EP1092796A1 - Apparatus for interlacing multifilament yarns - Google Patents

Abstract

An interlacing unit has compressed air fed through a convergent-divergent nozzle (5', 5) to a yarn duct (3). The central section (3) of the duct near the compressed air nozzle entry is of wider cross-section than the entry and exit sections (3', 3'). The contour of the wider section can be in the form of a hemisphere (4) with a flat cover plate (1).

Description

The invention relates to a device for interlacing multifilament yarns a swirling unit, which has a thread channel and at least one in has the thread channel opening blow channel, and with a compressed air supply to Blow channel, each blow channel having a cross section widening towards the thread channel having.

Such a device is known for example from WO 82/00668. The well-known Device has a thread channel, which is generally constant in cross section having. In special cases, the cross section of the thread channel can extend over it Change length continuously or gradually. It can also be narrowed and / or local Have extensions. The blow channel of this known device is said to Have the shape of a Laval nozzle.

The interlacing of multifilament yarns is important because of the Whirling the cohesion of the filaments with each other is promoted and thus fewer disturbances in the further processing of the multifilament yarns Thread leading organs appear through protruding filaments. This applies in same dimensions for plain yarns as for textured yarns. As a measure of the assessment interlaced yarns become the fixed points per meter Yarn or the average and maximum opening length - the length between two consecutive swirl points, also swirl nodes called, - determined. However, the yarns are processed further due to the stress on the yarns, for example when weaving, part of the Swirling knot removed again, so that the middle and maximum opening length increase and the fixed points per meter of yarn decrease.

The object of the present invention is to provide a device for swirling To provide multifilament yarns of the type mentioned, with their Help multifilament yarns can be interlaced in such a way that the stability of the interlacing properties these yarns as little as possible during their further processing is changed.

This object is achieved by a device for interlacing multifilament yarns with a swirling unit, which has a thread channel and at least has a blowing duct opening into the thread duct, and with a compressed air supply to the blowing channel, with each blowing channel widening towards the thread channel Has cross section, the thread channel for each blowing channel before the confluence of the air duct, the first section, one in the area the mouth of the blowing channel and a second section after the Junction of the blowing channel lying third section, the second Section of the thread channel perpendicular to the axis of the thread channel larger cross-sectional areas than the cross-sectional areas of the first and third Section.

In particular, the second section has a width which extends from the confluence of the blowing channel into the thread channel towards one of the confluence opposite wall of the thread channel enlarged at least in sections.

It has also proven to be useful if the second section has a length has, which is from the confluence of the blowing channel in the thread channel in Direction of a wall of the thread channel opposite the junction enlarged at least in sections.

The extension in length and / or width may vary from the confluence of the First enlarge the blow channel away and then change to a constant dimension. But it can also over the entire second section of the thread channel extend to the wall opposite the blow duct, then it It is particularly advantageous if the increase in length and / or width is constant he follows.

With these measures, a swirling aggregate is made available at which is the section of the intermingling unit in which the blowing channel in the Fadenkanal opens, has a significant expansion of the thread channel in such a way that the thread channel in this section has a significantly greater width than the width of the rest in front of and behind the mouth of the blow channel Thread channel sections, and that the thread channel in this section of its Reason at least in sections towards the opposite wall the thread channel is also expanding. This is under the width of the thread channel understood the cross-sectional dimension, perpendicular to the thread channel axis and is arranged perpendicular to the blowing channel axis, and under the length of the thread channel understood the cross-sectional dimension that is parallel to the thread channel axis is arranged. The wall of the thread channel becomes the bottom of the thread channel understood that on the side of the thread channel parallel to the thread channel axis runs in which wall the mouth of the blow duct lies.

Surprisingly, it turns out that this measure means a high level with little energy Fixed point density with high uniformity in those with the device according to the invention treated yarns can be produced. In many cases, the Whirling takes place at a higher processing speed than when used of conventional devices for interlacing multifilament yarns. In addition, the swirling points show a significantly better stability, that means that the properties measured to assess the intermingled yarn even after these yarns have been subjected to further processing change significantly less than when swirling with conventional devices is possible.

In the device according to the invention, it has proven particularly useful if the length and the width of the second section perpendicular to the thread channel axis enlarge the size of the mouth of the blow channel.

Especially in devices where the blow channel is at an angle of less than 90 ° opens into the thread channel, it is advantageous if the length and the width of the second section concentric to the axis of the blowing duct from the Enlarge the mouth of the blow duct.

In the device according to the invention, it has proven to be particularly advantageous if the contour of the thread channel of the second section is at least in Direction of width is U-shaped. It is also possible that the Legs of the U are bent outwards and thus the contour of the second Section of the thread channel at least in the direction of the width of a parabola has the apex interrupted by the mouth of the blow duct is.

The contour of the thread channel of the second section preferably has the shape of a Ball cap, which is interrupted by the mouth of the blow duct. The term spherical cap means the partial surface of a sphere, which by cutting off part of the spherical surface over a flat cut was created, the distance of the flat section from the most distant point of the Spherical surface corresponds to a maximum of half the diameter of the spherical surface. Is the distance of the plane section from the most distant point on the surface of the sphere just equal to half the diameter of the spherical surface, it is the Surface of a hemisphere.

The device according to the invention is also characterized in that the largest Width of the second section of the thread channel is 1.5 to 3 times as wide as that average width of the first and third sections of the thread channel.

Particularly good results are achieved when the mouth of the blow duct opposite wall of the second section of the thread channel even is formed and the axis of the blowing channel is aligned perpendicular to this wall is. With such a device there is a particularly intensive swirling the filaments of a multifilament yarn. If the junction is level of the blowing duct opposite wall and at the same time concentric Formation of the thread channel extension in the second section of the thread channel it is achieved that the air coming from the blow duct perpendicular to the as Impacting flat wall impacts, causing a vortex flow in Form of two counter-rotating tell streams of the same size emerges. On in this way a particularly intensive intermingling of the filaments of the multifilament yarn reached.

It has proven to be an advantage if the mouth of the blow channel Opposite wall of all sections of the thread channel are flat are.

The device according to the invention is also characterized in that the axis of the blowing channel with the axis of the thread channel an angle α between 90 ° and 30 ° form. It is recommended that this angle is 90 ° for plain yarns. If an angle of less than 90 ° is selected for plain yarns, the multifilament yarn should are preferably guided through the swirling unit in this way, that the blowing angle of the thread running direction is arranged inclined in the opposite direction. Should textured multifilament yarns are swirled, an angle of less than 90 ° preferred, the direction of the blowing channel being particularly preferably selected in this way is that the blowing air in the thread running direction in the second section of the thread channel entry.

The cross-sectional expansion of the blow duct can take the form of a truncated cone have, the blowing channel in the direction of the thread channel preferably initially one Has cross-sectional reduction that after a narrowest cross-section in the Cross-sectional expansion passes.

However, the blow channel particularly preferably has the shape of a Laval nozzle.

Particularly good flow conditions result in the device according to the invention, if the cross section of the blowing duct at the junction in the Fadenkanal has an area that is 1.2 to 3 times as large as the area of the narrowest cross section of the blowing channel.

As a rule, the thread channel has a constant in the first and third sections Cross section on. It may be appropriate here for the thread channel to be on the entry side in the intermingling unit initially has a larger cross section, which then tapers to the actual thread channel cross-section. Just like that the thread channel on the outlet side of the intermingling unit can be expanded be trained. It can also be useful to have the cross section of the thread channel to be made smaller or larger in the first section than the cross section of the third section. In the interlacing of textured multifilament yarns the thread channel cross section is preferably smaller on average in the first section than in the third or last section. But it can also be useful be when the first section of the thread channel is a steady cross-sectional expansion which continues in the third section. With the just described Embodiments, however, it is essential that the thread channel cross section in second section is definitely larger than in the first and third Section.

If the swirling unit contains at least two blowing channels, the Device according to the invention in particular that the third section of the thread channel with respect to a previous blowing channel, the first section of the thread channel with respect to a subsequent blowing channel. Here it has Particularly proven when the first and third sections of the thread channel are the same Have length. In the case of at least two blowing channels, this means that the Length of the thread channel on the entry side of the intermingling unit, the lengths of the thread channel between two adjacent mouths of blowing channels and the length of the thread channel on the exit side of the intermingling unit have the same length.

In principle, the swirling unit contained in the device according to the invention can be formed in one piece or produced in two or more parts and after its production again to a part, possibly insoluble, put together his. In such embodiments, it is recommended that in the swirling unit there is a slit on the side that extends to the thread channel, Through which slot the multifilament yarn can be inserted and removed. In this case, the device according to the invention is characterized in that the swirling unit from a first part and a second part is composed and along the long side of the swirling unit Thread insertion slot is arranged. Here, the first and the second part of the swirling unit be designed such that the Thread insertion slot between the first and second part of the interlacing unit is arranged.

However, the swirling unit is preferably designed in two parts. Hereby the introduction of the multifilament yarn into the thread channel is facilitated because this can be done simply by opening the two-part swirling unit.

The thread channel has in the first and third sections the shape of a groove, the open one Side is bounded by a flat wall, and the confluence of the Blow channel in the second section is preferably in the plane of the groove bottom of the first and the third section of the thread channel. The is preferred Cross-section of the groove of the thread channel U-shaped.

To simplify production, the swirling unit is designed in two parts, that a first part has the blow channel and the groove and the second part is a flat plate with which the groove can be covered.

To simplify the insertion or removal of the multifilament yarn to be interlaced the swirling unit consists of a first part and a second part, the thread channel by moving or twisting the first and / or second part for inserting or removing the multifilament thread in an open position and for swirling the multifilament thread in a closed Position can be transferred.

The invention is explained in more detail with reference to the following figures.

Figur 1a

den schematischen Aufbau eines erfindungsgemäßen Verwirbelungsaggregats mit einem senkrecht angeordneten Blaskanal, wobei der zweite Abschnitt des Fadenkanals die Kontur einer Kugelkappe aufweist,

Figur 1b

Schnitt AA des Verwirbelungsaggregats gemäß Figur 1a,

Figur 2a

den schematischen Aufbau eines erfindungsgemäßen Verwirbelungsaggregats mit einem schräg angeordneten Blaskanal, wobei der zweite Abschnitt des Fadenkanals die Kontur einer Kugelkappe aufweist,

Figur 2b

Schnitt AA des Verwirbelungsaggregats gemäß Figur 2a,

Figur 3a

den schematischen Aufbau eines erfindungsgemäßen Verwirbelungsaggregats mit einem senkrecht angeordneten Blaskanal, wobei im zweiten Abschnitt des Fadenkanals jede Kontur U - förmigen Querschnitt aufweist,

Figur 3b

Schnitt AA des Verwirbelungsaggregats gemäß Figur 3a,

Figur 4a

den schematischen Aufbau eines erfindungsgemäßen Verwirbelungsaggregats mit einem schräg angeordneten Blaskanal, wobei im zweiten Abschnitt des Fadenkanals jede Kontur U - förmigen Querschnitt aufweist,

Figur 4b

Schnitt AA des Verwirbelungsaggregats gemäß Figur 4a,

Figur 5

den schematischen Aufbau eines erfindungsgemäßen Verwirbelungsaggregats in zweigeteilter Ausführungsform, in geöffnetem Zustand,

Figur 6

den schematischen Aufbau einer geschlossenen Bauform eines erfindungsgemäßen Verwirbelungsaggregats mit Fadeneinlegeschlitz,

Figur 7a

einen Querschnitt durch eine erfindungsgemäße Vorrichtung in zweiteiliger Ausbildung in geschlossenem Zustand,

Figur 7b

einen Querschnitt durch eine erfindungsgemäße Vorrichtung in zweiteiliger Ausbildung in geöffnetem Zustand,

Figur 8

einen Querschnitt durch eine erfindungsgemäße Vorrichtung in einteiliger Ausbildung

Figur 9a

einen Querschnitt durch eine weitere erfindungsgemäße Vorrichtung in zweiteiliger Ausführung und in geschlossenem Zustand,

Figur 9b

die Vorrichtung gemäß Figur 9a in geöffnetem Zustand,

Figur 9c

die Vorrichtung gemäß Figur 9a in Draufsicht

Figur 9d

die Vorrichtung gemäß Figur 9b in Draufsicht

Figur 9e

Schnitt CC der Vorrichtung gemäß Figur 9a

Figur 9f

Schnitt DD der Vorrichtung gemäß Figur 9b

Show it:

Figure 1a

the schematic structure of a swirling unit according to the invention with a vertically arranged blowing channel, the second section of the thread channel having the contour of a spherical cap,

Figure 1b

Section AA of the swirling unit according to FIG. 1a,

Figure 2a

the schematic structure of a swirling unit according to the invention with an obliquely arranged blowing channel, the second section of the thread channel having the contour of a spherical cap,

Figure 2b

Section AA of the swirling unit according to FIG. 2a,

Figure 3a

the schematic structure of a swirling unit according to the invention with a vertically arranged blowing channel, each contour having a U-shaped cross section in the second section of the thread channel,

Figure 3b

Section AA of the swirling unit according to FIG. 3a,

Figure 4a

the schematic structure of a swirling unit according to the invention with an obliquely arranged blowing channel, each contour having a U-shaped cross section in the second section of the thread channel,

Figure 4b

Section AA of the swirling unit according to FIG. 4a,

Figure 5

the schematic structure of a swirling unit according to the invention in two-part embodiment, in the open state,

Figure 6

the schematic structure of a closed design of a swirling unit according to the invention with thread insertion slot,

Figure 7a

2 shows a cross section through a device according to the invention in a two-part design in the closed state,

Figure 7b

2 shows a cross section through a device according to the invention in a two-part design in the open state,

Figure 8

a cross section through an inventive device in one piece

Figure 9a

3 shows a cross section through a further device according to the invention in a two-part design and in the closed state,

Figure 9b

9a in the open state,

Figure 9c

the device according to Figure 9a in plan view

Figure 9d

the device of Figure 9b in plan view

Figure 9e

Section CC of the device according to Figure 9a

Figure 9f

Section DD of the device according to FIG. 9b

According to FIG. 1 a as well as according to FIG. 2 a is a diagram according to the invention Swirling unit shown in side view. The swirling unit receiving device and a compressed air supply to a blow duct are in the Figures 1 to 6 not shown for clarity. The swirling unit consists of an upper part 1, which in the case shown is a flat plate represents and a lower part 2, which has a thread channel 3. As from a figure 1b and 2b, which shows the section AA from FIGS. 1a and 2a, the thread channel 3 has a first section 3 ', a second section 3' 'and a third section 3 '' '. Furthermore, the swirling unit has one Blow channel 5 ', 5' 'or 6', 6 '', which is initially one in the direction of the thread channel 3 Cross-sectional reduction 5 'or 6' and then a cross-sectional expansion 5 '' or 6 ''.

The parts of the second section arranged in the interior of the swirling unit 3 '' of the thread channel 3 and the blowing channel 5 ', 5' 'are in the side view (Figure 1a) or the blow channel 6 ', 6' '(Figure 2a) shown with dashed lines. Thus, a contour 4 shown in dashed lines in FIGS. 1a and 2a represents the width of the second section 3 ″ of the thread channel 3 and a contour 4 according to FIGS. 1b and 2b the length of the second section 3 ″ of the thread channel 3. The contour of the second Section 3 ″ of the thread channel 3 has the contour of a hemisphere, whereby Increase the length and width of the contour 4 away from the blow duct 5 '' or 6 ''.

The swirling unit shown in FIGS. 1a, 1b has a blow channel 5 ', 5' ', the axis of which is perpendicular to the longitudinal extension of the thread channel 3 and arranged perpendicular to a surface of the upper part 1 of the swirling unit is, while that in the swirling unit shown in Figures 2a, 2b has a blow duct 6 ', 6' ', the axis of which is at an angle α of less than 90 ° to the longitudinal extension of the thread channel 3 and perpendicular to a surface the upper part 1 of the swirling unit is arranged.

According to FIG. 3a and also according to FIG. 4a, an inventive method is shown schematically Swirling unit shown in side view. The swirling aggregate exists from an upper part 1, which in the case shown represents a flat plate and a lower part 2, which has a thread channel 3. As from Figure 3b or 4b, which shows the section AA from FIGS. 3a and 4a, the Thread channel 3 a first section 3 ', a second section 3' 'and a third Section 3 '' on. Furthermore, the swirling unit has a blowing duct 5 ', 5 '' or 6 '6' ', softer towards the thread channel 3, first a reduction in cross-section 5 'or 6' and then a cross-sectional expansion 5 '' or 6 ''.

The parts of the second section arranged in the interior of the swirling unit 3 '' of the thread channel 3 and the blowing channel 5 ', 5' 'are in the side view (Figure 3a) and the blow channel 6 ', 6' '(Figure 4a) shown with dashed lines. Thus, a contour 7 shown in dashed lines in FIGS. 3a and 4a represents the width of the second section 3 ″ of the thread channel 3 and a contour 7 according to FIGS. 3b and 4b the length of the second section 3 ″ of the thread channel 3. The contour of the second Section 3 ″ of the thread channel 3 has the shape of a U, with length and Increase the width of the contour 7 away from the blow channel 5 '' or 6 ''.

The swirling unit shown in FIGS. 3a, 3b has a blow channel 5 ', 5' ', the axis of which is perpendicular to the longitudinal extension of the thread channel 3 and arranged perpendicular to a surface of the upper part 1 of the swirling unit is, while that in the swirling unit shown in Figure 4a, 4b has a blow duct 6 ', 6' ', the axis of which is at an angle α of less than 90 ° to the longitudinal extension of the thread channel 3 and perpendicular to a surface the upper part 1 of the swirling unit is arranged.

FIG. 5 shows a possible embodiment of the swirling unit according to the invention shown, which is formed in two parts and for insertion or can be opened to remove a multifilament yarn. In the illustrated The embodiment is an upper part 1 of the swirling unit according to the invention pushed backward around a multifilament yarn in the thread channel (not inserts) of the lower part 2 of the swirling unit to be able to. To operate the swirling unit according to the invention the upper part 1 of the swirling unit is then in a closed position, as shown in Figure 1a, pushed. Such devices, which were used to open or close texturing nozzles, are known for example from WO 97/11214.

In Figure 6, a one-piece swirling unit is shown. For easier production an upper part 8 and a lower part 9 are also first produced, the two parts 8 and 9 then releasable, for example by Screw or unsolvable, for example by riveting or gluing get connected. To insert or remove the multifilament thread can, this interlacing unit has a thread insertion slot 10, the runs along the long side of the swirling unit and over the whole Length runs through to the thread channel.

FIG. 6 also shows that the thread channel is not only in principle lower part 9 of the swirling unit must be arranged, but parts of the Thread channel can also be incorporated in the upper part 8 of the intermingling unit can. In the case shown, both the thread channel 11 and the expanded one Thread channel 12 of the second section of the thread channel partially in the lower part 9 and partially incorporated into the upper part 8 of the swirling unit. The Blow channel is designated in FIG. 6 with 5 ', 5' 'in accordance with the previous figures. Although a thread channel divided in this way is only for a one-piece one Embodiment of the swirling unit according to the invention is shown can this type of arrangement also in the previously described embodiments be used.

7a, 7b is a cross section through a device according to the invention in FIG two-part training and in the closed state (Figure 7a) and in the open State (Figure 7b) shown. In a holder 13 is an inventive Swirling unit used with the upper part 1 and the lower part 2. The Lower part 2 is connected to the holder 13 by means of screws 16. The blow duct 5 ', 5' ' can be supplied with compressed air via the compressed air connection 19. Via a lever 15 can the upper part 1 in a closed position (Figure 7a) and in a open position (Figure 7b) can be moved. The upper part 1 is a Holding plate 14, which is connected via screws 17 to the holder 13, and a Spring 18 held.

FIG. 8 shows a cross section through a device according to the invention in FIG one-piece training. The lower part 9 is with a holder 20 via screws 22 connected. The upper part 8 is also with the holder 20 via screws 23 and the lower part 9 connected, the upper part 8 and / or the lower part 9 being shaped in this way is / are that after assembly between upper part 8 and lower part 9 a Thread insertion slot 10 remains. Here too, the connection 21 can be used Blow duct 5 ', 5' 'can be supplied with compressed air.

FIGS. 9c and 9d show a further embodiment of the invention Device in two parts in the closed state (Figure 9c) and in opened state (Figure 9d) each shown in plan view. To this Embodiment are in Figures 9a and 9b noted in Figures 9c and 9d Cross sections shown, wherein Figure 9a is a section AA (Figure 9c) and Figure 9b Section BB (Figure 9d) is.

In a base plate 24 is the lower part 2 of a swirling unit according to the invention used. The upper part 1 is by means of a compression spring 25 and one Screw 26 inserted into a holder 27, which by means of screw 33 with the Base plate 24 is connected, whereby upper part 1 and lower part 2 of the device according to the invention are held together.

In the holder 27 a rotary body 28 is also used, which with a lever 30 A screw 31 is connected. In the rotating body 28 is a resilient Thrust piece 32 screwed, which in a recess 37 in the closed State or in a recess 38 in the open state.

Via the lever 30, the device according to the invention can be closed or transferred to the open state. For the better Understanding of the mechanism used for this is the section in FIG. 9e CC according to FIG. 9a and FIG. 9f the section DD according to FIG. 9b. A pin 29 anchored in the rotating body 28 engages in an elongated hole 34 in the lower part 2. By turning the lever 30, the lower part 2 is in the closed via the pin 29 Position (Figure 9e) or in the open position (Figure 9 f), where each in the end position, the pressure piece 32 into the recess 37 or 38 snaps into place

In the open position (FIGS. 9b, 9d, 9f) it is via a compressed air supply 35 supplied compressed air shut off by means of sealing ring 36 and the multifilament yarn can be inserted or removed. By turning the lever 30 back Device closed again (Figures 9a, 9c, 9e) and the blow channel 5 ', 5' 'with Compressed air supplied, this position in turn by snapping the resilient Pressure piece is fixed in the recess 37 in the lower part 2.

In FIG. 9c, 9d (top view) there is additionally a thread guide 39 via screws 40 connected to the lower part 2 such that the thread guide when opening and Closing the device is moved laterally, thereby handling the Device is made considerably easier.

The invention is also explained in more detail with reference to the following examples.

Comparative example

A known swirling unit was first used, as described for example in WO 82/00668. The selected interlacing unit has a thread channel with a constant, U-shaped cross section with a length of 15 mm, the height of which was 2 mm and the width of which was 2 mm. At the apex of the thread channel, a blowing channel opens in the middle of the thread channel, which has the shape of a Laval nozzle, a cross-sectional area of 1.54 mm ² at the narrowest point, a cross-sectional area of 2.1 mm ² and had a length of 5 mm. The wall of the thread channel opposite the junction was flat. The axis of the blowing channel formed an angle of 80 ° on the thread inlet side with the axis of the thread channel.

Two textured filament yarns were placed in such a interlacing unit 36 filaments each, each of these filaments having a single titre of 4.7 dtex exhibited. The yarn was swirled at a speed of 700 m / min through the swirling unit, the required Compressed air at a pressure of 4.5 bar was fed to the blow duct.

The fixed points per meter, the average opening length, the standard deviation and the maximum opening length were determined on the swirled yarn in this way. In order to simulate the stress on this intermingled yarn, the intermingled yarn was stretched by 2%, 2.3%, 2.6% or 3.5% of its original length and the values just mentioned were measured again. The measured values are summarized in Table 1 below. Strain [%] 0 2.0 2.3 2.6 3.5 Fixed points per meter 102 96 89 63 20th average opening length [cm] 0.98 1.04 1.11 1.59 5.0 Standard deviation [cm] 0.34 0.47 0.64 1.87 10.0 maximum opening length [cm] 4.4 6.8 9.6 28 99

example

The nozzle used in the comparative example was modified in such a way that the thread channel was now drilled concentrically with the blow channel axis using a drill which had the shape of a hemisphere with a diameter of 4 mm, down to the base of the thread channel. The yarns and interlacing conditions used were chosen as in the comparative example. The properties measured on the intermingled yarn are listed in Table 2. Strain [%] 0 2.0 2.3 2.6 3.5 Fixed points per meter 102 102 100 98 89 average opening length [cm] 0.98 0.98 1.0 1.02 1.13 Standard deviation [cm] 0.23 0.23 0.28 0.33 0.59 maximum opening length [cm] 3.5 3.5 4.3 5.1 8.7

When comparing the results it can be seen that compared to the state of the Technology for the unloaded yarn, the standard deviation and the maximum opening length was improved. It also becomes clear that with a subsequent Stress, which was simulated here by stretching the yarn, the intermingling quality of the yarn has improved significantly if the interlacing with the help a device according to the invention is carried out.

Claims (25)

Device for interlacing multifilament yarns with a interlacing unit, which has a thread channel (3; 11) and at least one in the thread channel (3; 11) opening blow channel (5 ', 5' '; 6', 6 ''), and with a Compressed air supply to the blow duct (5 ', 5' '; 6', 6 ''), each blow duct (5 ', 5' '; 6', 6 '') has a cross section widening towards the thread channel (3; 11), the thread canate (3; 11) for each blowing canate (5 ', 5' '; 6', 6 '') one in front of the Opening of the blowing channel (5 ', 5' '; 6', 6 '') lying first section (3 '), one second located in the area of the mouth of the blowing channel (5 ', 5' '; 6', 6 '') Section (3 '') and one after the mouth of the blowing channel (5 ', 5' '; 6', 6 '') lying third section (3 '' '), the second section (3' ') of the Larger thread channel perpendicular to the axis of the thread channel Cross-sectional areas has as the cross-sectional areas of the first and the third section. Device according to claim 1, characterized in that the second Section (3 '') has a width which extends from the confluence of the Blow channel (5 ', 5' '; 6', 6 '') into the thread channel (3; 11) towards one of the At least the opposite wall of the thread channel enlarged in sections. Device according to claim 1 or 2, characterized in that the second Section (3 '') has a length which extends from the mouth of the Blow channel (5 ', 5' '; 6', 6 '') into the thread channel (3; 11) towards one of the At least the opposite wall of the thread channel enlarged in sections. Device according to one or more of claims 1 to 3, characterized characterized in that the length and the width of the second section (3 '') perpendicular to the thread channel axis concentric to the mouth of the Enlarge blowing channel (5 ', 5' '; 6', 6 ''). Device according to one or more of claims 1 to 3, characterized characterized in that the length and the width of the second section (3 '') concentric to the axis of the blow channel from the mouth of the blow channel (5 ', 5' '; 6', 6 '') enlarge away. Device according to one or more of claims 1 to 5, characterized characterized in that the contour (7) of the thread channel of the second section (3 '') is at least U-shaped in the width direction. Device according to one or more of claims 1 to 5, characterized characterized in that the contour (4) of the thread channel of the second section (3 '') has the shape of a spherical cap, which through the mouth of the Blow channel (5 ', 5' '; 6', 6 '') is interrupted. Device according to one or more of claims 1 to 7, characterized in that that the greatest width of the second section (3 '') of the thread channel 1.5 to 3 times the width of the average width of the first and third section of the thread channel (3; 11). Device according to one or more of claims 1 to 8, characterized characterized in that the mouth of the blow channel (5 ', 5' '; 6', 6 '') opposite wall of the second section (3 '') of the thread channel (3; 11) is flat and the axis of the blowing duct (5 ', 5' '; 6', 6 '') is vertical is aligned to this wall. Device according to one or more of claims 1 to 9, characterized in that that the opposite of the mouth of the blow duct (5 ', 5' '; 6', 6 '') Wall of all sections of the thread channel (3; 11) flat are. Device according to one or more of claims 1 to 10, characterized in that that the axis of the blowing channel (6 ', 6' ') with the axis of the thread channel (3; 11) form an angle (α) between 90 ° and 30 °. Device according to one or more of claims 1 to 11, characterized in that that the cross-sectional expansion of the blow duct shape of a truncated cone. Device according to one or more of claims 1 to 10, characterized in that that the blowing channel in the direction of the thread channel (3; 11) is initially one Has cross-sectional reduction that after a narrowest cross-section in the Cross-sectional expansion passes. Device according to one or more of claims 1 to 11, characterized in that that the blow channel (5 ', 5' '; 6', 6 '') has the shape of a Laval nozzle having. Device according to one or more of claims 1 to 14, characterized in that that the cross section of the blowing duct (5 ', 5' '; 6', 6 '') at the junction in the thread channel (3; 11) has an area that is 1.2 to 3 times as much is as large as the area of the narrowest cross section of the blowing duct. Device according to one or more of claims 1 to 15, characterized in that that the first section of the thread channel (3; 11) is a continuous one Cross-sectional expansion that continues in the third section. Device according to one or more of claims 1 to 16, characterized in that that the cross section of the first section of the thread channel is on average smaller than the cross section of the third section of the Thread channel. Device according to one or more of claims 1 to 17 with at least two blowing channels, characterized in that the third section of the thread channel with respect to a previous blow channel, the first section of the thread channel with respect to a subsequent blowing channel. Device according to one or more of claims 1 to 18, characterized characterized that the first and third sections of the thread channel have the same length. Device according to one or more of claims 1 to 19, characterized in that that the thread channel (3; 11) in the first and third section Shape of a groove, the open side of which is delimited by a flat wall, has and the mouth of the blow duct (5 ', 5' '; 6', 6 '') in the second section in the plane of the groove bottom of the first and third sections of the Thread channel is arranged. Device according to one or more of claims 1 to 20, characterized in that that the swirling unit is formed in two parts. Device according to claim 21, characterized in that the cross section the groove is U-shaped. Device according to claim 21 or 22, characterized in that the Swirling unit is formed in two parts, a first part (1) Blow channel (5 ', 5' '; 6', 6 '') and the groove and the second part (2) has a flat Is plate with which the groove can be covered. Device according to claim 20 or 23, characterized in that the Swirling unit consisting of a first part (1) and a second part (2) exists, and the thread channel (3; 11) by moving or turning the first and / or second part for inserting or removing the multifilament thread in an open position and for swirling the multifilament thread in a closed position can be transferred. Device according to one or more of claims 1 to 20, characterized characterized in that the swirling unit from a first part (8) and a second part (9) is assembled, and along the long side of the Whirling unit a thread insertion slot (10) is arranged.

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