EP0837165A2 - Method for making a heat resistant yarn - Google Patents

Method for making a heat resistant yarn Download PDF

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Publication number
EP0837165A2
EP0837165A2 EP97117582A EP97117582A EP0837165A2 EP 0837165 A2 EP0837165 A2 EP 0837165A2 EP 97117582 A EP97117582 A EP 97117582A EP 97117582 A EP97117582 A EP 97117582A EP 0837165 A2 EP0837165 A2 EP 0837165A2
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EP
European Patent Office
Prior art keywords
fibers
sio
filaments
spinning
fed
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EP97117582A
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German (de)
French (fr)
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EP0837165A3 (en
Inventor
Claus Dipl.-Ing. Schierz
Martin Dipl.-Ing. Buchfeld
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Asglawo - Stoffe Zum Dammen und Verstarken GmbH
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Asglawo - Stoffe Zum Dammen und Verstarken GmbH
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Publication of EP0837165A2 publication Critical patent/EP0837165A2/en
Publication of EP0837165A3 publication Critical patent/EP0837165A3/en
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
    • D01H4/04—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques imparting twist by contact of fibres with a running surface
    • D01H4/16—Friction spinning, i.e. the running surface being provided by a pair of closely spaced friction drums, e.g. at least one suction drum
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
    • D02G3/16—Yarns or threads made from mineral substances
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
    • D02G3/36—Cored or coated yarns or threads
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/44—Yarns or threads characterised by the purpose for which they are designed
    • D02G3/443—Heat-resistant, fireproof or flame-retardant yarns or threads

Definitions

  • the invention relates to a method for producing a heat resistant yarn.
  • Silicon dioxide (SiO 2 ) is a suitable fiber material. It is characterized by a temperature resistance up to 1200 ° C and can be used in continuous operation at temperatures up to 1100 ° C. It has a low thermal conductivity, a high electrical resistance and is chemically resistant. At excess temperatures, no harmful decomposition products arise.
  • Heat-resistant yarns that consist exclusively of SiO 2 filaments are known. It is disadvantageous for numerous applications that the yarns, which consist exclusively of SiO 2 filaments, have a high density and a smooth surface. Attempts to produce bulkier yarns from SiO 2 filaments using texturing devices did not lead to the desired success.
  • Cotton fibers and numerous synthetic fibers for example polyester, polyamide, polypropylene and viscose fibers, can be used as staple fibers. Furthermore, some special fibers, such as fibers made of Kevlar, Nomex, carbon fibers and ceramic (AL 2 or 3 ) fibers, should be usable.
  • the invention has for its object to provide a method for producing a yarn from SiO 2 fibers, which is characterized by a low material density with sufficient tensile strength.
  • the yarn should be voluminous and have a fluffier surface than SiO 2 filament yarns.
  • the SiO 2 fiber fleece is preferably solidified to form the nonwoven by needling.
  • the SiO 2 staple fibers processed to form the nonwoven preferably have a fiber thickness of 5 to 10 micrometers and a fiber length of more than 10 millimeters.
  • the invention begins with the consideration of producing a friction yarn which consists exclusively or at least essentially of silicon dioxide and has a tensile core made of SiO 2 filaments and a voluminous sheath made of SiO 2 staple fibers.
  • a high abrasion resistance of the yarn is desired for the further processing of the yarn according to the invention in the course of the production of woven, knitted, crocheted and laid fabrics.
  • the invention teaches in a further embodiment that the nonwoven fabric is fed to a front section of the card drum in the direction of passage of the filaments and that a fiber sliver made of an abrasion-resistant, flame-resistant fiber material is fed to a rear section of the card drum, the fibers of which contain the SiO 2 - Wrapping fibers as a protective covering.
  • the protective covering preferably consists of polyester fibers, flame-retardant cellulose chemical fibers, high-temperature-resistant organic fibers or a mixture of these fibers.
  • the high-temperature-resistant organic fibers include, in particular, fibers made from fully aromatic polyamides, preferably aramid fibers.
  • the materials mentioned are characterized by good tensile strength and sufficient elasticity and are easy to process in an aerodynamic-mechanical friction spinning process.
  • a sufficient amount of fiber is sufficient, which is relatively small compared to the total amount of fiber processed.
  • the proportion of the protective sheath based on the SiO 2 proportion of the yarn is preferably less than 10 percent by weight.
  • the method according to the invention is characterized in that the abrasion-resistant protective covering takes place in the spinning unit and an additional coating station is not required. The system engineering effort is low.
  • the single figure shows the process diagram and a spinning unit for producing a heat-resistant yarn, which has a core made of SiO 2 filaments, a jacket made of SiO 2 staple fibers and a protective covering made of an abrasion-resistant, flame-retardant fiber material.
  • the spinning unit has two perforated, rotating in the same direction and equipped with suction inserts 1 spinning drums 2 and a card drum 3.
  • the SiO 2 filaments 4 run towards the spinning unit in the axial direction of the spinning drums 2.
  • a nonwoven fabric 5 made of staple SiO 2 fibers formed by carding and mechanical consolidation is fed to a section of the card drum 3 in the forward direction of the filaments 4.
  • the mechanical bonding of the nonwoven fabric 5 preferably consists of needling.
  • the SiO 2 staple fibers of the nonwoven fabric 5 expediently have a fiber thickness of 5 to 10 micrometers and have a fiber length of more than 10 millimeters.
  • the mechanically bonded nonwoven 5 is dissolved again in fibers 6 by means of the card drum 3, the detached fibers 6 being supported by an air stream being deposited in the gusset area between the spinning drums 2 and being turned on by a rolling process on the surface of the spinning drums 2 rotating in the same direction of rotation.
  • the staple fibers 6 wind around the SiO 2 filaments 4 running towards the spinning unit in the axial direction of the spinning drums 2 and form a voluminous sheath made of SiO 2 staple fibers.
  • an unconsolidated fiber sliver 7 made of a more abrasion-resistant fiber material is fed, the fibers of which are detached by means of the card drum 3 and wrap around the jacket formed from SiO 2 staple fibers as a protective covering.
  • the fuse is a loose fiber composite produced on a card. Suitable fiber materials are polyester fibers, flame-retardant cellulose chemical fibers and high-temperature-resistant organic fibers, in particular aramid fibers. These can be used alone or in a mixture.
  • the amount of fibers in the sliver 7 is such that the proportion of the protective sheath based on the SiO 2 proportion of the yarn is less than 10 percent by weight.

Abstract

The production of a heat-resistant yarn, a mechanically bonded web (5) of SiO2 staple fibres is by carding. The web (5) is fed to a spinner, together with SiO2 filaments (4), using two perforated spinning drums (2) with inner suction (1) and rotating in the same direction, together with a carding drum (3) which breaks the web (5) down into fibres (6). The loosened fibres (6) are carried by an air stream into the gap between the spinning drums (2), to be twisted in between them, to wind round the SiO2 filaments (4) moving along on the drum axis.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung eines hitzebeständigen Garns.The invention relates to a method for producing a heat resistant yarn.

Siliziumdioxid (SiO2) ist ein geeigneter Faserwerkstoff. Er zeichnet sich durch eine Temperaturfestigkeit bis 1200° C aus und ist im Dauerbetrieb bei Temperaturen bis 1100° C einsetzbar. Er besitzt eine geringe Wärmeleitfähigkeit, einen hohen elektrischen Widerstand und ist chemisch beständig. Bei Übertemperaturen entstehen keine schädlichen Zersetzungsprodukte.Silicon dioxide (SiO 2 ) is a suitable fiber material. It is characterized by a temperature resistance up to 1200 ° C and can be used in continuous operation at temperatures up to 1100 ° C. It has a low thermal conductivity, a high electrical resistance and is chemically resistant. At excess temperatures, no harmful decomposition products arise.

Hitzebeständige Garne, die ausschließlich aus SiO2-Filamenten bestehen, sind bekannt. Für zahlreiche Anwendungen ist nachteilig, daß die ausschließlich aus SiO2-Filamenten bestehenden Garne eine große Dichte sowie eine glatte Oberfläche besitzen. Versuche, durch Texturiereinrichtungen voluminösere Garne aus SiO2-Filamenten herzustellen, führten nicht zum gewünschten Erfolg.Heat-resistant yarns that consist exclusively of SiO 2 filaments are known. It is disadvantageous for numerous applications that the yarns, which consist exclusively of SiO 2 filaments, have a high density and a smooth surface. Attempts to produce bulkier yarns from SiO 2 filaments using texturing devices did not lead to the desired success.

Verfahren zur Herstellung von Friktionsgarnen, die einen Kern aus Filamenten und einen Mantel aus Stapelfasern aufweisen, sind seit langem bekannt (Firmendruckschriften "DREF - die zeitgemäße Spinntechnologie" 9/79 und "Zweikomponenten-Garne mit Gewinn. DREF3" der Firma Textilmaschinenfabrik Dr. Ernst Fehrer AG, A - 4021 Linz). Bei dem bekannten Verfahren werden Filamente sowie unverfestigte Lunten aus Stapelfasern einem Spinnaggregat zugeführt, welches zwei perforierte, gleichsinnig rotierend und mit Saugeinsätzen ausgerüstete Spinntrommeln sowie eine Kardentrommel aufweist. Die von den Lunten abgelösten Fasern, werden von einem Luftstrom unterstützt, im Zwickelbereich zwischen den Spinntrommel abgelegt sowie durch einen Abwälzvorgang an der Oberfläche der mit gleicher Drehrichtung umlaufenden Spinntrommel eingedreht. Dabei umwinden sie die Filamente, die dem Spinnaggregat in Achsrichtung der Spinntrommeln zulaufen. Als Stapelfasern sind Baumwollfasern und zahlreiche Synthesefasern, zum Beispiel Polyester-, Polyamid-, Polypropylen- und Viskosefasern, einsetzbar. Ferner sollen einige Spezialfasern, wie Fasern aus Kevlar, Nomex, Kohlenstoffasern und keramische (AL2o3) Fasern, einsetzbar sein.Processes for producing friction yarns that have a core made of filaments and a jacket made of staple fibers have long been known (company publications "DREF - the modern spinning technology" 9/79 and "two-component yarns with profit. DREF3" from the textile machine manufacturer Dr. Ernst Fehrer AG, A - 4021 Linz). In the known method, filaments and unconsolidated stapes made of staple fibers are fed to a spinning unit which has two perforated spinning drums rotating in the same direction and equipped with suction inserts, and a card drum. The fibers detached from the fuses are supported by an air flow, placed in the gusset area between the spinning drum and turned in by a rolling process on the surface of the spinning drum rotating in the same direction of rotation. They wind around the filaments that run towards the spinning unit in the axial direction of the spinning drums. Cotton fibers and numerous synthetic fibers, for example polyester, polyamide, polypropylene and viscose fibers, can be used as staple fibers. Furthermore, some special fibers, such as fibers made of Kevlar, Nomex, carbon fibers and ceramic (AL 2 or 3 ) fibers, should be usable.

Versuche, die nicht zum Stand der Technik gehören, haben gezeigt, daß Fasern aus Siliziumdioxid (SiO2-Fasern) nach dem bekannten Verfahren zur Herstellung eines Friktionsgarnes nicht verarbeitet werden können. Siliziumdioxid ist ein glattes, sehr brüchiges Material. Aufgrund dieser Materialeigenschaften ist die Zuführung der Stapelfasern in Form einer unverfestigten Lunte schwierig und verursacht überdies erhebliche Störungen im Spinnaggregat. Vor allem im Arbeitsbereich der Kardentrommel, der an die Kardentrommel anschließende und begrenzende Prallflächen und Leitwände umfaßt, wurden erhebliche, auf Faserbruch zurückzuführende Ablagerungen aus staubförmigem Fasermaterial festgestellt, welche die weitere Zuführung der Stapelfasern zu den Spinntrommeln blockierten oder zumindest stark störten.Experiments that do not belong to the prior art have shown that fibers made of silicon dioxide (SiO 2 fibers) cannot be processed by the known method for producing a friction yarn. Silicon dioxide is a smooth, very brittle material. Because of these material properties, the supply of the staple fibers in the form of an unconsolidated fuse is difficult and moreover causes considerable disruptions in the spinning unit. Especially in the working area of the card drum, which includes baffles and guide walls adjoining and delimiting the card drum, considerable deposits of dust-like fiber material due to fiber breakage were found, which blocked or at least severely disrupted the further supply of the staple fibers to the spinning drums.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren anzugeben, um ein Garn aus SiO2-Fasern herzustellen, das sich bei ausreichender Zugfestigkeit durch eine geringe Materialdichte auszeichnet. Das Garn soll voluminös sein und eine flauschigere Oberfläche als SiO2-Filamentgarne aufweisen.The invention has for its object to provide a method for producing a yarn from SiO 2 fibers, which is characterized by a low material density with sufficient tensile strength. The yarn should be voluminous and have a fluffier surface than SiO 2 filament yarns.

Gegenstand der Erfindung und Lösung dieser Aufgabe ist ein Verfahren zur Herstellung eines hitzebeständigen Garns, wobei

  • aus SiO2-Stapelfasern durch Krempeln und mechanische Verfestigung ein Vliesstoff hergestellt wird,
  • der Vliesstoff und SiO2-Filamente einem Spinnaggregat zugeführt werden, welches zwei perforierte, gleichsinnig rotierende und mit Saugeinsätzen ausgerüstete Spinntrommeln sowie eine Kardentrommel aufweist,
  • der mechanisch verfestigte Vliesstoff mittels der Kardentrommel wieder in Fasern aufgelöst wird und
  • die abgelösten Fasern von einem Luftstrom unterstützt im Zwickelbereich zwischen den Spinntrommel abgelegt sowie durch einen Abwälzvorgang an der Oberfläche der mit gleicher Drehrichtung umlaufenden Spinntrommeln eingedreht werden und dabei die SiO2-Filamente, die dem Spinnaggregat in Achsrichtung der Spinntrommeln zulaufen, umwinden.
    • The object of the invention and solution to this problem is a method for producing a heat-resistant yarn, wherein
  • a non-woven fabric is produced from SiO 2 staple fibers by carding and mechanical consolidation,
  • the nonwoven and SiO 2 filaments are fed to a spinning unit which has two perforated spinning drums rotating in the same direction and equipped with suction inserts, and a carding drum,
  • the mechanically bonded nonwoven is dissolved again into fibers by means of the card drum and
  • the detached fibers, supported by an air flow, are deposited in the gusset area between the spinning drums and are rolled in by a rolling process on the surface of the spinning drums rotating in the same direction of rotation, thereby winding around the SiO 2 filaments that run towards the spinning unit in the axial direction of the spinning drums.

    • Die Verfestigung des SiO2-Faservlieses unter Bildung des Vliesstoffes erfolgt vorzugsweise durch Vernadeln. Die zu dem Vliesstoff verarbeiteten SiO2-Stapelfasern weisen bevorzugt eine Faserdicke von 5 bis 10 Mikrometern und eine Faserlänge von mehr als 10 Millimetern auf.The SiO 2 fiber fleece is preferably solidified to form the nonwoven by needling. The SiO 2 staple fibers processed to form the nonwoven preferably have a fiber thickness of 5 to 10 micrometers and a fiber length of more than 10 millimeters.

    Die Erfindung setzt ein mit der Überlegung, ein Friktionsgarn herzustellen, das ausschließlich oder zumindest im wesentlichen aus Siliziumdioxid besteht und einen zugfesten Kern aus SiO2-Filamenten sowie einen voluminösen Mantel aus SiO2-Stapelfasern aufweist. Die eingangs beschriebenen technischen Probleme bei der Verarbeitung von SiO2-Stapelfasern zu einem Friktionsgarn, die der Fachmann aufgrund der Materialeigenschaften von Siliziumdioxid erwarten mußte, treten überraschenderweise nicht auf, wenn die SiO2-Stapelfasern in Form eines mechanisch verfestigten Vliesstoffes dem Spinnaggregat zugeführt werden. Dies ist um so überraschender, als eine mechanische Verfestigung eines Faserflores eine zusätzliche Beanspruchung der Fasern darstellt, bei der eine Schädigung der Fasern hätte erwartet werden können.The invention begins with the consideration of producing a friction yarn which consists exclusively or at least essentially of silicon dioxide and has a tensile core made of SiO 2 filaments and a voluminous sheath made of SiO 2 staple fibers. The technical problems described at the outset when processing SiO 2 staple fibers into a friction yarn, which the person skilled in the art had to expect due to the material properties of silicon dioxide, surprisingly do not occur when the SiO 2 staple fibers are fed to the spinning unit in the form of a mechanically consolidated nonwoven. This is all the more surprising since mechanical consolidation of a fiber web represents an additional stress on the fibers, in which damage to the fibers could have been expected.

    Für die weitere Verarbeitung des erfindungsgemäßen Garns im Zuge der Herstellung von Geweben, Gewirken, Gestricken und Gelegen wird eine hohe Abriebsfestigkeit des Garns gewünscht. Zur Verbesserung der Abriebsfestigkeit lehrt die Erfindung in weiterer Ausgestaltung, daß der Vliesstoff einem in Durchlaufrichtung der Filamente vorderen Abschnitte der Kardentrommel zugeführt wird und daß eine Faserlunte aus einem abriebfesteren, schwer entflammbaren Fasermaterial einem hinteren Abschnitt der Kardentrommel zugeführt wird, dessen Fasern die SiO2-Fasern als Schutzumhüllung umwinden. Vorzugsweise besteht die Schutzumhüllung aus Polyesterfasern, schwer entflammbaren Cellulose-Chemiefasern, hochtemperaturbeständigen organischen Fasern oder einer Mischung dieser Fasern. Zu den hochtemperaturbeständigen organischen Fasern gehören insbesondere Fasern aus vollaromatischen Polyamiden, vorzugsweise Aramid-Fasern. Die genannten Materialien zeichnen sich durch eine gute Zugfestigkeit und ausreichende Elastizität aus und sind in einem aerodynamisch-mechanischen Friktionsspinnverfahren gut verarbeitbar. Zur Bildung einer Schutzumhüllung, welche die Abriebsfestigkeit des SiO2-Friktionsgarns verbessert, ist eine Fasermenge ausreichend, die im Vergleich zu der insgesamt verarbeiteten Fasermenge verhältnismäßig klein ist. Vorzugsweise beträgt der Anteil der Schutzumhüllung bezogen auf den SiO2-Anteil des Garns weniger als 10 Gewichtsprozent. Das erfindungsgemäße Verfahren zeichnet sich dadurch aus, daß die abriebsfeste Schutzumhüllung im Spinnaggregat erfolgt und eine zusätzliche Beschichtungsstation nicht erforderlich ist. Der anlagentechnische Aufwand ist gering.A high abrasion resistance of the yarn is desired for the further processing of the yarn according to the invention in the course of the production of woven, knitted, crocheted and laid fabrics. In order to improve the abrasion resistance, the invention teaches in a further embodiment that the nonwoven fabric is fed to a front section of the card drum in the direction of passage of the filaments and that a fiber sliver made of an abrasion-resistant, flame-resistant fiber material is fed to a rear section of the card drum, the fibers of which contain the SiO 2 - Wrapping fibers as a protective covering. The protective covering preferably consists of polyester fibers, flame-retardant cellulose chemical fibers, high-temperature-resistant organic fibers or a mixture of these fibers. The high-temperature-resistant organic fibers include, in particular, fibers made from fully aromatic polyamides, preferably aramid fibers. The materials mentioned are characterized by good tensile strength and sufficient elasticity and are easy to process in an aerodynamic-mechanical friction spinning process. To form a protective covering which improves the abrasion resistance of the SiO 2 friction yarn, a sufficient amount of fiber is sufficient, which is relatively small compared to the total amount of fiber processed. The proportion of the protective sheath based on the SiO 2 proportion of the yarn is preferably less than 10 percent by weight. The method according to the invention is characterized in that the abrasion-resistant protective covering takes place in the spinning unit and an additional coating station is not required. The system engineering effort is low.

    Im folgenden wird die Erfindung anhand einer lediglich ein Ausführungsbeispiel darstellenden Zeichnung ausführlich erläutert. Die einzige Figur zeigt das Verfahrensschema sowie ein Spinnaggregat zur Herstellung eines hitzebeständigen Garns, welches einen Kern aus SiO2-Filamenten, einen Mantel aus SiO2-Stapelfasern und eine Schutzumhüllung aus einem abriebfesten, schwer entflammbaren Fasermaterial aufweist.In the following, the invention is explained in detail with reference to a drawing that shows only one exemplary embodiment. The single figure shows the process diagram and a spinning unit for producing a heat-resistant yarn, which has a core made of SiO 2 filaments, a jacket made of SiO 2 staple fibers and a protective covering made of an abrasion-resistant, flame-retardant fiber material.

    Das Spinnaggregat weist zwei perforierte, gleichsinnig rotierende und mit Saugeinsätzen 1 ausgerüstete Spinntrommeln 2 sowie eine Kardentrommel 3 auf. Die SiO2-Filamente 4 laufen dem Spinnaggregat in Achsrichtung der Spinntrommeln 2 zu. Ein durch Krempeln und mechanische Verfestigung gebildeter Vliesstoff 5 aus SiO2-Stapelfasern wird einem in Durchlaufrichtung der Filamente 4 vorderen Abschnitt der Kardentrommel 3 zugeführt. Die mechanische Verfestigung des Vliesstoffes 5 besteht vorzugsweise in einer Vernadelung. Die SiO2-Stapelfasern des Vliesstoffes 5 haben zweckmäßig eine Faserdicke von 5 bis 10 Mikrometern und besitzen eine Faserlänge von mehr als 10 Millimetern. Der mechanisch verfestigte Vliesstoff 5 wird mittels der Kardentrommel 3 wieder in Fasern 6 aufgelöst, wobei die abgelösten Fasern 6 von einem Luftstrom unterstützt im Zwickelbereich zwischen den Spinntrommeln 2 abgelegt sowie durch einen Abwälzvorgang an der Oberfläche der mit gleicher Drehrichtung umlaufenden Spinntrommeln 2 eingedreht werden. Dabei umwinden die Stapelfasern 6 die dem Spinnaggregat in Achsrichtung der Spinntrommeln 2 zulaufenden SiO2-Filamente 4 und bilden einen voluminösen Mantel aus SiO2-Stapelfasern.The spinning unit has two perforated, rotating in the same direction and equipped with suction inserts 1 spinning drums 2 and a card drum 3. The SiO 2 filaments 4 run towards the spinning unit in the axial direction of the spinning drums 2. A nonwoven fabric 5 made of staple SiO 2 fibers formed by carding and mechanical consolidation is fed to a section of the card drum 3 in the forward direction of the filaments 4. The mechanical bonding of the nonwoven fabric 5 preferably consists of needling. The SiO 2 staple fibers of the nonwoven fabric 5 expediently have a fiber thickness of 5 to 10 micrometers and have a fiber length of more than 10 millimeters. The mechanically bonded nonwoven 5 is dissolved again in fibers 6 by means of the card drum 3, the detached fibers 6 being supported by an air stream being deposited in the gusset area between the spinning drums 2 and being turned on by a rolling process on the surface of the spinning drums 2 rotating in the same direction of rotation. In the process, the staple fibers 6 wind around the SiO 2 filaments 4 running towards the spinning unit in the axial direction of the spinning drums 2 and form a voluminous sheath made of SiO 2 staple fibers.

    An einem in Durchlaufrichtung der Filamente hinteren Abschnitt der Kardentrommel 3 wird eine unverfestigte Faserlunte 7 aus einem abriebfesteren Fasermaterial zugeführt, dessen Fasern mittels der Kardentrommel 3 abgelöst werden und den aus SiO2-Stapelfasern gebildeten Mantel als Schutzumhüllung umwinden. Die Lunte stellt einen losen, auf einer Karde hergestellten Faserverbund dar. Als Fasermaterialien kommen Polyesterfasern, schwer entflammbare Cellulose-Chemiefasern sowie hochtemperaturbeständige organische Fasern, insbesondere Aramid-Fasern, in Betracht. Diese können allein oder in einer Mischung eingesetzt werden. Die Fasermenge der Lunte 7 ist so bemessen, daß der Anteil der Schutzumhüllung bezogen auf den SiO2-Anteil des Garns weniger als 10 Gewichtsprozent beträgt.At a rear section of the card drum 3 in the direction of flow of the filaments, an unconsolidated fiber sliver 7 made of a more abrasion-resistant fiber material is fed, the fibers of which are detached by means of the card drum 3 and wrap around the jacket formed from SiO 2 staple fibers as a protective covering. The fuse is a loose fiber composite produced on a card. Suitable fiber materials are polyester fibers, flame-retardant cellulose chemical fibers and high-temperature-resistant organic fibers, in particular aramid fibers. These can be used alone or in a mixture. The amount of fibers in the sliver 7 is such that the proportion of the protective sheath based on the SiO 2 proportion of the yarn is less than 10 percent by weight.

    Claims (6)

    Verfahren zur Herstellung eines hitzebeständigen Garns, wobei aus SiO2-Stapelfasern durch Krempeln und mechanische Verfestigung ein Vliesstoff (5) hergestellt wird, der Vliesstoff (5) und SiO2-Filamente (4) einem Spinnaggregat zugeführt werden, welches zwei perforierte, gleichsinnig rotierende und mit Saugeinsätzen (1) ausgerüstete Spinntrommeln (2) sowie eine Kardentrommel (3) aufweist, der mechanisch verfestigte Vliesstoff (5) mittels der Kardentrommel (3) wieder in Fasern (6) aufgelöst wird und die abgelösten Fasern (6) von einem Luftstrom unterstützt im Zwickelbereich zwischen den Spinntrommeln (2) abgelegt sowie durch einen Abwälzvorgang an der Oberfläche der mit gleicher Drehrichtung umlaufenden Spinntrommeln (2) eingedreht werden und dabei die SiO2-Filamente (4), die dem Spinnaggregat in Achsrichtung der Spinntrommeln (2) zulaufen, umwinden. A method of manufacturing a heat resistant yarn, wherein a non-woven fabric (5) is produced from SiO 2 staple fibers by carding and mechanical consolidation, the nonwoven fabric (5) and SiO 2 filaments (4) are fed to a spinning unit which has two perforated spinning drums (2) rotating in the same direction and equipped with suction inserts (1) and a carding drum (3), the mechanically bonded nonwoven (5) is dissolved again in fibers (6) by means of the card drum (3) and the detached fibers (6), supported by an air stream, are deposited in the gusset area between the spinning drums (2) and are turned in by a rolling process on the surface of the spinning drums (2) rotating in the same direction of rotation, and thereby the SiO 2 filaments (4), which Run the spinning unit in the axial direction of the spinning drums (2), wind around. Verfahren nach Anspruch 1, wobei die Verfestigung des Vliesstoffes (5) durch Vernadeln erfolgt. The method of claim 1, wherein the solidification of the Nonwoven fabric (5) by needling. Verfahren nach Anspruch 1 oder 2, wobei die SiO2-Stapelfasern eine Faserdicke von 5 bis 10 Mikrometern und eine Faserlänge von mehr als 10 Millimetern aufweisen.The method of claim 1 or 2, wherein the SiO 2 staple fibers have a fiber thickness of 5 to 10 microns and a fiber length of more than 10 millimeters. Verfahren nach einem der Ansprüche 1 bis 3, wobei der Vliesstoff (5) einem in Durchlaufrichtung der Filamente vorderen Abschnitt der Kardentrommel (3) zugeführt wird und wobei eine Faserlunte (7) aus einem abriebfesteren, schwer entflammbaren Fasermaterial einem hinteren Abschnitt der Kardentrommel (3) zugeführt wird, dessen Fasern die SiO2-Fasern als Schutzumhüllung umwinden.Method according to one of claims 1 to 3, wherein the nonwoven fabric (5) is fed to a front section of the card drum (3) in the direction of passage of the filaments and wherein a fiber sliver (7) made of a more abrasion-resistant, flame-retardant fiber material is fed to a rear section of the card drum (3 ) is supplied, the fibers of which wind around the SiO 2 fibers as a protective covering. Verfahren nach Anspruch 4, wobei die Schutzumhüllung aus Polyesterfasern, schwer entflammbaren Cellulose-Chemiefasern oder hochtemperaturbeständigen organischen Fasern oder aus einer Mischung dieser Fasern besteht.The method of claim 4, wherein the protective sheath is made of Polyester fibers, flame retardant cellulose chemical fibers or high temperature resistant organic fibers or consists of a mixture of these fibers. Verfahren nach Anspruch 4 oder 5, wobei der Anteil der Schutzumhüllung bezogen auf den SiO2-Anteil des Garns weniger als 10 Gewichtsprozent beträgt.The method of claim 4 or 5, wherein the proportion of the protective sheath based on the SiO 2 portion of the yarn is less than 10 percent by weight.
    EP97117582A 1996-10-16 1997-10-10 Method for making a heat resistant yarn Withdrawn EP0837165A3 (en)

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    DE1996142715 DE19642715A1 (en) 1996-10-16 1996-10-16 Process for the production of a heat-resistant yarn
    DE19642715 1996-10-16

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    EP0837165A2 true EP0837165A2 (en) 1998-04-22
    EP0837165A3 EP0837165A3 (en) 1999-02-17

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    Cited By (4)

    * Cited by examiner, † Cited by third party
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    EP1270778A1 (en) * 2001-06-29 2003-01-02 Maschinenfabrik Rieter Ag Process and apparatus for producing staple-yarns which contain synthetic fibres
    EP1760175A1 (en) * 2005-08-31 2007-03-07 Kufner Textilwerke GmbH Electrically conductive, elastically stretchable hybrid yarn, method for the manufacture thereof and textile product with a hybrid yarn of this kind
    CN102251322A (en) * 2011-07-19 2011-11-23 方鸿亨 Silver adsorption, coagulation and twisting method and device for friction spinning machine
    CN112442774A (en) * 2020-12-14 2021-03-05 东台市华阳玻纤有限责任公司 Technology for blending core-spun yarn by using chopped glass fiber

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    DE4221001A1 (en) * 1992-06-26 1994-01-05 Frenzelit Werke Gmbh & Co Kg Temperature-resistant yarn-plied yarn, consists 60-95 weight per cent of staple fibres - made of drawn mineral fibres with min. fibre dia. of over 3 micrometers

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    Cited By (5)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    EP1270778A1 (en) * 2001-06-29 2003-01-02 Maschinenfabrik Rieter Ag Process and apparatus for producing staple-yarns which contain synthetic fibres
    EP1760175A1 (en) * 2005-08-31 2007-03-07 Kufner Textilwerke GmbH Electrically conductive, elastically stretchable hybrid yarn, method for the manufacture thereof and textile product with a hybrid yarn of this kind
    JP2007063742A (en) * 2005-08-31 2007-03-15 Kufner Textilwerke Gmbh Electrically conductive, elastically stretchable hybrid yarn, method for manufacture thereof and textile product with hybrid yarn of this kind
    CN102251322A (en) * 2011-07-19 2011-11-23 方鸿亨 Silver adsorption, coagulation and twisting method and device for friction spinning machine
    CN112442774A (en) * 2020-12-14 2021-03-05 东台市华阳玻纤有限责任公司 Technology for blending core-spun yarn by using chopped glass fiber

    Also Published As

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    EP0837165A3 (en) 1999-02-17
    DE19642715A1 (en) 1998-04-23

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