JPH06200436A - Polyester filament mixed yarn - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a polyester filament-blended yarn which is excellent in bulkiness and is soft and has a new feeling of swelling. [Structure] Spontaneous elongation performance in which the elongation rate during boiling water treatment is 0 to 5%, and when the boiling water treated filament yarn is subsequently dry heat treated at 130 ° C or higher, irreversible elongation of 1 to 4% is recognized. 175 and a highly shrinkable polyester filament having a dry heat shrinkage at 175 ° C. of 14 to 20%.
A polyester filament mixed yarn in which the difference Δ (HAS) in dry heat shrinkage between both polyester filament yarns at 20 ° C. is 20% or more.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester filament mixed filament yarn which provides a woven or knitted fabric having a new texture which is excellent in bulkiness, soft and rich in swelling feeling. More specifically, the present invention relates to a different shrinkage filament mixed fiber yarn in which a polyester filament yarn having a spontaneous stretching performance and a highly shrinkable polyester filament yarn are combined.

[0002]

2. Description of the Related Art Conventionally, as a means for obtaining a woven or knitted fabric rich in bulkiness, a low-shrinkable filament yarn and a high-shrinkable filament yarn are combined into a filament-mixed yarn, and a woven or knitted fabric using this filament-mixed yarn is dyed. It is known that heat treatment in a later step such as finishing causes the bulkiness caused by the difference in shrinkage. A woven or knitted fabric using the different shrinkage filament mixed filament yarn is marketed under the name of "new synthetic fiber" as a filament yarn having a texture exceeding silk.
However, in recent years, consumers are demanding a higher quality texture, that is, a higher swelling feeling and a new texture, and the shrinkage difference between the high-shrinkage component and the low-shrinkage component constituting the filament mixed yarn is increased. Is required to do. As a method of increasing the shrinkage difference, there are a method of increasing the shrinkage rate of the high shrinkage filament yarn and a method of decreasing the shrinkage rate of the low shrinkage filament yarn. Regarding the former, it is effective to increase the addition amount of the copolymerization component, but the resulting polymer has a low crystallization rate and causes fusion between pellets in the drying process, and shrinkage of the woven or knitted fabric in the dyeing and finishing process. There are many problems such as a decrease in yield as a product. In addition, increasing the shrinkage ratio of the highly shrinkable filament yarn causes the entire woven or knitted fabric to shrink, which tends to make the fabric feel harder. On the other hand, as a method for reducing the shrinkage rate of the latter low-shrinkage filament yarn, a filament yarn having a shrinkage rate lower than that of the high-shrinkage component and desirably having the property of extending is required.

As a filament mixed yarn using such a spontaneously extending filament yarn, JP-A-1-25042
No. 5, JP-A-1-250433 discloses a filament comprising a spontaneously stretched filament yarn having a boiling water shrinkage of 0% or more and a dry heat shrinkage of 0% or less, and a filament yarn having a dry heat shrinkage of 0% or more. As a mixed fiber, a filament mixed fiber having a specific degree of entanglement in which the difference in dry heat shrinkage between the two is 5% or more has been proposed.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
No. 5, Japanese Patent Laid-Open No. 1-250433 discloses a filament mixed yarn, which is much softer and softer than that obtained by mixing shrink filament yarns with each other, but spontaneously elongates the filament yarn. Since the projecting loop part due to deteriorates the handleability in the subsequent process, it was necessary to perform a specific entanglement to improve the passability in the subsequent process.

The present invention improves the passability in such a post-process not by the entanglement method but by the characteristics of the spontaneously stretched filament yarn, and moreover, is obtained in the filament mixed yarn using the conventional spontaneously stretched filament yarn. The present invention provides a filament-mixed yarn having a novel texture such as a softer and bulky bulge that has not been achieved.

[0006]

[Means for Solving the Problems] That is, according to the present invention, the elongation percentage during boiling water treatment is 0 to 5%, and when the boiling water treated filament yarn is subsequently subjected to dry heat treatment at 130 ° C. or higher, further 1 to 4%. 1% thick and thin polyester filament yarn with spontaneous elongation performance that shows irreversible elongation of 1%
It is composed of a highly shrinkable polyester filament having a dry heat shrinkage of 14 to 20% at 75 ° C., and a difference in dry heat shrinkage of both polyester filament yarns at 175 ° C. is 20%.
The above is a polyester filament mixed filament yarn characterized by the above.

The present invention will be described in more detail below. The polyester used for the thick and thin polyester filament yarn having the spontaneous stretching property used in the present invention is a polyester whose intrinsic viscosity [η] is in the range of 0.50 to 0.72 and whose main repeating unit is ethylene terephthalate. Is. The cross-sectional shape of the filament yarn according to the present invention may be a round cross section or an irregular cross section.

The thick and thin polyester filament yarn having the spontaneous elongation performance used in the present invention has an elongation rate of 0 to 5% at the time of boiling water treatment, and when mixed with the highly shrinkable polyester filament yarn, it becomes bulky in the dyeing and finishing step. Show. Thick polyester filament yarn with this spontaneous elongation performance,
When the filament yarn is extended by 0 to 5% with boiling water, it becomes a filament yarn with few stains. Further, since the thick portion and the thin portion are thick and thin filament yarns dispersed between the filaments and in the filament yarn longitudinal direction, long-period extension unevenness in spontaneous elongation is reduced, and a more delicate texture is expressed, and It becomes a filament yarn with few stains. When the filament yarn treated with boiling water is subsequently subjected to dry heat treatment at 130 ° C or higher, irreversible elongation of 1 to 4% is further increased,
The filament yarn expresses higher bulkiness. Further, although the reason is unknown, when the spontaneously stretching filament yarn is a thick and thin filament yarn, when the filament-mixed yarn is used, the entanglement with the other highly shrinkable polyester filament yarn becomes very good, Even if no special entangling treatment is carried out, the passability in the subsequent process becomes very good.

The highly shrinkable polyester filament yarn according to the present invention may be a highly shrinkable polyester filament yarn having ethylene terephthalate as a main repeating unit, but it is a modified polyester highly shrinkable filament yarn copolymerized with isophthalic acid. Is more preferable. Such filament-mixed yarn is given a temperature at the time of sizing, for example, a dry heat of 100 ° C. in the preparation stage of weaving. Further, in the dyeing and finishing step after weaving, the treatment temperature of 175 ° C. is applied during the intermediate setting or finishing setting. Therefore,
The higher the temperature, the more it is used for filament mixed yarn 2
Difference in dry heat shrinkage of different types of original filament yarn △ (HAS)
Is preferably large. That is, it is preferable that Δ (HAS) at 175 ° C. be larger than Δ (HAS) at 100 ° C. If the Δ (HAS) at 175 ° C is small, the bulk of the texture after the finishing of the fabric is insufficient and the texture is deteriorated. Therefore, a modified polyester copolymerized with isophthalic acid so that the difference in Δ (HAS) at 175 ° C. becomes large is preferable.

That is, as the highly shrinkable filament yarn for blending the filament blended yarn according to the present invention, 175
It is desirable to use an isophthalic acid copolymerized polyester highly shrinkable filament yarn having a dry heat shrinkage rate of 14 to 20% at a temperature of 7 to 10%.
% Is preferred. In this case, the difference Δ (HAS) in dry heat shrinkage between the highly shrinkable filament yarn and the spontaneously extensible thick and thin filament yarn constituting the filament mixed yarn at the final finishing set temperature of 175 ° C. of the woven or knitted fabric is 20. When it is at least%, a more excellent swelling feeling and a new soft texture can be obtained. Further, it is preferable to show the characteristic that the value of Δ (HAS) increases as the dyeing and finishing step after weaving progresses.

Here, the high shrinkage filament yarn of 175 ° C.
If the dry heat shrinkage ratio at less than 14% is less than 20% of the difference Δ (HAS) in dry heat shrinkage at 175 ° C, the target bulkiness and soft texture can be obtained. I can't.
On the other hand, when the dry heat shrinkage ratio at 175 ° C. exceeds 20%, the fabric shrinkage due to the high shrinkage component is large, and Δ (HA
The bulkiness due to S) is obtained, but the soft feel is not obtained. If the Δ (HAS) at 175 ° C. is less than 20%, the woven or knitted fabric lacks bulkiness and bulge.

The thick and thin filament yarn exhibiting spontaneous elongation used in the present invention can be obtained by the following method. That is, a highly oriented unstretched filament yarn of polyester having a birefringence index Δn in the range of 30 to 70 × 10 ⁻³ is stretched under the conditions of simultaneously satisfying the following formulas, and the thick portion and the thin portion are between filaments and the filament yarn: It can be obtained by making a thick and thin filament yarn dispersed in the longitudinal direction, and subsequently subjecting it to a relaxation heat treatment under conditions satisfying the formula at the same time. DR ₁ = MDR × (0.4 to 0.5)> 1.0 DR ₂ = 1.03 to 1.40 HR ₁ = Tg to (Tg + 20) ° C. HR ₂ <Tc ⁺ RR> 5.0% HP> (HR ₂ +50) ° C. Here, DR ₁ is the draw ratio in the first stage draw zone, and DR ₂ is 2
The draw ratio and MDR in the step drawing zone are preheating temperature 85 to 90 ° C.
HR ₁ is the surface temperature of the take-up roller in the first-stage drawing area, HR ₂ is the surface temperature of the take-up roller in the second-step drawing area, RR is the relaxation rate in the relaxation heat treatment area, H
P is the relaxation temperature in the relaxation heat treatment region, and Tc ⁺ is the crystallization temperature.

The above-mentioned highly oriented undrawn filament yarn is
A filament yarn having a birefringence Δn in the range of 30 to 70 × 10 ⁻³ , and more preferably a birefringence Δn of 4
It is a filament yarn in the range of 0 to 60 × 10 ⁻³ .
The birefringence Δn is a value measured with a polarization microscope for filament filaments with a circular cross section, and the filament yarn with irregular cross sections is calculated by the following relational expression from the value of density measured using a density gradient tube. Value. The relational expression is an expression obtained by an approximation method as a linear expression from the relation between Δn and density (ρ) measured for a filament yarn having a round cross section in which Δn is in the range of 15 to 60 × 10 ⁻³ . Δn = 3.33 × ρ−4.44

When the birefringence Δn is lower than 30 × 10 ^-3 , the boiling water shrinkage of the obtained thick and thin filament yarn is large, and the desired spontaneous elongation property during the boiling water treatment cannot be obtained. The reason for this is not clear, but when a thick filament yarn is formed, the orientation of the unstretched portion, which is the thick portion, is too low, so stabilization of the molecular structure in the oriented amorphous portion due to thermal energy during boiling water treatment results in crystallization. It is considered that the structure changes to an amorphous shape instead, and the filament yarn shrinks as a result.

On the other hand, when Δn is larger than 70 × 10 ^-3 , the maximum draw ratio is low and the draw ratio (D
R ₁ ) becomes 1 or less, and the stretching condition for converting into thick and thin filament yarn cannot be obtained, and it becomes the relaxation heat set filament yarn of the unstretched filament yarn. As a result, the extensibility during dry heat treatment after boiling water treatment is recognized, but there is no spontaneous extensibility during boiling water treatment. In addition, dyeing unevenness due to shrinkage unevenness occurs, resulting in poor dyeing quality.

A highly oriented undrawn filament yarn having a birefringence Δn in the range of 30 to 70 × 10 ^-3 is composed of a room temperature feeding roller and a take-up roller heated to Tg to (Tg + 20) ° C. Stretching is performed between the pair of rollers having a stretching ratio of greater than 1.0 and a stretching ratio set to 40 to 50% of the maximum stretching ratio (MDR) measured at a preheating temperature of 85 to 90 ° C. Results in non-uniform stretching in which the stretching point varies slightly on the take-up roller. As a result, a thick and thin filament yarn in which thick portions and details are dispersed between the filaments and in the longitudinal direction of the filament yarn is obtained.

The thick and thin filament yarn is continuously stretched at a draw ratio of 1.03 to below the crystallization temperature (Tc ⁺ ).
By performing the tension heat treatment such as 1.40, it is possible to increase the orientation of the thick portion that is the unstretched portion while suppressing the progress of crystallization as much as possible, and make it easy to crystallize in the post-treatment process. The thick filament yarn obtained at this stage has structural strain due to stretching remaining in the details of the stretched portion, and has a boiling water shrinkage of 5 to 7% and no spontaneous stretching performance. The thick and fine filament yarn that has been subjected to this tension heat treatment is subsequently subjected to a relaxation heat treatment at a relaxation rate higher than 5.0% and a temperature higher than (the treatment temperature at the time of the tension heat treatment +50) ° C. The thick filament yarn is relaxed and has a spontaneous stretching property such that the boiling water shrinkage rate is 0 to -5% [a negative value represents elongation]. here,
The stretching step and the relaxation heat treatment step may be performed in one continuous step or in two independent steps.

The spontaneously extensible thick and thin filament yarn is subjected to a boiling water treatment and then subjected to a dry heat treatment at 130 ° C. or more, whereby an irreversible elongation of 1 to 4% is recognized. When the stretching is performed under a condition outside the range of the stretching conditions,
Even if the spontaneous elongation performance is not exhibited or the spontaneous elongation performance is recognized, the thick part and the fine particles are not well dispersed, and the dyeing quality in which the stain is generated is inferior. Further, the filament yarn also has a quality problem in terms of spontaneous elongation characteristics, which is uneven in the longitudinal direction of the filament yarn.

No particular limitation is imposed on the fineness, the cross-sectional shape of the filament yarn, the luster, etc. of the filament mixed fiber used here, and the means for mixing, such as aligning, twisting, fluid mixing, etc., can also be used. It doesn't matter.

[0020]

EXAMPLES The present invention will be described in more detail below with reference to examples. The boiling water shrinkage and dry heat shrinkage in the examples and comparative examples were measured by the following methods.

<Boiling water shrinkage rate> 1/3 per 1 denier
A 10-turn winding cassette having a trial length of 1 m is prepared under a tension of 0 g, and a load of 2/3 g per 1 denier is applied to measure the initial cassette length (L ₀ ). After immersing the skein in boiling water for 30 minutes in the unloaded state, the load is applied again to measure the measurement skein length (L ₁ ), which is calculated from the following equation. Boiling water shrinkage = (L ₀ −L ₁ ) / L ₀ × 100%

<Dry heat shrinkage>: The dry heat shrinkage at 180 ° C. was measured by measuring the boiling water shrinkage and then leaving the measured Kasse sample in an ambient temperature of 180 ° C. for 10 minutes under no load. The measurement length (L ₂ ) is measured and calculated by the following formula. Dry heat shrinkage = (L ₀ −L ₂ ) / L ₀ × 100%

Further, the Tg and Tc of the undrawn filament yarn
The value of ⁺ was measured with a differential scanning calorimeter (DSC220 manufactured by Seiko Instruments Inc.).

[Example 1] A spinning temperature of polyethylene terephthalate having an intrinsic viscosity [η] of 0.65 was used by using a spinneret having 72 holes having a diameter of 0.2 mm.
Melt spinning at 0 ° C, winding at 2700 m / min, 12
0d / 72f unstretched filament yarn was produced. The MDR of the obtained undrawn filament yarn is 2.55, Δn =
It was 53 × 10 ⁻³ , Tg = 70 ° C., and Tc ⁺ = 110 ° C. This unstretched filament yarn was stretched and relaxed by heat under the following stretching conditions to produce a thick and thin filament yarn. First stage draw ratio (DR ₁ ) = MDR × 0.41 Second stage draw ratio (DR ₂ ) = 1.10 First stage take-up roller temperature (HR ₁ ) = 82 ° C. Second stage take-up roller temperature (HR ₂ ) = 110 ° C. Relaxation rate = 10%, Relaxation temperature = 190 ° C. The boiling water shrinkage rate of this thick filament yarn is −1.1%, 1
The dry heat shrinkage rate at 80 ° C is -3.4%, and after boiling water treatment,
Subsequent dry heat treatment indicated an elongation of 2.3%. A modified polyester obtained by copolymerizing 8 mol% of isophthalic acid with respect to all acid components was melt-spun at a spinning speed of 2,000 m / min, and the residual elongation after stretching was obtained. 25-28%, BWS is 1
75d / produced under the stretching conditions such that 5 to 20%
Air mixed with 18f highly shrinkable filament yarn, 19
A 0d / 90f filament mixed yarn was produced, a plain woven fabric was prepared, and after weight reduction and dyeing, a dry heat treatment was carried out at 175 ° C. for 1 minute. The high shrinkage filament yarn used is 175 ° C.
The dry heat shrinkage was 20%. Therefore, Δ (HAS) near 175 ° C. was 23.4%. The obtained woven fabric was excellent in bulkiness and had a soft new texture with a rich swelling feeling.

[Examples 2 to 5, Comparative Examples 1 to 4] The Δn of the unstretched filament yarn, the stretching conditions and the relaxation conditions were variously changed, and the copolymerization ratio of the thick and thin filament yarn and isophthalic acid was changed. Then, a high-shrinkable filament yarn having different shrinkage characteristics is mixed to prepare a filament-mixed yarn, and the filament-mixed yarn is used to prepare a woven fabric in the same manner as in Example 1, and the bulkiness and wind thereof are obtained. The result was evaluated. Table 1 shows the production conditions and properties of the filament yarn for the spontaneously stretched filament yarn, Table 2 shows the production conditions for the highly shrinkable filament yarn and the properties of the filament yarn, and Table 3 shows the evaluation results of the woven or knitted fabric using the filament-mixed yarn. .

[0026]

[Table 1]

[0027]

[Table 2]

[0028]

[Table 3]

[0029]

According to the present invention configured as described above, when a thick and thin filament yarn that extends in the dyeing process is combined with a highly shrinkable filament yarn to form a filament mixed yarn, it has excellent bulkiness and softness. Thus, it is possible to provide a woven or knitted fabric with a new texture that is rich in bulge.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Internal reference number FI Technical indication location D03D 15/00 J 7199-3B 15/04 A 7199-3B (72) Inventor Kazuhiro Shiozaki Aichi 2-3 Sanbishi Rayon Co., Ltd., Toyohashi, Toyohashi, Toyohashi City (72) Inventor Junichi Yokoyama 2 Sanyobyo Rayon Co., Ltd., 4-1, Ushikawa-dori, Toyohashi, Aichi Prefecture

Claims (1)

[Claims] 1. The elongation rate during boiling water treatment is 0 to 5%,
When the filament water treated with boiling water is subsequently subjected to dry heat treatment at 130 ° C. or higher, a irreversible elongation of 1 to 4% is recognized, and a thick and thin polyester filament yarn having spontaneous elongation performance and a dry heat shrinkage ratio at 175 ° C. 14 to 20% of highly shrinkable polyester filaments,
A polyester filament mixed yarn, wherein the difference Δ (HAS) in dry heat shrinkage between both polyester filament yarns at 75 ° C. is 20% or more.