Extraction device for extracting monomers and synthetic yarn production equipment with extraction device

Abstract

The invention relates to an extraction device for extracting monomers and a synthetic yarn production plant having the extraction device, in which the extraction device (1) has a housing (2) with a yarn channel (3) through which a yarn passes, and at least one outlet opening (4) adjacent to the yarn channel (3) for removing monomers, wherein an ejector channel (5) for forming a biased fluid flow is arranged in the housing (2) at a distance from the yarn channel (3), and wherein the outlet opening (4) is fluidly coupled to the ejector channel (5) by an extraction channel (6) which opens into the ejector channel (5) at a predetermined angle (alpha), therefore, a vacuum can be generated in the extraction channel (6) through the fluid flow in the ejector channel (5).

Description

Field of the Invention

[0001] The present invention relates to an extraction device for extracting monomers and a synthetic yarn production device with such an extraction device. Background Art

[0002] During the production of synthetic yarns, for example in a melt spinning process, volatile components of the synthetic yarn, so-called monomers, are released. In particular, monomers are released in the region adjacent to the spinneret used for extruding the yarn, where the yarn still has a relatively high temperature before subsequent cooling. These monomers can deposit in the regions of the equipment used for producing synthetic yarns. For example, they can condense in colder regions. The deposited monomers can cause problems in the production of synthetic yarns, especially as the accumulation increases. Therefore, the monomers deposited on the spinneret are removed regularly, especially during the cleaning process of the spinneret, by "scraping" the spinneret. To reduce these problems, the prior art includes extraction devices for extracting monomers in synthetic yarn production equipment. Then, during the production of synthetic yarns, the monomers are extracted by the extraction device, and the monomers are selectively deposited in regions that do not adversely affect the production of synthetic yarns. Such an extraction device generally has a housing with a yarn channel for the yarn to pass through, and at least one outlet opening adjacent to the yarn channel for removing monomers.

[0003] DE 10 2013 012 869 A1 describes a spinning box with a plurality of spinnerets and a suction chamber that extends parallel to the lower side of the spinning box, and for each spinneret, has a yarn channel designed as a tubular stub that surrounds the fine spinning space, and the monomers can be extracted by applying a vacuum in the suction chamber. For this purpose, each tubular stub has one or more suction openings on its circumference. The plurality of suction openings are formed by holes that are formed at a uniformly distributed pitch circle pitch on the circumference of the tubular stub.

[0004] DE 10 2015 008 019 A1 relates to a melt spinning device that has at least one spinneret arranged in a heated spinning box and has an exhaust device between the spinning box and the cooling device. Through the exhaust device, the waste gas formed by monomers during the filament extrusion process can be removed before cooling. The exhaust device has a connecting plate with at least one yarn inlet opening, an intermediate plate with at least one hole located below the yarn inlet opening, and an end plate with at least one yarn outlet opening located below the hole. The holes merge into an exhaust channel, and a vacuum can be applied to this channel to extract monomers.

[0005] EP3730678B1 shows another device that is suitable for removing monomers at the spinneret housing. The monomer extractor is arranged between the spinneret assembly and the cooling well. The monomer extractor has a suction chamber that extends parallel to the lower side of the spinneret housing, and for each spinneret, it has a yarn channel designed as a tubular stub that surrounds the fine spinning space, and the monomers can be extracted by applying a vacuum in the suction chamber. The vacuum can be generated by a pump that is connected to the suction chamber through a pipe system. The pipe system has a reflux inhibitor. The reflux inhibitor has a slotted pipe. These slots allow the returned exhaust gas to escape. However, such slots cause corresponding flow losses, so the operation of the monomer extractor requires increased energy consumption.

[0006] DE 10 2013 012 345 A1 describes another extraction device for collecting the released monomers during the yarn extrusion process, which is arranged in the upper region of the cooling well of a melt spinning device for spinning multifilaments. Through the suction openings of the suction nozzles, the extraction device is associated with a plurality of spinnerets of the melt spinning device. In order to generate a uniform suction force in the cooling well, the length of the suction openings of the suction nozzles extends across the entire width of the cooling well, and it leads into the chamber openings of a vacuum chamber connected to the extraction channel along the length of the suction openings.

[0007] The known extraction devices for extracting monomers have the problem that the extraction mass flow rate at each individual yarn fluctuates, especially due to the complex flow geometry. In addition, the magnitudes of these extraction mass flow rates at each individual yarn are not precisely known. More specifically, due to the complex flow geometry, the magnitudes of the extraction mass flow rates at each individual yarn can only be estimated at most. Summary of the Invention

[0008] The basic object of the present invention is to provide an extraction device for extracting monomers, and a synthetic yarn production device using such an extraction device, to reduce or eliminate the problems of the prior art. In particular, the object is to make the extraction mass flow more uniform and / or allow better open-loop and / or closed-loop control thereof.

[0009] This object is achieved first by an extraction device for extracting monomers.

[0010] More precisely, this object is achieved by an extraction device for extracting monomers in a synthetic yarn production device, wherein the extraction device has a housing with a yarn passage for the yarn to pass through, and at least one outlet opening adjacent to the yarn passage for removing monomers, wherein an ejector passage for forming a biased fluid flow is arranged in the housing at a distance from the yarn passage, wherein the outlet opening is fluid-sealedly connected to the ejector passage through an extraction passage, and wherein the extraction passage opens into the ejector passage at a predetermined angle so that a vacuum can be generated in the extraction passage by the fluid flow in the ejector passage.

[0011] The ejector passage has an inlet opening and an outlet opening. The "biased" fluid flow in the ejector passage particularly means that a pressure difference is applied or generated between the inlet opening and the outlet opening during the operation of the extraction device. Then, by appropriately adjusting the pressure difference, monomers are extracted via the outlet opening with a defined extraction mass flow rate. The extraction passage extends at a predetermined angle in the ejector passage relative to the applied flow direction, thereby achieving an ejector effect, and the generated monomers are entrained in the flow direction and removed from the extraction device via the ejector passage. Through the ejector passage and the extraction passage, a particularly uniform extraction mass flow rate can be achieved, so that monomers can be extracted from the yarn passage in a particularly effective manner. Due to the known and particularly simple flow geometry, the extraction mass flow rate is easier to predict / calculate, and thus easier to control through open-loop and / or closed-loop control. Since monomers are effectively extracted, the cleaning interval of the synthetic yarn production device can be increased. In particular, the scraping cycle of the spinneret of the synthetic yarn production device can be increased, thereby extending the service life of the spinneret. In addition, through this effective monomer extraction, the number of yarn breaks can be reduced.

[0012] Advantageously, the monomers can be transported through the vacuum in the extraction passage via the outlet opening and the extraction passage. Then, the monomers can be transported out of the housing through a part of the ejector passage that is fluid-adjacent to the extraction passage by means of the fluid flow in the ejector passage. Preferably, an outlet space is adjacent to the outlet opening of the ejector passage, and during the operation of the extraction device, the monomers are blown out in this space. This ensures that the monomer condensate is in an area where it does not damage the operation of the extraction device and the synthetic yarn production device.

[0013] In a preferred embodiment of the extraction device, the angle is less than 90°, preferably less than 60°. The ejector passage and / or the extraction passage preferably have a linear axis. The ejector effect is influenced by the angle value, and thus the vacuum established in the extraction passage during the operation of the extraction device is also influenced. Therefore, the angle value also has an impact on the extraction mass flow rate established during the operation of the extraction device.

[0014] In another embodiment of the extraction device, the ejector channels are arranged transversely to the yarn channels. In particular, the ejector channels are arranged substantially horizontally. Thus, the extraction device can be implemented in a particularly space-saving manner, in particular it can be implemented flat. Despite the extraction device, a cooling device can still be arranged in the vicinity of the spinneret of the synthetic yarn production equipment, where the extraction device is actually arranged between the spinneret and the cooling device.

[0015] An orifice having at least one through-hole is advantageously arranged and / or formed in the outlet region of the extraction channel in the ejector channel. According to another embodiment of the extraction device, an orifice having at least one through-hole is arranged and / or formed in the extraction channel, in particular in the outlet region where the extraction channel leads to the ejector channel. Through such an orifice, the flow cross-section of the extraction channel and / or the ejector channel is reduced in certain parts, so as to generate a pressure drop in this way, thereby affecting the extraction power or the extraction mass flow established during the operation of the extraction device. In particular, the orifice can be adjustable, and the size of the through-hole can be changed. Thus, in addition to the above-mentioned pressure difference applied to the ejector channel, the extraction mass flow can also be adjusted by the orifice. The optimal extraction mass flow for long cleaning intervals and / or maximum yarn quality is determined in tests, and this depends on the process and the characteristics of the yarn to be produced, such as its material.

[0016] According to an advantageous embodiment of the extraction device, the extraction channel has a rectangular, circular and / or elliptical flow cross-section, at least in certain parts. This simple flow geometry has the effect that the mass flow established through such a channel is easy to predict / calculate, thereby further simplifying the open-loop / or closed-loop control of the mass flow. In addition, such a simple flow geometry can be easily and inexpensively produced.

[0017] As a further preference, a plurality of extraction channels are arranged and / or formed parallel to each other between the respective outlet openings and the ejector channel. Due to the plurality of outlet openings, monomers can thus be extracted from the yarn channel in a larger area and thus more evenly. Despite the plurality of extraction channels, one ejector channel is sufficient to generate a vacuum in all extraction channels.

[0018] Preferably, a fluid removal device is connected to the ejector channel to generate a fluid flow in the ejector channel. Then, for example, the extraction mass flow is further controlled by a pneumatic actuator in the inlet opening and / or outlet opening region of the ejector channel. Such a pneumatic actuator can also be arranged in the region of the fluid removal device and / or can be implemented by the fluid removal device itself. The above-mentioned outlet space adjacent to the outlet opening of the ejector channel is preferably designed as a gap of the fluid removal device, and this space is arranged between the ejector channel and the pump and / or fan of the fluid removal device, so that monomers can then be removed from this gap by the pump and / or fan.

[0019] If the ejector channel has an inlet opening through which fluid can be fed into the ejector channel, in particular by means of a pressurized fluid feed, this can be advantageous. Such a pressurized fluid feed can be used together with or as an alternative to the above-described fluid removal device. A biasing fluid flow in the ejector channel can be formed by means of the pressurized fluid feed and the fluid removal device, in particular a pressure difference between the inlet opening and the outlet opening of the ejector channel can be generated.

[0020] Preferably, straight ejector channels are respectively arranged and / or formed on each of two opposite sides of the yarn channel in the housing. In this case, in each case, at least one outlet opening is fluid-tightly connected to one of the ejector channels via an extraction channel. The two ejector channels are preferably parallel to each other. Thus, the area from which monomers can be extracted due to the outlet openings can be further enlarged, and thus the uniformity of extraction is also further improved.

[0021] As a further preference, the ejector channels, extraction channels and / or orifices are designed as grooves in the housing. This can also be advantageous if the housing has first and second housing parts and the ejector channels, extraction channels and / or orifices are formed as grooves that are partly in the first and / or partly in the second housing part. This enables the extraction device to be produced in a simple manner and with a small number of components.

[0022] The extraction device advantageously has a plurality of adjacent yarn channels and associated outlet openings, ejector channels and extraction channels. In a preferred embodiment of the extraction device, all the ejector channels are connected to a common fluid removal device. In this way, the expenditure on equipment for extracting monomers from a plurality of adjacent-produced yarns is reduced, in particular by means of a single common fluid removal device. In particular, furthermore, only one housing or two housing parts are required to form all the yarn channels and the associated outlet openings, ejector channels and extraction channels.

[0023] The object on which the present invention is based is also achieved by a synthetic yarn production device with the above-described extraction device. By means of the extraction device, it is possible to produce particularly high-quality yarns with the device, in particular yarns with few broken yarns and / or highly uniform properties.

[0024] With the synthetic yarn production device, in particular, a melt spinning process can be carried out, in which first a synthetic molten polymer is extruded to form a multifilament, then it is passed through the yarn channels of the extraction device, then cooled, and then guided by godets, in particular the yarn is drawn, and finally wound up. Description of the Drawings

[0025] Preferred embodiments will be explained in more detail below with reference to the drawings.

[0026] Figure 1a Schematically shows a first embodiment of an extraction device, which is a cross-sectional view along Figure 1b line B-B in

[0027] Figure 1b Schematically shows a first embodiment of an extraction device, which is a cross-sectional view along Figure 1a line A-A in

[0028] Figure 1c Schematically shows a first embodiment of an extraction device, which is a side view;

[0029] Figure 2 Schematically shows a second embodiment of an extraction device, which is a cross-sectional view similar to Figure 1a the cross-sectional view in

[0030] Figure 3 Schematically shows an embodiment of a synthetic yarn production device with an extraction device according to its first embodiment, which is a cross-sectional view, in particular a cross-sectional view along Figure 1a line C-C in

[0031] List of reference numerals

[0032] 1 Extraction device

[0033] 2 Housing

[0034] 3 Yarn channel

[0035] 4 Outlet opening

[0036] 5 Injector channel

[0037] 5.E Inlet opening of injector channel 5

[0038] 5.A Outlet opening of injector channel 5

[0039] 6 Extraction channel

[0040] 7 Orifice

[0041] 8.1 First housing part

[0042] 8.2 Second housing part

[0043] 9 Fluid removal device

[0044] 9.Z Gap of fluid removal device 9

[0045] 10 Spinneret

[0046] 11 Nozzle plate

[0047] 12 Nozzle opening

[0048] 13 Spinning box

[0049] 14 Cooling device

[0050] 15 Cooling well

[0051] 16 Heat insulation layer

[0052] 17 Blowing chamber

[0053] 18 Permeable cooling cylinder

[0054] α angle Detailed implementation mode

[0055] According to Figure 1a 、 Figure 1b 、 Figure 1c 、 Figure 2 and Figure 3 The extraction device 1 for extracting monomers has a housing 2 with a yarn passage 3 for the yarn to pass through, and at least one outlet opening 4 adjacent to the yarn passage 3 for removing monomers. Monomers escape from the yarn particularly in the region of the yarn passage 3. An injector passage 5 for forming a biasing fluid flow is arranged in the housing 2 at a certain distance from the yarn passage 3. The outlet opening 4 is fluid-sealedly connected to the injector passage 5 through an extraction passage 6. The extraction passage 6 leads into the injector passage 5 at a predetermined angle α, so that a vacuum can be generated in the extraction passage 6 by the fluid flow in the injector passage 5. Figure 3 The extraction device 1 in the synthetic yarn production equipment is shown. The fluid flow formed during the operation of the extraction device 1 is indicated by arrows in Figure 1a . During the operation of the extraction device 1, the fluid present in the extraction passage 6, especially the mixture of air and monomers, is carried away by the fluid flow in the injector passage 5. Since the extraction passage 6 leads into the injector passage 5 at a predetermined angle α, the situation where the fluid flow flows from the injector passage 5 into the extraction passage 6 during the operation of the extraction device 1 is particularly avoided. The value of the mass flow rate of the fluid flowing from the extraction passage 6 into the injector passage 5 is the same as the value of the mass flow rate flowing from the yarn passage 3 through the outlet opening 4 into the extraction passage 6.

[0056] Preferably, the monomers can be transported through the outlet opening 4 and the extraction passage 6 by the vacuum in the extraction passage 6. Then, the monomers can be transported out of the housing 2 through a part of the injector passage 5 that is fluid-adjacent to the extraction passage 6 by the fluid flow in the injector passage 5. The monomers can be transported out of the housing 2 through the outlet opening 5.A of the injector passage 5.

[0057] The angle α is less than 90°, preferably less than 60°. In particular, the angle α is chosen to take into account the desired vacuum level formed in the extraction channel 6 and thus the desired extraction intensity for the monomers. In this case, most of the monomers escaping from the yarn in the yarn channel 3 can then be extracted without adversely affecting the properties of the yarn.

[0058] The injector channel 5 is arranged transversely to the yarn channel 3. The injector channel 5 is also arranged substantially horizontally. The injector channel 5 has a substantially constant flow cross-section. Conversely, it is also conceivable that the injector channel has a variable flow cross-section, for example for forming a diffuser and / or nozzle profile at least in some parts. The injector channel 5 has a rectangular, circular and / or elliptical flow cross-section at least in some parts. The injector channel 5 is straight. Conversely, it is also conceivable that the injector channel is curved. According to Figure 1a and Figure 1c In the first exemplary embodiment in, the injector channel 5 is cylindrical and has a circular flow cross-section.

[0059] An orifice 7 having at least one through-hole is arranged and / or formed in the extraction channel 6, in particular in the outlet region where the extraction channel 6 opens into the injector channel 5.

[0060] Another orifice 7 (shown in dashed lines as its use is optional and having at least one through-hole) is arranged and / or formed in the outlet region of the extraction channel 6 in the injector channel 5. Through such orifices 7, a pressure drop is generated during their flow-through, which affects the extraction of the monomers. In particular, the opening width of the through-hole and / or the sum of the opening widths of a plurality of through-holes can be adjusted. Thus, the intensity used for extracting the monomers can then be adjusted. Depending on the properties of the yarn (in particular the material, temperature, yarn speed), the optimal extraction effect is then set for the operation of the extraction device 1.

[0061] The extraction channel 6 has a rectangular, circular and / or elliptical flow cross-section at least in some parts. According to Figure 1a In the first exemplary embodiment in, the extraction channel 6 is of cylindrical design and has a circular flow cross-section. Other designs of the extraction channel are conceivable, for example a design with a curved profile. The extraction channel 6 is also arranged substantially horizontally. The extraction channel 6 has a substantially constant flow cross-section. Conversely, it is also conceivable that the extraction channel has a variable flow cross-section, for example for forming a diffuser and / or nozzle profile at least in some parts.

[0062] According to Figure 1a 、 Figure 1b 、 Figure 1c and Figure 3In the first embodiment of the extraction device 1, a plurality of extraction channels 6 are arranged parallel to each other and / or formed between the respective outlet openings 4 and the injector channels 5. Then, each angle α also substantially has the same value. However, it is also conceivable that different extraction channels form different-sized angles and that the plurality of extraction channels are then arranged non-parallel to each other. Figure 2 Only one extraction channel 6 fluid-tightly connected to the associated injector channel 5 is shown, which channel here in particular has a rectangular flow cross-section.

[0063] A fluid removal device 9 is connected to the injector channel 5 to generate a fluid flow in the injector channel 5. The injector channel 5 in particular opens into a gap 9.Z of the fluid removal device 9, which gap is designed with walls (not shown here), in particular plates.

[0064] The injector channel 5 has an inlet opening 5.E through which fluid can be fed into the injector channel 5, in particular by means of a pressurized fluid feed (not shown here). A "biased" fluid flow in the injector channel 5 in particular means that a pressure difference is formed between the inlet opening 5.E and the outlet opening 5.A of the injector channel 5. This pressure difference can be formed by means of a pressurized fluid feed and / or the fluid removal device 9. It is sufficient if a pressurized fluid feed or the fluid removal device 9 is provided. Without a pressurized fluid feed, for example, air can be drawn in through the inlet opening 5.E from the environment. The pressurized fluid feed and / or the fluid removal device 9 can each have a pump and / or a fan to generate a pressure difference or a fluid flow.

[0065] According to Figure 1a and Figure 2 , straight injector channels 5 are arranged and / or formed in the housing 2 on each of two opposite sides of the yarn channel 3. In each case, at least one outlet opening 4 is fluid-tightly connected to one of the injector channels 5 via an extraction channel 6. Figure 1a Four outlet openings 4 are respectively shown, which are each fluid-tightly connected to one of the injector channels 5. However, conversely, it is also conceivable to provide fewer than four outlet openings, for example two or three or more than four, in particular five to ten, which are each fluid-tightly connected to one of the injector channels. Figure 2 Exactly one outlet opening 4 is respectively shown, which is fluid-tightly connected to one of the injector channels 5. The outlet opening 4 fluid-tightly connected to one of the injector channels 5 or the connected outlet openings 4 are arranged on opposite sides of the yarn channel 3. Thus, monomers can be extracted on both sides of the yarn channel 3.

[0066] The injector channel 5, the extraction channel 6 and / or the orifice 7 are designed as grooves in the housing 2. Such grooves can be produced, for example, by a casting method and / or in a machining method for producing the housing 2.

[0067] The housing 2 has a first housing part 8.1 and a second housing part 8.2, which can be seen in particular from Figure 1b and Figure 1c According to Figure 2 The extraction device 1 according to the second embodiment shown in Figure 2 also has a first housing part 8.1 and a second housing part 8.2, although Figure 2 only the first housing part 8.1 is shown and the matching second housing part 8.2 is not shown. The injector channel 5, the extraction channel 6 and / or the orifice 7 are formed as grooves that are partly in the first housing part 8.1 and / or partly in the second housing part 8.2. It can be seen in particular from Figure 1c that half of the injector channel 5, the extraction channel 6 and / or the orifice 7 is formed in the first housing part 8.1 and half in the second housing part 8.2, whereupon the complete geometry is then formed by assembling the two housing parts 8.1, 8.2 with one another. However, conversely, it is also conceivable to provide the groove only in one of the two housing parts, whereupon the other of the two housing parts has a flat outer surface facing the opposite housing part in the assembled state, which is particularly convenient when forming an angled channel geometry. The assembly of the first housing part 8.1 with the second housing part 8.2 is effected in particular by means of at least one threaded joint.

[0068] Figure 3The extraction device 1 in a synthetic yarn production facility is shown, where the facility is designed here as a melt spinning facility. The melt spinning facility has a spinneret 10, which is held on the lower side of the spinning cabinet 13. The spinneret 10 is connected to a spinning pump (not specifically shown here), through which the polymer melt can be fed to the spinneret 10. The spinneret 10 has a nozzle plate 11 with a number of nozzle openings 12 on the lower side. The nozzle openings 12 are used to extrude slender filaments, which together form a multifilament. The spinning cabinet 13 is designed to be heated and is thermally isolated from the environment by a heat insulation layer 16. A cooling device 14 is provided, which is arranged below the spinneret 10. The extraction device 1 is arranged between the spinneret 10 and the cooling device 14. Thus, the cooling device 14 is also arranged below the extraction device 1. The cooling device 14 has a blowing chamber 17 and a breathable, preferably hollow cylindrical cooling cylinder 18, where the cooling cylinder 18 is arranged concentrically with the yarn passage 3. A cooling well 15 is formed within the cooling cylinder 18, through which the yarn can pass. The yarn can be cooled in the cooling well 15 by feeding a cooling fluid into the cooling well 15 via the blowing chamber 17 and the cooling cylinder 18. Monomers escape from the filaments forming the yarn, especially in the yarn passage 3, because the yarn still has a high temperature here due to its proximity to the spinneret 10, especially before reaching the cooling device 14. The extraction device 1 is connected to the lower side of the spinning cabinet 13, especially by at least one threaded joint. In this case, the extraction device 1 is also at least partially surrounded by the heat insulation layer 16.

[0069] It is conceivable that a plurality of spinnerets are held side by side in the spinning cabinet. Then, it can further be envisaged that the extraction device has a plurality of adjacent yarn passages (with associated outlet openings), injector channels, and extraction channels. Then, all the injector channels are preferably connected to a common fluid removal device.

Claims

1. An extraction device (1) for extracting monomers in a synthetic yarn production device, wherein: The extraction device (1) comprises a shell (2) and at least one outlet opening (4) for removing monomers, wherein the shell (2) has a yarn channel (3) for yarn to pass through, and the at least one outlet opening (4) is adjacent to the yarn channel (3), wherein an injector channel (5) for forming a biasing fluid flow is arranged in the shell (2) at a certain distance from the yarn channel (3), wherein the outlet opening (4) is connected to the injector channel (5) in a fluid-tight manner through an extraction channel (6), wherein the extraction channel (6) opens into the injector channel (5) at a predetermined angle (α), thereby being able to generate a vacuum in the extraction channel (6) through the fluid flow in the injector channel (5).

2. The extraction device (1) according to claim 1, characterized in that: The monomer can be conveyed through the outlet opening (4) and the extraction channel (6) by means of the vacuum in the extraction channel (6), and the monomer can then be conveyed out of the housing (2) by means of the fluid flow in the ejector channel (5) via a portion of the ejector channel (5) fluidically adjacent to the extraction channel (6).

3. Extraction device (1) according to at least one of the preceding claims, characterized in that The angle (α) is smaller than 90°, preferably smaller than 60°.

4. Extraction device (1) according to at least one of the preceding claims, characterized in that The injector channel (5) is arranged transversely to the yarn channel (3).

5. Extraction device (1) according to at least one of the preceding claims, characterized in that An orifice having at least one through hole is arranged and / or formed in the outlet region of the extraction channel (6) in the injector channel (5).

6. Extraction device (1) according to at least one of the preceding claims, characterized in that The extraction channel (6) has a rectangular, circular and / or elliptical flow cross section at least in certain sections.

7. Extraction device (1) according to at least one of the preceding claims, characterized in that A plurality of extraction channels (6) are arranged in parallel with each other and / or formed between corresponding outlet openings (4) and the ejector channel (5), and / or a fluid removal device (9) is connected to the ejector channel (5) to generate a fluid flow in the ejector channel (5).

8. Extraction device (1) according to at least one of the preceding claims, characterized in that The injector channel (5) has an inlet opening (5.E) via which a fluid can be fed into the injector channel (5), in particular by means of a pressurized fluid.

9. Extraction device (1) according to at least one of the preceding claims, characterized in that A straight injector channel (5) is arranged and / or formed in the housing (2) on each of two mutually opposite sides of the yarn channel (3), wherein in each case at least one outlet opening (4) is connected to one of the injector channels (5) in a fluid-tight manner via an extraction channel (6).

10. Extraction device (1) according to at least one of the preceding claims, characterized in that The injector channel (5), the extraction channel (6) and / or the orifice (7) are designed as grooves in the housing (2), or the housing (2) has a first housing part (8.1) and a second housing part (8.2), and the injector channel (5), the extraction channel (6) and / or the orifice (7) are formed as grooves partly in the first housing part (8.1) and / or partly in the second housing part (8.2).

11. Extraction device (1) according to at least one of the preceding claims, characterized in that The extraction device has a plurality of adjacently arranged yarn channels, ejector channels and extraction channels with associated outlet openings, and / or all ejector channels are connected to a common fluid removal device.

12. A synthetic yarn production plant having an extraction device (1) according to any one of the preceding claims 1 to 11.

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