JP2018523029A - Method and apparatus for melt spinning synthetic yarn - Google Patents

Abstract

The present invention relates to a method and apparatus for melt spinning synthetic yarns comprising 50 to 400 microfilaments having a filament count in the range of 0.1 to 0.7 denier. The microfilament is extruded through a nozzle hole of a circular spinning nozzle and then guided through a first solidification zone having no active cooling action and a second solidification zone having an active cooling action. After cooling, the microfilaments are combined into one yarn at one convergence point. According to the present invention, the microfilaments, when extruded, range from 0.12 mm to 0.50 mm, in order to obtain a synergy between spin drawing and cooling, suitable for forming properties and filament cross-sections. From one open cross section of each nozzle hole with a diameter of. The microfilaments are then guided in the first solidification zone without active cooling over a minimum length of 50 mm and are actively cooled in the second solidification zone by cooling air flowing from the radially outer side to the inner side. The At this time, the microfilaments are collected into a yarn and then drawn out at a drawing speed in the range of 1400 m / min to 3000 m / min.

Description

  The present invention relates to a method for melt spinning a synthetic yarn according to the superordinate concept part of claim 1 and an apparatus for carrying out this method according to the superordinate concept part of claim 9.

  During the production of synthetic yarns, usually a plurality of fine filaments are first extruded using a spinning nozzle in a melt spinning process. At this time, the polymer melt is extruded under high pressure through a plurality of narrow nozzle holes of the spinning nozzle, thereby forming one filament for each nozzle hole. The filaments are grouped together after cooling and curing to form a single multifilament yarn. Particularly for use in woven and knitted materials, there is an increasing demand to form yarns from very thin filaments, ie so-called microfilaments. This makes it possible to produce a woven or knitted material that is extremely flexible, easy to bend, lightweight and resistant. However, in order to meet the requirements for use in the woven and knitting field, the microfilaments of the yarn must be produced with high uniformity in their physical properties and in their length quality. Based on the fineness, it is known that the microfilament coagulation, particularly immediately after extrusion, is particularly delicate. Attempts have therefore been made to perform the microfilament solidification as carefully as possible, forced by cooling air.

  In the method and apparatus for producing microfilaments with high count uniformity disclosed in DE 19821778 A1 (DE 19821778 A1), the microfilaments have no active cooling action after extrusion. It passes through a first solidification zone and a second solidification zone having an active cooling action. In the second solidification zone having an active cooling action, a cooling air flow is generated through a blowing candle arranged inside the filament group and blown from the inside in the radial direction to the outside. At this time, the filament curtain formed around the blow candle is spread. However, this spread directly returns to the first solidification zone, where the microfilaments are in a more or less melt-flowing state. Therefore, non-uniformity in forming the filament cross section cannot be avoided.

  Furthermore, it is necessary to divide the filament curtain around the blow candle at a single location in order to enable the supply of cooling air to the blow candle. This causes a portion of the filament to be displaced relatively strongly in the region between the spinning nozzle and the convergence point. However, these differences affect the so-called Spinnverzug, which is the basis for molecular orientation and cross-section formation of microfilaments. Such inhomogeneities in the formation of microfilaments, however, are disadvantageously pronounced by so-called color spots or stripes, especially when coloring in woven fabrics.

  Therefore, an object of the present invention is to improve the method and apparatus for melt spinning synthetic yarns of the type described in the superordinate concept section so that substantially uniform spinning drawing and cooling act on each of the microfilaments. It is to be.

  Another object of the present invention is to improve the method described in the superordinate conception section and the apparatus described in the superordinate conception section for melt spinning a synthetic yarn, in particular for use in the field of weaving and knitting. It is to provide a method and an apparatus capable of producing a synthetic yarn composed of microfilaments having a filament count in the range of 0.7 denier.

  This object is achieved according to the invention by a method with the features of claim 1 and an apparatus with the features of claim 9.

  Preferred developments of the invention are defined by the features and combinations of features of the dependent claims.

  The present invention takes into account that spinning drawing and cooling work together to form a uniform filament cross-section after extrusion. For example, it is generally known that increasing the extraction speed in relatively large nozzle holes increases the molecular pre-orientation. On the other hand as well, it is known that a delay in cooling under the spinning nozzle prevents rapid filament surface cooling and the pre-orientation caused thereby. Therefore, particularly when forming very thin microfilament cross-sections, it is necessary to coordinate cooling and spinning drawing. Therefore, in the method according to the present invention, the microfilament is advanced from each one opening cross section of the nozzle hole in the range of 0.12 mm to 0.50 mm and active over a minimum length of 50 mm in the first solidification zone. Guided without any cooling effect. Thereafter, in the second solidification zone, the cooling of the microfilament is performed by cooling air flowing from the outside in the radial direction toward the inside, and at this time, after the microfilament is collected into a yarn, 1400 m / min to 3000 m / min. Pull out at a drawing speed in the range of. At this time, the drawing speed is adjusted substantially according to the yarn type, that is, for example, whether it is desired to produce an undrawn yarn (POY) or a fully drawn yarn (FDY). The cooling air directed toward the filament from the outside to the inside does not cause the microfilament to expand or displace. This can result in a very stable microfilament hardening that acts uniformly on all filaments. The first solidification zone extended for a relatively long time provides sufficient peripheral wall hardening of the microfilament, thus enabling a stable entry into the solidification zone having a cooling action.

  In order to avoid too high advancing speeds during the extrusion of the microfilament, the microfilament is also extruded through the nozzle hole with a positive pressure of the melt in the range of 50 bar to 150 bar, at this time the nozzle hole Each open cross section extends over a length in the range of 0.4 mm to 1.5 mm. Preferably, a ratio of about 3 is desired between the length of the nozzle hole and the opening cross section of the nozzle hole.

  The extremely stable count uniformity of all the microfilaments inside the yarn has an influence especially on the high color uniformity. Thus, in a variant of the process according to the invention, preferably the melt is colored directly with a colorant or a colored masterbatch prior to extrusion. In this way, it is no longer necessary to color the microfilament later.

An active cooling action in a relatively short cooling zone of the solidification zone can be realized by the cooling air flowing radially from the surroundings inside the second solidification zone. To that end, the microfilament is actively cooled and guided through the second solidification zone over a length in the range of 150 mm to 250 mm. The cooling air consumption adjusted at this time is adjusted according to the number of microfilaments extruded at the same time. At this time, a very small number of microfilaments are cooled with a cooling air amount of about 35 Nm ³ / hour, The microfilament is cooled with a cooling air volume of about 120 Nm ³ / hour.

  The cooling air is then guided particularly gently towards the microfilament, for which, according to a preferred development of the method, the cooling air is air permeable to the screen cylinder surrounding the microfilament in order to actively cool the microfilament. The screen cylinder is arranged inside a pressure chamber filled with cooling air.

  At this time, the cooling air is introduced into the pressure chamber through the air-permeable bottom of the pressure chamber. In this way, a uniform pressure state is created in which a cooling air flow is blown onto the microfilament over the entire circumference of the screen cylinder.

  In association with the number of microfilaments extruded through the spinning nozzle and the resulting filament density, the microfilaments can be bundled into yarns at different intervals relative to the spinning nozzle. Preferably, the microfilaments are then grouped into yarns at intervals in the range of 400 mm to 1500 mm under the spinning nozzle.

  The method according to the invention is therefore particularly suitable for producing synthetic yarns, for example made of polyester or polyamide, with microfilaments.

  In a device according to the invention, which is particularly suitable for carrying out the method according to the invention, the nozzle holes have the same opening cross section in the range from 0.12 mm to 0.50 mm and the first solidification The zone has a minimum length of 50 mm and the cooling air blowing means is formed in a cylindrical shape so that the cooling air acts on the microfilament from the radially outer side to the inner side. When configured in this way, a relatively large number of microfilaments having substantially the same filament cross-section and the same physical properties can be produced in the same spin drawing.

  At this time, the nozzle holes preferably have the same length in the range of 0.4 mm to 1.5 mm. With this construction, the length-to-diameter ratio of the nozzle holes necessary and desired to form the extruded filament cross section can be maintained.

  In order to decouple passive and active cooling from each other, in a particularly advantageous development of the device according to the invention, the second solidification zone extends inside the breathable cylindrical wall of the cooling air blowing means. The cooling air blowing means has a cooling length in the range of 150 mm to 250 mm in order to guide the microfilament. When configured in this way, the cooling effect necessary for curing and solidification is obtained in the microfilament.

  In an embodiment that preferably provides a supply of cooling air for cooling the microfilament, the cooling air blowing means has a pressure chamber in which a screen cylinder with a breathable cylindrical wall is disposed. . With this arrangement, a uniform cooling air flow can be obtained over the length of the screen cylinder and across the cross section.

  At this time, the cooling air is preferably supplied through the open area of the cylindrical peripheral wall of the screen cylinder, and this open area is uniformly distributed over the cylindrical peripheral wall, and is 5% to the maximum of the total area of the cylindrical peripheral wall. It has a size in the range of 12%. If comprised in this way, the amount of cooling air can be kept correspondingly small, and it can be made to act on a microfilament uniformly.

  At this time, it has been found that the supply of cooling air through the air distribution chamber produces a particularly uniform flow. This air distribution chamber is arranged coaxially with respect to the pressure chamber and is connected to the pressure chamber via a breathable bottom. With such a configuration, it is necessary to change the cooling air flow a plurality of times before entering the inside of the screen cylinder. As a result, any turbulent flow during the supply of cooling air can be avoided.

  In order to obtain a first solidification zone that is as calm as possible, in a particularly preferred development of the device according to the invention, the first solidification zone is partly conically formed inside the cooling device. The peripheral wall ring has a free end directed to the circular spinning nozzle and covers the peripheral wall end of the cylindrical peripheral wall of the screen cylinder. The shaping of the peripheral ring allows a gentle transition between the first solidification zone and the second solidification zone. Further, the cover of the screen cylinder peripheral wall in the upper region of the screen cylinder prevents the volatile component from the first solidification zone from adhering to the cylinder peripheral wall. Thereby, especially in the case of a colored melt, the colorless colored particles generated during extrusion can be restrained in the first solidification zone.

  The device according to the invention for carrying out the method according to the invention stands out especially by gentle cooling in the second solidification zone.

  Next, a method according to the present invention will be described with reference to the accompanying drawings for an embodiment of an apparatus according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view schematically showing a first embodiment of an apparatus according to the present invention for melt spinning one synthetic yarn. It is a longitudinal cross-sectional view which shows roughly the cooling device shown by FIG. FIG. 3 is a cross-sectional view schematically showing the cooling device shown in FIG. 2. It is a longitudinal cross-sectional view which shows a part of nozzle plate of embodiment shown by FIG. 1 schematically. It is a longitudinal cross-sectional view which shows schematically another embodiment of the apparatus based on this invention which melt-spins a some synthetic yarn.

  FIG. 1 schematically shows a first embodiment of an apparatus according to the present invention for melt spinning a synthetic yarn in a longitudinal sectional view. This embodiment has a spinning device 1 and a cooling device 8 arranged one above the other in the vertical direction. The spinning device 1 comprises a heated spinning beam 2 in this embodiment, and this spinning beam 2 holds a circular spinning nozzle 3 below it. The circular spinning nozzle 3 is connected to a spinning pump 4 disposed above the spinning beam 2. The spinning pump 4 is connected via a melt supply path 5 to a melt forming machine (not shown) such as an extruder or a polycondensation facility. The spinning pump 4 is driven at an operating rotational speed by a pump driving device 29 and supplies the polymer melt to the circular spinning nozzle 3 under pressure. The device is therefore shown in the operating state in FIG.

  The circular spinning nozzle 3 held inside the spinning beam 2 has a nozzle plate 6 on the lower side, and the nozzle plate 6 has a plurality of nozzle holes.

  In order to describe the nozzle plate 6, reference is additionally made to FIG. In FIG. 4, the nozzle plate 6 of the circular spinning nozzle 3 is shown in a sectional view. On the lower side, a plurality of nozzle holes 7 are formed in the nozzle plate 6, and these nozzle holes 7 open directly to one melt passage 34 inside the nozzle plate 6. The nozzle hole 7 has a free flow cross section 38 characterized by a diameter indicated by the symbol d. The free flow cross section 38 in the nozzle hole 7 has a diameter d associated with the microfilament to be produced each time, in order to carry out the method according to the invention, from a minimum of 0.12 mm to a maximum of 0.50 mm. Yes. The opening cross section 38 then extends in the nozzle plate 6 over the length indicated by the symbol L in FIG. In order to maintain the ratio of the length L of the nozzle hole 7 to the opening cross section 38 of the nozzle hole 7 at 2.5 to 3.5, the length L of the nozzle hole 7 is set to the diameter d of the opening cross section 38. Related is limited. Due to the method according to the invention, the length L of the nozzle hole 7 is limited to a range of 0.4 mm to 1.5 mm. In this way, the flow rate of the melt during extrusion of the microfilament can be set within the range adapted to the drawing speed and thus the desired spinning drawing by the diameter d and the length L of the nozzle hole 7. At this time, the melt pressure existing inside the spinning nozzle serves as a control value in order to change the flow through.

  The nozzle plate 6 held under the circular spinning nozzle 3 has a minimum of 50 to a maximum of 400 nozzle holes 7 in relation to the desired number of microfilaments. The nozzle holes 7 are preferably formed uniformly distributed on the circular surface of the nozzle plate 6. However, when the number of nozzle holes 7 is relatively small, it is also possible to form the nozzle holes 7 in a ring shape on the nozzle plate 6.

  As can be seen from the drawing in FIG. 1, a cooling device 8 is connected directly under the spinning beam 2. The cooling device 8 is held under the spinning beam 2 with a sealing action. At this time, the first solidification zone 9 and the second solidification zone 10 are directly connected to the circular spinning nozzle 3. ing. The first solidification zone 9 is formed between the circular spinning nozzle 3 and the cooling air blowing means 11. There is no active cooling inside the first solidification zone 9.

  The cooling air blowing means 11 is arranged corresponding to the second solidification zone 10, and in this embodiment is formed by a screen cylinder 12 having a breathable cylindrical wall 13. Since the screen cylinder 12 is open at its end face, the filament group pushed through the circular spinning nozzle 3 can penetrate the screen cylinder 12. The screen cylinder 12 is disposed inside the pressure chamber 14, and the pressure chamber 14 is filled with cooling air. Cooling air is supplied through a breathable bottom 17 of the pressure chamber 14 via an air distribution chamber 15 disposed below the pressure chamber 14 in the vertical direction. The air distribution chamber 15 is connected to a cooling air source not shown here via an air connection passage 16. Inside the air distribution chamber 15, an outlet pipe piece 18 is disposed concentrically below the screen cylinder 12 and forms a yarn outlet 25.

  To further describe the function of the cooling device 8, reference is additionally made to FIGS. FIG. 2 shows the cooling device in a longitudinal sectional view, and FIG. 3 shows the cooling device in a transverse sectional view. Unless specifically referring to one of the drawings, the following description is for all drawings.

In order to keep the temperature adjustment of the circular spinning nozzle 3 inside the spinning beam 2 from being influenced as much as possible by the formation of the first solidification zone 9, a heat insulating plate 19 is provided below the spinning beam 2 in the form of circular spinning. The nozzle 3 is arranged concentrically. Accordingly, the circular spinning nozzle 3 is held while being shifted with respect to the lower surface of the spinning beam 2. A press plate 20 is connected to the heat insulating plate 19, and this press plate 20 is fixedly coupled to the spinning beam 2 in a general-purpose format. The pressing plate 20 cooperates with the seal member 21 held on the upper side of the pressure chamber 14. Therefore, the pressure chamber 14 is formed in a box shape. A screen cylinder 12 is arranged inside the pressure chamber 14, and this screen cylinder 12 completely penetrates the pressure chamber 14, and thereby on the upper side of the pressure chamber 14 and the lower side of the pressure chamber 14. Each has an opening for guiding the microfilament. A peripheral wall ring 22 is held at the upper end of the screen cylinder 12. The peripheral wall ring 22 has a free end portion 23 extending toward the nozzle plate 6 of the circular spinning nozzle 3 and a cover end portion 24 located on the opposite side extending to the inside of the screen cylinder 12 to cover the cover. Forming. Since the peripheral wall ring 22 is formed in a conical shape, a gentle transition between the circular spinning nozzle 3 having a relatively large diameter and the screen cylinder 12 is formed. Thereby, the peripheral ring 22 forms the lower end of the first solidification zone 9 in which the microfilaments are guided without cooling action immediately after extrusion through the nozzle plate 6. Is done. First coagulation zone 9 has a length indicated by reference numeral E ₁ in FIGS.

Within the first solidification zone 9, in particular the orientation of the molecular chain of the filament material is affected until it reaches precuring at the edge of the microfilament. For the process according to the present invention must at least 50mm minimum length E ₁ of is maintained. Within this minimum length, which can be expanded to a length of E ₁ = 75 mm, for example with a relatively large filament count of 0.5 den, the microfilament is guided through a sedative atmosphere. At this time, the change in the length E ₁ of the first solidification zone can be easily realized by exchanging the peripheral wall ring 22.

  A screen cylinder 12 is held inside the pressure chamber 14 in order to generate cooling air flowing from the radially outer side toward the inner side. The screen cylinder 12 has a gas permeable cylindrical wall 13, and the cylindrical wall 13 is preferably formed of a plurality of layers. The inner wall 39 facing the microfilament is preferably formed as a perforated sheet metal cylinder. In order to make the cooling air flowing from the pressure space of the pressure chamber 14 through the cylindrical wall 13 uniform, the outer wall 40 is formed, for example, as a wire woven fabric. At this time, the inner wall 39 and the outer wall 40 of the cylindrical wall 13 may be arranged at intervals.

  The amount of air blown through the screen cylinder 12 to cool the microfilament 30 is determined by the air permeability of the cylindrical wall 13 of the screen cylinder 12. For this purpose, the cylindrical wall 13 has a uniform open area over the cylindrical wall in the range of 5% to maximum 12% of the total area of the cylindrical peripheral wall. The open area of the cylindrical wall 13 can be determined by a hole in the inner wall 39, for example. The uniform distribution of the open area around the screen cylinder 12 makes it possible to supply the cooling air for cooling the microfilament in the radial direction over the circumference of the screen cylinder 12 and the length of the screen cylinder 12. At this time, the outflow speed of the cooling air is determined simply by the positive pressure generated in the pressure chamber 14. Since this positive pressure acts over the entire inner chamber of the pressure chamber 14, uniform spraying is performed from all sides to the microfilament.

As can be seen from the drawings of FIGS. 1 and 2, the screen cylinder 12 extends within the second solidification zone 10. Therefore, the second solidification zone 10 is a region in which the microfilament is actively cooled. Due to the high uniformity of spraying, a particularly uniform filament cross-section and thus high count uniformity is obtained. The length of the second coagulation zone 10 is indicated with E _2. Second coagulation zone 10, for implementing the method according to the present invention, has a length _{E 2} in the range of 150Mm～250mm. At this time, the number of microfilaments and the filament count are criteria for active cooling action.

  As can be seen from the drawing of FIG. 1, the microfilaments 30 are combined into a single thread 31. For this purpose, a collective yarn guide 26 is provided under the circular spinning nozzle 3, and this collective yarn guide 26 forms a so-called convergence point. Therefore, the collective yarn guide 26 is held at the center with respect to the circular spinning nozzle 3, whereby the microfilaments 30 are grouped into the yarn 31 at the convergence point. An interval between the spinning nozzle lower side of the circular spinning nozzle 3 and the collecting yarn guide 26 is indicated by a symbol k. In relation to the diameter of the circular spinning nozzle 3 and in relation to the number of microfilaments, this spacing k is a minimum of 400 mm and a maximum of 1500 mm. Particularly at this time, the transition zone between the second solidification zone and the convergence point is used to obtain a uniform cooling of the microfilament. At this time, ambient air works for uniform cooling.

  In connection with each melt spinning method, the filaments can be simultaneously wetted by the fluid to promote unity. At this time, the fluid can be applied to the microfilament by pins or rollers.

  Under the collecting yarn guide 26, a drawing godet 27 for accommodating the yarn 31 is arranged. The drawing godet 27 is driven at a preset peripheral speed via a godet driving device 28.1 so that the microfilament can be pulled out after extrusion and has been established to form the microfilament. Spin drawing can be obtained. To carry out the method, the drawing speed in the drawing godet 27 is adjusted in the range from 1400 m / min to 3000 m / min in relation to the yarn type. The drawing speed affects the spinning drawing and thus the molecular structure formed. In order to produce fully drawn yarns (FDY), therefore, a relatively low draw rate is adjusted, and in order to produce partially drawn yarns (POY), a relatively high draw rate is adjusted.

  The embodiment of the device according to the invention shown in FIG. 1 has a stretching godet 33 arranged downstream of the drawer godet 27, which is a separate second godet drive. It is connected to device 28.2. In the case where no further drawing godet is arranged downstream of the drawing godet 33, for example, an undrawn yarn (POY) can be produced. In this case, a relatively high drawing speed of about 2500 m / min is adjusted in the drawing godet 27. For the case where the drawing godet 33 is followed by another drawing godet to draw the yarn 31, the drawing speed is influenced, for example, by a circumference of 1500 m / min in order to influence the pre-orientation and drawability. Adjusted to speed.

  The apparatus shown in FIG. 1 for carrying out the process according to the invention for melt spinning synthetic yarns from a plurality of microfilaments is preferably used for extruding already colored polymer melts, for example made of polyester or polyamide Is done. At this time, the melt supplied via the melt source is colored, for example, by supplying the dye directly in an extruder or melt stream, or by combining the melt stream with a master batch (particulate colorant). Can do. However, the polymer melt thus colored has the disadvantage that some colored particles dissociate during extrusion and enter directly into the first solidification zone. However, it is achieved by the peripheral wall ring 22 that these free colored particles adhere to the periphery of the peripheral wall ring 22 and do not reach the second solidification zone. The apparatus according to the invention has therefore proved particularly advantageous for extruding colored melts to form microfilaments.

  During the extrusion of the microfilament, the melt is extruded through the nozzle holes 7 of the nozzle plate 6 with a melt pressure inside the spinning nozzle in the range of 50 bar to 150 bar. This gives a melt flow rate adapted to the respective drawing speed and the desired filament count of the microfilament. In this case, in order to obtain a filament count in the range of 0.3 to 0.7 denier, the nozzle plate 6 having the same opening diameter in which the nozzle hole 7 has a diameter in the range of 0.12 mm to 0.5 mm is used. The

  The microfilament then passes through a first coagulation zone having a minimum length of 50 mm. Here, in particular, pre-orientation and pre-curing of the edge layer of the microfilament is performed. The desired pre-orientation and cross-section formation is achieved by spin drawing as determined by draw speed and flow speed.

In order to cure the entire filament cross-section, the microfilament is guided through a second solidification zone and cooled by cooling air blown radially inward from the outside over a cooling length in the range of 150 mm to 250 mm. The The internal pressure of the cooling air in an open area and the pressure chamber 14 in the cylindrical wall 13 of the screen cylinder 12, inside microfilaments of the second coagulation zone, cooled by the cooling air amount in the range of 35 Nm ³ / time ~120Nm ³ / time Is set to be. In this case, the number of microfilaments is a reference for the amount of cooling air. For example, for a yarn called 200f384, a maximum amount of cooling air is required to uniformly cool all 384 filaments. The first number 200 in the yarn designation defines all yarn counts with 200 denier.

  After cooling, the microfilaments are gathered into the yarn 31 by the collecting yarn guide 26 and are accommodated by the drawing godet 27 at a peripheral speed in the range of 1400 m / min to 2000 m / min.

  The method according to the invention and the device according to the invention thus make it possible to produce all yarns of general purpose, for example yarns 30f72 or 60f128 or 100f192 or even yarns 200f384 for use in the field of weaving and knitting. Is suitable. At this time, the filament count is in the range of 0.1 to 0.7 denier, preferably in the range of 0.3 to 0.5 denier. At this time, a polymer melt made of polyester or polyamide is preferably extruded.

Polyester yarn (POY) produced by the method according to the present invention and the device according to the present invention, having 144 filaments and all counts of 70 denier and colored gray (POY) is a Worcester measuring device. (Uster) shows a high uniformity in the count of 0.7 U% in the normal inspection. The quality number calculated from the strength and residual elongation was 29.0. At this time, spinning nozzles having nozzle holes each having a diameter of 0.2 mm and an L / D ratio of 3.0 were used. The spinning nozzle was connected to a spinning pump in which the polymer melt was fed to the spinning nozzle under a spinning pressure of 60 bar. To cool the filament, the first solidification zone was adjusted to a length of 60 mm (E ₁ ) and the second solidification zone was adjusted to a length of 161 mm (E ₂ ). At a distance of 670 mm below the spinning nozzle, the filaments were bundled into yarn using oil. The yarn was partially drawn and wound at a drawing speed of 2700 m / min.

  In practice, it is usual for a plurality of yarns to be formed simultaneously within one spinning position. To that end, FIG. 5 shows an embodiment of the device according to the invention, which can carry out the method according to the invention. The embodiment shown in FIG. 5 shows one spinning device 1 and one cooling device 8 that form one yarn group from four yarns. At this time, the number of yarns is an example.

  In this embodiment, a single spinning beam 2 has four circular spinning nozzles 3 arranged side by side. These circular spinning nozzles 3 are connected to a multi-spinning pump (Mehrfachspinnpumpe) 4 through a distribution system 35. The spinning pump 4 is driven via a pump driving device 29. The spinning pump 4 is connected via a melt supply path 5 to an extruder not shown here. The cooling device 8 forms a first solidification zone 9 and a second solidification zone 10 below the spinning nozzle 3 for each circular spinning nozzle 3. The formation of the solidification zones 9, 10 under the spinning beam 2 is identical to the embodiment shown in FIG. 1 and will therefore be referred to here and will not be further described.

  At this time, the second solidification zone 10 is formed by a screen cylinder 12, which are all arranged together in one pressure chamber 14. Accordingly, the cooling air is supplied to the screen cylinder 12 from one pressure chamber 14 together. An air distribution chamber 15 is arranged corresponding to the bottom 17 of the pressure chamber 14, and the air distribution chamber 15 is connected to a cooling air source (not shown) via an air connection passage 16. Since the pressure chamber 14 and the air distribution chamber 15 are formed to be equal in size, a continuous cooling air flow is introduced into the upper pressure chamber 14 through the air-permeable bottom portion 17.

  Below the cooling device 8, a plurality of collective yarn guides 26 and a plurality of oil supply pins 36 are arranged in order to group the microfilaments 30 into one yarn 31. The microfilament is wetted through the oil supply pin 36.

  In order to be accommodated by the withdrawal godet 27, the yarns 31 are brought together via a yarn guide 37, whereby the yarns 31 can be guided around the withdrawal godet 27 in parallel with one another at the smallest possible thread pitch. The drawer godet 27 is directly driven by a godet driving device 28. Accordingly, all the yarns 31 of the yarn group are guided together around the draw godet 27.

  At this time, the function for extruding, cooling and pulling out the microfilament is the same as that of the embodiment shown in FIG. 1, so that further explanation will not be given here and reference will be made to the above description. . The method according to the invention and the device according to the invention are therefore particularly suitable for the simultaneous production of a plurality of yarns from extruded microfilaments.

Claims (16)

A method of melt spinning a synthetic yarn comprising 50 to 400 microfilaments having a filament count in the range of 0.1 to 0.7 denier, the microfilament being extruded through a nozzle hole of a circular spinning nozzle, The microfilament that has just been extruded is passed through a first solidification zone that has no active cooling action and a second solidification zone that has an active cooling action, and the microfilament is at one convergence point. In a method that combines them into a single thread,
The microfilament is advanced from each opening cross section of the nozzle hole with a diameter in the range of 0.12 mm to 0.50 mm when extruded, and the microfilament is 50 mm in the first solidification zone. The microfilament is actively cooled by cooling air flowing from radially outward to inward in the second solidification zone, and the microfilament is A method of melt spinning a synthetic yarn, characterized in that the synthetic yarn is drawn at a drawing speed in a range of 1400 m / min to 3000 m / min after being collected into the yarn.   The microfilament is extruded through the nozzle hole with a positive pressure of the melt in the range of 50 bar to 150 bar, wherein the opening cross section of the nozzle hole has a length in the range of 0.4 mm to 1.5 mm, respectively. The method of claim 1, extending across the length.   The method of claim 2, wherein the melt is colored with a colorant or a colored masterbatch prior to the extrusion.   The method according to any one of claims 1 to 3, wherein the microfilament is actively cooled and guided through the second solidification zone over a length in the range of 150 mm to 250 mm. Wherein the microfilaments, inside said second coagulation zone, at a cooling air amount in the range of 35 Nm ³ / time ~120Nm ³ / time, The method of claim 4.   A cooling air flow is generated through the breathable cylindrical peripheral wall of the screen cylinder that surrounds the microfilament to actively cool the microfilament, the screen cylinder being disposed inside a pressure chamber filled with cooling air. 6. The method according to claim 4 or 5, wherein:   The method of claim 6, wherein the cooling air is directed into the interior of the pressure chamber through a breathable bottom of the pressure chamber.   The method according to any one of claims 1 to 7, wherein the microfilaments are grouped into the yarn under the spinning nozzle with an interval in the range of 400 mm to 1500 mm. An apparatus for performing the method according to any one of claims 1 to 8, comprising:
A circular spinning nozzle (3) below the heated spinning beam (2), having a nozzle plate (6) with 50 to 400 nozzle holes (7) for extruding the microfilaments A circular spinning nozzle (3);
A cooling device (8) connected to the lower side of the spinning beam (2), wherein a first solidification zone (9) and a second solidification zone (10) are formed under the circular spinning nozzle (3). A cooling device (8), wherein cooling air blowing means (11) is arranged corresponding to the second solidification zone (10),
A collective yarn guide (26) arranged in the center under the circular spinning nozzle (3), which bundles the microfilaments into one yarn;
At least one driven drawer godet (27);
In an apparatus comprising:
The nozzle hole (7) has the same open cross section (38) with a diameter (d) in the range of 0.12 mm to 0.50 mm, the first solidification zone (9) being The cooling air blowing means (11) is formed in a cylindrical shape so that the cooling air acts on the microfilament from the radially outer side to the inner side. An apparatus characterized by being made.   10. A device according to claim 9, wherein the nozzle holes (7) have the same length (L) in the range of 0.4 mm to 1.5 mm. The second solidification zone (10) extends inside the breathable cylindrical wall (13) of the cooling air blowing means (11), and the cooling air blowing means (11) guides the microfilament. 11. The device according to claim 9, wherein the device has a cooling length (E ₂ ) in the range of 150 mm to 250 mm.   12. The cooling air blowing means (11) has a pressure chamber (14) in which a screen cylinder (12) with the breathable cylindrical wall (13) is arranged. apparatus.   The cylindrical wall (13) of the screen cylinder (12) has an open area in a range of 5% to a maximum of 12% of the total area of the cylindrical peripheral wall, evenly distributed over the cylindrical peripheral wall. The apparatus according to 11 or 12.   The cooling device (8) has an air distribution chamber (15) connected to a cooling source, and the air distribution chamber (15) is arranged coaxially with respect to the pressure chamber (14). 14. The device according to claim 12 or 13, wherein the device is connected to the pressure chamber (14) via a breathable bottom (17).   The first solidification zone (9) is formed in the cooling device (8) by a peripheral wall ring (22) partially formed in a conical shape, and the peripheral wall ring (22) is free. The device according to any one of claims 11 to 14, wherein an end is directed to the circular spinning nozzle (3) and covers a peripheral wall end of the cylindrical peripheral wall of the screen cylinder (12). .   The assembly yarn guide (26) is arranged under the nozzle plate (6) of the circular spinning nozzle (3) with an interval (k) in the range of 400 mm to 1500 mm. The device according to any one of the above.

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