EP2456913B1 - Method for melt-spinning, drawing, and winding a multifilament thread and a device for performing the method - Google Patents

Description

The invention relates to a method for melt-spinning, drawing and winding a multifilament yarn into a FDY yarn and to an apparatus for carrying out the method according to the preamble of claim 9.

A generic method for melt spinning, drawing and winding a multifilament yarn and a generic device for performing the method are, for example, from DE 21 18 316 A1 known.

In the production of synthetic threads, in particular for textile applications, it is generally known that the multifilament yarns are more or less drawn after melt-spinning, depending on the type of yarn to be produced. Depending on the degree of stretching, a distinction is made here between so-called POY yarns or FDY yarns. The POY yarns (Pre Oriented Yarn) have a pre-oriented, not yet finished stretched structure and are usually further processed in a second process step, for example, a false twist texturing to a final yarn. In contrast, the FDY yarns (Full Drawn Yarn) are completely stretched and can be used directly for the further processing of a flat textile product.

The drawing of the synthetic threads is carried out by driven guide shells of several godets, wherein the threads are guided with contact on the circumference of the guide shells. The guide shells of the godets are at least partially heated to heat the threads for stretching or relaxation. Since, on the one hand, high draws require correspondingly high differential speeds between the guide shells of the godets, and, on the other hand, the heating of the yarns takes place through contact with the heated guide shells, at high speeds, large contact lengths between yarns are required and guide sheath required for heating the threads. For this reason, usually used for pulling and drawing synthetic threads to fully drawn yarns godet duo, which have two coiled with identical peripheral speed guide sheaths and lead the thread with multiple wraps. Such a method and such a device are for example from DE 21 18316A1 known.

In the known method and in the known device, the filaments are treated after extrusion with a low-water lubricant and then withdrawn through several Galettenduos and stretched. For this purpose, each of the godet duo has two driven guide shells on which the filament bundle is guided with several wraps. In that regard, the guide shells of one of the godet ducks cooperate to perform a thermal treatment on the filament bundle and to create a tension on the filament bundle for drawing or drawing. The number of wraps on the guide shells are chosen in relation to the speeds such that after the filament bundle of the guide sheath, the desired stretching temperature and the required tensile stresses in the thread are reached. In principle, however, any contact between the filament bundle and a guide surface leads to frictional effects, which due to the multifilament structure of the filament bundle can cause unevenness in the individual filaments.

From the DE 31 46 054 A1 is a method and apparatus for pulling and stretching a multifilament thread is known, in which the filament bundle is wetted before peeling using a commercially available spin finish and is passed to pull off with simple wrap on the guide shell of a single galette. The guide sheath is not heated, so that the thread is stretched cold in the following zone. The usual for FDY yarn thermal aftertreatment to adjust a boiling shrinkage takes place by multiple entangled godets of a subsequent godet duo. such However, cold-drawn threads generally have the disadvantage that very high stretching forces must be generated, which lead to considerable problems, in particular in the production of a plurality of parallel-guided filament bundles. In addition, long-protruding godets for thermal aftertreatment are required to ensure sufficient heating of the filament bundle.

From the DE 35 08 955 A1 is already an arrangement for stripping and stretching a synthetic thread with several individually driven godets known. However, the composition of the preparation fluid is not specified and a relationship between the water content in the preparation fluid and the processes during heating of the thread is not apparent.

From the JP 60 151312 A Also, several individual godets are known for stripping and stretching a synthetic thread. In this document, the use of anhydrous spin finish is described, which are not well suited for many applications, however, because a proportion of water is beneficial for the wetting of all filaments of a synthetic thread with a spin finish. An indication of the relationship between the composition of the spin finish and the heating process of the thread or the contact properties on a godet surface is not found.

Also the DE 199 27 916 A1 Although it mentions different preparation fluids with their properties and preferred applications, it also contains no teaching which would establish a connection between the water content of a fluid and subsequent heating processes on a thread.

In the prior art, however, such methods and devices are generally known in which the heating of the thread takes place without contact by means of radiant heater. For example, from the WO 2007/115703 A1 a method and an apparatus for pulling and stretching a multifilament yarn described in which or the filament bundle with easier Looping is guided on the guide shells of the godets. Here, free treatment zones are formed between the guide shells, which are used for heating the filament bundle by radiant heater. Such methods and devices thus require larger free tracks of the filament bundle to allow for sufficient temperature at high speeds.

It is therefore an object of the invention to provide a method for melt spinning, drawing and winding a yarn to a FDY yarn and a device for carrying out the method of the type mentioned in such a way that the leadership and the heating of the filament bundle to complete stretching as gently as possible and with as uniform as possible treatment of all filaments of the filament bundle.

Another object of the invention is to provide a method and a device of the generic type, with which a plurality of parallel-spun filament bundles are possible to produce in a compact arrangement.

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

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

The invention is based on the finding that both the thread material and the preparation fluid must be heated equally when the multifilament yarn is heated. Thus, before heating the prepared thread, the water content is first evaporated and dissolved out of the filament composite. From the teaching of DE 21 18 316 A1 Although it can be seen that the reduction of the water content favorable to the stretching of the filament bundle However, still requires a conventional thread guide through multiple wraps of godets godet.

In the search for a solution, a considerable reservation initially arose. Thus, it is well known that to fully stretch the filament bundle on the guide shells of the godets significant tensile forces must be absorbed to prevent slippage between the filament bundle and the guide shells. Thus, in particular in the production of FDY yarns looping angles are set on the godets, which require multiple wrapping.

The invention has recognized, however, that the heating of the filament bundle can be intensified to a high degree by limiting the water content in the preparation oil to a maximum of 8% and by mutual contact of the filament bundle with the guide shells of the godets. For example, in the case of hot drawing, the position of the hiding point (neck point) can be made very limited, which has a favorable effect on the required stretching forces. However, the thermal aftertreatment for adjusting the boiling shrinkage is particularly advantageous both in the case of hot drawing or, in particular, in the case of cold drawing, which takes place according to the invention by simply looping guide shells of the godets. Furthermore, a thread guide with mutual contact on the guide shells of the godets offers the possibility of setting very large wrap angles to individual guide shells. Therefore, relatively high drawing forces can be generated without unwanted slip phenomena even with simply looped leadership coats, so that multiple threads can be stretched parallel to each other in the cold state. According to the invention, the filament bundle is removed after wetting with the preparation oil with a very low water content of at most 8% at a withdrawal speed of above 1200 m / min by a simple Teilumschlingung the filament bundle on optionally heated guide coats several driven godets. The stretching of the filament bundle in a drawing stage with a stretching speed above 3500 m / min is then carried out by a simple Teilumschlingung of the filament bundle to downstream guide coats multiple driven godets, the guide shells are designed to relax and Schrumpeinstellung heated.

Such a thread guide also has the advantage that the filaments of the filament bundle have a very high uniformity of their physical properties. Thus, essentially all filaments are brought into contact with one of the guide shells by a mutual wrapping of the filament bundle, so that they have the same history with regard to frictional contact and thermal contact.

To carry out the method, the device according to the invention provides that the guide shells of the driven godets for pulling off the filament bundle form a first godet group whose guide sheaths are arranged to a yarn path with simple Teilumschlingung and optionally heated, and that the guide shells of the driven godets for drawing a form second godet group whose heated guide coats to a Thread course are arranged with simple Teilumschlingung, wherein between the two godet groups, a draw zone is formed. This makes it possible to realize very compact devices for stretching and relaxing, which is particularly suitable for guiding a group of yarns. Thus, even at very short guide coats several threads can be performed in parallel side by side with simple Teilumschlingung.

In order for a sufficient yarn tension can be generated during the removal and stretching of the filament on the one hand and on the other hand to ensure a slip-free guidance of the filament bundle on the guide shells of godets, the process variant is particularly advantageous in which the filament bundle on the guide shells of the godets each with a wrap angle of > 180 ° is guided.

For this purpose, the guide shells of the godets are arranged to a yarn path, each with a simple Teilumschlingung with a wrap angle> 180 °, with adjacent godets preferably have oppositely driven guide shells. This makes it possible in particular to realize a thread guide with alternating looping on the guide sheaths of one of the godets.

Since the water content within the spin finish oil is mainly used for dilution and to improve the flow properties of the spin finish oil, the spin finish oil with a water content of <8% has a higher viscosity. Nevertheless, to improve the flow properties for wetting the filaments and the filament bundle is the process variant preferably used, in which the preparation oil is heated before being applied to the filament bundle.

For this purpose, the device according to the invention has a heating means which is assigned to the preparation device for heating the preparation oil. in this connection For example, the metered quantity of the preparation oil supplied via a metering pump is preferably heated shortly before wetting.

On the one hand to obtain a homogenization of the preparation oil and on the other hand to produce a possible band-shaped spreading of the filaments within the filament bundle, the filament bundle is guided by a yarn brake according to an advantageous embodiment of the invention. For this purpose, the yarn brake is arranged directly upstream of the godets of the first godet group.

For the production of FDY yarns for textile applications with relatively low Fententitern the process variant has proven particularly useful in which for withdrawing with or without heating the filament bundle of thread with contact in an S-shaped or Z-shaped Teilumschlingung to two leaders of a first Galettenduos to be led.

For this purpose, the device according to the invention has a first godet group, which is formed by a first pair of godets with two optionally heated guide shells.

The process variant in which the filament bundle is given a thermal aftertreatment for stretching and relaxing, and the yarn is guided with contact in an S-shaped or Z-shaped partial looping to two heated guide shells of a second godet tail, is preferably carried out. In so far, the number of godets for stripping and stretching can be reduced to a minimum, even with simple Teilumschlingung. The leading coats of the godets are powered by counter-rotating electric drives.

In order to be able to perform a sufficient relaxation of the filament bundle after stretching, in particular at high yarn speeds, the method variant is provided in which the filament bundle is additionally heated without contact by thermal radiation of a radiant heater.

For this purpose, at least one radiant heater can be assigned to one of the godets of the second godet group or arranged next to one of the godets.

For the further processing of the thread, it is necessary that the filament bundle has a sufficient thread closure, which are usually produced by so-called entanglement nodes, which occur during the swirling of the filament bundle. In order to set an optimal for the swirling thread tension on the filament bundle, which is in particular independent of the preceding process steps and subsequent process steps, the filament bundle is vortexed before winding in a tensioned between two driven godets thread piece according to an advantageous embodiment of the invention, wherein the swirl generates a number of at least 10 interlacing knots per meter of thread length. By adjusting the speed differences of the two godets can thus adjust an optimal for the swirling thread tension. The downstream process steps such as winding can be performed with an independent winding tension.

The manufacture of the thread closure prior to winding of the thread is carried out in the apparatus according to the invention by a swirling device which is arranged upstream of the take-up device, wherein the swirling device is assigned to a feed side and a discharge side in each case a driven godet. Thus, the desired thread tensions can be adjusted by controlling the individual drives of the godets.

However, it is also possible to improve the thread closure before winding by further wetting of the thread. Thus, the development of the device according to the invention is particularly suitable for this purpose, in which the Preparation device comprises two separate preparation stations for preparing the filament bundle, wherein a first preparation station is assigned to the collective thread guide and wherein a second preparation station between the second godet group and the take-up device is arranged. The preparation amount can thereby be fed to the thread in several partial preparation jobs. Thus, a first partial preparation could be supplied to the filament bundle immediately after spinning and before stretching. Hereby, a very small amount of dissecting agent would be used to improve the running characteristics of the thread guide yarn and the guide sheaths. The wetting required for the aftertreatment of the thread could then take place after stretching and before winding in a second part preparation.

The inventive method and the inventive apparatus for performing the method are described below with reference to some embodiments of the device according to the invention with reference to the accompanying figures below.

Fig. 1

schematisch eine Seitenansicht eines Ausführungsbeispiels der erfindungsgemäßen Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens

They show:

Fig. 1

schematically a side view of an embodiment of the device according to the invention for carrying out the method according to the invention

In Fig. 1 an embodiment of the device according to the invention for carrying out the method according to the invention for the production of a FDY game is shown in a view.

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

The spinning beam 1 carries on its underside a plurality of spinnerets 3 in order to simultaneously spin a plurality of threads parallel to each other. The spinning beam 1 is aligned transversely to the plane of the drawing, so that in Fig. 1 only one of the spinnerets 3 is visible. The following devices and units are therefore explained in more detail only by means of a threadline. Basically, each of the five threads created parallel to each other is treated the same.

Below the spinning beam 1, a cooling device 6 is provided, which is formed from a cooling shaft 8 and a blowing device 7. The cooling shaft 8 is arranged below the spinneret 3 in such a way that the multiplicity of filaments 4 extruded through the spinneret 3 pass through the cooling shaft 8. About the blowing device 7 can generate a cooling air flow, which is introduced into the cooling shaft 8, so that the extruded through the spinneret 3 filaments 4 are cooled uniformly by the cooling air flow.

Below the cooling shaft 8, a collection yarn guide 7 and a preparation device 16 are provided to merge the filaments 4 into a filament bundle 5. For this purpose, the collecting yarn guide 9 is arranged centrally below the spinneret 3, so that the filaments 4 are brought together uniformly in the collecting yarn guide 9. In this case, a preparation oil is fed to the filaments in order to obtain a uniform wetting of all filaments within the filament bundle 5. The preparation oil has a very small proportion of water, which is preferably below 8%. In order to obtain a uniform distribution within the filament bundle 5 despite a relatively high viscosity of the preparation oil in the range of 90 to 100 cS (centi-Stokes), the preparation oil is heated in this embodiment before wetting. The preparation device 16 is connected via a metering 19 with a Metering pump 17 is connected, through which a from a tank (not shown here) sucked preparation oil of the preparation device 16 is supplied. Between the metering pump 17 and the preparation device 16, a heating means 18 is provided to heat the preparation oil. The heated preparation oil has a lower viscosity and can be used directly for wetting the filament bundle.

However, it is also possible to apply the spin finish agent independently of one another in a plurality of separate part preparations, so that initially a very small amount can be fed to the filament bundle after spinning. Thus, in the embodiment according to Fig. 1 two separate preparation stations 16.1 and 16.2 shown in dashed lines, wherein a first preparation station 16.1 is assigned to the collecting yarn guide 9 and wherein a second preparation station 16.2 between a second godet group 13.2 and a take-up device 23 is arranged. The preparation amount can thereby be fed to the thread in several partial preparation jobs. Thus, a first partial preparation could be supplied to the filament bundle immediately after spinning and before stretching. Here, a very small amount of lubricant would be used to improve the running properties of the thread on the thread guides and the guide sheaths. The wetting required for the aftertreatment of the thread could then take place after stretching and before winding in a second part preparation. In principle, it would also be possible to use spin finish preparations with a substantially higher water content.

Below the cooling shaft 8, an adjacent chute 10 is arranged with an inlet yarn guide 11 arranged on the outlet side. Within the chute 10, the filament bundles 5 are brought together starting from a determined by the spacing of the spinnerets 3 spinning division to a treatment distance. For this purpose, the filament bundles 5 are first brought by the inlet yarn guide 11 in the treatment distance to each other, so that the filament bundles 5 are parallel to each other with a short distance in the range of 3 to 8 mm feasible.

Below the chute 10, a first godet group 13.1 is arranged with a plurality of driven godets 20.1 and 20.2. The godets 20.1 and 20.2 of the godet group 13.1 are designed as a pair of godets with two guide shells 14.1 and 14.2. The godet duo 13.1 has two guide shells 14.1 and 14.2 driven at the same peripheral speed. The guide shells 14.1 and 14.2 of the godet 13.1 are arranged one above the other and are each driven by separate electric motors (not shown). The electric motor of the guide casing 14.1 is designed left-handed and drives the guide casing 14.1 counterclockwise. The electric motor of the guide casing 14.2 is designed to rotate clockwise and drives the guide casing 14.2 clockwise. Thus, the guide sheaths 14.1 and 14.2 rotate in opposite directions. In the case of a hot drawing, each of the guide sheaths 14.1 and 14.2 has a heater, not shown here, in order to heat the guide sheaths 14.1 and 14.2.

To pull off the filament bundle 5 from the spinning zone, the first godet duo 13.1 is preceded by a yarn brake 12 in the yarn path. The yarn brake 12 is formed in this embodiment by a plurality of pulleys, which are freely rotatably mounted. The filament bundle 5 is guided in each case with a partial looping on the deflection rollers, the filaments of the filament bundle 5 going into a band-shaped arrangement. As a result, the oil application on the filaments can be made uniform and, moreover, the filament bundle 5 with a band-shaped arrangement of the filaments is guided to the guide casing 14.1 of the first godet group 13.1. This ensures a uniform contact of all filaments with the surface of the guide casing 14.1

The first godet group 13.1 is used to pull off the filament bundles 5. For this purpose, the filament bundles 5 with a simple Teilumschlingung to the guide shells 14.1 and 14.2 of the godets 20.1 and 20.2 out. The filament bundle 5 wraps around the guide shells 14.1 and 14.2 alternately in an S-shaped yarn path. The guide shells 14.1 and 14.2 are arranged such that in each case a wrap angle of> 180 ° adjusts the guide sheaths 14.1 and 14.2 in the yarn path.

In the yarn path of the first godet group 13.1 is a second godet group 13.2 downstream with multiple driven godets 20.3 and 20.4 for stretching the filament bundles 5, wherein between the godet groups 13.1 and 13.2 a stretching zone is stretched. The second godet group 13.2 is also formed in this embodiment by a pair of godets with the driven godets 20.3 and 20. 4. The second galette duo 13.2 is in this case constructed identically to the first galette duo 13.1. Thus, the guide sheaths 15.1 and 15.2 are driven by separate electric motors. The electric motor of the guide casing 15.1 is designed left-handed and drives the guide casing 15.1 counterclockwise. The electric motor of the guide casing 15.2 is designed to rotate clockwise and drives the guide casing 15.2 clockwise. Thus, both guide coats 15.1 and 15.2 of the godet 13.2 are also driven in opposite directions. Each of the guide sheaths 15.1 and 15.2 is also assigned a separate heating device (not shown here), so that the guide sheaths 15.1 and 15.2 could be heated at different temperatures.
The godet groups 13.1 and 13.2 are arranged within a godet box 21. For this purpose, the filament bundle 5 is guided via an inlet of the godet box 21 and via an outlet of the godet box 21.

For driving the guide shells 14.1 and 14.2 of the first godet duet 13.1 and the guide sheaths 15.1 and 15.2 of the second godet 13.2 the associated electric motors are controlled by two separate engine control units (not shown here). Each pair of godets 13.1 and 13.2 is assigned to one of the engine control units. So will be a left-handed electric motors and a dextrorotatory electric motor for driving the guide shells 14.1 and 14.2 operated together via the engine control unit with the same drive speeds. With the same outer diameters of the guide sheaths 14.1 and 14.2 they are driven at identical circumferential speeds.

At this point it should be mentioned that the constructive structure of the godet duo is exemplary. In principle, other design principles for driving and heating a guide jacket can be used. Thus, a heating of at least one of the guide shells is also passively possible by heat convection and heat radiation from the outside. Thus, the godet duos are arranged in the godet box 21 in order to avoid in particular heat losses. The resulting within the godet box 21 heat energy due to an actively heated guide jacket could be used to warm the adjacent non-actively heated guide shell. In addition, there is also the possibility within the godet box additional heat sources such as an infrared heater to arrange, which directly heats a thread or the thread on the surface of the guide shell. Such a heat source is in the FIG. 1 shown by dashed lines and indicated by the reference numeral 32.

Below the godet box 21, a further driven godet 20.5 is arranged which cooperates with a godet 20.6 arranged above the take-up device 23. The second godet 20.2 is also coupled to a drive. Between the godets 20.5 and 20.6, a swirling device 33 is arranged in the tensioned thread piece in order to produce a thread closure in the thread 22 by forming interlacing knots. In this case, the thread tension for swirling the thread 22 can advantageously be determined by a differential speed set between the godets 20.5 and 20.6.

Below the godets 20.5 and 20.6, the winding device 23 is arranged. The winding device 23 is in this embodiment by a so-called Spulrevolvermaschine formed, which has a rotatable spindle support 29 with two freely projecting winding spindles 27.1 and 27.2. The spindle carrier 29 is mounted in a machine frame 30. In this case, the winding spindles 27.1 and 27.2 can alternately lead into an operating range for winding a coil and into a change region for replacing the coil. In the machine frame a traversing device 25 and a pressure roller 26 is provided to wind the thread 34 to a coil 28. In this case, the pressure roller 26 engages with contact on the surface of the coil 28. The traversing device 25 has, for each of the threads, a traversing unit in which the thread is fed back and forth to form a cross-wound bobbin. Above the traversing device a head thread guide 24 is provided, through which the inlet of the thread is guided in the winding position. In this embodiment, the head thread guide 24 is formed by freely rotatable pulleys to redirect the running of the guide godet 20.2 thread from a substantially horizontal distribution plane out to the winding point. This makes it possible to avoid spreading the threads to both winding points, since the threads are usually performed on the godets with narrow thread spacing.

To produce a FDY yarn, the in Fig. 1 illustrated embodiment, a polymer melt, for example, from a polyester or a polyamide supplied to the spinning beam 1. Within the spinneret 3, the polymer melt is forced under pressure through the nozzle bores formed at the bottom of the spinneret 3 to extrude a plurality of filaments. Within the cooling chute 8, the filaments are cooled to a temperature below the glass transition temperature of the thermoplastic material so that solidification and preorientation occurs on the filaments. After cooling of the filaments 4, these are combined to form a filament bundle 5, wherein a preparation oil having a maximum water content of 8%, is supplied, so that the filaments 4 of the filament bundle 5 are held together.

In order to remove a multifilament yarn from a spinning device and draw it by means of a hot drawing to a FDY yarn, the fiber bundle 5 is first pulled off the guide casing 14.1 of the godet 13.1 and guided in an S-shaped yarn path around the guide casing 14.1 and the adjacent guide casing 14.2. The filament bundle 5 is guided with a single wrap so first with an inner side of the guide casing 14.1 with contact and then guided by changing the wrapper with its outside on the surface of the guide casing 14.2 with contact. As a result, the internal and external filaments in the filament bundle 5 can be brought into direct contact alternately with the heated surface of the guide sheaths 14.1 and 14.2.

In this embodiment, the guide shells 14.1 and 14.2 are designed with an equal outer diameter, wherein the arrangement of the godet groups 13.1 and 13.2 is selected so that the wrap angle of the filament bundle 5 on the guide shells 14.1 and 14.2 each exceeds a value of 180 °. In principle, different angles of wrap can be formed on the guide sheaths 14.1 and 14.2, depending on the godet arrangement. In addition, a Z-shaped looping of the guide shells 14.1 and 14.2 would be possible with a mirror image feeding the thread.

In order to heat the thread material to a temperature which is above the gas conversion temperature, the guide shells 14.1 and 14.2 are heated in this embodiment with the same surface temperatures, which are in the range of 80 ° C to 200 ° C. For example, the glass transition temperature of, for example, a polyester is in the range of 80 ° C.

However, it is also possible to set the surface temperatures of the guide sheaths 14.1 and 14.2 differently. This is particularly necessary in cases where by the simple wrapping of the filament bundle 5 on the guide shells 2.1 and 2.2 different contact lengths, for example, due to different diameter of the guide shells or due to different wrap angle is present on the guide shells.

In the case of a cold drawing, the guide shells 14.1 and 14.2 of the first godet group 13.1 are not heated. However, the guidance of the filament bundle 5 is identical, so that the description given above applies.

The second godet group 13.2 is arranged independently of a hot drawing or a cold drawing laterally next to the first godet group 13.1, wherein the filament bundle 5 is stirred after expiration of the guide sheath 14.2 directly to the lower guide sheath 15.1 of the godet 13.2. Thus, between the guide sheaths 14.2 of the first godet 13.1 and the guide sheath 15.1 of the second godet 13.2 a draw zone is formed, in which the filament bundle 5 is stretched. For this purpose, the guide sheath 15.1 and 15.2 of the second godet 13.2 is driven at a higher peripheral speed than the guide shells 14.1 and 14.2 of the first godet 13.1. The filament bundle 5 is guided around in a S-shaped wrap around the guide sheaths 15.1 and 15.2 of the second godet, so that the filament bundle 5 can be guided overall with simple looping in the godet arrangement. This makes very compact and short guide coats in the godet groups 13.1 and 13.2 executable.

The godet duo 13.2 is constructed essentially identical to the godet duo 13.1, so that the guide sheaths 15.1 and 15.2 have an equal outside diameter. Here, each of the guide sheaths 15.1 and 15.2 forms a wrap angle, which usually exceeds the value of 180 °. In order to initiate a thermal after-treatment of the drawn yarn directly in the second godet group 13.2, the guide sheaths 15.1 and 15.2 are heated to a surface temperature in the range from 80 to 200 ° C. In this embodiment, the surface temperatures are set equal. In principle, however, it is also possible here to form different surface temperatures on the guide sheaths 15.1 and 15.2 in order, for example, to compensate for contact lengths between the thread and the guide sheaths. As a rule, the surface temperatures of the guiding sheaths 15.1 and 15.2 are set higher than the surface temperatures of the guiding sheaths 14.1 and 14.2. This is due to the fact that different temperatures are required to trigger thread-specific processes and of course the peripheral speeds of the guide sheaths 15.1 and 15.2 are significantly higher than the guide speeds of the guide shells 14.1 and 14.2, so that shorter residence times on the surfaces of the guide sheaths are achieved the godet duo 13.1 preferably with a guide speed in the range of 1200 m / min. up to 3,500 m / min. driven. The second pair of godets 13.2 is at a guide speed in the range of 3,500 to 6,000 m / min.

For shrinkage treatment after the drawing of the thread, a speed difference between the guide sheaths 15.1 and 15.2 is preferably set, which can be realized at the same drive speeds by different outer diameter or alternatively is set by different drive speeds of the associated electric motors.

In order to carry out an intensive thermal aftertreatment even at very high speeds, the filament bundle 5 can additionally be heated contactlessly by one or more radiant heaters. The radiant heaters could be arranged in one of the godets 20.3 or 20.4 or in the yarn path next to the godets 20.3 and 20.4 of the second godet group. In Fig. 1 is exemplified within the godet box 21 laterally next to the godet group 13.2 a radiant heater 32 shown in dashed lines. The filament bundle 5 can thus be kept warm after the passage of the guide sheath 15.2 of the godet 20.4 or even further warm.

Prior to winding the fully drawn yarn 22, the thread closure is fixed by a swirler 33 in which a plurality of interlace knots are created in the yarn 22. Thus, a minimum number of 10 knots per running meter of thread length is generated in the FDY yarn.

In the winding device 23, the thread 22 is wound together with the threads produced in parallel to form coils 28 which are held side by side on one of the winding spindles.

The method according to the invention and the device according to the invention are characterized in particular by a low energy input in order to carry out a drawing of the threads. Thus, the filament bundle can be heated in a shorter time and with less energy to a stretching temperature, even at the usual high production speeds up to 6,000 m / min. and above.

It should be expressly stated at this point that the formation of the godet groups as a godet pair for drawing off and stretching the filament bundle into an FDY yarn is exemplary. Thus, more than two godets can be arranged within the godet group. It is essential here that the guide shells of the godets within one of the groups are driven at substantially the same peripheral speeds.

LIST OF REFERENCE NUMBERS

1

spinning beam

2

melt inlet

3

spinneret

4

filaments

5

filament bundles

6

cooling device

7

blowing device

8th

cooling shaft

9

Collecting yarn guides

10

chute

11

Inlet yarn guide

12

thread brake

13.1, 13.2

Galettengruppe; godet duo

14.1, 14.2

guide sheath

15.1, 15.2

guide sheath

16

preparation device

16.1, 16.2

preparation station

17

metering

18

heating

19

dosing

20.1-20.6

Galette

21

Galettenbox

22

thread

23

takeup

24

Yarn guide

25

Traversing device

26

pressure roller

27.1, 27.2

winding spindle

28

Kitchen sink

29

spindle carrier

30

machine frame

31

winding tube

32

radiant heater

33

swirling

Claims (15)

1. A method for melt-spinning, drawing and winding up a multifilament thread to form an FDY yarn, having the following steps:

   1.1 extruding a multiplicity of filaments from a thermoplastic melt;

   1.2 cooling the filaments by means of a cooling air flow to a temperature below the glass transition temperature of the thermoplastic material;

   1.3 combining the filaments to form a filament bundle with a finishing oil being supplied having a very low proportion of water, namely at most 8%;

   1.4 drawing off the filament bundle at a take-off speed of above 1200 m/min, with or without thermal energy being supplied to heat the filament bundle, by a single partial looping of the filament bundle on at least one optionally heated guide casing of a driven godet;

   1.5 drawing the filament bundle in a drawing stage at a drawing speed of above 3500 m/min by a single partial looping of the filament bundle on guide casings of a plurality of driven godets, with thermal energy being supplied by the heated guide casings of the godets in order to relax the filament bundle, wherein the filament bundle is guided at the guiding cases in each case with a looping angle of greater than 180°;

   1.6 winding up the thread to form a bobbin.
2. The method as claimed in claim 1,
   characterized in that
   the finishing oil is heated before application to the filament bundle.
3. The method as claimed in one of claims 1 to 2,
   characterized in that,
   after being wetted with the finishing oil, the filament bundle is guided through a thread brake in order to even out the application of oil.
4. The method as claimed in one of claims 1 to 3,
   characterized in that
   in order to be taken off with or without the filament bundle being heated before drawing, the thread is guided in contact in an S-shaped or Z-shaped partial looping on two optionally heated guide casings of a first godet pair.
5. The method as claimed in one of claims 1 to 4,
   characterized in that
   in order to draw and relax the filament bundle, the thread is guided with contact in an S-shaped or Z-shaped partial looping on two heated guide casings of a second godet pair.
6. The method as claimed in one of claims 1 to 5,
   characterized in that
   the filament bundle is additionally heated without contact by heat radiation from a radiant heater.
7. The method as claimed in one of claims 1 to 6,
   characterized in that,
   before it is wound up, the filament bundle is intermingled in a thread piece tensioned between two godets, and in that the cohesion of the filaments in a thread is produced by at least 10 intertwining knots per meter of thread length.
8. An apparatus for carrying out the method as claimed in one of claims 1 to 8, having a spinneret (3) for extruding a plurality of filaments (4), having a cooling device (6) for cooling the filaments (4), having a finishing device (16) for applying a finishing oil onto the filaments (4), having a collective thread guide (9) for combining the filaments (4) to form a filament bundle (5), having a plurality of driven godets (20.1-20.4) having partially heated guide casings (14.1, 14.2, 15.1, 15.2) for taking off, heating and drawing the filament bundle (5), and having a winding-up device (23),
   characterized in that
   the guide casings (14.1, 14.2) of the driven godets (20.1, 20.2) for taking off and/or heating the filament bundle form a first godet group (13.1), the guide casings (14.1, 14.2) of which are arranged to form a thread run with single partial looping and are optionally heatable, and in that the guide casings (15.1, 15.2) of the driven godets (20.3, 20.4) for drawing and relaxing form a second godet group (13.2), the guide casings (15.1, 15.2) of which are heatable and are arranged to form a thread run with single partial looping, wherein a drawing zone is formed between the two godet groups (13.1, 13.2) and wherein the guide casings (14.1, 14.2, 15.1, 15.2) of the godets (20.1-20.4) are arranged to form a thread run with in each case single partial looping with a looping angle of greater than 180°.
9. The apparatus as claimed in claim 8,
   characterized in that
   adjacent godets (20.1, 20.2) have guide casings (14.1, 14.2) that are driven preferably in opposite directions.
10. The apparatus as claimed in claim 8 or 9,
    characterized in that
    the finishing device (16) has a heating means (18), by way of which the finishing oil is heatable before the filaments (4) are wetted.
11. The apparatus as claimed in claim 8 or 9,
    characterized in that
    a thread brake (12) is arranged upstream of the godets (20.1, 20.2) of the first godet group (13.1) in the thread run.
12. The apparatus as claimed in one of claims 8 to 11,
    characterized in that
    the first godet group is formed by a first godet pair (13.1) having optionally heated guide casings (14.1, 14.2), and in that the second godet group is formed by a second godet pair (13.2) having two heated guide casings (15.1, 15.2), wherein the filament bundle (5) is guidable on the guide casings (14.1, 14.2, 15.1, 15.2) of the godet pairs (13.1, 13.2) in the S-shaped or Z-shaped thread run.
13. The apparatus as claimed in one of claims 9 to 12,
    characterized in that
    there is provided at least one radiant heater (32), which is arranged between the godets (20.3, 20.4) or is assigned to one of the godets (20.4).
14. The apparatus as claimed in one of claims 9 to 13,
    characterized in that
    an intermingling device (33) is arranged downstream of the second godet group (13.2) in the thread run, said intermingling device (33) being held between two driven godets (20.5, 20.6).
15. The apparatus as claimed in one of claims 9 to 14,
    characterized in that
    the finishing device has two separate finishing stations (16.1, 16.2) for finishing the filament bundle, wherein a first finishing station (16.1) is assigned to the collective thread guide (9) and wherein a second finishing station (16.2) is arranged between the second godet group (13.2) and the winding-up device (23).

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