JPH11315436A - Polyester fine fiber yarn and method for producing the same - Google Patents

Abstract

(57) [Problem] To provide a polyester fine fiber which does not require large-scale equipment and complicated management in production, and has a large contrast between a deeply dyed portion and a lightly dyed portion; To provide a method capable of easily and highly producing polyester thick fiber yarn. SOLUTION: 80% by weight or more of all the filaments are composed of a lightly dyed portion forming details, and 60% by weight or more of a deeply dyed portion forming a thick portion. Is between 1 and 3%, the polyester thin fiber yarn having a boiling water shrinkage (BWS) of 3% or less, and the polyester unstretched yarn having a entangled portion by fluid treatment at a rate of 5 to 20 / m. A method for producing a polyester thick fiber yarn which is subjected to a heat drawing treatment with a resistance pin and a relaxation heat treatment subsequent thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester thick fiber yarn which, when made into a fabric for use in clothing or interior use, has a light-colored portion present in the deeply-colored portion in a lustrous appearance. And a method for producing the same.

[0002]

2. Description of the Related Art As a means for dyeing light and shade of a fiber itself, there is a thick and thin fiber yarn conventionally employing a semi-drawing condition. It is known that a marbling-like appearance resulting from a tint effect based on color can be obtained.

[0003] However, a thick and thin fiber yarn obtained by employing the above-mentioned semi-drawing condition shows a finely dispersed state when it is made into a fabric, and a drawn region with a sufficient orientation is not formed in detail. For this reason, the detail does not have the same light-colored dyeing property as that of the drawn yarn, and the light-and-shade dyeing property that provides a sufficient contrast cannot be sufficiently expressed.

[0004] In order to obtain a light and shade dyeing effect having a sufficient contrast, the thick and fine parts of each filament forming the multifilament yarn may be concentrated in the deep and lightly dyed parts, respectively. For example, JP-A-59-137523 describes a method for obtaining a thick fiber yarn by heat-treating an undrawn yarn intermittently applied with water and then false-twisting the undrawn yarn. . Japanese Patent Application Laid-Open No. 7-229030 discloses a deep-dyeing fabric of a fine fiber yarn in which the ratio of the thick portion forming the fine fiber yarn is larger than the ratio of the details. It is disclosed that a lightly dyed portion is present in the portion as a cloth having an appearance in which the portion is lightly applied.

[0005] However, the former Japanese Patent Application Laid-Open No. 59-1375.
According to No. 23, complicated management for randomly and intermittently applying water to the yarn is required, and it is difficult to increase the productivity because the period of the mottling is controlled by time. In addition, the process is complicated because false twisting is indispensable. In the latter Japanese Patent Application Laid-Open No. Hei 7-229030, since unevenness is imparted by randomly changing the take-up speed of the yarn to be drawn in the drawing area, complicated management is required similarly to the former. Required,
Moreover, productivity is low.

[0006]

On the other hand, the present inventors have made intensive studies on thick and thin polyester fiber yarns. As a result, the cycle between the deeply dyed portion and the lightly dyed portion is random,
In addition, the contrast between the deep-colored portion and the light-colored portion is a polyester thick fiber yarn having a large contrast, and the light-colored portion is present in the deep-colored portion in a crisp tone by forming a deep-colored fabric using the thick fiber yarn. Polyester thin fiber yarn to be a fabric showing appearance,
And a production method capable of producing the polyester thick and thin fiber yarns with high productivity.

Accordingly, an object of the present invention is to provide a polyester thick and thin fiber yarn which can be produced without requiring large-scale equipment and complicated management, wherein the cycle between the deeply dyed portion and the lightly dyed portion is random, Another object of the present invention is to provide a polyester thick and thin fiber yarn having a large contrast between a deeply dyed portion and a lightly dyed portion, and a method for easily and reliably producing the polyester thick and thin fiber yarn at a high rate.

[0008]

SUMMARY OF THE INVENTION The above-mentioned object is achieved by the following polyester thick fiber yarn of the present invention and a method for producing the same. That is, the polyester thick fiber yarn of the present invention is a polyester thick fiber yarn composed of a multifilament yarn having a thickness in the length direction, and the polyester thick fiber yarn comprises 80% of the total filaments.
More than 60% by weight of all filaments consist of a thick dyed part which is thick, and the length of the light dyed part is 10 to 40%.
mm, the ratio of lightly dyed portions is smaller than the ratio of darkly dyed portions, the coefficient of variation CV of thickness unevenness is 1 to 3%, and the boiling water shrinkage (BWS) is 3% or less. Consists of fine fiber yarn.

The method for producing a polyester thick fiber yarn of the present invention is a method for producing a polyester thick fiber yarn having the above constitution, and has a birefringence (Δn) of 30 × 10 ^-3 or more.
And the entangled portion given by the fluid treatment is 5-2
The polyester unstretched yarn provided at a rate of 0 yarns / m is continuously subjected to a heat stretching treatment with a heat friction resistance pin under conditions satisfying the following formulas and a relaxation heat treatment following the heating stretching treatment. This is a method for obtaining a polyester fine fiber yarn.

MDR × 0.45 ≦ DR ≦ MDR × 0.50 1 ≦ RR ≦ 10 Tg ≦ TP ≦ Tc Tc ≦ THP ≦ Tm [where, in the above formulas, DR is a stretching ratio, M
DR is the maximum draw ratio of the undrawn yarn, RR is the relaxation rate (%) in the relaxation heat treatment region, TP is the temperature (° C.) of the frictional resistance pin in the draw region, THP is the relaxation heat treatment temperature (° C.), and Tg is not. The glass transition temperature (° C.) of the drawn yarn, Tc represents the crystallization temperature (° C.) of the undrawn yarn, and Tm represents the melting point (° C.) of the undrawn yarn. ]

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The polyester thick and thin fiber yarn of the present invention, that is, a lightly dyed portion in which at least 80% by weight of all the filaments forming the multifilament yarn form details, 60% by weight or more of the thick-colored portion is a thick portion, and the light-colored portion is 10 to 40 mm in length, and the ratio of the light-colored portion is smaller than the ratio of the dark-colored portion, Furthermore, the coefficient of variation CV of thickness unevenness
Is 1 to 3%, and the polyester forming each filament of the polyester thin fiber yarn having a boiling water shrinkage (BWS) of 3% or less is mainly composed of ethylene terephthalate or butylene terephthalate. Polyester as a unit, specifically, polyethylene terephthalate, polybutylene terephthalate, a copolymerized polyester obtained by copolymerizing less than 5 mol% of a copolymer component, a polyester mixture containing a small amount of a blend component, and the like, and particularly preferred. Is polyethylene terephthalate.

The cross-sectional shape of each of these filaments may be any of a round cross-section or an irregular cross-section such as triangular, multi-lobed, or flat, and is not particularly limited.

As described above, the multifilament yarn forming the polyester thick fiber yarn of the present invention is formed by alternately repeating lightly dyed portions and deeply dyed portions in the length direction. 80% by weight or more of all the filaments are formed with details showing light dyeing, and the deeply dyed portion is formed with 60% by weight or more of all filaments with a thick part showing deep dyeing.

In this case, the lightly dyed portion is made up of details showing a light dyeing property in an amount of less than 80% by weight of the total filaments forming the lightly dyed portion, or the deeply dyed portion forms the deeply dyed portion. When less than 60% by weight of all the filaments are composed of thick portions exhibiting deep dyeing properties, the contrast between the deeply dyed portions and the lightly dyed portions is reduced, and the lightly dyed portions are formed in the deeply dyed portions. The hazy appearance becomes unclear.

The length of the lightly dyed portion is 10 mm to 40 m.
m. When the length of the lightly-colored portion is less than 10 mm, the existence of the lightly-colored portion becomes unclear, and when the length of the lightly-colored portion exceeds 40 mm, the lightly-colored portion becomes too long, resulting in a lustrous appearance. No longer appear.

[0016] In order to obtain an even better brushed appearance, the polyester thick fiber yarn of the present invention requires that the proportion of lightly dyed parts be smaller than the proportion of deeply dyed parts. The ratio between the lightly-stained portion and the deeply-stained portion is represented by a histogram of the deviation from the center value in the yarn spot measurement described below, and a portion having a fineness greater than the center value is defined as a densely-stained portion, and a portion having a smaller fineness than the center value. Is a lightly-stained portion, and the area ratio of the histogram is the ratio between the lightly-stained portion and the deeply-stained portion.

Further, the polyester thick fiber yarn of the present invention needs to have a boiling water shrinkage (BWS) of 3% or less. Normal polyester fine fiber yarn,
The heat shrinkage of the thick portion is high, and when the thick fiber yarn shrinks with boiling water, the thick portion showing deep dyeability shrinks to become thicker and shorter. For this reason, the appearance of the brilliant color of the deeply dyed portion becomes conspicuous. On the other hand, if the boiled water shrinkage of the thick portion is kept low, that is, if the shrinkage of the deeply dyed portion is suppressed, the polyester dye can be obtained in which the lightly dyed portion is present in the deeply dyed portion in a crisp tone. It becomes a fine fiber yarn.

When the boiling water shrinkage (BWS) exceeds 3%, the deeply dyed portion becomes a high shrinkage portion, so that the deeply dyed portion is emphasized in a bumpy manner, and In contrast to the object of the present invention in which the lightly-colored portion presents an appearance in which the light-colored portion is present in a lustrous manner, the appearance of the light and shade is reversed to a lustrous appearance.

Further, the polyester fine fiber yarn of the present invention is
It is necessary that the coefficient of variation CV of the thickness unevenness of the fiber yarn is 1 to 3%. When the coefficient of variation CV is less than 1%,
Although there is a marbling effect due to the light and shade dyeing, the thick part is dispersed and a clear light and shade expression cannot be obtained. On the other hand, if the variation coefficient CV of the thickness unevenness of the fiber yarn exceeds 3%, unnatural unevenness is generated, and high quality is not obtained.

The above coefficient of variation CV of the thickness unevenness was measured using an EVENESTESTER KET-80C manufactured by Keisoku Kogyo Co., Ltd. under the conditions of a yarn speed of 8 m / min and a chart speed of 50 cm / min. And is an index indicating the magnitude of deviation from the average value.

The polyester thick and thin fiber yarn of the present invention having the above-mentioned structure can be further processed into an arbitrary yarn form such as a spun yarn or a false twisted yarn.

When the polyester thin fiber yarn of the present invention is subjected to the post-treatment of the alkali weight reduction treatment, the treatment can be carried out in the form of a thread. After the knitted fabric is formed, it is preferable to perform an alkali weight reduction treatment performed on an ordinary polyester fiber fabric.

The method for producing a polyester fine fiber yarn according to the present invention is a method for producing a polyester thick fiber yarn having the above-mentioned structure, and has a birefringence (Δn) of 30 × 10 ⁻³ or more.
And the entangled portion given by the fluid treatment is 5-2
The polyester unstretched yarn provided at a rate of 0 yarns / m is continuously subjected to a heat drawing treatment with a heat friction resistance pin under conditions satisfying the following formulas and a relaxation heat treatment following the heat drawing treatment. Thereby, a polyester thick fiber yarn is obtained.

MDR × 0.45 ≦ DR ≦ MDR × 0.50 1 ≦ RR ≦ 10 Tg ≦ TP ≦ Tc Tc ≦ THP ≦ Tm [where, in the above formulas, DR is a draw ratio, M
DR is the maximum draw ratio of the undrawn yarn, RR is the relaxation rate (%) in the relaxation heat treatment region, TP is the temperature (° C.) of the frictional resistance pin in the draw region, THP is the relaxation heat treatment temperature (° C.), and Tg is not. The glass transition temperature (° C.) of the drawn yarn, Tc represents the crystallization temperature (° C.) of the undrawn yarn, and Tm represents the melting point (° C.) of the undrawn yarn. ]

When a heat drawing process using a heat friction resistance pin under the above conditions and a subsequent relaxation heat treatment are performed, an undrawn yarn having a birefringence (Δn) of less than 30 × 10 ⁻³ is used as a yarn to be processed. If used, it becomes difficult to obtain a thick part having a low boiling water shrinkage. When the relaxation heat treatment temperature is set to a high temperature for the purpose of reducing the boiling water shrinkage of the thick part,
Since the thick portion is thermally embrittled and the fiber strength of the portion is reduced, the fiber yarn becomes unpractical.

The draw ratio (DR) in the drawing region when performing the heat drawing treatment with the above-mentioned heat friction resistance pin is set to the maximum draw ratio (MDR) of the undrawn yarn. If it is set to be higher than 50 times, the ratio of the lightly dyed portion becomes larger than the ratio of the deeply dyed portion, and it becomes impossible to obtain an appearance in which the lightly dyed portion is present in the intended deeply dyed portion in a crisp tone. Also, this draw ratio (DR)
After setting the ratio of the lightly dyed portion to be smaller than the ratio of the deeply dyed portion, even if the undrawn yarn is supplied as it is and subjected to the heat drawing treatment and the relaxation heat treatment, the intended darkly dyed portion is obtained. It does not become a thick and thin fiber yarn with a large contrast between the fiber and the lightly dyed part.

However, by forming a entangled portion by a fluid treatment such as air in advance on an undrawn yarn as a yarn to be subjected to the above-mentioned heat drawing treatment and relaxation heat treatment, the heat rubbing resistance can be obtained. It is possible to control the generation of a stretch neck which occurs when spot stretching is performed, thereby controlling the frequency and length of details of the stretched portion, and providing a large contrast between the intended deeply dyed portion and the lightly dyed portion. A thick and thin fiber yarn can be obtained. However, if the draw ratio is set to be lower than 0.45 times the maximum draw ratio (MDR) of the undrawn yarn, the desired thick dyeing part and light dyeing part can be obtained. It does not become a thick fiber yarn with high contrast.

The number of entangled portions to be applied to the undrawn yarn for performing the heat drawing treatment and the subsequent relaxation heat treatment is 2 / m.
If it exceeds 0, the appearance after dyeing becomes lively due to the increased frequency of the details consisting of the stretched part and the thick part consisting of the unstretched part. The dyed part does not have a hazy appearance. If the number of entangled portions is less than 5 per m, most of the entangled portions do not become selectively stretched portions, so that fiber yarns having the same thickness as a whole are obtained. The appearance is such that the lightly dyed portion is present in the deeply dyed portion in a lustrous manner.

The interval of the confounding part is ROTHSCHILD MESSINSTRUM
ENTE automatic yarn entanglement tester (Ne
This is a value measured using the edle Pull Tester R-2040) under the trip level tension conditions shown in the following equation. Trip level tension = (D × 0.2) + D / F + vibration width [where D is the denier of the yarn bundle, F is the number of filaments forming the yarn bundle, and the vibration width is D × 0.02. ]

Next, the steps of the method for producing a polyester fine fiber yarn of the present invention will be described with reference to the drawings. FIG. 1 shows an undrawn yarn to be subjected to a heat drawing treatment and a subsequent relaxation heat treatment, that is, an entangled portion having a birefringence (Δn) of 30 × 10 ⁻³ or more and imparted by a fluid treatment. It is the schematic which shows the yarn path | route of the spinning process of obtaining the polyester highly oriented undrawn yarn provided at the rate of -20 / m.

In FIG. 1, after the melt spun yarn 2 spun from the spinning nozzle 1 is cooled and solidified by the cool air from the cooling device 3, an oil agent is applied to the yarn 2 by an oil supply device 4, A predetermined level of entanglement is applied between a pair of take-up rolls composed of a first take-up roll 5 and a second take-up roll 6 by a entanglement imparting device 7 composed of an air entanglement device such as an interlace under a constant tension. By doing so, a polyester highly oriented undrawn yarn 8 having a birefringence (Δn) of 30 × 10 ⁻³ or more and having entangled portions imparted by fluid treatment at a rate of 5 to 20 pieces / m 8 Then, it is wound by a winder 9.

Next, FIG. 2 shows that the above-described highly oriented polyester unoriented yarn is continuously subjected to a heat drawing treatment using a heat friction resistance pin and a relaxation heat treatment subsequent to the heat drawing treatment, so that the desired polyester thin film is obtained. It is the schematic which shows the yarn path | route at the time of obtaining a fiber yarn.

In FIG. 2 described above, the above-described polyester highly oriented undrawn yarn 8 supplied to the yarn supply roll 10 is applied to a heating friction resistance pin 12 provided between the yarn supply roll 10 and the drawing roll 11 by one. While being swirled twice, the polyester highly oriented undrawn yarn 8 is subjected to spot drawing.

Next, the polyester fiber yarn 13 after the spot stretching is subjected to a relaxation heat treatment to obtain a desired polyester fine fiber yarn 14, and then the polyester thick fiber yarn 14 is passed through a winding roll 15. Winding device 1
Wind up with 6. In the illustrated embodiment, a hot plate 17 is provided between the stretching roll 11 and the take-up roll 15, and the hot plate 17 performs a relaxation heat treatment.

Examples of the method for producing a polyester thick fiber yarn of the present invention will be described more specifically. First, 30x
A polyester highly oriented undrawn yarn having a birefringence (Δn) of 10 ⁻³ or more and having entangled portions imparted by a fluid treatment at a rate of 5 to 20 pieces / m, a surface of It is bent and run by the frictional resistance heating pin 12 and is hot stretched by the stretching roll 11 at room temperature.

The surface of the frictional resistance heating pin 12 has a surface roughness of 2 to 30 R as indicated by JIS B0601.
z, preferably a matte surface of 2 to 15 Rz. By using the heating pin 12 forming such a matte surface, each filament that bends and travels by the heating pin 12 has a fine projection on the pin surface. Causes necking stretching due to frictional resistance. On the other hand, when a heating pin having a mirror-finished surface is used, the above-described phenomenon is unlikely to occur.

The matte surface on the surface of the frictional resistance heating pin 12 is:
It is preferably formed of ceramics from the viewpoint of abrasion resistance, but may be formed of a coating layer such as chrome plating. The frictional resistance heating pin only needs to be such that the surface where the fiber yarn is bent and contacted is the above-mentioned matte surface, and for example, any shape such as a bar shape, a roll shape, and a ring shape can be used.

The temperature (TP) of the frictional resistance heating pin 12 is
The higher the temperature, the easier the stretching of the highly oriented undrawn yarn, but the less likely it is for necking to occur. Also, the lower the temperature (TP) of the frictional resistance heating pin 12 is, the more difficult it is to perform stretching itself. From these facts, the temperature (TP) of the frictional resistance heating pin 12 needs to be within the range of the above-described equation, and particularly, the surface temperature of the frictional resistance heating pin 12 is set to 50 to 1
Preferably it is 20 ° C.

Further, the draw ratio (DR) in the hot stretching step is as follows:
As described above, the maximum draw ratio (MDR) of the undrawn yarn is O.D. If the setting is higher than 50 times, the ratio of the lightly dyed portion becomes larger than the ratio of the deeply dyed portion, and the appearance in which the lightly dyed portion is present in the intended deeply dyed portion cannot be obtained. If the maximum draw ratio (MDR) of the drawn yarn is set to be lower than 0.45 times, the intended thick and thin fiber yarn having a large contrast between the deeply dyed portion and the lightly dyed portion will not be obtained.

That is, the draw ratio (DR) in the hot drawing process
Is set higher than 0.50 times the maximum draw ratio (MDR) of the undrawn yarn, necking is unlikely to occur, and uniform drawing may be performed. In addition, the maximum draw ratio (MDR) of the undrawn yarn When it is set to be lower than 0.45 times the necking stretching becomes difficult. Thereby, the draw ratio (DR) in the hot drawing step is MDR × 0.45 ≦ D
It is necessary to set the range of R ≦ MDR × 0.50. Specific stretching ratios (DR) are 1.1 to 1.4.
It is preferred that

The relaxation heat treatment step after the heat drawing is necessary to obtain a polyester thin fiber yarn having a boiling water shrinkage (BWS) of 3% or less, and the temperature (TH) in the relaxation heat treatment step is required.
P) is required to fall within the range of the above equation, and the relaxation rate (%) RR in the relaxation heat treatment step is required to be the above equation. The temperature (THP) in the relaxation heat treatment step is particularly 170
The range of -220 ° C is effective.

By the relaxation heat treatment under such conditions, the fiber structure of the drawn filament can be heat-set, and the heat shrinkage in a post-processing step such as dyeing can be reduced. The relaxation heat treatment step may be performed in a relaxed state by passing through an atmosphere at the above temperature, or may be performed by contacting and traveling with a heating body such as a hot plate 17 as in the embodiment shown in FIG. . According to the latter heating element contact method, heat treatment can be performed efficiently. Further, if the contact length with the heating element is increased by a roll guide or the like, the thermal efficiency can be further improved.

[0043]

EXAMPLES The concrete structure of the polyester thick and thin fiber yarn of the present invention and the method for producing the same will now be described based on production examples. Example 1 According to the spinning process for obtaining a highly oriented undrawn polyester yarn shown in FIG. 1, spinning was carried out using polyethylene terephthalate having an intrinsic viscosity of 0.67 and a melting point of 256 ° C. with a round hole nozzle having 72 holes. Before spinning at a temperature of 290 ° C. at a take-up speed of 2750 m / min and winding it through a pair of take-up rolls, an interlacing entanglement device installed between the pair of take-up rolls is used. Entanglement under the conditions of an air pressure of 3.0 kg / cm ² and an overfeed rate of 1%, 133 dtex, a maximum draw ratio (MDR) of 2.4, and a birefringence (Δn) measured with a polarizing microscope. ) 0.032, a polyester highly oriented undrawn yarn having 12 entanglements per 1 m of the undrawn yarn.

Next, this polyester highly oriented undrawn yarn is subjected to a heat drawing treatment and a relaxation heat treatment under the following conditions according to a heat drawing treatment using a heat friction resistance pin shown in FIG. 2 and a relaxation heat treatment step following the heat drawing treatment. To obtain a polyester fine fiber yarn. Table 1 shows the physical properties of the obtained polyester thick fiber yarn.

Stretching speed = 200 m / min. Stretching ratio (DR) = 1.122 (MDR × 0.46) Temperature of frictional resistance pin (TP) = 60 ° C. Relaxation rate (RR) in heat treatment region = 1.7% Temperature of hot plate for relaxation heat treatment (THP) = 185 ° C. Distance between friction resistance pin and take-off roll = 30 cm

Examples 2 to 4 Spinning was carried out under the same conditions as in Example 1 except that the interlace air pressure and the stretching conditions were partially changed as shown in the predetermined columns of Table 1, and then the stretching was carried out by heating. By performing a relaxation heat treatment, a polyester thick fiber yarn was obtained. Table 1 shows the physical properties of the obtained polyester thick fiber yarn.

[0047]

[Table 1]

Comparative Examples 1 to 3 As shown in a predetermined column of Table 2, an undrawn yarn spun under the same conditions as in Example 1 except that the interlace air pressure was changed, was used in the same manner as in Example 1. The film was stretched under the stretching conditions and subsequently subjected to the same relaxation heat treatment as in Example 1 to obtain a polyester thick fiber yarn for comparison. Table 2 shows the physical properties of the obtained polyester fine fiber yarn.

[0049]

[Table 2]

Comparative Examples 4 to 5 The undrawn yarn obtained in Example 1 was drawn under the drawing conditions shown in the predetermined column of Table 3 and subsequently subjected to the same relaxation heat treatment as in Example 1. A polyester thick fiber yarn for comparison was obtained. Table 3 shows the physical properties of the obtained polyester thick fiber yarn.

Comparative Example 6 The undrawn yarn obtained in Example 1 was drawn under the drawing conditions shown in the predetermined column of Table 3 and then subjected to a non-relaxation heat treatment to obtain a polyester thick fiber yarn. . Table 3 shows the physical properties of the obtained polyester thick fiber yarn.

[0052]

[Table 3]

Experiment Using a polyester multifilament yarn having an elongation of 30%, 55.6 dtex and 18 filaments obtained by subjecting a warp to normal stretching, the polyester yarn obtained in the above Examples and Comparative Examples was used as a weft. Using a fine fiber yarn, a plain woven fabric having a warp density of 75 yarns / inch and a weft density of 67 yarns / inch is manufactured by WJ
L, the plain woven fabric was dyed under the following conditions, and the appearance of light and dark spots of the dyed fabric was visually determined.

Bath ratio = 1: 100 Dye = "Terasil Navy Blue" manufactured by Ciba Geigy Dye concentration = 1.0 wt% Dyeing temperature = 98 ° C Dyeing time = 60 minutes

The results of the judgment are shown in Tables 1 to 3. In addition, the evaluation of shading of the cloth after dyeing was classified into the following six grades and displayed. ◎ ・ ・ ・ ・ ・ ・ ・ ・ very good ○ ・ ・ ・ ・ ・ ・ ・ ・ ・ Good ○ 〜 △ ・ ・ ・ ・ Generally good (frequency of shading is slightly high) △ ・ ・ ・ ・ ・ ・ ・ Permissible It is in the range (the contrast of light and shade is slightly weak).

[0056]

According to the polyester fine fiber yarn of the present invention, a fabric having an appearance in which lightly dyed portions are present in the deeply dyed portion in a lustrous manner can be obtained. Since the shrinkage of boiling water is kept low, the fabric made of the polyester thick fiber yarn has a soft feel.

When the polyester thick and thin fiber yarn of the present invention is made into a mixed yarn with a high shrinkage fiber, the fabric is made of a woven or knitted fabric having a characteristic appearance effect and a soft and swollen feeling.

Further, according to the method for producing a polyester thick fiber yarn of the present invention, it is possible to easily and surely produce a polyester thick fiber yarn having the above-mentioned characteristics at a high rate.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a yarn path in a spinning step of obtaining an undrawn yarn.

FIG. 2 is a schematic view showing a yarn path when an undrawn yarn is subjected to a heat drawing treatment and a relaxation heat treatment following the heat drawing treatment.

[Explanation of symbols]

 1 ··· Spinning nozzle 2 ··· Swelling yarn 3 ··· Cooling device 4 ··· Oil supply device 5 ··· First take-up roll 6 ··· Second take-up roll 7 ··· Entangled portion imparting device 8 ··· Highly oriented polyester unstretched yarn provided with an entangled portion 9 ··· Winding machine 10 ··· Yarn feed roller 11 ··· Stretching roller 12 ··· Heat friction resistance pin 13 ··· Polyester fiber yarn after spot stretching 14 ··· Polyester thick fiber fiber 15 ··· Winding roll 16 ··· Winding device

Claims (2)

[Claims] 1. A polyester thin fiber yarn comprising a multifilament yarn having a thickness in the length direction, wherein the polyester thick fiber yarn comprises 80% of all filaments.
More than 60% by weight of all filaments consist of a thick dyed part which is thick, and the length of the light dyed part is 10 to 40%.
mm, the ratio of lightly dyed portions is smaller than the ratio of darkly dyed portions, the variation coefficient CV of unevenness in thickness is 1 to 3%, and the boiling water shrinkage (BWS) is 3% or less. Characterized polyester thin fiber yarn. 2. A entangled portion having a birefringence (Δn) of 30 × 10 ⁻³ or more and having an entangled portion provided by a fluid treatment, has
The polyester unstretched yarn provided at a rate of 個 / m is continuously subjected to a heat stretching treatment with a heat friction resistance pin under conditions satisfying the following formulas and a relaxation heat treatment following the heat stretching treatment. The method for producing a polyester thick and thin fiber yarn according to claim 1, characterized in that: MDR × 0.45 ≦ DR ≦ MDR × 0.50 1 ≦ RR ≦ 10 Tg ≦ TP ≦ Tc Tc ≦ THP ≦ Tm [However, in the above formulas, DR is a draw ratio, M
DR is the maximum draw ratio of the undrawn yarn, RR is the relaxation rate (%) in the relaxation heat treatment region, TP is the temperature (° C.) of the frictional resistance pin in the draw region, THP is the relaxation heat treatment temperature (° C.), and Tg is not. The glass transition temperature (° C.) of the drawn yarn, Tc represents the crystallization temperature (° C.) of the undrawn yarn, and Tm represents the melting point (° C.) of the undrawn yarn. ]