EP1646737A1

EP1646737A1 - Apparatus for melt spinning, cooling, and winding

Info

Publication number: EP1646737A1
Application number: EP04740775A
Authority: EP
Inventors: Jörg Hegenbarth; Hansjörg MEISE
Original assignee: Saurer GmbH and Co KG
Current assignee: Oerlikon Textile GmbH and Co KG
Priority date: 2003-07-18
Filing date: 2004-07-08
Publication date: 2006-04-19
Also published as: DE10332645A1; JP2006528283A; WO2005014900A1; TW200508433A; CN1823185A

Abstract

The invention relates to an apparatus for melt spinning, cooling, and winding up a thread formed by a plurality of filament strands, said apparatus comprising a spinning device, a cooling device, and a winding device. The spinning device is provided with a spinneret for extruding an annular filament bundle encompassing a plurality of filament strands. The cooling device is disposed below the spinning device to cool the filament strands, said cooling device comprising a blowing tube in which a stream of cooling air that flows from the inside towards the outside is generated starting from a porous blow jacket. In order to obtain a steady laminar stream for cooling the fine filament strands, the inventive blow jacket is surrounded by an additional jacket that is made of a material having a plurality of openings, resulting in the stream of cooling air being oriented without creating substantial flow resistance.

Description

Device for melt spinning, cooling and winding

The invention relates to a device for melt spinning, cooling and winding a thread formed from a filament sheet according to the preamble of claim 1 and a device for cooling a filament sheet according to the preamble of claim 14.

In the melt spinning of synthetic threads, the cooling of the extruded filament strands is of particular importance for the later quality of the synthetic thread formed from the filament strands. Particularly in the production of textile threads, very fine filament strands are extruded, which react very sensitively to cooling by a flow of cooling air and therefore require particularly uniform cooling. A basic distinction is made between two cooling processes for cooling melt-spun filament strands. In a first variant, a cooling air flow is directed from the outside onto a filament bundle. In systems of this type, particular care must be taken to ensure that the filament strands routed inside are adequately cooled.

In a second variant, the filament strands are spun in an annular arrangement and in the center of the annular filaments a cooling air flow directed from the inside out is generated. The invention is based on this principle. So-called blow candles are used to generate the cooling air flow penetrating the filament curtain from the inside, as is known, for example, from DE 196 53 451 AI. The blow candle is cylindrical and has a porous gas-permeable blow jacket. The blow candle is closed at one end and connected at an opposite end to an air outlet through which cooling air is introduced into the interior of the blow candle. A cooling air exiting over the entire blow jacket, preferably with a predetermined one To obtain a blow profile, the blow jacket consists of a porous material with a certain flow resistance. It is known to manufacture the blow jacket of the blow candle from sintered metal, metal foam, foam or wound paper layers. As a result of the pores and openings contained irregularly in the materials, a flow which is often not sufficiently laminar and is not uniform over the entire surface is generated when the cooling air exits the blow jacket. Such flow profiles, however, lead to irregularities in the cooling of fine filament strands, which also negatively affect the smooth running of the filament strands. In addition, conventional blow candles have a blow jacket with low permeability and therefore require high pressure differences in order to obtain an outflow over the entire surface of the blow candle. However, this inevitably leads to irregularities due to preferred outflow regions, which also have turbulence. However, it is not possible to increase the gas permeability in the blow jacket, since the effect of the non-uniformity of the cooling air emerging in the regions of the blow candle increases.

From DE 37 08 868 AI or US 4,285,646 it is also known that guide means are provided within the blow candle to influence the cooling air flow emerging through the blow jacket. These guide means are preferably used to implement certain blow profiles on the blow candle. However, the outlet flow characteristic of the porous structure of the bladder jacket cannot be influenced by this.

Accordingly, it is an object of the invention to provide a device for producing melt-spun threads of the generic type, with which textile threads can be produced with a high degree of uniformity, in particular with regard to Uster, elongation and strength.

Another object of the invention is a device for melt spinning and cooling and a device for cooling the input to further develop the type mentioned in such a way that a cooling air flow generated uniformly over the entire cooling section for cooling the filament sheet predominates. The object is achieved according to the invention by a device for melt spinning and cooling with the features according to claim 1, and by a device for cooling a filament sheet according to claim 14.

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

The invention is characterized in that the cooling air emerging from the blow candle is converted into a laminar flow in a predetermined direction before striking the filament strands. An air movement of the cooling air that is suitable for cooling fine filament strands can thus be generated, which leads to a uniform formation and solidification of the individual filament strands. Irregularities in the uniformity of filament to filament and in the yarn uniformity over time could thus advantageously be avoided. The additional jacket provided for equalization and for aligning the cooling air flow has a material with a large number of openings, which essentially does not cause any additional flow resistance. The blowing characteristic of the blowing jacket enclosed by the additional jacket is thus essentially not influenced and only a conversion of the cooling air emerging as a turbulent flow from the blowing jacket into a laminar flow is carried out.

In order to obtain a uniform penetration of the filament curtain, the further development of the invention has proven itself in particular, in which the material of the additive has essentially radially oriented openings in order to bring about a cooling air flow directed transversely onto the filament strands. Here is a substantially rectangular from the surface of the jacket Additional jacket exiting laminar flow of the cooling air is generated. However, it is also possible to generate different orientations of the cooling air over the length of the blow candle in order to obtain special pre-cooling or after-cooling effects by a cooling air flow inclined in the direction of the thread running or a cooling air flow inclined in the direction of the thread.

A multilayer wire mesh with a large open flow area is particularly advantageous as the material for the additional jacket. Negligible flow resistances occur here. However, perforated or honeycomb sheet metal bodies can also be used, which are preferably seamless.

In a preferred development of the invention, it is provided that the additional jacket bears with contact on the blow jacket and is held by the blow candle. This embodiment has the advantage that a support effect is generated on the blow jacket by the additional jacket, so that the blow jacket can be made of paper or low-strength foam.

The blow jacket and the additional jacket can advantageously be joined together to form a structural unit which considerably simplifies the handling of the blow candle.

However, there is also the possibility of arranging the additional jacket at a distance from the blow jacket, the additional jacket being arranged on a holding device carrying the blow candle. This development of the invention has the advantage that the entire outer surface of the blow jacket can be used to generate the cooling air flow.

In addition, the additional jacket can be arranged interchangeably on the holding device, so that when changing a thread titer or a polymer appropriate adaptation of the cooling can be carried out by replacing the additional jacket.

In order not to receive any axial currents in the case of exchangeable additional shells in the annular space formed between the blow jacket and the additional jacket, the additional jacket is held in an operating position at the free end of the blow candle by means of a spacer on the stop of the spinning device by the holding device. The additional jacket is thus securely sealed at the ends between the spacer and the holding device.

For maintenance purposes or for cleaning the spinneret, the blow candle with the additional jacket can advantageously be moved from the operating position away from the spinning device into a waiting position by the holding device. For this purpose, the holding device is adjustable in height and / or pivotable relative to the spinning device.

In order to ensure reliable guidance of the filament strands along the blow candle, according to a preferred development of the invention, the holding device below the blow candle is provided with a preparation device which has a preparation ring contacted by the filament sheet. This means that the entire filament set is evenly prepared into a synthetic thread before being brought together.

The filament sheet is preferably brought together by a collecting thread guide arranged after the preparation device.

Depending on the thread to be produced, one or more can be

Provide handling devices that are upstream of the take-up device. Partly stretched POY threads or fully stretched FDY threads can be produced, for example, from a meltable synthetic polymer for example polyester, polyamide or polypropylene. Basically, it can be used to produce textile or technical threads.

The invention also extends to processes of this type, in which an annular sheet of filaments are to be cooled while maintaining high uniformity, such as, for example, in the production of staple fibers. In this case, the filament strands can advantageously be cooled by a device according to the invention before they are combined to form a spinning cable. In addition to the advantageous developments according to claims 15 and 16, the device according to the invention can also be developed according to claim 14 by the aforementioned features and combinations of features of claims 4 to 13. The device according to the invention is explained in more detail below with the aid of a few exemplary embodiments and with reference to the accompanying drawings.

They represent:

Fig. 1 shows schematically a view of a first embodiment of the device according to the invention

Fig. 2 shows schematically a view of a further embodiment of a device according to the invention

3 schematically shows a detail from the jacket of the blow candle of the exemplary embodiment according to FIG. 2

1 schematically shows a first exemplary embodiment of a device according to the invention for melt spinning, cooling and winding up a synthetic one

Thread shown. The device has a spinning device 1, a KϋMeinrichtung 6 arranged below the spinning device 1 and a winding device 19 arranged downstream of the cooling device 6. The spinning device 1 contains a heated spinning head 2, which carries a spinneret 3 on its underside. The spinneret 3 has an annular arrangement of a plurality of nozzle bores on the underside for extruding a plurality of filament strands. Further melt-conveying and melt-conveying components are arranged within the spinning head 2, not shown here. The polymer melt supplied via a melt feed 4 is conveyed to the spinneret 3 by a spinning pump (not shown here). A plurality of spinnerets are usually held within the spinning head 2 in order to produce a plurality of threads side by side in parallel. Since the invention can easily be extended to two, three or more threads, the arrangement for producing only one thread has been shown for the sake of clarity. A cooling device 6 is arranged below the spinning device 1. The Kü device 6 has a blow candle 7, which is arranged on a holding device 10. The blow candle 7 is hollow-cylindrical and contains a blow jacket 8, which is formed from a porous material. The material of the blow jacket 8 can be formed by wound paper layers, foam of the sintered metal. At the free end of the blow candle 7, the blow jacket 8 is closed by an end piece 15. The blow jacket 8 is arranged on the holding device 10 with the opposite end. At a distance from the blow jacket 8, an additional jacket 9 is arranged on the holding device 10, which encloses the blow jacket 8 in the form of a jacket. The blow candle 7 and the additional jacket 9 are arranged via a spacer 14 in the center of the spinneret 3 on the underside of the spinning head 2. Here, the spacer 14 is held at the end of the blow candle 7 by the holding device 10 at a stop 22 on the underside of the spinneret 3. The additional casing 9 and the blow candle 7 held in the interior of the additional casing are in their operating position in the center of the spinneret 3. The holding device 10 is designed to be height-adjustable and pivotable for positioning the blow candle 7 and the additional casing 9. In order to guide cooling air into the interior of the blow candle 7, the holding device 10 is coupled to an air duct 11. The air supply 11 is connected to a cooling medium source, not shown here, for example a blower. Within the holding device 10, the air supply 11 is coupled to the open end of the blow jacket 8 in the holding device 10 via a channel system.

A preparation device 12 is formed on the circumference of the holding device 10. The preparation device 12 is formed here by a preparation ring 13, which has an emerging preparation agent on its surface and wets the filament strands 5 which run along the circumference of the preparation ring 13. Below the cooling device 6, an S-continuous thread guide 17 is provided, by means of which the filament strands 5 are combined to form a thread 16.

A treatment device 18 is provided for pulling off the filament strands 5 or the thread 16. The treatment device 8 is shown symbolically here, since it depends on the thread type to be produced in its nature and composition of the aggregates. One or more godets or godet units for pulling off, guiding or stretching the thread can thus be present. Furthermore, swirling devices, additional preparation devices or thread choppers with suction or thread sensors can be integrated.

Alternatively, the thread 16 or the filament strands 5 could also be drawn off directly by the winding device 19.

A take-up device 19 is provided below the treatment device 18 to receive the threads. The winding device 19 is through the

Representation of a coil 20 and one adjacent to the circumference of the coil 20 Pressure roller 21 shown symbolically. Here, the thread 16 is wound into the bobbin 20.

In the exemplary embodiment of the device according to the invention shown in FIG. 1, a melted polymer material, for example by an extruder or a pump, is fed into the spinning device 1. For this purpose, the polymer melt enters the spinning head 2 via the heated melt feed 4 and is guided to the spinneret 3 under pressure. The spinneret 3 is circular in shape and contains on its underside one or more annular rows of holes from which the polymer melt emerges as fine filament strands 5. After the filament strands 5 have been extruded through the spinneret 3, the filament strands 5 pass through the cooling device 6 arranged below the spinning device 1. To cool the ring-shaped filament strands 5, cooling air is fed in via the air supply 11, which air is led into the interior of the blow candle 7 under a pre-pressure becomes. Due to the pre-pressure, a cooling air flow radially penetrates the blow jacket 8 of the blow candle 7. The flow arising at the periphery of the blow jacket 8 is essentially determined by the pore distribution of the material of the blow jacket 8. The cooling air flow emerging from the blow jacket 8 of the blow candle 7 is predominantly turbulent. As a material, the blow jacket 8 could be formed by multilayer paper layers or foam or sintered metal. The cooling air flow emerging from the blow jacket 8 is then passed through the additional jacket 9. The additional jacket 9 consists of a material with a plurality of openings, which on the one hand oppose a very low flow resistance to the cooling air flow and on the other hand lead to an orientation of the cooling air flow. For this purpose, the material preferably has radially aligned openings, so that a transverse laminar flow is generated over the entire cooling section on the additional jacket 9 and penetrates the filament curtain for cooling the filament strands 5. The equalization of the cooling air flow through the additional jacket 9 causes a uniform inflow of the filament strands without Turbulences. This results in a high level of smoothness, which is particularly evident in the uniformity of the filament and thus in the thread. The 1-minute flow caused by the additional jacket 9 to cool the filament strands was retained even when the admission pressure of the cooling air was changed within the blow candle to increase the amount of cooling air.

At the end of the cooling section, the filament strands 5 are brought into contact with the preparation ring 13 of the preparation device 12 on the circumference of the holding device 10. After the preparation, the filament strands 5 are joined together to form the thread 16, which is wound into a bobbin 20 after treatment.

The device according to the invention shown in FIG. 1 is particularly suitable for producing textile threads. Both POY threads with partial stretching or FDY threads with full stretching can be produced. In order to be able to adapt to the thread type to be produced also in the cooling, the additional sheath is in the embodiment of the device according to the invention shown in FIG. 1. 9 interchangeably coupled to the holding device 10. The holding device 10 is movable so that the blow candle with the additional jacket can be moved from the operating position into a waiting position. An exchange of the additional jacket 9 can be carried out within the waiting position. For example, the hole geometries or the hole arrangements in the additional jacket 9 can be changed by choosing a certain material or a certain shape.

2 shows a further exemplary embodiment of the device according to the invention. The exemplary embodiment is essentially identical to the previously shown exemplary embodiment according to FIG. 1, so that only the differences are described below and otherwise reference is made to the preceding description. In the 'shown in Fig. 2. In an embodiment, the kitchen device 6 arranged below the spinning device 1 is formed by a blow candle 7 in order to generate a radially directed cooling air flow. Here, an additional jacket 9 is placed directly in contact with the blowing jacket 8 over the blowing candle 7. The blow jacket 8 and the additional jacket 9 form a structural unit which is held at the free end by a common end piece 15. The blow jacket 8 and the additional jacket 9 are attached to the holding device 10 with the opposite end, the blow jacket 8 having an open end for receiving the cooling air. The function of the additional jacket 9 and the blow jacket 8 and the structure of the additional jacket 9 and the blow jacket 8 is essentially identical to the previous exemplary embodiment, so that reference is also made to the function of the aforementioned embodiment.

In the embodiment shown in FIG. 2, the bladder jacket 8 is directly supported by the additional jacket 9. The blow jacket 8 can thus be produced with low strength, for example from foam or thin layers of paper. In order to be able to use the resistance characteristic of the blow jacket 8 essentially unchanged for the generation of a cooling air flow, the additional jacket 9 has a material which has a negligible flow resistance in comparison to the material of the blow jacket 8.

3 shows an exemplary embodiment of the structure of the blow jacket 8 and the additional jacket 9. The blow jacket 8 is formed from a foam material. The additional jacket 9 is arranged on the outer circumference of the blow jacket 8. The additional jacket 9 is formed by a multi-layer wire mesh 23. The multi-layer wire mesh 23 forms essentially radially aligned openings 24, which leads to equalization of the cooling air flow emerging from the blow jacket 8. At the periphery of the additional sheath 9, a transverse, in-line cooling air flow emerges in order to penetrate the filament strands surrounding the additional sheath 9. The structure of the spinning device and the cooling device shown in the exemplary embodiments in FIGS. 1 and 2 is exemplary. For example, the cooling air supply to the blow candle can also be introduced via the spinning head. Likewise, the preparation device on the circumference of the holding device can be replaced by a thread guide ring. In this case, a preparation device would be assigned to the S-thread guide. The design and the length ratio of the spacer to the length of the blow candle is also exemplary. Basically, the length of the spacer allows a calm zone to be formed in which the filaments are not actively cooled. Post-heaters could also be arranged in such a zone, for example, in order to influence the molecular orientation of the filament strands.

In addition, the invention also extends to processes of this type, in which the filament strands are joined together after cooling to produce staple fibers as a tow or tow. For this purpose, devices for cooling can be used which are identical in construction to the exemplary embodiments according to FIGS. 1 and 2. In this respect, reference can be made to the above descriptions for the explanation of such devices.

Reference symbol list spinning device spinning head spinneret melt feed filament strand cooling device blowing candle blowing jacket

additional coat

holder

Air - uführung

Prep irationseiririchtung

finishing ring

spacer

tail

thread

S - mmelfadenführer

treatment facility

Aui winding device?

Kitchen sink

pressure roller

attack

wire cloth

openings

Claims

claims

1. Device for melt spinning, cooling and winding a thread (16) formed from a plurality of filament strands (5) with a spinning device (1) which has a spinneret (3) for extruding an annular filament sheet (5), with one below the Spinning device (1) arranged cooling device (1) for cooling the filament strands (5) forming the filament bundle and with a winding device (19) for winding up the thread (16) formed after the filament strands (5) have cooled, the cooling device (6) has a blow candle (7) which is held essentially centrally to the spinneret (3) in an operating position and which contains a porous blow jacket (8) for generating a cooling air flow flowing from the inside out, characterized in that a blow jacket (8 ) the blow candle (7) is provided in the form of a jacket surrounding the additional jacket (9) and in that the additional jacket (9) is made of a material with a plurality of ovens Fungen (24), which leads to an orientation of the cooling air flow without significant flow resistance.

2. Device according to claim 1, characterized in that the material of the additional jacket (9) has substantially radially aligned openings (24) in order to bring about a transverse to the filament strands (5) directed cooling air flow.

3. Device according to claim 1 or 2, characterized in that the material is preferably formed from a multi-layer wire mesh (23).

4. Device according to one of claims 1 to 3, characterized in that the additional jacket (9) bears with contact on the blow jacket (8) and is held by the blow candle (7).

5. The device according to claim 3, characterized in that the blow jacket (8) and the additional jacket (9) are joined together to form a structural unit.

6. Device according to one of claims 1 to 3, characterized in that the additional casing (9) is arranged at a distance from the blowing jacket (8) and is held by a holding device (10) carrying the blowing candle (7).

7. The device according to claim 6, characterized in that the additional jacket (9) is interchangeably arranged on the holding device (10).

8. The device according to claim 6 or 7, characterized in that the additional jacket (10) in the operating position at the free end of the blow candle abuts a spacer (14) which supports the blow candle (8) relative to the spinning device (1).

9. Device according to one of claims 1 to 8, characterized in that the additional jacket (9) with the blow candle (8) by the holding device (10) from the operating position away from the spinning device (1) can be guided into a waiting position.

10. Device according to one of the preceding claims, characterized in that the holding device (10) below the blow candle (8) carries a preparation device (12) which has a preparation ring (13) contacted by the filament strands (5).

11. The device according to claim 10, characterized in that the preparation ring (13) is followed by a Sam elfadenführer (17) through which the filament strands (5) to a synthetic thread (16) are brought together.

12. Device according to one of claims 1 to 11, characterized in that the holding device (10) is designed to be pivotable relative to the spinning device (1).

13. Device according to one of the preceding claims, characterized in that one or more treatment devices (18) are provided which are arranged upstream of the winding device (19).

14. Device for cooling a freshly extruded filament sheet with a blow candle (7), which is arranged essentially centrally to the ring-shaped filament strands (5) of the filament sheet and which contains a porous blow jacket (8) for generating a cooling air stream flowing from the inside out , characterized in that an additional jacket (9) is provided which surrounds the blow jacket (8) of the blow candle (7) and that the additional jacket (9) consists of a material with a multiplicity of openings (24), which without substantial flow resistance to one Alignment of the cooling air flow leads.

15. The apparatus according to claim 14, characterized in that the material of the additional jacket (9) has substantially radially aligned openings (24) in order to bring about a cooling air flow directed transversely onto the filament strands (5).

16. The apparatus of claim 14 or 15, characterized in that the material is preferably formed from a multi-layer wire mesh (23).