JP4148001B2 - Method for producing ultrafine multifilament yarn and melt spinning apparatus - Google Patents

Description

【００３２】
【発明の効果】
本発明によれば、紡糸口金面と前記口金面と前記冷却風の吹出部の上端面との距離を１０〜４０ｍｍに設定すると共に、前記冷却風が紡出された糸条に対して全周方向から吹き出すようにされ、かつ冷却風を紡糸方向（糸条の走行方向）に直角方向から下向きに５〜２０度傾斜して吹き出させることにより、紡糸口金面への冷却風の流入がなくなり、冷却風による紡糸口金面の温度斑が減少して口金面の雰囲気温度が安定し、マルチフィラメントが均一に冷却され、断面斑及び繊度斑が低減される。
【図面の簡単な説明】
【図１】 本発明の極細マルチフィラメント糸の製造工程と溶融紡糸装置を説明するための概略図である。
【符号の説明】
１ 溶融押出装置
２ 紡糸口金
３ 冷却装置
３１ 整流部材
３ａ 上端面
４ 油剤付与装置
５、６ 引取ローラ
７ 巻取装置[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a polyester ultrafine multifilament yarn having excellent yarn operability and good dyeing quality, and a melt spinning apparatus.
[0002]
[Prior art]
Conventionally, in a method for producing an ultrafine multifilament yarn, as a method for stably cooling the yarn discharged from the die, cooling air is blown from the entire circumferential direction of the yarn to perform uniform cooling. Annular cooling methods are known.
[0003]
There is also known a method in which cooling air is blown from a direction substantially perpendicular to the spun yarn, and the blowing air is slightly weakened and suction is performed from the opposite side. Also known is a method for preventing fineness unevenness due to yarn swinging by directing the cooling air blowing direction slightly upward rather than at right angles to the spun yarn and bringing the solidification point of the yarn closer to the base surface. It has been.
[0004]
In addition, it has been proposed to provide a partition plate between the base and the cooling device to prevent the flow of cooling air near the base, reduce temperature spots on the base surface, and prevent cross-section spots and fineness spots (patent) Reference 1).
[0005]
However, when the single fiber fineness is made smaller, cross-sectional spots and fineness spots generated on the yarn increase, so the distance between the spinneret surface and the upper end surface of the cooling air blowing portion is made smaller, and the yarn The method of bringing the solidification point close to the base surface and preventing yarn swinging is effective in preventing unevenness, but for example, the distance between the spinneret surface and the upper end surface of the cooling air blowing portion is less than 15 mm. If it takes, the base will be cold and a problem will arise in operability. In addition, in the method using a partition plate between the spinneret and the cooling device, the flow of cooling air to the vicinity of the base cannot be prevented, and the effect of preventing cross-sectional spots and fineness spots cannot be obtained (Patent Document 1). reference.).
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 9-137317 [0007]
[Problems to be solved by the invention]
Accordingly, an object of the present invention is to provide a cross-sectional spot and a fineness spot even when a polyester ultrafine multifilament yarn having a single yarn fineness of 1.2 dtex or less is melt-spun at a high take-up speed of, for example, 2,000 m / min or more. It is an object of the present invention to provide a method for producing a polyester extra fine multifilament yarn and a melt spinning apparatus capable of spinning a yarn with a small amount of yarn.
[0008]
[Means for Solving the Problems]
The present invention is intended to achieve the above object, and the method for producing a polyester extra fine multifilament yarn of the present invention is a method for producing a polyester extra fine multifilament yarn having a single fiber fineness of 1.2 decitex or less. When the spun yarn is taken out while being cooled by cooling air below the spinneret, the distance between the spinneret surface and the upper end surface of the cooling air blowing portion is 10 to 40 mm. The cooling air is blown out from the entire circumferential direction with respect to the spun yarn , and the running direction of the spun yarn is inclined 5 to 20 degrees downward from a right angle direction. An ultrafine multifilament yarn manufacturing method characterized by being blown out.
[0009]
The method for producing an ultrafine multifilament yarn according to the present invention comprises a polyester ultrafine multifilament having a single fiber fineness of 1.2 decitex or less, with a spun yarn being taken down at a take-up speed of 2,000 m / min or lower while being cooled by cooling air below the spinneret. It is particularly suitable for producing fillant yarns.
[0010]
The melt spinning apparatus for ultrafine multifilament yarns of the present invention comprises a melt extrusion apparatus equipped with a spinneret, a cooling apparatus having a cooling air blowing section, an oil agent applying apparatus and a winding apparatus , and has a single fiber fineness of 1. In a melt spinning apparatus for polyester extra-fine multifilament yarn of 2 decitex or less, the distance between the spinneret surface and the upper end surface of the cooling air blowing portion is set to 10 to 40 mm, and the yarn from which the cooling air is spun It has been blown out from the entire circumferential direction relative to the strip, and ultrafine characterized by comprising forming inclined 5-20 degrees downward from the direction perpendicular blowing direction of the cooling air in the spinning direction of the cooling device A melt extrusion apparatus equipped with a spinneret for a melt spinning apparatus for multifilament yarns.
[0011]
In this melt spinning apparatus, the cooling device has a rectifying member that adjusts the direction of the cooling air, and the rectifying member has a hole in which holes inclined by 5 to 20 degrees downward from a direction perpendicular to the spinning direction are formed. It is included as a preferable aspect that it is comprised with the sex member.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the method for producing an ultrafine multifilament yarn of the present invention will be described in detail with reference to FIG. FIG. 1 is a schematic view for explaining a production process of an ultrafine multifilament yarn and a melt spinning apparatus of the present invention.
[0013]
In FIG. 1, the melt spinning apparatus includes a melt extrusion apparatus 1, a cooling apparatus 3, an oil agent applying apparatus 4, take-up rollers 5 and 6, and a winding apparatus 7. The melt extrusion apparatus 1 has a spinneret 2, and the polymer melted in the melt extrusion apparatus 1 is discharged from the spinneret 2. The shape of the discharge hole of the spinneret 2 can be appropriately selected in order to obtain a filament having any desired cross-sectional shape among various cross-sectional shapes such as a round cross section, a triangular cross section, and a multi-leaf cross section.
[0014]
The melted yarn discharged from the spinneret 2 is then cooled and solidified in the cooling device 3, and then the oil agent is applied by the oil agent applying device 4, and then wound through the pair of take-up rollers 5 and 6. It is wound up by the device 7.
[0015]
The cooling device 3 preferably has a rectifying member 31, and the rectifying member 31 is of a type that rectifies the cooling air supplied to the cooling device 3 and applies the cooling air to the yarn. it can be employed circumferential quench scheme blown from the entire circumferential direction with respect to. Further, in the rectifying member 31 of the cooling device 3, the cooling air outlet is opened in the spinning direction (traveling direction of the spun yarn), and is a hole inclined 5 to 20 degrees downward from the direction perpendicular to the spinning direction. Is a porous member formed. The rectifying member 31 rectifies the cooling air supplied to the cooling device 3 and forms cooling air inclined downward from the direction perpendicular to the spinning direction. The shape of the holes may be circular, trapezoidal, octagonal, or hexagonal, and is an array of holes that are open from the inside to the outside and inclined from the inside to the outside by 5 to 20 degrees over the entire surface.
[0016]
Examples of the porous member in which inclined holes are formed include a porous member obtained by thermosetting and molding a cellulose ribbon in a spiral shape. This porous member is formed by impregnating a cellulose ribbon (material: paper) with a thermosetting resin (phenolic resin) and then heat-curing to form gaps (pores: about 40 μm in size) in the ribbon layer. The gaps are uniformly distributed from the outer periphery toward the center. And when winding this cellulose ribbon helically, a clearance gap inclines toward a center by attaching an inclination and winding. The hole communicates from the inside to the outside.
[0017]
The material constituting the porous member in which the inclined holes are arranged is not particularly limited as long as it has an appropriate rigidity, such as paper, wood, metal, and synthetic resin.
[0018]
In the melt-extrusion apparatus 1, the distance L between the spinneret 2 surface and the upper end surface 3a of the cooling air blowing portion of the cooling device 3 is important in controlling the quality of fineness unevenness of the undrawn yarn. In order to prevent the occurrence of fineness unevenness, it is effective to stably cool the yarn discharged from the spinneret 2, and when the distance L becomes large, the yarn which has not been solidified immediately after the discharge. The swaying of the yarn due to the blowing of cooling air to the strip becomes large, and a large number of cross-section spots and fineness spots occur. For this reason, it is preferable that the spinneret surface 2 and the upper end surface 3a of the cooling air blowing portion be as close as possible. On the other hand, if the spinneret 2 and the upper end surface 3a of the cooling air blowing portion are too close, Partial temperature spots are generated on the surface of the spinneret 2, the atmospheric temperature of the surface of the spinneret 2 is greatly disturbed, the filaments cannot be cooled uniformly, and structural spots are generated between the filaments.
[0019]
However, in the present invention, even if the distance L between the spinneret surface 2 and the upper end surface 3a of the cooling air discharge portion is small, the cooling air supplied to the cooling device 3 is allowed to pass through the rectifying member 31 to perform spinning. Since the air can be blown downward from the direction perpendicular to the direction, the cooling air does not flow into the spinneret 2 surface, and the atmospheric temperature of the spinneret 2 surface by the cooling air is not disturbed.
[0020]
As described above, in the present invention, focusing on the atmospheric temperature of the spinneret surface, the distance L between the spinneret 2 surface and the upper end surface 3a of the cooling air blowing portion is set in the range of 10 to 40 mm, and the cooling air is The blowing direction of the cooling air is inclined by 5 to 20 degrees downward from the direction perpendicular to the spinning direction (running direction of the yarn), so that the solidification point of the yarn is brought close to the base surface, and the yarn shakes. Can prevent both cross-section spots and fineness spots in multifilament yarns even when spinning ultrafine multifilament yarns, improving the structure variation between single fibers and improving quality. .
[0021]
Next, a melt spinning method for obtaining an ultrafine multifilament yarn using the melt spinning apparatus will be described. The above-described melt spinning apparatus is suitable for melt spinning for melting ultrafine multifilament yarns. Examples of such yarns include yarns having a single yarn total fineness of 50 to 100 dtex and a filament number of about 70 to 200. Is mentioned.
[0022]
The present invention is a method for producing a polyester ultrafine multifilament yarn having a single fiber fineness of 1.2 dtex or less. When the single fiber fineness exceeds 1.2 decitex, when the distance between the spinneret surface and the upper end surface of the cooling air blowing portion is 40 mm or less, it is rapidly cooled, and the yarn-making property tends to deteriorate.
Moreover, if the single fiber fineness is less than 0.2 dtex, the spinning property tends to be deteriorated by melt spinning.
[0023]
Moreover, when performing melt spinning of ultrafine multifilament yarns using the above melt spinning apparatus, it is preferable to perform spinning winding at a spinning speed of about 2,000 to 3,500 m / min. When the spinning speed is less than 2,000 m / min, the productivity is inferior. When the spinning speed exceeds 3,500 m / min, the spinning tension increases, and problems such as yarn breakage tend to occur.
[0024]
Further, in the case of the melt spinning apparatus described above, the flow regulating member 31 of the cooling apparatus 3 is a porous member, and the arrangement of the holes is inclined downward from 5 degrees to 20 degrees from a direction perpendicular to the spinning direction. . When the hole arrangement of the porous member is downward at less than 5 degrees in the spinning direction, the blown cooling air flows into the base, and when it exceeds 20 degrees, the cooling air substantially contacts the yarn. Falls downward, indicating a tendency for the effect to be impaired.
[0025]
Further, the wind speed of the cooling air supplied from the cooling device 3 is preferably about 0.1 to 0.3 m / second, and the distance between the spun yarn and the cooling device 3 is about 5 to 20 mm. It is preferable. When the cooling air velocity is less than 0.1 m / sec, the yarn is not sufficiently cooled, and the yarn-making property is deteriorated, and when it exceeds 0.3 m / sec, yarn swaying occurs and the effect tends to be impaired. Also, if the distance between the yarn and the cooling device is less than 5 mm, there is a problem that the cooling device and the yarn come into contact with each other and yarn breakage occurs. Shows a tendency to get worse.
[0026]
【Example】
The following four types of melt spinning apparatuses (the following Example 1, Comparative Examples 1 and 2 and Comparative Examples) in which the material of the rectifying member of the cooling device, the direction of the cooling air, and the distance L between the cooling air and the upper end surface of the blowing portion are different. Example 3), the number of nozzle holes was 144, the spinning temperature was 280 ° C., the cooling air speed was 0.2 m / s, the distance between the cooling device and the yarn was 10 mm, the spinning speed was 2500 m / min, and the 56 dtex / 144 filaments Polyethylene terephthalate yarn was melt spun.
[0027]
(Example 1)
In the melt spinning apparatus shown in FIG. 1, a cellulose ribbon is spirally formed as a porous member in which a rectifying member 31 of the cooling device 3 is opened in the spinning direction and has a hole inclined downward from a direction perpendicular to the spinning direction. A melt spinning apparatus was used in which a porous member (hole diameter 40 μm, 10 ° downward) wound and thermoset was used, and the distance L between the cooling air and the upper end surface of the blowing portion was 15 mm.
[0028]
(Comparative Example 1)
In the melt spinning apparatus shown in FIG. 1, a porous member (pore diameter: 40 μm) obtained by sintering metal powder is used as the porous member opened at right angles to the spinning direction in the rectifying member 31 of the cooling device 3. A melt spinning apparatus having a distance L to the upper end surface of 15 mm was used.
[0029]
(Comparative Example 2)
In the melt spinning apparatus shown in FIG. 1, melt spinning using a wire mesh (100 mesh) opened at right angles to the spinning direction as the rectifying member 31 of the cooling apparatus 3 and the distance L between the cooling air and the upper end surface of the blowing part is 15 mm. A device was used.
(Comparative Example 3)
In the melt spinning apparatus shown in FIG. 1, a cellulose ribbon is spirally formed as a porous member in which a rectifying member 31 of the cooling device 3 is opened in the spinning direction and has a hole inclined downward from a direction perpendicular to the spinning direction. A melt spinning apparatus was used in which a porous member (hole diameter 40 μm, 10 ° downward) wound and thermoset was used, and the distance L between the cooling air and the upper end surface of the blowing portion was 50 mm.
[0030]
Melt spinning was performed using the above four types of melt spinning apparatuses, and the temperature of the die surface and Wooster spots were measured. The results are shown in Table 1.
(Worcester spots)
Worcester spots were measured at a yarn speed of 25 m / min using a ZELLWEGER USTER USTER TESTER UT-4.
[0031]
[Table 1]

[0032]
【The invention's effect】
According to the present invention, the distance between the spinneret surface, the base surface, and the upper end surface of the cooling air blowing portion is set to 10 to 40 mm, and the entire circumference with respect to the yarn on which the cooling air is spun. The cooling air is blown out at an angle of 5 to 20 degrees downward from the direction perpendicular to the spinning direction (running direction of the yarn), so that the cooling air does not flow into the spinneret surface. The temperature variation on the spinneret surface due to the cooling air is reduced, the atmosphere temperature on the spinneret surface is stabilized, the multifilament is uniformly cooled, and the cross-section unevenness and fineness unevenness are reduced.
[Brief description of the drawings]
FIG. 1 is a schematic view for explaining a production process of an ultrafine multifilament yarn of the present invention and a melt spinning apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Melt extrusion apparatus 2 Spinneret 3 Cooling apparatus 31 Rectification member 3a Upper end surface 4 Oil supply apparatus 5, 6 Take-up roller 7 Winding apparatus

Claims (5)

In the method for producing a polyester ultrafine multifilament yarn having a single fiber fineness of 1.2 dtex or less, when the polyester is melt-spun from the spinneret and the spun yarn is taken down while being cooled by cooling air below the spinneret, The distance between the spinneret surface and the upper end surface of the cooling air blowing portion is set to 10 to 40 mm, and the cooling air is blown from the entire circumferential direction to the spun yarn. A method for producing an ultrafine multifilament yarn, wherein the spun yarn is blown off at an angle of 5 to 20 degrees downward from a direction perpendicular to the running direction of the spun yarn. 2. The method for producing an ultrafine multifilament yarn according to claim 1, wherein the spun yarn is drawn at a take-up speed of 2,000 m / min or more while being cooled by cooling air below the spinneret. In a melt spinning apparatus for a polyester ultrafine multifilament yarn having a single fiber fineness of 1.2 decitex or less, comprising a melt extrusion apparatus equipped with a spinneret, a cooling apparatus having a cooling air blowing section, an oil agent applying apparatus and a winding apparatus. The distance between the spinneret surface and the upper end surface of the cooling air blowing portion is set to 10 to 40 mm, and the cooling air is blown out from the entire circumferential direction to the spun yarn, and the An ultrafine multifilament yarn melt spinning apparatus characterized in that the cooling air blowing direction of the cooling device is inclined 5 to 20 degrees downward from a direction perpendicular to the spinning direction. The melt spinning apparatus for ultra-fine multifilament yarn according to claim 3, wherein the cooling device includes a rectifying member that adjusts the direction of the cooling air. 5. The apparatus for melt spinning ultrafine multifilament yarn according to claim 4, wherein the rectifying member is composed of a porous member in which holes inclined by 5 to 20 degrees downward from a direction perpendicular to the spinning direction are formed. .

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