EP2947187B1 - False twist device for an open-end spinning device - Google Patents

Description

The present invention relates to a false twist device for an open-end spinning device for introducing a false twist into a yarn produced in the open-end spinning device. The false twist device has a substantially cylindrical body as well as a plurality of false twist edges disposed in the yarn withdrawal direction one behind the other and opposite the yarn withdrawal direction at an angle in the body. Furthermore, the invention relates to an open-end spinning device with such a false twist device and a method for introducing a false twist into a yarn produced in an open-end spinning device of a rotor spinning machine.

In the production of yarns in an open-end spinning apparatus of a rotor spinning machine, the spinning rotor is fed with staple fibers dissolved in individual fibers and withdrawn as a spun yarn having a twist via a yarn draw-off nozzle arranged centrally in the spinning rotor. In this case, by the rotation of the spinning rotor, the individual fibers in the end of the already produced yarn, which extends as a rotating yarn leg between the rotor groove and the Garnabzugsdüse, integrated and granted the yarn rotation. The spinning stability of the open-end spinning device depends essentially on the rotation of the rotating yarn leg extending between the yarn draw-off nozzle and the rotor groove. A too low yarn twist always has a negative effect on the spinning stability. There are therefore known in the art various false twist devices, by means of which, contrary to the take-off direction of the yarn rotations can be pushed back as false twist in the direction of the spinning rotor. This makes it possible to get the real one To increase rotation in the yarn section between the Garnabzugsdüse and the rotor groove.

The DE 40 39 755 A1 shows such Garnabzugseinrichtung a rotor spinning machine, in which the Garnabzugsdüse is followed by a Garnumlenkstelle at which the yarn is drawn off over obliquely to the yarn run false twist edges. The false twist edges can have a substantially circular cross section, web-like or triangular. In this case, a greater false twist can be generated, the more sharp-edged the profile of the false twist edges. However, damage to the yarn surface can occur if the false-edged edge is too sharp, so that in practice a compromise must always be made between introducing as much false twist as possible and avoiding damage to the yarn.

The DE 197 18 768 A1 shows a false twist element with three false twist edges, which lie obliquely to the yarn path. The false twist edges can be formed as notches, webs or other profilings. The profilings are arranged in a bent pipe piece, so that the yarn is deflected at each of the false twist edges.

Also at the DE 37 23 504 A1 three false twist edges are arranged in a curved channel. The individual Garnumlenkelemente can be designed as usable in tangential holes of the channel pins.

According to the GB 2 017 167 A For example, a false twist device is formed by inserting a spiral wire into a bent pipe section. In this case, only a single turn of the spiral wire, which is positioned in the region of a bend of the bent pipe section, acts as a false twist edge. The other turns have the function to fix the spiral wire in the bent tube. The wire is rounded and therefore less aggressive.

In addition to the execution of the profile of the false twist edges, the generation of the false twist is further influenced by the wrap angle of the yarn with respect to the false twist edge. The DE 87 02 807 U1 therefore proposes to arrange a further deflection or a further false twist edge, which is arranged opposite to the first false twist edge, and deflects the yarn in a direction deviating from the direction of the preceding deflection to one of the yarn withdrawal nozzles following the false twist edge. As a result, the angle of wrap of the yarn at the first false twist edge can be increased and a lifting of the yarn from the false twist edge can be avoided. The effect of the false twist edge can thereby be improved. Incidentally, however, the introduction of the false twist is also influenced by the sharp edges of the false twist edges, so that here too the possibilities of introducing a false twist without damaging the yarn are limited.

The JP S50 45438 U shows a twist accumulation device, in which a plurality of swirl dam edges are arranged opposite one another. Again, by the arrangement of the swirl dam edges of the wrap angle of the yarn increases and thus indeed increases the effect of the swirl dam edges, but at the same time the yarn also stressed more.

Likewise, the show JP S51 13563 Y1 and the JP S52 91922 A False twist devices in which the yarn is guided over two mutually opposing swirl dam edges.

The WO 2013/117495 A1 shows, however, a false twist device in which the yarn to form a false twist in a helically formed Gutter is led. This should give the yarn torque. The use of false twist edges is described there as disadvantageous because the yarn is thereby loaded.

The object of the present invention is therefore to enable improved false twist generation with only a small load of the yarn.

The object is solved by the features of the independent claims.

A false twist device for an open-end spinning device for introducing a false twist into a yarn produced in the open-end spinning device has a substantially tubular body and a plurality of false twist edges disposed in the yarn withdrawal direction one behind the other and opposite the yarn withdrawal direction at an angle in the body. It is provided that at least three false twist edges protrude into the interior of the tubular body in such a way that the yarn undergoes a deflection at each of the false twist edges. At the same time, the false twist edges are offset in the body in the circumferential direction, so that the yarn additionally experiences a spatial, helical deflection relative to its regular yarn withdrawal direction due to the successive deflections at the at least three false twist edges. The false twist device is arranged downstream of a Garnabzugsdüse in an open-end spinning a rotor spinning machine in Garnabzugsrichtung to push back rotations as false twist in the direction of the spinning rotor.

In a method for introducing a false twist into a yarn produced in an open-end spinning device of a rotor spinning machine, the yarn is drawn off via a yarn take-off nozzle and drawn over false twist edges arranged in a false twist device arranged downstream of the yarn take-off nozzle, whereby a false twist is imparted to the yarn. It is intended the yarn is subjected to a spatial, helical deflection from its regular yarn take-off direction by at least three false twist edges, whereby an additional false twist is imparted to the yarn.

It is thus provided that in the method or in the false twist device of the false twist is generated as in known false twist devices on false twist edges. In this case, the yarn is deflected in each case at defined, successive in the yarn path points of the false twist device by the arrangement of several false twist edges. At the same time, however, the yarn is given a torque by the deflection at the points defined by the false twist edges, since it undergoes a rotation or a corresponding spatial deflection due to the offset in the circumferential direction false twist edges by the sequence of deflections.

Due to the fact that the false twist is imparted to the yarn by two different mechanisms of action, significantly more false twist can be generated than in a conventional false twist device and thus the spinning stability can be increased. Due to the high false twist insertion, it is thus also possible to spin with a lower yarn twist, with which otherwise sufficient spinning stability could not be achieved. Due to the improved false twist training, it is also possible to perform the false twist edges less sharp-edged and thereby introduce the false twist particularly yarn gently.

According to an advantageous embodiment of the false twist device, the false twist edges have a height that is greater than half the inner diameter of the body. In this way, both the wrap angle can be increased at the individual false twist edges and thereby a higher False twist can be introduced, as well as a greater spatial deflection of the yarn can be achieved, which causes an additional false twist. It is advantageous if the false twist edges each have the same height. However, a spatial deflection of the yarn can also be achieved if the false twist edges have different heights, ie false twist edges are used, which protrude differently far into the interior of the false twist device.

According to a particularly advantageous embodiment, the false twist edges are each offset by a uniform offset angle in the circumferential direction to each other. As a result, a helical deflection at the three or more false twist edges can be produced in a favorable manner and thus the false twist can be introduced into the yarn. The uniform introduction of the false twist in the yarn is supported by the uniform offset angle. If three false twist edges are provided, then the false twist edges are preferably offset by an offset angle of 120 ° with respect to one another.

In principle, however, it is also possible to arrange false twist edges with different offset angles to one another, wherein the false twist edges can have both the same height and a different height.

However, since the Garnauslenkung also by adjacent thread-guiding members, such as the Garnabzugsdüse, a Falschdrallvorrichtung downstream Abzugsröhrchen or another Garnumlenkung is determined, the desired spatial deflection of the yarn can be achieved in the false twist device already with two false twist edges.

According to an advantageous embodiment of the invention, the false twist edges are arranged inclined at an inclination angle of 40 ° to 60 ° to the Garnabzugsrichtung. By such a tilt angle, a particularly high false twist can be generated.

According to a further advantageous embodiment, the false twist edges are designed as insertable into the body of the false twist device webs. The webs can be glued into a cylindrical or semi-cylindrical body, clipped or attached in any other way.

In addition, there are advantages when the entire false twist device with the tubular body and the false twist edges is designed as insertable into the open-end spinning device and preferably removable again from the open-end spinning device insert. This can in turn be glued into a corresponding housing or in a trigger channel of the open-end spinning device or used and attached in any other way.

It is particularly advantageous if the insert has a plurality of, preferably in the Garnabzugsrichtung successively arranged, preferably cylindrical or semi-cylindrical sections. In this case, a false twist edge is preferably arranged in each of the sections. Such a semi-cylindrical portion of the insert with a false twist edge can be produced in a cost effective manner as a molded part, since it is easily demolded due to its shape. It is also advantageous here that the various sections can also be produced as identical parts, which are then assembled to one another only by the offset angle relative to one another.

It is furthermore advantageous if the sections each have at least one positioning element, by means of which they can be positioned in the circumferential direction by the offset angle relative to an adjacent section. With appropriate arrangement of the positioning elements, the sections can still be advantageously formed as equal parts.

Furthermore, it is advantageous if the insert or the sections of the insert made of ceramic, metal or plastic. For the production of the insert or its sections, it is also advantageous if the insert or its sections are designed as injection molded pieces. This allows a cheaper production of the false twist device.

Particularly in the case of the embodiment of the false twist device comprising a plurality of sections, it is advantageous if the false twist device has a housing which surrounds the insert, preferably likewise a cylindrical or tubular housing. By receiving the individual sections in a tubular housing, these can be arranged interchangeable in a particularly simple manner and be easily replaced when worn.

It is furthermore particularly advantageous if the Garnabzugsdüse and the false twist device have a common, preferably removably arranged in the open-end spinning, housing. The false twist device and the Garnabzugsdüse are executed in this case as a structural unit. An axial fixation of the insert or the sections of the insert can also take place by means of the Garnabzugsdüse and / or by means of the housing. A separate axial attachment of the sections with each other or the sections in the housing can be omitted hereby. The false twist device is arranged in Garnabzugsrichtung preferably directly behind the Garnabzugsdüse.

However, it is also possible that the false twist device has a separate housing or is arranged separately from the Garnabzugsdüse in a trigger channel of the open-end spinning device.

In the case of an open-end spinning device, it is furthermore advantageous if the false-twist device is followed by a take-off tube and / or a further twist element. As a result of the further deflection on the downstream swirl element, it can be ensured that the yarn experiences a sufficient wrap angle at each of the successive false twist edges and that a lifting of the yarn from the false twist edge is prevented.

Figur 1

eine Übersichtsdarstellung einer Arbeitsstelle einer Rotorspinnmaschine in einer schematischen Seitenansicht,

Figur 2

eine schematische Schnittdarstellung einer Offenendspinnvorrichtung mit einer Garnabzugsdüse und einer Falschdrallvorrichtung,

Figur 3

eine Prinzipdarstellung der räumlichen Auslenkung des Garns an in Umfangsrichtung zueinander versetzt angeordneten Falschdrallkanten,

Figur 4

eine Ansicht einer als Einsatz ausgebildeten Falschdrallvorrichtung mit mehreren Abschnitten,

Figur 5

eine aus mehreren Abschnitten zusammengesetzte Falschdrallvorrichtung mit einer Garnabzugsdüse in einem gemeinsamen Gehäuse, sowie

Figur 6

eine Detailansicht eines einzelnen Abschnittes einer als Einsatz ausgeführten Falschdrallvorrichtung.

Further advantages of the invention will be described with reference to the embodiments illustrated below. Show it:

FIG. 1

an overview of a workstation of a rotor spinning machine in a schematic side view,

FIG. 2

a schematic sectional view of an open-end spinning device with a Garnabzugsdüse and a false twist device,

FIG. 3

a schematic representation of the spatial deflection of the yarn circumferentially offset from one another arranged false twist edges,

FIG. 4

a view of a formed as a false twist device with several sections,

FIG. 5

a composite of several sections false twist device with a Garnabzugsdüse in a common housing, and

FIG. 6

a detailed view of a single portion of a deployed as false twist device.

FIG. 1 shows a schematic side view of an open-end spinning device 1 of a rotor spinning machine 2. The rotor spinning machine 2 includes a plurality of in the longitudinal direction of the spinning machine 2 juxtaposed jobs. Each workstation usually contains a feed device 8, which supplies the open-end spinning device 1 with a fiber material 6 via a dissolving device 9, which dissolves the fiber material 6 into individual fibers. The fiber material 6 is stored in storage containers 4 on the rotor spinning machine 2. The fiber material 6 dissolved in individual fibers is finally fed to the spinning rotor 3 of the open-end spinning apparatus 1 via a fiber feed channel 5 (see FIG FIG. 2 ). The yarn 7 produced in the spinning rotor 3 is finally drawn off from the open-end spinning apparatus 1 via a draw-off device 10 and wound onto a bobbin 12 by means of a winding device 11.

The open-end spinning apparatus 1 is in the FIG. 2 shown in a schematic, sectional side view. The open-end spinning apparatus 1 comprises a spinning rotor 3, whose rotor cup is arranged in a rotor housing 13. The rotor housing 13 is usually acted upon by spinning vacuum and closed by a removable cover 14. Between the rotor housing 13 and the cover 14, a seal 15 is provided to maintain the pressure prevailing in the rotor housing 13 spinning negative pressure. In the lid 14 is still the already to FIG. 1 described Fiber feed channel 5 arranged on the one hand with the opening device 9 is in communication and the other end projects into the spinning rotor 3 in order to be able to feed the fiber material 6 to the inner wall of the spinning rotor 3.

For yarn production, the individual fibers fed into the spinning rotor 3 are now transported into the rotor groove of the spinning rotor 3 due to the centrifugal force. There they get in contact with a circulating yarn leg 7a of the already produced yarn 7 and are incorporated into the yarn end 7a due to the rotation of the spinning rotor 3. In order to improve the incorporation of the fibers, it has proven to be advantageous if the yarn twist in the rotating yarn leg 7a located between the yarn draw-off nozzle 16 and the rotor groove is increased by means of a false twist device 17. The yarn 7 produced in the spinning rotor 3 is finally drawn off through the take-off device 10 via a yarn withdrawal nozzle 16 likewise arranged in the cover 14 and via the false twist device 17 arranged downstream of the yarn withdrawal nozzle 16. According to the present illustration, a withdrawal tube 18 is further arranged after the false twist device 17, which further Falschdrallkanten 19 contains. However, this is not essential. Likewise, the yarn 7 can be fed directly after its exit from the false twist device 17 without further deflection and without passing another swirl element of the trigger device 10.

In conventional false twist devices 17, the yarn 7 is pulled over a plurality of false twist edges 19 arranged one behind the other in the yarn withdrawal direction G. In this case, the rotations of the yarn 7 are pushed back over the Garnabzugsdüse 16 back into the circumferential yarn leg 7a and up to the rotor groove by the flattening of the yarn cross section at the false twist edges.

In the case of the present false twist device 17, it is now provided that the false twist edges 19 are arranged not only in the yarn withdrawal direction G one behind the other, but at the same time offset in the circumferential direction in the body 20 of the false twist device 17 are arranged. In this way, a spatial deflection of the yarn 7 can be achieved, which in addition to the rotation displacement by the false twist edges 19 gives the yarn a further rotation, which in turn is propagated as a false twist in the region of the rotor groove.

FIG. 3 shows such a false twist device 17 in a schematic representation. The regular Garnabzugsrichtung G is in FIG. 3 represented by a dash-dotted line. In the present false twist device 17, the false twist edges 19 are offset not only in Garnabzugsrichtung G successively, but at the same time in the circumferential direction of the false twist device 17 and the body 20 of the false twist device 17 offset in the body 20 and protrude into the garnführenden inner cross section or interior 21st the false twist device 17, so that the yarn 7 undergoes a spatial deflection relative to the regular Garnabzugsrichtung G. The yarn path of the deflected yarn 7 is shown by a dotted line.

It can be seen that the yarn 7 is deflected at each of the false twist edges 19 by an amount e of the regular Garnabzugsrichtung G. Due to the helical staircase-like arrangement of the false twist edges 19, the yarn 7 experiences a helical deflection, which imposes an additional torque on the yarn 7. It is particularly advantageous if, as shown here, the false twist edges 19 are offset from one another in the circumferential direction by a uniform offset angle. Thus, for example, in the case of three false twist edges 19, as shown in the present case, the false twist edges 19 are rotated by 120 ° relative to one another his. However, it is not absolutely necessary to distribute false twist edges 19 to exactly 360 ° of the circumferential direction. The desired spatial deflection of the yarn 7 can also be achieved with several false twist edges 19 or fewer false twist edges 19, wherein it is not absolutely necessary, the false twist edges 19 at regular intervals with respect to the Garnabzugsrichtung G or with regular offset angles with respect to the To arrange circumferential direction. The resulting by the arrangement of false twist edges 19 spatial deflection or helix of the yarn 7 can be oriented both to the right and to the left with respect to Garnabzugsrichtung G. With Z-wire in the yarn, the helix is clockwise in the yarn withdrawal direction.

FIG. 4 shows a first embodiment of a false twist device 17, which is designed as an existing of several sections 22 insert 23. The false twist device 17 or the insert 23 in the present case consists of three substantially semi-cylindrical sections 22, wherein in each of the sections 22 a false twist edge 19 is arranged. The false twist edges 19 preferably have an angle α of 40 ° to 60 ° to the Garnabzugsrichtung G. By this inclination of the false twist edges 19, in turn, the injectable false twist can be further increased. The individual sections 22 are now each rotated by an offset angle to each other and in the Garnabzugsrichtung G in succession to the insert 23 composed. Advantageously, one or more cams 24 are arranged on each of the sections 22, which in turn interact with corresponding recesses 25 of adjacent sections 22. The cams 24 and the recesses 25 thus form positioning elements, by means of which the individual sections 22 can be positioned relative to one another in the circumferential direction. The individual sections 22 of the false twist device 17 are thereby connected in a form-fitting manner in the circumferential direction and secured against rotation.

FIG. 6 shows a detailed view of such a single section 22 with a false twist edge 19. Like the FIG. 6 can be removed, due to the shape as a semi-cylindrical shell with the false twist edge 19 disposed therein, such a portion 22 in a favorable manner as an injection molded piece produced because the shape allows easy removal from the mold.

Such a false twisting device 17 constructed from individual sections 22 preferably also has a housing 26 surrounding the insert 23 or the individual sections 22 of the insert 23. It can be provided to insert the insert 23 with its surrounding housing 26 in the open-end spinning device. However, it is also conceivable, the insert 23 and the individual portions 22 of the insert 23 directly into a flue channel of the open-end spinning device 1, for example, in the cover member 14 (see FIG. 2 ) can be designed to use.

After another execution (see FIG. 5 ), however, the false twist device 17 and the Garnabzugsdüse 16 are arranged in a common housing 26. The false twist device 17 is thus arranged downstream of the Garnabzugsdüse 16 in this case, so that the torque generated by the false twist device 17 acts directly supporting a already generated by the Garnabzugsdüse 16 false twist. In this case, the individual sections 22 of the insert 23 may additionally be fastened to one another, for example glued together. However, if a housing 26 surrounding the individual sections 22 is provided, this is not absolutely necessary, since a fixation of both the individual sections 22 and a one-piece insert 23 can also take place by means of the housing and / or by means of the Garnabzugsdüse 16, to which the insert 23 can be supported in the yarn withdrawal direction G.

Again FIG. 5 Removable, while the false twist edges 19 have a height H, which is greater than half the inner diameter of the body I 20, so that in this way a good spatial deflection of the yarn 7 can be generated. Such a unit comprising a Garnabzugsdüse 16 and a false twist device 17 can be easily removed from the open-end spinning device 1 and the Garnabzugsdüse 16 and the false twist edges 19 and the insert 23 can be easily replaced.

Deviating from the in the FIGS. 4 to 6 However, it is also possible to produce only the false twist edges 19 as webs and to insert into the body 20 of the false twist device 17, for example gluing or clipping.

The invention is not limited to the illustrated embodiments. Thus, in particular instead of an insert 23 made up of several sections 22, one-piece inserts 23 may also be provided. Likewise, the false twist device 17 could have a cylindrical body 20, in whose cylindrical surface formed as webs or pins formed as false twist edges 19 from the side. Furthermore, it is not absolutely necessary, the false twist device 17, such as in the Figures 2 and 5 shown coaxially with Garnabzugsdüse 16 and directly downstream of Garnabzugsdüse 16 to arrange. The false twist device 17 may also be provided at an angle to the Garnabzugsdüse 16. Furthermore, numerous variations are possible with respect to the number and arrangement of the false twist edges 19 within the false twist device 17. Thus, for example, more than three false twist edges 19 may be provided in the false twist device 17, and the false twist device 17 may further comprise a Have inlet area or outlet area, which represents a further yarn deflection. Further modifications and combinations within the scope of the claims also fall under the invention.

LIST OF REFERENCE NUMBERS

1

open-end

2

Rotor spinning machine

3

spinning rotor

4

reservoir

5

Fiber feeding channel

6

fiber material

7

yarn
7a rotating yarn leg

8th

feeder

9

dissolver

10

off device

11

spooling device

12

Kitchen sink

13

rotor housing

14

Cover of the rotor housing

15

Seal of the rotor housing

16

Garnabzugsdüse

17

False twister

18

draw-off tube

19

False twist edge

20

corpus

21

inner space

22

section

23

commitment

24

cam

25

recesses

26

casing

α

Inclination angle of the false twist edges

e

Deflection of the yarn at the false twist edge

G

yarn draw

H

Height of false twist edges

I

Inner diameter of the body

Claims (14)

1. False twist device (17) for an open-end spinning device (1) to introduce a false twist in a yarn (7) produced in an open-end spinning device (1), wherein the false twist device (17) has a largely tubular corpus (20) and several false twist edges (19) arranged behind one another in yarn draw-off direction (G), inclined by an angle (α) in the corpus (20) with regard to the yarn draw-off direction (G), wherein the several false twist edges (19) protrude in such a way into the interior of the tubular corpus (20) that the yarn (7) on each one of the false twist edges (19) experiences a deflection, wherein the false twist device (17) has at least three false twist edges (19) characterized in that the at least three false twist edges (19) are arranged offset in such a way in circumferential direction in the corpus (20), that the yarn experiences a spatial, helical deflection simultaneously compared to its regular yarn draw-off direction (G) through the successive deflections on the at least three false twist edges (19).
2. False twist device according to the preceding claim, characterized in that the false twist edges (19) have a height (H) greater than one-half of the inner diameter (I) of the corpus (20).
3. False twist device according to one of the preceding claims, characterized in that the several false twist edges (19) are arranged offset, in each case uniformly, around an offset angle in circumferential direction, particularly offset to one another in each case by an offset angle of 120°.
4. False twist device according to one of the preceding claims, characterized in that the false twist edges (19) are executed as webs that can be inserted in the corpus (20) of the false twist device (17).
5. False twist device according to one of the preceding claims, characterized in that the false twist device (17) is executed as a preferably detachable insert (23) that can be inserted in the open-end spinning device (1).
6. False twist device according to the preceding claim, characterized in that the insert (23) has several, preferably cylindrical or semi-cylindrical sections (22), arranged behind one another in yarn draw-off direction (G), wherein one of the several false twist edges (19) is preferably arranged in each section (22).
7. False twist device according to the preceding claim, characterized in that the sections (22) have in each case at least one positioning element (24, 25) used so that the sections can be positioned in circumferential direction by the offset angle compared to a contiguous section (22).
8. False twist device according to one of the preceding claims 5 or 6, characterized in that the insert (23) or the sections (22) of the insert (23) are made of ceramic, metal or plastic, and preferably executed as injection molded parts.
9. False twist device according to one of the preceding claims 5 to 8, characterized in that the false twist device (17) has a housing (26) that surrounds the insert (23).
10. Open-end spinning device (1) of a rotor spinning machine (2) with a yarn draw-off nozzle (16) and with a false twist device (17) arranged downstream from the yarn draw-off nozzle (16) in yarn draw-off direction (G) according to one of the preceding claims.
11. Open-end spinning device according to the preceding claim, characterized in that the false twist device (17) is arranged in yarn draw-off direction (G) directly behind the yarn draw-off nozzle (16).
12. Open-end spinning device according to one of the preceding claims 10 to 11, characterized in that the yarn draw-off nozzle (16) and the false twist device (17) have a common, preferably detachable, housing (26) arranged in the open-end spinning device (1).
13. Open-end spinning device according to one of the preceding claims 10 to 12, characterized in that a draw-off tube (18) and/or an additional twist element is/are arranged downstream from the false twist device (17).
14. Method for introducing a false twist in a yarn (7) produced in an open-end spinning device (1) of a rotor spinning machine (2), in which the yarn (7) is drawn off through a yarn draw-off nozzle (16) and pulled over false twist edges (19) in a false twist device (17) arranged downstream from the yarn draw-off nozzle (16), as a result of which a false twist is introduced to the yarn (7), characterized in that the false twist device (17) has at least three false twist edges (19) arranged offset in circumferential direction of the false twist device (17) and the yarn (7) is exposed to a spatial, especially helical, deflection compared to its regular yarn draw-off direction (G) through the at least three false twist edges (19), wherein an additional false twist is imparted to the yarn (7).

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