WO2015049312A1

WO2015049312A1 - Method and apparatus for producing synthetic fully drawn yarns

Info

Publication number: WO2015049312A1
Application number: PCT/EP2014/071084
Authority: WO
Inventors: Hansjörg MEISE; Philip JUNGBECKER; Roy DOLMANS; Matthias EVERTZ; Denis Bauer
Original assignee: Oerlikon Textile Gmbh & Co. Kg
Priority date: 2013-10-02
Filing date: 2014-10-01
Publication date: 2015-04-09
Also published as: CN105593416B; DE112014004597A5; CN105593416A; JP6588012B2; JP2016532013A

Abstract

The invention relates to a method and an apparatus for producing synthetic fully drawn yarns (FDY) by drawing and relaxing a number of freshly spun yarns. The yarns spun and solidified by a spinning device and a cooling device are guided together as a yarn group around the circumference of a number of driven godet casings. The yarns come into contact with the godet casings with a partial looping of < 360°, wherein the yarns are thermally treated on the surfaces of the godet casings and are freely guided between the godet casings with at least one difference in speed. In order to be able to produce yarns having high-quality dyeability, according to the invention the yarns are guided and drawn between a first heated godet casing and a second heated godet casing in a free tension section, wherein, before drawing, the yarns are provided with a thermal pretreatment at a surface temperature of the first godet casing of 40°C to 80°C or wherein, before drawing, the yarns are guided at ambient temperature. As a result of such low-temperature drawing, high stability in the formation of the drawing point in the filament strands of the yarns is brought about.

Description

Process and apparatus for producing synthetic fully stretched

threads

The invention relates to a method for producing synthetic fully drawn threads by drawing and relaxing freshly spun threads according to the preamble of claim 1 and to an apparatus for producing fully stretched synthetic threads by drawing and relaxing freshly spun threads according to the preamble of claim 8.

In the production of synthetic threads in a melt spinning process, the freshly spun threads, after cooling for further treatment, are preferably guided as a group of threads on an arrangement of several godets with driven godet sheaths. The galette coats of the godets can be made heated or unheated to pull the threads after spinning, stretch and relax. Particularly in the production of fully drawn threads (FDY), methods and devices for drawing off and stretching the spun threads are known in the prior art, in which the group of threads is guided on the surfaces of the godet sheaths, in each case with a partial looping. In this way, it is advantageously possible to avoid long-protruding, multi-wound godet sheaths, so that less energy is needed to heat the godet sheaths.

Such a method and such a device are known for example from WO 2013/020866 AI. The known method and the Known device based on the fact that the threads are unwrapped, stretched and relaxed after spinning unwetted or with low wetting. In that regard, the threads are performed together as a group of threads on the circumference of the driven Galettenmänteln with a Teilumschlingung of <360 °. The godet coats are designed for stretching and relaxation heatable, the cantilevered length of the godet coats is determined essentially by the number of threads and the thread spacing. In that regard, very compact galette coats can be realized with relatively small circumference sflächen.

For the quality of the fully drawn yarns produced, the so-called dyeability of the fibers is used as a benchmark in a subsequent process. For example, during further processing into textile fabrics, it is necessary that no irregularities occur during coloring. However, the dyeability of the filaments requires that each of the filaments contained in the filaments show an equal receptivity to the colored pigments. Therefore, in the production of fully drawn yarns uniform stretching of all filaments within a yarn sheet is of great importance. Even small differences in the initiation of a draw point within the group of threads have a disadvantageous effect on uniform staining of the threads. However, such irregularities in the drawing of the threads are dependent on the thread denier, the production of fine threads is particularly sensitive. It is therefore an object of the invention to improve the generic method and the generic device such that, regardless of the thread denier in the production of a yarn sheet at each of the to set as identical as possible physical properties that allow a high quality staining.

A further object of the invention is to provide a generic method as well as a generic device with which a stable thread guide and thread treatment is possible both for dry threads and for wetted threads.

This object is achieved by the method with the features of claim 1 and by an apparatus having the features of claim 8.

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

The invention is based on the finding that the formation of a draw point when stretching a thermoplastic fiber is highly temperature-dependent. The higher the stretching temperature is chosen, the greater the expansion of the drawing point within the fiber. However, such relatively large flowing transitions can be difficult to control within a group of threads. Due to the thread guide with simple Teilumschlingung on the surfaces of the godet coats, however, a Kaltver stretch is hardly feasible due to the required high stretching forces. In that regard, the invention uses a low temperature region for stretching the filaments, which has a significant effect on the stabilization of the draw point. For this purpose, the threads are guided and stretched between a first heated godet jacket and a second heated godet jacket in a free tension section, the threads projecting the stretching obtained a thermal pretreatment with a surface temperature of the first godet shell from 40 ° to 80 °. Depending on the type of polymer, however, even lower temperatures can be achieved, so that the filaments are guided at room temperature before being drawn.

The device according to the invention thus offers the particular advantage that a complete drawing of the threads can already be carried out between a first godet jacket and a second godet jacket, wherein the first godet jacket can be heated by a separate heating means at a surface temperature of 40 to 80 ° or, alternatively, can not be heated is executed. Such low-temperature stretching also allows the production of very fine Filamenttitern that can get a high quality staining in further processing.

Since very strong air currents are generated in the vicinity of the godet coats during stretching due to the relatively high peripheral speeds of the godets, it is provided for stabilizing the thread run that the threads are guided for drawing in the free tension with a free thread length in the range of 150 mm to 350 mm become. It has been shown that with a clamped thread length in the range below 350 mm, the threads do not receive any significant vibration excitation due to air currents. Only at longer voltage ranges cause the Schleufplufteinflüsse the godet surfaces, a swing of the yarn sheet, which has a negative effect on the stabilization of the draw point. To set such free thread lengths in the voltage range of the stretching distance between the first godet casing and the second godet casing is limited to a size in the range of 40 mm to 200 mm in the inventive device.

In order to eliminate in particular the internal stresses in the molecular chains of the filament strands occurring during the low-temperature stretching, it is further provided that the threads between the second godet casing and a third godet casing in a first free Relaxierstrecke and between the third godet casing and a fourth godet casing in a second free Relaxierstrecke be guided and relaxed, the threads within the Relaxierstrecken each having a free thread length in the range of 100 mm to 200 mm. Thus, even at high peripheral speeds of the godet surfaces from 4,000 to 5,000 m / min. use relatively long residence times for thermal treatment and for reducing internal stresses of other threads. The relatively short free thread lengths in the Relaxierstrecken also favor a uniformity of the temperature of the threads.

In order to perform such aftertreatment of the yarn sheet, a first Relaxierab were between the second godet casing and a third godet casing and between the third godet casing and the fourth godet shell a second Relaxierab was formed, the Relaxierab stood between adjacent godet coats a maximum size of 150 mm. This also achieves a very compact godet arrangement for the thermal aftertreatment of the fully drawn threads. The Relaxierab stood between the godet coats can be the same size or unequal size. In the method according to the invention, the thermal treatment for relaxing the threads is preferably carried out in several stages, wherein the godet shells are each heated with a surface temperature in the range of 100 ° C to 250 ° C. In order to obtain the most rapid and lasting tempering of the filament strands within the threads after stretching the threads, the method variant in which the threads in the first free Relaxierstrecke between the second godet shell and the third godet shell with a thread tension generated by a differential speed be guided. The thread tension of the first free Relaxierstrecke is chosen such that the threads are performed with their filament strands as possible in a band-shaped contact with the surfaces of the godet coats. Such thread tensions can be already at low speed differences of 50 to 400 m / min. produce.

The degradation of the internal stresses within the filament strands of the threads is favored by the process variant, in which the threads are guided in the second Relaxierstrecke between the third godet shell and the fourth godet shell substantially low stress. Thus, the third godet casing and the fourth godet casing are preferably operated without speed difference. It has been shown that the internal stress relief in the threads can be further improved by guiding the threads after relaxation with a transfer of the fourth godet jacket to a follower godet and / or to a winding machine. Thus, the production of low-shrink full-stretched threads is possible.

The thermal treatment in relaxing the filaments is determined essentially by contact between the filaments and the surfaces of the godet coats. In this case, the device according to the invention is preferably designed such that the godet shells of the godets are made the same size in diameter for heat treatment of the threads.

In order to obtain no mutual influence of the thermal treatments, especially in the low-temperature stretching, the development of the device according to the invention is particularly advantageous, in which a heat insulation is formed with a yarn passage opening between the first godet shrouds and the second godet shrouds. Thus, the low-temperature heated godet surface remains unaffected by the high-temperature treatment of the threads during relaxation.

For this purpose, the second godet coats, the third godet coats and the fourth godet coats are arranged together in a galette box with the thermal insulation, so that a stable environment for the relaxation of the threads sets.

To stabilize the thermal treatment before stretching, the development of the device according to the invention is provided in which the first godet casing is encapsulated in a second godet box.

In order to be able to make the speed settings for the godet sheaths required for stretching and for relaxing, separate controllable godet drives are assigned to the first godet casing and the second godet casing. In contrast, a common godet drive is assigned to the third godet casing and the fourth godet casing.

In order to use in particular the relatively short contact surface between the threads and the first godet shell for heating the threads, the development of the invention is preferably carried out, in which on an inlet side of the first galette two guide rollers are provided, each with a driven-guide shell, the are arranged upstream of the first godet shell. Thus, already a yarn tension can be generated within the yarn sheet, which favor an intensive contact with the first heated godet casing. In this case, the desired thread tensions can be generated by differences in diameter between the guide rollers and the godet casing.

The method according to the invention will be explained in more detail below with reference to some embodiments of the device according to the invention with reference to the accompanying figures.

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

2 is a schematic plan view of the godet assembly of the embodiment of FIG. 1

Fig. 3.1

and

Fig. 3.2 shows schematically the godet assembly of the embodiment

Fig. 1

Fig. 4 shows schematically a view of another godet assembly of

Embodiment of FIG. 1

In FIGS. 1 and 2, a first embodiment of the device according to the invention for producing synthetic fully drawn threads by stretching and relaxing a plurality of freshly spun threads is shown schematically in several views. Fig. 1 shows schematically a front view of the complete device and Fig. 2 shows schematically a plan view of the provided for stretching and relaxing godet assembly. Unless an explicit reference is made to one of the figures, the following description applies to both figures.

1 shows schematically an embodiment of the device according to the invention for producing synthetic fully drawn threads. The exemplary embodiment has a spinning device 1 which has a heated spinning beam 1.1 and a plurality of spinning nozzles 1.2 held in a row arrangement on the spinning beam 1.1. The spinnerets 1.2 are arranged orthogonal to the plane of the drawing one behind the other, so that in the illustration in Fig. 1, only one of the spinnerets 1.2 is shown. The spinnerets 1.2 at the bottom of the spinner 1.1 are provided with a Melt feed 1.3 coupled, wherein within the spinning beam 1.1 a melt distribution system is arranged consisting of spinning pumps and distribution lines. Below the spinning device 1, a cooling device 2 is provided which vertically below the spinnerets 1.2 each forms a cooling shaft 2.1, which are arranged within a blowing chamber 2.2. The cooling shaft 2.1 is formed in this embodiment by a cooling cylinder with air-permeable wall, so that an emerging from the blowing chamber 2.2 cooling air strikes radially from outside to inside the freshly spun filament strands. The blow chamber 2.2 is coupled via an air connection 2.3 with a cooling air source not shown here.

Below the cooling device 2, a plurality of collecting guides 3 are provided in order to combine the filaments spun from the spinning nozzles 1.2 into a thread in each case.

Below the Sammelf Adenführer 3 a yarn inlet device 21 is provided, in which the threads are brought together at a treatment distance. The thread inlet device 21 forms the collection point, in which the threads are fed in the event of a yarn breakage of a suction device. The thread inlet device 21 forms an interface between the spinning device and a downstream godet arrangement of several godets for pulling, stretching and relaxing the freshly spun threads.

1, the yarn inlet device 21 is followed by a plurality of godets 4.1 to 4.4, which are connected to a yarn feeder. run side by side. For further explanation of the godet arrangement is in addition to that of FIG. 2 reference.

As is apparent from FIGS. 1 and 2, the godets 4.1 to 4.4 each have a projecting godet casing 5.1 to 5.4, which are held on a front side of a mounting wall 10. The godet jackets 5.1 to 5.4 are coupled via a drive shaft not shown here, each with a godet motor 6.1 to 6.4. Thus, the first godet casing 5.1 is driven by the godet motor 6.1, wherein the godet motor 6.1 is associated with a drive control 7.1. Accordingly, the second godet casing 5.2 is driven by a second godet motor 6.2, which is also associated with a separate drive control 7.2. The third godet casing 5.3 is coupled to the third godet motor 6.3 and the fourth godet casing 5.4 to the fourth godet motor 6.4, wherein the two godet motors 6.3 and 6.4 are connected to a common drive control 7.3. As can be seen in particular from the representation in FIG. 2, the godets 4.1 to 4.4 each have separate heating means 8.1 to 8.4 which are assigned to the godet sheaths 5.1 to 5.4 and which can be controlled by separate heating controls 9.1 to 9.3. The godet motors 6.1 to 6.4 are formed alternately by a left-handed and a right-handed motor, so that adjacent godet sheaths 5.1 and 5.2 are driven in opposite directions of rotation. This makes it possible to use the threads together as a thread sharp 19 on the circumference of the godet casing 5.1 to 5.4, each with a partial wrap to lead. Depending on the arrangement of the godet casing 5.1 to 5.4 partial Umschlingungen of <360 ° are preferably achieved in the range of 180 ° to 270 ° for guiding the threads on the circumference of the godet casing 5.1 to 5.4.

As is apparent from the illustration in FIG. 1 and FIG. 2, the godet shells 5.2, 5.3 and 5.4 of the godets 4.2 to 4.4 are arranged within a godet box 11 and kept insulated from the environment. The godet box 11 has between the first godet casing 5.1 and the second godet casing 5.2 an inlet opening 12, through which the yarn sheet 19 is guided. On the opposite side of the godet box 11, an outlet opening 13 is provided through which the yarn sheet 19 leaves the godet box 11.

As can be seen from the illustration in Fig. 1, the yarn sheet 19 is stretched after the United and relaxing over two guide rollers 14.1 and 14.2 out, each having a driven guide sheath 15.1 and 15.2. The guide roller 14.1 is preceded by a preparation device 22, by means of which the bundle of threads is wetted after stretching. In the further course, a swirling device 23 is provided between the guide rollers 14.1 and 14.2, which has a treatment channel (not shown here) for each thread, in order to swirl the filaments of the threads separately to equalize the preparation application and to form a thread closure.

At the end of the process, the filaments are fed to a winder to wind each of the filaments into a bobbin. The On winder, which is not shown in this embodiment, may include one or more groups of winding stations to wind the plurality of threads simultaneously to coils. In the exemplary embodiment illustrated in FIGS. 1 and 2, a plurality of multifilament threads is produced parallel to one another from the polymer melt, which is preferably fed to the melt feed 1.3 via an extruder, by means of the spinnerets 1.2. In Fig. 1, the filaments 20 of one of the threads are shown, which are merged by the spinneret 1.2 associated Sammelfden adenführer 3 to form a thread. For spinning the threads, for example, ten, twelve or even more spinnerets can be arranged on the underside of the spinning bar 1 in order to produce the threads of a group of threads. However, it is also possible to use so-called double-spinnerets, in which two threads are simultaneously extruded from one of the spinnerets.

After the filaments have been cooled and brought together in each case to form one thread, the group of threads 19 is guided through the thread inlet device 21 to a thread spacing which is short for the further treatment. The threads of the yarn sheet 19 are parallel next to each other first received by the first godet shell 5.1 of the first godet 4.1. The first godet casing 5.1 is heated by the associated heating means 8.1 to a surface temperature in the range of 40 ° C to max. Heated to 80 ° C. In that regard, a warming of the group of threads occurs, which remains just below the glass transition temperature. The first godet casing is at a peripheral speed in the range of above 1,500 m / min. driven. Between the first godet casing 5.1 and the second godet casing 5.2, a stretching length for free yarn guidance is formed. det. Within the stretch length, the yarn sheet 19 is completely stretched, wherein the second godet casing 5.2 with a peripheral speed in the range above 3,500 m / min. preferably above 4,000 m / min. is operated. The second godet casing 5.2 has on its surface a much higher surface temperature in comparison to the first godet casing 5.1. Thus, the godet casing 5.2 is heated at a temperature in the range above 100 ° C, preferably above 120 ° C to 200 ° C. Thus, immediately after the drawing in the yarn sheet 19, a thermal aftertreatment begins to eliminate the internal stresses in the molecular structure of the filaments. To relax the threads, the group of threads is thermally treated in several stages. Thus, the third godet casing 5.3 and the fourth godet casing 5.4 are also heated to a surface temperature in the range of 100 ° C to 250 ° C. Between the second godet casing 5.2 and the third godet casing 5.3 a first Relaxierstrecke is formed for free yarn guide. A second relaxation path is provided between the third godet casing 5.3 and the fourth godet casing 5.4.

To illustrate and explain the free thread lengths within the voltage range and the Relaxierstrecken reference is made to the figures in Fig. 3.1 and 3.2. In Figures 3.1 and 3.2, the godets 4.1 to 4.4 are shown schematically in their arrangement to each other. In this case, the yarn path of the yarn sheet 19 is shown in FIG. 3.1, wherein the voltage path between the first godet casing 5.1 and the second godet casing 5.2 is indicated by the capital letter S. The first relaxation path is identified by the capital letter Ri and formed between the second godet casing and the third godet casing 5.3. The second Relaxierstrecke is with the Identification letter R _{2 is} marked and extends between the godet sheaths 5.3 and 5.4. The voltage path, as well as the Relaxierstrecken thereby designate the free thread length, which adjusts before a flow point on the circumference of the godet shell to a casserole point of the threads of the adjacent godet shell.

In contrast, in FIG. 3.2, the pure distance between the godet sheaths is shown. Thus, the distance between the godet sheaths 5.1 and 5.2 is referred to as stretching distance and marked by the capital letter Gs. A first relaxation distance between the second godet casing 5.2 and the third godet casing 5.3 is identified by the code letter G _R1 . The adjusting between the godet sheaths 5.3 and 5.4 second Relaxierabstand is referred to as G _R2 .

In order to obtain a thread guide which is as stable as possible, in particular during stretching of the threads, the stretch length S is limited in a range of 100 mm to 350 mm. The stretching distance between the first godet casing 5.1 and the second godet casing 5.2 thus has a size in the range of 40 mm to 200 mm.

The relaxation distances Ri and R ₂ are the same size in this embodiment. In principle, however, it is also possible to form the relaxation paths Ri and R ₂ in different sizes. In this embodiment, the relaxation distances Ri and R ₂ to free thread guide in the range of 100 mm to 200 mm are executed. This makes it possible to maintain a relatively uniform thread temperature at the threads within the entire relaxation zone. The relaxation distances between the Galette shells 5.2 and 5.3 and 5.3 and 5.4 are designed according to the arrangement of the godets in the range of 30 mm to 150 mm.

In order to obtain rapid and intensive heating during the multi-stage thermal treatment for relaxing the threads, the group of threads in the first relaxation section Ri is guided at a differential speed to produce a thread tension. In that regard, the first free Relaxierstrecke is used essentially for the thermal equalization of the temperatures within the filament bundles. The reduction of the internal stresses takes place essentially in the second relaxation path R ₂ between the third godet casing and the fourth godet casing. For this purpose, the threads are guided substantially stress-free, wherein the peripheral speeds of the two godet coats are preferably formed equal in size. In order to continue the voltage reduction, the peripheral speed of the fourth godet casing 5.4 is preferably selected to be greater than a circumferential speed on the downstream guide casing 15.1 of the following guide roller 14.1. In that regard, the group of threads slides with a slight tradition in the Nachfolgepro- zess.

In the further course, the threads of the group of yarns 19 are wetted by the preparation device 22 with a fluid after the voltage has been dissipated, and then individually swirled in the swirling device 23. The method according to the invention and the device according to the invention are particularly advantageously suitable for producing fully drawn threads (FDY) with fine titers. Here, both polyester and polyamide can be used as thread material. In the embodiment of the device according to the invention shown in Fig. 1 and 2, the threads are removed after cooling substantially in the dry state for stretching. In principle, however, it is also possible to apply to the threads after cooling a light, low-water preparation application.

The illustrated in Fig. 1 and 2 embodiment of the godet assembly is also exemplary. FIG. 4 shows a further exemplary embodiment of a godet arrangement, as could be used, for example, underneath the spinning device according to the exemplary embodiment according to FIG. In this embodiment, two guide rollers 14.1 and 14.2 are provided in the inlet in front of the first godet 4.1, each having a driven guide sheath 15.1 and 15.2. The guide shells 15.1 and 15.2 are each made smaller in diameter than the godet sheaths 5.1 to 5.4. The guide sheaths 15.1 and 15.2 are made unheated. By the guide sheaths 15.1 and 15.2, a bias on the yarn sheet 19 is generated to already get an intense contact on the circumference of the first godet shell 5.1. In that regard, by arranging such guide rollers, intensive contact for tempering the yarn sheet 19 on the first godet casing 5.1 can be produced.

In the embodiment shown in FIG. 4, the first godet sheath 5.1 of the godet 4.1 is arranged in a first godet box 16 and the godet sheaths 5.2 to 5.4 in a second godet 11, wherein the godet 11 has a heat insulation 17 to the environment. The godet boxes 11 and 16 form a unit and are connected via a Durchlas opening 18 to the thread guide.

For thread guidance, the godet box 16 furthermore has on a top side a slot-shaped inlet opening 12 and the godet box 11 on a bottom side a slot-shaped outlet opening 13.

The godet 4.1 is designed with a heating device, not shown here, which can heat the godet shell 5.1 optionally to a surface temperature of 40 ° C to a maximum of 80 ° C, or can leave by deactivating the heater at room temperature. Thus, the thread can be carried out before stretching at low temperatures, which evened out the formation of draw points, especially in the filament composite to a high degree. The choice of Niedertemperarturen depends on the type of polymer.

At the following godets 4.2 to 4.3, a thermal aftertreatment of the threads is carried out for relaxation, as already described for the embodiment of FIGS. 1 and 2.

The method according to the invention and the device according to the invention are particularly suitable for producing a large number of threads in parallel with substantially identical physical properties.

Claims

Patent claims

Process for producing synthetic fully drawn threads (FDY) by drawing and relaxing freshly spun threads, in which the spun threads, after cooling and solidification, are guided together as a group of threads on the circumference of several driven godet casings, in which the threads surround the godet casings with a partial wrap of less than 360° contact, in which the threads on the surfaces of the godet jackets are thermally treated and in which the threads between the godet jackets are guided freely with at least a speed difference between the godet jackets, characterized in that the threads between a first heated godet jacket and a second heated godet jackets are guided and stretched in a free tension section, with the threads receiving a thermal pretreatment with a surface temperature of the first godet jacket of 40 ° C to 80 ° C before stretching or with the threads being guided at room temperatures before stretching.

Method according to claim 1, characterized in that the threads for stretching are guided in the free tension section with a free thread length in the range of 150 mm to 350 mm.

3. The method according to claim 1 or 2, characterized in that the threads are guided and relaxed between the second godet jacket and a third godet jacket in a first free relaxation section and between the third godet jacket and a fourth godet jacket in a second free relaxation section, the threads within the relaxation sections each with a free thread length in the range of 100 mm to 200 mm.

4. The method according to any one of claims 1 to 3, characterized in that, for relaxation, the threads receive a thermal treatment in several stages, each with a surface temperature of one of the subsequent godet jackets of 100 ° C to 250 ° C.

5. Method according to one of claims 1 to 4, characterized in that the threads are guided in the first free relaxation section between the second godet jacket and the third godet jacket with a thread tension generated by a differential speed.

6. The method according to claim 5, characterized in that the threads are guided with low tension in the second relaxation section between the third godet jacket and the fourth godet jacket.

7. The method according to claim 5 or 6, characterized in that the threads after relaxation with a transfer of the fourth godet jacket is guided relative to a follow-up godet and/or relative to a winding machine.

Device for producing synthetic fully drawn threads (FDY) by drawing and relaxing several freshly spun threads, with a spinning device (1) and a cooling device (2) for spinning several threads, with several godets (4.1 - 4.4), on their drivable godet jackets (5.1 - 5.2) the threads are guided as a group of threads, each with a partial wrap of less than 360°, the godet jackets (5.1 - 5.2) being designed to be heated separately and at least one speed difference between peripheral speeds of the godet jackets (5.1 - 5.4) being adjustable, characterized in that between a first godet jacket (5.1) and a second godet jacket (5.2) a stretching distance (G _s ) is formed for completely hiding the threads, the first godet jacket (5.1) being heated to a surface temperature of 40 by a separate heating means (8.1). ° C can be heated up to 80 ⁰ C or cannot be heated.

Device according to claim 8, characterized in that the stretching distance (G _s ) between the first godet jackets (5.1) and the second godet jackets (5.2) has a size in the range of 40 mm to 200 mm.

10. Device according to claim 8 or 9, characterized in that between the second godet jacket (5.2) and a third godet jacket (5.3) there was a first relaxation distance (G _R1 ) and between the third godet jacket and a fourth godet jacket there was a second relaxation distance (G _R2 ) is designed, with the relaxation distance between adjacent godets (4.2 - 4.4) having a maximum size of 150 mm.

11. The device according to claim 10, characterized in that the relaxation distance between the godet jackets (5.2 - 5.4) is of the same size or of different size.

12. Device according to one of claims 8 to 11, characterized in that the godet jackets (5.1 - 5.2) of the godets (4.1 - 4.4) are of the same size in diameter for heat treatment of the threads.

13. Device according to one of claims 8 to 12, characterized in that a thermal insulation (17) with a thread passage opening (18) is formed between the first godet jacket (5.1) and the second godet jacket (5.2).

14. Device according to one of claims 8 to 13, characterized in that the second godet jacket (5.2), the third godet jacket (5.3) and the fourth godet jacket (5.4) together in a godet box (11) with the thermal insulation tion (17) are arranged.

15. Device claim 14, characterized in that the first godet jacket (5.1) is arranged encapsulated in a second godet box (16).

16. Device according to one of claims 8 to 15, characterized in that the first godet jacket (5.1) and the second godet jacket (5.2) are each assigned separately controllable godet drives (6.1, 6.2, 7.1, 7.2) and that the third godet jacket ( 5.3) and the fourth godet jacket (5.4) have a common godet drive

(6.3, 6.4, 7.3) is assigned.

17. Device according to one of claims 8 to 16, characterized in that on an inlet side of the first godet (4.1) two guide rollers (14.1, 14.2), each with a driven guide jacket (15.1, 15.2), are provided, which correspond to the first godet jacket (5.1). are upstream.