EP2955256A1 - Air spinning machine and method for operating an air spinning machine - Google Patents

Abstract

The invention relates to a method for operating an air-jet spinning machine, wherein the air-spinning machine has at least one spinning station with a spinneret (2) for producing a yarn (6), wherein the spinneret (2) during operation of the spinning station a fiber strand (3) via an inlet (4), wherein the fiber structure (3) within a vortex chamber (5) of the spinneret (2) by means of a fluid vortex receives a rotation, so that from the fiber structure (3) a yarn (6) is formed, which is the spinneret (2) finally leaves via an outlet (7), and wherein the spinning station during the operation of the air spinning machine with the aid of an additive supply (8) at least temporarily an additive (9) and fed to the fiber structure (3) or parts of the spinneret and / or the yarn (6) is applied. According to the invention, the yarn (6) leaving the outlet (7) is monitored with respect to at least one physical parameter with the aid of a sensor system, based on at least one measured value supplied by the sensor system (11) and correlated with said parameter it is determined whether and / or how much additive (9) has been applied to the fiber structure (3) or to the yarn (6) produced therefrom and passing through the sensor system (11). In addition, an air-spinning machine for carrying out the method is proposed.

Description

The present invention relates to a method for operating an air-jet spinning machine, wherein the air-spinning machine has at least one spinning station with a spinneret for producing a yarn, wherein the spinneret during operation of the spinning station, a fiber strand is supplied via an inlet, wherein the fiber structure within a swirl chamber of the spinneret with the aid of a fluidized air flow receives a rotation, so that from the fiber strand a yarn is formed, which finally leaves the spinneret through an outlet, and wherein the spinning station during the operation of the air spinning machine with the aid of an additive supply at least temporarily fed an additive and the fiber structure and / or the yarn or parts of the spinneret is applied.

In addition, an air-spinning machine is proposed, which has at least one spinning station with a spinneret for producing a yarn from a fiber strand fed to the spinneret, wherein the spinneret has an inlet for the fiber structure, an internal swirl chamber, a yarn forming element projecting into the swirl chamber and an outlet for the yarn produced in the interior of the vortex chamber by means of a vortex air flow, and wherein the spinning station is associated with an additive supply, with the aid of which the spinning station at least temporarily an additive fed during operation of the spinning station and on the fiber structure and / or the yarn or parts of the spinneret can be applied.

Air-jet spinning machines with corresponding spinning stations are known in the art and serve to produce a yarn from an elongate fiber structure. The outer fibers of the fiber composite are in this case by means of a vortex air flow generated by the air nozzles within the vortex chamber in the region of an inlet mouth of the Garnbildungselements wound around the inner core fibers and finally form the decisive for the desired strength of the yarn Umwindefasern. This creates a yarn with a true rotation, which finally dissipated via a vent channel from the vortex chamber and z. B. can be wound on a sleeve.

For the purposes of the invention, the term yarn generally means a fiber structure in which at least some of the fibers are wound around an inner core. Thus, a yarn is included in the traditional sense, which can be processed into a fabric, for example with the aid of a weaving machine. However, the invention also relates to air spinning machines, with the help of so-called roving (other name: Lunte) can be produced. This type of yarn is characterized by the fact that, despite a certain strength, which is sufficient to transport the yarn to a subsequent textile machine, it is still delayable. The roving can thus with the help of a defaulting device, z. As the drafting system, a roving processing textile machine, such as a ring spinning machine, are warped before it is finally spun.

In the production of a yarn of chemical fibers, for example polyester, or mixtures of natural and chemical fibers, deposits are formed on the surface of the yarn-forming element. The production of man-made fibers involves a so-called preparation of the continuous fibers during the manufacturing process. In this case, a spin finish, usually oils with various additives, applied to the continuous fibers, which allows a treatment, such as stretching the continuous fibers at high speeds. Some of these preparation agents remain attached to the man-made fibers in the further treatment and lead to impurities in the air-spinning machine. The fibers supplied to the air-spinning machine in the form of a fiber composite are usually supplied to the spinneret through a pair of delivery rollers. The delivery roller pair can one Output roller pair correspond to a drafting system. Used drafting systems serve to refine the submitted fiber composite before entering the spinneret.

In the entry region of the spinneret, a fiber guide element is usually arranged, via which the fiber structure is guided into the spinneret and finally into the area of the yarn-forming element. As Garnbildungselemente spindles are predominantly used with an internal exhaust duct. At the tip of the yarn formation element, compressed air is introduced through the housing wall of the spinneret in such a way that the said rotating fluidized air flow results. As a result, individual outer fibers are separated from the fiber structure leaving the fiber guiding element and are turned over via the tip of the yarn formation element. In the further course, these liberated fibers rotate on the surface of the yarn-forming element. As a result, by the forward movement of the inner core fibers of the fiber composite, the rotating fibers are wound around the core fibers, thereby forming the yarn. However, due to the movement of the individual fibers over the surface of the yarn-forming element, deposits on the yarn-forming element also form due to the adhesion to the fibers from the production process. Deposits on the yarn-forming element can also be caused by damaged fibers. Deposits may also arise on the surface of the spinneret interior or the fiber guiding element for the same reasons. These adhesions lead to a deterioration of the surface finish of the Garnbildungselements and cause deterioration of the yarn quality produced. Regular cleaning of the affected surfaces is therefore necessary in order to maintain a consistent quality of the spun yarns.

The cleaning of the surfaces of the Garnbildungselements, the Spinndüseninnenraums and the fiber guide element can manually by a periodic removal of Garnbildungselements done, but this leads to a considerable maintenance, combined with a corresponding failure.

The EP 2 450 478 on the other hand discloses a device which allows to perform an automatic cleaning without stopping the machine. For this purpose, an additive is added to the compressed air used for the formation of the fluidized air flow within the spinneret. The additive is guided by the compressed air to the Garnbildungselement and causes a cleaning of the surface of the Garnbildungselements.

In addition, it is possible to apply additive to the fiber structure, parts of the spinneret, or the yarn made therefrom to improve the properties of the yarn made therefrom, for example with regard to its hairiness. Furthermore, higher production speeds can be achieved with a corresponding additive addition, so that the machine can also produce more economically and energy can be saved.

Object of the present invention is therefore to further develop the known from the prior art additive addition and to propose a corresponding air-spinning machine, with the help of the training can be realized.

The object is achieved by a method and an air spinning machine with the features of the independent claims.

According to the invention, the method for operating an air-spinning machine is characterized in that the yarn leaving the outlet of the spinneret is monitored with respect to at least one physical parameter with the aid of a sensor, based on at least one measured value supplied by the sensor and correlated with said characteristic It is determined whether and / or how much additive has been applied to the fiber structure or the yarn produced therefrom and passing through the sensor system.

In general, the monitoring according to the invention can take place during a normal operation during which the spinneret produces yarn and the additive addition serves to improve the yarn properties. Additionally or alternatively, it is also possible to monitor the addition of additive during a cleaning operation of the spinning station, during which the additive serves the purpose of the above-described cleaning.

While the addition of additive in the prior art was metered only in terms of quantity, it is now possible with the present invention to qualitatively and / or quantitatively monitor the additive addition and to determine the volume or mass flow of the added additive in the event of a deviation from corresponding desired values during the additive addition to change. Incidentally, the addition of additive can take place in the region of the inlet of the spinneret or even within the same.

Said monitoring now does not take place by measuring the additive volume or mass flow within an additive line delivering the additive to the spinneret. Rather, the invention proposes an indirect monitoring, in which the additive addition is detected and / or quantitatively determined on the basis of changes in one or more selected parameters of the yarn. The parameters may in principle be any physically measurable properties of the yarn which change qualitatively or quantitatively as a result of the addition of the additive. For example, it would be possible to monitor the so-called hairiness of the yarn. This is a measure of the protruding from the package fiber ends or fiber loops, with an additive addition in principle brings about a reduction in hairiness, since the outwardly protruding fiber components are applied by the additive to the package. Likewise, the length-related mass changes (= mass of the fiber material formed by Garnköpers plus mass of added additive) and possibly also the thickness of the yarn at an additive addition, whereby these parameters are monitored by means of a corresponding sensor. Of course, other characteristics, such as mass and / or thickness variations, light reflectivity, light absorbance, uniformity of yarn structure, etc., may be monitored, taking into account all physical characteristics that are affected by the additive addition.

In any case, the monitoring of the corresponding parameters allows a statement as to whether and, if so, how much additive is added during the normal and / or cleaning operation. In addition, liquid or solid substances (or mixtures thereof) may be used as the additive, water or an aqueous solution being preferred.

It is particularly advantageous if the production of the yarn is interrupted with the aid of a control unit if the additive feed detected with the aid of the sensor system deviates qualitatively and / or quantitatively from corresponding setpoint values in a defined manner. This prevents that during normal operation, during which an additive addition should actually take place, a yarn is produced on whose fibers too little or no additive has been applied due to a lack of additive delivery. The same applies to the cleaning operation. Here, too, an interruption of the yarn production or a repetition of a cleaning sequence could take place if the measured values transmitted by the sensor system are outside defined limit values.

In particular, it is advantageous if the sensor system comprises an optical sensor with the aid of which the yarn is monitored, wherein based on the measured values of the optical sensor a qualitative monitoring of the additive supply takes place. For example, it would be conceivable with the aid of the optical sensor to monitor the above hairiness of the yarn, this z. Example, the yarn length-related number of free, outwardly projecting fiber ends whose individual or average length or the change of the above sizes could be considered. Likewise, it is possible with the aid of optical sensors to monitor the light absorption or reflection or even the size of the shadow of the yarn with appropriate illumination, which may change by the addition of an additive. Furthermore, the thickness of the yarn or other geometric properties of the same can be detected, which can be optically recognized and whose amounts depend on the additive addition.

Furthermore, it is advantageous if the sensor system comprises a capacitive sensor, with the aid of which the yarn is monitored with regard to its mass, based on the measured values of the capacitive sensor, a quantitative monitoring of the additive supply takes place. Since the mass of the yarn passing through the sensor system is composed of the mass of the yarn package consisting of the fiber material of the fiber composite and the applied additive, it is possible with the aid of the capacitive sensor to monitor an additive addition qualitatively but in particular also quantitatively under otherwise identical spinning conditions. The monitoring thus allows not only a statement as to whether additive was added, but also how much.

In principle, it should be pointed out at this point that the sensor system can of course comprise further or alternative sensors with the aid of which individual physical properties of the yarn can be monitored. For example, it would be possible to provide a plurality of sensors that detect different optical properties of the yarn. In addition, several capacitive sensors could be present to monitor several properties of the yarn that can be capacitively measured. It is also possible to query several channels of each sensor and to evaluate separately using the control unit. So it would be possible, a Channel of the capacitive sensor to graphically display the measured values determined on a display, while another channel is connected directly to a control unit, which also monitors or controls the individual functions of the corresponding spinning station. Finally, individual sensors or channels of corresponding sensors could serve to monitor the additive addition, while other sensors or channels enable the monitoring of the yarn with regard to undesired yarn defects (short or long thick or thin areas, etc.). In general, it would finally be possible to place a plurality of sensors at different locations, wherein it is preferable to combine all the sensors of the sensor system according to the invention as a structural unit which is located in the yarn path between the outlet of the spinneret and downstream in the transport direction of the yarn winding device. It is therefore quite conceivable that a so-called yarn cleaner takes over the function of the sensor, which is known from the prior art and he previously takes over only the function of detecting yarn defects.

Furthermore, it is extremely advantageous if the additive is supplied in a pulse-like manner, wherein the quantitative monitoring of the additive supply takes place by evaluation of the short-term mass fluctuations of the yarn detected by the capacitive sensor. For example, it would be conceivable that the additive delivery responsible for the additive addition to the fiber structure or the yarn or an additive supply line connecting the additive delivery with an additive reservoir has a metering unit which opens and closes several times per second. The additive is in this case not applied as a uniform additive stream, but rather in the form of a plurality of individual doses on the fiber structure or the yarn. This results in a variety of tiny mass variations of the yarn, which can be detected by means of a capacitive sensor. By evaluating the measured values, in particular their averaging, it is finally possible to make a reliable statement about the additive addition or the amount of added additive.

It is also advantageous if the volume flow of the added additive at least temporarily amounts to between 0.001 ml / min and 7.0 ml / min, preferably between 0.02 ml / min and 5.0 ml / min, particularly preferably between 0, 05 and 3.0 ml / min, and / or that the mass flow of the added additive at least temporarily an amount between 0.001 g / min and 7.0 g / min, preferably between 0.02 g / min and 5.0 g / min, more preferably between 0.05 g / min and 3.0 g / min. While higher values permit cleaning of the individual areas of the spinning station or of the portions of the additive supply through which the additive flows, smaller values are advantageous in normal operation, in which the additive merely serves to improve the yarn properties (hairiness, strength, elongation and uniformity of the yarn) , The metering unit should therefore allow a volume or mass flow over the mentioned spread widths in order to be able to operate the individual spinning stations both in normal operation and in cleaning operation.

Particular advantages arise when the volume flow (or mass flow) of the added additive during normal operation of the spinning station an amount between 0.001 ml / min (or g / min) and 1.5 ml / min (or g / min ), preferably between 0.01 ml / min (or g / min) and 1.0 ml / min (or g / min) and during a cleaning operation of the spinning station an amount between 2.0 ml / min (or g / min) and 7.0 ml / min (or g / min), preferably between 3.0 ml / min (or g / min) and 7.0 ml / min (or g / min).

The exact value can be selected depending on the properties of the fiber composite and / or its feed rate into the spinning station and / or the withdrawal speed of the yarn from the spinning station and can therefore vary depending on the application. Likewise, the value provided for the cleaning operation can be selected as a function of the duration of the cleaning operation or the duration of the normal operation between two cleaning sections.

Moreover, it is advantageous if the yarn is also monitored with the aid of the sensor system to determine whether the thickness and / or mass of the yarn exceeds or falls below predefined limit values in a defined manner, the sensor system being connected to a control unit of the air spinning machine and wherein the control unit interrupts the production of the yarn if at least one of the limit values is exceeded or exceeded in a defined manner. In this case, the sensors are not just used to monitor the additive addition. Rather, it can also be monitored with the aid of the sensor system, whether the yarn production basically meets the specifications. For example, excessively long or frequent thin spots in the yarn, which can not be attributed to a lack of additive addition, an indication that the yarn production in the spinneret is not done properly. Likewise, the signals of several sensors or individual channels of the same could be evaluated combined in order to perform a quality control of the yarn in addition to the control of the additive addition. If, for example, the capacitive sensor detects an unusual increase in mass or variation in mass, although the optical sensor reports that the addition of additive takes place uniformly, this would be regarded as an indication of a defective yarn quality.

It is also advantageous if the mass flow and / or volume flow of the added additive during a cleaning operation of the spinning station is higher than during normal operation, wherein at least one of the limits mentioned in the previous paragraph, when exceeding or falling below interrupted the production of the yarn will have a different amount during the cleaning operation than during normal operation. If the limits were kept constant, an increase in the amount of additive added during the cleaning operation would indicate a thick spot or unacceptable change in another physical characteristic of the yarn and interrupt yarn production, although the additive addition and yarn production during the cleaning operation would actually be within specification. It would therefore be, for example it makes sense to increase the upper limit of the length-related mass at which the yarn production is interrupted during the cleaning operation compared to the normal operation, since the mass of the yarn is inevitably increased during the cleaning operation by the increased additive addition. Likewise, the corresponding lower limit should be increased in order to detect an insufficient addition of additive and to be able to interrupt the yarn production when falling below a correspondingly adjusted value. In principle, it makes sense that the respective limit values for the normal and for the cleaning operation are selected to be different. It should be noted, however, that this approach is particularly concerned with the quantitative monitoring of additive addition. By contrast, the limits of the readings provided by a sensor monitoring only the additive additive addition could be the same for both modes (provided that additive is added both during normal and during the cleaning operation and the readings of the corresponding sensor only to be evaluated as to whether additive is added or not).

The spinning unit of the air-spinning machine according to the invention finally comprises a sensor with which the yarn leaving the outlet of the spinneret can be monitored with respect to at least one physical parameter, wherein the spinning unit is assigned a control unit which is designed on the basis of at least one of the sensors supplied with and to determine the measured value correlated to said parameter, whether and / or how much additive was applied to the fiber structure or the yarn produced therefrom and passing through the sensor system. With regard to possible advantageous embodiments of the monitoring or possible features of the sensor system or the evaluation of the measured values transmitted by the sensor system, reference is made to the previous or subsequent description. Generally, it should be noted at this point that the control unit can be designed to operate the air-jet spinning machine according to the individually described method features, these being used individually or in any desired manner Combination can be realized.

Figur 1

eine Seitenansicht einer Spinnstelle einer erfindungsgemäßen Luftspinnmaschine,

Figur 2

einen teilweise geschnittenen Ausschnitt einer Spinnstelle einer erfindungsgemäßen Luftspinnmaschine, und

Figur 3

verschiedene Ausschnitte eines Garns.

Further advantages of the invention are described in the following exemplary embodiments. It show, each schematically:

FIG. 1

a side view of a spinning station of an air-spinning machine according to the invention,

FIG. 2

a partially sectioned section of a spinning station of an air-spinning machine according to the invention, and

FIG. 3

different sections of a yarn.

FIG. 1 shows a section of a spinning station of an air-spinning machine according to the invention (wherein the air-spinning machine can of course have a plurality of, preferably adjacent to each other, spinning stations). If required, the air-spinning machine can comprise a drafting system with a plurality of drafting rollers 13, which is supplied with a fiber structure 3, for example in the form of a relined conveyor belt (for reasons of clarity, only one of the drafting rollers 13 shown is provided with a reference numeral). Furthermore, the spinning station shown comprises a spinneret 2 with an internal swirl chamber 5 (see FIG. 2) in which the fiber structure 3 or at least part of the fibers of the fiber composite 3 is provided with a rotation (after passing through an inlet 4 of the spinneret 2) Mode of action of the spinning station will be described in more detail below).

In addition, the air-spinning machine may include a pair of take-off rollers 24 downstream of the spinneret 2 and a winding device 1 connected downstream of the take-off roller pair 24 for winding up the yarn 6 leaving the spinneret 2 onto a sleeve. Likewise, a, for example, pneumatically operating, Garnabfuhreinheit 12 may be present to yarn sections during a cleaner cut, in which a yarn error is removed from the yarn 6 to be able to dissipate. The spinning station does not necessarily have a drafting system. Also, the take-off roller pair 24 or the Garnabfuhreinheit 12 is not absolutely necessary.

The spinning station shown generally works by an air spinning process. To form the yarn 6, the fiber structure 3 in a predetermined transport direction T via a, provided with said inlet 4 forming the inlet opening, and in FIG. 2 shown fiber guide element 23 is guided in the swirl chamber 5 of the spinneret 2. There, it receives a rotation, ie at least a portion of the free fiber ends 10 of the fiber composite 3 (see Figure 4) is by a vortex air flow, which is generated by appropriately arranged in a vortex chamber surrounding the vortex chamber 5 air nozzles 19, detected (the air nozzles 19 preferably supplied via an air supply line 18 with compressed air, which opens into a connected to the air nozzles 19 air supply chamber 17). A part of the fibers is in this case pulled out of the fiber structure 3 at least a little bit and wound around the tip of a projecting into the swirl chamber 5 Garnbildelements 21. Characterized in that the fiber structure 3 is withdrawn through an inlet mouth of Garnbildungselements 21 via a arranged within Garnbildelements 21 extractor 20 from the vortex chamber 5 and finally via an outlet 7 from the spinneret 2, finally, the free fiber ends 10 are pulled in the direction of the inlet port and loop as a so-called Umwindefasern to the centrally extending core fibers - resulting in a desired rotation having yarn 6. The introduced via the air nozzles 19 compressed air leaves the spinneret 2 finally via the discharge duct 20 and any existing air discharge 25, which if necessary with a negative pressure source may be connected.

In general, it should be made clear at this point that the yarn 6 produced can basically be any desired fiber structure 3, which characterized in that an outer part of the fibers (so-called Umwindefasern) around an inner, preferably untwisted or if necessary also rotated part of the fibers wrapped around to give the yarn 6, the desired strength.

Furthermore, the spinning station is associated with an additive supply 8, which comprises one or more additive reservoirs 15 and one or more, preferably at least partially flexible, additive supply lines 14, via which the respective additive reservoir 15 with an additive delivery arranged in the region of the fiber guiding element 23 or within the spinneret 2 22 is in fluid communication (with regard to possible additives 9 reference is made to the previous description).

In principle, the additive 9 can be delivered at different locations. While in FIG. 2 an embodiment is shown in which the additive delivery 22 is in the region of the inlet 4 of the spinneret 2 (so that the additive 9 can be applied to the fiber structure 3), the additive 9 can also be added to the introduced via the air nozzles 19 compressed air. The entry of the additive 9 takes place in this case for example via the air supply line 18 or said air supply chamber 17, which extends, for example, annularly around the wall bounding the vortex chamber 5 and over which the air nozzles 19 are supplied with compressed air. Finally, it is also conceivable to introduce the additive 9 via the withdrawal channel 20.

In order to be able to dispense the additive 9 precisely and moreover in an extremely reproducible manner via the additive delivery 22 and furthermore to be able to adapt the delivered volume or mass flow of the additive 9 to the respective conditions, the additive supply 8 additionally comprises at least one metering unit 16 which preferably is integrated into the corresponding additive supply line 14 and thus flows through the additive 1.

Finally shows FIG. 3 purely schematically three yarn sections. As FIG. 3a ), the yarn 6 produced during normal operation without addition of additive generally has a certain degree of hairiness, ie part of the free fiber ends and loops 10 face outward. If, on the other hand, the fiber structure 3 or the yarn 6 is wetted with additive 9, then at least a part of these fiber ends 10 attach to the remaining yarn package (see FIG FIG. 3b )), so that the additive addition by means of an optical sensor of FIG. 1 shown sensor technology can be detected, since the hairiness is lower with an additive addition than without additive addition. With the aid of the optical sensor, it is therefore fundamentally possible to qualitatively monitor an additive addition during normal and / or cleaning operation (ie to check whether an additive 9 has been added or not). The measured variable in this case could be the light reflection or absorption of the light emitted by the sensor on the yarn 6. Similarly, the shade of the yarn 6 could be monitored, which is caused by a corresponding light irradiation by the yarn 6.

Likewise, the mass of the yarn 6 can increase by an additive addition, so that it could be detected by means of a capacitive sensor of the sensor 11 and also quantitatively monitored. In this case, the capacitive sensor recognizes either the change in the yarn mass per se (ie the change in the total mass, consisting of the mass of the fiber material of the yarn 6 and the mass of the applied additive 9). Likewise, the capacitive sensor could be designed to detect only the mass of the additive 9 (which may be, for example, water). Finally, it is of course also possible that instead of absolute values only changes in the monitored parameter (s) are detected.

Finally shows Figure 3c ) schematically that the additive 9 may also be pearl-shaped, if the additive 9 is added in a pulse-like manner. In this case too, qualitative and / or quantitative monitoring of the Additive, as described in the previous description, possible, the monitoring during normal operation and in particular during the cleaning operation would be conceivable.

The present invention is not limited to the illustrated and described embodiments. Variations within the scope of the claims are also possible as any combination of the features described, even if they are shown and described in different parts of the description or the claims or in different embodiments.

LIST OF REFERENCE NUMBERS

1

spooling device

2

spinneret

3

fiber structure

4

inlet

5

swirl chamber

6

yarn

7

outlet

8th

additive supply

9

additive

10

free fiber end

11

sensors

12

Garnabfuhreinheit

13

Drafting system roller

14

Additive supply line

15

additive storage

16

dosing

17

Air supply chamber

18

Air supply line

19

air nozzle

20

culvert

21

Garnbildungselement

22

additive delivery

23

Fiber guide element

24

Off rollers

25

air exhaust

T

transport direction

Claims (12)

Method for operating an air-spinning machine, - wherein the air-spinning machine has at least one spinning station with a spinneret (2) for producing a yarn (6), - Wherein the spinneret (2) during operation of the spinning station a fiber strand (3) via an inlet (4) is fed, - Wherein the fiber structure (3) within a vortex chamber (5) of the spinneret (2) by means of a vortex air flow receives a rotation, so that from the fiber strand (3) a yarn (6) is formed, the spinneret (2) finally over leaves an outlet (7), and - During the operation of the air spinning machine with the aid of an additive supply (8) the spinning station is at least temporarily supplied with an additive (9) and applied to the fiber structure (3) and / or the yarn (6) or parts of the spinneret, characterized, that the yarn (6) leaving the outlet (7) is monitored by means of a sensor system (11) with regard to at least one physical parameter, whereby on the basis of at least one measured value supplied by the sensor system (11) and correlated with said parameter, whether and / or how much additive (9) has been applied to the fiber structure (3) or to the yarn (6) produced therefrom and passing through the sensor system (11). Method according to the preceding claim, characterized in that the manufacture of the yarn (6) is interrupted by means of a control unit when using the sensor (11) detected qualitatively and / or quantitatively deviates additive supply in a defined manner from the corresponding setpoint values. Method according to one of the preceding claims, characterized in that the sensor system (11) comprises an optical sensor by means of which the yarn (6) is monitored, for example with regard to its hairiness, based on the measured values of the optical sensor Additive is added. Method according to one of the preceding claims, characterized in that the sensor system (11) comprises a capacitive sensor, with the aid of which the yarn (6) is monitored for its mass, based on the measured values of the capacitive sensor, a quantitative monitoring of the additive supply takes place. The method according to the preceding claim, characterized in that the additive (9) is supplied in a pulsed manner, taking place the quantitative monitoring of the feed additive by evaluation of the detected by the capacitive sensor short-term mass fluctuations of the yarn (6). Method according to one of the preceding claims, characterized in that the volume flow of the added additive (9) at least temporarily an amount between 0.001 ml / min and 7.0 ml / min, preferably between 0.02 ml / min and 5.0 ml / min, more preferably between 0.05 and 3.0 ml / min, and / or that the mass flow of the added additive (9) at least temporarily an amount between 0.001 g / min and 7.0 g / min, preferably between 0, 02 g / min and 5.0 g / min, more preferably between 0.05 g / min and 3.0 g / min. Method according to one of the preceding claims, characterized in that the volume flow of the added additive (9) during a normal operation of the spinning station (8) an amount between 0.001 ml / min and 1.5 ml / min, preferably between 0.01 ml / min and 1.0 ml / min, and that the volume flow of the added additive (9) during a cleaning operation of the spinning station (8) an amount between 2.0 ml / min and 7.0 ml / min, preferably between 3.0 ml / min and 7.0 ml / min. Method according to one of the preceding claims, characterized in that the mass flow of the added additive (9) during a normal operation of the spinning station (8) an amount between 0.001 g / min and 1.5 g / min, preferably between 0.01 g / min and 1.0 g / min, and that the mass flow of the added additive (9) during a cleaning operation of the spinning station (8) an amount between 2.0 g / min and 7.0 g / min, preferably between 3.0 g / min and 7.0 g / min. Method according to one of the preceding claims, characterized in that the yarn (6) is also monitored with the aid of the sensor system (11) to determine whether the thickness and / or mass of the yarn (6) exceeds or falls below predefined limit values in a defined manner wherein the sensor system (11) is in communication with a control unit of the air spinning machine, and wherein the control unit interrupts the production of the yarn (6) if at least one of the limit values is exceeded or exceeded in a defined manner. Method according to one of the preceding claims, characterized in that the mass flow and / or volumetric flow of the added additive (9) during a cleaning operation of the spinning station is higher than during normal operation, wherein at least one of the limits mentioned in the preceding claim during the cleaning operation another Amount than during normal operation. Air spinning machine, - having at least one spinning station with a spinneret (2) for producing a yarn (6) from a spinneret (2) supplied fiber strand (3), - wherein the spinneret (2) has an inlet (4) for the fiber structure (3), an internal vortex chamber (5), - A in the vortex chamber (5) protruding Garnbildungselement (21) and - an outlet (7) for the inside of the vortex chamber (5) produced by means of a vortex air flow yarn (6), and - wherein the spinning station is associated with an additive supply (8), with the aid of the spinning station at least temporarily an additive (9) can be supplied during operation of the spinning station and applied to the fiber structure (3) and / or the yarn (6), characterized in - That the spinning station comprises a sensor (11), by means of which the yarn (6) leaving the outlet (7) can be monitored with regard to at least one physical parameter, wherein the spinning station is assigned a control unit which is designed to determine on the basis of at least one measured value supplied by the sensor system (11) and correlated with said parameter, whether and / or how much additive (9) is applied to the fiber structure (3) or the yarn (6) produced therefrom and passing through the sensor system (11) was applied. Air-jet spinning machine according to the preceding claim, characterized in that the control unit communicates with the sensor system (11) and is designed to operate the air-spinning machine taking into account the measured values transmitted by the sensor system (11) according to one of Claims 1 to 10.

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