EP0364874B1 - Method for making a composite yarn - Google Patents

Method for making a composite yarn Download PDF

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Publication number
EP0364874B1
EP0364874B1 EP89118903A EP89118903A EP0364874B1 EP 0364874 B1 EP0364874 B1 EP 0364874B1 EP 89118903 A EP89118903 A EP 89118903A EP 89118903 A EP89118903 A EP 89118903A EP 0364874 B1 EP0364874 B1 EP 0364874B1
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EP
European Patent Office
Prior art keywords
yarn
thread
treatment
air jet
low
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EP89118903A
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German (de)
French (fr)
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EP0364874A2 (en
EP0364874A3 (en
Inventor
Bernd Gehrmann
Heinz Treptow
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Oerlikon Barmag AG
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Barmag AG
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Classifications

    • 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
    • D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
    • D02G1/20—Combinations of two or more of the above-mentioned operations or devices; After-treatments for fixing crimp or curl
    • 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
    • D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
    • D02G1/02—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist
    • D02G1/0206—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist by false-twisting
    • D02G1/0266—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist by false-twisting false-twisting machines
    • 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
    • D02G3/32—Elastic yarns or threads ; Production of plied or cored yarns, one of which is elastic
    • D02G3/328—Elastic yarns or threads ; Production of plied or cored yarns, one of which is elastic containing elastane
    • 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
    • D02J1/08—Interlacing constituent filaments without breakage thereof, e.g. by use of turbulent air streams

Definitions

  • the invention relates to a method according to the preamble of claim 1. Such a method is known from EP-A-0 269 184.
  • thermoplastic i.e. a relatively low-stretch thread together with an elastane thread, which has a relatively high extensibility of e.g. has more than ten times the initial length
  • elastane thread which has a relatively high extensibility of e.g. has more than ten times the initial length
  • the air jet treatment can only result in an intensive and even connection of the two threads if the merged threads are passed through the air jet treatment at low speed or if a particularly intensive air jet treatment is carried out at high air pressure and high air throughput.
  • a low-stretch thread is likewise passed through a blowing nozzle together with an elastane thread of relatively high extensibility and is subjected to an air jet treatment in the blowing nozzle.
  • the low-stretch thread is subjected to a spreading treatment in order to facilitate the connection of the two threads.
  • the object of the invention is to further develop the method known from EP-A-0 269 184 and to design it in such a way that a high-quality composite yarn with intensive interweaving of the individual components is produced at high thread speeds and with an air jet treatment associated with low energy input.
  • the object is achieved in a generic method by the characterizing part of claim 1.
  • the spreading treatment provided in particular for the low-stretch thread can also be provided for both threads, and in particular if the spreading treatment is carried out only after the two threads provided for forming the composite thread have been brought together.
  • the spreading treatment means that the air can attack better in the air jet treatment, so that there is more intensive interweaving. Contrary to expectations, the mean distance between the interweaving zone is also shortened and equalized, so that even at high yarn speeds there is no danger that inadmissibly long pieces of yarn without interweaving zones will occur.
  • a favorable spreading treatment with regard to the course of the process and the capital expenditure is pulling the tensioned thread over an edge or cutting edge.
  • thermoplastic thread is subjected to a false twist treatment before being connected to the elastane thread, the merging with the elastane thread taking place at or immediately after the false twist has been released.
  • the dissolution of the false twist if the false twist is also associated with a promotion of the thread, leads to the individual filaments separating from one another and the thread becoming more voluminous, the spreading of the individual filaments being brought about (claim 3). It is therefore possible to integrate the method according to the invention into the method of false twist texturing of the thermoplastic thread.
  • the false twist texturing usually takes place at thread speeds which are above 600 m / min and also above 800 m / min. It has been shown that the dissolution of the false twist causes the thermoplastic thread to spread, which is necessary for the production of a composite thread provides very favorable preconditions and allows the manufacture of the composite thread to be integrated into the texturing process of the thermoplastic thread. As suggested by claim 4, the thermoplastic thread is drawn from the false twist zone with a thread tension between 0.2 and 0.6 cN / dtex from the false twist unit.
  • the types of spreading treatment described above are based on mechanical action on the thread. Where this is not desired for reasons of textile technology or is in conflict with the achievement of high thread speeds in the production of the composite thread, the thread can be spread by a suitable fluid nozzle. Such is e.g. described in the unpublished DE-A-38 35 169. However, it cannot be ruled out that other fluid nozzles, in particular air nozzles, also lead to a sufficient spreading of the individual filaments.
  • the nozzle mentioned above has the advantage that the spreading takes place essentially in one plane and that the effort in terms of pressure and air volume is low.
  • the spreading treatment can optionally be carried out only on the thermoplastic thread or after being combined with the elastane thread (claim 5).
  • the elastane thread is combined with the low-stretch thread in the tensioned state (claim 8).
  • the thread tension is preferably applied by predetermined constant supply (claim 11) It is particularly important that the composite thread of the air jet treatment is supplied with tradition (claim 7), and that the thread tension is kept constant during the air jet treatment by a supply unit upstream of the winding.
  • the relaxation in the air treatment zone gives the composite thread high elasticity and bulk (crimp) with good coverage and great comfort, but above all an intensive mixing and knotting (tangling) of the previously spread filaments.
  • the measure according to claim 10 contributes to this, for example.
  • the bobbin can be produced with the desired hardness on the one hand, without the thread properties to be achieved by the air jet treatment being impaired thereby. On the other hand, thread tension fluctuations caused by the winding cannot have a disturbing effect in the air jet treatment.
  • the elastane thread is drawn off from the supply spool 14 overhead.
  • the head package is preceded coaxially by a head thread guide 27.
  • the elastane thread is drawn off by the delivery mechanism 28 and then guided to the withdrawal mechanism 12.
  • the thermoplastic thread is drawn off from the supply spool 1 by the thread guide 4 by means of take-off mechanism 5.
  • the thread is then passed over a drafting pin 29 with a wrap angle of 360 °, drawn off from the drafting zone by the drafting device 30 and then also led to the draw-off device 12.
  • the threads are pulled off together by the take-off mechanism 12, but are preferably guided separately, as shown in FIG. 1 / 2A.
  • the threads are guided through a tangel nozzle 19 and drawn off from it by the take-off unit 31.
  • the threads are then wound on the take-up spool 24, for which purpose the take-up spool 24 is driven on its circumference by the drive roller 25.
  • the location of a traversing device, not shown, is indicated schematically between the delivery mechanism 31 and the drive roller 25.
  • thermoplastic thread is drawn between the take-off unit 5 and the drafting unit 30.
  • the stretching point or the stretching zone is formed on or behind the stretching pin 29.
  • the peripheral speed of the take-off unit 28 for the elastane thread is set in relation to the peripheral speed of the take-off unit 12 such that both the thermoplastic thread and the elastane thread run towards the extractor unit in the tensioned state.
  • the thread tension of the elastane thread is preferably between 0.1 and 0.3 cN / dtex, while the thread tension of the low-stretch, thermoplastic thread is between 0.2 and 0.8 cN / dtex.
  • the peripheral speed of the extraction mechanism 31 is at least 2% lower, preferably 6 to 9% lower than the peripheral speed of the extraction mechanism 12.
  • the process sequences according to FIGS. 1 to 3 differ in the type of spreading treatment which serves in all cases to loosen the fiber composite of the individual filaments of the low-stretch thread 1 held together by adhesive and cohesive forces.
  • the spreading treatment takes place in the stretching zone.
  • the combination of a thread guide 33 with two overflow edges 33.1 and 33.2 and a knife 34 which projects between the overflow edges 33.1 and 33.2 serves as the spreading device 32.
  • the thread is passed between the overflow edges 33.1, 33.2 and the knife and is tensioned and spread along the knife edge.
  • the spreading device consists of a spreading nozzle, as shown in detail in DE-A-38 35 169 and in FIG. 5 mentioned above.
  • a spreading nozzle is also provided as the spreading device 32, but in this case is provided directly in front of the air jet treatment nozzle (tangle nozzle) 19.
  • the supply spool 1 with a thermoplastic thread 1, for example nylon, perlon, polyester, is plugged onto a drain mandrel 3 on the gate 2, which is only partially shown.
  • the thread is guided through the centrally arranged top thread guide 4 and drawn off by a feed mechanism 5.
  • the Delivery unit 5 is driven by motor 7.
  • the thread is pressed by the pressure roller 6, which is under spring force, against the surface of the delivery mechanism 5.
  • the thread is guided over a heating plate 9 and a subsequent cooling plate 10 before it runs into the false twister 11 - indicated here as a friction false twister with a plurality of disks which are attached to three rotating axes.
  • the thread is withdrawn from the false twist zone by the delivery mechanism 12.
  • the delivery mechanism 12 is driven by the motor 13.
  • the thread is pressed against the surface of the delivery mechanism 12 by a strap looped over two freely rotating rollers.
  • elastane thread on the supply spool 14. It is a highly elastic, rubber-like, elastomeric continuous thread.
  • the coil 14 is mounted in a rocker 17 on the gate 2 and lies with its circumference on a drive roller 15.
  • the drive roller 15 is driven by the motor 16 such that the elastane thread is unwound.
  • the elastane thread is guided via the deflection roller 18 separately from and parallel to the thermoplastic thread into the feed mechanism 12.
  • This blowing nozzle 19 is a tangel nozzle.
  • the function of the Tangel nozzle is to form knots between the individual filaments of the two threads, which are repeated in a more or less regular sequence.
  • Behind the tangel nozzle 19 the now combined thread is passed over an oil roller 20 which is driven by the motor 22 at low speed.
  • the thread is then fed to the take-up spool 24 via a deflection 23 and a traversing device, not shown.
  • the take-up reel 24 lies on the drive roller 25 and is driven by the motor 26 at a predetermined constant speed.
  • the drawing mechanism 31 shown in broken lines is also provided between the tang nozzle 19 and the winding 24, 25.
  • the speed of the draw-off mechanism 31 can be set independently of the speed of the other yarn feed mechanisms and the drive rollers 15 and 25.
  • thermoplastic thread is only pre-oriented. It is stretched between the delivery plants 5 and 12.
  • the delivery mechanism 12 is therefore driven in relation to the delivery mechanism 5 at a speed ratio of 1.1: 1 to 2: 1.
  • a thread tension of 0.3 to 0.8 cN / dtex is established in front of the delivery mechanism 12.
  • the drive roller 15 of the supply spool 14 for the elastane thread is driven at a significantly lower peripheral speed than the feed mechanism 12.
  • the speed ratio is between 1: 2 and 1: 4.
  • the thread tension of the elastane thread is therefore between 0.1 and 0.4 cN / dtex in front of the delivery mechanism 12.
  • the speed of the drive roller 25 for the take-up reel 24 is lower than the speed of the supply mechanism 12, preferably between 4 and 10% lower. If the withdrawal mechanism 31 is provided, these speed ratios apply to the delivery mechanism 12 and the withdrawal mechanism 31.
  • the relative thread tension during winding is very low, since the tensile forces are only absorbed by the elastane thread portion of the combination thread, but the titer is essentially equal to the sum of the individual titer.
  • the drop in the relative thread tension results from the fact that the absolute thread tension of the elastane thread in front of the feed mechanism 12 or 28 was 7 cN in one example, while the absolute thread tension of the combination thread behind the tangle nozzle is 5 cN.
  • the thread can be passed through a heating device in front of the blowing nozzle or preferably after the blowing nozzle 19, preferably before the take-off mechanism 31, in order to calm the tendency to twist of the previously twisted thermoplastic thread.
  • Polyester, nylon or perlon are particularly suitable as thermoplastic threads.
  • the threads are brought together only in or shortly before the tangle nozzle 19, since otherwise there is a connection of the two threads, which is caused by the tendency of the previously false-twisted textured thread to curl and which interferes with the image of the overall thread.
  • the elastane thread and the thermoplastic thread can only be brought together as late as possible, preferably only after the delivery mechanism 12 which closes the false twist zone 9-11, if one wants to prevent the two threads being connected by the tendency of the thermoplastic thread to curl .
  • thermoplastic thread must be fed to the tangle nozzle 19 at a speed which leads to extensive relaxation of the thermoplastic thread in the zone of the merging. If this does not happen, the low-stretch thermoplastic thread does not take part in the twisting and knotting by the air jet treatment, and the mixing and knotting of the threads becomes less intensive. On the other hand, the relaxation of the composite thread must remain limited so that the process is not disturbed. In contrast, the winding speed must be chosen so high that neither very soft, unstable, unusable bobbins 24 nor unbearably hard bobbins 24 with thread damage are produced.
  • FIG. 5 shows a suitable expansion nozzle in longitudinal section, which can be used in the process sequence according to FIG. 2 or 3.
  • a thread tube 43 is fastened with its lower end in a mounting block 39.
  • the compressed air connection 38 opens into a collecting space 51, which continues in two compressed air channels 49.
  • the two compressed air channels 49 nestle against the outer circumference of the thread tube. Their diameter is smaller than that of the thread tube.
  • the inner boundary of the compressed air channels is formed by the outer wall of the thread tube.
  • the compressed air channels are diametrically opposed with respect to the thread tube.
  • the outer walls of the compressed air channels are convergent with respect to the axial direction of the thread tube and form a cross section with a minimum width 46.
  • the channels 49 emerge into the free environment.
  • the channels and the thread tube 43 are directed to a constriction 44.
  • the thread tube 43 and the two compressed air channels 49 are arranged together with the center points M of the two balls 42 and the constriction 44 in the plane in which the continuous thread is guided and spread out into its individual filaments 9.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)

Description

Die Erfindung betrifft ein Verfahren nach dem Oberbegriff des Anspruchs 1.
Ein solches Verfahren ist durch die EP-A-0 269 184 bekannt.The invention relates to a method according to the preamble of claim 1.
Such a method is known from EP-A-0 269 184.

Durch die DE-A-25 39 668 ist ein Verfahren bekannt, bei dem ein thermoplastischer, d.h. ein verhältnismäßig dehnungsarmer Faden gemeinsam mit einem Elastanfaden, der eine verhältnismäßig hohe Dehnbarkeit von z.B. mehr als dem Zehnfachen der Ausgangslänge besitzt, durch eine Blasdüse geführt und derart aus der Blasdüse abgezogen wird, daß der Zuführungsüberschuß des dehnungsarmen Fadens 0% beträgt. Bei diesem Verfahren kann durch die Luftstrahlbehandlung nur dann eine intensive und auch gleichmäßige Verbindung der beiden Fäden erfolgen, wenn die zusammengeführten Fäden mit geringer Geschwindigkeit durch die Luftstrahlbehandlung geführt werden oder wenn bei hohem Luftdruck und großem Luftdurchsatz eine besonders intensive Luftstrahlbehandlung erfolgt.From DE-A-25 39 668 a method is known in which a thermoplastic, i.e. a relatively low-stretch thread together with an elastane thread, which has a relatively high extensibility of e.g. has more than ten times the initial length, is passed through a blowing nozzle and is withdrawn from the blowing nozzle in such a way that the excess supply of the low-stretch thread is 0%. In this method, the air jet treatment can only result in an intensive and even connection of the two threads if the merged threads are passed through the air jet treatment at low speed or if a particularly intensive air jet treatment is carried out at high air pressure and high air throughput.

Bei dem durch die eingangs genannte EP-A-0 269 184 bekannt gewordenen Verfahren wird ebenfalls ein dehnungsarmer Faden gemeinsam mit einem Elastanfaden von verhältnismäßig hoher Dehnbarkeit durch eine Blasdüse geführt und in der Blasdüse einer Luftstrahlbehandlung unterzogen. Vor dem Zusammenführen des dehnungsarmen Fadens mit dem Elastanfaden zur gemeinsamen Führung durch die Luftblaszone wird bei diesem Verfahren jedoch der dehnungsarme Faden zur Erleichterung der Verbindung der beiden Fäden einer Spreizbehandlung unterworfen.In the method known from the aforementioned EP-A-0 269 184, a low-stretch thread is likewise passed through a blowing nozzle together with an elastane thread of relatively high extensibility and is subjected to an air jet treatment in the blowing nozzle. Before the low-stretch thread is brought together with the elastane thread for joint guidance through the air-blowing zone, however, the low-stretch thread is subjected to a spreading treatment in order to facilitate the connection of the two threads.

Aufgabe der Erfindung ist es, das aus der EP-A-0 269 184 bekannte Verfahren weiterzubilden und so auszugestalten, daß bei hohen Fadengeschwindigkeiten und einer mit niedrigem Energieeinsatz verbundenen Luftstrahlbehandlung ein qualitativ hochwertiges Verbundgarn mit intensiver Verflechtung der Einzelkomponenten entsteht. Die Aufgabe wird bei einem gattungsgemäßen Verfahren durch das Kennzeichen des Anspruchs 1 gelöst.The object of the invention is to further develop the method known from EP-A-0 269 184 and to design it in such a way that a high-quality composite yarn with intensive interweaving of the individual components is produced at high thread speeds and with an air jet treatment associated with low energy input. The object is achieved in a generic method by the characterizing part of claim 1.

Dabei kann die insbesondere für den dehnungsarmen Faden vorgesehene Spreizbehandlung auch bei beiden Fäden und insbesondere dann vorgesehen werden, wenn die Spreizbehandlung erst nach dem Zusammenführen der beiden zur Bildung des Verbundfadens vorgesehenen Fäden erfolgt.The spreading treatment provided in particular for the low-stretch thread can also be provided for both threads, and in particular if the spreading treatment is carried out only after the two threads provided for forming the composite thread have been brought together.

Die Spreizbehandlung bewirkt, daß die Luft in der Luftstrahlbehandlung besser angreifen kann, so daß eine intensivere Verflechtung entsteht. Wider Erwarten wird hierdurch auch der mittlere Abstand der Verflechtungszone verkürzt und vergleichmäßigt, so daß auch bei hohen Fadenlaufgeschwindigkeiten nicht die Gefahr besteht, daß unzulässig lange Fadenstücke ohne Verflechtungszonen entstehen.The spreading treatment means that the air can attack better in the air jet treatment, so that there is more intensive interweaving. Contrary to expectations, the mean distance between the interweaving zone is also shortened and equalized, so that even at high yarn speeds there is no danger that inadmissibly long pieces of yarn without interweaving zones will occur.

Eine hinsichtlich des Verfahrensablaufs und des Investitionsaufwandes günstige Spreizbehandlung ist das Ziehen des gespannten Fadens über eine Kante oder Schneide.A favorable spreading treatment with regard to the course of the process and the capital expenditure is pulling the tensioned thread over an edge or cutting edge.

Eine andere Möglichkeit der Spreizbehandlung liegt darin, daß der thermoplastische Faden vor der Verbindung mit dem Elastanfaden einer Falschzwirnbehandlung unterworfen wird, wobei die Zusammenführung mit dem Elastanfaden bei oder unmittelbar nach dem Auflösen des Falschzwirns erfolgt. Die Auflösung des Falschzwirns führt, wenn die Falschzwirnung auch mit einer Förderung des Fadens verbunden ist, dazu, daß die Einzelfilamente sich voneinander trennen und der Faden voluminöser wird, wobei die Spreizung der Einzelfilamente herbeigeführt wird (Anspruch 3). Daher ist es möglich, das erfindungsgemäße Verfahren in das Verfahren des Falschzwirn-Texturierens des thermoplastischen Fadens zu integrieren.Another possibility of the spreading treatment is that the thermoplastic thread is subjected to a false twist treatment before being connected to the elastane thread, the merging with the elastane thread taking place at or immediately after the false twist has been released. The dissolution of the false twist, if the false twist is also associated with a promotion of the thread, leads to the individual filaments separating from one another and the thread becoming more voluminous, the spreading of the individual filaments being brought about (claim 3). It is therefore possible to integrate the method according to the invention into the method of false twist texturing of the thermoplastic thread.

Das Falschzwirn-Texturieren erfolgt üblicherweise mit Fadengeschwindigkeiten, die oberhalb 600 m/min und auch oberhalb 800 m/min liegen. Es hat sich gezeigt, daß durch die Auflösung des Falschzwirns eine Spreizung des thermoplastischen Fadens erfolgt, die für die Herstellung eines Verbundfadens sehr günstige Vorbedingungen liefert und es gestattet, die Herstellung des Verbundfadens in den Texturierprozeß des thermoplastischen Fadens zu integrieren. Dabei wird - wie durch Anspruch 4 vorgeschlagen - der thermoplastische Faden aus der Falschzwirnzone mit einer Fadenspannung zwischen 0,2 bis 0,6 cN/dtex von dem Falschzwirnaggregat abgezogen.The false twist texturing usually takes place at thread speeds which are above 600 m / min and also above 800 m / min. It has been shown that the dissolution of the false twist causes the thermoplastic thread to spread, which is necessary for the production of a composite thread provides very favorable preconditions and allows the manufacture of the composite thread to be integrated into the texturing process of the thermoplastic thread. As suggested by claim 4, the thermoplastic thread is drawn from the false twist zone with a thread tension between 0.2 and 0.6 cN / dtex from the false twist unit.

Dabei ergibt sich, daß die Garneigenschaften, insbesondere bei der Verarbeitung zu Strumpfgarn, wesentlich verbessert werden und ein gleichmäßigeres Bild erzielt wird.The result is that the yarn properties, in particular when processing into hosiery yarn, are significantly improved and a more uniform image is achieved.

Die vorhergehend geschilderten Arten der Spreizbehandlung beruhen auf einer mechanischen Einwirkung auf den Faden. Wo eine solche aus textiltechnischen Gründen nicht erwünscht ist oder der Erzielung hoher Fadengeschwindigkeiten bei der Herstellung des Verbundfadens entgegensteht, bietet sich die Spreizung des Fadens durch eine geeignete Fluiddüse an. Eine solche ist z.B. in der nicht vorveröffentlichten DE-A-38 35 169 beschrieben. Es ist jedoch nicht auszuschließen, daß auch andere Fluiddüsen, insbesondere Luftdüsen, zu einer ausreichenden Spreizung der Einzelfilamente führen. Die zuvor erwähnte Düse hat den Vorteil, daß die Spreizung im wesentlichen in einer Ebene erfolgt, und daß der Aufwand hinsichtlich Druck und Luftmenge gering ist.The types of spreading treatment described above are based on mechanical action on the thread. Where this is not desired for reasons of textile technology or is in conflict with the achievement of high thread speeds in the production of the composite thread, the thread can be spread by a suitable fluid nozzle. Such is e.g. described in the unpublished DE-A-38 35 169. However, it cannot be ruled out that other fluid nozzles, in particular air nozzles, also lead to a sufficient spreading of the individual filaments. The nozzle mentioned above has the advantage that the spreading takes place essentially in one plane and that the effort in terms of pressure and air volume is low.

Die Spreizbehandlung kann wahlweise nur an dem thermoplastischen Faden oder nach der Zusammenführung mit dem Elastanfaden erfolgen (Anspruch 5).The spreading treatment can optionally be carried out only on the thermoplastic thread or after being combined with the elastane thread (claim 5).

Der Elastanfaden wird mit dem dehnungsarmen Faden im gespannten Zustand vereinigt (Anspruch 8). Die Fadenspannung wird vorzugsweise durch vorgegebene konstante Zulieferung aufgebracht (Anspruch 11)
Dabei ist es von besonderer Wichtigkeit, daß der Verbundfaden der Luftstrahlbehandlung mit Überlieferung zugeführt wird (Anspruch 7), und daß die Fadenspannung während der Luftstrahlbehandlung durch ein der Aufwicklung vorgeschaltetes Lieferwerk konstant gehalten wird. Durch die Entspannung in der Luftbehandlungszone erhält der Verbundfaden hohe Dehnbarkeit und hohen Bausch (Kräuselung) bei guter Deckkraft und großem Tragekomfort, vor allem aber eine intensive Durchmischung und Verknotung (Tangelung) der zuvor aufgespreizten Filamente. Hierzu trägt beispielsweise die Maßnahme nach Anspruch 10 bei.The elastane thread is combined with the low-stretch thread in the tensioned state (claim 8). The thread tension is preferably applied by predetermined constant supply (claim 11)
It is particularly important that the composite thread of the air jet treatment is supplied with tradition (claim 7), and that the thread tension is kept constant during the air jet treatment by a supply unit upstream of the winding. The relaxation in the air treatment zone gives the composite thread high elasticity and bulk (crimp) with good coverage and great comfort, but above all an intensive mixing and knotting (tangling) of the previously spread filaments. The measure according to claim 10 contributes to this, for example.

Dadurch, daß der Faden zwischen der Luftstrahlbehandlung und der Aufwicklung durch ein Lieferwerk gefördert wird, läßt sich einerseits die Spule mit der gewünschten Härte herstellen, ohne daß die durch die Luftstrahlbehandlung zu erzielenden Fadeneigenschaften hierdurch beeinträchtigt werden. Andererseits können sich Fadenspannungsschwankungen, die durch die Aufwicklung verursacht sind, in der Luftstrahlbehandlung nicht störend bemerkbar machen.Because the thread between the air jet treatment and the winding is conveyed by a delivery unit, the bobbin can be produced with the desired hardness on the one hand, without the thread properties to be achieved by the air jet treatment being impaired thereby. On the other hand, thread tension fluctuations caused by the winding cannot have a disturbing effect in the air jet treatment.

Im folgenden werden Ausführungsbeispiele der Erfindung beschrieben.Exemplary embodiments of the invention are described below.

Es zeigen:

Fig. 1
den schematischen Verfahrensablauf mit einer Spreizbehandlung durch eine Kante;
Fig. 2
den schematischen Verfahrensablauf mit einer Spreizbehandlung durch Spreizdüse;
Fig. 3
den schematischen Verfahrensablauf mit einer Spreizbehandlung des verbundenen Verfahrens;
Fig. 4
Verfahrensablauf mit Integration in ein Falschzwirn-Texturierverfahren;
Fig. 5
eine Spreizdüse.
Show it:
Fig. 1
the schematic procedure with a spreading treatment by an edge;
Fig. 2
the schematic process flow with a spreading treatment by expanding nozzle;
Fig. 3
the schematic procedure with a spread treatment of the associated method;
Fig. 4
Process sequence with integration in a false twist texturing process;
Fig. 5
an expanding nozzle.

Bei den Verfahrensabläufen nach den Figuren 1 bis 3 wird der Elastanfaden von der Vorlagespule 14 über Kopf abgezogen. Dazu ist der Vorlagespule koaxial ein Kopffadenführer 27 vorgeordnet. Der Elastanfaden wird durch das Lieferwerk 28 abgezogen und sodann zu dem Abzugswerk 12 geführt. Der thermoplastische Faden wird von der Vorlagespule 1 durch den Fadenführer 4 mittels Abzugwerk 5 abgezogen. Der Faden wird sodann mit einem Umschlingungswinkel von 360° über einen Streckstift 29 geführt, aus der Streckzone durch das Streckwerk 30 abgezogen und dann ebenfalls zu dem Abzugwerk 12 geführt. Durch das Abzugwerk 12 werden die Fäden zwar gemeinsam abgezogen, vorzugsweise jedoch getrennt geführt, wie Fig. 1/2A zeigt. Von dem Abzugwerk 12 werden die Fäden durch eine Tangeldüse 19 geführt und aus dieser durch das Abzugwerk 31 abgezogen. Anschließend werden die Fäden auf der Aufwickelspule 24 aufgewickelt, wozu die Aufwickelspule 24 durch die Treibwalze 25 an ihrem Umfang angetrieben wird. Zwischen Lieferwerk 31 und Treibwalze 25 ist schematisch die Lage einer nicht näherbezeichneten Changiereinrichtung angedeutet.In the process sequences according to FIGS. 1 to 3, the elastane thread is drawn off from the supply spool 14 overhead. For this purpose, the head package is preceded coaxially by a head thread guide 27. The elastane thread is drawn off by the delivery mechanism 28 and then guided to the withdrawal mechanism 12. The thermoplastic thread is drawn off from the supply spool 1 by the thread guide 4 by means of take-off mechanism 5. The thread is then passed over a drafting pin 29 with a wrap angle of 360 °, drawn off from the drafting zone by the drafting device 30 and then also led to the draw-off device 12. The threads are pulled off together by the take-off mechanism 12, but are preferably guided separately, as shown in FIG. 1 / 2A. From the take-off unit 12, the threads are guided through a tangel nozzle 19 and drawn off from it by the take-off unit 31. The threads are then wound on the take-up spool 24, for which purpose the take-up spool 24 is driven on its circumference by the drive roller 25. The location of a traversing device, not shown, is indicated schematically between the delivery mechanism 31 and the drive roller 25.

Der Verfahrensablauf ist in den in den Figuren 1 bis 3 gezeigten Fällen folgender:
Der thermoplastische Faden wird zwischen dem Abzugwerk 5 und dem Streckwerk 30 verstreckt. Dabei bildet sich der Streckpunkt bzw. die Streckzone auf oder hinter dem Streckstift 29 aus. Die Umfangsgeschwindigkeit des Abzugwerks 28 für den Elastanfaden ist gegenüber der Umfangsgeschwindigkeit des Abzugwerks 12 so eingestellt, daß sowohl der thermoplastische Faden als auch der Elastanfaden dem Abzugwerk im gespannten Zustand zulaufen. Dabei liegt die Fadenspannung des Elastanfadens vorzugsweise zwischen 0,1 und 0,3 cN/dtex, während die Fadenspannung des dehnungsarmen, thermoplastischen Fadens zwischen 0,2 und 0,8 cN/dtex liegt.The procedure in the cases shown in FIGS. 1 to 3 is as follows:
The thermoplastic thread is drawn between the take-off unit 5 and the drafting unit 30. The stretching point or the stretching zone is formed on or behind the stretching pin 29. The peripheral speed of the take-off unit 28 for the elastane thread is set in relation to the peripheral speed of the take-off unit 12 such that both the thermoplastic thread and the elastane thread run towards the extractor unit in the tensioned state. The thread tension of the elastane thread is preferably between 0.1 and 0.3 cN / dtex, while the thread tension of the low-stretch, thermoplastic thread is between 0.2 and 0.8 cN / dtex.

Die Umfangsgeschwindigkeit des Abzugwerks 31 ist mindestens 2% geringer, vorzugsweise 6 bis 9% geringer als die Umfangsgeschwindigkeit des Abzugswerks 12.The peripheral speed of the extraction mechanism 31 is at least 2% lower, preferably 6 to 9% lower than the peripheral speed of the extraction mechanism 12.

Die Verfahrensabläufe nach den Figuren 1 bis 3 unterscheiden sich durch die Art der Spreizbehandlung, die in allen Fällen der Auflockerung des durch Adhäsions- und Kohäsionskräfte zusammengehaltenen Faserverbundes der Einzelfilamente des dehnungsarmen Fadens 1 dient.
Bei dem Verfahrensablauf nach Fig. 1 erfolgt die Spreizbehandlung in der Streckzone. Als Spreizeinrichtung 32 dient die Kombination aus einem Fadenführer 33 mit zwei Überlaufkanten 33.1 und 33.2 und einem Messer 34, das zwischen die Überlaufkanten 33.1 und 33.2 ragt. Der Faden wird zwischen den Überlaufkanten 33.1, 33.2 und dem Messer hindurchgeführt und dabei gespannt und längs der Messerkante aufgespreizt.The process sequences according to FIGS. 1 to 3 differ in the type of spreading treatment which serves in all cases to loosen the fiber composite of the individual filaments of the low-stretch thread 1 held together by adhesive and cohesive forces.
1, the spreading treatment takes place in the stretching zone. The combination of a thread guide 33 with two overflow edges 33.1 and 33.2 and a knife 34 which projects between the overflow edges 33.1 and 33.2 serves as the spreading device 32. The thread is passed between the overflow edges 33.1, 33.2 and the knife and is tensioned and spread along the knife edge.

Im Verfahrensablauf nach Fig. 2 besteht die Spreizeinrichtung aus einer Spreizdüse, wie sie im einzelnen in der zuvor erwähnten DE-A-38 35 169 und in Fig. 5 gezeigt ist.In the process sequence according to FIG. 2, the spreading device consists of a spreading nozzle, as shown in detail in DE-A-38 35 169 and in FIG. 5 mentioned above.

Bei dem Verfahrensablauf nach Fig. 3 ist als Spreizeinrichtung 32 ebenfalls eine Spreizdüse vorgesehen, die in diesem Falle jedoch unmittelbar vor der Luftstrahlbehandlungsdüse (Tangeldüse) 19 vorgesehen ist.In the process sequence according to FIG. 3, a spreading nozzle is also provided as the spreading device 32, but in this case is provided directly in front of the air jet treatment nozzle (tangle nozzle) 19.

Mit 20, 21 sind eine Ölwalze und eine Ölwanne zum Avivieren des Verbundfadens bezeichnet.With 20, 21, an oil roller and an oil pan for finishing the composite thread are designated.

Für das Ausführungsbeispiel nach Fig. 4 gilt folgendes: Die Vorlagespule 1 mit einem thermoplastischen Faden 1, z.B. Nylon, Perlon, Polyester, ist an dem nur teilweise dargestellten Gatter 2 auf einem Ablaufdorn 3 aufgesteckt. Der Faden wird durch den zentrisch angeordneten Kopffadenführer 4 geführt und durch ein Lieferwerk 5 abgezogen. Das Lieferwerk 5 wird durch den Motor 7 angetrieben. Dabei wird der Faden durch die Andrückrolle 6, die unter Federkraft steht, gegen die Oberfläche des Lieferwerks 5 gedrückt. Nach den Umlenkungen 8 wird der Faden über eine Heizplatte 9 und eine anschließende Kühlplatte 10 geführt, bevor er in den Falschdrallgeber 11 - hier angedeutet als Friktionsfalschdrallgeber mit einer Vielzahl von Scheiben, die auf drei rotierenden Achsen aufgesteckt sind - einläuft. Durch das Lieferwerk 12 wird der Faden aus der Falschdrallzone abgezogen. Das Lieferwerk 12 wird durch den Motor 13 angetrieben. Der Faden wird durch ein über zwei frei drehende Rollen geschlungenes Riemchen gegen die Oberfläche des Lieferwerks 12 gedrückt.The following applies to the exemplary embodiment according to FIG. 4: the supply spool 1 with a thermoplastic thread 1, for example nylon, perlon, polyester, is plugged onto a drain mandrel 3 on the gate 2, which is only partially shown. The thread is guided through the centrally arranged top thread guide 4 and drawn off by a feed mechanism 5. The Delivery unit 5 is driven by motor 7. The thread is pressed by the pressure roller 6, which is under spring force, against the surface of the delivery mechanism 5. After the deflections 8, the thread is guided over a heating plate 9 and a subsequent cooling plate 10 before it runs into the false twister 11 - indicated here as a friction false twister with a plurality of disks which are attached to three rotating axes. The thread is withdrawn from the false twist zone by the delivery mechanism 12. The delivery mechanism 12 is driven by the motor 13. The thread is pressed against the surface of the delivery mechanism 12 by a strap looped over two freely rotating rollers.

Auf der Vorlagespule 14 befindet sich ein Elastanfaden. Es handelt sich dabei um einen hochelastischen, gummiähnlichen, elastomeren Endlosfaden. Die Spule 14 ist in einer Schwinge 17 am Gatter 2 gelagert und liegt mit ihrem Umfang auf einer Treibwalze 15 auf. Die Treibwalze 15 wird durch den Motor 16 derart angetrieben, daß der Elastanfaden abgewickelt wird. Der Elastanfaden wird über die Umlenkrolle 18 getrennt von und parallel zu dem thermoplastischen Faden in das Lieferwerk 12 geführt.There is an elastane thread on the supply spool 14. It is a highly elastic, rubber-like, elastomeric continuous thread. The coil 14 is mounted in a rocker 17 on the gate 2 and lies with its circumference on a drive roller 15. The drive roller 15 is driven by the motor 16 such that the elastane thread is unwound. The elastane thread is guided via the deflection roller 18 separately from and parallel to the thermoplastic thread into the feed mechanism 12.

Erst in oder vorzugsweise hinter dem Lieferwerk 12 werden die Fäden zusammengeführt und gelangen sodann in die Blasdüse 19. Bei dieser Blasdüse 19 handelt es sich um eine Tangeldüse. Die Funktion der Tangeldüse besteht darin, zwischen den einzelnen Filamenten der beiden Fäden Verknotungen zu bilden, die sich in mehr oder weniger regelmäßiger Folge wiederholen. Hinter der Tangeldüse 19 wird der nunmehr kombinierte Faden über eine Ölwalze 20 geführt, die durch den Motor 22 mit niedriger Geschwindigkeit angetrieben wird. Anschließend wird der Faden über eine Umlenkung 23 und eine nicht dargestellte Changiereinrichtung der Aufwickelspule 24 zugeführt. Die Aufwickelspule 24 liegt auf der Treibwalze 25 auf und wird mit einer vorgegebenen konstanten Geschwindigkeit durch den Motor 26 angetrieben. Vorzugsweise wird auch hier das gestrichelt gezeichnete Abzugswerk 31 zwischen der Tangeldüse 19 und der Aufwicklung 24,25 vorgesehen. Die Geschwindigkeit des Abzugswerks 31 ist unabhängig von der Geschwindigkeit der anderen Fadenlieferwerke und der Treibwalzen 15 bzw. 25 einstellbar.Only in or preferably behind the feed mechanism 12 are the threads brought together and then get into the blowing nozzle 19. This blowing nozzle 19 is a tangel nozzle. The function of the Tangel nozzle is to form knots between the individual filaments of the two threads, which are repeated in a more or less regular sequence. Behind the tangel nozzle 19 the now combined thread is passed over an oil roller 20 which is driven by the motor 22 at low speed. The thread is then fed to the take-up spool 24 via a deflection 23 and a traversing device, not shown. The take-up reel 24 lies on the drive roller 25 and is driven by the motor 26 at a predetermined constant speed. Preferably, the drawing mechanism 31 shown in broken lines is also provided between the tang nozzle 19 and the winding 24, 25. The speed of the draw-off mechanism 31 can be set independently of the speed of the other yarn feed mechanisms and the drive rollers 15 and 25.

Zum Verfahren:
Der thermoplastische Faden ist lediglich vororientiert. Er wird zwischen den Lieferwerken 5 und 12 verstreckt. Daher wird das Lieferwerk 12 im Verhältnis zum Lieferwerk 5 mit einem Geschwindigkeitsverhältnis von 1,1:1 bis 2:1 angetrieben. Dabei stellt sich vor dem Lieferwerk 12 eine Fadenspannung von 0,3 bis 0,8 cN/dtex ein. Die Treibwalze 15 der Vorlagespule 14 für den Elastanfaden wird mit einer deutlich geringeren Umfangsgeschwindigkeit als das Lieferwerk 12 angetrieben. Das Geschwindigkeitsverhältnis liegt zwischen 1:2 und 1:4. Die Fadenspannung des Elastanfadens liegt daher vor dem Lieferwerk 12 zwischen 0,1 und 0,4 cN/dtex.About the procedure:
The thermoplastic thread is only pre-oriented. It is stretched between the delivery plants 5 and 12. The delivery mechanism 12 is therefore driven in relation to the delivery mechanism 5 at a speed ratio of 1.1: 1 to 2: 1. A thread tension of 0.3 to 0.8 cN / dtex is established in front of the delivery mechanism 12. The drive roller 15 of the supply spool 14 for the elastane thread is driven at a significantly lower peripheral speed than the feed mechanism 12. The speed ratio is between 1: 2 and 1: 4. The thread tension of the elastane thread is therefore between 0.1 and 0.4 cN / dtex in front of the delivery mechanism 12.

Wenn das Abzugswerk 31 nicht vorhanden ist, liegt die Geschwindigkeit der Treibwalze 25 für die Aufwickelspule 24 niedriger als die Geschwindigkeit des Lieferwerks 12 und zwar vorzugsweise zwischen 4 und 10% niedriger. Falls das Abzugswerk 31 vorgesehen wird, gelten diese Geschwindigkeitsverhältnisse für das Lieferwerk 12 und das Abzugswerk 31.If the take-off mechanism 31 is not present, the speed of the drive roller 25 for the take-up reel 24 is lower than the speed of the supply mechanism 12, preferably between 4 and 10% lower. If the withdrawal mechanism 31 is provided, these speed ratios apply to the delivery mechanism 12 and the withdrawal mechanism 31.

Die relative Fadenspannung bei der Aufwicklung ist sehr gering, da die Zugkräfte hier lediglich durch den Elastanfaden-Anteil des Kombinationsfadens aufgenommen werden, der Titer jedoch im wesentlichen gleich der Summe der Einzeltiter ist. Der Abfall der relativen Fadenspannung ergibt sich schon daraus, daß die absolute Fadenspannung des Elastanfadens vor dem Lieferwerk 12 bzw. 28 in einem Beispiel 7 cN betrug, während die absolute Fadenspannung des Kombinationsfadens hinter der Tangeldüse 5 cN ausmacht.The relative thread tension during winding is very low, since the tensile forces are only absorbed by the elastane thread portion of the combination thread, but the titer is essentially equal to the sum of the individual titer. The drop in the relative thread tension results from the fact that the absolute thread tension of the elastane thread in front of the feed mechanism 12 or 28 was 7 cN in one example, while the absolute thread tension of the combination thread behind the tangle nozzle is 5 cN.

Zwischen dem Lieferwerk 12 und der Aufwicklung 24,25 kann der Faden vor der Blasdüse oder vorzugsweise nach der Blasdüse 19, vorzugsweise vor dem Abzugswerk 31, noch durch eine Heizeinrichtung geführt werden, um eine Beruhigung der Torsionsneigung des zuvor ausgezwirnten thermoplastischen Fadens herbeizuführen.Between the feed mechanism 12 and the winding 24, 25, the thread can be passed through a heating device in front of the blowing nozzle or preferably after the blowing nozzle 19, preferably before the take-off mechanism 31, in order to calm the tendency to twist of the previously twisted thermoplastic thread.

Als thermoplastische Fäden kommen insbesondere Polyester, Nylon oder Perlon in Betracht.Polyester, nylon or perlon are particularly suitable as thermoplastic threads.

Die Fäden werden erst in oder kurz vor der Tangeldüse 19 zusammengeführt, da es sonst zu einer Verbindung der beiden Fäden kommt, die durch die Kräuselneigung des zuvor falschzwirn-texturierten Fadens hervorgerufen wird und die das Bild des Gesamtfadens stört. Andererseits zeigt sich, daß die Zusammenführung des Elastanfadens und des thermoplastischen Fadens erst so spät wie möglich, vorzugsweise erst nach dem die Falschzwirnzone 9-11 abschließenden Lieferwerk 12 bewirkt werden darf, wenn man eine Verbindung der beiden Fäden durch die Kräuselneigung des thermoplastischen Fadens verhindern will.The threads are brought together only in or shortly before the tangle nozzle 19, since otherwise there is a connection of the two threads, which is caused by the tendency of the previously false-twisted textured thread to curl and which interferes with the image of the overall thread. On the other hand, it turns out that the elastane thread and the thermoplastic thread can only be brought together as late as possible, preferably only after the delivery mechanism 12 which closes the false twist zone 9-11, if one wants to prevent the two threads being connected by the tendency of the thermoplastic thread to curl .

Schließlich zeigt sich auch, daß der thermoplastische Faden der Tangeldüse 19 mit einer Geschwindigkeit zugeführt werden muß, die zu einer weitgehenden Entspannung des thermoplastischen Fadens in der Zone der Zusammenführung führt. Geschieht dies nicht, so nimmt der dehnungsarme thermoplastische Faden nicht an der Verzwirnung und Verknotung durch die Luftstrahlbehandlung teil und die Vermischung und Verknotung der Fäden wird weniger intensiv. Andererseits muß die Entspannung des Verbundfadens begrenzt bleiben, damit es nicht zu einer Störung des Verfahrens kommt. Die Aufwickelgeschwindigkeit muß demgegenüber so hoch gewählt werden, daß weder sehr weiche, nicht-stabile, unbrauchbare Spulen 24 noch unerträglich harte Spulen 24 mit Fadenschädigungen entstehen.Finally, it is also shown that the thermoplastic thread must be fed to the tangle nozzle 19 at a speed which leads to extensive relaxation of the thermoplastic thread in the zone of the merging. If this does not happen, the low-stretch thermoplastic thread does not take part in the twisting and knotting by the air jet treatment, and the mixing and knotting of the threads becomes less intensive. On the other hand, the relaxation of the composite thread must remain limited so that the process is not disturbed. In contrast, the winding speed must be chosen so high that neither very soft, unstable, unusable bobbins 24 nor unbearably hard bobbins 24 with thread damage are produced.

In Fig. 5 ist eine geeignete Spreizdüse im Längsschnitt gezeigt, die im Verfahrensablauf nach Fig. 2 oder 3 verwandt werden kann.5 shows a suitable expansion nozzle in longitudinal section, which can be used in the process sequence according to FIG. 2 or 3.

Ein Fadenröhrchen 43 ist mit seinem unteren Ende in einem Montageblock 39 befestigt. Der Druckluftanschluß 38 mündet in einen Sammelraum 51, welcher sich in zwei Druckluftkanälen 49 fortsetzt. Die beiden Druckluftkanäle 49 schmiegen sich an den Außenumfang des Fadenröhrchens an. Dabei ist ihr Durchmesser kleiner als der des Fadenröhrchens. Die innere Begrenzung der Druckluftkanäle wird durch die Außenwandung des Fadenröhrchens gebildet. Die Druckluftkanäle liegen sich bezüglich des Fadenröhrchens diametral gegenüber. Die Außenwandungen der Druckluftkanäle sind bezüglich der Axialrichtung des Fadenröhrchens konvergent und bilden einen Querschnitt mit minimaler Weite 46.
Die Kanäle 49 treten in die freie Umgebung aus. Dabei sind die Kanäle und das Fadenröhrchen 43 auf eine Engstelle 44 gerichtet. Das Fadenröhrchen 43 sowie die beiden Druckluftkanäle 49 sind zusammen mit den Mittelpunkten M der beiden Kugeln 42 und der Engstelle 44 in derjenigen Ebene angeordnet, in welcher der Endlosfaden geführt und in seine Einzelfilamente 9 aufgespreizt wird.A thread tube 43 is fastened with its lower end in a mounting block 39. The compressed air connection 38 opens into a collecting space 51, which continues in two compressed air channels 49. The two compressed air channels 49 nestle against the outer circumference of the thread tube. Their diameter is smaller than that of the thread tube. The inner boundary of the compressed air channels is formed by the outer wall of the thread tube. The compressed air channels are diametrically opposed with respect to the thread tube. The outer walls of the compressed air channels are convergent with respect to the axial direction of the thread tube and form a cross section with a minimum width 46.
The channels 49 emerge into the free environment. The channels and the thread tube 43 are directed to a constriction 44. The thread tube 43 and the two compressed air channels 49 are arranged together with the center points M of the two balls 42 and the constriction 44 in the plane in which the continuous thread is guided and spread out into its individual filaments 9.

Claims (12)

  1. Method of manufacturing a composite yarn from a low-extension yarn (1) and an elastane yarn (14) whose extensibility differs by a multiple, wherein the yarns (1, 14) are brought together and intertwisted by air jet treatment (19), the low-extension yarn being subjected to a spreading treatment in the thread run upstream of the point of intertwisting with the elastane yarn,
    characterized in that
    the spreading treatment is effected by drawing the low-extension yarn (1) under tension over an edge or bezel (34), by false twisting (11) and unravelling of the false twist or by conveying through a fluid nozzle (32).
  2. Method according to claim 1,
    characterized in that
    the bringing together of the yarns (1, 14) is effected upstream and the intertwisting (19) is effected downstream of the delivery mechanism (12), by means of which the low-extension yarn (1) is withdrawn from the spreading treatment (11; 32; 34).
  3. Method according to claim 1 or 2,
    characterized in that,
    in the case of spreading treatment by false twisting (11), the bringing together of the yarns (1, 14) is effected during or immediately after unravelling of the false twist.
  4. Method according to one of claims 1 to 3,
    characterized in that
    the low-extension yarn (1) is withdrawn from the false twisting unit (11) at a yarn tension between 0.2 and 0.6 cN/dtex.
  5. Method according to claim 1 or 2,
    characterized in that
    the spreading treatment is effected after bringing together of the yarns (1, 14).
  6. Method according to one of claims 1 to 5,
    characterized in that
    the elastane yarn (14) on being brought together with the low-extension yarn (1) is tensioned at a yarn tension between 0.1 and 0.3 cN/dtex.
  7. Method according to one of claims 1 to 6,
    characterized in that
    the composite yarn (24) is withdrawn from the air jet treatment (19) at a withdrawal speed which is at least 3% and in particular 6 to 9% lower than the combined feed rate of the two yarns (1, 14) to the air jet treatment (19).
  8. Method according to claim 7,
    characterized in that
    the composite yarn (24) is withdrawn from the air jet treatment (19) by a delivery mechanism (31) disposed upstream of the take-up (24, 25).
  9. Method according to one of claims 1 to 9,
    characterized in that
    the air jet treatment is effected by a snarling nozzle (tangle nozzle) (19).
  10. Method according to one of claims 1 to 9,
    characterized in that
    the air jet treatment (19) is effected by one or two air jets which are directed towards the brought-together yarns (1, 14) at right angles to the yarn feed direction with a direction component in yarn feed direction.
  11. Method according to one of claims 1 to 10,
    characterized in that
    the elastane yarn (14) is unwound from a feed spool (14) which is driven at a predetermined constant peripheral speed.
  12. Method according to one of claims 1 to 11,
    characterized in that
    the elastane yarn (14) is withdrawn by a delivery mechanism (28) from the feed spool (14), brought together with the low-extension yarn (1) and fed jointly with said yarn to the air jet treatment (19), the combined speed of withdrawal from the air jet treatment (19) being higher than, in particular more than twice as high as, the speed of withdrawal of the elastane yarn (14) from its feed spool (14).
EP89118903A 1988-10-15 1989-10-11 Method for making a composite yarn Expired - Lifetime EP0364874B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3835138 1988-10-15
DE3835138 1988-10-15
DE3841740 1988-12-10
DE3841740 1988-12-10

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EP0364874A3 EP0364874A3 (en) 1990-12-12
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DE7520319U (en) * 1975-06-26 1976-04-01 Barmag Barmer Maschinenfabrik Ag, 5600 Wuppertal COMPRESSION CURLING DEVICE FOR THERMOPLASTIC FEEDS
JPS5249367A (en) * 1975-10-15 1977-04-20 Mitsubishi Rayon Co Method of suedeelike knitted woven goods
US4341063A (en) * 1980-08-26 1982-07-27 Milliken Research Corporation Air textured yarns
DE3789006T2 (en) * 1986-11-26 1994-09-01 Fadis Spa Air-blending machine for various yarns.

Also Published As

Publication number Publication date
EP0364874A2 (en) 1990-04-25
US5008992A (en) 1991-04-23
DE58905762D1 (en) 1993-11-04
EP0364874A3 (en) 1990-12-12

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