JP2006104600A - Method for producing synthetic fiber multifilament yarn and production apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing multifilament yarn, which method exerts remarkable effect for uniformly and efficiently cooling all ejected linear polymers, and to provide a production apparatus therefor. <P>SOLUTION: The method for producing synthetic fiber multifilament yarn comprises following (A) to (D). (A) Many linear polymers are ejected from many spinning holes set on the peripheral region surrounding the central region of a spinneret surface, (B) a cooling air blowing element extending in the ejecting direction of the linear polymers is set at the down flow region just below the central region of the spinneret surface to blow cooling air in the peripheral direction from the cooling air blowing element so that the cooling air blows the ejected linear polymers to cool the linear polymers, (C) the cooling air blown to the linear polymers and passed between the linear polymers is sucked in a peripheral region surrounding the passing region of the linear polymers with a suction mechanism set to extend in the ejecting direction of the linear polymers, and (D) the cooled linear polymers are drawn. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method and an apparatus for manufacturing a synthetic fiber multifilament yarn.

  When spinning a synthetic fiber multifilament yarn with a melt spinning device, the linear polymer discharged from the melt spinneret is cooled and taken up by performing necessary treatments such as application of oil and stretching.

  In general, this cooling is performed by blowing a stream of air at a predetermined temperature directly onto the linear polymer immediately below the melt spinneret, and conventional general cooling is performed around the linear polymer group discharged from the melt spinneret. In order to stabilize the air flow and to make the environment independent for each spinneret, it is performed in a cylindrical passage called a spinning tube.

  This cooling method is a major factor that influences the physical properties and quality of the resulting synthetic fiber multifilament yarn. Therefore, the speed of melt spinning is significantly increased, the number of filaments is increased to multifilaments, irregular cross sections, and ultrafine fibers. Technical studies have been carried out along with technological progress such as conversion (Patent Document 1, Patent Document 2). The focus of such conventional technical studies is the realization of homogeneous, stable and efficient cooling, and various studies are currently underway, such as the structure of the spinning cylinder and the arrangement and arrangement of the nozzle outlets. .

  Under such circumstances, there is a method in which the spinning holes are arranged in an annular shape on the spinneret, and cooling is performed by blowing cooling air from the center side of the filament group discharged in an annular shape toward the outer peripheral side. It has been proposed (Patent Documents 3-6). In this method, the possibility that the cooling air can be reliably applied to each filament is considered to be greater than the method in which the cooling air is blown from the outer peripheral side toward the center side. It is what In other words, it is considered that the cooling air sent from the center side to the outer periphery side is a direction in which the filament group is expanded, so there is no overlapping of the filaments, and more reliable and uniform cooling is possible than the opposite case. is there.

In particular, in the case of a group of ultrafine filaments, the number of filaments generally increases and the cross-sectional area of each filament is small, so that it can be cooled more instantly. It is desired to achieve uniform cooling by instantly applying a more reliable and uniform cooling action to all filaments. For example, in Patent Document 3, the distance between the spinneret and the cooling unit is related to cooling of ultrafine filament yarns in which the number density of spinning holes can be up to 40 holes / cm ² and the single fiber fineness is 0.8 dtex or less. The proposal about how to find

  FIG. 4 is thus configured by arranging the spinning holes in an annular shape on the spinneret, and performing cooling by blowing cooling air from the center side of the filament group discharged in an annular shape toward the outer peripheral side. It is the side schematic model figure which showed the schematic model of the conventional system.

  In the figure, 1 is a melt spinning machine, 2 is a melt spinneret, 3 is a linear polymer, 4 is a supply port for cooling air, 5 is a cooling air blowing member, 6 is an oil supply guide or guide, 7 is an oil supply guide, Oiling roll or focusing guide.

  As can be seen from FIG. 4, in this system, the yarn path is firmly fixed by using 6 oiling guides or guides having a saddle-like structure, and linear polymers are overlapped by the action of cooling air. It is less likely to oscillate and allows more stable and efficient cooling than a method in which cooling air is blown from the outer peripheral side toward the center.

That is, in the method in which cooling air is blown from the outer peripheral side toward the center portion side, there is generally no yarn path fixing member, and the linear polymers may overlap or swing, which is accurate and efficient. In some cases, cooling was not possible.
JP-A-5-195307 JP 7-278940 A Japanese Patent Publication No. 7-18047 JP-A-6-158414 Japanese Patent Laid-Open No. 11-350238 JP 2004-84134 A

  The object of the present invention is to provide a more uniform and efficient cooling with respect to the total number of linear polymers in the embodiment of the melt spinning machine in which cooling air is sent from the center side to the outer peripheral side as described above for cooling. It is an object of the present invention to provide a manufacturing method and a manufacturing apparatus for synthetic fiber multifilament yarn that exhibits remarkable effects.

The method for producing a synthetic fiber multifilament yarn of the present invention that achieves the above-mentioned object comprises the following configuration (1).
(1) A synthetic fiber multifilament yarn production method comprising spinning a synthetic fiber multifilament yarn by a melt spinning process having at least the following (A) to (D):
(A) A large number of linear polymers are discharged from a large number of spinning holes arranged in the outer peripheral region surrounding the central region of the base surface.
(B) In the downstream area immediately below the central region of the base surface, a cooling air blowing member extending in the discharge direction of the linear polymer is provided, and cooling air is blown from the cooling air blowing member toward the outer peripheral side. Applying to the discharged linear polymer, cooling the linear polymer.
(C) The cooling air blown to the linear polymer and passed between the linear polymers is provided so as to extend in the discharge direction of the linear polymer in the outer peripheral region surrounding the linear polymer passage region. Suction with a suction mechanism.
(D) Taking up the cooled linear polymer.

Furthermore, in the method for producing a synthetic fiber multifilament yarn of the present invention, more preferably, the following specific structures (2) to (6) are provided.
(2) The method for producing a synthetic fiber multifilament yarn according to the above (1), wherein the step of drawing the cooled linear polymer is a drawing speed of 2000 m / min to 6000 m / min.
(3) The method for producing a synthetic fiber multifilament yarn according to the above (1) or (2), wherein the number of linear polymers is from 100 to 500.
(4) The above-mentioned (1), (2) or (3) characterized in that the cooling air blowing area length and the suction area length of the suction mechanism are substantially equal in the running direction of the linear polymer. ) A process for producing a synthetic fiber multifilament yarn as described.
(5) The synthetic fiber multifilament yarn according to (1), (2), (3) or (4) above, wherein the synthetic fiber multifilament yarn comprises a filament having a single fiber fineness of 1.1 dtex or less. Production method.
(6) The above-mentioned (1), wherein the cooling air is blown by blowing an air flow having a set temperature of 15 to 25 ° C. at a cooling part length of 200 to 1000 mm and a flow rate of 15 to 60 m / min. (2), (3), (4) or (5) The method for producing a synthetic multifilament yarn according to (5).

Moreover, the synthetic fiber multifilament yarn manufacturing apparatus of the present invention that achieves the above-mentioned object has the following configuration (7).
(7) An apparatus for producing a synthetic fiber multifilament yarn, wherein the synthetic fiber multifilament yarn is spun by a melt spinning process having at least the following elements (E) to (H).
(E) An element that discharges a large number of linear polymers from a large number of spinning holes arranged in an outer peripheral region surrounding the central region of the die surface.
(F) A cooling air blowing member extending in the discharge direction of the linear polymer is provided in a downstream region immediately below the central region of the base surface, and cooling air is blown out from the cooling air blowing member toward the outer peripheral side. An element that cools the linear polymer against the discharged linear polymer.
(G) The cooling air blown to the linear polymer and passed between the linear polymers is provided so as to extend in the discharge direction of the linear polymer in the outer peripheral region surrounding the linear polymer passage region. The element that is sucked by the suction mechanism.
(H) An element that takes up the cooled linear polymer.

Furthermore, the synthetic fiber multifilament yarn manufacturing apparatus of the present invention preferably has the following specific configurations (8) to (11).
(8) The apparatus for producing a synthetic fiber multifilament yarn according to (7) above, wherein the step of drawing the cooled linear polymer is a drawing speed of 2000 m / min to 6000 m / min.
(9) The apparatus for producing a synthetic fiber multifilament yarn according to the above (7) or (8), wherein the number of spinning holes is from 100 to 500.
(10) The above-mentioned (7), (8) or (9), characterized in that in the running direction of the linear polymer, the blowing area length of the cooling air and the suction area length of the suction mechanism are substantially equal. ) The synthetic fiber multifilament yarn manufacturing apparatus as described.
(11) The synthetic fiber multifilament yarn manufacturing apparatus according to the above (7), (8), (9) or (10) is provided in a plurality, adjacent to each other to form a production line Synthetic fiber multifilament yarn manufacturing equipment.

  According to the first aspect of the present invention, in the aspect of the melt spinning machine that performs cooling by sending cooling air from the center side toward the outer peripheral side, it can cool more uniformly and efficiently with respect to the total number of linear polymers. A method for producing a synthetic fiber multifilament yarn exhibiting a remarkable effect on the above is provided.

  According to the invention of claim 6, in the aspect of the melt spinning machine that performs cooling by sending cooling air from the center side toward the outer peripheral side, it is possible to cool more uniformly and efficiently with respect to the total number of linear polymers. An apparatus for producing a synthetic fiber multifilament yarn that exhibits a remarkable effect is provided.

  According to the present invention, since it is possible to cool more uniformly and efficiently with respect to the total number of linear polymers discharged from the die, an ultrafine wire such as a high spinning speed and 1.1 decitex or less is used. Even in the case of a polymer, it has an effect that all the filaments can be uniformly and uniformly cooled at high speed.

  In particular, the ultra-fine linear polymer discharged at high speed is cooled instantly because it is thinner, and efficient cooling can be performed in a short time on a larger number of linear polymers. There is a requirement for a number of linear polymers, and the method and apparatus of the present invention satisfies this requirement.

  Hereinafter, the manufacturing method and manufacturing apparatus of the synthetic fiber multifilament yarn of the present invention will be described in more detail.

The synthetic fiber multifilament yarn production method of the present invention is characterized in that the synthetic fiber multifilament yarn is spun by a melt spinning process having at least the following (A) to (D).
(A) A large number of linear polymers are discharged from a large number of spinning holes arranged in the outer peripheral region surrounding the central region of the base surface.
(B) In the downstream region immediately below the central region of the base surface, a cooling air blowing member extending in the discharge direction of the linear polymer is provided, and cooling air is blown out toward the outer peripheral side from the cooling air blowing member. Applying to the discharged linear polymer, cooling the linear polymer.
(C) The cooling air blown to the linear polymer and passed between the linear polymers is provided so as to extend in the discharge direction of the linear polymer in the outer peripheral region surrounding the linear polymer passage region. Suction with a suction mechanism.
(D) Taking up the cooled linear polymer.

The synthetic fiber multifilament yarn manufacturing apparatus of the present invention is configured to spin a synthetic fiber multifilament yarn by a melt spinning process having at least the following elements (E) to (H). It is what.
(E) An element that discharges a large number of linear polymers from a large number of spinning holes arranged in an outer peripheral region surrounding the central region of the die surface.
(F) A cooling air blowing member extending in the discharge direction of the linear polymer is provided in a downstream region immediately below the central region of the base surface, and cooling air is blown out from the cooling air blowing member toward the outer peripheral side. An element that cools the linear polymer against the discharged linear polymer.
(G) The cooling air blown to the linear polymer and passed between the linear polymers is provided so as to extend in the discharge direction of the linear polymer in the outer peripheral region surrounding the linear polymer passage region. The element that is sucked by the suction mechanism.
(H) An element that takes up the cooled linear polymer.

  Such a synthetic fiber multifilament yarn production method and production apparatus of the present invention, as shown in FIGS. 1A and 1B, in addition to the conventional structure shown in FIG. The cooling air blown to the linear polymer and passed between the linear polymers is sucked by a suction mechanism 8 that extends in the discharge direction of the linear polymer in the outer peripheral region surrounding the linear polymer passage region. The feature is that it was made to suck.

  That is, FIG. 1 shows an example of the structure of the cooling air blowing part and the suction mechanism part directly under the base of the melt spinning machine used in the synthetic fiber manufacturing method of the present invention. FIG. 4B is a schematic model cross-sectional view showing the structure of the cooling air blowing part and the suction mechanism part.

  In the present invention, “a large number of spinning holes arranged in the outer peripheral region surrounding the central region of the base surface” means, for example, that the discharge surface of the melt spinning base is modeled in FIGS. 5 (a) and 5 (b). However, assuming that the region C that includes a central point of the die and occupies a fraction of the total area of the die is a “central region of the die surface”, a large number of spinning holes 13 are arranged in the outer peripheral region surrounding the region. The state that is.

  FIG. 5A shows an example in which a large number of spinning holes 13 are arranged in an annular shape having a double concentric circle, and FIG. 5B shows a case in which a large number of spinning holes 13 have a double concentric circle. An example is shown in which the presence of the spinning hole is divided in the part, and it is convenient to take up by dividing into two yarns after spinning.

  “Disposed in the outer peripheral region surrounding the central region of the base surface” does not necessarily have to have a complete annular shape or a circular shape, and corresponds to the central region, that is, the position where the cooling air blowing member is provided. It may be arranged around the outside of the region, for example, “U” shape, “U” shape, “=” shape with wide vertical spacing, “□” shape, or “△” shape. The shape may have a shape in which a central region is opened and a large number of spinning holes are present.

  According to the method and apparatus of the present invention, the cooling air blown from the cooling air blowing member is sucked by the suction mechanism 8 after the cooling air passes between the linear polymers. The air flow is formed as rectification, and a cooling action can be given more effectively and quickly to the linear polymer in which the yarn path is fixed by the six yarn guides.

  In the present invention, the temperature of the melt spinneret is preferably in the range of 280 to 300 ° C. for synthetic fiber filaments that are melt spun. The arrangement of the spinning holes on the base surface is not particularly limited, and as described above, it may be arranged in the outer peripheral area of the area corresponding to the position where the cooling air blowing member is provided. . FIGS. 5A and 5B are model diagrams showing a preferable arrangement example.

  The melt spinning apparatus of the present invention may constitute a production line by providing a plurality of units adjacent to each other. In that case, it is preferable that the distance between adjacent bases (the shortest distance between the central axes of two bases installed adjacent to each other) is within a range of 130 to 200 mm. If the suction mechanism is not used, the air flow may interfere, and thus the distance cannot be shortened. However, according to the method and apparatus using the suction mechanism of the present invention, the distance is This leads to shortening of the route of the molten polymer in the spinning machine, leading to improved productivity and improved yarn quality.

  The blowing speed of the cooling air (the speed at which the cooling air passes through the rectifying medium at the outermost part of the cooling air blowing member 5) is preferably in the range of about 15 to 60 m / min. It should be changed according to the total fineness of the spinning filament. In general, the larger the single fiber thickness and the larger the total fineness value of the spinning filament, the more the air volume needs to be increased, and the blowing speed should be increased.

  The cooling section length (effective blowing section length of the cooling air blowing member 5 parallel to the filament passing direction) is preferably in the range of about 200 to 1000 mm. This also includes the single fiber thickness, the total fineness of the spun filament, etc. In general, it is better to increase the length of the cooling section as the thickness of the single fiber is larger and the total fineness value of the spun filament is larger. However, according to the method and apparatus of the present invention, uniform cooling can be realized efficiently and at high speed, so that the length of the cooling section can be made shorter than that of the conventional type.

  The cooling start point distance (the distance from the die discharge surface to the upper end of the rectifying medium at the outermost part of the cooling air blowing member 5) is preferably within a range of about 10 to 150 mm. The thinner the thickness, the shorter the distance.

  The filtration accuracy of the rectifying medium is preferably in the range of 20 to 100 μm, more preferably in the range of 40 to 60 μm. As the type of the rectifying medium, it is preferable to use metal particles, a sintered body of metal fibers, a wire mesh, or a laminate of paper-like materials.

  Further, the suction speed of the suction mechanism 8 is preferably 0.8 to 1.2 times, more preferably 0.9 to 1.1 times the above-described cooling air blowing speed. It is preferable to use a punching metal or the like on the innermost side of the suction mechanism in addition to the above-described types of rectifying media of the cooling air blowing member 5 for rectification.

  In the method and apparatus for producing the synthetic fiber multifilament yarn of the present invention, the take-up speed in the step of taking the cooled linear polymer is preferably in the range of 2000 m / min to 6000 m / min. This is because, according to the present invention, an excellent cooling effect can be obtained even at a higher speed, so that it is possible to handle high-speed take-up. Further, the number of spinning holes is preferably 100 or more and 500 or less, that is, the number of filaments is preferably 100 or more and 500 or less.

  It is preferable that the cooling air length of the cooling air and the suction area length of the suction mechanism, which are parallel to the running direction of the linear polymer, are substantially equal.

  As described above, the present invention is suitable for producing a synthetic fiber filament having a finer fineness that can be cooled in a shorter time, and is optimal for producing a filament having a single fiber fineness of 1.1 dtex or less.

A production apparatus for carrying out the method for producing a synthetic fiber multifilament yarn of the present invention is configured to spin a synthetic fiber multifilament yarn by a melt spinning process having at least the following elements (E) to (H). Is.
(E) An element that discharges a large number of linear polymers from a large number of spinning holes arranged in an outer peripheral region surrounding the central region of the die surface.
(F) A cooling air blowing member extending in the discharge direction of the linear polymer is provided in a downstream region immediately below the central region of the base surface, and cooling air is blown out from the cooling air blowing member toward the outer peripheral side. An element that cools the linear polymer against the discharged linear polymer.
(G) The cooling air blown to the linear polymer and passed between the linear polymers is provided so as to extend in the discharge direction of the linear polymer in the outer peripheral region surrounding the linear polymer passage region. The element that is sucked by the suction mechanism.
(H) An element that takes up the cooled linear polymer.

  FIG. 2 is a schematic model diagram illustrating an example of a process until a synthetic fiber yarn manufactured by the synthetic fiber multifilament yarn manufacturing apparatus of the present invention is wound on a winder.

  FIG. 3 exemplifies a process example in the case where a multifilament yarn spun from one base is divided into two filament groups and taken up. In this case, the above-described many spinning holes 13 in FIG. 5B have double concentric circles, but it is preferable to use a structure in which the existence of the spinning holes is partially divided.

  It is preferable that a plurality of synthetic fiber manufacturing apparatuses of the present invention are provided adjacent to each other to form a production line series.

  As an embodiment of the method and apparatus of the present invention, the one shown in FIG. 1 is used as an example, the one shown in FIG. 4 is used as a comparative example, and the base shown in FIG. 5 (a) is used. Polyethylene terephthalate filament yarn (56 dtex) was manufactured, and the obtained fiber properties were evaluated and compared.

  The conditions common to the examples and comparative examples are as follows.

  That is, the polymer discharge rate is 18.6 g / min, the melting temperature is 295 ° C., the diameter of the base is 100 mm, the number of spinning holes is 144 (the number of filaments is 144), the spinning hole arrangement is a double circle, outer 65 mm, inner 55 mm, rectifying media The outer diameter is 37 mm, the length of the rectifying medium is 280 mm, the filtration accuracy of the rectifying medium is 40 μm, the cooling air discharge speed is 24 m, the cooling start point distance is 20 mm, and the take-up speed is 2500 m / min.

  In the embodiment of the present invention, in particular, a suction mechanism having an inner diameter of 89.9 mm, a suction medium length of 280 mm, and a suction speed of 24 m / min is used. In the comparative example, the suction mechanism itself does not exist. did.

  The results of evaluating and comparing each filament obtained in Examples and Comparative Examples are as shown in Table 1 below.

  As can be seen from Table 1, when the method and apparatus of the present invention are used, the Wooster half is changed from 0.6% to 0.3%, and unevenness in the longitudinal direction of the yarn can be suppressed. This is considered to be due to the fact that the cooling air flow in the passage region of the linear polymer is rectified by sucking the cooling air emitted from the cooling air blowing member by the suction mechanism, and the yarn fluctuation is suppressed.

  Therefore, according to the synthetic fiber manufacturing method and manufacturing apparatus of the present invention, it is possible to perform optimum cooling when the thin yarn is likely to sway, particularly when the single fiber fineness is 1.1 dtex or less. In the production of such thin yarns, the fact that the unevenness in the longitudinal direction of the yarns can be suppressed has a great industrial significance.

Further, according to the present invention, even when a plurality of melt spinning apparatuses are adjacent to each other to constitute a production line, the distance between the apparatuses can be shortened without interference of the cooling air flow between the adjacent apparatuses. It can be said that the method and apparatus are extremely excellent in that productivity can be improved. In addition, in this evaluation, the evaluation measurement method of each fiber physical property is as follows.
(1) Strength and elongation:
For the strength and elongation, a test yarn having a length of 50 mm cut out from a yarn (multifilament) produced using a general tensile tester was stretched to reach a break at a tensile speed of 400 mm / min. It is the acquired value, and the average value is obtained by setting n number to 5.
(2) Wooster Half:
It is a value obtained by measuring in a half mode while supplying a yarn at a speed of 100 m / min using a USTER TESTER MODELC manufactured by Zellweger, and an average value is obtained with an n number of 5.

FIG. 1 shows an example of the structure of a cooling air blowing portion and a suction mechanism portion directly under a base of a melt spinning machine used in the synthetic fiber manufacturing method of the present invention, and (a) shows a cooling air blowing portion. FIG. 4 is a schematic side view of the suction mechanism unit, and FIG. 5B is a schematic model cross-sectional view showing the structure of the cooling air blowing unit and the suction mechanism unit. FIG. 2 is a schematic model diagram illustrating an example of a process until a synthetic fiber yarn manufactured by the synthetic fiber multifilament yarn manufacturing apparatus of the present invention is wound on a winder. FIG. 3 exemplifies a process example in the case where a multifilament yarn spun from one base is divided into two filament groups and taken up. FIG. 4 shows a conventional structure in which the spinning holes are arranged in an annular shape on the spinneret, and cooling is performed by blowing cooling air from the center side to the outer peripheral side of the filament group discharged in an annular shape. It is the side schematic model figure which showed the schematic model of the system of this. FIGS. 5A and 5B are schematic views schematically showing an example of the structure of the discharge surface of the melt spinneret.

Explanation of symbols

1: Melt spinning machine 2: Melt spinneret 3: Linear polymer 4: Cooling blowing air supply port 5: Cooling air blowing member 6: Lubrication guide or guide 7: Lubrication guide, oiling roll or focusing guide 8: Suction mechanism 9: Entangling nozzle 10: first godet roller 11: second godet roller 12: winding device 13: spinning hole C: central region of the base

Claims (11)

A synthetic fiber multifilament yarn is produced by spinning a synthetic fiber multifilament yarn by a melt spinning process having at least the following (A) to (D):
(A) A large number of linear polymers are discharged from a large number of spinning holes arranged in the outer peripheral region surrounding the central region of the base surface.
(B) In the downstream region immediately below the central region of the base surface, a cooling air blowing member extending in the discharge direction of the linear polymer is provided, and cooling air is blown out toward the outer peripheral side from the cooling air blowing member. Applying to the discharged linear polymer, cooling the linear polymer.
(C) The cooling air blown to the linear polymer and passed between the linear polymers is provided so as to extend in the discharge direction of the linear polymer in the outer peripheral region surrounding the linear polymer passage region. Suction with a suction mechanism.
(D) Taking up the cooled linear polymer.   The method for producing a synthetic fiber multifilament yarn according to claim 1, wherein the step of drawing the cooled linear polymer is a drawing speed of 2000 m / min to 6000 m / min.   The number of linear polymers is 100 or more and 500 or less, The manufacturing method of the synthetic fiber multifilament yarn of Claim 1 or 2 characterized by the above-mentioned.   The synthetic fiber multifilament yarn according to claim 1, 2 or 3, wherein the cooling air blowing area length and the suction area length of the suction mechanism are substantially equal in the running direction of the linear polymer. Manufacturing method.   5. The method for producing a synthetic fiber multifilament yarn according to claim 1, wherein the synthetic fiber multifilament yarn comprises a filament having a single fiber fineness of 1.1 dtex or less.   The cooling air is blown by blowing an air flow having a set temperature of 15 to 25 ° C at a cooling part length of 200 to 1000 mm and a flow rate of 15 to 60 m / min. 4. A method for producing a synthetic fiber multifilament yarn according to 4 or 5. A synthetic fiber multifilament yarn manufacturing apparatus configured to spin a synthetic fiber multifilament yarn by a melt spinning process having at least the following elements (E) to (H):
(E) An element that discharges a large number of linear polymers from a large number of spinning holes arranged in an outer peripheral region surrounding the central region of the die surface.
(F) A cooling air blowing member extending in the discharge direction of the linear polymer is provided in a downstream region immediately below the central region of the base surface, and cooling air is blown out from the cooling air blowing member toward the outer peripheral side. An element that cools the linear polymer against the discharged linear polymer.
(G) The cooling air blown to the linear polymer and passed between the linear polymers is provided so as to extend in the discharge direction of the linear polymer in the outer peripheral region surrounding the linear polymer passage region. The element that is sucked by the suction mechanism.
(H) An element that takes up the cooled linear polymer.   The apparatus for producing a synthetic fiber multifilament yarn according to claim 7, wherein the step of drawing the cooled linear polymer is a drawing speed of 2000 m / min to 6000 m / min.   The apparatus for producing a synthetic fiber multifilament yarn according to claim 7 or 8, wherein the number of spinning holes is 100 or more and 500 or less.   The synthetic fiber multifilament yarn according to claim 7, 8 or 9, wherein in the running direction of the linear polymer, the blowing area length of the cooling air and the suction area length of the suction mechanism are substantially equal. Manufacturing equipment.   11. A synthetic fiber multifilament yarn production apparatus according to claim 7, wherein a plurality of synthetic fiber multifilament yarn production apparatuses are provided adjacent to each other to form a production line.

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