WO2004042126A1

WO2004042126A1 - Method and device for the production of a sliver

Info

Publication number: WO2004042126A1
Application number: PCT/EP2003/012243
Authority: WO
Inventors: Peter Artzt; Volker Jehle; Sibylle Schmied; Günter Steinbach
Original assignee: Deutsche Institute Für Textil- Und Faserforschung Stuttgart Stiftung Des Öffentlichen Rechts
Priority date: 2002-11-05
Filing date: 2003-11-03
Publication date: 2004-05-21
Also published as: AU2003279347A1; DE50306404D1; EP1560960A1; EP1560960B1; DE10251727A1

Abstract

Disclosed is a sliver which is suitable as a feed to be spun into a filament yarn, e.g. on a ring spinner, and is produced from a drawframe sliver (S) that is drawn in a drawing frame (3) and is then provided with a spin, whereupon said sliver is wound onto a feed bobbin (5). The fiber strand which leaves the drawing frame is provided with a spin in a first pneumatic spinning chamber (1) comprising a passage duct in which air jets act upon the fiber strand so as to create a spin counter to the direction of spinning in the following second pneumatic spinning chamber (2). The inventive method can be carried out by means of a pneumatic spinning device which provides the fiber strand leaving the drawing frame with a spin and a device for receiving the finished fiber sliver, for example. The drawing frame comprises no sliver compactor that is arranged upstream of the drawing frame outlet and combines the fiber strand. A first and a second spinning chamber (1, 2), through which the fiber strand successively runs when leaving the drawing frame and which create opposite spinning effects on the fiber strand, are disposed downstream from the pair of discharge rollers (31) of the drawing frame.

Description

Method and device for producing roving slips

The invention relates to a method for producing a roving sliver which is suitable as a template for spinning into a fiber yarn, for example on a ring spinning machine, with a draw frame being warped in a drafting device and this fiber assembly subsequently being twisted before being applied to a sliver Supply coil is wound, as well as a device with which this method can be carried out.

The flyer sling used as a template for ring spinning machines is usually made from a drawstring which is drawn on a drafting system, usually a double apron drafting system, and then undergoes a slight rotation so that this fuse can be wound onto a solenoid. The rotation given may only be so high that the cohesion of the fiber structure for winding and unwinding as well as the transport of the bobbins is firm enough so that there are no delays. On the other hand, this rotation must be easily resolved when delayed on ring spinning machines not to impede the delay.

The so-called flyer is used as a roving machine to produce the flyer sliver. This pre-spinning machine is equipped with a drafting system and a spindle for winding the flyer sliver onto a solenoid by means of a wing to support the sliver against the centrifugal force caused by the spindle speeds. This flyer is a particularly complicated and expensive machine in the spinning process due to the winding. In addition, the usual performance of a flyer is 20-25 meters per minute. However, this low production cannot be increased with regard to the wind-up system with flyer wings, since a higher speed is limited by the centrifugal force that the wings can withstand.

It has therefore already been attempted to circumvent the flyer by means of so-called direct spinning, in which the template for the ring spinning machine consists of route belt, or by OE spinning. A ring yarn is created on the OE spinning machine not the same yarn, so that the game character is not a substitution of the flyer with the ring spinning process. The high distortion caused by direct belt spinning only partially achieves the result that can be achieved by presenting a flyer on the ring spinning machine, especially if fine yarns Nm 50 and finer are to be spun. In addition, the preparation of draw cans in the ring spinning machine is complex and complicated.

The object of the present invention is to provide a method and a device in which the above-mentioned disadvantages of the conventional pre-spinning process are avoided and nevertheless as a template for the ring spinning machine to create a fiber structure which is refined compared to the draw frame and which fulfills the properties of the conventional flyer sliver.

This object is achieved by the method according to claims 1, 39 and 41 and the device according to device claim 15.

The fact that the fiber structure emerging from the drafting system receives an opposite swirl arrangement by air jets in a first and in a second swirl chamber results in only a slight consolidation of the fiber structure, which is sufficient for winding and transport, but when warping on the ring spinning machine can be easily resolved. With this method the production speed can be increased tenfold. In the first swirl chamber, the air jets are directed in such a way that, in addition to the swirl effect, suction is also exerted on the fiber structure emerging from the drafting system, as a result of which the fiber structure is transferred into the swirl chamber device without any problems and without loss of fiber. The winding in parallel windings ensures a template, as is already common with the ring spinning machine. In order to simplify and reduce the technical complexity, a cross winding is preferably produced. The first swirl chamber exerts a lower torque than the second swirl chamber on the fiber structure, so that the fiber structure receives an excess of rotation through the second swirl chamber into the area between the drafting device output roller pair and the first swirl chamber and edge fibers with an open fiber end can split off. The pressure in the first swirl chamber is preferably kept constant and the pressure in the second swirl chamber is changed to match the delivery speed. At a higher delivery speed The pressure in the second swirl chamber is increased in accordance with the higher delivery speed. The winding is favored by a negative distortion to which the fiber structure passing through the swirl chambers is subjected. It has proven to be advantageous both for the winding as well as for the further spinning of the fuse to exert a tension delay on the finished fuse before the winding in order to stretch the winding fibers.

An extremely productive device is created in a simple manner by the features of claim 15. In order to achieve a spreading of the edge fibers required for the winding around the twisted core of the fiber structure, the usual sliver compressors in the drafting system are dispensed with, so that the fiber structure can spread sufficiently to form edge fibers. It is essential that a certain distance is maintained between the clamping line of the pair of output rollers and the entrance to the first swirl chamber. The design of the swirl chambers with bores opening tangentially into the through-channel for the fiber structure results in a good swirl effect without the use of rotating parts. It is therefore possible to achieve very high delivery speeds that were previously unknown in roving production. Characterized in that the bores in the first swirl chamber have an angle of inclination with respect to the axis of the through-channel, a suction effect is generated in the direction of the input side of the through-channel, which ensures a good transfer of the fiber structure from the drafting device into the swirl chamber. The same can also be advantageous for the second swirl chamber. The offset of the through-channel of the first swirl chamber transversely to the clamping line of the pair of output rollers results in a kind of swirl stop, so that the spinning triangle is not combined too strongly and the generation of stray edge fibers for winding around the fiber structure is favorably influenced. The speed of the pair of delivery rollers can be adjusted to achieve a specific spinning delay. It has proven to be extremely advantageous to arrange a further pair of rollers after the pair of delivery rollers so as to exert a tension delay on the finished sliver to stretch the wrapping fibers. The winding device expediently generates parallel windings on a spool which is suitable as a template for a ring spinning machine. The start / stop method of claims 39 and / or 41 enables the device to be started up or stopped automatically, for example after a thread break, in a simple manner, without operator intervention and while maintaining the sliver quality.

For the production of yarns, it is known (DE 26 60 746 C2, DE 32 37 989 C2) to warp a fiber sliver, for example a drawstring, in a drafting device and then to impart a twist to the warped fiber structure, the twisting in a first pneumatic one Swirl chamber is effected by air jets which act on the fiber structure in the sense of a swirl opposite to the swirl in the subsequent second pneumatic swirl chamber, so that a yarn is produced. Since for the production of a yarn the fiber structure has to be solidified in such a way that the highest possible tensile strength is generated in the yarn, this method is useless for the production of a roving sliver, which should be suitable as a template for spinning into a fiber yarn. This prior art is therefore not obvious and can not give any suggestion to use pneumatic twist for fiber yarns with high tensile strength to produce a warpable roving.

The method according to the invention and the devices used for it also differ significantly in their concrete implementation from this prior art, as will be described in detail below. These are exemplary designs which, even in a modified form, do not bypass the invention. There is a fundamental difference e.g. B. in the fact that a very fine, small diameter fiber bundle must be given in the yarn production. The air flow has few opportunities to apply torque to this fiber structure. Consequently, in the yarn manufacturing process, the fiber structure is deflected into a vibrating balloon, on which the air flow can act like a crank arm, in order to give the thread twist. This is particularly clearly described in DE 32 37 989 and shown in FIGS. 5 and 6 of this DE, the spinning action of the balloon causing the open-end formation or the detachment of open fiber ends between the output rollers of the drafting system and the first swirl element becomes. In this known device, the open fiber ends are around the wrongly rotated core of the fiber bandes looped, so that in this way the counter torque against the dissolution of the false wire is generated in the second nozzle (page 3, lines 62-63). A real twisted solid thread is created. Since it is important to make the fiber structure as warp resistant as possible for the production of a yarn (high tear strength), this procedure is neither comparable nor applicable with the invention, since the opposite is aimed at, namely a fiber structure that is still warpable create.

Further details of the invention will be described with reference to the drawings.

Show it:

Figure 1 is a schematic representation of the overall device for producing a process;

FIG. 2 shows the area of the device according to FIG. 1 with the pair of delivery rollers and the first swirl chamber;

Figure 3 shows the two swirl chambers in section;

Figure 4 shows a cross section of the first swirl chamber;

Figure 5 shows a cross section of the second swirl chamber;

Figure 6 shows another embodiment of the invention.

For the production of the roving for presentation in ring spinning machines, a roving machine is used with a drafting unit 3, which has pairs of drafting rollers 34 and 35 for the feed and first drafting of the feed belt S and pairs of rollers 36 and 31 for the main draft. A conveyor belt S, which is fed to the pair of feed rollers 34 with a sliver guide 32, normally serves as the feed belt. The usual sliver compactor in the stretching field in front of the main drafting field is dispensed with, since it is important in this process that the fuse should spread sufficiently during the draft to have a sufficient width B when it emerges from the exit roller pair 31 to have, which is necessary for the division of the emerging fiber structure F into edge fibers FR and a twisted core FD. The fiber structure F is then passed through a pneumatic swirl device which consists of a first swirl chamber 1 and a second swirl chamber 2. From this pneumatic swirl device, the solidified but warpable fiber structure F is drawn off by the delivery roller pair 4 and fed to a winding device 5. Both swirl chambers 1 and 2 each have a through channel 11 and 21, through which the fiber structure F is passed. The through channels 11 and 21 are arranged so that they are aligned with each other. The diameter D of these through-channels 11 and 21 is preferably approximately 1.5 to 4 times the diameter d of the fiber structure F. In this area, all the usual rovings can be produced with a single through-channel size. The diameter D of the through channel 11 or 21 is kept constant over the entire length of the channel.

In the first swirl chamber 1, holes 12 open into the through-channel 11 at an inclination angle α of preferably 45 °. The angle can, however, be in a range from 30 to 60 °, depending on the coordination of the swirl and injector action. Due to the tangential opening of the channels 12, a torque is exerted on the fiber structure F by the air flow. At the same time, the angle of inclination α creates a suction effect, as a result of which the fibers emerging from the drafting device 3 are sucked into the through-channel 11. The bores 22 in the second swirl chamber 2 are preferably rectangular, i.e. arranged at an angle of 90 °, but here too a suction effect can be advantageous for a better transition from the first to the second swirl chamber, so that the angle β of the bores 22 can be in a range from 45 to 90 °. At an angle of inclination β of 90 °, the best efficiency of the air flow for swirling is achieved, but there is a risk that the blown-in air will escape from the duct 21 against the direction of advance. This can be prevented by a slight inclination of the bores 22 and a suction effect can be generated at the same time.

As can be seen from FIGS. 4 and 5, about three bores are provided in the first swirl chamber 1, which are evenly distributed over the circumference of the channel 11, while eight bores 22 are provided in the second swirl chamber 2, which are also equally over the circumference of the Channel 21 of the swirl chamber 2 are distributed. In the case of a larger number of holes 12 and 22, respectively, expediently, distribution is not only carried out over the circumference of the through-channel 11 or 21, but also over the length.

Since the fiber sliver F emerging from the drafting device 3 is a relatively coarse fiber structure in comparison to yarn production, the lever arm given by the diameter d is large, so that the air flow can exert a large torque on the circumference of the fiber structure F. Ballooning in order to have a crank arm as a point of attack for the air flow for the swirling has proven to be disadvantageous. Balloon formation is avoided by tightly guiding the fiber structure F in the through-channel 11 or 21.

As can already be seen from the number of bores, a greater torque is exerted on the fiber structure F in the second swirl chamber 2 than in the first swirl chamber 1. However, the directions of rotation of both torques are opposite. As a result, part of the swirling in the first swirl chamber 1 is canceled by the second swirl chamber 2. However, there remains an excess of rotation due to the torque difference between the first and second swirl chamber, which continues in the fiber structure F into the nip line 33 of the pair of output rollers 31. This excess twist, however, must not be too strong, since otherwise the entire fiber structure F receives rotation and there is no splitting into edge fibers FR and a twisted core FD. Since the rotation is incorrect, the fiber structure F would have been turned over when passing through the pneumatic swirl device at the end of the second swirl chamber 2 and would therefore have no cohesion. The torque difference between the first and second swirl chamber is therefore adjusted so that only the core FD of the fiber assembly F receives rotation up to the clamping line 33, while the split edge fibers FR are looped around this rotated core by the counter-torque in the first swirl chamber 1. The roving sliver is therefore only cohesive through these edge fibers FR.

In order to give the fiber assembly F the necessary strength for the winding process, but which allows this fiber assembly F to be subsequently warped on the ring spinning machine, the zone between the clamping line 33 of the output roller pair 31 and the entry opening of the through channel .11 of the first swirl device 1 a division of the fiber structure emerging from the pair of output rollers 31 into edge fibers FR with a free end and the fibers FD twisted in the core of the fiber structure. These edge fibers FR are necessary in order to be looped around the core FD in the first twist chamber 1 in the opposite direction to the twist. For this process of cleaving fibers FR with a free end, it is necessary for the fiber structure to emerge in a desired width B from the clamping line 33 of the pair of output rollers 31. The only slight excess of rotation of the second swirl chamber 2 covers the core FD of the fiber structure, but only a part of the emerging fiber structure. The edge fibers FR are therefore only integrated on one side and therefore have a free open end. This free end is detected in the first swirl chamber 1 by the swirl flow and wound around against the direction of rotation of the second swirl chamber 2. When the false wire is released at the end of the second twist chamber 2, these edge fibers FR are tightened and give the fiber structure F the necessary hold, which is however only so large that the ability to warp is retained.

It has been shown that the distance A is of decisive importance for the splitting process in the area between the output roller pair 31 and entry into the through channel 11 of the first swirl chamber 1, the size of the distance A being measured according to the fiber length in the fiber structure. Particularly good results could be achieved if this distance A is not greater than the average fiber length, that is the length that 50% of the fibers have. If this condition for the distance A is exceeded, then the roving results in worse values. If the distance A becomes too large, the fiber structure F breaks and the entire process collapses. A smaller distance A has no further disadvantageous effect, but the distance A is limited by the nip of the output roller pair 31. It is important that a clear triangle of spins is formed in this area and that edge fibers FR are split off, which serve to wind around and thereby strengthen the fiber structure.

For the exit width B of the fiber structure, too, there has been an optimal value between twice to 5 times the diameter D of the through-channel 11. If this width B cannot be achieved by the usual drafting process, but without a sliver compressor, a suitable device for loading Provide mood of the outlet width B of the fiber structure F in the drafting system 3. This can also be a spreading device in order to achieve the width B of the fiber structure F required for the fiber spreading when it emerges from the output roller pair 31. However, it can also be a limiting device in order to achieve a width B required for the necessary separation of edge fibers FR with simultaneous edge fiber control. This device is to be arranged in the drafting system 3 against the feed direction in front of the pair of exit rollers 31, preferably in front of the main drafting zone.

The designs of the two swirl chambers 1 and 2 shown in FIGS. 2 and 3 have proven to be extremely advantageous in terms of manufacture and function. The first swirl chamber consists of a cylindrical outer part 1, into which an inner cylinder 14 is inserted against a stop 16. The outer cylinder 1 has a recess 15 on its inner circumference, which serves as an air duct for the compressed air entering through the opening 13. This inner cylinder 14 carries the nozzles 12, which are connected to the annular channel formed by the recess 15. In this embodiment, different inner cylinders 14 can be used for the same swirl chamber 1, which differ in the number and position of the nozzles 12 or also in the diameter of the through-channel 11. Sealing is carried out in a simple manner by means of two O-ring seals 17. The nozzles 12 are inserted or screwed into the inner cylinder 14. After insertion of this inner cylinder 14 into the outer cylinder 1, the nozzle 12 is fixed in its position, likewise by the stop 16, against which the inner cylinder 14 is pushed. This ensures that the nozzle 12 and the mouth of the through-channel 12 are positioned relative to the pair of output rollers 31 of the drafting system 3.

The swirl chamber also consists of a cylindrical outer part with a recess 25 on the inner circumference and a continuously cylindrical inner cylinder 24 inserted into this outer cylinder 2, into which the nozzle bores 22 are inserted. Here, too, various inner cylinders 24 can be inserted without changing the swirl chamber 2 itself. The air supply 23 into the swirl chamber 2 connects the nozzle bores 22 to the compressed air supply 23 via the ring channel formed by the recess 25, regardless of their number. Sealing is also carried out here by means of O-ring seals 27. Guiding the swirl chambers is not only easy with regard to their precise manufacture. Depending on the technological requirements, different inserts with different diameters of the through-channel 11 or 21 and nozzle bores 12 or 22 can also be used.

The device according to the invention achieved about 10 times the delivery speed compared to the flyer. Higher delivery speeds are quite possible, but it is necessary to adapt the swirl arrangement to such a higher delivery speed. It has proven to be expedient to keep the pressure and thus also the torque exerted in the first swirl chamber 1 constant and to adapt the required torque to the delivery speed only by changing the pressure in the second swirl chamber 2. If the delivery speed is higher, the pressure in the second swirl chamber must also be increased accordingly.

The second swirl chamber 2 is followed by a pair of delivery rollers 4, which feeds the finished fiber sliver to a winding device 5. Depending on the distance of this pair of delivery rollers 4 from the outlet opening of the through-channel 21 of the second swirl chamber 2, a sliver guide can be provided, which is expediently tubular. At this point, too, balloon formation should be avoided as far as possible, since these have a disadvantageous effect on the roving produced, e.g. can lead to uncontrolled incorrect warping or flinging of edge fibers FR and thus flight formation. Therefore, the free lengths between the swirl chambers 1 and 2 and the sliver guide should be kept as small as possible. However, these distances are necessary for the removal of the air emerging from the through channels 12 and 22.

Such a match guide is not shown in the exemplary embodiment shown. In order to ensure a good threading and a good transition from the exit from the second swirl chamber 2, this sliver guide can be funnel-shaped on the side facing the second swirl chamber 2. This sliver guide also has the task of introducing the finished roving into the draw-off roller pair 4. If necessary and desired, this sliver guide can also be used for traversing. The speed of the pair of delivery rollers 4 is expediently adjustable, since it has proven to be advantageous to subject the fiber structure between the pair of output rollers 31 of the drafting unit 3 and the pair of delivery rollers 4 to a delay. Depending on the distribution of the twist, the fiber material and the strength of the fiber structure, it is preferable to provide a negative warp which is between 0.97 and 0.99.

Finally, the supply roller pair 4 is followed by a winding device 5, on which a bobbin is produced which is suitable as a template for a ring spinning machine. In the case of ring spinning machines, the bobbins with parallel winding, which the flyer has known as a conventional roving machine, have been common. However, this type of winding requires a relatively high level of technical complexity and is therefore expensive. A cross-winding device, as is also common in the formation of bobbins for roving in the worsted area, has also proven itself very well in this roving machine.

Figure 6 shows another embodiment of the invention described above. It has proven to be extremely expedient to subject the finished fuse to a certain stretching by a tension delay before the winding. The delivery roller pair 4 is therefore followed by a further roller pair 41 for issuing this tension. The clamping line distance between the pair of rollers 4 and the pair of rollers 41 is slightly more than the length of the staple, here the length of the longest fiber is understood to be the length of the staple. This tension causes the wrapping fibers to be stretched, which has proven to be extremely advantageous for the winding and the further processing of the fuse on the ring spinning machine.

The tensioning delay between the delivery roller pair 4 and the tensioning roller pair 41 can be varied in the range from 1.05 to 1.5, depending on the fiber material and sliver fineness. As a result of the tension, the wrapping fibers are not only stretched, but the fiber assembly F is combined more strongly by the stretched wrapping fibers.

The embodiment shown in FIG. 6 has a single drive for the drafting rollers 34 and 35 and 36 and also for the pair of delivery rollers 31 and the tensioning roller pair 41. In a practical embodiment of this device, as with the known flyer, many work stations are arranged side by side on a machine frame. Since the production of each work place is very high, it would be extremely disadvantageous to have to shut down the entire machine in the event of a broken rag or another malfunction at one work station, to remedy the malfunction and then to restart all work stations. It should therefore be possible to shut down each individual job individually and to start up again. For this purpose, the individual drive has proven to be advantageous and easy to control compared to through shafts with couplings. Since the device does not produce a usable fuse in the start-up phase, during which the pressures in the swirl chambers 1 and 2 first have to build up, the work station is started up as follows:

The feed belt S is clamped in the feed area by the roller pairs 34 and 35, which are driven by a common controllable motor 43. The roller pairs 36 and 31 forming the main draft zone are each driven separately by the motors 44 and 45. Likewise, a separate drive 42 is provided for the delivery roller pair 4 and the tension roller pair 41. When the device is started, only the motors 44, 45 and 42, the compressed air for the swirl chambers 1 and 2, and the coil 5 start up with delay at a reduced speed. During this start-up, there is no fiber structure in the area between the stretching roller pair 36 and the spool 5. The pressure in the swirl chambers 1 and 2 is also reduced in accordance with this reduced starting speed and is therefore adapted. If the work process is to begin, the roller pairs 34 and 35 are now driven with delay, driven by the motor 43. As a result, the supply belt S is fed to the main drafting zone via the roller pairs 35 and 36. The fiber assembly F leaving the outlet rollers 31 of the drafting system 3 is sucked in from the mouth of the swirl chamber 1, passed through it to the second swirl chamber 2 and finally reaches the pair of delivery rollers 4 and the tensioning roller pair 41, from which the fuse is first discharged into a suction device 6 only a usable fuse with a corresponding structure arrives on the coil 5. After the required sliver quality has been reached, the sliver is removed from the suction 6 and placed on the spool 5. The manufacturing process is now in full swing at a reduced speed. The entire device is now ramped up from the reduced speed to the operating speed. The pressures in the swirl chambers 1 and 2 are readjusted to the final pressures in accordance with this run-up curve, so that a fuse of constant strength and the same fuse structure is always produced.

If the sliver breaks or the work station stops, the motor 43 is first stopped in the feed area, as a result of which the sliver is separated by the roller pairs 36 and 31, and 4 and 41 continuing to run. Except for the catchment area, the job is freed from the fuse F. As soon as the end of the fuse F has reached the fuse sensor arranged at the output of the delivery roller pair 4 or also the tension roller pair 41, the entire work station is shut down.

The designs described here are exemplary and can be modified in various ways. The explanations and observations described relate essentially to the spinning of short staple fibers, in particular cotton. However, the same device can also be used successfully for synthetic fibers with cut stacks or fiber blends and for long staple fibers. Of course, a certain adjustment of the dimensions and the application of the swirl chambers 1 and 2 is then necessary. However, this does not change the principle of producing a warpable roving with pneumatic twist described here. Instead of a 4-cylinder drafting system, a 3-cylinder drafting system can also be used. When several workplaces are arranged side by side, the suction devices 6 are expediently connected to a common suction channel 61. The sliver monitor 7 can be arranged at the outlet of the pair of rollers 41 or the pair of delivery rollers 4. It can be done mechanically or optically.

Claims

Patent claims

1. A process for producing a roving sliver, which is suitable as a template for spinning to a fiber yarn, for example on a ring spinning machine, whereby a drawstring is warped in a drafting system and this fiber structure is then given a twist before it is wound as a roving sliver on a supply spool, thereby characterized in that the fiber structure (F) emerging from the drafting device is guided into a pneumatic first swirl chamber (1) with a through-channel (11) in which air jets in the sense of swirling are opposite to the swirling in the subsequent second pneumatic swirl chamber (2nd ) act on the fiber structure (F).

2. The method according to claim 1, characterized in that the fiber structure (F) before entering the first swirl chamber (1) in edge fibers (FR) with a free end and twisted fibers (FD) is divided and the free ends of the edge fibers (FR ) in the first swirl chamber (1) in the opposite direction around the twisted fibers (FD).

3. The method according to any one of claims 1 or 2, characterized in that the width (B) of the fiber structure (F) emerging from the drafting system (3) to about three to five times the diameter (D) of the through channel (11) first swirl chamber (1) is tuned.

4. The method according to one or more of claims 1 to 3, characterized in that the air jets of the first swirl chamber (1) are directed so that a suction effect is exerted on the fiber structure (F) emerging from the drafting device (3).

Method according to one or more of claims 1 to 4, characterized in that the fiber structure (F) is wound up in parallel windings.

6. The method according to one or more of claims 1 to 4, characterized in that the fiber structure (F) is preferably wound up as a cross wrap.

7. The method according to one or more of claims 1 to 6, characterized in that the first swirl chamber (1) exerts a lower torque than the second swirl chamber (2) on the fiber structure (F), so that the fiber structure (F) by the second swirl chamber (2) receives an excess of rotation into the area between the drafting device output roller pair (31) and the first swirl chamber (1).

8. The method according to claim 7, characterized in that the torque difference exerted on the fiber structure (F) is adapted to the delivery speed by changing the pressure in the second swirl chamber (2).

9. The method according to claim 8, characterized in that for a higher delivery speed, the pressure in the second swirl chamber (2) is increased, while the pressure in the first swirl chamber (1) is kept constant.

10. The method according to one or more of claims 1 to 9, characterized in that the swirl chambers (1; 2) passing fiber structure (F) is subjected to a delay.

11. The method according to claim 10, characterized in that the delay is negative.

12. The method according to claim 11, characterized in that the delay is preferably 0.97 to 0.98.

13. The method according to one or more of claims 1 to 12, characterized in that the fiber structure (F) after exiting the pair of delivery rollers (4), but before it winds up, experiences a tension.

14. The method according to claim 13, characterized in that the tension is about 1.05 to 1.5.

15. An apparatus for producing a fiber sliver, which is suitable as a template for spinning into a fiber yarn, for example on a ring spinning machine, with a drafting device for distorting the conveyor belt and a pneumatic swirl device connected downstream of the drafting device, through which the fiber structure emerging from the drafting device receives a twist , as well as a receiving device for receiving the finished fiber sliver, characterized in that the drafting device (3) does not have a sliver compressor arranged in front of the drafting device outlet for combining the fiber structure (F) and the first pair of rollers (31) of the drafting device (3) has a first and a second swirl chamber (1; 2), each with a passage channel (11; 21) for the fiber structure (F), is arranged one after the other, through which the fiber structure (F) emerging from the drafting device (3) passes one after the other and each of which has opposite swirl effects the fiber structure (F) is exercised rden.

16. The apparatus according to claim 15, characterized in that a device for determining the outlet width (B) of the fiber structure (F) is provided in the drafting device (3) in the direction of passage in front of the pair of output rollers (31).

17. Device according to one of claims 15 or 16, characterized in that the first swirl chamber (1) is arranged at a certain distance (A) to the pair of output rollers (31).

18. The apparatus according to claim 17, characterized in that the distance (A) between the pair of output rollers (31) of the drafting system and the inlet opening of the through channel (11) of the first swirl chamber (1) is not greater than the average fiber length (= length of 50% the fibers).

19. The device according to one or more claims 15 to 18, characterized in that the through-channel (11; 21) for the fiber structure (F) preferential has a diameter ratio to the fiber structure (F) D: d of 1.5: 1 to 4: 1.

20. The device according to one or more of claims 15 to 19, characterized in that the through channels (11; 21) of the swirl chambers (1; 2) have a constant diameter (D).

21. The device according to one or more of claims 15 to 20, characterized in that the through channels (11; 21) of the first (1) and the second spiral chamber (2) are aligned.

22. The device according to one or more of claims 15 to 21, characterized in that the swirl chambers (1; 2) have bores (12; 22) which are tangent in the through-channel (11; 21) provided for the fiber structure (F). al open so that the air flowing in through the bores (12; 22) is a

Twist on the fiber bond (F) exerts.

23. The device according to claim 22, characterized in that the bores are arranged distributed over the length.

24. Device according to one of claims 22 or 23, characterized in that the bores (12) in the first swirl chamber (1) have an inclination angle (α) in the feed direction with respect to the axis of the through-channel (11).

25. The device according to claim 24, characterized in that the angle of inclination (α) is in a range from 30 ° to 60 °.

26. The device according to one or more of claims 22 to 25, character- ized in that the bores (22) of the second swirl chamber (2) have an angle of inclination (β) in the feed direction with respect to the axis of the through-channel (22), the size of the Range is 45 ° to 90 °.

27. The device according to one or more of claims 15 to 26, characterized in that the input of the through channel (11) of the first swirl chamber (1) is arranged offset to the clamping line (33) of the pair of output rollers (31) of the drafting device (3).

28. The device according to one or more of claims 15 to 27, characterized in that the second swirl chamber (2) is followed by a pair of delivery rollers (4) which feeds the finished fiber sliver to a winding device (5).

29. The device according to claim 28, characterized in that a sliver guide is arranged between the output of the through-channel (22) of the second swirl chamber (2) and the delivery roller pair (4).

30. The device according to claim 29, characterized in that the sliver guide is tubular.

31. Device according to one of claims 29 or 30, characterized in that the end of the sliver guide facing the second swirl chamber (2) is funnel-shaped.

32. Device according to one or more of claims 15 to 31, characterized in that the first swirl chamber (1) is subjected to a higher pressure than the second swirl chamber (2).

33. Device according to one or more of claims 15 to 32, characterized in that the speed of the delivery roller pair (4) to achieve a certain delay compared to the output roller pair (31) of the drafting device (3) is adjustable.

34. Device according to one or more of claims 15 to 33, characterized in that a further pair of rollers (41) is arranged downstream of the pair of delivery rollers (4).

35. Device according to one or more of claims 15 to 34, characterized in that the peripheral speed of the pair of rollers (41) relative to the pair of delivery rollers (4) is adjustable.

36. Device according to one or more of claims 15 to 35, characterized in that the winding device (5) generates parallel windings.

37. Apparatus according to claim 36, characterized in that the winding device (5) generates a spool which is suitable as a template for a ring spinning machine.

38. Device according to one or more of claims 15 to 37, characterized in that the winding device (5) is designed as a cross winder.

39. Device according to one or more of claims 15 to 39, characterized in that the swirl chambers (1, 2) have a replaceable inner part (14, 24), the carrier of the nozzle bores (12, 22) and the through-channel (11, 21) is.

40.Method for starting a device for producing a fiber sliver, which is suitable as a template for spinning to a fiber yarn, for example on a ring spinning machine, with a drafting device for distorting a conveyor belt and a pneumatic swirl device connected downstream of the drafting device, through which the exiting from the drafting device Fiber dressing receives a twist, as well as a receiving device for receiving the finished fiber sliver, for example according to one or more of claims 15 to 39, characterized in that the device, with the exception of the feeding of the supply belt (S), initially starts at a reduced speed with delay, the pressure in the swirl chambers (1, 2) is adapted according to the reduced speed, after reaching the reduced speed the feed of the supply belt (S) is switched on and the reduced speed is maintained until the fiber produced bandage (F) for winding on the coil (5) is placed, after which the device is run up to the desired final speed while adapting the Pressure in the swirl chambers (1, 2) to the respective speed of the device until the final speed and the final pressures in the swirl chambers (1, 2) are reached, so that a fuse of constant strength and structure is always generated.

41. The method according to claim 40, characterized in that the fiber structure (F) is removed during the start-up of the device.

42.Method for stopping the device for producing a fiber sliver, which is suitable as a template for spinning into a fiber yarn, for example on a ring spinning machine, with a drafting device for distorting a conveyor belt and a pneumatic swirl device connected downstream of the drafting device, through which the exiting from the drafting device Fiber association receives a twist, and a receiving device for receiving the finished fiber sliver, for example according to one or more of the claims

15 to 39, characterized in that the feed of the supply belt (34; 35) is first stopped when the remaining parts of the device continue to run, so that the fiber structure (F) is separated between the feed (34; 35) and the draft (36) until the fiber structure (F) still present in the device is removed from it, after which the device is stopped.

43. The method according to claim 42, characterized in that the still existing fiber structure (F) is removed in a suction (6).