JP4395977B2 - Method for producing polyamide fiber - Google Patents

Description

（比較例１１〜２５）
熱処理装置内を通過させず、ローラ間延伸倍率を表１に示すように種々変更して行った以外は実施例１と同様に行った。測定により得られた第１ゴデローラ上での糸速度、スリップ量、破断伸度を表１に併せて示す。
【００２４】
比較例１１〜２５では熱処理装置の温度が低かったため、第１ゴデローラ速度をどのように設定しても糸条加熱による延伸効果が得られなかった。
【００２５】
【発明の効果】
本発明によれば、給油後の糸条が集束した状態で糸条ごと熱処理装置内で延伸することにより、一工程法の多糸条取りかつ省スペースで、高強度でかつ糸斑異常のない繊維を製造することが可能である。
【図面の簡単な説明】
【図１】本発明のポリアミドの製造方法の一実施態様を示す概略工程図である。
【符号の説明】
１：紡糸口金
２：冷却装置
３：油剤付与装置
４：輻射式熱処理装置
５：第１ゴデローラ
６：第２ゴデローラ
７：巻取装置
Ｙ：糸条[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a polyamide fiber. More specifically, the present invention relates to an improvement in a drawing process in a method for producing a polyamide fiber by direct spinning drawing.
[0002]
[Prior art]
The polyamide fiber production method including nylon 6 and nylon 66 includes a two-stroke method in which a spun yarn is wound once and stretched in the next stroke. ) And other one-step methods such as a direct spinning method in which the drawing process is omitted by drawing at a high speed. Is used in various fields regardless of whether it is for clothing or industrial materials.
[0003]
In this one-step method, as a means for drawing the yarn, a method of drawing the yarn by passing on rollers having different surface speeds, and a heating medium such as air or water vapor while stress is applied to the yarn. A method is generally used in which the yarn is heated and softened by the method described above, and is stretched by the stress of the yarn.
[0004]
When trying to obtain high-strength fibers by these methods, the following various problems occur.
[0005]
When trying to obtain high-strength fibers by the former mechanical stretching method, it is necessary to stretch between rollers at a high magnification. In this case, in order to prevent slippage between the roller surface and the yarn, the contact length between the yarn and the roller surface is increased by winding the roller a plurality of times using a long Nelson roller or increasing the diameter of the roller. Or by adding rollers to make the stretching multistage, the magnification is dispersed among the stretching rollers to reduce the stretching tension. However, the use of any of these methods leads to an increase in the size of production equipment due to an increase in GD length, diameter, addition of rollers, and the like.
[0006]
Further, in order to reduce the variation in yarn physical properties between filaments by the heat drawing method using the latter heat medium, a method of heat treating the yarn before the yarn is converged, that is, before passing through the oil application device, is disclosed in Japanese Patent Application Laid-Open No. Hei 10- No. 292221, Japanese Patent Laid-Open No. 10-121320, and the like. However, this method not only eliminates the hardness difference in the filament, but also moves the converging position of the yarn to the downstream side, so the associated airflow of the yarn under thin varieties and high speed spinning conditions. As a result, the spinning stress increases, resulting in a decrease in yield due to yarn breakage and a decrease in the strength of the yarn when adjusted to the same elongation.
[0007]
[Problems to be solved by the invention]
The present invention solves the above-mentioned problems of the prior art, and is a method for producing a polyamide fiber in a single-step multi-thread take-up and space-saving. The present invention provides a method for producing a polyamide fiber capable of obtaining a high-strength fiber by drawing by contact, for example, a radiation heat treatment.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the method for producing a polyamide fiber of the present invention mainly has the following configuration. That is, after spinning cooled polyamide, an oil was applied by oiling device, heated pressurized fiber yarn which is focused in a non-contact, Runisaishi Hikito in Goderora Thereafter, a first Goderora Goderora is single for take-off Subsequently, a single second godet roller for changing the direction of the yarn path downward is formed. The wrapping angle of the fiber yarn around both the godet rollers is less than 360 °. to perform before taking up by a manufacturing method, the polyamide fiber characterized by且one pressurized heat temperature is 200 ° C. or higher.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0010]
FIG. 1 is an example of an embodiment of the present invention, and is a schematic process diagram schematically showing a method for producing a polyamide fiber of the present invention in a direct spinning drawing method.
[0011]
First, the yarn Y obtained by melt-spinning polyamide from the spinneret 1 is cooled and solidified by a cooling device 2 that is cooled by blowing cooling air, and an oil agent is applied by an oil agent applying device 3.
The yarns that have passed through the oil application device and the filaments are gathered are contactlessly, preferably passed through a radiant heat treatment device 4 and heated and drawn so that the heating temperature during drawing is 200 ° C. or higher. Subsequently, the sheet is taken up by the first godet roller (take-up roller) 5, passed through the second godet roller 6 and the like, and then taken up by the winding device 7.
[0012]
In the above process, the melt-spun yarn is once cooled and solidified by a cooling device, and the oil agent is applied by an oil agent applying device, the filaments are converged, and then heated and stretched in a non-contact manner.
[0013]
In the method of the present invention, heating during stretching is performed in a non-contact manner. In the contact heating, a difference in the temperature of the yarn occurs between the contact portion with the heat treatment apparatus and the other portions, and a physical property difference is generated in the filament and between the filaments, which causes a decrease in strength.
[0014]
The non-contact heating at the time of stretching is preferably performed by radiation. As a result, the radiation wave reaches the filament located in the center of the yarn bundle due to the transmission of the radiation wave, and reaches the inner layer of the filament and is heated uniformly. Regardless of the inner / outer position, the surface layer / inner layer of a single fiber, the filament can be heated uniformly, and the stability of drawing in the heat treatment apparatus or after passing through the apparatus is improved, and between filaments and between yarns Thus, it is possible to obtain a fiber having excellent uniformity in which there is little difference in physical properties.
[0015]
In addition, in the manufacturing method of the polyamide fiber of this invention, the heating temperature at the time of extending | stretching needs to be 200 degreeC or more. When the heating temperature is 200 ° C. or more, the hardness of the filament is lowered to a level at which it can be stretched by spinning stress, and the stretching effect by the heat treatment is sufficiently exhibited. The upper limit of the temperature is not particularly limited, but if the temperature is too high, the spinning stability is not improved due to a decrease in tension in the heat treatment apparatus, and the yarn breakage rate is increased. preferable.
[0016]
In the method for producing a polyamide fiber according to the present invention, the godet roller comprises a single first godet roller for take-up and a single second godet roller for changing the direction of the yarn path downward. The winding angle of the fiber yarn around the godet roller is preferably less than 360 ° from the viewpoints of space-saving multi-threading and downsizing of the drawing device.
[0017]
Furthermore, it is more preferable that the surface temperature of the second godele roller is 110 ° C. or higher from the viewpoint of maintaining strength in a post-processing step such as dyeing.
[0018]
The ratio V ₂ / V ₁ of the surface speed V ₂ m / min of the second godet roller to the surface speed V ₁ m / min of the first godet roller is more preferably 1.0 to 3.0. In such a range, the drawing tension is too low to cause the yarn to be wound around the surface of the first godet roller, and the yarn breaks on the godet roller due to the tension of the yarn between the godet rollers. The results are favorable in terms of both quality and operation.
[0019]
The fiber manufacturing process to which the heat treatment apparatus is applied is not particularly limited, but is preferably a one-step method from the viewpoint of production efficiency.
[0020]
【Example】
Next, the present invention will be specifically described with reference to examples.
[0021]
In addition, the measurement of the characteristic value in an Example was performed as follows.
(a) Elongation at break Using a tensile testing machine (TENSILON RTM-100 manufactured by ORIENTEC), a stress strain curve was obtained under the conditions of a material length of 50 cm and a tensile speed of 100 cm / min.
(2) Yarn spots Measurement was performed using a Worcester Yarn Spot Measuring Device (USTER TESTER II manufactured by ZELLWEGER).
(3) Yarn speed and slip amount The yarn speed was measured using a laser Doppler yarn speedometer (TYPE6200 manufactured by MALVERN). Further, the slip amount was determined by the following equation from the difference between the surface speed of the godet roller determined by the above measurement and the yarn speed on the godet roller , and -5 m / min or more was determined to be slipping.
[0022]
Slip amount (m / min) = (Gode roller surface speed)-(Thread speed on the Gode roller)
(Examples 1-24, Comparative Examples 1-11)
It carried out according to the process shown in FIG. Nylon 6 chips having a relative viscosity (96% sulfuric acid as a solvent, sample concentration of 1 g / l, measured at room temperature of 25 ° C.) of 2.62 are fed to a melt extruder and melted at a spinning temperature of 270 ° C. It was discharged from a spinneret 1 having 20 25 mm spinning holes. The yarn Y is cooled by blowing cooling air from the cooling device 2 at an air temperature of 20 ° C. and an air speed of 30 m / min, the oil agent is applied by the oil agent applicator 3, and the yarn is converged. A non-contact radiation heat treatment apparatus 4 having an effective heat treatment length of 0.9 m located below 3.0 m was passed through and heat treated by radiation waves. The yarn exiting the heat treatment device is taken up by the first godet roller, taken up at 4000 m / min through the second godet roller (surface temperature 140 ° C.), and taken up at 4000 m / min by the take-up device 7 to obtain a 60 d / 20 f fiber. Obtained. At this time, the heat treatment apparatus temperature and the draw ratio between rollers were variously changed as shown in Table 1. Table 1 shows the yarn speed, slip amount, and elongation at break on the first godet roller obtained by the measurement. As is clear from Table 1, in Examples 1 to 24, there was no yarn slip on the first godele roller, and no abnormal waveform was observed in the resulting fiber yarn spots. Further, the difference in elongation from when the heat treatment apparatus was not used was also 3% or more, and the drawing effect in the heat treatment apparatus could be expressed. In Comparative Examples 1 to 10, since the temperature of the heat treatment apparatus was low, the drawing effect due to yarn heating could not be obtained no matter how the first godet roller speed was set.
[0023]
[Table 1]

(Comparative Examples 11-25)
It was carried out in the same manner as in Example 1 except that it was not allowed to pass through the heat treatment apparatus and the roller drawing ratio was variously changed as shown in Table 1. Table 1 shows the yarn speed, slip amount, and elongation at break on the first godet roller obtained by the measurement.
[0024]
In Comparative Examples 11 to 25, since the temperature of the heat treatment apparatus was low, the drawing effect by heating the yarn was not obtained no matter how the first godet roller speed was set.
[0025]
【The invention's effect】
According to the present invention, the yarn after refueling is gathered and stretched in the heat treatment apparatus together with the yarn, so that a single-step multi-thread take-up, space saving, high strength, and no yarn spot abnormality are caused. Can be manufactured.
[Brief description of the drawings]
FIG. 1 is a schematic process diagram showing one embodiment of a method for producing a polyamide of the present invention.
[Explanation of symbols]
1: Spinneret 2: Cooling device 3: Oil agent applying device 4: Radiation heat treatment device 5: First godet roller 6: Second godet roller 7: Winding device Y: Yarn

Claims (2)

After spinning cooled polyamide, an oil was applied by oiling device, heated pressurized fiber yarn which is focused in a non-contact, Hikito Runisaishi, Goderora is followed by a single first Goderora for take-off in Goderora thereafter And a single second godet roller for changing the direction of the yarn path downward, and the winding angle of the fiber yarn around both godet rollers is less than 360 °, and the heating is performed by the first godet roller after applying the oil. method for producing polyamide fibers, characterized in that the carried out prior to, and pressurizing the heat temperature is 200 ° C. or higher taking off. 2. The method for producing a polyamide fiber according to claim 1, wherein heating is performed by radiation.

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