EP2527502B1 - Apparatus for taking off and drawing a synthetic yarn - Google Patents

Description

The invention relates to a device for drawing and drawing a synthetic thread in a melt spinning process according to the preamble of claim 1.

A generic device is from the WO 2011/009497 known.

The known apparatus for stripping and stretching a synthetic thread is used in a melt spinning process to draw one or more threads after melt spinning. For this purpose, one or more threads is guided through an array of multiple godets for stripping and stretching. There are two following in the yarn path godets combined to form a pair of godets, the electric motors of the godets are jointly controlled by an associated control unit. In order to guide the thread or threads, each with a Teilumschlingung to the guide shells, the electric motors are formed by clockwise and counterclockwise motors, which are assigned to the godets alternately. Thus, the godets of the godet godet are driven by a left-hand motor and a right-hand motor, both of which are controlled by the control unit.

In the known device, the stretching forces required for stretching are generated by a differential speed, which is adjustable between the godets of the godet duo. In that regard, the speed difference can be changed by changing the guiding speeds of the godets of the first godet or by changing the guiding speed of the godets of the second godet. Since the known device is used within a melt spinning process, such changes are effective the guide speeds are instantaneous to upstream or downstream thread guides within the melt spinning process. In that regard, a stretching of the threads is possible only in coordination of all treatment steps of the entire process.

It is an object of the invention to develop the generic device for pulling and drawing a synthetic thread such that the stretching of the threads with higher flexibility is possible regardless of subsequent or upstream thread guides.

This object is achieved in that between the godets the godet pair is arranged a single drivable and controllable godet.

Advantageous developments of the invention are defined by the features and feature combinations of the respective subclaims.

The invention has the particular advantage that within the melt spinning process, a withdrawal tension generated on a thread is adjustable independently of a drawing of the thread. The deduction of the thread and the stretching of the thread can be advantageously set independently and individually by the godets of the first godet godet and the individually controllable godet. Thus, for example, a Vorverstreckung can be realized in which a speed difference is set between the first pair of godets and the individually controllable godet. In addition, the draw tension for drawing the thread is essentially determined by the difference in speed between the individually controlled godet and the godets of the second godet tail. Here, the thread can optionally lead in several wraps or with simple Teilumschlingung on the godets of the godets duo.

Preferably, however, the development of the invention is carried out, in which the electric motors are formed by several anti-clockwise and right-hand motors and in which the following in the yarn course godets are alternately assigned to one of the left-hand motors and one of the clockwise motors. This development is particularly suitable for guiding a plurality of threads parallel next to each other, without long projecting guide coats of godets are required.

For the removal of the thread from a spinning device, the development has proven in which the first godet of the first Galettenduos forms a Abzugsgalette with an unheated guide shell, which is smaller in the guide diameter than the guide sheath of the second galette of Galettenduos. This allows a speed difference to be advantageously set between the godets of the first godet tail, which contributes to the stability of the yarn path. On the other hand, an intensive contact after the removal of the thread on the following godets can be realized immediately in order to obtain an intensive thermal treatment of the thread on the heated guide shells.

In order to exploit the structural advantages of an unheated guide jacket of a first godet by appropriate compact design, the development of the invention is particularly advantageous in which the electric motors of the two godets of the first godet have a disproportionately large number of pole pairs. This even makes it possible to operate both godets of the first godet in spite of different guide diameter of the guide shells with the same size peripheral speed.

In order to realize the required plastic change in the thread immediately after the removal of the thread in preparation for drawing, it is further provided that the second godet of the first godet tail has a heated guide shell.

The thermal treatment of the thread can advantageously be improved by the fact that the godet between the godet godets also has a heated guide shell.

In order to be able to perform a slight relaxation in addition to the drawing of the thread, the development of the invention is particularly advantageous, in which the godets of the second godet have two heated guide shells, which are formed unequally large in the guide diameter. Thus, by the difference in diameter of the guide diameter of both godets on the godet duo a speed difference can be generated, which leads to a thread tension reduction between the godets. In this case, the associated electric motors can be operated together with a setpoint frequency.

In the event that an intensive shrinkage treatment in the melt spinning process is required, the development of the invention is preferably used, in which a godets of the second Galettenduos downstream Relaxiergalette is provided, which is individually driven and controllable. This allows any speed differences to produce stress relief after stretching the thread.

The device according to the invention is particularly suitable for drawing synthetic threads for textile applications. Thus, fully drawn threads (FDY) can be produced, which are in a speed range of 1,200 m / min. up to 6,000 m / min. be guided and stretched. However, it is also possible to use the device according to the invention for drawing technical threads. Here, the individually controlled godets can be preceded or arranged by several godets.

The invention will be explained in more detail with reference to some embodiments of the device according to the invention with reference to the accompanying figures.

Fig. 1

schematisch eine Galettenanordnung eines ersten Ausführungsbeispiels der erfindungsgemäßen Vorrichtung

Fig. 2

schematisch eine Galettenanordnung eines weiteren Ausführungsbeispiels der erfindungsgemäßen Vorrichtung

Fig. 3

schematisch eine Querschnittansicht eines Galettenduos gemäß dem Ausführungsbeispiels nach Fig. 2

Fig. 4

schematisch eine Ansicht einer Schmelzspinnanlage mit einem weiteren Ausführungsbeispiel der erfindungsgemäßen Vorrichtung

They show:

Fig. 1

schematically a godet assembly of a first embodiment of the device according to the invention

Fig. 2

schematically a godet assembly of another embodiment of the device according to the invention

Fig. 3

schematically a cross-sectional view of a Galettenduos according to the embodiment according to Fig. 2

Fig. 4

schematically a view of a melt spinning plant with a further embodiment of the device according to the invention

In the Fig. 1 a godet assembly of a first embodiment of the device according to the invention is shown schematically.

The exemplary embodiment has two godets 1.1 and 1.2, which are arranged one behind the other in a threadline. The first pair of godets 1.1 is formed by two godets 2.1 and 2.2. The godet 2.1 is driven by an electric motor 4.1 and the godet 2.2 by an electric motor 4.2. Both electric motors 4.1 and 4.2 are coupled to a control unit 7.1. The control unit 7.1 could for example be designed as a group converter to control both electric motors 4.1 and 4.2 with a nominal frequency.

In the in Fig. 1 illustrated embodiment, the godets 2.1 and 2.2 each have a guide sheath 3.1 and 3.2, which are formed differently in their guide diameter. The guide casing 3.1 of the godet 2.1 is designed to be heatable and larger in the guide diameter than the guide casing 3.2 of the godet 2.2. In order to be able to produce an equal guide speed on the guide sheaths 3.1 and 3.2 despite the difference in diameter, the electric motors 4.1 and 4.2 are designed with different pole pairs. That's how it is Diameter ratio of the guide sheaths 3.1 and 3.2 selected according to the pole pair ratio of the electric motors 4.1 and 4.2.

Such a godet duo is for example from the WO 2004/001106 A1 known, so that reference is made at this point to the cited document and for this no further explanation takes place.

The second galette duo 1.2 is formed by godets 2.4 and 2.5. The godet 2.4 is driven by the electric motor 4.4 and the godet 2.5 by the electric motor 4.5. The electric motors 4.4 and 4.5 are coupled to the control unit 7.3, which could also be formed by a group converter. The godet pair 1.2 is identical to the godet duo 1.1, so that the guide sheath 3.4 of the godet 2.4 is formed heatable and compared to the guide sheath 3.5 of the godet 2.5 has a larger guide diameter.

In the yarn path between the godet pair 1.1 and 1.2, a godet 2.3 is arranged, which is driven individually by an electric motor 4.3. The electric motor 4.3 is associated with the control unit 7.2, so that the guide sheath 3.3 of the godet 2.3 is individually adjustable in its guide speed. The godet 2.3 is independently of the godets 2.1 and 2.2 of the first godet godet 1.1 and independently of the godets 2.4 and 2.5 of the second godet twod 1.2 formed controllable.

In the Fig. 1 illustrated control devices 7.1, 7.2 and 7.3 are usually coupled to a control device, not shown here, which controls the removal and stretching of a thread within the melt spinning process. To illustrate the function of the embodiment according to Fig. 1 the yarn path of a thread 8 is located. Thus, the thread 8 is withdrawn by the godets 2.1 and 2.2 from a spinning device, not shown here. For this purpose, the guide sheaths 3.1 and 3.2 with a first guide speed by the electric motors 4.1 and 4.2 driven. The guide sheaths 3.1 and 3.2 are wrapped several times by the thread 8 and guided over the galette 2.3 to the second Galettenduo 1.2. The godet 2.3 is driven by drives of the guide casing 3.3 via the electric motor 4.3 at a second guide speed, which is generally higher than the first guide speeds of the godets 2.1 and 2.2. Thus, a slight pre-stretching can already be realized. Basically, however, there is also the possibility that the guide sheath 3.3 of the godet 2.3 is driven at the same high speed as the godet 2.1.

The main drawing takes place between the godet 2.3 and the godets 2.4 and 2.5 of the second godet duo 1.2. For this purpose, the guide shells 3.4 and 3.5 of the godets 2.4 and 2.5 are driven at a higher guide speed by the electric motors 4.4 and 4.5. The speed difference between the two godets 1.1 and 1.2 decides the maximum draw of the thread 8. Basically, the draw tension here can be adjusted by the interposed godet such that a deduction of the thread 8 from the spinning device by the godet 2.1 remains unaffected. As far as a high flexibility is given to in a melt spinning process a parked on the upstream and downstream treatment process drawing of the thread possible.

At the in Fig. 1 illustrated embodiment, the godets 2.1 and 2.2 of the first Galettenduos 1.1 and the godets 2.4 and 2.5 of the second Galettenduos 1.2 are executed with different leadership coats. In principle, however, there is also the possibility that the godets 2.1 and 2.2 as well as 2.4 and 2.5 of the godet duo 1.1 and 1.2 execute with identical guide shells.

In Fig. 2 a further embodiment of the device according to the invention is shown schematically. At the in Fig. 2 illustrated embodiment, a godet assembly is selected, in which a thread 8 can be guided with simple Teilumschlingung on the guide shells of the godets. For this purpose, a first pair of godets 1.1 is provided at the thread inlet. The godet pair 1.1 is formed from the two godets 2.1 and 2.2, the guide shells 3.1 and 3.2 are driven by separate electric motors. The electric motors are designed as a clockwise motor 5.1 and a left-hand drive 6.1. Thus, the godet 2.1 is driven by the clockwise motor 5.1 and the godet 2.2 by the left-hand drive motor 6.1. The right-hand drive motor 5.1 and the left-hand drive motor 6.1 are connected in common to the control unit 7.1, so that both motors 5.1 and 6.1 are controlled with a setpoint frequency. The control unit 7.1 could thus be formed by a group converter.

At the in Fig. 2 illustrated embodiment, the godet 2.1 is formed with a non-heated guide shell 3.1, which has a guide diameter which is smaller than the guide diameter of the guide shell 3.2 of the second godet 2.2. For further explanation, in addition to the FIG. 3 Referenced.

In the Fig. 3 is shown schematically a cross-sectional view of the godet dome 1.1. The godets 2.1 and 2.2 of the godet dome 1.1 are held on a machine frame 9. The godet 2.1 is held on the godet carrier 12.1 on the machine frame 9, wherein the guide sheath 3.1 of the godet 2.1 is guided cantilevered. The guide casing 3.1 is for this purpose formed as a hollow cylinder and coupled internally with a drive shaft 34.1. The drive shaft 34.1 is driven by the clockwise motor 5.1.

The second godet 2.2 is held on a separate godet carrier 12.2 on the machine frame 9. The guide casing 3.2 of the godet 2.2 is connected to a drive shaft 34.2, which is driven by the left-hand drive motor 6.1. The guide casing 3.2 is formed as a hollow cylinder and slipped with its jacket over a heater 11. The heating device 11, which may be formed by an induction coil, for example, is held on a heating carrier 10 and is electrically connected to an outer heating control device 13. By means of the heating control device 13, it is possible in each case to set a desired surface temperature on the guide casing 3.2. The sensors provided for controlling and monitoring the surface temperature are not shown in this embodiment.

The guide casing 3.2 of the godet 2.2 is made larger in the guide diameter than the guide casing 3.1 of the godet 2.1, since the godet 2.1 has no heating and the guide casing 3.1 is unheated. In order to be able to generate the same guide speeds on the guide sheaths 3.1 and 3.2, the right-hand drive motor 5.1 and the left-hand drive motor 6.1 have a different number of pole pairs in order to be controlled together with a setpoint frequency via the control device 7.1. Thus, differences in diameter between the guide sheaths 3.1 and 3.2 can be compensated for by corresponding relationships of the pole pairs of the electric motors such that each of the guide sheaths 3.1 is driven at the same high guide speed.

At the in Fig. 2 illustrated embodiment of the device according to the invention, however, can be maintained on the godets 2.1 and 2.2, a beneficial low speed difference in order to obtain an intense thread contact of the thread 8 on the circumference of the guide casing 3.2.

As seen from the presentation Fig. 2 shows, the first galette duo 1.1 is followed by a second galette duo 1.2, which consists of the godets 2.4 and 2.5 is formed. The godets 2.4 and 2.5 are identical in construction of the guide shells 3.4 and 3.5 to the godet 2.2, so that reference can be made to the aforementioned description. The guide casing of godet 2.4 is coupled with a left-hand drive motor 6.2 and the guide casing 3.5 with a clockwise motor 5.3. The left-hand drive motor 6.2 and the right-hand drive motor 5.3 are connected in common to a control unit 7.3. The control unit 7.3 can be implemented, for example, as a group converter, so that the two motors 5.2 and 6.3 drive the guide shells 3.4 and 3.5 with identical rotational frequency and opposite direction of rotation.

Between the godet duo 1.1 and 1.2 another godet 2.3 is arranged in the yarn path, which has a heated guide casing 3.3. In that regard, the structure of the godet 2.3 is essentially identical to the structure of the godet 2.2, so that at this point to the in Fig. 3 made explanations. The guide casing 3.3 of the godet 2.3 is driven by the clockwise motor 5.2. The clockwise motor 5.2 is coupled to the control unit 7.2. The control unit 7.2 could be designed, for example, as a single inverter to individually control the guide speed of the guide sheath 3.3.

At the in Fig. 2 illustrated embodiment thus sets a godet arrangement, in which the thread 8 is guided with simple Teilumschlingung in an S-run or a Z-run on the guide sheaths 3.1 to 3.5 of the godets 2.1 to 2.5. In that regard, the godets 2.1 to 2.5 are alternately driven by a clockwise or a left-hand motor. The in Fig. 2 shown rotation of the first godet 2.1 is exemplary here. In principle, the guide casing 3.1 of the godet 2.1 could be driven by a left-hand rotation motor. Accordingly, the following godets 2.2 to 2.5 are operated in opposite directions accordingly.

At the in Fig. 2 illustrated embodiment, the thread 8 is subtracted by the first pair of godets 1.1, the godet 2.1 acts as a withdrawal godet. The guide shells 3.1 and 3.2 of the godets 2.1 and 2.2 can be operated here with identical guide speed or with a slight difference in the guide speed.

For stretching, the godets 2.3 and 2.4 are driven in stages with higher guide speeds, wherein the largest speed difference between the godet 2.3 and the godet 2.4 is formed. The godets 2.4 and 2.5 are operated at identical guide speed. However, there is also the possibility that the guide shells 3.4 and 3.5 of the godets 2.4 and 2.5 in the guide diameter are different in size designed to perform a slight thread tension reduction between the godets 2.4 and 2.5 can. Thus, a relaxation of the thread 8 can be carried out within the godet dome 1.2.

In order to be able to carry out intensive shrinking treatments in a melt spinning process, this can be done in Fig. 2 illustrated embodiment still supplement another Galette 2.6. In Fig. 2 is the galette 2.6 shown in dashed lines. The galette 2.6 has a guide casing 3.6, which is connected to a left-hand drive motor 6.3. The left-hand drive motor 6.3 is coupled to a control unit 7.4. The control unit 7.4 could in this case also be formed, for example, by a single inverter. The guide casing 3.6 Galette 2.6 is designed to be heated and is driven with a relation to the upstream Galette 2.5 lower guide speed. Thus, an intensive shrinking treatment can be carried out immediately after the drawing of the thread.

In Fig. 4 an embodiment of a melt spinning plant is shown schematically, in which an embodiment of the device according to the invention is integrated. For the purpose of melt-spinning a plurality of multifilament yarns, a heated spinning beam 14 is provided which carries a plurality of spinnerets 15 on its underside. The spinning beam 14 is aligned transversely to the plane of the drawing, so that in Fig. 4 only one of the spinnerets 15 is visible. Each of the spinnerets 15 has on its underside a plurality of nozzle openings through which a polymer melt, for example, of a polyester or a polyamide is extruded into filaments 17. The spinnerets 15 are connected to a melt inlet 16. The melt inlet 16 is coupled to a melt source, not shown here, for example, to an extruder. Within the spinneret 14 further melt-leading and melting-promoting components may be arranged, which will not be discussed in detail at this point.

Below the spinneret 14, a cooling device 18 is provided, which is formed by a cooling shaft 20 and a blowing device 19. The cooling shaft 20 is arranged below the spinnerets 15 in such a way that the plurality of filaments 17 extruded through the spinnerets pass through the cooling shaft 20. Below the cooling shaft 20 a collecting yarn guide 21 is provided to guide the filaments 17 to a thread 8 together. The collecting yarn guide 21 is for this purpose arranged centrally below the spinnerets 15.

The cooling shaft 20 is followed by a chute 35, in which the threads are guided from a spinning distance to each other to a treatment distance. For this purpose, an inlet yarn guide 22 is arranged at the end of the chute.

Below the chute, the embodiment of the device according to the invention is arranged. In this case, a godet assembly is provided, which according to the embodiment Fig. 2 equivalent. In that regard, no further explanation is given at this point and taken to the above description reference.

The illustrated godet arrangement for removing the threads, for drawing the threads and for relaxing the threads thus comprises a total of six godets 2.1 to 2.6, which are controlled by a total of four control devices 7.1 to 7.4. The godets 2.1 to 2.6 are usually arranged partly in a godet box in order to obtain as intensive as possible a thermal treatment.

Below the godet assembly a preparation device 23 and a swirling device 24 is arranged, which are held between a plurality of guide godets 25.1, 25.2 and 25.3. Thus, a thread closure by dissection and swirling is produced on the threads 8 before winding into a coil. In principle, the preparation device and the swirling device can comprise a plurality of stations which are upstream and downstream of the device according to the invention.

For winding the drawn threads 8, a winding device 26 is provided, which has a rotatable spindle carrier 30 with two projecting winding spindles 29.1 and 29.2. The spindle carrier 30 is mounted on a frame 31. In this case, the winding spindles 29.1 and 29.2 can be guided alternately into an operating region for winding a coil and into a changing region for exchanging a coil. In the frame 31, a traversing device 27 and a pressure roller 28 is provided to wind the threads to a respective coil 33. Above the traversing device 27 each winding point is associated with a deflection roller 32, through which the inlet of the threads 5 is guided by the winding stations.

At the in Fig. 4 illustrated embodiment of the spinning system, the freshly extruded thread 8 is fed immediately after the melt spinning directly in the dry state of the filaments 17 of the godet assembly of the device according to the invention and stretched to a fully drawn yarn.

LIST OF REFERENCE NUMBERS

1.1, 1.2

godet duo

2.1, 2.2 ... 2.6

Galette

3.1, 3.2 ... 3.6

guide sheath

4.1, 4.2 ... 4.6

electric motor

5.1, 5.2

CW Motor

6.1, 6.2

CCW Engine

7.1, 7.2, 7.3, 7.4

control unit

8th

thread

9

machine frame

10

heating susceptor

11

heater

12.1, 12.2

Galettenträger

13

heater controller

14

spinning beam

15

spinneret

16

melt inlet

17

filaments

18

cooling device

19

blowing device

20

cooling shaft

21

Collecting yarn guides

22

Inlet yarn guide

23

preparation device

24

swirling

25.1, 25.2, 25.3

Führungsgaletten

26

takeup

27

Traversing device

28

pressure roller

29.1, 29.2

winding spindle

30

spindle carrier

31

frame

32

idler pulley

33

Kitchen sink

34.1, 34.2

drive shaft

35

chute

Claims (9)

1. Apparatus for taking off and drawing a synthetic yarn in a melt-spinning process, having a plurality of driven godets (2.1, 2.2, 2.4, 2.5), having a plurality of electric motors (4.1, 4.2, 4.4, 4.5) assigned to the godets (2.1, 2.2, 2.4, 2.5), and having a plurality of control units (7.1, 7.3) assigned to the electric motors (4.1, 4.2, 4.4, 4.5), wherein two godets (2.1, 2.2) which are arranged in succession in the yarn run and have two assigned electric motors (4.1, 4.2) are controllable jointly as a godet pair (1.1) by one of the control units (7.1, 7.3), and wherein a plurality of godet pairs (1.1, 1.2) are provided,
   characterized in that
   between the godets (2.1, 2.2, 2.4, 2.5) of the godet pairs (1.1, 1.2) is arranged a godet (2.3)to be drivable and controllable separately.
2. Apparatus according to Claim 1,
   characterized in that
   the godet (2.3) has a heated guide casing (3.3).
3. Apparatus according to Claim 1 or 2,
   characterized in that
   the electric motors are formed by a plurality of anticlockwise motors (6.1, 6.2) and clockwise motors (5.1, 5.2) and in that the successive godets (2.1, 2.2, 2.3) in the yarn run are assigned alternately one of the anticlockwise motors (6.1, 6.2) and one of the clockwise motors (5.1, 5.2).
4. Apparatus according to one of Claims 1 to 3,
   characterized in that
   the first godet (2.1) of the first godet pair (1.1) forms a take-off godet having an unheated guide casing (3.1) which is designed with a smaller guiding diameter than the guide casing (3.2) of the second godet (2.2) of the godet pair (1.1).
5. Apparatus according to Claim 4,
   characterized in that
   the electric motors (4.1, 4.2) of the two godets (2.1, 2.2) of the first godet pair (1.1) have an unequal number of pole pairs.
6. Apparatus according to Claim 4 or 5,
   characterized in that
   the second godet (2.2) of the first godet pair (1.1) has a heated guide casing (3.2).
7. Apparatus according to one of the preceding claims,
   characterized in that
   the godets (2.4, 2.5) of the second godet pair (1.2) have two heated guide casings (3.1, 3.2) which have guiding diameters of equal or unequal size.
8. Apparatus according to one of Claims 1 to 7,
   characterized in that
   a godet (2.6) is provided downstream of the godets (2.4, 2.5) of the second godet pair (1.2), said downstream godet (2.6) being drivable and controllable separately and having a heated guide casing (3.6).
9. Melt-spinning plant for producing synthetic yarns from a polymer melt, having an apparatus for taking off and drawing the yarns,
   characterized in that
   the apparatus is designed as per one of Claims 1 to 8.

Images