EP1527219A1

EP1527219A1 - Method and device for spinning and texturing synthetic threads

Info

Publication number: EP1527219A1
Application number: EP03792205A
Authority: EP
Inventors: Bernd Kirchhoff
Original assignee: Saurer GmbH and Co KG
Current assignee: Oerlikon Textile GmbH and Co KG
Priority date: 2002-08-08
Filing date: 2003-07-16
Publication date: 2005-05-04
Also published as: WO2004018750A1; DE10236359A1

Abstract

The invention relates to a method and a device for spinning and texturing synthetic multifilament threads. At least one thread is spun from a polymer melt, cooled, textured and wound into a reel. In order to compensate possible irregularities in the texturing, the thread is textured at least a second time, after the first texturing and before the winding.

Description

Method and device for spinning and texturing synthetic threads

The invention relates to a method for spinning and texturing synthetic multifilament threads according to the preamble of claim 1 and an apparatus for carrying out the method according to the preamble of claim 9.

A generic method and a generic device for spinning and texturing synthetic multifilament threads is known from DE 199 29 817 AI.

For producing a crimped yarn a plurality of strangfö ^'shaped filaments is first extruded by means of a spinning device of a thermoplastic melt. After cooling, the filament sheet is brought together to form the thread. The thread is then textured using a texturing device. Here, the individual filaments of the thread are deformed into loops and arches, so that the thread formed from the filament bundle has a crimp after texturing. In order to achieve such a change in the shape of the filaments of the thread, the texturing device contains a stuffer box, in which the thread is compressed into a thread stopper by means of a conveying means. When the filaments of the thread strike the thread plug within the stuffer box, the desired loops and arches of the individual filaments are created. In order to achieve the most stable crimp possible, the thread is preferably passed through a hot conveying medium and heated at the same time, so that a plastic change in shape can take place in the individual filaments of the thread. After texturing, the thread plug is released into the crimped thread and the thread is wound into a bobbin. The intensity and stability of the crimping of the thread is largely determined by the change in shape of the individual filaments, ie when using a stuffer box, by the plug formation and the dwell time of the thread plug within the stuffer box. In particular, the condition of the stuffer box and the texturing parameters such as temperature and pressure of a conveying medium additionally influence the crimping result. For a uniform crimp, the texturing parameters must therefore be kept constant, but this is hardly possible in practice due to tolerances. It was observed, for example, that an uneven discharge of the thread plug from the stuffer box resulted in an uneven crimp in the thread. Such irregularities in the ripple lead to undesirable streaks in a subsequently produced fabric such as a carpet.

It is an object of the invention to further develop the generic method and the generic device of the type mentioned at the outset in such a way that a synthetic multifilament thread with stable and very uniform crimp can be produced.

According to the invention, this object is achieved in that the thread is post-textured at least a second time in a treatment zone after texturing and before winding. The crimping of the thread is thus introduced into the thread in several stages. This results in a very high leveling of the crimp in the thread.

The invention was also not suggested by the known methods and devices from EP 0 861 931 and EP 0 485 871, since the known methods and devices only concern the production of a composite thread from several partial threads. Each of the part threads is different in its polymer, its color and / or its treatment. Each thread is formed from a bundle of filaments. each Filament bundle receives individual treatment. In contrast, the method and the device according to the invention are directed to producing a thread from a filament bundle of a monochromatic polymer melt. The invention is particularly characterized in that the crimped thread receives a high crimp, which is higher compared to conventionally crimped threads. Due to the multi-stage texturing of the thread, the individual filaments are treated particularly intensively during texturing. The high crimping leads to a large bulk of the thread, which is particularly notable in the case of yarns for the production of carpets.

In principle, all known texturing methods can be used for texturing the thread in several stages. However, the texturing methods based on the stuffer box principle are particularly advantageous. In this case, the thread cannot be called into a stuffer box either for pre-texturing or for post-texturing or for pre-texturing and post-texturing, and it can be pushed up to a thread plug. Then the thread plug is released to the partially textured thread or to the finally textured thread.

For intensive texturing, it is also proposed to force the thread into the stuffer box through a heated fluid. A very pronounced crimp in the filament can be achieved by the thermal treatment of the thread. In order to maintain the intensity of the texturing, the thread stopper is then cooled by a cooling medium before being dissolved.

To adjust the physical properties of the thread, in particular the elongation and the strength, the thread is preferably drawn after spinning and before pre-texturing. There is the possibility here that the thread undergoes pre-stretching before the first texturing stage and post-stretching before the second texturing stage. To improve the crimping results and to increase the thread closure of the individual filaments in the thread, the thread can advantageously be carried out before and / or after the post-texturing of an additional treatment in the form of a swirl.

The method according to the invention is also suitable for joining the thread textured in several stages with a further thread to form a composite thread. For example, special fancy yarns or multicolor yarns can be produced. The additional thread or threads can in principle be added to the thread before texturing, between the texturing stages or after texturing.

A particularly advantageous variant of the method can also be achieved by first pre-texturing several threads in the first texturing stage independently of one another, and then subsequently combining them into a composite thread in the post-texturing.

The method according to the invention is particularly suitable for producing threads or composite threads that have completely new yarn effects. For example, colored threads can be produced with a very high covering power, which thus directly leads to material savings in a further development of a flat fabric such as a carpet.

A device according to the invention having the features of claim 9 is proposed for carrying out the method. A second post-texturing device is arranged in the thread path between the texturing device and the winding device, so that the thread is textured several times from spinning to winding.

The texturing devices are preferably designed the same. In order to texture the thread according to the stuffer box principle, both the The pre-texturing device and the post-texturing device each have a conveying means and a stuffer box interacting with the conveying means. In principle, however, it is also possible for the post-texturing device and the pre-texturing device to be designed differently in order to combine different texturing methods with one another.

In order to texture the thread according to the stuffer box principle, the thread is preferably fed into the stuffer box through a conveying nozzle by means of a preferably heated pressure fluid. For the temperature control of the thread plug, a cooling device is arranged downstream of the stuffer box, by means of which the crimp is fixed.

In order to be able to complete the texturing process in each stage according to the stuffer box principle, a take-off godet is arranged after each stuffer box or each cooling device of the texturing device, so that the thread can be pulled out of the thread plug.

Additional treatment devices such as godets, godet units, cooling devices or swirling devices are provided for additional treatments of the thread before texturing, between the pre- and post-texturing or after the last texturing. This ensures a high degree of flexibility in the production of crimped yarns by the method according to the invention.

The method according to the invention is described in more detail below with the aid of some exemplary embodiments of the device according to the invention and further advantages are shown.

They represent: Fig. 1 shows schematically a first embodiment of the device according to the invention

Fig. 2 schematically shows another embodiment of the device according to the invention

Fig. 3 schematically shows another exemplary embodiment of the device according to the invention

1 schematically shows a first exemplary embodiment of a device according to the invention for carrying out the method according to the invention. The device has a spinning device 1, which is connected via a melt feed 3 to a melt generator, for example a pump or an extruder (not shown here). The spinning device 1 has a spinning head 2 which contains at least one spinneret 4 on the underside. The spinneret 4 has a multiplicity of nozzle bores through which the polymer melt supplied to the spinning head 2 is extruded under pressure to form a multiplicity of individual filaments 6. Below the spinning device 1, a cooling shaft 5 is provided, through which the filaments 6 are guided, so that the filaments emerging at approximately the melt temperature are cooled. For this purpose, the cooling shaft 5 could, for example, be connected to a crossflow blower through which a cooling air is blown essentially transversely onto the filaments 6. •

A thread guide 20 and a preparation device 19 are arranged in the outlet region of the cooling shaft 5. A preparation agent is applied to the filaments 6 by the preparation device 19, so that the filaments 6 join together to form the thread 10. The thread 10 or the filaments 6 are drawn off from the spinneret 4 by an inlet godet unit 14 arranged below the cooling shaft 5. The Inlet godet unit 14 is formed from a godet and an overflow roller, which are looped several times by the thread 10.

The following treatment facilities are listed one after the other based on the thread path. The inlet godet unit 14 is followed by a godet duo 15.1 and a pre-texturing 7. The godet duo 15.1 is preferably formed from two heated stretch godets which are wrapped several times by the thread. The pre-texturing 7 consists of a delivery nozzle 9.1, which is connected to a pressure source, not shown here. A stuffer box 11.1 directly adjoins the delivery nozzle 9.1. A deflection roller 21 is arranged at a distance on the outlet side of the stuffer box 11.1. The deflection roller 21 is followed by a second godet duo 15.2, which is connected upstream of the post-texturing 8. The post-texturing 8 is formed by a delivery nozzle 9.2 and a stuffer box 11.2. The delivery nozzle 9.2 is connected to a pressure source. Two conveyor rollers 22 are assigned to the outlet of the stuffer box 11.2.

A cooling device 12 is provided at a distance below the conveyor rollers 22. The cooling device 12 is designed as a cooling drum. The extractor godets 16.1 and 16.2 are arranged downstream of the cooling device 12. A swirling device 23 is provided between the discharge godet units 16.1 and 16.2. A take-up device 17 is arranged downstream of the take-off godet unit 16.2.

In the embodiment of the device according to the invention shown in FIG. 1, after spinning, the thread 10 is drawn off from the spinning device 1 by the inlet godet unit 14 and fed to the godet duo 15.1. The godet duo 15.1 is formed from two stretch godets, which are preferably designed to be heated and are driven at a differential speed to stretch the thread 10. After the thread 10 has been stretched, the godet duo 15.1 turns it into Vortexturiereinrichtung 7 performed. In the pre-texturing device 7, the thread 10 is conveyed through the conveying nozzle 9.1 by means of a conveying medium into the stuffer box 11.1 arranged below the conveying nozzle 9.1 and swaged into a thread stopper 13.1. The thread plug 13.1 is discharged from the stuffer box 11.1 and released via a deflection roller 21 by means of a downstream godet duo 15.2 to the thread 10. The thread 10 is pre-textured after the thread plug 13.1 has been dissolved, ie the filaments of the thread b 10 have a crimp. The second godet duo 15.2 is in turn preferably formed from two heated godets, which are preferably driven at a low differential speed in order to easily stretch the thread 10 again. The thread 10 is then drawn off from the godet duo 15.2 by the post-texturing device 8. For this purpose, the thread 10 is conveyed by means of a conveying medium, preferably heated air, by means of the conveying nozzle 9.2 and upset into the subsequent stuffer box 11.2 to form a thread plug 13.2. The conveyor rollers 22 are arranged below the stuffer box 11.2, through which the thread plug 13.2 is guided out of the stuffer box 11.2. The thread plug 13.2 is then guided to the cooling device 12. The cooling device 12 is designed as a cooling drum, on the circumference of which the thread plug 13.2 is guided. For this purpose, the cooling drum has a sieve-shaped jacket through which a flow of cooling air flows. After the thread plug 13.2 has cooled, it is released by the take-off godet unit 16.1 via the thread 10. After the cooling device 12, the thread 10 contains the final texturing.

Before winding, the thread 10 is guided through the intermingling device 23 by means of the take-off godet unit 16.2. An air flow is applied to the textured thread within the interlacing device 23, so that there is an improved bond between the crimped filaments. The textured thread 10 is then wound into the bobbin 18 in the winding device 17.

To produce the crimp in the thread 10, the pre-texturing and the post-texturing could be carried out with different texturing parameters. For example, in the pre-texturing device 7, the delivery nozzle 9.1 can be operated with a non-heated delivery medium. The thread warmed by the godet duo 15.1 would then be upset to the thread plug 13.1 by means of the non-heated conveying medium. In contrast, the thread 10 can preferably be loaded with a heated conveying medium in the post-texturing.

The device shown in Fig. 1 can be supplemented by additional devices for additional treatment of the thread 10. For example, a further preparation device 19 (shown in dashed lines) could be arranged upstream of the godet duo 15.1 in order to receive an order of preparation that is optimized for the stretching of the thread. In addition, the deflecting roller 21 arranged downstream of the pre-texturing device 7 could be replaced by a cooling device corresponding to the cooling device 12. This variation is particularly advantageous if the pre-texturing is operated with a hot medium. Furthermore, there is also the possibility of additionally intermingling the thread 10 before re-texturing. For this purpose, a second swirling device 23 (shown in broken lines) is arranged downstream of the deflection roller 21 in FIG. 1.

2 shows a further exemplary embodiment of a device according to the invention for carrying out the method according to the invention. The exemplary embodiment is essentially identical to the previous exemplary embodiment, so that reference is made to the preceding description and only the differences are explained at this point. In order to texturize a thread 10 drawn off by the inlet godet unit 14.1 after spinning, a godet duo 15.1, the pre-texturing device 7, the cooling device 12.1, a second godet duo 15.2, the post-texturing device 8, a second cooling device 12.2, the take-off godet units 16.1 and 16.2 are included in the thread run the swirling device 23 and the winding device 17. The structure of the listed treatment facilities is identical to that of the previous exemplary embodiments.

In addition to the spinning device 1, the device contains a bobbin holder 27 with a supply bobbin 24. An additional thread 25 is wound on the supply bobbin 24. The additional thread 25 could be presented as a fully or partially stretched thread. An inlet godet unit 14.2 is assigned to the bobbin holder 27, through which the additional thread 25 is drawn off from the supply bobbin 24 via a thread guide 26. The inlet godet unit 14.2 guides the additional thread 25 on the circumference of a godet and an overflow roller in several loops to the post-texturing device 8. The feed thread 9.2 of the post-texturing device 8 pulls the additional thread 25 from the inlet godet unit 14.2 and then brings it together with the thread 10 and together to form a thread stopper 13.2 compressed.

To produce a composite thread 28, a first thread 10 is first melt-spun by the spinning device 1 and then drawn and pre-textured. After the pre-texturing, the thread 10 is brought together with the additional thread 25 and swaged in the post-texturing 8 for the thread plug 13.2. After the thread plug 13.2 has been released, the composite thread 28 is guided through the intermingling device 23 and then wound up to the bobbin 18.

Another alternative to the production of a composite thread 28 could be given in that the additional thread 25 is only after the multilevel texturing of the Thread 10 is fed to the thread 10. The connection between the two threads 10 and 25 would advantageously take place through the intermingling device 23. However, the composite could also be produced by other suitable composite processes.

A further alternative to the production of a composite thread 28 could be given in that the additional thread 25 is produced parallel to the thread 10 by a separate spinning device. The additional thread could then be fed to the texturing device 8 either via a godet unit and a godet duo or with the inclusion of a godet duo.

3 shows a further exemplary embodiment of a device according to the invention for carrying out the method according to the invention. The exemplary embodiment is preferably suitable for producing a composite thread 28 from two or more spun individual threads 10.1, 10.2. In addition to the use of uniform polymers, production with polymers of different viscosities, such as PP1 and PP2 or PA61 and PA62, would also be possible. For this purpose, the spinning device 1 has two spinnerets 4.1 and 4.2 on the underside of the spinning head 2. Each of the spinnerets 4.1 and 4.2 is assigned a thread guide 20 and a preparation device 19 in order to connect the extruded filaments 6 to the threads 10.1 and 10.2 after passing through the cooling shaft 5. The thread 10.1 is drawn off from the spinneret 4.1 by the inlet godet unit 14.1 and drawn by means of the stretch godet unit 29.1 and guided to the pre-texturing device 7. The thread 10.2 is drawn in parallel through the second inlet godet unit 14.2 from the spinneret 4.2 and is guided to the pre-texturing device 7 by means of the second stretch godet unit 29.2. The pre-texturing device 7 has a multi-thread feed nozzle 30 and a multi-thread stuffer box 31. The multi-thread feed nozzle 30 preferably has two parallel thread channels in order to convey the threads 10.1 and 10.2 in parallel next to one another and to each lead into an associated stuffer box of the multi-thread stuffer box 31. Consequently two parallel thread plugs 13.1 and 13.2 can be formed. The thread plugs 13.1 and 13.2 are then guided around the circumference of the cooling device 12.1 and cooled by a cooling medium. Then the thread plugs 13.1 and 13.2 become threads 10.1. and 10.2 dissolved and connected to a composite thread 28 by the interlacing device 23.1. The composite thread is passed over the godet duo 15.2 in several loops and taken over by the post-texturing device 8. In the post-texturing device 8, the composite thread 28 is swaged into a thread plug 13.3 and then cooled in the cooling device 12.2. Before winding the composite thread 28 into a bobbin 18, the composite thread 28 is swirled a second time in the swirling device 23.2, which is arranged between the take-off godet units 16.1 and 16.2.

The exemplary embodiments shown in FIGS. 1, 2 and 3 for carrying out the method according to the invention are exemplary in their arrangement and their choice of treatment device. In this way, additional pre-treatment or post-treatment stages can be introduced, for example in order to be able to carry out additional treatments on the thread before texturing, between pre-texturing and post-texturing, or after post-texturing. The condition and design of the pre-texturing device and the post-texturing device are also exemplary. To set certain ripples, the pre-texturing and the post-texturing can be carried out with different parameters or with different methods. It is essential here that the texturing is carried out in several stages in succession. The particular advantage of the invention is also given in that higher process speeds for the production of crimped threads can be realized. Non-uniformities due to high speed in texturing have no effect in the method according to the invention. If necessary, additional intermingling of the thread introduced before winding for the purpose of producing the thread closure can also be omitted. The invention thus enables a high degree of flexibility in the production of crimped threads, which are characterized in particular by high crimping and very high uniformity of the texturing.

LIST OF REFERENCE NUMBERS

1 spinning device

2 spinning head

3 melt feed

4, 4.1, 4.2 spinneret

5 cooling shaft

6 filament

7 pre-texturing device

8 post-texturing device

9.1, 9.2 delivery nozzle

10, 10.1, 10.2 thread

11.1, 11.2 stuffer box

12, 12.1, 12.2 cooling device

13.1, 13.2, 13.3 thread plug

14, 14.1, 14.2 inlet godet unit

15.1, 15.2 godet duo

16.1, 16.2 trigger godet unit

17. Winding device

18. Coil

19. Preparation device

20. Thread guide

21. Deflection roller

22. Conveyor rollers

23, 23.1, 23.2 swirling device

24 supply spool

25 additional thread

26 thread guide

27 spool holder

28 composite thread 9.1, 29.2 Expanding godet unit 0 multi-thread delivery nozzle 1 multi-thread stuffer box

Claims

claims

1. A method for spinning and texturing synthetic threads, in which at least one thread is spun from a polymer melt, cooled, textured and wound into a bobbin, characterized in that the thread after texturing (pre-texturing) and before winding at least a second Times is textured.

2. The method according to claim 1, characterized in that the thread is required for pre-texturing and / or for post-texturing in a stuffer box, upset to a thread plug and dissolved as a textured thread.

3. The method according to claim 2, characterized in that the thread is conveyed by a heated fluid in the stuffer box and that the thread plug is cooled by a cooling medium before dissolving.

4. The method according to any one of the preceding claims, characterized in that the thread is pre-drawn before pre-texturing and post-drawn before post-texturing.

5. The method according to any one of claims 1 to 4, characterized in that the thread is swirled before and / or after the texturing.

Method according to one of claims 1 to 5, characterized in that the thread is pre-textured with at least one further thread to form a composite thread and that the composite thread is textured before winding.

7. The method according to claim 6, characterized in that the composite thread is formed before the pre-texturing.

8. The method according to claim 6 or 7, characterized in that the composite thread is formed by swirling or by texturing the threads.

9. Device for performing the method according to one of claims 1 to 8, with a spinning device (1), a cooling shaft (5), a texturing device (7) and a winding device (17), characterized in that in the thread path between the texturing device ( 7) (pre-texturing device) and the winding device (17) a second post-texturing device (8) is arranged.

10. The device according to claim 9, characterized in that the post-texturing device (8) has a conveyor (9.2) and with the conveyor (9.2) cooperating stuffer box (11.2).

11. The device according to claim 9 or 10, characterized in that the pre-texturing device (7) a funding (9.1) and one with the

Funding means (9.1) cooperating stuffer box (11.1).

12. The apparatus of claim 10 or 11, characterized in that the conveying means is formed by a conveying nozzle (9.1) which is connected to a pressure source, and that the stuffer box (11.1, 11.2) one

Cooling device (12.1, 12.2) is arranged downstream, by means of which a thread plug (13.1, 13.2) emerging from the stuffer box (11.1, 11.2) can be cooled.

13. Device according to one of claims 10 to 12, characterized in that the stuffer box (11.1) or the cooling device (12.2) one Subtraction godet (15.2, 16.1) is arranged downstream, through which the thread (10) is pulled out of the thread plug (13).

14. Device according to one of claims 9 to 13, characterized in that between the cooling shaft (5) and the pre-texturing device (7) a plurality of godets (14, 15.1) are arranged, through which at least one thread (10) from the spinning device (1 ) is pulled off and stretched.

15. Device according to one of claims 9 to 13, characterized in that between the pre-texturing device (7) and the

Post-texturing device (8) a plurality of godets (15.2) are arranged, through which at least one thread (10) is post-stretched.

16. The device according to one of claims 9 to 15, characterized in that a swirling device (23) in the thread course

Post-texturing device (8) is arranged downstream.

17. Device according to one of claims 9 to 16, characterized in that a Vorverwirbelungseinri device (23.1) is arranged in the thread path between the pre-texturing device (7) and the post-texturing device (8).