EP1090170B1 - Spinner for spinning a synthetic thread - Google Patents

Description

The invention relates to a spinning device for spinning a synthetic Thread according to the preamble of claim 1.

This spinning device is known and in WO 95/15409 described.

Here, the freshly extruded filaments move through supports an air flow. This ensures that the freezing point of the Filaments move away from the spinneret. This leads to a delayed Crystallization, which is beneficial to the physical properties of the thread effect. For example, when manufacturing a POY yarn, the Take-off speed and thus the stretching can be increased without for the yarn the elongation values required for further processing change.

The known spinning device consists of a cooling tube and a Airflow generators, which are arranged below the spinneret. Between the Spinneret and the cooling tube is an inlet cylinder with gas permeable Wall arranged. By the interaction of the inlet cylinder and the Airflow generator is introduced an amount of air within the cooling shaft and within the cooling tube into an accelerated air flow in Thread running direction. The inlet cylinder consists of a perforated, gas permeable material. This is the amount of air flowing in radially proportional to the applied pressure difference, which increases with increasing Filament speed increased. Thus, with increasing Distance from the spinneret is the amount of air entering the inlet cylinder greater.

However, it has now been shown that in addition to supporting locomotion the filaments must be evenly consolidated in their outer layers. At the Passing through the inlet cylinder, the filaments are pre-cooled in such a way that the boundary layer has solidified before entering the cooling tube. In essence, they are Filaments still melt when entering the cooling tube, so that the final Solidification takes place only in the cooling pipe. This is why there is even pre-cooling of all filaments required. Furthermore, it must be achieved that the uniform cross-section of the intake cylinder is present so that every single filament in the cooling tube is even in its Locomotion is supported.

When manufacturing a thread, the quality of the thread is determined by the Interaction of the filament properties determined. It is therefore known that for Production of a high quality yarn of every filament within one Filament bundle must undergo the same treatment. With the known The method and the known device becomes conscious of the freezing point of the spinneret moves away so that the only after passing through a pre-cooling zone Solidify filaments in the cooling zone formed by the cooling tube. In order to the filaments pass through a relatively large distance in which they are exposed to different air currents.

From US 5,034,182 a spinning device is known in which the inlet cylinder is arranged in a pressure chamber. The inlet cylinder has a sieve-shaped wall, so that due to the excess pressure prevailing on the outside of the inlet cylinder, a larger pressure difference and thus a larger inflowing amount of air is achieved. However, this leads to the problem that the filaments are already exposed to a considerable cooling effect within the inlet zone.
EP 0 580 977 or DE 195 35 143 also describe spinning devices. In these known spinning devices, the inlet cylinder is designed below the spinneret with an air permeability which changes in the direction of the thread in order to obtain a cooling of the filaments as a function of the speed of the thread. The known spinning devices aim at a complete cooling of the filaments within the inlet cylinder and are therefore unsuitable for producing an air flow which supports filament movement with only pre-cooled filaments.

No. 5,219,582 A also describes only one device for radial Quenching filaments spun from a melt with the aid of a Quenching chamber surrounded by a gas permeable cylinder. Whose gas-permeable pores have different sizes in the thread running direction Diameter, so that with the help of different sized pores the gas flow for cooling the filaments can be influenced. A targeted generation of an air flow supporting the thread movement in the thread running direction does not take place.

CH 678 433 A discloses a spinning device for cooling, stabilizing and preparing melt-spun filaments. Again, mainly a radial inflow of the filaments causes.

In contrast, it is an object of the invention to provide a spinning device mentioned type in such a way that a uniform pre-cooling the amount of air matched to the filaments and one to support the Filament movement required amount of air can be provided.

Another object of the invention is the above-mentioned spinning device to further develop such that all filaments of a filament bundle to solidification receive a substantially uniform treatment.

This object is achieved by a spinning device with the Features of claim 1 solved.

The Inlet cylinder is in the thread running direction in several zones each different gas permeability to control the in the inlet cylinder incoming air volume divided. This means that regardless of the Filament speed and regardless of the differential pressure between the Spinnschacht and the environment flowing into the spinning shaft Air volume can be influenced. This makes it possible to target the Properties of the filaments exert influence from different zones the spinneret. The influence can be on the one hand that all Filaments should be precooled if possible under the same cooling conditions Preservation of the marginal zones. Furthermore, the arrival of the Filaments in the cooling tube as well as the formation of the air flow in the cooling tube due in particular to those entering in the lower region of the inlet cylinder Influence air volume. The one entering through the wall of the intake cylinder The amount of air is proportional depending on the gas permeability or Porosity of the wall. If the gas permeability is high, a larger amount of air per unit of time in otherwise constant conditions initiated the spinning shaft. In the opposite case, the smaller occurs Gas permeability of the wall a relatively smaller amount of air in the Spinning shaft.

The particularly advantageous development of the spinning device according to claim 2 has the advantage that a relatively large amount of air for cooling the filaments is available. Another advantage is that a substantially uniform air volume distribution within the spinning shaft established. Because in the upper area the filament speed is low and also the filaments are relatively wide due to the small distance to the spinneret are spaced from each other in the upper zone of the inlet cylinder Air flow is essentially unimpeded over the entire Distribute spinning shaft cross-section. This ensures that within the Filament bundle form a uniform air flow in the cooling tube can.

The embodiment of the invention according to claim 3 is particularly suitable to treat the filaments in a relatively weak pre-cooling. Thereby there is the advantage of a particularly gentle cooling, which is another Improving spinning security means. Here under the spinning security understood the quantity of filament breaks. In the one facing the cooling pipe However, the lower zone will have a relatively large amount of air in the spinning shaft initiated, which facilitates the entry of the filament bundle into the cooling tube. This advantageously makes striking the filaments against the tube wall in the Prevents area of the narrowest cross section.

However, the gas permeability of the upper zone can be reduced in this way that the upper zone becomes gas impermeable. This creates a quiet zone formed immediately below the spinneret, which a stable spinning of the Filaments guaranteed and thus the formation of a uniform Favored filament structure.

The particularly advantageous development of the spinning device according to claim 5 has the advantage that both an even air volume distribution inside the spinning shaft and thus also a uniform pre-cooling of the Filaments is reached and on the other hand the filaments run into the Cooling pipe favors. Because in the middle of the inlet cylinder relatively little Air entering the spinning shaft can already be in the direction of the thread Form aligned air flow based on filament speed. Due to the amount of air fed into the cooling pipe immediately before entering an essentially uniform attack on each filament Airflow off.

As the distance from the spinneret increases the filament speed increases and at the same time the distance between the individual filaments is reduced in a particularly advantageous embodiment of the invention Gas permeability of the inlet cylinder within a zone in the thread running direction equal. The amount of air entering the spinning shaft is thus within the Zone depending on the filament speed. That is, at higher Thread speed, more air is fed to the spinning shaft.

The embodiment of the invention according to claim 7, on the other hand, enables Length of the inlet cylinder to generate a flow profile, which none contains gradual changes in the air supply. Furthermore, thereby achieve that the amount of air entering the spinning shaft regardless of the thread speed essentially over the length of the Zone can be kept the same.

The wall of the inlet cylinder can be made from any porous Create material. In particular, the training according to claim 8 of Advantage. Here, the gas permeability or the air resistance within the wall can be specified very precisely. The gas permeability is in this case about the number of inlet openings of the perforations and about the Defined diameter of the inlet openings of the perforations.

The design of the spinning device according to claim 8 is particularly suitable to generate an air flow that supports filament movement. Here is the perforation of at least one zone from a multiplicity of inlet openings formed, the wall of the inlet cylinder obliquely with an inclination to Penetrate the thread running direction, that one directed in the thread running direction Airflow enters the intake cylinder.

The particularly advantageous further development according to claim 10 achieves that. A high uniform over the entire circumference of the inlet cylinder radial air flow is generated.

In order to be able to form the zones within the inlet cylinder, the Execution of the invention according to claim 11 is particularly advantageous. in this connection can single cylinders with the same or with different Gas permeability must be placed one above the other. This can be done through different Mesh sizes of the wire mesh or by different multilayer of the Locations can be reached.

Furthermore, the training according to claim 12 offers the possibility of Change gas permeability using a paper sleeve. Here there is the advantage that the paper sleeve performs an air filtering, so that none Contamination can get into the spinning shaft.

To create a uniform flow in the intake cylinder and around Further training is to avoid turbulence when entering the intake cylinder the spinning device according to claim 13 is particularly advantageous. Here are at the Wall inside the inlet cylinder in the area of at least one zone several baffles attached that slope from the wall in Have the thread running direction.

In a particularly advantageous development of the invention Inlet cylinder connected to the spinneret for heat transfer. So you can especially warm the upper zone of the intake cylinder, which in turn leads to Heating of the air flowing through the wall leads so that a shock-like cooling effect on the filaments is prevented.

In the embodiments of the invention described above, the Airflow generator through a fan in the area of the intake cylinder, through a Injector immediately before entering the cooling tube or through a suction device, which is connected to the cooling pipe on the outlet side of the cooling pipe. The suction device has the particular advantage that all during Spinning emerging particles such as monomers from the Spinning shaft to be removed. This will contaminate the Avoided spinning shaft.

In order to produce a thread with very high uniform quality, the Spinning device according to claim 16 is particularly advantageous. Through the arrangement of the nozzle bores according to the invention within the spinneret is achieved in the cooling tube on each filament rectified and attack air flows of the same size pointing in the direction of the thread.

In a spinning device known from DE 25 39 840 a even air flow used to treat the filaments in the direction, transversely or counter to the thread running direction. However, that applies to them spinning device according to the invention not. By the in the cooling tube prevailing vacuum atmosphere according to the invention becomes a Air flow in the direction of the thread with one depending on the tube cross-section Flow profile generated with different flow rates.

The spinning device according to the invention has the advantage that the prevailing flow profile of the air flow in the pipe cross section is used to arrange the nozzle bores in the spinneret. There the filaments within the cooling tube as they travel through the Supporting filament attacking airflow, it is special Meaning that a substantially uniform over the entire route Support the locomotion with each of the filaments. The flow profile of the air flow which is established in the tube is of the Inlet geometry of the cooling pipe and the internal nature of the Cooling tube to the last of the diameter of the cooling tube and the type of flow dependent. This can differ within the pipe cross-section Form flow velocities that are evenly distributed Filaments inevitably become one within the tube cross-section would result in different treatment. Thus, the invention offers one Possibility of arranging the filaments within the filament bundle in such a way that each filament with substantially the same flow rate through the Cooling pipe is guided.

The particularly preferred development of the spinning device according to claim 18 has the advantage that the filament bundle is securely inserted into the cooling tube and that there is a less turbulent air flow in the entrance area of the Forms cooling tube. It was found that the air flow inside the cooling tube has a flow profile that tends to be in the middle of the Cooling tube has a maximum flow rate. Through the Formation of the spinneret according to claim 18 is thus avoided that Enter filaments in the middle of the cooling tube.

In the case of an oval or round pipe cross section, the formation of the Spinning device according to claim 19 particularly suitable for the filaments in Lead zones of equal flow velocities through the cooling pipe. at the arrangement of the nozzle holes in a closed row of holes also achieved that within the inlet cylinder, the Pre-cooling is achieved.

The formation of the spinning device according to claim 20 is particularly of Advantage for evenly pre-cooling with several rows of holes to reach.

In a particularly advantageous development of the spinning device Filaments with a substantially equal distance from the wall of the Inlet cylinder led. This is an additional equalization of the Pre-cooling and thus reproducible solidification of the surface layer achieved. To provide a flow profile in the cooling tube which is favorable for the production of the thread achieve, it has been found that the distance between the spinneret and the cooling pipe at least 100 mm to max. Should be 1000 mm. in this connection the cooling tube has a diameter in the area of the narrowest Pipe cross-section from a minimum of 10 mm to a maximum of 40 mm.

To further delay the crystallization of the filaments and thus a thread To produce with higher elongation values is the formation of the Spinning device according to the invention according to claim 23 is particularly advantageous. Here is a heater between the spinneret and the inlet cylinder provided for the thermal treatment of the filaments.

The same effect is also due to the advantageous development of Spinning device according to claim 24 achievable. Here the ambient air outside the circumference of a zone, preferably the upper zone Inlet cylinder heated to a temperature of 35 ° C to 350 ° C. By in Warm air entering the inlet cylinder becomes the filaments before actual cooling depending on the air temperature thermally treated.

The spinning devices according to the invention are suitable for textile threads or Manufacture technical threads from polyester, polyamide or polypropylene. It can use different treatment facilities for the thread downstream, for example, a fully drawn thread (FDY), a pre-oriented thread (POY) or a highly oriented thread (HOY) manufacture. The following will refer to the attached Drawings of some embodiments of the invention Spinning devices described in more detail.

Fig. 1

eine erfindungsgemäße Spinnvorrichtung mit nachgeschalteter Aufspuleinrichtung;

Fig. 2

einen Einlaßzylinder der in Fig. 1 gezeigten Spinnvorrichtung;

Fig. 3

verschiedene Wandausführungen des Einlaufzylinders mit entsprechendem Strömungsprofil;

Fig. 4

ein weiteres Ausführungsbeispiel der erfindungsgemäßen Spinnvorrichtung.

Fig. 5

ein Beispiel eines Strömungsprofils innerhalb des Kühlrohres der in Fig. 1 gezeigten Spinnvorrichtung;

Fig. 6

mehrere Ausführungsbeispiele einer Spinndüse;

They represent:

Fig. 1

a spinning device according to the invention with a downstream winding device;

Fig. 2

an inlet cylinder of the spinner shown in Fig. 1;

Fig. 3

different wall designs of the inlet cylinder with appropriate flow profile;

Fig. 4

a further embodiment of the spinning device according to the invention.

Fig. 5

an example of a flow profile within the cooling tube of the spinning device shown in Fig. 1;

Fig. 6

several embodiments of a spinneret;

In Fig. 1 is a first embodiment of an inventive Spinning device shown for spinning a synthetic thread.

A thread 12 is spun from a thermoplastic material. The Thermoplastic material is used in an extruder or a pump melted. The melt is via a melt line 3 by means of a Spinning pump conveyed to a heated spinning head 1. At the bottom of the Spinning head 1, a spinneret 2 is attached. The emerges from the spinneret 2 Melt in the form of fine filament strands 5. The filaments 5 pass through a spinning shaft 6, which is formed by an inlet cylinder 4. For this purpose, the inlet cylinder 4 is immediately below the spinning head 1 arranged and encloses the filaments 5. At the free end of the inlet cylinder 4th is followed by a cooling tube 8 in the thread running direction. The cooling tube 8 is over an inlet cone 9 connected to the inlet cylinder 4. On the opposite side of the inlet cone 9, the cooling tube 8 has a Outlet cone 10, which opens into an outlet chamber 11. On the bottom the outlet chamber 11 is an outlet opening 13 in the plane of the thread Outlet chamber 11 introduced. On one side of the outlet chamber 11 opens Suction nozzle 14 into the suction chamber 11. Via the suction nozzle 14, one is free End of the suction nozzle 14 arranged air flow generator 15 with the Outlet chamber 11 connected. The air flow generator 15 is a suction device educated. The suction device 15 can for example be a vacuum pump or have a blower which has a negative pressure in the outlet chamber 11 and thus generate in the cooling tube 8.

In the thread running plane below the outlet chamber 11 there are one Preparation device 16 and a winding device 20 are arranged. The Winding device 20 consists of a head thread guide 19. Der Head thread guide 19 indicates the beginning of the traversing triangle, which is indicated by the Movement of a traversing thread guide of a traversing device 21 arises. A pressure roller 22 is located below the traversing device 21 arranged. The pressure roller 22 lies on the circumference of a coil 22 to be wound on. The coil 23 is produced on a rotating winding spindle 24. The For this purpose, winding spindle 24 is driven by spindle motor 25. The drive the winding spindle 25 is depending on the speed of the Pressure roller controlled so that the peripheral speed of the coil and hence the take-up speed during take-up essentially remains constant.

There is a between the preparation device 16 and the winding device 20 Treatment device 17 for treating the thread 12 interposed. In the embodiment shown in Fig. 1, the Treatment device 17 is formed by a swirling nozzle 18.

Depending on the manufacturing process, Treatment facility one or more unheated or heated godets be arranged so that the thread in its tension before winding can be influenced or stretched. There is also the possibility additional heating devices for stretching or relaxation within the To arrange treatment device 17.

In the spinning device shown in Fig. 1, a polymer melt is used for Spinning head 1 conveyed and through the spinneret 2 into a variety of filaments 5 extruded. The bundle of filaments is drawn off the winding device 20. Here, the filament bundle passes through the with increasing speed Spinning shaft 6 within the inlet cylinder 4. Then that occurs Filament bundles into the cooling tube 8 via the inlet cone 9. In the cooling tube 8 a negative pressure is generated via the suction device 15. This will make the outside Ambient air present at the inlet cylinder 4 into the spinning shaft 6 sucked. The amount of air entering the spinning shaft 6 is here proportional to the gas permeability of the wall 7 of the inlet cylinder. The inflowing air leads to a pre-cooling of the filaments, so that the Solidify the outer layers of the filaments. At the core, however, the filaments remain molten. The amount of air is then together via the inlet cone 9 sucked into the cooling tube 8 with the filament bundle. The air flow will due to a narrowest cross section in the cooling tube 8 under the effect of Suction device 15 accelerated so that none of the cooling tube Filamen movement counteracting air flow is more present. In order to the load on the filaments is reduced.

In order to minimize turbulence in the outlet area of the cooling tube 8 generate, the air flow via the outlet cone 10 into the outlet chamber 11 initiated. In the outlet chamber 11 is a for further air calming Screen cylinder 30 is arranged, which encloses the filament bundle. The air will then via the nozzle 14 and the suction device 15 from the outlet chamber 11 sucked and discharged. The filaments 5 appear on the underside of the Outlet chamber 11 through the outlet opening 13 and run into the Preparation device 16 a. Until the filaments emerge from the cooling tube the filaments cool down completely. Through the Preparation device 16, the filaments become a thread 12 merged. To increase the thread closure, the thread 12 is in front of the Winding swirled through a swirl nozzle 18. In the Winding device, the thread 12 is wound into the bobbin 23. At the in 1 arrangement can for example produce a polyester thread be wound up at a winding speed of> 7,000 m / min becomes.

The spinning device shown in Fig. 1 is characterized in that the in The amount of air entering the inlet cylinder for the heat treatment of the filaments is voted. The pre-cooling and the suction flow can be advantageous to be influenced. 2, the inlet cylinder 4 from FIG. 1 is shown again. The wall 7 of the inlet cylinder 4 is a perforated plate with two different perforations 29 and 26 formed. In an upper zone on the End of the inlet cylinder, which faces the spinneret 12, is one with Small diameter trained holes 29 introduced. The perforation leads in the upper zone to a schematically indicated flow profile 28. Das Flow profile 28, which is symbolized by arrows, gives a measure of the in the amount of air entering the spinning shaft 6. The perforation 29 is within the upper zone equal. The amount of air increases with increasing Distance from the spinneret due to the negative pressure effect in the cooling tube 8 and due to the increasing filament speed.

In a lower zone, which is formed at the end facing the cooling tube 8 is, the wall 7 has a perforation with a larger opening cross-section. How represented by the symbolized flow profile 27 is in the lower zone a larger amount of air enter the spinning shaft 6. Here too is the The tendency is recognizable that with increasing distance from the spinneret inflowing air volume increases.

The flow profile shown in Fig. 2 is over the wall of the inlet cylinder particularly suitable for slow and low pre-cooling of the filaments receive. This leads in particular to a very uniform thread cross-section. In Fig. 3 further embodiments of an inlet cylinder are shown, the Wall 7 is formed to different flow profiles. The wall 7 is formed in the permeable zones by a wire mesh. The However, wire mesh can also be advantageous through any other porous material such as a sintered material.

In the embodiment shown in Fig. 3.1, the inlet cylinder is in a upper and a lower zone divided. The upper zone I has a larger one Gas permeability than the lower zone II. The resultant Flow profile leads to a larger amount of air in the upper zone I. occurs as in the lower zone II. Such an arrangement is special advantageous to have a high uniform cooling effect and a uniform To achieve air volume distribution within the spinning shaft. Especially in In the upper zone I the filament speed is relatively low and the distance between the filaments relatively large, so that the amount of air in the Can distribute spinning shaft. As already described for FIG. 2, this also occurs an increase in the amount of air within a zone due to the constant gas permeability

In the embodiment shown in Fig. 3.2, an upper zone I, a middle zone II and a lower zone III. Here is in the middle zone II a relatively small amount of air is directed into the spinning shaft. In contrast, the air volume is greater in the upper zone I and the lower zone III executed. This arrangement favors both the air volume distribution inside the spinning shaft as well as the run-in behavior of the filament bundle in the cooling pipe. Due to the large amount of air in the lower zone III this is Filament bundles constricted more strongly when entering the cooling tube, so that none Filaments can hit the walls. The wall of zones II and III is designed in such a way that it is uniform over the length of the zone Air volume distribution. For this purpose, the gas permeability in the The wall decreases with increasing distance from the spinneret.

In Fig. 3.3 an embodiment is shown in which an upper zone I of the Inlet cylinder 4 has a gas-impermeable wall 7. The lower zone II has a triangular flow profile, with the largest amount of air enters the spinning shaft 6. This arrangement is special suitable to first of all a uniform formation of the filament strands in the Get rest area. Only when the filaments melt in the Having solidified the outside area, there is an air flow in the cooling shaft directed. This arrangement is particularly suitable for threads with low To produce thread titers.

In the embodiment of the spinning device shown in FIG. 4, between the Inlet cylinder 4 and the spinner 1, a heater 31 is arranged. The Heating device 31 leads to a thermal treatment of the filaments, so that further slowed cooling occurs. In this shown in Fig. 4 The heater can be arranged with any previously described embodiment of the intake cylinder can be combined. The inlet cylinder 4 has an upper one Zone with the perforation 37 and a lower zone with the perforation 26. by virtue of the different hole diameters of the holes 37 and 26 result the sybolized flow profiles 28 and 27. Thus occurs in the upper Zone of the intake cylinder 4 a smaller amount of air than in the lower zone of the Inlet cylinder 4 in the inlet cylinder 4. Compared to the one before Exemplary embodiments of the spinning device described in FIG. 4 shown embodiment of the air flow entering the inlet cylinder 4 in Direction of thread running, so that the filaments move in the direction of the cooling tube 8 directly with the entry of the air quantity with large Flow component are supported. For this purpose, the inlet openings 38 the perforation 37 in the upper zone of the inlet cylinder 4 obliquely with a Inclination in the thread running direction introduced into the wall 7. The length and the For this purpose, the diameter of the inlet opening 38 is in a predetermined ratio so forceful that there is a directional flow upon entry into the inlet cylinder 4 trains. The lower zone of the inlet cylinder 4 has a perforation 26 radially directed inlet openings 38. Inside the inlet cylinder 4 are several baffles 39 attached to the wall 7. The baffles 39 protrude from the wall 7 with an inclination in the thread running direction inside the Inlet cylinder 4 into it. Thus, the one entering through the perforation 26 Amount of air in the lower zone of the intake cylinder 4 into a flow in Thread direction transferred. To optimize the flow conditions in the Inlet cylinder 4, the guide plates 39 could also be adjusted in their inclination be executed.

Basically, it is noted that the inlet cylinder in a variety can be divided by zones to create an even flow profile receive. In addition, by varying the combination of perforation and baffles In the inlet cylinder another possibility is given to the flow of the cooling air and to influence the cooling of the filaments in the cooling tube.

So that all filaments of the filament bundle within the cooling tube one in get essential equal support for their locomotion, it is required that the filaments be of an air flow with essentially same flow rate are surrounded. In Fig. 5 is an example Flow profile 32 shown, for example, in the middle of the Cooling tube 8 of the spinning device according to FIG. 1 tends to set. Through the The length of the arrows is the flow velocity of the air flow inside the flow profile or the cooling tube. Here shows the air flow generated by the suction device in the central region of the Cooling tube 8 a maximum flow rate. Therefore, the Filaments guided for example on a pitch circle D1 or a pitch circle D2. For this it is necessary that the nozzle bores have a corresponding one Obtain arrangement within the spinneret 2.

In Fig. 6 are several embodiments of nozzle bore arrangements shown within the spinneret 2. A spinneret 2 is shown in FIG which arranged the nozzle holes 33 in a row 34 of holes are. The nozzle bores 33 are each the same in the row 34 of bores Distance introduced to each other in the spinneret. Through the closed Bore row 34 is formed in the central region of the spinneret Entry zone 35 included.

6.2 shows another spinneret 2, in which two Bore rows 34 and 36 are introduced in a ring shape in the spinneret. The Nozzle bores 33 of the two rows of bores 34 and 36 are of this type staggered that the nozzle holes of the inner Bore row 36 each between two adjacent nozzle holes outer row of holes 34 are arranged. The spinneret from Fig. 6.1 and the spinneret of Fig. 6.2 are in their nozzle bore arrangements on the 5 designed flow profile in the cooling tube. The interpretation is based here that the cooling tube 8 of FIG. 1 has a circular cross section having. The flow profile thus also leads to a circular one Arrangement of the nozzle bores. When using a cooling pipe with an oval cross section or a square cross section would inevitably result in different flow profiles, resulting in a changed Arrangement of the nozzle bores within the spinneret leads.

When producing a polyester thread with a thread titer of 2.4 dtex the spinning device according to FIG. 1 was used. This was compared a spinneret with a flat arrangement of the nozzle bores and a spinneret used according to the embodiment of FIG. 1. Overall, both were spinnerets 55 executed with nozzle bores. The nozzle bores were within one Pitch circle of 60 mm. The cooling pipe was in the narrowest pipe cross section with a smallest diameter of 16 mm. The distance between the Spinneret and the cooling tube was 260 mm. The cooling pipe was over one Inlet cone 75 mm long connected to the inlet cylinder. The Winding speed was 6,000 m / min. In the direct comparison found that the spinneret with areal distribution of the nozzle bores a thread that showed a very high fluidity. The thread had one Cook shrinkage of 9.6% and an elongation of 62%. In which inventive method with the annular A nozzle bore assembly was made of a thread that did not form lint showed. The cooking shrinkage was 3.1% and the elongation was 56%. With that lies the particular advantage of the method according to the invention and the Device according to the invention in that a high quality thread with high spinning security can be produced.

The invention is not related to any particular shape of the intake cylinder and of the cooling tube limited. The round shapes shown in the versions are exemplary and can be easily with oval training or with rectangular spinnerets even angular designs of the inlet cylinder and Cooling tube to be replaced. The spinneret is accordingly in theirs Variable design.

LIST OF REFERENCE NUMBERS

1

spinning head

2

spinneret

3

melt line

4

intake cylinder

5

filaments

6

spinning shaft

7

wall

8th

cooling pipe

9

inlet cone

10

discharge cone

11

outlet chamber

12

thread

13

outlet

14

suction

15

suction

16

preparation device

17

treatment facility

18

swirl jet

19

Yarn guide

20

spooling

21

Traversing device

22

pressure roller

23

Kitchen sink

24

winding spindle

25

spindle drive

26

perforation

27

inflow profile

28

inflow profile

29

perforation

30

screen cylinder

31

heater

32

flow profile

33

nozzle bores

34

row of holes

35

inlet zone

36

row of holes

37

perforation

38

inlet opening

39

baffle

Claims (24)

1. Apparatus for spinning a synthetic yarn (12), which is formed by combining a plurality of individual filaments (5), and which is wound to a package (23) by means of a takeup device (20) downstream of the spinning apparatus, the spinning apparatus comprising a spinneret (2), which has on its underside a plurality of nozzle bores for extruding the filaments (5); a cooling tube (8) downstream of the spinneret (2), through which the filaments for the purpose of cooling down advance and which comprises an inlet cone (9) for accelerating an air stream in direction of the advancing yam; an air stream generator (15) for the generation of an air stream within the cooling tube (8) which is connected to the cooling tube (8) in such a manner that the air stream can be generated in the cooling tube (8) in direction of the advancing yam; and a gas-permeable inlet cylinder (4) arranged between the spinneret (2) and the cooling tube (8), through which the filaments (5) advance, and through which a substantially radially inflowing quantity of air is supplied to the inlet cone (9) for generating the air stream within the cooling tube (8), characterized in that the inlet cylinder (4) is divided in direction of the advancing yarn into several zones, each zone having a different permeability to gas of a wall (7) for controlling the quantity of air entering inlet cylinder (4) and to provide the air stream supporting the advance of the filaments only for pre-cooled filaments (5).
2. Spinning apparatus according to claim 1, characterized in that the inlet cylinder (4) comprises an upper zone facing the spinneret (2) and a lower zone facing the cooling tube (8), and that the upper zone is made with a greater gas permeability in the wall (7) than the lower zone.
3. Spinning apparatus according to claim 1, characterized in that the inlet cylinder (4) comprises an upper zone facing the spinneret (2) and a lower zone facing the cooling tube (8), and that the upper zone made with smaller gas permeability in the wall (7) than the lower zone.
4. Spinning apparatus according to claim 3, characterized in that the wall (7) of the upper zone is made impermeable to gas.
5. Spinning apparatus according to one of claims 2 to 4, characterized in that at least one intermediate zone is formed between the upper zone and the lower zone, and that the intermediate zone is made with a smaller permeability to gas in the wall (7) than the lower zone and/or the upper zone.
6. Spinning apparatus according to one of the foregoing claims, characterized in that the permeability to gas of the wall (7) of inlet cylinder (4) is identical within a zone in direction of the advancing yarn.
7. Spinning apparatus according to one of the foregoing claims, characterized in that the gas permeability of the wall (7) of inlet cylinder (4) differs within a zone in direction of the advancing yarn.
8. Spinning apparatus according to one of the foregoing claims, characterized in that the wall (7) of inlet cylinder (4) is formed from a perforated sheet element with a zonewise different perforation (26, 29, 37).
9. Spinning apparatus according to claim 8, characterized in that the perforation (37) of at least one zone consists of a plurality of inlet openings (38) that extend obliquely through the wall (7) of inlet cylinder (4) with an inclination toward the direction of the advancing yam such that an air stream directed in the direction of the advancing yam enters the inlet cylinder (4).
10. Spinning apparatus according to one of claims 1 to 7, characterized in that a wire cloth with a zonewise different mesh size forms the wall (7) of inlet cylinder (4).
11. Spinning apparatus according to claim 8 or 10, characterized in that several perforated sheet elements and/or wire cloths are combined one after the other in the wall of the inlet cylinder.
12. Spinning apparatus according to one of claims 8 to 11, characterized in that a paper sleeve lies against the wall (7) of inlet cylinder (4) in circumferential contact therewith.
13. Spinning apparatus according to one of the foregoing claims, characterized in that the wall (7) mounts in the interior of the inlet cylinder (4), in the region of at least one zone, several baffles (39) that extend from the wall (7) with an inclination in direction of the advancing yarn.
14. Spinning apparatus according to one of claims 1 to 13, characterized in that the inlet cylinder (4) connects in a heat-transferring manner to a spin head (1) mounting the spinneret (2).
15. Spinning apparatus according to one of the foregoing claims, characterized in that the air stream generator (15) is a suction device that connects to the cooling tube (8) on the outside thereof.
16. Spinning apparatus according to one of claims 1 to 15, characterized in that the arrangement of the nozzle bores (33) in the spinneret (2) is selected such that the air stream generated as the filaments enter the cooling tube (8) assists the filaments (5) in their advance uniformly over the tube cross section and cools same evenly.
17. Spinning apparatus according to claim 16, characterized in that the air stream generator is a suction device (15) that connects to the cooling tube (8) at the outlet end of said cooling tube (8) such that an air stream is generated in the cooling tube (8) in direction of the advancing yarn.
18. Spinning apparatus according to claim 16 or 17, characterized in that at its inlet end, the cooling tube (8) comprises a funnel-shaped inlet cone (9), and that the nozzle bores (33) are arranged around an inlet zone (35) that forms in the center of the filament bundle.
19. Spinning apparatus according to claim 18, characterized in that the inlet zone in the spinneret (2) is formed by one or more lines of bores (34, 36) each closed in itself with a plurality of equally spaced nozzle bores (33).
20. Spinning apparatus according to claim 19, characterized in that the nozzle bores (33) of adjacent lines of bores (34, 36) are offset from one another in direction transverse of the spinneret (2).
21. Spinning apparatus according to one of claims 16-20, characterized in that the nozzle bores (33) are annularly arranged in such a manner that the filaments (5) of the filament bundle enter the inlet cylinder (4) at a substantially equal distance from the wall (7) of the inlet cylinder (4).
22. Spinning apparatus according to one of the foregoing claims, characterized in that the spacing between of spinneret (2) and cooling tube (8) is from at least 100 mm to at most 1000 mm, and that the cooling tube has in its narrowest cross section a diameter from at least 10 mm to at most 40 mm.
23. Spinning apparatus according to one of the foregoing claims, characterized in that a heating device (31) for thermally treating the filaments is arranged between the spinneret (2) and the inlet cylinder (4).
24. Spinning apparatus according to one of claims 1-22, characterized in that the ambient air surrounding the circumference of at least one zone of inlet cylinder (4) has a temperature from at least 35°C to at most 350°C.

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