JP2001140125A - Polyamide-based multifilament yarn, method for producing the same and woven fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a polyamide-based woven fabric having dry and smooth touch feeling and a natural grain appearance by a mottle of thickness without having disadvantages such as the generation of a longitudinal stripe and a difference in the grain appearance among production lots caused by a dispersion of the mottle of thickness. SOLUTION: This polyamide-based multifilament yarn is characterized by having irregularity of thickness in the fiber axis direction, 5-20% mean value of Uster irregularity in the fiber axis direction in the normal test and <=20% coefficient of variation in the Uster irregularity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a polyamide-based multifilament yarn, a method for producing the same, and a woven fabric. More specifically, a polyamide-based multi-layer that has a dry, smooth texture and natural heather tone due to thick and fine spots, and has no product defects such as vertical streaks caused by variations in thick and thin spots and heather feelings differ depending on product lots. The present invention relates to a filament yarn, a method for producing the same, and a woven fabric.

[0002]

2. Description of the Related Art Polyamide fibers have been used in various fields such as not only for clothing but also for industrial and interior purposes due to their excellent properties. However, these polyamide fibers have a unique slimy feeling, and have a poor dry feeling and a dry feeling as compared with natural fibers. Also,
In terms of appearance, it was only a uniform plain tone unique to synthetic fiber and lacked a natural feeling such as span tone.

Conventionally, various attempts have been made as means for imparting a dry feeling and a dry feeling to polyamide fibers, such as deforming the fiber cross section, modifying the polymer, and adding particles to the polymer. In this regard, a technique for giving a dry and mottled feel to the fabric by applying a thickness to the fiber axis direction has been studied.

Japanese Patent Publication No. 22576/1972 and Japanese Patent Publication No. 44/1988 discloses a method for imparting thickness with polyamide fibers.
No. 7744, a method of generating melt fracture utilizing abnormal flow in a spinneret,
No. 15573, JP-A-55-122017,
Japanese Patent Application Laid-Open No. 58-362107 discloses a method of spinning a mixture of different kinds of polymers. However, any of these methods is liable to cause yarn breakage, resulting in unstable yarn production and poor productivity.

Further, Japanese Patent Application Laid-Open No. Sho 62-191510,
Japanese Patent Application Laid-Open No. 63-21335 discloses a polyamide-based thick and thin yarn whose cross-sectional area fluctuates in the fiber axis direction.
These thick and thin yarns only had a long and thin cycle length of several tens of cm in the yarn longitudinal direction, and lacked a dry feeling when formed into a fiber cloth.

Furthermore, in the low-magnification stretching method often used for obtaining a thick and thin yarn, it is difficult to control the formation of the thick and thin by the conventional method. This is because the polyamide polymer is a hydrophilic polymer, water acts as a plasticizer in the fiber, and the drawing behavior changes greatly due to temperature and humidity fluctuations during the season, day and night, and the inside and outside of the undrawn yarn package. This is because there is a difference in moisture content between the layers and the thick and thin spot pattern varies. Variations in the thick and thin spot pattern cause defects in fabrics such as vertical streaks and heather feelings that differ depending on the product lot.

[0007]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, has a dry and smooth texture, has a natural heather tone due to thick and fine spots, and has a variation in thick and thin spots. It is an object of the present invention to provide a polyamide-based woven fabric which does not have a drawback such as a vertical streak and a feeling of heat depending on product lots.

[0008]

In order to solve the above-mentioned problems, the polyamide-based multifilament yarn of the present invention mainly has the following constitution. That is, it has a thickness in the fiber axis direction, an average value of Worcester spots in the fiber axis direction of 5 to 20% in a normal test, and a coefficient of variation of Worcester spots of 20%.
% Or less, the polyamide-based multifilament yarn.

The method for producing a polyamide-based multifilament yarn of the present invention mainly has the following constitution. That is, a polyamide-based undrawn yarn having a birefringence Δn of 20 × 10 ⁻³ or less is subjected to a temperature of 16 to 32 ° C. and a humidity of 40 to 90% RH.
After aging for 2 to 20 days under the conditions described above, the film is stretched 1.5 to 2.5 times between the supply roller and the stretching roller,
A method of producing a polyamide-based multifilament yarn, which is heat-set at 180 ° C.

Further, the fabric of the present invention mainly has the following constitution. That is, it has a thickness in the fiber axis direction, and the average value of Worcester spots in the fiber axis direction is 5 to 20 in a normal test.
% And a coefficient of variation of Worcester spots of not more than 20% is a woven fabric characterized by using a polyamide-based multifilament yarn for at least a warp yarn and / or a weft yarn.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The average value of Worcester spots in the fiber axis direction of a polyamide-based multifilament yarn having a thin and large thickness (hereinafter sometimes simply referred to as a thick and thin yarn) of the present invention is 5 to 20% in a normal test. Things. When a fabric is formed using the thick and thin yarn, the thick and thin yarn may be used only for the warp yarn, only the weft yarn, or both the warp yarn and the weft yarn, and when only one is used, the other yarn is not particularly selected. . When the Worcester spot average value is less than 5%, the appearance when dyed becomes a unique synthetic fiber without heather tone,
The dry and smooth texture desired by the present invention is not exhibited. On the other hand, the average value of such Worcester spots is 20%
When the ratio exceeds, the difference in shade of color at the time of dyeing is excessively emphasized, and the natural appearance is impaired.

Further, the coefficient of variation (CV) of Worcester spots of the thick and thin thread must be 20% or less, preferably 15% or less. When the Worcester variance coefficient exceeds 20%, the Worcester variability among products becomes too large, resulting in a drawback defect. In addition, when used for weft yarns, even though there is no defect, the sense of heat greatly varies, so that it is impossible to stably supply a fabric having the same appearance. The method for measuring Worcester spots will be described later, but the Worcester spot variation coefficient is defined by the following equation. (Worcester variance coefficient) = (Worcester variance standard deviation / Worcester variance average value) × 100 The number of yarns for measuring Worcester plaque is 10 or more. Also,
The measuring yarn may be one wound in a package before weaving, or the woven fabric may be disassembled into a measuring yarn.

The main component of the polyamide-based multifilament yarn of the present invention is not particularly limited as long as it is polyamide, but nylon 6 and nylon 66 are preferred in view of fiber forming ability and mechanical properties. The polyamide-based multifilament yarn of the present invention also includes sodium polyacrylate, polyvinylpyrrolidone, polyacrylic acid and its copolymer, polymethacrylic acid and its copolymer, polyvinyl alcohol and its copolymer, and cross-linked polyethylene. Moisture-absorbing and water-absorbing substances such as oxide polymers, polyamides,
General-purpose thermoplastic resins such as polyester and polyolefin may be contained within a range that does not impair the object of the present invention. Further, in addition to pigments such as titanium oxide and carbon black, conventionally known antioxidants, coloring inhibitors, light stabilizers, antistatic agents, and the like may be contained as long as the object of the present invention is not impaired.

The cross-sectional shape of the polyamide-based multifilament yarn of the present invention may be a round cross section, a convex cross section, a triangular cross section,
Multi-lobal section, flat section, H-shaped section, π-shaped section,
It may be a C-shaped cross section or another known cross section. Among them, a convex cross-section or a multi-lobal cross-section having 3 to 8 concave portions and the same number of convex portions is preferable in terms of excellent dry feeling, smooth feeling, high gloss and high water absorption, and further, a hollow portion inside the fiber. May be provided. Further, a cross-section mixed multifilament obtained by mixing two or more types of irregular cross sections may be used.

Next, a method for producing a polyamide-based multifilament yarn of the present invention will be described. First, an undrawn yarn is obtained by melt-spinning a polyamide by a conventional method, and is once wound around the package 1. This undrawn yarn is heated at a temperature of 16 to 32 ° C.
It is necessary to perform aging in a room controlled within a humidity of 40 to 90% RH. If not aged under such conditions, the fluctuation of the moisture content of the undrawn yarn increases,
The formation of thick and thin lines becomes unstable, and the unevenness of Worcester spots increases. In addition, the aging period must be 2 to 20 days. If it is less than 2 days, the aging period is not sufficient, and a difference in moisture content occurs between the inner and outer layers of the undrawn yarn package. On the other hand, if it exceeds 20 days, the moisture-absorbing crystallization of the undrawn yarn proceeds, and there is a difference in physical properties between the undrawn yarn and one having a short aging period. The undrawn yarn aged under such conditions is placed between the supply roller 2 and the drawing roller 4 as follows:
Stretch 5 to 2.5 times. At this time, slit heater 3
Is heated to 50 to 180 ° C.

Next, the method for producing the woven fabric of the present invention will be described.
The polyamide-based multifilament yarn is warped and / or
Or if it is a weft thread, it can be obtained by a conventional method.
Usually after weaving, preset, refining, dyeing, FIX processing,
The fabric is processed through the finishing set process.

[0017]

EXAMPLES The methods for measuring various physical properties in the present invention are as follows. A. Worcester spots (Normal test) The unevenness of the thickness of the multifilament yarn in the longitudinal direction is determined by USTER TESTE manufactured by Zellbeger Worcester Co., Ltd.
It was measured with R MONITOR C. The measurement conditions are as follows: yarn speed: 8 m / min, twist: S1.5, yarn tension: 1.5, measurement time: 0.5 minute, and measurement mode is normal, and the average deviation rate (U%) is measured. The measurement sample is a 4
m was taken as a sample. B. Cloth quality (vertical streak, variation in heather feeling) A visual inspection was performed, and a 4-grade evaluation was made. "◎" for "Very high grade and little variation in heather feeling", "High quality but slightly uneven heather feeling"
Is indicated by "な い", "No vertical line, but variation in heather feeling is recognized" is indicated by "△", and "There is a vertical line defect" is indicated by "X". C. Sensory evaluation of feeling characteristics (feather feeling, dry feeling) For each item, a sensory test was performed by five subjects and evaluated in three steps. “Excellent” is indicated by “◎”, “excellent” is indicated by “○”, and “normal” is indicated by “△”.
In addition, as for the feeling of heather, the thing "the heather feeling is too strong and the natural appearance is impaired" is represented by "x".

Example 1 The relative viscosity ηr in sulfuric acid was 2.
65 nylon 6 polymer was melt spun at a spinning temperature of 265 ° C. and a spinning speed of 800 m / min to produce 244 dtex (2
20 denier) and a multifilament undrawn yarn having a convex cross section of 24 filaments was obtained. The undrawn yarn is heated at a temperature of 26.4 to 27.6 ° C and a humidity of 65.2 to 77.2% R.
After aging for 3 to 18 days in an H environment, the film was stretched using the stretching apparatus shown in FIG. 1 at a supply roller speed of 300 m / min, a slit heater temperature of 125 ° C., and a stretching roller speed of 600 m / min (drawing ratio of 2), and 122 dtex. (11
0 denier) and a 24 filament thick yarn. Next, the thick yarn is woven as a warp yarn and a weft yarn, and
The greige was set at 0 ° C., then refined by a conventional method, dyed with a commercially available acid dye at about 95 ° C. for 60 minutes, FIX-treated, and finished at 170 ° C. to obtain a taffeta fabric. The cloth was disassembled and Worcester spots (normal test) of 30 arbitrary warp yarns were measured. The average value was 9.5.
The coefficient of variation was 0% and the coefficient of variation was 7.65%. The appearance of the obtained product had a natural feeling of heather, and was excellent in smoothness and dryness. In addition, there was no defect of the vertical streak, and the feeling of heather was uniform. The results are shown in Tables 1 and 2.

[0019]

[Table 1]

[0020]

[Table 2]

Examples 2 and 3 and Comparative Examples 1 and 2 A woven fabric was produced in the same manner as in Example 1 except that the draw ratio was changed by changing the speed of the supply roller in drawing the undrawn yarn. The results are shown in Tables 1 and 2. In Example 2, the feeling of heather was stronger than that of Example 1, but the dry feeling,
It had a good dry feel. In Example 3, although the sense of heather was moderate, the dryness and smoothness were excellent. In Comparative Example 1, although the dry feeling was excellent, the heather feeling was too strong and the natural appearance was impaired. Comparative Example 2 was plain in appearance and lacked a dry feeling and a dry feeling.

(Examples 4 and 5, Comparative Examples 3 and 4) A woven fabric was prepared in the same manner as in Example 1 except for the slit heater temperature during stretching. The results are shown in Tables 1 and 2. In Example 4, as compared with Example 1, a high-quality woven fabric having a slightly less heather feeling but an excellent dry feeling was obtained. Further, in Example 5, although the variation in the feeling of heat was slightly recognized, it was acceptable for practical use, had a natural appearance, and was excellent in smoothness. Comparative Example 3 was plain in appearance and lacked a dry feeling. Comparative Example 4 had a large variation in the feeling of heather and was not practical.

Example 6, Comparative Example 5 A woven fabric was produced in the same manner as in Example 1 except that the temperature and humidity fluctuation width in the undrawn yarn aging chamber was increased. The results are shown in Tables 1 and 2. In Example 6, although there was slight variation in the feeling of heat, the level was sufficient for practical use. In Comparative Example 5, the quality was impaired due to the large variation in the feeling of heat and the occurrence of warpage.

Comparative Example 6 A woven fabric was produced in the same manner as in Example 1 except that the width of the aging period of the undrawn yarn used was changed. The results are shown in Tables 1 and 2. Dry feeling,
Although it was excellent in smoothness, the variation in heather feeling was large, and it was not at a level that could withstand practical use.

[0025]

Industrial Applicability According to the present invention, there is provided a woven fabric which exhibits a natural heather-like appearance due to thick spots when dyed, and has a dry and dry feel due to having fine irregularities on the surface.

[Brief description of the drawings]

FIG. 1 is a schematic side view of an example of a drawing device for producing a polyamide-based multifilament yarn of the present invention.

[Explanation of symbols]

 1: undrawn yarn package 2: supply roller 3: slit heater 4: drawing roller

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4L035 BB32 BB79 BB89 BB91 DD02 DD12 DD20 FF10 4L036 MA06 MA20 MA25 MA33 PA03 PA17 RA27 UA01 4L048 AA24 AA36 AA45 AB07 AC01 BA01 BA02 CA00 CA16 EB05

Claims (4)

[Claims] Claims: 1. A wrinkle having an average thickness of 5 to 20% according to a normal test, having a thickness in the fiber axis direction and a mean value of Worcester spots in the fiber axis direction.
A polyamide multifilament yarn, wherein the coefficient of variation of Worcester spots is 20% or less. 2. The polyamide-based multifilament yarn according to claim 1, wherein the coefficient of variation of Worcester spots is 15% or less. 3. A polyamide undrawn yarn having a birefringence Δn of 20 × 10 ⁻³ or less is subjected to a temperature of 16 to 32 ° C. and a humidity of 40 to 90.
After aging for 2 to 20 days under the condition of% RH, stretched 1.5 to 2.5 times between the supply roller and the stretch roller,
A method for producing a polyamide-based multifilament yarn, comprising heat setting at 50 to 180 ° C. 4. The polyamide-based multifilament yarn according to claim 1, wherein at least a warp yarn and / or
Or a woven fabric characterized by being used for weft yarn