WO2017063913A1 - Method and device for producing fine multifilament threads - Google Patents

Abstract

The invention relates to a method and a device for producing fine multifilament threads from a polymer melt. A plurality of filaments are extruded, cooled, and combined in bundles so as to form a respective thread. The threads are drawn by multiple godets and wound into multiple coils. The aim of the invention is to guide the threads in a stable manner even with very fine thread titers. According to the invention, this is achieved in that the threads are combined into multiple thread bundles before being drawn. The thread bundles are guided and drawn parallel to one another on the godets and separated again into individual threads after being drawn. For this purpose, a thread bundle guide is provided on an outlet side of a drawing device.

Description

 Method and device for producing fine multifilament threads

The invention relates to a method for producing fine multifilament threads from a polymer melt according to the preamble of claim 1 and to an apparatus for carrying out the method according to the preamble of claim 8.

For the production of fine, soft textiles such as neckerchiefs fine synthetic threads are required, which are produced in a melt spinning process as fully drawn threads (FDY) Due to the fineness of the threads particular attention must be paid to the tempering and guidance on the godets for drawing the threads become. In addition, it must be ensured that the threads have a stable threadline until the end of the process. In order to be able to carry out the production of the threads in a particularly energy-efficient manner, methods and devices have proven successful in which the threads are guided on the godet surfaces with simple wraps

Thus, for example, a generic method and a generic device from WO 2012/013367 AI apparent. In the known method and in the known device, the multifilament yarns spun in a spinning station are guided for stretching over a plurality of godets, which are arranged within a godet box. It has now been found that, with very fine threads, the drag air flows generated by the godet coats cause undesirable vibrations on the threads, which in particular disturb the smooth running of the threads. In order to produce the highest possible number of threads within the spinning station, however, relatively short thread spacings between the adjacent threads are to be observed. So it is common in today's processes, to lead up to 24 threads at the same time on the circumference of the godet coats. This even entails the risk of individual thread collisions.

It is therefore an object of the invention to provide a generic method and a generic device for producing fine multifilament threads from a polymer melt, in which a high uniformity in the process control of the threads and a high uniformity in the formation of the physical properties of the threads is achieved ,

This object is achieved by a method with the features of claim 1 and by a device 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 has the particular advantage that in the areas of the rapid spinning process, in which the environmental influences are particularly problematic for fine threads, several threads are guided as a bundle of filaments Such formed from several individual filaments bundle of filaments are more resistant to environmental influences, such as those generated by godets slow air currents. For this purpose, the threads are combined prior to stretching into several bundles of filaments, so that the bundles of filaments run parallel to one another on the godets. are bar. After hiding the thread bundles can be resolved to the individual threads to wind the threads individually to coils can.

For this purpose, the device according to the invention has a bundle thread guide in a region between the drawing device and the treatment devices, in order, on the one hand, to allow parallel guidance of the bundles of filaments on the godets and, on the other hand, a dissolution of the bundles of filaments. For the stability of the process has been shown that the bundles of fibers should be performed with a Mindestionsumschlingung on the circumference of the godets. Thus, the partial looping of the thread bundles on the circumference of the godets usually lies in an angular range of 100 ° to 350 °. Depending on the fineness of the threads, the thread bundles are formed from two to eight adjacent guided threads. This can be realized on the thread bundle a total titer, which is preferably above 20 den.

The fineness of the threads is determined both by the number of filaments and by the filament titer. The inventive method is carried out in particular in the variant in which the number of filaments within one of the filament bundles on the thread produce a total titer in the range of 4 to 30 den. Since the threads are preferably drawn in a dry state or in a slightly wetted state, the method variant is particularly advantageous in which the threads are wetted and swirled individually after dissolving the bundle of filaments. This results in a high thread end produced between the filaments of the threads, so that the threads receive sufficient stability for direct further processing.

For winding the threads, winding devices have proven in which the threads are fed to the winding points laterally to obtain the lowest possible installation height within the process sequence. In this case, pulleys are required to allow the inlet of the threads in the winding points. Due to the fineness, the method variant has proved successful, in which the threads are guided in pairs over one of a plurality of deflection rollers for distribution to a plurality of winding locations. Thus, the resistances to the threads caused by the drive of the rollers can be in relation to the winding thread tensions within the individual winding positions In order for the dissolution of the threads in particular to be unproblematic, the method variant is preferably carried out, in which the threads are applied individually to the godets and downstream treatment devices at the start of the process and in which the threads are folded up manually or automatically into thread bundles after application For example, the filaments in a thread section can be guided together as a bundle of filaments without obtaining greater mixing of the filaments.

In order to obtain an automated merging of individual threads, the device according to the invention has at least one movable thread guide means, which is arranged upstream of the stretching device and through which a plurality of threads can be folded into a thread bundle. To distribute the threads on the winding set the winding device, the device variant is preferably used, in which the winding points of the take-up are assigned a plurality of pulleys, wherein the number of pulleys is equal to half the number of winding positions. This ensures that the threads are pairwise feasible over one of the pulleys and thus can generate a higher drive energy for driving the pulleys.

The method according to the invention and the device according to the invention are suitable for producing fine multifilament threads from the polymers customary for textile use. Thus, the threads can be made from a polyamide melt or a polyester melt.

The inventive method for producing fine multifilament threads will now be described below with reference to an embodiment of the device according to the invention with reference to the accompanying figures.

Fig. 1 shows schematically a side view of an embodiment of the device according to the invention

 FIG. 2 schematically shows a front view of the embodiment of FIG. 1. FIG

 Fig. 3 shows schematically the side view of the embodiment of Fig. 1 when applying the threads

Fig. 4 shows the front view of the embodiment of Fig. 1 when applying the threads The following description applies to all figures, insofar as no explicit reference is made to one of the figures.

The exemplary embodiment of the device according to the invention for carrying out the method according to the invention for producing fine multifilament threads from a polymer melt comprises a spinning device 1, a cooling device 3, a drawing device 10, a plurality of treatment devices 16 and 20 and a winding device 21. The devices 1, 3, 10 and 21 are arranged substantially vertically below one another to carry out the process in order to produce a plurality of fine multifilament threads.

The spinning device 1 has a spinning beam 8, which carries a plurality of spinnerets 2 on its underside. In this embodiment, four spinning nozzles 2 are held on the spinning beam 8, each of which generates a plurality of filaments. Each of the spinneret 2 held on the spinning beam 8 is in each case coupled via separate melt lines to a multiple pump (not illustrated here). Such multiple pumps are preferably designed as so-called planetary gear pumps. The feed of a polymer melt takes place here through a melt inlet 4, which is connected to the multiple pump.

Below the spinning device 1, the cooling device 3 is provided. In this exemplary embodiment, the cooling device 1 has a blowing chamber 31 which cooperates with a cooling shaft 9 through which the extruded filaments are guided The illustration of the blow chamber 31 and the cooling shaft 9 is exemplary and las st as a function of the cooling process arbitrarily designed. For example, it is known to form the cooling shaft by a plurality of cooling cylinders, which are arranged concentrically to the spinnerets and are held within the blast chamber. Thus, the cooling air can be directed radially from the inside to the outside on the filaments. It is also possible to form the blow chamber on one side to the cooling shaft with a blowing wall, which generates a transverse cooling air flow. In that regard, the invention is not limited to a particular manner of cooling the filaments.

Since each of the multifilament yarns 7 is formed by a multiplicity of filaments, at the outlet of the cooling device 3, the filaments are brought together to form a filament bundle which forms the yarn 7 in each case. For this purpose, several collection adenführer 5 are provided. The collecting yarn guides 5 are respectively held centrally to the upstream spinning nozzles 2 and form a point of convergence of the extruded filaments, which are bundled in the point of convergence to the yarn 7. Below the cooling device 3, the stretching device 10 is arranged. In the transition region between the cooling device 3 and the drafting device 10, the threads are brought together by a so-called spinning division to pass through the subsequent treatment stages as a group of threads with a smaller thread spacing. For this purpose, the drafting device 10 is preceded by a combed yarn guide 6. The combed yarn guide 6 has a plurality of guide elements in order to be able to guide the individual threads 7 separately. In the embodiment shown, the drawing device 10 is preceded by an additional movable thread guiding means 17. The yarn guide smittel 17 serves to bundle the threads 7 to a plurality of bundles of fibers 14. For this purpose, the thread guide means 17 can move into the yarn path of the threads 7. The function and structure of the thread guide means will be explained in more detail below.

The drafting device 10 has in this embodiment, several godets 11.1 to 11.4. In this exemplary embodiment, the stretching device 10 consists of a total of four godets 11.1 to 11.4, each of which has a heated godet casing 12.1 to 12.4. The godets 12.1 to 12.4 of the godets 11.1 to 11.4 are driven by godet motors 13.1 to 13.4 such that a parallel thread guide with a partial looping in the range of 100 ° to 350 ° to the godet sheaths 12.1 to 12.4 is possible.

The structure of the drafting device 10 is exemplary and could be supplemented by additional driven pulleys or other driven godets. The godets 11.1 to 11.4 are arranged within a godet box 32.

On the outlet side of the drawing device 10, a bundle thread guide 15 is arranged, which guides the bundles of threads 14 emerging from the godet box 32.

Below the bundle thread guide 15, a plurality of treatment devices in the form of a wetting device 16 and a swirling device 20 are connected. The wetting device 16 has an inlet thread guide 29, through which the threads 7 are guided after dissolution of the filament bundle 14

Beneath the wetting device 16, two guide godets 22.1 and 22.2 are arranged. Between the driven guide godets 22.1 and 22.2 is in the tensioned thread piece, the swirling device

20 arranged to swirl the threads 7 after wetting. In this case, a thread closure is produced on each thread 7 by formation of intertwining nodes. A thread tension in the threads 7 required for the swirling is advantageously set by a differential speed set between the guide godets 22.1 and 22.2.

Below the guide godets 22.1 and 22.2 is the take-up device

21 arranged. The winding device 21 is formed in this embodiment example by a so-called bobbin revolving machine, which has a rotatable spindle carrier 33 with two freely projecting winding spindles 26.1 and 26.2. The spindle carrier 33 is rotatably mounted in a machine frame. In this case, the winding spindles 26.1 and 26.2 can be guided alternately into an operating region for winding a coil and into a changing region for exchanging the coil.

In the machine frame of the winding device 21 a plurality of winding points 25.1 to 25.4 are formed. In each of the winding points 25.1 and 25.4, a thread 7 is wound into a coil 30. The coils 30 are alternately held and wound on the winding spindles 26.1 and 26.2. Each of the winding points 25.1 and 25.4 has to guide the yarn 7 a head yarn guide 24 and a traversing unit 28 on. To deposit the threads on the coil surfaces of the coils 30 is the winding points 25.1 to 25.4 associated with a pressure roller 27, which is in contact with the surface of the coils 30.

For distributing the threads on the winding points, a plurality of deflection rollers are arranged between the guide roller 22. 2 and the head thread guides 24. In this embodiment, two pulleys 23.1 and

Provided 23.2 to supply the threads 7 in pairs the winding stations 25.1 and 25.4. The pulleys 23.1 and 23.2 are freely rotatably mounted.

The illustrated embodiment of the take-up device is exemplary in this case. Basically, the number of winding positions depends on the number of threads produced in the spinning station So can be wound simultaneously on a cantilever winding spindle 10, 12 or 16 coils In this case, preferably five, six or eight pulleys are used to pairs the threads 7 to lead to the distribution on the winding stations.

To produce an FDY yarn, a polymer melt, for example made of a polyester or a polyamide, is fed to the spinning beam 8 in the illustrated embodiment. Within the spinnerets 2, the polymer melt is forced under pressure through the nozzle bores formed at the bottom of the spinneret 2 to extrude a plurality of filaments. Within the cooling chute 9, 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 the filaments are combined into a filament bundle, each of the filament bundles forming one of the filaments 7.

As can be seen from FIGS. 1 and 2, the threads 7 are each brought together to form a plurality of bundles of fibers 14 prior to drawing. In this embodiment, two adjacent threads 7 are combined to form a bundle of fibers 14. The yarn bundle 14 is guided by the comb yarn guide 6. Depending on the yarn denier, two to eight yarns 7 can thus be brought together to form a fiber bundle 14. The number of filaments are selected as a function of the filament denier such that the filaments 7 each have a filament titer in the range of 4 to 30 den. Here, the number of filaments per thread 7 may be in the range between 10 and 80 individual filaments.

For stretching the thread bundle 14, these are guided in an S-shaped threadline with simple Teilumschlingung on the circumference of the godet coats 12.1 to 12.4. The filament bundles 14 can thus be guided alternately with an inner side and an outer side on the surfaces of the godet sheaths 12.1 to 12.4. In order for a pervasive heating of all filaments within the thread bundle 14 is ensured.

In order to obtain a sufficient stretching of the thread bundles, the first godet of the drafting device 11.1 is preferably at a guide speed in the range of 1200 m / min. up to 3,500 m / min. driven. After stretching, the guide speed for the last galette 11.4 is in the range of 3,500 to 6,000 m / min. Through the Increased overall titre of the bundle of threads is possible in this case a stable thread guide despite generated Schlepfluftströmungen.

After stretching, the filament bundles 14 are dissolved into the individual filaments 7. For this purpose, the bundle thread guide 15 is provided on the outlet side of the stretching device, the device 16 for the dissolution of the filament bundle 14 with the inlet guide 29 of the wetting cooperates. The subsequent treatments in the treatment devices 16 and 20 are performed occasionally on the threads 7. Thus, each of the threads 7 is wetted with a spin finish and subsequently swirled in the swirling direction 20. Thus, a minimum number of about 10 knots per running meter of thread length can be created on the threads to set a thread closure.

The threads are then guided to the winding points 25.1 to 25.4 in order to be wound into coils 30. The distribution takes place in pairs, in which two adjacent threads 7 are guided on the circumference of one of the deflection rollers 23.1 and 23.2. This enables the relatively low winding-up stresses adjust at each of the threads, without the bridged to bearing friction of the pulleys 23.1 and 23.2 acts negatively. In order to allow the bundling of the threads 7 and the dissolution of the bundles of threads 14, the threads 7 are initially inserted parallel to each other in the facilities in front of and behind the drawing device 10 at the start of the process. The application of the threads 7 at a process start is shown in Fig. 3 and 4 schematically illustrated. Thus, the threads are recorded after piecing in the spinning device 1 by a manually guided suction gun 34. The manually guided suction gun 34 is used to sequentially apply the group of yarns of the threads 7 into the intended yarn guides 5 and 6. The threads are then guided in parallel over the godet sheaths of the godets 11.1 to 11.4 and in the treatment devices 16 and 20. The enema yarn guide 29 provided in the wetting direction 16 is preferably designed to be movable in order to prevent wetting of the yarn during application.

For bundling the threads 7 the yarn guide means 17 is associated with the yarn guide 6. The thread guiding means 17 has a displaceable leading edge 18, which can be guided via a linear drive 19 in the yarn path of the threads 7. The leading edge 18 is designed such that the threads guided in the interior are guided to the outside and combine with the adjacent threads 7 to form a bundle of fibers 14. The extended position of the thread guide means 17 is shown in Fig. 3. After bundling the threads 7, the thread guiding means 17 returns to its rest position, so that the bundles of fibers 14 run into the combing yarn guide 6 and enter the drawing device 10 parallel to one another. By the bundle thread guide 15 on the outlet side of the drawing device 10, a parallel guidance of the thread bundle 14 is ensured. The application of the threads in the bundle thread guide 15 is preferably carried out manually.

The inventive method and apparatus according to the invention are thus particularly suitable for the finest threads with the conventional To be able to produce production speeds. In this case, both threads of polyester or polyamide can be produced

Claims

claims 1. A process for producing fine multifilament yarns from a polymer melt, in which a plurality of filaments are extruded, cooled and bundled together in each case to one of the threads, in which the threads are drawn through several godets and in which the threads after Verstrrecken are individually wound into a plurality of bobbins, characterized in that the threads are merged before VerStrecken to several bundles of fibers, that the bundles of fibers are guided parallel to each other on the godets and ver stretched and that the bundles of fibers after the United stretch to the individual threads dissolved become. 2. The method according to claim 1, characterized in that the filament bundles are each performed with a Teilumschlingung in an angular range of 100 ⁰ to 350 ° on the circumference of the godets. 3. The method according to claim 1 or 2, characterized in that the filament bundles are formed from two to eight adjacent guided threads. 4. The method according to any one of claims 1 to 3, characterized in that the number of filaments within one of the filament bundles on one of the threads produce a total titre in the range 4 to 30 den. 5. The method according to any one of claims 1 to 4, characterized in that the threads are individually wetted and swirled after the dissolution of the filament bundles. 6. The method according to any one of claims 1 to 5, characterized in that the threads for distributing to a plurality of winding points are guided in pairs over one of a plurality of deflection rollers. 7. The method according to any one of claims 1 to 6, characterized in that the threads are created at the beginning of the process individually to the godets and the downstream treatment facilities and that the threads are folded manually or automatically after the application to the thread bundles. 8. Apparatus for carrying out the method according to one of claims 1 to 7 with a spinning device (1) having a plurality of spinnerets (2), with a cooling device (3), with several Sammelf adenführern (5), with a drawing device (10) with several Godets (11.1-11.4), with a plurality of treatment devices (16, 20) and with a winding device (21) with a plurality of winding points (25.1-25.4), characterized in that a bundle thread guide (15) in a region between the drawing device (10) and the treatment means (16, 20) is arranged, through which a bundle of threads (14) can be guided immediately before a division into a plurality of threads (7). 9. Apparatus according to claim 8, characterized in that the treatment devices by means of a preparation device (16) for Wetted of the threads and a swirling device (20) is formed. 10. The device according to claim 8 or 9, characterized in that the drawing device (10) at least one movable thread guiding means (17) is arranged upstream, by which a plurality of threads to a bundle of threads (14) are collapsible. 11. Device according to one of claims 8 to 10, characterized in that a plurality of winding points (25.1 - 25.4) of the take-up device (21) a plurality of deflection rollers (23.1, 23.2) are assigned, wherein the number of pulleys (23.1, 23.2) equal to half Number of winding positions (25.1 - 25.4) is.