschacht (19) verjüngt, die Luftzufuhr in die Überdruckkammer durch zwei gegenüberliegende Reihen von Luftzufuhrvorrichtungen (7,8) erfolgt, die in einigem Abstand von der Oberfläche der Spinndüsen angebracht sind, und die Umlenkung der Luftströmung in Fadenlaufrichtung durch Umlenkvorrichtungen (6) bewirkt wird.1. Device for producing a spunbonded web by pneumatic pulling and depositing of melt-spun filaments, consisting of a gas-tight pressure chamber connected to the melt spinneret with outlet openings for the filaments, characterized in that the pressure-chamber tapers slightly conically to a drafting shaft (19), the air supply in the pressure chamber is carried out by two opposite rows of air supply devices (7, 8), which are arranged at some distance from the surface of the spinnerets, and the deflection of the air flow in the direction of the thread is effected by deflection devices (6). 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Öffnungswinkel des schwach konischen Teils (10) der Überdruckkammer unter 7° liegt.2. Device according to claim 1, characterized in that the opening angle of the weakly conical part (10) of the pressure chamber is below 7 °. 3. Vorrichtung nach Ansprüchen 1 und 2, dadurch gekennzeichnet, daß die Fäden in Form eines sich über die volle Vliesbreite erstreckenden linearen Fadenvorhangs ins Innere dieser ebenso breiten Überdruckkammer gesponnen werden.3. Device according to claims 1 and 2, characterized in that the threads are spun in the form of a linear thread curtain extending over the full fleece width inside this equally wide pressure chamber. 4. Vorrichtung nach Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß der Verstreckschacht (19) an seinem Auslaßende ein leicht konisch geöffnetes Endteil (13) enthält.4. Device according to claims 1 to 3, characterized in that the stretching shaft (19) at its outlet end contains a slightly conically open end part (13). 5. Vorrichtung nach Ansprüchen 1 bis 4, dadurch gekennzeichnet, daß zumindest eine Seite des konischen Teils (10) und des Verstreckschachtes (19) bewegbar ist.5. Device according to claims 1 to 4, characterized in that at least one side of the conical part (10) and the drafting shaft (19) is movable.
EP85100268A 1984-01-19 1985-01-12 Apparatus for the manufacture of a spun-bonded fabric Withdrawn EP0150024A3 (en)

Applications Claiming Priority (2)

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DE3401639 1984-01-19
DE19843401639 DE3401639A1 (en) 1984-01-19 1984-01-19 DEVICE FOR PRODUCING A SPINNING FLEECE

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EP0150024A2 true EP0150024A2 (en) 1985-07-31
EP0150024A3 EP0150024A3 (en) 1989-04-26

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GB2200146A (en) * 1987-01-21 1988-07-27 Reifenhaeuser Masch Production of a spun fleece
GB2200145A (en) * 1987-01-21 1988-07-27 Reifenhaeuser Masch Production of a spun fleece
GB2200145B (en) * 1987-01-21 1990-11-21 Reifenhaeuser Masch Production of spun fleece
GB2200146B (en) * 1987-01-21 1990-11-21 Reifenhaeuser Masch Production of spun fleece
WO1991007530A2 (en) * 1989-11-08 1991-05-30 Fiberweb North America, Inc. Method and apparatus for providing uniformly distributed filaments from a spun filament bundle and spunbonded fabric obtained therefrom
WO1991007530A3 (en) * 1989-11-08 1991-06-27 Fiberweb North America Inc Method and apparatus for providing uniformly distributed filaments from a spun filament bundle and spunbonded fabric obtained therefrom
US5225018A (en) * 1989-11-08 1993-07-06 Fiberweb North America, Inc. Method and apparatus for providing uniformly distributed filaments from a spun filament bundle and spunbonded fabric obtained therefrom
US6355772B1 (en) 1992-10-02 2002-03-12 Cargill, Incorporated Melt-stable lactide polymer nonwoven fabric and process for manufacture thereof
EP0637641A1 (en) * 1993-08-02 1995-02-08 Fiberweb Sodoca Sarl Nonwoven containing an acid lactic polymer derivate, process of making and use thereof
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DE19924508C1 (en) * 1999-05-28 2000-11-30 Johns Manville Int Inc Direct melt spinning of nonwovens using aerodynamic drawing includes pressurized air chamber round spinneret that is accessible to operators
CN101027442B (en) * 2004-09-24 2010-06-16 阿尔比斯有限公司 Device for stacking synthetic fibres to form a nonwoven

Also Published As

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DE3401639A1 (en) 1985-07-25
JPS60155765A (en) 1985-08-15
US4627811A (en) 1986-12-09
EP0150024A3 (en) 1989-04-26

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