JPH09132835A - Composite false twisted yarn with a lightweight feel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a composite false twist yarn having soft touch feeling and excellent in lightweight feeling. SOLUTION: This composite false twist yarn is such a yarn that at least two kinds of filament yarns with mutual yarn stickiness difference are mutually combined at a yarn stickiness, having the following characteristics: (a) the filament yarn(s) with greater stickiness difference consists of hollow filaments with hollow state pulsed along the longer direction; (b) the phase for pulsed state differs between these filaments; and (c) on any section of this composite false twist yarn, there are at least three kinds of hollow filaments differing in shape and hollow rate from one another at an arbitrary cross-section.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightweight false-twisted composite yarn and a method for producing the same, and more specifically, to a hollow filament in which the hollow state is a pulsing state along the longitudinal direction of the filament. including,
TECHNICAL FIELD The present invention relates to a composite false twisted textured yarn having a lightweight feeling and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, hollow fibers have been used to impart various functions such as antistatic property (for example, Japanese Patent Publication No. 60-56802).

Such hollow fibers have a larger apparent diameter than solid fibers of the same denier and therefore have a feeling of coarseness and hardness.
When used for clothing, various high-order processings were required.

However, for example, when false-twisting a hollow fiber, the hollow portion is crushed, and not only the feeling of coarseness and hardness cannot be improved, but also the added function is impaired.

On the other hand, a method is known in which two or more types of filament yarns having different elongations are aligned and entangled, and subsequently false twisted to obtain a two-layer structured yarn which is bulky and has an excellent warm feeling. (For example, Japanese Patent Publication No. 60-11130)
Gazette, Japanese Patent Publication No. 61-19733, etc.).

However, although the above-mentioned two-layer structure yarn is excellent in bulkiness, it has a large weight-bearing feeling, and has a light-weight feeling while having a soft texture. The reality is that a composite false twisted yarn cannot be obtained.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a composite false twisted textured yarn which solves the above-mentioned drawbacks of the prior art, has a soft texture and is excellent in a lightweight feeling, and a method for producing the same. Especially.

[0008]

Means for Solving the Problems As a result of intensive studies for solving the above problems, the present inventors have found that, of at least two types of filament yarns having different elongations, the filament yarn having the larger elongation is hollow. When using a filament and false twisting the composite filament under specific conditions, it was clarified that the hollow state was pulsed to obtain a desired composite false twisted yarn.

Thus, according to the present invention, (1) a composite false twisted yarn in which at least two kinds of filament yarns having a foot difference are compounded with a foot difference between the yarns; The filament yarn having the larger difference is composed of hollow filaments in which the hollow state is pulsed along their longitudinal direction, and (b) the phases of the pulsing state are different between the filaments, while (c) In any cross section of the composite false twisted yarn, at least three kinds of hollow filaments selected from hollow filament yarns each having the following cross sections are mixed, and the composite false twisted yarn has a light feeling. Yarn Cross section in which the cross-sectional shape before the false twisting process and the hollow ratio are substantially maintained The cross-sectional shape before the false twisting process is maintained, while the hollow ratio is increased Cross-section due to the false twisting process And the hollow ratio is a cross section that is increased from that before false twisting. The hollow ratio is flattened by false twisting, and the hollow ratio is a cross section that is decreased from that before false twisting. (2) Hollow filament yarn having a hollow ratio of 20% or more as a filament yarn having a high elongation when an intermediate cross section and (2) two or more kinds of synthetic fiber filament yarns having different elongations are aligned and drawn and false twisted. A low-stretching ratio, low-temperature stretching false twisting process under the following false twisting conditions (a) to (c), and then heat-treating at a temperature of 150 ° C. or higher. Method for producing twisted yarn (a) A difference in elongation between two or more kinds of synthetic fiber filament yarns having different elongations is set to 300% or more. (B) The draw ratio is 1.3 or less. (C) The yarn temperature immediately after the exit of the false-twist heat-setting heater is maintained at 70 to 100 ° C. Is provided.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described with reference to the accompanying drawings.
This will be described in detail.

FIG. 1 (a) is a side view showing a crimped state of a composite false twisted yarn of the present invention, and FIG. 1 (b) is a conventional composite false twisted yarn, and FIG. 2 is a composite false twisted yarn of the present invention. It is a cross-sectional view of twisted yarn.

FIG. 3 is a side view showing an example of a manufacturing apparatus for manufacturing the composite false twisted textured yarn of the present invention.

In FIG. 3, a low elongation filament (1)
And the hollow filaments (2) having a higher elongation than (1) are aligned and supplied from a pair of supply rollers (5),
After being entangled with each other by the air entanglement nozzle (6), they are sent to the first heater (8) and the false twisting tool (9) through the intermediate roller (7), and twisted, heat set and untwisted.

Further, the false twisted composite processed yarn is subsequently passed through a delivery roller (10) and then heat treated by a second heater (11), and a take-up roller (12) causes a winder (13) to produce cheese ( It is wound up as 14).

At this time, the elongation difference between the low-elongation filament (1) and the high-elongation hollow filament (2) needs to be 300% or more, and the elongation of the low-elongation filament is 5
It is preferred to use 0-100% solid polyester filament.

The hollow ratio of the hollow filament is 20%.
When the hollow ratio is less than 20%, the pulsing of the filament in the hollow state in the longitudinal direction does not sufficiently occur. However, if the hollow ratio is too large, fibrils are likely to be generated and the weavability is deteriorated. Therefore, it is preferable that the hollow ratio is at most about 50%.

The hollow filament can be produced by a conventionally known method, and among them, polyester hollow filament is preferable.

In the false twisting process, the draw ratio is 1.
3 or less, and the yarn temperature at the exit of the false twist heat fixing heater is 7
It is necessary to set the temperature to 0 to 100 ° C.

If the draw ratio exceeds 1.3, fluff occurs frequently, the workability is lowered, and the quality of the woven fabric is lowered. However, if the stretching ratio is too low, dyeing unevenness will occur, so it is preferable to stop the stretching ratio to at most about 1.1 times.

When the yarn temperature at the exit of the false-setting heat-fixing heater is less than 70 ° C., the twisting tension becomes too high, which causes dyeing unevenness and unevenness. On the other hand, the yarn temperature is 10
If it exceeds 0 ° C., the crimping rate becomes too high, and the resulting woven fabric exhibits a fluffy texture.

The yarn temperature at the exit of the false twist heat-fixing heater is set to 70.
~ 100 ℃, heater temperature 90 ~ 130 ℃
And heating may be performed for 0.15 to 0.23 seconds.

The heat treatment with the second heater (11) may be carried out under the conditions such that the obtained composite false twisted yarn has a boiling water shrinkage of 5 to 15%, and when false twisted under the above conditions. A temperature of 150 ° C or higher is required.

However, if the temperature is too high, fusion between filaments may occur, so at most 200
It is preferable to stop at about C.

As shown in FIG. 1 (a), the false-twisted and heat-treated composite false-twisted yarns under the above conditions have portions M and M'having fine windings in a substantially straight filament.
Are present, and the hollow state of each hollow filament is pulsing while the phases thereof are different from each other. Therefore, as shown in FIG. At least three kinds of hollow filaments selected from the hollow filament yarns are mixed and have a completely new texture and an excellent lightweight feeling different from the conventional composite false twisted yarn shown in FIG. 1 (b). Show. Cross-sectional shape before false twisting and cross-section where the hollow ratio is substantially maintained The cross-sectional shape before false-twisting is maintained, while the hollow ratio is increased Cross-section is flattened by false-twisting, and the hollow ratio is Cross-section increased from that before twisting Flattened by false-twisting and the hollow ratio was reduced from that before false-twisting Intermediate cross-section between cross-sectional shape before false-twisting and flat cross-section

That is, in the above false twisting step, the high elongation hollow filament (2) is easily stretched, while the low elongation filament (1) is difficult to elongate. The hollow filament (2) is wound around, and the hollow filament (2) is stretched by the length required for winding.

Since the hollow filament (2) is stretched while being twisted, air existing in the hollow portion is pushed out in the longitudinal direction of the filament, and the hollow portions have a hollow ratio of 20 to 80% with respect to each other. This is a pulsing state in which fluctuations are repeated while changing the phase.

At this time, the maximum hollow ratio of the hollow filament is preferably in the range of 1.5 to 2.5 times the hollow ratio before false twisting.

If the magnification is less than 1.5 times, sufficient pulsing does not occur and an excellent lightweight feeling may not be obtained. On the other hand, if the magnification exceeds 2.5 times,
The hollow ratio may become too large, fibrils may be easily generated, and the weaving property may be deteriorated.

In the composite false twisted yarn, the difference between the core yarn and the sheath yarn is preferably 30 to 50%.

When the difference in the staple length is less than 30%, the composite false twisted yarn does not have a two-layer structure, the collapse of the hollow portion becomes large, and the pulsing state may not be exhibited. On the other hand, when the difference in thread length is more than 50%, it becomes difficult to uniformly stretch the fibers, which may cause defects such as stains and streaks.

[0031]

The present invention will be described in more detail with reference to the following examples. The nuclear physical properties in the examples were measured by the following methods.

(1) Thread difference 50 cm of the composite bulky processed thread is taken out and 0.2 g is applied to one end of the thread.
/ Suspend a denier load. Next, 5 in the middle of the thread
Mark one place at cm intervals and cut out this part to make a sample.

From the sample, 10 hollow filament yarns in the sheath and 10 filaments in the core were taken out, respectively.
The load is suspended in g / denier and the length is measured.

When the average lengths of the filament of the sheath portion and the filament of the core portion are l _A and l _B , respectively, the thread difference is expressed by the following equation. Thread difference (%) = (l _B -l _A ) / l _A × 100 The measurement was performed 10 times, and the average value was shown.

(2) Shrinkage of boiling water A skein of a composite false twisted yarn having a denier of about 3000 was made, and a load of 0.1 g / de was applied to the skein to read the original length l ₀ (cm).

Next, the load of the skein was changed to 2 mg / de, this was heat-treated in boiling water for 30 minutes and dried at room temperature, then the load was changed to 0.1 g / de and its length l ₁ (c
I read m).

The boiling water shrinkage ratio BWS (%) is expressed by the following equation. Boiling water shrinkage BWS (%) = (l ₀ −l ₁ ) / l ₀ × 10
0 The measurement was performed 10 times and the average value was shown.

(3) Cross-sectional Shape of Hollow Filament in Arbitrary Cross Section of Composite False Twisted Yarn A cross-sectional micrograph of the composite false twisted yarn (magnification 500 times) is shown.
The cross-sectional shape of the hollow filament was observed by arbitrarily photographing 20 locations.

(4) Hollowness of Hollow Filament In the above cross-sectional photograph, the hollowness of all the hollow filaments was measured, and this was set as the range of the hollowness of the hollow filaments. The largest value among them was the maximum hollow ratio.

(5) Texture and lightness of the composite false-twisted yarn The obtained composite false-twisted yarn is knitted by a cylinder knitting machine, and the wind of the knitted fabric after scouring, dyeing and final setting according to a conventional method. The sensory evaluation was made by five skilled persons for the feeling (softness) and the feeling of lightness (weight).

The judgment is 5 from 1 (bad) to 5 (very good).
Expressed in stages.

Example 1 First, a polyethylene terephthalate polymer was melted and discharged from a hollow fiber spinning die and spun at a spinning speed of 1300 m / min to give a hollow ratio of 40.
%, Elongation 380%, 85 denier / 12 filament high elongation hollow filament yarn was obtained.

Next, after the polyethylene terephthalate polymer was melted and discharged by a conventional method, the spinning speed was 5000 m.
/ Min. To give a low-elongation solid filament yarn having an elongation of 60% and 75 denier / 12 filaments.

Then, both filament yarns were supplied to the false twisting apparatus shown in FIG. 3 and guided and entangled in an air entanglement nozzle under the conditions of an overfeed rate of 4% and a pneumatic pressure of 4 kg / cm ² .

Subsequently, both filaments were heated to 105 ° C.
Heat was set for 0.17 seconds with the first heater set to 1., the yarn temperature at the heater outlet was set to 90 ° C., and the yarn was introduced into a triaxial friction false twisting device rotating at a surface speed of 630 m / min. Stretching false twisting was performed under the conditions of 25 times and a processing speed of 350 m / min.

Further, the above composite false-twisted yarn was introduced into a second heater at 200 ° C. with an overfeed rate of 0% and subjected to a heat treatment, and then wound on a winder, 130 denier / 24 filament, and a boiling water shrinkage rate of 9%. A composite false twisted yarn of was obtained.

The obtained composite false twisted yarn has a two-layer structure in which a hollow sheath yarn is wound around a solid core yarn,
The difference in thread length between the core yarn and the sheath yarn was 41%.

Further, when the cross-sectional shape of the hollow filament in an arbitrary cross section of the composite false twisted yarn was observed, as shown in FIG. 2, hollow filament yarns each having the following cross sections were mixed and the hollow filament yarn was hollow. The state was pulsing while having a phase difference. Cross-sectional shape before false twisting and cross-section where the hollow ratio is substantially maintained The cross-sectional shape before false-twisting is maintained, while the hollow ratio is increased Cross-section is flattened by false-twisting, and the hollow ratio is Cross-section increased from that before twisting Flattened by false-twisting and the hollow ratio was reduced from that before false-twisting Intermediate cross-section between cross-sectional shape before false-twisting and flat cross-section The hollowness of the filament was in the range of 40 to 70%.

Next, the composite false-twisted yarn was knitted by a tubular knitting machine, and the texture (softness) and lightness (weight) of the dyed and finished knitted fabric were measured according to a conventional method.
It had a very soft texture and had a light feeling.

Further, the knitted fabric was dyed in an extremely dark color as compared with the ordinary false twisted yarn.

[Examples 2-3, Comparative Examples 1-2] Example 1
In the same manner as in Example 1, except that the false twisting conditions were changed as shown in Table 1. Table 1 shows the physical properties of the obtained composite false twisted yarn and knitted fabric.

[0052]

[Table 1]

[Example 4, Comparative Examples 3 to 4] The same as Example 1 except that the hollow ratio and the elongation of the hollow filament and the elongation of the solid filament were changed as shown in Table 2. It was carried out. Table 2 shows the physical properties of the obtained composite false twisted yarn and knitted fabric.

[0054]

[Table 2]

[0055]

EFFECT OF THE INVENTION According to the present invention, a deep dyeing polyester composite false twisted yarn having a soft and novel texture and an excellent lightweight feeling can be obtained. It can be suitably used for black formal applications such as.

[Brief description of the drawings]

FIG. 1 (a) is a composite false twisted yarn of the present invention,
FIG. 1B is a side view showing an example of a crimped state of a conventional composite false twisted yarn.

FIG. 2 is a cross-sectional view showing an example of a composite false twisted yarn of the present invention.

FIG. 3 is a side view showing an example of a production apparatus for producing the composite false twisted yarn of the present invention.

[Explanation of symbols] 1 low elongation filament 2 high elongation hollow filament 3 guide 4 tension adjusting device 5 supply roller 6 air entanglement nozzle 7 intermediate roller 8 first heater (9 false twisting tool 10 delivery roller 11 second heater 12 take-up roller 13 winder 14 cheese

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location D06B 1/04 D06B 1/04

Claims (13)

[Claims] 1. A compound false twisted yarn in which at least two kinds of filament yarns having a difference in the staple length are compounded with a difference in the staple distance between the yarns, and (a) the filament yarn having a larger difference in the staple distance is , Composed of hollow filaments whose hollow state is pulsed along their longitudinal direction, and
(B) The phase of the pulsing state is different between the filaments, while (c) at least any of the cross-sections of the false-twisted composite yarn selected from hollow filament yarns having the following cross sections A composite false twisted yarn having a lightweight feeling, which is characterized in that three types of hollow filaments are mixed. Cross-sectional shape before false twisting and cross-section where the hollow ratio is substantially maintained The cross-sectional shape before false-twisting is maintained, while the hollow ratio is increased Cross-section is flattened by false-twisting, and the hollow ratio is Cross-section increased from that before twisting Flattened by false-twisting and the hollow ratio was reduced from that before false-twisting Intermediate cross-section between cross-sectional shape before false-twisting and flat cross-section 2. The composite false twisted textured yarn having a lightweight feeling according to claim 1, wherein the difference in the staple length is in the range of 30 to 50%. 3. The lightweight feeling according to claim 1, wherein the pulsing in a hollow state is a state in which at least three kinds of cross-sectional portions selected from the group of cross-sections according to claim 1 continuously exist. Composite false twisted yarn having. 4. The composite false twisted yarn having a light feeling according to claim 1, 2 or 3, wherein the composite false twisted yarn is a two-layer structured yarn having a core-sheath structure. 5. The lightweight false twisted composite yarn according to claim 4, wherein the hollow filament yarn is present as a sheath yarn. 6. The composite false twisted yarn having a lightweight feeling according to claim 5, wherein the hollow filament existing as a sheath yarn has a hollow ratio in a range of 20 to 80%. 7. A composite having a lightweight feeling according to claim 5 or 6, wherein the maximum hollow ratio of the hollow filaments present as the sheath yarn is in the range of 1.5 to 2.5 times the hollow ratio before false twisting. False twisted yarn. 8. The composite false twisted yarn having a lightweight feeling according to claim 4, wherein the core yarn is a solid yarn. 9. The composite false twisted yarn having a lightweight feeling according to claim 4, wherein an entangled portion is present between the core yarn and the sheath yarn. 10. The composite false twisted textured yarn having a lightweight feeling according to claim 9, wherein the entangled portion is interfacial entangled. 11. The lightweight false twisted composite yarn according to claim 4, wherein both the core yarn and the sheath yarn are polyester filaments. 12. A hollow filament yarn having a hollowness of 20% or more is used as a filament yarn having a high elongation when two or more kinds of synthetic fiber filament yarns having different elongations are aligned and drawn for false twisting. Below (a)
(C) A method for producing a composite false twisted yarn having a lightweight feeling, which comprises performing low draw ratio, low temperature draw false twisting under the false twisting condition, and then heat treating at a temperature of 150 ° C. or higher. (A) An elongation difference between two or more kinds of synthetic fiber filament yarns having different elongations is set to 300% or more. (B) The draw ratio is 1.3 or less. (C) The yarn temperature immediately after the exit of the false-twist heat-setting heater is maintained at 70 to 100 ° C. 13. The method for producing a composite false twisted textured yarn having a lightweight feeling according to claim 12, wherein both filament yarns of two or more kinds of synthetic fibers having different elongations are polyester filaments.