WO2007023003A1

WO2007023003A1 - Multiple spinning nozzle arrangement and method for suctioning and blowing

Info

Publication number: WO2007023003A1
Application number: PCT/EP2006/008418
Authority: WO
Inventors: Stefan Zikeli; Friedrich Ecker
Original assignee: Zimmer Aktiengesellschaft
Priority date: 2005-08-23
Filing date: 2006-08-23
Publication date: 2007-03-01
Also published as: TWI330674B; CN101292063B; TW200714755A; ZA200802268B; KR20080038245A; KR100995296B1; DE102005040000B4; DE102005040000A1; CN101292063A

Abstract

The invention relates to a device (1) for the extrusion of spinning filaments (9) from a spinning solution which contains water, cellulose and tertiary amino oxide, which is the case in said lyocell-method. Said device comprises a first spinning nozzle (6) which comprises a plurality of extrusion openings (8). A first spinning filament chamber (11) which is traversed by the spinning filaments (9) when in operation, connects itself directly to the first spinning nozzle in the opening direction of the extrusion opening. Also, at least one device (21), which is used to produce a forced flow of gas through the spinning filament chamber, is provided. According to the invention, a second spinning nozzle (7) comprising a second spinning filament chamber (12), which is arranged at a distance from the first, is provided adjacent to the first spinning nozzle in order to increase the packing density of the spinning nozzle. Also, the blowing device (21), which is used to produce a forced flow of gas also through the second spinning filament chamber (2), is arranged at least sectionally between the first and the second spinning filament chamber.

Description

Multi-spinneret arrangement and methods with suction and blowing

The invention relates to a device for the extrusion of spun filaments from a

A spinning solution comprising water, cellulose and tertiary amine oxide, having a first spinneret having a multiplicity of extrusion orifices, with a first spider filament space directly adjoining in the opening direction of the extrusion orifices

Extrusion ports connects, and with at least one blower device, through which a forced flow of gas through the first spinning filament space can be generated.

The invention further relates to a lyocell process by which spin filaments are extruded.

The principles of making spinning filaments from a spinning solution containing cellulose, water and tertiary amine oxide, preferably N-methylmorpholine N-oxide (NMMO), are described in US-A-4,246,221 and US-A-4,416,698. Accordingly, the production of spun filaments takes place essentially in three steps: First, the spinning solution is extruded through the extrusion opening to the spun filaments. Then the spun filaments are passed through an air gap, where they are stretched and the desired fiber strength is adjusted. Subsequently, the spun filaments are passed through a precipitation bath with a non-solvent, where the tertiary amine oxide is washed out and the cellulose is precipitated.

This process is now carried out on a large scale with the sequence of process steps described in US-A-4,246,221 and US-A-4,416,698. The standardization association for man-made fibers, BISFA, assigned the name "Lyocell" to the fibers produced by these processes.

The problem with the lyocell process, however, is that the freshly extruded spun filaments have a high surface tack, which only reduces on contact with the precipitation bath. When passing the spun filaments through the spider filament space occupied by them in the air gap, there is therefore a risk that the spider filaments touch each other and stick together immediately. The risk of sticking can in principle be reduced by adjusting the operating and distribution parameter, such as the tension in the spinning filament space, the height of the spinning filament space, the number of spinning filaments per unit area, the viscosity, the temperature and the spinning speed are reduced. However, when bonds occur, this negatively affects the manufacturing process and fiber quality, as bonds can lead to breaks and thick spots in the spun filaments. In the worst case, the production process must be interrupted and the spinning process restarted, which entails high costs.

Nowadays, the yarn manufacturers, as buyers of the spinning filaments and part of the textile processing chain, demand freedom of gluing from the spinning filament manufacturers. This means that the individual filament stacks must not be glued together, as otherwise irregularities occur in, for example, the yarn thickness.

This requirement is problematic in that a high efficiency in the production of lyocell fibers, mainly staple fibers and filaments, can only be achieved if the extrusion openings are arranged at a small distance from each other, the spinning filament density in the spinning filament space is so high. At the same time, a smaller distance between the spun filaments increases the risk of sticking due to accidental contact of the spider filaments.

Furthermore, it is advantageous for improving the mechanical and textile properties of lyocell fibers if the spinning filament space behind the extrusion openings is as large as possible, since the stretching of the spinning filaments spreads over a greater run length and tensions in the freshly extruded spun filaments are reduced more easily can be. However, the longer the spinning filament space is in the direction of extrusion, the lower is the security against spinning or the greater the danger that the production process must be interrupted due to spinning filament bonds and tensions can be reduced more easily in the freshly extruded spun filaments.

Based on the principles of US-A-4,246,221, there are some solutions in the prior art which attempt to improve both economics and spinning efficiency. To improve safety in the production of spun filaments from a spinning solution containing cellulose, water and tertiary amine oxide.

For example, US Pat. No. 4,261,941 and US Pat. No. 4,416,698 describe a process in which the spun filaments are brought into contact with a non-solvent immediately after extrusion in order to reduce surface tackiness. Subsequently, the spun filaments are passed through a precipitation bath. However, the additional wetting of the continuous moldings by the non-solvent before passing through the precipitation bath is too costly and too expensive for large-scale industrial use. Therefore, this process has been further developed in WO-A-03/100 140, so that the wetting of the continuous shaped bodies in the spider filament space with the non-solvent takes place through a porous material. However, this technique reaches its limits, since not every spinneret geometry allows a uniform wetting of all spun filaments.

Another way to increase the spinning density, ie the number of extrusion openings or spun filaments per unit area, is described in WO-A-93/19 230: In the apparatus described there, the spider filaments become transversal immediately after extrusion by horizontal blowing cooled to the extrusion direction with a cooling air flow. By this measure, the surface tackiness of the spun filaments is reduced. As a result, the air gap can be lengthened and the spinning density increased. It is stated in WO-A-93/19 230 that the surface tackiness is reduced by cooling the spinning filaments on their surface. The blowing can take place simultaneously from both sides of a spinneret with extrusion orifices arranged on a circular surface or, distributed around the entire circumference, radially directed from outside to inside.

The problem with the solution of WO-A-93/19 230, however, that the cooling air flow occurs in interaction with the extrusion process directly to the extrusion openings and negatively affected. In particular, no uniform quality of the spun threads can be achieved with the method of WO-A-93/19 230, since not all spinning filaments are detected in the same way by the cooling air flow. The danger of Bonding is also not sufficiently reduced in the process of WO-A-93/19 230.

In order to allow a more uniform blowing of the continuous moldings immediately after exiting the extrusion openings, in the device of WO-A-95/01 470 an annular nozzle is used in which the extrusion openings are distributed on a substantially annular surface. The blowing with a cooling air flow takes place through the center of the annular nozzle first in the axial direction and then through the annulus of the spinning filaments in the radial direction horizontally from the inside to the outside. The air flow is held at its exit from the blowing device Iamarin. A constructive development of the annular nozzle of WO-A-95/01 470 is described in WO-A-95/01 473.

Although the solutions of WO-A-95/01 470 and WO-A-95/04 173 actually lead to a more uniform blowing of the spinning filaments in the spinning filament space, but the ring arrangement of the spinning filaments leads to problems in the passage through the precipitation bath: Since the Spin filaments on a circular ring surface in the precipitation bath and drag the Fällbadflüssigkeit with it, arises in the area around the center of the annular surface undersupplied with Fällbadflüssigkeit area, which leads to a strong compensating flow of Fällbadflüssigkeit through the ring of the spun filaments through and to a churned Fällbadoberfläche. This in turn causes the occurrence of adhesions in the spider filament space. In addition, it can also be expected in the devices of WO-A-95/01 470 and WO-A-95/01 473 in operation that the essential for the mechanical and textile product properties extrusion conditions are difficult to control directly at the extrusion openings.

The problems of annular nozzles when immersing the spinning filaments in the precipitation bath, as described for example in WO-A-96/20300, can be avoided by rectangular nozzles in which the extrusion openings are arranged on a substantially rectangular base. Such a rectangular nozzle is described for example in WO-A-94/28 218. This document is the closest prior art. It describes that the spider filaments are cooled and stabilized by a forced gas flow through the air gap parallel to the surface of the precipitation bath. The forced gas flow is generated by a suction device arranged along the longitudinal side of the spinneret, directed towards the spider filaments, and additionally by a blowing device, which may face the spinner filaments of the suction device.

A disadvantage of the rectangular nozzle described in WO-A-94/28218 is that in a combination of this rectangular nozzle with a spinning cone to similar bath turbulence as in the above-described devices of WO-A-95/01470 and WO-A-95 / 04173 is coming. Because of the funnel opening arranged at the lower end of the spinning funnel, the precipitation bath liquid and the filament bundle moved by the precipitation bath liquid simultaneously emerge, which leads to undesirable turbulences and hence to adhesions of the filaments. In addition, with a large outflow opening, the throughput quantity of the precipitation bath liquid increases extremely, which either leads to excessive turbulence in the precipitation bath liquid or makes a thick filament bundle necessary, which increases the risk of adhesions. With a small diameter of the outflow opening, although the turbulences in the precipitating bath liquid are reduced, the small diameter has a negative effect on the throughput of spinning filaments with respect to productivity.

In WO-A-98/18 983, the concept of rectangular nozzles is further developed with in-line extrusion openings. It is pointed out in this document that the extrusion openings are spaced differently in a row than the rows of extrusion openings with each other.

In order to cool the spinning filaments more strongly in the spinning filament space, WO-A-03/057 952 describes that the cooling gas flow from the blowing device already exits in a turbulent manner. In the device of WO-A-03/057 951, the spinning filament space is subdivided into three zones by the cooling gas flow generated by the blowing means, namely a first shielding area extending from the extrusion opening and extending to a cooling area which in turn passes through the cooling area Influence of the cooling gas flow is determined. From the Fällbadoberfläche opposite the extrusion device, a second shielding region is arranged, which extends to the lower end of the influence range of the cooling gas flow.

In both documents, the cooling gas flow is also inclined in the extrusion direction of the spinning filaments, which leads to better spinning results.

In addition to this type of blowing of the spinning filaments in the spinning filament space, there is still a blowing in the direction of extrusion of the spinning filaments, with the same time a delay is to be generated. Such a blowing is described, for example, in WO-A-01 / 81,663 and in WO-A-01/86 041. The problem with this type of blowing, however, is that the gas flow must be heated so as not to overly cool the extrusion orifices around which it flows. The cooling effect is therefore limited in these devices, so that only small effects on the spinning safety can be achieved.

Finally, in WO-A-01/68918, the gas stream is directed to the surface of the precipitation bath to calm it. Again, a cooling effect and thus an increase in the spinning safety is not achieved. The gas stream should not affect the spinning filaments in WO-A-01/68918 as far as possible.

As lyocell technology has become established on a large industrial scale in recent years, the cost pressure on manufacturers is increasingly growing. One way to counteract this cost pressure is still to increase the spinning density, ie the number of spun filaments per unit area. The measures described above are reaching their limits. The present invention is therefore based on the object to improve the known devices so that the spinning density can be further increased.

This object is achieved according to the invention for the device mentioned above, that in addition to the first spinneret a second spinneret is provided with a second spaced apart from the first spinning filament and the fan means at least partially disposed between the first and the second spinning filament and by the fan means a forced flow of Gas is generated by the second spinning filament space. For the method mentioned in the introduction, this object is achieved in that the spinning solution is extruded through two juxtaposed spinnerets and then passed through the spinning film dreams adjoining the spinnerets, wherein in the region between the at least two spun-filament dreams a forced flow of gas through the at least two spun-filament dreams is produced.

With this measure, spinnerets with a high hole density can be arranged at a tight distance from each other, without any detrimental effect on the spinning density due to the increased spinning solution throughput. Surprisingly, it has been found that in such a multi-spinneret arrangement, a forced flow generated in the region between the spider-filament spaces of the two spinnerets increases the spinnability. The forced flow prevents the formation of gaseous material with a high moisture content in the region between the spinning film dreams, which would slow down the surface drying of the spinning filaments in the air gap. This problem occurs precisely when two spun filament strands adjoin one another in such a way that hardly any fresh air can be supplied on their sides facing each other and the heat radiation of the spun filaments from one spin filament space heats the spider filaments in the other spider filament space. Surprisingly, in such an arrangement, an exhaust seems to be more efficient than a blowing, so that in a particularly advantageous embodiment, the blower device comprises a suction device and the forced flow is generated by suction. In the following, further developments of the solution according to the invention are described, which in each case are advantageous in their own right and can be combined as desired.

To aspirate sufficient moisture-saturated air from the spinneret dreams, not less than 0.3 liter of gas per extruded gram spinning solution should be aspirated from a single filament space, but preferably at least 0.5 to 0.9, more preferably at least 0.9 to 1; 8 liters per extruded gram spinning solution. At high spin solution throughput and large spinnerets with multiple extrusion orifices, the amount of air aspirated should be at least 2 liters per extruded gram spinning solution.

In operation, the interference of the adjacent spider film dreams may become too great if the spacing between the spun filaments becomes substantially smaller than the simple depth of the spinnerets. If the distance between the spider film dreams is too small, the proportion of heat radiation over the heat transfer with the aid of the gas substance predominates. Too large distances above about four times the spinneret parts, the process is too uneconomical.

In an advantageous embodiment, the suction device may have a slot-shaped opening, for example, or a series arrangement of such openings in the middle region between the two spider film dreams. However, in order to improve the effect of the suction, at least a first suction opening facing the first spinning filament space and at least one second suction opening facing the second spinning filament space may be provided. By this measure, a directed suction is possible, which leads to a targeted flow through the two Spinnfilamenträume and thus during operation of the device by the spider filaments in the spider web dreams through.

In order for the gas flow generated by the suction device to extend as far as possible into the spinning filament space, it may furthermore be provided that the extrusion openings of the first and second spinneret are each arranged on an elongate base surface. che are arranged and the respective longer sides of the bases of the first and second spinneret face each other. In this way, that side of the spinneret is detected by the gas flow from the exhaust over the entire width, which has the most spinning filaments. In the suction direction, the smallest width of the spinning filament space is arranged so that the suction flow covers the entire width of the spinning filament space. In this arrangement, the suction device is particularly efficient. The base area, on which the extrusion openings are arranged, can be designed in a further embodiment, in particular rectangular.

In order to keep the design complexity of the device low, according to a further advantageous embodiment, the suction device can be made substantially tubular at least in the region between the spinning filaments, wherein the at least one suction opening is formed in the tube wall. The production of the suction opening is connected in this embodiment with little effort, since standardized components can be used, little expensive. The tube interior can be used to divert the extracted gas to, for example, a pumping device or filter device.

Furthermore, it has proved to be advantageous if, due to the volume occupied by the suction device, a not insignificant portion of the area between the two spinneret filaments is filled, so that large-area gas flows, which otherwise act on the spider filaments in the spinnar filing space, are filled by the suction device could impair the spinning security, be prevented in the area between the spider films dreams. This effect can be achieved if the suction device extends over at least one third of the height of the spinning filament space in the extrusion direction and / or at least half of the distance between the two adjacent spinneret film spaces.

The gas flow generated by the suction device can be reinforced in a further embodiment by providing a blowing means for generating a directed to the first or second spinning filament chamber gas stream. In this case, the first or second spinning filament space is so between the blowing device tion and arranged the suction device that results in a forced flow from the blowing device through the first or second spinning filament through to the suction.

In particular, if a blowing device is directed both at the first spinning filament space and at the second spinning filament space, there is a forced flow through both filament dreams to the suction device, which can then have the greatest effect.

If the output of spinning filaments is to be further increased, then, according to a particularly advantageous embodiment, a third and fourth spinneret with a third and fourth spinning filament space and a further suction device between the third and fourth spinning filament space can be provided. The arrangement comprising the third and the fourth spinneret and the suction device can be designed as the above-described arrangement with first and second spinneret and suction device. Incidentally, the device can be expanded in this way in pairs by two spinnerets with a suction device arranged therebetween, so that a spinneret field results.

In particular, the third and fourth spinneret can be arranged next to the first and second spinneret, and between the second and third spinneret, a blowing device for generating a gaseous stream directed onto the second and the third spinning film chamber. Such a packing of spinning nozzles, each with a blowing device and a suction device between the spinning film dreams, leads to an efficient throughflow of the spinning film dreams also of those spinning nozzles which are arranged in the interior of the spinning nozzle field. Thus, for example, in at least three juxtaposed spinnerets, each with a spinneret associated with a spinneret space in the area between the spider webs, alternately a suction device and a blowing device may be provided. In order to produce a stable and directed throughflow of the spun-film dreams, in each case the suction device and blowing device, which lie opposite one another with the interposition of a spinning filament space, can have apertures directed towards one another. For example, first blown openings directed towards one spinning filament space and the other directed at the other spinning filament chamber can be integrated into a blowing device located between two spinning film spaces. A corresponding arrangement can also be provided in the suction device for the suction openings.

Furthermore, the blowing device can also be designed in accordance with the suction device and, for example, extend over at least a quarter of the height of the space between the spinning film dreams and, for example, dip into the precipitation bath in the same way as the suction device.

In order to simultaneously use the suction device according to a further advantageous embodiment to block flows in the precipitation bath and calm the Fällbadoberfläche, it can be provided that the suction or blowing device is immersed in the operation of the device at least partially in a Fällbadflüssigkeit, with a Fällbadbehälter, which adjoins the spinning filament space is filled.

The surface of the precipitation bath can be calmed even better if the suction direction in the area of the precipitation bath surface is strongly immersed in the precipitation bath inclined towards the perpendicular to the precipitation bath surface or has a strongly broken surface in the immersion area. In this way, surface waves are not reflected back into the precipitation bath but are absorbed or broken.

In the following the invention will be explained by way of example with reference to embodiments with reference to the drawings. In this case, the different features in the different embodiments can be combined with each other as desired. Show it:

1 shows a first embodiment in a schematic perspective view;

FIG. 2 shows a second exemplary embodiment in a schematic side view;

Figure 3: a third embodiment in a schematic side view.

First, the construction of a first embodiment will be explained with reference to FIG.

FIG. 1 shows a schematic perspective view of a device 1 for extruding spun filaments from a spinning solution containing cellulose, water and tertiary amine oxide, N-methylmorpholine-N-oxide being used as the tertiary amine oxide. The spinning solution is, as shown schematically by the arrow 2, fed via a heated pipe system 3 a first spinner head 4 and a second spinner head 5 arranged next to the first spinner head 4. The first spinner head 4 is provided with a first spinneret 6 and the second spinner head 5 with a second spinneret 7.

As exemplified by the first spinner head 4, each spinneret 6 is provided with a plurality, typically several tens of thousands, of extrusion orifices 8. For the sake of clarity, only a few extrusion openings 8 are shown in FIG. 1 by way of example. The spinnerets 6, 7 are rectangular nozzles, in which the extrusion openings 8 are arranged on a substantially rectangular base. The spinnerets 6, 7 are arranged side by side, wherein the longer sides of the rectangular base face each other.

In operation, the spinning heads 4, 5 supplied spinning solution according to arrow 2 extruded through the extrusion openings 8 to spin filaments 9, which are indicated only schematically in Figure 1. In the extrusion direction, an air gap 10 connects directly to the spinnerets 6, 7 or the extrusion openings 8, which is traversed by the spinning filaments during operation of the device 1. A dot-dash line in FIG. In this case, region 11 identifies the section of the air gap 10 which is occupied by the spinning filaments 9 during operation of the device. This area is referred to below as the spider filament space. The first spinneret 6 is a first such Spinnfilamentraum 11, the second spinneret 7, a second such Spinnfilamentraum 12 assigned.

After the air gap 10, the spun filaments 9 pass through a precipitation bath 13 which contains a precipitation bath liquid, essentially a non-solvent for the cellulose, water and tertiary amine oxide solution system, as well as other components flushed from the spun filaments 9 and impregnating additives for the spun filaments. The precipitation bath 13 is received in a Fällbadbehälter 14 and forms a Fällbadoberfläche 15 in operation, which is located at a predetermined distance from the extrusion openings 8. The spinning-film dreams 11, 12 end at the precipitation bath surface 15.

The precipitation bath 13 is fed to the Fällbadbehälter 14 via a feed line 16 according to arrow 17. A wall of the Fällbadbehälters 14 may be configured as a weir over which the precipitation bath 13 pours, as shown schematically by the reference numeral 18. In this way, the distance of the Fällbadoberfläche 15 is determined by the extrusion openings 8 and kept constant. The overflowed precipitation bath 18 can be supplied to a reprocessing device, not shown in FIG. 1, in which the substances washed out by the spun filaments, primarily the tertiary amine oxide, are removed. Subsequently, the Fällbadflüssigkeit be fed back to the supply line 16, so that an environmentally friendly cycle is formed.

In the precipitation bath 13 two deflection means 19a, 19b are further arranged, which are each associated with one of the two spinnerets 6, 7. By the deflecting means 19a, 19b, the spinning filaments 9 are each deflected to a spinneret 6, 7 and led to the outside of the precipitation bath 13 to further processing steps. The deflection means 19a, 19b are adjustable in height to facilitate piecing. A deflecting device 19a, 19b may be assigned a spinning filament space or a plurality of spider film dreams. The deflection means 19a, 19b are below the corresponding Spinndü- se 6.7 arranged that the spider filament share a spinneret 6, 7 immersed symmetrically in the precipitation bath. The withdrawal of the spinning filaments takes place in FIG. 1 in each case on both sides of the precipitation bath container 14, as indicated by the arrows P.

In the area 20 between the first spinning filament chamber 11 and the second spinning filament chamber 12, a fan device in the form of a suction device 21 is arranged, which has at least one suction opening 22. As shown in Figure 1, for example, two sets of suction openings 22, 23 may be provided, which are each associated with a spinning filament space 11, 12 and preferably aligned therewith.

In the interior of the suction device 21, an exhaust air line 24 is provided which removes the air 25 extracted from the region 20. The exhaust air line 24 may in particular be connected to a pump or suction fan, not shown in FIG. Furthermore, the section of the suction device 21 lying between the first spinning filament chamber 11 and the second spinning filament chamber 12 can be designed as a pipeline, in the wall of which the suction openings 22, 23 are located. In its lower part, the suction device 21 dips into the precipitation bath 13.

The function of the suction device 21 in the embodiment of Figure 1 is as follows:

Due to the at least one suction opening 22, 23, gas is sucked out of the region 20 between the two spinning-film dreams 11, 12, thus producing a forced flow through the two spinning-film dreams. At a spinning filament density of 1, 5 to 4 spinning filaments per square millimeter and a titer between 1, 1 and 1, 5 dtex, a temperature of the spinning solution just before extrusion between 85 ⁰ C and 120 ⁰ C and a delay between 5 and 13 and a Withdrawal speed between 15 and 70 m / min and a depth T of the spinneret between 5 and 60 mm, preferably between 9 and 40 mm, the extracted air per unit time should not be less than 2 liters per extruded gram spinning solution. With low throughput of spinning solution, the extracted air volume can also be between 0.9 and 1.8 liters per extruder. diertem gram spinning solutions, or for small spinnerets, also between 0.3 and 0.9 liters per extruded gram spinning solution. With these amounts of suction, the probability of sticking and breaking of filaments in the air gap could be significantly reduced.

By the suction process and by the physical presence of the suction device 21 as a flow obstacle in the area 20, on the one hand the formation of large-scale recirculation and compensation flows between the two spinning film dreams 11, 12 prevented and on the other hand, a gas flow through the spider film dreams 11, 12 from outside the Spinnenfilamenträume 11, 12 generated in the intermediate region 20. In order to achieve this, the height H of the suction device 21 in the extrusion direction of the spun filaments 9 is at least a quarter of the height of the spider film dreams 11, 12. The width B of the suction device 21 is at least half the distance A between the two spider film dreams 11, 12 in the direction Transverse to the longitudinal extent of the spinnerets 6, 7. The distance A is between about the simple of the depth T of the spinneret to about four times the depth T. Preferably, as shown in Fig. 1, the extraction device extends over the entire, but at least over half the length L of the spider film dreams 11, 12th

In a similar manner as in region 20, surface area of the precipitation bath surface 15 and the formation of waves on the precipitation bath surface are prevented by the area of the suction device 21 immersed in the precipitation bath 13.

FIG. 2 shows a further exemplary embodiment of the invention in a schematic side view. For the sake of brevity, only the differences from the first exemplary embodiment of FIG. 1 will be discussed, wherein the same reference numerals as in the first exemplary embodiment are used for elements which correspond in their structure or function to elements of the first exemplary embodiment.

The exemplary embodiment of FIG. 2 initially differs from the first exemplary embodiment in that two blower devices in the form of blower devices 25, 26 are provided which each supply a gas stream 27 to one of the blower nozzles Spinnenfilamenträume 11, 12 judge. The gas stream 27 has a temperature which is considerably lower than the temperature of the spinning filaments 9. In addition, the gas stream 26 is inclined relative to the horizontal 27 by an angle α down.

The first blowing means 25 is directed to the first spinning filament chamber 11 and generates in the spinning filament chamber 11 a forced flow of gas in the direction of the suction device 21, which, as in the first embodiment, between the first and the second spinning filament 11 and 12 is arranged. The suction device 21 has for targeted suction of the gas stream 29 to a suction opening 22 or a series of suction openings 22 which are facing the arranged behind the spinning filament 11 blowing means 25.

As a result of the interaction of the blowing device 25 and the suction device 21, the gas stream 29 can be guided stably through the spinning filament stream 11.

The second blowing device 26 generates, analogously to the first blowing device 25 in the second spinning filament chamber 12, a gas flow 30 corresponding to the gas flow 29 of the first spinning filament. One or more suction openings 23 oppose the second blowing device 26 in the direction of the gas flow 30 in order to selectively control the gas flow generated there suck.

Instead of the suction openings 22, 23 or in addition to these suction openings 31 and a single suction opening 31 may be provided, which is directed into the area between the two spider film dreams 11, 12 and sucks air from this area and so secondary flows in the area 20 due to the moving spinning filaments 9 prevented.

A pressure sensor 24a as well as a temperature sensor 24b and a wet knife 24c are arranged in the region 20 between the two spinning-film dreams and monitor pressure, temperature and humidity of the air in this area. If, for example, predetermined values for the temperature and humidity in the region 20 are exceeded, then the amount of extracted air 20 is increased until the setpoint values have fallen below again are. If, on the other hand, the pressure in region 20 falls below a predetermined limit value, the amount of extracted air is reduced, since excessive pressure differences between region 20 and the environment lead to excessive air flows and impair the spinning safety.

Based on this basic constellation, the system can be extended by further spinnerets, as shown by way of example in FIG. Thus, in Figure 2, in addition to the second spinning head 5, a third spinner head 32 with a third spinneret 33, to which a third Spinnfilamentraum 34 connects, provided. Between the second spin filament chamber 12 and the third filament filament space 34 there is a region 35 corresponding to the region 20. In such an extension around a third spinner head 32, the second blowing device 26 is arranged in the region 35 and provided with a further blowing outlet, which, with respect to the horizontal 28 inclined downwards by an angle α, is directed to the third spinning filament space 34 and there a cooling gas flow 36 corresponding to the flows 29, 30 generated.

With respect to the third spinning filament space 34 opposite the blowing device 26, a further suction device 21 is arranged, which sucks the flow generated by the second blowing device in the third spinning filament space 34. The design of this suction device substantially corresponds to the configuration of the suction device in the region 20, except that the openings 23, 31 are not necessary, since there is no spinning filament space on this side of the suction device.

Finally, as shown in FIG. 2, deflecting means 19a, 19b and 19c are arranged in the precipitation bath 13, which deflect the spinning filaments 9 out of the spinnerets 6, 7, 33 as a substantially flat filament curtain to the outside of the precipitation bath 13 and, as indicated by arrow 38 is indicated to perform further processing steps 37. Also in the embodiment of FIG. 2, the deflection means are arranged so that the center axis of the spider filament from the spinnerets 6, 7 points vertically into the precipitation bath 13 and the spider filaments 9 dive symmetrically into the precipitation bath 13. In the embodiment of FIG. 2, the area of the suction device 21 submerged in the precipitation bath 13 dips into the precipitation bath surface 15 at an acute angle, so that waves on the precipitation bath surface are not reflected.

FIG. 3 shows a third exemplary embodiment of the invention in a schematic side view, wherein in the following only the differences from the second exemplary embodiment of FIG. 2 will be discussed. For elements of the third embodiment whose structure or function corresponds to elements of the second embodiment, the same reference numerals will be used in the following.

The embodiment of Figure 3 shows the embodiment of Figure 2, which is extended by a larger number of other spinning heads, which are schematically indicated in Figure 3 by the reference numeral 38. In this way, a spinneret field is formed, in which the spinnerets are arranged side by side in several rows. Overall, the device 1 of Figure 3 has an even number of spinnerets. The spinneret 39 located at the end of the spinneret field opposite the first spinneret 4 is hereinafter referred to as the fourth spinneret, because regardless of the number of spinneret 38 located between the fourth spinneret 39 and the third spinneret 33, the same point-like structure always results. The fourth spinneret 39 is assigned a fourth spinning filament space 40, which extends in the extrusion direction from the extrusion openings (not shown in FIG. 3) of the fourth spinneret 39. During operation of the device 1, the fourth spinning filament space 40 ends at the precipitation bath surface 15.

As can be seen from FIG. 3, any desired number of spinnerets can be arranged side by side with the structure according to the invention, wherein in the areas between the spinneret dreams, in each case, fan devices, namely alternately a blowing device 25 and a suction device 21, are arranged. The blowing means 26 arranged between two adjacent spinning-film spaces thereby generate two separate gas-flow streams which are respectively directed towards the two adjacent spinning-film dreams. By this arrangement, a directional and stable flow of each spinning filament space is made possible. From the preceding embodiments, modifications are possible within the technical teaching of the invention. Thus, the suction device 21 does not have to dip into the precipitation bath 13, if other means for flow calming and surface calming are already provided in the precipitation bath. On the other hand, the blowing devices 25, 26 can also protrude into the precipitation bath and thus contribute to the calming of the precipitation bath surface.

Incidentally, the same advantageous design options apply to the blowing devices 26 arranged between two adjacent spinning film spaces as for the suction device 21. Namely, the blowing device 26 extends over at least one third of the height of its associated region between two adjacent spun-film dreams and, in a further embodiment, over at least half the width of this area, flows in the area can be effectively suppressed. Likewise, in the case of a blowing device projecting into the precipitation bath 13, surface waves on the surface 15 can be broken or swallowed by corresponding shaping.

Claims

claims

1. Device (1) for the extrusion of spun filaments (9) from a spinning solution containing water, cellulose and tertiary amine oxide, with a first spinneret (6) having a plurality of extrusion openings (8), with a first Spinnfila- ment space (11 ), which directly adjoins the extrusion openings in the opening direction of the extrusion openings, and with at least one blower device (21, 25, 26), by means of which a forced flow of gas material through the first spin fi lament space (11) can be generated, characterized in that beside the first spinneret (6) is provided with a second spinneret (7) with a second spider filament space (12) spaced apart from the first, and the fan means (21) for exhausting gas from the second spider filament space at least in sections between the first and second spider filaments arranged and by the fan means a forced flow of gas through the second spinning filament space (1 2) can be generated.

2. Device (1) according to claim 1, characterized in that the blower device (21, 25, 26) comprises a suction device (21).

3. Device (1) according to claim 2, characterized in that the suction device (21) at least a first, the first spinning filament space (11) facing the suction opening (22) and at least a second, the second spinning filament space (12) facing the suction opening (23). having.

4. Device (1) according to claim 2 or 3, characterized in that the extrusion openings (8) of the first and the second spinneret (6, 7) are each arranged on an elongated base and the respective longer side of the bases of first and second Spinneret (6, 7) face each other.

5. Device (1) according to claim 4, characterized in that the base surface is designed substantially rectangular.

6. Device (1) according to one of the above claims, characterized in that the suction device (21) in area (20) between the Spinnfila- menträumen (11, 12) is designed substantially tubular, wherein at least one of the suction openings ( 22, 23, 31) is located in the pipe wall.

7. Device (1) according to one of the above claims, characterized in that a blowing means (25, 26) for generating a directed on the first spinning filament space (11) gas stream (27) is provided, wherein the first spinning filament space (11) between the blowing device (25, 26) and the suction device (21) is arranged.

8. Device (1) according to one of the above claims, characterized in that a blowing means (25, 26) for generating a second spinning filament space (12) directed gas stream (27) is provided, wherein the second spinning filament space (12) between the blowing device (25, 26) and the

Suction device (21) is arranged.

9. Device (1) according to one of the above claims, characterized in that a third and fourth spinneret (33, 39) with a third and fourth spinning filament space (34, 40) and a suction device (21) between the third and the fourth Spiderfilamentraum is provided, wherein the third and fourth spinneret adjacent to the first and second spinneret (6, 7) is arranged and between the second and third spinneret (7, 33) a blowing means (26) for generating one on the second and the third Spinnfilamentraum directed gas stream (27) is located.

10. Device (1) according to any one of the above claims, characterized in that at least three spinnerets (6, 7, 33), each with a spinneret associated spinning filament space (11, 12, 34) are arranged side by side and in the area between the spider films dreams (11, 12, 34) alternately a suction device (21) and a blowing means (26) is provided.

11. Device (1) according to claim 10, characterized in that in each case between two spun-film dreams (11, 12, 34, 40) lying suction device (21) suction openings (22, 23) are integrated, which face the two spider filament dreams ,

12. Device (1) according to claim 10 or 11, characterized in that in each one between two spinning film dreams (11, 12, 34, 40) blowing means (26) first, on the one spinning filament space (11, 33) directed and second, on the other spinning filament space (12, 40) directed exhaust openings are integrated.

13. Device (1) according to one of the above claims, characterized in that a Fällbadbehälter (14) is provided, which is filled in operation with a precipitation bath (13), wherein the spinning filament space (11, 12, 34, 40) a spinneret (6, 7, 33, 39) in each case extends from the spinneret to the surface (15) of the Fällbadflüssigkeit (13) and the at least one suction device (21) is immersed in the region between the Spinnfilamenträumen at least partially into the Fällbadflüssigkeit.

14. Device (1) according to one of the above claims, characterized marked, that a Fällbadbehälter (14) is provided, which in operation with a precipitation bath

(13) is filled, wherein the spinning filament space (11, 12, 34, 40) of a spinneret (6, 7, 33, 39) each extending from the spinneret to the surface (15) of the precipitation bath (13) and at least one blowing device (25, 26) is at least partially immersed in the Fällbadeinrichtung.

15. Device (1) according to one of the above claims, characterized in that the blowing means (25, 26) or the suction device (15) measured over at least a quarter of the height of the region (20) between two adjacent spider filament dreams, in the extrusion direction , extends.

16. Device (1) according to any one of the above claims, characterized in that the blowing means (25, 26) and / or the suction device (21) over at least half the distance between two adjacent Spinnfi- lamenxträumen extends

17. Lyocell method in which spinning filaments (2) from a spinning solution containing water, cellulose and tertiary amine oxide by at least two juxtaposed spinnerets (6, 7, 33, 39) extruded and by at least two each subsequent to the two spinnerets Spinnfilamenträume (11, 12, 34, 40), wherein in the region (20) between the at least two spinning film dreams (11, 12, 34, 40) a forced flow of gas through the at least two spider film dreams (11, 12, 34 , 40) is generated.

18. Lyocell method according to claim 17, wherein in the region (20) also the at least two spinning film dreams (11, 12, 34, 40), the gas is sucked off.

19. Lyocell method according to claim 17 or 18, wherein at least 0.3 liters of gas per extruded gram spinning solution between the two spun-film dreams (11, 12, 34, 40) is sucked off.

20. Lyocell method according to claim 19, wherein at least 0.5 to 0.9 liters of gas per extruded gram spinning solution between the two spider films dreams (11, 12, 34, 40) is sucked off.

21. Lyocell method according to claim 20, wherein at least 0.9 to 2 liters of gas per extruded gram spinning solution between the two spun-film dreams (11, 12, 34, 40) is sucked off.

22. Lyocell method according to claim 21, wherein the extracted amount of gas is not less than 2 liters per extruded gram spinning solution of a spinneret (6, 7, 33, 39).