Apparatus for producing plurality of filaments

Abstract

The invention relates to a device for producing a plurality of filaments, the plurality of filaments forming a thread (17), and to a method for producing a plurality of filaments, having a spinning assembly (21) in a spinning manifold (2), the spinning assembly having a plurality of capillaries (22) for extruding a plurality of filaments (13) and a cooling well (1) for guiding the filaments therethrough, and having a volumetric flow suction device (20) which interacts with the cooling shaft such that a volumetric flow (30) can be provided at the spinning assembly (21) around a capillary envelope (24) of the plurality of capillaries (22), the volumetric flow suction device (20) being configured to provide the volumetric flow (30) at the capillary envelope (24) at a constant suction pressure (P3).

Description

Technical Field

[0001] The present invention relates to an apparatus for producing a plurality of filaments forming a yarn, and a related method for producing a plurality of filaments forming a yarn. Background Art

[0002] For the production of synthetic yarns, it is generally known that a plurality of slender filament strands are extruded from a polymer melt through a plurality of capillaries of a spinning assembly. During this process, the filament strands form a bundle, which merges to form a yarn after cooling. In order to prevent the filament strands within the yarn assembly from sticking together, the filament strands must be cooled after the extrusion process and before they solidify. The filament strands are typically cooled by a cooling stream impinging on the filament strands. However, it is necessary to cool all the filament strands within the filament bundle as uniformly as possible in order to obtain as uniform physical properties as possible.

[0003] The prior art has disclosed many apparatuses for cooling freshly extruded filament strands, which can be basically divided into several groups in terms of the generation of the cooling air flow.

[0004] One group relates to cross-flow blow quenching. An example in this regard can be found in DE 4 404258A1. In this document, a laterally directed cooling stream is guided onto the extruded filament strands.

[0005] This cooling device has a relatively good cooling effect, but has a fundamental drawback that the filament bundle is only impinged by the cooling stream on one side.

[0006] Another form of cooling is also known as radial blow quenching.

[0007] US5219582A describes such a radial blow quenching device, in which the filament bundle is guided within a cylindrical cooling shaft having a permeable wall and arranged in a blow quenching chamber. The cooling air conducted in the blow quenching chamber enters the cooling shaft from the outside to the inside through the permeable wall in order to cool the filament strands.

[0008] The drawback of this radial blow quenching device is that the discharge direction of the cooling stream is the same as the direction of the yarn material in the traveling direction. Especially in the case of radial blow quenching, the cooling effect is reduced because a sheath flow is formed around the filament strands, which insulates the filament strands from the cooling air and can prevent the filament strands from contacting the cooling air.

[0009] Another cooling variant known in the prior art is to generate a cooling stream opposite to the traveling direction of the yarn material.

[0010] Here, for example, a negative pressure suction device is used. Such a device is known, for example, from DE 11 19456 B. This document discloses a so-called cooling cylinder which has extraction means acting in the region of the spinning nozzle and the cooling cylinder.

[0011] However, the extraction means generate undesired air turbulence which has an adverse effect on the uniformity of the filament strand cooling.

[0012] To counteract this air turbulence, so-called suction chambers are known which are supplied via a negative pressure chamber concentrically surrounding the cooling cylinder, for example from DE 10 2021 000 436 A1. Here too, a high negative pressure is required which has to be generated by the suction chambers in order to be able to cool the filaments in the cooling shaft in the first place. Such a cooling device has also proven to be unreliable. SUMMARY OF THE INVENTION

[0013] The object of the present invention is to provide a device and a method which are capable of gently cooling a plurality of synthetic yarns.

[0014] According to the present invention, as far as the device is concerned, this object is achieved by the device.

[0015] According to one aspect of the present invention, there is provided a device for producing a plurality of filaments forming a yarn, the device having a spinning assembly located in a spinning box, the spinning assembly having a plurality of capillaries for extruding a plurality of filaments and a cooling well for guiding the filaments, and having a volume flow suction device interacting with a cooling shaft such that a volume flow can be provided in a capillary envelope region around the plurality of capillaries at the spinning assembly, wherein the volume flow suction device is configured to provide a volume flow at a constant suction pressure in the capillary envelope region.

[0016] The volume flow suction device should be understood as a suction device which allows volumetric suction of air, which can in particular be carried out without turbulence. This is carried out on the basis of providing a constant suction pressure.

[0017] The capillary envelope region is the region in the spinning assembly where the filaments are extruded from the spinning assembly and first come into contact with the surrounding environment.

[0018] The constant suction pressure should be understood as the pressure present at the location of the capillary envelope region. The volume flow suction device generating the suction pressure can be located at a predetermined distance from the suction point.

[0019] The advantage of volumetric suction is that it is independent of external air pressure fluctuations, since the volume flow suction device for volumetric suction can be regarded as a closed system. A major advantage is that almost any desired volume flow can be extracted without external influence.

[0020] Depending on the volume flow generated, a flow without turbulence or with low turbulence is generated.

[0021] Furthermore, volume extraction should in particular be understood as generating a volume flow with a low-value pressure, which can be carried out with low turbulence and almost complete absence of turbulence. In the case of unthrottled suction, the value of the low pressure may be in the range of substantially 0.01 to 0.1 kPa, and in the case of throttled suction, the value may be in the range of 0.2 kPa to 3 kPa. In the case of throttled suction, throttling means that a higher suction value is required to generate the same volume flow compared to unthrottled suction.

[0022] In an improvement of the present device, the volume flow suction device has a fan device configured to generate a constant suction pressure.

[0023] This provides the advantage of being able to provide a volume flow with a relatively low-value pressure as described above, and can respond quickly to pressure fluctuations as needed, and can avoid uneven cooling of the filament.

[0024] Air pressure fluctuations can cause adverse cooling of the filament, which can affect the further processing and quality of the filament.

[0025] In an improvement of the present device, the fan device has a rotatable fan rotor having a plurality of rotor blades configured such that the suction pressure can be directly proportionally controlled based on the rotational speed of the fan rotor.

[0026] This provides the advantage that the generated volume flow can be directly inferred from the rotational speed of the fan rotor, and rapid feedback control can be performed, so that pressure fluctuations in the suction pressure can be immediately compensated.

[0027] In a further improvement of the present device, the volume flow suction device has a throttling device for setting the suction volume flow, and the throttling device is located upstream of the fan device in the suction direction.

[0028] This has the advantage that the volume flow can be set more precisely by throttling, and thus the suction pressure can be set more precisely. The fan characteristics of the fan device can also be considered, which can further improve the feedback control of the suction pressure.

[0029] Furthermore, volume extraction can be performed independently of the ambient pressure because the conveyance is performed in a closed system in which displacement elements (such as the rotor blades of a fan) perform periodic volume changes in a working space provided for them and which can be delimited with respect to inflow and outflow by a separating element (such as by a throttling device). Therefore, the suction on the volume is not affected by the ambient pressure either, because the system is essentially closed and the flow can be generated independently of the ambient pressure.

[0030] In a further improvement of the device, the throttling device has a fixed throttling action and / or an adjustable throttling action, wherein the suction gas volume flow rate can be controlled and / or adjusted by the throttling device.

[0031] The throttling device can have a fixed, non-adjustable throttling action. Then the suction pressure is basically regulated by the fan device.

[0032] The throttling device can have an adjustable throttling action. In this case, the suction pressure can be basically regulated by the fan device and / or in interaction with the fan device.

[0033] In another improvement of the device, the volumetric flow suction device has a heat exchanger for heat dissipation.

[0034] This has the advantage that the temperature can also be regulated and the surroundings can also be selectively climate-controlled.

[0035] In a further improvement of the device, the first sensor device is located near the capillary envelope area, wherein the data detected by the first sensor device is transmitted for the feedback control of the fan device and / or for the feedback control of the throttling device.

[0036] To allow the feedback control of the fan device and / or the throttling device, sensor devices are provided at relevant positions in the device for producing synthetic filaments. Data related to the feedback control of the fan device, the feedback control of the throttling device, and / or the feedback control of the heat exchanger can be detected by appropriate sensor devices. Then, using the detected data, the sensor device, the throttling device, and / or the heat exchanger can be adjusted by the controller, so that a constant suction pressure can be provided.

[0037] In another improvement of the device, the second sensor device is arranged at the cooling shaft and / or the third sensor device is arranged at the cooling well.

[0038] Other sensor devices can also be provided at the cooling well. This allows the detection of additional data, using which the regulation of the fan device and / or the throttling device can be improved.

[0039] In an improvement of the device, the first sensor device, the second sensor device, and / or the third sensor device are configured to detect pressure (especially air pressure), to detect temperature (especially ambient temperature), and / or to detect humidity (especially air humidity).

[0040] The sensor device may be equipped with sensors, all of which may be relevant to the feedback control of the volumetric flow aspiration device. The volumetric flow aspiration device may have a fan device, a throttle device, and / or a heat exchanger. Depending on the implementation combination of the fan device, the throttle device, and the heat exchanger in the volumetric flow aspiration device, each sensor may become relevant and be provided when necessary.

[0041] In a particular improvement, the fan device may also have an additional rotational speed sensor so that the volumetric flow can be adjusted by the rotational speed. The rotational speed can also be detected and determined from the energy consumption of the drive of the fan device.

[0042] In a further improvement, the data detected by the first sensor device, the second sensor device, and / or the third sensor device is evaluated for the feedback control of the fan device and / or for the feedback control of the throttle device and / or for the feedback control of the heat exchanger.

[0043] This provides the advantage that in addition to cooling the filaments, the climate of the entire plant where the equipment is located can also be controlled.

[0044] According to the present invention, this object is achieved by the method described above.

[0045] According to another aspect of the present invention, a method for producing a plurality of filaments forming a yarn is provided, in which the synthesized filaments are extruded from a plastic melt through a spinning assembly along the filament travel direction, and the extruded filaments are cooled in a cooling well by a volumetric flow flowing in a direction opposite to the filament travel direction towards the spinning assembly, and the volumetric flow is guided to a capillary envelope region and provided at a constant aspiration pressure in the capillary envelope region.

[0046] This provides the advantage that no pressure fluctuations occur during filament cooling, and the cooling effect is improved.

[0047] In a further improvement of the method, the aspiration pressure is monitored in the capillary envelope region, and the feedback control of the volumetric flow is performed based on the detected aspiration pressure.

[0048] This provides the advantage that a uniform and non-turbulent cooling can be provided.

[0049] In a further improvement of the method, the volumetric flow is provided substantially in the range of 1 - 15 (m 3 air) / (kg filament).

[0050] This has the advantage that the method that can be used in the equipment can be optimally configured for the cooling of each filament. The total volume of the volumetric flow for cooling the filaments is taken from the environment in which the equipment and the method are implemented.

[0051] In a specific refinement of the method, in the absence of throttling control / feedback control, the value of the suction pressure of the volume flow is essentially in the range from 0.01 to 0.1 kPa.

[0052] This is particularly advantageous if the feedback control of the volume flow is effected essentially by means of a fan device. In this case, a relatively small pressure difference suffices, since the direction of flow of the volume flow for cooling the filaments is opposite to the direction of travel of the filaments.

[0053] In another specific refinement of the method, in the case of throttling control / feedback control, the value of the suction pressure of the volume flow is in the range from 0.2 to 3 kPa.

[0054] In particular in the case where a throttling device is provided, a higher suction pressure is required, since the throttling device reduces the volume flow rate to the required volume flow and the required suction pressure. Description of the Drawings

[0055] The device according to the invention and the method according to the invention for producing a plurality of filaments forming a yarn will be discussed in more detail below on the basis of a number of exemplary embodiments and with reference to the drawings.

[0056] In the drawings:

[0057] Figure 1 is a schematic cross-sectional view of a radial blowing quenching device, showing the external pressure and the internal pressure at the cooling well of circular cross-section,

[0058] Figure 2 is a schematic cross-sectional view of a radial blowing quenching device and a monomer extraction device, showing the external pressure and the internal pressure at the cooling well of circular cross-section and showing the extraction pressure at the capillary envelope region,

[0059] Figure 3 is a schematic cross-sectional view of a radial suction device according to the invention, showing the external pressure and the internal pressure at the cooling well of circular cross-section produced by means of a volume suction device according to the invention,

[0060] Figure 4 is a schematic cross-sectional view of a first, second and / or third exemplary embodiment of a volume suction device according to the invention, having a fan device, a throttling device and / or a heat exchanger,

[0061] Figure 5 is Figure 4 a top view of the volume suction device shown in

[0062] Figure 6 for a predetermined number of spinning assemblies, and

[0063] List of Reference Numerals

[0064] 1 Cooling well

[0065] 2 Spinning box

[0066] 3 Filament outlet

[0067] 4 Channel section

[0068] 5 Wall section

[0069] 6 Filament inlet

[0070] 7 Heat dissipation section

[0071] 8 Heat exchange pipeline

[0072] 9 Heat exchanger

[0073] 10 Conveying housing

[0074] 11 Flow channel

[0075] 12 Fan device

[0076] 13 Filament

[0077] 14 Air outlet

[0078] 15 Air outlet pipeline

[0079] 16 Extraction device

[0080] 17 Yarn

[0081] 18 Convergence point

[0082] 19 Throttling device

[0083] 20 Volume suction device

[0084] 21 Spinning component

[0085] 22 Capillary

[0086] 24 Capillary envelope area

[0087] 26 Fan rotor

[0088] 27 Rotor shaft

[0089] 28 Rotor blade

[0090] 29 Rotor housing

[0091] 30 Volume flow

[0092] 33 First pressure sensor

[0093] 35 Second pressure sensor (external pressure sensor)

[0094] 38 First pressure sensor (internal pressure sensor)

[0095] 40 Co-current direction

[0096] 110 Driving device

[0097] P1 First pressure, external pressure

[0098] P2 Second pressure, internal pressure

[0099] P3 Third pressure, suction pressure

[0100] A Suction area

[0101] D Throttle area

[0102] W Heat dissipation area

[0103] AS Suction gas volume flow

[0104] F Filament traveling direction Detailed implementation mode

[0105] In Figure 1 、 Figure 2 、 Figure 3 and Figure 4 a reference coordinate system is indicated in a specific view, and the reference coordinate system has X, Y, and Z directions extending in the respective main extension directions of the device shown in the specific figure.

[0106] In Figure 1 the reference coordinate system XYZ indicates the longitudinal extension of the device for creating a plurality of filaments 13 in the X direction, where the Y direction indicates the depth extension of the device and the Z direction indicates the height extension of the device.

[0107] In Figure 5 the reference coordinate system XYZ is drawn on the top view of the device having a spinning box and a volume suction device 20 according to the present invention, where the reference coordinate system indicates the longitudinal extension direction of the volume flow suction device 20 in the X direction, the depth extension of the volume flow suction device 20 in the Y direction, and the height direction of the volume flow suction device 20 in the Z direction.

[0108] By using the volume flow suction device 20 according to the present invention, a uniform volume flow 30 with a constant pressure can be provided. This can be achieved by: using the volume flow suction device 20 according to the present invention, the volume flow 30 is achieved by the rotational speed of the fan rotor 26 and / or by a throttle device 19 assisting this, so that a constant volume suction can always be preferably performed based on main environmental parameters (such as pressure, temperature, and / or humidity).

[0109] Figure 1 The spinning assembly 21 adjacent to the cooling well 1 with a perforated outer wall is shown in a schematic cross-sectional view. A plurality of filaments 13 can be extruded from the spinning assembly 21 along the filament travel direction F. The path of the cooling flow direction is also indicated by the curved arrow 40. The cooling flow direction travels along the filament travel direction F in the co-current direction 40 and thus must have a speed higher than the discharge speed of the filaments 13 in the filament travel direction F. Therefore, the external pressure P1 outside the cooling well is higher than the internal pressure P2.

[0110] The external pressure P1 is generated by a corresponding pressure device that forces the ambient air outside the cooling well to flow inward through the perforated outer wall. The perforations and the filaments 13 cause the external pressure P1 to be reduced to the internal pressure P2.

[0111] Since the cooling air has a high speed in the filament travel direction F of the filaments 13, the filaments 13 are cooled.

[0112] In addition to Figure 1 the cooling shown in the figure is carried out through the perforated outer wall of the cooling well 1 in the co-current direction 40 along the filament travel direction F, Figure 2 the monomer extraction occurring in the capillary zone 24 is also shown. The monomer should preferably be extracted in the capillary envelope zone 24. For this purpose, a suction pressure P3 is generated. The suction pressure P3 is approximately equal to the internal pressure P2 in the cooling well, and here also the external pressure P1 is higher than the internal pressure P2.

[0113] The monomer extraction preferably only has the function of extracting any formed monomer and does not provide or intend to cool the filaments 13.

[0114] Figure 3 A volumetric suction device according to the present invention is shown in a schematic cross-sectional view. The volumetric flow suction according to the present invention is carried out by a volumetric flow suction device 20 that sucks in ambient air.

[0115] The volumetric flow suction device 20 can have a fan device 12 for generating a volumetric flow 30, a throttling device 19 for throttling the volumetric flow 30, and / or a heat exchanger 9 for heat dissipation, for example Figure 4 and Figure 5 as shown in the figure.

[0116] In addition, in the first exemplary embodiment of the present device, the volumetric flow suction device 20 only has the fan device 12; in the second exemplary embodiment, it can have a combination of the fan device 12 and the throttling device 19 without the heat exchanger 9; and / or in the third exemplary embodiment of the present device, it can have a combination of the fan device 12 and the heat exchanger 9.

[0117] The aspiration of the ambient air is preferably effected via the capillary envelope region 24 at the spinning assembly 21. This gives rise to a volume flow 30 as Figure 3 shown, as indicated by the reference numeral 30 and the arrowed line. The direction of the volume flow 30 is opposite to the filament travel direction F. This has the advantage that the velocity of the volume flow 30 in the volume flow direction 30 can be lower than the velocity of the filaments in the filament travel direction F, while at the same time a better cooling effect can be achieved, since the flow direction of the volume flow is opposite to the filament travel direction F and exhibits a greater velocity difference than the co-current direction 40.

[0118] In addition, since the aspiration also takes place in the capillary envelope region 24, it is also possible to aspirate harmful gases and foreign bodies (such as monomers), which are encountered in particular in the case of synthetic filaments 13 made of PA66.

[0119] In addition, the aspiration can also discharge the heat entrained in the ambient air, so that in addition to merely cooling the filaments, harmful substances can be additionally aspirated and heat can be discharged into the ambient air in the hall.

[0120] The volume aspiration device 20 according to the invention can not only effect cooling, but can also effect climate control of the environment in which the volume flow aspiration device 20 and the cooling well 1 with the spinning assembly 21 are located. For this purpose, the volume flow aspiration device 20 can have a heat exchanger 9.

[0121] In order to cool the filaments 13, it is thus sufficient to achieve a very small volume flow 30, which is at the same time easy to keep constant, since the volume flow aspiration device 20 according to the invention permits simple control and feedback control of the volume flow rate, and moreover permits the volume flow and the associated aspiration pressure P3 to be kept constant over a relatively long period of time, and the flow direction of the volume flow rate 30 is opposite to the filament travel direction F.

[0122] Figure 3 The pressure conditions at the cooling well are also indicated in. The external pressure P1 around the cooling well is equal to the internal pressure P2 in the cooling well, where the aspiration pressure P3 caused by the volume flow aspiration device 20 is higher than the internal pressure P2 in the cooling well 1.

[0123] Figure 4 The apparatus for producing a plurality of filaments 13 is shown in a schematic sectional view, in particular the spinning assembly 21 arranged in the spinneret housing 2.

[0124] In addition, Figure 4 various exemplary embodiments of the volume flow aspiration device 20 are shown which can be implemented individually and / or in different combinations.

[0125] In addition to the fan device 12, a throttling device 19 can also be provided, which can also be used to keep the aspirated volume flow constant.

[0126] In Figure 4 the exemplary embodiment shown, the volumetric suction device 20 can be divided into three zones. They are a suction zone A where the fan device 12 is arranged, a throttling zone D where the throttling device 19 is arranged, and a heat dissipation zone W where the heat exchanger 9 is arranged.

[0127] With the help of the heat exchanger 9, the heat that can be extracted by the ambient air can be exchanged or discharged from the hall where the device is arranged in order to achieve the corresponding climate control.

[0128] The feedback control of the throttling device 19 and / or the fan device 12 can be assisted by sensors / sensor devices 33, 35, 38 located at relevant positions. For example, a first pressure sensor 33 can be provided in the region of the capillary envelope zone 24, so that the suction pressure P3 can be monitored and the feedback control of the fan device 12 can be performed as needed.

[0129] The data from the first pressure sensor 33 can also be used for the feedback control of the throttling device 19.

[0130] In addition, a second pressure sensor 38 can be provided, which measures the internal pressure P2 in the cooling well, and / or a third pressure sensor 35 can be provided, which detects the external pressure P1. The data from the first pressure sensor 33, the second pressure sensor 38, and the third pressure sensor 35 can be used to control and / or perform feedback control on the fan device 12 and / or the throttling device 19.

[0131] The throttling device 19 can have a rigid throttling device and / or a flexible throttling device. In the case of a rigid throttling device, the required data is pre-detected and then stored unchanged during factory operation.

[0132] Figure 4 The first, second, and third exemplary embodiments of the device for producing a plurality of filaments 13 that form a yarn 17 are shown in a schematic cross-sectional view of a side elevation. The device has a spinning box 2, in which a spinning assembly 21 is arranged. The spinning assembly has a plurality of capillaries 22, through which a plastic melt is extruded to form a plurality of filaments 13, and these filaments merge at a convergence point 18 to form a yarn 17.

[0133] To sufficiently cool the plurality of filaments 13, a cooling well 1 is arranged near the spinning box 2.

[0134] The cooling well 1 has a filament inlet 6 and a filament outlet 3. The filaments 13 are fed from the spinning box 2 into the cooling well through the filament inlet 6, and the filaments leave the cooling well 1 through the filament outlet 3. The cooling well 1 preferably has a substantially rectangular cross-section, but may also have a substantially circular cross-section.

[0135] The cooling well 1 also has a wall portion 5. In the exemplary embodiment shown, the cooling well 1 can be either air-permeable or air-impermeable. The wall portion 5 is air-impermeable. The wall portion 5 is adjacent to the air-permeable channel portion 4 such that ambient air can also be drawn in via the channel portion 4 by the fan device 12 in order to cool the plurality of filaments 13.

[0136] The advantage of the air-impermeable wall portion 5 is that the relative volume flow 30 drawn in by the volumetric suction device 20 flows substantially parallel to the filament travel direction F. As Figure 1 shown, the flow direction of the relative volume flow 30 is opposite to the filament travel direction F, which also helps to cool the plurality of filaments 13.

[0137] The volumetric flow suction device 20 is configured such that the ambient pressure P1 is equal to the internal pressure P2 in the cooling well. This has the advantage that the reverse flow flows against the filaments 13 in a low-turbulence or almost non-turbulent manner.

[0138] This helps the filaments to solidify towards the convergence point 18 where the plurality of filaments 13 merge to form the yarn 17. At the convergence point 18, a so-called spinning finish can also be applied, which is a liquid composed of an emulsion of water and oil that promotes sliding, reduces friction and inhibits electrostatic charging.

[0139] The internal pressure P2 in the cooling well is lower than the suction pressure P3 generated by the volumetric suction device 20.

[0140] In order to reduce or avoid heat transfer from the spinning box 2 to the volumetric flow suction device 20, the flow channel 11 can be equipped with a heat dissipation portion 7 which is connected to a heat exchanger 9 via a heat exchange pipeline 8 in order to discharge or reduce any introduced heat.

[0141] The volumetric flow suction device 20 has a delivery housing 10 that houses the fan device 12. The fan device 12 is connected to the spinning box 2 via the flow channel 11.

[0142] The delivery housing 10 of the fan device 12 also has an air outlet 14. An extraction device 16 can be connected to the air outlet 14 through which the relative flow 30 volumetrically drawn in by the volumetric suction device 20 is separately extracted and discharged from the volumetric suction device 20 through an air outlet pipeline 15, where "separately" should be understood here as the extraction device 16 not affecting the delivery rate of the volumetric suction device 20.

[0143] The ambient air drawn in by the fan device 12 is guided through the air outlet pipeline 15 to the extraction device 16, where the air outlet pipeline is fluid-tightly coupled to the air outlet 14 of the delivery housing 10.

[0144] Figure 5 Is shown in a schematic top view Figure 1The spinning cabinet 2 therein, the spinning cabinet having a plurality of spinning components 21. In the illustrated embodiment, each spinning cabinet 21 is assigned a fan device 12 accommodated in the conveying housing 10.

[0145] Other exemplary embodiments with a throttling device 19 and / or a heat exchanger 9 are also shown.

[0146] Figure 5 A volume suction device 20 with a fan device 12 is shown in a top view.

[0147] In one of the exemplary embodiments shown in this figure, the fan device 12 has a fan rotor 26, which has a plurality of blades 28. These rotor blades can be moved by the rotor shaft 27 and are mounted in the rotor housing 29. The detection and feedback control of the inhaled air can be performed proportionally based on the rotational speed of the rotor shaft 27.

[0148] To assist with this, in a second exemplary embodiment, a throttling device 19 can be provided, which helps to keep the inhaled volume flow 30 constant.

[0149] Furthermore, in a third exemplary embodiment, each flow channel 11 can have a heat dissipation section 7, which is connected to the heat exchanger 9 through a heat exchange pipeline 8.

[0150] In an exemplary embodiment not shown, the heat dissipation section 7 can also be formed in the common flow channel 11.

[0151] The volume flow suction device 20 can also have a single fan device for a plurality of spinning components 21. Then, the reverse flow of each spinning component in the cooling well 1 is individually controlled by the associated throttling device 16. For this purpose, corresponding guide plates can be provided, which act as fixed throttling devices. Through the guide plates, the reverse volume flow 30 can be throttled to the required level without generating an excessive pressure difference relative to the ambient pressure P1 in the cooling well 1 with the cooling well pressure P2.

[0152] As shown, the fan device 12 can be driven by a common drive device 110 to generate a corresponding reverse flow 30.

[0153] The fan device 12 can have a corresponding gearbox, through which the associated conveying rate can be individually adjusted. In an embodiment not shown, each fan device 12 can also have its own drive device 110.

[0154] The reverse flow 30 volume-sucked by the fan device 12 is conveyed to the air outlet 14. The air outlet 14 can be connected to an air outlet pipeline 15, but this does not affect the conveying rate of the fan device 12.

[0155] Figure 6 shows a schematic block diagram showing the individual method steps of a method for producing a yarn 17 from a plurality of filaments 13.

[0156] In a first step S1, the synthetic filaments 13 are extruded from a plastic melt through a spinning assembly 21 in the filament travel direction F (S1).

[0157] In a second step S2, the extruded filaments 13 are cooled in a cooling well 1 by a volume flow 30 (S2), which, according to step S4, flows in a direction opposite to the filament travel direction F towards the spinning assembly.

[0158] In step S5, the volume flow 30 is guided to a capillary envelope region 24 (S5), and in step S6, the volume flow is provided at a constant suction pressure P3 in the capillary envelope region 24 (S6). The constant suction pressure P3 can be controlled by a fan device 12 and / or a throttling device, and feedback control can be carried out using sensor devices 33, 35, 38.

[0159] In step S6, the suction pressure P3 is monitored in the capillary envelope region 24, and in step S7, feedback control of the volume flow 30 is carried out based on the detected suction pressure. For example, the suction pressure P3 can be monitored by a first sensor device 33.

[0160] Furthermore, the volume flow can be provided essentially in the range of 1 - 15 (m 3 air) / (kg filament), taking into account the air flow rate to be conveyed and the filament mass to be produced.

[0161] Furthermore, in the case of non-throttling feedback control, the suction pressure of the volume flow 30 can be essentially in the range of 0.01 to 0.1 kPa. In the case of non-throttling feedback control, no throttling device 19 with control or feedback control capabilities is provided in the volume flow suction device 20. Preferably, no air guiding component with a throttling effect is provided either. The throttling device 19 can, for example, have a throttle valve with a movable throttle flap and / or a fixed throttling component.

[0162] In the case of throttling feedback control of the volume flow, the suction pressure is preferably in the range of 0.2 kPa to 3 kPa, because due to the throttling device, the volume flow is reduced in some parts and higher values may be required.

[0163] In each case, the suction pressure value should be added to the ambient pressure.

Claims

1. A device for producing a plurality of filaments (13) forming a yarn (17), the device comprising a spinning assembly (21) positioned in a spinning beam (2), the spinning assembly having a plurality of capillaries (22) for extruding the plurality of filaments (13), and the spinning assembly having a cooling well (1), through which the filaments can be guided, and the device having a volume flow suction device (20), which interacts with the cooling well so as to be able to provide a volume flow (30) at the spinning assembly (21) in a capillary envelope region (24) surrounding the plurality of capillaries (22), wherein: The volume flow aspirator (20) is configured to provide a volume flow (30) at a constant aspirator pressure (P3) at the capillary envelope region (24).

2. The device according to claim 1, characterized in that The volume flow suction device (20) has a fan device (12) which is configured to generate a constant suction pressure (P3).

3. The device according to at least one of the preceding claims 1 and 2, characterized in that The fan device (12) has a rotatable fan rotor (26) having a plurality of rotor blades (28) which are configured such that the suction pressure (P3) can be controlled directly in proportion to the rotation speed of the fan rotor (26).

4. The device according to at least one of the preceding claims, characterized in that The volume flow intake device (20) has a throttle device (19) for setting an intake volume flow (AS), which is positioned upstream of the fan device (12) in the intake direction.

5. The device according to at least one of the preceding claims, characterized in that The throttle device (19) has a fixed throttle effect and / or a regulated throttle effect, wherein the intake volume flow can be controlled and / or regulated by means of the throttle device.

6. The device according to at least one of the preceding claims, characterized in that The volume flow suction device (20) has a heat exchanger for dissipating heat.

7. The device according to at least one of the preceding claims, characterized in that A first sensor device (33) is positioned in the vicinity of the capillary envelope (24), wherein data detected by the first sensor device are transmitted for the purpose of feedback control of the fan device and / or for the purpose of feedback control of the throttling device.

8. The device according to at least one of the preceding claims, characterized in that A second sensor device (35) is arranged at the cooling shaft (1) and / or a third sensor device (38) is arranged at the cooling shaft.

9. The device according to at least one of the preceding claims, characterized in that The first sensor device (33), the second sensor device (35) and / or the third sensor device (38) are configured to detect pressure, in particular air pressure, to detect temperature, in particular ambient temperature and / or to detect humidity, in particular air humidity.

10. The device according to at least one of the preceding claims, characterized in that For the purpose of feedback control of the fan device and / or for the purpose of feedback control of the throttling device and / or for the purpose of feedback control of the heat exchanger (9), the data detected by the first sensor device (33), the second sensor device (35) and / or the third sensor device (38) are evaluated.

11. A method for producing a plurality of filaments (13) forming a yarn (17), wherein: Synthesized filaments (13) are extruded (S1) from a plastic melt along the filament travel direction by means of a spinning assembly (21), wherein the extruded filaments (13) are cooled (S2)(S3) in a cooling shaft (1) by means of a volume flow (30) flowing toward the spinning assembly in the opposite direction to the filament travel direction, wherein the volume flow (30) is guided to a capillary envelope region (S4) and provided (S5) at a constant suction pressure (P3) at the capillary envelope region.

12. The method according to claim 11, characterized in that The suction pressure (S6) is monitored at the capillary envelope region (24), and feedback control (S7) of the volume flow is performed based on the detected suction pressure.

13. The method according to at least one of the preceding claims 11 and 12, characterized in that The volume flow is basically between 1 and 15 (m 3 Air) / (kg filament) range.

14. The method according to at least one of the preceding claims 11 to 13, characterized in that In the absence of throttling control / feedback control, the volume flow essentially has a suction pressure with a value in the range of 0.01 to 0.1 kPa.

15. The method according to at least one of the preceding claims 11 to 14, characterized in that In the case of throttle control / feedback control, the volume flow has a suction pressure with a value in the range of 0.2 to 3 kPa.

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