EP2007935B1 - Method and apparatus for pulling off and drawing a multifilament thread - Google Patents

Description

The invention relates to a method for stripping and stretching a multifilament yarn during melt spinning according to the preamble of claim 1 and to an apparatus for carrying out the method according to the preamble of claim 10.

In the production of multifilament yarns in a melt-spinning process, it is known to draw the freshly spun multifilament yarns from the spinning device and, depending on the type of thread, to carry out a more or less high stretching and any further treatments to make the multifilament yarn into a package at the end of the treatments to be able to wind up. For pulling off and stretching the multifilament yarns usually godets are used, which have a driven guide shell, on the circumference at least one of the threads is guided with a Teilumschlingung. Depending on the desired stretching or stretching forces required for drawing, the guide shells of the godets are simply or repeatedly looped around by the thread.

From the DE 103 43 460 A1 For example, a generic method and a generic device is known, in which a multifilament yarn is drawn off and drawn through two driven godets arranged one behind the other in the yarn path. Such an arrangement is particularly suitable for producing so-called pre-oriented yarns (POY) with a low or partial stretching.

On the other hand, in order to produce fully stretched yarns, higher stretching forces are required, so that the yarn is guided on the guide casing of the godets with several wraps to avoid slip phenomena on the godets must become. For this purpose, the godet is assigned a loose role, such as from the DE 102 27 290 A1 is known. Depending on the number of thread wraps on the guide casing of the godets and depending on the number of simultaneously guided on the guide sheath threads thus long projecting godet systems are required.

Regardless of the amount of stretching forces, a minimum length of the thread piece of the thread stretched in a draw zone by two godets must be observed in order to carry out the drawing operation in the multifilament thread. So far, in the known method and the known device, the distance formed between the godets is determined essentially by the required length of the piece of thread.

It is an object of the invention to provide a method and a device for drawing and stretching a multifilament yarn of the generic type such that, regardless of the free stretching lengths of the yarn, very compact arrangements of the godets can be realized.

Another object of the invention is to provide a method and a device of the generic type, in which, or which high stretching forces can be realized even with simply looped godets for the production of fully drawn threads.

The object of the invention is achieved by a method having the features of claim 1 and by a device having the features of claim 10.

Advantageous developments of the invention are defined by the features and feature combinations of the respective subclaims.

The invention is characterized in that a tensioned between the godets piece of thread in its length can be selected independently of the arrangement of the godets each other. For this purpose, the piece of thread between the godets is guided as a thread loop, wherein the thread is guided at the loop end via a rotatable mounted deflection roller. Thus, long stretching zones can be realized for the thread piece stretched between the godets with a minimum distance between the godets. The device according to the invention has a rotatably mounted deflection roller in the yarn path between the godets, which determines the length of the thread loop and thus the total length of the clamped piece of thread between the godets with their distance from the godets. Due to the rotatably mounted deflection roller, no relative phenomena occur between the thread piece and the deflection roller, so that only the peripheral speeds of the godets for guiding the thread piece are decisive.

For the integration in a melt spinning process, the development of the invention is preferably used, in which the thread is guided with a wrap angle of> 120 ° on the circumference of at least one of the guide shells of the godets. Thus, both vertically oriented or horizontally oriented spinning processes for the production of synthetic threads can be realized. In this case, the deflection roller is held at the same distance centrally to the godets to form a symmetrical thread loop.

The development of the invention, in which the thread piece between the godets by a temperature and / or turbulence is treated, is particularly advantageous. Thus, the stretching of the thread, which is customary for stretching, can advantageously be carried out in the thread section between the godets and the deflection roller. Thus, the tempered with large losses tempering, in which the thread is performed in multiple wrapping on a heated guide shell of a galette, completely eliminated. The free stretches of the thread loop between the godets and the pulley can be used as far advantageous for the treatment of the thread.

For this purpose, the device according to the invention has a treatment device in the thread run between the deflection roller and at least one of the godets, so that either the thread section can be treated in the tapering section of the thread loop or in the running section of the thread loop. However, it is also possible to design the treatment device in such a way that both the tapered section of the thread loop before the deflection roller and the outgoing section of the thread loop behind the deflection roller are treated uniformly by a treatment device. Thus, the thread loop according to the invention between the godets leads to a high degree of flexibility in the design and arrangement of the treatment devices.

For temperature control of the piece of thread preferably a contactless heating is selected, in which the piece of thread is heated by an infrared radiator. Such tubular infrared radiators can be tuned in particular in their wavelength to the thread material, so that the temperature control can be carried out with high efficiency.

The heat treatment of the thread by an infrared radiator can be further improved by arranging a radiation transducer opposite the infrared radiator, wherein the thread is guided in the space between the radiation transducer and the infrared radiator. By means of the radiation converter, the infrared steels, which are not suitable in their wavelength, can be converted and utilized to heat the yarn. Thus, the yield of the infrared rays for heating the yarn can be significantly increased.

A particularly favorable arrangement can be achieved in that the overrun roller and the godets have a substantially uniform jacket diameter and that the radiant heater is arranged within the thread loop is. Thus, both pieces of thread of the thread loop can be irradiated simultaneously for heating. It also results in a very compact design.

Depending on the selected type of thread to be produced, the godets can be driven and controlled independently of one another with different circumferential speeds of the guide sheaths or together with substantially the same circumferential speeds. In this case, the godets are preferably assigned separate godet drives which can be controlled by a common control device or by separate control devices.

The development of the invention, in which the thread is guided for stretching over several pairs of godets, wherein on each of the pairs of godets the stretched between the godets piece of thread is guided as a loop of thread, is particularly suitable to produce fully drawn threads with multiple treatment levels. Thus, for example, a last godet pair can be assigned a heating device which tempers the thread loop between the godets to perform a shrinking treatment. Accordingly, the last galette of the godet pair is operated at a slightly lower peripheral speed than the godet loop upstream.

The melt spinning processes are usually operated in such a way that several threads are produced in parallel at the same time. Thus, the development of the invention is preferably used, in which a plurality of threads are simultaneously performed parallel to each other on the godets, so that the guide shells of the godets are formed correspondingly long. Here, the thread loops formed between the guide sheaths are preferably performed with a small distance in the range of 3 mm to 8 mm on the circumference of the deflection roller, so that even with a high number of threads, a very compact guide and arrangement can be maintained.

The method according to the invention and the device according to the invention are therefore particularly suitable for drawing off and drawing synthetic threads in a melt-spinning process. It is independent of whether textile threads, technical threads, crimped threads or composite threads are produced from the abovementioned individual threads or effect threads in the melt spinning process.

The method according to the invention is explained in more detail below with reference to some embodiments of the device according to the invention with reference to the attached figures.

Fig. 1

schematisch eine Ansicht eines ersten Ausführungsbeispiels der erfindungsgemäßen Vorrichtung in einem POY-Schmelzspinnprozess

Fig. 2

schematisch eine Ansicht eines weiteren Ausführungsbeispiels der erfindungsgemäßen Vorrichtung in einem FDY-Schmelzspinnprozess

Fig. 3 bis Fig. 6

schematisch Ansichten weiterer Ausführungsbeispiele der erfindungsgemäßen Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens

They show:

Fig. 1

schematically a view of a first embodiment of the device according to the invention in a POY melt spinning process

Fig. 2

schematically a view of another embodiment of the device according to the invention in a FDY melt spinning process

Fig. 3 to Fig. 6

schematic views of further embodiments of the device according to the invention for carrying out the method according to the invention

In the FIG. 1 a first embodiment of the device according to the invention in a melt spinning process for producing a POY yarn is shown schematically.

For melt-spinning a multifilament yarn, a heatable spinning head 1 is provided which has on its underside a spinneret 3 with a multiplicity of nozzle openings and on its upper side a melt feed 2. The melt inlet 2 is coupled to a melt source, not shown here, for example, to an extruder. Within the spinning head 1 further melt-leading and melt-promoting components can be arranged, which will not be discussed in detail at this point.

Below the spinneret 3, a cooling shaft 5 is formed, which is laterally connected to a blowing device 6. About the blowing 6, a cooling air flow can be generated, which is introduced into the cooling shaft 5, so that an extruded through the spinneret 3 filament bundle 4 is cooled uniformly.

Below the cooling shaft 5, a collecting yarn guide 7 and a preparation device 8 are provided to merge the filament bundle 4 into a yarn 9.

In order to remove the thread 9 or the filament bundle 4 from the melt spinning zone and to stretch, the device according to the invention is arranged below the preparation device 8. The device has a first driven godet 10.1 and a second driven godet 10.2, which are arranged at a short distance from each other. Laterally next to the godets 10.1 and 10.2, a guide roller 11 is arranged. The deflection roller 11 is preferably located in a median plane to the godets 10.1 and 10.2. The guide roller 11 is rotatably mounted and held at the same distance from the godets 10.1 and 10.2.

To remove and stretch the thread 9, the godets 10.1 and 10.2 and the guide roller 11 are arranged in the yarn path, that the yarn 9 is fed over the circumference of the godet 10.1 and continued over the circumference of the godet 10.2. The stretched between the godets 10.1 and 10.2 thread piece is guided as a thread loop 12 between the godets 10.1 and 10.2, wherein the end of the thread loop 12 is determined by the position of the guide roller 11 and wherein the thread 9 is deflected at the periphery of the guide roller 11. The thread piece between the godets 10.1 and 10.2 is thereby swirled in the outgoing section of the thread loop 12 between the guide roller 11 and the godets 10.2 by a swirling device 22. For this purpose, the thread 9 is guided with a speed difference between the godets 10.1 and 10.2. For this purpose, the peripheral speed of the godet 10.2 is set equal to or slightly lower than the peripheral speed of the godet 10.1. In that regard, a draw of the thread takes place substantially in the upstream melt spinning zone.

After the expiry of the galette 10.2 the thread 9 is guided via a guide roller 13 to a winding device 14. In the winding device 14, the thread 9 is wound into a bobbin 18, wherein the laying of the thread by a traversing device 15, a pressure roller 16 takes place on the spool 18. The coil 18 is held by a driven winding spindle 17.

This in Fig. 1 illustrated embodiment shows a first application for the use of the method and apparatus of the invention. By the laterally guided next to the godets 10.1 and 10.2 thread loop can be formed on the thread treatment lines, which are advantageously aligned transversely aligned to the yarn path, so that a very compact godet below the cooling shaft 5 leads to a very short and compact overall device. Here, for example, could be assigned to the tapered portion of the thread loop, a further treatment device for the relaxation of the thread 9, for example, to heat the thread piece between the godet 10.1 and the guide roller 11. In addition to a relaxation, the Verwirbelungsergebnisse to produce a thread closure can be improved.

In Fig. 2 is a further embodiment of the device according to the invention for carrying out the method according to the invention in a melt-spinning process for producing a fully drawn yarn (FDY) shown schematically. In the Fig. 2 shown overall device differs essentially only by the formation of the method and apparatus of the invention. The means for melt-spinning the multifilament yarn and the means for winding the multifilament yarn are identical to the aforementioned embodiment Fig. 1 so that reference is made to the above description at this point.

For stripping and stretching of the multifilament yarn, the device according to the invention is formed with a plurality of godet pairs 32.1 and 32.2. The first godet pair 32.1 is formed by the godets 10.1 and 10.2, which are arranged downstream of the preparation device 8. Between the godets 10.1 and 10.2, a first guide roller 11.1 is arranged, each with the same distance to the godet 10.1 and 10.2. In the distance between the guide roller 11.1 and the godets 10.1 and 10.2, a heater 20 is arranged, which has two opposing infrared radiators 21.1 and 21.2. Between the infrared radiators 21.1 and 21.2, the thread loop 12 is guided. For this purpose, the thread 9 is fed over the circumference of the godet 10.1. The stretched between the godets 10.1 and 10.2 piece of thread is deflected by the guide roller 11.1 at the end of the thread loop 12, wherein the tapered portion of the thread loop 12 is heated by the infrared radiator 21.1 and the expiring thread section of the thread loop 12 through the infrared radiator 21.2. Subsequently, the thread 9 is guided over the circumference of the godet 10.2 in a draw zone formed between the godet pairs 32.1 and 32.2.

The godet pair 32.2 is formed by the godets 10.3 and 10.4, which is associated with a spaced-apart guide roller 11.2. The deflection roller 11.2 is arranged at substantially the same distance from the godets 10.3 and 10.4 in a central region. The stretched between the godets 10.3 and 10.4 Thread piece is thus also performed as a loop of thread 12 over the circumference of the guide roller 11.2. In the running section of the thread loop 12 between the guide roller 11.2 and the godet 10.4 a swirling device 22 is provided.

The take-up device 14 is arranged downstream of the godet pair 32.2, so that the thread 9 running from the last godet 10.4 is wound into a coil 18.

At the in Fig. 2 illustrated melt spinning process, the thread 9 is withdrawn and stretched over the two pairs of godets 32.1 and 32.2. For this purpose, the godets 10.1 and 10.2 of the first godet pair 32.1 are driven substantially at the same peripheral speed, wherein the thread 9 between the godets 10.1 and 10.2 is tempered within the thread loop 12. For this purpose, a separate infrared radiator 21.1 and 21.2 is assigned to each section of the thread loop. Between the godet pairs 32.1 and 32.2, a speed difference is set such that the godet 10.3 rotates at a greater circumferential speed than the godet 10.2. The thread 9 is thus stretched between the godet pairs 32.1 and 32.2. Before winding the thread 9 this holds a swirl that is performed immediately before the expiration of the last godets 10.4. The godets 10.3 and 10.4 are operated with a slight difference in speed.

This in Fig. 2 illustrated embodiment shows an application of the device according to the invention and the inventive method in the production of fully drawn threads. Particularly advantageous over the known in the prior art device results in the thread guide with simple looping on the godets 10.1 to 10.4. In that regard, long overhanging guide shells to accommodate multiple wraps of the thread are no longer required. In addition, the tempering can be realized advantageously in the area of the thread loops between the godets 10.1 and 10.2.

In Fig. 3 is a further embodiment of a device according to the invention shown schematically. The device differs essentially by the in Fig. 1 embodiment shown by a parallel guide a plurality of threads on the circumference of the godets.

For this purpose, the godet 10.1 has a guide casing 19.1, which is rotatably mounted on a godet carrier 24.1 and is driven in the direction of the arrow by a drive, not shown here. The adjacent at a short distance second godet 10.2 also has a guide sheath 19.2, which is rotatably supported on the godet 24.2 and is driven by a drive, not shown here in the same direction to the first godet. In the middle region between the godets 10.1 and 10.2, a deflection roller 11 is arranged at a distance from the guide sheaths 19.1 and 19.2. The guide roller 11 is rotatably mounted on an axis 23, wherein the axis 23 is fixed to a carrier 33. Between the guide roller 11 and the downstream in the yarn run godet 10.2 a treatment device 25 is provided, which could be formed for example as a heater or as a swirling device.

In the Fig. 3 Device shown is provided to guide a plurality of parallel threads 9. For this purpose, two parallel threads 9 are guided in this embodiment, each with a Teilumschlingung to the guide shrouds 19.1 and 19.2. The thread loops 12 formed between the guide sheaths 19.1 and 19.2 and the guide roller 11 also extend parallel to each other side by side, wherein preferably a thread pitch a is set between the thread loops in the range of 3 to 8 mm. Thus, even with a large number of threads compact and short godets and overflow rollers can be used. The threads 9 run parallel to the treatment device 25 in order to be simultaneously tempered or swirled. It should be expressly mentioned at this point that the embodiments shown above and the embodiments shown below are not based on the guidance of a thread are limited, but also at the same time could deduct and stretch several parallel threads.

In Fig. 4 is shown a further embodiment of a device according to the invention, as for example in an in Fig. 2 illustrated melt spinning process would be used.

The embodiment according to Fig. 4 has a total of two pairs of godets 32.1 and 32.2. The godets 10.1 and 10.2 is the guide roller 11.1 and the godets 10.3 and 10.4 of the second godet pair 32.2 associated with the guide roller 11.2. At each godet pair 32.1 and 32.2, the thread 9 is guided between the godets as a loop of thread 12. In this case, both the thread loop 12 of the first godet pair 32.1 and the thread loop of the second godet pair 32.2 are tempered by a respective heating device 20.1 and 20.2. The heaters 20.1 and 20.2 are identically constructed and have a plurality of infrared heaters 21.1 and 21.2. In the event that several threads are guided parallel to the circumference of the godets 10.1 to 10.4, further infrared emitters not shown here could be integrated within the heater 20.1 and 20.2.

The godets 10.1 and 10.2 of the first godet pair 32.1 are driven by separate godet drives 26.1 and 26.2. The godet drives 26.1 and 26.2 are associated with a controller 27, so that the godets 10.1 and 10.2 are preferably operated at the same peripheral speeds. In contrast, the godets 10.3 and 10.4 of the second godet pair 32.2 are driven by separate godet drives 26.3 and 26.4 and separate control devices 28.1 and 28.2. This allows the godets 10.3 and 10.4 preferably operate at different peripheral speeds.

In order to be able to generate high stretching forces between the pairs of godets and for pulling off the thread, the thread 9 on the godets with a wrap angle in the range> 120 °, preferably> 160 ° out. The wrap angle is shown with reference number a example in the godet 10.1. The thread loop on the circumference of the deflection roller 11.1 and 11.2 is preferably produced with a wrap angle in the range of 180 °.

This in Fig. 4 illustrated embodiment is so far particularly suitable to perform a high draw on a synthetic thread. Thus, more pairs of godets can be added with or without a heating device, so that, in addition to stretching, shrinking treatment, for example during the production of technical rubber, is also possible at the same time. To be at the in Fig. 4 illustrated embodiment of the last godet pair 33.2 to perform a shrinkage treatment, the godet 10.3 and 10.4 are preferably driven with a speed difference such that the piece of thread between the godets 10.3 and 10.4 within the thread loop 12 can perform a relaxation.

In Fig. 5 a further embodiment of the device according to the invention is shown, as for example in the in Fig. 1 or Fig. 2 melt-spinning processes could be used. The embodiment is substantially identical to the in Fig. 1 and 3 illustrated embodiments, so that only the differences will be explained at this point.

At the in Fig. 5 illustrated embodiment, the guide roller 11.1 is guided between the godets 10.1 and 10.2 on a guide rail 31 movable. On the guide rail 31, the guide roller 11 can be moved back and forth between an application position and an operating position. In Fig. 5 the application position is shown in dashed lines. The guide rail 31 terminates in the operating position within a heating chamber 29. The guide roller 11 is held in the operating position within the heating chamber 29, so that the thread loop 12 formed between the godets 10.1 and 10.2 is held substantially within the heating chamber 29. Within the heating chamber 29 are the sections associated with the thread loop heating elements 30, preferably run without contact or by contact heating of the thread 9.

The movably held deflection roller 11 in the exemplary embodiment Fig. 5 allows easy threading of the thread 9 at the beginning of the process. Thus, the thread 9 with simple wrap around the two godets 10.1 and 10.2 lead. The situation is shown in dashed lines. Now, the guide roller 11 is guided from the contact position to the operating position, wherein the thread 9 between the godets 10.1 and 10.2 is detected and is guided to the opposite side of the godet in a loop of thread 12. As soon as the deflection roller 11 reaches the operating position within the heating chamber 29, the application process is completed.

This in Fig. 5 illustrated embodiment can optionally be combined with the previously shown embodiments of the device according to the invention, so that even when using multiple pairs of godets, the application of the thread in a simple manner is executable.

In Fig. 6 a further embodiment of the device according to the invention is shown, as for example in the in Fig. 1 or Fig. 2 melt-spinning processes could be used. The embodiment is essentially identical to the variants described above, so that only the differences are explained to avoid repetition at this point.

At the in Fig. 6 illustrated embodiment, the guide roller 11 is disposed in the central region above the godets 10.1 and 10.2. The guide roller 11 and the godets 10.1 and 10.2 each have an identical in size guide sheath, so that the thread 9 is guided on the overflow roller 11 and the godets 10.1 and 10.2 at an identical sheath diameter.

In the area below the overflow roller 11 and above the godets 10.1 and 10.2, an infrared radiator 21 is arranged as a treatment device. The infrared radiator 21 is designed such that on both longitudinal sides in each case a radiation is generated, which is directed directly to a piece of thread of the thread loop 12. Each longitudinal side of the infrared radiator 21 is associated with a radiation converter 34.1 and 34.2. Here, the radiation converter 34.1 forms above the godet 10.1 together with the infrared radiator 21 a free space through which the running of the galette 10.1 to overflow roller 11 thread piece of the thread loop 12 is guided. On the opposite side of the running thread piece of the thread loop 12 is guided by the overrun roller 11 to the second galette 10.2 through a second space which extends between the infrared radiator 21 and the second radiation converter 34.2.

For guiding and drawing the thread 9, the godet 10.1 is driven by the godet drive 26.1 and the godet 10.2 by the godet drive 26.2. Here, the godet drives 26.1 and 26.2 are independently controlled via the control units 28.1 and 28.2.

At the in Fig. 6 illustrated embodiment, the guide roller 11 is rotatably mounted, so that acts on the thread 9 a generated by the speed difference between the godets 10.1 and 10.2 thread tension. The peripheral speed of the godet 10.2 can be advantageously set such that a desired winding tension of the thread prevails.

To heat the thread within the thread loop 12, the effect of the infrared radiator 21 is significantly increased by the associated radiation converter 34.1 and 34.2. For example, it is known that, in particular, radiations in the medium wavelength range are particularly effective for heating polymer materials. Polymer materials absorb the infrared radiation predominantly in the wavelength range of 3 to 5 μm. Very short-wave and very long-wave infrared radiation, which are also generated by an infrared radiator, cause no significant heating of the thread due to the lack of absorption effect of the thread material. The unused radiation is then converted by the radiation converter 34.1 and 34.2 to a medium-wave radiation and reflected. Thus, the electric power of the radiator can be exploited with higher efficiency for heating the thread. In addition, a uniform heating of the thread is achieved by two-sided irradiation. In that regard, that is in Fig. 6 illustrated embodiment particularly suitable to produce defined stretching points during the drawing of the thread. Alternatively, however, there is also the possibility that in the in Fig. 6 illustrated embodiment, only the piece of thread between the galette 10.1 and the overflow roller 11 is heated.

The inventive method and the device according to the invention are not on the in Fig. 1 and 2 limited melt spinning processes. On the contrary, the method and apparatus of the invention can be incorporated in any melt spinning process to make a multifilament yarn to draw and stretch one or more filaments after melt spinning. Advantageously, different treatment stages and treatments can be carried out with it so that threads for technical applications can be produced in addition to textile applications. It can thus also produce composite threads or crimped threads such as carpet yarns.

LIST OF REFERENCE NUMBERS

1

spinning head

2

melt inlet

3

spinneret

4

filament bundles

5

coolant hose

6

blowing device

7

Collecting yarn guides

8th

dissector

9

thread

10.1, 10.2, 10.3, 10.4

Galette

11, 11.1, 11.2

idler pulley

12

thread loop

13

leadership

14

rewinder

15

Traversing unit

16

pressure roller

17

winding spindle

18

Kitchen sink

19.1, 19.2

guide sheath

20

heater

21, 21.1, 21.2

infrared Heaters

22

The interlacing

23

axis

24.1, 24.2

Galettenträger

25

treatment facility

26.1, 26.2, 26.3, 26.4

godet

27

control unit

28.1, 28.2

control unit

29

heating chamber

30

heating elements

31

guide rail

32.1, 32.2

galettes

33

carrier

34.1, 34.2

radiation converter

Claims (21)

1. A method for pulling off and drawing a multifilament thread during melt spinning, in which the thread is guided with partial looping by guide casings of two driven godets, and in which the thread is tensioned by means of a thread piece between the godets, characterized in that the thread piece is guided as a thread loop between the godets, the thread being guided at the loop end via a rotatably mounted deflecting roller.
2. The method as claimed in claim 1, characterized in that the thread is guided with a looping angle of >120° on the circumference of at least one of the guide casings of the godets.
3. The method as claimed in claim 1 or 2, characterized in that the thread piece is treated between the godets by means of thermal action and/or swirling.
4. The method as claimed in claim 3, characterized in that the thread piece is treated identically or differently in the incoming portion of the thread loop and in the outgoing portion of the thread loop.
5. The method as claimed in claim 3 or 4, characterized in that thermal action upon the thread piece is carried out contactlessly by means of an infrared radiator.
6. The method as claimed in one of the abovementioned claims, characterized in that the godets are driven independently of one another and are controlled independently of one another in terms of the circumferential speeds of their guide casings.
7. The method as claimed in one of claims 1 to 6, characterized in that the godets are driven jointly and are controlled jointly in their circumferential speeds.
8. The method as claimed in one of claims 1 to 7, characterized in that the thread is guided via a plurality of pairs of godets for drawing, the thread piece tensioned between the godets being guided as a thread loop at each of the pairs of godets.
9. The method as claimed in one of claims 1 to 8, characterized in that a plurality of threads are guided simultaneously in parallel next to one another on the godets, the thread loops formed between the guide casings being guided on the circumference of the deflecting roller with a spacing in the range of 3 mm to 8 mm.
10. An apparatus for carrying out the method as claimed in one of claims 1 to 9, with two godets (10.1, 10.2) arranged following a device for melt spinning a multifilament threat (9) and at a distance from one another and having rotatably driven guide casings (19.2, 19.2), the godets being designed and arranged such that a yarn path for at least one thread (9) is established with only a partial looping on the guide casings (19.1, 19.2), and the thread (9) being tensioned by means of a thread piece between the godets (10.1, 10.2), characterized in that a rotatably mounted deflecting roller (11) is arranged in the thread run between the godets (10.1, 10.2) and is held with a spacing with respect to the guide casings (19.1, 19.2) of the godets (10.1, 10.2) in such a way that the thread piece is guided as a thread loop (12) between the godets (10.1, 10.2).
11. The apparatus as claimed in claim 10, characterized in that the godets (10.1, 10.2) are arranged in the thread run in such a way that the thread forms a looping angle of > 120° on the circumference of at least one of the guide casings (19.1, 19.2).
12. The apparatus as claimed in claim 10 or 11, characterized in that a treatment device (25) is arranged in the thread run between the deflecting roller (11) and at least one of the godets (10.1, 10.2).
13. The apparatus as claimed in claim 12, characterized in that the treatment device (25) has a swirling device (22) for swirling the thread piece.
14. The apparatus as claimed in claim 12 or 13, characterized in that the treatment device (25) has a heating device (20) for thermal action upon the thread piece.
15. The apparatus as claimed in claim 14, characterized in that the heating device (20) has at least one tubular infrared radiator (21).
16. The apparatus as claimed in claim 15, characterized in that the infrared radiator (21) co-operates with a radiation converter (34.1), the thread being guided, for heating, in a free space formed between the infrared radiator (21) and the radiation converter (34.1).
17. The apparatus as claimed in claim 14 or 15, characterized in that the run-over roller (11) and the godets (10.1, 10.2) have an identical casing diameter for guiding the thread, and in that the radiant heater (21) is arranged within the thread loop.
18. The apparatus as claimed in one of claims 10 to 17, characterized in that the godets (10.1, 10.2) have in each case a controllable godet drive (26.1, 26.2), by means of which the guide casings (19.1, 19.2) can be driven at a predetermined circumferential speed.
19. The apparatus as claimed in claim 18, characterized in that the godet drives (26.1, 26.2) of the godets are assigned one control unit (27) or two separate control units (28.1, 28.2).
20. The apparatus as claimed in one of claims 10 to 19, characterized in that a plurality of pairs of godets (32.1, 32.2) are arranged in the thread run, and in that each of the pairs of godets (32.1, 32.2) is assigned a separate deflecting roller (11.1, 11.2) for guiding the thread loop (12).
21. The apparatus as claimed in one of claims 10 to 20, characterized in that the guide casings (19.1, 19.2) of the godets (10.1, 10.2) are designed with a length such that a plurality of threads (9) can be guided next to one another in parallel simultaneously.

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