DE102022004931A1 - Device for cooling a plurality of synthetic filaments - Google Patents

Abstract

The invention relates to a device (500) for cooling a plurality of synthetic filaments (26), comprising a feed housing (1) for supplying an air flow (L) and a cooling shaft (7, 700) for radially supplying the air flow (L) as cooling air (K _L ) into a guide channel (14) of the cooling shaft, which is designed to cool the plurality of synthetic filaments (26) by means of the cooling air (K _L ), wherein the plurality of filaments (26) can be guided in a thread guide direction (F) in the guide channel (14), wherein the feed housing (1) is supplied with the air flow (L) in a flow direction (S) by means of an air supply (12). In the thread guide direction (F) below the cooling shaft (7, 700) a conditioning region (400) is defined which defines a secondary air channel (50, 500), wherein a uniform conditioning of the plurality of synthetic filaments (26) can be set by means of secondary air (WS) on opposite sides of the secondary air channel. The invention further relates to an associated melt spinning device.

Description

The invention relates to a device for cooling a plurality of synthetic filaments according to the preamble of claim 1 and an associated melt spinning device.

It is known from the general state of the art that in the production of synthetic threads, these are cooled after extrusion from a polymer melt to solidify them. The cooling of the filament strands is usually carried out by a cooling air flow that is directed onto the freshly extruded filament strands. The cooling air flow is preferably directed from the outside onto the filament strands extruded from a spinneret. Such a device for cooling several filament bundles extruded through spinnerets is known, for example, from EN 34 24 253A1 It describes a spinning system for chemical fibers with a blowing box and spinning shaft, whereby the fibers emerging from the spinnerets can be cooled by a turbulence-free air stream.

The disadvantage here is that deposits can form between the spinnerets and the cooling shaft, which must be removed regularly. To do this, it must be possible to lower the cooling box using a lifting device to clean the spinnerets.

A corresponding lifting device is available, for example, EN 10 2015 012 846 A1 known. According to this, a lifting device is provided below the spinning beam between the cooling unit. The lifting device has two separate lifting means that are assigned to the cooling units. The lifting means allow the cooling units to be moved back and forth independently of one another between an operating position and a maintenance position.

The problem here is that between the area in which the filaments are guided and the lifting device, there is often a wall section that prevents the drag air that is sucked in by the cooling air flow and the extruded thread from only acting on one side of the extruded filaments and thus impairing the thread quality.

The object of the invention is therefore to provide a device for cooling the filaments, with which a one-sided cooling of the filaments by drag air can be prevented.

Furthermore, it is an object of the invention to provide a melt spinning device with which the above-mentioned disadvantages can be avoided.

The object with regard to a device is achieved according to the invention with a device having the features of claim 1.

With regard to the melt spinning device, the object is achieved according to the invention with a melt spinning device having the features of claim 14.

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

According to one aspect of the invention, a device is provided for cooling a plurality of synthetic threads, comprising a feed housing for supplying an air flow and a cooling shaft for radially supplying the air flow as cooling air into a guide channel of the cooling shaft, which is designed to cool the plurality of synthetic threads by means of the cooling air, wherein the plurality of filaments can be guided in a thread guide direction in the guide channel, wherein the feed housing is supplied with the air flow by means of an air supply. In the thread guide direction, a conditioning region is defined below the cooling shaft, which defines a secondary air channel, wherein uniform conditioning of the plurality of synthetic filaments by means of secondary air can be set on opposite sides of the secondary air channel.

A conditioning area is understood here in particular to be an area below the cooling shaft by means of which the filaments can be further conditioned, in which a secondary air provided in the conditioning area can be adjusted in quality and quantity, in which, for example, its inflow can be regulated.

Secondary air is understood to mean in particular the air that entrains the filaments, which can influence the cooling of the filaments and which is entrained by the filaments.

In the conditioning area, it is ensured that this secondary air acts evenly on the filaments, so that there are no disadvantages due to a one-sided effect of the secondary air.

According to one embodiment of the device, the conditioning area has an operating side and a maintenance side, which are each positioned opposite the guide channel, so that a uniform conditioning of the plurality of synthetic threads can be set by means of the secondary air on both the operating side and the maintenance side.

An operating side is understood to be the area or section that can be accessed by an operator for servicing and applying the synthetic threads in the cooling shaft area, while the maintenance side should only be accessed irregularly so that, for example, the cooling shafts and/or the spinnerets and the corresponding feed lines can be maintained.

According to a further embodiment of the device, the air supply is positioned between a machine beam for extruding the plurality of synthetic filaments and a thread outlet opening of the cooling shaft.

This offers the advantage that the air supply is arranged in a higher position so that the maintenance side of air supply lines can be kept free, which promotes a conditioned secondary air supply so that a uniform secondary air influence on the synthetic filaments is possible.

According to a further embodiment of the device, an adjustable convergence point is positioned in the thread running direction below the cooling shaft, which is arranged in the secondary air duct.

The convergence point is used to bring the synthetic threads together to form a thread. Usually, the filament has been sufficiently cooled and solidified before the convergence point.

It is therefore important that this cooling also takes place evenly, in particular by secondary air, which is ensured according to the invention by a supply of secondary air on both sides.

According to one embodiment of the device, the secondary air channel is defined transversely to the thread running direction on both sides by a first conditioning wall and a second conditioning wall.

The conditioning wall also serves to ensure the supply of secondary air and a defined supply. The conditioning wall can be designed as a door so that it can be led to the secondary air duct as required. If necessary, the conditioning wall can also be folded away from the secondary air duct and removed.

According to a further embodiment of the device, the first and/or the second conditioning wall is designed to allow secondary air to pass through, wherein the secondary air has a proportion of thread drag air which is formed when the thread is removed and a proportion of cooling drag air which is formed by the flow of the cooling air into the thread guide channel.

The conditioning wall is designed in such a way that the secondary air can be fed into the secondary air channel in a controlled manner. This ensures that the filaments are evenly supplied with secondary air, so that it can be ensured that no one-sided, unintentional supply of secondary air occurs.

According to a further embodiment of the device, the first conditioning wall and/or the second conditioning wall are designed in sections for conditioning and/or uniformly supplying the secondary air.

Conditioning here means in particular adjusting the secondary air flow, whereby a turbulent supply of secondary air should be avoided in particular. However, if this cannot be avoided, this flow should have uniform properties on both sides of the secondary air duct.

According to a further embodiment of the device, the uniform conditioning of the plurality of synthetic filaments by means of the secondary air can be adjusted substantially symmetrically to the central axis of the cooling shaft.

This ensures that the secondary air acts symmetrically on both sides of the synthetic filaments with respect to the central axis of the cooling shaft, so that there is no uneven cooling, which can be disadvantageous during further processing of the synthetic threads, for example during dyeing.

According to a further embodiment of the device, the first and/or the second conditioning wall is positioned at a uniform distance from the central axis of the cooling shaft. This supports the symmetrical distribution and supply of the secondary air to the secondary air duct of the device.

According to a further embodiment of the device, the first and/or the second conditioning wall has a perforation and/or a grid structure at least in sections for the conditioned supply of secondary air. With corresponding openings in the conditioning wall, a controlled predetermined supply of secondary air is possible, whereby a uniform and symmetrically conditioned secondary air supply can be supplied.

In a further embodiment of the device, the feed housing at least partially surrounds the cooling shaft and/or the cooling shaft at least partially surrounds the feed housing. These two embodiments describe arrangements of the feed housing of the air flow into the cooling shaft, wherein the cooling shaft either concentrically surrounds the thread guide channel and the cooling air is supplied via the cooling shaft, in which the filaments are also guided, or another embodiment, wherein the cooling shaft is supplied with air via a feed housing, which is a blower candle that extends into the cooling shaft, but in which no threads or filaments are guided.

According to a further embodiment of the device, the air supply is positioned in the plane of the feed housing. This offers the advantage that a two-sided and also uniform, preferably symmetrical, conditioning of the filaments via the secondary air is possible, since the air supply is not arranged in the area in which the secondary air can act on the filaments.

According to a further embodiment of the device, the flow direction of the air flow direction defined by the air supply runs, at least in sections, essentially in the same direction as the direction of the thread guide direction.

This offers the advantage that the air supply can be arranged in an area that does not affect the secondary air supply.

According to another aspect of the invention, a melt spinning device for melt spinning and cooling a plurality of threads is provided, comprising a spinning beam having a plurality of spinning packages on an underside, and comprising a device for cooling a plurality of synthetic threads held on an underside of the spinning beam, wherein the device for cooling a plurality of synthetic threads is designed according to at least one of the above-mentioned embodiments.

A melt spinning apparatus provided and equipped with the apparatus according to the invention for cooling a plurality of synthetic threads has the advantage that a good filament quality can be produced since the negative effects of an uneven secondary air effect can be eliminated or avoided.

The invention is explained in more detail below using some embodiments of the device according to the invention with reference to the accompanying figures.

• 1 schematisch eine Querschnittsansicht einer Vorrichtung zum Abkühlen einer Mehrzahl von synthetischen Filamenten gemäß dem Stand der Technik,
• 2 eine Querschnittsansicht einer ersten Ausführungsform der Erfindung einer Vorrichtung zum Abkühlen einer Mehrzahl von synthetischen Filamenten,
• 3 eine Draufsicht einer ersten Ausführungsform eines Kühlschachtes gemäß Schnittführung A-A aus 2,
• 4 eine schematische Queransicht eines zweiten Ausführungsbeispiels der Erfindung,
• 5 eine Draufsicht eines Kühlschachtes gemäß Schnittführung B-B aus 4, und
• 6 und 7 Ausführungsbeispiele einer Konditionierungswand.

They represent:

• 1 schematically a cross-sectional view of a device for cooling a plurality of synthetic filaments according to the prior art,
• 2 a cross-sectional view of a first embodiment of the invention of a device for cooling a plurality of synthetic filaments,
• 3 a plan view of a first embodiment of a cooling shaft according to section AA of 2 ,
• 4 a schematic transverse view of a second embodiment of the invention,
• 5 a top view of a cooling shaft according to section BB from 4 , and
• 6 and 7 Examples of a conditioning wall.

In the 1 to 7 a reference coordinate system with XYZ direction is specified, which indicates the X-longitudinal direction, the Y-longitudinal direction and the Z-direction of a device for cooling a plurality of synthetic threads, or their associated components, so that their view in relation to one another can be better understood.

In 1 a device for cooling a plurality of synthetic threads is shown, according to the prior art.

The device for cooling a plurality of synthetic threads is arranged on a spinning beam 20 in which at least one spinning pack 21 is arranged. In the longitudinal direction X, several spinning packs 21 are arranged in series so that a plurality of synthetic threads can be produced, each of which is formed from a plurality of filaments 26 via a spinning pack 21.

In the following, the cross-sectional view is explained with reference to a spinning position, since each spinning position is preferably designed identically.

According to the invention, several spinning packages 21 can also be provided in the spinning beam, which are equipped with the corresponding device according to the invention.

A feed housing 1 is arranged on the spinning beam 20, which supplies a cooling shaft 7 in which the plurality of filaments 26 are guided.

Cooling air KL is supplied via the feed housing and an air supply connected to it, which is directed upwards. In this context, upwards is to be understood as meaning that the air flow direction L runs in the opposite upward direction compared to the thread flow direction F.

The cooling shaft 7 has a thread inlet opening 2 into which the plurality of filaments 26 are fed to the cooling shaft 7. The cooling air KL is fed to the cooling shaft 7 via the feed housing via a passage wall 10. The feed housing 1 has an upper part 5 and a lower part 4, wherein the lower part 4 is connected to the air feed 12, which surrounds the cooling shaft 7 in a ring shape or concentrically, so that the cooling air KL fed therein can be fed radially via the passage wall 10.

The synthetic filaments 26 to be cooled leave the cooling shaft 7 via a thread outlet opening 15. A convergence point 31 is positioned below the thread outlet opening 15.

As from 1 As can be seen, the majority of filaments 26 run on the one hand up to the convergence point 31 through a section below the cooling shaft 7, which is delimited on the one hand by the air supply 12 and a lifting device 29 which can guide a carrier 28 back and forth so that the cooling shaft 7 can be moved back and forth between an operating position and a maintenance position.

Furthermore, a rear wall guide 30 is arranged between the lifting device 29, which can be coupled to the carrier 28 so that the convergence point 31 can be changed in position, so that the position of the convergence point 31 can be changed depending on the thread to be produced.

Due to the one-sided blockage by the air supply 12, the rear wall guide 30 and the lifting cylinder 29 of the lifting device, secondary air WS can only act on the thread on one side. This can, for example, have a negative effect on the dyeing behavior of the thread made up of the plurality of filaments 26.

According to the invention, a cooling device is therefore provided which has a device 500 for cooling a plurality of filaments 26, which has a conditioning region 400 which allows a symmetrical supply of secondary air WS on both sides of the thread running direction of the synthetic filaments 26.

In 2 a first embodiment of the device 500 is shown. The device 500 according to the invention also has a spinning beam 20 in which a spinning package 21 for producing a plurality of filaments 26 is provided.

A cooling shaft 7 with a feed housing 1 is arranged adjacent to the spinning beam 20. The feed housing 1 has an upper and lower part 5, 4. Cooling air KL is supplied in the air flow direction L via the lower part 4.

In this embodiment, a downward-directed air supply 120 is provided so that the area below the air supply 120 can be kept clear so that entraining air WS can also be supplied to the conditioning area 400 without disruption on the side of the air supply 120.

The conditioning region 400 has a first conditioning wall 40 and a second conditioning wall 41 which surround the convergence point 31 so that the drag air WS can act on both sides of the convergence point 31.

For this purpose, the conditioning walls 41, 42 are arranged at an equal distance b1, b2 from the central axis MZ of the cooling shaft 7, which promotes a uniform supply of the secondary air WS.

In 3 is according to section AA from 2 the cooling shaft 7 is shown, which is surrounded by the supply housing which is supplied with air supply downwards 120.

In this context, downwards means that the air guide L runs at least partially in the downwardly directed air supply 120 in the direction of the thread running direction F, as is particularly the case in 2 is recognizable.

4 shows a further example of the embodiment of a device for cooling synthetic filaments, in which case the synthetic filaments are used in particular for the production of staple fibers. The spinning beam 200 has a spinning pack 210 with capillaries which are arranged in a circular section in the spinning pack 210, so that an annular thread curtain can be extruded from the plurality of filaments 26.

With this type of filament, the cooling shaft 700 has a blowing candle that projects into the thread guide channel 14. Here, too, there is a conditioning area 400 below the cooling shaft 700, which has a first and second conditioning wall 400, 410 that are arranged at the same distance b10, b20 and essentially symmetrically to one another. The air supply 120 is also arranged above the conditioning area 400. arranged so that there is no impairment of the drag air WS.

In 5 is according to cutting guide BB from 4 the cooling shaft 700 is shown, which is surrounded by the supply housing 100, which is supplied with a downwardly directed air supply 120.

As shown in Figures 3 and 5, the feed housing 1 can at least partially surround the cooling shaft 7 or the cooling shaft 700 can at least partially surround the feed housing 1. This depends on which type of thread is to be produced and which radial cooling from the outside to the inside or from the inside to the outside is provided.

As further stated 2 and 4 As can be seen, the conditioning area 400 is defined by an operating side B for operating and applying filaments and a maintenance side R for servicing devices on the maintenance side R, which are each positioned opposite the guide channel 14,140, so that a uniform conditioning of the plurality of synthetic filaments 26 can be set by means of the secondary air WS on both the operating side B and the maintenance side R.

The secondary air channel 50, 505 is defined transversely to the thread running direction F on both sides by a first conditioning wall 40, 400 and a second conditioning wall 41, 410.

Preferably, the first and/or the second conditioning wall 40, 400 are positioned at the same distance b1, b2 from the center axis M _z of the cooling shaft 7. Furthermore, the first and the second conditioning wall 40, 400 are designed to be identical to one another, so that the most uniform and symmetrical supply of secondary air WS can take place in the secondary air duct 50, 505.

The first conditioning wall 40, 400 and/or the second conditioning wall 41, 410 are designed to allow the secondary air WS to pass through. The first conditioning wall 40, 400 and/or the second conditioning wall 41, 410 can also be designed to be pivotable, so that the first conditioning wall 40, 400 and/or the second conditioning wall 41, 410 can be pivoted away like a door.

The secondary air WS has a portion of thread drag air WF, which is formed when the thread is removed, and a portion of cooling drag air, which is formed by the flow of the cooling air KL in the thread guide channel 14, 140. The entrained secondary air also contributes to the cooling and solidification of the filaments.

As further in. 2 to 5 shown schematically, the downwardly directed air supply 120 can have a plurality of collective air supply sections 17, which allow a targeted air supply L into the associated supply housing 1, 100.

Preferably, each supply housing 100 has a single collective air supply section 17, which has its own hose coupling 18. In the embodiment shown, each hose coupling 18 is assigned a plurality of collective air supply sections 17. However, embodiments are also possible in which only one collective air supply section 17 or several collective air supply sections 17 are provided for each hose coupling 18.

The 6 and 7 show embodiments of the conditioning wall 40, 41 and 400, 410 respectively. For example, the conditioning walls can have perforations and/or a grid structure with which the secondary air can be better controlled and supplied.

List of reference symbols

1

Feed housing

2

Thread inlet opening

3

Connection channel

4

Bottom part

5

Top

6

Air connection

7

Cooling shaft

700

Cooling shaft

8th

Perforated plate

9

Thread passage

10

Passage wall

100

Passage wall

11

Side wall

12

Air supply upwards

14

Thread guide channel

120

Air supply downwards

17

Collective air supply section

18

Hose coupling

140

Thread guide channel

15

Thread outlet opening

20

Spinning beam

200

Spinning beam

21

Spin package

210

Spin package

26

Filament

28

carrier

29

Lifting cylinder

30

Rear wall guide

31

Convergence point

40, 400

first conditioning wall

41, 410

second conditioning wall

404

Conditioning area

500

Cooling device

50,505

Secondary air duct

Ws

Secondary air

WF

Thread drag air

WL

Cooling drag air

X

Conditioned secondary air

F

Thread direction

L

Airflow direction

K1

Cooling air

S

Airflow

Mz

Central axis

B

Operating page

R

Maintenance page

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions.

Cited patent literature

• DE 3424253 A1 [0002]
• DE 102015012846 A1 [0004]

Claims (14)

Device (500) for cooling a plurality of synthetic filaments (26), comprising a feed housing (1) for feeding an air flow (L) and a cooling shaft (7, 700) for radially feeding the air flow (L) as cooling air (K _L ) into a guide channel (14) of the cooling shaft, which is designed to cool the plurality of synthetic filaments (26) by means of the cooling air (K _L ), wherein the plurality of filaments (26) can be guided in a thread guide direction (F) in the guide channel (14), wherein the feed housing (1) is supplied with the air flow (L) by means of an air supply (12), characterized in that in the thread guide direction (F) below the cooling shaft (7, 700) a conditioning region (404) is defined which defines a secondary air channel (50, 500), wherein on opposite sides of the Secondary air channel enables uniform conditioning of the plurality of synthetic filaments (26) by means of secondary air (WS). Device according to Claim 1 , characterized in that the conditioning area (404) has an operating side (B) and a maintenance side (R), which are each positioned opposite the guide channel (14), so that a uniform conditioning of the plurality of synthetic filaments (26) can be set by means of the secondary air (WS) both on the operating side (B) and on the maintenance side (R). Device according to at least one of the preceding Claims 1 or 2 , characterized in that the air supply (12) is positioned between a spinning beam (20, 200) for extruding the plurality of synthetic filaments (26) and a thread outlet opening (15, 150) of the cooling shaft (7, 700). Device according to at least one of the preceding claims, characterized in that an adjustable convergence point (31) is positioned in the thread running direction (F) below the cooling shaft (7, 700), which is arranged in the secondary air channel (50, 505). Device according to at least one of the preceding claims, characterized in that the secondary air channel (50, 505) is defined transversely to the thread running direction (F) on both sides by a first conditioning wall (40, 400) and a second conditioning wall (41, 410). Device according to at least one of the preceding claims, characterized in that the first and/or the second conditioning wall (40, 41, 400, 410) are designed to allow secondary air (WS) to pass through, the secondary air having a proportion of thread drag air (WF) which is formed when the thread is removed, and a proportion of cooling drag air which is formed by the flow of the cooling air (KL) in the thread guide channel (14, 140). Device according to at least one of the preceding claims, characterized in that the first conditioning wall (40, 400) and/or the second conditioning wall (41, 410) are designed in sections for the conditioned and/or uniform supply of the secondary air (WS). Device according to at least one of the preceding claims, characterized in that the uniform conditioning of the plurality of synthetic filaments (26) by means of the secondary air (WS) can be adjusted substantially symmetrically to the central axis (M _z ) of the cooling shaft (7). Device according to at least one of the preceding claims, characterized in that the first and/or the second conditioning wall (40, 400) are positioned at an equal distance (b1, b2) from the central axis (M _z ) of the cooling shaft (7). Device according to at least one of the preceding claims, characterized in that the first and/or the second conditioning wall (40, 41, 400, 410) has at least in sections a perforation and/or a grid structure for the conditioned supply of the secondary air. Device according to at least one of the preceding claims, characterized in that the feed housing (1) at least partially surrounds the cooling shaft (7) and/or the cooling shaft (700) at least partially surrounds the feed housing (1). Device according to at least one of the preceding claims, characterized in that the air supply (12) is positioned in the plane of the supply housing (1). Device according to at least one of the preceding claims, characterized in that the flow direction (S) of the air flow direction (F) defined by the air supply (12) runs at least in sections substantially in the same direction as the direction of the thread guide direction (F). Melt spinning device for melt spinning and cooling a plurality of threads, comprising a spinning beam (20, 200) which is attached to a base side has a plurality of spinning packages (21, 210), and with a device (500) for cooling a plurality of synthetic filaments (1), which is held on the underside of the spinning beam, characterized in that the device (500) according to one of the Claims 1 until 13 is trained.

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