JP2003138438A - False twist textured yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a false twist textured yarn composed of ultrafine filaments having slight fluctuation of dyeing density in the fiber axis direction and capable of affording a uniform appearance when used in a woven or a knitted fabric. SOLUTION: This false twist textured yarn is obtained by carrying out false twist texturing of a thermoplastic synthetic fiber multifilament yarn. The single filament fineness of filaments constituting the false twist textured yarn is <=0.8 [dtex] and <=1.0 [%] value of CV in 5,000 data obtained by measurement with an FYL analyzer and digitizing the data. The false twist textured yarn is prepared by carrying out the false twist texturing of the thermoplastic synthetic fiber multifilament yarn. The single filament fineness of the filaments constituting the false twist textured yarn is <=0.8 [dtex] and <=25 [-] maximum value within 3-30 m wavelength of a power spectrum obtained by measurement with the FYL analyzer, digitizing the data and carrying out Fourier analysis of the resultant data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a false-twisted yarn of a thermoplastic synthetic fiber multifilament, and more specifically to a fine filament which gives a uniform appearance when used in a woven or knitted fabric with little variation in dyeing density in the fiber axis direction. The present invention relates to a configured false twisted yarn.

[0002]

2. Description of the Related Art In false twisting, thermoplastic synthetic fiber multifilaments are widely used as the most rational means for increasing the bulk. A false twist textured yarn composed of an ultrafine filament used in the field of sports clothing and the like is also on the market. In recent years, a high-speed drawing simultaneous false-twist textured yarn using a friction false-twisted body has also been developed from the viewpoint of cost pursuit. In the melt-spinning process, ultrafine filaments need to have a large number of discharge holes in a certain area of the spinneret, and the air permeability when air-cooling after melt discharge of the polymer is poor, and the thinning phenomenon just below the spinneret does not occur. Since it tends to be uniform, there is a problem in that periodic fineness unevenness is likely to occur in the fiber axis direction (so-called resonance periodic unevenness).

[0003] When a false twist textured yarn obtained by simultaneously and simultaneously falsely twisting highly oriented undrawn multifilaments composed of ultrafine filaments having such fineness irregularities in the fiber axis direction is evaluated in tubular knitting dyeing, Periodic light and shade difference (tiger stripe,
Called banding). In particular, when the simultaneous drawing false stretching is high-speed simultaneous drawing false twisting using a friction false twisted twisted product, the set draw ratio is added to the twisting tension and the untwisting tension in the fineness unevenness cycle of the highly oriented undrawn multifilament. The periodical fluctuations occur clearly, and the dyed tubular knitted fabric obtained from the processed yarn exhibits a strong periodicity difference that substantially matches the twisting and untwisting tension fluctuations.

When a dyed woven or knitted product is obtained by using a false twisted yarn having a strong periodic shade difference in a tubular knitted fabric, it causes unsightly stripes and streaks. The conditions of the melt spinning process are set to reduce the periodic fineness unevenness of the filament, but the woven and knitted products are produced with an acceptable range for the sharp stripes and the difference in shade that does not look like streaks. There are many threads.

[0005]

DISCLOSURE OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and weakens the periodic density difference of the dyed woven or knitted fabric of the false twisted textured yarn of the ultrafine filament, and makes it almost invisible. The present invention intends to provide a false twist textured yarn which can improve the dyeing quality of a woven or knitted product evenly by improving the above.

[0006]

[Means for Solving the Problems] Means for solving the above problems, that is, a first aspect of the present invention is a false twisted yarn comprising a thermoplastic synthetic fiber multifilament, which constitutes a false twisted yarn. Single filament fineness of the filament is 0.8 [dt
ex] or less, and a CV value of 5000 pieces of data measured and digitized by a FYL analyzer is 1.0 [%] or less, and a false twisted yarn, the second of which is
A false twisted yarn made of thermoplastic synthetic fiber multifilament, in which the filaments constituting the false twisted yarn have a single fiber fineness of 0.8 [dtex] or less, and the data digitized by a FYL analyzer are Fourier-transformed. The maximum value within the wavelength of 3 to 30 m of the power spectrum obtained by analysis is 25
[−] The following is a false twist textured yarn, the third of which is a false twist textured yarn satisfying both claim 1 and claim 4, and the fourth Is a false twisted textured yarn according to any one of claims 1 to 3, wherein the false twisted textured yarn is drawn and simultaneously false twisted with an undrawn multifilament by a friction false twisted twisted body and subjected to fluid entanglement treatment. Fifth, the single fiber fineness of the filaments forming the false twisted yarn is 0.4 [dte
x] or less, which is the false twisted yarn according to any one of claims 1 to 4, and the sixth thereof is the false twisted yarn according to any one of claims 1 to 5, wherein the false twisted yarn is polyester. It is a thread.

The thermoplastic synthetic fiber multifilament referred to in the present invention is a multifilament composed of a polymer having thermoplasticity, and mainly refers to polyester and polyamide. Specifically, polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene isophthalate, 6-nylon, 6,
6-nylon, 4,6-nylon, etc. are applicable. These may contain a small amount of a polymer, an antioxidant, an antistatic agent, a pigment, a matting agent, an optical brightening agent, a fine pore forming agent, and other additives. However, polyester is preferable, and polyethylene terephthalate is most preferable, in order to stably melt-spin a multifilament composed of ultrafine filaments.

The false twisted yarn of the present invention is obtained by false twisting the multifilament obtained by spinning the thermoplastic synthetic polymer as described above. The single fiber fineness of the filaments forming the false twisted yarn needs to be 0.8 [dtex] or less. If the single fiber fineness is greater than 0.8 [dtex],
The water pressure resistance of textiles for sports clothing becomes difficult to satisfy, and the texture is hard, which is not preferable. More preferably 0.4 [dt
ex] or less. However, if the monofilament fineness is too small, yarn breakage during false twisting and fluff of false twisted yarns increase, and the weaving and knitting properties deteriorate, so 0.1 [dtex] or more is preferable.

The false twist textured yarn of the present invention is measured by a FYL analyzer, and the CV value of 5000 digitized data is 1.0 [%] or less, or the data measured by a FYL analyzer is Fourier analyzed. It is necessary that the maximum value of the obtained power spectrum within the wavelength range of 3 to 30 m is 25 [-] or less.

The FYL analyzer is a device for continuously measuring the dyeing density in the fiber axis direction of a yarn, and its analog data can be converted into digital data by a commercially available AD converter and recorded in a personal computer. This data 5000
The small CV value means that the variation in dyeing density in the fiber axis direction of the yarn is small. (Detail measuring method will be described later.) C of commercially available ultrafine filament false twisted yarn
The V value is often about 1.5 [%]. Although it depends on the level of the power spectrum, which will be described later, if the textured yarn having a CV value of 1.5 [%] is evaluated by tubular knitting, it does not appear to be a strong difference in light and shade that may be taken as a defect at first glance. If you look at it seriously, you can see that it has a slight shade. This C
When false-twisted yarn having a V value of 1.5% is used as a weft of a woven fabric and dyed after weaving, it is not a defect,
Light stripes and streaky density differences are felt, which is not preferable. CV
The textured yarn having a value of more than 2.0% has a strong difference in shade at the first glance of the dyed tubular knitted fabric and fails. Of course, when it is used as a woven fabric, it has defects such as streaks and stripes and is judged as a rejected product. C
When the V value is 1.0% or less, there is no difference in shade even when the dyed knitted fabric is seen as being serious. It is a desirable and uniform one that does not feel the difference in shade.

On the other hand, if analog data measured by a FYL analyzer is converted into digital data by an AD converter and integrated in a personal computer, Fourier analysis is performed using commercially available software to obtain a power spectrum. The fact that the power spectrum of the specific wavelength (thread length) is small means that the periodicity of dyeing density fluctuation in the fiber axis direction is weak. A problem peculiar to the ultrafine filament is that periodic fineness unevenness is likely to occur due to poor cooling when melt-discharged from a discharge hole and air-cooled. When the false-stretching process is performed after the unstretched multifilament is stretched or at the same time as the stretching, the problematic periodicity is at a level of 3 to 30 m depending on the spinning speed and the stretching ratio. When the maximum value of the power spectrum within the wavelength of 3 to 30 m is 25 [-] or less, the variation in the dyeing density is less likely to appear periodically, and as a result, the dyed tubular knitted fabric or the dyed fabric is less likely to have stripes, which is preferable. . Power spectrum is 25
If it is stronger than [-], depending on the CV value level, it is not preferable because a light and shade difference in stripes becomes slightly visible on the dyed woven fabric used for the dyed tubular knitted fabric and the weft. When the power spectrum is higher than 30 [-], the dyed fabric used for the weft is often rejected due to a stripe defect, although it depends on the CV value level. FIG. 1 shows a graph (spectrogram) in which the horizontal axis is the wavelength and the vertical axis is the power spectrum. However, in the present invention, there is no part where the power spectrum is 25 [-] or more within the wavelength range of 3 to 30 m. This is an example of measurement of a preferable false twist textured yarn. FIG. 2 shows a spectrogram obtained by measuring another false twisted yarn. The power spectrum exceeds 25 [-] and is about 33 [-] at a wavelength of about 12 m, which is preferable in the present invention. There is no such thing.

The false twisted yarn satisfying both the above CV value of 1.0 [%] or less and the power spectrum of 25 [-] or less is satisfactory in the uniformity of the dyed woven fabric. It is a very preferable processed yarn.

In the false twisted yarn of the present invention, it is preferable that the undrawn multifilament is drawn and simultaneously false twisted by a friction false twisted body. In terms of high-speed productivity, simultaneous drawing and false-twisting with unstretched multifilament friction false-twisted body is excellent.
It is effective for cost reduction. In addition, continuous fluid entanglement treatment during simultaneous drawing false twist prevents winding defects, improves unwindability of the obtained false twist textured yarn, and prevents yarn breakage in the subsequent process. Is preferred. The degree of entanglement by the fluid entanglement process is preferably in the range of 20 to 150 [ke / m] as data obtained by the measuring method described later.

The total fineness of the false twisted yarn of the present invention is 10
It is preferably about [dtex] to 300 [dtex]. Also,
Constituents of multifilament to be supplied for false twisting In addition to normal round cross section, multifilament cross section has multi-lobed cross section, polygon cross section, flat cross section, hollow cross section, special deformed cross section, etc. Anything can be applied as long as it does not hurt. The cross section of the filaments forming the false twisted yarn is often subjected to cross-sectional deformation due to contact between filaments due to torsional deformation. The crimp characteristics of the false twist textured yarn are different between the case of the false twist of the one-stage heater and the case of the stabilizer treatment by the two-stage heater, but the crimp development rate by the method described later is preferably 5 to 60%.

The method for producing the false twist textured yarn of the present invention is not particularly limited, but an example will be described. The false twisted yarn of the present invention can be obtained by spinning a thermoplastic synthetic polymer in a melt spinning facility and performing false twisting after stretching or false twisting simultaneously with stretching. It is necessary that the single fiber fineness of the filament constituting the false twist textured yarn is 0.8 [dtex] or less. In order to reduce the FYL data CV value of the false twisted textured yarn and the maximum value of the power spectrum within the wavelength range of 3 to 30 m, in the melt spinning step, the thinning phenomenon of the melted and discharged filament is made uniform and undrawn. It is important to reduce the periodic fineness unevenness in the fiber axis direction of the multifilament. It is preferable that the unstretched multifilament has a URI value of 2.5 [%] or less according to the measurement method described later and a weak power spectrum in a wavelength portion of about 2 to 20 m. For that purpose, it is effective to widen the interval between each of the plurality of discharge holes provided in the spinneret and to arrange the discharge holes so that the air permeability becomes high. Also, it is effective to shorten the distance from the spinneret discharge surface to the point where air is blown by air cooling, and it is preferable to increase the wind speed to such an extent that spinnability is not impaired. However, if the spinneret discharge surface is cooled and the temperature drops, the operability and mechanical properties of the unstretched multifilament are impaired, so use a heater to keep the spinneret warm if necessary, and keep the wind direction constant. It is effective to devise such as providing such a current plate. The unstretched multifilament is wound as uniformly as possible with an appropriate oil agent. The fluid entanglement treatment may be performed so that the degree of entanglement becomes about 0.2 to 20 [ke / m] after air cooling and / or before winding.

In the case of false twisting after drawing an unstretched multifilament to obtain a stretched yarn, the spinning speed is not particularly limited, and the spinning is wound at 1000 to 4000 [m / min]. The unstretched multifilament after spinning and winding is appropriately stretched at a temperature near the glass transition temperature to form a stretched multifilament. The heat shrinkage can be appropriately adjusted by applying heat setting during stretching. After the spinning and the drawing are continued to obtain the drawn yarn, false twisting may be performed. When the undrawn multifilament is subjected to simultaneous drawing and false twisting, it is not preferable that it is too slow from the viewpoint of the yarn hooking property during simultaneous drawing and false twisting and the change with time of the undrawn multifilament.
A spinning winding speed of 00 [m / min] is preferable. As the false twisted twisted body, a pin spindle type, a swirling air nozzle type, a friction false twisted twisted body type (3-axis external contact friction false twist type, cross belt type nip false twist type), etc. can be used, but high speed productivity From the viewpoint, it is preferable that the unstretched multifilament is simultaneously stretched and false-twisted by using a friction false-twisted body. The false twisting process may be performed by using a one-stage heater or a two-stage heater by false twisting and stabilizing treatment. The yarn temperature at the exit of the first stage heater (heater for false twist fixing) is slightly different depending on the type of polymer, the case of false twisting the drawn yarn and the case of simultaneously twisting the undrawn yarn at the same time. ℃]
A degree is preferable. When using the second stage heater (residual torque reduction, crimped stabilization heater) for stabilization, set the temperature of the second stage heater to about 160 to 220 [° C] and set the feed rate of the second stage heater zone to 5 ~
It is preferable that the relaxation state is about 20%. The number of false twists during false twisting depends on the type of polymer, but in the case of the pin spindle type, the number of false twists [T / m] x √ processed yarn dtex
Is preferably about 26000 to 34000. It is preferable to perform the fluid entanglement treatment after the false twisting and before the winding from the viewpoints of preventing the winding shape defect, improving the untwisting property of the false twisted textured yarn, and improving the handleability in the subsequent step. An air jet nozzle called an interlacer nozzle or a Taslan nozzle can be preferably used as a nozzle used for the fluid entanglement treatment, and an interlacer nozzle is particularly preferable. The fluid confounding condition when using the interlacer nozzle is 0.3 to 5.0
The yarn is run in a relaxed state of about [%] and the air pressure is reduced to 0.
It may be about ^{2 to} 3.0 [kg / cm ² ]. By appropriately oiling before winding, unwinding property and handling in the subsequent process are improved.

The false twisted yarn obtained as described above is knitted and woven into a cloth, and dyed. If necessary, the false twisted yarn is subjected to actual twisting, oiling, sizing, etc., and then knitted or woven. The false twisted yarn is mixed with other yarns, mixed twist, mixed fiber,
You may mix and use by methods, such as a mixed knitting and a mixed weaving. The woven or knitted product is dyed according to its use. For example, textiles for sports clothing are relaxed, preset, dyed, and final set, but may be calendered before or after dyeing. If necessary, special functions such as moisture permeability and water repellency, water repellency, and heat absorption by moisture absorption can be imparted by laminating, coating, padding, or the like. In the case of using polyester fabrics for women's clothing, alkali reduction treatment prior to dyeing is preferable because the texture is softened. After dyeing, an antistatic agent or the like is appropriately added and final setting is performed to obtain a dyed woven fabric.

[0018]

EXAMPLES Specific examples will be described below. The method of measuring each characteristic value used in the present invention was as follows.

(Measurement of FYL analyzer) A FYL-500SR device manufactured by Toray Engineering Co., Ltd. is used. Basically, prepare a dyeing tank and a washing tank according to the instruction manual. The dyeing tank uses about 30 liters of water with 1 kg of the designated dye (Toray Blue) or the equivalent blue hue test dye.
And 200 g of a dispersant (Sun Salt WA manufactured by Nichika Kagaku Co., Ltd.) were put into a dissolved state and kept at 95 ° C. The washing tank is filled with water and kept at 85 ° C. Fresh water is constantly poured into the washing tank, and it is gradually replaced by overflow. The sample processed yarn is erected on the creel, unwound and guided to the dyeing tank. Adjust the angle of the Nelson roller appropriately so that the yarn-yarn contact on the Nelson roller in the dyeing tank does not occur, and the sample processed yarn is placed on the Nelson roller 45 times.
Let it wind. The sample processed yarn is guided from the dyeing tank to the cleaning nozzle and then to the cleaning tank. The sample-processed yarn is wound 7 times on the Nelson roller by appropriately adjusting the angle of the Nelson roller so that the yarn-yarn contact on the Nelson roller in the washing tank does not occur. From the washing tank, the sample processed yarn is guided to the draining nozzle and draining spindle in order, and then to the measuring section. Adjust the pressure regulating valve of the cleaning nozzle to set the pressure to 1.0 [kg / cm ² ]. Adjust the pressure regulator valve for the water drain nozzle to 1.2
Set to [kg / cm ² ]. For the measurement part, 30 standard samples (100% white and 40% blue) were prepared in advance.
Run at [m / min] and set FYL [%] data level.

The sample-processed yarn guided from the draining nozzle to the measuring section forms a yarn path according to the instruction manual. From the knot detection end, pass through the false twist part, lead to the color measurement section, and take it out by the ejector via the roller. Adjust the pressure regulator of the ejector to 1.5 [kg / cm ² ].

In the usual FYL measurement, data is output using the attached output part, but in the present invention, the FYL colorimetric analog signal is sent to the AD converter and Windows' 9.
7 Install Output data using a personal computer. A
NR-2000 manufactured by Keyence Corporation is used as the D converter, and the attached software is installed in the personal computer. Also, install Microsoft Excel '97 software on your computer. Connect the wiring from the AD converter to the personal computer using a dedicated PC card. Operate the personal computer and adjust the 0 point of the AD converter. F
Two YL analog data signal wirings are led to an AD converter so that the analog voltage signal can be converted into digital data and integrated into the hard disk of a personal computer.

If the yarn path of the sample processed yarn from the creel to the ejector, the AD converter, and the personal computer can be set, the FYL analyzer is operated at a speed of 30 [m / min]. Operate the personal computer to set the digital voltage data sampling frequency to 2.67 [Hz] (data sampling every 375 [millisecond]) and set the number of measurements to single mode,
The sampling number is set to 5000. Run the sample processed yarn, stay in the dyeing tank for a while and leave it for a long time. There is a deep dyeing part that has been dyed, so look at the FYL [%] data analog meter of the FYL analyzer and wait until it stabilizes. . (The FYL [%] data of the deep dyeing part shows a low value.) The newly sent yarn continuously sent to the dyeing tank passes through the colorimetric part, and the FYL [%] data rises to a high value. Then, after confirming that it is stable, operate the personal computer and perform digital voltage data sampling. The sampled digital voltage data [V] is saved in the hard disk of the personal computer (extension is .ndh).

(Calculation of CV value) Extension. From ndh. c
Finally to be able to calculate with Microsoft Excel '97 via sv. Convert to xls. Start Microsoft Excel '97, calculate the average value and population standard deviation of the accumulated 5000 sampling digital voltage data [V], and obtain the CV value by the following formula. CV value [%] = {(population standard deviation) / (average value)} × 100

(Calculation of maximum value of power spectrum) Digital sampling voltage data [V] is yarn length 0.1875 [m]
Every once in a while. Therefore, the yarn length corresponding to sampling of 5000 yarns corresponds to 937.5 [m]. Of this data, the first to 4096th sampling starts (thread length 7
68 [m]) is subjected to power spectrum analysis. Perform a Fourier analysis in the analysis tool of Microsoft Excel '97. Fourier analysis data is a complex number, but the function IMABS in Microsoft Excel '97
Is used to obtain the absolute value of the complex number, and set as 4096 power spectrum data from the first time to the 4096th time. The wavelength [m] is calculated from each measured yarn length with Microsoft Excel '97. The data of the first sampling start corresponds to the yarn length of 0.1875 [m], and the 4096th time corresponds to the yarn length of 768 [m], and the wavelength is derived by the following equations. Sampling nth wavelength [m] = 144 / sampling nth yarn length [m] = 144 / (0.1875 [m] × n) Therefore, the first sampling start wavelength is 768 [m],
The second time is 384 [m], the third time is 256 [m], and when sequentially calculated, the 4096th wavelength is 0.1875 [m]. Wavelength data [m] is plotted on the horizontal axis, and power spectrum data [-] is plotted on the vertical axis. The horizontal axis range is 3 to 30 [m] and the vertical axis is 0 [-].
A graph like the one shown in FIG. 1 is obtained by selecting the appropriate scale. The maximum value [-] of the power spectrum within the horizontal axis (wavelength) 3 to 30 [m] is read. For example, in the example of FIG. 1, the maximum value of the power spectrum is 13.3 [-], which is preferable as the false twisted yarn of the present invention.

(A degree of entanglement) A sample processed yarn having an appropriate length is taken out and vertically suspended by applying a load of 1/10 [cN / dtex] to the lower end. Then, an appropriate needle is put into the sample processed yarn, and the distance [mm] that the needle moves until the load is slowly lifted and lifted is measured 20 [times] to obtain an average value L [mm]. The degree of confounding is calculated by the following formula. Entanglement degree [ke / m] = 1000 / (2 x L)

(Crimp occurrence rate) A wrap reel having an appropriate frame circumference is used to form a 8-winding cassette under a load of 1/10 [cN / dtex]. Immerse in boiling water for 5 minutes with no load. Remove the sample from the boiling water and keep it wet 2 /
A load of 10 [cN / dtex] is applied, and the length m [cm] of the cassette after 1 minute is measured. Next, the load is removed, the water is lightly drained, and then dried in an oven at 60 ° C. for 30 minutes. Remove the yarn from the oven and let it cool for 1 hour, then 2/1
A load of 000 [cN / dtex] is applied, and the length n [cm] of the cassette after 1 minute is measured. Measurement is repeated 5 times, m [c
Average values M [cm] and N [cm] of m] and n [cm] are obtained. The crimp occurrence rate [%] is calculated by the following formula. Crimp occurrence rate [%] = {(M−N) / M} × 100

(URI value) It is measured by an inert test using Wooster Eve Nestester 3 manufactured by Zellbeger Wooster. A slot is selected by the denier of multifilament, and the yarn speed is 50 m / m while giving false twist.
Measure in for 2 minutes and draw a chart. At that time, adjust so that the average denier of the multifilament is drawn in the center of the chart. When the maximum value of the obtained chart is A [%] and the minimum value is B [%], the URI value is calculated by the following formula. URI [%] = A-B

(Periodic periodicity of fineness unevenness) It is measured by a normal test using Wooster Eve Nestester 3 manufactured by Zellbeger Wooster. A slot is selected by the denier of multifilament, and the yarn speed is 50 while giving false twist.
Measure at m / min for 10 minutes and draw a spectrogram with the attached power spectrum analyzer. If there are periodic unevenness of fineness, the high wavelength part of the power spectrum appears.

(Example 1) A polyethylene terephthalate semi-dal tip having an intrinsic viscosity of 0.62 was spun by using a melt spinning facility, in which 72 [ke] round discharge holes were arranged on the outer peripheral surface diameter of the spinneret 66 [mm]. Melt and discharge from the spinneret, and wind speed 0.45 [m / sec] from a point 20 [mm] below the spinneret discharge surface.
After air-cooling, applying an oil agent, winding it on a godet roller rotating at 2400 [m / min], and continuously setting the drawing heat to obtain 56 [dtex] / 72 [filament] polyethylene terephthalate drawn multifilaments. It was The drawn multifilament had a URI value of 1.5%, and the periodicity seen in the spectrogram of the Worcester-Even tester was weak. The drawn multifilament was false twisted with a single stage heater using a TH-312 type pin spindle type false twisting machine manufactured by Aikiki Seisakusho. False twisting speed is 120 [m
/ Min], the false twist number was 4000 [T / m], the heater temperature was 190 [° C], and the feed rate was adjusted so that the twisting tension was 6 [g]. The obtained false twisted yarn has a crimp development rate of 41.
The CV value of 5000 pieces of data measured with a FYL analyzer and digitized is 0.74 [%], and the maximum value within the wavelength range of 3 to 30 m of the power spectrum obtained by Fourier analysis is 13.0 [-]. ]Met. When the false twist textured yarn was dyed by the tubular knitting test, it was preferable that no stripe or streak-like density difference was observed at all, even if there was some irregularity. 5 for warp
A 6 [dtex] / 72 [fil] polyethylene terephthalate semi-dal oriented multifilament was sized and warped, and the false twisted yarn was used as a weft, and a warp density of 149
[Book / inch] and weft density 112 [Book / inch] were plain woven to obtain a high density taffeta fabric. By a conventional method, a relaxed, preset, dyed, and calendered to give a dyed woven fabric. The dye-processed woven fabric was soft and satisfied a certain level of water pressure resistance for use in sports clothing, and it was a uniform and preferable one in which no stripes or streaks due to uneven dyeing density in the fiber axis direction of the weft were felt.

(Comparative Example 1) A stretched multifilament (56 [dtex] / 48 [fil]) was obtained in substantially the same manner as in Example 1 except that the spinneret had 48 [ke] spinnerets. . The URI value was 1.4% and the periodicity was weak. A false twist textured yarn was obtained in substantially the same manner as in Example 1. The crimp occurrence rate of the false twist textured yarn is 48 [%], the CV value of the data of 5000 digitized and measured by FYL analyzer is 0.70 [%],
Wavelength of power spectrum obtained by Fourier analysis 3 to 30
The maximum value in m was 11.4 [-]. When a dyed tubular knitted fabric and a dyed woven fabric were obtained in the same manner as in Example 1, the dyeing uniformity was excellent, but the soft feel and the water pressure resistance of the woven fabric for sports clothing were unsatisfactory.

(Example 2) A polyethylene terephthalate semi-dal tip having an intrinsic viscosity of 0.62 was formed from a spinneret in which 72 [ke] discharge holes were arranged on the outer peripheral surface diameter of the spinneret 66 [mm] using a melt spinning facility. Melt and discharge, 20 from the spinneret discharge surface
Air-cooled from a point below [mm] at a wind speed of 0.45 [m / sec], and after applying an oil agent, at 2400 [m / min], two adjacent
Unstretched multifilament 2 obtained from spinneret of ke
The books were aligned and collected as 80 [dtex] / 144 [fil]. The URI value of the drawn non-stretched multifilament was 2.0 [%] and the periodicity was weak. Using a TH-312 type pin spindle type false twisting machine manufactured by Aikiki Co., Ltd., a single-stage heater was simultaneously drawn and false twisted to obtain a false twisted processed yarn. False twist number is 4
The temperature was 200 [T / m], the draw ratio was 1.47, and the heater temperature was 170 ° C. The crimp occurrence rate of the false twist textured yarn is 35.
The CV value of 5000 pieces of data measured by a FYL analyzer and digitized in [%] is 0.94 [%], and the maximum value in the wavelength range of 3 to 30 m of the power spectrum obtained by Fourier analysis is 17.0 [-. ]Met. A dyed tubular knitted fabric and a dyed fabric were obtained in the same manner as in Example 1. The dyed woven fabric was more preferable because the dyed woven fabric of Example 1 was improved in softness and water pressure resistance.

(Example 3) The unstretched multifilament obtained in Example 2 was subjected to a single-stage heater stretching simultaneous false twist using a HTS-1500 type 3-axis circumscribed friction false twist machine manufactured by Teijin Seiki.
False twisting speed 600 [m / min], draw ratio 1.4
The heater temperature was adjusted to 7 times and the yarn temperature at the heater outlet was set to 170 [° C]. The twisting disc was made of polyurethane, and four twisted discs each having a thickness of 9 [mm] and a diameter of 58 [mm] were used. The ratio of the twisting disk peripheral speed to the yarn speed is 1.8.
Set to double. Air entanglement treatment was performed with an interlacer nozzle before winding, and the degree of entanglement was 65 [ke / m]. The degree of crimp occurrence of the obtained false twisted yarn is 31%, and C of 5000 data digitized by measuring with a FYL analyzer.
The V value was 0.85 [%], and the maximum value in the wavelength range of 3 to 30 m of the power spectrum obtained by Fourier analysis was 13.3 [-]. Dyeing cylinder knitted fabrics and dyed fabrics were obtained in substantially the same manner as in Examples 1 and 2. The dye-processed woven fabric was as preferable as the dye-processed woven fabric of Example 2, and was superior to Example 2 in terms of false-twisting speed, and was extremely preferable overall.

(Comparative Example 2) In the melt spinning process of Example 2, one spinneret was produced by melt-discharging from a spinneret in which 144 [ke] discharge holes were arranged on the outer peripheral surface diameter of 66 [mm]. From
One unstretched multifilament is 80 [dtex] / 1
An unstretched multifilament was obtained in the same manner as in the melt spinning step of Example 2 except that the unstretched multifilament was collected as 44 [fil]. The URI value of the undrawn multifilament was 3.6%, and the periodicity was observed in the spectrogram for each wavelength (thread length) of about 8 m. The unstretched multifilament was simultaneously stretched and false-twisted in the same manner as in Example 3. When a tension meter was put in the untwisting zone, the data was digitized by an AD converter, integrated into a personal computer, a power spectrum was obtained, and a spectrogram was drawn. The crimp occurrence rate of the obtained false twisted yarn is 31 [%], the CV value of 5000 data digitized and measured by FYL analyzer is 2.14 [%], and the power spectrum of Fourier analysis is obtained. The maximum value within the wavelength range of 3 to 30 m was 31.5 [-]. The wavelength (thread length) showing the maximum value of the power spectrum was about 12 [m]. The dyed tubular knitted fabric of the obtained false twisted yarn does not have a clear tiger stripe, but it has a width and a difference in light and shade. It was a thing.

Table 1 shows conditions of Examples 1 to 3 and Comparative Examples 1 and 2, yarn physical properties, and evaluation results of woven fabrics.

[0035]

[Table 1]

[0036]

EFFECTS OF THE INVENTION In the present invention, the false twisted yarn composed of the conventional ultrafine filament is produced in the woven and knitted product as a permissible range in contrast to the densities such that the stripes do not look like stripes or stripes, but the fiber axis is produced. It is a novel false twisted yarn that can give a woven and knitted fabric an extremely uniform dyeing quality by passing the degree and / or periodicity of unevenness of dyeing density in the direction in a very strict evaluation standard. It is suitable for use in woven and knitted fabrics for sports clothing and women's clothing, and gives a soft, beautiful and uniform dyeing quality. When unstretched multifilament is drawn and simultaneously false twisted with a friction false twisted twisted body to obtain a false twisted yarn by fluid entanglement, a false twisted yarn excellent in handleability in the subsequent process can be obtained at low cost. To be The present invention is a novel one that has never existed before.

[Brief description of drawings]

FIG. 1 is a preferred example of a graph (spectrogram) drawn when a maximum value within a wavelength of 3 to 30 m of a power spectrum obtained by performing Fourier analysis on data obtained by measuring a false twist textured yarn of the present invention with an FYL analyzer and digitizing the data is obtained. Indicates.

FIG. 2 is a preferable graph (spectrogram) drawn when the maximum value within the wavelength range of 3 to 30 m of the power spectrum obtained by Fourier analysis of data obtained by measuring the false twisted yarn of the present invention with a FYL analyzer and digitizing it is not preferable. Here is an example:

Claims (6)

[Claims] 1. A false twisted yarn comprising a thermoplastic synthetic fiber multifilament, wherein the filaments constituting the false twisted yarn have a single fiber fineness of 0.8 [dtex] or less, and
A false twisted yarn, wherein the CV value of 5000 pieces of data measured by a YL analyzer and digitized is 1.0% or less. 2. A false twisted yarn comprising a thermoplastic synthetic fiber multifilament, wherein the filaments constituting the false twisted yarn have a single fiber fineness of 0.8 [dtex] or less, and F
A false twist textured yarn having a maximum value within a wavelength of 3 to 30 m of a power spectrum obtained by Fourier analysis of data digitized by a YL analyzer and 25 [-] or less. 3. A false twisted yarn, wherein the false twisted yarn satisfies both claim 1 and claim 2. 4. The false twisted yarn according to any one of claims 1 to 3, wherein the false twisted yarn is obtained by subjecting an undrawn multifilament to simultaneous draw and false false twisting with a friction false twisted twisted body and performing fluid entanglement treatment. 5. The false twisted yarn according to claim 1, wherein the filaments constituting the false twisted yarn have a single fiber fineness of 0.4 [dtex] or less. 6. The false twisted yarn is polyester.
The false twisted yarn according to any one of 1 to 5.