EP1288349B1 - Apparatus for melt spinning and cooling of bundles of filaments - Google Patents

Description

The invention relates to a device for melt spinning and cooling a filament bundle according to the preamble of claim 1.

In melt spinning of synthetic filaments, a plurality of stranded filaments is extruded from a polymer melt by means of a spinneret having a plurality of nozzle bores. In this case, the filament strands emerging from the spinnerets must be cooled in order to be taken up as threads or filament bundles after further treatment. In this case, air is preferably used as the cooling medium, which flows transversely to the thread running direction and is directed to the filaments. The cooling air can penetrate the filament bundle from outside to inside or from inside to outside. The invention is based on the known devices, in which the cooling air flow penetrates a filament bundle from the inside to the outside, such as from DE 36 29 731 A1 is known.

In the known device, the filament bundle is produced by an annular spinneret of a spinning device. Below the spinning device, a cooling device is provided, which has a substantially centrally aligned to the spinneret blow candle. The blow candle is connected to a holding device, through which a cooling medium is introduced into the blow candle in the interior of the blow candle. The blow candle has a porous shell, which consists for example of a sintered material, so that the cooling air flowing in the interior of the blow candle radially emerges from the blow candle and penetrates the filament bundle. In such devices, the blow candle can be adjusted between an operating position and a waiting position to allow piecing of the filament bundle at the beginning of the process. In the waiting position, the blow candle is at the distance to the spinneret completely led out of the spinning area, so that in particular longer downtime during a process interruption are inevitable. To bring the blow candle after piecing in the operating position To be able to produce at the free end of the blow candle a radial sharp air jet through an additionally formed at the end of the blow candle annular gap. In this case occurs in particular when swiveling the blow candle, the problem that the blown away from the blow candle filament strands stick together. Furthermore, it is disadvantageous that an additional air flow must be performed to the annular gap by additional guide means within the blow candle, which is turned off by additional means upon reaching the operating position again.

It is an object of the invention to provide a device of the type mentioned above with a flexible cooling device, which allows a quick adjustment of the blow candle in the operating position without additional air supply after piecing.

This object is achieved by the device defined in claim 1.

The invention is characterized in that the radially outgoing through the blow candle cooling air flow can be used to keep the filaments during startup of the blow candle in the operating position of the blow candle. In this case, the intensity of the air flow occurring at the blowing end of the guide tube can be adjusted by the degree of overlap between the guide tube and the blow candle. In the event that the guide tube extends over the entire length of the blow candle, a substantially axially directed air flow is generated at the end of the blow candle by the guide tube. The air flow is directed against the spinning device, so that the path for adjusting the blow candle is kept free. Since the blow candle and the guide tube in the axial direction can be displaced relative to each other, the overlap between the guide tube and the blow candle can be canceled in the operating position, so that the radial flow of cooling air generated by the blow candle can unhindered emerge for cooling the filament strands.

By a particularly advantageous development of the invention according to claim 2, the overlap between the guide tube and the blow candle can be adjusted solely by the movement of the blow candle. For this purpose, the guide tube is attached to the holding device. Within the guide tube, the blow candle can be moved axially relative to the holding device and relative to the guide tube between the operating position and the waiting position. The coverage required to generate the air flow is thus greatest in the waiting position of the blow candle and is reduced with adjustment of the blow candle in the direction of the operating position. This development has the particular advantage that with decrease of the overlap between the blow candle and the guide tube emerging from the blowing end of the guide tube air flow connects to the outside of the guide tube radially emerging air flow of the blow candle to a total air flow, so that a widening of the filament curtain by the Total air flow is generated.

The advantageous development of the invention according to claim 3 provides a particularly flexible cooling device, in which the degree of overlap on the blow candle is independent of the position of the blow candle changeable. For this purpose, the guide tube is formed axially movable on the holding device.

In order to obtain a possible widening of the annular filament curtain after piecing, it is proposed according to a preferred embodiment of the invention to provide the blow candle at the free end with a spigot, which has a peripheral collar projecting the diameter of the blow candle. Thus, the air flow flowing parallel to the blow candle from the blowing end of the guide tube is deflected in the radial direction. There is also the ability to form the collar of the spigot so that an annular air gap is made between the bladder and the collar.

In order to obtain the most intense axially directed air flow at the blowing end of the guide tube, the blow candle is connected at the end facing the holding device with a connecting piece, which is sealingly guided in the guide tube according to an advantageous development.

In order to reinforce the air flow emerging at the blowing end of the guide tube, the device according to the invention is advantageously designed according to claims 6 and 7. In this case, an additional air flow from the pressure chamber passes through a plurality of shell openings of the guide tube in the guide tube and is guided between the blow candle and the guide tube to the bubble end.

In a particularly advantageous embodiment of the invention, the blow candle can be adjusted relative to the holding device between the operating position and the waiting position by an actuator axially. In the operating position, the blow candle is held by the actuator on the spinning device. This ensures that the blow candle is safely guided and held after each change in the operating position.

The actuator could be formed by electrical, pneumatic or hydraulic means.

In order to change the blow candle directly from the positioned below the spinning device cooling device, the blow candle according to an advantageous embodiment of the invention is releasably connected to the holding device. Thus, in the waiting position, the blow candle is removed from the holding device and after cleaning or after replacement again on the holding device assembled. The holding device with the supply lines for the cooling medium can be advantageously held stationary.

The holding device of the cooling device is preferably used for receiving a preparation device, which is mounted below the blow candle on the holding device. The preparation device has a preparation ring, which is contacted by the film set and applies a spin finish to the filaments.

On the one hand to obtain a uniform wetting and distribution of the preparation agent on the surface of the preparation ring and on the other hand to ensure a low-wear safe thread guide, the preparation ring is preferably formed from a plurality of ceramic discs.

The development of the invention according to claim 13 is particularly advantageous to lead the cooling device completely out of the spinning line.

Some embodiments of the device according to the invention are described in more detail with reference to the accompanying drawings.

Fig. 1

schematisch ein erstes Ausführungsbeispiel der erfindungsgemäßen Vorrichtung;

Fig. 2

schematisch ein weiteres Ausführungsbeispiel der erfindungsgemäßen Vorrichtung

It represents.

Fig. 1

schematically a first embodiment of the device according to the invention;

Fig. 2

schematically a further embodiment of the device according to the invention

In Fig. 1 is schematically illustrated a first embodiment of the device according to the invention. This shows Fig. 1.1 the device in operation and Fig. 1.2 the device out of service. Unless an explicit reference is made to one of the figures, the following description applies to both figures.

The device consists of a spinning device 1 and a cooling device 2 arranged below the spinning device 1. The spinning device 1 has on an underside an annular spinneret 4, which is connected via a melt distributor 5 with a spinning pump 6. The spinning pump 6 is connected via a melt line 7 with a melt generator (not shown here).

The cooling device 2 below the spinning device 1 has a holding device 10 and a blow candle 9 connected to the holding device 10. The blow candle 9 has a porous shell, which may be made for example of a nonwoven, foam, mesh or a sintered material. At the free end of the blow candle 9 is closed by a spigot 11. With the opposite end of the blow candle 9 is guided in a guide tube 13 through a connecting piece 12. The connecting piece 12 and the blow candle 9 are connected to each other via a detachable conical seat 16.
The guide tube 13 is mounted concentrically to the blow candle 9 on the holding device 10, wherein the inner diameter of the guide tube 13 is greater than the outer diameter of the blow candle 9. The guide tube 13 protrudes with one end out of the holding device 10. This end of the guide tube 13 is referred to as bubble end by the reference numeral 15. With the opposite end of the guide tube 13 projects into a formed in the interior of the holding device 10 pressure chamber 17th

The cylindrical fitting 12 is slidably stirred within the guide tube 13. In the guide part of the connecting piece 12, a seal 22 is provided on the circumference with respect to the wall of the guide tube 13. The connecting piece 12 is formed as a hollow cylinder and the open end of the guide tube 13 with the pressure chamber 17 within the holding device 10th connected. The pressure chamber 17 within the holding device 10 is connected via an inlet 21 to a pressure source.

The connecting piece 12 is connected through the open end of the guide tube 13 with an actuator 25, which is preferably designed as a piston-cylinder unit and is held within the pressure chamber 17 on the holding device 10. By the actuator 25, the Blaskerze 9 can move between an operating position and a waiting position and vice versa.

At the periphery of the holding device 10, a preparation device 18 is provided which has a preparation ring 19 introduced on the holding device 10. The preparation ring 19 is supplied from the inside with a preparation liquid, which is supplied via a line 20.

In Fig. 1.1 the device is shown in operation. For this purpose, the blow candle 9 is held by actuator 25 in an operating position. In this case, the spigot 11 of the Blaskerze 9 abuts against a stop 8 of the spinning device 1. The stop 8 is arranged on the underside of the spinning device 1 substantially centrally to the spinneret 4.

In the operating position, a cooling medium, preferably a cooling air, is supplied via the inlet 21 and a pressure chamber 17 formed inside the holding device 10. About the pressure chamber 17, the cooling medium is passed through open end of the guide tube 13 and the hollow cylindrical fitting 12 into the interior of the blow candle 9. Now, the cooling medium occurs uniformly over the jacket of the blow candle 9 to the outside and penetrates a filament 3 produced by the spinneret 4 from the inside to the outside. After the filaments of the filament bundle 3 are cooled, a preparation takes place in the preparation device 18. For this purpose, a preparation medium is conducted via the line 20 to the preparation ring 19. The preparation ring 19 could for example be made of a porous material, so that the spin finish evenly in the preparation ring 19 distributed and emerges on the surface for the preparation of the filaments. After preparation, the filament bundle is ready for further treatment. For example, the filament bundle could be made into threads and wound up or brought together in a bundle of filaments and placed in a jug.

In Fig. 1.2 the device according to the invention is shown out of service. The Blaskerze 9 of the cooling device 2 is in a waiting position with distance to the spinneret 4. Here, the Blaskerze 9 is moved with the connector 12 within the guide tube 13 by the actuator 25 axially in the thread running direction, so that the centering lug 11 of the Blaskerze 9 of the stop 8 of the spinning device 1 triggers. The blow candle 9 dips into the guide tube 13, so that at least a portion of the blow candle 9 is surrounded by the guide tube 13 shell-shaped.

In the waiting position, the blow candle 9 can be solved in a simple manner from the conical seat 16, for example, to be replaced by a new blow candle. This replacement can be advantageously carried out only by an operator, so that the production interruption is minimized due to the Blaskerzenwechsels. At the same time, it is possible to clean the underside of the spinneret 4 when the blow candle 9 is removed. The holding device 10 of the cooling device 2 can be held stationary during this procedure. However, it is also possible that the holding device 10 is formed relative to the spinning device 1 height adjustable and / or pivotable. The height adjustment of the holding device 10 is particularly advantageous for adjusting the preparation position during operation of the device.

Only when a possible process disturbance is eliminated, the process can be continued by piecing. In order to reset the blow candle 9 from the waiting position to the operating position, a cooling air flow is supplied to the blow candle 9 via the pressure chamber 17. In the area covered by the guide tube 13 the Blaskerze 9 of the radially emerging from the jacket of the Blaskerze 9 air flow is received by the guide tube 13 and blown through the open end of the bladder 15 of the guide tube 13 as a substantially axially directed air flow. The air stream flowing parallel to the blow candle 9 is directed against the spinning device 1, so that an entry of filament strands into the movement path of the blow candle 9 is avoided. In addition, the radial air flow of the blow candle 9 generated outside the guide tube 13 acts on the filament curtain, so that contact between the blow candle 9 and the filament strands is excluded.

In order to increase the air flow emerging at the blowing end 15, the guide tube 13 in the region of the pressure chamber 17 at the periphery one or more shell openings 14 through which the pressure chamber 17 is directly connected to the interior of the guide tube 13 and passes directly to the blast end 15. In the Fig. 1.1 and 1.2 the shell openings 14 are shown in dashed lines.

The connection between the blowing end 15 and the pressure chamber 17 is given only in the waiting position of the blow candle 9. In this position, the fitting 12 is located with the seal 22 directly at the open end of the guide tube 13 below the shell opening 14. Only after the blow candle 9 is brought into the operating position, the connection between the pressure chamber 17 and the blowing end 15 by the at the periphery the connector 12 provided seal 22 pressure-tight manner.

In Fig. 2 is shown a further embodiment of a device according to the invention. The embodiment according to Fig. 2 is substantially identical to the previous embodiment, so that only the essential differences are listed below. The components with the same functions have been given identical reference numerals.

This in Fig. 2 illustrated embodiment is shown out of service, wherein the Blaskerze 9 is held in the holding position on the holding device 10. The blow candle 9 is slidably guided via the connecting piece 12 in the guide tube 13, wherein the movement of the blow candle 9 is controlled by the actuator 25. The guide tube 13 is arranged displaceably in the axial direction in the holding device 10. For this purpose, the guide tube 13 has at the blowing end 15 one or more radially projecting webs 24, to which one or more actuators 27 attack. The actuator 27 is attached to the holding device 10. Between the circumference of the guide tube 13 and the holding device 10, a seal 28 is provided, through which the pressure chamber 17 is sealed to the outside.

The blow candle 9 held in the guide tube 13 has a centering lug 11 at the free end. The centering lug 11 has a circumferential collar 26 whose outer diameter is greater than the outer diameter of the blow candle 9.

After piecing the blow candle 9 is supplied via the pressure chamber 17, a cooling air. By in the covered by the guide tube 13 areas of the Blaskerze 9 of radially outflowing air flow of the Blaskerze 9 is deflected by the guide tube 13 and guided to the blast end 15. The air flow emerging from the blowing end 15 flows substantially parallel to the blow candle 9 and is deflected by the collar 26 at the free end of the blow candle 9 in the radial direction, so that an expansion of the filament curtain occurs.

In order to allow a partial air flow in the axial direction, the collar 26 of the spigot 11 may have a plurality of openings, so that a part of the air flow emerging from the blowing end 15 of the guide tube 13 flows axially against the spinning device.

In order to change the degree of overlap between the guide tube 13 and the blow candle 9 already in the waiting position, the guide tube 13 can be adjusted by the actuator 27 toward the free end of the blow candle 9 out. In order to the degree of overlap is increased, so that a stronger air flow at the blast end 15 can be generated.

In addition, between the blast end 15 of the guide tube 13 and the collar 26, a circumferential gap may be formed, through which a radially directed air flow can be generated.

After the blow candle 9 has reached the operating position below the spinning device 1, the guide tube 13 is set back by the actuator 27 in a lower position, so that no overlap between the guide tube 13 and the blow candle 1 is present. The blow candle 9 is thereby moved axially via the connecting piece 12 and the actuator 25 within the guide tube 13.

The in the FIGS. 1 and 2 illustrated embodiments are exemplary in structure and in nature. The invention extends not only to the embodiments shown here but includes any known to those skilled cooling device in which a relative movement between the blow candle and the holding device is executable to adjust the blow candle between an operating position and a waiting position.

LIST OF REFERENCE NUMBERS

1

spinner

2

cooling device

3

filament bundle

4

spinneret

5

Melt distributor

6

spinning pump

7

melt line

8th

attack

9

blow candle

10

holder

11

Spigot

12

connector

13

guide tube

14

shell opening

15

blowing

16

conical seat

17

pressure chamber

18

preparation device

19

finishing ring

20

management

21

Intake

22

poetry

24

web

25

actuator

26

collar

27

actuator

28

poetry

Claims (13)

1. Device for melt spinning and cooling a bundle of filaments (3) by a spinning device (1) having an annular spinneret (4) for extruding the bundle of filaments (3), and with a cooling device (2) arranged below the spinning device (1), the cooling device (2) having a holding device (10) and a coolant dispersing means (9), which is connected to the holding device (10) and which generates a radial cooling air flow, wherein in an operating position the coolant dispersing means (9) is held substantially centered to the spinneret (4) with contact to the spinning device (1) and wherein the coolant dispersing means (9) can be guided in a standby position below the spinneret (4), characterized in that a guide tube (13) is provided surrounding the coolant dispersing means (9) like an envelope at a distance, in that the guide tube (13) is open at the end facing the spinning device (1) (blowing end 15) and in that the guide tube (13) and the coolant dispersing means (9) can be displaced relative to one another to generate at the blowing end (15) of the guide tube an axial air stream directed against the spinning device (1), the intensity of which can be adjusted by the degree of covering between the guide tube (13) and the coolant dispersing means (9).
2. Device according to claim 1, characterized in that the guide tube (13) is mounted to the holding device (10) and in that the coolant dispersing means (9) can be moved axially relative to the holding device (10) between the operating position and the standby position, wherein in the operating position there is no overlapping between the guide tube (13) and the coolant dispersing means (9).
3. Device according to claim 1 or 2, characterized in that the guide tube (13) is configured so that it is axially movable on the holding device (10), to modify the degree of overlapping on the coolant dispersing means (9).
4. Device according to anyone of claims 1 to 3, characterized in that the coolant dispersing means (9) has a centering shoulder (11) on its free end with a circumferential collar (26) protruding over the coolant dispersing means (9).
5. Device according to anyone of claims 1 to 4, characterized in that at the end facing the holding device (10) the coolant dispersing means (9) has a connecting piece (12) and in that the connecting piece (12) is guided sealingly in the guiding tube (13).
6. Device according to claim 5, characterized in that the end of the guiding tube (13) that is opposite to the blowing end (15) is connected to a pressure chamber (17).
7. Device according to claim 6, characterized in that a plurality of envelope openings (14) is provided on the circumference of the guiding tube (13), envelope openings, by which the blowing end (15) of the guiding tube (13) is connected to the pressure chamber (17).
8. Device according to claim 7, characterized in that in the operating position of the coolant dispersing means (9) the connection between the envelope openings (14) and the blowing end (15) of the guide tube (13) is interrupted by the connecting piece (12).
9. Device according to anyone of claims 1 to 8, characterized in that the holding device (10) comprises a controllable actuator (25) by which the coolant dispersing means (9) can be adjusted axially between the operating position and the standby position relative to the holding device (10) and is maintained clamped in the operating position between the holding device (10) and the spinning device (1).
10. Device according to claim 9, characterized in that the coolant dispersing means (9) and the holding device (10) are detachably connected to one another, so that the coolant dispersing means (9) can be replaced in the standby position.
11. Device according to one of the preceding claims, characterized in that below the coolant dispersing means (9) the holding device (10) carries a finishing device (18), which has a finishing ring (19) that is contacted by the bundle of filaments (3).
12. Device according to claim 11, characterized in that the finishing ring (19) is formed by a plurality of ceramic disks (23).
13. Device according to anyone of the claims 1 to 12, characterized in that the holding device (10) is pivot able relative to the spinning device (1).

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