JP2003049332A - Pneumatic spinning device and pneumatic spinning method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To propose a spinning method which can improve the quality of the spun yarn and reduce its loss, and to propose a spinning device. SOLUTION: This spinning method comprising exposing fibers 7 on a circling air whirlpool 15 in a spinning chamber 2, thereby twisting the fibers 7 to form a yarn 13 in the inlet opening of a spindle duct 11 of a spindle 12 disposed in the spinning chamber 2, wherein the fibers 7 are guided to the spinning chamber 2 via at least one fiber-feeding duct 20 or 21 separates fibers 17 not caught in the yarn-forming process (a) and feeds back the separated fibers 17 to the yarn-forming process (b).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic spinning device and spinning method according to the preamble of the independent claims.

[0002]

BACKGROUND OF THE INVENTION According to the prior art, it is known to spin yarn using an air stream. This spinning relates to the vortex air spinning method, in which the fibers fed from the fiber feed duct are fed into a swirling air vortex in the chamber.
In this swirling air vortex, the fibers are subjected to a twisting action, which causes them to be spun to form a yarn, which is in turn attached to a swivel or stationary spindle arranged substantially opposite the fiber supply duct. It is discharged through the spindle duct. In this process, at least one end of each fiber fed to the vortex remains free in the swirling air stream for a certain amount of time. The advantage of this spinning method is that at high processing speeds it is possible to achieve relatively high quality yarns comparable in quality to ring spinning.

In the method described, the required air vortices are generated by compressed air nozzles arranged tangentially in the spinning chamber. Compressed air passing through the spinning process is exhausted via an exhaust duct extending along the spindle and arranged coaxially with the spindle. Due to the relatively small dimensions of the spinning chamber and the exhaust duct and the high pressure of the air supplied, the flow velocity is correspondingly high. This flow velocity reaches almost the speed of sound in a specific region.

The spinning method known from the prior art, for example described in US Pat. No. 5,528,895, is characterized in that upstream of the inlet of the spindle duct, corona-shaped fibers supported by air vortices are formed. have. One end of each of the corona-shaped fibers is arranged in the spindle duct and forms a part of the yarn which is continuously discharged in the spindle duct. The important task of this corona-shaped fiber is to simplify, trap free-floating fibers and incorporate them into the spinning process.
Even with this device, the problem that some of the fibers are not trapped by the corona-shaped fibers and thus escape into the exhaust stream remains unsolved. Most of these lost fibers are short fibers, and these short fibers are
It is of considerable economic importance in quantity and is a loss in the spinning methods known from the prior art.

[0005]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to propose a spinning method and spinning device which can improve yarn quality and reduce fiber loss.

[0006]

According to the method of the present invention, the object is to expose a fiber in a spinning chamber to a swirling air vortex, which results in a spindle arranged in the spinning chamber. In the inlet opening of the spindle duct of the method for twisting fibers to form a yarn and guiding the fibers through at least one fiber supply duct into the spinning chamber: (a) fibers not caught in the yarn forming process From the exhaust duct, (b)
According to a method characterized in that the separated fibers are fed back to the yarn forming process, the spinning device according to claim 13 further comprises:
A spinning chamber is provided, and at least one fiber supply duct that joins the spinning chamber is provided,
The fiber supply duct serves to supply the fibers to be processed and is provided with a spindle arranged in the spinning chamber, the spindle having a spindle duct which serves to discharge the spun yarn, In the type in which an exhaust duct is provided, it is characterized in that means are provided for separating the fibers in the exhaust duct and means for feeding back the separated fibers to the spinning process. Was achieved by using a spinning device of

The invention is based on the fact that in a method as described above, the fibers carried by the exhaust are captured, regenerated and fed back to the spinning process at a given point. In this process, the fibers are separated from the exhaust stream in the first stage, and in the second stage, if necessary, any dirt particles are removed and oriented, and in the third stage using suitable means. Is fed back to the spinning process.
Different feedback points are provided depending on the area of use, and these different feedback points have different influences on the yarn forming process. An advantageous variant embodiment is described below.

A first variant of fiber feedback is designed so that the regenerated fibers are fed back to the central region of the swirling corona shaped fibers. Just as in the center of the spiral, relatively slow flow occurs in the central region of the swirling corona-shaped fibers. The fibers fed to this region are not exposed to the high-velocity flow occurring in the periphery, so that the fibers are correspondingly hardly steered. The use of this device produces a yarn having a core of relatively low twist fibers wrapped by a sleeve of twisted fibers.

The supply of fibers to the central region of the swirling corona-shaped fibers is preferably performed by separate fiber supply ducts arranged concentrically and / or one or more fiber feeds arranged eccentrically. Done through a duct. Under optimum conditions, fiber guiding means are used to ensure that the fibers reach the center of the swirling corona shaped fibers.
These means are, for example, conical elements, which are symmetrically shaped and arranged and point approximately towards the center of the swirling corona-shaped fibers. A conical guide means which tapers towards the center of the swirling corona shaped fibers and which is provided at the front end with one or more outlets for the fiber supply ducts is also suitable. Asymmetrical configurations may be used.

The fiber guiding means may be provided at the front end with projecting means, for example a tube, which additionally lengthens the outlet of the fiber supply duct. The fiber guide means does not have any sharp edges or steps that adversely affect the air flow conditions, the steps being advantageously smooth. Furthermore, the fiber guiding means serve as an aid to the twisting stop, so that the main fiber flow supplied, for example, via one or more main supply ducts arranged at the periphery, is directed in the opposite direction. And prevents undesired twisting, which can occur and extend into the feed area.

The fibers to be recycled are mainly short fibers,
These short fibers are so disadvantaged that in the first feeding step they are located farther from the center of the swirling corona-shaped fibers. If these regenerated fibers, collected by natural selection, are fed back to the center, yarns with short fibers in the center of the cross section, which are wound on the outside by long fibers, are produced. Depending on the type and type of fiber feedback, the fibers are more or less centered in the yarn cross section.

In addition to fed-back regenerated fibers, external fibers can also be supplied. These fibers can be, for example, endless fibers (endless filaments) or, for example, elastic fibers which are fed in in the drawn state, which influences the yarn produced.

Furthermore, it is also possible to pre-separate the fibers, in particular the short fibers, from the stream of fibers to be processed, which, as explained above, in the central region of the swirling corona-shaped fibers. Feed the fiber back into the spinning process. This reduces the likelihood that short fibers will be removed in the exhaust stream.

To aid the yarn forming process, a suction flow directed in the yarn conveying direction can be generated in the spindle duct. This is intended to help the fibers, in particular the short fibers, enter the inlet opening of the spindle duct. However, proper suction flow is not necessarily associated with the treatment of centrally fed fibers.

When guide threads are inserted, the device for feeding the fibers can also be used to facilitate the spinning start process. The centrally fed fibers prevent, in certain cases, the uncontrolled twisting of the outwardly wound fibers, which extends to the feeding area. The distance between the feed opening of the fibers to be reclaimed and the inlet opening of the spindle duct is adjusted by the fiber material to be processed.

In the described device, the spinning process can be influenced in a variety of additional ways. In addition to or apart from feeding the fibers to be regenerated, the feeding opening can also be configured as an additional air nozzle, which is used to
It can influence the yarn forming process. The fibers are centrally fluidized by the additional injection of a controlled amount of air. Due to this jetting effect, the fibers are actively incorporated into the yarn forming process. In addition, the central jet of air affects the region of slow flow in the center of the vortex.

In the spinning method described, a fiber preparation means is arranged upstream of the actual spinning device, including the spinning chamber, for preparing the fibers of the fiber sliver for the spinning process. work. In principle,
Two variants of the fiber preparation means are known, by means of which these fibers are prepared for the spin forming process. In a first variant, the fiber sliver is scoured (stretched) and collimated in a stretching system, for example as shown in EP 0488007. In a second variant embodiment, the fiber sliver is defibrated or opened using one or more opening rollers to break into individual fibers. Devices of intermediate construction of these two variant embodiments are also known. Based on these two variants as described, another variant of the invention is obtained.

In a first variant, the drawing system used as the opening means comprises, in a simplified embodiment, a first pair of rollers and a subsequent arrangement, viewed in the direction of fiber transport. A second pair of belts and a second pair of rollers. As a general rule, the fibers to be recycled are
Upstream of the pair of rollers and / or the pair of belts and / or
Alternatively, it is fed back upstream or downstream of the second pair of rollers. If it is desired to expose the regenerated fibers to the drawing process again, it makes sense to feed these regenerated fibers upstream of the drawing system. In contrast to the embodiments described above, in which the fibers are fed into the center of a swirling corona-shaped fiber, in the variant embodiment considered here, the yarn produced is generally indistinguishable from conventional yarn.

In the opening means referred to as the second variant, the fiber sliver of the fiber to be processed is guided through a supply duct and is received by a feed roller from which teeth or needles are fed. It is based on a device adapted to be delivered to an opening roller provided. In this process, the fiber sliver is compressed between the feed roller and the feed trough and delivered to the opening roller. The fibers of the fiber sliver are at least already carded or drawn so that they are oriented substantially parallel. The fibers are delivered from the opening roller to a suction roller having a lower peripheral speed than the opening roller. The suction roller is generally configured as a roller having a porous surface through which air is sucked inward, which causes the fibers to adhere to the roller surface. In a second variant of this opening means, the fibers to be regenerated are fed back into the process in the area of the supply duct or in the area of the opening roller or in the area of the suction roller. In order to optimally prepare the regenerated fibers for the yarn forming process, these fibers are preferably fed back into the area of the supply duct.

[0020]

The present invention will be described in more detail with reference to the accompanying drawings. The drawings are shown schematically and are largely simplified.

FIG. 1 shows a spinning device 1 in cross section. A drawing system 3 is arranged upstream of the spinning chamber 2. This drawing system 3 serves to prepare the fibers of the fiber sliver 4 for the spinning process carried out in the spinning chamber 2. The stretching system 3 comprises a first pair of rollers 5, another pair of rollers 5.1 and a pair of stretching belts 6 arranged between these rollers. These elements operate at different speeds, which are selected so that the fibers passing through them are oriented and scoured, in the process of arranging the fibers side by side in parallel, Fibers can be fed to the yarn forming process in suitable amounts.

The fibers 7 to be processed reach the inner chamber of the spinning chamber 2 via the fiber supply duct 8. In this inner chamber, swirling corona-shaped fibers 9 are formed by the fiber ends 10. The corona-shaped fibers 9 are supported by vortices 15 which are generated using a compressed air nozzle (not shown in more detail), which compressed air nozzle is indicated schematically by the arrow 15. , As seen from the front side (circle having a dot in the center) or the back side (circle having an X mark in the center). One end of the fiber 10 of each swirling corona-shaped fiber 9 is arranged at the inlet of the spindle duct 11 of the spindle 12. The spindle duct 11 serves to continuously discharge the yarn 13 from the spinning chamber 2. Fiber supply duct 8
The fibers 7 supplied from the above are guided to the inlet opening of the spindle duct 11 via the fiber guide means 14, whereby
The fibers 7 are received by the swiveling fiber ends and twisted to form a yarn.

Compressed air supplied into the spinning chamber 2 via a compressed air nozzle (not shown in detail) serves to generate a vortex 15 and extends parallel to and surrounds the spindle 12. It is exhausted through an annular exhaust duct 16 that is open. Not all fibers are trapped in the spinning process, so some of the fibers are exhausted with the exhaust air through the exhaust duct 16. These fibers 1
7 is mainly short fibers. The removed fibers 17 are
It is separated from the exhaust stream and regenerated as indicated schematically by arrow A. In a regeneration process (not shown here in detail), the fibers 17 are freed from any particles and residues, oriented, and reintroduced into the spinning process. Various feedback points are indicated by arrows B-E. The location of the feedback is selected depending on the textile material to be processed and the type of regeneration process used. If the fiber is to be subjected to further processing in the drawing process, the fiber is preferentially fed back to the location indicated by arrow B.

FIG. 2 shows another embodiment of the present invention. In this device, the fibers 17 in the exhaust stream are separated from the exhaust stream, regenerated and treated in a separate second fiber supply duct 2 arranged substantially coaxially with the spindle 12.
0 to the central region of the corona-shaped fibers 9 which are swirling in the spinning chamber 12. This step is indicated schematically by the arrow F. The first and / or second fiber supply ducts can be arranged at an angle or other means can be provided to prevent undesired twisting of the fibers.

The separation of the fibers to be removed from the air can be carried out mechanically or by the action of centrifugal forces, for example by diverting the flow, whereby the fibers are separated on the basis of inertia. Furthermore, it is also possible to use filters which are continuously cleaned. The filter can be a roller-supported, circulating filter tape with constant movement. The exhaust air is guided through this filter tape, which separates the fibers contained in the air. The fibrous material accumulated on the filter tape is recycled and fed back to the yarn forming process.
The fibrous material can be delivered, for example from a filter tape, to a suction drum forming part of the fiber preparation device.

In the regeneration process, the collected fibers are oriented and compacted to remove any impurities that may be present to form a fiber sliver, which allows the fibers to be subjected to the yarn forming process. Is prepared optimally. The regeneration process advantageously takes place in a drawing system or fiber opening means provided especially for this purpose.

The first fiber supply duct 21 is juxtaposed with the second fiber supply duct 20. This first fiber supply duct 21 is arranged offset with respect to the axis of the spindle 12 and is delivered from a drawing system or a fiber opening means known per se (both not shown in more detail). , To supply the fibers 7 to be processed. The fibers 7 are carried along the fiber guiding means 14.1.
The working area of the swirling corona-shaped fibers 9 is reached. In the working region of this corona-shaped fiber 9, the fiber end is captured by the swirling fiber 10 and is taken into the yarn forming process.

The fiber guiding means 14.1 comprises a spindle 12
Has a fiber guide surface 22 which is arranged coaxially with and extends substantially conically, which fiber guide surface 22 is partially flat and tapers towards the spindle duct 11. And German Patent No. 44317661 or US Pat. No. 5,528,89.
A projecting pin may be provided at the front end, as is known from US Pat. The second fiber supply duct 20 is
It extends inside the fiber guiding means 14.1 and coaxially with the fiber guiding means 14.1 to the tip of this fiber guiding means. The outlet opening 23 of the second fiber supply duct 20 is
It is arranged substantially opposite to the spindle duct 11.
The fiber guiding means 14.1 acts as a twist stop which prevents the fed fibers 7 from undergoing an undesired twisting action which may extend directly into the first feed duct.

Since not all the fibers 7 supplied are trapped in the yarn forming process, the fibers 7 are exhausted by the exhaust duct 1.
Escape to 6. These fibers 17 are mainly relatively short fibers and these short fibers are less likely to be incorporated into the yarn forming process. In the example shown here, these fibers 17
Is regenerated and then fed via a second fiber feed duct 20 to the center of the swirling corona-shaped fibers 9.
In this device, these fibers are arranged mainly in the center of the yarn cross section, in which the long fibers are wrapped around the short fibers. Since a relatively quiet flow condition occurs in the central region of the swirling corona-shaped fibers 9, the risk of short fibers being discharged with the exhaust is reduced.

The fiber supply duct 2 is shown in FIGS. 3A and 3B.
Two further variants of the 0,21 outlet openings are shown. Instead of a conical fiber guiding means, a fiber carrying edge 24 is provided here, as is known from Swiss Patent Application No. 1845/00. Due to the special air flow conditions in the spinning chamber, these fiber transport edges 24
These edges have the advantage that they have a tendency to deliver particularly high quality yarns.

In the illustrated embodiment, the spindle 12
The outlet opening of the second fiber supply duct 20 is arranged below the fiber conveying edge 24 which is arranged offset with respect to the inlet opening of the spindle duct 11. The fibers 7 to be processed are supplied to the spinning chamber 2 via a first fiber supply duct 21 and are delivered via a fiber conveying edge 24 to the operating area of the swirling corona-shaped fibers 9. At, the fiber 7 is incorporated into the yarn forming process. The fiber carrying edge 24 acts as a twisting prevention device and prevents undesired twisting of the fibers 7 to be processed which are returned to the fiber feeding area of the first fiber feeding duct 21.

The apparatus shown in FIGS. 3A and 3B is similar to that of FIG.
The difference is that the second fiber supply duct 20 in the device shown in B has a projection 25 which brings the fiber closer to the center of the swirling corona-shaped fiber 9. Work for. Second fiber supply duct 20
By adjusting the distance X between the outlet opening of the and the inlet opening of the spindle duct 11, the yarn forming process can be additionally influenced. The protrusion 25 of this device
Is designed as a tube with a constant cross-section protruding against the wall 26 of the spinning chamber 2. This tube extends approximately in the center of an air vortex (not shown in more detail) which carries the swirling corona-shaped fibers 9. The protrusion 25 is configured so that it does not adversely affect the swirling vortex, for example by generating a disadvantageous turbulence.

One or both of the fiber supply ducts 20, 21 can be fed with an air flow directed into the interior of the spinning chamber 2, in particular to additionally influence the yarn forming process. Additionally or alternatively, a unidirectional air flow can also be fed into the spindle duct. If so, and if the spinning device is properly configured and serves to receive the lead yarn, the second
The fiber supply duct 20 may also be used for the spinning start process.

FIG. 4 shows another embodiment of the present invention. In this device, the fibers 17 are separated from the exhaust in the exhaust duct 16, regenerated and fed via a second fiber feed duct to the central region of the swirling corona-shaped fibers 9. The fibers 17 are separated from the exhaust stream by a circulating endless filter tape 50. The filter tape 50 of this device is configured such that the separated fibers 17 are carried over a predetermined distance and then delivered to the suction roller 51. The suction roller 51 of this device is arranged upstream of the second fiber supply duct 20 and at the same time assists in the fiber insertion. The suction roller 51 can also be arranged in cooperation with the fiber opening means. The filter tape 50 is configured such that it separates the fibers 17 from the exhaust stream but removes any residual particles 52 that may form. This process is indicated schematically by arrow 53. Instead of using a circulating endless filter tape 50, the fibers to be separated can also be fed back into the air flow, for example in a suitable hose.

FIG. 5 shows a spinning device 1 similar to the device described in the same applicant in Swiss patent application No. 1845/00, with the fiber opening means arranged upstream of this spinning device. ing. The fiber opening means 30 has a supply duct 31 that serves to supply the fibers 7 to be processed. A supply roller 32 and a supply trough 39 are arranged at the outlet end of the supply duct 31. The supply roller 32 and the supply trough 39 serve to open the fiber 7 to be processed with teeth or needles. It is used to deliver to the roller 33. In this delivery process, dirt particles and any residuals 35 are removed in a first stage and then via a corresponding first exhaust duct 38. The fiber 7 is delivered from the opening roller 33 to the suction roller 34. Generally, the suction roller 3
4 is configured as a roller having a porous surface, through which air is sucked in,
As a result, the fibers 7 adhere to the roller surface. During the delivery process, the fibers are sharply deflected, residual dirt particles 35 and residue 35 are removed and discharged via a separate exhaust duct 38. The fiber 7 to be processed is the suction roller 3
4 from the delivery roller 40 to the fiber supply duct 36
Guided through the fiber supply duct 36, the fibers reach the spinning chamber 2.

In the embodiment of the invention shown in FIG. 5, the fibers 17 contained in the exhaust gas are separated from the exhaust gas, regenerated if necessary and then delivered via the duct 37 to the opening roller 33. Using this opening roller 33, the fibers are again ready for the yarn forming process. The supply of the removed fibers is carried out in such a way that any residual dirt particles which may form are separated. In the device shown here, the short fibers 17 separated from the exhaust gas are mixed with the fibers 7 to be processed, which are supplied from the supply duct 31. This feedback improves the efficiency of the spinning process over known spinning methods. The supply of the removed fibers takes place in the working area of the opening roller, which is then delivered to the suction roller, whereby the fibers are oriented again and mixed with other fibers. The regeneration process optimally prepares the fibers for the yarn forming process, which results in uniform yarn.

Another embodiment is provided by combining the features of the different embodiments shown in the drawings.

[Brief description of drawings]

FIG. 1 shows possible fiber feedback points in a drawing system.

FIG. 2 shows fiber feedback to the center of a swirling corona shaped fiber.

FIG. 3 shows another two variation examples for central feedback of corona shaped fibers.

FIG. 4 is a diagram showing another modified embodiment of fiber feedback.

FIG. 5 is a view showing a spinning device having a fiber opening means and a spinning chamber.

[Explanation of symbols]

1 spinning device, 2 spinning chamber, 3 drawing system, 4 fiber sliver, 5, 5.1 roller, 6
Stretch belt, 7 fiber, 8 fiber supply duct,
9 swirling corona shaped fibers, 10 fiber ends, 11
Spindle duct, 12 spindles, 13
Yarn, 14.1 fiber guide means, 15 vortex, 16 exhaust duct, 17 fiber, 20,21 fiber supply duct, 22 fiber guide surface, 23 outlet opening, 24
Fiber conveying edge portion, 25 protruding portion, 26 wall, 30 fiber opening means, 31 supply duct, 32 supply roller, 33 opening roller, 34 suction roller, 35
Residual dirt particles, 36 fiber supply duct, 37 duct, 38 exhaust duct, 39 supply trough, 40
Delivery roller, 50 filter tape, 51 suction roller, 52 residual particles, 53 arrow

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Peter Andereg             Switzerland, Winterthur Leich             Enbergstrasse 21 F-term (reference) 4L056 AA19 BA01 BB08 BD12 BD28                       BD33

Claims (22)

[Claims] 1. Fiber (7) in the spinning chamber (2)
A method for producing a yarn (13) from a spinning chamber (2), wherein the fiber (7) is exposed to a swirling air vortex (15) in the spinning chamber (2), whereby in the spinning chamber (2). At the inlet opening of the spindle duct (11) of the spindle (12) arranged in the above, the fiber (7) is twisted to form the yarn (13), in which case the fiber (7) is The spinning chamber (2) via at least one fiber supply duct (20, 21)
(A) fibers (17) not captured in the yarn forming process,
Yarn is manufactured from fibers in a spinning chamber, characterized in that it is separated from the exhaust duct (16) and (b) the separated fibers (17) are fed back to the yarn forming process. Way for. 2. The separated fibers (17) are regenerated so that in this regeneration process any dirt particles are removed from the fibers (17) and, if necessary, the fibers (17) are oriented. The method according to claim 1, wherein 3. A method according to claim 1 or 2, wherein the fibers (17) are separated from the exhaust stream using a circulating endless filter tape (50). 4. The circulating endless filter tape (5)
Method according to claim 3, characterized in that 0) is used to transfer the separated fibers (17) to a suction roller (51). 5. A method according to claim 4, wherein the suction roller (51) is co-operating with the fiber opening means (30). 6. A method according to claim 5, wherein the suction roller (51) serves to feed the removed fibers (17) to a second fiber feed duct (20). 7. The fiber (7) to be processed is passed through a first fiber supply duct (21) and the separated fiber (17) is passed through a second fiber supply duct (20). 7. A method according to any one of the preceding claims, wherein the spinning chamber (2) is guided. 8. The method of claim 7, wherein the separated fibers (17) are fed to the center of the swirling air vortex (15) using the second fiber feed duct (20). Method. 9. A fiber (1) separated from said exhaust stream.
7) is handed over to the fiber preparation means (30) for exposure to the regeneration treatment, in which the fibers (17) are mixed with the fibers (7) to be treated and the fibers (7) 3.) A method according to claim 2, in which the thread forming process is prepared with. 10. A method according to claim 9, wherein the fiber preparation means (30) is a drawing system. 11. The fiber preparing means (30) is a fiber opening means, and the fiber opening means (30) comprises a feed roller (32), an opening roller (33) and a suction roller (3).
4) The method according to claim 9, comprising: 12. The regenerated fiber (17)
8. Method according to claim 7, wherein the feed roller (32) and / or the opening roller (33) are fed in the region. 13. A spinning device (1) for carrying out the method according to claim 1, wherein a spinning chamber (2) is provided, the at least one fiber supply duct joining the spinning chamber (2). (21) is provided, the fiber supply duct (21) serving for supplying the fibers (7) to be processed, the spindle (1) being arranged in the spinning chamber (2).
2) is provided, the spindle (12) of which serves to discharge the spun yarn (13).
1) with an exhaust duct (16) being provided, separated from the means (50) that serves to separate the fibers (17) in the exhaust duct (16). Fiber (17)
Means (37, 50) that act to feed back to the spinning process.
A spinning device for carrying out the method according to claim 1. 14. The spinning device according to claim 13, wherein the means for separating the fibers (17) is a circulating endless filter tape (50). 15. The spinning device according to claim 14, wherein a suction roller (51) is provided for pulling the fibers (17) from the filter tape (50). 16. A means for feeding back the separated fibers comprises a second fiber supply duct (20).
And said second fiber supply duct (20) is adapted to supply said separated fibers (17) to said spinning chamber (2).
The spinning device according to any one of 5 to 5. 17. The second fiber supply duct (20).
17. The spinning device according to claim 16, wherein the spinning fibers are arranged such that the separated fibers (17) are fed to the center of the swirling air vortex (15). 18. The first and / or second fiber supply ducts (20, 21) are arranged to prevent undesired twisting of the fibers (7, 17). Or the spinning device according to item 17. 19. The spinning device according to claim 16, wherein the first and / or second fiber supply ducts (20, 21) are curved or angled. 20. The spinning device according to claim 13, wherein the at least one fiber supply duct (20, 21) is provided with a fiber conveying edge. 21. The spinning device according to claim 13, wherein the at least one fiber supply duct (20, 21) transitions into a substantially conical fiber guide surface. 22. A yarn (13) produced by one of the methods of claims 1 to 12, wherein a fiber (17) is arranged in the center of the cross section of the yarn (13), The fibers (17) are mainly the second fiber supply duct (2
0) and is surrounded by fibers (7) which are supplied mainly from the first fiber supply duct (21). A thread produced by one.