JP2006104601A - Method for producing synthetic fiber multifilament yarn and production apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing synthetic fiber multifilament yarn, which method causes no unevenness of yarn and uniformly cools all thready polymers, and to provide a production apparatus therefor. <P>SOLUTION: The method and apparatus for producing synthetic fiber multifilament yarn comprises (A) to (D). (A) Many thready polymers are ejected from many spinning holes set on the peripheral region surrounding the central region of the surface of a spinneret 2, (B) a cooling air blowing element 5 extending in the ejecting direction of the thready polymers is set at the down flow region just below the central region of the surface of the spinneret to blow cooling air in the peripheral direction from the cooling air blowing element so that the cooling air blows the ejected thready polymers to cool the thready polymers, (C) the cooling air blowing element is connected to the spinning hole-setting inner region of the spinneret 2, a cooling air flow path 12 is set inside the connecting part and cooling air is supplied from the cooling air flow path to the cooling air blowing element, and (D) the cooled thready 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.

However, in the system as shown in FIG. 4, it is usual to provide a cooling air supply pipe below the cooling device, so that the linear polymer contacts the supply pipe. In many cases, yarn unevenness occurs due to disturbance of the flow of cooling air around the outside of the cooling air supply pipe.
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

  An object of the present invention is to provide a cooling spinning machine that sends cooling air from the center side to the outer periphery side in view of the above-described points. On the other hand, the present invention is to provide a synthetic fiber multifilament yarn production method and production apparatus that exhibit a remarkable effect in cooling more uniformly and efficiently.

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 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 blowing member is connected to a spinning hole arrangement internal region of the die, and a cooling air flow path is provided in the connection portion, and the cooling air is supplied from the cooling air flow path to the cooling air blowing member. thing.
(D) Taking up the cooled linear polymer.

Moreover, the synthetic fiber multifilament yarn manufacturing apparatus of the present invention that achieves the above-mentioned object has the following configuration (2).
(2) 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 device is an element that is connected to the spin hole arrangement internal region of the die and forms a flow path for supplying cooling air inside the connection portion.
(H) An element that takes up the cooled linear polymer.

  According to the first aspect of the present invention, in the aspect of the melt spinning machine in which cooling air is sent from the center side toward the outer peripheral side and cooling is performed, there is no occurrence of yarn unevenness and the total number of linear polymers. Thus, a method for producing a synthetic fiber multifilament yarn that exhibits a remarkable effect in cooling more uniformly and efficiently is provided.

  According to the second aspect of the present invention, in the aspect of the melt spinning machine in which cooling air is sent from the center side toward the outer peripheral side to perform cooling, there is no occurrence of yarn unevenness and the total number of linear polymers. Thus, a synthetic fiber multifilament yarn manufacturing apparatus that exhibits a remarkable effect in cooling more uniformly and efficiently is provided.

  Hereinafter, the present invention will be described in more detail.

A method for producing a synthetic fiber multifilament yarn according to the present invention comprises spinning a synthetic fiber multifilament yarn by a melt spinning process having at least the following (A) to (D): It is.
(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 blowing member is connected to a spinning hole arrangement internal region of the die, and a cooling air flow path is provided in the connection portion, and the cooling air is supplied from the cooling air flow path to the cooling air blowing member. thing.
(D) Taking up the cooled linear polymer.

  Such a synthetic fiber multifilament yarn manufacturing method of the present invention, as shown in FIG. 1, replaces the conventional cooling air supply pipe structure shown in FIG. The (cooling air blowing member 5) is configured to be connected to a spin hole arrangement internal region of the die, and a cooling air flow path 12 for supplying cooling air is provided inside the connection portion.

  That is, FIG. 1 is a side schematic model cross-sectional view showing an example of the structure of the cooling air blowing portion inside and just below the base of the melt spinning machine used in the synthetic fiber manufacturing method of the present invention.

  In FIG. 1, 1 is a melt spinning machine, 2 is a melt spinneret, and the linear polymer 3 is discharged from the melt spinneret 2 and cooled, and taken up via an oil supply guide, an oiling roll, or a focusing guide. . The cooling is performed by blowing a cooling air flow blown from the cooling air blowing member 5 toward the outer peripheral side to the linear polymer 3. Reference numeral 6 denotes an oil supply guide or guide, which has a role of guiding a yarn path on which a large number of linear polymers travel.

  The cooling air blowing member 5 is connected to the spinning hole arrangement internal region of the base 2, and the cooling air flow passage 12 is provided inside the connection portion, and the cooling air blowing member 5 is cooled from the cooling air flow passage 12 to the cooling air blowing member 5. Wind is supplied.

  8 is a filtration layer, 9 is a pressure-resistant porous plate, 10 is a polymer supply path, 11 is a heat insulating material, and 13 is a ring nut.

  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 entire area of the die is a “central region of the die surface”, a large number of spinning holes 19 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 19 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 19 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.

  In the present invention, the “spinning hole arrangement internal region” is a region that is generally the same as the “central region of the C base surface”, but it does not necessarily have to be the same, and the inner side where the spinning holes are arranged. Say the area. In the spinning hole arrangement internal region, the cooling air blowing member 5 is connected to the spinning hole 19 internal region of the base 2, and further, a cooling air flow path 12 is provided inside the connection part, and the cooling air flow Cooling air is supplied from the passage 12 to the cooling air blowing member 5. Although only one cooling air flow path 12 may be provided at the center position of the base surface, a plurality of flow paths may be formed.

  According to the method and apparatus of the present invention, the linear polymer 3 comes into contact with the cooling air supply pipe or the cooling air flow is disturbed around the outside of the cooling air supply pipe. Is resolved. Generally, since the inside of the base is in a high temperature state, the periphery of the cooling air flow channel 12 is preferably covered with the heat insulating material 11 so that the low temperature state of the cooling air is maintained.

  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 method and apparatus of the present invention is wound on a winder, and 14 is necessary. Entangled nozzles used in accordance with the above, 15 is a first godie roller, 16 is a second godie roller, and 17 is a winder.

  In the present invention, more preferably, as shown in FIG. 3, the cooling air blown from the cooling air blowing member 5 is sucked by the suction mechanism 18 after the cooling air passes between the linear polymers. You may make it do. With such a configuration, the cooling air flow is formed as rectification, and in combination with the flow of the linear polymer 3 in which the yarn path is regularly fixed by the six yarn guides, the cooling is performed more effectively and quickly. It can give an action.

  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 to use a base having a diameter of about 100 mm and set the distance between adjacent bases (the shortest distance between central axes between two bases installed adjacent to each other) within a range of 130 to 200 mm. In particular, when the suction mechanism 18 is used, the air flow is less likely to interfere, and the distance can be shortened as described above. This leads to a shortened route of the molten polymer in the spinning machine, thereby improving productivity, It leads to quality improvement.

  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.

  When the suction mechanism 18 is used, the suction speed of the suction mechanism is preferably 0.8 to 1.2 times the above-described cooling air blowing speed, more preferably 0.9 to 1.1. It is better to double. 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. Moreover, it is preferable that the spinning holes 19 are 100 or more and 500 or less, that is, the number of filaments is 100 or more and 500 or less.

  As described above, the present invention is particularly 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. is there.

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). A synthetic fiber multifilament yarn manufacturing apparatus characterized by the above.
(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 device is an element that is connected to the spin hole arrangement internal region of the die and forms a flow path for supplying cooling air inside the connection portion.
(H) An element that takes up the cooled linear polymer.

  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 schematically in FIG. 1 is used, the one shown schematically in FIG. 4 is used as a comparative example, and the base shown in FIG. 5 (a) is used. Polyethylene terephthalate filament yarn (84 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 32.3 g / min, the melting temperature is 295 ° C., the diameter of the die is 100 mm, the number of spinning holes is 144 (the number of filaments is 144), the spinning hole arrangement is a double circle, the outer diameter is 65 mm, the inner diameter is 55 mm, The outer diameter of the rectifying medium is 37 mm, the length of the rectifying medium is 350 mm, the filtration accuracy of the rectifying medium is 40 μm, the cooling air discharge speed is 25 m, the cooling start point distance is 20 mm, and the take-up speed is 2500 m / min.

  Table 1 shows the results of evaluating and comparing the filaments obtained in the examples and comparative examples.

  As can be seen from Table 1, when the method / apparatus of the present invention is used, the strength / elongation has substantially the same physical properties in both the example product and the comparative example product. About Wooster half), the thing of this invention compared with the thing of a comparative example was a favorable thing without a nonuniformity.

In addition, in this evaluation, the evaluation measurement method of each fiber physical property is as follows.
(1) Strength and elongation:
The strength and elongation are obtained by stretching a test yarn having a length of 50 mm cut from a yarn (multifilament) manufactured using a general tensile tester to a break at a tensile speed of 400 mm / min. The average value was obtained by setting the 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 is a side schematic model cross-sectional view showing an example of the structure of a cooling air blowing portion inside and just below a base of a melt spinning machine used in the synthetic fiber manufacturing method of the present invention. FIG. 2 is a schematic model diagram illustrating an example of a process until the synthetic fiber yarn produced by the synthetic fiber multifilament yarn production method and apparatus of the present invention is wound on a winder. FIG. 3 shows an example of the structure of the cooling air blowing part inside the base of the melt spinning machine provided with a cooling air flow suction mechanism and directly under the base as a preferred embodiment of the synthetic fiber manufacturing method and apparatus of the present invention. It is side surface schematic model sectional drawing. FIG. 4 shows a conventional method in which spinning holes are arranged in an annular shape on a 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 is the side schematic model figure which showed the schematic model. 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 air supply port 5: Cooling air blowing member 6: Lubrication guide or guide 7: Lubrication guide, oiling roll or converging guide 8: Filtration layer 9 : Pressure-resistant perforated plate 10: polymer supply path 11: heat insulating material 12: cooling air flow path 13: ring nut 14: entanglement nozzle 15: first godet roller 16: second godet roller 17: winder 18: suction mechanism 19: spinning hole C : Central area of the base

Claims (2)

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 blowing member is connected to a spinning hole arrangement internal region of the die, and a cooling air flow path is provided in the connection portion, and the cooling air is supplied from the cooling air flow path to the cooling air blowing member. thing.
(D) Taking up the cooled linear polymer. 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 device is an element that is connected to the spin hole arrangement internal region of the die and forms a flow path for supplying cooling air inside the connection portion.
(H) An element that takes up the cooled linear polymer.

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