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EP0846197A1 - Process for producing a high-strength, high-shrinkage polyamide 66 filament yarn - Google Patents

Process for producing a high-strength, high-shrinkage polyamide 66 filament yarn

Info

Publication number
EP0846197A1
EP0846197A1 EP96926310A EP96926310A EP0846197A1 EP 0846197 A1 EP0846197 A1 EP 0846197A1 EP 96926310 A EP96926310 A EP 96926310A EP 96926310 A EP96926310 A EP 96926310A EP 0846197 A1 EP0846197 A1 EP 0846197A1
Authority
EP
European Patent Office
Prior art keywords
yarn
winding
polyamide
filament
wound
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP96926310A
Other languages
German (de)
French (fr)
Other versions
EP0846197B1 (en
Inventor
Klaus Fischer
Hans Linz
Luzius Berger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ExNex AG
Original Assignee
Rhone Poulenc Viscosuisse SA
Societe de la Viscose Suisse SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rhone Poulenc Viscosuisse SA, Societe de la Viscose Suisse SA filed Critical Rhone Poulenc Viscosuisse SA
Publication of EP0846197A1 publication Critical patent/EP0846197A1/en
Application granted granted Critical
Publication of EP0846197B1 publication Critical patent/EP0846197B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • D02J1/00—Modifying the structure or properties resulting from a particular structure; Modifying, retaining, or restoring the physical form or cross-sectional shape, e.g. by use of dies or squeeze rollers
    • D02J1/22—Stretching or tensioning, shrinking or relaxing, e.g. by use of overfeed and underfeed apparatus, or preventing stretch
    • 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
    • D02J1/00—Modifying the structure or properties resulting from a particular structure; Modifying, retaining, or restoring the physical form or cross-sectional shape, e.g. by use of dies or squeeze rollers
    • D02J1/22—Stretching or tensioning, shrinking or relaxing, e.g. by use of overfeed and underfeed apparatus, or preventing stretch
    • D02J1/228—Stretching in two or more steps, with or without intermediate steps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2933—Coated or with bond, impregnation or core
    • Y10T428/2964—Artificial fiber or filament
    • Y10T428/2967—Synthetic resin or polymer
    • Y10T428/2969—Polyamide, polyimide or polyester

Definitions

  • the invention relates to a process for producing a high-strength, high-shrinkage polyamide 66 filament yarn for industrial fabrics, in particular airbag fabrics, by multi-stage drawing of polyamide 66 LOY by means of at least three heatable draw roller units or godet duos and direct winding of the drawn yarn into a cylindrical package * especially to a package, and a polyamide 66 filament yarn.
  • cops are generally used to wind up shrinking thermoplastic filaments, whereby they are given a protective thread which is favorable for further processing.
  • the disadvantage of cop winding is that the maximum winding speeds are in the range of only a few hundred meters per minute.
  • Another disadvantage of the cop winding is that the yarn capacity of a stretch cop is generally limited to approximately 4 kg of yarn. Such a process no longer guarantees economical yarn production.
  • the direct winding up of shrinkable yarns into cylindrical bobbins would be desirable. So far, however, it has not been possible to wind yarns made of thermoplastic polymers with high thermal shrinkage. Such Yarns must have an undesirable reduction in the
  • a process for the production of polyamide 66 filament yarn in which an undrawn yarn made of polyhexamethylene adipamide, with a relative viscosity in formic acid from 60 to 100, is drawn in one or two stages.
  • the device suitable for this purpose consists of several heated stretching roller units. To improve the stretchability of the yarn, additional heat sources in the form of contact heaters are provided between the stretching rollers. It is known that in the melt spinning process, at a winding speed of 4500 m / min and above, the winding tension is increased so that a paper spool can no longer be removed from the winding machine. The problem is solved in this method by relaxing about 10%.
  • the known yarns are wound up at a maximum speed of 20 m / min.
  • the aim of the known method is to produce what are known as dimensionally stable filament yarns for tire cord fabric, with high strength, high elongation and low shrinkage, if possible below 5%.
  • the stretching conditions and in particular the winding conditions on cross-wound bobbins are optimized for these yarns. Recently, however, specifically for use in
  • Airbag fabrics increasingly also yarns with high
  • Thermoshrink used It is not difficult to produce such types of yarn, but they cannot be wound on packages without problems.
  • the object of the invention is to provide a method for the direct winding of high-strength synthetic threads following the hot stretching process, directly on packages.
  • Another object is to produce a high tenacity, high shrink polyamide 66 filament yarn and provide it on a package.
  • the temperature of the last stretching roller unit before winding up is between 70 ° C. and 160 ° C., in particular 80 ° C. and 150 ° C., preferably to 90 ° C.-140 ° ° C and the winding tension to less than 0.2 cN / tex, in particular to less than 0.15 cN / tex, preferably less than 0.13 cN / tex.
  • the thread tension in the winding area is essentially determined by the relaxation ratio, i.e. by the ratio of the speeds of the last
  • Stretch godet and the winding device determined. It is expedient to choose the relaxation ratio between 4 and 10%.
  • Formic acid according to ASTM 0789-81 a strength of at least 60 cN / tex, an elongation of 10-25% and a thermal shrinkage of 7-11% at 160 ° C and is one
  • the polyamide 66 filament yarn according to the invention is suitable for industrial fabrics, in particular for airbag fabrics, which, in addition to being very strong, should also have particularly high thermal shrinkage.
  • Fig. 1 shows schematically the inventive method
  • an undrawn polyamide 66-LOY filament is designated by the reference numeral 1.
  • the filament is fed from a delivery roller (not shown) to a first heated draw roll unit 2.
  • the undrawn filament 1 is slightly stretched by approximately 3% between the delivery roller and the first stretching roller unit 2 in order to impart a minimal tension to the filament 1.
  • the thread tension must be selected so that a sufficient frictional connection between the filament 1 and the surface of the drawing roller unit 2 is ensured in order to provide the necessary resistance to the drawing force occurring in the first drawing step.
  • a second heated to about 180 ° C The stretching roller assembly 3 and the first stretching roller assembly 2 are subjected to a first stretching.
  • a third stretching roller unit 4 with a surface temperature of 70 ° C to 150 ° C is connected downstream of the heated stretching roller unit 3 and causes a further second stretching.
  • the drawn filament 5 is wound onto a cheese 6.
  • the filament is wound up at a speed which is set about 6% lower than the speed of the unit 4.
  • the winding tension is thereby set to, for example, 0.13 cN / dtex. All stretching roller units are wrapped several times by the filament 1, on the one hand to ensure the required frictional connection for drawing and on the other hand to ensure sufficient heat exchange between the heated roll surfaces and the filament 1.
  • FIG. 2 differs from FIG. 1 by an additional stretching roller unit 7.
  • the stretching roller unit 7 is heated, for example, to a temperature of 180.degree.
  • the second stretching is carried out between the stretching roller units 3 and 7, while the temperature of the stretching roller unit 4 is not changed compared to the arrangement in FIG. 1.
  • the speed of the stretching roller assembly 4 is at least as high as that of the stretching roller assembly 7.
  • the device according to FIG. 1 is exemplary and not exclusively suitable for carrying out the method.
  • a device suitable for the process can also consist of godet duos instead of the stretching roller units with separating rollers. Furthermore, between the units further elements for thermal
  • Treatment of the yarn such as block or radiant heaters, hot air or steam nozzles can be arranged. Furthermore, it is expedient to swirl the yarn to be wound up by means of an air nozzle or the like, in order thereby to improve the further processability.
  • This device is also not suitable for only one filament thread, in the case of finer yarns, for example with a titer of 470 dtex or less, two or more filament threads can also be drawn at the same time and wound on a corresponding multi-ended winding unit.
  • the operating speed of this device is in the range between 300 and 3,000 m / min. It is therefore much more productive than conventional draw twisting machines which deposit the thread on Co P ⁇ . Cross-wound bobbins with a thread mass of more than 10 kg can also be produced. Compared to the presentation of the cops with a maximum of 4 kg, far fewer manipulations are required.
  • the high working speed does not limit the usability to the stretching of already wound LOY filament yarns. In principle, it is also suitable for use in an integrated spin-stretch process.
  • the relaxation of the yarn must be prevented as far as possible to create a shrinking yarn.
  • the task is therefore to provide a process that winds up a yarn that is as unrelaxed as possible. Theoretically, this can be done by setting the speed of the winding unit to be the same or only slightly slower than that of the last godet unit. However, this results in very high thread tensions, under which the construction of a package is generally not possible.
  • a LOY filament yarn made of polyamide 66 with a relative viscosity (RV) in formic acid of 45 and a spin titer of 1,270 dtex was passed over the device according to FIG. 1 in two threads.
  • the filament yarn was drawn in two stages in a ratio of 5.3: 1 to the titer 235 dtex under the conditions given in Table 1 and relaxed by 6.8% within the winding zone, ie between the drawing roller unit 4 and the package 5.
  • the temperature of the last stretching unit was 230 ° C.
  • the filament yarn obtained had a strength of 74.5 cN / dtex with an elongation at break of 22% and a thermal shrinkage at 160 ° C of 3.6%.
  • it is not suitable for special applications, for example in the area of airbag fabrics, because of the low thermal shrinkage.
  • Example 2 (comparison)
  • a LOY filament yarn made of polyamide 66 with a relative viscosity (RV) in formic acid of 45 and with a high thermal shrinkage suitable for airbag fabrics was achieved under the essentially same stretching conditions as in Example 1 by raising the temperature of the last stretch godet to 160 ° C was lowered.
  • the relaxation ratio was insignificantly reduced to 5.7% compared to Example 1.
  • the yarn obtained had a strength of 72 cN / tex with an elongation at break of 16.6% and a thermal shrinkage at 160 ° C of 9.2%.
  • the intolerable disadvantage of this method was that, due to the lowering of the temperature of the last stretch godet, the thread tension in the winding area was so high at 0.38 cN / dtex that no acceptable bobbins could be built up. After just 1.5 kg of thread support, the bobbins were deformed to such an extent and bulged on the flanks that they protruded on both sides of the yarn tubes serving as carriers. Such a spool is used both for shipping and for processing, e.g. unsuitable in a weaving mill.
  • a LOY filament yarn made of polyamide 66 with a relative viscosity (RV) in formic acid of 45 with a high thermal shrinkage suitable for airbag fabrics was achieved under the essentially same stretching conditions as in Example 1 by raising the temperature of the last stretch godet to 105 ° C was lowered. The relaxation ratio was insignificantly reduced to 6.5% compared to Example 1.
  • the yarn obtained had a tenacity of 74.2 cN / tex with an elongation at break of 17.4% and a thermal shrinkage 160 ° C from 9.0%.
  • the thread tension in the winding area was surprisingly only 0.13 cN / dtex as in Example 1. In this way, cross-wound bobbins with 7.5 kg of thread support could be produced without problems.
  • the aspect of these coils was good: the flanks were straight and no shoulder formation was observed on the coil circumference.
  • Table 1 shows the process parameters according to the method according to the invention, with stretching on a stretching machine with three heated stretching roller units, godets with separating roller in two stages at 800 m / min final speed to 5.4 times its original length.
  • the thread properties are given in the same table.
  • the device according to the invention has two essential advantages over the known devices. On the one hand, two or more threads can be drawn and wound up at the same time, and on the other hand, the production speed can be increased compared to conventional drawing twists because of the more efficient winding on cross-wound bobbins.
  • the yarn according to the invention is particularly suitable for the production of airbag fabrics.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Artificial Filaments (AREA)
  • Air Bags (AREA)

Abstract

A nylon 66 filament yarn having a tenacity of at least 60 cn/tex, an elongation of 10 to 25% and a hot air shrinkage of 7-11% (160 C).

Description

Verfahren zur Herstellung eines hochfesten, hochschrumpfenden Polyamid-66-Filamentgarns Process for producing a high-strength, high-shrinking polyamide 66 filament yarn
Die Erfindung betrifft ein Verfahren zur Herstellung eines hochfesten, hochschrumpfenden Polyamid-66- Filamentgarns für industrielle Gewebe, insbesondere Airbaggewebe, durch mehrstufiges Verstrecken von Polyamid-66-LOY mittels wenigstens drei beheizbaren Streckrollenaggregaten oder Galettenduos und unmittelbarem Aufspulen des verstreckten Garns zu einem zylindrischen Garnkörpers* insbesondere zu einer Kreuzspule, sowie ein Polyamid-66-Filamentgarn.The invention relates to a process for producing a high-strength, high-shrinkage polyamide 66 filament yarn for industrial fabrics, in particular airbag fabrics, by multi-stage drawing of polyamide 66 LOY by means of at least three heatable draw roller units or godet duos and direct winding of the drawn yarn into a cylindrical package * especially to a package, and a polyamide 66 filament yarn.
Zum Aufspulen von hochschrumpfenden thermoplastischen Filamenten werden in der Regel sogenannte Copse verwendet, wobei ihnen ein für die Weiterverarbeitung günstiger Schutzzwirn erteilt wird. Der Nachteil der CopsaufWicklung liegt jedoch darin, dass die maximalen Aufspulgeschwindigkeiten im Bereich von nur einigen hundert Metern pro Minute liegen. Ein weiterer Nachteil der CopsaufWicklung besteht darin, dass die Garnkapazität eines Streckcops generell auf ca. 4 kg Garn limitiert iεt. Eine wirtschaftliche Garnherstellung ist nach einem solchen Verfahren nicht mehr gewährleistet . Das unmittelbare Aufspulen von Hochschrumpfgarnen zu zylindrischen Spulen wäre wünschenswert. Es ist aber bisher nicht möglich gewesen, Garne aus thermoplastischen Polymeren mit hohem Thermoschrumpf aufzuwickeln. Solche Garne müssen, um eine unerwünschte Reduktion desSo-called cops are generally used to wind up shrinking thermoplastic filaments, whereby they are given a protective thread which is favorable for further processing. The disadvantage of cop winding, however, is that the maximum winding speeds are in the range of only a few hundred meters per minute. Another disadvantage of the cop winding is that the yarn capacity of a stretch cop is generally limited to approximately 4 kg of yarn. Such a process no longer guarantees economical yarn production. The direct winding up of shrinkable yarns into cylindrical bobbins would be desirable. So far, however, it has not been possible to wind yarns made of thermoplastic polymers with high thermal shrinkage. Such Yarns must have an undesirable reduction in the
Thermoschrumpfs zu verhindern, unter relativ hohen Fadenspannungen aufgespult werden. Dies hat gravierende Nachteile auf den Spulenaufbau. Infolge der hohen Fadenzugkraft entstehen innerhalb der Kreuzspule so hohe Radialkräfte, dass einerseits die Spulenhülsen deformiert werden, so dass die vollen Spulen nicht mehr vom Dorn der Spulmaschine abgenommen werden können*-3-*-11 weiterer Nachteil besteht andererseits darin, dass untolerierbare Wickeldeformationen beobachtet werden, die den Aufbau voller Spulen unmöglich machen.To prevent thermal shrinkage, be wound up under relatively high thread tensions. This has serious disadvantages on the coil structure. As a result of the high thread tension, radial forces are generated within the package that the bobbin tubes are deformed so that the full bobbins can no longer be removed from the mandrel of the winding machine * - 3 - * - 11 Another disadvantage is that intolerable winding deformations are observed that make building full coils impossible.
Aus der DE-A-34 37 943 ist ein Verfahren zur Herstellung von Polyamid-66-Filamentgarn bekannt, bei welchem ein unverstrecktes Garn aus Polyhexamethylenadipinsäureamid, mit einer relativen Viskosität in Ameisensäure von 60 bis 100, einstufig oder zweistufig verstreckt wird. Die hierzu geeignete Vorrichtung, besteht aus mehreren beheizten Streckrollenaggregaten. Zur Verbesserung der Verstreckbarkeit des Garns werden zusätzlich Wärmequellen in Form von Kontaktheizern zwischen den Streckrollen vorgesehen. Es ist bekannt, dass beim Schmelzspinnprozess, bei einer AufWickelgeschwindigkeit von 4500 m/min und darüber, die Aufwickelspannung so erhöht ist, dass eine Papierspule der Spulmaschine nicht mehr entnommen werden kann. Das Problem wird bei diesem Verfahren durch Relaxieren um etwa 10 % gelöst. Für From DE-A-34 37 943 a process for the production of polyamide 66 filament yarn is known, in which an undrawn yarn made of polyhexamethylene adipamide, with a relative viscosity in formic acid from 60 to 100, is drawn in one or two stages. The device suitable for this purpose consists of several heated stretching roller units. To improve the stretchability of the yarn, additional heat sources in the form of contact heaters are provided between the stretching rollers. It is known that in the melt spinning process, at a winding speed of 4500 m / min and above, the winding tension is increased so that a paper spool can no longer be removed from the winding machine. The problem is solved in this method by relaxing about 10%. For
Aufspulen des verstreckten Garns werden keine Angaben gemacht . Die bekannten Garne werden bei Geschwindigkeiten von maximal 20 m/min aufgespult. Ziel des bekannten Verfahrens ist die Herstellung von sogenannten dimensionsstabilen Filamentgarnen für Reifenkordgewebe, mit hoher Festigkeit, hoher Dehnung und einem niedrigem Schrumpf, möglichst unter 5 %. Für diese Garne sind die Streckbedingungen und insbesondere die Aufspulbedingungen auf Kreuzspulen optimiert . Neuerdings werden aber, speziell für den Einsatz inNo information is given on winding the drawn yarn. The known yarns are wound up at a maximum speed of 20 m / min. The aim of the known method is to produce what are known as dimensionally stable filament yarns for tire cord fabric, with high strength, high elongation and low shrinkage, if possible below 5%. The stretching conditions and in particular the winding conditions on cross-wound bobbins are optimized for these yarns. Recently, however, specifically for use in
Airbaggeweben, vermehrt auch Garne mit hohemAirbag fabrics, increasingly also yarns with high
Thermoschrumpf verwendet. Derartige Garntypen lassen sich zwar unschwer erzeugen, jedoch lassen sie sich nicht ohne Probleme auf Kreuzspulen aufwickeln.Thermoshrink used. It is not difficult to produce such types of yarn, but they cannot be wound on packages without problems.
Aufgabe der Erfindung ist es, ein Verfahren zum direkten Aufspulen von hochfesten Synthesefäden im Anschluss an den Heissverstreckungsprozess, direkt auf Kreuzspulen, zur Verfügung zu stellen.The object of the invention is to provide a method for the direct winding of high-strength synthetic threads following the hot stretching process, directly on packages.
Eine weitere Aufgabe ist es, ein hochfestes Polyamid-66- Filamentgarn mit hohem Schrumpf herzustellen und auf einer Kreuzspule bereitzustellen.Another object is to produce a high tenacity, high shrink polyamide 66 filament yarn and provide it on a package.
Eine weitere Aufgabe ist es, sowohl dieAnother job is to do both
Produktionsgeschwin-digkeit als auch das Einheitsgewicht der Garnträger und somit die Wirtschaftlichkeit des Streck- und Spulverfahrens zu steigern. Einrichtungen zur Erzeugung von zylindrischen Kreuzspulen ermöglichen Produktionsgeschwindigkeiten von mehreren Tausend Metern pro Minute.Production speed as well as the unit weight of the yarn carriers and thus to increase the economy of the stretching and winding process. Devices for the production of cylindrical cross-wound bobbins enable production speeds of several thousand meters per minute.
Die Aufgabe wird erfindungsgemäss dadurch gelöst, dass bei einem Relaxationsverhältnis von 4 bis 10%, die Temperatur des letzten Streckrollenaggregats vor der Aufwicklung zwischen 70°C und 160°C, insbesondere 80°C und 150°C, bevorzugt auf 90°C - 140°C und die Spulspannung auf weniger als 0,2 cN/tex, insbesondere auf weniger als 0,15 cN/tex, bevorzugt weniger als 0,13 cN/tex eingestellt werden.The object is achieved according to the invention in that, at a relaxation ratio of 4 to 10%, the temperature of the last stretching roller unit before winding up is between 70 ° C. and 160 ° C., in particular 80 ° C. and 150 ° C., preferably to 90 ° C.-140 ° ° C and the winding tension to less than 0.2 cN / tex, in particular to less than 0.15 cN / tex, preferably less than 0.13 cN / tex.
Die Fadenspannung im Aufspulbereich wird im wesentlichen durch das Relaxationsverhältnis, d.h. durch das Verhältnis der Geschwindigkeiten der letztenThe thread tension in the winding area is essentially determined by the relaxation ratio, i.e. by the ratio of the speeds of the last
Streckgalette und der Aufspuleinrichtung bestimmt. Es ist zweckmässig, das Relaxationsverhältnis zwischen 4 und 10% zu wählen.Stretch godet and the winding device determined. It is expedient to choose the relaxation ratio between 4 and 10%.
Bei einer Temperatur der letzten Streckgalette von weniger als 70°C ist ein einwandfreier Spulenaufbau praktisch nicht möglich Bej_ einer Temperatur von über 160°C wird die Fadenspannung im Aufspulbereich so hoch, dass ebenfalls keine einwandfreien Kreuzspulen hergestellt werden können, oder aber der Thermoschrumpf wird durch Absenkung der Fadenspannung so tief, dass kein hochschrumpfendes Garn mehr erhalten werden kann.At a temperature of the last stretch godet of less than 70 ° C, a perfect bobbin build is practically not possible.B e j_ at a temperature of over 160 ° C, the thread tension in the winding area is so high that no perfect cross-wound bobbins can be produced, or the thermal shrink becomes so deep by lowering the thread tension that no more shrinking yarn can be obtained.
Für einen akzeptablen Spulenaufbau einer zylindrischen Kreuzspule ist nur ein schmaler Bereich der Fadenspannung zulässig. Bei einer Spulspannung grösser als 0,2 cN/tex ist ein akzeptabler Spulenaufbau nicht mehr möglich. Die Kreuzspulen bilden an den Seitenkanten hohe Wülste, die durch die antreibende Walze flachgepresst werden. Als Folge davon werden die Flanken der Spulen nach aussen gedrückt, so dass sie schliesslich die Flanken der Garnträger überragen. Solche Spulen lassen sich nicht nur nicht ordentlich verpacken und versenden, sie ergeben auch bedeutende Schwierigkeiten beim nachfolgenden Abarbeiten des Garns, wobei häufig Fadenbrüche auftreten. Wird im umgekehrten Falle die Spulspannung zu gering gewählt, z.B. kleiner als 0.05 cN/dtex, dann wird das Garnpaket sehr weich. Es hat nicht genügend inneren Zusammenhalt, so dass es sich auch nicht gut versenden und abarbeiten lässt.For an acceptable package build of a cylindrical package, only a narrow range of thread tension is allowed. At a winding tension greater than 0.2 cN / tex st i e i n acceptable package build no longer possible as. The cross-wound bobbins form high beads on the side edges, which are pressed flat by the driving roller. As a result, the flanks of the bobbins are pressed outwards so that they finally protrude over the flanks of the yarn carriers. Such bobbins not only cannot be properly packaged and shipped, they also pose significant difficulties in the subsequent processing of the yarn, with thread breaks frequently occurring. Conversely, if the bobbin tension is chosen too low, for example less than 0.05 cN / dtex, the yarn package becomes very soft. It does not have enough internal cohesion, so it is not easy to send and work through.
Da Spulmaschinen zur Herstellung von zylindrischenSince winding machines for the production of cylindrical
Kreuzspulen im Gegensatz zur herkömmlichen Copsaufwicklung Geschwindigkeiten von mehreren Tausend Metern pro Minute ermöglichen, ist es zweckmässig und wirtschaftlich, das Verstrecken in einen Spinnstreckprozess zu integrieren. Das Polyamid-66-Filamentgarn weist bei einer relativenIn contrast to conventional cops rewinds, if cross-wound packages allow speeds of several thousand meters per minute, it is expedient and economical to integrate the stretching in a spin-stretching process. The polyamide 66 filament yarn shows a relative
Viskosität (RV) von > 40, gemessen in 90 %-igerViscosity (RV) of> 40, measured in 90%
Ameisensäure gemäss ASTM 0789-81, eine Festigkeit von wenigsten 60 cN/tex, einer Dehnung von 10-25 % und einen Thermoschrumpf von 7-11 % bei 160°C auf und ist zu einerFormic acid according to ASTM 0789-81, a strength of at least 60 cN / tex, an elongation of 10-25% and a thermal shrinkage of 7-11% at 160 ° C and is one
Kreuzspule mit wenigsten 6 kg Fadenmasse aufgewickelt. Es ist überraschend gelungen, ein so hochschrumpfendesCross-wound bobbin with at least 6 kg thread mass. It has succeeded surprisingly, such a shrinking one
Polyamidgarn zu 6 kg-Spulen anstelle der unwirtschaftlichen Copse mit nur maximal 4 kg Fassungsvermögen aufzuwickeln.Instead of the uneconomical copse, wind up the polyamide yarn into 6 kg bobbins with a maximum capacity of 4 kg.
Das erfindungsgemässe Polyamid-66-Filamentgarn ist für industrielle Gewebe, insbesondere für Airbaggewebe geeignet, welche ausser einer hohen Festigkeit auch noch einen besonders hohen Thermoschrumpf aufweisen sollen.The polyamide 66 filament yarn according to the invention is suitable for industrial fabrics, in particular for airbag fabrics, which, in addition to being very strong, should also have particularly high thermal shrinkage.
Das erfindungsgemässe Verfahren soll anhand einer Verfahrensskizze näher beschrieben werden. Es zeigen:The process according to the invention is to be described in more detail with the aid of a process sketch. Show it:
Fig. 1 schematisch das erfindungsgemässe VerfahrenFig. 1 shows schematically the inventive method
Fig. 2 schematisch eine Variante des erfindungsgemässen Verfahrens,2 schematically shows a variant of the method according to the invention,
In Fig. 1 ist mit dem Bezugszeichen 1 ein unverstrecktes Polyamid-66-LOY Filament bezeichnet. Das Filament wird von einer nicht gezeigten Lieferwalze einem ersten beheizten Streckrollenaggregat 2 zugeführt. Zwischen der Lieferwalze und dem ersten Streckrollenaggregat 2 wird das unverstreckte Filament 1 um ca. 3% leicht verdehnt, um dem Filament 1 eine minimale Spannung zu erteilen. Die Fadenspannung muss so gewählt sein, dass ein ausreichender Kraftschluss zwischen dem Filament 1 und der Oberfläche des Streckrollenaggregats 2 gewährleistet ist, um der in der ersten Streckstufe auftretenden Streckkraft den erforderlichen Widerstand zu leisten. Zwischen einem zweiten auf etwa 180°C beheizten Streckrollenaggregat 3 und dem ersten Streck¬ rollenaggregat 2 findet eine erste Verstreckung statt . Ein drittes Streckrollenaggregat 4 mit einer Oberflächentemperatur von 70°C bis 150°C ist dem beheizten Streckrollenaggregat 3 nachgeschaltet und bewirkt eine weitere zweite Verstreckung.In Fig. 1, an undrawn polyamide 66-LOY filament is designated by the reference numeral 1. The filament is fed from a delivery roller (not shown) to a first heated draw roll unit 2. The undrawn filament 1 is slightly stretched by approximately 3% between the delivery roller and the first stretching roller unit 2 in order to impart a minimal tension to the filament 1. The thread tension must be selected so that a sufficient frictional connection between the filament 1 and the surface of the drawing roller unit 2 is ensured in order to provide the necessary resistance to the drawing force occurring in the first drawing step. Between a second heated to about 180 ° C The stretching roller assembly 3 and the first stretching roller assembly 2 are subjected to a first stretching. A third stretching roller unit 4 with a surface temperature of 70 ° C to 150 ° C is connected downstream of the heated stretching roller unit 3 and causes a further second stretching.
Nach der Verstreckung wird das verstreckte Filament 5 auf eine Kreuzspule 6 aufgewickelt. Zur Erniedrigung der Fadenspannung wird das Filament mit einer Geschwindigkeit aufgespult, welche um etwa 6% niedriger eingestellt ist als die Geschwindigkeit des Aggregats 4. Die Spulspannung wird dadurch auf beispielsweise 0,13 cN/dtex eingestellt. Alle Streckrollenaggregate werden von dem Filament 1 mehrfach umschlungen, um einerseits den erforderlichen Kraftschluss für die Verstreckung sicherzustellen und um andererseits einen ausreichenden Wärmeaustausch zwischen den beheizten Rollenoberflächen und dem Filament 1 zu gewährleisten.After drawing, the drawn filament 5 is wound onto a cheese 6. To lower the thread tension, the filament is wound up at a speed which is set about 6% lower than the speed of the unit 4. The winding tension is thereby set to, for example, 0.13 cN / dtex. All stretching roller units are wrapped several times by the filament 1, on the one hand to ensure the required frictional connection for drawing and on the other hand to ensure sufficient heat exchange between the heated roll surfaces and the filament 1.
Fig. 2 unterscheidet sich von Fig. 1 durch ein zusätzliches Streckrollenaggregat 7. Beim Verfahren nach dieser Variante wird das Streckrollenaggregat 7 beispielsweise auf eine Temperatur von 180°C beheizt. In diesem Fall wird die zweite Verstreckung zwischen den Streckrollenaggregaten 3 und 7 durchgeführt, während die Temperatur des Streckrollenaggregats 4. gegenüber der Anordnung in Fig. 1 nicht verändert wird. Die Geschwindigkeit des Streckrollenaggregats 4 ist dabei mindestens so hoch wie diejenige des Streckrollenaggregats 7.FIG. 2 differs from FIG. 1 by an additional stretching roller unit 7. In the method according to this variant, the stretching roller unit 7 is heated, for example, to a temperature of 180.degree. In this case, the second stretching is carried out between the stretching roller units 3 and 7, while the temperature of the stretching roller unit 4 is not changed compared to the arrangement in FIG. 1. The speed of the stretching roller assembly 4 is at least as high as that of the stretching roller assembly 7.
Die Vorrichtung gemäss Figur 1 ist exemplarisch und nicht ausschliesslich zur Durchführung des Verfahrens geeignet. Eine für das Verfahren geeignete Vorrichtung kann anstelle der Streckrollenaggregate mit Separierrollen auch aus Galettenduos bestehen. Ferner können zwischen den Aggregaten weitere Elemente zur thermischenThe device according to FIG. 1 is exemplary and not exclusively suitable for carrying out the method. A device suitable for the process can also consist of godet duos instead of the stretching roller units with separating rollers. Furthermore, between the units further elements for thermal
Behandlung des Garns wie Block- oder Strahlungsheizer, Heissluft- oder Dampfdüsen, angeordnet sein. Ferner ist es zweckmässig, das aufzuspulende Garn mittels einer Luftdüse oder ähnlichem zu verwirbeln, um dadurch die Weiterverarbeitbarkeit zu verbessern.Treatment of the yarn such as block or radiant heaters, hot air or steam nozzles can be arranged. Furthermore, it is expedient to swirl the yarn to be wound up by means of an air nozzle or the like, in order thereby to improve the further processability.
Diese Vorrichtung ist auch nicht für nur einen Filamentfaden geeignet, bei feineren Garnen, beispielsweise bei einem Titer von 470 dtex oder weniger, können auch zwei oder mehr Filamentfaden gleichzeitig verstreckt und auf einer entsprechend mehrendigen Aufspuleinheit aufgespult werden.This device is also not suitable for only one filament thread, in the case of finer yarns, for example with a titer of 470 dtex or less, two or more filament threads can also be drawn at the same time and wound on a corresponding multi-ended winding unit.
Die Arbeitsgeschwindigkeit dieser Vorrichtung liegt im Bereich zwischen 300 und 3 ' 000 m/min. Sie ist somit wesentlich produktiver als herkömmliche Streckzwirn¬ maschinen, die den Faden auf CoPΞ ablegen. Ferner können Kreuzspulen mit einer Fadenmasse von mehr als 10 kg hergestellt werden. Gegenüber der Copsaufmachung mit maximal 4 kg sind hierbei wesentlich weniger Manipulationen erforderlich. Die hohe Arbeits¬ geschwindigkeit schränkt die Einsatzfähigkeit auch nicht auf das Verstrecken von bereits aufgespultem LOY- Filamentgarne ein. Sie ist prinzipiell auch für den Einsatz in einem integrierten Spinn-Streck-Verfahren geeignet.The operating speed of this device is in the range between 300 and 3,000 m / min. It is therefore much more productive than conventional draw twisting machines which deposit the thread on Co P Ξ . Cross-wound bobbins with a thread mass of more than 10 kg can also be produced. Compared to the presentation of the cops with a maximum of 4 kg, far fewer manipulations are required. The high working speed does not limit the usability to the stretching of already wound LOY filament yarns. In principle, it is also suitable for use in an integrated spin-stretch process.
Üblicherweise werden hochfeste Garne mit niedrigem Thermoschrumpf vor dem Aufspulen relaxiert. Dies geschieht im allgemeinen durch den Einsatz eines zusätzlichen Galettenaggregates, welches um einen definierten Betrag langsamer läuft als das letzte Streckrollenaggregat. Es ist aber auch möglich, die Fadenverkürzung unmittelbar innerhalb des Aufspulbereichs dadurch vorzunehmen, dass die Aufspulung mιt einer geringeren Geschwindigkeit vorgenommen wird als derjenigen der letzten Streckgalette.Usually, high-strength yarns with low thermal shrinkage are relaxed before winding. This is generally done by using an additional godet unit, which runs slower than the last stretching roller unit by a defined amount. However, it is also possible to perform the yarn shortening immediately inside the Aufspulbereichs characterized in that the spooling mιt e i ner lower speed than that of the last stretch godet.
Zur Erzeugung eines hochschrumpfenden Garns muss im Gegensatz zur herkömmlichen Technik die Relaxation des Garns möglichst unterbunden werden. Es wird also die Aufgabe gestellt, einen Prozess bereitzustellen, der ein möglichst unrelaxiertes Garn aufspult. Theoretisch lässt sich das dadurch bewerkstelligen, dass man die Geschwindigkeit der Aufspuleinheit gleich oder nur geringfügig langsamer einstellt als die des letzten Galettenaggregats . Das hat aber sehr hohe Fadenspannungen zur Folge, unter denen der Aufbau einer Kreuzspule im allgemeinen nicht möglich ist.In contrast to conventional technology, the relaxation of the yarn must be prevented as far as possible to create a shrinking yarn. The task is therefore to provide a process that winds up a yarn that is as unrelaxed as possible. Theoretically, this can be done by setting the speed of the winding unit to be the same or only slightly slower than that of the last godet unit. However, this results in very high thread tensions, under which the construction of a package is generally not possible.
Das Verfahren ist weiter anhand der nachfolgenden Beispiele erläutert .The process is further explained using the examples below.
Beispiel 1 (Vergleich)Example 1 (comparison)
Ein LOY-Filamentgarn aus Polyamid 66 mit einer relativen Viskosität (RV) in Ameisensäure von 45 und einem Spinntiter von 1'270 dtex wurde zweifädig über die Vorrichtung gemäss Figur 1 geführt . Das Filamentgarn wurde unter den in Tabelle 1 angegebenen Bedingungen zweistufig im Verhältnis 5.3 : 1 auf den Titer 235 dtex verstreckt und innerhalb der Spulzone, d.h. zwischen dem Streckrollenaggregat 4 und der Kreuzspule 5 um 6.8 % relaxiert. Die Temperatur der letzten Streckaggregats betrug 230°C. Das erhaltene Filamentgarn wies eine Festigkeit von 74.5 cN/dtex bei einer Bruchdehnung von 22 % und einen Thermoschrumpf bei 160°C von 3.6 % auf. Es ist jedoch für spezielle Einsätze, z.B. für den Bereich Airbaggewebe wegen des niedrigen Thermoschrumpfes nicht geeignet. Beispiel 2 (Vergleich)A LOY filament yarn made of polyamide 66 with a relative viscosity (RV) in formic acid of 45 and a spin titer of 1,270 dtex was passed over the device according to FIG. 1 in two threads. The filament yarn was drawn in two stages in a ratio of 5.3: 1 to the titer 235 dtex under the conditions given in Table 1 and relaxed by 6.8% within the winding zone, ie between the drawing roller unit 4 and the package 5. The temperature of the last stretching unit was 230 ° C. The filament yarn obtained had a strength of 74.5 cN / dtex with an elongation at break of 22% and a thermal shrinkage at 160 ° C of 3.6%. However, it is not suitable for special applications, for example in the area of airbag fabrics, because of the low thermal shrinkage. Example 2 (comparison)
Ein LOY-Filamentgarn aus Polyamid 66 mit einer relativen Viskosität (RV) in Ameisensäure von 45 und mit einem für Airbaggewebe geeigneten hohen Thermoschrumpf wurde unter den im wesentlichen gleichen Streckbedingungen wie in Beispiel 1 dadurch erzielt, dass die Temperatur der letzten Streckgalette auf 160°C erniedrigt wurde. Das Relaxationsverhältnis wurde gegenüber Beispiel 1 unwesentlich auf 5.7 % erniedrigt. Das erhaltene Garn wies eine Festigkeit von 72 cN/tex bei einer Bruchdehnung von 16.6 % und einen Thermoschrumpf bei 160°C von 9.2 % auf.A LOY filament yarn made of polyamide 66 with a relative viscosity (RV) in formic acid of 45 and with a high thermal shrinkage suitable for airbag fabrics was achieved under the essentially same stretching conditions as in Example 1 by raising the temperature of the last stretch godet to 160 ° C was lowered. The relaxation ratio was insignificantly reduced to 5.7% compared to Example 1. The yarn obtained had a strength of 72 cN / tex with an elongation at break of 16.6% and a thermal shrinkage at 160 ° C of 9.2%.
Der untragbare Nachteil dieses Verfahrens lag jedoch darin, dass durch die Erniedrigung der Temperatur der letzten Streckgalette die Fadenspannung im Aufspulbereich mit 0.38 cN/dtex so hoch war, dass keine akzeptable Spulen aufgebaut werden konnten. Bereits nach 1.5 kg Fadenauflage waren die Spulen so stark deformiert und an den Flanken ausgebaucht, dass sie die als Träger dienenden Garnhülsen beidseitig überragten. Eine solche Spule ist sowohl für den Versand als auch für die Abarbeitung, z.B. in einer Weberei ungeeignet.The intolerable disadvantage of this method, however, was that, due to the lowering of the temperature of the last stretch godet, the thread tension in the winding area was so high at 0.38 cN / dtex that no acceptable bobbins could be built up. After just 1.5 kg of thread support, the bobbins were deformed to such an extent and bulged on the flanks that they protruded on both sides of the yarn tubes serving as carriers. Such a spool is used both for shipping and for processing, e.g. unsuitable in a weaving mill.
Beispiel 3 (erfindungsgemäss)Example 3
Ein LOY-Filamentgarn aus Polyamid 66 mit einer relativen Viskosität (RV) in Ameisensäure von 45 mit einem für Airbag-Gewebe geeigneten hohen Thermoschrumpf wurde unter den im wesentlichen gleichen Streckbedingungen wie in Beispiel 1 dadurch erzielt, dass die Temperatur der letzten Streckgalette auf 105°C erniedrigt wurde. Das Relaxationsverhältnis wurde gegenüber Beispiel 1 unwesentlich auf 6.5 % erniedrigt. Das erhaltene Garn wies eine Festigkeit von 74.2 cN/tex bei einer Bruchdehnung von 17.4 % und einen Thermoschrumpf bei 160°C von 9.0 % auf. Die Fadenspannung im Aufspulbereich belief sich bei dieser Einstellung überraschend auf nur 0.13 cN/dtex wie in Beispiel 1. Auf diese Weise konnten ohne Probleme Kreuzspulen mit 7.5 kg Fadenauflage hergestellt werden. Der Aspekt dieser Spulen war gut: die Flanken waren gerade und am Spulenumfang war keine Schulterbildung zu beobachten.A LOY filament yarn made of polyamide 66 with a relative viscosity (RV) in formic acid of 45 with a high thermal shrinkage suitable for airbag fabrics was achieved under the essentially same stretching conditions as in Example 1 by raising the temperature of the last stretch godet to 105 ° C was lowered. The relaxation ratio was insignificantly reduced to 6.5% compared to Example 1. The yarn obtained had a tenacity of 74.2 cN / tex with an elongation at break of 17.4% and a thermal shrinkage 160 ° C from 9.0%. With this setting, the thread tension in the winding area was surprisingly only 0.13 cN / dtex as in Example 1. In this way, cross-wound bobbins with 7.5 kg of thread support could be produced without problems. The aspect of these coils was good: the flanks were straight and no shoulder formation was observed on the coil circumference.
Beispiel 4 (erfindungsgemäss)Example 4
Zwei PA 66-Filamentgarne des Ausgangstiters 2' 540 dtex wurden wie in Beispiel 3 gemeinsam zweistufig mit einem Streckverhältnis 5.4 verstreckt. Die Temperatur des Streckrollenaggregats 4 wurde auf 90°C abgesenkt. Bei einem Relaxationsverhältnis von 7.5 % wurde eine Fadenspannung im Aufspulbereich von 0.074 cN/dtex gemessen. Die Spulen enthielten eine Garnmasse von 10.3 kg und waren einwandfrei mit geraden Flanken und ohne Schulterbildung am Umfang. Der verstreckte Faden wies die in Tabelle 1 angegebenen Eigenschaften auf.Two PA 66 filament yarns with an initial titer of 2'540 dtex were drawn together in two stages with a draw ratio 5.4 as in Example 3. The temperature of the stretching roller assembly 4 was lowered to 90 ° C. With a relaxation ratio of 7.5%, a thread tension in the winding area of 0.074 cN / dtex was measured. The bobbins contained a yarn mass of 10.3 kg and were perfect with straight flanks and no shoulder formation on the circumference. The drawn thread had the properties shown in Table 1.
Die folgende Tabelle 1 zeigt die Prozessparameter nach dem erfindungsgemässen Verfahren, wobei auf einer Streckmaschine mit drei beheizten Streckrollenaggregaten, Galetten mit Separierrolle in zwei Stufen bei 800 m/min Endgeschwindigkeit auf das 5,4-fache seiner Ausgangslänge verstreckt wurde. In der gleichen Tabelle sind die Fadeneigenschaften angegeben. The following Table 1 shows the process parameters according to the method according to the invention, with stretching on a stretching machine with three heated stretching roller units, godets with separating roller in two stages at 800 m / min final speed to 5.4 times its original length. The thread properties are given in the same table.
Tabelle 1Table 1
Die erfindungsgemässe Vorrichtung besitzt gegenüber den bekannten Vorrichtungen zwei wesentliche Vorteile. Es können einerseits zwei oder mehr Fäden gleichzeitig verstreckt und aufgespult werden und andererseits kann die Produktionsgeschwindigkeit wegen der leistungsfähigeren Aufspulung auf Kreuzspulen gegenüber dem herkömmlichen Streckzwirnen gesteigert werden. Das erfindungsgemässe Garn ist besonders zur Herstellung von Airbaggeweben geeignet . The device according to the invention has two essential advantages over the known devices. On the one hand, two or more threads can be drawn and wound up at the same time, and on the other hand, the production speed can be increased compared to conventional drawing twists because of the more efficient winding on cross-wound bobbins. The yarn according to the invention is particularly suitable for the production of airbag fabrics.

Claims

Patentansprüche claims
1. Verfahren zur Herstellung eines hochfesten, hochschrumpfenden Polyamid-66-Filamentgarns für industrielle Gewebe, insbesondere für Airbaggewebe, durch mehrstufiges Verstrecken von Polyamid-66-LOY Filament (1) , mit einer relativen Viskosität zwischen1. A process for producing a high-strength, high-shrinkage polyamide 66 filament yarn for industrial fabrics, in particular for airbag fabrics, by multi-stage drawing of polyamide 66 LOY filament (1), with a relative viscosity between
RV von wenigstens 40, mittels wenigstens drei beheizbaren Streckrollenaggregaten (2,3,4) und/oderRV of at least 40, by means of at least three heatable stretching roller units (2, 3, 4) and / or
(2,(2,
3,4,7) und unmittelbaren Aufspulen des verstreckten Garns (5) auf einen zylindrischen Garnträger (6) , dadurch gekennzeichnet, dass bei einem Relaxationsverhältnis von 4 bis 10 %, die Temperatur des letzten Streckrollenaggregates (4) vor der Aufwicklung zwischen 70°C und 160°C und die Spulspannung auf weniger als 0,2 cN/tex eingestellt werden.3, 4, 7) and direct winding of the drawn yarn (5) onto a cylindrical yarn carrier (6), characterized in that with a relaxation ratio of 4 to 10%, the temperature of the last drawing roller unit (4) before winding up between 70 ° C and 160 ° C and the winding tension to less than 0.2 cN / tex.
Verfahren nach den Anspruch 1, dadurch gekennzeichnet, dass das Verstrecken integraler Bestandteil eines Spinn-Streckprozesses ist.A method according to claim 1, characterized in that the drawing is an integral part of a spin-drawing process.
Verfahren nach den Ansprüchen 1 bis 2, dadurch gekennzeichnet, dass eine Kreuzspule mit wenigstens 6 kg Garn bewickelt wird.Method according to claims 1 to 2, characterized in that a cheese is wound with at least 6 kg of yarn.
4. Polyamid-66-Filamentgarn für industrielle Gewebe, dadurch gekennzeichnet, dass das Polyamid-66- Filamentgarn eine Festigkeit von wenigsten 60 cN/tex, eine Dehnung von 10 bis 25 % und einen Thermoschrumpf von 7-11 % (160°C) aufweist und mit wenigsten 6 kg Auflage auf einer Spulenhülse (Kreuzspule) aufgewickelt ist. 4. Polyamide 66 filament yarn for industrial fabrics, characterized in that the polyamide 66 filament yarn has a tenacity of at least 60 cN / tex, an elongation of 10 to 25% and a thermal shrinkage of 7-11% (160 ° C) has and is wound with at least 6 kg overlay on a bobbin (cheese).
EP96926310A 1995-08-24 1996-08-20 Process for producing a high-strength, high-shrinkage polyamide 66 filament yarn Expired - Lifetime EP0846197B1 (en)

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PCT/CH1996/000288 WO1997008371A1 (en) 1995-08-24 1996-08-20 Process for producing a high-strength, high-shrinkage polyamide 66 filament yarn

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