WO2011009498A1

WO2011009498A1 - Method for melt-spinning, drawing, and winding a multifilament thread and a device for performing the method

Info

Publication number: WO2011009498A1
Application number: PCT/EP2009/062643
Authority: WO
Inventors: Klaus Schäfer; Hansjörg MEISE; Detlev Schulz; Jochen Adler
Original assignee: Oerlikon Textile Gmbh & Co. Kg
Priority date: 2009-07-24
Filing date: 2009-09-29
Publication date: 2011-01-27
Also published as: EP2456913B1; CN102471936B; EP2456913A1; CN102471936A; JP2013500402A; JP5575238B2

Abstract

The invention relates to a method for melt-spinning, drawing, and winding a multifilament thread to form a fully-drawn yarn and to a device for performing the method. First, a plurality of filaments are extruded from a thermoplastic melt, cooled to a temperature below the glass transition temperature of the thermoplastic material, and joined to form a filament bundle by supplying a preparation oil having a water content of at most 8%. Then, the filament bundle is removed by a simple partial wrapping on optionally heated guiding jackets of several driven galettes at a speed above 1,200 m/min. For drawing and subsequent relaxation, the filament bundle is guided at a drawing speed above 3,500 m/min by a simple partial wrapping on the circumference of further heated guiding jackets of driven galettes. For this purpose, the device according to the invention comprises two galette groups having several driven galettes, wherein the first galette group guides the filament bundle in order to remove and/or heat the filament bundle by simple partial wrapping and the second galette group guides the filament bundle in order to draw the filament bundle by simple partial wrapping.

Description

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

A generic method for melt-spinning, stretching and winding a multi-filament yarn and a generic device for carrying out the method are known, for example, from DE 21 18 316 A1.

In the production of synthetic threads, in particular for textile applications, it is generally known that the multifilament threads are more or less stretched after melt-spinning, depending on the types 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 (Füll Drawn Yarn) are completely stretched and can be used directly for the further processing of a flat textile product.

The stretching of the synthetic threads is carried out by driven guide coats 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 godet duos are used for pulling and drawing synthetic threads into fully drawn yarns, which have two guide shells driven at identical peripheral speed and guide the yarn with several wraps. Such a method and such a device are known for example from DE 21 18 316 Al.

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 DE 31 46 054 Al a method and apparatus for pulling and stretching a multifilament thread is known, in which the filament bundle is wetted before peeling by means of a commercially available spin finish and is guided to pull off with simple looping on the guide shell of a single galette. The guide sheath is not heated, so that the

Thread is cold stretched in the subsequent zone. The usual for FDY yarn thermal aftertreatment to adjust a boiling shrinkage takes place by multiple entangled godets of a subsequent godet duo. Derar- However, cold-drawn filaments basically have the disadvantage that very high stretching forces have to be produced, 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.

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. Thus, for example, WO 2007/115703 A1 describes a method and a device for drawing off and stretching a multifilament yarn, in which the filament bundle is guided with simple looping on the guide sheaths 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 with the features of claim 1 and by an apparatus for performing the method with the features of claim 9. 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 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 Al, it can be seen that the reduction of the water content has a favorable effect on the stretching of the filament bundle, but still requires a conventional thread guide by multiple wraps of Galettenduos.

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 considerable tensile forces must be absorbed in order to avoid 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 is particularly advantageous for

- A - Position of the boiling shrinkage both in a hot drawing or in particular in a cold drawing, which is carried out according to the invention by simply entwined guide coats of 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 sheaths. 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 maximum of 8% water at a take-off 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 also carried out by a simple Teilumschlingung the filament bundle to downstream leaders coats multiple driven godets, the leadership coats 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 inventive device provides that the guide shells of the driven godets for pulling the filament bundle form a first godet group, the guide shells 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 on very short guide sheaths, several threads can be guided parallel to one another with simple partial looping.

On the one hand, sufficient thread tension can be generated during stripping and stretching of the filament bundle and, on the other hand, to ensure slippage-free guidance of the filament bundle on the guide sheaths of the godets, the method variant in which the filament bundle on the guide shells of the godets is particularly advantageous in each case a wrap angle of> 180 ° is performed. 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 preparation oil is mainly used for dilution and to improve the flow properties of the preparation oil, the preparation oil with a water content of <8% has a higher viscosity. In order nevertheless to improve the flow properties for wetting the filaments and the filament bundle, the method variant is 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.

In order 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, according to an advantageous development of the invention, the filament bundle is guided through a yarn brake. 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 this respect, the number of godets for stripping and stretching can be reduced to a minimum, even with simple partial wrapping. 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 of fahrensvariante provided in which the filament bundle is additionally heated without contact by heat 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 knots, which occur during the swirling of the filament bundle. In order to be able to set an optimum yarn tension for the interlacing on the filament bundle, which is in particular independent of the preceding process steps and the subsequent process steps, according to an advantageous development of the invention, the filament bundle is vortexed before being wound up in a yarn section stretched between two driven godets wherein the swirl generates a number of at least 10 interlacing nodes 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 device according to the invention by a swirling, which is arranged upstream of the take-up device, wherein the Verwirbelungseinrich- device is associated with a driven godet on an inlet side and a drain side. 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 collection leader and wherein a second preparation station between the second godet group and the winding device is arranged. The amount of preparation can thus be fed into 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 dissecting agent would be used to improve the running characteristics 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.

The method according to the invention and the device according to the invention for carrying out the method are explained in more detail below with reference to some exemplary embodiments of the device according to the invention with reference to the attached figures.

1 is a schematic side view of an exemplary embodiment of the device according to the invention for carrying out the method according to the invention

In Fig. 1, an embodiment of the inventive device for carrying out the inventive method for the production of a FDY yarn 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 plurality of nozzle openings and at its top a melt inlet 2. Of the

Melt feed 2 is exemplified with a melt source not shown here. linked 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 carry on its underside a plurality of spinnerets 3, at the same time to 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 thread guide 9 is arranged centrally below the spinneret 3, so that the filaments 4 are brought together uniformly in the collecting thread 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 from 90 to 100 cS (centi-Stokes), the preparation oil in this exemplary embodiment is heated prior to 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 exemplary embodiment according to FIG. 1, two separate preparation stations 16.1 and 16.2 are shown by dashed lines, a first preparation station 16.1 being assigned to the collecting thread guide 9 and a second preparation station 16.2 being arranged between a second godet group 13.2 and a winding device 23. 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. In this case, a very small amount of preparation agent 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, each with a partial wrap around the deflection rollers, wherein the filaments of the filament bundle 5 go into a band-shaped arrangement. As a result, the 01 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 are fed with a simple partial looping to the guide. tion jackets 14.1 and 14.2 of the godets 20.1 and 20.2 out. The filament bundle 5 wraps around the guide sheaths 14.1 and 14.2 alternately in an S-shaped yarn path. The guide sheaths 14.1 and 14.2 are arranged in such a way that in each case a wrap angle of> 180 ° adjusts to the guide sheaths 14.1 and 14.2 in the threadline.

In the yarn path, the first godet group 13.1 is followed by a second godet group 13.2 with a plurality of driven godets 20.3 and 20.4 for stretching the filament bundles 5, a draw zone being spanned between the godet groups 13.1 and 13.2. 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 mantle 15.1 is designed left-handed and drives the guide casing 15.1 in the counterclockwise direction. 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 shown in dashed lines in FIG. 1 and identified 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 end in the thread 22 through the formation of 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- said 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 deflection rollers in order to deflect the thread running from the guide roll 20.2 out of 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.

For the production of an FDY yarn, in the embodiment shown in FIG. 1, a polymer melt, for example of a polyester or a polyamide, is fed 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 that solidification and preorientation occurs on the filaments. After the filaments 4 have cooled, they are combined to form a bundle of filaments 5, with a preparation oil having a maximum water content of 8% being supplied, so that the filaments 4 of the filament bundle 5 are held together. In order to pull off a multifilament yarn from a spinning device and to draw it by means of hot drawing into a FDY yarn, the fiber bundle 5 is first removed from the guide casing 14.1 of the godet 13.1 and in an S-shaped yarn course around the guide casing 14.1 and the adjacent yarn Guiding 14.2 out. 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 Umschlingungs- direction 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 exemplary embodiment, the guide sheaths 14.1 and 14.2 are designed with an equal outer diameter, the arrangement of the godet groups 13.1 and 13.2 being selected such that the wrap angle of the filament bundle 5 on the guide sheaths 14.1 and 14.2 is in each case 180 ° exceeds. 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 transition 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 ⁰ C to 200 ⁰ C. Thus, the glass transition temperature is, for example, a polyester is in the range of 80 ⁰ C.

However, it is also possible to set the surface temperatures on the guide sheaths 14.1 and 14.2 differently. This is particularly necessary in cases where the simple looping of the filament bundle dels 5 to 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 passed after the expiry 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 the guide sheaths 15.1 and 15.2 of the second godet dome in an S-shaped loop, 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 °. To initiate a thermal after-treatment of the drawn yarn directly applicable in the second Galettengruppe 13.2, the guide sheaths are 15.1 and 15.2 to a surface temperature in the range of 80 to 200 ⁰ C ER- hitzt. In this exemplary embodiment, the surface temperatures are set at the same level. 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 for triggering yarn-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 sheaths 14.1 and 14.2, so that shorter residence times on the surfaces of the guide sheaths are achieved. Thus, the godet duo 13.1 is preferably driven at a guide speed in the range of 1,200 m / min, up to 3,500 m / min. 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 diameters or alternatively 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, for example, within the godet box 21 laterally next to the godet group 13.2 a radiant heater 32 is 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 erfmdungsgemäße method and the inventive device are characterized in particular by a low energy consumption in order to carry out a stränge c 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 of 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 feed

3 spinneret

4 filaments

5 filament bundles

6 cooling device

7 blowing device

8 cooling shaft

9 collection thread guides

10 chute

11 inlet yarn guide

12 thread brake

13.1, 13.2 godet group; godet duo

14.1, 14.2 guide sheath

15.1, 15.2 guide sheath

16 preparation device

16.1, 16.2 Preparation station

17 dosing pump

18 heating means

19 dosing line

20.1- 20.6 Galette

21 galette box

22 threads

23 winding device

24 head thread guides

25 traversing device

26 pressure roller

27.1, 27.2 winding spindle 28 coil

29 spindle carrier

30 machine frame

31 winding tube

5 32 radiant heater

33 swirling device

Claims

claims

1. A method of melt-spinning, drawing and winding a multifilament yarn into an FDY yarn in the following steps:

1.1. Extruding a plurality of filaments from a thermoplastic melt;

1.2. Cooling the filaments through a flow of cooling air to a temperature below the glass transition temperature of the thermoplastic material;

1.3. Combine the filaments into a filament bundle underneath

Feeding a preparation oil with a maximum water content of 8%;

1.4. Withdrawing the filament bundle at a withdrawal speed of above 1200 m / min with or without supplying a heat energy for heating the filament bundle by a simple partial wrapping of the filament bundle on at least one optionally heated guide shell of a driven godet;

1.5. Stretching the filament bundle in a drawing step with a stretching speed above 3500 m / min by a simple

Partial entanglement of the filament bundle on guide shells of several driven godets with the supply of heat energy for relaxing the filament bundle through the heated guide shells of the godets;

1.6. Winding the thread into a spool.

2. The method according to claim 1,

characterized in that

the filament bundle is guided on the guide shells of the godets, each with a wrap angle greater than 180 °.

3. The method according to claim 1 or 2,

characterized in that

the preparation oil is heated before application to the filament bundle.

4. The method according to any one of claims 1 to 3,

characterized in that

the filament bundle is passed after wetting with the preparation oil for equalization of the oil application by a yarn brake.

5. The method according to any one of claims 1 to 4,

characterized in that

for stripping with or without heating the filament bundle before stretching the thread with contact in an S-shaped or Z-shaped Teilumschlingung on two optionally heated guide coats of a first Galettenduos is performed.

6. The method according to any one of claims 1 to 5,

characterized in that

for stretching and relaxing the filament bundle, the thread is guided with contact in an S-shaped or Z-shaped partial loop on two heated guide shells of a second godet duo.

7. The method according to any one of claims 1 to 6,

characterized in that

the filament bundle is additionally heated without contact by heat radiation of a radiant heater.

8. The method according to any one of claims 1 to 7, characterized in that

the filament bundle is vortexed before winding in a stretched between two driven godets piece of thread and that the cohesion of the filaments is produced in a thread by at least 10 interlacing knots per meter of thread length.

9. Apparatus for carrying out the method according to one of claims 1 to 8, with a spinneret (3) for extruding a plurality of filaments (4), with a cooling device (6) for cooling the filaments (4), with a preparation device (16 ) for applying a finishing oil to the filaments (4), comprising a collecting thread guide (9) for combining the filaments (4) into a filament bundle (5), with a plurality of driven godets (20.1-20.4) with partially heated guide sheaths (14.1, 14.2, 15.1, 15.2) for pulling off, heating and stretching the filament bundle (5) and with a take-up device (23),

characterized in that

the guide sheaths (14.1, 14.2) of the driven godets (20.1, 20.2) for pulling off and / or heating the filament bundle form a first godet group (13.1) whose guide sheaths (14.1,

14.2) are arranged to a yarn path with simple Teilumschlingung and optionally heated, and that the guide sheaths (15.1, 15.2) of the driven godets (20.3, 20.4) for stretching and relaxing a second godet group (13.2) form, the guide sheaths (15 ., 15.2) are heated and are arranged to a yarn path with simple Teilumschlingung, wherein between the two godet groups (13.1, 13.2) is formed a draw zone.

10. Apparatus according to claim 9,

characterized in that the guide sheaths (14.1, 14.2, 15.1, 15.2) of the godets (20.1-20.4) are arranged to form a threadline, each with a simple partial looping at an angle of wrap greater than 180 °, with adjacent godets (20.1, 20.2) preferably being cast in opposite directions (FIG. 14.1, 14.2).

11. Apparatus according to claim 9 or 10,

characterized in that

the preparation device (16) has a heating means (18) through which the preparation oil can be heated prior to wetting the filaments (4).

12. Device according to claim 9 or 10,

characterized in that

the godets (20.1, 20.2) of the first godet group (13.1) in the yarn path a yarn brake (12) is arranged upstream.

13. Device according to one of claims 9 to 12,

characterized in that

the first godet group is formed by a first pair of godets (13.1) with optionally heated guide sheaths (14.1, 14.2) and that the second godet group is formed by a second pair of godets (13.2) with two heated guide sheaths (15.1, 15.2), the filament bundle (5 ) in the S-shaped or Z-shaped threadline on the guide sheaths (14.1, 14.2, 15.1, 15.2) of the godet duo (13.1,

13.2) is feasible.

14. Device according to one of claims 9 to 13,

characterized in that at least one radiation heater (32) is provided, which is arranged between the godets (20.3, 20.4) or associated with one of the godets (20.4).

15. Device according to one of claims 9 to 14,

characterized in that

the second godet group (13.2) downstream of a swirling device (33) in the yarn path, which is held between two driven godets (20.5, 20.6).

16. Device according to one of claims 9 to 15,

characterized in that

the preparation device has two separate preparation stations (16.1, 16.2) for preparing the filament bundle, a first preparation station (16.1) being associated with the collecting thread guide (9) and a second preparation station (16.2) between the second godet group (13.2) and the winding device (23 ) is arranged.