EP3209820B1 - Device and method for melt spinning and cooling a group of filaments - Google Patents

Device and method for melt spinning and cooling a group of filaments Download PDF

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Publication number
EP3209820B1
EP3209820B1 EP15784608.0A EP15784608A EP3209820B1 EP 3209820 B1 EP3209820 B1 EP 3209820B1 EP 15784608 A EP15784608 A EP 15784608A EP 3209820 B1 EP3209820 B1 EP 3209820B1
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EP
European Patent Office
Prior art keywords
air
cooling
filaments
spinning
cylinder
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EP15784608.0A
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German (de)
French (fr)
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EP3209820A1 (en
Inventor
Klaus Schäfer
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Oerlikon Textile GmbH and Co KG
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Oerlikon Textile GmbH and Co KG
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Publication of EP3209820A1 publication Critical patent/EP3209820A1/en
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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
    • D01D5/088—Cooling filaments, threads or the like, leaving the spinnerettes
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
    • D02J13/00—Heating or cooling the yarn, thread, cord, rope, or the like, not specific to any one of the processes provided for in this subclass
    • D02J13/001—Heating or cooling the yarn, thread, cord, rope, or the like, not specific to any one of the processes provided for in this subclass in a tube or vessel

Definitions

  • the invention relates to a device for melt spinning and cooling a filament bundle according to the preamble of claim 1, as well as an executable by means of such a device method according to the preamble of claim 9.
  • a plurality of fine strand-like filaments are extruded through nozzle bores of a spinneret.
  • the spinneret is fed a molten polymer under high pressure.
  • the plurality of strand-like filaments are combined in their entirety or in bundles.
  • Prior to combining the filaments are cooled by a cooling air flow, so that the molten state of the filaments after exiting the nozzle bore converts into a solidified state.
  • the uniformity of the cooling of all filaments is of great importance.
  • a cooling air flow generated radially inwardly by an air candle designed as a blow candle causes the cooling of the filament.
  • a blow candle which is a porous Outer cylinder has, so that over the entire circumference of the blow candle, a uniform flow of cooling air radially emerges and penetrates the filament curtain for cooling the filaments.
  • DE10109838A1 and WO2012097880A1 disclose a device for uniformly cooling a filament curtain by means of two concentric and perforated cylinders.
  • the filament curtain to be cooled is annular and located between the two cylinders.
  • the filament curtain is circular, and is inside the double cylinder.
  • DE202005007132U1 discloses an apparatus for melt-spinning and uniformly cooling a filament bundle with a spinner having a spinneret means for extruding filaments into a plurality of rectangular filament curtains, and having a cooling means disposed below the spinner apparatus comprising a double-walled and perforated blast box held between two filament curtains.
  • the DE202005007132U1 disclosed device ensures a homogeneous cooling and a constant product quality of all filaments of all filament curtains.
  • spinning systems can be retrofitted with this only 10-30 mm deep blow box, the space requirement of the device is not increased.
  • the device of claim 1 in addition to the filaments which run outside of an air candle in the form of a filament curtain, filaments are guided in the form of a filament bundle within the air candle.
  • filaments are guided in the form of a filament bundle within the air candle.
  • Both the inner circumference and the outer circumference of this air candle communicate with the filaments with respect to their cooling.
  • the inner circumference of this air candle in order to pressurize both the inside of the air candle and the outside of the air candle running filaments with cooling air, on the one hand the outer circumference and on the other hand, the inner circumference of this air candle as at least partially air-permeable jacket. Parts of the air candle are thus inter alia a perforated outer and a perforated inner cylinder.
  • This hollow cylindrical air candle requires a special Anornung the nozzle holes in the spinneret device.
  • the spinneret device consists of one or more melt distributors and one or several spinnerets. No nozzle bores are present in an annular region of the spinnerette device which adjoins the air candle. Furthermore, both within and outside of this annular region each have a nozzle bore zone in which a plurality of nozzle bores are arranged.
  • the ability to use one or more spinnerets offers the designer the chance to find the optimal design of the device with respect to other problems such as the tightness of the system.
  • the air candle has at least one connection, through which the cooling air is discharged to the air candle to, or out of the air candle out.
  • a separating cylinder is arranged in the interior of the air candle. This creates an outer channel adjacent to the outer cylinder and an inner channel adjacent to the inner cylinder.
  • this setting of different flow states is implemented by appropriate flow-influencing means.
  • the inner channel and the outer channel is assigned to each one, possibly adjustable throttle.
  • a single air connection for the air candle would suffice, but nevertheless different states can prevail or be set in the outer and inner channels.
  • These throttles may further fulfill a function of the flow rectification.
  • Fig. 1 a cross-sectional view of a first embodiment of the device according to the invention for carrying out the method according to the invention is shown.
  • the device consists of a spinning device 1 and a cooling device 11 arranged below the spinning device 1.
  • the spinning device 1 has on a lower side a spinneret device which consists of a melt distributor 4 and a spinneret 5.
  • This spinneret 5 is disposed on the underside of the spinneret assembly and has a plurality of nozzle bores 6. These nozzle bores 6 are arranged in two nozzle bore zones, with a first zone being formed by an outer ring of nozzle bores 6 and a second zone within the first zone is formed by a circular arrangement of nozzle bores 6.
  • the spinneret 5 is connected via the melt distributor 4 with a spinning pump 2.
  • the spinning pump 2 is connected via a melt feed 3 with a melt generator (not shown here), preferably connected to an extruder or a polycondensation.
  • the spinning pump 2, the melt distributor 4 and the spinneret 5 are heated.
  • spin bars are used, in which several spinnerets, e.g. are juxtaposed in a row.
  • the cooling device 11 below the spinning device 1 has an air filter 12 and the associated air channel 20.
  • the air candle 12 has a porous outer cylinder 13 and a porous inner cylinder 14 which may be made of, for example, a nonwoven fabric, a foam, a screen cloth or a sintered material.
  • the air candle 12 adjoins the spinneret 5.
  • the air candle 12 is held concentrically with the spinneret 5, so that the air candle 12 is enveloped by a filament curtain 9, and so that the air candle 12 encloses a filament bundle 10.
  • Filamentschar 7 consists of just this filament curtain 9 and this filament bundle 10, wherein in each case a nozzle bore zone for the extrusion of filament curtain 9 and filament bundle 10 in the spinneret 5 is present.
  • an air channel 20 is connected to the air candle 12.
  • This air duct 20 communicates with a fan 21.1 in connection, through which the air filter 12 either supplied cooling air, or through which cooling air is discharged from the air candle 12.
  • a molten polymer is fed via the spinning pump 2 under high pressure via the melt distributor 4 of the spinneret 5.
  • the polymer melt is forced through the formed on the bottom of a plurality of nozzle bores 6, so that a plurality of strand-like filaments 8 is formed.
  • the extruded filament bundle 7 forms an annular filament curtain 9 and a circular filament bundle 10, which are uniformly withdrawn from the spinneret 5 by a deduction not shown here.
  • a cooling medium is preferably a cooling air supplied via the air passage 20 of the air candle 12 and in the space inside the air candle 12, which is located between the outer cylinder 13 and the inner cylinder 14 forwarded. Now the cooling medium occurs evenly over the outer cylinder 13 of the air candle 12 to the outside and evenly over the inner cylinder 14 to the inside. At the inner and outer circumference of the air candle 12 creates a radial outlet flow, which leads a cooling air flow in the direction of the filament bundle 7. The cooling air flow penetrates into the filament bundle 7 and absorbs heat from filaments 8 of the filament bundle 7, so that the still liquid filaments 8 solidify gradually.
  • the cooling medium could also be removed from the air candle 12 by means of the blower 21.1.
  • ambient air is drawn in from the environment. This ambient air serves as cooling air by first penetrating the filament bundle 7, wherein the filaments 8 deliver their heat to the cooling air.
  • the cooling air flows via the outer cylinder 13 and the inner cylinder 14 into the air candle 12. About the air passage 20, the cooling air leaves the air candle 12 again.
  • the materials of the outer cylinder 13 and the inner cylinder 14 are coordinated so that optimum and preferably uniform cooling conditions for the filament curtain 9 and the filament bundle 10 arise.
  • two different nonwovens with different air resistances could be used for this purpose.
  • the two nozzle bore zones could also be formed by two different spinnerets 5. Even a single nozzle bore zone may consist of several spinnerets.
  • a plurality of circular spinnerets could be arranged to form a ring.
  • the nozzle bores 6, from which the filament bundle 10 is extruded, could also be distributed over several spinnerets.
  • one or more melt distributors 4 and one or more spinning pumps 2 could be used.
  • Fig. 2 is a schematic sectional view of the first exemplary embodiment Fig. 1 shown along the line AA.
  • the concentric arrangement of the regions of the filament bundle 7 and the air candle 12 can be seen particularly well.
  • the inner cylinder 14 of the air candle 12 is arranged.
  • Around the inner cylinder 14 around the outer cylinder 13 is arranged.
  • the cooling air is supplied or removed.
  • the filaments 8 of the filament curtain 9 are arranged annularly around the outer cylinder 13.
  • the cooling air flows, as indicated by the arrows, mainly radially through the Filamentschar 7.
  • the cooling air flows radially outward through the filament curtain 9 and radially inwardly through the filament bundle 10, in the direction of the filled arrowheads . If a negative pressure is applied to the air filter 12, the cooling air flows radially inward through the filament curtain 9 and radially outward through the filament bundle 10, in the direction of the dashed arrowheads.
  • Fig. 3 is a cross-sectional view of a second embodiment of the device according to the invention for carrying out the method according to the invention shown. Many elements are the same as the first Embodiment Fig. 1 , so here's just the changes.
  • a separating cylinder 15 is arranged here, so that an outer channel 16 assigned to the outer cylinder 13 and an inner channel 17 assigned to the inner cylinder 14 are formed.
  • an inner throttle 19 is arranged at the transition between air duct 20 and inner channel 17.
  • an outer throttle 18 is arranged at the transition between air duct 20 and outer channel 16.
  • the inner throttle 19 and the outer throttle 18 may be optionally adjustable with respect to their flow resistance. These two throttles can furthermore be designed such that they serve for the flow rectification.
  • the blower 21. 1 may serve either to supply cooling air to the air candle 12 or to remove cooling air from the air candle 12.
  • Fig. 4 is a schematic sectional view of the second embodiment Fig. 3 shown along the line AA.
  • the two embodiments differ only by the separation cylinder 15, which divides the space between the outer cylinder 13 and inner cylinder 14 in the outer channel 16 and the inner channel 17.
  • Fig. 5 shows a third embodiment of the device according to the invention. This is identical except for the differences described below builds up as the second embodiment Fig. 3 , The outer throttle 18 and the inner throttle 19 are missing in this embodiment.
  • the air duct 20 is divided by appropriate separating means.
  • the outer channel 16 is associated with a fan 21.1, the inner channel 17 another fan 21.2. Also in this way, the cooling air flows for the filament bundle 10 and the filament curtain 9 can be set separately from each other.
  • This version with two blowers offers many possibilities for cooling air flow.
  • both the inner channel 17 as well as the outer channel 16 are both subjected to pressure or both with negative pressure. Furthermore, a mutual control is possible.
  • the outer channel 16 is evacuated and the inner channel 17 are pressurized or vice versa.

Description

Die Erfindung betrifft eine Vorrichtung zum Schmelz spinnen und Kühlen einer Filamentschar gemäß dem Oberbegriff des Anspruchs 1, sowie ein mittels einer solchen Vorrichtung ausführbaren Verfahrens gemäß dem Oberbegriff des Anspruchs 9.The invention relates to a device for melt spinning and cooling a filament bundle according to the preamble of claim 1, as well as an executable by means of such a device method according to the preamble of claim 9.

Beim Schmelzspinnen von synthetischen Fasersträngen oder Fäden wird eine Vielzahl von feinen strangförmigen Filamenten durch Düsenbohrungen einer Spinndüse extrudiert. Hierzu wird der Spinndüse ein aufgeschmolzenes Polymer unter hohem Druck zugeführt. Zur Bildung eines Faserstranges oder mehrerer Fäden wird die Vielzahl der strangförmigen Filamente in ihrer Gesamtheit oder bündelweise zusammengefasst. Vor dem Zusammenfassen werden die Filamente durch einen Kühlluftstrom abgekühlt, so dass sich der schmelzeflüssige Zustand der Filamente nach dem Austritt aus der Düsenbohrung in einen verfestigten Zustand umwandelt. Für die Qualität des Faserstranges bzw. der Fäden ist die Gleichmäßigkeit der Abkühlung aller Filamente von großer Bedeutung. Zur Abkühlung einer sehr großen Anzahl von Filamenten werden bekannte Verfahren und Vorrichtungen eingesetzt, bei welchem die Vielzahl der Filamente durch eine Ringspinndüse zu einem ringförmigen Filamentvorhang extrudiert wird und bei welchem innerhalb des Filamentvorhangs ein radial von innen nach außen durch eine als Blaskerze ausgeführte Luftkerze erzeugter Kühlluftstrom die Abkühlung der Filamentschar bewirkt. Eine derartige Vorrichtung ist beispielsweise aus der EP1467005A1 bekannt. Der Kühlluftstrom zu Abkühlung der Filamentschar wird durch eine Blaskerze erzeugt, die einen porösen Außen-Zylinder aufweist, so dass über den gesamten Umfang der Blaskerze ein gleichmäßiger Kühlluftstrom radial austritt und den Filamentvorhang zur Kühlung der Filamente durchdringt.In melt-spinning synthetic fiber strands or yarns, a plurality of fine strand-like filaments are extruded through nozzle bores of a spinneret. For this purpose, the spinneret is fed a molten polymer under high pressure. To form a fiber strand or a plurality of threads, the plurality of strand-like filaments are combined in their entirety or in bundles. Prior to combining the filaments are cooled by a cooling air flow, so that the molten state of the filaments after exiting the nozzle bore converts into a solidified state. For the quality of the fiber strand or threads, the uniformity of the cooling of all filaments is of great importance. For cooling a very large number of filaments, known methods and devices are used, in which the plurality of filaments is extruded through a ring spinneret into an annular filament curtain and wherein within the filament curtain, a cooling air flow generated radially inwardly by an air candle designed as a blow candle causes the cooling of the filament. Such a device is for example from the EP1467005A1 known. The cooling air flow to cool the filament bundle is generated by a blow candle, which is a porous Outer cylinder has, so that over the entire circumference of the blow candle, a uniform flow of cooling air radially emerges and penetrates the filament curtain for cooling the filaments.

DE10109838A1 und WO2012097880A1 offenbaren eine Vorrichtung zur gleichmäßigen Kühlung eines Filamentvorhangs mittels zweier konzentrischer und perforierter Zylinder. In DE10109838A1 ist der zu kühlende Filamentvorhang ringförmig und befindet sich zwischen den beiden Zylindern. In WO2012097880A1 ist der Filamentvorhang kreisförmig, und befindet sich innerhalb des Doppelzylinders. DE10109838A1 and WO2012097880A1 disclose a device for uniformly cooling a filament curtain by means of two concentric and perforated cylinders. In DE10109838A1 the filament curtain to be cooled is annular and located between the two cylinders. In WO2012097880A1 the filament curtain is circular, and is inside the double cylinder.

DE202005007132U1 offenbart eine Vorrichtung zum Schmelzspinnen und zum gleichmäßigen Kühlen einer Filamentschar mit einer Spinneinrichtung, welche eine Spinndüseneinrichtung zum Extrudieren von Filamenten zu mehreren rechteckigen Filamentvorhängen aufweist, und mit einer unterhalb der Spinneinrichtung angeordneten Kühleinrichtung, welche einen zwischen zwei Filamentvorhängen gehaltenen doppelwandigen und perforierten Blaskasten aufweist. Die in DE202005007132U1 offenbarte Vorrichtung gewährleistet eine homogene Kühlung und eine konstante Produktqualität aller Filamente aller Filamentvorhänge. Ferner können Spinnanlagen mit diesem nur 10-30 mm tiefen Blaskasten nachgerüstet werden, wobei der Platzbedarf der Vorrichtung nicht vergrößert wird. DE202005007132U1 discloses an apparatus for melt-spinning and uniformly cooling a filament bundle with a spinner having a spinneret means for extruding filaments into a plurality of rectangular filament curtains, and having a cooling means disposed below the spinner apparatus comprising a double-walled and perforated blast box held between two filament curtains. In the DE202005007132U1 disclosed device ensures a homogeneous cooling and a constant product quality of all filaments of all filament curtains. Furthermore, spinning systems can be retrofitted with this only 10-30 mm deep blow box, the space requirement of the device is not increased.

Um den Tendenzen zu höheren Produktionsgeschwindigkeiten und größeren Produktionsleistungen folgen zu können, werden große Anzahlen von Filamenten mittels Spinndüsen extrudiert, die über eine sehr hohe Anzahl und Dichte von Düsenbohrungen verfügen, so dass die Filamentschar mit relativ hoher Dichte in dem Filamentvorhang geführt sind. In derartigen Fällen wird bei dem bekannten Verfahren und der bekannten Vorrichtung der Kühlluftstrom beim Durchtreten durch den Filamentvorhang von innen nach außen erwärmt. Dieser Effekt führt dazu, dass die äußeren Filamente des Filamentvorhanges nicht in dem Maße abgekühlt werden, wie die inneren Filamente des Filamentvorhangs. Diese Unterschiede in der Abkühlung wirken sich jedoch sehr nachteilig auf die Qualität des Faserstranges oder der Fäden aus. Neben einer gleichmäßigen Abkühlung der Filamente bei hohen Produktionsleistungen wird auch der Platzbedarf der gesamten Anlage immer wichtiger. Je größer der Platzbedarf ist, umso mehr Mittel müssen für die Produktionshalle bereitgestellt werden. In der EP1467005A1 ist zusätzlich zur Kühlung des Filamentvorhangs von innen eine weitere Kühlung von außen vorgesehen, um für eine große Filamentanzahl eine gleichmäßige Kühlung zu erreichen. Diese zusätzliche Kühleinrichtung vergrößert aber den Platzbedarf pro Spinndüse, und somit auch den Platzbedarf der kompletten Anlage.In order to be able to follow the trend towards higher production speeds and larger production capacities, large numbers of filaments are extruded by means of spinnerets which have a very high number and density of nozzle bores, so that the filament bundle is guided with relatively high density in the filament curtain. In such cases, in the known method and apparatus, the cooling air flow is heated from the inside to the outside as it passes through the filament curtain. This effect causes the outer filaments of the filament curtain to not be cooled as much as the inner filaments of the filament curtain. However, these differences in cooling have a very adverse effect on the quality of the fiber strand or filaments. In addition to a uniform cooling of the filaments at high production rates, the space requirement of the entire system is becoming increasingly important. The larger the space required, the more funds must be made available for the production hall. In the EP1467005A1 In addition to the cooling of the filament curtain from the inside a further cooling from the outside is provided to a uniform for a large number of filaments To achieve cooling. However, this additional cooling device increases the space required per spinneret, and thus the space requirement of the entire system.

Es ist somit Aufgabe der Erfindung, eine gattungsgemäße Vorrichtung und ein zugehöriges Verfahren bereitzustellen mit welcher möglichst viele Filamente auf kleinstem Raum ausgesponnen werden können, wobei trotzdem alle Filamente gleichmäßig abgekühlt werden.It is therefore an object of the invention to provide a generic device and an associated method with which as many Filaments can be spun in a small space, while still all filaments are cooled uniformly.

Diese Aufgabe wird erfindungsgemäß durch die Vorrichtung des Anspruchs 1 gelöst, indem zusätzlich zu den Filamenten, welche außerhalb einer Luftkerze in Form eines Filamentvorhangs laufen, innerhalb der Luftkerze Filamente in Form eines Filamentbündels geführt werden. So ergibt sich eine hohlzylindrisch ausgebildete Luftkerze. Sowohl der innere Umfang wie auch der äußere Umfang dieser Luftkerze stehen mit den Filamenten in Bezug zu deren Kühlung in Verbindung. Um sowohl die innerhalb der Luftkerze wie auch die außerhalb der Luftkerze laufenden Filamente mit Kühlluft zu beaufschlagen, ist zum einen der Außenumfang und zum anderen der Innenumfang dieser Luftkerze als zumindest teilweise luftdurchlässiger Mantel ausgebildet. Teile der Luftkerze sind somit unter anderem ein perforierter Außen- und ein perforierter Innen-Zylinder. Dabei spielt keine Rolle, ob mittels der Luftkerze die Kühlluft angesaugt oder ausgeblasen wird. Mittels dieser Vorrichtung wird ein hauptsächlich radial zu den Filamenten strömender Kühlluftstrom erzeugt, an welchen alle Filamente gleichmäßig ihre thermische Energie abgeben können. Durch die zusätzlichen Filamente, welche innerhalb der Luftkerze verlaufen, können mehr Filamente auf kleinerem Raum ausgesponnen werden. Bei gleicher Produktionsleistung sinkt der Platzbedarf der gesamten Anlage, so dass die Kosten für die Bereitstellung einer Fabrikhalle sinken. Ebenso sinken die Kosten für den Stahlbau der Anlage und die Kosten für die elektrischen und fluidtechnischen Leitungssysteme.This object is achieved by the device of claim 1, in addition to the filaments which run outside of an air candle in the form of a filament curtain, filaments are guided in the form of a filament bundle within the air candle. This results in a hollow cylindrical air candle. Both the inner circumference and the outer circumference of this air candle communicate with the filaments with respect to their cooling. In order to pressurize both the inside of the air candle and the outside of the air candle running filaments with cooling air, on the one hand the outer circumference and on the other hand, the inner circumference of this air candle as at least partially air-permeable jacket. Parts of the air candle are thus inter alia a perforated outer and a perforated inner cylinder. It does not matter whether the cooling air is sucked in or blown out by means of the air candle. By means of this device, a cooling air flow, which flows mainly radially to the filaments, is generated, at which all filaments can emit their thermal energy uniformly. Due to the additional filaments that run inside the air candle, more filaments can be spun in a smaller space. With the same production capacity, the space requirement of the entire system decreases, so that the costs for the provision of a factory floor sink. Likewise, the costs for the steel construction of the plant and the costs for the electrical and fluidic pipe systems are reduced.

Diese hohlzylindrische Luftkerze erfordert eine spezielle Anornung der Düsenbohrungen in der Spinndüseneinrichtung. Die Spinndüseneinrichtung besteht aus einem oder mehreren Schmelzeverteilern und aus einer oder mehreren Spinndüsen. In einem ringförmigen Bereich der Spinndüseneinrichtung, welcher an die Luftkerze angrenzt, sind keine Düsenbohrungen vorhanden. Des Weiteren existiert sowohl innerhalb wie auch außerhalb dieses ringförmigen Bereiches jeweils eine Düsenbohrungszone, in welcher mehrere Düsenbohrungen angeordnet sind. Im Gegensatz zu herkömmlichen Spinndüseneinrichtungen, welche lediglich außerhalb einer Luftkerze Düsenbohrungen aufweisen, ist es möglich mittels der hier vorgeschlagen Anordnung der Düsenbohrungen wesentlich mehr Bohrungen auf gleichem Raum zu platzieren, immer unter der Voraussetzung eine ausreichende Abkühlung erreichen zu können. Die Möglichkeit eine oder mehrere Spinndüsen zu verwenden bietet dem Konstrukteur die Chance die optimale Ausbildung der Vorrichtung in Bezug auf weitere Probleme wie z.B. der Dichtigkeit des Systems zu finden.This hollow cylindrical air candle requires a special Anornung the nozzle holes in the spinneret device. The spinneret device consists of one or more melt distributors and one or several spinnerets. No nozzle bores are present in an annular region of the spinnerette device which adjoins the air candle. Furthermore, both within and outside of this annular region each have a nozzle bore zone in which a plurality of nozzle bores are arranged. In contrast to conventional spinnerets, which have nozzle bores only outside of an air filter, it is possible to place much more holes in the same space by means of the arrangement of the nozzle bores proposed here, always to be able to achieve sufficient cooling under the condition. The ability to use one or more spinnerets offers the designer the chance to find the optimal design of the device with respect to other problems such as the tightness of the system.

Trotz der unterschiedlichen Art und Weise der Führung der Filamente sollen alle Filamente möglichst gleichmäßig abgekühlt werden. Dazu ist es im Allgemeinen notwendig, dass der Außen-Zylinder und der Innen-Zylinder unterschiedliche Luftwiderstände aufweisen. Diese Luftwiderstände der beiden Zylinder sind dabei so aufeinander abgestimmt, dass eben diese gleichmäßige Kühlung erreicht wird.Despite the different way of guiding the filaments all filaments should be cooled as evenly as possible. For this purpose, it is generally necessary that the outer cylinder and the inner cylinder have different air resistances. These air resistances of the two cylinders are coordinated so that just this uniform cooling is achieved.

Die Luftkerze weist zumindest einen Anschluss auf, durch welchen die Kühlluft zur Luftkerze zu, oder aus der Luftkerze heraus abgeführt wird.The air candle has at least one connection, through which the cooling air is discharged to the air candle to, or out of the air candle out.

In einer besonders bevorzugten Ausführungsform der Erfindung ist im inneren der Luftkerze ein Trennzylinder angeordnet. So entstehen ein Außen-Kanal angrenzend an den Außen-Zylinder und ein Innen-Kanal angrenzend an den Innen-Zylinder. Durch diese Trennung wird die gleichmäßige Kühlung von Filamentvorhang und Filamentbündel erleichtert, weil sich die Kühlluft des Filamentvorhangs und die des Filamentbündels in der Luftkerze nicht vermischen.In a particularly preferred embodiment of the invention, a separating cylinder is arranged in the interior of the air candle. This creates an outer channel adjacent to the outer cylinder and an inner channel adjacent to the inner cylinder. By this separation, the uniform cooling facilitated by filament curtain and filament bundles, because the cooling air of the filament curtain and the filament bundle in the air candle do not mix.

Durch diese Trennung innerhalb der Luftkerze wird eine getrennte Beeinflussung der Strömung im Außen-Kanal und im Innen-Kanal möglich. In einer weiteren Ausgestaltung der Erfindung ist dazu jedem Kanal zumindest ein Luftanschluss zugeordnet. So kann in jedem Kanal ein anderer Strömungszustand eingestellt werden.This separation within the air candle makes it possible to influence the flow separately in the outer channel and in the inner channel. In a further embodiment of the invention, at least one air connection is assigned to each channel. Thus, a different flow state can be set in each channel.

In einer alternativen Ausführungsform wird diese Einstellung unterschiedlicher Strömungszustände durch entsprechende Mittel zur Strömungsbeeinflussung umgesetzt. Dem Innen-Kanal und dem Außen-Kanal ist dazu jeweils eine, unter Umständen einstellbare Drossel zugeordnet. In diesem Fall würde ein einzelner Luftanschluss für die Luftkerze ausreichen, wobei trotzdem unterschiedliche Zustände im Außen- und im Innen-Kanal herrschen bzw. eingestellt werden können. Diese Drosseln können des Weiteren eine Funktion der Strömungsgleichrichtung erfüllen.In an alternative embodiment, this setting of different flow states is implemented by appropriate flow-influencing means. The inner channel and the outer channel is assigned to each one, possibly adjustable throttle. In this case, a single air connection for the air candle would suffice, but nevertheless different states can prevail or be set in the outer and inner channels. These throttles may further fulfill a function of the flow rectification.

Mittels der oben dargestellten Vorrichtungsmerkmale ist es möglich ein Verfahren auszuführen, mittels welchem alle Filamente, welche aus einer Spinndüseneinrichtung ausgesponnen werden, gleichmäßig abgekühlt werden. Dabei sind in der Spinndüseneinrichtung besonders viele Düsenbohrungen auf kleinstem Raum angeordnet. Die gleichmäßige Abkühlung zeigt sich z.B. in einem Stapelfaserprozess dadurch, dass alle erzeugten Stapelfasern bezüglich ihrer Eigenschaften in den gewünschten Toleranzbereichen liegen.By means of the above-described device features, it is possible to carry out a method by which all filaments spun out of a spinneret device are uniformly cooled. In this case, a particularly large number of nozzle bores are arranged in the smallest possible space in the spinneret device. The uniform cooling manifests itself, for example, in a staple fiber process in that all the staple fibers produced are in the desired tolerance ranges with regard to their properties.

Die erfindungsgemäße Vorrichtung und das erfindungsgemäße Verfahren werden nachfolgend anhand einiger Ausführungsbeispiele der erfindungsgemäßen Vorrichtung unter Bezug auf die beigefügten Figuren näher erläutert.The device according to the invention and the method according to the invention will be explained in more detail below with reference to some embodiments of the device according to the invention with reference to the attached figures.

Es stellen dar:

Fig. 1
schematisch eine Querschnittsansicht eines ersten Ausführungsbeispiels der erfindungsgemäßen Vorrichtung
Fig. 2
schematisch eine Schnittansicht des ersten Ausführungsbeispiels der erfindungsgemäßen Vorrichtung entlang der Linie A-A
Fig. 3
schematisch eine Querschnittsansicht eines zweiten Ausführungsbeispiels der erfindungsgemäßen Vorrichtung
Fig. 4
schematisch eine Schnittansicht des zweiten Ausführungsbeispiels der erfindungsgemäßen Vorrichtung entlang der Linie A-A
Fig. 5
schematisch eine Querschnittsansicht eines dritten Ausführungsbeispiels der erfindungsgemäßen Vorrichtung
They show:
Fig. 1
schematically a cross-sectional view of a first embodiment of the device according to the invention
Fig. 2
schematically a sectional view of the first embodiment of the device according to the invention along the line AA
Fig. 3
schematically a cross-sectional view of a second embodiment of the device according to the invention
Fig. 4
schematically a sectional view of the second embodiment of the device according to the invention along the line AA
Fig. 5
schematically a cross-sectional view of a third embodiment of the device according to the invention

Es werden in allen Figuren die gleichen Bezugszeichen verwendet. In Fig. 1 ist eine Querschnittsansicht eines ersten Ausführungsbeispiels der erfindungsgemäßen Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens dargestellt.The same reference numerals are used in all figures. In Fig. 1 a cross-sectional view of a first embodiment of the device according to the invention for carrying out the method according to the invention is shown.

Die Vorrichtung besteht aus einer Spinneinrichtung 1 und einer unterhalb der Spinneinrichtung 1 angeordneten Kühleinrichtung 11. Die Spinneinrichtung 1 weist an einer Unterseite eine Spinndüseneinrichtung auf, welche aus einem Schmelzeverteiler 4 und einer Spinndüse 5 besteht. Diese Spinndüse 5 ist an der Unterseite der Spinndüseneinrichtung angeordnet und verfügt über eine Vielzahl von Düsenbohrungen 6. Diese Düsenbohrungen 6 sind in zwei Düsenbohrungszonen angeordnet, wobei eine erste Zone durch einen außen angeordneten Ring von Düsenbohrungen 6 gebildet wird und eine zweite Zone innerhalb der ersten Zone durch eine kreisförmige Anordnung von Düsenbohrungen 6 gebildet wird. Die Spinndüse 5 ist über den Schmelzeverteiler 4 mit einer Spinnpumpe 2 verbunden. Die Spinnpumpe 2 ist über eine Schmelzezufuhr 3 mit einem Schmelzeerzeuger (hier nicht dargestellt), vorzugsweise mit einem Extruder oder einer Polykondensation verbunden. Die Spinnpumpe 2, der Schmelzeverteiler 4 und die Spinndüse 5 sind beheizt. Hierzu werden in der Regel so genannte Spinnbalken eingesetzt, an denen mehrere Spinndüsen z.B. in einer Reihe nebeneinander gehalten sind.The device consists of a spinning device 1 and a cooling device 11 arranged below the spinning device 1. The spinning device 1 has on a lower side a spinneret device which consists of a melt distributor 4 and a spinneret 5. This spinneret 5 is disposed on the underside of the spinneret assembly and has a plurality of nozzle bores 6. These nozzle bores 6 are arranged in two nozzle bore zones, with a first zone being formed by an outer ring of nozzle bores 6 and a second zone within the first zone is formed by a circular arrangement of nozzle bores 6. The spinneret 5 is connected via the melt distributor 4 with a spinning pump 2. The spinning pump 2 is connected via a melt feed 3 with a melt generator (not shown here), preferably connected to an extruder or a polycondensation. The spinning pump 2, the melt distributor 4 and the spinneret 5 are heated. For this purpose, usually so-called spin bars are used, in which several spinnerets, e.g. are juxtaposed in a row.

Die Kühleinrichtung 11 unterhalb der Spinneinrichtung 1 weist eine Luftkerze 12 und den dazu zugehörigen Luftkanal 20 auf. Die Luftkerze 12 besitzt einen porösen Außen-Zylinder 13 und einen porösen Innen-Zylinder 14, welche beispielsweise aus einem Vlies, Schaumstoff, Siebgewebe oder einem Sintermaterial hergestellt sein können.The cooling device 11 below the spinning device 1 has an air filter 12 and the associated air channel 20. The air candle 12 has a porous outer cylinder 13 and a porous inner cylinder 14 which may be made of, for example, a nonwoven fabric, a foam, a screen cloth or a sintered material.

Am freien Ende grenzt die Luftkerze 12 an die Spinndüse 5 an. Die Luftkerze 12 ist konzentrisch zu der Spinndüse 5 gehalten, so dass die Luftkerze 12 von einen Filamentvorhang 9 umhüllt ist, und so dass die Luftkerze 12 ein Filamentbündel 10 umschließt. Eine aus der Spinndüse 5 extrudierte Filamentschar 7 besteht aus eben diesem Filamentvorhang 9 und diesem Filamentbündel 10, wobei jeweils eine Düsenbohrungszone zur Extrusion von Filamentvorhang 9 und Filamentbündel 10 in der Spinndüse 5 vorhanden ist.At the free end, the air candle 12 adjoins the spinneret 5. The air candle 12 is held concentrically with the spinneret 5, so that the air candle 12 is enveloped by a filament curtain 9, and so that the air candle 12 encloses a filament bundle 10. One extruded from the spinneret 5 Filamentschar 7 consists of just this filament curtain 9 and this filament bundle 10, wherein in each case a nozzle bore zone for the extrusion of filament curtain 9 and filament bundle 10 in the spinneret 5 is present.

Zur Kühlluftversorgung der Luftkerze 12 ist ein Luftkanal 20 an die Luftkerze 12 angeschlossen. Dieser Luftkanal 20 steht mit einem Gebläse 21.1 in Verbindung, durch welches der Luftkerze 12 entweder Kühlluft zugeführt, oder durch welches Kühlluft aus der Luftkerze 12 abgeführt wird.For cooling air supply of the air candle 12, an air channel 20 is connected to the air candle 12. This air duct 20 communicates with a fan 21.1 in connection, through which the air filter 12 either supplied cooling air, or through which cooling air is discharged from the air candle 12.

Im Betriebszustand wird ein aufgeschmolzenes Polymer über die Spinnpumpe 2 unter hohem Druck über den Schmelzeverteiler 4 der Spinndüse 5 zugeführt. Innerhalb der Spinndüse 5 wird die Polymerschmelze durch die auf der Unterseite ausgebildete Vielzahl von Düsenbohrungen 6 gedrückt, so dass eine Vielzahl von strangförmigen Filamenten 8 entsteht. Die extrudierte Filamentschar 7 bildet einen ringförmigen Filamentvorhang 9 und ein kreisförmiges Filamentbündel 10, welche gleichmäßig von der Spinndüse 5 durch ein hier nicht dargestelltes Abzugswerk abgezogen werden.In the operating state, a molten polymer is fed via the spinning pump 2 under high pressure via the melt distributor 4 of the spinneret 5. Within the spinneret 5, the polymer melt is forced through the formed on the bottom of a plurality of nozzle bores 6, so that a plurality of strand-like filaments 8 is formed. The extruded filament bundle 7 forms an annular filament curtain 9 and a circular filament bundle 10, which are uniformly withdrawn from the spinneret 5 by a deduction not shown here.

Zur Abkühlung der frisch extrudierten Filamentschar 7 wird ein Kühlmedium vorzugsweise eine Kühlluft über den Luftkanal 20 der Luftkerze 12 zugeführt und in den Raum innerhalb der Luftkerze 12, welcher sich zwischen dem Außen-Zylinder 13 und dem Innen-Zylinder 14 befindet weitergeleitet. Nun tritt das Kühlmedium gleichmäßig über den Außen-Zylinder 13 der Luftkerze 12 nach außen und gleichmäßig über den Innen-Zylinder 14 nach innen aus. Am inneren und am äußeren Umfang Luftkerze 12 entsteht eine radiale Austrittsströmung, die einen Kühlluftstrom in Richtung der Filamentschar 7 führt. Der Kühlluftstrom dringt in die Filamentschar 7 ein und nimmt dabei Wärme von Filamenten 8 der Filamentschar 7 auf, so dass sich die noch flüssigen Filamente 8 allmählich verfestigen.To cool the freshly extruded Filamentschar 7, a cooling medium is preferably a cooling air supplied via the air passage 20 of the air candle 12 and in the space inside the air candle 12, which is located between the outer cylinder 13 and the inner cylinder 14 forwarded. Now the cooling medium occurs evenly over the outer cylinder 13 of the air candle 12 to the outside and evenly over the inner cylinder 14 to the inside. At the inner and outer circumference of the air candle 12 creates a radial outlet flow, which leads a cooling air flow in the direction of the filament bundle 7. The cooling air flow penetrates into the filament bundle 7 and absorbs heat from filaments 8 of the filament bundle 7, so that the still liquid filaments 8 solidify gradually.

Alternativ könnte das Kühlmedium mittels des Gebläses 21.1 auch aus der Luftkerze 12 abgeführt werden. In diesem Fall wird Umgebungsluft aus der Umgebung angesaugt. Diese Umgebungsluft dient als Kühlluft indem sie zunächst die Filamentschar 7 durchdringt, wobei die Filamente 8 ihre Wärme an die Kühlluft abgeben. Im Folgenden strömt die Kühlluft über den Außen-Zylinder 13 und den Innen-Zylinder 14 in die Luftkerze 12 ein. Über den Luftkanal 20 verlässt die Kühlluft die Luftkerze 12 wieder.Alternatively, the cooling medium could also be removed from the air candle 12 by means of the blower 21.1. In this case, ambient air is drawn in from the environment. This ambient air serves as cooling air by first penetrating the filament bundle 7, wherein the filaments 8 deliver their heat to the cooling air. In the following, the cooling air flows via the outer cylinder 13 and the inner cylinder 14 into the air candle 12. About the air passage 20, the cooling air leaves the air candle 12 again.

Die Materialien des Außen-Zylinder 13 und des Innen-Zylinder 14 werden so aufeinander abgestimmt, dass optimale und vorzugsweise gleichmäßige Abkühlbedingungen für den Filamentvorhang 9 und das Filamentbündel 10 entstehen. Dazu könnten zum Beispiel zwei unterschiedliche Vliese mit unterschiedlichen Luftwiderständen verwendet werden.The materials of the outer cylinder 13 and the inner cylinder 14 are coordinated so that optimum and preferably uniform cooling conditions for the filament curtain 9 and the filament bundle 10 arise. For example, two different nonwovens with different air resistances could be used for this purpose.

Die hier dargestellte konstruktive Ausführung der Spinndüse ist lediglich beispielhaft. So könnten die beiden Düsenbohrungszonen ebenfalls durch zwei unterschiedliche Spinndüsen 5 gebildet werden. Auch eine einzelne Düsenbohrungszone kann aus mehreren Spinndüsen bestehen. Zur Extrusion der Kunststoffschmelze zu einem äußeren Filamentvorhang 9 könnten beispielsweise mehrere kreisförmige Spinndüsen zu einem Ring angeordnet seien. Auch die Düsenbohrungen 6 aus welchen das Filamentbündel 10 extrudiert wird, könnten sich auf mehrere Spinndüsen verteilen.The structural design of the spinneret shown here is merely exemplary. Thus, the two nozzle bore zones could also be formed by two different spinnerets 5. Even a single nozzle bore zone may consist of several spinnerets. For extrusion of the plastic melt to an outer filament curtain 9, for example, a plurality of circular spinnerets could be arranged to form a ring. The nozzle bores 6, from which the filament bundle 10 is extruded, could also be distributed over several spinnerets.

Zur Versorgung der einen oder mehrerer Spinndüsen 5 könnten des Weiteren ein oder mehrere Schmelzeverteiler 4 und ein oder mehrere Spinnpumpen 2 verwendet werden.For supplying the one or more spinnerets 5, one or more melt distributors 4 and one or more spinning pumps 2 could be used.

In Fig. 2 ist schematisch eine Schnittansicht des ersten Ausführungsbeipiels aus Fig. 1 entlang der Linie A-A dargestellt.In Fig. 2 is a schematic sectional view of the first exemplary embodiment Fig. 1 shown along the line AA.

Hier ist besonders gut die konzentrische Anordnung der Bereiche der Filamentschar 7 und der Luftkerze 12 zu erkennen. Um das Filamentbündel 10 ist der Innen-Zylinder 14 der Luftkerze 12 angeordnet. Um den Innen-Zylinder 14 herum ist der Außen-Zylinder 13 angeordnet. In dem Raum zwischen diesen beiden Zylindern wird die Kühlluft zu- oder abgeführt. Um den Außen-Zylinder 13 sind ringförmig die Filamente 8 des Filamentvorhangs 9 angeordnet. Die Kühlluft strömt, wie durch die Pfeile angedeutet, hauptsächlich radial durch die Filamentschar 7. Herrscht in der Luftkerze 12 ein Überdruck, so strömt die Kühlluft radial nach außen durch den Filamentvorhang 9 und radial nach innen durch das Filamentbündel 10, in Richtung der ausgefüllten Pfeilspitzen. Wird an die Luftkerze 12 ein Unterdruck angelegt, so strömt die Kühlluft radial nach innen durch den Filamentvorhang 9 und radial nach außen durch das Filamentbündel 10, in Richtung der gestrichelten Pfeilspitzen.Here, the concentric arrangement of the regions of the filament bundle 7 and the air candle 12 can be seen particularly well. To the filament bundle 10, the inner cylinder 14 of the air candle 12 is arranged. Around the inner cylinder 14 around the outer cylinder 13 is arranged. In the space between these two cylinders, the cooling air is supplied or removed. The filaments 8 of the filament curtain 9 are arranged annularly around the outer cylinder 13. The cooling air flows, as indicated by the arrows, mainly radially through the Filamentschar 7. If there is an overpressure in the air filter 12, the cooling air flows radially outward through the filament curtain 9 and radially inwardly through the filament bundle 10, in the direction of the filled arrowheads , If a negative pressure is applied to the air filter 12, the cooling air flows radially inward through the filament curtain 9 and radially outward through the filament bundle 10, in the direction of the dashed arrowheads.

In dieser Ansicht wird deutlich, wie auf kleinstem Raum möglichst viele Filamente 8 ausgesponnen und abgekühlt werden können.In this view, it becomes clear how many filaments 8 can be spun out and cooled in the smallest space.

In Fig. 3 ist eine Querschnittsansicht eines zweiten Ausführungsbeispiels der erfindungsgemäßen Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens dargestellt. Viele Elemente entsprechen denen des ersten Ausführungsbeispiels aus Fig. 1, weswegen hier nur auf die Änderungen eingegangen wird.In Fig. 3 is a cross-sectional view of a second embodiment of the device according to the invention for carrying out the method according to the invention shown. Many elements are the same as the first Embodiment Fig. 1 , so here's just the changes.

Zwischen dem Außen-Zylinder 13 und dem Innen-Zylinder 14 ist hier ein Trenn-Zylinder 15 angeordnet, so dass ein dem Außen-Zylinder 13 zugeordneter Außen-Kanal 16 und ein dem Innen-Zylinder 14 zugeordneter Innen-Kanal 17 entsteht. So werden die Möglichkeiten zur Abstimmung der Kühlluftströme durch das Filamentbündel 10 und den Filamentvorhang 9 erweitert. Dazu werden dem Außen-Kanal 16 und dem Innen-Kanal 17 separate Mittel zur Strömungsbeeinflussung zugeordnet. Am Übergang zwischen Luftkanal 20 und Innen-Kanal 17 ist eine Innen-Drossel 19 angeordnet. Am Übergang zwischen Luftkanal 20 und Außen-Kanal 16 ist eine Außen-Drossel 18 angeordnet. Die Innen-Drossel 19 und die Außen-Drossel 18 können in Bezug auf Ihren Strömungswiderstand optional einstellbar sein. Diese beiden Drosseln können des Weiteren derart beschaffen sein, dass sie der Strömungsgleichrichtung dienen. Wie im ersten Ausführungsbeispiel aus Fig. 1 kann das Gebläse 21.1 entweder dazu dienen Kühlluft der Luftkerze 12 zuzuführen oder Kühlluft aus der Luftkerze 12 abzuführen.Between the outer cylinder 13 and the inner cylinder 14, a separating cylinder 15 is arranged here, so that an outer channel 16 assigned to the outer cylinder 13 and an inner channel 17 assigned to the inner cylinder 14 are formed. Thus, the possibilities for tuning the cooling air flows through the filament bundle 10 and the filament curtain 9 are expanded. For this purpose, separate means for influencing the flow are assigned to the outer channel 16 and the inner channel 17. At the transition between air duct 20 and inner channel 17, an inner throttle 19 is arranged. At the transition between air duct 20 and outer channel 16, an outer throttle 18 is arranged. The inner throttle 19 and the outer throttle 18 may be optionally adjustable with respect to their flow resistance. These two throttles can furthermore be designed such that they serve for the flow rectification. As in the first embodiment Fig. 1 For example, the blower 21. 1 may serve either to supply cooling air to the air candle 12 or to remove cooling air from the air candle 12.

In Fig. 4 ist schematisch eine Schnittansicht des zweiten Ausführungsbeispiels aus Fig. 3 entlang der Linie A-A dargestellt. Hier wird nur auf die Änderungen zum ersten Ausführungsbeispiel aus Fig. 2 eingegangen, da alle weiteren Elemente gleich sind. In dieser Ansicht unterscheiden sich die beiden Ausführungsbeispiele nur durch den Trenn-Zylinder 15, welcher den Raum zwischen Außen-Zylinder 13 und Innen-Zylinder 14 in den Außen-Kanal 16 und den Innen-Kanal 17 unterteilt.In Fig. 4 is a schematic sectional view of the second embodiment Fig. 3 shown along the line AA. Here, only the changes to the first embodiment will be made Fig. 2 received, since all other elements are the same. In this view, the two embodiments differ only by the separation cylinder 15, which divides the space between the outer cylinder 13 and inner cylinder 14 in the outer channel 16 and the inner channel 17.

Fig. 5 zeigt ein drittes Ausführungsbeispiel der erfindungsgemäßen Vorrichtung. Dieses ist bis auf die im Folgenden beschriebenen Unterschiede identisch aufbaut wie das zweite Ausführungsbeispiel aus Fig. 3. Die Außen-Drossel 18 und die Innen-Drossel 19 fehlen in diesem Ausführungsbeispiel. Dafür erhalten der Außen-Kanal 16 und der Innen-Kanal 17 jeweils eine separate Luftzu- bzw. Luftabfuhr. Dazu ist der Luftkanal 20 durch entsprechende Trennmittel unterteilt. Dem Außen-Kanal 16 ist so ein Gebläse 21.1 zugeordnet, dem Innen-Kanal 17 ein weiteres Gebläse 21.2. Auch auf diese Weise können die Kühlluftströme für das Filamentbündel 10 und den Filamentvorhang 9 separat voneinander eingestellt werden. Diese Variante mit zwei Gebläsen bietet vielfältige Möglichkeiten der Kühlluftführung. So können sowohl der Innen-Kanal 17 wie auch der Außen-Kanal 16 beide mit Überdruck oder beide mit Unterdruck beaufschlagt werden. Des Weiteren ist eine wechselseitige Ansteuerung möglich. So kann der Außen-Kanal 16 besaugt und der Innen-Kanal 17 mit Überdruck beaufschlagt werden oder umgekehrt. Fig. 5 shows a third embodiment of the device according to the invention. This is identical except for the differences described below builds up as the second embodiment Fig. 3 , The outer throttle 18 and the inner throttle 19 are missing in this embodiment. For the outer channel 16 and the inner channel 17 each receive a separate Luftzu- or air discharge. For this purpose, the air duct 20 is divided by appropriate separating means. The outer channel 16 is associated with a fan 21.1, the inner channel 17 another fan 21.2. Also in this way, the cooling air flows for the filament bundle 10 and the filament curtain 9 can be set separately from each other. This version with two blowers offers many possibilities for cooling air flow. Thus, both the inner channel 17 as well as the outer channel 16 are both subjected to pressure or both with negative pressure. Furthermore, a mutual control is possible. Thus, the outer channel 16 is evacuated and the inner channel 17 are pressurized or vice versa.

Mittels der oben beschriebenen Vorrichtungen und Verfahren ist eine besonders wirtschaftliche Produktion von Stapelfasern möglich. Zur Herstellung solcher Stapelfasern werden die Filamente nach der Abkühlung zunächst verstreckt im Anschluss gekräuselt und zuletzt geschnitten. Solche Polymerfasern dienen z.B. in der Textilindustrie als Ersatz von Baumwollfasern. By means of the devices and methods described above, a particularly economical production of staple fibers is possible. To produce such staple fibers, the filaments are first stretched after cooling and then crimped and finally cut. Such polymer fibers are used e.g. in the textile industry as a substitute for cotton fibers.

Claims (8)

  1. A device for melt spinning and cooling a group of filaments (7), having a spinning installation (1) which has a spinning-nozzle installation (4, 5) having a multiplicity of nozzle bores (6) for extruding filaments (8) into an annular filament curtain (9), and having a cooling installation (11) disposed below the spinning installation (1), which cooling installation has an air cartridge (12) held so as to be concentric with the spinning-nozzle installation (4, 5) in the interior of the filament curtain (9) by way of which air cartridge a cooling airflow flowing in a radially outward manner or radially inward manner is capable of being generated in the interior of the filament curtain (9) for cooling the filaments (8), wherein the external circumference of the air cartridge (12) is at least partially formed by a perforated external cylinder (13), characterized in that the air cartridge (12) is embodied so as to be hollow-cylindrical, and the internal circumference of the air cartridge (12) is at least partially formed by a perforated internal cylinder (14) and that the spinning-nozzle installation (4, 5) has at least two nozzle-bore zones, wherein a filament bundle (10) which is configured within the air cartridge (12) is capable of extrusion by means of one of these zones.
  2. The device as claimed in claim 1, characterized in that the nozzle-bore zones are formed by means of one or a plurality of spinning nozzles (5).
  3. The device as claimed in claim 1, characterized in that the external cylinder (13) and the internal cylinder (14) have a dissimilar aerodynamic resistance value.
  4. The device as claimed in claim 1, characterized in that the air cartridge (12) has one or a plurality of air ducts (20) for supplying air and/or discharging air.
  5. The device as claimed in claim 1, characterized in that a separation cylinder (15) is disposed within the air cartridge (12) such that an external duct (16) that is assigned to the external cylinder (13) and an internal duct (17) that is assigned to the internal cylinder (14) are created.
  6. The device as claimed in claim 5, characterized in that one or a plurality of air supplies is/are assigned each to the external duct (16) and to the internal duct (17), or in that one or a plurality of air discharges is/are assigned each to the external duct (16) and to the internal duct (17).
  7. The device as claimed in claim 5, characterized in that the external duct (16) and the internal duct (17) are each assigned at least one means for flow guiding or flow influencing, respectively.
  8. A method which is capable of being carried out by means of the device as claimed in claims 1 to 7, characterized in that the filaments (8) of the filament curtain (9) and the filaments (8) of the filament bundle (10) are cooled in an identical manner.
EP15784608.0A 2014-10-23 2015-10-16 Device and method for melt spinning and cooling a group of filaments Not-in-force EP3209820B1 (en)

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DE202005007132U1 (en) * 2005-05-04 2005-08-04 Diolen Industrial Fibers Gmbh Melt spinning plant for spinning and cooling filament groups has blowing chamber divided into smaller chambers by perforated or porous plates whose spacing changes along chamber length

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WO2016062626A1 (en) 2016-04-28
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JP2017531746A (en) 2017-10-26
CN107075735B (en) 2019-02-01
KR20170072927A (en) 2017-06-27
DE102014015729A1 (en) 2016-04-28

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