EP2567008B1 - Process and apparatus for melt-spinning, drawing and winding multiple synthetic threads - Google Patents

Description

The invention relates to a method for melt-spinning, drawing and winding a plurality of synthetic threads according to the preamble of claim 1 and a device for carrying out the method according to the preamble of claim 7.

In the production of synthetic threads in a melt spinning process, it is common that in a spinning position several threads are extruded, cooled, stretched and wound into coils in parallel side by side. The filaments are fed after extrusion as a group of threads and collectively stretched by godets and wound by means of a winding device with multiple winding points collectively to form coils. So that the majority of the threads can be pulled off at the same time by a godet from the spinnerets, it is also common practice to merge the threads in a first transition distance to a smaller thread distance to each other. During extrusion and cooling, the spinnerets are held with a spinning distance to each other, so that the threads are guided within a vertical spinning distance with the spinning distance to each other. For the collective guidance of the threads on the godets a smaller distance is required, so that the transition distance between the spinning device and the drawing device is used to merge the threads. For this purpose, it is necessary, in particular to deflect the threads in the outer regions of the yarn sheet. In addition, this results in different take-off ratios of the filaments when extruding the filament strands on the spinnerets.

Such a method and such a device are for example from EP 0 845 550 A1 known. In order to compensate for the differences in tension caused by different deflections of the threads prior to winding of the threads are in the known Method and the known device, the threads after stretching and before winding led by individually driven delivery mechanisms. Although this makes it possible to even out the thread tension differences in the threads of the group of threads caused by multiple deflection. However, the different thread guides that already occur before and during stretching remain unconsidered and have a different effect immediately upon stretching of the threads on the individual side-by-side threads.

Such disadvantages in the production of several synthetic threads in parallel side by side can be completely avoided only by each individual thread separately and independently withdrawn, stretched and wound into coils. Such a method and such a device are for example from DE 102 36 826 A1 known. In the known method and the known device separate drawing units are provided per thread, which cooperate with a winding device. Thus, substantially straight threadlines between the spinning device and the drawing device can be realized. However, such methods and apparatus take up more space since all the means for stripping, drawing, treating and winding the threads must be in multiple execution. In that regard, these process variants and devices are preferably used for the production of composite yarns, in which each of the partial yarns produced has the same properties as possible.

New developments, such as from the DE 10 2009 021 131 A1 are known, are based on an arrangement in which the stretching device are arranged laterally next to the spinning device, wherein between the spinneret and the drawing device per thread deflection rollers are arranged. Thus, although larger deflections in the transition region between the drawing device and the spinning device can be avoided. The free thread line between the stretching device and the spinnerets, however, are formed differently long for each thread. In that regard, differences are to be expected also in this process.

It is an object of the invention to provide a method for melt-spinning, drawing and winding a plurality of synthetic threads and a device for carrying out the method of the generic type, in which the threads are produced with the highest possible uniformity even with collective stretching.

This object is achieved by a method such that the threads are withdrawn independently of each other by separate Einzelgaletten after extrusion and before the collective drawing.

In the apparatus, the object can be achieved in that a plurality of juxtaposed individual godets of the stretching device are arranged upstream, wherein the individual godets are each assigned to one of the threads and are individually driven to deduct the respective thread.

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, in particular during extrusion, cooling and stretching, the processes which are decisive for determining the physical properties of the filaments are due to the solidification of the amorphous molecular structure and the crystallization. The molecular structure which forms on the threads during stripping thus forms the essential basis in order to achieve the desired effects with the further treatments. According to the invention, a single godet is thus assigned to each thread, which determines the respective withdrawal of the thread from the spinneret. Thus, regardless of the number of threads produced per spinning position, each of the threads with substantially identical properties are subtracted and fed to the subsequent collective stretching.

For this purpose, the method variant is preferably used, in which the threads are withdrawn in a straight line run at the same withdrawal speeds on the individual godets. In addition, high and uniform throughput rates can be achieved at the spinnerets.

To produce threads with larger thread tiers, the method variant has proven particularly useful, in which the threads are guided at the periphery of the single godet each with a Mehrfachumschlingung. This makes it possible to realize higher pull-off forces on each of the individual threads.

In order for the subsequent treatments of the yarn to be carried out jointly for all yarns, it is further provided that the yarns are combined after being pulled off to form the yarn sheet and that the yarn sheet is drawn by guiding it on a plurality of draw godets arranged one behind the other. Thus, a collective stretching of the threads is possible.

In order to comply with the smallest possible thread intervals between the individual threads of the group of threads, a secure guidance of the threads is required. This is achieved in particular by the variant of the method in which the first draw godet is driven at a circumferential speed which is equal to or greater than the draw speed of the single godet. Preferably, a slight stretch between the withdrawal godets and the draw godet is set. Depending on the thread type and process, the threads can be tempered directly to the individual godets.

The inventive method and the device according to the invention are particularly suitable for such threads, which after the melt spinning process be fed directly to a final processing. Thus, the process variant in which the threads are crimped parallel to each other after drawing and before winding, preferably used. Such crimped threads can be used advantageously as carpet yarns.

In order to realize a straight thread run when removing the threads, the device according to the invention is preferably designed such that the individual godets are each assigned to the spinnerets at a distance in the middle. Thus, each thread and in particular the filament strands forming the thread can be removed from the spinneret with a high degree of uniformity.

To generate higher withdrawal forces, the development of the device according to the invention is provided, in which the individual godets for guiding the respective threads a plurality of rotatably mounted overflow rollers are assigned. Thus, each of the threads can be led with multiple wrapping on the single godet.

Depending on the method and thread type, a first temperature control of the thread is already possible in that the individual godets each have a heatable godet jacket. Thus, in particular in the case of multiple wrapping, preliminary heating preparatory to stretching can be introduced into the thread.

On the one hand, to obtain low heights of the overall apparatus and, on the other hand, small deflections, according to a particularly advantageous development of the apparatus according to the invention, a first draw godet of the drafting means is arranged laterally next to the individual godets held in a row, wherein the draw godet on a feed side is assigned a multiple yarn guide. Thus, the threads can be fed together as a group of threads with a narrow treatment distance side by side of the draw godet.

The device according to the invention is used in particular in the embodiment in which a crimping device is arranged between the stretching device and the winding device, which has a plurality of texturing means for collectively crimping the threads. This makes it advantageous to produce carpet yarns that can be presented directly to a further processing process.

The method according to the invention and the device according to the invention are explained in more detail below on the basis of some embodiments according to the attached figures.

Fig. 1

schematisch eine Vorderansicht eines ersten Ausführungsbeispiels der erfindungsgemäßen Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens

Fig. 2

schematisch eine Seitenansicht des Ausführungsbeispiels aus Fig. 1

Fig. 3

schematisch eine Draufsicht eines weiteren Ausführungsbeispiels der erfindungsgemäßen Vorrichtung

Fig. 4

schematisch eine Seitenansicht des Ausführungsbeispiels aus Fig. 3

They show:

Fig. 1

schematically a front view of a first embodiment of the device according to the invention for carrying out the method according to the invention

Fig. 2

schematically a side view of the embodiment of Fig. 1

Fig. 3

schematically a plan view of another embodiment of the device according to the invention

Fig. 4

schematically a side view of the embodiment of Fig. 3

In the Fig. 1 and 2 a first embodiment of the device according to the invention for carrying out the method according to the invention is shown schematically in several views. Fig. 1 represents the embodiment in a front view and Fig. 2 schematically in a side view. As far as no explicit reference is made to one of the figures, the following description applies to both figures.

The embodiment according to Fig. 1 and 2 has a spinning device 1 with a total of three juxtaposed spinnerets 4.1,4.2 and 4.3. The number of spinnerets in the spinning device 1 is exemplary and can also significantly more than three threads per spinning position include. The spinnerets 4.1, 4.2 and 4.3 are held on the underside of a heated spinneret 3. The spinning beam 3 contains other melt-carrying parts, not shown here, in order to supply the melt supplied via an inlet 2 thermoplastic melt a melt source the spinnerets 4.1 to 4.3. In that regard, at least one or more spinning pumps and distribution lines is arranged in the spinning beam 3. The spinnerets 4.1 to 4.3 have on their undersides a plurality of nozzle openings, from each of which a plurality of strand-shaped filaments are extruded.

Below the spinning beam 3, a cooling device 6 is arranged, which extends with a cooling shaft 7 immediately below the spinneret 4.1 to 4.3. The cooling device 6 is designed in this embodiment as a cross-flow blowing, in which a cooling air flow generated by means of a laterally arranged blow chamber 8 and directed to the filament strands of the threads 5.1, 5.2 and 5.3.

In order to combine the multiplicity of filament strands produced per spinneret 4.1 to 4.3 into one thread in each case, a collection thread guide 9.1, 9.2 and 9.3 as well as a preparation device 10.1, 10.2 and 10.3 are arranged at a distance below the spinnerets 4.1, 4.2 and 4.3. The collecting thread guide 9.1, 9.2 and 9.3 are each held centrally to the spinnerets 4.1, 4.2 and 4.3. Thus, the group thread guide 9.1 is held centrally to the spinneret 4.1.

It should be expressly mentioned at this point that the preparation devices 10.1, 10.2 and 10.3 as well as the collection thread guides 9.1, 9.2 and 9.3 can also advantageously be combined with each other so that the filament strands are brought together and the filament strands are prepared for example by a pencil oiler.

In the further course of the thread, the spinnerets 4.1, 4.2 and 4.3 are assigned a plurality of individual godets 11.1, 11.2 and 11.3, which in this exemplary embodiment each combine with an overflow roller 12.1, 12.2 and 12.3 are. The individual godets 11.1, 11.2 and 11.3 are held at a distance substantially centrally to the respective upstream spinnerets 4.1, 4.2 and 4.3. Thus, the threads 5.1, 5.2 and 5.3 can each be deducted vertically in the straight yarn path of the spinnerets 4.1, 4.2 and 4.3 through the individual godets 11.1, 11.2 and 11.3. Thus, the individual godet 11.1 is associated with the spinneret 4.1, which extrudes the filament strands to the yarn 5.1.

Like from the Fig. 2 As can be seen, the individual godets 11.1 to 11.3 and the overflow rollers 12.1 to 12.3 are held cantilevered on a machine frame 25, wherein each individual godet 11.1 to 11.3 is associated with a drive 23. By the drives 23 (in Fig. 2 if only one of the drives is shown), the individual godets 11.1, 11.2 and 11.3 are driven independently of each other. The drives 23 can be controlled by individual control units or by a common control unit.

As from the illustration in Fig. 1 shows, the individual godets 11.1 to 11.3 are arranged in a row next to each other. In the further course of the threads, a first draw godet 14.1 of a drawing device 13 is arranged laterally next to the single godet 11.3. Between the draw godet 14.1 and the single godet 11.3 a multiple yarn guide 15 is arranged, which merges the running of the individual godets 11.1 to 11.3 threads 5.1 to 5.3 to a yarn sheet 29. Within the yarn sheet 29, the threads 5.1 to 5.3 have a substantially short treatment distance from each other.

The drawing device 13 has a plurality of draw godets 14.1 to 14.4 for collective drawing of the yarns 5.1 to 5.3, with two draw godets 14.1 and 14.2 as well as 14.3 and 14.4 forming a godet pair on which the yarns are passed in multiple wrapping. The draw godets 14.3 and 14.4 are driven with respect to the draw godets 14.1 and 14.2 at a higher peripheral speed, so that the threads between the draw godets 14.2 and 14.3 are stretched.

For this purpose, each of the draw godets 14.1 to 14.4 is assigned a separate drive. In Fig. 2 only the drives 24.1 and 24.2 of the first two draw godets 14.1 and 14.2 are shown. The draw godets 14.1 to 14.4 are in this case preferably designed with heated godet coats.

Below the drawing device 13, a winding device 17 is arranged, which has a plurality of winding points 18.1, 18.2 and 18.3. In each of the winding stations 18.1, 18.2 and 18.3, the yarns guided as yarns 5.1, 5.2 and 5.3 are wound parallel to each other to form coils 21.1, 21.2 and 21.3. The winding device 17 has for this purpose two winding spindles 19.1 and 19.2, on which alternately the coils 21.1, 21.2 and 21.3 are wound. The winding spindles 19.1 and 19.2 are arranged cantilevering on a winding turret 20, which alternately pivots the winding spindles for continuous winding of the threads between an operating region and a change region.

The supply of the yarn sheet 29 to the winding device 17 via a guide roller 16, which is downstream of the drawing device 13.

At the in Fig. 1 and 2 illustrated embodiment, the extruded through the spinnerets 4.1 to 4.3 threads 5.1 to 5.3 each individually and separately deducted by the driven single godets 11.1 to 11.3. In this case, the same take-off speeds can be set on each of the threads 5.1 to 5.3, so that each of the threads 5.1 to 5.3 are extruded, cooled and drawn off under the same conditions. Only then are the threads 5.1 to 5.3 merged into a yarn sheet 29 to be stretched together in the drawing device 13 and then wound together by the winding device 17 to form coils. In addition to the constant deduction conditions larger deflections and spreading of the yarn sheet are also avoided by the multiple deflection of the godets. In that regard, can also be advantageous a larger Produce a number of threads in collective treatment with substantially the same physical properties.

In that regard, the inventive method and device according to the invention is particularly advantageous to produce high quality threads in a melt spinning process, which can be used directly for further processing. So is in Fig. 3 and 4 a further preferred embodiment of the invention shown in which after the drawing of the threads, a crimping is produced on the threads. The embodiment according to Fig. 3 and 4 is substantially identical to the aforementioned embodiment, so that at this point only the differences will be explained and otherwise referred to the aforementioned description.

At the in Fig. 3 and 4 illustrated embodiment, a crimping device 26 is disposed between the drawing device 13 and the winding device 17. The crimping device 26 has a plurality of texturing means 27 in order to texture the drawn threads 5.1 to 5.3 parallel to each other as a group of threads. As texturing 27, for example, texturing can be used, which consist of a delivery nozzle and a stuffer box. In this case, each of the threads is 5.1 to 5.3 aufgestaucht to a yarn plug 30.1 to 30.3. Such crimping devices are generally known, so that no further explanation takes place at this point. The crimping device 26 comprises a cooling roller 28, on the circumference of three thread running tracks for receiving the yarn plugs 30.1 to 30.3 are formed. At the periphery of the cooling roller 28, the yarn plugs 30.1 to 30.3 are cooled. The cooling roller 28 is driven by a roller drive 33.

As from the illustration in Fig. 3 Further, the yarn plugs 30.1 to 30.2 are dissolved after the crimping to the threads 5.1 to 5.3 and withdrawn collectively from the chill roll 28 by a Abzugsgalette 31.1. The withdrawal godet 31.1, which is also combined with an overflow roll, is followed by another withdrawal godet 31.2, wherein between the withdrawal godets 31.1 and 31.2 a swirling device 32 is held. The withdrawal godets 31.1 and 31.2 are driven independently of each other, wherein in Fig. 4 only the drive 34 of the withdrawal godet 31.1 is shown. The turbulizer 32 has to treat the yarn sheet 29 three separate treatment channels, in which each of the threads 5.1, 5.2 and 5.3 are individually swirled. Thus, in addition to the crimping, an intensive thread closing is produced on the threads 5.1 to 5.3, which are then fed via the deflection roller 16 to the winding device 17. In the winding device 17, the crimped yarns 5.1 to 5.3 are wound parallel to each other to form coils, as already shown in the example Fig. 2 shown.

The method according to the invention and the device according to the invention are thus particularly advantageous in order to enable an individual withdrawal of the threads with subsequent collective treatment and joint use of the following devices. The in the Fig. 1 to 4 show only exemplary some embodiments of the invention. In principle, the threads drawn from the individual godets can also be formed from a plurality of filament bundles. It is essential here that the yarn guided and treated in the yarn sheet is previously removed individually during extrusion and cooling.

LIST OF REFERENCE NUMBERS

1

spinner

2

Intake

3

spinning beam

4.1, 4.2, 4.3

spinneret

5.1, 5.2, 5.3

thread

6

cooling device

7

cooling shaft

8th

puffer

9.1, 9.2, 9.3

Collecting yarn guides

10.1, 10.2, 10.3

preparation device

11.1, 11.2, 11.3

Einzelgalette

12.1, 12.2, 12.3

Guide roll

13

drawing device

14.1, 14.2, 14.3, 14.4

godet

15

Multiple yarn guides

16

idler pulley

17

takeup

18.1, 18.2, 18.3

winding positions

19.1, 19.2

spindles

20

spindle turret

21.1, 21.2, 21.3

Do the washing up

23

Drive the single godets

24.1, 24.2

Drive the draw godets

25

machine frame

26

crimping

27

texturing

28

chill roll

29

yarn sheet

30

yarn plug

31.1, 31.2

godet

32

swirling

33

roller drive

34

Drive the deduction godet

Claims (12)

1. A method for melt-spinning, drawing, and winding multiple synthetic threads, in which after extrusion of fine filament strands the synthetic threads are spun, cooled and pulled of parallel to one another, and in which the threads are drawn collectively as a sheet of strands and wound to bobbins, characterized in that after the extrusion and before the collective drawing, the threads are pulled off independently by separate individual godets.
2. The method according to claim 1, characterized in that the threads are drawn in a straight thread path, each with the same take-off speed at the individual godets.
3. The method of claim 1 or 2, characterized in that the threads are guided on the periphery of the individual godets, each with a multiple wrap.
4. The method according to one of claims 1 to 3, characterized in that after being pulled off, the threads are merged into a sheet of strands, and that the sheet of strands is drawn by being guided on a plurality of successively arranged godets.
5. The method according to claim 4, characterized in that the first drawing godet is driven at a peripheral speed that is equal to or greater than the pull-off speed of the individual godets.
6. The method according to one of claims 1 to 5, characterized in that after the drawing and before the winding-up, the threads are crimped parallel to each other.
7. An apparatus for carrying out the method according to one of claims 1 to 6, comprising a spinning device (1), which has a plurality of spinnerets (4.1, 4.2, 4.3) for extruding a plurality of filaments strands per thread (5.1, 5.2, 5.3), with a drawing device (13), which comprises a number of godets (14.1, 14.2, 14.3, 14.4) that are arranged after each other for the collective drawing of the threads, and with a winding device (17), which comprises a plurality of winding positions (18.1, 18.2, 18.3) for the collective winding of the threads to a plurality of bobbins (21.1, 21.2, 21.3), characterized in that several juxtaposed individual godets (11.1, 11.2, 11.3) are arranged upstream the drawing device (13), each of said individual godets (11.1, 11.2, 11.3) being associated with one of the threads (5.1, 5.2, 5.3) and being formed individually drivable to pull off the respective thread.
8. The apparatus according to claim 7, characterized in that the individual godets (11.1, 11.2, 11.3) are associated with the spinnerets (4.1, 4.2, 30 4.3) at a distance and in a centered position.
9. The apparatus according to claim 7 or 8, characterized in that each of the individual godets (11.1, 11.2, 11.3) for guiding the threads is associated with a rotatably mounted overtravel rollers (12.1, 12.2, 12.3).
10. The apparatus according to claim 9, characterized in that each of the individual godets (11.1, 11.2, 11.3) comprise a heated godet shell.
11. The apparatus according to one of claims 7 to 10, characterized in that a first drawing godet (14.1) of the drawing device (13) is arranged laterally adjacent to the individual godets (11.1, 11.2, 11.3) held in a series, and that the first drawing godet (14.1) is associated on its inlet side with a multiple thread guide (15).
12. The apparatus according to one of claims 7 to 11, characterized in that between the drawing device (13) and the winding device (17), a crimping device (26) is arranged that comprises several texturing means (27) for collective crimping of the threads.

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