CN101460666A - Spinning device for producing fine yarn by splitting method - Google Patents

Abstract

Spinning apparatus for producing fine yarns by splicing, comprising a plurality of spinneret nozzles which are arranged in a spinneret nozzle part and have spinneret orifices from which spinneret droplets exit as monofilaments and have a plurality of acceleration nozzles, in particular Laval nozzles, the cross section of which is reduced to widen only downstream of the smallest cross section, said Laval nozzles being provided with spinneret orifices so as to be equipped with means for feeding an air stream which surrounds the monofilaments and is accelerated by the acceleration nozzles. In at least a plurality of plate-shaped gas nozzle sections, funnel-shaped recesses are made into which the spinneret nozzles reach in order to form gas flow channels. The means for relative positioning of the gas nozzle part and the spinneret nozzle part relative to one another are arranged in such a way that the flow cross-section of the gas flow channel can be varied and the minimum cross-section of the acceleration nozzle can be adjusted relative to the spinning orifice.

Description

Spinning unit for the production of fine yarns by splitting

The invention relates to a spinning device for producing spun yarns by splitting according to the preamble of the main claim.

Fine yarns in the range below 1 micrometer (μm) can be produced by splitting a fiber-forming fluid stream as a melt, solution or generally as a liquid which essentially forms a solidification, as in DE 199 29 709 and DE 100 65 859. The mechanism of yarn formation differs substantially from all currently known spinning methods in which the spinning material is taken up from a spinning nozzle by means of a winding device to form a yarn, or in spinning In the case of the viscose method, a force is exerted on the yarn by means of an accompanying air flow, and in a special embodiment, in the so-called meltblown method, where the air sucking the yarn is heated to a temperature close to that of the spinning material during spinning Discharge next to the nozzle opening. The yarn speed thus reaches the speed of the winding, but is lower than the speed of the air or gas flow which sucks it. This applies to the average value of the yarn diameter, however, several individual "outlier observations" were found during the melt blown process, where finer diameters could be produced than are produced by the output and the maximum possible take-up speed, maximum air velocity , but still not in the targeted manner, as happened in the new method described above, also called the Nanoval method. The following effects are used here according to a new mechanism, only recently clarified from the fundamental laws of fluids, as described by L. Gerking in Chemical Fiber International 54 (2004) pp.261-262 and 56 (2006) pp.57-59: If Externally impinging on a melt yarn or generally fluid yarn or fluid film causes pressure to build up inside it, if the velocity on the sheath of the fluid jet is greater than the velocity inside it, and if this is the case or even more, then in The acceleration is greater after exiting the spinneret opening. It can be said that this is reverse flow (Hagen-Poiseuille) in pipes or channels, where the pressure energy is used to overcome the frictional action on the channel walls, and in the case of the new spinning method, the energy is obtained by acting from the outside The shear stress on it is transmitted to the yarn. The aforementioned yarns try to counteract this by increasing the pressure inside. If not only the sheath is cooled by the airflow surrounding it, the result may be solidification of the yarn.

In the case of polymers and polymer solutions with their substantially low thermal conductivity, however, at first only a sheath of increasing viscosity is formed and dynamic effects can act on the inside of the yarn. The result is thus a good regularity and reproducibility of bursting (Bursting) comparable to the bursting of a tube at its longitudinal engagement with a surprisingly substantially continuous yarn, and splitting indefinitely Characterized by a low spread across the yarn diameter. The total number of individual yarns thus produced from one liquid jet exceeds up to several hundred when producing particularly fine yarns (approximately or less than 1 μm).

The Nanoval process in its industrial application is carried out in rows of nozzles with a succession of orifices located above the gap. Gas, generally air, flows with constant acceleration on both sides of each row of nozzles to the narrowest cross-section of the gap after generation in a fan or compressor without special regulation (energy requirements substantially lower than in melt blowing) , the gap then generally widens again rapidly, but essentially has the configuration of a Laval nozzle. In addition, the individual circular nozzles are depicted as being surrounded by an annular gap which decreases in the direction of the narrowest cross section.

It has been shown that the shear force acting on all sides of the yarn by the rotationally symmetrical air flow results in a smaller average diameter of the substantially continuous yarn, which is produced by the splitting process and can be distributed more evenly of the impacted yarn, regardless of whether the air is additionally heated or not. In addition, the cooling interactively creates a bursting action with hydraulic pressure, said cooling being more evenly distributed around the yarn and Consume less air. In the case of several rows of nozzles, a portion of the air in the spaces between the yarns is poorly used.

Another influencing factor for the production of finer and even finer yarns is the output per spinning nozzle opening, regardless of whether the spinning material has circular or slotted holes, as mentioned above such as with electrospinning only Additional production is possible, but with a small production volume and high space and safety costs due to the high voltage required. The gas speed in the narrowest cross-section of the Laval nozzle can reach the speed of sound, thereafter it can reach the speed of sound, thereafter it even transforms into ultrasonic waves in the widened part, and then in the case of this flow is filled with yarn, generally quickly by compression shock cause infrasound. However, with a defined running surface of the still deformable yarn material, specific shape-changing operations can only be carried out by means of shear stress. Therefore, when producing very fine yarns in the range of about and below 1 μm, the yield is substantially lower. This leads to the fact that, for a given total output, more spinning nozzles are used over the width when producing nonwovens according to the Nanoval process for finer yarns. This applies correspondingly to the production of yarns.

The object of the present invention is to produce a device for the production of fine yarns, which are compact and simple in structure, for which a good initial spinning schedule is feasible.

This object is achieved according to the invention by combining the characterizing features of the main claim with the features of the preamble.

Advantageous developments and improvements are possible as a result of the features indicated in the subclaims.

Since the device actually used for the production of spun yarns has at least one spinning nozzle part and at least one partly plate-shaped gas nozzle part, said spinning nozzle part is equipped with several spinning nozzles, and said gas nozzle part has at least one The gas supply chamber, as a result, is at least partly a plate-shaped gas nozzle part with a plurality of funnel-shaped recesses as accelerating nozzles, into which the spinning nozzles are joined in such a way that a spinning nozzle/accelerating nozzle combination is formed, especially Laval Nozzles, the above combinations have rotationally symmetrical gas flow passages, and the device can be manufactured compactly with a large number of closely adjacent combinations, while the gas nozzle part and the spinning nozzle part can be displaced relative to each other, so that the gas nozzle part and the spinning nozzle part The air flow channels formed between the spinning nozzles can have different flow cross-sections, as a result of which the height of the spinning opening can be adjusted to the narrowest cross-section of the accelerating nozzle, especially the Laval nozzle. As a result, the spinning start is facilitated and it is possible for the first time to use a plurality of nozzles which are adjacent and consecutive in which the gas nozzle part is wound towards said spinning nozzle part relative to the spinning nozzle part so that Arriving yarn run is not damaged. At the same time, maintenance and cleaning of the spinning nozzle is facilitated as a result of the replaceability.

A particularly simple construction is provided if the gas chamber is formed between the underside of the spinning nozzle part and the upper side of the plate-shaped region of the gas nozzle part, the spinning nozzle or the spinning nozzle nozzle protruding into the above-mentioned spinning nozzle part. Outside the nozzle section, gas, usually air, is supplied to the accelerating nozzle through the aforementioned gas chamber.

It is particularly advantageous to provide a self-adjusting seal between the spinning nozzle part and the gas nozzle part, the sealing being compressed by the pressure then generated when gas is introduced during spinning.

An advantageous embodiment, although somewhat more complex and especially when supplying "cold" air, consists in shaping the gas nozzle part as a hollow body, which is joined by recesses with the hollow body between the recesses The cavity forms a gas chamber, the hollow body has an opening towards the spinning nozzle part, said opening preferably being rotationally symmetrical around a recess through which air or gas passes towards the accelerating nozzle.

Multiple nozzle sections and gas nozzle sections can be arranged adjacently, and different spinning materials can also be monofilamentally twisted.

Advantageously, a further plate with several openings can be arranged below the plate-shaped region of the gas nozzle part, forming at the same time a distribution chamber for another fluid. Such a fluid may be water for coagulation of the dissolved fiber material, coolant for freezing the molecular orientation obtained during splitting, means for heating such as steam for secondary stretching or similar.

The invention is illustrated in the drawings and explained in more detail in the ensuing description. show:

1 is a longitudinal sectional view corresponding to the section line D-D according to FIG. 2 through a first embodiment of a spinning device according to the invention,

Figure 2 is a cross-sectional view of the device according to the invention along the section line C-C of Figure 1,

3 is a sectional view of a part of the device corresponding to the section line A-A in FIG. 4 through a device according to a second embodiment of the invention, and

Figure 4 is a sectional view corresponding to the section line B-B of Figure 3 through the device according to the invention.

The spinning device represented in Figures 1 and 2 has a spinning nozzle part 28 in which a plurality of melt channels 14 are arranged, the above-mentioned melt channels being provided through a filter 25 and a perforated plate 26 for In the case of melts or solutions, the supplied melt or solution is purified. The melt channels continue into spinning nozzles or spinning nozzle sockets 23 , only three rows of spinning nozzle sockets 23 are shown here. A plurality of spinning nozzle connectors 23 can be arranged very perfectly one behind the other in the direction of progression of the arrow 50 .

The lower plate-shaped region of the spinning nozzle section is accommodated in a gas nozzle section 27 comprising a frame-like piping 34 and a plate-like section 35 in which three rows of respectively offset Laval nozzles 36 are arranged , the three rows of Laval nozzles 36 correspond to the rows of spinning nozzle pipe joints 23 . The piping portion 34 has an upstanding edge, and a seal 33 is arranged between this upstanding edge and a surface 32 of the lower region of the spinning nozzle portion 28, said surface 32 being located opposite said upstanding edge.

The spin nozzle and gas nozzle sections 28, 27 are aligned relative to each other so that the tip of the spin nozzle nipple 23 protrudes into the Laval nozzle 36, and a gas chamber 22 is formed between the lower surface of the spin nozzle section 28 and the gas nozzle section. Formed between the upper surface of the plate-shaped area 35 through which the spinning nozzle pipe joint 23 joins the gas chamber, and the plate-shaped area 35 is connected to the gas or air supply line 20 provided in the piping part superior.

In particular, if the supplied air is cold air, the spinning nozzle nipple 23 is preferably equipped with a heating mechanism 24, advantageously a belt-type heating mechanism, as is known from injection molding tools in plastic machine construction of.

The device according to the invention has means for displacing the spinning nozzle and the gas nozzle parts 28, 27 relative to each other, in this embodiment a screw 29 is introduced into a slotted nut 30 which firmly connected to the spinning nozzle part, and connected to the holder 31 in the holder 31 in the frame edge 34 of the gas nozzle part 27, and the holder 31 can apply pressure or tension according to the direction of rotation of the screw 29, its The result is a partial displacement of the gas nozzle. Of course, other types of displacement mechanisms are also feasible.

To start spinning, the gas nozzle part 27 is raised, ie displaced upwards in FIG. 1 , as a result of which the seal 33 is depressurized. If the gas 21 is supplied through the gas supply line 20 after reaching the relief pressure, the pressure on the seal 33 is increased by the pressure in the gas chamber 22 in addition to the downward displacement of the gas nozzle portion 27 . Thus, a specific automatic adjustment of the seals takes place when the melt or solution arrives and the Laval nozzle cross-section is loosened towards the respective spinning nozzle.

To clean the spinneret nozzle 23, the gas supply 21 is switched off and the gas nozzle section 27 is raised until the plate section 35 rests against the spinneret nozzle 23 with the wall of the Laval nozzle 35. The air present in the region of the seal 33 and the surface 32 is thus blown out. Nozzle fitting 23 protrudes from the Laval nozzle and can be purged.

The device shown in Figure 3 has a spinning nozzle section 1 with a series of raised portions or projections, preferably in the form of cones, which receive or form the spinning filaments. Nozzle 13. For example, the spinneret part may be shaped as a plate into which the spinneret 13 (same as that of Fig. 1) is inserted. The spinning nozzle has a melt or solution channel 14 , which terminates in the spinning nozzle opening 3 .

Furthermore, a gas nozzle part 2 is provided, which is shaped, for example, as a hollow body formed from two plates equipped with funnel-shaped recess formations.

Between the two plates, a cavity 9 is formed, which is interrupted by a funnel-shaped recess. The cavity 9 serves as a gas chamber, which in turn is connected to a gas supply. Around each funnel-shaped recess, an annular opening 4 is inserted, the opening 4 shown in sectional view in FIG. , each funnel-shaped concave portion is arranged closely adjacent to each other.

The conical elevation forming the spinning nozzle 13 engages in the recess of the gas nozzle part 2 in such a way that a rotationally symmetrical gas flow channel 5 is produced. In the embodiment shown, in the annular space between the spinning nozzles 13, respectively shown as recessed parts in FIG. To the spinning opening 3 , the surrounding space 9 forms the gas flow channel 5 between the surface forming the portion 11 and the surface of the recess in the portion 2 . The individual gas flow channel 5 is thus shaped in such a way that it tapers in the direction of the individual spinning opening 3 around which it engages the corresponding recess in a rotationally symmetrical manner. Accordingly, Laval nozzles are produced, the cross-section of which widens abruptly at the edge between the recess and the outer surface of the lower plate in FIG. 3 , however, the widening of the cross-section can also take place gradually.

The spinning nozzle part 1 and the gas nozzle part 2 are displaceable relative to each other in the vertical direction according to the illustration in FIG. 3 , which can be realized by means of slide bars, not shown. Thus, the height of the optimal part 6 of the Laval nozzle can be adjusted relative to the spinning opening 3, with the result that the start of spinning can also be facilitated.

These slide bars can simultaneously absorb the forces that occur in the case of different expansions of the spinning nozzle 1 and the gas nozzle 2 , as a result of which the positioning of the two components relative to one another is maintained.

In Fig. 4, a combination of two rows of spinning nozzles 13 and Laval nozzles is shown, the spinning nozzles 13 of one row being offset with respect to the spinning nozzles of the other row. Especially in the case of larger spinning beam widths, it is also possible to provide dedicated gas distribution channels between adjacent rows in order to supply the required amount of gas to the Laval nozzles.

The operating modes are arranged as follows.

In FIG. 3, the melt is supplied in part 1 and discharged in the spinning nozzle opening 3, while the gas, subsequently called air, flows out of the space 9 in part 2 after being discharged through the annular opening 4 towards the channel 5, which is relatively Rotationally symmetrical about the spinning nozzle opening 3, between the parts 1 and 2 towards the narrowest cross-section 6, and pre-clamps the exiting yarn 7 at the spinning opening 3 to accelerate it, i.e. reduce it diameter, and according to the Nanoval effect, so that it has been split into a brush-like strand in the Laval nozzle or shortly thereafter.

Although starting spinning with a row of nozzles is done simply by pushing together the two channel lobes forming the Laval nozzle, this is not possible in the case of combinations of rows of nozzles. The part 2 can however be displaced in the direction of the yarn discharge axis. As a result, when spinning starts in the direction of the forming part 11 , said forming part 11 can be retracted in its entirety, and the discharge of air through the opening 4 can start to stop or be allowed to a small extent. The part 2 is then lowered, the spinning is started, the yarn is pulled and split according to the known set data in the method described above for the air velocity of the pressure in the space 9 of the part 2, for making the spinning The material flows from the opening 3 and is at the temperature required for splitting the spinning material. The above-mentioned material is advantageously additionally heated just before being discharged from the spinning opening 3, said heating being indicated by a heating means 10, the introduction and installation of which have been omitted for the sake of clarity of the drawing. In order that the flowing air does not cool down at a temperature lower than the temperature of the spinning material, the forming part 11 is shaped such that it forms, on the one hand, the inner wall of the rotationally symmetrical channel 5 for accelerating the air until approaching the spinning nozzle opening 3, Furthermore, the separation of the spinning nozzle 13 by the air gap 12 prevents heating of the gas flow in the flow channel 5 . However, instead of the spinning nozzle part 1 , the forming part 11 can also contain the heating means of the spinning nozzle.

The two basic positions of the movable part 2 are indicated by dotted lines in Fig. 3 for starting the spinning process.

Figure 4 shows the horizontal section line B-B in Figure 3 as a cross-sectional view of a multi-row nozzle arrangement through two rows of nozzles, in order to show the supply of air from the outside to the individual spinning nozzles 13 for the purpose of removing the air from the space through the openings 4 9 feeds into channels 5 which each terminate at the smallest cross-section 6 .

In the case of greater air requirements, i.e. with larger nonwovens and thus spinning beam widths, the main distributor channels can be fitted between the nozzle openings with only the rows of individual nozzles facing slightly towards the nonwoven Cloth running direction moves apart, because spin nozzle arrangement according to the present invention has the same advantage as spinneret bar, simultaneously spinneret arrangement forms a plurality of continuous spinneret beams seen in the direction of nonwoven fabric . Statistical compensation for greater nonwoven uniformity can be made between the rows, as the yarns of the following rows continuously cover the sparse locations of the preceding rows.

If in addition a gaseous or air or liquid medium for accompanying the solution is desired for cooling or holding during spinning of said solution and also for coagulation of the yarn, this medium can easily be added as a third fluid flow at the spinning nozzle and Laval nozzle and form outflow. This is shown in FIG. 1 by a plate 37 which is provided with several openings 38 below the spinning nozzle nipple 23 and the Laval-shaped opening 36 respectively. Similar to the supply of air to the space 22 , a third fluid flow can be introduced at 39 according to arrow 40 into the space 41 formed between the plates 35 and 37 . From there the third fluid passes through the upper edge of the opening 38 into the yarn air flow. This can be done, for example, by adding yarn from Lyocell solution to the coagulation of the pulp. The size of the openings 38 and their position relative to the spin nozzle nozzle 23 can be easily adapted to the main yarn stream with ambient air. All three fluids thus flow downwards (in the figure).

The device is also basically suitable for spinning different spinning materials in the individual spinning nozzles, for which the distribution of the melt or spinning solution must be arranged accordingly, i.e. alternately arranged transversely with respect to the direction of travel or in different rows. Make different arrangements. It is therefore possible to produce hybrid nonwovens in order to achieve special effects, such as polyethylene as a binder yarn and polyester as a matrix for strength, or to use a part of the yarn with a greater shrinkage to deposit on the nonwoven. Greater volume and softness are obtained as a result of shrinkage of the entire narrow seam after application, and also other nonwoven properties are obtained by two or more different components. In addition, bicomponent or multicomponent yarns can be produced without difficulty by supplying two or more spinning materials into the spinning nozzle section and into the channels 14 . In the case of different throughputs, different types of hybrid nonwovens can be produced by adjusting the opening cross-section of spinning nozzle openings of different sizes or by controlling the supply of melt to the spinning nozzle.

The device also has the advantage that it actually connects the melt-guiding spinning nozzle section 1 or 28 to all alternatives but reliably relative to the cooler air nozzle section 2, 27 in the transverse direction. above the nozzle part 2,27. After heating part 1 with a heating mechanism (not shown here), if no particularly hot air is supplied from part 2, part 1 will expand more relative to part 2 so that the spinning holes 3 and the narrowest transverse Surface 6 shows deviations in width and length, respectively, as do portions 28 and 27 . The connection can be made via a slide bar (not shown) which prevents this deviation with respect to the force, said slide bar being able to be arranged in the gas nozzle between the spinning nozzle part 1 and the spinning nozzle/Laval nozzle combination part of the board. In order to prevent differential expansion, the gas flow in the flow channel 5 can also be deliberately heated.

Guiding of the spinning nozzle part 1 must be carried out by means of yarn guides or slide bars known in tool construction, said spinning nozzle part 1 being initially set back with respect to the spinning hole opening 3 which, during the running of the yarn, is Direction displacement, in order to produce splitting effect. The addition of air (also not shown here) takes place from the outside to the front, rear or side on the beam, requiring a seal between the spinning nozzle part 1 and the gas nozzle part 2, or due to the A guide length of a few millimeters between is sufficient, so the chamber 9 shown in FIG. 4 can also be fed by bellows at the spinning beam and the outer distribution chamber.

Spin beams of larger width can now be divided in a simple manner into nozzle zones which in turn comprise many individual spin nozzle/Laval nozzle combinations so that each individual package of these packages (spin packs) Replacement is possible in the event of clogged or otherwise disrupted spinneret openings. The separating gaps are then arranged diagonally with respect to the direction of travel, as shown in FIG. 4 , and are respectively arranged on the gaps of the preceding spinning nozzle openings.

The following examples demonstrate the use of the device in a split spinning process as described by Nanoval and the yarn values achieved, for example. The polypropylene melt was distributed over 19 spinnerets 13 arranged in a row with inlet holes for the melt 14 but with spinneret openings having a diameter of 0.3 mm. Behind each of these openings in the running direction of the yarn is located a Laval nozzle with a diameter of 3 mm in the narrowest cross-section, said openings leading back to the spinning opening after the start of spinning . Polymer throughput varied in the region as listed in Table 1, also in the region of shear stress on the yarn the air pressure and thus the flowing air velocity caused splitting. The temperature of the polypropylene melt can be heated by an electric heating element by about a further 20° in the spinning nozzle 13 shortly before it exits the spinning opening.

For the apparatus described in accordance with Figures 1, 2, the same method data did not yield significantly different results.

Table 1 Polypropylene (PP) Yarn Results MFI (Melt Flow Index) 28 Melt Index at 230°C and 2.16kg

m _o Polymer throughput per spinneret hole

T _s melt temperature

Δp _k The pressure of the air before it is accelerated in the Laval nozzle

T _L the air temperature at the same location

d ₅₀ Average yarn diameter of 20 individual measurements on a microscope screen

Statistical spread of yarn diameters produced by CV/d ₅₀ 100% coefficient of variation

d _min Minimum yarn diameter measured separately

Obviously, fine yarns down to about 0.5 μm = 500 can be produced not only at higher air pressures, i.e. at higher air speeds, at higher air temperatures and at lower throughputs. nanometers (mm), but this can also be achieved with a larger throughput of 3g/min and holes, for which the temperature of the melt is increased from 335°C to 352°C before it is discharged, at a higher 3.0g/min At throughput, the temperature at which the air was initially held was still within the range produced by compression and an increase at a constant value different from 180°C produced no measurable fluctuations in the direction of higher fineness. Then only the increase of air to 220°C yields a value of d ₅₀ =1 μm, while the smallest diameter measured microscopically is 0.44. However, yarn measurements as performed here with a microscope may no longer require high precision, since the range is already that of the wavelength of light. In any case, the definite relationship was initially unexpected from the point of view of conventional spinning processes. However, if we remember that here the yarn is produced by bursting, that is, by fragmentation, a different law from purely length-drawing is in the operations described above, which lead to practically individual Parameters may vary, eg melt temperature in relation to gas velocity with the same effect on final mean wire diameter and even its spread.

Although the device according to the present invention is primarily intended for the production of fine yarns, thicker yarns can also be monofilament-twisted with the device, as a result of which it demonstrates its versatility. Therefore, yarns made of polyester and polylactide, as listed in Tables 2 and 3, were produced. The diameter of the spinning nozzle opening was 1.0 mm.

Table 2 Yarn product polyester (PET) i.v=0.64 intrinsic viscosity (textile type)

When spinning polyester threads, it proves to be advantageous to wind the yarns after they have burst through the injector channel, which is set 1 meter lower, as in L. Gerking, Polymer Monofilament properties and changes in spinning lines, Chemical Fiber/Textile Industry 43/95 (1993), as described on page 874/875. By repeated heating in between, as described in column 4, lines 44-57 of DE 1965054, the tensile strength of the yarn can be increased in two measures but mainly shrinkage can be significantly reduced.

The values for the polymer polylactide produced from natural raw materials are shown in Table 3 for use in the split spinning process for coarser yarns.

Table 3 Yarn product polylactide (PLA) at 210 ° C and 2.16 kg MF (melt flow index) 22

In Table 3, the values characterized by (1) are formed from an otherwise detectable relationship, also as maximum values. In this adjustment, too, in the case of the value characterized by (2), the aerodynamic ratio is changed by changing the Laval nozzle geometry. In the case of (1), the splitting of the melt line never occurs, whereas in the case of (2), the above-mentioned splitting occurs occasionally.

The device according to the invention can be used for fibre-forming melts or solutions, but can generally also be used for liquids if it is eg a matter of coating thin layers such as colours, paints, finishers. The device thus serves to atomize the liquid into the finest possible droplets, which at the same time are distributed as evenly as possible on the surface to be painted. The conditions can be easily found in each case by means of the defined geometrical adjustment possibilities of the device.

According to Fig. 1, 2 or 3, the device described in 4 has following advantage in addition, and promptly melt or solution can than if this is carried out by film more easily and evenly distributes to each outflow port as usual with several rows of nozzle situations— Here's the spinning nozzle—up. The nonwovens produced are more evenly striated and are especially provided with lines of different weight in the direction of travel, which are also called "lanes".

Claims (15)

1. device for spinning, be used for producing fine yarn by division, spinning-nozzle with a plurality of outstanding bands spray silk openings, with have a plurality of acceleration nozzles, especially Laval nozzle, above-mentioned spray silk opening is arranged in the spinning-nozzle part, from spray silk opening, discharge as monofilament with spinning material, and above-mentioned Laval nozzle is assigned to spray silk opening, and its cross section reduces and broadens after minimum cross section, is provided for the mechanism of supply air flow, and described air-flow surrounds monofilament, and quicken by accelerating jet

It is characterized in that,

Accelerating jet is configured as funnel shaped recessed portion in the gas nozzle part (27) that to small part is plate shape, spinning-nozzle joins in the described infundibulate recessed portion and forms gas channel, and be provided for making gas nozzle part and the spinning-nozzle part mechanism of relative displacement relative to each other, so that change the flow cross-section of gas channel and/or can regulate the position in the minimum cross section of accelerating jet with respect to spraying the silk opening.

2. according to the described device for spinning of claim 1, it is characterized in that the mechanism that is used for relative displacement comprises thread-carrier and/or slide bar.

3. according to claim 1 or the described device for spinning of claim 2, it is characterized in that the mechanism that is used for relative displacement is configured as the adjustment screw device, described adjustment screw device is arranged between gas nozzle part and the spinning-nozzle part.

4. according to claim 1-3 this described device for spinning wherein, it is characterized in that, gas compartment with at least one gas supply is arranged between spinning-nozzle part and the gas nozzle segment, and above-mentioned air chamber is communicated with gas flow channel, and spinning-nozzle stretches in the described air chamber.

5. according to one of them described device for spinning of claim 1-4, it is characterized in that gas nozzle partly is equipped with frame shape rolling part, the zone with spinning-nozzle part of outstanding spinning-nozzle is inserted between the rolling part.

6. according to one of them described device for spinning of claim 1-5, it is characterized in that, between spinning-nozzle part and gas nozzle segment, be provided with one and regulate seal automatically.

7. according to one of them described device for spinning of claim 1-3, it is characterized in that, gas nozzle is partially-formed to be a hollow body, described hollow body is engaged by the infundibulate recessed portion, be provided with in the hollow body that forms air chamber the space and towards the opening of spinning part, described opening is connected to air chamber on the gas flow channel.

8. according to the described device for spinning of claim 7, it is characterized in that, shaped portion (11) correspondingly is inserted between the spinning-nozzle of spinning part, partly keep air gap (12) to be used for thermal insulation with respect to gas nozzle, above-mentioned air gap extends to the spinning opening basically, forms gas flow channel (5) between shaped portion (11) and gas nozzle segment (2).

9. according to claim 7 or 8 described device for spinning, it is characterized in that each opening (4) circularizes setting around the infundibulate recessed portion.

10. according to one of them described device for spinning of claim 1-9, it is characterized in that air chamber externally seals.

11. according to one of them described device for spinning of claim 1-10, it is characterized in that, gas nozzle part (2) and spinning-nozzle part (1) have a plurality of infundibulate recessed portions and spinning-nozzle, their adjacent one another are setting in a row, a row spinning-nozzle (13) and accelerating jet are provided with respect to another row's skew.

12., it is characterized in that the combination of gas nozzle part and spinning-nozzle part comprises a plurality of gas sections that can exchange respectively and spray nozzle part segmentation according to one of them described device for spinning of claim 1-11.

13., it is characterized in that a plurality of gas nozzles and spinning-nozzle (1,2) setting adjacent one another are according to one of them described device for spinning of claim 1-12.

14., it is characterized in that the distributor that is used for other fluid is arranged on gas nozzle and partly goes up outlet one determining deviation place apart from accelerating jet according to one of them described device for spinning of claim 1-13, above-mentioned fluid impact is from the yarn of monofilament division.

15. according to the described device for spinning of claim 14, for using in producing the lyocell yarn, other fluid is a water.

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