EP2721203B1 - Method and device for producing a crimped multifilament thread - Google Patents

Description

The invention relates to a method for producing a crimped multifilament (BCF) according to the preamble of claim 1 and to an apparatus for producing a crimped multifilament (BCF) according to the preamble of claim 8.

In the production of carpets, for example by tufting or weaving, a so-called BCF (bulked continuous filament) yarn is presented as pile yarn, which is previously produced in a melt-spinning process. In the case of such multifilament threads, care must be taken in particular during further processing that there is sufficient thread closure between the filaments of the thread. The thread closing of the filaments of the thread is ensured in the manufacturing process essentially by a plurality of intertwining knots, which are generated before winding the thread on the thread. Such interlacing nodes are generated by a compressed air treatment of the thread. In order to enable a perfect further processing of the thread into a carpet product, a certain node stability as well as a relatively high number of entangling nodes per unit length in the BCF thread are desired.

In the generic method and the generic device for producing a crimped multifilament such knotting nodes are usually generated by a turbulence of the filaments of the thread. Such a method and such a device are for example in the EP 0 784 109 B1 described. To swirl the filaments, the yarn is passed through a treatment channel of a swirling nozzle, in which a continuous stream of compressed air is directed across the thread. Depending on the Thread guide, the geometric design of the treatment channel and the overpressure of the compressed air are intense turbulence up to interlacing knots on the thread. The number of entanglement nodes per unit of length produced on the thread and the knot formation of the filaments in the thread can not be produced reproducibly due to the thread vibrations even with constant overpressure of the compressed air, so that the knot stability and the distances between the intertwining nodes depend more or less on the vibration behavior of the thread and occur in larger tolerances. Such variations in the knot stability of the knit nodes as well as the fluctuation in the number of knots per unit length of thread result in coloration of undyed yarns being very different depending on knot stability and number of knots. In the production of so-called colored tricolor threads, in which several colored filament bundles are spun and subsequently combined into a crimped thread, irregularities in knotting and the number of knots lead to undefined visual effects in the subsequent further processing of the thread into a carpet product.

Also the GB-2321651-A describes a generic method.

It is an object of the invention to develop a generic method for the production of a crimped multifilament yarn and a generic device for producing a crimped multifilament yarn such that the thread has reproducible and uniform entanglement node to form the thread conclusion.

Another object of the invention is to provide a method and apparatus of the generic type for producing a crimped multifilament yarn in which a predetermined pattern of intertwining knots can be produced on the yarn and used for visual patterning in a carpet product.

This object is achieved according to the method for the fact that a pulse train of compressed air pulses with a predetermined frequency is directed to the thread to generate the entanglement.

The inventive device solves the problem in that the treatment device has a controllable blowing means for generating a periodically on the thread-directed compressed air pulse.

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

The invention is based on the recognition that the interlacing nodes in the thread can significantly influence the visual appearance of a carpet product. For example, in the processing of a multicolored thread in a single-ply tufting machine, a carpet could be produced which shows superimposed regular patterns, so-called repeat strips. It has been found that this effect can be influenced by varying the stability of the accounts and by varying the intersections of the interlacing nodes in the thread. In that regard, the invention has the particular advantage that depending on the desired pattern in the carpet, this effect can be harnessed. Thus, it is well known that a compressed air pulse directed at the thread leads to a spontaneous and pronounced formation of intertwining nodes. In that regard, can be generated by the sequence of a plurality of compressed air pulses having a predetermined frequency, a pattern of entanglement nodes on the thread. The pulse train of recurring pulses of compressed air ensures a reproducible pattern of knotting nodes on the current thread. In this case, uniform or even uneven sequences of intertwining nodes can be generated on the thread.

In order to ensure the thread closure of the thread for further processing, the method variant is preferably used, in which the frequency of the pulse train of compressed air pulses is set in response to a thread speed such that at least one number of 5 to 35 interlacing nodes on the thread per meter length be generated. Depending on the type of thread (whether monocolor or tricolor) and depending on further processing, the desired number of intertwining nodes can be preset on the thread.

The method according to the invention can be used particularly advantageously at relatively high yarn speeds. In order to produce a sufficient number of entanglement nodes on the thread, according to an advantageous development of the method according to the invention, the thread with a thread speed in the range between 2,000 m / min. and 6,000 m / min. guided between two driven godets. As a result, the guide properties of the thread required for the formation of the intertwining nodes can be adjusted individually by the driven godets.

The method in which the compressed air pulses are generated by a rotationally driven nozzle ring with a thread running track with at least one nozzle bore in the thread running track, is particularly advantageous to reproducibly generate the compressed air pulses at a relatively high frequency. In this case, the nozzle bore is periodically connected by rotation of the nozzle ring with a pressure source, so that a compressed air flow is passed through the nozzle bore in the thread running track for a short period of time.

Another particular advantage of the generation of compressed air pulses by a driven nozzle ring is given by the fact that the presetting of the frequency of the pulse train is possible by a drive of the nozzle ring. In that regard, the variant of the method is particularly preferred wherein the nozzle ring is driven to set the frequency of the pulse train at a predetermined peripheral speed.

Depending on the desired number of entanglement nodes and depending on the thread speed so that a large adjustment range is possible. By the process variant in which the peripheral speed of the nozzle ring is adjusted in relation to the yarn speed to a maximum of 50% smaller or larger value, all current BCF yarns can be produced.

In order to obtain alternating pressure pulses or changing frequencies within a pulse sequence, the method variant is particularly advantageous, in which the peripheral speed of the nozzle ring per unit time is changed periodically. This advantageously allows irregular patterns to be generated at interlacing nodes in the thread. Such irregularities of the patterns can also be achieved by employing a nozzle ring having circumferentially unevenly distributed nozzle bores which are driven at a constant or varying peripheral speed.

The device according to the invention has the particular advantage that in the treatment of the thread, the consumption of compressed air is reduced to a minimum. Thus, only during the compressed air pulse via the blowing agent, a compressed air flow for the treatment of the thread delivered. In the phases between the compressed air pulses no compressed air consumption takes place, so that the consumption compared to conventional permanently operating turbulators is significantly reduced.

To set the pulse sequence of the compressed air pulses and their frequency is in accordance with the device according to the invention, the blowing agent by a rotationally driven Nozzle ring formed with a circumferential thread running track and at least one opening into the thread running track nozzle bore. The nozzle ring is coupled to a compressed air source such that upon rotation of the nozzle ring, the nozzle bore is periodically connectable to the compressed air source. Thus, recurring compressed air pulses in a predetermined frequency and sequence can be generated in a simple manner on the circumference of the nozzle ring.

The circumferential speed of the nozzle ring, which is proportional to the frequency of the pulse sequence of the compressed air pulses, can be changed in particular by the fact that the nozzle ring is coupled to an electric motor and a control unit associated with the electric motor. By specifying a set frequency, the pulse sequence of the compressed air pulses can be generated at a constant frequency.

To be able to produce in particular irregular pulse sequences of compressed air pulses with irregular frequency, the development of the invention is particularly advantageous, in which the electric motor is designed as an unregulated asynchronous motor. In this case, the random deviations of the uncontrolled asynchronous motor can be used in order to be able to produce an irregular pattern of intertwining nodes in the thread.

For the presetting and control of the treatment device, the device according to the invention is preferably designed such that the control device is connected to a central machine control unit. Thus, all parameters and machine settings that are essential for the production of the thread can be entered directly. Desired ratios between the yarn speeds of the godets and the peripheral speed of the nozzle ring can be evaluated directly in the machine control unit and corrected accordingly.

For shielding and in particular for noise reduction is further provided that the nozzle ring is disposed within an enclosure with a thread inlet and a thread outlet. The encapsulation is formed with the thread inlet and the thread outlet such that the thread contacts the nozzle ring at least with a minimum wrap angle and is guided in the thread running track. The encapsulation is preferably formed multi-walled, wherein an inner wall is preferably formed from a Schallisoliermaterial.

For receiving and fixing the nozzle ring is arranged with the encapsulation on a front side of a support wall, wherein the support wall carries on a rear side of the electric motor of the nozzle ring. Thus, the mechanical components can be advantageously separated from the electrical components. The sensitive to the thread environment electronic components are thus separated from the thread-guiding parts on the front of the support wall.

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

Fig. 1

schematisch eine Vorderansicht eines Ausführungsbeispiels der erfindungsgemäßen Vorrichtung

Fig. 2

schematisch eine Seitenansicht des Ausführungsbeispiels aus Fig. 1

Fig. 3

schematisch einen zeitlichen Verlauf einer Impulsfolge von Druckluftimpulsen

Fig. 4

schematisch eine Ansicht eines multifilen Fadens mit Verflechtungsknoten

Fig. 5

schematisch eine Längsschnittansicht eines Blasmittels zur Erzeugung einer Impulsfolge von Druckluftimpulsen

Fig. 6

schematisch eine Querschnittansicht des Ausführungsbeispiels aus Fig. 3

They show:

Fig. 1

schematically a front view of an embodiment of the device according to the invention

Fig. 2

schematically a side view of the embodiment of Fig. 1

Fig. 3

schematically a time course of a pulse train of compressed air pulses

Fig. 4

schematically a view of a multifilament yarn with intertwining knots

Fig. 5

schematically a longitudinal sectional view of a blowing agent for generating a pulse train of compressed air pulses

Fig. 6

schematically a cross-sectional view of the embodiment of Fig. 3

In the Fig. 1 and 2 An embodiment of the device for producing a crimped multifilament yarn is shown in several views. Fig. 1 shows the embodiment in a front view and Fig. 2 in a side view. Here, only one threadline for explaining the individual devices is shown in each case. In principle, such devices can be operated with several parallel guided threads.

Unless an explicit reference is made to one of the figures, the following description applies to both figures.

The apparatus comprises a spinning device 1, which in this embodiment comprises a sense bar 1.1, a spinneret 1.2, a spinning shaft 1.3, a cooling device 1.4 and a melt feed 1.5 to extrude and cool a plurality of filament strands from a supplied polymer melt. For this purpose, the spinneret 1.2 is held on the underside of the spinneret 1.1, wherein the spinneret 1.1 could still have several spinnerets, not shown here. Within the heated spinning beam 1.1 are arranged in the distribution system and spinning pumps to supply a fed via the formed in the top melt feed 1.5 polymer melt of the spinneret 1.2 under pressure.

Below the spinning beam 1.1, the cooling device 1.4 is arranged, which cooperates with the spinning shaft 1.3. The cooling device 1.4 is formed in this embodiment as a cross-flow blowing and has a balsewall 1.6 and one connected to the blowing wall 1.6 Pressure chamber 1.7 on. Thus, a transversely directed cooling air flow can be generated to cool the freshly extruded filaments and blow into the spinning shaft 1.3.

Below the spinning shaft 1.3 a drawing device 2, a crimping device 3 and a winding device 4 are arranged to a yarn path on a vertically oriented support wall 14.

In order to be able to guide and treat the cooled filaments as a filament bundle, the drawing device 2 is first assigned a collection thread guide 8, a preparation device 9, through which the filaments are guided to form a filament bundle. Furthermore, a thread chipper 10 and a suction nozzle 11 is provided to ensure a continuous spinning process in a thread break in the downstream facilities. Thus, in a yarn breakage in one of the device, the filament bundle would be separated by the yarn chopper 10 and fed via the suction nozzle 11 to a Garnabfallbehälter.

The stretching device 2 has a plurality of heatable godets 2.1 to 2.4, which are held cantilevered on a front side of the support wall 14. At the back of the support wall 14, the godets 2.1 to 2.4 associated godet drives are arranged. In Fig. 2 is exemplified the godet drive 2.5 and 2.6 shown.

In the yarn path immediately below the drawing device, the crimping device 3 is provided, which is formed in this embodiment by a texturing 3.1, a stuffer box 3.2 and a cooling drum 3.3. The texturing 3.1, the stuffer box 3.2 and the cooling drum 3.3 are held on the front side of the support wall 14. In this case, the cooling drum 3.3 is rotatably mounted and with a in Fig. 2 not shown drive coupled.

Between the crimping device 3 and the winding device 4, a relaxation device 5 is provided, which has two spaced-apart godet units 5.1 and 5.2 on the front side of the support wall 14, which are driven by the godet drives 5.3 and 5.4 held on the rear side of the support wall 14.

Between the godet units 5.1 and 5.2, a treatment device 6 is provided to perform compressed air treatment on the crimped multifilament yarn. For this purpose, the treatment device 6 on a controllable blowing 6.1, which is coupled to a control means 6.2 and a control unit 6.3 on the back of the support wall 14.

The winding device 4 is also held on the support wall 14. For winding up the thread, the winding device 4 has two driven winding spindles 4.2 and 4.3, which are held on a rotatable winding turret 4.1. Due to the winding turret 4.1, the winding spindles 4.2 and 4.3 are alternately guided between an operating position and a change position. In the operating position, the winding spindles 4.2 and 4.3 cooperate with a pressure roller 4.5 and a traversing device 4.6. The spindles 4.2 and 4.3 and the winding turret 4.1 and the traversing device 4.4 associated drives are held on the back of the support wall 14. Thus, the winding spindles 4.2 and 4.3, the spindle drives 4.6 and 4.7, the winding turret 4.1, the turret drive 4.8 and the traversing 4.4 of the traverse drive 4.9 assigned.

The drives and control devices arranged on the rear side of the support wall 14 are connected in a machine control unit 13. The machine control unit 13 can be operated via a control panel 12 arranged on the front side of the support wall 14. Thus, all facilities can be controlled by an operator via the control panel 12 in their functions and parameter settings.

With the in Fig. 1 and 2 A crimped multifilament thread can be produced which is also known in the art as Bulked Continues Filament (BCF) thread. Such threads are preferably used to produce a carpet product in a tufting process or a weaving process. First, a plurality of filaments 7 of at least one polymer melt is extruded through the spinneret 1.2. The polymer melt is produced by an extruder, not shown here, and fed to the spinning beam 1.2 via the melt feed 1.5. After extruding the filaments 7, they are cooled directly by the cooling device 1.4 by means of a transversely injected cooling air flow and brought together by the preparation device 9 and the collecting yarn guide 8 to form a filament bundle 42. In this case, the cohesion of the filaments 7 in the filament bundle 42 is generated essentially by a spin finish.

Subsequently, the filament bundle 42 is stretched between the godets 2.1 to 2.4 of the drawing device 2 and then crimped by the crimping device 3. Within the crimping device 3, the filament bundle 42 is upset by the texturing 3.1 in the stuffer box 3.2 to a yarn plug 15. For this purpose, the filament bundle 42 is conveyed by means of a heated fluid from the texturing 3.1 into the stuffer box 3.2. The heated yarn plug 15 is then cooled on the circumference of the cooling drum 3.3.

The yarn plug 15 is dissolved into the crimped yarn 16, wherein the godet units 5.1 of the relaxation device 5, the yarn 16 from the cooling drum 3.3 subtracts. Within the relaxation device 5, a tension treatment on the thread 16, which is essentially adjustable by the differential speed of the godet units 5.1 and 5.2, succeeds. At the same time, a thread closure required for further processing is produced on the thread 16. For this purpose, the thread in the treatment device 6 by a blowing 6.1 with a pulse-like Treated compressed air stream. Through a continuous pulse train of recurring pulses of compressed air, which swirl transversely directed the thread 16, a plurality of intertwining nodes on the thread 16 are generated. The pulse sequence of the pressure pulses is generated at a predetermined frequency by the control means 6.2 of the blowing agent 6.1, so that form a uniform reproducible number of entanglement nodes per unit length of the thread 16. The frequency of the pulse sequence of the compressed air pulses, which act on the thread by the blowing agent 6.1, are preferably set as a function of a thread speed such that at least a number of 15 to 35 interlacing nodes are produced on the thread 16 per one meter in length. The thread speed can here in a range between 2,500 m / min. up to 6,000 m / min. be. In order to set the frequency of the pulse train, the control device 6.2 is assigned the control device 6.3, wherein the specifications for the adjustment were given to the control device 6.3 directly via the machine control unit 13.

For further explanation of the treatment device 6 is in Fig. 3 represented in a diagram, a pressure curve of the compressed air pulses over time. The time axis is formed by the abscissa and on the ordinate the overpressure of the pressure pulses is entered.

As from the illustration in Fig. 3 As can be seen, the compressed air pulses generated by the blowing agent 6.1 are each the same size, each setting a constant pulse time. The pulse time is entered with the lower case letter t ₁ on the time axis. There is a pause between successive pulses of compressed air. The break time is in Fig. 3 indicated by the lower case letter t _P. In this case, a recurring compressed air treatment is carried out on the thread 16 by a continuous pulse train. The compressed air pulses are directed at a predetermined frequency on the thread, so that, for example, depending on the thread speed a certain number of Interweaving nodes arise on the thread. At least one interlacing knot forms on the thread per compressed air pulse.

The change in the pause time t _P between the compressed air pulses has a direct effect on the formation of the intertwining nodes in the thread 16. In Fig. 4 schematically a portion of the thread 16 is shown, wherein a plurality of interlacing nodes 40 follow each other at regular intervals. The distances between adjacent interlacing nodes 40 are in the Fig. 4 entered with the code letter A. Thus, between the intertwining nodes 40 at a uniform pulse train of the pressure pulses forms uniform intervals. Since the dead times t _P between the compressed air pulses have a proportional effect on the distance A between the intertwining nodes 40 in the thread 16, the distance A can also be influenced by changing the pause times.

This in 3 and 4 illustrated embodiment for generating the entanglement nodes by the blowing means 6.1 is only an example. By the blowing means 6.1 associated control means 6.3 uneven pulse sequences of compressed air pulses with irregular frequency can be generated, so that the pattern generated in the thread 16 of the interlacing nodes 40 also appear irregular. Thus, both regular patterns of interlace nodes generated with high repeatability and irregular patterns of interlace nodes on the thread 16 can be generated.

As from the illustration in Fig. 1 and 2 As can be seen, the thread 16 is wound into a coil 17 at the end of the process. In the in Fig. 1 and 2 shown position, the thread 16 of the winding spindle 4.2 is wound into a coil 17. For this purpose, the thread is guided back and forth by the traversing device 4.4 within a traverse stroke and deposited on the surface of the spool 17 via the pressure roller 4.5.

At the in Fig. 1 and 2 As shown, the blowing means 6.1 for generating the intertwining nodes in the thread 16 is not specified. Basically, this known compressed air control means can be used, which generate a compressed air pulse by switching on and off a compressed air source. Preferably, however, rotating means are used to generate a pulse train of compressed air pulses at high frequencies.

So is in Fig. 5 and 6 an embodiment of a blowing 6.1 shown, as for example in the embodiment of Fig. 1 and 2 could be used. In the Fig. 5 and 6 the blowing agent 6.1 is shown schematically in several views. Fig. 5 shows the embodiment in a longitudinal sectional view and in Fig. 6 the embodiment of the blowing 6.1 is shown in a cross section. Unless an explicit reference is made to one of the figures, the following description applies to both figures.

The embodiment of the blowing means 6.1 for generating interlace knots in the crimped multifilament yarn 16 has a rotating nozzle ring 18, which is cup-shaped and connected via an end wall 20 and a hub 21 with a drive shaft 22. The hub 21 is for this purpose attached to a free end of the drive shaft 22.

The nozzle ring 18 is guided with a centering diameter jacket-shaped on a guide collar 28, a stator 19. At the periphery of the nozzle ring 18 has a circumferential Fadenlauspur 23, in whose groove bottom a nozzle bore 24 opens, which penetrates the nozzle ring 18 completely up to an inner centering diameter. In this embodiment, the nozzle ring 18 two offset by 180 ° to each other nozzle bores 24 which open into the bottom of the yarn guide track 23. Basically, the number and the arrangement the nozzle bore 24 formed in the nozzle ring 18 by way of example. Whether one or more nozzle bores 24 are contained in the nozzle ring 18 depends on the respective process and the type of thread, since the number of nozzle bores 24 can essentially influence the frequency of the pulse sequence of the generated compressed-air pulses. In addition, the nozzle bores 24 may be formed at equal intervals or to produce certain patterns with unequal distances from each other on the circumference of the nozzle ring 18.

The stator 19 has at the periphery of the guide collar 28 at a position a chamber opening 26 which is connected to a pressure chamber 25 formed in the interior of the stator 19. The pressure chamber 25 is connected via a compressed air connection 27 with a compressed air source, not shown here. The chamber opening 26 on the guide collar 28 and the nozzle bores 24 in the nozzle ring 18 are formed in a plane, so that the nozzle bores 24 are alternately guided in the region of the chamber opening 26 by rotation of the nozzle ring 18. The chamber opening 26 is formed as a slot and extends in the radial direction over a longer guide region of the nozzle bore 24. The length of the chamber opening 26 thus determines the pulse time t _{1 of} the compressed air pulses.

The stator 19 is held on the support wall 14 and concentric with the guide collar 28 has a bearing bore 33, which continues in the support wall 14. Within the bearing bore 33, the drive shaft 22 is rotatably supported by the bearing 35.

At the back of the support wall 14, the drive shaft 22 is coupled to an electric motor 34, through which the nozzle ring 1 can be driven at a predetermined peripheral speed. The electric motor 34 acts as a control 6.2 and could directly on the in Fig. 2 represented control unit 6.3 are controlled.

In the area of the chamber opening 26 on the circumference of the guide collar 28, a cover 29 is assigned to the nozzle ring 18 on the opposite side. The cover 29 is held axially displaceable on the stator 19 in this embodiment and can be moved to open the yarn guide track 23 in a contact position. Via a spring 23, the cover 29 is moved to an operating position in which a looped area of the thread running track of the Düsenringesl8 is covered.

Alternatively, it is also possible to connect the cover 29 fixed to the support wall 14 and form a Einfädelschlitz between the cover 29 and the nozzle ring 18, through which the thread in the thread running track 23 can be threaded.

The nozzle ring 18 is arranged within an encapsulation 41, which is formed in this embodiment by an inner housing wall 36 and an outer housing wall 37. The inner housing wall 36 is preferably formed of a sound absorbing material to dampen the airborne sound waves excited by the compressed air pulses. The encapsulation 41 is detachably arranged on the stator 19. Alternatively, the encapsulation 41 could also be designed such that the stator 19 is also encapsulated in relation to the environment. In this case, the encapsulation would be releasably connected to the support wall 14.

For thread guidance, the encapsulation 41 in each case has a thread inlet 38 and a thread outlet 39, to each of which an inlet thread guide 31 and an outlet thread guide 32 are assigned. The thread 16 can thus be guided between the inlet yarn guide 31 and the outlet yarn guide 32 with a partial looping on the nozzle ring 18.

The yarn inlet guide 31 and the thread outlet yarn guide 32 are arranged outside of the enclosure 41 in this embodiment. In principle, however, it is also possible to arrange the inlet yarn guide 31 and the outlet yarn guide 32 in the interior of the capsule 41.

The yarn inlet guide 31 and the outlet yarn guide 32 can be formed by deflecting pins or pulleys. In a thread guide arranged outside the encapsulation, it is also possible to form the yarn guides 31 and 32 directly by driven godets, so that the nozzle ring 18 could be arranged directly in the yarn path between the godets.

At the in Fig. 5 and 6 shown blowing means is introduced to generate interlacing nodes in the multifilament yarn 16, a compressed air in the pressure chamber 25 of the stator 19. The nozzle ring 18, which guides the thread 16 in the thread running track 23, generates a compressed-air pulse within the pulse time t ₁ as soon as one of the nozzle bores 24 reaches the chamber opening 26. The compressed air pulse is directed at the thread and leads to a local swirling on the multifilament thread 16, so that form on the thread one or more interlacing nodes.

In order to perform the compressed air pulses as a pulse train with a predetermined frequency, the nozzle ring 18 is driven via the electric motor 34 at a predetermined peripheral speed. The peripheral speed of the nozzle ring 18 can be adjusted in proportion to the yarn speed of the yarn 16 depending on the desired frequency such that the yarn 16 is guided with slip or with a conveying effect. It has been found that the setting range of the circumferential speed is selected such that the peripheral speed of the nozzle ring 18 is set to a value smaller or larger by a maximum of 50% in relation to the thread speed of the thread 16. There is a possibility that the peripheral speed of the nozzle ring 18 is changed to produce an irregular pattern of entangling nodes in the yarn 16 between a lower limit of the peripheral speed and an upper limit of the peripheral speed. Thus, by means of a sinusoidal change in the peripheral speed, an irregular pattern of entanglement nodes in the thread can be generated reproducibly.

Alternatively, however, it is also possible to form the electric motor by an unregulated asynchronous motor. In this case, the engine slip can advantageously be used to produce an irregular pattern of entanglement nodes on the thread 16.

This in Fig. 4 and 5 Illustrated embodiment of the blowing agent is thus particularly suitable to produce both uniform or non-uniform pattern of knotting in the thread. Such patterns of interlacing knots in the thread can thus be used to advantage to obtain visual effects in the final product of a carpet product.

The method according to the invention is thus also particularly suitable for producing multicolored threads. This could be done at the in Fig. 1 and 2 apparatus shown in the spinning device, three differently colored filament bundles are extruded, which are drawn off in parallel and stretched and then textured together. Such devices are well known, so that no further explanation takes place at this point. The generation of the merge nodes in the multicolor thread is as before in the embodiments after Fig. 1 and 2 and the embodiments according to Fig. 5 and 6 shown and described executed.

LIST OF REFERENCE NUMBERS

1

spinner

1.1

spinning beam

1.2

spinneret

1.3

spinning shaft

1.4

cooler

1.5

melt feed

1.6

blowing wall

1.7

pressure chamber

2

drawing device

2.1

Galette

2.2

Galette

2.3

Galette

2.4

Galette

2.5

godet

2.6

godet

3

crimping

3.1

texturing

3.2

stuffer

3.3

cooling drum

4

takeup

4.1

spindle turret

4.2

winding spindle

4.3

winding spindle

4.4

Traversing device

4.5

pressure roller

4.6, 4.7

spindle drive

4.8

revolver drive

4.9

Traversing drive

5

relaxation device

5.1

galette

5.2

galette

5.3, 5.4

godet

6

treatment facility

6.1

blowing agent

6.2

control means

6.3

control unit

7

filament

8th

Collecting yarn guides

9

preparation device

10

thread hacker

11

suction

12

Control panel

13

Engine control unit

14

support wall

15

yarn plug

16

thread

17

Kitchen sink

18

nozzle ring

19

stator

20

bulkhead

21

hub

22

drive shaft

23

Yarn track

24

nozzle bore

25

pressure chamber

26

chamber opening

2 7

Compressed air connection

28

guide collar

29

cover

30

feather

31

Inlet yarn guide

32

Outlet yarn guide

33

bearing bore

34

electric motor

35

camp

36

Inner housing wall

37

Outer housing wall

38

inlet thread

39

thread outlet

40

intertwining knots

41

encapsulation

42

filament bundles

Claims (12)

1. A method for the production of a crimped multifilament thread (BCF), wherein a multiplicity of filaments of at least one polymer melt is extruded, in which the filaments are gathered after cooling into a filament or multiple filament bundles, in which the filament or the filament bundles are stretched and pressed and crimped and in which the thread plug is resolved as crimped thread and wound into a spool, wherein in the crimped thread prior to winding a multiplicity of intertwined knots is created, characterized by the directing of a pulse sequence of compressed air pulses to the thread at a predetermined frequency for producing the intertwined knot, at which the compressed air pulses are generated by a nozzle ring having a rotationally driven thread guide track and at least one nozzle bore in the thread guide track, wherein the thread is guided in the thread guide track and wherein the nozzle bore is connected with a compressed air source by periodic rotation of the nozzle ring.
2. A method according to claim 1, characterized in that the frequency of the pulse sequence of the compressed air pulse is adjusted depending on a thread speed, such that on the thread per one meter length at least a number from 5 to 35 of intertwined knots are created.
3. A method according to claim 1 or 2, characterized in that the thread with a thread speed in the range between 2,000 m/min and 6,000 m/min is guided between two driven godets.
4. A method according to claim 3, characterized in that the nozzle ring is driven to set the frequency of the pulse sequence at a predetermined peripheral speed.
5. A method according to claim 4, characterized in that the peripheral speed of the nozzle ring in relation to the thread speed is set at a smaller or larger value by a maximum of 50% to set the frequency of the pulse sequence at a predetermined peripheral speed.
6. A method according to claim 5, characterized in that the peripheral speed of the nozzle ring per unit of time is periodically changed.
7. A device for manufacturing a crimped multifilament thread (BCF) by a spinning apparatus (1), with a stretch apparatus (2) with a crimping apparatus (3), with a treatment apparatus (6) for production of an intertwined knot and with a winding apparatus (4), whereby the treatment apparatus (6) is arranged in the thread track between two driven godets (5.1, 5.2), characterized in that the treatment apparatus (6) has a controllable blowing agent (6.1) for periodically producing a compressed air pulse directed on the thread, at which the blowing agent (6.1) comprises a rotationally driven nozzle ring (18) with a peripheral thread guide track (23) and comprises at least one nozzle bore opening into the thread guide track (23) which is periodically connected with a compressed air source (27) by rotation of the nozzle ring (18).
8. Device according to claim 7, characterized in that the nozzle ring (18) is coupled to an electric motor (34) and to one of the electric motor's (34) associated control apparatus (6.3).
9. Device according to claim 8, characterized in that the electric motor (34) is designed as an unregulated asynchronous motor.
10. Device according to claim 8 or 9, characterized in that the control apparatus (6.3) is connected with a central machine control unit (13).
11. Device according to one of claims 7 to 10, characterized in that the nozzle ring (18) is arranged within an enclosure (41) having a thread inlet (38) and a thread outlet (39).
12. Device according to claim 11, characterized in that the enclosure (41) is arranged at one front side of a support wall (14), wherein the support wall (14) on one side supports the electric motor (34) of the nozzle ring (18).

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