JP2023129334A - Air spinning device and method of surface-processing inside air spinning device - Google Patents

Abstract

To provide a method of enabling an easy and quick surface processing of an air spinning device, particularly capable of cleaning and/or supplying an additive.SOLUTION: The present invention relates to an air spinning device 2 and a method of surface-processing inside the air spinning device. The air spinning device comprises: a yarn pull-out passage 3 including an outlet 17 for leading out a yarn from the air spinning device and crossing a spinning corn 5; a spinning housing 13 surrounding the spinning corn; and a nozzle device 6 capable of supplying compressed air. The air spinning device is provided, for providing the method of surface-processing inside the air spinning device and the air spinning device, with a fluid supply device 11a configured to supply fluid to the front of an outlet of the yarn pull-out passage on an outlet side or to lead in the fluid to the inside of the outlet of the yarn pull-out passage.SELECTED DRAWING: Figure 1

Description

The present invention is an air spinning device and a method for surface treating the inside of the air spinning device, comprising:
- a spinning cone with a yarn withdrawal passage, the yarn withdrawal passage having an outlet for leading out the spun yarn from the air spinning device;
- a spinning housing spaced apart from and surrounding the spinning cone;
- a pneumatic spinning machine and a method, comprising a nozzle device capable of supplying compressed air for generating an air flow flowing around the spinning cone in an enclosing gap between the spinning cone and the spinning housing.

In the textile industry, a wide variety of methods and spinning devices are known in connection with the production of fiber yarns. For example, ring spinning machines and/or open-end rotor spinning machines have been popular for some time and have proven to be more suitable. Furthermore, in particular in connection with the processing of synthetic yarn materials, air spinning devices are also known, in which a predrawn sliver is processed via an air stream flowing around a hollow spinning cone. A thread is formed from it. Inside the air spinning device, the outer fibers of the sliver are then spun in a known manner in the surrounding gap between the spinning cone and the spinning housing using a rotating flow generated by one or more air nozzles. It is placed around the spinning cone and wrapped helically around the core fibers of the sliver. This forms an air-spun yarn with suitable strength properties, which is conveyed to the winding device via the outlet of the yarn withdrawal channel formed by the hollow chamber of the spinning cone, where it is transported to the winding device. , the air spun yarn is wound up.

Air spinning can basically be carried out with fibers made of several different materials, in this method natural fibers such as cotton and/or animal hair, synthetic fibers such as polyester and natural fibers are used. A mixed fiber consisting of a synthetic fiber and a synthetic fiber can be used. In practice, especially when spinning polymer fibers, especially fibers made of polyester (PES), polymer residues, polyester fiber fragments and finishes often accumulate on the surfaces of air spinning equipment. Such deposits can significantly impede the air spinning process and can significantly reduce the spinning result and thus the yarn quality. In particular, during the air spinning process there is a risk of yarn breakage due to the resulting increased friction between the surface of the air spinning device and the fibers. Furthermore, the air nozzles and other parts of the air spinning device may become blocked by deposits, which results in the resulting yarn having lower strength and quality. The possible spinning area is also disadvantageously limited by such deposits.

In order to avoid such defects, it is necessary to clean the air spinning device at regular intervals, which requires not only interruptions in the spinning process, but also opening the air spinning device. This results in long downtimes of the air spinning device and associated production interruptions.

With this in mind, the problem underlying the present invention is to improve a method for surface treating, in particular cleaning and/or supplying an air spinning device with additives, and to improve the air spinning device. The object is to allow a simple and rapid surface treatment of the device, in particular cleaning and/or additive supply.

The invention solves this problem with a method for surface treating, in particular cleaning and/or supplying an air spinning device with the features of claim 1 and an air spinning device with the features of claim 9. Solved by. Advantageous refinements of the method according to the invention are described in the dependent claims 2 to 8. Further embodiments of the air spinning device according to the invention are set out in the dependent claims 10-12.

The method according to the present invention includes:
An air spinning device,
- a yarn withdrawal channel across the spinning cone, with an outlet for removing the spun yarn from the air spinning device;
- a spinning housing, in particular coaxially arranged at a distance from the spinning cone and surrounding the spinning cone;
- Suitable for pneumatic spinning devices with a nozzle device capable of supplying compressed air to generate an air flow flowing around the spinning cone in an enclosing gap between the spinning cone and the spinning housing.

Yarn withdrawal channel in the sense of the invention means a channel in which the air-spun yarn can be withdrawn or removed from the spinning device. The yarn withdrawal channel preferably consists of one or more parts and may more preferably be formed coaxially with respect to the spinning cone, thereby increasing the efficiency in the design of the spinning cone and the air spinning device. You can gain freedom.

According to a preferred embodiment, the spinning cone may likewise consist of one or more parts and, more preferably, may at least partially or completely surround the yarn withdrawal channel. For example, the spinning cone is arranged along the yarn withdrawal path and thus along the yarn running direction and the yarn withdrawal direction such that the inlet opening of the spinning cone for accommodating the yarn simultaneously forms the inlet opening of the yarn withdrawal path. It may have an extended length. The outlet opening of the spinning cone for removing the yarn from the spinning cone may furthermore preferably form the outlet of the yarn withdrawal channel. In contrast, in an alternative embodiment, the outlet opening of the spinning cone is connected to the through opening of the yarn withdrawal channel, the yarn withdrawal channel extending from at least two parts, namely across the spinning cone. It is formed by a first yarn withdrawal channel section and a second yarn withdrawal channel section which connects to the spinning cone in the yarn running direction. The second thread withdrawal channel section may furthermore preferably be formed by a spinning housing.

According to another preferred embodiment, the thread withdrawal channel is configured linearly along the thread running direction, in particular linearly in the axial direction, without deflection sections, or alternatively, the thread to be withdrawn is It may be constructed with at least one deflection section for deflection from the yarn running direction. The thread running direction corresponds to a straight connecting line extending between the inlet opening and the outlet. The deflection section may be a bend in the thread withdrawal channel or a projection projecting into the thread withdrawal channel. Using one or more deflection sections arranged along the yarn running direction, the yarn can be deflected in order to influence the properties of the yarn. For example, the configuration of the deflection section can influence the fluff of the yarn as required. If it is desired to provide a plurality of deflection sections, for example to form a helically extending thread withdrawal channel section, a vortex can be applied to the thread to be drawn off.

According to the invention, the spinning housing surrounds the spinning cone. This configuration refers to the configuration of a spinning housing that annularly surrounds the spinning cone at least radially along the yarn running direction, and which, in a typical configuration, is used for accommodating and feeding the sliver to the spinning cone. , having an inlet spaced apart from the spinning cone. The spinning housing is preferably arranged coaxially with respect to the spinning cone. The spinning housing preferably has a through passage forming an outlet, in which the outlet is arranged, or a segment containing the outlet, for example of a spinning cone or a thread withdrawal passage, through which the outlet is arranged. is extending.

According to a preferred embodiment, the spinning housing may consist of one part or, in a typical configuration, of several parts. The multi-part construction advantageously makes it possible to open the air spinning device, thereby easily ensuring access to the spinning cone. For example, a spinning housing formed from multiple parts may include two spinning housing segments, both spinning housing segments being movable relative to each other, one spinning housing segment containing the sliver and The other spinning housing segment supports the spinning cone and includes an inlet for feeding the spinning cone.

In principle, the spinning housing may, according to a preferred embodiment, have an inlet, an internally located swirl chamber comprising a surrounding gap, and preferably a plurality of swirl air nozzles opening into the swirl chamber; These swirl air nozzles are particularly preferably fluidly connected to at least one air supply line, so that during operation of the air spinning machine, the compressed air provided by the air supply line is passed through the swirl air nozzles. , into the swirl chamber or surrounding gap. One or more swirl air nozzles are arranged in a known manner inside the swirl chamber for air spinning the sliver into a yarn in order to generate an air swirl. The swirl chamber is located downstream of the inlet along the conveying direction of the sliver, which corresponds to the yarn running direction.

In the method according to the present invention, during the spinning process or during interruption of the spinning process,
- supplying the fluid in front of the outlet or introducing it into the outlet on the outlet side;
- characterized in that a nozzle device is used to generate an air flow that flows around the spinning cone in the surrounding gap.

According to the method according to the invention, after a predefined spinning time or operating time or similar time has elapsed, at a defined or predefinable point during the spinning process or, for example, when yarn breakage or cutting or maintenance During planned or unplanned spinning process interruptions as a result of actions, package changes, current/voltage faults, detected differences in yarn quality, the fluid is diverted on the outlet side in front of the outlet of the yarn withdrawal channel. feeding or introducing into the outlet of the thread withdrawal channel. In the sense of the invention, feeding forward means feeding fluid into the region outside the thread withdrawal channel and in front of the outlet, in this form of fluid supply, the supplied fluid is transferred to the thread withdrawal channel. It can be inhaled by the negative pressure that exists within it. The yarn withdrawal channel extends, as mentioned above by way of example, from the inlet or inlet opening of the spinning cone, viewed in the yarn running direction, to the outlet of the pneumatic spinning device, which outlet can e.g. formed by an open end. Before the start of the fluid supply, during the start of the fluid supply or after the start of the fluid supply, an actuated nozzle device, preferably comprising a swirl air nozzle, generates a spinning pressure by means of an air flow flowing around the spinning cone in the surrounding gap. This spinning pressure creates a negative pressure in the inlet of the spinning cone and thus in the yarn withdrawal channel, which causes the fluid supplied in front of the outlet or introduced into the outlet to be air-spun on the outlet side. It is ensured that the spinning cone can be reliably removed on the inlet side of the device. Due to the spinning pressure, the fluid will be directed through the surrounding gap at least over the peripheral surface of the spinning cone, thereby affecting the inner surface of the yarn withdrawal channel and the surface area of the air spinning device forming the spinning cone, more preferably Reliable feeding of the surface area surrounding the spinning cone is achieved.

The preferred method therefore makes it possible to reliably supply the pneumatic spinning device with fluid even in a closed readiness state, so that the surfaces of the pneumatic spinning device can be treated in a defined manner.

The surface treatment is, according to one preferred embodiment, a cleaning and, according to another, an additive supply, with the former the surface of the air spinning device, in particular during spinning interruptions, and the latter with the yarn. The surfaces of the fibers and the air spinning device can optionally be treated or provided with additives, especially during the spinning process. The additive supply acts advantageously during deposition in the fibers of the yarn, especially for subsequent treatment processes of the yarn. Furthermore, the additive supply can be used to form a layer or film on the surface of the air spinning device, which layer or film prevents deposits on the surface and thus possible blockages, and between the surface and the fibers. can reduce the frictional effect on the

The supply of a fluid for cleaning purposes and/or as an additive can dispense with time-consuming opening or disassembly of the air spinning device, thereby making it possible, in particular, to eliminate the opening or disassembly of the air spinning device for cleaning the air spinning device. Compared to cleaning methods known from the prior art in which disassembly takes place, the downtime is significantly shorter. Furthermore, this makes it possible to supply the fluid in an alternative format, which in particular saves construction space. This is because the normal fluid supply in the area of the sliver introduction section or in the area of the open air spinning device can now be distanced. In other words, it is possible to keep the distance between the air spinning device and the exit roller pair of the drafting device, which is placed upstream of the air spinning device in the yarn running direction or the sliver feeding direction, to a small distance. An almost transition-free supply of the sliver to the sliver can be guaranteed. Furthermore, provision means for introducing additives into the open area of the air spinning device can be dispensed with. The interval between the fluid supply steps is preferably freely selectable and can be adjusted accordingly, in particular due to the short surface treatment time compared to known methods, such as for example short cleaning times or additive supply times. During the downtime, in particular more frequent surface treatments, preferably cleaning or additive feeding, are possible, alone or in combination, which makes it possible to ensure high production reliability.

The selection of the fluid, the form of supplying the fluid in front of the outlet on the outlet side, and the form of introducing the fluid into the outlet can basically be done arbitrarily. It can be fed in front of or introduced into the outlet. According to a preferred embodiment of the invention, it is specified that the fluid is supplied in front of the outlet or is atomized before being introduced into the outlet. Atomization refers to the separation of a liquid into fine particles as an aerosol in a gas, such as air. By supplying or introducing the fluid forward as an aerosol, it is possible to minimize the amount of fluid required for surface treatment and at the same time to achieve a good distribution of the fluid on the surface to be treated of the air spinning device. can be guaranteed. The preferred use of a sprayed fluid, ie an aerosol, also allows a particularly rapid drying of the surface of the air spinning device, thereby making it possible to supplementally shorten the downtime of the air spinning device.

The configuration in which the fluid is supplied on the outlet side in front of the outlet of the thread withdrawal channel or the configuration in which the fluid is introduced into the outlet of the thread withdrawal channel is likewise basically freely selectable. According to a preferred embodiment of the invention, it is specified that the fluid is introduced into the thread draw-off channel via a supply line connectable to the outlet of the thread draw-off channel.

According to this preferred configuration of the invention, in order to supply fluid into the thread withdrawal channel, a supply line conducting the fluid is connected to the outlet of the thread withdrawal channel, thereby in turn supplying the fluid as a liquid stream or It has been specified that it can be fed in sprayed form as an aerosol directly into the thread withdrawal channel. This preferred configuration of the invention particularly reliably guarantees a complete supply of fluid into the yarn withdrawal channel, which makes it possible at the same time to prevent fluid from reaching the surrounding area of the air spinning device. . The supply line is preferably adapted to the configuration of the outlet of the thread withdrawal channel, thereby making it possible to ensure a leak-tight introduction of the fluid into the thread withdrawal channel.

According to another advantageous development of the invention, it is specified that the fluid is supplied to the thread withdrawal channel via a supply line which terminates adjacent to the outlet of the thread withdrawal channel. According to this preferred embodiment of the invention, the fluid is supplied in front of the outlet of the yarn withdrawal channel outside the pneumatic spinning device in the yarn running direction, adjacent to the outlet of the yarn withdrawal channel, which means that, for example, the supply This can be achieved by conduit. The end of this supply line is connected to the outlet of the yarn withdrawal passage so that the supply line is located outside the yarn running path during the spinning process and does not affect the operation of the air spinning device during the spinning process. It is placed in a fixed position. The supply line is then oriented in such a way that the outflowing fluid is fed in front of the outlet of the yarn withdrawal channel or at the outlet of the yarn withdrawal channel. This makes it possible to dispense with the connection step between the supply line and the outlet of the air spinning device, in particular after interruption of the spinning process, thereby making it possible to additionally shorten the downtime.

According to another advantageous embodiment of the invention, the fluid is led out via an expansion chamber adjoining the enveloping gap in the thread running direction and an outflow channel of the pneumatic spinning device connected to the expansion chamber. has been identified. Due to the spinning pressure generated by the nozzle device, the fluid flows from the inlet of the yarn withdrawal channel into the surrounding gap between the spinning cone and the spinning housing and thus into the expansion chamber adjacent to the surrounding gap. The fluid can then be reliably led out of the air spinning device, in particular together with the deposits and contaminants removed by the fluid, via an outflow channel connected to conduct the fluid into the expansion chamber. The fluid may then be collected, for example in a controlled manner, and optionally fed to after-treatment equipment, such as filtration equipment and recycling equipment.

According to another advantageous embodiment of the invention, it is specified that the fluid is supplied to the area of the yarn preparation unit which follows the outlet of the yarn withdrawal channel of the air spinning device in the yarn withdrawal direction.

If the spinning process is interrupted, for example due to a break in the fed sliver or because the spun yarn is cut off by controlled cutting by a yarn clearer, subsequent In the spinning start step, the yarn end of the already spun yarn, generally wound up on the corresponding winding package, is first recalled and passed through the air spinning device at least in front of the inlet of the spinning cone or in the area of the drafting device. need to be transported to. For this purpose, it is already known to use a yarn preparation unit, which has, for example, a yarn deflection unit and a yarn guide channel arranged in this yarn deflection unit, and which has a yarn Inside the preparation unit, the yarn received from the winding package, for example a twill package, is untwisted, loose fibers are removed and the yarn is passed through the outlet of the yarn guide channel of the air spinning device, opposite to the yarn running direction. It is fed to the front of the spinning cone to start spinning.

According to a preferred refinement of the invention, the fluid is supplied into the interior of the yarn preparation unit, for example into the yarn guide channel, during an interruption of the spinning process, that is to say with or after the beginning of the interruption, and then , it has been specified that the fluid from this yarn guide channel reaches the air spinning device via the outlet of the yarn withdrawal channel based on the spinning pressure. This preferred embodiment of the invention ensures a particularly uniform and reliable supply of fluid into the air-spinning device, and optionally also the yarn preparation unit downstream of the pneumatic-spinning device can be cleaned to remove contaminants. is removed, which particularly ensures the removal of contaminant build-up in the area of the yarn run between the air spinning device and the winding package, and optionally the above-mentioned layer or film is applied to the surface of the yarn preparation unit. can be additionally provided.

According to a preferred embodiment of the invention, the generation of the dynamic pressure by actuation of the nozzle arrangement which generates the air flow in the surrounding gap takes place temporally before or at the beginning of the introduction of the fluid. This preferred configuration of the invention ensures that sufficient dynamic pressure is already present at the time of introduction of the fluid, thereby ensuring that the fluid enters the air spinning device via the inlet of the spinning cone. where it can be used to treat the surface of air spinning equipment.

According to another advantageous embodiment of the invention, the air flow is maintained in the surrounding gap at least temporarily, that is to say for a defined or definable time, even after the introduction of the fluid has ended in time. has been identified. This preferred embodiment of the invention provides that the drying of the treated surface is carried out by means of an air flow that is still present even after the introduction of the fluid has already ended, which can, for example, interfere with the spinning process under certain circumstances. Liquid residues, such as droplets or the like, which could lead to contamination, are particularly effectively avoided.

The object of the invention is furthermore an air spinning device, a spinning cone having a yarn withdrawal channel, the yarn withdrawal channel having an outlet for withdrawing spun yarn from the air spinning device. and, in particular, a spinning housing arranged coaxially and spaced from the spinning cone and surrounding the spinning cone, and an air flow flowing around the spinning cone in an enclosing gap between the spinning cone and the spinning housing. The invention is solved by an air spinning device comprising a nozzle device to which compressed air can be supplied for generation. According to the invention, this pneumatic spinning device has a fluid supply device configured to supply fluid on the outlet side in front of the outlet of the yarn withdrawal channel or to introduce fluid into the outlet of the yarn withdrawal channel. .

The air spinning device may have a configuration according to one of the embodiments described above.

Air spinning device refers to a fluid supply device which is used to supply fluid in front of or into the outlet of a yarn withdrawal channel, in particular at least during the spinning process or during interruptions in the spinning process. A feature that allows surface treatment of the interior of the pneumatic spinning device to be carried out without prior disassembly or opening of the pneumatic spinning device. The fluid supply device is preferably configured such that, via this fluid supply device, a fluid conveyed, for example from a suitable reservoir, can be supplied in front of the outlet of the thread withdrawal channel, and then the fluid is , based on the spinning pressure caused by the operation of the nozzle device, reaches into the air spinning device through the outlet of the yarn drawing passage and treats the surface of the air spinning device. As an alternative to such an arrangement, the pneumatic spinning device is preferably configured to introduce fluid, for example conveyed from a suitable reservoir, into the outlet of the yarn withdrawal channel.

This allows the air spinning device to carry out the removal of deposits and contaminants inside the air spinning device particularly easily and comfortably without the need for opening or disassembling the air spinning device, thereby making it possible to The downtime of the air spinning device required for cleaning can be particularly shortened. As an alternative to this effect, the surface can be provided with a layer or film in the manner described above.

The air spinning device is preferably configured to carry out the method according to any one of the preferred embodiments described above.

The configuration of the fluid supply device for supplying or introducing fluid forward is essentially freely selectable. According to a preferred embodiment of the invention, the fluid supply device has a supply line, which can be connected in particular in a liquid-tight manner to the outlet of the thread withdrawal channel and/or which can be arranged adjacent to the outlet of the thread withdrawal channel. Identified. According to this preferred embodiment of the invention, the fluid supply device has, for example, a supply line connected to a fluid reservoir, via the outlet of which the fluid is supplied to the outlet of the thread withdrawal channel. be done. To that end, the supply line may preferably be configured to connect the supply line directly to the yarn withdrawal channel and to ensure that the fluid exiting from the supply line reaches the outlet of the yarn withdrawal channel. It may be arranged in a fixed position adjacent to the outlet of the thread withdrawal channel so as to do so.

According to another advantageous development of the invention, it is specified that the fluid supply device is configured to atomize the fluid. According to this preferred embodiment of the invention, the fluid supply device can be used to supply fluid as an aerosol in front of the outlet of the thread withdrawal channel or to introduce it into the outlet of the thread withdrawal channel, whereby the A particularly good distribution of the fluid inside the spinning device is achieved while reducing the fluid required for surface treatment.

According to another advantageous embodiment of the invention, the supply line is connected to a yarn preparation unit which is downstream of the outlet of the yarn withdrawal channel in the direction of yarn travel. According to this preferred embodiment of the invention, the supply of fluid into the pneumatic spinning device takes place by supplying fluid into a yarn preparation unit which is downstream of the yarn withdrawal channel, the yarn preparation unit being supplied with fluid into the air spinning device. Recall of the generally wound yarn end into the corresponding winding package after interruption of the spinning process due to tearing of the spun sliver or due to detachment of the spun yarn by controlled cutting of the yarn clearer and serves to feed the air spinning device, within which the spinning start process and the subsequent spinning steps are then carried out.

Depending on the intended use, the fluid is a cleaning fluid which has the effect of cleaning the internal surfaces of the pneumatic spinning device or which directly or indirectly affects the fiber or yarn properties of the pneumatic spinning device. It is an additive that has the effect of influencing the surface as required in contact with the surface. The composition of such cleaning fluids, which may in particular have water or air/water mixtures or other compositions, and the composition of the additives, which are already known, for example from EP 2 730 695, are known from the prior art. A detailed description of the corresponding compositions is omitted, since they are well known based on the invention and are not the subject of the present invention.

Embodiments of the present invention will be described below with reference to the drawings.

1 is a schematic representation of a first embodiment of an air spinning device with a drafting device installed upstream; FIG. FIG. 2 is a schematic representation of a second embodiment of the air spinning device with an upstream drafting device; 1 is a schematic illustration of a yarn preparation unit downstream of the air spinning device in the yarn running direction; FIG.

In order to provide a general understanding of the functioning of the pneumatic spinning device 2, FIG. 1 shows the basic structure of a drafting device 1 together with a downstream pneumatic spinning device 2. A sliver (not shown) drawn from a sliver source (not shown) is drawn in by an inlet roller pair formed by an inlet top roller 26 and an inlet bottom roller 27 . The sliver is then transferred to a second drafting device top roller 28 and a second drafting device bottom roller 29, a third drafting device top roller 24 and a third drafting device bottom roller 25, and then to a subsequent exit top roller. 22 and an exit roller pair consisting of an exit bottom roller 23. The drawn sliver then passes through the inlet area 12 of the sliver introduction unit and the downstream nozzle device 6 into the air spinning device 2 and is then spun in the air spinning device 2. It is formed into a thread using a cone 5 and a nozzle device 6. The pneumatic spinning device 2 has a multi-part spinning housing 13, which comprises a first spinning housing segment comprising an inlet area 12 and a nozzle arrangement 6, and a first spinning housing segment having a spinning cone 5. 2 spinning housing segments. The first spinning housing segment and the second spinning housing segment are configured to move relative to each other along the yarn running direction in order to open the air spinning device 2, thereby causing the spinning cone to open. 5 is exposed in the open state of the air spinning device 2 or the spinning housing 13 and is accessible from the outside of the spinning housing 13.

The nozzle arrangement 6 has nozzles 7 , 8 , both nozzles 7 , 8 being connected via a line 9 to a compressed air source 10 . The air exiting the nozzles 7, 8 generates a swirling air stream which is applied to the drawn sliver. The air flow then flows around the spinning cone 5 in an enclosing gap 15 between the spinning cone 5 and a spinning housing 13 that is arranged coaxially with respect to the spinning cone 5 and surrounds the spinning cone 5; This acts on the drawn sliver. In the air spinning device 2, the outer wound fibers of the sliver are wound around the core fibers located inside the sliver due to the air vortices present in the surrounding gap 15 inside the air spinning device 2, so that , ensuring the desired strength of the yarn. The yarn thus formed is then passed through the air spinning device 2 via the outlet 17 of the yarn withdrawal channel 3, which extends in the yarn running direction R from the inlet 4 of the spinning cone 5 to the outlet 17 of the spinning cone 5. drawn from.

In order to treat the internal surface of the air spinning device 2 in the closed state, the air spinning device 2 shown in FIG. During the spinning process or during interruptions in spinning, a fluid, for example a cleaning liquid or an additive, is supplied as an aerosol via the supply line 14 and the nozzle 16 in front of the outlet 17 of the thread guide channel 3 . In order to introduce fluid into the pneumatic spinning device 2 , the nozzle device 6 is actuated temporally before or during the supply of fluid at the outlet 17 , so that a spinning pressure is generated inside the pneumatic spinning device 2 . , due to this spinning pressure, a negative pressure is generated at the inlet 4 of the spinning cone 5 due to the rotating air flow in the surrounding gap 15 between the spinning cone 5 and the spinning housing 13, so that the fluid flows through the outlet 17. The thread is then guided through the thread guide channel 3 to the inlet of the spinning cone 5 and from there into the expansion chamber 19 . The fluid treats or is supplied to the internal surfaces of the pneumatic spinning device 2 in this flow. Due to the spinning pressure, the fluid reaches into the expansion chamber 19, from which it can be discharged, for example together with contaminants dislodged from the surface, via an outflow channel 20.

The activation of the nozzle device 6, which also takes place temporally after the end of the introduction of the fluid, dries the surfaces inside the air spinning device 2 that have been treated with the fluid.

FIG. 2 shows another embodiment of a pneumatic spinning device 2, which differs from the pneumatic spinning device 2 shown in FIG. 1 in the following respects. Thus, in the pneumatic spinning device 2 shown in FIG. 2, the fluid supply device 11b has a particularly flexible supply line 14, at the free end of which a connecting element 18 is arranged. By means of this connecting element 18 , the supply line 14 can be directly connected in a liquid-tight manner to the outlet 17 of the thread withdrawal channel 3 . This allows fluids, for example cleaning liquids or additives, to be introduced directly into the thread withdrawal channel 3 via the connecting element 18 . For a liquid-tight arrangement, the connecting element 18 has a conical shape according to this preferred embodiment, which conical shape is formed in or on the outlet 17. It is operatively connected to a conical receptacle, for example in the form of a sealing lip.

FIG. 3 schematically shows a yarn deflection unit 30 optionally downstream of the pneumatic spinning device 2, which yarn deflection unit 30 is connected via a yarn guide channel 32 to its outlet 33. and is connected to the yarn preparation unit 31. The air spinning device 2, the yarn deflection unit 30 and the yarn preparation unit 31 with the yarn guide channel 32 are components of a spinning unit (not shown) of the air spinning machine. In an air spinning machine, during the spinning process, the yarn emerging from the air spinning device 2 is wound up to form a wound package (not shown).

During the normal spinning process, the yarn produced in the air spinning device 2 is drawn out from the air spinning device 2 and supplied to the winding package via the yarn deflection unit 30, the yarn guide channel 32 and the yarn preparation unit 31, The yarn is wound onto this winding package. If spinning is interrupted, for example due to a yarn breakage or controlled cutting of an already spun yarn, a spinning start step must first be carried out before the spinning process can be restarted. In order to carry out the spinning start process, it is usually necessary to place the end of the already finished yarn, which is in the winding package, again in the region of the sliver in the air spinning device 2.

For this purpose, a yarn transfer device (not shown) is usually used to recall the yarn ends of the already produced yarn from the winding package, and an air spinning device configured with a holding and untwisting tube 34 is used. 2 into the yarn preparation unit 31 disposed downstream in the yarn running direction R, and the yarn ends are sufficiently untwisted in the holding/untwisting tube 34 with the yarn clamped to create a loose form. Fibers can be removed. For this purpose, an injection nozzle (not shown) is provided in front of the holding/untwisting tube 34 in the yarn running direction R, and compressed air can be supplied to the yarn guide passage 32 via this injection nozzle. An air vortex opposite to the yarn running direction R can be generated in order to untwist the yarn ends in the region of the holding and untwisting tube 34. The untwisted and prepared yarn is reliably fed to the outlet 17 of the air spinning device 2 via the passage 35 when compressed air is present in the yarn guide channel 32 .

In order to introduce fluid into the outlet 17 of the air spinning device 2, the yarn guide channel 32 of the yarn preparation unit 31 is connected to a fluid supply device 11c, with which fluids, for example cleaning liquid or additives, can be introduced. The agent can be fed into the yarn guide channel 32 of the yarn preparation unit 31 via the supply line 14 and the nozzle 16, for example in sprayed form. If compressed air is present in the yarn guide channel 32 and spinning pressure is present in the air spinning device 2 after the interruption of the spinning process, the compressed air flow present in the yarn guide channel 32 entrains fluid and the negative pressure present in the thread withdrawal channel 3 introduces fluid into the outlet 17 of the thread withdrawal channel 3. As a result, the inner surface of the air spinning device 2 is treated as described above.

1 Draft device 2 Air spinning device 3 Yarn withdrawal passage 4 Spinning cone inlet 5 Spinning cone 6 Nozzle device 7 Nozzle 8 Nozzle 9 Pipe line 10 Compressed air source 11a, 11b, 11c Fluid supply device 12 Inlet area 13 Spinning housing 14 Supply line 15 Surrounding gap 16 Nozzle 17 Outlet 18 Connecting element 19 Expansion chamber 20 Outflow passage 22 Outlet top roller 23 Outlet bottom roller 24 Third drafting device top roller 25 Third drafting device bottom roller 26 Inlet top roller 27 Inlet bottom roller 28 2 drafting device top roller 29 2nd drafting device bottom roller 30 Yarn turning unit 31 Yarn preparation unit 32 Yarn guide path 33 Outlet 34 Holding/untwisting tube 35 Penetration path R Yarn running direction

Claims (12)

A method for surface treating the inside of an air spinning device (2), the method comprising:
The air spinning device (2) includes:
- a yarn withdrawal channel (3) across the spinning cone (5), with an outlet (17) for removing the spun yarn from said air spinning device (2);
- a spinning housing (13) spaced from and surrounding the spinning cone (5);
- supplying compressed air for generating an air flow around the spinning cone (5) in an enclosing gap (15) between the spinning cone (5) and the spinning housing (13); During the spinning process or during interruption of the spinning process,
- supplying fluid in front of said outlet (17) or introducing it into said outlet (17) on the outlet side;
- A method, characterized in that the nozzle device (6) is used to generate an air flow that flows around the spinning cone (5) in the surrounding gap (15). 2. Method according to claim 1, characterized in that the fluid is sprayed before being fed into or in front of the thread withdrawal channel (3). Claim 1, characterized in that the fluid is introduced into the yarn withdrawal channel (3) via a supply line (14) connectable to the outlet (17) of the yarn withdrawal channel (3). Or the method described in 2. Claim characterized in that the fluid is supplied to the thread withdrawal channel (3) via a supply line (14) terminating adjacent to the outlet (17) of the thread withdrawal channel (3). The method described in any one or more of items 1 to 3. Claim 1, characterized in that the fluid is led out via an expansion chamber (19) adjacent to the surrounding gap (15) and an outflow channel (20) connected to the expansion chamber (19). The method described in any one or more of the following items. From claim 1, characterized in that the fluid is supplied in the region of a yarn preparation unit (21) downstream of the outlet (17) of the yarn withdrawal channel (3) in the yarn withdrawal direction (R). 5. The method described in any one or more of the items up to 5. 7. Method according to one or more of the preceding claims, characterized in that an air flow is generated in the surrounding gap (15) before or at the beginning of the introduction of the fluid. Method according to one or more of claims 1 to 7, characterized in that the air flow is maintained at least temporarily in the surrounding gap (15) even after the introduction of the fluid has ended. . An air spinning device (2),
- a yarn withdrawal channel (3) across the spinning cone (5), with an outlet (17) for removing the spun yarn from said air spinning device (2);
- a spinning housing (13) spaced from and surrounding the spinning cone (5);
- supplying compressed air for generating an air flow around the spinning cone (5) in an enclosing gap (15) between the spinning cone (5) and the spinning housing (13); Equipped with a nozzle device (6) that can
characterized in that it comprises a fluid supply device (11a, 11b, 11c) configured to supply fluid in front of said outlet (17) on the outlet side or to introduce fluid into said outlet (17). , air spinning device (2). The fluid supply device comprises a supply conduit (14) connectable to and/or disposed adjacent to the outlet (17) of the thread withdrawal passageway (3). ) Air spinning device (2) according to claim 9, characterized in that it has a. Air spinning device (2) according to claim 9 or 10, characterized in that the fluid supply device (11a, 11b, 11c) is configured to spray the fluid. The supply pipe (14) is connected to a yarn guide passage of the yarn preparation unit (31) which is located downstream of the outlet (17) of the yarn withdrawal passage (3) in the yarn running direction. An air spinning device according to any one or more of claims 9 to 11.