EP0287604B1 - Process for manufacturing a smooth polyester yarn and polyester yarn manufactured by this process - Google Patents

Process for manufacturing a smooth polyester yarn and polyester yarn manufactured by this process Download PDF

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Publication number
EP0287604B1
EP0287604B1 EP87906653A EP87906653A EP0287604B1 EP 0287604 B1 EP0287604 B1 EP 0287604B1 EP 87906653 A EP87906653 A EP 87906653A EP 87906653 A EP87906653 A EP 87906653A EP 0287604 B1 EP0287604 B1 EP 0287604B1
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European Patent Office
Prior art keywords
thread
polyester
polyester yarn
poy
yarn
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EP87906653A
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German (de)
French (fr)
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EP0287604B2 (en
EP0287604A1 (en
Inventor
Hugo Specker
Paul Schaffner
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Viscosuisse SA
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Rhone Poulenc Viscosuisse SA
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    • 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
    • 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
    • D01D5/12—Stretch-spinning methods
    • D01D5/16—Stretch-spinning methods using rollers, or like mechanical devices, e.g. snubbing pins
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
    • D01F6/62—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyesters
    • 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

Definitions

  • the present invention relates to a method for producing a smooth, cold-drawn, multifilament filament thread made of polyester POY and a thread produced by this method.
  • a smooth multifilament filament thread is to be understood as a non-textured filament thread, which retains its uncurled flat shape even after boiling in water.
  • Polyester is to be understood as a thermoplastic which was produced from at least 85% by weight of terephthalic acid and ethylene glycol.
  • the polyester POY Partially Oriented Yarn
  • a polyester thread with a titer of about 50 to 1200 dtex which was melt spun at a speed of about 2800 to 4000 m / min.
  • cold stretching we mean stretching at thread temperatures that are significantly below the glass transition temperature of the polyester, i.e. significantly below 85 ° C.
  • the delivery roll can be unheated for stretching or have a temperature of up to 70 ° C.
  • the drawing can be carried out with or without the use of a drawing pin.
  • Homogeneous cold drawing should be understood to mean that the draw ratio must be chosen so high that there are no undrawn or less than the set draw ratio in the drawn thread, which e.g. can be recognized by the Uster%, which should generally be ⁇ 1.5. For POY from the specified speed range, this means that the draw ratio must be at least 1.6, depending on the spinning speed.
  • DE-A-28 39 672 discloses a polyester exchange thread for cellulose acetate of the type with a boil-off shrinkage of 2 to 6% by direct rapid spinning at about 4000 m / min, without using a drafting system and without heat treatment. A boil-off shrinkage of less than 2% is described as extremely low and difficult to achieve directly.
  • the known thread has the disadvantage that it still has too high a shrinkage.
  • such a thread must be shrunk before the bobbin dyeing and rewound onto perforated dye tubes.
  • the object of the invention is to provide a method with which a thread can be produced which has an extremely low shrinkage and comes close to a cellulose acetate or viscose thread in its other properties.
  • the object is achieved according to the invention by the feature of claim 1 and is characterized in that the polyester POY is homogeneously cold-drawn in a first process step with a draw ratio of at least 1.6 and in a second process step is hot-relaxed with an advance of 10 to 20% .
  • the resulting thread is excellently suitable as a replacement material for cellulose acetate in smooth fabrics and shows a good suitability for roughening.
  • the thread will shrink too much; with a lead of more than about 20%, a crimp occurs, which is undesirable for the area of application of a smooth thread.
  • the thread produced by the method according to the invention is characterized by its strength-elongation diagram.
  • the reproduction of the complete strength-elongation diagram has good information about the mechanical behavior of the examined thread.
  • the key figures of the initial module
  • the reversibility limit, tensile strength and elongation at break are determined from these in a known manner, for example the initial module from the linear slope at the beginning of the diagram, the reversibility limit corresponding to the strength from which the diagram deviates from the linear course.
  • the thread according to the invention must simultaneously meet the following conditions: it must have an initial modulus of 200 to 800 cN / tex, in particular 350 to 500 cN / tex; a reversibility limit of 4 to 12 cN / tex, in particular 6 to 12 cN / tex; a boil-off shrinkage of 0 to 2.8%, in particular 0 to 2%; an intrinsic viscosity of 0.60 to 0.75 di / g, in particular 0.62 to 0.66 dl / g, measured at 25 ° C in a mixture of phenol tetrachloroethane 1: 1; thermal shrinkage at 160 ° C and 0.1 cN / tex pretensioning force of ⁇ 2%; have a shrinkage force of 0.1 cN / tex measured under the same temperature and preload conditions.
  • the largely shrunk thread has the advantage that it can be twisted directly onto a perforated dye tube in the event of bobbin dyeing without steaming and rewinding.
  • a polyester POY according to the preamble of claim 1 with an intrinsic viscosity of 0.62 di / g serves as the starting material for both examples.
  • the processing thread tension in the 2nd stage results from the process-related relaxation tension.
  • the swirling takes place at approx. 25 knots / meter and the winding at 420 m / min.
  • a polyester POY dtex 100 f 36 spun at 3100 m / min is drawn at a take-off speed of 530 mlmin and a ratio of 1: 1.8 without a drawing pin at room temperature and swirled at about 15 knots / meter immediately after the drawing zone.
  • the thread is fed through a closed radiation heater of 70 cm length at a heater temperature of 225 ° C with 20% advance.
  • the processing thread tension corresponds to the process-related relaxation tension.
  • the withdrawal speed is 110 mlmin.
  • polyester threads according to the invention are represented by their characteristic curves in FIGS. 2-4.
  • the curves obtained from the continuous and discontinuous production process are practically identical.
  • the reference numeral 1 denotes a first delivery plant 1.
  • the delivery unit 1 is followed by a second delivery unit 2 with a separating roller 2 '.
  • a heater 3 is arranged between the delivery unit 2 and a take-off unit 4 with a separating roller 4 ', which is followed by a winding unit.
  • An undrawn polyester POY 5a is taken up by the delivery unit 1 and is cold-drawn by the delivery unit 2 in a stretching zone 5b.
  • the take-off unit 4 runs at a lower speed than the delivery unit 2, as a result of which the drawn thread passes through the heater 3 with an adjustable advance in a relaxation zone 5c. The result is a heat-relaxed thread with the properties according to the invention.
  • the thread according to the invention is suitable for woven goods, knitted goods and especially for pile goods such as velvet, velor etc.
  • the improved tactile properties are very similar to those of cellulose acetate and viscose.

Abstract

Process for manufacturing a continuous smooth polyester yarn of low shrinkage, based on a rapidly spun partial oriented yarn (POY). The polyester POY (5a) is cold-drawn (5b) and then, together with a 10 to 20 % lead, is subjected to hot relaxation (5c) at a temperature of between 140 and 250°C in a dry medium or between 70 and 140°C in a wet medium, after which it is subjected to swirling as necessary. A yarn is obtained having an initial modulus of between 200 and 800 cN/tex and a scouring shrinkage of less than 3 %. The yarn is suitable for use as a substitute for cellulose acetate.

Description

Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung eines glatten, kaltverstreckten, multifilen Filamentfadens aus Polyester-POY sowie einen nach diesem Verfahren hergestellten Faden.The present invention relates to a method for producing a smooth, cold-drawn, multifilament filament thread made of polyester POY and a thread produced by this method.

Unter einem glatten multifilen Filamentfaden ist ein nicht texturierter Filamentfaden zu verstehen, welcher seine ungekräuselte flache Form auch nach dem Kochen in Wasser beibehält.A smooth multifilament filament thread is to be understood as a non-textured filament thread, which retains its uncurled flat shape even after boiling in water.

Unter Polyester ist ein thermoplastischer Kunststoff zu verstehen, welcher aus wenigstens 85 Gew.-% Terephthalsäure und Ethylenglykol hergestellt wurde.Polyester is to be understood as a thermoplastic which was produced from at least 85% by weight of terephthalic acid and ethylene glycol.

Das Polyester-POY (Partial Oriented Yarn) steht für einen Polyesterfaden, mit einem Titer von etwa 50 bis 1200 dtex, welcher bei einer Geschwindigkeit von etwa 2800 bis 4000 m/min schmelzgesponnen wurde.The polyester POY (Partially Oriented Yarn) stands for a polyester thread with a titer of about 50 to 1200 dtex, which was melt spun at a speed of about 2800 to 4000 m / min.

Mit Kaltverstrecken bezeichnen wir ein Verstrecken bei Fadentemperaturen, welche deutlich unterhalb der Glasumwandlungstemperatur des Polyesters, also deutlich unter 85°C liegen. Zum Beispiel kann die Lieferrolle zum Verstrecken ungeheizt sein oder eine Temperatur bis 70°C haben. Die Verstreckung kann mit oder ohne Verwendung eines Streckstiftes erfolgen.With cold stretching we mean stretching at thread temperatures that are significantly below the glass transition temperature of the polyester, i.e. significantly below 85 ° C. For example, the delivery roll can be unheated for stretching or have a temperature of up to 70 ° C. The drawing can be carried out with or without the use of a drawing pin.

Unter homogenem Kaltverstrecken soll verstanden werden, dass das Streckverhältnis so hoch gewählt werden muss, dass im verstreckten Faden keine unverstreckten oder weniger hoch als das eingestellte Streckverhältnis verstreckte Stellen vorhanden sein dürfen, was z.B. an den Uster % erkennbar ist, die im allgemeinen < 1,5 sein sollen. Für POY aus dem angegebenen Geschwindigkeitsbereich heisst dies, dass das Streckverhältnis je nach Spinngeschwindigkeit mindestens 1, 6 betragen muss.Homogeneous cold drawing should be understood to mean that the draw ratio must be chosen so high that there are no undrawn or less than the set draw ratio in the drawn thread, which e.g. can be recognized by the Uster%, which should generally be <1.5. For POY from the specified speed range, this means that the draw ratio must be at least 1.6, depending on the spinning speed.

Unter Heissrelaxation verstehen wir eine durch Temperaturbehandlung mit Temperaturen oberhalb der Glasumwandlungstemperatur ererwirkte Längenabnahme des Fadens. Der Betrag der Längenabnahme wird durch die sogenannte Voreilung VE bestimmt :

Figure imgb0001

  • VL = Geschwindigkeit des Lieferwerks
  • VA = Geschwindigkeit des Abzugwerks
By hot relaxation we mean a decrease in the length of the thread caused by temperature treatment at temperatures above the glass transition temperature. The amount of the decrease in length is determined by the so-called lead VE:
Figure imgb0001
  • V L = speed of the delivery plant
  • V A = speed of the fume cupboard

Die Herstellung von kaltgestrecktem Polyesterfaden aus mit mehr als 4000 m/min gesponnenem POY ist bekannt (JP-A-53-14 37 28).The production of cold-stretched polyester thread from POY spun at more than 4000 m / min is known (JP-A-53-14 37 28).

Aus der DE-A-28 39 672 ist ein Polyester-Austauschfaden für Celluloseacetat der Art mit einem Abkochschrumpf von 2 bis 6% durch direktes Schnellspinnen bei etwa 4000 m/min, ohne Verwendung eines Streckwerks und ohne Wärmebehandlung bekannt. Darin wird ein Abkochschrumpf kleiner als 2% als extrem niedrig und schwer direkt erzielbar bezeichnet.DE-A-28 39 672 discloses a polyester exchange thread for cellulose acetate of the type with a boil-off shrinkage of 2 to 6% by direct rapid spinning at about 4000 m / min, without using a drafting system and without heat treatment. A boil-off shrinkage of less than 2% is described as extremely low and difficult to achieve directly.

Der bekannte Faden hat vor allem den Nachteil, dass er noch einen zu hohen Schrumpf aufweist. Ausserdem muss ein solcher Faden vor der Spulenfärbung geschrumpft und auf perforierte Färbehülsen umgespult werden.The known thread has the disadvantage that it still has too high a shrinkage. In addition, such a thread must be shrunk before the bobbin dyeing and rewound onto perforated dye tubes.

Aufgabe der Erfindung ist es, ein Verfahren zu schaffen, mit welchem ein Faden hergestellt werden kann, der einen extrem niedrigen Schrumpf aufweist und dabei in seinen anderen Eigenschaften einem Celluloseacetat- oder Viscosefaden nahekommt.The object of the invention is to provide a method with which a thread can be produced which has an extremely low shrinkage and comes close to a cellulose acetate or viscose thread in its other properties.

Die Aufgabe wird erfindungsgemäss durch das Merkmal des Anspruchs 1 gelöst und ist dadurch gekennzeichnet, dass das Polyester-POY in einem ersten Verfahrensschritt mit einem Streckverhältnis von wenigstens 1, 6 homogen kaltverstreckt und in einem zweiten Verfahrensschritt mit einer Voreilung von 10 bis 20% heissrelaxiert wird.The object is achieved according to the invention by the feature of claim 1 and is characterized in that the polyester POY is homogeneously cold-drawn in a first process step with a draw ratio of at least 1.6 and in a second process step is hot-relaxed with an advance of 10 to 20% .

Im Bereich von 10 bis 20% Voreilung, bevorzugt 12 bis 18% Voreilung mit gleichzeitiger Wärmebehandlung wird überraschend ein praktisch schrumpffreier Faden erhalten, welcher ein fülliges, weiches, bei nicht mattiertem Polymer seidenglänzendes Flächengebilde mit gutem Fallvermögen liefert.In the range from 10 to 20% lead, preferably 12 to 18% lead with simultaneous heat treatment, a practically shrink-free thread is surprisingly obtained, which provides a plump, soft, silky glossy sheet material with good non-matting polymer with good falling properties.

Der resultierende Faden ist in hervorragender Weise als Austauschmaterial für Celluloseacetat in glatten Flächengebilden geeignet und zeigt eine gute Eignung zum Aufrauhen.The resulting thread is excellently suitable as a replacement material for cellulose acetate in smooth fabrics and shows a good suitability for roughening.

Bei einervoreilung von weniger als 10% resultiert ein Faden mit einem zu hohen Schrumpf ; bei einer Voreilung von mehr als etwa 20% tritt eine Kräuselung auf, welche fürdas Einsatzgebiet eines glatten Fadens unerwünscht ist.If the lead is less than 10%, the thread will shrink too much; with a lead of more than about 20%, a crimp occurs, which is undesirable for the area of application of a smooth thread.

Es istzweckmässig, die trockene Wärmebehandlung bei 140 bis 250°C, bevorzugt bei 200 bis 230°C, insbesondere bei 225°C bei einer Heizedänge von wenigstens 200 mm durchzuführen.It is expedient to carry out the dry heat treatment at 140 to 250 ° C., preferably at 200 to 230 ° C., in particular at 225 ° C. with a heating length of at least 200 mm.

Es ist jedoch auch möglich, die Wärmebehandlung in einer Flüssigkeit, vorteilhaft in WasserlWasserdampf, bei 70 bis 140°C durchzuführen.However, it is also possible to carry out the heat treatment in a liquid, advantageously in water / water vapor, at 70 to 140 ° C.

Es ist zweckmässig, die Relaxation bei einer Abzugsgeschwindigkeit von 100 bis 1000 mlmin, vorzugsweise bei 300 bis 700 m/min auszuführen.It is advisable to prefer relaxation at a withdrawal rate of 100 to 1000 mlmin to run at 300 to 700 m / min.

Der nach dem erfindungsgemässen Verfahren hergestellte Faden ist durch sein Festigkeits-Dehnungsdiagramm gekennzeichnet. Die Wiedergabe des vollständigen Festigkeit-Dehnungsdiagrammes hat eine gute Aussagekraft über das mechanische Verhalten des untersuchten Fadens. Darüber hinaus werden die Kennzahlen Anfangsmodul,The thread produced by the method according to the invention is characterized by its strength-elongation diagram. The reproduction of the complete strength-elongation diagram has good information about the mechanical behavior of the examined thread. In addition, the key figures of the initial module,

Reversibilitätsgrenze, Reissfestigkeit und Reissdehnung aus diesen in bekannter Weise bestimmt, beispielsweise der Anfangsmodul aus der linearen Steigung am Anfang des Diagramms, wobei die Reversibilitätsgrenze der Festigkeit entspricht, ab welcher das Diagramm vom linearen Verlauf abweicht.The reversibility limit, tensile strength and elongation at break are determined from these in a known manner, for example the initial module from the linear slope at the beginning of the diagram, the reversibility limit corresponding to the strength from which the diagram deviates from the linear course.

Ueblicherweise werden solche Fäden auch durch eine Reihe thermomechanischer Kennzahlen beschrieben, die auf die späteren Verarbeitungsbedingungen oder Gebrauchseigenschaften bezugnehmen. Darunter versteht man die bei definierten Temperautren und Vorspannkräften in Wasser oder Heissluft resultierenden Schrumpfungen (= Längenänderungen) oder Schrumpfkräfte (siehe Erläuterungen zu der Tabelle).Usually, such threads are also described by a series of thermomechanical key figures which refer to the later processing conditions or usage properties. This means the shrinkage (= changes in length) or shrinkage forces resulting from defined tempera tures and prestressing forces in water or hot air (see explanations to the table).

Der erfindungsgemässe Faden muss im einzelnen die folgenden Bedingungen gleichzeitig erfüllen : Er muss einen Anfangsmodul von 200 bis 800 cN/tex, insbesondere von 350 bis 500 cN/tex ; eine Reversibilitätsgrenze von 4 bis 12 cN/tex, insbesondere 6 bis 12 cN/tex ; einen Abkochschrumpf von 0 bis 2,8%, insbesondere 0 bis 2% ; eine intrinsische Viskosität von 0,60 bis 0,75 di/g, insbesondere 0,62 bis 0,66 dl/g, gemessen bei 25°C in einem Gemisch von PhenollTetrachlorethan 1 : 1 ; einen Thermoschrumpf bei 160°C und 0,1 cN/tex Vorspannkraft von < 2%; eine bei gleichen Temperatur- und Vorspannkraft-Bedingungen gemessene Schrumpfkraft von 0,1 cN/tex aufweisen.In detail, the thread according to the invention must simultaneously meet the following conditions: it must have an initial modulus of 200 to 800 cN / tex, in particular 350 to 500 cN / tex; a reversibility limit of 4 to 12 cN / tex, in particular 6 to 12 cN / tex; a boil-off shrinkage of 0 to 2.8%, in particular 0 to 2%; an intrinsic viscosity of 0.60 to 0.75 di / g, in particular 0.62 to 0.66 dl / g, measured at 25 ° C in a mixture of phenol tetrachloroethane 1: 1; thermal shrinkage at 160 ° C and 0.1 cN / tex pretensioning force of <2%; have a shrinkage force of 0.1 cN / tex measured under the same temperature and preload conditions.

Derweitgehend ausgeschrumpfte Faden hat den Vorteil, dass er im Falle einer Spulenfärbung direkt, ohne Dämpfen und Umspulen auf eine perforierte Färbehülse gezwirnt werden kann.The largely shrunk thread has the advantage that it can be twisted directly onto a perforated dye tube in the event of bobbin dyeing without steaming and rewinding.

Die Erfindung soll anhand von Beispielen näher erläutert werden.The invention will be explained in more detail by means of examples.

Als Ausgangsmaterial für beide Beispiele dient ein Polyester-POY gemäss dem Oberbegriff des Anspruchs 1 mit einer intrinsischen Viskosität von 0,62 di/g.A polyester POY according to the preamble of claim 1 with an intrinsic viscosity of 0.62 di / g serves as the starting material for both examples.

Beispiel 1 (kontinuierliches Verfahren)Example 1 (continuous process)

Ein Polyester-POY dtex 100 f 36, produziert bei einer Spinngeschwindigkeit von 3100 m/min, wird auf einer zweistufigen Streckzwirnmaschine in der 1. Stufe bei Raumtemperatur ohne Streckstift im Verhältnis 1 : 1,8 kaltverstreckt und anschliessend in der 2. Stufe mit 10% Voreilung über einen Plattenheizer von 48 cm Länge und einer Heizertemperatur von 225°C geführt. Die Verarbeitungsfadenzugkraft in der 2. Stufe resultiert aus der prozessbedingten Relaxierspannung. Direkt anschliessend erfolgt die Verwirbelung mit ca. 25 Knoten/Meter und die Aufwicklung bei 420 m/min.A polyester POY dtex 100 f 36, produced at a spinning speed of 3100 m / min, is cold drawn in a ratio of 1: 1.8 on a two-stage draw twister in the 1st stage at room temperature without a drawing pin and then in the 2nd stage with 10 % Lead over a plate heater of 48 cm in length and a heater temperature of 225 ° C. The processing thread tension in the 2nd stage results from the process-related relaxation tension. Immediately afterwards, the swirling takes place at approx. 25 knots / meter and the winding at 420 m / min.

Beispiel 2 (diskontinuiediches Verfahren)Example 2 (discontinuous process)

Ein bei 3100 m/min gesponnenes Polyester-POY dtex 100 f 36 wird bei einer Abzugsgeschwindigkeit von 530 mlmin und einem Verhältnis von 1 : 1, 8 ohne Streckstift bei Raumtemperatur verstreckt und unmittelbar nach der Streckzone mit ca. 15 Knoten/Meter verwirbelt. In einer zweiten Arbeitsoperation wird der Faden mit 20% Voreilung durch einen geschlossenen Strahlungsheizer von 70 cm Länge bei 225°C Heizertemperatur geführt. Auch hier entspricht die Verarbeitungsfadenzugkraft der prozessbedingten Relaxierspannung. Die Abzugsgeschwindigkeit beträgt 110 mlmin.A polyester POY dtex 100 f 36 spun at 3100 m / min is drawn at a take-off speed of 530 mlmin and a ratio of 1: 1.8 without a drawing pin at room temperature and swirled at about 15 knots / meter immediately after the drawing zone. In a second operation, the thread is fed through a closed radiation heater of 70 cm length at a heater temperature of 225 ° C with 20% advance. Here too, the processing thread tension corresponds to the process-related relaxation tension. The withdrawal speed is 110 mlmin.

Die erfindungsgemässen Polyesterfäden werden durch ihre charakteristischen Kurven in den Figuren 2-4 wiedergegeben. Hierbei sind die erhaltenen Kurven vom kontinuierlichen wie auch diskontinuierlichen Herstellungsverfahren praktisch identisch.The polyester threads according to the invention are represented by their characteristic curves in FIGS. 2-4. The curves obtained from the continuous and discontinuous production process are practically identical.

Es zeigen :

  • Fig. 1 Eine schematische Darstellung des erfindungsgemässen Verfahrens
  • Fig. 2 a-c Festigkeits-Dehnungskurven
    • a) PES dtex 84 f 36 ab Cops, ungeschrumpft (Vergleichsbeispiel)
    • b) PES mit 10% Voreilung (relaxiert)
    • c) PES mit 20% Voreilung "
  • Fig. 3 a-c Thermoschrumpfkurven an unbelasteten Fäden
    • a) PES dtex 84 f 36 ab Cops, ungeschrumpft (Vergleichsbeispiel)
    • b) PES mit 10% Voreilung (relaxiert)
    • c) PES mit 20% Voreilung "
  • Fig. 4 a-c Thermoschrumpfkurven an mit 0,1 cN/tex belasteten Fäden
    • a) PES dtex 84 f 36 ab Cops, ungeschrumpft (Vergleichsbeispiel)
    • b) PES mit 10% Voreilung (relaxiert)
    • . c) PES mit 20% Voreilung
Show it :
  • Fig. 1 is a schematic representation of the inventive method
  • Fig. 2 ac strength-elongation curves
    • a) PES dtex 84 f 36 ab Cops, unshrunk (comparative example)
    • b) PES with 10% lead (relaxed)
    • c) PES with 20% lead "
  • Fig. 3 ac thermal shrinkage curves on unloaded threads
    • a) PES dtex 84 f 36 ab Cops, unshrunk (comparative example)
    • b) PES with 10% lead (relaxed)
    • c) PES with 20% lead "
  • 4 ac thermal shrinkage curves on threads loaded with 0.1 cN / tex
    • a) PES dtex 84 f 36 ab Cops, unshrunk (comparative example)
    • b) PES with 10% lead (relaxed)
    • . c) PES with 20% lead

In Fig. 1 ist mit der Bezugsziffer 1 ein erstes Lieferwerk 1 bezeichnet. Dem Lieferwerk 1 ist ein zweites Lieferwerk 2 mit einer Separierrolle 2' nachgeschaltet. Ein Heizer 3 ist zwischen dem Lieferwerk 2 und einem Abzugswerk 4 mit einer Separierrolle 4' angeordnet, dem eine Wickeleinheit nachgeschaltet ist. Ein unverstrecktes Polyester-POY 5a wird vom Lieferwerk 1 aufgenommen und wird vom Lieferwerk 2 in einer Streckzone 5b kaltverstreckt. Das Abzugswerk 4 läuft mit einer geringeren Geschwindigkeit als das Lieferwerk 2, wodurch der verstreckte Faden mit einer einstellbaren Voreilung in einer Relaxationszone 5c den Heizer 3 durchläuft. Es resultiert ein heissrelaxierter Faden mit den erfindungsgemässen Eigenschaften.In Fig. 1, the reference numeral 1 denotes a first delivery plant 1. The delivery unit 1 is followed by a second delivery unit 2 with a separating roller 2 '. A heater 3 is arranged between the delivery unit 2 and a take-off unit 4 with a separating roller 4 ', which is followed by a winding unit. An undrawn polyester POY 5a is taken up by the delivery unit 1 and is cold-drawn by the delivery unit 2 in a stretching zone 5b. The take-off unit 4 runs at a lower speed than the delivery unit 2, as a result of which the drawn thread passes through the heater 3 with an adjustable advance in a relaxation zone 5c. The result is a heat-relaxed thread with the properties according to the invention.

Deutlich erkennbar sind die ausgeprägten Relaxierschultern der erfindungsgemässen Fäden in Fig. 2 sowie die im Verhältnis zu einem Normalfaden tiefen Schrumpfwerte über den gesamten Temperaturbereich (Fig. 3). Zudem erkennt man in Fig. 4 den markanten Vorspann-Kraft-Einfluss auf die Schrumpfung.The pronounced relaxation shoulders of the threads according to the invention in FIG. 2 and the shrinkage values which are low in relation to a normal thread over the entire temperature range (FIG. 3) are clearly recognizable. In addition, the striking preload-force influence on the shrinkage can be seen in FIG. 4.

Die Ergebnisse werden der besseren Uebersicht wegen in der folgenden Tabelle zusammengefasst :

Figure imgb0002
Figure imgb0003
Figure imgb0004

  • * Faden wird länger
  • ** Bezogen auf die Vorspannkraft resultiert durch die Wärmeeinwirkung eine Kraftreduktion
For the sake of clarity, the results are summarized in the following table:
Figure imgb0002
Figure imgb0003
Figure imgb0004
  • * Thread is getting longer
  • ** Relative to the pre-tensioning force, the effect of the heat is reduced

Der erfindungsgemässe Faden ist für Webware, Maschenware und besonders für Polware wie Samt, Velour etc. geeignet. Die verbesserten taktilen Eigenschaften sind denjenigen von Celluloseacetat und Viscose sehr ähnlich.The thread according to the invention is suitable for woven goods, knitted goods and especially for pile goods such as velvet, velor etc. The improved tactile properties are very similar to those of cellulose acetate and viscose.

Claims (5)

1. A method for the production of a flat, cold-drawn, multiple filament yarn made from polyester-POY, characterized in that the polyester-POY is homogeneously cold-drawn in a first step of the method with a draw ratio of at least 1.6 and in that it is heat-relaxed in a second method step with an overfeed of 10 to 20%.
2. A method according to claim 1, characterized in that the heat relaxation is effected at 140 to 250°C in a dry medium.
3. A method according to claim 1, characterized in that the heat relaxation is effected at 70 to 140°C in a wet medium.
4. A method according to one of claims 1 to 3, characterized in that during the heat relaxation, the take off speed amounts to 100 to 1000 m/min.
5. A polyester filament yam produced in accordance with the method of claims 1 to 4, characterized in that the yarn does at the same time meet the following conditions :
Figure imgb0006
EP87906653A 1986-10-24 1987-10-20 Process for manufacturing a smooth polyester yarn and polyester yarn manufactured by this process Expired - Lifetime EP0287604B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87906653T ATE62281T1 (en) 1986-10-24 1987-10-20 PROCESS FOR MAKING A SMOOTH POLYESTER THREAD AND POLYESTER THREAD MADE BY PROCESS.

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH4239/86 1986-10-24
CH423986 1986-10-24
PCT/CH1987/000143 WO1988003185A1 (en) 1986-10-24 1987-10-20 Process for manufacturing a smooth polyester yarn and polyester yarn manufactured by this process

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EP0287604B1 true EP0287604B1 (en) 1991-04-03
EP0287604B2 EP0287604B2 (en) 1995-03-15

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0345307B1 (en) * 1987-10-13 1992-05-27 Rhône-Poulenc Viscosuisse SA Process for manufacturing a smooth polyester yarn and yarn so obtained
EP0613505A1 (en) * 1991-11-18 1994-09-07 E.I. Du Pont De Nemours And Company Improvements in polyester filaments, yarns and tows
CA2143424A1 (en) * 1993-07-02 1995-01-12 Halim Baris Process for producing soil-repellent and abrasion-resistant monofilaments and their use
FR2750706B1 (en) * 1996-07-04 1998-11-20 Rhone Poulenc Fibres & Polymer FILAMENTS OF SYNTHETIC MATERIAL AND METHOD FOR MANUFACTURING SUCH A FILAMENT
GB2319745B (en) * 1996-11-27 2001-01-10 Du Pont Spinning machine and conversion process
US6763559B2 (en) * 2002-04-25 2004-07-20 Scimed Life Systems, Inc. Cold drawing process of polymeric yarns suitable for use in implantable medical devices
ITFI20060016A1 (en) * 2006-01-18 2007-07-19 Crotti Mariella DEVICE AND METHOD FOR IRONING A YARN, AND YARN PACKAGING SOON

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EP0287604B2 (en) 1995-03-15
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CA1292602C (en) 1991-12-03
US4950539A (en) 1990-08-21

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